CN114323169A - Differential pressure gas flowmeter with automatic zero point calibration function and automatic calibration method - Google Patents

Abstract

The embodiment of the invention discloses a differential pressure gas flowmeter with an automatic zero calibration function and an automatic calibration method, wherein the differential pressure gas flowmeter comprises a probe, a first electromagnetic valve, a second electromagnetic valve and a differential pressure sensor; the probe is provided with a probe high-pressure end and a probe low-pressure end, the differential pressure sensor is provided with a sensor high-pressure end and a sensor low-pressure end, the differential pressure sensor is connected between the probe high-pressure end and the probe low-pressure end, the first electromagnetic valve is connected to the probe high-pressure end or the probe low-pressure end, and the second electromagnetic valve is connected with the sensor high-pressure end and the sensor low-pressure end. According to the invention, the first electromagnetic valve is connected to the high-pressure end of the probe or the low-pressure end of the probe, the second electromagnetic valve is connected to the high-pressure end of the sensor and the low-pressure end of the sensor, when the first electromagnetic valve is closed and the second electromagnetic valve is conducted, the output signal of the differential pressure sensor in the current state can be collected to carry out zero calibration, so that automatic zero calibration is realized to compensate the influence caused by the environmental temperature and the installation.

Description

Differential pressure gas flowmeter with automatic zero point calibration function and automatic calibration method

technical field

The present invention relates to a gas flowmeter, more specifically a differential pressure gas flowmeter with automatic zero point calibration function and an automatic calibration method.

Background technique

The gas flowmeter can be used in equipment such as air compressors. The measurement principle of the gas flowmeter is based on the pressure difference generated between the front and rear ends of the sensor probe after the fluid flows through the sensor probe. A differential pressure sensor is installed inside the sensor to measure differential pressure. The greater the flow rate, the greater the differential pressure generated. The gas flow rate can thus be calculated from the measured differential pressure.

Taking an air compressor as an example, the compressed air measured by the gas flow meter is located at the exhaust port of the air compressor. The air here is very humid, and the water vapor in the air can easily condense into liquid water after long-term operation. Since the differential pressure sensor is easily affected by the ambient temperature and installation angle, it is easy to cause measurement errors.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a differential pressure gas flowmeter with an automatic zero point calibration function and an automatic calibration method.

To achieve the above object, the present invention adopts the following technical solutions:

On the one hand, a differential pressure gas flowmeter with automatic zero calibration function includes a probe, a first solenoid valve, a second solenoid valve and a differential pressure sensor; the probe is configured with a probe high pressure end and a probe low pressure end, the differential pressure sensor The sensor is equipped with a high-pressure end of the sensor and a low-pressure end of the sensor, the differential pressure sensor is connected between the high-pressure end of the probe and the low-pressure end of the probe, the first solenoid valve is connected to the high-pressure end of the probe or the low-pressure end of the probe, the second The solenoid valve is connected with the high pressure end of the sensor and the low pressure end of the sensor.

A further technical solution is: the high-voltage end of the sensor and the high-voltage end of the probe are located on the same side.

A further technical solution is: the low pressure end of the sensor and the low pressure end of the probe are located on the same side.

A further technical solution thereof is as follows: it further comprises a protective shell; a receiving cavity is arranged inside the protective shell, and the first electromagnetic valve, the second electromagnetic valve and the differential pressure sensor are all received in the receiving cavity.

A further technical solution is that: the part where the probe is provided with the air guide hole is located outside the protective shell.

Its further technical scheme is: the protective shell includes a first shell and a second shell detachably connected with the first shell.

Its further technical scheme is that: the first casing and the second casing are sealedly connected through a connecting piece.

Its further technical scheme is as follows: the protective shell is made of plastic material.

On the other hand, an automatic calibration method of the above-mentioned differential pressure gas flowmeter with automatic zero point calibration function, the method includes:

Close the first solenoid valve on the high pressure end of the probe or the low pressure end of the probe;

Conducting the second solenoid valve at the high pressure end of the sensor and the low pressure end of the sensor;

Collect the output signal of the differential pressure sensor in the current state to calibrate the zero point.

Its further technical scheme is: after the output signal of the differential pressure sensor in the current state is collected for zero point calibration, the method further includes:

When the calibration is completed, turn on the first solenoid valve on the high pressure end of the probe or the low pressure end of the probe, and close the second solenoid valve on the high pressure end of the sensor and the low pressure end of the sensor.

