Sealing structure and ball valve

Abstract

The invention discloses a sealing structure and a ball valve, and relates to the field of valves. The sealing structure comprises a valve body and a valve deck which are detachably arranged, and the sealing assembly, the valve body and the valve deck jointly define a flow channel. A mounting cavity is formed in the contact side of the valve body and the valve cover; the sealing assembly comprises a first sealing piece and a second sealing piece which are arranged in a spaced mode, and the second sealing piece is arranged in the mounting cavity. Double sealing is established through the first sealing piece and the second sealing piece, the first sealing piece can be arranged between the valve body and the valve cover in a pre-tightening mode to achieve self-sealing, and the bias pressure of the first sealing piece can reduce the mounting gap for assembling the second sealing piece, so that sealing of the second sealing piece is further enhanced under the bias pressure effect of the first sealing piece; good sealing conditions between the valve body and the valve cover can be guaranteed, leakage of pressure media in the valve is effectively prevented, and the valve adopting the sealing structure can meet the use requirement of higher medium pressure.

Description

Technical Field

[0001] The present invention relates to the field of valves, and in particular to a sealing structure and a ball valve. Background Art

[0002] The development of offshore oil and gas fields is increasing. Due to the unique environments in which they operate, the media pressures are high and the media types are complex. During actual development and transportation, media pressures tend to increase. Valves controlling the transportation routes often operate in toxic environments, such as those containing high levels of hydrogen sulfide, aniline, and hydrogen chloride. This places higher demands on sealing and lifespan design for these specific toxic and corrosive environments. Conventional valve body and bonnet seals typically utilize O-rings or graphite gaskets, which are difficult to meet the high media pressures, toxic and corrosive media, and corrosive conditions found in offshore oil and gas field transportation systems. Summary of the Invention

[0003] In order to solve the problems raised in the above background technology, the present invention provides a sealing structure, comprising:

[0004] A detachable valve body and valve cover, wherein the valve body and the valve cover together enclose a flow channel; a mounting cavity is provided on the contact side of the valve body and the valve cover;

[0005] A sealing assembly includes a first sealing member and a second sealing member arranged at intervals, wherein the second sealing member is arranged in the mounting cavity, the first sealing member is arranged between the valve body and the valve cover, the first sealing member is configured with a biasing force suitable for reducing the volume of the mounting cavity, and the second sealing member is compressed and clamped between the valve body and the valve cover under the action of the biasing force.

[0006] Optionally, a recess is provided on the end surface of the valve body facing the valve cover, and a protrusion is provided on the end surface of the valve cover facing the valve body. When the valve body and the valve cover are assembled, the protrusion partially enters the recess to form the installation cavity.

[0007] Optionally, a limiting portion is provided on the valve body, and when the valve body and the valve cover are assembled, the limiting portion is suitable for being set in a limiting position with the raised portion, and the first sealing member is suitable for acting on the limiting portion to approach the installation cavity, reducing the gap between the limiting portion and the raised portion, so that the limiting portion presses the second sealing member.

[0008] Optionally, the valve cover is provided with an avoidance portion, the first sealing member is provided at the avoidance portion, and when the valve body and the valve cover are assembled, the first sealing member is pressed between the valve body and the valve cover.

[0009] Optionally, the valve cover is provided with an assembly portion, and the assembly portion is communicated with the avoidance portion;

[0010] The sealing assembly also includes a limit member, which is installed in the assembly portion. The limit member extends toward one end of the valve body into the avoidance portion. The limit member and the valve cover are suitable for jointly limiting and fixing the first sealing member. When the valve body and the valve cover are assembled, the first sealing member is fixedly arranged in the space enclosed by the valve body, the valve cover and the limit member.

[0011] Optionally, the limiting member is configured as a ring-shaped structure, and the limiting member and the assembly portion are configured to correspond to each other; or

[0012] There are multiple limiting members, each of which is a centrally symmetrical connecting block structure, and the limiting members and the assembly portion are configured to correspond to each other.

[0013] Optionally, the installation cavity is configured as an annular structure, and the second sealing member is configured as an annular structure conforming to the installation cavity.

[0014] Optionally, the acting direction of the biasing force of the first sealing component intersects with the radial plane of the installation cavity.

[0015] A ball valve comprises the above-mentioned sealing structure.

[0016] Optionally, the ball valve further includes a plurality of connecting members, wherein the connecting members are used to connect the valve body and the valve cover, and the plurality of connecting members are arranged at intervals from each other.

