Patent ID: 7284595

Claim:
An air conditioning heat exchanger comprising: a heat exchanger main body having a core formed by a plurality of tubes through which a heat source fluid passes and a plurality of fins joined to said tubes, the heat exchanger main body further having an inlet tank connected to one of the ends of said tubes in a longitudinal direction, for distributing said heat source fluid to said plurality of tubes and an outlet tank connected to the other end of said tubes in the longitudinal direction, for gathering said heat source fluid from said plurality of tubes, the heat exchanger main body executing heat exchange between air and the heat source fluid, the heat exchanger main body is of a full-path-type in which the heat source fluid flows unidirectionally from the inlet tank towards the outlet tank while passing through the plurality of tubes; a single piece fixed fluid distribution pipe having a fixed fluid inlet pipe and a fixed fluid outlet pipe; a single piece rotary fluid distribution pipe having a rotary fluid inlet pipe in communication with the inlet tank of the heat exchanger main body and the fixed fluid inlet pipe and a rotary fluid outlet pipe in communication with the outlet tank of the heat exchanger main body and the fixed fluid outlet pipe for causing said heat source fluid to flow into and out of said heat exchanger main body; wherein said fluid inlet pipes and said fluid outlet pipes forming a coaxial double-piping structure; said fixed fluid inlet pipe and said fixed fluid outlet pipe comprises a fixed inner pipe and a fixed outer pipe larger in diameter than said fixed inner pipe, said fixed outer pipe being disposed closer to a side of said heat exchanger main body than said fixed inner pipe; said rotary fluid inlet pipe and said rotary fluid outlet pipe comprises a rotary inner pipe and a rotary outer pipe larger in diameter than said rotary inner pipe, said rotary inner pipe and said rotary outer pipe are arranged a predetermined distance from said side of the heat exchanger main body; an inside diameter of said fixed inner pipe continues to an inside diameter of said rotary inner pipe and an inside diameter of said fixed outer pipe continues to an inside diameter of said rotary outer pipe; said rotary outer pipe communicates with said fixed outer pipe and said rotary inner pipe communicates with said fixed inner pipe; said heat exchanger main body is so constituted as to be capable of rotating with a center axis of said coaxial double-piping structure as the center; a communication pipe disposed outside of the tubes communicates the rotary outer pipe with one of the inlet and outlet tanks; and the fixed inner pine, the rotary inner pipe and the other of the inlet and outlet tanks are coaxially arranged and these three communicate with each other.