Rigidity valve and fixed iron assembly thereof

Abstract

The utility model provides a stiffness valve and a fixed iron assembly thereof. The rigidity valve comprises a valve seat, a valve element and a fixed iron assembly. The valve element is sleeved with the fixed iron assembly and the valve seat. The valve element can move in the axial direction relative to the fixed iron assembly and the valve seat. The fixed iron assembly comprises fixed iron, the fixed iron is provided with an inner cavity used for containing a valve element, a circle of groove is formed in the cavity wall of the inner cavity, and a movable sealing rubber body is connected to the groove in a vulcanized mode. The dynamic sealing rubber body is located between the fixed iron and the valve element and matched with the peripheral wall of the valve element to form a dynamic sealing pair. By means of the configuration, the structure of the dynamic seal is simplified, the assembling difficulty and the machining cost of the dynamic seal are reduced, integrated dynamic seal is achieved, the sealing effect is better, and the sealing performance is more stable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air spring technical field, and particularly relates to a stiffness valve and its fixed iron subassembly. BACKGROUND

[0002] With the development of the automobile industry, the automobile positioning in the consumer market is changing. End consumers no longer regard the automobile as a transport tool, and the automobile has become a carrier and space for improving the quality of life. This consumption trend means that the industry is pursuing automobile intelligence while also needing to further improve the comfort and driving quality of the automobile. Vehicles with air springs have good ride smoothness and ride stability when driving on winding roads due to the use of air springs, can effectively ensure the excellent adhesion of the tire to the road, and can effectively reduce the road damage ability of the vehicle, thereby improving the steering stability and driving safety of the vehicle when driving at high speed. And the stiffness valve as an important part of the air spring system, its existence makes the air suspension system realize the variable volume additional air chamber, the switchable characteristic curve and the set motion or comfortable mode switching, therefore, the demand of stiffness valve is also more and more big. The stiffness valve commonly used in the current automobile industry belongs to a normally open electromagnetic valve; when the stiffness valve is not powered, the valve port is opened, and air flows between the two valve cavities through the radial channel on the valve seat; after the stiffness valve is powered, the valve core moves downward under the action of electromagnetic force and contacts the valve seat, closes the valve port, and the flow channel between the two valve cavities is cut off, and the valve port is in a sealed state, at this time, the dynamic sealing property of the circumferential gap between the valve core and the fixed iron needs to be ensured to further cut off the flow channel between the two valve cavities. The dynamic seal between the valve core and the fixed iron is usually composed of sealing rubber and a plastic skeleton, which is positioned and installed between the valve core and the fixed iron as an independent component, and needs to rely on the valve seat and the fixed iron to limit the position of the dynamic seal structure. Although this kind of dynamic seal structure can achieve sealing effect to some extent, it has complex structure, high positioning and installation difficulty and high processing cost.

[0003] It should be noted that the information disclosed in the background section of this application is only intended to deepen the understanding of the general background of the application, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a stiffness valve and its fixed iron subassembly to solve the problems of complex structure, high assembly difficulty and high cost of dynamic seal in the existing stiffness valve.

[0005] To achieve the above-mentioned purpose, the utility model provides a fixed iron subassembly of a stiffness valve, which comprises a fixed iron, the fixed iron has an inner cavity for accommodating a valve core, a groove is arranged on the cavity wall of the inner cavity, and a dynamic seal rubber body is vulcanized and connected on the groove.

[0006] Optionally, the dynamic sealing rubber body comprises a base and a sealing protrusion, at least part of the outer surface of the base is vulcanization connected on the groove, and the sealing protrusion is radially protruded from the groove.

[0007] Optionally, an adhesive is arranged between the groove and the base.

[0008] Optionally, the groove is provided with a receiving groove near the outer part of the central axis of the fixed iron, and the receiving groove accommodates the sealing protrusion.

[0009] Optionally, the entire outer surface of the base is vulcanization connected on the groove, so that the base and the valve seat of the stiffness valve are separated by the fixed iron.

