A detection system and test method for indoor gas pre-meter pressure regulator

Abstract

A detection system suitable for a gas indoor pre-meter pressure regulator, including a gas supply system, an experimental gas transmission pipeline, a control pipeline, a retractable fixture system, an industrial computer, a primary pressure control device and a secondary pressure control device; the retractable fixture system includes an exhaust ball valve, a retractable pipe, a tested pressure regulator and a flow controller connected in sequence; the primary pressure control device includes a primary pressure regulating electric proportional pressure regulating valve and a primary main body throttling device; the secondary pressure control device includes a secondary pressure regulating electric proportional pressure regulating valve, a secondary main body throttling device and a bypass pipeline; the industrial computer is connected to the primary pressure regulating proportional regulating valve and the secondary proportional regulating valve through an analog output module and a data / signal transmission line to realize the transmission of analog signals, and the regulating valve is controlled by the size of the analog quantity to control the output gas pressure signal. The system has a large flow regulation range, high pressure control accuracy, small minimum flow, easy installation, and can integrate gas supply, pressure regulation, and display.

Description

Technical Field

[0001] The invention relates to the field of indoor gas pre-meter pressure regulators, and in particular to a detection system and a test method suitable for indoor gas pre-meter pressure regulators. Background Art

[0002] With the rapid population growth in China's large and medium-sized cities, residential buildings are gradually developing into high-rise buildings. The additional gas pressure caused by the elevation difference of the riser in high-rise buildings can easily cause insufficient or excessive gas pressure in users' rooms. For traditional civilian stoves and water heaters, the front-end gas supply pressure should be in the range of 1000-3000Pa. When it exceeds this range, it will lead to unstable combustion, reduced thermal efficiency, and serious safety hazards. Therefore, the solution of all indoor pressure regulation has been adopted by many gas companies, and the use of indoor pre-meter pressure regulators has become more and more widespread, and at the same time, a huge demand has been generated for related inspection equipment.

[0003] Indoor pre-meter pressure regulators have the characteristics of small flow and low pressure. During the test, as the downstream valve is opened or closed, the front-end pressure of the tested pressure regulator cannot be guaranteed in the gas supply pressure. Therefore, higher requirements are placed on the gas supply pressure control system; in addition, the test system needs to be suitable for different types of pre-meter pressure regulators. The experimental conditions are complex, requiring the test system to have a large flow adjustment range, high accuracy, and a small minimum flow; at the same time, due to the different interface forms and sizes of different types of pre-meter pressure regulators, the test system should be easy to disassemble and assemble the tested pressure regulator. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a detection system suitable for a pressure regulator before a household gas meter, which has a large flow adjustment range, high pressure control accuracy, small minimum flow, easy installation and can integrate gas supply, pressure regulation and display.

[0005] Another object of the present invention is to provide a test method for the above-mentioned detection system applicable to the pre-meter pressure regulator of indoor gas meter.

[0006] As conceived above, the technical solution of the present invention is: a detection system for a gas indoor pre-meter pressure regulator, including a gas supply system and a pipeline system, the gas supply system is composed of a pressure stabilizing buffer tank and a compressor, the pipeline system includes an experimental gas transmission pipeline and a control pipeline, and is characterized in that it also includes a retractable fixture system, an industrial computer and a pre-pressure control system composed of a primary pressure control device and a secondary pressure control device;

[0007] The retractable clamp system comprises an exhaust ball valve, a retractable tube, a voltage regulator to be tested, and a flow controller which are connected in sequence, and the cylinder drives the retractable tube to directly clamp the voltage regulator to be tested; pressure transmitters are respectively installed on the pipeline connecting the exhaust ball valve and the retractable tube and on the pipeline connecting the voltage regulator to be tested and the flow controller, and sealing members are respectively installed at both ends of the voltage regulator to be tested, and the sealing members are connected to the cylinder; the industrial computer is connected to the two pressure transmitters through a data acquisition module and a data / signal transmission line to realize the transmission of data signals and display them on the display screen of the industrial computer;

