ALUMINUM REFRIGERANT TUBE CONNECTION STRUCTURE

The present invention relates to an aluminum refrigerant tube connection structure and, more particularly, to an aluminum refrigerant tube connection structure configured such that tube expansion portions of an aluminum refrigerant tube and an inner sleeve are expanded to be bent twice, and the tube expansion portion of the refrigerant tube is tightened, without rupturing, by fastening a fastener and a connection body. The aluminum refrigerant tube connection structure according to the present invention comprises: a connection body, which is a tube body having a through-hole formed at the center so as to penetrate the same in the longitudinal direction, which has a bolt portion formed on the outer surface thereof, and which has an inner pressurization surface formed in a tapered shape, the outer diameter of the inner pressurization surface gradually decreasing from the front of the bolt portion towards the front end; a fastener, which is a tube body having a through-hole formed at the center so as to penetrate the same in the longitudinal direction, a nut portion being formed on the inner surface of the fastener and screw-coupled to the bolt portion of the connection body, and an outer pressurization surface being formed in a tapered shape, the inner diameter of the outer pressurization surface gradually decreasing from the front of the nut portion towards the front so as to correspond to the inner pressurization surface of the connection body; an aluminum refrigerant tube having a tube expansion portion formed in a tapered shape, the diameter of the tube expansion portion increasing towards an end, such that the same is fitted between the inner pressurization surface and the outer pressurization surface; an inner sleeve having an outer surface inserted into an end entrance of the aluminum refrigerant tube so as to contact the inner surface of the aluminum refrigerant tube, an inner gasket portion being formed on an end portion of one side thereof and expanded so as to correspond to the tube expansion portion of the aluminum refrigerant tube; and an outer sleeve, into which the end portion of the aluminum refrigerant tube is inserted such that the inner surface of the outer sleeve contacts the outer surface of the aluminum refrigerant tube, an outer gasket portion being formed on an end portion of the outer sleeve and expanded so as to correspond to the tube expansion tube of the aluminum refrigerant tube. The tube expansion portion of the aluminum refrige