JPH02197760A - Fan forced heater - Google Patents

Abstract

PURPOSE:To minimize the quantity of residual unburnt gas generated during combustion shutdown and reduce odor by halting the supply of fuel during said combustion shutdown, actuating an ignition means, maintaining a faint and trace of combustion air capacity, then increasing its air capacity to a great extent. CONSTITUTION:Combustion waste gas flows upward by a combustion cylinder 3 which covers the surrounding surfaces of a burner 2, and it is mixed with an indoor air current from a convection blower 5 inside a duct 4, discharged from a blowoff port 1a, and used for heating service. During combustion shutdown, a combustion blower comes to a halt for exceptionally small time and the air capacity is increased to a great deal again when the combustion gas has been fainted. Therefore, oil supply- based cooling is eliminated and the cooling for the combustion air is minimized. As a result, the temperature of a nozzle 12 rises, which causes liquid fuel to fall in drops easily at the tip of the nozzle 12. The oil drops are dispersed and gasified spontaneously so as to increase the air capacity and produce a large quantity of air. The air is brought into contact with a burner 2 which has been heated to a high temperature by combustion heat and ignited by the heat at the burner or the manipulation of an ignition means, which accelerates the combustion and burns out the fuel including the remaining unburnt gas as well.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot-air heater used for heating by burning fuel, mixing the combustion exhaust gas with indoor air by a convection blower, and discharging it as warm air from an outlet. It is something.

2. Description of the Related Art An example of a conventional hot air heater will be described with reference to the drawings.

In FIGS. 5 and 6, a nozzle 4 that spouts liquid fuel
0 faces the inside of the vaporization cylinder 41, and combustion air flows around it through a throat 42 disposed on the side wall of the vaporization cylinder 41 to cool it. The vaporization tube 41 has a temperature above a certain temperature, vaporizes the liquid fuel ejected from the nozzle 40 on its side wall, and premixes it with combustion air.

Further, this premixed vaporized gas is guided to the burner section 43 and burned. The generated combustion exhaust gas is guided upward by the combustion tube 44 disposed so as to cover the periphery of the burner section 43, and is brought into contact with the indoor air flow from the convection blower 45 disposed behind the combustion tube 44 and into the duct 46. are mixed and discharged as hot air.

Furthermore, when combustion is stopped, the injection of fuel from the nozzle 40 immediately stops, but the combustion air and the indoor air flow from the convection blower 45 are maintained for a certain period of time until the main body is cooled to some extent.

Problems to be Solved by the Invention However, in the above-mentioned conventional configuration, when combustion is stopped, the vaporized gas becomes diluted in the process of extinguishing the flame, misfires midway, and unburned vaporized gas flows into the burner section 43 and the vaporization tube 41. It tends to remain inside. Then, the unburned vaporized gas is transferred to the burner section 4.
There was a problem that when it came into contact with high temperature parts such as No. 3, it thermally decomposed and produced a strong odor.

In addition, the nozzle 40 where the liquid fuel was being cooled stops burning, causing the temperature of the nozzle 40 to rise, and the fuel in the nozzle 40 drips into the vaporization tube 41, vaporizing it and causing a large amount of There was also the problem that unburned vaporized gas was generated, or that it did not evaporate and turned into tar.

The present invention solves these conventional problems, and aims to reduce residual unburned gas produced when combustion is stopped and reduce odor.

Means for Solving the Problems In order to solve the above problems, the hot air heater of the present invention stops the liquid fuel when combustion is stopped, simultaneously activates the ignition means, and maintains the combustion air at a weak air volume for a short period of time. rear,
This controls the amount of air to be large.

According to the above-described structure, the present invention maintains the combustion air at a weak air flow rate for a short period of time when combustion is stopped, so that the nozzle temperature becomes high and oil droplets of liquid fuel drip or easily drip onto the nozzle tip. Then, when the combustion air becomes large, it is blown away and instantly vaporizes. Then, the burner part, which has been heated to a high temperature due to combustion heat, is ignited by touching it or by operating the ignition means, and the unburned gas is burnt out in an explosive manner, thereby reducing the odor.

EXAMPLE An example of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, ``■'' is a main body case, and a burner section 2 for combustion is disposed inside the front lower part of the main body case. 3 is
This is a combustion tube that is arranged to cover the burner section 2 and guide combustion exhaust gas upward. Reference numeral 4 denotes a duct that covers the combustion tube 3 and mixes the indoor air flow from the convection blower 5 with the above-mentioned combustion exhaust gas and discharges the mixture as warm air. 6 is the burner section 2
This is a fixed tank disposed on the 0 side and holding liquid fuel that is sucked up and supplied by a pump 7 and combusted, and a removable cartridge tank 8 is disposed above the fixed tank. Further, in FIG. 3, 11 vaporizes liquid fuel jetted from a nozzle 12, premixes it with combustion air sent from a combustion blower (not shown) through a throat 13, and sends it to the burner section 2. It is a vaporizer cylinder. 14 is the flame hole 2a of the burner 2
The ignition means is arranged opposite to the ignition means.

In the above configuration, liquid fuel is supplied from the cartridge tank 8 to the fixed tank 6 so as to maintain a constant oil level, and is sucked up from the fixed tank 6 by the pump 7. Then, it is ejected into a vaporizing cylinder 11 formed by a nozzle 12 and heated to a high temperature above a certain temperature, and is vaporized. This vaporized gas is mixed with combustion air sent from the throat 13 and sent to the burner section 2 as a premixed vaporized gas, where it is ignited and burned by the ignition means 14. The generated combustion exhaust gas then covers the surroundings of the burner section 2 (
The air flows upward through the disposed combustion tube 3, mixes with the indoor air flow from the convection blower 5 in the duct 4, and is ejected as warm air from the outlet 1a to be used for heating.

