JP2000292238A - Detecting apparatus for abnormality of supply pressure of gas and electronic gas meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widely detect not only the abnormality, of the supply pressure of a gas, caused by the pressure regulation defect of a pressure regulator but also the abnormality of the supply pressure of a pressure-regulated gas in a gla flow passage. SOLUTION: This apparatus which detects the abnormality of the supply pressure of a pressure-regulated gas in a gas flow passage 3 is provided with a pressure measuring means PS which measures the pressure of the gas in the gas flow passage 3. The apparatus is provided with a pressure-change judgment means 11A by which thether the supply pressure of the gas in the gas flow passage 3 is changed periodically or not is judged on the basis of a change with the passage of time in the measured result of the pressure measuring means PS in a state that the gas passes the gas flow passage 3. The apparatus is provided with a supply-abnormality judgment means 11B by which whether the supply pressure of the gas in the gas flow passage 3 is abnormal or not is judged on the basis of the measured result of the pressure measuring means PS in a state that the supply pressure of the gas in the gas flow passage 3 is judged to be periodically changed by the pressure-change judgment means 11A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas supply pressure abnormality detecting device for detecting an abnormal supply pressure of a regulated gas in a gas flow path, and a flow rate of the regulated gas in the gas flow path. The present invention relates to an electronic gas meter that measures, integrates, obtains an integrated flow rate, and displays the integrated flow rate.

[0002]

2. Description of the Related Art Conventionally, in a gas supply facility, a gas pressure from a gas supply source such as a gas container (in the case of LP gas) is adjusted to an appropriate supply pressure suitable for consumption by a gas consumption source such as a home. A pressure regulator for regulating the pressure is used, and a gas meter for measuring and displaying an integrated flow rate of the used gas is provided downstream of the pressure regulator.

There are various types of gas meters described above, such as an impeller type. Particularly, in recent years, with the progress of technology, an electric flow sensor such as an ultrasonic sensor or a flow sensor is used, and a microcomputer is used. Equipped with electronically measuring and displaying the integrated flow rate of gas,
What is called an electronic gas meter is widely used.

In the electronic gas meter described above,
In order to make the best use of the installed microcomputer, the pressure of the gas is measured by a pressure sensor on the internal gas flow path, and the measured pressure value is taken into the microcomputer, and the range of the normal gas supply pressure In some cases, a warning indicating an insufficient supply pressure is output under the control of a microcomputer when the power supply deviates from the range.

In the gas supply equipment abnormality detecting device disclosed in Japanese Patent Publication No. 7-43124, which is a representative of this type of gas meter, the flow of gas inside the gas meter reaches a certain amount and the output of the flow sensor exceeds a certain level. If the output of the pressure sensor is out of the range of the normal gas supply pressure in the event that the gas supply pressure is out of range, an alarm indicating that the gas supply pressure is abnormal is output to the management center via a telephone line or the like. I have.

According to the above-mentioned conventional electronic gas meter, when the gas supply pressure is not properly adjusted by the pressure regulator, the gas is consumed by the gas consuming source, so that an unexpected combustion due to incomplete combustion is caused. Since the occurrence of a situation can be prevented beforehand, it can be said that this is extremely excellent in terms of ensuring safety.

[0007]

However, in the above-mentioned conventional electronic gas meter, the gas supply pressure measured by the pressure sensor is normally normal as long as the gas supply pressure is normally adjusted by the pressure regulator. Because it falls within the range, if the gas supply pressure fluctuates for some reason between the gas meter and the gas consumption source, it cannot be detected, and safety is prevented by preventing the occurrence of unexpected situations due to incomplete combustion. In terms of security, there was room for further improvement.

[0008] In view of the above circumstances, the present invention, when the gas supply pressure fluctuates for some reason between the gas meter and the gas consuming source, causes the gas consumption in the gas meter as the gas consuming source consumes the gas. The fact that it is known experimentally and empirically that the pressure and flow velocity of the gas fluctuate periodically is known. The purpose of the present invention is to provide a gas supply pressure caused by poor pressure regulation of a pressure regulator. It is an object of the present invention to provide a gas supply pressure abnormality detection device and an electronic gas meter that can detect not only an abnormality but also an abnormality in the supply pressure of a regulated gas in a gas flow path.

[0009]

The present invention described in each of claims 1 to 18 which achieves the above objects relates to a gas supply pressure abnormality detecting apparatus, and claims 19 to 23.
The present invention described in each of the above items relates to an electronic gas meter.

The gas supply pressure abnormality detecting device according to the present invention detects an abnormality in the supply pressure of the regulated gas in the gas passage 3 as shown in the basic configuration diagram of FIG. A pressure measuring means PS for measuring a gas pressure in the gas flow path 3; and a pressure measuring means PS in a state where there is a gas passing through the gas flow path 3.
Pressure fluctuation determining means 11A for determining whether or not there is a periodic fluctuation in the pressure of the gas in the gas flow path 3 based on the temporal change of the measurement result of In the state where the pressure fluctuation determining means 11A determines that there is a periodic fluctuation in the gas supply pressure of the gas in the gas flow path 3 based on the measurement result of the pressure measuring means PS, Supply pressure abnormality determining means 11B for determining whether or not the pressure is abnormal.

Further, the gas supply pressure abnormality detecting device according to the present invention described in claim 2 is the gas supply pressure abnormality detecting device according to claim 1, wherein the supply pressure abnormality determining means 11 B comprises When the difference between the maximum value and the minimum value of the periodic fluctuation of the pressure of the gas in the gas flow path 3 which is determined to have the fluctuation determining means 11A exceeds a predetermined pressure fluctuation threshold, the gas flow It is determined that the supply pressure of the gas in the passage 3 is abnormal.

Furthermore, the gas supply pressure abnormality detecting device according to the present invention described in claim 3 is the gas supply pressure abnormality detecting device according to claim 1 or 2, wherein the supply pressure abnormality determining means 11 B comprises: The pressure measurement means PS in a state where there is a gas passing through the gas flow path 3, from which the pressure fluctuation determination means 11A determines that the pressure of the gas in the gas flow path 3 has a periodic fluctuation. In a state where the representative pressure value determined from the plurality of measurement results is below the abnormality determination pressure value that is equal to or more than the lower limit value of the normal range of the supply pressure, the supply pressure of the gas in the gas flow path 3 becomes abnormal. It is determined whether or not there is.

According to a fourth aspect of the present invention, there is provided the gas supply pressure abnormality detecting device according to the third aspect of the present invention, wherein the representative pressure value corresponds to the gas flow path. A plurality of measurement results of the pressure measuring means PS in a state where there is a gas passing through the gas flow path 3, which is a basis for the pressure fluctuation determining means 11A to determine that there is a periodic variation in the pressure of the gas in the chamber. Was the average value.

Further, according to a fifth aspect of the present invention, there is provided the gas supply pressure abnormality detecting device according to the third aspect of the present invention, wherein the representative pressure value corresponds to the gas flow path. A plurality of measurement results of the pressure measuring means PS in a state where there is a gas passing through the gas flow path 3, which is a basis for the pressure fluctuation determining means 11A to determine that there is a periodic variation in the pressure of the gas in the chamber. Is the maximum value.

According to a sixth aspect of the present invention, there is provided the gas supply pressure abnormality detecting apparatus according to the first, second, third, fourth, or fifth aspect. Flow velocity measuring means VS for measuring the flow velocity of gas in the road 3
And the time-dependent change of the measurement result of the flow velocity measuring means VS,
Gas flow generation determining means 11C for detecting generation of a gas flow in the gas flow path 3; and the pressure fluctuation determining means 11A detects generation of a gas flow in the gas flow path 3 by the gas flow. As the occurrence determining means 11C detects,
Assuming that there is gas passing through the gas flow path 3, it is determined whether or not there is a periodic fluctuation in the pressure of the gas in the gas flow path 3.

Further, the gas supply pressure abnormality detecting device according to the present invention described in claim 7 is the gas supply pressure abnormality detecting device according to claim 6, wherein the detection result of the gas flow generation determining means 11 C is obtained. Accordingly, the gas flow path 3 further includes a pressure measurement cycle setting means 11D for setting a measurement cycle for measuring the gas pressure in the gas flow path 3 by the pressure measurement means PS. The generation of the gas flow in 3 is determined by the gas flow generation determining means 11.
The measurement cycle is shortened as C is detected.

Further, the gas supply pressure abnormality detecting device according to the present invention described in claim 8 has a basic structure as shown in FIG.
A flow rate measuring means for measuring a flow rate of a gas passing through said gas flow path; a flow rate measuring means for measuring a flow rate of a gas passing through said gas flow path;
The gas passage determination means 11E which determines the presence or absence of a gas passing through the gas flow path 3 based on the time-dependent change of the measurement result of In the determination state, the gas flow path 3 is determined based on the time-dependent change in the measurement result of the flow velocity measuring means VS.
Flow rate fluctuation determining means 11F for determining whether or not there is a periodic variation in the flow velocity of the gas passing through the gas flow path; In the state where 11F has determined, the supply pressure abnormality determination means 11G which determines whether or not there is an abnormality in the gas supply pressure in the gas flow path 3 based on the measurement result of the flow velocity measurement means VS. It is characterized by having.

Further, in the gas supply pressure abnormality detecting device according to the present invention described in claim 9, the gas supply pressure abnormality detecting device according to the present invention is configured such that the supply pressure abnormality determining means 11G includes When the difference between the maximum value and the minimum value of the periodic variation of the flow velocity of the gas passing through the gas flow path 3 which is determined to have the variation determination means 11F exceeds a predetermined flow velocity variation threshold, It was determined that the gas supply pressure in the flow path 3 was abnormal.

According to a tenth aspect of the present invention, there is provided a gas supply pressure abnormality detecting device according to the eighth or ninth aspect, wherein the supply pressure abnormality determining means 11G comprises: The flow velocity measuring means VS in a state where there is a gas passing through the gas flow path 3 has been used as a basis for the flow velocity fluctuation determining means 11F to determine that the flow velocity of the gas flowing through the gas flow path 3 has a periodic fluctuation. In a state where the representative flow rate value determined from the plurality of measurement results is lower than the predetermined abnormality determination flow rate value, it is determined whether or not the gas supply pressure in the gas flow path 3 is abnormal. And

Further, the gas supply pressure abnormality detecting device according to the present invention described in claim 11 is the gas supply pressure abnormality detecting device according to claim 10, wherein the representative flow velocity value is the gas flow path 3. A plurality of measurements of the flow velocity measuring means VS in a state where there is a gas passing through the gas flow path 3, based on which the flow velocity fluctuation determining means 11F determines that there is a periodic variation in the flow velocity of the gas passing therethrough. It was assumed to be the average of the results.

According to a twelfth aspect of the present invention, there is provided the gas supply pressure abnormality detecting device according to the tenth aspect, wherein the representative flow velocity value is:
The flow rate measuring means in a state where there is a gas passing through the gas flow path 3, based on which the flow rate fluctuation determining means 11 F determines that there is a periodic change in the flow velocity of the gas passing through the gas flow path 3. VS was the maximum value of a plurality of measurement results.

Further, the gas supply pressure abnormality detecting device according to the present invention described in claim 13 is the gas supply pressure abnormality detecting device according to claim 8, 9, 10, 11 or 12. Pressure measuring means PS for measuring the pressure of gas in the passage 3, and a gas flow generation determination for detecting generation of a gas flow in the gas flow path 3 based on a temporal change in the measurement result of the pressure measuring means PS And means 11H.
As the flow velocity fluctuation determining means 11F detects the generation of the gas flow in the gas flow path 3 by the gas flow generation determining means 11H, there is a gas passing through the gas flow path 3. It is determined whether or not there is a periodic variation in the flow velocity of the gas passing through the gas flow path 3.

According to a fourteenth aspect of the present invention, there is provided the gas supply pressure abnormality detecting device according to the thirteenth aspect of the present invention, wherein the gas flow generation judging means 11H includes a detection result. Accordingly, the apparatus further includes a flow rate measurement cycle setting means 11J for setting a measurement cycle for measuring the flow rate of the gas passing through the gas flow path 3 by the flow rate measurement means VS. The generation of the gas flow in the passage 3 is determined by the gas flow generation determining means 1.
According to the detection of 1H, the measurement cycle is shortened.