[0008] The primary pressure control device comprises a primary pressure regulating electric proportional pressure regulating valve and a primary main body throttling device, and the primary pressure regulating electric proportional pressure regulating valve is connected to the cylinder;

[0009] The secondary pressure control device comprises a secondary pressure regulating electric proportional pressure regulating valve, a secondary main body throttling device and a bypass pipeline, wherein the secondary main body throttling device is connected to the bypass pipeline composed of a ball valve;

[0010] The industrial computer is connected to the primary pressure regulating proportional control valve and the secondary pressure regulating proportional control valve through an analog output module and a data / signal transmission line to realize the transmission of analog signals, and the regulating valve is controlled by the size of the analog quantity to control the output air pressure signal;

[0011] The experimental gas transmission pipeline starts from the pressure stabilizing buffer tank, passes through the stop valve and is connected to the gas flow meter, then enters the primary pressure control device, after being reduced in pressure by the primary pressure control device, enters the secondary pressure control device, after being reduced in pressure by the secondary pressure control device, enters the retractable clamp system, then enters the pressure regulator under test, and comes out of the pressure regulator under test and is discharged to the atmosphere through the flow control valve;

[0012] The control pipeline leads out three pneumatic components, namely, a filter, a pressure regulator and an oil mist collector, from the pressure-stabilizing buffer tank. The three pneumatic components are divided into three pipelines. One pipeline enters the first-level pressure-regulating proportional control valve to reduce pressure and then enters the first-level pressure-regulating throttling device. One pipeline enters the second-level pressure-regulating proportional control valve to reduce pressure and then enters the second-level pressure-regulating throttling device and a bypass pipeline. One pipeline enters the cylinder as a power air source to drive the movable sleeve to press the pressure regulator under test.

[0013] A manual exhaust valve is installed on the pipeline connecting the secondary pressure control device and the exhaust ball valve in the retractable clamp system. The manual exhaust valve inputs an analog signal into an industrial computer through an encoder, and then the industrial computer processes the analog signal and connects it to the flow controller in the retractable clamp system through an analog output module and a data / signal transmission line.

[0014] The above-mentioned test method for the detection system of the gas indoor pre-meter pressure regulator is:

[0015] ①Installation of the voltage regulator before the indoor meter under test:

[0016] Connect the voltage regulator to be tested with the retractable clamp system so that it can be clamped smoothly, turn on the pneumatic switch to inflate the cylinder and push the retractable tube to clamp the voltage regulator to be tested;

[0017] ② Setting of experimental pressure:

[0018] A. According to the use conditions of the tested pressure regulator, choose to use the primary pressure control device or the secondary pressure control device. When the inlet pressure of the tested pressure regulator is greater than 50kPa, open the secondary pressure control bypass pipeline. When the inlet pressure of the tested pressure regulator is between 5-50kPa, close the secondary pressure control bypass pipeline.

[0019] B. Switch the primary pressure control device and the secondary pressure control device, input the pressure required for the experiment into the touch screen, and the feedback control program will automatically stabilize the pressure;

[0020] ③Test of voltage regulator performance:

[0021] Shake the manual exhaust valve and use the flow controller to change the flow rate. First, gradually increase it to the maximum experimental flow rate Q, and then gradually decrease it to zero. Select 5 flow increase points, 4 flow decrease points, and 1 zero flow point, and record their pressure and flow values.

[0022] The gas flow meter is connected with a temperature transmitter and a pressure transmitter. The industrial computer is connected with the gas flow meter and its attached temperature transmitter and pressure transmitter through a data acquisition module and a data / signal transmission line to realize the transmission of data signals. The gas flow meter converts the flow rate into the gas flow rate Q under normal pressure according to the pressure collected by the pressure transmitter. m The industrial computer converts the flow rate to the flow rate Q of the regulator inlet gas temperature of 15°C according to the temperature collected by the temperature transmitter according to formula (1) and displays it on the industrial computer display.

