A performance testing device and method for a dual-flow electromagnetic valve

Abstract

The application discloses a kind of dual-flow electromagnetic valve performance testing device and testing method, including base, fixed cover plate is fixed in base upper portion, movable cover plate is equipped in fixed cover plate side, fixed cover plate can seal valve body import, movable cover plate can seal valve body export, fixed cover plate includes air inlet pipe and the first sensor connected with air inlet pipe, air inlet pipe can be communicated with import, movable cover plate includes second inner cover and second sensor, second inner cover is equipped with airflow passage in, airflow passage can be communicated with export, second sensor sensing head is inserted into airflow passage, and pilot valve switch is equipped above base, and pilot valve switch can be connected with pilot valve or separate from pilot valve.The application is equipped with fixed cover plate, movable cover plate and pilot valve switch, and the performance of valve body can be tested without switching different testing devices many times, with high testing precision and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and in particular to a dual-flow solenoid valve performance testing device and testing method. Background Technology

[0002] When using a dual-flow solenoid valve for refueling, the large valve is opened first, and then closed and the small valve is opened when refueling is almost complete, allowing for precise refueling. Therefore, it is typically installed in fuel dispensers. Each dual-flow solenoid valve undergoes multiple performance tests before leaving the factory to ensure product quality. However, currently, multiple tests cannot be performed on the same workstation or device. Different performance tests require transferring the dual-flow solenoid valve to different testing devices. This method is not only inefficient and wasteful of resources, increasing testing costs, but also compromises testing accuracy when transferred multiple times and tested on different devices. Therefore, an improvement is urgently needed. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dual-flow solenoid valve performance testing device and method. By setting a fixed cover plate, a movable cover plate and a pilot valve switch, multiple performance characteristics of the valve body can be tested without switching between different testing devices multiple times. The testing accuracy is high and the efficiency is high.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A dual-flow solenoid valve performance testing device is provided for testing the valve body. The valve body includes an inlet, an outlet, and a pilot valve. It includes a base, with a fixed cover plate fixed to the upper part of the base. A movable cover plate is provided on the side of the fixed cover plate. The fixed cover plate can seal the valve body inlet, and the movable cover plate can seal the valve body outlet. The fixed cover plate includes an air inlet pipe and a first sensor connected to the air inlet pipe. The air inlet pipe can communicate with the inlet. The movable cover plate includes a second inner cover and a second sensor. An airflow channel is provided inside the second inner cover, and the airflow channel can communicate with the outlet. The sensing head of the second sensor is inserted into the airflow channel. A pilot valve switch is provided above the base, and the pilot valve switch can be connected to or disconnected from the pilot valve.

[0006] The movable cover includes a second outer cover, and a second inner cover is installed inside the second outer cover. A sealed mounting cavity is formed between the second outer cover and the second inner cover. The mounting cavity is isolated from the airflow channel. A lifting plate is installed inside the mounting cavity. The lifting plate can be moved and inserted into the airflow channel and block the airflow channel. The sensing head of the second sensor is located directly above the lifting plate.

[0007] The mounting cavity is equipped with an adjustment block, and the lower part of the lifting plate abuts against the upper part of the adjustment block. The adjustment block can move horizontally and push the lifting plate upward.

[0008] The upper part of the adjustment block includes a first step, a second step, and a third step. The first step and the second step are transitioned by a ramp, and the second step and the third step are transitioned by a ramp. When the lower part of the lifting plate abuts against the upper part of the first step, the upper surface of the lifting plate is lower than the lower part of the airflow channel. When the lower part of the lifting plate abuts against the upper part of the second step, the upper surface of the lifting plate is higher than the lower part of the airflow channel but lower than the upper part of the airflow channel. When the lower part of the lifting plate abuts against the third step, the lifting plate can block the airflow channel.

[0009] A motor is provided on the outside of the second outer cover. The end of the drive shaft of the motor is connected to a sleeve. The sleeve is located in the mounting cavity. The motor is sealed to the second outer cover. A horizontal push rod is provided on the side of the adjusting block. The other end of the push rod is provided with a threaded part. The threaded part is inserted into the sleeve and threadedly connected to the sleeve. Rotating the sleeve can drive the push rod to move and push the adjusting block to move.

[0010] The second outer cover has a first supporting rib inside, the push rod passes through the first supporting rib, the push rod has a first limiting rib on the outside, and a return spring is sleeved on the outside of the push rod. The two ends of the return spring abut against the first supporting rib and the first limiting rib, respectively.

[0011] The airflow channel has an annular groove inside, and a sealing sleeve is provided inside the annular groove. The two sides of the lifting plate abut against the sealing sleeve, and the upper end of the lifting plate can be inserted into the annular groove.

[0012] The lifting plate is provided with a second limiting rib on its outer side, and a rectangular spring is sleeved on the outer side of the lifting plate. The lower part of the rectangular spring abuts against the upper part of the second limiting rib, and the upper part of the rectangular spring abuts against the upper surface of the mounting cavity.

