JPH03225110A - Vaporization type combustion equipment - Google Patents

Abstract

PURPOSE:To improve the easiness of flame transfer at the time of starting strong combustion by reducing the revolution of a fan for convection flow of air at the time of flame transfer from a sub-burner to a main burner or stopping the fan temporarily. CONSTITUTION:A main burner 7 for intermittent combustion and a sub-burner 8 for intermittent combustion are provided in parallel with a distance between them, and at the same time flame transfer is made possible by tilting the flame ports 9 and 10 of the burners a little inward. And at the time of flame transfer from the sub-burner 8 to the main burner 7, a control circuit 32 either reduces the rotation of the motor 39 of a fan for convection flow of air or stops temporarily the fan for convection flow of air. With this arrangement the force of draft in the combustion chamber is weakened, and unburned gas from the main burner 7 stays near the flame port 9 of the burner, and flame is transferred to this unburned gas rapidly and at the same time the unburned gas is burned by the combustion flame of the sub-burner 8.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention supplies liquid fuel to a vaporizer, vaporizes the liquid fuel in the vaporizer, and directs the vaporized gas through a nozzle to a burner. The present invention relates to vaporizing combustion appliances such as oil fan heaters, forced air supply and exhaust type oil hot air heaters, etc., which are supplied to the room for combustion, and the combustion gas is supplied indoors as air by the operation of a convection fan.

(Prior Art) In this type of conventional vaporization type combustion appliance, a nozzle is provided in communication with the end of a vaporizer having a vaporization heater, and the vaporization heater preheats the vaporizer to a predetermined vaporization temperature. After reaching the temperature, the electromagnetic pump is driven, and the liquid fuel in the fuel reservoir is sequentially supplied to the vaporizer.The supplied liquid fuel is vaporized by the heat of the vaporization heater, and the vaporized gas is passed from the nozzle together with the combustion air. It is guided to a burner and combusted, and the combustion gas is supplied indoors as warm air by the operation of a convection fan, and the amount of combustion is increased or decreased by adjusting the amount of liquid fuel sent from an electromagnetic pump. Was.

(Problem to be Solved by the Invention) In the above conventional technology, the combustion amount is adjusted by adjusting the amount of liquid fuel supplied, but if the combustion amount is extremely reduced, vaporized gas is ejected from the nozzle. The speed decreases and the fuel supply at the burner nozzle no longer follows the combustion speed, resulting in a so-called flashback phenomenon. As described above, in the conventional technology, there is a limit to the reduction in the amount of combustion, so when it is relatively warm, such as in early spring, there is a problem that even with the minimum amount of combustion, the room becomes too hot.

One way to solve these problems is to connect a pair of nozzles to a vaporizer, provide a burner corresponding to each nozzle, and provide the burner flame openings so that they can be tilted inward to allow flame transfer. , it is proposed that strong combustion is achieved by firing both burners, and weak combustion is achieved by compacting one of the burners, greatly reducing the amount of combustion.
At the start of strong combustion, that is, at the start of combustion, one burner is ignited and the combustion flame of this burner is transferred to the other burner for strong combustion, or in a weak combustion state, the combustion flame of the burning burner is transferred to the other burner. When the flame transfers to a burner and the transition to strong combustion occurs, the gas ejected from the flame port of the burner on the side where the flame transfers occurs does not ignite until it comes into contact with the combustion flame of the other burner, which increases the ignition time. There was a concern that by the time ignition occurred, unburnt gas would be discharged into the room by the draft force generated by the operation of the convection fan, creating an odor.

The present invention solves the above problems, expands the variable range of thermal power, and improves the flame transferability at the start of strong combustion! ! l! The purpose is to make all baking utensils.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a main burner 7 for intermittent combustion and a sub-burner 8 for continuous combustion in parallel at intervals, and
These burner flame openings 9 and 10 are slightly inclined inward to allow fire to transfer, and when the flame transfers from the sub-burner 8 to the main burner 7, the number of revolutions of the convection blower fan is reduced or the convection blower fan is installed. A control means 32 is provided for temporarily stopping the operation.

