Rigidity valve

Abstract

The invention discloses a rigidity valve which comprises an end socket component, a valve seat, a valve block and a sealing assembly. The valve block is inserted into the sealing assembly, and the valve block can move in the axial direction relative to the sealing assembly so as to close or open the valve port part of the valve seat; the valve block is in sliding sealing fit with the sealing assembly; a valve cavity of the valve seat is provided with an upward first step face, the first step face supports the sealing assembly, and the sealing head part abuts against the upper end face of the sealing assembly in a pressing mode. The periphery of the sealing assembly is provided with a sealing protrusion protruding outwards, the sealing protrusion has the elastic deformation capacity, and the sealing protrusion abuts against the cavity circumferential wall face, located above the first step face, of the valve cavity. According to the rigidity valve, the machining difficulty can be reduced by optimizing the structure of the sealing component.

Description

Technical Field

[0001] This application relates to the field of valve device technology, and in particular to a stiffness valve. Background Technology

[0002] The suspension system of a car is closely related to its safety, comfort, and handling. To meet higher requirements for vehicle comfort and handling, air suspension systems have become one of the development directions for suspension systems. Air springs are key components in automotive air suspension systems that directly affect vehicle performance. Multi-chamber air springs, such as dual-chamber and triple-chamber air springs, have greater application advantages than single-chamber air springs due to their adjustable stiffness and wide stiffness adjustment range.

[0003] The stiffness adjustment of multi-chamber air springs, such as dual-chamber and triple-chamber air springs, depends on the stiffness valve. Taking a dual-chamber air spring as an example, the connection between the main chamber and the secondary chamber can be controlled by opening and closing the stiffness valve, thereby adjusting the stiffness of the dual-chamber air spring. Specifically, when the stiffness valve is open, the main chamber and the secondary chamber of the dual-chamber air spring are connected, the volume of compressible gas increases, and the stiffness of the dual-chamber air spring decreases; when the stiffness valve is closed, the main chamber and the secondary chamber of the dual-chamber air spring are not connected, the volume of compressible gas decreases, and the stiffness of the dual-chamber air spring increases.

[0004] In related technologies, a rigid valve includes a head, a seat, a core iron, a mandrel, and a sealing block. The mandrel passes through the head and can move axially relative to the head. The upper end of the mandrel is fixed relative to the core iron, and the lower end of the mandrel is fixed relative to the sealing block. Through the excitation of the coil, the core iron, via the mandrel, can drive the sealing block to abut against or move away from the valve port of the valve seat, thereby realizing the valve opening or closing action.

[0005] The rigidity valve has a sealing component between the end cap and the valve seat. This sealing component has a sealing structure that seals with the end cap and a sealing structure that seals with the valve seat. When the valve is closed, the sealing component also needs to seal with the sealing block. The sealing component has a large number of sealing structures and cooperates with different structural parts. The dimensional accuracy requirements for the sealing component are high, which makes the processing difficult. Summary of the Invention

[0006] The purpose of this application is to provide a stiffness valve that reduces manufacturing difficulty through structural optimization of the sealing components.

[0007] To solve the above-mentioned technical problems, this application provides a stiffness valve, including a head component, a valve seat, a valve block, and a sealing assembly;

[0008] The valve block is inserted into the sealing assembly, and the valve block can move axially relative to the sealing assembly to close or open the valve port of the valve seat; the valve block and the sealing assembly are in a sliding sealing fit.

[0009] The valve seat has a valve cavity with an upward-facing first stepped surface, which supports the sealing assembly, and the end cap component presses against the upper end surface of the sealing assembly;

[0010] The outer periphery of the sealing assembly has an outwardly protruding sealing protrusion, which has elastic deformation capability and abuts against the peripheral wall of the valve cavity located above the first stepped surface.

[0011] Using the above scheme, the end cap component presses the sealing assembly against the first step surface of the valve seat. The seal between the end cap component and the valve seat is achieved through the interference fit between the sealing protrusion of the sealing assembly and the circumferential wall of the valve cavity. The sealing assembly only needs one sealing structure, namely the sealing protrusion, to achieve the seal between the end cap component and the valve seat. This eliminates the need for two separate sealing structures on the sealing assembly, reducing the number of sealing structures required and lowering the dimensional accuracy control requirements for the sealing assembly. This also helps to reduce the machining difficulty of the sealing assembly and its mating components.

