A welded solenoid valve testing and assembly fixture

Abstract

This invention discloses a welded solenoid valve testing and assembly fixture, including an inlet fixture and an outlet fixture arranged opposite each other. The inlet fixture has a through-hole testing inlet in its center, aligned with the inlet of the solenoid valve. The outlet fixture has a through-hole testing outlet in its center, aligned with the outlet of the solenoid valve. The inlet and outlet fixtures are connected by multiple axially extending locking bolts that circumferentially surround the solenoid valve. The fixture also includes a stroke detection rod, an inlet adapter, and an outlet adapter. The stroke detection rod passes through the testing outlet and connects to the valve core of the solenoid valve. The inlet adapter is detachably connected to the testing inlet, and the outlet adapter is detachably connected to the testing outlet. This fixture eliminates the need for frequent fixture loading and unloading, allowing for valve leak rate checks, stroke checks, and valve seat welding. This reduces assembly time, improves testing efficiency, and prevents solenoid valve failure due to excessive leakage rate or loose parts within the valve cavity, thus improving workpiece quality.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve processing, and in particular to a welded solenoid valve testing and assembly fixture. Background Technology

[0002] Electromagnetic valves used in the aerospace field are required to have small dimensions, and the valve seat can only be connected to the housing by welding. The sealing ring on the valve seat and the non-metallic sealing surface of the valve core assembly form a sealing pair. They are widely used in the attitude and orbit control power systems of various spacecraft, mainly for the on / off of rocket or satellite propellant.

[0003] Because the valve seat is connected by welding, this solenoid valve is not reworkable. To meet the various performance indicators of the solenoid valve, the valve stroke and the solenoid valve's sealing leakage rate must be checked during valve installation and adjustment before the valve seat is welded. Only after the solenoid valve stroke and helium leak rate are qualified can the valve seat be spot welded and fixed, and finally the valve seat be welded.

[0004] The current conventional method involves several steps during product assembly and debugging. After checking the valve's stroke, the valve stroke welding clamping fixture needs to be replaced with a helium leak detection fixture. After checking the leak rate, this fixture must be replaced back with the stroke welding clamping fixture to spot weld the valve seat. This frequent fixture changes severely impact assembly efficiency. Furthermore, during the replacement, the relative positions of the valve seat and valve core sealing surfaces may change, potentially causing misalignment of the sealing ring formed by the valve seat and valve core sealing surfaces. This can lead to leak rate exceeding tolerances. If a leak rate exceeds tolerances, since the valve seat has already been spot welded, the valve must be scrapped, the seat removed, and the valve reassembled. Each component within the valve cavity has a dimension that affects the valve stroke and has design tolerances. Based on the design dimensions, after assembly, the valve seat end face may be higher or lower than the solenoid valve assembly end face. Traditional tooling uses the solenoid valve assembly end face as the limit. Therefore, during stroke inspection, if the valve seat end face is lower than the solenoid valve end face, the tooling has not properly clamped the components within the valve cavity, resulting in inconsistent stroke measurements before and after welding. If the stroke exceeds the tolerance after welding, the valve seat must be scrapped and the valve reassembled.

[0005] Therefore, how to provide a welded solenoid valve testing and assembly fixture capable of performing stroke testing and sealing testing is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a welded solenoid valve testing and assembly fixture. After the solenoid valve is clamped and fixed by the inlet and outlet fixtures, the stroke test or sealing test can be performed by changing the stroke test bar or the inlet and outlet adapters, without the need for frequent loading and unloading of the fixtures, thus improving the testing efficiency.