[0017] The technical solution provided by the present invention has the following advantages:

[0018] The sealing structure provided by the present invention includes a detachable valve body and valve cover, and a sealing assembly, the valve body and valve cover together enclose a flow channel; the contact side of the valve body and the valve cover is provided with an installation cavity; the sealing assembly includes a first seal and a second seal arranged at intervals, the second seal is arranged in the installation cavity, the first seal is arranged between the valve body and the valve cover, the first seal is configured with a biasing force suitable for reducing the volume of the installation cavity, and the second seal is compressed and clamped between the valve body and the valve cover under the action of the biasing force.

[0019] The sealing structure of this structure establishes a double seal through the first seal and the second seal. For the first seal, it establishes a first seal, and the first seal can be pre-tightened and arranged between the valve body and the valve cover to achieve self-sealing; on the other hand, the biasing force can act on the valve body and the valve cover to produce local relative movement, thereby reducing the installation gap for assembling the second seal, so that the second seal further strengthens the seal under the action of the biasing force of the first seal; for the second seal, it establishes a second seal, and the second seal is pressed into the installation cavity under pressure to establish a local sealing environment; thereby ensuring good sealing conditions between the valve body and the valve cover, effectively preventing leakage of the pressure medium in the valve, so that the valve using this sealing structure can meet the use requirements of higher medium pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of the sealing structure provided by the present invention;

[0022] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0023] Figure 3 A schematic diagram of the partial structure of the valve body and valve cover in the sealing structure provided by the present invention;

[0024] Description of reference numerals:

[0025] 1-valve body; 11-recessed portion; 12-limiting portion;

[0026] 2-valve cover; 21-protrusion; 22-avoidance portion; 23-assembly portion;

[0027] 3-valve seat; 4-valve stem; 5-valve ball;

[0028] 6-first sealing member; 7-limiting member; 8-second sealing member;

[0029] 9-Connecting parts. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Example 1

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connect," "connected," and "connection" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Example 1

[0040] This embodiment provides a sealing structure that is suitable for use in high medium pressure scenarios. Figures 1 to 3 The sealing structure includes a detachable valve body 1 and a valve cover 2, and a sealing assembly. The valve body 1 and the valve cover 2 together enclose a flow channel; a mounting cavity is provided on the contact side of the valve body 1 and the valve cover 2; the sealing assembly includes a first sealing member 6 and a second sealing member 8 arranged at intervals, the second sealing member 8 is arranged in the mounting cavity, the first sealing member 6 is arranged between the valve body 1 and the valve cover 2, the first sealing member 6 is configured with a biasing force suitable for reducing the volume of the mounting cavity, and the second sealing member 8 is compressed and clamped between the valve body 1 and the valve cover 2 under the action of the biasing force.

[0041] Specifically, the first seal 6 is configured as a TFE energy storage ring structure, and the first seal 6 is arranged in the movement direction of the valve cover 2 approaching the valve body 1 under the action of pressure, so that when the medium pressure increases, the sealing force of the first seal 6 can also increase; the initial sealing force of the first seal 6 is provided by its own elastic capacity, and the medium force and elastic capacity can ensure high and low pressure sealing requirements.

[0042] In one embodiment, the valve cover 2 is provided with an annular flange structure. When the valve body 1 and the valve cover 2 are assembled, the annular flange structure is connected inside the valve body 1, and the first sealing member 6 is provided as an annular structure, and the first sealing member 6 is sleeved outside the annular flange structure.

[0043] The second sealing member 8 is configured as graphite or a graphite spiral wound gasket, which has good fire protection function. The sealing force thereof is provided by the connection force between the valve body 1 and the valve cover 2 and the biasing force of the first sealing member 6 .

[0044] In this embodiment, see Figure 3The valve body 1 has a recessed portion 11 on its end surface facing the valve cover 2, and a raised portion 21 on its end surface facing the valve body 1. When the valve body 1 and the valve cover 2 are assembled, the raised portion 21 partially enters the recessed portion 11 to form an installation cavity. Of course, the valve body 1 can be provided with a raised portion and the valve cover 2 can be provided with a recessed portion to achieve the same assembly effect.

[0045] See also Figure 3 A limiting portion 12 is provided on the valve body 1. When the valve body 1 and the valve cover 2 are assembled, the limiting portion 12 is suitable for being set in a limiting position with the raised portion 21. The first sealing member 6 is suitable for acting on the limiting portion 12 to approach the installation cavity, reducing the gap between the limiting portion 12 and the raised portion 21, so that the limiting portion 12 presses the second sealing member 8.

