Sealing structure and butterfly valve

Abstract

The sealing structure comprises a valve body, a valve rod and a sealing assembly, the valve body is provided with a valve cavity and a penetrating portion, the valve rod is arranged in the penetrating portion in a penetrating mode, and one end of the valve rod extends into the valve cavity; the sealing assembly comprises a first sealing piece and a plurality of second sealing pieces, the first sealing piece and all the second sealing pieces are sequentially arranged between the valve body and the valve rod, and all the second sealing pieces are tightly attached to one another and arranged on the side, away from the valve cavity, of the first sealing piece. Wherein the first sealing piece and the second sealing pieces have elasticity, all the second sealing pieces are provided with sealing faces arranged towards the valve cavity, under the action of medium pressure, the first sealing piece is suitable for deforming, all the sealing faces are suitable for expanding so as to make contact with the valve body and the valve rod respectively, and when no medium pressure exists, the sealing faces face the valve rod. The first sealing piece and the second sealing piece are both suitable for making contact with the valve body and the valve rod through elasticity. According to the sealing structure, the torque of the valve can be reduced, and the service life of the valve can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a sealing structure and a butterfly valve. Background Technology

[0002] Valves are control components in fluid transport systems, and there are many types and specifications of them. Among them, the butterfly valve is one of the many types of valves. The butterfly valve is also called a flap valve. It is a simple regulating valve that can be used for the on / off control of low-pressure pipeline media. The butterfly valve refers to a valve in which the closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing.

[0003] In existing technologies, the valve drive chain comprises all components that drive the valve between the operating device and the opening / closing element. It transmits loads or responds to loads. The torque and sealing performance of the valve drive chain directly affect the valve's lifespan and cost, making it a crucial factor in gaining market share. In existing drive chain structures, the valve stem needs to connect to external devices and the closing element within the valve cavity. This requires the valve stem to extend from the outside into the valve cavity, creating a gap between the valve stem and the valve body. This gap needs to be sealed to prevent media leakage. Currently, packing is typically used to fill the gap. Fasteners and media forces apply a preload to the packing assembly, causing it to deform under the preload and make full contact with the valve stem and body to cut off media flow.

[0004] However, existing butterfly valves achieve the effect of cutting off the flow of media by deforming the packing assembly under pre-tightening force, which increases the torque of the valve and greatly reduces its service life. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the defect of existing butterfly valves that use pre-tightening force to deform the packing assembly to cut off the flow of media, which increases the torque of the valve and greatly reduces its service life.

[0006] Therefore, this utility model provides a sealing structure, comprising:

[0007] A valve body and a valve stem, the valve body having a valve cavity and a through portion communicating with the outside and the valve cavity, the valve stem passing through the through portion and having one end extending into the valve cavity;

[0008] A sealing assembly includes a first seal and a plurality of second seals, wherein the first seal and all the second seals are sequentially disposed between the valve body and the valve stem, and all the second seals are in close contact with each other and disposed on the side of the first seal away from the valve cavity;

[0009] Both the first and second seals are elastic, and all of the second seals have a sealing surface facing the valve cavity. Under the action of medium pressure, the first seal is adapted to deform, and all of the sealing surfaces are adapted to expand to contact the valve body and the valve stem respectively. When there is no medium pressure, both the first and second seals are adapted to contact the valve body and the valve stem through elasticity.

[0010] Optionally, the sealing structure described above further includes a clamping assembly adapted to be connected to the valve body, and when the clamping assembly is connected to the valve body, one end of the clamping assembly extends into the through portion and abuts against the second seal.

[0011] Optionally, in the above-described sealing structure, the clamping assembly includes a clamping member and a pressure-applying member, the pressure-applying member being adapted to connect with the valve body, the clamping member being disposed between the pressure-applying member and the valve body, and one end of the clamping member abutting against the second sealing member.

[0012] Optionally, in the above-described sealing structure, the clamping member is provided with an abutting portion, which abuts against the valve body when the clamping member is connected to the valve body.

[0013] Optionally, in the above-described sealing structure, the clamping member is provided with a plurality of clearance portions; the sealing assembly further includes a plurality of third sealing members, any one of the third sealing members being disposed within one of the clearance portions to seal the gap between the clamping member and the valve body.

