JPH0828820A - Liquid fuel burning equipment - Google Patents

Abstract

PURPOSE:To obtain liquid fuel burning equipment which reduces an offensive smell caused by thermal decomposition of an unburnt fuel gas at the time of extinction. CONSTITUTION:A fuel vaporizing part (vaporizer 4) and a burning part (burner 6) are separated from each other and, in this structure, a sucking means 10 is provided in connection with the burner 6 being the burning part. At the time of extinction, operations of a convection blower 9 and an oil feed pump 3 for feeding fuel are stopped and a fuel jet nozzle 5 of the vaporizer 4 is closed after a prescribed time so as to stop jetting of a fuel gas, while a smell sucking fan 12 of the sucking means 10 is made to operate in the state of stop of the convection blower 9 so as to suck an unburnt fuel gas directly from the burner 6. Particularly, a suction port of the sucking means 10 is connected to a burner throat part 20 of the burner 6.

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 such as a petroleum fan heater that vaporizes kerosene in a vaporizer, ejects it from a nozzle and burns it in a burner, and more particularly to reducing odors when extinguishing a fire.

[0002]

2. Description of the Related Art A wick type oil stove and a vaporization type oil fan heater will be described below as an example of a deodorizing mechanism of a conventional liquid fuel combustion apparatus with reference to the drawings. 3A and 3B are cross-sectional views for explaining the deodorizing mechanism of the core type oil stove, wherein FIG. 3A shows the state during combustion, and FIG. 3B shows the state during extinguishing.
The arrows in the figure represent the flow of gas.

During combustion, the wick 21 projects into the burner 22, and fuel is sucked from the lower part of the wick 21 and the fuel gas vaporized by the combustion heat at the upper end of the wick 21 is burner 22.
It rises inside and burns. At this time, the flow of fuel gas is always in the direction from the core 21 to the burner 22. On the other hand, when extinguishing the fire, the odor absorbing fan 23 is rotated simultaneously with the extinguishing operation of the stove. The core 21 is burner 22 by the fire extinguishing operation.
Although it retreats to the lower part, the fuel slightly evaporates from the upper end of the core 21 due to the residual heat of the burner 22, and it flows into the burner 22 and is decomposed by the heat of the burner 22 and causes an odor, so the odor absorbing fan 23 causes the fuel to burn. The gas is sucked into the fuel tank 25 so as not to flow into the burner 22 side.

Next, the vaporization type oil fan heater will be described. 4 (a) is a schematic structural sectional view for explaining the configuration of a main part related to combustion of a general vaporization type oil fan heater, FIG. 4 (b) is a side sectional view of the overall configuration, and FIG. ) Is an operation time chart of each component when extinguishing a fire. During combustion, the fuel supplied from the refueling tank 1 is temporarily stored in the oil receiving tray 2 and sent to the carburetor 4 by the oil feeding pump 3 in FIG. 4A. The vaporizer 4 is maintained at a high temperature, and the fuel gas vaporized in the vaporizer 4 is ejected from the nozzle 5 which is a fuel ejection port of the vaporizer to the burner 6, and the cross-sectional area inside the burner 6 is narrowed down. A burner throat section 20
Due to the Venturi effect, the sucked air is mixed in the burner 6 and burned in the upper portion of the burner 6. The nozzle 5 has a hole that can be opened and closed by a needle (not shown) driven by a solenoid valve 7.

In FIG. 4 (b), the burner 6 is surrounded by a furnace 8 for stabilizing the flame, and the hot air discharged from the upper part of the furnace 8 is mixed with the indoor air taken in by the convection blower 9 and the outside of the apparatus. Is released to. On the other hand, when the fire is extinguished, each part is controlled according to the time chart of FIG. First, at the time point T2 of the fire extinguishing operation of the device, the oil feeding pump 3 is stopped, and at the same time, the convection blower 9 is also braked to stop the rotation. At this time, since the fuel gas remains in the vaporizer 4, it is gradually ejected from the nozzle 5 and burned by the burner 6. Then, after a lapse of a certain time t2, the nozzle 5 is closed to stop the ejection of the fuel gas and completely extinguish the flame. When the unburned fuel gas remaining in the vaporizer 4 or the burner 6 is discharged into the furnace 8, the odor of the vaporization type oil fan heater at the time of extinguishing is decomposed by the residual heat of the burner 6 or the furnace 8 and becomes an intermediate product. It is caused by changes, and by gradually reducing the fuel injection from the nozzle 5 and gradually narrowing the combustion so as not to let these go out of the device, by eventually stopping the fuel injection and stopping the combustion, We are trying to reduce the release of unburned fuel gas as much as possible.

