Rigidity valve

Abstract

The invention provides a rigidity valve which comprises fixed iron, a valve element and a valve seat. The valve core is sleeved in the fixed iron and the valve seat; the valve element can move in the axial direction relative to the fixed iron and the valve seat so as to selectively open or close a valve port in the valve seat. The stress areas of the upper surface and the lower surface of the valve element are equal, so that the upward gas pressure and the downward gas pressure borne by the valve element are equal. Through the configuration, the operation comfort and the response speed of the rigidity valve are improved, meanwhile, the sealing performance is improved, and the sealing stability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of air springs, and in particular relates to a stiffness valve. Background Art

[0002] With the development of the automobile industry, the consumer market's positioning of automobiles is changing. End consumers no longer only regard automobiles as means of transportation, but have become carriers and spaces for improving the quality of life. This consumption trend means that while the industry is pursuing automobile intelligence, it also needs to further improve the comfort and driving quality of automobiles. When vehicles with air springs are driving on tortuous roads, due to the stiffness characteristics and vibration frequency of air springs, they have better driving smoothness and driving stability, and can effectively ensure the excellent adhesion between tires and roads. It can also effectively reduce the vehicle's ability to damage the road surface, thereby improving the vehicle's handling stability and driving safety when driving at high speeds. Among them, the stiffness valve is an important component of the air spring system. Its existence enables the air suspension system to also realize variable volume additional air chambers, switchable characteristic curves, and settable sports or comfort mode switching. For this reason, the demand for stiffness valves is also increasing.

[0003] The rigidity valve currently used in the automotive industry usually includes valve body, fixed iron, dynamic seal, valve core and valve seat and other parts, which are normally open solenoid valves; when the rigidity valve is not powered, the valve port on the valve seat is in an open state, and air flows between the two valve chambers through the radial channel on the valve seat; after the rigidity valve is powered, the valve core moves downward under the action of electromagnetic force and contacts the valve seat, closing the valve port, cutting off the flow channel between the two valve chambers, and sealing the circumferential gap between the valve core and the fixed iron through dynamic seal. However, the existing rigidity valves need to be improved in terms of response speed, sealing effect and sealing stability.

[0004] It should be noted that the information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a stiffness valve which can effectively improve the response speed while increasing the sealing performance and sealing stability.

[0006] To achieve the above-mentioned purpose, the present invention provides a rigidity valve, which includes a fixed iron, a valve core and a valve seat; the valve core is sleeved inside the fixed iron and the valve seat; the valve core can move axially relative to the fixed iron and the valve seat to selectively open or close the valve port on the valve seat; and the valve core is arranged so that the force-bearing areas of the upper and lower surfaces are equal, so that the upward and downward gas pressures on the valve core are equal.

[0007] Optionally, the diameter of the sealing contact surface between the valve core and the valve port is equal to the maximum outer diameter of the valve core.

[0008] Optionally, the valve core has a first diameter section and a second diameter section, the outer diameter of the second diameter section is larger than the outer diameter of the first diameter section, the first diameter section and the second diameter section are alternately arranged, and the diameter of the sealing contact surface is equal to the outer diameter of the second diameter section; or, the valve core is an equal diameter structure.

[0009] Optionally, the stiffness valve also includes a dynamic sealing assembly, which is located between the valve core and the fixed iron; the dynamic sealing assembly includes a metal frame and a lateral sealing rubber part; the lateral sealing rubber part is installed on the metal frame; and the metal frame is connected to the mounting groove on the fixed iron by an interference fit, and the valve seat and the lateral sealing rubber part are clearance-fitted.

[0010] Optionally, the lateral sealing rubber component and the metal frame are integrally formed by rubber vulcanization.

[0011] Optionally, the lateral sealing rubber component includes a base and a sealing lip; a sealing lip is provided on the upper and lower sides of the outside of the base; the two sealing lips are bent away from each other; an annular protrusion is provided on the outer surface of the base; the annular protrusion and the fixed iron are interference fit to form a static sealing pair, and the base and the fixed iron are gap fit.

[0012] Optionally, both the upper surface and the lower surface of the base are provided with the annular protrusion, and the annular protrusion is arranged away from the sealing lip.

