KR20100134852A

KR20100134852A - Heat exchanger

Info

Publication number: KR20100134852A
Application number: KR1020090053193A
Authority: KR
Inventors: 김영모; 최영식
Original assignee: 주식회사 경동나비엔
Priority date: 2009-06-16
Filing date: 2009-06-16
Publication date: 2010-12-24
Also published as: WO2010147288A1

Abstract

The present invention relates to a heat exchanger that can be efficiently carried out the heat transfer of the heating water and the combustion gas passing through the heat exchange pipe. The heat exchanger has a flat tubular cross section with an open end, and a plurality of heat exchange pipes through which heating water passes; A first fixing plate and a second fixing plate having pipe insertion holes spaced at regular intervals in a longitudinal direction, and both end portions of each of the plurality of heat exchange pipes fitted into the pipe insertion holes; First and second parallel channel caps fixed to the first and second fixing plates, respectively, to form parallel channels by closing both ends of the heat exchange pipe; A heating water inlet connected to the first parallel channel cap; A heating water outlet connected to any one of the first and second parallel flow channel caps, and a plurality of protrusions or recesses are formed on a surface of the heat exchange pipe in a predetermined pattern, and the plurality of protrusions formed on adjacent heat exchange pipes. Or the recesses are in point contact with each other.

Description

Heat exchanger {HEAT EXCHANGER}

The present invention relates to a heat exchanger applied to the boiler, and more particularly to a heat exchanger that can be efficiently carried out the heat transfer of the heating water and the combustion gas passing through the heat exchange pipe.

As is well known, a combustion apparatus having a configuration capable of heating a heating water flowing along an inside of a heat exchange pipe in a combustion chamber by using a burner may include a boiler and a water heater. A boiler used in a general home or public building is used for heating and hot water, and a water heater heats cold water to a predetermined temperature within a short time so that a user can use hot water conveniently. Most combustors such as boilers and water heaters use oil or gas as fuel to combust through a burner, and then heat water using combustion heat generated during the combustion process, and use this heated water (hot water) to the user. Has a system to provide

Such a combustion apparatus is provided with a heat exchanger to absorb the heat of combustion generated from the burner, and various methods have been proposed for improving the heat transfer efficiency of the heat exchanger.

Conventionally, a method of widening the heat transfer area of a heat exchange pipe by installing a plurality of fins on an outer surface of the heat exchange pipe has been widely used. However, this type of heat exchange pipe has a complicated manufacturing method, which increases the manufacturing cost, while the effect of increasing the heat transfer area according to the installation of the fins is not so great.

1 is a view showing a rectangular heat exchanger having a simple manufacturing method than a conventional fin heat exchanger.

The heat exchanger inserts both ends of the heat exchange pipe 1 having a rectangular cross section with a larger width of the side than the height in the fixing plates 2 and 3, and the end plates 4 and 5 are, for example, blazed in the fixing plate. It has a structure which is closely bonded by welding. The heating water inlet 6 and the heating water outlet 7 are formed in the end plates 4 and 5, respectively. Each heat exchange pipe (1) is connected by a pipe connection (8), the heating water flowing into the heating water inlet (6) passes through a plurality of heat exchange pipes (1) and pipe connection (8) to the heating water outlet ( 7) outflow. Such a heat exchanger has an advantage that the manufacturing method is simpler than a fin type heat exchanger, and the heat transfer area can be sufficiently secured.

However, in such a heat exchanger, the combustion gas by combustion of the burner passes through the space between the heat exchange pipes 1 along the direction of the arrow, and the flow path through which the combustion gas passes is relatively short so that the heat of the combustion gas is transferred to the heat exchange pipe 1. There was a limit to delivery. In addition, the interval between the heat exchange pipes (1) is usually about 1 ~ 2mm in the case of a domestic boiler, when the boiler is running and the heating water passes into the heat exchange pipe (1), the heat exchange pipe (1) is expanded by the pressure of the heating water By blocking the flow path of the combustion gas passing therebetween, there was a problem that the heat exchange efficiency is lowered.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a heat exchanger capable of increasing the heat transfer efficiency by making the combustion gas form turbulent flow at the same time as the path of the combustion gas passing through the heat exchange pipe. have. In addition, the object is to provide a heat exchanger that can increase the heat transfer efficiency by passing the heating water inside the heat exchange pipe while forming a turbulent flow. In addition, an object of the present invention is to provide a heat exchanger capable of preventing the heat exchange pipe from expanding and blocking the flow path of the combustion gas due to the pressure of the heating water flowing into the heat exchange pipe. In addition, an object of the present invention is to provide a heat exchanger capable of maintaining a constant interval between heat exchange pipes through which combustion gas passes.

