CN113074256A

CN113074256A - Electromagnetic valve

Info

Publication number: CN113074256A
Application number: CN202011270913.7A
Authority: CN
Inventors: 俞舟
Original assignee: Dunan Environment Technology Co Ltd
Current assignee: Dunan Environment Technology Co Ltd
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2021-07-06
Anticipated expiration: 2040-01-03
Also published as: CN113074275B; CN113074275A; CN113074256B

Abstract

The invention provides a solenoid valve which comprises a valve body component and a piston component, wherein the piston component is movably arranged in an accommodating cavity and is provided with a closing position and an opening position, and under the condition that the piston component is at the closing position, the piston component blocks an outlet; the piston member avoiding the outlet and the inlet when the piston member is in the open position; wherein, the piston part includes outer piston and sets up the interior piston structure in the cavity of outer piston, the outer wall of outer piston with hold the inner wall cooperation in chamber, interior piston structure has interior balance hole and encircles the first ring channel that the outer wall of interior piston structure set up, outer piston has outer balance hole, interior balance hole, first ring channel and outer balance hole constitute balanced passageway, the opening in interior balance hole is first opening, the opening in outer balance hole is the second opening. The scheme is convenient for forming a balance channel, so that the piston component can be small in size and compact in structure, and the size of the electromagnetic valve is reduced.

Description

Electromagnetic valve

The present application is a divisional application of the following applications: the application date is 1 month and 3 days in 2020, the application number is 202010006882.8, and the invention is named as an electromagnetic valve.

Technical Field

The invention relates to the technical field of electromagnetic valves, in particular to an electromagnetic valve.

Background

The piston part of the electromagnetic valve is used for plugging the outlet of the electromagnetic valve, a through balance channel is arranged in the piston part, and the switch valve is stable under the condition of small pressure difference. The flow capacity of a balance channel and a pilot valve port of the electromagnetic valve is related to the pressure, the balance channel is positioned on the high-pressure side, the pilot valve port is positioned on the low-pressure side, and when the pressure difference is higher, the valve is opened.

The existing piston part is generally of an integrated structure, and a balance channel penetrates through the piston part, but if the size of the piston part is smaller, the balance channel is not easy to process, which is not beneficial to realizing compact structure and volume reduction of the electromagnetic valve.

Disclosure of Invention

The invention provides a solenoid valve, which is convenient for arranging a balance channel in the solenoid valve.

In order to achieve the above object, the present invention provides a solenoid valve comprising: the valve body component is provided with a containing cavity, an inlet and an outlet which are communicated with the containing cavity; the piston component is movably arranged in the accommodating cavity and is provided with a balance channel, the two ends of the balance channel are respectively provided with a first opening and a second opening, the first opening is positioned on one side of the piston component, which is far away from the outlet, and the second opening is communicated with the inlet; the piston part has a closed position and an open position, and the piston part blocks the outlet under the condition that the piston part is in the closed position; with the piston member in the open position, the piston member is clear of the outlet and the inlet; wherein, the piston part includes outer piston and sets up interior piston structure in the cavity of outer piston, the outer wall of outer piston with the inner wall cooperation that holds the chamber, interior piston structure has interior balance hole and encircles the first ring channel that the outer wall of interior piston structure set up, outer piston has outer balance hole, interior balance hole first ring channel with outer balance hole constitutes balanced passageway, the opening in interior balance hole does first opening, the opening in outer balance hole does the second opening.

Further, the piston component further comprises a first sealing gasket, the first sealing gasket is arranged between the outer piston and the inner piston structure, the end face, facing the outlet, of the first sealing gasket is an annular sealing surface, the end portion of the outer piston is in limit fit with the outer periphery of the annular sealing surface, and the end portion of the inner piston structure is in limit fit with the inner periphery of the annular sealing surface.

Further, the inner piston structure comprises an inner piston and a gasket arranged at the end part of the inner piston, the inner piston is in limit fit with the outer piston, the first sealing gasket is arranged between the outer piston and the inner piston, and the gasket is in limit fit with the inner periphery of the annular sealing surface.

