Valve seat for ball valve and ball valve

Abstract

The invention provides a valve seat for a ball valve and the ball valve, the valve seat is provided with an inner hole, the inner hole comprises a flow adjusting hole and a matching hole, a curved surface part is formed between the flow adjusting hole and the matching hole, the inner circumferential wall of the matching hole is provided with an annular protruding part locally protruding inwards, and a sealing ring is formed on the inner circumferential wall of the annular protruding part; the center of the spherical surface where the sealing ring is located and the center of the spherical surface where the curved surface portion is located are staggered in the axial direction. The flow adjusting hole is integrated in the valve seat, compared with the mode that a flow adjusting window is arranged on a valve element, the valve seat is easier to machine, when the valve seat is applied to the ball valve, an assembly flow disc does not need to be additionally arranged, cost is reduced, adjusting precision is high, and flow consistency is good; the spherical center of the spherical surface where the sealing ring is located and the spherical center of the spherical surface where the curved surface portion is located are staggered in the axial direction, when the valve element rotates to any position, the valve seat is always attached to the spherical surface of the valve element only through the sealing ring, the contact area of the valve seat and the valve element is smaller and constant, and torque needed when the valve element rotates is smaller and constant. And the rotation smoothness of the valve core is improved.

Description

Technical Field

[0001] The present application relates to the technical field of ball valves, and in particular to a valve seat for a ball valve and a ball valve. Background Art

[0002] Related technology ball valves are provided with a flow regulating window on the valve seat to play a flow regulating role, but during the rotation of the valve core, the contact area between the valve core and the valve seat will change with the position of the valve core, that is, the rotation resistance of the valve core will change, which may cause the valve core to rotate and jam. Summary of the invention

[0003] The purpose of the present application is to provide a valve seat and a ball valve for a ball valve, so as to solve the problem that the valve core may become stuck during rotation.

[0004] In order to solve the above technical problems, the present application provides a valve seat for a ball valve, wherein the valve seat has an axially through inner hole, the inner hole includes an axially connected flow regulating hole and a matching hole, a curved portion is formed between the flow regulating hole and the matching hole, the inner circumferential wall of the matching hole has an annular protrusion that partially protrudes inward, the inner circumferential wall of the annular protrusion forms a sealing ring, and the center of the spherical surface where the sealing ring is located and the center of the spherical surface where the curved portion is located are staggered along the axial direction.

[0005] In the present application, the flow regulating hole is integrated into the valve seat. The shape of the flow regulating hole can be designed according to the required flow characteristic curve, so that the flow regulating hole can be used to adjust the flow, that is, the valve seat also plays the role of a traditional distribution disk. When the valve seat is applied to a ball valve, there is no need to add a separate distribution disk. Compared with the solution of adding a separate distribution disk, the cost is lower, the adjustment accuracy is high, and the flow consistency is good. Compared with the flow regulating window set on the valve core, the flow regulating hole set on the valve seat is easier to process and improves the processing efficiency.

[0006] At the same time, in the present application, the inner peripheral wall of the matching hole has a partially inwardly protruding annular protrusion, and the inner peripheral wall of the annular protrusion forms a sealing ring. When the valve seat is applied to a ball valve, the sealing ring can be sealed with the spherical surface of the valve core to ensure the sealing performance of the ball valve and prevent leakage of the fluid medium. It can be understood that if the above annular protrusion is not provided, that is, the inner peripheral wall of the matching hole forms a sealing ring, the sealing ring formed by the inner peripheral wall of the annular protrusion in the present application is defined as the first sealing ring, and the sealing ring formed by the inner peripheral wall of the matching hole when the above annular protrusion is not provided is the second sealing ring. Obviously, the width of the second sealing ring is greater than the width of the first sealing ring. When the second sealing ring is sealed with the spherical surface of the valve core, the contact area between the valve seat and the valve core is larger, and the torque required for the valve core to rotate is larger. The driving component that drives the valve core to rotate needs to be specially designed to increase the output torque, resulting in a complex structure of the driving component and increased structural cost. In addition, the inner wall of the mating hole and the curved surface portion are on the same spherical surface. If the second sealing ring is in sealing fit with the spherical surface of the valve core, the valve core will have different contact areas with the curved surface portion when it rotates to different positions, resulting in the torque required for the valve core to rotate continuously. When the valve core rotates to a position with a larger contact area with the valve seat, the valve core may also become stuck.

