Valve seat and plug valve

Abstract

The utility model discloses a valve seat and a plug valve, and relates to the field of valves. A valve seat includes: a cylindrical valve seat body; a cambered surface is arranged at one end of the valve seat body in the axial direction of the valve seat, and the cambered surface is used for being matched with a plug cock of the plug valve; the valve seat body is provided with a flow channel hole for fluid to pass through, one end of the flow channel hole penetrates through the cambered surface at one end of the valve seat body in the axial direction, and the other end of the flow channel hole penetrates through the other end of the valve seat body in the axial direction. The problems that a sealing arc piece is complex in machining, high in cost, prone to deformation and the like can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valves, and particularly relates to a valve seat and a plug valve. BACKGROUND

[0002] With the increase of oil and gas field exploitation in China, more and more efficient fracturing construction methods such as 'factory type' fracturing and 'zipper type' fracturing are used, and in order to improve the later production, the fracturing construction pressure is higher and higher, the construction discharge is larger and larger, and various fracturing sands squeezed into the well bottom are more and more, which will cause the rapid sand accumulation and failure of the plug valve, and increase the construction cost.

[0003] Some plug valves in the related art use a circular arc-shaped sealing arc piece to seal between the valve body and the plug. In order to meet the design requirements, the surface quality and the dimensional accuracy of the sealing arc piece are required to be high, which leads to a complex processing technology and a high processing cost, and the sealing arc piece is prone to deformation in use and causes leakage. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a valve seat and a plug valve, which can solve the problems of complex processing, high cost and easy deformation of the sealing arc piece.

[0005] In order to solve the above technical problems, the application is implemented as follows:

[0006] The valve seat provided by the application comprises a cylindrical valve seat body.

[0007] The valve seat body is provided with an arc surface at one end in the axial direction of the valve seat, and the arc surface is used to cooperate with a plug of a plug valve.

[0008] The valve seat body is provided with a flow channel hole for passing fluid, one end of the flow channel hole penetrates the arc surface at one end of the valve seat body in the axial direction, and the other end of the flow channel hole penetrates the other end of the valve seat body in the axial direction.

[0009] The application also provides a plug valve, which comprises a valve body, a plug, an elastic member and the valve seat.

[0010] The valve body is provided with a valve cavity, the valve seat is installed in the valve cavity, the elastic member elastically connects the valve seat and the valve body, the plug is arranged in the valve cavity and rotationally cooperates with the arc surface.

[0011] In the embodiment of the present application, the valve seat has a cylindrical valve seat body, and an arc surface is arranged at one end of the valve seat body in the axial direction. The arc surface can be matched with the plug to seal the outer wall of the plug. The flow channel hole is arranged to allow fluid to flow when the plug is opened. Compared with the sealing arc piece arranged between the plug and the valve body in the related art, the valve seat in the embodiment of the present application has a large axial dimension, so that the valve seat is not easy to deform when bearing a large load, thereby stably supporting the plug, effectively preventing the sealing failure between the valve seat and the plug caused by the deformation of the valve seat, and compared with the sealing arc surface, the design requirement of the valve seat in the embodiment of the present application is relatively low, without the need to use very high surface quality and size precision, thereby reducing the process complexity and reducing the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 A first structural schematic view of the valve seat disclosed in the embodiment of the present application;

[0013] Figure 2 A second structural schematic view of the valve seat disclosed in the embodiment of the present application;

[0014] Figure 3 A cross-sectional schematic view of the valve seat disclosed in the embodiment of the present application;

[0015] Figure 4 A partial schematic view of the plug valve disclosed in the embodiment of the present application;

[0016] Figure 5 A structural schematic view of the first form of plug disclosed in the embodiment of the present application;

[0017] Figure 6 A structural schematic view of the second form of plug disclosed in the embodiment of the present application;

[0018] Figure 7 A structural schematic view of the third form of plug disclosed in the embodiment of the present application;

[0019] Figure 8 A force schematic view of the first form of valve seat disclosed in the embodiment of the present application;

[0020] Figure 9 A force schematic view of the second form of valve seat disclosed in the embodiment of the present application.

