Solenoid valve test method and detection tool

Abstract

The invention belongs to the technical field of valves, and particularly discloses a test method and a detection tool of an electromagnetic valve. The testing method comprises the following steps: assembling the two-way valve module; the two-way valve module is installed on the first test tool, so that the two-way valve module and the first test tool are matched to form a first airtight test cavity comprising a valve inner cavity, and the first airtight test cavity is separated from the two-way valve port through the two-way valve element; testing the air tightness of the first air tightness test cavity; the two-way valve module, the one-way valve module and the electromagnetic mechanism are assembled to form an electromagnetic valve; the electromagnetic valve is installed on a second testing tool, so that a second airtight testing cavity is defined by the valve port frame, the electromagnetic mechanism and the second testing tool; the second valve core is separated from the second valve port, so that the first valve port, the valve inner cavity, the second valve port and the external environment are communicated; and testing the air tightness of the second air tightness test cavity. According to the invention, the test efficiency and the test precision of the solenoid valve which comprises the valve port frame and has two seals can be improved, and the processing production efficiency of the solenoid valve is improved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a testing method and testing fixture for a solenoid valve. Background Technology

[0002] Solenoid valves are a common type of valve used to control the opening and closing of channels and the flow rate of fluids in pipelines. They are widely used in gas-fired water heating equipment and are an essential core component of such equipment.

[0003] To improve the reliability of gas path sealing, existing technology provides a solenoid valve, which includes a solenoid mechanism, a primary valve module, and a secondary valve module. The primary valve module includes a primary valve core and a primary elastic element; the secondary valve module includes a valve port holder, a secondary valve core, and two secondary elastic elements. The valve port holder is mounted at the end of the solenoid mechanism and has an inlet chamber, a primary valve port, a valve inner cavity, and a secondary valve port sequentially connected along the axial direction of the secondary valve cores. The first end of the primary valve core is slidably inserted into the central hole of the solenoid mechanism, and the second end is located within the inlet chamber; the second end of the primary valve core can open or block the primary valve port. The first end of the secondary valve core is slidably inserted into the primary valve core, and the second end extends through the primary valve port into the valve inner cavity; the secondary valve core can open or block the secondary valve port. The primary elastic element acts on the primary valve core to apply an elastic force to the primary valve core, causing the primary valve core to block the primary valve port; the secondary elastic element is installed within the valve inner cavity and applies an elastic force to the secondary valve core, causing the secondary valve core to block the secondary valve port.

[0004] To ensure the reliability of solenoid valves in actual use, airtightness testing is required before production, and the airtightness of each valve core needs to be tested. However, there is currently a lack of specialized testing methods and equipment for this type of solenoid valve, which is not conducive to the large-scale testing and production of this type of solenoid valve. Summary of the Invention

[0005] One of the technical problems solved by this invention is to provide a testing method for solenoid valves, which can test solenoid valves with valve holders and double seals, thereby improving the testing accuracy of solenoid valves.

[0006] The second technical problem solved by this invention is to provide a testing fixture that can test a solenoid valve with a valve holder and a double seal, thereby improving the testing accuracy of the solenoid valve.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A test method for a solenoid valve, the test method comprising:

[0009] S1. Assemble the two-stage valve module;

[0010] S2. Install the two-valve module on the first test fixture so that the two-valve module and the first test fixture cooperate to form a first airtight test chamber including the valve cavity. The first airtight test chamber is separated from the two valve cores and the two valve ports.

[0011] S3. Test the airtightness of the first airtightness test chamber;

[0012] S4. After the airtightness of the first airtightness test chamber meets the requirements, assemble the second valve module, the first valve module and the electromagnetic mechanism to form an electromagnetic valve.

[0013] S5. Install the solenoid valve on the second test fixture so that the valve holder, the solenoid mechanism and the second test fixture surround to form a second airtight test chamber, the second airtight test chamber being separated from a valve core and a valve port by a valve core.

[0014] S6. Separate the second valve core from the second valve port so that the first valve port, the valve cavity, the second valve port and the external environment are connected in sequence.

[0015] S7. Test the airtightness of the second airtightness test chamber.

[0016] The testing method for the solenoid valve described in this invention has the following advantages compared with the prior art: When testing the solenoid valve, the two-stage valve module can be assembled separately first, and the airtightness of the two-stage valve module can be tested separately using a first testing fixture after assembly. This allows the two-stage valve module to be modified and repaired separately if it fails the test, reducing testing costs. After the two-stage valve module passes the test, the two-stage valve module, the first-stage valve module, and the solenoid mechanism are assembled to form a solenoid valve. The airtightness of the first-stage valve module sealing the first valve port is then tested, realizing the sealing performance test of the solenoid valve with two seals. In particular, when testing the first valve port, the second valve port is in the open state, which can effectively avoid the influence of the second valve core and ensure the accuracy of the test.

[0017] In one embodiment, the valve holder includes a first frame and a second frame that are detachably connected. The first frame has an air inlet chamber, the first valve port, and a mounting cavity with one open end. The second frame has the second valve port.

[0018] Assembling the two-channel valve module includes:

[0019] The two sealing caps are coaxially connected to one end of the two valve shafts to form a two valve core.

[0020] Two elastic elements are inserted into the mounting cavity through the opening of the mounting cavity;

[0021] The two valve cores are inserted into the mounting cavity through the opening of the mounting cavity until the two valve shafts pass through the first valve port and the two sealing caps are located in the mounting cavity;

[0022] The second frame is installed on the first frame so that the second frame blocks the opening of the mounting cavity and forms the valve cavity with the first frame. The two sealing caps block the two valve ports under the action of the two elastic elements.

[0023] In one embodiment, the first test fixture includes a first detection seat and a sealing member. The first detection seat has a first positioning groove, with a first end of the first positioning groove open and a second end having a vent hole. The sealing member has a positioning slot.

[0024] In step S2, installing the two-channel valve module onto the first test fixture specifically includes:

[0025] Insert the valve port bracket of the two-way valve module into the first positioning groove until the valve port bracket abuts against the bottom of the first positioning groove;

[0026] The two valve cores are inserted into the positioning slot and the sealing member is pushed close to the first detection seat until the sealing member blocks the opening of the first positioning slot. The two valve cores are spaced apart from the bottom of the positioning slot.

[0027] In one embodiment, the first detection seat is provided with a first air supply channel communicating with the first positioning groove, and step S3 specifically includes:

[0028] Gas is introduced into the first airtightness test chamber through the first gas supply channel so that the first airtightness test chamber reaches a preset pressure.

[0029] Detect whether there is a gas leak in the first airtightness test chamber.

[0030] In one embodiment, the second test fixture includes a second detection seat and a pressing member. The second detection seat has a second positioning groove with one end open, and a bottom through hole is provided at the bottom of the second positioning groove.

[0031] In step S5, installing the solenoid valve onto the second test fixture specifically includes:

[0032] Insert the valve holder into the second positioning groove until the side of the valve holder away from the electromagnetic mechanism abuts against the bottom of the second positioning groove and the electromagnetic mechanism blocks the opening of the second positioning groove;

[0033] The pressing member is controlled to move in the direction toward the second detection seat until the pressing member presses against the side of the electromagnetic mechanism away from the valve holder.