Further, the outer piston comprises an outer cylinder and a first limiting ring arranged at one end, close to the outlet, of the outer cylinder, and the outer wall of the outer cylinder is matched with the inner wall of the accommodating cavity; the inner piston comprises a first inner cylinder and a second inner cylinder which are connected with each other, the outer diameter of the second inner cylinder is smaller than that of the first inner cylinder, the first inner cylinder is in limit fit with the outer cylinder, and the gasket is arranged on the second inner cylinder; the first sealing gasket is positioned in an area formed by surrounding the outer cylinder, the first inner cylinder and the second inner cylinder, the first limiting ring is in limiting fit with the outer peripheral edge of the annular sealing surface, and the end surface of the first inner cylinder is abutted against one side, deviating from the outlet, of the first sealing gasket.

Further, outer piston includes outer barrel and sets up the second spacing ring of the one end of keeping away from of outer barrel the export, the second spacing ring with interior piston riveting.

Further, the outer piston has a second annular groove disposed around an outer wall of the outer piston, the piston member further comprising: the elastic ring is arranged in the second annular groove, a gap is formed in the side wall of the elastic ring, and the radial section of the elastic ring is rectangular; and the sealing ring is arranged in the second annular groove, the inner wall of the sealing ring is abutted to the outer wall of the elastic ring, and the outer wall of the sealing ring is abutted to the inner wall of the accommodating cavity.

Adopt this scheme, the piston part includes outer piston and interior piston structure, and interior piston structure has interior balance hole and encircles the first ring channel that the outer wall of interior piston structure set up, and outer piston has outer balance hole, and interior balance hole, first ring channel and outer balance hole make up balanced passageway. The piston component is arranged in a split structure, different holes or grooves are processed to form balance channels, so that the balance channels are convenient to form, the piston component can be small in size and compact in structure, and the size of the electromagnetic valve is reduced.

Moreover, because the inner side and the outer side of the first sealing gasket are provided with pretightening force, the rigidity of the sealing gasket is greatly improved. When opening the valve under the high pressure difference, when piston part received ascending power, interior piston and outer piston riveting are as an organic whole, drive first sealed upward movement of filling up simultaneously, make sealed the difficult deformation of filling up, have promoted the joint strength who fills up between sealed pad and the piston, and furtherly can reduce interior hourglass, promotes the solenoid valve life-span.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a solenoid valve provided in an embodiment of the present invention;

FIG. 2 shows a schematic structural view of the piston assembly of FIG. 1;

FIG. 3 shows a close-up view of the auxiliary valve and equalization passage of FIG. 2;

FIG. 4 shows a schematic view of the elastic ring of FIG. 1;

FIG. 5 shows a schematic structural view of the valve cover component of FIG. 1;

figure 6 shows a schematic view of the valve needle component of figure 1.

Wherein the figures include the following reference numerals:

10. a valve body member; 11. an inlet; 12. an outlet; 13. a valve seat member; 14. a bonnet member; 15. a suction member; 16. a sleeve; 17. a valve cover; 18. a first spring; 20. an outer piston; 21. an outer cylinder; 22. a first limit ring; 23. a first limit step; 24. a second stop collar; 25. an outer balance hole; 26. a second annular groove; 27. a second opening; 31. a first gasket; 32. a gasket; 33. a second gasket; 34. a valve guide port; 35. an elastic ring; 36. a seal ring; 37. a stopper; 40. an inner piston; 41. a first inner cylinder; 42. a second inner cylinder; 43. a second limit step; 44. an inner balance hole; 45. a first annular groove; 46. a first opening; 50. a valve needle component; 51. a core iron; 52. a second valve needle; 53. a second spring; 54. a gasket; 60. an auxiliary valve; 61. presetting a gap; 62. a first valve needle; 63. an elastic member.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 6, an embodiment of the present invention provides a solenoid valve including: a valve body part 10, wherein the valve body part 10 is provided with a containing cavity, an inlet 11 and an outlet 12 which are communicated with the containing cavity; a piston part movably arranged in the accommodating cavity, wherein the piston part is provided with a balance channel, the two ends of the balance channel are respectively provided with a first opening 46 and a second opening 27, the first opening 46 is positioned on one side of the piston part, which is far away from the outlet 12, and the second opening 27 is communicated with the inlet 11; the piston member has a closed position and an open position, the piston member closing off the outlet 12 in the case of the piston member being in the closed position; with the piston member in the open position, the piston member is clear of the outlet 12 and the inlet 11; wherein, the piston part includes outer piston 20 and sets up the interior piston structure in outer piston 20's cavity, outer piston 20's outer wall and the inner wall cooperation that holds the chamber, interior piston structure has interior balance hole 44 and encircles the first ring channel 45 of the outer wall setting of interior piston structure, outer piston 20 has outer balance hole 25, balanced passageway is constituteed to interior balance hole 44, first ring channel 45 and outer balance hole 25, the opening of interior balance hole 44 is first opening 46, the opening of outer balance hole 25 is second opening 27.

