Rigidity valve

Abstract

The invention discloses a rigidity valve which comprises a valve seat, a valve block and a sealing assembly. The sealing assembly and the valve seat are in limiting connection in the axial direction, 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 a valve port part of the valve seat; the valve block comprises a large-diameter part and a small-diameter part, the large-diameter part is located above the small-diameter part, and a downward first step surface is formed at the joint of the large-diameter part and the small-diameter part; the sealing assembly is provided with an insertion hole part in guide fit with the small-diameter part, the sealing assembly is provided with a sealing lip of an annular structure, and the sealing lip protrudes out of the hole wall face of the insertion hole part; the outer diameter of the small-diameter part is not larger than the minimum inner diameter of the sealing lip, and the outer diameter of the large-diameter part is larger than the minimum inner diameter of the sealing lip. And when the valve block closes the valve port part, the sealing lip deforms under the extrusion action of the first step surface so as to form sealing with the first step surface and the peripheral wall surface of the small-diameter part. According to the rigidity valve, by optimizing a related sealing structure, the valve closing driving force can be reduced, and the valve opening response speed is increased.

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] A sealing structure is provided between the end cap and the valve seat. The outer circumferential surface of the sealing block mates with the inner circumferential surface of the sealing structure. When the sealing block is in the open valve position, away from the valve port, no sealing is required between the sealing block and the sealing structure. When the sealing block is in the closed valve position, abutting against the valve port, a seal is formed between the sealing block and the sealing structure. The sealing structure includes a support member and a sealing element integrally formed on the support member. The inner wall of the sealing element has two inwardly protruding annular protrusions in the axial direction. The sealing block has two large-diameter portions and two small-diameter portions, which are arranged alternately in the axial direction. When the sealing block is in the open valve position, the two annular protrusions of the sealing element correspond to the positions of the two small-diameter portions of the sealing block. When the sealing block is in the closed valve position, the two annular protrusions of the sealing element mate with the two large-diameter portions of the sealing block. The seal is formed by the extrusion deformation of the annular protrusions and the pressure acting on the annular protrusions.

[0006] The sealing fit between the sealing structure and the sealing block is achieved by the compression of the two annular protrusions when the sealing block moves axially. In the initial stage of valve opening and closing, the dynamic friction between the annular protrusions and the sealing block is large, the driving force required to close the valve is large, and the response speed of opening the valve is slow. In addition, there is pressure in the cavity formed between the two annular protrusions and the sealing block. If the pressure is too large, it may compress the annular protrusions and cause internal leakage. Summary of the Invention

[0007] The purpose of this application is to provide a stiffness valve that, through optimization of the relevant sealing structure, can reduce the valve closing drive force and improve the valve opening response speed.

[0008] To solve the above-mentioned technical problems, this application provides a stiffness valve, including a valve seat, a valve block, and a sealing assembly; the sealing assembly is axially connected to the valve seat, 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;

[0009] The valve block includes a large-diameter portion and a small-diameter portion, the large-diameter portion being located above the small-diameter portion, and the connection between the large-diameter portion and the small-diameter portion forming a downward-facing first stepped surface;

[0010] The sealing assembly has an insertion hole portion that guides and mates with the small-diameter portion, and the sealing assembly is provided with a sealing lip in an annular structure, the sealing lip protruding from the hole wall surface of the insertion hole portion;

[0011] The outer diameter of the small diameter portion is not greater than the minimum inner diameter of the sealing lip, and the outer diameter of the large diameter portion is greater than the minimum inner diameter of the sealing lip.

[0012] When the valve block closes the valve port, the sealing lip deforms under the compression of the first step surface to form a seal between the first step surface and the outer peripheral wall of the small diameter portion.

