CN110630792A

CN110630792A - Gas regulator

Info

Publication number: CN110630792A
Application number: CN201910808666.2A
Authority: CN
Inventors: 林建州; 曾素珍
Original assignee: Nanjing Vtech Electro-Mechanical Technology Development Co Ltd
Current assignee: Nanjing Weiyida Instrument Technology Co ltd
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2019-12-31
Anticipated expiration: 2039-08-29
Also published as: CN110630792B

Abstract

The invention discloses a gas regulator, which comprises a body with a valve chamber, a piston group arranged in the body and a pressure regulating mechanism which acts with the piston group and is positioned outside the body. The gas regulator has the advantages of stable output gas, simple structure, easy assembly and disassembly, good sealing effect after long-time use, easy damage of the sealing ring in use and low use cost.

Description

Gas regulator

Technical Field

The present invention relates to a pressure regulator, and more particularly, to a gas regulator.

Background

In the fields of industry, medical treatment, scientific research and the like, a gas pressure reducing and regulating valve is generally needed to regulate gas stored in a high-pressure gas cylinder into stable low-pressure gas for use.

Unstable gas in the existing high-pressure gas cylinder directly enters a pressure regulating piston in a gas pressure reducing valve for pressure reduction, and the gas after pressure reduction is directly discharged through a gas outlet on a valve body. And because the gas in the high-pressure gas cylinder, pressure is big and unstable, and the pressure adjusting piston that directly gets into in the gas relief valve can cause very big impact to the pressure adjusting piston to influence the precision of pressure adjusting piston, can't satisfy the requirement that pressure accuracy requires much more and stable output ration pressure.

Disclosure of Invention

The invention aims to solve the technical problems that in the prior art, unstable gas in a high-pressure gas cylinder directly enters a pressure regulating piston in a gas pressure reducing valve to reduce the pressure, and the reduced gas is directly discharged through a gas outlet on a valve body. And because the gas in the high-pressure gas cylinder, pressure is big and unstable, and the pressure adjusting piston that directly gets into in the gas relief valve can cause very big impact to the pressure adjusting piston to influence the precision of pressure adjusting piston, can't satisfy the technical problem that the pressure accuracy requires higher and stabilize the requirement of output ration pressure.

In order to solve the technical problem, the technical scheme adopted by the invention is as follows:

a gas regulator comprises a body with a valve chamber, a piston group arranged in the body and a pressure regulating mechanism which acts with the piston group and is positioned outside the body,

the body is provided with a gas inlet and a gas outlet, the gas inlet is communicated with the lower part of the valve chamber, the gas outlet is communicated with the upper part of the valve chamber, and the piston group is arranged in the valve chamber;

the piston group comprises a spring seat, a high-pressure valve base, a high-pressure spring, a high-pressure valve shaft, a nozzle gasket, a nozzle, a plunger, a pressure release valve piston and a pressing block,

the high-pressure valve shaft consists of a first shaft section, a conical frustum section, a cylindrical section and a second shaft section, wherein the first shaft section, the conical frustum section, the cylindrical section and the second shaft section are sequentially connected, and the large end of the conical frustum section is connected with the cylindrical section; a ball is arranged at the end part of the free end of the first shaft section;

the nozzle is provided with a pressure relief channel, and the first shaft section of the high-pressure valve shaft is inserted into the pressure relief channel of the nozzle and protrudes out of the upper end surface of the nozzle;

the nozzle gasket is embedded into a gasket groove arranged on the lower end face of the nozzle, and the nozzle gasket is contacted with the small end of the frustum section;

the high-pressure valve base is provided with a central hole which is penetrated by the second shaft section of the high-pressure valve shaft, and the outer surface of the lower part of the high-pressure valve base is provided with a conical surface;

the spring seat is axially provided with a spring seat axial through hole, and the second shaft section of the high-pressure valve shaft penetrates through the central hole of the high-pressure valve base and extends into the spring seat axial through hole;

the high-pressure spring is sleeved on the second shaft section of the high-pressure valve shaft, one end of the high-pressure spring props against the end face of the cylindrical section, and the other end of the high-pressure spring props against the upper end face of the high-pressure valve base; the conical surface at the lower part of the high-pressure valve base is inserted into a conical hole which is arranged in the concave way on the upper end surface of the spring seat;

the high-pressure valve shaft, the high-pressure spring, the high-pressure valve base and the spring seat are assembled at the lower part of the valve chamber by the nozzle;