With this arrangement, the piston assembly includes an outer piston 20 and an inner piston structure having an inner balance aperture 44 and a first annular groove 45 disposed around the outer wall of the inner piston structure, the outer piston 20 having an outer balance aperture 25, the inner balance aperture 44, the first annular groove 45 and the outer balance aperture 25 forming a balance channel. The piston component is arranged in a split structure, different holes or grooves are processed to form balance channels, so that the balance channels are convenient to form, the piston component can be small in size and compact in structure, and the size of the electromagnetic valve is reduced.

Wherein the inner piston structure may comprise only the inner piston 40, the inner piston 40 having an inner balance bore 44 and a first annular groove 45 provided around the outer wall of the inner piston 40. Alternatively, the inner piston structure includes the inner piston 40 and other structures.

Alternatively, as shown in fig. 2 and 3, the first annular groove 45 is oriented parallel to the axial direction of the inner balance hole 44, and the axial direction of the outer balance hole 25 is perpendicular to the axial direction of the inner balance hole 44, so that the flow direction of the fluid in the balance passage can be changed.

In this embodiment, the piston component further includes a first sealing gasket 31, the first sealing gasket 31 is disposed between the outer piston 20 and the inner piston structure, an end surface of the first sealing gasket 31 facing the outlet 12 is an annular sealing surface, an end portion of the outer piston 20 is in limit fit with an outer peripheral edge of the annular sealing surface, and an end portion of the inner piston structure is in limit fit with an inner peripheral edge of the annular sealing surface. Adopt above-mentioned scheme, can all carry on spacingly and support to the outer peripheral edge and the interior peripheral edge of the annular seal face of first sealed pad 31 through the tip of outer piston 20 and the tip of interior piston structure, improved rigidity and the compressive capacity of first sealed pad 31 like this, so even open the valve under the high pressure difference, first sealed pad 31 is difficult for deformation, has improved reliability and life.

In the present embodiment, the inner piston structure includes an inner piston 40 and a gasket 32 disposed at an end portion of the inner piston 40, the inner piston 40 is in limit fitting with the outer piston 20, the first packing 31 is disposed between the outer piston 20 and the inner piston 40, and the gasket 32 is in limit fitting with an inner peripheral edge of the annular sealing surface. This increases the contact area with the inner periphery of the annular seal surface by the gasket 32, thereby improving the stopper effect.

Specifically, the outer piston 20 comprises an outer cylinder 21 and a first limit ring 22 arranged at one end of the outer cylinder 21 close to the outlet 12, and the outer wall of the outer cylinder 21 is matched with the inner wall of the accommodating cavity; the inner piston 40 comprises a first inner cylinder 41 and a second inner cylinder 42 which are connected with each other, the outer diameter of the second inner cylinder 42 is smaller than that of the first inner cylinder 41, the first inner cylinder 41 is in limit fit with the outer cylinder 21, and the gasket 32 is arranged on the second inner cylinder 42; the first sealing gasket 31 is located in the area formed by the outer cylinder 21, the first inner cylinder 41 and the second inner cylinder 42, the first limiting ring 22 is in limited fit with the outer periphery of the annular sealing surface, and the end surface of the first inner cylinder 41 is abutted against one side of the first sealing gasket 31 departing from the outlet 12. Through the above arrangement, two end faces and two annular faces of the first sealing gasket 31 can be supported and limited, the outer peripheral edge and the inner peripheral edge of the annular sealing surface are limited, the deformation resistance of the first sealing gasket 31 is improved, and therefore deformation of the first sealing gasket 31 is avoided.

