stopcock valve

Abstract

The application provides a cock valve, which comprises a valve body, a valve core and a sealing arc piece, the valve body is provided with a mounting cavity, the valve core is arranged in the mounting cavity, the sealing arc piece is arranged between the inner wall of the mounting cavity and the valve core, the sealing arc piece comprises a first sealing surface and a second sealing surface which are oppositely arranged along a first direction, the inner wall of the mounting cavity, the first sealing surface, the second sealing surface and the valve core are sequentially arranged, the diameter size of the first sealing surface is greater than the diameter size of the inner wall of the mounting cavity, and the diameter size of the second sealing surface is greater than the diameter size of the outer wall of the valve core. Based on the size matching of the sealing arc piece, the valve body and the valve core, the cock valve can reduce internal vibration, reduce the adverse effects caused by the impact between the sealing arc piece and the valve body and the valve core, the sealing arc piece and the valve core can stably maintain good sealing performance for a long time, and the performance of the cock valve is more stable.

Description

Technical Field

[0001] This application relates to the field of valve technology, specifically to a plug valve. Background Technology

[0002] Plug valves are important components for connecting high-pressure manifolds during cementing and fracturing operations in oilfields. The main structure of a plug valve includes a valve body, a valve core, and sealing arcs. By rotating the valve core, the flow passage of the valve core is connected or disconnected from the flow passage of the valve body, thereby opening or closing the plug valve.

[0003] Due to factors such as the working environment and structural design of plug valves, components of plug valves using related technologies are prone to damage or malfunction, requiring frequent maintenance or replacement and hindering long-term stable operation. Therefore, there is an urgent need for a plug valve with better stability. Utility Model Content

[0004] The purpose of this application is to provide a plug valve that can operate stably and reduce the maintenance cost of the plug valve.

[0005] To address the aforementioned problems, this application provides a plug valve, comprising: The valve body has a mounting cavity; The valve core is disposed within the mounting cavity; and A sealing arc plate is disposed within the mounting cavity and located between the inner wall of the mounting cavity and the valve core. The sealing arc plate includes a first sealing surface and a second sealing surface disposed opposite to each other along a first direction. The inner wall of the mounting cavity, the first sealing surface, the second sealing surface, and the valve core are arranged sequentially. The diameter of the first sealing surface is larger than the diameter of the inner wall of the mounting cavity, and the diameter of the second sealing surface is larger than the diameter of the outer wall of the valve core.

[0006] Optionally, the two side edges of the first sealing surface contact the inner wall of the mounting cavity, and a gap is formed between the middle area of ​​the first sealing surface and the inner wall of the mounting cavity. The two side edges of the second sealing surface are spaced apart from the outer wall of the valve core, and the middle area of ​​the second sealing surface is in contact with the outer wall of the valve core.

[0007] Optionally, when the diameter of the inner wall of the mounting cavity is in the range of 0 to 100 mm, the difference between the diameter of the first sealing surface and the diameter of the inner wall of the mounting cavity does not exceed 0.25 mm; when the diameter of the inner wall of the mounting cavity is in the range of 100 to 200 mm, the difference between the diameter of the first sealing surface and the diameter of the inner wall of the mounting cavity does not exceed 0.5 mm; or, When the diameter of the outer wall of the valve core is in the range of 0 to 100 mm, the difference between the diameter of the second sealing surface and the diameter of the outer wall of the valve core shall not exceed 0.1 mm; when the diameter of the outer wall of the valve core is in the range of 100 to 200 mm, the difference between the diameter of the second sealing surface and the diameter of the outer wall of the valve core shall not exceed 0.2 mm.

[0008] Optionally, the sealing arc sheet further includes a first flow channel hole penetrating the first sealing surface and the second sealing surface; The valve core includes a second flow channel hole and a first protrusion structure arranged at intervals. The second flow channel hole is used to communicate with or be offset from the first flow channel hole, and the first protrusion structure is provided and protrudes from the outer wall of the valve core. When the second flow channel hole and the first flow channel hole are misaligned, the first protrusion structure abuts against the area surrounding the first flow channel hole on the second sealing surface.

[0009] Optionally, the edge of the first flow channel hole near the second sealing surface is connected to the second sealing surface through a chamfered structure or a beveled structure.

[0010] Optionally, the valve core further includes a bottom surface disposed at one end of the outer wall of the valve core, and a second protrusion structure disposed thereon and protruding from the bottom surface in a second direction, the second direction being perpendicular to the first direction; The plug valve further includes a gland, which is disposed on one side of the bottom surface along the second direction, and the gland is used to abut against the second protruding structure.

[0011] Optionally, the valve core further includes a bottom surface disposed at the end of the outer wall of the valve core; The plug valve further includes a gland, which has a third protrusion structure protruding from the gland along a second direction. The third protrusion structure is used to abut against the bottom surface of the valve core, and the second direction is perpendicular to the first direction.

[0012] Optionally, the plug valve further includes a plug rod connected to the valve core and capable of driving the valve core to rotate; The valve core further includes a top surface disposed at the other end of the outer wall of the valve core, and a fourth protrusion structure disposed thereon and protruding from the top surface in a second direction, the second direction being perpendicular to the first direction; The fourth protrusion is configured to contact the stopcock and to space the top surface from the valve body.

[0013] Optionally, the valve core further includes a top surface disposed at the other end of the outer wall of the valve core; The plug valve further includes a plug rod connected to the valve core and capable of driving the valve core to rotate. The plug rod includes a first part and a second part connected sequentially along a second direction. The second part is located on the side of the first part away from the valve core, and the second direction is perpendicular to the first direction. The stopcock is configured such that the first portion contacts the top surface and the second portion is spaced apart from the valve body.

[0014] Optionally, the valve core further includes a first end and a second end, which are disposed opposite to each other along a second direction and respectively connected to the outer wall of the valve core, wherein the second direction is perpendicular to the first direction; wherein, The diameter of the first end is smaller than the diameter of the outer wall of the valve core; and / or, the diameter of the second end is smaller than the diameter of the outer wall of the valve core.

[0015] Optionally, at least one of the first end and the second end is connected to the outer wall of the valve core via a chamfered structure; or, The diameter of at least one of the first end and the second end is smaller the further away from the outer wall of the valve core.

[0016] Optionally, the second sealing surface is provided with a first groove recessed in the direction toward the first sealing surface; and / or, The second sealing surface is further provided with a first sealing groove recessed in the direction of the first sealing surface. The plug valve also includes a first sealing element, which is disposed in the first sealing groove and is used to abut against the second sealing surface and the outer wall of the valve core.

[0017] Optionally, the sealing arc plate further includes a first flow channel hole; the second sealing surface includes a first region and a second region, the first region being disposed along the periphery of the first flow channel hole and protruding from the second region in the direction toward the valve core.

[0018] Optionally, the second region includes two first sub-regions and / or two second sub-regions; The two first sub-regions are located on opposite sides of the first region, and the thickness of the first sub-region is smaller the further away from the first region. The two second sub-regions are located on opposite sides of the first region, and the thickness of the second sub-regions is smaller the further away from the first region.

[0019] Optionally, the second region includes two first sub-regions and / or two second sub-regions; The two first sub-regions are located on opposite sides of the first region, and the two second sub-regions are located on the other opposite sides of the first region; Each of the first sub-regions is connected to the first region with rounded corners; each of the second sub-regions is connected to the first region with rounded corners.

[0020] Optionally, the first sealing surface is further provided with a second sealing groove recessed toward the second sealing surface, and the plug valve further includes a second sealing element, which is disposed in the second sealing groove and abuts against the inner wall of the mounting cavity.

[0021] Optionally, the first sealing surface further includes a receiving groove communicating with the second sealing groove. In the first direction, the receiving groove is located between the edges of the second sealing groove and the sealing arc plate. The bottom of the receiving groove also includes a second recessed groove facing the second sealing surface. A portion of the second seal is disposed within the second sealing groove, and another portion of the second seal is disposed within the receiving groove and covers a portion of the second groove.

[0022] Optionally, the second seal includes a ring seal structure.

[0023] Optionally, the sealing arc sheet further includes an end face that is connected to the first sealing surface and the second sealing surface respectively. The sealing arc sheet also includes a limiting cavity, which is formed by the end face extending along a second direction perpendicular to the first direction. The limiting cavity is used to accommodate a part of the limiting member for connection to the valve body through the limiting member. The limiting cavity includes: a groove structure spaced apart from the edge of the end face, or a groove structure connected to the edge of the end face near the first sealing surface or the second sealing surface, or a groove structure connected to the edge of the end face near the first sealing surface and the second sealing surface.

