Rigidity valve

Abstract

The invention discloses a rigidity valve which comprises a valve seat, a valve block component and a guide sleeve. The guide sleeve and the valve seat are in limiting connection in the axial direction, the valve block component is inserted into the guide sleeve, and the valve block component can move in the axial direction relative to the guide sleeve so as to close or open a valve port part of the valve seat; the valve block component comprises a valve block and two sealing rings, the two sealing rings are arranged in the axial direction, the sealing rings are located between the valve block and the guide sleeve, and the sealing rings are fixedly connected with the valve block; the sealing ring is provided with a sealing lip, and the sealing lip is of an annular structure extending outwards from the peripheral face of the sealing ring. The inner hole part of the guide sleeve comprises a first inner hole section and a second inner hole section, and when the valve port part is closed by the valve block part, the first inner hole section and the second inner hole section are in sealing fit with the two sealing lips respectively. The sealing related component of the rigidity valve is simple in structure, low in requirement for size precision, capable of reducing machining difficulty and convenient to assemble.

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 state 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 state abutting against the valve port, a seal is formed between the sealing block and the sealing structure.

[0006] To achieve a seal between the end cap and the valve seat, the sealing structure also needs to cooperate with the outer circumferential surface of the sealing block to achieve a seal when the valve is open and a seal when the valve is closed. The structure is complex and the dimensional accuracy requirements are high, resulting in high processing difficulty and high processing cost. Summary of the Invention

[0007] The purpose of this application is to provide a stiffness valve, wherein the sealing-related components of the stiffness valve have a simple structure, low dimensional accuracy requirements, and can reduce the difficulty of processing and facilitate assembly.

[0008] To solve the above-mentioned technical problems, this application provides a stiffness valve, including a valve seat, a valve block component and a guide sleeve; the guide sleeve is axially connected to the valve seat, the valve block component is inserted into the guide sleeve, and the valve block component can move axially relative to the guide sleeve to close or open the valve port of the valve seat;

[0009] The valve block component includes a valve block and two sealing rings. The two sealing rings are arranged axially and are located between the valve block and the guide sleeve. The sealing rings are fixedly connected to the valve block. The sealing rings are provided with sealing lips, which are annular structures extending outward from the outer circumference of the sealing ring.

[0010] The inner bore of the guide sleeve includes a first inner bore section and a second inner bore section. When the valve block component closes the valve port, the first inner bore section and the second inner bore section respectively seal with the two sealing lips.

[0011] With the above structure, a sliding seal can be achieved between the valve block component and the guide sleeve. The two sealing rings are two separate components, mounted on the valve block of the valve block component. Each sealing ring has a sealing lip that mates with a bore section of the guide sleeve. Since the two sealing lips are not located on a single component, the machining accuracy requirements for the sealing rings are reduced. Simultaneously, the sealing mating of the two sealing lips with the first and second inner bore sections of the guide sleeve, respectively, can be ensured by the installation position of the sealing rings on the valve block, the axial length of the first inner bore section, and the axial length of the second inner bore section, thus lowering the dimensional accuracy requirements for the relevant components. In summary, the structure enabling a sliding seal between the valve block component and the guide sleeve is relatively simple, facilitates dimensional accuracy control, reduces the machining difficulty of the sealing-related structures, and also facilitates assembly.

[0012] In one possible implementation, the sealing lip is further inclined to one axial side to give it the ability to deform to the other axial side; the sealing lips of the two sealing rings are inclined in opposite directions in the axial direction.

[0013] The diameters of both the first inner hole section and the second inner hole section are smaller than the maximum outer diameter of the corresponding sealing lip.

[0014] In one possible implementation, the two sealing rings are a first sealing ring and a second sealing ring, with the first sealing ring being farther away from the valve port relative to the second sealing ring; the sealing lip of the first sealing ring is inclined upward in the axial direction, and the sealing lip of the second sealing ring is inclined downward in the axial direction.

