Sealing arc piece and plug valve

Abstract

The sealing arc piece comprises a base body and a first sealing protrusion, the base body is provided with an inner arc face, an outer arc face opposite to the inner arc face and an arc piece runner hole communicating the inner arc face with the outer arc face, and the first sealing protrusion is arranged on the periphery of the arc piece runner hole and extends inwards out of the inner arc face. According to the technical scheme, the technical problems that a traditional plug valve is not easy to open and close and poor in sealing performance are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of oil extraction, and in particular to a sealing arc plate and a plug valve. Background Art

[0002] The plug valve is an important component for connecting the high-pressure manifold during cementing and fracturing operations in oil fields. The main structure of the plug valve includes the valve body, plug valve core and sealing arc piece. Through the rotation of the plug, the through hole on the plug valve core is connected or disconnected with the through hole on the valve body to realize the opening or closing of the plug valve. Among them, the sealing arc piece is the core accessory of the plug valve, and its pressure bearing capacity and erosion resistance are the key to the quality of the plug valve.

[0003] In the related art, the inner arc surface of the sealing arc sheet is generally directly abutted against the outer wall surface of the plug, which makes it difficult for the plug to be separated from the sealing arc sheet under the action of pressure difference, resulting in great difficulty in rotating the plug and difficulty in opening and closing the plug valve; in addition, the sealing performance between the sealing arc sheet and the plug is poor. Utility Model Content

[0004] The present application provides a sealing arc sheet and a plug valve to solve the technical problems that a traditional plug valve is difficult to open and close and has poor sealing performance.

[0005] To this end, in the first aspect, an embodiment of the present application provides a sealing arc piece, including a base and a first sealing protrusion, the base is provided with an inner arc surface, an outer arc surface opposite to the inner arc surface, and an arc piece flow channel hole connecting the inner arc surface and the outer arc surface, the first sealing protrusion is arranged on the periphery of the arc piece flow channel hole and extends inward from the inner arc surface.

[0006] In a possible implementation, the inner arc surface includes a first sealing area, a second sealing area and a third sealing area, and the second sealing area and the third sealing area are respectively arranged on opposite sides of the first sealing area along the axial direction of the base.

[0007] In a possible implementation, in the radial direction of the substrate, the thickness of the second sealing area is less than or equal to the thickness of the first sealing area; and / or,

[0008] In the radial direction of the base body, the thickness of the third sealing area is less than or equal to the thickness of the first sealing area.

[0009] In a possible implementation, in the axial direction of the substrate, the further away from the first sealing area, the smaller the thickness of the second sealing area; and / or,

[0010] In the axial direction of the base body, the thickness of the third sealing area that is farther away from the first sealing area is smaller.

[0011] In a possible implementation manner, a second sealing protrusion is further included, and the second sealing protrusion is arranged at the periphery of the arc plate flow channel hole and extends outward from the outer arc surface.

[0012] In a possible implementation manner, a third sealing protrusion is further included. The third sealing protrusion is arranged on the outer arc surface with a spacing from the second sealing protrusion, and the third sealing protrusion is arranged on the periphery of the second sealing protrusion.

[0013] In a possible implementation, in the radial direction of the base body, the height of the second sealing protrusion is greater than or equal to the height of the third sealing protrusion; and / or,

[0014] In the radial direction of the base body, a projection area of ​​the first sealing protrusion is greater than or equal to the sum of projection areas of the second sealing protrusion and the third sealing protrusion.

[0015] In a possible implementation manner, a pressure groove for accommodating the elastic member is provided on the outer arc surface, and the pressure groove extends along the axial direction of the base body.

[0016] In a possible implementation, it further includes a hardness layer and a surface coating, wherein the hardness layer is arranged on the inner arc surface and / or the outer arc surface, and the surface coating is arranged on the outer surface of the hardness layer.

[0017] In the second aspect, the present application also provides a plug valve, including a valve body, a valve core and the sealing arc piece as described above, the inner arc surface of the sealing arc piece and the first sealing protrusion abut against the outer wall surface of the valve core, and the outer arc surface of the sealing arc piece abuts against the inner wall surface of the valve body.