[0021] BRIEF DESCRIPTION OF DRAWINGS

[0022] 10- valve seat;

[0023] 11- valve seat body; 111- arc surface; 112- flow channel hole; 113- first groove; 114- sink; 115- second groove; 116- third groove; 117- recessed groove; 118- annular protrusion;

[0024] 20 - valve body; 21 - valve cavity; 211 - annular groove;

[0025] 30 - plug;

[0026] 41 - first sealing member; 42 - second sealing member;

[0027] 50 - elastic member. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a category, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the objects before and after are in a "or" relationship.

[0030] The embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments and their application scenarios.

[0031] Reference Figures 1 to 9 The embodiments of the present application disclose a valve seat 10, which can be applied to a plug valve to support and seal the plug 30 through the valve seat 10. The disclosed valve seat 10 includes a valve seat body 11.

[0032] The valve seat body 11 can be cylindrical. It should be noted that the valve seat body 11 has a certain thickness along its own axial direction, and the valve seat body 11 is provided with a flow channel hole 112 for passing fluid, so that the valve seat body 11 has a cylindrical structure. Alternatively, the valve seat body 11 can be a cylindrical structure, a polygonal prism cylindrical structure, an elliptical cylindrical structure, etc., of course, it can also be other forms, which are not specifically limited here.

[0033] To achieve a seal between the valve seat 10 and the plug valve 30, one end of the valve seat body 11 along the axial direction of the valve seat 10 may be provided with an arc surface 111. This arc surface 111 is used to mate with the plug valve 30 of the plug valve. In this way, the arc surface 111 can both support the plug valve 30 and achieve a good seal through its mating with the outer wall of the plug valve 30, preventing fluid leakage from between the outer wall of the plug valve 30 and the arc surface 111. It should be noted that by providing the arc surface 111, the valve seat body 11 can be tightly fitted to the outside of the plug valve 30, thereby providing good support and sealing for the plug valve 30.

[0034] Optionally, the arc surface 111 can be a circular arc surface or a non-circular arc surface, such as an elliptical arc surface.

[0035] One end of the flow channel hole 112 passes through the arc surface 111 at one end of the valve seat body 11 along the axial direction of the valve seat 10, and the other end of the flow channel hole 112 passes through the other end of the valve seat body 11 along the axial direction. In this way, the channel of the plug 30 can be connected to the channel of the valve body 20 through the flow channel hole 112 so that fluid can pass through.

[0036] In this embodiment, the valve seat 10 has a cylindrical valve seat body 11, and one end of the valve seat body 11 along the axial direction is provided with an arc surface 111. This arc surface 111 can cooperate with the plug 30 to achieve a seal on the outer wall of the plug 30. By providing a flow channel hole 112, fluid can flow through when the plug 30 is opened. Compared with the sealing arc plate used in related technologies to seal between the plug 30 and the valve body 20, the valve seat 10 in this embodiment has a larger axial dimension, making it less prone to deformation when subjected to large loads. This provides stable support for the plug 30 and effectively prevents the valve seat 10 from deforming, which could lead to seal failure between the valve seat 10 and the plug 30. Furthermore, the design requirements for the valve seat 10 are relatively low, and it does not require very high surface quality and dimensional accuracy, thereby reducing process complexity and processing costs.

[0037] refer to Figure 3 In some embodiments, the inner wall of the flow channel hole 112 may be provided with a first groove 113, which is used to install a disassembly tool. It should be noted that since the valve seat 10 is installed inside the valve body 20, it is not easily disassembled. Therefore, when it is necessary to remove the valve seat 10 from the valve body 20, the disassembly tool can be inserted through the flow channel hole 112 into the first groove 113, and the disassembly tool can be engaged with the groove wall of the first groove 113. Thus, by applying force to the disassembly tool, the valve seat 10 can be removed from the valve body 20, thereby improving the disassembly efficiency of the valve seat 10 and reducing the difficulty of disassembling the valve seat 10.

[0038] In some specific embodiments, the dismounting tool can be a pulling tool, by which the valve seat 10 can be pulled and dismounted from the valve body 20 by being assembled to the first groove 113.

[0039] Optionally, the first groove 113 can be arranged on the inner wall of the flow passage hole 112 along the circumference of the valve seat 10, so that the first groove 113 can be a fan-shaped groove or a ring-shaped groove.

