Valve seat for ball valve and ball valve

Abstract

The utility model 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] This application relates to the field of ball valve technology, and specifically to a valve seat and a ball valve for use in a ball valve. Background Technology

[0002] The ball valve has a flow regulation window on the valve seat to regulate the flow. However, 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 get stuck during rotation. Utility Model Content

[0003] The purpose of this application is to provide a valve seat and a ball valve for a ball valve, which solves the problem of potential rotational jamming of the valve core.

[0004] To solve the above-mentioned technical problems, this application provides a valve seat for a ball valve, the valve seat having an axially penetrating inner hole, the inner hole including an axially connected flow regulating hole and a mating hole, a curved surface being formed between the flow regulating hole and the mating hole, the inner peripheral wall of the mating hole having a partially inwardly protruding annular protrusion, the inner peripheral wall of the annular protrusion forming a sealing ring, 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 being axially offset.

[0005] This application integrates the flow regulating orifice into the valve seat. The shape of the flow regulating orifice can be designed according to the required flow characteristic curve, so that the flow regulating orifice can be used to regulate the flow. That is, the valve seat also plays the role of a traditional distribution plate. When this valve seat is applied to a ball valve, there is no need to add a separate distribution plate. Compared with the solution of adding a separate distribution plate, the cost is lower, the regulation accuracy is higher, and the flow consistency is better. Compared with the flow regulating window being set in the valve core, the flow regulating orifice being set in the valve seat is easier to process and improves the processing efficiency.

[0006] Meanwhile, in this application, the inner peripheral wall of the mating hole has a partially inwardly protruding annular protrusion. The inner peripheral wall of the annular protrusion forms a sealing ring. When the valve seat is applied to a ball valve, this sealing ring can seal and fit tightly against the spherical surface of the valve core, ensuring the sealing performance of the ball valve and preventing fluid leakage. It can be understood that if the annular protrusion is not provided, i.e., the inner peripheral wall of the mating hole forms a sealing ring, the sealing ring formed by the inner peripheral wall of the annular protrusion in this application is defined as the first sealing ring, and the sealing ring formed by the inner peripheral wall of the mating hole without the annular protrusion is defined as the second sealing ring. Obviously, the width of the second sealing ring is greater than the width of the first sealing ring. Therefore, when the second sealing ring seals and fits tightly against 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 greater. The drive 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 drive component and increased structural cost. Furthermore, since the inner circumferential wall and curved surface of the mating hole are on the same spherical surface, if the second sealing ring is in close contact with the spherical surface of the valve core, the valve core will have different contact areas with the curved surface when rotating to different positions, causing the torque required by the valve core to change continuously when rotating. When the valve core rotates to a position with a larger contact area with the valve seat, the valve core may also experience jamming.

[0007] In this application, the inner peripheral wall of the mating hole has a locally inwardly protruding annular protrusion. The inner peripheral 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 offset along the axial direction. When the valve seat is applied to the ball valve, the valve core rotates to any position, and the valve seat always only contacts 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 drive component can be reduced, the structure of the drive component is simplified, and the structural cost is reduced. Moreover, the contact area between the valve seat and the valve core is constant, and the torque required by the valve core during rotation is constant, avoiding the phenomenon of valve core jamming and improving the smoothness of the ball valve when switching states.

[0008] Furthermore, it is understandable that after prolonged use of a ball valve, wear is inevitable at the contact points between the valve seat and the valve core. Without the aforementioned annular protrusion, the valve seat seals against the valve core via the second sealing ring. As usage time increases, the area of ​​the second sealing ring expands significantly, leading to a substantial increase in resistance during valve core rotation. With the output torque of the drive component remaining constant, the valve core is prone to jamming. In contrast, this application provides a partially inwardly protruding annular protrusion on the inner circumferential wall of the mating hole. This annular protrusion provides a certain wear allowance. Even if the annular protrusion wears, the area of ​​the sealing ring changes little, and the resistance during valve core rotation remains essentially constant, minimizing the risk of valve core jamming and improving the smoothness of ball valve switching.

