Automatic control device for pressure test

Abstract

The utility model provides an automatic control device for pressure test, which comprises a detection gas source assembly, a pressure detection piece, a tracer gas concentration sensor and a control unit, the detection gas source assembly comprises a gas source storage tank, a pipeline and a control piece, the gas source storage tank is connected with a container to be tested through the pipeline, the control piece is connected in series on the pipeline, and the tracer gas concentration sensor is connected with the control piece. The pressure detection piece is connected with the to-be-detected container, and the tracer gas concentration sensor is arranged on the outer side of the to-be-detected container. The control part, the pressure detection part and the tracer gas concentration sensor are electrically connected with the control unit, and when a pressure test and an air tightness test are carried out on the to-be-detected container, the control unit controls the control part to be opened, so that detection gas containing tracer gas in the gas source storage tank enters the to-be-detected container; the tracer gas concentration sensor detects the concentration of tracer gas outside the to-be-detected container, when the concentration of the tracer gas exceeds a set value, it is indicated that leakage exists in the to-be-detected container, and the control unit controls the control part to be closed. Through the arrangement, the pressure test automatic control device can automatically detect the to-be-tested container, and the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of tank testing equipment, and in particular to an automatic control device for pressure testing. Background Technology

[0002] In the production of storage tanks, equipment required for pressure and airtightness testing must, according to regulations, be gradually pressurized in 10% increments and leak-checked during the pressurization process. In actual operation, pressure is monitored using pressure gauges, and the pressurization is performed manually. Leak detection involves operators applying foaming agent to the leak-prone areas. Therefore, the existing methods for conducting pressure and airtightness tests on storage tanks are inefficient. Utility Model Content

[0003] The purpose of this invention is to solve the problem of low efficiency in existing methods for conducting pressure tests and airtightness tests on storage tanks.

[0004] To address the aforementioned technical problems, this utility model provides an automatic control device for pressure testing, used for performing pressure and airtightness tests on a container under test. The automatic control device includes a detection gas source assembly, a pressure detection element, a tracer gas concentration sensor, and a control unit. The detection gas source assembly includes a gas source storage tank, a pipeline, and a control unit. The gas source storage tank stores detection gas, which includes at least tracer gas. The pipeline connects the gas source storage tank and the container under test. The control unit is connected in series with the pipeline to control its opening and closing. The pressure detection element communicates with the interior of the container under test to detect the internal gas pressure. The tracer gas concentration sensor is located on the outside of the container under test to detect the concentration of tracer gas leaking outside the container. The control unit is electrically connected to the control unit, the pressure detection element, and the tracer gas concentration sensor. The control unit adjusts the opening of the control unit based on the electrical signal from the pressure detection element, and also controls the control unit to close based on the electrical signal from the tracer gas concentration sensor.

[0005] In some embodiments of this application, the gas source storage tank includes a tracer gas storage tank and a pressurized gas storage tank; the pipeline includes a first pipeline and a second pipeline; the control component includes a first control component and a second control component, both of which are electrically connected to the control unit; one end of the first pipeline is connected to the tracer gas storage tank, and the other end is connected to the container under test; the first control component is connected in series with the first pipeline to control the on / off state of the first pipeline; one end of the second pipeline is connected to the pressurized gas storage tank, and the other end is connected to the container under test; the second control component is connected in series with the second pipeline to control the on / off state of the second pipeline.

[0006] In some embodiments of this application, the first control element is a flow control valve, which is capable of detecting the flow rate of gas from the tracer gas storage tank to the test container and adjusting the flow rate of the pipeline between the tracer gas storage tank and the test container; and / or, the second control element includes a pressure regulating valve and a shut-off valve, the pressure regulating valve is used to adjust the flow rate of the pipeline between the pressure gas storage tank and the test container, and the shut-off valve is disposed between the pressure regulating valve and the pressure gas storage tank to control the opening and closing of the second pipeline, and both the pressure regulating valve and the shut-off valve are electrically connected to the control unit.

[0007] In some embodiments of this application, the pipeline further includes a third pipeline connected to the test container. The end of the first pipeline away from the tracer gas storage tank and the end of the second pipeline away from the pressure gas storage tank are both connected to the third pipeline, so that the tracer gas in the first pipeline and the pressure gas in the second pipeline are mixed at the third pipeline and then enter the test container.

