In the cryoelectronics field where the helium gas is utilized as a working field, rotary-type and reciprocating-type compressors are popular for the discharge capacity of less than 200Nm
3/h and screw-type compressor for a larger capacity.
In this study, scroll-type fluid machinery, featuring both high efficiency and high reliability, is applied to a helium compressor with the discharge capacity of 50 Nm
3/h. Experimental investigations are performed about oil injection cooling methods and improvement of the compression efficiency.
As a result, a volumetric efficiency of 92 % and an overall adiabatic efficiency of 79 % are obtained under the condition of a theoretical compression ratio of 5.2 by a developed scroll compressor with a nominal motor output 2.2 kW.
At the same time an effective cooling method with a single oil injection port is obtained.
View full abstract