Rigidity valve

Abstract

The invention 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 invention, 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 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. Vehicles with air springs have better driving smoothness and driving stability when driving on tortuous roads due to the use of air springs, 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. And as an important component of the air spring system, the existence of the stiffness valve enables the air suspension system to achieve variable volume additional air chambers, switchable characteristic curves, and settable sports or comfort mode switching. Therefore, the demand for stiffness valves is also increasing. At present, the rigidity valve commonly used in the automotive industry belongs to the normally open solenoid valve; when the rigidity valve is not energized, the valve port is opened, and the air flows between the two valve chambers through the radial channel on the valve seat; after the rigidity valve is energized, the valve core moves downward under the action of electromagnetic force and contacts the valve seat, closing the valve port, so that the channel between the two valve chambers is cut off, and the valve port is in a sealed state. At this time, it is necessary to ensure the dynamic sealing of the circumferential gap between the valve core and the fixed iron, and further cut off the flow channel between the two valve chambers. The dynamic seal between the valve core and the fixed iron is usually composed of sealing rubber and a plastic skeleton. As an independent component, it is positioned and installed between the valve core and the fixed iron, and the position of the dynamic sealing structure needs to be limited by the valve seat and the fixed iron at the same time. Although this kind of dynamic sealing structure can achieve a sealing effect to a certain extent, it has a complex structure, is difficult to position and install, and has a high processing cost. In addition, most importantly, the sealing rubber is prone to wear during long-term use, resulting in a reduction in the sealing interference, and thus the dynamic sealing performance cannot be guaranteed.

[0003] 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

[0004] The object of the present invention is to provide a rigidity valve to solve the problems in the existing rigidity valve that the dynamic sealing rubber is easily worn out, resulting in reduced sealing performance, and the dynamic seal has a complex structure, high assembly difficulty and high cost.

[0005] To achieve the above-mentioned purpose, the present invention also provides a rigidity valve, which includes a valve seat, a valve core, a fixed iron and a dynamic sealing rubber part; the valve core is sleeved in 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; 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 in 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.

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

[0007] Optionally, the cross-section of the first groove along the axial direction has a constant height.

[0008] Optionally, when the mounting portion is interference fitted in the first groove of the valve core, the valve core includes a main body and a valve port sealing mounting portion; the valve port sealing mounting portion is used to install the valve port sealing rubber; the first groove is set on the outer peripheral wall of the main body; and the inner peripheral wall on the fixed iron that cooperates with the sealing lip is a variable diameter.

[0009] Optionally, the cross-section of the second groove along the axial direction has a constant height.

[0010] Optionally, when the dynamic sealing rubber component is interference-fitted in the second groove of the fixed iron, one end of the sealing lip has an interference fit with the valve core, and the other end of the sealing lip has a clearance fit with the valve core.

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

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

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

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

[0015] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0016] In the aforementioned rigidity valve, by interference fitting the dynamic sealing rubber part on the fixed iron or valve core, the structure of the dynamic seal is simplified, the difficulty of positioning and installing the dynamic seal is reduced, the processing cost is reduced, and the sealing effect of the integrated dynamic seal is better. In particular, after the dynamic sealing rubber part is worn, the interference of the sealing lip can be compensated by the action of high pressure, and the sealing performance can be adaptively adjusted, so that the sealing effect of the dynamic sealing rubber part will not be reduced after long-term use, thereby effectively ensuring the sealing performance and increasing the stability of the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0018] Figure 1 It is a structural schematic diagram of the stiffness valve in the preferred embodiment 1 of the present invention;

[0019] Figure 2 yes Figure 1 A partial enlarged view of detail A of the medium-rigidity valve. Figure 2 The horizontal arrow shown indicates the expansion direction of the dynamic sealing rubber member, and the downward arrow indicates the gas pressure on the upper surface of the dynamic sealing rubber member;

[0020] Figure 3 It is a structural schematic diagram of the stiffness valve in the second preferred embodiment of the present invention;

[0021] Figure 4 yes Figure 3 A partial enlarged view of detail B of a medium-rigidity valve. Figure 4 The horizontal arrow shown indicates the expansion direction of the dynamic sealing rubber member, and the downward arrow indicates the gas pressure on the upper surface of the dynamic sealing rubber member;

[0022] Figure 5 It is a schematic diagram of the dimensions of the sealing lip in a preferred embodiment of the present invention.

