Dual-mode industrial gas meter sealing performance detection device

Abstract

The utility model relates to a dual-mode industrial gas meter sealing performance detection device. The system is characterized by comprising a pressure regulating valve, a precision numerical control proportional valve, a fin type heat exchanger, a standard end pressure sensor, a standard end exhaust valve, a gas storage tank, a detection end inflation valve, a standard end inflation valve, a communication valve, a standard end differential pressure detection valve, a detection end differential pressure detection valve, a detection end flow detection valve, a standard end flow detection valve, a differential pressure sensor and a mass flow sensor, the detection end air inlet valve, the detection end air outlet valve, the detection end exhaust valve and the detection end pressure sensor are connected in a matched mode through pipelines. According to the device, a single differential pressure method detection mode or a mass flow method detection mode can be selected, and the two detection modes can also be selected to operate at the same time. When the two detection modes are adopted, the accuracy of the detection result can be improved, meanwhile, the characteristic that the two detection modes need to be pressurized and balanced is utilized, the workpiece only needs to be pressurized and balanced once when the two detection modes are operated, and the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a dual-mode industrial gas meter sealing performance testing device. Background Technology

[0002] Sealing performance is a key performance indicator for industrial gas meters, significantly impacting their safe operation. However, industrial gas meters, compared to residential gas meters, are larger and come in more diverse sizes, making multi-channel differential pressure comparison methods unsuitable for screening. Therefore, traditional industrial gas meter sealing testing often employs a single, dual-end differential pressure method. This method involves simultaneously pressurizing both the standard gas tank and the tested workpiece, observing the pressure difference after balancing, and calculating the leakage rate based on the workpiece volume to assess its sealing performance. This method suffers from drawbacks such as significant volume differences between the standard and testing ends, and substantial influence from test pressure and environmental conditions. In contrast, the mass flow rate method directly reflects the gas leakage rate of the tested workpiece, with no impact from test pressure or workpiece volume. However, it is susceptible to pressure fluctuations and has low testing efficiency. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of this utility model is to provide a technical solution for a dual-mode industrial gas meter sealing test device.

[0004] The dual-mode industrial gas meter sealing test device is characterized by comprising a pressure regulating valve, a precision CNC proportional valve, a finned heat exchanger, a standard end pressure sensor, a standard end exhaust valve, a gas storage tank, a detection end charging valve, a standard end charging valve, a connecting valve, a standard end differential pressure detection valve, a detection end differential pressure detection valve, a detection end flow detection valve, a standard end flow detection valve, a differential pressure sensor, a mass flow sensor, a detection end inlet valve, a detection end outlet valve, a detection end exhaust valve, and a detection end pressure sensor, all connected by pipelines. High-pressure gas is connected to the finned heat exchanger via the pressure regulating valve and the precision CNC proportional valve. The finned heat exchanger is connected to the detection end inlet valve and the detection end outlet valve via the detection end charging valve. The finned heat exchanger is charged via the standard end. The valve is connected to the gas storage tank, which is equipped with a standard end pressure sensor. The gas storage tank is connected to the outside atmosphere through the standard end exhaust valve. The gas storage tank is connected to the detection end inlet valve and the detection end outlet valve through the connecting valve. The detection end outlet valve is connected to the outside atmosphere through the detection end exhaust valve. The differential pressure sensor is connected in parallel across the connecting valve through the standard end differential pressure detection valve and the detection end differential pressure detection valve. The mass flow sensor is connected in parallel across the differential pressure sensor through the detection end flow detection valve and the standard end flow detection valve. The detection end inlet valve and the detection end outlet valve are connected to the workpiece being inspected. A detection end pressure sensor is installed on the pipeline between the workpiece being inspected and the detection end inlet valve. A detection end exhaust valve is installed between the detection end outlet valve and the workpiece being inspected.

[0005] The dual-mode industrial gas meter sealing test device is characterized in that the precision numerical control proportional valve is used to output a stable and accurate test pressure as required.

[0006] The dual-mode industrial gas meter sealing test device is characterized in that the finned heat exchanger is used to exchange heat between the gas output from the precision numerical control proportional valve and the ambient atmosphere.

[0007] The dual-mode industrial gas meter sealing test device is characterized in that the standard end pressure sensor is used to collect the gas pressure of the gas storage tank.

