CN212536794U

CN212536794U - Minimum pressure valve for air compressor

Info

Publication number: CN212536794U
Application number: CN202022142554.9U
Authority: CN
Inventors: 林武; 邱伟; 张亮亮; 熊春梅; 詹雷军
Original assignee: Ningbo Binwei Energy Equipment Co ltd
Current assignee: Ningbo Binwei Energy Equipment Co ltd
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-02-12
Anticipated expiration: 2030-09-25

Abstract

The utility model relates to the technical field of valves, in particular to a minimum pressure valve for an air compressor, which comprises a valve body and a valve core; the valve core is in threaded connection with the valve body and is positioned in the valve body; the valve body comprises a first pipeline and a second pipeline; the included angle a between the central lines of the first pipeline and the second pipeline is less than 70 degrees; the first pipeline is communicated with the inner cavity of the second pipeline; an annular step is arranged on the inner wall of the first pipeline; the annular step and the second pipeline are coaxial; the valve core is positioned in the second pipeline and is connected with the upper port of the second pipeline through threads. By adopting a novel runner way, the pressure loss of the runner is reduced, and the fluid noise is effectively reduced. The flow channel which is formed by the lower inlet and the upper outlet is more favorable for the layout of the internal pipeline of the air compressor. With the arrangement, the pilot valve can be closed more quickly, and gas backflow is prevented.

Description

Minimum pressure valve for air compressor

Technical Field

The invention relates to the technical field of valves, in particular to a minimum pressure valve for an air compressor.

Background

The minimum pressure is an important part in an air path system of an air compressor and has two main functions: 1. When the air compressor is just started, the minimum pressure valve is closed and is in a closed state, so that the internal circulation pressure of lubricating oil of the air compressor is established. 2. When the air compressor stops working, the pilot valve of the minimum pressure valve is closed to prevent the back-end compressed air from flowing back.

In a conventional minimum pressure valve, compressed gas needs to change the flow direction of the gas when passing through a valve core and reaches an exhaust port, and a significant throttling is formed in the area, so that not only is the fluid pressure loss caused, but also buzzing is easily generated.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to solve the problems that the minimum pressure valve in the prior art not only causes fluid pressure loss when compressed gas changes the flow direction, but also easily generates buzzing sound, and provides the minimum pressure valve for the air compressor.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A minimum pressure valve for an air compressor comprises a valve body and a valve core; the valve core is in threaded connection with the valve body and is positioned in the valve body; the valve body comprises a first pipeline and a second pipeline; the included angle a between the central lines of the first pipeline and the second pipeline is less than 70 degrees; the first pipeline is communicated with the inner cavity of the second pipeline; an annular step is arranged on the inner wall of the first pipeline; the annular step and the second pipeline are coaxial; the valve core is positioned in the second pipeline and is connected with the upper port of the second pipeline through threads.

Preferably, the valve core comprises a valve body end cover, a piston, a pilot valve, a pressure maintaining spring, a return spring and a pressure regulating nut; a piston cavity is arranged in the end cover of the valve body; the valve body end cover is connected to the inner side of the second pipeline through threads; the piston is positioned in a piston cavity of the end cover of the valve body and can move up and down; the pressure maintaining spring is positioned in the piston cavity, one end of the pressure maintaining spring is propped against the inner wall of the end cover of the valve body, and the other end of the pressure maintaining spring is propped against the end face of the piston positioned in the piston cavity; the pilot valve is positioned at the lower end of the piston and connected to one end of the piston positioned outside the piston cavity, and the outer side of the end face of the pilot valve is in contact with the surface of the annular step; the return spring is positioned between the pilot valve and the piston; the pressure regulating nut is connected to the uppermost end of the valve body end cover through threads.

Preferably, a snap spring is installed at a position close to the upper end inside the valve body end cover.

Preferably, a sealing gasket is arranged outside the lower end surface of the pilot valve, which is in contact with the surface of the annular step.

Preferably, the gasket is a rubber gasket.

Preferably, a sealing ring is installed on the inner side of the valve body end cover close to the lower end.

Preferably, the sealing ring is an O-ring.

Preferably, the upper end of the piston is provided with a spring groove, and the lower end of the piston is provided with a pilot valve accommodating cavity; the lower end of the pressure maintaining spring is positioned in the spring groove; the upper end of the pilot valve is positioned in the pilot valve containing cavity and can move up and down.

Preferably, the upper part of the first pipeline is an air inlet A, and the lower part of the first pipeline is an air outlet B.

