JPH06347006A - Hot-air furnace - Google Patents

Abstract

PURPOSE:To lessen the decline of the temperature of the vaporizer so as to prevent the generation of offensive small, tar, etc. CONSTITUTION:There are provided a box-shaped housing 1 having a warm air outlet 2 in the front, an air-passing chamber 3 provided inside the housing 1, a combustion device 4 placed in the air-passing chamber 3, and a blower 9 by which the room air heated by the combustion device 4 is discharged through the warm air outlet 2. A fuel pipe 23 for feeding liquid fuel to the combustion device 4 is inserted into the air-passing chamber 3.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A hot air heater of this type is disclosed in Japanese Patent Publication No. 4-453.
55, etc. That is, a conventional warm air heater will be described with reference to FIG. 4. Reference numeral 1 is an outer case, 2 is a hot air outlet provided in the front surface of the outer case 1, and 3 is a ventilation chamber provided in the outer case 1. Reference numeral 4 is a combustion device, and 5 is a burner case of this combustion device, to which the burner case 5, the combustion tube 6, the heat exchanger 7, and the exhaust hood 8 are sequentially connected. Reference numeral 9 is a blower for discharging the indoor air heated by the combustion device 4 from the warm air outlet 2 and 10 is a burner fan.

Further, in FIG. 5, reference numeral 11 is a burner main body provided in the burner case 5 of the combustion device 4,
The burner body 11 includes an electric heater 12 and an electric heater 1.
2 comprises a carburetor 13 in which it is buried, and a burner head 14 attached to this carburetor 13. Reference numerals 15, 15 ... Are flame holes provided in a large number in the burner head 14. Further, 16 is a fuel pipe for supplying fuel to the carburetor 13, and a fuel injection part 17 is provided at the tip of this fuel pipe 16. Reference numeral 18 denotes an air supply pipe for supplying combustion air into the carburetor 13, and the tip of the fuel injection part 17 is inserted into the air supply pipe 18 and faces the inside of the carburetor 13. Reference numeral 19 is a partition plate that is attached to the lower portion of the combustion cylinder 6 and divides the interior of the exterior case 1 into upper and lower parts.

The operation of the above-described structure will be described. The liquid fuel jetted into the carburetor 13 through the fuel pipe 16 from the fuel jet portion 17 at the tip is vaporized by the inner wall of the vaporizer 13. At this time, the vaporized fuel is mixed with the combustion air supplied from the burner fan 13 into the vaporizer 13 through the air supply pipe 18, and is burned as a mixed gas.
It is ejected from the flame holes 15, 15 ... Provided in the na head 14. The mixed gas ejected from the flame holes 15, 15 ... Is ignited and burned by receiving an electric discharge from an ignition plug (not shown). When the temperature of the heat exchanger 7 rises, the blower 9 operates to send indoor air into the ventilation chamber 3, heat exchange and heat the heat exchanger 7 and the combustion device 4, and then discharge the hot air from the hot air outlet 2. Warm air is sent out.

[0005]

Generally, in this type of liquid fuel combustion apparatus, the temperature inside the vaporizer is kept uniform, so that the vaporization of the liquid fuel on the inner wall of the vaporizer is made uniform.
The concentration of the mixed gas is constant.

However, in the above-described liquid fuel combustion apparatus, the liquid fuel ejected from the fuel ejection portion 17 at the tip of the fuel pipe 16 is at a low temperature as compared with the temperature inside the carburetor 13 (about 350 ° C.). There has been a problem that the jetted liquid fuel causes a local temperature drop in the carburetor 13. As a result, it takes time to vaporize the liquid fuel,
It was a cause of offensive odor and tar.

The present invention has been made in view of the above-mentioned facts, and it is an object of the present invention to suppress the local temperature decrease in the vaporizer to suppress the generation of foul odor and tar.

[0008]

According to the present invention, a box-shaped exterior case having a hot air outlet on the front surface, a ventilation chamber provided in the exterior case, a combustion device arranged in the ventilation chamber, and A blower for discharging indoor air heated by a combustion device from a hot air outlet, and a fuel pipe for supplying liquid fuel to the combustion device is inserted into the ventilation chamber.