[0008] In some embodiments of this application, the detection gas source assembly further includes a first one-way valve and a second one-way valve. The first one-way valve is connected in series with the first pipeline, so that the gas in the first pipeline can only flow from the tracer gas storage tank to the container under test. The second one-way valve is connected in series with the second pipeline, so that the gas in the first pipeline can only flow from the pressure gas storage tank to the container under test.

[0009] In some embodiments of this application, the tracer gas is helium or a halogen gas; the pressurized gas is air, nitrogen, or argon.

[0010] In some embodiments of this application, the gas pressure in the gas source tank is greater than the gas pressure required for the test container to be tested, so that the test gas in the gas source tank can spontaneously flow to the test container; or, the test gas source assembly further includes a booster pump, which is connected in series to the pipeline and electrically connected to the control unit, and the booster pump is used to increase the pressure of the test gas so that the test gas can flow to the test container.

[0011] In some embodiments of this application, multiple tracer gas concentration sensors are configured, and the multiple tracer gas concentration sensors are distributed at intervals on the circumferential outer side of the container to be tested, and all of the multiple tracer gas concentration sensors are electrically connected to the control unit.

[0012] In some embodiments of this application, the automatic control device for pressure testing further includes an exhaust assembly, which includes an exhaust pipe and an exhaust control valve. One end of the exhaust pipe is connected to the container under test, and the other end is connected to an external detection gas recovery system or the external environment. The exhaust control valve is connected in series with the exhaust pipe and electrically connected to the control unit. The exhaust control valve is used to control the opening and closing of the exhaust pipe.

[0013] In some embodiments of this application, the exhaust assembly further includes a muffler connected in series with the exhaust pipe and located on the side of the exhaust control valve away from the container under test.

[0014] In some embodiments of this application, the automatic control device for pressure testing further includes a camera and a storage unit. The camera is disposed on the outside of the container under test and is electrically connected to the storage unit. The camera is used to acquire the test image of the container under test, and the storage unit is used to store the test image acquired by the camera.

[0015] As can be seen from the above technical solution, the beneficial effects of this utility model are as follows:

[0016] The automatic pressure test control device of this application includes a detection gas source assembly, a pressure detection element, a tracer gas concentration sensor, and a control unit. The detection gas source assembly includes a gas source storage tank, pipelines, and a control unit. The gas source storage tank is connected to the container under test via the pipeline, the control unit is connected in series with the pipeline, the pressure detection element is connected to the container under test, and the tracer gas concentration sensor is located on the outside of the container under test. The control unit, pressure detection element, and tracer gas concentration sensor are all electrically connected to the control unit. During pressure and airtightness tests on the container under test, the control unit controls the control unit to open, allowing the detection gas containing the tracer gas from the gas source storage tank to enter the container under test. The tracer gas concentration sensor detects the concentration of the tracer gas on the outside of the container under test. When the concentration of the tracer gas exceeds a set value, it indicates a leak in the container under test, and the control unit controls the control unit to close. Through this configuration, the automatic pressure test control device can automatically detect the container under test, improving testing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an automatic control device for pressure testing in one embodiment.

[0018] Figure 2 This is a schematic diagram of the detection gas source component in one embodiment.

[0019] The reference numerals in the attached drawings are explained as follows: 1-Detection gas source component; 11-Gas source storage tank; 12-Pipeline; 13-Control component; 111-Tracer gas storage tank; 112-Pressure gas storage tank; 121-First pipeline; 122-Second pipeline; 123-Third pipeline; 131-First control component; 132-Second control component; 1321-Pressure regulating valve; 1322-Stop valve; 14-First check valve; 15-Second check valve; 17-Manual control valve; 2-Exhaust assembly; 21-Exhaust pipeline; 22-Exhaust control valve; 23-Silencer; 3-Pressure detection component; 31-Pressure transmitter; 32-Pressure gauge; 4-Control unit; 51-Tracer gas concentration sensor; 52-Tracer gas concentration detection module; 61-Camera; 62-Storage unit; 20-Container under test. Detailed Implementation

[0020] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0021] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back) are merely for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In addressing the inefficiency of existing pressure and airtightness tests on storage tanks, pressure is monitored using pressure gauges and manually increased, while leak detection involves workers applying foaming agent to the leak points. This approach aims to provide an automated pressure testing device that reduces worker workload and improves testing efficiency and accuracy, particularly for large storage tanks.

