HEAT EXCHANGER AND METHOD FOR MANUFACTURING HEAT EXCHANGER

摘要

A clearance (C) is provided between the inner circumferential surface of cylindrical stubs (22) (which protrude toward the outlet-side and inlet-side water chambers (14, 15) of outlet-side and inlet-side tube plates (11a, 11b)) and the outer circumferential surface at the end part of heat transfer tubes (12) inserted into the stubs (22), and the end faces of the inside tube parts (24a) and the outside tube parts (24b) of grooved end pieces (24) are laser-welded to the end faces of the heat transfer tubes (12) and the stubs (22) from the inner-surface side of the heat transfer tube (12), with the weld height of the end faces of the outside tube parts (24b) and the end faces of the stubs (22) and the weld height of the end faces of the inside tube parts (24a) and the end faces of the heat transfer tubes (12) corresponding to each other, thereby enabling butt-welding to be performed in one pass.

主权项

1. A heat exchanger comprising:
a heat transfer tube provided between tube plates, wherein a clearance is provided between an inner circumferential surface of a cylindrical stub protruding toward the water chamber side of each of the tube plates and an outer circumferential surface of an end portion of the heat transfer tube which is inserted into the stub, and inside and outside end faces of a ring-shaped and grooved end piece are butt-welded to end faces of the heat transfer tube and the stub with the outside end face made to correspond to the end face of the stub and the inside end face made to correspond to the end face of the heat transfer tube.