the plunger is arranged in the pressure relief valve piston, the ball body on the high-pressure valve shaft props against the plunger, the pressure relief valve piston is arranged in the pressure block, the pressure block is arranged in the valve chamber, and the pressure regulating mechanism presses the pressure block on the upper part of the valve chamber; the plunger is provided with a pressure relief through hole along the axial direction, and the ball on the high-pressure valve shaft contacts the pressure relief through hole of the plunger; the pressure relief valve piston is provided with a pressure relief valve piston air passage along the axial direction, and the pressure relief valve piston air passage is coaxial with the pressure relief through hole;

the pressure regulating mechanism comprises a lower spring fulcrum, a low-pressure spring, a plane bearing, an upper spring fulcrum, an upper cover, a pressure regulating bolt and a regulating torsion handle,

the lower spring fulcrum shaft, the low-pressure spring, the plane bearing and the upper spring fulcrum shaft are all placed in the upper cover, the upper cover is in threaded connection with the body, the lower spring fulcrum shaft contacts the top of the piston of the pressure relief valve, the upper spring fulcrum shaft is installed on a pressure regulating bolt through an upper spring fulcrum shaft fastening screw, and the pressure regulating bolt is in threaded connection with the upper cover; the plane bearing is sleeved on the upper spring fulcrum, gaskets are sleeved at the upper end and the lower end of the upper spring fulcrum, the low-pressure spring is arranged between the lower spring fulcrum and the upper spring fulcrum, one end of the low-pressure spring props against the lower spring fulcrum, and the other end of the low-pressure spring props against the gaskets on the upper spring fulcrum; the adjusting twist handle covers the outer part of the upper cover and is fixed on the pressure adjusting bolt through a twist handle fastening screw.

Preferably, a first O-shaped sealing ring is arranged between the plunger and the pressure relief valve piston, a second O-shaped sealing ring is arranged between the outer wall of the pressure relief valve piston and the inner wall of the pressing block, and a third O-shaped sealing ring is arranged between the lower end face of the pressing block and the body.

Preferably, the outer surface of the top of the piston of the pressure release valve is an arc surface, and the end surface of the lower spring fulcrum shaft is concavely provided with an arc groove matched with the arc surface of the top of the piston of the pressure release valve.

Preferably, the gas inlet is internally provided with a gas inlet connecting rod, the gas inlet connecting rod is in threaded connection with a gas inlet screw cap, and the inlet of the gas inlet connecting rod is provided with a filter screen. The filter screen is designed to effectively filter the gas entering the air and buffer the pressure, so that the filtering precision of the gas and the pressure precision after decompression are more stable.

Preferably, the body is provided with a high-pressure gauge which is communicated with the gas inlet.

Preferably, the gas outlet is internally provided with an outlet clamping sleeve, the outlet clamping sleeve is in threaded connection with a clamping sleeve nut, and the outlet clamping sleeve is internally provided with the gas outlet connecting rod through a clamping sleeve gasket and a clamping sleeve locking ring.

Preferably, the body is provided with a low-pressure gauge which is communicated with the gas outlet.

Compared with the prior art, the invention has the advantages that:

the gas regulator has stable output gas, simple structure, easy assembly and disassembly, good sealing effect after long-time use, easy damage of the sealing ring in use and low use cost.

Drawings

Fig. 1 is a sectional view of a pressure regulator.

Fig. 2 is an exploded view of a pressure regulator.

Fig. 3 is a block diagram of the high pressure valve shaft.

Fig. 4 is a sectional view showing the installation positions of the high pressure gauge and the low pressure gauge.

Fig. 5 is a schematic view of the piston assembly in the pressure regulator in the present embodiment in an initial state.

Fig. 6 is a schematic diagram of the pressure regulator according to the present embodiment in which the piston assembly is in the pressure regulation start state.

Fig. 7 is a schematic diagram of the pressure regulator according to the present embodiment, in which the piston assembly is in a pressure relief state.

Detailed Description

In order that the present invention may be more fully understood, reference is now made to the following description taken in conjunction with the accompanying drawings, which illustrate, by way of example, embodiments of the invention.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

as shown in fig. 1; the pressure regulator in this embodiment includes a body 1 having a valve chamber, a piston group provided in the body 1, and a pressure regulating mechanism that acts on the piston group and is located outside the body 1. The body 1 is provided with a gas inlet and a gas outlet, the gas inlet is communicated with the lower part of the valve chamber, the gas outlet is communicated with the upper part of the valve chamber, and the piston group is arranged in the valve chamber.