Further, the gas supply pressure abnormality detecting device according to the present invention described in claim 15 is the gas supply pressure abnormality detecting device according to claim 13 or 14, wherein the supply pressure abnormality determining means 11G comprises: In a state where the gas pressure in the gas flow path 3 measured by the pressure measuring means PS is lower than an abnormal determination pressure value equal to or higher than a lower limit value of the normal range of the supply pressure, the gas flow in the gas flow path 3 is reduced. It is determined whether or not the gas supply pressure is abnormal.

Further, the gas supply pressure abnormality detecting device according to the present invention as described in claim 16 is, as shown in FIGS. 1 and 2, claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1
In the gas supply pressure abnormality detecting device according to the present invention described in 1, 12, 13, 14 or 15, when the supply pressure of the gas in the gas flow path 3 is abnormal, the supply pressure abnormality determination means 11
B, 11G, an abnormality determination number counting means 11M for counting the number of determinations, and when the number counted by the abnormality determination number counting means 11M reaches a predetermined notification execution number, the gas in the gas flow path 3 is determined. A report data generating and outputting means 11N for generating and outputting report data for transmitting to the remote monitoring host computer via the telephone line that the supply pressure is abnormal is further provided.

Further, in the gas supply pressure abnormality detecting device according to the present invention described in claim 17, in the gas supply pressure abnormality detecting device according to the present invention, the abnormality determination number counting means 11M includes the gas detection device. The number of times that the supply pressure abnormality determining means 11B and 11G successively determine that the supply pressure of the gas in the flow path 3 is abnormal is counted.

The gas supply pressure abnormality detecting device according to the present invention described in claim 18 is the gas supply pressure abnormality detecting device according to claim 16 or 17, wherein the abnormality determination number counting means 11M comprises: If there is an abnormality in the supply pressure of the gas in the gas passage 3, the supply pressure abnormality determining means 11B, 1
The number of times determined by 1G was counted over the latest certain number of days in the past.

Further, the electronic gas meter according to the present invention described in claim 19 has a gas supply pressure according to claim 1, 2, 3, 4 or 5 as shown in FIG. An electronic gas meter with a built-in abnormality detection device,
A flow velocity measuring means VS for measuring the flow velocity of the gas in the gas flow path 3, and a passage for measuring the flow rate of the gas passing through the gas flow path 3 based on the change over time of the measurement result of the flow velocity measuring means VS. A flow rate measuring means 11K, an integrated flow rate measuring means 11L for measuring an integrated flow rate of the gas passing through the gas flow path 3 based on a measurement result of the passing flow rate measuring means 11K, and a measurement result of the integrated flow rate measuring means 11L And a display means 15 for displaying.

The electronic gas meter according to the present invention as described in claim 20, as shown in the basic configuration diagram in FIG. 4, according to claim 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15. An electronic gas meter incorporating the gas supply pressure abnormality detecting device according to the present invention described in 15 above, wherein the flow rate measuring means VS
Flow rate measuring means 11K for measuring the flow rate of the gas passing through the gas flow path 3 based on the temporal change of the measurement result
And an integrated flow rate measuring means 11L for measuring the integrated flow rate of the gas passing through the gas flow path 3 based on the measurement result of the passing flow rate measuring means 11K, and a display for displaying the measurement result of the integrated flow rate measuring means 11L. And means 15.

The electronic gas meter according to the present invention described in claim 21 is, as shown in FIGS. 3 and 4, the electronic gas meter according to claim 19 or 20 according to the present invention. An abnormality determination number counting means 11M for counting the number of times the supply pressure abnormality determination means 11B and 11G determine that there is an abnormality in the supply pressure of the gas in the chamber; When the number of times of execution has been reached, report data generation output for generating and outputting report data for sending to the remote monitoring host computer via the telephone line that the gas supply pressure in the gas flow path 3 is abnormal. Means 11N.

The electronic gas meter of the present invention described in claim 22 is the electronic gas meter of the present invention described in claim 21, wherein the abnormality determination number counting means 11M
However, the number of times that the supply pressure abnormality determining means 11B and 11G continuously determine that the supply pressure of the gas in the gas flow path 3 is abnormal is counted.

Further, in the electronic gas meter according to the present invention described in claim 23, in the electronic gas meter according to the present invention described in claim 21 or 22, the abnormality determination frequency counting means 11M is provided in the gas flow path 3. The number of times that the supply pressure abnormality determination means 11B and 11G determine that the supply pressure of the gas is abnormal is counted over the latest certain number of days in the past.

According to the gas supply pressure abnormality detecting device of the present invention, as shown in FIG. 1, the pressure of the gas in the gas passage 3 periodically changes with the consumption of the gas by the gas consuming source. When a large fluctuation occurs, the supply pressure abnormality determination unit 11B performs the determination based on the measurement result of the pressure measurement unit PS in a state where the gas passing through the gas passage 3 is present, and determines the gas supply pressure in the gas passage 3 Will be detected.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 2, in the gas supply pressure abnormality detecting device of the present invention described in claim 1, the gas supply pressure The supply pressure of the gas changes, and the pressure is out of the normal pressure regulation range.
When it is determined by the pressure fluctuation determining means 11A that a periodic fluctuation has occurred in the gas pressure in the gas, the maximum of the periodic fluctuation of the gas pressure in the gas flow path 3 obtained from the measurement result of the pressure measuring means PS. When the difference between the value and the minimum value exceeds a predetermined pressure fluctuation threshold value, the supply pressure abnormality determining means 11B determines that there is an abnormality in the gas supply pressure in the gas flow path 3.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 3, in the gas supply pressure abnormality detecting device of the present invention described in claim 1 or 2, the gas in the gas flow path 3 is provided. When it is determined by the pressure fluctuation determining means 11A that the pressure has periodically fluctuated, a plurality of measurement results of the pressure measuring means PS in a state where there is a gas passing through the gas flow path 3, which is the basis of the determination. If the representative pressure value determined from is not lower than the abnormality determination pressure value that is equal to or higher than the lower limit value of the normal range of the supply pressure, the supply pressure abnormality of the supply pressure of the gas in the gas passage 3 is determined. The determination by the determination means 11B is not performed.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 4, in the gas supply pressure abnormality detecting device of the present invention described in claim 3, the gas passing through the gas flow path 3 is If the average value of the plurality of measurement results of the pressure measuring means PS in a certain state does not fall below the abnormal determination pressure value equal to or higher than the lower limit value of the normal range of the supply pressure, the pressure of the gas in the gas flow path 3 periodically changes. Pressure fluctuation judging means 1
Even in the case where the determination is made by 1A, the determination by the supply pressure abnormality determination means 11B as to whether there is an abnormality in the supply pressure of the gas in the gas flow path 3 is not performed.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 5, in the gas supply pressure abnormality detecting device of the present invention described in claim 3, the gas passing through the gas flow path 3 is provided. If the maximum value of the plurality of measurement results of the pressure measuring means PS in a certain state does not fall below the abnormality determination pressure value equal to or higher than the lower limit value of the normal range of the supply pressure, the pressure of the gas in the gas flow path 3 periodically changes. Even if it is determined by the pressure fluctuation determining means 11A that a fluctuation has occurred, the determination by the supply pressure abnormality determining means 11B of whether there is an abnormality in the gas supply pressure in the gas flow path 3 is not performed. become.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 6, in the gas supply pressure abnormality detecting device of the present invention described in claim 1, 2, 3 or 4, Gas flow generation determining means 11C based on a temporal change of the gas flow rate in gas flow path 3 measured by measuring means VS.
Detects the occurrence of a gas flow in the gas flow path 3, determines that there is a gas passing through the gas flow path 3 and determines whether there is a periodic fluctuation in the pressure of the gas in the gas flow path 3. The determination by the supply pressure abnormality determining means 11B is performed.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 7, in the gas supply pressure abnormality detecting device of the present invention described in claim 6, the flow rate measuring means V
When the gas flow generation determination means 11C detects the generation of the gas flow in the gas flow path 3 based on the change with time of the gas flow velocity in the gas flow path 3 measured by S, the gas flow in the gas flow path 3 A pressure measuring means for obtaining a plurality of measurement results in a state where there is gas passing through the gas flow path 3 based on the pressure fluctuation determining means 11A when determining whether there is a periodic fluctuation in pressure. The measurement of the pressure of the gas in the gas flow path 3 by the PS is performed in a shorter cycle than before.

According to the gas supply pressure abnormality detecting device of the present invention, as shown in FIG. 2, the supply pressure of the gas regulated at the upstream side of the gas passage 3 is normal. Even if the pressure is in the pressure regulation range, the gas supply pressure changes on the downstream side of the gas flow path 3 to deviate from the normal pressure regulation range,
When the gas flow rate of the gas in the gas flow path 3 changes periodically as the gas is consumed by the gas consumption source, the gas passage determination unit 11E determines that there is a gas passing through the gas flow path 3. An abnormality in the gas supply pressure in the gas flow path 3 is detected by the determination performed by the supply pressure abnormality determination unit 11G based on the measurement result of the flow velocity measurement unit VS.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 9, in the gas supply pressure abnormality detecting device of the present invention described in claim 8, the gas supply pressure Is determined by the flow rate fluctuation determining means 11F that the supply pressure of the gas changes from the normal pressure adjustment range due to a change in the supply pressure of the gas, and that the gas flow rate in the gas flow path 3 periodically changes due to the consumption of the gas by the gas consuming source. The flow velocity measuring means VS
When the difference between the maximum value and the minimum value of the periodic fluctuation of the gas flow velocity in the gas flow path 3 obtained from the measurement result of the above exceeds a predetermined flow velocity fluctuation threshold value, the supply pressure of the gas in the gas flow path 3 is reduced. If there is an abnormality, it is determined by the supply pressure abnormality determining means 11G.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 10, in the gas supply pressure abnormality detecting device of the present invention described in claim 8 or 9, the gas in the gas flow path 3 When it is determined by the flow velocity fluctuation determining means 11F that a periodic fluctuation has occurred in the flow velocity, a plurality of measurement results of the pressure measuring means PS in a state in which there is a gas passing through the gas flow path 3 on which the determination is based If the representative pressure value determined from the above is not lower than the predetermined abnormality determination flow rate value, the supply pressure abnormality determination means 11G determines whether there is an abnormality in the gas supply pressure in the gas flow path 3. Will not be.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 11, in the gas supply pressure abnormality detecting device of the present invention described in claim 10, the gas flow path 3
If the average value of the plurality of measurement results of the flow velocity measuring means VS in a state where there is gas passing through the gas flow path does not fall below a predetermined abnormality determination flow velocity value, a periodic fluctuation occurs in the gas flow velocity in the gas flow path 3. Therefore, even in the case where the determination is made by the flow velocity variation determination means 11F, the determination by the supply pressure abnormality determination means 11G as to whether or not there is an abnormality in the gas supply pressure in the gas flow path 3 is not performed.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 12, in the gas supply pressure abnormality detecting device of the present invention described in claim 10, the gas passing through the gas passage 3 is If the maximum value of the plurality of measurement results of the flow velocity measuring means VS in a certain state does not fall below the abnormality determination pressure value equal to or higher than the lower limit value of the normal range of the supply pressure, the flow velocity of the gas in the gas flow path 3 is periodically changed. Even if it is determined by the flow velocity variation determining means 11F that a variation has occurred, the gas flow path 3
The determination by the supply pressure abnormality determination means 11G of whether or not there is an abnormality in the supply pressure of the gas in the chamber is not performed.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 13, the gas supply pressure abnormality detecting device of claims 8, 9, 10,
In the gas supply pressure abnormality detection device according to the present invention described in 11 or 12, the gas flow generation determination means 11H detects the gas flow based on a temporal change of the pressure of the gas passing through the gas flow path 3 measured by the pressure measurement means VS. When the generation of the gas flow in the passage 3 is detected, it is assumed that there is a gas passing through the gas passage 3 and the supply of the gas flow in the gas passage 3 to determine whether there is a periodic variation in the flow velocity of the gas. The determination by the pressure abnormality determining means 11G is performed.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 14, in the gas supply pressure abnormality detecting device of the present invention described in claim 13, the gas measured by the pressure measuring means VS. When the gas flow generation determining means 11H detects the generation of the gas flow in the gas flow path 3 based on the temporal change of the pressure of the gas passing through the flow path 3, the gas flow rate in the gas flow path 3 is periodically changed. The gas flow path by the flow velocity measuring means VS for obtaining a plurality of measurement results based on the gas passing through the gas flow path 3 based on the flow velocity fluctuation determining means 11F when determining whether there is a fluctuation. The measurement of the flow velocity of the gas in 3 will be performed in a shorter cycle than before.

