A solenoid valve leak detection welding tool and leak detection welding method

Abstract

The application relates to the field of test tools of electromagnetic valves, and discloses a kind of electromagnetic valve leak detection welding tools, and the electromagnetic valve leak detection welding tool includes first positioning plate, second positioning plate and welding seam positioning plate between first positioning plate and second positioning plate;First positioning plate and second positioning plate are provided with corresponding positioning holes, welding seam positioning plate is provided with corresponding positioning threaded holes with positioning hole, to be measured electromagnetic valve is located between first positioning plate and second positioning plate, welding seam positioning plate is attached to the outlet valve seat of to be measured electromagnetic valve, and fastening bolt passes through positioning hole and positioning threaded hole and fastening nut cooperation realizes the fixation of to be measured electromagnetic valve.The electromagnetic valve leak detection welding tool can ensure that the position of the outlet valve seat after testing is unchanged, thereby ensuring that the inspection result of the battery valve is reliable.

Description

Technical Field

[0001] This invention relates to the field of testing fixtures for solenoid valves, and more specifically to a welding fixture and welding method for leak testing of solenoid valves. Background Technology

[0002] Solenoid valves in on-orbit satellite electric propulsion systems are mainly used to control the on / off of high-pressure gas propellants and are an important component of the propulsion system.

[0003] Since electric propulsion engines are generally small-thrust engines used to adjust the attitude of satellites, the diameter of the solenoid valve is less than 0.5mm and the pressure is less than 20MPa. Therefore, the weight and volume of the solenoid valve must be designed to be as small as possible. Thus, the outlet valve seat of the solenoid valve is connected to the solenoid valve body by plugging, and then the connection end face is welded and fixed.

[0004] Before welding, solenoid valves require a leak rate test. During the leak rate test, the outlet valve seat is first pressed against the solenoid valve body by a tool. Under pressure, the outlet valve seat presses against the solenoid valve body and achieves a seal. Then, the solenoid valve is connected to an air source, and the leak rate is compared to determine if the solenoid valve passes the leak rate test. After passing the test, the tooling must be removed before welding the weld seam. However, because the solenoid valve has an internal reset mechanism, the outlet valve seat may shift in position after tooling removal due to the reset force. This can cause a misalignment between the outlet valve seat and the solenoid valve body, ultimately leading to a worse leak rate or even a failure to meet the leak rate requirements after welding. Summary of the Invention

[0005] To overcome the problem in existing technologies where the outlet valve seat of the solenoid valve may become misaligned after the test fixture is removed following the completion of the leak rate test, resulting in a poorer leak rate or even a failure to meet the leak rate requirements of the welded solenoid valve, this invention provides a solenoid valve leak test welding fixture. This fixture can ensure that the outlet valve seat position remains unchanged after the test, thereby ensuring the reliability of the solenoid valve's inspection results.

[0006] To achieve the above objectives, the present invention provides a welding fixture for testing the leakage of a solenoid valve, the welding fixture for testing the leakage of a solenoid valve includes a first positioning plate, a second positioning plate and a weld positioning plate located between the first positioning plate and the second positioning plate;

[0007] The first positioning plate and the second positioning plate are provided with corresponding positioning holes. The weld positioning plate is provided with positioning threaded holes corresponding to the positioning holes. The solenoid valve to be tested is located between the first positioning plate and the second positioning plate. The weld positioning plate is attached to the outlet valve seat of the solenoid valve to be tested. The fastening bolt passes through the positioning hole and cooperates with the positioning threaded hole and the fastening nut to fix the solenoid valve to be tested.

[0008] Preferably, the second positioning plate is located near the outlet valve seat, and a weld fastening plate for sealing the outlet valve seat and the body of the solenoid valve under test is provided between the second positioning plate and the weld positioning plate.

[0009] Preferably, the weld fastening plate includes a pressing end face and a pressing rod fixedly connected to the pressing end face. The pressing rod abuts against the outlet valve seat. The weld positioning plate is provided with a through hole that cooperates with the pressing rod. The end face of the second positioning plate facing the weld fastening plate is recessed inward to form a pressing groove that cooperates with the pressing end face.

