Gas cylinder water pressure test device

Abstract

The utility model provides a gas cylinder water pressure test device, which includes a device body with a receiving chamber, a pump body connected to an external water supply device, and a liquid reservoir; a second control unit and a pressure test unit are provided between the pump body and the gas cylinder to be tested placed in the receiving chamber, the second control unit controls the connection between the pump body and the gas cylinder, and the pressure test unit is used to test the pressure of the gas cylinder; a fourth control unit is provided between the liquid reservoir, the receiving chamber and the pump body, and the fourth control unit is used to control the liquid reservoir to selectively connect to the pump body or the receiving chamber. The gas cylinder water pressure test device described in the utility model can use the external measurement method or the internal measurement method to test the gas cylinder to be tested, and has the advantages of convenient operation and good versatility.

Description

Technical Field

[0001] The utility model relates to the technical field of gas cylinder testing, in particular to a gas cylinder water pressure testing device. Background Art

[0002] The gas cylinder water pressure test is a water pressure strength test for gas cylinders and other pressure vessels. It automatically measures the residual deformation rate of the gas cylinders and then determines whether the test product meets the requirements according to relevant standards. As an important part of the hydrogen storage system onboard hydrogen fuel cell vehicles, in order to strengthen the standardized use of hydrogen cylinders, in accordance with the requirements of the gas cylinder safety technical regulations, vehicle gas cylinders must be regularly inspected one by one.

[0003] As an important component of the regular inspection of gas cylinders, the water pressure test is generally divided into two types: internal measurement method and external measurement method according to the different ways of measuring the volume residual deformation. Among them, the external measurement method is to put the test bottle into a special water jacket and pressurize it to its water pressure test pressure and maintain the pressure for a specified time. The total volume deformation, elastic deformation and residual volume deformation of the test bottle are measured by the amount of water overflowing from the water jacket and the amount of water remaining after pressure relief. The internal measurement method is to pressurize the test bottle to its water pressure test pressure and maintain the pressure for a specified time. The total volume deformation, elastic deformation and residual volume deformation of the test bottle are measured by the indication value of the water pressure measurement instrument after pressurization and the water volume after pressure relief.

[0004] According to the latest periodic inspection standards for hydrogen cylinders for vehicles, Type III cylinders shall be subjected to water pressure tests using the external measurement method, while Type IV cylinders shall be subjected to water pressure tests using the internal measurement method. Existing water pressure test devices for gas cylinders are mostly split structures, that is, one test device can only perform internal or external measurement tests on gas cylinders, making the versatility of the water pressure test device poor. When water pressure tests are required for different types of gas cylinders, two types of water pressure test devices are required, which not only increases the test cost, but also occupies a large amount of space for the test device. Utility Model Content

[0005] In view of this, the utility model aims to provide a gas cylinder water pressure test device with better versatility.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A gas cylinder water pressure test device, comprising a device body with a receiving cavity, a pump body connected to an external water supply device, and a liquid reservoir; a second control unit and a pressure test unit are provided between the pump body and the gas cylinder to be tested placed in the receiving cavity, the second control unit is used to control the connection and disconnection between the pump body and the gas cylinder, and the pressure test unit is used to test the pressure of the gas cylinder;

[0008] A fourth control unit is provided between the liquid reservoir, the accommodating chamber and the pump body, and the fourth control unit is used to control the liquid reservoir to selectively communicate with the pump body or the accommodating chamber.

[0009] Furthermore, a first control unit for controlling the connection between the accommodating chamber and the external water supply device is provided between the accommodating chamber and the external water supply device;

[0010] A third control unit for controlling the connection between the gas cylinder and the liquid storage device is provided between the gas cylinder and the liquid storage device;

[0011] A fifth control part is provided between the fourth control part and the accommodating chamber to connect and disconnect the two.

[0012] A sixth control unit for controlling the on-off between the pump body and the external water supply device is provided between the pump body and the external water supply device.

[0013] Furthermore, the second control unit includes a first valve body disposed between the pump body and the gas cylinder, and a second valve body disposed between the first valve body and the gas cylinder; the pressure testing unit is disposed between the first valve body and the second valve body.

[0014] Furthermore, a first exhaust valve and / or a first pressure relief valve is provided between the pump body and the gas cylinder, and the first exhaust valve and / or the first pressure relief valve is located between the first valve body and the second valve body.

