Valve structure

Abstract

The utility model provides a valve structure which comprises a valve assembly, a valve core assembly, a first sealing structure and a second sealing structure. A circulation cavity is formed in the valve assembly. The valve core assembly is at least partially located in the circulation cavity. The first sealing structure and the second sealing structure are arranged on the periphery of the valve core assembly and are arranged at intervals in the axial direction of the valve core assembly. The periphery of the first sealing structure is in interference fit with the inner wall of the circulation cavity; the valve core assembly is connected with the valve assembly to generate axial force in the axial direction of the valve core assembly, and the axial force is used for pressing the second sealing structure and the inner wall of the circulation cavity. The first sealing structure and the second sealing structure jointly seal a gap between the circulation cavity and the valve core assembly. By arranging the first sealing structure and the second sealing structure, the sealing effect is ensured, the leakage problem caused by looseness or failure of a single sealing structure is avoided, and the stability of the valve structure in long-term work is further ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a valve core valve technical field, specifically, relate to a valve structure. BACKGROUND

[0002] At present, the valve with valve core structure usually seals by a single sealing ring sleeved outside the valve core, which is easy to fail in high and low temperature working environment, and thus causes leakage. SUMMARY

[0003] The utility model provides a valve structure to solve the problem that the valve core structure in prior art is easy to leak under the sealing mode of single sealing ring in high and low temperature working environment.

[0004] In order to solve the above problem, the utility model provides a valve structure, comprising: valve assembly, valve core assembly, first sealing structure and second sealing structure, the valve assembly has flow passage inside, the valve core assembly is at least partially located in the flow passage, the first sealing structure and the second sealing structure are respectively arranged on the outer periphery of the valve core assembly and are spaced apart along the axial direction of the valve core assembly, the outer periphery of the first sealing structure is in interference fit with the inner wall of the flow passage, the valve core assembly is connected with the valve assembly to generate axial force along the axial direction of the valve core assembly, and the axial force is used to press the second sealing structure and the inner wall of the flow passage, the first sealing structure and the second sealing structure jointly seal the gap between the flow passage and the valve core assembly.

[0005] Further, the valve core assembly comprises a connecting section and a matching section connected in sequence along the axial direction, the connecting section is connected and matched with the inner wall of the flow passage to generate the axial force, the matching section is provided with a limiting groove recessed inward from the outer surface, the first sealing structure comprises a sealing ring, a part of the sealing ring is arranged in the limiting groove and is limited and matched with the limiting groove, the limiting groove is an annular groove and is arranged around the circumference of the matching section.

[0006] Further, the connecting section has external threads, the inner wall of the flow passage has internal threads, and the external threads are matched with the internal threads, the inner diameter of the internal threads is A, the outer diameter of the sealing ring is B, and the maximum outer diameter of the matching section is C, A is greater than B, and B is greater than C.

[0007] Further, the second sealing structure comprises a sealing gasket, and the sealing gasket is arranged on the matching section, the outer periphery of the sealing gasket has a conical surface, the axial direction parallel to the matching section and pointing to the inside of the flow passage is the first direction, the inner diameter of the conical surface gradually decreases along the first direction, the inner wall of the flow passage is provided with a conical hole matched with the conical surface, and the conical hole is matched with the conical surface.

[0008] Further, the sealing gasket and / or the sealing ring are made of elastic material; the valve core assembly has an openable and closable air vent; the sealing gasket is located between the first sealing structure and the air vent; or, the first sealing structure is located between the sealing gasket and the air vent.

[0009] Further, the valve core assembly has an openable and closable air vent; the second sealing structure is a matching protrusion formed by outward protruding from the outer surface of the matching section, the matching protrusion is arranged along the circumference of the valve core assembly and is located between the first sealing structure and the air vent; the inner wall of the flow-through cavity has a limiting protrusion, the limiting protrusion is in abutting sealing cooperation with the matching protrusion and axially limits the valve core assembly.

[0010] Further, the outer periphery of the matching protrusion has a tapered arc surface; a direction parallel to the axial direction of the valve core assembly and pointing to the inside of the flow-through cavity is defined as a first direction, the outer diameter of the tapered arc surface gradually decreases along the first direction; the limiting protrusion has a sharp corner arranged along the circumference of the inner wall of the flow-through cavity, the sharp corner and the tapered arc surface abut to form an annular sealing line.