[0010] Preferably, the clamping rod abuts against the edge of the outlet valve seat.

[0011] Preferably, the through holes correspond one-to-one with the positioning threaded holes, the line connecting the centers of the corresponding through holes and the positioning threaded holes passes through the center of the weld positioning plate, and the line connecting the centers of two oppositely arranged through holes passes through the center of the weld positioning plate.

[0012] Preferably, the plurality of positioning threaded holes are located on the same circumference, and the plurality of positioning threaded holes are evenly distributed on the circumference.

[0013] Preferably, the end of the first positioning plate away from the solenoid valve is further provided with an inlet nozzle and an inlet channel connected to the inlet nozzle, and the inlet of the solenoid valve to be tested cooperates with the inlet channel;

[0014] The second positioning plate is further provided with an outlet nozzle and an outlet channel connected to the outlet nozzle at the end away from the solenoid valve, and the outlet of the solenoid valve under test is matched with the outlet channel.

[0015] Preferably, a first sealing ring is provided in the inlet channel, and the first sealing ring cooperates with the inlet of the solenoid valve under test to achieve a seal;

[0016] A second sealing ring is provided in the outlet channel, and the second sealing ring cooperates with the outlet of the solenoid valve under test to achieve a seal.

[0017] Preferably, a sealing gasket is provided between the first positioning plate and the second positioning plate and the solenoid valve under test, and a sealing groove is provided inwardly on the end face of the first positioning plate and the second positioning plate facing the solenoid valve under test. The sealing groove cooperates with the sealing gasket to seal the inlet channel and the outlet channel.

[0018] The present invention also provides a leak detection welding method for a solenoid valve, the leak detection welding method comprising:

[0019] The first step is to fix the solenoid valve to be tested in the fixture and perform a leak rate test.

[0020] The second step is to weld the outlet valve seat and the solenoid valve body together while keeping the relative position of the outlet valve seat and the solenoid valve body unchanged.

[0021] According to the above technical solution, the first positioning plate, the second positioning plate, and the solenoid valve under test can be fixed in relative positions through the cooperation of the fastening bolts and fastening nuts. The welded positioning plate located between the first and second positioning plates compresses the outlet valve seat to maintain a relative seal between the outlet valve seat and the body of the solenoid valve under test. In this case, a leak rate test can be performed on the solenoid valve under test.

[0022] After the leak rate test is completed, since the outlet valve seat is positioned by the engagement of the positioning threaded hole and the fastening bolt, the relative position between the weld positioning plate and the solenoid valve under test remains unchanged after the fastening nut is unscrewed. That is, after unscrewing the fastening nut, the effective fixation between the outlet valve seat and the solenoid valve body under test can still be guaranteed, and the outlet valve seat will not be misaligned. At this time, welding the outlet valve seat and the solenoid valve body under test can ensure that the sealing state of the solenoid valve after welding is consistent with the sealing state of the solenoid valve during measurement, thus ensuring the reliability of the test results. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of a welding fixture for leak testing of a solenoid valve;

[0024] Figure 2 This is a front view of a weld fastening plate;

[0025] Figure 3 yes Figure 2 Cross-sectional view;

[0026] Figure 4 This is a front view of a weld seam positioning plate;

[0027] Figure 5 yes Figure 4 Cross-sectional view.

[0028] Explanation of reference numerals in the attached figures

[0029] 1 First positioning plate 2 Second positioning plate

[0030] 3 weld seam positioning plate 4 positioning holes

[0031] 31 positioning threaded hole 5 outlet valve seat

[0032] 61 Fastening bolts 10 Solenoid valve body under test

[0033] 62 Fastening Nuts 7 Weld Fastening Plates

[0034] 71 Clamping end face 72 Clamping rod

[0035] 32 through hole 24 clamping groove

[0036] 11 Inlet nozzle 12 Inlet passage

[0037] 13 First sealing ring 21 Outlet nozzle

[0038] 22 Outlet channel 23 Second sealing ring

[0039] 81 Sealing gasket 82 Sealing groove Detailed Implementation

[0040] In this invention, unless otherwise stated, directional terms such as “between,” “near,” “inward,” “circumferential,” and “far away” generally refer to the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term.

