Solenoid valve

Abstract

The solenoid valve includes a valve core assembly (10), a valve seat (20) and a piston (30), the valve core assembly includes a valve cover (11) and a valve core (12), a part of the valve core is inserted into the valve cover, the valve seat has an opening (21), a receiving chamber (22) and a valve port (23), the opening and the valve port are respectively located at both ends of the receiving chamber and both the opening and the valve port are connected to the receiving chamber, the valve cover is located at the opening and connected to the valve seat, the piston is movably arranged in the receiving chamber and has an open position away from the valve port and a closed position sealing the valve port, the valve core is arranged corresponding to the piston and is used to control the movement of the piston between the open position and the closed position, the piston and the valve seat are clearance-fitted, and the inner wall of the valve seat is used to guide the piston. This solenoid valve can solve the problem of the large structural size of the solenoid valve in the prior art.

Description

[Technical field]

[0001] This application claims priority to a patent application filed with the China National Intellectual Property Office on March 25, 2022, bearing application number 202220699993.6 and entitled "Solenoid Valve." This application claims priority to a patent application filed with the China National Intellectual Property Office on March 25, 2022, bearing application number 202220700251.0 and entitled "Solenoid Valve". This application claims priority to a patent application filed with the State Intellectual Property Office of China on April 7, 2022, bearing application number 202220792900.4 and entitled "Solenoid Valve". This application claims priority to a patent application filed with the China National Intellectual Property Office on March 25, 2022, bearing application number 202220667851.1 and entitled "Solenoid Valve".

[0002] FIELD OF THE DISCLOSURE This application relates to the technical field of solenoid valves, and more particularly, to solenoid valves. [Background technology]

[0003] In the prior art, the solenoid valve includes a valve cover, a valve seat and a piston assembly, the valve cover is provided with a guide segment, the piston assembly is movably provided in the guide segment, and the outer wall of the valve cover is connected to the inner wall of the valve seat. However, this increases the structural size of the valve seat, and when it is inserted into the built-in module, it will occupy a larger installation space, and at the same time, the material consumption will increase, which will increase the manufacturing cost. Summary of the Invention

[0004] The present application provides a solenoid valve for solving the problem that the solenoid valve in the prior art has a large structural size.

[0005] The present application provides an electromagnetic valve, which includes a valve core assembly, a valve seat and a piston, the valve core assembly including a valve cover and a valve core, a part of the valve core is inserted into the valve cover, the valve seat has an opening, a receiving chamber and a valve port, the opening and the valve port are respectively located at both ends of the receiving chamber, and the opening and the valve port are both connected to the receiving chamber, the valve cover is located at the opening and connected to the valve seat, the piston is movably arranged in the receiving chamber, and has an open position away from the valve port and a sealed position sealing the valve port, the valve core is arranged corresponding to the piston and is used to control the movement of the piston between the open position and the sealed position, the piston and the valve seat are clearance fit, and the inner wall of the valve seat is used to guide the piston.

[0006] When the technical aspect of the present application is applied, the valve core is inserted into the valve cover, the valve cover is disposed in the opening of the valve seat and connected with the valve seat, the piston is movably disposed in the receiving chamber of the valve seat, the valve seat and the piston are clearance-fitted, the inner wall of the valve seat acts as a guide for the piston, and the valve core can control the movement of the piston between the open position and the closed position. In the prior art, a guide segment is usually provided on the valve cover to ensure the stability of the movement of the piston. However, with the above structure, the inner wall of the valve seat can guide the piston, so that the guide segment on the valve cover can be eliminated, and the structural dimensions of the valve seat can be reduced, the installation space occupied by the insert-fitted module can be reduced, and the material can be saved, which can reduce the processing cost of the solenoid valve.

[0007] Furthermore, there is a first limiting structure between the valve cover and the valve seat, the first limiting structure is used to limit the relative position of the valve cover and the valve seat, and when the valve cover is attached to the valve seat, the limiting structure can limit the valve cover to ensure an accurate connection between the valve cover and the valve seat.

[0008] Further, the valve cover has a first segment and a second segment arranged in a stepped shape, the diameter of the first segment of the valve cover is larger than the diameter of the second segment of the valve cover, the second segment of the valve cover is arranged close to the valve orifice, there is a first step surface between the first segment of the valve cover and the second segment of the valve cover, the valve seat has a first hole segment and a second hole segment arranged in a stepped shape, the diameter of the first hole segment of the valve seat is larger than the diameter of the second hole segment of the valve seat, there is a second step surface between the first hole segment of the valve seat and the second hole segment of the valve seat, the first step surface is engaged and limited by the second step surface to form a limiting structure. By using the above structure, the first step surface and the second step surface are simple in structure and easy to process and manufacture, while ensuring the limiting effect of the limiting structure.

[0009] In addition, the valve cover is screwed to the valve seat. By using screwing, the stability of the connection between the valve cover and the valve seat can be ensured, and the material requirements for the valve seat can be reduced to reduce the manufacturing cost. At the same time, the thread can be easily processed, so that the processing cost can be reduced.

[0010] The valve core assembly further includes a fixed core, a sleeve, a movable core, and a coil assembly, the fixed core is provided at one end of the valve cover away from the piston assembly and fixedly connected to the valve cover, the sleeve is provided at one end of the fixed core away from the valve port, at least a part of the fixed core is located within the sleeve, the movable core is movably provided within the sleeve and located at one end away from the valve port of the fixed core, one end of the valve core is connected to the movable core, the other end of the valve core is provided through the fixed core and corresponding to the piston, the coil assembly surrounds the outer periphery of the sleeve so as to drive the movable core to move the valve core and the piston toward the direction approaching the fixed core. The movable core is provided above the fixed core, and in the process of moving within the sleeve, the valve core can be moved to move within the fixed core, so that the valve core can drive the piston to move between the open position and the closed position.

[0011] Furthermore, the valve core has a connecting segment, a guide segment and an abutting segment, the connecting segment is movably arranged within the movable core, the guide segment is inserted into the fixed core, and the abutting segment is used to abut against the piston, and the valve core assembly further includes a first elastic member, the first elastic member is arranged within the movable core, and one end of the first elastic member close to the valve port abuts against the connecting segment. The valve core can reciprocate within the fixed core, and the first elastic member plays a buffering role for the valve core during the reciprocating motion of the valve core, and can prevent the valve core from being damaged during the movement of the valve core.

[0012] Furthermore, the valve core assembly further includes a second elastic member, which is disposed between the movable core and the fixed core and can provide an elastic force to the movable core so that the movable core moves in a direction away from the fixed core. During the process of energizing the coil, the fixed core generates a magnetic force to drive the movable core to move toward the fixed core, and the movable core compresses the second elastic member, and after the coil is powered off, the second elastic member can drive the movable core in a compressed state to move in a direction away from the fixed core, thereby driving the movable core to return to its original position and putting the solenoid valve into a normally open state.

[0013] Furthermore, the valve cover and the fixed core are of an integrally molded structure, which makes it easy to process and manufacture the valve cover and the fixed core, and also makes it easy to remove and attach the valve cover and the fixed core.

[0014] In addition, the solenoid valve further includes a sealing ring, which is disposed between the second segment of the valve cover and the second hole segment of the valve cover, thereby restricting the valve cover and the valve seat and ensuring a tight seal between them to prevent the fluid from leaking at the connection point between the valve cover and the valve seat.

[0015] The valve core assembly further includes a sleeve, a fixed core, a movable core, and a coil assembly, the sleeve is fixedly connected to the valve cover, the fixed core is disposed within the sleeve, the movable core is movably disposed within the sleeve and is located at one end of the fixed core close to the valve port, one end of the valve core is connected to the movable core, and the other end of the valve core is disposed through the sleeve corresponding to the piston, and the coil assembly surrounds the outer periphery of the sleeve so as to drive the movable core to move the valve core and the piston toward the direction approaching the fixed core. The fixed core is disposed above the movable core and is disposed separately from the fixed core and the valve cover, and the movable core can reciprocate within the sleeve. In this way, the solenoid valve can be maintained in a normally closed state, and when the coil is energized, the solenoid valve can be opened. [Brief description of the drawings]

[0016] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and their explanations are intended to interpret the application and are not intended to unduly limit the application.

