CN212718014U

CN212718014U - Gas pressure reducer

Info

Publication number: CN212718014U
Application number: CN202021565033.8U
Authority: CN
Inventors: 黄鑫; 孟令慧; 王长龙
Original assignee: China Oxygen Medical Technology Dalian Co ltd
Current assignee: China Oxygen Medical Technology Dalian Co ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-03-16
Anticipated expiration: 2030-07-31

Abstract

The utility model provides a gas pressure reducer, which comprises a main body, an upper cover, a valve block, a valve rod and a spring, wherein the upper cover is clamped with the main body; one end of the valve rod is vertical to the valve plate, and the valve rod and the valve plate are positioned in a space formed by the upper cover and the main body; the spring is sleeved on the valve rod, and two ends of the spring are compressed by the valve plate and the main body towards the inner wall of the valve plate respectively; one end of the main body is provided with a high-pressure inlet, and the inner wall of the main body facing the valve rod is provided with a high-pressure valve port; the upper cover is provided with a low-pressure outlet communicated with the outside; the valve rod is provided with a vent hole and an air passage which are communicated with each other, and the air passage is communicated with the low-pressure outlet; the high-pressure gas is decompressed through the high-pressure inlet, the high-pressure valve port, the vent hole, the air channel and the low-pressure outlet in sequence. The utility model discloses a combination of valve block, diaphragm and spring both had been suitable for high pressure operational environment and can improve outlet pressure's control accuracy again, and it is few to constitute spare part, small in size, and light in weight sets for pressure fixation, can realize high pressure differential's low output pressure, and the valve block action is fast, and the action resistance is little, and the reliability is high.

Description

Gas pressure reducer

Technical Field

The utility model relates to a gaseous decompression field especially relates to a gas pressure reducer.

Background

The pressure reducer is a device for reducing the pressure of the high-pressure gas stored in the gas cylinder into low-pressure gas required for work. The pressure reducer is an essential accessory of the pneumatic regulating valve, and mainly functions to reduce the pressure of the air source and stabilize the pressure to a fixed value, so that the regulating valve can obtain stable air source power for regulating and controlling. The pressure reducer is a valve which reduces the inlet pressure to a certain required outlet pressure through regulation and leads the outlet pressure to be automatically kept stable by relying on the energy of the medium. From the viewpoint of hydrodynamics, the pressure reducer is a throttling element with variable local resistance, namely, the flow speed and the kinetic energy of fluid are changed by changing the throttling area to cause different pressure losses, thereby achieving the purpose of pressure reduction. Then, the fluctuation of the pressure behind the valve is balanced with the spring force by means of the regulation of the control and regulation system, so that the pressure behind the valve is kept constant within a certain error range. According to the structural form, the device can be divided into a film type, a spring film type, a piston type, a lever type and a bellows type; the valve seats can be manually single seat type or double seat type according to the number of the valve seats; the valve flap can be divided into a positive action type and a reaction type according to the position of the valve flap. The high pressure cavity of the pressure reducer can be connected with a steel cylinder, and the low pressure cavity is a gas outlet and is communicated with a using system. When the valve is used, the main switch of the steel cylinder is opened, and then the pressure adjusting screw rod of the low-pressure gauge is rotated clockwise to compress the main spring and drive the membrane, the spring cushion block and the ejector rod to open the valve. The high-pressure gas at the inlet enters the low-pressure chamber after being throttled and decompressed by the high-pressure chamber and is led to the working system through the outlet. The adjusting screw rod is rotated to change the opening height of the valve, so that the throughput of high-pressure gas is adjusted and the required pressure value is reached.

Can produce specific performance demand to the pressure reducer under some specific application environment, specific demand can't be satisfied to conventional pressure reducer performance, adopts two kinds of structures of diaphragm formula and piston at gas pressure reducer application, and diaphragm formula pressure reducer generally uses in the occasion that the pressure ratio is lower that admits air, and diaphragm formula pressure reducer compares piston pressure reducer regulation precision higher. The piston type pressure reducer can be suitable for the environment with high air inlet pressure due to the structural characteristics, but the adjustment precision of the piston type pressure reducer is low, and the piston type pressure reducer can only be generally applied to occasions with low stability of output pressure or only be used as a first-level pressure reducer. In order to be suitable for the high working pressure environment and improve the control precision of outlet pressure, a second-stage pressure reducer is generally adopted, a first-stage pressure reducer adopts a piston type, and a second-stage pressure reducer adopts a diaphragm type. However, the significant disadvantages of the matching use mode are large volume and mass, and the use requirements of some products with portable requirements cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gas pressure reducer to overcome above-mentioned technical problem.