[0041] See Figure 1 The aforementioned electromagnetic valve leak detection welding fixture includes a first positioning plate 1, a second positioning plate 2, and a weld positioning plate 3 located between the first positioning plate 1 and the second positioning plate 2.

[0042] The first positioning plate 1 and the second positioning plate 2 are provided with corresponding positioning holes 4. The weld positioning plate 3 is provided with positioning threaded holes 31 corresponding to the positioning holes 4. The solenoid valve to be tested is located between the first positioning plate 1 and the second positioning plate 2. The weld positioning plate 3 is attached to the outlet valve seat 5 of the solenoid valve to be tested. The fastening bolt 61 passes through the positioning hole 4 and the positioning threaded hole 31 and cooperates with the fastening nut 62 to fix the solenoid valve to be tested.

[0043] By implementing the above technical solution, after the solenoid valve under test is installed in place, the first positioning plate 1, the second positioning plate 2, and the solenoid valve under test can be fixed in relative positions through the cooperation of the fastening bolts 61 and the fastening nuts 62. The weld positioning plate 3 located between the first positioning plate 1 and the second positioning plate 2 maintains a relative seal between the outlet valve seat 5 and the body 10 of the solenoid valve under test by pressing the outlet valve seat 5. In this case, a leak rate test can be performed on the solenoid valve under test.

[0044] After the leak rate test is completed, since the outlet valve seat 5 is engaged with the fastening bolt 61 through the positioning threaded hole 31, the relative position between the weld positioning plate 3 and the solenoid valve under test is still maintained after the fastening nut 62 is unscrewed. That is, after the fastening nut 62 is unscrewed, the effective fixation between the outlet valve seat 5 and the solenoid valve body 10 under test can still be guaranteed, and the outlet valve seat 5 will not be misaligned. At this time, welding the outlet valve seat 5 and the solenoid valve body 10 under test can ensure that the sealing state of the solenoid valve after welding is consistent with the sealing state of the solenoid valve during measurement, thus ensuring the reliability of the test results.

[0045] In this embodiment, preferably, the second positioning plate 2 is close to the outlet valve seat 5 of the solenoid valve to be tested, and a weld fastening plate 7 for sealing the outlet valve seat 5 and the body 10 of the solenoid valve to be tested is provided between the second positioning plate 2 and the weld positioning plate 3.

[0046] The outlet valve seat 5 is compressed by the weld seam fastening plate 7, so that the outlet valve seat 5 and the solenoid valve body 10 under test are in a relatively sealed state under the action of this pressure. In this sealed state, after the weld seam positioning plate 3 and the fastening bolt 61 are tightened, the relative position between the outlet valve seat 5 and the solenoid valve body 10 under test can be locked, so that the outlet valve seat 5 and the solenoid valve body 10 under test can maintain this sealed state until the test is completed. Welding is then completed in this sealed state, so that the sealing state of the final product solenoid valve is consistent with the sealing state during the test.

[0047] When it is necessary to seal between the outlet valve seat 5 and the solenoid valve body 10 under test, the outlet valve seat 5 can be brought closer to the solenoid valve body 10 under test by squeezing the weld positioning plate 3. After the test is completed, the outlet valve seat 5 and the solenoid valve body 10 under test need to be welded. In actual operation, since the weld positioning plate 3 is flat, it may block the welding position and affect the operator's welding operation of the outlet valve seat 5.

[0048] In one embodiment, the weld fastening plate 7 can be configured with multiple pressure rods. By pressing the multiple pressure rods against the outlet valve seat 5, the outlet valve seat 5 moves closer to the solenoid valve body 10 under test. When the outlet valve seat 5 moves closer to the solenoid valve body 10 under test to a certain extent, the outlet valve seat 5 can no longer move, thus achieving a seal between the outlet valve seat 5 and the solenoid valve body 10 under test. When welding of the outlet valve seat 5 is required, the weld fastening plate 7 can be removed to expose the welding position of the outlet valve seat 5, thereby obtaining operating space.

