JPH0519857U - Heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the temperature of the skirt of the heat exchanger and improve the durability of the skirt. [Structure] The lower ends of the fins 3 are bent in an "L" shape to form guides 7, which prevent the combustion exhaust flowing along the inner surface of the skirt 2 from passing upward and send the combustion exhaust to the center side. . As a result, the temperature rise of the skirt 2 is suppressed, and the durability of the skirt 2 against the expansion of the fins 3 is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger used for gas combustion equipment such as a water heater.

[0002]

[Prior Art]

 Conventionally, this type of heat exchanger is called a fin-and-tube heat exchanger, and as shown in FIG. 4, a plurality of fins F made of a plate-shaped copper plate are arranged in parallel vertically at predetermined intervals, The plurality of fins F (hereinafter, referred to as a fin group FG) are configured to penetrate the heat transfer tube P. The fin group FG is brazed on the outer periphery of a frame S (generally called a skirt) having a rectangular tubular shape and supported by the frame S from a burner (not shown). The combustion exhaust of is guided. Therefore, the combustion exhaust gas from the burner flows through the frame S and flows between the fins F, and the heat of the combustion exhaust gas is transferred from each fin F to the water flowing through the heat transfer pipes P to obtain hot water. it can.

[0003]

[Problems to be solved by the device]

 However, in such a conventional heat exchanger, there has been a problem that the frame S (hereinafter referred to as a skirt) has a high temperature due to passage of combustion exhaust gas and lacks durability. That is, the skirt S is urged to open laterally due to the expansion of the fins F due to the heating of the combustion exhaust gas, while the lower part not fixed to the fins F is laterally moved by a heat transfer tube (not shown) wound around it. Since the deformation is restricted, the bending deformation is repeated at the portion A and a crack is generated. In particular, this tendency becomes more remarkable as the skirt S is heated to a higher temperature by combustion exhaust.

It is an object of the present invention to solve the above problems and to reduce the temperature of the skirt and improve the durability of the skirt.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the heat exchanger of the present invention has a plurality of fins arranged vertically in parallel at a predetermined interval, and a group of fins through which combustion exhaust flows, and a fin group inserted inside the fin group at substantially right angles. In a heat exchanger having a heat transfer tube through which a fluid flows and a frame body that surrounds the fin group and guides the combustion exhaust gas to the fin group, the combustion exhaust gas flowing along the inner side surface of the frame body upwards. The gist is that guides that prevent passage are formed at both ends of the fin.

Further, the guide may be formed by folding back the fin end portion, or may be formed by burring.

[0007]

[Action]

 In the heat exchanger of the present invention having the above structure, the combustion exhaust gas flows upward in the frame body and is guided to the fin group, but the combustion exhaust gas flowing along the inner side surface of the frame body is formed at both ends of the fin body. The guide blocks the upward passage, and as a result, the temperature rise of the frame is suppressed and the durability of the frame is improved.

[0008]

【Example】

 In order to further clarify the structure and operation of the present invention described above, a preferred embodiment of the heat exchanger of the present invention will be described below.

FIG. 1 is a perspective view (a front side is partially broken) showing an outline of a heat exchanger as a first embodiment. In the heat exchanger 1, plate-like fins 3 are vertically aligned in parallel at a predetermined interval on a rectangular tube-shaped frame body 2 (hereinafter referred to as a skirt) and fixed by brazing. The heat transfer tube 5 is inserted into the heat transfer tube 5 (hereinafter referred to as the fin group 4) and fixed by brazing. A burner (not shown) is arranged below the skirt 2, and hot combustion exhaust gas from the burner is sent to the fin group 4 through the skirt 2. The cold water passed through the heat transfer pipe 5 is transferred to the hot water supply pipe (not shown) by the heat of the combustion exhaust being transferred through the fins 3 to become hot water.

At both ends of each fin 3, a brazed portion 6 is formed by bending the fin 3 in an L-shaped cross section. Further, on both ends of the lower portion of the fin 3 on the extension of the brazing portion 6, guides 7 are formed by bending the surface of the fin 3 into an "L" shape and extending obliquely downward.

Here, the function of the guide 7 will be described with reference to FIG. The combustion exhaust gas from the burner is sent upward through the skirt 2, but the combustion exhaust gas flowing along the inner surface of the skirt 2 is prevented from passing upward by the guide 7 as shown by the arrow in the figure. It is sent to the central side. As a result, the combustion exhaust gas does not flow on the surface of the skirt 2 to which the fins 3 are fixed and the upstream side surface to some extent, so that the temperature rise of the skirt 2 is suppressed.

As a result, the durability of the skirt 2 is improved. That is, cracks are less likely to occur when the fins 3 expand. Further, the guide 7 can be easily formed by bending both end surfaces of the fin 3, and the structure does not become complicated.

Next, a heat exchanger according to a second embodiment of the present invention will be described with reference to FIG. The heat exchanger 10 of the second embodiment uses a fin 12 in which a guide 11 is formed by burring instead of the fin 3 of the first embodiment, and the other configurations are the same. In FIG. 3, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Cylindrical guides 11 are formed by burring near both ends of the brazing portion 13 at both lower ends of each fin 12 provided in the skirt 2. Then, as shown by the arrow in the figure, the combustion exhaust flowing on the inner surface of the skirt 2 is guided to the center side by the guide 11. That is, similar to the first embodiment, the temperature of the surface of the skirt 2 to which the fins 12 are fixed and the upstream side surface of the surface are suppressed to some extent. As a result, the durability of the skirt 2 can be improved with a simple structure.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be implemented in various modes without departing from the scope of the present invention. .

[0016]

[Effect of the device]

 As described above in detail, in the heat exchanger of the present invention, since the guides that prevent the combustion exhaust gas from passing upward are formed at both ends of the fin, the temperature rise of the frame body (skirt) is suppressed, and the durability of the frame body is reduced. It has an excellent effect that the property can be improved. In addition, it can be carried out very easily by folding the ends of the fins or forming guides by burring.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a heat exchanger according to a first embodiment.

FIG. 2 is a sectional view of the heat exchanger of the first embodiment.

FIG. 3 is a sectional view of a heat exchanger according to a second embodiment.

FIG. 4 is a schematic perspective view of a conventional heat exchanger.

[Explanation of symbols]

1 ... Heat exchanger, 2 ... Frame body (skirt), 3 ... Fins, 4
... Fin group, 5 ... Heat transfer tube, 7 ... Guide, 10 ... Heat exchanger, 11 ... Guide, 12 ... Fin

Claims (3)

[Scope of utility model registration request] 1. A fin group in which a plurality of fins are arranged vertically in parallel at a predetermined interval, and combustion exhaust flows between them, a heat transfer tube which is inserted into the fin group at a substantially right angle and through which a fluid flows, and the fins. In a heat exchanger having a frame body that surrounds the periphery of the group and guides the combustion exhaust gas to the fin group, guides that prevent passage of combustion exhaust gas flowing along the inner surface of the frame body upward are provided at both ends of the fins. A heat exchanger characterized by being formed in the section. 2. The heat exchanger according to claim 1, wherein the guide is formed by folding back fin end portions. 3. The heat exchanger according to claim 1, wherein the guide is formed by burring.