JP2956354B2 - Heat exchange fins - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange fin.

[0002]

2. Description of the Related Art Conventionally, for example, in a single-can, two-circuit type instantaneous heating type heat exchanger, a water exchange pipe for heat exchange of each circuit is connected to a flame from below in two stages, and is connected to a heat exchange fin. It was inserted and brazed. FIG. 5 shows an entire configuration diagram of a conventional heat exchange fin, and FIG. 6 shows details of a Dharma type insertion hole 20. 5 and 6, the heat exchange fin 10 is used.
A plurality of Dharma-type insertion holes 20 are formed in the hole. 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 communicate with each other. For example, a water exchange pipe A for heat exchange of a bath reheating circuit is inserted into the upper insertion hole 21, a water exchange pipe B for heat exchange of the hot water supply circuit is inserted into the lower insertion hole 22, and the two water pipes A and B abut. . And one brazing material insertion hole 31 is located on the upper insertion hole 21.
The brazing material insertion hole 3 is also formed on both shoulders of the lower insertion hole 22.
2, 33 are formed. The brazing material C is inserted in the brazing material insertion hole 3
1, 32 and 33 are melted when the water pipes A and B are brazed to the heat exchange fins. 40 is Dharma type insertion hole 20
Is a burring edge formed around the periphery. This burring edge 40 is located at the position of the brazing material insertion holes 32 and 33 of the lower insertion hole 22,
Once formed in a discontinued shape, the brazing material insertion hole 3
2, 33 are continuous with the lower insertion hole 22.

[0003]

However, in the conventional heat exchange fins, when the water exchange pipe B is inserted into the lower insertion hole 22 and when the pipe is expanded after the insertion, the lower insertion hole 22 and the brazing material are used. There is a disadvantage that the corners 11 generated by the insertion holes 32 and 33 are easily deformed, and that a part corresponding to the deformed corners 11 is not brazed well.

Accordingly, the present invention has been made to solve the above-mentioned conventional disadvantages and to provide a heat exchange fin having a Dharma-type insertion hole.
The object of the present invention is to provide a heat exchange fin that can be brazed to a heat exchange water pipe inserted into the Dharma-type insertion hole in a satisfactory manner with the Dharma-type insertion hole, and has high strength near the Dharma-type insertion hole and little deformation. .

[0005]

A heat exchange fin according to the present invention that achieves the above object is constructed such that the lower part of the upper insertion hole above the upper and lower two circular insertion holes and the upper part of the lower insertion hole are continuous. A plurality of Dharma-type insertion holes are formed, and a brazing material insertion hole for brazing a heat exchange water pipe inserted into the Dharma-type insertion hole is disposed around the Dharma-type insertion hole. A fin that forms a burring edge continuously around the entire periphery including the upper and lower communication portions of the darma-type insertion hole, and forms a burring edge formed in the lower insertion hole with an upper portion of the lower insertion hole. The lower insertion hole and the brazing insertion hole arranged around the lower insertion hole are provided outside the burring edge at the uppermost portion of both shoulders of the lower insertion hole.

[0006]

[Function] A continuous burring edge is formed without interruption on the entire periphery including the upper and lower communicating portions of the Dharma-type insertion hole, so that the strength of the entire periphery of the Dharma-type insertion hole is improved, and especially the Dharma-type insertion hole. A weak portion near the communicating portion of the upper and lower insertion holes is reinforced. Therefore, deformation or cracking when the heat exchange water pipe is inserted or the like is suppressed or prevented. On the other hand, the burring edge of the lower insertion hole is so set that the height of the edge is 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 Disturbance by the burring edge is minimized. Therefore, the brazing of the brazing to the inside of the burring edge is also improved, and brazing can be performed reliably.

[0007]

1 to 4 show an embodiment of the present invention.
2 is a front view of the entire 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 fin for heat exchange. A plurality of Dharma-type insertion holes 60 are formed in the heat exchange fin 50. Each Dharma type insertion hole 60
Is formed of a circular upper insertion hole 61 and a circular lower insertion hole 62, and is formed such that a lower portion of the upper insertion hole 61 and an upper portion of the lower insertion hole 62 communicate with each other. For example, a water exchange pipe A for heat exchange of a bath reheating circuit is inserted into the upper insertion hole 61, and a water exchange pipe B for heat exchange 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, and 73, and is melted when the water pipes A and B are brazed to the heat exchange fins 50. The above is the same as the above conventional example.