[0015] In one possible implementation, the first inner hole section and the second inner hole section have the same diameter, and the two sealing rings have the same structure.

[0016] In one possible implementation, the sealing lip includes a root portion connected to the outer peripheral surface of the sealing ring and a head portion away from the outer peripheral surface of the sealing ring, wherein the thickness of the sealing lip decreases from the root portion to the head portion.

[0017] In one possible implementation, the inner bore of the guide sleeve further includes a third inner bore section and a fourth inner bore section. The first inner bore section is located away from the valve port relative to the second inner bore section. The third inner bore section is located on the side of the first inner bore section away from the valve port. The fourth inner bore section is located between the first inner bore section and the second inner bore section. The diameters of both the third and fourth inner bore sections are not less than the maximum outer diameter of the corresponding sealing lip.

[0018] In one possible implementation, the third inner hole segment and the first inner hole segment are connected by a first transition hole segment, wherein the diameter of the first transition hole segment gradually decreases from the third inner hole segment to the first inner hole segment.

[0019] And / or,

[0020] The fourth inner hole section and the second inner hole section are connected by a second transition hole section, the diameter of which gradually decreases from the fourth inner hole section to the second inner hole section.

[0021] In one possible implementation, the stiffness valve further includes a head component and a sealing gasket; the valve seat has a valve cavity with an upward-facing first stepped surface, the guide sleeve presses the sealing gasket against the first stepped surface, and the lower end face of the head component presses against the upper end face of the guide sleeve.

[0022] In one possible implementation, the guide sleeve includes a large-diameter sleeve portion and a small-diameter sleeve portion, the small-diameter sleeve portion being connected to the lower end of the large-diameter sleeve portion, the sealing gasket being sleeved on the small-diameter sleeve portion, and the sealing gasket being located between the large-diameter sleeve portion and the first stepped surface.

[0023] In one possible implementation, the end cap component includes a connecting portion and an end cap head. The end cap 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 guide sleeve.

[0024] 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 guide sleeve, and there is also an axial gap between the lower end face of the extension and the upper end face of the guide sleeve. Attached Figure Description

[0025] Figure 1 This is a cross-sectional schematic diagram of the stiffness valve in the open state in one embodiment of this application;

[0026] Figure 2 This is a cross-sectional schematic diagram of the stiffness valve in the closed state in one embodiment of this application;

[0027] Figure 3 This is a cross-sectional schematic diagram of the valve block component in a specific embodiment;

[0028] Figure 4 for Figure 3 Enlarged view of the two sealing rings in the middle;

[0029] Figure 5 This is a cross-sectional schematic diagram of the fit between the guide sleeve and the sealing gasket in a specific embodiment;

[0030] Figure 6 for Figure 1 A magnified view of part A in the middle;

[0031] Figure 7 for Figure 6 A magnified view of part A1 in the middle;

[0032] Figure 8 for Figure 7 A magnified view of a portion of area A11 in the middle;

[0033] Figure 9 for Figure 7 A magnified view of a portion of area A12 in the middle;

[0034] Figure 10 for Figure 2 A magnified view of part B in the middle;

[0035] Figure 11 for Figure 10 A magnified view of a portion of the B1 area;

[0036] Figure 12 for Figure 11 A magnified view of a portion of the B11 area;

[0037] Figure 13 for Figure 11 A magnified view of part B12 in the middle.

[0038] Explanation of reference numerals in the attached figures:

[0039] Valve seat 10, valve port 11, valve cavity 12, first stepped surface 121, cavity peripheral wall surface 122, second interface 13;

[0040] End cap component 20, end cap head 21, main body 211, extension 212, stepped surface 213, connecting part 22, second stepped surface 222.

