JP2010530054A - Heat exchanger - Google Patents

Abstract

  The present invention relates to a heat exchange device applied to a boiler, and it is possible to improve heat transfer efficiency by shortening the distance between the heat exchange pipes while ensuring a long path of heating water passing through the heat exchange pipe, and easily It aims at providing the heat exchange apparatus which can be manufactured. In order to realize the heat exchange device, according to the present invention, the heat exchange device includes a heat exchanger, first and second auxiliary plates, and first and second end plates. The heat exchanger includes a plurality of heat exchange pipe units that pass heating water and are spaced apart from each other at regular intervals. The heat exchange pipe unit is disposed between the heating water inlet and the heating water outlet, and is formed from a pipe having a rectangular cross section in which the width of the side in contact with the combustion gas is larger than the height. The first and second auxiliary plates are fixed to both ends of the heat exchange pipe unit, and maintain a constant distance between the plurality of heat exchange pipe units. The first and second end plates are fixed to the outer surfaces of the first and second auxiliary plates, respectively.

Description

  The present invention relates to a heat exchange device applied to a boiler, and more particularly to a heat exchange device that efficiently transfers heat between heating water passing through a heat exchange pipe and a discharge gas.

  Generally as a combustion apparatus which can heat the heating water which flows through the heat exchange pipe in a combustion chamber using a well-known burner, a boiler, a hot water supply apparatus, etc. are mentioned.

  Specifically, boilers used in homes and public facilities are used for heating and hot water supply. The hot water supply device is used to quickly heat cold water to a predetermined temperature so that a user can conveniently use hot water.

  Combustion devices such as boilers and hot water supply devices generally use oil or gas as fuel, burn the fuel with a burner, heat water using combustion heat generated in the combustion process, and heated water (hot water) Including a system that provides the user with the needs of the user.

  The combustion device includes a heat exchange device and absorbs combustion heat generated by the burner. Various methods for improving the heat transfer efficiency of the heat exchange device have been proposed in the prior art.

  FIG. 1 is a schematic front view showing the structure of a heat exchange device in the prior art, FIG. 2A is a detailed cross-sectional view along the line AA in FIG. 1, and FIG. 2B is a cross-sectional view along BB in FIG. It is sectional detail drawing which followed the line.

  Referring to FIGS. 1 and 2, the heat exchange device 1 includes a heating water inlet 10, a heat exchanger 20, and a heating water outlet 30. Heating water flows through the heating water inlet. The heat exchanger includes a plurality of heat exchange pipes 21, 22, 23, 24, and 25. The surface of the heat exchange pipe is in contact with the combustion gas, and heat transfer occurs while the heating water flowing in from the heating water inlet 10 passes through the heat exchange pipe. Heating water heated while passing through the heat exchange pipes 21, 22, 23, 24, and 25 is discharged through the heating water outlet.

  The heating water inlet 10 and the heat exchange pipes 21, 22, 23, 24, and 25 are connected to each other by a pipe connector 11. The water outlet 30 for heating and the heat exchange pipes 21, 22, 23, 24, and 25 are connected to each other by a pipe connector 31.

  Each of the heat exchange pipes 21, 22, 23, 24, and 25 has a substantially rectangular shape with a wide width and a low height in the longitudinal direction in which the combustion gas flows. The heat exchange pipes 21, 22, 23, 24 and 25 are arranged at a predetermined distance from each other so that the combustion gas passes between the heat exchange pipes 21, 22, 23, 24 and 25. Heat transfer occurs between them.

  The heat exchange pipes 21, 22, 23, 24, and 25 include upper plates 21a, 22a, 23a, 24a, and 25a, and lower plates 21b, 22b, 23b, 24b, and 25b, respectively. The upper plates 21a, 22a, 23a, 24a and 25a and the lower plates 21b, 22b, 23b, 24b and 25b are fixed to each other by welding at the edges.

  Each pipe connector 31 connecting the heat exchange pipes 21, 22, 23, 24, and 25 includes first and second connection members 31a and 31b, and these connection members bend in the lateral direction, It has the edge part mutually fixed by welding (in the inflow part of the heating water, the pipe connector 11 has the same structure).

  However, in the heat exchange device having the above structure, the distance between the heat exchange pipes becomes long due to the structural features of the heat exchange pipe including the upper and lower plates and the first and second connecting members. For this reason, there exists a problem that heat transfer efficiency falls. Further, since the manufacture of the heat exchange device is complicated and difficult, there is a problem that it is difficult to actually apply the heat exchange device to the boiler.