[0010] Optionally, the sealing protrusion is inclined towards the central axis of the fixed iron, and the minimum distance between one end of the sealing protrusion and the central axis of the dynamic sealing rubber body and the maximum distance between the other end of the sealing protrusion and the central axis of the dynamic sealing rubber body are provided, the minimum distance can make the one end of the sealing protrusion interference fit with the valve core of the stiffness valve, and the maximum distance can make the other end of the sealing protrusion clearance fit with the valve core of the stiffness valve.

[0011] Optionally, the minimum distance is less than or equal to 7.3mm, and the maximum distance is 7.75mm-7.85mm.

[0012] Optionally, the cross section of the groove in the axial direction is an isometric rectangle.

[0013] To achieve the above-mentioned purpose, the utility model also provides a stiffness valve, it includes valve seat, valve core and the fixed iron assembly of any one described, the fixed iron assembly and the valve seat inner sleeve the valve core, the valve core can be relative to the fixed iron assembly and the valve seat moves in the axial direction, the dynamic sealing rubber body is located between the fixed iron and the valve core, and it is formed with the dynamic sealing pair with the outer wall of the valve core.

[0014] Optionally, the sealing protrusion is inclined towards the valve core, one end of the sealing protrusion interference fit with the valve core, and the other end of the sealing protrusion clearance fit with the valve core.

[0015] Compared with the prior art, the technical scheme of the utility model is that the dynamic sealing rubber body is vulcanization connected on the fixed iron, not only simplifies the structure of the dynamic sealing, reduces the assembly difficulty and processing cost of the dynamic sealing, but also realizes the integrated dynamic sealing, the sealing effect is better, and the sealing performance is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings are used to better understand the utility model, and do not constitute improper limitation on the utility model. Among them:

[0017] Figure 1 is a structure schematic view of the rigidity valve in the preferred embodiment of the utility model;

[0018] Figure 2 is Figure 1 is a partial enlarged view of the rigidity valve about detail A, the cross section of the groove shown in the axial direction is an equal-height rectangle;

[0019] Figure 3 is a size schematic view of the up and down sealing protrusion in the preferred embodiment of the utility model.

[0020] In the drawings:

[0021] 1-electromagnetic module, 2-sleeve, 3-armature, 4-connecting rod, 5-spring, 6-fixed iron, 60-groove, 61-receiving groove, 7-valve core, 8-valve seat, 80-valve port, 9-housing, 10-moving sealing rubber body, 101-base, 102-sealing protrusion, 110-central axis of the moving sealing rubber body, 11, 12, 13-sealing ring, 1A, 1B-valve cavity, 14-valve port sealing rubber, 15-limiting rubber, dmin-minimum distance, dmax-maximum distance. DETAILED DESCRIPTION

[0022] The embodiments of the utility model are described below through specific concrete examples, and other advantages and effects of the utility model can be easily understood by those skilled in the art from the disclosure of the specification. The utility model can also be implemented or applied through another different specific embodiment, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the drawings provided in the present embodiment only illustrate the basic concept of the utility model in a schematic manner, and the drawings only show the components related to the utility model without drawing the components number, shape and size when actually implemented, and the type, number and proportion of each component can be randomly changed when actually implemented, and the component layout type can also be more complex.

[0023] In addition, each embodiment of the following description has one or more technical features, but this does not mean that those who use the utility model must simultaneously implement all the technical features in any embodiment, or can only separately implement one or all technical features in different embodiments. In other words, under the premise of implementation, those skilled in the art can selectively implement part or all of the technical features in any embodiment or selectively implement a combination of part or all of the technical features in multiple embodiments according to the disclosure of the utility model, and according to the design specification or implementation requirements, thereby increasing the flexibility of the utility model implementation.