As shown in fig. 2, the piston assembly includes a spring seat 2, a high-pressure valve seat 3, a high-pressure spring 4, a high-pressure valve shaft 5, a nozzle gasket 6, a nozzle 7, a plunger 8, a relief valve piston 33, and a pressure block 11.

As shown in fig. 3, the high pressure valve shaft 5 is composed of a first shaft section 51, a frustum section 52, a cylindrical section 53 and a second shaft section 54, the first shaft section 51, the frustum section 52, the cylindrical section 53 and the second shaft section 54 are connected in sequence, and the large end of the frustum section 52 is connected with the cylindrical section 53; a ball 55 is provided at the free end of the first shaft section 51.

As shown in fig. 1 and 2, the nozzle 7 is provided with a relief passage 71, and the first shaft section 51 of the high-pressure valve shaft 5 is inserted into the relief passage 71 of the nozzle 7 and protrudes from the upper end surface of the nozzle 7. The nozzle gasket 6 is embedded into a gasket groove arranged on the lower end face of the nozzle 7, and the nozzle gasket 6 is contacted with the small end of the frustum section 52; the high-pressure valve base 3 is provided with a central hole for the second shaft section 54 of the high-pressure valve shaft 5 to penetrate through, and the outer surface of the lower part of the high-pressure valve base 3 is provided with a conical surface; the spring seat 2 is provided with a spring seat axial through hole along the axial direction, and the second shaft section 54 of the high-pressure valve shaft 5 penetrates through the central hole of the high-pressure valve base 3 and extends into the spring seat axial through hole; the high-pressure spring 4 is sleeved on the second shaft section 54 of the high-pressure valve shaft 5, one end of the high-pressure spring 4 is propped against the end surface of the cylindrical section 53, and the other end of the high-pressure spring 4 is propped against the upper end surface of the high-pressure valve base 3; the conical surface at the lower part of the high-pressure valve base 3 is inserted into the conical hole which is arranged inwards on the upper end surface of the spring seat 2.

The nozzle 7 assembles the high pressure valve shaft 5, the high pressure spring 4, the high pressure valve base 3 and the spring seat 2 at the lower part of the valve chamber.

As shown in fig. 1 and 2, the plunger 8 is arranged in the pressure relief valve piston 33, the ball 55 on the high-pressure valve shaft 5 abuts against the plunger 8, the pressure relief valve piston 33 is arranged in the pressure block 11, the pressure block 11 is arranged in the valve chamber, and the pressure regulating mechanism presses the pressure block 11 on the upper part of the valve chamber; the plunger 8 is provided with a pressure relief through hole along the axial direction, and the ball 55 on the high-pressure valve shaft 5 contacts the pressure relief through hole of the plunger 8; the pressure relief valve piston 33 is provided with a pressure relief valve piston air passage along the axial direction, and the pressure relief valve piston air passage is coaxial with the pressure relief through hole.

As shown in fig. 1 and 2, the pressure regulating mechanism includes a lower spring support shaft 12, a low-pressure spring 13, a flat bearing 15, an upper spring support shaft 17, an upper cover 19, a pressure regulating bolt 20, and a regulating knob 21.

The lower spring fulcrum 12, the low-pressure spring 13, the plane bearing 15 and the upper spring fulcrum 17 are all placed in the upper cover 19, the upper cover 19 is in threaded connection with the body 1, the lower spring fulcrum 12 contacts the top of the pressure relief valve piston 33, the outer surface of the top of the pressure relief valve piston 33 is an arc surface, and an arc-shaped groove matched with the arc surface of the top of the pressure relief valve piston 33 is concavely arranged on the end surface of the lower spring fulcrum 12. The spring fulcrum 17 is arranged on a pressure regulating bolt 20 through an upper spring fulcrum fastening screw 16, and the pressure regulating bolt 20 is in threaded connection with an upper cover 19; the plane bearing 15 is sleeved on the upper spring fulcrum 17, the gasket 14 is sleeved on both the upper end and the lower end of the upper spring fulcrum 17, the low-pressure spring 13 is arranged between the lower spring fulcrum 12 and the upper spring fulcrum 17, one end of the low-pressure spring 13 is propped against the lower spring fulcrum 12, and the other end is propped against the gasket 14 on the upper spring fulcrum 17; an adjusting twist handle 21 covers the outside of the upper part of the upper cover 19, and the adjusting twist handle 21 is fixed on the pressure adjusting bolt 20 through a twist handle fastening screw 22.

