JP3196410B2 - Heat exchange fins - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat exchange fin.

[0002]

2. Description of the Related Art FIG. 4 is a view showing an example of a conventional heat exchange fin. Explaining the prior art with reference to this figure, in a so-called one-can, two-circuit heat exchanger, a plurality of fin sheets 10 are arranged at regular intervals, and two types of water exchange pipes 1, 2 are provided on the fin sheets 10. It is brazed in a penetrated form. That is,
The fin sheet 10 is formed by penetrating a large number of Dharma-type insertion holes 20 in which the lower part of the upper insertion hole 21 and the upper part of the lower insertion hole 22 are continuous so that the two water pipes 1 and 2 can be inserted vertically. Is done. And in the insertion hole 21 above this Dharma type insertion hole 20,
For example, the water pipe 1 of the bath water heating circuit is inserted, and the water pipe 2 of the hot water supply circuit is inserted into the lower insertion hole 22. 2 above
The brazing between the water passage pipes 1 and 2 and the fin sheet 10 is performed by a pair of brazing material insertion holes 31 and 31 and a Dharma type insertion hole 20 at the top of the periphery of the insertion hole 21 above the Dharma type insertion hole 20. The brazing material insertion holes 32 and 33 are respectively provided on both side shoulders of the cracked portion, and the brazing material 3 is inserted into these holes 31, 32 and 33 so that the water pipes 1 and 2 are horizontal and the fin sheet is Heating and brazing were performed so that 10 was in a vertical state.

[0003]

However, a brazing material insertion hole 31 is provided at the top of the peripheral edge of the insertion hole 21 above the Dharma-type insertion hole 20 and on both shoulders of the cracked portion of the Dharma-type insertion hole 20. ,
In the conventional heat exchange fins in which 32 and 33 are arranged, at the time of brazing, the melted wax flows down along the outer periphery of the Dharma-type insertion hole 20 and the solder to the cracked portion of the Dharma-type insertion hole 20. Supply is easily interrupted, and there is a problem that brazing between the water pipes 1 and 2 and the fin sheet 10 and the water pipes 1 and 2 at this portion becomes insufficient.

Therefore, the present invention solves the above-mentioned disadvantages of the prior art, and brazes the water pipes 1 and 2 and the fin sheet 10 at the cracked portion of the Dharma-type insertion hole 20, and removes the water pipes 1 and 2.
An object of the present invention is to provide a heat exchange fin in which the two can be sufficiently brazed to each other, so that cracks due to thermal stress or the like are less likely to occur.

[0005]

In order to achieve the above object, a heat exchange fin according to the present invention is characterized in that upper and lower insertion holes are mutually connected.
When the Dharma-shaped insertion hole communicating with the
In both cases, except the constricted part near the center of the Dharma-type insertion hole
The peripheral portions of the upper and lower insertion holes are burring edges, and
The burring edge on the same diagonal upper side of each lower insertion hole
The brazing material insertion holes are provided in contact with the outside of the
Insert the water exchange pipe for heat exchange into the upper and lower insertion holes, and
Insert the brazing material into the brazing material insertion hole, set
The brazing material insertion holes around the upper and lower insertion holes
It is characterized by being brazed so as to occupy the highest position .

[0006]

According to the above-mentioned feature of the present invention, the brazing material insertion hole is disposed at an obliquely upper position among the peripheral portions of the upper and lower insertion holes of the Dharma-type insertion hole, so that the brazing material insertion hole is provided. When the brazing material is heated by brazing, the entire fin sheet is inclined so that these brazing material insertion holes occupy the highest position around the upper and lower water pipe insertion holes. By melting the brazing material, the brazing material is sufficiently supplied also to the cracked portion of the Dharma-type insertion hole, and the brazing of the water pipes to the fin sheet and the brazing of the water pipes in this part are sufficiently ensured. Done.

[0007]

FIG. 1 is a view showing an embodiment of a heat exchange fin according to the present invention, FIG. 2 is a detailed view of a Dharma type insertion hole, and FIG. 3 is a view showing a state of the heat exchange fin at the time of brazing. FIG.

