JPH0763491A - Heat exchanging fin - Google Patents

Abstract

PURPOSE:To provide a heat exchanging fin in which brazing of water flow tubes at a central neck of a drum type insertion hole and brazing of an inner periphery of a lower insertion hole (lower barring edge) to a lower water flow tube can be effectively executed. CONSTITUTION:A heat exchanging fin comprises many drum type insertion holes 50 of a shape in which a pair of upper and lower insertion holes 51, 52 communicate on the way and which are formed at a fin sheet 10, and a brazed material insertion hole 61 formed partly at a peripheral edge of the hole 50. A pair of a lower end 71b of the edge 71 formed at the hole 51 on the hole 50 is deeply introduced to the vicinity of a horizontal direction at a central neck 53 of the hole 50, and brought into contact with both water flow tubes 1, 2 inserted in contact with the holes 51, 52. Further, a pair of upper ends 72b of the edge 72 is brought into contact with the tube 2 inserted in contact with the hole 52 at the upper edge 71.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to heat exchange fins.

[0002]

2. Description of the Related Art FIG. 5 is a view showing an example of a conventional heat exchange fin. The conventional technique will be described with reference to this figure. In a so-called 1-can 2-circuit type heat exchanger, a plurality of fin sheets are arranged at regular intervals, and two types of water exchange pipes for heat exchange are penetrated through the fin sheets. Brazed with. That is, each fin sheet has 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 communicate with each other so that the two water pipes 1 and 2 come into contact with each other vertically. To be done. Then, for example, the water passage pipe 1 of the bath heating circuit is inserted into the insertion hole 21 above the dharma type insertion hole 20, and the water pipe 2 of the hot water supply circuit is inserted into the lower insertion hole 22. The two water pipes 1, 2
For brazing the fin sheet with the fin sheet, a pair of brazing material insertion holes 31 are provided at the top of the peripheral edge of the insertion hole 21 above the dharma type insertion hole 20 so that a part of the burring edge 41 is cut off. hole
The brazing filler metal 3 is inserted into 31 and the water pipes 1 and 2 are heated in such a manner that the water pipes 1 and 2 are in a horizontal state and the fin sheets are in a vertical state. As a result, the brazing material 3 melts and the upper insertion hole
It flows downward on the inner periphery of 21 and flows further down the inner periphery of the lower insertion hole 22 through the central constriction, and at the inner periphery of the upper insertion hole 21 (upper burring edge 41), the fin sheet and the water pipe. 1 and brazing with the upper and lower water pipes 1 and 2 at the central constriction, and the fin sheet and the water pipe 2 at the inner circumference of the lower insertion hole 22 (lower burring edge 42), respectively. Done.

[0003]

However, in the above-mentioned conventional heat exchange fin, when brazing, the wax melted in the upper brazing material insertion hole 31 runs along the inner circumference of the upper insertion hole 21. A space at the central constriction of the Dharma type insertion hole 20 that flows down
23 is large, and therefore, the molten brazing material that has descended on the inner periphery of the upper insertion hole 21 is likely to be interrupted at the space 23, so that the brazing material sufficiently flows between the two water pipes 1 and 2 in the central constriction. There were no drawbacks. Further, there is a problem that wax does not flow between the inner periphery of the lower insertion hole 22 (lower burring edge 42) and the lower water pipe 2.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art by brazing the water pipes in the central constriction of the Dharma type insertion hole, and the inner circumference and the lower side of the lower insertion hole (lower burring edge). An object of the present invention is to provide a heat exchange fin that can be brazed with a water pipe sufficiently reliably.

[0005]

In order to achieve the above object, the heat exchanging fin of the present invention has a large number of daruma type insertion holes in which a pair of upper and lower insertion holes are communicated with each other in the middle of the fin sheet. A fin for heat exchange, which is formed and has a brazing material insertion hole formed in a part of the peripheral edge of the dharma type insertion hole, and a pair of lower ends of burring edges formed in the insertion hole above the dharma type insertion hole. Part of the dharma-type insertion hole is deeply penetrated until it becomes close to the horizontal direction in the central constriction part, and the pair of lower end portions of the dharma-type insertion hole are in contact with the water passage pipes inserted into the upper and lower insertion holes. In addition, a pair of upper end portions 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 into the pair of insertion holes of the Daruma type insertion hole of the fin sheet in which a large number of sheets are aligned, and the brazing material is inserted into the insertion hole of the Daruma type insertion hole. When it is inserted into the brazing material insertion hole formed in a part of the peripheral edge and heated for brazing, the wax flowing down between the inner circumference of the upper insertion hole (upper burring edge) and the water pipe is , Along the inner surface of the upper burring edge, penetrates deeply into the central constriction of the Dharma type insertion hole, and is formed between them by a pair of lower ends of the upper burring edge and upper and lower water pipes in contact with the lower ends. Filled into small gaps. As a result, the upper water passage and the fin sheet are brazed at the inner circumference of the upper insertion hole (upper burring edge), and the lower water pipe is composed of a pair of lower end portions of the upper burring edge and upper and lower water pipes. By filling the small gap formed with wax with each other, the brazing of the upper and lower water pipes is surely performed. 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 in contact with the upper edge and the lower water pipe between them. From the second gap, it flows between the inner periphery of the lower insertion hole (lower burring edge) and the lower water pipe. As a result, 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,
The upper end of the lower burring edge is in contact with the lower water pipe, so that the flow of wax in the central constriction becomes smooth, and the gap formed in the central constriction of the Dharma type insertion hole is very small. Since the brazing shortage does not occur, the brazing of each water pipe and the fin sheet in the dharma type insertion hole and the brazing of the upper and lower water pipes are surely performed.

