Solenoid valve and processing method therefor

Abstract

A solenoid valve and a processing method therefor. The solenoid valve comprises: a valve body assembly, having a flow chamber, wherein two valve ports are provided at opposite ends of the flow chamber in an extension direction, respectively, and the two valve ports are each in communication with a connecting pipe; and a piston assembly, provided in the flow chamber, wherein the piston assembly comprises a piston sleeve and two pistons, the two pistons are arranged in the extension direction of the flow chamber, a piston cavity is formed between the piston sleeve and the two pistons, and the pistons are movable relative to the piston sleeve, so as to block or open the corresponding valve ports. Balancing structures are provided on end portions of the two pistons matching the valve ports, and the connecting pipes are capable of being in communication with the piston cavity by means of the balancing structures. By applying the technical solution of the present application, the problem in the existing technology that solenoid valves have a slow response speed when being closed can be solved.

Description

Solenoid valves and their processing methods

[0001] This application claims priority to the following patent applications filed on March 11, 2025, with China National Intellectual Property Administration (CNIPA) under application number 202520428120.5 entitled "Solenoid Valve"; and to the following patent applications filed on March 11, 2025, with CNIPA under application number 2025102900811 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 to control the flow of fluid. A solenoid valve typically includes a pilot valve assembly, a valve body assembly, and a piston assembly. The valve body assembly is connected in the pipeline, and the piston assembly has a movable piston. The piston moves relative to the valve port of the valve body assembly to block or open the valve port, thus controlling the flow of fluid. The piston assembly has a piston chamber, which is connected to and controls the pressure inside the piston chamber. When the pressure inside the piston chamber changes, it drives the piston to move.

[0004] In existing technologies, pilot valve assemblies typically incorporate a balancing structure. This structure allows fluid from inside the valve body assembly to flow into the piston chamber, increasing the pressure within the piston chamber and driving the piston to move towards the valve port to seal it, thus closing the valve. However, because the pilot valve assembly is usually located in the middle of the valve body assembly, the balancing structure is typically situated inside the valve body assembly's chambers. Compared to the pressure in the valve body inlet pipe, the pressure inside the valve body assembly's chambers is usually lower. This results in the piston chamber pressure not rising promptly enough when the valve closes, prolonging the closing time and reducing the solenoid valve's response speed.

[0005] Application content

[0006] This application provides a solenoid valve and its processing method to solve the problem of slow response speed when the solenoid valve is closed in the prior art.

[0007] The solenoid valve includes: a valve body assembly having a flow chamber, with two valve ports respectively provided at opposite ends of the flow chamber along its extension direction, both valve ports being connected to a connecting pipe; a piston assembly disposed within the flow chamber, the piston assembly including a piston sleeve and two pistons, the two pistons being arranged along the extension direction of the flow chamber, a piston cavity being formed between the piston sleeve and the two pistons, the pistons being able to move relative to the piston sleeve to block or open the corresponding valve ports, the piston cavity being formed between the piston sleeve and the two pistons; wherein, a balancing structure is provided on the ends of the two pistons that mate with the valve ports, and the connecting pipe is able to communicate with the piston cavity through the balancing structure.

[0008] Furthermore, the balancing structure includes a balancing hole, which is located at the end of the piston and is coaxially arranged with the flow chamber.

[0009] Furthermore, the flow area of ​​the valve port is S1, the flow area of ​​the balance hole is S2, and 0.1≤S2 / S1≤0.2.

[0010] Furthermore, the balancing structure also includes a one-way valve assembly, which is located at the balancing orifice and allows unidirectional flow from the connecting pipe to the piston chamber.

[0011] Furthermore, the piston includes a piston cylinder and a piston plate connected to each other. The piston plate is disposed at the end of the piston cylinder and has a balance hole. The one-way valve assembly includes a one-way valve seat and a one-way valve core. The one-way valve seat is disposed on the side of the piston plate near the piston cavity. The one-way valve core is movably disposed in the one-way valve seat and is used to block or open the balance hole. A flow structure is provided on the side wall of the one-way valve seat. When the one-way valve core opens the balance hole, the balance hole communicates with the piston cavity through the flow structure.

[0012] Furthermore, the one-way valve seat has a limiting section, which is located on the side of the one-way valve seat away from the piston plate. The limiting section is used to restrict the movement of the one-way valve core away from the piston plate.

[0013] Furthermore, multiple flow grooves are arranged in annular intervals on the side wall of the one-way valve seat near the limiting section, forming a flow structure.

[0014] Furthermore, the piston plate also has a one-way valve port, which is connected to the balance hole. The one-way valve port is located on the side of the balance hole closer to the piston chamber. The one-way valve port includes a tapered hole, the inner diameter of which gradually increases in the direction away from the balance hole.

[0015] Furthermore, the piston also includes a sealing gasket, which is sealed to the valve port. The end of the piston facing the corresponding valve port has a mounting boss, and the sealing gasket is fitted onto the mounting boss. A fixing structure is provided between the mounting boss and the sealing gasket to fix the sealing gasket. The mounting boss has a through hole, one end of which is connected to the balance hole.

[0016] Furthermore, the one-way valve seat and piston are integrally formed.

