solenoid valve

Abstract

The application discloses an electromagnetic valve, which comprises a valve rod and a valve core assembly, the valve rod is movable along the axial direction of the electromagnetic valve, the valve rod is provided with a first limiting portion and a second limiting portion, the valve core assembly is sleeved on the outer circumferential side of part of the valve rod, and the valve core assembly is limitedly arranged between the first limiting portion and the second limiting portion along the axial direction of the valve rod; the valve core assembly comprises a first valve core piece, a second valve core piece, a support piece and an elastic fastener, at least part of the support piece is arranged between the first valve core piece and the second valve core piece along the axial direction of the valve core assembly, the elastic fastener is located on the side of the second valve core piece away from the first valve core piece, and the elastic fastener is in abutment with the second limiting portion, so that the valve core assembly is fixed to the valve rod, the deformation of the valve rod is reduced or avoided, and the sealing effect of the first valve core piece and the second valve core piece is improved.

Description

Technical Field

[0001] This invention relates to the field of fluid control, and more specifically to a solenoid valve. Background Technology

[0002] Typically, a solenoid valve's spool moves under the drive of a actuator to control the fluid flow path. Current three-way solenoid valves usually feature an I-shaped stem and two sealing discs fixed to it. The sealing discs are attached to the stem using processes such as heat fusion. However, this process can cause the stem to deform, affecting the sealing performance of the discs. Summary of the Invention

[0003] Based on this, the technical solution of this application provides a solenoid valve that facilitates fixing the valve core assembly to the valve stem, reduces or prevents deformation of the valve stem, and improves the sealing effect of the first valve core component and the second valve core component.

[0004] On one hand, the technical solution of this application provides a solenoid valve, which includes a valve stem and a valve core assembly. The valve stem is movable along the axial direction of the solenoid valve. The valve stem has a first limiting part and a second limiting part. The valve core assembly is sleeved on the outer peripheral side of a portion of the valve stem. Along the axial direction of the valve stem, the valve core assembly is limited between the first limiting part and the second limiting part.

[0005] The valve core assembly includes a first valve core component, a second valve core component, a support component, and an elastic fastener. Along the axial direction of the valve core assembly, at least a portion of the support component is supported between the first valve core component and the second valve core component. The elastic fastener is located on the side of the second valve core component opposite to the first valve core component, and the elastic fastener abuts against the second limiting portion.

[0006] According to the solenoid valve provided in this application, the valve core assembly is sleeved on the outer periphery of part of the valve stem. The support member of the valve core assembly is supported between the first valve core and the second valve core. By setting the elastic fastener on the side of the second valve core away from the first valve core and abutting against the second limiting part, the elastic fastener can fasten the first valve core, the support member, and the second valve core between the first and second limiting parts. During the assembly of the first and second valve cores with the valve stem, the first and second valve cores have good coaxiality with the valve stem under the action of the support member and the elastic fastener, which helps to reduce or avoid deformation of the valve stem and improves the sealing effect of the first and second valve cores. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of the solenoid valve provided in the first embodiment of the present invention;

[0008] Figure 2 yes Figure 1 The diagram shows a cross-sectional structure of a solenoid valve.

[0009] Figure 3 yes Figure 2 The diagram shows an enlarged view of a solenoid valve at position Q1.

[0010] Figure 4 yes Figure 2 The diagram shows a three-dimensional structure of an elastic fastener.

[0011] Figure 5 yes Figure 4 The diagram shows a cross-sectional structure of an elastic fastener.

[0012] Figure 6 This is a front view schematic diagram of the solenoid valve provided in another embodiment of the present invention;

[0013] Figure 7 yes Figure 6 The diagram shows a cross-sectional structure of a solenoid valve along the AA direction.

[0014] Figure 8 yes Figure 7 The diagram shows a three-dimensional structure of a solenoid valve.

[0015] Figure 9 yes Figure 8 The diagram shows a three-dimensional structure of a valve seat;

[0016] Figure 10 yes Figure 9 The diagram shows a cross-sectional structure of a valve seat;

[0017] Figure 11 yes Figure 1 A schematic diagram of the cross-sectional structure of another solenoid valve is shown in the figure;

[0018] Figure 12 yes Figure 11 The diagram shows an enlarged structural schematic of a solenoid valve at position Q2.

