JPS639251B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas pressure control device that can automatically and arbitrarily control gas pressure during gas supply, and can reliably detect and notify abnormalities in control operations.

Conventionally, three main methods have been proposed for gas pressure control, and the first method is:
This is a so-called mechanical type in which a cam with an opening degree curve is rotated once every 24 hours, and the opening degree of the pressure control valve is set according to the rotational position of the cam.The second method is This is a fixed electric type that sets the pressure control valve to a preset valve opening at a preset time, and the third type is a centralized monitoring control using a telemeter. by the way,
In both the first and second methods, it is generally configured to obtain a feedback signal regarding the valve opening from the pressure control valve and set the valve opening of the pressure control valve again based on this feedback signal. Therefore, it is also difficult to detect whether there is an abnormality in the regulator that adjusts the opening degree of the pressure control valve. On the other hand, in the centralized monitoring control system, control is started only after receiving a control start command signal, and it is difficult to detect abnormal operation before the control start command, so it cannot be said that the system is very safe.

The present invention has been made in view of the above points,
The purpose is to provide a gas pressure control device that can locally and automatically control gas pressure as desired, constantly and accurately detect abnormalities in control operation, and immediately notify in the event of an abnormality. It's about doing.

According to the present invention, the object is to provide a shaft means that can move forward and backward, a motor that moves the shaft means forward and backward, a valve control means connected to the shaft means, and a pressure data that is detected by detecting the forward and backward movement of the shaft means. a detector for outputting, a clock circuit for outputting a time signal, a memory circuit for storing set pressure data for each time zone, and data for reading the set pressure data from the memory circuit based on the time signal supplied from the clock circuit. a readout circuit;
a comparison calculation circuit that compares and calculates the set pressure data read by the data readout circuit with the pressure data from the detector and outputs a difference detection signal;
a drive circuit that operates the motor in response to the difference detection signal supplied from the comparison and calculation circuit; and a drive circuit that operates a clock based on the generation of the difference detection signal from the comparison and calculation circuit and a time signal from the clock circuit. a clock circuit that starts, stops the clock operation when the difference detection signal disappears, and outputs an alarm signal by continuing the clock operation for a certain period of time or more; and an alarm signal from the clock circuit. It consists of an alarm circuit that outputs a signal to activate an alarm device, and the valve control means adjusts the opening degree of a pressure control valve provided in the middle of the piping according to the gas pressure received through the communication port. a valve actuating means which operates to perform the operation; one surface receives a spring force determined by the advance and retreat of the shaft means; the other surface opposite to this one surface receives the gas pressure on the output side of the pressure control valve; movable septum means for receiving and moving in accordance with the received spring force and the gas pressure; and movable septum means coupled to the septum means, when said septum means is moved in a first direction; The input side of the pressure control valve and the communication port are communicated with each other in order to adjust the opening degree of the pressure control valve to either one, and the partition means is moved in a second direction opposite to the first direction. This is achieved by a gas pressure control device comprising a valve device that communicates the output side of the pressure control valve with the communication port in order to adjust the opening degree of the pressure control valve to the other side.

Next, a preferred embodiment of the present invention will be explained based on the drawings.