(Function) With the above configuration, sub-burner 8 is activated at the start of strong combustion.
When transferring the combustion flame F to the main burner 7, the rotation of the convection blower fan decreases or the convection blower fan temporarily stops, weakening the draft force inside the combustion chamber. The unburned gas from burner 7 is that birch flame port 8I! The remaining unburned gas accumulates near 9 and quickly ignites this accumulated unburned gas, and the unburned gas is combusted by the combustion flame F of the sub-burner 8.

(Example) Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 6 show an embodiment of the present invention, in which numeral 1 denotes a liquid fuel storage section, and this liquid fuel storage section 1
An electromagnetic pump 2 is fixed to the electromagnetic pump 2-, and a vaporizer 4 is connected to the electromagnetic pump 2- via an oil feed vibrator 3. This vaporizer 4 has a cylindrical aluminum die-cast or brass base 4A provided with a vaporization heater 5 such as a sheathed heater, and a thermistor 6 for detecting the vaporization temperature.

The carburetor 4 is provided on one side between a pair of main burners 7 for intermittent combustion and sub-burners 8 for continuous combustion, which are arranged in parallel at intervals, and are perpendicular to the burners 7.8.

The burner mouth portions 9.10 provided on each of the pair of burners 7.8 are inclined inwardly so as to be directed slightly upwardly toward the inside of each other, and furthermore, both burners 7.8
In between, a flat plate-shaped heat recovery body 11 made of a material with good thermal conductivity such as aluminum or brass is integrally installed above the upper part of the base body 4A of the vaporizer 4, and the upper part of this heat recovery body 11 is connected to both sides. It is provided slightly above the burner mouth part 9.10 of the burner.

12 is a nozzle on the main burner 7 side, and this nozzle 1
2 is provided perpendicularly to the vaporizer 4 at the upper part of the base 4A of the vaporization chamber 4B formed in the vaporizer 4, and a spout 13 is provided at the tip thereof. Reference numeral 14 denotes a needle shaft that is provided so as to be able to move forward and backward within the nozzle 12 by turning on and off power to the solenoid 15. Reference numeral 16 designates a nozzle of the sub-burner 8 having a spout 17 at its tip. A needle shaft 20 is provided that moves forward and backward depending on whether the power is turned on or off. Also, on the opposite side of the nozzle 16 is a return port 2.
A fuel return path 21A connected to the liquid fuel storage section 1 is connected to the return port 21. During combustion, the jet port 17 is opened and the return port 21 is closed, and during extinguishing, the jet port 21 is closed. The outlet 17 is closed and the return port 21 is opened. The other end of the first communicating path 22, which has one end connected to the tip 18 of the vaporization chamber 4B, is connected to the nozzle 1 on the sub-burner 8 side.
6, and the other end of the second communication path 23 whose one end is connected to the nozzle 16 is connected to the nozzle 12 on the main burner 7 side, and these nozzles 12.16 are connected to the first and second communication paths. It is always connected in series with the vaporization chamber 4B via 22 and 23. Reference numeral 24 denotes a burner throat portion of the main burner 7, and the opening portion 25 of this burner throat portion 24 is spaced apart from and opposed to the spout 13.
Primary air for combustion is sucked in by the vaporized gas ejected from the main burner 7, and the two are mixed and combusted at the burner flame port 9 of the main burner 7. Reference numeral 26 denotes a burner throat section of the sub-burner 8, and the opening section 27 of the burner throat section 26 is arranged to face the ejection port 17 at a distance, so that the vaporized gas and the primary air are mixed and the burner throat section 1
0, and the burner flame opening 1
An ignition heater 28 and a flame sensor 29 are provided near zero. Incidentally, the spout 13 on the side of the main burner 7
The opening area is larger than the opening area of the jet nozzle 17 on the sub-burner 8 side, and the opening area of the burner flame mouth part 9 and the burner throat part 24 on the main burner 7 side is larger than the opening area of the ejection port 17 on the sub-burner 8 side.
The opening area of the side burner flame port 10 and the burner throat 26 is made larger, so that the combustion amount of the main burner 7 can be made larger than the combustion amount of the sub-burner 8. A burner mouth part 9 of the main burner 7 is provided in a range where the flame can be transferred from the main burner 10.

