Plate type heat exchanger

Abstract

A plate type heat exchanger includes a heat transfer assembly having a plurality of heat transfer cells stacked in multiple layers, first fluid passages, and second fluid passages between the heat transfer cells so as to intersect with the first fluid passage at a right angle and to exchange heat with the first fluid passages, a framework having a plurality of support beams connected between a pair of sealing panels facing opposite outer faces of the heat transfer assembly, and an elastic support having first elastic members installed between the sealing panels and the heat transfer assembly and second elastic members installed between the support beams and the heat transfer assembly, absorbing thermal expansion of the heat transfer assembly, and preventing fluids from leaking out.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a plate type heat exchanger, and more particularly, to a plate type heat exchanger, capable of simply and rapidly fabricating a heat transfer assembly to improve workability by bending a pair of heat transfer plates, by welding a pair of heat transfer plates into a heat transfer cell, and by stacking and welding the heat transfer cells in multiple layers, preventing the flaw of welding caused by downward sagging of the heat transfer plate when the welding is performed, reducing the total number of constituent parts and thus production costs, and improving assemblability.[0003]2. Description of the Related Art[0004]In general, heat exchangers are fluid-to-fluid heat recovery apparatuses that recover heat included in gases discharged to the outside in industrial facilities such as air-conditioning facilities and then supply the recovered heat to productive facilities or interiors of buildi...

AI Technical Summary

Benefits of technology

[0012]Embodiments of the present invention provide a plate type heat exchanger capable of simply and rapidly fabricating a heat transfer assembly to improve workability by bending a pair of heat transfer plates, by welding the pair of heat transfer plates into a heat transfer cell, and by stacking and welding the heat transfer cells in multiple layers, of preventing the flaw of welding caused by downward sagging of the heat transfer plate when the welding is performed, minimizing turbulence at an inlet into which a fluid flows to improve heat exchange efficiency, reducing the total number of constituent parts and thus production costs, and improving assemblability.

[0013]According to an aspect of the present invention, the heat exchanger includes a heat transfer assembly including a plurality of heat transfer cells stacked in multiple layers, each of the heat transfer cells including a pair of heat transfer plates, wherein each of the heat transfer plates has a pair of first flanges bent from a heat transfer area shaped of a quadrilateral panel in one direction and a pair of second flanges bent from the heat transfer area in a direction opposite the bending direction of the first flanges; wherein each of the heat transfer cells has weld lines formed along one of the first and second flanges of the heat transfer plates disposed so as to be opposite to each other in a minor image, an internal passage between the weld lines, and external recesses outside the heat transfer areas so as to intersect with the internal passage at a right angle; wherein the heat transfer assembly has first fluid passages, each of which is formed by the internal passage, and second fluid passages between the heat transfer cells to intersect with the first fluid passage at a right angle so as to exchange heat with the first fluid passages; a framework having a plurality of support beams connected between a pair of sealing panels facing opposite outer faces of the heat transfer assembly; and an elastic support having first elastic members installed between the sealing panels and the heat transfer assembly and second elastic members installed between the support beams and the heat transfer assembly, absorbing thermal expansion of the heat transfer assembly, and preventing fluids from leaking out.

[0032]According to the exemplary embodiments of the present invention, the heat transfer cell is fabricated by welding a pair of heat transfer plates disposed so as to be opposite to each other in a mirror image to thereby form weld lines along one of first and second flanges of the heat transfer plates disposed so as to be opposite to each other in a mirror image, an internal passage between the weld lines, and external recesses outside the heat transfer areas so as to intersect with the internal passage at a right angle. The heat transfer assembly is fabricated by stacking a plurality of heat transfer cells in multiple layers to thereby form first fluid passages, each of which serves as the internal passage, and second fluid passages between the heat transfer cells so as to intersect with the first fluid passages at a right angle and to exchange heat with the first fluid passages. The elastic support is installed between the sealing panels facing opposite outer faces of the heat transfer assembly and the heat transfer assembly and between the support beams provided between the sealing panels and the heat transfer assembly, thereby absorbing thermal expansion of the heat transfer assembly and preventing fluids from leaking out. Thereby, the heat exchanger can simply and rapidly fabricated, prevent the flaw of welding when welding is performed, reducing a burden of the welding to improve workability, reducing the total number of constituent parts and thus production costs, and improving assemblability.

[0033]Further, the heat exchanger can minimize turbulence and resistance of the fluid occurring at the inlets of the fluid passages of the heat transfer assembly, and thereby stably maintain contact between the fluid and the heat transfer plate as the heat transfer member to improve heat exchange efficiency.

Problems solved by technology

For this reason, when a worker individually welds the parallel plates, a high precision of welding is required, which increases a working burden of the worker.

Further, when the parallel plates are disposed and welded in a horizontal direction, the parallel plates sagging downwards due to their weights cause the flaw of welding.

For this reason, a contact area between the plate as the heat transfer member and the fluid is relatively reduced, and thus heat exchange efficiency is reduced.

Further, the total number of parts constituting the conventional plate type heat exchanger is much, and thus processes of welding or joining these parts are very complicated, which increases production costs and reduces workability.

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