Self-clearing vacuum pump with external cooling for evacuating refrigerant storage devices and systems
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 13, 2001
Grant Date -
N/A
app pub date -
Feb 3, 2000
filing date -
Feb 3, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and system for fully evacuating refrigerant from storage devices, appliances, and refrigerant systems. An evacuation system is provided with a vacuum pump including a housing containing an electric motor positioned with its stator in heat conductive contact with the inner surfaces of the housing. The electric motor is used to drive a rotating-vane, rotary compressor that provides positive displacement suction on the device being evacuated of refrigerant. The vacuum pump further includes an external cooling system positioned about the housing to dissipate heat that builds up within the housing during periods of low refrigerant flow. The external cooling system includes tubular fins contained within a shell and held in abutting contact with an outer surface of the housing and a fan for forcing cooling air flow over and through the fins. During operation, the external cooling allows the motor and compressor to be used to obtain deep vacuums of 15 inches mercury vacuum and more within the device being evacuated.
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