Stop valve

Abstract

The utility model relates to the technical field of valves, in particular to a stop valve. The utility model provides a stop valve which comprises a valve pipe, a valve rod, a movable valve element and a static valve element, and one end of the valve rod is connected to the movable valve element and can drive the movable valve element to rotate so as to open or plug a communicating hole; the stop valve further comprises a limiting piece and a compensation structure, the limiting piece is fixedly connected with the inner wall of the valve pipe, the limiting piece abuts against the side, away from the static valve element, of the compensation structure in the axial direction of the valve pipe, and the other side of the compensation structure abuts against the valve rod. The compensation structure comprises an elastic piece, one end of the elastic piece directly or indirectly abuts against the limiting piece, and the other end of the elastic piece directly or indirectly abuts against the valve rod. The check valve has the advantages that when the static valve element and / or the movable valve element are / is abraded or loosened, the limiting piece can provide pressing force for the compensation structure, so that the compensation structure can apply axial force to the valve rod, the displacement loss of the movable valve element can be compensated, the movable valve element and the static valve element are tightly attached, and inner leakage is prevented.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a gate valve. Background Technology

[0002] Gate valves are commonly used in piping systems to shut off the flow of power. A gate valve consists of a valve body assembly, a valve stem, a moving valve core, and a stationary valve core. The stationary valve core is located at the valve port and communicates with it through a connecting hole. The valve stem is connected to the moving valve core. Rotating the valve stem causes the moving valve core to rotate, blocking the connecting hole and thus sealing the valve port. When it is necessary to reconnect the piping system, rotating the valve stem causes the moving valve core to rotate, opening the connecting hole and thus closing or opening the gate valve.

[0003] In related technologies, when the moving valve core rotates on the stationary valve core, the moving valve core and / or the stationary valve core are prone to wear or loosening during long-term operation, resulting in insufficient sealing performance between the moving valve core and the stationary valve core, which leads to internal leakage of the shut-off valve. Utility Model Content

[0004] In view of this, it is necessary to provide a shut-off valve that can enhance the sealing performance between the moving valve core and the stationary valve core.

[0005] This utility model provides a shut-off valve, including a valve tube, a valve stem, a moving valve core, and a stationary valve core. The valve tube has a valve port and an inner cavity. The moving valve core, the stationary valve core, and at least a portion of the valve stem are disposed in the inner cavity. The stationary valve core is disposed at the valve port and has a communicating hole communicating with the valve port. The moving valve core is disposed on the stationary valve core. One end of the valve stem is connected to the moving valve core and can drive the moving valve core to rotate to block or open the communicating hole. The shut-off valve also includes a limiting member and a compensation structure disposed in the inner cavity. The limiting member is fixedly connected to the inner wall of the valve tube. Along the axial direction of the valve tube, the limiting member abuts against the side of the compensation structure away from the stationary valve core, and the side of the compensation structure close to the stationary valve core abuts against the valve stem. The compensation structure includes an elastic member. One end of the elastic member directly or indirectly abuts against the limiting member, and the other end of the elastic member directly or indirectly abuts against the valve stem.

[0006] With this configuration, when the stationary valve core and / or the moving valve core wear or loosen, the elastic element can apply an axial force to the valve stem through the squeezing of the limiting element. This can compensate for the displacement loss of the moving valve core and / or the stationary valve core, making the moving valve core and the stationary valve core fit tightly together. This prevents the medium from flowing in from the gap between them and causing internal leakage, thereby enhancing the sealing effect when the gate valve is closed.

[0007] In one embodiment, the limiting member includes a straight section and a vertical section. The vertical section surrounds the periphery of the straight section and extends toward the valve port. The outer wall of the vertical section abuts against the inner wall of the valve pipe. The inner diameter of the vertical section is larger than the inner diameter of the straight section. At least a portion of the compensation structure extends into the vertical section and abuts against the straight section. The inner wall of the vertical section abuts against the outer wall of at least a portion of the compensation structure.

[0008] Understandably, the straight section is used to apply an axial force to the compensation structure, while the vertical section is used to apply a force toward the valve stem's central axis to limit the compensation structure, thereby limiting the valve stem to prevent it from shifting and causing internal leakage between the stationary and moving valve cores.