[0014] Optionally, in the sealing structure described above, the clamping member and the pressure applying member are respectively provided with a first clearance portion and a second clearance portion corresponding to the through portion, so that when the clamping member and the pressure applying member are connected to the valve body, the valve stem is adapted to pass through the first clearance portion, the second clearance portion and the through portion in sequence and extend into the valve cavity.

[0015] Optionally, the sealing structure described above further includes a support member, which is disposed on the side of the first seal member near the valve cavity and abuts against the first seal member.

[0016] Optionally, in the above-described sealing structure, the valve body has a mounting portion that communicates with the through portion, and the sealing assembly is disposed within the mounting portion.

[0017] Optionally, in the above-described sealing structure, the first sealing element is a plug ring, the second sealing element is a V-shaped packing, and the sealing surface is a V-shaped sealing surface.

[0018] A butterfly valve comprising the sealing structure described above.

[0019] The technical solution provided by this utility model has the following advantages:

[0020] 1. The sealing structure provided by this utility model includes a valve body, a valve stem, and a sealing assembly. The valve body has a valve cavity and a through portion connecting the valve cavity to the outside. The valve stem passes through the through portion, with one end extending into the valve cavity. The sealing assembly includes a first sealing element and a plurality of second sealing elements. The first sealing element and all the second sealing elements are sequentially disposed between the valve body and the valve stem. All the second sealing elements are tightly fitted together and disposed on the side of the first sealing element away from the valve cavity. The first sealing element and the second sealing element are both elastic. All the second sealing elements have a sealing surface facing the valve cavity. Under the action of medium pressure, the first sealing element is adapted to deform, and all the sealing surfaces are adapted to expand to contact the valve body and the valve stem respectively. When there is no medium pressure, the first sealing element and the second sealing element are adapted to contact the valve body and the valve stem through elasticity.

[0021] This sealing structure utilizes a sealing assembly positioned between the valve body and the valve stem. The valve body has a valve cavity and a through-hole connecting the valve cavity to the outside. In this embodiment, the through-hole is a through-hole through which the valve stem passes. One end of the valve stem extends into the valve cavity through the through-hole and connects to a valve core assembly located within the valve cavity. Under external force, the valve stem can move the valve core assembly within the valve cavity, thereby achieving the valve's control over the medium. The sealing assembly specifically includes a first sealing element and a second sealing element. In this embodiment, the first sealing element and the second sealing element are a plug ring and a V-type packing, respectively. The first and second sealing elements are sequentially positioned between the valve body and the valve stem. All the second sealing elements are tightly fitted together and positioned on the side of the first sealing element away from the valve cavity. Furthermore, both the first and second sealing elements are elastic. Therefore, when the first and second sealing elements are sequentially positioned between the valve body and the valve stem, and there is no medium pressure, both the first and second sealing elements can be self-adjusting. The elasticity of the first and second seals allows them to contact the valve body and stem, enabling them to jointly seal the gap between the valve body and stem, preventing the medium from leaking out. Simultaneously, each second seal has a sealing surface facing the valve cavity. Under medium pressure, the first seal deforms further, and the sealing surface of each second seal expands, allowing all sealing surfaces of the first and second seals to contact the valve body and stem, sealing the gap. In summary, the elastic first and second seals positioned between the valve body and stem allow them to deform without pre-tightening, relying on their own elasticity or the pressure of the medium to contact and seal the gap. This reduces valve torque and extends valve life.

[0022] 2. The sealing structure provided by this utility model further includes a clamping assembly, which is adapted to be connected to the valve body. When the clamping assembly is connected to the valve body, one end of the clamping assembly extends into the through portion and abuts against the second sealing element. The clamping assembly includes a clamping element and a pressure-applying element. The pressure-applying element is adapted to be connected to the valve body. The clamping element is disposed between the pressure-applying element and the valve body, and one end of the clamping element abuts against the second sealing element. The clamping element is provided with an abutting portion, which abuts against the valve body when the clamping element is connected to the valve body.