[0017] By applying the technical solution of this application, the solenoid valve allows two pistons to move simultaneously relative to the two valve ports during valve opening and closing. When fluid flows bidirectionally along the two connecting pipes, one of the pistons will move in the same direction as the fluid flow, thus ensuring the opening speed and sealing performance during valve closing. By setting a balancing structure at the ends where the two pistons mate with the valve ports, the balancing structure can be placed closer to the valve ports and connecting pipes. This allows one of the balancing structures to be closer to the high-pressure zone, enabling the high-pressure fluid to enter the piston chamber more quickly. This allows the pressure in the piston chamber to rise rapidly during valve closing, improving the piston's response speed and enabling the solenoid valve to close more quickly, ensuring the effective operation of the solenoid valve. Attached Figure Description

[0018] 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:

[0019] Figure 1 shows a schematic diagram of the structure of a solenoid valve in the closed state according to an embodiment of this application;

[0020] Figure 2 shows a schematic diagram of the structure of a solenoid valve in the open state according to an embodiment of this application;

[0021] Figure 3 shows a schematic diagram of the piston provided in one embodiment of this application;

[0022] Figure 4 shows a magnified view of a portion of point A in Figure 3;

[0023] Figure 5 shows a schematic diagram of the piston and gasket assembly provided in one embodiment of this application;

[0024] Figure 6 shows a schematic diagram of the structure of a solenoid valve in the closed state according to an embodiment of this application;

[0025] Figure 7 shows a schematic diagram of the structure of a solenoid valve in the open state according to an embodiment of this application;

[0026] Figure 8 shows a schematic diagram of the assembly of a piston and a one-way valve assembly according to an embodiment of this application;

[0027] Figure 9 shows a schematic diagram of the structure of a piston provided in one embodiment of this application;

[0028] Figure 10 shows a schematic diagram of the structure of a one-way valve assembly provided in an embodiment of this application;

[0029] Figure 11 shows a schematic diagram of the assembly of a piston and a one-way valve assembly according to an embodiment of this application;

[0030] Figure 12 shows a schematic diagram of the structure of a piston provided in one embodiment of this application;

[0031] Figure 13 shows a schematic diagram of a one-way valve assembly provided in an embodiment of this application;

[0032] Figure 14 shows a schematic diagram of another one-way valve assembly provided in one embodiment of this application.

[0033] 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; 111, first valve port; 112, second valve port; 200, Piston assembly; 201, Piston chamber; 210, First piston; 220, Second piston; 230, Piston sleeve; 240, Balance hole; 250, One-way valve assembly; 251, One-way valve seat; 2511, One-way valve port; 2512, Connecting boss; 2513, Flow hole; 2514, Limiting section; 2515, Flow groove; 252, One-way valve core; 260, Piston cylinder; 270, Piston plate; 271, Connecting hole; 272, Through hole; 2711, Straight hole; 2712, Tapered hole; 280, Sealing gasket; 281, Pad; 290, Mounting boss; 291, Through hole; 300, Pilot valve assembly; 301, Pilot valve chamber; 310, Pilot valve seat; 320, Sleeve; 330, First one-way valve; 340, Second one-way valve. Detailed Implementation

[0034] 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.

[0035] As shown in Figure 1, this embodiment of the application provides a solenoid valve, which includes a valve body assembly 100 and a piston assembly 200. The valve body assembly 100 has a flow chamber 101, with two valve ports respectively disposed at opposite ends along its extending direction. Both valve ports are connected to a connecting pipe. The piston assembly 200 is disposed within the flow chamber 101 and includes a piston sleeve 230 and two pistons. The two pistons are arranged along the extending direction of the flow chamber 101, forming a piston cavity 201 between the piston sleeve 230 and the two pistons. Each piston corresponds to one of the two valve ports, and the pistons can move relative to the piston sleeve 230 to block or open the corresponding valve port. A balancing structure is provided on the ends of the two pistons that mate with the valve ports, and the connecting pipe can communicate with the piston cavity 201 through the balancing structure.

[0036] By applying the technical solution of this application, the solenoid valve can have two pistons moving simultaneously relative to two valve ports when closing the valve. When the fluid flows bidirectionally along the two connecting pipes, one of the two pistons will be in the same direction as the fluid flow, thus ensuring the opening speed and sealing performance when closing the valve. By setting a balancing structure at the ends where the two pistons mate with the valve ports, the balancing structure can be placed closer to the valve ports and connecting pipes. This allows one of the balancing structures to be closer to the high-pressure zone, enabling the high-pressure fluid to enter the piston chamber 201 more quickly. This allows the pressure in the piston chamber 201 to rise rapidly when closing the valve, improving the piston's response speed and enabling the solenoid valve to close more quickly, ensuring the effective use of the solenoid valve.

[0037] Referring to Figures 3 to 5, the balancing structure includes a balancing hole 240, which is located at the end of the piston. The balancing hole 240 allows the piston chamber 201 to communicate with the outside world, and fluid can enter the piston chamber 201 through the balancing hole 240.

[0038] Preferably, the balance hole 240 can be coaxially arranged with the flow cavity 101 to improve the smoothness of fluid flow.