[0013] With the above structure, when the valve block closes the valve port axially downwards relative to the sealing assembly, the first step surface of the valve block moves downwards and contacts the sealing lip. When the first step surface just contacts the sealing lip, the valve port is not fully closed, and the valve block needs to continue moving downwards to close it completely. During this downward movement, since the axial position of the sealing assembly remains unchanged, the first step surface will press against the sealing lip, causing the sealing lip to deform and seal against the first step surface and the outer peripheral wall of the small-diameter portion. With this configuration, the small-diameter portion of the valve block and the sealing lip can avoid using an interference fit to achieve a seal; that is, sealing can be achieved by pressing the sealing lip in the radial direction. Therefore, the outer diameter of the small-diameter portion can be set no larger than the minimum inner diameter of the sealing lip. This results in lower frictional resistance between the sealing lip and the valve block during the axial movement of the valve block relative to the sealing assembly, reducing wear on the sealing lip and extending the service life of the sealing assembly. It also reduces the valve-closing driving force and improves the valve-opening response speed.

[0014] In one feasible embodiment, 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, a sealing lip being formed in the seal, and an insertion hole being formed in the support.

[0015] In one feasible embodiment, the support includes a first support portion located above the seal and a second support portion located below the seal; the outer peripheral wall of the seal protrudes from the outer peripheral wall of the support; the outer peripheral wall of the seal is interference-fitted with the peripheral wall of the valve cavity of the valve seat.

[0016] In one feasible embodiment, the outer peripheral wall surface of the seal is a convex arc-shaped surface.

[0017] In one feasible embodiment, the insertion hole is formed in the second support portion, and the first support portion has a through hole, the diameter of which is larger than the maximum inner diameter of the sealing lip.

[0018] In one feasible embodiment, the second support portion includes a cylindrical portion extending axially upward and inserted into the seal, a portion of the insertion portion being formed in the cylindrical portion, and the sealing lip being located at the upper end of the cylindrical portion.

[0019] In one feasible embodiment, the sealing lip is further inclined axially toward the side where the first step surface is located.

[0020] In one feasible embodiment, the stiffness valve further includes a head component, the valve seat having an upward-facing second stepped surface that supports the sealing assembly, and the head component pressing against the upper end face of the sealing assembly.

[0021] In one feasible embodiment, the end cap component includes a connecting portion and an end cap, the end cap including a main body and an extension extending downward from the lower end of the main body, the connection between the extension and the main body forming a downward stepped surface, the extension being fixedly inserted into the inner hole of the connecting portion, the stepped surface abutting against the upper end face of the connecting portion, and the lower end face of the connecting portion abutting against the upper end face of the sealing assembly.

[0022] In one feasible embodiment, the connecting portion and the sealing head are welded and fixed; the inner hole of the connecting portion has a downward-facing third stepped surface, and there is an axial gap between the third 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

[0023] Figure 1 This is a cross-sectional schematic diagram of the stiffness valve in the open state in one embodiment of this application;

[0024] Figure 2 This is a cross-sectional schematic diagram of the stiffness valve in the closed state in one embodiment of this application;

[0025] Figure 3 for Figure 1 A magnified view of part A in the middle;

[0026] Figure 4 for Figure 3 A magnified view of part A1 in the middle;

[0027] Figure 5 for Figure 4 A magnified view of a portion of area A11 in the middle;

[0028] Figure 6 for Figure 2 A magnified view of part B in the middle;

[0029] Figure 7 for Figure 4 A magnified view of a portion of the B1 area;

[0030] Figure 8 for Figure 7 A magnified view of a portion of the B11 area;

[0031] Figure 9 This is a cross-sectional schematic diagram of the sealing assembly in a specific embodiment.

[0032] Explanation of reference numerals in the attached figures:

[0033] Valve seat 10, valve port 11, valve cavity 12, second step surface 121, cavity peripheral wall surface 122, second interface 13;

[0034] End cap component 20, end cap head 21, main body 211, extension 212, stepped surface 213, connecting part 22, third stepped surface 222;

[0035] Valve block 31, large diameter portion 311, small diameter portion 312, first stepped surface 313, sealing element 32, buffer 33;

[0036] Sealing assembly 40, insertion hole 401, support member 41, first support portion 411, through hole 4111, second support portion 412, cylindrical portion 4121, fourth stepped surface 4122, sealing member 42, sealing lip 421, sealing protrusion 422.