[0019] Figure label:

[0020] 1. Solenoid valve; 101. First valve port; 102. Second valve port; 103. First channel; 104. Second channel; 105. Third channel; 10. Valve stem; 11. First limiting part; 12. Second limiting part; 121. Limiting groove; 122. Expanded diameter part; 13. Small diameter part; 14. Connecting rod part; 15. Flange part; 16. First balancing hole; 20. Valve core assembly; 21. First valve core component; 211. First groove; 212. First sealing surface; 22. Second valve core component; 221. Second groove; 222. Second sealing surface; 23. Support component; 231. First support part; 232. Second support part; 233. Third support part; 234. Fourth support part; 235. Connecting part; 24. Elastic fastener; 240. Spring piece; 241. Bullet piece; 242. Plate body; 25. Gasket; 30. Valve seat; 301. Fluid cavity; 31. Housing; 32. Stop; 33. Second seal; 34. Reinforcing rib; 351. First sealing ring; 352. Second sealing ring; 36. Limiting part; 37. Communicating channel; 40. Drive assembly; 41. Stationary iron core; 42. Moving iron core; 421. Second balance hole; 422. Third balance hole; 43. Coil assembly; 44. Magnetic conductor; 45. Isolation sleeve; 451. First part; 452. Second part; 46. First seal; 47. Drive housing; 471. Mounting part; 48. Spring; 50. Housing; 51. Valve cavity. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] like Figures 1 to 5 As shown, this embodiment of the invention provides a solenoid valve 1, which can be used in a vehicle thermal management system or in a motor cooling system. Specifically, the solenoid valve 1 provided in this embodiment can be used in a coolant circulation system, such as a cooling oil circulation system or a cooling water circulation system. This solenoid valve 1 can perform flow path isolation, conduction, and switching functions. Alternatively, the solenoid valve 1 provided in this embodiment can also be used in an oil cooling system.

[0023] Specifically, the solenoid valve 1 in this embodiment of the invention includes a housing 50, a valve seat 30, a valve stem 10, and a valve core assembly 20. The solenoid valve 1 has a first valve port 101 and a second valve port 102. The valve core assembly 20 is located between the first valve port 101 and the second valve port 102. The second valve core 22 can abut against the second valve port 102. The first valve port 101 can be located on the valve seat 30, and the second valve port 102 can be located on the housing 50. The valve seat 30 is sleeved on the inner surface of the housing 50. A portion of the valve stem 10 is sleeved inside the valve seat 30. The valve stem 10 can move axially along the solenoid valve 1, and the valve stem 10 can drive the valve core assembly 20 to move axially along the solenoid valve 1 to open the first valve port 101 and / or the second valve port 102.

[0024] The housing 50 has a first channel 103, a second channel 104, and a third channel 105. Each of the three channels has a communication port on its inner wall. The housing 50 also has a valve cavity 51, with at least a portion of the valve core assembly 20 located within the valve cavity 51. Along the axial direction of the solenoid valve 1, the valve core assembly 20 is located between the first valve port 101 and the second valve port 102. The communication port on the inner wall of the housing 50 of the first channel 103 is defined as the first communication port, the communication port on the inner wall of the housing 50 of the second channel 104 is defined as the second communication port, and the communication port on the inner wall of the housing 50 of the third channel 105 is defined as the third communication port. Along the axial direction of the solenoid valve 1, the height of the first communication port is between the height of the second communication port and the height of the third communication port. The first communication port can communicate with the second communication port through the first valve port 101, and with the third communication port through the second valve port 102. In this article, the first channel 103 can be the import channel, and the second channel 104 and the third channel 105 can be the export channels.

[0025] To stably fix the valve core assembly 20 to the valve stem 10 and simplify the assembly process between the valve core assembly 20 and the valve stem 10, such as... Figure 2 and Figure 3 As shown, in this embodiment of the invention, the valve stem 10 has a first limiting part 11 and a second limiting part 12. The first limiting part 11 and the second limiting part 12 are spaced apart along the axial direction of the valve stem 10. The valve core assembly 20 is sleeved on the outer peripheral side of a portion of the valve stem 10. Along the axial direction of the valve stem 10, the valve core assembly 20 is limited between the first limiting part 11 and the second limiting part 12.

[0026] Specifically, the valve stem 10 also includes a small-diameter portion 13. Along the axial direction of the valve stem 10, the small-diameter portion 13 is located between the first limiting portion 11 and the second limiting portion 12. At least a portion of the projection of the small-diameter portion 13 onto the first limiting portion 11 is located within the first limiting portion 11, and at least a portion of the valve core assembly 20 is sleeved on the outer surface side of the small-diameter portion 13. Figure 3As shown, the outer peripheral surfaces of the first limiting portion 11, the small-diameter portion 13, and the second limiting portion 12 can all be cylindrical surfaces, and the diameter of the first limiting portion 11 is larger than the diameter of the small-diameter portion 13. Optionally, the diameter of the second limiting portion 12 is larger than the diameter of the small-diameter portion 13. With the above arrangement, it is convenient to position the stop of the valve core assembly 20 between the first limiting portion 11 and the second limiting portion 12.