[0039] In this application, the flow area of ​​the valve port is S1, and the flow area of ​​the balance hole 240 is S2, where 0.1 ≤ S2 / S1 ≤ 0.2. When S2 / S1 is greater than 0.2, the flow area of ​​the balance hole 240 is too large. When the solenoid valve is open, the flow with the fluid will increase, leading to more high-pressure fluid entering the piston chamber 201, potentially causing piston movement. When S2 / S1 is less than 0.1, the flow area of ​​the balance hole 240 is too small. When the valve is closed, the flow performance is poor, hindering the rapid entry of high-pressure fluid into the piston chamber 201 and affecting the closing speed of the solenoid valve. Specifically, this application ensures that the flow rate of fluid entering the piston chamber 201 is suitable by setting 0.1 ≤ S2 / S1 ≤ 0.2, without affecting the normal operation of the piston. Specifically, S2 / S1 can be set to 0.1, 0.15, or 0.2.

[0040] Furthermore, the balancing structure also includes a one-way valve assembly 250, which is disposed at the balancing orifice 240 and unidirectionally flows from the connecting pipe towards the piston chamber 201. This configuration restricts the flow direction of fluid through the piston at the balancing orifice 240, preventing fluid leakage into the piston chamber 201 towards lower pressure and ensuring the effective opening and closing of the solenoid valve.

[0041] Specifically, the piston includes a piston cylinder 260 and a piston plate 270 connected to each other. The piston plate 270 is disposed at the end of the piston cylinder 260 and has a balance hole 240. The one-way valve assembly 250 includes a one-way valve seat 251 and a one-way valve core 252. The one-way valve seat 251 is disposed on the side of the piston plate 270 near the piston chamber 201. The one-way valve core 252 is movably disposed in the one-way valve seat 251 and is used to block or open the balance hole 240. A flow structure is provided on the side wall of the one-way valve seat 251. When the one-way valve core 252 opens the balance hole 240, the balance hole 240 communicates with the piston chamber 201 through the flow structure. With this configuration, when fluid enters the one-way valve seat 251 through the balance hole 240, it can push the one-way valve core 252 to move away from the balance hole 240, so that the flow structure is connected to the balance hole 240, thereby realizing the connection between the piston chamber 201 and the flow chamber 101.

[0042] In some feasible embodiments of this application, the one-way valve seat 251 has a limiting section 2514, the inner diameter of which gradually decreases in the direction away from the balance hole 240. The limiting section 2514 is disposed on the side of the one-way valve seat 251 away from the piston plate 270 to limit the movement of the one-way valve core 252 away from the piston plate 270.

[0043] Furthermore, a plurality of flow grooves 2515 are provided annularly at intervals on the side wall of the one-way valve seat 251 near the limiting section 2514, forming a flow structure. By setting the flow structure as a groove-shaped structure, it is easier to process the one-way valve seat 251 and reduce the processing difficulty. In other embodiments of this application, the flow structure can also be set as a hole-shaped structure, etc., as long as the flow effect can be achieved.

[0044] Specifically, the limiting section 2514 can be formed by directly riveting the side wall of the one-way valve seat 251, that is, the side wall of the one-way valve seat 251 is pressed towards the central axis, causing the one-way valve seat 251 to deform, and then riveting to form the limiting section 2514.

[0045] Furthermore, the piston plate 270 also has a one-way valve port 2511, which communicates with the balance hole 240. The one-way valve port 2511 is located on the side of the balance hole 240 closer to the piston chamber 201. With the above arrangement, the balance hole 240 can be blocked or opened by the cooperation of the one-way valve port 2511 and the one-way valve core 252. In this way, the one-way valve port 2511 and the one-way valve core 252 can be set to standard size, without the need to adjust the size of the one-way valve core 252 according to the diameter of the balance hole 240, thus improving the standardization of solenoid valve parts. As shown in Figure 4, the one-way valve port 2511 has a straight hole 2711 and a tapered hole 2712 that are interconnected. The tapered hole 2712 is located on the side of the straight hole 2711 away from the balance hole 240. The inner diameter of the tapered hole 2712 gradually increases in the direction away from the balance hole 240 to improve the compatibility between the one-way valve core 252 and the one-way valve port 2511 and improve the sealing performance at the one-way valve port 2511.

[0046] Specifically, the piston also includes a sealing gasket 280, which seals against the valve port. By setting the sealing gasket 280, a soft seal can be formed between the piston and the valve port. The sealing gasket 280 can fill the gap between the piston and the valve port by deformation, improving the sealing performance of the solenoid valve when closed. The end of the piston facing the corresponding valve port has a mounting boss 290. The sealing gasket 280 is fitted onto the mounting boss 290. A fixing structure is provided between the mounting boss 290 and the sealing gasket 280. The fixing structure is used to fix the sealing gasket 280 to ensure the stability of the installation of the sealing gasket 280, prevent the sealing gasket 280 from moving, and ensure that the sealing gasket 280 can stably seal with the valve port.

