Stop valve

Abstract

The utility model relates to the field of refrigeration, in particular to a stop valve. The stop valve comprises a valve body; the valve seat is mounted in the valve body, and a valve cavity is formed in the valve seat; the valve element is movably mounted in the valve cavity, and the valve element comprises a threaded section and a matching section; wherein the valve cavity comprises a mounting cavity, a threaded cavity and a valve port which are communicated with one another, and the threaded cavity is located between the mounting cavity and the valve port; the mounting cavity, the threaded cavity and the valve port are coaxially and concentrically arranged, the threaded section is in threaded connection with the cavity wall of the threaded cavity, the matching section is located in the mounting cavity and is in sliding connection with the cavity wall of the mounting cavity, and the valve element can open and close the valve port along with movement of the valve element in the valve cavity. The sealing performance is improved, and the problems of medium leakage and the like are avoided.

Description

Technical Field

[0001] The utility model relates to the field of refrigeration, in particular to a stop valve. Background Art

[0002] The stop valve is widely used in the pipelines of the refrigeration system to open and close the medium flowing in the pipeline. In order to solve the problem of the gap between the valve core and the valve port, the existing stop valve is provided with a valve seat with internal threads in the valve body near the valve port. The upper part of the valve core is guided by the valve body, and the lower part of the valve core moves up and down in coordination with the valve seat thread. The valve body and the valve seat jointly guide the valve core to ensure that the valve core and the valve port are tightly sealed to avoid leakage. However, due to the structural characteristics of the stainless steel stop valve, the above-mentioned valve body and valve seat need to be assembled by press fitting. However, due to the difference in the size of the accessories and the influence of press fitting, tolerances will be generated during the press fitting process, so that the assembled valve body and valve seat cannot meet the requirements of concentricity and coaxiality, affecting the movement stroke of the valve core, resulting in the unsmooth operation of the valve core and the problem of loose sealing between the valve core and the valve port. Utility Model Content

[0003] Based on this, the utility model aims at the above technical problems and provides a stop valve that solves the problem of poor sealing.

[0004] A stop valve, comprising:

[0005] Valve body;

[0006] A valve seat, wherein the valve seat is installed in the valve body and a valve cavity is provided in the valve seat;

[0007] A valve core, the valve core is movably installed in the valve cavity, and the valve core includes a threaded section and a fitting section;

[0008] In which, the valve cavity includes an installation cavity, a threaded cavity and a valve port which are interconnected, 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 connected to the cavity wall of the threaded cavity, the mating section is located in the installation cavity and is slidably connected to the cavity wall of the installation cavity, and as the valve core moves in the valve cavity, the valve core can open and close the valve port.

[0009] 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 of the valve seat is located outside the valve body.

[0010] In one embodiment, the mounting hole extends in a direction away from the mounting hole to form an extension portion, and the valve seat is fixedly connected to the extension portion.

[0011] In one embodiment, 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 stop valve further includes a sealing portion, which is disposed on an end of the valve seat close to the installation cavity, and an outer wall of the sealing portion is at least partially sealed with an inner wall of the installation cavity.

[0013] In one embodiment, the stop valve further comprises a cap, the cap is provided with a stud, the sealing portion is provided with a screw hole, and the stud is threadedly connected to the screw hole.

[0014] In one embodiment, the valve body includes a main body, a first connecting pipe, and a stopper. 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 connecting port. A first annular groove is provided on the outer peripheral wall of one end of the valve seat close to the connecting port, and the stopper is sleeved on the first annular groove.

[0015] In one embodiment, the stop valve further includes a second solder, wherein the second solder is disposed on the first connecting pipe, and a portion of the second solder is in contact with the valve seat and the stopper.

[0016] In one embodiment, a second annular groove is formed on an outer peripheral wall of one end of the valve seat close to the stopper, and solder is provided in the second annular groove, and a portion of the solder is in contact with the body and the stopper.