[0015] Furthermore, the device body is provided with a second exhaust valve that can be connected to the accommodating cavity; and / or, the device body is provided with a drainage pipeline connected to the accommodating cavity, and a third valve body is provided on the drainage pipeline, and the third valve body is used to control the on-off of the drainage pipeline.

[0016] Furthermore, the pressure testing unit includes a first pressure gauge arranged between the pump body and the gas cylinder; a second pressure gauge is arranged between the pump body and the gas cylinder, and a fourth valve body that controls the connection between the second pressure gauge and the gas cylinder, and the second pressure gauge is arranged between the second control unit and the pump body, and is used to calibrate the first pressure gauge.

[0017] Furthermore, a third pressure gauge for detecting the pressure of the gas cylinder is provided between the pump body and the gas cylinder.

[0018] Furthermore, it also includes a balance for measuring the amount of water in the liquid reservoir; and / or the liquid reservoir is provided with scale lines, and the scale lines are used to indicate the amount of water in the liquid reservoir.

[0019] Furthermore, the device body includes a shell having the accommodating cavity, and a cover body arranged on the shell; the cover body is provided with a first flexible joint connected to the gas cylinder.

[0020] Furthermore, the pump body is connected to the gas cylinder through a second branch; the second branch includes a first part and a second part connected through a second flexible joint; the first part is connected to the first flexible joint, and the second part is connected to the pump body.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] The gas cylinder water pressure test device described in the utility model can, when applying the external measuring method, add water to the containing cavity and the gas cylinder to be tested respectively, and collect the drainage of the containing cavity through the liquid reservoir; and when applying the internal measuring method, can only add water to the gas cylinder, collect the drainage of the gas cylinder through the liquid reservoir, and protect the gas cylinder through the device body; the gas cylinder water pressure test device cleverly combines the external measuring method and the internal measuring method, and compared with the traditional water pressure test device with a single testing method, it has the advantages of convenient operation and high versatility.

[0023] In addition, the first control unit controls the on-off between the accommodating chamber and the external water supply device, the third control unit controls the on-off between the gas cylinder and the liquid reservoir, the fifth control unit controls the channel between the accommodating chamber and the fourth control unit, and the sixth control unit controls the on-off between the external water supply device and the pump body, which is conducive to changing the water supply method of the water flow. The cooperation between the first valve body and the second valve body is conducive to controlling the water supply state of the gas cylinder. The pressure testing unit is arranged between the first valve body and the second valve body, which is conducive to improving the detection accuracy of the gas cylinder pressure. The first exhaust valve is conducive to the exhaust of the gas cylinder, thereby improving the test accuracy. The setting of the first pressure relief valve can discharge the water in the gas cylinder when the external measurement method is applied. The second exhaust valve on the device body is conducive to the exhaust of the accommodating chamber when adding water; the setting of the drainage pipeline and the third valve body is conducive to the discharge of water in the accommodating chamber.

[0024] In addition, the first pressure gauge has a simple structure and is easy to arrange and implement. The second pressure gauge and the fourth valve body are provided to facilitate verification of the detection accuracy of the first pressure gauge. The third pressure gauge is provided to detect the pressure of the pump body cylinder, which is used as a parameter for adjusting the state of the pump body. The balance is conducive to obtaining the weight of the water in the reservoir, and then the amount of water in the water flow; the scale lines on the reservoir are conducive to obtaining the amount of water in the reservoir, and the amount of water can be used as a calculation parameter for calculating the test results of the cylinder. The provision of the shell, the cover and the first flexible joint facilitates the disassembly and assembly of the cylinder in the device body. The provision of the first part and the second part and the second flexible joint in the second branch facilitates the layout and installation of the second branch. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0026] Figure 1 The present invention is a schematic structural diagram of a gas cylinder water pressure testing device according to an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Sink; 2. Sixth control valve; 3. First control valve; 4. Pump body; 5. Third valve body; 6. Safety relief port; 7. Gas cylinder; 8. Device body; 801. Shell; 802. Cover; 9. First flexible joint; 10. Second exhaust valve; 11. Second flexible joint; 12. First pressure relief valve; 13. Main pipeline; 14. Liquid storage tank; 15. Balance; 16. First pressure gauge; 17. Second branch; 18. First valve body; 19. Second pressure gauge; 20, third pressure gauge; 21, second valve body; 22, first exhaust valve; 23, third control valve; 24, fourth control valve; 25, fifth control valve; 26, fourth valve body; 27, first branch; 28, third branch; 29, bypass line; 30, drain line; 31, first exhaust line; 32, pressure relief line; 33, second exhaust line; 34, first branch; 35, second branch; 100, accommodating chamber. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0032] This embodiment relates to a gas cylinder water pressure test device, the overall structure of which is as follows: Figure 1 As shown in , the gas cylinder water pressure test device includes a device body 8 having a receiving chamber 100, a pump body 4 connected to an external water supply device, and a liquid reservoir 14. A first control unit for controlling the connection between the receiving chamber 100 and the external water supply device is provided between the two.