[0011] Further, the inner wall of the flow-through cavity has an internal thread, the inner diameter of the internal thread is A, the outer diameter of the first sealing structure is B, the maximum outer diameter of the matching protrusion is the outer diameter C of the valve core assembly, A is greater than B, and B is greater than C.

[0012] Further, the matching protrusion and the limiting protrusion are both made of metal material; and / or, the matching protrusion and the matching section are an integrally formed structure, and the limiting protrusion and the inner wall of the flow-through cavity are an integrally formed structure.

[0013] Further, the sealing ring is a plurality of, the limiting recess is a plurality of, the plurality of limiting recesses and the plurality of sealing rings are one-to-one corresponding, and the plurality of limiting recesses are arranged in the axial direction of the matching section.

[0014] The utility model discloses a technical scheme, the utility model provides a valve structure, comprising: valve subassembly, valve core subassembly, first sealing structure and second sealing structure, the valve subassembly has the flow through cavity inside, the valve core subassembly is located at least partly in the flow through cavity, and the first sealing structure and second sealing structure are arranged at the outer periphery of valve core subassembly respectively and are arranged along the axial direction interval of valve core subassembly, the outer periphery of first sealing structure and the inner wall of flow through cavity are shrink fit, and the valve core subassembly is connected with valve subassembly, produces the axial force along the axial direction of valve core subassembly, and the axial force is used for the inner wall of flow through cavity with second sealing structure and is pressed tightly, and the first sealing structure and second sealing structure seal the gap between flow through cavity and valve core subassembly together. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated herein in their entirety. The application will be described with reference to these accompanying drawings, of which:

[0016] Figure 1 Fig. 1 shows the internal structure schematic diagram of the valve structure provided by the embodiment one of the utility model;

[0017] Figure 2 Fig. 2 shows the partial enlarged schematic view of the A in Fig. 1; Figure 1

[0018] Figure 3 Fig. 3 shows the external structure schematic diagram of the valve core subassembly provided by the embodiment one of the utility model;

[0019] Figure 4 Fig. 4 shows the full section schematic view of the structure in Fig. 3; Figure 3

[0020] Figure 5 ​​An internal structure schematic view of the valve structure provided by the embodiment two of the utility model is shown.

[0021] Figure 6 An internal structure schematic view of the valve structure provided by the embodiment two of the utility model is shown. Figure 5 A partial enlarged schematic view at B in the middle;

[0022] Figure 7 An external structure schematic view of the valve core assembly provided by the embodiment two of the utility model is shown.

[0023] Figure 8 An internal structure schematic view of the valve structure provided by the embodiment two of the utility model is shown. Figure 7 A full section schematic view of the structure in the middle.

[0024] Among them, the above-mentioned drawing includes the following sign:

[0025] 10, valve assembly; 11, flow cavity; 12, limiting protrusion;

[0026] 20, valve core assembly; 21, connecting section; 22, matching section; 221, limiting recess; 23, air vent;

[0027] 30, first sealing structure; 31, sealing ring;

[0028] 40, second sealing structure; 41, sealing washer; 411, conical ring surface; 42, matching protrusion; 421, conical arc surface. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.

[0030] As Figures 1 to 8The embodiment of the utility model provides a valve structure, include: valve subassembly 10, valve core subassembly 20, first sealing structure 30 and second sealing structure 40, valve subassembly 10 has the flow cavity 11 inside, valve core subassembly 20 at least partially is located in the flow cavity 11, valve core subassembly 20 has the openable and closable air vent 23, and the air vent 23 is used for the air intake or air outlet in the flow cavity 11, first sealing structure 30 and second sealing structure 40 are arranged respectively in the outer periphery of valve core subassembly 20, and along the axial spacing of valve core subassembly 20, the outer periphery of first sealing structure 30 and the inner wall interference fit of flow cavity 11, valve core subassembly 20 is connected with valve subassembly 10, produces the axial force along the axial of valve core subassembly 20, and the axial force is used for the second sealing structure 40 and the inner wall of flow cavity 11 is pressed tightly, first sealing structure 30 and second sealing structure 40 seal the gap between flow cavity 11 and valve core subassembly 20 together.