[0027] Please refer to further information. Figure 3 To limit the position of the elastic fastener 24, in some embodiments, the second limiting portion 12 has a limiting groove 121. The elastic fastener 24 includes a spring portion 240, a portion of which is located in the limiting groove 121. The limiting groove 121 extends from the outer peripheral surface of the second limiting portion 12 into the second limiting portion 12, and the spring portion 240 abuts against the groove wall defining the limiting groove 121. This arrangement allows a portion of the spring portion 240 to be inserted into the limiting groove 121, preventing the spring portion 240 from dislodging from the limiting groove 121 and causing a positional shift in the valve core assembly 20.

[0028] Optionally, the spring section 240 has a ring structure, or as... Figure 4 and Figure 5 As shown, the spring piece portion 240 includes at least two bullet pieces 241 arranged circumferentially spaced along the spring piece portion 240; the spring piece portion 240 is interference-fitted with the second limiting portion 12.

[0029] Specifically, the elastic fastener 24 may further include a plate portion 242, with at least two bullet pieces 241 arranged circumferentially spaced along the plate portion 242. The bullet pieces 240 are fixedly connected to the plate portion 242; for example, the bullet pieces 240 and the plate portion 242 can be fixedly connected by welding, bonding, or other methods, or the bullet pieces 240 and the plate portion can be a stamped integral part. The plate portion 242 connects at least two bullet pieces 241, allowing the clamping force between the bullet pieces 241 and the second limiting portion 12 to be transmitted to the plate portion 242. The plate portion 242 can be directly or indirectly limiting the position of the second valve core 22, preventing the second seal 33 from shifting and affecting the sealing performance between the second seal 33 and the second valve port 102. The spacing between adjacent bullet pieces 241 facilitates deformation of the bullet pieces 241. Optionally, the material of the elastic fastener 24 may include metal, improving the structural strength and service life of the elastic fastener 24.

[0030] In this embodiment of the invention, the bullet piece 241 is located on the side of the plate portion 242 opposite to the second valve core 22, and the bullet piece 241 is bent away from the plate portion 242 in a direction away from the second valve core 22. This arrangement facilitates the transmission of the force exerted by the second limiting portion 12 to the plate portion 242 when the bullet piece 241 is subjected to the abutment force, thereby facilitating the limiting of the second valve core 22 by the plate portion 242. The arc length of the bullet piece 241 increases gradually along the inner edge of the plate portion 242 towards its centerline. This arrangement increases the connection strength between the bullet piece 241 and the plate portion 242, and also increases the abutment stress between the bullet piece 241 and the second limiting portion 12.

[0031] To further prevent the spring piece 240 from dislodging from the limiting groove 121, in some embodiments, the second limiting part 12 further includes an enlarged diameter part 122. The enlarged diameter part 122 defines a portion of the groove wall of the limiting groove 121 and is located on the side of the elastic fastener 24 away from the second valve core 22. The outer peripheral surface of the enlarged diameter part 122 includes a conical surface. Along the direction from the elastic fastener 24 to the enlarged diameter part 122, the circumferential dimension of the enlarged diameter part 122 increases progressively. With the above arrangement, the spring piece 240 can be stopped by the enlarged diameter part 122.

[0032] And / or, the expanded diameter portion 122 includes a hot-riveting structure. In a specific implementation, at the position of the valve stem 10 in the corresponding expanded diameter portion 122, the valve stem 10 includes a pre-limiting structure, which has the same diameter as or smaller than the diameter of the small diameter portion 13. The valve core assembly 20 is assembled from the pre-limiting structure to the small diameter portion 13 until the valve core assembly 20 abuts against the first limiting portion 11, and the spring portion 240 is locked into the limiting groove 121. After the installation steps are completed, the pre-limiting structure is hot-riveted to form the expanded diameter portion 122. Along the direction of the elastic fastener 24 pointing to the expanded diameter portion 122, the circumferential dimension of the expanded diameter portion 122 increases progressively. With the above arrangement, the assembly process between the valve core assembly 20 and the valve stem 10 is simplified, and the valve core assembly 20 and the valve stem 10 are stably limited. In some other embodiments, the expanded diameter portion 122 can also be formed by other processes such as hot-melt process, which is not limited by the present invention.