According to a first aspect of the present invention, there is provided a heat exchanger comprising: a plurality of heat exchange pipes each having a flat tubular cross section with an open end, and the heating water passing therein; A first fixing plate and a second fixing plate having pipe insertion holes spaced at regular intervals in a longitudinal direction, and both end portions of each of the plurality of heat exchange pipes fitted into the pipe insertion holes; First and second parallel channel caps fixed to the first and second fixing plates, respectively, to form parallel channels by closing both ends of the heat exchange pipe; A heating water inlet connected to the first parallel channel cap; A heating water outlet connected to any one of the first and second parallel flow channel caps, and a plurality of protrusions or recesses are formed on a surface of the heat exchange pipe in a predetermined pattern, and the plurality of protrusions formed on the adjacent heat exchange pipes. Or the recesses are in point contact with each other.

In addition, the plurality of protrusions or recesses is characterized in that arranged in the form of a comb.

In addition, a plurality of protrusions or recesses are formed in a predetermined pattern on the upper and lower surfaces of the heat exchange pipe.

In addition, the protrusion or recess formed on the upper surface of the heat exchange pipe is characterized in that the point contact with the protrusion or recess formed on the lower surface.

In addition, the plurality of protrusions or recesses formed in the heat exchange pipe is characterized in that arranged in the shape of a comb.

In addition, the point contact point of the plurality of protrusions or recesses formed in the heat exchange pipe is characterized in that the brazing welding.

In addition, the heat exchange pipe is characterized in that it comprises a protrusion extending in the width direction on both sides of the end.

In addition, the first parallel channel cap and the second parallel channel cap is formed by the press work, and comprises a plurality of dome-shaped portion for closing the end of the heat exchange pipe and the connection portion between the dome-shaped portion, the position of the connecting portion The insertion plate is formed between the heat exchange pipe and the insertion plate formed in a constant pattern of the protrusions or concave portions, it is characterized in that the separation distance of the flow path of each combustion gas is maintained approximately.

In addition, the heat exchange pipe is pressed and bent, the connection is characterized in that the weld.

According to a second aspect of the present invention, there is provided a heat exchanger comprising: a plurality of heat exchange pipes each having a flat tubular cross section with an open end, and the heating water passing therein; A first fixing plate and a second fixing plate having pipe insertion holes spaced at regular intervals in a longitudinal direction, and both end portions of each of the plurality of heat exchange pipes fitted into the pipe insertion holes; A first cap and a second cap fixed to the first fixing plate and the second fixing plate, respectively, and closing both ends of the plurality of heat exchange pipes; A heating water inlet connected to the first cap; A heating water outlet connected to any one of the first cap and the second cap, and a plurality of protrusions or recesses are formed on a surface of the heat exchange pipe in a predetermined pattern, and the plurality of protrusions formed on the adjacent heat exchange pipes or The recesses are in point contact with each other.

According to the heat exchanger of the present invention, it is possible to increase the heat transfer efficiency by forming a longer flow path of the combustion gas passing through the heat exchange pipe. The heat transfer efficiency can be increased by allowing the combustion water passing between the heating water passing through the heat exchange pipe and the heat exchange pipe to form turbulent flow. In addition, it is possible to prevent the heat exchange pipe from expanding and blocking the flow path of the combustion gas due to the pressure of the heating water flowing into the heat exchange pipe. In addition, the interval between each heat exchange pipe through which the combustion gas passes can be kept constant throughout.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements throughout. The same reference numerals in the drawings denote like elements throughout the drawings.

2 is a perspective view of a heat exchanger 100 of the present invention, Figure 3 is a view showing a schematic cross section of the heat exchanger.