FIG. 4 is a circuit diagram showing the electrical configuration of the evaporative combustion appliance, in which an ignition heater 28, a evaporative heater 5, and a triac 30 that changes the energization cycle of the evaporative heater 5 are connected in series to an AC power source E. . In this case, the voltage distribution of the ignition heater 28 is set to about 5V. A series circuit of a capacitor CI and a resistor R1 is connected in parallel to the triac 30, and a photothyristor 31A of a photocoupler 31 is connected between the terminal and gate of the triac 30 via a resistor R2. A control circuit 32 is a control means for a load such as a convection fan, and controls the load by inputting various information from the thermistor 6, flame sensor 29, operation switch 33, etc., and closes the switch 34 together with the operation switch 33. When this occurs, the light emitting diode 31B is activated by a signal from the -Jm circuit 32.

The ignition of the triac 30 is controlled via the photothyristor 31A, and the vaporization heater 5 is
is energized. When the thermistor 6 detects that the vaporizer 4 has reached the temperature at which liquid fuel can be vaporized, the relay 35
is energized to open a normally open short circuit relay contact 35A connected in parallel to the ignition heater 28 and energize the ignition heater 28, and at the same time, the relay 36 is energized and a normally open relay contact 36A is closed. The solenoid 19 on the sub-burner 8 side is energized via the rectifier circuit 37, and the electromagnetic pump 2 is also operated.

Further, when the flame sensor 29 detects the ignition of the sub-burner 8, the relay 38 is energized and the normally open relay contact 38 is activated.
A is closed, and the convection fan motor 39 rotates at high speed for a certain period of time, ff1t+for example, for 5 seconds. In this case, a triac 40 that changes the energization period is connected in series to the convection fan motor 39, and a series circuit of a capacitor C2 and a resistor R3 is connected in parallel to the triac 40, and the terminal of the triac 40 and the gate A photothyristor 41A of the photocoupler 41 is connected between the resistor R4 and the triac 40, which is ignited by a signal from the control circuit 32 via the light emitting diode 41B1 and the photothyristor 41A. The number of rotations of the convection fan motor 39 can be increased from 150 rpm to 1180 rpm in the energization period. After time t1 has elapsed, the relay 42 is energized, the normally open relay contact 42A is opened, the solenoid 15 on the main burner 7 side is energized via the rectifier circuit 37A, and the convection fan motor 39 is activated for a certain period of time t2 after ignition. For example, the sub-burner 8 is controlled to rotate at a low speed or to stop until one minute has elapsed, and the combustion flame F of the sub-burner 8 is transferred to the main burner 7, and strong twist firing is started.

Next, the operation of the above structure will be explained with reference to FIGS. 5 and 6.

First, when the operation switch 33 is turned on to start operation, the vaporization heater 5 is energized and heating of the vaporizer 4 is started (step 2). Then, the temperature of the vaporizer 4 is detected by the thermistor 6, and when it is detected that the vaporizer 4 has reached a predetermined temperature at which liquid fuel (not shown) can be vaporized, step 3) 1 starts the ignition operation of the sub-burner 8. As soon as the process is completed (step 4), a time count is started (step 5). In order to ignite the sub-burner 8, the electromagnetic pump 2 and the solenoid 19 on the sub-burner 8 side are activated, and the ignition heater 28 is energized. The liquid fuel is then sucked into the electromagnetic pump 2 and supplied to the vaporizer 4. The liquid fuel is heated and vaporized in the vaporizer 4, and the vaporized gas passes through the first communication path 22 as shown by the arrow in FIG. is supplied to the nozzle 16 on the sub-burner 8 side, and further passes through the second communication path 23 to the sub-burner 811! It reaches the nozzle 12 of I.