[0033] To support and limit the first valve core 21 and the second valve core 22, in some embodiments, the support member 23 includes a first support portion 231, a second support portion 232, and a connecting portion 235. The first support portion 231 abuts against the first valve core 21 to facilitate a seal between the first support portion 231 and the first valve core 21. The second support portion 232 abuts against the second valve core 22 to facilitate a seal between the second support portion 232 and the second valve core 22. Along the axial direction of the support member 23, the connecting portion 235 is located between the first support portion 231 and the second support portion 232. The projection of the connecting portion 235 onto the first support portion 231 is located within the first support portion 231, and the projection of the connecting portion 235 onto the second support portion 232 is located within the second support portion 232. Optionally, the outer peripheral surface of the support member 23 can be cylindrical. In this case, the outer diameter of the first support portion 231 is larger than the outer diameter of the connecting portion 235, and the outer diameter of the second support portion 232 is larger than the outer diameter of the connecting portion 235. This simplifies the structure of the support member 23 and reduces its weight. Optionally, a clearance fit is used between the support member 23 and the small-diameter portion 13, which facilitates the assembly of the support member 23 and the small-diameter portion 13.

[0034] Further as Figure 2 , Figure 3 , Figure 7 as well as Figure 11 and Figure 12 As shown, in this embodiment of the invention, the first valve core 21 and the second valve core 22 are made of rubber, which facilitates the sealing between the first valve core 21 and the wall defining the first valve port 101, and the sealing between the second valve core 22 and the wall defining the second valve port 102. The first support portion 231 abuts against the first valve core 21, which helps to achieve a seal between the first support portion 231 and the first valve core 21 and reduces internal leakage.

[0035] Since the first valve core 21 is made of rubber, to reduce damage such as deformation or tearing during installation and operation, in some embodiments, the orthographic projection of the outer peripheral surface of the first valve core 21 onto the first support 231 is located within the first support 231, or the orthographic projection of the outer peripheral surface of the first valve core 21 onto the first support 231 coincides with the outer peripheral surface of the first support 231. Compared to the first support only supporting a portion of the axial end face of the first valve core, the above arrangement allows the entire axial end face of the first valve core 21 to be supported by the first support 231, reducing damage to the first valve core 21 from fluid during operation of the solenoid valve 1. Furthermore, when the first valve core 21 abuts against the wall defining the first valve port 101, the first support 231 provides better support, enhancing the ability of the first valve core 21 to close the first valve port 101 and reducing fluid leakage or crossflow.

[0036] And / or, further, since the second valve core 22 is made of rubber, to reduce damage such as deformation or tearing of the second valve core 22 during installation and operation, the orthographic projection of the outer peripheral surface of the second valve core 22 onto the second support portion 232 is located within the second support portion 232, or the orthographic projection of the outer peripheral surface of the second valve core 22 onto the second support portion 232 coincides with the outer peripheral surface of the second support portion 232. Compared to the second support portion only supporting a portion of the axial end face of the second valve core, the above arrangement allows the entire axial end face of the second valve core 22 to be supported by the second support portion 232, reducing damage to the second valve core 22 by fluid during the operation of the solenoid valve 1. Furthermore, when the second valve core 22 abuts against the wall defining the second valve port 102, the second support portion 232 can provide better support force, improving the ability of the second valve core 22 to close the second valve port 102 and reducing fluid leakage or crossflow.

[0037] Furthermore, such as Figure 11 and Figure 12 As shown, the support member 23 also includes a third support portion 233 and a fourth support portion 234. The third support portion 233 is abutted between the first limiting portion 11 and the first valve core 21, and the fourth support portion 234 is abutted between the second valve core 22 and the elastic fastener 24. Based on this, the third support portion 233 abuts against the first limiting portion 11, the elastic fastener 24 abuts against the fourth support portion 234, and the connecting portion connects the first support portion 231, the second support portion 232, the third support portion 233, and the fourth support portion 234 into a single structure.

[0038] Further integration Figures 2 to 7 To further simplify the assembly process of the first valve core 21 and the second valve core 22, in some embodiments, the first valve core 21 abuts against the first limiting portion 11 to facilitate a seal between the first valve core 21 and the first limiting portion 11. An elastic fastener 24 abuts against the second valve core 22, or the valve core assembly 20 further includes a gasket 25, which abuts against the end face of the second valve core 22 opposite to the support member 23, and the elastic fastener 24 abuts against the gasket 25. By providing the gasket 25 structure, the contact area between the gasket 25 and the second valve core 22 can be increased, and assembly is facilitated.

[0039] Based on this, in order to increase the contact area between the first valve core 21 and the first limiting part 11, in some embodiments, the first valve core 21 abuts against the first limiting part 11, the first valve core 21 has a first groove 211, at least a portion of the first limiting part 11 is embedded in the first groove 211, and the first limiting part 11 is interference-fitted with the first valve core 21 to facilitate the reduction of internal leakage.

