Solenoid valve and processing method therefor

Abstract

Disclosed is a solenoid valve, comprising: a valve body assembly (100), which has a valve port and a circulation cavity (101), wherein the valve port is in communication with the circulation cavity, a first connecting pipe (01) and a second connecting pipe (02) are connected to two sides of the valve port, and the valve body assembly further comprises a piston portion (200), which is movably arranged inside the circulation cavity, is configured to block or open the valve port and has a piston cavity (201); a pilot valve assembly (300), which has a pilot valve cavity (301) and a check valve portion, wherein the pilot valve cavity is in communication with the piston cavity, the first connecting pipe and the second connecting pipe can be in communication with the pilot valve cavity by means of the check valve portion, and the pilot valve assembly can control the piston cavity to be brought into communication with the first connecting pipe or the second connecting pipe, so as to drive the piston portion to move; and a connecting base (400), one end of which is in communication with the piston cavity, and the other end of which is in communication with the pilot valve cavity, wherein the connecting base has a balance structure, so as to communicate the circulation cavity with the piston cavity, and the pilot valve assembly is fixedly connected to the valve body assembly by means of the connecting base. Further disclosed is a processing method for the solenoid valve. The solenoid valve can solve the problem in the prior art of the solenoid valve test cost being relatively high.

Description

Solenoid valves and their processing methods

[0001] This application claims priority to the patent application filed on March 11, 2025, with application number 2025102931608, entitled "Solenoid Valve and Processing Method Thereof". Technical Field

[0002] This application relates to the field of solenoid valve technology, and more specifically, to a solenoid valve and its processing method. Background Technology

[0003] Currently, solenoid valves are commonly used in thermal management systems or fluid management systems to control fluid flow.

[0004] Existing solenoid valves typically include a pilot valve assembly and a valve body assembly. The valve body assembly has a valve port and a piston assembly. The pilot valve assembly controls the movement of the piston assembly by controlling the pressure within the piston chamber of the piston assembly, thereby causing the piston assembly to block or open the valve port. In traditional solenoid valves, the pilot valve assembly needs to be fixed to the valve body assembly and the piston assembly to support the pilot valve assembly and enable it to communicate with the piston chamber. The pilot valve assembly also needs to have a balancing structure connecting the cavities inside and outside the piston assembly.

[0005] Therefore, when testing the flow performance of a solenoid valve, the pilot valve assembly and the valve body assembly need to be welded and fixed together before the whole assembly is tested. If some parts of the solenoid valve fail to meet the usage requirements due to processing or assembly errors, the entire solenoid valve will be scrapped, resulting in high production and testing costs.

[0006] Application content

[0007] This application provides a solenoid valve and its processing method to solve the problem of high testing costs for solenoid valves in the prior art.

[0008] According to one aspect of this application, an electromagnetic valve is provided, comprising: a valve body assembly having a valve port and a flow chamber communicating with the flow chamber, a first connecting pipe and a second connecting pipe connected to both sides of the valve port, the valve body assembly further comprising a piston portion movably disposed within the flow chamber, the piston portion being used to block or open the valve port, the piston portion having a piston chamber; a pilot valve assembly having a pilot valve chamber and a one-way valve portion communicating with the piston chamber, the first connecting pipe and the second connecting pipe being able to communicate with the pilot valve chamber through the one-way valve portion, the pilot valve assembly being able to control the piston chamber to communicate with the first connecting pipe or the second connecting pipe to drive the piston portion to move; and a connecting seat having one end communicating with the piston chamber and the other end communicating with the pilot valve chamber, the connecting seat having a balancing structure to connect the flow chamber and the piston chamber, the pilot valve assembly being fixedly connected to the valve body assembly through the connecting seat.

[0009] Applying the technical solution of this application, the valve body assembly and the pilot valve assembly are connected and communicated through a connecting seat. The pilot valve assembly can control the piston part to block or open the valve port by controlling the pressure in the piston chamber, thereby realizing the function of the solenoid valve in controlling the flow on and off of fluid. Furthermore, by setting a balancing structure on the connecting seat, the valve body assembly and the connecting seat can be directly connected during product testing to directly test the flow function of the valve body assembly. This eliminates the need for overall testing after the assembly of the valve body assembly and the pilot valve assembly. The performance of the pilot valve assembly and the valve body assembly can be tested separately before assembly to select qualified products. When unqualified products are found, there is no need to scrap the entire solenoid valve, reducing the number of scrapped parts and lowering the overall production cost of the solenoid valve.

[0010] Furthermore, the pilot valve assembly has a pilot valve seat and a sleeve that are interconnected, and a pilot valve cavity is formed between the pilot valve seat and the sleeve. The pilot valve cavity is connected to the piston cavity through the pilot valve seat, and the pilot valve seat is fixedly connected to the connecting seat.