The heat exchanger 100 is a heat exchange pipe 10, the first fixing plate 21 and the second fixing plate 22, the first parallel channel cap 31 and the second parallel channel cap 32, the heating water inlet 41 ) And a heating water outlet 42.

The heat exchange pipe 10 has a flat tubular cross section with an open end, and the heating water passes through the heat exchange pipe 10. The heat exchange pipe 10 is a plurality of laminated in the longitudinal direction of the heat exchanger (100).

The first fixing plate 21 and the second fixing plate 22 have pipe insertion holes 21a spaced at regular intervals in the longitudinal direction, and both end portions of each of the plurality of heat exchange pipes 10 are inserted into the pipe insertion holes. (See FIG. 7).

The first parallel channel cap 31 and the second parallel channel cap 32 are fixed to the first fixing plate 21 and the second fixing plate 22, respectively, and open both ends of the heat exchange pipe 10. Close to form parallel flow paths.

A lower portion of the first parallel flow channel cap 31 is connected to the heating water inlet 41, and an upper portion thereof is connected to the heating water outlet 42. Alternatively, the heating water inlet 41 may be connected to a lower portion of the first parallel flow channel cap 31, and the heating water outlet 42 may be connected to an upper portion of the second parallel channel cap 32. Positions of the heating water inlet 41 and the heating water outlet 42 can be freely selected by those skilled in the art according to the design needs.

Hereinafter, the flow path of the heating water passing through the heat exchanger 100 will be described with reference to FIG. 3.

The heating water enters the heating water inlet 41 under the heat exchanger 100 and flows to the left after passing through the two heat exchange pipes 10. The heating water passing through the left end of the heat exchange pipe 10 flows to the right through the left end of another two heat exchange pipes 10 stacked on the two heat exchange pipes 10. The left ends of the four heat exchange pipes 10 are closed by the dome-shaped portion 32a of the second parallel channel cap 32.

The heating water flowing to the right flows through the dome-shaped portion 31a of the first parallel channel cap 31 along the other two heat exchange pipes 10 to the left. In this way, the heating water is passed through the heating water outlet 42 connected to the upper portion of the first parallel flow channel cap 31 passing through the heat exchange pipe 10 while changing the flow path in a zigzag manner. While the heating water flows inside the heat exchange pipe 10, heat is exchanged with the combustion gas by combustion of the burner. In FIG. 3, the combustion gas transfers heat to the heating water while passing between the heat exchange pipes 10 along the direction coming out of the ground or entering the ground.

Figure 4 is a view showing the shape of the cross-section laminated a plurality of heat exchange pipe 10 of the present invention. 5 is a view showing the shape of the heat exchange pipe 10 of the present invention, (a) is a perspective view, (b) is a front view, (c) is a rear view. 6 is a view for explaining a state in which the protrusion 11 of the adjacent heat exchange pipe 10 is in point contact.

In the present invention, the width direction (w) of the heat exchange pipe (10) is a direction in which combustion gas passes between the heat exchange pipes, the thickness direction (t) is a direction indicating the thickness of the heat exchange pipe (10) having a flat tubular cross section, The longitudinal direction l refers to a direction representing the entire length of the heat exchange pipe 10 (see FIG. 5A).

On the surface of the heat exchange pipe (10) is a projection 11 inclined in the form of a comb pattern to extend the flow path of the combustion gas passing between the heat exchange pipes are spaced in the longitudinal direction (l) of the heat exchange pipe (10) Is installed. The portion between the adjacent protrusions 11 becomes a recess. Protrusions 11 of the same shape are formed on the rear side of the heat exchange pipe 10, and the inclined direction of the protrusions 11 is the same as the front side when viewed from the rear side, but when viewed from the front side and the front side. The opposite is true (see Fig. 5 (c)). Therefore, the inclined directions of the protrusions 11 between adjacent heat exchange pipes 10 are opposite to each other.

The heat exchange pipe (10) is preferably formed by pressing a metal plate, bending the center and the connecting portion by welding. This simplifies the manufacturing process and reduces the production cost of the heat exchange pipe 10.