Furthermore, according to the gas supply pressure abnormality detecting device of the present invention described in claim 15, in the gas supply pressure abnormality detecting device of the present invention described in claim 13 or 14, the gas in the gas flow path 3 is provided. When it is determined by the flow velocity fluctuation determining means 11F that the pressure has periodically fluctuated, the gas passage determining means 11E determines that there is a gas passing through the gas flow path 3 on which the determination is based. In this state, if the gas pressure in the gas flow path 3 measured by the pressure measuring means PS does not fall below the abnormal determination pressure value equal to or higher than the lower limit of the normal range of the supply pressure, the gas supply in the gas flow path 3 is started. The determination by the supply pressure abnormality determining means 11G of whether there is an abnormality in the pressure is not performed.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 16, as shown in FIGS. 1 and 2, claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 1
In the gas supply pressure abnormality detection device according to the present invention described in 0, 11, 12, 13, 14, or 15, the supply pressure abnormality determination means 1 counted by the abnormality determination number counting means 11M.
When the number of times that the supply pressure of the gas in the gas passage 3 is determined to be abnormal by the 1B or the supply pressure abnormality determination means 11G reaches a predetermined number of times of notification, the supply pressure of the gas in the gas passage 3 is reduced. The report data indicating that there is an abnormality is generated and output by the report data generation and output means 11N in order to transmit the report data to the remote monitoring host computer via the telephone line.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 17, in the gas supply pressure abnormality detecting device of the present invention described in claim 16, the supply pressure abnormality determining means 11B and the supply pressure abnormality By the abnormality determination means 11G,
When it is determined that the supply pressure of the gas in the gas flow path 3 is abnormal for a predetermined number of times of executing the notification continuously, the notification data is generated and output by the notification data generation and output unit 11N.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 18, in the gas supply pressure abnormality detecting device of the present invention described in claim 16 or 17, the supply pressure abnormality determining means 11B If the supply pressure abnormality determining means 11G determines that the supply pressure of the gas in the gas flow path 3 has an abnormality during the latest predetermined number of days in the past, the predetermined number of times of execution of the notification is determined, the notification data is output to the notification data generation and output means 11N. Is generated and output.

Furthermore, according to the electronic gas meter of the present invention described in claim 19, as shown in FIG. 3, the gas supply pressure abnormality detection of the present invention described in claim 1, 2, 3, 4 or 5 is realized. In an electronic gas meter having a built-in device, when a change occurs in the gas supply pressure on the downstream side of the gas flow path 3, the gas pressure is determined by the supply pressure abnormality determination means 11B based on the measurement result of the pressure measurement means PS. An abnormality in the gas supply pressure in the flow path 3 is detected.

According to the electronic gas meter of the present invention described in claim 20, as shown in FIG.
In an electronic gas meter incorporating the gas supply pressure abnormality detecting device according to the present invention described in 7, 8, 9, 10, 11, 12, 13, 14, or 15, the gas supply pressure is reduced on the downstream side of the gas flow path 3. When a change occurs, a determination is made by the supply pressure abnormality determination unit 11B based on the measurement result of the pressure measurement unit PS, or a determination is made by the supply pressure abnormality determination unit 11G based on the measurement result of the flow velocity measurement unit VS. Thus, the abnormality of the gas supply pressure in the gas flow path 3 is detected.

Further, according to the electronic gas meter of the present invention described in claim 21, as shown in FIGS.
21. In the electronic gas meter according to the present invention according to claim 19 or 20, the supply of the gas in the gas flow path 3 by the supply pressure abnormality determination means 11B and the supply pressure abnormality determination means 11G counted by the abnormality determination number counting means 11M. When the number of times that the pressure is determined to be abnormal reaches a predetermined number of times of execution of the notification, notification data indicating that the supply pressure of the gas in the gas flow path 3 is abnormal is transmitted via a telephone line to the remote monitoring host computer. Is generated and output by the notification data generation and output means 11N.

According to the electronic gas meter of the present invention described in claim 22, in the electronic gas meter of the present invention described in claim 21, the supply pressure abnormality determining means 11B
When it is determined that the supply pressure of the gas in the gas flow path 3 is abnormal by the predetermined number of times of execution of the notification, the notification data is generated and output by the notification data generation and output unit 11N. Will be done.

Further, according to the electronic gas meter of the present invention described in claim 23, in the electronic gas meter of the present invention described in claim 21 or 22, the supply pressure abnormality determination means 11B and the supply pressure abnormality determination means 11G. When it is determined that the supply pressure of the gas in the gas flow path 3 is abnormal during the latest predetermined number of days, the report data is generated and output by the report data generation and output unit 11N. Will be.

[0056]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas supply pressure abnormality detecting device according to the present invention, together with an electronic gas meter, will be described below with reference to the drawings.

FIG. 5 is an explanatory diagram showing a schematic configuration of an electronic gas meter according to the first embodiment of the present invention. The electronic gas meter (hereinafter, referred to as reference numeral 1) of the present embodiment shown in FIG.
Abbreviated as "gas meter". ) Are the flow path 3 (corresponding to the gas flow path), the first and second acoustic transducers TD1,
TD3 (corresponding to flow velocity measuring means), transmitting circuit 5, receiving circuit 7, pressure sensor PS (corresponding to pressure measuring means), microcomputer 11 (hereinafter abbreviated as "microcomputer"), alarm output section 13, display section 15 (corresponding to display means), a network control device (hereinafter referred to as “NCU”) 17 and the like.

The flow path 3 is provided inside the gas meter 1. A gas (not shown) flowing through a gas pipe (not shown) to which the gas meter 1 is connected is introduced into the flow path 3. After flowing in the flow direction indicated by A, it is configured to be discharged to a downstream portion of the gas pipe.

The first acoustic transducer TD1 comprises:
The transmission / reception surface is disposed in the flow path 3 with the transmission / reception surface facing downstream in the flow direction A. The second acoustic transducer TD3 moves the transmission / reception surface in the flow path 3 upstream in the flow direction A. , First acoustic transducer T
It is arranged to face the transmitting / receiving surface of D1.

The transmission circuit 5 is connected to a first acoustic transducer TD via a first transducer interface circuit (hereinafter, referred to as a "first TDI / F circuit") 9a.
1 and connected to a second acoustic transducer TD3 via a second transducer interface circuit (hereinafter, referred to as a "second TDI / F circuit") 9b.

Then, the transmission circuit 5 supplies one of the first acoustic transducer TD1 and the second acoustic transducer TD3 via one of the first TDI / F circuit 9a and the second TDI / F circuit 9b. In order to output an ultrasonic signal from one of the acoustic transducers TD1 and TD3, a drive signal is output in the form of a pulse burst.

The receiving circuit 7 includes a first TDI / F circuit 9
a, and is connected to the second acoustic transducer TD3 via the second TDI / F circuit 9b.

The receiving circuit 7 receives an input from one of the first acoustic transducer TD1 and the second acoustic transducer TD3 via one of the first TDI / F circuit 9a and the other of the second TDI / F circuit 9b. The other acoustic transducers TD1, TD
3 is configured to pre-amplify the received ultrasonic signal and output it as a detection signal.

The pressure sensor PS is disposed in the flow path 3 and is configured to output a signal of a level corresponding to the pressure of the gas passing through the flow path 3.

The microcomputer 11 includes a CPU 11a, an RA
M11b and ROM 11c, and the CPU 11a includes a RAM 11b and a ROM 11c.
In addition, the transmission circuit 5, the reception circuit 7, the pressure sensor PS,
The alarm output unit 13, the display unit 15, and the NCU 17 are connected to each other.

The RAM 11b has a data area for storing various data and a work area used for various processing operations. The ROM 11c stores a control program for causing the CPU 11a to perform various processing operations. .

The display unit 15 controls the microcomputer 11 based on the propagation time of the ultrasonic signal transmitted and received between the first acoustic transducer TD1 and the second acoustic transducer TD3.
The integrated flow rate and the like of the gas flowing through the gas pipe (not shown) or the flow path 3 (not shown) are displayed.

When the microcomputer 11 determines that there is an abnormality in the gas supply pressure, the alarm output unit 13 is configured to display a warning or output sound as an alarm.

The NCU 17 notifies the remote management host computer (not shown) via the telephone network TP when the microcomputer 11 determines that the gas supply pressure is abnormal. Calling operation of
Communication interface circuit for connection to the telephone network
This is referred to as a “communication I / F circuit”. ) 17a.

Next, the gas supply pressure abnormality detection processing performed by the CPU 11a according to the control program stored in the ROM 11c will be described with reference to the flowchart of FIG.

When a battery (not shown) in the gas meter 1 is connected and the microcomputer 11 is started and the program is started, the CPU 11a firstly performs flow velocity measurement as shown in FIG. 6 (step S1).

The flow velocity measurement in step S1 is specifically performed as follows.

That is, first, the transmission circuit 5 sends the first TDI /
A drive signal is output to the first acoustic transducer TD1 via the F circuit 9a, and based on the detection signal input from the second TDI / F circuit 9b via the receiving circuit 7, the first acoustic transducer TD1 receives the drive signal from the second acoustic transducer TD1.
3 is measured for the outward propagation time Tf of the ultrasonic signal.

Subsequently, a drive signal is output from the transmission circuit 5 to the second acoustic transducer TD3 via the second TDI / F circuit 9b, and a detection signal input from the first TDI / F circuit 9a via the reception circuit 7 is output. Based on the first acoustic transducer TD1 by measuring the return propagation time Tr of the ultrasonic signal from the second acoustic transducer TD3 to the acoustic transducer TD1 and subtracting the return propagation time Tr from the previously measured forward propagation time Tf. A propagation time difference Td = Tf−Tr of the ultrasonic signal between the first acoustic transducer and the second acoustic transducer TD3 is calculated.

Then, the flow velocity V of the gas passing through the flow path 3 is measured based on the propagation time difference Td and the interval between the first acoustic transducer TD1 and the second acoustic transducer TD3.

[0076] If the flow velocity V of gas passing through the flow path 3 at step S1 was measured, then, confirms whether the calculated flow velocity V is changed with respect to the flow velocity V ₀ of the last measurement (Step S3) If it has not changed (N in step S3), the process proceeds to step S25 described later.

On the other hand, if the calculated flow velocity V is different from the previously measured flow velocity V ₀ (Y in step S3), the flow is executed to measure the flow velocity V of the gas passing through the flow path 3. After setting the repetitive sampling cycle of the forward propagation time Tf and the return propagation time Tr of the ultrasonic signal between the acoustic transducer TD1 and the second acoustic transducer TD3 to a constant or random sampling cycle shorter than the normal cycle (step S5) It is checked whether or not the time of the set repetitive sampling period has elapsed (step S7). If it has not elapsed (N in step S7), step S7 is repeated until the time has elapsed.

On the other hand, if the time of the repetitive sampling period has elapsed (Y in step S7), the flow velocity V of the gas passing through the flow path 3 is calculated in the same manner as in step S1 (step S9). The pressure P of the gas passing through the flow path 3 is measured based on the output signal of the pressure sensor PS (step S11), and the data of the maximum value and the minimum value of the pressure P stored in the buffer area of the RAM 11b are obtained. After updating the content of the pressure P of the gas measured in step S11 to the content (step S13), whether the flow velocity V and the pressure P of the gas passing through the flow path 3 have been measured a predetermined number of times by the repetitive sampling cycle. It is confirmed whether or not it is (step S15).

If the gas flow velocity V and pressure P have not been measured a predetermined number of times (N in step S15), step S15 is performed.
5 and if the operation has been performed a predetermined number of times (step S1
(5) Y), a differential pressure value ΔP between the maximum value and the minimum value of the pressure P stored in the buffer area of the RAM 11b is determined (step S17), and whether the differential pressure value ΔP exceeds a predetermined pressure difference threshold value Pdif. (Step S1)
9) If not higher (N in step S19),
Proceed to step S25.

On the other hand, when the differential pressure value ΔP exceeds the pressure difference threshold value Pdif (Y in step S19), the average value of the gas pressures P measured a predetermined number of times is determined by the normal pressure of the gas by a pressure regulator (not shown). It is checked whether the pressure is below the abnormality determination pressure value Pth set to a value higher than the lower limit value of the supply pressure adjustment range (step S21).