[0013] Optionally, the annular protrusion is a single-convex structure or a multi-convex structure.

[0014] Optionally, the installation slot includes an interference fit groove, a rubber receiving groove and a sealing lip receiving groove which are arranged in sequence from the inside to the outside in the radial direction and distributed in a step-like manner; the metal skeleton is connected to the interference fit groove by interference fit; the base is located in the rubber receiving groove, and the sealing lip is located in the sealing lip receiving groove; the sealing lip protrudes from the sealing lip receiving groove in the radial direction of the fixed iron; the installation slot axially penetrates the bottom of the fixed iron, so that the bottom of the installation slot is open.

[0015] Optionally, the metal skeleton includes a central column, an annular flange is arranged on the outer peripheral surface of the central column, the two ends of the annular flange along the axial direction are shorter than the central column, the annular flange is connected to the mounting slot by interference fit, and / or, a plurality of through holes are arranged radially on the central column of the metal skeleton, and the plurality of through holes are evenly distributed.

[0016] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0017] The aforementioned stiffness valve can make the upward and downward gas pressures to which the valve core is subjected equal during operation by making the force-bearing areas of the upper and lower surfaces of the valve core equal. On the one hand, only a smaller spring force is required to open the valve port, making the opening operation more comfortable and controllable, and the response speed faster. On the other hand, the valve core only bears the electromagnetic force in the direction of pressing the valve seat, and will not bear additional upward or downward gas pressure. The pressing force between the valve core and the valve seat, that is, the sealing of the valve port, is only guaranteed by the electromagnetic force, so the sealing effect is good and the sealing performance is more stable.

[0018] The aforementioned stiffness valve is connected with the fixed iron through interference fit of the metal frame in the dynamic seal assembly, so that the dynamic seal assembly and the fixed iron are assembled and connected as one, and there is no need to use the valve seat and the fixed iron to limit the installation of the dynamic seal assembly, thereby simplifying the structure of the dynamic seal and reducing the assembly difficulty and processing cost of the dynamic seal.

[0019] The aforementioned stiffness valve forms an interference fit with the fixed iron by setting an annular protrusion on the lateral sealing rubber part, thereby further sealing the leakage channel between the fixed iron and the dynamic sealing assembly, improving the sealing performance, while not affecting the sealing effect of the sealing lip, thereby ensuring the dynamic sealing performance.

[0020] The aforementioned stiffness valve increases the reliability of sealing by setting the annular protrusion as a multi-protrusion structure, and also avoids the contact between the lateral sealing rubber part and the valve seat and deformation of the lateral sealing rubber part by matching the clearance between the valve seat and the lateral sealing part, thereby ensuring dynamic sealing performance and extending the service life of the lateral sealing rubber part.

[0021] The aforementioned stiffness valve adopts a variable diameter structure through the valve core, which greatly reduces the risk of deformation and damage of the lateral sealing rubber parts during use, thereby ensuring the dynamic sealing performance and greatly extending the service life of the lateral sealing rubber parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0023] Figure 1 is a structural schematic diagram of a stiffness valve in a preferred embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A partial enlarged view of detail B of the medium stiffness valve;

[0025] Figure 3 is an axial cross-sectional view of a metal skeleton in a preferred embodiment of the present invention;

[0026] Figure 4In another preferred embodiment of the present invention, Figure 1 A partial enlarged view of detail B of the medium stiffness valve;

[0027] Figure 5 In another preferred embodiment of the present invention, Figure 1 Enlarged view of detail B of the medium stiffness valve;

[0028] Figure 6 It is a structural schematic diagram of the valve core in a preferred embodiment of the present invention, when the valve core adopts a variable diameter and contacts with the valve seat to close the valve port;

[0029] Figure 7 It is a structural schematic diagram of a preferred embodiment of the present invention in which a valve core with equal diameter contacts with a valve seat and closes the valve port.