[0024] Based on the above technical solution, the sealing arc and valve core of the plug valve of this application are both disposed within the mounting cavity of the valve body. The sealing arc is located between the inner wall of the mounting cavity and the valve core, such that the inner wall of the mounting cavity, the first sealing surface, the second sealing surface, and the valve core are arranged sequentially. When the diameter of the first sealing surface is larger than the diameter of the inner wall of the mounting cavity, and the diameter of the second sealing surface is larger than the diameter of the outer wall of the valve core, the first sealing surface is not completely fitted with the inner wall of the mounting cavity, and the second sealing surface is not completely fitted with the outer wall of the valve core. An elastic buffer zone can be formed between the sealing arc and the inner wall of the mounting cavity. The elastic buffer zone can buffer the collision between the valve body, the valve core, and the sealing arc, reducing the collision wear of the surface coating of the valve core and the sealing arc. The sealing arc and the valve core can maintain good sealing performance stably for a long time, eliminating the need for frequent replacement and maintenance of the sealing arc and the valve core. This greatly improves the performance stability and service life of the plug valve and reduces the maintenance cost of the plug valve. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a plug valve provided in an embodiment of this application; Figure 2 A partial schematic diagram of a plug valve provided in an embodiment of this application; Figure 3 for Figure 2 A cross-sectional view of the plug valve shown; Figure 4 This is a schematic diagram of a first structure of the valve core provided in an embodiment of this application; Figure 5 for Figure 4 A schematic diagram of the valve core in another direction; Figure 6 for Figure 4 The diagram shows a combination of a valve core and a sealing arc plate. Figure 7 for Figure 4 The diagram shows another direction in which the valve core and the sealing arc plate cooperate; Figure 8 This is a schematic diagram of a first structure of the sealing arc sheet provided in the embodiments of this application; Figure 9 This is a schematic diagram of a second structure of the valve core provided in an embodiment of this application; Figure 10 This is a schematic diagram of a third structure of the valve core provided in an embodiment of this application; Figure 11 This is a schematic diagram of a first structure of the pressure cap provided in an embodiment of this application; Figure 12 for Figure 11 A cross-sectional view of the pressure cap shown; Figure 13 This is a schematic diagram of a second structure of the pressure cap provided in an embodiment of this application; Figure 14 for Figure 13 A cross-sectional view of the pressure cap shown; Figure 15 This is a schematic diagram of a plug rod provided in an embodiment of this application; Figure 16 This is a schematic diagram of a fourth structure of the valve core provided in the embodiments of this application; Figure 17 for Figure 16 A partial schematic diagram showing the valve core and plug rod in action; Figure 18 Schematic diagrams of different lengths of plug rods provided in embodiments of this application; Figure 19 for Figure 18 A partial schematic diagram showing the extended length of the plug rod engaging with the valve core; Figure 20 A schematic diagram of a fifth structure of the valve core provided in the embodiments of this application; Figure 21 A schematic diagram of a sixth structure of the valve core provided in the embodiments of this application; Figure 22 This is a schematic diagram of a second structure of the sealing arc sheet provided in the embodiments of this application; Figure 23 This is a schematic diagram of a third structure of the sealing arc sheet provided in the embodiments of this application; Figure 24 for Figure 23 A cross-sectional view of the sealing arc plate shown; Figure 25 This is a schematic diagram of the fourth structure of the sealing arc sheet provided in the embodiments of this application; Figure 26 A schematic diagram of the fifth structure of the sealing arc sheet provided in the embodiments of this application; Figure 27 A schematic diagram of a sixth structure of the sealing arc sheet provided in the embodiments of this application; Figure 28 for Figure 27 A cross-sectional view of the sealing arc plate shown; Figure 29 This is a schematic diagram of a structure of the second seal provided in an embodiment of this application; Figure 30 for Figure 29 Cross-sectional views of the second seal from different directions are shown; Figure 31 A seventh structural schematic diagram of the sealing arc sheet provided in the embodiments of this application; Figure 32 for Figure 31 The diagram shows one possible connection of the sealing arc plate; Figure 33 A schematic diagram of the eighth structure of the sealing arc sheet provided in the embodiments of this application; Figure 34 A ninth structural schematic diagram of the sealing arc sheet provided in the embodiments of this application; Figure 35 A schematic diagram of the tenth structure of the sealing arc sheet provided in the embodiments of this application; Figure 36 This is an eleventh structural schematic diagram of the sealing arc sheet provided in the embodiments of this application.

[0027] The reference numerals in the attached figures are as follows: 10. Plug valve; 100. Valve body; 110. Mounting cavity; 120. Fluid passage; 200. Valve core; 210. Second flow channel hole; 220. First protruding structure; 230. Bottom surface; 240. Top surface; 250. Second protruding structure; 260. Fourth protruding structure; 270. First end; 280. Second end; 300. Sealing arc; 310. First sealing surface; 320. Second sealing surface; 330. First flow channel hole; 340. Elastic buffer zone; 350. Chamfered structure or beveled structure; 360. End face; 370. Limiting cavity; 400. Gland; 410. Third protruding structure; 500. Plug rod; 510. First part; 520. Second part; 530. Third part; 540. Flat key; 550. Thrust Bearing; 610, First seal; 620, Second seal; 630, Sealing disc; 640, First sealing assembly; 650, Second sealing assembly; 700, Limiting element; 800, Plug cap; 910, Valve cover; 920, Gland seal; 930, Bolt; 940, Elastic gasket; 950, Pressure plate; 960, Wing nut; 970, Sector retaining ring; 980, Shaft elastic retaining ring; 990, Union seal ring; 241, Mounting hole; 311, Second sealing groove; 312, Receiving groove; 313, Second recess; 321, First recess; 322, First sealing groove; 323, First region; 324, Second region; 3241, First sub-region; 3242, Second sub-region; H1, First direction; H2, Second direction. Detailed Implementation

[0028] The following will refer to the appendices in this application. Figure 1 To be continued Figure 36 The technical solutions in this application are clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In recent years, with the increasing demand for oil and gas energy, the scale of oil and gas extraction operations has been expanding, leading to higher requirements for the service life and operational efficiency of oil and gas equipment. As a crucial component of oil and gas pipeline equipment, the stable operation of plug valves and the reduction of manual maintenance costs play a vital role in improving the efficiency of oil and gas extraction operations. However, plug valves using certain technologies require regular grease injection during use, and their opening and closing torque gradually increases, eventually becoming difficult to open and close. Furthermore, some fluid media are corrosive, causing corrosion of the sealing surface of the plug valve after a period of use, resulting in leaks. Moreover, fluid media often carry small solid impurities that can easily become trapped between the sealing surfaces, damaging the seal and causing leaks. Therefore, plug valves using certain technologies are prone to sealing failure and difficulty in opening and closing, severely impacting oil and gas extraction efficiency.

[0031] To address this, this application provides a plug valve 10 with good stability and low maintenance costs. Please refer to... Figures 1 to 3 , Figure 1 This is a schematic diagram of a plug valve 10 provided in an embodiment of this application. Figure 2 This is a partial schematic diagram of the plug valve 10 provided in an embodiment of this application. Figure 3 for Figure 2 A cross-sectional view of the plug valve 10 shown. Figure 2 , Figure 3 right Figure 1 The structure of the plug valve 10 has been simplified. The plug valve 10 includes a valve body 100, a valve core 200, and a sealing arc plate 300. The valve body 100 has a mounting cavity 110. The valve core 200 is disposed within the mounting cavity 110. The sealing arc plate 300 is disposed within the mounting cavity 110 and is located between the inner wall of the mounting cavity 110 and the valve core 200. The sealing arc plate 300 includes a first sealing surface 310 and a second sealing surface 320 disposed opposite to each other along a first direction H1. In the first direction H1, the inner wall of the mounting cavity 110, the first sealing surface 310, the second sealing surface 320, and the valve core 200 are arranged sequentially. The first diameter of the first sealing surface 310 is larger than the second diameter of the inner wall of the mounting cavity 110, and the third diameter of the second sealing surface 320 is larger than the fourth diameter of the outer wall of the valve core 200.

[0032] It is understood that the valve body 100 may, but is not limited to, be a cylindrical pipe structure. The valve body 100 has interfaces at its opposite ends along a first direction H1 for connecting to other pipes. This first direction H1 is the extending direction or axial direction of the valve body 100; it may also be the length direction of the plug valve 10. The valve body 100 also has a fluid channel 120 extending along the first direction H1, which is used to communicate with other pipes and to transport fluid media transmitted through those pipes. In this embodiment, the fluid medium is interpreted broadly, referring to either a pure liquid medium or a mixture of a liquid and a solid medium.

[0033] It is understood that the mounting cavity 110 is located on the extension path of the fluid channel 120, and the cavity wall of the mounting cavity 110 is provided with an inlet and an outlet communicating with the fluid channel 120. The mounting cavity 110 may extend along a second direction H2 perpendicular to the first direction H1, and the second direction H2 may be the height direction of the plug valve 10. The mounting cavity 110 is used to accommodate the valve core 200 and the sealing arc plate 300. In some examples, the mounting cavity 110 may be a cylindrical cavity structure.

[0034] It is understood that the valve core 200 is provided with a second flow channel hole 210 extending along the first direction H1. The valve core 200 can rotate about an axis extending along the second direction H2, so that the second flow channel hole 210 is connected to or offset from the inlet and outlet of the cavity wall of the mounting cavity 110, thereby the valve core 200 can control the opening and closing of the fluid medium and regulate the flow rate. In some examples, the valve core 200 may be a cylindrical structure.

