Air spring electromagnetic valve

Abstract

The utility model provides an air spring solenoid valve, which relates to the technical field of air spring solenoid valves and comprises a shell, a coil assembly and a valve seat, the shell is sleeved outside the coil assembly, the lower end of the shell is used for connecting and fixing the valve seat, an armature is assembled in the coil assembly in a sliding mode, and the lower end of the armature is connected with a connecting rod. A valve cavity and a valve port communicated with the valve cavity are formed in the valve seat, the lower end of the connecting rod is connected with a piston body used for opening and closing the valve port, and a dynamic seal is arranged between the radial periphery of the piston body and the inner wall of the valve cavity. The piston body is integrally formed at the lower end of the connecting rod in a plastic coating mode, and a sealing assembly used for sealing the valve port and buffering impact force at the return stroke tail end of the piston body is connected to the piston body. According to the air spring electromagnetic valve, the connecting process of the piston and the connecting rod is simple, assembly is not needed, the structural strength is high, and the pollution problem caused by press-fitting chippings is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to an air spring solenoid valve. 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 stiffness valve discussed in this patent work is the pneumatic solenoid switch valve that controls the on-off of the air chamber described above.

[0004] In the prior art air spring solenoid valve structure, the piston body is generally an aluminum part. In the connection structure of the aluminum piston and the connecting rod, it is basically assembled by partial interference fit. This type of connection method not only has an additional press-fitting step; but also the strength of the press-fitting structure is affected by the inner diameter of the piston and the outer diameter of the connecting rod, and the structural stability is difficult to ensure. In addition, the press-fitting process will produce press-fitting debris contaminants, causing the valve to get stuck. Summary of the invention

[0005] In order to overcome at least one defect in the above prior art, the utility model provides an air spring solenoid valve, which has a simple process for connecting the piston and the connecting rod, does not require assembly, has high structural strength, and improves the pollution problem caused by press-fitting debris.

[0006] The utility model provides an air spring solenoid valve: comprising a shell, a coil assembly and a valve seat, the shell is sleeved on the outside of the coil assembly, and the lower end of the shell is used for connecting and fixing the valve seat, the coil assembly is slidably equipped with an armature, the lower end of the armature is connected to a connecting rod, the valve seat is provided with a valve cavity and a valve port connected thereto, 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 piston body is integrally overmolded at the lower end of the connecting rod, and the piston body is connected to a sealing assembly for sealing the valve port and for buffering the impact force of the return end of the piston body.

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

[0008] In the air spring solenoid valve structure of the utility model, an engineering plastic piston is used to replace the original aluminum piston, and the piston is plastic-coated on the copper connecting rod by injection molding, replacing the original assembly process of pressing the two together, simplifying the assembly steps. Compared with the original interference press-fit combination, the integrated structure has a more reliable structural strength and improves the problem of contaminants caused by press-fitting debris during the press-fitting process.

[0009] Furthermore, 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 surface of the piston body.

[0010] As a structural form, the dynamic seal includes a sealing ring and a guide ring. The special-shaped sealing ring and the guide ring are arranged axially and spaced apart to seal between the radial outer wall of the piston body and the radial inner wall of the valve chamber, and the sealing ring is a special-shaped sealing ring or a star-shaped sealing ring.

[0011] 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.

[0012] As another structural form, the dynamic seal includes a sealing ring and an auxiliary sealing ring, and the sealing ring and the auxiliary sealing ring are arranged tightly along the radial direction to seal between the radial outer wall of the piston body and the radial inner wall of the valve chamber, and the auxiliary sealing ring is located at the radial outer end of the sealing ring.

[0013] As a further improvement, a guide sleeve with its opening facing downward is fitted in the inner hole of the coil assembly, the armature is slidably fitted in the guide sleeve, and a PTFE coating is provided on the radial outer peripheral wall of the armature.

[0014] 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

[0015] Figure 1 It is a cross-sectional view of the air spring solenoid valve of the utility model;

[0016] Figure 2It is a partial schematic diagram of the dynamic seal and the sealing main body structure in the first embodiment of the utility model;

[0017] Figure 3 It is a partial schematic diagram of the dynamic seal and the sealing main body structure in the second embodiment of the utility model;

[0018] Figure 4 It is a partial schematic diagram of the sealing assembly structure in the third embodiment of the present utility model;

[0019] Figure 5 It is a cross-sectional front view of the special-shaped sealing ring in the utility model.

[0020] Description of reference numerals:

[0021] 1. Shell; 2. Coil assembly; 3. Armature; 4. Connecting rod; 5. Piston body; 6. Sealing body; 7. Buffer; 8. Sealing ring; 9. Guide ring; 10. Auxiliary sealing ring; 11. Guide sleeve; 12. Magnetic tube; 13. Base; 14. Upper concave cavity; 15. Limiting protrusion; 16. Limiting step; 17. First lip edge; 18. Second lip edge. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0025] See also Figure 1-2 As shown, an embodiment of the present application discloses an air spring solenoid valve, comprising a housing 1, a coil assembly 2 and a valve seat, wherein the housing 1 is sleeved on the outside of the coil assembly 2, and the lower end thereof is connected to the valve seat by bending and fixing.