[0034] In one embodiment, the second test fixture includes a pushing member and a pushing drive member. In step S6, separating the second valve core from the second valve port specifically includes:

[0035] Control the action of the push drive to drive the push member to move in the direction toward the second detection seat until the push member passes through the bottom through hole and the second valve port, and pushes the second valve core away from the second valve port.

[0036] The second technical problem mentioned above is solved by the following technical solution:

[0037] A testing fixture, applied to the above testing method, the testing fixture comprising:

[0038] The first test fixture includes a first detection seat and a sealing component. The first detection seat has a first positioning groove, one end of which is open and a vent hole is provided at the bottom. The side wall of the first positioning groove has a first air supply channel that connects to the first positioning groove. The sealing component has a positioning slot, which is used to cooperate with the second valve core. The sealing component can block the opening of the first positioning groove.

[0039] The second test fixture includes a second detection seat, a pressing mechanism, and a pushing mechanism. The second detection seat has a second positioning groove, one end of which is open and a bottom through hole is provided at the bottom. The side wall of the second positioning groove has a second air supply channel that connects to the second positioning groove. The pressing mechanism is opposite to and spaced apart from the opening of the second positioning groove to press against the electromagnetic mechanism. The pushing mechanism is directly opposite to the bottom through hole to push the two valve cores away from the two valve ports.

[0040] Compared with the prior art, the testing fixture described in this invention has the following advantages: By setting a first testing fixture and a second testing fixture, the airtightness of a single two-way valve module can be tested using the first testing fixture, and the assembled solenoid valve can be tested using the second testing fixture, thereby improving the testing efficiency and accuracy of the solenoid valve; simultaneously, by setting a first testing seat with a first positioning groove on the first testing fixture and a second testing seat with a second positioning groove on the second testing fixture, it is beneficial to form a first airtightness testing chamber and a second airtightness testing chamber; by setting a sealing component with a positioning slot on the first testing fixture, the cooperation between the positioning slot and the two-way valve core can ensure that the two-way valve core remains stable during the testing process, effectively avoiding the influence of airflow on the two-way valve core and ensuring the reliability of the testing of the two-way valve module; when testing the first valve port, the pushing mechanism keeps the second valve port in an open state, which can effectively avoid the influence of the second valve core and ensure the accuracy of the testing.

[0041] In one embodiment, the first positioning groove is a frustoconical groove, the inner diameter of the first positioning groove gradually increases along the direction toward the opening of the first positioning groove, and the minimum inner diameter of the first positioning groove is greater than or equal to the maximum outer diameter of the valve port bracket.

[0042] And / or, the second positioning groove is a frustoconical groove, the inner diameter of the second positioning groove gradually increases along the direction toward the opening of the second positioning groove, and the minimum inner diameter of the second positioning groove is greater than or equal to the maximum outer diameter of the valve port bracket.

[0043] In one embodiment, the sealing member includes a sealing main part, and a boss is provided on one end of the sealing main part facing the first detection seat. The sealing main part can abut against the end face of the first detection seat to seal the opening of the first positioning groove. The boss can be inserted into the first positioning groove and is spaced apart from the groove wall of the first positioning groove.

[0044] In one embodiment, the pushing mechanism includes a pushing member and a pushing drive member, the pushing drive member being connected to the pushing member, the pushing drive member driving the pushing member to move in a direction toward or away from the second detection seat, the pushing member being able to pass through the bottom through hole and the second valve port;

[0045] And / or, the second test fixture further includes a positioning seat, which is located between the second detection seat and the pressing mechanism. The upper end of the positioning seat is provided with a positioning groove, which is used to insert and cooperate with the electromagnetic mechanism. Attached Figure Description

[0046] Figure 1 This is a cross-sectional view of the structure of a solenoid valve in related technologies;

[0047] Figure 2 This is a cross-sectional view of a two-valve module in related technologies;

[0048] Figure 3 A flowchart of the testing method provided in the embodiments of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of the two-channel valve module and the first test fixture provided in an embodiment of the present invention;

[0050] Figure 5 A cross-sectional view of the two-valve module and the first test fixture provided in an embodiment of the present invention;

[0051] Figure 6 for Figure 5 A magnified view of a section at point I;

[0052] Figure 7 This is a schematic diagram of the structure of the solenoid valve and the second test fixture provided in an embodiment of the present invention;

[0053] Figure 8 A cross-sectional view of the solenoid valve and the second test fixture provided in an embodiment of the present invention;

[0054] Figure 9 for Figure 8 A magnified view of a section at point J.

[0055] Label Explanation:

[0056] 1. Solenoid valve; 11. Solenoid mechanism; 111. Convex ring; 112. Magnetic guide frame; 113. Plastic-encapsulated housing; 12. First valve module; 121. First valve core; 1211. First valve shaft; 1212. First sealing cap; 1213. Sleeve; 1214. Spring seat; 122. First elastic element; 13. Second valve module; 131. Valve port holder; 1311. First frame; 13 12. Second frame; 1313. Air inlet chamber; 1314. First valve port; 1315. Valve inner cavity; 1316. Second valve port; 1317. Air inlet; 132. Second valve core; 1321. Second valve shaft; 1322. Second sealing cap; 133. Second elastic element; 14. Mounting base; 141. Base plate; 142. Inner ring; 143. Outer ring; 144. Fixing plate;

[0057] 2. First test fixture; 21. First test seat; 211. First positioning groove; 212. Vent hole; 22. Sealing component; 221. Sealing main part; 222. Boss part; 223. Positioning slot; 224. Guide groove; 23. Sealing drive component; 24. First base; 241. Bottom of the base; 242. Fixed base part; 25. First sealing component; 26. Second sealing component; 27. First air inlet connector;

[0058] 3. Second test fixture; 31. Second test seat; 311. Second positioning groove; 322. Bottom through hole; 32. Pushing mechanism; 321. Pushing component; 3211. Connecting part; 3212. Pushing protrusion; 322. Pushing drive component; 33. Pressing mechanism; 331. Pressing component; 332. Pressing drive component; 34. Positioning seat; 341. Positioning groove; 35. Second base; 351. Base part; 352. First side part; 353. Second side part; 36. Third sealing component; 37. Fourth sealing component; 38. Second air inlet connector. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0061] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] like Figure 1 and Figure 2As shown, in the related technology, the solenoid valve 1 includes a solenoid mechanism 11, a primary valve module 12, and a secondary valve module 13. The primary valve module 12 includes a primary valve core 121 and a primary elastic element 122. The secondary valve module 13 includes a valve port holder 131, a secondary valve core 132, and a secondary elastic element 133. The valve port holder 131 is mounted on one end of the solenoid mechanism 11 and has an intake chamber 1313, a primary valve port 1314, a valve inner cavity 1315, and a secondary valve port 1316 sequentially connected along the axial direction of the secondary valve core 132. The first end of the primary valve core 121 can be axially movably inserted into the solenoid mechanism 11, and the second end extends into the intake chamber 1313. The second end of the primary valve core 121 can... The valve core 1314 can be opened or closed; an elastic element 122 is disposed in the intake chamber 1313 and is used to apply an elastic force to the valve core 121 to block the valve core 1314; the first end of the second valve core 132 can be slidably inserted into the valve core 121 along the axial direction, and the second end of the second valve core 132 is located in the valve cavity 1315 and can open or close the second valve core 1316; the second elastic element 133 is installed in the valve cavity 1315 and is used to apply an elastic force to the second valve core 132 to block the second valve core 1316.