[0009] In one embodiment, one end of the valve tube is open, the opening is in communication with the inner cavity, the limiting member is disposed at the opening, and the end face of the limiting member away from the valve port protrudes or retracts relative to the end face of the opening, so that a positioning step is formed between the end face of the limiting member and the end face of the opening, and the limiting member is welded at the positioning step; or, the end face of the limiting member away from the valve port is flush with the end face of the opening, and the limiting member is welded at the opening.

[0010] It is understandable that the limiting component can be recessed or protruded from the valve tube end face to form a positioning step. Welding can be performed directly at the positioning step. The limiting component and the valve tube end face are flush. When the limiting component is tightened, the valve tube end face can be used as a reference for the preset pressure value.

[0011] In one embodiment, the compensation structure further includes a thrust assembly, and the valve stem includes a large-diameter portion and a small-diameter portion, wherein the outer diameter of the large-diameter portion is larger than the outer diameter of the small-diameter portion, so that a first step is formed between the large-diameter portion and the small-diameter portion;

[0012] The thrust assembly abuts against the first step, and the elastic element is disposed between the limiting element and the thrust assembly. One end of the elastic element abuts against the limiting element, and the other end abuts against the thrust assembly.

[0013] Alternatively, the elastic element abuts against the first step, and the thrust assembly is disposed between the elastic element and the limiting element, with one end of the thrust assembly directly or indirectly abutting against the elastic element and the other end abutting against the limiting element.

[0014] In one embodiment, the thrust assembly abuts against the first step, and the elastic element is disposed between the limiting element and the thrust assembly;

[0015] The limiting member has a receiving groove on its end face facing the static valve core. The elastic member is disposed in the receiving groove. The groove wall of the receiving groove has a stop part that can abut against the thrust assembly. When the elastic member is in its natural state without being compressed, the height of the elastic member is H1. The distance from the point where the thrust assembly contacts the stop part to the bottom of the receiving groove is H2, and H2 is less than H1.

[0016] With this configuration, the thrust assembly and the elastic element can generate a mutual compressive elastic force.

[0017] In one embodiment, the elastic member abuts against the first step, and the thrust assembly is disposed between the elastic member and the limiting member;

[0018] A gasket is provided between the thrust assembly and the elastic element, and the outer diameter of the gasket is larger than the outer diameter of the end of the thrust assembly near the stationary valve core.

[0019] It is understandable that, since the outer diameter of the thrust bearing is smaller than that of the spring, the axial force is transmitted to the spring through a shim with a larger outer diameter, which can ensure the stability of the force transmission.

[0020] In one embodiment, the elastic member abuts against the first step, and the thrust assembly is disposed between the elastic member and the limiting member;

[0021] The compensation structure further includes a connector. The thrust assembly includes a second fixed seat. The connector is disposed between the second fixed seat and the valve stem. The connector is sleeved outside the small diameter portion. The outer wall of the second fixed seat is connected to the cavity wall of the inner cavity. The outer wall of the connector abuts against the inner wall of the second fixed seat. The inner wall of the connector abuts against the outer wall of the small diameter portion and is movably connected to the valve stem.

[0022] It is understandable that, since the second fixed seat is fixed in the axial direction, the valve stem is set to be movable, thereby providing a certain space for the elastic element to rebound and preventing the elastic element from jamming and failing.

[0023] In one embodiment, the connector is a needle roller bearing, which includes a main body and a plurality of elongated mounting grooves circumferentially provided in the main body. The mounting grooves are provided with needle rollers, which abut against the valve stem. The height of the needle rollers is less than the height of the mounting grooves.

[0024] In one embodiment, the thrust assembly abuts against the first step, the elastic element is disposed between the limiting element and the thrust assembly, the thrust assembly includes a thrust bearing and a first fixed seat, one end of the thrust bearing abuts against the first step, and the other end abuts against the first fixed seat, the first fixed seat is disposed between the limiting element and the thrust bearing, and abuts against the limiting element;

[0025] Alternatively, the elastic element abuts against the first step, and the thrust assembly is disposed between the elastic element and the limiting element. The thrust assembly includes a thrust bearing and a second fixed seat, with one end of the thrust bearing abutting against the second fixed seat and the other end abutting against the elastic element.

[0026] This configuration enables the transmission of axial upward thrust.

[0027] In one embodiment, the elastic element is a disc-shaped spring, with the outer surface of the disc-shaped spring facing the stationary valve core.