As shown in fig. 1, a first O-ring 9 is disposed between the plunger 8 and the pressure relief valve piston 33, a second O-ring 18 is disposed between the outer wall of the pressure relief valve piston 33 and the inner wall of the pressure block 11, and a third O-ring 10 is disposed between the lower end surface of the pressure block 11 and the body 1.

As shown in fig. 1, an inlet extension rod 24 is provided in the gas inlet, an inlet nut 25 is screwed to the inlet extension rod 24, and a strainer 26 is provided at the inlet of the inlet extension rod 24. The filter screen is designed to effectively filter the gas entering the air and buffer the pressure, so that the filtering precision of the gas and the pressure precision after decompression are more stable. As shown in fig. 4, a high pressure gauge 27 is provided on the body 1, and the high pressure gauge 27 is communicated with the gas inlet.

As shown in fig. 1, an outlet ferrule 29 is disposed in the gas outlet, a ferrule nut 32 is threadedly engaged with the outlet ferrule 29, and a gas outlet stem 34 is installed in the outlet ferrule 29 via a ferrule gasket 30 and a ferrule lock ring 31. As shown in fig. 4, a low pressure gauge 28 is provided on the body 1, and the low pressure gauge 28 communicates with the gas outlet.

As shown in fig. 5, 6 and 7, the pressure regulating process of the gas regulator of the present embodiment is as follows:

high-pressure gas enters the piston group through a gas inlet on the body 1 through a gas inlet connecting rod 24, during pressure regulation, a regulating torsion handle 21 in the pressure regulating mechanism is rotated, the regulating torsion handle 21 rotates and rotates together with a pressure regulating bolt 20, the pressure regulating bolt 20 presses a low-pressure spring 13 downwards, the low-pressure spring 13 pushes an upper spring support shaft 17, the upper spring support shaft 17 pushes a pressure relief valve piston 33 in the piston group to move downwards, the pressure relief valve piston 33 moves downwards to drive a plunger 8, the plunger 8 pushes a high-pressure valve shaft 5, a gap is formed between a conical table section 52 in the high-pressure valve shaft 5 and a nozzle gasket 6, the high-pressure gas is buffered through the gap to form low-pressure gas, and the low-pressure gas is discharged through a gas outlet.

When the output pressure is too high, the pressure is released; the specific operation is as follows: when the handle 21 is turned round, the gap of the thread pitch of the thread on the handle 21 drives the piston 33 of the pressure release valve to deviate, the spherical surface of the sphere 55 on the high-pressure valve shaft 5 is not in contact with the plunger 8 (when pressure is adjusted, the spherical surface of the sphere 55 on the high-pressure valve shaft 5 is in close contact with the plunger 8 due to a pressing-down state, leakage cannot occur from the spherical surface of the sphere 55), and gas is exhausted from the air leakage through hole reserved on the plunger 8, so that the danger caused by overhigh pressure in the using process is avoided.

The parts not involved in the present invention are the same as or implemented using the prior art.

The embodiments of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the content of the claims of the present invention should be regarded as the technical scope of the present invention.

Claims

1. A gas regulator comprises a body (1) with a valve chamber, a piston group arranged in the body (1) and a pressure regulating mechanism which acts with the piston group and is positioned outside the body (1),

the body (1) is provided with a gas inlet and a gas outlet, the gas inlet is communicated with the lower part of the valve chamber, the gas outlet is communicated with the upper part of the valve chamber, and the piston group is arranged in the valve chamber;

the piston group comprises a spring seat (2), a high-pressure valve base (3), a high-pressure spring (4), a high-pressure valve shaft (5), a nozzle gasket (6), a nozzle (7), a plunger (8), a pressure release valve piston (33) and a pressing block (11),

the high-pressure valve shaft (5) is composed of a first shaft section (51), a cone frustum section (52), a cylinder section (53) and a second shaft section (54), the first shaft section (51), the cone frustum section (52), the cylinder section (53) and the second shaft section (54) are sequentially connected, and the large end of the cone frustum section (52) is connected with the cylinder section (53); a ball (55) is arranged at the free end of the first shaft section (51);

the nozzle (7) is provided with a pressure relief channel (71), and the first shaft section (51) of the high-pressure valve shaft (5) is inserted into the pressure relief channel (71) of the nozzle (7) and protrudes out of the upper end surface of the nozzle (7);

the nozzle gasket (6) is embedded into a gasket groove arranged on the lower end face of the nozzle (7), and the nozzle gasket (6) is contacted with the small end of the frustum section (52);