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

[0010] Two arc-shaped curves are symmetrically arranged about a center line perpendicular to the valve core axis. The two arc-shaped curves bulge towards each other. Each arc-shaped curve has a first end close to the center line and a second end far from the center line.

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

[0012] The second superior arc line has an opening opposite to the opening of the first superior arc line, and the second superior arc line smoothly connects the second ends of the two arc curves.

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

[0014] Valve core;

[0015] Two valve seats, with the valve core disposed between the two valve seats, at least one of which is a valve seat for a ball valve, wherein the sealing ring of the valve seat and the spherical surface of the valve core are in sealed contact.

[0016] The ball valve of this application includes the aforementioned valve seat for a ball valve, and therefore the ball valve of this application has the same technical effect as the aforementioned valve seat, which will not be repeated here.

[0017] Optionally, the ball valve further includes:

[0018] The valve body, the valve core and the valve seat are both disposed inside the valve body;

[0019] A limiting part, which limits and connects the valve seat and the valve body in the circumferential direction.

[0020] Optionally, the valve seat has a first limiting hole extending axially on the end wall opposite to the valve core, and the valve body has a second limiting hole extending axially. The first limiting hole and the second limiting hole are connected to each other. The limiting part includes a limiting pin, which is inserted into the corresponding first limiting hole and second limiting hole.

[0021] Optionally, the limiting part includes a support, the valve body and the support are circumferentially limited and connected, and the valve seat and the support are circumferentially limited and connected.

[0022] Optionally, the valve body has an internal ring that extends axially toward the valve seat;

[0023] The support includes a first connecting portion, which is fitted onto the ring portion. The first of the first connecting portion and the ring portion has a limiting notch that penetrates 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 circumferentially limited.

[0024] Optionally, the first connecting portion has a folded portion that folds outward in a radial direction at one end near the valve seat. The folded portion abuts against the end wall of the valve seat opposite to 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 opposite to the valve core is provided with a first limiting hole that extends axially. The second limiting protrusion is inserted into the first limiting hole and is circumferentially limited.

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

[0026] Optionally, the ball valve further includes a stop located on the side of the valve seat near the valve core, the stop being fixed to the valve body, and a gap between the stop and the opposite end walls of the valve seat. Attached Figure Description

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

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

[0029] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0030] Figure 4 for Figure 2 A cross-sectional view along the BB direction;

[0031] Figure 5 A partial structural diagram of a specific embodiment of the ball valve provided in this application in the closed state;

[0032] Figure 6 for Figure 5 A partial structural diagram of a ball valve in the open state;

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

[0034] in, Figures 1-7 The accompanying figure labels are as follows:

[0035] 1-Valve seat; 1a-Inner hole; 1a1-Flow regulating hole; 1a2-Matching hole; 11-Curved surface; 12-Annular protrusion; 12A-Sealing ring; L1-Arc-shaped curve; C-Center line; S1-First superior arc; S2-Second superior arc; 1b-First limiting hole; 1c-Annular groove;

[0036] 2-Valve core;

[0037] 3-Valve body; 31-Ring portion;

[0038] 4-Support; 41-First connecting part; 42-Folding part;

[0039] 5-Block;

[0040] 6-Elastic components;

[0041] 7-Sealing ring;

[0042] a - Limiting notch; b1 - First limiting protrusion; b2 - Second limiting protrusion. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

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

[0045] In this article, the direction along the radial direction closer to the interior of valve seat 1 is defined as "inner".

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

[0047] This embodiment provides a valve seat for a ball valve. The valve seat 1 has an axially penetrating inner hole 1a. The inner hole 1a includes an axially connected flow regulating hole 1a1 and a mating hole 1a2. A curved surface 11 is formed between the flow regulating hole 1a1 and the mating hole 1a2. The inner peripheral wall of the mating hole 1a2 has a partially inwardly protruding annular protrusion 12. The inner peripheral wall of the annular protrusion 12 forms a sealing ring 12A. The center of the spherical surface where the sealing ring 12A is located and the center of the spherical surface where the curved surface 11 is located are axially offset.

