Electromagnetic valve applied to air spring

Abstract

The utility model provides an electromagnetic valve applied to an air spring, which relates to the technical field of electromagnetic valves, and comprises a shell, a connector and a valve seat, a coil assembly and an armature are arranged in the shell, the lower end of the armature is connected with a connecting rod, the lower end of the connecting rod is connected with a piston assembly, and the valve seat is provided with a valve cavity and a valve port communicated with the valve cavity; the lower end of the connecting rod is connected with a piston body used for opening and closing the valve port, a dynamic seal is arranged between the radial periphery of the piston body and the inner wall of the valve cavity and comprises sealing rings and guide rings, and the sealing rings and the guide rings are arranged at intervals in the axial direction and sealed between the radial outer wall of the piston body and the radial inner wall of the valve cavity. Or the guide rings are tightly arranged and sealed between the radial outer wall of the piston body and the radial inner wall of the valve cavity in the radial direction, and when the guide rings are arranged in the radial direction, the guide rings are located at the radial outer ends of the sealing rings. The electromagnetic valve applied to the air spring is simple in sealing structure, high in response speed and low in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, and in particular to a solenoid valve applied to an air spring. Background Art

[0002] At present, solenoid valves are often used in automobile air springs. They control the opening and closing of the valve by converting electrical signals into mechanical actions, isolating or connecting two chambers, thereby changing the air capacity in the air spring and achieving the purpose of changing the spring stiffness.

[0003] Air springs can adjust the height of the vehicle body and the hardness of the suspension. For example, lower the vehicle body when getting on or off the vehicle, and raise the vehicle body to improve passability when encountering complex roads. Only air springs with double chambers or above can adjust the hardness of the suspension through air springs, while single chamber air springs can only adjust the hardness of the suspension through shock absorbers. The solenoid valve involved in this application is the pneumatic solenoid switch valve that controls the on / off of the air chamber mentioned above.

[0004] In the prior art solenoid valve structure, the dynamic sealing structure between the piston and the valve cavity includes a sealing body made of elastic material, two axially spaced radially outer sealing lips and two axially spaced radially inner sealing lips; in addition, a support body capable of carrying the sealing body is required; the support body is composed of a harder material than the sealing body, and has a radially exposed portion extending axially between the two sealing lips, and serves as a guide portion having an axial guiding function for the movable part. In order to achieve a sealing effect when the central axis moves axially relative to the fixed part, this type of structure will be designed in the form of an assembly, and the outer cylindrical surface of the assembly is a harder engineering plastic material, and needs to be indirectly fixed by an interference fit with the fixed part. The above-mentioned dynamic sealing assembly has a complex structure, and the elastic sealing body needs to be vulcanized on the plastic support body, and the plastic support body needs to be designed with a flow channel required for the vulcanization process. The manufacturing process is complicated. At the same time, in order to achieve the sealing function, not only two axially spaced radially outward sealing lips are required, but also two axially spaced radially inward sealing lips are required, which has a complex structure and high manufacturing cost. Summary of the invention

[0005] In order to overcome at least one of the above defects in the prior art, the utility model provides a solenoid valve applied to an air spring, which has a simple sealing structure, a fast response speed and a low manufacturing cost.

[0006] The utility model provides a solenoid valve applied to an air spring: comprising a shell, a connector and a valve seat, the upper and lower ends of the shell are respectively connected to the outside of the connector and the valve seat, a coil assembly and an armature slidably mounted on the coil assembly along the axial direction are arranged in the shell, the lower end of the armature is connected to a connecting rod, the lower end of the connecting rod is connected to a piston body, a valve cavity and a valve port connected thereto are opened on the valve seat; the lower end of the connecting rod is connected to a piston body for opening and closing the valve port, a dynamic seal is arranged between the radial outer periphery of the piston body and the inner wall of the valve cavity, the dynamic seal comprises a sealing ring and a guide ring, the sealing ring and the guide ring are arranged in an axially spaced manner to seal between the radial outer wall of the piston body and the radial inner wall of the valve cavity.

