Stop valve

Abstract

Disclosed is a stop valve (100), comprising a valve body (10), a valve seat (20) and a valve core (30), wherein a channel for flow of a medium is formed in the valve body (10); the valve seat (20) is mounted in the valve body (10), the valve seat (20) is provided with a valve cavity (21), the valve cavity (21) being provided with a valve port (213) in communication with the channel; the valve core (30) is mounted in the valve body (10), and at least part of the valve core (30) can extend into the valve seat (20) and move closer to or away from the valve port (213); a threaded part (222) is arranged in the valve seat (20), and the peripheral side of the valve core (30) is provided with a thread matching the threaded part (222), the threaded part (222) extending from the valve port (213) towards the valve core (30). In the stop valve, during the movement of the valve core, misalignment of the valve core can be prevented.

Description

stop valve

[0001] Related applications

[0002] This application claims priority to Chinese patent applications with application number 202420354083.3, filed on February 26, 2024, and with invention name “Stop Valve”; and application number 202421483038.4, filed on June 26, 2024, and with invention name “Stop Valve”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of refrigeration, and in particular to a stop valve. Background Art

[0004] Stop valves are widely used in refrigeration system pipelines to switch the medium flowing in the pipelines on and off.

[0005] Stainless steel stop valves in related art typically include a valve body and a valve core. The valve core is installed in the valve body, with an external thread provided at the top of the valve core and an internal thread provided within the valve body that mates with the external thread on the valve core, thereby enabling the valve core to move within the valve body. See Figure 2, which is a cross-sectional view of a stop valve in related art. The valve body has a threaded portion that mates with the valve core through the threaded portion. However, because the threaded portion is relatively far from the valve port that the valve core needs to seal, the valve core is prone to deviation during movement toward the valve port, resulting in a gap between the valve core and the valve port. Furthermore, the valve body and valve seat cannot meet the requirements of concentricity and coaxiality, which can lead to problems such as poor sealing and media leakage. Summary of the Invention

[0006] Based on this, the present application provides a stop valve to address the above technical issues.

[0007] A stop valve, which comprises: a valve body, wherein the valve body is constructed with a channel for medium flow; a valve seat, which is installed in the valve body and is connected to the inner wall of the valve body to form the channel, the valve seat is provided with a valve cavity, and the valve cavity has a valve port connected to the channel; and a valve core, which is installed in the valve body, and at least part of the valve core is located in the valve seat and can move in the valve cavity; wherein, a threaded portion is provided in the valve seat, and a thread that cooperates with the threaded portion is provided on the outer peripheral side of the valve core, the threaded portion extends from the valve port toward the valve core, and the part of the valve core located in the valve seat is threadedly engaged with the threaded portion.

[0008] In one embodiment, the valve core includes a threaded section and a limiting section that are connected to each other; the threaded section extends into the valve cavity and is connected to the threaded portion of the valve seat, and the outer peripheral side of the limiting section is circumferentially abutted against the inner wall of the valve body or the inner wall of the valve seat.

[0009] In one embodiment, the valve cavity includes an installation cavity, a threaded cavity and the valve port that are interconnected. The inner wall of the threaded portion forms the threaded cavity, and the threaded cavity is located between the installation cavity and the valve port; the installation cavity, the threaded cavity and the valve port are coaxially and concentrically arranged, the threaded section is threadedly matched with the cavity wall of the threaded cavity, and the limiting section is located in the installation cavity and is slidably connected to the cavity wall of the installation cavity.

[0010] In one embodiment, a mounting hole is provided on the valve body, one end of the valve seat extends into the valve body through the mounting hole, and the other end is located outside the valve body.

[0011] In one embodiment, along the axial direction of the valve body, the mounting hole extends away from the mounting hole to form an extension portion, and the valve seat is fixedly connected to the extension portion; a first solder is provided on the extension portion, and a portion of the first solder is in contact with the valve seat.

[0012] In one embodiment, the valve cavity includes a threaded cavity and the valve port that are interconnected, the threaded cavity and the valve port are concentrically and coaxially arranged, and the inner wall of the threaded portion forms the threaded cavity; along the moving direction of the valve core, the valve body is provided with a matching cavity;

[0013] In which, the threaded section is threadedly matched with the cavity wall of the threaded cavity, the limiting section is located in the matching cavity, and is slidingly connected with the cavity wall of the matching cavity; the diameter of the limiting section is larger than the threaded section; a sealing groove is provided on the outer peripheral side of the limiting section, a sealing ring is embedded in the sealing groove, and the outer peripheral side of the sealing ring abuts against the inner wall of the valve body or the inner wall of the valve seat.

[0014] In one embodiment, a conical surface is provided on a circumferential edge of one end of the threaded section close to the valve opening, and the conical surface abuts against the valve opening.

[0015] In one embodiment, an inner wall of the valve seat forming the valve port is provided with a step protruding radially inward, and the valve core abuts against the step.

[0016] In one embodiment, the stop valve further includes a sealing end cover, which is provided at one end of the valve body away from the valve port, and at least a portion of the outer wall of the sealing end cover is sealed with the inner wall of the valve body or the inner wall of the valve cavity.

[0017] In one embodiment, the stop valve further comprises a dust cap, the dust cap is provided with a stud, the sealing end cover is provided with a screw hole, the stud is inserted into the screw hole and is threadedly connected; and / or, the screw hole is opened on the axis of the sealing end cover, and a boss is provided on the end surface of the valve core facing away from the valve port, the boss is coaxially arranged with the screw hole, and the boss abuts against the hole wall of the screw hole.