Optionally, the second inner cylinder 42 has a limit step in limit fit with the gasket 32, and the second inner cylinder 42 is riveted with the gasket 32, so that the reliable connection between the second inner cylinder 42 and the gasket 32 is realized.

Optionally, the inner wall of the outer piston 20 has a first limit step 23, the outer wall of the inner piston 40 has a second limit step 43, and the first limit step 23 is matched with the second limit step 43. With the above arrangement, accurate positioning of the outer piston 20 and the inner piston 40 is achieved, and pressing of the first packing 31 at the time of assembly can be avoided.

In this embodiment, the outer piston 20 includes an outer cylinder 21 and a second stopper ring 24 disposed at an end of the outer cylinder 21 away from the outlet 12, and the second stopper ring 24 is riveted to the inner piston 40. By the arrangement, the reliable connection of the outer piston 20 and the inner piston 40 is realized, and the riveting mode is convenient to operate.

Optionally, the inner piston structure further comprises: and a second gasket 33, wherein the second gasket 33 is arranged at one end of the inner piston 40 far away from the outlet 12, the second gasket 33 is provided with a pilot valve port 34, the pilot valve port 34 is communicated with the through hole of the inner piston 40, and the through hole of the inner piston 40 is communicated with the outlet 12. Optionally, the second sealing gasket 33 is in limit fit with the inner piston 40 through a limit step, and one end of the inner piston 40 far away from the outlet is riveted with the second sealing gasket 33. By the above arrangement, a reliable connection of the second gasket 33 to the inner piston 40 is achieved.

In this embodiment, the outer piston 20 has a second annular groove 26 disposed around the outer wall of the outer piston 20, and the piston assembly further comprises: the elastic ring 35 is arranged in the second annular groove 26, a gap is formed in the side wall of the elastic ring 35, and the radial section of the elastic ring 35 is rectangular; and a seal ring 36 disposed in the second annular groove 26, wherein an inner wall of the seal ring 36 abuts against an outer wall of the elastic ring 35, and an outer wall of the seal ring 36 abuts against an inner wall of the accommodating chamber. Thus, the sealing ring 36 can be supported by the elastic ring 35, so that the sealing ring 36 has a tendency of expanding outwards, and the outer wall of the sealing ring 36 is tightly matched with the inner wall of the accommodating cavity, thereby improving the sealing property and reducing the leakage of the piston part. Moreover, the section of the elastic ring 35 is rectangular, so that the radial space can be greatly saved, the installation difficulty is reduced, the tensile force of the sealing ring 36 is improved, and the leakage around the piston component is reduced.

Further, the solenoid valve further comprises an auxiliary valve 60, the auxiliary valve 60 is movably disposed in the balance passage, a predetermined gap 61 is provided between the auxiliary valve 60 and an inner wall of the balance passage, and the auxiliary valve 60 has a first state of blocking the first opening 46 and a second state of avoiding the first opening 46. Specifically, the auxiliary valve 60 is located in the inner balance hole 44.

With this arrangement, the auxiliary valve 60 is in the second state at low pressure, the balance passage participates in the flow, and the valve can be opened and closed normally. When the valve is opened under the preset high pressure, the auxiliary valve 60 blocks the balance channel under the pushing of the pressure difference, the balance channel does not participate in the circulation, only the gap between the piston part and the inner wall of the accommodating cavity leaks, the valve is opened easily, the normal valve opening is realized under the high pressure, after the valve is opened, the pressure difference between the front and the rear of the valve is reduced, the auxiliary valve 60 is pushed open, the balance channel participates in the circulation again, and the valve closing is facilitated. Therefore, the scheme can solve the problem that the electromagnetic valve is not easy to open in a high-pressure environment.