[0030] [Description of reference numerals is as follows]:

[0031] 11-electromagnetic module, 12-sleeve, 13-armature, 14-connecting rod, 15-spring, 16-fixed iron, 160-installation notch, 161-interference fit groove, 162-rubber receiving groove, 163-sealing lip receiving groove, 17-valve core, 171-first diameter section, 172-second diameter section, 18-valve seat, 181-valve port, 19-housing, 20-dynamic seal assembly, 21, 22, 23-sealing ring, 2 4-valve port sealing rubber, 101, 102-two valve chambers; 31-metal frame, 311-center cylinder, 312-annular flange, 3101-outer ring surface of metal frame, 3102-lower surface of metal frame, 32-lateral sealing rubber part, 321-base, 322-sealing lip, 323-annular protrusion, D1-outer diameter of the first diameter section, D2-outer diameter of the second diameter section, D3-diameter of the sealing contact surface. DETAILED DESCRIPTION

[0032] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0033] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise that implementation is possible, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0034] As used in this specification, the singular forms "one", "an", and "the" include plural objects, and the plural form "a plurality" includes two or more objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise, and the terms "installed", "connected", 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. Relational terms such as the terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly indicate the number of technical features indicated. It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] As described in this application document, "upper surface" refers to the side away from the valve seat, "lower surface" refers to the side facing the valve seat, "outer peripheral surface" and "outer annular surface" are both the side away from the central axis of the rigidity valve, "inner annular surface" and "inner side surface" are the side close to the central axis of the rigidity valve, "axial" refers to the direction along the central axis of the rigidity valve, "circumferential" refers to the direction around the central axis of the rigidity valve, and "radial" is the direction perpendicular to the central axis of the rigidity valve, and the radial direction is the horizontal direction.

[0036] The object of the present invention is to provide a stiffness valve, aiming to effectively improve the response speed of the stiffness valve, increase the sealing effect, and enhance the sealing stability.

[0037] The rigidity valve provided by the present invention comprises a valve core, a valve seat and a fixed iron; the fixed iron and the valve seat are provided with a valve core; the valve core can move axially relative to the fixed iron and the valve seat to selectively open or close the valve port on the valve seat. It should be noted that for other structures in the rigidity valve, those skilled in the art can refer to the prior art for understanding, and this application will not elaborate on this. The following is a description in conjunction with the accompanying drawings.

[0038] Figure 1 FIG. 1 is a schematic diagram of the structure of a rigidity valve in an exemplary embodiment of the present invention. Figure 1 As shown, the stiffness valve includes components such as an electromagnetic module 11, a sleeve 12, an armature 13, a connecting rod 14, a spring 15, a fixed iron 16, a valve core 17, a valve seat 18 and a housing 19. The stiffness valve generally also includes sealing rings 21, 22 and 23. As shown in the figure, a sealing ring 21 is arranged on the outer side of the top end of the housing 19, a sealing ring 22 is arranged on the outer side of the bottom end of the valve seat 18, and a sealing ring 23 is arranged between the fixed iron 16 and the housing 19. Of course, the number and position of the sealing rings 21, 22 and 23 can be reasonably adjusted according to actual conditions. Specifically, the electromagnetic module 11 is partially arranged in the shell 19 and fixedly connected to the shell 19; the sleeve 12 is located between the electromagnetic module 11 and the armature 13 and the fixed iron 16; and the armature 13 and the fixed iron 16 are arranged along the axial direction of the stiffness valve, and the fixed iron 16 needs to be located below the armature 13; and the upper end of the fixed iron 16 is connected to the sleeve 12, and the lower end of the fixed iron 16 is fixedly fitted with the shell 19, for example, the fixed iron 16 and the sleeve 12 are first interference-connected and then welded. In addition, the valve core 17 is fitted in the fixed iron 16 and the valve seat 18, and the valve core 17 can move axially relative to the fixed iron 16 and the valve seat 18, so as to selectively open or close the valve port 181 on the valve seat 18. And the valve seat 18 is fixedly connected to the fixed iron 16 and the shell 19 respectively. At the same time, the fixed iron 16, the valve core 17, the spring 15 and the armature 13 are all sleeved on the connecting rod 14; the upper end of the connecting rod 14 is fixedly connected to the armature 13, and the lower end of the connecting rod 14 is fixedly connected to the valve core 17, for example, the connecting rod 14 is interference-connected with the armature 13 and the valve core 17; and the lower end of the spring 15 is limited to the fixed iron 16, and the upper end of the spring 15 is limited to the armature 13; thus, when the electromagnetic module 11 is powered off, the spring 15 releases elastic potential energy, pushes the armature 13 to drive the valve core 17 to move upward and reset. Two through holes are often set at the connection between the inner hole of the valve core 17 and the connecting rod 14, which are used to connect the cavities on the upper and lower sides of the valve core 17.