  The present invention has been made to solve the above problems, and it is possible to improve the heat transfer efficiency by shortening the distance between the heat exchange pipes while ensuring a long path for heating water passing through the heat exchange pipe. An object of the present invention is to provide a heat exchange device that can be easily manufactured.

  To achieve the above object, according to one aspect of the present invention, a heat exchange device includes a heat exchanger, first and second auxiliary plates, and first and second end plates. The heat exchanger includes a plurality of heat exchange pipe units that pass heating water and are spaced apart from each other at regular intervals. The heat exchange pipe unit is disposed between the heating water inlet and the heating water outlet, and is formed from a pipe having a rectangular cross section in which the width of the side in contact with the combustion gas is larger than the height. The first and second auxiliary plates are fixed to both ends of the heat exchange pipe unit, and maintain a constant distance between the plurality of heat exchange pipe units. The first and second end plates are fixed to the outer surfaces of the first and second auxiliary plates, respectively.

  In this case, the pipe insertion port may be formed so as to pass through the auxiliary plate in the longitudinal direction of the first and second auxiliary plates, and both ends of the plurality of heat exchange pipe units are fitted into the pipe insertion port. May be. Both ends of the heat exchange pipe unit, the first and second auxiliary plates, and the first and second end plates may be fixed by brazing welding, respectively.

  In addition, the plurality of heat exchange pipe units have opposite flow directions while heating water flowing from the heat exchange pipe unit provided at one end flows in the opposite direction to the heat exchange pipe unit provided at the other end. A series of flow paths that change to the above may be formed.

  In this case, the heating water inlet may be formed to pass through the first end plate, and the heating water outlet may be formed to pass through the second end plate.

  Further, the heating water inlet may be formed on the outer surface of the heat exchange pipe unit into which the heating water flows, and the heating water outlet may be formed on the outer surface of the heat exchange pipe unit from which the heating water flows out. Good

  The cross sections of the plurality of heat exchange pipes may be formed such that the distance between the heat exchange pipes at the combustion gas inflow portion is large and the distance between the heat exchange pipes at the combustion gas outflow portion is small.

  As described in detail above, in the heat exchange device according to the present invention, heat transfer efficiency is improved by shortening the distance between the heat exchange pipes while ensuring a long flow path passing through the heat exchange pipe, and easily It is possible to obtain the advantage of being manufactured.

FIG. 1 is a schematic front view showing the structure of a heat exchange device in the prior art.

2A is a detailed cross-sectional view taken along the line AA of FIG.

2B is a detailed cross-sectional view taken along line BB in FIG.

FIG. 3 is an assembled perspective view of a heat exchange device according to an embodiment of the present invention.

FIG. 4 is an exploded perspective view of the heat exchange device shown in FIG. 3.

FIG. 5 is a cross-sectional view showing a heating water path of the heat exchange device shown in FIG. 3.

FIG. 6 is an assembled perspective view of a heat exchange device according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a heating water path of the heat exchange device shown in FIG. 6.

FIG. 8 is a cross-sectional view of a heat exchange pipe according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view of a heat exchange pipe according to another embodiment of the present invention.

  Hereinafter, the structure and operation of preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  3 is an assembled perspective view of a heat exchange device according to an embodiment of the present invention, FIG. 4 is an exploded perspective view of the heat exchange device shown in FIG. 3, and FIG. 5 is a heat exchange shown in FIG. It is sectional drawing which shows the path | route of the water for a heating of an apparatus.

  The heat exchange device according to the present embodiment includes a first end plate 110, a first auxiliary plate 130, a heat exchanger 200, a second end plate 310, and a second auxiliary plate 330. The first end plate is disposed in the vicinity of an inflow portion through which heating water flows and has a heating water inlet 120. The first auxiliary plate is fixed to the inner surface of the first end plate 110. The heat exchanger includes a plurality of heat exchange pipe units 210, 220, and 230, and heat is heated between the heating water and the combustion gas while the heating water passes through the heating water inlet 120 and flows through the exchange pipe unit. An exchange occurs. The second end plate has a heating water outlet 320 through which heating water heated by the heat exchanger 200 is discharged. The second auxiliary plate is fixed between the inner surface of the second end plate 310 and the heat exchanger 200.

  The first end plate 110 includes a flat portion 110a that closes one end of the heat exchange pipe of the heat exchanger 200, and a bent portion 110b that is bent from the lower end of the flat portion 110a so as to pass heating water. The heating water inlet 120 is formed in the bent portion 110b.