the high-pressure valve base (3) is provided with a central hole for the second shaft section (54) of the high-pressure valve shaft (5) to penetrate through, and the outer surface of the lower part of the high-pressure valve base (3) is provided with a conical surface;

the spring seat (2) is axially provided with a spring seat axial through hole, and the second shaft section (54) of the high-pressure valve shaft (5) penetrates through the central hole of the high-pressure valve base (3) and extends into the spring seat axial through hole;

the high-pressure spring (4) is sleeved on the second shaft section (54) of the high-pressure valve shaft (5), one end of the high-pressure spring (4) is propped against the end face of the cylindrical section (53), and the other end of the high-pressure spring (4) is propped against the upper end face of the high-pressure valve base (3); the conical surface at the lower part of the high-pressure valve base (3) is inserted into a conical hole which is arranged in the concave way on the upper end surface of the spring seat (2);

the nozzle (7) is used for assembling the high-pressure valve shaft (5), the high-pressure spring (4), the high-pressure valve base (3) and the spring seat (2) at the lower part of the valve chamber;

the plunger (8) is arranged in the pressure relief valve piston (33), the ball body (55) on the high-pressure valve shaft (5) props against the plunger (8), the pressure relief valve piston (33) is arranged in the pressure block (11), the pressure block (11) is arranged in the valve chamber, and the pressure regulating mechanism presses the pressure block (11) on the upper part of the valve chamber; the plunger (8) is provided with a pressure relief through hole along the axial direction, and the ball body (55) on the high-pressure valve shaft (5) is contacted with the pressure relief through hole of the plunger (8); the pressure relief valve piston (33) is provided with a pressure relief valve piston air passage along the axial direction, and the pressure relief valve piston air passage is coaxial with the pressure relief through hole;

the pressure regulating mechanism comprises a lower spring support shaft (12), a low-pressure spring (13), a plane bearing (15), an upper spring support shaft (17), an upper cover (19), a pressure regulating bolt (20) and a regulating torsion handle (21),

the lower spring fulcrum (12), the low-pressure spring (13), the plane bearing (15) and the upper spring fulcrum (17) are all placed in the upper cover (19), the upper cover (19) is in threaded connection with the body (1), the lower spring fulcrum (12) contacts the top of the pressure relief valve piston (33), the upper spring fulcrum (17) is installed on the pressure regulating bolt (20) through an upper spring fulcrum fastening screw (16), and the pressure regulating bolt (20) is in threaded connection with the upper cover (19); the plane bearing (15) is sleeved on the upper spring fulcrum (17), the upper end and the lower end of the upper spring fulcrum (17) are sleeved with the gasket (14), the low-pressure spring (13) is arranged between the lower spring fulcrum (12) and the upper spring fulcrum (17), one end of the low-pressure spring (13) props against the lower spring fulcrum (12), and the other end of the low-pressure spring props against the gasket (14) on the upper spring fulcrum (17); the adjusting twist handle (21) covers the outer part of the upper cover (19), and the adjusting twist handle (21) is fixed on the pressure adjusting bolt (20) through a twist handle fastening screw (22).

2. The gas regulator according to claim 1, wherein a first O-ring (9) is disposed between the plunger (8) and the pressure relief valve piston (33), a second O-ring (18) is disposed between the outer wall of the pressure relief valve piston (33) and the inner wall of the pressure block (11), and a third O-ring (10) is disposed between the lower end surface of the pressure block (11) and the body (1).

3. The gas regulator according to claim 1, wherein the outer surface of the top of the relief valve piston (33) is a circular arc surface, and the end surface of the lower spring fulcrum (12) is concavely provided with an arc groove matched with the circular arc surface of the top of the relief valve piston (33).

4. Gas regulator according to claim 1, characterized in that a gas inlet tap (24) is provided in the gas inlet, that a gas inlet nut (25) is screwed onto the gas inlet tap (24), and that a sieve (26) is provided at the inlet of the gas inlet tap (24).

5. A gas regulator according to claim 4, wherein a high pressure gauge (27) is provided on the body (1), the high pressure gauge (27) being in communication with the gas inlet.

6. The gas regulator of claim 1, wherein an outlet ferrule (29) is provided within the gas outlet, the outlet ferrule (29) being threadably connected to a ferrule nut (32), and the gas tap is enclosed within the outlet ferrule (29) by a ferrule gasket (30) and a ferrule lock ring (31).

7. A gas regulator according to claim 6, wherein a low pressure gauge (28) is provided on the body (1), the low pressure gauge (28) being in communication with the gas outlet.