Next, the control circuit will be explained using FIG. 4. When the operation switch 15 is closed, the first relay 16 is energized and the contacts 17, 18, 19, and 20 are closed. When contact 17 closes, the third relay 21 is energized, contact 22 closes, and contact 1
The contact 22 is held regardless of whether the switch 7 is opened or closed, and at the same time, the heater 23 and the temperature limit switch 24 are energized so that the temperature of the vaporizer cylinder 11 is higher than a certain temperature. The temperature limit switch 24 is configured to energize the heater 23 when the temperature of the vaporizing cylinder 11 is lower than a certain certain level, and to energize the fourth relay 25 when the temperature is higher than a certain certain level. The temperature of the vaporizer cylinder 1 becomes high, and the 4th relay 2
When the contact 26 is energized, the 5th relay 27 is energized, the 2nd contact is closed, and the 2nd contact is maintained regardless of whether the contact 26 is open or closed. The second timer 29 and the ignition means 14 are connected through the contacts 18 and 30, the combustion air a31 is connected through the contacts 19, and the fifth timer 3 is connected through the contacts 20.
2, and then to the convection blower 5. When the time set by the second timer 29 (for example, 30 seconds) has elapsed, the contacts 30 of the ignition means 14 are opened and the energization is stopped. Further, the pump 7 is energized by closing the contact 33 with a slight delay (for example, 10 seconds) after the contact 28 is closed by the fifth timer 32. Therefore, combustion air from the combustion blower 31 and, with a slight delay, liquid fuel from the pump 7 are supplied into the vaporization cylinder 11, which is heated to a certain temperature or higher, and are vaporized. Then, the premixed vaporized gas is ignited by the ignition means 14 to start combustion, and the generated combustion exhaust gas is discharged as hot air by the convection blower 8g5 and used for heating.

Next, when the operation switch 15 is turned off, the first relay 16 is disconnected and contacts 17.1B and 19.20 are opened, and the pump 7 is de-energized and combustion is stopped. Further, the ignition means 14 is energized again via the contact 35 by energizing the third timer 34 side when the contact 18 is opened, and when the time set by the third timer 34 (for example, 30 seconds) has elapsed, the contact 35 is opened and energized. stops. Further, the combustion blower 31 has a contact point 19
is opened and the fourth timer 36 side is energized, and when the fourth timer 36 has elapsed for a short time (for example, one second), the contact 37 is closed and the energization is delayed. Also, operation switch 1
5, the first timer 38 is energized and the first
The timer 38 opens the contact 39 when the equipment has almost cooled down (for example, 2 minutes), and the heater 23 and the convection blower 5. The combustion blower 31 is de-energized. Therefore, when the operation switch 15 is turned off, the pump 7 is also turned off and combustion stops, but the ignition means 14 is re-energized for a certain period of time, the combustion blower 31 is re-energized after a short period of time, and the convection blower [ It is delayed and expires with 5.

With the above-described configuration, the combustion blower 31 is stopped for a short time when combustion is stopped, and the combustion air becomes weak and then becomes large again. Therefore, cooling by oil supply is eliminated, and cooling of the combustion air is also reduced, the temperature of the nozzle 12 rises and becomes high, and oil droplets of liquid fuel tend to drip onto the tip of the nozzle 12. The oil droplets are then blown away and instantaneously vaporized as the combustion air is again increased in volume. Then, it ignites by touching the burner part 2, which has been heated to a high temperature due to combustion heat, or by operating the ignition means, and combusts explosively, burning out all the remaining unburned gas.

Therefore, almost no unburned gas is generated, reducing odor, and the oil droplets that tend to form at the tip of the nozzle are forcibly blown away and burned, eliminating the foul odor caused by the dripping of oil droplets and the formation of tar. can also be suppressed.

Effects of the Invention As described above, according to the present invention, it is possible to burn out residual unburned gas during fire extinguishing, reduce odor, and also eliminate dripping odor and cool generation due to oil dripping from nozzles, which were caused by variations. It can be suppressed, and the effect is great.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a warm air heater according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the whole, Fig. 3 is a cross-sectional view of the main parts, Fig. 4 is a front view of the same, and Fig. 5 6 is an overall cross-sectional view of a conventional hot-air heater, and FIG. 6 is a cross-sectional view of essential parts thereof. 2... Burner section, 3... Combustion tube, 4.
...Duct, 11...Carbonizer, 12...
... Nozzle, 13 ... Throat, 14 ...
...Ignition means, 15...Operation switch, 1
6...1st relay, 29...2nd timer, 36...4th timer agent's name Patent attorney Shigetaka Awano Haka1 person-'-1 Mi Aoi Figure Figure Figure

Claims (2)

[Claims] (1) A nozzle that spouts liquid fuel, an air supply port that forms a passage that supplies combustion air around the nozzle, and a vaporization cylinder that vaporizes the supplied liquid fuel and premixes it with combustion air; A burner section that ignites and burns the premixed vaporized gas produced by an ignition means, a combustion tube that covers the burner section and guides the combustion exhaust gas upward, a combustion tube that covers the combustion tube and guides the combustion exhaust gas upward, and a combustion tube that covers the combustion tube and guides the combustion exhaust gas upward. The duct is equipped with a duct that mixes the indoor air flow from a convection blower installed at the rear with the combustion exhaust gas to create warm air. After holding, the hot air heater becomes as large air volume. (2) The warm air heater according to claim (1), wherein the ignition means is activated at the same time as the liquid fuel is stopped when the fire is extinguished, and the combustion air is maintained at a weak air volume for a short period of time, and then the air volume is increased to a large air volume.