[0024] See Figure 1 and Figure 2 The automatic pressure test control device includes a detection gas source assembly 1, a pressure detection element 3, a tracer gas concentration sensor 51, and a control unit 4. The detection gas source assembly 1 and the pressure detection element 3 are both connected to the container under test 20 and electrically connected to the control unit 4. The tracer gas concentration sensor 51 is located on the outside of the container under test 20 and is also electrically connected to the control unit 4. During pressure and airtightness tests on the container under test 20, the control unit 4 controls the detection gas source assembly 1 to introduce the detection gas used for pressure and airtightness testing into the container under test 20. The control unit 4 also controls the flow rate of the detection gas entering the container under test 20 based on the electrical signal from the pressure detection element 3, enabling the automatic pressure test control device to gradually increase the pressure according to the requirements of the pressure test procedure. The detection gas contains a tracer gas that can be detected by the tracer gas concentration sensor 51. When the test container 20 leaks, the concentration of the tracer gas outside the test container 20 increases, and the tracer gas concentration value detected by the tracer gas concentration sensor 51 located outside the test container 20 changes. Therefore, the control unit 4 can determine whether the test container 20 has leaked based on the concentration of the tracer gas detected by the tracer gas concentration sensor 51 located outside the test container 20. This configuration enables the automatic pressure test control device to automatically detect the test container 20, improving detection efficiency and data accuracy.

[0025] The test gas source assembly 1 includes a gas source storage tank 11, a pipeline 12, and a control component 13. The gas source storage tank 11 stores the test gas. The pipeline 12 connects the gas source storage tank 11 and the container under test 20. The control component 13 is connected in series with the pipeline 12 and can control the opening and closing of the pipeline 12. The control component 13 is also electrically connected to the control unit 4, enabling the control unit 4 to output the test gas in the gas source storage tank 11 to the container under test 20 according to the pressure test procedure requirements, and to gradually increase the internal pressure of the container under test 20.

[0026] The detection gas includes a tracer gas and a pressurized gas, which are mixable and do not react. During pressure and airtightness tests on the test container 20, the tracer gas and pressurized gas are mixed and introduced into the container. The tracer gas can be detected by the tracer gas concentration sensor 51, while the pressurized gas cannot. The tracer gas is helium or a halogen gas; the pressurized gas is air, nitrogen, or argon. The tracer gas is more expensive than the pressurized gas; therefore, mixing the tracer gas and pressurized gas reduces the amount of tracer gas required and lowers the detection cost. Preferably, the tracer gas accounts for 5%-30% of the detection gas.

[0027] It should be noted that the detection gas can also be just a tracer gas. That is, the tracer gas is used to increase the gas pressure inside the test container 20, and is also used to be detected by the tracer gas concentration sensor 51 to determine whether the test container 20 has leaked.

[0028] In some embodiments, the tracer gas and the pressurized gas are stored in different gas source tanks 11. When the tracer gas and the pressurized gas enter the test container 20, they are mixed to ensure that the tracer gas is evenly distributed in every position within the test container 20.

[0029] In detail, the gas source storage tank 11 includes a tracer gas storage tank 111 and a pressurized gas storage tank 112. The tracer gas storage tank 111 is used to store tracer gas, and the pressurized gas storage tank 112 is used to store pressurized gas. The pipeline 12 includes a first pipeline 121, a second pipeline 122, and a third pipeline 123. The third pipeline 123 is connected to the container under test 20. One end of the first pipeline 121 is connected to the tracer gas storage tank 111, and the other end is connected to the third pipeline 123. One end of the second pipeline 122 is connected to the pressurized gas storage tank 112, and the other end is connected to the third pipeline 123. This allows the connection of the detection gas source component 1 to the container under test 20 to be performed by simply connecting the third pipeline 123 to the container under test 20, reducing the number of pipelines 12 that need to be connected and simplifying the operation. Furthermore, as the tracer gas and pressurized gas pass through the third pipe 123 into the test container 20, they begin to mix at the third pipe 123, improving the uniformity of the tracer gas and pressurized gas entering the test container 20 and enhancing the accuracy of the airtightness test. In other embodiments, pipe 12 may not include the third pipe 123, with the end of the first pipe 121 away from the tracer gas storage tank 111 and the end of the second pipe 122 away from the pressurized gas storage tank 112 respectively connected to the test container 20.