[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 the flow regulating hole 1a1 can be used to regulate the flow. That is, the valve seat 1 also plays the role of a traditional distribution plate. When the valve seat 1 is applied to a ball valve, there is no need to add a separate distribution plate. Compared with the solution that requires a separate distribution plate, this embodiment has higher regulation accuracy, better flow consistency, and helps to reduce costs. Compared with the flow regulating window being set in the valve core, the flow regulating hole 1a1 being set in the valve seat 1 is easier to process and improves processing efficiency.

[0049] Meanwhile, in this embodiment, the inner peripheral wall of the mating hole 1a2 has a partially inwardly protruding annular protrusion 12. 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, this sealing ring 12A can seal and fit with the spherical surface of the valve core, ensuring the sealing performance of the ball valve and preventing fluid medium leakage. It can be understood that if the annular protrusion 12 is not provided, that is, the inner peripheral wall of the mating 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 mating hole 1a2 without the annular protrusion 12 is defined as the second sealing ring. Obviously, the width of the second sealing ring is larger than the width of the first sealing ring. When the second sealing ring seals and fits 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 greater. The drive 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 drive component and increased structural cost. Furthermore, since the inner circumferential wall of the mating hole 1a2 and the curved surface 11 are on the same spherical surface, if the second sealing ring is in close contact with the spherical surface of the valve core, the valve core will have different contact areas with the curved surface 11 when it rotates to different positions, causing the torque required by the valve core to change continuously when it rotates. When the valve core rotates to a position with a larger contact area with the valve seat 1, the valve core may also experience jamming.

[0050] In this application, the inner peripheral wall of the mating hole 1a2 has a locally inwardly protruding annular protrusion 12, and the inner peripheral 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 surface 11 is located are axially offset. When the valve seat 1 is applied to the ball valve, the valve core rotates to any position, and the valve seat always only contacts 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 drive component can be reduced, the structure of the drive component is simplified, and the structural cost is reduced. Moreover, the contact area between the valve seat 1 and the valve core is constant, and the torque required by the valve core during rotation is constant, avoiding the phenomenon of valve core jamming and improving the smoothness of the ball valve when switching states.

[0051] Furthermore, it is understandable that after prolonged use of the ball valve, wear will inevitably occur at the contact points between the valve seat 1 and the valve core. If the annular protrusion 12 is not provided, the valve seat will seal against the valve core through the second sealing ring. As the usage time increases, the area of ​​the second sealing ring will increase, and the increase will be even greater, resulting in a significant increase in resistance when the valve core rotates. If the output torque of the drive component remains unchanged, the valve core is prone to jamming. In this embodiment, an annular protrusion 12 that protrudes inward is provided on the inner circumferential wall of the mating hole 1a2. The annular protrusion 12 can provide a certain wear allowance. Even if the annular protrusion 12 wears, the area of ​​the sealing ring 12A changes little, the resistance when the valve core rotates is basically constant, and the output torque required by the drive component is basically constant, reducing the possibility of jamming when the valve core rotates and improving the smoothness of the ball valve when switching states.

[0052] In some preferred embodiments of this application, the annular protrusion 12 is configured to have a uniform width along its thickness direction. Thus, even if the annular protrusion 12 wears down over time, the area of ​​the sealing ring 12A remains unchanged, thereby preventing changes in the resistance of the valve core during rotation and maintaining the required output torque for the drive components. This further reduces the possibility of jamming during valve core rotation and improves 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 orifice 1a1, the projection of the flow regulating orifice 1a1 includes:

[0054] Two arc-shaped curves L1 are symmetrically arranged about the center line C perpendicular to the valve core shaft. The two arc-shaped curves L1 bulge towards each other. Each arc-shaped curve L1 has a first end close to the center line C and a second end far from the center line C.

