Stable negative pressure reducing valve
By designing a stable negative pressure pressure decompression valve, including pressure regulating cavity, membrane lid and regulating component, the existing negative pressure decompression valve cannot regulate liquid or combustible and corroded gas pressure, and realizes various media for various media Pressure regulation and improvement of valve core stability.
Patent Information
- Application Number
- CN202420011648.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-03
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-01-03
AI Technical Summary
Existing negative pressure reducing valves cannot adjust the pressure of liquids or combustible or corrosive gases, and cannot adjust the pressure when the valve inlet is positive and the outlet requires negative pressure.
A stable negative pressure pressure decompression valve is designed, including valve body, pressure regulation, membrane lid, enhanced plate, valve stem, valve core, and adjustment component. By regulating the elasticity of the spring, the balance of the pressure reduction valve is accurately controlled to ensure that the pressure value of the upper and lower of the valve core is the same, so as to stabilize the negative pressure.
The pressure regulation of liquid, combustible or corrosive gases is realized, and the pressure can be effectively adjusted when the valve import is positive pressure and the export needs to be negative pressure, which improves the stability of the valve core.
Smart Images
Figure CN222392044U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valves, in particular to a stable negative pressure reducing valve. Background Art
[0002] With the development of industry, pressure reducing valves are used in gas and liquid pipelines in electronics, semiconductors, petrochemicals, biopharmaceuticals, laboratories, universities, etc. They can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals and radioactive media. They mainly play a role in stabilizing pressure in pipelines. Commonly used systems include reactors, fluid metering and dosing systems, hydraulic control systems, chemical reaction conditions, and critical state control of physical states.
[0003] The existing negative pressure reducing valve can only be connected to the vacuum pump to adjust the pressure on the other side of the valve, and can only be used for air. For liquids and flammable or corrosive gases, the existing negative pressure valve cannot adjust the pressure. It also cannot adjust the pressure when the valve inlet is positive pressure and the outlet requires negative pressure. Utility Model Content
[0004] The purpose of the utility model is to provide a negative pressure reducing valve that can be used to adjust the negative pressure at the liquid outlet, can be used in the case where the valve inlet is positive pressure and the outlet needs to adjust the negative pressure, and can be used in the working conditions where the inlet of flammable or corrosive gas is positive pressure and the outlet adjusts the negative pressure, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stable negative pressure reducing valve, comprising a valve body, an air inlet and an air outlet are respectively provided at the left and right ends of the valve body, a pressure regulating chamber is provided in the valve body, a membrane cover is installed in the pressure regulating chamber, the membrane cover divides the pressure regulating chamber into a first chamber and a second chamber, the first chamber is communicated with atmospheric pressure, the second chamber is communicated with the air inlet and the air outlet, a reinforcing plate is fixedly connected to the membrane cover, a valve stem is fixedly connected to the reinforcing plate and the membrane cover, a valve core is fixedly connected to the bottom end of the valve stem, a back cover is fixedly connected to the bottom end of the valve body, a sealing gasket is provided on the top of the valve stem and the valve core, the sealing gasket is in contact with the valve body, the air inlet and the second chamber are closed by the sealing gasket, the valve core is slidably connected to the back cover, an O-ring is provided between the valve core and the back cover, an adjusting component is provided on the valve stem, a spring is provided between the adjusting component and the valve body, and a connecting pipe is provided on the valve stem and the valve core.
[0006] Optionally, the valve body comprises an upper cover and a lower cover, the upper cover and the lower cover are fixedly connected and sealed, and there is a gap of 1-1.5 mm between the upper cover and the valve stem.
[0007] Optionally, the adjustment assembly includes a locking screw installed on the upper cover, the number of the locking screws is two, a positioning pin is fixedly connected to the valve stem, the positioning pin is located between the two locking screws, and a handle is threadedly connected to the valve stem.
[0008] Compared with the prior art, the beneficial effects of the utility model are:
[0009] The utility model adjusts the elastic force value of the spring through the adjusting component, and accurately controls the balance state of the pressure reducing valve through the change of the elastic force value. The pressure values above and below the valve core are the same, which can avoid the amplitude generated when the valve core is in the open state and improve the stability of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic diagram of the structure of the utility model;
[0011] Figure 2 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION
[0012] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.
[0013] like Figure 1 to Figure 2 As shown, a stable negative pressure reducing valve comprises a valve body 1, wherein an air inlet 11 and an air outlet 12 are respectively arranged at the left and right ends of the valve body 1, a pressure regulating chamber 2 is arranged in the valve body 1, a membrane cover 21 is installed in the pressure regulating chamber 2, the membrane cover 21 divides the pressure regulating chamber 2 into a first chamber 201 and a second chamber 202, the first chamber 201 is communicated with the atmospheric pressure, the second chamber 202 is communicated with the air inlet 11 and the air outlet 12, a reinforcing plate 22 is fixedly connected to the membrane cover 21, a valve stem 23 is fixedly connected to the reinforcing plate 22 and the membrane cover 21, and the valve stem 23 is fixedly connected to the A valve core 24 is fixedly connected to the bottom end, and a back cover 13 is fixedly connected to the bottom end of the valve body 1. A sealing gasket 25 is arranged on the top of the valve stem 23 and the valve core 24. The sealing gasket 25 is in contact with the valve body 1, and the air inlet 11 and the second cavity 202 are closed by the sealing gasket 25. The valve core 24 is slidably connected to the back cover 13, and an O-ring 26 is arranged between the valve core 24 and the back cover 13. An adjusting component 27 is arranged on the valve stem 23, and a spring 28 is arranged between the adjusting component 27 and the valve body 1. A connecting pipe 29 is opened on the valve stem 23 and the valve core 24.
