Valve seat sealing structure and eccentric C-shaped ball valve

Abstract

The invention discloses a valve seat sealing structure and an eccentric C-shaped ball valve, and relates to the field of ball valve sealing. The valve seat sealing structure comprises a valve seat piece, and the valve seat piece is installed in the valve body and is configured to be of an elastic structure. A sealing end suitable for abutting against the ball body is constructed on the valve seat piece; the valve seat piece is provided with a first groove part and a second groove part. According to the valve, the valve seat piece is of an elastic structure, excessive wedge-caulking of the sealing end can be avoided, the valve is promoted to be opened smoothly, and the valve seat piece is elastically deformed under the action of a pressure medium in the valve so as to assist in sealing; the groove part facilitates elastic deformation of the valve seat piece and drives the sealing end to move and be tightly attached to the ball body so as to assist sealing. The groove part can reduce the resistance force of the elastic deformation of the valve seat, so that the pressure medium can act on the valve seat piece to smoothly deform. The opening and closing performance of the valve is optimized, and the bidirectional sealing performance of the valve can be improved.

Description

Technical Field

[0001] The invention relates to the field of ball valve sealing, and in particular to a valve seat sealing structure and an eccentric C-type ball valve. Background Art

[0002] The eccentric C-type ball valve, also known as the eccentric hemispherical valve, is a valve in which the center axis of the valve shaft is eccentric to the center line of the hemispherical body (C-type ball), and a sealing pair is only provided on one side of the valve body. The typical structure is that a single valve seat is located downstream of the valve, and the C-type ball rotates on two motion planes, and uses the force of the valve stem to resist the fixed valve seat to achieve closing and sealing. C-type ball valves are usually used for fluid control in high-pressure and high-temperature environments, such as the petroleum, chemical and power industries.

[0003] At present, eccentric C-type ball valves generally use rigid valve seats. When the ball seat is squeezed when closing the sealing surface, the sealing surface of the ball seat is prone to excessive wedging, resulting in difficulty in opening the valve, and its sealing performance is poor during the working stage. Summary of the invention

[0004] In order to solve the technical problems raised by the above background technology, the present invention provides a valve seat sealing structure, including a valve seat member, the valve seat member is installed in a valve body, the valve seat member is configured as an elastic structure; the valve seat member is configured with a sealing end suitable for abutting against a ball;

[0005] The valve seat member is provided with a first groove portion and a second groove portion, the first groove portion is recessed on the inner wall surface of the valve seat member, the second groove portion is recessed on the outer wall surface of the valve seat member, and the first groove portion and the second groove portion are staggered and arranged along the extension direction of the length of the valve seat member;

[0006] The pressure medium can flow into the valve channel along the first direction and into the first groove portion, so as to cause the valve seat member to elastically deform, thereby extending and causing the sealing end to tightly abut against the ball;

[0007] The pressure medium can also flow into the middle cavity channel along the second direction and into the second groove portion to cause the valve seat member to elastically deform and extend the sealing end to tightly abut against the ball.

[0008] As a preferred technical solution, a third groove portion is further provided on the valve seat member, and the third groove portion is recessed on the inner wall surface of the valve seat member, and the third groove portion is spaced apart in the direction of the first groove portion away from the sealing end, and the third groove portion and the second groove portion are spaced apart and staggered along the extension direction of the length of the valve seat member.

[0009] As a preferred technical solution, the valve seat member includes a first elastic body, a second elastic body, a third elastic body and a fourth elastic body fixedly connected in sequence, the sealing end is arranged on the end surface of the fourth elastic body facing the sphere, the first groove portion is hollowed out and arranged between the third elastic body and the fourth elastic body, the second groove portion is hollowed out and arranged between the second elastic body and the third elastic body, and the third groove portion is hollowed out and arranged between the first elastic body and the second elastic body.

[0010] As a preferred technical solution, any elastic body is configured as a rotating body structure, the outer diameter of the third elastic body is smaller than the outer diameter of the second elastic body, and the outer diameter of the fourth elastic body is smaller than the outer diameter of the second elastic body; and / or

[0011] The valve seat sealing structure also includes a first seal, a step groove is constructed on the first elastic body, the step groove is arranged on the wall surface of the first elastic body away from the third groove portion, and the first seal is crimped between the step groove and the valve body; the valve seat sealing structure also includes a second seal, a protrusion is provided on the step groove, and the protrusion is suitable for isolating the first seal and the second seal.

