JP2737037B2 - Liquid combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid combustion device for burning kerosene, which is used for a heater or a water heater.

[0002]

2. Description of the Related Art Heretofore, as a liquid combustion apparatus for burning liquid fuel, a gun type liquid combustion apparatus for supplying fuel sprayed from a nozzle in a mist state and air pumped by a fan into a combustion chamber for combustion. And a liquid combustion device called a gun pot that injects fuel from a nozzle into a combustion chamber inside a bottomed cylinder in which a large number of supply holes for combustion air are provided in multiple stages on a peripheral wall, and a combustion air on a peripheral wall. 2. Description of the Related Art There is known a pot burner in which fuel flows into a combustion chamber inside a bottomed cylinder provided with a large number of supply holes in a multistage, and the fuel is evaporated and burned in the combustion chamber.

[0003]

However, in the gun type liquid combustion apparatus, the amount of combustion per unit time can be changed by changing the pressure of the fuel supplied to the nozzle. ) Is relatively small (1: 2)
When using a burner with a small amount of combustion, it takes time to raise the temperature of the load to the set temperature.Using a burner with a large amount of combustion eliminates such problems. There is a problem that it is difficult to perform fine temperature control, and in order to improve this,
As disclosed in Japanese Patent No. 7212, a combination of a nozzle with a bypass and a fuel return circuit is also known, but this has a problem that its structure becomes complicated.

[0004] Further, the gun type burner has large combustion noise and ignition noise and is not particularly suitable as a combustion device used in general households.

[0005] Therefore, the above-mentioned gun-pot type liquid combustion apparatus has been developed.

However, even a gun pot type liquid combustion apparatus has a relatively small combustion variable width (TDR).

In the pot burner, there is a problem that the larger the amount of combustion per unit time, the larger the size.

[0008] It is an object of the present invention to provide a liquid combustion apparatus that eliminates such disadvantages.

[0009]

For <br/> invention described in claim 1 of the present patent application [SUMMARY OF] is to achieve the above object, a combustion chamber inside is provided a plurality of supply holes for combustion air to the peripheral wall in multiple stages An air chamber surrounding the bottomed cylindrical body is provided, a variable air volume blowing fan for supplying combustion air is connected to the air chamber, and a fuel injection nozzle and a fuel for supplying fuel to the combustion chamber are provided. An outlet, and a first on-off valve is interposed in a first fuel passage connected to the injection nozzle, and a second on-off valve is interposed in a second fuel passage connected to the fuel outlet. Each fuel injection nozzle and a fuel outlet are connected to the discharge side of a common variable fuel pump via a second fuel passage, and the second on-off valve is variable.
When the discharge amount or discharge pressure of the type fuel pump is below a certain value
Open, close when the discharge amount or discharge pressure exceeds a certain value, open first
When the valve is closed, the discharge amount or discharge pressure of the
2 When the on-off valve reaches a certain value that closes,
It is characterized by having .

[0010]

In the liquid combustion apparatus according to the first aspect having the above structure, one of the first on-off valve and the second on-off valve is opened,
The fuel is supplied to the combustion chamber to ignite and burn. When the room temperature is extremely low, the discharge capacity of the variable fuel pump is increased, and the fuel is discharged from the injection nozzle and burned. As the room temperature increases, the discharge amount of the fuel pump gradually decreases and the discharge amount or When the discharge pressure decreases and the spray pattern of the fuel ejected from the injection nozzle cannot maintain a constant pattern, the state is switched to a state in which fuel is supplied from the fuel outlet. When thus flows out to the combustion chamber from the fuel outlet, combustion chamber switched to the combustion state of fuel burning while evaporated, a relatively small amount of fuel is supplied Oneゝcombusted thereby it is possible.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the attached drawings.