[0023] The sealing structure of this device utilizes a clamping assembly connected to the valve body. When connected, one end of the clamping assembly extends into the through-hole and abuts against the second seal. This provides support to the second seal under the influence of the medium, ensuring its position remains unchanged. Furthermore, the clamping assembly, in conjunction with the medium pressure, causes the sealing surface of the second seal to elastically expand, allowing it to contact the valve body and valve stem. The clamping assembly comprises a clamping element and a pressure-applying element, which in this embodiment are a clamping sleeve and a pressure plate, respectively. The pressure-applying element connects to the valve body, while the clamping element is positioned between them. When connected to the valve body, the clamping element is mounted on the valve body. Simultaneously, when mounted, one end of the clamping element extends into the through-hole and abuts against the second seal, providing support and preventing its position from changing under the influence of the medium. By providing an abutment portion on the clamping member, which in this embodiment is an abutment block, the abutment portion can abut against the valve body when the clamping member is installed on the valve body, so that the clamping member does not provide pre-tightening force to the sealing assembly, but only provides support to the sealing assembly when the sealing assembly is flushed by the medium.

[0024] 3. The sealing structure provided by this utility model includes a plurality of clearance portions on the clamping member; the sealing assembly also includes a plurality of third sealing members, each of which is disposed within a clearance portion to seal the gap between the clamping member and the valve body. The clamping member and the pressure-applying member are respectively provided with a first clearance portion and a second clearance portion corresponding to the through portion, so that when the clamping member and the pressure-applying member are connected to the valve body, the valve stem is adapted to pass through the first clearance portion, the second clearance portion, and the through portion in sequence and extend into the valve cavity. It also includes a support member, which is disposed on the side of the first sealing member near the valve cavity, and the support member abuts against the first sealing member.

[0025] The sealing structure of this device includes several clearance portions on the clamping member and several third seals. The clearance portions are specifically located on the portion of the clamping member that extends into the through-hole, and in this embodiment, they are clearance grooves. The third seals are rubber rings, each disposed within a clearance portion. When the clamping member is installed on the valve body with one end extending into the through-hole, the third seals seal the gap between the portion of the clamping member extending into the through-hole and the valve body and valve stem, further improving the valve's sealing performance. First and second clearance portions are respectively provided on the clamping member and the pressure-applying member. In this embodiment, the first and second clearance portions are respectively a first clearance hole and a second clearance hole. Both the first and second clearance portions correspond to the through-hole on the valve body. Therefore, when the clamping member and the pressure-applying member are sequentially installed on the valve body, the first and second clearance portions correspond to the through-hole, allowing the valve stem to sequentially pass through the first clearance portion, the second clearance portion, and the through-hole into the valve cavity. By means of a support member set between the valve body and the valve stem, the support member in this embodiment is a support pad ring. The support member is specifically set on the side of the first seal member near the valve cavity, and when the support member is installed in place, the first seal member can abut against the support member so that the support member supports the first seal member.

[0026] 4. The sealing structure provided by this utility model has a mounting part on the valve body that communicates with the through portion, and the sealing assembly is disposed in the mounting part. The first sealing element is a plug ring, the second sealing element is a V-shaped packing, and the sealing surface is a V-shaped sealing surface.

[0027] The sealing structure of this device utilizes a mounting portion on the valve body (in this embodiment, the mounting portion is a mounting groove) that is connected to the through portion. This allows the sealing assembly to be installed within the mounting portion when it is mounted between the valve body and the valve stem. The first sealing element is a plug ring, and the second sealing element is a V-shaped packing. The plug ring is elastic, thus satisfying the requirement for the first sealing element to be elastic. The V-shaped packing has a V-shaped end face, thus satisfying the requirement that the sealing surface of the second sealing element can expand under the scouring of the medium. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a plan view of the sealing structure provided in an embodiment of the present utility model;

[0030] Figure 2 This is a plan view of the sealing assembly provided in an embodiment of the present invention;

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Valve body; 11-Valve cavity;

[0033] 2-Sealing assembly; 21-First seal; 22-Second seal; 23-Third seal; 3-Pressure assembly; 31-Pressure member; 311-Abutting part; 32-Pressure application member; 4-Valve stem; 5-Bearing member. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and 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 of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] Example 1

[0039] This embodiment provides a sealing structure, such as Figure 1 and Figure 2As shown, the device includes a valve body 1, a valve stem 4, and a sealing assembly 2. The valve body 1 has a valve cavity 11 and a through portion connecting the valve cavity 11 to the outside. The valve stem 4 passes through the through portion, with one end extending into the valve cavity 11. The sealing assembly 2 includes a first sealing element 21 and a plurality of second sealing elements 22. The first sealing element 21 and all the second sealing elements 22 are sequentially disposed between the valve body 1 and the valve stem 4. All the second sealing elements 22 are tightly fitted together and disposed on the side of the first sealing element 21 away from the valve cavity 11. The first sealing element 21 and the second sealing element 22 are both elastic. All the second sealing elements 22 have a sealing surface facing the valve cavity 11. Under the action of medium pressure, the first sealing element 21 is adapted to deform, and all the sealing surfaces are adapted to expand to contact the valve body 1 and the valve stem 4 respectively. When there is no medium pressure, the first sealing element 21 and the second sealing element 22 are adapted to contact the valve body 1 and the valve stem 4 through elasticity.

