Self-tightening valve seat and floating ball valve

Abstract

The utility model discloses a self-tightening type valve seat which comprises two first valve seats, two fireproof valve seats and two pressing parts, the pressing parts are used for being fixedly connected to the fireproof valve seats and the inner wall of a valve body, and the pressing parts are used for applying pre-tightening force to the fireproof valve seats in the direction close to a ball. The peripheral face of each fireproof valve seat is used for being attached to the inner wall face of the valve body and one side face of the first valve seat in a sealed mode, the side face, opposite to the fireproof valve seats, of the first valve seat is provided with a first conical face and a second conical face which are annularly arranged, and the side face, opposite to the first valve seat, of each fireproof valve seat is provided with a third conical face and a fourth conical face which are annularly arranged. The first conical surface and the third conical surface can be hermetically attached, and the second conical surface and the fourth conical surface can be hermetically attached; an arc-shaped sealing surface matched with the local shape of the outer side surface of the ball body is arranged at the inner end of the side surface, close to the ball body, of the fireproof valve seat. According to the self-tightening valve seat, the fireproof sealing performance is improved. The utility model further provides a floating ball valve.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a self-tightening valve seat and a floating ball valve. Background Art

[0002] Due to its own advantages, ball valves have been widely used in many industries. For example, floating ball valves are widely used in urban gas pipelines. Figure 1 As shown in FIG. 1 , the opening and closing part of a conventional floating ball valve is usually a ball 1 with a through hole in the middle equal to the diameter of the pipeline. A soft sealing valve seat 21 is disposed at each of the inlet and outlet ends, and is contained in a metal valve body 3. When the ball valve is in a closed position, the medium pressure at the inlet end acts on the ball 1, generating a force to push the ball 1, so that the ball is pressed tightly against the valve seat 21 at the outlet end, generating a contact stress on the conical surface of the sealing valve seat 21, forming a contact zone. The force per unit area of ​​the contact zone is called the working specific pressure of the valve seal. When this specific pressure is greater than the specific pressure required for sealing, the valve has obtained a sealing state. Effective sealing, thereby achieving self-sealing of the medium; when the floating ball valve is in the closed position, the medium force at the inlet end acts on the ball, causing a slight displacement of the geometric center of the ball, which is in close contact with the valve seat at the outlet end, increasing the contact stress on the valve seat, thereby obtaining a reliable seal; and the pre-tightening force between the valve seat at the inlet end and the ball will be reduced, affecting the sealing performance of the inlet sealing valve seat; and when the medium pressure is low, the valve sealing working pressure is small, which is prone to leakage; in addition, since the valve seat is made of soft sealing material, it is easy to be damaged in a fire or long-term high temperature environment, resulting in loss of sealing performance. Utility Model Content

[0003] The purpose of the utility model is to provide a self-tightening valve seat and a floating ball valve to solve the problems existing in the above-mentioned prior art and improve the fireproof sealing performance.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] The utility model provides a self-tightening valve seat, comprising two first valve seats respectively arranged on the inlet side and the outlet side of a sphere, the first valve seats being used to seal and fit the outer side surface of the sphere and the inner wall surface of the valve body; each of the first valve seats is provided with a fire valve seat on the side away from the sphere, the fire valve seat and the first valve seat both have a flow channel connected to a medium channel; and each of the fire valve seats is provided with a pressing component on the side away from the first valve seat, the pressing component being used to be fixedly connected to the fire valve seat and the inner wall surface of the valve body, the pressing component being used to press the fire valve seat in a direction close to the sphere The valve seat applies a pre-tightening force; the outer peripheral surface of each fire valve seat is used to seal and fit against the inner wall surface of the valve body and a side surface of the first valve seat, the first valve seat has a first conical surface and a second conical surface arranged circumferentially on the side surface opposite to the fire valve seat, the fire valve seat has a third conical surface and a fourth conical surface arranged circumferentially on the side surface opposite to the first valve seat, the first conical surface and the third conical surface can be sealably fitted, and the second conical surface and the fourth conical surface can be sealably fitted; and the inner end of the side surface of the fire valve seat close to the sphere is also provided with an arcuate sealing surface matching the local shape of the outer side surface of the sphere.

[0006] Preferably, the side of the first valve seat opposite to the fire damper seat further comprises a first annular surface arranged between the first conical surface and the second conical surface, and the side of the fire damper seat opposite to the first valve seat further comprises a second annular surface arranged between the third conical surface and the fourth conical surface; the first annular surface and the second annular surface can be sealingly fitted.

[0007] Preferably, the fire damper seat is made of metal.

[0008] Preferably, at least one first sealing ring is embedded on the outer peripheral surface of the first valve seat.