[0007] Compared with the prior art, the solenoid valve applied to the air spring of the utility model has the following advantages:

[0008] Compared with the traditional lip seal type dynamic seal, the solenoid valve structure applied to the air spring of the utility model is realized by the cooperation of a simple sealing ring and a PTF guide ring, which simplifies the structure of the original dynamic seal component and simplifies the process of the interference fit between it and the inner wall of the sleeve, effectively reducing the production cost; in addition, in the structure of the present application, the friction resistance of the piston body lifting and lowering is effectively reduced through the combination of the sealing ring and the guide ring, thereby improving the response speed.

[0009] Further, when the sealing ring and the guide ring are arranged in an axially spaced manner to seal between the radial outer wall of the piston body and the radial inner wall of the valve cavity, the sealing ring is a special-shaped sealing ring or a star-shaped sealing ring.

[0010] Furthermore, two first lip edges are provided on the radial inner side of the special-shaped sealing ring, and two second lip edges are provided on the radial outer side of the special-shaped sealing ring. The two first lip edges and each adjacent first lip edge and second lip edge are transitioned by a concave arc surface, and the two second lip edges are transitioned by a V-shaped groove, so that the protruding length of the two second lip edges is greater than the protruding length of the two first lips.

[0011] As an improvement, the piston body is integrally injection molded at the lower end of the connecting rod or connected to the lower end of the connecting rod by press fitting, and a sealing assembly is connected to the piston body for sealing the valve port and for buffering the impact force at the return end of the piston body.

[0012] As a structural form, the sealing assembly includes a sealing body connected to the lower end of the piston body by a vulcanization process, and the lower end of the sealing body forms a sealing plane for sealing the valve port; the upper end surface of the sealing body is convexly formed with a plurality of circumferentially distributed limiting protrusions, and a limiting step is also provided on the valve seat. When the piston body moves upward to the limit position, the upper end surfaces of the plurality of limiting protrusions abut against the lower end surface of the limiting step.

[0013] Further improved, the valve seat includes an axially connected magnetic conductive tube and a base, the upper end of the magnetic conductive tube is mounted on the open end of the guide sleeve, and the lower end of the magnetic conductive tube is provided with a concave upper cavity; the middle part of the upper end of the base is concave to form a lower cavity, and the lower cavity and the upper cavity combine to form the valve cavity, and the lower end surface of the magnetic conductive tube and the inner wall of the lower cavity form the limiting step.

[0014] As another structural form, the sealing assembly includes a sealing body and a buffer component, the sealing body is connected to the lower end of the piston body by rubber coating through a vulcanization process, and the lower end of the sealing body forms a sealing plane for sealing the valve port; the buffer component is connected to the top wall of the valve cavity and / or the upper end face of the piston body.

[0015] As a further improvement, a guide sleeve with its opening facing downward is installed in the inner hole of the coil assembly, the armature is slidably installed in the guide sleeve, and a PTFE coating is provided on the radial outer peripheral wall of the armature.

[0016] In addition, the utility model also provides another structural form of an electromagnetic valve applied to an air spring, including a shell, a connector and a valve seat, the upper and lower ends of the shell are respectively connected to the outside of the connector and the valve seat, a coil assembly and an armature axially slidably mounted on the coil assembly are arranged in the shell, the lower end of the armature is connected to a connecting rod, the lower end of the connecting rod is connected to a piston body, a valve cavity and a valve port connected thereto are opened on the valve seat; the lower end of the connecting rod is connected to a piston body for opening and closing the valve port, a dynamic seal is arranged between the radial outer periphery of the piston body and the inner wall of the valve cavity, the dynamic seal includes a sealing ring and an auxiliary sealing ring, the sealing ring and the auxiliary sealing ring are radially arranged tightly to seal between the radial outer wall of the piston body and the radial inner wall of the valve cavity, and when radially arranged, the auxiliary sealing ring is located at the radial outer end of the sealing ring.