[0039] It can be understood that the working principle of the aforementioned stiffness valve is as follows: when the electromagnetic module 11 is energized, the armature 13 moves downward under the action of the electromagnetic force, and drives the connecting rod 14 and the valve core 17 to move downward until the valve core 17 contacts the valve seat 18, thereby closing the valve port 181, and a valve port sealing rubber 24 is provided at the bottom end where the valve core 17 contacts the valve seat 18, and the valve port sealing rubber 24 forms a sealing pair with the valve seat 18, and at the same time, the outer periphery of the valve core 17 and the inner periphery of the fixed iron 16 are sealed by the dynamic sealing assembly 20, thereby cutting off the flow channel between the two valve chambers 101 and 102; conversely, when the electromagnetic module 11 is de-energized, the armature 13 moves upward under the action of the spring 15, synchronously driving the connecting rod 14 and the valve core 17 to move upward, opening the valve port 181, and reconnecting the flow channel between the two valve chambers 101 and 102.

[0040] In the above-mentioned rigidity valve, the valve core 17 can be set to a constant diameter structure or a variable diameter structure. Figure 6 As shown, in one embodiment, the valve core 17 adopts a variable diameter structure. Specifically, the valve core 17 has a first diameter section 171 and a second diameter section 172, and the first diameter section 171 and the second diameter section 172 are axially staggered. Wherein: the outer diameter D2 of the second diameter section 172 is greater than the outer diameter D1 of the first diameter section 171, and optionally, D2 is 0.15 mm larger than D1. The second diameter section 172 is at least two sections, and correspondingly, the first diameter section 171 is also at least two sections; when the valve port 181 is opened, there are two corresponding first diameter sections 171 respectively cooperating with the upper and lower sealing lips 322 in the dynamic seal assembly 20, and at this time, the deformation of the sealing lips 322 is small; conversely, when the valve port 181 is closed, there are two corresponding second diameter sections 172 respectively cooperating with the upper and lower sealing lips 322 to ensure sealing performance and effective sealing time, and at this time, the deformation of the sealing lips 322 is large. As shown Figure 7 As shown, in another embodiment, the valve core 17 adopts a constant diameter structure and has a fixed outer diameter D2. It should be understood that the outer diameters D1 and D2 of the valve core 17 are actually the outer diameters of the main body of the valve core 17 used to cooperate with the dynamic seal assembly 20, and basically do not include the outer diameter of the structure where the valve port sealing rubber 24 is installed at the bottom end of the valve core 17.

[0041] The valve core 17, whether of variable diameter or equal diameter, is configured so that the force-bearing areas of the upper and lower surfaces are equal, thereby keeping the upward and downward gas pressures P1 and P2 to which the valve core 17 is subjected during operation equal. In this way, the valve core 17 will not bear additional upper and lower pressure differences, that is, the upper and lower pressure differences are zero. With such configuration, the valve core 17 only bears the electromagnetic force in the direction of pressing the valve seat 18 when the valve port 181 is closed, and will not bear additional upward or downward gas pressure. The pressing force between the valve core 17 and the valve seat 18, that is, the sealing of the valve port 181, is only ensured by the electromagnetic force, with good sealing effect and more stable sealing performance. On the other hand, the valve core 17 only bears the upward spring force when opening the valve port 181, and only a small spring force is required to open the valve port 181, making the opening operation more comfortable and controllable, and greatly improving the response speed.