[0011] Furthermore, the valve port includes a first valve port and a second valve port, which are disposed opposite to each other on both sides of the flow chamber. The first valve port is connected to a first connecting pipe, and the second valve port is connected to a second connecting pipe. The piston part includes a first piston, a second piston, and a piston sleeve. The piston sleeve is fixedly disposed in the flow chamber. Both the first piston and the second piston are movably connected to the piston sleeve. A piston chamber is formed between the first piston, the second piston, and the piston sleeve. The first piston is disposed opposite to the first valve port to block or open the first valve port; the second piston is disposed opposite to the second valve port to block or open the second valve port.

[0012] Furthermore, the valve body assembly includes a valve tube having a flow cavity, a mounting hole on the side wall of the valve tube, a positioning hole on the side wall of the piston portion, the mounting hole and the positioning hole being coaxially arranged, and the connecting seat being sequentially inserted into the mounting hole and the positioning hole.

[0013] Furthermore, the connector has a first insertion section and a second insertion section. The first insertion section is inserted into the positioning hole, and the second insertion section is inserted into the mounting hole. The diameter of the first insertion section is smaller than the diameter of the second insertion section. A first stepped surface is formed between the first insertion section and the second insertion section, and the first stepped surface abuts against the outer wall of the piston part.

[0014] Furthermore, a first welding groove is provided on the outer periphery of the positioning hole, and a second welding groove is provided on the outer periphery of the mounting hole. Both the first welding groove and the second welding groove are used to accommodate the welding ring.

[0015] Furthermore, a balance hole is provided on the side wall of the connecting seat. The balance hole forms a balance structure. The balance hole is located inside the valve tube and is used to connect the flow chamber and the piston chamber.

[0016] Furthermore, the minimum distance from the balance hole to the inner wall of the flow cavity is greater than or equal to 3 mm.

[0017] Furthermore, the connecting seat is a tubular structure, with one end of the tubular structure connected to the pilot valve cavity and the other end of the tubular structure connected to the piston cavity.

[0018] Furthermore, the end of the pilot valve seat is provided with a plug-in protrusion, which is inserted into the connecting seat. A second stepped surface is formed between the plug-in protrusion and the side wall of the pilot valve seat, and the second stepped surface abuts against the end face of the connecting seat.

[0019] Furthermore, the outer wall of the connecting seat has a ring-shaped stop boss located at the end of the connecting seat near the pilot valve seat. The stop boss has an outwardly expanding section, the diameter of which gradually increases in the direction close to the second stepped surface.

[0020] Furthermore, the pilot valve seat has a connecting hole, one end of which is connected to the pilot valve cavity, and the other end of which is connected to the connecting seat. The axis of the connecting hole is parallel to the axis of the pilot valve seat.

[0021] According to another aspect of this application, a method for processing a solenoid valve is provided. The solenoid valve is the aforementioned solenoid valve. The processing method includes:

[0022] Step 1: Assemble the valve body assembly and the pilot valve assembly separately;

[0023] Step 2: Weld the valve body assembly to the connecting seat, and test the performance of the valve body assembly and the pilot valve assembly respectively;

[0024] Step 3: Weld the connecting seat and the pilot valve assembly.

[0025] By applying the processing method of this application, the performance of the valve body assembly 100 and the pilot valve assembly 300 are tested respectively, and qualified products are selected. When unqualified products are found, there is no need to scrap the entire solenoid valve, thereby reducing the number of scrapped parts and lowering the overall production cost of the solenoid valve.

[0026] Furthermore, in step one, the steps of assembling the valve body assembly include: placing welding rings in the first welding groove and the second welding groove, assembling the connecting seat and the valve body assembly, and performing furnace welding on the connecting seat and the valve body assembly using a tunnel furnace. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 shows a schematic diagram of the solenoid valve provided in this application when it is in the closed state;

[0029] Figure 2 shows a schematic diagram of the solenoid valve provided in this application when it is in the open state;

[0030] Figure 3 shows a schematic diagram of the valve tube and piston sleeve assembly provided in this application;

[0031] Figure 4 shows a schematic diagram of the piston sleeve provided in this application;

[0032] Figure 5 shows a schematic diagram of the connecting seat provided in this application;

[0033] Figure 6 shows a side view of the connection seat and valve body assembly provided in this application;

[0034] Figure 7 shows a side view of the solenoid valve provided in this application;

[0035] Figure 8 shows a schematic diagram of the connection seat and the pilot valve seat provided in this application;

[0036] Figure 9 shows a schematic diagram of the structure of the support plate provided in this application;

[0037] Figure 10 shows a schematic diagram of the structure provided in this application where the first check valve is closed while the second check valve is open;

[0038] Figure 11 shows a schematic diagram of the structure provided in this application, in which the second check valve is closed while the first check valve is open.