[0040] When the first groove 113 is a fan-shaped groove, one or more first grooves 113 can be arranged along the circumference of the valve seat 10, which can be set according to actual needs.

[0041] Reference Figures 1 to 3 In some embodiments, the outer circumferential surface of the valve seat body 11 can be provided with a sunken platform 114, which is close to the area of the other end of the valve seat body 11 and extends along the circumference of the valve seat 10. The sunken platform 114 is used for mating connection with the inner cavity of the valve body 20 of the plug valve. It should be noted that the surface of the sunken platform 114 is lower than the outer circumferential surface of the valve seat body 11, so as to reduce the cross-sectional area of the valve seat body 11 at the sunken platform 114, thereby installing the valve seat body 11 to the inner cavity of the valve body 20.

[0042] In addition, the connecting surface between the surface of the sunken platform 114 and the outer circumferential surface of the valve seat body 11 can abut against the inner cavity wall of the valve body 20, so that the valve seat 10 can be limited in the axial direction to prevent the valve seat 10 from moving randomly under the extrusion of the plug valve, thereby ensuring the stability of the valve seat 10.

[0043] Optionally, a circle of sunken platforms 114 can be arranged on the outer circumferential surface of the valve seat body 11, and of course, the sunken platforms 114 can also be arranged on the local area of the outer circumferential surface, which can be set according to actual needs.

[0044] Continuing to refer to Figures 1 to 3 In some embodiments, the sunken platform 114 can be provided with a second groove 115 at the area close to the other end of the valve seat body 11, which extends along the circumference of the valve seat 10 and is used for installing the first sealing member 41. Based on this, after the valve seat 10 is installed to the inner cavity of the valve body 20, the circumferential sealing between the valve seat 10 and the inner cavity wall of the valve body 20 can be realized by the first sealing member 41, thereby effectively preventing fluid leakage.

[0045] Optionally, one or more second grooves 115 can be arranged on the surface of the sunken platform 114 and close to the area of the other end of the valve seat body 11, and correspondingly, each second groove 115 is respectively provided with a first sealing member 41, so as to improve the circumferential sealing between the valve seat 10 and the valve body 20.

[0046] Reference Figure 3In some embodiments, the end face of the valve seat body 11 at the other axial end can be provided with a third groove 116 extending along the circumference of the valve seat 10 and surrounding the outer periphery of the flow passage hole 112, which is used to mount the second sealing member 42. Based on this, after the valve seat 10 is mounted to the inner cavity of the valve body 20, the axial sealing between the valve seat 10 and the inner cavity wall of the valve body 20 can be achieved by the second sealing member 42, effectively preventing fluid leakage.

[0047] Optionally, the third groove 116 can be one or more, and of course when the third groove 116 is multiple, the multiple third grooves 116 can be arranged in sequence from inside to outside, so that multiple seals can be formed, further improving the sealing performance.

[0048] Reference Figure 1 In some embodiments, the inner wall of the flow passage hole 112 can be provided with a plurality of recess grooves 117 arranged in sequence along the circumference of the inner wall of the flow passage hole 112, and one end of each recess groove 117 penetrates the arc surface 111. Based on the arrangement of the plurality of recess grooves 117, the same can be used to mount and dismount tools to facilitate the dismounting of the valve seat 10.

[0049] Optionally, the cross section of the recess groove 117 can be arc-shaped or polygonal, such as semicircular arc-shaped, semicircular arc-shaped, rectangular, etc.

[0050] Reference Figure 6 In some more specific embodiments, the arc surface 111 can be a cylindrical arc surface, and correspondingly, the outer wall of the plug 30 can be a cylindrical surface. In this case, the diameter of the arc surface 111 can be greater than or equal to the diameter of the plug 30, so that the arc surface 111 can be tightly fitted with the outer wall of the plug 30, thereby improving the sealing performance between the arc surface 111 and the plug 30, preventing fluid leakage problems.

[0051] Reference Figure 5 In other more specific embodiments, the arc surface 111 can be a conical arc surface, and correspondingly, the outer wall of the plug 30 can be a conical surface. In this case, the diameter of the arc surface 111 at each position is greater than or equal to the diameter of the plug 30 at the corresponding position. Based on this, the arc surface 111 can be tightly fitted with the outer wall of the plug 30, thereby improving the sealing performance between the arc surface 111 and the plug 30, preventing fluid leakage problems.

