KR100343475B1 - Heat exchanger - Google Patents

Abstract

(Problem) Provided is a heat exchanger capable of preventing condensation in a water pipe, preventing a decrease in heat exchange efficiency and preventing a decrease in durability of a combustion auxiliary body.

(Solution means) The fin substrate 8 of the heat exchange fin 1 is formed in substantially rectangular shape along the inner wall of the combustion auxiliary body 3 in both the left and right sides thereof. The heat exchange fin 1 has a first bent piece 9 spaced apart from the inner wall of the combustion substructure 3 along approximately the upper half of the left and right sides thereof, and an inner wall of the combustion substructure 3 along the substantially lower half of the left and right sides thereof. The second bending pieces 10 to be soldered to each other are formed to be bent perpendicularly to the pin substrate 8, respectively. The fin substrate 8 is cut out from the lower side toward the upper water pipe 2a penetrating the upper portion of the fin substrate 8 to form a cutout portion 14.

Description

Heat exchanger {HEAT EXCHANGER}

The present invention relates to a heat exchanger such as a hot water supply device.

In the conventional hot water supply apparatus, for example, a heat exchange fin disclosed in Japanese Patent Application Laid-open No. Hei 10-325610 is used. 3 is a cross-sectional view of a heat exchanger in which the heat exchange fins are used. In the heat exchanger shown in FIG. 3, the plurality of heat exchange fins a are arranged so as to overlap each other, and are arranged inside the combustion auxiliary body b. The upper and lower water pipes c, c, ... and the lower water pipes d, d, ... are respectively provided in the heat exchange fin a at the upper and lower portions thereof. The burner e is provided below the heat exchange fin a.

The heat exchange fins (a) have a fin substrate (f) having a substantially trapezoidal shape in which the lower half forms an approximately rectangular shape along the inner wall of the combustion auxiliary body (b), and the upper half is narrowed toward the upper side. . In the fin substrate f, bent pieces g and h bent perpendicularly to the fin substrate f are formed along the left and right sides thereof, respectively. The fin substrate f is formed with cutouts i, i, ... cut out in the vertical direction toward the upper water pipe c while avoiding the lower water pipe d on the lower side thereof. The heat exchange fin (a) is a combustion piece (b) whose bending piece (h) is formed by a brazing material (R) placed in a substantially triangular gap formed between the bending piece (g) and the inner wall of the combustion fitting body (b). ) Is soldered to the inner wall.

In the heat exchanger configured as described above, the heat of the combustion exhaust burned in the burner (e) is directly or indirectly through the heat exchange fin (a) and the upper water pipes (c, c, ...) and the lower water pipes (d, d, ...), the water flowing in these water pipes is heated up. By the way, since the upper water pipe c is installed at a position farther from the burner e than the lower water pipe d, the upper water pipe c loses heat to the heat exchange fins a and the combustion exhaust whose temperature is lowered contacts. Condensation is likely to occur. In order to prevent such condensation, combustion exhaust that rises near the inner wall of the combustion auxiliary body b is led to the upper water pipe c side by the bending piece g. The combustion exhaust rising near the inner wall of the combustion auxiliary body b has a high mixing ratio with fresh air rising from the outer circumferential side of the burner e, and thus its dew point temperature is low. Condensation in the water pipe (c) is suppressed. Moreover, since the amount of heat lost by the heat exchange fins a while the combustion exhaust reaches the upper water pipe c is suppressed by forming the cutout portion i, the upper water pipe c is brought into contact with the high temperature combustion exhaust. Condensation is suppressed.

However, the larger the notch (i) is formed, the lower the heat loss of the combustion exhaust is, so that condensation in the upper water pipe (c) can be reliably prevented, while the area of the heat exchange fin (a) is reduced. The heat exchange efficiency falls. Therefore, it is difficult to raise the temperature of the water flowing in the upper water pipe c efficiently. Here, in order to make up for the area of the heat exchange fin (a) lost by forming the cutout (i), a substantially triangular gap formed between the bent piece (g) and the inner wall of the combustion auxiliary body (b) is formed. It is conceivable to expand the fin substrate f by filling it up.

