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The Working Principle of Pneumatic Actuator

Source:http://www.flowxgroup.com/Update Time:2014-05-12Hits:

Pneumatic actuator is the most commonly used in reciprocating piston type air compressor. So nowadays, this kind of actuator becomes the best-selling pneumatic actuators in the market.

When the piston is 3 to the right 2 left cavity pressure below the atmospheric pressure, 9 open the suction valve, air at atmospheric pressure of the actuator under the action of 2 left cavity into the cylinder, this process is called inspiratory process. When the piston moves to the left, 3 suction valve 9 in the left cavity compressed gas cylinder 2 closed, under the action of the left cylinder chamber gas is compressed, this process of using pneumatic actuators are called the compression process. When the left cylinder chamber air pressure increases to a slightly larger than the output after the gas pressure in the pipeline, 1 open the exhaust valve, compressed air into the pipeline, this process is known as the exhaust process. The reciprocating movement of the piston 3 is driven by electric actuator crank rotation, through the connecting rod 7, slide block 5, the piston rod is converted into linear reciprocating motion. Here for a piston cylinder work, most of the air compressor is more cylinder piston combination.

Choice of air compressor is based on the premise of the best-selling pneumatic actuator that needed for the pneumatic system working pressure and flow rate are two major parameters. General pneumatic system working pressure is 0.4 ~ 0.8 MPa, reason often choose low pressure air compressor. It can also choose medium and high voltage or super high pressure air compressor.

Cooler installed in air compressor output lines, which is used to lower the temperature of the compressed air. And make the most of vapor in the compressed air of the pneumatic and electric actuators , oil steam condensing into water droplets, oil droplets. In order to precipitate the oil-water separator. General use indirect cooler water heat exchanger, the structure has a shell and tube type, bushing, plate fin and snake tube and so on. Snake tube cooler of the actuator has simple structure, convenient in operation and maintenance. It is suitable for small flow of no pressure range, the most widely used.

Oil-water separator of the pneumatic actuator is mainly with centrifugal, impact, water and other methods to condensed moisture in the compressed air. Oil and other impurities separated from the compressed air, resulting in the preliminary purification of compressed air. Its structure has annular rotary, impact and return type, centrifugal rotary, and combinations of the above forms of water bath type etc.

Hit back and annular rotary oil-water separator of the actuator, air flow at a certain speed v1 classics input port into the separator by the baffle block is hit fold down, then produces annular rotary and at a certain rate. To achieve satisfactory result of oil-water separation of the pneumatic and rise after airflow rotating speed should be slow, the general requirements of low pressure air v2 1 m/s or less, medium pressure air v2 0.5 m/s or less, high pressure air v2 acuities were 0.3 m/s.

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