[0039] The above-mentioned figures include the following reference numerals: 01, first connecting pipe; 02, second connecting pipe; 03, first capillary tube; 04, second capillary tube; 100, valve body assembly; 101, flow chamber; 110, valve tube; 111, first valve port; 112, second valve port; 200, piston part; 201, piston chamber; 210, first piston; 220, second piston; 230, piston sleeve; 231, positioning hole; 232, first welding groove; 233, positioning boss; 240, fixing plate; 241, fixing hole; 300, Pilot valve assembly; 301, Pilot valve cavity; 310, Pilot valve seat; 311, Connecting hole; 312, First connecting hole; 313, Second connecting hole; 314, Insertion protrusion; 315, Second stepped surface; 320, Sleeve; 330, First check valve; 331, First check valve seat; 332, First check valve core; 333, First opening; 334, First check valve port; 335, First diameter reducing section; 340, Second check valve; 341, Second check valve seat; 342, Second check valve core; 343, Second opening; 344, Second check valve port; 345, Second diameter reducing section; 400, Connecting seat; 410, First insertion section; 411, First stepped surface; 420, Second insertion section; 430, Balance hole; 440, Stop protrusion. Detailed Implementation

[0040] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] As shown in Figures 1 and 2, this embodiment of the application provides a solenoid valve, which includes a valve body assembly 100, a piston portion 200, a pilot valve assembly 300, and a connecting seat 400. The valve body assembly 100 has a valve port and a flow chamber 101, which are connected. A first connecting pipe 01 and a second connecting pipe 02 are connected to both sides of the valve port. The valve body assembly 100 also includes a piston portion 200, which is movably disposed within the flow chamber 101. The piston portion 200 is used to block or open the valve port and has a piston chamber 201. The pilot valve assembly 300 is disposed on the valve body assembly 100 and has a pilot valve chamber 301 and a one-way valve portion. The pilot valve chamber 301 is connected to the piston chamber 201. The first connecting pipe 01 and the second connecting pipe 02 can communicate with the pilot valve chamber 301 through the one-way valve portion. The pilot valve assembly 300 can control the piston chamber 201 to connect to the first connecting pipe 01 or the second connecting pipe 02 to drive the piston portion 200 to move. The connecting seat 400 is disposed on the valve body assembly 100. One end of the connecting seat 400 is connected to the piston chamber 201, and the other end of the connecting seat 400 is connected to the pilot valve chamber 301. The connecting seat 400 has a balancing structure to connect the flow chamber 101 and the piston chamber 201. The pilot valve assembly 300 is fixedly connected to the valve body assembly 100 through the connecting seat 400.

[0042] Applying the technical solution of this application, the valve body assembly 100 and the pilot valve assembly 300 are connected and communicated through the connecting seat 400. The pilot valve assembly 300 can control the piston part 200 to block or open the valve port by controlling the pressure in the piston chamber 201, thereby realizing the function of the solenoid valve controlling the flow on and off. Furthermore, by setting a balancing structure on the connecting seat 400, the valve body assembly 100 and the connecting seat 400 can be directly connected during product testing to directly test the flow function of the valve body assembly 100. This eliminates the need for overall testing after the assembly of the valve body assembly 100 and the pilot valve assembly 300. The performance of the pilot valve assembly 300 and the valve body assembly 100 can be tested separately before assembly to select qualified products. When unqualified products are found, it is not necessary to scrap the entire solenoid valve, reducing the number of scrapped parts and lowering the overall production cost of the solenoid valve.

[0043] In the solenoid valve provided in this application, the pilot valve assembly 300 has a pilot valve seat 310 and a sleeve 320 connected to each other. A pilot valve cavity 301 is formed between the pilot valve seat 310 and the sleeve 320. The pilot valve cavity 301 is connected to the piston cavity 201 through the pilot valve seat 310. The pilot valve seat 310 is fixedly connected to the connecting seat 400. The one-way valve part includes a first one-way valve 330 and a second one-way valve 340. The first one-way valve 330 and the second one-way valve 340 are both disposed on the pilot valve seat 310. The first one-way valve 330 is unidirectionally connected from the pilot valve cavity 301 to the first connecting pipe 01, and the second one-way valve 340 is unidirectionally connected from the pilot valve cavity 301 to the second connecting pipe 02. When fluid flows from the first connector 01 to the second connector 02, the first check valve 330 is not connected to the pilot valve chamber 301, while the second check valve 340 is connected to the pilot valve chamber 301. When fluid flows from the second connector 02 to the first connector 01, the first check valve 330 is connected to the pilot valve chamber 301, while the second check valve 340 is not connected to the pilot valve chamber 301. Thus, when fluid flows bidirectionally in both the first connector 01 and the second connector 02, the check valves can connect to the pilot valve chamber 301 in both cases, achieving the fluid flow function. The pilot valve assembly 300 has a relatively set open state and a closed state. When the pilot valve assembly 300 is in the open state, the pilot valve chamber 301 can connect to one of the first connector 01 or the second connector 02 through either the first check valve 330 or the second check valve 340. When the pilot valve assembly 300 is in the closed state, neither the first connector 01 nor the second connector 02 is connected to the pilot valve chamber 301.