[0040] Further, the first valve core 21 includes a first sealing surface 212, which can be a conical surface and can abut against the wall surface defining the first valve port 101. Optionally, the wall surface defining the first valve port can include a conical surface or an arc surface. To further increase the contact area between the first valve core 21 and the first limiting portion 11, the first sealing surface 212 is disposed adjacent to the side wall surface defining the first groove 211. In this embodiment of the invention, the first sealing surface 212 and the side wall surface defining the first groove 211 have an arc transition. Optionally, the first valve core 21 may also include a support frame, which can be nested inside the first valve core 21 to improve the strength of the first valve core 21.

[0041] And / or, the valve core assembly 20 further includes a gasket 25, the gasket 25 of which may be made of plastic. The second valve core 22 has a second groove 221, at least a portion of the gasket 25 is embedded in the second groove 221, and the second valve core 22 and the gasket 25 are interference-fitted. Through the above arrangement, the sealing performance between the second valve core 22 and the gasket 25 is improved, and internal fluid leakage is reduced.

[0042] The second valve core 22 includes a second sealing surface 222, which may be a conical surface. The first sealing surface 212 is capable of abutting against the wall surface defining the second valve port 102. Optionally, the wall surface defining the second valve port 102 may include a conical surface or an arcuate surface. To further increase the contact area between the second valve core 22 and the gasket 25, the second sealing surface 222 is disposed adjacent to the side wall surface defining the second groove 221. In this embodiment of the invention, the second sealing surface 222 and the side wall surface defining the second groove 221 have an arcuate transition. Optionally, the second valve core 22 may also include a support frame, which may be nested inside the second valve core 22 to improve the strength of the second valve core 22.

[0043] In this embodiment of the invention, both the first valve core 21 and the second valve core 22 are interference-fitted with the small-diameter portion 13, which facilitates improved sealing performance between the first valve core 21 and the second valve core 22 and the small-diameter portion 13. The support member 23 is clearance-fitted with the small-diameter portion 13, which is beneficial for the assembly of the support member 23.

[0044] To enable movement of the valve stem 10, in some embodiments, the solenoid valve 1 further includes a drive assembly 40, which includes a drive housing 47, a coil assembly 43, a stationary iron core 41, a moving iron core 42, and a spring 48. The solenoid valve 1 also includes a valve seat 30, and the coil assembly 43 can be injection molded into the drive housing 47. The valve seat 30 has a first valve port 101, and a portion of the valve stem 10 is sleeved on the inner surface of the valve seat 30. Along the axial direction of the solenoid valve 1, a first valve core 21 is located on the side of the valve seat 30 away from the moving iron core 42. The first valve core 21 can abut against the wall defining the first valve port 101. The moving iron core 42 can move towards or away from the stationary iron core 41. A portion of the valve stem 10 is sleeved on the outer periphery of a portion of the moving iron core 42, and the valve stem 10 and the moving iron core 42 are sealed together. In practical implementation, the moving iron core 42 can be made of pure iron or other magnetic materials, and the valve stem 10 can be made of plastic. The moving iron core 42 and the valve stem 10 can be made into a single unit by plastic coating, which can reduce weight and cost, and also improve the manufacturability of the solenoid valve 1. Alternatively, the valve stem and the moving iron core can be a single structure. Along the axial direction of the solenoid valve 1, the spring 48 is located between the stationary iron core 41 and the moving iron core 42, and the spring 48 can provide elastic force for the moving iron core 42 to return to its original position.

[0045] Furthermore, the solenoid valve 1 also includes a first seal 46 located between the valve stem 10 and the valve seat 30 along the radial direction of the valve seat 30. This arrangement helps to reduce fluid leakage in the fluid cavity 301 and the chamber where the moving iron core 42 is located.

[0046] Furthermore, to prevent fluid from entering the coil assembly 43, the solenoid valve 1 also includes an isolation sleeve 45 and a magnetic conductor 44. At least a portion of the moving iron core 42 is fitted onto the inner surface of the isolation sleeve 45, and the stationary iron core 41 is located outside the isolation sleeve 45. A second sealing element 33 is provided between the isolation sleeve 45 and the valve seat 30, and a spring 48 abuts against the moving iron core 42 and the isolation sleeve 45.

