Stop valve of small refrigeration equipment

Abstract

The utility model belongs to the technical field of stop valves, and relates to a stop valve of small refrigeration equipment, which comprises a valve body, one side of the valve body is provided with a first connecting pipe, the other side of the valve body is provided with a second connecting pipe, the valve body is connected with a valve control assembly for controlling the communication state of a valve cavity, and the valve control assembly comprises a valve rod and a valve rod nut. A first horizontal step is arranged on the inner wall of the valve body, a sealing assembly composed of a lower gasket, a graphite ring and an upper gasket is arranged above the first horizontal step, and the valve rod nut is fixedly connected with the inner wall of the valve body and presses the sealing assembly. The valve rod is in threaded connection with the valve rod nut, the communication state of the valve cavity is switched through axial displacement formed by rotation of the valve rod and the valve rod nut, the periphery of the valve rod is sleeved with the sealing assembly, and a dynamic sealing connection structure is formed between the valve rod and the valve body through the sealing assembly. According to the stop valve of the small refrigeration equipment, the use requirement of the equipment at low temperature can be better met.

Description

Technical Field

[0001] This utility model belongs to the technical field of shut-off valves, and relates to a shut-off valve for a small refrigeration device. Background Technology

[0002] Gate valves are indispensable components in refrigeration equipment, used to cut off the flow of media. Gate valves generally open and close by the axial movement of a valve disc within the valve chamber driven by a valve stem. For example, Chinese utility model patent CN211875111U (publication date: 2020.11.06) discloses a gate valve, including a valve body and a valve stem. The gate valve includes a valve chamber and a valve port, with the valve stem at least partially located in the valve chamber and moving up and down along the inner wall of the valve body via a threaded joint to open or close the valve port.

[0003] Existing gate valves use rubber sealing rings to seal the valve stem. When the operating temperature is -35°C or below, the rubber becomes brittle, loses its elasticity, and causes leakage. Moreover, in order to install rubber sealing rings, it is often necessary to machine very complex fitting structures on the valve body. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a shut-off valve for small refrigeration equipment, which can better meet the equipment's usage requirements at low temperatures. It also has the advantages of small footprint, easy processing, and low cost, making it particularly suitable for small refrigeration units.

[0005] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:

[0006] A shut-off valve for a small refrigeration device includes a valve body, a first connecting pipe on one side and a second connecting pipe on the other side, a valve control assembly for controlling the communication state of the valve cavity connected to the valve body, the valve control assembly including a valve stem and a valve stem nut, a first horizontal step on the inner wall of the valve body, a sealing assembly consisting of a lower gasket, a graphite ring and an upper gasket above the first horizontal step, the valve stem nut being fixedly connected to the inner wall of the valve body and pressing the sealing assembly, the valve stem being screwed to the valve stem nut and switching the communication state of the valve cavity by the axial displacement formed by its rotation, the sealing assembly being sleeved on the outer periphery of the valve stem, and a dynamic sealing connection structure being formed between the valve stem and the valve body through the sealing assembly.

[0007] In the shut-off valve of the aforementioned small refrigeration equipment, the outer wall of the valve stem nut is provided with external threads, and the inner wall of the valve body is provided with corresponding internal threads. The valve stem nut and the inner wall of the valve body are screwed together to form a fixed structure. The valve stem nut and the valve body can also be fixed by welding or bonding.

[0008] In the shut-off valve of the aforementioned small refrigeration equipment, the valve stem is an internal hexagonal valve stem, and its upper end is provided with an internal hexagonal groove that mates with the tooling.

[0009] In the shut-off valve of the aforementioned small refrigeration equipment, a gap is left between the outer wall of the valve stem and the inner wall of the valve body, and the inner diameter of the sealing assembly is smaller than the inner diameter of the valve body.

[0010] In the above-mentioned shut-off valve of a small refrigeration device, a valve cap is fixed at the upper end of the valve body, a second horizontal step is provided inside the valve cap, and a sealing ring is provided below the second horizontal step to seal and connect with the end face of the valve body. The valve cap covers the valve stem and valve stem nut and seals the cavity above them. Preferably, the valve cap is screwed to the valve body and presses the sealing ring.

[0011] In the shut-off valve of the aforementioned small refrigeration equipment, the graphite ring, the upper gasket, and the sealing ring form a triple sealing protection structure for the shut-off valve.

[0012] In the shut-off valve of the aforementioned small refrigeration equipment, the upper gasket and sealing ring are made of elastic material, preferably polytetrafluoroethylene, while the lower gasket is made of rigid material, preferably metal.

