JPH04108957U - Brazing structure of heat exchanger tube and fins - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a high-quality heat exchanger by supplying just enough brazing material to the fitting parts of the heat exchanger tubes and fins arranged close to each other vertically and to the close parts of the heat exchanger tubes. get. [Configuration] A first hole and a second hole into which the first heat exchanger tube and the second heat exchanger tube are inserted are formed vertically close to each other, and the first and second holes are communicated with each other by a narrow constricted hole. two first notches are formed at the upper end of the first hole symmetrically with respect to the vertical axes of the first and second holes, and the upper end of the second hole and the constricted hole are formed with two first notches. forming a second notch and a third notch that are biased in opposite directions with respect to the upper and lower axes, and inserting the first heat exchanger tube and the second heat exchanger tube into the first hole and the second hole;
Rod-shaped brazing materials are inserted into the first to third notches, and each of the brazing materials is melted to braze the first and second heat exchanger tubes and the fins.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is applicable to heat exchangers used in water heaters, especially those connected to different flow paths. Heat generated by bringing the first heat exchanger tube and the second heat exchanger tube closer vertically and brazing them to a common fin. The present invention relates to an exchanger, and particularly to a brazing structure between heat exchanger tubes and fins.

0002

[Conventional technology]

A conventional technique is described in Japanese Patent Application Laid-open No. 2-247454. That is, as shown in FIG. 3, a circular first hole 2 and a circular second hole 3 are formed in the top and bottom of the fin 1. At the same time, a narrow constricted hole 4 that communicates the first and second holes 2 and 3 is formed. Further, one first notch 5 is provided at the upper end of the first hole 2 above and below the first and second holes 2 and 3. is formed on the axis L, and second notches 6, 6 are formed on both sides of the constricted hole 4, facing the axis L. The lower sides of each of the second notches 6, 6 are formed in a line-symmetric manner, and the lower sides of the second notches 6, 6 are formed with a downward slope. Formed on sides 6a, 6a. Then, a large number of the fins 1 are arranged at a predetermined pitch, and this The first and second heat exchanger tubes 7 and 8 are inserted into the first hole 2 and the second hole 3 so as to be close to each other in the vertical direction. A rod-shaped brazing material 9a is inserted through the first notch 5, and the second notch 6,6 is inserted. Insert two rod-shaped brazing fillers 9b and 9c into each, and place them in a heating furnace (not shown). ) to melt each of the above-mentioned brazing materials 9a to 9c, and this melted brazing material is heated to the above-mentioned 1. Fitting portion between second heat exchanger tubes 7 and 8 and fin 1 and pair of first and second heat exchanger tubes 7 and 8 The above three components are brazed together by flowing the fluid onto the surface.

0003

[Problem that the idea aims to solve]

In the conventional type described above, a piece of brazing material 9a is inserted into the first notch 5 formed on the axis L. When it melts, it passes along the inner periphery of the first hole 2, centering on the axis L. It is not evenly distributed to the left and right, and the left and right gaps between the first hole 2 and the first heat exchanger tube 7 in the upper part ( There was a drawback that the brazing in (a) and (b) was too much or too little. In addition, the second notch on the left and right The two brazing fillers 9b and 9c inserted through the holes 6 and 6, respectively, will melt when they are melted. Most of the liquid flows to the second hole 3 side along the oblique sides 6a, 6a of the second notches 6, 6. , due to insufficient flow into the gap (c) between the upper and lower first and second heat exchanger tubes 7 and 8, both the first and second heat exchanger tubes 2 heat exchanger tubes 7 and 8 are insufficiently brazed together, and the second hole 3 and the lower heat exchanger tube 8 A large amount of brazing material is supplied to the fitting part (d) with the The defect is that it adheres to a wide area on the outer circumferential surface of the heat tube 8, that is, on the outer circumferential surface other than the fitting part with the fin 1. was there. This invention is a new brazing structure between heat transfer tubes and fins that eliminates the above drawbacks. The purpose is to obtain.

0004

[Means to solve the problem]

In order to achieve the above object, the present invention is constructed as follows. That is, The first heat exchanger tube and the second heat exchanger tube are arranged close to each other vertically and penetrated through a common fin to be brazed. In the brazed structure of the heat exchanger tube and the fin, the fin has a circular first A hole and a second hole are formed vertically, and a narrow bracket is formed to communicate the first and second holes. A hole is formed, and two first notches are formed at the upper end of the first hole so that the upper and lower axes of the first and second holes are aligned. the upper end of the second hole and the other of the constricted holes. forming a second notch and a third notch that are biased in opposite directions with respect to the upper and lower axes; A first heat exchanger tube and a second heat exchanger tube are placed close to each other in the vertical direction in the first hole and the second hole. Insert rod-shaped brazing materials into the first, second, and third notches, and melt each brazing material. The first and second heat exchanger tubes and fins are melted and brazed together. .

[0005]

[Effect]

Since the present invention has the above structure, the brazing material inserted into each first notch is melted. When melted, one of the brazing materials flows downward from the top of the first hole toward one half of the hole. , the other brazing material flows downward from the upper part of the first hole toward the other half circumference. Also When the brazing material inserted into the second notch melts, the brazing material is released from one of the upper parts of the second hole. After flowing downward toward one half circumference, the second hole and the second heat transfer inserted through the second hole From the bottom of the second hole toward the other half of the circumference due to capillary action due to the gap between the tube and the tube. It flows upward. Also, when the brazing material inserted into the third notch melts, the brazing material Most of it flows toward the gap between the upper and lower first and second heat exchanger tubes, and some of it flows toward the gap between the first and second heat exchanger tubes. The liquid flows downward from one half of the upper part of the second hole to the other half.

