Rigidity valve

Abstract

The utility model provides a rigidity valve. The rigidity valve comprises a valve seat, a valve element, fixed iron and a movable sealing rubber part. 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 dynamic sealing rubber part comprises a mounting part and a sealing lip; the mounting part is assembled in the first groove of the valve core or the second groove of the fixed iron in an interference manner; the first groove is located in the peripheral wall of the valve element. The second groove is located in the inner circumferential wall of the fixed iron. According to the utility model, the structure of the dynamic seal is simplified, the assembly difficulty and the processing cost of the dynamic seal are reduced, and the self-adaptive adjustment of the dynamic seal is realized, so that the sealing effect cannot be reduced after the dynamic seal rubber part is used for a long time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air spring technical field, especially relate to a rigidity valve. BACKGROUND

[0002] With the development of the automobile industry, the consumer market for automobile positioning is changing. End consumers no longer only regard the automobile as a means of transport, and the automobile has become a carrier and space 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 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 rigidity 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 rigidity valve is also more and more big. The rigidity valve commonly used in the current automobile industry belongs to a normally open electromagnetic valve; when the rigidity 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 rigidity 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 plastic skeleton, which is positioned and installed between the valve core and the fixed iron as an independent component, and the position of the dynamic seal structure needs to be limited by the valve seat and the fixed iron at the same time. 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. In addition, most importantly, the sealing rubber is prone to wear during long-term use, which reduces the sealing interference and further affects the dynamic sealing performance.

[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 rigidity valve to solve the problems of easy wear of dynamic sealing rubber in the existing rigidity valve, leading to sealing performance decline, and complex structure, high assembly difficulty and high cost of dynamic sealing.

[0005] To achieve the above object, the utility model provides a kind of rigidity valve, it includes valve seat, valve core, fixed iron and dynamic sealing rubber part;The fixed iron and the valve seat sleeve the valve core;The valve core can be moved in axial direction relative to the fixed iron and the valve seat, to selectively open or close the valve port on the valve seat;Dynamic sealing rubber part includes mounting portion and sealing lip;The mounting portion is interference fitted in the first recess of the valve core or the second recess of the fixed iron;The first recess is located on the outer peripheral wall of the valve core;The second recess is located on the inner peripheral wall of the fixed iron.

[0006] Optionally, when the dynamic sealing rubber part is interference fitted in the first recess of the valve core, the height of the mounting portion in axial direction is less than the height of the first recess in axial direction;When the dynamic sealing rubber part is interference fitted in the second recess of the fixed iron, the height of the mounting portion in axial direction is less than the height of the second recess in axial direction.

[0007] Optionally, the cross section of the first recess in axial direction is equal height.

[0008] Optionally, when the mounting portion is interference fitted in the first recess of the valve core, the valve core includes main body part and valve port sealing mounting portion;The valve port sealing mounting portion is used to install valve port sealing rubber;The outer peripheral wall of the main body part is provided with the first recess;And the inner peripheral wall of the fixed iron matched with the sealing lip is variable diameter.

[0009] Optionally, the cross section of the second recess in axial direction is equal height.

[0010] Optionally, when the dynamic sealing rubber part is interference fitted in the second recess of the fixed iron, one end of the sealing lip is interference fitted with the valve core, and the other end of the sealing lip is gap fitted with the valve core.

[0011] Optionally, the one end of the sealing lip interference fitted with the valve core has minimum distance relative to the center of the dynamic sealing rubber part, and the other end of the sealing lip gap fitted with the valve core has maximum distance relative to the center of the dynamic sealing rubber part, the minimum distance is less than or equal to 7.3mm, and the maximum distance is 7.75mm-7.85mm.

[0012] Optionally, the maximum distance is 7.8mm.

[0013] Optionally, when the mounting portion is interference fitted in the second recess of the fixed iron, the main body part of the valve core matched with the sealing lip is variable diameter structure.

[0014] Optionally, the valve seat and the dynamic sealing rubber part are separated by the fixed iron.