  The plurality of pipe insertion openings 130a and 330a are formed to pass through the auxiliary plates at regular intervals in the longitudinal direction of the first and second auxiliary plates 130 and 330, respectively. Both ends of the pipes 220 and 230 are inserted into the pipe insertion openings.

  The combustion gas path 201 is formed between the heat exchange pipes of the heat exchanger 200 at regular intervals, and the combustion gas passes through the combustion gas path.

  In this embodiment, the cross section of the heat exchange pipe is formed in a rectangular shape so that the surface area of the heat exchange pipe in contact with the combustion gas is increased. However, the cross-sectional shape is not limited to this, and may be any rectangular shape as long as the heat exchange pipe has a rectangular cross-section whose width in contact with the combustion gas is larger than the height. For example, each corner of the rectangular heat exchange pipe may be rounded.

  The heat exchanger 200 includes a first heat exchange pipe unit 210. Heating water flowing from the heating water inlet 120 formed at one end of the heat exchanger passes through the heat exchange pipe unit.

  One end of the two heat exchange pipes 211 and 212 of the first heat exchange pipe unit 210 is inserted into the pipe insertion port 130a of the first auxiliary plate 130, and the other end is a pipe insertion port of the second auxiliary plate 330. 330a.

  The two heat exchange pipes 211 and 212 are spaced apart from each other at regular intervals, and combustion gas can pass between them.

  In this case, the heat exchange pipe 211 is formed by bending a large metal plate to have a rectangular cross section, caulking the edge 211f protruding from the side surface, and fixing the edge by brazing welding. .

  The edge insertion grooves 130b and 330b are formed in the pipe insertion ports 130a and 330a of the first and second auxiliary plates 130 and 330, and the edge 211f of the heat exchange pipe 211 is inserted into the edge insertion groove. .

  If the protruding edge 211f is removed by the separation process, it is not necessary to form the edge insertion grooves 130b and 330b.

  The two heat exchange pipes 211 and 212 are connected to each other at pipe connectors 211a and 212a formed at the other end of the heat exchange pipe, and the heating water in the lower heat exchange pipe 211 and the heat exchange pipe 212 in the upper side are exchanged. The heating water passes through the pipe connectors 212b and 221a and is sent to the second heat exchange pipe unit 220.

  The pipe connectors 211a and 212a protrude from the surface of the heat exchange pipe and are fixed to each other by welding. The shapes and fixing methods of pipe connectors 221a, 221b, 221c, 222a, 222b, 222c, 231a, 231b, and 232a, which will be described later, which connect the pipes of the second and third heat exchange pipe units 220 and 230 to each other, Same as above.

  According to this structure, since the distance between the two heat exchange pipes 211 and 212 can be shortened, heat transfer efficiency can be improved. The structures of second and third heat exchange pipe units 220 and 230, which will be described later, are the same as described above.

  One end of the two heat exchange pipes 221 and 222 of the second heat exchange pipe unit 220 is inserted into the pipe insertion port 130a of the first auxiliary plate 130, and the other end is a pipe insertion port of the second auxiliary plate 330. It is inserted into 330a so as to have a constant interval. The two heat exchange pipes 221 and 222 are connected to each other at pipe connectors 221b and 222a formed at one end of the heat exchange pipe. While the heating water sent out from the first heat exchange pipe unit 210 is supplied to the two heat exchange pipes 221 and 222 and sent to the left side, heat exchange occurs between the heating water and the combustion gas. Next, the heating water is sent to the third heat exchange pipe unit 230.

  One end of the two heat exchange pipes 231 and 232 of the third heat exchange pipe unit 230 is inserted into the pipe insertion port of the first auxiliary plate 130, and the other end is inserted into the pipe insertion port of the second auxiliary plate 330. Inserted at regular intervals. The two heat exchange pipes 231 and 232 are connected to each other at pipe connectors 231b and 232a formed at one end of the heat exchange pipe. While the water for heating sent out from the second heat exchange pipe unit 220 is supplied to the two heat exchange pipes 231 and 232 and sent to the right, heat exchange occurs between the water for heating and the combustion gas. Next, the heating water passes through the heating water outlet 320 and is sent to the location to be heated.

  The second end plate 310 includes a flat portion 310a that closes one end of the heat exchange pipes of the first and second heat exchange pipe units 210 and 220, and a bent portion that is bent from the upper portion of the flat portion 310a so that water for heating passes therethrough. 310b. The heating water outlet 320 is formed in the bent portion 310b.