[0007]

FIG. 1 is a front view showing an outline of 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 portion 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 portion. FIG. 4 is a front view of a pretreatment hole portion for forming the dharma type insertion hole portion.

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 are relatively overlapped and communicate with each other so that the two water pipes 1 and 2 are vertically inserted into the fin sheet 10. A large number of dharma type insertion holes 50 are formed. And this Dharma type insertion hole
For example, the water passage pipe 1 of the bath reheating circuit is inserted into the upper insertion hole 51 of 50, and the water passage pipe 2 of the hot water supply circuit is inserted into the lower insertion hole 52. An upper burring edge 71 and a lower burring edge 72 are provided in the upper and lower insertion holes 51 and 52, respectively. A brazing material insertion hole 61 is provided at the uppermost part of the upper insertion hole 51 so as to contact the outside of the upper burring edge 71, and the brazing material 3 inserted in the brazing material insertion hole 61 is A notch 71a is provided in a part of the upper burring edge 71 so that the burring edge 71 can directly contact the water pipe 1.

The upper burring edge 71 is formed so as to penetrate deeply in the central constricted portion 53 of the Dharma type insertion hole 50. That is, referring to FIG. 2, the pair of lower end portions 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, and the pair of lower end portions 71b, It is configured so as to come into contact with the respective water passage pipes 1 and 2 which are inserted in contact with the insertion holes 51 and 52. Also, a pair of upper ends 72b, 72b of the lower burring edge 72
Is configured to come into 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 end portions 71 of the upper burring edge 71.
b, 71b penetrate deeply into the central constricted portion 53 until they become close to the horizontal direction, and the pair of lower end portions 71b are inserted into the water pipes 1 and 2 which are inserted in contact with the upper and lower insertion holes 51 and 52, respectively. In the central constricted portion 53, the upper burring edge 71 and the upper and lower water passages 1 and 2 form a pair of small first gaps S ₁ therebetween. Also, a pair of upper end portions 72b, 72b of the lower burring edge 72
By configuring b so as 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, respectively, at the central constricted portion 53, the lower burring edge 72 and the upper burring edge 72 are formed. The burring edge 71 and the lower water pipe 2 form a pair of small second gaps S ₂ therebetween.

The formation of the Dharma type insertion hole 50 having the upper and lower burring edges 71 and 72 as described above is performed by forming a punching hole 80 as shown by a solid line in FIG. It can be obtained by burring to the position shown.

A pair of water exchange pipes 1 for heat exchange of one can and two circuit type,
2 is inserted into 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 large number of sheets are aligned, and the brazing material 3 is inserted into the brazing material insertion hole 61 of the upper insertion hole 51. Then, when heating for brazing, the brazing material 3 is melted,
Flows between the inner circumference of the upper insertion hole 51 (upper burring edge 71) and the upper water passage 1 and is deep along the inner surface of the upper burring edge 71 in the central constricted portion 53 of the Dharma type insertion hole 50. It invades and fills a small first gap S ₁ formed between the pair of lower end portions 71b of the upper burring edge 71 and the upper and lower water pipes 1 and 2 in contact with the lower end portions 71b. As a result, the upper water pipe 1 is provided at the inner circumference of the upper insertion hole 51 (upper burring edge 71).
And the fin sheet 10 are brazed, and the small first gap S ₁ formed by the pair of lower end portions 71b of the upper burring edge 71 and the upper and lower water pipes is filled with braze. The brazing of the upper and lower water pipes 1 and 2 is surely performed. Further, the wax is from the small first gap S ₁
A pair of upper ends 72b of the lower burring edge 72 and the upper ends thereof
It flows into a _second small gap S ₂ that is formed between the upper burring edge 71 that contacts 72b and the lower water passage 2 and from the second gap S ₂ to the lower insertion hole 52 (the lower burring edge). 7
It flows between the inner circumference of 2) and the water pipe 2 below. As a result, the lower water passage 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 of the first aspect of the present invention, the pair of lower end portions of the burring edge formed in the insertion hole above the Dharma type insertion hole is provided. Is deeply penetrated until it becomes close to the horizontal direction in the central constriction portion of the dharma-type insertion hole, and the pair of lower end portions thereof are in contact with both water passage pipes inserted in contact with the upper and lower insertion holes. Moreover, since the pair of upper end portions 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 wax in the central constricted portion Can be made smoother, and the gap formed in the central constriction portion of the dharma type insertion hole can be made extremely small to prevent wax shortage. 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 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 portion which is a main portion of the heat exchange fin of the present invention.

FIG. 3 is a plan view of a dharma type insertion hole portion.

FIG. 4 is a front view of a pretreatment hole portion for forming a dharma type insertion hole portion.

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

[Explanation 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 Burring edge 71b Lower end 72 Lower burring edge 72b Upper end S ₁ First gap S ₂ Second gap

Claims (1)

[Claims] 1. A plurality of daruma-type insertion holes having a shape in which a pair of upper and lower insertion holes communicate with each other are formed in the fin sheet, and brazing material insertion holes are formed in a part of the periphery of the dharma-type insertion hole. In the formed heat exchange fin, a pair of lower end portions of the burring edges formed in the insertion hole above the dharma type insertion hole is deepened until it becomes closer to the horizontal direction in the central constricted portion of the dharma type insertion hole. The pair of lower end portions of the lower burring edge and the upper end portion of the lower burring edge are formed so as to come into contact with both water passage pipes that are inserted into the upper and lower insertion holes. A fin for heat exchange, which is configured to come into contact with a water pipe that is inserted in contact with the insertion hole of the heat exchange fin.