JP2000266408A - Hot air heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of NOx in combustion gas. SOLUTION: A sheathing case 3 is provided on the inner side with a partition plate 5, and the partition plate 5 is provided on the inner side with a combustion device 7 and a blower 9. By driving the blower 9, air is sucked through the air suction port 11 of the sheathing case 3 and heated by the heat of the combustion device 7, and the heated hot air is supplied through the hot air outlet 13 of the sheathing case 3. In a so formed hot air heating device, the combustion device 7 is provided with a combustion box 29 the periphery of which combustion air flows through, and a cooling fin body 51 making contact with combustion air is formed on the outer surface of the combustion box 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a hot air heating device such as a gas fan heater or an oil fan heater.

[0002]

2. Description of the Related Art In general, a partition plate is provided inside an outer case, and a combustion device and a blower are provided inside the partition plate. The blower is driven to suck air from an air suction port of the outer case, thereby producing a combustion device. There has been known a hot air heating apparatus configured to heat the heated air to blow out the heated warm air from a warm air outlet of an outer case.

[0003]

In a conventional hot air heating apparatus of this type, the combustion apparatus includes a burner and a combustion box, in which a flame is formed by the burner, and the combustion gas temperature is about 1000 ° C. To the extent that NO
There is a problem that x occurs.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a hot air heating device capable of reducing the generation of NOx in combustion gas.

[0005]

According to the first aspect of the present invention,
A partition plate is provided inside the outer case, a combustion device and a blower are provided inside the partition plate, and the blower is driven to suck air from an air suction port of the outer case and is heated by the heat of the combustion device. In a hot air heating apparatus configured to blow out the heated hot air from a hot air outlet of an outer case, the combustion device includes a combustion box through which combustion air flows, and the combustion air is provided on an outer surface of the combustion box. The cooling fin body which contacts with this is formed.

According to a second aspect of the present invention, in the first aspect, the cooling fin body extends along a flow direction of the combustion air.

According to a third aspect of the present invention, in the first aspect, the cooling fin body extends obliquely with respect to the flow direction of the combustion air.

According to a fourth aspect of the present invention, in the first aspect, the cooling fins extend perpendicular to the flow direction of the combustion air, and each fin body has an air hole penetrating in the flow direction of the combustion air. Is formed.

In these inventions, since the cooling fin body which is in contact with the combustion air is provided on the outer surface of the combustion chamber, the combustion chamber is cooled by heat exchange with the combustion air, and the cooling of the primary combustion chamber is promoted. Is reduced.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a hot air heater according to the present invention. The warm air heater 1 has a partition plate 5 inside the outer case 3, and is provided with a combustion device 7 and a blower 9 inside the partition plate 5. An air inlet 11 is formed on the back of the outer case 3, and a warm air outlet 13 is formed on the lower front.

During operation of the hot air heater 1, the air inlet 1
After the air sucked in from the combustion device 7 becomes primary air and secondary air in the combustion device 7 and is mixed with fuel and burned, the ventilation passage 15
And a part of the air is blown out from the hot air outlet 13 through the blower 9, and a part of the air passes through the ventilation path 17 between the exterior case 3 and the partition plate 5 to cool the exterior case 3 and then the ventilation path 1.
The air is blown from the hot air outlet 13 through the blower 5 and the blower 9.

As shown in FIGS. 2 and 3, the combustion device 7 has a burner main body 21 composed of a Bunsen burner formed by connecting two metal plates. A flame hole plate 22 is fixed to the upper side of the burner main body 21 by spot welding.
A large number of slit-shaped flame holes 24 are formed in the flame hole plate 22 so as to be arranged in the longitudinal direction, whereby a primary flame hole portion 25 is formed. Further, the combustion device 7 includes a burner main body 21.
A metal combustion box 29 having a primary combustion chamber 27 connected to the primary flame hole 25 and a metal support plate 23 supporting the burner main body 21 are provided.

A rectifying plate 31 is provided at the center of the combustion chamber 29. The rectifying plate 31 is formed with an intermediate flame hole 33 which is opened in a horizontally long rectangular shape. The intermediate flame hole 33 is located between the primary flame hole 25 and the secondary flame hole 35 at the upper end of the combustion chamber 29, and has a width smaller than the width of the primary flame hole 25.

In this embodiment, as shown in FIG. 1, cool combustion air flows from the bottom of the combustion box 29 to the top. The outer surface of the combustion box 29 is shown in FIGS.
As shown in FIG. 5, a cooling fin body 51 that comes into contact with the cold combustion air is formed integrally. The cooling fin body 51 is formed in a U-shaped cross section and extends substantially vertically along the flow direction of the cold combustion air.