Reason analysis of difficult valve opening at high pressure: the gas is compressible, the density is higher under high pressure, and the flow capacity of the high-pressure environment is larger than that of the low-pressure environment under the same pressure difference by the same throttling opening. When the valve is opened under high pressure difference, the lower end of the piston component is high pressure, the upper end of the piston component is medium pressure, the inlet of the pilot valve port is medium pressure, and the outlet of the pilot valve port is low pressure, so that the peripheral circulation capacity of the piston component tends to be amplified relatively, the circulation capacity of the pilot valve port tends to be reduced relatively, the pressure in the upper cavity of the piston component is higher, the piston component is difficult to open under high pressure, and the condition that the piston component is not opened when the pilot valve is opened can occur. When the pilot valve flow capacity margin is insufficient, a product that the main valve can normally open at low pressure may fail to open at high pressure.

The scheme solves the problem of unstable opening of the electromagnetic valve in a gaseous high-pressure state, and is very suitable for transcritical CO₂In practical application of the system, the inside of the valve is completely gaseous medium or even supercritical medium, the pressure difference is very high after the valve is closed, the first opening is timely opened and closed under the action of the auxiliary valve in the piston part at the moment of opening the valve, the reliability problem of opening and closing the valve under the high pressure difference can be solved, and the electromagnetic valve is improvedAnd (4) the operation reliability.

In the present embodiment, the auxiliary valve 60 includes: a first valve needle 62 movably arranged in the balancing channel, the first valve needle 62 having a predetermined gap 61 with an inner wall of the balancing channel, the first valve needle 62 for blocking the first opening 46; a resilient member 63 arranged in the balancing passage, the resilient member 63 cooperating with the first valve needle 62 to exert a force on the first valve needle 62 in a direction of the first valve needle 62 away from the first opening 46. With the above arrangement, when the high-pressure valve is opened, and the pressure difference between the two ends of the first valve needle 62 is greater than the preset value, the elastic member 63 is compressed by the pressure difference force, and the first valve needle 62 blocks the first opening 46, so that the valve is normally opened under high pressure. In the present embodiment, the cross-sectional area of the preset gap 61 is larger than the area of the first opening 46 in the radial direction of the first valve needle 62. Thus, when the auxiliary valve 60 is in the second state, the first opening 46 is open, preventing the auxiliary valve 60 from obstructing fluid flow.

In the present embodiment, the balance passage has a first stop surface and a second stop surface arranged at an interval, the outer wall of the first valve needle 62 has a third stop surface, one end of the elastic element 63 abuts against the first stop surface, the other end of the elastic element 63 abuts against the third stop surface, and the second stop surface is used for limiting the end of the first valve needle 62 far away from the first opening 46. This limits the moving range of the first valve needle 62 by the second stopper and facilitates the elastic member 63 to exert the elastic force on the first valve needle 62.

Optionally, the piston member comprises a body structure and a stop 37 removably disposed on the body structure, a portion of the balancing passage being located on the body structure, another portion of the balancing passage being located on the stop 37, the first opening 46 being located on the stop 37; in the radial direction of the first valve needle 62, the stopper 37 is larger in size than the first valve needle 62. Through the above arrangement, the auxiliary valve 60 can be easily disassembled, and when the auxiliary valve 60 is assembled, the stopper 37 is not installed, and the auxiliary valve 60 is installed in the balance passage and then the stopper 37 is installed. In the present embodiment, the main structure of the piston member can be understood as a general term for the structure of the piston member other than the stopper 37.

In this embodiment, the piston assembly includes an outer piston 20 and an inner piston 40 disposed within the cavity of the outer piston 20, the outer wall of the outer piston 20 cooperates with the inner wall of the receiving cavity, the inner piston 40 has an inner balance hole 44 and a first annular groove 45 disposed around the outer wall of the inner piston 40, the outer piston 20 has an outer balance hole 25, the inner balance hole 44, the first annular groove 45 and the outer balance hole 25 constitute a balance passage, the auxiliary valve 60 is located in the inner balance hole 44, the opening of the inner balance hole 44 is a first opening 46, and the opening of the outer balance hole 25 is a second opening 27. This facilitates the machining of the balance channel and reduces the weight of the piston part.