Preferably, the angle a between the centre lines of the first and second conduits is 45 °.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

a valve body comprises a first pipeline and a second pipeline, the central axes of the first pipeline and the second pipeline form an included angle of 0-70 degrees, and a novel flow channel mode is adopted, so that the pressure loss of the flow channel is reduced, and the fluid noise is effectively reduced. The flow channel which is formed by the lower inlet and the upper outlet is more favorable for the layout of the internal pipeline of the air compressor. With the arrangement, the pilot valve can be closed more quickly, and gas backflow is prevented.

Two, at compressor stop work, minimum pressure valve pilot valve can close rapidly to prevent the gaseous backward flow of minimum pressure valve rear end in back, traditional minimum pressure valve relatively, in this scheme, the pilot valve is except receiving the elasticity of spring, but also receives backflow gas's pressure, compares the valve body can more quick closing with prior art.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a partial cross-sectional view of the valve body of the present invention;

FIG. 3 is a schematic view of the valve cartridge of the present invention in an open condition;

FIG. 4 is a schematic view of the valve cartridge of the present invention in a closed condition;

FIG. 5 is a schematic view of the working state of the present invention;

FIG. 6 is a schematic diagram of a prior art configuration;

FIG. 7 is a schematic diagram of the operation of the prior art;

in the figure, 1, a valve body; 11. a first conduit, 12, a second conduit;

2. a valve core; 21. the valve comprises a valve body end cover, 211, a piston cavity, 212, a clamp spring, 213, a sealing ring, 22, a piston, 221, a spring fixing groove, 222, a pilot valve accommodating cavity, 23, a pilot valve, 231, a sealing gasket, 24, a pressure maintaining spring, 25, a return spring, 26 and a pressure regulating nut;

3. an oil-gas separator;

4. a cooler;

5. a minimum pressure valve;

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

As shown in fig. 1 to 7, a minimum pressure valve for an air compressor includes a valve body 1 and a valve spool 2. The valve core 2 is connected with the valve body 1 through threads, the valve core 2 is positioned in the valve body 1, and the upper end part of the valve core 2 is positioned outside the valve body 1. The valve body 1 comprises a first duct 11 and a second duct 12. The included angle a between the central lines of the first pipeline 11 and the second pipeline 12 is smaller than 70 degrees, and the optimal included angle in the scheme is 45 degrees. The first pipe 11 is communicated with the inner cavity of the second pipe 12. Wherein the upper port of the first pipeline 11 is an air inlet a, and the lower port is an air outlet B. An annular step 111 is arranged on the inner wall of the middle part of the first pipeline 11, which is crossed with the second pipeline 12, the annular step 111 and the second pipeline 12 are coaxial, and the valve core 2 is positioned in the second pipeline 12 and is connected with the upper port of the second pipeline 12 through threads.

Specifically, the valve spool 2 includes a valve body end cover 21, a piston 22, a pilot valve 23, a pressure holding spring 24, a return spring 25, and a pressure regulating nut 26. Valve body end cover 21 passes through threaded connection and is equipped with piston cavity 211 in valve body end cover 21 inside at second pipeline 12 inboard, and threaded connection adjusting nut 26 is passed through to valve body end cover 21's upper end and seals valve body end cover 21 upper end, and adjusting nut 26 is located the terminal surface outside of second pipeline 12, and the lower extreme communicates with second pipeline 12, and piston 22 is located valve body end cover 21's piston cavity 211, can reciprocate moreover. The pressure maintaining spring 24 is located in the piston cavity 211, one end of the pressure maintaining spring is abutted against the inner wall of the pressure regulating nut 25, and the other end of the pressure maintaining spring is abutted against the inner end face of the piston 22 located in the piston cavity 211. The piston 22 may be reversely rebounded by the elastic force of the spring while the piston 22 moves. The pilot valve 23 is located at the lower end of the piston 22, and is connected to one end of the piston 22 located outside the piston cavity 211, when the valve core 2 is closed, the outer side of the end surface of the pilot valve 23 contacts with the surface of the annular step 111, and the return spring 25 is located between the pilot valve 23 and the piston 22.

Specifically, a snap spring 212 is mounted on the inner side of the valve body end cover 21 near the upper end, and when the minimum pressure valve is opened, the piston moves to the upper right to play a limiting role.

Specifically, a rubber gasket 231 is arranged outside the lower end surface of the pilot valve 23, which is in contact with the surface of the annular step 111, and the pilot valve 23 is pressed on the surface of the annular step 111 by the elastic force of the pressure maintaining spring 24 in a static state, so that the rubber gasket 231 forms a squeezing seal under the action of the pressure.