[0018] In one embodiment, the valve seat is further provided with a first opening along a first direction, the first opening is communicated with the valve port, the portion between the first opening and the valve port forms the valve cavity for the valve core to move, and the valve core is installed in the valve cavity through the first opening; the valve seat is provided with a flow cavity along a second direction, the flow cavity passes through both ends of the valve seat in the second direction and is communicated with the valve cavity; wherein the first direction and the second direction are set at an angle, and the first direction is in the same direction as the direction of movement of the valve core.

[0019] In one embodiment, the valve body is provided with a connecting port along the second direction, and the edge of the connecting port has a flange bent along the first direction. The stop valve also includes a second connecting pipe, which is connected to the inner wall of the connecting port formed by the flange and is connected to the channel.

[0020] In one embodiment, one end of the second connecting pipe close to the valve body extends toward the inside of the valve body and abuts against the outer peripheral side of the valve seat; and / or, the stop valve also includes a third solder, which is arranged on the flange and contacts the second connecting pipe for welding the flange and the second connecting pipe.

[0021] In one embodiment, a second annular groove is provided on the outer peripheral side of an end of the valve seat facing away from the valve core, a stop block is pressed onto the notch of the second annular groove, the groove wall of the second annular groove, the valve body and the stop block form a cavity, and a fifth solder is provided in the cavity; the stop block and the valve body are connected by welding; the stop valve also includes a first connecting pipe, a connecting port is provided on a side of the valve seat close to the valve port, and the first connecting pipe is inserted into the valve seat through the connecting port; a first annular groove is also provided on the outer peripheral wall of the valve seat close to the connecting port, and the stop block is sleeved on the first annular groove; the stop valve also includes a second solder, the second solder is provided on the first connecting pipe, and part of the second solder is in contact with the valve seat and the stop block.

[0022] In one embodiment, both ends of the valve seat along the moving direction of the valve core are in circumferential contact with the inner wall of the valve body; or, one end of the valve seat close to the valve port is in circumferential contact with the inner wall of the valve body.

[0023] Related Art The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to better describe and illustrate the embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered to limit the scope of the disclosed inventions, the presently described embodiments and / or examples, and any of the best modes currently understood for these inventions.

[0025] FIG1 is a cross-sectional view of one embodiment of the stop valve provided in this application.

[0026] FIG2 is a cross-sectional view of a stop valve in the related art.

[0027] FIG3 is a schematic structural diagram of the stop valve provided in this application.

[0028] FIG4 is a side view of the stop valve provided in this application.

[0029] FIG5 is a cross-sectional view taken along line AA in FIG2 .

[0030] FIG6 is a three-dimensional cross-sectional view along line AA in FIG2 .

[0031] FIG7 is a schematic diagram of the cooperation between the valve seat and the valve core in FIG4 .

[0032] FIG8 is a schematic structural diagram of the valve seat provided in this application.

[0033] FIG9 is a three-dimensional cross-sectional view of the valve seat provided in this application.

[0034] The symbols in the figure represent the following meanings: 100, stop valve; 10, valve body; 1001, matching cavity; 101, mounting hole; 102, extension portion; 12, first connecting pipe; 13, second connecting pipe; 14, first channel; 15, second channel; 16, connecting port; 161, flange; 20, valve seat; 222, threaded portion; 201, first annular groove; 202, second annular groove; 21, valve cavity; 211, mounting cavity; 212, threaded cavity; 213, valve port; 22, flow cavity; 23, first opening; 24, step; 25, second opening; 26, connecting port; 28, block; 29, opening ;30. Valve core;301. Threaded section;302. Limiting section;31. Top;311. Boss;312. Sealing groove;313. Sealing ring;32. Bottom;321. Conical surface;40. Valve nozzle;501. First solder;502. Second solder;503. Third solder;504. Fourth solder;505. Fifth solder;60. Sealing end cover;601. Screw hole;70. Dust cap;701. Stud;200. Existing stop valve;210. Valve body;2101. Threaded part;220. Valve seat;2201. Valve port;230. Valve core. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it may be directly on the other mechanism or there may be a central mechanism. When a mechanism is considered to be "connected to" another mechanism, it may be directly connected to the other mechanism or there may be a central mechanism at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0037] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0040] Please refer to Figure 2, which is a cross-sectional view of an existing stop valve 200 in the related art, which generally includes an existing valve body 210, an existing valve seat 220 and an existing valve core 230. The existing valve seat 220 is installed on the existing valve body 210, and an existing threaded portion 2101 is opened on the existing valve body 210, and threaded cooperation with the existing valve core 230 is achieved through the existing threaded portion 2101. However, since the existing threaded portion 2101 is far away from the existing valve port 2201 opened on the existing valve seat 220 that needs to be sealed by the existing valve core 230, the existing valve core 230 is prone to deviation during the process of moving toward the existing valve port 2201, resulting in a gap between the existing valve core 230 and the existing valve port 2201, which then causes problems such as poor sealing and medium leakage.

[0041] To this end, the present application provides a stop valve 100, which is used in the pipeline of the refrigeration system and can guide the movement of the valve core 30 throughout the entire stroke, thereby preventing the valve core 30 from being offset during the movement toward the valve port 212 and improving the concentricity of the valve core 30 and the valve port 213.

