Method for joining heat exchanger tubes with headers
May 4, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3708012 Hot air furnace with improved heat exchanger construction Radiator tank headsheet and method Radiator tank headsheet and method Method of soldering tube to plate Flange weld technique Heat exchanger core construction utilizing a diamond-shaped tube-to-header joint configuration Method of making a heat exchanger Method for reinforcing by means of small plates at least end rows of tubes engaged into tube end plates for constituting a heat exchanger Patent #: 4813112 InventorsApplicationNo. 519534 filed on 05/04/1990US Classes:29/890.043, Tube joint and tube plate structure29/512, By flaring inserted cup or tube end29/890.052, Header or manifold making228/183Heat exchanger structureExaminersPrimary: Cuda, IreneAttorney, Agent or FirmInternational ClassB21D 053/06AbstractIn a method for joining a plurality of heat exchanger flat tubes with headers of a heat exchanger: each of the opposite end portions of the flat tubes has a cross section provided with a major axis and a minor axis; opposite major axis side walls of the cross section of each of opposite end portions of each of the flat tubes are obliquely cut off so as to form each of opposite minor axis side walls of the cross section of the end portion of the flat tube into a trapezoidal shape; the end portion of the flat tube is passed through an elliptical hole formed in the header; the end portion of the flat tubes thus passed through the header is flared over its entire peripheral wall; the thus flared end portion of the flat tube is then bent so as to be formed into a bent portion of the flat tube, which bent portion constitutes an essential part of a joint formed between the flat tube and the header; and the thus formed joint is dipped into a molten filler metal bath to form brazed or soldered portions around the joint.Field of SearchIncluding conduit expansion or inflationTube joint and tube plate structure Header or manifold making Heat exchanger or boiler making At cup or tube end By flaring inserted cup or tube end With manifold type header or header plate Inlet and outlet header means Heat exchanger structure Pressure vessels, tanks, and container-type structures | |