[0017] In one embodiment, the valve body also includes a second connecting pipe, and a connecting port is opened on the main body; the connecting port extends in a direction away from the connecting port to form a flange, and the second connecting pipe is inserted into the flange and fixedly connected to the flange; a third solder is provided on the flange, and a portion of the third solder is in contact with the second connecting pipe.

[0018] Compared with the prior art, the mounting cavity, threaded cavity and valve port in the present application are all on the valve seat, that is, the guidance and threaded positioning of the valve core are achieved by the valve seat, and the concentricity and coaxiality of the two are good, ensuring that the valve core can completely press against the valve port during movement, tightly sealing the valve port, with reliable sealing performance and no leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the stop valve provided by the utility model;

[0020] Figure 2 A side view of the stop valve provided by the utility model;

[0021] Figure 3 for Figure 2 Sectional view along line AA;

[0022] Figure 4 for Figure 2 A three-dimensional cross-sectional view along line AA;

[0023] Figure 5 for Figure 4 Schematic diagram of the matching between the valve seat and the valve core;

[0024] Figure 6 A schematic diagram of the structure of the valve seat provided by the utility model;

[0025] Figure 7 This is a three-dimensional cross-sectional view of the valve seat provided by the utility model.

[0026] The symbols in the figure mean the following:

[0027] 10. Valve body; 101. Mounting hole; 102. Extension; 11. Body; 12. First connecting pipe; 13. Second connecting pipe; 14. First passage; 15. Second passage; 16. Communication port; 161. Flanging; 20. Valve seat; 201. First annular groove; 202. Second annular groove; 21. Valve cavity; 211. Mounting cavity; 212. Threaded cavity; 213. Valve port; 24. Step; 25. Opening ; 26, connecting port; 28, stopper; 29, opening; 30, valve core; 301, threaded section; 302, fitting section; 31, top; 32, bottom; 321, conical surface; 40, valve nozzle; 501, first solder; 502, second solder; 503, third solder; 504, fourth solder; 505, solder; 60, sealing part; 601, screw hole; 70, cap; 701, stud. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] 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.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may 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 intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those 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 related listed items.

[0033] See also Figure 1-Figure 7 The stop valve of the present application includes a valve body 10, a valve seat 20, and a valve core 30. The valve seat 20 is installed in the valve body 10, and a valve cavity 21 is provided in the valve seat 20. The valve cavity 21 includes an installation cavity 211, a threaded cavity 212, and a valve port 213 that are interconnected, and the threaded cavity 212 is located between the installation cavity 211 and the valve port 213. The valve core 30 includes a threaded section 301 and a matching section 302, and the valve core 30 is movably installed in the valve cavity 21. The threaded section 301 is threadedly connected to the cavity wall of the threaded cavity 212, and the matching section 302 is located in the installation cavity 211 and is slidably connected to the cavity wall of the installation cavity 211, and as the valve core 30 moves in the valve cavity 21, the valve core 30 can open and close the valve port 213.

[0034] 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 valve core 30 moves and closes the valve port 213 to close the stop valve, and moves away from the valve port 213 to open the valve port 213 to open the stop valve. The valve core 30 is slidably connected to the installation cavity 211 and cooperates with the threaded cavity. That is to say, during the movement of the valve core 30, the installation cavity 211 and the threaded cavity 212 guide the valve core 30 throughout the whole process. In this way, the guidance and thread positioning of the valve core 30 are all achieved by the valve seat 20, and there will be no problem of inconsistent concentricity between the valve body 10 and the valve seat 20 affecting the guidance. 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 and close the valve port 213 during the movement, and the valve port 213 is tightly blocked, and the sealing performance is reliable without leakage.

[0035] Furthermore, 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 deviating 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.

[0036] 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 inside 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, thereby reducing material costs.