[0017] Other improved features and advantages of the utility model will be described in the subsequent specific embodiments, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of the electromagnetic valve applied to the air spring of the utility model;

[0019] Figure 2 It is a cross-sectional view of the first embodiment of the solenoid valve applied to the air spring of the utility model;

[0020] Figure 3 This is a schematic diagram of the connection structure between the wiring terminal and the coil assembly in the utility model;

[0021] Figure 4 This is a cross-sectional view from another angle of the solenoid valve applied to the air spring of the utility model; (mainly showing the connection structure between the wiring terminal and the coil assembly)

[0022] Figure 5 It is a schematic diagram of the structure of the coil skeleton in the utility model;

[0023] Figure 6 The dynamic sealing structure and the sealing assembly structure in the first embodiment of the utility model;

[0024] Figure 7 It is a partial cross-sectional view of the second embodiment of the electromagnetic valve applied to the air spring of the utility model;

[0025] Figure 8 A partial cross-sectional view of a third embodiment of the electromagnetic valve applied to an air spring of the utility model;

[0026] Fig. 9 It is a cross-sectional view of the special-shaped sealing ring in the utility model.

[0027] Description of reference numerals:

[0028] 1. Shell; 2. Connector; 3. Armature; 4. Connecting rod; 5. Terminal block; 6. Connector; 7. Coil skeleton; 8. Copper wire; 9. Winding post; 10. Positioning slot; 11. Bending clamping part; 12. Notch; 13. Guide sleeve; 14. Magnetic cover plate; 15. Permanent magnet; 16. Piston body; 17. Sealing ring; 18. Guide ring; 19. Sealing assembly; 20. Limiting protrusion; 21. Limiting step; 22. Magnetic tube; 23. Base; 24. Upper concave cavity; 25. Lower concave cavity; 26. Elastic element; 27. Pre-tightening protrusion; 28. Positioning plug; 29. ​​Buffer; 30. Auxiliary sealing ring; 31. First lip edge; 32. Second lip edge. DETAILED DESCRIPTION

[0029] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0030] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "fixed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0031] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0032] See also Figure 1 to Figure 6 As shown, an embodiment of the present application discloses a solenoid valve applied to an air spring, comprising a shell 1, a connector 2 and a valve seat, wherein the upper and lower ends of the shell 1 are respectively connected to the outside of the connector 2 and the valve seat, thereby fixing the connector 2 and the valve seat. Specifically, a clamping step is provided on the outer peripheral wall of the connector 2 and the base 23, and a clamping portion bent radially inward is provided on the upper and lower ends of the shell 1, and the clamping portions at both ends are respectively mounted on the clamping steps of the connector 2 and the base 23.

[0033] In addition, in this embodiment, see the attached Figure 2 A coil assembly and an armature 3 slidably mounted in the coil assembly along the axial direction are arranged in the housing 1, a connecting rod 4 is connected to the lower end of the armature 3, a piston assembly is connected to the lower end of the connecting rod 4, a valve port is opened on the valve seat, the armature 3 is lifted and lowered in the coil assembly to drive the connecting rod 4 to lift and lower together with the piston assembly to realize the opening and closing of the valve port; a terminal 5 is arranged on the connector 2, the lower end of the terminal 5 is connected to the coil assembly, and the upper end of the terminal 5 is exposed on the upper end face of the connector 2; the lower end of the connector 2 extends downward along the axial direction to be close to the lower end face of the coil assembly, the connector 2 is an integrated structure that is overmolded on the outside of the coil assembly and the terminal 5, and the upper end face of the connector 2 is integrally formed with an interface 6 that surrounds the exposed part of the terminal 5.