[0042] Referring to Figure 1 , the stop valve 100 includes a valve body 10, a valve seat 20, and a valve core 30. The valve body 10 is constructed with a passage for medium flow. The valve seat 20 is mounted within the valve body 10 and connected to the inner wall of the passage formed by the valve body 10. The valve seat 20 is provided with a valve cavity 21 having a valve port 213 communicating with the passage. The valve core 30 is mounted within the valve body 10, and at least a portion of the valve core 30 can extend into the valve seat 20 and move within the valve cavity 21 in a direction toward or away from the valve port 213. A threaded portion 222 is provided within the valve seat 20, and a thread that mates with the threaded portion 222 is provided on the outer circumference of the valve core 30. The threaded portion 222 extends from the valve port 213 toward the valve core 30, and the portion of the valve core 30 located within the valve seat 20 is threadedly engaged with the threaded portion 222.

[0043] In this way, a valve port 213 is provided on the valve seat 20, and the valve port 213 is connected to the channel in the valve body 10, so that the medium can flow in the stop valve 100 through the valve port 213. Therefore, the valve core 30 moves close to the valve port 213 and blocks the valve port 213 to close the stop valve 100, and moves away from the valve port 213 to open the valve port 213 to open the stop valve 100. At least part of the valve core 30 can extend into the valve seat 20, so the valve seat 20 can guide the valve core 30 extended therein, and a threaded portion 222 is provided in the valve seat 20, and a thread is provided on the outer peripheral side of the valve core 30, so the valve core 30 can be threadedly engaged with the threaded portion 222, thereby moving along the extension direction of the threaded portion 222, and the threaded portion 222 extends from the valve port 213 toward the valve core 30, that is, for the valve core 30, the threaded portion 222 extends from the end face thereof extending into the valve seat 20 all the way to the valve port 213, so that during the movement of the valve core 30 toward the valve port 213, the threaded portion 222 always threadably engages with the valve core 30 and guides the direction of its movement, preventing it from deflecting during the movement, so that the end face of the valve core 30 close to the valve port 213 is stably abutted against the valve port 213, thereby improving the concentricity of the valve core 30 and the valve port 213, thereby improving the sealing performance and avoiding problems such as medium leakage.

[0044] Specifically, the valve core 30 includes a threaded section 301 and a limiting section 302 connected to each other; the threaded section 301 extends into the valve cavity 21 and is connected to the threaded portion 222 of the valve seat 20, and the outer peripheral side of the limiting section 302 is circumferentially abutted against the inner wall of the valve body 10 or the inner wall of the valve seat 20.

[0045] For example, referring to FIG1 , in one embodiment, the outer circumference of the limiting segment 302 abuts the inner wall of the valve body 10, and the threaded segment 301 is capable of extending into the valve seat 20. The valve cavity 21 includes a threaded cavity 212 and a valve port 213 that are interconnected. The threaded cavity 212 and the valve port 213 are arranged concentrically and coaxially with each other. The inner wall of the threaded portion 222 forms the threaded cavity 212. Along the movement direction of the valve core 30, the valve body 10 is provided with a mating cavity 1001. The threaded segment 301 is threadedly mated with the cavity wall of the threaded cavity 212. The limiting segment 302 is located within the mating cavity 1001 and is slidably connected to the cavity wall of the mating cavity 1001.

[0046] It can be understood that in this embodiment, only one end of the valve seat 20 close to the valve port 213 along the moving direction of the valve core 30 is in circumferential contact with the inner wall of the valve body 10 .

[0047] Furthermore, the diameter of the limiting section 302 is larger than that of the threaded section 301. As the threaded section 301 moves toward the valve port 213, the limiting section 302 abuts against the valve seat 20. Thus, during the movement of the valve core 30, the valve core 30 is guided by the inner wall of the valve body 10 through the cooperation between the limiting section 302 and the inner wall of the valve body 10. Furthermore, since the outer circumference of the limiting section 302 abuts against the inner wall of the valve body 10, the sealing between the valve core 30 and the valve body 10 is ensured, preventing leakage of the medium from the position of the valve core 30. The threaded section 301 extends into the valve seat 20 and cooperates with the threaded portion 222, so that the movement direction of the valve core 30 is guided by the threaded portion 222.

[0048] A sealing groove 312 is formed on the outer circumference of the limiting section 302, and a sealing ring 313 is embedded in the sealing groove 312. The outer circumference of the sealing ring 313 abuts against the inner wall of the valve body 10. In this way, the sealing effect between the valve core 30 and the valve body 10 can be improved during the movement.

[0049] Furthermore, a tapered surface 321 is provided on the circumferential edge of one end of the threaded section 301 near the valve opening 213, and the tapered surface 321 abuts against the valve opening 213. Thus, due to the oblique arrangement of the tapered surface 321, the fit with the valve opening 213 is tighter, and gaps are less likely to form, thereby facilitating a hard seal between the valve core 30 and the valve opening 213.

[0050] Furthermore, the inner wall of the valve seat 20 forming the valve port 213 is radially inwardly protruded with a step 24, and the valve core 30 abuts against the step 24. Since the step 24 is protruded inwardly, its diameter is small, which facilitates abutment with the valve core 30.