[0047] Furthermore, to reduce the opening and / or closing resistance of the solenoid valve in this embodiment of the invention, and to reduce the response time of the solenoid valve 1 in opening and / or closing, the isolation sleeve 45 includes a first part 451 and a second part 452. The inner diameter of the second part 452 is larger than the inner diameter of the first part 451, and the second part 452 is sealed to the valve seat 30. The valve stem 10 has a first balance hole 16, and the moving iron core 42 has a second balance hole 421 and a third balance hole 422. The first balance hole 16, the second balance hole 421, and the third balance hole 422 are all connected. The first balance hole 16 penetrates the axial end of the valve stem 10, the second balance hole 421 penetrates the axial end of the moving iron core 42, and the third balance hole 422 penetrates the side wall of the moving iron core 42. The third balance hole 422 is located close to the valve stem 10, and during the movement stroke of the moving iron core 42 in the working state, at least a portion of the third balance hole 422 is directly opposite the second part 452. With the above settings, fluid can be quickly filled into the chamber where the moving iron core 42 is located through the first balance hole 16 and the third balance hole 422, or the fluid in the chamber where the moving iron core 42 is located can be quickly discharged, reducing the response time of the solenoid valve 1 to open and / or close the valve. This allows the force exerted by the fluid in the fluid chamber 301 on the valve core assembly 20 to be completely or partially offset by the force exerted by the working fluid in the chamber where the moving iron core 42 is located on the valve core assembly 20, thus reducing the driving force required by the solenoid valve.

[0048] like Figure 7 As shown, the solenoid valve 1 in this embodiment of the invention may not have a housing 50, and Figure 7 The solenoid valve 1 shown can be sold separately. Figure 7 The solenoid valve 1 shown can be installed into the housing 50. To prevent the valve stem 10 and the moving iron core 42 from detaching from the drive housing 47, and to ensure the integrity of the product during transportation, [further details are needed]. Figures 7 to 10 As shown, in some embodiments, the valve seat 30 includes a housing portion 31 and a stop portion 32. The housing portion 31 has a fluid cavity 301, and the stop portion 32 is located in the fluid cavity 301. The stop portion 32 and the housing portion 31 are integrally formed or fixedly connected. The valve stem 10 also includes a flange portion 15. Along the axial direction of the valve stem 10, the flange portion 15 is located on the side of the stop portion 32 away from the first limiting portion 11. The projection of the stop portion 32 on the flange portion 15 is located inside the flange portion 15. The flange portion 15 can abut against the stop portion 32, which helps to ensure the integrity of the product during transportation.

[0049] when Figure 7 When the solenoid valve 1 described in the embodiment is installed in the housing 50, the housing 50 can limit the valve stem 10 and the moving iron core 42. In order to avoid the stop part 32 affecting the movement of the valve stem 10, in some embodiments, there is a gap between the flange part 15 and the stop part 32 during the movement stroke of the solenoid valve 1 in the working state.

[0050] Furthermore, such as Figures 1 to 3 , Figure 11 and Figure 12 As shown, the solenoid valve 1 of this embodiment may further include a first sealing ring 351 and a second sealing ring 352. Along the radial direction of the solenoid valve, the first sealing ring 351 and the second sealing ring 352 are sandwiched between the valve seat 30 and the housing 50. The first sealing ring 351 and the second sealing ring 352 are arranged at intervals along the axial direction of the solenoid valve 1. The height of the second channel 104 is located between the height of the first sealing ring 351 and the height of the second sealing ring 352. In a specific implementation, at least one of the valve seat 30 and the housing 50 may include a mounting groove, and the first sealing ring 351 and the second sealing ring 352 are positioned within the corresponding mounting groove.

[0051] Please refer to further information. Figures 8 to 10 The valve seat 30 has a communicating channel 37 that penetrates the side wall of the valve seat 30. The communicating channel 37 communicates with the second channel 104. The valve seat 30 may also have a reinforcing rib 34 located on the outer surface of the housing portion 31 to increase the structural strength of the valve seat 30.

[0052] To achieve the connection between the valve seat 30 and the drive housing 47, the valve seat 30 may include a limiting part 36 protruding from the housing part 31. The drive housing 47 may have a mating groove, and the limiting part 36 is embedded in the mating groove to limit the valve seat 30 and the drive housing 47. The drive housing 47 includes a mounting part 471, and a metal nut structure may be provided inside the mounting part 471. Threaded fasteners are fitted inside the mounting part 471 to connect the drive housing 47 and the housing 50.

[0053] In summary, according to the solenoid valve 1 provided by this application, the valve core assembly 10 is sleeved on the outer periphery of a portion of the valve stem 10. The support member 23 of the valve core assembly 20 is supported between the first valve core member 21 and the second valve core member 22. By setting the elastic fastener 24 on the side of the second valve core member 22 away from the first valve core member 21, and the elastic fastener 24 abutting against the second limiting part 12, the elastic fastener 24 can fasten the first valve core member 21, the support member 23, and the second valve core member 22 between the first limiting part 11 and the second limiting part 12. During the assembly of the first valve core member 21 and the second valve core member 22 with the valve stem 10, under the action of the support member 23 and the elastic fastener 24, they have good coaxiality with the valve stem 10, which helps to reduce the deformation of the valve stem 10 or avoid the deformation of the valve stem 10, and is beneficial to improving the sealing effect of the first valve core member 21 and the second valve core member 22.

