JP2871394B2 - 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 Generally, as shown in FIG. 3, a hot air heater of this kind is provided with a burner head 3 in which a wire mesh 2 is disposed on the outer periphery of a peripheral wall in a main body case 1; And a duct 6 surrounding the outer periphery of the through hole 4 to supply air from a propeller fan 7 to the outer periphery of the combustion tube 5. Part of the wind from the fan 7 is mixed into the flame 9 formed in the flame hole 8 of the burner head 3 through the duct 6 and acts as a part of the combustion air.

[0003]

However, in the above-described conventional configuration, when the propeller fan 20 is rotating clockwise as shown by an arrow a as shown in FIG. 4, the wind from the propeller fan 20 is indicated by an arrow b. As shown, a large amount easily enters through a through hole 22a provided in the right rear portion 21a of the combustion cylinder 21. As a result, when the overlapping portion 24a of the wire mesh 24 disposed on the outer periphery of the peripheral wall of the burner head 23 comes to this portion, the flame 25a having a weak flame holding force of the overlapping portion 24a is blown away by the wind and blows off, thereby deteriorating the combustion exhaust gas characteristics. There has been a problem that abnormal sounds such as blowing noises are generated. This occurs in the left rear portion of the combustion cylinder 21 when the propeller fan 20 rotates counterclockwise, and is caused by the characteristics of the propeller fan 20.

[0004] The present invention solves the above-mentioned problems, and eliminates the phenomenon that a flame having a weak flame holding power is blown off by wind by a part of combustion air supplied from a propeller fan, and improves combustion characteristics. It is intended to aim at.

[0005]

According to the present invention, in order to attain the above object, the overlapping portion of the burner head wire mesh arranged on the outer periphery of the peripheral wall is formed by rotating the propeller fan to the left rear of the burner head when the propeller fan rotates clockwise and to the right rear when rotating the propeller fan counterclockwise. In the configuration.

[0006]

According to the present invention, a part of the wind from the propeller fan is mixed with the flame formed in the flame hole of the burner head from the through hole in the rear part of the combustion cylinder by the above structure, and a part of the combustion air is formed. In this case, good combustion exhaust gas characteristics can be obtained without blowing the flame.

[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 main body case, which is provided with a warm air outlet 15 on the lower front surface. Reference numeral 8 denotes a mounting table attached to the lower portion of the main body case 1, 10 denotes a burner case located above the mounting table 8, and a vaporizing cylinder 11 is installed in the burner case 10. Is covered with a burner head 3 having a large number of flame holes 12 all around. Reference numeral 2 denotes a wire mesh disposed on the outer periphery of the peripheral wall of the burner head 3 and partially has an overlapping portion 3a.
Reference numeral 13 denotes a hot air path forming body mounted on the flange portion 10a of the burner case 10 and has openings at front and rear portions.
The front opening is connected to the hot air outlet 15, and the rear opening is connected to the opening 1 a provided on the back of the main body case 1. The opening 1a is provided with a propeller fan 7 for supplying hot air via a fan guard 14. Reference numeral 5 denotes a bottomless cylindrical combustion tube surrounding the upper part of the outer periphery of the burner head 3 and is mounted on a flange portion 10a of the burner case 10 via a wall of a hot air path forming body 13. Reference numeral 4 denotes a through hole provided in the lower portion of the combustion tube 5 and is provided over the entire lower periphery of the combustion tube 5 so as to face a flame 9 from a flame hole 8 provided in the peripheral wall of the burner head 3. When the propeller fan 7 rotates clockwise, the overlapping portion 2a of the wire netting 2 is located on the left rear side of the burner head 3 and when the propeller fan 7 rotates leftward, on the right rear side. Reference numeral 6 denotes a ring-shaped duct provided so as to surround the outer periphery of the through hole 4 at the lower portion of the combustion tube 5, which is attached to the wall of the hot air path forming body 13, and the propeller fan 7 side is an open portion 6a.

In the above configuration, the combustion gas from the burner head 3 flows out from above the combustion tube 5 and mixes with the air from the propeller fan 7 in the hot air path forming body 13 to become hot air, and the hot air is blown from the hot air outlet 15 into the room. Blow out to.

Here, a part of the wind from the propeller fan 7 enters the duct 6 through the opening 6a, and
The fuel is further supplied into the combustion cylinder 5. At this time, the rear through-hole 4a located on the propeller fan 7 side of the combustion cylinder 5, that is, the right rearward when the propeller fan 7 rotates rightward and the left rearward when the propeller fan 7 rotates leftward, the wind from the propeller fan 7 In contrast, the supply of wind is relatively small to the rear left when rotating clockwise and to the rear right when rotating counterclockwise.
Therefore, the overlapping portion 2a of the wire mesh 2 disposed on the outer periphery of the peripheral wall of the burner head 3 is provided at a portion where the supply of the wind is relatively small.
, The actual opening area of the flame hole at that portion is reduced from that of the other portion due to the overlap of the wire mesh 2, so that the flame that has deteriorated in the flame holding property does not blow off. Generation of carbon monoxide due to
Good combustion exhaust gas characteristics are obtained.

[0011]

As is apparent from the above description of the embodiment, according to the present invention, a part of the wind from the propeller fan passes through the flame formed in the flame hole of the burner head from the through hole at the rear part of the combustion cylinder. In the case where it mixes into the air and acts as a part of combustion air, good combustion exhaust gas characteristics can be obtained without blowing off the flame.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a hot air heater in one embodiment of the present invention.

FIG. 2 is a perspective view of the burner unit.

FIG. 3 is a cross-sectional view of the hot air heater.

FIG. 4 is a plan view of a main part of a conventional hot air heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 2 Wire mesh 2a Wire mesh overlapping part 3 Burner head 4 Through hole 5 Combustion cylinder 6 Duct 7 Propeller fan 8 Flame hole 15 Hot air outlet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-155152 (JP, A) JP-A-63-108153 (JP, A) JP-A-63-3145 (JP, A) JP-A 61-108 208465 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) F24H 9/02 302 F24H 3/04 301

Claims (1)

(57) [Claims] 1. A main body case having a hot air outlet, a burner head provided in the main body case, having a plurality of flame holes all around the peripheral wall, and a wire mesh arranged on the outer periphery of the peripheral wall, and surrounding an upper outer periphery of the burner head. A combustion cylinder having an upper opening, a plurality of through-holes provided on the lower peripheral wall of the combustion cylinder and distributed throughout the circumference thereof, a duct provided so as to surround the outer periphery of the through-hole and having an open rear portion; A propeller fan for hot air that supplies air into the duct from the open portion, and the propeller fan is positioned at the left rear of the burner head when the propeller fan rotates clockwise and at the right rear when rotated counterclockwise. Hot air heater.