[0017] [Figure 1] 1 shows a structural schematic diagram of a solenoid valve provided in Example 1 of the present application. [Diagram 2] 2 shows an enlarged view of a portion A in FIG. [Diagram 3] 2 shows an enlarged view of a portion B in FIG. [Figure 4] 13 is a structural schematic diagram of a solenoid valve according to a second embodiment of the present application when the movable core is in an initial position; FIG. [Diagram 5] 5 is a schematic structural diagram of the solenoid valve of FIG. 4 when the movable core metal is in the engaged position. [Figure 6] FIG. 5 is a schematic diagram of the structure of the solenoid valve when the movable core metal of the solenoid valve in FIG. 4 is in the adsorption position. [Figure 7] 5 is a structural schematic diagram of the engagement between the valve core and the movable core of the solenoid valve of FIG. 4; [Figure 8] 5 is a structural schematic diagram of the engagement between the valve seat, valve cover and sleeve of the solenoid valve of FIG. 4. [Figure 9] 1 shows a structural schematic diagram of a solenoid valve provided in Example 3 of the present application. [Figure 10] 6 is a cross-sectional view of the solenoid valve of FIG. 5 after being connected to the seat body. [Figure 11] 6 is a structural schematic diagram of a fixing member in the solenoid valve of FIG. 5. [Figure 12] 1 shows a structural schematic diagram of a solenoid valve provided in Example 4 of the present application.

[0018] Here, the above drawings include the following reference numbers: 10 valve core assembly, 11 valve cover, 111 first step surface, 12 valve core, 121 connection segment, 122 guide segment, 123 abutment segment, 1231 abutment end, 124 first sub-segment, 1241 engagement segment, 1242 intermediate connection segment, 125 second sub-segment, 13 fixed core, 14 sleeve, 15 movable core, 151 third mounting hole, 152 magnetic part, 1521 assembly hole, 153 packing, 154 balancing hole, 155 fourth mounting hole, 156 communication hole, 16 coil assembly, 161 magnetic induction frame, 1611 first horizontal plate, 1612 vertical plate, 1613 second horizontal plate, 16131 third convex part, 16132 main plate, 16133 fourth convex part, 162 coil, 17 First elastic member, 18 second elastic member, 20 valve seat, 21 opening, 22 receiving chamber, 23 valve port, 24 second step surface, 30 piston, 31 first equalizing passage, 321 rivet pressing ring, 33 fourth step surface, 34 piston spring, 40 sealing ring, 50 gasket, 51 deformation avoidance portion, 52 through hole, 53 third step surface, 60 fixing member, 61 first protrusion, 611 first mounting hole, 62 plate body, 621 through hole, 63 second protrusion, 631 second mounting hole, 64 connection ring, 71 first fastening member, 72 second fastening member, 80 Seat body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are merely some of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is actually merely explanatory, and does not impose any restrictions on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0020] As shown in FIG. 1 to FIG. 3 , the first embodiment of the present application includes a valve core assembly 10, a valve seat 20 and a piston 30. The valve core assembly 10 includes a valve cover 11 and a valve core 12. A part of the valve core 12 is inserted into the valve cover 11. The valve seat 20 has an opening 21, a receiving chamber 22 and a valve port 23. The opening 21 and the valve port 23 are located at both ends of the receiving chamber 22, respectively, and the opening 21 and the valve port 23 are both connected to the receiving chamber 22. The valve cover 11 is located at the opening 21 and the valve seat 20 is connected to the receiving chamber 22. 0, a piston 30 is movably disposed within the accommodating chamber 22, the piston 30 has an open position away from the valve orifice 23 and a sealed position for sealing the valve orifice 23, a valve core 12 is disposed corresponding to the piston 30, and the valve core 12 is used to control the movement of the piston 30 between the open position and the sealed position, the piston 30 and the valve seat 20 are clearance-fitted, and the inner wall of the valve seat 20 provides an electromagnetic valve used to guide the piston 30.

[0021] When the technical aspect of the present application is applied, the valve core 12 is inserted into the valve cover 11, the valve cover 11 is disposed in the opening 21 of the valve seat 20 and connected to the valve seat 20, the piston 30 is movably disposed in the receiving chamber 22 of the valve seat 20, the valve seat 20 and the piston 30 are clearance-fitted, the inner wall of the valve seat 20 serves as a guide for the piston 30, and the valve core 12 can control the movement of the piston 30 between the open position and the closed position. In the prior art, a guide structure is usually provided on the valve cover 11 to ensure the stability of the movement of the piston 30. However, by using the above structure, the inner wall of the valve seat 20 can guide the piston 30, so that the guide structure on the valve cover 11 can be eliminated, and furthermore, the structural dimensions of the valve seat 20 can be reduced, the installation space occupied by the inserted and assembled module can be reduced, and the processing cost of the solenoid valve can be reduced by saving materials.

[0022] Here, there is a first limiting structure between the valve cover 11 and the valve seat 20, and the first limiting structure is used to limit the relative position between the valve cover 11 and the valve seat 20. When the valve cover 11 is attached to the valve seat 20, the first limiting structure can limit the valve cover 11 to ensure accurate connection between the valve cover 11 and the valve seat 20, and further ensure the normal operation of the solenoid valve.

[0023] As shown in FIG. 2 , the valve cover 11 has a first segment and a second segment arranged in a stepped shape, the diameter of the first segment of the valve cover 11 is larger than the diameter of the second segment of the valve cover 11, the second segment of the valve cover 11 is arranged close to the valve orifice 23, and a first step surface 111 is provided between the first segment of the valve cover 11 and the second segment of the valve cover 11, the valve seat 20 has a first hole segment and a second hole segment arranged in a stepped shape, the diameter of the first hole segment of the valve seat 20 is larger than the diameter of the second hole segment of the valve seat 20, and a second step surface 24 is provided between the first hole segment of the valve seat 20 and the second hole segment of the valve seat 20, and the first step surface 111 is engaged and limited by the second step surface 24 to form a first limiting structure. The valve cover 11 has a first step surface 111, and the valve seat 20 has a second step surface 24, and the first step surface 111 and the second step surface 24 engage with each other to restrict the valve seat 20 and the valve cover 11. By using the above structure, the first step surface 111 and the second step surface 24 have a simple structure, which makes processing and manufacturing easier, while at the same time ensuring the restricting effect of the restricting structure.

[0024] Specifically, the valve cover 11 and the valve seat 20 are screwed together. By using screwing, the stability of the connection between the valve cover 11 and the valve seat 20 can be ensured, and by using screwing, the material requirements for the valve seat 20 can be reduced, thereby reducing the manufacturing cost, and at the same time, since the thread is easy to process, the processing cost can be reduced.

[0025] The valve core assembly 10 further includes a fixed core 13, a sleeve 14, a movable core 15, and a coil assembly 16. The fixed core 13 is provided at one end of the valve cover 11 remote from the piston 30 assembly, and is fixedly connected to the valve cover 11. The sleeve 14 is provided at one end of the fixed core 13 remote from the valve port 23, and at least a part of the fixed core 13 is located within the sleeve 14. The movable core 15 is movably provided within the sleeve 14 and is located at one end of the fixed core 13 remote from the valve port 23, one end of the valve core 12 is connected to the movable core 15, and the other end of the valve core 12 passes through the fixed core 13 and is provided corresponding to the piston 30. The coil assembly 16 surrounds the outer periphery of the sleeve 14. The movable core 15 is provided above the fixed core 13, and in the process of moving the movable core 15 within the sleeve 14, the valve core 12 can be moved within the fixed core 13, so that the valve core 12 can drive the piston 30 to move between the open position and the closed position. In this way, the solenoid valve can be maintained in a normally open state, and when the coil is energized, the solenoid valve can be closed.