The average value of the gas pressure P is equal to the abnormality determination pressure value P.
If not less than th (N in step S21), the process proceeds to step S25, and if less than th (step S21).
21), after performing the abnormality warning process (step S2).
3), and proceed to step S25.

In the abnormality alarm process at step S23, an alarm indicating that the gas supply pressure is abnormal is output to the alarm output unit 1 although detailed illustration on the flowchart is omitted.
The NCU 17 performs a calling operation for displaying or outputting a sound to the control host computer 3 and notifying the management host computer (not shown) via the telephone network TP that the gas supply pressure is abnormal.
When a telephone line with the management host computer is formed, notification data indicating that the gas supply pressure is abnormal is transmitted from the NCU 17 to the telephone line network TP via the communication I / F circuit 17a. Let it.

In step S3, if the flow velocity V measured in step S1 has not changed from the previously measured flow velocity V ₀ (N), in step S19, the pressure difference ΔP of the pressure P is increased by a predetermined pressure difference. If it does not exceed the threshold value Pdif (N), if the average value of the gas pressure P does not fall below the abnormality determination pressure value Pth in step S21 (N), and if the abnormality warning process in step S23 is executed, the process proceeds. In step S25, the repetitive sampling cycle of the forward propagation time Tf and the return propagation time Tr of the ultrasonic signal, which is executed to measure the flow velocity V of the gas passing through the flow path 3, is set to a normal sampling cycle. Next, it is confirmed whether or not the time of the set normal sampling period has elapsed (step S27).

If the normal sampling period has not elapsed (N in step S27), step S is performed until the normal sampling period has elapsed.
27 is repeated, and when the time of the normal sampling period has elapsed (Y in step S27), the process returns to step S1.

As is clear from the above description, in the first embodiment, step S in the flowchart of FIG.
Steps 13 to S17 correspond to the processing corresponding to the pressure fluctuation determining means 11A in the claims. Steps S19 and S21 in FIG. 6 correspond to the processing corresponding to the supply pressure abnormality determining means 11B in the claims. Has become.

In the first embodiment, step S3 in FIG. 6 is processing corresponding to the gas flow generation determining means 11C in the claims, and step S5 in FIG. 6 is pressure measurement in the claims. This is processing corresponding to the cycle setting means 11D.

Next, the operation (action) of the gas meter 1 of the first embodiment configured as described above will be described.

First, when the gas meter 1 starts operating,
Usually, the flow velocity V of the gas flowing in the flow path 3 is measured using the first acoustic transducer TD1 and the second acoustic transducer TD3 at each sampling cycle.

Then, when the gas that has not been consumed starts to be consumed in the gas consumption source (not shown) connected to the downstream side of the gas pipe (not shown), the gas flows in the flow path 3 accordingly. The flow velocity V of the gas changes, and as a result, the flow velocity V
Changes from the previous flow velocity V ₀ measured when the previous normal sampling cycle arrived, and the measurement cycle of the flow velocity V changes from the normal sampling cycle to a shorter or more constant or random repetitive sampling cycle. Is done.

When the measurement cycle of the flow velocity V is changed from the normal sampling cycle to a shorter or more constant or random repetitive sampling cycle, the first acoustic transducer TD1 and the second acoustic transducer TD1 are changed for each repetitive sampling cycle.
The flow velocity V of the gas in the flow path 3 is measured a predetermined number of times using the acoustic transducer TD3, and the pressure P of the gas in the flow path 3 is measured a predetermined number of times using the pressure sensor PS. .

Here, a decrease in gas supply pressure between the gas meter 1 and a gas consumption source (not shown) connected to a downstream portion of the gas pipe (not shown) due to a pressure loss or the like in the gas meter 1 itself or the gas pipe. If no flow has occurred, flow path 3
After the flow velocity V and pressure P of the gas in the inside are repeatedly measured a predetermined number of times by the sampling cycle, the cycle is returned to the normal sampling cycle until the gas consumption state by the gas consumption source (not shown) changes, and the flow path is changed. Only the measurement of the flow velocity V of the gas in 3 is performed.

On the other hand, a gas consumption source (not shown) connected to a downstream side of a gas pipe (not shown) and a gas meter 1
If the gas supply pressure is reduced due to a pressure loss in the gas meter 1 itself or the gas pipe, the gas consumption by the gas consumption source (not shown) is started. The pressure P of the gas within the range exceeding the predetermined pressure difference threshold value Pdif while maintaining a level above the lower limit value of the normal supply pressure adjustment range by the pressure regulator (not shown) and exceeding the abnormality determination pressure value Pth. Periodically fluctuates up and down.

Then, an alarm indicating that the gas supply pressure is abnormal is output from the alarm output unit 13 by display or sound, and a call operation to a management host computer (not shown) is performed by the NCU 17. When a telephone line with the computer is formed, report data is sent to the telephone line network TP via the NCU 17 and the communication I / F circuit 17a, and a report is sent to the management host computer indicating that the gas supply pressure is abnormal. Is done.

After the notification to the management host computer, the cycle is returned to the normal sampling cycle and the flow rate V of the gas in the flow path 3 is changed unless the gas consumption by the gas consumption source (not shown) changes. Only the measurement is performed.

When the operation of the gas heat pump is started in another dwelling unit connected to the upstream side of the gas pipe (not shown), the gas is not consumed by the gas consumption source (not shown). Although the gas heat pump does not occur in the flow path 3, the flow path 3
Due to the pulsation generated in the gas inside, the flow velocity V of the gas in the flow path 3 measured using the first acoustic transducer TD1 and the second acoustic transducer TD3 is not zero.

Then, the value of the gas flow velocity V measured in each normal sampling cycle changes from the previous flow velocity V ₀ measured when the previous normal sampling cycle has arrived.
The measurement cycle of the flow velocity V is changed from the normal sampling cycle to a shorter or more constant or random repetitive sampling cycle, and the gas flow velocity V is measured a predetermined number of times in each repetitive sampling cycle, and the same repetition is performed. At every sampling cycle, the pressure P of the gas in the flow path 3 is measured a predetermined number of times using the pressure sensor PS.

By the way, when pulsation occurs in the gas in the flow path 3 with the start of the operation of the gas heat pump, the pressure P of the gas in the flow path 3 periodically fluctuates up and down in accordance with the pulsation cycle. The amount is the fluctuation range of the pressure P generated in the gas in the flow path 3 when the gas is consumed by the gas consuming source in a state where the gas supply pressure is reduced due to a pressure loss in the gas meter 1 itself or a gas pipe. The pressure P of the gas in the flow path 3 does not periodically fluctuate up and down with a width exceeding a predetermined pressure difference threshold value Pdif.

Further, when pulsation occurs in the gas in the flow path 3 at the start of the operation of the gas heat pump, the gas is not actually consumed in the gas consumption source (not shown). The pressure P of the gas inside the pump hardly drops from a value in a state where no pulsation occurs before the operation of the gas heat pump is started, and is higher than a lower limit of a normal supply pressure adjustment range by a pressure regulator (not shown). The level exceeding the discrimination pressure value Pth is maintained.

Therefore, when pulsation occurs in the gas in the flow path 3 with the start of operation of the gas heat pump in another dwelling unit connected to the upstream side of the gas pipe (not shown), the pressure in the gas meter 1 itself and the pressure in the gas pipe are increased. As in the case where the gas is consumed by the gas consuming source while the gas supply pressure is decreasing due to loss or the like, an alarm is output from the alarm output unit 13 or the telephone line is transmitted by the NCU 17 and the communication I / F circuit 17a. The fact that the gas supply pressure is abnormal is not reported to the management host computer via the network TP.

The flow velocity V and pressure P of the gas in the flow path 3
Is repeatedly measured a predetermined number of times in the sampling cycle, the cycle is returned to the normal sampling cycle and the flow rate V of the gas in the flow path 3 is changed unless the gas consumption state by the gas consumption source (not shown) changes. Only measurement will be performed.

As described above, according to the gas meter 1 of the first embodiment, the flow velocity V of the gas in the flow path 3 which is measured by the first acoustic transducer TD1 and the second acoustic transducer TD3 in each normal sampling cycle is: Previous flow velocity V measured when the previous normal sampling period arrived
When the pressure changes from _0, the pressure P of the gas in the flow path 3 is measured over a predetermined number of times using the pressure sensor PS.
Is periodically increased and decreased with a width exceeding a predetermined pressure difference threshold value Pdif, an alarm is output from the alarm output unit 13 and transmitted to the management host computer via the telephone network TP by the NCU 17 and the communication I / F circuit 17a. It is configured to report that the gas supply pressure is abnormal.

Therefore, the gas supply pressure is not limited to the gas supply pressure abnormality caused by the pressure adjustment failure of the pressure regulator (not shown), but the gas supply pressure abnormality caused by the pressure loss in the gas meter 1 or the gas pipe downstream of the gas meter. Can be reliably detected, an abnormality in the supply pressure of the gas regulated by the pressure regulator can be widely detected, and a warning and notification can be made.

Next, a gas meter according to a second embodiment of the present invention will be described.

The gas meter of the second embodiment has the same hardware configuration as the gas meter 1 of the first embodiment. Only the control program stored in the ROM 11c of the microcomputer 11 is the same as that of the gas meter of the first embodiment. The content is different from 1.

The gas supply pressure abnormality detection processing performed by the CPU 11a in accordance with the control program stored in the ROM 11c of the microcomputer 11 in the gas meter according to the second embodiment will be described with reference to the flowchart of FIG.

However, in the gas meter 1 of the first embodiment shown in FIG. 6, only the same parts as those in the gas supply pressure abnormality detection processing performed by the CPU 11a according to the control program stored in the ROM 11c of the microcomputer 11 will be described. In this case, the repeated explanation of the specific contents will be avoided, and here, the ROM 11c in the gas meter 1 of the first embodiment will be described.
The points that are different from the storage program described above will be mainly described.

In the gas supply pressure abnormality detection processing performed by the CPU 11a in accordance with the storage program in the ROM 11c in the gas meter according to the second embodiment, first, at step S
The processes from 1 to S11 are performed in the same manner as in the first embodiment.

Then, in step S11, the pressure P of the gas passing through the flow path 3 is measured based on the output signal of the pressure sensor PS, and then in step S13 ', R
The data of the maximum value and the minimum value of the flow velocity V stored in the buffer area of the AM 11b are updated to the contents in which the value of the flow velocity V of the gas measured in step S9 is added, and then the step is performed similarly to the first embodiment. In S15, it is confirmed whether or not the flow velocity V and the pressure P of the gas passing through the flow path 3 have been measured a predetermined number of times in a repeated sampling cycle.

If the gas flow velocity V and pressure P have not been measured a predetermined number of times (N in step S15), step S15
5 and if the operation has been performed a predetermined number of times (step S1
Y at 5), the difference value ΔV between the maximum value and the minimum value of the flow velocity V stored in the buffer area of the RAM 11b is determined (step S17), and whether or not the difference value ΔV exceeds a predetermined flow velocity difference threshold Vdif. (Step S19)
'), If not higher (N in step S19'), the process proceeds to step S25.

On the other hand, in step S19 ', the difference value ΔV between the maximum value and the minimum value of the flow velocity V is set to a predetermined flow velocity difference threshold value Vdif.
(Y), all (or a part of) the gas pressures P measured a predetermined number of times are values above the lower limit of the normal gas supply pressure adjustment range by a pressure regulator (not shown). It is determined whether or not the pressure is lower than the abnormality determination pressure value Pth set in (step S21 ').

If all (or a part) of the gas pressures P measured a predetermined number of times are not below the abnormality determination pressure value Pth (N in step S21 '), the process proceeds to step S25, and if they are below, In step S21 ′, as in the first embodiment, the process proceeds to step S25 after executing the abnormality warning process in step S23.

In step S19 ', the difference value ΔV between the maximum value and the minimum value of the flow velocity V is set to a predetermined flow velocity difference threshold V
If it does not exceed dif (N), step S21 '
In (N), if all (or a part) of the gas pressures P measured a predetermined number of times are not lower than the abnormality determination pressure value Pth (N), after executing the abnormality alarm process in step S23, the description is omitted. in step S3 that, in step S25 the flow velocity V measured in step S1 proceeds each case not changed with respect to the flow velocity V ₀ of the last measurement (N), like the first embodiment, the sampling period normal The sampling period is set, and in the subsequent step S27, it is confirmed whether or not the time of the set normal sampling period has elapsed.