Reference numeral 80 denotes a burring edge formed around the Dharma-shaped insertion hole 60. The burring edge 80 is
Even at the positions of the brazing material insertion holes 72 and 73, the holes are formed continuously over the entire circumference without interruption. And the brazing material insertion holes 72 and 73 arranged on both shoulders of the lower insertion hole 62 are the lower insertion holes.
62 are formed in close proximity to the top of the burring edge 80 on both shoulders. In addition, the brazing material insertion hole formed in the upper insertion hole 61
Reference numeral 71 designates a portion of the hole so as to overlap a portion of the edge 80.
Since the burring edge 80 is formed continuously along the entire circumference without interruption, the strength of the darma-type insertion hole 60 against deformation and cracking is improved. In addition, heat is easily transmitted through the burring edge 80 as much as it is continuous.

The height of the burring edge 80 is not constant over the entire circumference of the Dharma-type insertion hole 60. The burring edge 80 of the lower insertion hole 62 is configured to be lower from the lower portion to the upper portion of the lower insertion hole 62 and to be minimized at the uppermost position 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 each of the brazing material insertion holes 71, 72, 73 are punched out first, and then the position and the dimension of the Dharma-type insertion hole 60 are indicated by dotted lines. Burring. As a result, the burma-type insertion hole 60 can be formed with the burring edge 80 having a height having a dimensional difference between the dotted line 60 and the solid line 90. As is clear from FIG. 4, the brazing material insertion hole 71 on the upper insertion hole 61 side.
Is partially hung on the burring rim 80. Burring edge
Since the height of 80 is set to be lower toward the upper part of the lower insertion hole 62, the lower insertion hole 62 having both brazing material insertion holes 72 and 73 is provided.
The height of the burring edge 80 is sufficiently low at the uppermost portion, so that the brazing is hardly hindered by the burring edge 80. That is,
The brazing passes sufficiently between the inner wall of the burring edge 80 and the heat exchange water pipe B beyond the low burring edge 80, so that brazing can be performed reliably. In addition, since the positions of the brazing material insertion holes 72 and 73 are provided at the uppermost portion of both shoulders of the lower insertion hole 62, brazing can be performed in a sufficiently wide range up to the vicinity of the uppermost portion of the lower insertion hole 62, and strength and heat transferability are not so much. Get better.

[0010]

According to the heat exchange fin according to the first aspect of the present invention, the present invention has the above-described configuration and operation, and is continuous without interruption in the entire circumference including the upper and lower communicating portions of the Dharma-type insertion hole. Since the burring edge is formed, the strength of the entire periphery of the Dharma-type insertion hole is improved, and particularly, a portion where the strength is weak near the communicating portion between the upper and lower insertion holes of the Dharma-type insertion hole is reinforced.
Therefore, deformation or cracking when the heat exchange water pipe is inserted or the like is suppressed or prevented. Also, the heat conduction by the burring edge is improved. In addition, the height of the burring edge of the lower insertion hole is set to be lower toward the top, so when brazing, the brazing material melted in the brazing material insertion hole at the top of both shoulders of the lower insertion hole. Is minimized from being disturbed by the burring edge. Therefore, the brazing of the brazing to the inside of the burring edge is also improved, and brazing can be performed reliably. Further, since the brazing material insertion hole is located at the uppermost portion of both shoulders of the lower insertion hole, the brazing range can be widened accordingly.

[Brief description of the drawings]

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

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

FIG. 3 is a sectional view taken along line II of FIG. 2;

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

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

FIG. 6 is a view showing details of a Dharma type insertion hole of a conventional heat exchange fin.

[Explanation of symbols]

 50 Heat exchange fins 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 Water exchange pipe for heat exchange

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F28F 1/32 B23K 1/00 330

Claims (1)

(57) [Claims] 1. A plurality of Dharma-type insertion holes formed so that a lower part of an upper one of upper and lower two circular insertion holes and an upper part of a lower one of the insertion holes are continuous, and are inserted through the Dharma-type insertion holes. A heat exchange fin in which brazing material insertion holes for brazing the heat exchange water pipes are arranged around the Dharma-type insertion holes, including the upper and lower communication portions of the Dharma-type insertion holes. A burring edge is formed continuously around the entire circumference, and the burring edge formed in the lower insertion hole is formed so that its height becomes lower toward the upper portion of the lower insertion hole, and is arranged around the lower insertion hole. The heat-exchanging fins are characterized in that the brazing holes to be made are provided outside the burring edges at the top of both shoulders of the lower hole.