[0023] In the attached figure:

[0024] 1-electromagnetic module, 2-sleeve, 3-armature, 4-connecting rod, 5-spring, 6-fixed iron, 61-second groove, 7-valve core, 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 part, 150-center of dynamic sealing rubber part, 151-installing part, 152-sealing lip, 16-limiting rubber, D1-inner diameter of dynamic sealing rubber part, D2-outer diameter of first groove, D3-outer diameter of dynamic sealing rubber part, D4-inner diameter of second groove, H1-height of installing part, H2-height of first groove or second groove, R_inner_top-minimum distance, R_inner_bottom-maximum distance. DETAILED DESCRIPTION

[0025] 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.

[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 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.

[0027] As used in this specification, the singular forms "one", "an", and "the" include plural objects, and the plural form "a plurality" includes more than two 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 a connection between two elements or an interactive 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.

[0028] The "outer peripheral wall" and "inner peripheral wall" described in this application document are 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, and the radial direction is the horizontal direction.

[0029] The purpose of the present invention is to provide a rigidity valve to solve the problem that the dynamic seal rubber in the existing rigidity valve is easily worn and thus the sealing performance is reduced, and at the same time, it is also used to solve the problem that the dynamic seal in the existing rigidity valve has a complex structure, is difficult to install, and has a high processing cost. The following is a description with reference to the accompanying drawings.

[0030] [Example 1]

[0031] Figure 1 Schematic diagram of the structure of the stiffness valve in the preferred embodiment 1 of the present invention, Figure 2 for Figure 1 Enlarged view of detail A of the medium stiffness valve.

[0032] like Figure 1 and Figure 2 As 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 housing 9. And usually, the stiffness valve also includes sealing rings 11, 12 and 13. Figure 1 It can be seen that a sealing ring 11 is arranged on the outer side of the top end of the housing 9, a sealing ring 13 is arranged on the outer side of the bottom end of the valve seat 8, and a sealing ring 12 is arranged between the fixed iron 6 and the housing 9. It should be known that the number and position of the sealing rings 11, 12 and 13 can be reasonably adjusted according to actual conditions, and this application does not limit this.

[0033] The positional relationship of the above parts is now explained in an exemplary manner. Specifically, the electromagnetic module 1 is partially arranged in the shell 9 and is fixedly connected to 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 along the axial direction of the stiffness valve, and the fixed iron 6 is arranged below the armature 3, and the fixed iron 6 needs to remain stationary; in addition, the upper end of the fixed iron 6 is connected to the sleeve 2, and the lower end of the fixed iron 6 is fixedly fitted with the shell 9. Schematically, the fixed iron 6 and the sleeve 2 are first interference-connected and then welded; in addition, the valve core 7 is fitted in the fixed iron 6 and the valve seat 8, and 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 seat 8. Valve mouth 81; and the valve seat 8 is fixedly connected to 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 to the armature 3, and the lower end of the connecting rod 4 is fixedly connected to the valve core 7. Schematically, the connecting rod 4 is interference-connected with the armature 3 and the valve core 7 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 its elastic potential energy, pushes the armature 3 to drive the valve core 7 to move upward and reset; in addition, two through holes are often set at the connection between the inner hole of the valve core 7 and the connecting rod 4, which are used to connect the cavities on the upper and lower sides of the valve core 7.