[0049] In this embodiment, preferably, see Figure 2-3The weld fastening plate 7 includes a pressing end face 71 and a pressing rod 72 fixed to the pressing end face 71. The pressing rod 72 abuts against the outlet valve seat 5. The weld positioning plate 3 is provided with a through hole 32 that cooperates with the pressing rod 72. The end face of the second positioning plate 2 facing the weld fastening plate 7 is recessed inward to form a pressing groove 24 that cooperates with the pressing end face 71.

[0050] When it is necessary to press the outlet valve seat 5, this can be achieved by pressing the pressing end face 71. During the tightening of the fastening nut 62, the fastening nut 62 will push the second positioning plate 2 closer and closer to the first positioning plate 1. During this process, the second positioning plate 2 will press the weld fastening plate 7 and the weld positioning plate 3, and finally push the outlet valve seat 5 to press against the solenoid valve body 10 under test, thus achieving the sealing operation of the solenoid valve.

[0051] Using this solenoid valve leak testing welding fixture, first insert the inlet of the solenoid valve under test into the inlet channel 12, and the outlet through the weld positioning plate 3, then screw in the fastening bolt 61; then, mate the weld fastening plate 7 with the weld positioning plate 3, and press the weld fastening plate 7 while tightening the fastening bolt 61; next, fit the outlet channel 22 onto the outlet of the solenoid valve under test, mate the positioning hole 4 with the fastening bolt 61, and tighten the fastening nut 62; after completing the relative fixation of the solenoid valve under test, the leak rate test of the solenoid valve under test can begin.

[0052] After the leak rate test is completed, remove the fastening nut 62 and the second positioning plate 2. At this time, the weld positioning plate 3 still maintains its relative position with the first positioning plate 1 under the action of the fastening bolt 61. Therefore, the position of the outlet valve seat 5 remains unchanged. At this time, the outlet valve seat 5 can be welded to the solenoid valve body 10 to be tested.

[0053] In the above process, the solenoid valve to be tested is first fixed between the weld positioning plate 3 and the first positioning plate 1 by fastening bolt 61, so that the solenoid valve to be tested and the solenoid valve leak testing welding fixture are relatively fixed. Then, the weld positioning plate 3 is pushed by pressing the weld fastening plate 7 to squeeze the outlet valve seat 5, while tightening the fastening bolt 61 until it is impossible to tighten the fastening bolt 61 further. At this time, the seal between the outlet valve seat 5 and the body 10 of the solenoid valve to be tested is achieved. Since the fastening bolt 61 cooperates with the positioning threaded hole 31 on the weld positioning plate 3, the outlet valve seat 5 and the body 10 of the solenoid valve to be tested can maintain this sealing state.

[0054] Next, install the second positioning plate 2 and tighten it onto the solenoid valve leak testing welding fixture using the fastening nut 62. The leak rate test of the solenoid valve under test can then begin. After the test, remove the second positioning plate 2 and the weld fastening plate 7. The position of the weld positioning plate 3 remains unchanged, therefore, the outlet valve seat 5 and the solenoid valve body 10 under test maintain their original sealing state. Welding can then be performed on the outlet valve seat 5 and the solenoid valve body 10 under test. After welding, the relative position between the outlet valve seat 5 and the solenoid valve body 10 under test will not change; that is, the sealing state of the solenoid valve under test will not change during testing or after welding.

[0055] Preferably, the clamping rod 72 acts on the edge of the outlet valve seat 5. Before welding the outlet valve seat 5 to the solenoid valve body 10 to be tested, the weld fastening plate 7 is removed. Then, the edge of the outlet valve seat 5 that is blocked by the clamping rod 72 will be exposed in the through hole 32. The operator can spot weld the outlet valve seat 5 to the solenoid valve body to be tested through the through hole 32.