In Figures 1 to 4, 1 is a potentiometer provided in a pressure setting device 2, and the potentiometer 1 corresponds to the valve opening degree of the pressure control valve 3 set by the pressure setting device 2. Outputs a signal as pressure data. The pressure setting device 2 has a reversible electric motor 4, a pilot valve 5, and a valve control container 6, and opens and closes the pressure control valve 3 by operating the electric motor 4 as a motor. That is, pressure setting device 2
7 and 8 pass through the valve 5 into two chambers 9 and 1.
The diaphragms 7 and 8 are connected by a connecting member 11, and the chamber 10 is supplied with gas passing through the pressure control valve 3. , in room 9,
When the valve 12 is released from contact with the pipe 13 and the passage 14 is opened, the gas before being input to the pressure control valve 3 via the passage 14 is supplied, and the chamber 9 is in communication with a chamber 16 in the container 6 defined by a diaphragm 15, and the chambers 9 and 10 are connected to each other when the valve 12 opens the through hole 17 formed in the connecting member 11. They are communicated through holes 17. Further, in the pressure setting device 2, 18, 19, and 20 are coil springs, respectively, and the spring 18 is provided between a shaft 21 as a shaft means and the connecting member 11, and the extension force of the spring 18 is applied to the chamber 10. The connecting member 11 is urged downward against the gas pressure inside.
That is, the partition means consisting of the diaphragm 7, the diaphragm 8, and the connecting member 11 is a coil spring 18.
is urged downward by. Spring 1
9 makes the valve 12 come into contact with the connecting member 11 and opens the through hole 1
The valve 12 is urged upward in order to close the valve 7, and the valve 12, the pipe 13, and the coil spring 19 constitute a valve device. The spring 20 moves the actuating rod 22 attached to the diaphragm 15 into the chamber 16.
It is provided inside the container 6 to urge it downward against the gas pressure inside. The shaft 21 is connected to a rotating shaft 23 via a worm gear or the like, and is rotated by rotating the rotating shaft 23 in either the forward or reverse direction by the operation of the electric motor 4.
The actuating rod 22 is provided so as to be moved either up or down in order to extend or shorten the actuating rod 8.
It is provided so that the valve of the pressure control valve 3 is opened or closed by displacement in either the vertical direction due to deformation of the diaphragm 15, and as described later, the shaft 2
The pressure control valve 3 is opened and closed by moving the pressure control valve 1 in either the up or down direction. In addition, the valve control container 6,
The diaphragm 15, the coil spring 20, and the actuating rod 22 constitute valve actuating means. Therefore, the potentiometer 1 is connected to the rotating shaft 23 or the shaft 2 of the electric motor 4.
It is provided to detect the rotation amount of 1. The pressure control valve 3 is provided in the middle of the gas pipe 24, and outputs gas having a predetermined gas pressure to the output side pipe 25 in accordance with a set valve opening degree. Note that the chamber 9 and the chamber 16 are communicated through a hole 51,
When the partition means is moved downward, the holes 5
The input side of the pressure control valve 3 is connected to chamber 9 and chamber 1 through
6, and when the partition means is moved upward, the chamber 10, which is in communication with the output side of the pressure control valve 3, is connected to the chamber 9 and the chamber 1 through the through hole 17.
6. The gas pressure in the pipe 25 corresponds to the valve opening degree of the pressure control valve 3, and therefore the signal as pressure data obtained from the potentiometer 1 is
This corresponds to the gas pressure within 5. 26 is an analog-digital conversion circuit that converts the signal obtained from the potentiometer 1 into a digital electric signal;
The signal from the conversion circuit 26 is supplied to a comparison calculation circuit 27. Note that the potentiometer 1 and the analog-digital conversion circuit 26 constitute a detector.
Further, the valve control means includes a valve actuation means, a partition means, and a valve device. The comparison calculation circuit 27 compares the set pressure data read out from the storage device 29 by the data reading circuit 28 and the signal as pressure data supplied from the conversion circuit 26 using digital binary calculation to determine whether there is a difference. If there is a positive or negative difference, a difference detection signal is supplied to the drive circuit 31 via the inhibition circuit 30. The data reading circuit 28 reads the set pressure data from the storage device 29 based on the time signal supplied from the clock circuit 32 and the set pressure curve designation signal set from the outside. The clock circuit 32 generates a time signal as a read instruction signal every time the set pressure data stored in the storage device 29 is read. The storage circuit 29 stores set pressure data for each time period. For example, as shown in the set pressure curve 33 corresponding to the valve opening degree curve, the time period t ₀ to t ₃ , t ₃ at time T
In order to make the gas pressure P in the pipe 25 P ₁ , P ₂ , P ₃ and P 1 at ~t _i , t _i ~t _j and t _j ~t _o , respectively, the gas pressure _{P 1 ,}
The set pressure data corresponding to P ₂ and P ₃ is stored in the memory device 2.
It is stored in 9. In addition to the curve 33, the storage device 29 may also store set pressure data based on the set pressure curve 34, and the set pressure data based on any of the curves can be specified by the set pressure curve designation signal input to the readout circuit 28. It is becoming more and more common. Assuming that the period from time t ₀ to t _o is 24 hours, curve 33 or 34 corresponds to the set gas pressure for one day. Therefore, for example, if the usage amount in each time period within 24 hours differs depending on the season. By appropriately reading out the set pressure data according to either side of the curve for each season, it is possible to set the optimum gas pressure commensurate with the usage amount. Note that the gas pressure is set at time t ₀
Curve 33 or 3 is defined as one cycle from to _to .
It is configured to be repeated based on 4. Therefore, time t _o is time t ₀ . On the other hand, the drive circuit 31 operates the electric motor 4 of the pressure setting device 2 based on the supplied difference detection signal. Therefore, the drive circuit 31 and the pressure setting device 2 constitute an adjustment circuit that adjusts the valve opening degree of the pressure control valve 3. 35
is an OR gate that obtains the logical sum of a positive difference detection signal and a negative difference detection signal, and the output of the OR gate 35 is supplied to a rising edge detection circuit 36 and a time monitoring counting circuit 38 via an inverter 37. Ru. A positive difference detection signal is output as logic 1 from the comparison calculation circuit 27 to the signal line 39 when the gas pressure to be set is higher than the currently set gas pressure, while a negative difference detection signal is output from the comparison calculation circuit 27 to the signal line 39. is output as logic 1 from the comparison calculation circuit 27 to the signal line 40 when the gas pressure to be set is smaller than the currently set gas pressure. The rising edge detection circuit 36 detects when the output of the OR gate 35 is converted to logic 1, and outputs a counting operation start signal to the counting circuit 38.
The counting circuit 38 is supplied with clock pulses from the clock circuit 32, so that the counting circuit 38
When the counting operation start signal from the rising edge detection circuit 36 is input, the supplied clock pulses are counted, and when a certain count value is reached and an overflow state occurs, an alarm signal is output to the prohibition circuit 30 and the alarm circuit 41.

