CN212868607U

CN212868607U - Pressure charging type minimum pressure valve

Info

Publication number: CN212868607U
Application number: CN202021818823.2U
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: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-04-02
Anticipated expiration: 2030-08-26

Abstract

The utility model relates to the technical field of valves, in particular to a pressurizing type minimum pressure valve, which comprises a valve body, a piston, a sealing plug and a pilot valve; an accommodating cavity is arranged in the valve body, and the piston and the pilot valve are positioned in the accommodating cavity of the valve body; the sealing plug is positioned in the valve body accommodating cavity and positioned at the upper end of the valve body; a back pressure cavity is formed between the piston and the sealing plug; one end of the pilot valve is positioned in the piston, and the other end of the pilot valve is positioned at the lower part of the piston; a through hole is formed in the sealing plug, and a one-way valve is connected in the through hole through threads; an inflation inlet is arranged on the upper end surface of the sealing plug; the inflation inlet is communicated with the through hole; the back pressure cavity is communicated with the inflation inlet through a one-way valve. The mode of pre-charging compressed air inside is adopted, a return spring in a back pressure cavity in the prior art is eliminated, and potential safety hazards are avoided. Meanwhile, a one-way air inlet is formed in the position of the sealing plug, and the control mode of the air compressor is increased.

Description

Pressure charging type minimum pressure valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a pressurization formula minimum pressure valve.

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 the traditional minimum pressure valve, after the reset spring is used for many times, the spring fatigue causes the spring elasticity to be reduced, the opening pressure of the minimum pressure valve is influenced, the minimum pressure valve cannot normally work, and potential safety hazards are caused.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

The utility model discloses the purpose is to the reset spring among the prior art among the minimum pressure valve after using many times, and the elasticity of spring descends, leads to minimum pressure valve can not normally work, provides a pressure filling formula minimum pressure valve.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

A pressurizing type minimum pressure valve comprises a valve body, a piston, a sealing plug and a pilot valve; an accommodating cavity is arranged in the valve body, and the piston and the pilot valve are positioned in the accommodating cavity of the valve body; the sealing plug is positioned in the valve body accommodating cavity and positioned at the upper end of the valve body; a back pressure cavity is formed between the piston and the sealing plug; one end of the pilot valve is positioned in the piston, and the other end of the pilot valve is positioned at the lower part of the piston; a through hole is formed in the sealing plug, and a one-way valve is connected in the through hole through threads; an inflation inlet is arranged on the upper end surface of the sealing plug; the inflation inlet is communicated with the through hole; the back pressure cavity is communicated with the inflation inlet through a one-way valve.

Preferably, the pilot valve comprises a first connection end and a second connection end; the second connecting end is located the holding chamber of piston, is connected with compression spring between second connecting end tip and the piston.

Preferably, the first connecting end is attached to the lower end face of the piston, and a constant pressure hole for communicating the piston accommodating cavity with the exhaust port C is formed in the outer side of the circumference of the first connecting end.

Preferably, a sealing gasket is arranged at the lower end of the first connection end of the pilot valve.

Preferably, a sealing ring is arranged in the valve body, and the inner wall of the sealing ring is attached to the outer side of the circumference of the piston.

Preferably, the one-way valve comprises a one-way valve plug, a return spring and a steel ball; the check valve plug is connected with the through hole in the sealing plug through threads; the steel ball is positioned at a connecting port of the through hole and the inflation inlet to seal the through hole and the inflation inlet; the return spring is positioned between the steel ball and the check valve plug.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a fill pressure formula minimum pressure valve, through set up the through-hole with back pressure chamber and inflation hole intercommunication on sealed plug, through threaded connection have can only follow the inflation hole to the aerify check valve in the through-hole in back pressure chamber, through aerifing the back pressure intracavity, drive piston back and forth movement through pressure difference, replaced reset spring among the prior art after frequent action many times, make reset spring tired, can not normally work, influence the internal circulating pressure of air compressor lubricating oil.

And secondly, a sealing ring is arranged on the valve body, so that when the piston moves in the valve body, the gas sealing in the back pressure cavity can be ensured.

And thirdly, by adopting a mode of pre-charging compressed air inside, a return spring in a back pressure cavity in the prior art is cancelled, and potential safety hazards are avoided. Meanwhile, a one-way air inlet is formed in the position of the sealing plug, and the control mode of the air compressor (an external access control air path element) is increased. The improvement method is partially improved on the prior art, is applicable to the minimum pressure valve of accessories such as a valve body, a pilot valve and the like in the prior art, and reduces the improvement cost.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of a prior art configuration;

in the figure, 1, a valve body; 11. a back pressure chamber 12, a sealing ring;

2. a piston;

3. sealing the plug; 31. the device comprises a through hole, 32, an inflation inlet, 33, a one-way valve, 331, a one-way valve plug, 332, a return spring, 333 and a steel ball;

4. a pilot valve; 41. the first connecting end 41a, the sealing gasket 42, the second connecting end 43 and the compression spring;

5. a return spring.

Detailed Description

The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the utility model is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the present 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 belong to the protection scope of the utility model.