[0064] When solenoid valve 1 is de-energized, valve core 121 blocks valve port 1314 under the action of elastic element 122, and valve core 132 blocks valve port 1316 under the action of elastic element 133. When solenoid valve 1 is energized, valve core 132 and valve core 121 both move in the direction toward solenoid mechanism 11. Valve core 121 opens valve port 1314, and valve core 132 opens valve port 1316. External airflow flows through inlet 1317, inlet chamber 1313, valve port 1314, valve cavity 1315 and valve port 1316 in sequence before flowing out. Solenoid valve 1 is in the open state.

[0065] In the aforementioned solenoid valve 1, the airtightness of the first valve core 121 sealing the first valve port 1314 and the airtightness of the second valve core 132 sealing the second valve port 1316 both affect the normal use of the solenoid valve 1. Before the solenoid valve 1 is manufactured, it is necessary to test the airtightness of the first valve core 121 sealing the first valve port 1314 and the airtightness of the second valve core 132 sealing the second valve port 1316.

[0066] like Figures 3 to 8 As shown, this embodiment provides a test method for the above-mentioned solenoid valve 1 and a test fixture for the test method, which can test the sealing tightness of the first valve core 121 to the first valve port 1314 and the sealing tightness of the second valve core 132 to the second valve port 1316.

[0067] The testing method provided in this embodiment includes the following steps:

[0068] Step S1: Assemble the two-way valve module 13;

[0069] Step S2: Install the two-way valve module 13 on the first test fixture 2 so that the two-way valve module 13 and the first test fixture 2 cooperate to form a first airtight test chamber including the valve inner cavity 1315. The first airtight test chamber is separated from the two-way valve port 1316 by the two-way valve core 132.

[0070] Step S3: Test the airtightness of the first airtightness test chamber;

[0071] Step S4: After the airtightness of the first airtightness test chamber meets the requirements, assemble the second valve module 13, the first valve module 12 and the electromagnetic mechanism 11 to form the electromagnetic valve 1.

[0072] Step S5: Install the solenoid valve 1 on the second test fixture 3 so that the valve holder 131, the solenoid mechanism 11 and the second test fixture 3 surround and form a second airtight test chamber. The second airtight test chamber is separated from the valve port 1314 by a valve core 121.

[0073] Step S6: Separate the second valve core 132 from the second valve port 1316 so that the first valve port 1314, the valve cavity 1315, the second valve port 1316 and the external environment are connected in sequence.

[0074] Step S7: Test the airtightness of the second airtightness test chamber.

[0075] The testing method for the solenoid valve 1 provided in this embodiment allows for the separate assembly of the two-way valve module 13. After assembly, the airtightness of the two-way valve module 13 is tested separately using the first testing fixture 2. This allows the two-way valve module 13 to be modified and repaired separately if it fails the test, without affecting the first-way valve module 12 and the solenoid mechanism 11, thus reducing testing costs. After the two-way valve module 13 passes the test, the two-way valve module 13, the first-way valve module 12, and the solenoid mechanism 11 are assembled to form the solenoid valve 1. The airtightness of the sealing of the first-way valve module 12 to the first valve port 1314 is then tested, achieving the sealing performance test of the solenoid valve 1 with two seals. When testing the first valve port 1314, the second valve port 1316 is kept open, which effectively avoids the influence of the second valve core 132 and ensures the accuracy of the test.

[0076] like Figure 2As shown, optionally, the valve holder 131 includes a first frame 1311 and a second frame 1312. The first frame 1311 has an air inlet chamber 1313 and a valve port 1314. The side of the first frame 1311 away from the air inlet chamber 1313 has an open mounting cavity. The second frame 1312 is detachably connected to the first frame 1311 so that the second frame 1312 blocks the openness of the mounting cavity and forms a valve inner cavity 1315 with the first frame 1311. Two valve ports 1316 are provided on the second frame 1312. The two valve cores 132 include two valve shafts 1321 and two sealing caps 1322 connected to one end of the two valve shafts 1321. The two valve shafts 1321 are slidably inserted into the valve port 1314, and the two sealing caps 1322 can open or close the two valve cores 132. The structure of this valve holder 131 can improve the ease of disassembly and assembly of the two-way valve module 13.

[0077] That is, in step S1, assembling the two-way valve module 13 includes the following steps:

[0078] S11. Connect the second sealing cap 1322 coaxially to one end of the second valve shaft 1321 to form the second valve core 132.

[0079] S12. Insert the two elastic elements 133 into the mounting cavity through the opening of the mounting cavity;

[0080] S13. Insert the second valve core 132 into the mounting cavity through the opening of the mounting cavity until the second valve shaft 1321 passes through the first valve port 1314 and the second sealing cap 1322 is located in the mounting cavity.

[0081] S14. The second frame 1312 is installed on the first frame 1311 so that the second frame 1312 seals the opening of the installation cavity and forms a valve inner cavity 1315 with the first frame 1311. The two sealing caps 1322 seal the two valve ports 1316 under the action of the two elastic elements 133.

[0082] The assembly method of this two-stage valve module 13 is simple and efficient. By removing the second frame 1312 from the first frame 1311, the assembly of the two-stage valve core 132 and the two-stage elastic element 133 can be achieved. At the same time, this arrangement allows the diameter of the two-stage sealing cap 1322 to be larger than the diameter of the first-stage valve port 1314, thereby improving the sealing effect of the two-stage sealing cap 1322 on the two-stage valve port 1316, and also avoiding the increase in the size of the first-stage valve module 12 due to the larger size of the first-stage valve port 1314.

[0083] Optionally, the valve holder 131 can be a non-detachable integrated structure. Assembling the two-way valve module 13 may include: inserting the two-way valve core 132 through a valve port 1314 into the valve holder 131; and fitting the two elastic elements 133 onto the two-way valve core 132.

[0084] Optionally, the outer wall of the second frame 1312 is provided with external threads, and the cavity wall of the mounting cavity is provided with internal threads. The second frame 1312 is screwed into the mounting cavity through the mating threads of the internal and external threads. In another embodiment, the second frame 1312 is a cylindrical structure with its opening facing the first frame 1311, and the second frame 1312 is sleeved on the outside of the open end of the mounting cavity. The bottom of the cylinder of the second frame 1312 has two valve ports 1316. In another embodiment, the second frame 1312 can also be connected to the first frame 1311 by interference fit, snap-fit, or other means, as long as the assembly of the first frame 1311 and the second frame 1312 forms a valve cavity 1315 that communicates only with one valve port 1314 and two valve ports 1316.

[0085] like Figure 5 and Figure 6 As shown, the first test fixture 2 includes a first detection seat 21 and a sealing component 22. The first detection seat 21 has a first positioning groove 211, one end of which is open and a vent hole 212 is provided at the bottom. A first air supply channel communicating with the first positioning groove 211 is provided on the side wall of the first positioning groove 211. The first positioning groove 211 is used to insert the two-way valve module 13. The sealing component 22 has a positioning slot 223, which is used to insert and cooperate with the two-way valve core 132 of the two-way valve module 13.