[0007] In the present application, the inner circumferential wall of the matching hole has an annular protrusion that partially protrudes inward, and the inner circumferential wall of the annular protrusion forms a sealing ring. Obviously, the center of the spherical surface where the sealing ring is located and the center of the spherical surface where the curved surface is located are staggered axially. When the valve seat is applied to a ball valve, the valve core rotates to any position, and the valve seat is always only fitted with the spherical surface of the valve core through the sealing ring. The contact area between the valve seat and the valve core is smaller, the output torque of the driving component can be reduced, the structure of the driving component is simplified, and the structural cost is reduced. The contact area between the valve seat and the valve core is constant, and the torque required for the valve core to rotate is constant, which avoids the phenomenon of valve core jamming and improves the smoothness of the ball valve when switching between states.

[0008] In addition, it is understandable that after the ball valve is used for a long time, the contact area between the valve seat and the valve core will inevitably wear. If the above-mentioned annular protrusion is not provided, the valve seat is in sealing contact with the valve core through the second sealing ring. As the use time increases, the area of ​​the second sealing ring will increase, and the increase will be greater, resulting in a significant increase in the resistance of the valve core during rotation. When the output torque of the driving component remains unchanged, the valve core is prone to jamming. The present application provides an annular protrusion that partially protrudes inward on the inner circumferential wall of the matching hole. The annular protrusion can provide a certain wear allowance. Even if the annular protrusion is worn, the area of ​​the sealing ring changes little, and the resistance is basically constant when the valve core rotates, thereby avoiding the jamming of the valve core as much as possible and improving the smoothness of the ball valve when switching between states.

[0009] Optionally, in a plane perpendicular to the axis of the flow regulating hole, the projection of the flow regulating hole includes:

[0010] Two arc-shaped curves, the two arc-shaped curves are symmetrically arranged about a center line perpendicular to the valve core rotation axis, the two arc-shaped curves are convex in a direction approaching each other, and the two arc-shaped curves each have a first end close to the center line and a second end away from the center line;

[0011] A first major arc line, the first major arc line is symmetrically arranged about the center line, and the first major arc line smoothly connects the first ends of the two arc curves;

[0012] A second major arc line, wherein an opening of the second major arc line is opposite to an opening of the first major arc line, and the second major arc line smoothly connects the second ends of the two arc-shaped curves.

[0013] The present application also provides a ball valve, comprising:

[0014] Valve core;

[0015] Two valve seats, the valve core is arranged between the two valve seats, at least one of the aforementioned valve seats is used for a ball valve, and the sealing ring of the valve seat is in sealing contact with the spherical surface of the valve core.

[0016] The ball valve of the present application includes the aforementioned valve seat for the ball valve, so the ball valve of the present application has the same technical effect as the aforementioned valve seat, which will not be described in detail here.

[0017] Optionally, the ball valve further comprises:

[0018] A valve body, wherein the valve core and the valve seat are both arranged inside the valve body;

[0019] A limiting portion is provided, wherein the limiting portion is connected to the valve seat and the valve body along a circumferential limiting direction.

[0020] Optionally, the end wall of the valve seat facing away from the valve core is provided with a first limit hole extending along the axial direction, and the valve body is provided with a second limit hole extending along the axial direction, the first limit hole and the second limit hole are correspondingly connected, and the limit part includes a limit pin, and the limit pin is inserted into the corresponding first limit hole and the second limit hole.

[0021] Optionally, the limiting portion includes a support, the valve body and the support are connected in a circumferential limiting manner, and the valve seat and the support are connected in a circumferential limiting manner.

[0022] Optionally, the valve body has an annular portion inside, and the annular portion extends axially in a direction close to the valve seat;

[0023] The support includes a first connecting portion, which is sleeved on the ring portion. The first of the first connecting portion and the ring portion has a limiting notch, which passes through the end wall of the free end of the first portion. The second portion has a first limiting protrusion extending radially, which is inserted into the corresponding limiting notch and limited circumferentially.

[0024] Optionally, the end of the first connecting portion close to the valve seat has a folded portion folded radially outward, the folded portion abuts against the end wall of the valve seat facing away from the valve core, the folded portion is connected to a second limiting protrusion, the second limiting protrusion extends axially toward the valve seat, the end wall of the valve seat facing away from the valve core is provided with a first limiting hole extending axially, the second limiting protrusion is inserted into the first limiting hole and limited circumferentially.

