US 4,915,163 A · Plate type heat exchanger

Abstract

A plate type heat exchanger has a plurality of tube units and a plurality of corrugated fins. Each of the tube units is formed by a pair of plates, namely a pair of plates are connected to each other by a brazing material at a connecting portion at an outer periphery of the plate and a center rib at a center axis of the plate. The center rib has an enlarged portion at the top end thereof in order to gather the molten brazing material toward the enlarged portion. The brazing at the center rib is started from the enlarged portion. Therefore a brazing defect is prevented from occurring at the top end of the center rib. Since the tube unit is effectively connected by brazing, the tube unit of the present invention has enough anti-pressure strength.

Claims7

Dependent claims

A plate type heat exchanger comprising:

a plurality of tube units having an inlet tank portion, a passage portion and an outlet tank portion, with a plurality of corrugated fins provided between adjacent pairs of said tube units, wherein;
each of said tube units is formed by a pair of plates,
each of said plates has a connecting portion at a periphery thereof and an elongated center rib disposed along the center axis thereof so that said pair of plates are connected to each other by brazing material at said connecting portion said center rib having a bottom end contiguous with said connecting portion and a top end opposite said bottom end, wherein said center rib, and
the width at the top end of said center rib is in the range from 1.2 times to twice the width at the remaining portion of said center rib so as to form an enlarged portion at the top end of said center rib.

1 more element

Dependencies are inferred from the claim text.

Plate type heat exchanger

Life of this patent

Plate type heat exchanger

Life of this patent

Abstract

Claims7