Vortex compressor and refrigerator using ammonia-like as refrigrant

Abstract

The scroll compressor includes a scroll compression mechanism portion in combination of an orbiting scroll and a fixed scroll, a frame for supporting the compression portion, a rotary shaft fitted in the orbiting scroll, a motor portion coupled to the rotary shaft, and a hermetic chamber incorporating the above-mentioned components. Windings of a stator of a motor in the motor portion are formed of aluminum wires which are coated with fluororesin compound, that is, the aluminum wires are coated with fluororesin and is molded with a resin material. Ammonia group refrigerant is used in the scroll compressor. Further, a refrigerating system using the above-mentioned scroll compressor, is incorporated therein with a circuit for injecting ammonia group refrigerant into a compression room in the compression mechanism portion.

Description

technical field [0001] The present invention relates to a scroll compressor and a refrigerating device (such as an air conditioner or a refrigerating machine) using ammonia as a refrigerant and using ammonia as a refrigerant. Background technique [0002] Freon-based refrigerants used in the past will cause destruction of the earth's ozone layer and global warming, so people consider using natural refrigerants such as ammonia, but because ammonia is flammable and toxic, and its corrosiveness is also Strong, making copper wire or organic insulation not durable. [0003] In the existing compression device using ammonia refrigerant, the compression mechanism part and the motor part are combined with a connector, and a mechanical shaft seal device is used on the shaft of the compression mechanism part to prevent refrigerant from leaking between the shaft and the body. Cut off from the outside atmosphere. However, it is difficult to completely prevent the leakage of the refrige...

AI Technical Summary

Problems solved by technology

However, in hermetic compressors, the cooling of the motor part is difficult because a covering material to prevent the winding of the motor from being affected by ammonia and a molding for suppressing vibration are required.

In addition, the load torque pulsation on the machine side and the torque pulsation caused by the electromagnetic vibration assist force on the motor side interact to generate torsional vibration of the shaft, and there is a risk of burning the motor mechanism part due to this electromagnetic pulsation (vibration)

Furthermore, in the case of ammonia-based refrigerants, since the temperature of the discharged refrigerant is higher than that of conventional freon-based refrigerants, there is a danger of deteriorating the refrigerating machine oil, so it cannot be put into practical use at present.

[0006] In addition, when aluminum wires are used for the windings of the motor, since the aluminum wires are less conductive than copper wires, the heat generated by the motor windings increases, so there is a problem that the motor part becomes high temperature.

[0007] In addition, when using fluorine-containing resin as the coating material of the motor winding, the fluorine-containing resin has high peelability and non-adhesiveness, and the adhesion to the motor winding is poor, and there is a risk of burning the motor part.

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