The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 1993
Filed:
Jun. 01, 1992
Shrikant M Joshi, Cambridge, MA (US);
General Motors Corporation, Detroit, MI (US);
Abstract
Heat exchanger with double row tubes with each tube being substantially identical and made by a sequence of roll forming operations from a single piece blank so that it has a centralized vertical connector web of the thickness of the blank connecting and supporting opposite side walls of the tubes to separate each tube into separate flow passes for augmenting tube burst strength from high internal pressures. Also, the vertical connector web effectively eliminates tube crushing from compression loads exerted onto a core of tubes and corrugated air centers by retainer bands used to hold these components together for their subsequent brazing together in a high temperature oven to form a core. With these tubes employed, heat exchanger efficiency is improved since the apices of the air centers have extensive direct contact with the flat sides of the roll formed tubes thoughout their widths. The tubes of this invention are formed with effective and efficient usage of all material of the blank and have continuous and even peripheries for improved brazing to header plates or end tanks facilitating the manufacture of high capacity heat exchangers with reduced weight. After being brazed and employed in a heat exchanger, heat energy is transferred by conduction from the heat exchanger fluid to the tubes and then directly to the air centers.