How to distinguish between screw refrigeration compressor and piston refrigeration compressorDistinguish from type Screw refrigeration compressors and piston refrigeration compressors are both volumetric compressors, and screw refrigeration compressors are a new type of high-speed refrigeration compressors. distinguish in principle From the point of view of the principle of compressing gas, the two compressors have a common point in that the gas is compressed by the change in volume; the difference is that the two types of compressors achieve different changes in working volume. The piston refrigeration compressor uses the movement of the crankshaft connecting rod mechanism to change the working volume of the cylinder; the screw refrigeration compressor uses the rotation of the rotor directly connected to the shaft to change the working volume
Distinguish from the overall structure The screw refrigeration compressor does not have the cylinder, piston, piston ring, cylinder liner and other vulnerable parts required by the piston refrigeration compressor. The machine has a compact structure, small volume, light weight, no clearance volume, and a small amount of liquid enters the machine. Liquid strike hazard. The live valve can be used for 10% to 100% stepless energy adjustment. It has a wide range of application, stable and reliable operation, long maintenance cycle, and trouble-free operation time up to (2～5)×104h. Due to the use of lubricating oil, the cooling and sealing performance of the machine is improved, and the exhaust temperature is reduced. Even if the evaporation temperature is low (-40°C) and the compression is relatively high (about 25), it can still be operated in single stage, that is, within a certain range Can replace the two-stage compression cycle. However, the processing and assembly of screw refrigeration compressors require high precision, which is not suitable for variable operating conditions, and there is a lot of noise. Under normal circumstances, noise reduction and sound insulation equipment are required. Lubricating oil requires more auxiliary equipment such as oil pump, oil cooler and oil recoverer.