The utility model provides a gas pressure reducer, which comprises a main body, an upper cover, a valve block, a valve rod and a spring;

the upper cover is clamped with the main body; one end of the valve rod is perpendicular to the valve plate and is integrally formed, the valve rod and the valve plate are positioned in a space formed by the upper cover and the main body, the valve plate is close to the upper cover, the shaft end of the valve plate is in contact with the inner wall of the main body, and the other end of the valve rod is far away from the upper cover; the spring is sleeved on the valve rod, and two ends of the spring are compressed towards the inner wall of the valve plate by the valve plate and the main body respectively;

a high-pressure inlet is formed in one end, far away from the upper cover, of the main body, and a high-pressure valve port is formed in the inner wall, facing the valve rod, of the main body; the upper cover is provided with a low-pressure outlet communicated with the outside; the valve rod is provided with a vent hole and an air passage which are communicated with each other, and the air passage is communicated with the low-pressure outlet; and high-pressure gas is subjected to pressure reduction and discharge through the high-pressure inlet, the high-pressure valve port, the vent hole, the air channel and the low-pressure outlet in sequence.

Further, still include: a diaphragm, a sealing ring and a valve clack;

the diaphragm is fixed with the valve plate in a sealing way, and the peripheral end of the diaphragm is in contact with the inner wall of the main body; the valve clack is fixed at the free end of the valve rod and is opposite to the high-pressure valve port, and the sealing ring is sleeved on the valve rod and is positioned between the valve rod and the inner wall of the main body.

Further, a first convex edge facing the main body is arranged on the periphery of the membrane, and a first bulge and a second bulge are respectively arranged on the surfaces of the first convex edge, which are in contact with the main body and the upper cover; the main part is provided with the orientation the recess of diaphragm, first protruding along the card is gone into the recess, the upper cover extrudees the second arch.

Further, the diameter of the valve plate is at least 8 times of the outer diameter of the sealing ring.

Further, the upper cover is towards the lateral wall of valve block is fixed with the support column, be provided with the passageway in the support column, the passageway with air flue and low pressure export intercommunication.

Further, the diameter of the high-pressure valve port is not more than 3 mm.

Furthermore, the main body is provided with at least one pressure balance port which is communicated with the outside.

Furthermore, the peripheral end of the valve plate and the surface, in contact with the spring, of the valve plate is provided with a second convex edge for limiting the spring.

The utility model discloses a combination of valve block, diaphragm and spring can be suitable for the high operating pressure environment and can improve outlet pressure's control accuracy again, and it is few to constitute spare part, small in size, and light in weight sets for pressure fixation, can realize high pressure differential's low output pressure, and steady voltage precision is high, and the valve block action is fast, and the action resistance is little, and the reliability is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

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

fig. 2 is a schematic overall structure diagram of an embodiment of the present invention;

fig. 3 is an exploded view of an embodiment of the present invention;

FIG. 4 is a sectional view of a valve plate and a valve rod according to an embodiment of the present invention;

fig. 5 is an enlarged view of a in fig. 1 according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a gas pressure reducer, as shown in figures 1 and 2, comprising a main body 1, an upper cover 2, a valve plate 3, a valve rod 31 and a spring 4;

the upper cover 2 is clamped with the main body 1; one end of the valve rod 31 is perpendicular to the valve plate 3 and is integrally formed, the valve rod 31 and the valve plate 3 are located in a space formed by the upper cover 2 and the main body 1, the valve plate 3 is close to the upper cover 2, the shaft end of the valve plate 3 is in contact with the inner wall of the main body 1, and the other end of the valve rod 31 is far away from the upper cover 2; the spring 4 is sleeved on the valve rod 31, and two ends of the spring are compressed by the valve plate 3 and the main body 1 towards the inner wall of the valve plate 3 respectively;

as shown in fig. 3, one end of the main body 1 away from the upper cover 2 is provided with a high-pressure inlet 101, and the inner wall of the main body 1 facing the valve rod 31 is provided with a high-pressure valve port 102; the upper cover 2 is provided with a low-pressure outlet 201 communicated with the outside; the valve rod 31 is provided with a vent hole 3.2 and an air passage 3.1 which are communicated with each other, and the air passage 3.1 is communicated with the low-pressure outlet 201; high-pressure gas is subjected to pressure reduction and discharge through the high-pressure inlet 101, the high-pressure valve port 102, the vent hole 3.2, the gas channel 3.1 and the low-pressure outlet 201 in sequence.

Further, still include: diaphragm 32, sealing ring 34 and valve flap 33;

the diaphragm 32 is fixed with the valve plate 3 in a sealing way, and the peripheral end of the diaphragm 32 is contacted with the inner wall of the main body 1; the valve flap 33 is fixed at the free end of the valve rod 31 and opposite to the high-pressure valve port 102, and the sealing ring 34 is sleeved on the valve rod 31 and located between the valve rod 31 and the inner wall of the main body 1.