[0041] Valve block component 30, valve block 31, annular groove 311, sealing element 32, buffer 33, first sealing ring 34a, first sealing lip 341a, second sealing ring 34b, second sealing lip 341b;

[0042] Guide sleeve 40, small diameter sleeve 401, large diameter sleeve 402, first inner hole section 411, second inner hole section 412, third inner hole section 413, fourth inner hole section 414, first transition hole section 415, second transition hole section 416.

[0043] Sealing gasket 50;

[0044] 61. Mandrel 62. Core iron 63. Coil 64. Sleeve 65. Magnetic housing 65. End cap 66. Terminal block 67. Elastic element 68. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In this embodiment, the stiffness valve includes a valve seat 10, a head component 20, a valve block component 30, 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.

[0050] 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 assembly 30. 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 assembly 30 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.

[0051] 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.

[0052] 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 component 30 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 component 30 to move axially upward (away from the valve port 11) via the spindle 61 to open the valve port 11.

[0053] 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 stiffness spring can be in a connected or non-connected state by opening or closing the stiffness valve.

[0054] The end cap component 20 has an end cap cavity communicating with the valve cavity 12 of the valve seat 10. The valve block component 30 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 component 30.

[0055] To prevent internal leakage, a sealing-related structure needs to be provided between the outer peripheral walls of the end cap component 20, the valve seat 10, and the valve block component 30 to ensure sealing performance.

[0056] In this embodiment, the stiffness valve also includes a guide sleeve 40, which is axially connected to the valve seat 10. The valve block component 30 is inserted into the guide sleeve 40, and the valve block component 30 can move axially relative to the guide sleeve 40 to close or open the valve port 11.

[0057] Please refer to this as well. Figure 3 and Figure 4 , Figure 3 This is a cross-sectional schematic diagram of the valve block component in a specific embodiment; Figure 4 for Figure 3 A magnified view of the two sealing rings.

[0058] In this embodiment, the valve block component 30 includes a valve block 31 and two sealing rings. The two sealing rings are arranged axially and are located between the valve block 31 and the guide sleeve 40. The sealing rings are fixedly connected to the valve block 31. The sealing rings are provided with sealing lips, which are annular structures extending outward from the outer circumference of the sealing ring.

[0059] For ease of description, the two sealing rings are referred to here as the first sealing ring 34a and the second sealing ring 34b. The first sealing ring 34a has a first sealing lip 341a, and the second sealing ring 34b has a second sealing lip 341b. The first sealing ring 34a and the second sealing ring 34b are axially spaced apart, and this distance is related to the hole structure of the guide sleeve 40 mentioned later.

[0060] In this embodiment, the outer peripheral wall of the valve block 31 is provided with two annular grooves 311, and two sealing rings are respectively embedded in the two annular grooves 311. For example, the sealing rings can be installed in the annular grooves 311 by interference fit to achieve fixation with the valve block 31.

[0061] After the sealing ring is installed in the annular groove 311 of the valve block 31, the sealing lip of the sealing ring protrudes from the outer peripheral wall of the valve block 31. In actual installation, the outer peripheral wall of the main body of the sealing ring (excluding the sealing lip) can be flush with the outer peripheral wall of the valve block 31, or it can protrude slightly from the outer peripheral wall of the valve block 31.

[0062] In one feasible embodiment, the valve block component 30 may further include a sealing element 32 fixed to the bottom of the valve block 31. This 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.

[0063] In one feasible embodiment, the valve block component 30 may further include a buffer member 33 fixed to the top of the valve block 31. When the valve block component 30 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 using the buffer member 33 for cushioning to reduce wear on the valve block component 30 and reduce noise. The buffer member 33 may be made of an elastic material; for example, the elastic material may be rubber or the like.