[0040] The sealing structure described above utilizes a sealing assembly 2 disposed between the valve body 1 and the valve stem 4. The valve body 1 has a valve cavity 11 and a through-hole connecting the valve cavity 11 to the outside. In this embodiment, the through-hole is a through-hole. The valve stem 4 passes through the through-hole, with one end of the valve stem 4 extending into the valve cavity 11 through the through-hole and connecting with the valve core assembly disposed within the valve cavity 11. Under external force, the valve stem 4 can drive the valve core assembly within the valve cavity 11 to move, thereby achieving the valve's regulation of the medium. The sealing assembly 2 specifically includes a first sealing element 21 and a second sealing element 22. In this embodiment, the first sealing element 21 and the second sealing element 22 are a sealing ring and a V-shaped packing, respectively. The first sealing element 21 and the second sealing element 22 are sequentially disposed between the valve body 1 and the valve stem 4. All the second sealing elements 22 are tightly fitted together and are disposed on the side of the first sealing element 21 away from the valve cavity 11.

[0041] In addition, both the first seal 21 and the second seal 22 are elastic. Thus, when the first seal 21 and the second seal 22 are sequentially disposed between the valve body 1 and the valve stem 4, and there is no medium pressure, the first seal 21 and the second seal 22 can contact the valve body 1 and the valve stem 4 through their own elasticity. This allows the first seal 21 and the second seal 22 to jointly seal the gap between the valve body 1 and the valve stem 4, preventing the medium from flowing out of the gap between the valve body 1 and the valve stem 4 to the outside.

[0042] Meanwhile, each second seal 22 has a sealing surface facing the valve cavity 11, so that when the medium pressure is applied, the first seal 21 can be further deformed under the scouring of the medium, and the sealing surface of each second seal 22 can be expanded under the scouring of the medium, so that the sealing surfaces of the first seal 21 and all the second seals 22 can contact the valve body 1 and the valve stem 4, and seal the gap between the valve body 1 and the valve stem 4.

[0043] In summary, by using the elastic first seal 21 and second seal 22 disposed between the valve body 1 and the valve stem 4, the first seal 21 and the second seal 22 can deform by their own elasticity or the pressure of the medium without the need for pre-tightening force, thereby contacting the valve body 1 and the valve stem 4 and sealing the gap between the valve body 1 and the valve stem 4. This helps to reduce the torque of the valve and can extend the service life of the valve.

[0044] The sealing structure provided in this embodiment, such as Figure 1 As shown, it also includes a clamping assembly 3, which is adapted to be connected to the valve body 1. When the clamping assembly 3 is connected to the valve body 1, one end of the clamping assembly 3 extends into the through portion and abuts against the second seal 22.

[0045] The sealing structure described above, through the clamping assembly 3 connected to the valve body 1, allows the clamping assembly 3 to be connected to the valve body 1. When the clamping assembly 3 is connected to the valve body 1, one end of the clamping assembly 3 can extend into the through portion and abut against the second seal 22. Thus, when the second seal 22 is subjected to the scouring of the medium, the clamping assembly 3 can provide support to the second seal 22 and ensure that the position of the second seal 22 does not change. Furthermore, the clamping assembly 3 can cooperate with the medium pressure to cause the sealing surface of the second seal 22 to elastically expand, so that the sealing surface of the second seal 22 can contact the valve body 1 and the valve stem 4.

[0046] The sealing structure provided in this embodiment, such as Figure 1 As shown, the clamping assembly 3 includes a clamping member 31 and a pressure-applying member 32. The pressure-applying member 32 is adapted to be connected to the valve body 1. The clamping member 31 is disposed between the pressure-applying member 32 and the valve body 1, and one end of it abuts against the second sealing member 22.

