초록 ▼

In a preferred embodiment, a single motor drives both oil and refrigerant pumps in a refrigeration chiller, the motor and oil pump being disposed in the chiller's oil supply tank and the refrigerant pump being disposed exterior thereof. The refrigerant pump pumps liquid refrigerant to the chiller's

In a preferred embodiment, a single motor drives both oil and refrigerant pumps in a refrigeration chiller, the motor and oil pump being disposed in the chiller's oil supply tank and the refrigerant pump being disposed exterior thereof. The refrigerant pump pumps liquid refrigerant to the chiller's compressor section so as to cool the motor by which the compressor is driven while the oil pump pumps oil to chiller locations that require lubrication when the chiller is in operation. A uniquely designed impeller permits low pressure liquid refrigerant in its liquid state to be reliably pumped to a location of use, without significant flashing, from a source location which is at a height only a short distance above the pump inlet. A stand alone refrigerant pump embodiment is also described.

대표청구항 ▼

[ What is claimed is:] [1.] A refrigeration chiller comprising:a condenser;a metering device, said metering device receiving refrigerant from said condenser;an evaporator, said evaporator receiving refrigerant from said metering device;a compressor, said compressor receiving refrigerant gas from sai

[ What is claimed is:] [1.] A refrigeration chiller comprising:a condenser;a metering device, said metering device receiving refrigerant from said condenser;an evaporator, said evaporator receiving refrigerant from said metering device;a compressor, said compressor receiving refrigerant gas from said evaporator at a first pressure and delivering refrigerant gas at a second, higher pressure to said condenser, said condenser, said metering device, said evaporator and said compressor defining a refrigeration circuit;a low pressure refrigerant, said low pressure refrigerant flowing through said refrigeration circuit when said chiller is in operation;a motor for driving said compressor; anda pump, said pump pumping said low pressure refrigerant, when said refrigerant is in its liquid state, from a location in said refrigeration circuit into contact with said compressor drive motor in order to cool said motor, said pump being a centrifugal pump having a housing, an impeller, and a motor for driving said impeller, said impeller being disposed in said housing, having an inlet portion and having a plurality of vanes, liquid refrigerant received in said inlet portion of said impeller transitioning from flow in an axial direction to flow in a radial direction prior to the interaction of such refrigerant with the leading edges of said plurality of vanes.