[0012] As a preferred technical solution, the valve seat sealing structure further includes a crimping assembly, which is suitable for abutting and installing the valve seat member, and a gap space is provided between the crimping assembly and the valve seat member to allow pressure medium to enter the second groove portion.

[0013] As a preferred technical solution, the crimping assembly includes a pressing ring, a threaded ring and a locking piece. The pressing ring is connected to the threaded ring through a plurality of locking pieces. The pressing ring is limitedly abutted against the valve seat piece. The threaded ring is suitable for being fixedly connected to the valve body. A plurality of locking pieces are arranged in a ring-shaped distribution.

[0014] As a preferred technical solution, the crimping assembly further includes a spring washer, the spring washer is sleeved on the locking member, and the spring washer is installed between the locking member and the pressing ring; and / or

[0015] The threaded ring is configured as a multi-open ring structure; and / or

[0016] At least a portion of the valve seat member extends into the pressure ring so that the sealing end is arranged toward the ball, and an escape gap is arranged between the pressure ring and the valve seat member.

[0017] As a preferred technical solution, any groove portion is configured as an annular groove body, and the end of the annular groove body away from the wall surface of the valve seat member has a curved surface portion; and / or

[0018] The valve seat member is configured to be one of carbon steel, stainless steel, and nickel-based alloy.

[0019] This embodiment also provides an eccentric C-type ball valve, including a valve body, a ball and the above-mentioned valve seat sealing structure.

[0020] As a preferred technical solution, the eccentric C-type ball valve further includes an upper mounting assembly and a lower mounting assembly, wherein the upper mounting assembly and the lower mounting assembly are relatively spaced apart and arranged on both sides of the sphere, and the sphere is rotatably arranged in the valve body through the upper mounting assembly and the lower mounting assembly; and / or

[0021] The eccentric C-type ball valve also includes a valve cover, a valve stem, a bracket and an actuating mechanism. The valve cover is detachably connected to the valve body. One end of the valve stem passes through the valve cover and is fixedly connected to the ball body. The other end of the valve stem is transmission-connected to the actuating end of the actuating mechanism. The valve stem and the valve cover are rotatably configured. The bracket is installed on the upper end of the valve cover, and the actuating mechanism is fixedly arranged on the bracket.

[0022] The technical solution provided by the present invention has the following advantages:

[0023] 1. The valve seat sealing structure provided by the present invention includes a valve seat member, which is installed in a valve body and is configured as an elastic structure; the valve seat member is constructed with a sealing end suitable for abutting against a ball; the valve seat member is provided with a first groove portion and a second groove portion, the first groove portion is recessed on the inner wall surface of the valve seat member, and the second groove portion is recessed on the outer wall surface of the valve seat member, and the first groove portion and the second groove portion are staggered and arranged at intervals along the extension direction of the length of the valve seat member.

[0024] The valve seat sealing structure of this structure adopts an elastic structure of the valve seat member, which can avoid excessive wedging at the sealing end, promote the smooth opening of the valve, and use the pressure medium in the valve to elastically deform the valve seat member to assist in sealing. Specifically, a first groove portion is recessed on the inner wall surface of the valve seat member, and a second groove portion is recessed on the outer wall surface of the valve seat member. This arrangement, on the one hand, can facilitate the pressure medium to flow into the groove portion, so as to concentrate the pressure on the wall surface of the groove portion, so that the valve seat member is elastically deformed, and the sealing end is driven to move and close to the ball to assist in sealing; on the other hand, the groove portions arranged on the inner and outer wall surfaces can reduce the resistance force of the elastic deformation of the valve seat itself on the other side when the pressure medium enters one side, so as to enable the pressure medium to act on the valve seat member to smoothly deform; the present invention optimizes the performance of valve opening and closing, and is conducive to improving the two-way sealing performance of the valve.

[0025] 2. The valve seat sealing structure provided by the present invention is further provided with a third groove portion on the valve seat member, the third groove portion is recessed on the inner wall surface of the valve seat member, the third groove portion is spaced apart in the direction away from the sealing end of the first groove portion, and the third groove portion and the second groove portion are spaced apart and staggered along the extension direction of the length of the valve seat member.

