JPH05302790A - Heat exchanging fin - Google Patents

Abstract

PURPOSE:To obtain a heat exchanging fin, capable of wellbrazing a heat exchanging water conducting tube which penetrates through tumbler type penetrating holes to the fin and having a high strength near the tumbler type penetrating holes while small in the deformation of the same. CONSTITUTION:A plurality of tumbler type penetrating holes 60, constituted so that the lower part of a penetrating hole 61 of two sets upper and lower circular penetrating holes is continuous to the upper part of a lower penetrating hole 62, are formed on a heat exchanging fin while brazing material penetrating holes 71, 72, 73 for brazing heat exchanging water conducting pipes A, B penetrated through the tumbler type penetrating holes are arranged around the tumbler penetrating holes 60. A buring rim 80 is formed continuously around the whole periphery of the tumbler type penetrating holes 60 including the communicating part between the upper hole and the lower hole white the height of the buring rim 80, formed around the lower penetrating hole 62, is formed so as to be lower than the height of the rim around the upper part of the penetrating hole 62 and the brazing penetrating holes 72, 73, arranged around the lower penetrating hole 62, are provided at the outside of the uppermost burning rim 80 of both shoulders of the lower penetrating hole 62.

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 Conventionally, for example, in a one-can two-circuit instantaneous heating type heat exchanger, heat exchange water passage pipes of each circuit are contacted in two upper and lower stages with respect to a flame from below to form heat exchange fins. It was inserted and brazed. FIG. 5 shows the overall configuration of a conventional heat exchange fin, and FIG. 6 shows the details of the dharma type insertion hole 20. In FIGS. 5 and 6, the heat exchange fin 10 is used.
A plurality of dharma type insertion holes 20 are formed in the. Each dharma type insertion hole 20 consists of an upper insertion hole 21 and a lower insertion hole 22,
The lower part of the upper insertion hole 21 and the upper part of the lower insertion hole 22 are formed so as to communicate with each other. For example, the water exchange pipe A for heat exchange of the bath reheating circuit is inserted in the upper insertion hole 21, and the water exchange pipe B for heat exchange of the hot water supply circuit is inserted in the lower insertion hole 22 so that both the water pipes A and B abut. .. And the brazing material insertion hole 31 is 1 above the upper insertion hole 21.
Individually formed, and brazing material insertion holes 3 on both shoulders of the lower insertion hole 22
2, 33 are formed. The brazing material C is the brazing material insertion hole 3
1, 32, 33, and melted when brazing the water pipes A, B to the heat exchange fins. 40 is a dharma type insertion hole 20
It is a burring edge formed around the. This burring edge 40 is at the position of the brazing material insertion holes 32, 33 of the lower insertion hole 22,
Once formed into a discontinuous shape, the brazing material insertion hole 3
2 and 33 are continuous with the lower insertion hole 22.

[0003]

However, in the above-mentioned conventional heat exchange fin, when the heat exchange water passage pipe B is inserted into the lower insertion hole 22 and when expanded after the insertion, the lower insertion hole 22 and the brazing material are provided. There is a drawback that the corner portion 11 generated by the insertion holes 32 and 33 is easily deformed, and therefore a portion corresponding to the deformed corner portion 11 is not brazed well.

Therefore, the present invention solves the above-mentioned conventional drawbacks, and in a heat exchange fin having a dharma type insertion hole,
The purpose of the present invention is to provide a heat exchange fin which can be brazed well in the dharma type insertion hole and which has good strength and little deformation near the dharma type insertion hole. ..

[0005]

Means for Solving the Problems A heat exchange fin of the present invention which achieves the above object is constructed such that the lower part of the upper through hole and the upper part of the lower through hole are continuous. A plurality of dharma type insertion holes are formed, and a brazing material insertion hole for brazing the heat exchange water pipe inserted in the dharma type insertion hole is arranged around the dharma type insertion hole. A fin that forms a burring edge continuously around the entire circumference including the upper and lower communication portions of the dharma type insertion hole, and forms the burring edge formed in the lower insertion hole above the lower insertion hole. It is characterized in that the brazing insertion holes arranged so as to have a lower height and arranged around the lower insertion hole are provided outside the burring edges at the uppermost portions of both shoulders of the lower insertion hole.

[0006]

[Operation] Since the continuous burring edge is formed without interruption in the entire circumference including the upper and lower communication portions of the dharma type insertion hole, the strength of the entire rim of the dharma type insertion hole is improved, especially the dharma type insertion hole. The weaker portions near the communicating portions of the upper and lower insertion holes are reinforced. Therefore, deformation and cracks at the time of inserting the water pipe for heat exchange are suppressed or prevented. On the other hand, the burring edge of the lower insertion hole is designed so that the edge height becomes lower toward the upper part, so when brazing, the wax melted in the brazing material insertion hole at the top of both shoulders of the lower insertion hole Interference with the burring edge is minimized. Therefore, the brazing of the brazing material to the inside of the burring edge becomes good, and brazing can be reliably performed.