[0015] Compared with the prior art, the technical scheme of the utility model has at least the following beneficial effects:

[0016] In the foregoing rigidity valve, the dynamic sealing rubber part is interference-fitted on the fixed iron or the valve core, the structure of the dynamic sealing is simplified, the positioning and installation difficulty of the dynamic sealing is reduced, the processing cost is reduced, and the sealing effect of the integrated dynamic sealing is better. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are used to better understand the utility model, and do not constitute undue limitation on the utility model. Among them:

[0018] Figure 1 is a structural schematic view of the rigidity valve in the preferred embodiment one of the utility model;

[0019] Figure 2 is Figure 1 is a partial enlarged view of the rigidity valve about detail A, Figure 2 The transverse arrow shown indicates the expansion direction of the dynamic sealing rubber part, and the downward arrow indicates the gas pressure on the upper surface of the dynamic sealing rubber part;

[0020] Figure 3 is a structural schematic view of the rigidity valve in the preferred embodiment two of the utility model;

[0021] Figure 4 is Figure 3 is a partial enlarged view of the rigidity valve about detail B, Figure 4 The transverse arrow shown indicates the expansion direction of the dynamic sealing rubber part, and the downward arrow indicates the gas pressure on the upper surface of the dynamic sealing rubber part;

[0022] Figure 5 is a size schematic view of the sealing lip in the preferred embodiment of the utility model.

[0023] In the drawings:

[0024] 1 - electromagnetic module, 2 - sleeve, 3 - armature, 4 - connecting rod, 5 - spring, 6 - fixed iron, 61 - second groove, 7 - spool, 71 - first groove, 8 - valve seat, 81 - valve port, 9 - housing, 11, 12, 13 - sealing ring, a, b - valve cavity, 10 - dynamic seal, 14 - valve port sealing rubber, 15 - dynamic sealing rubber, 150 - center of dynamic sealing rubber, 151 - mounting portion, 152 - sealing lip, 16 - limiting rubber, D1 - inner diameter of dynamic sealing rubber, D2 - outer diameter of first groove, D3 - outer diameter of dynamic sealing rubber, D4 - inner diameter of second groove, H1 - height of mounting portion, H2 - height of first groove or second groove, R_inner_top - minimum distance, R_inner_bottom - maximum distance. DETAILED DESCRIPTION

[0025] Other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the present specification. The present application can also be implemented or applied in other different specific embodiments, and each detail in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the present embodiment only schematically illustrate the basic concept of the present application, and thus the drawings only show the components related to the present application, not the number, shape and size of the components when actually implemented. The type, number and proportion of each component when actually implemented can be randomly changed, and the layout type of the components can also be more complex.

[0026] 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 application 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, thereby increasing the flexibility of the present application when implemented.

[0027] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “multiple” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “installed,” “connected,” and “linked” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be mechanical or electrical. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two elements or an interaction between two elements. Relational terms such as “first,” “second,” etc., are used merely to distinguish one entity or operation from another, 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 specify the number of indicated technical features. It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] As described in this application, "outer peripheral wall" and "inner peripheral wall" are both surfaces arranged circumferentially around the central axis of the stiffness valve. "Axial" refers to the direction along the central axis of the stiffness valve, "circumferential" is the direction around the central axis of the stiffness valve, and "radial" is the direction perpendicular to the central axis of the stiffness valve, which is the transverse direction.

[0029] The purpose of this invention is to provide a stiffness valve to solve the problem of decreased sealing performance caused by easy wear of the dynamic seal rubber in existing stiffness valves. It also addresses the issues of complex structure, difficult installation, and high processing costs associated with the dynamic seal in existing stiffness valves. The following description is in conjunction with the accompanying drawings.

[0030] Example 1

[0031] Figure 1 This is a schematic diagram of the stiffness valve in the preferred embodiment of this utility model. Figure 2 for Figure 1 Enlarged view of detail A of the medium stiffness valve.

[0032] As Figure 1 and Figure 2 shown, in some embodiments, the stiffness valve includes electromagnetic module 1, sleeve 2, armature 3, connecting rod 4, spring 5, fixed iron 6, valve core 7, valve seat 8, and shell 9, etc. And usually, the stiffness valve also includes sealing rings 11, 12 and 13. As can be seen from Figure 1 , the sealing ring 11 is arranged outside the top end of the shell 9, the sealing ring 13 is arranged outside the bottom end of the valve seat 8, and the sealing ring 12 is arranged between the fixed iron 6 and the shell 9. It should be understood that 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.

