JP2966574B2 - Hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Laid-Open Publication No. Sho 62-60856, for example, a warm air blower of this type is provided in an outer case having a warm air outlet and a warm air blower. An air duct is provided to communicate the air with the hot air blower.The combustion section faces the lower part of the combustion tube set up on the bottom plate of this air duct, and the air from the hot air blower is blown into the air duct. Heat is exchanged with the cylinder, and the warm air is discharged from the warm air outlet into the room to perform heating. Also,
At the front of the upper plate of the air duct above the combustion tube, an inclined portion inclined forward and downward is formed, and the air from the hot air blower sent into the air duct is blown by the aforementioned inclined case to the exterior case. It is designed to be guided to a hot air outlet formed at a lower portion or a central portion of the front surface.

[0003]

However, according to the above-described hot air heater, the right and left corners where the upper plate of the air duct and the left and right side plates intersect are substantially right angles.
This stagnation of the blown air occurs at the corners, causing a pressure loss, resulting in an increase in blown noise and a loss of blown amount.

The present invention has been made in view of the above circumstances, and has as its object to reduce blowing noise and increase the amount of blowing.

[0005]

According to the present invention, there is provided an outer case having a hot air outlet and a hot air blower, and a blow duct provided in the outer case for guiding the blow of the hot air blower to the hot air outlet. And a combustion tube provided in the air duct, wherein the air duct is provided with a bottom plate having the combustion tube disposed in the center, left and right side plates rising from both sides of the bottom plate, and left and right side plates. In the warm air heater configured with an upper plate attached between upper portions, the upper plate of the blower duct has a central inclined surface inclined forward and downward at the center, and the upper surface of the central inclined surface The left and right sides are configured such that side inclined surfaces inclined downward toward the side are formed on both sides.

[0006]

With this configuration, the stagnation of the blown air at the left and right corners of the upper portion of the blower duct is significantly reduced as compared with the conventional case, and the blown air is smoothly guided to the hot air outlet.
As a result, the pressure loss inside the air duct can be reduced, the air volume can be increased, and a sufficient air volume can be obtained even if the rotation speed of the fan is lower than before, so that the air noise is reduced. be able to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a box-shaped outer case having a hot air outlet 2 at a substantially central portion of a front surface and a hot air blower 3 at a back portion. An air duct 4 for guiding the air blow to the hot air outlet 2 is provided. In addition, a bulging portion 5 protruding rearward from the rear edge of the top plate 1B is formed on the back plate 1A of the outer case 1.

Reference numeral 6 denotes a burner disposed at a lower portion in the outer case 1 for vaporizing, premixing and burning liquid fuel (kerosene). The burner 6 is provided on the vaporizing cylinder 7 and on the upper part of the vaporizing cylinder 7. A burner head 8 as a combustion unit, a bottomed cylindrical burner case 9 surrounding the outer periphery of the vaporizing cylinder 7 and attached to the bottom plate 4A of the ventilation duct 4, and supplying primary air into the vaporizing cylinder 7. , A combustion blower 10 for supplying secondary air into the burner case 9, and the burner head 8 faces a lower part inside the combustion cylinder 11 having upper and lower openings projecting above the bottom plate 4 </ b> A of the ventilation duct 4. There is not.

The ventilation duct 4 has a combustion cylinder 11 at substantially the center.
And a pair of side plates 4B, 4B raised from the left and right sides of the bottom plate 4A with a space between the left and right sides of the bottom plate 4A and a pair of side plates 4B, 4B. An upper plate 4C attached to the upper portion of the combustion tube 11 at a distance from the upper surface of the combustion tube 11, and a hot air outlet 2
And a front plate 4D suspended down to the upper edge. Also, the upper plate 4C has a rear mounting edge 1 at the center.
2, a central inclined surface 13 inclined forward and downward is formed, and side inclined surfaces 14 and 14 inclined from the left and right side edges of the central inclined surface 13 are separated from each other. Is formed.