[0051] The valve seat 20 is provided with a first opening 23 along a first direction, and the first opening 23 is connected to the valve port 213. The portion of the valve seat 20 between the first opening 23 and the valve port 213 forms a valve cavity 21 for the valve core 30 to move, and the threaded portion 222 is provided on the inner wall of the valve seat 20 forming the valve cavity 21; the valve seat 20 is provided with a flow cavity 22 along a second direction, and the flow cavity 22 passes through both ends of the valve seat 20 in the second direction; wherein the first direction and the second direction are arranged at an angle. In this way, the valve core 30 can enter the valve cavity 21 inside the valve seat 20 along the first opening 23, and realize threaded engagement with the threaded portion 222 on the inner wall of the valve seat 20 that forms the valve cavity 21. The flow cavity 22 is connected to the valve cavity 21, and the first direction and the second direction are arranged at an angle, that is, the flow cavity 22 and the valve cavity 21 are staggered. The medium entering the valve cavity 21 from the valve port 213 can flow into the flow cavity 22 and flow out from at least one of the openings at both ends of the valve seat 20 in the flow cavity 22. The opening and closing of the valve core 30 and the valve port 213 determines whether the medium can flow into the flow cavity 22 and flow from the flow cavity 22 to other external pipelines.

[0052] It should be explained that, referring to FIG. 1 , in this embodiment, the first direction is the movement direction of the valve core 30 , which is also the axial direction of the valve body 10 , and the second direction is the axial direction of the connecting pipe after the valve body 10 is connected to the connecting pipe.

[0053] In this embodiment, the first direction and the second direction are arranged at a right angle. In other embodiments, the first direction and the second direction can also be an acute angle or an obtuse angle, and the flow chamber 22 is tilted toward the valve port 213 or tilted away from the valve port 213 without affecting the realization of the technical effect of the present application.

[0054] Exemplarily, the shut-off valve 100 further includes a first connecting pipe 12, a second connecting pipe 13, and a valve 40. The first connecting pipe 12 is connected to one end of the valve body 10 near the valve port 213 and communicates with the valve port 213, allowing medium to flow into the valve port 213 through the first connecting pipe 12. The second connecting pipe 13 is connected to the valve body 10, coaxially arranged with the flow chamber 22, and communicates with the flow chamber 22. Medium can flow from the first connecting pipe 12 into the valve port 213, and then flow through the valve chamber 21 and the flow chamber 22 into the second connecting pipe 13. Medium can also flow from the second connecting pipe 13 into the flow chamber 22 and the valve chamber 21 within the valve seat 20, and then out through the valve port 213. The valve 40 is connected to the valve body 10, opposite the second connecting pipe 13, and also communicates with the flow chamber 22, for replenishing medium into the valve body 10.

[0055] Furthermore, the threads of the threaded cavity 212 extend along the valve port 213 to an end of the valve seat 20 that is relatively far away from the valve port 213. That is, the threaded portion 222 extends from one end of the valve cavity 21 to the other end of the valve cavity 21, that is, from the top end to the bottom end of the valve cavity 21. In this way, when the valve core 30 enters the valve cavity 21, it will engage with the threaded portion 222, and this threaded engagement continues until the valve core 30 abuts against the valve port 213 and stops moving. In other words, the threaded portion 222 always guides and limits the entire movement of the valve core 30 in the valve cavity 21, further ensuring the stability of the movement of the valve core 30, improving the concentricity of the valve core 30 and the valve port 213, and ensuring the close abutment of the valve core 30 and the valve port 213.

[0056] Of course, in other embodiments, the threaded portion 222 may also be spaced a certain distance from the end of the valve cavity 21 away from the valve port 213, that is, the end of the valve cavity 21 away from the valve port 213 does not have an internal thread, thereby facilitating the valve core 30 to enter the valve cavity 21.

[0057] Both ends of the valve seat 20 along the first direction are in circumferential contact with the inner wall of the valve body 10. Therefore, both ends of the valve seat 20 can be stably restrained by the inner wall of the valve body 10, making the installation of the valve seat 20 more stable and preventing the valve seat 20 from shifting, which in turn could cause the valve cavity 21 and the valve port 213 to shift, and further cause the valve core 30 and the valve port 213 to be less concentric.

[0058] The valve body 10 defines a communication port 16 along the second direction. The edge of the communication port 16 has a flange 161 bent along the first direction. The stop valve 100 also includes a second connecting pipe 13. The second connecting pipe 13 is connected to the inner wall of the communication port 16 formed by the flange 161 and communicates with the passage. The end of the second connecting pipe 13 closest to the valve body 10 extends into the valve body 10 and abuts the outer circumference of the valve seat 20. This flange increases the connection area between the valve body 10 and the second connecting pipe 13, enhancing the connection strength. In addition to being restrained by the inner wall of the valve body 10, the valve seat 20 is also abutted by the second connecting pipe 13. The abutment of the second connecting pipe 13 against the valve seat 20 prevents it from extending excessively into the valve body.

[0059] The stop valve 100 further includes a sealing end cap 60 and a dust cap 70. The sealing end cap 60 is disposed on the end of the valve body 10 away from the valve port 213. A screw hole 601 is defined in the sealing end cap 60, and a stud 701 protrudes from the dust cap 70. The stud 701 is movably connected to the wall of the screw hole 601 to connect the sealing end cap 60 and the dust cap 70. In this manner, the sealing end cap 60 is used to seal the passage within the valve body 10 to prevent leakage of the medium therein. The dust cap 70 is disposed on the outside of the sealing end cap 60 to prevent external dust from entering. Moreover, since the sealing end cover 60 and the dust cap 70 are connected by the screw hole 601 and the stud 701, the dust cap 70 does not need to be connected by setting an internal thread on the inner wall to cooperate with the external thread set on the outer peripheral side of the sealing end cover 60 or the valve body 10, but can be directly covered on the outside of the sealing end cover 60 and the valve body 10. Compared with the dust cap 70 with threads set in the related art, the size of the dust cap 70 in the present application can be set smaller and occupy less space.