[0033] The positional relationship of the above parts will now be described. Specifically, the electromagnetic module 1 is partially arranged in the shell 9 and fixedly connected with the shell 9; the sleeve 2 is located between the electromagnetic module 1 and the armature 3, and also between the electromagnetic module 1 and the fixed iron 6; and the armature 3 and the fixed iron 6 are arranged in the axial direction of the stiffness valve, with the fixed iron 6 arranged below the armature 3 and required to remain stationary; in addition, the upper end of the fixed iron 6 is connected with the sleeve 2, and the lower end of the fixed iron 6 is fixedly sleeved with the shell 9, illustratively, the fixed iron 6 and the sleeve 2 are first connected with interference, and then welded; further, the fixed iron 6 and the valve core 7 are sleeved in the valve seat 8, the valve core 7 can move in the axial direction relative to the fixed iron 6 and the valve seat 8, thereby selectively opening or closing the valve port 81 on the valve seat 8; and the valve seat 8 is fixedly connected with the fixed iron 6 and the shell 9, respectively; at the same time, the fixed iron 6, the valve core 7, the spring 5 and the armature 3 are all sleeved on the connecting rod 4; the upper end of the connecting rod 4 is fixedly connected with the armature 3, and the lower end of the connecting rod 4 is fixedly connected with the valve core 7, illustratively, the connecting rod 4 is connected with the armature 3 and the valve core 7 with interference, respectively; and the lower end of the spring 5 is limited on the fixed iron 6, and the upper end of the spring 5 is limited on the armature 3; when the electromagnetic module 1 is powered off, the spring 5 releases the elastic potential energy, pushes the armature 3 to drive the valve core 7 to move upward and reset; in addition, the inner hole of the valve core 7 is usually provided with two through holes at the connection with the connecting rod 4, for connecting the cavities on the upper and lower sides of the valve core 7.

[0034] The working principle of the above stiffness valve is as follows: when the electromagnetic module 1 is powered on, the armature 3 moves downward under the action of electromagnetic force, and drives the connecting rod 4 and the valve core 7 to move downward until the valve core 7 contacts the valve seat 8, the valve port 81 is closed, the passage between the two valve cavities a and b is cut off, and the bottom of the valve core 7 in contact with the valve port 81 is provided with a valve port sealing rubber 14 for sealing the valve port 81, and at the same time, the sealing between the fixed iron 6 and the valve core 7 is realized by the dynamic sealing 10; on the contrary, when the electromagnetic module 1 is powered off, the armature 3 moves upward under the action of the spring 5, synchronously drives the connecting rod 4 and the valve core 7 to move upward, opens the valve port 81, and connects the passage between the two valve cavities a and b, so that air flows between the two valve cavities a and b.

[0035] Unlike the prior art, the dynamic sealing mode provided in the embodiment provides only one dynamic sealing rubber 15, and the dynamic sealing rubber 15 is interference-fitted in the first groove 71 of the valve core 7. It should be understood that the dynamic sealing rubber 15 is an annular structure, and when interference-fitted, the inner diameter D1 of the dynamic sealing rubber 15 is smaller than the outer diameter D2 of the first groove 71, that is, the dynamic sealing rubber 15 is interference-fitted with the valve core 7 in the radial direction. Therefore, in the embodiment, the dynamic sealing pair is formed by the cooperation of the dynamic sealing rubber 15 and the inner circumferential wall of the fixed iron 6, and the dynamic sealing performance is ensured.

[0036] As can be seen, in the stiffness valve provided in the embodiment, the skeleton for installing the dynamic sealing rubber is omitted, compared with the dynamic sealing mode in the traditional stiffness valve, it is no longer necessary to limit the position of the dynamic sealing by the cooperation of the valve seat 8 and the fixed iron 6, thereby simplifying the structure of the dynamic sealing, reducing the positioning and installation requirements of the dynamic sealing, reducing the positioning and installation difficulty of the dynamic sealing, reducing the processing cost, and the sealing effect of the integrated dynamic sealing is better.