[0042] In order to make the force-bearing areas of the upper and lower surfaces of the valve core 17 equal, in one embodiment, Figure 6 and Figure 7 As shown, the diameter D3 of the sealing contact surface between the valve core 17 and the valve seat 18 remains equal to the maximum outer diameter D2 of the valve core 17. At this time, regardless of axial air intake (corresponding to P2) or radial air intake (corresponding to P1), the upper and lower action areas of the gas pressure borne by the valve core 17 are equal. Here, it can be understood that when the valve core 17 is a variable diameter structure, the diameter D3 of the sealing contact surface remains equal to the outer diameter D2 of the second diameter section 172. It should also be noted that the valve port 181 is usually in the shape of a crater, and the sealing contact surface is the contact surface formed by the bottom end of the valve core 17 and the crater.

[0043] Specifically, in this embodiment, when the electromagnetic module 11 is powered on, the valve core 17 contacts the valve seat 18 to close the valve port 181, and the upper and lower sealing lips 322 in the dynamic sealing assembly 20 cooperate with the two second diameter sections 172 of the valve core 17 to form a dynamic sealing pair, so that the channels of the two valve chambers 101 and 102 of the stiffness valve are cut off, thereby achieving good sealing performance; when the electromagnetic module 11 is powered off, the armature 13, the connecting rod 14, and the valve core 17 move upward under the action of the spring 15. At this time, since the pressure and force area at the upper and lower parts of the valve core 17 are equal, the valve core 17 will not be subjected to additional upward or downward gas pressure. The spring 15 only needs to overcome the weight of the moving part itself to open the valve port 181 and realize the air flow of the two valve chambers 101 and 102. At this time, the upper and lower sealing lips 322 in the dynamic sealing assembly 20 cooperate with the two first diameter sections 1711 of the valve core 17, and the deformation of the sealing lips 322 is reduced.

[0044] Return to reference Figures 1 to 5Preferably, the dynamic seal assembly 20 includes a metal skeleton 31 and a lateral sealing rubber member 32; the lateral sealing rubber member 32 is installed on the metal skeleton 31. Correspondingly, an installation slot 160 is provided on the inner side of the fixed iron 16. The dynamic seal assembly 20 is installed in the installation slot 160, and the metal skeleton 31 is connected to the installation slot 160 by interference fit, so that the entire dynamic seal assembly 20 is positioned and installed between the valve core 17 and the fixed iron 16. In this way, there is no need to limit the dynamic seal assembly 20 with the help of the valve seat 18 and the fixed iron 16, thereby simplifying the structure of the dynamic seal and reducing the assembly difficulty and processing cost of the dynamic seal. In this way, the dynamic seal assembly 20 is assembled and connected to the fixed iron 16 as a whole, and is used as an independent fixed iron assembly, which is very convenient to install and use.

[0045] Specifically, the lateral sealing rubber part 32 cooperates with the valve core 17 to form a dynamic sealing pair, and the metal frame 31 cooperates with the valve core 17 with clearance, and does not contact the valve core 17. Preferably, the valve seat 18 cooperates with the lateral sealing rubber part 32 with clearance, so as to avoid contact between the lateral sealing rubber part 32 and the valve seat 18, and prevent the lateral sealing rubber part 32 from being deformed by force, thereby ensuring dynamic sealing performance and extending the service life of the lateral sealing rubber part 32.

[0046] It should also be known that the metal frame 31 and the lateral sealing rubber member 32 are both annular structures. Figure 2 , Figure 4 and Figure 5 As shown, the lateral sealing rubber part 32 is mainly installed on the metal frame 31 in a set manner, that is, the lateral sealing rubber part 32 is sleeved on the outside of the metal frame 31, so that the metal frame 31 is embedded in the inside of the lateral sealing rubber part 32, but the lateral sealing rubber part 32 also exposes part of the metal frame 31, so that the metal frame 31 can be connected with the fixed iron 16 by interference fit. Preferably, the lateral sealing rubber part 32 and the metal frame 31 are integrally formed by rubber vulcanization, that is, the lateral sealing rubber part 32 is integrally vulcanized and formed on the metal frame 31; this structure is simple, easy to process, and has good joint firmness and overall sealing performance.