[0026] Specifically, the valve core 12 has a connecting segment 121, a guide segment 122 and an abutting segment 123, the connecting segment 121 is movably arranged in the movable iron core 15, the guide segment 122 is inserted into the fixed iron core 13, and the abutting segment 123 is used to abut against the piston 30, the valve core assembly 10 further includes a first elastic member 17, the first elastic member 17 is arranged in the movable iron core 15, one end of the first elastic member 17 close to the valve port 23 abuts against the connecting segment 121, and the other end of the first elastic member 17 is located at an end away from the valve port 23 of the valve core 12 and abuts against the top of the sleeve 14, specifically, in this application, a sealing head is provided on the top of the sleeve 14. The valve core 12 can reciprocate within the fixed iron core 13, and the first elastic member 17 acts as a buffer for the valve core 12 during the reciprocating motion of the valve core 12, thereby preventing the valve core 12 from being damaged during the movement.

[0027] Here, the valve core assembly 10 further includes a second elastic member 18, which is disposed between the movable core 15 and the fixed core 13, and the second elastic member 18 can provide an elastic force to the movable core 15 so that the movable core 15 moves in a direction away from the fixed core 13. During the process of energizing the coil, the fixed core 13 generates a magnetic force to drive the movable core 15 to move toward the fixed core 13, and the movable core 15 compresses the second elastic member 18. After the coil is powered off, the second elastic member 18 can drive the movable core 15 in a compressed state to move in a direction away from the fixed core 13, thereby driving the movable core 15 to return to its original position, and the solenoid valve can be normally open.

[0028] Specifically, as shown in Fig. 1, the valve cover 11 and the fixed core 13 in this embodiment are of an integrally molded structure. This makes it easy to process and manufacture the valve cover 11 and the fixed core 13, and makes it easy to remove and install the valve cover 11 and the fixed core 13. The solenoid valve further includes a sealing ring 40, which is disposed between the second segment of the valve cover 11 and the second hole segment of the valve seat 20. This restricts the valve cover 11 and the valve seat 20, while ensuring the sealing between them, and prevents fluid from leaking at the connection point between the valve cover 11 and the valve seat 20.

[0029] As shown in FIG. 3 , the valve core 12 has a contact end 1231, the piston 30 has a first balancing passage 31, the first balancing passage 31 passes through both ends of the piston 30 along the axial direction, the first end of the piston 30 is arranged corresponding to the valve port 23, the second end of the piston 30 is arranged corresponding to the valve core 12, and the second end of the piston 30 is arranged with a rivet pressing structure, and the solenoid valve further includes a gasket 50, the gasket 50 is arranged at the second end of the piston 30, and the rivet pressing structure is The gasket 50 is located outside the gasket 50 and is used to fix the gasket 50. The gasket 50 is provided with a deformation avoidance portion 51 and a through hole 52. The through hole 52 is connected to the first balancing passage 31. The deformation avoidance portion 51 is provided on the outer periphery of the through hole 52 and can provide space to accommodate deformation of the gasket 50. The abutment end 1231 is provided corresponding to the end of the through hole 52 away from the valve port 23, and has an abutment state in which it abuts against the gasket 50 and a separation state in which it is separated from the gasket 50.

[0030] When the technical aspects of the present application are applied, the valve seat 20 has an accommodating chamber 22 and a valve port 23, the valve core assembly 10 is movably arranged on the valve seat 20, the piston 30 is movably arranged within the accommodating chamber 22, a first end of the piston 30 is arranged corresponding to the valve port 23, a second end of the piston 30 is arranged corresponding to the valve core assembly 10, the gasket 50 is arranged at the second end within the piston 30 assembly, the second end of the piston 30 is provided with a rivet pressing structure for fixing the gasket 50, a deformation avoidance portion 51 is provided on the outer periphery of a through hole 52 in the gasket 50, and the through hole 52 is connected to a first balancing passage 31 provided in the piston 30. In this way, the deformation avoidance portion 51 can provide a rivet pressing margin, and when the rivet pressing structure fixes the gasket 50, the deformation avoidance portion 51 can generate more deformation, so that other portions of the gasket 50 can be prevented from being greatly deformed, and the gasket 50 and the second end of the piston 30 can be tightly attached to each other, so that the solenoid valve can be prevented from having internal leakage. The above design can also prevent deformation of the through hole 52, and can ensure the flow rate of the fluid passing through the through hole 52 and the first balancing passage 31, making it easier for the piston 30 to return to the balanced state, and can ensure the smoothness of the fluid flowing out of the valve port 23.

[0031] In this embodiment, the solenoid valve has a number of inlets, which are arranged on the side wall of the valve seat 20 surrounding the valve seat 20 and communicate with the receiving chamber 22, the piston 30 divides the receiving chamber 22 into an upper chamber and a lower chamber, the pilot valve port is located on the side of the through hole 52 facing the movable iron core 15, and when the pilot valve port is opened, the first balancing passage 31 can balance the pressure difference between the upper chamber and the lower chamber. Here, the valve core 12 is moved by moving the movable iron core 15, thereby realizing the sealing or opening of the pilot valve port, and further realizing the adjustment of the pressure difference between the upper chamber and the lower chamber of the piston 30, and adjusting the sealing or opening of the piston 30 to the valve port 23. When the valve core 12 and the piston 30 are in contact with each other, the valve core 12 can be subjected to the pressure difference, and when the pressure in the upper chamber is lower than that in the lower chamber, the valve core 12 and the piston 30 can move axially away from the valve port 23 and even open the valve port 23. When the valve core 12 and the piston 30 are separated, the inside of the receiving chamber 22 is equalized with the outside air pressure by the equalizing passage such as the first equalizing passage 31, and when the valve core 12 moves toward the valve port 23 in the pressure equilibrium state between the upper chamber and the lower chamber, the piston 30 is pressed and moved, and the valve port 23 is closed, so that the valve core 12 can move smoothly together with the movable iron core 15. After the valve port 23 is closed, due to the pressure difference between the inlet and the outlet, the piston 30 is pressed at the valve port 23, and the valve port 23 is difficult to open, so that the reliability of the valve closing is ensured.

[0032] The gasket 50 has a first end and a second end provided opposite to each other, the first end of the gasket 50 abuts against the piston 30, the rivet pressing structure is located on the outer periphery of the second end of the gasket 50, and the deformation avoidance portion 51 is provided at the second end of the gasket 50. By using the above structure, the rivet pressing structure is provided corresponding to the deformation avoidance portion 51, and it is possible to ensure that deformation of the gasket 50 occurs within the deformation avoidance portion 51 when the rivet is pressed.

[0033] Furthermore, the deformation avoidance part 51 includes an avoidance groove, which has a circular ring structure, and is coaxially arranged with the avoidance groove and the through hole 52. The avoidance groove has a continuous circular ring structure, which can further ensure that the deformation avoidance part 51 complements the rivet pressing margin, and the avoidance groove and the through hole 52 are coaxially arranged, which can ensure that the deformation of each part of the deformation avoidance part 51 is the same, thereby ensuring that the gasket 50 and the second end of the piston 30 are in close contact with each other, and thus preventing internal leakage from occurring in the solenoid valve.

[0034] As shown in FIG. 2, the gasket 50 has an inner wall and an outer wall. The distance between the inner wall and the outer wall is L, and the distance between the avoidance groove and the inner wall of the gasket 50 is L1. L1 is 1 / 4 to 3 / 4 of L. If L1 is smaller than 1 / 4 of L, the distance between the avoidance groove and the rivet pressing structure is long, and when the rivet pressing structure presses the gasket 50, the avoidance groove is difficult to deform, and the avoidance groove and the through hole 52 are likely to be deformed at the same time. If L1 is larger than 3 / 4 of L, the processing difficulty of the avoidance groove increases, and the gasket 50 is likely to be damaged during the processing process. At the same time, if L1 is larger than 3 / 4 of L, the gasket 50 is easily damaged during use, and the service life of the gasket 50 is shortened. Therefore, when L1 is 1 / 4 to 3 / 4 of L, not only can the deformation avoidance portion 51 ensure the effect of complementing the rivet pressing margin, but it can also reduce the difficulty of processing the gasket 50, and can prevent deformation of the through hole 52, ensure normal fluid flow, and reduce the possibility of the gasket 50 being damaged.