[0037] In addition, the dynamic sealing rubber 15 includes a mounting portion 151 and a sealing lip 152; the mounting portion 151 is provided with the sealing lip 152 away from the outer part of the central axis of the valve core 7. The sealing lip 152 is usually provided in an inclined manner, and in the embodiment, the sealing lip 152 is inclined towards the fixed iron 6, or in other words, the outer diameter of the sealing lip 152 increases from one end to the other end in the axial direction. It should be noted that the number of sealing lips 152 can be adjusted and changed according to different models and sizes of air spring stiffness valves, and two sealing lips 152 can be provided. In the embodiment, the outer part of the mounting portion 151 is provided with one sealing lip 152 on each of the upper and lower sides, and the two sealing lips 152 are bent away from each other to withstand forces from different directions, so as to ensure reliable sealing of the sealing lip 152 when subjected to force and avoid air leakage. There is a certain interference amount between any sealing lip 152 and the inner circumferential wall of the fixed iron 6 to achieve good sealing effect.

[0038] In addition, during the life cycle, the sealing lip 152 will be worn due to the dynamic sealing cooperation between the dynamic sealing rubber part 15 and the inner circumferential wall of the fixed iron 6, which will result in the decrease of the interference amount and the failure to guarantee the sealing performance. In this regard, please refer to Figure 2 , and in combination with Figure 1 , the interference assembly of the dynamic sealing rubber part 15 has the following advantages:

[0039] When the valve port 81 is closed and the axial chamber (b) of the valve seat 8 is under high pressure (P1), the high pressure (P1) can act on the upper surface of the dynamic sealing rubber part 15 through the through hole between the connecting rod 4 and the valve core 7 and the gap between the dynamic sealing rubber part 15 and the valve core 7 in sequence, which will cause the dynamic sealing rubber part 15 to be deformed under the action of the first groove 71 and the high pressure (P1), and the deformation is further transmitted to the radial direction, so that the dynamic sealing rubber part 15 expands outward in the direction of the fixed iron 6, which increases the interference amount between the upper sealing lip 152 and the fixed iron 6. Similarly, when the valve port 81 is closed and the radial chamber (a) of the valve seat 8 is under high pressure, the interference amount between the lower sealing lip 152 and the fixed iron 6 can also be increased.

[0040] Therefore, the interference assembly of the dynamic sealing rubber part 15 solves the above problems, and after the rubber is worn, the interference amount between the upper and lower sealing lips 152 and the fixed iron 6 is compensated by the action of the high pressure, which realizes the self-adaptive adjustment of the sealing performance and guarantees the sealing performance. Therefore, the sealing effect of the dynamic sealing rubber part 15 of the embodiment will not decrease after long-term use, which increases the stability of the sealing performance.

[0041] Furthermore, as shown in Figure 2 , the height H1 of the mounting part 151 is less than, equal to or greater than the height H2 of the first groove 71. Preferably, the height H1 of the mounting part 151 is less than the height H2 of the first groove 71, that is, there is a gap between the mounting part 151 and the first groove 71 in the axial direction, which can better promote the dynamic sealing rubber part 15 to expand and deform outward in the radial direction.

[0042] The embodiment also provides a valve core assembly, which comprises the valve core 7 and the dynamic sealing rubber part 15; the mounting part 151 of the dynamic sealing rubber part 15 is interference assembled in the first groove 71 of the valve core 7, and the sealing lip 152 of the dynamic sealing rubber part 15 protrudes in the radial direction from the first groove 71 and has a certain interference amount with the inner circumferential wall of the fixed iron 6, and the inner circumferential wall of the fixed iron 6 can be designed as an equal diameter or a variable diameter, where the equal diameter or the variable diameter refers to the inner diameter. When the inner circumferential wall of the fixed iron 6 is a variable diameter, the dynamic sealing mode is basically the same as or similar to the dynamic sealing mode of the variable diameter of the main body part of the valve core 7 in the second embodiment, which will not be described here.