[0024] As used in this specification, the singular forms "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense of "and / or" unless the content clearly dictates otherwise, and the term "have" or "has" is generally employed in its sense of "have or has at least one" or "having or having at least one." The term "mounting," "connected," "connection" should be given the broadest possible interpretation including but not limited to fixedly connected, detachably connected, or integrally connected. It can be a mechanical connection, or an electrical connection. It can be a direct connection, or an indirect connection via an intermediate medium. It can be a communication within two elements, or an interaction between two elements. The relative terms "first", "second", and the like are used to distinguish one entity or operation from another, but do not necessarily require or imply any such actual relationship or order between or among such entities or operations, nor indicate or imply relative importance or number of the indicated technical features. It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the present application, "circumferential" refers to the direction around the center axis of the stiffness valve, "axial" refers to the direction parallel to the center axis of the stiffness valve, and "radial" refers to the direction perpendicular to the center axis of the stiffness valve. In addition, "height" refers to the size in the axial direction.

[0026] The present application aims to provide a stiffness valve and a fixed iron assembly thereof, to solve the problems of complex structure, difficult assembly, and high processing cost of dynamic sealing in existing stiffness valves. The following will be described in conjunction with the drawings.

[0027] Figure 1 A structural schematic diagram of a stiffness valve provided by an exemplary embodiment of the present application is shown, Figure 2 A structural schematic diagram of a stiffness valve provided by an exemplary embodiment of the present application is shown, Figure 1 A partial enlarged view of the stiffness valve about detail A is shown.

[0028] As Figure 1 and Figure 2As shown, in some embodiments, the stiffness valve comprises components such as electromagnetic module 1, sleeve 2, armature 3, connecting rod 4, spring 5, fixed iron 6, valve core 7, valve seat 8, and housing 9. The stiffness valve also generally comprises sealing rings 11, 12, and 13, for example, respectively arranged outside the top end of housing 9, outside the bottom end of valve seat 8, and between fixed iron 6 and housing 9. Of course, the number and position of the sealing rings 11, 12, and 13 can be reasonably adjusted according to actual conditions, and the present application is not limited thereto.

[0029] In more detail, electromagnetic module 1 is partially arranged in housing 9 and fixedly connected with housing 9; sleeve 2 is located between electromagnetic module 1 and armature 3, and also between electromagnetic module 1 and fixed iron 6; armature 3 and fixed iron 6 are arranged in the axial direction of the stiffness valve, with fixed iron 6 arranged below armature 3 and fixed iron 6 required to remain stationary; in addition, the upper end of fixed iron 6 is connected with sleeve 2, and the lower end of fixed iron 6 is fixedly sleeved with housing 9; further, fixed iron 6 and valve seat 8 are sleeved with valve core 7, and valve core 7 can move in the axial direction relative to fixed iron 6 and valve seat 8 to selectively open or close valve port 80 on valve seat 8; valve seat 8 is fixedly connected with fixed iron 6 and housing 9, respectively; fixed iron 6, valve core 7, spring 5, and armature 3 are all sleeved on connecting rod 4; the upper end of connecting rod 4 is fixedly connected with armature 3, and the lower end of connecting rod 4 is fixedly connected with valve core 7; in addition, the lower end of spring 5 is limited on fixed iron 6, and the upper end of spring 5 is limited on armature 3; when electromagnetic module 1 is de-energized, spring 5 releases elastic potential energy, pushes armature 3, and drives valve core 7 to move upward to reset; the inner hole of valve core 7 is often provided with two through holes at the connection with connecting rod 4, for connecting the cavities on the upper and lower sides of valve core 7.

[0030] The working mode of the above stiffness valve is as follows: when electromagnetic module 1 is energized, armature 3 moves downward under the action of electromagnetic force, and drives connecting rod 4 and valve core 7 to move downward until valve core 7 contacts valve seat 8, closes valve port 80, and cuts off two valve cavities 1A and 1B; at this time, valve core 7 is provided with valve port sealing rubber 14 at the bottom of the contact with valve port 80 to seal valve port 80, and fixed iron 6 and valve core 7 need to maintain a sealed state; conversely, when electromagnetic module 1 is de-energized, armature 3 moves upward under the action of spring 5, synchronously drives connecting rod 4 and valve core 7 to move upward, opens valve port 80, connects two valve cavities 1A and 1B, and enables air to flow between the two valves 1A and 1B.

