JPS61228213A - Burner - Google Patents

Abstract

PURPOSE:To offer a burner which secures airtightness of more than a fixed level to thermal deformation of a burner and combustion chamber and does not make combustion of the burner deteriorate, by a method wherein central parts in a longitudinal direction of the lower end parts of guides A, B and a central part of a secondary combustion chamber in a longitudinal direction of the same are connected with each other by a claw and fitting hole in which the claw is fitted with a clearance. CONSTITUTION:Fitting holes 32a, 33a are provided on bent parts 32, 33 obtained by bending in a horizontal direction a central part of the lower end parts at the front and rear in a longitudinal direction of a secondary combustion chamber 25 by notching the central part so that a gap more than a fixed level is not generated among the lower end part 25a of the secondary combustion chamber 25 and the lower end parts 26a, 27a of guides A26, B27, and on the other hand, a claw 34 fitting in the fitting hole 32a is formed by notching the central part in a longitudinal direction of the lower end parts 26a, 27a of the guides A26, B27. The gap, therefore, among the secondary combustion chamber 25 and the guides A26, B27 becomes large, through which a matter that combustion of each burner is deteriorated can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device, such as a gas hot air heater, that has an improved airtight structure between a burner for burning gas and a combustion chamber.

BACKGROUND OF THE INVENTION Conventionally, in many combustion devices of this type, the n1 of the burner was high and the combustion characteristics in low oxygen conditions were poor. On the other hand, in order to save energy, fan heaters that operate in a strong combustion-weak combustion-stop mode are increasing in number, and as the number of heating and cooling increases in each part of the burner and combustion chamber, consideration for thermal distortion is required. It's arrived.

For example, FIG. 4 shows a cross-sectional view of a conventional hot air heater. The combustion part (upper surface side) of the small-capacity small burner 1 and the large-capacity large burner 2, which are arranged side by side, are covered by a secondary combustion chamber 3, and the secondary combustion chamber 3 is connected to the front and rear guides A4 and Guide B
The structure is such that it is in close contact with the lower ends 4a, 5a of 5. And 2
The secondary combustion chamber 3 is an afterburning chamber for improving combustion during low oxygen conditions. The high-temperature combustion gas 6 burned in the secondary combustion chamber 3 of the small burner 1 and the large burner 2 is mixed with air sucked by the guide C7 and the guide D8 from the suction port 14 of the main body case 13 by the rotation of the fan 9. Passage 1
5, 16, and 17 and is blown out from the air outlet 10.

Problems to be Solved by the Invention However, since the secondary combustion chamber 3 is configured to cover the upper surfaces of the small burner 1 and the large burner 2, it is exposed to high temperatures. On the other hand, the guide A4 is also exposed to high temperatures because hot air flows in front and behind it. The other guide B5 is
The air is cooled on the inflow side, but on the other hand, the secondary combustion chamber 3
Because the sides are exposed to high-temperature air, they also become quite hot. In this way, 2 covers the small burner 1 and the large burner 2.
The secondary combustion chamber 3, the guide A4, and the guide B5 both become high in temperature and expand because the large burner 2 and the small burner 1 burn during strong twist firing. On the other hand, when the combustion becomes weak, the large burner 2 stops and only the small burner 1 burns, so the guide A4
The temperature of the guide B5, (!E, etc.) and the secondary combustion chamber 3 is also lower than that during strong twist firing.

Further, when the engine is stopped, the small burner 1 and the large burner 2 are also extinguished, so that the secondary combustion chamber 3 is also cooled, and the guides A4 and B5 are also cooled and contracted.

Due to the above heating and cooling cycles, the guide A4 and the guide B5, as well as the secondary combustion chamber 3, are thermally deformed, and the gap shown in FIG. The gaps a and b of each guide B5 are widened, and the high-temperature combustion gas 6 is drawn directly by the fan 9 through the widened gaps a and b instead of from the upper ends of the guides A4 and B5, thereby changing the combustion state of the burner. It could make things worse.

The present invention solves the above-mentioned problems, and aims to provide a combustion device that ensures airtightness of the burner and combustion chamber against thermal deformation and does not deteriorate the combustion of the burner.

Means for Solving the Problems In order to achieve the above object, the combustion apparatus of the present invention has a guide A.
The central portion in the longitudinal direction of the lower end of B and the central portion in the longitudinal direction of the secondary combustion chamber are connected by a pawl and a fitting hole into which the pawl loosely fits.

Effect The above means adjusts the combustion amount of the burner and cools it by stopping it.
Even if heating is repeated, the pawl and the fitting hole can ensure a certain level of airtightness against thermal deformation of the burner and the secondary combustion chamber, thereby preventing deterioration of combustion in the burner.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the drawings of FIGS. 1 to 3.