Then, the vaporized gas passes through the nozzle 16 in which the needle shaft 20 on the sub-burner 8 side is retracted by the solenoid 19, and is ejected from the ejection port 11 to the burner throat portion 26. At the same time, the momentum of this vaporized gas draws combustion air into the burner throat section 26, and the mixed gas mixed with this combustion air flows into the burner flame port 10 of the sub-burner 8.
This is ignited by the ignition heater 28 and combustion begins in the sub-burner 8. Next, it is determined whether the flame current detected by the flame sensor 29 has reached 10μ8 or more (step 6), and in step 7 it is determined that this condition is not satisfied by the time t3 elapses from the time count. Extinguish the fire if it occurs (Step 8)
). When the conditions of step 6 are satisfied and the ignition is stabilized, the ignition heater 28 is cut off, and the convection fan motor 39
rotates at high speed for startup compensation (step 9).

At this time, the room temperature is low and the control signal is output from the control circuit 32 so that the combustion state is strong twist firing, so a time count is started (step 10), and after the time count has elapsed, for example, 5 seconds (step 11, start the flame transfer operation to the main burner 7 (step 12)
. This is because the needle shaft 14 is moved back by the solenoid 15 on the main burner 7 side and the nozzle 12 is opened, and the convection fan motor 39 either rotates at a low speed of about 850 rpm (1 minute) or temporarily stops (5 minutes). seconds)
This reduces draft forces in the combustion chamber (not shown). In this state, the mixed gas in the carburetor 4 is ejected from the ejection port 13, and the mixed gas ejected from the burner flame port 9 accumulates near the burner flame port 9, causing the combustion flame F of the sub-burner 8 to When the flame transfers, it ignites and starts combustion, resulting in a highly twisted firing state. Thereafter, after a time t2 from the time count, for example, 1 minute in the case of low speed rotation (step 13), the convection fan motor 39 is set to high speed operation (step 14). By adjusting the amount of liquid fuel sent from the electromagnetic pump 2, it is possible to adjust the amount of combustion of both burners 7, 8 in a strong twist firing state.

Next, the room temperature rises and this is detected by a room temperature sensor (not shown).
is detected or set to weak combustion, a signal is output from the ilJ m circuit 32 to change the combustion state to a combustion state below the minimum combustion amount in the strong twist firing state, and this causes the relay contact 4 to
2A is opened, the solenoid 15 is de-energized, the needle shaft 14 on the main burner 7 side closes the ejection port 13, the ejection of vaporized gas from the ejection port 13 is stopped, and the main burner 7 is extinguished. Therefore, only the sub-burner 8 continues to be in a combustion state, resulting in a weak combustion state. By adjusting the amount of liquid fuel sent by the electromagnetic pump 2, the combustion amount can be adjusted while the sub-burner 8 is in a weak combustion state. Also, when the flame transfers from the sub-burner 8 to the main burner 7 when transitioning from the weak combustion state to the strong twist firing state, the solenoid 15 on the main burner 7 side is activated as shown in steps 12 to 14 in FIG. While energizing, the convection fan motor 39 is rotated at a low speed or temporarily stopped. Furthermore, when the operation switch 33 is operated to extinguish the fire during weak combustion, the ejection port 17 on the side of the sub-burner 8 is closed, thereby causing the extinguishing state.At the same time, the fuel return port 21 is opened and the fuel in the carburetor 4 is discharged through the fuel return path 21A. It is designed to reach the liquid fuel storage section 1.