[0028] This invention incorporates a compensation structure that abuts against the valve stem axially. A limiting component generates a clamping force on the compensation structure, which in turn exerts an axial force on the valve stem. When the stationary and moving valve cores wear or loosen, the compensation structure compensates for the displacement loss of the moving and / or stationary valve cores, causing the moving valve core to move towards and tightly fit against the stationary valve core. Furthermore, the compensation structure axially limits the valve stem, thereby enhancing the sealing effect and preventing internal leakage. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A cross-sectional view of the shut-off valve in Embodiment 1 of this utility model;

[0031] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0032] Figure 3 This is a cross-sectional view of a shut-off valve in Embodiment 1 where no connecting piece is provided between the first fixed seat and the valve stem;

[0033] Figure 4 A cross-sectional view of the shut-off valve with an O-ring installed on the first fixed seat and valve stem in Embodiment 1;

[0034] Figure 5 A three-dimensional view showing the fit between the limiting component and the valve stem;

[0035] Figure 6 This is a cross-sectional view of the shut-off valve in Embodiment 2;

[0036] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0037] Figure 8 A cross-sectional view of the shut-off valve in Embodiment 2, in which the second fixed seat and the limiting member are integrally set;

[0038] Figure 9 This is a schematic diagram of a needle roller bearing.

[0039] Reference numerals: 100, gate valve; 10, valve body assembly; 11, valve port; 12, inner cavity; 13, valve pipe; 131, opening; 1311, positioning step; 132, threaded ring; 14, valve seat; 15, cover; 151, main body; 152, flange; 20, valve stem; 21, small diameter section; 211, plane; 22, large diameter section; 23, first step; 30, moving valve core; 40, stationary valve core; 41, connecting hole; 50, first connecting pipe; 60, second connecting pipe; 70, compensation structure; 71, limiting element; 711a, mounting hole; 712, limiting part; 7 13. Receiving groove; 714. Stop; 715. Second baffle; 715a. Straight section; 715b. Vertical section; 716. Second fixed seat; 7161. Second step; 72. Elastic element; 721. Conical surface; 73. Thrust assembly; 731. First fixed seat; 7311. First baffle; 7312. Second protrusion; 732. Thrust bearing; 7321. First shaft ring; 7322. Second shaft ring; 7323. Ball; 733. Shim; 74. Connector; 741. Needle roller bearing; 742. Bearing body; 743. Mounting groove; 744. Needle roller. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0041] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0045] Please see Figures 1-9 This utility model provides a shut-off valve 100, which is installed in a pipeline system for cutting off or connecting the pipeline system. The pipeline system can be a refrigeration system, a water system, etc.

[0046] The shut-off valve 100 includes a valve body assembly 10, a valve stem 20, a moving valve core 30, and a stationary valve core 40. The valve body assembly 10 has a valve port 11 and an inner cavity 12. The moving valve core 30, the stationary valve core 40, and at least part of the valve stem 20 are disposed in the inner cavity 12. The stationary valve core 40 is disposed at the valve port 11 and has a connecting hole 41 that communicates with the valve port 11. The moving valve core 30 is connected to one end of the valve stem 20 and is disposed on the stationary valve core 40. The rotation of the valve stem 20 drives the moving valve core 30 to rotate, so that the moving valve core 30 can block or unblock the connecting hole 41, thereby realizing the closing or opening of the shut-off valve 100.

[0047] The valve body assembly 10 includes a valve tube 13 and a valve seat 14. The valve seat 14 is located inside the valve tube 13, and the valve port 11 is opened on the valve seat 14. The valve seat 14 and the valve tube 13 are separately disposed. The valve seat 14 and the valve tube 13 are machined separately and then connected by laser welding to reduce the processing difficulty.

[0048] Valve body assembly 10 also includes a cover 15, which covers the valve tube 13 and is connected to the valve tube 13.

[0049] The cover 15 includes a main body 151 and a flange 152. The main body 151 and the valve pipe 13 are fixedly connected by the flange 152. The separate design can reduce the difficulty of processing.

[0050] The valve tube 13, the flange 152, and the cover 15 are all made of stainless steel and are connected by laser welding, which can improve processing efficiency.

[0051] The valve tube 13 has an opening 131 at one end near the housing cover 15. One end of the valve stem 20 is located inside the valve tube 13, and the other end extends out of the opening 131 and into the housing cover 15. The opening 131 is connected to the inner cavity 12.