Further, when the difference detection signal from the comparison calculation circuit 27 disappears and a logic 1 signal is received from the inverter 37, the counting circuit 38 stops the counting operation and sets the count to zero. In this way, the OR gate 35, the rising edge detection circuit 36, the inverter 37, and the counting circuit 38 start clocking operation when the difference detection signal is generated from the comparison calculation circuit 27, and stop the clocking operation when the difference detection signal disappears. , constitutes a clock circuit that outputs an alarm signal by continuously performing a clock operation for a certain period of time or more. Upon receiving the alarm signal from the counting circuit 38, the prohibition circuit 30 prohibits the transmission of the difference detection signal from the comparison calculation circuit 27 to the drive circuit 31, and outputs a signal to stop the operation of the drive circuit 31. Upon receiving the alarm signal, the alarm circuit 41 outputs a signal that activates an alarm device 42, such as a lamp or a buzzer. The alarm device 42 may be attached, for example, to the outer wall 44 of the unmanned gas pressure control station 43 so that passersby or residents can be reliably and quickly informed of the abnormality.

Gas pressure control device 50 configured in this way
For example, the unmanned gas pressure control station 4
It will be installed within 3. Next, this gas pressure control device 5
To explain the operation of 0, at time t ₀ , when a time signal specifying time t ₀ is supplied from the clock circuit 32 to the readout circuit 28, the readout circuit 28 receives this time signal and a curve designation signal specified in advance. (in this specific example, it is assumed that curve 33 is specified), the set pressure data corresponding to the gas pressure P ₁ to be set at time t ₀ is read from the storage device 29, and the read set pressure data are compared. The signal is supplied to the arithmetic circuit 27.