[0047] Specifically, the fixing structure may include a pad 281, which is disposed on the side of the sealing gasket 280 away from the piston plate 270. The mounting boss 290 fixes the pad 281 and the sealing gasket 280 by riveting. That is, the side wall of the mounting boss 290 is pressed away from the central axis, causing the mounting boss 290 to deform, thereby fixing the pad 281 and the sealing gasket 280.

[0048] Furthermore, the mounting boss 290 has a through hole 291, one end of which communicates with the balance hole 240, so that fluid can enter the balance hole 240 through the mounting boss 290.

[0049] In one specific embodiment of this application, the one-way valve seat 251 is integrally formed with the piston. This arrangement can ensure the stability of the installation of the one-way valve seat 251 and reduce the installation error of the one-way valve seat 251.

[0050] Referring specifically to Figures 1 and 2, the two valve ports provided in this application are a first valve port 111 and a second valve port 112 arranged opposite to each other. The first valve port 111 and the second valve port 112 are arranged opposite to each other on both sides of the flow cavity 101. The connecting pipe includes a first connecting pipe 01 and a second connecting pipe 02. The first connecting pipe 01 is located at the first valve port 111 and communicates with the first valve port 111. The second connecting pipe 02 is located at the second valve port 112 and communicates with the second valve port 112.

[0051] The two pistons are designated as a first piston 210 and a second piston 220. The first piston 210 is positioned corresponding to the first valve port 111, and the second piston 220 is positioned corresponding to the second valve port 112. 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 chamber 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 chamber 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.

[0052] 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.

[0053] Furthermore, the solenoid valve also includes a pilot valve assembly 300, which has a pilot valve seat 310 and a sleeve 320. A pilot valve cavity 301 is formed between the pilot valve seat 310 and the sleeve 320. The pilot valve seat 310 is disposed on the valve body assembly 100, and the pilot valve cavity 301 can communicate with the piston cavity 201 through the pilot valve seat 310. The pilot valve seat 310 is also provided with a first one-way valve 330 and a second one-way valve 340. The first one-way valve 330 is unidirectionally blocked from the pilot valve cavity 301 by the first connecting pipe 01 and unidirectionally openable from the pilot valve cavity 301 to the first connecting pipe 01. The second one-way valve 340 is unidirectionally blocked from the pilot valve cavity 301 by the second connecting pipe 02 and unidirectionally openable from the pilot valve cavity 301 to the second connecting pipe 02. Specifically, when the first one-way valve 330 is in a one-way open state, the second one-way valve 340 is in a one-way closed state; when the first one-way valve 330 is in a one-way closed state, the second one-way valve 340 is in a one-way open state. 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.

[0054] Specifically, the pilot valve assembly 300 has an open state and a closed state that are set relative to each other. When the pilot valve assembly 300 is in the open state, the pilot valve chamber 301 can be connected to one of the first connecting pipe 01 or the second connecting pipe 02. When the pilot valve assembly 300 is in the closed state, neither the first connecting pipe 01 nor the second connecting pipe 02 is connected to the pilot valve chamber 301.

[0055] 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:

[0056] 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 fluid in the piston chamber 201 enters the low-pressure side of the second connector 02 through the pilot valve chamber 301. 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 is subjected to pressure from the first connector 01. The pressure is greater than the elastic force of the piston chamber 201 and the elastic element. The first piston 210 moves away from the first valve port 111, the first valve port 111 opens, 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 assembly 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.

[0057] 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 fluid in the piston chamber 201 enters the first connector 01 on the low-pressure side through the pilot valve chamber 301. 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 is subjected to pressure from... The pressure in the second connector 02 is greater than the elastic force of the piston chamber 201 and 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 and enters 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. The first piston 210 can move away from the first valve port 111 under the drive of the pressure difference. The piston assembly 200 switches to the conducting state, and the fluid can flow from the second connector 02 to the first connector 01 through the flow chamber 101.

[0058] 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:

[0059] 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 first piston 210 or the second piston 220, increasing the pressure in the piston chamber 201. The pressure of the piston chamber 201 on the first piston 210 and the second piston 220 is combined with the elastic element to apply pressure to the first piston 210 and the second piston 220, 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 assembly 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.

[0060] As shown in Figures 6 and 7, the solenoid valve further includes a one-way valve assembly 250, which is separately disposed from the piston assembly 200 and fixed at the end of the piston facing the corresponding valve port. The one-way valve assembly 250 has a balance hole 240, and the two ends of the balance hole 240 are respectively connected to the corresponding connecting pipe and the piston chamber 201. The one-way valve assembly 250 can block or open the balance hole 240. The one-way valve assembly 250 is configured to conduct unidirectionally from the connecting pipe to the piston chamber 201.

[0061] Applying the technical solution of this application, the fluid in the flow chamber 101 can enter the piston chamber 201 through the balance hole 240 and the one-way valve assembly 250 to adjust the pressure in the piston chamber 201. Furthermore, by setting the one-way valve assembly 250, the flow direction of the fluid can be controlled, preventing fluid leakage in the piston chamber 201 and preventing solenoid valve seal failure. Specifically, this application also sets the one-way valve assembly 250 as a separate structure connected to the piston. This allows for the separate machining of the piston and the one-way valve assembly 250 before assembly, simplifying the piston's complexity. It also reduces the machining difficulty of the balance hole 240 and other unidirectional flow structures on the one-way valve assembly 250, improving overall production efficiency and reducing the machining cost of the solenoid valve.