[0064] Please refer to this as well. Figures 5 to 13 , Figure 5 This is a cross-sectional schematic diagram showing the fit between the guide sleeve and the sealing gasket in a specific embodiment. Figure 6 for Figure 1 A magnified view of part A in the middle. Figure 7 for Figure 6 A magnified view of a portion A1 in the middle. Figure 8 and Figure 9 They are respectively Figure 7 Enlarged views of parts A11 and A12 in the middle. Figure 10 for Figure 2 A magnified view of part B in the middle. Figure 11 for Figure 10 A magnified view of a portion of the B1 area. Figure 12 and Figure 13 They are respectively Figure 11 Enlarged view of parts B11 and B12.

[0065] In this embodiment, the inner bore of the guide sleeve 40 includes a first inner bore section 411 and a second inner bore section 412. When the valve block component 30 is in the closed valve port 11 state, the two sealing lips of the valve block component 30 are respectively sealed and engaged with the first inner bore section 411 and the second inner bore section 412.

[0066] The sealing lip includes a root portion that connects to the outer circumferential surface of the sealing ring and a head portion that is away from the outer circumferential surface of the sealing ring. The head portion of the sealing lip can be considered to be suspended in the air. The sealing lip has a certain elastic deformation capacity and must achieve a sealing fit with the first inner bore section 411 and the second inner bore section 412 in the closed valve state (i.e., when the valve block component 30 is closed at the valve port 11). The sealing lips of the two sealing rings need to be interference-fitted with the first inner bore section 411 and the second inner bore section 412, respectively.

[0067] In the illustrated scheme, the first inner bore section 411 is located above the second inner bore section 412. The first inner bore section 411 is relatively far away from the valve port 11, while the second inner bore section 412 is relatively close to the valve port 11. The first sealing ring 34a is located above the second sealing ring 34b. Therefore, in the closed state, the first sealing lip 341a of the first sealing ring 34a is in sealing engagement with the first inner bore section 411, and the second sealing lip 341b of the second sealing ring 34b is in sealing engagement with the second inner bore section 412. (See reference...) Figures 10 to 13understand.

[0068] Specifically, the diameter of the first inner hole section 411 is smaller than the maximum outer diameter of the first sealing lip 341a, and the diameter of the second inner hole section 412 is smaller than the maximum outer diameter of the second sealing lip 341b.

[0069] In one feasible solution, the diameters of the first inner hole section 411 and the second inner hole section 412 are the same, which facilitates the machining of the guide sleeve 40 and provides a basis for the two sealing rings to adopt the same structure. Specifically, the first sealing ring 34a and the second sealing ring 34b can adopt the same structure. Here, the same structure means that the two are identical in composition, shape, and size. In this way, the two sealing rings can be produced using the same mold, which can reduce mold costs.

[0070] The axial spacing between the two sealing rings is related to the position of their respective sealing lips and the positions of the first inner hole section 411 and the second inner hole section 412. As long as it is ensured that the sealing lips of the two sealing rings are respectively located in the first inner hole section 411 and the second inner hole section 412 when the valve is closed, it is sufficient.

[0071] With the above structure, a sliding seal can be achieved between the valve block component 30 and the guide sleeve 40. The two sealing rings are two separate components, each with a sealing lip that mates with a bore in the guide sleeve 40. Since the two sealing lips are not located on a single component, the machining accuracy requirements for the sealing rings are reduced. Simultaneously, the sealing mating of the two sealing lips with the first inner bore section 411 and the second inner bore section 412, respectively, is ensured by the installation position of the sealing rings on the valve block 31, the axial length of the first inner bore section 411, and the axial length of the second inner bore section 412. The dimensional correlation between the two sealing parts is not strong, resulting in lower requirements for the dimensional machining accuracy of related components. In summary, the structure enabling a sliding seal between the valve block component 30 and the guide sleeve 40 is relatively simple, facilitates dimensional accuracy control, reduces the machining difficulty of sealing-related structures, and also facilitates assembly.