[0026] In addition, in this embodiment, see the attached Figure 2An armature 3 is axially slidably installed in the inner cavity of the coil assembly 2, the lower end of the armature 3 is connected to a connecting rod 4, the lower end of the connecting rod 4 is connected to a piston body 5, and a valve port is opened on the valve seat. When the coil assembly 2 is energized, it can generate an axial magnetic force, thereby driving the armature 3 to rise and fall in the coil assembly, driving the connecting rod 4 and the piston body 5 to rise and fall together, thereby realizing the opening and closing of the valve port.

[0027] In this embodiment, the piston body 5 is preferably made of plastic material, and the piston body 5 is integrally molded on the lower end of the connecting rod 4. The integral molding process is convenient to process and has high connection strength.

[0028] In some other embodiments, the piston body 5 may also be a metal part, and the metal piston body 5 needs to be connected to the lower end of the connecting rod 4 by means of interference fit. Compared with the one-piece overmolding process, this method has an additional press-fitting process, and the press-fitting process will also produce press-fitting debris, which will cause pollution.

[0029] More specifically, in the above structure, a sealing assembly for sealing the valve port and for buffering the impact force at the end of the return stroke of the piston body 5 is connected to the piston body 5. Preferably, the sealing assembly includes a sealing body 6 and a buffer 7, wherein the sealing body 6 is connected to the lower end of the piston body 5 by rubber coating through a vulcanization process, and the lower end of the sealing body 6 forms a sealing plane for sealing the valve port; the buffer 7 is connected to the top wall of the valve cavity and / or the upper end surface of the piston body 5.

[0030] In addition, in this embodiment, the dynamic seal includes a sealing ring 8 and a guide ring 9, and the sealing ring 8 and the guide ring 9 are spaced apart and slidably arranged between the radial outer wall of the piston body 5 and the radial inner wall of the valve cavity. Figure 2 Two axially spaced sealing grooves are provided on the outer peripheral wall of the piston body 5, and the sealing ring 8 and the guide ring 9 are respectively fitted in the upper and lower sealing grooves along the upper and lower positions, and the special-shaped sealing ring 10 here is preferably a specially designed special-shaped sealing ring, and can also be replaced by a star-shaped special-shaped sealing ring.

[0031] In this structure, the guide ring 9 is made of PTFE material, and in order to facilitate installation, an inclined opening is provided in the middle of the guide ring 9, and the opening penetrates the guide ring 9 axially. In this structure, the guide ring 9 mainly plays a guiding and supporting role.

[0032] In addition, the special-shaped sealing ring refers to the sealing ring 8 having a cross-section with an unconventional special-shaped structure, see the attached Figure 5, two first lips 17 are arranged on the radial inner side of the special-shaped sealing ring, and two second lips 18 are arranged on the radial outer side of the special-shaped sealing ring. The two first lips 17 and the adjacent first lips 17 and second lips 18 are transitioned by an inward concave arc surface, and the two second lips 18 are transitioned by a V-shaped groove, so that the outward protrusion length of the two second lips 18 is greater than the outward protrusion length of the two first lips 17. 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 cavity, and the longer sealing lip rubber has more wear margin than the conventional star-shaped sealing ring structure; 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.

[0033] On the other hand, participating in Figure 2 It can be seen that the inner hole of the coil assembly is equipped with a guide sleeve 11 with an opening facing downward, the armature 3 is slidably mounted in the guide sleeve 11, 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 air spring solenoid valve and improving 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.

[0034] 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 11. From another perspective, it can improve the response speed of the entire air spring solenoid valve.

[0035] In this structure, the special-shaped sealing ring 10 and the guide ring 9 are arranged in an axially spaced arrangement. Since two sealing grooves need to be opened on the outer wall of the piston body 5, the thickness of the buffer 7 installed on the top of the piston body 5 is insufficient. At this time, the buffer 7 is selected to be embedded in the top wall of the valve cavity; of course, if conditions permit, the buffer 7 can also be embedded in the upper end face of the piston body 5. Example

[0036] See attached Figure 3The 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 8 and an auxiliary sealing ring 10, and the sealing ring 8 and the auxiliary sealing ring 10 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 10 is located at the radial outer end of the sealing ring. In this structure, the auxiliary sealing ring 10 needs to play a sealing role, and also play a role in reducing friction resistance and improving response speed. The auxiliary sealing ring 10 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, and the main material is still rubber material, that is, the auxiliary sealing ring 10 has a certain elastic deformation performance, which is convenient for it to be installed in the sealing groove.

