Pumps – Condition responsive control of pump drive motor – By stopping pump in response to leakage into or from system
Patent
1991-04-23
1993-03-09
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
By stopping pump in response to leakage into or from system
417 44, 417 53, 310 88, F04B 4902
Patent
active
051921944
ABSTRACT:
An explosion proof compressor and method for explosion proofing a compressor for use with air conditioning or refrigeration system in a hazardous location where flammable gases or vapors may exist places the electrical supply terminals for the compressor within a gas tight housing which is pressurized with low pressure refrigerant gas being compressed by the compressor. The gas tight housing is in a fluid-transmitting relationship with a pressure responsive switch, whereby upon a pre-selected decrease in the pressure within the gas tight housing, the pressure responsive switch terminates the supply of electrical power to the compressor motor.
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"NFPA 496: Purged and Pressurized Enclosures For Electrical Equipment"; 1989 Edition; National Fire Protection Association.
Air Engineers, Inc.
Bertsch Richard A.
Scheuermann David W.
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