The cooling fin body 51 is not limited to the above-described embodiment. For example, as shown in FIG. 5, the cooling fin body 51 may extend obliquely with respect to the flow direction of the cold combustion air, or as shown in FIG. The fins 51 extend substantially horizontally in a direction perpendicular to the flow direction of the combustion air, and each fin body 51 has an air hole 53 penetrating in the flow direction (up and down) of the combustion air as shown in FIG.
May be formed.

Next, the operation of this embodiment will be described.

As shown in FIG. 3, the fuel injected from the nozzle 36 to the burner main body 21 sucks the surrounding air as primary air, and as shown in FIG. The mixture is ejected from each slit-shaped flame hole 24 of the flame hole plate 22 and mixed with the secondary air introduced into the primary combustion chamber 27 through the secondary air hole 38.

For example, when strong combustion is performed at about 3000 kcal / h, primary combustion is performed in the primary combustion chamber 27, and a large primary combustion flame is formed from the primary flame hole portion 25 to the intermediate flame hole portion 33. Combustion box 29 in secondary flame hole 35
Is performed using the air around the secondary air as secondary air, and a secondary combustion flame is formed on the secondary flame hole 35.

In this case, a flame by a burner is formed in the combustion chamber 29, the temperature of the combustion gas reaches about 1000 ° C., and NOx is generated in the combustion gas.

In this embodiment, since the cooling fin body 51 is provided on the outer surface of the combustion box 29 so as to be in contact with the cold combustion air, the combustion box 29 is cooled by heat exchange with the cold combustion air, and the primary combustion chamber 27 is cooled. NOx
Is reduced. In addition, if the primary combustion chamber 27 is extended upward, the primary combustion flame is formed vertically long, and the temperature of the primary combustion flame is reduced by that much, so that the generation amount of NOx is suppressed. Further, in the case where the weak combustion is performed at about 550 kcal / h, the combustion is performed with a small weak combustion flame formed on the primary flame hole 25. In this case, the flame hole plate 2
The rectifying plate 31 is located above the rectifying plate 2, and the rectifying plate 31 suppresses excessive inflow of the secondary air, so that the generation amount of NOx is also suppressed.

Although the present invention has been described based on one embodiment, it is apparent that the present invention is not limited to this.

[0023]

According to these inventions, since the cooling fin body which is in contact with the combustion air is provided on the outer surface of the combustion chamber, the combustion chamber is cooled by heat exchange with the combustion air, and the cooling of the primary combustion chamber is promoted. , NOx is reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hot air heater.

FIG. 2 is a sectional view of a combustion device.

FIG. 3 is a front view of the combustion device.

FIG. 4 is a plan view of the combustion device.

FIG. 5 is a diagram corresponding to FIG. 3, showing another embodiment.

FIG. 6 is a view corresponding to FIG. 3, showing still another embodiment.

FIG. 7 is a diagram corresponding to FIG. 4, showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot air heater 3 Exterior case 5 Partition plate 7 Combustion device 9 Blower 11 Air inlet 13 Hot air outlet 21 Burner main body 23 Support plate 27 Primary combustion chamber 29 Combustion box 51 Cooling fin body 53 Air hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F24H 9/02 302 F24H 9/02 302Z (72) Inventor Koichi Noma 1-1, Dainihigashi-cho, Moriguchi-shi, Osaka No. Sanyo Gas Equipment Co., Ltd. (72) Inventor Akihiko Kogure 1-1, Dainitsuhigashi-cho, Moriguchi-shi, Osaka F-term (reference) 3K017 AA06 AB06 DF04 3K065 TA01 TB04 TB12 TC05 TM06 3L028 AB03 3L037 BB10

Claims (4)

[Claims] 1. A partition plate is provided inside an outer case, and a combustion device and a blower are provided inside the partition plate. The blower is driven to suck air from an air suction port of the outer case, and the heat of the combustion device is reduced. In the hot air heating device configured to blow out the heated hot air from the hot air outlet of the outer case, the combustion device includes a combustion box through which combustion air flows, A hot air heating device, wherein a cooling fin body that contacts the combustion air is formed on an outer surface. 2. The hot-air heating device according to claim 1, wherein the cooling fin body extends along a flow direction of the combustion air. 3. The hot air heating apparatus according to claim 1, wherein the cooling fin body extends obliquely with respect to a flow direction of the combustion air. 4. The cooling fin body extends perpendicular to the flow direction of the combustion air, and each fin body has an air hole penetrating in the flow direction of the combustion air.
A hot air heating device as described.