[0013] In the shut-off valve of the aforementioned small refrigeration equipment, the first connecting pipe is detachably connected to the first connector, the second connecting pipe is detachably connected to the second connector, the valve body and the first and second connecting pipes are made of carbon steel, and the first and second connectors are made of copper.

[0014] In the shut-off valve of the aforementioned small refrigeration equipment, the valve body is round on top and square on the bottom. The first connecting pipe is positioned horizontally higher than the second connecting pipe. The bottom of the valve body is provided with a threaded mounting hole, which is located on any of the following sides: the bottom side, the left side where the first connecting pipe is located, the front side, and the rear side.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] 1. This utility model provides a shut-off valve for a small refrigeration device, which uses a sealing assembly consisting of a lower gasket, a graphite ring, and an upper gasket to seal the valve stem. Because the graphite ring is more stable at low temperatures, the shut-off valve provided by this utility model can meet the requirements of low-temperature operating environments of -35°C and below. Furthermore, the shut-off valve of this utility model uses a rigid lower gasket and an elastic upper gasket, which can better support the graphite ring and achieve better sealing performance.

[0017] 2. This utility model reduces valve size and cost in multiple ways: the valve body adaptation structure of the sealing component is easier to process and has a lower cost; the use of an internal hexagonal valve stem structure can reduce valve size and save material input; the main structure of the valve can use carbon steel instead of copper, saving costs. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is an axial sectional view of the present invention;

[0020] Figure 3 This is a partial axial sectional view of the present invention;

[0021] Reference numerals: 1. Valve body; 2. First connecting pipe; 3. Second connecting pipe; 4. Valve stem; 5. Valve stem nut; 6. First horizontal step; 7. Lower gasket; 8. Graphite ring; 9. Upper gasket; 10. Hexagonal recess; 11. Valve cap; 12. Second horizontal step; 13. Sealing ring; 14. First connector; 15. Second connector. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 :

[0023] A shut-off valve for a small refrigeration device includes a valve body 1. A first connecting pipe 2 is provided on one side of the valve body 1, and a second connecting pipe 3 is provided on the other side. A valve control assembly for controlling the communication state of the valve cavity is connected to the valve body 1. The valve control assembly includes a valve stem 4 and a valve stem nut 5. A first horizontal step 6 is provided on the inner wall of the valve body 1. A sealing assembly consisting of a lower gasket 7, a graphite ring 8, and an upper gasket 9 is provided above the first horizontal step 6. The valve stem nut 5 is fixedly connected to the inner wall of the valve body 1 and presses the sealing assembly. The valve stem 4 is screwed to the valve stem nut 5, and the axial displacement formed by its rotation switches the communication state of the valve cavity. The sealing assembly is sleeved on the outer periphery of the valve stem 4, and a dynamic sealing connection structure is formed between the valve stem 4 and the valve body 1 through the sealing assembly.

[0024] In this embodiment, the outer wall of the valve stem nut 5 is provided with external threads, and the inner wall of the valve body 1 is provided with corresponding internal threads. The valve stem nut 5 is screwed to the inner wall of the valve body 1 to form a fixed structure.

[0025] During installation, the lower gasket 7, graphite ring 8, and upper gasket 9 are placed sequentially on the first horizontal step 6 inside the valve body 1. Then, the valve stem nut 5 is pre-installed onto the valve body 1. Next, the valve stem 4 is passed through the sealing assembly and screwed onto the valve stem nut 5. If necessary, the valve stem nut 5 can be tightened to ensure the sealing assembly is securely pressed. The usage method of this embodiment is the same as that of existing gate valves. By rotating the valve stem 4, the valve stem 4 moves axially relative to the valve stem nut 5 and the valve body 1, thereby opening or closing the valve chamber through the valve disc on the valve stem 4.

[0026] The valve stem 4 is an internal hexagonal valve stem with an internal hexagonal groove 10 at its upper end that mates with the tooling. The internal hexagonal valve stem structure can shorten the axial dimension of the valve stem 4, making the stop valve occupy less space.

[0027] To ensure sealing performance and flexible rotation of the valve stem 4, while avoiding interference between the stem and the valve stem 4, a gap is left between the outer wall of the valve stem 4 and the inner wall of the valve body 1, and the inner diameter of the sealing assembly is smaller than the inner diameter of the valve body 1.

[0028] To protect the valve control components and further enhance sealing, a valve cap 11 is fixed to the upper end of the valve body 1. A second horizontal step 12 is provided inside the valve cap 11. A sealing ring 13 that is sealed and connected to the end face of the valve body 1 is provided below the second horizontal step 12. The valve cap 11 covers the valve stem 4 and the valve stem nut 5 and seals the cavity above them. Preferably, the valve cap 11 is screwed to the valve body 1 and presses the sealing ring 13.