  A method for fixing the heat exchange pipe to the first auxiliary plate 130 and the first end plate 110 and a method for fixing the heat exchange pipe to the second auxiliary plate 330 and the second end plate 310 will be described.

  Both ends of each heat exchange pipe are inserted into the pipe insertion port 130a of the first auxiliary plate 130, and then the first end plate 110 is brought into contact with the outer surface of the first auxiliary plate. Next, a place where the heat exchange pipe and the pipe insertion port 130a of the first auxiliary plate 130 are in contact with each other (portion a in the enlarged portion of FIG. 5), the first auxiliary plate 130 and the first end plate 110, At the place where the two come into contact with each other (part b in the enlarged portion in FIG. 5), the pipe and the plate are firmly fixed by brazing welding.

  The method for fixing the heat exchange pipe to the second auxiliary plate 330 and the second end plate 310 is the same as described above.

  According to the above structure, the heating water that is sent to the right through the first heat exchange pipe unit 210 is sent in the opposite direction in the second and third heat exchange pipe units 220 and 230. Therefore, since the length of the flow path through which the heating water flows is extended, the heat transfer efficiency can be improved.

  In the above embodiment, the structure in which heating water flows from the left to the right of the heat exchange pipe has been described.

  With reference to FIGS. 6 and 7, a structure in which heating water flows from the bottom to the top of the heat exchange pipe will be described.

  FIG. 6 is an assembly perspective view of a heat exchange device according to another embodiment of the present invention, and FIG. 7 is a cross-sectional view showing a heating water path of the heat exchange device shown in FIG.

  The heat exchange device according to the present embodiment includes a heat exchanger 500. The heat exchanger includes a plurality of heat exchange pipe units 510, 520, and 530, with heating water flowing through the heating water inlet 420 into the heat exchange pipe unit and then through the heating water outlet 620. Heat exchange occurs between the water for heating and the combustion gas.

  The heating water inlet 420 is formed in the lower heat exchange pipe 511 of the first heat exchange pipe unit 510, and the heating water outlet 620 is connected to the upper heat exchange pipe 532 of the third heat exchange pipe unit 530. It is formed.

  Similar to the embodiment shown in FIGS. 3 to 5, each of the pipes of the heat exchange pipe units 510, 520, and 530 has a rectangular cross section where the width of the side where the heat exchange pipe contacts the combustion gas is larger than the height. Any rectangular shape may be used.

  Furthermore, the pipe connectors for connecting the pipes of the heat exchange pipe units 510, 520, and 530 are the same as those in the embodiment shown in FIGS.

  The first auxiliary plate 430 and the first end plate 410 are sequentially fixed to one end of the heat exchange pipe units 510, 520, and 530, and the second auxiliary plate 630 and the second end plate 610 are heat exchange pipes. The other ends of the units 510, 520, and 530 are fixed sequentially.

  Similar to the embodiment shown in FIGS. 3 to 5, the pipe insertion openings 430 a and 630 a are formed so as to pass through the first and second auxiliary plates 430 and 630, respectively. The pipe insertion ports 430a and 630a are arranged at regular intervals in the longitudinal direction, and the distance between the heat exchange pipes is kept constant.

  The first and second end plates 410 and 610 are formed in a planar shape and close both ends of the heat exchange pipe units 510, 520, and 530.

  The heat exchanger 500 includes a first heat exchange pipe unit 510 through which heating water flowing through the heating water inlet 420 passes. The first heat exchange pipe unit 510 includes two heat exchange pipes 511 and 512. The heat exchange pipes are fitted into the first and second auxiliary plates 430 and 630 and are spaced apart from each other at regular intervals so that the combustion gas can pass between them.

  The heating water inlet 420 is connected to a pipe connector 511 a formed on the lower surface of the heat exchange pipe 511 below the first heat exchange pipe unit 510.

  The two heat exchange pipes 511 and 512 are connected to each other at pipe connectors 511b and 512a formed at one end of the heat exchange pipe. The heating water in the lower heat exchange pipe 511 and the heating water in the upper heat exchange pipe 512 are sent to the second heat exchange pipe unit 520.

  Each of the pipe connectors 511a, 511b, and 512a protrudes from the surface of the heat exchange pipe and is welded to the surface. The shape and fixing method of the pipe connector (not denoted by reference numerals) for connecting the pipes of the second and third heat exchange pipe units 520 and 530 to each other are the same as described above.

  The second heat exchange pipe unit 520 includes two heat exchange pipes 521 and 522, and the heating water in the second heat exchange pipe unit has a direction in which the heating water flows in the first heat exchange pipe unit 510. Flows in the opposite direction, ie to the left.