[0018] According to the sealing arc piece and the plug valve provided in the embodiments of the present application, the sealing arc piece includes a base and a first sealing protrusion, the base is provided with an inner arc surface, an outer arc surface opposite to the inner arc surface, and an arc piece flow channel hole connecting the inner arc surface and the outer arc surface, the first sealing protrusion is arranged on the periphery of the arc piece flow channel hole and extends inwardly from the inner arc surface. The technical solution of the present application is to provide a first sealing protrusion on the periphery of the arc plate flow channel hole so that when the inner arc surface of the sealing arc plate abuts against the outer wall surface of the valve core, the first sealing protrusion abuts against the outer wall surface of the valve core, thereby reducing the contact area between the sealing arc plate and the valve core, increasing the contact stress between the inner arc surface and the valve core, and enhancing the sealing performance between the sealing arc plate and the valve core; and, when the first sealing protrusion abuts against the outer wall surface of the valve core, since the first sealing protrusion protrudes inwardly, it will form a gap between the inner arc surface close to the outer periphery of the first sealing protrusion and the outer wall surface of the valve core, and the gap can accommodate impurities between the valve core and the inner arc surface, thereby reducing the difficulty of opening and closing the plug valve and improving the operation convenience of the plug valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments that conform to the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor. One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a proportional limitation.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of the sealing arc sheet provided in an embodiment of the present application at a first viewing angle;

[0021] Figure 2 A schematic diagram of the three-dimensional structure of the sealing arc sheet provided in an embodiment of the present application at a second viewing angle;

[0022] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0023] Figure 4 A first exemplary front view of a sealing arc sheet provided in the present application;

[0024] Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure of the example;

[0025] Figure 6 A second example front view of the sealing arc sheet provided in the present application;

[0026] Figure 7 for Figure 6 Schematic diagram of the three-dimensional structure of the example;

[0027] Figure 8 A partial cross-sectional view of the plug valve provided in an embodiment of the present application along its axial direction;

[0028] Fig. 9 A partial cross-sectional view of the plug valve provided in an embodiment of the present application along its radial direction.

[0029] Description of reference numerals:

[0030] 100, base; 101, inner arc surface; 102, outer arc surface; 103, arc plate flow channel hole; 104, positioning pin hole; 105, pressure groove; 110, first sealing area; 120, second sealing area; 130, third sealing area;

[0031] 200, first sealing protrusion;

[0032] 300, second sealing protrusion; 301, first sealing groove;

[0033] 400, third sealing protrusion; 401, second sealing groove;

[0034] 500, hardness layer; 600, surface coating;

[0035] 10. Valve core; 20. Sealing arc piece. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0037] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can appreciate the applicability of other processes and / or the use of other materials.

[0038] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0039] See also Figures 1 to 9 The embodiment of the present application provides a sealing arc sheet, including a base body 100 and a first sealing protrusion 200. The base body 100 is provided with an inner arc surface 101, an outer arc surface 102 opposite to the inner arc surface 101, and an arc sheet flow channel hole 103 connecting the inner arc surface 101 and the outer arc surface 102. The first sealing protrusion 200 is arranged on the periphery of the arc sheet flow channel hole 103 and extends inwardly from the inner arc surface 101.

[0040] In this embodiment, a first sealing protrusion 200 is provided on the periphery of the arc plate flow channel hole 103, so that when the inner arc surface 101 of the sealing arc plate 20 abuts against the outer wall surface of the valve core 10, the first sealing protrusion 200 abuts against the outer wall surface of the valve core 10, thereby reducing the contact area between the sealing arc plate 20 and the valve core 10, increasing the contact stress between the inner arc surface 101 and the valve core 10, and enhancing the sealing performance between the sealing arc plate 20 and the valve core 10; and, when the first sealing protrusion 200 abuts against the outer wall surface of the valve core 10, since the first sealing protrusion 200 protrudes inward, it will form a gap between the inner arc surface 101 close to the outer periphery of the first sealing protrusion 200 and the outer wall surface of the valve core 10, and the gap can accommodate impurities between the valve core 10 and the inner arc surface 101, thereby reducing the difficulty of opening and closing the plug valve and improving the convenience of operating the plug valve.