[0008] The dual-mode industrial gas meter sealing test device is characterized in that the standard end exhaust valve is used to release pressure and exhaust gas from the gas storage tank after the test is completed.

[0009] The dual-mode industrial gas meter sealing test device is characterized in that the differential pressure sensor is used to collect the pressure difference between the gas storage tank and the workpiece under test at the test end.

[0010] The dual-mode industrial gas meter sealing test device is characterized in that the mass flow sensor is used to collect the minute gas flow between the gas storage tank and the workpiece under test at the test end.

[0011] The dual-mode industrial gas meter sealing test device is characterized in that the exhaust valve at the test end is used to release pressure and exhaust gas from the tested workpiece at the test end after the test is completed.

[0012] The dual-mode industrial gas meter sealing test device is characterized in that the pressure sensor at the test end is used to collect the gas pressure of the workpiece being tested at the test end.

[0013] This device allows for flexible selection of testing schemes based on testing needs. It can choose between a single differential pressure method or a mass flow rate method, or it can simultaneously operate both methods. Using both methods improves the accuracy of the test results. Furthermore, by utilizing the fact that both methods require pressurization and balancing, only one pressurization and balancing operation is needed on the workpiece when operating both methods, thus improving testing efficiency.

[0014] Advantages of this utility model:

[0015] 1. Differential pressure sensors and mass flow sensors can be used to realize the sealing performance detection in two modes: differential pressure method and mass flow method, respectively;

[0016] 2. The main control unit can be used to configure the valves of the detection gas path, and the differential pressure method and mass flow method can be used to test the different requirements of the gas path;

[0017] 3. The main control unit can be used to configure the testing process and flexibly select the testing mode, which improves the accuracy of the test results while ensuring testing efficiency.

[0018] 4. A precision numerical control pressure regulating valve can be used to achieve step-by-step pressurization during the testing process, reducing the impact of gas expansion and minimizing gas disturbance in the detection gas path;

[0019] 5. A finned heat exchanger is connected in series in the detection gas path to fully exchange heat between the gas source and the detection environment, reducing the impact of temperature changes on the detection. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] To address the shortcomings of traditional testing methods, this invention provides a dual-mode industrial gas meter sealing performance testing device. This device employs two sealing performance testing modes: differential pressure method and mass flow method. When the standard end differential pressure detection valve and the detection end differential pressure detection valve are open, and the detection end flow detection valve and the standard end flow detection valve are closed, the differential pressure sensor collects the pressure difference between the gas storage tank and the detection end to determine the sealing performance of the gas meter under test. When the standard end differential pressure detection valve and the detection end differential pressure detection valve are open, and the detection end flow detection valve and the standard end flow detection valve are open, a mass flow sensor simultaneously collects the minute gas flow rate between the gas storage tank and the detection end to detect the sealing performance of the gas meter under test.

[0023] This utility model comprises a pressure regulating valve 1, a precision numerical control proportional valve 2, a finned heat exchanger 3, a standard end pressure sensor 4, a standard end exhaust valve 5, an air storage tank 6, a detection end charging valve 7, a standard end charging valve 8, a connecting valve 9, a standard end differential pressure detection valve 10, a detection end differential pressure detection valve 11, a detection end flow detection valve 12, a standard end flow detection valve 13, a differential pressure sensor 14, a mass flow sensor 15, a detection end inlet valve 16, a detection end outlet valve 17, a detection end exhaust valve 18, and a detection end pressure sensor 19 connected by pipelines. High-pressure gas is connected to pressure regulating valve 1. Pressure regulating valve 1, precision CNC proportional valve 2, and finned heat exchanger 3 are connected in series. Finned heat exchanger 3 is connected to detection end charging valve 7, detection end inlet valve 16, and detection end outlet valve 17. Finned heat exchanger 3 is connected to gas storage tank 6 through standard end charging valve 8. Standard end pressure sensor 4 is connected to gas storage tank 6. Gas storage tank 6 is connected to detection end inlet valve 16 and detection end outlet valve 17 through connecting valve 9. Detection end workpiece is connected between detection end inlet valve 16 and detection end outlet valve 17. Gas storage tank 6 is connected to the outside atmosphere through standard end exhaust valve 5. Detection end outlet valve 17 is connected to the outside atmosphere through detection end exhaust valve 18. Differential pressure sensor 14 is connected in parallel to connecting valve 9 through standard end differential pressure detection valve 11 and detection end differential pressure detection valve 10. Mass flow sensor 15 is connected in parallel to differential pressure sensor 14 through detection end flow detection valve 12 and standard end flow detection valve 13.