In the drawing, reference numeral 1 denotes a supply hole 1a for combustion air in a peripheral wall.
Combustion chamber provided in a bottomed cylinder 2 provided with a large number of
Is an air chamber provided around the combustion chamber 2 so as to surround it;
Reference numeral 4 denotes a variable-flow-type blowing fan for supplying combustion air to the air chamber 3. The bottomed cylindrical body 2 has a bottom portion formed of an inner cylinder 2a and an outer cylinder 2b, and a peripheral surface of the outer cylinder 2b. The fuel injection nozzle 5 and the fuel supply pipe 7 are attached to the holding cylinder 6.
Is inserted and attached, and the inner cylinder 2a
The fuel injection nozzle 5 faces the outside of the first opening 9 provided in the inner cylinder 2a, and the tip end of the fuel supply pipe 7 is inserted into the second opening 10 facing the bottom of the inner cylinder 2a. A first opening / closing valve 13 and a second opening / closing valve 14 are interposed between a first fuel passage 11 connected to the fuel supply pipe 7 and a second fuel passage 12 connected to the fuel supply pipe 7, and the first fuel passage 11 and the second fuel passage 12 are connected to each other. The fuel in a fuel tank (not shown) is supplied to the combustion chamber 2 from the outlet 16 or the injection nozzle 5 at the tip of the fuel supply pipe 7 by a common variable pressure fuel pump 15.

[0013] Incidentally, the fuel pump 15 in this embodiment, so as to vary the discharge amount by the electromagnetic plunger type performs amplitude modulation or frequency modulation of the coil power source, switching of the discharge amount, setting temperature and room temperature This is performed stepwise or steplessly according to the difference from a sensor (not shown).

The first on-off valve 13 and the second on-off valve 14
Is configured to be an electromagnetic opening and closing type, and for example, the second opening and closing valve 14
The discharge rate of the fuel pump 15 is from 0, 4 liters / hour to 1
The first on-off valve 13 is set so as to be opened at a rate of 1 liter / hour or less and closed at a rate of 1 liter / hour or less.

The blower fan 4 is capable of changing its blower amount in accordance with the discharge amount of the fuel pump 15, and the blower shown in FIG.

Reference numeral 17 denotes a pair of ignition electrodes supported by the holding cylinder 6 and facing the front surface of the injection nozzle 5.

Reference numeral 18a denotes a temperature sensor such as a thermistor facing the bottomed cylindrical body 2, 18b denotes a flame detection sensor such as a flame rod for detecting combustion in the combustion chamber 2, 19 denotes a constant level device, and a tank. The fuel supplied from 20 to the leveling unit 19 is pumped up by the fuel pump 15.

[0018] 21 support base, 22 denotes an outer frame which supports the bottomed tubular body 2 which is supported on the support base 21, the support base 21
A duct 23 for connecting the blower fan 4 and the air chamber was provided therein.

Next, a case where the operation of the present liquid combustion apparatus is used for a heater will be described with reference to an operation pattern diagram shown in FIG.

When the operation switch is turned on, an ignition transformer (not shown) operates. Thereafter, the fuel pump 15 is operated and the first on-off valve 13 is opened, and the fuel is ejected from the injection nozzle 5 and ignited by a spark generated between the ignition electrodes 17. At this time, the blower fan 4 supplies a strong air volume. When the flame is detected by the flame rod 18b provided on the bottomed cylinder 2 by the combustion, the ignition transformer is energized, and a combustion state corresponding to a temperature detected by a room temperature detector (not shown) is established.

To explain this, when the difference between the room temperature and the set temperature is large , the fuel pump 15 outputs the maximum discharge amount of 2
Liters / hour and the first on-off valve 13
, And the maximum fuel is injected from the fuel injection nozzle 5 to continue combustion. Therefore, the room temperature can be quickly raised.

[0022] Then been One to increase the room temperature, fuel pump 15 accordingly when changing the difference between the room and the set temperature
To reduce the discharge amount. When the difference between the room temperature and the set temperature is reduced and the discharge amount of the fuel pump 15 is further reduced, the spray pattern sprayed from the fuel injection nozzle 5 is broken and the state becomes close to a state where normal combustion cannot be maintained. Supply pipe 7
Is switched to a state in which fuel is supplied from the fuel outlet 16 to the combustion chamber 2. At this time, the blower fan 4 is in a weak state.

When the fuel supplied from the fuel outlet 16 ignites and starts burning, the first on-off valve 13 is closed. As a result, the state is switched to a state in which the fuel evaporates and burns in the combustion chamber 1. When the room temperature and the difference between the discharge amount is further lowered to room temperature and the set temperature of the One being the fuel pump 15 difference is reduced between the set temperature is eliminated, the discharge pressure of the fuel pump 15 is supplied with the minimum fuel becomes minimum State.
When this state continues and the room temperature becomes lower than the set temperature, the fuel pump 15 is operated in accordance with the difference between the room temperature and the set temperature as described above.
Is determined. That is, it is possible to determine the temperature precisely by repeating the gradual temperature increase and the temperature decrease approaching the set temperature.