[0023]

[0024] The above-mentioned cylinder adopts a push-pull cylinder.

[0025] Both ends of the voltage regulator under test are respectively provided with sealing members.

[0026] A silencer is installed at the output port of the above-mentioned voltage regulator under test.

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an indoor pre-meter pressure regulator testing device which has a large flow adjustment range, high pressure control accuracy, small minimum flow, easy installation and integrates gas supply, pressure regulation and display.

[0029] 1. Wide pressure control range: This device adopts a two-stage pressure stabilization method and can detect pressure regulators with inlet pressures ranging from 0.4MPa to 5kPa.

[0030] 2. High pressure control accuracy: The pressure control adopts the closed-loop electric-pressure signal control method to stabilize the signal pressure of the input voltage stabilizing device. The input pressure signal is balanced with the pressure signal collected at the back end through the mechanical structure to control the valve opening, thereby controlling the outlet pressure.

[0031] 3. Quick operation and installation: The cylinder compression solution solves the problem of a wide variety of connectors for the pressure regulator being tested, eliminating the need to install bolts or tighten threads. The touch screen and manual exhaust valve are used to control pressure and flow, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a system according to an embodiment of the present invention.

[0033] Figure 2 It is a schematic diagram of the automatic pressure control principle of the present invention.

[0034] Among them: 1- compressor; 2- pressure stabilizing buffer tank; 3- gas flow meter; 4- temperature transmitter; 5- pressure transmitter; 6- first-stage pressure regulating proportional control valve; 7- first-stage pressure regulating throttling device; 8- second-stage pressure regulating throttling device; 9- second-stage pressure regulating proportional control valve; 10- ball valve; 11- ball valve; 12- manual exhaust valve; 13- exhaust ball valve; 14- pressure transmitter; 15- telescopic tube; 16- cylinder; 17- seal; 18- tested pressure regulator; 19- pressure transmitter; 20- flow controller; 21- signal transmission line; 22- ball valve; 23- silencer; 24- industrial computer; 25- stop valve; 26- filter; 27- pressure regulator; 28- oil mist collector. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1 The present invention is described in further detail.

[0036] like Figure 1 As shown, a detection system suitable for a pressure regulator before a gas indoor meter includes a gas supply system and a pipeline system. The gas supply system is composed of a pressure-stabilizing buffer tank and a compressor. The pipeline system includes an experimental gas transmission pipeline and a control pipeline. It also includes a retractable clamp system, an industrial computer and a forward pressure control system composed of a primary pressure control device and a secondary pressure control device.

[0037] The retractable clamp system includes an exhaust ball valve, a retractable tube, a tested pressure regulator, and a flow controller which are connected in sequence, and the cylinder drives the retractable tube to directly clamp the tested pressure regulator; pressure transmitters are respectively installed on the pipeline connecting the exhaust ball valve and the retractable tube and on the pipeline connecting the tested pressure regulator and the flow controller, and sealing members are respectively installed at both ends of the tested pressure regulator, and the sealing members are connected to the cylinder; the industrial computer is connected to the two pressure transmitters through a PLC data acquisition module and a data / signal transmission line to realize the transmission of data signals and display them on the industrial computer display screen.