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

[0056] The second superior arc S2 has an opening opposite to the opening of the first superior arc S1, and the second superior arc S2 smoothly connects the second ends of the two arc curves L1.

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

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

[0059] Please refer to Figures 5-6 , Figure 5 A partial structural diagram of a specific embodiment of the ball valve provided in this application in the closed state; Figure 6 for Figure 5 A partial structural diagram of a ball valve in the open state.

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

[0061] Valve core 2;

[0062] Two valve seats, with valve core 2 disposed between the two valve seats, at least one of the valve seats 1 being the aforementioned valve seat 1 for a ball valve, the sealing ring 12A of valve seat 1 and the spherical surface of valve core 2 being sealed and fitted together.

[0063] The ball valve in this embodiment includes the aforementioned valve seat 1 for the ball valve. Therefore, the ball valve in this embodiment has the same technical effect as the aforementioned valve seat 1, and will not be described again here.

[0064] When one of the valve seats is the aforementioned valve seat 1, the valve seat 1 can be located 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 also includes:

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

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

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

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

[0070] As set above, this embodiment uses a limiting pin as a circumferential limiting structure. When the limiting pin is simultaneously inserted into the corresponding first limiting hole 1b and second limiting hole, it plays a circumferential limiting role on the valve seat 1 and the valve body 3. The limiting is reliable, and the structure is simple, reducing costs.

[0071] The number of the first limiting hole 1b, the second limiting hole, and the limiting pin is not limited, as long as it can achieve circumferential limiting of the valve seat 1 and the valve body 3. Preferably, there are two or more of the first limiting hole 1b, the second limiting hole, and the limiting pin. For example, in some embodiments of this application, there are two first limiting holes 1b, the second limiting hole, and the limiting pin. The two first limiting holes 1b are arranged radially opposite to each other, and the two second limiting holes are arranged radially opposite to each other. The limiting pin is inserted into the corresponding first limiting hole 1b and the second limiting hole. The first limiting hole 1b and the second limiting hole are circular holes, and the limiting pin is a cylindrical structure.

[0072] Please refer to Figures 5-7 , Figure 7 for Figure 5 A schematic diagram of the support structure in a 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 also connected in a circumferential limiting manner. Thus, in this embodiment, the support 4 serves to limit the circumferential movement of the valve seat 1 and the valve body 3.

[0074] The valve body 3 has an annular portion 31 inside, which extends axially toward the valve seat 1.

[0075] The support 4 includes a first connecting part 41, which is fitted with a ring part 31. The ring part 31 has a limiting notch a, which penetrates the end wall of the free end of the ring part 31. The first connecting part 41 has a first limiting protrusion b1 extending radially. The first limiting protrusion b1 is inserted into the corresponding limiting notch a and is circumferentially limited.

[0076] As described above, the support 4 can be installed on the valve body 3 by fitting the ring 31 onto the first connecting part 41; the first limiting protrusion b1 inserted into the corresponding limiting notch a can provide circumferential limiting for the support 4 and the valve body 3, preventing the support 4 from circumferentially deflecting relative to the valve body 3. Simultaneously, in this embodiment, the support 4 and the valve body 3 are axially movable, and the ring 31 can also guide the first connecting part 41, ensuring that the first connecting part 41 and the valve seat 1 can only move axially along the extension direction of the ring 31 under external force, thus guaranteeing the positional accuracy of the valve seat 1.

[0077] To ensure reliable circumferential limiting of the support 4 and 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 this application, the first connecting portion 41 has a limiting notch a that penetrates the end wall of the free end of the first connecting portion 41, and the ring portion 31 has a first limiting protrusion b1 that extends radially and is inserted into the interior of the corresponding limiting notch a.

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

[0080] Furthermore, in this embodiment, the first connecting portion 41 has a folded portion 42 that folds outward in a radial direction at one end near the valve seat 1. 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 towards 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 that extends axially. The second limiting protrusion b2 is inserted into the first limiting hole 1b and is circumferentially limited.