[0044] In this application, a first capillary tube 03 is provided between the first one-way valve 330 and the first connecting pipe 01 to connect the first connecting pipe 01 and the first one-way valve 330; a second capillary tube 04 is provided between the second one-way valve 340 and the second connecting pipe 02 to connect the second connecting pipe 02 and the second one-way valve 340.

[0045] Referring to Figures 10 and 11, the first one-way valve 330 includes a first one-way valve seat 331 and a first one-way valve core 332. One end of the first one-way valve seat 331 has a first opening 333, and the other end has a first one-way valve port 334 between it and the pilot valve seat 310. A first flow structure is provided on the side wall of the first one-way valve seat 331. The first one-way valve core 332 is adapted to the inner wall size of the first one-way valve seat 331 and is movably disposed in the first one-way valve seat 331 to connect or block the first one-way valve port 334. The diameter of the first opening 333 is smaller than the diameter of the first one-way valve core 332. Fluid can enter the first one-way valve seat 331 through the first opening 333. Because the first one-way valve core 332 is adapted to the inner wall size of the first one-way valve seat 331, the fluid can push the first one-way valve core 332 to move towards the first one-way valve port 334 to block the first one-way valve port 334. The second one-way valve 340 includes a second one-way valve seat 341 and a second one-way valve core 342. One end of the second one-way valve seat 341 has a second opening 343, and the other end has a second one-way valve port 344 between it and the pilot valve seat 310. A second flow structure is provided on the side wall of the second one-way valve seat 341. The second one-way valve core 342 is adapted to the inner wall size of the second one-way valve seat 341 and is movably disposed within the second one-way valve seat 341 to connect or block the second one-way valve port 344. The diameter of the second opening 343 is smaller than the diameter of the second one-way valve core 342. Fluid can enter the second one-way valve seat 341 through the second opening 343. Because the second one-way valve core 342 is adapted to the inner wall size of the second one-way valve seat 341, the fluid can push the second one-way valve core 342 towards the second one-way valve port 344 to block the second one-way valve port 344.

[0046] Specifically, the first flow structure and the second flow structure can be configured as holes or grooves, as long as they can meet the flow requirements of the fluid.

[0047] Specifically, the pilot valve seat 310 has a first connecting hole 312 and a second connecting hole 313 that are interconnected. One end of the first connecting hole 312 is connected to the side wall of the second connecting hole 313. The first one-way valve port 334 and the second one-way valve port 344 are respectively connected to the two ends of the second connecting hole 313. Thus, when the first one-way valve core 332 moves, the fluid in the first one-way valve seat 331 can enter the second one-way valve seat 341 through the second connecting hole 313, pushing the second one-way valve core 342 to move and open the second one-way valve port 344. When the second one-way valve core 342 is pushed to move by the fluid pressure in the second connecting pipe 02, the first one-way valve core 332 also moves with the movement of the second one-way valve core 342. The pilot valve assembly 300 can block or open the end of the first connecting hole 312 away from the second connecting hole 313 to switch between the open and closed states.

[0048] Specifically, the first one-way valve port 334 has a first variable diameter section 335, the inner diameter of which gradually increases along the direction from the first one-way valve port 334 to the first opening 333. When the first one-way valve core 332 blocks the first one-way valve port 334, the first one-way valve core 332 abuts against the inner wall of the first variable diameter section 335 to restrict the movement of the first one-way valve core 332 away from the first one-way valve port 334. The second one-way valve port 344 has a second variable diameter section 345, the inner diameter of which gradually increases along the direction from the second one-way valve port 344 to the second opening 343. When the second one-way valve core 342 blocks the second one-way valve port 344, the second one-way valve core 342 abuts against the inner wall of the second variable diameter section 345 to restrict the movement of the second one-way valve core 342 away from the second one-way valve port 344.

[0049] Specifically, the valve port includes a first valve port 111 and a second valve port 112, which are disposed opposite to each other on both sides of the flow cavity 101. The first valve port 111 is connected to a first connecting pipe 01, and the second valve port 112 is connected to a second connecting pipe 02. The piston part 200 includes a first piston 210, a second piston 220, and a piston sleeve 230. The piston sleeve 230 is fixedly disposed in the flow cavity 101. The first piston 210 and the second piston 220 are both movably connected to the piston sleeve 230. A piston cavity 201 is formed between the first piston 210, the second piston 220, and the piston sleeve 230. The first piston 210 is disposed opposite to the first valve port 111 to block or open the first valve port 111; the second piston 220 is disposed opposite to the second valve port 112 to block or open the second valve port 112. By setting the piston section 200 in the form of a bidirectional piston of the first piston 210 and the second piston 220, when the fluid flows bidirectionally in the first pipe 01 and the second pipe 02, regardless of the direction of the fluid, the movement direction of one of the pistons of the first piston 210 and the second piston 220 can be the same as the direction of the fluid movement, thus ensuring the response speed and sealing stability of the solenoid valve when it is closed.