[0013] A performance testing method for a dual-flow solenoid valve includes valve body installation, high-flow test, low-flow test, low-pressure internal leakage test, high-pressure internal leakage test, and high-pressure external leakage test.

[0014] Valve body installation steps:

[0015] S1. Place the valve body on the upper part of the base, with the valve body inlet abutting against the fixed cover plate;

[0016] S2. The second cylinder pushes the movable cover plate to move so that the movable cover plate abuts against the valve body outlet. The valve body inlet is sealed by the fixed cover plate, and the valve body outlet is sealed by the movable cover plate.

[0017] S3. The first cylinder drives the pilot valve switch to descend, so that the pilot valve switch is connected to the first pilot valve and the second pilot valve respectively, completing the valve body installation;

[0018] High flow rate test procedure: First, control the opening of the first pilot valve and the second pilot valve by switching the pilot valve; then, introduce a high flow rate of gas into the inlet pipe. The high flow rate of gas squeezes the diaphragm to make the inlet and outlet directly connected. The high flow rate of gas is discharged to the outside through the airflow channel. The flow rate of the gas is detected by the third sensor in the airflow channel. At this time, the airflow channel is in a fully open state. The high flow rate test is judged by observing the value on the second sensor.

[0019] Small flow test procedure: First, the pilot valve switch controls the opening of the first pilot valve and the closing of the second pilot valve; then the motor drives the sleeve to rotate, the sleeve pushes the push rod to move, the push rod drives the adjusting block to move, and the adjusting block drives the lifting plate to the second stage, at which point the airflow channel is in a semi-open state; finally, a small flow of gas is introduced into the inlet pipe, and the small flow of gas flows into the airflow channel from the outlet after passing through the first pilot valve. When it passes the position of the lifting plate, the flow rate increases, and the value on the second sensor set at this position is used to determine whether the small flow test is qualified.

[0020] Low-pressure internal leakage test procedure: First, control the first pilot valve and the second pilot valve to close by switching the pilot valve; then, introduce a small flow of gas into the air inlet pipe, and observe the parameters of the second and third sensors to determine whether the low-pressure internal leakage is qualified;

[0021] High-pressure internal leakage test procedure: First, control the first pilot valve and the second pilot valve to close by switching the pilot valve; then, introduce a large flow of gas into the air inlet pipe, and observe the parameters of the second and third sensors to determine whether the high-pressure internal leakage is qualified.

[0022] High-pressure leakage test procedure: First, control the opening of the first pilot valve and the second pilot valve by switching the pilot valve; then, the adjusting block continues to move to push the lifting plate to the third stage. At this time, the airflow channel is blocked by the lifting plate to make the valve body inside a sealed state; finally, high-pressure gas is introduced into the air inlet pipe. By observing the parameters on the first sensor and the third sensor, it can be determined whether the high-pressure leakage is qualified.

[0023] The fixed cover plate includes a transparent first outer cover, and the first outer cover has a first liquid inlet and a first liquid outlet on its upper and lower sides, respectively. When the fixed cover plate abuts against the inlet, a first liquid storage chamber can be formed between the outer side of the valve body and the first outer cover.

[0024] The movable cover includes a transparent second outer cover, with a second liquid inlet and a second liquid outlet on the upper and lower sides of the second outer cover, respectively. When the movable cover abuts against the outlet, a second liquid storage chamber can be formed between the outer side of the valve body and the second outer cover.

[0025] During the testing of the valve body, the airtightness of the inlet and the fixed cover plate, as well as the airtightness of the outlet and the movable cover plate, should be ensured. The steps are as follows: the first liquid inlet and the second liquid inlet are connected to the external water source respectively, the first liquid outlet and the second liquid outlet are closed, and water is passed through the first liquid inlet and the second liquid inlet to fill the first liquid storage chamber and the second liquid storage chamber with water. When testing the valve body, observe whether air bubbles are generated in the first liquid storage chamber and the second liquid storage chamber.

[0026] The beneficial effects of this invention are:

[0027] 1. When conducting low-flow tests, the gas flow rate is small. If the gas passes directly through the airflow channel, the gas velocity will be very low, which may lead to inaccurate flow velocity detection by the second sensor. If the area of ​​the second sensor's sensing head is reduced by moving the lifting plate upward, the gas velocity at that point can be appropriately increased during low-flow tests, making it easier for the second sensor to detect and improving the detection accuracy of low-flow tests.

[0028] 2. By setting the first, second, and third steps on the adjusting block, the lifting plate can be adjusted to three different heights. This enables the invention to perform various valve body performance tests, including small flow rate tests, large flow rate tests, low-pressure internal leakage tests, high-pressure internal leakage tests, and high-pressure external leakage tests, without having to switch to different testing devices. This not only effectively improves testing efficiency and reduces testing costs, but also improves testing accuracy and makes the test results more reliable.