[0007] To solve the above-mentioned technical problems, the present invention provides a welded solenoid valve testing and assembly fixture, including an inlet clamp and an outlet clamp arranged opposite to each other. The front end of the inlet clamp is used to press against the rear end of the solenoid valve housing, and the inlet clamp has a through-hole testing inlet in the middle, which is aligned with the inlet of the solenoid valve. The rear end of the outlet clamp is used to press against the front end of the solenoid valve seat, and the outlet clamp has a through-hole testing outlet in the middle, which is aligned with the outlet of the solenoid valve. The inlet clamp and the outlet clamp are connected by a plurality of axially extending locking bolts, which surround the solenoid valve circumferentially. The fixture also includes a stroke detection rod, an inlet adapter, and an outlet adapter. The stroke detection rod can pass through the testing outlet and connect to the valve core of the solenoid valve. The inlet adapter is detachably connected to the testing inlet, and the outlet adapter is detachably connected to the testing outlet.

[0008] Preferably, the outlet fixture is provided with a plurality of spot welding holes running through the front and back, the spot welding holes being aligned with the joint between the valve seat and the housing, and the plurality of spot welding holes being evenly arranged around the detection outlet.

[0009] Preferably, the front end face of the inlet fixture is provided with a threaded hole, and the corresponding position of the outlet fixture is provided with a locking hole that extends from front to back. The locking bolt passes through the locking hole and connects to the threaded hole of the inlet fixture.

[0010] Preferably, the rear end face of the outlet clamp is provided with a positioning boss, the rear end face of the positioning boss only contacts the front end face of the valve seat, the diameter of the positioning boss is smaller than the diameter of the valve seat, and the axial height of the positioning boss is greater than the upper deviation of the sum of the stroke dimensions of each component of the solenoid valve.

[0011] Preferably, the rear end face of the outlet clamp is provided with an outlet groove, the front end of the housing extends into the outlet groove, and the outer wall of the front end of the housing is sealed and fitted with the inner wall of the outlet groove, and the positioning boss is located in the outlet groove.

[0012] Preferably, the front end of the outlet clamp is provided with a connector, the detection outlet passes through the connector, the outer periphery of the connector is provided with an external thread, and the rear end of the outlet adapter through hole is provided with a threaded hole that fits into the connector.

[0013] Preferably, the front end face of the inlet fixture is provided with an inlet groove, the rear end of the housing extends into the inlet groove, and the outer wall of the rear end of the housing is sealed and fitted with the inner wall of the inlet groove.

[0014] Preferably, the rear end of the inlet fixture is provided with a connecting hole, the detection inlet communicates with the connecting hole, the connecting hole is provided with an internal thread, and the front end of the inlet adapter extends into the connecting hole and is provided with an external thread.

[0015] Preferably, the bottom surface of the inlet groove is provided with a first sealing ring surrounding the detection inlet, the rear end face of the positioning boss is provided with a second sealing ring surrounding the detection outlet, the inner wall of the outlet groove is provided with a third sealing ring, and the rear end face of the outlet adapter is provided with a fourth sealing ring to block the spot weld hole.

[0016] Preferably, filter screen assemblies are provided in both the detection inlet and the outlet adapter through hole, and the filter screen assemblies are pressed together by a soft rubber pad installed in the knife relief groove.

[0017] This invention provides a welded solenoid valve testing and assembly fixture, including an inlet clamp and an outlet clamp arranged opposite to each other. The front end of the inlet clamp is used to press against the rear end of the solenoid valve housing, and a through-hole testing inlet is provided in the middle of the inlet clamp, which is aligned with the inlet of the solenoid valve. The rear end of the outlet clamp is used to press against the front end of the solenoid valve seat, and a through-hole testing outlet is provided in the middle of the outlet clamp, which is aligned with the outlet of the solenoid valve. The inlet clamp and the outlet clamp are connected by a plurality of axially extending locking bolts, which surround the solenoid valve circumferentially. The fixture also includes a stroke detection rod, an inlet adapter, and an outlet adapter. The stroke detection rod can pass through the testing outlet and connect to the valve core of the solenoid valve. The inlet adapter is detachably connected to the testing inlet, and the outlet adapter is detachably connected to the testing outlet.