  The heating water that has passed through the second heat exchange pipe unit 520 flows to the third heat exchange pipe unit 530. The third heat exchange pipe unit 530 includes two heat exchange pipes 531 and 532. Heating water flows from left to right and is discharged through a heating water outlet 620 connected to a pipe connector formed on the upper surface of the upper heat exchange pipe 532.

  FIG. 8 is a cross-sectional view of a heat exchange pipe according to another embodiment of the present invention.

  The distance between the heat exchange pipes 711, 712, 713, 714, 715, and 716 through which the combustion gas passes is preferably such that the inflow portion side 700a is larger than the outflow portion side 700b. That is, as shown in FIG. 8, the cross section of each of the heat exchange pipes 711, 712, 713, 714, 715, and 716 is trapezoidal in the horizontal direction. Therefore, it can be seen that the distance between the heat exchange pipes 711, 712, 713, 714, 715, and 716 is shortened from the inflow portion side 700a toward the outflow portion side 700b.

  In general, the temperature of the combustion gas is high at the inflow portion of the heat exchange pipe and low at the outflow portion of the heat exchange pipe. Therefore, the volume of the combustion gas decreases as the combustion gas approaches the outflow part of the heat exchange pipe. When the volume of the combustion gas is reduced as described above and the cross-sectional area of the heat exchange pipe at the inflow portion is equal to the cross-sectional area of the heat exchange pipe at the outflow portion, the heat transfer efficiency is reduced by reducing the speed of the combustion gas. .

  Therefore, as in the structure of the heat exchange pipe of the present invention, when the combustion gas flows into the inflow portion side 700a having a large area and then flows out from the outflow portion side 700b, the inflow portion side 700a to the outflow portion side 700b. The speed of the combustion gas can be maintained. As a result, it is possible to improve heat transfer efficiency.

  FIG. 9 is a cross-sectional view of a heat exchange pipe according to another embodiment of the present invention.

  As shown in FIG. 9A, the heat exchange pipe 811 is formed into a flat plate having a substantially rectangular cross section, the edges 811a are brought into contact with each other and protruded laterally, and the edges are caulked and brazed. It may be formed by fixing with.

  Further, in FIG. 9B, the heat exchange pipe 911 is formed so that the cross section is substantially rectangular, and the edges 911a are brought into contact with each other, so that both ends of the flat plate are overlapped with the upper surface of the heat exchange pipe 911. It may be formed by fixing the edge by caulking and brazing welding.

  The invention has been described with reference to exemplary embodiments of the invention. However, it will be apparent to those skilled in the art that the embodiments are illustrative and that various modifications and changes can be made without departing from the scope and spirit of the invention.

Claims (6)

Including a plurality of heat exchange pipe units that pass heating water and are spaced apart from each other at regular intervals, the heat exchange pipe units being disposed between the heating water inlet and the heating water outlet; A heat exchanger formed from a pipe having a rectangular cross-section whose width in contact with the combustion gas is greater than the height;
First and second auxiliary plates that are fixed at both ends of the heat exchange pipe unit and maintain a constant distance between the plurality of heat exchange pipe units;
A heat exchange apparatus comprising: first and second end plates fixed to outer surfaces of the first and second auxiliary plates, respectively. A pipe insertion opening is formed to pass through the auxiliary plate in the longitudinal direction of the first and second auxiliary plates;
Both ends of the plurality of heat exchange pipe units are inserted into the pipe insertion port,
The heat exchange device according to claim 1, wherein both ends of the heat exchange pipe unit, the first and second auxiliary plates, and the first and second end plates are fixed by brazing welding.   In the plurality of heat exchange pipe units, while the heating water flowing from the heat exchange pipe unit provided at one end flows to the heat exchange pipe unit provided at the other end, the flow direction alternately changes in the opposite direction. The heat exchange device according to claim 1, wherein the heat exchange device forms a series of flow paths. The heating water inlet is formed to pass through the first end plate;
The heat exchange device according to claim 2 or 3, wherein the water outlet for heating is formed so as to pass through the second end plate. The heating water inlet is formed in the heat exchange pipe unit into which the heating water flows;
The heat exchange device according to claim 2 or 3, wherein the heating water outlet is formed in the heat exchange pipe unit from which the heating water flows out.   The cross sections of the plurality of heat exchange pipes are formed such that the distance between the heat exchange pipes at the inflow portion of the combustion gas is large and the distance between the heat exchange pipes at the outflow portion of the combustion gas is small. The heat exchange device according to any one of claims 1 to 3.

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