[0029] 3. In this invention, the lifting plate, adjusting block, push rod and sleeve are all set inside the mounting cavity and isolated from the outside, which can effectively prevent the risk of air leakage caused by adjusting the diameter of the airflow channel, greatly improve the airtightness inside the moving cover, effectively reduce the risk of inaccurate valve body test results due to unreliable sealing, and thus further improve the test accuracy. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of an existing dual-flow solenoid valve.

[0031] Figure 2 This is a schematic diagram of the structure of the present invention;

[0032] Figure 3 This is a partial enlarged view of the present invention;

[0033] Figure 4 This is a partially enlarged view of the cross-sectional view of the present invention;

[0034] Figure 5 This is a partial cross-sectional view of the present invention during high-flow-rate testing;

[0035] Figure 6This is a partial cross-sectional view of the present invention during low-flow-rate testing;

[0036] Figure 7 This is a partial cross-sectional view of the present invention during a high-pressure leakage test.

[0037] In the diagram: 1. Valve body; 11. Inlet; 12. Outlet; 13. Upper chamber; 14. Lower chamber; 15. Diaphragm; 16. Diaphragm orifice; 17. Spring; 18. First pilot valve; 19. Second pilot valve; 101. Annular rib; 2. Base; 21. Support plate; 22. Support frame; 23. First cylinder; 24. Second cylinder; 25. Motor; 26. Sleeve; 3. Fixed cover plate; 31. First outer cover; 32. First inner cover; 33. Air inlet pipe; 34. First sensor; 35. First liquid storage chamber; 36. First liquid inlet; 37. First liquid outlet; 4. Movable cover plate; 41. Second sensor; 42. Third sensor; 4 3. Mounting cavity; 5. Second outer cover; 51. First support rib; 52. Second support rib; 53. Sealing cover; 54. Through hole; 55. Second liquid storage cavity; 56. Second liquid inlet; 57. Second liquid outlet; 58. Sealing gasket; 6. Second inner cover; 61. Airflow channel; 62. Annular groove; 63. Sealing sleeve; 64. Guide frame; 65. Guide rib; 7. Adjusting block; 71. First step; 72. Second step; 73. Third step; 74. Inclined surface; 75. Push rod; 76. Threaded part; 77. First limiting rib; 78. Return spring; 8. Lifting plate; 81. Second limiting rib; 82. Rectangular spring; 9. Pilot valve switch. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0039] In the description of this specification, the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0040] like Figures 1 to 7As shown, a dual-flow solenoid valve performance testing device is used to test valve body 1. Valve body 1 includes an inlet 11, an outlet 12, an upper chamber 13, a lower chamber 14, a diaphragm 15, a diaphragm orifice 16, a spring 17, and pilot valves. The pilot valves are a first pilot valve 18 and a second pilot valve 19. The working principle of valve body 1 is as follows: when both the first pilot valve 18 and the second pilot valve 19 are closed, the oil pressure in the upper chamber 13 is equal to that at the inlet 11. The diaphragm 15 closes the main valve under the action of the spring 17, and at this time, there is no flow in valve body 1; when both the first pilot valve 18 and the second pilot valve 19 are open... When the valve is open, because the oil outlet area of ​​the second pilot valve 19 is larger than the area of ​​the diaphragm orifice 16, the pressure in the lower chamber 14 of the diaphragm 15 is less than the pressure in the upper chamber 13, thus forming a pressure difference. The diaphragm 15 overcomes the spring force to open the main valve port, so that the inlet 11 and the outlet 12 are directly connected, and the valve body 1 opens with a large flow rate. When the second pilot valve 19 is closed, the oil in the upper chamber 13 flows into the lower chamber 14 from the diaphragm orifice 16, so that the pressure in the upper chamber 13 and the lower chamber 14 are equal. The diaphragm 15 moves upward under the action of the spring 17 and closes the valve port. At this time, only a small flow rate flows from the first pilot valve 18 to the oil outlet.

[0041] like Figures 2-4 As shown, based on the above-mentioned oil discharge principle, performance testing was conducted on its valve body 1, including a base 2. A fixed cover plate 3 is fixed to the upper part of the base 2. A movable cover plate 4 is provided on the side of the fixed cover plate 3. Specifically, a support plate 21 is connected to the upper part of the base 2, and the fixed cover plate 3 is fixed inside the support plate 21. A second cylinder 24 is connected to the side of the movable cover plate 4. The second cylinder 24 is connected to the base 2, and can drive the movable cover plate 4 to move. The fixed cover plate 3 can seal the inlet 11 of the valve body 1, and the movable cover plate 4 can seal the inlet 11 of the valve body 1. The valve body 1 has an outlet 12. The fixed cover plate 3 includes an air inlet pipe 33 and a first sensor 34 connected to the air inlet pipe 33. The air inlet pipe 33 can communicate with the inlet 11 and is connected to an external air source. The movable cover plate 4 includes a second inner cover 6 and a second sensor 41. The second inner cover 6 has an airflow channel 61 that can communicate with the outlet 12. The sensor head of the second sensor 41 is inserted into the airflow channel 61. The base 2 has a pilot valve switch 9 on top. The pilot valve switch 9 can be connected to or disconnected from the pilot valve.