[0056] The clamping rod 72 acts on the edge of the outlet valve seat 5 to achieve a better squeezing effect on the outlet valve seat 5. On the other hand, after the test is completed, removing the weld fastening plate 7 will expose the edge of the outlet valve seat 5, allowing the operator to perform spot welding on the exposed area. After spot welding, the position between the outlet valve seat 5 and the solenoid valve body 10 under test can be guaranteed by these weld points. Finally, after removing all the workpieces, a full weld can be performed between the outlet valve seat 5 and the solenoid valve body 10 under test, while also ensuring that the position of the outlet valve seat 5 remains unchanged.

[0057] After all the positions corresponding to the clamping rod 72 have been spot welded, the weld positioning plate 3 can be removed, and the weld between the outlet valve seat 5 and the body 10 of the solenoid valve under test can be fully welded to further ensure the sealing effect of the solenoid valve under test.

[0058] In this embodiment, preferably, the through holes 32 and the positioning threaded holes 31 are in one-to-one correspondence, the line connecting the corresponding through holes 32 and the positioning threaded holes 31 passes through the center of the weld positioning plate 3, and the line connecting the centers of the two opposite through holes 32 passes through the center of the weld positioning plate 3.

[0059] Two through holes 32, positioned opposite each other, are located on the same diameter of the weld positioning plate 3. Two corresponding positioning threaded holes 3 are also provided on the same diameter. When the clamping rod 72 presses against the outlet valve seat 5 through the through holes 3, the two clamping rods 72 on the same diameter can push the outlet valve seat 5 to move stably. Simultaneously, the cooperation between the fastening nut 62 and the fastening bolt 61 prevents the central axes of the fastening nut 62 and the fastening bolt 61 from becoming misaligned.

[0060] In this embodiment, preferably, the plurality of positioning threaded holes 31 are located on the same circumference, and the plurality of positioning threaded holes 31 are evenly distributed on the circumference.

[0061] By evenly distributing the positioning threaded holes 31 and tightening the fastening nuts 62 in turn, it is possible to avoid the situation where the central axes of the fastening nuts 62 and the fastening bolts 61 are not collinear, thus preventing the situation where the central axes of the two are not aligned.

[0062] Preferably, two fastening nuts 62 located on the same diameter are considered as a group, and a group of fastening nuts 62 are fastened simultaneously, while fastening nuts 62 from different groups are fastened in turn.

[0063] In this embodiment, preferably, the first positioning plate 1 is also provided with an inlet nozzle 11 and an inlet channel 12 connected to the inlet nozzle 11 at the end located away from the solenoid valve, and the inlet of the solenoid valve under test is matched with the inlet channel 12.

[0064] The second positioning plate 2 is also provided with an outlet nozzle 21 and an outlet channel 22 connected to the outlet nozzle 21 at the end located away from the solenoid valve. The outlet of the solenoid valve under test is matched with the outlet channel 22.

[0065] The inlet nozzle 11 is a transfer nozzle between the test product and the test medium. Because the gas source medium used in the test is under high pressure, the material of the inlet nozzle 11 is preferably high-strength stainless steel. The part of the inlet nozzle 11 that connects to the gas source device has an external thread for easy connection. An inlet channel 12 is provided in the center. The straight pipe of the inlet end of the solenoid valve to be tested is inserted into the inlet channel 12 to connect it to the gas source.

[0066] The outlet nozzle 21 has a similar structure to the inlet nozzle 11, and the part that connects to the gas source device is externally threaded. The straight pipe at the outlet end of the solenoid valve under test is inserted into the outlet channel 22. High-pressure gas flows out through the outlet channel 22 after passing through the solenoid valve.

[0067] During measurement, the leakage rate of the solenoid valve under test needs to be tested in all position states of the valve core. During the test, the amount of compressed air flowing in from the inlet nozzle 11 and the amount of compressed air flowing out from the outlet nozzle 21 need to be measured simultaneously, and the two values ​​are compared to determine whether the difference between them meets the qualified requirements of the leakage rate test. If it meets the requirements, the leakage rate of the solenoid valve under test is qualified; otherwise, the leakage rate of the solenoid valve under test is unqualified.