[0060] Furthermore, the screw hole 601 is formed on the axis of the sealing end cap 60, and a boss 311 is provided on the end surface of the valve core 30 facing away from the valve port 213, and the boss 311 abuts against the hole wall of the screw hole 601. In this way, the boss 311 and the sealing end cap 60 are sealed, which further enhances the sealing performance of the stop valve 100. When the boss 311 abuts against the hole wall of the screw hole 601 circumferentially, the abutting surface is approximately in the shape of a circular ring. Therefore, compared with the existing solution of achieving sealing by the outer peripheral edge of the end surface of the valve core 30 and the sealing end cap 60, the present application adopts the method of coaxially arranging the boss 311 with the screw hole 601 and abutting against the hole wall of the screw hole 601. The circumference of the abutting surface is shorter, the contact area is smaller, and the friction force, that is, the torque, that needs to be overcome when twisting the valve core 30 is smaller, which is more convenient for operation.

[0061] A second annular groove 202 is provided on the outer peripheral side of the end of the valve seat 20 facing away from the valve core 30, and a stopper 28 is pressed into the notch of the second annular groove 202. The groove wall of the second annular groove 202, the valve body 10 and the stopper 28 form a cavity, and a fifth solder 505 is provided in the cavity. Therefore, when the fifth solder 505 is melted by high-temperature heating, the valve seat 20, the valve body 10 and the stopper 28 can be welded together, the structure is firm, and the welding steps are simple.

[0062] Before the stop valve 100 is assembled by welding, it further includes a second solder 502 . The second solder 502 is disposed on the side of the stopper 28 facing away from the second annular groove 202 , and at least a portion of the second solder 502 contacts the valve seat 20 , thereby welding the stopper 28 and the valve seat 20 together.

[0063] In this embodiment, the second solder 502 is disposed on the outer peripheral side of the first connecting pipe 12 and contacts the first connecting pipe 12 . During the welding process, the first connecting pipe 12 , the valve seat 20 and the stopper 28 can also be welded together.

[0064] Referring to Figures 3-9 , in another embodiment, the valve chamber 21 includes a mounting chamber 211, a threaded chamber 212, and a valve port 213, which are interconnected. The threaded chamber 212 is located between the mounting chamber 211 and the valve port 213. A valve core 30 is movably mounted within the valve chamber 21. A threaded section 301 of the valve core 30 is threadedly connected to the wall of the threaded chamber 212. A stop section 302 of the valve core 30 is located within the mounting chamber 211 and is slidably connected to the wall of the mounting chamber 211. As the valve core 30 moves within the valve chamber 21, the valve core 30 can open and close the valve port 213.

[0065] It can be understood that in this embodiment, both ends of the valve seat 20 along the moving direction of the valve core 30 are in circumferential contact with the inner wall of the valve body 10 .

[0066] In this way, the valve port 213 is connected to the channel in the valve body 10, and the medium can flow in the stop valve through the valve port 213. Therefore, the stop valve can be closed by moving the valve core 30 and closing the valve port 213, and the stop valve can be opened by moving away from the valve port 213 to open the valve port 213. The valve core 30 is slidably connected to the installation cavity 211 and cooperates with the threaded cavity. That is, during the movement of the valve core 30, the installation cavity 211 and the threaded cavity 212 guide the valve core 30 throughout the entire process. In this way, the guidance and thread positioning of the valve core 30 are all achieved by the valve seat 20, and the problem of inconsistent concentricity between the valve body 10 and the valve seat 20 affecting the guidance will not occur. The installation cavity 211, the threaded cavity 212, and the valve port 213 maintain good concentricity and coaxiality. The valve core 30 can completely press against and close the valve port 213 during movement, tightly sealing the valve port 213, with reliable sealing performance and no leakage.

[0067] And during the movement of the valve core 30 toward the valve port 213, the threaded cavity 212 always cooperates with the thread of the valve core 30 and guides the direction of its movement to prevent it from deflecting during the movement, so that the end face of the valve core 30 close to the valve port 213 is stably in contact with the valve port 213, thereby improving the concentricity of the valve core 30 and the valve port 213, further improving the sealing performance, and avoiding problems such as medium leakage.

[0068] Furthermore, under this structure, the valve body 10 no longer needs to guide the valve core 30, so there are no longer high requirements for the roughness, concentricity, coaxiality, and roundness of the interior of the valve body 10. Even if there are welds on the valve body 10, it can meet the use requirements, and there is no need to limit it to being weld-free, which reduces material costs.

[0069] In one embodiment, the mounting cavity 211, the threaded cavity 212, and the valve port 213 are arranged along the height of the valve seat 20, and are coaxial and concentric. That is, along the height of the valve seat 20, the mounting cavity 211, the threaded cavity 212, and the valve port 213 are sequentially arranged from top to bottom along the axis of the valve cavity 21. Consequently, when the valve core 30 moves within the valve seat 20, it always moves along the axis of the valve seat 20, preventing positional deviation during movement. The concentricity of the valve core 30 and the valve port 213 is completely consistent, ensuring a good sealing effect and preventing leakage.

[0070] 9 , the valve seat 20 is formed by one-piece processing. One-piece processing can be performed by die-casting, turning, milling, etc. This embodiment adopts turning, which is simple to operate and low in cost.