[0042] The first sensor 34 is connected to the inside of the valve body 1. When the airflow channel 61 is closed, the pressure inside the valve body 1 can be detected by the first sensor 34. The second sensor 41 is used to detect the flow rate of gas in the airflow channel 61. The pilot valve switch 9 can open or close the first pilot valve 18 and the second pilot valve 19. The first sensor 34, the second sensor 41 and the pilot valve switch 9 are all existing technologies.

[0043] like Figure 1As shown, the pilot valve switch 9 is raised and lowered by the first cylinder 23. The upper part of the base 2 is fixed with a support frame 22. The upper end of the first cylinder 23 is fixed with the support frame 22. The telescopic rod of the first cylinder 23 is connected to the pilot valve switch 9.

[0044] like Figure 3 and Figure 4 As shown, the movable cover 4 includes a second outer cover 5, and a second inner cover 6 is installed inside the second outer cover 5. A sealed mounting cavity 43 is formed between the second outer cover 5 and the second inner cover 6. The mounting cavity 43 is isolated from the airflow channel 61. A lifting plate 8 is installed inside the mounting cavity 43. The lifting plate 8 can be moved and inserted into the airflow channel 61 and block the airflow channel 61. The sensing head of the second sensor 41 is located directly above the lifting plate 8. By moving the lifting plate 8 up and down, the size of the area of ​​the airflow channel 61 at the sensing head of the second sensor 41 can be changed. When performing a small flow test, because the gas flow is small, if it passes directly through the airflow channel 61, the gas velocity will be very small, which may lead to inaccurate velocity detection by the second sensor 41. By moving the lifting plate 8 up to reduce the area at the sensing head of the second sensor 41, it can be ensured that the gas velocity at that point can be appropriately increased during the small flow test, which facilitates detection by the second sensor 41 and helps improve the detection accuracy of the small flow test.

[0045] like Figures 5-7 As shown, the mounting cavity 43 is equipped with an adjusting block 7. The lower part of the lifting plate 8 abuts against the upper part of the adjusting block 7. The adjusting block 7 can move horizontally and push the lifting plate 8 upward. Specifically, the upper part of the adjusting block 7 includes a first step 71, a second step 72, and a third step 73. The first step 71 and the second step 72 are connected by an inclined surface 74, and the second step 72 and the third step 73 are connected by an inclined surface 74. When the lower part of the lifting plate 8 abuts against the upper part of the first step 71, the upper surface of the lifting plate 8 is lower than the lower part of the airflow channel 61. When the lower part of the lifting plate 8 abuts against the upper part of the second step 72, the upper surface of the lifting plate 8 is higher than the lower part of the airflow channel 61 but lower than the upper part of the airflow channel 61. When the lower part of the lifting plate 8 abuts against the third step 73, the lifting plate 8 can block the airflow channel 61.

[0046] By setting the first stage 71, the second stage 72, and the third stage 73 on the adjusting block 7, the lifting plate 8 can be adjusted to three different heights. This enables the present invention to perform various valve body 1 performance tests, including small flow rate tests, large flow rate tests, low-pressure internal leakage tests, high-pressure internal leakage tests, and high-pressure external leakage tests, without having to switch to different testing devices. This not only effectively improves testing efficiency and reduces testing costs, but also improves testing accuracy and makes the test results more reliable.

[0047] Furthermore, a second limiting rib 81 is provided on the outer side of the lifting plate 8, and a rectangular spring 82 is sleeved on the outer side of the lifting plate 8. The lower part of the rectangular spring 82 abuts against the upper part of the second limiting rib 81, and the upper part of the rectangular spring 82 abuts against the upper surface of the mounting cavity 43. A guide frame 64 is provided on the inner wall of the mounting cavity 43, and the lifting plate 8 passes through the guide frame 64. When the lifting plate 8 rises, it can compress the rectangular spring 82. When the adjusting block 7 moves to the right, the lifting plate 8 can automatically descend under the action of the rectangular spring 82, thereby realizing the reset of the lifting plate 8, which facilitates the testing of the next valve body 1 by the present invention.

[0048] Furthermore, such as Figure 5 As shown, the airflow channel 61 has an annular groove 62 inside, and a sealing sleeve 63 is provided inside the annular groove 62. The lifting plate 8 abuts against the sealing sleeve 63 on both sides, and the upper end of the lifting plate 8 can be inserted into the annular groove 62. Figure 7 As shown, when the upper end of the lifting plate 8 is fully inserted into the upper end of the annular groove 62, the sealing sleeve 63 can play a sealing role, thereby effectively blocking the airflow channel 61 and preventing the gas in the airflow channel 61 on the left side of the lifting plate 8 from seeping to the right side, thus facilitating the valve body 1 to perform high pressure leakage test.