However, it is very difficult for the conventional vaporization type oil fan heater to completely burn the unburned gas remaining in the burner at the time of fire extinguishing so as not to leak to the outside of the apparatus. At present, a slight pungent odor is generated due to thermal decomposition of combustion gas. FIG. 5 shows a cross-sectional view of the essential part of an example (see Japanese Utility Model Laid-Open No. 3-87015) in which an evaporation type oil fan heater is equipped with a suction means 30 for sucking unburned fuel gas remaining at the time of extinguishing and deodorizing. ing. FIG. 5 (a) shows during combustion when the suction means is not operating, and FIG. 5 (b) shows when fire is extinguished while the suction means is operating, and the arrows show the flow of gas.

The operation of each component in FIG. 5 is the same as that described with reference to FIG. 4, but a primary air path 35 is provided between the nozzle 5 and the burner 6, and a suction pipe 31 and an odor absorbing fan 32 are provided in an intermediate portion thereof. A suction motor 30 including a drive motor 33 for driving the odor absorbing fan 32 and an exhaust pipe 34 is provided. During combustion shown in FIG. 5 (a), fuel gas is jetted from the nozzle 5 to the burner 6, and the combustion air is sucked by the Venturi effect of the burner throat section 20 (see FIG. 4 (a)).
Flows in the primary air path 35 in the direction of the arrow.

Next, the operation for extinguishing the fire shown in FIG. 5 (b) will be described. When extinguishing the fire, the oil feeding pump 3 is stopped at the time point T when the fire extinguishing operation of the apparatus is started, and at the same time, the convection blower 9 (see FIG. 4B) is also braked to stop the rotation. At this time, since the vaporizer 4 is filled with vaporized fuel gas, the solenoid valve 7 is operated to close the nozzle 5 and stop the ejection of fuel gas. Simultaneously with closing of the nozzle 5, the drive motor 33 rotates the odor absorbing fan 32. For this reason, the unburned fuel gas remaining in the burner 6 after extinguishing is sucked by the odor absorbing fan 32 and flows in the primary air path 35 in the direction of the arrow in the direction opposite to the direction in which the combustion is being performed. (See Fig. 4 (b)). The operation at the time of extinguishing the fire will be described by diverting the time chart of FIG. 2 into a time chart of t = 0 in which a certain time t is omitted from FIG.

Even in the case of FIG. 5 in which the suction means for sucking and deodorizing the unburned fuel gas remaining at the time of extinguishing the vaporization type oil fan heater is provided as described above, the remaining unburned fuel in the burner is as follows. For the purpose of sucking gas, the suction effect is reduced. Since the odor absorbing fan 32 is provided in the intermediate portion of the primary air path 35 between the nozzle 5 and the burner 6, not only the residual unburned gas in the burner is sucked during the operation of the suction means, but the primary air, Suck some air outside the primary air path. Further, at the time T when the fire extinguishing operation of the apparatus is started, the driving motor 33 is immediately started, and the unburned fuel gas remaining in the burner 6 is started to be sucked by the rotation of the odor absorbing fan 32. The residual unburned gas in the burner, which should be burned by the burner as it is, is also sucked.
(At the time T when the fire extinguishing operation of the device is started, the nozzle 5 is closed and the ejection of the fuel gas is stopped, so it is considered to be harmless, but if strongly sucked, there is a risk of flashback and explosion, and the suction force is adjusted. 6 and 7 are cross-sectional views of the main part of another conventional example disclosed in Japanese Patent Publication No. 62-42021. First, the fuel system will be described with reference to FIG. 6 for explaining the combustion and FIG. 7 for explaining the extinction. Reference numeral 41 denotes a fuel tank, and liquid fuel is sent to a fuel supply section 43 by a pump 42. 44
Is an overflow type constant oil level device, and excess fuel is returned to the fuel tank 41 through the return passage 45. 46
Is a porous body, the lower end portion of which is immersed in the fuel of the fuel supply portion 43, and sucks the fuel into the fuel vaporization portion 47 of the upper end portion. Four
A heating element 8 is provided in the vicinity of the fuel vaporization section 47, and generates heat by energization to give the heat required for vaporization to the fuel vaporization section 47.