[0081] Thus, the folded part 42 and the valve seat 1 abut against the end wall opposite to the valve core 2, which facilitates the joint axial movement of the support 4 and the valve seat 1 under the action of the elastic component 6 (described in detail later); the second limiting protrusion b2 is inserted into the first limiting hole 1b, which can play a circumferential limiting role for the support 4 and the valve seat 1, preventing the valve seat 1 from circumferentially deflecting and improving the positional accuracy of the valve seat 1.

[0082] In this embodiment, the support 4 and the valve body 3 are axially movable, and the support 4 and the valve seat 1 are axially movable. In some embodiments of this application, it is also feasible for the support 4 and the valve body 3 to be axially movable, and the support 4 and the valve seat 1 to be fixedly connected. In this case, it is not necessary to set the second limiting protrusion b2 and the first limiting hole 1b to limit the circumferential movement of the support 4 and the valve seat 1.

[0083] In other embodiments of this application, it is also feasible for the support 4 and the valve body 3 to be fixedly connected, and for the support 4 and the valve seat 1 to be movable along the axial direction. For example, the support 4 and the valve body 3 can be fixedly connected by the first connecting part 41 fixing the sleeve ring part 31. In this case, it is not necessary to set the first limiting protrusion b1 and the limiting notch a. The folding part 42 should be provided with an avoidance notch so that the elastic member 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 member 6.

[0084] To ensure reliable circumferential positioning of the support 4 and 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 this. 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 abuts directly or indirectly against the valve seat 1. The elastic component 6 is in an energy storage state.

[0086] Thus, the elastic component 6 can provide a certain clamping force to the valve seat 1, ensuring that the sealing ring 12A always reliably fits against the spherical surface of the valve core 2, thereby improving the sealing effect. Of course, this clamping force should not be too large, to avoid excessive resistance when the valve core 2 rotates, which could cause the valve core 2 to jam, and to ensure the smooth rotation of the valve core 2.

[0087] like Figure 5 and Figure 6 As shown, in this embodiment, the folding part 42 and the valve seat 1 abut against the end wall opposite to the valve core 2, and the elastic member 6 abuts against the end wall opposite to the valve core 2 of the folding part 42. That is, in this embodiment, the elastic member 6 indirectly abuts against the valve seat 1, and the support 4 and the valve seat 1 move together along the axial direction under the action of the elastic member 6.

[0088] As mentioned above, in some embodiments of this application, the ball valve does not have a support 4, and a limiting pin is used as the circumferential limiting structure for the valve seat 1 and the valve body 3. In this case, 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 a helical spring. In practice, the elastic component 6 can also be a rubber spring, etc.

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

[0091] It is understandable that when the flow rate of the fluid medium through the ball valve is large, the fluid medium will exert a large pressure on the valve seat 1. As mentioned earlier, the valve seat 1 is usually made of non-metallic materials such as polytetrafluoroethylene. Therefore, the valve seat 1 may deform under the action of 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 an increase in the rotational resistance of the valve core 2, resulting in the valve core 2 becoming stuck or even jammed. On the other hand, it may cause a decrease in the sealing between the valve seat 1 and the valve body 3, resulting in internal leakage of the ball valve. Based on this, the ball valve in this embodiment is equipped with a stop 5. The stop 5 can limit the amount of deformation of the valve seat 1. On the one hand, it prevents the valve seat 1 from being squeezed into the space between the valve core 2 and the valve body 3 as much as possible, avoiding an increase in the rotational resistance of the valve core 2 and reducing the possibility of the valve core 2 becoming stuck or even jammed. On the other hand, it avoids a decrease in the sealing between the valve seat 1 and the valve body 3, reducing the possibility of internal leakage of the ball valve.

