JPH07293864A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To reduce odor at the time of fire extinguishing by so providing a control circuit for controlling at least one of fuel supply means and a combustion blower that the reducing ratios of a liquid fuel supply quantity and combustion air supply quantity are equalized at the time of the fire extinguishing. CONSTITUTION:When a drive power source of a combustion blower 24 is AC, a driving circuit is switched in a control circuit 25 to half-wave or full-wave rectify the AC and the blower 24 is braked to reduce an air flow quantity. The flow rate of the combustion air of this case becomes zero in a short time. Accordingly, the combustion air becomes substantially equal to the reducing speed of fuel, and hence a combustion quantity is reduced while a ratio of the combustion air to the fuel remains constant. When the combustion quantity is decreased, a primary flame is cooled by a burner head 4, and the flame is extinguished when the cooling quantity exceeds the combustion quantity. Accordingly, odor due to combustion residual gas can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus for premixing vaporized liquid fuel and combustion air for combustion.

[0002]

2. Description of the Related Art FIG.
FIG. 2 is a cross-sectional view showing a combustor of a conventional liquid fuel combustion apparatus disclosed in Japanese Patent Laid-Open Publication No. JP-A-2003-242, in which 1 is a vaporization chamber that is a chamber for vaporizing liquid fuel, and 2 is a sidewall of the vaporization chamber 1. The electric heater 2 heats the vaporization chamber 1. Reference numeral 3 is a throttle portion fitted and fixed to the upper portion of the vaporization chamber 1, 4 is a burner head provided on the upper portion of the throttle portion 3, and 5 is a plurality of flame holes provided on the side wall of the burner head 4. Further, 6 is a wire net tightly wound around the outer peripheral surface of the burner head 4, 7 is a cap arranged on the upper part of the wire mesh, 8 is the narrowing part 3 of the burner head 4 and the cap 7.
It is a special screw whose one end is embedded in the throttle portion 3 in order to fix it to the.

Reference numeral 9 denotes a mixing plate 9 provided in the burner head 4 and having a plurality of holes on its bottom surface. The mixing plate 9 rectifies vaporized liquid fuel and then ejects it from a plurality of flame holes 5. Is. Reference numeral 10 is an annular flame holding ring attached to the upper part of the vaporization chamber 1 so as to surround the burner head 4.

Reference numeral 11 denotes a nozzle installed on the side wall of the vaporization chamber 1 and opening in the vaporization chamber 1. The nozzle 11 is an air supply pipe (not shown) communicating with a combustion blower (not shown). It is connected to the. Further, the nozzle 11 is composed of an inlet portion 11a, a tapered portion 11b and a throat portion 11c. Reference numeral 12 denotes a fuel supply pipe arranged coaxially with the nozzle 11 so that the fuel supply port 12a at the tip portion projects from the throat portion 11c, and a fuel tank (not shown).
The liquid fuel is supplied to the vaporization chamber 1 by a fuel pump (not shown) via the fuel supply pipe 12.

Next, the operation will be described. Electric heater 2
When the liquid is energized, the vaporization chamber 1 is preheated to a temperature (200 to 300 ° C.) necessary for vaporizing the liquid fuel. After completion of the preheating, the combustion air sent from the combustion blower to the air supply pipe is supplied from the nozzle 11 to the vaporization chamber 1. Further, from the fuel supply pipe 12, an amount of liquid fuel having a primary air ratio (= supply air amount / theoretical air amount) of about 0.8 is supplied to the vaporization chamber 1.

The supplied liquid fuel is atomized by the flow of combustion air and vaporized on the vaporized surface that has been preheated. The vaporized liquid fuel is further premixed with the combustion air when passing through the throttle portion 3, so that the concentration distribution becomes uniform. After that, the premixed gas of vaporized fuel and combustion air is rectified by passing through a plurality of holes in the bottom surface of the mixing plate 9, and the side wall of the mixing plate 9 causes the vertical flow velocity distribution of the burner head 4 to change. Be uniform. The premixed gas is ignited on the flame holes 5 of the burner head 4 by an igniter (not shown) to form a primary flame 14 and a secondary flame 15. After the combustion is started, the vaporization chamber 1 is heated by the heat recovery from the flame by the flame holding ring 10 and the like, so that the input to the electric heater 2 is not necessary.

By the way, in such a combustion apparatus, when the fire of the combustor is extinguished, the application of voltage to the fuel pump and the combustion blower is simultaneously released. In this case, the fuel pump stops almost instantaneously, whereas the combustion blower gradually decreases the rotation speed due to its inertia even after the application of the voltage is stopped, and stops after a few seconds. Therefore, the decrease of fuel is very fast as shown by the solid line in FIG. 24. When the power supply to the fuel pump is stopped at T ₀ , the evaporation amount becomes zero at T ₁ although it is slightly delayed due to vaporization or the like. On the other hand, the decrease of combustion air is slower than that of fuel, and the supply is stopped at T ₂ as indicated by the broken line. In this type of combustor, since the primary air ratio (combustion air to fuel ratio) is in the combustible range from T ₀ to T at the time of extinguishing, combustion continues, but since T becomes excessive air , The flame blows off. Thus, due to the imbalance between the decreasing rates of the two,
Since the primary air ratio at the time of extinguishing increases instantly and the flame blows off, the unburned fuel in the shaded area in FIG. 24 is discharged indoors. At this time, a part of the unburned fuel comes into contact with the high temperature part of the combustion apparatus and is partially oxidized, and substances such as aldehyde are produced, which causes an unpleasant odor accompanied by irritation.

As a measure for reducing the odor of fire extinguishing, there is the use of a suction device which is often used in wick-type combustion (oil stove). FIG. 25 shows a combustion device disclosed in, for example, Japanese Examined Patent Publication No. 2-20884, in which the fuel evaporated from the wick 61 and the combustion air from the lower opening of the combustion tube 62 are diffusively mixed and burned. The combustion air at this time is sucked by the natural draft force, and an air supply device such as a blower is not specially installed. Although the extinguishing operation is performed by lowering the wick 61, a small amount of fuel vaporized after the wick 61 descends becomes odor and is discharged. For this measure, suction device 63
The evaporative fuel is sucked in and is further treated by the adsorbent 64 in this case to reduce the extinguishing odor. In this case, the effect of the suction device 63 is exerted because the natural draft force, which is the drive source of the combustion air, is small. Therefore, in the combustion device forcibly supplying the combustion air as shown in FIG. The combustion air supplied by inertia burns out the remaining fuel and the odor suction effect is reduced.

Further, even in the forced air supply type combustion device, there has been considered a device for sucking the unburned fuel in the vaporization chamber by the suction means operating in conjunction with the fire extinguishing operation. FIG. 26 shows a combustion device disclosed in, for example, Japanese Unexamined Patent Publication No. Sho 56-80633, in which liquid fuel supplied by a fuel pump 71 is vaporized in a vaporization chamber 72, and the vaporized fuel and combustion supplied by a blower fan 73. The air-fuel mixture burns in the burner head 74. When extinguishing the fire, the suction device 75 operates to suck the unburned fuel. However, in such a configuration, when the suction capacity (suction flow rate) of the suction device 75 is small,
Even if the suction device 75 is operated at the same time when the fuel pump 71 and the blower fan 73 are stopped, the reduction of the combustion air at the time of extinguishing the fire is reduced.
As shown in FIG. 7, the time T _{0 to} T ₂ until the flow rate becomes zero
However, the amount of unburned fuel is almost the same as in FIG. Further, a large amount of combustion air is supplied after the time T when the blowout occurs, and the unburned fuel is pushed out of the burner head 74 by this combustion air.
The suction device having a small capacity cannot pull back the unburned fuel which has been pushed out, and the odor reducing effect becomes small. Further, when the suction capacity (suction flow rate) of the suction device 75 is large, the reduction of the combustion air at the time of extinguishing becomes very short or zero at times T _{0 to} T ₂ as shown in FIG. 28. However, flashback occurs when such a rapid flow rate change is given. That is, before the fire extinguishing operation (during steady combustion), the burner head 74 balances the flow velocity of the air-fuel mixture with the combustion speed to continue combustion, but if a rapid flow rate change is applied, this situation collapses and the mixture is mixed. Since the flow velocity of air is much lower than the combustion velocity, flashback occurs upstream of the burner head 74. When a flashback occurs, combustion occurs inside the vaporization chamber 72, so that the vaporization chamber 72 becomes hot and durability against repeated use deteriorates. Further, in order to provide a suction device having such a large suction capability, a fan equal to or higher than the blower fan 73 is required, and the combustor becomes large and costly.