[0052] The valve stem 20 includes a large-diameter portion 22 and a small-diameter portion 21 connected to each other. The diameter of the large-diameter portion 22 is larger than the diameter of the small-diameter portion 21, so that a first step 23 is formed between the large-diameter portion 22 and the small-diameter portion 21. The moving valve core 30 is connected to one end of the large-diameter portion 22.

[0053] The shut-off valve 100 also includes a motor (not shown), which is located inside the housing 15. One end of the valve stem 20 extends out from the opening 131 and is connected to the motor. The motor drives the valve stem 20 to rotate.

[0054] The shut-off valve 100 also includes a first connecting pipe 50 and a second connecting pipe 60. The first connecting pipe 50 and the second connecting pipe 60 are respectively connected to the valve pipe 13. The first connecting pipe 50 is connected to the valve port 11, and the second connecting pipe 60 is connected to the inner cavity 12. When the moving valve core 30 blocks the connecting hole 41, the second connecting pipe 60 is isolated from the valve port 11. When the moving valve core 30 releases the blockage of the connecting hole 41, the second connecting pipe 60 is connected to the valve port 11 through the inner cavity 12. The first connecting pipe 50 is the inlet, and the second connecting pipe 60 is the outlet, or the first connecting pipe 50 is the outlet, and the second connecting pipe 60 is the inlet.

[0055] The shut-off valve 100 also includes a compensation structure 70 and a limiting member 71. The limiting member 71 is fixedly connected to the valve pipe 13. The compensation structure 70 is located in the inner cavity 12. The side of the compensation structure 70 away from the stationary valve core 40 abuts against the limiting member 71, and the other side of the compensation structure 70 abuts against the valve stem 20. The limiting member 71 holds the compensation structure 70, so that the compensation structure 70 applies force to the valve stem 20, and the compensation structure 70 axially limits the valve stem 20, so that the moving valve core 30 has a force that moves toward the stationary valve core 40. Understandably, the moving valve core 30 rotates on the stationary valve core 40. During prolonged operation, both may wear or loosen. By setting a limiting element 71 and a compensation structure 70, the limiting element 71 is fixedly connected to the valve pipe 13, providing clamping force. This allows the compensation structure 70 to apply force to the valve stem 20, ensuring that the moving valve core 30 remains tightly fitted to the stationary valve core 40. This prevents the medium from entering through the gap between the stationary valve core 40 and the moving valve core 30, thus preventing internal leakage of the shut-off valve 100. The limiting element 71 can be a ring-shaped component such as a retaining ring, snap ring, nut, or bushing.

[0056] The compensation structure 70 includes an elastic element 72 and a limiting element 71 located at the opening 131 and connected to the inner wall of the opening 131, thereby generating pressure on the compensation structure 70. The elastic element 72 is located between the limiting element 71 and the valve stem 20, along the axial direction of the valve tube 13. One end of the elastic element 72 directly or indirectly abuts against the side of the limiting element 71 near the moving valve core 30, and the other end directly or indirectly abuts against the valve stem 20. The pressure generated by the limiting element 71 can squeeze the elastic element 72, causing the elastic element 72 to undergo elastic deformation, thereby applying a spring force to the valve stem 20. When wear or loosening occurs between the moving valve core 30 and the stationary valve core 40, the spring force of the elastic element 72 can compensate for the displacement loss of the moving valve core 30 and the stationary valve core 40, making the moving valve core 30 and the stationary valve core 40 fit tightly. Furthermore, the elastic element 72 can rebound, preventing the force generated by the limiting element 71 from being too large and increasing the friction between the moving valve core 30 and the stationary valve core 40.

[0057] In one embodiment, the end face of the limiting member 71 away from the valve port 11 protrudes or retracts relative to the end face of the opening 131. A positioning step 1311 is formed between the end faces of the limiting member 71 and the valve tube 13. The limiting member 71 is welded at the positioning step 1311. The positioning step 1311 is used for positioning during welding. A preset required pressure is applied to the limiting member 71 by a press or tooling fixture.

[0058] In another embodiment, the end face of the limiting member 71 away from the valve port 11 is flush with the end face of the opening 131, and the limiting member 71 is welded together. With this arrangement, when pressing the limiting member 71, the end face of the opening 131 can be used as a reference for applying a preset pressure value.