The plurality of protrusions 11 or the concave portions formed in the heat exchange pipe 10 form a long flow path of the combustion gas passing between the heat exchange pipes 10, and the heating water passing through the inside of the heat exchange pipe 10 is the combustion gas. It increases the heat exchange efficiency by widening the area contacted with. In addition, the flow of the combustion gas passing between the adjacent heat exchange pipes 10 forms turbulent flow while passing between the protrusions 11 or the recesses, and the combustion gas flows between the adjacent heat exchange pipes 10 by such turbulence. The residence time is increased and the heat of the combustion gas is sufficiently transferred to the heating water. This leads to an increase in heat exchange efficiency.

As shown in FIG. 6, when a plurality of heat exchange pipes 10 are stacked, the protrusions 11 and 11 ′ of adjacent heat exchange pipes 10 are preferably in contact with each other. In the figure, the protrusions 11 of the heat exchange pipes 10 arranged in the front are shown in solid lines, and the protrusions 11 'of the heat exchange pipes 10 arranged in the back are shown in dotted lines. Since the protrusions 11 and 11 'are inclined in opposite directions to each other, a plurality of point contacts are formed. This point contact causes the combustion gas to pass between adjacent heat exchange pipes 10 along a flow path divided into a plurality of parts, thereby increasing the residence time of the combustion gas and allowing the heat of the combustion gas to be sufficiently transferred to the heating water, thereby transferring heat. To increase. In addition, the point contact effectively prevents the heat exchange pipe 10 from expanding and being blocked by the pressure of the heating water flowing into the heat exchange pipe 10 to block the flow path of the combustion gas passing therebetween.

Since the heat exchange pipe 10 is formed by pressing a metal plate, a protrusion or a recess having a complementary shape is also formed on the inner surface of the heat exchange pipe 10. In addition, the inclined direction of the protrusion formed on the upper surface of the heat exchange pipe 10 and the inclined direction of the protrusion formed on the lower surface are reversed. The flow of the heating water passing through the heat exchange pipe 10 by the protrusions or recesses forms a turbulent flow, and this turbulence increases the time that the heating water stays in the heat exchange pipe 10, and the heat of the combustion gas is increased. Ensure sufficient heat transfer to the water. This leads to an increase in heat exchange efficiency.

The protrusions formed on the inner surface of the heat exchange pipe 10 may also be in point contact with each other like the protrusions 11 and 11 ′ of the adjacent heat exchange pipe 10 shown in FIG. 6. This point contact causes the heating water to pass along the flow path divided into a plurality of heat exchange pipes 10, thereby increasing the residence time of the heating water to increase the heat transfer effect. Preferably, the part in point contact is welded by brazing welding. This reliably prevents the heat exchange pipe 10 from expanding due to the pressure of the heating water flowing into the heat exchange pipe 10.

7 is a view showing the shape of the first fixing plate 21 of the present invention. The shape of the second fixing plate 22 is also the same as the first fixing plate 21. 8 is a view showing a state in which the heat exchange pipe 10 of the present invention is fitted to the first fixing plate 21 and the second fixing plate 22.

The first fixing plate 21 is formed with spaced apart at regular intervals of the pipe insertion holes 21a into which the end of the heat exchange pipe 10 is fitted. The first parallel channel cap 31 is fixed on the first fixing plate 21 by, for example, brazing welding to form a parallel channel.

After the end portion of the heat exchange pipe 10 is fitted into the pipe insertion hole 21a, the contact surface is usually welded by brazing welding. Since the heat exchange pipe 10 is exposed to a high temperature environment, the joint surface welded by the deformation of the heat exchange pipe 10 of the metal material due to thermal expansion at a high temperature may be separated. If the joint surface is separated, the heating water leaks between them, which can cause serious problems.

In order to prevent the separation of the welding surface, it is preferable to include the projections 12 formed in the width direction (w) on both sides of the end of the heat exchange pipe (10) (see Fig. 5). The protrusion 12 provides rigidity to the end of the heat exchange pipe 10 to prevent the end of the heat exchange pipe 10 from being deformed into the pipe insertion hole 21a.