In order to suck in the unburned fuel without increasing the size and cost of the combustor, a device using a blower of combustion air for suction has been considered. FIG. 29 shows a combustion device shown in, for example, Japanese Patent Publication No. 61-46722, the combustion operation of which is basically the same as that of the combustion device shown in FIGS. 23 and 26. The fuel from the pump device 82 is vaporized and mixed in the vaporization chamber 83 and burned in the burner head 84. At this time, the intake valve device 85 is open and the exhaust valve device 86 is closed. When extinguishing the fire, by closing the intake valve device 85 and opening the exhaust valve device 86, the unburned fuel remaining in the vaporization chamber 83 is sucked into the low pressure portion 88 formed in the ejector portion 87. However, also in this case, as in the case of the combustion device of FIG. 26, if the pressure inside the vaporization chamber 83 is slowly reduced, the unburned fuel is burned out immediately after extinguishing, and the fuel is discharged to the outside of the burner head 84. Then a flashback will occur. Therefore, even if it is possible to use both the blower and the suction device,
The odor reduction effect is considered to be the same as that of the combustion device of FIG.

[0011]

Since the conventional liquid fuel combustion apparatus is configured as described above, the combustion apparatus shown in FIG. 23 efficiently removes the odor emitted during extinction.
Further, there is a problem that it cannot be reduced in size and at low cost.

The present invention has been made to solve the above problems, and an object thereof is to obtain a liquid fuel combustion apparatus which emits less odor when extinguishing a fire.

[0013]

According to a first aspect of the present invention, there is provided a liquid fuel combustion apparatus, comprising a fuel supply means and a combustion blower so that the liquid fuel supply amount and the combustion air supply amount decrease at the same time during a fire extinguishing operation. It has a control circuit for controlling at least one of them.

A liquid fuel combustion apparatus according to a second aspect of the present invention is the liquid fuel combustion apparatus according to the first aspect of the present invention, wherein the rate of decrease of the combustion air supply amount is controlled during the fire extinguishing operation to reduce the rate of decrease of the liquid fuel supply amount and the combustion air supply amount. It is provided with a control circuit for making them equal.

According to a third aspect of the present invention, in the liquid fuel combustion apparatus according to the second aspect of the invention, the air supply means is braked during the fire extinguishing operation so that the liquid fuel supply amount and the combustion air supply amount are reduced at the same rate. It is equipped with a circuit.

A liquid fuel combustion apparatus according to a fourth aspect of the present invention is the liquid fuel combustion apparatus according to the second aspect, wherein a passage opening / closing mechanism provided in a combustion air blow path between the combustion blower and the vaporization chamber is closed during a fire extinguishing operation. And a control circuit for equalizing the reduction rates of the liquid fuel supply amount and the combustion air supply amount.

A liquid fuel combustion apparatus according to a fifth aspect of the present invention is the liquid fuel combustion apparatus according to the first aspect of the present invention, which controls the reduction rate of the liquid fuel supply amount during the fire extinguishing operation so as to control the reduction rate of the liquid fuel supply amount and the combustion air supply amount. It is provided with a control circuit for making them equal.

A liquid fuel combustion apparatus according to a sixth aspect of the present invention is the liquid fuel combustion apparatus according to the first aspect of the present invention, which controls the reduction rate of the combustion air supply amount during the fire extinguishing operation and controls the reduction rate of the liquid fuel supply amount. It is provided with a control circuit for equalizing the decreasing rates of the supply amount and the combustion air supply amount.

According to a seventh aspect of the present invention, there is provided a liquid fuel combustion apparatus, a constant oil leveling device for constantly storing a constant amount of liquid fuel, a pump for pumping the liquid fuel to the constant oil leveling device, and a blowing pressure of combustion air for the constant oil leveling device. A fuel supply means for supplying fuel, which has a pressure pipe for adding to the vessel, a blower for combustion for supplying combustion air, and a vaporization chamber for vaporizing the supplied liquid fuel are provided.

A liquid fuel combustion apparatus according to an eighth aspect of the present invention is the liquid fuel combustion apparatus according to any one of the first to seventh aspects of the invention, which controls the combustion blower so that the unburned gas in the vaporization chamber flows backward after the flame is exhausted. A liquid fuel combustion apparatus having a control circuit.

A liquid fuel combustion apparatus according to a ninth aspect of the present invention is the liquid fuel combustion apparatus according to the first to seventh aspects, in which the combustion chamber is arranged so as to cover the flame formed in the flame hole, and the combustion chamber moves from the combustion chamber during normal operation. In addition to mixing and diffusing the combustion gas and the air into the chamber, a convection fan is provided to add the pressure of the air flow to the combustion chamber so that the pressure outside the combustion chamber is higher than the pressure inside the combustion chamber after the flame is extinguished. .

A liquid fuel combustion apparatus according to a tenth aspect of the present invention is the liquid fuel combustion apparatus according to the ninth aspect, wherein a casing for covering the combustion chamber and the convection fan is provided with a warm air outlet for discharging the warm air sent from the convection fan. The hot air outlet is provided with an opening / closing mechanism that is closed when a fire is extinguished.

A liquid fuel combustion apparatus according to an eleventh aspect of the present invention is the liquid fuel combustion apparatus according to any one of the first to seventh aspects of the invention, in which control is performed to control the suction device so as to suck the unburned gas in the vaporization chamber after the flame disappears. It is equipped with a circuit.

A liquid fuel combustion apparatus according to a twelfth aspect of the present invention is the liquid fuel combustion apparatus according to any one of the eighth to eleventh aspects of the invention, which is installed at a position apart from the suction port of the convection fan and discharges the unburned gas that has been sucked or backflowed. It is equipped with.

A liquid fuel combustion apparatus according to a thirteenth aspect of the present invention is the liquid fuel combustion apparatus according to any of the eighth to eleventh aspects of the present invention, which is provided with an adsorbent that is installed in the discharge path of the unburned residual gas that has been sucked or backflowed.

A liquid fuel combustion apparatus according to a fourteenth aspect of the present invention is the liquid fuel combustion apparatus according to any of the eighth to eleventh aspects of the present invention, which is provided with an exhaust gas purifying catalyst that is installed in the discharge path of the unburned residual gas that is sucked or flows backward.

A liquid fuel combustion apparatus according to a fifteenth aspect of the present invention is the liquid fuel combustion apparatus according to the eighth aspect, wherein the combustion air blowing path and the fuel tank are connected by two branch pipes, and a route is provided in the middle of each branch pipe. A switching device is installed, and a control circuit is provided for controlling the path switching device to switch the backward flow of unburned residual gas to the fuel tank at the time of fire extinguishing operation.

A liquid fuel combustion apparatus according to a sixteenth aspect of the present invention is the liquid fuel combustion apparatus according to any of the eighth to eleventh aspects, further comprising a suction device for sucking the unburned gas and guiding it to the fuel tank.