[0034] In the structure of this embodiment, the components of the traditional solenoid valve are structurally changed, with emphasis on the design and addition of a plastic coating process after the copper wire 8 is wound and the terminal 5 is inserted, that is, the coil assembly, the terminal 5 and the connector 2 are integrated by injection molding, and the external interface 6 (wiring harness interface) is manufactured by the plastic coating process; thereby, the tightness and structural strength of the original structure are enhanced, and at the same time, through the protection of the plastic coating wall thickness, the ability of the solenoid valve to resist external pollution is increased, especially the protection of the copper wire 8 part of the coil assembly and the corrosion resistance of the terminal 5 is improved.

[0035] Preferably, continue to participate in the attached Figure 2 , 3 and 4, the coil assembly includes a coil skeleton 7 and a copper wire 8 wound on the outside of the coil skeleton 7, and a winding post 9 is provided at the upper end of the coil skeleton 7, the end of the copper wire 8 is tautly wound on the winding post 9, and connected to the lower end of the terminal 5. Specifically, the terminal 5 includes positive and negative pole plug-in posts, and the winding post 9 is also two groups, each group of winding posts 9 includes two columns, and a notch 12 is left between the two columns, and when the end of the copper wire 8 is horizontally wound around the winding post 9, a horizontal copper wire 8 group is formed in the notch 12, and the bending clamping part 11 is clamped on the outside of the horizontal copper wire 8 group, and the bending clamping part 11 is fixed to the horizontal copper wire 8 group by resistance welding, so that the lower ends of the positive and negative pole plug-in posts are respectively connected to the two horizontal copper wire 8 groups, and the connection here includes both It not only includes mechanical structure connection, but also realizes conductive connection; more specifically, two positioning slots 10 are provided at the upper end of the coil skeleton 7 near the winding post 9, and the lower ends of the positive and negative pole plug-in posts of the terminal block 5 are respectively inserted and positioned in the two positioning slots 10; the lower ends of the positive and negative pole plug-in posts of the terminal block 5 are also respectively provided with bending clamping parts 11, and the two bending clamping parts 11 are respectively clamped on the outside of the two horizontal copper wires 8 groups, and the bending clamping parts 11 and the horizontal copper wires 8 groups are connected and fixed by resistance welding.

[0036] In the above structure of the present application, a winding post 9 is provided on the coil frame 7, so that the copper wire 8 has a reliable and stable wire tension after being wound on the winding post 9. At the same time, a positioning slot 10 is provided on the coil frame 7 to achieve reliable assembly of the lower end of the terminal 5 in the positioning slot 10. See the attached Figure 4 ; The above two points provide a reliable relative position for the bending action of the welding type terminal 5, and the clamping of the bending clamping portion 11 and the resistance welding realize the reliable connection between the terminal 5 and the horizontal copper wire 8 group; in this structure, the lower end of the terminal 5 and the positioning slot 10 adopt an interference fit, which is conducive to further maintaining the posture of the entire terminal 5, reducing the relative displacement between the welding point and the copper wire 8 in the application environment, and improving the connection reliability.

[0037] On the other hand, participating in Figure 2It can be seen that the inner hole of the coil assembly is equipped with a guide sleeve 13 with an opening facing downward, the armature 3 is slidably mounted in the guide sleeve 13, and a PTFE coating is provided on the radial outer peripheral wall of the armature 3. The present application further enhances the surface wear resistance of the armature 3 under axial reciprocating motion by adding a PTFE coating to the outer peripheral wall of the armature 3. At the same time, the PTFE coating is thinner in form, which is conducive to improving the magnetic conductivity efficiency of the solenoid valve and the electromagnetic force. In addition, the bonding force of the coating is stable and consistent, and the potential risk of installation defects during installation and use is low, and the reliability is stronger.

[0038] On the other hand, the PTFE coating plays a lubricating role to a certain extent, reducing the friction coefficient between the armature 3 and the inner wall of the guide sleeve 13. From another perspective, it can improve the response speed of the entire solenoid valve.