Compared with the prior art, the present invention has the following beneficial effects: in the present invention, a first solenoid valve is connected to the high pressure end of the probe or the low pressure end of the probe, and a second solenoid valve is connected to the high pressure end of the sensor and the low pressure end of the sensor. When a solenoid valve is turned on and the second solenoid valve is turned on, the zero-point calibration can be performed by collecting the output signal of the differential pressure sensor in the current state, thereby realizing automatic zero-point calibration to compensate for the influence of ambient temperature and installation.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented in accordance with the content of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following A preferred embodiment is given, and the detailed description is as follows.

Description of drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention, which are of great significance to the art For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of a differential pressure gas flowmeter with automatic zero calibration function provided by a specific embodiment of the present invention;

2 is an exploded view of a differential pressure gas flowmeter with automatic zero calibration function provided by a specific embodiment of the present invention;

3 is a working schematic diagram of a differential pressure gas flowmeter with automatic zero calibration function provided by a specific embodiment of the present invention;

FIG. 4 is a flowchart of an automatic calibration method for a differential pressure gas flowmeter with an automatic zero point calibration function provided by a specific embodiment of the present invention.

reference number

1. Probe; 11. High-pressure end of probe; 12. Low-pressure end of probe; 13. Air hole; 2. Protective shell; 21. First shell; 22. Second shell; 3. First solenoid valve; 4. Second Solenoid valve; 5, differential pressure sensor; 51, high pressure end of sensor; 52, low pressure end of sensor.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It is to be understood that when used in this specification and claims, the terms "comprising" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and/or components, but do not exclude one or more The presence or addition of other features, integers, steps, operations, elements, components and/or sets thereof.

It should also be understood that the terminology used in the present specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural unless the context clearly dictates otherwise.

It should further be understood that, as used in this specification and the appended claims, the term "and/or" refers to and including any and all possible combinations of one or more of the associated listed items .

A specific embodiment of the present invention provides a differential pressure gas flowmeter with automatic zero calibration function, as shown in FIGS. 1 and 3 , which includes a probe 1 , a first solenoid valve 3 , a second solenoid valve 4 and a differential pressure sensor 5 ; Probe 1 is configured with probe high-voltage end 11 and probe low-voltage end 12, differential pressure sensor 5 is configured with sensor high-voltage end 51 and sensor low-voltage end 52, differential pressure sensor 5 is connected between probe high-voltage end 11 and probe low-voltage end 12, the first A solenoid valve 3 is connected to the high pressure end 11 of the probe, the second solenoid valve 4 is connected to the high pressure end 51 of the sensor and the low pressure end 52 of the sensor, and the high pressure end 51 of the sensor and the high pressure end 11 of the probe are located on the same side. The low pressure end 52 of the sensor and the low pressure end 12 of the probe are located on the same side.

During normal measurement, the first solenoid valve 3 is turned on, so that the air pressure at the high pressure end 11 of the probe can be transmitted to the sensor high pressure end 51 of the differential pressure sensor 5, and the second solenoid valve 4 is kept closed, so that the differential pressure sensor 5 Normal flow measurement is possible.

When the zero point automatic calibration is required, the first solenoid valve 3 is closed and the second solenoid valve 4 is turned on, so that the pressure between the differential pressure sensors 5 is zero, then the output of the differential pressure sensor 5 of the mobile phone can be used. Whether the signal is zero, if not, adjust the pointer of the differential pressure sensor 5 to the zero position to complete the zero point calibration.

Of course, in order to complete the process of automatic calibration, the controller needs to be used to complete, and the controller needs to be able to accept the output signal of the differential pressure sensor 5. When in the calibration state, it can be determined whether it needs to be calibrated according to the output signal. The controller can be a common controller on the market (a controller with simple data processing capability is sufficient), and the controller can be installed on the gas flow meter or in the equipment used by the gas flow meter, for example, If it is installed in the air compressor, or the air compressor has its own controller, the controller of the air compressor can be used directly.

In some embodiments, the first solenoid valve 3 can also be connected to the low pressure end 12 of the probe to achieve the same functional effect as the first solenoid valve 3 can also be connected to the high pressure end 11 of the probe.

In some embodiments, the gas flow meter further includes a protective shell 2; the protective shell 2 is provided with a receiving cavity inside, and the first solenoid valve 3, the second solenoid valve 4 and the differential pressure sensor 5 are all contained in the receiving cavity. The protective shell 2 has the functions of moisture-proof and drop-proof protection for the components housed therein.

As shown in FIG. 2 , the protective shell 2 includes a first shell 21 and a second shell 22 detachably connected to the first shell 21 . The first housing 21 and the second housing 22 are sealedly connected by a connector, and the connector may be a screw or a screw or the like. The protective shell 2 is of a split structure, and components can be easily put into it.

In this embodiment, the protective shell 2 is made of plastic material.

Of course, in order to facilitate disassembly, the first casing 21 and the second casing 22 may also be connected by a snap connection.