[0012] In one possible implementation, the valve block includes a block body portion, which is of equal diameter; the sealing assembly has an insertion hole portion that guides and engages with the block body portion; the sealing assembly is provided with two sealing lips in annular shape, which are arranged axially and have elastic deformation capability; the sealing lips abut against the block body portion.

[0013] In one possible implementation, the sealing assembly includes a support and a seal, the seal being integrated with the support, the support having a higher hardness than the seal, the sealing lip and the sealing protrusion being formed on the seal, and the insertion hole being formed on the support.

[0014] In one possible implementation, the support member includes a cylindrical portion fixedly embedded in the seal, the insertion hole portion being formed in the cylindrical portion, and the two sealing lips being located at the upper and lower ends of the cylindrical portion, respectively.

[0015] In one possible implementation, the seal includes a sealing sleeve portion and a sealing ring portion. The sealing ring portion extends radially outward from the outer peripheral wall of the sealing sleeve portion. Two sealing lips are respectively provided at the upper end and lower end of the inner hole wall of the sealing sleeve portion. The outer peripheral portion of the sealing ring portion protrudes from the outer peripheral surface of the support member to form the sealing protrusion. The cylindrical portion is fixedly embedded in the inner hole of the sealing sleeve portion.

[0016] In one possible implementation, the sealing ring portion is located in the central region of the sealing sleeve portion in the axial direction; the support member further includes a first support portion and a second support portion, the first support portion and the second support portion being located at the upper end and the lower end of the sealing ring portion, respectively.

[0017] In one possible implementation, the sealing lip is also tilted to one axial direction, and the two sealing lips are tilted in opposite directions in the axial direction.

[0018] In one possible implementation, the two sealing lips are a first sealing lip and a second sealing lip, with the first sealing lip located above the second sealing lip, the first sealing lip tilted upward along the axial direction, and the second sealing lip tilted downward along the axial direction.

[0019] In one possible implementation, the outer peripheral wall of the sealing protrusion is an outwardly convex arc-shaped surface.

[0020] In one possible implementation, the end cap component includes a connecting portion and an end cap. The end cap includes a main body and an extension portion extending downward from the lower end of the main body. A downward-facing stepped surface is formed at the connection between the extension portion and the main body. The extension portion is fixedly inserted into the inner hole of the connecting portion. The stepped surface abuts against the upper end face of the connecting portion, and the lower end face of the connecting portion abuts against the upper end face of the sealing assembly.

[0021] In one possible implementation, the connecting portion and the sealing head are welded together; the inner hole of the connecting portion has a downward-facing second stepped surface, and there is an axial gap between the second stepped surface and the upper end face of the sealing assembly, and there is also an axial gap between the lower end face of the extension and the upper end face of the sealing assembly. Attached Figure Description

[0022] Figure 1 This is a cross-sectional schematic diagram of a stiffness valve provided in one embodiment of this application;

[0023] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0024] Figure 3 for Figure 2 A magnified view of a portion A1 in the middle;

[0025] Figure 4 This is a schematic diagram of the sealing assembly in a specific embodiment.

[0026] Explanation of reference numerals in the attached figures:

[0027] Valve seat 10, valve port 11, valve cavity 12, first step surface 121, cavity peripheral wall surface 122;

[0028] End cap component 20, end cap head 21, main body 211, extension 212, stepped surface 213, connecting part 22, second stepped surface 222.

[0029] Valve block 31, block body 311, block connecting part 312, sealing element 32, buffer 33;

[0030] Sealing assembly 40, insertion hole 401, support member 41, first support portion 411, second support portion 412, third stepped surface 4122, cylindrical portion 413, sealing member 42, sealing sleeve portion 42A, sealing ring portion 42B, first sealing lip 421a, second sealing lip 421b, sealing protrusion 422.

[0031] 61. Mandrel 62. Core iron 63. Coil 64. Sleeve 65. Magnetic housing 65. End cap 66. Terminal block 67. Elastic element 68. Detailed Implementation

[0032] The stiffness valve provided in this application embodiment can be used to adjust the stiffness of a multi-chamber air spring. The stiffness of the multi-chamber air spring can be adjusted by changing the connection between the main chamber and the secondary chamber through the stiffness valve.