[0029]

In the control circuit according to the first aspect of the present invention, by equalizing the decreasing rates of the liquid fuel supply amount and the combustion air supply amount during the fire extinguishing operation, the mixture concentration is within the combustible range up to a slight combustion amount, and the flame is blown. It does not disappear. Then, since the flame is extinguished when the amount of combustion becomes extremely small, the amount of unburned gas decreases. Also, it is small by changing the control circuit.
The amount of unburned gas can be reduced at low cost.

In the control circuit according to the second aspect of the present invention, in addition to the first aspect of the invention, by controlling the reduction rate of the combustion air supply amount to make the reduction rate equal, a slower reduction rate of the combustion air supply amount can be achieved. It is accelerated and the amount of unburned gas is further reduced.

In the control circuit according to the invention of claim 3, in addition to the invention of claim 2, the amount of unburned gas can be reduced only by braking the air supply means.

In the control circuit according to the invention of claim 4, in addition to the invention of claim 2, the amount of unburned gas can be reduced by closing the flow passage opening / closing mechanism provided in the combustion air blowing path to reduce the amount of unburned gas. It is effective when the supply means cannot be braked.

The control circuit according to a fifth aspect of the present invention, in addition to the first aspect of the invention, controls the decrease rate of the liquid fuel supply amount so that the decrease rate becomes equal, thereby reducing the decrease rate of the combustion air supply amount. Enabled if is out of control.

In addition to the invention of claim 1, the control circuit in the invention of claim 6 controls the decreasing rate of the combustion air supply quantity and the decreasing rate of the liquid fuel supply quantity to control the decreasing speed. Can be adjusted between the reduction rate of the combustion air supply rate and the reduction rate of the liquid fuel supply rate.

The fuel supply means in the invention of claim 7 is
The blast pressure of the combustion air is constantly applied to the constant oil level device, and fuel is supplied according to the magnitude of the blast pressure. Therefore, even if the blowing pressure becomes small during the fire extinguishing operation, a small amount of fuel is supplied following the pressure so that the liquid fuel supply amount and the combustion air supply amount are reduced at the same rate. Further, the amount of unburned gas can be reduced without changing the control circuit.

The blower for combustion according to the invention of claim 8 is
In addition to the inventions of claims 1 to 7, by causing the unburned gas in the vaporization chamber to flow backward, the unburned gas is discharged to the front surface of the liquid fuel combustion device after the extinction in the invention. In some cases, prevent this.

In the liquid fuel combustion apparatus according to the invention of claim 9, the combustion gas from the combustion chamber and the air are mixed by a convection fan during normal operation and diffused into the chamber, and after quenching, the outside of the combustion chamber is controlled by the pressure inside the combustion chamber. The pressure of the air flow is applied to the combustion chamber so as to increase so that the unburned gas flows backward. Therefore,
No unburned gas is discharged to the front of the liquid fuel combustion device. Further, it is only necessary to design the shape, arrangement, capacity and the like of the members that have been conventionally used so as to have the above-mentioned function, and the structure is facilitated without providing new members.

In the opening / closing mechanism according to the invention of claim 10, in addition to the invention of claim 9, by closing the hot air outlet when extinguishing the fire, the pressure difference between the outside of the combustion chamber and the inside of the combustion chamber is further increased, and the mechanism is strengthened. Reverse the unburned gas.

According to the invention of claim 11, in addition to the invention of claims 1 to 7, the invention of claims 1 to 7 is characterized in that the unburned gas in the vaporization chamber is sucked.
The unburned gas may be discharged to the front surface of the liquid fuel combustion device after the extinction, but this is prevented. Further, it is effective when the backflow cannot be performed by the blower for combustion shown in the invention of claim 8.

According to the twelfth aspect of the invention, in addition to the eighth aspect through the eleventh aspect of the invention, the discharge port is installed at a position apart from the suction port of the convection fan, so that the unburned gas that has been sucked or flows backward is discharged. Also, the unburned gas is not sucked from the suction port of the convection fan, and the unburned gas is prevented from being discharged to the front surface of the liquid fuel combustion device.

In addition to the inventions of claims 8 to 11, the adsorbent in the invention of claim 13 is installed in the discharge path of the unburned gas, so that in the inventions of claims 8 to 11, the adsorbent Although it was discharged somewhere in the surroundings, the odor of the unburned gas is reduced to zero by the adsorbent.

The exhaust gas purifying catalyst according to the invention of claim 14 is, in addition to the invention of claims 8 to 11, provided by being installed in a discharge path of unburned gas.
In the first aspect of the invention, the gas is discharged somewhere around the liquid fuel combustion device, but the odor of the unburned gas is reduced to zero by the exhaust gas purification catalyst.

The liquid fuel combustion apparatus according to a fifteenth aspect of the present invention is, in addition to the eighth and eleventh aspects of the present invention, configured to guide the unburned residual gas that has flowed backward by switching the path switching device installed in the branch pipe to the fuel tank. As a result, it is possible to prevent the unburned gas from being discharged to the periphery of the liquid fuel combustion device, and to collect the unburned gas by condensing the unburned gas in the fuel tank. Furthermore, by guiding the unburned gas to the unburned gas fuel tank by the force of the blower for combustion, the structure can be simplified without adding a pump or the like.

According to the liquid fuel combustion apparatus of the sixteenth aspect of the present invention, in addition to the inventions of the eighth to eleventh aspects, the unburned gas is guided to the fuel tank by the suction device so that the unburned gas is discharged to the periphery of the liquid fuel combustion apparatus. Prevent the discharge of
Further, the unburned gas can be recovered by condensing the unburned gas in the fuel tank. Furthermore, a branch pipe, a path switching device, etc. are not required, which simplifies the configuration.

[0045]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a liquid fuel combustion apparatus according to an embodiment of the present invention. Incidentally, the same or corresponding parts as those of the conventional example shown in FIG. 23 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, reference numeral 21 denotes a fuel pump (fuel supply means) for supplying liquid fuel, which is also used in the conventional example. One end of the fuel pump 21 is located in the fuel tank 22 and the other end is for fuel supply. It is connected to the pipe 12. Again 2
Reference numeral 3 is an air supply pipe (combustion air blowing path) which is connected to the nozzle 11 and supplies combustion air, and 24 is a blower for combustion.
Reference numeral 25 is a control circuit 25 installed to control the fuel pump 21 and the combustion blower 24.

Next, the operation will be described. The operation of starting combustion (ignition) is almost the same as the conventional example. When the vaporization chamber 1 is heated to a predetermined temperature (200 to 300 ° C.), the combustion blower 24 rotates and the amount of air required for combustion is supplied to the vaporization chamber 1. After operating the ignition device (not shown), the fuel pump 21 starts supplying the liquid fuel. The liquid fuel injected into the vaporization chamber 1 is vaporized on the vaporization surface and mixed with the combustion air to form a premixed gas. The premixed air passes through the throttle portion 3 and the mixing plate 9 and is ignited on the flame holes 5 of the burner head 4 to form the primary flame 14 and the secondary flame 15. The burned gas is mixed with air from a convection fan (not shown) and used for heating the room.

