Patent ID: 6314749
Filing Date: 2001-11-13
Classification: F04B,F25B

Abstract:
A refrigerant vacuum pump with improved cooling for pumping refrigerant from a refrigerant device containing refrigerant to a predetermined evacuation pressure level within the refrigerant device, said vacuum pump comprising:(a) a sealable housing fabricated from thermally conductive material, said housing having a refrigerant inlet for receiving refrigerant from the refrigerant device at an inlet pressure;(b) a refrigerant compressor positioned within said housing and connected to said refrigerant inlet;(c) an electric motor for driving said refrigerant compressor positioned within said housing with a portion of said electric motor contacting an inner surface of said housing to provide a heat transfer path between said electric motor and an outer surface of said housing;(d) a cooling system external to said housing adapted for dissipating heat transferred from said electric motor to said heat transfer path, said cooling system being in heat-conductive contact with said outer surface of said housing;(e) wherein said cooling system includes a heat transfer element positioned along the periphery of said housing and in heat-conductive contact with said outer surface of said housing and a fan to force a cooling gas to flow over said heat transfer element;(f) wherein said heat transfer element comprises a plurality of fins fabricated from thermally conductive material; said fins are tubes being selected from the group of round, oval, and flat tubes.