Rotary expansible chamber devices – Multistage – Sliding abutment
Patent
1993-07-09
1994-06-21
Bertsch, Richard A.
Rotary expansible chamber devices
Multistage
Sliding abutment
418 60, 418212, F01L 130
Patent
active
053224248
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a coolant compressor incorporating a two stage compressing function, and in particular to an enhancement in compression efficiency by improving the compression timing between a low stage compression element and a high stage compression element.
These years, in the field of refrigerators, studies for materializing a coolant compressor which is suitable for high compression ratio operation, as a part of insurance of a low temperature heat source and a high temperature heat source, have been prosperous.
Particularly, several kinds of multi-stage rotary type compressors have been proposed in order to enhance the compression efficiency by decreasing the pressure differential between a compression chamber and a suction chamber so as to reduce the volume of leakage gas under compression (Japanese Patent Unexamined Publication No. 50-72205).
Specifically, a rolling type rotary two stage compressor and a two stage compression/two stage expansion refrigerating cycle system configuration connected thereto with the former compressor has been proposed as shown in FIGS. 11 to 13 (Japanese Patent Unexamined Publication No. 50-72205).
In these figures, a drive motor 1005 is disposed in the upper part of a closed container 1003 while a compression mechanism coupled to a rotary shaft 1005c of the drive motor 1005 and composed of two upper and lower stages (a low pressure stage compression mechanism 1007 as the upper stage and a high pressure stage compression mechanism 1009 as the lower stage) is disposed in the lower part of the closed container, and an oil sump is disposed in the bottom part thereof, the back surface of a vane 1007c (1009c) which partitions each of cylinders of the low pressure stage compression mechanism 1007 and the high pressure stage compression mechanism 1009 into a suction chamber and a compression chamber being communicated with the internal space of the closed container 1003, and a back pressure urging force applied to the vane 1007c (1009c) being given by a reaction force of a spring device and a pressure in the closed container 1003.
Coolant gas discharged from the lower pressure stage compression mechanism 107 flows into an external gas-liquid separator 1017 through a discharge pipe 1007e, and then again flows into the internal space of the closed container 1003 through a communication pipe 1009d' so as to cool the motor 1005.
Discharged coolant gas having flown again into the closed container 1003 sucks up lubrication oil in the bottom part of the closed container 1003 when it flows through a suction pipe 1009d connected thereto with an oil suction pipe 1023 in order that the lubrication oil is used for cooling a slide surface and for sealing a gap in the compression chamber.
Discharged coolant gas recompressed by the high pressure stage compression mechanism 1009 is fed into an external condenser 1013 through a discharge pipe 1009e, and then returns again into the low pressure stage compression mechanism 1007 through a suction pipe 1007d by way of a first expansion valve 1015, the gas-liquid separator 1017, a second expansion valve 1019 and an evaporator 1021.
Further, in order to improve torque variation which is large during compression and which is one of disadvantages inherent to the rolling piston type rotary two stage compressor, the directions of eccentricity of crank parts of the rotary shaft 1005c are shifted from each other by an angle of 180 deg., and the directions of attachment of the vanes (1007c, 1009c) of both compression mechanisms (low pressure stage compression mechanism 1007 and high pressure stage compression mechanism 1009) are shifted between the high and low pressure stage sides by an angle of 75 to 80 deg, as will be explained hereinbelow although it is not shown in the drawings showing this example. That is, a countermeasure for reducing the torque variation in comparison with a rotary type first stage compressor has been proposed.
The two stage compression refrigerating cycle is constituted by the arrangement of the
REFERENCES:
patent: 4726739 (1988-02-01), Saitou et al.
patent: 5242280 (1993-09-01), Fujio
Bertsch Richard A.
Freay Charles
Matsushita Electric - Industrial Co., Ltd.
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