Freeze dryer optional refrigeration compressor
Freeze dryer equipment optional refrigeration compressor introduction: The compressor is the core of the refrigeration system of the freeze-drying machine. The compressor mainly compresses the gaseous freon and sucks the low-temperature and low-pressure gaseous freon from the suction port. After compression by the piston or screw, it becomes the high-temperature and high-pressure gaseous freon. out through the exhaust pipe.
Compressors can be divided into piston compressors and screw compressors according to the form of compression. Piston compressors can be divided into three types: open type, semi-hermetic type, and fully-closed type. According to the level of compression, compressors can be divided into single-stage compressors, two-stage compressors, and cascade compressors. Most of them are piston semi-hermetic two-stage compressors. The small freeze-drying machine uses a piston-type semi-hermetic single-stage compressor or a piston-type fully-hermetic single-stage compressor.
1. The structure of the piston compressor
A piston compressor is mainly composed of a motor, steam valve, cylinder liner, steam volume adjustment, crankshaft, connecting rod assembly, piston assembly, shaft seal, body assembly, lubrication system, etc. The steam valve is mainly composed of a valve seat, valve plate, steam valve spring, and lift limiter.
2. Compared with traditional reciprocating refrigeration compressors, screw refrigeration compressors have great advantages.
①High working efficiency. There is no need to convert rotary motion into reciprocating motion, which reduces the mechanical loss caused by it; there is no re-expansion process without residual gas in the clearance volume, no sliding friction, and no need to set suction and exhaust valve plates, indicating Both the efficiency and the mechanical efficiency are higher than the efficiency.
②Good energy regulation. The relative adjustment ability of reciprocating compressors is poor, while screw compressors are outstanding in this regard. Their cooling capacity can be adjusted steplessly between 15% and 100%. When the cooling capacity is adjusted between 60% and 100%, its power consumption and cooling capacity change in the same proportion.
③Good running performance. Due to the simple structure of the screw refrigeration compressor, the number of parts is only 1/10 of the piston type, the compressor is reliable, safe, small in amplitude, strong in adaptability, and has good performance in the application of high and low turbidity refrigeration.