[0050] In some embodiments of this application, the piston sleeve 230 may be sleeved on the outside of the first piston 210 and the second piston 220, and the first piston 210 and the second piston 220 may be movably disposed inside the piston sleeve 230. In other embodiments of this application, the first piston 210 and the second piston 220 may also be sleeved on the outside of the piston sleeve 230.

[0051] Furthermore, an elastic element can be provided between the first piston 210 and the second piston 220 to provide an elastic force that keeps the first piston 210 and the second piston 220 away from each other, thereby improving the motion performance of the first piston 210 and the second piston 220.

[0052] Specifically, the end of the first piston 210 facing the first valve port 111 has a first valve opening end face. When the first piston 210 blocks the first valve port 111, there is a gap between the first valve opening end face and the inner wall of the flow cavity 101. The end of the second piston 220 facing the second valve port 112 has a second valve opening end face. When the second piston 220 blocks the second valve port 112, there is a gap between the second valve opening end face and the inner wall of the flow cavity 101. With the above configuration, when the first piston 210 opens the first valve port 111 and the second piston 220 blocks the second valve port 112, after the fluid enters the flow chamber 101 through the first valve port 111, the fluid can enter the gap between the second valve opening end face and the inner wall of the flow chamber 101, so as to provide a driving force for the second piston 220 to move away from the second valve port 112, thereby realizing the opening of the solenoid valve; when the second piston 220 opens the second valve port 112 and the first piston 210 blocks the first valve port 111, after the fluid enters the flow chamber 101 through the second valve port 112, the fluid can enter the gap between the first valve opening end face and the inner wall of the flow chamber 101, so as to provide a driving force for the first piston 210 to move away from the first valve port 111, thereby realizing the opening of the solenoid valve.

[0053] Referring to Figures 1 and 2, the switching action of the solenoid valve during the transition from the closed state to the open state is as follows:

[0054] When fluid flows from the first connector 01 to the second connector 02, the pressure in the first connector 01 is greater than the pressure in the second connector 02. At this time, the pilot valve assembly 300 can switch to the open state, the first check valve 330 closes, the first connector 01 is not connected to the pilot valve chamber 301, the second check valve 340 opens, and the second connector 02 can connect to the pilot valve chamber 301 through the second check valve 340. Thus, the piston chamber 201 can connect to the second connector 02, and the pressure in the piston chamber 201 decreases. At this time, the pressure in the first connector 01 is greater than the pressure in the piston chamber 201, and the first piston 210 experiences a greater pressure from the first connector 01 than the piston chamber 201 and the elastic element. Due to the elastic force, the first piston 210 moves away from the first valve port 111, the first valve port 111 opens, and the fluid enters the flow chamber 101 and enters the gap between the second valve end face and the flow chamber 101, providing pressure to the second piston 220 in the direction away from the second valve port 112. The pressure of the fluid at the end of the second piston 220 is greater than the pressure in the piston chamber 201 and the pressure of the elastic element. Driven by the pressure difference, the second piston 220 can move away from the second valve port 112, the second valve port 112 opens, the piston part 200 switches to the conducting state, and the fluid can flow from the first pipe 01 to the second pipe 02 through the flow chamber 101.

[0055] When fluid flows from the second connector 02 to the first connector 01, the pressure in the second connector 02 is greater than the pressure in the first connector 01. At this time, the pilot valve assembly 300 can switch to the open state, the second check valve 340 closes, the second connector 02 is not connected to the pilot valve chamber 301, the first check valve 330 opens, and the first connector 01 can connect to the pilot valve chamber 301 through the first check valve 330. Thus, the piston chamber 201 can connect to the first connector 01, and the pressure in the piston chamber 201 decreases. At this time, the pressure in the second connector 02 is greater than the pressure in the piston chamber 201, and the second piston 220 experiences a greater pressure from the second connector 02 than from the piston chamber 201. Due to the elastic force of the elastic element, the second piston 220 moves away from the second valve port 112, the second valve port 112 opens, and the fluid enters the flow chamber 101, entering the gap between the first valve end face and the flow chamber 101, providing pressure to the first piston 210 in the direction away from the first valve port 111. The pressure of the fluid at the end of the first piston 210 is greater than the pressure in the piston chamber 201 and the pressure of the elastic element. Driven by the pressure difference, the first piston 210 can move away from the first valve port 111, and the piston part 200 switches to the conducting state, allowing the fluid to flow from the second pipe 02 to the first pipe 01 through the flow chamber 101.

[0056] Referring to Figures 1 and 2, the switching action of the solenoid valve during the transition from the open to the closed state is as follows:

[0057] When the pilot valve assembly 300 is switched to the closed state, neither the first connecting pipe 01 nor the second connecting pipe 02 is connected to the pilot valve chamber 301. The fluid in the flow chamber 101 flows into the piston chamber 201 through the balance structure on the connecting seat 400. The pressure in the piston chamber 201 increases. The piston chamber 201 exerts pressure on the first piston 210 and the second piston 220 in conjunction with the elastic element, causing the first piston 210 to move toward the first valve port 111 and the second piston 220 to move toward the second valve port 112. The piston part 200 blocks the first valve port 111 through the first piston 210 and blocks the second valve port 112 through the second piston 220. Neither the first connecting pipe 01 nor the second connecting pipe 02 is connected to the flow chamber 101.

