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.

1 . A heat exchanger comprising:
 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 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;   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.   
     
     
         2 . The heat exchanger of  claim 1 , wherein each of the heat transfer cells has the weld lines along the first flanges of the heat transfer plates that are opposite to and in contact with each other in the mirror image, and the internal passage formed between the heat transfer plates that are opposite to each other so as to be parallel to the weld lines and having an inlet and an outlet defined by the second flanges that are opposite to and spaced apart from each other. 
     
     
         3 . The heat exchanger of  claim 2 , wherein each of the heat transfer cells has first slopes that are inclined toward the weld lines among the first flanges, the first or second heat transfer area, and the second flanges at a predetermined angle, and second slopes that are inclined toward the inlet and the outlet of the internal passage between the second flanges and the first or second heat transfer area at a predetermined angle so as to define the external recesses. 
     
     
         4 . The heat exchanger of  claim 3 , wherein the heat transfer assembly is configured so that the second flanges of the neighboring heat transfer cells which intersect with the internal passages at the right angle are in surface contact with each other, and that the first flanges of the neighboring heat transfer cells are spaced apart from each other, and includes end plates contacting the second flanges and the weld lines at opposite left-hand and right-hand ends of the first flanges. 
     
     
         5 . The heat exchanger of  claim 1 , wherein each of the heat transfer cells has the weld lines along the second flanges of the heat transfer plates that are opposite to and in contact with each other in the mirror image, and the internal passage formed between the heat transfer plates that are opposite to each other so as to be parallel to the weld lines and having an inlet and an outlet defined by the first flanges that are opposite to and spaced apart from each other. 
     
     
         6 . The heat exchanger of  claim 5 , wherein each of the heat transfer cells has first slopes that are inclined toward the inlet and the outlet of the internal passage among the first flanges, the first or second heat transfer area, and the second flanges at a predetermined angle at a predetermined angle so as to define the external recesses, second slopes that are inclined toward the weld lines between the second flanges and the heat transfer area at a predetermined angle, and end plates contacting the second flanges and the weld lines at opposite left-hand and right-hand ends of the first flanges. 
     
     
         7 . The heat exchanger of  claim 6 , wherein the heat transfer assembly is configured so that the second flanges of the neighboring heat transfer cells which intersect with the internal passages at the right angle are in surface contact with each other, and that the first flanges of the neighboring heat transfer cells are spaced apart from each other, and is sealed at opposite left-hand and right-hand ends of the second flanges by the end plates. 
     
     
         8 . The heat exchanger of  claim 1 , wherein one of the heat transfer plates includes a spacer set, a height of which is equal to or less than an interval between the neighboring heat transfer areas. 
     
     
         9 . The heat exchanger of  claim 8 , wherein the spacer set includes a plurality of stud spacers, a lower end of each of which is welded to one of the heat transfer areas so as to intersect with one of the heat transfer areas at a right angle. 
     
     
         10 . The heat exchanger of  claim 8 , wherein the spacer set includes a plurality of strip spacers, a lower end of each of which is welded to one of the heat transfer areas so as to intersect with one of the heat transfer areas at a right angle, and each of which extends in a flow direction of the fluid at a predetermined length. 
     
     
         11 . The heat exchanger of  claim 8 , wherein the spacer set includes a plurality of stud spacers, a lower end of each of which is welded to one of the heat transfer area so as to intersect with one of the heat transfer areas at a right angle, and a plurality of strip spacers, a lower end of each of which is welded to one of the heat transfer areas so as to intersect with one of the heat transfer areas at a right angle and each of which extends in a flow direction of the fluid at a predetermined length. 
     
     
         12 . The heat exchanger of  claim 8 , wherein the sealing panels include sealing plates facing the outer faces of the heat transfer assembly, reinforcing plates installed on outer surfaces of the sealing plates in a lattice shape, and fastening holes formed in corners of the sealing plates and fastened to ends of the support beams by fastening members. 
     
     
         13 . The heat exchanger of  claim 12 , wherein each of the sealing plates includes a glass coating layer on an inner surface thereof. 
     
     
         14 . The heat exchanger of  claim 12 , wherein the sealing panels and the support beams are coupled with a plurality of joint quadrilateral frames so as to be disposed at inlets and outlets of the first and second fluid passages. 
     
     
         15 . The heat exchanger of  claim 1 , wherein the first elastic members include plates having a predetermined length, bonded and fixed to inner surfaces of the sealing panels in contact with leading ends thereof and to the outer face of the heat transfer assembly in contact with trailing ends thereof, and having a contractile section having a curved cross section between the leading and trailing ends thereof. 
     
     
         16 . The heat exchanger of  claim 1 , wherein each of the second elastic members comprises an elastic plate, which has a predetermined length, which is bonded and fixed to a first lateral face of each of the support beams in contact with a leading end thereof and to the outer face of the heat transfer assembly in contact with a trailing end thereof, and which has a corrugated section between the leading and trailing ends thereof. 
     
     
         17 . The heat exchanger of  claim 16 , wherein the elastic support further includes stoppers, each of which has a predetermined length, is fixed to a second lateral face of each of the support beams, which is perpendicular to the first lateral face of each of the support beams on which the second elastic members are installed, and is opposite to an outer edge of the heat transfer assembly. 
     
     
         18 . The heat exchanger of  claim 1 , wherein the heat transfer assembly includes planar cover members spaced apart from and parallel to the heat transfer plates at a predetermined interval, so as to define another fluid passage between the heat transfer plates, through which, of the first and second fluids having different temperatures, one having a relatively low temperature flows. 
     
     
         19 . The heat exchanger of  claim 18 , wherein the cover members are installed on corners of the heat transfer plate where the inlet of the fluid passage through which the fluid having the relatively low temperature flows encounters with the outlet of the fluid passage through which the fluid having a relatively high temperature flows in a triangular shape.