[0043] As shown in Figure 1As shown, the valve core assembly usually further comprises a limiting rubber 16 arranged at the top of the valve core 7, which can prevent collision. The limiting rubber 16 is embedded in the mounting hole at the top end of the valve core 7 by interference fit or vulcanization, and the specific mounting manner is not limited. The valve core assembly can further comprise the valve port sealing rubber 14 arranged at the bottom of the valve core 7. The valve port sealing rubber 14 is arranged at the bottom of the valve core 7 by various measures, and is preferably integrally formed at the bottom of the valve core 7 by vulcanization. Specifically, the valve core 7 can comprise a main body and a valve port sealing mounting portion arranged at the bottom end of the main body for mounting the valve port sealing rubber 14, and the outer peripheral wall of the main body is provided with a first groove 71.

[0044] As described above, the dynamic sealing rubber 15 is annular in whole, and thus needs to be arranged around the valve core 7. Correspondingly, the outer peripheral wall of the valve core 7 is provided with a circumferentially continuous first groove 71, and the mounting portion 151 of the dynamic sealing rubber 15 is embedded in the first groove 71. As shown, the upper and lower sealing lips 152 of the dynamic sealing rubber 15 are not embedded in the valve core metal base, and the upper and lower sealing lips 152 are not separated by the valve core metal base, and the thickness of the dynamic sealing rubber 15 in the radial direction is not consumed by the valve core 7, so that the dynamic sealing rubber 15 has sufficient thickness in the radial direction to ensure its strength.

[0045] Further, the first groove 71 can be made into any suitable shape. For example, Figure 2 As shown, preferably, the cross section of the first groove 71 in the axial direction is of equal height, or in other words, the cross section of the first groove 71 in the axial direction is of equal height rectangular, which has good interference fit effect.

[0046] Optionally, the outer portion of the first groove 71 can be provided with a lip accommodating groove for accommodating the sealing lip 152. And the sealing lip 152 protrudes from the lip accommodating groove in the radial direction of the valve core 7 to be attached to the inner peripheral wall of the fixed iron 6. The lip accommodating groove can accommodate the sealing lip 152 when the sealing lip 152 is deformed under force, and provide accommodation space for the deformation of the sealing lip 152 during operation. It should be understood that in other cases, the lip accommodating groove can not be provided.

[0047]

Embodiment Two

[0048] Figure 3 is a structure schematic view of the rigidity valve in the preferred embodiment two of the utility model, Figure 4 is Figure 3 a partial enlarged view of the rigidity valve about detail B. Please refer to Figure 3 to Figure 4 The rigidity valve provided in the embodiment two of the utility model is basically the same as the rigidity valve provided in the embodiment one, and the same parts will not be described again, and only the different points will be described below.

[0049] As Figure 3 to Figure 4 shown, in the rigidity valve provided by the second embodiment, the dynamic sealing rubber part 15 is interference fitted in the second groove 61 of the fixed iron 6. It can be understood that when interference fitted, the outer diameter D3 of the dynamic sealing rubber part 15 > the inner diameter D4 of the first groove 61, and as in the first embodiment, the dynamic sealing rubber part 15 is interference fitted with the fixed iron 6 in the radial direction. Therefore, in this embodiment, the dynamic sealing pair is formed by the dynamic sealing rubber part 15 cooperating with the outer peripheral wall of the valve core 7, thereby ensuring the dynamic sealing performance.

[0050] Similarly, in the rigidity valve provided by the second embodiment, the technical effect of interference fitting of the dynamic sealing rubber part 15 is basically the same as or similar to that of the first embodiment, and here, no further description is given.

[0051] Similarly, the dynamic sealing rubber part 15 is arranged around the fixed iron 6. Correspondingly, the inner peripheral wall of the fixed iron 6 is provided with a circumferentially continuous second groove 61, and the mounting portion 151 of the dynamic sealing rubber part 15 is embedded in the second groove 61. As can be seen from the figure, the upper and lower sealing lips 152 of the dynamic sealing rubber part 15 are not embedded in the fixed iron metal base, and the upper and lower sealing lips 152 are not separated by the fixed iron metal base. The thickness of the entire dynamic sealing rubber part 15 in the radial direction is not consumed by the fixed iron 6, so that the dynamic sealing rubber part 15 has sufficient thickness in the radial direction, thereby ensuring its strength.

