JPS624833Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an improvement of a combustion device for a water heater.

(b) Background Art Conventionally, as shown in FIG. 1, in a hot water storage type water heater, a hot water storage tank 2 and a combustion device 3 are housed in a vertical relationship in an outer box 1. The combustion device 3 has a heat exchanger 6 and a burner 7 disposed in a vertical relationship in a space surrounded by a combustion tube 4 and an exhaust hood 5 that covers the upper side of the combustion tube 4. The heat exchanger 6 heats the water supplied from the bottom of the hot water storage tank 2 via the water outgoing pipe 8 using the combustion gas of the burner 7, and the hot water heated in the heat exchanger 6 is passed through the hot water return pipe 9. The hot water is returned to the upper part of the hot water storage tank 2 through the In addition, the exhaust gas that has passed through the heat exchanger 6 is collected in the exhaust hood 5, and is collected in the exhaust fan 11 attached to the exhaust port 10.
is discharged through the flue 12.

By the way, the exhaust hood 5 and the combustion tube 4 are
As shown in the figure, semicircular notches 1 that fit into the heat transfer tubes 15 inside the pair of headers 13 and 14 of the heat exchanger 6 are provided at the lower and upper peripheral edges, respectively.
6, 17 and 18, 19, and flange pieces 20, 21 and 22, 23 that are joined to each other are provided, and both ends of the heat exchanger tubes 15 are sandwiched in a sandwich shape with a sealing material (not shown) interposed therebetween. At the same time, the flange pieces are joined to each other with a sealing material (not shown) interposed therebetween, so that the flange pieces are sealed together.

For this reason, the shapes of the exhaust hood 5 and the combustion tube 4 are complicated, which results in poor workability, and the attachment of sealing material is troublesome, resulting in poor workability during assembly.Furthermore, it is difficult to inspect and replace the heat exchanger. The disadvantage was that the workability during disassembly was poor.

(c) Purpose of the invention The present invention was made in view of the above-mentioned shortcomings of the conventional technology, and aims to simplify the shape of the exhaust hood and combustion tube while maintaining the sealing properties of the joints, making it easier to use during assembly and service. The purpose is to improve workability.

(d) Main points of the invention This invention is a heat exchanger consisting of a pair of headers and a plurality of heat transfer tubes communicating between these headers, in a space surrounded by a combustion cylinder and an exhaust hood that covers the upper part of the combustion cylinder. and a burner are disposed in a vertical relationship, and two sets of flanges are provided on the lower periphery of the exhaust hood, with two opposing sides facing each other, and two sets of flanges are provided at different heights from each other. Two sets of flanges are provided, one set of two sides are provided, and a pair of headers of the heat exchanger are sandwiched between one set of flanges on the high side of the exhaust hood and one set of flanges of the combustion tube. The feature is that one set of flanges on the low stage side and the other set of flanges of the combustion tube are joined to each other. Focusing on the flat upper and lower edges of the pair of headers, these parts are attached to the exhaust hood. A set of flanges on the high stage side and a set of flanges on the combustion tube are sandwiched together, and a set of flanges on the low stage side of the exhaust hood and the remaining set of flanges on the combustion tube are joined to each other. This makes it possible to simplify the shapes of the exhaust hood and combustion tube while maintaining the airtightness of the joints, making it easier to connect during assembly and disassemble during service.

(E) Example of the invention An example of the invention shown in the drawings will be described below. FIG. 3 shows a storage type water heater to which the present invention is applied, and the same parts as shown in FIG. 1 are given the same reference numerals. The one shown in FIG. 3 differs from the one shown in FIG. 1 in the shape and connection method of the exhaust hood 25 and combustion tube 26 of the combustion device 24.

That is, as shown in FIG.
A pair of flanges 27 and 28 on the higher side, which have two opposite sides and connect to the upper edges of the headers 13 and 14, are provided on the lower peripheral edge of the header, and a pair of flanges 27 and 28 on the lower side that are at a different level from these. flanges 29 and 30 are provided, and a pair of flanges 31 and 32 are provided on the upper peripheral edge of the combustion tube 26 and have two opposing sides, and are joined to the lower edges of the headers 13 and 14;
A remaining set of flanges 33 and 34 are provided. The exhaust hood 25 and the combustion tube 26 have headers 13 and 14 connected to flanges 27 and 14, respectively.
31 and the flanges 28 and 32, sandwiching the flange 2 in a sandwich shape with a sealing material interposed therebetween.
9 and 33 and flanges 30 and 34 are connected in a sealed state by joining them with screws or the like with a sealing material interposed therebetween.

According to this embodiment, the header 13,
14, a set of flanges 27 on the high side of the exhaust hood 25 using the flat upper and lower edges.
28, and a set of flanges 31, 3 of the combustion tube 26.
2 and the exhaust hood 25.
The set of flanges 29, 30 on the lower stage side of the combustion tube 26 and the remaining set of flanges 33, 34 of the combustion tube 26 are joined to each other. It is possible to maintain good sealing properties at these joints while shaping the product, improving workability, and making it possible to apply sealants quickly, making it easy to connect during assembly and disassemble during service. become. Further, in the heat exchanger 6, the combustion gas contacts not only the heat exchanger tubes 15, but also the headers 13 and 14 to perform heat exchange, and the heat exchanger 6 can have fins attached to the entire heat exchanger tube, thereby improving thermal efficiency.

(f) Effects of the invention As explained above, this invention can simplify the shapes of the joints of the exhaust hood and combustion tube while maintaining good sealing, improving workability and making assembly easier. It simplifies the assembly work during service and the disassembly work during service, can be constructed at low cost, and has excellent practical effects such as increasing the heat transfer area of the heat exchanger and improving thermal efficiency.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing an example of a water heater incorporating a conventional combustion device, Fig. 2 is an exploded perspective view of essential parts of the combustion device shown in Fig. 1, and Fig. 3 is a combustion device to which the present invention is applied. FIG. 4 is a schematic cross-sectional view showing an example of a water heater incorporating the combustor, and FIG. 4 is an exploded perspective view of essential parts of the combustion device shown in FIG. 3. 6... Heat exchanger, 7... Burner, 13, 14...
... Header, 15 ... Heat exchanger tube, 24 ... Combustion device, 25 ... Exhaust hood, 26 ... Combustion cylinder, 27
~34...Flange.

Claims (1)

[Scope of utility model registration request] A heat exchanger consisting of a pair of headers, a plurality of heat transfer tubes communicating between the headers, and a burner are arranged in a vertical relationship in a space surrounded by a combustion cylinder and an exhaust hood that covers the upper part of the combustion cylinder. In this case, two sets of flanges are provided, with the two sides facing each other facing the lower periphery of the exhaust hood as one set, and the two sets of flanges having different heights from each other. One set of flanges on the high stage side of the exhaust hood and one set of flanges on the combustion tube sandwich the pair of headers of the heat exchanger, and one set of flanges on the low stage side of the exhaust hood are sandwiched between the pair of flanges on the high stage side of the exhaust hood and one set of flanges on the combustion tube. A combustion device for a water heater, characterized in that a flange and a remaining set of flanges of a combustion tube are joined to each other.