In this way, in the above embodiment, the main burner 7 for intermittent combustion and the sub-burner 8 for continuous combustion are provided in parallel at intervals, and the flame openings 9 and 10 of these burners are tilted slightly inward to prevent flame transfer. The sub-burner 8
By providing a control circuit 32 as a control means for reducing the rotation speed of the convection fan motor 39 or temporarily stopping the convection fan motor 39 when the flame transfers from the flame to the main burner 7, combustion can be started. At times, when the sub-burner 8 is ignited and the combustion flame F of this sub-burner 8 is transferred to the main burner 7 for strong twist firing,
Alternatively, in a weak combustion state where only the sub-burner 8 burns, when the combustion flame F of the sub-burner 8 is transferred to the main burner 7 to shift to strong twist firing, the convection fan rotates at a low speed or temporarily stops, As a result, the draft force in the combustion chamber is weakened, and unburnt gas from the main burner 7 at the time of flame transfer accumulates near the burner flame opening 9.
The combustion flame F of the sub-burner 8 quickly transfers to this accumulated unburned gas and ignites it, and the unburned gas is combusted by this combustion flame F. In this way, stable fire transfer operation is possible, and the odor caused by unburned gas can be reduced, and even after the main parf ignition, the convection fan can be kept running at low speed or temporarily stopped. In order to continue the combustion for a certain period of time, the air flow in the main burner 7 can be reduced to stabilize the state of the combustion flame F.

Furthermore, in this embodiment, since the sub-burner 8, which is smaller than the main burner 7, is first ignited at the start of combustion, a small amount of unburned gas flows out from the sub-burner 8 from the opening of the jet nozzle 17 until the ignition. Yes, it is possible to suppress the generation of odor at the start of combustion.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, the combustion amount of the main burner and the sub-burner may be made similar, and the time filt+, t2, or the rotation speed of the convection fan may be set arbitrarily. Various modifications are possible, such as selection.

[Effects of the Invention] The present invention supplies liquid fuel to a vaporizer, vaporizes the liquid fuel in the vaporizer, supplies this vaporized gas to a burner through a nozzle to burn it, and uses the combustion gas as a convection blower. In evaporative combustion appliances that supply warm air indoors through the operation of a fan, a main burner for intermittent combustion and a sub-burner for continuous combustion are installed in parallel at intervals, and the flame openings of these burners are tilted slightly inward. and set it so that it can catch fire.
A control means is provided to reduce the rotational speed of the convection blower fan or temporarily stop the convection blower fan when the flame transfers from the sub-burner to the main burner. It is possible to provide a vaporizing combustion appliance with improved flame transfer properties at the start of combustion.

[Brief explanation of drawings]

Figures 1 to 6 show an embodiment of the present invention, with Figure 1 being a perspective view, Figure 2 being a partially cutaway plan view, and Figure 3 showing the relationship among the main burner, sub-burner, and carburetor. A sectional view showing,
FIG. 4 is a circuit diagram, FIG. 5 is an operation explanatory diagram, and FIG. 6 is a flow chart. 4... Carburizer 7... Main burner 8... Sub-burner 9.10... Burner flame opening 12, 16... Nozzle 32... Control circuit (IJI11 means) 39... For convection Blower fan motor patent application filed by agent of Toshiba Heating Equipment Co., Ltd.

Claims (1)

[Claims] Liquid fuel is supplied to a vaporizer, which vaporizes the liquid fuel, and this vaporized gas is supplied to a burner through a nozzle to be combusted, and the combustion gas is sent indoors as warm air by the operation of a convection fan. In vaporizing combustion equipment that supplies
A main burner for intermittent combustion and a sub-burner for continuous combustion are provided in parallel at intervals, and the flame openings of these burners are slightly inclined inward so that the flame can transfer, so that the flame can be transferred from the sub-burner to the main burner. A vaporizing combustion appliance characterized in that a control means is provided for reducing the rotational speed of the convection blower fan or temporarily stopping the convection blower fan at the time of transfer.