[0059] In one embodiment, the elastic element 72 is a disc-shaped spring. The disc-shaped spring is relatively flat, which can save axial space and has a long fatigue life. In other embodiments, the elastic element 72 may also be a spring or other elastic element 72 that can generate axial elastic force.

[0060] The disc-shaped spring has a conical surface 721, which is the outer side of the disc-shaped spring facing the static valve core 40. The pressure of the limiting member 71 squeezes the disc-shaped spring, causing it to deform. Its conical surface 721 generates an axial elastic force downward.

[0061] Example 1

[0062] Please see Figures 1-5 The limiting member 71 has a mounting hole 711a, the valve stem 20 passes through the mounting hole 711a and extends out of the mounting hole 711a, and the inner wall of the mounting hole 711a is provided with a limiting part 712, which can abut against the valve stem 20 to limit the circumferential rotation of the valve stem 20.

[0063] The side of one end of the small diameter portion 21 has two parallel planes 211. The limiting portion 712 is a first protrusion. There are two first protrusions. During the rotation of the valve stem 20, the two planes 211 of the small diameter portion 21 can respectively abut against the two first protrusions to limit the rotation of the valve stem 20 within a range of 90°.

[0064] The compensation structure 70 also includes a thrust assembly 73, one end of which abuts against the first step 23. An elastic element 72 is disposed between the thrust assembly 73 and the limiting element 71, one end of which abuts against the thrust assembly 73 and the other end of which abuts against the limiting element 71. The pressure generated by the limiting element 71 compresses the elastic element 72, and the elastic element 72 applies pressure to the thrust assembly 73. The thrust assembly 73 transmits the pressure through the first step 23, causing the valve stem 20 to generate a downward force.

[0065] Please continue reading Figure 1 and Figure 2The limiting member 71 has a receiving groove 713 on the end face facing the static valve core 40, and the elastic member 72 is provided in the receiving groove 713 to prevent the elastic member 72 from falling out.

[0066] The receiving groove 713 has a stop 714 on its wall that can abut against the thrust assembly 73. When the elastic member 72 is in its natural, uncompressed state, the height of the elastic member 72 is H1, and the distance from the point where the thrust assembly 73 contacts the stop 714 to the bottom of the receiving groove 713 is H2, where H2 is less than H1. Thus, the thrust assembly 73 and the elastic member 72 can generate a mutual compressive force. If H2 is greater than H1, the stop 714 abuts against the fixing member before the limiting member 71 and the thrust assembly 73 have interacted to compress the elastic member 72, and the elastic member 72 cannot be compressed to generate a spring force.

[0067] The stop portion 714 is an inclined surface. Of course, the stop portion 714 can also be a limiting step or other structure that can abut against the thrust assembly 73.

[0068] The limiting member 71 includes a straight section 715a and a vertical section 715b. The vertical section 715b is connected to the straight section 715a and surrounds the periphery of the straight section 715a. The vertical section 715b extends toward the stationary valve core 40 and encloses at least part of the thrust assembly 73. The outer side of the straight section 715a abuts against the inner wall of the valve pipe 13, and the end face of the straight section 715a toward the stationary valve core 40 abuts against the elastic member 72. The vertical section 715b limits the thrust assembly 73, thereby ensuring that the valve stem 20 will not deviate during use.

[0069] The inner diameter of the vertical section 715b is larger than that of the horizontal section 715a, allowing the horizontal section 715a to abut against the elastic member 72, and at least a portion of the thrust assembly 73 to extend into the vertical section 715b. A receiving groove 713 is formed within the vertical section 715b, and a stop portion 714 is provided on the inner wall of the vertical section 715b and at the opening of the receiving groove 713.

[0070] The thrust assembly 73 includes a first fixed seat 731 and a thrust bearing 732. The valve stem 20 passes sequentially through the first fixed seat 731 and the thrust bearing 732. The first fixed seat 731 is located between the thrust bearing 732 and the limiting member 71. The thrust bearing 732 is located on the first step 23. The thrust bearing 732 is used to transmit the axial force generated by the elastic member 72 to the moving valve core 30. The vertical section 715b partially encloses the outer wall of the first fixed seat 731.