[0037] Specifically, a sealing groove is opened on the outer wall of the piston body 6, the sealing ring 8 is arranged on the radial inner side, the auxiliary sealing ring 10 is arranged on the radial outer side, and the inner wall of the sealing ring 8 is sealed with the radial inner wall of the sealing groove, the outer wall of the sealing ring 8 is sealed with the inner wall of the auxiliary sealing ring 10, and the outer wall of the auxiliary sealing ring 10 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 10 is in contact with the sealing ring 8, so as to better ensure that the sealing ring 8 is stabilized in the center position in the axial direction and ensure stable sealing performance.

[0038] In this structure, the seal 8 and the guide ring 9 are arranged radially, and the thickness of the buffer 7 mounted on the top of the piston body 5 is usually sufficient, so the buffer 7 is preferably embedded in the upper end surface of the piston body 5; of course, it can also be embedded in the top wall of the valve cavity. Example

[0039] This embodiment is improved on the basis of the first embodiment or the second embodiment, and the only difference is that the structure of the sealing component in this embodiment is changed.

[0040] See attached Figure 4 , which shows an improved structural diagram based on the second embodiment, specifically, the sealing assembly includes a sealing body 6 connected to the lower end of the piston body 5 by a vulcanization process, and the lower end of the sealing body 6 forms a sealing plane for sealing the valve port. The upper end face of the sealing cylinder 6 is convexly formed with a plurality of circumferentially distributed limiting protrusions 15, and a limiting step 16 is also provided on the valve seat. When the piston body 5 moves upward to the limit position, the upper end faces of the plurality of limiting protrusions 15 abut against the lower end faces of the limiting steps 16. 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 limiting protrusions 15, 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.

[0041] The valve seat includes an axially connected magnetic tube 12 and a base 13, and the lower end of the shell 1 is connected to the outer wall of the base 13; an annular buffer 7 is embedded on the top wall of the upper concave cavity 14 of the magnetic tube 12, and the lower end of the buffer 7 is convexly formed with multiple triangular buffer protrusions distributed along the circumferential direction.

[0042] In the above structure, before the top of the piston body 5 reaches the top of the valve chamber, multiple limit bumps 15 first abut against the limit steps 16, which not only plays a role in buffering the impact force at the end of the return stroke of the piston body 5, but also can stop the piston body 5 from resetting to the extreme position, thereby avoiding rigid contact between the top of the piston body 5 and the top wall of the valve chamber.

[0043] 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.

[0044] 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. An air spring solenoid valve, comprising a housing (1), a coil assembly (2) and a valve seat, wherein the housing (1) is sleeved on the outside of the coil assembly (2), and the lower end of the housing (1) is used for connecting and fixing the valve seat, an armature (3) is slidably mounted in the coil assembly (2), the lower end of the armature (3) is connected to a connecting rod (4), the valve seat is provided with a valve cavity and a valve port connected thereto, the lower end of the connecting rod (4) is connected to a piston body (5) for opening and closing the valve port, a dynamic seal is provided between the radial outer periphery of the piston body (5) and the inner wall of the valve cavity, and the invention is characterized in that: The piston body (5) is integrally overmolded at the lower end of the connecting rod (4), 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 (5) is connected to the piston body (5).

2. The air spring solenoid valve according to claim 1, characterized in that: The sealing assembly comprises a sealing body (6) and a buffer component (7); the sealing body (6) is connected to the lower end of the piston body (5) by rubber coating through a vulcanization process, and the lower end of the sealing body (6) forms a sealing plane for sealing the valve port; the buffer component (7) is connected to the top wall of the valve cavity and / or the upper end surface of the piston body (5).

3. The air spring solenoid valve according to claim 1 or 2, characterized in that: The dynamic seal comprises a sealing ring (8) and a guide ring (9), wherein the sealing ring (8) and the guide ring (9) are arranged in an axially spaced manner to seal between the radial outer wall of the piston body (5) and the radial inner wall of the valve cavity; the sealing ring (8) is a special-shaped sealing ring.

4. The air spring solenoid valve according to claim 3, characterized in that: Two first lip edges (17) are arranged on the radial inner side of the special-shaped sealing ring, and two second lip edges (18) are arranged on the radial outer side of the special-shaped sealing ring. The two first lip edges (17) and each adjacent first lip edge (17) and second lip edge (18) are transitioned through an inwardly concave arc surface, and the two second lip edges (18) are transitioned through a V-shaped groove, so that the outward protrusion length of the two second lip edges (18) is greater than the outward protrusion length of the two first lip edges (17).

5. The air spring solenoid valve according to claim 1 or 2, characterized in that: The dynamic seal comprises a sealing ring (8) and an auxiliary sealing ring (10), wherein the sealing ring (8) and the auxiliary sealing ring (10) are arranged closely in the radial direction and seal between the radial outer wall of the piston body (5) and the radial inner wall of the valve cavity, and the auxiliary sealing ring (10) is located at the radial outer end of the sealing ring.

6. The air spring solenoid valve according to claim 5, characterized in that: A guide sleeve (11) 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 (11), and a PTFE coating is provided on the radial outer peripheral wall of the armature (3).

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