[0037] In one embodiment, the installation cavity 211, the threaded cavity 212, and the valve port 213 are arranged along the height direction of the valve seat 20, and the installation cavity 211, the threaded cavity 212, and the valve port 213 are coaxial and concentric. That is, in the height direction of the valve seat 20, the installation cavity 211, the threaded cavity 212, and the valve port 213 are sequentially distributed from top to bottom along the axis of the valve cavity 21, and when the valve core 30 moves in the valve seat 20, it always moves in the axial direction of the valve seat 20, and there will be no position deviation during the movement. The concentricity of the valve core 30 and the valve port 213 is completely consistent, ensuring a good sealing effect and no leakage.

[0038] See also Figure 7 The valve seat 20 is formed by one-piece processing, and the 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.

[0039] Specifically, the installation cavity 211, the threaded cavity 212, and the valve port 213 are formed by one-time machining on the cavity wall in the valve cavity 21. One-time machining can be performed by turning, milling, etc. This embodiment uses turning, which is simple to operate and low in cost.

[0040] For example, along the axial direction of the valve cavity 21, the valve core 30 has a top 31 and a bottom 32 that are arranged opposite to each other. When the valve core 30 moves toward the valve port 213, the bottom 32 seals and cooperates with 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 and cooperates with the valve port 213 to open the valve port 213. The seal cooperation here refers to abutment, and of course it can also be other ways such as plug-in.

[0041] In this embodiment, the external thread is provided at the middle position of the valve core 30. Of course, the external thread can also be provided at the position of the valve core 30 near the bottom 32. Preferably, in the height direction of the valve seat 20, the threaded cavity 212 extends from the position of the valve port 213 to the installation cavity 211, so that during the movement of the valve core 30, the external thread is always threadedly connected with the threaded cavity 212, that is, the threaded cavity 212 always guides and limits the entire movement of the valve core 30 in the valve seat 20, 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 contact between the valve core 30 and the valve port 213.

[0042] Preferably, the circumferential edge of the bottom 32 is provided with a conical surface 321, and the conical surface 321 abuts against the valve port 213 to achieve a sealed fit. Since the conical surface 321 is arranged obliquely, the abutment between the bottom 32 and the valve port 213 is tighter, and even if a hard seal is used, a good sealing effect can be achieved without the occurrence of gaps.

[0043] Furthermore, the inner wall of the valve seat 20 forming the valve port 213 is radially inwardly protruded with a step 24, and the conical surface 321 abuts against the step 24 to achieve a sealing fit. Since the step 24 is protruded inwardly, its diameter is smaller than the diameter of the valve port 213, and then when the bottom 32 abuts against the valve port 213, it will abut against the valve port 213 and the step 24 respectively, resulting in two sealing abutment positions, double sealing, and good sealing effect; if one of the seals is invalid, the other can still achieve sealing, thereby extending the service life.

[0044] Furthermore, the matching section 302 is arranged at a position of the valve core 30 close to the top 31, and a sealing ring is arranged on the matching section 302, the outer wall of which abuts against the cavity wall of the installation cavity 211, and can slide relative to the inner wall of the installation cavity 211, that is, the matching section 302 and the cavity wall of the installation cavity 211 are slidably connected. Of course, other methods can also be used, such as directly setting the outer surface of the matching section 302 or the cavity wall of the installation cavity 211 as a smooth surface, or setting lubricating oil between the two. During the movement of the valve core 30, the cavity wall and the installation cavity 211 are always in abutment and matching, and then the valve core 30 is guided by the installation cavity 211.

[0045] Specifically, a mounting hole 101 is provided on the valve body 10, 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 outside 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 the solder during welding. Specifically, the valve body 10 includes a main body 11, a first connecting pipe 12, and a stopper 28. The body 11 is sleeved outside the valve seat 20, the mounting hole 101 and the extension 102 are both provided on the body 11, the outer wall of the valve seat 20 is welded and fixedly connected with the inner wall of the body 11, and the first solder 501 is provided at the connection position between the valve seat 20 and the end of the extension 102. A connection port 26 is provided on the side of the valve seat 20 close to the valve port 213, and the first connecting pipe 12 is inserted into the connection port 26. A first annular groove 201 is provided on the outer peripheral wall of the valve seat 20 close to the connection port 26, and the stopper 28 is sleeved on the first annular groove 201. Preferably, the stop valve further includes a second solder 502, which is provided on the first connecting pipe 12, and part of the second solder 502 is in contact with the valve seat 20 and the stopper 28, and the connection between the valve seat 20, the stopper 28 and the first connecting pipe 12 is realized through the second solder 502. 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 placement position of the second solder 502 is the position where the end surfaces of the two are flush.

