Compressor HVAC: Description and Operation

COMPRESSOR




The rotary type compressor consists of an integrally formed rotor and shaft, five vanes, and a cylinder.

As the rotor turns, the vanes that are movally fitted in the rotor slide over the wall of the oval-shaped cylinder while drawing, compressing, and discharging refrigerant gas.

There is a check valve in the rear head to avoid reverse rotation of the compressor which would otherwise occur when the compressor is stopped.

. PRESSURE RELIEF VALVE
This valve opens if the pressure of the high-pressure refrigerant gas rises to a dangerously high level to release part of refrigerant into the atmosphere, thus protecting the compressor. The valve is designed to limit the amount of released gas to the necessary minimum.

Valve opening pressure: 3.6 MPa (36.5 kgf/sq.cm)
Valve closing pressure: 2.99 MPa (30.5 kgf/sq.cm)

2. TRIGGER VALVE
This valve applies back pressure to the vanes.

3. CHECK VALVE
This valve is attached to the refrigerant suction port in the rear head and prevents reverse flow of the refrigerant when the compressor is stopped.

4. DISCHARGE VALVE
This valve is attached to the outlet port in the cylinder and prevents reverse flow of the refrigerant.

5. COMPRESSOR OIL
A specified amount of oil is filled in the cylinder and this oil is delivered to various locations by the refrigerant output pressure.