JPS6250732B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to hot air heaters such as oil fan heaters.

Conventional Structure and Problems Generally, in this type of hot air heater, as shown in FIG. 1, a burner 32 is provided in a main body case 31, and the upper part of the outer periphery of the burner 32 is surrounded by a combustion tube 32 having an upward opening. At the same time, air from a fan 34 is supplied to the outer circumference of the combustion tube 33, and the air from the fan 34 is mixed with combustion gas from the upper part of the combustion tube to produce warm air, which is then heated to the main body case 31. The warm air was blown into the room from a hot air outlet 35 provided at the top.

However, with such hot air heaters, Fan 34
There is a problem in that the outflow of combustion gas from the combustion tube 33 is likely to be hindered by the influence of wind from the combustion chamber, and the flame 36 of the burner 32 spreads outward and comes into contact with the lower part of the combustion tube 33, causing this area to become hot. Ta. As a result, there was a problem in that the fan 34 and various parts inside the main body case 31 were susceptible to thermal deterioration. There are also problems such as the combustion characteristics being deteriorated due to the flame 36 of the burner 32 coming into contact with the combustion tube 33, so it is not preferable for a hot air heater of the type that releases combustion gas into the room as hot air. It wasn't something.

Purpose of the Invention The present invention was made in view of the above points, and aims to prevent thermal deterioration and improve combustion characteristics.

Structure of the Invention In order to achieve the above object, the present invention provides a through hole in the lower part of the combustion tube and surrounds the outer periphery of this hole with a duct so that the air from the fan is taken into the combustion tube through the through hole. be.

DESCRIPTION OF EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 2 to 4. Reference numeral 1 denotes a box-shaped main body case, and a hot air outlet 2 is provided at the lower front surface. 3 is a stand attached to the lower part of the main body case 1; 4 is a burner attached to the stand 3 via a support stand 5; in this embodiment, the third
As shown in the figure, it consists of a vaporizing tube 6, a burner case 7 surrounding the outer periphery of the vaporizing tube 6, and a burner head 8 covering the top of the vaporizing tube 6. Fuel and primary air are supplied to the vaporizer cylinder 6 through the nozzle 9 and air supply throat 10, and secondary air for cooling is supplied to the burner case 7 through the air supply pipe 11. The cooling/secondary air supplied to the burner case 7 is supplied to the flame port 8a of the burner head 8.
It is designed to be supplied to the outer periphery. Reference numeral 12 denotes a hot air path forming body attached to the flange portion 7a of the burner 4, the front opening of which is connected to the hot air outlet 2, and the rear opening connected to the opening 1a provided on the back side of the main body case 1. It's connected. A fan 1 for supplying hot air is connected to this opening 1a via a fan guard 13.
4 is provided.

Reference numeral 15 denotes a bottomless cylindrical combustion tube that surrounds the upper outer circumference of the burner 4, and is attached to the flange portion of the burner 4 via a hot air path forming body wall. Reference numeral 16 denotes through holes provided in the lower part of the combustion tube 15, which are provided substantially evenly over the entire lower circumference of the combustion tube 15 so as to face the flame 17 from the flame port 8a. 18 is this through hole 16
A ring-shaped duct that surrounds the outer periphery of the
The fan 14 is attached to the wall of the hot air path forming body.
An opening 19 is provided on the side. Reference numeral 20 denotes a lid that covers the upper opening 15a of the combustion tube 15, and has an opening 21 formed approximately in the center. Reference numeral 22 denotes a wind shield that covers the upper part of the opening 21, and is designed to prevent the wind from the fan 14 from entering the combustion tube 15 through the opening 21.

In the above configuration, the combustion gas from the burner 4 passes through the upper opening 21 of the combustion tube 15, is guided by the wind shield 22, and flows out into the hot air path forming body 12, and the wind from the fan 14 mixes with this combustion gas. The hot air becomes hot air and is blown into the room from the hot air outlet 2.

Here, a portion of the air from the fan 14 enters into the duct 18 through the opening 19. Then, this air enters the combustion tube 15 through the through hole 16, and the flame 1 formed at the flame port 8a of the burner 4
7 and becomes combustion air. At this time, the flame 17 is pushed by the air from the through hole 16 and is transformed inward as shown in FIG. 2, and is prevented from coming into contact with the combustion cylinder wall. Further, a part of the air that has entered the combustion tube 15 rises along the inner wall surface of the combustion tube 15 as indicated by arrow a, and comes to cool the combustion tube 15. Moreover, when the air passes through the duct 18 before entering the combustion tube 15, it cools the lower part of the combustion tube, which tends to be at the highest temperature.

Furthermore, in this embodiment, since the opening 21 is provided in the upper part of the combustion tube 15 at approximately the center, the combustion gas from the burner 4 flows toward the opening 21 as shown by the arrow b, and the degree of contact with the combustion tube wall increases. There is an advantage that the temperature increase in the combustion tube 15 can be further prevented because the temperature is reduced. Moreover, since the upper part of the opening 21 is covered with a wind shield 22, the wind from the fan 14 is directed to the combustion tube 15.
As a result, the combustion gas in the combustion tube 15 is dispersed to the combustion tube wall side and does not come into contact with the combustion tube wall, which also has the advantage of lowering the temperature of the combustion tube wall. .

In this embodiment, air is also supplied from the burner case 7, albeit weakly, so that the above-mentioned effects are further improved, and the air from the through holes 16 acts as tertiary air for combustion. There is also the advantage that combustion characteristics are further improved.

Effects of the Invention As is clear from the above description of the embodiments, the present invention has the following features:
In addition to cooling the lower part of the combustion tube, which is likely to come into contact with the flame from the burner, the flame is moved away from the combustion tube using the cooling air, so the combustion tube does not become too hot. In addition to eliminating the problem of thermal deterioration due to high temperatures, the flame does not come in contact with the combustion cylinder wall and the combustion characteristics deteriorate, and the air acts as combustion air, improving the combustion condition. There are advantages.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional hot air heater;
The figure is a sectional view of a warm air heater according to an embodiment of the present invention, FIG. 3 is an enlarged sectional view of the main part thereof, and FIG. 4 is a sectional view showing the configuration of a duct portion. 1... Main body case, 2... Warm air outlet, 4...
Burner, 14... Fan, 15... Combustion tube, 16
...Through hole, 18...Duct, 19...Opening, 2
0...Opening, 22...Wind shield.

Claims (1)

[Claims] 1. A main body case having a hot air outlet, a burner provided in the main body case, a combustion tube with an upper opening surrounding the upper outer periphery of the burner, and a hot air fan, A hot air heater in which a through hole is provided in the lower part of the tube, and a duct is provided to surround the outer periphery of the through hole, and the duct opens on the fan side to take in air from the fan. 2. The hot air heater according to claim 1, wherein the combustion tube has an opening smaller than the diameter of the combustion tube in the upper center of the combustion tube. 3. The warm air heater according to claim 1, wherein the hot air outlet is provided at the lower part of the main body case, and the upper part of the opening of the combustion tube is covered with a wind shielding plate.