[0025] Optionally, the ball valve further comprises an elastic component, which is arranged axially, one axial end of the elastic component abuts against the valve body, the other axial end of the elastic component directly or indirectly abuts against the valve seat, and the elastic component is in an energy storage state.

[0026] Optionally, the ball valve further comprises a stopper, the stopper is located on a side of the valve seat close to the valve core, the stopper is fixed to the valve body, and a gap is provided between the stopper and an opposite end wall of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of a specific embodiment of a valve seat for a ball valve provided in this application;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure of the second valve seat angle for a ball valve;

[0029] Figure 3 for Figure 2 Cross-sectional view along AA direction;

[0030] Figure 4 for Figure 2 Cross-sectional view along direction BB;

[0031] Figure 5 This is a schematic diagram of the partial structure of a specific embodiment of the ball valve provided in the present application in a valve closing state;

[0032] Figure 6 for Figure 5 Schematic diagram of the partial structure of the ball valve in the open state;

[0033] Figure 7 for Figure 5 Schematic diagram of the structure of the support in the ball valve;

[0034] in, Figure 1-Figure 7 The reference numerals in the figures are as follows:

[0035] 1-valve seat; 1a-inner hole; 1a1-flow regulating hole; 1a2-matching hole; 11-curved portion; 12-annular raised portion; 12A-sealing ring; L1-arc curve; C-center line; S1-first superior arc line; S2-second superior arc line; 1b-first limiting hole; 1c-annular groove;

[0036] 2-valve core;

[0037] 3-valve body; 31-ring;

[0038] 4-support; 41-first connecting portion; 42-folding portion;

[0039] 5- stopper;

[0040] 6- elastic member;

[0041] 7- Sealing ring;

[0042] a-limiting notch; b1-first limiting protrusion; b2-second limiting protrusion. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] In this article, the arrangement direction of the valve core 2 and the valve seat 1 is defined as the axial direction.

[0045] Herein, a direction closer to the inner portion of the valve seat 1 in the radial direction is defined as “inner”.

[0046] Please refer to Figure 1-Figure 4 , Figure 1 A schematic structural diagram of a specific embodiment of a valve seat for a ball valve provided in this application; Figure 2 for Figure 1 A schematic diagram of the structure of the second valve seat angle for a ball valve; Figure 3 for Figure 2 Cross-sectional view along AA direction; Figure 4 for Figure 2 Cross-sectional view along direction BB.

[0047] The present embodiment provides a valve seat for a ball valve, wherein the valve seat 1 has an axially through inner hole 1a, the inner hole 1a includes an axially connected flow regulating hole 1a1 and a matching hole 1a2, a curved portion 11 is formed between the flow regulating hole 1a1 and the matching hole 1a2, the inner circumferential wall of the matching hole 1a2 has an annular protrusion 12 which partially protrudes inward, the inner circumferential wall of the annular protrusion 12 forms a sealing ring 12A, and the center of the spherical surface where the sealing ring 12A is located and the center of the spherical surface where the curved portion 11 is located are staggered along the axial direction.

[0048] In this embodiment, the flow regulating hole 1a1 is integrated into the valve seat 1. The shape of the flow regulating hole 1a1 can be designed according to the required flow characteristic curve, so that the flow regulating hole 1a1 can be used to adjust the flow, that is, the valve seat 1 also plays the role of a traditional distribution disk. When the valve seat 1 is applied to a ball valve, there is no need to add a separate distribution disk. Compared with the solution that requires a separate distribution disk, this embodiment has higher adjustment accuracy, good flow consistency, and is conducive to reducing costs. Compared with the flow regulating window set on the valve core, the flow regulating hole 1a1 set on the valve seat 1 is easier to process and improves processing efficiency.