[0026] The valve seat sealing structure of this structure performs sealing compensation or further reduces deformation resistance through the third groove portion; specifically, the pressure medium passes into the valve channel in a first direction and enters the first groove portion. Similarly, the pressure medium enters the third groove portion, and the internal spaces of the first groove portion and the third groove portion expand and are gradually filled with the pressure medium. The third groove portion is beneficial to assist elastic compensation for the valve seat member, so that the valve seat member as a whole can be elastically deflected toward the sealing end to enhance the sealing effect on the ball; the pressure medium passes into the middle cavity channel in a second direction and enters the second groove portion. The third groove portion is beneficial to assist elastic giving way to the valve seat member, reduces the resistance to the deformation movement of the valve seat member, and enables the valve seat member as a whole to be elastically deflected toward the sealing end, which also enhances the sealing effect on the ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a partial structure of a valve seat sealing structure provided by the present invention;

[0029] Figure 2 A schematic structural diagram of a valve seat member in a valve seat sealing structure provided by the present invention;

[0030] Figure 3 A schematic diagram of the pressure medium in the valve seat sealing structure provided by the present invention along a first direction;

[0031] Figure 4 A schematic diagram of the pressure medium in the valve seat sealing structure provided by the present invention along the second direction;

[0032] Figure 5 A schematic structural diagram of one of the second manifestations of the valve seat sealing structure provided by the present invention;

[0033] Figure 6 A structural schematic diagram of the second embodiment of the valve seat sealing structure provided by the present invention;

[0034] Figure 7A structural schematic diagram of the third second embodiment of the valve seat sealing structure provided by the present invention;

[0035] Figure 8 An exploded schematic diagram of a valve seat sealing structure and a valve body in an eccentric C-type ball valve provided by the present invention;

[0036] Fig. 9 A cross-sectional schematic diagram of an eccentric C-type ball valve provided by the present invention;

[0037] Description of reference numerals:

[0038] 1-valve seat member; 101-first groove portion; 102-second groove portion; 103-third groove portion; 104-sealing end; 11-first elastic body; 12-second elastic body; 13-third elastic body; 14-fourth elastic body; 15-step groove;

[0039] 2-crimping assembly; 21-pressing ring; 22-threaded ring; 23-locking piece; 24-spring pad;

[0040] 31-first sealing member; 32-second sealing member;

[0041] 41-valve body; 42-valve cover; 43-valve stem; 44-bracket;

[0042] 5-sphere;

[0043] 61-upper bearing; 62-upper adjustment pad; 63-lower bearing; 64-lower adjustment pad;

[0044] 7- Actuating mechanism. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, including scheme A, or scheme B, or schemes that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Example 1

[0049] Referring now to the drawings, in which like reference numerals represent like parts and components throughout the several views, Figures 1 to 8 An embodiment of the present invention is shown.

[0050] Figures 1 to 8 The first embodiment shown is a valve seat sealing structure, which includes a valve seat member 1, which is installed in a valve body 41 and is configured as an elastic structure; a sealing end 104 suitable for abutting against a ball 5 is constructed on the valve seat member 1. The valve body 41 has a valve channel for the flow of pressure medium, and the ball 5 can rotate to open or close the valve channel. The valve body 41 also has a middle cavity channel, which is located in the overlapping space outside the ball 5 and inside the valve body 41. The middle cavity channel can be used as an installation space for the valve to install the ball 5, the valve seat member 1 and other structures. During the valve switching process, the middle cavity channel can provide a space for the ball 5 to rotate.

[0051] In the implementation method based on this embodiment, if Figure 2 As shown, a first groove portion 101 and a second groove portion 102 are provided on the valve seat member 1. The first groove portion 101 is recessed on the inner wall surface of the valve seat member 1, and the second groove portion 102 is recessed on the outer wall surface of the valve seat member 1. The first groove portion 101 and the second groove portion 102 are staggered and arranged at intervals along the extension direction of the length of the valve seat member 1.

[0052] As an implementation of the first form, Figure 3 As shown, the pressure medium can flow into the valve channel along the first direction and enter the first groove portion 101, so as to cause the valve seat member 1 to undergo elastic deformation, so as to expand the internal space of the first groove portion 101, reduce the internal space of the second groove portion 102, and extend the sealing end 104 to be tightly abutted against the ball 5. The pressure medium flows into the first groove portion 101 along the first direction, and can concentrate pressure on the wall surface of the first groove portion 101, so as to cause the valve seat member 1 to undergo elastic deformation, expand the internal space of the first groove portion 101, and gradually fill with the pressure medium, reduce the internal space of the second groove portion 102, and enter the original position space through the deformed part of the valve seat member 1, and the valve seat member 1 gradually elastically deflects and extends, so as to drive the sealing end 104 to move and be close to the ball 5, so as to achieve auxiliary sealing in the first direction.