[0072] In this embodiment, the inner bore of the guide sleeve 40 further includes a third inner bore section 413 and a fourth inner bore section 414. The third inner bore section 413 is located on the side of the first inner bore section 411 away from the valve port 11, and the fourth inner bore section 414 is located between the first inner bore section 411 and the second inner bore section 412. Thus, the inner bore of the guide sleeve 40, from top to bottom (i.e., towards the valve port 11), consists of the third inner bore section 413, the first inner bore section 411, the fourth inner bore section 414, and the second inner bore section 412. In the open valve state, the third inner bore section 413 and the fourth inner bore section 414 respectively cooperate with the sealing lips of the corresponding sealing rings. For example, in the illustrated scheme, the first sealing lip 341a of the first sealing ring 34a cooperates with the third inner bore section 413, and the second sealing lip 341b of the second sealing ring 34b cooperates with the fourth inner bore section 414. (See reference...) Figures 6 to 9 Understood. At this time, because the valve port 11 is in the open state, the third inner bore section 413 and the first sealing lip 341a, and the fourth inner bore section 414 and the second sealing lip 341b, can be in a non-sealing state. In actual installation, the diameter of the third inner bore section 413 and the diameter of the fourth inner bore section 414 are not less than the maximum outer diameter of the sealing lip of the corresponding sealing ring.

[0073] During the movement of the valve block component 30 from the closed position to the open position, that is, during the axial upward movement of the valve block component 30 from the closed position, the second sealing lip 341b of the second sealing ring 34b will pass through the second inner hole section 412 and then engage with the fourth inner hole section 414, and the first sealing lip 341a of the first sealing ring 34a will pass through the first inner hole section 411 and engage with the third inner hole section 413. When the first sealing lip 341a engages with the third inner hole section 413 and the second sealing lip 341b engages with the fourth inner hole section 414, the valve block component 30 is in the open state with the valve port 11 open.

[0074] Because the diameter of the third inner section 413 is not less than the maximum outer diameter of the first sealing lip 341a, and the diameter of the fourth inner section 414 is not less than the maximum outer diameter of the second sealing lip 341b, the friction between the first sealing lip 341a, the second sealing lip 341b and the guide sleeve 40 can be reduced during the upward movement of the valve block component 30 relative to the guide sleeve 40 after the valve is opened. Only in the initial stage of valve opening or the later stage of valve closing, the first sealing lip 341a and the second sealing lip 341b respectively achieve sealing by interference fit with the first inner section 411 and the second inner section 412. In this way, during the opening and closing process of the valve block component 30, there is a period of low friction between the sealing lips of the two sealing rings and the guide sleeve 40, which can effectively reduce the wear of the sealing lips of the two sealing rings, ensure the sealing effect, and extend the service life of the sealing rings.

[0075] In one feasible solution, the diameter of the third inner hole section 413 is the same as the diameter of the fourth inner hole section 414 to facilitate the machining of the guide sleeve 40.

[0076] It is understandable that the diameters of the third inner hole section 413 and the fourth inner hole section 414 are larger than the diameters of the first inner hole section 411 and the second inner hole section 412.

[0077] In one feasible solution, the inner bore of the guide sleeve 40 further includes a first transition bore section 415 disposed between the third inner bore section 413 and the first inner bore section 411, such as... Figure 8 and Figure 12As shown, the diameter of the first transition hole section 415 gradually decreases from the third inner hole section 413 to the first inner hole section 411. Thus, when the valve block component 30 moves axially, the first sealing lip 341a can slide between the first inner hole section 411 and the third inner hole section 413 through the transition of the first transition hole section 415. The friction between the first sealing lip 341a and the guide sleeve 40 changes gradually, which can reduce the impact on the first sealing lip 341a during movement and help reduce the wear of the first sealing lip 341a.