[0035] Further, the rivet pressing structure includes a rivet pressing ring 321, which is inclinedly disposed at the second end of the gasket 50 and abuts against the outer periphery of the gasket 50, and has a first end and a second end disposed opposite to each other, the first end of the rivet pressing ring 321 is connected to the piston 30, and the second end of the rivet pressing ring 321 is a free end, the axial distance between the abutment position of the rivet pressing ring 321 abutting against the end face of the second end of the gasket 50 and the first end of the rivet pressing ring 321 is H1, and the depth of the avoidance groove is H2, where H1≦H2≦1.8H1. If H2 is smaller than H1, the depth of the avoidance groove is too small to provide a sufficient rivet pressing margin, and when the rivet pressing ring 321 presses the gasket 50, the outer wall of the gasket 50 is still bent inward, so that the sealing effect of the gasket 50 cannot be ensured, and the possibility of internal leakage of the solenoid valve increases. If H2 is greater than 1.8H1, the depth of the avoidance groove is too large, which increases the difficulty of machining the avoidance groove and reduces the structural strength of the gasket 50. Therefore, if H2 is in the range of H1≦H2≦1.8H1, the avoidance groove can provide a sufficient rivet pressing margin, thereby ensuring the sealing effect of the gasket 50 and simultaneously reducing the difficulty of machining the avoidance groove.

[0036] Specifically, the rivet pressing structure includes a rivet pressing ring 321, which is inclinedly arranged on the second end of the gasket 50, abuts against the outer periphery of the gasket 50, and has a first end and a second end arranged opposite to each other, the first end of the rivet pressing ring 321 is connected to the piston 30, and the second end of the rivet pressing ring 321 is a free end, where D1 is the radial distance between the abutment position of the rivet pressing ring 321 abutting against the end face of the second end of the gasket 50 and the outer wall of the gasket 50, and D2 is the width of the avoidance groove, and 1.1D1≦D2≦2.1D1. If D2 is smaller than 1.1D1, the width of the avoidance groove is too small, and when the rivet pressing ring 321 presses the gasket 50, the avoidance groove cannot provide a sufficient rivet pressing margin, so that the through hole 52 is deformed, and the flow rate of the fluid passing through the through hole 52 and the first balancing passage 31 cannot be ensured, which is disadvantageous to the piston 30 returning to the equilibrium state. If D2 is larger than 2.1D1, the width of the avoidance groove is too large, so that the gasket 50 is easily damaged during use, and the service life of the gasket 50 is shortened. Therefore, if D2 is in the range of 1.1D1≦D2≦2.1D1, the avoidance groove can provide a sufficient rivet pressing margin to prevent the through hole 52 from being deformed, thereby ensuring the flow rate of the fluid passing through the through hole 52 and the first balancing passage 31 and at the same time extending the service life of the gasket 50.

[0037] Optionally, there is a second limiting structure between the gasket 50 and the piston 30, which can limit the relative position between the gasket 50 and the piston 30. When the gasket 50 is provided at the second end of the piston 30, the second limiting structure can limit the gasket 50 to ensure the accurate position of the gasket 50, thereby ensuring the sealing effect of the gasket 50 and avoiding internal leakage in the solenoid valve. Specifically, the first end of the gasket 50 has a first segment and a second segment arranged in a stepped shape, the diameter of the first segment of the gasket 50 is larger than the diameter of the second segment of the gasket 50, the second segment of the gasket 50 is arranged close to the through hole 52, and a third step surface 53 is provided between the first segment and the second segment of the gasket 50, and the piston 30 has a first hole segment and a second hole segment arranged in a stepped shape, the diameter of the first hole segment is larger than the diameter of the second hole segment, and a fourth step surface 33 is provided between the first hole segment and the second hole segment, and the third step surface 53 is engaged and limited by the fourth step surface 33 to form a second limiting structure. The gasket 50 has the third step surface 53, and the piston 30 has the fourth step surface 33, and the third step surface 53 and the fourth step surface 33 are engaged with each other to limit the gasket 50 and the piston 30. By using the above-mentioned structure, the third step surface 53 and the fourth step surface 33 have a simple structure, which facilitates processing and manufacturing, while at the same time ensuring the limiting effect of the second limiting structure.

[0038] Optionally, the bottom of the avoidance groove is arc-shaped, flat, or tapered. In this way, the avoidance groove can be machined using different cutters, so that the machining cost of the avoidance groove can be reduced and the manufacturing efficiency can be improved. The bottom of the avoidance groove is not limited to the above shapes, and although they are not exemplified one by one here, they can be adjusted according to the actual situation.

[0039] As shown in Figures 4 to 8, the second embodiment of the present application is different from the first embodiment in that the valve core assembly 10 provides a solenoid valve including a sleeve 14, a fixed core 13, a movable core 15 and a coil assembly 16. The sleeve 14 is fixedly connected to the valve cover 11, and the fixed core 13 is disposed in the sleeve 14. The movable core 15 is movably disposed in the sleeve 14 and is located at one end close to the valve port 23 of the fixed core 13, one end of the valve core 12 is connected to the movable core 15, and the other end of the valve core 12 is disposed through the sleeve 14 corresponding to the piston 30, and the coil assembly 16 surrounds the outer periphery of the sleeve 14 so as to drive the movable core 15 to move the valve core 12 and the piston 30 toward the direction approaching the fixed core 13. The fixed core 13 is disposed above the movable core 15, and is disposed separately from the fixed core 13 and the valve cover 11, and the movable core 15 can reciprocate within the sleeve 14. In this way, after current is applied to the coil assembly 16, the fixed core 13 generates a magnetic force to drive the movable core 15 to move toward the fixed core 13, and the movable core 15 moves the valve core 12, and after the coil is powered off, the movable core 15 returns to its original position and at the same time moves the valve core 12 to return to its original position, allowing the solenoid valve to maintain a normally closed state, and when current is applied to the coil, the solenoid valve can be opened.

[0040] As shown in Figures 4 to 8, the movable core 15 has an initial position, an engagement position and an adsorption position, and the valve core 12 has an abutment state and a separation state arranged opposite to each other. When the movable core 15 moves from the initial position to the engagement position, the valve core 12 is in the abutment state, and the valve core 12 abuts against the piston 30 so that the piston 30 seals the valve port 23. When the movable core 15 moves from the engagement position to the adsorption position, the movable core 15 moves the valve core 12 toward one end away from the piston 30, the valve core 12 is in the separation state, and the valve core 12 is separated from the piston 30, and the piston 30 moves toward one end away from the valve port 23 so as to open the valve port 23. If the distance from the initial position to the engagement position is C1 and the distance from the initial position to the adsorption position is C, then 2%C≦C-C1≦40%C.

[0041] When the technical aspect of the present application is applied, when the moving core 15 moves from the initial position toward the fixed core 13 by a distance C1, the moving core 15 must overcome the differential pressure of the valve core 12 to move the valve core 12 toward the fixed core 13, and after the valve core 12 moves, it separates from the piston 30, and the piston 30 moves toward one end away from the valve orifice 23, and when the moving core 15 moves by a distance C-C1, the moving core 15 is in the adsorption position, and the piston 30 opens the valve orifice 23. There are processing errors when machining the moving core 15 and the valve core 12, and there are assembly errors when assembling the moving core 15 and the valve core 12, so if C-C1≦2%C, there is a possibility that C1>C under actual working conditions, which will affect the opening of the valve. If C-C1≧40%C, when the movable core 15 moves to the engagement position, the gap between the movable core 15 and the fixed core 13 becomes too large, and in this case, the electromagnetic force between the movable core 15 and the fixed core 13 is not large enough, which may affect the effect of opening the valve. Therefore, in this embodiment, by setting C-C1 within the above range, the smoothness of opening the valve can be improved. In addition, the above configuration has a simple structure. Alternatively, C-C1=2%C, C-C1=10%C, C-C1=20%C, C-C1=30% or C-C1=40%, and in this embodiment, C-C1=5%C.