[0041] Specifically, the sealing arc sheet 20 is configured as a composite component including at least a base 100 and a first sealing protrusion 200. The base 100 can be an arc-shaped sheet structure, and the inner arc surface 101 and the outer arc surface 102 arranged thereon are parallel to and do not overlap each other, that is, the inner arc surface 101 and the outer arc surface 102 are eccentrically arranged. In this way, when the valve core 10 is rotated, the sealing arc sheet 20 undergoes plastic deformation, so that a gap is generated between the inner arc surface 101 and the valve core 10, and between the outer arc surface 102 and the valve body. The gap can be used for the fluid medium to flow into, so that the valve core 10 and the sealing arc sheet 20 are connected. 0 is separated, which is convenient for the valve core 10 to rotate, effectively reducing the difficulty of opening and closing the plug valve, making the operation of the operator simple, saving time and effort; at the same time, the base body 100 is provided with an arc plate flow channel hole 103, which is horizontally arranged and used to cooperate with the valve core 10 flow channel hole on the valve core 10 that penetrates along its radial direction to realize the opening and closing of the plug valve; for example, when the valve core 10 flow channel hole is connected and connected with the arc plate flow channel hole 103, the plug valve is in an open state; when the valve core 10 flow channel hole is perpendicular to the arc plate flow channel hole 103, the plug valve is in a closed state. The first sealing protrusion 200 can be a special-shaped annular protrusion, which is protruding and arranged at the arc plate flow channel hole 103 of the inner arc surface 101, and is used to press against the outer wall surface of the valve core 10, improve the contact stress between the sealing arc plate 20 and the valve core 10, and strengthen the sealing performance of the periphery of the arc plate flow channel hole 103.

[0042] In addition, since the first sealing protrusion 200 protrudes inwardly from the inner arc surface 101, it will first abut against the outer wall surface of the valve core 10, so that a certain gap is generated between the valve core 10 and the inner arc surface 101. In addition, the sealing arc sheet 20 will be subjected to the inward extrusion force from the valve body, so that the inner arc surface 101 is closely attached to the outer wall surface of the valve core 10; on the other hand, the sealing arc sheet 20 as a whole will also be subjected to the outward extrusion force from the valve core 10, so that the outer wall surface of the valve core 10 is sealed and attached to the inner arc surface 101. In this way, the gap space brought by the first sealing protrusion 200 is controlled at the inner arc surface 101 near the periphery of the first sealing protrusion 200, and it is ensured that the other parts of the inner arc surface 101 are closely attached to the outer wall surface of the valve core 10, thereby improving the sealing performance of the plug valve on the inner arc surface 101 side. At the same time, the gap can accommodate impurities that appear between the valve core 10 and the inner arc surface 101 during the rotation process, reduce the difficulty of rotating the valve core 10, improve the convenience of opening and closing the plug valve, and prevent impurities from entering between the inner arc surface 101 and the outer wall of the valve core 10 to cause scratches and damage to the sealing arc piece 20 / valve core 10, further improve the sealing performance between the sealing arc piece 20 and the valve core 10, and extend the service life of the plug valve.

[0043] In one example, the substrate 100 may be made of metal with high hardness to achieve metal sealing between the valve core 10 and the valve body. For example, the substrate 100 may be made of alloy steel, carbon steel, cast iron or cast steel, etc. The specific material of the substrate 100 is not limited here, as long as it has high hardness.

[0044] In one example, a positioning pin hole 104 is provided at the bottom of the base 100, and the positioning pin hole 104 extends along the axial direction of the sealing arc piece 20, and is used to cooperate with the positioning pin to fix the sealing arc piece 20 on the valve body. It should be noted that the connection between the sealing arc piece 20 and the valve body is not fixed, and the sealing arc piece 20 can move within a small range to ensure that the valve core 10 is screwed in / out, so as to realize the normal operation of the plug valve.

[0045] In a possible implementation, the inner arc surface 101 includes a first sealing area 110 , a second sealing area 120 and a third sealing area 130 , and the second sealing area 120 and the third sealing area 130 are respectively arranged on opposite sides of the first sealing area 110 along the axial direction of the base body 100 .