As is clear from the above description, in the second embodiment, step S in the flowchart of FIG.
13 ', step S15, and step S17'
The processing corresponds to the flow velocity fluctuation determining means 11F in the claims, and corresponds to steps S19 and S21 in FIG.
'Is a process corresponding to the supply pressure abnormality determining means 11G in the claims.

In the second embodiment, step S3 in FIG. 6 is processing corresponding to the gas passage determination means 11E and the gas flow generation determination means 11H in the claims.
Step S5 in the flow velocity measurement cycle setting means 1 in the claim
This is processing corresponding to 1J.

Next, the operation (operation) of the gas meter 1 according to the second embodiment configured as described above will be described.

First, when the gas meter 1 starts operating,
Usually, the flow velocity V of the gas flowing in the flow path 3 is measured using the first acoustic transducer TD1 and the second acoustic transducer TD3 at each sampling cycle.

Then, when the gas that has not been consumed is started to be consumed at the gas consumption source (not shown) connected to the downstream side of the gas pipe (not shown), the gas flows in the flow path 3 accordingly. The flow velocity V of the gas changes, and as a result, the flow velocity V
Changes from the previous flow velocity V ₀ measured when the previous normal sampling cycle arrived, and the measurement cycle of the flow velocity V changes from the normal sampling cycle to a shorter or more constant or random repetitive sampling cycle. Is done.

When the measurement cycle of the flow velocity V is changed from the normal sampling cycle to a shorter or more constant or random repetitive sampling cycle, the first acoustic transducer TD1 and the second
The flow velocity V of the gas in the flow path 3 is measured a predetermined number of times using the acoustic transducer TD3, and the pressure P of the gas in the flow path 3 is measured a predetermined number of times using the pressure sensor PS. .

Here, a decrease in gas supply pressure between the gas meter 1 and a gas consumption source (not shown) connected to a downstream portion of the gas pipe (not shown) due to a pressure loss or the like in the gas meter 1 or the gas pipe. If no flow has occurred, flow path 3
After the gas flow velocity V and pressure P in the inside are repeatedly measured a predetermined number of times by the sampling cycle, the cycle is returned to the normal sampling cycle until the gas consumption state by the gas consumption source (not shown) changes, and the flow path is changed. Only the measurement of the flow velocity V of the gas in 3 is performed.

On the other hand, a gas consumption source (not shown) connected to a downstream side of a gas pipe (not shown) and a gas meter 1
When the gas supply pressure is reduced due to a pressure loss in the gas meter 1 itself or the gas pipe, a predetermined number of times are measured in conjunction with the start of gas consumption by the gas consumption source (not shown). The flow velocity V of the gas in the flow path 3 is equal to or less than the predetermined flow velocity difference threshold Vdif while all (or a part of) the pressure P of the gas in the flow path 3 maintains a level exceeding the abnormality determination pressure value Pth. It fluctuates up and down periodically with the width exceeding the above.

Then, an alarm indicating that the gas supply pressure is abnormal is output from the alarm output unit 13 by display or voice, and a call operation to a management host computer (not shown) is performed by the NCU 17. When a telephone line with the computer is formed, report data is sent to the telephone line network TP via the NCU 17 and the communication I / F circuit 17a, and a report is sent to the management host computer indicating that the gas supply pressure is abnormal. Is done.

After the notification to the management host computer, the cycle is returned to the normal sampling cycle and the flow rate V of the gas in the flow path 3 is changed unless the gas consumption by the gas consumption source (not shown) changes. Only the measurement is performed.

When the operation of the gas heat pump is started in another dwelling unit connected to the upstream side of the gas pipe (not shown), the gas is not consumed by the gas consumption source (not shown), Although the gas heat pump does not occur in the flow path 3, the flow path 3
Due to the pulsation generated in the gas inside, the flow velocity V of the gas in the flow path 3 measured using the first acoustic transducer TD1 and the second acoustic transducer TD3 is not zero.

Then, the value of the gas flow velocity V measured in each normal sampling cycle changes from the previous flow velocity V ₀ measured when the previous normal sampling cycle has arrived.
The measurement cycle of the flow velocity V is changed from the normal sampling cycle to a shorter or more constant or random repetitive sampling cycle, and the gas flow velocity V is measured a predetermined number of times in each repetitive sampling cycle, and the same repetition is performed. At every sampling cycle, the pressure P of the gas in the flow path 3 is measured a predetermined number of times using the pressure sensor PS.

By the way, when pulsation occurs in the gas in the flow path 3 at the start of the operation of the gas heat pump, the flow velocity V of the gas in the flow path 3 periodically fluctuates up and down in accordance with the pulsation cycle. The amount is the fluctuation range of the flow velocity V generated in the gas in the flow path 3 when the gas is consumed by the gas consuming source in a state where the gas supply pressure is reduced due to the pressure loss in the gas meter 1 itself or the gas pipe. The flow velocity V of the gas in the flow path 3 does not periodically fluctuate up and down with a width exceeding a predetermined flow velocity difference threshold value Vdif.

If the gas in the flow passage 3 pulsates with the start of the operation of the gas heat pump, the gas is not actually consumed in the gas consumption source (not shown). The pressure P of the gas inside the pump hardly drops from a value in a state where no pulsation occurs before the operation of the gas heat pump is started, and is higher than a lower limit of a normal supply pressure adjustment range by a pressure regulator (not shown). The level exceeding the discrimination pressure value Pth is maintained.

Therefore, when pulsation occurs in the gas in the flow path 3 with the start of operation of the gas heat pump in another dwelling unit connected to the upstream side of the gas pipe (not shown), the pressure in the gas meter 1 itself and the pressure in the gas pipe are increased. As in the case where gas is consumed by a gas consuming source in a state where the gas supply pressure is reduced due to loss or the like, an alarm is output from the alarm output unit 13 or a telephone line is transmitted by the NCU 17 and the communication I / F circuit 17a. The fact that the gas supply pressure is abnormal is not reported to the management host computer via the network TP.

The flow velocity V and pressure P of the gas in the flow path 3
Is repeatedly measured a predetermined number of times in the sampling cycle, the cycle is returned to the normal sampling cycle and the flow rate V of the gas in the flow path 3 is changed unless the gas consumption state by the gas consumption source (not shown) changes. Only measurement will be performed.

As described above, according to the gas meter of the second embodiment, the flow velocity V of the gas in the flow path 3 measured at each sampling cycle using the first acoustic transducer TD1 and the second acoustic transducer TD3 is the same as the previous one. The previous flow velocity V ₀ measured when the normal sampling period has arrived
When the gas flow rate V changes from a predetermined flow rate threshold Vdif
If the frequency is periodically fluctuated up and down with a width exceeding the alarm output unit 13
From the NCU 17 and the communication I /
The F circuit 17a is configured to notify the management host computer via the telephone line network TP that the gas supply pressure is abnormal.

With the gas meter according to the second embodiment, the same effects as those of the gas meter according to the first embodiment can be obtained.

Incidentally, the pressure P of the gas in the flow path 3 or the pressure P of the gas in the flow path 3 measured a predetermined number of times by the repetitive sampling period, which is employed in the first and second embodiments described above. The supply pressure of the gas in the flow path 3 only when all (or a part of) the pressure is lower than the abnormality determination pressure value Pth which is higher than the lower limit value of the normal supply pressure adjustment range by the pressure regulator (not shown). The configuration for determining that the is abnormal may be omitted.

However, if this configuration is provided as in the above-described first and second embodiments, the gas heat pump in the other dwelling unit connected to the upstream side of the gas pipe (not shown) starts operating in the flow path 3. Is advantageous in the following points when pulsation occurs in the gas.

That is, with the pulsation generated in the gas in the flow path 3, the pressure P and the flow velocity V of the gas in the flow path 3 are periodically increased in a width exceeding a predetermined pressure difference threshold value Pdif and a flow rate difference threshold value Vdif. Even if it fluctuates up and down, the alarm output unit 13 recognizes that the gas has been consumed by the gas consuming source in a state where the gas supply pressure has decreased due to pressure loss in the gas meter 1 itself or the gas piping. This is advantageous because it is possible to prevent an alarm output from the computer or a notification of an abnormal gas supply pressure from being sent to the management host computer.

The pressure P of the gas to be checked to determine whether it is below an abnormal determination pressure value Pth higher than the lower limit of the normal supply pressure adjustment range by a pressure regulator (not shown) is:
The average value of the gas pressure P in the flow path 3 measured a predetermined number of times as in the first embodiment described above, or the gas pressure in the flow path 3 measured a predetermined number of times as in the second embodiment The value is not limited to all (or a part of) P, but may be, for example, the maximum value of the gas pressure P in the flow path 3 measured a predetermined number of times.

Then, by doing so, the gas meter 1
The criteria for judging that the gas supply pressure has dropped due to pressure loss in itself or the gas piping, etc., are set strictly,
The false alarm when the pulsation occurs in the gas in the flow path 3
This is advantageous because it is possible to further prevent the occurrence of false reports.

Further, the pressure P and the flow velocity V of the gas in the flow path 3 adopted in the first and second embodiments described above are
The gas meter 1 depends on whether or not it has periodically fluctuated up and down with a width exceeding a predetermined pressure difference threshold Pdif or a flow velocity difference threshold Vdif.
The configuration for determining whether or not the gas supply pressure has dropped due to pressure loss in the gas pipe itself or the like may be omitted.

That is, whether the gas supply pressure is reduced due to pressure loss in the gas meter 1 itself or the gas piping, etc., depending on whether the gas pressure P and the flow velocity V in the flow path 3 simply fluctuate vertically. It may be configured to judge whether or not.

However, as in the first and second embodiments described above, the gas pressure P and the flow velocity V in the flow path 3 periodically rise and fall with a width exceeding the predetermined pressure difference threshold Pdif and the flow velocity difference threshold Vdif. If it is configured to determine whether or not the gas supply pressure is reduced due to the pressure loss or the like in the gas meter 1 itself or the gas pipe, depending on whether or not the pressure has fluctuated, if the gas supply pressure or the like in the gas meter 1 or the gas pipe or the like determines Since the criterion for determining that the supply pressure has decreased is set strictly, it is possible to further prevent false alarms and false reports when pulsation occurs in the gas in the flow path 3. Is advantageous.

Further, when a configuration is adopted in which a decrease in the gas supply pressure is determined based on whether or not the gas pressure P and the flow velocity V in the flow path 3 simply fluctuate up and down periodically, All (or a part) of the pressure P or the pressure P of the gas in the flow path 3 measured a predetermined number of times by the repeated sampling cycle
However, it is determined that the supply pressure of the gas in the flow path 3 is abnormal only when the pressure is below the abnormality determination pressure value Pth which is higher than the lower limit of the normal supply pressure adjustment range by the pressure regulator (not shown). It is optional whether or not to provide such a configuration.

Furthermore, in the first and second embodiments described above, when the flow velocity V of the gas in the flow path 3 changes, it is recognized that the gas has been consumed by the gas consuming source, and Although it is configured to check whether the pressure P and the flow velocity V of the gas in the passage 3 fluctuate up and down periodically, the configuration for recognizing that the gas has been consumed by the gas consuming source is as follows. A configuration other than that for confirming a change that has occurred in the flow velocity V of the gas inside may be used.

In the first and second embodiments described above, when it is determined that the gas supply pressure has decreased due to pressure loss in the gas meter 1 itself or the gas piping, the alarm output from the alarm output unit 13 is issued. The configuration in which the output and the notification of the gas supply pressure abnormality to the management host computer are immediately performed has been described.

However, these alarm outputs and messages are generated whenever the supply pressure of the gas is reduced due to the determination of whether or not the gas supply pressure is reduced due to pressure loss in the gas meter 1 itself or the gas piping. It is performed only when it is determined consecutively, or is performed only when the number of times that the supply pressure is determined to be reduced reaches a predetermined number during a certain period of time, for example, 30 days. Is also good.

Then, by doing so, the gas meter 1
Recognizing, with a certain degree of certainty, that the gas supply pressure has dropped due to pressure loss, etc. in itself or in the gas piping, alarm output and notification will be executed, and the reliability of alarm output and notification will be increased. Can be improved,
It is advantageous.