[0078] In one feasible solution, the inner bore of the guide sleeve 40 further includes a second transition section 416 disposed between the fourth inner bore section 414 and the second inner bore section 412, such as... Figure 9 and Figure 13 As shown, the diameter of the second transition hole section 416 gradually decreases from the fourth inner hole section 414 to the second inner hole section 412. Thus, when the valve block component 30 moves axially, the second sealing lip 341b can slide between the second inner hole section 412 and the fourth inner hole section 414 through the transition of the second transition hole section 416. The friction between the second sealing lip 341b and the guide sleeve 40 changes gradually, which can reduce the impact on the second sealing lip 341b during movement and help reduce wear on the second sealing lip 341b.

[0079] In this embodiment, the sealing lip of the sealing ring is also inclined to one side of the axial direction so that the sealing lip has the ability to deform to the other side of the axial direction; the sealing lips of the two sealing rings are inclined in opposite directions in the axial direction, in other words, one of the two sealing lips is inclined to the upward side of the axial direction and the other is inclined to the downward side of the axial direction.

[0080] Combination Figures 10 to 13 In the closed state, there is a space between the outer periphery of the valve block component 30 and the guide sleeve 40 and end cap component 20, located above the first sealing lip 341a; and a space between the outer periphery of the valve block component 30 and the guide sleeve 40 and valve seat 10, located below the second sealing lip 341b. 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 corresponding orifice of the guide sleeve 40, 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 corresponding orifice of the guide sleeve 40, leading to seal failure and also increasing the risk of internal leakage.

[0081] After the two sealing lips of the two sealing rings are set as described above, in the closed state, the sealing lips themselves are inclined to one side axially, and in this state, they maintain a sealing fit with the guide sleeve 40. The two sealing lips are inclined in opposite directions. In this way, when the pressure in the upper space region is high and applies downward pressure to the sealing lips, the sealing lip inclined upward axially deforms downward under the action of this pressure, which increases the maximum outer diameter of the sealing lip, thereby ensuring the sealing state between it and the corresponding hole section of the guide sleeve 40, and ensuring the sealing effect. Similarly, when the pressure in the lower space region is high and applies upward pressure to the sealing lips, the sealing lip inclined downward axially deforms upward under the action of this pressure, which increases the maximum outer diameter of the sealing lip, thereby ensuring the sealing state between it and the corresponding hole section of the guide sleeve 40, and ensuring the sealing effect.

[0082] In specific implementation, the first sealing lip 341a of the upper first sealing ring 34a (the sealing ring away from the valve port 11) is inclined upward along the axial direction, and the second sealing lip 341b of the lower second sealing ring 34b (the sealing ring close to the valve port 11) is inclined downward along the axial direction. Figure 4 As shown.

[0083] Here, axial tilting to one side can be defined as the head of the sealing lip (the side away from the sealing ring) being axially higher or lower than the root of the sealing lip (the side connected to the sealing ring). If the head of the sealing lip is higher than its root, the sealing lip is considered to be axially tilted upwards; if the head of the sealing lip is lower than its root, the sealing lip is considered to be axially tilted downwards.

[0084] like Figures 10 to 13When the pressure in the space above the first sealing lip 341a is too high in the closed valve state, a downward force is applied to the first sealing lip 341a, causing it to deform downwards. Since the first sealing lip 341a in the inclined state maintains a sealing fit with the first inner hole section 411, after the first sealing lip 341a deforms downwards, it deforms from the inclined state to the flat state. The maximum outer diameter after deformation is still larger than the diameter of the first inner hole section 411, and it can still maintain a sealing fit with the first inner hole section 411. At the same time, the second sealing lip 341b is unaffected and maintains a sealing fit with the second inner hole section 412. Both sealing lips and the guide sleeve 40 maintain a sealing fit, 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 341b is too high, an upward force is applied to the second sealing lip 341b, causing it to deform upward. Since the second sealing lip 341b in the inclined state maintains a sealing fit with the second inner bore section 412, after the second sealing lip 341b deforms upward, it changes from an inclined state to a flat state. The maximum outer diameter after deformation is still larger than the bore diameter of the second inner bore section 412, and it can still maintain a sealing fit with the second inner bore section 412. At the same time, the first sealing lip 341a remains unaffected and maintains a sealing fit with the first inner bore section 411. Both sealing lips and the guide sleeve 40 maintain a sealing fit, resulting in a good sealing effect when the valve is closed.