When the user turns off the power switch (not shown) to extinguish the fire when the fire is extinguished, the control circuit 25
At this point, the application of voltage to the fuel pump 21 is stopped. The stopping operation of the fuel pump in this case is the same as the conventional one, and the decrease of the fuel becomes zero in the time of T _{0 to} T ₁ as shown by the solid line in FIG.
This is the same reduction rate as in FIG. 24 of the conventional example. On the other hand, with respect to the combustion air, for example, when the drive power source of the combustion blower 24 is AC, the drive circuit is switched in the control circuit 25, and the AC power source is subjected to half-wave rectification or full-wave rectification shown in FIG. The air blower 24 is braked to reduce the air flow rate. The flow rate of the combustion air at this time becomes zero in a short time as compared with the conventional example of FIG. 24, as shown by the broken line of FIG.
Therefore, the combustion air is almost equal to the fuel decrease rate (T ₁ ≈
By T ₂ ), the combustion amount decreases while the ratio of combustion air to fuel (primary air ratio) remains constant. When the combustion amount becomes small, the primary flame 14 becomes small and comes close to the burner head 4, so that the primary flame is cooled by the burner head 4.
When the cooling amount exceeds the combustion amount (time T in FIG. 2), the flame is extinguished. The unburned fuel in this case is the portion shown by the diagonal lines in FIG. 2, and is smaller than that in the conventional example in FIG.

Further, since the flow rate of the combustion air at the time T when the flame is extinguished is small and the time from the time T when the flame is extinguished to the time T ₂ when the combustion air becomes zero, the amount of combustion air supplied within this time is extremely large. Few. Therefore, a small amount of unburned fuel which is indicated by the diagonal lines in FIG.
It is hardly pushed out to the outside, and a small amount of unburned fuel remains in the vaporization chamber 1.

FIG. 4 shows the result of a typical odor measurement in this case. FIG. 4 shows the concentration of hydrocarbons (Hydrocarbon = HC) which is an index showing the magnitude of odor. In the conventional combustion device, a high concentration peak is shown immediately after extinguishing the fire as shown by the dotted line. On the other hand, in the combustion apparatus according to the present embodiment, as shown in FIG. 2, the amount of unburned fuel remaining is very small, and the unburned fuel does not flow out of the vaporization chamber 1. Therefore, the odor emitted immediately after extinguishing the fire is eliminated. As shown by the solid line in FIG. 4, it is extremely small, and falls to 1/10 to 1/20 of the conventional level. However, in this case, since the unburned fuel is not zero, the fuel remaining in the vaporization chamber 1 gradually diffuses to the outside after several seconds to several tens of seconds after extinguishing the fire. This measure will be described in an example described later.

Example 2. FIG. 5 is a block diagram showing a liquid fuel combustion apparatus according to an embodiment of the present invention. In the first embodiment, the combustion blower 24 is braked in order to increase the rate of decrease of the combustion air. However, an example in which a passage opening / closing mechanism such as an opening / closing valve is installed in the middle of the combustion air passage is shown here. In the figure, reference numeral 26 denotes a flow path opening / closing mechanism provided in the middle of the air supply pipe 23 and controlled by the control circuit 25. The flow path opening / closing mechanism 26 is, for example, as shown in FIG.
The valve mechanism such as the butterfly valve 27 shown in FIG.
8 or the like, or a solenoid valve 29 which is opened / closed by a spring 30 and an electromagnet 31 shown in FIG.
It is. FIG. 5 shows an example of a butterfly valve.

Next, the operation will be described. In order to synchronize the decrease rate of the fuel and the combustion air at the time of extinguishing by using the flow path opening / closing mechanism 26, if the decrease rate of the fuel is not controlled as shown in the first embodiment, this fuel Only the flow path opening / closing mechanism 26 may be instantly closed so as to be equal to the decreasing speed. In this case, in the example of the butterfly valve of FIG. 6, the speed of the step motor 28 may be increased to instantly close the flow path, and in the example of the solenoid valve of FIG. 7, when the electromagnet 31 is turned off, the action of the spring 30 causes instantaneous flow. Just close the road.
In this way, the amount of unburned fuel when the flow passage opening / closing mechanism 26 is used is the same as that in FIG. 2 in which the combustion blower 24 of the first embodiment is braked.

In the case where the decreasing rate of the combustion air is made gentle as in the embodiment described later, the closing rate of the flow passage opening / closing mechanism 26 may be adjusted according to the decreasing rate of the fuel. In the example of the butterfly valve of FIG. 6, the step motor 28
Since the speed of can be easily changed, it is easy to moderate the decrease speed.

Example 3. This embodiment relates to the inventions of claims 1 and 5. In the first embodiment, the rate of decrease of fuel and combustion air is made equal by increasing the rate of decrease of combustion air, but here, the same effect is realized by decreasing the rate of decrease of fuel. The configuration of this embodiment is almost the same as that of FIG. 1 except for the control circuit. In the first embodiment, in order to stop the pump 21 at the time of extinguishing the voltage, the application of the voltage is released to reduce the fuel supply amount, and the combustion blower 24 is braked to accelerate the reduction rate of the combustion air. On the other hand, since the combustion blower 24 of this embodiment only releases the application of the voltage, the decreasing rate of the combustion air is slow as in the conventional example shown in FIG. 24 due to the inertia of the combustion blower 24. It was done. The reduction rate of the combustion air is grasped in advance, the fuel supply amount is gradually reduced, and the reduction rates of both are synchronized as shown in FIG. As a method of controlling the fuel supply means, for example, in a plunger type electromagnetic pump or the like, the drive waveform is gradually decreased by decreasing the frequency (longer cycle) or shortening the on time as shown in FIG. The supply can be reduced. In this way, when the fuel and the combustion air are synchronized, the unburned fuel remains as shown by the diagonal lines in FIG. 8, and although the amount thereof is slightly increased as compared with the first embodiment, there is a great reduction effect as compared with the conventional one. .

Example 4. This embodiment relates to the inventions of claims 1 and 6. In the first embodiment, only the combustion air is controlled, and in the third embodiment, only the fuel is controlled to synchronize the reduction ratios of the fuel and the combustion air. It goes without saying that the reduction speed has almost the same effect. In this case, the combustion blower 24 can be controlled by a method in which the AC waveform is alternated as shown in FIG. On the other hand, the fuel decrease rate is controlled by controlling the pump drive waveform as described in the third embodiment to match the combustion air decrease rate. When the fuel and the combustion air are synchronized in this way, the reduction ratio of both is as shown in FIG. 11, and there is an odor reduction effect intermediate between those of the first and third embodiments.

Example 5. FIG. 12 is a configuration diagram showing a liquid fuel combustion apparatus according to an embodiment of the inventions of claims 1 and 7.
In the first to fourth embodiments, an example in which a pump is used as the fuel supply means has been shown, but in this embodiment, a means for synchronizing the decreasing rate of the fuel / combustion air using another fuel supply means will be shown. In FIG. 12, reference numeral 32 is a constant oil leveling device that constantly stores a fixed amount of liquid fuel, 33 is an inner box provided inside the constant oil leveling device 32, and 34 is a liquid level of the fuel. Reference numeral 35 is a pressure pipe for applying a blowing pressure of fuel air to the constant oil level device 32, and 36 is a pressure pipe 3
5 is a pressure pipe opening / closing mechanism such as an electromagnetic solenoid provided in the middle of 5. The rest of the configuration is the same as in FIG. 1 and its explanation is omitted.

Next, the operation will be described. The pump 21 is used to pump fuel to the constant oil level gauge 32. There is an inner box 33 in the constant oil level device 32, and the pumped fuel overflows from the inner box 33 to cause the liquid level 34 of the fuel to rise.
Always has a constant height. This liquid level 34 is the fuel supply pipe 1
The height is set to be the same as that of the tip 12a of 2. Fuel supply pipe 12
The other end of is placed in the inner box 33. The constant oil level device 32 is connected to the air supply pipe 23 via a pressure pipe 35, and a pressure pipe opening / closing mechanism 36 such as an electromagnetic solenoid is provided in the middle of the pressure pipe 35.