[0071] Specifically, the installation cavity 211, the threaded cavity 212, and the valve port 213 are formed by one-time machining on the cavity wall of the valve cavity 21. One-time machining can be performed by turning, milling, etc. This embodiment adopts turning, which is simple to operate and low in cost.

[0072] For example, along the axis of the valve cavity 21, the valve core 30 has a top 31 and a bottom 32 disposed opposite each other. When the valve core 30 moves toward the valve port 213, the bottom 32 seals against the valve port 213 to close the valve port 213. When the valve core 30 moves away from the valve port 213, the bottom 32 releases the seal from the valve port 213 to open the valve port 213. The seal here refers to abutment, but other methods such as plug-in connection are also possible.

[0073] In this embodiment, the external thread is provided in the middle of the valve core 30. Of course, the external thread can also be provided near the bottom 32 of the valve core 30. In one embodiment, in the height direction of the valve seat 20, the threaded cavity 212 extends from the valve port 213 to the mounting cavity 211. In this way, during the movement of the valve core 30, the external thread is always threadedly engaged with the threaded cavity 212. In other words, the threaded cavity 212 always guides and limits the movement of the valve core 30 within the valve seat 20. This further ensures the stability of the movement of the valve core 30, improves the concentricity of the valve core 30 and the valve port 213, and ensures that the valve core 30 and the valve port 213 are tightly connected.

[0074] In one embodiment, a tapered surface 321 is provided on the circumferential edge of the bottom portion 32, which abuts against the valve opening 213 to achieve a sealed fit. Because the tapered surface 321 is disposed at an angle, the abutment between the bottom portion 32 and the valve opening 213 is more tightly secured, achieving a good sealing effect and preventing gaps from forming even when a hard seal is employed.

[0075] Furthermore, the inner wall of the valve seat 20, which forms the valve opening 213, is provided with a radially inwardly projecting step 24. The tapered surface 321 abuts against the step 24 to achieve a seal. Because the step 24 is projecting inward, its diameter is smaller than the diameter of the valve opening 213. Consequently, when the bottom 32 abuts the valve opening 213, it abuts both the valve opening 213 and the step 24, creating two sealing abutment locations. This creates a double seal and provides a strong sealing effect. If one seal fails, the other can still provide a seal, extending the service life.

[0076] Furthermore, the limiting section 302 is provided near the top 31 of the valve core 30. A sealing ring is provided on the limiting section 302. The outer wall of the sealing ring abuts against the wall of the mounting cavity 211 and can slide relative to the inner wall of the mounting cavity 211. That is, the limiting section 302 and the wall of the mounting cavity 211 are slidably connected. Of course, other methods can also be used, such as directly providing the outer surface of the limiting section 302 or the wall of the mounting cavity 211 with a smooth surface, or providing lubricating oil between the two. During the movement of the valve core 30, the wall and the mounting cavity 211 are always in abutment and cooperation, thereby guiding the valve core 30 through the mounting cavity 211.

[0077] Specifically, a mounting hole 101 is provided on the valve body 10, and one end of the valve seat 20 extends into the valve body 10 through the mounting hole 101, and the other end is located outside the valve body 10. In one embodiment, an extension portion 102 is provided on the valve body, and along the axial direction of the valve body 10, the mounting hole 101 extends in a direction away from the mounting hole 101 to form the extension portion 102, and the extension portion 102 is sleeved on the outside of the valve seat 20, and the valve seat 20 is fixedly connected to the extension portion 102. The connection method between the valve seat 20 and the extension portion 102 can be laser welding, solder welding, etc. The present application prefers solder welding, and a first solder 501 is provided on the extension portion 102, and a portion of the first solder 501 is in contact with the valve seat 20, so that the extension portion and the valve seat can be fixedly connected together by solder during welding.

[0078] Exemplarily, the first solder 501 is disposed at an end portion of the extension portion 102 relatively away from the mounting hole 101 .

[0079] Specifically, the stop valve 100 includes a valve body 10, a first connecting pipe 12, and a stopper 28. The valve body 10 is sleeved onto the valve seat 20. The mounting hole 101 and the extension 102 are both provided on the valve body 10. The outer wall of the valve seat 20 is welded to the inner wall of the valve body 10. A first solder 501 is provided at the connection between the valve seat 20 and the end of the extension 102. A connecting port 26 is defined on the side of the valve seat 20 near the valve opening 213. The first connecting pipe 12 is inserted into this connecting port 26. A first annular groove 201 is defined on the outer peripheral wall of the valve seat 20 near the connecting port 26. The stopper 28 is sleeved onto the first annular groove 201. In one embodiment, the stop valve further includes a second solder 502, which is disposed on the first connecting pipe 12. Portions of the second solder 502 contact the valve seat 20 and the stopper 28, thereby achieving a connection between the valve seat 20, the stopper 28, and the first connecting pipe 12. In this embodiment, the lower end surface of the valve seat 20 is flush with the lower end surface of the stopper 28, and the second solder 502 is positioned where these two end surfaces are flush.

[0080] Furthermore, a second annular groove 202 is defined on the outer peripheral wall of the valve seat 20 at one end near the stopper 28. A fifth solder 505 is disposed within the second annular groove 202, with portions of the fifth solder 505 contacting the valve body 10 and the stopper 28. The fifth solder 505 connects the valve body 10, the stopper 28, and the valve seat 20. In this embodiment, the lower end surface of the valve body 10 abuts the upper end surface of the stopper 28. In other words, the groove wall of the second annular groove 202, the inner wall of the valve body 10, and the upper end surface of the stopper 28 enclose a cavity, and the fifth solder 505 is disposed within this cavity.