[0018] During the testing process, the solenoid valve to be tested is placed between the inlet and outlet clamps, and the solenoid valve is clamped by the locking bolts. Then, the stroke test bar is installed to check the stroke. The stroke test bar can also be removed to install the inlet and outlet adapters for helium leak testing. This eliminates the need for frequent clamping and disassembly, reducing assembly time, improving testing efficiency, and preventing the solenoid valve from being scrapped due to excessive leakage rate or loose parts in the valve cavity, thus improving workpiece quality. Attached Figure Description

[0019] Figure 1 A schematic diagram of the stroke test for a specific embodiment of the welding solenoid valve testing and assembly fixture provided by the present invention;

[0020] Figure 2A schematic diagram of a sealing test for a specific embodiment of the welded solenoid valve testing and assembly fixture provided by the present invention;

[0021] Figure 3 A schematic diagram of the structure of the solenoid valve in a specific embodiment of the welded solenoid valve testing and assembly fixture provided by the present invention;

[0022] Figure 4 A schematic diagram of the imported fixture in a specific embodiment of the welded solenoid valve testing and assembly tooling provided by the present invention;

[0023] Figure 5 This is a schematic diagram of the outlet clamp in a specific embodiment of the welded solenoid valve testing and assembly fixture provided by the present invention.

[0024] Figure 6 This is a schematic diagram of the outlet adapter in a specific embodiment of the welded solenoid valve testing and assembly fixture provided by the present invention.

[0025] Among them, the components are: 1. Import clamp, 11. Inspection inlet, 12. Import groove, 13. Connecting hole, 14. First sealing ring, 2. Export clamp, 21. Inspection outlet, 22. Spot welding hole, 23. Positioning boss, 24. Export groove, 25. Connector, 26. Second sealing ring, 27. Third sealing ring, 3. Locking bolt, 4. Stroke detection rod, 5. Import adapter, 6. Export adapter, 61. Fourth sealing ring, 7. Solenoid valve, 8. Filter assembly, 9. Soft rubber pad. Detailed Implementation

[0026] The core of this invention is to provide a welded solenoid valve testing and assembly fixture. After the solenoid valve is clamped and fixed by the inlet and outlet fixtures, the stroke test or sealing test can be performed by changing the stroke test bar or the inlet and outlet adapters. This eliminates the need for frequent loading and unloading of the fixtures and improves testing efficiency.

[0027] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please refer to Figures 1 to 6 , Figure 1 A schematic diagram of the stroke test for a specific embodiment of the welding solenoid valve testing and assembly fixture provided by the present invention; Figure 2 A schematic diagram of a sealing test for a specific embodiment of the welded solenoid valve testing and assembly fixture provided by the present invention; Figure 3 A schematic diagram of the structure of the solenoid valve in a specific embodiment of the welded solenoid valve testing and assembly fixture provided by the present invention; Figure 4 A schematic diagram of the imported fixture in a specific embodiment of the welded solenoid valve testing and assembly tooling provided by the present invention; Figure 5 This is a schematic diagram of the outlet clamp in a specific embodiment of the welded solenoid valve testing and assembly fixture provided by the present invention. Figure 6 This is a schematic diagram of the outlet adapter in a specific embodiment of the welded solenoid valve testing and assembly fixture provided by the present invention.

[0029] This invention provides a welded solenoid valve testing and assembly fixture, including an inlet clamp 1, an outlet clamp 2, a locking bolt 3, a stroke detection rod 4, an inlet adapter 5, and an outlet adapter 6. The inlet clamp 1 and the outlet clamp 2 are arranged opposite to each other, with the inlet clamp 1 located behind the outlet clamp 2, i.e., the front end of the inlet clamp 1 faces the rear end of the outlet clamp 2. The solenoid valve 7 includes a housing 71, a valve core 73 placed inside the housing 71, and a valve seat 72 that seals the front opening of the housing 71.

