HEAT EXCHANGER

• US 20120037346A1
• Filed: 04/20/2010
• Published: 02/16/2012
• Est. Priority Date: 04/20/2009
• Status: Active Grant

• Current Assignee: Kyungdong Navien Co., Ltd.
• Original Assignee: Kyungdong Navien Co., Ltd.
• Inventors: Choi, Young Sik, Kim, Young Mo
• Granted Patent: US 9,250,021 B2
• Time in Patent Office: Days
• US Class Current: 165/149
• CPC Class Codes: F24H 1/38 with water contained in separate elements, e.g. radiator-type element
• CPC Class Codes: F28D 1/05358 Assemblies of conduits connected side by side or with individual headers, e.g. section type radiators
• CPC Class Codes: F28D 1/05366 Assemblies of conduits connected to common headers, e.g. core type radiators
• CPC Class Codes: F28D 7/1623 with particular pattern of flow of the heat exchange media, e.g. change of flow direction
• CPC Class Codes: F28D 7/1692 with particular pattern of flow of the heat exchange media, e.g. change of flow direction
• CPC Class Codes: F28D 9/0081 the conduits for one heat-exchange medium being formed by a single plate-like element F28D9/0012 takes precedence; the conduits for one heat-exchange medium being integrated in one single plate-like element F28D9/0012 takes precedence
• CPC Class Codes: F28F 1/04 polygonal, e.g. rectangular F28F1/022 takes precedence
• CPC Class Codes: F28F 1/06 crimped or corrugated in cross-section
• CPC Class Codes: F28F 1/42 the means being both outside and inside the tubular element
• CPC Class Codes: F28F 1/426 the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
• CPC Class Codes: F28F 13/06 by affecting the pattern of flow of the heat-exchange media F28F13/003 takes precedence; static flow control means in header boxes F28F9/026

Abstract

The preset invention relates to a heat exchanger in which heat transfer between heating water passing through the inside of heat exchanging pipes and combustion gas is efficiently performed. The heat exchanger includes: a plurality of heat exchanging pipes, each of which has an end with an open flat tube-type cross-sectional surface, and through the inside of each of which heating water passes; a first fixing plate and a second fixing plate, each of which has pipe insertion holes formed at a predetermined spacing in the lengthwise direction of the plate, such that both ends of the plurality of heat exchanging pipes are inserted into the respective pipe insertion holes; a first parallel flow channel cap and a second parallel flow channel cap fixed at the respective first fixing plate and second fixing plate to close both ends of the heat exchanging pipes and thus form a parallel flow channel; a heating water inlet connected to the first parallel flow channel cap; and a heating water outlet connected to either the first or second parallel flow channel caps. The cross-section of each of the heat exchanging pipes has protrusions and recessions alternately arranged in the width direction of the heat exchanging pipe, so as to extend the flow path of the combustion gas passing through between the heat exchanging pipes.

Claims

1. A heat exchanger comprising:

a plurality of heat exchanging pipes, each of which has an end with an open flat tube-type cross-sectional surface, and through the inside of each of which heating water passes;

a first fixing plate and a second fixing plate, e ach of which has pipe insertion holes formed at a predetermined spacing in the lengthwise direction of the plate, such that both ends of the plurality of heat exchanging pipes are inserted into the respective pipe insertion holes;

a first parallel flow channel cap and a second parallel flow channel cap fixed at the respective first fixing plate and second fixing plate to close both ends of the heat exchanging pipes and thus form a parallel flow channel;

a heating water inlet connected to the first parallel flow channel cap; and

a heating water outlet connected to either the first or second parallel flow channel caps,

wherein the cross-section of each of the heat exchanging pipes has protrusions and recessions alternately arranged in the width direction of the heat exchanging pipe, so as to extend the flow path of the combustion gas passing through between the heat exchanging pipes.

2. The heat exchanger according to claim 1, wherein the heat exchanging pipes have a plurality of protrusions that are spaced in the length direction of the heat exchange pipes and protrude in the width direction of the heat exchange pipes and the protrusions of adjacent heat exchanging pipes are in contact with each other.

3. The heat exchanger according to claim 1, wherein the cross-sections of the upper portion and the lower portion of the heat exchanging pipe in the thickness direction have shapes matching with each other and the cross-sectional shapes of the flow path of the combustion gas which are formed by adjacent heat exchanging pipes are similar.

4. The heat exchanger according to claim 3, wherein the first parallel flow channel cap and the second parallel flow channel gap are formed by pressing and have a plurality of dome-shaped portions for closing the ends of the heat exchanging pipes and connecting portions between the dome-shaped portions, and insertion plates having a shape similar to the cross-sectional shape of the heat exchanging pipes are inserted between the heat exchanging pipes at the connecting portions such that the shape and the gap of the flow path of the combustion gas is similarly maintained.

5. The heat exchanger according to claim 1, wherein the heat exchanging pipes are formed by pressing and bent, and then the connecting portions are welded.

6. The heat exchanger according to claim 2, wherein the heat exchanging pipes are formed by pressing and bent, and then the connecting portions are welded.

7. The heat exchanger according to claim 3, wherein the heat exchanging pipes are formed by pressing and bent, and then the connecting portions are welded.

8. The heat exchanger according to claim 4, wherein the heat exchanging pipes are formed by pressing and bent, and then the connecting portions are welded.