In this case, the left and right sides of the heat exchanging fin form a substantially rectangular shape along the inner wall of the combustion subsidiary body b over the entire length, and the left and right sides of the heat exchanging fin fit the inner wall of the combustion subsidiary body b over the entire length. When touched, the following problems arise. A duct for discharging the combustion exhaust of the burner e is installed at the upper portion of the combustion subsidiary body b. Here, for example, it is conceivable to use a duct in which the inlet of the exhaust path is biased to the left or right side of the heat exchange fin (a), as disclosed in JP-A-6-22743. In this case, the combustion exhaust rises to the left or right in the combustion auxiliary body b. Therefore, the heat of the combustion exhaust is concentrated on the left or right side of the upper part of the heat exchange fin a, and there is a fear that the durability of the combustion subsidiary body b becomes excessively high at the portion where the heat is transferred, thereby deteriorating durability. have.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat exchanger capable of preventing condensation in a water pipe, preventing a decrease in heat exchange efficiency, and preventing a decrease in durability of a combustion auxiliary body.

1 is a cross-sectional view showing a heat exchanger of the present embodiment.

Fig. 2 is a perspective view showing the main parts of the heat exchange fins 1 used in the heat exchanger of the present embodiment.

3 is a cross-sectional view showing a conventional heat exchanger

Explanation of symbols for main parts in the drawings

1-heat exchange fin 2a-upper water pipe

2b-lower water pipe 3-combustion gas

8-pin substrate 9-1st bending piece

10-Second Bent Part 14-Notch

15-cutouts for soldering material 16-ramps

The heat exchanger of the present invention for solving the above problems is a heat exchanger having a heat exchanger fin which is arranged so that the water pipe is penetrated and arranged in a combustion subsidiary body. An approximately rectangular fin substrate over the inner wall of the combustion auxiliary body; A first bent piece that is bent vertically with respect to the fin substrate along approximately upper half portions of left and right sides of the fin substrate, and is spaced apart from an inner wall of the combustion auxiliary body; A second bent piece that is bent vertically with respect to the fin substrate along substantially lower half portions of left and right sides of the fin substrate, and is soldered to an inner wall of the combustion auxiliary body; and includes an upper portion of the fin substrate in the water pipe. And a cutout portion formed by cutting the pin substrate from the lower side toward the upper water pipe to penetrate. &Quot;

In the heat exchanger, the heat exchange fin is attached to the second bent piece by soldering it to the combustion auxiliary body in a state in which the first bent piece is separated from the inner wall of the combustion auxiliary body. Therefore, it is possible to prevent heat transfer from the upper part of the heat exchange fin to the inner wall of the combustion auxiliary body. In addition, it is possible to prevent contact between the combustion exhaust rising to the upper portion of the heat exchange fin and the inner wall of the combustion auxiliary body by the first bent piece. Therefore, when the combustion exhaust is concentrated to the left or right at the top of the heat exchange fins, it is possible to prevent the heat of the concentrated combustion exhaust from being transferred to the combustion auxiliary body. As a result, it is possible to prevent the combustion auxiliary body from becoming partly excessively high and deteriorating its durability.

In addition, since the heat loss until the heat of the combustion exhaust reaches the upper water pipe by forming the cutout is suppressed, condensation in the upper water pipe can be prevented by sufficiently contacting the upper water pipe with the high temperature combustion exhaust.

In addition, the fin substrate is formed in a rectangular shape along the inner wall of the combustion auxiliary body over both lengths of its left and right sides. Therefore, the area of the heat exchange fins lost as much as the portion where the cutouts are formed is supplemented to both sides of the upper portion of the fin substrate, thereby preventing a decrease in heat exchange efficiency and further raising the temperature of the water flowing in the water pipe efficiently. have.