[0030] The front end of the inlet clamp 1 is used to press against the rear end of the housing 71 of the solenoid valve 7, and the middle of the inlet clamp 1 is provided with a through-hole detection inlet 11, which is aligned with the inlet of the solenoid valve 7. The rear end of the outlet clamp 2 is used to press against the front end of the valve seat 72 of the solenoid valve 7, and the middle of the outlet clamp 2 is provided with a through-hole detection outlet 21, which is aligned with the outlet of the solenoid valve 7. The inlet clamp 1 and the outlet clamp 2 are connected by a plurality of axially extending locking bolts 3, which surround the solenoid valve 7 circumferentially. Specifically, the front end face of the inlet clamp 1 is provided with a threaded hole, and the corresponding position of the outlet clamp 2 is provided with a through-hole locking hole. During installation, the locking bolts 3 pass through the locking hole and are rotated into the threaded hole of the inlet clamp 1, pulling the inlet clamp 1 and the outlet clamp 2 closer and locking them, pressing the valve core 73 and the valve seat 72 into the housing 71.

[0031] During the testing process, the solenoid valve 7 to be tested is placed between the inlet clamp 1 and the outlet clamp 2, and the solenoid valve 7 is clamped by the locking bolt 3. Then, the stroke test bar 4 is passed through the test outlet 21 and connected to the valve core 73 to perform a stroke check. Alternatively, the stroke test bar 4 can be disassembled so that the inlet adapter 5 is connected to the inlet clamp 1 and the outlet adapter 6 is connected to the outlet clamp 2 to perform a helium leak test. The test medium is delivered from the source to the inlet adapter 5, enters the inlet of the solenoid valve 7 through the test inlet 11, and then reaches the test outlet 12 through the outlet of the solenoid valve 7, and is discharged through the outlet adapter 6 to perform a helium leak test.

[0032] During the testing process, there is no need to frequently load and unload fixtures, which reduces assembly time, improves testing efficiency, avoids excessive leakage rate during helium testing and failure of solenoid valves due to loose parts in the valve cavity, and improves workpiece quality.

[0033] Furthermore, spot welding is required at the joint between the valve seat 72 and the housing 71 under clamping conditions to fix the positions of the valve seat 72 and the housing 71 and prevent misalignment of the valve seat 72. Multiple spot welding holes 22 penetrating from front to back are provided on the outlet fixture 2. The spot welding holes 22 are aligned with the joint between the valve seat 72 and the housing 71. After testing, a tool can be inserted into the spot welding holes 22 to spot weld the joint between the valve seat 72 and the housing 71. Spot welding of the valve seat 72 can be performed directly without changing the tooling. Finally, the valve seat 72 is ring welded. Preferably, the multiple spot welding holes 22 are evenly arranged around the test outlet 21. The number and arrangement of the spot welding holes 22 can be adjusted according to the situation, all within the protection scope of this invention.

[0034] In the welding-type solenoid valve testing and assembly fixture provided in the specific embodiment of the present invention, a positioning boss 23 is provided on the rear end face of the outlet fixture 2. The rear end face of the positioning boss 23 only contacts the front end face of the valve seat 72. The diameter of the positioning boss 23 is smaller than the diameter of the valve seat 72, and the axial height of the positioning boss 23 is greater than the upper deviation of the sum of the stroke dimensions of each component of the solenoid valve 7. Various parts are assembled inside the housing 71 of the solenoid valve 7, and the valve stroke is determined by the height dimensions of these parts. To ensure the accuracy of the stroke measurement, various parts need to be pressed tightly within the valve cavity of the housing 71. Therefore, during assembly, the end face of the valve seat 72 limits the movement, pressing each part tightly within the valve cavity of the housing 71.