[0038] A compressor 1 provides an air source, which compresses the air into a pressure-stabilizing buffer tank 2. The pressure-stabilizing buffer tank 2 is connected to two air supply pipelines; the experimental air supply pipeline provides an air source for the experiment, and the control pipeline provides an air source for the pressure control system and the cylinder. The control pipeline passes through a stop valve and enters the three pneumatic components, namely, a filter 26, a pressure regulator 27, and an oil mist collector 28. The filter 26 is used to clean the air source and can filter the moisture in the compressed air to prevent moisture from entering the device with the gas. The pressure regulator 27 can stabilize the pressure of the air source so that the air source is in a constant state, which can reduce the damage to hardware such as valves or actuators due to sudden changes in the air pressure of the air source. The oil mist collector 28 can lubricate the moving parts of the body, and can lubricate the parts that are inconvenient to add lubricating oil, thereby extending the service life of the body. The control pipeline is divided into three paths through the three pneumatic components. One path enters the first-level pressure regulating proportional control valve 6 to reduce pressure, and then enters the first-level pressure regulating throttling device 7; one path enters the second-level pressure regulating proportional control valve 9 to reduce pressure, and then enters the second-level pressure regulating throttling device 8; one path enters the cylinder 16, which serves as a power air source to drive the movable sleeve to press the pressure regulator under test.

[0039] The experimental gas transmission pipeline is connected to the gas flowmeter 3 through a stop valve, and then enters the first-level pressure regulating and throttling device 7, the second-level pressure regulating and throttling device 8 and the bypass pipeline 10 in sequence, passes through the exhaust ball valve 13, and the cylinder 16 drives the telescopic tube 15 and the seal 17 to press the tested pressure regulator 18, and is discharged into the atmosphere through the flow controller 20 and the muffler 23.

[0040] The forward pressure control system is composed of a primary pressure control device and a secondary pressure control device. The primary pressure control device includes a primary pressure regulating electric proportional pressure regulating valve and a primary main body throttling device, and the primary pressure regulating electric proportional pressure regulating valve is connected to the cylinder; the secondary pressure control device includes a secondary pressure regulating electric proportional pressure regulating valve, a secondary main body throttling device and a bypass pipeline, and the secondary main body throttling device is connected to the bypass pipeline composed of a ball valve. When testing a pressure regulator with a higher inlet pressure, the bypass pipeline is opened and only the primary pressure regulation is used. When testing a pressure regulator with a lower inlet pressure, the bypass pipeline is closed and the primary and secondary pressure regulation are used. The secondary pressure regulator can reduce the pressure to 5-50kPa.

[0041] The first-stage electric proportional control valve is connected to the industrial computer PLC data acquisition module through a signal transmission line, and a current of 4-20mA is input. By adjusting the opening of the first-stage electric proportional control valve, the gas source of 1MPa from the pressure buffer tank is reduced to 50-400kPa, and the pressure signal is input to the first-stage main throttling device. A signal pipe is connected to the downstream of the first-stage main throttling device to input the reduced pressure to the second-stage main throttling device. The opening of the throttling device is adjusted according to the difference between the two pressure signals, so that the second-stage pressure regulator can reduce the pressure to 50-400kPa.

[0042] The industrial computer 24 is connected to the gas flow meter 3 and its attached temperature transmitter 4 and pressure transmitter 5 through the PLC data acquisition module and the data / signal transmission line to realize the transmission of data signals. The gas flow meter 3 converts the flow rate into the gas flow rate Q under normal pressure according to the pressure collected by the pressure transmitter 5. m The industrial computer converts the flow rate to the flow rate Q of the pressure regulator inlet gas temperature of 15°C according to the temperature collected by the temperature transmitter 4 according to formula (1), and displays it on the industrial computer display screen.

[0043]

[0044] The industrial computer 24 is connected to the pressure transmitter 14 and the pressure transmitter 19 via a data acquisition module and a data / signal transmission line to achieve data signal transmission and display it on the industrial computer display screen.

[0045] The industrial computer 24 is connected to the primary pressure regulating proportional control valve 6 and the secondary pressure regulating proportional control valve 7 through an analog output module and a data / signal transmission line to realize the transmission of analog signals, and controls the regulating valve by the size of the analog quantity to control the output air pressure signal.

[0046] The manual exhaust valve 12 inputs the analog signal into the industrial computer 24 through the encoder, and then the industrial computer processes the analog signal and connects it to the flow controller 20 through the analog output module and the data / signal transmission line to realize the transmission of the analog signal. The opening of the flow controller is controlled by the size of the analog quantity, thereby controlling the flow through the tested voltage regulator 18. The main function of the manual exhaust valve 12 is to prevent the flow controller from leaking during use. When testing the closing pressure, the valve is closed.