[0081] In one embodiment, the stop valve 100 further includes a second connecting pipe 13 connected to the valve body 10. A communication port 16 is defined in the valve body 10. The communication port 16 extends away from the communication port 16 to form a flange 161. The second connecting pipe 13 is inserted into and fixedly connected to the flange 161. Specifically, a third solder 503 is provided on the flange 161, and a portion of the third solder 503 contacts the second connecting pipe 13. The third solder 503 secures the second connecting pipe 13 to the flange 161.

[0082] Specifically, the first connecting pipe 12 is arranged along a first direction, and the second connecting pipe 13 is arranged along a second direction. A channel for medium flow is constructed within the valve body 10. The channel includes a first channel 14 formed within the first connecting pipe 12 and a second channel 15 formed within the second connecting pipe 13. A second opening 25 is provided on the valve seat 20 at a position corresponding to the second connecting pipe 13. This second opening 25 is connected to the valve cavity 21. Therefore, the valve cavity 21 is connected to the second channel 15 through the second opening 25. In other words, the first channel 14 is connected to the second channel 15 through the valve port 213 and the valve cavity 21. The medium can flow through the first channel 14 within the first connecting pipe 12 into the valve port 213, pass through the valve cavity 21, and then flow into the second channel 15. Furthermore, closing the valve port 213 by the valve core 30 can close the connection between the first channel 14 and the second channel 15, thereby blocking the flow of the medium. It should be noted that, referring to Figures 5 and 6 , in this embodiment, the first direction is the direction of movement of the valve core 30, which is also the axial direction of the valve body 10. The second direction is the axial direction of the second connecting pipe 13 after the valve body 10 is connected to the second connecting pipe 13. In this embodiment, the first and second directions are arranged at a right angle. In other embodiments, the first and second directions may also be at an acute or obtuse angle.

[0083] In one embodiment, the stop valve 100 further includes a sealing end cover 60, which is provided on one end of the valve seat 20 close to the mounting cavity 211, and the outer wall of the sealing end cover 60 is at least partially sealed with the inner wall of the mounting cavity 211. In this way, the sealing end cover 60 can seal the valve body 10 to prevent leakage of the medium in the valve body 10. At the same time, the sealing end cover 60 also plays a certain limiting role on the valve core 30, controlling the upward movement of the valve core 30. In this embodiment, the sealing end cover 60 is made of a flexible material such as rubber or resin, and the sealing end cover 60 can be partially inserted into the mounting cavity 211, thereby achieving a sealing fit with the inner wall of the mounting cavity 211. Of course, in this embodiment, the sealing end cover 60 can also be fully inserted into the mounting cavity 211, and the two can also be sealed by other means such as bonding.

[0084] In one embodiment, the stop valve further includes a dust cap 70 to prevent dust from entering the valve body. Specifically, the dust cap 70 is provided with a stud 701, and the sealing end cap 60 is provided with a screw hole 601, with the stud 701 being threadedly connected to the screw hole 601. Thus, the dust cap 70 is directly screwed onto the sealing end cap, eliminating the need for external threads on the valve body 10 to engage with the dust cap 70. The dust cap 70 is simply sleeved onto the outside of the valve body 10, and the portion of the dust cap 70 that is sleeved onto the outside of the valve body 10 does not need to be internally threaded. This allows the dust cap 70 to be smaller in size, minimizing its space requirements.

[0085] In one embodiment, the stop valve further includes a valve 40 connected to the other side of the valve body 10 corresponding to the second connecting pipe 13. An opening 29 is provided on the valve seat 20 at a position corresponding to the valve 40. The opening 29 enables communication between the valve chamber 21 and the valve 40. The structure of the valve 40 is known from related art and can be purchased directly, so a detailed description thereof is omitted here.

[0086] In one embodiment, a fourth solder 504 is also provided at the connection between the valve body 10 and the valve stem 40 .

[0087] The initial states of the first solder 501 , the second solder 502 , the third solder 503 and the fourth solder 504 are all solder rings, which facilitates the welding process.

[0088] Compared with the related art, the present application guides the movement direction of the valve core 30 by setting a threaded portion 222 on the valve seat 20, and opens a thread on the outer peripheral side of the valve core 30. The valve core 30 can be threadedly engaged with the threaded portion 222, thereby moving along the extension direction of the threaded portion 222. The threaded portion 222 extends from the valve port 213 toward the valve core 30. That is, for the valve core 30, the threaded portion 222 extends from the end face thereof extending into the valve seat 20 all the way to the valve port 213. Therefore, in the process of the valve core 30 moving toward the valve port 213, the threaded portion 222 always threadably engages with the valve core 30 and guides its movement direction, preventing it from being offset during the movement, so that the end face of the valve core 30 close to the valve port 213 is stably abutted against the valve port 213, thereby improving the concentricity of the valve core 30 and the valve port 213, thereby improving the sealing performance and avoiding problems such as medium leakage.