[0034] The working principle of the above-mentioned stiffness valve is as follows: when the electromagnetic module 1 is energized, the armature 3 moves downward under the action of the 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, closes the valve port 81, and cuts off the channel between the two valve chambers a and b. A valve port sealing rubber 14 is provided at the bottom where the valve core 7 contacts the valve port 81. The valve port sealing rubber 14 is used to seal the valve port 81. At the same time, the seal between the fixed iron 6 and the valve core 7 is achieved by the dynamic seal 10. On the contrary, when the electromagnetic module 1 is de-energized, 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, connects the channel between the two valve chambers a and b, and allows air to flow between the two valve chambers a and b.

[0035] Different from the prior art, in the dynamic sealing method provided in this embodiment, only one dynamic sealing rubber member 15 is provided, and the dynamic sealing rubber member 15 is interference-fitted in the first groove 71 of the valve core 7. It should be understood that the dynamic sealing rubber member 15 is an annular structure, and during interference fitting, the inner diameter D1 of the dynamic sealing rubber member 15 is less than the outer diameter D2 of the first groove 71, that is, interference fitting refers to the interference fit of the dynamic sealing rubber member 15 with the valve core 7 in the radial direction. Therefore, in this embodiment, a dynamic sealing pair is formed by the dynamic sealing rubber member 15 and the inner peripheral wall of the fixed iron 6 to ensure the dynamic sealing performance.

[0036] It can be seen that in the rigidity valve provided in the first embodiment, the frame for installing the dynamic sealing rubber is omitted. Compared with the dynamic sealing method in the traditional rigidity valve, it is no longer necessary to limit the position of the dynamic seal through the cooperation of the valve seat 8 and the fixed iron 6, thereby simplifying the structure of the dynamic seal, reducing the positioning and installation requirements of the dynamic seal, reducing the difficulty of positioning and installation of the dynamic seal, reducing the processing cost, and the sealing effect of this integrated dynamic seal is better.

[0037] In addition, the dynamic sealing rubber part 15 includes a mounting portion 151 and a sealing lip 152; the sealing lip 152 is arranged outside the mounting portion 151 away from the central axis of the valve core 7. The sealing lip 152 is usually arranged in an inclined shape. In this embodiment, the sealing lip 152 is inclined toward 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 the sealing lips 152 can be adjusted and changed according to the model and size of the air spring stiffness valve, and generally two are sufficient. In this embodiment, a sealing lip 152 is arranged on the upper and lower sides of the outside of the mounting portion 151, and the two sealing lips 152 are bent away from each other to withstand forces from different directions, so as to ensure that the sealing lips 152 are reliably sealed when subjected to force to avoid air leakage. There is a certain amount of interference between any of the sealing lips 152 and the inner circumferential wall of the fixed iron 6 to achieve a good sealing effect.

[0038] In addition, during the life cycle, due to the dynamic sealing cooperation between the dynamic sealing rubber member 15 and the inner peripheral wall of the fixed iron 6, the sealing lip 152 will wear, resulting in a reduction in the sealing interference, and thus the sealing performance cannot be guaranteed. Figure 2 , and combined with Figure 1 The advantages of using interference fit for the dynamic sealing rubber member 15 are:

[0039] When the valve port 81 is closed and the axial chamber (b) of the valve seat 8 is at high pressure (P1), the high pressure (P1) can pass through the through hole between the connecting rod 4 and the valve core 7 and the gap between the dynamic sealing rubber member 15 and the valve core 7 in sequence, and act on the upper surface of the dynamic sealing rubber member 15, so that the dynamic sealing rubber member 15 is deformed under the action of the groove wall 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 member 15 expands outward toward the fixed iron 6, which increases the interference 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 at high pressure, the interference between the lower sealing lip 152 and the fixed iron 6 can also be increased.

[0040] Therefore, the interference fit of the dynamic sealing rubber member 15 solves the above problem well. After the rubber is worn, the interference between the upper and lower sealing lips 152 and the fixed iron 6 is compensated by the force of high pressure, so as to realize the adaptive adjustment of the sealing performance and ensure the sealing performance. Therefore, the sealing effect of the dynamic sealing rubber member 15 of this embodiment will not be reduced after long-term use, which increases the stability of the sealing performance.