[0024] The precision CNC proportional valve 2 can accurately adjust and measure the output gas pressure. The finned heat exchanger 3 can exchange heat between the gas output from the precision CNC proportional valve and the ambient atmosphere. The standard end pressure sensor 4 can collect the gas pressure of the gas storage tank 6. The standard end exhaust valve 5 can release the pressure of the gas storage tank after the test. The differential pressure sensor 14 can collect the pressure difference between the gas storage tank 6 and the workpiece under test at the detection end. The mass flow sensor 15 can collect the small gas flow between the gas storage tank 6 and the workpiece under test at the detection end. The detection end exhaust valve 18 can release the pressure of the workpiece under test at the detection end after the test. The detection end pressure sensor 19 can collect the gas pressure of the workpiece under test at the detection end.

[0025] Specifically, pressure regulating valve 1 is a manual pressure regulating valve, connected to precision CNC proportional valve 2 via a pipeline, reducing the high-pressure gas source pressure to the allowable input pressure of precision CNC proportional valve 2. Precision CNC proportional valve 2 is connected to finned heat exchanger 3 via a pipeline, outputting the required stable and accurate test pressure as needed. Finned heat exchanger 3 exchanges heat between the gas output from precision CNC proportional valve 2 and the ambient atmosphere. Finned heat exchanger 3 is connected to the workpiece under test and the standard end via the test end charging valve 7 and the standard end charging valve 8, respectively. At the test end, the test end inlet valve 16 and the test end outlet valve 17 are connected to the gas inlet and outlet of the workpiece under test (the tested industrial gas meter), respectively. Simultaneously, a test end pressure sensor 19 is connected to the test end inlet valve 16 to measure the gas pressure of the workpiece under test, and a test end exhaust valve 18 is connected to the test end outlet valve 17 for depressurizing and venting the workpiece after testing. The standard end inflation valve 8 is connected to the gas storage tank 6, which is also connected to the standard end pressure sensor 4 to collect the gas pressure. The gas storage tank 6 is also connected to the standard end exhaust valve 5 for depressurization and venting at the standard end after testing. The detection end inflation valve 7 and the standard end inflation valve 8 are connected via a connecting valve 9. The differential pressure sensor 14 is connected to the connecting valve 9 via the standard end differential pressure detection valve 10 and the detection end differential pressure detection valve 11 to measure the pressure difference between the detection end and the gas storage tank 6. The mass flow sensor 15 is connected to the differential pressure sensor 14 via the detection end flow detection valve 12 and the standard end flow detection valve 13 to measure the minute gas flow rate between the detection end and the gas storage tank 6.

[0026] A dual-mode industrial gas meter sealing performance testing device can perform testing in both differential pressure and mass flow rate modes. The differential pressure testing mode consists of four stages: pressurization, balancing, testing, and depressurization. The mass flow rate mode consists of five stages: gas storage, pressurization, balancing, testing, and depressurization.

[0027] In differential pressure detection mode, firstly, the standard end exhaust valve 5 and the detection end exhaust valve 18 are closed, while the detection end inflation valve 7, the standard end inflation valve 8, the connecting valve 9, the detection end inlet valve 16, and the detection end outlet valve 17 are opened, ensuring the entire detection system is in a sealed state, internally connected and isolated from the outside atmosphere. Then, the standard end differential pressure detection valve 10, the detection end differential pressure detection valve 11, the detection end flow detection valve 12, and the standard end flow detection valve 13 are closed, disconnecting the differential pressure sensor 14 and the mass flow sensor 15 from the detection system to prevent damage to the sensors due to excessive pressure difference between the detection end and the gas storage tank 6 during the inflation phase.

[0028] In the differential pressure detection mode, during the pressurization stage, the precision CNC proportional valve 2 gradually increases the output pressure to the required detection pressure. At this time, the high-pressure gas enters the finned heat exchanger 3 through the pressure regulating valve 1 and the precision CNC proportional valve 2. During this period, the gas volume expands and the temperature decreases accordingly. In the finned heat exchanger 3, the cooled gas source gas exchanges heat with the atmosphere in the detection environment and recovers to a temperature close to that of the detection environment. After passing through the detection end inflation valve 7, it enters the workpiece to be inspected at the detection end through the detection end inlet valve 16 and the detection end outlet valve 17, respectively. At the same time, it enters the gas storage tank 6 through the standard end inflation valve 8.