[0049] At the same time, in this embodiment, the inner peripheral wall of the matching hole 1a2 has a partially inwardly protruding annular protrusion 12, and the inner peripheral wall of the annular protrusion 12 forms a sealing ring 12A. When the valve seat 1 is applied to a ball valve, the sealing ring 12A can be sealed with the spherical surface of the valve core to ensure the sealing performance of the ball valve and prevent leakage of the fluid medium. It can be understood that if the above annular protrusion 12 is not provided, that is, the inner peripheral wall of the matching hole 1a2 forms a sealing ring, the sealing ring 12A formed by the inner peripheral wall of the annular protrusion 12 in this embodiment is defined as the first sealing ring, and the sealing ring formed by the inner peripheral wall of the matching hole 1a2 when the above annular protrusion 12 is not provided is the second sealing ring. Obviously, the width of the second sealing ring is greater than the width of the first sealing ring. When the second sealing ring is sealed with the spherical surface of the valve core, the contact area between the valve seat 1 and the valve core is larger, and the torque required for the valve core to rotate is larger. The driving component that drives the valve core to rotate needs to be specially designed to increase the output torque, resulting in a complex structure of the driving component and increased structural cost. In addition, the inner wall of the matching hole 1a2 and the curved portion 11 are on the same spherical surface. If the second sealing ring is in sealing fit with the spherical surface of the valve core, the valve core will have different contact areas with the curved portion 11 when it rotates to different positions, resulting in the torque required for the valve core to rotate continuously. When the valve core rotates to a position with a larger contact area with the valve seat 1, the valve core may also become stuck.

[0050] In the present application, the inner wall of the matching hole 1a2 has an annular protrusion 12 that partially protrudes inward, and the inner wall of the annular protrusion 12 forms a sealing ring 12A. Obviously, the center of the spherical surface where the sealing ring 12A is located and the center of the spherical surface where the curved portion 11 is located are axially staggered. When the valve seat 1 is applied to a ball valve, the valve core rotates to any position, and the valve seat is always only fitted with the spherical surface of the valve core through the sealing ring 12A. The contact area between the valve seat 1 and the valve core is smaller, the output torque of the driving component can be reduced, the structure of the driving component can be simplified, and the structural cost can be reduced. The contact area between the valve seat 1 and the valve core is constant, and the torque required for the valve core to rotate is constant, which avoids the phenomenon of the valve core being stuck and improves the smoothness of the ball valve when switching between states.

[0051] In addition, it can be understood that after the ball valve is used for a long time, the contact area between the valve seat 1 and the valve core will inevitably wear. If the above-mentioned annular protrusion 12 is not provided, the valve seat is in sealing contact with the valve core through the second sealing ring. As the use time increases, the area of ​​the second sealing ring will increase, and the increase will be greater, resulting in a significant increase in the resistance of the valve core during rotation. When the output torque of the driving component remains unchanged, the valve core is prone to jamming. In this embodiment, an annular protrusion 12 that partially protrudes inward is provided on the inner circumferential wall of the matching hole 1a2. The annular protrusion 12 can provide a certain wear allowance. Even if the annular protrusion 12 is worn, the area of ​​the sealing ring 12A changes little, the resistance of the valve core is basically constant when the valve core rotates, and the output torque required by the driving component is basically constant, thereby reducing the possibility of the valve core getting stuck during rotation and improving the smoothness of the ball valve during state switching.

[0052] In some preferred embodiments of the present application, the annular protrusion 12 is set to have a uniform width along the thickness direction of the annular protrusion 12. In this way, even if the annular protrusion 12 is worn over time, the area of ​​the sealing ring 12A does not change, so that the resistance of the valve core during rotation does not change, and the output torque required by the driving component does not change, further reducing the possibility of the valve core being stuck during rotation and further improving the smoothness of the ball valve during state switching.

[0053] like Figure 2 As shown, in a plane perpendicular to the axis of the flow regulating hole 1a1, the projection of the flow regulating hole 1a1 includes:

[0054] Two arc curves L1, the two arc curves L1 are symmetrically arranged about a center line C perpendicular to the valve core rotation axis, the two arc curves L1 are convex in a direction approaching each other, and the two arc curves L1 both have a first end close to the center line C and a second end away from the center line C;

[0055] The first major arc line S1, the first major arc line S1 is symmetrically arranged about the center line C, and the first major arc line S1 smoothly connects the first ends of the two arc curves L1;

[0056] The second major arc line S2, the opening of the second major arc line S2 is opposite to the opening of the first major arc line S1, and the second major arc line S2 smoothly connects the second ends of the two arc curves L1.