[0047] During the vulcanization molding process, preferably, a plurality of through holes are radially arranged on the central column 311 of the metal skeleton 31 to increase the fluidity of the rubber. The through holes also increase the contact area between the rubber and the metal skeleton 31 to ensure the adhesion between the two. More preferably, the plurality of through holes on the inner annular surface of the metal skeleton 31 are evenly distributed. It should also be understood that after the rubber is vulcanized, rubber exists in these through holes on the metal skeleton 31 as part of the lateral sealing rubber part 32.

[0048] In addition, the metal skeleton 31 can have any suitable shape. Figure 3As shown, the metal skeleton 31 includes a central column 311, and an annular flange 312 is arranged on the outer peripheral surface of the central column 311, and the two ends of the annular flange 312 along the axial direction are shorter than the central column 311. In this way, the metal skeleton 31 can be connected with the installation slot 160 of the fixed iron 16 through the annular flange 312 through interference fit, that is, the outer diameter of the annular flange 312 is greater than the maximum inner diameter of the installation slot 160.

[0049] Continue to refer Figure 2 , Figure 4 and Figure 5 The lateral sealing rubber member 32 generally includes a base 321 and a sealing lip 322. The base 321 is provided with a sealing lip 322 on both sides, and the two sealing lips 322 are bent away from each other. The upper and lower sealing lips 322 cooperate with the valve core 17 to form a dynamic sealing pair, so as to provide dynamic sealing when the valve core 17 falls and returns. At the same time, the base 321 needs to be accommodated in the installation notch 160 and does not contact the valve core 17.

[0050] Further, considering the possible leakage between the lateral sealing rubber member 32 and the fixed iron 16, for this purpose, preferably, the base 321 of the lateral sealing rubber member 32 is interference-fitted with the fixed iron 16 at a preset position to form a static sealing pair, thereby further sealing the leakage channel between the fixed iron 16 and the dynamic sealing structure 20. Specifically, the base 321 is interference-fitted with the mounting notch 160 of the fixed iron 16 at a preset position, for example, at least one of the upper surface, the lower surface and the outer peripheral surface of the base 32 is interference-fitted with the fixed iron 16.

[0051] It is also found that when the base 321 directly interferes with the fixed iron 16, the plane sealing deformation of the base 321 is too large, and the deformation of the base 321 is easily transmitted to the sealing lip 322 area, affecting the sealing effect of the sealing lip 322. Therefore, preferably, an annular protrusion 323 is provided on the outer surface of the base 321, and the annular protrusion 323 is located between the fixed iron 16 and the base 321, and is interference-fitted with the fixed iron 16 to form a static sealing pair, while the base 321 needs to be clearance-fitted with the fixed iron 16 without contact. Optionally, an annular protrusion 323 is provided on at least one of the upper surface, the lower surface and the outer peripheral surface of the base 321. The annular protrusion 323 is one or more. Under the same sealing effect, compared with the direct interference fit between the base 321 and the fixed iron 16, the annular protrusion 323 can be designed with a smaller interference amount, which does not affect the sealing effect of the sealing lip 322.

[0052] Preferably, the upper surface and the lower surface of the base 321 are both provided with an annular protrusion 323, and the annular protrusion 323 can be symmetrical or asymmetrical up and down. Preferably, the annular protrusion 323 is symmetrically arranged up and down. In addition, the annular protrusion 323 is arranged as far away from the sealing lip 322 as possible, for example, it is arranged close to the outer peripheral surface of the base 321, so as to reduce or avoid the deformation of the annular protrusion 323 being transmitted to the sealing lip 322 area, affecting the sealing effect of the main leakage channel.

[0053] The annular protrusion 323 can be made into various shapes, such as at least one of a dot shape, a line shape, and a surface shape, and can also be a sharp, blunt, round, non-round, etc. shape, as long as the annular protrusion 323 can have a certain interference with the corresponding groove wall on the installation groove 160. More preferably, the annular protrusion 323 is a dot structure, for example, the annular protrusion 323 is a single convex point structure (see Figure 4 ), or the annular protrusion 323 is a multi-convex structure (see Figure 5 ). The multi-bump structure can be a double-bump structure or other multi-bump structures. The multi-bump structure is preferred, as the local contact stress is higher and the sealing is more reliable than the plane. It should be understood that there are depressions between adjacent bumps in the multi-bump structure.