Specifically, a high-pressure cavity 100 is formed between the high-pressure valve port 102 and the high-pressure inlet 101, a low-pressure cavity 200 is formed between the upper cover 2 and the valve plate 3, an air outlet cavity 300 is formed between the sealing ring 34 and the high-pressure valve port 102, and a pressure balance cavity 400 is formed between the valve plate 3 and the main body 1;

as shown in fig. 1, after the main body 1 is connected to the gas cylinder, the high-pressure gas in the gas cylinder reaches the gas outlet cavity 300 through the high-pressure inlet 101, the high-pressure cavity 100 and the high-pressure valve port 102, then enters the low-pressure cavity 200 through the vent hole 3.2, and flows out through the low-pressure outlet 201. When the low pressure outlet 201 is closed, the pressure in the low pressure chamber 200 rises, the push valve plate 3 overcomes the spring force of the spring 4 to push the valve flap 33 to the high pressure valve port 102, the high pressure valve port 102 is closed, the air flow is blocked, the pressure in the low pressure chamber 200 does not rise any more, and the pressure is maintained at the set pressure. On the contrary, after the low pressure outlet 201 is opened, the pressure in the low pressure chamber 200 is reduced, the spring 4 pushes the valve plate 3 to open the valve flap 33, and the air flow circulates, at this time, the valve plate 3 is in a dynamic balance state.

As shown in fig. 4, the valve rod 31 is made of a hard material, and may be made of metal or hard plastic, and the diaphragm 32 is made of a rubber-like soft material, and is hermetically fixed with the valve plate 3 by encapsulation or adhesion. Not only adapts to the integral structure of the piston type valve plate, but also avoids the friction between the valve plate 3 and the side wall of the inner cavity of the main body 1.

Further, as shown in fig. 5, the diaphragm 32 is circumferentially provided with a first convex edge 32.1 facing the main body 1, and the surfaces of the first convex edge 32.1 contacting the main body 1 and the upper cover 2 are respectively provided with a first protrusion 32.2 and a second protrusion 32.3; the body 1 is provided with a recess 1.1 facing the membrane 32; and the second protrusion (32.3) on the membrane 32 is pressed by the upper cover 2.

The first convex edge 32.1 is clamped into the groove 1.1 to seal the entering high-pressure gas, wherein the first convex edge 32.2 and the second convex edge 32.3 further seal the high-pressure gas. Further, the diameter of the valve plate 3 is at least 8 times of the outer diameter of the sealing ring 34;

specifically, the pressure receiving area of the valve plate 3 is increased, so that the valve plate is more sensitive to pressure changes, and a higher decompression ratio is achieved, so that the low-pressure outlet 201 can stably output lower-pressure gas, and the pressure is also more stable. The size of the stress area of the valve plate 3 is directly related to the diameter of the air outlet cavity 300; the outer diameter of the sealing ring 34 is equal to the diameter of the air outlet cavity 300, so the diameter of the valve plate 3 is at least 8 times of the outer diameter of the sealing ring 34, that is, the diameter of the valve plate 3 is at least 8 times of the inner diameter of the air outlet cavity 300, and the outer diameter of the valve plate 3 can be increased or reduced according to the requirements of different pressures of the gas flowing out of the low-pressure outlet 201.

Further, the upper cover 2 is fixed with a support column 202 towards the side wall of the valve plate 3, a channel is arranged in the support column 202, and the channel is communicated with the air passage 3.1 and the low-pressure outlet 201.

Specifically, as shown in fig. 1, a support column 202 is disposed at a center of a sidewall of the upper cover 2 facing the valve plate 3 to limit the valve plate 3, so as to prevent the membrane 32 from being damaged due to an excessive tensile force exerted on the membrane 32 by the elastic force of the spring 4.

Further, the diameter of the high-pressure valve port 102 is smaller than that of the high-pressure inlet 101, and the diameter of the high-pressure valve port 102 is not larger than 3 mm.

Specifically, in the embodiment, the gas pressure reducer is applied to the portable oxygen cylinder, and the path diameter of 3mm of gas demand is enough to meet, and the maximum path diameter of the valve port is limited considering that the excessive path diameter of the valve port can exceed the pressure bearing limit of the diaphragm 32.

The whole valve plate 3 is subjected to pressure, including the diaphragm 32 and the valve rod 31, and the diameter of the high-pressure valve port is limited because the valve plate is used as a high-pressure reducer in the present application, and the excessive diameter of the high-pressure valve port 102 causes the valve flap 33 to correspondingly receive excessive pressure, and particularly, when the pressure of the high-pressure inlet 101 changes, the range of the pressure change received by the valve flap 33 is also large, thereby affecting the stability of the outlet pressure of the low-pressure outlet 201.

