JPS623645Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a heating can for use in baths, etc.

[Conventional technology and problems]

Generally, long fins are fixed to the inner or outer surface of the top wall of the combustion chamber of the housing at appropriate intervals along the longitudinal direction of the combustion chamber to increase the efficiency of heat exchange, reduce the size of the housing, and A system designed to save fuel has already been proposed and put into practical use, as seen in Japanese Utility Model Publication No. 19059/1973. However, this type of fin has the following problems because both ends of each fin are aligned.

In other words, each fin is heated, and due to the temperature difference between the heat input side edge and the corresponding heat radiation side edge,
As shown in Figure 1, stress occurs that causes the linear fin to curve into an arc, and this stress is concentrated at both ends of the fin, and this stress concentration area a is mutually connected to the stress concentration area a of the adjacent fin. Due to the overlapping of each other, a large stress was applied to a certain area located at the end of a large number of parallel fins, causing cracks in the top wall and causing water leakage. Therefore, it is possible to prevent this type of crack from occurring by making the ceiling wall in the area where stress is concentrated thicker than other parts, but this is disadvantageous economically and in terms of heat exchange performance. Moreover, since the process of welding steel plates of different thicknesses is increased, there is an unavoidable disadvantage that the cost will further increase.

[Purpose of the invention]

The present invention was developed in view of the above circumstances, and has a simple structure. Specifically, by separating both ends of each adjacent fin, the present invention eliminates the duplication of stress occurring at the end of each fin, and It is an object of the present invention to provide a heating can which can rationally prevent cracks from occurring in the heat exchanger and which has good reliability and heat exchange performance.

[Structure of the idea]

The structure of the present invention that solves the problems of the conventional technology is as follows:
On the inner surface of the combustion chamber ceiling wall of the housing, or on the inner and outer surfaces of the ceiling wall,
In a case in which a large number of fins are arranged and fixed in parallel at appropriate intervals along the longitudinal direction of the combustion chamber, both ends of each of the adjacent fins are separated, and the ends of each adjacent fin are connected to each other. It is characterized in that it is located outside the stress concentration areas acting on the ends so that the stress concentration areas occurring at each end do not overlap with other stress concentration areas.

〔Example〕

Next, the details of the embodiment will be described with reference to FIGS. 2 to 4. Reference numeral 1 denotes a case, and a combustion chamber 2 formed in the lower front part of the case, and a top wall 3 of the flame passage on the inner surface thereof. A large number of long fins are parallel to the direction of flame propagation and have a height that is approximately equal to or greater than the thickness of the moist insulating gas layer that significantly inhibits heat exchange on the inner surface of the ceiling wall 3. 4 are arranged in parallel at appropriate intervals. Furthermore, a large number of long fins 5 are provided at appropriate intervals on the outer surface of the ceiling wall corresponding to the inner surface of the ceiling wall 3 provided with the long fins 4. In the figure, 6 is a heat ventilation pipe.

According to the present invention, in the case configured as described above, as shown in FIG. 5a is located outside the stress concentration area a acting on the end, and each end 4
The stress concentration areas a and 5a are arranged so that they do not overlap with the ranges of other adjacent stress concentration areas.

〔effect〕

Since the present invention is configured as described above, the following effects can be obtained.

(a) The presence of the long fins not only increases heat exchange efficiency and saves fuel, but also allows for a smaller housing; (b) Particularly in the present invention, Since both ends of each adjacent fin are separated and the end of each adjacent fin is located outside the stress concentration area acting on the end, each fin deforms into an arc shape as shown in Figure 1. Even if the stress generated due to the fins acts as a concentrated stress on each fin end, this stress concentrated portion can be treated as an independent one, and the stress concentrated portions of adjacent fins do not overlap and interfere with each other. Therefore, ceiling wall damage accidents can be completely prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the deformation of the fins, FIG. 2 is a front view of the case, FIG. 3 is a side view of the same, and FIG. 4 is a plan view of the main part showing an example of the arrangement of the fins. 1... Housing, 2... Combustion chamber, 3... Top wall, 4,
5... Long fin, 4a, 5a... End portion, a...
Stress concentration area.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) A case in which a large number of fins are arranged and fixed in parallel along the longitudinal direction of the combustion chamber at appropriate intervals on the inner surface or inner and outer surfaces of the top wall of the combustion chamber of the case. (b) separating both ends of each of the adjacent fins;
A heating container characterized in that each adjacent fin end portion is located outside a stress concentration portion acting on the end portion, so that the stress concentration portion occurring at each end portion does not overlap with other stress concentration portions. .