[0033] In this article, the directional term "axial" refers to the direction parallel to the longitudinal centerline of the stiffness valve. From the perspective shown in the figure, the axial direction is the up-down direction of the paper. The directional term "outer" refers to the direction relatively far away from the longitudinal centerline of the stiffness valve, and "inner" refers to the direction relatively close to the longitudinal centerline of the stiffness valve.

[0034] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Please refer to Figures 1 to 4 , Figure 1 This is a cross-sectional schematic diagram of a stiffness valve provided in one embodiment of this application; Figure 2 for Figure 1 A magnified view of part A in the middle; Figure 3 for Figure 2 A magnified view of a portion A1 in the middle; Figure 4 This is a schematic diagram of the sealing assembly in a specific embodiment.

[0036] In this embodiment, the stiffness valve includes a valve seat 10, a head component 20, a valve block 31, a spindle 61, a core iron 62, a coil 63, a sleeve 64, a magnetically conductive outer shell 65, an end cap 66, a terminal block 67, and an elastic element 68.

[0037] The valve seat 10 has a valve port 11 and a valve cavity 12. A head assembly 20 is fixed to the upper end of the valve seat 10. A sleeve 64 is fixedly connected to the upper end of the head assembly 20, and a core iron 62 located above the head assembly 20 is disposed inside the sleeve 64. The upper end of a spindle 61 is fixedly inserted into the core iron 62, and the lower end passes through the head assembly 20 and is fixedly connected to the valve block 31. An elastic element 68 is provided between the core iron 62 and the head assembly 20. The elastic element 68 can be a spring, which is sleeved on the spindle 61. The spindle 61, core iron 62, and valve block 31 are fixed together and can move axially relative to the head assembly 20 to approach or move away from the valve port 11, thereby closing or opening the valve port 11.

[0038] Part of the coil 63 is sleeved on the sleeve 64, and part of the coil 63 is also sleeved on the end cap component 20; a magnetically conductive outer shell 65 is provided on the outer periphery of the coil 63, and the lower end of the magnetically conductive outer shell 65 is fixedly connected to the valve seat 10 (for example, by riveting); the end cap 66 is sleeved on the upper end of the magnetically conductive outer shell 65 and the lower end of the terminal block 67; the lower end of the terminal block 67 is sleeved on the upper end of the sleeve.

[0039] The coil 63 can be switched between energized and de-energized via the terminal block 67. When the coil 63 is energized, a magnetic field is generated around it. Combined with the magnetic conductivity of the magnetically conductive outer shell 65, the core iron 62 can overcome the elastic force of the elastic element 68 under the action of the magnetic field, and drive the valve block 31 to move axially downward (towards the valve port 11) via the spindle 61 to close the valve port 11. When the coil 63 is de-energized, under the elastic restoring force of the elastic element 68, the core iron 62 can drive the valve block 31 to move axially upward (away from the valve port 11) via the spindle 61 to open the valve port 11. Figure 1 The valve port 11 of the medium stiffness valve is in the open state.

[0040] The stiffness valve has a first interface (not shown in the figure) that communicates with the valve cavity 12 and a second interface 13 that communicates with the valve port 11. When the stiffness valve is applied to the air spring, its first interface can communicate with the secondary cavity of the air spring, and its second interface 13 can communicate with the main cavity of the air spring. In this way, the main cavity and the secondary cavity of the air spring can be in a connected or disconnected state by opening or closing the stiffness valve.

[0041] The end cap component 20 has an end cap cavity that communicates with the valve cavity 12 of the valve seat 10. The valve block 31 is located in the space formed by the end cap cavity and the valve cavity 12. The end cap cavity can guide the axial movement of the valve block 31.

[0042] In one embodiment, a sealing element 32 may be fixedly attached to the bottom of the valve block 31. The sealing element 32 can directly abut against the valve port 11 to seal the valve port 11, thereby ensuring a sealing effect when the valve is closed. For example, the sealing element 32 may be made of a plastic material or a material with a certain degree of elasticity to improve the sealing effect on the valve port 11.

[0043] A buffer member 33 may also be fixed to the top of the valve block 31. When the valve block 31 moves axially upward away from the valve port 11 and abuts against the end cap 20, it can directly contact the end cap 20 through the buffer member 33, thereby reducing wear on the valve block 31 and lowering noise. The buffer member 33 may be made of an elastic material. For example, the elastic material used to make the buffer member 33 may be rubber or the like.