[0052] Optionally, according to functional requirements, a stepped cylindrical surface, a hole or the like structure can be provided on the plug 30, such as shown in Figure 6 and Figure 7 .

[0053] Based on the valve seat 10, the application further discloses a plug valve, which comprises a valve body 20, a plug 30, an elastic member 50 and the valve seat 10. The valve body 20 is provided with a valve cavity 21, the valve seat 10 is installed in the valve cavity 21, the elastic member 50 elastically connects the valve seat 10 and the valve body 20, and the plug 30 is arranged in the valve cavity 21 and rotationally cooperates with the arc surface 111.

[0054] Based on the above arrangement, under the elastic force of the elastic member 50, the arc surface 111 of the valve seat 10 can abut against the outer wall of the plug 30, so that the sealing property between the arc surface 111 and the outer wall of the plug 30 can be ensured. In addition, the channel of the plug 30 can be opposite to or dislocated from the flow passage hole 112 of the valve seat 10 by rotating the plug 30, so that the plug valve can be switched to the open state or the closed state.

[0055] Reference Figure 8 In some embodiments, the system pressure P is composed of a pushing force F1 generated by one side end surface of the valve seat 10, a pushing force F2 generated by the end surface sealing ring (i.e. the second sealing member 42) and an elastic force F3 of the elastic member 50; and the system pressure P also generates a pushing force F4 at the other end of the valve seat 10. Since the system pressure P is the same, the size relationship of F1 and F4 is related to the stress area.

[0056] When F1+F2+F3>F4, it indicates that the sum of the pushing force between the valve seat 10 and the plug 30 and the pushing force generated by the elastic member 50 and the second sealing member 42 can make the valve seat 10 abut against the plug 30, so as to ensure the sealing effect and avoid the fluid entering between the valve seat 10 and the plug 30.

[0057] When F1+F2+F3≤F4, in combination with the sealing grease or lubricating grease, the same good sealing effect can also be achieved to avoid the fluid entering between the valve seat 10 and the plug 30.

[0058] It should be noted that when the fluid enters between the valve seat 10 and the plug 30, the sealing effect will be affected and the plug 30 will be difficult to rotate. If the plug 30 is forcibly rotated, the sealing surface will be scratched.

[0059] Reference Figure 9 In another embodiment, the system pressure P is composed of a pushing force F1 generated by one side end surface of the valve seat 10 and a pushing force F2 generated by the end surface sealing ring (i.e. the second sealing member 42); the system pressure P generates a pushing force F3 at the other end of the valve seat 10. Since the system pressure is the same, the size relationship of F1 and F3 is related to the stress area, and obviously F1+F2>F3 can ensure that the valve seat 10 abuts against the plug 30, so as to ensure the sealing effect.

[0060] In some embodiments, the plug valve can further include the first sealing member 41 described above, which is sealingly connected between the outer circumferential surface of the valve seat 10 and the inner wall of the valve cavity 21, so as to ensure the sealing between the outer circumferential surface of the valve seat 10 and the inner wall of the valve cavity 21, and prevent fluid leakage.

[0061] In some other embodiments, the plug valve can further include the second sealing member 42 described above, which is sealingly connected between the axial end surface of the valve seat 10 and the inner wall of the valve cavity 21, so as to ensure the sealing between the axial end surface of the valve seat 10 and the inner wall of the valve cavity 21, and prevent fluid leakage.

[0062] With reference to Figure 2 , Figure 3 , Figure 8 and Figure 9 In some embodiments, the valve seat body 11 can be provided with an annular protrusion 118 on the end surface of the other end of the valve seat 10, and the inner wall of the valve cavity 21 can be provided with an annular groove 211, the annular protrusion 118 is embedded in the annular groove 211, and the outer wall of the annular protrusion 118 and the inner wall of the annular groove 211 are in clearance fit. Based on this, the annular protrusion 118 can be more easily installed into the annular groove 211, thereby reducing the difficulty of assembling the valve seat 10 and the valve body 20.

