CN2921472Y - Pneumatic valve - Google Patents

Abstract

The utility model belongs to a valve, in particular to a pneumatic valve capable of quick closing and opening, which mainly comprises a valve body, a hollow piston, a piston gas chamber, a gyrostat and a connection rod. In the gas admission end of the valve body is arranged with a piston device which consists of the hollow piston, the connection rod and the gyrostat connected with the hollow piston. The piston gas chamber is provided with 2 holes for gas admission or exhaust. The big end plane of the gyrostat is the closed seal plane of the valve. The pneumatic valve is characterized in that: the built-in hollow piston structure is adopted to enable axial flow of fluid along the hollow passage in the hollow piston and achieve the object of quick closing and opening of the valve through inversion of gas source in the gas chamber.

Description

A kind of pneumatic valve

Technical field the utility model belongs to a kind of valve, particularly a kind of quick pass, opens pneumatic valve.

Background technique enters the line transportation epoch with society: gas ductwork, heating, potable water, chemical industry gas, liquid or the like conveyance conduit increases sharply.The pipeline valve product increases thereupon, has fed back the valve performance technology requirement simultaneously.Valve is of a great variety, is applied to mesohigh large diameter pipeline valve products first-selection at present be: pneumatic ball valve and electric ball valve.Pneumatic ball valve, it is mated by pneumatic actuator, and electric ball valve is by 200 volts or 380 volts of ac power supply couplings, and both exist, and volume is big, cost is high, adopts power supply dangerous, brings obstruction to pipe network management control, safety guarantee designing requirement.

Summary of the invention is in order to overcome the external pneumatic actuator volume and the high deficiency of cost of existing pneumatic ball valve, a kind of pneumatic valve of the utility model provides a kind of being finished by the built-in hollow piston of valve body to close, open, not only volume is little, and the low pneumatic valve of cost, be applied to the demand for control of mesohigh pipeline.

The technological scheme that its technical problem that solves the utility model adopts is: be provided with hollow piston, piston air chamber, connecting rod connection hollow piston and gyrostat at the valve body entrance point, valve body is provided with air inlet or the exhaust port and the source of the gas sprocket hole of piston air chamber.It is characterized in that: the big end of gyrostat garden diameter is 0.8-1.5 a times of valve nominal bore diameter.Gyrostat garden arc dia is 0.4-3 a times of gyrostat Outside diameter.Hollow piston close, open thrust workmanship area be valve nominal bore 0.5-3 doubly, hollow piston hollow channel bore be valve nominal bore 0.5-1.2 doubly, hollow piston, connecting rod and gyrostat are combined into one.The built-in hollow piston that is synchronized with the pipeline operating pressure advances or moves back to drive gyrostat and port opening, closure become valve closing or unlatching.The hollow piston that is synchronized with the pipeline operating pressure has solved because of what the pipeline pressure changing factor brought and has closed impacting force and open the puzzlement that thrust changes.Especially flow axis reduces the pressure loss to circulation.

The utility model beneficial effect is: built-in hollow piston replaces external pneumatic actuator, and is simple in structure, and flow axis reduces the pressure loss to circulation.Especially be suitable for emergent quick closedown, the unlatching of mesohigh pipeline.

Description of drawings is described in further detail the utility model below in conjunction with drawings and Examples:

Fig. 1, be the structural representation of a kind of pneumatic valve of the utility model.

Fig. 2, be the utility model gyrostat, connecting rod, hollow piston modular construction schematic representation.

Among Fig. 1 and Fig. 2,1 housing, 2 hollow pistons, 3 connecting rods, 4 gyrostats, 5,6 piston air chambers, 7,8, the side of advancing or exhaust port, 9 source of the gas sprocket holes, 10 " O " RunddichtringO, 11 air outlet potted lines, 12 suction ports, 13 air outlets.

Embodiment: as shown in Figure 1: the interior leading portion of valve body (1) is provided with hollow piston (2), and connecting rod (3) connects hollow piston (2) and gyrostat (4) is integral.Air inlet on piston air chamber (5), (6) and the valve body (1) or exhaust port (7), (8) communicate, and moving of piston should have " O " RunddichtringO (10) as sealing, and source of the gas sprocket hole (9).The valve body back segment is provided with air outlet potted line (11) and produces hollow piston (2) by the transposing of piston air chamber (5), (6) source of the gas

Front or rear moving.Air outlet potted line (11) equals valve nominal bore sectional area with all areas of the big Transverse plane displacement distance of gyrostat (4).Hollow piston (2) work done area is 0.5～3 times of valve nominal open area.

Hollow piston (2) hollow channel is 0.5～1.2 times of valve nominal bore area.

Gyrostat in above-mentioned (2) Outside diameter is 0.8～1.5 times of valve nominal bore.

Gyrostat (4) garden arc dia is 0.4～3 times of gyrostat Outside diameter.

Below in conjunction with accompanying drawing working principle of the present utility model is elaborated:

Fluid flow path suction port (12) and hollow piston (2) hollow channel, simultaneously, flow path gyrostat (4) and air outlet (13).There is flow promptly to produce pressure.Pressure is equal everywhere in the Pascal's law principle valve body (1).Connect source of the gas (9) and air inlet or exhaust port (8) this moment as required, piston air chamber (6) air inlet, fluid pressure and piston work done area relationship produce thrust.Hollow piston (2) moves to piston air chamber (5), forms the same moved further of connecting rod (3) gyrostat (4) of one, and big Transverse plane of gyrostat during to setpoint distance (4) and air outlet potted line (11) compress, and forms and cuts off circulation.If connect source of the gas (9) and air inlet or exhaust port (7); Piston air chamber (5) air inlet, piston air chamber (6) exhaust this moment, hollow piston (2) is moved to piston air chamber (6) by piston air chamber (5) pressure thrust, and so repeating promptly is to close and Open valve.

In the above-mentioned working principle: the aerodynamical resistance of gyrostat (4) convection cell is few; The thrust that produces during sealing is little, has reduced piston work done area, reaches the valve volume purpose of dwindling.Realize a kind of: close fast, open.Pressure range is wide, can be matched with a kind of pneumatic valve of secondary meter.

Claims (3)

1, a kind of pneumatic valve, inlet end in valve body (1) is provided with hollow piston (2), piston air chamber (5), (6), connecting rod (3) connection hollow piston (2) and gyrostat (4), valve body (1) are provided with air inlet or exhaust port (7), (8) and the source of the gas sprocket hole (9) of piston air chamber (5), (6), it is characterized in that:

A) to hold the garden diameter greatly be 0.8～1.5 times of valve nominal bore diameter to gyrostat (4);

B) gyrostat (4) garden arc dia is 0.4～3 times of gyrostat (4) Outside diameter.

2, a kind of pneumatic valve according to claim 1 is characterized in that:

A) to close, open thrust acting area be 0.5～3 times of valve nominal bore area to hollow piston (2);

B) hollow piston (2) hollow channel bore is 0.5 times～1.2 times of valve nominal bore area.

3, a kind of pneumatic valve according to claim 1 and 2 is characterized in that: hollow piston (2) connecting rod (3) and gyrostat (4) are combined into one.

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