7 advantages of screw refrigeration compressors

7 advantages of screw refrigeration compressors

As a kind of rotary refrigeration compressor, screw refrigeration compressor has the characteristics of both piston type and power type (speed type).

　　 1. Compared with reciprocating piston refrigeration compressors, screw refrigeration compressors have a series of advantages such as high speed, light weight, small volume, small footprint and low exhaust pulsation.

　　2. The screw refrigeration compressor has no reciprocating mass inertia force, good dynamic balance performance, stable operation, small vibration of the base, and a small foundation.

3. The structure of the screw refrigeration compressor is simple, the number of parts is small, there are no vulnerable parts such as air valves, piston rings, etc. Its main friction parts such as rotors, bearings, etc., are relatively high in strength and wear resistance, and lubrication conditions Good, so the machining volume is small, the material consumption is low, the operation cycle is long, and the maintenance is simple, which is beneficial to realize the automation of operation.

4. Compared with the speed compressor, the screw compressor has the characteristics of forced air delivery, that is, the displacement is almost not affected by the discharge pressure, and no surge phenomenon occurs when the displacement is small. Within the range of conditions, high efficiency can be maintained.

　　5. The slide valve is used to adjust, which can realize stepless adjustment of energy.

　　6. ​​Screw compressors are not sensitive to liquid intake and can be cooled by oil injection. Therefore, under the same pressure ratio, the exhaust temperature is much lower than that of the piston type, so the single-stage pressure ratio is higher.

　　7. There is no clearance volume, so the volumetric efficiency is high.

　　 screw refrigeration compressor still has the following defects:

　　1. The refrigerant gas periodically passes through the suction and exhaust ports at high speed, and leaks through the gaps, etc., which makes the compressor very noisy and requires noise reduction measures.

　　2. The machining accuracy of the space surface of the spiral rotor is required to be high, and special equipment and tools are required for machining.

　　3. Due to the limitation of gap seal and rotor rigidity, screw compressors cannot reach the higher final pressure like reciprocating compressors.