[0049] The adjusting block 7 is driven by a motor 25. Specifically, a motor 25 is provided on the outside of the second outer cover 5. The end of the drive shaft of the motor 25 is connected to a sleeve 26, which is located in the mounting cavity 43. The motor 25 is sealed to the second outer cover 5. A horizontal push rod 75 is provided on the side of the adjusting block 7. The push rod 75 has a non-circular cross-section. The other end of the push rod 75 is provided with a threaded part 76. The threaded part 76 is inserted into the sleeve 26 and threadedly connected to the sleeve 26. Rotating the sleeve 26 can drive the push rod 75 to move and push the adjusting block 7 to move. The second outer cover 5 is provided with a first support rib 51 and a second support rib 52. The push rod 75 passes through the first support rib 51, and the sleeve 26 passes through the second support rib 52. The bottom of the second inner cover 6 is provided with a guide rib 65, and the adjusting block 7 is located above the guide rib 65.

[0050] With the above design, when the motor 25 drives the sleeve 26 to rotate, the rotation of the push rod 75 can be restricted due to the cooperation between the first support rib 51 and the push rod 75 and the cooperation between the adjusting block 7 and the guide rib 65. Thus, when the sleeve 26 rotates, the sleeve 26 can push the push rod 75 to move, and can easily push the adjusting block 7 to move, thereby realizing the position adjustment of the lifting plate 8.

[0051] In this invention, the lifting plate 8, adjusting block 7, push rod 75 and sleeve 26 are all set inside the mounting cavity 43 and isolated from the outside, thereby effectively preventing the risk of air leakage caused by adjusting the diameter of the airflow channel 61, greatly improving the airtightness inside the movable cover plate 4, effectively reducing the risk of inaccurate test results of the valve body 1 due to unreliable sealing, and thus further improving the test accuracy.

[0052] Furthermore, a first limiting rib 77 is provided on the outer side of the push rod 75, and a return spring 78 is sleeved on the outer side of the push rod 75. The two ends of the return spring 78 abut against the first supporting rib 51 and the first limiting rib 77 respectively. When the push rod 75 moves to the left, it can compress the return spring 78. By setting the return spring 78, the threaded part 76 can be effectively prevented from disengaging from the sleeve 26, thereby improving the reliability of the structure.

[0053] When testing the valve body 1, the leakage problem needs to be considered. The most likely leakage points are the mating points between the fixed cover plate 3 and the inlet 11 and the mating points between the movable cover plate 4 and the outlet 12. During the testing process, the valve body 1 should ensure the airtightness between the inlet 11 and the fixed cover plate 3 and the airtightness between the outlet 12 and the movable cover plate 4.

[0054] like Figure 2 As shown, the fixed cover plate 3 includes a transparent first outer cover 31. The first outer cover 31 has a first liquid inlet 36 and a first liquid outlet 37 on its upper and lower sides, respectively. When the fixed cover plate 3 abuts against the inlet 11, a first liquid storage chamber 35 can be formed between the outer side of the valve body 1 and the first outer cover 31.

[0055] like Figure 2 and Figure 3 As shown, the movable cover plate 4 includes a transparent second outer cover 5. The second outer cover 5 has a second liquid inlet 56 and a second liquid outlet 57 on its upper and lower sides, respectively. When the movable cover plate 4 abuts against the outlet 12, a second liquid storage chamber 55 can be formed between the outer side of the valve body 1 and the second outer cover 5.

[0056] The first inlet 36 and the second inlet 56 can be connected to an external water source. During the testing of the valve body 1, the first outlet 37 and the second outlet 57 are closed, and water is passed through the first inlet 36 and the second inlet 56 to fill the first storage chamber 35 and the second storage chamber 55 with water. Through the transparent first outer cover 31 and the second outer cover 5, it is possible to observe whether air bubbles are generated in the first storage chamber 35 and the second storage chamber 55. After the valve body 1 is tested, the first outlet 37 and the second outlet 57 can be opened to empty the first storage chamber 35 and the second storage chamber 55. When testing the liquid inside valve body 1, it is necessary to ventilate the inside of valve body 1. If there is air leakage at the joint between the fixed cover plate 3 and the inlet 11 or the joint between the movable cover plate 4 and the outlet 12, air bubbles will be generated in the corresponding liquid storage chamber (first liquid storage chamber 35 or second liquid storage chamber 55). At this time, valve body 1 needs to be reinstalled. Through the above design, the test results can be effectively avoided due to air leakage at the joint between the fixed cover plate 3 and the inlet 11 or the joint between the movable cover plate 4 and the outlet 12 during the test, which greatly improves the reliability and accuracy of the test results.