[0009] Preferably, at least one second sealing ring is embedded on the outer peripheral surface of the fire damper seat.

[0010] Preferably, each of the first valve seats is provided with a first sealing surface on the side close to the sphere, which can be sealingly fitted to the outer side of the sphere.

[0011] Preferably, each of the first valve seats is made of polytetrafluoroethylene.

[0012] Preferably, each of the pressing components is configured as a spring.

[0013] The utility model also provides a floating ball valve, comprising a valve body, a ball and the self-tightening valve seat as described above, wherein the ball is movably arranged in the valve body, and the self-tightening valve seat is sealingly arranged at the inlet side and the outlet side of the ball.

[0014] Compared with the prior art, the utility model has achieved the following technical effects:

[0015] The utility model provides a self-tightening valve seat, in which the inlet side and the outlet side of the ball are both provided with a first valve seat, the first valve seat is sealingly fitted to the ball and the valve body, and a fire valve seat is further provided on the side of each first valve seat away from the ball, the fire valve seat can be sealingly fitted to the first valve seat and the valve body, and a clamping component is provided between the fire valve seat and the valve body, the clamping component can apply a pre-tightening force to the fire valve seat to clamp the first valve seat, thereby improving the sealing performance of the first valve seat and the ball, so that even if the medium pressure is high and the ball is displaced, the first valve seat on the inlet side of the ball can always maintain a sealing fit with the ball, and even if the medium pressure is low, the pre-tightening force of the clamping component The force can compensate for the sealing working specific pressure, thereby improving the sealing performance; the first cone surface and the third cone surface between the first valve seat and the fire valve seat are sealed and fitted, and the second cone surface and the fourth cone surface are sealed and fitted, relying on the wedging principle of the double cone surfaces and the pre-tightening force of the clamping component to form a double self-tightening seal to improve the sealing performance; in addition, the fire valve seat is used to be close to the sphere. The inner end of the side surface is also provided with an arc-shaped sealing surface that matches the local shape of the outer side surface of the sphere. When the first sealing seat melts and fails in a fire or high temperature environment, the fire valve seat can be close to the sphere under the action of the clamping component and make the arc-shaped sealing surface seal against the sphere to further maintain the seal, thereby improving the fire protection performance.

[0016] The utility model also provides a floating ball valve, including the above-mentioned self-tightening valve seat, the first conical surface and the third conical surface between the first valve seat and the fire valve seat of the self-tightening valve seat are sealed together, and the second conical surface and the fourth conical surface are sealed together, relying on the wedging principle of the double conical surfaces and the pre-tightening force of the clamping component to form a double self-tightening seal to improve the sealing performance; in addition, the fire valve seat is used to be close to the inner end of the side of the sphere and is also provided with an arc-shaped sealing surface matching the local shape of the outer side of the sphere. When the first valve seat melts and fails in a fire or high-temperature environment, the fire valve seat can be close to the sphere under the action of the clamping component and make the arc-shaped sealing surface seal against the sphere to further maintain the seal, thereby improving the fire prevention performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structure of a traditional floating ball valve;

[0019] Figure 2A schematic diagram of the structure of a floating ball valve provided in Example 2;

[0020] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0021] Figure 4 A schematic diagram of the structure of the first valve seat provided in Example 1;

[0022] Figure 5 A schematic diagram of the structure of the fire damper seat provided in Example 1;

[0023] In the figure: 1-sphere; 2-first valve seat; 3-valve body; 4-fire valve seat; 5-flow channel; 6-pressing component; 7-first cone surface; 8-second cone surface; 9-third cone surface; 10-fourth cone surface; 11-arc sealing surface; 12-first annular surface; 13-second annular surface; 14-first sealing ring; 15-second sealing ring; 16-first sealing surface; 17-valve stem; 18-handle; 19-packing; 20-packing pressure plate; 21-valve seat. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The purpose of the utility model is to provide a self-tightening valve seat and a floating ball valve to solve the problems existing in the above-mentioned prior art and improve the fireproof sealing performance.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Embodiment 1