[0006]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, Figure 1 shows the structure of the present invention. FIG. 2 is a cross-sectional front view showing the embodiment, and FIG. 2 is an exploded perspective view thereof. In FIGS. 1 and 2, 10 is a one-can two-circuit heat exchanger used in water heaters, which circulates the water in the bathtub. The first heat exchanger tube 11 is connected to a circulation circuit (not shown) that is connected to The second heat exchanger tube 12 connected to the hot water supply circuit (not shown) is brought close vertically to the hot water supply circuit (not shown). Insert it into a large number of common fins 13 as shown below and braze them together. It becomes.

[0007] That is, a circular first hole 15 and a circular second hole 16 are formed above and below in the fin 13, The first hole 15 and the second hole 16 are communicated through a narrow constricted hole 17. the above The first hole 15 and the second hole 16 are connected to the first heat exchanger tube 11 and the second heat exchanger tube 12 described above. The outer diameter of the first heat exchanger tube 11 and the second heat exchanger tube 12 is slightly larger than that of the first heat exchanger tube 11 and the second heat exchanger tube 12. It has flanges 15a and 16a on its periphery. Upper end of the first hole 15 Two semicircular first notches 18 and 19 are formed in the. These first notches 18,1 9 is formed symmetrically with respect to the vertical axis L of the first and second holes 15 and 16. Ma A semicircular second notch 20 is formed on the left side of the upper end of the second hole 16, and the constriction A third notch 21 is formed on the right side of the hole 17. The third notch 21 is located in the narrow hole 17. Cut out the right side in the vertical direction to form a triangular space on the right side of the constriction hole 17. .

[0008] Then, as shown in FIG. 1, the first heat exchanger tube 11 is inserted into the first hole 15, and The second heat exchanger tube 12 is inserted into the tube 6 to make them approach each other from above and below, and the above-mentioned Round rod-shaped first brazing materials 22, 23 and second brazing materials are provided in the first to second notches 18 to 20. 24 inserted into the third notch 21 and formed into a rod shape having a triangular cross section. 5, and in this state, the whole is placed in a heating furnace (not shown) and heated, and the first - Melt the third brazing filler metals 22 to 25 and solder the fins 10 and the heat exchanger tubes 11 and 12. Attach.

[0009] According to the above embodiment, the first brazing materials 22, 2 inserted into the respective first notches 18, 19 3 is melted, each of the first brazing materials 22 and 23 is biased to the left and right with respect to the axis L. Therefore, most of the first brazing material 22 on the left extends from the top of the first hole 15 to the half circumference on the left. Most of the first brazing material 23 on the right is above the first hole 15. The melted brazing material flows down toward the right half circumference, and as a result, the melted brazing material flows into the first heat exchanger tube 1. 1 and the first hole 15 are uniformly filled, and the first heat exchanger tube 11 is locked into the fin 10. This will result in you being penalized. Also, the second brazing material 20 inserted into the second notch 20 is melted. When melted, the second brazing material 20 moves from the upper left part of the second hole 16 toward the left half-circumference. After flowing down, the gap between the second hole 16 and the second heat exchanger tube 12 inserted into the second hole 16 upwardly from the bottom of the second hole 16 toward the right half circumference due to capillary action. most of the second heat exchanger tube 12 is attached to the fins 10 by the second brazing material 20. Be soldered. Further, when the third brazing material 25 inserted into the third notch 21 melts, Since the third brazing material 21 is located on the right side of the constriction hole 17, most of it is located in the first, It flows toward the gap between the second heat transfer tubes 11 and 12, that is, toward the constricted hole 17, and the first heat transfer While brazing the lower end of the heat tube 11 and the upper end of the second heat exchanger tube 12, flows down from the left part of the upper part of the second hole 16 toward the right half circumference, and thereby , the second heat exchanger tube 12 and the second The upper right portion of the fitting portion with the hole 16 will be brazed.

0010

[Effect of the idea]

As is clear from the above explanation, according to the present invention, the fitting portion between the fin and each heat transfer tube Also, it is possible to supply just the right amount of brazing metal to the parts where each heat exchanger tube is close to each other, resulting in high quality This has the effect of making it possible to obtain a heat exchanger.

[Brief explanation of drawings]

FIG. 1 is a sectional front view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG. 1;

FIG. 3 is a cross-sectional front view showing a conventional example.

[Explanation of symbols]

10 Heat exchanger 11 First heat exchanger tube 12 Second heat exchanger tube 13 Fin 15 First hole 15a flange 16 2nd hole 16a flange 17 Constriction hole 18 First notch 19 First notch 20 Second notch 21 Third notch 22 First brazing material 23 First brazing material 24 Second brazing material 25 Third brazing material L axis

Claims (1)

[Scope of utility model registration request] 1. A brazed structure of heat exchanger tubes and fins, in which a first heat exchanger tube and a second heat exchanger tube are arranged vertically close to each other and are brazed through a common fin, wherein the fin has a circular shape. A first hole and a second hole are formed vertically, a narrow constricted hole is formed to communicate the first and second holes, and two first notches are formed at the upper end of the first hole. , a second notch formed line-symmetrically with respect to the vertical axis of the second hole, and biased in a direction opposite to the vertical axis at one of the upper ends of the second hole and the other of the constricted hole; and a third notch, and insert a first heat exchanger tube and a second heat exchanger tube into the first hole and the second hole while vertically approaching each other, and A structure for brazing heat exchanger tubes and fins, characterized in that rod-shaped brazing materials are inserted into the notches and each of the brazing materials is melted to braze the first and second heat exchanger tubes and the fins.