Reference numeral 20 denotes a main body case of the fan heater, which has a suction port 21 at the upper rear surface and a hot air outlet 22 at the lower front surface. 23.24
is a large burner with a large combustion amount and a small burner with a small combustion amount that are installed side by side. During strong twist firing, both burn, only the small burner 24 burns during weak combustion, and both burn when heating is stopped. to stop.

Reference numeral 25 denotes a secondary combustion chamber whose lower end 25a is tightly wound and fixed around the outer periphery of large and small burners 23, 24, and has an opening 25b at its upper surface along the longitudinal direction. 26 and 27 are attached to the lower end 25a of the elongated flat secondary combustion chamber 25;
7a in airtight contact and fixing both ends to form the secondary combustion chamber 2.
The upper ends of the front and rear guides A and B surrounding the combustion chamber 5 are open above the secondary combustion chamber 25. 28 is a guide A26° and a guide C covered with a gap above the upper end opening of B27.
Reference numeral 129 denotes a guide D that forms passages 30.31 between the guide C28 and the guide A26, and between the main body case 20.

In the above configuration, when the large and small burners 23, 24 are combusted, the secondary combustion chamber 25, guide A 26, and guide B 27 also become high temperature, and the burners that have combusted both burners 23, 24 have strong combustion and weak combustion. Heating and cooling are repeated by (when the small burner 24 is combusted) and stopped (when the combustion of both burners is stopped).

Therefore, the lower end 25a of the secondary combustion chamber 25 and the guide A26
and the lower end portion 26a of the guide B27.

Fitting holes 32a, 27a are formed in bent portions 32.degree. 33, which are formed by cutting out the central portions of the front and rear lower ends in the longitudinal direction of the secondary combustion chamber 25 and bending them in the horizontal direction, so as not to create a gap above a certain level in the secondary combustion chamber 27a.
33a, and a claw 3 that loosely fits into the fitting hole 32a.
4, the lower end portion 26a of the guide A26 and the guide B27,
It is formed by cutting out the central part in the longitudinal direction of 27 m.

FIGS. 2 and 3 show the fitting holes 32a, 33a and the claws 34.
shows a detailed view of the insertion section of the .

In the combustion device configured in this way, even if the secondary combustion chamber 25, guide A 26, and guide B 27 are thermally deformed due to heating and cooling, and the left and right gaps of θ and @ shown in FIG. 2 become zero, , the dimensions of the secondary combustion chamber 25 and the guide A 26 and the guide B 27 are determined so that the overlapping margin is ensured, so that the high temperature combustion gas 6 flows between the lower end 25a of the secondary combustion chamber 25 and the lower ends of the guide A 26 and the guide B 27. Part 26a
.

It is possible to prevent combustion from worsening due to being drawn directly by the fan 36 through the gap 27a. In addition, in Fig. 2, the front and rear deviations between the secondary combustion chamber 25 and the burners 23 and 24 are shown as ■ and ◎, which regulates the front and rear deviations between the secondary combustion chamber 25 and the burners 23 and 24. This limit is set to prevent combustion from worsening, and also prevents misalignment during product transportation.

As described above, according to this embodiment, the gaps between the secondary combustion chamber 25 and the guides A26 and B27 are increased, and it is possible to prevent the combustion of each burner from deteriorating.

As described in detail, according to the present invention, the following effects can be obtained.

(1) Even if the secondary combustion chamber and guides A and B are thermally deformed due to repeated heating and cooling, the gaps between the secondary combustion chamber and guides A and B are regulated, so combustion will not deteriorate. do not have.

(21 Also, since the gaps between the secondary combustion chamber and guides A and B are regulated, high-temperature combustion gas will not pass through the gaps between the secondary combustion chamber and guides A and B, preventing abnormal heating of the burner. It can be prevented.

(3) Furthermore, since the positional deviation between the secondary combustion chamber and the burner is controlled, the relative positions will not be misaligned even when the product is transported or dropped.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a gas fan heater that employs a combustion device according to an embodiment of the present invention, Fig. 2 is a top view of the combustion device, and Fig. 3 is a diagram showing main parts of the combustion device. FIG. 4 is a longitudinal sectional view of a conventional combustion device. 23.24...Large and small burners (burners), 25
...Secondary combustion chamber, 26...Guide A1
27... Guide B132a, 33a...
- Fitting hole, 34...claw. Name of agent: Patent attorney Toshio Nakao and 1 other person34
−Marube

Claims (1)

[Claims] A burner that has a secondary combustion chamber at the top and can adjust the amount of combustion; guides A and B that have a lower end in airtight contact with the combustion chamber and surround the secondary combustion chamber; and guides A and B that are located below the burner. and a fan that warms the air sucked in from the suction port with combustion gas from a burner and discharges warm air from the blow-off port, and includes a longitudinal center portion of the lower ends of the guides A and B and a longitudinal portion of the secondary combustion chamber. A combustion device in which the central portion in the direction is connected by a pawl and a fitting hole into which the pawl loosely fits.