[0057] like Figure 3 and Figure 4 As shown, a sealing cover 53 is fixed to the end of the second inner cover 6. The sealing cover 53 is made of rubber and is inserted into the outlet 12 for sealing. The sealing cover 53 has a through hole 54 inside, which is connected to the airflow channel 61. Both ends of the inlet 11 and outlet 12 of the valve body 1 are provided with annular ribs 101. The left side of the second outer cover 5 can be inserted into the annular ribs 101. A sealing gasket 58 is connected to the end of the second outer cover 5. The other end of the sealing gasket 58 abuts against the annular ribs 101. Through the above design, not only is the sealing between the movable cover 4 and the outlet 12 more reliable, but a sealed second liquid storage chamber 55 can also be formed, which is convenient for checking the airtightness of the fit between the movable cover 4 and the outlet 12. The first inner cover 32 is provided inside the first outer cover 31. The air inlet pipe 33 is installed inside the first inner cover 32. The fit structure between the fixed cover 3 and the inlet 11 is the same as the fit structure between the movable cover 4 and the outlet 12.

[0058] The performance testing method using a dual-flow solenoid valve performance testing device includes valve body 1 installation, high flow rate test, low flow rate test, low pressure internal leakage test, high pressure internal leakage test, and high pressure external leakage test;

[0059] Valve body 1 installation steps:

[0060] S1. Place the valve body 1 on the upper part of the base 2, with the inlet 11 of the valve body 1 abutting against the fixed cover plate 3;

[0061] S2, the second cylinder 24 pushes the movable cover plate 4 to move so that the movable cover plate 4 abuts against the outlet 12 of the valve body 1, the inlet 11 of the valve body 1 is sealed by the fixed cover plate 3, and the outlet 12 of the valve body 1 is sealed by the movable cover plate 4.

[0062] S3. The first cylinder 23 drives the pilot valve switch 9 to descend, so that the pilot valve switch 9 is connected to the first pilot valve 18 and the second pilot valve 19 respectively, thus completing the installation of the valve body 1.

[0063] High-flow-rate test procedure: First, the first pilot valve 18 and the second pilot valve 19 are opened by controlling the pilot valve switch 9; then, a high-flow-rate gas is introduced into the air inlet pipe 33. The high-flow-rate gas squeezes the diaphragm 15 to make the inlet 11 and the outlet 12 directly connected. The high-flow-rate gas is discharged to the outside through the airflow channel 61. The flow rate of the gas is detected by the second sensor 41 in the airflow channel 61. At this time, the airflow channel 61 is in a fully open state. The high-flow-rate test is judged by observing the value on the second sensor 41.

[0064] Small flow test procedure: First, pilot valve switch 9 controls the first pilot valve 18 to open and the second pilot valve 19 to close; then motor 25 drives sleeve 26 to rotate, sleeve 26 pushes push rod 75 to move, push rod 75 drives adjustment block 7 to move, adjustment block 7 drives lifting plate 8 to rise to the second stage 72, at this time the airflow channel 61 is in a half-open state; finally, a small flow of gas is introduced into the inlet pipe 33, the small flow of gas flows into the airflow channel 61 from outlet 12 after passing the first pilot valve 18, the flow rate increases when passing the position of lifting plate 8, and the value on the second sensor 41 set at this position is observed to determine whether the small flow test is qualified;

[0065] Low-pressure internal leakage test procedure: First, control the first pilot valve 18 and the second pilot valve 19 to close by controlling the pilot valve switch 9; then, introduce a small flow of gas into the air inlet pipe 33, and determine whether the low-pressure internal leakage is qualified by observing the parameters of the second sensor 41 and the third sensor 42.

[0066] High-pressure internal leakage test procedure: First, control the first pilot valve 18 and the second pilot valve 19 to close by controlling the pilot valve switch 9; then, introduce a large flow of gas into the air inlet pipe 33, and determine whether the high-pressure internal leakage is qualified by observing the parameters of the second sensor 41 and the third sensor 42; during the high-pressure internal leakage test, since the upper chamber 13 and the lower chamber 14 are connected through the diaphragm hole 16, the pressure in the upper chamber 13 and the lower chamber 14 is the same, and the diaphragm 15 will not deform.

[0067] High-pressure leakage test procedure: First, the first pilot valve 18 and the second pilot valve 19 are opened by controlling the pilot valve switch 9; then the adjusting block 7 continues to move and push the lifting plate 8 to the third stage 73. At this time, the airflow channel 61 is blocked by the lifting plate 8 so that the valve body 1 is in a sealed state; finally, high-pressure gas is introduced into the air inlet pipe 33. By observing the parameters on the first sensor 34 and the third sensor 42, it can be determined whether the high-pressure leakage is qualified.

[0068] In this invention, both the second sensor 41 and the third sensor 42 are flow sensors. During the high-pressure leakage test, the first sensor 34 can determine whether there is a pressure leak inside the valve body 1, and the third sensor 42 can determine whether the lifting plate 8 is sealed. If there is a gas leak at the lifting plate 8, the outlet end of the airflow channel 61 can be blocked, or the lifting plate 8 can be moved again to achieve a sealing effect, thereby preventing the gas leak at the lifting plate 8 from affecting the high-pressure leakage test results.