[0033] A second control unit and a pressure testing unit are provided between the pump body 4 and the gas cylinder 7 placed in the accommodating chamber 100. The second control unit is used to control the on-off connection between the pump body 4 and the gas cylinder 7. The pressure testing unit is used to test the pressure of the gas cylinder 7. A third control unit is provided between the gas cylinder 7 and the liquid reservoir 14 to control the on-off connection between the two.

[0034] A fourth control unit is provided between the liquid reservoir 14, the accommodating chamber 100 and the pump body 4, and the fourth control unit is used to control the liquid reservoir 14 to be selectively connected with the pump body 4 or the accommodating chamber 100, and a fifth control unit is provided between the fourth control unit and the accommodating chamber 100 to connect and disconnect the two.

[0035] The gas cylinder water pressure test device of this embodiment, by providing a first control unit, a second control unit, a third control unit, a fourth control unit and a fifth control unit, can add water to the accommodating chamber 100 and the gas cylinder 7 respectively when the external measurement method is applied, and collect the drainage of the accommodating chamber 100 through the liquid reservoir 14. And when the internal measurement method is applied, it can only add water to the gas cylinder 7, collect the drainage of the gas cylinder 7 to be tested through the liquid reservoir 14, and protect the gas cylinder 7 through the device body 8. The gas cylinder water pressure test device cleverly combines the external measurement method and the internal measurement method. Compared with the traditional water pressure test device with a single test method, it has the advantages of convenient operation and high versatility. At the same time, it is also conducive to reducing the test cost and can reduce the occupation of the layout space.

[0036] As a preferred embodiment, a first control unit for controlling the on-off between the accommodating chamber 100 and the external water supply device is provided between the gas cylinder 7 and the liquid storage device 14, and a third control unit for controlling the on-off between the two is provided between the gas cylinder 7 and the liquid storage device 14. A fifth control unit for controlling the on-off between the two is provided between the fourth control unit and the accommodating chamber 100.

[0037] In terms of detailed structure, Figure 1 As shown in the figure, the accommodating chamber 100 is connected to the external water supply device through the first branch 27, the pump body 4 and the external water supply device are connected through the main line 13, the pump body 4 is connected to the gas cylinder 7 through the second branch 17, a bypass line 29 is connected between the second branch 17 and the liquid reservoir 14, and the gas cylinder 7 is specifically connected to the liquid reservoir 14 through the bypass line 29. The first control part is the first control valve 3 arranged on the first branch 27. The second control part includes a first valve body 18 arranged on the second branch 17, and a second valve body 21 arranged between the first valve body 18 and the gas cylinder 7. The third control part is a third control valve 23 arranged on the bypass line 29.

[0038] Furthermore, the pump body 4 is connected to a first branch 34, the liquid reservoir 14 is connected to a second branch 35, and the accommodating chamber 100 is connected to a third branch 28. The fourth control unit is a fourth control valve 24 used to connect the ends of the first branch 34, the second branch 35, and the third branch 28. The fourth control valve 24 can be a three-way valve in the prior art. The fifth control unit is a fifth control valve 25 provided on the third branch 28.

[0039] In this embodiment, by opening the fifth control valve 25, the accommodating chamber 100 is connected to the liquid reservoir 14 through the fourth control valve 24, so that the water flowing out of the accommodating chamber 100 during the external measurement method can be delivered to the liquid reservoir 14. And by adjusting the fourth control valve 24, the liquid reservoir 14 and the pump body 4 are connected, and the water in the liquid reservoir 14 can be pumped into the second branch 17. By adjusting the state of the fourth control valve 24, the flow direction of the water flow can be changed, so as to facilitate the application of the external measurement method or the internal measurement method to continue testing different types of gas cylinders 7.