[0035] It is understood that the sealing arc plate 300 is provided with a first flow channel hole 330 extending along the first direction H1. The first flow channel hole 330 penetrates the first sealing surface 310 and the second sealing surface 320. The first flow channel hole 330 can communicate with the inlet or outlet of the cavity wall of the mounting cavity 110 and with the second flow channel hole 210 of the valve core 200. When the fluid passage 120 of the valve body 100, the inlet of the mounting cavity 110, the first flow channel hole 330 of the sealing arc plate 300, the second flow channel hole 210 of the valve core 200, and the outlet of the mounting cavity 110 are in the same straight line and arranged along the first direction H1, the plug valve 10 is in the open state. When the valve core 200 is rotated by a certain angle (e.g., 90 degrees), the second flow channel hole 210 of the valve core 200 is misaligned with the fluid passage 120, and the outer wall of the valve core 200 forms a seal with the second sealing surface 320 of the sealing arc plate 300, which can cut off the fluid.

[0036] It is understood that the sealing arc plate 300 can be a metal tile structure, and the valve body 100 and valve core 200 can also be metal structures, thus forming a metal seal between the sealing arc plate 300 and the valve body 100 and valve core 200. Specifically, the first sealing surface 310 of the sealing arc plate 300 is located near the inner wall of the mounting cavity 110 of the valve body 100, and the second sealing surface 320 is located near the outer wall of the valve core 200. The first sealing surface 310 is the outer sealing surface of the sealing arc plate 300, and the second sealing surface 320 is the inner sealing surface. The shape of the first sealing surface 310 can be adapted to the shape of the inner wall of the mounting cavity 110, and the shape of the second sealing surface 320 can be adapted to the shape of the outer wall of the valve body 100. A portion of the first sealing surface 310 can fit against the inner wall of the mounting cavity 110 to form a seal, such as a metal seal, in the fitting area. A portion of the second sealing surface 320 can fit against the outer wall of the valve core 200 to form a seal, such as a metal seal, in the fitting area. Thus, the sealing arc 300 can fill the gap between the valve body 100 and the valve core 200, provide uniform sealing pressure, effectively prevent fluid leakage, and enhance the sealing performance of the plug valve 10.

[0037] It is understandable that when the first diameter of the first sealing surface 310 is larger than the second diameter of the inner wall of the mounting cavity 110, and the third diameter of the second sealing surface 320 is larger than the fourth diameter of the outer wall of the valve core 200, the first sealing surface 310 and the inner wall of the mounting cavity 110 are not completely fitted together, and the second sealing surface 320 and the outer wall of the valve core 200 are also not completely fitted together. An elastic buffer zone 340 can be formed between the sealing arc plate 300 and the inner wall of the mounting cavity 110. Because the valve core 200 moves with the pressure fluctuations in the fluid channel 120 when it is opened, a floating seal is formed between the valve core 200 and the sealing arc plate 300. The above-mentioned dimensional design of the sealing arc plate 300 makes the sealing arc plate 300 form a "spring" structure. The elastic buffer zone 340 can buffer the collision between the valve body 100, the valve core 200 and the sealing arc plate 300, reduce the collision wear of the surface coating of the valve core 200 and the sealing arc plate 300, and the coating used to enhance wear resistance, corrosion resistance and improve surface hardness is not easily damaged. The sealing arc plate 300 and the valve core 200 can maintain good sealing performance for a long time.

[0038] It is understandable that the first diameter dimension, the second diameter dimension, the third diameter dimension, and the fourth diameter dimension are dimensional data measured based on the same standard. For example, taking the axis extending along the second direction H2 of the valve core 200 as a reference, the first diameter dimension to the fourth diameter dimension are the maximum distances from the corresponding arc surface, inner wall, and outer wall to this axis.

[0039] Understandably, in some examples, the plug valve 10 includes two sealing arcs 300, one of which is disposed between the inlet of the mounting cavity 110 and the valve core 200, and the other of which is disposed between the valve core 200 and the outlet of the mounting cavity 110.

[0040] In this embodiment of the application, the sealing arc plate 300 and the valve core 200 of the plug valve 10 are both disposed in the mounting cavity 110 of the valve body 100. The sealing arc plate 300 is located between the inner wall of the mounting cavity 110 and the valve core 200, so that the inner wall of the mounting cavity 110, the first sealing surface 310, the second sealing surface 320 and the valve core 200 are arranged in sequence. When the diameter of the first sealing surface 310 is larger than the diameter of the inner wall of the mounting cavity 110, and the diameter of the second sealing surface 320 is larger than the diameter of the outer wall of the valve core 200, the first sealing surface 310 is not completely fitted with the inner wall of the mounting cavity 110, and the second sealing surface 320 is not completely fitted with the outer wall of the valve core 200. An elastic buffer zone 340 can be formed between the sealing arc plate 300 and the inner wall of the mounting cavity 110. The elastic buffer zone 340 can buffer the collision between the valve body 100, the valve core 200 and the sealing arc plate 300, reduce the collision wear of the surface coating of the valve core 200 and the sealing arc plate 300, and the sealing arc plate 300 and the valve core 200 can maintain good sealing performance for a long time. It is not necessary to frequently replace and repair the sealing arc plate 300 and the valve core 200, which greatly improves the performance stability and service life of the plug valve 10 and reduces the maintenance cost of the plug valve 10.

[0041] In some examples, such as Figure 2 and Figure 3 As shown, when the plug valve 10 is stationary, the two side edges of the first sealing surface 310 of the sealing arc plate 300 contact the inner wall of the mounting cavity 110 of the valve body 100, respectively. A gap is formed between the middle area of ​​the first sealing surface 310 and the inner wall of the mounting cavity 110, which can form an elastic buffer zone 340. The middle area of ​​the second sealing surface 320 is in contact with the outer wall of the valve core 200, and the two side edges of the second sealing surface 320 are spaced apart from the outer wall of the valve core 200 and do not contact it.

[0042] Understandably, the two side edges of the first sealing surface 310 contact the inner wall of the mounting cavity 110, and a sealing space can be formed between the first sealing surface 310 and the mounting cavity 110. The fluid medium entering from the inlet of the mounting cavity 110 or flowing out from the second flow channel hole 210 of the valve core 200 is restricted to flow within the sealing space by the two side edges of the first sealing surface 310 and is not easy to flow out from the two side edges of the first sealing surface 310. The middle region of the first sealing surface 310 can be the region around the first flow channel hole 330 of the first sealing surface 310. The middle region does not contact the inner wall of the mounting cavity 110, and the gap formed between the two can form an elastic buffer zone 340.

[0043] Understandably, the two side edges of the second sealing surface 320 can be raised relative to the outer wall of the valve core 200 without contacting it, and the central area around the first flow channel hole 330 of the second sealing surface 320 can fit against the outer wall. The second sealing surface 320 and the first sealing surface 310 can cooperate to form a "spring structure". When the fluid medium flows in from the inlet of the mounting cavity 110 and exerts an impact force on the valve core 200, the valve core 200 can fit tightly against the central area of ​​the second sealing surface 320.

[0044] In this embodiment, the first sealing surface 310 can form a sealing space with the mounting cavity 110, and the first sealing surface 310 and the second sealing surface 320 can cooperate to form a "spring structure". The sealing arc plate 300 can not only achieve better sealing, but also greatly reduce the collision force between the valve body 100, the valve core 200 and the sealing arc plate 300, and the performance of the sealing arc plate 300 is better.

[0045] In some examples, when the second diameter of the inner wall of the mounting cavity 110 is in the range of 0 to 100 mm, the difference between the first diameter of the first sealing surface 310 and the second diameter of the inner wall of the mounting cavity 110 does not exceed 0.25 mm. When the second diameter of the inner wall of the mounting cavity 110 is in the range of 100 to 200 mm, the difference between the first diameter of the first sealing surface 310 and the second diameter of the inner wall of the mounting cavity 110 does not exceed 0.5 mm.

[0046] For example, when the second diameter is 100mm, the difference between the first and second diameters is approximately 0.25mm; when the second diameter is 50mm, the difference is approximately 0.125mm; when the second diameter is 150mm, the difference is approximately 0.375mm; and when the second diameter is 200mm, the difference is approximately 0.5mm.

[0047] In some examples, when the fourth diameter of the outer wall of the valve core 200 is in the range of 0 to 100 mm, the difference between the third diameter of the second sealing surface 320 and the fourth diameter of the outer wall of the valve core 200 does not exceed 0.1 mm; when the fourth diameter of the outer wall of the valve core 200 is in the range of 100 to 200 mm, the difference between the third diameter of the second sealing surface 320 and the fourth diameter of the outer wall of the valve core 200 does not exceed 0.2 mm.

[0048] For example, when the fourth diameter is 100mm, the difference between the third and fourth diameters is approximately 0.1mm; when the fourth diameter is 50mm, the difference is approximately 0.05mm; when the fourth diameter is 150mm, the difference is approximately 0.15mm; and when the fourth diameter is 200mm, the difference is approximately 0.2mm.

[0049] Understandably, in some examples, considering that the central region of the second sealing surface 320 is in contact with the outer wall of the valve core 200, while the central region of the first sealing surface 310 forms a gap with the inner wall of the mounting cavity 110, the difference in diameter between the first sealing surface 310 and the inner wall of the mounting cavity 110 may be greater than the difference in diameter between the second sealing surface 320 and the outer wall of the valve body 100.

[0050] The diameter range of the first sealing surface 310 and the second sealing surface 320 in this embodiment can ensure the elasticity of the sealing arc plate 300, forming a "spring structure", and also improve the sealing performance of the sealing arc plate 300.