[0054] It should be noted that the above-described embodiments only illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be pointed out that those skilled in the art can make several modifications without departing from the concept of this invention, and these modifications all fall within the protection scope of this invention.

Claims

1. A solenoid valve (1), characterized in that, The solenoid valve (1) includes a valve stem (10) and a valve core assembly (20). The valve stem (10) is movable along the axial direction of the solenoid valve (1). The valve stem (10) has a first limiting part (11) and a second limiting part (12). The valve core assembly (20) is sleeved on a portion of the outer periphery of the valve stem (10). Along the axial direction of the valve stem (10), the valve core assembly (20) is limited between the first limiting part (11) and the second limiting part (12). The valve core assembly (20) includes a first valve core (21), a second valve core (22), a support member (23), and an elastic fastener (24). Along the axial direction of the valve core assembly (20), at least a portion of the support member (23) is supported between the first valve core (21) and the second valve core (22). The elastic fastener (24) is located on the side of the second valve core (22) away from the first valve core (21), and the elastic fastener (24) abuts against the second limiting portion (12).

2. The solenoid valve (1) according to claim 1, characterized in that, The second limiting part (12) has a limiting groove (121), and the elastic fastener (24) includes a spring piece part (240). A portion of the spring piece part (240) is located in the limiting groove (121), and the spring piece part (240) abuts against the groove wall defining the limiting groove (121). The spring piece part (240) is an annular structure, or the spring piece part (240) includes at least two bullet pieces (241) spaced apart circumferentially along the spring piece part (240). The spring piece (240) is interference-fitted with the second limiting part (12).

3. The solenoid valve (1) according to claim 2, characterized in that, The second limiting part (12) further includes an enlarged diameter part (122), which defines a portion of the groove wall of the limiting groove (121). The enlarged diameter part (122) is located on the side of the elastic fastener (24) away from the second valve core (22). The outer peripheral surface of the enlarged diameter part (122) includes a conical surface. Along the direction from the elastic fastener (24) to the enlarged diameter part (122), the circumferential dimension of the enlarged diameter part (122) increases. And / or, the enlarged diameter portion (122) includes a hot riveting structure.

4. The solenoid valve (1) according to claim 2, characterized in that, The elastic fastener (24) includes a plate portion (242) and at least two bullet pieces (241) arranged circumferentially spaced along the plate portion (242). The bullet piece portion (240) is fixedly connected to the plate portion (242). The plate portion (242) is directly or indirectly limited by the second valve core (22). The bullet piece (241) is located on the side of the plate portion (242) away from the second valve core (22). The bullet piece (241) is bent from the plate portion (242) in a direction away from the second valve core (22). The material of the resilient fastener (24) includes metal; Along the inner edge of the plate portion (241) pointing towards the center line of the plate portion (241), the arc length of the bullet piece (241) increases.

5. The solenoid valve (1) according to any one of claims 1 to 4, characterized in that, The support member (23) includes a first support portion (231), a second support portion (232), and a connecting portion (235). The first support portion (231) abuts against the first valve core (21), and the second support portion (232) abuts against the second valve core (22). Along the axial direction of the support member (23), the connecting portion (235) is located between the first support portion (231) and the second support portion (232). The projection of the connecting portion (235) onto the first support portion (231) is located within the first support portion (231), and the projection of the connecting portion (235) onto the second support portion (232) is located within the second support portion (232). The first support portion (231) abuts against the first valve core (21), and the orthographic projection of the outer peripheral surface of the first valve core (21) onto the first support portion (231) is located within the first support portion (231), or the orthographic projection of the outer peripheral surface of the first valve core (21) onto the first support portion (231) coincides with the outer peripheral surface of the first support portion (231), and / or, the orthographic projection of the outer peripheral surface of the second valve core (22) onto the second support portion (232) is located within the second support portion (232), or the orthographic projection of the outer peripheral surface of the second valve core (22) onto the second support portion (232) coincides with the outer peripheral surface of the second support portion (232).

6. The solenoid valve (1) according to claim 5, characterized in that, The first valve core (21) abuts against the first limiting part (11), the elastic fastener (24) abuts against the second valve core (22), or the valve core assembly (20) further includes a gasket (25), the gasket (25) abuts against the end face of the second valve core (22) away from the support member (23), and the elastic fastener (24) abuts against the gasket (25); Alternatively, the support member (23) may further include a third support portion (233) and a fourth support portion (234), wherein the third support portion (233) is disposed abutting between the first limiting portion (11) and the first valve core member (21), and the fourth support portion (234) is disposed abutting between the second valve core member (22) and the elastic fastener (24).