[0046] In this embodiment, the specific configuration of the inner arc surface 101 is optimized. Specifically, the inner arc surface 101 is configured as a composite shape including at least a first sealing area 110, a second sealing area 120 and a third sealing area 130. The first sealing area 110 is used to form a seal with the outer wall surface of the valve core 10, and the first sealing protrusion 200 is arranged on the periphery of the arc plate flow channel hole 103 on the first sealing area 110; the second sealing area 120 and the third sealing area 130 are respectively arranged on opposite sides of the first sealing area 110 to form a gap there, which is convenient for loading or removing the valve core 10. The expansion area of ​​the first sealing area 110 is larger than the expansion area of ​​the second sealing area 120, and the expansion area of ​​the first sealing area 110 is larger than the expansion area of ​​the third sealing area 130. In this way, the sealing performance between the inner arc surface 101 and the valve core 10 can be ensured, and the loading / removal and rotation of the valve core 10 are facilitated, thereby improving the convenience of opening and closing the plug valve.

[0047] In a possible implementation, in the radial direction of the base 100, the thickness of the second sealing area 120 is less than or equal to the thickness of the first sealing area 110; and / or, in the radial direction of the base 100, the thickness of the third sealing area 130 is less than or equal to the thickness of the first sealing area 110. In this way, a gap can be formed between the second sealing area 120 and the outer wall surface of the valve core 10, and / or a gap can be formed between the third sealing area 130 and the outer wall surface of the valve core 10, and the gap can be used for the liquid medium to enter, so that the outer wall surface of the rotating valve core 10 leaves the inner arc surface 101, which is conducive to the rotation of the valve core 10 and improves the convenience of opening and closing of the plug valve.

[0048] In a possible implementation, in the axial direction of the base 100, the further away from the first sealing area 110, the smaller the thickness of the second sealing area 120; and / or, in the axial direction of the base 100, the further away from the first sealing area 110, the smaller the thickness of the third sealing area 130. In this way, the second sealing area 120 and the third sealing area 130 can be arranged in an inclined surface, and when the second sealing area 120 and the third sealing area 130 abut against the valve core 10, they form a wedge-shaped gap with the outer wall surface of the valve core 10, and the wedge-shaped gap facilitates the installation and removal of the valve core 10, and also facilitates the rotation of the valve core 10, thereby enhancing the convenience of opening and closing the plug valve.

[0049] In a possible implementation manner, a second sealing protrusion 300 is further included. The second sealing protrusion 300 is disposed at the periphery of the arc sheet flow channel hole 103 and extends outward from the outer arc surface 102 .

[0050] In this embodiment, the specific configuration of the sealing arc sheet 20 is further optimized. Specifically, the sealing arc sheet 20 is configured as a composite component including at least a base 100, a first sealing protrusion 200 and a second sealing protrusion 300. The second sealing protrusion 300 can be a special-shaped annular protrusion, which is protruding and configured at the arc sheet flow channel hole 103 of the outer arc surface 102, and is used to press against the inner wall surface of the valve body, improve the contact stress between the sealing arc sheet 20 and the valve body, and strengthen the sealing performance of the periphery of the arc sheet flow channel hole 103. In this example, a sealing protrusion structure is provided on the side of the outer arc surface 102 to improve the sealing performance between the outer arc surface 102 and the inner wall of the valve body. At the same time, it is conducive to the rotation of the plug valve, and it is convenient for operators to open or close the plug valve.

[0051] Furthermore, since the second sealing protrusion 300 protrudes outward from the outer arc surface 102, it will first abut against the inner wall surface of the valve body, so that a certain gap is generated between the valve body and the outer arc surface 102. Based on this, the sealing arc sheet 20 will be subjected to the outward extrusion force from the valve core 10, so that the outer arc surface 102 is sealed against the inner wall surface of the valve body; on the other hand, the sealing arc sheet 20 as a whole will also be constrained by the valve body, so that the outer arc surface 102 is closely attached to the inner wall surface of the valve body, so that the gap space brought by the second sealing protrusion 300 is controlled at the outer arc surface 102 near the periphery of the second sealing protrusion 300, and at the same time, it is ensured that the other parts of the outer arc surface 102 are closely attached to the inner wall surface of the valve body, thereby improving the sealing performance of the plug valve on the outer arc surface 102 side. At the same time, the gap can accommodate impurities that appear between the valve body and the outer arc surface 102 during the rotation process, reduce the difficulty of rotational deformation of the sealing arc piece 20, improve the sealing performance of the plug valve, and prevent impurities from entering between the inner arc surface 101 and the outer wall surface of the valve core 10 to cause scratches and damage to the sealing arc piece 20 / valve core 10, thereby extending the service life of the plug valve.

