Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
A variable capacity multiple compressor refrigeration system comprising first and second refrigerant compressors, each compressor having suction inlet and discharge ports adapted to be connected to the suction of the system, means to connect the discharge ports in parallel to the refrigeration system, means to cycle-off said second compressor while the first compressor continues to run for reduced capacity of the system a check valve in said means to connect to prevent discharge gas from said first compressor from entering the discharge port of the second cycledoff compressor, a bypass line connected to the suction of the system and to said means to connect at a point between the check valve and the discharge port of the second compressor, a valve in said bypass line, and valve control means to control said valve to be closed when both compressors are running and to be open when said second compressor is cycled-off.
Claim 2
Dependent Claim
151 words
A variable capacity multiple compressor refrigeration system comprising first and second refrigerant compressors, each compressor having suction inlet and discharge ports adapted to be connected to the suction of the system, means to connect the discharge ports in parallel to the refrigeration system, means to cycle-off said second compressor while the first compressor continues to run for reduced capacity of the system a check valve in said means to connect to prevent discharge gas from said first compressor from entering the discharge port of the second cycledoff compressor, a bypass line connected to the suction of the system and to said means to connect at a point between the check valve and the discharge port of the second compressor, a valve in said bypass line, and valve control means to control said valve to be closed when both compressors are running and to be open when said second compressor is cycled-off.
Claim 3
Dependent Claim
13 words
The invention of claim 1 in which said compressors are hermetic shell compressors.
Claim 4
Dependent Claim
35 words
The invention of claim 1 in which said first compressor is a multiple cylinder compressor having means to controllably unload some of its cylinders for running part unloaded to reduce the capacity of the system.
Claim 5
Dependent Claim
13 words
The invention of claim 3 in which said compressors are hermetic shell compressors.
Claim 6
Dependent Claim
175 words
The invention of claim 4 in which multiple steps of variable capacity are provided with the inlet of said second compressor being connected to the system through the shell of said first compressor, and a multi-step capacity control comprising logic switch cycle control means responsive to refrigeration demand to cycle both compressors on for one capacity step corresponding to maximum capacity, to operate said first compressor unloading means to unload some of its cylinders while both compressors are cycled-on for a second capacity step of reduced capacity, to cycle-off said second compressor while at the same time operating said first compressor unloading means to not unload any of its cylinders and thereby cause only said first compressor to run at full capacity for a third capacity step of reduced capacity, and to cycle-off said second compressor and at the same time operate said first compressor unloading means to unload some of the cylinders of the first compressor while only the first compressor is running for a fourth capacity step of reduced capacity of the system.
Claim 7
Dependent Claim
201 words
The invention of claim 4 in which multiple steps of variable capacity are provided with the inlet of said second compressor being connected to the system through the shell of said first compressor, and a multi-step capacity control comprising logic switch cycle control means responsive to refrigeration demand to cycle both compressors on for one capacity step corresponding to maximum capacity, to operate said first compressor unloading means to unload some of its cylinders while both compressors are cycled-on for a second capacity step of reduced capacity, to cycle-off said second compressor and operate said valve control means to control said valve to be open while at the same time operating said first compressor unloading means to not unload any of its cylinders and thereby cause only said first compressor to run at full capacity for a third capacity step of reduced capacity, and to cycle-off said second compressor and operate said valve control means to control said valve to be open and at the same time operate said first compressor unloading means to unload some Of the cylinders of the first compressor while only the one compressor is running for a fourth capacity step of reduced capacity of the system.