[0086] In step S2, installing the two-way valve module 13 onto the first test fixture 2 specifically includes:

[0087] S21. Insert the valve port bracket 131 of the second valve module 13 into the first positioning groove 211 until the valve port bracket 131 abuts against the bottom of the first positioning groove 211.

[0088] S22. Insert the second valve core 132 into the positioning slot 223 and push the sealing member 22 close to the first detection seat 21 until the sealing member 22 blocks the opening of the first positioning groove 211. The second valve core 132 and the bottom of the positioning slot 223 are spaced apart.

[0089] By setting a first test seat 21 with a first positioning groove 211 on the first test fixture 2, the valve port frame 131 can be installed and positioned by cooperating with the first positioning groove 211, improving assembly efficiency and facilitating the formation of the first airtight test chamber. By setting a sealing member 22 with a positioning slot 223, the second valve core 132 can be kept stable during the test by cooperating with the positioning slot 223, effectively avoiding the shaking of the second valve core 132 under the action of airflow and the influence of its own weight, thus ensuring the reliability of the test of the second valve module 13. That is, the structure of the first test fixture 2 and the installation method of the second valve module 13 on it can effectively improve the installation efficiency and reliability of the second valve module 13 on the first test fixture 2, thereby improving the test efficiency and facilitating the formation of the first airtight test chamber.

[0090] To improve the assembly efficiency of the two-stage valve module 13 and the first test fixture 2, in one embodiment, the first positioning groove 211 is a frustoconical groove, and the inner diameter of the first positioning groove 211 gradually increases along the direction towards the opening of the first positioning groove 211. The minimum inner diameter of the frustoconical groove is greater than or equal to the outer diameter of the valve holder 131, which facilitates guiding the valve holder 131 into the first positioning groove 211; at the same time, the setting of the frustoconical groove also facilitates the insertion of the valve holder 131 into the first positioning groove 211, effectively improving the assembly efficiency. Furthermore, the chamfer angle of the frustoconical groove is less than 5°.

[0091] In other embodiments, the first positioning groove 211 may also be a cylindrical groove, with a chamfered edge at the opening of the first positioning groove 211 to guide the valve holder 131 into the first positioning groove 211.

[0092] In one embodiment, the first test fixture 3 further includes a first sealing element 25. The first sealing element 25 is installed at the bottom of the first positioning groove 211 and surrounds the vent hole 212, so that when the valve holder 131 is inserted into the first positioning groove 211, the first sealing element 25 is pressed between the valve holder 131 and the bottom of the first positioning groove 211, and the first sealing element 25 surrounds the two valve ports 1316. By setting the first sealing element 25, the sealing between the bottom of the valve holder 131 and the bottom of the first positioning groove 211 can be guaranteed, effectively preventing the airflow in the first airtightness test chamber from flowing to the vent hole 212 through the gap between the outer wall of the valve holder 131 and the groove wall of the first positioning groove 211, thus ensuring the reliability of the airtightness test of the first airtightness test chamber.

[0093] In other embodiments, a sealing ring groove is provided on the groove wall of the first positioning groove 211, and the first sealing member 25 can be installed in the mounting ring groove, so that when the valve port bracket 131 is inserted into the first positioning groove 211, the first sealing member 25 is sandwiched between the circumferential side wall of the valve port bracket 131 and the bottom of the mounting ring groove.

[0094] In one embodiment, the first test fixture 2 further includes a second sealing element 26. When the sealing element 22 seals the mounting groove opening, the second sealing element 26 is sandwiched between the end faces of the sealing element 22 and the first detection seat 21, and the second sealing element 26 is arranged around the opening of the first positioning groove 211. Thus, the gap between the first detection seat 21 and the sealing element 22 can be sealed by the second sealing element 26, thereby effectively preventing the gas in the first airtight test chamber from flowing out through the gap between the sealing element 22 and the first detection seat 21, and improving the reliability of the airtight test chamber. At the same time, this arrangement can reduce the material selection requirements for the sealing element 22.

[0095] The first test fixture 2 includes a leak detector, which has an air supply pipe that is sealed and connected to the first air supply channel. The leak detector detects the leakage status of the inflated airtight test chamber, thereby determining the sealing status of the second valve core 132 on the second valve port 1316. In other embodiments, other existing equipment for detecting airtightness can also be used to test the airtightness of the airtight test chamber.

[0096] Step S3 specifically includes:

[0097] Gas is introduced into the first airtightness test chamber through the first gas supply channel so that the first airtightness test chamber reaches a preset pressure.

[0098] Check for gas leaks in the first airtightness test chamber.

[0099] It is worth noting that the structure of the leak detector and the principle of airtightness detection are both existing mature technologies, and will not be elaborated on in this embodiment.

[0100] To improve the ease of connection between the leak detector and the first air supply channel, in one embodiment, the first detection seat 21 includes a main seat portion, on which a first positioning groove 211 and a vent hole 212 are provided. A connecting pipe portion protrudes from the side of the main seat portion, and the first air supply channel passes through the connecting pipe portion along its axial direction and extends to the main seat portion. By providing the connecting pipe portion, it is convenient to connect the first detection seat 21 with the air supply pipe of the leak detector, thereby improving the assembly convenience of the first testing fixture 2.

[0101] In one embodiment, the first test fixture 2 further includes a first air inlet connector 27, which is detachably connected to the connecting pipe and detachably connected to the air supply pipe. By providing the first air inlet connector 27, the ease of connection between the air supply pipe and the connecting pipe can be improved. Furthermore, by selecting the appropriate model of the first air inlet connector 27, it is possible to better adapt to the model of the leak detector, thereby increasing the versatility of the components within the first air inlet connector 27 and reducing the cost of the first test fixture 2.

[0102] In other embodiments, the sealing member 22 can be an elastic structure. When the sealing member 22 contacts the first detection seat 21, the elastic deformation of the sealing member 22 itself achieves the sealing of the opening of the first positioning groove 211. In another embodiment, the sealing member 22 may also include a main body and an elastic part covering the end face of the main body. The abutment between the elastic part and the first detection seat 21 achieves the sealing of the opening of the first positioning groove 211.

[0103] To improve the ease of installation of the second seal 26, a sealing groove is formed on one side of the first detection seat 21 where the first positioning groove 211 is located. The sealing groove surrounds the opening of the first positioning groove 211, and the second seal 26 is installed in the sealing groove and extends out of the sealing groove. When the sealing member 22 approaches the first detection seat 21, the second seal 26 is pressed into the sealing groove by the sealing member 22, thus achieving a seal. In other embodiments, the sealing groove for installing the second seal 26 may also be formed on the end face of the first detection seat 21.

[0104] In one embodiment, the sealing member 22 includes a sealing main portion 221. A boss portion 222 protrudes from the side of the sealing main portion 221 facing the first detection seat 21. The sealing main portion 221 can abut against the end face of the first detection seat 21 to seal the opening of the first positioning groove 211. The outer diameter of the boss portion 222 is smaller than the inner diameter of the first positioning groove 211, and a positioning slot 223 extends from the end face of the boss portion 222 into the sealing main portion 221. When the sealing main portion 221 contacts the first detection seat 21, the boss portion 222 is inserted into the air intake chamber 1313. This arrangement increases the mating length between the second valve core 132 and the sealing member 22, thereby better maintaining a stable state of the second valve module 13 during testing. Simultaneously, this arrangement allows the boss portion 222 to fill part of the space in the air intake chamber 1313, thereby reducing the volume of the airtightness test chamber, thus reducing the amount of air required for testing and lowering testing costs.