[0051] Please refer to the following: Figures 4 to 7 , Figure 4 This is a schematic diagram of a first structure of the valve core 200 provided in an embodiment of this application. Figure 5 for Figure 4 The diagram shown is a schematic representation of the valve core 200 in another direction. Figure 6 for Figure 4 The diagram shows a combination of valve core 200 and sealing arc plate 300. Figure 7 for Figure 4 This is a schematic diagram showing the valve core 200 cooperating with the sealing arc plate 300 from another direction. In some examples, the valve core 200 also includes a first protrusion structure 220, which is disposed on the outer wall of the valve core 200 and protrudes from the outer wall of the valve core 200 along a first direction H1. The first protrusion structure 220 is spaced apart from the second flow channel hole 210. For example... Figure 6 and Figure 7 As shown, when the second flow channel hole 210 and the first flow channel hole 330 are misaligned, the first protrusion structure 220 is used to contact the area surrounding the first flow channel hole 330 of the second sealing surface 320. The first protrusion structure 220 can contact the second sealing surface 320 of the sealing arc plate 300, and the two can form a line contact or a small area contact, for example... Figure 6 and Figure 7 Area A is shown in the diagram.

[0052] Understandably, in some examples, the first protrusion structure 220 is an arc-shaped protrusion structure that protrudes from the outer wall of the valve core 200. The height of the first protrusion structure 220 protruding from the outer wall of the valve core 200 gradually increases, so that the transition between the first protrusion structure 220 and the outer wall of the valve core 200 is more natural.

[0053] Understandably, in some examples, valve core 200 may include one or more (two or more) first protrusion structures 220.

[0054] In this embodiment, the outer wall of the valve core 200 is provided with a first protrusion structure 220. When the plug valve 10 is in the closed state, the first protrusion structure 220 and the first flow channel hole 330 of the sealing arc plate 300 cooperate with each other, so that the original surface contact between the second sealing surface 320 and the outer wall of the valve core 200 becomes the line contact or small area contact between the first protrusion structure 220 and the sealing arc plate 300. A high sealing specific pressure is formed between the first protrusion structure 220 and the sealing arc plate 300, which improves the sealing performance of the plug valve 10.

[0055] In some examples, please refer to Figure 8 , Figure 8 This is a schematic diagram of a first structure of the sealing arc plate 300 provided in an embodiment of this application. The edge of the first flow channel hole 330 of the sealing arc plate 300 near the second sealing surface 320 is connected to the valve core 200 through a chamfered structure or a beveled structure 350. In this case, the contact area between the first protrusion structure 220 and the sealing arc plate 300 is smaller, and a higher sealing specific pressure can be formed between the first protrusion structure 220 and the sealing arc plate 300, further improving the sealing performance.

[0056] In some examples, please combine Figure 1 Please refer to Figure 9 , Figure 9 This is a schematic diagram of a second structure of the valve core 200 provided in an embodiment of this application. The valve core 200 further includes a bottom surface 230 disposed at one end of the outer wall of the valve core 200, and a second protruding structure 250 disposed thereon and protruding from the bottom surface 230 along the second direction H2. The plug valve 10 also includes a pressure cap 400, which is disposed on one side of the bottom surface 230 along the second direction H2, and the pressure cap 400 is used to abut against the second protruding structure 250.

[0057] Understandably, the gland 400 is used to seal the mounting cavity 110 below it, and the projection of the gland 400 along the second direction H2 covers the mounting cavity 110. The gland 400, the second protruding structure 250, and the valve core 200 are arranged sequentially along the second direction H2. While sealing the mounting cavity 110, the gland 400 first contacts the second protruding structure 250, reducing the contact area between the gland 400 and the valve core 200. Simultaneously, the gland 400 and other areas of the bottom surface 230 of the valve core 200 form a storage space for storing foreign objects inside the valve. This storage space reduces the impact of foreign objects on the torque during the rotation of the valve core 200, improving the stability of the valve core 200's rotation.

[0058] It is understandable that, such as Figure 9 As shown, the second protruding structure 250 can protrude from the center of the bottom surface 230 of the valve core 200. In some examples, such as Figure 10 As shown, Figure 10 This is a schematic diagram of the third structure of the valve core 200 provided in the embodiments of this application. The second protrusion structure 250 can also be a protrusion along the edge of the bottom surface 230 of the valve core 200 and form one or more annular protrusions.

[0059] It is understood that, in some examples, one or more second protrusion structures 250 may be provided on the bottom surface 230 of the valve core 200. This application embodiment does not limit the number or location of the second protrusion structures 250.

[0060] In this embodiment, the contact area between the gland 400 and the second protrusion structure 250 on the bottom surface 230 of the valve core 200 is small. This can reduce the contact area between the gland 400 and the valve core 200, thereby increasing their sealing pressure ratio. It can also reduce the influence of foreign objects on the rotational torque of the valve core 200. As a result, the sealing performance and rotary switching performance of the plug valve 10 are both superior.

[0061] Please refer to the following: Figure 11 and Figure 12 , Figure 11 This is a schematic diagram of the first structure of the pressure cap 400 provided in an embodiment of this application. Figure 12 for Figure 11 The diagram shows a cross-sectional view of the gland 400. In some examples, the gland 400 is provided with a third protrusion 410 protruding from the gland 400 along a second direction H2, the third protrusion 410 being used to abut against the bottom surface 230 of the valve core 200.

[0062] It is understandable that the gland 400 is used to abut against the bottom of the valve core 200 and seal the bottom of the mounting cavity 110. For example, Figure 11 and Figure 12 As shown, the third protruding structure 410 can protrude along the center of the gland 400. Of course, in other instances, such as Figure 13 and Figure 14 As shown, Figure 13 This is a schematic diagram of a second structure of the pressure cap 400 provided in an embodiment of this application. Figure 14 for Figure 13 A cross-sectional view of the pressure cap 400 shown shows that the third protrusion structure 410 can also protrude along the edge of the pressure cap 400 and form one or more annular protrusions.

[0063] Understandably, in some examples, one or more third protrusion structures 410 may be provided on the cap 400.

[0064] It is understood that in some examples, the plug valve 10 may be provided with a second protrusion structure 250 or a third protrusion structure 410, or the plug valve 10 may be provided with both a second protrusion structure 250 and a third protrusion structure 410. This application does not limit this aspect.

[0065] In this embodiment, the third protrusion 410 of the gland 400 has a smaller contact area with the bottom surface 230 of the valve core 200, which reduces the contact area between the gland 400 and the valve core 200 and improves their sealing pressure ratio. Simultaneously, the bottom surface 230 of the valve core 200 and other areas of the gland 400 provide storage space for foreign objects inside the valve, reducing the impact of foreign objects on the torque during valve core 200 rotation and improving the stability of valve core 200 rotation. Therefore, the plug valve 10 of this application has superior sealing performance and rotary switching performance.

[0066] In some examples, please combine Figure 4 Please refer to Figure 15 , Figure 15 This is a schematic diagram of a plug rod 500 provided in an embodiment of this application. The plug valve 10 also includes a plug rod 500, which is connected to the valve core 200 and can drive the valve core 200 to rotate.

[0067] It is understood that the plug rod 500 includes a first part 510, a second part 520, and a third part 530 connected sequentially along the second direction H2. The first part 510 cooperates with the valve core 200 and drives the valve core 200 to rotate. The second part 520 is located outside the mounting hole 241 of the valve core 200 and has a larger diameter than the mounting hole 241. The second part 520 is used to cooperate with the valve body 100. The third part 530 can be connected to the plug cap 800 of the plug valve 10. The user rotates the plug cap 800 to drive the plug rod 500 to rotate, thereby driving the valve core 200 to move. In some examples, please refer again to... Figure 1 The stopcock cap 800 and the third part 530 of the stopcock rod 500 can be connected by a flat key 540, and a thrust bearing 550 is provided in the connection area between the second part 520 and the third part 530.

[0068] It is understood that the valve core 200 also includes a top surface 240 disposed at the other end of the outer wall of the valve core 200, which is disposed opposite to the bottom surface 230 at both ends of the outer wall of the valve core 200 along the second direction H2. Figure 4 As shown, the top surface 240 of the valve core 200 is also provided with a mounting hole 241 extending along the second direction H2, and the first part 510 of the plug rod 500 is inserted into the mounting hole 241 to achieve the connection between the two.

[0069] In some examples, please refer to Figure 16 and Figure 17 , Figure 16 This is a schematic diagram of the fourth structure of the valve core 200 provided in the embodiments of this application. Figure 17 for Figure 16 The diagram shows a partial view of the valve core 200 engaging with the stopcock 500. The valve core 200 also includes a fourth protrusion structure 260 disposed on the top surface 240 of the valve core 200. The fourth protrusion structure 260 protrudes from the top surface 240 of the valve core 200 along the second direction H2. The fourth protrusion structure 260 is configured to contact the stopcock 500 and to space the top surface 240 from the valve body 100.