[0008] A plurality of Dharma-shaped insertion holes in the fin sheet 10
20 is penetrated, each Dharma type insertion hole 20 is the upper insertion hole
By connecting the lower part of 21 and the upper part of the lower insertion hole 22 in a continuous manner, the vicinity of the center is broken. The periphery of the upper and lower insertion holes 21 and 22 excluding the cracked portion near the center is a burring edge 23. In the present embodiment, the brazing material insertion holes 41 and 42 are disposed at the upper right corners of the peripheral portions of the upper and lower insertion holes 21 and 22. In this example, they are arranged at an angle of 30 degrees from the horizontal position. The brazing material insertion holes 41 and 42 are provided in contact with the outside of the burring edge 23 so as not to interrupt the burring edge 23. It should be noted that a small brazing material insertion hole 43 is also provided in the cracked portion near the center of the Dharma-type insertion hole 20.

A plurality of the fin sheets 10 constructed as described above are arranged at a predetermined interval, and the two water pipes 1 and 2 are passed through the insertion holes 21 and 22 of the Dharma-type insertion hole 20, respectively. 3 is passed through the brazing material insertion holes 41, 42, and 43, and these are arranged to be inclined in one direction as shown in FIG. Hole 21,
Take the highest position around 22. By heating in this state, the melted wax, particularly the wax melted in the brazing material insertion hole 42 of the lower insertion hole 22, has a sufficient amount in the cracked portion of the Dharma-type insertion hole 20 located nearby due to gravity. Flows naturally, and the water pipes 1 and 2 and the fin sheet 10
And the brazing between the water pipes 1 and 2 are surely performed. By arranging the brazing material 3 also in the brazing material insertion hole 43 provided near the cracked portion of the Dharma-type insertion hole 20, the brazing of the cracked portion is further ensured. In addition, since the brazing material insertion holes 41 and 42 are provided without interrupting the burring edge 23, the melted wax can flow smoothly along the surface of the burring edge 23, and the wax can be easily spread over the entirety. In addition, the inclination of the fin sheet 10 is set to 60 degrees corresponding to the 30-degree positions of the brazing material insertion holes 41 and 42,
The brazing material insertion holes 41 and 42 can be placed at the highest position.

[0010]

According to the heat exchange fin according to the first aspect of the present invention , each of the upper and lower inserts is provided.
Dharma-type insertion holes with holes communicating with each other penetrate the fin sheet
At the same time, the constriction near the center of the Dharma-shaped insertion hole
The rim of the upper and lower insertion holes except for the burring edge is the burring edge, and
The bar on the same one side of the upper and lower insertion holes
Each brazing material insertion hole is set in contact with the outside of the ring edge.
When the water exchange pipe for heat exchange is inserted into the upper and lower insertion holes,
Then, insert the brazing material into the brazing material insertion hole and set it.
When the brazing material is inserted into the upper and lower holes
Occupy the highest position around
Therefore, the brazing of the water pipe and the fin sheet and the water pipe in the cracked part of the Dharma-type insertion hole is sufficiently secure.
Thus, it is possible to provide a heat exchange fin that is less likely to crack due to thermal stress or the like.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a heat exchange fin of the present invention.

FIG. 2 is a detailed view of a Dharma-type insertion hole.

FIG. 3 is a diagram showing a state of a heat exchange fin at the time of brazing.

FIG. 4 is a view showing an example of a conventional heat exchange fin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper water pipe 2 Lower water pipe 3 Brazing material 10 Fin sheet 20 Dharma type insertion hole 21 Upper insertion hole 22 Lower insertion hole 41 Brazing material insertion hole 42 Brazing material insertion hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho-59-29582 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F28F 1/32

Claims (1)

(57) [Claims] 1. A dharma in which upper and lower insertion holes communicate with each other.
A die insertion hole is penetrated through the fin sheet,
Peripheries of upper and lower insertion holes except for the constricted part near the center of the insertion hole
The edge is a burring edge, and the upper and lower insertion holes are the same.
A shape that touches the outside of the burring edge at the diagonally upper part on one side
The brazing material insertion hole is provided in each, and heat is inserted into the upper and lower insertion holes.
Insert the replacement water pipe and insert the brazing material through the hole.
C Insert the material and set it, then tilt the fin sheet to
Brazing material insertion hole occupies highest position around upper and lower insertion holes
Heat exchange fins brazed like this .