[0040] In addition, a sixth control unit for controlling the on-off between the pump body 4 and the external water supply device is provided.

[0041] The sixth control unit controls the on-off between the external water supply device and the pump body 4, which is beneficial to changing the water supply method of the water flow.

[0042] The sixth control unit is a sixth control valve 2 provided on the main line 13 .

[0043] Preferably, the pressure test part is disposed between the first valve body 18 and the second valve body 21. Here, the first valve body 18 and the second valve body 21 cooperate to control the water supply state of the second branch 17, and the pressure test part is disposed between the first valve body 18 and the second valve body 21, which is conducive to improving the pressure detection accuracy of the second branch 17.

[0044] In this embodiment, when applying the external measurement method to the water inlet pressure test of the gas cylinder 7, it is necessary to add water into the accommodating chamber 100. At this time, the first control valve 3 is opened, the first branch 27 is connected to the main line 13, and the water flow in the external water supply device can flow into the first branch 27 under the action of gravity, thereby filling the accommodating chamber 100.

[0045] The external water supply device in this embodiment can be Figure 1 In the water tank 1 shown in the figure, the water in the water tank 1 flows into the receiving chamber 100 under the action of its own gravity, thereby adding water to the receiving chamber 100, which is beneficial to reducing energy consumption. Of course, in the specific implementation, the water supply method of the receiving chamber 100 can still be adjusted according to the use requirements. Of course, in addition to using the water tank 1, the external water supply device can also adopt other structural forms as long as it meets the use requirements.

[0046] Still refer to Figure 1As shown in , specifically in this embodiment, the second branch 17 is provided with a first exhaust valve 22 and a first pressure relief valve 12, and the first exhaust valve 22 and the first pressure relief valve 12 are both located between the first valve body 18 and the second valve body 21. Among them, the second branch 17 is provided with a first exhaust pipeline 31 located between the first valve body 18 and the second valve body 21 and extending upward, and the first exhaust valve 22 is provided on the first exhaust pipeline 31, so that the gas in the second branch 17 can be discharged during the process of adding water to the second branch 17, thereby facilitating the improvement of the test accuracy.

[0047] To facilitate the setting of the first pressure relief valve 12, as Figure 1 As shown in , a pressure relief pipeline 32 is connected to the first exhaust pipeline 31, and the first pressure relief valve 12 is specifically arranged on the pressure relief pipeline 32. The pressure relief pipeline 32 can discharge the water flow in the gas cylinder 7 when the external measurement method is applied, which is conducive to the application and implementation of the external measurement method. It should be noted that the solution of only arranging the first exhaust valve 22 or the first pressure relief valve 12 on the second branch 17 is also feasible, and the arrangement positions of the first exhaust valve 22 and the first pressure relief valve 12 can also be adjusted according to the use requirements.

[0048] As a preferred embodiment, the device body 8 is provided with a second exhaust valve 10 that can communicate with the accommodating chamber 100. Figure 1 As shown in FIG, the top of the device body 8 is provided with a second exhaust pipeline 33 extending upward, the second exhaust pipeline 33 is connected to the top of the accommodating chamber 100, and the second exhaust valve 10 is specifically arranged on the second exhaust pipeline 33. Such an arrangement is conducive to the exhaust of the gas in the accommodating chamber 100 during the process of adding water to the accommodating chamber 100, thereby facilitating the addition of water to the accommodating chamber 100.

[0049] In addition, the device body 8 is provided with a drainage pipeline 30 connected to the accommodating chamber 100, and a third valve body 5 is provided on the drainage pipeline 30, and the third valve body 5 is used to control the on-off of the drainage pipeline 30. Preferably, the drainage pipeline 30 is connected to the bottom of the accommodating chamber 100, and the water in the accommodating chamber 100 flows out by opening the third valve body 5. Further, a safety discharge port 6 can be provided on the device body 8 to release the pressure in the accommodating chamber 100, thereby improving the safety of the device body 8.

[0050] As a preferred embodiment, Figure 1 As shown in , the pressure test part includes a first pressure gauge 16 arranged on the second branch 17. The second branch 17 is provided with a second pressure gauge 19, and a fourth valve body 26 for controlling the connection and disconnection between the second pressure gauge 19 and the second branch 17, and the second pressure gauge 19 is arranged between the second control part and the pump body 4, and is used to verify the first pressure gauge 16. In addition, the second branch 17 is provided with a third pressure gauge 20 for detecting the pressure of the gas cylinder 7.