[0039] In addition, referring to the attached drawings, a magnetic cover plate 14 is provided between the top wall of the coil assembly and the connector 2, a through hole is provided in the middle of the magnetic cover plate 14 and is sleeved on the outside of the guide sleeve 13, and at least two groups of permanent magnets 15 evenly distributed along the circumferential direction are embedded on the inner wall of the through hole. Preferably, two arc-shaped embedding grooves are symmetrically provided on the inner hole wall of the magnetic cover plate 14, and two permanent magnets 15 are embedded in each embedding groove, see the attached drawings. Figure 4 Specifically, the permanent magnet is also an arc-shaped structure, similar to a tile structure. The upper limit of the electromagnetic force of the solenoid valve is constrained by the fixed assembly size and the outer diameter of the coil. The present application uses a design in which a tile-type permanent magnet 15 is installed in a slot in the magnetic conductive cover plate 14, thereby effectively improving the magnetic conductivity of the solenoid valve without changing the spatial size.

[0040] In this embodiment, see the attached Figure 6 The piston assembly includes a piston body 16, a dynamic seal is arranged between the radial outer periphery of the piston body 16 and the inner wall of the valve cavity of the valve seat, the piston body 16 is integrally injection molded at the lower end of the connecting rod 4, and a sealing assembly 19 is arranged at the position corresponding to the valve port at the lower end of the piston body 16. Preferably, the dynamic seal includes a sealing ring 17 and a guide ring 18, and the sealing ring 17 and the guide ring 18 are axially spaced and slidably arranged between the radial outer wall of the piston body 16 and the radial inner wall of the valve cavity. Referring to the accompanying drawings, two axially spaced sealing grooves are provided on the outer peripheral wall of the piston body 16, and the sealing ring 17 and the guide ring 18 are respectively snap-fitted into the upper and lower sealing grooves, and the sealing ring 17 here is preferably a special special-shaped sealing ring, which can also be replaced by a star-shaped special-shaped sealing ring.

[0041] In this structure, the guide ring 18 is made of PTFE material, and for the convenience of installation, an inclined opening is provided in the middle of the guide ring 18, and the opening passes through the guide ring 18 axially. In this structure, the guide ring 18 mainly plays a guiding and supporting role.

[0042] In addition, the special-shaped sealing ring refers to the cross section of the sealing ring 17 being an unconventional special-shaped structure, see the attached Fig. 9 , two first lips 31 are arranged on the radial inner side of the special-shaped sealing ring, and two second lips 32 are arranged on the radial outer side of the special-shaped sealing ring. The two first lips 31 and the adjacent first lips 31 and second lips 32 are transitioned by an inwardly concave arc surface, and the two second lips 32 are transitioned by a V-shaped groove, so that the outward protrusion length of the two second lips 32 is greater than the outward protrusion length of the two first lips 31. Specifically, the radial inner part is similar to the structure of a conventional star-shaped sealing ring, and the radial outer side and the dynamic sealing half of the inner wall of the valve cavity are a K-type structure; that is, there are two sealing lips with a V-shaped angle on the radial outer side of the special-shaped sealing ring. The characteristics of this structure are: a grease storage cavity is formed in the angle inner cavity, and the longer sealing lip has more wear margin than the structure of the conventional star-shaped sealing ring; and this structure has a small relative contact area during dynamic sealing, thereby reducing friction resistance and ensuring a better dynamic response speed, so that the dynamic seal can ensure a balance between durability and fast response performance.

[0043] In this embodiment, the simple special-shaped sealing ring 17 is matched with the PTF guide ring 18, which simplifies the structure of the traditional dynamic seal, simplifies the process of the interference fit between the special-shaped sealing ring 17 and the inner wall of the sleeve, and effectively reduces the production cost.