[0029] In the differential pressure testing mode, during the balancing stage, the inflation valve 7 at the testing end and the inflation valve 8 at the standard end are closed, disconnecting the entire testing system from the gas source. At this time, the testing end and the gas storage tank 6 are connected by the connecting valve 9, and their pressure zones are consistent. The pressure sensors 4 at the standard end and 19 at the testing end can respectively collect the pressure between the gas storage tank 6 and the testing end. If there is a significant leak at the testing end, it can be reflected by the pressure difference between the two, allowing the defective workpiece to be identified without proceeding to the next testing stage. When the balancing stage ends and the pressure difference between the inspected workpiece at the testing end and the gas storage tank 6 meets the requirements, the testing stage can begin.

[0030] In differential pressure detection mode, during the detection phase, the connecting valve 9 is closed, disconnecting the detection end from the gas storage tank 6. Simultaneously, the standard end differential pressure detection valve 10 and the detection end differential pressure detection valve 11 are opened, connecting the differential pressure sensor 14 to the detection system. If the workpiece being tested at the detection end has a leak, its internal pressure will gradually decrease. Since the gas storage tank 6 is a sealed component, its internal pressure is only affected by temperature, thus creating a pressure difference between it and the workpiece being tested. The differential pressure sensor 14 collects the pressure difference value to assess the leakage situation of the workpiece.

[0031] In the differential pressure detection mode, during the pressure relief stage, the detection end inflation valve 7 and the standard end inflation valve 8 are closed, while the connecting valve 9, the standard end exhaust valve 5, and the detection end exhaust valve 18 are opened, connecting the detection system to the outside atmosphere and releasing the detection pressure to atmospheric pressure, thus ending the entire detection process.

[0032] In the mass flow rate method detection mode, firstly, the standard end exhaust valve 5, the detection end exhaust valve 18, the detection end inflation valve 7, the connecting valve 9, the detection end inlet valve 16, and the detection end outlet valve 17 are closed, while the standard end inflation valve 8 is opened, ensuring the entire detection system is in a sealed state, internally connected and isolated from the outside atmosphere. Then, the standard end differential pressure detection valve 10, the detection end differential pressure detection valve 11, the detection end flow rate detection valve 12, and the standard end flow rate detection valve 13 are closed, disconnecting the differential pressure sensor 14 and the mass flow rate sensor 15 from the detection system to prevent damage to the sensors due to excessive pressure difference between the detection end and the gas storage tank 6 during the inflation phase.

[0033] In the mass flow method detection mode, the precision numerical control proportional valve 2 gradually increases the output pressure to the pressure required for detection during the gas storage stage. At this time, the high-pressure gas enters the finned heat exchanger 3 through the pressure regulating valve 1 and the precision numerical control proportional valve 2. During this period, the gas volume expands and the temperature decreases accordingly. The cooled gas source gas in the finned heat exchanger 3 exchanges heat with the atmosphere in the detection environment and recovers to a temperature close to that of the detection environment. Then, it enters the gas storage tank 6 through the standard end charging valve 8.

[0034] During the pressurization phase of the mass flow method detection mode, the standard end inflation valve 8 is closed, disconnecting the entire detection system from the gas source. The connecting valve 9 is opened, and the high-pressure gas in the gas storage tank 6 enters the workpiece under inspection through the connecting valve 9 and the detection end inlet valve 16 and the detection end outlet valve 17, respectively.

[0035] In the mass flow method detection mode, during the balancing stage, the pressure between the gas storage tank 6 and the detection end can be collected by the standard end pressure sensor 4 and the detection end pressure sensor 19, respectively. Since the workpiece being inspected at the detection end and the gas storage tank 6 are connected by the connecting valve 9 at this time, if there is no obvious leakage in the workpiece, the pressures of the two will tend to be consistent, and the pressures between the gas storage tank 6 and the detection end can be collected by the standard end pressure sensor 4 and the detection end pressure sensor 19, respectively. If there is obvious leakage at the detection end, it can be reflected by the pressure difference between the two, allowing the defective workpiece to be identified without proceeding to the next detection stage. When the balancing stage ends and the pressure difference between the detection end and the gas storage tank 6 meets the requirements, the detection stage can begin.