[0046] Furthermore, a second annular groove 202 is formed on the outer peripheral wall of the valve seat 20 at one end close to the stopper 28, and a solder 505 is provided in the second annular groove 202, and a portion of the solder 505 is in contact with the body 11 and the stopper 28. The body 11, the stopper 28 and the valve seat 20 are connected by the solder 505. In this embodiment, the lower end surface of the body 11 abuts against the upper end surface of the stopper 28, that is, the groove wall of the second annular groove 202, the inner wall of the body 11 and the upper end surface of the stopper 28 can be surrounded to form a cavity, and the solder 505 is arranged in this cavity.

[0047] In one embodiment, the valve body 10 further includes a second connecting pipe 13, which is connected to the body 11, and a connecting port 16 is provided on the body 11. The connecting port 16 extends in a direction away from the connecting port 16 to form a flange 161, and the second connecting pipe 13 is inserted into the flange 161 and is 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 is in contact with the second connecting pipe 13, and the second connecting pipe 13 and the flange 161 are fixedly connected through the third solder 503.

[0048] Specifically, the first connecting pipe 12 is arranged along the first direction, and the second connecting pipe 13 is arranged along the second direction. A channel for medium flow is constructed in the valve body 10, and the channel includes a first channel 14 formed in the first connecting pipe 12 and a second channel 15 formed in the second connecting pipe 13. An opening 25 is provided on the valve seat 20 at a position corresponding to the second connecting pipe 13, and the opening 25 is connected to the valve cavity 21, so the valve cavity 21 is connected to the second channel 15 through the opening 25, that is, the first channel 14 is connected to the second channel 15 through the valve port 213 and the valve cavity 21, and the medium can flow into the valve port 213 through the first channel 14 in the first connecting pipe 12, and after passing through the valve cavity 21, flow into the second channel 15. Furthermore, the valve core 30 can close the valve port 213 to close the connection between the first channel 14 and the second channel 15, that is, block the flow of the medium. It should be explained that, refer to Figure 3 , Figure 4 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 second connecting pipe 13 after the valve body 10 is connected to the second connecting pipe 13. 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 may also be an acute angle or an obtuse angle.

[0049] In one embodiment, the stop valve further includes a sealing portion 60, which is disposed on one end of the valve seat 20 close to the mounting cavity 211, and the outer wall of the sealing portion 60 is at least partially sealed with the inner wall of the mounting cavity 211. In this way, the sealing portion 60 can seal the valve body 10 to prevent leakage of the medium in the valve body 10. At the same time, the sealing portion 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 portion 60 is made of a flexible material such as rubber and resin, and the sealing portion 60 can be partially inserted into the mounting cavity 211, thereby achieving a sealing match with the inner wall of the mounting cavity 211. Of course, in this embodiment, the sealing portion 60 can also be fully inserted into the mounting cavity 211, and the two can also be sealed by other methods such as bonding.

[0050] Preferably, the stop valve further includes a cap 70 to prevent dust from entering the valve body. Specifically, a stud 701 is provided on the cap 70, and a screw hole 601 is provided on the sealing portion 60, and the stud 701 is threadedly connected to the screw hole 601. Thus, the cap 70 is directly screwed on the sealing portion, and then the valve body 10 does not need to be provided with an external thread to be screwed with the cap 70. The cap 70 is only sleeved on the outside of the valve body 10, and the part of the cap 70 sleeved on the outside of the valve body 10 does not need to be provided with an internal thread, so that the size of the cap 70 can be set smaller and the space occupied is small.

