Integrated high-low pressure liquid-gas switching valve

Abstract

The utility model relates to the technical field of switchable valves, in particular to an integrated high-low pressure liquid-gas switching valve which comprises a valve body, a groove with an opening in the upper portion is formed in the middle of the valve body, a valve rod is arranged in the groove, the top of the valve rod is connected with the telescopic end of an air cylinder or an oil cylinder, and the air cylinder or the oil cylinder drives the valve rod to move up and down in the groove of the valve body. Two protruding parts are arranged in the middle of the valve rod, a cavity with the caliber larger than that of other parts is formed in the middle of the groove, matching cavities are formed in the upper end and the lower end of the cavity respectively, and the matching cavities are used for containing and limiting the protruding parts of the valve rod. One sides of the two matched cavities are respectively communicated with a high-pressure liquid inlet and a low-pressure gas or liquid inlet through channels, and one side of each cavity is communicated with an outlet through a channel. The switching valve has the advantages that free switching between high-pressure fluid and low-pressure fluid is achieved, synchronism and interlocking performance of the switching valve are improved, operation reliability is improved, manual configuration is reduced, and production cost and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of switchable valves, in particular to an integrated high- and low-pressure liquid-gas switching valve. Background Art

[0002] Modern industry has an increasing demand for fluid control accuracy and efficiency. With the continuous improvement of industrial automation and intelligence, traditional fluid control equipment can no longer meet the high-precision and high-efficiency production requirements. Especially in situations involving high- and low-pressure gas-liquid switching, such as chemical, petroleum, natural gas, metallurgy and other fields, the performance requirements for switching valves are more stringent.

[0003] In the production process, the alternating use of high- and low-pressure liquids is very common, so a reliable and efficient switching valve is needed to ensure the smooth flow of fluids and the smooth progress of production. However, traditional switching valves have some problems when switching between high- and low-pressure gas and liquid. On the one hand, the synchronization and interlocking are not high enough, which may lead to leakage or misoperation during the switching process; on the other hand, the operation is not reliable enough and requires more manual configuration, which increases production costs and safety hazards.

[0004] Therefore, there is an urgent need to design a reliable high-low pressure gas-liquid switching valve to meet the requirements for fluid control accuracy and efficiency. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provide an integrated high- and low-pressure liquid-gas switching valve for realizing free high- and low-pressure switching of the internal fluid of a CNC cleaning machine.

[0006] In order to achieve the above-mentioned purpose, an integrated high-low pressure liquid-gas switching valve is designed, including a valve body, a groove with an upper opening is provided in the middle of the valve body, a valve stem is provided in the groove, the top of the valve stem is connected to the telescopic end of a cylinder or an oil cylinder, and the cylinder or the oil cylinder drives the valve stem to move up and down in the groove of the valve body; two protrusions are provided in the middle of the valve stem, and a cavity with a larger diameter than other parts is provided in the middle of the groove, and matching cavities are respectively provided at the upper and lower ends of the cavity, and the matching cavities are used to accommodate and limit the protrusions of the valve stem, and one side of the two matching cavities is connected to the high-pressure liquid inlet and the low-pressure gas or liquid inlet through channels respectively, and one side of the cavity is connected to the outlet through the channel.

[0007] Preferably, the upper and lower ends of the matching cavity of the utility model are both provided with inclined surfaces, which cooperate with the inclined surfaces at both ends of the valve stem protrusion to limit the position.

[0008] Preferably, the raised portion of the valve stem of the utility model is provided with sealing rings arranged up and down.

[0009] Preferably, the valve body of the utility model comprises an upper valve body and a lower valve body, the connection between the upper valve body and the lower valve body is a step structure, and a sealing ring is provided at the step structure.

[0010] Preferably, the spacing between the two protrusions of the valve stem of the utility model is different from the spacing between the two matching cavities of the valve body, so that when one of the protrusions is matched and connected with the matching cavity, the other protrusion and the other matching cavity are misaligned with each other.

[0011] Preferably, the utility model provides sealing rings at the upper and lower ends of the groove to seal with the valve stem.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The utility model realizes free switching between high and low pressure fluids through the cooperation of the cavity and groove in the valve body and the valve stem. The utility model has a simple structure, and the opening and closing are more reliable by the mechanical drive device, which reduces the potential safety hazards in production. The design of the flow channel in the valve body ensures that one end is closed and the other end is opened synchronously when the high and low pressure fluids are switched, which reduces the possibility of misoperation and fluid leakage. The cooperation between the valve body and the valve stem has good airtightness, which greatly reduces the possibility of fluid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 , a schematic diagram of the structure of the utility model;

[0015] In the figure: 1 valve body; 1-1 upper valve body; 1-2 lower valve body; 1-3 step structure; 2 groove; 2-1 cavity; 2-2 matching cavity; 3 valve stem; 3-1 raised part; 4 cylinder or oil cylinder; 5 high-pressure liquid inlet; 6 low-pressure gas or liquid inlet; 7 outlet; 8 sealing ring. DETAILED DESCRIPTION

[0016] In order to make the purpose, principle and structure of the utility model clearer, it is further described below in conjunction with the drawings and specific embodiments.