[0053] As an implementation of the first form, Figure 4 As shown, the pressure medium can also pass into the middle cavity channel along the second direction and enter the second groove portion 102, so as to cause the valve seat member 1 to elastically deform, so that the internal space of the second groove portion 102 is expanded, the internal space of the first groove portion 101 is reduced, and the extended sealing end 104 is tightly abutted against the ball 5. The pressure medium flows into the second groove portion 102 along the second direction, and can concentrate on applying pressure to the wall surface of the second groove portion 102, so that the valve seat member 1 is elastically deformed, the internal space of the second groove portion 102 is expanded, and gradually filled with the pressure medium, the internal space of the first groove portion 101 is reduced, and the original position space is entered by the deformed part of the valve seat member 1, and the valve seat member 1 is gradually elastically offset and extended, so as to drive the sealing end 104 to move and be close to the ball 5, so as to achieve auxiliary sealing in the second direction.

[0054] The valve seat sealing structure provided in the present embodiment adopts an elastic structure of the valve seat member 1, which can avoid excessive wedging of the sealing end 104, promote the smooth opening of the valve, and use the pressure medium in the valve to elastically deform the valve seat member 1 to assist in sealing. Specifically, a first groove portion 101 is recessed on the inner wall surface of the valve seat member 1, and a second groove portion 102 is recessed on the outer wall surface of the valve seat member 1. This arrangement, on the one hand, can facilitate the pressure medium to flow into the groove portion, so as to concentrate the pressure on the wall surface of the groove portion, so that the valve seat member 1 is elastically deformed, and the sealing end 104 is driven to move and tightly fit the ball 5 to assist in sealing; on the other hand, the groove portions arranged on the inner and outer wall surfaces can reduce the resistance force of the elastic deformation of the valve seat itself on the other side when the pressure medium enters one side, so as to enable the pressure medium to act on the valve seat member 1 to smoothly deform; the present invention optimizes the performance of opening and closing the valve, has good sealing flexibility, and is conducive to improving the two-way sealing performance of the valve.

[0055] As a further implementation of the first form of expression, Figure 2 As shown, a third groove portion 103 is also provided on the valve seat member 1. The third groove portion 103 is recessed on the inner wall surface of the valve seat member 1. The third groove portion 103 is spaced apart in the direction of the first groove portion 101 away from the sealing end 104. The third groove portion 103 and the second groove portion 102 are spaced apart and staggered along the extension direction of the length of the valve seat member 1. This arrangement can perform sealing compensation or further reduce deformation resistance through the third groove portion 103; specifically, the pressure medium enters the valve channel in a first direction and enters the first groove portion 101. Similarly, the pressure medium enters the third groove portion 103, and the internal spaces of the first groove portion 101 and the third groove portion 103 expand and are gradually filled with the pressure medium. The third groove portion 103 is beneficial to assist elastic compensation for the valve seat member 1, so that the valve seat member 1 as a whole can be elastically deflected toward the sealing end 104 to enhance the sealing effect on the ball 5; the pressure medium enters the middle cavity channel in a second direction and enters the second groove portion 102. The third groove portion 103 is beneficial to assist elastic giving way to the valve seat member 1, reduce the resistance to the deformation movement of the valve seat member 1, and enable the valve seat member 1 as a whole to be elastically deflected toward the sealing end 104, which also enhances the sealing effect on the ball 5.

[0056] In the valve seat sealing structure provided in this embodiment, when the valve is closed, the ball contacts and squeezes the sealing end 104, and the valve seat member 1 is more likely to undergo elastic deformation, which is conducive to the fit of the sealing end 104, thereby improving the sealing performance. The groove design of the first groove portion 101, the second groove portion 102, and the third groove portion 103 increases the elasticity of the valve seat, and when the valve is closed, it is prevented that the ball seat sealing surface may be over-wedge-tightened, which may cause difficulty in opening the valve.

[0057] The structural arrangement of the first groove portion 101, the second groove portion 102 and the third groove portion 103 is as follows:

[0058] In this embodiment, the first groove portion 101 and the second groove portion 102 are staggered along the extension direction of the valve seat member 1 , which is beneficial for obtaining sufficient groove space and reducing the impact on the structure of the valve seat member 1 itself.