[0041] Furthermore, if Figure 2 As shown, the height H1 of the mounting portion 151 is less than, equal to or greater than the height H2 of the first groove 71. Preferably, the height H1 of the mounting portion 151 is less than the height H2 of the first groove 71, that is, in the axial direction, there is a gap between the mounting portion 151 and the first groove 71, which can better promote the dynamic sealing rubber member 15 to expand and deform outward in the radial direction toward the fixed iron 6.

[0042] This embodiment also provides a valve core assembly, which includes: a valve core 7 and a dynamic sealing rubber member 15; the mounting portion 151 of the dynamic sealing rubber member 15 is interference-fitted in the first groove 71 of the valve core 7, and the sealing lip 152 of the dynamic sealing rubber member 15 protrudes from the first groove 71 in the radial direction, and has a certain interference with the inner peripheral wall of the fixed iron 6, and the inner peripheral wall of the fixed iron 6 can be set to a constant diameter or a variable diameter, where the constant diameter or variable diameter refers to the inner diameter. When the inner peripheral wall of the fixed iron 6 is a variable diameter, the dynamic sealing method is basically the same or similar to the dynamic sealing method of the main body of the valve core 7 in the following embodiment 2, and will not be described in detail here.

[0043] like Figure 1As shown, the valve core assembly generally also includes a limit rubber 16, which is arranged at the top of the valve core 7 and can play an anti-collision role. The limit rubber 16 is embedded in the mounting hole at the top of the valve core 7 by interference fit or vulcanization molding, and the specific installation method is not limited. The valve core assembly may also include the aforementioned valve port sealing rubber 14, which is arranged at the bottom of the valve core 7. The valve port sealing rubber 14 is installed 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 molding. Specifically, the valve core 7 may include a main body and a valve port sealing mounting portion, the valve port sealing mounting portion is arranged at the bottom end of the main body, and is used to install the valve port sealing rubber 14, and the outer peripheral wall of the main body is provided with a first groove 71.

[0044] As mentioned above, the dynamic sealing rubber member 15 is an annular structure as a whole, and therefore needs to be arranged around the valve core 7. Accordingly, 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 member 15 is embedded in the first groove 71. As can be seen from the figure, there is no metal matrix of the valve core embedded between the upper and lower sealing lips 152 of the dynamic sealing rubber member 15, and the upper and lower sealing lips 152 are not separated by the metal matrix of the valve core. The thickness of the entire dynamic sealing rubber member 15 in the radial direction will not be consumed by the valve core 7, so that the dynamic sealing rubber member 15 has sufficient thickness in the radial direction to ensure its strength.

[0045] Furthermore, the first groove 71 can be made into any suitable shape. Figure 2 As shown, preferably, the cross-section of the first groove 71 along the axial direction is set at the same height, or in other words, the cross-section of the first groove 71 along the axial direction is a rectangle with equal height, and this interference fitting effect is good.

[0046] Optionally, a lip receiving groove may be provided outside the first groove 71 to accommodate the sealing lip 152. The sealing lip 152 protrudes from the lip receiving groove in the radial direction of the valve core 7 to fit on the inner circumferential wall of the fixed iron 6. When the sealing lip 152 is deformed by force, the lip receiving groove may accommodate the sealing lip 152, providing an accommodating space for the deformation of the sealing lip 152 during operation. It should also be known that in other cases, the lip receiving groove may not be provided.

[0047] [Example 2]

[0048] Figure 3 is a structural schematic diagram of a rigidity valve in a preferred embodiment 2 of the present invention, Figure 4 yes Figure 3 A partial enlarged view of detail B of a medium-stiffness valve. Please refer to Figure 3 to Figure 4 The stiffness valve provided in the second embodiment of the present invention is basically the same as the stiffness valve provided in the first embodiment, and the same parts will not be described again. Only the differences will be described below.

