JPH0744908Y2 - Heat exchanger for 1-can 2-circuit water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heat exchanger of a one-can two-circuit water heater formed by brazing two heat transfer tubes to a large number of common fins.

<Prior Art> Conventionally, in this type, two heat transfer tubes and a large number of fins are integrally formed by brazing, so that a fin-shaped insertion hole through which the two heat transfer tubes are inserted. And, a notch for inserting a brazing material is formed on both sides of the upper center and the constricted part in the middle connected to this insertion hole, and after inserting the heat transfer tube into the fin, one brazing material is inserted into each notch. And brazing in the furnace in a high temperature furnace.

<Problems to be solved by the invention> By the way, in this conventional type, the brazing material does not enter properly between the heat transfer tube and the fins and the heat transfer tube, causing a brazing failure, which hinders thermal transfer. There was a big problem that the exchanger itself was damaged.

<Means for Solving Problems> In order to solve the above-mentioned drawbacks by paying attention to this point, the present invention has, in particular, two heat transfer tubes connected to different flow paths, and both heat transfer tubes are provided. In a heat exchanger of one-can-two-circuit type, which is installed in parallel and brazed to a large number of common fins, the fins are provided with daruma-shaped insertion holes into which both heat transfer tubes are inserted, and A plurality of cutouts are provided so as to be connected to the insertion holes, and two brazing materials are inserted in the cutouts on both sides, and one brazing material has its horizontal center line on the extension line of the approaching portions of both heat transfer tubes. Then, the brazing material is inserted in contact with both the heat transfer tubes, and the other brazing material is inserted so that its vertical center line is located closer to both the heat transfer tubes than the edge of the notch.

<Operation> First, after the brazing material 15 is inserted into the notch 13 in the upper part of the heat transfer tube 9,
Two brazing materials 16 and 17 are inserted into the notches 14 on both sides of the constricted portion near the joint of the heat transfer tubes 8 and 9, and one brazing material 16
Is positioned so that its horizontal center line A is on the extension of the approaching portion 18 of both heat transfer tubes 8 and 9 and is in contact with both heat transfer tubes 8 and 9.
The other brazing material 17 has its vertical center line B at the edge 19 of the notch 14.
When the heat transfer tubes 8 and 9 are positioned so as to project further, and the heat transfer tubes 8 and 9 are placed in a furnace and heated to a high temperature, the upper brazing material 15 is melted and the gap between the upper heat transfer tubes 9 and the fins 10 is filled. The remainder flows into the central notch 14, where it is once dammed by the brazing material 16 and then flows between the two heat transfer tubes 8 and 9 as the brazing material 16 melts, and the space between the two heat transfer tubes 8 and 9 is sufficiently increased. Good brazing with brazing material, and brazing material 17 left in the notch 14
The vertical center line B is outside the edge 19 of the cutout portion 14, and most of them are on both sides of the heat transfer tubes 8 and 9, so that the molten brazing material 17 does not remain in the cutout portion 14 and smoothly moves downward. Since it flows into the gap between the heat transfer tube 8 and the fin 10 and brazes the space between these wells, good brazing can be performed as a whole and a strong heat exchanger can be provided without fear of damage.

<Embodiment> Next, the heat exchanger of the one-can two-circuit water heater according to the present invention will be described with reference to a preferred embodiment shown in the drawings.

Reference numeral 1 denotes a gun-type burner that uses petroleum as a fuel, and is provided downward in the upper part of the combustion chamber 2.

Reference numeral 3 denotes a one-can two-circuit type heat exchanger that is provided in the upper part of the combustion chamber 2 and is heated by the burner 1. The hot water supply circuit 4 connects the city water to the hot water tap, and the water in the bathtub 5 is circulated in the circulation pump 6. It is connected to a circulation circuit 7 that circulates by driving.

The heat exchanger 3 has a structure in which a heat transfer tube 8 connected to a hot water supply circuit 4 and a heat transfer tube 9 connected to a circulation circuit 7 are vertically arranged side by side on a large number of common fins 10 ... It has been configured.