The comparison calculation circuit 27 compares and calculates the received set pressure data with the pressure data from the conversion circuit 26 corresponding to the pressure of the gas currently being output into the pipe 25. By the way, since the gas pressure in the pipe 25 is set to P ₁ at time t _j , the comparison calculation circuit 27 does not output a difference detection signal when reading the set pressure data at time t ₀ . , the drive circuit 31 also does not operate. Further, for example, at time t ₁ two hours later and at time t ₂ four hours later, time signals defining times t ₁ and t ₂ are supplied from the clock circuit 32 to the readout circuit 28;
Since the set pressure data read at times t ₁ and t ₂ corresponds to the gas pressure P ₁ as described above, the comparison calculation circuit 27 does not output a difference detection signal.
Therefore, the drive circuit 31 also does not operate. Next, for example, at time t ₃ six hours later, a time signal specifying time t ₃ is supplied from the clock circuit 32 to the readout circuit 28, and set pressure data corresponding to the gas pressure P ₂ is read out from the memory circuit 29. Comparison calculation circuit 2
7, the comparator circuit 27 generates a difference detection signal as a logic 1 on the signal line 39. Upon generation of the difference detection signal, the rising edge detection circuit 36 supplies a counting operation start signal to the counting circuit 38, and the inverter 37 supplies a logic 0 signal to the counting circuit 38. Therefore, the counting circuit 38 is the same as the clock circuit 3.
It starts counting the clock pulses from 2 and performs a clocking operation. By the way, since the counting circuit 38 is not yet in an overflow state at this point, it does not output an alarm signal, and therefore the prohibition circuit 30 sends out the difference detection signal generated on the signal line 39 to the drive circuit 31. As a result, the drive circuit 31 is connected to the electric motor 4 of the pressure setting device 2.
It operates to operate. Here, since the gas pressure P ₂ to be set is higher than the current gas pressure P ₁ , the rotating shaft 23 of the electric motor 4 is rotated so that the shaft 21 is moved downward in order to open the pressure control valve 3 more. Rotated to move. When the shaft 21 is moved downward, the spring 18 tends to be shortened, but its extension force simultaneously overcomes the gas pressure in the chamber 10 and deforms the diaphragms 7 and 8, causing the connecting member 1
Move 1 downward. When the connecting member 11 is moved downward, the passage 14 is no longer blocked by the valve 12, and the high-pressure gas before being supplied to the pressure control valve 3 is introduced into the chamber 9 from the piping 24 through the passage 14. is also supplied to the chamber 16, thereby deforming the diaphragm 15 of the container 6 and moving the actuating member 22 upwardly against the tension force of the spring 20. When the actuating member 22 is moved upward, the pressure control valve 3 is set to a more open state, and the gas pressure within the pipe 25 gradually increases and approaches the desired gas pressure _P2 . At the same time, the signal from the potentiometer 1 that detects the amount of rotation of the rotating shaft 23 or shaft 21 of the electric motor 4, that is, the degree of opening of the pressure control valve 3 changes, and the gas pressure in the pipe 25 is set here. When the axis 21 is set to the amount of movement to make the gas pressure P ₂ and the pressure data supplied from the conversion circuit 26 to the comparison calculation circuit 27 becomes equal to the set pressure data read from the storage circuit 29 at time t ₃ , The comparison calculation circuit 27 no longer outputs the difference detection signal, the drive circuit 31 operates to stop the operation of the electric motor 4, the shaft 21 is stopped at its lowered position, and the spring 18 applies a larger force to the connecting member 11. Force downward. Next, the gas pressure in the tube 25 increases one after another until it reaches the set gas pressure _P2 , and the gas pressure in the chamber 10 overcomes the downward force of the spring 18.
When the connecting member 11 is moved upward and the valve 12 closes the passage 14, the supply of gas from the pipe 24 to the chambers 9 and 16 via the passage 14 is stopped, and the gas pressure in the chamber 16 is stopped. The actuating member 22 is stopped in its raised position by shortening the spring 20, and the valve opening of the pressure control valve 3 is set to maintain the gas pressure _P2 in the pipe 25. on the other hand,
When the difference detection signal as logic 1 disappears from the comparison calculation circuit 27, the output of the inverter 37 becomes logic 1, thereby stopping the counting operation of the counting circuit 38, that is, the clocking operation, and the counting contents are reset to zero. be done. By the way, if the difference detection signal does not disappear even after a certain period of time has passed due to some reason such as a failure of the pressure setting device 2 after the generation of the difference detection signal from the comparison calculation circuit 27, the counting circuit 38 will overflow. state and sends an alarm signal to the prohibition circuit 30 and the alarm circuit 41. That is, the counting circuit 38