[0052] Similarly to the setting mode of the first groove 71, preferably, the height H1 of the mounting portion 151 is less than the height H2 of the second groove 61, thereby forming a gap in the axial direction, which is beneficial to the sealing self-adaptation of the high-pressure compression dynamic sealing rubber part 15. The second groove 61 can also be made into any suitable shape. As Figure 4 shown, preferably, the cross section of the second groove 61 in the axial direction is set to be of equal height, or in other words, the cross section of the second groove 61 in the axial direction is of equal-height rectangle, and such interference fitting effect is good.

[0053] The second embodiment also provides a fixed iron assembly, which comprises: a fixed iron 6 and a dynamic sealing rubber part 15; the mounting portion 151 of the dynamic sealing rubber part 15 is interference fitted in the second groove 61 of the fixed iron 6, and the sealing lip 152 of the dynamic sealing rubber part 15 protrudes in the radial direction from the second groove 61 and has a certain interference amount with the outer peripheral wall of the valve core 7.

[0054] In this embodiment, the valve core 7, except for the valve port sealing mounting portion, is entirely a main body. This main body is used to mate with the dynamic sealing rubber component 15 to form a dynamic sealing pair. Furthermore, the main body of the valve core 7 can have a constant or variable diameter, where constant or variable diameter refers to the outer diameter. When the main body of the valve core 7 has a fixed outer diameter, the assembly requirements of the dynamic sealing pair between the dynamic sealing rubber component 15 and the valve core 7 can be reduced, thereby reducing the processing difficulty and cost of the valve core 7. When the main body of the valve core 7 has a variable diameter, the risk of deformation and damage to the dynamic sealing rubber component 15 during use can be reduced, extending the service life of the dynamic sealing rubber component 15 while ensuring sealing performance.

[0055] In this embodiment, the main body of the valve core 7 has a variable diameter structure. When the valve port 81 is open, the upper and lower sealing lips 152 of the dynamic sealing rubber component 15 cooperate with the two small diameter sections on the valve core 7, and the deformation of the sealing lips 152 is small. When the valve port 81 is closed, the upper and lower sealing lips 152 of the dynamic sealing rubber component 15 cooperate with the two large diameter sections on the valve core 7, and the deformation of the sealing lips 152 is large, ensuring sealing performance and providing sufficient effective sealing time.

[0056] As described in Embodiment 1, the sealing lip 152 is typically inclined. In this embodiment, the sealing lip 152 is inclined towards the valve core 7; in other words, the inner diameter of the sealing lip 152 increases axially from one end to the other. Preferably, one end of the sealing lip 152 is press-fitted with the valve core 7, and the other end is clearance-fitted with the valve core 7 to avoid excessive wear due to an excessively large contact area. Here, the upper sealing lip 152 is used as an example for illustrative explanation. Figure 5 As shown, during operation, the upper end (one end) of the sealing lip 152 is press-fitted with the valve core 7 to achieve a dynamic seal, while the lower end (the other end) of the sealing lip 152 is clearance-fitted with the valve core 7. Furthermore, in the initial state, i.e., when not in use, the upper end of the sealing lip 152 that is press-fitted with the valve core 7 has a minimum distance R_inner_top relative to the center 150 of the dynamic sealing rubber component 15, and the lower end of the sealing lip 152 that is clearance-fitted with the valve core 7 has a maximum distance R_inner_bottom relative to the center 150 of the dynamic sealing rubber component 15. The minimum distance ensures the upper end of the sealing lip 152 is press-fitted with the valve core 7, and the maximum distance ensures the lower end of the sealing lip 152 is clearance-fitted with the valve core 7. Similarly, the lower sealing lip 152 is also configured in this way.

[0057] Preferably, the minimum distance is ≤7.3mm; at this distance, even under low temperature conditions, the sealing lip 152 and the valve core 7 can still maintain stable contact, ensuring the reliability of the seal.

[0058] Preferably, the maximum distance is 7.75mm-7.85mm; the distance can ensure that the contact force of the dynamic sealing rubber piece 15 is small, and at the same time, the maximum strain of the dynamic sealing rubber piece 15 is less than 30%, thereby prolonging the service life of the dynamic sealing rubber piece 15. In particular, the maximum distance is 7.8mm which is optimal. It should be noted that the maximum distance is negatively correlated with the contact force of the dynamic sealing rubber piece 15, and positively correlated with the strain, so when the maximum distance is larger, the contact force is smaller, and the normal strain is larger, therefore, the maximum distance should be reasonably set to be in an optimal state.