[0059] For example, in some embodiments, the first groove portion 101, the second groove portion 102 and the third groove portion 103 are configured to have the same groove depth. This configuration is beneficial to the balanced deformation of the valve seat member 1 and prolongs the service life of the valve seat member 1.

[0060] For example, in some embodiments, any groove portion is configured as an annular groove body, and the end of the annular groove body away from the wall of the valve seat member 1 has a curved surface portion. The groove portion is specifically configured as an annular groove body, which can make the valve seat member 1 deform evenly and synchronously when the pressure medium enters, thereby ensuring the effective sealing effect of the sealing end 104; the annular groove has a curved surface portion, which can make the two adjacent elastic bodies perform good elastic extension and rebound reset, which is beneficial to prolonging the service life of the valve seat member 1.

[0061] In the specific implementation process, one or more first groove parts 101 are provided, and one or more second groove parts 102 are provided. The specific size, shape, quantity, position, etc. of the groove parts are adjusted and configured according to specific valve specifications, working conditions and other factors.

[0062] As the first form of structural arrangement, Figure 2 As shown, the valve seat member 1 includes a first elastic body 11, a second elastic body 12, a third elastic body 13 and a fourth elastic body 14 which are fixedly connected in sequence, a sealing end 104 is arranged on the end surface of the fourth elastic body 14 facing the ball 5, a first groove portion 101 is hollowed out and arranged between the third elastic body 13 and the fourth elastic body 14, a second groove portion 102 is hollowed out and arranged between the second elastic body 12 and the third elastic body 13, and a third groove portion 103 is hollowed out and arranged between the first elastic body 11 and the second elastic body 12. The first elastic body 11 is arranged adjacent to the valve body 41, the fourth elastic body 14 is arranged adjacent to the ball 5, and the sealing end 104 is arranged on the fourth elastic body 14.

[0063] The pressure medium enters the valve and causes the valve seat 1 to deform elastically; Figure 2 and Figure 3As shown, when the pressure medium enters the valve channel along the first direction and enters the first groove portion 101 and the third groove portion 103, the pressure medium of the third groove portion 103 squeezes the second elastic body 12 to move leftward, so that the second elastic body 12 can drive the third elastic body 13 and the fourth elastic body 14 to move leftward, thereby making the sealing end 104 close to the ball 5, and the pressure medium of the first groove portion 101 squeezes the fourth elastic body 14 to move leftward, further strengthening the force of the sealing end 104 close to the ball 5, achieving the purpose of auxiliary sealing. Figure 2 and Figure 4 As shown, when the pressure medium passes into the middle cavity channel along the second direction and enters the second groove portion 102, the pressure medium of the second groove portion 102 squeezes the third elastic body 13 and the fourth elastic body 14 to move left, and squeezes the second elastic body 12 to move right, and the first groove portion 101 and the third groove portion 103 avoid the moving position of the elastic body, so that the sealing end 104 is well attached to the ball 5, thereby achieving the purpose of auxiliary sealing.

[0064] In the above description, the sealing end 104 is set as a sealing end face, and the sealing end 104 can be made of a hardened material. The material is selected according to the operation requirements and specific working conditions (temperature, pressure, cost, corrosion characteristics, etc.); the hardening molding method may include: high velocity spraying (HVOF), flame spraying (HVAF), thermal spraying, surfacing, etc.

[0065] Figures 1 to 8 The second embodiment shown in the figure is a valve seat sealing structure, such as Figure 1 As shown, it also includes a first seal 31, a step groove 15 is constructed on the first elastic body 11, the step groove 15 is arranged on the wall surface of the first elastic body 11 away from the third groove portion 103, and the first seal 31 is crimped between the step groove 15 and the valve body 41. The first seal 31 is used to seal the local contact portion between the valve seat member 1 and the valve body 41. Preferably, the first seal 31 and the step groove 15 are configured as an interference connection, and the elasticity of the first seal 31 ensures the sealing effect between the valve seat member 1 and the valve body 41. In some embodiments, the first seal 31 is configured as one of graphite filler, O-ring, fireproof graphite, and lip seal ring.

