JPH06288646A - Structure of fin of heat exchanger - Google Patents

Abstract

PURPOSE:To surely braze a fin to side walls of a heat exchange chamber by providing at both ends of the fin joining flanges extending at a right angle from the fin with each bent inward by a prescribed angle at the upper end. CONSTITUTION:At each of the two ends of a fin 1 a joining flange 5 bent at a right angle to the fin 1 is formed to the same height as the flanges at the edges of water tube-passing holes 2, 20 and the flanges at the edges of flanged openings 4. The upper end 51 of the joining flange 5 is cut off at a cut part 50 and the upper end 51 is bent by a prescribed angle toward the water tube- passing holes 2. Water tubes 9 are fitted respectively through the water tube- passing holes 2, 20 and filler metal is inserted into filler metal insertion holes 3 and, on the other hand, filter metal is placed in a groovelike part 7 formed between the upper end 51 of the joining flange 5 and the side wall 6 of the shell body and heated. As a result, brazing can be made with the molten filler metal flowing only into the space between the joining flange 5 and the side wall 6 of the shell body, not flowing into the combustion chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin structure of a heat exchanger having a large number of fins generally used for water heaters and the like.

[0002]

2. Description of the Related Art Generally, in a water heater, a heat exchanger including a plurality of water pipes arranged in parallel and a large number of fins having a substantially flat plate shape arranged orthogonal to the water pipes is used.
Both ends of the fin were fixed to the inner wall surface of the combustion chamber (heat exchange chamber) of the water heater by brazing. For example, as shown in FIGS. 7 to 9, the fin a is provided with a plurality (eight in FIG. 7) of water pipe through holes penetrating the water pipe e, and brazing is performed near the upper end of each water pipe through hole b. At this time, a brazing material through hole d for inserting the brazing material is formed, and both ends thereof are bent at right angles (see FIG. 8) and come into contact with the inner surface of the combustion chamber side wall, that is, the side wall f of the can body (see FIG. 9). ) A fixed flange c is formed.

[0003]

However, in the fin structure of the above conventional heat exchanger, the brazing material is inserted into the brazing material through hole d near the upper end of each water pipe through hole b in the brazing process, and the can is formed. Since the brazing material is placed on the corner g (see FIG. 9) formed by the inner surface of the body side wall f and the upper end of the fixing flange c that is in contact with the can side wall f and heated to perform brazing,
The molten brazing material not only flows into the gap between the inner surface of the can side wall f and the fixed flange c, but also flows to the combustion chamber side surface of the fixed flange c, that is, the surface not in contact with the can side wall f. As a result, there was a problem that it could cause defective brazing.

An object of the present invention is to provide a fin structure of a heat exchanger which can reliably braze the fin and the side wall of the heat exchange chamber.

[0005]

In order to achieve the above object, the fin structure of the heat exchanger of the present invention is installed in a heat exchange chamber such as a combustion chamber, and is installed in a heat exchange pipe such as a water pipe and a heat exchange pipe. In a heat exchanger provided with a plurality of fins which are arranged so as to cross each other and whose both ends are joined to the inner surface of the side wall of the heat exchange chamber, joint fins extending at right angles to the fins are provided at both ends of the fin, and the upper end of the joint flange is It is bent on the heat exchange tube side by a predetermined angle of less than 90 degrees, and it can be heated simply by placing the brazing material in the groove formed between the upper end of the joint flange and the side wall of the heat exchange chamber. The melted brazing material flows only between the joint flange and the side wall of the can body, so that the both can be securely joined.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 6. The fin 1 has a plurality (eight in this embodiment) of water pipe through-holes 2 and 20 formed in upper and lower two stages. A flange 21 having a predetermined height is formed on the periphery of each water pipe through hole 2, 20 (see FIG. 2), and a brazing material insertion hole 3 is formed at the upper end of each water pipe through hole 2, 20. , A notch 41 is provided between the adjacent water pipe through-holes 20, 20 in the lower stage, and the flanged opening 4 is continuous with the notch 41 and has two upper-stage water pipe through-holes 2, 2 and two lower-stage water pipes. A flange 40 is formed at a position equidistant from the four through holes 20 and 20, and a flange 40 having a predetermined height (the same height as the flange 21) is formed on the periphery of the flanged opening 4 (see FIG. 3). ), This flange 40 (cut at the connection with the notch 41) has the effect of a baffle. A baffler (for example, a wire wound in a coil shape) may be inserted into the flanged opening 4 in parallel with the water pipe.