In addition, when the heat exchange pipe 10 is fitted into the pipe insertion hole of the first fixing plate 21 and the second fixing plate 22, the protrusion 12 is formed at the outside of the pipe insertion hole 21a as shown in FIG. It is preferred to be installed in contact. This helps the welded joint surface to maintain a well-bonded state by acting as the blocking portion when the heat exchange pipe 10 is to move in the horizontal direction.

9 is a view showing the shape of the first parallel flow path cap 31 of the present invention, Figure 10 is a view showing the insertion plate 50 inserted between the heat exchange pipe 10 of the present invention. The shape of the second parallel channel cap 32 is also substantially the same as the first parallel channel cap 31 except for the opening for connecting the heating water inlet 41 and the heating water outlet 42.

The first parallel channel cap 31 includes a plurality of dome portions 31a for closing an end of the heat exchange pipe 10 and a connection portion 32b between the dome portions. Generally, this type of parallel euro cap is produced by press working. As described above, the spacing between the heat exchange pipes 10 in the boiler is only 1 to 2 mm, but it is very difficult to form the dome-shaped section at intervals of 1 to 2 mm by press working (that is, the distance of the connection part 31b). It is very difficult to produce the first parallel euro cap 31 by press working so that 1 to 2 mm is obtained. Generally, the minimum distance which can form the connection part 32b by press work is about 4-5 mm. When the heat exchange path is formed by the parallel flow channel cap of this type, the spacing between the heat exchange pipes 10 adjacent to the connection portion of the parallel flow path cap should be 4 to 5 mm, and the spacing between the remaining heat exchange pipes 10 is Since it is 1 to 2mm, there is an unbalance of the gap between the heat exchange pipe (10). That is, the separation distance between the heat exchange pipes 10 positioned in the dome-shaped portion 31a is 1 to 2 mm, while the separation distance between heat exchange pipes 10 adjacent to the connection part is 4 to 5 mm. In this case, the combustion gas mainly passes between the heat exchange pipes 10 having a separation distance of 4 to 5 mm so that the combustion gas does not pass evenly between the heat exchange pipes 10, thereby deteriorating heat exchange efficiency.

In the present invention, to improve this point, the insertion plate 50 having a curved cross-sectional shape is inserted between the heat exchange pipes 10 at the position of the connection portion 31b of the first parallel euro cap (see FIG. 4). . The insertion plate 50 is similarly inserted into the connecting portion 32b of the second parallel channel cap 32 arranged alternately with the first parallel channel cap 31. As a result, the insertion plate 50 is inserted every two heat exchange pipes (see FIG. 3). Accordingly, the spacing between the heat exchange pipes 10 can be kept constant about 1 to 2 mm regardless of the connection portion 31b, and the combustion gas can pass evenly between the entire heat exchange pipes 10, thereby improving heat exchange efficiency. do.

11 is a schematic cross-sectional view of a heat exchanger of another embodiment of the present invention.

In the present embodiment, the open ends of the heat exchange pipes 10 are not closed by the parallel flow path caps 31 and 32, and the first caps having a shape in which all the open ends of the plurality of heat exchange pipes 10 communicate with each other ( 33) and the second cap 34 is closed.

The flow path of the combustion gas in the heat exchanger of this embodiment is the same as in the previous embodiment. However, the heating water does not flow along the zigzag flow path, the heating water entering the heating water inlet 41 in the upper portion flows to the right along the plurality of heat exchange pipes 10 while flowing downward, and then the heating in the lower portion. It is discharged along the water supply outlet 42. The heating water inlet 41 and the heating water outlet 42 may be arranged in various embodiments according to the design needs, of course.

The heat exchanger of the present embodiment also has the same shape of the heat exchange pipe 10, and thus has all the technical effects according to the shape of the heat exchange pipe 10 described in connection with the previous embodiment.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

1 shows a conventional rectangular heat exchanger.

2 is a perspective view of a heat exchanger of the present invention.

3 shows a schematic cross section of a heat exchanger of the invention;

Figure 4 is a view showing the shape of the cross-section laminated a plurality of heat exchange pipe of the present invention.

5 is a view showing the shape of the heat exchange pipe 10 of the present invention, (a) is a perspective view, (b) is a front view, (c) is a rear view.

6 is a view for explaining a state in which the protrusions of adjacent heat exchange pipes are in point contact.