[0057] When the ball valve using the valve seat 1 is opened, the valve core rotates from the side where the first optimal arc S1 is located to the side where the second optimal arc S2 is located. When the opening of the valve core is small, the flow area increases slowly as the opening increases. When the opening of the valve core is large, the flow area increases quickly as the opening increases, making it easy for the ball valve to achieve an equal percentage characteristic with higher adjustment accuracy.

[0058] In this embodiment, the material of the valve seat 1 includes but is not limited to polytetrafluoroethylene. Polytetrafluoroethylene has the characteristic of being resistant to fluid erosion, which is beneficial to increasing the service life of the valve seat 1.

[0059] Please refer to Figure 5-Figure 6 , Figure 5 This is a schematic diagram of the partial structure of a specific embodiment of the ball valve provided in the present application in a valve closing state; Figure 6 for Figure 5 Schematic diagram of the partial structure of the ball valve in the open state.

[0060] This embodiment also provides a ball valve, including:

[0061] Valve core 2;

[0062] There are two valve seats, and the valve core 2 is arranged between the two valve seats. At least one of the valve seats 1 is the aforementioned valve seat 1 for a ball valve. The sealing ring 12A of the valve seat 1 and the spherical surface of the valve core 2 are sealed and fitted.

[0063] The ball valve of this embodiment includes the aforementioned valve seat 1 for a ball valve, so the ball valve of this embodiment has the same technical effect as the aforementioned valve seat 1, which will not be described in detail herein.

[0064] When one of the valve seats is the aforementioned valve seat 1 , the valve seat 1 may be disposed on the inlet side of the valve core 2 or on the outlet side of the valve core 2 .

[0065] Furthermore, in this embodiment, the ball valve further includes:

[0066] The valve body 3, the valve core 2 and the valve seat 1 are all arranged inside the valve body 3;

[0067] The limiting part connects the valve seat 1 and the valve body 3 along the circumferential direction.

[0068] As configured above, the limit portion serves to limit the valve seat 1 and the valve body 3 along the circumferential direction, thereby preventing the valve seat 1 from shifting in the circumferential direction during use, thereby ensuring that when the valve is opened, the valve core 2 always rotates from the position opposite to the first optimal arc S1 to the side close to the second optimal arc S2, ensuring that the ball valve always has a preset flow characteristic curve, thereby improving the adjustment accuracy and flow consistency of the ball valve in this embodiment.

[0069] In some embodiments of the present application, the end wall of the valve seat 1 facing away from the valve core 2 is provided with a first limiting hole 1b extending along the axial direction, and the valve body 3 is provided with a second limiting hole extending along the axial direction. The first limiting hole 1b and the second limiting hole are correspondingly connected, and the limiting part includes a limiting pin, which is inserted into the corresponding first limiting hole 1b and the second limiting hole.

[0070] As configured above, this embodiment adopts a limit pin as a circumferential limit structure. When the limit pin is inserted into the corresponding first limit hole 1b and the second limit hole at the same time, it plays a role in circumferentially limiting the valve seat 1 and the valve body 3. The limit is reliable, the structure is simple, and the cost is reduced.

[0071] Among them, the number of the first limit hole 1b, the second limit hole and the limit pin is not limited, as long as the circumferential limitation of the valve seat 1 and the valve body 3 can be achieved, the number of the first limit hole 1b, the second limit hole and the limit pin is preferably more than two. For example, in some embodiments of the present application, the number of the first limit hole 1b, the second limit hole and the limit pin is two, the two first limit holes 1b are radially arranged opposite to each other, and the two second limit holes are radially arranged opposite to each other. The limit pin is inserted into the corresponding first limit hole 1b and the second limit hole. The first limit hole 1b and the second limit hole are circular holes, and the limit pin is a cylindrical structure.

[0072] Please refer to Figure 5-Figure 7 , Figure 7 for Figure 5 Schematic diagram of the structure of the support in the ball valve.

[0073] In this embodiment, the limiting part includes a support 4, the valve body 3 and the support 4 are connected in a circumferential limiting manner, and the valve seat 1 and the support 4 are connected in a circumferential limiting manner. In this way, the support 4 plays a role in limiting the circumferential position of the valve seat 1 and the valve body 3 in this embodiment.