[0047] The sealing structure described above includes a pressing component 3 comprising a pressing element 31 and a pressure-applying element 32. In this embodiment, the pressing element 31 and the pressure-applying element 32 are a pressing sleeve and a pressure plate, respectively. The pressure-applying element 32 can be connected to the valve body 1, while the pressing element 31 is disposed between the pressure-applying element 32 and the valve body 1. Thus, when the pressure-applying element 32 is connected to the valve body 1, the pressing element 31 can be installed on the valve body 1. At the same time, when the pressing element 31 is installed on the valve body 1, one end of it can extend into the through portion and abut against the second seal 22 to provide support for the second seal 22 and prevent the position of the second seal 22 from changing due to the scouring of the medium.

[0048] The sealing structure provided in this embodiment, such as Figure 1 and Figure 2 As shown, the clamping member 31 is provided with an abutting part 311, which abuts against the valve body 1 when the clamping member 31 is connected to the valve body 1.

[0049] The sealing structure described above, through the abutment portion 311 provided on the clamping member 31 (in this embodiment, the abutment portion 311 is an abutment block), when the clamping member 31 is installed on the valve body 1, the abutment portion 311 can abut against the valve body 1, so that the clamping member 31 will not provide pre-tightening force to the sealing assembly 2, but only when the sealing assembly 2 is flushed by the medium, the clamping member 31 can provide support for the sealing assembly 2.

[0050] The sealing structure provided in this embodiment, such as Figure 1 and Figure 2 As shown, the clamping member 31 has several clearance portions; the sealing assembly 2 also includes several third sealing members 23, any one of which is disposed in a clearance portion to seal the gap between the clamping member 31 and the valve body 1.

[0051] The sealing structure described above includes several clearance portions on the clamping member 31 and several third sealing members 23 provided by the sealing assembly 2. The clearance portions are specifically provided on the portion of the clamping member 31 that extends into the through portion, and in this embodiment, the clearance portion is a clearance groove. In this embodiment, the third sealing member 23 is a rubber ring. Each third sealing member 23 can be provided in a clearance portion, so that when the clamping member 31 is installed on the valve body 1 and one end of it extends into the through portion, the third sealing member 23 can seal the gap between the portion of the clamping member 31 extending into the through portion and the valve body 1 and the valve stem 4, thereby further improving the sealing performance of the valve.

[0052] The sealing structure provided in this embodiment, such as Figure 1 As shown, the clamping member 31 and the pressure applying member 32 are respectively provided with a first clearance portion and a second clearance portion corresponding to the through portion, so that when the clamping member 31 and the pressure applying member 32 are connected to the valve body 1, the valve stem 4 is adapted to pass through the first clearance portion, the second clearance portion and the through portion in sequence and extend into the valve cavity 11.

[0053] The sealing structure described above, through the first clearance portion and the second clearance portion respectively opened on the clamping member 31 and the pressure applying member 32, the first clearance portion and the second clearance portion in this embodiment are respectively the first clearance hole and the second clearance hole. The first clearance portion and the second clearance portion are both provided corresponding to the through portion on the valve body 1, so that when the clamping member 31 and the pressure applying member 32 are installed on the valve body 1 in sequence, the first clearance portion and the second clearance portion can correspond to the through portion, thereby allowing the valve stem 4 to pass through the first clearance portion, the second clearance portion and the through portion in sequence and extend into the valve cavity 11.

[0054] The sealing structure provided in this embodiment, such as Figure 1 and Figure 2 As shown, it also includes a carrier 5, which is disposed on the side of the first seal 21 near the valve cavity 11, and the carrier 5 abuts against the first seal 21.

[0055] The sealing structure described above uses a support member 5 disposed between the valve body 1 and the valve stem 4. In this embodiment, the support member 5 is a support pad ring. The support member 5 is specifically disposed on the side of the first seal 21 near the valve cavity 11. When the support member 5 is installed in place, the first seal 21 can abut against the support member 5 so that the support member 5 supports the first seal 21.

[0056] The sealing structure provided in this embodiment, such as Figure 1 and Figure 2 As shown, the valve body 1 has a mounting part that communicates with the through part, and the sealing assembly 2 is disposed in the mounting part.

[0057] The sealing structure described above, through the mounting part provided on the valve body 1, which in this embodiment is a mounting groove, and the mounting part and the through part are connected, so that when the sealing component 2 is installed between the valve body 1 and the valve stem 4, the sealing component 2 can be installed in the mounting part.

