JPS6023643Y2 - Forced air combustion device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connection structure between a burner case and a heat exchanger in a forced air combustion device.

In this type of combustion apparatus, combustion air is forced into the combustion chamber by a blower fan, so if the seal between the burner case and the heat exchanger is incomplete, high-temperature combustion gas will leak.

It is also necessary to prevent condensed water (drainage) generated on the inner surface of the heat exchanger shell from flowing down the inner surface of the shell to the burner case.

From this point of view, conventionally, as shown in FIG. 1, the lower end inner surface of the body plate 2 of the heat exchanger provided with the upper fin pipe 1 is bent diagonally with the upper end facing into the combustion chamber 3, and the lower end is bent. A frame plate 4 which is bent toward the outside of the body plate 2 is fixed with rivets, and a weld seal 5 is applied along the lower edge of the body plate 2. On the other hand, a frame plate 4 is bent outward from the body plate 2, and a weld seal 5 is applied along the lower edge of the body plate 2. A seal packing 10 was sandwiched between the lower bent piece 9 of the frame plate 4 and the flange 8, and the heat exchanger side and the burner case side were connected with screws 11.

That is, the seal packing 10 and the welded seal 5 prevent combustion gas from leaking, and the upper bent piece 12 of the frame plate 4 receives and stops the drain flowing through the inner surface of the body plate 2.

However, in this case, the upper bent piece 12 of the frame plate 4 is heated to a high temperature, and this heat is absorbed by the water pipe 13 for cooling the body plate 2 after passing through the weld seal 5 part. In addition to the long heat transfer path, if the frame plate 4 is made of a material with poor heat transfer properties such as aluminized sawn board, the upper bent piece 12 cannot be cooled sufficiently by heat transfer, resulting in poor durability due to overheating. I was worried about my sexual decline.

The present invention solves these conventional difficulties.
The embodiment shown in the figure will be explained.

Reference numeral 14 designates a body plate of the heat exchanger, which has a bent portion 15 at its lower end bent into a substantially semicircular arc shape with an appropriate radius toward the combustion chamber 24 side.

Reference numeral 16 designates a frame plate which is riveted to the outer surface of the lower end of the body plate 14, and has a flange 17 whose lower part is bent outward to sandwich a packing described later.

18 is a burner case in which a plurality of combustion plates 19 are arranged, and an outward flange 20 is formed at the upper end.
The flange 20, the flange 17 of the frame plate 16, and the body plate 14
A seal packing 21 made of asbestos or the like is sandwiched between the bent portion 15 and the flanges 17 and 20 are tightened with screws 22.

23 is a woodwind wound around the body plate 14.

The present invention has such a configuration, and the seal packing 21
As a result, leakage of combustion gas is completely prevented, and there is no need for a welded seal between the body plate and the frame plate as in the conventional example.

Also, as is clear from the figure, since the body plate 14 is located outside the inner surface of the burner case 18 by the amount of the bent portion 15,
Not only is the effect of combustion heat alleviated compared to conventional examples, but
Since the heat at the tip of the bent portion 15 is absorbed into the water pipe 23 through a short path, overheating of this portion can be prevented, and the durability of the body plate 14 is thereby significantly improved.

In addition to the role of pressing the seal packing 21, the bent portion 15 can also function as a drain receiver, and the drain receiver of the present invention does not require a special structure.

As described above, according to the present invention, the drain receiver can greatly improve the heat resistance of the lower part of the body plate while maintaining its function and sealing performance with the burner case. In a forced air combustion device with a large capacity, an extremely excellent connection structure between the heat exchanger and the burner case can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional example, and FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention. 14... body plate, 15... bending part, 16
...Frame plate, 17...Flange, 18.
...Burner case, 20...Flange,
21... Seal packing, 24... Combustion chamber.

Claims (1)

[Scope of utility model registration request] The lower end of the body plate of the heat exchanger is bent toward the combustion chamber side to form a bent part, and a frame plate having a flange is fixed to the outer surface of the lower end of the body plate, and the flange is shaped outward at the upper end of the burner case. A forced air combustion device characterized in that a seal gasket is held between a flange of a frame plate and a bent part of a body plate, and the flanges are fastened together with screws or the like.