Alternatively, the valve body part 10 includes a valve seat part 13 and a valve cover part 14 connected to each other, the receiving chamber, the inlet 11 and the outlet 12 are located in the valve seat part 13, the solenoid valve further includes a needle part 50, the needle part 50 is movably disposed in the valve cover part 14, and the needle part 50 is engaged with the piston part. The division of the valve body member 10 into two parts, a valve seat member 13 and a bonnet member 14, facilitates manufacture and assembly. The valve cover part 14 and the valve needle part 50 are matched to enable the valve needle part 50 to block or avoid the valve guide port 34 on the second sealing gasket 33 of the piston part, so that the electromagnetic valve can be opened or closed.

Alternatively, the valve cover member 14 includes a sleeve 16, a suction member 15 provided in the sleeve 16, and a valve cover 17 connected to the sleeve 16, the valve cover 17 being connected to the valve seat member 13, the valve cover 17 having an end surface for restricting the piston member. A first spring 18 is further provided in the sleeve 16, and both ends of the first spring 18 are engaged with the attraction piece 15 and the needle member 50, respectively. The valve needle component 50 comprises a core iron 51, a second valve needle 52, a second spring 53 and a gasket 54, wherein the core iron 51 is movably arranged in the sleeve 16, the second valve needle 52 is arranged in the core iron 51, the second valve needle 52 is used for sealing the valve guide port, the gasket 54 is fixedly connected with the core iron 51, the second spring 53 is sleeved on the second valve needle 52, one end of the second spring 53 is abutted against the second valve needle 52, and the other end of the second spring 53 is abutted against the gasket 54.

During production, the inner piston 40 is riveted with the first sealing gasket 31 and the gasket 32, and then forms an inner piston structure with the second sealing gasket 33. The inner piston structure is assembled with the outer piston 20, the inner piston 40 and the outer piston 20 are provided with positioning surfaces, the positioning surfaces are positioned by metal positioning surfaces in a contact mode, riveting is conducted, the inner piston 40 and the outer piston 20 can be fixed after riveting, the positioning surfaces of the inner piston 40 and the outer piston 20 are extruded during riveting, the first sealing gasket 31 and the outer piston 20 can be slightly contacted and a certain small gap can be reserved, and the outer end face of the first sealing gasket 31 is not excessively extruded due to accuracy. Therefore, the first packing 31 is not deformed by pressure when the inner piston 40 and the outer piston 20 are riveted, and the flatness of the first packing 31 can be ensured to improve internal leakage. Meanwhile, the inner piston 40 and the outer piston 20 have enough connection rigidity, and the consistency of the overall action of the piston components and the connection strength are ensured.

Alternatively, a second gasket 33 is arranged in the piston part, and a pilot valve port 34 is arranged on the second gasket 33, and for the nonlinear pilot structure, the pilot valve port can be arranged at other parts independently without arranging the pilot valve port on the piston part.

In another arrangement, not shown, the inner and outer balance holes are eliminated and the valve closing capability is improved by increasing the outer piston damping and increasing the core iron spring force. For example, increasing the spring force of the elastomeric ring 35 may increase the damping of the piston member.

Alternatively, the bonnet member 14 is formed by welding a bonnet 17, a sleeve 16, and a suction member 15, the bonnet 17 is provided with a stopper surface for stopping the piston member, the bonnet 17 is provided with a positioning surface for positioning the valve seat member 13, and the bonnet 17 and the valve seat member 13 are hermetically welded at the positioning surface.

Optionally, the valve needle component 50 is composed of a core iron 51, a second valve needle 52 and a second spring 53, the core iron 51 does not need to overcome the pressure difference force when the high-pressure valve opening starts, the elastic force of the second spring 53 and the first spring 18 is overcome, when the core iron 51 moves to a certain distance, the second valve needle 52 is driven to move, the electromagnetic force is large at this time, and when the core iron 51 is completely attracted, the second valve needle 52 continues to move upwards under the action of the second spring 53, and the opening degree of the pilot valve is ensured.