Further, at least one pressure balance port 103 is arranged on the main body 1, and the pressure balance port 103 is communicated with the outside.

Specifically, as shown in fig. 1, the main body 1 is provided with a pressure balance port 103 for communicating the pressure balance chamber 400 with the outside atmosphere. The pressure balance port 103 ensures that the pressure of the valve plate 3 on the side of the spring 4 is always kept at the atmospheric pressure, so as to ensure that the pressure in the low-pressure cavity 200 is constant.

Furthermore, the peripheral end of the valve plate 3 and the surface contacted with the spring 4 is provided with a second convex edge 35 for radially limiting the spring 4. The inner side wall of the body 1 can also be used as a radial limit structure of the spring 4.

The beneficial effect of this application is as follows:

1. overall structure overall arrangement is compact, and is highly little, and space utilization is high, compares with traditional pressure reducer and has reduced axial dimensions by a wide margin under the prerequisite of guaranteeing basic performance, more can adapt to the demand of portable application.

2. The improved valve plate design increases the area of the valve plate, is more sensitive to pressure change, increases the diaphragm made of rubber materials on the periphery of the valve plate, eliminates the operation friction resistance of the piston type valve plate, and ensures that the output pressure is more stable to meet the requirement of low-pressure stabilization under the working condition of high pressure reduction ratio.

3. Compared with a piston type pressure reducer structure, the valve plate acts fast, the response speed of outlet pressure change is fast, and the requirement of periodic frequent opening and closing for air supply is met.

4. The device has the advantages of few components, simple process, high reliability and low cost.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A gas pressure reducer characterized by: comprises a main body (1), an upper cover (2), a valve plate (3), a valve rod (31) and a spring (4);

the upper cover (2) is clamped with the main body (1); one end of the valve rod (31) is vertically connected with the valve plate (3), and the other end of the valve rod (31) is far away from the upper cover (2); the valve rod (31) and the valve plate (3) are located in a space formed by the upper cover (2) and the main body (1), the valve plate (3) is close to the upper cover (2), the shaft end of the valve plate (3) is in contact with the inner wall of the main body (1), the spring (4) is sleeved on the valve rod (31), and two ends of the spring are compressed by the valve plate (3) and the main body (1) respectively;

a high-pressure inlet (101) is formed in one end, far away from the upper cover (2), of the main body (1), and a high-pressure valve port (102) is formed in the inner wall, facing the valve rod (31), of the main body (1); the upper cover (2) is provided with a low-pressure outlet (201); the valve rod (31) is provided with a vent hole (3.2) and an air passage (3.1) which are communicated with each other, and the air passage (3.1) is communicated with the low-pressure outlet (201); high-pressure gas sequentially passes through the high-pressure inlet (101), the high-pressure valve port (102), the vent hole (3.2), the gas channel (3.1) and the low-pressure outlet (201) to be subjected to pressure reduction and discharge.

2. The gas pressure reducer according to claim 1, further comprising: a diaphragm (32), a sealing ring (34) and a valve flap (33);

the diaphragm (32) is fixed with the valve plate (3) in a sealing mode, and the peripheral end of the diaphragm (32) is in contact with the inner wall of the main body (1); the valve flap (33) is fixed at the free end of the valve rod (31) and is opposite to the high-pressure valve port (102); the sealing ring (34) is sleeved on the valve rod (31) and is positioned between the valve rod (31) and the inner wall of the main body (1).

3. Gas pressure reducer according to claim 2, wherein the diaphragm (32) is circumferentially provided with a first ledge (32.1) facing the body (1), the surfaces of the first ledge (32.1) in contact with the body (1) and the upper lid (2) being provided with a first protrusion (32.2) and a second protrusion (32.3), respectively; the main part (1) is provided with the orientation recess (1.1) of diaphragm (32), first protruding edge (32.1) card is gone into recess (1.1), upper cover (2) extrude second arch (32.3).

4. Gas pressure reducer according to claim 3, wherein the diameter of the valve plate (3) is at least 8 times the outer diameter of the sealing ring (34).

5. Gas pressure reducer according to claim 4, characterized in that a support column (202) is fixed to the side wall of the upper cover (2) facing the valve plate (3), and a passage is arranged in the support column (202) and is communicated with the gas channel (3.1) and the low pressure outlet (201).

6. A gas pressure reducer according to claim 1, wherein the high-pressure valve port (102) has a diameter smaller than the high-pressure inlet (101), the high-pressure valve port (102) having a diameter not larger than 3 mm.

7. Gas pressure reducer according to claim 1, wherein the body (1) is provided with at least one pressure equalizing port (103), the pressure equalizing port (103) being in communication with the outside.

8. Gas pressure reducer according to claim 1, wherein the peripheral end of the face of the valve plate (3) in contact with the spring (4) is provided with a second ledge (35) that limits the spring (4).