[0044] To prevent internal leakage, the head assembly 20 and the valve seat 10 must be kept sealed; the outer circumferential surface of the valve block 31 must also be kept sealed with the head assembly 20 and the valve seat 10.

[0045] In this embodiment, the stiffness valve also includes a sealing assembly 40, a valve block 31 is inserted into the sealing assembly 40, the valve block 31 can move axially relative to the sealing assembly 40 to close or open the valve port 11 of the valve seat 10, and the valve block 31 and the sealing assembly 40 are in a sliding sealing fit.

[0046] The valve cavity 12 of the valve seat 31 has an upward-facing first stepped surface 121, which supports the sealing assembly 40. The end cap 20 presses against the upper end face of the sealing assembly 40. That is, the end cap 20 presses the sealing assembly 40 against the first stepped surface 121 of the valve seat 31. With the cooperation of the end cap 20 and the first stepped surface 121 of the valve seat 31, the axial position of the sealing assembly 40 is restricted.

[0047] The outer periphery of the sealing assembly 40 has an outwardly protruding sealing protrusion 422, which has elastic deformation capability. The sealing protrusion 422 and the cavity peripheral wall 122 of the valve cavity 12 of the valve seat 10 located above the first step surface 121 are fitted together by interference fit.

[0048] In the above scheme, the end cap component 20 presses the sealing assembly 40 against the first step surface 121 of the valve seat 10. The sealing protrusion 422 of the sealing assembly 40 and the peripheral wall surface 122 of the valve cavity 12 of the valve seat 10 are used to achieve a seal between the end cap component 20 and the valve seat 10. In other words, in the above scheme, the sealing assembly 40 only needs to be provided with one sealing structure, namely the sealing protrusion 422, to achieve a seal between the end cap component 20 and the valve seat 10. It eliminates the need for two sealing structures on the sealing assembly 40 to seal the end cap component 20 and the valve seat 10 respectively. This reduces the number of sealing structures on the sealing assembly 40, lowers the dimensional accuracy control requirements of the sealing assembly 40, and helps reduce the processing difficulty of the sealing assembly 40 and related components that mate with it.

[0049] In practice, the outer peripheral wall of the sealing protrusion 422 is a convex arc surface, which facilitates the sealing assembly 40 and the valve seat 10 to be assembled by radially pressing the sealing protrusion 422 to ensure the sealing effect between the sealing assembly 40 and the valve seat 10.

[0050] In other implementations, the outer peripheral wall of the sealing protrusion 422 can also be other shapes, such as a plane or a polygonal facet.

[0051] In this embodiment, the valve block 31 includes a main body portion 311, which has a constant diameter structure. The sealing assembly 40 has an insertion hole portion 401 that guides and mates with the main body portion 311. The sealing assembly 40 is provided with two annular sealing lips arranged axially. The sealing lips have elastic deformation capability, and the sealing lips and the main body portion 311 of the valve block 31 achieve an abutment fit through an interference fit. Thus, when the valve block 31 moves axially relative to the sealing assembly 40, the two sealing lips of the sealing assembly 40 cooperate with the valve block 31 to achieve a seal between the outer peripheral surface of the valve block 31 and the end cap component 20 and the valve seat 10. It can be understood that the valve block 31 and the sealing assembly 40 have a dynamic sealing fit.

[0052] Clearly, the sealing lip is located on the side where the inner circumference of the sealing assembly 40 is located. The sealing lip protrudes from the wall of the insertion hole portion 401.

[0053] To achieve an interference fit between the sealing lip and the main body 311, the minimum inner diameter of the sealing lip is smaller than the outer diameter of the main body 311.

[0054] The valve block 31 may also include a block connecting portion 312 located at the bottom end of the block body portion 311, which is used to be fixedly connected to the aforementioned sealing element 32.

[0055] The sealing element 32 can be integrally molded with the block connection part 312 by injection molding.

[0056] The cross-section of the block connection 312 is inverted T-shaped, which can restrict the position of the sealing element 32 in the axial direction.

[0057] In this embodiment, the sealing assembly 40 includes a support 41 and a seal 42, which are integrated into one piece. The hardness of the support 41 is greater than that of the seal 42. A sealing lip 421 is formed on the seal 42, and an insertion hole 401 is formed on the support 41.