Next, the air system will be described. 49 is an air supply port, 50 is an air blower, 51 and 52 are air blow pipes, 53 is a switching pipe, and 54 and 55 are valves. In addition, a large number of small holes are provided in a portion of the blower pipe 51 facing the fuel vaporization section 47. The arrows shown in FIGS. 6 and 7 indicate the air flow directions during combustion and extinguishing fire.

Next, the combustion system will be described. Reference numeral 56 is a lower mixing chamber, and 57 is an upper mixing chamber. The fuel vaporized from the fuel vaporizing section 47 and the air supplied from the blower pipes 51 and 52 are sufficiently mixed in the both mixing chambers 56 and 57, and then the flame mouth portion. It is configured to pass through 58 and burn in the combustion space 59. In addition, 60 is a partition plate having a plurality of small holes, 61 is a partition chamber, and the air that has entered the blower tube 52 partition chamber 61 is configured to be introduced into the lower mixing chamber 56 from the small holes of the partition plate 60. There is. Further, 62 is an outlet. FIG. 7 shows the air flow direction at the time of fire extinguishing and the positions of the valves 54, 55 in the embodiment of FIG. 6, in comparison with the air flow direction at combustion and the valves 54, 55 shown in FIG. It is shown for easy understanding.

The ignition method of this conventional example is based on the pump 4
2. By energizing a high intermittent discharge igniter (not shown) provided in the vicinity of the heating element 48, the blower 50, and the flame port 58, and setting the positions of the valves 54 and 55 to the state shown in FIG. Done. Further, the extinguishing method is to stop the above-mentioned energization and the valve
55 is performed by setting the state of FIG. This time,
The blower 50 has its drive power cut off, but continues to be driven for a while due to the inertial force, whereby the gas flows in the direction of the arrow shown in FIG. 7. In the case of this conventional example, when the blower 50 is operated as a suction device at the time of extinguishing fire, a backfire from the combustion space 59 to the mixing chambers 56, 57 is caused and the suction amount is appropriately adjusted to eliminate the risk of explosion. It is necessary to design.

Blower pipes 51 and 52, which serve as suction passages, are connected to a fuel vaporizing section 47. In the fuel vaporization section 47, the heating element 48 and the porous body 4 that sucks up the fuel even after the extinguishing operation are performed.
Since the residual liquid fuel in the carburetor stored in the fuel supply section 43 is vaporized in a large amount due to the residual heat of 6, the fuel vaporization section 4
The pressure at 7 remains high. Therefore, in order to completely remove the odor, it is necessary to suck the residual vaporized gas in the upper mixing chamber 57, but since the pressure of the fuel vaporizing section 47 is high, the suction from the fuel vaporizing section 47 causes the mixing chamber 57 to be sucked. The suction efficiency of the inside is low, and it goes out from the mixing chamber 57 to the combustion space 59 and eventually leaks to the outside of the equipment.

Further, in this structure, the fuel supply section 43 is provided after the fire is extinguished.
Although the fuel is supplied for a while after the fire is extinguished due to the vaporization of the residual liquid fuel in the carburetor stored in the interior of the carburetor, the fuel is vaporized from the fuel vaporization part 47 through the blower pipes 51 and 52, so that the combustion chamber 59 is discharged from the combustion space 59. Properly designing the suction amount in order to eliminate the risk of explosion by causing a backfire to 56 and 57 brings about a vicious circle in which the suction effect is reduced.

Japanese Patent Publication No. 62-14721 discloses that air is jetted into a space in order to suppress the flashback. FIG. 8 shows a cross-sectional view of the main parts for explaining the extinguishing of the fire in this conventional example. Since the configuration of the conventional example shown in FIG. 8 is largely the same as that of the conventional example shown in FIGS. 6 and 7, detailed description of each configuration of the conventional example shown in FIG. 8 is omitted. 6, the same reference numerals as those in FIG. 7 are attached.
Here, a particularly different point is that a fuel component processing device 65 is provided in an intermediate portion of the blower pipe 51 of FIG. 7 that serves as a suction path of the suction device, and a jet air chamber 66 and a jet slit 64 are provided in the combustion portion. A blower pipe 67, which serves as an air ejecting device that ejects air into the chamber 66, is connected to the suction device as shown in FIG.
It is newly provided between the discharge port 62 and the jet air chamber 66.