[0062] Specifically, the balance hole 240 is coaxially arranged with the valve port. This arrangement allows the balance hole 240 to face the valve port, so that the fluid at the valve port can flow into the balance hole 240, ensuring the fluid flow rate at the balance hole 240.

[0063] Specifically, in this application, there are two valve ports: a first valve port 111 and a second valve port 112. 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. There are also two pistons: a first piston 210 and a second piston 220. The first piston 210 is positioned corresponding to the first valve port 111, and the second piston 220 is positioned corresponding to the second valve port 112. With this configuration, the solenoid valve can have two pistons moving simultaneously relative to the first valve port 111 and the second valve port 112 when closing. When fluid flows bidirectionally along the two connecting pipes, one of the first piston 210 and the second piston 220 will be in the same direction as the fluid flow, thus ensuring the opening speed and sealing performance when closing the valve. Simultaneously, both the first piston 210 and the second piston 220 have a one-way valve assembly 250 at their ends, allowing the balance hole 240 to be closer to one end of the first connecting pipe 01 or the second connecting pipe 02, enabling the high-pressure fluid to enter the piston chamber 201 more quickly, thereby improving the response speed of the solenoid valve.

[0064] Specifically, the piston sleeve 230 can be fitted over the outside of the first piston 210 and the second piston 220, or the first piston 210 and the second piston 220 can be fitted over the outside of the piston sleeve 230, as long as the piston and the piston sleeve can be movably connected.

[0065] Furthermore, 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.

[0066] 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.

[0067] Specifically, the one-way valve assembly 250 includes a one-way valve seat 251 and a one-way valve core 252. The one-way valve seat 251 has a one-way valve port 2511, which communicates with the balance hole 240. The one-way valve core 252 is movably disposed within the one-way valve seat 251 to block or open the one-way valve port 2511. Through this arrangement, the balance hole 240 can be blocked or opened by the cooperation of the one-way valve port 2511 and the one-way valve core 252. This allows the one-way valve port 2511 and the one-way valve core 252 to be set to standard dimensions, eliminating the need to adjust the size of the one-way valve core 252 according to the diameter of the balance hole 240, thus improving the standardization of solenoid valve components.

[0068] Specifically, a flow structure is provided on the side wall of the one-way valve seat 251. When the one-way valve core 252 opens the one-way valve port 2511, the one-way valve port 2511 communicates with the flow structure to connect the piston chamber 201 and the flow chamber 101. The flow structure can be configured as a perforated structure or a grooved structure to facilitate fluid flow. Preferably, it can be configured as a perforated structure to improve the structural strength of the one-way valve seat 251.

[0069] In this application, a connecting boss 2512 is annularly provided on the outer side wall of the one-way valve seat 251. The piston includes a piston cylinder 260 and a piston plate 270 connected to each other. The piston plate 270 is located at one end of the piston cylinder 260, and a connecting hole 271 is provided on the end face of the piston plate 270 facing the piston cylinder 260. The connecting boss 2512 is located in the connecting hole 271. This arrangement provides a positioning base for the one-way valve seat 251, and the connecting hole 271 can also restrict the movement of the one-way valve seat 251, ensuring the stability of the one-way valve seat 251 during installation.

[0070] Furthermore, the end face of the connecting boss 2512 is coplanar with the end face of the piston plate 270 facing the piston sleeve 230. The end face of the connecting boss 2512 and the end face of the piston plate 270 facing the piston sleeve 230 are laser welded together to stabilize the connection strength between the one-way valve assembly 250 and the piston. At the same time, the coplanarity of the end face of the connecting boss 2512 and the end face of the piston plate 270 facing the piston sleeve 230 can also provide a welding base for the connecting boss 2512 and the piston plate 270, which facilitates welding.

[0071] In this application, the piston also includes a sealing gasket 280, which seals against the valve port. The piston assembly 200 has a mounting boss 290 at the end facing the corresponding valve port. The sealing gasket 280 is fitted onto the mounting boss 290 and is fixedly connected to the piston via the mounting boss 290. By providing the sealing gasket 280, a soft seal can be formed between the piston and the valve port. The sealing gasket 280 can fill the gap between the piston and the valve port through deformation, improving the sealing performance of the solenoid valve when closed.

[0072] Specifically, the mounting boss 290 has a through hole 291, one end of which communicates with the balance hole 240 so that fluid can enter the balance hole 240 through the mounting boss 290.

[0073] Referring to Figures 8 to 10, the mounting boss 290 and the one-way valve assembly 250 are integrally formed. Specifically, the mounting boss 290 and the one-way valve seat 251 are integrally formed. A through hole 272 is provided on the piston plate 270, and the through hole 272 and the connecting hole 271 are coaxially arranged. The mounting boss 290 passes through the through hole 272. This arrangement facilitates the machining of the balance hole 240 and the through hole 291, allowing the through hole 291 and the balance hole 240 to use the same positioning base during machining, ensuring that the balance hole 240 and the through hole 291 are as coaxial as possible, and guaranteeing the fluid flow capacity.