Furthermore, this brazing is a fin color for each fin 10.
The heat transfer pipes 8 and 9 are inserted into the dharma-shaped insertion hole 12 formed with 11.
And a notch portion 13 on each side of the constricted portion of the insertion hole 12 and a portion which is connected to the insertion hole 12 and is located above in the furnace.
14 and a piece of brazing material 15 in the upper notch 13
2 brazing materials 16 in each notch 14 on both sides.
・ 17 is inserted, and one brazing material 16 has its horizontal center line A on the extension line of the approaching portion 18 of both heat transfer tubes 8.9.
The brazing material 17 on the other side is positioned so that its vertical center line B is located on the both sides of the heat transfer tubes 8 and 9 from the end edge 19 of the cutout portion 14 in the state of FIG. By putting it in a container and heating it at a high temperature, the state shown in FIG.

This is because by heating at a high temperature, the brazing material 15 inserted into the upper cutout 13 is first melted and flows into the gap between the heat transfer tube 9 and the fins 10 and the fin collar 11 in the upper part, and brazing is properly performed between them. At the same time, the remaining brazing material 15 flows into the notch 14 of the constricted portion, where it is once stopped by the brazing material 16 and then flows between the heat transfer tubes 8 and 9 as the brazing material 16 melts. The brazing material can be surely brazed, and the brazing material 17 also melts, but most of it is outside the edge 19 of the notch 14, so the notch
All of the bottom heat transfer tube 8 and fins 10 do not remain in 14
Also, it smoothly flows between the fin collar 11 and the fin collar 11, and brazing is performed well during this time as well, so that the whole is brazed very well and a strong heat exchanger 3 can be formed.

<Effect of Device> In short, the device of the present invention is connected to two different flow paths.
In which one heat transfer tube 8 and 9 are provided, and both heat transfer tubes 8 and 9 are juxtaposed and brazed to a large number of common fins 10 and 10 to form a one-can-two-circuit heat exchanger. , The fin 10
Dharma-shaped insertion hole 12 into which both heat transfer tubes 8 and 9 are inserted
And a plurality of notches 13 connected to the insertion hole 12
・ Providing 14 and two brazing materials 16 in the notches 14 on both sides
・ 17 is inserted and one brazing material 16 has its horizontal center line A
On the extension line of the approaching portion 18 of both heat transfer tubes 8 and 9.
・ The brazing material 17 on the other side is inserted so that the vertical center line B of the brazing material 17 is inserted from the end edge 19 of the cutout portion 14 toward both the heat transfer tubes 8 and 9 side. Brazing with each fin is always performed well, the heat transfer between both heat transfer tubes is smooth, and the heat exchanger itself is not damaged as in the past, and it is strong and can withstand long-term use. To be 1
It is possible to provide a heat exchanger for a two-circuit can water heater.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a one-can two-circuit water heater with an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same heat exchanger, and FIG. 3 is a main part when assembling the same heat exchanger. FIG. 4 is a perspective view showing a state where the main part is inserted in the furnace, (a) shows a state immediately after the insertion in the furnace, and (b) shows a high temperature heating state. 8 ・ 9 …… Heat transfer tube, 10 …… Fin, 12 …… Insertion hole, 13 ・
14 …… Notch part, 16 ・ 17 …… Braze, A …… Horizontal center line,
B ... Vertical center line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kikuo Hara Kikuo Hara 7-7 Higashishinbo, Sanjo City, Niigata Pref. Masayoshi Inamura, Inspector, Uchida Mfg. Co., Ltd. (56) References

Claims (1)

[Scope of utility model registration request] 1. A heat exchanger tube (8, 9) connected to mutually different flow paths, both heat exchanger tubes (8, 9) being juxtaposed and brazed to a large number of common fins (10, 10 ...) One can. In the case of forming a two-circuit type heat exchanger, the fins 10, 10 ... Are provided with daruma-shaped insertion holes 12 into which both heat transfer tubes 8 and 9 are inserted, and are connected to the insertion holes 12. A plurality of notches 13 and 14 are provided, two brazing materials 16 and 17 are inserted in the notches 14 on both sides, and one brazing material 16 has its horizontal center line A at both heat transfer tubes 8 and 9. Is inserted in contact with both heat transfer tubes 8 and 9 on the extension line of the approaching portion 18 of the other, and the brazing material 17 on the other side has its vertical center line B from the end edge 19 of the notch 14 toward both heat transfer tubes 8 and 9. A heat exchanger for a 1-circuit 2-circuit water heater characterized by being inserted.