[0049] like Figure 3 to Figure 4 As shown, in the rigidity valve provided in the second embodiment, the dynamic sealing rubber member 15 is interference-fitted in the second groove 61 of the fixed iron 6. It can be understood that during the interference fitting, the outer diameter D3 of the dynamic sealing rubber member 15 is greater than the inner diameter D4 of the first groove 61, and as in the first embodiment, the dynamic sealing rubber member 15 is interference-fitted with the fixed iron 6 in the radial direction. Therefore, in the present embodiment, a dynamic sealing pair is formed by the dynamic sealing rubber member 15 and the outer peripheral wall of the valve core 7 to ensure the dynamic sealing performance.

[0050] Similarly, in the rigidity valve provided in the second embodiment, the technical effect of the interference fit of the dynamic sealing rubber member 15 is substantially the same as or similar to that of the first embodiment, and will not be described in detail herein.

[0051] Similarly, the dynamic sealing rubber member 15 is arranged around the fixed iron 6. Accordingly, 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 member 15 is embedded in the second groove 61. As can be seen from the figure, there is no fixed iron metal matrix embedded between the upper and lower sealing lips 152 of the dynamic sealing rubber member 15, and the upper and lower sealing lips 152 are not separated by the fixed iron metal matrix. The thickness of the entire dynamic sealing rubber member 15 in the radial direction will not be consumed by the fixed iron 6, so that the dynamic sealing rubber member 15 has sufficient thickness in the radial direction to ensure its strength.

[0052] Similar to the arrangement of the first groove 71, preferably, the height H1 of the mounting portion 151 is smaller than the height H2 of the second groove 61, forming a gap in the axial direction, which is conducive to the high-pressure compression dynamic sealing rubber member 15 to achieve sealing adaptation. The second groove 61 can also be made into any suitable shape. Figure 4 As shown, preferably, the cross-section of the second groove 61 along the axial direction is set at the same height, or in other words, the cross-section of the second groove 61 along the axial direction is a rectangle with equal height, and this interference fitting effect is good.

[0053] This embodiment also provides a fixed iron assembly, which includes: 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 from the second groove 61 in the radial direction, and there is a certain interference with the outer peripheral wall of the valve core 7.

[0054] In this embodiment, the valve core 7 is a main body except for the valve port sealing installation part, and the main body is used to cooperate with the dynamic sealing rubber part 15 to form a dynamic sealing pair. And the main body of the valve core 7 adopts a constant diameter or a variable diameter, where the constant diameter or the variable diameter refers to the outer diameter. When the main body of the valve core 7 has a fixed outer diameter, it can reduce the assembly requirements of the dynamic sealing pair between the dynamic sealing rubber part 15 and the valve core 7, thereby reducing the processing difficulty and processing cost of the valve core 7. When the main body of the valve core 7 is a variable diameter, it can reduce the risk of deformation and damage of the dynamic sealing rubber part 15 during use, while ensuring the sealing performance, extending the service life of the dynamic sealing rubber part 15.

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

[0056] As described in the first embodiment, the sealing lip 152 is usually arranged in an inclined shape. In this embodiment, the sealing lip 152 is inclined toward the valve core 7. In other words, the inner diameter of the sealing lip 152 increases from one end to the other end in the axial direction. Preferably, one end of the sealing lip 152 is interference fit with the valve core 7, and the other end of the sealing lip 152 is clearance fit with the valve core 7 to avoid excessive contact area of ​​the sealing lip 152 and excessive wear. Here, the upper sealing lip 152 is taken as an example for exemplary description, such as Figure 5 As shown, during operation, the upper end (i.e., one end) of the sealing lip 152 is interference-fitted with the valve core 7 to achieve dynamic sealing, and the lower end (i.e., the other end) of the sealing lip 152 is clearance-fitted with the valve core 7. In addition, in the initial state, that is, when not in use, the upper end of the sealing lip 152 for interference-fitting with the valve core 7 has a minimum distance R_inner_top relative to the center 150 of the dynamic sealing rubber member 15, and the lower end of the sealing lip 152 for clearance-fitting with the valve core 7 has a maximum distance R_inner_bottom relative to the center 150 of the dynamic sealing rubber member 15. The minimum distance ensures that the upper end of the sealing lip 152 is interference-fitted with the valve core 7, and the maximum distance ensures that 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 ≤7.3 mm; at this distance, under low temperature conditions, the sealing lip 152 and the valve core 7 can still be in stable contact with each other, thereby ensuring the reliability of the seal.