[0037] 61. Mandrel 62. Core iron 63. Coil 64. Sleeve 65. Magnetic housing 65. End cap 66. Terminal block 67. Elastic element 68. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Please refer to Figure 1 and Figure 2 , Figure 1 This is a cross-sectional schematic diagram of the stiffness valve in the open state in one embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of the stiffness valve in the closed state in one embodiment of this application.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 component 20, it can directly contact the end cap component 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, rubber.

[0050] To prevent internal leakage, a sealing-related structure needs to be provided between the outer peripheral walls of the end cap component 20, valve seat 10, and valve block 31 to ensure sealing performance.

[0051] In this embodiment, the stiffness valve also includes a sealing assembly 40, which is axially connected to the valve seat 10. A valve block 31 is inserted into the sealing assembly 40, and the valve block 31 can move axially relative to the sealing assembly 40 to close or open the valve port 11.

[0052] Please refer to this as well. Figures 3 to 8 , Figure 3 for Figure 1 A magnified view of part A in the middle; Figure 4 for Figure 3 A magnified view of part A1 in the middle; Figure 5 for Figure 4 A magnified view of a portion of area A11 in the middle; Figure 6 for Figure 2 A magnified view of part B in the middle; Figure 7 for Figure 4 A magnified view of a portion of the B1 area; Figure 8 for Figure 7 A magnified view of part B11 in the middle.

[0053] In this embodiment, the valve block 31 includes a large diameter portion 311 and a small diameter portion 312. The large diameter portion 311 is located above the small diameter portion 312, and the connection between the large diameter portion 311 and the small diameter portion 312 forms a downward-facing (towards the valve port portion 11) first stepped surface 313.

[0054] The sealing assembly 40 has an insertion portion 401 that guides and mates with the small-diameter portion 312 of the valve block 31. The sealing assembly 40 is provided with a sealing lip 421 in an annular structure, which protrudes from the hole wall of the insertion portion 401. In other words, the sealing lip 421 is located in the inner ring of the sealing assembly 40 near the valve block 31.

[0055] The outer diameter of the small diameter portion 312 of the valve block 31 is not greater than the minimum inner diameter of the sealing lip 421, and the outer diameter of the large diameter portion 311 of the valve block 31 is greater than the minimum inner diameter of the sealing lip 421.

[0056] The sealing lip 421 of the valve block 31 and the sealing assembly 40 is configured such that when the valve block 31 is closed at the valve port 11, the sealing lip 421 is deformed under the pressure of the first step surface 313 of the valve block 31 to form a seal between the first step surface 313 and the outer peripheral wall surface of the small diameter portion 312.

[0057] The connection end between the sealing lip 421 and the sealing assembly 40 is defined as the root, and the end of the sealing lip 421 near the valve block 31 is defined as the head. It can be understood that the head side of the sealing lip 421 is in a suspended state. As the first step surface 313 moves downward along the axial direction with the valve block 31, the first step surface 313 contacts and presses against the head side of the sealing lip 421, and the sealing lip 421 is easily deformed to achieve sealing.

[0058] With the above structure, when the valve block 31 closes the valve port 11 axially downward relative to the sealing assembly 40, the first step surface 313 of the valve block 31 moves downward and can contact the sealing lip 421. When the first step surface 313 just contacts the sealing lip 421, the valve port 11 is still not completely closed. The valve block 31 needs to continue to move downward to close the valve port 11. During the continued downward movement, since the axial position of the sealing assembly 40 remains unchanged, the first step surface 313 will squeeze the sealing lip 421, causing the sealing lip 421 to deform and fit and seal against the first step surface 313 and the outer peripheral wall of the small diameter portion 312. With this configuration, the small-diameter portion 312 of the valve block 31 and the sealing lip 421 can avoid using an interference fit to achieve a seal. In other words, it can avoid achieving a seal by squeezing the sealing lip 421 in the radial direction. Therefore, the outer diameter of the small-diameter portion 312 can be set no larger than the minimum inner diameter of the sealing lip 421. In this way, during the axial movement of the valve block 31 relative to the sealing assembly 40, the frictional resistance between the sealing lip 421 and the valve block 31 is small, resulting in less wear on the sealing lip 421. This helps to extend the service life of the sealing assembly 40 and reduces the valve closing driving force, which helps to improve the valve opening response speed.