[0035] To ensure stable installation of the solenoid valve 7, an outlet groove 24 is provided on the rear end face of the outlet clamp 2. The shape and size of the outlet groove 24 match the front end of the housing 71. The front end of the housing 71 extends into the outlet groove 24, and the outer wall of the front end of the housing 71 is sealed and fitted with the inner wall of the outlet groove 24. The positioning boss 23 is located in the outlet groove 24.

[0036] Furthermore, the front end of the outlet clamp 2 is provided with a connector 25, the detection outlet 21 passes through the connector 25, the outer periphery of the connector 25 is provided with external threads, the rear end of the through hole of the outlet adapter 6 is provided with a threaded hole, which is fitted onto the connector 25, and the two are connected by threads.

[0037] The front end face of the imported clamp 1 is provided with an imported groove 12. The shape and size of the imported groove 12 match the rear end of the housing 71. The rear end of the housing 71 extends into the imported groove 12, and the outer wall of the rear end of the housing 71 is sealed and fitted with the inner wall of the imported groove 12.

[0038] Furthermore, the rear end of the imported clamp 1 is provided with a connecting hole 13, the inspection inlet 11 communicates with the connecting hole 13, the connecting hole 13 is provided with an internal thread, the front end of the imported adapter 5 extends into the connecting hole 13 and is provided with an external thread, and the two are connected by threads. The above method facilitates quick installation and disassembly. Other connection methods can also be used, such as snap-fit ​​connections, all of which are within the protection scope of this invention.

[0039] To prevent helium leakage during the sealing test, the sealing performance of the equipment needs to be improved. The bottom surface of the inlet groove 12 is provided with a first sealing ring 14 surrounding the detection inlet 11 to achieve a seal between the inlet clamp 1 and the housing 71. The rear end face of the positioning boss 23 is provided with a second sealing ring 26 surrounding the detection outlet 21. The inner wall of the outlet groove 24 is provided with a third sealing ring 27 to achieve a seal between the outlet clamp 2 and the housing 71. At the same time, the rear end face of the outlet adapter 6 is provided with a fourth sealing ring 61 to seal the spot weld hole 22 to prevent helium from leaking from the spot weld hole 22.

[0040] Based on the welding solenoid valve testing and assembly fixtures provided in the above specific embodiments, filter screen assemblies 8 are provided in the through holes of the testing inlet 11 and the outlet adapter 6, and the filter screen assemblies 8 are pressed by the soft rubber pads 9 installed in the knife relief groove.

[0041] To prevent unwanted substances from entering the valve cavity, a filter assembly 8 is designed on the inlet clamp 1. The filtration accuracy of the filter assembly 8 is greater than that of the valve's own filter, and the equivalent flow area of ​​the filter assembly 8 is greater than that of the valve's own filter.

[0042] The filter assembly 8 is designed to be replaceable. To reduce tooling size, the filter assembly 8 should not be designed with a threaded connection. Instead, the filter assembly 8 is positioned below the internal thread relief groove of the detection inlet 11 of the inlet fixture 1. A soft rubber pad 9 is placed inside the relief groove to press and limit the filter assembly 8. The outer diameter of the soft rubber pad 9 is slightly smaller than the groove diameter, and the thickness is slightly smaller than the groove height. This soft rubber pad 9 can also be used for sealing between the inlet adapter 5 and the inlet fixture 1. The filter assembly 8 and the soft rubber pad 9 can also be installed in the through hole of the outlet adapter 6 in the same way.

