Stop valve

Abstract

The stop valve comprises a valve body and a valve rod, external threads of the valve rod are in threaded connection with internal threads of the inner wall of the valve body, the right end of the valve body is connected with a first connecting pipe, the lower end of the valve body is provided with an opening, and the stop valve is characterized in that the opening is connected with a second connecting pipe, the second connecting pipe is provided with a flaring part, and the flaring part is provided with an opening. The flaring part is inserted into the opening, and the second connecting pipe is connected with the valve body in a welded mode. According to the stop valve, the second connecting pipe with the flaring part is adopted to replace a valve port assembly, welding spots are reduced, the welding difficulty is lowered, the valve port is prevented from being heated and deformed during welding, and the leakage risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a shut-off valve for controlling the flow of refrigerant. Background Technology

[0002] Gate valves are mainly used to shut off or connect the refrigerant in large-scale refrigeration, cold storage, and air conditioning systems.

[0003] like Figure 4 This is a schematic diagram of an existing gate valve. The gate valve includes a valve body 1′, a valve stem 2′, and a valve port assembly 3′. The right end of the valve body 1′ is connected to a first connecting pipe 11′, and an opening is formed at the lower end. The valve port assembly 3′ is installed at the opening. A second connecting pipe 32′ is partially inserted into the valve port 31′ and welded to the valve port to form the valve port assembly 3′. The valve stem 2′ is located in the inner cavity of the valve body 1′ and has external threads. The inner wall of the valve body 1′ has internal threads that mate with the external threads of the valve stem 2′. Therefore, when the valve stem 2′ rotates, it moves up and down within the inner cavity of the valve body 1′ under the action of the threaded pair, thereby closing or connecting the first connecting pipe 11′ and the second connecting pipe 32′.

[0004] In the above shut-off valve structure, the second connecting pipe is inserted into the valve port and welded to the valve port to form a valve port assembly; then the valve port assembly is installed at the opening of the valve body and welded to the valve body; thus achieving a fixed connection between the valve body, the valve port and the second connecting pipe.

[0005] The valve port and the second connecting pipe have a welding point a, and the valve port and the valve body have a welding point b. Because the distance between the welding point b of the valve port and the valve body and the welding point a of the valve port and the second connecting pipe is relatively close, welding point b will interfere with welding point a, resulting in a high leakage failure rate of welding point a, which will affect the cost of the entire product; and the valve port will be greatly deformed by heat when welding point b, which will affect the internal leakage when the valve is closed. Utility Model Content

[0006] The technical problem to be solved by this utility model is: in order to solve the technical problem of mutual interference of weld points and excessively close distance between weld points and valve ports in the prior art, this utility model provides a shut-off valve that uses a second connecting pipe with a flared end to replace the valve port assembly, thereby reducing weld points, reducing welding difficulty, reducing parts, avoiding heat deformation of the valve port during welding, and reducing the risk of leakage.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a stop valve, including a valve body and a valve stem, wherein the external thread of the valve stem is threadedly connected to the internal thread of the inner wall of the valve body, a first connecting pipe is connected to the right end of the valve body, and the lower end of the valve body has an opening, wherein a second connecting pipe is connected to the opening, the second connecting pipe has a flared part, the flared part is inserted into the opening, and the second connecting pipe is welded to the valve body.

[0008] This utility model of a gate valve achieves a fixed connection between the valve body and the second connecting pipe by directly welding the flared part of the second connecting pipe to the valve body, reducing welding difficulty, reducing the number of parts, and reducing the risk of leakage.

[0009] Furthermore, in order to reduce the number of weld points, the second connecting pipe is connected to the valve body by only one weld.

[0010] Furthermore, in order to ensure the welded connection between the second connector and the valve port, the welded part is the area formed by welding between the outer circle of the flared part and the inner wall of the opening.

[0011] Furthermore, to avoid the high temperature of welding affecting the valve body and the second connecting pipe, the outer circle of the flared part is connected to the inner wall of the opening by brazing.

[0012] Furthermore, in order to achieve a seal between the valve stem and the flared portion, the bottom of the valve stem has a conical surface, and the upper end face of the flared portion mates with the conical surface to form a sealing pair.

[0013] Furthermore, in order to control the opening or closing of the valve body, the internal thread of the valve body engages with the external thread of the valve stem to form a threaded pair, and the rotation of the valve stem causes the conical surface to fit or separate from the upper end face of the flared part, thereby opening or closing the valve flow channel.

[0014] Furthermore, the flared portion is formed by cold working of the second connecting pipe.