As shown in fig. 1, a pressurized minimum pressure valve includes a valve body 1, a piston 2, a sealing plug 3, and a pilot valve 4. The piston 2 is positioned in the valve body 1, the air inlet cavity A and the back pressure cavity B are respectively positioned on two sides of the piston 2, and the back pressure cavity B is formed between the piston 2 and the sealing plug 3. The port of the exhaust port C is positioned in the middle of the air inlet cavity A and the back pressure cavity B of the valve body 1, and the exhaust port C can be communicated with the containing cavity of the piston 2 through a constant pressure hole of the pilot valve 4. An accommodating cavity is arranged in the valve body 1, and the piston 2 and the pilot valve 4 are positioned in the accommodating cavity of the valve body 1. The sealing plug 3 is positioned in the accommodating cavity of the valve body 1 and positioned at one end of the valve body 1.

Specifically, the pilot valve 21 has one end located inside the piston 2 and the other end located outside the piston 2. The pilot valve 4 comprises a first connecting end 41 and a second connecting end 42, the second connecting end 42 is located in the accommodating cavity of the piston 2, and a compression spring 43 is connected between the end of the second connecting end 42 and the piston 2. The pilot valve 4 can be moved up and down in the accommodation chamber of the piston 2 by compressing the return spring 43. The end face of the first connecting end 41 of the pilot valve 4 is provided with a sealing gasket 41a, so that the sealing gasket 41a can be sealed when being attached to the inner wall of the valve body 1, and gas in the gas inlet cavity A and the gas outlet C can be prevented from mutually permeating.

Specifically, a through hole 31 is formed in the sealing plug 3, and a check valve 33 is connected to the through hole 31 through a screw. An inflation inlet 32 is arranged on the upper end face of the sealing plug 3, the inflation inlet 32 is communicated with the through hole 31, the back pressure cavity 11 is communicated with the inflation inlet 32 through a one-way valve 33, and the air can only flow into the back pressure cavity 11 through the inflation inlet 32.

Specifically, the check valve 33 includes a check valve plug 331, a return spring 332, and a steel ball 333. The check valve plug 331 is connected with the through hole 31 of the sealing plug 3 through threads, sealant can be coated on the threads to increase the sealing effect, the steel ball 333 is located at a connecting port of the through hole 31 and the inflation inlet 32, the return spring 332 is located between the steel ball 333 and the check valve plug 331, the steel ball 333 is abutted against the connecting position of the through hole 31 and the inflation inlet 32 under the action of the return spring 332, the through hole 31 and the inflation inlet 32 are sealed, but when pressure is applied to the back pressure cavity B from the inflation inlet 33, the steel ball 333 can be pushed inwards, the check valve 33 can be opened, and the back pressure cavity B is inflated.

When the air inlet valve is used, when compressed air in the air inlet cavity A reaches a certain pressure, pressure is further applied, the piston 2 compresses the compressed air in the back pressure cavity B, the pilot valve 4 is pushed to move towards the piston 2 under the action of the pressure to drive the piston 2 to move upwards together, the air inlet A is communicated with the air outlet C, when the air inlet A is required to be disconnected with the air outlet C, the air is filled into the back pressure cavity B through the air filling port 32 and the one-way valve 33, the pressure in the back pressure cavity B is increased, the piston 2 is pushed downwards, and the air inlet A is disconnected with the air outlet C.

The above description is only the preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; according to the technical scheme of the utility model and the improvement conception, equivalent substitution or change is carried out; are all covered by the protection scope of the utility model.

Claims

1. A pressurizing type minimum pressure valve is characterized by comprising a valve body (1), a piston (2), a sealing plug (3) and a pilot valve (4);

an accommodating cavity is formed in the valve body (1), and the piston (2) and the pilot valve (4) are positioned in the accommodating cavity of the valve body (1);

the sealing plug (3) is positioned in the accommodating cavity of the valve body (1) and is positioned at the upper end of the valve body (1);

a back pressure cavity (11) is formed between the piston (2) and the sealing plug (3);

one end of the pilot valve (4) is positioned in the piston (2), and the other end is positioned at the lower part of the piston (2);

a through hole (31) is arranged in the sealing plug (3), and a one-way valve (33) is connected in the through hole (31) through threads;

an inflation inlet (32) is arranged on the upper end surface of the sealing plug (3);

the inflation inlet (32) is communicated with the through hole (31);

the back pressure cavity (11) is communicated with the inflation port (32) through a one-way valve (33).

2. The pressurized minimum pressure valve according to claim 1, wherein the pilot valve (4) comprises a first connection end (41) and a second connection end (42);

the second connecting end (42) is positioned in the accommodating cavity of the piston (2), and a compression spring (43) is connected between the end part of the second connecting end (42) and the piston (2).

3. The minimum pressure charging valve as claimed in claim 2, wherein the first connecting end (41) is engaged with the lower end surface of the piston (2), and a constant pressure hole for communicating the receiving chamber of the piston (2) with the exhaust port C is formed at the outer circumferential side of the first connecting end (41).

4. The minimum pressure charging valve as claimed in claim 2, wherein the pilot valve (4) is provided with a sealing gasket (41 a) at the lower end of the first connection end (41).

5. The minimum pressure charging valve as claimed in claim 1, wherein a sealing ring (12) is arranged in the valve body (1), and the inner wall of the sealing ring (12) is attached to the outer circumference of the piston (2).

6. The pressurized minimum pressure valve according to claim 1, wherein the check valve (33) comprises a check valve plug (331), a return spring (332) and a steel ball (333);

the check valve plug (331) is connected with the through hole (31) in the sealing plug (3) through threads;

the steel ball (333) is positioned at a connecting port of the through hole (31) and the inflation inlet (32) to seal the through hole (31) and the inflation inlet (32);

and the return spring (332) is positioned between the steel ball (333) and the check valve plug (331).