[0074] The valve body 3 has a ring portion 31 inside, and the ring portion 31 extends axially toward the valve seat 1;

[0075] The support 4 includes a first connecting portion 41, which is inserted into the ring portion 31. The ring portion 31 has a limiting notch a, which passes through the end wall of the free end of the ring portion 31. The first connecting portion 41 has a first limiting protrusion b1 extending radially. The first limiting protrusion b1 is inserted into the corresponding limiting notch a and limits the position along the circumferential direction.

[0076] As described above, the support 4 can be installed on the valve body 3 by inserting the first connection part 41 into the ring part 31; the first limiting protrusion b1 is inserted into the corresponding limiting notch a, which can play a circumferential limiting role for the support 4 and the valve body 3, and prevent the support 4 from circumferentially deflecting relative to the valve body 3. At the same time, in this embodiment, the support 4 and the valve body 3 are movable in the axial direction, and the ring part 31 can also play a guiding role for the first connection part 41, so that the first connection part 41 and the valve seat 1 can only move in the extension direction of the ring part 31, that is, in the axial direction, under the action of external force, to ensure the position accuracy of the valve seat 1.

[0077] In order to ensure reliable circumferential limiting of the support 4 and the valve body 3, the circumferential width of the first limiting protrusion b1 should not be less than the circumferential width of the limiting notch a.

[0078] In some other embodiments of the present application, the first connecting portion 41 has a limiting notch a, which passes through the end wall of the free end of the first connecting portion 41, and the ring portion 31 has a first limiting protrusion b1 extending radially, which is inserted into the corresponding limiting notch a.

[0079] In short, the first connection portion 41 and the ring portion 31 have a limiting notch a that passes through the end wall of the free end of the first connection portion, and the second connection portion has a first limiting protrusion b1 that extends radially and is inserted into the corresponding limiting notch a.

[0080] Furthermore, in the present embodiment, one end of the first connecting portion 41 close to the valve seat 1 has a folded portion 42 folded radially outward, the folded portion 42 abuts against the end wall of the valve seat 1 facing away from the valve core 2, the folded portion 42 is connected to a second limiting protrusion b2, the second limiting protrusion b2 extends axially in a direction close to the valve seat 1, the end wall of the valve seat 1 facing away from the valve core 2 is provided with a first limiting hole 1b extending axially, the second limiting protrusion b2 is inserted in the first limiting hole 1b and is limited circumferentially.

[0081] In this way, the folded portion 42 abuts against the end wall of the valve seat 1 facing away from the valve core 2, which makes it easy for the support 4 and the valve seat 1 to move axially together under the action of the elastic component 6 (described in detail later); by inserting the second limiting protrusion b2 into the first limiting hole 1b, it can play a circumferential limiting role for the support 4 and the valve seat 1, avoid circumferential deflection of the valve seat 1, and improve the position accuracy of the valve seat 1.

[0082] In this embodiment, the support 4 and the valve body 3 are movable in the axial direction, and the support 4 and the valve seat 1 are movable in the axial direction. In some embodiments of the present application, the support 4 and the valve body 3 are movable in the axial direction, and the support 4 and the valve seat 1 are fixedly connected. In this case, there is no need to set the second limiting protrusion b2 and the first limiting hole 1b to limit the circumferential direction of the support 4 and the valve seat 1.

[0083] In some other embodiments of the present application, the support 4 and the valve body 3 are fixedly connected, and it is also feasible that the support 4 and the valve seat 1 are movable along the axial direction, such as by fixing the sleeve ring portion 31 with the first connecting portion 41 to achieve a fixed connection between the support 4 and the valve body 3. In this case, there is no need to set the first limiting protrusion b1 and the limiting notch a, and the folding portion 42 should be provided with an avoidance notch so that the elastic component 6 directly abuts against the end wall of the valve seat 1 facing away from the valve core 2, so that the valve seat 1 can move axially relative to the support 4 under the action of the elastic component 6.

[0084] In order to ensure reliable circumferential limiting of the support 4 and the valve seat 1, the circumferential width of the second limiting protrusion b2 should not be less than the circumferential width of the first limiting hole 1b.

[0085] Please continue to refer to Figure 5 and Figure 6 In this embodiment, the ball valve also includes an elastic component 6, which is arranged axially, one axial end of the elastic component 6 abuts against the valve body 3, and the other axial end of the elastic component 6 directly or indirectly abuts against the valve seat 1, and the elastic component 6 is in an energy storage state.