[0009]

With this structure, the liquid fuel passing through the fuel pipe is warmed by the radiant heat from the combustion device and the indoor air heated by the combustion device, so that the local temperature drop of the carburetor is reduced, It is possible to suppress the generation of foul odors and tar.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. That is, in FIG. 1, 1 is an outer case, 2 is a hot air outlet provided in the front surface of the outer case 1, 3 is a ventilation chamber provided in the outer case 1, and 4 is a combustion device arranged in the ventilation chamber 3. Yes, in the burner case of this combustion device 4,
The combustion cylinder 6, the heat exchanger 7, and the exhaust hood 8 are sequentially connected. Reference numeral 9 is a blower for discharging the indoor air heated by the combustion device 4 from the warm air outlet 2 and 10 is a burner fan.

Further, in FIG. 2, reference numeral 11 denotes a burner body provided in the burner case 5 of the combustion device 4,
The burner body 11 includes an electric heater 12 and an electric heater 1.
It is composed of a bottomed cylindrical carburetor 13 in which 2 is embedded, and a disc-shaped burner plate 20 attached to the carburetor 13. The carburetor 13 is formed by aluminum die-casting with good heat dissipation, and the burner plate 20 is formed by fine ceramics such as petalite that is resistant to heat shock and excellent in impact resistance. A large number of flame holes 21, 21, ... Are provided side by side in the circumferential direction in the burner plate. Further, reference numeral 22 is an air introduction port, and the air introduction pipe 22 is formed so as to reduce in a funnel shape from the outside toward the inside. 23 is a vaporizer 1 for liquid fuel (kerosene) sent from a fuel pump (not shown).
3 is a fuel pipe to be supplied into
Is introduced into the burner case 5 through the peripheral wall of the burner case 5, and is also inserted into the air introduction port 22. A fuel ejection portion 24 is provided at the tip of the fuel pipe 23, and an ejection port 24A at the tip of the fuel ejection portion 24 faces the interior of the carburetor 13 in an obliquely downward direction. Two
Reference numerals 5, 25, ... Are a large number of small projections provided on substantially the entire inner bottom surface of the vaporizer 13 and enlarge the vaporization area.

Reference numeral 26 is a diaphragm plate mounted inside the carburetor 13 above the air introduction port 22, 27 is a baffle plate integrally formed with the diaphragm plate 26 disposed below the diaphragm port 28 of the diaphragm plate 26,
Numeral 29 is attached to the lower part of the burner case 5 and the outer case 1
It is a partition plate that divides the inside of the room into upper and lower parts.

In the above structure, when the carburetor 13 is heated up to the vaporization temperature of the liquid fuel by energizing the electric heater 12, the burner fan 10 and the fuel pump (not shown).
Is activated, liquid fuel is supplied into the carburetor 13 from a fuel injection part 24 provided at the tip of the fuel pipe 23, and combustion air is supplied from the air inlet 22 as primary air to the carburetor 1.
3 is supplied inside. Here, the liquid fuel supplied to the inside of the carburetor 13 is scattered as fine particles due to the synergistic action of the primary air flow ejected from the air inlet 22 and the discharge pressure of the fuel pump, and the inner peripheral surface of the carburetor 13 is scattered. And small projection 2 on the inner bottom surface
5 and 25 are contacted with and vaporized.

Then, the mixed gas of the vaporized gas and the primary air becomes a uniform mixed state when passing through the throttle port 28 of the throttle plate 26, and each flame hole 21, 21, ... Of the burner plate 20.
The mixed gas thus ejected is ignited by a spark discharge of an igniter (not shown), forms a flame on the burner plate 20, and starts combustion. On the other hand, a part of the combustion air supplied from the burner fan 10 is supplied to the upper part of the flame as secondary air to promote secondary combustion.
Further, the flame formed on the burner plate 20 heats the upper portion of the carburetor 13, and this heat is conducted to the lower portion of the carburetor 13 to maintain the vaporized portion at the vaporizable temperature. At that point, the electricity to the electric heater 12 is stopped, but the combustion can be continued.