[0105] In one embodiment, when the sealing member 22 blocks the opening of the first positioning groove 211, the groove wall of the positioning slot 223 is spaced apart from the second valve core 132 to avoid the first detection seat 21 applying force to the second valve core 132.

[0106] To improve the smoothness of the insertion of the second valve core 132 into the positioning slot 223, the opening of the positioning slot 223 is widened to form a tapered guide groove 224. The inner diameter of the guide groove 224 gradually increases in the direction away from the positioning slot 223 to guide the second valve core 132 into the positioning slot 223, thereby improving the ease of assembly of the first test fixture 2 and the second valve module 13, improving assembly efficiency, and thus improving the testing efficiency of the second valve module 13.

[0107] To improve testing efficiency, in one embodiment, the first testing fixture 2 further includes a blocking drive component 23, which is connected to the blocking component 22. The blocking drive component 23 drives the blocking component 22 to move closer to the first testing seat 21 to block the opening of the first positioning groove 211, or drives the blocking component 22 away from the first testing seat 21 to open the opening of the first positioning groove 211. By setting the blocking drive component 23, the blocking component 22 can be driven closer to or away from the first testing seat 21, thereby realizing the automatic blocking or opening of the opening of the first positioning groove 211, improving the automation of testing, and thus improving the testing effect. In other embodiments, the blocking component 22 can also be manually operated to block and open the opening of the first positioning groove 211.

[0108] In one embodiment, the first test fixture 2 further includes a first base 24, on which the first detection seat 21 and the driving component are both mounted, thereby facilitating the handling of the first test fixture 2 and improving its ease of use. The first base 24 includes a base bottom 241 and a fixed seat portion 242 connected to the base bottom 241. The first detection seat 21 is mounted on the base bottom 241 and spaced apart from the fixed seat portion 242, and the blocking driving component 23 is mounted on the fixed seat portion 242.

[0109] In one embodiment, the blocking drive 23 is preferably a drive piston cylinder. The cylinder body of the drive piston cylinder is mounted on the side of the fixed seat 242 away from the first detection seat 21, and the telescopic rod of the drive piston cylinder passes through the fixed seat 242 and is connected to the blocking member 22. However, it is understood that the blocking drive 23 can also adopt other structures that can realize the reciprocating movement of the blocking member 22, such as a drive motor combined with a gear and rack structure.

[0110] The sealing component 22 has a mounting groove on the side away from the first detection seat 21. The telescopic rod of the driving piston cylinder is inserted into the mounting groove to connect the sealing component 22 with the sealing drive component 23. The telescopic rod and the sealing component 22 can be connected by threads, interference fit, or other structures, as long as the reliability of the connection between the sealing component 22 and the telescopic rod is guaranteed.

[0111] Optional, such as Figure 1 As shown, a valve core 121 includes a valve shaft 1211, a sleeve 1213, and a sealing cap 1212. One end of the valve shaft 1211 is slidably inserted into the electromagnetic mechanism 11. One end of the sleeve 1213 is coaxially sleeved on the outside of the valve shaft 1211. The other end of the sleeve 1213 is coaxially connected to two sealing caps 1322. One sealing cap 1212 is inserted into the intake chamber 1313 and can selectively open or block a valve port 1314. One end of an elastic element 122 abuts against the side of the intake chamber 1313 away from the valve port 1314, and the other ends of the two elastic elements 133 abut against the sealing cap 1212.

[0112] The solenoid valve 1 also includes a mounting base 14, which is installed in the opening of the air intake chamber 1313 and connected to the solenoid mechanism 11. Specifically, the magnetic plate of the solenoid mechanism 11 has a protruding ring portion 111, which surrounds a valve core 121, and the mounting base 14 is coaxially sleeved on the outside of the protruding ring portion 111.

[0113] In step S4, assembling the two-stage valve module 13, the one-stage valve module 12, and the electromagnetic mechanism 11 to form the solenoid valve 1 specifically includes:

[0114] Step S41: Assemble a valve shaft 1211, a sleeve 1213 and a sealing cap 1212 to form a valve core 121;

[0115] Step S42: Fit an elastic element 122 onto a valve shaft 1211 and press it against a sealing cap 1212;

[0116] Step S43: Coaxially sleeve one valve core 121 on the outside of the second valve core 132, and make the sealing cap 1212 abut against the end face of the valve port 1314.

[0117] Step S44: Fit the mounting base 14 onto the protruding ring 111 and abut against the magnetic plate of the electromagnetic mechanism 11.

[0118] Step S45: Insert a valve shaft 1211 into the center hole of the electromagnetic mechanism 11, and connect the valve holder 131 and the mounting base 14.

[0119] The assembly of the solenoid valve 1 described above allows the solenoid mechanism 11, the first valve module 12, and the second valve module 13 to be assembled separately before being assembled together, which can effectively improve assembly efficiency and enhance the disassembly and assembly performance of the internal components of the solenoid valve 1.

[0120] In one embodiment, a valve core 121 further includes a spring seat 1214, which is sleeved on the outside of a sealing cap 1212, and an elastic member 122 abuts against the spring seat 1214. That is, in step S41, a spring seat 1214 is sleeved on the outside of a sealing cap 1212 to assemble a valve core 121.

[0121] In one embodiment, the mounting base 14 includes an annular base plate portion 141, which abuts against a magnetic plate. An inner ring portion 142 is folded and connected to the inner edge of the base plate portion 141, and the inner ring portion 142 is fitted onto a protruding ring portion 111. An outer ring portion 143 is connected to the outer edge of the base plate portion 141. A fixing plate portion 144 extends partially from the outer ring portion 143 in a direction away from the base plate portion 141. Multiple fixing plate portions 144 are spaced apart along the circumference of the mounting base 14. An air inlet 1317 communicating with an air inlet chamber 1313 is opened on the side wall of the valve port bracket 131. Multiple air inlets 1317 are spaced apart along the circumference of the valve port bracket 131.

[0122] In step S45, connecting the valve port bracket 131 and the mounting base 14 specifically includes:

[0123] Step S451: Insert the valve port bracket 131 into the mounting base 14 until the end of the valve port bracket 131 abuts against the base plate 141, and the air inlet 1317 and the fixing plate 144 are set one-to-one.

[0124] Step S452: Fold the fixing plate 144 in the direction toward the inside of the valve holder 131 so that the fixing plate 144 abuts against the side edge of the air inlet 1317 toward the electromagnetic mechanism 11.

[0125] In one embodiment, the fixing plate portion 144 is folded again in the direction toward the electromagnetic mechanism 11 so that the end of the fixing plate portion 144 away from the outer ring portion 143 is in contact with the inner side wall of the valve port bracket 131, thereby improving the fixing effect between the mounting base 14 and the valve port bracket 131.