For the convenience of detection, the part of the probe 1 with the air guide hole 13 is located outside the protective shell 2 .

A specific embodiment of the present invention also provides an automatic calibration method using a differential pressure gas flowmeter with an automatic zero point calibration function, as shown in FIG. 3 , the method includes the following steps:

S10, close the first solenoid valve on the high pressure end of the probe or the low pressure end of the probe.

S20. Turn on the second solenoid valve at the high pressure end of the sensor and the low pressure end of the sensor.

S30, collect the output signal of the differential pressure sensor in the current state to calibrate the zero point.

During normal measurement, the first solenoid valve is turned on, so that the air pressure at the high pressure end of the probe can be transmitted to the high pressure end of the differential pressure sensor, and the second solenoid valve is kept closed, so that the differential pressure sensor can perform normal flow measurement. .

When the zero point automatic calibration is required, the first solenoid valve is closed and the second solenoid valve is turned on, so that the pressure between the differential pressure sensors is zero, then the signal output by the differential pressure sensor of the mobile phone is zero. , if it is not zero, adjust the pointer of the differential pressure sensor to the zero position to complete the zero point calibration.

By collecting the output signal of the differential pressure sensor in the current state to calibrate the zero point, automatic zero point calibration is realized to compensate for the influence of ambient temperature and installation.

In some embodiments, the following steps are further included after step S30:

S40. After the calibration is completed, turn on the first solenoid valve on the high pressure end of the probe or the low pressure end of the probe, and close the second solenoid valve on the high pressure end of the sensor and the low pressure end of the sensor.

In the present invention, a first solenoid valve is connected to the high pressure end of the probe or the low pressure end of the probe, and a second solenoid valve is connected to the high pressure end of the sensor and the low pressure end of the sensor. When the first solenoid valve is closed and the second solenoid valve is turned on, the The zero-point calibration can be done by collecting the output signal of the differential pressure sensor in the current state, thereby realizing automatic zero-point calibration to compensate for the influence of ambient temperature and installation.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed by the present invention. Modifications or substitutions should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. A differential pressure gas flowmeter with automatic zero calibration function, characterized in that it includes a probe, a first solenoid valve, a second solenoid valve and a differential pressure sensor; the probe is configured with a probe high-pressure end and a probe low-pressure end, the The differential pressure sensor is configured with a high pressure end of the sensor and a low pressure end of the sensor, the differential pressure sensor is connected between the high pressure end of the probe and the low pressure end of the probe, and the first solenoid valve is connected to the high pressure end of the probe or the low pressure end of the probe, so The second solenoid valve is connected to the high pressure end of the sensor and the low pressure end of the sensor. 2 . The differential pressure gas flowmeter with automatic zero calibration function according to claim 1 , wherein the high pressure end of the sensor and the high pressure end of the probe are located on the same side. 3 . 3 . The differential pressure gas flowmeter with automatic zero calibration function according to claim 1 , wherein the low pressure end of the sensor and the low pressure end of the probe are located on the same side. 4 . 4 . The differential pressure gas flowmeter with automatic zero point calibration function according to claim 1 , further comprising a protective shell; the protective shell is provided with a receiving cavity, the first solenoid valve, the second solenoid Both the valve and the differential pressure sensor are accommodated in the accommodation cavity. 5 . The differential pressure gas flowmeter with automatic zero-point calibration function according to claim 4 , wherein the part where the probe is provided with the air guide hole is located outside the protective shell. 6 . 6 . The differential pressure gas flowmeter with automatic zero calibration function according to claim 4 , wherein the protective casing comprises a first casing and a second casing detachably connected to the first casing. 7 . . 7 . The differential pressure gas flowmeter with automatic zero calibration function according to claim 6 , wherein the first casing and the second casing are sealedly connected by a connecting piece. 8 . 8 . The differential pressure gas flowmeter with automatic zero calibration function according to claim 7 , wherein the protective shell is made of plastic material. 9 . 9. An automatic calibration method for a differential pressure gas flowmeter with automatic zero calibration function according to any one of claims 1-8, wherein the method comprises: Close the first solenoid valve on the high pressure end of the probe or the low pressure end of the probe; Conducting the second solenoid valve at the high pressure end of the sensor and the low pressure end of the sensor; Collect the output signal of the differential pressure sensor in the current state to calibrate the zero point. 10. The automatic calibration method of the differential pressure gas flowmeter with automatic zero point calibration function according to claim 9, characterized in that, after the output signal of the differential pressure sensor is collected under the current state for zero point calibration, the method further comprises: : When the calibration is completed, turn on the first solenoid valve on the high pressure end of the probe or the low pressure end of the probe, and close the second solenoid valve on the high pressure end of the sensor and the low pressure end of the sensor.

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