[0071] Please see Figure 3A clearance fit is provided between the first fixed seat 731 and the valve stem 20 to reduce friction during valve stem 20 rotation. Alternatively, the compensation structure 70 may also include a connecting member 74, located between the first fixed seat 731 and the valve stem 20. The outer wall of the connecting member 74 abuts against the inner wall of the first fixed seat 731, and the inner wall of the connecting member 74 abuts against the valve stem 20. The connecting member 74 may be a needle roller bearing 741, a ball bearing, or an O-ring. Please refer to [link to relevant documentation]. Figure 4 .

[0072] The first fixed seat 731 extends towards the stationary valve core 40 at one end to form a first baffle 7311. The first baffle 7311 covers at least part of the thrust bearing 732 and abuts against the thrust bearing 732 to limit the thrust bearing 732.

[0073] The first fixed seat 731 has a second protrusion 7312 at the end away from the static valve core 40. The elastic element 72 is a spring sheet. The second protrusion 7312 extends into the inner ring of the spring sheet. When the spring sheet is squeezed, the side wall of the receiving groove 713 squeezes the spring sheet, and the spring sheet abuts against the second protrusion 7312. The spring sheet applies a force to the second protrusion 7312 toward the central axis of the valve stem 20, which can limit the first fixed seat 731 and further prevent the valve stem 20 from deviating.

[0074] The first fixed seat 731 is not fixedly connected to the valve pipe 13. The outer wall of the first fixed seat 731 and the inner wall of the valve pipe 13 are in clearance fit. It is in a floating state in the axial direction. When the elastic element 72 is squeezed, the first fixed seat 731 can move slightly to transmit the axial force to the thrust bearing 732. At the same time, it provides a certain amount of room for the elastic element 72 to rebound, preventing the elastic element 72 from getting stuck.

[0075] The inner ring of the thrust bearing 732 at least partially abuts against the valve stem 20 to enhance the concentricity of the valve stem 20.

[0076] The thrust bearing 732 includes a first shaft ring 7321, a second shaft ring 7322, and balls 7323. The first shaft ring 7321 abuts against the first fixed seat 731, the outer wall of the first shaft ring 7321 abuts against the second stop portion 714, and the balls 7323 are disposed between the first shaft ring 7321 and the second shaft ring 7322.

[0077] The inner ring of the second shaft ring 7322 abuts against the valve stem 20, and the inner wall of the first shaft ring 7321 is in clearance fit with the valve stem 20. This not only reduces the friction when the valve stem 20 rotates, but also limits the radial movement of the valve stem 20, ensuring the concentricity of the valve stem 20. The moving valve core 30 can completely seal the connecting hole 41 to prevent internal leakage.

[0078] Example 2

[0079] Please see Figures 6-9This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The differences are as follows:

[0080] The elastic member 72 abuts against the first step 23, and the thrust assembly 73 is disposed between the elastic member 72 and the limiting member 71. One end of the thrust assembly 73 abuts directly or indirectly against the elastic member 72, and the other end abuts against the limiting member 71.

[0081] The thrust assembly 73 includes a second fixed seat 716, which is fixedly connected to the cavity wall of the inner cavity 12.

[0082] One end of the second fixed seat 716 extends toward the stationary valve core 40 to form a second baffle 715. The inner diameter of the second baffle 715 is larger than the inner diameter of the second fixed seat 716. The second baffle 715 at least partially surrounds the thrust assembly 73.

[0083] In one embodiment, a threaded ring 132 is provided inside the valve tube 13, and the second fixing seat 716 is threadedly connected to the threaded ring 132 for easy assembly. A limiting member 71 is provided at the end of the second fixing seat 716 away from the stationary valve core 40 to prevent the second fixing seat 716 from loosening and falling out. A tool hole (not shown) is provided on the end face of the second fixing seat 716 away from the stationary valve core 40 for the insertion of external tools. The installer rotates the second fixing seat 716 through the tool hole to thread it with the threaded ring 132. There can be two or more tool holes.

[0084] In another embodiment, please refer to Figure 8 The second fixed seat 716 and the limiting member 71 are integrally set and connected to the valve pipe 13 by pressure welding the limiting member 71 to the valve pipe 13.

[0085] The elastic element 72 is located between the large diameter portion 22 and the thrust bearing 732, and the elastic element 72 is a spring sheet.