[0052] In a possible implementation manner, a third sealing protrusion 400 is further included. The third sealing protrusion 400 is arranged on the outer arc surface 102 with a spacing from the second sealing protrusion 300 , and the third sealing protrusion 400 is arranged on the periphery of the second sealing protrusion 300 .

[0053] In this embodiment, the specific configuration of the sealing arc sheet 20 is further optimized. Specifically, the sealing arc sheet 20 is configured as a composite component including at least a base 100, a first sealing protrusion 200, a second sealing protrusion 300 and a third sealing protrusion 400. The third sealing protrusion 400 can be a special-shaped annular protrusion, which is protruded on the outer periphery of the second sealing protrusion 300 of the outer arc surface 102, and is used to press against the inner wall surface of the valve body, further improving the sealing performance between the sealing arc sheet 20 and the valve body. The third sealing protrusion 400 protrudes outward from the outer arc surface 102, and its shape is generally similar to that of the second sealing protrusion 300, and its size is larger than that of the second sealing protrusion 300. In this example, two layers of sealing structures are provided on the outer arc surface 102 to improve the sealing performance between the outer arc surface 102 and the inner wall surface of the valve body at least in terms of quantity.

[0054] In one example, a first sealing groove 301 is provided between the second sealing protrusion 300 and the third sealing protrusion 400, and the first sealing groove 301 can accommodate the first sealing ring to further enhance the sealing performance between the second sealing protrusion 300 and the third sealing protrusion 400. In addition, a second sealing groove 401 is further provided on the outer periphery of the third sealing protrusion 400, and the second sealing groove 401 can accommodate the second sealing ring to further enhance the sealing performance of the outer periphery of the third sealing protrusion 400.

[0055] In a possible implementation, in the radial direction of the base 100, the height of the second sealing protrusion 300 is greater than or equal to the height of the third sealing protrusion 400. In this configuration, the inner wall surface of the valve body can first abut against the second sealing protrusion 300, increase the contact stress between the outer arc surface 102 and the valve body, and improve the sealing performance between the outer arc surface 102 and the valve body; or, the inner wall surface of the valve body can abut against the second sealing protrusion 300 and the third sealing protrusion 400 at the same time, increase the contact area between the outer arc surface 102 and the inner wall surface of the valve body, expand the area of ​​the sealing area, reduce the wear between the sealing arc sheet 20 and the valve body, and extend the service life of the sealing arc sheet 20.

[0056] In one example, the width of the third sealing protrusion 400 is less than or equal to the width of the second sealing protrusion 300, so that when the second sealing protrusion 300 is pressed against the inner wall of the valve body, the sealing performance between the sealing arc sheet 20 and the valve body is ensured; and the rotational wear of the second sealing protrusion 300 can be minimized to extend the service life of the sealing arc sheet 20. This example is applicable to the case where the height of the second sealing protrusion 300 is greater than the height of the third sealing protrusion 400, in which case, only the second sealing protrusion 300 is pressed against the inner wall of the valve body.

[0057] In a possible implementation, in the radial direction of the base 100, the projection area of ​​the first sealing protrusion 200 is greater than or equal to the sum of the projection areas of the second sealing protrusion 300 and the third sealing protrusion 400. This arrangement can make the inner and outer sides of the sealing arc sheet 20 near the arc sheet flow channel hole 103 evenly stressed, thereby extending the service life of the sealing arc sheet 20.

[0058] In a possible embodiment, a pressure groove 105 for accommodating an elastic member is provided on the outer arc surface 102, and the pressure groove 105 extends along the axial direction of the base 100. In this way, an elastic member such as a spring can be installed in the pressure groove 105, so that the elastic member can provide the sealing arc sheet 20 with pressure to be close to the outer wall surface of the valve core 10, thereby further improving the sealing performance between the sealing arc sheet 20 and the valve core 10; at the same time, it can also prevent impurities in the liquid medium from entering between the sealing arc sheet 20 and the valve core 10, thereby improving the protection of the sealing arc sheet 20 and the valve core 10. Specifically, the pressure groove 105 can be a long strip groove, and two of them can be configured. The two pressure grooves 105 are arranged at the edges of the opposite sides of the outer arc surface 102. At this time, two elastic members are configured, and one elastic member is assembled in one pressure groove 105, so that the force on the sealing arc sheet 20 is uniform, and the sealing arc sheet 20 is close to the valve core 10.

