CN205173615U - Gaseous pressure reducer of diaphragm formula - Google Patents

Abstract

The utility model discloses a diaphragm type gas pressure reducer, which relates to the field of gas pressure reducers and comprises a diaphragm assembly and a safety push rod. The diaphragm assembly is provided with a safety cavity, and the safety push rod is in the shape of a piston. And it is slidably arranged in the safety chamber, and a through hole communicating with the safety chamber is provided on one side of the diaphragm assembly. In the utility model, the safety push rod is arranged on the diaphragm assembly, and the entire pressure reducing valve can be designed as a rotary body, and the rotation axes of the shunt valve, valve body, guide valve seat, diaphragm assembly, and safety push rod overlap, which has a high degree of integration. High, simple and reasonable structure, beautiful external shape, small valve volume, light weight and other advantages.

Description

A diaphragm type gas pressure reducer

technical field

The utility model relates to the field of gas pressure reducers, in particular to a diaphragm type gas pressure reducer.

Background technique

A gas pressure reducer is a device that decompresses and regulates the flow of high-pressure gas. The gas pressure reducer is widely used. When the pressure in the high-pressure gas cylinder or pipeline is too high to work, the pressure must be reduced through the pressure reducer to achieve the pressure required for normal use. The pressure reducer not only has the function of reducing pressure, but also has the function of stabilizing the pressure. When the flow rate at the outlet of the gas cylinder or pipeline changes, the pressure reducing and regulating pressure of the pressure reducer can maintain a stable output pressure.

Gas pressure reducing valves are widely used in the gas pipeline system to decompress the high-pressure gas to the required low pressure to meet the needs of the system. In terms of pressure reduction, both the pressure reducing valve and the throttle valve have the function of reducing pressure, reducing the inlet pressure to a certain required outlet pressure; However, because its throttling area is constant, its outlet pressure changes with the inlet pressure and cannot be stabilized to a constant value; the pressure reducing valve relies on its own elastic elements and the energy of the medium to make it throttling The flow area changes with the change of the inlet pressure, and its throttling pressure drop also changes accordingly, keeping the outlet pressure basically unchanged from the surface. In short, the working principle of the pressure reducing valve is throttling. When the gas flows through the gap between the valve and the valve seat, a pressure drop is generated to achieve the purpose of decompression.

The existing gas pressure reducer is equipped with a safety valve, but the position of the safety valve is independent, which leads to a complex and cumbersome structure of the pressure reducing valve. body.

Utility model content

In view of this, the purpose of this utility model is to provide a diaphragm type gas pressure reducer, in which the safety valve assembly is arranged in the diaphragm assembly, so as to solve the problems of complex structure and difficult processing of the existing pressure reducing valve.

The technical solution adopted in order to achieve the purpose of the utility model is: a diaphragm type gas pressure reducer, which is characterized in that it includes a diaphragm assembly and a safety push rod, the diaphragm assembly is provided with a safety cavity, and the safety The push rod is in the shape of a piston and is slidably arranged in the safety chamber, and a through hole communicating with the safety chamber is provided on one side of the diaphragm assembly.

Further, the diaphragm assembly includes a movable seat and a diaphragm, and the diaphragm is fixed on the outer surface of the movable seat.

Further, the shapes of the diaphragm assembly and the safety push rod are both rotary bodies.

Further, a safety spring is provided at the end of the safety push rod.

Further, the diaphragm assembly also includes a lock nut, the outer surface of the movable seat is provided with steps along the circumferential direction, the outer surface of the movable seat is provided with threads in the axial direction, the lock nut is matched with the threads and will The membrane is pressed against the step.

Further, it also includes a valve body and a guide valve seat. A cavity is provided inside the valve body, and the guide valve seat is arranged in the cavity. Both the valve body and the guide valve seat are rotary bodies.

Further, the two ends of the guide valve seat are respectively provided with a left chamber and a right chamber, and an air inlet is provided on the corresponding valve body wall between the left chamber and the right chamber, and the air inlet is connected with the guide valve seat. The left cavity is connected, the left cavity communicates with the right cavity, the movable seat of the diaphragm assembly is slidingly fitted with the right cavity, and the rotation center axes of the valve body, the guide valve seat and the diaphragm assembly coincide.

Further, it also includes an outlet joint, the outlet joint is connected to one end of the movable valve seat, a shunt valve is slidably arranged in the left cavity of the guide valve seat, and a return spring is provided between the shunt valve and the outlet joint , The shunt valve and the diaphragm assembly are connected by a push rod.

Further, it also includes a pressure regulating nut, the pressure regulating nut is fixedly connected to the end of the valve body, and the pressure regulating nut fixes the outer edge of the diaphragm on the end of the valve body; A pressure regulating spring is arranged between the sheet assembly and the pressure regulating nut.

Further, the pressure regulating nut is connected to the safety spring at the end of the safety push rod, and the end of the pressure regulating nut is provided with a safety air outlet.