[0059] In addition, in the above solution, the sealing component 40 only needs to be provided with a sealing lip 421. Combined with the setting of the first step surface 313 of the valve block 31, the sealing can be guaranteed. When the valve is closed, the sealing lip 421 can be sealed with the first step surface 313 and the outer peripheral wall of the small diameter part 312 when the pressure above or below the sealing lip is large, and the probability of internal leakage is low.

[0060] In this embodiment, the sealing lip 421 of the sealing assembly 40 is also inclined axially toward the side where the first step surface 313 is located. In other words, the head of the sealing lip 421 is higher than its root in the axial direction. With this configuration, when the valve block 31 moves downward, the first step surface 313 can easily press the head of the sealing lip 421 toward the outer peripheral wall of the small diameter portion 312, thereby easily forming a seal between the pressed sealing lip 421 and the outer peripheral wall of the small diameter portion 312.

[0061] Please refer to this as well. Figure 9 , Figure 9 This is a cross-sectional schematic diagram of the sealing assembly in a specific embodiment.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In one implementation, the support member 41 includes a first support portion 411 located above the seal member 42 and a second support portion 412 located below the seal member 42. In this way, the seal member 42 is effectively sandwiched between the first support portion 411 and the second support portion 412, easily ensuring the overall shape of the seal member 42.

[0066] The outer peripheral wall of the seal 42 protrudes beyond the outer peripheral wall of the support 41. That is, the seal 42 has a sealing protrusion 422 protruding from the outer peripheral wall of the support 41. This sealing protrusion 422, or the outer peripheral wall of the seal 42, is interference-fitted with the periphery wall 122 of the valve cavity 12 of the valve seat 10. It is understood that at least a portion of the sealing assembly 40 is located within the valve cavity 12 of the valve seat 10, so that the sealing protrusion 422 of the seal 42 can form a seal with the valve cavity 12 of the valve seat 10.

[0067] In a specific implementation, the outer peripheral wall of the sealing protrusion 422 is a convex arc-shaped surface, which facilitates radial compression of the sealing protrusion 422 during the assembly of the sealing assembly 40 and the valve seat 10, thereby ensuring a sealing effect between the sealing assembly 40 and the valve seat 10. 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.

[0068] In a specific implementation, the insertion portion 401 of the sealing assembly 40 is formed in the second support portion 412, and the first support portion 411 has a through hole 4111. The diameter of the through hole 4111 is larger than the maximum inner diameter of the sealing lip 421. This ensures that the first support portion 411 will not obstruct or compress the sealing lip 421. Specifically, in the radial direction, the sealing lip 421 can be completely located inside the wall of the through hole 4111, or the head side of the sealing lip 421 can be located inside the wall of the through hole 4111, so as not to affect the compressive deformation effect of the first step surface 313 on the sealing lip 421.

[0069] In a specific implementation, the second support portion 412 includes a cylindrical portion 4121 that extends axially upward and is inserted into the seal 42. A portion of the insertion hole portion 401 is formed in the cylindrical portion 4121, meaning that the inner wall surface of the cylindrical portion 4121 is part of the hole wall of the insertion hole portion 401. The sealing lip 421 is located at the top or upper end of the cylindrical portion 4121 to avoid affecting the fit between the sealing lip 421 and the first stepped surface 313.

[0070] In this embodiment, the valve cavity 12 of the valve seat 10 has an upward-facing second stepped surface 121, which is used to support the sealing assembly 40. In this way, the sealing protrusion 422 of the sealing assembly 40 is specifically sealed by interference fit with the cavity peripheral wall surface 122 of the valve cavity 12 located above the second stepped surface 121.

