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:
Jan. 02, 2001
Filed:
May. 28, 1996
Neelkanth S. Gupte, Syracuse, NY (US);
Xin Liu, Syracuse, NY (US);
Steven J. Spencer, Liverpool, NY (US);
Robert H. L. Chiang, Manlius, NY (US);
Daniel Gaffaney, Chittenango, NY (US);
Carrier Corporation, Syracuse, NY (US);
Abstract
A heat transfer tube (,) for use in an application, such as a shell and tube type air conditioning system condenser, in which a fluid flowing through the heat exchanger external to the tubes condenses by transfer of heat to a cooling fluid flowing through the tubes. The tube has at least one fin convolution (,) extending helically around its external surface (,). A pattern of notches (,) extends at an oblique angle (&agr;) across the fin convolutions at intervals about the circumference of the tube. There is a spike (,) between each pair of adjacent notches. The fin convolution, notches and spikes are formed in the tube by rolling the wall of the tube between a mandrel and, first, a gang of finning disks (,) and, second, a notching wheel (,). Because, during the manufacture of the tube, of the interaction of the rotating and advancing tube and the notching wheel, the angle (&bgr;) of inclination of the axis of the tip of the spike is oblique with respect to the notch angle. The maximum width (W,) of the spike is greater than the width (W,) of the proximal portion of the fin convolution.