[0044] In the above structure of the present embodiment, an engineering plastic piston body 16 is used to replace the conventional aluminum piston body 16, and the piston body 16 is overmolded on the copper connecting rod 4 by using the injection molding process, which replaces the press-fitting process of the piston body 16 and the connecting rod 4 in the prior art, thereby simplifying the assembly steps; and the integrated overmolding structure has a more reliable structural strength compared to the original interference fit combination, and improves the problem of contaminants caused by press-fitting debris during the press-fitting process.

[0045] In addition, in this embodiment, continue to refer to the attached Figure 6 It can be seen that the sealing component 19 is connected to the lower end of the piston body 16 by rubber coating through a vulcanization process, and the lower end of the end face seal forms a sealing plane for sealing the valve port. The upper end face of the sealing component 19 is convexly formed with a plurality of limit protrusions 20 distributed along the circumferential direction, and a limit step 21 is also provided on the valve seat. When the piston assembly moves upward to the limit position, the upper end faces of the plurality of limit protrusions 20 abut against the lower end faces of the limit steps 21. In this structure, the end face seal is coated on the plastic piston end face by a vulcanization process, the vulcanized lower surface is used for the end face seal, and the vulcanized upper surface is a protruding 4-6 limit protrusions 20, preferably a special-shaped triangular protrusion, which buffers the impact force at the end of the piston return stroke and cuts off the piston return stroke movement; at the same time, the number of parts is reduced and the assembly process is simplified.

[0046] In the above structure, before the top of the piston body 16 reaches the top of the valve chamber, multiple limit bumps 20 first abut against the limit steps 21, which not only serves to mitigate the impact force at the end of the return stroke of the piston body 16, but also cuts off the piston body 16 from resetting to the extreme position, thereby avoiding rigid contact between the top of the piston body 16 and the top wall of the valve chamber.

[0047] The valve seat includes an axially connected magnetic tube 22 and a base 23. The upper end of the magnetic tube 22 is mounted on the open end of the guide sleeve 13, and the lower end of the magnetic tube 22 is provided with an inwardly concave upper cavity 24; the middle part of the upper end of the base 23 is inwardly concave to form a lower cavity 25, and the lower cavity 25 and the upper cavity 24 form a valve cavity, and the lower end surface of the magnetic tube 22 and the inner wall of the lower cavity 25 form a limiting step 21, and the base 23 is provided with an inlet and an outlet respectively connected to the valve cavity; the lower end of the connecting rod 4 slides through the magnetic tube 22 and extends into the valve cavity, and an elastic element 26 is provided between the upper end of the magnetic tube 22 and the lower end of the armature 3.

[0048] On the other hand, in the present embodiment, a plurality of outwardly protruding pre-tightening bosses 27 are formed at the bottom of the coil skeleton 7, and the lower ends of the plurality of pre-tightening bosses 27 are cones with gradually decreasing diameters. When the coil assembly and the outer shell 1 are installed, the plurality of pre-tightening bosses 27 can play the role of axial pre-tightening force, thereby preventing the force from being transmitted to the copper wire 8 when installing the outer shell 1 and affecting its performance.

[0049] In addition, in the above structure, at least one positioning pin 28 is protrudingly formed at the bottom of the coil skeleton 7, and correspondingly, a positioning hole for the positioning pin 28 to be inserted and matched is provided on the end face of the magnetic tube 22 that abuts against the coil skeleton 7, so as to ensure the stability of the coil skeleton 7 after connection and prevent circumferential rotation. Example

[0050] See attached Fig. 9 The general structure of this embodiment is the same as that of the first embodiment, and the only difference is that the dynamic seal in this embodiment includes a sealing ring 17 and an auxiliary sealing ring 30. The sealing ring 17 and the auxiliary sealing ring 30 are arranged radially and tightly to seal between the radial outer wall of the piston body 16 and the radial inner wall of the valve cavity, and the auxiliary sealing ring 30 is located at the radial outer end of the sealing ring. In this structure, the auxiliary sealing ring 30 needs to play a sealing role, and also play a role in reducing friction resistance and improving response speed. The auxiliary sealing ring 30 here is a sealing ring with FTFE material added, and it is a complete annular structure. The FTFE material has a low friction coefficient and strong wear resistance. In addition, the main material is still rubber material, that is, the auxiliary sealing ring 30 has a certain elastic deformation performance, which is convenient for it to be installed in the sealing groove.