[0074] Referring to Figures 11 to 14, the mounting boss 290 is integrally formed with the piston; specifically, the mounting boss 290 and the piston plate 270 are integrally formed. With this configuration, the one-way valve assembly 250 and the piston are separate structures. Because the diameter of the balance hole 240 is relatively small, separate machining of the one-way valve assembly 250 and the piston avoids the tool passing through the through hole 291 to machine the balance hole 240, reducing the machining difficulty of the balance hole 240 and ensuring its machining accuracy.

[0075] Furthermore, the balance hole 240 is disposed on the end face of the one-way valve seat 251. This arrangement facilitates the tool to directly machine the end face of the one-way valve seat 251 to form the balance hole 240, avoiding deep penetration into the one-way valve seat 251, reducing dimensional deviations and tool wear caused by tool runout, improving machining efficiency, and further reducing the machining difficulty of the balance hole 240.

[0076] Referring to Figure 13, a one-way valve assembly 250 is provided, wherein the one-way valve port 2511 of the one-way valve assembly 250 is a straight hole to facilitate machining and forming. This application also provides a one-way valve assembly 250, wherein the one-way valve port 2511 of the one-way valve assembly 250 is a tapered hole, and the inner diameter of the tapered hole gradually increases along the direction away from the balance hole 240 to accommodate the one-way valve core 252 and improve the sealing performance of the one-way valve assembly 250.

[0077] In some feasible embodiments of this application, a pad 281 is also fitted on the mounting boss 290, and a sealing gasket 280 is disposed between the pad and the piston plate 270. The mounting boss 290 fixes the pad 281 and the sealing gasket 280 by riveting, which is used to fix the sealing gasket 280, so as to ensure the stability of the installation of the sealing gasket 280, prevent the sealing gasket 280 from moving, and ensure that the sealing gasket 280 can be stably sealed with the valve port.

[0078] Specifically, in this application, the flow structure includes multiple flow holes 2513, which are arranged annularly at intervals on the side wall of the one-way valve seat 251. This arrangement allows fluid to flow through the flow holes 2513. Furthermore, compared to the flow groove arrangement in existing technologies, the annular arrangement of the flow holes 2513 on the side wall of the one-way valve seat 251 helps to maintain the structural strength of the one-way valve seat 251, reduces deformation during processing, and ensures a good fit between the one-way valve seat 251 and the one-way valve core 252.

[0079] In some embodiments, the diameter at the minimum point of the cross-section of the balance hole 240 is less than or equal to 1 mm. When the diameter of the balance hole 240 is greater than 1 mm, the diameter of the balance hole 240 is too large. When the solenoid valve is in the closed state, the fluid enters the piston chamber 201 at an excessively high speed, and the pressure inside the piston chamber 201 cannot be maintained within a small range, which can easily cause the solenoid valve to fail to close. Specifically, the diameter of the balance hole 240 can be selected as 0.5 mm, 0.7 mm, 0.8 mm, or 1 mm.

[0080] 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.

[0081] Furthermore, the solenoid valve also includes a pilot valve assembly 300, which has a pilot valve seat 310 and a sleeve 320. A pilot valve cavity 301 is formed between the pilot valve seat 310 and the sleeve 320. The pilot valve seat 310 is disposed on the valve body assembly 100, and the pilot valve cavity 301 can communicate with the piston cavity 201 through the pilot valve seat 310. The pilot valve seat 310 is also provided with a first one-way valve 330 and a second one-way valve 340. The first one-way valve 330 is unidirectionally blocked from the pilot valve cavity 301 by the first connecting pipe 01 and unidirectionally openable from the pilot valve cavity 301 to the first connecting pipe 01. The second one-way valve 340 is unidirectionally blocked from the pilot valve cavity 301 by the second connecting pipe 02 and unidirectionally openable from the pilot valve cavity 301 to the second connecting pipe 02. Specifically, when the first one-way valve 330 is in a one-way open state, the second one-way valve 340 is in a one-way closed state; when the first one-way valve 330 is in a one-way closed state, the second one-way valve 340 is in a one-way open state. 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.

[0082] Specifically, the pilot valve assembly 300 has an open state and a closed state that are set relative to each other. When the pilot valve assembly 300 is in the open state, the pilot valve chamber 301 can be connected to one of the first connecting pipe 01 or the second connecting pipe 02. When the pilot valve assembly 300 is in the closed state, neither the first connecting pipe 01 nor the second connecting pipe 02 is connected to the pilot valve chamber 301.

[0083] This application also provides a method for manufacturing a solenoid valve, wherein the solenoid valve is the aforementioned solenoid valve. The manufacturing method includes: Step 1: machining a balance hole 240 on the check valve assembly 250; Step 2: assembling the check valve assembly 250 and the piston assembly 200. This configuration, by machining a balance hole on the separate check valve assembly 250 before assembling the check valve assembly 250 and the piston assembly 200, simplifies the piston's complexity and reduces the machining difficulty of the balance hole 240 and other unidirectional conduction structures on the check valve assembly 250, thereby improving overall production efficiency and reducing the manufacturing cost of the solenoid valve.