The air supply pipe 2 is closed by closing the pressure pipe opening / closing mechanism 36.
If the pressure in 3 is not applied to the oil level gauge 32,
4 and the tip 12a of the fuel supply pipe 12 are at the same height, fuel is not supplied. When the pressure pipe opening / closing mechanism 36 is opened while the combustion air is being sent by the combustion blower 24, pressure is applied to the liquid level 34 of the constant oil level device 32, and the fuel supply pipe tip 12
Fuel is pushed out from a. The pressure P acting on the constant oil level device 32 can be basically expressed by the following equation. P = k _a × Q _a ² (1) where, P: pressure applied to the constant oil level device Q _a : combustion air flow rate k _a : coefficient

Further, the fuel flow rate can be expressed by the following equation. Q _f = k _f (P + γH) ^1/2 (2) where, Q _f : fuel flow rate H: difference between fuel supply pipe tip a and height of liquid level in constant oil level gauge γ: specific weight of kerosene k _f The coefficient H in the equation (2) is H = 0 because the liquid level 34 and the tip 12a of the fuel supply pipe 12 are at the same height as described above. Therefore, substituting equation (1) into equation (2) yields the following. ^{_{Q f = k f P 1/2 =}} k f (k a × Q a 2) 1/2 = KQ a (3) where, K: coefficient = k _f k _a ^1/2

Therefore, since the fuel flow rate Q _f increases / decreases in proportion to the combustion air flow rate Q _a , as long as the pressure pipe opening / closing mechanism 36 is open, the combustion air and the fuel keep increasing / decreasing at the same ratio. Therefore, if the pressure pipe opening / closing mechanism 36 is left open during the fire extinguishing operation, the fuel also decreases in synchronization with the combustion air,
The same state as in FIG. 8 can be realized. Further, even if the combustion blower 24 is braked, or the combustion air reduction speed is increased by providing a passage opening / closing mechanism in the middle of the air supply pipe 23, the fuel and the combustion air are synchronized, and therefore, as shown in FIG. Figure 1
In this case, the same effect as that of the above-described embodiment can be realized.

Example 6. This embodiment relates to the invention of claims 1-8. In Examples 1 to 5, since the combustion amount is made extremely small by synchronizing the decrease of the fuel and the combustion air to extinguish the flame, the unburned fuel is decreased, and the odor immediately after extinction is as shown in FIG. 1/10 to 1 / compared to
It decreases to about 20. However, the unburned fuel does not become completely zero and remains in the burner head 4 and the vaporization chamber 1 to some extent. Therefore, the unburned fuel gradually flows out to the outside in a few seconds to a few tens of seconds after the extinction. Figure 4
A small amount of odor is emitted at a time point after the fire-extinguishing operation as indicated by the alternate long and short dash line. This embodiment relates to measures against unburned fuel that gradually flows out to the outside after several seconds to several tens of seconds from the extinction. The structure of this embodiment is almost the same as that of FIG. 1, except that the combustion blower 24 is a reversely rotatable one. For example, when the drive power source of the combustion blower 24 is direct current, the polarity is reversed to cause reverse rotation.

Next, the operation will be described. The operation until the combustion air becomes zero at the time of the fire extinguishing operation is performed as in Examples 1, 3 and 4, and after the flame is extinguished and the combustion air becomes zero, the unburned fuel in the vaporization chamber 1 is burner head. 4. The combustion blower 24 is rotated in the reverse direction during a few seconds to a few tens of seconds when it diffuses to the outside. Then, the unburned fuel in the vaporization chamber 1 is sucked by the combustion blower 24 and does not flow out of the burner. The processing of the sucked odor will be described in Examples below.

Further, when a flow passage opening / closing mechanism 26 such as an open / close valve is installed in the middle of the combustion air flow passage as in the second embodiment,
The same effect can be obtained if the flow passage opening / closing mechanism 26 is restarted after the flame is extinguished and before the combustion blower 24 is rotated in the reverse direction. Further, in the case where the fuel supply means is a combustion device for applying combustion air pressure as in the fifth embodiment, the pressure pipe opening / closing mechanism 36 is closed until the combustion blower 24 is reversely rotated after the flame is extinguished. For example, even if the combustion blower 24 is rotated in the reverse direction, no pressure is applied to the constant oil level device 32, and it is possible to prevent the adverse effect that the fuel is supplied after the flame is extinguished, and the unburned gas flows backward similarly to the above.

Example 7. FIG. 13 is a sectional view showing a liquid fuel combustion apparatus according to an embodiment of the invention of claims 1 to 7 and 9. This embodiment also relates to measures against unburned fuel that gradually flows out to the outside after several seconds to several tens of seconds from extinction. In FIG. 13, the burner uses the combustion device shown in Examples 1, 3, and 4 and the like. Further, 41 is a casing for installing the combustion device, 42 is a combustion chamber that is provided above the burner head 4 and forms a space where the secondary flame 15 is formed, 43 is a convection fan provided on the back surface of the casing 41, and 44 is The hot air outlet is installed on the front surface of the casing 41.

Next, the operation will be described. During combustion, as indicated by the white arrow in FIG. 13, the combustion gas from the combustion chamber 42 and the air from the convection fan 43 are mixed in the upper portion of the combustion chamber 42, and then discharged from the hot air outlet 44. To do. When the fire extinguishing operation is performed by the methods shown in Examples 1, 3 and 4 and the combustion gas becomes zero, only the air of the convection fan 43 is discharged from the warm air outlet 44 as shown by the arrow in FIG. To be done. At this time, the convection fan 4 is installed in the combustion chamber 42.
Pressure is applied by the air flow from 3 and this is the burner head 4.
As a result, the unburned gas in the vaporization chamber 1 does not flow back toward the combustion blower 24 and does not flow out from the burner head 4.

Here, the flow path opening / closing mechanism 2 as in the second embodiment.
When a burner equipped with 6 is used, the unburned gas does not flow backward when the flow path opening / closing mechanism 26 is closed,
If the flow path opening / closing mechanism 26 is opened again after the flame is extinguished, the above effect can be obtained. Further, in the case where the fuel supply means is configured to apply the combustion air pressure as in the fifth embodiment, if the pressure pipe opening / closing mechanism 36 is closed when the flame is extinguished, the constant oil level is generated by the air flow from the convection fan 43. No pressure is applied to the container 32,
It is possible to prevent the adverse effect that the fuel is supplied after the flame is extinguished, and the unburned gas flows backward as in the above.

Example 8. FIG. 14 is a cross-sectional view showing a liquid fuel combustion apparatus according to an embodiment of the invention of claims 1 to 7, 9 and 10, and in the figure, numeral 45 is installed in a hot air outlet 44, opened during combustion and closed during fire extinguishing. It is an opening and closing mechanism such as a shutter. Although the unburned gas flows backward even when the hot air outlet 44 is opened as in the seventh embodiment,
As shown in FIG. 14, by providing an opening / closing mechanism 45 that opens during combustion and closes during extinction, the convection fan 43 after extinction
Therefore, the pressure acting on the combustion chamber 42 is further increased, and the reverse flow effect of the residual unburned gas is increased.

Example 9. FIG. 15 is a configuration diagram showing a liquid fuel combustion apparatus according to an embodiment of the invention of claims 1 to 7, and in the figure, 37 is a communication pipe provided in the middle of the air supply pipe 23, and 38 is the communication pipe. The suction device connected to 37, 38a is a discharge port, and the suction device 38 is the control circuit 2
Controlled by 5. Other configurations are similar to those in FIG.

Next, the operation will be described. This embodiment also relates to measures against unburned fuel that gradually flows out to the outside after several seconds to several tens of seconds from extinction. The operation until the combustion air becomes zero at the time of the fire extinguishing operation is performed in the same manner as in Examples 1, 3 and 4, and for several seconds to several tens of seconds after the unburned fuel in the vaporization chamber 1 is discharged after the flame is extinguished. Then, the suction device 38 is started. Then, the unburned fuel in the vaporization chamber 1 is sucked by the suction device 38 and does not flow out of the burner. Although FIG. 15 shows an example in which the communication pipe 37 is installed in the middle of the air supply pipe 23, the same effect can be obtained by installing the communication pipe 37 in the combustion chamber 1.