[0126] In one embodiment, the second testing fixture 3 includes a second testing seat 31 and a pressing mechanism 33. The second testing seat 31 has a second positioning groove 311 with one open end. A bottom through hole 322 is formed at the bottom of the second positioning groove 311. A second air supply channel communicating with the second positioning groove 311 is formed on the side wall of the second positioning groove 311. The second positioning groove 311 is used to insert a valve port holder 131, and when the valve port holder 131 is inserted into the second positioning groove 311, the second air supply channel communicates with the air inlet chamber 1313, and the two valve ports 1316 communicate with the bottom through hole 322. The pressing mechanism 33 is disposed on one side of the second testing seat 31 and is opposite to and spaced apart from the opening of the second positioning groove 311. The pressing mechanism 33 includes a pressing member 331, which is used to press the electromagnetic mechanism 11 of the solenoid valve 1 against the second testing seat 31.

[0127] In step S5, installing the solenoid valve onto the second test fixture 3 specifically includes:

[0128] Insert the valve holder 131 into the second positioning groove 311 until the side of the valve holder 131 away from the electromagnetic mechanism 11 abuts against the bottom of the second positioning groove 311 and the electromagnetic mechanism 11 blocks the opening of the second positioning groove 311.

[0129] The pressure member 331 is controlled to move in the direction toward the second detection seat 31 until the pressure member 331 presses against the electromagnetic mechanism 11 away from the valve holder 131.

[0130] The second positioning groove 311 enables the valve holder 131 to be installed and positioned on the second test seat 31, and facilitates the formation of the second airtightness test chamber and the supply of air to the second airtightness test chamber through the air inlet channel, thereby improving the convenience of airtightness testing. By setting the pressing mechanism 33 to press the electromagnetic mechanism 11 against the second test seat 31, it can be ensured that the electromagnetic valve 1 remains relatively fixed to the second test seat 31 during the testing process. The electromagnetic mechanism 11 will not loosen relative to the second test seat 31, which would cause leakage at the connection position between the second test seat 31 and the electromagnetic mechanism 11, thus ensuring the reliability of airtightness testing of the second airtightness test chamber. At the same time, there is no need to use screws or other fastening structures to fasten the electromagnetic mechanism 11 on the second test seat 31, which effectively improves the ease of disassembly and assembly of the electromagnetic valve 1 on the second test fixture 3, thereby improving the testing efficiency.

[0131] To improve the assembly efficiency of the solenoid valve 1 and the second test fixture 3, in one embodiment, the second positioning groove 311 is a frustoconical groove, and the inner diameter of the second positioning groove 311 gradually increases along the direction towards the opening of the second positioning groove 311. The minimum inner diameter of the frustoconical groove is greater than or equal to the maximum outer diameter of the valve holder 131, thereby facilitating the installation of the valve holder 131 into the second positioning groove 311 and effectively improving assembly efficiency. Furthermore, the chamfer angle of the frustoconical groove is less than 5°. In other embodiments, the second positioning groove 311 can also be a cylindrical groove, with a chamfered edge at the opening of the second positioning groove 311 to guide the valve holder 131 into the second positioning groove 311.

[0132] In one embodiment, the second test fixture 3 further includes a third sealing element 36. The third sealing element 36 is installed at the bottom of the second positioning groove 311 and surrounds the bottom through hole 322, so that when the valve holder 131 is inserted into the second positioning groove 311, the third sealing element 36 is pressed between the valve holder 131 and the bottom of the second positioning groove 311, and the third sealing element 36 surrounds a valve port 1314. By providing the third sealing element 36, the sealing between the bottom of the valve holder 131 and the bottom of the second positioning groove 311 can be guaranteed, preventing the airflow in the second airtightness test chamber from flowing to the bottom through hole 322 through the gap between the outer wall of the valve holder 131 and the groove wall of the second positioning groove 311, thus ensuring the reliability of the airtightness test of the second airtightness test chamber.

[0133] In other embodiments, a sealing ring groove is provided on the groove wall of the second positioning groove 311, and the third sealing member 36 can be installed in the mounting ring groove, so that when the valve port bracket 131 is inserted into the second positioning groove 311, the third sealing member 36 is sandwiched between the circumferential side wall of the valve port bracket 131 and the bottom of the mounting ring groove.

[0134] In one embodiment, the second test fixture 3 further includes a fourth sealing element 37, which surrounds the opening of the second positioning groove 311. When the solenoid valve 1 is installed in place, the fourth sealing element 37 is pressed between the second detection seat 31 and the valve holder 131. By providing the fourth sealing element 37, the gap between the solenoid mechanism 11 and the second detection seat 31 can be sealed, thereby preventing air leakage at the connection position of the solenoid mechanism 11 and the second detection seat 31 and ensuring the reliability of the airtightness test of the second airtightness test chamber.

[0135] The end face of the second detection seat 31 is provided with a sealing groove, which surrounds the opening of the second positioning groove 311. The fourth sealing element 37 is installed in the sealing groove and is pressed between the electromagnetic mechanism 11 and the bottom of the sealing groove to improve the installation convenience of the fourth sealing element 37.

[0136] The pressing mechanism 33 also includes a pressing drive 332. The pressing member 331 is connected to the driving end of the pressing drive 332, and the pressing drive 332 drives the pressing member 331 to move closer to or away from the second detection seat 31, so as to achieve contact or separation between the pressing member 331 and the side of the electromagnetic mechanism 11 away from the second detection seat 31. Thus, the pressing member 331 can be automatically pressed by driving the pressing member 332, thereby improving efficiency. Specifically, the pressing member 331 contacts the magnetic guide frame 112 of the electromagnetic mechanism 11.

[0137] The side of the pressing member 331 facing the second detection seat 31 is a plane perpendicular to the first direction. This plane fits against the electromagnetic mechanism 11 to increase the contact area between the pressing member 331 and the electromagnetic mechanism 11, thereby improving the reliability of the pressing member 331 against the electromagnetic mechanism 11. The pressing member 331 is preferably a cylindrical structure coaxial with the second positioning groove 311, ensuring that the pressing member 331 and the electromagnetic mechanism 11 are coaxially arranged. This guarantees the stability and reliability of the pressing force exerted by the pressing member 331 on the electromagnetic mechanism 11, and consequently ensures the installation and detection accuracy of the solenoid valve 1.

[0138] In one embodiment, the pressing drive 332 is a piston cylinder, and the extension rod of the piston cylinder is connected to the pressing member 331 to drive the pressing member 331 to reciprocate along the first direction. In other embodiments, the pressing drive 332 may also adopt other existing driving structures that can realize the movement of the pressing member 331 along the first direction, and this embodiment does not impose specific limitations on this.

[0139] In one embodiment, the second testing fixture 3 further includes a pushing mechanism 32, which is disposed on the side of the second testing seat 31 away from the opening of the second positioning groove 311. The pushing mechanism 32 includes a pushing member 321 and a pushing drive member 322. The pushing mechanism 32 is disposed on the side of the second testing seat 31 away from the opening of the second positioning groove 311, and the pushing member 321 is disposed directly opposite the bottom through hole 322.

[0140] In step S6, separating the second valve core 132 from the second valve port 1316 specifically includes:

[0141] Control the action of the push drive 322 to drive the push member 321 to move in the direction toward the second detection seat 31 until the push member 321 passes through the bottom through hole 322 and the second valve port 1316, and pushes the second valve core 132 away from the second valve port 1316.

[0142] By setting the pusher 321 and the pusher drive 322, the pusher 321 can push the second valve core 132 to separate it from the second valve port 1316. This can effectively improve the convenience and stability of the second valve core 132 separating from the second valve port 1316, thereby making it easier to ensure the stable and reliable operation of the test, and also improving the automation of the test.