[0036] In the mass flow method detection mode, the connecting valve 9 is closed during the detection phase, disconnecting the detection end from the gas storage tank 6. Simultaneously, the standard end differential pressure detection valve 10, the detection end differential pressure detection valve, the detection end flow detection valve 12, and the standard end flow detection valve 13 are opened. The mass flow sensor 15 is then connected to the detection system to collect the minute gas flow between the workpiece under test at the detection end and the gas storage tank. This allows for the evaluation of the sealing performance of the spare workpiece at the detection end.

[0037] In the mass flow method detection mode, during the pressure relief stage, the detection end inflation valve 7 and the standard end inflation valve 8 are closed, while the connecting valve 9, the standard end exhaust valve 5, and the detection end exhaust valve 18 are opened, connecting the detection system to the outside atmosphere and releasing the detection pressure to atmospheric pressure; the entire detection process ends.

Claims

1. A dual-mode industrial gas meter sealing performance testing device, characterized in that... The system comprises a pressure regulating valve, a precision CNC proportional valve, a finned heat exchanger, a standard end pressure sensor, a standard end exhaust valve, a gas storage tank, a detection end charging valve, a standard end charging valve, a connecting valve, a standard end differential pressure detection valve, a detection end differential pressure detection valve, a detection end flow detection valve, a standard end flow detection valve, a differential pressure sensor, a mass flow sensor, a detection end inlet valve, a detection end outlet valve, a detection end exhaust valve, and a detection end pressure sensor, all connected via piping. High-pressure gas is connected to the finned heat exchanger via the pressure regulating valve and the precision CNC proportional valve. The finned heat exchanger is connected to the detection end inlet valve and the detection end outlet valve via the detection end charging valve. The finned heat exchanger is connected to the gas storage tank via the standard end charging valve. The gas storage tank is equipped with... A standard end pressure sensor is installed. The gas storage tank is connected to the outside atmosphere through the standard end exhaust valve. The gas storage tank is connected to the detection end inlet valve and the detection end outlet valve through the connecting valve. The detection end outlet valve is connected to the outside atmosphere through the detection end exhaust valve. The differential pressure sensor is connected in parallel across the connecting valve through the standard end differential pressure detection valve and the detection end differential pressure detection valve. The mass flow sensor is connected in parallel across the differential pressure sensor through the detection end flow detection valve and the standard end flow detection valve. The detection end inlet valve and the detection end outlet valve are connected to the workpiece being inspected. A detection end pressure sensor is installed on the pipeline between the workpiece being inspected and the detection end inlet valve. A detection end exhaust valve is installed between the detection end outlet valve and the workpiece being inspected.

2. The dual-mode industrial gas meter sealing performance testing device according to claim 1, characterized in that... The precision CNC proportional valve is used to output stable and accurate test pressure as required.

3. The dual-mode industrial gas meter sealing performance testing device according to claim 1, characterized in that... The finned heat exchanger is used to exchange heat between the gas output from the precision numerical control proportional valve and the ambient atmosphere.

4. The dual-mode industrial gas meter sealing performance testing device according to claim 1, characterized in that... The standard end pressure sensor is used to collect the gas pressure of the gas storage tank.

5. The dual-mode industrial gas meter sealing performance testing device according to claim 1, characterized in that... The standard end exhaust valve is used to release pressure and vent air from the storage tank after the test is completed.

6. The dual-mode industrial gas meter sealing performance testing device according to claim 1, characterized in that... The differential pressure sensor is used to collect the pressure difference between the gas storage tank and the workpiece being inspected at the detection end.

7. The dual-mode industrial gas meter sealing performance testing device according to claim 1, characterized in that... The mass flow sensor is used to collect minute gas flow rates between the gas storage tank and the workpiece being inspected at the detection end.

8. The dual-mode industrial gas meter sealing performance testing device according to claim 1, characterized in that... The exhaust valve at the detection end is used to release pressure and exhaust air from the workpiece at the detection end after the detection is completed.

9. The dual-mode industrial gas meter sealing performance testing device according to claim 1, characterized in that... The pressure sensor at the detection end is used to collect the gas pressure of the workpiece being inspected at the detection end.

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