[0042] As shown in FIG. 4 , a third mounting hole 151 is provided at one end of the movable core 15 close to the valve orifice 23, the valve core 12 is movably provided within the third mounting hole 151, one end of the valve core 12 close to the valve orifice 23 protrudes from the movable core 15 and abuts against the piston 30, and a third limiting structure is provided between the valve core 12 and the movable core 15, and the third limiting structure is used to limit the amount of displacement of the movable core 15 relative to the valve core 12.

[0043] Specifically, when the valve is opened, under the action of electromagnetic force, the movable core 15 moves toward the fixed core 13 until the movable core 15 moves to the engagement position, and in this case, under the action of the limiting structure, the movable core 15 moves the valve core 12 and moves synchronously toward the fixed core 13. The above configuration is simple in structure, and the third mounting hole 151 can play the role of guiding and limiting the movement of the valve core 12, and further, the stability of the movement of the valve core 12 can be ensured. Moreover, the above configuration can ensure the compactness of the entire structure.

[0044] Alternatively, as shown in Figures 4 and 7, the movable core 15 includes a magnetic part 152 and a packing 153, the magnetic part 152 is magnetically engaged with the fixed core 13, the packing 153 is provided at one end of the magnetic part 152 close to the valve port 23 and located in the third mounting hole 151 to form a positioning part, and the positioning part is located at one end of the third mounting hole 151 close to the valve port 23, the valve core 12 includes a first sub-segment 124 and a second sub-segment 125 provided in a stepped shape along the direction from the fixed core 13 to the valve port 23, the first sub-segment 124 and the second sub-segment 125 form a fifth step surface, and the positioning part is limitingly engaged with the fifth step surface to form a third limiting structure. Specifically, the first sub-segment 124 and the fifth step surface are both located within the third mounting hole 151, and one end of the second sub-segment 125 remote from the first sub-segment 124 penetrates the positioning portion and abuts and engages with the piston 30. When the movable core 15 moves to the engagement position, the end face of the positioning portion close to the fixed core 13 comes into contact with the fifth step surface, and when the movable core 15 continues to move toward the adsorption position, the valve core 12 moves together with the positioning portion. With the above configuration, the distance between the positioning portion and the fifth step surface is equal to the distance from the initial position to the engagement position. When it is necessary to adjust the distance from the initial position to the engagement position, it is sufficient to adjust the distance between the end face of the positioning portion close to the fixed core 13 and the fifth step surface, and the applicability of this embodiment can be further ensured.

[0045] Furthermore, the first sub-segment 124 includes an engagement segment 1241 and an intermediate connection segment 1242 that are provided in a stepped shape along the direction from the fixed core 13 to the valve port 23, and the diameter of the engagement segment 1241 is larger than that of the intermediate connection segment 1242, and the engagement segment 1241 is clearance-fitted into the third mounting hole 151, and the diameter of the intermediate connection segment 1242 is larger than that of the second sub-segment 125, and the intermediate connection segment 1242 and the second sub-segment 125 form a fifth step surface. With the above configuration, during the process of the movement of the valve core 12, only the guide engagement between the engagement segment 1241 and the third mounting hole 151 is required, so that the friction force between the valve core 12 and the hole wall of the third mounting hole 151 is reduced. In addition, the above configuration can reduce the mass of the valve core 12, improve the smoothness of the movement of the valve core 12, and ensure the weight reduction of the solenoid valve. The diameter of the intermediate connection segment 1242 is larger than that of the second sub-segment 125 and smaller than that of the engagement segment 1241, so that the structural strength of the entire valve core 12 can be ensured.

[0046] Here, packing 153 has a circular sheet-like structure, and one end face of packing 153 close to fixed core 13 abuts against and engages with the fifth step face. The above configuration is simple in structure, and can ensure that movable core 15 is compact in structure.

[0047] 7, an assembly hole 1521 is provided at one end of the magnetic part 152 close to the valve port 23, the diameter of the assembly hole 1521 is larger than the diameter of the third mounting hole 151, the assembly hole 1521 is provided in communication with the third mounting hole 151, and the packing 153 is provided in the assembly hole 1521 and interference-fitted into the assembly hole 1521. By doing so, convenience in assembling the packing 153 and the magnetic part 152 can be ensured.

[0048] Optionally, the packing 153 is integrally molded and connected with the magnetic part 152, and the assembly hole 1521 is a screw hole, and as shown in Fig. 4, the solenoid valve further includes a piston spring 34, which is disposed in the receiving chamber 22, an end of the piston spring 34 close to the valve port 23 is connected to the valve seat 20, and an end of the piston spring 34 remote from the valve port 23 is connected to the piston 30. After the valve core 12 and the piston 30 are separated, the piston spring 34 drives the piston 30 to move toward the end remote from the valve port 23, to ensure the smooth opening of the valve port 23.

[0049] As shown in Fig. 4 to Fig. 7, the movable core 15 has one end close to the fixed core 13 provided with a fourth mounting hole 155, one end of the first elastic member 17 is provided in the fourth mounting hole 155, and the other end of the first elastic member 17 protrudes from the movable core 15 and abuts against the fixed core 13, and the first elastic member 17 is used to drive the movable core 15 to move it from the adsorption position to the initial position. By using the above configuration, it is possible to ensure smooth movement of the movable core 15 from the adsorption position to the initial position, and by providing the first elastic member 17 in the fourth mounting hole 155, it is possible to ensure stability and reliability of the attachment of the first elastic member 17. In this embodiment, the first elastic member 17 is a spring, which has a simple structure and is easy to attach to the fourth mounting hole 155.

[0050] Furthermore, the movable core 15 is further provided with a communication hole 156, which is located between the third mounting hole 151 and the fourth mounting hole 155, one end of the communication hole 156 communicating with the third mounting hole 151 and the other end of the communication hole 156 communicating with the fourth mounting hole 155, and the third mounting hole 151, the communication hole 156 and the fourth mounting hole 155 are provided coaxially. The diameter of the communication hole 156 is smaller than the diameter of the third mounting hole 151, and the diameter of the communication hole 156 is smaller than the diameter of the fourth mounting hole 155, and the third mounting hole 151, the communication hole 156 and the fourth mounting hole 155 form a second balancing passage.

[0051] Specifically, one end of the second balancing passage extends to an end of the movable core 15 close to the fixed core 13, and the other end of the second balancing passage extends to an end of the movable core 15 close to the valve port 23. By providing the second balancing passage in the movable core 15, the inside of the accommodating chamber 22 can quickly achieve internal balance during the process of the movable core 15 moving, and the movable core 15 and the valve core 12 can move smoothly.

[0052] 4 and 7, a balancing hole 154 is provided on the side wall of the movable core 15, the balancing hole 154 is provided at one end of the movable core 15 close to the fixed core 13, and the balancing hole 154 is provided to communicate with the second balancing passage. Specifically, the balancing hole 154 is provided in the magnetic part 152. The balancing hole 154 is provided perpendicular to the second balancing passage. The configuration of the balancing hole 154 can further improve the speed at which the accommodating chamber 22 achieves internal balance, and further improve the smoothness of the movement of the movable core 15 and the valve core 12.