7 is a view showing the shape of the first fixing plate of the present invention.

8 is a view showing a state in which the heat exchange pipe of the present invention is fitted to the first fixing plate and the second fixing plate.

9 is a view showing the shape of the first parallel euro cap of the present invention.

10 is a view showing the shape of the insertion plate inserted between the heat exchange pipe of the present invention.

11 shows a schematic cross section of a heat exchanger of another embodiment of the invention.

10: heat exchange pipe

11, 11 ': protrusion

12: protrusion

13: protrusions

21: first fixing plate

21a: pipe insertion hole

22: second fixing plate

31: first parallel euro cap

32: second parallel euro cap

31a, 32a: Dome Shape

31b, 32b: connection

33: first cap

34: second cap

41: heating water inlet

42: heating water outlet

50: insert plate

Claims

A plurality of heat exchange pipes each having a flat tubular cross section with an open end and passing heating water therein;

A first fixing plate and a second fixing plate having pipe insertion holes spaced at regular intervals in a longitudinal direction, and both end portions of each of the plurality of heat exchange pipes fitted into the pipe insertion holes;

First and second parallel channel caps fixed to the first and second fixing plates, respectively, to form parallel channels by closing both ends of the heat exchange pipe;

A heating water inlet connected to the first parallel channel cap;

A heating water outlet connected to any one of the first and second parallel euro caps,

The surface of the heat exchange pipe is formed with a plurality of protrusions or recesses in a predetermined pattern,

And the plurality of protrusions or recesses formed in adjacent heat exchange pipes are in point contact with each other.

The heat exchanger of claim 1, wherein the plurality of protrusions or recesses are arranged in the shape of a comb.

The heat exchanger of claim 1, wherein a plurality of protrusions or recesses are formed in a predetermined pattern on the upper and lower surfaces of the heat exchange pipe.

The heat exchanger of claim 3, wherein the protrusion or the recess formed on the upper surface of the heat exchange pipe is in point contact with the protrusion or the recess formed on the lower surface of the heat exchange pipe.

The heat exchanger of claim 4, wherein a plurality of protrusions or recesses formed in the heat exchange pipe are arranged in the shape of a comb.

The heat exchanger according to claim 5, wherein the point contact points of the plurality of protrusions or the recesses formed in the heat exchange pipe are brazed.

The heat exchanger of claim 1, wherein the heat exchange pipe has protrusions extending in the width direction on both sides of the end portion.

The dome-shaped part according to any one of claims 1 to 7, wherein the first parallel euro cap and the second parallel euro cap are formed by press working, and a plurality of dome-shaped portions for closing an end of the heat exchange pipe, Including a connection between the top,

An insertion plate having a protrusion or a recess formed in a predetermined pattern is inserted between the heat exchange pipes at a position of the connection part, so that the separation distance of the flow path of each combustion gas is maintained to be approximate.

8. The heat exchanger according to any one of claims 1 to 7, wherein the heat exchange pipe is pressed and bent, and then the connection part is welded.

A first cap and a second cap fixed to the first fixing plate and the second fixing plate, respectively, and closing both ends of the plurality of heat exchange pipes;

A heating water inlet connected to the first cap;

A heating water outlet connected to the second cap,

The heat exchanger of claim 10, wherein the plurality of protrusions or recesses are arranged in the shape of a comb.

The heat exchanger of claim 10, wherein a plurality of protrusions or recesses are formed in a predetermined pattern on the upper and lower surfaces of the heat exchange pipe.

The heat exchanger of claim 12, wherein the protrusion or the recess formed on the upper surface of the heat exchange pipe is in point contact with the protrusion or the recess formed on the lower surface of the heat exchange pipe.

The heat exchanger of claim 13, wherein a plurality of protrusions or recesses formed in the heat exchange pipe are arranged in a comb pattern.

15. The heat exchanger of claim 14, wherein point contact points of the plurality of protrusions or recesses formed in the heat exchange pipe are brazed.

The heat exchanger of claim 10, wherein the heat exchange pipe has protrusions extending in the width direction on both sides of the end portion.

The heat exchanger according to any one of claims 10 to 16, wherein the heat exchange pipes are pressed and bent, and then the connection parts are welded.