[0085] In practice, the thickness of the sealing lip decreases from its root to its head, which improves the strength of the connection between the sealing lip and the sealing ring and also facilitates the fit between the sealing lip and the guide sleeve 40.

[0086] 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 space is too high, the upper sealing lip may detach from the first inner hole section 411 under the downward pressure difference, causing the seal to fail. Only the lower sealing lip can then provide a seal. Similarly, when the pressure in the lower space 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.

[0087] In practice, the sealing lip of the sealing ring is positioned close to the axial end of the sealing ring. This facilitates control of the sealing lip's position, making it easier to determine the assembly position of the two sealing lips and the position and size of each hole segment of the guide sleeve 40 that mates with the sealing lip. This arrangement does not affect the fact that the two sealing rings can be manufactured using a single mold; simply arrange the two sealing rings back to back during assembly so that the inclination directions of the two sealing lips are opposite.

[0088] A seal is required between the end cap component 20 and the valve seat 10. In this embodiment, the rigidity valve also includes a sealing gasket 50. The end cap component 20 presses the sealing gasket 50 against the valve seat 10 through the guide sleeve 40 to achieve a seal between the end cap component 20 and the valve seat 10.

[0089] In one implementation, the valve cavity 11 of the valve seat 10 has an upward-facing first stepped surface 121 at its upper end near the end cap component 20, such as... Figure 6 and Figure 10 As shown, the guide sleeve 40 presses the sealing gasket 50 against the first step surface 121, and the lower end face of the end cap component 20 presses against the upper end face of the guide sleeve 40.

[0090] In practice, the upper end face of the guide sleeve 40 can be flush with the upper end face of the valve seat 10, and the lower end face of the end cap 20 presses against both the upper end face of the guide sleeve 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 20 and the valve seat 10.

[0091] In practice, the outer peripheral surface of the sealing gasket 50 is also in contact with the cavity peripheral wall 122 of the valve cavity 11 located above the first step surface 121, which can improve the sealing effect between the end cap component 20 and the valve seat 10.

[0092] In one implementation, the guide sleeve 40 includes a large-diameter sleeve portion 402 and a small-diameter sleeve portion 401. The small-diameter sleeve portion 401 is connected to the lower end of the large-diameter sleeve portion 402. A sealing gasket 50 is sleeved on the small-diameter sleeve portion 401 and is located between the large-diameter sleeve portion 402 and the first step surface 121.

[0093] In a specific implementation, the outer diameter of the large-diameter sleeve 402 can be consistent with the inner diameter of the cavity of the valve cavity 11 located above the first step surface 121, so as to improve the sealing effect between the end cap component 20 and the valve seat 10.

[0094] After the above settings are configured, a static seal is formed between the end cap component 20 and the valve seat 10. The sealing area is relatively large, which can ensure the sealing effect between the two.

[0095] 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 guide sleeve 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.

[0096] Specifically, the head 21 and the connecting part 22 can be set as separate structures and then fixedly connected, or the head 21 and the connecting part 22 can be integrally formed, that is, the head component 20 is an integrally formed component.

[0097] When the end cap 21 and the connecting portion 22 are separately provided, they can be fixedly connected by welding. Specifically, the extension 212 of the end cap 21 can be welded to the inner hole of the connecting portion 22. At this time, the inner hole wall of the connecting portion 22 can be provided with a downward-facing second stepped surface 222. The second stepped surface 222 has an axial gap with the upper end face of the guide sleeve 40, and the extension 212 of the end cap 21 also has an axial gap with the upper end face of the guide sleeve 40. In this way, there is space between the mating part of the connecting portion 22 and the extension 212 and the upper end face of the guide sleeve 40. This space can accommodate the weld seam that may be generated when the connecting portion 22 and the extension 212 are welded, and avoid the lower end face of the connecting portion 22 from not being able to fit with the lower end face of the guide sleeve 40 due to welding.