[0058] As shown in Figures 3 to 6, the valve body assembly 100 includes a valve tube 110 with a flow chamber 101. A mounting hole is provided on the side wall of the valve tube 110, and a positioning hole 231 is provided on the side wall of the piston portion 200. The mounting hole and the positioning hole 231 are coaxially arranged, and the connecting seat 400 is sequentially inserted into the mounting hole and the positioning hole 231. Through this arrangement, the connecting seat 400 is engaged with the mounting hole and the positioning hole 231, and these two holes limit the positioning accuracy and connection stability of the connecting seat 400, ensuring its support performance for the pilot valve assembly 300.

[0059] Referring to Figures 5 and 6, the connector 400 has a first insertion section 410 and a second insertion section 420. The first insertion section 410 is inserted into the positioning hole 231, and the second insertion section 420 is inserted into the mounting hole. The diameter of the first insertion section 410 is smaller than the diameter of the second insertion section 420. A first stepped surface 411 is formed between the first insertion section 410 and the second insertion section 420, and the first stepped surface 411 abuts against the outer wall of the piston part 200. This configuration allows the first stepped surface 411 to cooperate with the piston part 200 to limit the installation position of the connector 400, ensuring that the connector 400 can be installed in the correct position.

[0060] Specifically, a first welding groove 232 is provided on the outer periphery of the positioning hole 231, and a second welding groove is provided on the outer periphery of the mounting hole. Both the first welding groove 232 and the second welding groove are used to accommodate the welding ring. The connecting seat 400 connects the piston part 200 and the valve body assembly 100 simultaneously through welding, so as to improve the connection strength between the connecting seat 400 and the valve body assembly 100 and better support the pilot valve assembly.

[0061] In this application, the connecting seat 400 is a tubular structure, with one end of the tubular structure connected to the pilot valve seat 310 and the other end connected to the piston chamber 201. This configuration allows for the direct discharge of waste materials such as iron filings through the tubular structure during the machining of the connecting seat 400, ensuring machining quality, while also providing better support for the pilot valve assembly 300.

[0062] As shown in the reference, a balance hole 430 is provided on the side wall of the connecting seat 400. The balance hole 430 forms a balance structure. The balance hole 430 is located in the valve tube 110, that is, the balance hole 430 is located in the flow chamber 101. It is used to connect the flow chamber 101 and the piston chamber 201. The fluid in the flow chamber 101 can enter the pilot valve chamber 301, increase the pressure in the piston chamber 201, and cause the first piston 210 and the second piston 220 to move.

[0063] Furthermore, the minimum distance from the balance hole 430 to the inner wall of the flow cavity 101 is greater than or equal to 3mm. This arrangement keeps the balance hole 430 away from the welding area between the valve body assembly 100 and the connecting seat 400, reducing the risk of solder melting into the balance hole 430 and ensuring the connectivity of the balance hole 430. Specifically, the minimum distance from the balance hole 430 to the inner wall of the flow cavity 101 can be set to 3mm, 3.5mm, or 4mm. The balance hole 430 only needs to be located on the side wall of the second insertion section 420, ensuring connectivity to the flow cavity 101.

[0064] Referring to FIG8, in one embodiment of this application, a plug-in protrusion 314 is provided on the end of the pilot valve seat 310. The plug-in protrusion 314 is inserted into the connecting seat 400, and a second stepped surface 315 is formed between the plug-in protrusion 314 and the side wall of the pilot valve seat 310. The second stepped surface 315 abuts against the end face of the connecting seat 400. With the above arrangement, the connection strength between the pilot valve seat 310 and the connecting seat 400 can be improved by the plug-in protrusion 314, while limiting the displacement of the pilot valve seat 310, ensuring that the pilot valve seat 310 can be installed in place without excessively encroaching on the internal space of the connecting seat 400.

[0065] Specifically, laser welding can be used to connect the pilot valve seat 310 and the connecting seat 400 at the connection point to improve the connection effect between the pilot valve seat 310 and the connecting seat 400.

[0066] Furthermore, the outer wall of the connecting seat 400 has an annularly arranged stop protrusion 440. The stop protrusion 440 is located at the end of the connecting seat 400 near the pilot valve seat 310. The stop protrusion 440 has an outwardly expanding section, the diameter of which gradually increases along the direction close to the second stepped surface 315. Because the solder melts into a liquid state and flows when the connecting seat 400 is welded to the valve pipe 110, the weld joint between the connecting seat 400 and the valve pipe 110 is adjacent to the weld joint between the connecting seat 400 and the pilot valve seat 310. By setting the outwardly expanding section, the molten solder can be stopped, so that the two weld joints are not on the same plane. This prevents the molten solder from rising to the connection between the pilot valve seat 310 and the connecting seat 400 and affecting the welding effect, thus ensuring the connection strength and sealing effect between the pilot valve seat 310 and the connecting seat 400.

