According to its principle, compressors can be divided into positive displacement compressors and speed compressors. Volumetric type is divided into reciprocating compressor and rotary compressor; Speed compressors are divided into axial compressors, centrifugal compressors and mixed-flow compressors.
At present, the compressors of household refrigerators and air conditioners are all positive displacement, which can be divided into reciprocating and rotary types. Reciprocating compressors adopt piston, crank and connecting rod mechanism or piston, crank and sliding tube mechanism, and rotary compressors are mostly rolling rotors. Commercial air conditioners are mostly centrifugal, scroll and screw.
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Used in air compressor, mainly used to adjust the start-stop state of air compressor. By adjusting the pressure in the gas storage tank, the air compressor can stop and rest, which has a maintenance effect on the machine. When the air compressor leaves the factory for debugging, adjust it to the specified pressure according to the customer's needs, and then set a pressure difference. For example, when the pressure reaches 10kg, the air compressor stops or unloads, and when the pressure reaches 7kg, the air compressor restarts, and there is a pressure difference here.
The compressor is directly driven by the motor, which makes the crankshaft rotate and drives the connecting rod to make the piston reciprocate, causing the volume change of the cylinder. Due to the change of pressure in the cylinder, air enters the cylinder through the intake valve and the air filter (muffler). In the compression stroke, due to the reduction of the cylinder volume, compressed air enters the air storage tank through the exhaust pipe and the check valve (check valve). When the exhaust pressure reaches the rated pressure of 0.7MPa, it is automatically stopped by the pressure switch. When the pressure of the gas storage tank drops to 0.5-0.6MPa, the pressure switch is automatically turned on and started.