[0030] The control unit 13 includes a first control unit 131 and a second control unit 132. The first control unit 131 is connected in series with the first pipe 121 to control the opening and closing of the first pipe 121, and the second control unit 132 is connected in series with the second pipe 122 to control the opening and closing of the second pipe 122. During pressure and airtightness tests on the container 20 under test, the first control unit 131 and the second control unit 132 are opened, allowing the tracer gas in the tracer gas storage tank 111 to flow into the container 20 under test, and the pressurized gas in the pressurized gas storage tank 112 to flow into the container 20 under test. Both the first control unit 131 and the second control unit 132 are electrically connected to the control unit 4, enabling the control unit 4 to automatically control the operation of the first control unit 131 and the second control unit 132.

[0031] exist Figure 1In the illustrated embodiment, the first control element 131 is a flow control valve. This valve can detect the flow rate of gas from the tracer gas storage tank 111 to the test container 20, and can also regulate the flow rate in the pipeline 12 between the tracer gas storage tank 111 and the test container 20. In other embodiments, the first control element 131 includes a pressure regulating valve and a flow meter. Both the pressure regulating valve and the flow meter are connected in series on the first pipeline 121. The pressure regulating valve is positioned between the flow meter and the tracer gas storage tank 111. The pressure regulating valve is used to regulate the flow rate in the pipeline 12 between the tracer gas storage tank 111 and the test container 20, and the flow meter is used to detect the flow rate of gas from the tracer gas storage tank 111 to the test container 20.

[0032] The second control unit 132 includes a pressure regulating valve 1321 and a shut-off valve 1322. The pressure regulating valve 1321 is used to regulate the flow rate of the pipeline 12 between the pressurized gas storage tank 112 and the test container 20. The shut-off valve 1322 is located between the pressure regulating valve 1321 and the pressurized gas storage tank 112 and is used to control the opening and closing of the second pipeline 122. Both the pressure regulating valve 1321 and the shut-off valve 1322 are electrically connected to the control unit 4. Since the volume of the test container 20 is fixed, when the gas in the test container 20 reaches a preset value, the volume of the detection gas is fixed. Therefore, based on the volume of the test container 20, the detection gas pressure value detected by the pressure detection device 3, and the tracer gas flow rate value detected by the flow control valve, the tracer gas concentration in the detection gas can be determined. Furthermore, through the control of the flow control valve and the pressure regulating valve 1321, the amounts of tracer gas and pressurized gas can reach a set ratio, thereby achieving a set value for the tracer gas concentration in the detection gas. In one embodiment, the pressure regulating valve 1321 is replaced by a flow control valve, which can detect the flow rate of gas from the pressurized gas storage tank 112 to the test container 20, and can also regulate the flow rate of the pipeline 12 between the pressurized gas storage tank 112 and the test container 20.

[0033] In other embodiments, the first control element 131 includes a pressure regulating valve and a shut-off valve, and the second control element 132 is a flow control valve; or, both the first control element 131 and the second control element 132 are flow control valves.

[0034] The detection gas source assembly 1 also includes a manual control valve 17, which is connected in series with the third pipeline 123 to control the opening and closing of the third pipeline 123.

[0035] The detection gas source assembly 1 also includes a first one-way valve 14 and a second one-way valve 15. The first one-way valve 14 is connected in series to the first pipeline 121, so that the gas in the first pipeline 121 can only flow from the tracer gas storage tank 111 to the test container 20. The second one-way valve 15 is connected in series to the second pipeline 122, so that the gas in the first pipeline 121 can only flow from the pressure gas storage tank 112 to the test container 20. It also prevents the tracer gas from entering the pressure gas storage tank 112 and the pressure gas from entering the tracer gas storage tank 111, that is, it prevents the tracer gas and the pressure gas from flowing back into each other.

[0036] In one embodiment, the gas pressure in the gas source storage tank 11 is greater than the gas pressure required for the test container 20 to be tested, so that the detection gas in the gas source storage tank 11 can spontaneously flow to the test container 20. That is, the gas pressure in the tracer gas storage tank 111 is greater than the gas pressure required for the test container 20 to be tested, and the gas pressure in the pressure gas storage tank 112 is greater than the gas pressure required for the test container 20 to be tested, so that both the tracer gas and the pressure gas can spontaneously flow to the test container 20.

[0037] In one embodiment, the detection gas source assembly 1 further includes a booster pump connected in series with the pipe 12 and electrically connected to the control unit 4. The booster pump is used to increase the pressure of the detection gas so that the detection gas can flow to the test container 20. That is, booster pumps are connected in series with both the first pipe 121 and the second pipe 122. The booster pump on the first pipe 121 is used to pressurize the tracer gas in the tracer gas storage tank 111 so that the tracer gas flows to the test container 20; the booster pump on the second pipe 122 is used to pressurize the pressurized gas in the pressurized gas storage tank 112 so that the pressurized gas flows to the test container 20.