[0053] As shown in Figures 4 to 7, the second elastic member 18 is installed in the third mounting hole 151, one end of the second elastic member 18 away from the valve port 23 is connected to the valve core 12, and the other end of the second elastic member 18 is connected to the movable core 15. When the movable core 15 moves from the engagement position to the adsorption position, the valve core 12 is separated from the piston 30, in this case, the second elastic member 18 plays a certain driving role for the valve core 12, and can further improve the smoothness of the movement of the valve core 12. In the process of the movement of the movable core 15 from the adsorption position to the initial position, the movable core 15 always drives the valve core 12 to move, and when the valve core 12 and the piston 30 contact each other, the second elastic member 18 can play a buffering role for the valve core 12, and can further ensure the stability of the contact between the valve core 12 and the piston 30.

[0054] As shown in Figures 4 and 8, the valve port 23 is provided at one end of the valve seat 20 away from the valve cover 11, a screw hole is provided at one end of the valve seat 20 away from the valve port 23, the valve cover 11 is provided in the screw hole and screwed to the valve seat 20, and one end of the sleeve 14 is inserted into the one end of the valve cover 11 away from the valve port 23 and welded to the valve cover 11. In the conventional embodiment, the valve cover 11 and the valve seat 20 are connected by welding, but when connecting by welding, the elements to be welded need to be made of stainless steel material, which is costly. In this embodiment, the valve cover 11 and the valve seat 20 are connected by screwing, so the entire valve seat 20 can be made of aluminum material, which saves the cost of the valve seat 20.

[0055] 9 to 11, the third embodiment of the present application is different from the first embodiment in that the coil assembly 16 includes a magnetic induction frame 161 and a coil 162, the magnetic induction frame 161 includes a first horizontal plate 1611, a vertical plate 1612 and a second horizontal plate 1613 connected in sequence, the coil 162 is located between the first horizontal plate 1611 and the second horizontal plate 1613 and fitted to the outer periphery of the sleeve 14 and the fixed core 13, the solenoid valve further includes a fixing member 60, and the fixing member 60 provides a solenoid valve located between the second horizontal plate 1613 and the valve cover 11 and / or the valve seat 20. Optionally, the solenoid valve further includes a seat body 80, the seat body 80 has an installation chamber, the valve seat 20 is disposed in the installation chamber, one side of the fixing member 60 away from the coil assembly 16 is connected to the seat body 80, and the fixing member 60 is used to connect to the seat body 80 to which the valve seat 20 is attached.

[0056] In this embodiment, the valve seat 20, the coil assembly 16 and the valve cover 11 can be collectively referred to as a valve housing assembly, and the connection between the valve housing assembly and the seat body 80 is realized by providing the fixing member 60, so that the direct contact between the valve seat and the coil assembly 16 can be avoided, and the fixing member 60 can withstand the action force of the fluid, so that in the prior art, some solenoid valves directly screw the valve seat 20 to the seat body 80 during use, which reduces the mounting strength of the solenoid valve, and the fluid in the solenoid valve applies a force to the solenoid valve in the direction away from the seat body 80, which causes the action force of the fluid to impact the coil 162 and damage the coil 162, and the mounting strength and reliability of the solenoid valve are improved. In addition, by providing the fixing member 60, the valve seat 20 and the seat body 80 can be simply inserted and fitted, and there is no need to use screwing, so that the dimensions can be reduced and the manufacturing costs can be reduced. By forming the magnetic induction frame 161 from a first horizontal plate 1611, a vertical plate 1612, and a second horizontal plate 1613 connected in order, not only can the coil 162 be fixed, but also the connection with the fixing member 60 can be easily performed. By providing the seat body 80, the valve seat 20 can be easily accommodated, and by connecting one side of the fixing member 60 away from the coil assembly 16 to the seat body 80, the stability and reliability of the connection between the coil assembly 16 and the seat body 80 can be further enhanced.

[0057] Specifically, the fixing member 60 includes a first convex portion 61, a plate body 62 and a second convex portion 63 connected in sequence, the valve cover 11 is fixedly connected to the fixed iron core 13, the plate body 62 is fitted to the fixed iron core 13, one side of the plate body 62 abuts the valve cover 11 and / or the valve seat 20, and the other side of the plate body 62 abuts the second cross plate 1613, which is connected to both the first convex portion 61 and the second convex portion 63, and both the first convex portion 61 and the second convex portion 63 are used to connect to the seat body 80. By providing the first protrusion 61 and the second protrusion 63, the plate body 62, the second horizontal plate 1613 and the seat body 80 can be easily connected, and by abutting one side of the plate body 62 against the end face of the valve cover 11 provided in the valve seat 20 (the end face of the valve cover 11 located in the valve seat 20 is flush with the top face of the valve seat 20) and abutting the other side of the plate body 62 against the second horizontal plate 1613, the valve housing assembly and the seat body 80 can be restricted in the axial direction, and the attachment strength is ensured. Here, since the fixing member 60 has an integral structure and the valve cover 11 and the fixed core 13 are provided integrally, it is easy to ensure the coaxiality of the solenoid valve.

[0058] As shown in FIG. 11 , the fixed member 60 is made of a magnetic induction material and further includes a connecting ring 64 provided on a plate body 62, the plate body 62 has a through hole 621, the chamber of the connecting ring 64 communicates with the through hole 621, the integrally molded valve cover 11 and fixed core 13 pass through the connecting ring 64 and the through hole 621, and the outer wall of the connecting ring 64 is engaged with the inner wall of the coil 162.

[0059] In this embodiment, a connecting ring 64 is provided on the plate body 62, and the chamber of the connecting ring 64 communicates with the through hole 621, making it easier for the integrally molded valve cover 11 and fixed core 13 to pass through. In addition, the configuration of the connecting ring 64 increases the magnetic induction area between the coil assembly 16 and the valve seat 20, reduces the magnetic resistance, and effectively improves the performance of the magnetic circuit, thereby improving the performance of the solenoid valve.

[0060] As shown in FIG. 10, if the distance between the end face connected to the sleeve 14 of the fixed core 13 and the plate body 62 is P2, the dimension of the second transverse plate 1613 along the axial direction of the valve seat 20 is P1, and the axial dimension of the connecting ring 64 is P, then P1 < P < P2. When installing, after fitting the coil 162 onto the outer peripheral surfaces of the sleeve 14, the integrally formed valve cover 11, and the fixed core 13, there is an installation gap between the coil 162 and its outer peripheral surface. By limiting the axial dimension P of the connecting ring 64 within the above range, some of the installation gaps can be sealed, the magnetic induction area can be further increased, the recovery of the magnetic circuit can be increased, and the magnetic resistance can be decreased, effectively improving the performance of the magnetic circuit and thus improving the performance of the solenoid valve. At the same time, the above configuration can also avoid the problem of magnetic circuit disturbance caused by the magnetic circuit passing through the connecting ring 64 and simultaneously passing through the movable core 15 and the fixed core 13.

[0061] As shown in FIGS. 9 to 11, the first convex portion 61 has a first mounting hole 611, the second convex portion 63 has a second mounting hole 631, the second transverse plate 1613 has a first assembly hole and a second assembly hole, and the solenoid valve further includes a first fastening member 71 and a second fastening member 72. The first fastening member 71 passes through the first assembly hole and the first mounting hole 611, the second fastening member 72 passes through the second assembly hole and the second mounting hole 631, and the first fastening member 71 and the second fastening member 72 are used to connect to the seat body 80. Using the above connection method, by connecting the first convex portion 61 and the coil assembly 16 with the first fastening member 71 and connecting the second convex portion 63 and the coil assembly 16 with the second fastening member 72, the connection stability and reliability of the coil assembly 16, the fixing member 60, and the seat body 80 are further enhanced. Here, both the first fastening member 71 and the second fastening member 72 are bolts.