[0069] This invention can test multiple performance characteristics of valve body 1, resulting in more reliable test results and significantly improved testing efficiency, thereby helping to reduce costs and increase enterprise benefits.

[0070] 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 within the protection scope of the present invention.

Claims

1. A performance testing device for a dual-flow solenoid valve, used to test a valve body (1), the valve body (1) comprising an inlet (11), an outlet (12), a pilot valve, and a diaphragm (15), wherein the pilot valves are a first pilot valve (18) and a second pilot valve (19), characterized in that: Includes a base (2), with a fixed cover plate (3) fixed on the upper part of the base (2). The fixed cover plate (3) has a movable cover plate (4) on its side. The fixed cover plate (3) can seal the inlet (11), and the movable cover plate (4) can seal the outlet (12). A second cylinder (24) is connected to the side of the movable cover plate (4). The second cylinder (24) is connected to the base (2). The fixed cover plate (3) includes an air inlet pipe (33) and a first sensor (34) connected to the air inlet pipe (33). The air inlet pipe (33) can communicate with the inlet (11). The movable cover plate (4) includes a second inner cover (6) and a second sensor (41). The second inner cover (6) has an airflow channel (61) inside. The airflow channel (61) can communicate with the outlet (12). Large flow air... The body squeezes the diaphragm (15) so that the inlet (11) and outlet (12) are directly connected. The sensing head of the second sensor (41) is inserted into the airflow channel (61). The flow rate of the gas is detected by the third sensor (42) in the airflow channel (61). By observing the parameters of the second sensor (41) and the third sensor (42), it can be determined whether the low-pressure internal leakage and high-pressure internal leakage are qualified. A pilot valve switch (9) is provided above the base (2). The pilot valve switch (9) can be connected to or disconnected from the pilot valve. The pilot valve switch (9) is raised and lowered by the first cylinder (23). A support frame (22) is fixed on the upper part of the base (2). The upper end of the first cylinder (23) is fixed to the support frame (22). The telescopic rod of the first cylinder (23) is connected to the pilot valve switch (9). The movable cover (4) includes a second outer cover (5), and a second inner cover (6) is installed inside the second outer cover (5). A sealed mounting cavity (43) is formed between the second outer cover (5) and the second inner cover (6). The mounting cavity (43) is isolated from the airflow channel (61). A lifting plate (8) is installed inside the mounting cavity (43). The lifting plate (8) can be moved and inserted into the airflow channel (61) and block the airflow channel (61). The sensing head of the second sensor (41) is located directly above the lifting plate (8). The mounting cavity (43) is provided with an adjusting block (7). The lower part of the lifting plate (8) abuts against the upper part of the adjusting block (7). The adjusting block (7) can move horizontally and push the lifting plate (8) upward. The upper part of the adjusting block (7) includes a first step (71), a second step (72), and a third step (73). The first step (71) and the second step (72) are connected by a ramp (74). The second step (72) and the third step (73) are connected by a ramp (74). During the transition, when the lower part of the lifting plate (8) abuts against the upper part of the first step (71), the upper surface of the lifting plate (8) is lower than the lower part of the airflow channel (61); when the lower part of the lifting plate (8) abuts against the upper part of the second step (72), the upper surface of the lifting plate (8) is higher than the lower part of the airflow channel (61) and lower than the upper part of the airflow channel (61); when the lower part of the lifting plate (8) abuts against the third step (73), the lifting plate (8) can block the airflow channel (61). A motor (25) is provided on the outside of the second outer cover (5). The drive shaft end of the motor (25) is connected to a sleeve (26). The sleeve (26) is located in the mounting cavity (43). The motor (25) is sealed to the second outer cover (5). A horizontal push rod (75) is provided on the side of the adjusting block (7). The other end of the push rod (75) is provided with a threaded part (76). The threaded part (76) is inserted into the sleeve (26) and threadedly connected to the sleeve (26). Rotating the sleeve (26) can drive the push rod (75) to move and push the adjusting block (7) to move.

2. The dual-flow solenoid valve performance testing device as described in claim 1, characterized in that: The second outer cover (5) is provided with a first support rib (51) inside, the push rod (75) passes through the first support rib (51), the push rod (75) is provided with a first limiting rib (77) on the outside, and a return spring (78) is sleeved on the outside of the push rod (75). The two ends of the return spring (78) abut against the first support rib (51) and the first limiting rib (77) respectively.

3. The dual-flow solenoid valve performance testing device as described in claim 1, characterized in that: The airflow channel (61) is provided with an annular groove (62), and a sealing sleeve (63) is provided in the annular groove (62). The lifting plate (8) abuts against the sealing sleeve (63) on both sides, and the upper end of the lifting plate (8) can be inserted into the annular groove (62).