[0092] Furthermore, as the annular protrusion 12 wears down, the valve seat 1 will move closer to the valve core 2 under the driving force of the elastic member 6. Therefore, there is a gap between the stop 5 and the opposite end wall of the valve seat 1. This gap is used to provide movement space for the valve seat 1 and avoid interference with the movement of the valve seat 1. The axial width of this 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. The ball valve in this embodiment also includes a sealing ring 7, which is installed inside the annular groove 1c. 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 achieving 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 its sealing function, and avoid internal leakage problems in the ball valve.

[0095] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A valve seat for a ball valve, characterized in that The valve seat (1) has an inner hole (1a) extending axially, the inner hole (1a) comprises an axial connection flow regulating hole (1a1) and a matching hole (1a2), a curved surface (11) is formed between the flow regulating hole (1a1) and the matching hole (1a2), the inner peripheral wall of the matching hole (1a2) has a local inwardly protruding annular protruding portion (12), the inner peripheral wall of the annular protruding portion (12) forms a sealing ring (12A), and the ball center of the spherical surface where the sealing ring (12A) is located and the ball center of the spherical surface where the curved surface (11) is located are axially staggered.

2. 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) comprises: Two arc curves (L1), the two arc curves (L1) are symmetrically arranged about a center line (C) perpendicular to the rotation axis of the valve core, the two arc curves (L1) protrude in the direction of approaching each other, and each of the two arc curves (L1) has a first end close to the center line (C) and a second end away from the center line (C); A first optimal arc (S1), the first optimal arc (S1) is symmetrically arranged about the center line (C), and the first optimal arc (S1) smoothly connects the first ends of the two arc curves (L1); A second optimal arc (S2), the opening of the second optimal arc (S2) is opposite to the opening of the first optimal arc (S1), and the second optimal arc (S2) smoothly connects the second ends of the two arc curves (L1).

3. A ball valve characterized by Comprise: A 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 the ball valve of claim 1 or 2, and the sealing ring (12A) of the valve seat (1) and the spherical sealing surface of the valve core (2) are in close contact.

4. The ball valve according to claim 3, characterized in that The ball valve further comprises: A valve body (3), the valve core (2) and the valve seat (1) are arranged in the interior of the valve body (3); A limiting portion, the limiting portion limits the connection between the valve seat (1) and the valve body (3) in the circumferential direction.

5. The ball valve of claim 4, wherein An end wall of the valve seat (1) away from the valve core (2) is provided with a first limiting hole (1b) extending in the axial direction, 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 in corresponding communication, and the limiting portion comprises a limiting pin inserted into the corresponding first limiting hole (1b) and second limiting hole.

6. The ball valve of claim 4, wherein The limiting portion comprises a support (4), the valve body (3) and the support (4) are connected in the circumferential direction, and the valve seat (1) and the support (4) are connected in the circumferential direction.

7. The ball valve of claim 6, wherein The interior of the valve body (3) has a ring portion (31) extending in the axial direction towards the valve seat (1); The support (4) comprises a first connecting part (41) sleeving the ring part (31), a first one of the first connecting part (41) and the ring part (31) has a limiting gap (a) penetrating an end wall of a free end of the first one, and a second one has a first limiting protrusion (b1) extending in a radial direction, the first limiting protrusion (b1) is inserted inside the corresponding limiting gap (a) and is limited in a circumferential direction.

8. The ball valve of claim 7, wherein, The first connecting part (41) has a folded part (42) folded outward in a radial direction near one end of the valve seat (1), the folded part (42) abuts against an end wall of the valve seat (1) facing away from the valve core (2), the folded part (42) is connected with a second limiting protrusion (b2), the second limiting protrusion (b2) extends in an axial direction towards 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 an axial direction, the second limiting protrusion (b2) is inserted inside the first limiting hole (1b) and is limited in a circumferential direction.

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

10. A ball valve according to any one of claims 4-8, characterised in that The ball valve further comprises a blocking part (5) located on a side of the valve seat (1) close to the valve core (2), the blocking part (5) is fixed to the valve body (3), and the blocking part (5) and the opposite end wall of the valve seat (1) have a gap therebetween.

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