As described above, when it is determined that the supply pressure has been lowered a plurality of times in succession, an alarm output or a notification is issued.
At 21, when the average value of the gas pressure P is lower than the abnormality determination pressure value Pth (Y), or at step S 21 ′ in the flowchart of FIG. If the count value is less than the abnormality determination pressure value Pth (Y), the number of consecutive times is counted, and if the count value reaches a predetermined number, the process proceeds to step S.
The control program stored in the ROM 11c is changed so as to execute the abnormality warning process of 23.

Similarly, when the number of times that the supply pressure is determined to have decreased has reached the predetermined number during a certain period, an alarm output or a notification is made, at step S21 in the flowchart of FIG. If the average value of the gas pressure P is lower than the abnormality determination pressure value Pth (Y), or if all (or part) of the gas pressure P measured a predetermined number of times in step S21 'in the flowchart of FIG. Abnormality determination pressure value P
When the value is below the threshold value (Y), the number of times the pressure value falls below the abnormality determination pressure value Pth during the latest fixed period is counted,
When the count value has reached the predetermined number of times, the ROM 1 executes an abnormality alarm process in step S23.
The control program stored in 1c will be changed.

In the case of such a configuration, the ROM 11c is changed as described above.
Are the processes corresponding to the abnormality determination frequency counting means 11M and the notification data generation / output means 11N in the claims.

Further, the gas meter 1 described in the first and second embodiments has not been described in detail with reference to flowcharts, but it is needless to say that the integrated gas flow rate measurement and display as a normal gas meter are performed. The CPU 11a of the microcomputer 11 has the function
In accordance with the control program stored in M11c, the processing interrupts the processing shown in the flowcharts of FIGS.
The integrated flow rate measurement and display processing will be performed.

In the integrated flow rate measurement and display processing, the flow rate V of the gas in the flow path 3 measured at every sampling cycle using the first acoustic transducer TD1 and the second acoustic transducer TD3 is used. Is calculated based on the instantaneous flow rate Qi and the cross-sectional area S of the flow path 3, and the like, and the flow rate Qt during the normal sampling cycle time is calculated. By integrating each sampling cycle,
The integrated flow rate Qs of the gas flowing through the flow path 3 is calculated, and the calculated integrated flow rate Qs is displayed on the display unit 15.

Therefore, in such a configuration, the integrated flow rate measurement and display processing described above is performed by the microcomputer 11.
The steps in the control program stored in the ROM 11c to be executed by the CPU 11a are processes corresponding to the passing flow rate measuring means 11K and the integrated flow rate measuring means 11L in the claims.

However, the present invention is not limited to the gas meter having the functions of measuring and displaying the integrated gas flow rate described above, and is configured to simply detect an abnormality in the gas supply pressure which does not have such a function. It goes without saying that the present invention can be applied to a single-function device.

In both the first and second embodiments, the flow velocity of the gas in the flow path 3 is measured in the first and second embodiments.
Although the description has been given of the case of the ultrasonic type flow rate measuring means using the acoustic transducer TD1 and the second acoustic transducer TD3, the means for measuring the gas flow rate in the flow path 3, such as a fluidic flow meter or a flow sensor, is an It is not limited to the sonic flow velocity measuring means but may be any.

However, the fact that the gas has been consumed by the gas consuming source can be recognized based on the fact that the flow velocity V of the gas in the flow path 3 has changed, as in the first and second embodiments described above. In the case of a configuration, application of the present invention to an electronic gas meter having a membrane type measuring unit of a standard generally referred to as an S-type security gas meter has some problems, so it is preferable to avoid it.

That is, in this type of electronic gas meter, since the flow rate is measured based on the number of pulse signals generated each time the gas flow reaches a certain amount and the film moves, the movement of the film is completed. Immediately after the pulse signal is generated and immediately before the pulse signal is generated, although the gas flow rate does not actually change, the measured value indicates that the pulse signal is one.
It will differ by a fixed amount corresponding to the batch.

Therefore, for example, in the case of the above-mentioned S-type security gas meter, after a certain time (for example, 15 seconds) has elapsed since the pulse signal generated at the time of the movement of the film first occurred, two times of the reciprocating movement of the film occurred. The gas flow rate is intermittently measured based on the total elapsed time until the first pulse signal is generated and the total number of pulse signals generated during that time.

Under such circumstances, especially in the case of the S-type security gas meter, the period in which the fluctuation of the gas flow velocity V can be detected is shifted at least a certain time after the first pulse signal is generated and is delayed. Therefore, it is desirable that the object to which the present invention is applied should have a gas flow rate (or flow rate) measuring means other than the film type, if possible.

Further, in each of the first and second embodiments described above, when the flow velocity V of the gas in the flow path 3 changes, the first acoustic transducer TD1 and the second acoustic transducer TD3 are used. A configuration in which the cycle for measuring the flow velocity V of the gas inside is changed from the previous normal sampling cycle to a shorter repetitive sampling cycle, and after a predetermined number of samplings, the original normal sampling cycle is returned. However, a configuration for achieving such a configuration may be omitted.

However, if this configuration is provided as in the first and second embodiments described above, the cycle of the fluctuation of the pressure P generated in the gas in the flow path 3 when the supply pressure abnormality occurs is high. Even so, the periodic fluctuation can be recognized and determined without leaking, and the detection accuracy of the gas supply pressure abnormality in the flow path 3 can be improved accordingly, which is advantageous.

[0158]

As described above, according to the gas supply pressure abnormality detecting device of the first aspect of the present invention, there is provided a device for detecting an abnormality of the supply pressure of the regulated gas in the gas passage. A pressure measuring means for measuring the pressure of the gas in the gas flow path, and based on a time-dependent change in the measurement result of the pressure measuring means in a state where there is gas passing through the gas flow path,
Pressure fluctuation determining means for determining whether there is a periodic fluctuation in the pressure of the gas in the gas flow path; and the pressure fluctuation determining means when the pressure of the gas in the gas flow path has a periodic fluctuation. In the state where it is determined, it is configured to include a supply pressure abnormality determination unit that determines whether there is abnormality in the supply pressure of the gas in the gas flow path based on the measurement result of the pressure measurement unit. .

For this reason, even if the supply pressure of the gas regulated at the upstream side of the gas flow path is within the normal pressure regulation range, the supply pressure of the gas changes at the downstream side of the gas flow path and the gas supply pressure changes normally. When the pressure is out of the proper pressure adjustment range, the gas pressure in the gas flow path is detected to be abnormal due to the periodic fluctuation of the gas pressure in the gas flow path caused by the gas consumption by the gas consuming source. Therefore, it is possible to widely detect not only the gas supply pressure abnormality caused by the pressure adjustment failure of the pressure regulator but also the abnormality of the supply pressure of the regulated gas in the gas passage.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 2, in the gas supply pressure abnormality detecting device of the present invention described in claim 1, the supply pressure abnormality determining means includes: When the difference between the maximum value and the minimum value of the periodic fluctuation of the gas pressure in the gas flow path that has been determined to have pressure fluctuation determining means exceeds a predetermined pressure fluctuation threshold,
The configuration is such that it is determined that the gas supply pressure in the gas flow path is abnormal.

For this reason, it is determined that the gas supply pressure in the gas flow path is abnormal as compared with the case where it is determined that the supply pressure of the gas in the gas flow path is abnormal simply because the pressure of the gas in the gas flow path fluctuates periodically. If the standard is set strictly and the pressure of the gas in the gas passage fluctuates periodically due to other factors, this may be mistaken for an abnormal gas supply pressure. Suppression and prevention can improve the detection accuracy of the supply pressure abnormality and, consequently, its reliability.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 3, in the gas supply pressure abnormality detecting device of the present invention described in claim 1 or 2, the supply pressure abnormality determining means is provided. A plurality of the pressure measuring means in a state where there is a gas passing through the gas flow path, on which the pressure fluctuation determining means determines that there is a periodic fluctuation in the pressure of the gas in the gas flow path. In a state where the representative pressure value determined from the measurement result is lower than the abnormality determination pressure value equal to or higher than the lower limit value of the normal range of the supply pressure, whether or not the supply pressure of the gas in the gas flow path is abnormal. Is determined.

Therefore, when a pulsation occurs in the gas in the gas flow path, the periodic fluctuation of the pressure generated in the gas in the gas flow path is mistaken for that caused by an abnormal gas supply pressure. It is possible to suppress or prevent the occurrence of the situation of being recognized, and to improve the detection accuracy of the supply pressure abnormality, and further, the reliability thereof.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 4, in the gas supply pressure abnormality detecting device of the present invention described in claim 3, the representative pressure value is the gas flow pressure. An average of a plurality of measurement results of the pressure measuring means in a state where there is a gas passing through the gas flow path, on which the pressure fluctuation determining means determines that the pressure of the gas in the passage has a periodic fluctuation. Value.

For this reason, even if there is some variation in the gas pressure in the gas flow path measured by the pressure measuring means,
By averaging these multiple measurement results, the measured gas pressure temporarily becomes an abnormal discrimination pressure value equal to or higher than the lower limit of the normal range of the supply pressure due to a measurement error unrelated to the gas supply pressure abnormality. Even if it falls below, it is possible to suppress or prevent erroneous detection of an abnormal gas supply pressure due to this fact alone, and it is possible to improve the detection accuracy of the abnormal supply pressure and, consequently, its reliability.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 5, in the gas supply pressure abnormality detecting device of the present invention described in claim 3, the representative pressure value is the gas flow pressure. The pressure fluctuation determining means determines that there is a periodic fluctuation in the pressure of the gas in the passage, and the maximum of a plurality of measurement results of the pressure measuring means in a state where there is gas passing through the gas flow path Value.

For this reason, the abnormal determination pressure value is compared with a case where a value other than the maximum value among the plurality of measurement results of the pressure measuring means is compared with an abnormal determination pressure value equal to or higher than the lower limit value of the supply pressure normal range. The probability of the measured gas pressure dropping is reduced, and the criterion for determining that the gas supply pressure is abnormal is strictly set. When a fluctuation occurs, it is possible to suppress and prevent the occurrence of a situation where the fluctuation is confused with a gas supply pressure abnormality, and it is possible to improve the detection accuracy of the supply pressure abnormality and, consequently, the reliability thereof.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 6, in the gas supply pressure abnormality detecting device of the present invention described in claim 1, 2, 3, 4, or 5, Flow velocity measuring means for measuring the flow velocity of the gas in the gas flow path, and gas flow generation determining means for detecting the generation of the flow of the gas in the gas flow path based on a change over time of the measurement result of the flow velocity measuring means; Further, the pressure fluctuation determining means, with the detection of the gas flow generation determining means of the gas flow generation in the gas flow path, as there is a gas passing through the gas flow path, It is configured to determine whether there is a periodic variation in the pressure of the gas in the gas flow path.

For this reason, the pressure fluctuation determining means determines whether or not the pressure of the gas in the gas flow path has a periodic fluctuation, and the supply pressure of the gas in the gas flow path is determined based on the determination result. The determination by the supply pressure abnormality determining means of whether or not there is an abnormality is determined by determining whether there is a periodic fluctuation in the pressure of the gas in the gas passage due to the abnormal supply pressure of the gas in the gas passage. Side, only when the gas is being consumed by the gas consuming source, so that if the pressure of the gas in the gas flow path changes periodically due to other factors, It is possible to suppress and prevent the occurrence of a situation in which the gas is mistaken for a gas supply pressure abnormality, and to improve the detection accuracy of the supply pressure abnormality and, consequently, the reliability thereof.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 7, in the gas supply pressure abnormality detecting device of the present invention described in claim 6, the detection result of the gas flow generation judging means is provided. And a pressure measurement cycle setting means for setting a measurement cycle for measuring the pressure of the gas in the gas flow path by the pressure measurement means. The measurement cycle is shortened as the gas flow generation determining means detects the generation of the flow.

For this reason, even if the cycle of the pressure fluctuation generated in the gas in the gas passage when the supply pressure abnormality occurs is high, the periodic fluctuation is not leaked and recognized by the pressure fluctuation determining means. As a result, the detection accuracy of the supply pressure abnormality of the gas in the gas flow path can be improved accordingly.