FIG. 8 shows the direction of air flow and the valve 54 when extinguishing a fire.
55 shows the position of 55. When the blower 50 operates as a suction device at the time of fire extinguishing, air is blown from the blower pipe 67 to the jet air chamber 66 as shown in FIG. 8, and if the jet amount of air is made larger than the suction amount. No flame is drawn in from the flame mouth portion 48, and flashback does not occur. In addition,
To surely increase the amount of ejected air more than the amount of suction, it is preferable to provide an air suction hole 68 as shown in FIG.

Further, since the fuel component sucked into the blower pipe 51 serving as a suction device is processed by the fuel component processing device 65, the suction fluid passing through the fuel component processing device 65 contains almost no air but only the air. Even if this is supplied to the combustion section, incomplete combustion or thermal decomposition of the fuel component is caused, so that it is not transformed into an odor component and is not discharged to the outside. Further, the fuel component sucked into the suction device during fire extinguishing is almost limited to that before starting the combustion reaction, and the fuel component that has already started the combustion reaction is hardly sucked.

Although the conventional example of FIG. 8 is configured as described above, when the air is ejected to the combustion section in this manner, the air blow pipe 67 serving as a jet pipe and the air blow pipes 51 and 52 serving as suction pipes are formed. The vaporized gas circulates between them, and the vaporized gas suction efficiency of the upper mixing chamber 57 further decreases. First of all, the unburned gas existing in the upper mixing chamber 57 at the time of extinguishing may of course be burned as it is, but the lean unburned gas is not burned but is discharged as it is through the flame port 58, and the high temperature portion is discharged. It is heated by the heat from and converted into aldehyde and the like, generating an extremely strong odor. That is, the unburned gas existing in the upper mixing chamber 57 is jetted air, and thus is not sucked by the suction device and is discharged from the flame opening 58.

Next, regarding the fuel component processing device, it is difficult to complete it only by reliquefaction by cooling. Therefore, it is necessary to capture the fuel component by using a filter or an adsorbent or burn it with a catalyst. Maintenance is also difficult. In the case of this device, if the processing of this fuel component processing device is insufficient,
The fuel component is ejected, and a part of the fuel component leaks from the flame opening 58. Further, in the case of this device, the blower tubes 51, 5
In addition to 2, 67, it is a complicated device such as switching of valves 54, 55.

Next, a device for reducing odor generation during digestion of an oil burning device disclosed in Japanese Utility Model Laid-Open No. 2-77461 will be described with reference to FIG. In FIG. 10, oil in a petroleum tank (corresponding to an oil pan in the embodiment of the present invention) is supplied to a carburetor by the operation of an electromagnetic pump (corresponding to an oil feed pump in the embodiment of the present invention) and vaporized. A burner and an oil tank in an oil combustion device that ejects gas to the burner with an ejection nozzle to perform combustion, stops the operation of the electromagnetic pump at the same time as turning off the operation switch, and returns the petroleum gas from the vaporizer to the oil tank through the ejection nozzle. And an exhaust mechanism (which corresponds to the suction means in the embodiment of the present invention) for sucking the petroleum gas in the burner and returning it to the oil tank, and a nozzle for closing the ejection nozzle after a predetermined time has elapsed since the operation switch was turned off. An oil burning device is described that includes a closing part and an exhaust control part that stops the operation of the discharge mechanism after the operation switch is turned off.

In the following description, the terms used in the embodiments of the present invention will be described. In FIG. 10, the burner 6 and the oil pan 2
The suction pipe 37, the exhaust pump 38, and the exhaust pipe 39 in the middle part of the
The operation of each component during combustion and at the time of digestion is the same as that described with reference to FIGS. 4 and 5. Although the operation of the convection blower at the time of extinguishing is not particularly mentioned, the convection blower is parallel to the exhaust pump 38 of the suction means 36, judging from the electric circuit diagram of FIG. 2 disclosed in Japanese Utility Model Laid-Open No. 2-77461. Is connected to a power source so that the convection blower is always energized when the exhaust pump 38 is energized to operate the suction means 36. That is, when operating the suction means 36, the convection blower is also operating.

The convection blower takes indoor air into the combustor and mixes it with hot air generated by the combustion heat emitted from the furnace (shown by reference numeral 8 in FIG. 4B) to generate warm air outside the combustor. Although it is for blowing out, when the convection blower rotates and blows air, the blowing force acts so that the gas in the furnace 8 is sucked from the inside of the furnace 8. Therefore, if the convection blower is not stopped during the digestion, the burner 6 to the furnace 8
Unburned vaporized gas is sucked into the interior. When this unburned fuel gas comes into contact with the high temperature body inside the furnace 8, it becomes an odor component. When trying to suck the unburned fuel gas remaining in the burner 6 by operating the suction means 36 at the time of extinction, the suction force of the suction means 36 is offset by the suction force from the burner 6 into the furnace 8 by the convection blower. There is a problem that the effect decreases.

