Automotive air conditioning apparatus

Pumps – With condition responsive pumped fluid control – Plural pump units with individual or relative control

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Details

623231, F04B 4908

Patent

active

053323670

ABSTRACT:
An automotive air conditioning apparatus includes an input shaft connected to an engine, a pump unit disposed on the input shaft, a compressor unit disposed on the input shaft, and a separator wall disposed between the pump unit and the compressor unit and adapted to seal therebetween in the axial direction of the input shaft. The pump unit includes a first short-circuiting passage communicating the suction space and the discharge space, and the first short-circuiting passage is provided with a first control valve. The compressor unit includes a second short-circuiting passage communicating the suction area and the discharge area, and the second short-circuiting passage is provided with a second control valve. When heating, the first short-circuiting passage is closed with the first control valve, and the second short-circuiting passage is opened with the second control valve to disable the compressor unit. When cooling, the first short-circuiting passage is opened with the first control valve to disable the pump unit, and the second short-circuiting passage is closed with the second control valve.

REFERENCES:
patent: 2766693 (1956-10-01), Wells
patent: 2832403 (1958-04-01), Erikson
patent: 4187694 (1980-02-01), Midalo

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