[0038] In some embodiments, the tracer gas and the pressurized gas are stored in the same gas source tank 11. That is, the gas source tank 11 stores both the tracer gas and the pressurized gas simultaneously, and the tracer gas and the pressurized gas are in a mixed state. This reduces the number of gas source tanks 11, and the gas source tank 11 can be connected to the container under test 20 through a single pipe 12. This simplifies the overall structure of the detection gas source component 1, thereby simplifying the overall structure of the automatic pressure test control device and reducing its size and cost.

[0039] The automatic control device for pressure testing also includes an exhaust assembly 2, which includes an exhaust pipe 21 and an exhaust control valve 22. One end of the exhaust pipe 21 is connected to the container under test 20, and the other end is connected to an external detection gas recovery system or the external environment. The exhaust control valve 22 is connected in series with the exhaust pipe 21 and is used to control the opening and closing of the exhaust pipe 21. After the pressure test and airtightness test of the container under test 20 are completed, the first control component 131 and the second control component 132 are closed, and the exhaust control valve 22 is opened, so that the detection gas in the container under test 20 is discharged from the exhaust pipe 21 to the detection gas recovery system or the external environment. The exhaust control valve 22 is electrically connected to the control unit 4, so that the control unit 4 can automatically control the operation of the exhaust control valve 22.

[0040] In one embodiment, the exhaust pipe 21 is connected to the third pipe 123, so that when the third pipe 123 is connected, the connections between the first pipe 121 and the container under test 20, the second pipe 122 and the container under test 20, and the exhaust pipe 21 and the container under test 20 are simultaneously achieved. This reduces the strength of the pipe connections and makes it more convenient to perform pressure tests and airtightness tests on the container under test 20. In other embodiments, the exhaust pipe 21 may also be directly connected to the container under test 20 without being connected to the third pipe 123.

[0041] The exhaust assembly 2 also includes a muffler 23, which is connected in series with the exhaust pipe 21 and located on the side of the exhaust control valve 22 away from the test container 20. When the test gas is discharged from the test container 20, the muffler can reduce the noise of the test gas, reduce noise pollution, and protect the occupational health of the operators.

[0042] The pressure detection element 3 includes a pressure transmitter 31, which is electrically connected to the control unit 4. The inlet of the pressure detection element 3 is connected to the container under test 20, allowing the detection gas inside the container 20 to enter the pressure detection element 3 to detect the internal pressure of the container 20. A certain distance is maintained between the pressure detection element 3 and the third pipe 123 to prevent the airflow entering the container 20 from the third pipe 123 from impacting the pressure detection element 3 and affecting the accuracy of the detected pressure.

[0043] exist Figure 1 In the illustrated embodiment, the pressure sensing element 3 includes two pressure transmitters 31, both of which are connected to the interior of the container 20 under test, meaning they function identically. The two pressure transmitters 31 simultaneously detect the internal air pressure of the container 20, allowing their pressure values ​​to be cross-calibrated and improving accuracy. Even if one pressure transmitter 31 malfunctions, the other can still function normally, ensuring that the testing of the container 20 can proceed smoothly.

[0044] The pressure detection component 3 also includes a pressure gauge 32, which is connected to the interior of the container 20 under test. The pressure gauge 32 is also used to detect the air pressure inside the container 20. Operators can use the accurate reading on the pressure gauge 32 or the pressure value inside the container 20 to ensure that the test gas inside the container 20 is completely purged before disconnecting the third pipe 123 from the container 20, thus improving safety. Preferably, the pressure gauge 32 is a mechanical pressure gauge, and the dial scale limit of the pressure gauge 32 is generally 1.5 to 3.0 times the test pressure, with an accuracy class of not less than 1.6.

[0045] exist Figure 1 In the illustrated embodiment, two pressure gauges 32 are provided. Both pressure gauges 32 have the same function, allowing their pressure values ​​to be cross-calibrated and improving accuracy. If one pressure gauge 32 malfunctions, the other pressure gauge 32 can still function normally, improving safety.