[0143] In other embodiments, the second valve core 132 can be opened by manually actuating the pusher 321, and the pusher 321 can be fastened to the position where the second valve core 132 is pushed open by a fastening structure. Optionally, a preset current can be supplied to the electromagnetic mechanism 11 by a DC power supply to separate the second valve core 132 from the second valve port 1316, while the first valve core 121 still blocks the first valve port 1314.

[0144] In one embodiment, the pushing member 321 includes a connecting portion 3211 and a pushing protrusion 3212. The pushing protrusion 3212 protrudes from the connecting portion 3211 on the side facing the second detection seat 31, and the cross-sectional area of ​​the pushing protrusion 3212 is smaller than that of the connecting portion 3211. The pushing protrusion 3212 can pass through the bottom through hole 322 and the second valve port 1316 in sequence to push the second valve core 132. This structural configuration of the pushing member 321 allows the size of the pushing protrusion 3212 to meet the requirements of passing through the second valve port 1316 and the bottom through hole 322, while increasing the overall size of the pushing member 321, thereby improving the overall structural strength of the pushing member 321, reducing the probability of deformation of the pushing member 321 during the pushing process, and improving the reliability of the pushing mechanism 32.

[0145] The pushing protrusion 3212 preferably adopts a cylindrical structure to simplify the structure of the pushing member 321 and to make the shape of the pushing protrusion 3212 compatible with the shape of the second valve port 1316 and the bottom through hole 322. The connecting part 3211 may adopt a cylindrical structure, a polygonal prism structure or other shapes, and the present invention is not limited thereto.

[0146] In one embodiment, a limiting surface is provided on the side of the second detection seat 31 away from the opening of the second positioning groove 311. The limiting surface can abut against the side of the connecting part 3211 facing the second detection seat 31. Thus, when the pushing member 321 moves in the direction towards the second detection seat 31, the abutment between the connecting part 3211 and the limiting surface can limit the depth of the pushing member 321 inserted into the second detection seat 31, thereby limiting the distance by which the pushing member 321 can push the second valve core 132 away from the second valve port 1316. This effectively avoids the second elastic member 133 being over-compressed and causing damage to the solenoid valve 1, and also effectively avoids the situation where the second valve core 132 is over-pushted, resulting in the first valve core 121 blocking the first valve port 1314.

[0147] In one embodiment, the second detection seat 31 has an outer groove on the side away from the opening of the second positioning groove 311. The outer groove surrounds the bottom through hole 322 and communicates with the bottom through hole 322, and the bottom of the outer groove forms a limiting surface. In other embodiments, the limiting surface may be partially formed on the end face of the second detection seat 31 away from the opening of the second positioning groove 311.

[0148] The pushing drive 322 preferably adopts a piston cylinder structure, with the end of the piston rod of the piston cylinder connected to the pushing member 321 to drive the pushing member 321 to reciprocate axially along the second positioning groove 311. Using a piston cylinder to drive the pushing member 321 ensures driving reliability and allows the pushing drive 322 and the second detection seat 31 to be spaced apart to avoid interference between the structures. It is understood that in other embodiments, the pushing drive 322 may also adopt other existing structures capable of achieving reciprocating linear motion of the pushing member 321; the present invention does not limit the specific structure of the pushing drive 322.

[0149] The second testing fixture 3 includes a leak detector, which has an air supply pipe that is sealed and connected to the second air supply channel. The leak detector detects the leakage status of the inflated second airtightness test chamber, thereby determining the sealing status of the valve core 121 to the valve port 1314. In other embodiments, other existing equipment for airtightness testing can also be used to test the airtightness of the second airtightness test chamber. It is worth noting that the structure of the leak detector and the principle of airtightness testing are existing mature technologies, and will not be elaborated upon in this embodiment.

[0150] To improve the ease of connection between the leak detector and the second air supply channel, in one embodiment, the second detection seat 31 includes a main seat portion, on which a second positioning groove 311 and a bottom through hole 322 are provided. A connecting pipe portion protrudes from the side of the main seat portion, and the second air supply channel passes through the connecting pipe portion along its axial direction and extends to the main seat portion. By providing the connecting pipe portion, it is convenient to connect the second detection seat 31 with the air supply pipe of the leak detector, thereby improving the assembly convenience of the second testing fixture 3.

[0151] In one embodiment, the second testing fixture 3 further includes a second air inlet connector 38, which is detachably connected to the connecting pipe and detachably connected to the air supply pipe. By providing the second air inlet connector 38, the ease of connection between the air supply pipe and the connecting pipe can be improved. Furthermore, by selecting the appropriate model of the second air inlet connector 38, it is possible to better adapt to the model of the leak detector, thereby improving the versatility of the components within the second testing fixture 3 and reducing the cost of the second testing fixture 3.

[0152] To improve the overall integrity of the second testing fixture 3, in one embodiment, the second testing fixture 3 includes a second base 35, a pressing mechanism 33, a second detection seat 31 and a pushing mechanism 32 arranged on the second base 35 along a first direction, so that the second testing fixture 3 forms a device that can be assembled and disassembled as a whole, thereby improving the ease of use and handling of the second testing fixture 3.

[0153] To improve the installation reliability of the solenoid valve 1, in one embodiment, the second test fixture 3 further includes a positioning seat 34. The positioning seat 34 is located between the second detection seat 31 and the pressing mechanism 33. The upper end of the positioning seat 34 has a positioning groove 341, which is used to insert and cooperate with the electromagnetic mechanism 11 of the solenoid valve 1. By setting the positioning seat 34, when the solenoid valve 1 is installed on the second test fixture 3, the end of the electromagnetic mechanism 11 away from the valve port bracket 131 is supported by the positioning seat 34, thereby ensuring the stability and reliability of the solenoid valve 1 on the second test fixture 3. This prevents the electromagnetic mechanism 11 from bending under gravity, which could cause the valve core 121 to shift position during the test, thus improving the installation reliability of the solenoid valve 1 on the second test fixture 3 and consequently improving the test reliability of the solenoid valve 1. Specifically, the positioning seat 34 is installed on the second base 35.

[0154] The second positioning groove 311 has an upward-opening U-shaped structure, forming a positioning groove 341. This simplifies the structure of the positioning seat 34. Furthermore, the positioning groove 341 limits the position of the electromagnetic mechanism 11 in the vertical direction and the horizontal direction perpendicular to the axial direction, preventing positional displacement of the electromagnetic mechanism 11 and further improving the installation reliability of the solenoid valve 1. Specifically, the positioning groove 341 mates with the plastic-encapsulated housing 113 of the electromagnetic mechanism 11.

[0155] The second base 35 includes a base portion 351 and a first side portion 352 and a second side portion 353 respectively disposed on opposite sides of the base portion 351. A pushing drive member 322 is mounted on the first side portion 352 and a pressing drive member 332 is mounted on the second side portion 353. A second detection seat 31 and a positioning seat 34 are mounted on the base portion 351 to improve the ease of installation of the pushing mechanism 32 and the pressing mechanism 33. Furthermore, the pressing drive member 332 is mounted on the side of the second side portion 353 away from the second detection seat 31, and the pushing drive member 322 is mounted on the side of the first side portion 352 away from the second detection seat 31, to avoid structural interference while reducing the size of the second base 35 in the first direction.