[0084] Specifically, the end of the one-way valve seat 251 facing the piston chamber 201 has a limiting section 2514. The inner diameter of the limiting section 2514 gradually decreases along the direction towards the piston chamber 201. The limiting section 2514 is riveted to the side wall of the one-way valve seat 251 under external pressure to deform in the direction of the central axis, thereby restricting the movement of the one-way valve core 252. In some embodiments of this application, when assembling the one-way valve assembly 250 and the piston, the mounting boss 290 needs to be inserted into the through hole 272 first, and the boss 2512 and the piston plate 270 are welded together. Then, the one-way valve core 252 is placed into the one-way valve seat 251, and the limiting section 2514 is machined. Then, the sealing gasket 280 is sleeved on the mounting boss 290, and the side wall of the mounting boss 290 is riveted to deform the side wall of the mounting boss 290, thereby fixing the mounting boss 290 and the sealing gasket 280. Thus, when welding the connecting boss 2512 and the piston plate 270, the heat from welding will not cause thermal deformation of the one-way valve core 252. This design increases the load-bearing area of ​​the one-way valve assembly 250 during assembly, improves riveting strength, and prevents the one-way valve core 252 from falling off after reciprocating impacts.

[0085] Furthermore, before riveting and fixing the mounting boss 290 and the sealing gasket 280, a tooling needs to be set up to support the check valve on the side of the connecting boss 2512 away from the mounting boss 290. This setting can reduce the risk of the welded connection between the connecting boss 2512 and the piston detaching when riveting the mounting boss 290, and ensure the stability of the check valve assembly 250 installation.

[0086] In some embodiments of this application, the mounting boss 290 is integrally formed with the piston. When assembling the one-way valve assembly 250 and the piston, the sealing gasket 280 needs to be first fitted onto the mounting boss 290. After riveting and fixing the mounting boss 290 and the sealing gasket 280, the connecting boss 2512 is inserted into the through hole 272, and the connecting boss 2512 is welded to the piston plate 270. Then, the one-way valve core 252 is placed into the one-way valve seat 251, and the limiting section 2514 is machined. This arrangement can avoid the riveting force being transmitted to the one-way valve assembly 250 when riveting the mounting boss 290, which could cause hidden damage such as deformation or cracks in the one-way valve seat 251 or the one-way valve core 252 of the one-way valve assembly 250. This ensures the performance of the one-way valve assembly 250 during use and improves its service life.

[0087] 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: The valve body assembly (100) has a flow cavity (101), and two valve ports are respectively provided at both ends of the flow cavity (101) that are arranged opposite to each other along the extension direction, and both valve ports are connected to a pipe. A piston assembly (200) is disposed in the flow chamber (101). The piston assembly (200) includes a piston sleeve (230) and two pistons. The two pistons are arranged along the extension direction of the flow chamber (101). A piston chamber (201) is formed between the piston sleeve (230) and the two pistons. The two pistons correspond to two valve ports respectively. The pistons can move relative to the piston sleeve (230) to block or open the corresponding valve ports. The two pistons are provided with a balancing structure at their ends that mate with the valve port, and the connecting pipe can communicate with the piston chamber (201) through the balancing structure.

2. The solenoid valve according to claim 1, characterized in that, The balancing structure includes a balancing hole (240) disposed at the end of the piston.

3. The solenoid valve according to claim 2, characterized in that, The flow area of ​​the valve port is S1, and the flow area of ​​the balance hole (240) is S2, where 0.1 ≤ S2 / S1 ≤ 0.

2.

4. The solenoid valve according to claim 2, characterized in that, The balance hole (240) is coaxially arranged with the flow chamber (101). The balance structure also includes a one-way valve assembly (250), which is located at the balance hole (240) and is unidirectionally connected to the piston chamber (201) via the connecting pipe.

5. The solenoid valve according to claim 4, characterized in that, The piston includes a piston cylinder (260) and a piston plate (270) connected to each other. The piston plate (270) is disposed at the end of the piston cylinder (260). The piston plate (270) is provided with the balance hole (240). The one-way valve assembly (250) includes a one-way valve seat (251) and a one-way valve core (252). The one-way valve seat (251) is disposed on the side of the piston plate (270) near the piston chamber (201). The one-way valve core (252) is movably disposed in the one-way valve seat (251). The one-way valve core (252) is used to block or open the balance hole (240). The side wall of the one-way valve seat (251) is provided with a flow structure. When the one-way valve core (252) opens the balance hole (240), the balance hole (240) communicates with the piston chamber (201) through the flow structure.

6. The solenoid valve according to claim 5, characterized in that, The one-way valve seat (251) has a limiting section (2514) which is disposed on the side of the one-way valve seat (251) away from the piston plate (270). The limiting section (2514) is used to restrict the movement of the one-way valve core (252) away from the piston plate (270).

7. The solenoid valve according to claim 6, characterized in that, The one-way valve seat (251) has a plurality of flow grooves (2515) arranged in annular intervals on the side wall near the limiting section (2514), and the flow grooves (2515) form the flow structure.

