Welded plate heat exchanger

Abstract

The invention relates to a welded plate heat exchanger, comprising a heat conduction assembly formed by stacking a plurality of unit heat conduction plates in an up-and-down direction. The unit heat conduction plates face each other and are arranged with a first heat conduction surface and a second heat conduction surface; 1. A first flow channel is formed between two heat conduction surfaces, and a second flow channel is alternately formed between adjacent unit heat conduction plates; at least one first anti-expansion part is formed on the first heat conduction surface; at least one is formed on the second heat conduction surface One second anti-expansion part; when stacking unit heat conduction plates, the upper part of the first anti-expansion part and the lower part of the second anti-expansion part adjacent to the upper side are fitted in surface contact with each other; the upper part of the second anti-expansion part and The lower parts of the adjacent upper first anti-expansion parts are fitted in face-to-face contact with each other to fix the stacked unit heat transfer plates, so the frictional force is maximized by mutual face-to-face contact, and the pressure resistance of the welded plate heat exchanger can be improved. sex.

Description

technical field [0001] The present invention relates to a plate heat exchanger, and more specifically to a welded plate heat exchanger formed by stacking heat transfer plates welded by seam welding or the like. Background technique [0002] Generally, heat exchangers are used to transfer heat from one fluid to another without physical contact. That is, it is a device that only transfers heat without mixing fluids, and it is a device used when indirectly heating or cooling a fluid. [0003] In the past, shell and tube (shell & tube) type heat exchangers were mainly used, but recently, compact plate heat exchangers excellent in heat transfer performance are mainly used. [0004] Because of high heat transfer performance, light weight, and economical reasons, plate heat exchangers are also introduced in power plants and factory facilities. For this reason, plate heat exchangers with durability are required to overcome high operating pressure (15 ~35bar) and high operating tem...

AI Technical Summary

Problems solved by technology

[0008] However, when a high-pressure fluid flows inside a welded plate heat exchanger that is long in the longitudinal direction, the expansion protrusion at the center of the heat transfer surface is deformed, and the outer shell and both ends of the heat transfer surface are welded to each other. Problems with cracks in some parts

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