[0058] The sealing structure provided in this embodiment, such as Figure 2 As shown, the first sealing element 21 is a plug ring, and the second sealing element 22 is a V-shaped packing with a V-shaped sealing surface.

[0059] The sealing structure described above uses a plug ring as the first sealing element 21 and a V-shaped packing as the second sealing element 22. This is because the plug ring is elastic, which satisfies the requirement that the first sealing element 21 is elastic. The V-shaped packing has a V-shaped end face, which satisfies the requirement that the sealing surface of the second sealing element 22 can expand under the scouring of the medium.

[0060] The sealing structure provided by this utility model utilizes a sealing assembly 2 disposed between the valve body 1 and the valve stem 4. The valve body 1 has a valve cavity 11 and a through-hole connecting the valve cavity 11 to the outside. In this embodiment, the through-hole is a through-hole. The valve stem 4 passes through the through-hole, with one end extending into the valve cavity 11 through the through-hole and connecting to a valve core assembly disposed within the valve cavity 11. Under external force, the valve stem 4 can drive the valve core assembly within the valve cavity 11 to move, thereby achieving the valve's control over the medium. The sealing assembly 2 specifically includes a first sealing element 21 and a second sealing element 22. In this embodiment, the first seal 21 and the second seal 22 are a plug ring and a V-type packing, respectively. The first seal 21 and the second seal 22 are sequentially disposed between the valve body 1 and the valve stem 4. All the second seals 22 are tightly fitted together and are located on the side of the first seal 21 away from the valve cavity 11. Furthermore, both the first seal 21 and the second seal 22 are elastic. Therefore, when the first seal 21 and the second seal 22 are sequentially disposed between the valve body 1 and the valve stem 4, and there is no medium pressure, the first seal 21 and the second seal 22... Both the first seal 21 and the second seal 22 can contact the valve body 1 and the valve stem 4 through their own elasticity, thereby enabling the first seal 21 and the second seal 22 to jointly seal the gap between the valve body 1 and the valve stem 4, preventing the medium from flowing out of the gap between the valve body 1 and the valve stem 4 to the outside. At the same time, each second seal 22 has a sealing surface facing the valve cavity 11, so that when the medium pressure is applied, the first seal 21 can be further deformed under the scouring of the medium, and the sealing surface of each second seal 22 can be expanded under the scouring of the medium, thereby enabling the first seal 21 to be further deformed under the scouring of the medium. The sealing surfaces of the first and second seals 21 and 22 can contact the valve body 1 and valve stem 4, and seal the gap between the valve body 1 and valve stem 4. In summary, by providing elastic first and second seals 21 and 22 between the valve body 1 and valve stem 4, the first and second seals 21 and 22 can deform by their own elasticity or the pressure of the medium without the need for pre-tightening force, thereby contacting the valve body 1 and valve stem 4 and sealing the gap between the valve body 1 and valve stem 4. This helps to reduce the torque of the valve and extend the service life of the valve.

[0061] Example 2

[0062] This embodiment provides a butterfly valve, such as Figure 1 and Figure 2As shown, the butterfly valve includes the aforementioned sealing structure. The butterfly valve with the above-described structure includes the sealing structure described above, specifically through a sealing assembly 2 disposed between the valve body 1 and the valve stem 4. The valve body 1 has a valve cavity 11 and a through-hole connecting the valve cavity 11 to the outside. In this embodiment, the through-hole is a through-hole. The valve stem 4 passes through the through-hole, with one end of the valve stem 4 extending into the valve cavity 11 through the through-hole and connecting to the valve core assembly disposed within the valve cavity 11. Under external force, the valve stem 4 can drive the valve core assembly within the valve cavity 11 to move, thereby achieving the valve's function of regulating the medium. The sealing assembly 2 specifically includes a first sealing... The first seal 21 and the second seal 22, in this embodiment, are a plug ring and a V-type packing, respectively. The first seal 21 and the second seal 22 are sequentially disposed between the valve body 1 and the valve stem 4. All the second seals 22 are tightly fitted together and are all located on the side of the first seal 21 away from the valve cavity 11. Furthermore, both the first seal 21 and the second seal 22 are elastic. Therefore, when the first seal 21 and the second seal 22 are sequentially disposed between the valve body 1 and the valve stem 4, and there is no medium pressure, the first seal 21 and... The second seal 22 can contact the valve body 1 and valve stem 4 through its own elasticity, thereby enabling the first seal 21 and the second seal 22 to jointly seal the gap between the valve body 1 and valve stem 4, preventing the medium from flowing out of the gap between the valve body 1 and valve stem 4 to the outside. At the same time, each second seal 22 has a sealing surface facing the valve cavity 11, so that when the medium pressure is applied, the first seal 21 can be further deformed under the scouring of the medium, and the sealing surface of each second seal 22 can be expanded under the scouring of the medium, thereby making the first seal... The sealing surfaces of the first sealing element 21 and all the second sealing elements 22 can contact the valve body 1 and the valve stem 4, and seal the gap between the valve body 1 and the valve stem 4. In summary, by setting the elastic first sealing element 21 and the second sealing element 22 between the valve body 1 and the valve stem 4, the first sealing element 21 and the second sealing element 22 can deform by their own elasticity or the pressure of the medium without the need for pre-tightening force, so as to contact the valve body 1 and the valve stem 4 and seal the gap between the valve body 1 and the valve stem 4. This helps to reduce the torque of the valve and can extend the service life of the valve.