[0046] exist Figure 1 In the illustrated embodiment, the pressure sensing element 3 further includes a connecting pipe with one air inlet and multiple air outlets. The pressure gauge 32 and the pressure transmitter 31 are respectively connected to different air outlets of the connecting pipe, and the air inlet of the connecting pipe is connected to an interface on the container 20 under test. Therefore, when assembling and disassembling the pressure gauge 32 and the pressure transmitter 31 connected to the container 20 under test, they can be detached and assembled from the connecting pipe and the container 20 under test. That is, the pressure gauge 32, the pressure transmitter 31, and the connecting pipe are connected as one unit, making the connection more convenient.

[0047] The type of tracer gas concentration sensor 51 corresponds to the tracer gas. For example, when the tracer gas is helium, the tracer gas concentration sensor 51 is a helium concentration sensor; when the tracer gas is halogen gas, the tracer gas concentration sensor 51 is a halogen gas concentration sensor. The tracer gas concentration sensor 51 is located on the outside of the test container 20. When the test container 20 leaks, the concentration of the tracer gas on the outside of the test container 20 increases, thus allowing the sensor to determine whether a leak has occurred based on the concentration value of the tracer gas concentration sensor 51. When a leak is detected in the test container 20, the operator locates the specific location of the leak and repairs it to ensure that the test container 20 meets the airtightness requirements.

[0048] When a leak is detected in the test container 20, the control unit 4 controls the control component 13 to close to stop the air intake. After the staff detects the specific location of the leak, the control valve 22 is opened to release the test gas inside the test container 20. Then the staff repairs the leak location.

[0049] In one embodiment, multiple tracer gas concentration sensors 51 are configured, and the multiple tracer gas concentration sensors 51 are spaced apart on the circumferential outer side of the test container 20. All of the multiple tracer gas concentration sensors 51 are electrically connected to the control unit 4. When a leak is detected in the test container 20, the operator can quickly locate the leak point by identifying the position of the tracer gas concentration sensor 51 where the detected concentration value has increased, thus improving detection efficiency.

[0050] The specific location of a leak can be determined by the following methods: First, by applying a foaming agent to the outer surface of the test container 20 containing the detection gas and observing the location where bubbles are generated. The location of the bubbles indicates the leak location in the test container 20. Second, by placing the test container 20 containing the detection gas in a liquid and observing the locations where bubbles are generated on the outer surface of the test container 20. The location of the bubbles indicates the leak location in the test container 20.

[0051] Among them, when conducting pressure tests and airtightness tests on the test container 20, the test container 20 can be installed in a closed space to reduce the influence of external air on the tracer gas concentration at the tracer gas concentration sensor 51 and improve the accuracy of detection.

[0052] In one embodiment, the control unit 4 is positioned away from the container under test 20, while the detection gas source assembly 1 is located outside the container under test 20, but relatively close. The control unit 4 is connected to the first control component 131, the second control component 132, the pressure detection component 3, the tracer gas concentration sensor 51, the booster pump 16, and the exhaust control valve 22 via electrical wires. This establishes remote control between the control unit 4 and the first control component 131, the second control component 132, the pressure detection component 3, the tracer gas concentration sensor 51, the booster pump 16, and the exhaust control valve 22, allowing personnel to remain away from the container under test 20 during the testing process, thus improving worker safety. The control unit 4 can be a PLC controller or a microcontroller. During pressure and airtightness tests on the container under test 20, except for the connection between the third pipe 123 and the container under test 20, and the connection between the pressure detection component 3 and the container under test 20, the rest is automatically controlled, reducing the workload of personnel and improving testing efficiency.

[0053] In one embodiment, the control unit 4 includes a gas tracer gas concentration module, which compares the tracer gas concentration value detected by the tracer gas concentration sensor 51 with a set tracer gas concentration value. When the tracer gas concentration value detected by the tracer gas concentration sensor 51 is greater than the set tracer gas concentration value, it is determined that the container under test 20 has leaked, and the signal is transmitted to the control module of the control unit 4 to execute control actions.

[0054] The control unit 4 includes a storage module for storing test data during the testing of the container 20 under test, so that the test process can be reviewed later.

[0055] The automatic control device for pressure testing also includes a camera 61 and a storage unit 62. The camera 61 is located on the outside of the container 20 under test and is electrically connected to the storage unit 62. The camera 61 is used to acquire the test images of the container 20 under test, and the storage unit 62 is used to store the test images acquired by the camera 61. During pressure testing and airtightness testing of the container 20 under test, the camera 61 monitors the test site in real time and stores the video of the test in the storage unit 62 for later review of the test process.