[0031] The utility model discloses a first sealing structure 30 and second sealing structure 40 are arranged on the valve core subassembly 20 and seal the gap between flow cavity 11 and valve core subassembly 20 together, guarantee the sealing effect, avoid the leakage problem because of single sealing structure loosening or failure, and then guarantee the stability of valve structure long -term work, the outer periphery of first sealing structure 30 and the inner wall interference fit of flow cavity 11, unlike the mode of conventional torque screw extrusion seal, the first sealing structure 30 in the utility model can realize sealing without relying on torque, and first sealing structure 30 only needs to contact the inner wall of flow cavity 11 and maintain certain pressure to carry out reliable sealing, and the torque of valve core subassembly 20 itself is not required, therefore can efficiently solve the leakage problem of valve core because of sealing ring loosening in actual use, the utility model structure is simple and low in cost, and the subsequent maintenance is convenient, can improve on the existing valve core structure, and the external size of valve core structure does not need to change in the improvement process, and the compatibility is good and will not affect normal use, is fit for large -scale popularization and use.

[0032] It should be noted that: in a specific embodiment of the utility model, the mode that valve core subassembly 20 is connected with valve subassembly 10 and produces the axial force along the axial of valve core subassembly 20 includes but is not limited to the mode of threaded connection, namely valve core subassembly 20 is connected with valve subassembly 10 by screwing the thread and produces the axial force.

[0033] As Figure 3 , Figure 4 , Figure 7 And Figure 8As shown, the valve core assembly 20 includes a connecting section 21 and a mating section 22 connected sequentially along the axial direction; the connecting section 21 is connected and mated with the inner wall of the flow cavity 11 to generate axial force; the mating section 22 is provided with a limiting groove 221 formed by recessing from the outer surface inward; the first sealing structure 30 includes a sealing ring 31, a part of which is disposed in the limiting groove 221 and is limited and mated with the limiting groove 221; the limiting groove 221 is an annular groove and is arranged around the circumference of the mating section 22.

[0034] The structural design of the connecting section 21 and mating section 22 of the valve core assembly 20, especially the mating groove 221 on the mating section 22 and the mating ring 31 in the first sealing structure 30, provides additional axial positioning and radial sealing functions. This design not only simplifies the installation process of the sealing ring 31, but also ensures the stability of the sealing ring 31 during use through the structure of the limiting groove 221, avoiding displacement of the sealing ring 31 due to pressure changes or vibration, thereby improving the tightness and durability of the seal.

[0035] In another specific embodiment of this utility model, the sealing ring 31 is an O-ring, so that the direction of the compressive force between the sealing ring 31 and the inner wall of the flow cavity 11 is perpendicular to the axial direction of the valve core assembly. This makes the sealing effect of the sealing ring 31 independent of the torque on the valve core, achieving a stable and reliable sealing effect with a simple structure, and effectively preventing gas leakage.

[0036] It is worth noting that in the valve structure proposed in this utility model, the force on the sealing ring 31 is mainly achieved through its interference fit with the inner wall of the flow cavity 11. That is, in its natural state, the outer diameter of the sealing ring 31 is slightly larger than the inner diameter of the inner wall of the flow cavity 11. When the valve core assembly 20 is assembled into the valve assembly 10, the sealing ring 31 is compressed, and its outer circumference is in close contact with the inner wall of the flow cavity 11, generating a radial elastic force. This force ensures a tight fit between the sealing ring 31 and the inner wall of the flow cavity 11, thereby achieving a seal without the need for additional tightening torque.

[0037] The beneficial effects of the above design are as follows: 1. Reduced dependence on torque: Unlike the traditional method of relying on torque to tighten the sealing ring 31, the sealing ring 31 of this invention achieves sealing through the radial elastic force generated by the interference fit, maintaining a good sealing effect even when the torque is insufficient or the valve core assembly 20 is loose; 2. Improved sealing stability: The interference fit design of the sealing ring 31 ensures that the sealing ring 31 can still maintain contact with the inner wall of the flow cavity 11 when the axial position of the valve core assembly 20 changes, avoiding sealing failure due to position changes; 3. Enhanced sealing reliability: Since the sealing effect of the sealing ring 31 does not completely depend on the tightening torque of the valve core assembly 20, it can better adapt to small dimensional changes between the valve assembly 10 and the valve core assembly 20. 4. Simplified maintenance and replacement process: The interference fit design of the sealing ring 31 makes it easier to install and replace, eliminating the need for complex torque control and reducing maintenance costs and time; 5. Improved compatibility and versatility: The external dimensions of the valve core assembly 20, especially the dimensions of the connecting section 21, can remain unchanged, making the valve structure of this invention compatible with existing standard valve core structures without modifying the external valve interface, thus improving versatility; 6. Reduced leakage risk: Since the sealing ring 31 can achieve sealing independently of the torque of the valve core assembly 20, it can maintain a good sealing state even under insufficient torque, thereby effectively reducing the risk of gas leakage.

