Compressing apparatus with extended variable capacity range and capacity control method thereof

摘要

A rotary compressor includes first and second compressing devices in a casing to successively carry out a parallel operation wherein first and second compressing devices are parallely driven and a single operation wherein one of first and second compressing devices is driven. A relatively high driving frequency is applied to the rotary compressor during single operation as compared to the driving frequency during parallel operation necessary to produce the same compressing capacity to enhance the EER of the rotary compressor and to extend the variable compressing capacity of the rotary compressor.