JP3203932B2 - Heat exchanger can - 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 exchanger can.

[0002]

2. Description of the Related Art In a two-circuit hot water supply heat exchanger, for example, two heat exchange water pipes provided for two circuits are paired up and down and penetrated a plurality of times through the can body of the heat exchanger. Let it. Along with this, it is necessary to provide a plurality of insertion holes for penetrating a pair of upper and lower water pipes in the side wall of the can body of the heat exchanger. In the case of such a heat exchanger can, when the water pipe for heat exchange is brazed to the insertion hole in the side wall of the can, etc., it takes much time and labor to braze by hand brazing. Further, there is a disadvantage that it is difficult to securely braze the heat exchange water pipe to the entire circumference of the insertion hole by hand brazing.
There is also a method in which the can body and a plurality of water exchange pipes for heat exchange penetrating the can body are simultaneously brazed in a furnace. FIG. 4 is a cross-sectional view illustrating an example of the conventional furnace brazing. The prior art will be described with reference to this figure. Two pairs of water exchange pipes 1 and 2 for heat exchange are inserted into a pair of opposed body plate side walls 11 of the can body so as to be inserted vertically into contact with each other. A large number of Dharma-type insertion holes 20 are formed in which the lower portion and the upper portion of the lower insertion hole 22 communicate with each other. The water pipe 1 of, for example, a bath water heating circuit is inserted through the insertion hole 21 above the Dharma-type insertion hole 20, and the water pipe 2 of the hot water supply circuit is inserted through the lower insertion hole 22. The brazing between the pair of water pipes 1 and 2 and the body plate side wall 11 is performed by inserting a brazing material 41 near the top of the periphery of the insertion hole 21 above the Dharma-type insertion hole 20 in a form lacking a part of the burring edge 41. A hole 31 is provided,
The brazing material 3 is inserted into the brazing material insertion hole 31 and is placed in a furnace so that the water pipes 1 and 2 are in a horizontal state, and heated. As a result, the brazing material 3 melts, flows downward through the inner periphery of the upper insertion hole 21, flows downward through the inner constriction, and further flows downward through the inner periphery of the lower insertion hole 22, and the burring edge 41 of the upper insertion hole 21. Brazing the shell side wall 11 and the water pipe 1 on the inner circumference of
Brazing to the upper and lower water pipes 1 and 2 is performed at the central constricted portion, and brazing between the shell side wall 11 and the water pipe 2 at the inner periphery of the burring edge 42 of the lower insertion hole 22 is performed. Instead of providing the brazing material insertion hole 31, a ring-shaped brazing material may be attached to the upper water pipe 1 and brazed in the furnace.

[0003]

However, in the above-mentioned conventional furnace brazing, the brazing melted in the upper brazing material insertion hole 31 during the brazing is carried out by the burring edge 41 of the upper insertion hole 21.
Flows down along the inner periphery of the hole, but the space 23 at the central constriction of the Dharma-type insertion hole 20 is large, and therefore the molten brazing material that has descended the inner periphery of the upper insertion hole 21 is located in the space 23. The two water pipes 1, 2 at the central constriction
There was a drawback that the wax did not turn sufficiently during. There is also a problem that the wax does not flow between the inner periphery of the burring edge 42 of the lower insertion hole 22 and the lower water pipe 2. For this reason, it was also difficult to securely braze the heat exchange water pipes 1 and 2 to the entire periphery of the insertion holes 21 and 22. In addition, even when the ring-shaped brazing is mounted, when the mounting is performed only on the upper water pipe 1, the brazing of the lower water pipe 2 tends to be insufficient. Further, when the ring-shaped brazing material is also mounted on the lower water pipe 2, there is a disadvantage that the labor is doubled.

Therefore, the present invention solves the above-mentioned disadvantages of the prior art, and in a one-can, two-circuit hot water supply heat exchanger, a plurality of pairs of heat exchange water pipes that penetrate can be reliably and easily reduced over the entire circumference at low cost. It is an object of the present invention to provide a heat exchanger can body that can be brazed in a furnace.