[0056] The steps of the automatic control device for pressure testing to perform pressure testing and airtightness testing on the container 20 under test include:

[0057] S10: Connect the third pipe 123 and the pressure detection element 3 to the container 20 to be tested.

[0058] S20: Input the volume of the test container 20 and the ratio of the tracer gas to the detection gas inside the test container 20. The control unit 4 automatically calculates the required amount of tracer gas based on the volume of the test container 20 and the ratio of the tracer gas to the detection gas inside the test container 20. The ratio of the tracer gas to the detection gas inside the test container 20 can be a default value; therefore, only the volume of the corresponding model of the test container 20 needs to be input. Alternatively, the ratio of the tracer gas to the detection gas inside the test container 20 can be replaced by the ratio between the tracer gas and the pressurized gas.

[0059] S30: The control unit 4 controls the exhaust control valve 22 to close and controls the first control element 131 and the second control element 132 to open, so that the tracer gas and the pressurized gas can enter the container 20 under test.

[0060] S40: The control unit 4 adjusts the opening degree of the first control element 131 and the second control element 132 according to the pressure value of the pressure detection element 3 and the flow value of the second control element 132.

[0061] S50: When the pressure value of pressure sensor 3 equals the set first test step pressure value, control unit 4 controls first control element 131 and second control element 132 to close, thus maintaining pressure inside the container under test 20 for the set duration. During the pressure holding process, if the pressure value of pressure sensor 3 decreases, it indicates that the container under test 20 is leaking. If the pressure value of pressure sensor 3 remains unchanged, it indicates that the container under test 20 is not leaking, and the next test step pressure test can be performed until all test step pressure tests are completed.

[0062] In steps S30 to S50, when the concentration of the tracer gas sensor 51 is greater than the set concentration value, it is determined that the container 20 under test has leaked.

[0063] When a leak occurs in the test container, the control unit 4 shuts down the first control element 131 and the second control element 132. Based on the location of the tracer gas concentration sensor 51, which detects an increase in concentration, the operator locates and marks the leak in the test container 20. Then, the exhaust control valve 22 is opened to release the detected gas from the test container 20, and the leak is repaired. The repaired test container 20 is then retested. Once the test container 20 has completed all pressure tests at each level, the exhaust control valve 22 is opened again to release the detected gas from the test container 20.

[0064] The control unit 4 internally stores an automatic detection program that controls the maximum pressure value to be detected in the container 20 to form multiple detection step pressure values. For example, it forms 10 detection step pressure values ​​such as 10%, 20%, 30%...100%. During the pressurization process, the pressure needs to be increased gradually according to the detection step pressure values.

[0065] In some embodiments, tracer gas can be introduced into the test container 20 first, then pressurized gas can be introduced into the test container 20, and then the tracer gas and pressurized gas can diffuse into each other in the test container 20 to achieve mixing.

[0066] The automatic control device for pressure testing of this application includes a detection gas source assembly 1, a pressure detection element 3, a tracer gas concentration sensor 51, and a control unit 4. The detection gas source assembly 1 includes a gas source storage tank 11, a pipeline 12, and a control element 13. The gas source storage tank 11 is connected to the container under test 20 through the pipeline 12. The control element 13 is connected in series with the pipeline 12. The pressure detection element 3 is connected to the container under test 20. The tracer gas concentration sensor 51 is located on the outside of the container under test 20. The control element 13, the pressure detection element 3, and the tracer gas concentration sensor 51 are all electrically connected to the control unit 4. During pressure testing and airtightness testing of the container under test 20, the control unit 4 controls the control element 13 to open, allowing the detection gas containing the tracer gas in the gas source storage tank 11 to enter the container under test 20. The tracer gas concentration sensor 51 detects the concentration of the tracer gas on the outside of the container under test 20. When the concentration of the tracer gas exceeds a set value, it indicates that there is a leak in the container under test 20, and the control unit 4 controls the control element 13 to close. With the above settings, the automatic control device for pressure testing can automatically detect the container 20 under test, improving the testing efficiency. Moreover, during the testing process, the staff can stay away from the container 20 under test, improving the safety of the staff.