[0014] It should be noted that the valve body 1 includes an upper cover 101 and a lower cover 102, which are fixedly connected and sealed. There is a 1-1.5mm gap between the upper cover 101 and the valve stem 23, which can ensure that the first cavity 201 is connected to the external air, so that the first cavity 201 is equivalent to the atmospheric pressure, and the gap between the valve stem 23 and the upper cover 101 can enable the valve stem 23 to move up and down.
[0015] It should be noted that the adjustment component 27 includes a locking screw 271 installed on the upper cover 101, and the number of the locking screws 271 is two. A positioning pin 272 is fixedly connected to the valve stem 23, and the positioning pin 272 is located between the two locking screws 271. A handle 273 is threadedly connected to the valve stem 23. The elastic force of the spring 28 can be adjusted by turning the handle 273. The positioning pin 272 is located between the locking screws 271, and the locking screw 271 is used to achieve a limiting effect on the positioning pin 272.
[0016] according to Figure 1 to Figure 2 It is known that according to formula F 弹簧力 +P2*S2=P0*S2, turn the handle 273 to adjust the valve body 1 to a balanced state. When the valve body 1 is in a balanced state, the air inlet 11 is closed, and the air outlet 12 is connected to the second cavity 202. When the pressure value of P2 increases, F 弹簧力 +P2*S2>P0*S2 will squeeze the membrane cover 21 upward, drive the valve stem 23 to move upward, drive the valve core 24 and the valve body 1 to squeeze more tightly, so that the valve core 24 is always in a closed state. When the pressure value of P2 becomes smaller and exceeds the set pressure value, F 弹簧力 +P2*S2<P0*S 2， The valve stem 23 is pulled downward, and the valve stem 23 drives the valve core 24 to move downward. At this time, the air inlet 11 is connected with the first cavity 201, and the gas enters the valve body 1. When the air pressure reaches the equilibrium value again, the valve core 24 will close again, and when the valve body 1 is in the open and closed state, P2 = P A The upper and lower pressure values of the valve core 24 can be kept equal all the time, thereby improving the stability of the valve core 24 .
[0017] It should be noted that the pressure in the first cavity 201 is P0, the area of the membrane cover 21 is S2, the pressure at the air inlet 11 is P1, and the pressure at the air outlet 12 is P 2， The pressure below the valve core is P A .
[0018] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A stable negative pressure reducing valve, comprising a valve body (1), wherein the valve body (1) is provided with an air inlet (11) and an air outlet (12) at the left and right ends thereof, and characterized in that: The valve body (1) is provided with a pressure regulating chamber (2), and a membrane cover (21) is installed in the pressure regulating chamber (2). The membrane cover (21) divides the pressure regulating chamber (2) into a first chamber (201) and a second chamber (202), wherein the first chamber (201) is connected to atmospheric pressure, and the second chamber (202) is connected to an air inlet (11) and an air outlet (12). A reinforcing plate (22) is fixedly connected to the membrane cover (21), and a valve stem (23) is fixedly connected to the reinforcing plate (22) and the membrane cover (21). The bottom end of the valve stem (23) is fixedly connected to a valve core (24), and the bottom end of the valve body (1) is fixedly connected to a valve core (24). A rear cover (13) is provided, and a sealing gasket (25) is arranged on the top of the valve stem (23) and the valve core (24), and the sealing gasket (25) is in contact with the valve body (1), and the air inlet (11) and the second cavity (202) are closed by the sealing gasket (25), the valve core (24) is slidably connected to the rear cover (13), an O-ring (26) is arranged between the valve core (24) and the rear cover (13), an adjusting component (27) is arranged on the valve stem (23), a spring (28) is arranged between the adjusting component (27) and the valve body (1), and a connecting pipe (29) is opened on the valve stem (23) and the valve core (24).
2. A stable negative pressure relief valve according to claim 1, characterized in that: The valve body (1) comprises an upper cover (101) and a lower cover (102), wherein the upper cover (101) and the lower cover (102) are fixedly connected and sealed, and a gap of 1-1.5 mm exists between the upper cover (101) and the valve stem (23).
3. A stable negative pressure relief valve according to claim 2, characterized in that: The adjustment assembly (27) includes a locking screw (271) installed on the upper cover (101), the number of the locking screws (271) is two, a positioning pin (272) is fixedly connected to the valve stem (23), the positioning pin (272) is located between the two locking screws (271), and a handle (273) is threadedly connected to the valve stem (23).