SERVICE UNIT FOR VEHICLE AIR-CONDITIONING SYSTEMS AND METHOD FOR REMOVING THE COOLANT OR A COOLANT/COMPRESSOR OIL MIXTURE FROM A VEHICLE AIR-CONDITIONING SYSTEM
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United States of America Patent
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Issued Date -
Aug 15, 2013
app pub date -
Sep 14, 2011
filing date -
Sep 14, 2010
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Abstract
The invention relates to a service unit for vehicle air-conditioning systems, which is provided with an emptying and filling device for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system and replenishing the vehicle air-conditioning system with coolant and optionally with compressor oil. The device can include at least one tank for coolant and a vacuum pump for generating a negative pressure in the vehicle air-conditioning system emptied of coolant or coolant/compressor oil mixture for a subsequent intake of coolant and optionally compressor oil into the vehicle air-conditioning system to be replenished. A chimney-like gas-collecting chamber having upper and lower openings can be arranged inside the service unit and is otherwise sealed off from the surrounding atmosphere.
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