8. The solenoid valve according to claim 5, characterized in that, The piston plate (270) also has a one-way valve port (2511), which communicates with the balance hole (240). The one-way valve port (2511) is located on the side of the balance hole (240) near the piston chamber (201). The one-way valve port (2511) includes a tapered hole (2712), and the inner diameter of the tapered hole (2712) gradually increases in the direction away from the balance hole (240).

9. The solenoid valve according to claim 2, characterized in that, The piston also includes a sealing gasket (280), which is sealed to the valve port. The piston has a mounting boss (290) at one end facing the corresponding valve port. The sealing gasket (280) is fitted onto the mounting boss (290). A fixing structure is provided between the mounting boss (290) and the sealing gasket (280) for fixing the sealing gasket (280). The mounting boss (290) has a through hole (291), one end of which is connected to the balance hole (240).

10. The solenoid valve according to claim 1, characterized in that, The solenoid valve also includes: A one-way valve assembly (250) is separately disposed from the piston assembly (200) and fixed at the end of the piston facing the corresponding valve port. The one-way valve assembly (250) has a balance hole (240), and the two ends of the balance hole (240) are respectively connected to the corresponding connecting pipe and the piston chamber (201). The one-way valve assembly (250) can block or open the balance hole (240). The one-way valve assembly (250) is configured to conduct unidirectionally from the connecting pipe to the piston chamber (201).

11. The solenoid valve according to claim 10, characterized in that, The one-way valve assembly (250) includes a one-way valve seat (251) and a one-way valve core (252). The one-way valve seat (251) has a one-way valve port (2511) which communicates with the balance hole (240). The one-way valve core (252) is movably disposed in the one-way valve seat (251) to block or open the one-way valve port (2511). A flow structure is provided on the side wall of the one-way valve seat (251). When the one-way valve core (252) opens the one-way valve port (2511), the one-way valve port (2511) communicates with the flow structure.

12. The solenoid valve according to claim 11, characterized in that, The one-way valve seat (251) has a connecting boss (2512) arranged in a ring on the outer side wall. The piston includes a piston cylinder (260) and a piston plate (270) connected to each other. The piston plate (270) is disposed at one end of the piston cylinder (260). A connecting hole (271) is provided on the end face of the piston plate (270) facing the piston cylinder (260). The connecting boss (2512) is disposed in the connecting hole (271).

13. The solenoid valve according to claim 12, characterized in that, The end face of the connecting boss (2512) is coplanar with the end face of the piston plate (270) facing the piston sleeve (230), and the end face of the connecting boss (2512) is laser welded to the end face of the piston plate (270) facing the piston sleeve (230).

14. The solenoid valve according to claim 10, characterized in that, The piston also includes a sealing gasket (280), which is sealed to the valve port. The piston assembly (200) has a mounting boss (290) on one end facing the corresponding valve port. The sealing gasket (280) is sleeved on the mounting boss (290) and is fixedly connected to the piston through the mounting boss (290).

15. The solenoid valve according to claim 14, characterized in that, The mounting boss (290) has a through hole (291), one end of which is connected to the balance hole (240); a pad is also fitted on the mounting boss (290), and the sealing gasket (280) is disposed between the pad and the end face of the piston facing the valve port.

16. The solenoid valve according to claim 14, characterized in that, The mounting boss (290) is integrally formed with the one-way valve assembly (250); or, the mounting boss (290) is integrally formed with the piston.

17. A method for manufacturing a solenoid valve, characterized in that, The solenoid valve is the solenoid valve according to any one of claims 10 to 16, and the processing method includes: Step 1: Machining the balance hole (240) on the one-way valve assembly (250); Step 2: Assemble the one-way valve assembly (250) and the piston assembly (200).

18. The processing method according to claim 17, characterized in that, The piston assembly (200) has a mounting boss (290) on one end facing the corresponding valve port. The mounting boss (290) is integrally formed with the one-way valve assembly (250). The one-way valve seat (251) has a limiting section (2514) on one end facing the piston cavity (201). The inner diameter of the limiting section (2514) gradually decreases in the direction towards the piston cavity (201). The limiting section (2514) is formed by riveting. Step two specifically includes: Insert the mounting boss (290) into the through hole (272), weld the boss (2512) and the piston plate (270) together, put the one-way valve core (252) into the one-way valve seat (251), and process the limiting section (2514). The sealing gasket (280) is fitted onto the mounting boss (290), and the mounting boss (290) and the sealing gasket (280) are riveted together.

19. The processing method according to claim 18, characterized in that, In step two, before riveting and fixing the mounting boss (290) and the sealing gasket (280), a tooling is set to support the one-way valve assembly (250) on the side of the connecting boss (2512) away from the mounting boss (290).

20. The processing method according to claim 18, characterized in that, The piston assembly (200) has a mounting boss (290) on one end facing the corresponding valve port. The mounting boss (290) is integrally formed with the piston. Step two specifically includes: The sealing gasket (280) is fitted onto the mounting boss (290), and the mounting boss (290) and the sealing gasket (280) are riveted together. Insert the connecting boss (2512) into the through hole (272), weld the connecting boss (2512) to the piston plate (270), place the one-way valve core (252) into the one-way valve seat (251), and process the limiting section (2514).

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