[0005]

In order to achieve the above object, a heat exchanger can of the present invention has a shape in which a pair of upper and lower insertion holes are communicated on the way to penetrate a heat exchange water pipe. A plurality of darma-shaped insertion holes, a plurality of burring formed in the upper and lower insertion holes of the Dharma-type insertion hole, wherein a plurality of daruma-shaped insertion holes are provided on a pair of opposed body plate side walls of the can body. The edges are penetrated deeply until they are close to the horizontal direction at the central constriction of the Dharma-type insertion hole, and a pair of lower ends of the upper burring edge and a pair of upper ends of the lower burring edge are vertically aligned. The upper end of the pair of lower burring edges has a slightly larger opening than the lower end of the pair of lower burring edges of the upper burring edge. .

[0006]

A plurality of pairs of water exchange pipes for heat exchange of one can and two circuits are inserted through a pair of daruma type insertion holes provided on the side wall of the body plate of the can body, and a brazing material is attached. Then, when heated in a furnace, the wax flowing down between the inner periphery of the burring edge of the upper insertion hole and the water pipe is constricted at the center of the Dharma-type insertion hole along the inner surface of the upper burring edge. And penetrates deeply into the space, and accumulates in a small gap formed between a pair of lower end tips of the upper burring edge and upper and lower water pipes in contact with the lower end tip. As a result, the upper water pipe and the side wall of the can body are brazed at the inner periphery of the burring edge of the upper insertion hole, and the upper and lower water pipes are also brazed. At this time, the degree of opening of the pair of upper ends of the lower burring edge is slightly larger than the degree of opening of the pair of lower ends of the upper burring edge, and the pair of lower ends of the upper burring edge. And a pair of upper ends of the lower burring edge are close enough to touch each other in the vertical direction, so that a small space in the central constriction is ensured without the wax flowing out of the central constriction to the outside of the burring edge. Meet. Then, in the small gap in the central constriction, the wax eventually becomes excessive, and the excess wax flows down between the lower water pipe and the burring edge of the lower insertion hole without flowing out of the burring edge. , Brazing between them. As described above, in the configuration of the present invention, the burring edges formed in the upper and lower insertion holes are deeply penetrated into the central constriction portion of the Dharma-type insertion hole so as to approach the horizontal direction, and The burring is configured such that the pair of lower ends and the pair of upper ends of the lower burring edge contact each other in the vertical direction, and the burring is lower than the opening of the pair of lower ends of the upper burring edge. By slightly increasing the degree of opening of the pair of upper ends of the edges, a plurality of pairs of penetrating heat exchange water pipes can be securely brazed all over the circumference, easily, and at low cost in a furnace at once. be able to.

[0007]

1 is a view showing a can body of a heat exchanger according to an embodiment of the present invention, in which (A) is a front view and (B) is a right side view.
FIG. 2 is a diagram illustrating a part of the left side surface of the heat exchanger. FIG. 3 is a view showing the details of a Dharma-type insertion hole provided in the can body plate.

In FIGS. 1 and 2, the can 10 of the heat exchanger is formed, for example, as a copper can and can be used as a two-circuit hot water supply heat exchanger. A plurality of Dharma-type insertion holes 50 are provided at regular intervals in the upper part of a pair of body plate side walls 11 facing the left and right sides of the can body. In the embodiment, the staggered arrangement is provided in two stages. The heat exchange water pipes of each of the two circuits constituting the two circuits are penetrated through each of the Dharma-type insertion holes 50 and are brazed. The water exchange pipe for heat exchange in each circuit is a finned pipe for performing heat exchange in the can body 10. 12 is a hole for inserting a burner.