In order to solder and attach the heat exchange fin to the inner wall of the combustion auxiliary body, it is conceivable to install a brazing material at the lowermost side between the first bending piece and the combustion auxiliary body. In this case, it is necessary to secure a space between the first bent piece and the inner wall of the combustion auxiliary body to install a solder material having a size corresponding to the amount required for soldering. However, in order to prevent heat transfer from the upper part of the heat exchange fin to the combustion auxiliary body and to replenish the area of the heat exchange fin, it is preferable that the upper and lower half portions of the left and right sides of the heat exchange fin be approached as far as possible while being separated from the combustion auxiliary body.

Here, in the heat exchanger of the said structure, "the heat exchanger of the said structure WHEREIN: The said heat exchange fin is provided with the notch for the brazing material which cut | disconnected the said 2nd bending piece and the said fin substrate continuously, The said heat exchange fin is the said notch for the brazing material Attached to the inner wall of the combustion auxiliary body by soldering the second bent piece by a brazing material attached to the inner side of the combustion auxiliary body.

In the heat exchanger comprised in this way, a brazing material can be provided in the notch for a brazing material, and a heat exchange fin can be attached by soldering the 2nd bending piece to the inner wall of a combustion auxiliary body by this brazing material. Therefore, it is not necessary to secure a space between the first bent piece and the inner wall of the combustion auxiliary body in order to install the brazing material. Therefore, it is possible to extend the upper half of the heat exchange fin so that the upper half of the left and right sides of the heat exchange fin are approached as far as possible while being spaced apart from the combustion auxiliary body.

The heat exchanger of the present invention is characterized in that, in the heat exchanger having the above configuration, the cutout portion for the brazing material has an inclined portion which is inclined downward from the inside of the fin substrate toward the second bent piece.

In this case, it is possible to reliably flow the brazing material provided in the cutout portion for the brazing material between the second bent piece and the inner wall of the combustion auxiliary body along the inclined portion.

Embodiment of the Invention

The heat exchanger of the present invention will be described in detail with reference to the accompanying drawings. 1 is a cross-sectional view showing a heat exchanger of the present embodiment, and FIG. 2 is a perspective view showing the main portion of the heat exchanger fin used in the heat exchanger of the present embodiment.

In the heat exchanger of this embodiment shown in FIG. 1 and FIG. 2, the heat exchange fin 1 is provided so that upper and lower water pipes 2a, 2a, ... and lower water pipes 2b, 2b, ... may pass through the heat exchange fin 1, respectively. It is. The heat exchange fins 1 are arranged in such a manner that the plurality of heat exchange fins overlap each other and are arranged inside the combustion auxiliary body 3 having a substantially rectangular cylindrical shape. The burner 4 is provided below the combustion auxiliary body 3. A flange 5 is formed on the upper outer wall of the combustion auxiliary body 3, and a duct 6 for discharging the combustion exhaust of the burner 4 is attached to the flange 5 with its attachment portion caulked. The inlet of the exhaust path 7 of the duct 6 is formed to be biased to the right as shown in FIG. 1, and the combustion exhaust of the burner 4 is biased to the right of the combustion auxiliary body 3 as indicated by the arrow. .

The heat exchange fin 1 is provided with the fin substrate 8 formed in substantially rectangular shape along the inner wall of the combustion auxiliary body 3 in the both right and left sides. The heat exchange fin 1 is formed with a first bent piece 9 and a second bent piece 10 which are bent perpendicularly to the fin substrate 8 along the upper and lower halves of the left and right sides of the fin substrate 8, respectively. The first bent piece 9 is separated from the inner wall of the combustion auxiliary body 3, and the second bent piece 10 is soldered to the inner wall of the combustion auxiliary body 3. The heat exchange fin 1 is also provided with a third bent piece 11 continuous to the first bent piece 9, which is bent vertically with respect to the fin substrate 8 along the left and right ends of the upper side of the fin substrate 8. have. The upper part of the heat exchange fin 1 is provided with the plurality of blades 12 which are substantially U-shaped so that the fin board | substrate 8 may be partially cut out and extended to the left-right direction. At the position where the blades 12, 12,... Of the fin substrate 8 are cut out, communication holes 13, 13,..., Which communicate the front and rear surfaces of the fin substrate 8 are formed, and the lower side of the heat exchange fin 1 is formed. The cutouts 14, 14, ... which cut | disconnected the pin board | substrate 8 in the vertical direction from the lower side side are formed in the upper water pipe 2a, avoiding the lower water pipe 2b. Moreover, the notch 15 for the brazing material which cut | disconnected the upper part of the 2nd bending piece 10 and the fin board | substrate 8 continuously is formed, and this notch for brazing material 15 is formed in the inside of the fin board | substrate 8. It has the inclined part 16 inclined downward toward the 2nd bending piece 10. As shown in FIG. In forming the notched portion 15 for the brazing material, the second bent piece 10 is partially cut out in the width direction thereof to secure the strength of the second bent piece 10.