[0043] The above provides a detailed description of the welded solenoid valve testing and assembly fixture provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A welded solenoid valve testing and assembly fixture, characterized in that, The device includes an inlet clamp (1) and an outlet clamp (2) arranged opposite to each other. The front end of the inlet clamp (1) is used to press against the rear end of the housing (71) of the solenoid valve (7), and a detection inlet (11) that runs through the front and back is provided in the middle of the inlet clamp (1), which is aligned with the inlet of the solenoid valve (7). The rear end of the outlet clamp (2) is used to press against the front end of the valve seat (72) of the solenoid valve (7), and a detection outlet (21) that runs through the front and back is provided in the middle of the outlet clamp (2), which is aligned with the inlet of the solenoid valve (7). The outlet, the inlet clamp (1) and the outlet clamp (2) are connected by a plurality of axially extending locking bolts (3), the plurality of locking bolts (3) surround the solenoid valve (7) in the circumferential direction, and also includes a stroke detection rod (4), an inlet adapter (5) and an outlet adapter (6). The stroke detection rod (4) can pass through the detection outlet (21) and connect to the valve core (73) of the solenoid valve (7). The inlet adapter (5) is detachably connected to the detection inlet (11), and the outlet adapter (6) is detachably connected to the detection outlet (21). The outlet clamp (2) is provided with a plurality of spot welding holes (22) that run through the front and back. The spot welding holes (22) are aligned with the joint between the valve seat (72) and the housing (71). The plurality of spot welding holes (22) are evenly arranged around the detection outlet (21). The rear end face of the outlet adapter (6) is provided with a fourth sealing ring (61) to seal the spot welding holes (22).

2. The welded solenoid valve testing and assembly fixture according to claim 1, characterized in that, The front end face of the inlet clamp (1) is provided with a threaded hole, and the corresponding position of the outlet clamp (2) is provided with a locking hole that runs through the front and rear. The locking bolt (3) passes through the locking hole and connects to the threaded hole of the inlet clamp (1).

3. The welded solenoid valve testing and assembly fixture according to claim 2, characterized in that, The rear end face of the outlet clamp (2) is provided with a positioning boss (23). The rear end face of the positioning boss (23) only contacts the front end face of the valve seat (72). The diameter of the positioning boss (23) is smaller than the diameter of the valve seat (72). The axial height of the positioning boss (23) is greater than the upper deviation of the sum of the stroke dimensions of each component of the solenoid valve (7).

4. The welded solenoid valve testing and assembly fixture according to claim 3, characterized in that, The outlet clamp (2) has an outlet groove (24) on its rear end face. The front end of the housing (71) extends into the outlet groove (24), and the outer wall of the front end of the housing (71) is sealed and fitted with the inner wall of the outlet groove (24). The positioning boss (23) is located in the outlet groove (24).

5. The welded solenoid valve testing and assembly fixture according to claim 4, characterized in that, The front end of the outlet clamp (2) is provided with a connector (25), the detection outlet (21) passes through the connector (25), the outer periphery of the connector (25) is provided with an external thread, and the rear end of the through hole of the outlet adapter (6) is provided with a threaded hole fitted into the connector (25).

6. The welded solenoid valve testing and assembly fixture according to claim 5, characterized in that, The front end face of the imported clamp (1) is provided with an imported groove (12), the rear end of the housing (71) extends into the imported groove (12), and the outer wall of the rear end of the housing (71) is sealed and fitted with the inner wall of the imported groove (12).

7. The welded solenoid valve testing and assembly fixture according to claim 6, characterized in that, The rear end of the imported clamp (1) is provided with a connecting hole (13), the detection inlet (11) is connected to the connecting hole (13), the connecting hole (13) is provided with an internal thread, and the front end of the imported adapter (5) extends into the connecting hole (13) and is provided with an external thread.

8. The welded solenoid valve testing and assembly fixture according to claim 7, characterized in that, The bottom surface of the inlet groove (12) is provided with a first sealing ring (14) surrounding the detection inlet (11), the rear end face of the positioning boss (23) is provided with a second sealing ring (26) surrounding the detection outlet (21), and the inner wall of the outlet groove (24) is provided with a third sealing ring (27).

9. The welded solenoid valve testing assembly tooling according to any one of claims 1 to 8, characterized in that, Both the detection inlet (11) and the outlet adapter (6) are equipped with filter screen assemblies (8), and the filter screen assemblies (8) are pressed together by soft rubber pads (9) installed in the knife relief groove.

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