Further, there are conventional examples disclosed in JP-A-52-37233, JP-B-54-1934, JP-B-54-3243 and JP-B-62-81814, but FIG. , Japanese Patent Publication Sho-62-42 explained in FIG.
Since the fuel is sucked from the vaporizing portion as in the case of JP 201, the suction efficiency is lowered, and there is a risk that the fuel accumulated at the bottom of the carburetor at the time of fire extinguishing may backfire.

[0024]

As described above, in the above-mentioned prior art, since the fuel vaporization section and the combustion section are integrally and spatially connected, the suction from the vaporization section exists in the combustion section at the time of extinguishing the fire. Sucking efficiency of unburned gas is poor. Further, since a large amount of the residual fuel is vaporized when the fire is extinguished and it is attempted to suck it, there is a problem of fear of flashback and a process for preventing a large amount of vaporized gas after the suction from leaking to the outside of the main body. Furthermore, in order to improve the suction efficiency of the residual gas in the burner, it is necessary to stop the convection blower during the digestion. In this way, it is very difficult to completely burn the unburned gas remaining in the burner at the time of fire extinguishing, or to suck it and prevent it from leaking to the outside of the device. At present, a slight irritating odor is generated due to thermal decomposition. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid fuel combustion apparatus in which generation of odor due to thermal decomposition of unburned gas during fire extinguishing is suppressed.

[0025]

In order to achieve the above object, the liquid fuel combustion apparatus according to the present invention has the following features.
A vaporizer for vaporizing the supplied liquid fuel, a burner that mixes the vaporized fuel with air and burns it, and indoor air is taken into the combustor, and the hot air burned at the upper part of the burner is burned from inside the furnace surrounding the burner. A convection blower for sucking and mixing the hot air with the taken-in room air and discharging it to the outside of the combustion device, and installed to connect with the burner so as to directly suck the unburned fuel gas in the burner when extinguishing the fire. And a suction means for sucking the liquid fuel, wherein the convection fan is stopped at the time of extinguishing, and the operation of the suction means is started in a state where the convection fan is stopped. The invention according to claim 2 has a structure in which the suction port of the suction means according to claim 1 is connected to the burner throat portion of the burner.

Further, according to a third aspect of the present invention, the operation of the fuel supply oil pump is stopped at the starting point T of the fire extinguishing operation of the apparatus, and after a lapse of a predetermined time t from the starting point T of the extinguishing operation, the fuel injection of the carburetor is started. The liquid fuel fuel apparatus according to claim 1 or 2, wherein the nozzle is closed to stop the ejection of the fuel gas and the suction means is operated.

[0027]

The liquid fuel combustion apparatus of the present invention has the above-mentioned structure. The invention according to claim 1 stops the convection blower when extinguishing a fire.
Stop the suction of unburned fuel gas remaining inside the burner by the convection blower through the furnace, and suck the unburned fuel gas remaining inside the burner directly to the outside of the burner by the suction means installed connected to the burner. By doing so, the unburned fuel gas does not flow into the high temperature furnace, and the generation of odor can be suppressed, and the unburned fuel gas is directly sucked from the burner, so the suction efficiency is also high.

Further, the structure in which the fuel vaporization section and the combustion section are separated, for example, the Bunsen system, sucks unburned fuel gas from the combustion section, so that the suction amount can be the internal capacity of the burner, so that the suction efficiency is high. The subsequent vaporized gas treatment is also easy. Further, after the fire is extinguished, the fuel supply to the burner (burning section) can be completely stopped, so there is no danger of flashback. Further, according to the invention described in claim 2, since the burner throat portion has a negative pressure than the internal pressure of the apparatus due to the Venturi effect, if the intake port of the suction means is connected to the burner throat portion, the suction means during combustion. The air flowing through the intake port of the air flows from the outside of the burner to the inside of the burner, and the vaporized fuel inside the burner does not leak outside the burner.

