Ammonia refrigerator
AssigneesHitachi, Ltd., Trustee for the Benefit of Hitachi Air Conditioning Systems, Co., Ltd.
InventorsYoshifumi Ichikawa, Makoto Ohtahara
Life of this patent
Estimating the term…
Abstract
A highly efficient and compact ammonia refrigerator, whose safety is further improved, is obtained. The ammonia refrigerator uses ammonia as refrigerant and has an ammonia refrigerating cycle in which a compressor, a condenser, an expansion valve, and an evaporator are connected through piping. The refrigerator comprises a casing in which the compressor and a motor for driving the compressor are accommodated and the refrigerant flows, a stator winding of the motor made of an aluminum wire, and a brine cooled by the refrigerant which is compressed in the casing and then evaporated in the evaporator.
Claims7
An ammonia refrigerator having a refrigerating cycle, in which a compressor, a condenser, an expansion valve and an evaporator are connected through piping, and using ammonia as refrigerant, comprising:
- a casing through which said ammonia refrigerant flows and which accommodates therein said compressor and an electric motor for driving said compressor, said electric motor having a stator winding made of aluminum system electric wires;
- a brine for exchanging heat with said refrigerant in said evaporator;
- and
- an inverter drive unit for controlling a capacity of said compressor in accordance with a flow rate of said brine;
- wherein said evaporator comprises a plate type heat exchanger, in which a plurality of plates are piled, and is so constructed that said ammonia refrigerant and said brine exchange heat with each other therein.
An ammonia refrigerator having a refrigerating cycle, in which a compressor, a condenser, an expansion valve and an evaporator are connected through piping, and using ammonia as refrigerant, comprising:
- a casing accommodating therein an electric motor for driving said compressor to be of a full-closed type or of a half-closed type;
- and
- a brine for exchanging heat with said refrigerant in said evaporator;
- said electric motor having a stator winding made of aluminum system electric wires, a volume of said electric motor or a sectional area of said stator winding thereof is made to be larger by 1.2 to 1.4 times as compared with a volume or a sectional area of a stator winding of an electric motor of the same capacity having the stator winding made of copper wires;
- wherein said evaporator comprises a plate type heat exchanger, in which a plurality of plates are piled, and is so constructed that said ammonia refrigerant and said brine exchange heat with each other therein.
An ammonia refrigerator having a refrigerating cycle, in which a compressor, a condenser, an expansion valve and an evaporator are connected through piping, and using ammonia as refrigerant, comprising:
- a casing accommodating therein said compressor and an electric motor for driving said compressor to be of a full-closed type or of a half-closed type;
- a brine for exchanging heat with said ammonia refrigerant in said evaporator;
- an inverter drive unit for controlling a capacity of said compressor in accordance with a flow rate of said brine;
- and
- said electric motor having a stator winding made of aluminum system wires, a volume of said electric motor or a sectional area of said stator winding thereof is made to be larger by 1.2 to 1.4 times as compared with a volume or sectional area of an electric motor of the same capacity having the stator winding made of copper wires;
- wherein said evaporator comprises a plate type heat exchanger, in which a plurality of plates are piled, and is so constructed that said ammonia refrigerant and said brine exchange heat with each other therein.
Dependencies are inferred from the claim text.