[0029] Through the above design, the graphite ring 8, the upper gasket 9, and the sealing ring 13 in this embodiment form a triple sealing protection structure for the shut-off valve.

[0030] In this embodiment, the upper gasket 9 and the sealing ring 13 are made of elastic material, preferably polytetrafluoroethylene. During the installation process, the valve stem 4 nut acts on the upper gasket 9, causing it to deform, thereby enhancing the sealing performance and better compressing the graphite ring 8. The lower gasket 7 is made of rigid material, preferably metal. By setting the rigid lower gasket 7, the graphite ring 8 can be stably supported in the valve body 1.

[0031] The first connecting pipe 2 is detachably connected to the first connector 14, and the second connecting pipe 3 is detachably connected to the second connector 15. The valve body 1, the first connecting pipe 2, and the second connecting pipe 3 are made of carbon steel, while the first connector 14 and the second connector 15 are made of copper. By replacing copper with steel, costs can be further reduced.

[0032] The valve body 1 is round on top and square on the bottom. The first connecting pipe 2 is positioned at a higher horizontal position than the second connecting pipe 3. The bottom of the valve body 1 is provided with a threaded mounting hole, which is located on any of the following sides: the bottom surface, the left side where the first connecting pipe 2 is located, the front side, and the rear side. By selecting the mounting surface, this embodiment can have better adaptability.

[0033] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A shut-off valve for a small refrigeration device, comprising a valve body (1), wherein a first connecting pipe (2) is provided on one side of the valve body and a second connecting pipe (3) is provided on the other side, and a valve control assembly for controlling the communication state of the valve chamber is connected to the valve body (1), characterized in that, The valve control assembly includes a valve stem (4) and a valve stem nut (5). A first horizontal step (6) is provided on the inner wall of the valve body (1). A sealing assembly consisting of a lower gasket (7), a graphite ring (8), and an upper gasket (9) is provided above the first horizontal step (6). The valve stem nut (5) is fixedly connected to the inner wall of the valve body (1) and presses the sealing assembly. The valve stem (4) is screwed to the valve stem nut (5) and the axial displacement formed by its rotation switches the communication state of the valve chamber. The sealing assembly is sleeved on the outer periphery of the valve stem (4). The valve stem (4) and the valve body (1) form a dynamic sealing connection structure through the sealing assembly.

2. The shut-off valve for a small refrigeration device according to claim 1, characterized in that, The valve stem (4) is an internal hexagonal valve stem, and its upper end is provided with an internal hexagonal groove (10) that mates with the tooling.

3. The shut-off valve for a small refrigeration device according to claim 1, characterized in that, There is a gap between the outer wall of the valve stem (4) and the inner wall of the valve body (1), and the inner diameter of the sealing assembly is smaller than the inner diameter of the valve body (1).

4. The shut-off valve for a small refrigeration device according to claim 1, characterized in that, A valve cap (11) is fixed at the upper end of the valve body (1). A second horizontal step (12) is provided inside the valve cap (11). A sealing ring (13) is provided below the second horizontal step (12) and is sealed to the end face of the valve body (1). The valve cap (11) covers the valve stem (4) and valve stem nut (5) and seals the cavity above them.

5. The shut-off valve for a small refrigeration device according to claim 4, characterized in that, The graphite ring (8), upper gasket (9), and sealing ring (13) form a triple sealing protection structure for the shut-off valve.

6. The shut-off valve for a small refrigeration device according to claim 5, characterized in that, The upper gasket (9) and sealing ring (13) are made of polytetrafluoroethylene, and the lower gasket (7) is made of metal.

7. The shut-off valve for a small refrigeration device according to claim 1, characterized in that, The first connecting pipe (2) is detachably connected to the first connector (14), and the second connecting pipe (3) is detachably connected to the second connector (15). The valve body (1), the first connecting pipe (2), and the second connecting pipe (3) are made of carbon steel, and the first connector (14) and the second connector (15) are made of copper.

8. The shut-off valve for a small refrigeration device according to claim 1, characterized in that, The valve body (1) is round on top and square on the bottom. The first connecting pipe (2) is located at a higher horizontal position than the second connecting pipe (3). The bottom of the valve body (1) is provided with a threaded mounting hole, which is located on any of the following sides: the bottom side, the left side where the first connecting pipe (2) is located, the front side, and the rear side.

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