[0067] Furthermore, the pilot valve seat 310 has a communicating hole 311. One end of the communicating hole 311 communicates with the pilot valve cavity 301, and the other end of the communicating hole 311 communicates with the connecting seat 400. The axis of the communicating hole 311 is parallel to the axis of the pilot valve seat 310. This configuration, where the communicating hole 311 is a straight hole parallel to the pilot valve seat 310, facilitates the positioning of the pilot valve seat 310 and the communicating hole 311 by the fixture, and reduces the machining difficulty of the pilot valve seat 310.

[0068] Specifically, multiple connecting holes 311 are provided, and the multiple connecting holes 311 are arranged in a ring around the axis of the pilot valve seat 310 to increase the flow area between the pilot valve cavity 301 and the connecting seat 400, improve the smoothness of fluid flow, and reduce the overall weight of the pilot valve assembly 300 to achieve the lightweighting of the solenoid valve.

[0069] As shown in the figure, a fixing plate 240 is also provided between the piston sleeve 230 and the flow cavity 101. The piston sleeve 230 is fixedly installed in the flow cavity 101 by the fixing plate 240, which has a channel for fluid flow. With the above arrangement, the fixing plate 240 can support the piston sleeve 230 without hindering the flow of fluid.

[0070] Referring to Figures 7 and 9, the fixing plate 240 has a fixing hole 241, through which the piston sleeve 230 passes, allowing fluid to flow through the gap between the outer wall of the piston sleeve 230 and the inner wall of the piston cavity 201. This ensures uniform fluid flow, prevents excessive bends, and guarantees efficient fluid flow. Multiple support rods are annularly arranged on the outer side of the fixing hole 241, with the gaps between the support rods forming channels for fluid flow. The piston sleeve 230 has an annularly arranged positioning boss 233 in its middle. Two fixing plates 240 are provided, positioned opposite each other at the ends of the positioning boss 233. The end faces of the fixing plates 240 abut against the positioning boss 233 to limit the relative displacement of the fixing plates 240 and ensure their supporting effect.

[0071] According to another embodiment of this application, a method for processing a solenoid valve is provided, the method comprising:

[0072] Step 1: Assemble the valve tube 110 and piston part 200 to form valve body assembly 100, and assemble pilot valve seat 310, one-way valve part and sleeve to form pilot valve assembly 300.

[0073] Step 2: Weld the valve body assembly 100 and the connecting seat 400 together, test the performance of the valve body assembly 100 and the pilot valve assembly 300 respectively, and select qualified products. When unqualified products are found, there is no need to scrap the entire solenoid valve, thus reducing the number of scrapped parts and lowering the overall production cost of the solenoid valve.

[0074] Step 3: Weld the pilot valve assembly 300 and the connecting seat 400 to complete the overall assembly of the solenoid valve.

[0075] Specifically, in step one, the assembly of the valve body assembly 100 includes: welding the connecting fixing plate 240 and the piston sleeve 230; inserting the fixed piston sleeve 230 and the fixing plate 240 into the valve pipe 110; using a tooling limiter to ensure that the mounting hole and the positioning hole 231 are coaxial; and welding the connecting fixing plate 240 and the valve pipe 110. This ensures smooth installation of the connecting seat 400 and prevents deformation of the connecting seat 400 or the valve body assembly 100 during installation.

[0076] Specifically, in step one, the assembly of the valve body assembly 100 includes placing welding rings in the first welding groove 232 and the second welding groove, assembling the connecting seat 400 and the valve body assembly 100, and then performing furnace welding on the connecting seat 400 and the valve body assembly 100 using a tunnel furnace. This welding connection between the valve body assembly 100 and the connecting seat 400 allows for simultaneous welding of two parts, reducing processing costs, and the furnace welding also facilitates processing by workers.

[0077] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A solenoid valve, characterized in that, The solenoid valve includes: A valve body assembly (100) has a valve port and a flow chamber (101), the valve port and the flow chamber (101) are connected, a first connecting pipe (01) and a second connecting pipe (02) are connected to both sides of the valve port, the valve body assembly (100) also includes a piston part (200), the piston part (200) is movably disposed in the flow chamber (101), the piston part (200) is used to block or open the valve port, and the piston part (200) has a piston chamber (201); A pilot valve assembly (300) has a pilot valve chamber (301) and a one-way valve section. The pilot valve chamber (301) is connected to the piston chamber (201). The first connecting pipe (01) and the second connecting pipe (02) are connected to the pilot valve chamber (301) through the one-way valve section. The pilot valve assembly (300) can control the piston chamber (201) to connect to the first connecting pipe (01) or the second connecting pipe (02) to drive the piston section (200) to move. A connecting seat (400) is provided, one end of which is connected to the piston chamber (201) and the other end of which is connected to the pilot valve chamber (301). The connecting seat (400) has a balancing structure to connect the flow chamber (101) and the piston chamber (201). The pilot valve assembly (300) is fixedly connected to the valve body assembly (100) through the connecting seat (400).