[0062] Specifically, the second horizontal plate 1613 includes a third protrusion 16131, a main plate 16132, and a fourth protrusion 16133 connected in this order, the main plate 16132 is connected to the vertical plate 1612, the coil 162 is located between the main plate 16132 and the first horizontal plate 1611, the third protrusion 16131 is connected to the first protrusion 61, and the fourth protrusion 16133 is connected to the second protrusion 63. By providing the third protrusion 16131 and the fourth protrusion 16133, it becomes easier to connect to the first protrusion 61 and the second protrusion 63, and by providing the coil 162 between the main plate 16132 and the first horizontal plate 1611, it becomes more stable and reliable.

[0063] Alternatively, in this embodiment, the first convex portion 61, the second convex portion 63, the third convex portion 16131, and the fourth convex portion 16133 are all parallel to the top surface of the valve seat 20, and the first convex portion 61 and the second convex portion 63 are connected to the end surface of the seat body 80; alternatively, the first convex portion 61, the second convex portion 63, the third convex portion 16131, and the fourth convex portion 16133 are all perpendicular to the top surface of the valve seat 20, and the first convex portion 61 and the second convex portion 63 are connected to the side surface of the seat body 80. Either of the above two methods can be used to achieve a reliable connection between the coil assembly 16, the fixing member 60, and the seat body 80.

[0064] Optionally, as shown in Figure 10, the solenoid valve further includes a first fastening member 71 and a second fastening member 72, the first fastening member 71 penetrates the second horizontal plate 1613 and the fixing member 60 and is screwed into the seat body 80, the second fastening member 72 penetrates the second horizontal plate 1613 and the fixing member 60 and is screwed into the seat body 80, the outer surface of the valve seat 20 is a cylindrical surface, and the valve seat 20 is inserted into the mounting chamber. The first fastening member 71 penetrates the second horizontal plate 1613 and the fixing member 60 and is screwed into the seat body 80, and the second fastening member 72 penetrates the second horizontal plate 1613 and the fixing member 60 and is screwed into the seat body 80, which facilitates installation and removal.

[0065] Specifically, the outer surface of the valve seat 20 is a cylindrical surface, and the valve seat 20 is inserted into the mounting chamber, so there is no need to screw the valve seat 20 and the seat body 80 together, making it possible to reduce the dimensions and manufacturing costs. Since high pressure exists in the mounting chamber during operation, if the outer surface of the valve seat 20 is a cylindrical surface and inserted into the mounting chamber, there is a problem that the coil assembly 16 will break due to the impact of the high pressure. However, in this embodiment, the fixing member 60 is provided to enhance the impact resistance in the axial direction, effectively solving the problem that the coil assembly 16 is easily broken due to the impact of the high pressure.

[0066] As shown in FIG. 12, in the fourth embodiment of the present application, the valve core assembly 10 includes a sleeve 14, a fixed core 13, a movable core 15 and a coil assembly 16. The sleeve 14 is fixedly connected to the valve cover 11, the fixed core 13 is disposed within the sleeve 14, and the movable core 15 is movably disposed within the sleeve 14 and is located at one end of the fixed core 13 close to the valve port 23. One end of the valve core 12 is connected to the movable core 15, and the other end of the valve core 12 passes through the sleeve 14 and corresponds to the piston 30. The coil assembly 16 surrounds the outer periphery of the sleeve 14 so as to drive the movable core 15 to move the valve core 12 and the piston 30 in a direction approaching the fixed core 13, the coil 162 is located between the first cross plate 1611 and the second cross plate 1613 and is fitted to the outer periphery of the sleeve 14, the plate body 62 is fitted to the sleeve 14, and the sleeve 14 differs from the third embodiment in that it provides an electromagnetic valve that penetrates the connecting ring 64 and the through hole 621.

[0067] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The valve includes a valve core assembly (10), a valve seat (20), and a piston (30), The valve core assembly (10) includes a valve cover (11) and a valve core (12), A part of the valve core (12) is inserted into the valve cover (11), The valve seat (20) has an opening (21), a receiving chamber (22) and a valve port (23); The opening (21) and the valve port (23) are located at both ends of the receiving chamber (22), and both the opening (21) and the valve port (23) are connected to the receiving chamber (22); The valve cover (11) is located in the opening (21) and is connected to the valve seat (20); the piston (30) is movably disposed within the accommodating chamber (22) and has an open position away from the valve port (23) and a sealing position for sealing the valve port (23); the valve core (12) is provided corresponding to the piston (30) and is used to control the movement of the piston (30) between the valve opening position and the valve closing position; The piston (30) and the valve seat (20) are a clearance fit, An electromagnetic valve, wherein an inner wall of the valve seat (20) is used to guide the piston (30).

2. A first limiting structure is provided between the valve cover (11) and the valve seat (20), The solenoid valve according to claim 1 , wherein the first limiting structure is used to limit a relative position between the valve cover (11) and the valve seat (20).

3. The valve cover (11) has a first segment and a second segment that are provided in a stepped shape, a diameter of the first segment of the valve lid (11) is larger than a diameter of the second segment of the valve lid (11), the second segment of the valve lid (11) being disposed adjacent to the valve orifice (23); A first step surface (111) is provided between the first segment of the valve cover (11) and the second segment of the valve cover (11); The valve seat (20) has a first hole segment and a second hole segment that are stepped, a diameter of a first hole segment of the valve seat (20) greater than a diameter of a second hole segment of the valve seat (20); a second step surface (24) between the first bore segment of the valve seat (20) and the second bore segment of the valve seat (20); The solenoid valve according to claim 2 , wherein the first step surface (111) is engaged and limited by the second step surface (24) to form the first limiting structure.

4. The valve core assembly (10) further includes a fixed core (13), a sleeve (14), a movable core (15), and a coil assembly (16). The fixed core (13) is provided at one end of the valve cover (11) remote from the piston (30) and is fixedly connected to the valve cover (11); The sleeve (14) is provided at one end of the fixed core (13) away from the valve port (23), At least a portion of the stationary core (13) is located within the sleeve (14); The movable core (15) is movably provided within the sleeve (14) and is located at one end of the fixed core (13) away from the valve port (23); One end of the valve core (12) is connected to the movable iron core (15), The other end of the valve core (12) is provided to pass through the fixed iron core (13) and correspond to the piston (30), 2. The solenoid valve according to claim 1, wherein the coil assembly (16) surrounds the outer periphery of the sleeve (14) so ​​as to drive the movable core (15) to move the valve core (12) and the piston (30) toward the fixed core (13).

5. The valve core (12) comprises a connecting segment (121), a guide segment (122) and an abutment segment (123), The connecting segment (121) is movably provided within the movable core (15), The guide segments (122) are inserted into the fixed core (13), The abutment segment (123) is used to abut against the piston (30); The valve core assembly (10) further includes a first elastic member (17); The first elastic member (17) is provided within the movable iron core (15), The solenoid valve according to claim 4, wherein one end of the first elastic member (17) close to the valve port (23) abuts against the connection segment (121).

6. The valve core assembly (10) further includes a second elastic member (18); The second elastic member (18) is provided between the movable iron core (15) and the fixed iron core (13), The solenoid valve according to claim 5, wherein an elastic force can be applied to the movable core (15) so that the movable core (15) moves in a direction away from the fixed core (13).

7. The valve core assembly (10) further includes a sleeve (14), a fixed core (13), a movable core (15), and a coil assembly (16). The sleeve (14) is fixedly connected to the valve cover (11); The fixed core (13) is provided in the sleeve (14), The movable core (15) is movably provided within the sleeve (14) and is located at one end of the fixed core (13) close to the valve port (23); One end of the valve core (12) is connected to the movable iron core (15), The other end of the valve core (12) is provided to pass through the sleeve (14) and correspond to the piston (30), 2. The solenoid valve according to claim 1, wherein the coil assembly (16) surrounds the outer periphery of the sleeve (14) so ​​as to drive the movable core (15) to move the valve core (12) and the piston (30) toward the fixed core (13).