In the heat exchanger configured as described above, when the heat exchange fins 1 are soldered and attached to the combustion auxiliary body 3, first, the heat exchange fins 1 are arranged so that a plurality of heat exchange fins 1 overlap each other, and a rod shape not shown along the alignment direction is provided. The upper brazing material is installed in the cutout portion 15 for the brazing material. Then, after arranging the plurality of heat exchange fins 1 in the above-described state at the predetermined position of the combustion auxiliary body 3, the brazing material melted by heating is transferred to the second bent piece 10 and the combustion auxiliary body 3. Flow into the gap with the inner wall. At this time, the molten solder material is reliably flowed into the gap by the inclined portion 16 inclined downward from the inside of the fin substrate 8 toward the second bent piece 10. Therefore, the heat exchange fin 1 is attached by soldering the second bent piece 10 to the inner wall of the combustion auxiliary body 3 while the first bent piece 9 is separated from the inner wall of the combustion auxiliary body 3. .

In the use of the heat exchanger, the heat of the combustion exhaust burned in the burner 4 is transferred to the upper water pipe 2a and the lower water pipe 2b directly or indirectly through the heat exchange fin 1 so that the upper water pipe 2a And the water flowing in the lower water pipe 2b are heated up. As described above, the combustion exhaust of the burner 4 ascends to the right of the combustion auxiliary body 3 to the right as indicated by the arrow in FIG. 1, and then is discharged to the outside through the exhaust path 7 of the duct 6. Therefore, in the heat exchanger shown in FIG. 1, the upper right side of the heat exchange fin 1 in which combustion exhaust is concentrated becomes higher than other portions.

However, as described above, in the heat exchange fin 1, the second bent piece 10 is soldered to the combustion auxiliary body 3 while the first bent piece 9 is separated from the inner wall of the combustion auxiliary body 3. Attached. Therefore, it is possible to prevent heat transfer from the upper portion of the heat exchange fins 1 to the combustion auxiliary body 3. Further, the first bent piece 9 and the third bent piece 11 can prevent contact between the combustion exhaust that rises above the heat exchange fin 1 and the inner wall of the combustion auxiliary body 3. Therefore, it is possible to prevent the heat of the combustion exhaust concentrated to the upper right side of the heat exchange fin 1 from being transferred to the combustion auxiliary body 3. As a result, it is possible to prevent the combustion auxiliary body 3 from becoming excessively high in part and deteriorating its durability.

In addition, since the heat loss until the heat of the combustion exhaust reaches the upper water pipe 2a is suppressed by forming the cutout portion 14, the upper water pipe 2a by sufficiently contacting the high temperature combustion exhaust with the upper water pipe 2a. Can prevent dew condensation. In addition, the combustion exhaust which rises near the inner wall of the combustion auxiliary body 3 has a relatively low dew point temperature because the mixing ratio with the fresh air rising on the outer circumferential side of the burner 4 is large. Condensation in the upper water pipe 2a is prevented because the combustion exhaust in the vicinity of the inner wall of the combustion auxiliary body 3 comes into contact with the upper water pipe 2a on the turbulence generated by the impact on the blade 12.