[0051] The first pressure gauge 16 has a simple structure and is easy to arrange and implement. The second pressure gauge 19 and the fourth valve body 26 are provided to facilitate the verification of the detection accuracy of the first pressure gauge 16. The third pressure gauge 20 is conducive to obtaining the outlet water pressure of the pump body 4, which is then used as a reference for adjusting the rotation speed of the pump body 4.

[0052] Specifically, the first pressure gauge 16 is used more frequently, so that the reliability and accuracy of the first pressure gauge 16 are not high. The second pressure gauge 19, as a standard pressure gauge, has higher reliability and accuracy. The second pressure gauge 19 cooperates with the first pressure gauge 16 to ensure the detection accuracy of the pressure on the second branch 17, thereby improving the test accuracy. When the third pressure gauge 20 detects that the pressure at the outlet exceeds the target pressure, the speed of the pump body 4 can be reduced to make the pressure at the outlet reach the target pressure. When the third pressure gauge 20 detects that the pressure at the outlet is lower than the target pressure, the speed of the pump body 4 can be increased to make the pressure at the outlet reach the target pressure.

[0053] In addition, if Figure 1 As shown in , the liquid reservoir 14 can be specifically a liquid storage cup, which has a simple structure and good use effect. The gas cylinder water pressure test device in this embodiment also includes a balance 15 for measuring the water volume in the liquid reservoir 14. The weight of the water flow in the liquid reservoir 14 under different conditions can be obtained through the balance 15, and the test result of the gas cylinder 7 can be obtained by calculation. Of course, the liquid reservoir 14 can also be provided with scale lines, which are used to indicate the water volume in the liquid reservoir 14. The water volume of the liquid reservoir 14 under different conditions can be obtained through the scale lines, and the test result of the gas cylinder 7 to be tested can also be obtained by calculation.

[0054] In order to facilitate the loading and unloading of the gas cylinder 7 in the device body 8, the device body 8 in this embodiment includes a shell 801 having a receiving cavity 100, and a cover 802 disposed on the shell 801, and a first flexible joint 9 connected to the gas cylinder 7 to be tested is disposed on the cover 802. Figure 1 As shown in FIG. 1 , the top opening of the gas cylinder 7 is connected to the first flexible joint 9 , and is connected to the second branch 17 through the first flexible joint 9 .

[0055] Furthermore, the second branch 17 in this embodiment includes a first part and a second part connected by a second flexible joint 11, wherein the first part is connected to the first flexible joint 9, and the second part is connected to the pump body 4. Here, the arrangement of the first part, the second part and the second flexible joint 11 facilitates the arrangement and implementation of the second branch 17, and the connection between the second branch 17 and the gas cylinder 7.

[0056] It should be noted that, in this embodiment, the connection method between the cover 802 and the shell 801, the structure and installation method of the first flexible joint 9 and the second flexible joint 11 can all refer to GB / T 9251-2022 gas cylinder water pressure test method.

[0057] The gas cylinder water pressure test device in this embodiment performs the following steps when applying the external test method to perform a water pressure test on the gas cylinder 7 to be tested:

[0058] The first step is calibration of the test device: use standard bottles to calibrate the test device to ensure the effectiveness of the device.

[0059] The second step is to connect the gas cylinder 7 to be tested: connect the gas cylinder 7 filled with water and the first flexible joint 9 on the cover body 802 and put them into the shell 801, and form a sealed accommodating cavity 100 through the connection between the cover body 802 and the shell 801, and connect them through the second flexible joint 11 and the second branch 17 to complete the connection.