[0038] Therefore, the sealing ring 31 design of this utility model not only reduces the stringent requirements for torque, but also provides a more stable, reliable, easy-to-maintain and more compatible sealing solution, which is suitable for use in high temperature, high pressure and high vibration working environments, and brings significant improvement and enhancement to the sealing performance of valve structures with valve cores.

[0039] like Figure 2 and Figure 6 As shown, the connecting section 21 has an external thread, the inner wall of the flow cavity 11 has an internal thread, and the external thread and the internal thread are matched; the inner diameter of the internal thread is A, the outer diameter of the sealing ring 31 is B, the maximum outer diameter of the mating section 22 is C, A is greater than B, and B is greater than C.

[0040] By setting the external thread on the connecting section 21, and having a matching internal thread on the inner wall of the flow cavity 11, an effective connection between the valve core assembly 20 and the valve assembly 10 is achieved. By setting the dimensional relationship between the inner diameter A, the outer diameter B of the sealing ring 31, and the maximum outer diameter C of the mating section 22, it is ensured that the sealing ring 31 can generate sufficient preload during installation, thereby achieving a seal without additional tightening torque, and the sealing ring 31 is prevented from being scratched by the internal thread during installation. At the same time, this design also reasonably limits the compression of the sealing ring 31 and considers the dimensional compatibility of the valve core assembly 20, avoiding adverse effects on the original valve structure due to unreasonable dimensional changes.

[0041] like Figure 2 , Figure 3 and Figure 4 As shown, in Embodiment 1 of this utility model, the second sealing structure 40 includes a sealing gasket 41, which is disposed on the mating section 22. The outer periphery of the sealing gasket 41 has a conical annular surface 411. Taking the direction parallel to the axial direction of the mating section 22 and pointing towards the inside of the flow cavity 11 as the first direction, the inner diameter of the conical annular surface 411 gradually decreases along the first direction. The inner wall of the flow cavity 11 has a conical hole for mating with the conical annular surface 411, and the conical hole is adapted to the conical annular surface 411.

[0042] By setting the sealing gasket 41 in the second sealing structure 40 to have a conical annular surface 411 that mates with a conical hole on the inner wall of the flow cavity 11, a self-tightening sealing structure is formed with a simple structure. This conical contact surface design allows the contact pressure between the sealing gasket 41 and the conical hole to gradually increase as the valve core assembly 20 is screwed into the flow cavity 11, thereby improving the tightness and stability of the seal. Even if the valve core assembly 20 becomes slightly loose, the conical annular surface 411 design can automatically adjust the contact pressure to maintain the sealing effect.

[0043] Specifically, the sealing gasket 41 and / or sealing ring 31 are made of elastic material; such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the sealing gasket 41 is located between the first sealing structure 30 and the vent 23; or, the first sealing structure 30 is located between the sealing gasket 41 and the vent 23.

[0044] By using elastic materials for the sealing gaskets 41 and 31, the valve assembly 10 and valve core assembly 20 can better adapt to minute dimensional changes, improving the adaptability and reliability of the sealing structure. This design ensures that the sealing gaskets 41 and 31 maintain good contact with the inner wall of the flow chamber 11 regardless of changes in the axial position of the valve core assembly 20, thus avoiding seal failure due to position changes. At the same time, the elastic material can absorb vibration, reducing loosening of the valve core assembly 20 caused by vibration, further enhancing the sealing effect.

[0045] In another specific embodiment of this utility model, the sealing gasket 41 and / or sealing ring 31 are made of highly elastic and high-temperature resistant rubber material, which not only enhances the durability of the sealing gasket 41 and / or sealing ring 31, but also ensures the sealing performance in high-temperature environments.

[0046] like Figure 6 , Figure 7 and Figure 8 As shown in Embodiment 2 of this utility model, the second sealing structure 40 is a mating protrusion 42 formed by protruding outward from the outer surface of the mating section 22. The mating protrusion 42 is arranged around the circumference of the valve core assembly 20 and is located between the first sealing structure 30 and the vent 23. The inner wall of the flow cavity 11 has a limiting protrusion 12, which abuts and seals with the mating protrusion 42 and axially limits the valve core assembly 20.