[0086] In this way, the elastic component 6 can provide a certain clamping force for the valve seat 1, so that the sealing ring 12A always fits reliably with the spherical surface of the valve core 2, thereby improving the sealing effect. Of course, the clamping force cannot be too large, so as to avoid excessive resistance during the rotation of the valve core 2, which may cause the rotation of the valve core 2 to become stuck, and ensure the smooth rotation of the valve core 2.

[0087] like Figure 5 and Figure 6 As shown, in this embodiment, the folded portion 42 abuts against the end wall of the valve seat 1 facing away from the valve core 2, and the elastic component 6 abuts against the end wall of the folded portion 42 facing away from the valve core 2, that is, in this embodiment, the elastic component 6 indirectly abuts against the valve seat 1, and under the action of the elastic component 6, the support 4 and the valve seat 1 move axially together.

[0088] As mentioned above, in some embodiments of the present application, the ball valve is not provided with a support 4, and a limit pin is used as a circumferential limit structure of the valve seat 1 and the valve body 3. At this time, the elastic component 6 directly abuts against the end wall of the valve seat 1 facing away from the valve core 2.

[0089] In this embodiment, the elastic component 6 is in the form of a spiral spring. In practice, the elastic component 6 can also be a rubber spring or the like.

[0090] Please continue to refer to Figure 5 and Figure 6 In this embodiment, the ball valve further includes a stopper 5 , which is located on a side of the valve seat 1 close to the valve core 2 , and is fixed to the valve body 3 , with a gap between the stopper 5 and the opposite end wall of the valve seat 1 .

[0091] It can be understood that when the flow rate of the fluid medium flowing through the ball valve is large, the fluid medium will generate a large pressure on the valve seat 1. As mentioned above, the valve seat 1 is usually made of non-metallic materials such as polytetrafluoroethylene. Therefore, the valve seat 1 may be deformed under the action of the fluid pressure. If the deformation of the valve seat 1 is too large, on the one hand, the valve seat 1 may be partially squeezed between the valve core 2 and the valve body 3, causing the rotation resistance of the valve core 2 to increase, resulting in the valve core 2 being stuck or even stuck; on the other hand, it may cause the sealing between the valve seat 1 and the valve body 3 to decrease, resulting in the problem of internal leakage of the ball valve. Based on this, the ball valve of this embodiment is additionally provided with a stopper 5, which can limit the deformation of the valve seat 1. On the one hand, it prevents the valve seat 1 from being squeezed into the valve core 2 and the valve body 3 as much as possible, avoids the increase of the rotation resistance of the valve core 2 as much as possible, and reduces the possibility of the valve core 2 being stuck or even stuck; on the other hand, it avoids the reduction of the sealing between the valve seat 1 and the valve body 3 as much as possible, and reduces the possibility of internal leakage of the ball valve.

[0092] In addition, as the annular protrusion 12 wears, the valve seat 1 will move toward the direction close to the valve core 2 under the driving force of the elastic component 6. Therefore, there is a gap between the blocking portion 5 and the relative end walls of the valve seat 1. The gap is used to provide a moving space for the valve seat 1 to avoid interference with the movement of the valve seat 1. The axial width of the gap should not be less than the axial width of the annular protrusion 12.

[0093] like Figure 1 , Figure 5 and Figure 6 As shown, in this embodiment, the outer peripheral wall of the valve seat 1 is provided with an annular groove 1c, and the ball valve in this embodiment also includes a sealing ring 7, which is installed inside the annular groove 1c, and the inner peripheral wall of the sealing ring 7 abuts against the bottom wall of the annular groove 1c, and the outer peripheral wall of the sealing ring 7 abuts against the inner peripheral wall of the valve body 3, thereby realizing circumferential sealing between the valve seat 1 and the valve body 3.

[0094] It can be seen that the annular groove 1c can accommodate and limit the sealing ring 7, improve the installation position accuracy of the sealing ring 7, ensure that the sealing ring 7 can reliably perform the sealing function, and avoid internal leakage of the ball valve.

[0095] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A valve seat for a ball valve, characterized in that: The valve seat (1) has an axially through inner hole (1a), the inner hole (1a) includes an axially connected flow regulating hole (1a1) and a matching hole (1a2), a curved portion (11) is formed between the flow regulating hole (1a1) and the matching hole (1a2), the inner peripheral wall of the matching hole (1a2) has an annular protrusion (12) that partially protrudes inward, the inner peripheral wall of the annular protrusion (12) forms a sealing ring (12A), and the center of the spherical surface where the sealing ring (12A) is located and the center of the spherical surface where the curved portion (11) is located are axially offset.