Here, the flow path opening / closing mechanism 2 as in the second embodiment.
When a burner equipped with No. 6 is used, if the flow passage opening / closing mechanism 26 is kept closed, the suction effect of the unburned gas by the suction device 38 increases, and even if the flow passage opening / closing mechanism 26 is restarted. It has the same effect as the first, third and fourth embodiments. Further, in the case where the fuel supply means is configured to apply the combustion air pressure as in the fifth embodiment, if the pressure pipe opening / closing mechanism 36 is closed when the flame is extinguished, the constant oil level is maintained even if the suction device 38 is operated. The pressure is not applied to the container 32, and the adverse effect that the fuel is supplied after the flame is extinguished can be prevented, and the unburned gas is sucked in as described above.

Example 10. FIG. 16 is a three-dimensional view showing a liquid fuel combustion apparatus according to an embodiment of the invention of claims 1 to 12, and the figure is a rear view of the liquid fuel combustion apparatus shown in FIG. 13 and the like. In the figure, 46 is a power cord, 24
Reference numeral a denotes an air suction port (exhaust port), which is installed at positions B and C in this embodiment.

Next, the operation will be described. When the combustion blower 24 is rotated in the reverse direction as in the sixth embodiment, or the blow pressure of the convection fan 43 is used as in the seventh and eighth embodiments, the unburned fuel in the vaporization chamber is made to flow backward. Finally, this unburned fuel is the air inlet 24 of the blower for combustion.
It is discharged from a. At that time, the air suction port 24a is located at the position A.
As described above, when the fuel is near the convection fan 43, the discharged unburned fuel is taken into the convection fan 43 and flows out from the warm air outlet 44 to the front of the combustion device, so that the user feels an odor. Therefore, if the air suction port 24a is installed at a position distant from the convection fan 43, such as the positions B and C, the unburned fuel that has been discharged does not come out to the front surface, so that the user does not feel an odor. In addition, in FIG. 16, the blower 2 for combustion is shown.
Although the example of the suction port 24a of No. 4 is shown, the same effect can be obtained even if this is the discharge port of the suction device as in the ninth embodiment.

Example 11. FIG. 17 is a cross-sectional view showing a liquid fuel combustion apparatus according to an embodiment of the invention of claims 1 to 11, and in the drawing, 47 is an adsorbent installed at the suction port 24a of the combustion blower 24.

Next, the operation will be described. As described above, the method of discharging the unburned residual fuel that has been backflowed or sucked into the room as it is as described in Example 10 is effective for the user in front of the combustion apparatus. Some users (though relatively infrequent) feel odors. This embodiment is intended to improve such a point, and the backflow or sucked unburned gas is adsorbed by an adsorbent such as activated carbon.

FIG. 17 shows an example in which an adsorbent is installed in the method of causing the unburned gas to flow backward as in Examples 6 to 8. This is an example in which an adsorbent 47 is installed at the suction port 24a of the combustion blower 24, and the unburned residual gas that has flowed back is almost completely treated by the adsorbent 47. The adsorbent 47 may be installed at the outlet of the combustion blower 24 or in the middle of the air supply pipe 23, but if it is installed outside the combustion device as shown in FIG. The user can easily replace the battery when it has decreased. Further, FIG. 18 shows an example in which the adsorbent 47 is installed in the suction device 33 in the method for sucking the unburned gas of Example 9, and the effect in this case is the same as that in FIG. As the adsorbent to be used, zeolite, silica gel, activated alumina, etc. can be used in addition to the above-mentioned activated carbon.

Example 12 FIG. 19 is a cross-sectional view showing a liquid fuel combustion apparatus according to an embodiment of the invention of claims 1 to 11 and 14, in which 48 is a flow path of combustion air,
Moreover, it is an exhaust gas purification catalyst installed in the nozzle 11 near the vaporization chamber 1.

Next, the operation will be described. In Example 11, the unburned fuel was treated with the adsorbent, but in this Example, an example of treating with the exhaust gas purifying catalyst is shown. The odor from the combustor, that is, the unburned fuel is hydrocarbon (fuel and partially oxidized fuel), and the exhaust gas purifying catalyst that processes this is a precious metal-supported catalyst such as platinum and palladium, a base metal-supported catalyst and a transition metal ( Co, Fe, Mn, Ni, etc.) oxides, hexaaluminate catalysts, perovskite type oxides, etc. can be used. Among these, although the noble metal-supported catalyst has a high hydrocarbon treatment efficiency (oxidation reaction rate), it has a low efficiency at room temperature, so that it is necessary to raise the temperature of the catalyst. For that purpose, the exhaust gas purifying catalyst may be installed in the vicinity of the combustion chamber 42 and the vaporization chamber 1, which are high temperature portions of the combustion device. FIG. 19 is an example in which the exhaust gas purifying catalyst 48 is installed in the nozzle 11 which is a flow path for combustion air and is close to the vaporization chamber 1. Since the exhaust gas purifying catalyst 48 is heated by the heat of the vaporization chamber 1 and the unburned gas, the processing efficiency of the unburned fuel is improved. Example 9
When sucking with a suction device such as the one shown in FIG. 20, the secondary flame 15 and the flame holding ring 10 which are high temperature parts of the combustion device as shown in FIG.
Exhaust gas purification catalyst 48 near the combustion chamber (not shown), etc.
Should be installed. Furthermore, when the temperature of the exhaust gas purifying catalyst 48 is low and the treatment efficiency of unburned gas is insufficient,
A heater may be installed together with the exhaust gas purifying catalyst 48.

Example 13. 21 is a cross-sectional view showing a liquid fuel combustion apparatus according to an embodiment of the invention of claims 1 to 11, and in the figure, 51 and 52 are branch pipes connecting the air supply pipe 23 and the fuel tank 22, 53, Reference numeral 54 is a path switching device which is installed in each branching part and whose opening and closing is controlled by the control circuit 25.

Next, the operation will be described. In this embodiment, the unburned gas that flows backward or is sucked is condensed in the fuel tank 22. When the combustion blower 24 is rotated in the reverse direction as in the sixth embodiment, or the air pressure of the convection fan 43 is used as in the seventh and eighth embodiments to cause the unburned fuel in the vaporization chamber 1 to flow backward. However, the unburned gas cannot be introduced into the fuel tank 22 if the flow path configuration is unchanged. Therefore, as shown in FIG. 21, the air supply pipe 23
And branch pipes 51 and 52 connecting the fuel tank 22 and
Route switching devices 53 and 54 are installed in the middle of each, and the route switching devices 53 and 54 are connected to the control circuit 25.
Controls opening and closing. During combustion, the path switching device 53,
Reference numeral 54 is at a position different from that shown in FIG. 21 by 90 degrees, and the combustion air flows through the air supply pipe 23 toward the carburetor 1. When extinguishing the fire, when the combustion air becomes zero, the path switching devices 53, 54
21, the backflow odor flows toward the combustion blower 24 via the fuel tank 22 as indicated by the white arrow in FIG. When the unburned gas is guided to the fuel tank 22, the fuel components are condensed on the low temperature wall and the liquid surface, and the odor in the gas discharged from the combustion blower 24 is reduced.

When the unburned gas is sucked by the suction device 33 as in the ninth embodiment, the branch pipe and the path switching device shown in FIG. 21 are unnecessary, and the suction device is sucked as shown in FIG. All that is required is to connect the outlet of 33 to the fuel tank 22. Further, when the outlet of the suction device 33 is installed in the liquid fuel in the fuel tank 22 and the unburned gas is bubbled in the liquid fuel, the condensing effect becomes large.
6).