The beneficial effects of the utility model:

The utility model has the advantages of simple structure, stable pressure, light weight, convenient adjustment and installation, etc. When the flow rate at the outlet of the gas cylinder or pipeline changes, it can maintain a stable output pressure through the decompression adjustment of the pressure reducer. The overflow function of the safety push rod and the change of the opening of the diverter valve assembly and the diverter valve stabilize the output pressure at the outlet of the pressure reducer.

The safety push rod is set on the diaphragm assembly, and the entire pressure reducing valve can be designed as a rotary body, and the rotation axes of the diverter valve, valve body, guide valve seat, diaphragm assembly, and safety push rod coincide, and its integration is high. The design is simple and reasonable, and the external shape is beautiful, which can make the pressure reducing valve smaller in size and lighter in weight.

Description of drawings

Fig. 1 is the structural representation of the diaphragm type gas pressure reducer provided by the utility model;

Fig. 2 is a schematic structural view of the diaphragm assembly of the diaphragm gas pressure reducer provided by the utility model.

In the figure: 1. Right chamber; 2. Outlet joint; 3. Outlet; 4. Return spring; 5. Left chamber; 6. Diverter valve; 7. Inlet duct; 8. Air inlet; 10, pressure regulating spring; 11, safety spring; 12, safety air outlet; 13, fixed screw sleeve; 14, pressure regulating nut; 15, sliding gasket; 16, compression cover; 17, safety push rod; 18, Spacer; 19, push rod; 20, valve body; 21, guide valve seat; 22, movable seat; 23, lock nut; 24, through hole; 25, thread; 26, diaphragm; 27, safety chamber.

detailed description

The utility model will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

Fig. 1 shows a kind of diaphragm type gas decompressor provided by the utility model, comprises diaphragm assembly 9, safety push rod 17, is provided with safety chamber 27 in diaphragm assembly 9, and safety push rod 17 is piston-shaped and The slide is arranged in the safety chamber 27, and the inner wall of the safety chamber 27 is provided with a through hole 24 communicating with one side of the diaphragm assembly.

Figure 2 shows the structure of the diaphragm assembly 9, the diaphragm assembly 9 includes a movable seat 22, a diaphragm 26, a lock nut 23, the outer surface of the movable seat 22 is provided with steps along the circumferential direction, and the outer surface of the movable seat 22 is arranged along the axial direction. There are threads 25, and the locking nut 23 cooperates with the threads 25 and compresses the diaphragm 26 on the step.

In this embodiment, the valve body 20, the guide valve seat 21, and the diaphragm assembly 9 are all revolving bodies, and their rotation axes coincide, that is, the diaphragm assembly 9 has a central axis, and the safety chamber 27 is arranged on the movable seat 22. Inside, the central axes of the two coincide. The safety push rod 17 in the safety chamber 27 is in the shape of a piston and can slide in the safety chamber 27. There can be one or more through holes 24 on the inner wall of the safety chamber 27. The through hole 24 leads to the side where the safety push rod 17 protrudes from the movable seat 22 seat body; position, the inner edge of the diaphragm 26 is pressed by the lock nut 23 on the step on the outer surface of the movable seat 22, the outer edge of the diaphragm 26 cooperates with the inner surface of the valve body 20, and the corresponding position on the inner surface of the valve body 20 is also provided with a step , and the outer edge of the diaphragm 26 is pressed against the step on the inner surface of the valve body 20 by the compression cover 16 through the spacer 18 . In this way, the whole valve body 20 is divided into two isolated parts by the diaphragm 26 and the safety push rod 17 . The end that protrudes from the safety push rod 17 is fixedly provided with a sliding washer 15, and the safety spring 11 and the sliding washer 15 are all arranged inside a fixed screw sleeve 13, and the pressure regulating nut 14 fixes the fixed screw sleeve 13 on the pressure On the tightening cover 16, the pressing cover 16 and the valve body 20 are also fixed together by screw threads, the pressure regulating spring 10 is arranged between the locking nut 23 and the pressure regulating nut 14, and the safety spring 11 is arranged on the sliding gasket 15 Between the fixed screw sleeve 13, the inner wall of the fixed screw sleeve 13 has a through hole, so that the internal space of the fixed screw sleeve 13 communicates with the safety cavity 27, and the end of the fixed screw sleeve 13 is provided with a safety air outlet 12.