[0058] The seal 42 can be made of a material with a certain elastic deformation capacity or a soft material that is easily deformable, such as rubber or plastic.

[0059] As mentioned above, the support member 41 can improve the overall structural strength of the sealing assembly 40, and the sealing member 42 can ensure the reliability of the sealing fit with the valve block 31.

[0060] In one implementation, the support member 41 includes a cylindrical portion 413 fixedly embedded in the sealing member 42, and an insertion hole portion 401 formed in the cylindrical portion 413. This can be understood as the insertion hole portion 401 being formed within the cylindrical cavity of the cylindrical portion 413. A first sealing lip 421a and a second sealing lip 421b are located at the upper and lower ends of the cylindrical portion 413, respectively, to ensure that the first sealing lip 421a and the second sealing lip 421b can protrude from the hole wall of the insertion hole portion 401 and are press-fitted with the block body portion 311 of the valve block 31 to achieve an abutment fit.

[0061] In a specific implementation, the sealing element 42 includes a sealing sleeve portion 42A and a sealing ring portion 42B. The sealing ring portion 42B extends radially outward from the outer peripheral wall of the sealing sleeve portion 42A. The first sealing lip 421a and the second sealing lip 421b are respectively provided at the upper end and lower end of the inner hole wall surface of the sealing sleeve portion 42A. The cylindrical portion 413 is fixedly embedded in the inner hole of the sealing sleeve portion 42A.

[0062] The axial dimension of the cylindrical portion 413 is smaller than the axial dimension of the sealing sleeve portion 42A. The sealing sleeve portion 42A includes a portion located at the upper end of the cylindrical portion 413 and a portion located at the lower end of the cylindrical portion 413, so as to facilitate the formation of a first sealing lip 421a and a second sealing lip 421b on the inner wall of the sealing sleeve portion 42A.

[0063] The outer periphery of the sealing ring portion 42B protrudes from the outer periphery of the support member 41 to form a sealing protrusion 422.

[0064] In specific implementation, the sealing ring portion 42B is located in the central region of the sealing sleeve portion 42A in the axial direction. The support member 41 also includes a first support portion 411 and a second support portion 412, which are located at the upper and lower ends of the sealing ring portion 42B, respectively. This provides better support for the sealing ring portion 42B, reduces the axial deformation of the sealing ring portion 42B, and ensures the reliability and effectiveness of the seal between the sealing protrusion 422 of the sealing ring portion 42B and the valve seat 10.

[0065] In a specific implementation, the second support member 412 has a downward-facing third step surface 4122, which abuts against the first step surface 121 of the valve seat 10. That is, the second support member 412 of the support member 41 also includes a portion located below the first step surface 121, which is located inside the valve cavity 12. This arrangement can increase the axial length of the insertion hole portion 401 of the sealing assembly 40, which can play a better guiding role for the axial movement of the valve block 31, thereby ensuring the reliability of the opening and closing valve operation.

[0066] In this embodiment, the sealing lip of the sealing assembly 40 is also inclined to one side axially, and the two sealing lips are inclined in opposite directions axially. In other words, one of the two sealing lips is inclined upward axially, and the other is inclined downward axially.

[0067] The end of the sealing lip that connects to the seal 42 is defined as the root of the sealing lip, and the end of the sealing lip that is away from the seal 42 is defined as the head of the sealing lip. The axial tilt can be defined as the head of the sealing lip being higher or lower than the root of the sealing lip in the axial direction. If the head of the sealing lip is higher than its root, it is considered that the sealing lip is tilted upward in the axial direction. If the head of the sealing lip is lower than its root, it is considered that the sealing lip is tilted downward in the axial direction.

[0068] For ease of description and understanding, the two sealing lips of the sealing assembly 40 are referred to as the first sealing lip 421a and the second sealing lip 421b, respectively. In the illustrated scheme, the first sealing lip 421a is located above the second sealing lip 421b.

[0069] When the valve is closed, there is a space between the outer peripheral surface of the valve block 31 and the end cap component 20, located above the first sealing lip 421a; and there is a space between the outer peripheral surface of the valve block 31 and the valve seat 10, located below the first sealing lip 421b. The pressure in these two spaces may differ. When the pressure in the upper space is too high, it exerts a downward force on the sealing lip, causing it to deform downwards and potentially creating a gap between the sealing lip and the valve block 31, leading to seal failure and increasing the risk of internal leakage. Similarly, when the pressure in the lower space is too high, it exerts an upward force on the sealing lip, causing it to deform upwards and potentially creating a gap between the sealing lip and the valve block 31, leading to seal failure and also increasing the risk of internal leakage.