[0046] In order to facilitate the pressure contact of the limiting portion 12 on the second sealing member 8, the force contact area between the limiting portion 12 and the valve cover 2 is set at a position close to the first sealing member 6; for details, see Figure 2 and Figure 3 The limiting portion 12 is provided with an inclined surface structure, which is provided on the side of the limiting portion 12 away from the second sealing member 8. The inclined surface structure does not participate in the contact with the valve cover 2. When the biasing force of the second sealing member 8 acts on the limiting portion 12, the limiting portion 12 can better press the first sealing member 6; at the same time, this arrangement is conducive to avoiding the limiting portion 12 from being limited by the valve cover 2, thereby avoiding affecting the sealing effect.

[0047] In this embodiment, the end surface of the limiting portion 12 contacting the second sealing member 8 can be configured as a flat structure. Of course, the end surface of the limiting portion 12 contacting the second sealing member 8 is conformally configured to the corresponding end surface of the second sealing member 8.

[0048] The sealing structure provided in this embodiment establishes a double seal through the first seal 6 and the second seal 8. For the first seal 6, it establishes a first seal, and the first seal 6 can be pre-tightened and arranged between the valve body 1 and the valve cover 2 to achieve self-sealing; on the other hand, the biasing force of the first seal 6 can act on the valve body 1 and the valve cover 2 to produce local relative movement, thereby reducing the installation gap for assembling the second seal 8, so that the second seal 8 further strengthens the seal under the biasing force of the first seal 6; for the second seal 8, it establishes a second seal, and the second seal 8 is pressed into the installation cavity under pressure to establish a local sealing environment; thereby ensuring good sealing conditions between the valve body 1 and the valve cover 2, effectively preventing leakage of the pressure medium in the valve, so that the valve using this sealing structure can meet the use requirements of higher medium pressure.

[0049] The sealing structure provided by the present invention can reduce costs and improve sealing performance through a double sealing structure.

[0050] In some embodiments, see Figure 3The valve cover 2 is provided with an avoidance portion 22 , and the first sealing member 6 is provided at the avoidance portion 22 . When the valve body 1 and the valve cover 2 are assembled, the first sealing member 6 is pressed between the valve body 1 and the valve cover 2 .

[0051] Further, see Figure 2 and Figure 3 The valve cover 2 is provided with an assembly portion 23, which is in communication with the escape portion 22. The sealing assembly also includes a stopper 7, which is mounted within the assembly portion 23 and extends toward one end of the valve body 1 into the escape portion 22. The stopper 7 and the valve cover 2 are adapted to jointly position and secure the first sealing member 6. When the valve body 1 and the valve cover 2 are assembled, the first sealing member 6 is fixedly disposed within the space enclosed by the valve body 1, the valve cover 2, and the stopper 7. The first sealing member 6 is secured between the valve body 1 and the valve cover 2 by the stopper 7. The stopper 7 can be a snap ring structure, which can minimize the weight of the valve to meet the weight restrictions on valves on offshore platforms.

[0052] In one embodiment, an annular step structure is provided on the valve cover 2 , and the valve body 1 is assembled and overlapped on the annular step structure to form an avoidance portion 22 .

[0053] In one embodiment, the limiting member 7 is configured as a ring-shaped structure, and the limiting member 7 and the assembly portion 23 are configured to correspond to each other.

[0054] In one embodiment, a plurality of limiting members 7 are provided, and the limiting members 7 are centrally symmetrical connecting block structures, and the limiting members 7 and the assembly portion 23 are provided in conformal correspondence.

[0055] In some embodiments, the installation cavity is configured as an annular structure, and the second sealing member 8 is configured as an annular structure conforming to the installation cavity.

[0056] In some embodiments, the biasing force of the first sealing member 6 acts in a direction intersecting the radial plane of the installation cavity. In an exemplary embodiment, the biasing force of the first sealing member 6 acts in a direction perpendicular to the radial plane of the installation cavity.

[0057] Example 2

[0058] This embodiment provides a ball valve. Figure 1 The ball valve includes the sealing structure of Example 1. The sealing structure can provide reliable sealing between the valve body 1 and the valve cover 2, thereby effectively preventing leakage of the pressure medium in the valve, so that the ball valve adopting this sealing structure can meet the use requirements of higher medium pressure.