[0070] It is understandable that when the valve core 200 is subjected to the force of the fluid medium, the valve core 200 can float up and down along the second direction H2. During the upward floating process, as... Figure 17 As shown in region B, the fourth protrusion 260 of the valve core 200 preferentially contacts the second part 520 of the plug rod 500, causing the plug rod 500 to transmit an upward force, such as... Figure 17 As shown in region C, the second portion 520 of the plug rod 500 can avoid contact with the valve body 100. Therefore, the fourth protrusion structure 260 of the valve core 200 in this embodiment can optimize the sliding friction between the valve core 200 and the valve body 100 into the rolling friction of the plug rod 500 pushing the thrust bearing 550, thereby reducing the rotational torque.

[0071] In some examples, the length of the stopcock 500 can be increased so that the stopcock 500 contacts the valve core 200 before the valve body 100. The length of at least one of the first portion 510 and the second portion 520 of the stopcock 500 is increased, such that the stopcock 500 is configured such that the first portion 510 contacts the top surface 240 and the second portion 520 is spaced apart from the valve body 100.

[0072] For example, such as Figure 18 and Figure 19 As shown, Figure 18 The diagram shows the structure of the stopcock rod 500 of different lengths provided in the embodiments of this application. Figure 19 for Figure 18The diagram shows a partial view of the extended plug rod 500 engaging with the valve core 200. Figure 18 The left-hand attached figure shows the stopcock rod 500 at its normal length, while the right-hand attached figure shows the stopcock rod 500 after its length has been increased. In this embodiment, the length of the second part 520 of the stopcock rod 500 can be increased, so that the stopcock rod 500 is configured such that the first part 510 contacts the top surface 240 and the second part 520 is spaced apart from the valve body 100.

[0073] It is understood that the length of the first part 510, the length of the second part 520, or both parts of the present application can be increased. When the lengths of the first part 510 and / or the second part 520 are increased, the second part 520 can avoid contact with the valve body 100 when the valve core 200 contacts the first part 510. This optimizes the sliding friction between the second part 520 and the valve body 100 into rolling friction that drives the thrust bearing 550, thereby reducing the rotational torque.

[0074] In this embodiment of the application, by providing a fourth protrusion structure 260 on the top surface 240 of the valve core 200, or by increasing the length of the first part 510 and / or the second part 520 of the plug rod 500, the sliding friction between the valve core 200 and the valve body 100 can be optimized into the rolling friction of the valve core 200 pushing the thrust bearing 550, thereby reducing the rotational torque of the plug valve 10, making the opening and closing of the plug valve 10 smoother, and the opening and closing performance of the plug valve 10 more stable.

[0075] Please refer to this again. Figure 3 Please refer to Figure 20 , Figure 20 This is a fifth structural schematic diagram of the valve core 200 provided in the embodiments of this application. In some examples, the valve core 200 further includes a first end 270 and a second end 280 that are disposed opposite to each other along the second direction H2 and are respectively connected to the outer wall of the valve core 200. The top surface 240 of the valve core 200 may be disposed at the first end 270, and the bottom surface 230 of the valve core 200 may be disposed at the second end 280.

[0076] Understandably, in some examples, the diameter of the first end 270 is smaller than the diameter of the outer wall of the valve core 200. Compared to solutions where the diameter of the first end 270 is equal to the diameter of the outer wall of the valve core 200, the solution of this application has a smaller contact area between the sealing arc 300 and the valve core 200 in the second direction H2, resulting in less friction and wear between the valve core 200 and the sealing arc 300 during rotation, a smaller rotational torque during valve core 200 rotation, a smaller rotational force required for valve core 200 rotation, less wear on the valve core 200, and superior rotational stability and service life performance of the valve core 200.

[0077] Understandably, in some examples, the diameter of the second end 280 is smaller than the diameter of the outer wall of the valve core 200. In this case, the contact area between the sealing arc 300 and the valve core 200 is also smaller, and the rotational torque when the valve core 200 rotates is also smaller. Of course, in some examples, the diameters of the first end 270 and the second end 280 can both be smaller than the diameter of the outer wall of the valve core 200.

[0078] Understandably, in some examples, such as Figure 20 As shown, at least one of the first end 270 and the second end 280 is connected to the outer wall of the valve core 200 through a chamfered structure. The diameter of the portion of the first end 270 and the second end 280 connected to the outer wall of the valve core 200 gradually decreases, while the diameter of the portion of the first end 270 and the second end 280 away from the outer wall of the valve core 200 is equal.

[0079] Understandably, in some examples, such as Figure 21 As shown, Figure 21 This is a sixth structural schematic diagram of the valve core 200 provided in the embodiments of this application. The diameter of at least one of the first end 270 and the second end 280 decreases the further away from the outer wall of the valve core 200. The first end 270 and the second end 280 are formed by increasing the chamfer, and their diameters gradually decrease.

[0080] It is understood that the first end 270 and the second end 280 can reduce the contact area with the valve core 200 in the same or different ways. For example, one end can be connected to the outer wall of the valve core 200 through a chamfered structure, while the diameter of the other end can gradually decrease. This application does not limit the specific structure of the first end 270 and the second end 280.

[0081] It is understood that the first end 270 and the second end 280 can be formed by material removal processes or by integral molding using a mold. The embodiments of this application do not limit the form or manner of the first end 270 and the second end 280.

[0082] In this embodiment, at least one of the first end 270 and the second end 280 of the valve core 200 has a diameter smaller than the diameter of the outer wall of the valve core 200. The contact area between the sealing arc plate 300 and the valve core 200 is smaller, the rotational torque of the valve core 200 is smaller, and the rotational stability and service life of the valve core 200 are both superior.

[0083] In some examples, please refer to Figure 22 , Figure 22This is a schematic diagram of a second structure of the sealing arc plate 300 provided in an embodiment of this application. The second sealing surface 320 of the sealing arc plate 300 in this embodiment is provided with at least one first groove 321 recessed towards the first sealing surface 310. This first groove 321 does not penetrate the sealing arc plate 300 along its thickness direction.

[0084] It is understood that the first groove 321 can be an annular groove surrounding the first flow channel hole 330 of the sealing arc plate 300, and one or more first grooves 321 can be provided on the second sealing surface 320, forming a "labyrinth seal". Each first groove 321 can divide the second sealing surface 320 into an inner ring and an outer ring, thereby generating multiple annular contact surfaces for the sealing arc plate 300. When the second sealing surface 320 abuts against the valve core 200, multiple sealing surfaces can be generated, gradually sealing the contact stress between the sealing arc plate 300 and the valve core 200, greatly improving the sealing performance between the sealing arc plate 300 and the valve core 200.

[0085] This application embodiment provides a "labyrinth seal" structure on the second sealing surface 320 of the sealing arc plate 300, which enables the second arc plate and valve core 200 to generate multi-stage seals, greatly enhancing the sealing performance of the second sealing surface 320 of the sealing arc plate 300.

[0086] In some examples, please refer to Figure 23 and Figure 24 , Figure 23 This is a schematic diagram of a third structure of the sealing arc plate 300 provided in an embodiment of this application. Figure 24 for Figure 23 The diagram shows a cross-sectional view of the sealing arc plate 300. The second sealing surface 320 of the sealing arc plate 300 may also be provided with a first sealing groove 322, which is recessed toward the first sealing surface 310 and does not penetrate the sealing arc plate 300 along its thickness direction. The plug valve 10 also includes a first sealing element 610, which is disposed within the first sealing groove 322 and is capable of sealing the gap between the second arc plate and the valve core 200.

[0087] It is understood that the first sealing groove 322 may be, but is not limited to, an annular groove structure surrounding the first flow channel hole 330. During the manufacturing process, the first sealing groove 322 and the first groove 321 can be formed on the second sealing surface 320 using the same process. Of course, the first sealing groove 322 may also be a conventional rectangular groove, dovetail groove, etc. The shape of the first sealing groove 322 is not limited in the embodiments of this application.

[0088] Understandably, in some examples, the first seal 610 may not be disposed within the first sealing groove 322 but directly within the first recess 321. In this case, the second sealing surface 320 may not have the first sealing groove 322, but instead use the first recess 321 as the sealing groove. Furthermore, when the second arc plate has multiple first recesses 321, one of the first recesses 321 can serve as a sealing groove to accommodate the first seal 610, while the other first recesses 321 continue to serve as sealing grooves to generate multiple sealing surfaces.

[0089] It is understood that embodiments of this application may provide a separate first groove 321 or a separate first sealing groove 322, or both a first groove 321 and a first sealing groove 322 may be provided simultaneously. Embodiments of this application may include one or more first sealing elements 610. All of the one or more first sealing elements 610 may be provided in the first sealing groove 322 or the first groove 321, or partially in the first sealing groove 322 and partially in the first groove 321. Embodiments of this application do not limit the number of first sealing elements 610, first sealing grooves 322, and first grooves 321.

[0090] It is understood that the first seal 610 can be, but is not limited to, an O-ring, a D-seal, or other rubber, plastic, or soft metal seal that mates with the sealing groove. In some examples, the first seal 610 can be vulcanized within the first sealing groove 322 or the first recess 321. After installation in the first sealing groove 322 or the first recess 321, the first seal 610 can slightly protrude from the second sealing surface 320 of the sealing arc plate 300 and has a certain degree of elasticity.

[0091] In this embodiment, a first sealing groove 322 is provided on the second sealing surface 320 of the sealing arc plate 300 to accommodate the first sealing member 610. When the valve core 200 is pressed against the second sealing surface 320, the first sealing member 610 is squeezed, which can form a stable seal and further improve the sealing performance of the plug valve 10.