Specifically, an O-ring 213 is mounted on the inner side of the valve body end cover 21 near the lower end, and the inner side of the O-ring 213 contacts with the circumference of the piston 22 to form a compression seal.

Specifically, a spring groove 221 is formed in the upper end of the piston 22, a pilot valve accommodating cavity 222 is formed in the lower end of the piston 22, the lower end of the pressure maintaining spring 24 is located in the spring groove 221, and the upper end of the pilot valve 23 is located in the pilot valve accommodating cavity 222 and can move up and down.

In the initial state, the lower end of the pilot valve 23 is closed with the annular step 111 by the pressure retaining spring 24, so that the first pipe 11 is closed.

When the compressor stops working, the pilot valve 23 of the minimum pressure valve can be closed quickly, and gas backflow at the rear end of the minimum pressure valve is prevented. The pilot valve 23 is more rapidly closed by the elastic force F1 of the spring and the pressure F2 of the gas backflow. The problem of fluid pressure loss among the prior art has been solved effectively, the easy buzzing that produces moreover.

The foregoing is only a preferred embodiment of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims

1. The minimum pressure valve for the air compressor is characterized by comprising a valve body (1) and a valve core (2);

the valve core (2) is in threaded connection with the valve body (1), and the valve core (2) is positioned in the valve body (1);

the valve body (1) comprises a first duct (11) and a second duct (12);

the included angle a between the central lines of the first pipeline (11) and the second pipeline (12) is less than 70 degrees;

the inner cavity of the first pipeline (11) is communicated with the inner cavity of the second pipeline (12);

an annular step (111) is arranged on the inner wall of the first pipeline (11);

the annular step (111) and the second pipeline (12) are coaxial;

the valve core (2) is positioned in the second pipeline (12) and is connected with the upper port of the second pipeline (12) through threads.

2. The minimum pressure valve for an air compressor according to claim 1, wherein the valve core (2) comprises a valve body end cover (21), a piston (22), a pilot valve (23), a pressure maintaining spring (24), a return spring (25) and a pressure regulating nut (26);

a piston cavity (211) is arranged in the valve body end cover (21);

the valve body end cover (21) is connected to the inner side of the second pipeline (12) through threads;

the piston (22) is positioned in a piston cavity (211) of the valve body end cover (21) and can move up and down;

the pressure maintaining spring (24) is positioned in the piston cavity (211), one end of the pressure maintaining spring is abutted against the inner wall of the valve body end cover (21), and the other end of the pressure maintaining spring is abutted against the inner end face, positioned in the piston cavity (211), of the piston (22);

the pilot valve (23) is positioned at the lower end of the piston (22) and connected to one end, positioned outside the piston cavity (211), of the piston (22), and the outer side of the end face of the pilot valve (23) is in contact with the surface of the annular step (111);

the return spring (25) is positioned between the pilot valve (23) and the piston (22);

the pressure regulating nut (26) is connected to the uppermost end of the valve body end cover (21) through threads.

3. The minimum pressure valve for an air compressor as claimed in claim 2, wherein a snap spring (212) is mounted inside the valve body end cover (21) near the upper end.

4. The minimum pressure valve for an air compressor as claimed in claim 2, wherein a sealing gasket (231) is provided outside a lower end surface of the pilot valve (23) which is in surface contact with the annular step (111).

5. Minimum pressure valve for an air compressor according to claim 4, characterized in that the gasket (231) is a rubber gasket.

6. A minimum pressure valve for an air compressor according to claim 2, wherein a seal ring (213) is installed inside the valve body end cover (21) near the lower end.

7. Minimum pressure valve for an air compressor according to claim 6, characterized in that the sealing ring (213) is an O-ring.

8. The minimum pressure valve for an air compressor as claimed in claim 2, wherein the piston (22) is provided at an upper end thereof with a spring groove (221), and the piston (22) is provided at a lower end thereof with a pilot valve accommodating chamber (222);

the lower end of the pressure maintaining spring (24) is positioned in the spring groove (221);

the upper end of the pilot valve (23) is positioned in the pilot valve accommodating cavity (222) and can move up and down.

9. The minimum pressure valve for an air compressor as claimed in claim 1, wherein the upper portion of the first pipe (11) is an air inlet a, and the lower portion of the first pipe (11) is an air outlet B.

10. -minimum pressure valve for an air compressor according to claim 1, characterised in that the angle a between the centre lines of the first duct (11) and the second duct (12) is 45 °.