Through the scheme, the pretightening force is arranged on the inner side and the outer side of the first sealing gasket 31, so that the rigidity of the sealing gasket is greatly improved. When the valve is opened under the high pressure difference, when the piston part receives upward force, the inner piston 40 and the outer piston 20 are riveted into a whole, and the first sealing gasket 31 is driven to move upwards, so that the sealing gasket is not easy to deform, the connection strength between the sealing gasket and the piston is improved, further, the inner leakage can be reduced, and the service life of the electromagnetic valve is prolonged.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A solenoid valve, comprising:

a valve body component (10), wherein the valve body component (10) is provided with a containing cavity, and an inlet (11) and an outlet (12) which are communicated with the containing cavity;

a piston part which is movably arranged in the accommodating cavity and is provided with a balance channel, the two ends of the balance channel are respectively provided with a first opening (46) and a second opening (27), the first opening (46) is positioned on the side of the piston part facing away from the outlet (12), and the second opening (27) is communicated with the inlet (11); the piston member having a closed position and an open position, the piston member closing off the outlet (12) in the closed position; with the piston member in the open position, the piston member is clear of the outlet (12) and the inlet (11);

wherein, the piston part includes outer piston (20) and sets up the interior piston structure in the cavity of outer piston (20), the outer wall of outer piston (20) with the inner wall cooperation of holding the chamber, interior piston structure has interior balance hole (44) and encircles the first annular groove (45) that the outer wall of interior piston structure set up, outer piston (20) has outer balance hole (25), interior balance hole (44), first annular groove (45) and outer balance hole (25) constitute the balanced passageway, the opening of interior balance hole (44) is first opening (46), the opening of outer balance hole (25) is second opening (27).

2. The electromagnetic valve according to claim 1, characterized in that the piston member further comprises a first sealing gasket (31), the first sealing gasket (31) being arranged between the outer piston (20) and the inner piston structure, the end surface of the first sealing gasket (31) facing the outlet (12) being an annular sealing surface, the end of the outer piston (20) being in a stop-and-go engagement with the outer circumference of the annular sealing surface, and the end of the inner piston structure being in a stop-and-go engagement with the inner circumference of the annular sealing surface.

3. The electromagnetic valve according to claim 2, characterized in that the inner piston structure comprises an inner piston (40) and a gasket (32) arranged at the end of the inner piston (40), the inner piston (40) being in a limit fit with the outer piston (20), the first sealing gasket (31) being arranged between the outer piston (20) and the inner piston (40), the gasket (32) being in a limit fit with the inner periphery of the annular sealing surface.

4. The solenoid valve of claim 3,

the outer piston (20) comprises an outer cylinder body (21) and a first limiting ring (22) arranged at one end, close to the outlet (12), of the outer cylinder body (21), and the outer wall of the outer cylinder body (21) is matched with the inner wall of the accommodating cavity;

the inner piston (40) comprises a first inner cylinder body (41) and a second inner cylinder body (42) which are connected with each other, the outer diameter of the second inner cylinder body (42) is smaller than that of the first inner cylinder body (41), the first inner cylinder body (41) is in limit fit with the outer cylinder body (21), and the gasket (32) is arranged on the second inner cylinder body (42);

the first sealing gasket (31) is located in an area formed by surrounding the outer cylinder body (21), the first inner cylinder body (41) and the second inner cylinder body (42), the first limiting ring (22) is in limiting fit with the outer periphery of the annular sealing surface, and the end face of the first inner cylinder body (41) is abutted to one side, deviating from the outlet (12), of the first sealing gasket (31).

5. The solenoid valve of claim 3,

the outer piston (20) comprises an outer cylinder body (21) and a second limiting ring (24) arranged at one end, far away from the outlet (12), of the outer cylinder body (21), and the second limiting ring (24) is riveted with the inner piston (40).

6. The solenoid valve of claim 2 wherein the outer piston (20) has a second annular groove (26) disposed around an outer wall of the outer piston (20), the piston assembly further comprising:

the elastic ring (35) is arranged in the second annular groove (26), a gap is formed in the side wall of the elastic ring (35), and the radial section of the elastic ring (35) is rectangular;

and the sealing ring (36) is arranged in the second annular groove (26), the inner wall of the sealing ring (36) is abutted to the outer wall of the elastic ring (35), and the outer wall of the sealing ring (36) is abutted to the inner wall of the accommodating cavity.