Referring also to FIG. 3, a pair of body plate side walls of the can body 10 is provided.
The lower part of the upper insertion hole 51 and the lower insertion hole 52 so that the pair of upper and lower heat exchange water pipes
A plurality of Dharma-type insertion holes 50 are provided, which communicate with each other in a state where the upper portions thereof relatively overlap with each other. The upper hole 51 of the Dharma-type insertion hole 50 is inserted with a water pipe 1 of a bath water heating circuit, for example, and the lower insertion hole 52 is inserted with a water pipe 2 of a hot water supply circuit. The upper and lower burring edges 72 and 72 are provided in the upper and lower insertion holes 51 and 52, respectively.
Is provided. At the uppermost part of the upper insertion hole 51, there is provided a brazing material insertion hole 61 through which the bar-shaped or linear brazing material 3 is inserted so as to be in contact with the outer side of the upper burring edge 71. When the ring-shaped brazing material is directly mounted on the water pipe 1 and brazed, the brazing material insertion hole 61 may not be provided.

The upper burring edge 71 is formed so as to penetrate deeply into the central constriction 53 of the Dharma-type insertion hole 50. That is, referring to FIG. 3, a pair of lower end portions 71b, 71b of the upper burring edge 71 are configured to be deeply penetrated into the central constricted portion 53 until they are close to each other in the horizontal direction. Accordingly, not only the upper water pipe 1 but also the lower water pipe 2 comes into contact with the lower end portions 71b, 71b of the upper burring edge 71. The lower burring edge 72 also penetrates the pair of upper end portions 72b, 72b until the pair of upper end portions 72b, 72b approaches the central constriction portion 53 of the Dharma-type insertion hole 50 in the horizontal direction, so that the upper end portions 72b, 72b, 72b is in contact with or close enough to contact the lower end portions 71b, 71b of the upper burring edge 71. The degree of opening of the pair of upper end portions 72b, 72b of the lower burring edge 72, that is, the degree of opening, is equal to the pair of lower end portions 71 of the upper burring edge 71.
The opening degree is slightly larger than the opening degrees of b and 71b.

By forming the upper and lower burring edges 71 and 72 as described above, the upper burring edge 71 and the upper and lower water pipes 1 and 2 form the upper and lower burring edges 71 and 72 at the central constriction 53 of the Dharma-type insertion hole 50. a pair of small first gap S ₁ is formed between. In the central constriction 53, the lower burring edge
In the 72 and burring edges 71 and the water pipe 2 below the top, a pair of small second gap S ₂ is formed between them. Of course,
The first gap S ₁ and the second gap S ₂ may be connected to one gap depending on the dimensions of the water pipes ₁ and 2, but in any case, the first gap S ₁ and the second gap S ₂ are formed at the central constriction 53 of the Dharma-type insertion hole 50. The gap will be small. Further, since the upper end portions 72b, 72b of the lower burring edge 72 are in contact with or close enough to contact the lower end portions 71b, 71b of the upper burring edge 71, the molten wax passes through the gap of the central constricted portion 53. It does not leak out beyond the burring edges 71, 72.

A pair of upper and lower heat exchange water pipes 1 and 2 each having a heat exchange fin and a one-can two-circuit type are connected to a pair of left and right body plate side walls 11 and 11 of a can body 10 by a Dharma type. The brazing material 3 is inserted through the pair of upper and lower insertion holes 51 and 52 of the insertion hole 50, and the brazing material 3 is inserted into the brazing material insertion hole 61 of the upper insertion hole 51, and placed in a furnace. Then, the brazing material 3 melts,
It flows between the inner circumference of the burring edge 71 of the upper insertion hole 51 and the upper water passage pipe 1 and penetrates deeply into the central constriction 53 of the Dharma-type insertion hole 50 along the inner surface of the upper burring edge 71, A pair of lower end portions 71b of the upper burring edge 71 and a lower end portion thereof
Is filled into a small first gap S ₁ formed between the upper and lower water pipe 1, 2 in contact with 71b. Thereby, the upper water passage pipe 1 and the shell plate side wall 11 are brazed on the inner periphery of the burring edge 71 of the upper insertion hole 51, and a pair of lower end portions 71b, 71b of the upper burring edge 71 are formed. by small first row in the gap S ₁ composed of the upper and lower water pipe 1 is filled, brazing of the upper and lower water pipe between 1 and 2 be reliably. Further melt wax said smaller first from the gap S _1, a pair of upper tip 72b of the lower burring edges 72
, 72b and a burring edges 71 of the upper flow into a small gap S ₂ second formed between the water pipe 2 below, leakage from the second gap S ₂ out of the burring edges 71 and 72 It flows between the inner periphery of the burring edge 72 of the lower insertion hole 52 and the lower water pipe 2 without performing. This allows the lower insertion hole 52
The lower water pipe 2 and the shell plate side wall 11 are brazed on the inner periphery of the burring edge 72. The same applies to a case where a ring-shaped brazing material is mounted on the upper water pipe 1 and brazed in the furnace without providing the brazing material insertion hole 61.