[0066] As a further implementation of the second form of expression, Figures 5 to 7As shown, the valve seat sealing structure also includes a second sealing member 32, and a protrusion is provided on the step groove 15, and the protrusion is suitable for isolating the first sealing member 31 and the second sealing member 32. The first sealing member 31 and the second sealing member 32 are used together to seal the local contact portion between the valve seat member 1 and the valve body 41. Preferably, the first sealing member 31, the second sealing member 32 and the step groove 15 are configured as an interference connection, and the elastic capacity of the first sealing member 31 and the second sealing member 32 is used to enhance the sealing effect between the valve seat member 1 and the valve body 41. In some embodiments, the second sealing member 32 is configured as one of graphite filler, O-ring, fireproof graphite, and lip seal ring.

[0067] Of course, other types of sealing materials and other seals can be selected according to the operating conditions, including but not limited to: O-rings, lip seals and multiple combination seals.

[0068] Figures 1 to 8 The third embodiment shown is a valve seat sealing structure, which also includes a crimping assembly 2, which is suitable for abutting and installing the valve seat member 1, and a gap space is provided between the crimping assembly 2 and the valve seat member 1 for the pressure medium to enter the second groove portion 102.

[0069] As an implementation of the second form of expression, Figures 1 to 8 As shown, the crimping assembly 2 includes a pressing ring 21, a threaded ring 22 and a locking member 23. The pressing ring 21 is connected to the threaded ring 22 through a plurality of locking members 23. The pressing ring 21 is in limited contact with the valve seat member 1. The threaded ring 22 is suitable for being fixedly connected with the valve body 41. The plurality of locking members 23 are arranged in an annular distribution. Through this arrangement, the valve seat member 1 is assembled and pressed together to prevent the valve seat member 1 from axial deviation.

[0070] As a further implementation of the second form of expression, Figures 1 to 8 As shown, the crimping assembly 2 further includes a spring pad 24, which is sleeved on the locking member 23 and installed between the locking member 23 and the pressing ring 21. Through this arrangement, the elastic pressing structure is utilized to enhance the connection strength of the valve seat member 1.

[0071] As a structural arrangement of the second expression form, the threaded ring 22 is configured as a multi-open ring structure. The multi-open ring structure can facilitate the convenient combination and assembly between the threaded ring 22 and the valve body 41; preferably, the threaded ring 22 is configured as a four-open ring structure.

[0072] As an implementation of the second form of expression, at least part of the valve seat member 1 extends into the pressure ring 21, so that the sealing end 104 is arranged toward the ball 5, and an escape gap is arranged between the pressure ring 21 and the valve seat member 1. On the one hand, the escape gap can be used as a channel for the pressure medium to enter / exit the second groove portion 102; on the other hand, the escape gap can be used as a deformation clearance space for the valve seat member 1, and the pressure ring 21 plays a role in stopping and limiting the elastic deformation of the valve seat member 1, ensuring that the sealing end 104 and the ball 5 are effectively tightly abutted and sealed.

[0073] As the structural arrangement of the first and second expressions, any elastic body is set as a rotating body structure, the outer diameter of the third elastic body 13 is smaller than the outer diameter of the second elastic body 12, and the outer diameter of the fourth elastic body 14 is smaller than the outer diameter of the second elastic body 12. After the valve seat member 1 is assembled, the third elastic body 13 and the fourth elastic body 14 are specifically placed on the inner side of the pressure ring 21, and the outer diameters of the third elastic body 13 and the fourth elastic body 14 are both smaller than the inner diameter of the pressure ring 21 to form the above-mentioned avoidance gap, so that the pressure medium can enter the second groove portion 102. Of course, the avoidance gap can be used as a displacement space for the deformation of the third elastic body 13 and the fourth elastic body 14, so that when the pressure medium enters the first groove portion 101 and the third groove portion 103, the third elastic body 13 and the fourth elastic body 14 occupy the avoidance gap, and the inner wall of the pressure ring 21 can limit the third elastic body 13 and the fourth elastic body 14.

[0074] Regarding the limiting contact between the pressure ring 21 and the valve seat member 1: Specifically, Figure 1 and Figure 2 As shown, the right end face of the pressure ring 21 is limitedly abutted against the left end face of the second elastic body 12 , wherein the inner diameter of the pressure ring 21 is smaller than the outer diameter of the second elastic body 12 and smaller than the outer diameter of the pressure ring 21 .

[0075] Through the above solution, the crimping assembly 2 cooperates with the valve body 41 to limit the valve seat member 1, thereby preventing the valve seat member 1 from having excessive axial displacement under the action of the medium pressure, which may lead to valve failure.