[0063] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A sealing structure, characterized in that, include: The valve body (1) and valve stem (4) are provided. The valve body (1) has a valve cavity (11) and a through portion that connects the outside to the valve cavity (11). The valve stem (4) passes through the through portion and one end of it extends into the valve cavity (11). The sealing assembly (2) includes a first seal (21) and a plurality of second seals (22). The first seal (21) and all the second seals (22) are sequentially disposed between the valve body (1) and the valve stem (4). All the second seals (22) are tightly attached to each other and disposed on the side of the first seal (21) away from the valve cavity (11). The first seal (21) and the second seal (22) are both elastic. All of the second seals (22) have a sealing surface facing the valve cavity (11). Under the action of medium pressure, the first seal (21) is adapted to deform and all of the sealing surfaces are adapted to expand to contact the valve body (1) and the valve stem (4) respectively. When there is no medium pressure, the first seal (21) and the second seal (22) are adapted to contact the valve body (1) and the valve stem (4) through elasticity.

2. The sealing structure according to claim 1, characterized in that, It also includes a clamping assembly (3), which is adapted to be connected to the valve body (1), and when the clamping assembly (3) is connected to the valve body (1), one end of the clamping assembly (3) extends into the through portion and abuts against the second seal (22).

3. The sealing structure according to claim 2, characterized in that, The clamping assembly (3) includes a clamping member (31) and a pressure-applying member (32). The pressure-applying member (32) is adapted to be connected to the valve body (1). The clamping member (31) is disposed between the pressure-applying member (32) and the valve body (1), and one end of it abuts against the second sealing member (22).

4. The sealing structure according to claim 3, characterized in that, The clamping member (31) is provided with an abutment part (311), which abuts against the valve body (1) when the clamping member (31) is connected to the valve body (1).

5. The sealing structure according to claim 4, characterized in that, The clamping member (31) has a plurality of clearance portions; the sealing assembly (2) also includes a plurality of third sealing members (23), any one of the third sealing members (23) is disposed in one of the clearance portions to seal the gap between the clamping member (31) and the valve body (1).

6. The sealing structure according to claim 5, characterized in that, The clamping member (31) and the pressure applying member (32) are respectively provided with a first clearance portion and a second clearance portion corresponding to the through portion, so that when the clamping member (31) and the pressure applying member (32) are connected to the valve body (1), the valve stem (4) is adapted to pass through the first clearance portion, the second clearance portion and the through portion in sequence and extend into the valve cavity (11).

7. The sealing structure according to any one of claims 1-6, characterized in that, It also includes a carrier (5), which is disposed on the side of the first seal (21) near the valve chamber (11) and abuts against the first seal (21).

8. The sealing structure according to claim 1, characterized in that, The valve body (1) has an installation part that communicates with the through part, and the sealing assembly (2) is disposed in the installation part.

9. The sealing structure according to claim 8, characterized in that, The first sealing element (21) is a plug ring, the second sealing element (22) is a V-shaped packing, and the sealing surface is a V-shaped sealing surface.

10. A butterfly valve, characterized in that, The sealing structure includes any one of claims 1-9.

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