[0031] Further, for dynamic sealing of the circumferential gap between fixed iron 6 and valve core 7, the present embodiment provides a dynamic sealing rubber body 10 which is directly vulcanized and connected on fixed iron 6. Understandably, the dynamic sealing rubber body 10 is located between fixed iron 6 and valve core 7, and cooperates with the outer peripheral wall of valve core 7 to form a dynamic sealing pair.

[0032] Based on this, the embodiment also provides a fixed iron assembly, which comprises the fixed iron 6, and the fixed iron 6 itself has an inner cavity (not labeled) for accommodating the valve core 7, and a groove 60 is arranged on the inner cavity wall of the fixed iron 6, and the dynamic sealing rubber body 10 is vulcanizedly connected on the groove 60.

[0033] Further, the dynamic sealing rubber body 10 comprises a base 101 and a sealing protrusion 102, and the sealing protrusion 102 is arranged on the outer part of the base 101 close to the central axis of the fixed iron 6. Wherein: at least part of the outer surface of the base 101 is vulcanizedly connected on the groove 60, and the sealing protrusion 102 is radially protruded from the groove 60 and abuts against the outer peripheral wall of the valve core 7; and there is a certain interference between the sealing protrusion 102 and the outer peripheral wall of the valve core 7, so as to achieve good sealing.

[0034] It should be noted that the number of the sealing protrusions 102 can be adjusted and changed according to different models and sizes of the air spring stiffness valve, and two sealing protrusions 102 can be arranged generally. In the embodiment, one sealing protrusion 102 is arranged on each of the upper and lower sides of the outer part of the base 101, and the two sealing protrusions 102 are bent away from each other, so as to bear the force from different directions and ensure that the sealing protrusions 102 can reliably seal when bearing the force, thereby avoiding air leakage.

[0035] In this way, since the dynamic sealing rubber body 10 is vulcanizedly connected on the fixed iron 6, the integrated dynamic sealing is achieved, the sealing effect is better, the sealing performance is more stable, and the position of the dynamic sealing no longer needs to be limited by the valve seat 8 and the fixed iron 6, thereby simplifying the structure of the dynamic sealing, reducing the assembly difficulty and processing cost of the dynamic sealing.

[0036] Further, during the vulcanization process, the preformed fixed iron 6 can be placed in a mold cavity, then the rubber material is filled in the inner cavity of the fixed iron 6, and the dynamic sealing rubber body 10 is formed in the inner part of the fixed iron 6 through hot vulcanization molding. Preferably, the fixed iron 6 is subjected to degreasing treatment before being placed in the mold cavity, so as to avoid that the dirt, grease and other substances on the surface of the fixed iron 6 have negative effects on the adhesion between the dynamic sealing rubber body 10 and the fixed iron 6. Preferably, the injection area of the fixed iron 6 is smeared with an adhesive after being cleaned, that is, the adhesive is smeared in the groove 60 before the rubber is injected and vulcanized, and therefore, the adhesive is arranged between the groove 60 and the base 101. The use of the adhesive increases the adhesion between the dynamic sealing rubber body 10 and the groove wall, and reduces the risk of falling off of the dynamic sealing rubber body 10 during the working process.

[0037] The groove 60 can be made into any suitable shape. Optionally, the cross section of the groove 60 in the axial direction is an isometric rectangle, that is, the height of the groove 60 is constant in the axial direction, and the specific structure can be seen from Figure 2As shown. Preferably, the entire outer surface of the base 101 is vulcanized and connected to the groove 60, thereby separating the base 101 and the valve seat 8 by the fixed iron 6, preventing the dynamic sealing rubber body 10 from contacting the valve seat 8. It should also be noted that the outer surface of the base 101 includes an upper surface, a lower surface, and an outer peripheral surface, with the outer peripheral surface of the base 101 being away from the central axis of the fixed iron 6.