7. The solenoid valve (1) according to claim 6, characterized in that, The first valve core (21) abuts against the first limiting part (11), the first valve core (21) has a first groove (211), at least a portion of the first limiting part (11) is embedded in the first groove (211), the first limiting part (11) is press-fitted with the first valve core (21), the first valve core (21) includes a first sealing surface (212), the first sealing surface (212) includes a conical surface, and the first sealing surface (212) is disposed adjacent to the side wall surface defining the first groove (211); And / or, the valve core assembly (20) further includes a gasket (25), the second valve core (22) having a second groove (221), at least a portion of the gasket (25) being embedded in the second groove (221), the second valve core (22) being press-fitted with the gasket (25), the second valve core (22) including a second sealing surface (222), the second sealing surface (222) including a conical surface, the second sealing surface (222) being disposed adjacent to the sidewall surface defining the second groove (221).

8. The solenoid valve (1) according to any one of claims 1 to 7, characterized in that, The valve stem (10) further includes a small-diameter portion (13) along the axial direction of the valve stem (10). The small-diameter portion (13) is located between the first limiting portion (11) and the second limiting portion (12). At least a portion of the projection of the small-diameter portion (13) onto the first limiting portion (11) is located within the first limiting portion (11). At least a portion of the valve core assembly (20) is sleeved on the outer surface side of the small-diameter portion (13). The first valve core (21) and the second valve core (22) are both interference-fitted with the small diameter portion (13), and the support member (23) is clearance-fitted with the small diameter portion (13).

9. The solenoid valve (1) according to any one of claims 1 to 7, characterized in that, The solenoid valve (1) further includes a stationary iron core (41), a moving iron core (42), and a valve seat (30). The valve seat (30) has a first valve port (101). A portion of the valve stem (10) is sleeved on the inner surface of the valve seat (30). Along the axial direction of the solenoid valve (1), the first valve core (21) is located on the side of the valve seat (30) away from the moving iron core (42). The first valve core (21) can abut against the wall that defines the first valve port (101). The moving iron core (42) can move towards or away from the stationary iron core (41). A portion of the valve stem (10) is sleeved on the outer periphery of a portion of the moving iron core (42), and the valve stem (10) and the moving iron core (42) are sealed together, or the valve stem (10) and the moving iron core (42) are an integral structure. The solenoid valve (1) further includes a first seal (46) located radially between the valve stem (10) and the valve seat (30).

10. The solenoid valve (1) according to claim 9, characterized in that, The valve seat (30) includes a housing portion (31) and a stop portion (32). The housing portion (31) has a fluid cavity (301). The stop portion (32) is located in the fluid cavity (301). The stop portion (32) and the housing portion (31) are integral or fixedly connected. The valve stem (10) also includes a flange portion (15). Along the axial direction of the valve stem (10), the flange portion (15) is located on the side of the stop portion (32) away from the first limiting portion (11). The projection of the stop portion (32) on the flange portion (15) is located inside the flange portion (15). The flange portion (15) can abut against the stop portion (32). During the movement stroke of the solenoid valve (1) in the working state, there is a gap between the flange portion (15) and the stop portion (32). And / or, the solenoid valve (1) further includes an isolation sleeve (45) and a magnetic conductor (44), the isolation sleeve (45) including a first part (451) and a second part (452), the inner diameter of the second part (452) being larger than the inner diameter of the first part (451), the second part (452) being sealed to the valve seat (30), at least a portion of the moving iron core (42) being sleeved on the inner surface side of the isolation sleeve (45), the stationary iron core (41) being located outside the isolation sleeve (45), the valve stem (10) having a first balance hole (16), the moving iron core (42) having a second balance hole (421) and The third balance hole (422) is connected to the first balance hole (16), the second balance hole (421) and the third balance hole (422). The first balance hole (16) passes through the axial end of the valve stem (10), the second balance hole (421) passes through the axial end of the moving iron core (42), and the third balance hole (422) passes through the side wall of the moving iron core (42). The third balance hole (422) is located close to the valve stem (10) and during the movement stroke of the moving iron core (42) in the working state, at least a portion of the third balance hole (422) is directly opposite to the second portion (452).

11. The solenoid valve (1) according to claim 9, characterized in that, The solenoid valve (1) also has a housing (50) having a second valve port (102). Along the axial direction of the solenoid valve (1), the valve core assembly (20) is located between the first valve port (101) and the second valve port (102), and the second valve core (22) is capable of abutting against the second valve port (102). The housing (50) has a first channel (103), a second channel (104) and a third channel (105). The first channel (103), the second channel (104) and the third channel (105) all have a through port on the inner wall of the housing (50). The first channel (103) can communicate with the second channel (104) through the first valve port (101), and the first channel (103) can communicate with the third channel (105) through the second valve port (102).

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