JP3284695B2 - 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. 5 is a view showing an example of a conventional heat exchange fin. The prior art will be described with reference to this drawing. In a so-called one-can, two-circuit heat exchanger, a plurality of fin sheets are arranged at regular intervals, and two types of water exchange pipes for heat exchange are passed through the fin sheets. Is brazed. That is, in each fin sheet, a large number of dharma-type insertion holes 20 are formed, in which the lower part of the upper insertion hole 21 and the upper part of the lower insertion hole 22 communicate with each other so that the two water pipes 1 and 2 are inserted vertically. Is done. The water pipe 1 of, for example, a bath water heating circuit is inserted through the insertion hole 21 above the Dharma-type insertion hole 20, and the water pipe 2 of the hot water supply circuit is inserted through the lower insertion hole 22. The two water pipes 1, 2
The brazing between the fin sheet and the fin sheet is performed by providing a pair of brazing material insertion holes 31 at the top of the periphery of the insertion hole 21 above the Dharma-type insertion hole 20 in a form lacking a part of the burring edge 41. hole
Heating is performed by inserting the brazing material 3 into the tube 31 so that the water pipes 1 and 2 are in a horizontal state and the fin sheet is in a vertical state. As a result, the brazing material 3 melts, and the upper insertion hole is formed.
Flowing downward through the inner circumference of the inner hole 21, further downward through the inner periphery of the insertion hole 22 through the central constricted portion, the fin sheet and the water pipe at the inner circumference of the upper insertion hole 21 (upper burring edge 41). 1, the brazing of the upper and lower water pipes 1 and 2 at the central constriction, and the brazing of the fin sheet and the water pipe 2 at the inner periphery of the lower insertion hole 22 (lower burring edge 42). Done.

[0003]

However, in the conventional heat exchange fins described above, when brazing, the brazing melted in the upper brazing material insertion hole 31 moves along the inner periphery of the upper insertion hole 21. It flows down, but the space at the central constriction of the Dharma-shaped insertion hole 20
23 is large, so that the molten brazing material that has descended on the inner periphery of the upper insertion hole 21 tends to be interrupted at the space 23, so that the wax is sufficiently rotated between the two water pipes 1 and 2 in the central constriction. There were no shortcomings. There is also a problem that the wax does not flow between the inner periphery of the lower insertion hole 22 (the lower burring edge 42) and the lower water pipe 2.

Accordingly, the present invention solves the above-mentioned disadvantages of the prior art, and brazes the water pipes at the central constriction of the Dharma-type insertion hole, as well as the inner and lower peripheries of the lower insertion hole (lower burring edge). It is an object of the present invention to provide a heat exchange fin capable of performing brazing with a water pipe sufficiently.

[0005]

In order to achieve the above-mentioned object, a heat exchange fin according to the present invention has a large number of dalma-type insertion holes in which a pair of upper and lower insertion holes are communicated on the way. A heat exchange fin formed and having a brazing material insertion hole formed in a part of a periphery of the Dharma-type insertion hole, wherein a pair of lower ends of a burring edge formed in the insertion hole above the Dharma-type insertion hole. The part is made to penetrate deeply in the central constriction part of the Dharma-type insertion hole until it is close to the horizontal direction, and a pair of lower end parts thereof are in contact with the two water pipes that are inserted in contact with the upper and lower insertion holes. And a pair of upper ends of the lower burring edge are configured to be in contact with the upper burring edge and a water pipe inserted in contact with the lower insertion hole.

[0006]