[0038] In other configurations, the groove 60 has a rectangular cross-section with unequal heights along its axial direction. Specifically, the groove 60 increases in height radially toward the central axis of the stationary iron 6, forming a stepped structure. Preferably, a portion of the outer surface of the base 101 is vulcanized and connected to the groove 60, creating a gap between the unvulcanized outer surface (mainly the lower surface) of the base 101 and the valve seat 8 to prevent contact between the dynamic sealing rubber body 10 and the valve seat 8, thus preventing deformation of the dynamic sealing rubber body 10.

[0039] like Figure 2 As shown, optionally, the groove 60 is provided with a receiving groove 61 on the outer side (i.e., the inner circumferential surface) near the central axis of the fixed iron 6. The sealing protrusion 102 protrudes radially from the receiving groove 61 to fit against the outer circumferential wall of the valve core 7. Furthermore, the receiving groove 61 can accommodate the sealing protrusion 102 when it deforms under stress. It should also be understood that in other cases, the receiving groove 61 may not be provided.

[0040] Furthermore, the valve core 7 generally includes an end face mounting portion and a main body portion. The main body portion is used to mate with the dynamic sealing rubber body 10 to form a dynamic sealing pair, while the end face mounting portion is used to mount the valve port sealing rubber 14. The main body portion of the valve core 7 can be of constant or variable diameter. When the main body portion of the valve core 7 is of constant diameter, the assembly requirements of the dynamic sealing pair between the dynamic sealing rubber body 10 and the valve core 7 can be reduced, thereby reducing the processing difficulty and cost of the valve core 7. When the main body portion of the valve core 7 is of variable diameter, the risk of deformation and damage to the dynamic sealing rubber body 10 during use can be reduced, extending the service life of the dynamic sealing rubber body 10 while ensuring sealing performance.

[0041] When the main body of the valve core 7 has a variable diameter, if the valve port 80 is open, the upper and lower sealing protrusions 102 of the dynamic sealing rubber body 10 will cooperate with the two small diameter sections on the valve core 7. At this time, the deformation of the sealing protrusions 102 is small. Conversely, when the valve port 80 is closed, the upper and lower sealing protrusions 102 of the dynamic sealing rubber body 10 will cooperate with the two large diameter sections on the valve core 7. The deformation of the sealing protrusions 102 is large, which ensures both sealing performance and effective sealing time.

[0042] like Figure 1 and Figure 2As shown, the sealing protrusion 102 is arranged to be inclined towards the center axis of the fixed iron 6, i.e. towards the valve core 7. Preferably, one end of the sealing protrusion 102 is in interference fit with the valve core 7, and the other end of the sealing protrusion 102 is in clearance fit with the valve core 7, so as to avoid excessive contact area of the sealing protrusion 102 and increase the wear amount.

[0043] Here, the upper sealing protrusion 102 is exemplarily described. As shown in the figure, Figure 3 As shown, in the working process, the upper end of the sealing protrusion 102 is in interference fit with the valve core 7 to realize dynamic sealing, and the lower end of the sealing protrusion 102 is in clearance fit with the valve core 7. In the initial state, i.e. in the non-use state, the upper end of the sealing protrusion 102 has a minimum distance dmin from the center axis 110 of the dynamic sealing rubber body 10, and the lower end of the sealing protrusion 102 has a maximum distance dmax from the center axis 110 of the dynamic sealing rubber body 10. The minimum distance can enable the upper end of the sealing protrusion 102 to be in interference fit with the valve core 7, and the maximum distance can enable the lower end of the sealing protrusion 102 to be in clearance fit with the valve core 7. The lower sealing protrusion 102 is also arranged in the same way.

[0044] Preferably, the minimum distance is ≤7.3 mm. Under this distance, in the low-temperature working condition, the sealing protrusion 102 and the valve core 7 can still be in stable contact with each other, and the reliability of the sealing can be ensured.