[0092] In some examples, please refer to Figure 25 , Figure 25 This is a schematic diagram of a fourth structure of the sealing arc plate 300 provided in the embodiments of this application. The second sealing surface 320 of the sealing arc plate 300 includes a first region 323 and a second region 324. The first region 323 is disposed along the periphery of the first flow channel hole 330 and protrudes from the second region 324 in the direction toward the valve core 200. The second region 324 is connected to the first region 323.

[0093] Understandably, the first region 323 is an annular protrusion surrounding the first flow channel hole 330. When the valve core 200 is in the open state, aligning the two flow channel holes, the first region 323 is in close contact with the region near the second flow channel hole 210 of the valve core 200. When the valve core 200 is in the closed state, misaligning the two flow channel holes, the first region 323 is in close contact with the region of the valve core 200 away from the second flow channel hole 210 (for example, but not limited to, the first region 323 being in close contact with the first protrusion structure 220 of the valve core 200).

[0094] Understandably, in some examples, the height of the first region 323 protruding from the second region 324 gradually increases, thus making the transition between the first region 323 and the second region 324 more natural.

[0095] In the embodiment of this application, when the second sealing surface 320 of the sealing arc plate 300 is tightly fitted with the valve core 200, the protruding first region 323 is in close contact with the valve core 200. Compared with the solution where the entire second sealing surface 320 is fitted with the valve core 200, the contact area between the first region 323 and the sealing arc plate 300 is smaller, and the sealing pressure between the two is lower. At the same time, a storage space for storing foreign objects can be formed between the second region 324 and the valve core 200. Thus, the solution of this application embodiment can reduce the rotational torque of the valve core 200.

[0096] In some examples, such as Figure 25 and Figure 26 As shown, Figure 26 This is a fifth structural schematic diagram of the sealing arc sheet 300 provided in the embodiments of this application. The second region 324 of the second sealing surface 320 includes two first sub-regions 3241, or two second sub-regions 3242, or both first sub-regions 3241 and two second sub-regions 3242.

[0097] Understandably, in some examples, two first sub-regions 3241 can be disposed on opposite sides of the first region 323 along the height direction of the sealing arc 300. In the height direction of the sealing arc 300, the thickness of the first sub-region 3241 is smaller the further away from the first region 323. Thus, the thickness of the first sub-region 3241 can gradually decrease, the first sub-region 3241 can form a large chamfer structure, and the first sub-region 3241 can form a guide structure, which can provide guidance for the valve core 200 when it is installed into the mounting cavity 110. The guide structure can ensure that the valve core 200 is not easily skewed when it is rotated in.

[0098] Understandably, in some examples, two second sub-regions 3242 are disposed on opposite sides of the first region 323 along the width direction of the sealing arc 300. The thickness of the second sub-region 3242 decreases the further away from the first region 323 along the width direction of the sealing arc 300. This allows the second sub-region 3242 to form a large chamfered structure, making it easier for the first region 323 to contact the valve core 200, and creating a space for storing foreign objects between the second sub-region 3242 and the valve core 200.

[0099] Understandably, in some examples, the connection areas of each first sub-region 3241 and the first region 323 are connected by rounded corners; or, the connection areas of each second sub-region 3242 and the first region 323 are also connected by rounded corners; or, the connection areas of each first sub-region 3241 and the first region 323, and the connection areas of each second sub-region 3242 and the first region 323, are all connected by rounded corners. In this case, the connection points of the first sub-region 3241, the second sub-region 3242, and the first region 323 can form an inlet angle, which makes it easier for the valve core 200 to be installed into the mounting cavity 110.

[0100] In some examples, such as Figure 27 and Figure 28 As shown, Figure 27 This is a schematic diagram of the sixth structure of the sealing arc sheet 300 provided in the embodiments of this application. Figure 28 for Figure 27 The diagram shows a cross-sectional view of the sealing arc plate 300. The first sealing surface 310 of the sealing arc plate 300 is further provided with a second sealing groove 311 recessed toward the second sealing surface 320. The plug valve 10 also includes a second sealing element 620, which is disposed in the second sealing groove 311 and abuts against the inner wall of the mounting cavity 110.

[0101] It is understood that the second sealing groove 311 can be, but is not limited to, an annular sealing groove surrounding the first flow channel hole 330, as well as conventional rectangular grooves, dovetail grooves, etc. The second sealing groove 311 can be located close to the first flow channel hole 330 or away from the first flow channel hole 330. The sealing arc plate 300 can be provided with one or more second sealing grooves 311.

[0102] It is understood that the second seal 620 can be, but is not limited to, rubber seals such as O-rings, D-rings, and beaded rings, as well as plastic or soft metal seals. For example, Figure 29 and Figure 30 As shown, Figure 29 This is a schematic diagram of a structure of the second seal 620 provided in an embodiment of this application. Figure 30for Figure 29 The diagram shows cross-sectional views of the second seal 620 from different directions. When the second seal 620 is a lace ring, the circular support structure 621 within the lace ring is positioned at the sealing gap between the sealing arc plate 300 and the inner wall of the mounting cavity 110 of the valve body 100. The strength of this circular support structure 621 is greater than the strength of the metal and non-metal structures of the base materials such as the valve body 100 and the sealing arc plate 300. The second seal 620 provides better sealing between the sealing arc plate 300 and the inner wall of the mounting cavity 110 of the valve body 100.

[0103] In this embodiment, a second sealing groove 311 is provided on the first sealing surface 310 of the sealing arc plate 300, and a second sealing member 620 is disposed in the second sealing groove 311 and can seal the gap between the first arc plate and the inner wall of the mounting cavity 110 of the valve body 100, which greatly improves the sealing performance between the sealing arc plate 300 and the valve body 100.

[0104] In some examples, such as Figure 27 As shown, the first sealing surface 310 is also provided with a receiving groove 312 communicating with the second sealing groove 311. In the width direction of the sealing arc plate 300, the receiving groove 312 is disposed between the edge of the second sealing groove 311 and the edge of the sealing arc plate 300. The bottom of the receiving groove 312 is also provided with a second groove 313 recessed towards the second sealing surface 320. A part of the second sealing member 620 is disposed in the second sealing groove 311, and another part of the second sealing member 620 is disposed in the receiving groove 312 and covers part of the second groove 313.

[0105] It is understandable that when the second sealing groove 311 is an annular groove, the receiving groove 312 is disposed on the annular path of the annular groove and protrudes from the annular groove in a direction away from the first flow channel hole 330. The receiving groove 312 can be an arc-shaped groove protruding from the second sealing groove 311. When the second sealing groove 311 has other groove structures, the receiving groove 312 is connected to a section of the second sealing groove 311 and protrudes in a direction away from the first flow channel hole 330.

[0106] It is understandable that when the sealing arc plate 300 includes multiple second sealing grooves 311, the receiving groove 312 can be set in one of the second sealing grooves 311 closest to the first flow channel hole 330 of the sealing arc plate 300, or in one of the second sealing grooves 311 on the outermost ring.

[0107] It is understood that the projected area of ​​the receiving groove 312 on the first sealing surface 310 is smaller than the projected area of ​​the second sealing groove 311 on the first sealing surface 310. The receiving groove 312 forms an extension area of ​​the second sealing groove 311, and can accommodate a portion of the second seal 620. Generally, in related technologies, the shape of the second sealing groove 311 is adapted to the shape of the second seal 620, and the volume of the second sealing groove 311 is slightly smaller than the volume of the second seal 620, so that the second seal 620 can undergo a certain compression deformation and be accommodated in the second sealing groove 311. However, in this solution, the second seal 620 is not easily installed into the second sealing groove 311. In contrast, the embodiment of this application provides a receiving groove 312 connected to the second sealing groove 311. This receiving groove 312 can provide a deformation area for the second seal 620 during installation, which is more conducive to the installation of the second seal 620.

[0108] It is understood that the second groove 313 is disposed within the receiving groove 312 and is recessed relative to the receiving groove 312, and the depth of the second groove 313 is greater than the depth of the receiving groove 312. For example, the second groove 313 is a circular groove structure disposed within the receiving groove 312. The radial dimension of the second sealing member 620 is smaller than the radial diameter of the second groove 313.

[0109] Understandably, when the second seal 620 is installed in the second sealing groove 311, a portion of the second seal 620 can be disposed within the receiving groove 312, and the second seal 620 can cover a portion of the second recess 313. When it is necessary to remove and replace the second seal 620, the second seal 620 corresponding to the second recess 313 can be pressed downwards, causing the other areas of the second seal 620 to lift up and detach from the second sealing groove 311 or the receiving groove 312. The second recess 313 can then act as a pressure relief mechanism, allowing for quick removal of the second seal 620.

[0110] In this embodiment, a receiving groove 312 is provided that communicates with the second sealing groove 311, and a sunken second groove 313 is provided in the receiving groove 312, which enables the rapid removal of the second sealing member 620.