[0007]

1 to 4 show an embodiment of the present invention.
2 is a front view of the whole heat exchange fin, FIG. 2 is a front view of a main part of the heat exchange fin, FIG. 3 is a sectional view taken along the line II of FIG. 2, and FIG. 4 is a punched state before forming a burring edge. It is a figure which shows the heat exchange fin. A plurality of dharma type insertion holes 60 are formed in the heat exchange fin 50. Each Dharma type insertion hole 60
Is composed of a circular upper insertion hole 61 and a circular lower insertion hole 62, and is formed such that the lower portion of the upper insertion hole 61 and the upper portion of the lower insertion hole 62 are in communication. For example, the heat exchange water passage A of the bath reheating circuit is inserted into the upper insertion hole 61, and the heat exchange water passage B of the hot water supply circuit is inserted into the lower insertion hole 62. One brazing material insertion hole 71 is formed on the upper insertion hole 61, and brazing material insertion holes 72 and 73 are formed on both shoulders of the lower insertion hole 62. The brazing material C is inserted into the brazing material insertion holes 71, 72, 73 and melted when the water pipes A, B are brazed to the heat exchange fins 50. The above is the same as the above-mentioned conventional example.

Reference numeral 80 denotes a burring edge formed around the dharma type insertion hole 60, and this burring edge 80 is the lower insertion hole 62.
Even at the positions of the brazing material insertion holes 72 and 73, the brazing material insertion holes 72 and 73 are continuously formed all around without interruption. And the brazing material insertion holes 72 and 73 arranged on both shoulders of the lower insertion hole 62 are lower insertion holes.
Proximal to the outermost burring edge 80 on both shoulders of 62. Also, a brazing material insertion hole formed in the upper insertion hole 61
71 is designed so that a part of the hole overlaps a part of the edge 80.
Since the burring edge 80 is formed continuously along the entire circumference without interruption in the middle, the strength against deformation and cracking of the dharma type insertion hole 60 is improved. In addition, heat is more likely to be transferred through the burring edge 80 due to the continuity.

The height of the burring edge 80 is not constant along the entire circumference of the dharma type insertion hole 60. The burring edge 80 of the lower insertion hole 62 is configured to become lower from the lower portion of the lower insertion hole 62 to the upper portion thereof, and is configured to be minimum at the uppermost positions of both shoulders of the lower insertion hole 62. .. That is, as shown in FIG. 4, the base hole 90 of the dharma-type insertion hole 60 and the brazing material insertion holes 71, 72, 73 are first punched out, and then the position and hole size of the dharma-type insertion hole 60 are indicated by dotted lines. Burr to. As a result, the burmer edge 80 having a height having a dimensional difference between the dotted line 60 and the solid line 90 can be configured as the Dharma type insertion hole 60. As is apparent from FIG. 4, the brazing material insertion hole 71 on the upper insertion hole 61 side
Partly hangs on the burring edge 80. Burring edge
Since the height of 80 becomes lower toward the upper part of the lower insertion hole 62, the lower insertion hole 62 with both brazing material insertion holes 72, 73
The height of the burring edge 80 is sufficiently low at the top of the so that brazing is hardly disturbed by the burring edge 80. That is,
The brazing is sufficiently passed around the low burring edge 80 and between the inner wall of the burring edge 80 and the heat exchange water passage B so that brazing can be reliably performed. Also, the brazing material insertion holes 72 and 73 are located at the uppermost portions of both shoulders of the lower insertion hole 62, so brazing can be performed in a sufficiently wide range up to the uppermost part of the lower insertion hole 62, and strength and heat transferability are only that much. Get better.

[0010]

According to the heat exchange fin of the present invention, the present invention has the above-described structure and operation. The heat exchange fin is continuous without interruption over the entire circumference including the upper and lower communication portions of the dharma type insertion hole. Since the burring edge is formed, the strength of the entire peripheral edge of the dharma-type insertion hole is improved, and especially the weak portions near the communication portions of the upper and lower insertion holes of the dharma-type insertion hole are reinforced.
Therefore, deformation and cracks at the time of inserting the water pipe for heat exchange are suppressed or prevented. Further, the heat conduction by the burring edge is also improved. In addition, since the burring edge of the lower insertion hole is designed to have a lower height toward the upper part, when brazing, the brazing material melted in the brazing material insertion hole at the top of both shoulders of the lower insertion hole is brazed. Is minimally disturbed by the burring edge. Therefore, the brazing of the brazing material to the inside of the burring edge becomes good, and brazing can be reliably performed. Further, since the brazing material insertion holes are located at the uppermost portions of both shoulders of the lower insertion hole, the brazing range can be widened accordingly.

[Brief description of drawings]

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

FIG. 2 is a front view of a main part of a heat exchange fin.

3 is a cross-sectional view taken along the line I-I of FIG.

FIG. 4 is a diagram showing a heat exchange fin in a punched state before forming a burring edge.

FIG. 5 is an overall configuration diagram of a conventional heat exchange fin.

FIG. 6 is a diagram showing details of a dharma type insertion hole of a conventional heat exchange fin.

[Explanation of symbols]

 50 Heat exchange fin 60 Dharma type insertion hole 61 Upper insertion hole 62 Lower insertion hole 71, 72, 73 Brazing material insertion hole 80 Burring edge A, B Heat exchange water pipe

Claims (1)

[Claims] 1. A plurality of dharma-type insertion holes configured such that the lower part of the upper insertion hole of the upper and lower two circular insertion holes and the upper part of the lower insertion hole are formed continuously, and the dharma-type insertion hole is inserted. A heat exchange fin in which a brazing material insertion hole for brazing the heat exchange water passage provided is arranged around the dharma type insertion hole, and the upper and lower communication parts of the dharma type insertion hole are also included. A burring edge is formed continuously over the entire circumference, and the burring edge formed in the lower insertion hole is arranged so that the height becomes lower toward the upper part of the lower insertion hole and is arranged around the lower insertion hole. The heat exchange fin, wherein the brazed insertion hole is provided outside the burring edges of the uppermost portions of both shoulders of the lower insertion hole.