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Piston-type compressors are cylinders, valves and reciprocating motion of the piston in the cylinder displacement posed by changing to complete. If piston-type compressors are not considered practical volume loss and power loss (that is, the ideal working process), then every rotation of the crankshaft of piston compressor for a week of work done can be divided into process of suction, compression and exhaust and compression process.

The compression process

From the TDC upwards movement of the piston, suction and discharge valves are closed, the gas was compressed in a closed cylinder, due to decreasing cylinder volume, pressure and temperature is gradually increased until the gas pressure in the cylinder and the exhaust pressure is equal. Compression process has generally been viewed as an isentropic process.

Exhaust process

Piston continued to move upward, causing the gas pressure in the cylinder is greater than the discharge pressure, the exhaust valve opens, gas Pistons that push the lower pressure in the cylinder out of the cylinders into the exhaust pipe, until the piston reaches TDC. At this time due to gravitational valve and exhaust valve Spring forces the role of exhaust valve closes the exhaust end.

At this point, the compressor has completed a process of suction, compression and exhaust the three work cycle consisting of. Since then, the downward movement of the piston, repeat the above three processes, so the cycle cycle. This is the ideal working process and principle of piston type refrigeration compressor.