[0015] Furthermore, the second connector is made of T2Y2 or TP2Y2 material.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The gate valve of this utility model uses a second connecting pipe instead of the valve port assembly. The second connecting pipe is welded to the valve body through the flared part. This not only eliminates the need for the valve port assembly, but also reduces the number of welding points, reduces the risk of leakage, and lowers the manufacturing cost of the product. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the shut-off valve of this utility model;

[0020] Figure 2 This is a schematic diagram of the second connecting pipe structure;

[0021] Figure 3 This is a schematic diagram of the external structure of a gate valve;

[0022] Figure 4This is a schematic diagram of an existing shut-off valve.

[0023] In the diagram: 1. Valve body, 2. Valve stem, 21. Conical surface, 3. First connecting pipe, 4. Second connecting pipe, 41. Flared end, 42. Welded part. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] like Figure 1 and Figure 2 As shown, a gate valve includes a valve body 1 and a valve stem 2. The external thread of the valve stem 2 is threadedly connected to the internal thread of the inner wall of the valve body 1. A first connecting pipe 3 is connected to the right end of the valve body 1, and the lower end of the valve body 1 has an opening. A second connecting pipe 4 is connected to the opening, and the second connecting pipe 4 has a flared portion 41. The flared portion 41 is inserted into the opening, and the second connecting pipe 4 is welded to the valve body 1. In this application, a flared portion 41 structure is adopted at the upper end of the second connecting pipe 4. By replacing the valve port assembly of the existing gate valve with the flared portion 41 structure, the number of parts is reduced, and the welding process is also reduced.

[0028] Specifically, the second connecting pipe 4 and the valve body 1 are connected by only one welded part 42. Compared with existing gate valves, the welding of the second connecting pipe 4 and the valve body 1 can be achieved through only one welded part 42, which reduces the welding difficulty.

[0029] Preferably, the welded portion 42 is the area formed by welding between the outer circle of the flared portion 41 and the inner wall of the opening. The outer circle of the flared portion 41 and the inner wall of the opening are connected by brazing. Brazing is used because the heating temperature is low, avoiding the impact of high temperature on the valve body 1 and the second connecting pipe 4, preventing the valve port from deforming due to heat, and reducing the risk of leakage.

[0030] Specifically, the bottom of the valve stem 2 has a conical surface 21, and the upper end face of the flared portion 41 mates with the conical surface 21 to form a sealing pair. The internal thread of the valve body 1 meshes with the external thread of the valve stem 2 to form a threaded pair. Rotation of the valve stem 2 causes the conical surface 21 to engage or disengage with the upper end face of the flared portion 41, thereby opening or closing the valve flow passage. Rotation of the valve stem 2 can realize the opening and closing of the shut-off valve. The second connecting pipe 4 and the flared portion 41 replace the valve port assembly of the prior art, while ensuring the normal operation of the shut-off valve.

[0031] In other embodiments, the flared portion 41 is formed by cold working of the second connecting pipe 4, which can ensure that the flared portion 41 has high strength and hardness.

[0032] In other embodiments, the second connector 4 is made of T2Y2 or TP2Y2 material.

[0033] In summary, the gate valve uses a second connecting pipe with a flared end to replace the valve port assembly, reducing weld points, lowering welding difficulty, reducing parts, avoiding heat deformation of the valve port during welding, and reducing the risk of leakage.

[0034] The above description is based on the preferred embodiments of this utility model. Through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A shut-off valve, comprising a valve body (1) and a valve stem (2), wherein the external thread of the valve stem (2) is threadedly connected to the internal thread of the inner wall of the valve body (1), a first connecting pipe (3) is connected to the right end of the valve body (1), and the lower end of the valve body (1) has an opening, characterized in that, A second connector (4) is connected to the opening. The second connector (4) has a flared portion (41). The flared portion (41) is inserted into the opening. The second connector (4) is welded to the valve body (1).

2. The shut-off valve according to claim 1, characterized in that, The second connecting pipe (4) is connected to the valve body (1) by only one weld (42).

3. The shut-off valve according to claim 2, characterized in that, The welded part (42) is the area formed by welding between the outer circle of the flared part (41) and the inner wall of the opening.

4. The shut-off valve according to claim 3, characterized in that, The outer circle of the flared part (41) is connected to the inner wall of the opening by brazing.

5. The shut-off valve according to claim 1, characterized in that, The bottom of the valve stem (2) has a conical surface (21), and the upper end face of the flared part (41) cooperates with the conical surface (21) to form a sealing pair.

6. The shut-off valve according to claim 5, characterized in that, The internal thread of the valve body (1) meshes with the external thread of the valve stem (2) to form a threaded pair. The valve stem (2) rotates to make the conical surface (21) fit or separate from the upper end face of the flared part (41), thereby opening or closing the valve flow channel.

7. The shut-off valve according to claim 5, characterized in that, The flared part (41) is formed by cold working of the second connecting pipe (4).

8. The shut-off valve according to claim 1, characterized in that, The second connector (4) is made of T2Y2 or TP2Y2 material.

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