Method for producing a plate heat exchanger using two welds, and a corresponding plate heat exchanger

Patent metadata

Field	Value
Publication number	US-2017307306-A1
Application number	US-201515516901-A
Country	US
Kind code	A1
Filing date	Oct 20, 2015
Priority date	Oct 23, 2014
Publication date	Oct 26, 2017
Grant date	—

Abstract

A method for producing a plate heat exchanger and the plate heat exchanger, particularly a soldered aluminium plate heat exchanger. In the method, a heat exchanger block is provided having a plurality of partition plates and edge strips arranged between the partition plates. A connection device is provided to be mounted on the heat exchanger block. A planar region for securing the connection device to the heat exchanger block is provided with at least one welded weld bead by means of a first weld. The connection device is welded onto the weld bead by means of a second weld. The welding method used for the first weld is a friction stir welding method.

First claim

1 . A method for producing a plate heat exchanger, in which:
a heat exchanger block comprising a number of parting sheets and edge bars arranged in between is provided, a connection device to be attached to the heat exchanger block is provided, a planar region intended for fixing the connection device to the heat exchanger block is provided with at least one welding bead by means of a first welding, and the connection device is welded onto the welding bead by means of a second welding,
characterized in that the welding method by which the first welding is performed is a friction stir welding method.

2 . The method for producing a plate heat exchanger as claimed in claim 1 , characterized in that unevennesses of the planar region intended for fixing the connection device to the heat exchanger block are at least partially evened out by means of the first welding.

3 . The method for producing a plate heat exchanger as claimed in claim 1 , characterized in that brazing inhomogeneities between parting sheets and edge bars are at least partially eliminated by means of the first welding.

4 . A plate heat exchanger, in particular an aluminum plate heat exchanger, comprising a heat exchanger block having a number of parting sheets and edge bars arranged in between, and a connection device, between the heat exchanger block and the connection device there being at least one welding bead, welded onto the heat exchanger block by means of a first welding, and the connection device being connected in welding terms with the welding bead by means of a second welding, characterized in that the welding bead is welded by means of friction stir welding.

5 . The plate heat exchanger as claimed in claim 4 , characterized in that the silicon content and/or the magnesium content of the welding bead produced by means of the first welding is greater or less than 0.5% to 1.5%.

6 . The plate heat exchanger as claimed in claim 4 , characterized in that the welding bead has a welding filler.

7 . The plate heat exchanger as claimed in claim 4 , characterized in that the plate heat exchanger is a brazed plate heat exchanger.

Assignees

• Linde Ag

Inventors

• Aigner Herbert
• Wimmer Georg
• Wimmer Richard

Classifications

• F28D9/0062

  the conduits for one heat-exchange medium being formed by spaced plates with inserted elements (F28D9/0012, F28D9/0025, F28D9/0081, F28D9/04 take precedence) · CPC title

• F28F2275/06

  by welding · CPC title

• F28F2275/04

  by brazing · CPC title

• F28F2275/062

  by impact pressure or friction welding · CPC title

• F28F3/08 Primary

  Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning · CPC title