[0070] With the two sealing lips of the sealing assembly tilted upwards as shown above, in the closed state, the sealing lips themselves tilt axially to one side, maintaining a sealing fit with the valve block 31 in this state, with the two sealing lips tilting in opposite directions. Thus, when the pressure in the upper space region is high and applies downward pressure to the sealing lips, the axially upward-tilted sealing lip deforms downwards under this pressure, reducing its minimum inner diameter, thereby ensuring a seal with the valve block 31 and guaranteeing the sealing effect. Similarly, when the pressure in the lower space region is high and applies upward pressure to the sealing lips, the axially downward-tilted sealing lip deforms upwards under this pressure, reducing its minimum inner diameter, thereby ensuring a seal with the valve block 31 and guaranteeing the sealing effect.

[0071] In a specific implementation, the upper first sealing lip 421a (the sealing lip away from the valve port 11) is inclined upward along the axial direction, and the lower second sealing lip 421b (the sealing lip close to the valve port 11) is inclined downward along the axial direction.

[0072] With the above settings, when the pressure in the space above the first sealing lip 421a is too high in the closed valve state, a downward force is applied to the first sealing lip 421a, causing it to deform downwards. Since the first sealing lip 421a in the inclined state maintains a sealing fit with the valve block 31, after the first sealing lip 421a deforms downwards, it deforms from the inclined state to the flat state. The minimum inner diameter after deformation is still smaller than the outer diameter of the block body portion 311 of the valve block 31, and it can still maintain a sealing fit with the block body portion 311 of the valve block 31. At the same time, the second sealing lip 421b located below is unaffected and maintains a sealing fit with the block body portion 311. Both sealing lips maintain a sealing fit with the block body portion 311 of the valve block 31, resulting in a good sealing effect when the valve is closed. When the valve is closed, if the pressure in the space below the second sealing lip 421b is too high, an upward force is applied to the second sealing lip 421b, causing it to deform upward. Since the second sealing lip 421b in the tilted state maintains a sealing fit with the block body 311, after the second sealing lip 421b deforms upward, it flattens out from the tilted state. The minimum inner diameter after deformation is still smaller than the outer diameter of the block body 311, and it can still maintain a sealing fit with the block body 311. At the same time, the first sealing lip 421a remains unaffected and maintains a sealing fit with the block body 311. Both sealing lips maintain a sealing fit with the block body 311, resulting in a good sealing effect when the valve is closed.

[0073] In other implementations, the lower sealing lip can be angled upwards, and the upper sealing lip downwards. In this case, when the pressure in the upper region is too high, the upper sealing lip may detach from the block body 311 under the downward pressure difference, causing seal failure. Only the lower sealing lip can then provide a seal. Similarly, when the pressure in the lower region is too high, the lower sealing lip may fail, and only the upper sealing lip can provide a seal. Relatively speaking, the sealing reliability is not as good as the illustrated scheme, but this arrangement is acceptable as long as the sealing effect is guaranteed.

[0074] In this embodiment, the end cap component 20 includes an end cap 21 and a connecting portion 22. The end cap 21 includes a main body 211 and an extension 212 extending downward from the lower end of the main body 211. A downward-facing stepped surface 213 is formed at the connection between the extension 212 and the main body 211. The extension 212 is fixedly inserted into the inner hole of the connecting portion 22. The stepped surface 213 abuts against the upper end face of the connecting portion 22, and the lower end face of the connecting portion 22 abuts against the upper end face of the sealing assembly 40. It can be understood that the lower end face of the end cap component 20 includes the lower end face of the connecting portion 22.

[0075] In specific configurations, the head 21 and the connecting part 22 can be designed as separate structures and then fixedly connected. Alternatively, the head 21 and the connecting part 22 can be integrally formed, meaning that the head component 20 is an integrally formed component.