[0111] Please refer to the following: Figure 31 and Figure 32 , Figure 31 This is a schematic diagram of the seventh structure of the sealing arc plate 300 provided in the embodiments of this application. Figure 32 for Figure 31The diagram shows a connection schematic of the sealing arc plate 300. The sealing arc plate 300 also includes an end face 360 ​​that is connected to the first sealing surface 310 and the second sealing surface 320 respectively. The sealing arc plate 300 also includes a limiting cavity 370, which extends from the end face 360 ​​along the second direction H2. The limiting cavity 370 is used to accommodate a part of the limiting member 700 for connection with the valve body 100 through the limiting member 700.

[0112] It is understood that the end face 360 ​​of the sealing arc plate 300 is either its top surface near the stopcock cap 800 or its bottom surface near the gland 400. The limiting cavity 370 is formed on the top surface of the sealing arc plate 300 and extends downwards to form a cavity structure capable of accommodating the limiting member 700; alternatively, the limiting cavity 370 is formed on the bottom surface of the sealing arc plate 300 and extends upwards to form a cavity structure accommodating the limiting member 700. The limiting member 700 may be, but is not limited to, a screw, threaded rod, pin, or similar structure.

[0113] Understandably, in some examples, such as Figure 31 As shown, the limiting cavity 370 includes a groove structure spaced apart from the edge of the end face 360. For example, the limiting cavity 370 can be a circular groove structure provided on the end face 360 ​​of the sealing arc plate 300, or it can be a pin hole structure. Of course, the limiting cavity 370 can also be a square groove, a polygonal groove, or other structures.

[0114] Understandably, in some examples, such as Figure 33 and Figure 34 As shown, Figure 33 This is a schematic diagram of the eighth structure of the sealing arc sheet 300 provided in the embodiments of this application. Figure 34 This is a ninth structural schematic diagram of the sealing arc plate 300 provided in the embodiments of this application. The limiting cavity 370 includes a groove structure communicating with one edge of the end face 360. The limiting cavity 370 extends downward from the end face 360 ​​of the sealing arc plate 300, and also extends from one edge of the end face 360 ​​towards the other edge, so that the limiting cavity 370 communicates with one edge of the sealing arc plate 300. The limiting cavity 370 is an arc-shaped groove structure with an opening. Wherein, as... Figure 33 As shown, the limiting cavity 370 can communicate with the edge near the first sealing surface 310, such as... Figure 34 As shown, the limiting cavity 370 can communicate with the edge near the second sealing surface 320.

[0115] Understandably, in some examples, such as Figure 35 and Figure 36 As shown, Figure 36 This is a schematic diagram of the tenth structure of the sealing arc plate 300 provided in the embodiments of this application. Figure 36This is an eleventh structural schematic diagram of the sealing arc plate 300 provided in this application embodiment. The limiting cavity 370 includes a groove structure communicating with the two side edges of the end face 360. The two side edges are respectively connected to the first sealing surface 310 and the second sealing surface 320, so that the limiting cavity 370 can connect with the first sealing surface 310 and the second sealing surface 320. The limiting cavity 370 is a strip-shaped groove penetrating the end face 360. The extension direction of the strip-shaped groove can either point to the center of the first sealing surface 310 and the second sealing surface 320 of the sealing arc plate 300, or extend along the first direction H1. This application embodiment does not limit the specific structure and shape of the limiting cavity 370.

[0116] Understandably, in some examples, the sealing arc plate 300 may be provided with one or more limiting cavities 370. For example, two limiting cavities 370 spaced apart may be provided on the top surface of the sealing arc plate 300. Another example is that two limiting cavities 370 spaced apart may be provided on the bottom surface of the sealing arc plate 300. Yet another example is that one limiting cavity 370 may be provided at each of the four corners of the top and bottom surfaces of the sealing arc plate 300. The number of limiting members 700 is equal to the number of limiting cavities 370, ensuring a one-to-one correspondence between the multiple limiting members 700 and the multiple limiting cavities 370.

[0117] One end of the limiting member 700 in this embodiment is connected to the valve body 100, and the other end of the limiting member 700 is inserted into the limiting cavity 370. The limiting member 700 can keep the sealing arc plate 300 relatively stationary during the rotation of the valve core 200, and prevent the sealing arc plate 300 from rotating with the valve core 200.

[0118] Based on the above structure, please refer again. Figure 1 In some examples, the stopcock valve 10 of this application embodiment also includes a bottom valve cover 910, which is disposed on the side of the gland 400 opposite to the stopcock. A gland seal 920 is provided between the gland 400 and the valve body 100 for sealing the fluid, a first sealing assembly 640 is provided between the upper sealing disc 630 and the valve body 100 for sealing the fluid, and a second sealing assembly 650 is provided between the stopcock rod 500 and the sealing disc 630 for sealing the fluid, thereby ensuring that the fluid is sealed within the inner cavity of the valve body 100, and the valve cover 910 fixes the gland 400 to the valve body 100.

[0119] In some examples, the upper end of the stopcock cap 800 is fixed to the valve body 100 by bolts 930, elastic washers 940, and pressure plates 950. The valve body 100, the wing nut 960 located at the end of the valve body 100 in the first direction H1, the sector retaining ring 970, and the shaft elastic retaining ring 980 form a male union connection end, and the valve body 100 and the union sealing ring 990 form a female union connection, so that both ends of the valve body 100 can be connected to other pipe fittings.

[0120] It should be noted that the above is only an exemplary description of the plug valve 10. The plug valve 10 may also include other structures. The embodiments of this application do not limit the structure of the plug valve 10.

[0121] Based on the above structure, the plug valve 10 of this application embodiment has the following design features: First, in order to reduce the internal vibration of the plug valve 10, the first sealing surface 310 of the sealing arc plate 300 is designed to have a diameter larger than the inner wall diameter of the mounting cavity 110, and the second sealing surface 320 has a diameter larger than the outer wall diameter of the valve core 200. The internal vibration of the valve is reduced by matching the sizes.

[0122] Secondly, in order to reduce the rotational torque of the plug valve 10 and ensure the rotational stability and service life of the plug valve 10, this application embodiment reduces the contact area between the valve core 200 and its structure such as the sealing arc plate 300, the gland 400, etc., thereby reducing the frictional torque of the valve core 200 during rotation and thus reducing the rotational torque.

[0123] For example, the outer wall of the valve core 200 is provided with a first protrusion structure 220. The first protrusion structure 220 reduces the contact area between the outer wall of the valve core 200 and the second sealing surface 320, so that the contact surface between the valve core 200 and the sealing arc plate 300 is concentrated around the second flow channel hole 210, increasing the contact stress with the second sealing surface 320 of the sealing arc plate 300 and improving the metal sealing performance; at the same time, reducing the contact area between the two reduces the rotational torque of the valve core 200.

[0124] For example, a second protrusion structure 250 with a central or annular protrusion can be provided on the bottom surface 230 of the valve core 200. This reduces the contact area between the valve core 200 and the gland 400, thereby reducing friction between them. It also increases the space for storing foreign objects, reducing the impact of foreign objects on the friction surface, and thus lowering the rotational torque of the valve core 200. Alternatively, the gland 400 can also be provided with a third protrusion structure 410 with a central or annular protrusion to further reduce the contact area between the gland 400 and the valve core 200, thereby reducing the rotational torque of the valve core 200.

[0125] For example, a fourth protrusion 260 is provided at the upper end of the valve core 200, so that when the valve core 200 floats up, it preferentially connects with the plug rod 500. The plug rod 500 transmits the force to the thrust bearing 550, changing the sliding friction to rolling friction, reducing the frictional force, and thus reducing the torque. Of course, this application can also lengthen the plug rod 500 so that when the plug floats up, it preferentially contacts the plug rod 500 and does not contact the valve body 100, which can also reduce the rotational torque.

[0126] Third, this application also provides a sealing arc plate 300 with high sealing performance across the entire pressure range. By providing multiple first sealing grooves 322 on the second sealing surface 320 of the sealing arc plate 300, a metal-non-metal combined seal is achieved, enhancing the sealing performance and corrosion resistance of the sealing arc plate 300. The second sealing surface 320 of the sealing arc plate 300, through the design of single or multiple non-metallic seals, can achieve stable sealing across the entire pressure range.

[0127] For example, in this embodiment of the application, the structure of the sealing arc plate 300 is modified, and only the core sealing area near the first flow channel hole 330 of the sealing arc plate 300 is retained. Other interfering areas of the second sealing surface 320 of the sealing arc plate 300 are removed. Material is removed by means of chamfering or material removal to form a protruding first area 323 on the second sealing surface 320, thereby reducing the impact of the shape change of the second sealing surface 320 during the processing and improving the sealing stability of the sealing arc plate 300.

[0128] For example, in the embodiments of this application, a second sealing groove 311 with a single or multiple non-metallic seals is provided on the first sealing surface 310 of the sealing arc plate 300, which can be used with non-metallic seals to achieve stable sealing of the first sealing surface 310 and the inner cavity of the valve body 100 throughout the entire pressure range.

[0129] For example, a second sealing groove 311 is provided on the first sealing surface 310 of the sealing arc plate 300, and an expansion area is provided on the innermost or outermost sealing groove, and the bottom of the expansion area is provided with a groove structure; the expansion area can accommodate the deformation of the sealing element, reduce the installation resistance, and facilitate disassembly.