[0045] Preferably, the maximum distance is 7.75 mm-7.85 mm. This distance can ensure that the contact force of the dynamic sealing rubber body 10 is small, and at the same time, the maximum strain of the dynamic sealing rubber body 10 is less than 30%, so as to prolong the service life of the dynamic sealing rubber body 10. Best, the maximum distance is 7.8 mm.

[0046] It should be noted that the maximum distance is negatively correlated with the contact force of the dynamic sealing rubber body 10 and positively correlated with the strain. Therefore, when the maximum distance is greater, the contact force is smaller, and the normal strain is greater. Therefore, the maximum distance should be reasonably set to be in the optimal state.

[0047] It should also be understood that the dynamic sealing rubber body 10 is actually in a ring structure and is arranged around the fixed iron 6 and the valve core 7. In addition, as can be seen from the figure, the upper and lower sealing protrusions 102 of the dynamic sealing rubber body 10 are not embedded in the fixed iron metal base, so that the upper and lower sealing protrusions 102 are not separated by the fixed iron metal base. The thickness of the entire dynamic sealing rubber body 10 in the radial direction is not consumed by the fixed iron 6, so that the dynamic sealing rubber body 10 has sufficient thickness in the radial direction, and the strength thereof is ensured.

[0048] Referring back to Figure 1The rigidity valve further comprises a limiting rubber 15 arranged on the top of the valve core 7, which can prevent collision.

[0049] As can be seen from the above, according to the technical scheme provided by the embodiment of the utility model, the dynamic sealing rubber body 10 is vulcanized and connected on the fixed iron 6, which not only simplifies the structure of the dynamic sealing, reduces the assembly difficulty and processing cost of the dynamic sealing, but also realizes the integrated dynamic sealing, has better sealing effect and more stable sealing performance.

[0050] Although the utility model discloses as above, but is not limited to this. The person skilled in the art can make various changes and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model belong to the scope of the utility model and its equivalent technology, then the utility model also intends to include these changes and variations.

Claims

1. A fixed iron assembly of a rigidity valve, characterized by, The fixed iron has an inner cavity for accommodating a valve core, and a groove is arranged on the cavity wall of the inner cavity, and a dynamic sealing rubber body is vulcanized and connected to the groove.

2. The fixed iron assembly of a stiffness valve according to claim 1, characterized in that, An adhesive is arranged between the groove and the base.

3. The fixed iron assembly of a stiffness valve according to claim 1, wherein The groove is provided with an accommodating groove near the outer part of the central axis of the fixed iron, and the accommodating groove accommodates the sealing protrusion.

4. The fixed iron assembly of a stiffness valve according to claim 1, wherein The entire outer surface of the base is vulcanized and connected to the groove, so that the base and the valve seat of the stiffness valve are separated by the fixed iron.

5. The fixed iron assembly of a stiffness valve according to claim 1, wherein The sealing protrusion is inclined towards the central axis of the fixed iron, and the minimum distance between one end of the sealing protrusion and the central axis of the dynamic sealing rubber body and the maximum distance between the other end of the sealing protrusion and the central axis of the dynamic sealing rubber body are provided, the minimum distance can make one end of the sealing protrusion interference fit with the valve core of the stiffness valve, and the maximum distance can make the other end of the sealing protrusion clearance fit with the valve core of the stiffness valve.

6. The rigidity valve setting iron assembly of claim 5, wherein, The minimum distance is less than or equal to 7.3 mm, and the maximum distance is 7.75 mm to 7.85 mm.

7. The fixed iron assembly of a stiffness valve according to claim 1, wherein The cross section of the groove in the axial direction is an isometric rectangle.

8. A stiffness valve characterized by, The fixed iron assembly and the valve seat accommodate the valve core, the valve core can move axially relative to the fixed iron assembly and the valve seat, and the dynamic sealing rubber body is located between the fixed iron and the valve core and cooperates with the outer peripheral wall of the valve core to form a dynamic sealing pair.

9. The stiffness valve of claim 8, wherein, The sealing protrusion is inclined towards the valve core, one end of the sealing protrusion interference fits with the valve core, and the other end of the sealing protrusion clearance fits with the valve core.

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