[0086] Further, please see Figure 6 and Figure 7 The thrust assembly 73 includes a thrust bearing 732, a second fixed seat 716 abutting against the thrust bearing 732, a gasket 733 between the thrust bearing 732 and the elastic element 72, a second baffle 715 surrounding part of the thrust bearing 732, and the gasket 733 being located between the thrust bearing 732 and the elastic element 72. The outer diameter of the gasket 733 is larger than the outer diameter of the thrust bearing 732. Because the outer diameter of the thrust bearing 732 is smaller than the outer diameter of the elastic element, the axial force is transmitted to the elastic element through the larger outer diameter gasket 733, ensuring the stability of force transmission.

[0087] The first and second shaft rings 7321 and 7322 of the thrust bearing 732 are both clearance-fitted with the valve stem 20 to reduce the friction when the valve stem 20 rotates.

[0088] A connector 74 is provided between the second fixed seat 716 and the valve stem 20. The connector 74 is sleeved on the outside of the valve stem 20. The outer wall of the connector 74 abuts against the inner wall of the second fixed seat 716. The inner wall of the connector 74 and the valve stem 20 are movably connected, and the valve stem 20 can move up and down, thereby providing a certain rebound space for the elastic element 72 and preventing the elastic element 72 from jamming and failing.

[0089] The second fixed seat 716 has a second step 7161, one end of the connector 74 abuts against the second step 7161, and the second step 7161 limits the connector 74; or, the second step 7161 is not provided in the second fixed seat 716, and the connector 74 abuts directly against the thrust bearing 732.

[0090] In one embodiment, please refer to Figure 9 The connecting member 74 is a needle roller bearing 741. The needle roller bearing 741 includes a bearing body 742. The bearing body 742 has multiple elongated mounting grooves 743 in the circumferential direction. The mounting grooves 743 are provided with needle rollers 744. The needle rollers 744 abut against the valve stem 20. The height of the needle rollers 744 is less than the height of the mounting grooves 743 so that the valve stem 20 can move up and down. At the same time, the needle roller bearing 741 can reduce the friction when the valve stem 20 rotates.

[0091] In the axial direction, the gap between the needle roller 744 and the mounting groove 743 is less than the maximum compression height of the elastic element 72. If the gap is too large, the elastic element 72 will be unable to compress the valve stem 20.

[0092] The technical features of the above-described embodiments of the utility model can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A shut-off valve, comprising a valve tube (13), a valve stem (20), a moving valve core (30), and a stationary valve core (40), wherein the valve tube (13) has a valve port (11) and an inner cavity (12), the moving valve core (30), the stationary valve core (40), and at least a portion of the valve stem (20) are disposed in the inner cavity (12), the stationary valve core (40) is disposed at the valve port (11) and has a communication hole (41) communicating with the valve port (11), the moving valve core (30) is disposed on the stationary valve core (40), and one end of the valve stem (20) is connected to the moving valve core (30) and is capable of driving the moving valve core (30) to rotate to block or open the communication hole (41); Its features are, The shut-off valve further includes a limiting member (71) and a compensation structure (70) disposed in the inner cavity (12). The limiting member (71) is fixedly connected to the inner wall of the valve tube (13). Along the axial direction of the valve tube (13), the limiting member (71) abuts against the side of the compensation structure (70) away from the stationary valve core (40), and the side of the compensation structure (70) close to the stationary valve core (40) abuts against the valve stem (20). The compensation structure (70) includes an elastic member (72). One end of the elastic member (72) abuts directly or indirectly against the limiting member (71), and the other end of the elastic member (72) abuts directly or indirectly against the valve stem (20).

2. The shut-off valve according to claim 1, characterized in that, The limiting member (71) includes a straight section (715a) and a vertical section (715b). The vertical section (715b) surrounds the periphery of the straight section (715a) and extends toward the valve port (11). The outer wall of the vertical section (715b) abuts against the inner wall of the valve pipe (13). The inner diameter of the vertical section (715b) is larger than the inner diameter of the straight section (715a). At least a portion of the compensation structure (70) extends into the vertical section (715b) and abuts against the straight section (715a). The inner wall of the vertical section (715b) abuts against the outer wall of at least a portion of the compensation structure (70).

3. The shut-off valve according to claim 1, characterized in that, The valve tube (13) has an opening (131) at one end, which communicates with the inner cavity (12). The limiting member (71) is located at the opening (131). The end face of the limiting member (71) away from the valve port (11) protrudes or retracts relative to the end face of the opening (131) so that a positioning step (1311) is formed between the end face of the limiting member (71) and the end face of the opening (131). The limiting member (71) is welded at the positioning step (1311). Alternatively, the end face of the limiting member (71) away from the valve port (11) is flush with the end face of the opening (131), and the limiting member (71) is welded to the opening (131).