[0068] In this embodiment, preferably, a first sealing ring 13 is provided in the inlet channel 12, and the first sealing ring 13 cooperates with the inlet of the solenoid valve to be tested to achieve a seal;

[0069] A second sealing ring 23 is provided in the outlet channel 22. The second sealing ring 23 cooperates with the outlet of the solenoid valve under test to achieve a seal.

[0070] To prevent leakage between the inlet and outlet straight pipes of the solenoid valve under test and the leak detection welding fixture, a first sealing ring 13 and a second sealing ring 23 are respectively installed in the inlet channel 12 and the outlet channel 22. The first sealing ring 13 and the second sealing ring 23 cooperate with the inlet and outlet of the solenoid valve under test, respectively, to achieve sealing between the inlet channel 12 and the inlet straight pipe of the solenoid valve under test, and sealing between the outlet channel 22 and the outlet straight pipe of the solenoid valve under test.

[0071] The above sealing operation can prevent gas leakage between the solenoid valve leak test welding fixture and the solenoid valve under test from affecting the leak test results of the solenoid valve.

[0072] In this embodiment, preferably, a sealing gasket 81 is provided between the first positioning plate 1 and the second positioning plate 2 and the solenoid valve to be tested. The end faces of the first positioning plate 1 and the second positioning plate 2 facing the solenoid valve to be tested are recessed inward to provide a sealing groove 82. The sealing groove 82 cooperates with the sealing gasket 81 to seal the inlet channel 12 and the outlet channel 22.

[0073] The sealing gasket 81 is installed in the sealing groove 82. The sealing gasket 81 is made of soft polytetrafluoroethylene material. The end faces of both ends of the solenoid valve under test are pressed onto the two sealing gaskets 81 respectively, forming a second seal on the inlet side and the outlet side. This can further prevent gas from flowing out between the solenoid valve under test and the solenoid valve leak test welding fixture, thus affecting the accuracy of the test of the solenoid valve leak test welding fixture.

[0074] The sealing gasket 81, which is attached to the end face of the solenoid valve, can prevent the end face of the solenoid valve under test from being damaged by the tooling during repeated testing and disassembly. At the same time, the sealing gasket 81 acts as a buffer and can also prevent the weld sealing plate from being damaged during operation.

[0075] A leak detection welding method, the leak detection welding method comprising:

[0076] The first step is to fix the solenoid valve to be tested in the fixture and perform a leak rate test.

[0077] The second step is to weld the outlet valve seat 5 and the solenoid valve body 10 under test together while keeping the relative positions of the outlet valve seat 5 and the solenoid valve body 10 under test unchanged.

[0078] By implementing the above technical solution, the leakage rate of the solenoid valve is first tested. After the test results show that the leakage rate of the solenoid valve under test is qualified, the outlet valve seat 5 is welded to the body 10 of the solenoid valve under test under the condition that the leakage rate is qualified. This can ensure that the leakage rate of the solenoid valve after welding is qualified.

[0079] Preferably, after the test is completed, in order to obtain the space required for welding, some of the tooling can be disassembled. On the one hand, this ensures that the relative limit between the outlet valve seat 5 and the solenoid valve body 10 under test remains unchanged. On the other hand, the disassembled tooling can provide operating space for welding, so that the operator can weld between the outlet valve seat 5 and the solenoid valve body 10 under test.

[0080] This method ensures that after the leakage rate test is passed, the outlet valve seat 5 and the solenoid valve body 10 under test remain in a relatively sealed state. Welding the outlet valve seat 5 and the solenoid valve body 10 under test in this state ensures that the leakage rate of the welded solenoid valve is consistent with the leakage rate during the test.