4. The dual-flow solenoid valve performance testing device as described in claim 1, characterized in that: The lifting plate (8) is provided with a second limiting rib (81) on the outside, and a rectangular spring (82) is sleeved on the outside of the lifting plate (8). The lower part of the rectangular spring (82) abuts against the upper part of the second limiting rib (81), and the upper part of the rectangular spring (82) abuts against the upper surface of the mounting cavity (43).

5. A method for testing the performance of a dual-flow solenoid valve, comprising testing using a dual-flow solenoid valve performance testing device as described in any one of claims 1-4, characterized in that: This includes valve body (1) installation, high flow rate test, low flow rate test, low pressure internal leakage test, high pressure internal leakage test and high pressure external leakage test; Valve body (1) installation steps: S1. Place the valve body (1) on the upper part of the base (2), with the inlet (11) of the valve body (1) abutting against the fixed cover plate (3); S2, the second cylinder (24) pushes the movable cover plate (4) to move so that the movable cover plate (4) abuts against the outlet (12) of the valve body (1), the inlet (11) is sealed by the fixed cover plate (3), and the outlet (12) is sealed by the movable cover plate (4). S3. The first cylinder (23) drives the pilot valve switch (9) to descend, so that the pilot valve switch (9) is connected to the first pilot valve (18) and the second pilot valve (19) respectively, and the valve body (1) is installed. High flow rate test steps: First, control the first pilot valve (18) and the second pilot valve (19) to open by using the pilot valve switch (9); then, pass high flow rate gas through the air inlet pipe (33). The high flow rate gas squeezes the diaphragm (15) to make the inlet (11) and outlet (12) directly connected. The high flow rate gas is discharged to the outside through the airflow channel (61). The flow rate of the gas is detected by the second sensor (41) in the airflow channel (61). At this time, the airflow channel (61) is in a fully open state. The high flow rate test is judged by observing the value on the second sensor (41). Small flow test steps: First, the pilot valve switch (9) controls the first pilot valve (18) to open and the second pilot valve (19) to close; then the motor (25) works to drive the sleeve (26) to rotate, the sleeve (26) pushes the push rod (75) to move, the push rod (75) drives the adjusting block (7) to move, the adjusting block (7) drives the lifting plate (8) to rise to the second stage (72), at this time the airflow channel (61) is in a half-open state; finally, a small flow of gas is introduced into the inlet pipe (33), the small flow of gas flows into the airflow channel (61) from the outlet (12) after passing through the first pilot valve (18), the flow rate increases when passing the position of the lifting plate (8), and the value on the second sensor (41) set at this position is observed to determine whether the small flow test is qualified; Low-pressure internal leakage test steps: First, control the first pilot valve (18) and the second pilot valve (19) to close by using the pilot valve switch (9); then, pass a small flow of gas through the air inlet pipe (33), and judge whether the low-pressure internal leakage is qualified by observing the parameters of the second sensor (41) and the third sensor (42); High pressure internal leakage test steps: First, control the first pilot valve (18) and the second pilot valve (19) to close by using the pilot valve switch (9); then, pass a large flow of gas through the air inlet pipe (33), and judge whether the high pressure internal leakage is qualified by observing the parameters of the second sensor (41) and the third sensor (42); High pressure leakage test steps: First, the pilot valve switch (9) controls the opening of the first pilot valve (18) and the second pilot valve (19); then the adjusting block (7) continues to move and pushes the lifting plate (8) to the third stage (73). At this time, the airflow channel (61) is blocked by the lifting plate (8) so that the valve body (1) is in a sealed state; finally, high pressure gas is introduced into the air inlet pipe (33). By observing the parameters on the first sensor (34) and the third sensor (42), it can be determined whether the high pressure leakage is qualified.

6. The performance testing method for a dual-flow solenoid valve as described in claim 5, characterized in that: The fixed cover plate (3) includes a transparent first outer cover (31). The first outer cover (31) has a first liquid inlet (36) and a first liquid outlet (37) on its upper and lower sides respectively. When the fixed cover plate (3) abuts against the inlet (11), a first liquid storage chamber (35) can be formed between the outer side of the valve body (1) and the first outer cover (31). The movable cover (4) includes a transparent second outer cover (5). The second outer cover (5) has a second liquid inlet (56) and a second liquid outlet (57) on its upper and lower sides respectively. When the movable cover (4) abuts against the outlet (12), a second liquid storage chamber (55) can be formed between the outer side of the valve body (1) and the second outer cover (5). During the testing process, the valve body (1) should ensure the airtightness of the inlet (11) and the fixed cover plate (3) as well as the airtightness of the outlet (12) and the movable cover plate (4). The steps are as follows: The first liquid inlet (36) and the second liquid inlet (56) are connected to an external water source, respectively. The first liquid outlet (37) and the second liquid outlet (57) are closed. Water is passed through the first liquid inlet (36) and the second liquid inlet (56) to fill the first liquid storage chamber (35) and the second liquid storage chamber (55) with water. When testing the valve body (1), observe whether bubbles are generated in the first liquid storage chamber (35) and the second liquid storage chamber (55).

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