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(11) | EP 1 020 692 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Air conditioning systems |
| (57) -An air conditioning system 100 may include a compressor 101 having a driving chamber
110, a cooling circuit 151, a heating circuit 152 and capacity controllers 301, 401.
The compressor 101 may have a suction port 115, a discharge port 120, a driving unit
130 provided within the driving chamber 110. The driving unit 130 decreases compressor
output discharge capacity when pressure within the driving chamber 110 increases.
The first capacity controller 301 and the second capacity controller 401 are provided
in parallel. Each capacity controller may communicate the discharge port 120 with
the driving chamber 110 respectively. This system may release high-pressure refrigerant
from the discharge port 120 into the driving chamber 110 when compressor suction pressure
results predetermined low-pressure state during operation of the cooling circuit.
As the result, the heat exchanger in the cooling circuit 151 is prevented from being
frosted. Further, the system may release high pressure refrigerant from the discharge
port 120 into the driving chamber 110 when compressor discharge pressure results predetermined
high-pressure state during operation of the heating circuit. As the result, the heating
circuit 152 is prevented from being damaged by an abnormally high discharge pressure. |