[0060] The third step is to add water into the accommodating chamber 100: open the first control valve 3, and add water into the accommodating chamber 100 from the water tank 1; open the second exhaust valve 10 and the first control valve 3, and add water into the accommodating chamber 100. When water flows into the liquid reservoir 14, the water volume is recorded as M0 through the balance 15, and the first control valve 3 is closed; when water flows out of the second exhaust pipeline 33, the second exhaust valve 10 and the first control valve 3 are closed, and the water adding is completed. The fourth step is to pressurize and fill the gas cylinder 7 with water: open the first exhaust valve 22, the first valve body 18, the second valve body 21, the fifth control valve 25 and the fourth control valve 24, and fill the gas cylinder 7 with water from the pump body 4. When water flows out of the first exhaust pipeline 31, close the first exhaust valve 22; when the pressure of the first pressure gauge 16 reaches the nominal working pressure, open the fourth valve body 26, and use the second pressure gauge 19 to verify the pressure of the first pressure gauge 16. After the verification is completed, close the fourth valve body 26 and the first valve body 18, and suspend pressurization for inspection until the indicated values ​​and water volume change values ​​of the first pressure gauge 16 and the third pressure gauge 20 are stable; then open the first valve body 18, continue to pressurize the gas cylinder 7 to the test pressure, and maintain the pressure for a certain period of time, record the water volume value M in the liquid reservoir 14, and after the water volume value is stable, the pressurization and water filling of the gas cylinder 7 is completed.

[0061] Step 5, depressurizing the gas cylinder 7: open the first pressure relief valve 12 to release the pressure. After the pressure relief is completed, record the water volume value M' in the liquid storage tank 14, and the pressure relief is completed.

[0062] Step 6, draining the accommodating chamber 100: opening the third valve body 5, draining all the water in the accommodating chamber 100, and draining is completed.

[0063] After executing the above steps, the volume elastic deformation value and volume residual deformation rate of the gas cylinder 7 are calculated by the values ​​of M, M0 and M'. For the specific calculation method, please refer to GB / T 9251-2022 Gas Cylinder Water Pressure Test Method.

[0064] The gas cylinder water pressure test device in this embodiment performs the following steps when applying the internal measurement method to perform a water pressure test on the gas cylinder 7:

[0065] The first step is to connect the gas cylinder 7: connect the gas cylinder 7 filled with water and the first flexible joint 9 on the cover body 802 and put it into the shell 801, and form a sealed accommodating chamber 100 through the connection between the cover body 802 and the shell 801, and connect it through the second flexible joint 11 and the second branch 17 to complete the connection.

[0066] The second step is to fill the second branch 17 with water and exhaust the air: open the first exhaust valve 22, the first valve body 18, the second valve body 21 and the fourth control valve 24, open the sixth control valve 2 to fill the second branch 17 with water from the pump body 4, and when water flows into the liquid reservoir 14, record the water volume as M0 through the balance 15, close the fourth control valve 24, and when water flows out of the first exhaust pipeline 31, close the first exhaust valve 22, and the exhaust is completed.

[0067] The third step is to pressurize and fill the gas cylinder 7 with water: close the sixth control valve 2, open the fourth control valve 24, and fill the gas cylinder 7 with water from the pump body 4; when the pressure of the first pressure gauge 16 reaches the nominal working pressure, open the fourth valve body 26, and use the second pressure gauge 19 to verify the pressure of the first pressure gauge 16. After the verification, close the fourth valve body 26 and the first valve body 18, and suspend pressurization for inspection until the indicated values ​​and water volume change values ​​of the first pressure gauge 16 and the third pressure gauge 20 are stable; then open the first valve body 18, continue to pressurize the gas cylinder 7 to the test pressure, and maintain the pressure for a certain period of time, record the water volume value M in the liquid reservoir 14, and after the water volume value is stable, the pressurization and water filling of the gas cylinder 7 is completed.

[0068] Step 4, depressurizing the gas cylinder 7: close the fourth control valve 24, open the third control valve 23 to depressurize, and after the depressurization is completed, record the water volume value M' in the measuring cup, and the depressurization is completed.

[0069] After executing the above steps, the volume elastic deformation value and volume residual deformation rate of the gas cylinder 7 are calculated by the values ​​of M, M0 and M'. For the specific calculation method, please refer to GB / T 9251-2022 Gas Cylinder Water Pressure Test Method.

[0070] It should be noted that the state of each valve in this embodiment is closed by default unless it is stated to be open. The first exhaust valve 22 and the second exhaust valve 10 are located at the highest point of the entire test device. After the test is completed, all valves are closed. In addition, when the internal measurement method is applied, there is no need to fill the containing chamber 100 with water, and the device body 8 plays a role in protecting the safety of the gas cylinder 7.

