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US 5,207,072 AGranted
Unloading structure for compressor of refrigeration system
AssigneeRayco Enterprises, Inc.
InventorsRaymond P. Arno, Scott C. Carnes
Life of this patent
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AssigneeRayco Enterprises, Inc.
InventorsRaymond P. Arno, Scott C. Carnes
Estimating the term…
A refrigeration system including a compressor, condenser, thermal expansion valve, control for the thermal expansion valve, shell evaporator, suction line between the shell evaporator and compressor, and a control evaporator in the suction line between the shell evaporator and the control for the thermal expansion valve utilizing hot refrigerant gas from the compressor to heat the refrigerant in the suction line. The refrigeration system also includes an unloading arrangement for the compressor. In one arrangement a hot loop circuit is located directly between the outlet of the compressor and the inlet thereof and a cold loop circuit is located between the outlet and inlet of the compressor and which includes the evaporator, and both loops bypass the condenser and thus pass refrigerant from the compressor back to the compressor to thereby permit it to selectively operate in an unloaded condition in response to the load applied by the medium which is being cooled. An alternate and preferred arrangement for unloading the compressor includes a loop circuit between the outlet of the compressor and the inlet thereof which passes through an auxiliary evaporator under the main evaporator to thereby bypass the condenser and thus unload it in response to the load applied by the medium being cooled.
A refrigeration system comprising a compressor having a compressor outlet and an inlet, a condenser, first conduit means coupling said compressor outlet to said condenser, an evaporator, second conduit means coupling said condenser to said evaporator, refrigerant expansion means in said second conduit means, third conduit means coupling said evaporator to said inlet of said compressor, refrigerant and oil circulated through said system by said compressor, and unloading means for unloading said compressor without overheating while permitting it to continue running, said unloading means comprising fourth conduit means coupled between said first conduit means and said compressor inlet for passing hot gas from said compressor back to said compressor inlet, cooling means for cooling said hot gas in said fourth conduit means to thereby cool said hot gas passing into said compressor inlet from said fourth conduit means, and control means for selectively effecting passage of gases from said compressor through said fourth conduit means in response to the necessity for unloading said compressor to cause said refrigeration system to stop producing refrigeration, said cooling means comprising means for placing said hot gas in said fourth conduit means in heat exchange relationship with liquid refrigerant which also flows through said evaporator.
A refrigeration system comprising a hermetic compressor having a compressor inlet, a condenser, first conduit means coupling said hermetic compressor to said condenser, an evaporator having an inlet and an outlet, second conduit means coupling said condenser to said evaporator, refrigerant expansion means in said second conduit means, third conduit means coupling said evaporator to said inlet of said hermetic compressor, refrigerant and oil circulated through said system by said compressor, and unloading means for unloading said hermetic compressor without overheating while permitting it to continue running, said unloading means comprising fourth conduit means coupled between said first conduit means and said compressor inlet for passing hot gas from said hermetic compressor directly back to said hermetic compressor, and fifth conduit means coupled from said first conduit means to at least one of said inlet and outlet of said evaporator to cause hot gas from said first conduit means to be cooled after passage from said fifth conduit means to thereby cool said hot gas passing into said compressor inlet from said fourth conduit means, and control means for selectively effecting passage of gases from said compressor through said fourth and fifth conduit means in response to the necessity for unloading said compressor to cause said refrigeration system to stop producing refrigeration.
Dependencies are inferred from the claim text.