[0047] The above-mentioned test method for the detection system of the gas indoor pre-meter pressure regulator is:

[0048] 1. Installation of the voltage regulator before the indoor meter under test:

[0049] Connect the voltage regulator to be tested to the retractable clamp system so that it can be clamped smoothly, turn on the pneumatic switch to inflate the cylinder 16 to push the telescopic tube 15 to clamp the voltage regulator 18 to be tested;

[0050] 2. Setting of experimental pressure

[0051] (1) According to the use conditions of the tested pressure regulator, choose to use the first-level pressure control or the second-level pressure control. When the inlet pressure of the tested pressure regulator is greater than 50kPa, open the second-level pressure control bypass pipeline ball valve 10, keep the first-level pressure regulating proportional control valve 6 working, close the second-level proportional control valve 7, and the gas enters the tested pressure regulator through the bypass pipeline; when the inlet pressure of the tested pressure regulator is between 5-50kPa, close the second-level pressure control bypass pipeline ball valve 10, keep the first-level pressure regulating proportional control valve 6 and the second-level proportional control valve 7 working, and the gas enters the tested pressure regulator 18 through the first-level pressure regulating throttling device 7 and the second-level pressure regulating throttling device 8.

[0052] (2) Select the primary and secondary pressure control procedures, and set the minimum value P of the inlet pressure of the tested regulator 1min The input is sent to the touch screen and the voltage is automatically stabilized by the feedback control program.

[0053] 3. Test of voltage regulator performance

[0054] (1) Close the exhaust ball valve 13 and open the pipeline stop valve 25 to allow gas to enter the pressure regulator under test. The automatic pressure stabilization system sets the pressure according to the input pressure setting value P 1 Perform pressure adjustment. Wait for the gas supply pressure to stabilize to the regulator inlet pressure before starting the test.

[0055] (2) Shake the manual exhaust valve and use the flow controller 20 to change the flow rate, gradually increasing it to the maximum experimental flow rate Q max , and then gradually decrease to zero. Select 5 flow increase points and 4 flow decrease points, and record their pressure values ​​P 2min and flow value Q min .

[0056] (3) Shake the manual exhaust valve 12 to close the flow controller 20, and slowly close the ball valve 22 manually. Record the closing pressure value P 2 .

[0057] (4) Select the primary and secondary pressure control procedures, and set the intermediate value P of the inlet pressure of the tested pressure regulator 18 1int Input it into the touch screen, and the pressure is automatically stabilized by the feedback control program. Repeat steps (1), (2), and (3) to obtain 5 flow increase points and 4 flow decrease points, and record their pressure values ​​P 2int and flow value Q int .

[0058] (5) Select the primary and secondary pressure control procedures, and set the maximum value P of the inlet pressure of the tested pressure regulator 18 1maxInput it into the touch screen, and the pressure is automatically stabilized by the feedback control program. Repeat steps (1), (2), and (3) to obtain 5 flow increase points and 4 flow decrease points, and record their pressure values ​​P 2max and flow value Q max .

[0059] (6) Close the pipeline stop valve 25, open the exhaust ball valve 13, shake the manual exhaust valve 12 to open the flow intimidator 20, and open the ball valve 22. Let the gas be exhausted into the atmosphere. Press the pneumatic switch to shrink the cylinder 16 and retract the telescopic tube 15 to remove the pressure regulator to be tested.

[0060] (7) According to the experimental data, the gas flow rate Q is used as the X-axis independent variable, and the outlet pressure P of the measured pressure regulator is 2 As the Y-axis dependent variable, establish a plane rectangular coordinate system and make a calculation of P under different inlet pressures. 1min , P 1int , P 1max Under the condition of the outlet pressure of the tested pressure regulator P 2 The pressure regulating accuracy AC, closing pressure SG and closing pressure zone grade SZ of the tested pressure regulator are calculated along with the gas flow rate graph.