On the other side of the valve body 20 separated by the diaphragm 26 and the safety push rod 17, the guide valve seat 21 is arranged inside the valve body 20, and the two ends of the guide valve seat 21 have a left chamber 5 and a right chamber 1 respectively, as mentioned above The movable seat 22 of the valve assembly 9 is slidably arranged in the right chamber 1, and the shunt valve 6 is arranged inside the left chamber 5 of the guide valve seat, and the air outlet joint 2 and the air outlet joint 2 are fixedly arranged on the left end of the guide valve seat 21. There is an air outlet 3 on the top, and a return spring 4 is provided between the diverter valve 6 and the air outlet joint 2; an air inlet is provided on the inner wall of the valve body 20 corresponding between the left chamber 5 and the right chamber 1 of the guide valve seat 21 8. On the guide valve seat 21, there is an air inlet 7 corresponding to the air inlet 8, and the gas flows to the diverter valve 6 through the inlet port 8, and the gas is controlled by the opening between the diverter valve 6 and the guide valve seat 21. The gas pressure of the air port; between the left chamber 5 and the right chamber 1, guide the valve seat 21. This position not only has the air inlet 7, but also has a communication hole along the left wall of the right chamber 1. There are 3 communication holes in total. One, in Fig. 1, because it is a sectional view, we can only see one, and there is a push rod 19 connecting the shunt valve 6 and the movable seat 22 in this hole, that is to say, the remaining two holes connect the left cavity 5 It communicates with the right chamber 1.

When the entire gas decompression valve is working, the gas enters the valve body from the air inlet 8, flows along the air inlet 7 to the diverter valve 6, and after passing through the diverter valve 6, the pressure of the gas decreases to a certain value, and reaches the vicinity of the gas outlet 3, Simultaneously, when the air intake passage 7 flows to the diverter valve 6, the undecompressed gas also leads to the right chamber 1. The gas pressure in the right chamber 1 is within the safe pressure range, and the safety push rod 17 relies on the pressure of the safety spring 11. The tightening force covers the through hole 24, and the high-pressure gas in the right chamber 1 pushes the diaphragm 26 to compress the pressure regulating spring 10. During normal operation, the return spring 4, the shunt valve 6, the diaphragm assembly 9, and the pressure regulating spring 10 are in a balanced state; When the pressure at the air inlet 8 increases, the diaphragm 26 moves to the right to increase the compression of the pressure regulating spring 10, and the diaphragm assembly 9 drives the diverter valve 6 to move to the right, so that the gap between the diverter valve 6 and the guide valve seat 21 The opening of the valve decreases, and the pressure loss increases, so as to keep the gas pressure at the position of the gas outlet 3 constant; on the contrary, when the pressure of the gas inlet 8 decreases, the diverter valve 6 will move to the left under the drive of the diaphragm assembly 9, and the opening increases, the pressure drop decreases, and the pressure at the outlet 3 remains constant.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. A diaphragm type gas pressure reducer, characterized in that it comprises a diaphragm assembly and a safety push rod, the diaphragm assembly is provided with a safety chamber, and the safety push rod is piston-shaped and slidably arranged in the safety chamber Inside, one side of the diaphragm assembly is provided with a through hole communicating with the safety cavity. 2. The diaphragm type gas pressure reducer according to claim 1, wherein the diaphragm assembly comprises a movable seat and a diaphragm, and the diaphragm is fixed on the outer surface of the movable seat. 3 . The diaphragm type gas pressure reducer according to claim 2 , wherein the diaphragm assembly and the safety push rod are both revolving bodies. 4 . 4. The diaphragm type gas pressure reducer according to claim 3, wherein a safety spring is provided at the end of the safety push rod. 5. The diaphragm type gas pressure reducer according to claim 4, characterized in that, the diaphragm assembly also includes a locking nut, the outer surface of the movable seat is provided with steps along the circumferential direction, and the outer surface of the movable seat is along the A thread is provided in the axial direction, and the locking nut cooperates with the thread and presses the diaphragm on the step. 6. The diaphragm gas pressure reducer according to claim 4, further comprising a valve body and a guide valve seat, a cavity is provided inside the valve body, and the guide valve seat is arranged in the cavity , the valve body and the guide valve seat are all rotary bodies. 7. The diaphragm gas pressure reducer according to claim 6, characterized in that, the two ends of the guide valve seat are respectively provided with a left chamber and a right chamber, and the corresponding valve body between the left chamber and the right chamber There is an air inlet on the wall, the air inlet communicates with the left chamber of the guide valve seat, the left chamber communicates with the right chamber, the movable seat of the diaphragm assembly is slidably fitted with the right chamber, and the valve body , the center axis of rotation of the guide valve seat and the diaphragm assembly are coincident. 8. The diaphragm gas pressure reducer according to claim 7, further comprising an outlet joint connected to one end of the movable valve seat, and sliding in the left cavity of the guide valve seat A shunt valve is provided, and a return spring is provided between the shunt valve and the outlet joint, and the shunt valve and the diaphragm assembly are connected through a push rod. 9. The diaphragm type gas pressure reducer according to claim 7, further comprising a pressure regulating nut fixedly connected to the end of the valve body, and the pressure regulating nut The outer edge of the diaphragm is fixed on the end of the valve body; a pressure regulating spring is arranged between the diaphragm assembly and the pressure regulating nut. 10. The diaphragm type gas pressure reducer according to claim 9, characterized in that the pressure regulating nut is connected to the safety spring at the end of the safety push rod, and the end of the pressure regulating nut is provided with a safety spring. gas outlet.