[0028] This embodiment provides a self-tightening valve seat. Figure 2-Figure 5, including two first valve seats 2 respectively arranged on the inlet side and the outlet side of the ball 1, the first valve seats 2 are used to seal and fit the outer side of the ball 1 and the inner wall of the valve body 3; each first valve seat 2 is provided with a fire damper seat 4 on the side away from the ball 1, and the fire damper seat 4 and the first valve seat 2 have a flow channel 5 connected to the medium channel, and the flow channel 5 facilitates the flow of the medium; and each fire damper seat 4 is provided with a pressing component 6 on the side away from the first valve seat 2, the pressing component 6 is used to be fixedly connected to the fire damper seat 4 and the inner wall of the valve body 3, and the pressing component 6 is used to apply a pre-tightening force to the fire damper seat 4 in the direction close to the ball 1; see Figure 4 and Figure 5 The outer peripheral surface of each fire damper seat 4 is used to seal and fit against the inner wall surface of the valve body 3 and one side surface of the first valve seat 2. The side surface of the first valve seat 2 opposite to the fire damper seat 4 has a first conical surface 7 and a second conical surface 8 arranged in an annular direction. The side surface of the fire damper seat 4 opposite to the first valve seat 2 has a third conical surface 9 and a fourth conical surface 10 arranged in an annular direction. The first conical surface 7 and the third conical surface 9 can be sealed and fit, and the second conical surface 8 and the fourth conical surface 10 can be sealed and fit; and the inner end of the side surface of the fire damper seat 4 close to the sphere 1 is also provided with an arcuate sealing surface 11 matching the local shape of the outer side surface of the sphere 1.

[0029] A first valve seat 2 is provided on both the inlet and outlet sides of the sphere 1. The first valve seat 2 is sealingly fitted to the sphere 1 and the valve body 3. A fire valve seat 4 is also provided on the side of each first valve seat 2 away from the sphere. The fire valve seat 4 can be sealingly fitted to the first valve seat 2 and the valve body 3. A pressing component 6 is provided between the fire valve seat 4 and the valve body 3. The pressing component 6 can apply a pre-tightening force to the fire valve seat 4 to press the first valve seat 2, thereby improving the sealing performance of the first valve seat 2 and the sphere 1. In this way, even if the medium pressure is large and the sphere 1 is displaced, the first valve seat 2 on the inlet side of the sphere 1 can always maintain a sealing fit with the sphere 1, and even if the medium pressure is small, the pre-tightening force of the pressing component 6 can compensate The sealing working pressure ratio is increased, thereby improving the sealing performance; the first cone surface 7 and the third cone surface 9 between the first valve seat 2 and the fire valve seat 4 are sealed and fitted, and the second cone surface 8 and the fourth cone surface 10 are sealed and fitted, relying on the wedging principle of the double cone surfaces and the pre-tightening force of the clamping component 6 to form a double self-tightening seal to improve the sealing performance; in addition, the fire valve seat 4 is used to be close to the spherical body 1. The inner end of the side surface is also provided with an arc-shaped sealing surface 11 matching the local shape of the outer side surface of the spherical body 1. When the first valve seat 2 melts and fails in a fire or high temperature environment, the fire valve seat 4 can be close to the spherical body 1 under the action of the clamping component 6 and make the arc-shaped sealing surface 11 seal and fit the spherical body 1, so as to further maintain the seal, thereby improving the fire prevention performance.

[0030] Specifically, the small-diameter ends of the first conical surface 7 and the second conical surface 8 as well as the third conical surface 9 and the fourth conical surface 10 are all arranged close to the sphere 1 .

[0031] Specifically, the inner diameter of the fire damper seat 4 is consistent with the inner diameter of the valve body 3 .

[0032] In the optional scheme of this embodiment, it is more preferred that the side of the first valve seat 2 opposite to the fire damper seat 4 also has a first annular surface 12 arranged between the first conical surface 7 and the second conical surface 8, and the side of the fire damper seat 4 opposite to the first valve seat 2 also has a second annular surface 13 arranged between the third conical surface 9 and the fourth conical surface 10; the first annular surface 12 and the second annular surface 13 can be sealed and fitted, wherein the first annular surface 12 and the second annular surface 13 coincide with the axis of the valve body 3, and can cooperate with each other and perform axial guidance, so that the fire damper seat 4 and the first valve seat 2 fit better, providing an axial displacement channel of pre-tightening force for the double self-tightening seal.

[0033] In the optional solutions of this embodiment, it is more preferred that the fire damper seat 4 is set to be made of metal material to improve the fire protection performance.

[0034] In the optional scheme of this embodiment, it is more preferred that at least one first sealing ring 14 is embedded on the outer peripheral surface of the first valve seat 2 to further improve the sealing performance between the valve body 3, wherein the first sealing ring 14 can be set as an O-ring, and the number can be determined according to actual needs.

[0035] In the optional scheme of this embodiment, it is more preferred that at least one second sealing ring 15 is embedded on the outer peripheral surface of the fire damper seat 4, wherein the second sealing ring 15 can be set as a fireproof sealing ring to further improve the fireproof sealing performance between the valve body 3, and the number can be determined according to actual needs.