When a temperature sensor (not shown) senses the temperature rise of the heat exchanger 7, the blower 9 operates to take in the indoor air into the ventilation chamber 3, and the combustion device 4 and the heat exchanger 7 are introduced in the ventilation chamber 3. After heating and exchanging heat with, the hot air is discharged from the hot air outlet 2 to send hot air into the room. At this time, since the fuel pipe 23 is installed on the leeward side in the ventilation chamber 3 and penetrates the peripheral wall of the burner case 5 and is introduced into the burner case 5, the liquid fuel in the fuel pipe 23 remains warm. It is warmed by the radiant heat from the wind and the heat exchanger 7, and at the same time it is warmed by the heat conduction from the burner case 5 and supplied to the inside of the carburetor 13, so that the local temperature drop of the carburetor 8 can be suppressed and the bad odor can be reduced. It is possible to suppress the generation of tar and tar.

The pipe mounting of the liquid fuel combustion device will be described. FIG. 3 is an enlarged view of the fuel pipe mounting portion in FIG. In FIG. 3, 5 is a burner case, 23 is a fuel pipe, and a fuel injection part 24 is provided at the tip of this fuel pipe 23. Reference numeral 29 is a partition plate that is attached to the lower portion of the burner case 5 and divides the interior of the outer case 1 into upper and lower parts, 30 is a bead portion provided by stringing or the like for attaching the fuel pipe 23 to the burner case 5, and 31 is a bead portion. This is a pipe fitting for fixing 30 to the burner case 5.

The pipe fitting 31 has a mounting plate 31A fixed to the burner case 5 with a screw and the like, and a support extending from the lower end to form an L shape from the mounting plate 31A and fixed to the partition plate 29 with a screw or the like. The mounting plate 31A is provided with a notch 32 and screw holes 33, 33, and the support plate 31B is provided with a groove 34 for holding the fuel pipe 23. Further, the fuel pipe 23 has a crank shape on the upstream side of the bead portion 30.

In the above structure, the fuel pipe 23 is inserted into the burner case 5 until the bead portion 30 hits the burner case 5, and then inserted into the notch 32 provided in the mounting plate 31A at the crank portion of the fuel pipe 23. At the same time, the bead portion 30 provided on the fuel pipe 23 is sandwiched between the mounting plate 31A and the burner case 5, and one end on the upstream side of the fuel pipe 23 is held in the groove 34 provided on the support plate 31B. As a result, the fuel pipe 23 is fixed in contact with the partition plate 29, and the screw hole 3 provided in the mounting plate 31A is fixed.
The fuel pipe is attached by screwing screws into the screws 33 and 33.

With this, the rotation of the fuel pipe 23 can be regulated and fixed, and the liquid fuel passing through the fuel pipe 23 is attached to the beat portion 30 and the pipe by heat conduction from the burner case 5 and the partition plate 29. Since it can be heated directly in a wide range through the metal fitting 31 and the temperature of the liquid fuel can be raised to a higher temperature, the local decrease in the temperature of the carburetor 13 can be suppressed, and the generation of foul odors, tar, etc. can be suppressed.

[0020]

As described above, according to the present invention, since the fuel pipe is installed on the leeward side in the ventilation chamber and is introduced into the burner case through the peripheral wall of the burner case, the liquid in the fuel pipe is The fuel is warmed by radiant heat from the hot air and heat exchanger, and at the same time it is warmed by heat conduction from the burner case and is supplied into the carburetor. Generation of tar and the like can be suppressed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a warm air heater showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a combustion device portion of the warm air heater.

FIG. 3 is an enlarged explanatory view showing a mounting state of the pipe mounting bracket.

FIG. 4 is a cross-sectional view of a conventional warm air heater.

FIG. 5 is an enlarged cross-sectional view showing a combustion device portion of the warm air heater.

[Explanation of symbols]

 1 Outer case 2 Hot air outlet 3 Vent chamber 4 Combustor 9 Blower 23 Fuel pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Sugimoto 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A box-shaped exterior case having a hot air outlet on the front surface, a ventilation chamber provided in the exterior case, a combustion device arranged in the ventilation chamber, and a room heated by the combustion device. A hot-air heater including a blower for discharging air from a hot-air outlet, and a fuel pipe for supplying liquid fuel to the combustion device is inserted into the ventilation chamber.