[0059] It should be further noted that, whether it is the first embodiment or the second embodiment, the dynamic sealing rubber piece 15 is preferably not in contact with the valve seat 8, that is, a gap is left between the dynamic sealing rubber piece 15 and the valve seat 8, so as to avoid deformation of the dynamic sealing rubber piece 15 after being stressed, and to reduce the service life thereof. As can be seen from the drawings, the dynamic sealing rubber piece 15 is separated from the valve seat 8 by the fixed iron 6, and the dynamic sealing rubber piece 15 is not in contact with the valve seat 8.

[0060] As can be seen from the above, according to the technical scheme provided by the embodiment of the present application, by means of the interference assembly of the dynamic sealing rubber piece 15 on the fixed iron 6 or the valve core 7, the structure of the dynamic sealing is simplified, the positioning and installation requirements of the dynamic sealing are reduced, the positioning and installation difficulty of the dynamic sealing is reduced, the processing cost is reduced, and the sealing effect of the integrated dynamic sealing is better. In particular, after the dynamic sealing rubber piece 15 is worn, the interference amount of the upper and lower sealing lips 152 can also be compensated by the action of high pressure, the self-adaptation of the sealing performance is realized, the sealing effect of the dynamic sealing rubber piece 15 after long-term use is not reduced, and the stability of the sealing performance is increased.

[0061] Although the present application is disclosed as above, it is not limited thereto. Those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Therefore, if these modifications and variations of the present application fall within the scope of the present application and equivalent technologies thereof, the present application also intends to include these modifications and variations.

Claims

1. A stiffness valve characterized by, The valve seat, the valve core, the fixed iron and the dynamic sealing rubber part; the fixed iron and the valve seat are sleeved with the valve core; the valve core can move in the axial direction relative to the fixed iron and the valve seat to selectively open or close the valve port on the valve seat; the dynamic sealing rubber part includes a mounting portion and a sealing lip; the mounting portion is interference fitted in the first groove of the valve core or the second groove of the fixed iron; the first groove is located on the outer peripheral wall of the valve core; the second groove is located on the inner peripheral wall of the fixed iron.

2. The stiffness valve of claim 1, wherein When the dynamic sealing rubber part is interference fitted in the first groove of the valve core, the height of the mounting portion in the axial direction is less than the height of the first groove in the axial direction; when the dynamic sealing rubber part is interference fitted in the second groove of the fixed iron, the height of the mounting portion in the axial direction is less than the height of the second groove in the axial direction.

3. The stiffness valve of claim 1, wherein The cross section of the first groove in the axial direction is of equal height.

4. The stiffness valve of claim 1, wherein When the mounting portion is interference fitted in the first groove of the valve core, the valve core includes a main body portion and a valve port sealing mounting portion for installing a valve port sealing rubber, and the outer peripheral wall of the main body portion is provided with the first groove; and the inner peripheral wall of the fixed iron cooperating with the sealing lip is of variable diameter.

5. The stiffness valve of claim 1, wherein The cross section of the second groove in the axial direction is of equal height.

6. The stiffness valve of claim 1, wherein When the mounting portion is interference fitted in the second groove of the fixed iron, one end of the sealing lip is interference fitted with the valve core, and the other end of the sealing lip is clearance fitted with the valve core.

7. The stiffness valve of claim 6, wherein The one end of the sealing lip interference fitted with the valve core has a minimum distance relative to the center of the dynamic sealing rubber part, and the other end of the sealing lip clearance fitted with the valve core has a maximum distance relative to the center of the dynamic sealing rubber part, the minimum distance is less than or equal to 7.3mm, and the maximum distance is 7.75mm-7.85mm.

8. The stiffness valve of claim 7, wherein, The maximum distance is 7.8mm.

9. The stiffness valve of claim 1, wherein When the mounting portion is interference fitted in the second groove of the fixed iron, the main body portion of the valve core cooperating with the sealing lip is of variable diameter structure.

10. The stiffness valve of claim 1, wherein The valve seat and the dynamic sealing rubber part are separated by the fixed iron.

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