outputs an alarm signal by continuously performing a clocking operation for a certain period of time or more. This continued period of time is determined by the response characteristics of the pressure setting device 2, etc., and if the response characteristics of the pressure setting device 2, etc. are good, it will be a relatively short period of time, while if the response characteristics are poor, it will be a relatively short period of time. It is set for a relatively long time. When the alarm signal is sent to the prohibition circuit 30, the prohibition circuit 30 stops sending the difference detection signal to the drive circuit 31, and immediately outputs a signal to stop the operation of the drive circuit 31. On the other hand, upon receiving the alarm signal, the alarm circuit 41 operates to activate the alarm device 42, which lights up the alarm device 42 if it is a lamp or emits a sound if it is a buzzer, thereby alerting the controller to an abnormality. inform.
The following is the same as when the control device is normal, for example
At time t _i 16 hours later, the gas pressure inside the pipe 25 is
The gas pressure inside the pipe 25 is set to P ₃ and at time t _j 20 hours later, the gas pressure inside the pipe 25 is set to P ₁ again. by the way,
At time t _j , the current gas pressure P ₃ in the pipe 25 is greater than the gas pressure P ₁ to be set, so a difference detection signal as logic 1 is generated on the signal line 40;
This difference detection signal is supplied to the drive circuit 31 via the prohibition circuit 30, whereby the electric motor 4 is reversely rotated so that the valve opening of the pressure control valve 3 becomes small, and the shaft 21 is moved upward. The downward force exerted by the spring 18 on the connecting member 11 is reduced, and the gas pressure in the chamber 10 causes the connecting member 1 to rotate.
1 is moved upward as the diaphragms 7 and 8 deform, the contact between the valve 12 and the connecting member 11 is released, the through hole 17 is opened, and a chamber having a gas pressure greater than the gas pressure in the chamber 10 is opened. 9 is introduced into chamber 10, and the gas pressure in chambers 9 and 16 is reduced. When the gas pressure in the chamber 16 decreases, the actuating member 22 is moved downward by the tension force of the spring 20, and the valve of the pressure control valve 3 is set to a more closed state, and the pipe 2
The gas pressure inside 5 is gradually decreased and approaches the gas pressure P ₁ to be set. Then, the rotating shaft 2 of the electric motor 4
3 or the signal from the potentiometer 1 that detects the amount of rotation of the shaft 21 changes, and the shaft 21 is set to the amount of movement that brings the gas pressure in the pipe 25 to the set gas pressure P ₁ ,
When the pressure data supplied from the conversion circuit 26 to the comparison calculation circuit 27 and the set pressure data read from the storage circuit 29 at time t _j become equal, the comparison calculation circuit 27 no longer outputs a difference detection signal, and the drive The circuit 31 operates to stop the operation of the electric motor 4, the shaft 21 is stopped in its raised position and the spring 18 moves the coupling member 11 with less force.
Forces downward. Further, the gas pressure in the pipe 25 gradually decreases to the set gas pressure P ₁ , the downward force of the spring 18 overcomes the gas pressure in the chamber 10, and the connecting member 11 is moved downward, causing the valve 12 to penetrate. Once the blockage of the hole 17 is achieved, the communication between the chambers 10 and 9 via the through hole 17 is blocked, the drop in gas pressure in the chamber 16 is stopped, the actuating member 22 is stopped in its lowered position, and the pressure control is stopped. The opening degree of the valve 3 is set so as to maintain the gas pressure P ₁ in the pipe 25. After adjusting the opening degree of the pressure control valve 3, the automatic control function of the pressure setting device 2 automatically adjusts the set gas pressure even if the gas pressure in the pipe 25 fluctuates depending on the amount used. is adjusted to By the way, even when the difference detection signal as logic 1 is output to the signal line 40, the counting operation start signal is output from the rising edge detection circuit 36, while the signal of logic 0 is output from the inverter 37. , counting circuit 3
8 performs counting operation. As above, the pressure setting device 2
If the difference detection signal is output for a certain period of time or more due to a failure of the counting circuit 3, and an overflow state occurs, the
8 outputs an alarm signal to the prohibition circuit 30 and the alarm circuit 41. Upon receiving the alarm signal, the prohibition circuit 30 prohibits the transmission of the difference detection signal to the drive circuit 31, and the alarm circuit 41 transmits an operation signal to the alarm device 42.