[0036] In the optional scheme of this embodiment, more preferably, each first valve seat 2 is provided with a first sealing surface 16 on the side close to the sphere 1, which can be sealingly fitted to the outer side of the sphere 1, so as to improve the sealing performance by fitting with the surface of the sphere 1.

[0037] In the optional scheme of this embodiment, more preferably, each first valve seat 2 is configured to be made of polytetrafluoroethylene material, which has good high temperature resistance and corrosion resistance.

[0038] In the optional scheme of this embodiment, it is more preferred that each clamping component 6 is configured as a spring, specifically a disc spring, which can provide a pre-tightening force along a ring shape.

[0039] Embodiment 2

[0040] This embodiment provides a floating ball valve, including a valve body 3, a ball 1 and a self-tightening valve seat as provided in the first embodiment. The ball 1 is movably arranged in the valve body 3, and the self-tightening valve seat is sealably arranged on the inlet side and the outlet side of the ball 1.

[0041] Among them, the ball 1 is driven to rotate by the switch assembly to realize the opening and closing of the ball valve. Specifically, the switch assembly adopts a conventional structure, mainly including a valve stem 17 and a handle 18 that are fixedly connected. One end of the valve stem 17 is fixedly connected to the ball 1. A packing 19 for sealing is arranged between the valve stem 17 and the valve body 3 and is fixed by a packing pressure plate 20. The handle 18 drives the valve stem 17 to rotate, thereby driving the ball 1 to rotate; the other structures of the switch assembly are conventional settings and will not be described in detail here.

[0042] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A self-tightening valve seat, characterized in that: It comprises two first valve seats (2) respectively arranged on the inlet side and the outlet side of the ball (1), the first valve seats (2) being used to seal against the outer side surface of the ball (1) and the inner wall surface of the valve body (3); each of the first valve seats (2) is provided with a fire valve seat (4) on the side facing away from the ball (1), the fire valve seat (4) and the first valve seat (2) both having a flow passage (5) communicating with a medium passage; and each of the fire valve seats (4) is provided with a clamping component (6) on the side facing away from the first valve seat (2), the clamping component (6) being used to be fixedly connected to the fire valve seat (4) and the inner wall of the valve body (3), the clamping component (6) being used to apply a pre-tightening force to the fire valve seat (4) in a direction close to the ball (1); The outer peripheral surface of each fire damper seat (4) is used for sealingly fitting to the inner wall surface of the valve body (3) and a side surface of the first valve seat (2); the first valve seat (2) has a first conical surface (7) and a second conical surface (8) arranged in an annular direction on the side surface opposite to the fire damper seat (4); the fire damper seat (4) has a third conical surface (9) and a fourth conical surface (10) arranged in an annular direction on the side surface opposite to the first valve seat (2); the first conical surface (7) and the third conical surface (9) can be sealingly fitted, and the second conical surface (8) and the fourth conical surface (10) can be sealingly fitted; and the inner end of the side surface of the fire damper seat (4) close to the sphere (1) is also provided with an arcuate sealing surface (11) matching the local shape of the outer side surface of the sphere (1).

2. The self-tightening valve seat according to claim 1, characterized in that: The side surface of the first valve seat (2) opposite to the fire damper seat (4) also has a first annular surface (12) arranged between the first conical surface (7) and the second conical surface (8); the side surface of the fire damper seat (4) opposite to the first valve seat (2) also has a second annular surface (13) arranged between the third conical surface (9) and the fourth conical surface (10); the first annular surface (12) and the second annular surface (13) can be sealed and fitted.

3. The self-tightening valve seat according to claim 1, characterized in that: The fire damper seat (4) is made of metal.

4. The self-tightening valve seat according to claim 1, characterized in that: At least one first sealing ring (14) is embedded on the outer peripheral surface of the first valve seat (2).

5. The self-tightening valve seat according to claim 1, characterized in that: At least one second sealing ring (15) is embedded on the outer peripheral surface of the fire damper seat (4).

6. The self-tightening valve seat according to claim 1, characterized in that: Each of the first valve seats (2) is provided with a first sealing surface (16) on the side close to the sphere (1) and capable of sealingly fitting against the outer side of the sphere (1).

7. The self-tightening valve seat according to claim 1, characterized in that: Each of the first valve seats (2) is made of polytetrafluoroethylene material.

8. The self-tightening valve seat according to claim 1, characterized in that: Each of the pressing components (6) is configured as a spring.

9. A floating ball valve, characterized in that: It comprises a valve body (3), a ball (1) and a self-tightening valve seat as claimed in any one of claims 1 to 8, wherein the ball (1) is movably arranged in the valve body (3), and the self-tightening valve seat is sealably arranged on the inlet side and the outlet side of the ball (1).

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