WO2009061085A2

WO2009061085A2 - Heat exchanger and heat exchanging pipe composing it

Info

Publication number: WO2009061085A2
Application number: PCT/KR2008/006224
Authority: WO
Inventors: Tae-Sik Min
Original assignee: Kyungdong Navien Co., Ltd.
Priority date: 2007-11-07
Filing date: 2008-10-21
Publication date: 2009-05-14
Also published as: WO2009061085A3; KR20090047050A; KR101109856B1

Abstract

The present invention relates to a heat exchanging pipe that constitutes a channel between a heating water inlet and a heating water outlet where heat is exchanged by coming in contact with combustion gas while heating water passes through the heat exchanging pipe and a structure a heat exchanger that facilitates manufacturing of an end plate into which both ends of the heat exchanging pipe are inserted and allows both ends of the heat exchanging pipe with the end plate in an accurate size. In order to achieve the above-mentioned structure, in a heat exchanging pipe of the present invention where heat is exchanged by coming in contact with combustion gas while heating water passes through the inside thereof and of which both lengthwise ends are inserted into end plates, both width wise ends of a thin metal sheet, which have a predetermined width project outside in a predetermined length and are bent, thereby forming flanges facing each other.

Description

HEAT EXCHANGER AND HEAT EXCHANGING PIPE

COMPOSING IT

Technical Field

[1] The present invention relates to a heat exchanger and a heat exchanging pipe composing it, which are used in a boiler, and more particularly, to a heat exchanger that facilitates manufacturing of a heat exchanging pipe which constitutes a channel between a heating water inlet and a heating water outlet where heat is exchanged by coming in contact with combustion gas while heating water passes through the heat exchanging pipe and is accurately coupled with an end plate into which both ends of the heat exchanging pipe are inserted, and a heat exchanging pipe composing it. Background Art

[2] In general, examples of combustors that can heat heating water flowing through the inside of a heat exchanging pipe in a combustion chamber by using a burner may include a boiler and a water heater.

[3] That is, the boiler that is used at a general home, a public building, or the like is used for heating or hot water and the water heater heats cold water up to a predetermined temperature within a short time to allow a user to conveniently use the hot water.

[4] Most of the combustors such as the boiler or the water heater is constituted by a system that uses oil or gas as fuel and combusts the oil or gas by means of a burner, heat water by using combustion heat generated in the course of the combustion, and supplies the heated water (hot water) by a user's request.

[5] The combustors include a heat exchanger for absorbing the combustion heat generated from the burner.

[6] FIG. 1 is a front schematic view illustrating a structure of a heat exchanger using a known U-shaped tube. FIG. 2 is a front schematic view illustrating a structure of a heat exchanger using a known cap.

[7] Heat exchangers 1 and 2 include a heating water inlet 10 through which heating water flows in, a heat exchanging unit 20 that is constituted by a plurality of heat exchanging pipes 21, 22, and 23 where heat is exchanged on surfaces thereof in contact with combustion gas while the heating water flowing in from the heating water inlet 10 passes through the insides of the heating exchanging pipes 21, 22, and 23, and a heating water outlet 30 through the heating water heated while passing through the heating exchanging pipes 21, 22, and 23.

[8] Both ends of each of the heat exchanging pipes 21, 22, and 23 are inserted into and weld-coupled with pipe insertion holes penetratively formed on end plates 11 and 31. A channel of the heating water flowing in the inside of each of the heat exchanging pipes 21, 22, and 23 is connected to the outsides of the end plate 11 and 31 through U- shaped rubes 12 and 14 shown in FIG. 1 or caps 32 and 34 shown in FIG. 2.

[9] As shown in FIG. 2, seals 35 are provided between inner surfaces of the caps 32 and

34 and outer surfaces of the end plates 11 and 31 to maintain airtightness by preventing the heating water from leaking out to an area other than the channel.

[10] The heat exchanging pipes 21, 22, and 23 are separated from each other by a predetermined gap and the high-temperature combustion gas passes therebetween, which results in exchanging the heat. A plurality of heat exchanging fins 25 are provided on the surfaces of the heating exchanging pipes 21, 22, and 23 in order to improve heat exchanging efficiency.

[11] The heat exchanging pipes 21, 22, and 23 that are used in the heat exchangers 1 and

2 may be fabricated by various materials and structures.

[12] As one example, in the case when the heat exchanging pipe is fabricated by brass as a material, the material cost is expensive and the heat exchanging pipe is corroded due to condensate water standing on the surface of the heat exchanging pipe in use. Therefore, the heating exchanging pipe is inappropriate for the use in a latent heat exchanger of a condensing boiler and a use environment thereof is limited.

[13] Meanwhile, a series of processes such as pipe making, heat treatment, drawing, cutting, etc. are progressed to fabricate the heat exchanging pipe. In the case when the heat exchanging pipe is fabricated by stainless as a material, it is difficult to accurately fabricate the shape of the heat exchanging pipe because of the property of the material.

[14] If the shape of the heat exchanging pipe is not fabricated in an accurate size, it is difficult to install the heat exchanging fins on the heat exchanging pipe or couple the heat exchanging pipe with the end plate.