Further, according to the third aspect of the invention, at the time T when the fire extinguishing operation of the apparatus is started, the operation of the fuel supply oil pump is stopped to stop the liquid fuel from being sent to the carburetor, and the carburetor is already filled. The vaporized gas is ejected from the fuel ejection nozzle of the vaporizer and burned. After a lapse of a predetermined time t from the time T at which the fire is extinguished, the vaporized gas is almost completely burned, and the remainder becomes a lean unburned fuel gas that is difficult to burn. Therefore, the fuel jet nozzle of the vaporizer is closed to stop the jet of fuel gas. Let Also, when the fire is extinguished, the convection blower is stopped, suction of unburned fuel gas remaining inside the burner by the convection blower is stopped through the inside of the furnace, and the suction means connected to the burner is operated to directly remove the air inside the burner. By sucking the combustion fuel gas, the unburned fuel gas does not flow into the high-temperature furnace, and the deodorization is efficiently performed.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, when one embodiment of the liquid fuel combustion apparatus of the present invention is applied to a liquid fuel vaporization type combustion apparatus such as an oil fan heater, the same components as those described in the above conventional example are designated by the same reference numerals. And explain. The liquid fuel combustion apparatus of the present invention is configured as shown in FIG. 1. FIG. 1 is a schematic configuration diagram of a main part of the combustion apparatus, and FIG. 2 is a time chart of main components when the combustion apparatus of FIG. 1 is extinguished. Is. FIG. 4 (a) is a schematic structural sectional view for explaining the configuration of the main structure related to combustion of a general vaporization type oil fan heater, and FIG. 4 (b) is a side sectional view of the overall configuration.

During combustion, as shown in FIG. 4A, the fuel supplied from the oil supply tank 1 is temporarily stored in the oil receiving tray 2 and sent to the carburetor 4 by the oil sending pump 3. The vaporizer 4 is kept at a high temperature, and the fuel gas vaporized in the vaporizer 4 is vaporized in the vaporizer 4.
From the nozzle 5 which is the fuel outlet of the burner 6 and is mixed in the burner 6 with the air sucked by the venturi effect of the burner throat portion 20 which is a portion where the cross-sectional area in the burner 6 is narrowed down. Burns at the top. The nozzle 5 has a hole that can be opened and closed by a needle (not shown) driven by a solenoid valve 7. FIG.
In (b), the burner 6 is surrounded by the furnace 8 to stabilize the flame, and the hot air discharged from the upper part of the furnace 8 is mixed with the indoor air taken in by the convection blower 9 and discharged to the outside of the apparatus.

In FIG. 1, a suction pipe 11 connected to the burner throat portion 20 below the burner 6 in the combustion portion as an intake port, an odor absorbing fan 12 for sucking unburned residual gas in the burner 6 during extinguishing, There is a drive motor 13 for driving the odor absorbing fan 12, and an exhaust pipe 14 for exhausting residual gas from the odor absorbing fan 12 using a space above the liquid fuel surface in the oil pan 2 as an exhaust port 15.
2, the suction means 1 by the drive motor 13 and the exhaust pipe 14
0 is configured.

The operation of the liquid fuel combustion apparatus of the present invention configured as described above at the time of extinguishing a fire will be described with reference to FIGS. During the combustion, the liquid fuel sent to the vaporizer 4 is vaporized and ejected from the nozzle 5 toward the burner 6, the fuel gas and the primary air for combustion are mixed in the burner 6, and burned on the upper surface of the burner 6. The gas flow in the suction means 10 is from the oil pan 2 to the burner 6. At the time of extinguishing the fire, the oil feeding pump 3 is stopped at the time point T of starting the fire extinguishing operation of the device, and at the same time, the convection blower 9 is also braked to stop the rotation. At this time, since the fuel gas remains in the vaporizer 4, it is gradually ejected from the nozzle 5 and burned by the burner 6. After a lapse of a predetermined time t, the solenoid valve 7 is operated to close the nozzle 5 and stop the ejection of fuel gas. The predetermined time t may be changed depending on the combustion state before extinguishing the fire. For example, when the fire is extinguished in a combustion state of strong combustion and a large fuel supply amount, it is long, and when it is extinguished in a combustion state of a small combustion amount and a small fuel supply amount, it is shortened. This is because the time until the residual unburned fuel gas burns out depends on the previous combustion state. Using a control device that uses a one-chip microcomputer, the combustion state is caught, and a predetermined time t
The value of should be decided.