A pair of heat exchange water pipes of one can and two circuit type are inserted through a pair of Dharma type insertion holes of a fin sheet in which a large number of heat exchangers are arranged and a brazing material is inserted into the Dharma type insertion hole. When it is inserted into the brazing material insertion hole formed in part of the peripheral edge and heated for brazing, the wax that has flowed down between the inner periphery of the upper insertion hole (upper burring edge) and the water pipe is Along the inner surface of the upper burring edge, it penetrates deeply into the central constriction of the Dharma-type insertion hole, and is formed between a pair of lower ends of the upper burring edge and upper and lower water pipes contacting the lower end. Is filled into small gaps. With this, the upper water pipe and the fin sheet are brazed at the inner periphery of the upper insertion hole (upper burring edge), and a pair of lower ends of the upper burring edge and the upper and lower water pipes are formed. By filling the small gap with the brazing, the brazing between the upper and lower water pipes is ensured. Further, the wax flows from the small gap into a second small gap formed between the pair of upper ends of the lower burring edge and the upper burring edge and the lower water pipe contacting the upper end, From the second gap, the water flows between the inner periphery of the lower insertion hole (lower burring edge) and the lower water pipe. Thus, the lower water pipe and the fin sheet are brazed at the inner periphery of the lower insertion hole (lower burring edge). In the configuration of the present invention, the lower end of the upper burring edge is in contact with the upper and lower water pipes,
When the upper end of the lower burring edge contacts the lower water pipe, the flow of the wax in the central constriction becomes smooth, and the gap formed in the central constriction of the Dharma-shaped insertion hole is very small. As a result, since there is no shortage of brazing, the brazing of each water pipe to the fin sheet and the brazing of the upper and lower water pipes in the Dharma-type insertion hole are ensured.

[0007]

FIG. 1 is a front view schematically showing a heat exchange fin showing an embodiment of the present invention, and FIG. 2 is a front view showing details of a Dharma type insertion hole which is a main part of the heat exchange fin of the present invention. FIG. 3 is a plan view of the Dharma-type insertion hole. FIG. 4 is a front view of a pretreatment hole for forming a Dharma-type insertion hole.

An embodiment will be described with reference to FIGS. The lower part of the upper insertion hole 51 and the upper part of the lower insertion hole 52 communicate with the fin sheet 10 in a relatively low state so that the two water pipes 1 and 2 are inserted vertically. A large number of daruma-shaped insertion holes 50 are formed. And this Dharma type insertion hole
For example, a water pipe 1 of a bath reheating circuit is inserted into the upper insertion hole 51 of the 50, and a water pipe 2 of a hot water supply circuit is inserted into the lower insertion hole 52. The upper and lower insertion holes 51 and 52 are provided with an upper burring edge 71 and a lower burring edge 72, respectively. A brazing material insertion hole 61 is provided at the uppermost portion of the upper insertion hole 51 so as to be in contact with the outer side of the upper burring edge 71, and the brazing material 3 inserted into the brazing material insertion hole 61 is By providing a cutout 71a in a part of the upper burring edge 71, it is possible to directly contact the water pipe 1.

The upper burring edge 71 is formed to penetrate deeply in the central constriction 53 of the Dharma-type insertion hole 50. That is, referring to FIG. 2, a pair of lower ends 71b, 71b of the upper burring edge 71 are deeply penetrated into the central constricted portion 53 until they are close to each other in the horizontal direction. Each of the water pipes 1 and 2 that are inserted in contact with the insertion holes 51 and 52 are configured to be in contact with each other. Also, a pair of upper ends 72b, 72b of the lower burring edge 72
Are configured to be in contact with the upper burring edge 71 and the water pipe 2 inserted in contact with the lower insertion hole 52, respectively.

A pair of lower ends 71 of the upper burring edge 71
b and 71b penetrate deeply into the central constriction 53 until they are close to each other in the horizontal direction, and a pair of lower ends 71b thereof are inserted into the upper and lower through holes 51 and 52 with respect to each of the water pipes 1 and 2 inserted therethrough. Te, by configuring so as to contact, at the central constricted portion 53, in the burring edges 71 of the upper and upper and lower water pipe 1, a pair of small first gap S ₁ is formed between them. Also, a pair of upper ends 72b, 72 of the lower burring edge 72
b is configured to be in contact with the upper burring edge 71 and the water pipe 2 that is inserted in contact with the lower insertion hole 52 so that the lower burring edge 72 and the upper in burring edges 71 and the water pipe 2 below, a pair of small second gap S ₂ is formed between them.

Prior to the formation of the Dharma-type insertion hole 50 having the upper and lower burring edges 71 and 72, a punched hole 80 as shown by a solid line in FIG. It can be obtained by burring to the position shown.