[0059] join Figure 1The ball valve also includes several connectors 9, which are used to connect the valve body 1 and the valve cover 2. The connectors 9 are spaced apart from each other. The connectors 9 can be threaded fasteners, such as studs and nuts. The sealing force required by the second seal 8 is provided by the studs and nuts connecting the valve body 1 and the valve cover 2. The torque required to pre-tighten the studs and nuts must meet the design requirements of the actual environment.

[0060] join Figure 1 The ball valve also includes a valve seat 3, a valve stem 4 and a valve ball 5. The valve seat 3 is arranged in the valve body 1 and the valve cover 2. The valve seat 3 and the valve ball 5 are connected. The valve stem 4 and the valve ball 5 are fixedly arranged. The valve stem 4 is connected to an external driving actuator. The valve stem 4 and the valve ball 5 are driven to rotate by the external driving actuator to open or close the flow channel.

Claims

1. A sealing structure, characterized in that: include: A detachably configured valve body (1) and a valve cover (2), wherein the valve body (1) and the valve cover (2) together enclose a flow channel; a mounting cavity is provided on the contact sides of the valve body (1) and the valve cover (2); A sealing assembly comprises a first sealing member (6) and a second sealing member (8) arranged at intervals, wherein the second sealing member (8) is arranged in the installation cavity, the first sealing member (6) is arranged between the valve body (1) and the valve cover (2), the first sealing member (6) is provided with a biasing force suitable for reducing the volume of the installation cavity, and the second sealing member (8) is compressed and clamped between the valve body (1) and the valve cover (2) under the action of the biasing force.

2. The sealing structure according to claim 1, wherein: The valve body (1) is provided with a recessed portion (11) on the end surface facing the valve cover (2), and the valve cover (2) is provided with a raised portion (21) on the end surface facing the valve body (1). When the valve body (1) and the valve cover (2) are assembled, the raised portion (21) partially enters the recessed portion (11) to form the installation cavity.

3. The sealing structure according to claim 2, characterized in that: The valve body (1) is provided with a limiting portion (12). When the valve body (1) and the valve cover (2) are assembled, the limiting portion (12) is suitable for being set to limit the protrusion (21). The first sealing member (6) is suitable for acting on the limiting portion (12) to approach the installation cavity, reducing the gap between the limiting portion (12) and the protrusion (21), so that the limiting portion (12) is pressed against the second sealing member (8).

4. The sealing structure according to claim 3, characterized in that: The valve cover (2) is provided with an avoidance portion (22), and the first sealing member (6) is arranged at the avoidance portion (22). When the valve body (1) and the valve cover (2) are assembled, the first sealing member (6) is pressed between the valve body (1) and the valve cover (2).

5. The sealing structure according to claim 4, characterized in that: The valve cover (2) is provided with an assembly portion (23), and the assembly portion (23) and the avoidance portion (22) are arranged in communication; The sealing assembly further comprises a limiting member (7), wherein the limiting member (7) is mounted in the assembly portion (23), and the limiting member (7) extends toward one end of the valve body (1) into the avoidance portion (22), and the limiting member (7) and the valve cover (2) are adapted to jointly limit and fix the first sealing member (6), and when the valve body (1) and the valve cover (2) are assembled, the first sealing member (6) is fixedly arranged in a space enclosed by the valve body (1), the valve cover (2) and the limiting member (7).

6. The sealing structure according to claim 5, characterized in that: The limiting member (7) is configured as a ring-shaped structure, and the limiting member (7) and the assembly portion (23) are configured to correspond to each other; or A plurality of the limiting members (7) are provided, and the limiting members (7) are centrally symmetrical connecting block structures. The limiting members (7) and the assembly portion (23) are provided in a conforming corresponding manner.

7. The sealing structure according to claim 2, characterized in that: The installation cavity is configured as an annular structure, and the second sealing member (8) is configured as an annular structure configured to conform to the installation cavity.

8. The sealing structure according to claim 7, characterized in that: The action direction of the biasing force configured for the first sealing member (6) intersects with the radial plane of the installation cavity.

9. A ball valve, characterized in that: The sealing structure comprises the sealing structure according to any one of claims 1 to 8.

10. The ball valve according to claim 9, characterized in that The ball valve further comprises a plurality of connecting members (9), wherein the connecting members (9) are used to connect the valve body (1) and the valve cover (2), and the plurality of connecting members (9) are arranged at intervals from each other.

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