4. The shut-off valve according to claim 1, characterized in that, The compensation structure (70) further includes a thrust assembly (73), and the valve stem (20) includes a large-diameter portion (22) and a small-diameter portion (21), wherein the outer diameter of the large-diameter portion (22) is larger than the outer diameter of the small-diameter portion (21) so that a first step (23) is formed between the large-diameter portion (22) and the small-diameter portion (21); The thrust assembly (73) abuts against the first step (23), and the elastic member (72) is disposed between the limiting member (71) and the thrust assembly (73). One end of the elastic member (72) abuts against the limiting member (71), and the other end abuts against the thrust assembly (73). Alternatively, the elastic element (72) abuts against the first step (23), and the thrust assembly (73) is disposed between the elastic element (72) and the limiting element (71), with one end of the thrust assembly (73) directly or indirectly abutting against the elastic element (72) and the other end abutting against the limiting element (71).

5. The shut-off valve according to claim 4, characterized in that, The thrust assembly (73) abuts against the first step (23), and the elastic member (72) is disposed between the limiting member (71) and the thrust assembly (73); The limiting member (71) has a receiving groove (713) on its end face facing the static valve core (40). The elastic member (72) is located in the receiving groove (713). The groove wall of the receiving groove (713) has a stop (714) that can abut against the thrust assembly (73). When the elastic member (72) is in its natural state without being compressed, the height of the elastic member (72) is H1. The distance from the point where the thrust assembly (73) contacts the stop (714) to the bottom of the receiving groove (713) is H2, and H2 is less than H1.

6. The shut-off valve according to claim 4, characterized in that, The elastic element (72) abuts against the first step (23), and the thrust assembly (73) is disposed between the elastic element (72) and the limiting element (71); A gasket (733) is provided between the thrust assembly (73) and the elastic element (72), and the outer diameter of the gasket (733) is larger than the outer diameter of the end of the thrust assembly (73) near the static valve core (40).

7. The shut-off valve according to claim 4, characterized in that, The elastic element (72) abuts against the first step (23), and the thrust assembly (73) is disposed between the elastic element (72) and the limiting element (71); The compensation structure (70) further includes a connector (74). The thrust assembly (73) includes a second fixed seat (716). The connector (74) is disposed between the second fixed seat (716) and the valve stem (20). The connector (74) is sleeved on the outside of the small diameter portion (21). The outer wall of the second fixed seat (716) is connected to the cavity wall of the inner cavity (12). The outer wall of the connector (74) abuts against the inner wall of the second fixed seat (716). The inner wall of the connector (74) abuts against the outer wall of the small diameter portion (21) and is movably connected to the valve stem (20).

8. The shut-off valve according to claim 7, characterized in that, The connector (74) is a needle roller bearing (741). The needle roller bearing (741) includes a main body (151). The main body (151) has a plurality of elongated mounting grooves (743) in the circumferential direction. The mounting grooves (743) are provided with needle rollers (744). The needle rollers (744) abut against the valve stem (20). The height of the needle rollers (744) is less than the height of the mounting grooves (743).

9. The shut-off valve according to claim 4, characterized in that, The thrust assembly (73) abuts against the first step (23), the elastic member (72) is disposed between the limiting member (71) and the thrust assembly (73), the thrust assembly (73) includes a thrust bearing (732) and a first fixed seat (731), one end of the thrust bearing (732) abuts against the first step (23) and the other end abuts against the first fixed seat (731), the first fixed seat (731) is disposed between the limiting member (71) and the thrust bearing (732) and abuts against the limiting member (71); Alternatively, the elastic element (72) abuts against the first step (23), and the thrust assembly (73) is disposed between the elastic element (72) and the limiting element (71). The thrust assembly (73) includes a thrust bearing (732) and a second fixed seat (716). One end of the thrust bearing (732) abuts against the second fixed seat (716), and the other end abuts against the elastic element (72).

10. The shut-off valve according to claim 1, characterized in that, The elastic element (72) is a disc-shaped spring, and the outer side of the disc-shaped spring is disposed facing the static valve core (40).

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