[0076] When the head 21 and the connecting part 22 are separately provided, they can be fixedly connected by welding. Specifically, the extension 212 of the head 21 can be welded to the inner hole of the connecting part 22. At this time, the inner hole wall of the connecting part 22 can be provided with a downward-facing second step surface 222. The second step surface 222 has an axial gap with the upper end face of the sealing assembly 40, and the extension 212 of the head 21 also has an axial gap with the upper end face of the sealing assembly 40. In this way, there is a space between the mating part of the connecting part 22 and the extension 212 and the upper end face of the sealing assembly 40. This space can accommodate the weld seam that may be generated when the connecting part 22 and the extension 212 are welded, and avoid the lower end face of the connecting part 22 from not being able to fit with the lower end face of the sealing assembly 40 due to welding.

[0077] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A stiffness valve, characterized in that, Includes end cap components, valve seats, valve blocks, and sealing assemblies; The valve block is inserted into the sealing assembly, and the valve block can move axially relative to the sealing assembly to close or open the valve port of the valve seat; the valve block and the sealing assembly are in a sliding sealing fit. The valve seat has a valve cavity with an upward-facing first stepped surface, which supports the sealing assembly, and the end cap component presses against the upper end surface of the sealing assembly; The outer periphery of the sealing assembly has an outwardly protruding sealing protrusion, which has elastic deformation capability and abuts against the peripheral wall of the valve cavity located above the first stepped surface.

2. The stiffness valve according to claim 1, characterized in that, The valve block includes a main body portion, which has a constant diameter structure; the sealing assembly has an insertion hole portion that guides and cooperates with the main body portion, and the sealing assembly is provided with two sealing lips in annular structure, which are arranged axially and have elastic deformation capability, and the sealing lips abut against the main body portion.

3. The stiffness valve according to claim 2, characterized in that, The sealing assembly includes a support and a seal, the seal and the support are integrated into one piece, the hardness of the support is greater than the hardness of the seal, the sealing lip and the sealing protrusion are formed in the seal, and the insertion hole is formed in the support.

4. The stiffness valve according to claim 3, characterized in that, The support member includes a cylindrical portion fixedly embedded in the seal, the insertion hole portion is formed in the cylindrical portion, and the two sealing lips are respectively located at the upper and lower ends of the cylindrical portion.

5. The stiffness valve according to claim 4, characterized in that, The sealing element includes a sealing sleeve portion and a sealing ring portion. The sealing ring portion extends radially outward from the outer peripheral wall of the sealing sleeve portion. The two sealing lips are respectively provided at the upper end and lower end of the inner hole wall of the sealing sleeve portion. The outer peripheral portion of the sealing ring portion protrudes from the outer peripheral surface of the support member to form the sealing protrusion. The cylindrical portion is fixedly embedded in the inner hole of the sealing sleeve portion.

6. The stiffness valve according to claim 5, characterized in that, The sealing ring portion is located in the central region of the sealing sleeve portion in the axial direction; the support member also includes a first support portion and a second support portion, the first support portion and the second support portion being located at the upper end and the lower end of the sealing ring portion, respectively.

7. The stiffness valve according to any one of claims 2-6, characterized in that, The sealing lip is also tilted to one side in the axial direction, and the two sealing lips are tilted in opposite directions in the axial direction.

8. The stiffness valve according to claim 7, characterized in that, The two sealing lips are a first sealing lip and a second sealing lip, with the first sealing lip located above the second sealing lip. The first sealing lip is inclined upward along the axial direction, and the second sealing lip is inclined downward along the axial direction.

9. The stiffness valve according to any one of claims 1-6, characterized in that, The outer peripheral wall of the sealing protrusion is a convex arc-shaped surface.

10. The stiffness valve according to any one of claims 1-6, characterized in that, The sealing head component includes a connecting portion and a sealing head. The sealing head includes a main body portion and an extension portion extending downward from the lower end of the main body portion. A downward-facing stepped surface is formed at the connection between the extension portion and the main body portion. The extension portion is fixedly inserted into the inner hole portion of the connecting portion. The stepped surface abuts against the upper end surface of the connecting portion, and the lower end surface of the connecting portion abuts against the upper end surface of the sealing assembly.

11. The stiffness valve according to claim 10, characterized in that, The connecting part and the sealing head are welded and fixed; the inner hole of the connecting part has a downward-facing second stepped surface, and there is an axial gap between the second stepped surface and the upper end face of the sealing assembly, and there is also an axial gap between the lower end face of the extension and the upper end face of the sealing assembly.

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