[0076] As a preferred embodiment, the valve seat member 1 is made of one of carbon steel, stainless steel and nickel-based alloy.

[0077] The valve seat sealing structure provided in this embodiment can make corresponding elastic deformation when the ball seat is closed and the sealing surface is squeezed; the sealing end 104 can be better fitted, thereby improving the sealing performance; at the same time, it can avoid the problem that the sealing end 104 may be over-wedge-tightened, resulting in difficulty in opening the valve. The medium pressure in the valve can act on the elastic groove designed in the valve seat, and the appropriate elastic deformation of the valve seat can be achieved by squeezing the inner side of the elastic groove, which can further improve the sealing performance of the ball seat and effectively improve the bidirectional sealing performance of the valve.

[0078] Example 2

[0079] Figure 8 and Fig. 9 The embodiment shown is in the form of an eccentric C-type ball valve, which includes a valve body 41, a ball 5 and the above-mentioned valve seat sealing structure.

[0080] As a preferred embodiment, see Fig. 9 The eccentric C-type ball valve also includes an upper mounting assembly and a lower mounting assembly, which are relatively spaced apart and arranged on both sides of the ball 5, and the ball 5 is rotatably arranged in the valve body 41 through the upper mounting assembly and the lower mounting assembly.

[0081] For example, in some embodiments, the upper mounting assembly includes an upper bearing 61 and an upper adjustment pad 62, the lower mounting assembly includes a lower bearing 63 and a lower adjustment pad 64, the upper and lower sides of the sphere 5 are respectively provided with an upper flange and a lower flange, the upper bearing 61 and the upper adjustment pad 62 are sleeved on the upper flange, the upper side of the sphere 5 is rotatably configured with the valve cover 42 through the upper bearing 61 and the upper adjustment pad 62, the lower bearing 63 and the lower adjustment pad 64 are sleeved on the lower flange, the lower side of the sphere 5 is rotatably configured with the valve body 41 through the lower bearing 63 and the lower adjustment pad 64, and the upper bearing 61 and the lower bearing 63 are coaxially arranged.

[0082] As a preferred embodiment, see Fig. 9 The eccentric C-type ball valve also includes a valve cover 42, a valve stem 43, a bracket 44 and an actuating mechanism 7. The valve cover 42 is detachably connected to the valve body 41. One end of the valve stem 43 passes through the valve cover 42 and is fixedly connected to the ball 5. The other end of the valve stem 43 is drivingly connected to the actuating end of the actuating mechanism 7. The valve stem 43 and the valve cover 42 are rotatably configured. The bracket 44 is installed on the upper end of the valve cover 42, and the actuating mechanism 7 is fixedly arranged on the bracket 44.

[0083] In some embodiments, the valve body 41 is configured as a detachable structure, see Fig. 9 The valve body 41 includes a main body portion on the left side of the figure and a connecting portion on the right side; in the specific assembly stage, the ball 5 is assembled first, and then the valve seat member 1 is installed on the connecting portion on the right side through the crimping assembly 2, and finally the main body portion and the connecting portion are assembled so that the valve seat member 1 is installed between the ball 5 and the valve body 41.

[0084] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A valve seat sealing structure, characterized in that: The valve seat member (1) comprises a valve seat member (1), the valve seat member (1) being installed in a valve body (41), the valve seat member (1) being configured as an elastic structure; the valve seat member (1) is provided with a sealing end (104) suitable for abutting against a ball (5); The valve seat member (1) is provided with a first groove portion (101) and a second groove portion (102), wherein the first groove portion (101) is recessed on the inner wall surface of the valve seat member (1), and the second groove portion (102) is recessed on the outer wall surface of the valve seat member (1), and the first groove portion (101) and the second groove portion (102) are arranged in an offset manner along the extension direction of the length of the valve seat member (1); The pressure medium can flow into the valve channel along a first direction and enter the first groove portion (101), so as to cause the valve seat member (1) to elastically deform, thereby extending the sealing end (104) to seal against the ball (5); The pressure medium can also flow into the middle cavity channel along the second direction and enter the second groove portion (102), so as to cause the valve seat member (1) to elastically deform, thereby extending the sealing end (104) to seal against the ball (5).