[0012] A pair of heat exchange water pipes 1 of two-circuit type with one can,
2 is inserted through a pair of upper and lower insertion holes 51 and 52 of the Dharma-type insertion hole 50 of the fin sheet 10 in which a number of sheets are aligned and the brazing material 3 is inserted through a brazing material insertion hole 61 of the upper insertion hole 51. Then, when heating for brazing, the brazing material 3 is melted,
It flows between the inner circumference of the upper insertion hole 51 (the upper burring edge 71) and the upper water pipe 1, and along the inner surface of the upper burring edge 71, deeply into the central constriction 53 of the Dharma-type insertion hole 50. penetrated, is filled into small first gap S ₁ formed between the pair of lower end 71b of the burring edges 71 of the upper and upper and lower water pipe 1, 2 in contact with its lower portion 71b. As a result, the upper water pipe 1 at the inner periphery of the upper insertion hole 51 (the upper burring edge 71) is formed.
By a with brazing of the fin sheet 10 is made, a small first row in the gap S ₁ composed of a pair of lower end 71b of the burring edges 71 on the upper and lower water pipe is filled The brazing of the upper and lower water pipes 1 and 2 is ensured. Further, from the small first gap S ₁ ,
A pair of upper ends 72b of the lower burring edge 72 and the upper ends thereof
Second flows into a small gap S _2, the second from the gap S _2, insertion holes 52 (burring edge of the lower bottom constituted between the burring edges 71 and the water pipe 2 below the upper contact with 72b 7
It flows between the inner circumference of 2) and the lower water pipe 2. Thus, the lower water pipe 2 and the fin sheet 10 are brazed at the inner periphery of the lower insertion hole 52 (lower burring edge 72).

[0013]

According to the heat exchange fin according to the first aspect of the present invention, a pair of lower ends of a burring edge formed in the insertion hole above the Dharma-type insertion hole. At a central constriction of the Dharma-type insertion hole so as to penetrate deeply until it is close to the horizontal direction, and a pair of lower end portions thereof are in contact with the two water pipes which are inserted in contact with the upper and lower insertion holes. Also, since the pair of upper ends of the lower burring edge are configured to be in contact with the upper burring edge and the water pipe inserted in contact with the lower insertion hole, the flow of the wax in the central constriction portion Can be made smooth, and the gap formed in the central constriction of the Dharma-type insertion hole can be made very small so that shortage of the solder does not occur. Therefore, according to the heat exchange fin of the present invention, , Dharma type Brazing between the water pipe and the fins sheet, and brazing between the upper and lower water pipe becomes reliably in throughbore.

[Brief description of the drawings]

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

FIG. 2 is a front view showing details of a Dharma type insertion hole which is a main part of the heat exchange fin of the present invention.

FIG. 3 is a plan view of a Dharma-type insertion hole.

FIG. 4 is a front view of a pretreatment hole for forming a Dharma-type insertion hole;

FIG. 5 is a view showing an example of a conventional heat exchange fin.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Water pipe 2 Water pipe 3 Brazing material 10 Fin sheet 50 Dharma type insertion hole 51 Upper insertion hole 52 Lower insertion hole 53 Center constriction 61 Brazing material insertion hole 71 Upper burring edge 71b Lower end 72 Lower burring edge 72b Upper end S ₁ First gap S ₂ Second gap

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-59-189291 (JP, A) JP-A-59-29582 (JP, U) JP-A-3-13066 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) F28F 1/32 F24H 1/00

Claims (1)

(57) [Claims] 1. A large number of darma-type insertion holes, in which a pair of upper and lower insertion holes are communicated on the way, are formed in a fin sheet, and a brazing material insertion hole is formed at a part of a peripheral edge of the darma-type insertion hole. In the formed heat exchange fin, the pair of lower ends of the burring edges formed in the insertion hole above the Dharma-type insertion hole are deepened until they are close to the horizontal direction at the central constriction of the Dharma-type insertion hole. And a pair of lower ends thereof are configured to be in contact with the two water pipes that are inserted in contact with the upper and lower insertion holes, and a pair of upper ends of a lower burring edge are connected to the upper burring edge and the lower burring edge. The heat exchange fin is configured to be in contact with a water pipe inserted in contact with the insertion hole.