[0063] Optionally, the clearance can be in the range of 0.01mm to 0.03mm, for example, including 0.01mm, 0.015mm, 0.02mm, 0.025mm, 0.03mm, etc., and of course, can also be other values, which are not specifically limited here.

[0064] In summary, the embodiments of the present application replace the sealing arc piece type valve seat with the cylindrical valve seat 10, so that the shape of the valve seat 10 is more regular, and the machining precision is easier to guarantee, and the arc surface 111 cooperates with the plug 30 to form a sealing pair, so that the irregular contact between the valve seat 10 and the valve body 20 is replaced by the regular contact between the cylindrical surface and the cylindrical surface, thereby reducing the machining difficulty and more easily guaranteeing the sealing effect.

[0065] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the specific embodiments described above, which are only illustrative and not limiting, and those of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A valve seat, characterized in that, include: The cylindrical valve seat body (11); The valve seat body (11) has an arc surface (111) at one end along the axial direction of the valve seat (10), and the arc surface (111) is used to cooperate with the plug (30) of the plug valve. The valve seat body (11) is provided with a flow channel hole (112) for fluid to pass through. One end of the flow channel hole (112) passes through the arc surface (111) at one end of the valve seat body (11) along the axial direction, and the other end of the flow channel hole (112) passes through the other end of the valve seat body (11) along the axial direction. The valve seat body (11) has a third groove (116) on the end face of the other end along the axial direction. The third groove (116) extends circumferentially along the valve seat (10) and surrounds the outer periphery of the flow channel hole (112). The third groove (116) is used to install the second seal (42).

2. The valve seat according to claim 1, characterized in that, The inner wall of the flow channel hole (112) is provided with a first groove (113), which is used to install and disassemble tools.

3. The valve seat according to claim 1, characterized in that, The outer peripheral surface of the valve seat body (11) and the area near the other end of the valve seat body (11) are provided with a recess (114) extending circumferentially along the valve seat (10). The countersunk platform (114) is used to connect with the inner cavity of the valve body (20) of the plug valve.

4. The valve seat according to claim 3, characterized in that, The recess (114) has a second groove (115) extending circumferentially along the valve seat (10) in a region near the other end of the valve seat body (11), the second groove (115) being used to install the first seal (41).

5. The valve seat according to claim 1, characterized in that, The inner wall of the flow channel hole (112) is provided with a plurality of recessed grooves (117), and the plurality of recessed grooves (117) are arranged at intervals along the circumferential direction of the inner wall of the flow channel hole (112), and one end of each recessed groove (117) penetrates the arc surface (111).

6. The valve seat according to claim 1, characterized in that, The arc surface (111) is a cylindrical arc surface, and the diameter of the arc surface (111) is greater than or equal to the diameter of the plug (30) used to cooperate with the valve seat body (11); Alternatively, the arc surface (111) is a conical arc surface, and the diameter of the arc surface (111) at each location is greater than or equal to the diameter of the plug (30) used to cooperate with the valve seat body (11) at the corresponding position.

7. A plug valve, characterized in that, include: Valve body (20), plug (30), elastic element (50) and valve seat (10) as described in any one of claims 1 to 6; The valve body (20) is provided with a valve cavity (21), the valve seat (10) is installed in the valve cavity (21), the elastic element (50) elastically connects the valve seat (10) and the valve body (20), the plug (30) is provided in the valve cavity (21) and rotates with the arc surface (111).

8. The plug valve according to claim 7, characterized in that, The plug valve further includes a first sealing element (41), which is sealed between the outer peripheral surface of the valve seat (10) and the inner wall of the valve cavity (21); And / or, the plug valve further includes a second seal (42) that is sealingly connected between the axial end face of the valve seat (10) and the inner wall of the valve cavity (21).

9. The plug valve according to claim 7, characterized in that, The valve seat body (11) has an annular protrusion (118) on the end face of the other end along the axial direction. The inner wall of the valve cavity (21) is provided with an annular groove (211), and the annular protrusion (118) is embedded in the annular groove (211). The outer wall of the annular protrusion (118) is in clearance fit with the inner wall of the annular groove (211), wherein the clearance range is 0.01mm to 0.03mm.

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