JPS6350609B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a combustion device.

A conventional combustion device will be explained using FIG. 1. Combustion air A is provided through an air port 2 formed in the exterior 1.
The heat flows into the combustion device, flows downward along the outer surface of the heat exchanger 3, recovers heat released from the outer surface of the heat exchanger 3, and is supplied to the burner 4. heat exchanger 3
is composed of a cylindrical body 6 having a heat exchanger tube 5 wound around its outer surface, and a fan-equipped heat exchanger tube 7 placed on the cylindrical body 6. Combustion air A is divided into primary air and secondary air and supplied to the burner 4. The primary air is used for combustion by being mixed with gas in advance, and is sucked in from the lower part of the burner 4 by the suction force generated by the gas ejected from the nozzle, and is premixed with the gas. The secondary air is used to compensate for the insufficient amount of air from the primary air alone, and is supplied to the combustion chamber 8 through the gap between the heat exchanger 3 and the burner 4 for combustion.

However, in such conventional combustion devices, the radiant heat from the flame of the burner 4 radiates from the lower part of the burner 4, and this radiant heat cannot be recovered, resulting in large heat radiation loss and, therefore, low heat exchange efficiency. There was a problem that it was bad.

In view of the above points, an object of the present invention is to provide a combustion device that can effectively recover radiant heat from a burner flame.

That is, in the present invention, a first heat shield plate for preventing radiation from the flame of a burner is formed into a box shape with an open top, and a heat exchanger is disposed on this first heat shield plate. A combustion chamber is formed by the heat shield plate and the heat exchanger, air for combustion is secured by forming an air intake port in the bottom wall of the first heat shield plate, and a recess is formed below the air intake hole. By arranging the second heat shield plate in the form of a face plate with its concave surface facing upward, radiant heat from the air intake port can also be recovered.

An embodiment of the present invention will be described below based on the drawings. In FIG. 2, reference numeral 10 denotes an exterior that is made of a cylindrical body with a closed bottom and has a plurality of air ports 11 formed in the upper part of the peripheral wall.
A heat shield plate 12 and a heat exchanger 13 are provided. The first heat shield plate 12 is formed into a box shape with an open top, and the heat converter 13 is arranged on the first heat shield plate 12. This heat exchanger 13
is a cylindrical body 15 with a heat exchanger tube 14 wound around its outer surface.
and the finned heat exchanger tube 1 placed on the cylindrical body 15.
6, and a combustion chamber 17 is formed by the heat exchanger 13 and the first heat shield plate 12. A plurality of burners 18 are arranged in the lower part of the combustion chamber 17, and an air intake port 19 is formed in the center of the bottom wall of the first heat shield plate 12. Further, below the air intake port 19, a second heat shield plate 20 having a concave plate shape is arranged with its concave surface facing upward.

In the combustion apparatus configured as described above, combustion air B enters the combustion apparatus through the air port 11 of the exterior casing 10, flows downward along the outer surface of the heat exchanger 13, and flows between the first heat shield plate 12 and the second heat shield plate 12. It is supplied to the burner 18 through the air intake port 19 and between the heat shield plate 20 and the heat shield plate 20 . When the combustion air B flows downward along the outer surface of the heat exchanger 13, it recovers heat radiation loss from the outer surface of the heat exchanger 13 and is supplied to the burner 18, contributing to improving heat exchange efficiency. are doing. The first heat shield plate 12 is
It is made of a thin metal plate and has the function of preventing radiation from the flame of the burner 18. Radiant heat from the flame of the burner 18 is recovered by reflection by the first heat shield plate 12 and heat conduction from the first heat shield plate 12 to the burner 18. The second heat shield plate 20 is for preventing radiation from the air intake port 19. By the way, when the flat second heat shield plate 21 is used as shown in FIG. It escapes to the outside through the gap between the
Since the second heat shield plate 20 is formed into a concave plate shape, all of the radiant heat C from the flame of the burner 18 is recovered into the combustion chamber 17, as shown in FIG. In this way, heat radiation loss due to radiant heat that conventionally escaped from the lower part of the burner 4 can be effectively prevented, and heat exchange efficiency is improved.

As explained above, according to the combustion device according to the present invention, the first heat shield plate is formed in a box shape with an open top surface, and the heat exchanger tube is disposed on the first heat shield plate and is disposed on the outer surface. A combustion chamber is formed by a heat exchanger consisting of a cylindrical body around which the cylindrical body is wound and a heat exchanger tube with fins placed on the top of the cylindrical body, and a burner is disposed at the bottom of the combustion chamber. An air intake port is formed in the bottom wall of the first heat shield plate, and a second heat shield plate in the form of a concave plate is placed below the air intake hole with its concave surface facing upward, so that it is protected from the burner flame. The radiant heat from the burner can be recovered by the first heat shield plate, and the radiant heat that escapes from the air intake port of the first heat shield plate can also be recovered by the second heat shield plate, so there is less heat loss from the burner. , it is possible to improve heat exchange efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional front view of a conventional combustion device, FIG. 2 is a schematic longitudinal sectional front view showing an embodiment of the present invention,
FIG. 3 is an explanatory diagram of the case where a flat plate is used as the second heat shield plate, and FIG.
FIG. 3 is an enlarged sectional view of the vicinity of the heat shield plate. 12...First heat shield plate, 13...Heat exchanger, 1
4... Heat exchanger tube, 15... Cylindrical body, 16... Heat exchanger tube with fins, 17... Combustion chamber, 18... Burner, 19
...Air intake, 20...Second heat shield plate.

Claims (1)

[Claims] 1. A first heat shield plate formed in a box shape with an open top, a cylindrical body placed on the first heat shield plate and having a heat transfer tube wound around its outer surface, and arranged on the top of the cylindrical body. A combustion chamber is formed by a heat exchanger consisting of a finned heat exchanger tube, a burner is disposed at the bottom of the combustion chamber, and an air intake is formed in the bottom wall of the first heat shield plate. A combustion device further comprising: a concave plate-shaped second heat shield plate disposed below the air intake port with its concave surface facing upward.