초록

In a positive displacement compressor having a plurality of banks, operation can be multi-staged or single staged. Single stage operation can be of a single bank or plural banks in parallel. Switch-over between modes of operation is under the control of a microprocessor responsive to sensed inputs.

대표청구항 ▼

Refrigeration means for cooling a zone including a closed circuit serially including compressor means, condenser means, expansion means and evaporator means: said compressor having three banks, a crankcase, a suction inlet connected to said evaporator and a discharge connected to said condenser; a f

Refrigeration means for cooling a zone including a closed circuit serially including compressor means, condenser means, expansion means and evaporator means: said compressor having three banks, a crankcase, a suction inlet connected to said evaporator and a discharge connected to said condenser; a first and a second one of said three banks being normally connected to said suction inlet; a third one of said three banks being normally connected to said crankcase and said discharge; means for selectively connecting said first and second banks to either said crankcase or said discharge; means for fluidly connecting said crankcase to said suction inlet when said first and second banks are connected to discharge; whereby when said first and second banks are connected to said crankcase they act as a first stage and said third bank acts as a second stage and when said first and second banks are connected to discharge they act as a single stage and said third bank acts as a single stage in parallel with said first and second banks.