Micro-flow back pressure valve

Abstract

The utility model relates to a micro-flow back pressure valve which comprises a valve body and an upper cover, the upper cover is fixed on the valve body, the valve body is provided with an inlet and an outlet, and the inlet is provided with a plurality of air inlet holes; a spring is arranged in the upper cover, a spring seat is arranged at the end, close to the valve body, of the spring, a valve seat assembly is arranged below the spring seat and comprises a supporting seat, grooves are symmetrically formed in the left side and the right side of the supporting seat, and first sealing rings are arranged in the grooves. An inner hole is formed in the supporting base, and the hole diameter of the inner hole is matched with the flow at the outlet. According to the back pressure valve, the flow can be finely adjusted, and the flow control performance of the back pressure valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a small flow back pressure valve. Background Art

[0002] The term back pressure valve comes from Back Pressure Valve. It means that a certain pressure is formed due to the function of the valve, and the pressure can generally be adjusted. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The opening and closing part is a disc-shaped valve plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or regulation. It mainly plays the role of cutting off and throttling on the pipeline. The most commonly used systems are fluid metering and dosing systems, hydraulic control systems, chemical reaction conditions, physical critical state control, etc.

[0003] Currently, flow control of back-pressure valves is a key indicator for improving back-pressure valve performance. However, in scenarios where a small flow rate is required, such as chemical reactions, existing back-pressure valves are difficult to meet the flow requirements. Utility Model Content

[0004] The utility model aims to provide a small flow back pressure valve to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a small flow back pressure valve, comprising a valve body and an upper cover, the upper cover is fixed on the valve body, the valve body is provided with an inlet and an outlet, and the inlet is provided with a plurality of air inlet holes;

[0006] A spring is arranged in the upper cover, and a spring seat is arranged at one end of the spring near the valve body, and a valve seat assembly is arranged below the spring seat, and the valve seat assembly includes a support seat, and grooves are symmetrically arranged on the left and right sides of the support seat, and a first sealing ring is arranged in the groove;

[0007] The support seat is provided with an inner hole, and the diameter of the inner hole matches the flow rate at the outlet.

[0008] Optionally, a buffer pad is provided between the support seat and the spring seat.

[0009] Optionally, a diaphragm is provided between the support seat and the buffer pad, and a second sealing ring is provided between two ends of the diaphragm and the upper cover.

[0010] Optionally, an end of the spring away from the spring seat is connected to an adjusting rod.

[0011] Optionally, a lock nut is sleeved on the outer periphery of the adjusting rod.

[0012] Optionally, the size of the buffer pad is the same as that of the spring seat, and the size of the diaphragm is larger than that of the buffer pad.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model can change the inner hole diameter of the support seat and the number of air holes opened and closed at the inlet according to different working conditions, thereby achieving micro-adjustment of the flow rate and improving the flow control performance of the back pressure valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the valve seat assembly. DETAILED DESCRIPTION

[0017] 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.

[0018] like Figure 1 and Figure 2 As shown, a small flow back pressure valve comprises a valve body 10 and an upper cover 3, wherein the upper cover 3 is fixed on the valve body 10, and an inlet A and an outlet B are provided on the valve body 10, and a plurality of air inlet holes are provided on the inlet A; a spring 4 is provided inside the upper cover 3, and a spring seat 5 is provided at one end of the spring 4 near the valve body 10, and a valve seat assembly 9 is provided below the spring seat 5, and the valve seat assembly 9 comprises a support seat 901, and grooves 903 are symmetrically provided on the left and right sides of the support seat 901, and a first sealing ring 902 is provided in the groove 903; an inner hole 9011 is provided on the support seat 901, and the aperture of the inner hole 9011 matches the flow at the outlet B.

[0019] In order to achieve precise flow regulation, the utility model divides the back pressure valve into two parts, a valve body 10 and an upper cover 3, and a valve seat assembly 9 is arranged between the spring 4 and the valve body 10. Through the close fit between the support seat 901 and the spring seat 5, the resistance of the spring 4 to contraction and lifting becomes larger.

[0020] A plurality of air inlet holes are provided on the inlet A of the valve body 10. When the flow rate is small, air can be admitted through only one air inlet hole. When the flow rate increases, air can be admitted through a plurality of air inlet holes at the same time, so that the back pressure valve of the present application can adapt to the use scenario with a wide flow range. Among them, the opening and closing of the air inlet hole can be controlled by blocking such as a shielding sheet. The inner hole 9011 on the support seat 901 can be replaced according to different flow rates. When a large flow rate is required, a support seat with a large-diameter inner hole is replaced. When a small flow rate is required, a support seat with a small-diameter inner hole is replaced. By using inner holes of different apertures, a slight change in the flow rate at the outlet B can be achieved.

[0021] In order to reduce the impact of the spring 4 on the support seat 901 when it is relaxed, a buffer pad 6 is provided between the support seat 901 and the spring seat 5. A diaphragm 7 is provided between the support seat 901 and the buffer pad 6, and a second sealing ring 8 is provided between the two ends of the diaphragm 7 and the upper cover 3. The second sealing ring 8 prevents a gap between the diaphragm 7 and the buffer pad 6 when the back pressure valve is working, thereby facilitating the control of a small variable flow rate. The size of the buffer pad 6 is the same as that of the spring seat 5, and the size of the diaphragm 7 is larger than that of the buffer pad 6.

[0022] An adjusting rod 1 is connected to one end of the spring away from the spring seat 5, and a lock nut 2 is sleeved on the outer periphery of the adjusting rod 1. The adjusting rod 1 is used to adjust the tightness of the spring, thereby realizing the control of the flow of the back pressure valve.

[0023] 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 small flow back pressure valve, characterized in that: It comprises a valve body (10) and an upper cover (3), wherein the upper cover (3) is fixed on the valve body (10), an inlet (A) and an outlet (B) are provided on the valve body (10), and a plurality of air inlet holes are provided on the inlet (A); A spring (4) is provided in the upper cover (3); a spring seat (5) is provided at one end of the spring (4) close to the valve body (10); and a valve seat assembly (9) is provided below the spring seat (5); The valve seat assembly (9) comprises a support seat (901), and grooves (903) are symmetrically arranged on the left and right sides of the support seat (901), and a first sealing ring (902) is arranged in the groove (903); The support seat (901) is provided with an inner hole (9011), and the diameter of the inner hole (9011) matches the flow rate at the outlet (B).

2. A small flow back pressure valve according to claim 1, characterized in that: A buffer pad (6) is provided between the support seat (901) and the spring seat (5).

3. A small flow back pressure valve according to claim 2, characterized in that: A diaphragm (7) is provided between the support seat (901) and the buffer pad (6), and a second sealing ring (8) is provided between the two ends of the diaphragm (7) and the upper cover (3).

4. A small flow back pressure valve according to claim 1, characterized in that: One end of the spring (4) away from the spring seat (5) is connected to an adjustment rod (1).

5. A small flow back pressure valve according to claim 4, characterized in that: A lock nut (2) is sleeved on the outer circumference of the adjusting rod (1).

6. A small flow back pressure valve according to claim 3, characterized in that The size of the buffer pad (6) is the same as the size of the spring seat (5), and the size of the diaphragm (7) is larger than the size of the buffer pad (6).

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