[0098] 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 component, and a guide sleeve; the guide sleeve is axially connected to the valve seat, the valve block component is inserted into the guide sleeve, and the valve block component can move axially relative to the guide sleeve to close or open the valve port of the valve seat; The valve block component includes a valve block and two sealing rings. The two sealing rings are arranged axially and are located between the valve block and the guide sleeve. The sealing rings are fixedly connected to the valve block. The sealing rings are provided with sealing lips, which are annular structures extending outward from the outer circumference of the sealing ring. The inner bore of the guide sleeve includes a first inner bore section and a second inner bore section. When the valve block component closes the valve port, the first inner bore section and the second inner bore section respectively seal with the two sealing lips.

2. The stiffness valve according to claim 1, characterized in that, The sealing lip is also inclined to one axial direction so that the sealing lip has the ability to deform to the other axial direction; the sealing lips of the two sealing rings are inclined in opposite directions in the axial direction; The diameters of both the first inner hole section and the second inner hole section are smaller than the maximum outer diameter of the corresponding sealing lip.

3. The stiffness valve according to claim 2, characterized in that, The two sealing rings are a first sealing ring and a second sealing ring, with the first sealing ring being farther away from the valve port relative to the second sealing ring; the sealing lip of the first sealing ring is inclined upward in the axial direction, and the sealing lip of the second sealing ring is inclined downward in the axial direction.

4. The stiffness valve according to claim 1, characterized in that, The first inner hole section and the second inner hole section have the same diameter, and the two sealing rings have the same structure.

5. The stiffness valve according to any one of claims 1-4, characterized in that, The sealing lip includes a root portion connected to the outer peripheral surface of the sealing ring and a head portion away from the outer peripheral surface of the sealing ring. The thickness of the sealing lip decreases from the root portion to the head portion.

6. The stiffness valve according to any one of claims 1-4, characterized in that, The inner bore of the guide sleeve further includes a third inner bore section and a fourth inner bore section. The first inner bore section is located away from the valve port relative to the second inner bore section. The third inner bore section is located on the side of the first inner bore section away from the valve port. The fourth inner bore section is located between the first inner bore section and the second inner bore section. The diameters of the third inner bore section and the fourth inner bore section are both not less than the maximum outer diameter of the corresponding sealing lip.

7. The stiffness valve according to claim 6, characterized in that, The third inner hole section and the first inner hole section are connected by a first transition hole section, and the diameter of the first transition hole section gradually decreases from the third inner hole section to the first inner hole section. And / or, The fourth inner hole section and the second inner hole section are connected by a second transition hole section, the diameter of which gradually decreases from the fourth inner hole section to the second inner hole section.

8. The stiffness valve according to any one of claims 1-4, characterized in that, The stiffness valve further includes a head component and a sealing gasket; the valve cavity of the valve seat has an upward-facing first stepped surface, the guide sleeve presses the sealing gasket against the first stepped surface, and the lower end face of the head component presses against the upper end face of the guide sleeve.

9. The stiffness valve according to claim 8, characterized in that, The guide sleeve includes a large-diameter sleeve portion and a small-diameter sleeve portion. The small-diameter sleeve portion is connected to the lower end of the large-diameter sleeve portion. The sealing gasket is sleeved on the small-diameter sleeve portion and is located between the large-diameter sleeve portion and the first stepped surface.

10. The stiffness valve according to claim 8, characterized in that, The end cap component includes a connecting portion and an end cap head. The end cap 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 guide sleeve.

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 guide sleeve, and there is also an axial gap between the lower end face of the extension and the upper end face of the guide sleeve.

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