[0017] See also Figure 1The utility model provides an integrated high-low pressure liquid-gas switching valve, including a valve body 1, a groove 2 with an upper opening is provided in the middle of the valve body 1, a valve stem 3 is provided in the groove 2, the top of the valve stem 3 is connected to the telescopic end of the cylinder or oil cylinder 4, and the cylinder or oil cylinder 4 drives the valve stem 3 to move up and down in the groove 2 of the valve body 1; two protrusions 3-1 are provided in the middle of the valve stem 1, a cavity 2-1 with a larger diameter than other parts is provided in the middle of the groove 2, and matching cavities 2-2 are respectively provided at the upper and lower ends of the cavity, and the matching cavity 2-2 is used to accommodate and limit the protrusion 3-1 of the valve stem 3, one side of the two matching cavities 2-1 is connected to the high-pressure liquid inlet 5 and the low-pressure gas or liquid inlet 6 through a channel respectively, and one side of the cavity 2-1 is connected to the outlet through a channel.

[0018] The upper and lower ends of the matching cavity 2-2 are provided with inclined surfaces, which cooperate with the inclined surfaces at both ends of the protrusion 3-1 of the valve stem 3 to limit the position. The protrusion 3-1 of the valve stem is provided with sealing rings 8 arranged at the upper and lower ends. The valve body 1 includes an upper valve body 1-1 and a lower valve body 1-2. The connection between the upper valve body 1-1 and the lower valve body 1-2 is a step structure 1-3, and a sealing ring 8 is provided at the step structure 1-3. The spacing between the two protrusions 3-1 of the valve stem is different from the spacing between the two matching cavities 2-2 of the valve body, so that when one of the protrusions 3-1 is connected with the matching cavity 2-2, the other protrusion 3-1 is misaligned with the other matching cavity 2-2. The upper and lower ends of the groove are provided with sealing rings to seal with the valve stem.

[0019] When it is necessary to switch to high-pressure fluid, the oil cylinder or air cylinder 4 pushes the valve stem 2 to move downward, and the raised portion 3-1 at the lower end of the valve stem is tightly matched with the matching cavity 2-2 at the lower end of the valve body 1. At this time, the high-pressure fluid flows in from the high-pressure fluid inlet 5, enters the cavity 2-1 through the fluid channel in the valve body, and finally flows out through the outlet 7. At this time, the raised portion 3-1 at the upper end of the valve stem is misaligned with the matching cavity 2-2 at the upper end of the valve body 1, and a cavity is formed between the upper inclined surface of the upper raised portion 3-1 and the matching cavity 2-2. The sealing ring at the upper end of the upper raised portion 3-1 isolates the cavity from the cavity 2-1 in the lower valve body and does not conduct, thereby realizing the synchronous interlocking of the valve and avoiding leakage or misoperation that may occur during the switching process.

[0020] When it is necessary to switch to low-pressure fluid, the oil cylinder or air cylinder 4 pulls up the valve stem 2 to move upward, and the raised portion 3-1 at the upper end of the valve stem is tightly matched with the matching cavity 2-2 at the upper end of the valve body 1. At this time, the low-pressure fluid flows in from the low-pressure fluid inlet 6, enters the cavity 2-1 through the fluid channel in the valve body, and finally flows out through the outlet 7. At this time, the raised portion 3-1 at the lower end of the valve stem is misaligned with the matching cavity 2-2 at the lower end of the valve body 1, and a cavity is formed between the lower inclined surface of the lower raised portion 3-1 and the matching cavity 2-2. The sealing ring at the lower end of the lower raised portion 3-1 isolates the cavity from the cavity 2-1 in the upper valve body and does not conduct, thereby realizing the synchronous interlocking of the valve and avoiding leakage or misoperation that may occur during the switching process.

[0021] At the same time, since the oil cylinder or the air cylinder 4 is used to drive the valve body to move to realize the function switching, the operation is reliable, the manual configuration is reduced, and the production cost and safety hazards are reduced.

[0022] The above is only a specific implementation method of this utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the utility model, according to the technical solution and new concept of the utility model, shall be covered by the protection scope of the utility model.

Claims

1. An integrated high-low pressure liquid-gas switching valve, including a valve body, characterized in that The middle part of the valve body is provided with a groove with an upper opening, a valve stem is provided in the groove, the top of the valve stem is connected to the telescopic end of the cylinder or the oil cylinder, and the cylinder or the oil cylinder drives the valve stem to move up and down in the groove of the valve body; The middle part of the valve stem is provided with two protrusions. A cavity with a larger diameter than other parts is provided in the middle of the groove, and matching cavities are provided at the upper and lower ends of the cavity respectively. The matching cavities are used to accommodate and limit the raised portion of the valve stem, and one side of the two matching cavities is connected to the high-pressure liquid inlet and the low-pressure gas or liquid inlet through channels respectively, and one side of the cavity is connected to the outlet through the channel.

2. An integrated high-low pressure liquid-gas switching valve as claimed in claim 1, characterized in that The upper and lower ends of the matching cavity are both provided with inclined surfaces, which cooperate with the inclined surfaces at both ends of the valve stem protrusion to limit the position.

3. The integrated high and low pressure liquid-gas switching valve according to claim 1, characterized in that The raised parts of the valve stem are all provided with sealing rings arranged up and down.

4. The integrated high and low pressure liquid-gas switching valve according to claim 1, characterized in that The valve body comprises an upper valve body and a lower valve body, the connection between the upper valve body and the lower valve body is a step structure, and a sealing ring is arranged at the step structure.

5. The integrated high and low pressure liquid-gas switching valve according to claim 1, characterized in that The distance between the two protrusions of the valve stem and the distance between the two matching cavities of the valve body are different, so that when one of the protrusions is matched and connected with the matching cavity, the other protrusion and the other matching cavity are misaligned with each other.

6. The integrated high and low pressure liquid-gas switching valve according to claim 1, characterized in that The upper and lower ends of the groove are provided with sealing rings which are sealed to cooperate with the valve stem.

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