Further, according to the gas supply pressure abnormality detecting device of the present invention, it is an apparatus for detecting an abnormality in the supply pressure of the regulated gas in the gas passage, wherein the gas supply pressure abnormality is detected. Flow velocity measuring means for measuring the flow velocity of a gas passing through a road, gas passage determining means for determining the presence or absence of gas passing through the gas flow path based on a temporal change in the measurement result of the flow velocity measuring means, In a state in which the gas passage determining means determines that there is gas passing through the flow path, the flow rate of the gas passing through the gas flow path is periodically changed based on a temporal change in the measurement result of the flow rate measuring means. A flow rate variation determining means for determining whether there is a variation; and a flow rate measuring means in a state where the flow rate variation determining means determines that there is a periodic variation in the flow rate of the gas passing through the gas flow path. Based on the measurement results of And the configuration of and a determining supply 圧異 normal determining means for determining whether or not there is an abnormality in the supply pressure of the gas.

For this reason, even if the supply pressure of the gas regulated on the upstream side of the gas flow path is within the normal pressure regulation range, the supply pressure of the gas changes on the downstream side of the gas flow path and the normal pressure regulation occurs. When the pressure is out of the proper pressure regulation range, the gas flow rate in the gas flow path periodically fluctuates as the gas is consumed by the gas consuming source, and the abnormality of the gas supply pressure in the gas flow path is detected. Therefore, it is possible to widely detect not only the gas supply pressure abnormality caused by the pressure adjustment failure of the pressure regulator but also the abnormality of the supply pressure of the regulated gas in the gas passage.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 9, in the gas supply pressure abnormality detecting device of the present invention described in claim 8, the supply pressure abnormality determining means includes: When the difference between the maximum value and the minimum value of the periodic variation of the flow velocity of the gas passing through the gas flow path determined to have the flow velocity variation determination means exceeds a predetermined flow velocity variation threshold value, The configuration is such that it is determined that the supply pressure of the gas in the road is abnormal.

For this reason, it is determined that the gas supply pressure in the gas flow path is abnormal, as compared with the case where it is determined that the supply pressure of the gas in the gas flow path is abnormal simply because the flow velocity of the gas in the gas flow path changes periodically. If the standard is set strictly and the flow velocity of the gas in the gas flow path changes periodically due to other factors, it may be mistaken as an abnormal gas supply pressure. Suppression and prevention can improve the detection accuracy of the supply pressure abnormality and, consequently, its reliability.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 10, in the gas supply pressure abnormality detecting device of the present invention described in claim 8 or 9, the supply pressure abnormality determining means is provided. A plurality of the flow rate measuring means in a state where there is a gas passing through the gas flow path, on which the flow rate fluctuation determining means determines that there is a periodic change in the flow velocity of the gas flowing through the gas flow path. In a state where the representative flow velocity value determined from the measurement result is lower than the predetermined abnormality determination flow velocity value, it is configured to determine whether there is an abnormality in the gas supply pressure in the gas flow path.

For this reason, unless the representative flow velocity value is lower than the abnormality determination flow velocity value, even if there is a periodic fluctuation in the gas flow velocity flowing through the gas flow path, the gas supply pressure in the gas flow path becomes abnormal. The supply pressure abnormality determination means does not determine whether or not there is a pressure, and other factors, particularly, pulsation occurs on the upstream side of the gas flow path, causing a periodic fluctuation in the gas flow velocity. At the time, the occurrence of a situation in which this is mistaken for a periodic fluctuation in the flow velocity due to an abnormal gas supply pressure is suppressed,
Thus, the detection accuracy of the supply pressure abnormality and the reliability thereof can be improved.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 11, in the gas supply pressure abnormality detecting device of the present invention described in claim 10, the representative flow velocity value is the gas flow pressure. The flow velocity variation determining means determines that there is a periodic variation in the flow velocity of the gas passing through the path, and the plurality of measurement results of the flow velocity measuring means in a state where there is a gas passing through the gas flow path. The configuration was an average value.

For this reason, even if there is some variation in the gas flow velocity in the gas flow path measured by the flow velocity measuring means,
By averaging these multiple measurement results, the measured gas flow rate is temporarily determined as an abnormal discrimination flow rate value that is equal to or higher than the lower limit of the normal range of supply pressure due to a measurement error or the like unrelated to the gas supply pressure abnormality. Even if it falls below, it suppresses and prevents erroneous detection of an abnormal gas supply pressure due to that fact alone, and in particular, suppresses and prevents erroneous detection of abnormal supply pressure due to pulsation generated on the upstream side of the gas flow path. In doing so, the detection accuracy of the supply pressure abnormality and, consequently, its reliability can be improved.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 12, in the gas supply pressure abnormality detecting device of the present invention described in claim 10, the representative flow velocity value corresponds to the gas flow pressure. The flow velocity variation determining means determines that there is a periodic variation in the flow velocity of the gas passing through the path, and the plurality of measurement results of the flow velocity measuring means in a state where there is a gas passing through the gas flow path. The maximum value was adopted.

For this reason, compared with the case where the value other than the maximum value among the plurality of measurement results of the flow velocity measuring means is compared with the abnormal determination flow velocity value equal to or higher than the lower limit value of the normal range of the supply pressure, the abnormal determination flow velocity value is compared. By lowering the probability that the measured gas flow rate falls below, the criteria for determining that the gas supply pressure is abnormal are set strictly, and the flow rate of the gas in the gas flow path is periodically changed due to other factors. In the event of fluctuation, the occurrence of a situation in which this is mistaken for a gas supply pressure abnormality is suppressed and prevented, and in particular,
In suppressing and preventing erroneous detection of supply pressure abnormality due to pulsation generated on the upstream side of the gas flow path, detection accuracy of supply pressure abnormality and, consequently, reliability thereof can be improved.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 13, the gas supply pressure abnormality detecting device of the present invention
In the gas supply pressure abnormality detection device according to the present invention described in 11 or 12, the pressure measurement means for measuring the pressure of the gas in the gas flow path; Gas flow generation determining means for detecting generation of a gas flow in the flow path, wherein the flow velocity fluctuation determining means detects generation of a gas flow in the gas flow path by the gas flow generation determining means Accordingly, assuming that there is a gas passing through the gas flow path, it is configured to determine whether there is a periodic variation in the flow velocity of the gas passing through the gas flow path.

For this reason, the flow velocity fluctuation determining means determines whether or not there is a periodic fluctuation in the flow velocity of the gas in the gas flow path, and the supply pressure of the gas in the gas flow path is determined based on the determination result. The determination by the supply pressure abnormality determining means of whether or not there is an abnormality is determined by determining whether there is a periodic fluctuation in the gas flow velocity in the gas flow path due to the abnormal gas supply pressure in the gas flow path. Side, only when the gas is consumed by the gas consuming source, so that if the flow velocity of the gas in the gas flow path is periodically fluctuated by other factors, It is possible to suppress and prevent the occurrence of a situation in which the gas is mistaken for a gas supply pressure abnormality, and to improve the detection accuracy of the supply pressure abnormality and, consequently, the reliability thereof.

According to the gas supply pressure abnormality detecting device of the present invention described in claim 14, in the gas supply pressure abnormality detecting device of the present invention described in claim 13, the detection result of the gas flow generation judging means is provided. The apparatus further comprises a flow rate measurement cycle setting means for setting a measurement cycle for measuring the flow rate of the gas passing through the gas flow path by the flow rate measurement means, wherein the flow rate measurement cycle setting means includes: With the gas flow generation determining means detecting the generation of gas flow,
The measurement cycle was shortened.

Therefore, even if the period of the fluctuation of the flow velocity generated in the gas in the gas flow path when the supply pressure abnormality occurs is high, the periodic fluctuation is not leaked and recognized by the flow velocity fluctuation determining means. As a result, the detection accuracy of the supply pressure abnormality of the gas in the gas flow path can be improved accordingly.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 15, in the gas supply pressure abnormality detecting device of the present invention described in claim 13 or 14, the supply pressure abnormality determining means is provided. In a state where the pressure of the gas in the gas flow path measured by the pressure measuring means is lower than an abnormal determination pressure value equal to or more than a lower limit value of a normal range of the supply pressure, the gas in the gas flow path is It is configured to determine whether there is an abnormality in the supply pressure.

Therefore, when a pulsation occurs in the gas in the gas flow path, the periodic fluctuation of the pressure generated in the gas in the gas flow path is mistaken for that caused by an abnormal gas supply pressure. It is possible to suppress or prevent the occurrence of the situation of being recognized, and to improve the detection accuracy of the supply pressure abnormality, and further, the reliability thereof.

According to the electronic gas meter of the present invention described in claim 19, the electronic gas meter incorporating the gas supply pressure abnormality detecting device of the present invention described in claim 1, 2, 3, 4 or 5 is provided. A flow rate measuring means for measuring a flow rate of the gas in the gas flow path; and a passage for measuring a flow rate of the gas passing through the gas flow path based on a temporal change of a measurement result of the flow rate measuring means. Flow rate measuring means, integrated flow rate measuring means for measuring the integrated flow rate of gas passing through the gas flow path based on the measurement result of the passing flow rate measuring means, and display means for displaying the measurement result of the integrated flow rate measuring means Thus, the gas supply pressure abnormality can be detected using the existing gas flow path in the electronic gas meter.

Further, according to the electronic gas meter of the present invention described in claim 20, according to claims 6, 7, 8, 9, 1,
An electronic gas meter incorporating the gas supply pressure abnormality detection device according to the present invention described in 0, 11, 12, 13, 14, or 15, wherein the gas flow is measured based on a time-dependent change in a measurement result of the flow velocity measuring means. A passing flow rate measuring means for measuring a passing flow rate of the gas passing through the road, and an integrated flow rate measuring means for measuring an integrated flow rate of the gas passing through the gas flow path based on a measurement result of the passing flow rate measuring means; With the configuration including the display means for displaying the measurement result of the integrated flow rate measuring means, it is possible to detect the gas supply pressure abnormality using the existing gas flow path and the flow rate measuring means in the electronic gas meter. .

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 16, claims 1, 2, 3, 4,
In the gas supply pressure abnormality detection device according to the present invention described in 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15, when there is abnormality in the gas supply pressure in the gas flow path. An abnormality determination number counting means for counting the number of times determined by the supply pressure abnormality determination means, and when the number of times counted by the abnormality determination number counting means reaches a predetermined notification execution number, The system further includes a report data generating and outputting means for generating and outputting report data for transmitting to the remote monitoring host computer via the telephone line that the supply pressure is abnormal.

Further, according to the electronic gas meter of the present invention described in claim 21, in the electronic gas meter of the present invention described in claim 19 or 20, the gas supply pressure in the gas flow path is abnormal. Abnormality determination number counting means for counting the number of times the supply pressure abnormality determination means has determined, and when the number of times the abnormality determination number counting means has reached a predetermined notification execution number, The system further includes a report data generation and output unit that generates and outputs report data for transmitting to the remote monitoring host computer via the telephone line that the gas supply pressure is abnormal.

Therefore, in both the gas supply pressure abnormality detecting device of the present invention described in claim 16 and the electronic gas meter of the present invention described in claim 21, the gas supply pressure abnormality has a certain degree of certainty. When it is detected, it notifies the remote monitoring host computer promptly,
Necessary measures can be taken at an early stage.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 17, in the gas supply pressure abnormality detecting device of the present invention described in claim 16, the abnormality determination number counting means may include: The supply pressure abnormality determination means counts the number of times that the supply pressure abnormality determination means has continuously determined that there is an abnormality in the gas supply pressure in the gas flow path.

According to the electronic gas meter of the present invention described in claim 22, in the electronic gas meter of the present invention described in claim 21, the abnormality determination frequency counting means may include a gas in the gas passage. The supply pressure abnormality determination means counts the number of times that the supply pressure abnormality determination means has continuously determined that the supply pressure is abnormal.

Therefore, in any of the gas supply pressure abnormality detecting device according to the present invention and the electronic gas meter according to the present invention, the fact that the gas supply pressure is abnormal is remotely monitored. Standards for reporting to the host computer are set strictly. If the pressure of the gas in the gas passage fluctuates periodically due to other factors, this is regarded as a gas supply pressure abnormality. It is possible to suppress and prevent the occurrence of a situation in which a false report is made by mistake, and it is possible to improve the detection accuracy of the supply pressure abnormality and, consequently, the reliability thereof.

Further, according to the gas supply pressure abnormality detecting device of the present invention described in claim 18, in the gas supply pressure abnormality detecting device of the present invention described in claim 16 or 17, the abnormality determination number counting means is provided. The number of times that the supply pressure abnormality determination means determines that the supply pressure of the gas in the gas flow path is abnormal is counted over the latest predetermined number of days.