8. The valve core (12) has an abutment end (1231), The piston (30) has a first balancing passage (31), The first balancing passage (31) passes through both ends of the piston (30) along the axial direction, A first end of the piston (30) is provided corresponding to the valve port (23), A second end of the piston (30) is provided corresponding to the valve core (12), The second end of the piston (30) is provided with a rivet pressing structure; The solenoid valve further includes a gasket (50); The gasket (50) is provided at a second end of the piston (30), The rivet pressing structure is located on the outside of the gasket (50) and is used to fix the gasket (50); The gasket (50) is provided with a deformation avoidance portion (51) and a through hole (52), The through hole (52) communicates with the first balancing passage (31), The deformation avoidance portion (51) is provided on the outer periphery of the through hole (52) and can provide a space in response to deformation of the gasket (50); The solenoid valve of claim 1, wherein the abutment end (1231) is provided corresponding to an end of the through hole (52) away from the valve port (23), and has an abutment state in which it abuts against the gasket (50) and a separation state in which it is separated from the gasket (50).

9. The gasket (50) has a first end and a second end disposed opposite each other, A first end of the gasket (50) abuts against the piston (30); the rivet pressing structure is located on the outer periphery of the second end of the gasket (50); The solenoid valve according to claim 8 , wherein the deformation avoidance portion (51) is provided at a second end of the gasket (50).

10. The deformation avoidance portion (51) includes an avoidance groove, The solenoid valve according to claim 9, wherein the avoidance groove has a circular ring structure, and the avoidance groove and the through hole (52) are provided coaxially.

11. The gasket (50) has an inner wall and an outer wall, The solenoid valve according to claim 10, wherein a distance between the inner wall and the outer wall is L, and a distance between the avoidance groove and the inner wall of the gasket (50) is L1, where L1 is 1 / 4 to 3 / 4 of L.

12. The rivet pressing structure includes a rivet pressing ring (321); The rivet pressing ring (321) is provided at an inclination on the second end of the gasket (50) and abuts against the outer periphery of the gasket (50); The rivet press ring (321) has a first end and a second end disposed opposite each other, a first end of the rivet press ring (321) connected to the piston (30); a second end of the rivet press ring (321) is a free end; 11. The solenoid valve according to claim 10, wherein H1 is an axial distance between a contact position of the rivet press ring (321) that contacts an end face of the second end of the gasket (50) and a first end of the rivet press ring (321), and H2 is a depth of the avoidance groove, and H1≦H2≦1.8H1.

13. The rivet pressing structure includes a rivet pressing ring (321); The rivet pressing ring (321) is provided at an inclination on the second end of the gasket (50) and abuts against the outer periphery of the gasket (50); The rivet press ring (321) has a first end and a second end disposed opposite each other, a first end of the rivet press ring (321) connected to the piston (30); a second end of the rivet press ring (321) is a free end; The solenoid valve according to claim 10, wherein a radial distance between a contact position of the rivet press ring (321) contacting an end face of the second end of the gasket (50) and an outer wall of the gasket (50) is D1, and a width of the avoidance groove is D2, and 1.1D1≦D2≦2.1D1 is satisfied.

14. The movable core (15) has an initial position, an engagement position, and an attraction position, The valve core (12) has an abutting state and a separated state provided opposite to each other, When the movable core (15) moves from the initial position to the engagement position, the valve core (12) is in the abutting state, and the valve core (12) abuts against the piston (30) so that the piston (30) seals the valve port (23); 8. The solenoid valve according to claim 7, wherein, when the movable iron core (15) moves from the engagement position to the attraction position, the movable iron core (15) moves the valve core (12) toward one end away from the piston (30), the valve core (12) is in the separated state, the valve core (12) is separated from the piston (30), the piston (30) moves toward one end away from the valve orifice (23), and the piston (30) opens the valve orifice (23), and wherein, when a distance from the initial position to the engagement position is C1 and a distance from the initial position to the attraction position is C, 2% C≦C−C1≦40% C.

15. A third mounting hole (151) is provided at one end of the movable core (15) close to the valve port (23), The valve core (12) is movably disposed within the third mounting hole (151), One end of the valve core (12) close to the valve port (23) is provided to protrude from the movable iron core (15) and abuts against and engages with the piston (30); A third limiting structure is provided between the valve core (12) and the movable iron core (15), The solenoid valve according to claim 14, wherein the third limiting structure is used to limit a displacement amount of the movable iron core (15) relative to the valve core (12).

16. A fourth mounting hole (155) is provided at one end of the movable core (15) close to the fixed core (13), The valve core assembly (10) further includes a first elastic member (17); One end of the first elastic member (17) is provided in the fourth mounting hole (155), The other end of the first elastic member (17) protrudes from the movable iron core (15) and is abutted against and engaged with the fixed iron core (13), The solenoid valve according to claim 14, wherein the first elastic member (17) is used to drive the movable core (15) to move from the attracting position to the initial position.

17. The solenoid valve further includes a second elastic member (18); The second elastic member (18) is provided in the third mounting hole (151), The second elastic member (18) has an end remote from the valve port (23) connected to the valve core (12); The solenoid valve according to claim 15, wherein the other end of the second elastic member (18) is connected to the movable core (15).

18. The coil assembly (16) includes a magnetic induction frame (161) and a coil (162); The magnetic induction frame (161) includes a first horizontal plate (1611), a vertical plate (1612) and a second horizontal plate (1613) connected in sequence, The coil (162) is located between the first horizontal plate (1611) and the second horizontal plate (1613), and is fitted to the outer periphery of the sleeve (14) and the fixed core (13), The solenoid valve further includes a fixed member (60); The solenoid valve according to claim 4 or 7, wherein the fixing member (60) is located between the second cross plate (1613) and the valve cover (11) and / or the valve seat (20) and is used to connect to a seat body (80) to which the valve seat (20) is attached.

19. The fixing member (60) includes a first protrusion (61), a plate body (62), and a second protrusion (63), which are connected in this order; One side of the plate body (62) abuts against the valve lid (11) and / or the valve seat (20); The other side of the plate body (62) abuts against the second horizontal plate (1613), The second horizontal plate (1613) is connected to both the first convex portion (61) and the second convex portion (63), The first protrusion (61) and the second protrusion (63) are both used for connecting to the seat body (80), When the sleeve (14) is fixedly connected to the valve cover (11), the plate (62) is fitted to the sleeve (14), 19. The solenoid valve according to claim 18, wherein the plate body (62) is fitted to the fixed core (13) when the fixed core (13) is fixedly connected to the valve cover (11).

20. The fixing member (60) is made of a magnetic induction material and further includes a connecting ring (64) provided on the plate body (62); The plate body (62) has a through hole (621), The chamber of the connecting ring (64) communicates with the through hole (621); 20. The solenoid valve of claim 19, wherein an outer wall of the connecting ring (64) is engaged with an inner wall of the coil (162).

21. The solenoid valve of claim 20, wherein P1 < P < P2 is satisfied, where P2 is the distance between the end face of the fixed core (13) connected to the sleeve (14) and the plate body (62), P1 is the dimension of the second horizontal plate (1613) along the axial direction of the valve seat (20), and P is the axial dimension of the connecting ring (64).

22. The first protrusion (61) has a first mounting hole (611), The second protrusion (63) has a second mounting hole (631), The second horizontal plate (1613) has a first assembly hole and a second assembly hole, The solenoid valve further includes a first fastening member (71) and a second fastening member (72); The first fastening member (71) passes through the first assembly hole and the first mounting hole (611); The second fastening member (72) passes through the second assembly hole and the second mounting hole (631); 20. The solenoid valve according to claim 19, wherein the first fastening member (71) and the second fastening member (72) are used to connect to the seat body (80).

23. The second horizontal plate (1613) includes a third convex portion (16131), a main plate (16132), and a fourth convex portion (16133) connected in sequence, The main plate (16132) is connected to the vertical plate (1612), The coil (162) is located between the main plate (16132) and the first horizontal plate (1611), The third protrusion (16131) is connected to the first protrusion (61), 20. The solenoid valve of claim 19, wherein the fourth convex portion (16133) is connected to the second convex portion (63).

Images