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

[0059] It should also be noted that, regardless of the first or second embodiment, the dynamic sealing rubber member 15 is preferably not in contact with the valve seat 8, that is, a gap is left between the dynamic sealing rubber member 15 and the valve seat 8 to prevent the dynamic sealing rubber member 15 from deforming after being stressed, thereby reducing its service life. As can be seen from the figure, the dynamic sealing rubber member 15 is separated from the valve seat 8 by the fixed iron 6, and the dynamic sealing rubber member 15 does not contact the valve seat 8.

[0060] In summary, it can be seen that according to the technical solution provided by the embodiment of the present invention, by interference fitting the dynamic sealing rubber part 15 on the fixed iron 6 or the valve core 7, the structure of the dynamic seal is simplified, the positioning and installation requirements of the dynamic seal are reduced, the positioning and installation difficulty of the dynamic seal is reduced, the processing cost is reduced, and the sealing effect of this integrated dynamic seal is better. In particular, after the dynamic sealing rubber part 15 is worn, the interference of the upper and lower sealing lips 152 can be compensated by the action of high pressure, and the sealing performance is self-adapted, so that the sealing effect of the dynamic sealing rubber part 15 will not be reduced after a long time of use, and the stability of the sealing performance is increased.

[0061] 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 valve seat, a valve core, a fixed iron and a dynamic sealing rubber part; the valve core is sleeved in 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; the dynamic sealing rubber part comprises a mounting portion and a sealing lip; the mounting portion is interference fitted in the first groove of the valve core or in 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 according to claim 1, characterized in that: When the dynamic sealing rubber part is interference fitted in the first groove of the valve core, the axial height of the mounting portion is smaller than the axial height of the first groove; when the dynamic sealing rubber part is interference fitted in the second groove of the fixed iron, the axial height of the mounting portion is smaller than the axial height of the second groove.

3. The stiffness valve according to claim 1, characterized in that: The cross-section of the first groove along the axial direction has a constant height.

4. The stiffness valve according to claim 1, characterized in that: When the mounting portion is interference fitted in the first groove of the valve core, the valve core includes a main body and a valve port sealing mounting portion, the valve port sealing mounting portion is used to install the valve port sealing rubber, the outer peripheral wall of the main body is provided with the first groove; and the inner peripheral wall on the fixed iron that cooperates with the sealing lip is a variable diameter.

5. The stiffness valve according to claim 1, characterized in that: The cross-section of the second groove along the axial direction has a constant height.

6. The stiffness valve according to claim 1, characterized in that: 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 according to claim 6, characterized in that One end of the sealing lip that is interference fit with the valve core has a minimum distance relative to the center of the dynamic sealing rubber component, and the other end of the sealing lip that is clearance fit with the valve core has a maximum distance relative to the center of the dynamic sealing rubber component, the minimum distance is less than or equal to 7.3mm, and the maximum distance is 7.75mm~7.85mm.

8. The stiffness valve according to claim 7, characterized in that: The maximum distance is 7.8 mm.

9. The stiffness valve according to claim 1, characterized in that: When the mounting portion is interference fitted in the second groove of the fixed iron, the main body portion of the valve core that cooperates with the sealing lip is a variable diameter structure.

10. The stiffness valve according to claim 1, characterized in that The valve seat and the dynamic sealing rubber component are separated by the fixed iron.

Images