2. The valve seat for a ball valve according to claim 1, characterized in that: In a plane perpendicular to the axis of the flow regulating hole (1a1), the projection of the flow regulating hole (1a1) includes: Two arc curves (L1), the two arc curves (L1) are symmetrically arranged about a center line (C) perpendicular to the valve core rotation axis, the two arc curves (L1) are convex in a direction approaching each other, and the two arc curves (L1) both have a first end close to the center line (C) and a second end away from the center line (C); a first major arc line (S1), the first major arc line (S1) being symmetrically arranged about the center line (C), the first major arc line (S1) smoothly connecting first ends of the two arc-shaped curves (L1); A second major arc line (S2), the opening of the second major arc line (S2) is opposite to the opening of the first major arc line (S1), and the second major arc line (S2) smoothly connects the second ends of the two arc curves (L1).

3. A ball valve, characterized in that: include: Valve core (2); Two valve seats, the valve core (2) is arranged between the two valve seats, at least one of the valve seats (1) is the valve seat (1) for a ball valve according to claim 1 or 2, and the sealing ring (12A) of the valve seat (1) is in sealing contact with the spherical surface of the valve core (2).

4. The ball valve according to claim 3, characterized in that: The ball valve also includes: A valve body (3), wherein the valve core (2) and the valve seat (1) are both arranged inside the valve body (3); A limiting portion, the limiting portion connecting the valve seat (1) and the valve body (3) in a circumferentially limiting manner.

5. The ball valve according to claim 4, characterized in that: The end wall of the valve seat (1) facing away from the valve core (2) is provided with a first limiting hole (1b) extending in the axial direction, and the valve body (3) is provided with a second limiting hole extending in the axial direction, the first limiting hole (1b) and the second limiting hole are correspondingly connected, and the limiting part comprises a limiting pin, and the limiting pin is inserted into the corresponding first limiting hole (1b) and the second limiting hole.

6. The ball valve according to claim 4, characterized in that: The limiting portion comprises a support (4), the valve body (3) and the support (4) are connected in a circumferential limiting manner, and the valve seat (1) and the support (4) are connected in a circumferential limiting manner.

7. The ball valve according to claim 6, characterized in that: The valve body (3) has an annular portion (31) inside, and the annular portion (31) extends axially in a direction close to the valve seat (1); The support (4) comprises a first connecting portion (41), the first connecting portion (41) being sleeved on the ring portion (31), the first of the first connecting portion (41) and the ring portion (31) having a limiting notch (a), the limiting notch (a) penetrating the end wall of the free end of the first, and the second having a first limiting protrusion (b1) extending in the radial direction, the first limiting protrusion (b1) being inserted into the corresponding limiting notch (a) and limiting in the circumferential direction.

8. The ball valve according to claim 7, characterized in that: The first connecting portion (41) has an end close to the valve seat (1) with a folded portion (42) folded outwardly in the radial direction, the folded portion (42) abuts against the end wall of the valve seat (1) facing away from the valve core (2), the folded portion (42) is connected to a second limiting protrusion (b2), the second limiting protrusion (b2) extends axially in a direction close to the valve seat (1), the end wall of the valve seat (1) facing away from the valve core (2) is provided with a first limiting hole (1b) extending in the axial direction, the second limiting protrusion (b2) is inserted into the first limiting hole (1b) and limits the position in the circumferential direction.

9. The ball valve according to any one of claims 4 to 8, characterized in that: The ball valve further comprises an elastic component (6), wherein the elastic component (6) is arranged along the axial direction, one axial end of the elastic component (6) abuts against the valve body (3), and the other axial end of the elastic component (6) directly or indirectly abuts against the valve seat (1), and the elastic component (6) is in an energy storage state.

10. The ball valve according to any one of claims 4 to 8, characterized in that: The ball valve further comprises a stopper (5), the stopper (5) being located on a side of the valve seat (1) close to the valve core (2), the stopper (5) being fixed to the valve body (3), and a gap being provided between the stopper (5) and the opposite end wall of the valve seat (1).

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