[0081] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0082] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0083] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. An electromagnetic valve leak test welding tool characterized by, The electromagnetic valve leak detection welding tool comprises a first positioning plate (1), a second positioning plate (2) and a weld positioning plate (3) located between the first positioning plate (1) and the second positioning plate (2); The first positioning plate (1) and the second positioning plate (2) are respectively provided with a corresponding positioning hole (4), and the weld positioning plate (3) is provided with a positioning threaded hole (31) corresponding to the positioning hole (4); the electromagnetic valve to be detected is located between the first positioning plate (1) and the second positioning plate (2), the weld positioning plate (3) is attached to the outlet valve seat (5) of the electromagnetic valve to be detected, and the fixing bolt (61) passes through the positioning hole (4) and the positioning threaded hole (31) and cooperates with the fixing nut (62) to realize the fixation of the electromagnetic valve to be detected; The second positioning plate (2) is close to the outlet valve seat (5), and the weld fastening plate (7) for sealing the outlet valve seat (5) and the body (10) of the electromagnetic valve to be detected is arranged between the second positioning plate (2) and the weld positioning plate (3); The weld fastening plate (7) comprises a pressing end face (71) and a pressing rod (72) fixedly connected with the pressing end face (71), the pressing rod (72) abuts against the outlet valve seat (5), the weld positioning plate (3) is provided with a through hole (32) matched with the pressing rod (72), and the outlet valve seat (5) and the body of the electromagnetic valve to be detected are fixed by spot welding through the through hole (32); the end face of the second positioning plate (2) facing the weld fastening plate (7) is recessed inward to form a pressing groove (24) matched with the pressing end face (71); The end of the first positioning plate (1) away from the electromagnetic valve is further provided with an inlet nozzle (11) and an inlet channel (12) in communication with the inlet nozzle (11), and the inlet of the electromagnetic valve to be detected cooperates with the inlet channel (12); The end of the second positioning plate (2) away from the electromagnetic valve is further provided with an outlet nozzle (21) and an outlet channel (22) in communication with the outlet nozzle (21), and the outlet of the electromagnetic valve to be detected cooperates with the outlet channel (22); The first sealing ring (13) is arranged in the inlet channel (12), and the first sealing ring (13) cooperates with the inlet of the electromagnetic valve to be detected to realize sealing; The second sealing ring (23) is arranged in the outlet channel (22), and the second sealing ring (23) cooperates with the outlet of the electromagnetic valve to be detected to realize sealing.

2. The electromagnetic valve leak test welding tool of claim 1, wherein, The pressing rod (72) abuts against the edge of the outlet valve seat (5).

3. The electromagnetic valve leak test welding fixture of claim 2, wherein, The through hole (32) corresponds to the positioning threaded hole (31) one by one, the line connecting the centers of the corresponding through hole (32) and the positioning threaded hole (31) passes through the center of the weld positioning plate (3), and the line connecting the centers of the two oppositely arranged through holes (32) passes through the center of the weld positioning plate (3).

4. The electromagnetic valve leak test welding fixture of claim 3, wherein, A plurality of positioning threaded holes (31) are located on the same circumference, and a plurality of positioning threaded holes (31) are uniformly distributed on the circumference.

5. The electromagnetic valve leak test welding fixture of claim 1, wherein, The first positioning plate (1) and the second positioning plate (2) are provided with sealing pads (81) between the electromagnetic valve to be tested, and the end faces of the first positioning plate (1) and the second positioning plate (2) facing the electromagnetic valve to be tested are provided with inwardly recessed sealing grooves (82), which cooperate with the sealing pads (81) to realize sealing of the inlet channel (12) and the outlet channel (22).

6. A method of electromagnetic valve leak testing using the electromagnetic valve leak testing fixture according to any one of claims 1 to 5, characterized by, The method comprises the following steps: Firstly, the electromagnetic valve to be tested is fixed in the tool for leakage rate test; Secondly, after the leakage rate test of the electromagnetic valve to be tested is qualified, the relative position between the outlet valve seat (5) and the electromagnetic valve body (10) to be tested is kept unchanged, and the outlet valve seat (5) and the electromagnetic valve body (10) to be tested are welded.

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