[0130] For example, the sealing arc plate 300 is provided with sealing arc plate 300 limiting cavities 370 at the four corners. The limiting member 700, for example, a cylindrical pin, is installed in the pin hole of the valve body 100, and the protruding part cooperates with the limiting cavity 370 of the sealing arc plate 300 to prevent the sealing arc plate 300 from rotating in the circumferential direction. The limiting cavity 370 can be, but is not limited to, a complete circle, an arc shape with an opening, or a through strip groove, etc.

[0131] For example, the sealing element of the lace ring is fitted in the second sealing groove 311 of the first sealing surface 310 of the sealing arc plate 300. The supporting structure inside the lace ring has a greater supporting strength than the metal or non-metal of the substrate, and the sealing effect of the lace ring is better.

[0132] For example, the second sealing surface 320 of the sealing arc plate 300 is provided with a first groove 321 with multiple annular sealing structures. The multiple seals can independently complete the sealing. If one seal leaks due to corrosion, wear or other reasons, the other sealing rings can still provide a stable seal.

[0133] For example, the second sealing surface 320 of the sealing arc plate 300 is provided with a sealing groove, and a non-metallic seal is installed inside. The installed non-metallic seal is slightly higher than the inner sealing surface before compression. On the basis of the original metal seal, one or more sealing designs are added to make the seal more reliable. Moreover, the higher part will form an initial seal with the plug after installation, reducing the entry of impurities in the flow channel into the valve body 100.

[0134] It should be noted that the term "multiple" in this application generally refers to two or more. Furthermore, the directional terms used in the embodiments of this application, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrating and understanding the embodiments of this application, and not for limiting the embodiments of this application. In the various drawings, structurally similar units are represented by the same reference numerals. For clarity, the various parts in the drawings are not drawn to scale. Additionally, some related parts may not be shown in the drawings.

[0135] It should be understood that in the description of this application, terms such as "first" and "second" are used only to distinguish similar objects and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0136] It is understood that those skilled in the art can combine various implementation methods in the above embodiments under the guidance of the above examples to obtain technical solutions with multiple implementation methods. The above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

[0137] The plug valve provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A plug valve, characterized in that, include: The valve body has a mounting cavity; The valve core is disposed within the mounting cavity; and A sealing arc plate is disposed within the mounting cavity and located between the inner wall of the mounting cavity and the valve core. The sealing arc plate includes a first sealing surface and a second sealing surface disposed opposite to each other along a first direction. The inner wall of the mounting cavity, the first sealing surface, the second sealing surface, and the valve core are arranged sequentially. The diameter of the first sealing surface is larger than the diameter of the inner wall of the mounting cavity, and the diameter of the second sealing surface is larger than the diameter of the outer wall of the valve core.

2. The plug valve according to claim 1, characterized in that, The two side edges of the first sealing surface contact the inner wall of the mounting cavity, and a gap is formed between the middle area of ​​the first sealing surface and the inner wall of the mounting cavity. The two side edges of the second sealing surface are spaced apart from the outer wall of the valve core, and the middle area of ​​the second sealing surface is in contact with the outer wall of the valve core.

3. The plug valve according to claim 1, characterized in that, When the diameter of the inner wall of the mounting cavity is in the range of 0 to 100 mm, the difference between the diameter of the first sealing surface and the diameter of the inner wall of the mounting cavity does not exceed 0.25 mm; when the diameter of the inner wall of the mounting cavity is in the range of 100 to 200 mm, the difference between the diameter of the first sealing surface and the diameter of the inner wall of the mounting cavity does not exceed 0.5 mm; or, When the diameter of the outer wall of the valve core is in the range of 0 to 100 mm, the difference between the diameter of the second sealing surface and the diameter of the outer wall of the valve core shall not exceed 0.1 mm; when the diameter of the outer wall of the valve core is in the range of 100 to 200 mm, the difference between the diameter of the second sealing surface and the diameter of the outer wall of the valve core shall not exceed 0.2 mm.

4. The plug valve according to claim 1, characterized in that, The sealing arc sheet further includes a first flow channel hole penetrating the first sealing surface and the second sealing surface; The valve core includes a second flow channel hole and a first protrusion structure arranged at intervals. The second flow channel hole is used to communicate with or be offset from the first flow channel hole, and the first protrusion structure is provided and protrudes from the outer wall of the valve core. When the second flow channel hole and the first flow channel hole are misaligned, the first protrusion structure abuts against the area surrounding the first flow channel hole on the second sealing surface.

5. The plug valve according to claim 4, characterized in that, The edge of the first flow channel hole near the second sealing surface is connected to the second sealing surface through a chamfered structure or a beveled structure.

6. The plug valve according to claim 1, characterized in that, The valve core further includes a bottom surface disposed at one end of the outer wall of the valve core, and a second protrusion structure disposed thereon and protruding from the bottom surface in a second direction, the second direction being perpendicular to the first direction; The plug valve further includes a gland, which is disposed on one side of the bottom surface along the second direction, and the gland is used to abut against the second protruding structure.

7. The plug valve according to claim 1, characterized in that, The valve core also includes a bottom surface disposed at the end of the outer wall of the valve core; The plug valve further includes a gland, which has a third protrusion structure protruding from the gland along a second direction. The third protrusion structure is used to abut against the bottom surface of the valve core, and the second direction is perpendicular to the first direction.

8. The plug valve according to claim 1, characterized in that, The plug valve also includes a plug rod connected to the valve core and capable of driving the valve core to rotate; The valve core further includes a top surface disposed at the other end of the outer wall of the valve core, and a fourth protrusion structure disposed thereon and protruding from the top surface in a second direction, the second direction being perpendicular to the first direction; The fourth protrusion is configured to contact the stopcock and to space the top surface from the valve body.

9. The plug valve according to claim 1, characterized in that, The valve core also includes a top surface disposed at the other end of the outer wall of the valve core; The plug valve further includes a plug rod connected to the valve core and capable of driving the valve core to rotate. The plug rod includes a first part and a second part connected sequentially along a second direction. The second part is located on the side of the first part away from the valve core, and the second direction is perpendicular to the first direction. The stopcock is configured such that the first portion contacts the top surface and the second portion is spaced apart from the valve body.

10. The plug valve according to claim 1, characterized in that, The valve core further includes a first end and a second end, which are disposed opposite to each other along a second direction and respectively connected to the outer wall of the valve core, wherein the second direction is perpendicular to the first direction; wherein... The diameter of the first end is smaller than the diameter of the outer wall of the valve core; and / or, the diameter of the second end is smaller than the diameter of the outer wall of the valve core.

11. The plug valve according to claim 10, characterized in that, At least one of the first end and the second end is connected to the outer wall of the valve core via a chamfered structure; or, The diameter of at least one of the first end and the second end is smaller the further away from the outer wall of the valve core.

12. The plug valve according to claim 1, characterized in that, The second sealing surface is provided with a first groove recessed toward the first sealing surface; and / or, The second sealing surface is further provided with a first sealing groove recessed in the direction of the first sealing surface. The plug valve also includes a first sealing element, which is disposed in the first sealing groove and is used to abut against the second sealing surface and the outer wall of the valve core.

13. The plug valve according to claim 1, characterized in that, The sealing arc plate further includes a first flow channel hole; the second sealing surface includes a first region and a second region, the first region being disposed along the periphery of the first flow channel hole and protruding out of the second region in the direction toward the valve core.

14. The plug valve according to claim 13, characterized in that, The second region includes two first sub-regions and / or two second sub-regions; The two first sub-regions are located on opposite sides of the first region, and the thickness of the first sub-regions is smaller the further away from the first region. The two second sub-regions are located on opposite sides of the first region, and the thickness of the second sub-regions is smaller the further away from the first region.

15. The plug valve according to claim 13, characterized in that, The second region includes two first sub-regions and / or two second sub-regions; The two first sub-regions are located on opposite sides of the first region, and the two second sub-regions are located on the other opposite sides of the first region; Each of the first sub-regions is connected to the first region via a rounded corner transition; Each of the second sub-regions is connected to the first region with a rounded corner transition.

16. The plug valve according to claim 1, characterized in that, The first sealing surface is further provided with a second sealing groove recessed toward the second sealing surface. The plug valve also includes a second sealing element, which is disposed in the second sealing groove and abuts against the inner wall of the mounting cavity.

17. The plug valve according to claim 16, characterized in that, The first sealing surface is further provided with a receiving groove communicating with the second sealing groove. In the first direction, the receiving groove is disposed between the edge of the second sealing groove and the sealing arc plate. The bottom of the receiving groove is further provided with a second recessed groove facing the second sealing surface. A portion of the second seal is disposed within the second sealing groove, and another portion of the second seal is disposed within the receiving groove and covers a portion of the second groove.

18. The plug valve according to claim 16, characterized in that, The second seal includes a ring seal structure.

19. The plug valve according to any one of claims 1 to 18, characterized in that, The sealing arc sheet also includes an end face that is connected to the first sealing surface and the second sealing surface respectively. The sealing arc sheet also includes a limiting cavity, which is formed by the end face extending along a second direction perpendicular to the first direction. The limiting cavity is used to accommodate a part of the limiting member so as to be connected to the valve body through the limiting member. The limiting cavity includes: a groove structure spaced apart from the edge of the end face, or a groove structure connected to the edge of the end face near the first sealing surface or the second sealing surface, or a groove structure connected to the edge of the end face near the first sealing surface and the second sealing surface.

Images