[0047] like Figure 6 , Figure 7 and Figure 8 As shown, the outer periphery of the protrusion 42 has a tapered arc surface 421; with the direction parallel to the axial direction of the valve core assembly 20 and pointing towards the inside of the flow cavity 11 as the first direction, the outer diameter of the tapered arc surface 421 gradually decreases along the first direction; the limiting protrusion 12 has a sharp corner that is circumferentially arranged around the inner wall of the flow cavity 11, and the sharp corner abuts against the tapered arc surface 421 to form an annular sealing line.

[0048] By setting the mating protrusion 42 in the second sealing structure 40 to cooperate with the limiting protrusion 12 on the valve assembly 10, not only is axial limiting provided, avoiding damage caused by excessive screwing of the valve core assembly 20 into the flow cavity 11, but also a more reliable sealing effect is achieved by forming an annular sealing line through the conical arc surface 421 on the mating protrusion 42 and the sharp corner on the limiting protrusion 12. Furthermore, the design that both the mating protrusion 42 and the limiting protrusion 12 are made of metal materials, compared with the sealing method that relies solely on rubber sealing rings, the metal-to-metal contact design has better high temperature and high pressure resistance, making it suitable for applications requiring higher sealing reliability.

[0049] like Figure 6As shown, the inner wall of the flow cavity 11 has an internal thread with an inner diameter of A and an outer diameter of B for the first sealing structure 30. The maximum outer diameter of the mating protrusion 42 is the outer diameter C of the valve core assembly 20, where A is greater than B and B is greater than C.

[0050] This design ensures that the sealing ring 31 can generate sufficient preload during installation, thus achieving a seal without additional tightening torque, and also prevents the sealing ring 31 from being scratched by the internal threads during installation. At the same time, this design also reasonably limits the compression of the sealing ring 31.

[0051] Optionally, both the protrusion 42 and the limiting protrusion 12 are made of metal.

[0052] With both the fitting protrusion 42 and the limiting protrusion 12 made of metal, the hardness and strength of the metal can ensure the stability and reliability of the sealing structure under long-term use and harsh working conditions; the use of metal also enables the second sealing structure 40 to withstand higher pressure, thereby improving the overall performance of the valve.

[0053] Optionally, the mating protrusion 42 and the mating section 22 are integrally formed, and the limiting protrusion 12 and the inner wall of the flow cavity 11 are integrally formed. This arrangement facilitates the processing and forming of the mating protrusion 42 and the limiting protrusion 12.

[0054] Optionally, there are multiple sealing rings 31 and multiple limiting grooves 221. The multiple limiting grooves 221 are arranged in a one-to-one correspondence with the multiple sealing rings 31, and the multiple limiting grooves 221 are spaced apart along the axial direction of the mating section 22.

[0055] By setting multiple limiting grooves 221 and multiple sealing rings 31 in a one-to-one manner, multiple sealing protections are provided for the valve structure, which greatly reduces the risk of gas leakage. The setting of multiple sealing rings 31 ensures that even if there is local damage or aging, the other sealing rings 31 can still maintain the sealing effect, which improves the durability and service life of the valve structure.

[0056] In summary, this utility model provides a valve structure. By spaced together a first sealing structure 30 and a second sealing structure 40 on the valve core assembly 20, the gap between the flow cavity 11 and the valve core assembly 20 is sealed, ensuring a sealing effect and preventing leakage due to loosening or failure of a single sealing structure. This ensures the long-term stability of the valve structure. By setting an interference fit between the outer periphery of the first sealing structure 30 and the inner wall of the flow cavity 11, unlike conventional torque-tightening sealing methods, the first sealing structure 30 in this utility model achieves sealing without relying on torque. The first sealing structure 30 only needs to contact the inner wall of the flow cavity 11 and maintain a certain pressure to reliably seal, without requiring torque from the valve core assembly 20 itself. Therefore, it can effectively solve the problem of valve core leakage caused by loose sealing rings in actual use. This utility model has a simple structure and low cost, is easy to assemble and maintain, can be derived from existing valve core structures without changing the external dimensions of the valve core structure, has good compatibility and does not affect normal use, and is suitable for large-scale promotion and use.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0059] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A valve structure, characterized in that, include: The valve assembly (10), valve core assembly (20), first sealing structure (30), and second sealing structure (40) are provided. The valve assembly (10) has a flow cavity (11) inside. The valve core assembly (20) is at least partially located in the flow cavity (11). The first sealing structure (30) and the second sealing structure (40) are respectively disposed on the outer periphery of the valve core assembly (20) and spaced apart along the axial direction of the valve core assembly (20). The outer periphery of the first sealing structure (30) is press-fitted with the inner wall of the flow cavity (11). The valve core assembly (20) is connected to the valve assembly (10) to generate an axial force along the axial direction of the valve core assembly (20), which is used to press the second sealing structure (40) against the inner wall of the flow cavity (11). The first sealing structure (30) and the second sealing structure (40) together seal the gap between the flow cavity (11) and the valve core assembly (20).

