Patent ID: 7789127

Claim:
A heat transfer tube for an evaporator, comprising: a tube body; a plurality of outer fins extending on an outer wall surface of the tube body and having outer fin walls opposite to the outer fin walls of any adjacent outer fin; a channel located between adjacent fins so as to constitute a channel chamber; a fin top platform on each of the respective tops of the outer fins, the fin top platform including fin top edges which extend from both sides of the fin top platform so that the channel chambers located between adjacent fins form a cavity structure as a whole; each channel chamber having openings constituted by gaps between the adjacent fin top edges of the fin top platforms of the outer fins; and a lateral fin arranged on a portion or a substantially middle portion of each of the outer fin walls of the outer fins in a height direction of the outer fins and at intervals in a spreading direction of the outer fins so that the cavity structure is formed into a double cavity structure.