[0051] In one embodiment, the stop valve further includes a valve 40, which is connected to the other side of the body 11 corresponding to the second connecting pipe 13, and an opening 29 is provided on the valve seat 20 corresponding to the position of the valve 40, so that the valve cavity 21 and the valve 40 are connected through the opening 29. The structure of the valve 40 is prior art and can be directly purchased, so it is not described here.

[0052] Preferably, a fourth solder 504 is also provided at the connection between the body 11 and the valve 40 .

[0053] 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 welding processing.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0055] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A stop valve, characterized in that: The stop valve comprises: Valve body (10); A valve seat (20), the valve seat (20) being installed in the valve body (10), and a valve cavity (21) being provided in the valve seat (20); A valve core (30), the valve core (30) being movably mounted in the valve cavity (21), and the valve core (30) comprising a threaded section (301) and a mating section (302); The valve cavity (21) comprises a mounting cavity (211), a threaded cavity (212) and a valve port (213) which are interconnected; the threaded cavity (212) is located between the mounting cavity (211) and the valve port (213); the mounting cavity (211), the threaded cavity (212) and the valve port (213) are coaxially and concentrically arranged; the threaded segment (301) is threadedly matched with a cavity wall of the threaded cavity (212); the matching segment (302) is located in the mounting cavity (211) and is connected to the valve port (213). ) and is slidably connected with the cavity wall of the mounting cavity (211); a mounting hole (101) is provided on the valve body (10); one end of the valve seat (20) extends into the valve body (10) through the mounting hole (101); the other end is located outside the valve body (10); along the axial direction of the valve body (10), the mounting hole (101) extends away from the mounting hole (101) to form an extension portion (102); the valve seat (20) is fixedly connected to the extension portion (102).

2. The stop valve according to claim 1, characterized in that: 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).

3. The stop valve according to claim 1, characterized in that: The stop valve further comprises a sealing portion (60), wherein the sealing portion (60) is arranged on one end of the valve seat (20) close to the installation cavity (211), and an outer wall of the sealing portion (60) at least partially cooperates with an inner wall of the installation cavity (211) in a sealing manner.

4. The stop valve according to claim 3, characterized in that: The stop valve further comprises a cap (70), the cap (70) being provided with a stud (701), the sealing portion (60) being provided with a screw hole (601), the stud (701) being inserted into the screw hole (601) and being threadedly connected.

5. The stop valve according to claim 1, characterized in that: The valve body (10) comprises a main body (11), a first connecting pipe (12), and a stopper (28); a connecting port (26) is provided on a side of the valve seat (20) close to the valve port (213), and the first connecting pipe (12) is inserted into the connecting port (26); a first annular groove (201) is provided on an outer peripheral wall of one end of the valve seat (20) close to the connecting port (26), and the stopper (28) is sleeved on the first annular groove (201).

6. The stop valve according to claim 5, characterized in that: The stop valve further comprises a second solder (502), wherein the second solder (502) is arranged on the first connecting pipe (12), and a portion of the second solder (502) is in contact with the valve seat (20) and the stopper (28).

7. The stop valve according to claim 5, characterized in that: A second annular groove (202) is provided on the outer peripheral wall of one end of the valve seat (20) close to the stopper (28), and solder (505) is provided in the second annular groove (202), and a portion of the solder (505) is in contact with the valve body (10) and the stopper (28).

8. The stop valve according to claim 5, characterized in that: The valve body (10) further comprises a second connecting pipe (13); a connecting port (16) is provided on the body (11); the connecting port (16) extends in a direction away from the connecting port (16) to form a flange (161); the second connecting pipe (13) is inserted into the flange (161) and is fixedly connected to the flange (161); a third solder (503) is provided on the flange (161), and a portion of the third solder (503) is in contact with the second connecting pipe (13).

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