[0051] Specifically, a sealing groove is opened on the outer wall of the piston body 16, the sealing ring 17 is arranged on the radial inner side, the auxiliary sealing ring 30 is arranged on the radial outer side, and the inner wall of the sealing ring 17 is sealed with the radial inner wall of the sealing groove, the outer wall of the sealing ring 17 is sealed with the inner wall of the auxiliary sealing ring 30, and the outer wall of the auxiliary sealing ring 30 is sealed with the inner wall of the valve cavity; in this structure, an arc-shaped groove is provided on the side where the auxiliary sealing ring 30 is in contact with the sealing ring 17, so as to better ensure that the sealing ring 17 is stable in the center position in the axial direction. Example

[0052] See attached Figure 8 This embodiment is improved on the basis of the embodiment one or the embodiment two, and most of its structures are the same as those of the embodiment one or the embodiment two. The only difference is that the structure of the sealing component 19 is changed in this embodiment. Specifically, the structure of the limiting protrusion 20 for the end face seal to play a buffering role is designed separately from the end face seal. That is, at the lower end of the piston body 16, only the sealing component 19 that is vulcanized and rubber-coated to cooperate with the valve port is required, and the buffer structure is arranged between the top of the piston body 16 and the top wall of the valve cavity, specifically, an annular buffer 29 is embedded on the top wall of the upper concave cavity 24 of the magnetic conductive tube 22. The structure of the attached figure only shows the structure that has been changed on the basis of the embodiment three, and does not reflect the structure that has been changed on the basis of the embodiment one.

[0053] In this structure, when the sealing ring 17 and the guide ring 18 are arranged in an axially spaced arrangement, since two sealing grooves need to be opened on the outer wall of the piston body 16, the thickness ratio of the buffer 29 installed on the top of the piston body 16 will be insufficient. At this time, the buffer 29 is selected to be embedded in the top wall of the upper concave cavity 24; of course, if conditions permit, the buffer 29 can also be embedded in the upper end face of the piston body 16.

[0054] When the sealing ring 17 and the guide ring 18 are arranged radially, the thickness of the buffer 29 on the top of the piston body 16 is usually sufficient, so the buffer 29 is preferably embedded in the upper end surface of the piston body 16; of course, it can also be embedded in the top wall of the upper cavity 24.

[0055] In the description of the present application, the description with reference to the terms "present embodiment", "some embodiments", etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other.

[0056] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A solenoid valve for an air spring, comprising a housing (1), a connector (2) and a valve seat, wherein the upper and lower ends of the housing (1) are respectively connected to the outside of the connector (2) and the valve seat, wherein a coil assembly and an armature (3) slidably mounted on the coil assembly in the axial direction are arranged in the housing (1), wherein the lower end of the armature (3) is connected to a connecting rod (4), wherein a valve cavity and a valve port communicating with the valve cavity are provided on the valve seat, wherein the lower end of the connecting rod (4) is connected to a piston body (16) for opening and closing the valve port, wherein: A dynamic seal is provided between the radial outer periphery of the piston body (16) and the inner wall of the valve chamber, and the dynamic seal comprises a sealing ring (17) and a guide ring (18). The sealing ring (17) and the guide ring (18) are arranged in an axially spaced manner to seal between the radial outer wall of the piston body (16) and the radial inner wall of the valve chamber.

2. The solenoid valve applied to the air spring according to claim 1, characterized in that: When the sealing ring (17) and the guide ring (18) are arranged in an axially spaced manner to seal between the radial outer wall of the piston body (16) and the radial inner wall of the valve chamber, the sealing ring (17) is a special-shaped sealing ring or a star-shaped sealing ring.