[0059] See also Figures 4 to 7 In a possible implementation, it further includes a hardness layer 500 and a surface coating 600 , the hardness layer 500 is disposed on the inner arc surface 101 and / or the outer arc surface 102 , and the surface coating 600 is disposed on the outer surface of the hardness layer 500 .

[0060] In this embodiment, the specific configuration of the sealing arc sheet 20 is further optimized. Specifically, the sealing arc sheet 20 is configured as a composite component including at least a substrate 100, a first sealing protrusion 200, a hardness layer 500 and a surface coating 600. The hardness layer 500 may be an alloy layer, which is configured on the outside of the substrate 100 to enhance the hardness and strength of the substrate 100 and improve the wear resistance and corrosion resistance of the sealing arc sheet 20; the surface coating 600 may be configured on the outside of the hardness layer 500 to protect the substrate 100 and the hardness layer 500, and at the same time, the running-in, wear resistance, anti-seizure and friction compliance of the sealing arc sheet 20 may be increased.

[0061] It is understandable that the operator can select the specific number of layers of the hardness layer 500 and the surface coating 600 according to actual needs. For example, one hardness layer 500 and one surface coating 600 can be set to simplify the production process and improve the processing efficiency of the sealing arc piece 20; two or more hardness layers 500 and one surface coating 600 can be set to enhance the hardness and pressure bearing capacity of the sealing arc piece 20 and improve the performance of the sealing arc piece 20; two or more hardness layers 500 and two or more surface coatings 600 can also be set to further improve the wear resistance of the sealing arc piece 20.

[0062] In one example, the material of the hardness layer 500 can be any one of babbitt alloy, aluminum-based alloy, nickel-phosphorus alloy, tungsten-based alloy or cobalt-based alloy or a combination thereof. The hardness layer 500 can improve the mechanical strength and wear resistance, corrosion resistance and other properties of the sealing arc sheet 20, and can effectively solve the problems of poor wear resistance and corrosion resistance of the traditional sealing arc sheet 20.

[0063] In one example, the material of the surface coating 600 can be any one of polyimide, polyethylene (PE), polypropylene (PP), polystyrene (PS), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), nylon (Nylon), polycarbonate (PC), polyurethane (PU), polyethylene terephthalate (PET, PETE) or a combination thereof. The surface coating 600 has certain anti-corrosion performance, friction reduction performance, wear resistance, anti-seizure performance, friction compliance performance, embedding performance and running-in performance, etc., so as to reduce the damage of impurities in the liquid medium to the sealing arc sheet 20, and realize the protection of the hardness layer 500 and the substrate 100, thereby extending the service life of the sealing arc sheet 20.

[0064] The surface coating 600 can be provided on the hardness layer 500 by spraying, electroplating, chemical plating, plastic spraying or vapor deposition. For example, when chemical plating is used to provide the surface coating 600 on the substrate 100, the workpiece needs to be cleaned first to completely remove the oil, oxides, scale and other dirt on the surface of the arc piece. Here, alkaline cleaning solution cleaning, ultrasonic cleaning, pickling or a variety of composite cleaning methods can be used for the first cleaning, and then the second cleaning is performed with clean water to completely remove all the chemical substances remaining on the surface of the workpiece; after the cleaning is completed, the workpiece is immersed in hot water for preheating so that the temperature of the workpiece is close to the temperature of the plating solution; finally, the workpiece is placed in the plating solution for chemical plating. At this time, the plating solution temperature must be ensured to be uniform, and the plating solution must be replenished in time as needed to ensure the smooth plating of the surface coating 600.