2. The valve seat sealing structure according to claim 1, characterized in that: The valve seat member (1) is also provided with a third groove portion (103), and the third groove portion (103) is recessed on the inner wall surface of the valve seat member (1). The third groove portion (103) is spaced apart in a direction away from the sealing end (104) of the first groove portion (101). The third groove portion (103) and the second groove portion (102) are spaced apart and staggered along the extension direction of the length of the valve seat member (1).

3. The valve seat sealing structure according to claim 2, characterized in that: The valve seat member (1) comprises a first elastic body (11), a second elastic body (12), a third elastic body (13) and a fourth elastic body (14) which are fixedly connected in sequence, the sealing end (104) is arranged on the end surface of the fourth elastic body (14) facing the ball (5), the first groove portion (101) is hollowed out and arranged between the third elastic body (13) and the fourth elastic body (14), the second groove portion (102) is hollowed out and arranged between the second elastic body (12) and the third elastic body (13), and the third groove portion (103) is hollowed out and arranged between the first elastic body (11) and the second elastic body (12).

4. The valve seat sealing structure according to claim 3, characterized in that: Any elastic body is configured as a rotating body structure, the outer diameter of the third elastic body (13) is smaller than the outer diameter of the second elastic body (12), and the outer diameter of the fourth elastic body (14) is smaller than the outer diameter of the second elastic body (12); and / or The valve seat sealing structure also includes a first sealing member (31), a step groove (15) is constructed on the first elastic body (11), and the step groove (15) is arranged on the wall surface of the first elastic body (11) away from the third groove portion (103), and the first sealing member (31) is crimped between the step groove (15) and the valve body (41); the valve seat sealing structure also includes a second sealing member (32), a protrusion is provided on the step groove (15), and the protrusion is suitable for isolating the first sealing member (31) and the second sealing member (32).

5. The valve seat sealing structure according to any one of claims 1 to 4, characterized in that: The valve seat sealing structure further comprises a crimping assembly (2), wherein the crimping assembly (2) is suitable for abutting and mounting the valve seat member (1), and a gap space is provided between the crimping assembly (2) and the valve seat member (1) to allow pressure medium to enter the second groove portion (102).

6. The valve seat sealing structure according to claim 5, characterized in that: The crimping assembly (2) comprises a pressing ring (21), a threaded ring (22) and a locking piece (23); the pressing ring (21) is connected to the threaded ring (22) via a plurality of locking pieces (23); the pressing ring (21) is in limiting contact with the valve seat member (1); the threaded ring (22) is suitable for being fixedly connected to the valve body (41); and a plurality of locking pieces (23) are arranged in an annular distribution.

7. The valve seat sealing structure according to claim 6, characterized in that: The crimping assembly (2) further comprises a spring pad (24), wherein the spring pad (24) is sleeved on the locking member (23), and the spring pad (24) is installed between the locking member (23) and the pressing ring (21); and / or The threaded ring (22) is configured as a multi-open ring structure; and / or At least a portion of the valve seat member (1) extends into the pressure ring (21), so that the sealing end (104) is arranged toward the ball (5), and an escape gap is arranged between the pressure ring (21) and the valve seat member (1).

8. The valve seat sealing structure according to any one of claims 1 to 4, characterized in that: Any groove portion is configured as an annular groove body, and the end of the annular groove body away from the wall surface of the valve seat member (1) has a curved surface portion; and / or The valve seat member (1) is made of one of carbon steel, stainless steel and nickel-based alloy.

9. An eccentric C-type ball valve, characterized in that: It comprises a valve body (41), a ball (5) and a valve seat sealing structure as claimed in any one of claims 1 to 8.

10. The eccentric C-type ball valve according to claim 9, characterized in that: The eccentric C-type ball valve further comprises an upper mounting assembly and a lower mounting assembly, wherein the upper mounting assembly and the lower mounting assembly are arranged at opposite sides of the ball (5) with a relative spacing, and the ball (5) is rotatably arranged in the valve body (41) through the upper mounting assembly and the lower mounting assembly; and / or The eccentric C-type ball valve further comprises a valve cover (42), a valve stem (43), a bracket (44) and an actuating mechanism (7); the valve cover (42) is detachably connected to the valve body (41); one end of the valve stem (43) passes through the valve cover (42) and is fixedly connected to the ball body (5); the other end of the valve stem (43) is drivingly connected to an actuating end of the actuating mechanism (7); the valve stem (43) and the valve cover (42) are rotatably arranged; the bracket (44) is mounted on the upper end of the valve cover (42); and the actuating mechanism (7) is fixedly arranged on the bracket (44).

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