In addition to stopping the convection blower 9, in addition to the purpose of preventing the cold air from blowing out after stopping the normal combustion, the suction of gas from the inside of the furnace 8 by the blowing of the convection blower is stopped, The lean fuel gas is prevented from being sucked into the furnace 8 from the burner 6 without burning. In the unlikely event that unburned fuel gas is released and is thermally decomposed by the residual heat of the burner 6 and the furnace 8 to become an odorous component and released from the furnace 8,
It also has the effect of preventing these from leaking and spreading. At the same time when the nozzle 5 is closed, the odor absorbing fan 12 is rotated by the drive motor 13. The unburned fuel gas in the burner 6 is sucked by the odor absorbing fan 12 from the suction pipe 11 connected to the burner throat section 20, and flows into the space in the oil pan 2 via the exhaust pipe 14. Therefore, the unburned fuel gas in the burner 6 does not leak to the outside of the device through the furnace 8 as in the conventional case, so that the odor at the time of extinguishing can be reduced.

The position of the suction port of the suction means installed in connection with the burner will be described in detail below. In the conventional example shown in FIG. 10, the intake port of the suction pipe 37 is installed at the vaporized gas introduction port 40 on the fuel injection nozzle 5 side of the carburetor from the burner throat section 20 of the burner 6. This is rather close to an example in which the suction pipe 31 is provided in the intermediate portion of the primary air path 35 between the nozzle 5 and the burner 6 in the conventional example of FIG. Not only the unburned gas is sucked, but also the primary air is sucked, which reduces the suction efficiency.

On the contrary, let us consider a case in which the suction port of the suction means is provided closer to the burner 6 than the burner throat 20 of the burner 6. The burner 6 mixes the fuel jet from the nozzle 5 of the carburetor 4 and the primary air that is attracted to it and becomes a negative pressure to be sucked, and burns at the upper part of the burner. Therefore, as shown in FIG. Becomes a mixing tube and folds back to guide the combustion gas to the upper combustion section. As shown in the burner 6 of FIG. 4 (a), the burner 6 may be vertically divided. If an intake port is provided at the end of the mixing tube on the side opposite to the nozzle side, the residual unburned gas in the burner will be efficiently sucked during operation of the suction means, but this time pressure will be applied during combustion. There is a problem that a part of the combustion gas leaks from the intake port to the suction means side.

When the burner throat portion 20 is provided with the suction port of the suction means as in the present invention shown in FIG. 1, the burner throat portion 20 becomes a negative pressure than the internal pressure of the apparatus due to the Venturi effect, and therefore the suction means during combustion. The air flowing through the intake port of the air flows from the outside of the burner to the inside of the burner,
The vaporized fuel inside the burner does not leak outside the burner. On the contrary, since the vaporized fuel gas floating in the oil receiving tray is sucked into the burner, the vaporized fuel gas in the oil receiving tray is prevented from leaking to the outside of the device during combustion, and the odor during combustion can be reduced.

According to the data obtained by enclosing the entire apparatus at the time of fire extinguishing with a box and measuring the unburned fuel gas leaking from the apparatus by the amount of hydrocarbons, the method of the present invention is the method of the conventional example described in FIG. 4 (c). That is, without using the suction means of the present invention, the oil feeding pump 3 and the convection blower 9 are stopped at the time T2 of the fire extinguishing operation of the apparatus,
It was possible to reduce the amount of hydrocarbons by about 30% as compared with the method in which the nozzle 5 was closed after the elapse of a certain time t2 to stop the injection of the fuel gas and extinguish the fire. The burner 6 and the vaporizer 4
The structure of the suction means 10 and the suction means 10 are not limited to those of the present embodiment, and any structure may be used as long as they have similar functions. Further, the closing of the nozzle 5, the stop of the convection blower 9, the operation timing of the odor absorbing fan 12, etc. are not limited to those in the present embodiment, and any operation that has the same operational effect may be used.

[0039]

Since the liquid fuel combustion apparatus of the present invention is configured as described above, in the invention of claim 1, the rotation of the convection blower is stopped at the time of extinction, and the unburned fuel gas in the burner is discharged from the burner. The unburned fuel gas in the burner is efficiently sucked at the time of fire extinguishing by the suction means for directly sucking,
It is possible to prevent the residual gas in the burner from leaking to a high temperature portion outside the burner. Therefore, it reduces odor when extinguishing fire, and
Since the gas flow in the burner is opposite to that during combustion, fire extinguishing performance is improved. Further, in the invention according to claim 2, the intake port of the suction means is connected to the burner throat portion of the burner. However, since the burner throat portion has a negative pressure than the internal pressure of the device due to its Venturi effect, the suction means during combustion. The air flowing through the portion becomes a flow from the outside of the burner to the inside of the burner, and the vaporized fuel inside the burner does not leak outside the burner. Further, since the vaporized fuel gas floating in the oil receiving tray is sucked into the burner, it is possible to prevent the vaporized fuel gas in the oil receiving tray from leaking to the outside of the device during combustion, and the odor during combustion can be reduced.