The hot air blower 3 includes a propeller fan 16 interposed in an air suction port 15 provided in the bulging portion 5.
, A motor 17, and a fan guard 18 attached to the outer surface of the back plate 1 </ b> A of the outer case 1 and supporting the motor 17.
The center of rotation a of the propeller fan 16 is located below the upper end of the combustion cylinder 11 and faces the peripheral wall of the combustion cylinder 11 as shown in FIG.

In the above configuration, the vaporizing cylinder 7 of the burner 6
Inside, a fuel tank (not shown) supplies liquid fuel (kerosene) and primary air for combustion is supplied from a combustion blower 10 to premix the vaporized gas of the fuel and the primary air in the vaporization cylinder 7. , And the mixed gas is supplied from the burner head 8 to the combustion cylinder 1.
1. Spout into 1 to burn. Here, when the hot air blower 3 is driven, the indoor air is sucked from the air suction port 15 by the rotation of the propeller fan 16, and the air is blown into the blow duct 4. This wind is guided by the bottom plate 4A, the left and right side plates 4B, 4B, and the upper plate 4C of the blower duct 4 while being in contact with the outer surface of the combustion tube 11 and exchanging heat.
Sent to

Then, the combustion gas generated by the combustion of the burner 6 rises in the combustion tube 11 and flows upward in the blower duct 4, where it mixes with the wind above the propeller fan 16.
The air is guided by the central inclined surface 13 and the side inclined surfaces 14 and 14 of the upper plate 4C, flows to the hot air outlet 2, and is discharged from the warm air outlet 2 into the room as warm air.

According to this embodiment, the upper plate 4C of the blower duct 4 for guiding the blown air from the propeller fan 16 to the hot air outlet 2 has a central inclined surface 13 inclined forward and downward at the center thereof. In addition, on both sides of the central inclined surface 13, left and right side inclined surfaces 14, 14 inclined downward from the left and right side edges of the central inclined surface 13 are separated from each other. Therefore, the wind sent by the blower 3 is guided to the hot-air outlet 2 smoothly without substantially stagnating in the blower duct 4. For this reason, the pressure loss inside the air duct 4 is reduced, the air volume can be increased, and even if the rotation speed of the propeller fan is reduced, a sufficient air volume can be secured, and the air noise can be reduced. Things.

Further, since the flow of air in the left and right corners of the upper part of the air duct 4 becomes smooth without stagnation, the temperature distribution of the hot air becomes substantially uniform over the entire width of the hot air outlet 2, so that the local It is possible to prevent overheating of the hot air blowing portion, and to uniformly blow out the hot air into the room.

[0015]

Since the present invention is constructed as described above, the stagnation of blast air in the corner portion above the blast duct can be eliminated, the blast can be smoothly guided to the hot air outlet, and the amount of blast can be increased. In addition, the fan noise can be reduced, the sound is quiet, and good hot air heating can be performed.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of a main part of an oil hot air heater according to an embodiment of the present invention.

FIG. 2 is a cutaway side view of a relevant part.

FIG. 3 is a perspective view of a blower duct provided with a combustion tube.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 outer case 2 hot air outlet 3 hot air blower 4 air duct 4A bottom plate 4B side plate 4C top plate 13 central inclined surface 14 side inclined surface

Claims (1)

(57) [Claims] 1. An outer case having a hot air outlet and a blower for hot air, an air duct provided in the outer case, and guiding air from the blower for hot air to the hot air outlet, and an air duct provided in the air duct. A bottom plate having the combustion tube disposed in the center thereof, left and right side plates rising from both sides of the bottom plate, and an upper plate attached between upper portions of the left and right side plates. In the warm air heater configured as above, the upper plate of the blower duct has a central inclined surface formed in the center and inclined forward and downward, and the left and right sides of the central inclined surface are respectively provided with side lower portions. A warm air heater characterized in that a side inclined surface inclined toward the surface is formed.