3. The solenoid valve applied to the air spring according to claim 2, characterized in that: Two first lip edges (31) are arranged on the radial inner side of the special-shaped sealing ring, and two second lip edges (32) are arranged on the radial outer side of the special-shaped sealing ring. The two first lip edges (31) and each adjacent first lip edge (31) and second lip edge (32) are transitioned through an inwardly concave arc surface, and the two second lip edges (32) are transitioned through a V-shaped groove, so that the outward protrusion length of the two second lip edges (32) is greater than the outward protrusion length of the two first lip edges (31).

4. A solenoid valve applied to an air spring, comprising a housing (1), a connector (2) and a valve seat, wherein the upper and lower ends of the housing (1) are respectively connected to the connector (2) and the outside of the valve seat, wherein a coil assembly and an armature (3) slidably mounted on the coil assembly in the axial direction are arranged in the housing (1), wherein the lower end of the armature (3) is connected to a connecting rod (4), wherein a valve cavity and a valve port connected thereto are provided on the valve seat, wherein the lower end of the connecting rod (4) is connected to a piston body (16) for opening and closing the valve port, wherein: A dynamic seal is provided between the radial outer periphery of the piston body (16) and the inner wall of the valve cavity, and the dynamic seal comprises a sealing ring (17) and an auxiliary sealing ring (30). The sealing ring (17) and the auxiliary sealing ring (30) are tightly arranged in the radial direction to seal between the radial outer wall of the piston body (16) and the radial inner wall of the valve cavity, and when arranged radially, the auxiliary sealing ring (30) is located at the radial outer end of the sealing ring.

5. The solenoid valve applied to an air spring according to any one of claims 1 to 4, characterized in that: The piston body (16) is integrally injection-molded at the lower end of the connecting rod (4) or connected to the lower end of the connecting rod (4) by press-fitting, and a sealing component for sealing the valve port and for buffering the impact force at the end of the return stroke of the piston body is connected to the piston body (16).

6. The solenoid valve applied to the air spring according to claim 5, characterized in that: The sealing assembly comprises a sealing body (19) which is connected to the lower end of the piston body (16) by rubber coating through a vulcanization process, and the lower end of the sealing body (19) forms a sealing plane for sealing the valve port; the upper end surface of the sealing body (19) is convexly formed with a plurality of circumferentially distributed limiting protrusions (20), and a limiting step (21) is also provided on the valve seat. When the piston body (16) moves upward to the limit position, the upper end surfaces of the plurality of limiting protrusions (20) abut against the lower end surface of the limiting step (21).

7. The solenoid valve applied to the air spring according to claim 6, characterized in that: The valve seat comprises an axially connected magnetic conductive tube (22) and a base (23); the lower end of the magnetic conductive tube (22) is provided with an inwardly concave upper cavity (24); the middle part of the upper end of the base (23) is inwardly concave to form a lower cavity (25); the lower cavity (25) and the upper cavity (24) are combined to form the valve cavity; the lower end surface of the magnetic conductive tube (22) and the inner wall of the lower cavity (25) form the limiting step (21).

8. The solenoid valve applied to the air spring according to claim 5, characterized in that: The sealing assembly comprises a sealing body (19) and a buffer component (29); the sealing body (19) is connected to the lower end of the piston body (16) by rubber coating through a vulcanization process, and the lower end of the sealing body (19) forms a sealing plane for sealing the valve port; the buffer component (29) is connected to the top wall of the valve cavity and / or the upper end surface of the piston body (16).

9. The solenoid valve applied to an air spring according to claim 1 or 4, characterized in that: A guide sleeve (13) with its opening facing downward is installed in the inner hole of the coil assembly, the armature (3) is slidably installed in the guide sleeve (13), and a PTFE coating is provided on the radial outer peripheral wall of the armature (3).

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