According to the electronic gas meter of the present invention as set forth in claim 23, in the electronic gas meter of the present invention as set forth in claim 21 or 22, the means for counting the number of times of abnormality determination is provided in the gas flow path. The number of times that the supply pressure abnormality determining means determines that the supply pressure of the gas is abnormal is counted over the latest past certain number of days.

For this reason, in both the gas supply pressure abnormality detecting device according to the present invention described in claim 18 and the electronic gas meter according to claim 23, an abnormality in the gas supply pressure is detected after a while. Even in situations that occur regularly, this is reported to the remote monitoring host computer,
You can take necessary measures.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a gas supply pressure abnormality detection device according to the present invention.

FIG. 2 is a block diagram showing a basic configuration of a gas supply pressure abnormality detection device according to the present invention.

FIG. 3 is a block diagram showing a basic configuration of an electronic gas meter according to the present invention.

FIG. 4 is a block diagram showing a basic configuration of an electronic gas meter according to the present invention.

FIG. 5 is an explanatory diagram illustrating a schematic configuration of an electronic gas meter according to the first embodiment of the present invention.

6 is a flowchart showing a gas supply pressure abnormality detection process performed by a CPU according to a control program stored in a ROM of the microcomputer of FIG. 5;

FIG. 7 is a flowchart illustrating a gas supply pressure abnormality detection process performed by a CPU according to a control program stored in a ROM of a microcomputer of an electronic gas meter according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 3 gas flow path 11 microcomputer 11a CPU 11b RAM 11c ROM 11A pressure fluctuation judgment means 11B, 11G supply pressure abnormality judgment means 11C, 11H gas flow generation judgment means 11D pressure measurement cycle setting means 11E gas passage judgment means 11F flow velocity fluctuation judgment means 11J Flow velocity measurement cycle setting means 11K Passing flow rate measurement means 11L Integrated flow rate measurement means 11M Abnormality judgment number counting means 11N Report data generation output means 15 Display means PS Pressure measurement means VS Flow velocity measurement means

Continued on the front page F term (reference) 2F030 CB01 CC13 CE21 CE25 2F055 BB03 CC51 FF21 3E072 AA10 DB10 GA30 3K068 AA01 DA00

Claims (23)

[Claims] An apparatus for detecting an abnormality in a supply pressure of a regulated gas in a gas flow path, comprising: a pressure measurement unit configured to measure a pressure of a gas in the gas flow path; Pressure fluctuation determining means for determining whether there is a periodic change in the pressure of the gas in the gas flow path based on a temporal change in the measurement result of the pressure measuring means in a state where there is gas passing therethrough, In a state where the pressure fluctuation determining means determines that there is a periodic fluctuation in the pressure of the gas in the gas flow path, the supply pressure of the gas in the gas flow path is determined based on the measurement result of the pressure measuring means. A gas supply pressure abnormality detection device, comprising: a supply pressure abnormality determination unit that determines whether there is an abnormality in the gas supply pressure. 2. The supply pressure abnormality determination unit determines a difference between a maximum value and a minimum value of a periodic change in the pressure of the gas in the gas flow path determined to have the pressure change determination unit. The gas supply pressure abnormality detecting device according to claim 1, wherein when the pressure fluctuation threshold value is exceeded, it is determined that the gas supply pressure in the gas flow path is abnormal. 3. The supply pressure abnormality judging means passes through the gas flow path on which the pressure fluctuation judging means judges that there is a periodic fluctuation in the gas pressure in the gas flow path. In a state where a representative pressure value determined from a plurality of measurement results of the pressure measuring means in a state where gas is present is lower than an abnormality determination pressure value equal to or more than a lower limit value of a normal range of the supply pressure, the gas flow path The gas supply pressure abnormality detecting device according to claim 1, wherein it is determined whether or not there is an abnormality in the gas supply pressure. 4. The method according to claim 1, wherein the representative pressure value is such that the gas that passes through the gas flow path is used as a basis for determining that the pressure of the gas in the gas flow path varies periodically. 4. The gas supply pressure abnormality detection device according to claim 3, wherein the average value is a mean value of a plurality of measurement results of the pressure measurement unit in a certain state. 5. The method according to claim 5, wherein the representative pressure value is such that the gas that passes through the gas flow path is used as a basis for determining that the pressure of the gas in the gas flow path has periodic fluctuations. 4. The gas supply pressure abnormality detecting device according to claim 3, wherein the detected value is a maximum value of a plurality of measurement results of the pressure measurement unit in a certain state. 6. A flow velocity measuring means for measuring a flow velocity of a gas in the gas flow path, and detecting a generation of a gas flow in the gas flow path based on a time-dependent change in a measurement result of the flow velocity measurement means. Further comprising a gas flow generation determining means, wherein the pressure fluctuation determining means passes through the gas flow path as the gas flow generation determining means detects generation of a gas flow in the gas flow path. 6. The gas supply pressure abnormality detecting device according to claim 1, wherein it is determined whether or not there is a gas and whether or not there is a periodic change in the pressure of the gas in the gas flow path. 7. A pressure measurement cycle setting means for setting a measurement cycle for measuring a gas pressure in the gas flow path by the pressure measurement means according to a detection result of the gas flow generation determination means, 7. The gas supply pressure abnormality detecting device according to claim 6, wherein the pressure measurement cycle setting means shortens the measurement cycle as the gas flow generation determination means detects the generation of a gas flow in the gas flow path. . 8. An apparatus for detecting an abnormality in supply pressure of a regulated gas in a gas flow path, wherein the flow rate measurement means measures a flow velocity of a gas passing through the gas flow path; A gas passage determination unit that determines the presence or absence of a gas passing through the gas flow path, based on a temporal change of the measurement result, and the gas passage determination unit determines that there is a gas that passes through the gas flow path. In the state, based on a temporal change in the measurement result of the flow velocity measuring means, a flow velocity fluctuation determining means for determining whether there is a periodic fluctuation in the flow velocity of the gas passing through the gas flow path, In a state in which the flow velocity fluctuation determining means determines that there is a periodic fluctuation in the flow velocity of the gas passing through, the supply pressure of the gas in the gas flow path is abnormal based on the measurement result of the flow velocity measuring means. Supply pressure abnormality judgment to determine whether there is When the gas supply 圧異 normal detecting apparatus comprising: a. 9. The supply pressure abnormality determining means determines a difference between a maximum value and a minimum value of a periodic variation of the flow velocity of the gas passing through the gas flow path determined to have the flow rate variation determining means. 9. The gas supply pressure abnormality detecting device according to claim 8, wherein when a predetermined flow velocity fluctuation threshold value is exceeded, it is determined that there is an abnormality in the gas supply pressure in the gas flow path. 10. The supply pressure abnormality judging means passes through the gas flow path on which the flow velocity fluctuation judging means judges that there is a periodic change in the flow velocity of the gas flowing through the gas flow path. In a state where the representative flow velocity value determined from the plurality of measurement results of the flow velocity measuring means in a state where gas is present is lower than a predetermined abnormality determination flow velocity value, there is an abnormality in the gas supply pressure in the gas flow path. The gas supply pressure abnormality detection device according to claim 8, wherein the determination is made as to whether the gas supply pressure is abnormal. 11. The gas flow rate passing through the gas flow path, based on which the representative flow rate value is based on which the flow rate fluctuation determination means determines that the flow rate of the gas flowing through the gas flow path has a periodic variation. The gas supply pressure abnormality detecting device according to claim 10, wherein the gas supply pressure abnormality detecting device is an average value of a plurality of measurement results of the flow velocity measuring means in a certain state. 12. The gas flow rate passing through the gas flow path, based on which the representative flow rate value is based on which the flow rate fluctuation determination means determines that the flow rate of the gas flowing through the gas flow path has a periodic variation. The gas supply pressure abnormality detection device according to claim 10, wherein the gas supply pressure abnormality detection device is a maximum value of a plurality of measurement results of the flow velocity measurement unit in a certain state. 13. A pressure measuring means for measuring a pressure of a gas in the gas flow path, and a generation of a gas flow in the gas flow path is detected based on a temporal change of a measurement result of the pressure measuring means. Gas flow generation determining means, wherein the flow velocity variation determining means passes through the gas flow path as the gas flow generation determining means detects generation of a gas flow in the gas flow path. 13. The gas supply pressure abnormality detecting device according to claim 8, wherein it is determined whether there is a gas or not, and whether or not there is a periodic fluctuation in the flow velocity of the gas passing through the gas flow path. 14. A flow rate measuring cycle setting means for setting a measuring cycle for measuring a flow rate of a gas passing through the gas flow path by the flow rate measuring means according to a detection result of the gas flow generation determining means, The flow velocity measurement cycle setting means,
14. The gas supply pressure abnormality detecting device according to claim 13, wherein the measurement cycle is shortened as the gas flow generation determining unit detects the generation of the gas flow in the gas flow path. 15. The supply pressure abnormality determination means, wherein the gas pressure in the gas flow path measured by the pressure measurement means falls below an abnormality determination pressure value equal to or higher than a lower limit of a normal range of the supply pressure. 15. The gas supply pressure abnormality detection device according to claim 13, wherein in a state where the gas supply pressure in the gas flow path is abnormal, it is determined whether there is an abnormality. 16. An abnormality determination number counting means for counting the number of times the supply pressure abnormality determination means has determined that the supply pressure of the gas in the gas flow path is abnormal, and a number of times counted by the abnormality determination number counting means. When a predetermined number of notification executions is reached, notification data for generating and outputting notification data for sending to the remote monitoring host computer via the telephone line that there is an abnormality in the gas supply pressure in the gas flow path. And a data generation / output means.
The gas supply pressure abnormality detection device according to 8, 9, 10, 11, 12, 13, 14, or 15. 17. The abnormality determination number counting means counts the number of times the supply pressure abnormality determination means continuously determines that there is an abnormality in the gas supply pressure in the gas flow path.
The gas supply pressure abnormality detecting device according to the above. 18. The abnormality determination number counting means counts the number of times the supply pressure abnormality determination means has determined that there is an abnormality in the supply pressure of gas in the gas flow path over the latest certain number of days in the past. The gas supply pressure abnormality detecting device according to claim 16 or 17, wherein the counting is performed. 19. An electronic gas meter incorporating the gas supply pressure abnormality detection device according to claim 1, wherein the flow rate measurement means measures a gas flow rate in the gas flow path. A passing flow rate measuring means for measuring a passing flow rate of the gas passing through the gas flow path based on a temporal change of a measurement result of the flow rate measuring means; and a gas flow rate based on a measuring result of the passing flow rate measuring means. An electronic gas meter, comprising: integrated flow rate measuring means for measuring an integrated flow rate of gas passing through a road; and display means for displaying a measurement result of the integrated flow rate measuring means. 20. The method of claim 6, 7, 8, 9, 10, 11,
An electronic gas meter incorporating the gas supply pressure abnormality detection device according to claim 12, 13, 14, or 15, wherein a flow rate of the gas passing through the gas flow path is determined based on a time-dependent change in a measurement result of the flow velocity measurement means. A flow rate measuring means for measuring the flow rate, a cumulative flow rate measuring means for measuring a cumulative flow rate of the gas passing through the gas flow path based on the measurement result of the flow rate measuring means, and a measurement result of the cumulative flow rate measuring means. An electronic gas meter, comprising: display means for displaying. 21. An abnormality determination number counting means for counting the number of times the supply pressure abnormality determination means has determined that the supply pressure of the gas in the gas flow path is abnormal, and a number counted by the abnormality determination number counting means. When the predetermined number of times of execution of the notification has been reached, the notification data for generating and outputting the notification data for sending to the remote monitoring host computer via the telephone line that there is an abnormality in the gas supply pressure in the gas flow path. 21. The electronic gas meter according to claim 19, further comprising a data generation / output unit. 22. The abnormality determination number counting means counts the number of times the supply pressure abnormality determination means has continuously determined that there is an abnormality in the gas supply pressure in the gas flow path.
Electronic gas meter as described. 23. The abnormality determination frequency counting means counts the number of times the supply pressure abnormality determination means has determined that there is an abnormality in the gas supply pressure in the gas flow path over the latest predetermined number of days in the past. The electronic gas meter according to claim 21, wherein counting is performed.