2. The valve structure according to claim 1, characterized in that, The valve core assembly (20) includes a connecting section (21) and a mating section (22) connected sequentially along the axial direction; the connecting section (21) is connected and mated with the inner wall of the flow cavity (11) to generate the axial force; the mating section (22) is provided with a limiting groove (221) formed by recessing from the outer surface inward; the first sealing structure (30) includes a sealing ring (31); a part of the sealing ring (31) is disposed in the limiting groove (221) and is limited and mated with the limiting groove (221); the limiting groove (221) is an annular groove and is arranged around the circumference of the mating section (22).

3. The valve structure according to claim 2, characterized in that, The connecting section (21) has an external thread, the inner wall of the flow cavity (11) has an internal thread, and the external thread mates with the internal thread; the inner diameter of the internal thread is A, the outer diameter of the sealing ring (31) is B, the maximum outer diameter of the mating section (22) is C, A is greater than B, and B is greater than C.

4. The valve structure according to claim 2, characterized in that, The second sealing structure (40) includes a sealing gasket (41) disposed on the mating section (22); the outer periphery of the sealing gasket (41) has a conical annular surface (411); with the direction parallel to the axial direction of the mating section (22) and pointing towards the interior of the flow cavity (11) as the first direction, the inner diameter of the conical annular surface (411) gradually decreases along the first direction; the inner wall of the flow cavity (11) has a conical hole for mating with the conical annular surface (411), and the conical hole is adapted to the conical annular surface (411).

5. The valve structure according to claim 4, characterized in that, The sealing gasket (41) and / or the sealing ring (31) are made of elastic material; The valve core assembly (20) has an openable and closable vent (23); the sealing gasket (41) is located between the first sealing structure (30) and the vent (23); Alternatively, the first sealing structure (30) is located between the sealing gasket (41) and the vent (23).

6. The valve structure according to claim 2, characterized in that, The valve core assembly (20) has an openable and closable vent (23); the second sealing structure (40) is a mating protrusion (42) that protrudes outward from the outer surface of the mating section (22), the mating protrusion (42) is arranged around the circumference of the valve core assembly (20) and is located between the first sealing structure (30) and the vent (23); the inner wall of the flow cavity (11) has a limiting protrusion (12), the limiting protrusion (12) abuts and seals with the mating protrusion (42), and axially limits the valve core assembly (20).

7. The valve structure according to claim 6, characterized in that, The outer periphery of the mating protrusion (42) has a tapered arc surface (421); with the direction parallel to the axial direction of the valve core assembly (20) and pointing towards the interior of the flow cavity (11) as the first direction, the outer diameter of the tapered arc surface (421) gradually decreases along the first direction; the limiting protrusion (12) has a sharp corner arranged circumferentially around the inner wall of the flow cavity (11), and the sharp corner abuts against the tapered arc surface (421) to form an annular sealing line.

8. The valve structure according to claim 6, characterized in that, The inner wall of the flow cavity (11) has an internal thread, the inner diameter of the internal thread is A, the outer diameter of the first sealing structure (30) is B, and the outer diameter of the valve core assembly (20) is the maximum outer diameter of the mating protrusion (42), where A is greater than B and B is greater than C.

9. The valve structure according to claim 6, characterized in that, Both the mating protrusion (42) and the limiting protrusion (12) are made of metal; and / or, the mating protrusion (42) and the mating section (22) are integrally formed, and the limiting protrusion (12) and the inner wall of the flow cavity (11) are integrally formed.

10. The valve structure according to claim 2, characterized in that, There are multiple sealing rings (31) and multiple limiting grooves (221). The multiple limiting grooves (221) are arranged one-to-one with the multiple sealing rings (31). The multiple limiting grooves (221) are arranged at intervals along the axial direction of the mating section (22).

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