[0081]

As described above, according to the first aspect of the present invention, at least one of the fuel supply means and the combustion blower is arranged so that the reduction ratios of the liquid fuel supply amount and the combustion air supply amount are equalized during the fire extinguishing operation. Since it is configured to provide a control circuit for controlling either one of them, by making the reduction ratio of the liquid fuel supply amount and the combustion air supply amount equal during the fire extinguishing operation, the mixture concentration is within the combustible range up to a slight combustion amount. The blowout of the flame does not occur, and the flame is extinguished when the combustion amount becomes extremely small, so the amount of unburned gas can be reduced. Further, the odor caused by the unburned gas can be reduced at a small size and at low cost simply by changing the control circuit.

According to the invention of claim 2, in addition to the invention of claim 1, a control circuit for controlling the decreasing rate of the combustion air supply amount during the fire extinguishing operation to equalize the decreasing rate is provided. It is possible to speed up the decrease rate of the slow supply amount of combustion air and further reduce the odor caused by the unburned gas.

According to the invention of claim 3, in addition to the invention of claim 2, a control circuit is provided which applies braking to the air supply means at the time of the fire extinguishing operation so as to equalize the reduction ratios of the liquid fuel supply amount and the combustion air supply amount. With this configuration, it is possible to further reduce the odor caused by the unburned gas by simply applying the brake to the air supply means, and to simplify the configuration.

According to the invention of claim 4, in addition to the invention of claim 2, the flow passage opening / closing mechanism provided in the combustion air blowing path at the time of the fire extinguishing operation is closed to reduce the liquid fuel supply amount and the combustion air supply amount. Since the control circuit for equalizing the reduction rate is provided, even if the air supply means cannot be braked, it is possible to reduce the odor caused by the unburned gas without using the air supply means.

According to the invention of claim 5, in addition to the invention of claim 1, a control circuit for controlling the decreasing rate of the liquid fuel supply amount during the fire extinguishing operation to equalize the decreasing rate is provided. Even when the reduction rate of the combustion air supply amount is uncontrollable, the odor caused by the unburned gas can be reduced.

According to the invention of claim 6, in addition to the invention of claim 1, a control circuit is provided for controlling the rate of decrease of the supply amount of combustion air and controlling the rate of decrease of the liquid fuel supply amount at the time of fire extinguishing operation. As configured, the controlled rate of decrease can be adjusted between the rate of decrease of the combustion air supply rate and the rate of decrease of the liquid fuel supply rate.

According to the seventh aspect of the present invention, a constant oil leveler for constantly storing a fixed amount of liquid fuel, a pump for pumping the liquid fuel to the constant oil leveler, and a pressure for applying a blowing pressure of combustion air to the constant oil leveler. Since the fuel supply means for supplying fuel with a pipe is provided, even if the blast pressure becomes small during the fire extinguishing operation, a small amount of fuel is supplied by following the pressure, and the liquid fuel supply amount and the combustion air supply are supplied. Equalize the rate of decrease in quantity,
Odor caused by unburned gas can be reduced.
Further, the amount of unburned gas can be reduced without changing the control circuit.

According to the invention of claim 8, claims 1 to 7
In addition to the invention of, since it is configured to provide a blower for combustion that causes the unburned gas in the vaporization chamber to flow backward at the time of fire extinguishing operation,
In the inventions of claims 1 to 7, the unburned gas may be discharged to the front surface of the liquid fuel combustion apparatus after the flame is extinguished, and an odor may be felt, but this can be prevented.

According to the present invention, the convection fan mixes the combustion gas from the combustion chamber and the air during normal operation and diffuses them into the chamber, and after quenching, the pressure outside the combustion chamber is made higher than the pressure inside the combustion chamber. Since the pressure of the air flow is applied to the combustion chamber to cause the unburned gas to flow backward, the unburned gas is not discharged to the front surface of the liquid fuel combustion device, and an odor may be felt. Absent. In addition, the structure can be simplified without providing a new member.

According to the invention of claim 10, in addition to the invention of claim 9, since an opening / closing mechanism for closing the hot air outlet at the time of extinguishing is provided, the pressure difference between the outside of the combustion chamber and the inside of the combustion chamber is reduced. It becomes even larger, and the unburned gas can be strongly flowed back.

According to the invention of claim 11, in addition to the inventions of claims 1 to 7, a suction device for sucking unburned gas in the vaporization chamber is provided. Therefore, in the inventions of claims 1 to 7, Although the unburned gas may be discharged to the front surface of the liquid fuel combustion device after the flame is extinguished, the odor may be felt, but this can be prevented. Further, even when the backflow cannot be performed by the combustion blower according to the eighth aspect of the present invention, it is possible to prevent the odor caused by the unburned gas.

According to the twelfth aspect of the present invention, in addition to the eighth aspect and the eleventh aspect of the invention, since the exhaust port is installed at a position apart from the suction port of the convection fan, suction or reverse flow is performed from the exhaust port. Even if the unburned gas is discharged, the unburned gas is not sucked from the suction port of the convection fan, and the odor caused by the unburned gas can be prevented from being discharged to the front surface of the liquid fuel combustion device.

According to the invention of claim 13, in addition to the inventions of claims 8 to 11, since the adsorbent is arranged in the discharge path of the unburned gas, the invention of claims 8 to 11 The unburned gas was discharged somewhere around the fuel combustion device, but the odor of the unburned gas can be reduced to zero by the adsorbent.

According to the fourteenth aspect of the present invention, in addition to the eighth and eleventh aspects of the present invention, the exhaust gas purifying catalyst is installed in the discharge path of the unburned gas.
In the inventions 1 to 11, the unburned gas is discharged somewhere around the liquid fuel combustion device, but the odor of the unburned gas can be reduced to zero by the exhaust gas purification catalyst.

According to the fifteenth aspect of the present invention, in addition to the eighteenth aspect of the present invention, the unburned residual gas that has flowed backward due to the switching of the path switching device installed in the branch pipe is guided to the fuel tank. It is possible to prevent the residual gas from being discharged to the surroundings of the liquid fuel combustion device, and it is possible to recover the unburned gas by condensing the unburned gas in the fuel tank. Furthermore, by guiding the unburned gas to the unburned gas fuel tank by the force of the blower for combustion, the structure can be simplified without adding a pump or the like.

According to the sixteenth aspect of the present invention, in addition to the eighth to eleventh aspects of the invention, since the unburned gas is guided to the fuel tank by the suction device, the unburned gas is discharged to the surroundings of the liquid fuel combustion apparatus. Can prevent the discharge of
In addition, the unburned gas can be recovered by condensing the unburned gas in the fuel tank. Furthermore, a branch pipe, a path switching device, etc. are not required, and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a liquid fuel combustion apparatus according to claims 1 to 3.

FIG. 2 is an explanatory diagram showing how fuel and combustion air in FIG. 1 are reduced.

FIG. 3 is a power supply waveform diagram when braking is applied to the combustion blower of FIG. 1.

FIG. 4 is an explanatory view showing a conventional device and odor discharge of FIG. 1.

FIG. 5 is a configuration diagram showing a liquid fuel combustion apparatus according to claims 1, 2, and 4.

6 is a configuration diagram showing the flow path opening / closing mechanism (butterfly valve) of FIG. 5. FIG.

7 is a configuration diagram showing the flow path opening / closing mechanism (solenoid valve) of FIG.

FIG. 8 is an explanatory diagram showing how fuel and combustion air are reduced according to the first and fifth aspects of the invention.

FIG. 9 is a power supply waveform diagram for controlling the fuel supply device according to the first and fifth aspects of the invention.

FIG. 10 is a power supply waveform diagram when braking is applied to the combustion blower according to the first and sixth aspects of the invention.