Joint flanges 5 formed by bending the fins 1 at right angles to the fins 1 are formed at the same height as the flanges 21 at the periphery of the water pipe through holes 2 and 20 and the flange 40 at the periphery of the flanged opening 4. And the upper end 51 of the joint flange 5
Are separated by a notch 50, and the upper end 51 is bent inward, that is, toward the water pipe through hole 2 by a predetermined angle (less than 90 degrees) (see FIGS. 1 and 4).

In the brazing step, the water pipes 9 are fitted into the water pipe through holes 2 and 20, respectively, and the brazing material is inserted into the brazing material insertion hole 3 and, at the same time, between the upper end 51 of the joint flange 5 and the can body side wall 6. The brazing material is placed on the groove-shaped portion 7 formed in (1) (see FIG. 6) and heated. With this configuration, the brazing filler metal that is heated and melted
81 flows in only between the joint flange 5 and the can body side wall 6 (see FIG. 5), and both can be reliably joined.

Due to the provision of the flanged opening 4, the high temperature region in the middle portion, which is equidistant from the adjacent upper water pipe through holes 2 and 2 and the adjacent lower water pipe through holes 20 and 20, is removed and overheated. In addition to preventing the above, the length of the fin around the water pipe in the periphery (for example, approximately 3/4 yen on the lower side) excluding the upper portion of the lower water pipe through hole 20 can be formed to be a predetermined length low. The lower end of the above is not overheated, and a sufficiently high temperature gas is guided to the water pipe fitted in the upper water pipe through hole 2 by the flange 40 at the periphery of the flanged opening 4.

Although the above-described embodiment is a water heater, the present invention is not limited to a water heater, and can be applied to any apparatus in which a heat exchanger having fins is installed in a heat exchange chamber. is there.

[0011]

Since the present invention is constructed as described above, it is only necessary to place the brazing material in the groove formed between the upper end of the joint flange formed at both ends of the fin and the side wall of the combustion chamber. , The molten brazing material can be brazed without flowing out to the combustion chamber side, and reliable brazing joining can be performed.

[Brief description of drawings]

FIG. 1 is a front view of a fin according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged view of a main part of the fin according to the present invention.

FIG. 5 is an enlarged view of a main part of a fin showing a brazed state according to the present invention.

FIG. 6 is an enlarged view of a main part of the fin in the brazing process according to the present invention.

FIG. 7 is a front view of a conventional fin.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is an enlarged view of a main part of a fin showing a conventional brazing state.

[Explanation of symbols]

1 fin, 2 water pipe through hole (upper stage), 20 water pipe through hole (lower stage) 3 brazing material insertion hole, 4 baffle insertion hole, 5 joint flange, 50 notch 51 upper end of joint flange, 6 can side wall, 7 groove portion , 8
Brazing material, 9 water pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Ikeda 32 Akashi-cho, Chuo-ku, Hyogo Prefecture Noritsu Co., Ltd. (72) Inventor Satoshi Kazumaki 32 Akashi-cho, Chuo-ku Kobe, Hyogo Prefecture Noritsu Co., Ltd. (72) Inventor Takao Gamo 32 No. Akitsu-cho, Chuo-ku, Kobe-shi, Hyogo Within Noritsu Co., Ltd. (72) Inventor Hidekazu Fukui No. 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo (72) Inventor Eiji Kamiyoshi 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu (72) Inventor Hiroshi Kawaguchi 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu

Claims (1)

[Claims] 1. A heat exchanger provided in a heat exchange chamber, comprising: a heat exchange pipe; and a plurality of fins arranged to intersect with the heat exchange pipe and joined at both ends to an inner surface of a side wall of the heat exchange chamber. A fin structure for a heat exchanger, characterized in that joint flanges that extend at right angles to the fins are provided at both ends of the joint flange, and the upper ends of the joint flanges are bent inward at a predetermined angle.