[0071] In a specific implementation, the second support portion 412 of the sealing assembly 40 also has a downward-facing fourth step surface 4122, which abuts against the second step surface 121 of the valve seat 10. That is, the second support portion 412 of the support member 42 also includes a portion located below the second step surface 121. In this way, the axial length of the insertion hole portion 401 of the sealing assembly 40 can be increased, 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.

[0072] The upper end face of the sealing assembly 40 can be pressed against by the end cap component 20. The axial positioning of the sealing assembly 40 is achieved through the cooperation of the end cap component 20 and the valve seat 10, while also achieving a seal between the end cap component 20 and the valve seat 10. It can be understood that the seal between the valve seat 10 and the end cap component 20 is achieved through the cooperation of the sealing protrusion 422 of the sealing assembly 40 with the valve seat 10.

[0073] In a specific implementation, the upper end face of the sealing component 40 can be flush with the upper end face of the valve seat 10, and the lower end face of the end cap component 20 presses against the upper end face of the sealing component 40 and the upper end face of the valve seat 10, which can ensure the stability and reliability of the fit between the end cap component 20 and the valve seat 10.

[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 third step surface 222. The third 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, It includes a valve seat, a valve block, and a sealing assembly; the sealing assembly is axially connected to the valve seat, the valve block is inserted into the sealing assembly, and the valve block is axially movable relative to the sealing assembly to close or open the valve port of the valve seat; The valve block includes a large-diameter portion and a small-diameter portion, the large-diameter portion being located above the small-diameter portion, and the connection between the large-diameter portion and the small-diameter portion forming a downward-facing first stepped surface; The sealing assembly has an insertion hole portion that guides and mates with the small diameter portion, and the sealing assembly is provided with a sealing lip in an annular structure, the sealing lip protruding from the hole wall surface of the insertion hole portion; The outer diameter of the small diameter portion is not greater than the minimum inner diameter of the sealing lip, and the outer diameter of the large diameter portion is greater than the minimum inner diameter of the sealing lip. When the valve block closes the valve port, the sealing lip deforms under the compression of the first step surface to form a seal between the first step surface and the outer peripheral wall of the small diameter portion.

2. The stiffness valve according to claim 1, 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 is formed in the seal, and the insertion hole is formed in the support.

3. The stiffness valve according to claim 2, characterized in that, The support includes a first support portion located above the seal and a second support portion located below the seal; the outer peripheral wall of the seal protrudes from the outer peripheral wall of the support; the outer peripheral wall of the seal is interference-fitted with the peripheral wall of the valve cavity of the valve seat.

4. The stiffness valve according to claim 3, characterized in that, The outer peripheral wall of the seal is a convex arc-shaped surface.

5. The stiffness valve according to claim 3, characterized in that, The insertion hole is formed in the second support portion, and the first support portion has a through hole, the diameter of which is larger than the maximum inner diameter of the sealing lip.

6. The stiffness valve according to claim 5, characterized in that, The second support portion includes a cylindrical portion that extends axially upward and is inserted into the seal, a portion of the insertion hole is formed in the cylindrical portion, and the sealing lip is located at the upper end of the cylindrical portion.

7. The stiffness valve according to any one of claims 1-6, characterized in that, The sealing lip is also inclined axially toward the side where the first step surface is located.

8. The stiffness valve according to any one of claims 1-6, characterized in that, The stiffness valve further includes a head component, the valve seat has an upward-facing second stepped surface in the valve cavity, the second stepped surface supports the sealing assembly, and the head component presses against the upper end surface of the sealing assembly.

9. The stiffness valve according to claim 8, 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.

10. The stiffness valve according to claim 9, 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 third step surface, and there is an axial gap between the third step surface and the upper end surface of the sealing assembly, and there is also an axial gap between the lower end surface of the extension and the upper end surface of the sealing assembly.

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