[0054] In this embodiment, the annular protrusion 323 adopts a double convex point structure, the local contact stress of the double convex points is relatively high, and the sealing effect is reliable. Optionally, when the annular protrusion 323 is a double convex point structure, each convex point can be set to an arc shape, and the arc radius, the distance between the two convex points and the convex point height can be reasonably set according to actual needs. For example, optionally, when there is no interference fit, the two convex point radii of the annular protrusion 323 are consistent, the convex point radius is 0.3 to 0.5 mm, and the convex point height is 0.15 to 0.3 mm. Of course, the actual situation is not limited to this. It should be noted that when the annular protrusion 323 is a single convex point, it means that the annular protrusion 323 has only one maximum height at a corresponding position; when the annular protrusion 323 is a multi-convex point, it means that the annular protrusion 323 has a maximum height at multiple corresponding positions.

[0055] Specifically, when the dynamic seal assembly 20 is installed, a portion of the installation slot 160 is connected to the metal frame 31 by interference fit, and another portion of the installation slot 160 is used to accommodate the lateral sealing rubber member 32. Figure 2As shown, in one embodiment, the installation notch 160 is a stepped structure, including an interference fit groove 161, a rubber receiving groove 162 and a sealing lip receiving groove 1633 which are arranged in sequence from the inside to the outside in the radial direction. The "inside" and "outside" described here are relative to the position of the central axis of the fixed iron 16, and the "inside" is a position farther away from the central axis of the fixed iron 16, and the "outside" is a position closer to the central axis of the fixed iron 16. That is, the rubber receiving groove 162 is arranged outside the interference fit groove 161, and the sealing lip receiving groove 163 is arranged outside the rubber receiving groove 162, and the sealing lip receiving groove 163 is close to the valve core 17.

[0056] Thus, the metal skeleton 31 is connected with the interference fit groove 161 by interference fit, the base 321 of the lateral sealing rubber member 32 is located in the rubber receiving groove 162, and the sealing lip 322 of the lateral sealing rubber member 32 is located in the sealing lip receiving groove 163. The sealing lip 322 protrudes from the sealing lip receiving groove 163 in the radial direction of the fixed iron 16 to fit on the outer surface of the valve core 17. The sealing lip receiving groove 163 can accommodate the sealing lip 322 when the sealing lip 322 is deformed by force. In addition, the installation notch 160 axially penetrates the bottom of the fixed iron 16 close to the valve seat 18, so that the bottom of the installation notch 160 is open, thereby facilitating the processing of the fixed iron 16 and facilitating the installation of the dynamic seal assembly 20. Therefore, the installation notch 160 is open in the radial direction toward the valve core 17 and in the axial direction toward the valve seat 18. It should also be understood that the interference fit groove 161 , the rubber receiving groove 162 and the sealing lip receiving groove 163 are all concave structures arranged around the fixed iron 16 .

[0057] Based on this, Figure 2 and Figure 3 As shown, the outer ring surface 3101 of the metal skeleton 31 is connected with the interference fit groove 161 by interference fit, and the lower surface 3102 of the metal skeleton 31 does not contact the valve seat 18 but leaves a gap. Specifically in this embodiment, the annular flange 312 is connected with the fixed iron 16 by interference fit through its outer ring surface 3101. In addition, refer to Figure 2 , and see detail part C, after the lateral sealing rubber part 32 covers the central cylinder 311 and part of the annular flange 312, the lateral sealing rubber part 32 and the valve seat 18 are matched with each other in a clearance to avoid contact between the lateral sealing rubber part 32 and the valve seat 18, so that deformation of the sealing rubber part 32 can be prevented, and the sealing performance of the dynamic sealing structure 20 can be further ensured. Specifically in this embodiment, a notch can be provided at the upper end of the valve seat 18 close to the fixed iron 16 to avoid the lateral sealing rubber part 32 and avoid contact with the lateral sealing rubber part 32.