According to the third aspect of the present invention, after the fuel supply is stopped at the time T when the extinguishing operation of the apparatus is started and a predetermined time has elapsed, the remaining vaporized gas is almost completely burned, and the rest is a lean unburned gas which is difficult to burn. When it becomes fuel gas, the fuel injection nozzle of the vaporizer is closed to stop the injection of fuel gas. When the fire is extinguished, the convection blower is stopped, and suction of unburned vaporized fuel remaining inside the burner by the convection blower is stopped through the inside of the furnace, and the suction means connected to the burner is operated to directly remove the unburned gas inside the burner. By sucking the combustion fuel gas, the unburned fuel gas does not flow into the high-temperature furnace, and the deodorization is efficiently performed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a main part of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a time chart of main components when the combustion apparatus of FIG. 1 is extinguished.

FIG. 3 is a cross-sectional view of a main part for explaining a deodorizing mechanism of a conventional core-type petroleum stove, in which (a) shows burning and (b) shows extinguishing, and arrows in the figure show gas flows. Shows.

4A and 4B are views for explaining a general vaporization type oil fan heater, in which FIG. 4A is a schematic structural sectional view showing a configuration of a main part related to combustion, and FIG. 4B is a side sectional view of an apparatus (overall configuration). Figure, (c)
[Fig. 3] is a time chart of each component when extinguishing a fire in a conventional example.

FIG. 5 is a sectional view of an essential part of a vaporization type oil fan heater provided with a suction means for deodorization of a conventional example disclosed in Japanese Utility Model Laid-Open No. 3-87015, in which (a) the suction means is operating. During non-combustion, (b) represents the time of extinguishing when the suction means is operating, and the arrow in the figure indicates the flow of gas.

FIG. 6 is a cross-sectional view of a main part configuration for explaining the combustion of the conventional example shown in Japanese Patent Publication No. 62-42021.

FIG. 7 is a cross-sectional view of a main part configuration for explaining a case of extinguishing a fire in FIG.

FIG. 8 is a cross-sectional view of a main part configuration for explaining a conventional example of extinguishing a fire as disclosed in Japanese Patent Publication No. 62-14721.

9 is a cross-sectional view of a main part of the liquid fuel fuel device in the conventional example of FIG.

FIG. 10 is a cross-sectional view of a main part of a vaporization type petroleum fan heater provided with a conventional deodorizing suction means disclosed in Japanese Utility Model Laid-Open No. 2-77461.

[Explanation of symbols]

 2 oil pan 3 oil pump 4 vaporizer 5 (fuel jet of vaporizer) nozzle 6 burner 7 solenoid valve 8 furnace 9 convection blower 10, 30, 36 suction means 11, 31, 37 suction pipe 12, 23, 32 odor fan 13, 24, 33 Drive motor (for odor absorbing fan) 14, 34, 39 Exhaust pipe 15 Exhaust port 20 (For burner) Burner throat section

Claims (3)

[Claims] 1. A carburetor for vaporizing the supplied liquid fuel, a burner for mixing the vaporized fuel with air for combustion, and indoor air taken into the interior of the combustion device to convert hot air burned at the upper part of the burner into a burner. Suction from inside the surrounding furnace,
A convection blower for mixing the hot air with the taken-in room air and discharging it to the outside of the combustion device, and a suction means connected to the burner so as to directly suck the unburned fuel gas in the burner when extinguishing the fire. A liquid fuel combustion apparatus having: a liquid fuel combustion apparatus, wherein the convection blower is stopped at the time of extinguishing, and the operation of the suction means is started in a convection blower stopped state. 2. The liquid fuel combustion apparatus according to claim 1, wherein the suction port of the suction means is connected to the burner throat portion of the burner. 3. A fire extinguishing operation start time point T when operation of a fuel supply oil pump is stopped at a fire extinguishing operation start time point T of the apparatus.
The liquid fuel according to claim 1 or 2, wherein after a lapse of a predetermined time t, the fuel injection nozzle of the vaporizer is closed to stop the injection of the fuel gas and the suction means is operated. Combustion device.