In the above specific example, the time signal is generated every two hours, but it may be generated every hour or every 30 minutes. In other time zones, time signals may be generated at irregular intervals, such as every two hours, and in this case, the set pressure data and control start time may be stored in the memory circuit in advance. Just leave it there. Further, although a potentiometer is provided to detect the amount of rotation of the shaft of the pressure setting device or the rotating shaft of the electric motor, the present invention is not limited thereto. In addition, if the purpose is only to issue a warning,
A prohibition circuit is not necessarily required.

As described above, according to the present invention, local control can be performed inexpensively and reliably, and valve opening control can be performed more accurately than with mechanical methods. Since it can be formed using a digital processing circuit, for example a microcomputer,
Miniaturization, high precision, and low cost can be achieved. Furthermore, by changing the set pressure data stored in the memory circuit, the valve opening degree can be controlled optimally, and the supply gas pressure can be set as desired. On the other hand, since it is possible to reliably detect an abnormality in control operation and immediately stop the control and notify the abnormality in the event of an abnormality, it can be an unmanned gas station with excellent safety, and can be used for centralized monitoring and control using a telemeter. In comparison, the danger can be dispersed, so even if one unmanned gas station breaks down, the other unmanned gas stations can be operated normally.

In the gas pressure control device of the present invention, the valve control means consisting of the valve actuation means, the partition means, and the valve device is connected to the electric circuit consisting of the detector, the motor, the drive circuit, etc. via the shaft means. The valve control means, which is a gas circuit, is completely separated from the electrical circuit. Therefore, the gas pressure control device of the present invention has the advantage of being extremely safe in terms of explosion protection.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an electrical system of a preferred embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams of an unmanned gas station having the embodiment shown in Fig. 1, and Fig. 4 is a set pressure curve. It is a diagram. 1... Potentiometer, 2... Pressure setting device,
3...Pressure control valve, 27...Comparison calculation circuit, 28
...Data reading circuit, 29...Storage circuit, 3
8... Counting circuit for time monitoring, 41... Alarm circuit,
42...Alarm device.

Claims (1)

[Scope of Claims] 1. A shaft means that can move forward and backward, a motor that moves the shaft means forward and backward, a valve control means connected to the shaft means, and a detection system that detects the forward and backward movement of the shaft means and outputs pressure data. a clock circuit that outputs a time signal, a memory circuit that stores set pressure data for each time zone, and a data readout circuit that reads the set pressure data from the memory circuit in accordance with the time signal supplied from the clock circuit. , a comparison calculation circuit that compares and calculates the set pressure data read out by the data readout circuit and the pressure data from the detector and outputs a difference detection signal; and the difference detection signal supplied from the comparison calculation circuit. starts the clocking operation based on the generation of the difference detection signal from the comparison calculation circuit and the time signal from the clock circuit, and starts clocking when the difference detection signal disappears. A clock circuit that outputs an alarm signal by stopping its operation and continuing to perform a clock operation for a certain period of time or more, and an alarm circuit that outputs a signal that activates an alarm device based on the alarm signal from the clock circuit. The valve control means includes a valve operating means that operates to adjust the opening degree of a pressure control valve provided in the middle of the piping according to the gas pressure received through the communication port; receives the spring force determined by the advance and retreat of the shaft means, and the other surface opposite to this one receives the gas pressure on the output side of the pressure control valve, and the received spring force and gas pressure a movable partition means that is moved in accordance with the first direction; and a movable partition means that is connected to the partition means, and when the partition means is moved in the first direction, the valve opening degree of the pressure control valve is controlled to be either large or small. The input side of the pressure control valve and the communication port are communicated to adjust the pressure to one side, and when the partition means is moved in a second direction opposite to the first direction, the valve opening of the pressure control valve is adjusted. A gas pressure control device comprising a valve device that communicates the output side of a pressure control valve with the communication port in order to adjust the magnitude of the pressure control valve to the other side. 2. The clock circuit according to claim 1, comprising a counting circuit that starts a counting operation when a difference detection signal occurs, and stops the counting operation and sets the counting content to zero when the difference detection signal disappears. Gas pressure control device. 3. The gas pressure control device according to claim 2, which outputs an alarm signal in response to an overflow of the counting circuit.