FIG. 11 is an explanatory diagram showing how fuel and combustion air are reduced according to the first and sixth aspects of the invention.

FIG. 12 is a configuration diagram showing a liquid fuel combustion apparatus according to claims 1 and 7 of the present invention.

FIG. 13 is a cross-sectional view showing a liquid fuel combustion apparatus according to claims 1 to 7 and 9.

FIG. 14 is a cross-sectional view showing the liquid fuel combustion apparatus of the inventions of claims 1 to 7, 9 and 10.

FIG. 15 is a configuration diagram showing a liquid fuel combustion device according to claims 1 to 7 and 11.

FIG. 16 is a three-dimensional view showing a liquid fuel combustion apparatus according to the invention of claims 1-12.

FIG. 17 is a cross-sectional view showing a liquid fuel combustion apparatus according to claims 1 to 11 and 13 of the invention.

FIG. 18 is a configuration diagram showing a liquid fuel combustion apparatus according to claims 1 to 11 and 13 of the present invention.

FIG. 19 is a cross-sectional view showing a liquid fuel combustion apparatus according to claims 1 to 11 and 14.

FIG. 20 is a configuration diagram showing a liquid fuel combustion apparatus according to claims 1 to 11 and 14 of the invention.

FIG. 21 is a configuration diagram showing a liquid fuel combustion apparatus according to claims 1 to 11 and 15.

FIG. 22 is a configuration diagram showing a liquid fuel combustion apparatus according to claims 1 to 11 and 16 of the invention.

FIG. 23 is a sectional view showing a conventional liquid fuel combustion apparatus.

FIG. 24 is an explanatory view showing a state of reduction of the conventional liquid fuel combustion apparatus.

FIG. 25 is a configuration diagram showing a conventional combustor.

FIG. 26 is a configuration diagram showing a conventional combustor.

FIG. 27 is an explanatory diagram showing how fuel and combustion air are reduced in the conventional combustor shown in FIG. 26.

FIG. 28 is an explanatory diagram showing how fuel and combustion air are reduced in the conventional combustor shown in FIG. 26.

FIG. 29 is a configuration diagram showing a conventional combustor.

[Explanation of symbols]

1 vaporization chamber, 5 flame holes, 12 fuel supply pipe (combustion air blowing path), 21 fuel pump (fuel supply means), 22
Fuel tank, 24 Combustion blower, 25 Control circuit, 2
6 flow path opening / closing mechanism, 32 constant oil level gauge, 35 pressure pipe, 3
8 suction device, 38a outlet, 43 convection fan, 4
4 hot air outlet, 45 opening / closing mechanism, 47 adsorbent,
48 Exhaust gas purifying catalyst, 51,52 Branch pipe, 53,5
4 Route switching device.

Claims (16)

[Claims] 1. A fuel supply means for supplying a liquid fuel, a combustion blower for supplying combustion air, a vaporization chamber for vaporizing the supplied liquid fuel, and the vaporized liquid fuel and the supplied combustion air. Control for controlling at least one of the fuel supply means and the combustion blower so as to equalize the decrease rate of the liquid fuel supply amount and the combustion air supply amount during the fire extinguishing operation. And a liquid fuel combustion device having a circuit. 2. The liquid according to claim 1, further comprising a control circuit for controlling a decrease rate of the combustion air supply amount during the fire extinguishing operation so as to make the decrease rate of the liquid fuel supply amount equal to the decrease rate of the combustion air supply amount. Fuel combustion device. 3. The liquid fuel combustion apparatus according to claim 2, further comprising a control circuit that applies braking to the air supply means during a fire extinguishing operation so as to equalize the decrease ratios of the liquid fuel supply amount and the combustion air supply amount. . 4. A flow passage opening / closing mechanism provided in a combustion air blowing passage between a combustion blower and a vaporization chamber, and the flow passage opening / closing mechanism is closed during a fire extinguishing operation to supply a liquid fuel supply amount and combustion air supply. The liquid fuel combustion apparatus according to claim 2, further comprising a control circuit that equalizes the reduction rate of the amount. 5. The liquid according to claim 1, further comprising a control circuit for controlling a decrease rate of the liquid fuel supply amount during the fire extinguishing operation so as to equalize the decrease rates of the liquid fuel supply amount and the combustion air supply amount. Fuel combustion device. 6. A decrease rate of a combustion air supply amount is controlled at the time of a fire extinguishing operation, and a decrease rate of a liquid fuel supply amount is controlled,
2. The liquid fuel combustion apparatus according to claim 1, further comprising a control circuit that equalizes the reduction rates of the liquid fuel supply amount and the combustion air supply amount. 7. A constant oil leveler for constantly storing a fixed amount of liquid fuel,
A pump for pumping liquid fuel to the constant oil leveler, a fuel supply means having a pressure pipe for applying the blowing pressure of the combustion air to the constant oil leveler to supply the fuel, a combustion blower for supplying the combustion air, and A vaporization chamber for vaporizing the supplied liquid fuel, a flame hole for burning a premixture of the vaporized liquid fuel and the supplied combustion air, and a control circuit for controlling the fuel supply means and the combustion blower. A liquid fuel combustion device equipped with. 8. At least one of the fuel supply means and the combustion blower is controlled so that the liquid fuel supply amount and the combustion air supply amount decrease rate at the time of the fire extinguishing operation are equalized, and the flame hole is free of flame. 8. The liquid fuel combustion apparatus according to claim 1, further comprising a control circuit for controlling the blower for combustion so as to cause the unburned gas in the vaporization chamber to flow backward. 9. A fuel supply means for supplying a liquid fuel, a combustion blower for supplying combustion air, a vaporization chamber for vaporizing the supplied liquid fuel, and the vaporized liquid fuel and the supplied combustion air. , A combustion chamber arranged to cover the flame formed in the flame, the combustion gas from the combustion chamber and air are mixed and diffused into the chamber during normal operation. At the same time, after the extinction, a convection fan that applies the pressure of the airflow to the combustion chamber so that the pressure outside the combustion chamber is higher than the pressure inside the combustion chamber, and the reduction rate of the liquid fuel supply amount and the combustion air supply amount during the fire extinguishing operation. A liquid fuel combustion apparatus comprising: a control circuit that controls at least one of the fuel supply unit and the combustion blower so as to equalize them. 10. A casing provided with a warm air outlet for covering the combustion chamber and the convection fan and discharging hot air sent from the convection fan, and an opening / closing provided at the warm air outlet for closing the fire The liquid fuel combustion apparatus according to claim 9, further comprising a mechanism. 11. A control circuit for controlling the suction device so as to suck the unburned gas in the vaporization chamber after the flame has disappeared from the flame, the control circuit being provided with the control circuit. Liquid fuel combustion device as described. 12. A convection fan provided with a discharge port which is installed at a position apart from a suction port and discharges unburned gas that has been sucked or backflowed. Liquid fuel combustion device. 13. The liquid fuel combustion apparatus according to claim 8, further comprising an adsorbent installed in a discharge path of the unburned residual gas that is sucked or flows backward. 14. The liquid fuel combustion apparatus according to claim 8, further comprising an exhaust gas purifying catalyst installed in a discharge path of the unburned unburned residual gas. 15. A fuel tank for storing liquid fuel, two branch pipes connecting the fuel tank with a combustion air blower path connecting a combustion blower and a vaporization chamber, and installed in the middle of each branch pipe. 12. A path switching device, and a control circuit for controlling the path switching device during a fire extinguishing operation so as to guide backflow unburned gas to the fuel tank. The liquid fuel combustion apparatus according to item 1. 16. The liquid fuel according to claim 8, further comprising a fuel tank for storing the liquid fuel, and a suction device for sucking unburned gas and guiding it to the fuel tank. Combustion device.