[0067] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An automatic control device for pressure testing, used for performing pressure testing and airtightness testing on a container to be tested, characterized in that, The automatic control device for the pressure test includes: A detection gas source assembly includes a gas source storage tank, a pipeline, and a control unit. The gas source storage tank is used to store detection gas, and the detection gas includes at least a tracer gas. The pipeline connects the gas source storage tank and the container to be tested. The control unit is connected in series with the pipeline to control the on / off state of the pipeline. A pressure detection device that can communicate with the interior of the container under test to detect the air pressure inside the container under test; A tracer gas concentration sensor is disposed on the outside of the container to be tested, and is used to detect the concentration of the tracer gas leaking outside the container to be tested; A control unit is electrically connected to the control element, the pressure detection element, and the tracer gas concentration sensor. The control unit is used to adjust the opening degree of the control element according to the electrical signal of the pressure detection element, and the control unit is also used to control the control element to close according to the electrical signal of the tracer gas concentration sensor.

2. The automatic control device for pressure testing according to claim 1, characterized in that, The gas source storage tank includes a tracer gas storage tank and a pressurized gas storage tank; the pipeline includes a first pipeline and a second pipeline; the control component includes a first control component and a second control component, both of which are electrically connected to the control unit. One end of the first pipeline is connected to the tracer gas storage tank, and the other end is connected to the container to be tested. The first control element is connected in series with the first pipeline to control the opening and closing of the first pipeline. One end of the second pipeline is connected to the pressurized gas storage tank, and the other end is connected to the container to be tested. A second control element is connected in series with the second pipeline to control the on / off state of the second pipeline.

3. The automatic control device for pressure testing according to claim 2, characterized in that, The first control component is a flow control valve, which is capable of detecting the flow rate of gas from the tracer gas storage tank to the test container, and adjusting the flow rate in the pipeline between the tracer gas storage tank and the test container; and / or, The second control component includes a pressure regulating valve and a shut-off valve. The pressure regulating valve is used to regulate the flow rate in the pipeline between the pressure gas storage tank and the container under test. The shut-off valve is located between the pressure regulating valve and the pressure gas storage tank and is used to control the opening and closing of the second pipeline. Both the pressure regulating valve and the shut-off valve are electrically connected to the control unit.

4. The automatic control device for pressure testing according to claim 2, characterized in that, The pipeline also includes a third pipeline, which is connected to the test container. The end of the first pipeline away from the tracer gas storage tank and the end of the second pipeline away from the pressure gas storage tank are both connected to the third pipeline, so that the tracer gas in the first pipeline and the pressure gas in the second pipeline are mixed at the third pipeline and then enter the test container.

5. The automatic control device for pressure testing according to claim 2, characterized in that, The detection gas source assembly further includes a first one-way valve and a second one-way valve. The first one-way valve is connected in series with the first pipeline, so that the gas in the first pipeline can only flow from the tracer gas storage tank to the container under test. The second one-way valve is connected in series with the second pipeline, so that the gas in the first pipeline can only flow from the pressurized gas storage tank to the container under test.

6. The automatic control device for pressure testing according to claim 2, characterized in that, The tracer gas is helium or a halogen gas; the pressurized gas is air, nitrogen, or argon.

7. The automatic control device for pressure testing according to claim 1, characterized in that, The gas pressure in the gas source storage tank is greater than the gas pressure required for the test container, allowing the detection gas in the gas source storage tank to spontaneously flow to the test container; or... The detection gas source assembly also includes a booster pump, which is connected in series with the pipeline and electrically connected to the control unit. The booster pump is used to increase the pressure of the detection gas so that the detection gas can flow to the container to be tested.

8. The automatic control device for pressure testing according to claim 1, characterized in that, Multiple tracer gas concentration sensors are configured and are distributed at intervals on the outer periphery of the container to be tested. All of the multiple tracer gas concentration sensors are electrically connected to the control unit.

9. The automatic control device for pressure testing according to claim 1, characterized in that, The automatic control device for pressure testing also includes an exhaust assembly, which includes an exhaust pipe and an exhaust control valve. One end of the exhaust pipe is connected to the container under test, and the other end is connected to an external detection gas recovery system or the external environment. The exhaust control valve is connected in series with the exhaust pipe and electrically connected to the control unit. The exhaust control valve is used to control the opening and closing of the exhaust pipe.

10. The automatic control device for pressure testing according to claim 9, characterized in that, The exhaust assembly also includes a muffler connected in series with the exhaust pipe and located on the side of the exhaust control valve away from the container under test.

11. The automatic control device for pressure testing according to claim 1, characterized in that, The automatic control device for pressure testing also includes a camera and a storage unit. The camera is located on the outside of the container under test and is electrically connected to the storage unit. The camera is used to acquire the test image of the container under test, and the storage unit is used to store the test image acquired by the camera.

Images