[0061] The following is combined with Figure 2 The pressure control scheme of the present invention is further described in detail.

[0062] This control system belongs to a compound control system. A feedforward path is added to the feedback control loop of the system to form a system that combines feedforward control with feedback control. The secondary loop includes disturbances outside the main loop (the closed loop of the voltage regulator itself) in the secondary loop. The secondary loop directly selects the outlet pressure as the control variable to achieve accurate regulation of the outlet pressure.

[0063] The selection of control law is an important part of system design. For the first-order pure lag link, the control law of the controller can be selected according to the ratio of pure lag time to time constant. When the ratio is less than 0.2, P or PI control law is selected. From the process characteristics: P control law can quickly overcome the influence of disturbances and stabilize the system, but there is a residual error; PI control law can eliminate the residual error and is widely used; PD control law is suitable for occasions with large control channel time constant or capacity lag, which can improve the stability of the system and reduce dynamic deviation. However, it is not suitable for systems with large pure lag, noisy measurement signals or periodic disturbances; PID control law introduces integration on the basis of proportional control, which can eliminate the residual error, and then add differential action to improve the stability of the system. It is suitable for occasions with large control channel time constant or capacity lag and high control requirements, but the parameter setting is more complicated.

[0064] In the present invention, since pressure control accuracy and stability are the indicators we are most concerned about, and there are large interference factors in the system, the electric-pneumatic controller adopts PID control and is implemented by PLC. The computer programming implementation algorithm is as follows.

[0065] When e(k)<=100,

[0066] u(k+1)=u(k)+K p ×e(k)+K p ×T 0 / T i ×∑e(k)+K p ×T d / T 0 ×(e(k)–e(k-1));

[0067] When e(k)>100,

[0068] u(k+1)=u(k)+K p ×e(k)+K p ×T d / T0×(e(k)–e(k-1));

[0069] In order to improve the performance of the system, the PID parameters are adjusted in real time according to the deviation value and the speed of change of the deviation to adapt to the regulation effect in different situations.

[0070] When the system is in a stable state, the pressure is maintained at the set value P 1S , at this time, pressure control is disabled. When the pressure deviation ΔP=P 1 -P 1S When it is greater than a certain threshold, it is considered that the outlet pressure of the pipeline system has changed and pressure control takes effect. The pressure controller adjusts the proportional adjustment P (PI control) according to the size of ΔP until ΔP is less than the specified threshold and pressure control is disabled. See the schematic diagram of the adjustment process Figure 2 The threshold determines the pressure control accuracy that the system can provide. In the range of 10kPa to 300kPa, the pressure accuracy is controlled within 1%. For low pressure conditions (≤10kPa), the pressure control deviation should not be greater than 0.01kPa.