When the room temperature drops rapidly and the difference between the room temperature and the set temperature increases, the second on-off valve 14 closes and the first on-off valve 13 opens, causing fuel to be ejected from the fuel injection nozzle 5 and combustion. And raise the temperature immediately.

The first on-off valve 13 and the second on-off valve 14 are
A valve that opens in accordance with the discharge pressure of the fuel pump 15 may be used.

To explain this, for example, the second on-off valve 14
This means that when the discharge pressure of the pump 15 is 0, 4 liters / hour or more, the first opening / closing valve 13 is set to the discharge pressure corresponding to the discharge rate of 1 liter / hour. It is a pressure-responsive valve that opens when it is closed and closes when it is less. When the second opening / closing valve 14 is turned off, the discharge rate at which the first opening / closing valve 13 opens becomes 0, 99 l / h or more.
Neither closed, fuel from the fuel injection nozzle 5 and a fuel outlet port 16
Since the supply of remains or the second fuel passage 12 needs to be arranged an electromagnetic valve to close when the discharge amount was 1 liter / hr.

The above embodiment has been described with respect to the embodiment in which the fuel is supplied from the injection nozzle 5 and the fuel is ignited. In this embodiment, quick ignition can be performed,
On the other hand, there is a problem that the ignition sound becomes loud. If it is desired to reduce the ignition sound, fuel may be supplied from the outlet 16 and ignited by the separately provided ignition heater 24.

In this case, the temperature sensor 18a
, The normal combustion in which the combustion according to the temperature detected by the room temperature detector (not shown) is performed from the initial combustion state.

[0029]

According to the liquid combustion apparatus of the first aspect having the above-described structure, there are a state in which fuel is burned while injecting fuel from the fuel injection nozzle, and a state in which fuel is burned while being injected from the fuel outlet. Two combustion states can be created. By combining these two combustion states, a combustor with a large combustion variable width can be obtained, and when there is a temperature difference between the load temperature and the set temperature, the combustion is performed. By increasing the amount, the temperature of the load can be quickly brought close to the set temperature, and when approaching the set temperature, the amount of combustion can be reduced to gradually approach the set temperature, and the load temperature can be reduced. Easy to approach set temperature. And the two combustion states
The switching to create the first fuel connected to the injection nozzle
A first on-off valve in the fuel passage, and a second fuel passage connected to the fuel outlet.
Switching with the second on-off valve interposed in the road,
The second on-off valve is provided for the discharge amount or discharge pressure of the variable fuel pump.
Opens when the pressure is below a certain value, and the discharge amount or discharge pressure is constant
The valve is closed and the first on-off valve is closed to the discharge amount of the variable fuel pump.
Or the discharge pressure reaches a certain value at which the second on-off valve closes.
When switching, the switching is easily and reliably performed.
I can.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part.

FIG. 3 shows the II-II line

FIG. 4 is an operation pattern diagram.

[Explanation of symbols]

1 combustion chamber 1a supply hole 2
Bottomed cylinder 3 air chamber 4 blower fan 5
Fuel injection nozzle 11 First fuel passage 12 Second fuel passage 1
3 First on-off valve 14 Second on-off valve 15 Fuel pump

Claims (1)

(57) [Claims] 1. An air chamber surrounding a bottomed cylindrical body having a multiplicity of combustion air supply holes formed in a peripheral wall and having an internal combustion chamber, and supplying combustion air to the air chamber. A variable air flow type blower fan is connected, and a fuel injection nozzle for supplying fuel to the combustion chamber and a fuel outlet are arranged side by side, and a first opening / closing valve is interposed in a first fuel passage connected to the injection nozzle,
A second opening / closing valve is interposed in a second fuel passage connected to the fuel outlet, and each fuel injection nozzle and the fuel outlet are discharged by a common variable fuel pump through the first fuel passage and the second fuel passage. Side, and the second on-off valve is connected to the discharge port of the variable fuel pump.
Open when the output amount or discharge pressure is below a certain value,
Is closed when the discharge pressure exceeds a certain value, and the first on-off valve is a variable fuel
The discharge amount or discharge pressure of the pump causes the second on-off valve to close
It is opened when it reaches a certain value or more.
That the liquid combustion apparatus.