[0013]

According to the present invention, the burring edges formed in the upper and lower insertion holes of the Dharma-type insertion hole are respectively formed by the can body of the heat exchanger according to the first aspect of the present invention. By being formed so as to be deeply penetrated in the central constricted portion of the Dharma-type insertion hole so as to be close to the horizontal direction, the gap generated in the central constriction of the Dharma-type insertion hole can be reduced, and therefore, The wax flowing down from the insertion hole can be flowed down in a sufficient amount to the lower insertion hole side without being exhausted in the gap of the constricted portion, and brazing is performed on the entire circumference of the Dharma type insertion hole. Can be. In addition, the entire circumference can be brazed only by mounting the brazing material only on the upper insertion hole side. Also, since the degree of opening of the pair of upper ends of the lower burring edge is slightly larger than the degree of opening of the lower ends of the pair of upper burring edges, the molten wax flowing down the inner periphery of the upper burring edge is removed. In addition, it is possible to penetrate deep into the central constriction of the Dharma-type insertion hole without leaking out of the burring edge from the pair of opened lower end tips. Furthermore, since the pair of upper end portions of the lower burring edge and the pair of lower end portions of the upper burring edge are configured to contact each other in the vertical direction,
The molten wax from the gap in the central constriction of the darma-type insertion hole does not leak out of the burring edge beyond the pair of upper end tips of the lower burring edge, and the inner periphery and the lower passage of the lower burring edge do not leak. The water can flow down to the pipe with the water pipe 2, and the brazing of both can be performed reliably. Therefore, according to the can of the heat exchanger of the present invention as described above, the penetrating heat exchange water pipe can be securely brazed all over the circumference, easily, and at a low cost at once.

[Brief description of the drawings]

FIG. 1 is a view showing a can body of a heat exchanger showing an embodiment of the present invention.

FIG. 2 is a diagram showing a part of a left side surface of the heat exchanger.

FIG. 3 is a view showing details of a Dharma-type insertion hole provided in a can body plate.

FIG. 4 is a cross-sectional view illustrating an example of conventional in-furnace brazing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water pipe 2 Water pipe 10 Can body 11 Body plate side wall 50 Dharma type insertion hole 51 Upper insertion hole 52 Lower insertion hole 53 Central constriction 71 Upper burring edge 71b Lower end tip 72 Lower burring edge 72b Upper end tip

Continued on the front page (72) Inventor Hidenori Hata 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Noritsu Co., Ltd. (56) References JP-A-6-313623 (JP, A) JP-A-3-13066 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28F 9/00-9/26 F24H 9/00

Claims (1)

(57) [Claims] In order to penetrate a water exchange pipe for heat exchange, a plurality of dalma-type insertion holes in which a pair of upper and lower insertion holes are communicated on the way are provided on a pair of opposed body plate side walls of a can body. The can body of the heat exchanger according to the above, wherein the burring edges formed in the upper and lower insertion holes of the Dharma-type insertion hole, respectively, penetrate deeply until they are close to the horizontal direction at the central constriction of the Dharma-type insertion hole. A pair of lower ends of the upper burring edge and a pair of upper ends of the lower burring edge contact each other in the vertical direction, and a pair of lower ends of the upper burring edge. A can body for a heat exchanger, wherein the degree of opening of the pair of upper ends of the burring edges below the degree of opening is slightly larger.