In addition, the fin substrate 8 is formed in the rectangular shape along the inner wall of the combustion auxiliary body 3 in the both left and right sides over the full length. In addition, a brazing material (not shown) can be provided in the cutout portion 15 for the brazing material formed on the heat exchange fin 1, and the heat exchange fin 1 is formed on the inner wall of the combustion auxiliary body 3 by the brazing material. It can attach by soldering the bending piece 10. Therefore, it is not necessary to secure a space between the first bent piece 9 and the inner wall of the combustion auxiliary body 3 in order to install the brazing material. As a result, the upper half of the heat exchange fin 1 can be expanded so as to be as close as possible while separating the upper half of the left and right sides of the heat exchange fin 1 from the combustion auxiliary body 3. As a result, the area of the heat exchanger fin 1 lost by the portion where the cutout portion 14 is formed is replenished in the upper both sides of the fin substrate 8, thereby preventing a decrease in the heat exchanger efficiency of the heat exchanger fin 1. In addition, the combustion exhaust rises while hitting the blade 12 and flows from one side of the fin substrate 8 along the other side through the communication hole 13 so that the heat exchange fin 1 more efficiently heats the combustion exhaust. Good absorption. Therefore, in the heat exchanger of this embodiment, the water flowing in the upper water pipe 2a and the lower water pipe 2b can be heated up efficiently.

In addition, as described above, the duct 6 is caulked and attached to the flange 5 formed on the upper outer wall of the combustion auxiliary body 3, by which the upper part of the combustion auxiliary body 3 is deflected inward. There is a case. In this case, this bending deformation is absorbed by a gap formed between the first bent piece 9 and the inner wall of the combustion auxiliary body 3, whereby the deformation stress of the combustion auxiliary body 3 is reduced by the heat exchange fin 1. The situation that is added to can be avoided.

As described above, according to the heat exchanger of the present invention, since only the second bent piece is soldered and attached to the combustion auxiliary body while the first bending piece is separated from the inner wall of the combustion auxiliary body, Heat transfer to the inner wall of the combustion auxiliary body can be prevented. In addition, it is possible to prevent contact between the combustion exhaust rising to the upper portion of the heat exchange fin and the inner wall of the combustion auxiliary body by the first bent piece. Therefore, when the combustion exhaust is concentrated to the left or right at the top of the heat exchange fins, it is possible to prevent the heat of the concentrated combustion exhaust from being transferred to the combustion auxiliary body. As a result, it is possible to prevent the combustion auxiliary body from becoming partly excessively high and deteriorating its durability.

In addition, since the heat loss until the heat of the combustion exhaust reaches the upper water pipe by forming the cutout is suppressed, condensation in the upper water pipe can be prevented by sufficiently contacting the upper water pipe with the high temperature combustion exhaust.

In addition, since the left and right sides of the fin substrate are formed in a rectangular shape along the inner wall of the combustion auxiliary body over the entire length, the area of the heat exchange fin lost by the portion where the cutout is formed is supplemented to the upper both sides of the fin substrate. As a result, a decrease in the heat exchange efficiency can be prevented, and further, the water flowing in the water pipe can be efficiently heated.

Claims (3)

In the heat exchanger having a heat pipe is installed so as to penetrate the plurality of heat exchanger fins arranged in the combustion auxiliary body, The heat exchanging fins may include: a substantially rectangular fin substrate along an inner wall of the combustion auxiliary body in both left and right sides thereof; A first bent piece that is bent vertically with respect to the fin substrate along approximately upper half portions of left and right sides of the fin substrate, and is spaced apart from an inner wall of the combustion auxiliary body; A second bent piece that is bent vertically with respect to the fin substrate along substantially lower half portions of left and right sides of the fin substrate, and is soldered to an inner wall of the combustion auxiliary body; and includes an upper portion of the fin substrate in the water pipe. And a cutout portion formed by cutting the fin substrate from the lower side toward the upper water pipe passing therethrough. The method according to claim 1, The heat exchange fin is provided with a cutout portion for a brazing material obtained by continuously cutting the second bent piece and the pin substrate, and the heat exchange fin is formed on the inner wall of the combustion auxiliary body by a brazing material provided in the cutout portion for the brazing material. A heat exchanger characterized in that the bending piece is attached by soldering. The method according to claim 2, And the cutout portion for the brazing material has an inclined portion that is inclined downward from the inside of the fin substrate toward the second bent piece.