2. The solenoid valve according to claim 1, characterized in that, The pilot valve assembly (300) has a pilot valve seat (310) and a sleeve (320) connected to each other. The pilot valve seat (310) and the sleeve (320) form the pilot valve cavity (301). The pilot valve cavity (301) is connected to the piston cavity (201) through the pilot valve seat (310). The pilot valve seat (310) is fixedly connected to the connecting seat (400).

3. The solenoid valve according to claim 2, characterized in that, The valve port includes a first valve port (111) and a second valve port (112), which are disposed opposite to each other on both sides of the flow cavity (101). The first valve port (111) is connected to the first connecting pipe (01), and the second valve port (112) is connected to the second connecting pipe (02). The piston part (200) includes a first piston (210), a second piston (220), and a piston sleeve (230), which is fixedly disposed in the flow cavity (101). Inside the piston sleeve (230), the first piston (210) and the second piston (220) are both movably connected to the piston sleeve (230). The piston cavity (201) is formed between the first piston (210), the second piston (220) and the piston sleeve (230). The first piston (210) is positioned relative to the first valve port (111) to block or open the first valve port (111); the second piston (220) is positioned relative to the second valve port (112) to block or open the second valve port (112).

4. The solenoid valve according to claim 1, characterized in that, The valve body assembly (100) includes a valve tube (110) having a flow chamber (101). The valve tube (110) has a mounting hole on its side wall, and the piston part (200) has a positioning hole (231) on its side wall. The mounting hole and the positioning hole (231) are coaxially arranged, and the connecting seat (400) is sequentially inserted into the mounting hole and the positioning hole (231).

5. The solenoid valve according to claim 4, characterized in that, The connector (400) has a first insertion section (410) and a second insertion section (420). The first insertion section (410) is inserted into the positioning hole (231), and the second insertion section (420) is inserted into the mounting hole. The diameter of the first insertion section (410) is smaller than the diameter of the second insertion section (420). A first stepped surface (411) is formed between the first insertion section (410) and the second insertion section (420). The first stepped surface (411) abuts against the outer wall of the piston portion (200).

6. The solenoid valve according to claim 5, characterized in that, The positioning hole (231) is provided with a first welding groove (232) on its outer periphery, and the mounting hole is provided with a second welding groove on its outer periphery. Both the first welding groove (232) and the second welding groove are used to accommodate the welding ring.

7. The solenoid valve according to claim 4, characterized in that, A balance hole (430) is provided on the side wall of the connecting seat (400). The balance hole (430) forms the balance structure. The balance hole (430) is located inside the valve tube (110). The balance hole (430) is used to connect the flow chamber (101) and the piston chamber (201).

8. The solenoid valve according to claim 7, characterized in that, The minimum distance from the balance hole (430) to the inner wall of the flow cavity (101) is greater than or equal to 3 mm.

9. The solenoid valve according to claim 1, characterized in that, The connecting seat (400) is a tubular structure, one end of which is connected to the pilot valve cavity (301), and the other end of which is connected to the piston cavity (201).

10. The solenoid valve according to claim 2, characterized in that, The valve seat (310) is provided with a plug-in protrusion (314) at its end. The plug-in protrusion (314) is inserted into the connecting seat (400). A second stepped surface (315) is formed between the plug-in protrusion (314) and the side wall of the valve seat (310). The second stepped surface (315) abuts against the end face of the connecting seat (400).

11. The solenoid valve according to claim 10, characterized in that, The outer wall of the connecting seat (400) has an annular stop boss (440), which is located at one end of the connecting seat (400) near the valve seat (310). The stop boss (440) has an outwardly expanding section, the diameter of which gradually increases in the direction close to the second stepped surface (315).

12. The solenoid valve according to claim 2, characterized in that, The valve seat (310) has a connecting hole (311), one end of which is connected to the valve chamber (301), and the other end of which is connected to the connecting seat (400). The axis of the connecting hole (311) is parallel to the axis of the valve seat (310).

13. A method for manufacturing a solenoid valve, characterized in that, The solenoid valve is the solenoid valve according to any one of claims 1 to 12, and the processing method includes: Step 1: Assemble the valve body assembly (100) and the pilot valve assembly (300) respectively; Step 2: Weld the valve body assembly (100) and the connecting seat (400) together, and test the performance of the valve body assembly (100) and the pilot valve assembly (300) respectively; Step 3: Weld the connecting seat (400) and the pilot valve assembly (300) together.

14. The processing method according to claim 13, characterized in that, In step one, the step of assembling the valve body assembly (100) includes: Welding rings are placed in the first welding groove (232) and the second welding groove to assemble the connecting seat (400) and the valve body assembly (100). The connecting seat (400) and the valve body assembly (100) are then furnace welded in a tunnel furnace.

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