[0058] In summary, it can be seen that in the technical solution provided by the embodiment of the present invention, whether axial air intake or radial air intake, the upward and downward gas pressures received by the valve core 17 during operation can be equalized, which not only makes the opening operation of the valve port 181 more comfortable and controllable, but also makes the response speed faster, and when closing 181, the sealing effect of the valve port 181 is better and the sealing performance is more stable. On the other hand, the dynamic seal assembly 20 is assembled with the fixed iron 16 and connected as a whole to form an independent fixed iron assembly for use, which simplifies the structure of the dynamic seal and reduces the assembly difficulty and processing cost of the dynamic seal. In particular, by setting an annular protrusion 323 on the lateral sealing rubber part 32 to have an interference fit with the fixed iron 16, the sealing performance is enhanced, while avoiding the influence on the sealing lip 322. Furthermore, when the valve core 17 adopts a variable diameter structure, the risk of deformation and damage of the lateral sealing rubber part 32 during use can be greatly reduced, which not only ensures the sealing performance, but also greatly prolongs the service life of the lateral sealing rubber part 32.

[0059] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the present invention and its equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A stiffness valve, characterized in that: It comprises a fixed iron, a valve core and a valve seat; the valve core is sleeved inside the fixed iron and the valve seat; the valve core can move axially relative to the fixed iron and the valve seat to selectively open or close the valve port on the valve seat; and the valve core is arranged so that the force-bearing areas of the upper and lower surfaces are equal, so that the upward and downward gas pressures on the valve core are equal.

2. The stiffness valve according to claim 1, characterized in that: The diameter of the sealing contact surface between the valve core and the valve port is equal to the maximum outer diameter of the valve core.

3. The stiffness valve according to claim 2, characterized in that: The valve core has a first diameter section and a second diameter section, the outer diameter of the second diameter section is larger than the outer diameter of the first diameter section, the first diameter section and the second diameter section are alternately arranged, and the diameter of the sealing contact surface is equal to the outer diameter of the second diameter section; or, the valve core is an equal diameter structure.

4. The stiffness valve according to claim 1 or 2, characterized in that: It also includes a dynamic sealing component, which is located between the valve core and the fixed iron; the dynamic sealing component includes a metal frame and a lateral sealing rubber part; the lateral sealing rubber part is installed on the metal frame; and the metal frame is connected to the installation groove on the fixed iron by interference fit, and the valve seat and the lateral sealing rubber part are clearance fit.

5. The stiffness valve according to claim 4, characterized in that: The lateral sealing rubber component and the metal frame are integrally formed by rubber vulcanization.

6. The stiffness valve according to claim 4, characterized in that: The lateral sealing rubber component includes a base and a sealing lip; one sealing lip is arranged on the upper and lower sides of the outside of the base; the two sealing lips are bent away from each other; an annular protrusion is arranged on the outer surface of the base; the annular protrusion and the fixed iron are interference fit to form a static sealing pair, and the base and the fixed iron are clearance fit.

7. The stiffness valve according to claim 6, characterized in that The annular protrusion is disposed on both the upper surface and the lower surface of the base, and the annular protrusion is disposed away from the sealing lip.

8. The stiffness valve according to claim 6, characterized in that: The annular protrusion is a single-convex point structure or a multi-convex point structure.

9. The stiffness valve according to claim 6, characterized in that: The installation slot comprises an interference fit slot, a rubber receiving slot and a sealing lip receiving slot which are arranged in sequence from the inside to the outside in the radial direction and are distributed in a stepped manner; the metal frame is connected to the interference fit slot by interference fit; the base is located in the rubber receiving slot, and the sealing lip is located in the sealing lip receiving slot; the sealing lip protrudes from the sealing lip receiving slot in the radial direction of the fixed iron; the installation slot axially penetrates the bottom of the fixed iron, so that the bottom of the installation slot is open.

10. The stiffness valve according to claim 4, characterized in that: The metal skeleton includes a central column, an annular flange is arranged on the outer peripheral surface of the central column, the two ends of the annular flange along the axial direction are shorter than the central column, the annular flange is connected to the mounting slot by interference fit, and / or, a plurality of through holes are arranged radially on the central column of the metal skeleton, and the plurality of through holes are evenly distributed.

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