Claims

1. A detection system for a gas indoor pre-meter pressure regulator, comprising a gas supply system and a pipeline system, wherein the gas supply system is composed of a pressure stabilizing buffer tank and a compressor, and the pipeline system comprises an experimental gas transmission pipeline and a control pipeline, and is characterized in that: It also includes a retractable fixture system, an industrial computer, and a forward pressure control system consisting of a primary pressure control device and a secondary pressure control device; The retractable clamp system comprises an exhaust ball valve, a retractable tube, a tested pressure regulator, and a flow controller which are connected in sequence, and the cylinder drives the retractable tube to directly clamp the tested pressure regulator; pressure transmitters are respectively installed on the pipeline connecting the exhaust ball valve and the retractable tube and the pipeline connecting the tested pressure regulator and the flow controller, and the tested pressure regulator is connected to the cylinder; the industrial computer is connected to the two pressure transmitters through a data acquisition module and a data / signal transmission line to realize the transmission of data signals and display them on the display screen of the industrial computer; The primary pressure control device comprises a primary pressure regulating electric proportional pressure regulating valve and a primary main body throttling device, and the primary pressure regulating electric proportional pressure regulating valve is connected to the cylinder; The secondary pressure control device comprises a secondary pressure regulating electric proportional pressure regulating valve, a secondary main body throttling device and a bypass pipeline, wherein the secondary main body throttling device is connected to the bypass pipeline composed of a ball valve; The industrial computer is connected to the primary pressure regulating proportional control valve and the secondary pressure regulating proportional control valve through an analog output module and a data / signal transmission line to realize the transmission of analog signals, and the regulating valve is controlled by the size of the analog quantity to control the output air pressure signal; The experimental gas transmission pipeline starts from the pressure stabilizing buffer tank, passes through the stop valve and is connected to the gas flow meter, then enters the primary pressure control device, after being reduced in pressure by the primary pressure control device, enters the secondary pressure control device, after being reduced in pressure by the secondary, enters the retractable clamp system, then enters the pressure regulator under test, and comes out of the pressure regulator under test and is discharged to the atmosphere through the flow control device; The control pipeline leads out three pneumatic components, namely, a filter, a pressure regulator and an oil mist collector, from the pressure stabilizing buffer tank. The three pneumatic components are divided into three pipelines, one of which enters the primary pressure regulating proportional control valve to reduce pressure and then enters the primary pressure regulating throttling device, one of which enters the secondary pressure regulating proportional control valve to reduce pressure and then enters the secondary pressure regulating throttling device and the bypass pipeline, and one of which enters the cylinder as a power gas source to drive the movable sleeve to press the pressure regulator under test; A manual exhaust valve is installed on the pipeline connecting the secondary pressure control device and the exhaust ball valve in the retractable fixture system. The manual exhaust valve inputs an analog signal into the industrial computer through an encoder, and then the industrial computer processes the analog signal and connects it to the flow controller in the retractable fixture system through an analog output module and a data / signal transmission line; The gas flow meter is connected with a temperature transmitter and a pressure transmitter. The industrial computer is connected with the gas flow meter and its attached temperature transmitter and pressure transmitter through a data acquisition module and a data / signal transmission line to realize the transmission of data signals. The gas flow meter converts the flow rate into the gas flow rate Q under normal pressure according to the pressure collected by the pressure transmitter. m， The industrial computer converts the flow rate to the flow rate Q of the pressure regulator inlet gas temperature of 15°C according to the temperature collected by the temperature transmitter according to formula (1), and displays it on the industrial computer display screen; The above-mentioned cylinder adopts a push-pull cylinder; Both ends of the voltage regulator under test are respectively provided with sealing members, which are connected to the cylinder; A silencer is installed at the output port of the above-mentioned voltage regulator under test.

2. A testing method for a detection system for a gas indoor pre-meter pressure regulator according to claim 1, characterized in that: The steps include: ①Installation of the voltage regulator before the indoor meter under test: Connect the voltage regulator to be tested with the retractable clamp system so that it can be clamped smoothly, turn on the pneumatic switch to inflate the cylinder and push the retractable tube to clamp the voltage regulator to be tested; ② Setting of experimental pressure: A. According to the use conditions of the tested pressure regulator, choose to use the primary pressure control device or the secondary pressure control device. When the inlet pressure of the tested pressure regulator is greater than 50kPa, open the secondary pressure control bypass pipeline. When the inlet pressure of the tested pressure regulator is between 5-50kPa, close the secondary pressure control bypass pipeline. B. Switch the primary pressure control device and the secondary pressure control device, input the pressure required for the experiment into the touch screen, and the feedback control program will automatically stabilize the pressure; ③Test of voltage regulator performance: Shake the manual exhaust valve and use the flow controller to change the flow rate. First, gradually increase it to the maximum experimental flow rate Q, and then gradually decrease it to zero. Select 5 flow increase points, 4 flow decrease points, and 1 zero flow point, and record their pressure and flow values.

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