[0065] In addition, see Figure 8 and Fig. 9 The present application also provides a plug valve, including a valve body (not shown), a valve core 10 and the above-mentioned sealing arc sheet 20, the inner arc surface 101 of the sealing arc sheet 20 and the first sealing protrusion 200 abut against the outer wall surface of the valve core 10, and the outer arc surface 102 of the sealing arc sheet 20 abuts against the inner wall surface of the valve body. The specific structure of the sealing arc sheet 20 refers to the above-mentioned embodiment. Since the plug valve adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0066] In this embodiment, an eccentric sealing arc piece 20 is provided between the valve core 10 and the valve body to avoid direct contact between the valve core 10 and the valve body, thereby reducing wear between the valve core 10 and the valve body, which is beneficial to extending the service life of the plug valve. In addition, by providing a first sealing protrusion 200 on the inner arc surface 101 of the sealing arc sheet 20, when the valve core 10 abuts against the sealing arc sheet 20, the first sealing protrusion 200 abuts against the outer wall surface of the valve core 10, thereby reducing the contact area between the sealing arc sheet 20 and the valve core 10, increasing the contact stress between the inner arc surface 101 and the valve core 10, and enhancing the sealing performance between the sealing arc sheet 20 and the valve core 10; and, when the first sealing protrusion 200 abuts against the outer wall surface of the valve core 10, since the first sealing protrusion 200 protrudes inward, a gap is formed between the inner arc surface 101 close to the outer periphery of the first sealing protrusion 200 and the outer wall surface of the valve core 10, and the gap can accommodate impurities between the valve core 10 and the inner arc surface 101, thereby reducing the difficulty of opening and closing the plug valve and improving the convenience of operating the plug valve.

[0067] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0068] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0069] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A sealing arc sheet, characterized in that: It includes a base and a first sealing protrusion, the base is provided with an inner arc surface, an outer arc surface opposite to the inner arc surface, and an arc plate flow channel hole connecting the inner arc surface and the outer arc surface, the first sealing protrusion is arranged on the periphery of the arc plate flow channel hole and extends inwardly from the inner arc surface.

2. The sealing arc sheet according to claim 1, characterized in that: The inner arc surface includes a first sealing area, a second sealing area and a third sealing area. The second sealing area and the third sealing area are respectively arranged on opposite sides of the first sealing area along the axial direction of the base body.

3. The sealing arc sheet according to claim 2, characterized in that: In the radial direction of the substrate, the thickness of the second sealing area is less than or equal to the thickness of the first sealing area; and / or, In the radial direction of the base body, the thickness of the third sealing area is less than or equal to the thickness of the first sealing area.

4. The sealing arc sheet according to claim 3, characterized in that: In the axial direction of the base body, the thickness of the second sealing area is smaller as it is farther away from the first sealing area; and / or, In the axial direction of the base body, the thickness of the third sealing area becomes smaller as it becomes farther away from the first sealing area.

5. The sealing arc sheet according to claim 1, characterized in that: It also includes a second sealing protrusion, which is arranged on the periphery of the arc plate flow channel hole and extends outward from the outer arc surface.

6. The sealing arc sheet according to claim 5, characterized in that: It also includes a third sealing protrusion, which is arranged on the outer arc surface with a spacing from the second sealing protrusion, and the third sealing protrusion is arranged on the periphery of the second sealing protrusion.

7. The sealing arc sheet according to claim 6, characterized in that: In the radial direction of the base body, the height of the second sealing protrusion is greater than or equal to the height of the third sealing protrusion; and / or, In the radial direction of the base body, a projection area of ​​the first sealing protrusion is greater than or equal to the sum of projection areas of the second sealing protrusion and the third sealing protrusion.

8. The sealing arc sheet according to claim 1, characterized in that: The outer arc surface is provided with a pressure groove for accommodating the elastic member, and the pressure groove extends along the axial direction of the base.

9. The sealing arc sheet according to claim 1, characterized in that: It also includes a hardness layer and a surface coating, wherein the hardness layer is arranged on the inner arc surface and / or the outer arc surface, and the surface coating is arranged on the outer surface of the hardness layer.

10. A plug valve, characterized in that: It comprises a valve body, a valve core and a sealing arc sheet as described in any one of claims 1 to 9, wherein the inner arc surface of the sealing arc sheet and the first sealing protrusion abut against the outer wall surface of the valve core, and the outer arc surface of the sealing arc sheet abuts against the inner wall surface of the valve body.

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