Heat transfer apparatus

Claim 1

A heat transfer apparatus comprising: an evaporating chamber; a side wall of said evaporating chamber; two end face walls of said evaporating chamber; a vaporizer of capillary material permeable to a heat transfer fluid and arranged coaxially inside said evaporating chamber to maintain a thermal contact with a heat source; a first end cavity defined by one end surface of said vaporizer, said side wall and one of the two said end face walls of said evaporating chamber; a second end cavity defined by another end surface of said vaporizer, said side wall and the other of the two said end face walls of said evaporating chamber; a longitudinal axial passage arranged in said vaporizer and communicable with said first end cavity and said second end cavity; smooth annular projection provided on the outer surface of said vaporizer adjacent ends thereof to prevent the heat transfer fluid in a vapor phase from flowing into said first and second end cavities; a vapor header to collect the heat transfer fluid in a vapor phase arranged on the outer surface of said vaporizer; vapor release passages provided on the outer surface of said vaporizer interposed between said smooth annular projections defined by longitudinal recesses and a plurality of annular recesses intersecting with the longitudinal recesses, said vapor release passages being communicable with said vapor header; a condenser chamber; a first shell defining an outer wall of said condenser chamber; a second shell defining an inner wall of said condenser chamber, said second shell being secured inside said first shell coaxially therewith to form between the wall of said first shell and the wall of said second shell a space isolated from the outside, the cross-section of said space reducing in the direction of vapor travel path therealong; a first pipe connecting said vapor header to a zone of said condenser chamber containing the heat transfer fluid in a vapor phase; a second pipe connecting said evaporating chamber to a zone of said condenser chamber containing the heat transfer fluid in a liquid phase and passing inside said longitudinal axial passage; an inlet port of said second pipe communicable with said space in an area thereof having the least cross-section; an outlet port of said second pipe disposed inside said first end cavity of said evaporating chamber furtherst from said condenser chamber.