[0089] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0090] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A stop valve, characterized in that: The stop valve comprises: A valve body, wherein a channel for medium flow is configured in the valve body; a valve seat, the valve seat being mounted in the valve body and connected to the inner wall of the valve body forming the passage, the valve seat being provided with a valve cavity having a valve port communicating with the passage; and a valve core, the valve core being installed in the valve body, with at least a portion of the valve core being located in the valve seat and being movable in the valve cavity; A threaded portion is provided in the valve seat, a thread matching the threaded portion is provided on the outer peripheral side of the valve core, the threaded portion extends from the valve port toward the valve core, and the portion of the valve core located in the valve seat is threadedly matched with the threaded portion.

2. The stop valve according to claim 1, wherein The valve core includes a threaded section and a limiting section connected to each other; the threaded section extends into the valve cavity and is connected to the threaded portion of the valve seat, and the outer peripheral side of the limiting section is circumferentially abutted against the inner wall of the valve body or the inner wall of the valve seat.

3. The stop valve according to claim 2, wherein: The valve cavity includes an installation cavity, a threaded cavity and the valve port which are interconnected. The inner wall of the threaded part forms the threaded cavity, and the threaded cavity is located between the installation cavity and the valve port. The installation cavity, the threaded cavity and the valve port are coaxially and concentrically arranged. The threaded section is threadedly matched with the cavity wall of the threaded cavity. The limiting section is located in the installation cavity and is slidably connected to the cavity wall of the installation cavity.

4. The stop valve according to claim 3, wherein: The valve body is provided with a mounting hole, one end of the valve seat extends into the valve body through the mounting hole, and the other end is located outside the valve body.

5. The stop valve according to claim 4, wherein: Along the axial direction of the valve body, the mounting hole extends away from the mounting hole to form an extension portion, and the valve seat is fixedly connected to the extension portion; a first solder is provided on the extension portion, and a portion of the first solder is in contact with the valve seat.

6. The stop valve according to claim 2, wherein: The valve cavity includes a threaded cavity and the valve port that are interconnected. The threaded cavity and the valve port are concentrically and coaxially arranged. The inner wall of the threaded portion forms the threaded cavity. Along the moving direction of the valve core, the valve body is provided with a matching cavity. In which, the threaded section is threadedly matched with the cavity wall of the threaded cavity, the limiting section is located in the matching cavity, and is slidingly connected with the cavity wall of the matching cavity; the diameter of the limiting section is larger than the threaded section; a sealing groove is provided on the outer peripheral side of the limiting section, a sealing ring is embedded in the sealing groove, and the outer peripheral side of the sealing ring abuts against the inner wall of the valve body or the inner wall of the valve seat.

7. The stop valve according to claim 6, wherein: A conical surface is provided on the circumferential edge of one end of the threaded section close to the valve port, and the conical surface abuts against the valve port.

8. The stop valve according to claim 6, wherein: The inner wall of the valve seat forming the valve port is provided with a step protruding radially inward, and the valve core abuts against the step.

9. The stop valve according to claim 1, wherein: The stop valve further includes a sealing end cover, which is provided at one end of the valve body away from the valve port, and at least a portion of the outer wall of the sealing end cover is sealed with the inner wall of the valve body or the inner wall of the valve cavity.

10. The stop valve according to claim 9, wherein The stop valve also includes a dust cap, a stud is provided on the dust cap, a screw hole is provided on the sealing end cover, the stud is inserted into the screw hole and is threadedly connected; and / or, the screw hole is opened on the axis of the sealing end cover, and a boss is provided on the end surface of the valve core facing away from the valve port, the boss is coaxially arranged with the screw hole, and the boss abuts against the hole wall of the screw hole.

11. The stop valve according to claim 1, wherein The valve seat further defines a first opening along a first direction, the first opening being in communication with the valve port, a portion between the first opening and the valve port forming the valve cavity for movement of the valve core, and the valve core being installed in the valve cavity through the first opening; The valve seat is provided with a flow cavity along the second direction, the flow cavity passes through both ends of the valve seat in the second direction and is in communication with the valve cavity; The first direction and the second direction are arranged at an angle, and the first direction is the same as the direction in which the valve core moves.

12. The stop valve according to claim 11, wherein The valve body is provided with a communication port along the second direction, and the edge of the communication port has a flange bent along the first direction. The stop valve also includes a second connecting pipe, which is connected to the inner wall of the communication port formed by the flange and is connected to the channel.

13. The stop valve according to claim 12, wherein: One end of the second connecting pipe close to the valve body extends toward the valve body and abuts against the outer peripheral side of the valve seat; and / or, the stop valve also includes a third solder, which is arranged on the flange and contacts the second connecting pipe for welding the flange and the second connecting pipe.

14. The stop valve according to claim 1, wherein A second annular groove is formed on the outer circumference of one end of the valve seat facing away from the valve core, a stopper is pressed into the notch of the second annular groove, the groove wall of the second annular groove, the valve body, and the stopper form a cavity, and a fifth solder is provided in the cavity; the stopper and the valve body are connected by welding; The stop valve also includes a first connecting pipe, a connecting port is provided on a side of the valve seat close to the valve port, and the first connecting pipe is inserted into the valve seat through the connecting port; a first annular groove is also provided on the outer peripheral wall of the valve seat close to one end of the connecting port, and the stop block is sleeved on the first annular groove; the stop valve also includes a second solder, which is provided on the first connecting pipe, and part of the second solder is in contact with the valve seat and the stop block.

15. The stop valve according to claim 1, characterized in that Both ends of the valve seat along the moving direction of the valve core are in circumferential contact with the inner wall of the valve body; or, one end of the valve seat close to the valve port is in circumferential contact with the inner wall of the valve body.

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