[0071] The gas cylinder water pressure test device in this embodiment combines the use requirements of the internal measurement method and the external measurement method, and optimizes the connection method between the various components, so that the test device can apply not only the external measurement method but also the internal measurement method, thereby facilitating the water pressure test of different types of gas cylinders 7 and having good versatility. At the same time, the gas cylinder water pressure test device has a simple structure, is easy to arrange and implement, and is convenient to operate, which is conducive to reducing the test cost.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas cylinder water pressure test device, characterized in that: It comprises a device body (8) having a containing cavity (100), a pump body (4) connected to an external water supply device, and a liquid storage device (14); The accommodating chamber (100) is used to install the gas cylinder (7) to be tested, and the accommodating chamber (100) is in communication with the external water supply device; A second control unit and a pressure testing unit are provided between the pump body (4) and the gas cylinder (7) to be tested, wherein the second control unit is used to control the on-off between the pump body (4) and the gas cylinder (7), and the pressure testing unit is used to test the pressure of the gas cylinder (7); The liquid reservoir (14) is connected to the accommodating chamber (100) and the pump body (4) via a fourth control unit, and the fourth control unit is used to control the liquid reservoir (14) to selectively communicate with the pump body (4) or the accommodating chamber (100).

2. The gas cylinder water pressure test device according to claim 1, characterized in that: A first control unit for controlling the connection between the accommodating chamber (100) and the external water supply device is provided between the two; A third control unit for controlling the connection between the gas cylinder (7) and the liquid storage device (14) is provided between the gas cylinder (7) and the liquid storage device (14); A fifth control unit is provided between the fourth control unit and the accommodating chamber (100) to connect and disconnect the two. A sixth control unit for controlling the on-off connection between the pump body (4) and the external water supply device is provided between the pump body (4) and the external water supply device.

3. The gas cylinder water pressure test device according to claim 1, characterized in that: The second control unit comprises a first valve body (18) provided between the pump body (4) and the gas cylinder (7), and a second valve body (21) provided between the first valve body (18) and the gas cylinder (7); The pressure testing portion is arranged between the first valve body (18) and the second valve body (21).

4. The gas cylinder water pressure test device according to claim 3, characterized in that: A first exhaust valve (22) and / or a first pressure relief valve (12) is provided between the pump body (4) and the gas cylinder (7), and the first exhaust valve (22) and / or the first pressure relief valve (12) is located between the first valve body (18) and the second valve body (21).

5. The gas cylinder water pressure test device according to claim 1, characterized in that: The device body (8) is provided with a second exhaust valve (10) capable of communicating with the accommodating chamber (100); and / or, The device body (8) is provided with a drainage pipeline (30) in communication with the accommodating chamber (100), and a third valve body (5) is provided on the drainage pipeline (30). The third valve body (5) is used to control the on-off of the drainage pipeline (30).

6. The gas cylinder water pressure test device according to claim 1, characterized in that: The pressure testing unit comprises a first pressure gauge (16) disposed between the pump body (4) and the gas cylinder (7); A second pressure gauge (19) is provided between the pump body (4) and the gas cylinder (7), and a fourth valve body (26) for controlling the connection and disconnection between the second pressure gauge (19) and the gas cylinder (7); the second pressure gauge (19) is provided between the second control unit and the pump body (4), and is used to calibrate the first pressure gauge (16).

7. The gas cylinder water pressure test device according to claim 1, characterized in that: A third pressure gauge (20) for detecting the pressure in the gas cylinder (7) is provided between the pump body (4) and the gas cylinder (7).

8. The gas cylinder water pressure test device according to claim 1, characterized in that: Also includes a balance (15) for measuring the amount of water in the liquid reservoir (14); and / or, The liquid reservoir (14) is provided with scale lines, and the scale lines are used to indicate the amount of water in the liquid reservoir (14).

9. The gas cylinder water pressure test device according to any one of claims 1 to 8, characterized in that: The device body (8) comprises a shell (801) having the accommodating cavity (100), and a cover (802) arranged on the shell (801); The cover body (802) is provided with a first flexible joint (9) connected to the gas cylinder (7).

10. The gas cylinder water pressure test device according to claim 9, characterized in that: The pump body (4) is connected to the gas cylinder (7) via a second branch (17); The second branch (17) comprises a first part and a second part connected via a second flexible joint (11); The first part is connected to the first flexible joint (9), and the second part is connected to the pump body (4).

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