[15] In addition, the heat exchanging pipe and the heat exchanging fins or the heat exchanging pipe and the end plate are coupled with each other by electrical welding or brazing- welding. At this time, when the size of the heat exchanging pipe is not accurate, the welding is not normally performed. Disclosure of Invention Technical Problem

[16] The present invention is contrived to solve the above-mentioned problems. It is an object of the present invention to provide a heat exchanger that includes heat exchanging pipes which is easy to fabricate and can be coupled with end plates in an accurate size by welding and a heat exchanging pipe composing it. Technical Solution

[17] In order to achieve the above-mentioned object, in a heat exchanging pipe of the present invention where heat is exchanged by coming in contact with combustion gas while heating water passes through the inside thereof and of which both lengthwise ends are inserted into end plates, both width wise ends of a thin metal sheet, which have a predetermined width project outside in a predetermined length and are bent, thereby forming flanges facing each other.

[18] The flanges are processed by machining, i.e., caulking or hamming.

[19] The flanges are electrically welded or brazing- welded.

[20] In addition, in a heat exchanger of the present invention, a plurality of heat exchanging pipes of any one are installed at predetermined intervals.

Advantageous Effects

[21] By a heat exchanger and a heat exchanging pipe composing it according to the present invention, in fabricating the heat exchanging pipe of the heat exchanger, a flange is formed to contact both ends of a thin metal sheet with each other and a predetermined part of the flange is joined by machining, i.e., caulking or hamming or securely joined to maintain airtightness by electrical welding or brazing- welding, such that it is easy to accurately fabricate the length of the sectional circumference of the heat exchanging pipe and it is possible to couple the heat exchanging pipe and an end plate with each other in an accurate size. Brief Description of Drawings

[22] FIG. 1 is a front schematic view illustrating a structure of a heat exchanger using a known U-shaped tube;

[23] FIG. 2 is a front schematic view illustrating a structure of a heat exchanger using a known cap; and

[24] FIG. 3 is an exemplification view of structures of a heat exchanging pipe and an end plate according to the present invention. Best Mode for Carrying out the Invention

[25] Hereinafter, the configuration and operation of a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[26] FIG. 3 is an exemplification view of structures of a heat exchanging pipe and an end plate according to the present invention.

[27] In the illustrated figure, heat exchanging pipes 51, 52, and 53 shown in FIGS. 3 (a),

3(c), and 3(e) are inserted into and coupled with pipe insertion holes 81, 82, and 83 that are penetratively formed on end plates 71, 72, and 73 shown in FIGS. 3(b), 3(d), and 3(f), respectively.

[28] In the illustrated figure, heat exchanging pipes 51, 52, and 53 shown in FIGS. 3 (a),

[29] The heat exchanging pipes 51, 52, and 53 have a round shape shown in FIG. 3(a) or an egg shape shown in FIG. 3(b) or a rectangular shape shown in FIG. 3(c) as a rectangle in which surfaces of the heat exchanging pipes 52 and 53 that come in contact with combustion gas have widths larger than heights.

[30] In fabricating the heat exchanging pipes 51, 52, and 53, a thin metal sheet having a predetermined width is bent and the flanges 61, 62, and 63 are formed so that both ends of the thin metal sheet project out in a predetermined length.

[31] Upper and lower members 61a, 61b, 62a, 62b, 63a, and 63b of the flanges 61, 62, and 63 horizontally face each other and are coupled with each other by machining, i.e., caulking or hamming.

[32] That is, gaps between the members are filled up to maintain airtightness by beating the flanges 61, 62, and 63 with a specially fabricated caulking chisel or hammer.

[33] The flanges 61, 62, and 63 may securely coupled with each other by electrically welding or brazing- welding connection portions of the upper and lower members 61a, 61b, 62a, 62b, 63a, and 63b of the flanges 61, 62, and 63.

[34] Thereafter, both ends of each of the heat exchanging pipes 51, 52, and 53 are inserted into the pipe insertion holes 81, 82, and 83 penetratively formed on the end plates 71, 72, and 73 and the heat exchanging pipes 51, 52, and 53 are securely coupled with the pipe insertion holes 81, 82, and 83 to maintain complete airtightness by electrically welding and brazing- welding the contact portions.

[35] Next, U-shaped tubes 12 and 14 shown in FIG. 1 or caps 32 and 34 shown in FIG. 2 are coupled with outer surfaces of the end plates 71, 72, and 73 in order to connect channels of the heat exchanging pipes 51, 52, and 53 to each other. In the coupling, as described above, the U-shaped tubes 12 and 14 and the caps 32 and 34 are coupled with the outer surfaces of the end plates 71, 72, and 73 by electrically welding or brazing-welding contact portions where the U-shaped tubes 12 and 14 or the caps 32 and 34 are in contact with the outer surfaces of the end plates 71, 72, and 73.

[36] The present invention is not limited to the embodiment, but it will be apparent to those skilled in the art that various modification and changes may be made without departing from the scopes and spirits of the present invention. Industrial Applicability

[37] As described above, the present invention can easily fabricate a heat exchanger of a boiler and a heat exchanging pipe composing it.

Claims

[1] A heat exchanging pipe where heat is exchanged by coming in contact with combustion gas while heating water passes through the inside thereof and of which both lengthwise ends are inserted into end plates, wherein both widthwise ends of a thin metal sheet, which have a predetermined width project outside in a predetermined length and are bent, thereby forming flanges facing each other.

[2] The heat exchanging pipe according to claim 1, wherein the flanges are processed by machining as caulking or hamming.

[3] The heat exchanging pipe according to claim 1, wherein the flanges are electrically welded or brazing- welded.

[4] A heat exchanger, wherein a plurality of heat exchanging pipes according to any one of claims 1 to 3 are installed at predetermined intervals.