[0156] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0157] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A test method for a solenoid valve, characterized in that, The testing method includes: S1. Assemble the two-way valve module (13). S2. Install the two-way valve module (13) on the first test fixture (2) so that the two-way valve module (13) and the first test fixture (2) cooperate to form a first airtight test chamber including the valve inner cavity (1315), and the first airtight test chamber is separated from the two-way valve core (132) and the two-way valve port (1316). S3. Test the airtightness of the first airtightness test chamber; S4. After the airtightness of the first airtightness test chamber meets the requirements, assemble the second valve module (13), the first valve module (12) and the electromagnetic mechanism (11) to form an electromagnetic valve. S5. The solenoid valve is installed on the second test fixture (3) so that the valve holder (131), the solenoid mechanism (11) and the second test fixture (3) surround and form a second airtight test chamber, which is separated from the valve port (1314) by a valve core (121); S6. Separate the second valve core (132) from the second valve port (1316) so that the first valve port (1314), the valve cavity (1315), the second valve port (1316) and the external environment are connected in sequence; S7. Test the airtightness of the second airtightness test chamber.

2. The test method according to claim 1, characterized in that, The valve holder (131) includes a first frame (1311) and a second frame (1312) that are detachably connected. The first frame (1311) has an air inlet chamber (1313), the first valve port (1314), and a mounting cavity with one open end. The second frame (1312) has the second valve port (1313). Assembling the two-way valve module (13) includes: The two sealing caps (1322) are coaxially connected to one end of the two valve shaft (1321) to form a two valve core (132). The two elastic elements (133) are inserted into the mounting cavity through the opening of the mounting cavity; The second valve core (132) is inserted into the mounting cavity through the opening of the mounting cavity until the second valve shaft (1321) passes through the first valve port (1314) and the second sealing cap (1322) is located in the mounting cavity; The second frame (1312) is installed on the first frame (1311) so that the second frame (1312) seals the opening of the mounting cavity and surrounds the first frame (1311) to form the valve cavity (1315). The two sealing caps (1322) seal the two valve ports (1316) under the action of the two elastic elements (133).

3. The test method according to claim 1, characterized in that, The first test fixture (2) includes a first test seat (21) and a sealing member (22). The first test seat (21) has a first positioning groove (211). The first end of the first positioning groove (211) is open and the second end is provided with a vent hole (212). The sealing member (22) is provided with a positioning slot (223). In step S2, installing the two-way valve module (13) onto the first test fixture (2) specifically includes: Insert the valve holder (131) of the two-way valve module (12) into the first positioning groove (211) until the valve holder (131) abuts against the bottom of the first positioning groove (211); The second valve core (132) is inserted into the positioning slot (223) and the sealing member (22) is pushed close to the first detection seat (21) until the sealing member (22) blocks the opening of the first positioning groove (211). The second valve core (132) and the bottom of the positioning slot (223) are spaced apart.

4. The test method according to claim 3, characterized in that, The first detection seat (21) is provided with a first air supply channel communicating with the first positioning groove (211). Step S3 specifically includes: Gas is introduced into the first airtightness test chamber through the first gas supply channel so that the first airtightness test chamber reaches a preset pressure. Detect whether there is a gas leak in the first airtightness test chamber.

5. The test method according to any one of claims 1-4, characterized in that, The second test fixture (3) includes a second test seat (31) and a pressing member (331). The second test seat (31) has a second positioning groove (311) with one end open. A bottom through hole (322) is provided at the bottom of the second positioning groove (311). In step S5, installing the solenoid valve onto the second test fixture (3) specifically includes: Insert the valve holder (131) into the second positioning groove (311) until the side of the valve holder (131) away from the electromagnetic mechanism (11) abuts against the bottom of the second positioning groove (311) and the electromagnetic mechanism (11) blocks the opening of the second positioning groove (311); Control the pressing member (331) to move in the direction toward the second detection seat (31) until the pressing member (331) presses against the side of the electromagnetic mechanism (11) away from the valve holder (131).

6. The test method according to claim 5, characterized in that, The second test fixture (3) includes a pusher (321) and a pusher drive (322). In step S6, separating the second valve core (132) from the second valve port (1316) specifically includes: Control the action of the push drive (322) to drive the push member (321) to move in the direction toward the second detection seat (31) until the push member (321) passes through the bottom through hole (322) and the second valve port (1316) and pushes the second valve core (132) away from the second valve port (1316).

7. A testing fixture, characterized in that, The testing fixture, applied to the testing method as described in claims 1-6, comprises: The first test fixture (2) includes a first test seat (21) and a sealing member (22). The first test seat (21) has a first positioning groove (211). One end of the first positioning groove (211) is open and a vent hole (212) is provided at the bottom of the groove. The side wall of the first positioning groove (211) has a first air supply channel that connects to the first positioning groove (211). The sealing member (22) has a positioning slot (223). The positioning slot (223) is used to be inserted and cooperated with the second valve core (132). The sealing member (22) can block the opening of the first positioning groove (211). The second test fixture (3) includes a second detection seat (31), a pressing mechanism (33) and a pushing mechanism (32). The second detection seat (31) has a second positioning groove (311). One end of the second positioning groove (311) is open and a bottom through hole (322) is provided at the bottom of the groove. The side wall of the second positioning groove (311) has a second air supply channel that connects to the second positioning groove (311). The pressing mechanism (33) is opposite to the groove opening of the second positioning groove (311) and is spaced apart to press against the electromagnetic mechanism (11). The pushing mechanism (32) is directly opposite to the bottom through hole (322) to push the second valve core (132) away from the second valve port (1316).

8. The testing fixture according to claim 7, characterized in that, The first positioning groove (211) is a frustoconical groove. The inner diameter of the first positioning groove (211) gradually increases along the direction towards the opening of the first positioning groove (211), and the minimum inner diameter of the first positioning groove (211) is greater than or equal to the maximum outer diameter of the valve holder (131). And / or, the second positioning groove (311) is a frustoconical groove, the inner diameter of the second positioning groove (311) gradually increases along the direction toward the opening of the second positioning groove (311), and the minimum inner diameter of the second positioning groove (311) is greater than or equal to the maximum outer diameter of the valve holder (131).

9. The testing fixture according to claim 7, characterized in that, The sealing component (22) includes a sealing main part (221), which has a boss part (222) protruding from one end toward the first detection seat (21). The sealing main part (221) can abut against the end face of the first detection seat (21) to block the opening of the first positioning groove (211). The boss part (222) can be inserted into the first positioning groove (211) and is spaced apart from the groove wall of the first positioning groove (211).

10. The testing fixture according to any one of claims 7-9, characterized in that, The pushing mechanism (32) includes a pushing member (321) and a pushing drive member (322). The pushing drive member (322) is connected to the pushing member (321). The pushing drive member (322) drives the pushing member (321) to move in a direction toward or away from the second detection seat (31). The pushing member (321) can pass through the bottom through hole (322) and the second valve port (1316). And / or, the second test fixture (3) further includes a positioning seat (34), which is located between the second detection seat (31) and the pressing mechanism (33). The upper end of the positioning seat (34) is provided with a positioning groove (341), which is used to engage with the electromagnetic mechanism (11).

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