JP2538353B2 - Extinguishing method of combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention supplies liquid fuel to a rotating body provided in a vaporization chamber and vaporizes the fuel atomized by the rotating body in the vaporization chamber. The present invention relates to a fire extinguishing method for a combustion device that mixes with combustion air and combusts a mixed gas in a combustion section.

(B) Conventional technology When this type of combustion device is used in an open combustion device such as an oil fan heater or an oil radiant heater, it has a drawback that a bad odor is emitted indoors during a fire extinguishing operation. The cause of the foul odor is that the liquid fuel such as kerosene remains attached to the fuel scattering rotor during digestion, and the liquid fuel that remains attached to the fuel scattering rotor gradually vaporizes This is because the gas remains in the vaporization chamber, and when it contacts a high temperature combustion part such as a burner head, it changes into a gas having a strong malodor.

Therefore, in the one disclosed in JP-A-63-223452, a convection fan for discharging warm air during a fire extinguishing operation and a damper device are used to guide unburned gas in the vaporization chamber to an oil sump tank, The unburned gas is prevented from coming into contact with the combustion section. However, in the case of an oil radiation heater without a convection fan, a fan for collecting gas must be provided separately. Further, in order to prevent the generation of a bad odor, it is necessary to sufficiently recover the gas, which is a time-consuming problem.

(C) Problem to be Solved by the Invention The present invention has been made in view of the above-described facts, and it is possible to suppress the generation of a foul odor immediately after extinguishing a fire without separately requiring a fan such as a convection fan. The purpose is to do.

(D) Means for Solving the Problems In the present invention, the air supply passage, the air supply fan provided in the air supply passage, the vaporization chamber to which the combustion air is supplied by the air supply fan, and the vaporization A fuel scattering rotor provided in the chamber, a motor for driving the fuel scattering rotor and the air supply fan, fuel supply means for supplying liquid fuel to the fuel scattering rotor, and fuel vaporized in the vaporization chamber. And a combustion section for burning a mixed gas of combustion air, and a normally-open electric shutter device provided in the air supply passage upstream of the air supply fan, and continuously operates the motor for a predetermined time during a fire extinguishing operation, In addition, the fuel supply by the fuel supply means is stopped in a state where the electric shutter device is operated to close the air supply passage.

Further, according to the present invention, the air supply passage, the air supply fan provided in the air supply passage, the vaporization chamber to which the combustion air is supplied by the air supply fan, and the fuel scatterer provided in the vaporization chamber The rotating body, the motor for driving the fuel scattering rotating body and the air supply fan, the fuel supply means for supplying the liquid fuel to the fuel scattering rotating body, and the mixed gas of the fuel vaporized in the vaporization chamber and the combustion air. It is equipped with a combusting part to be combusted and a normally open electric shutter device provided in the air supply passage rather than the air supply fan. The motor is continuously operated for a predetermined time, and the electric shutter device is operated to close the air supply passage to stop the fuel supply by the fuel supply means.

(E) Action With this configuration, the electric shutter device is activated during the fire extinguishing operation to close the air supply passage, so that the supply of combustion air to the vaporization chamber is cut off and the combustion section is in a state of insufficient air supply. become. At this time, since the fuel scattering rotor continues to rotate, the liquid fuel does not remain attached to the fuel scattering rotor, all the liquid fuel is scattered and vaporized, and a red flame is generated in the combustion section. It burns out. Therefore, unlike the conventional case, the liquid fuel attached to the fuel scattering rotor immediately after extinguishing is gradually vaporized, and the unburned gas does not come into contact with the high temperature combustion part to generate a foul odor, Not only is it possible to suppress the generation of foul odors immediately after extinguishing a fire, but since a fan or duct for collecting unburned gas is not required, the device becomes compact and it is applicable to an oil radiation heater without a convection fan.

In the combustion device of the second aspect, the fuel supply is cut off in the state of compulsory weak combustion, and the above-described operation is performed. Therefore, the unburned gas itself is reduced, and the generation of malodor is further suppressed.

(F) Embodiment Hereinafter, an embodiment of the present invention shown in the drawings will be described.

FIG. 7 and FIG. 8 show an example of an oil radiant heater according to the present invention, which has an opening (2) on the front surface (1A),
A combustion device (4) inside an outer case (1) having exhaust ports (3) on the top surface (1B), a red heating element (5) heated by this combustion device (4), and this red heat A glass tube (6) surrounding the body (5), a reflector (7),
An exhaust device (8) for guiding the combustion gas in the glass tube (6) to the exhaust port (3) is provided. Further, a cartridge tank (9) is provided on the rear surface (1C) side of the outer case (1), and the cartridge tank (9) is an oil receiving tank (10) protruding rearward from a lower portion of the outer case (1).
It is removably mounted on top. Further, an operation part (15) having an operation switch (11), combustion amount selection switches (12) (13) (14), etc. is provided at the lower part of the front surface (1A) of the outer case (1), and an opening (2) Is covered by a protective guard (not shown).

As shown in FIG. 1, the combustion device (4) has an air supply passage (18) composed of an air supply duct (16) and a fan case (17). The air intake (16A) of the air supply duct (16) is led to the side surface (1D) of the outer case (1),
An air filter (19) is installed. The electric shutter device (2) is installed at the outlet (16B) of the air supply duct (16).
0) is provided. This electric shutter device (20)
Is a solenoid coil (21), a valve rod (22), a closing plate (23)
And the spring (24), the closing plate (23) is biased by the spring (24) to normally open the outlet (16B) and resist the spring (24) when the solenoid coil (21) is energized. It blocks the exit (16B). Fan cases (17)
The motor (25) and the air supply fan (26) driven by the motor (25) are housed in the. Fan cases (17)
The vaporization chamber (27) communicating with the inside of the fan case (17) above
A vaporization cylinder (28) having the inside is provided. An electric heater (29) for preheating is attached to the vaporization cylinder (28). Further, in the vaporization chamber (27), a fuel scattering rotor (3) which is driven by a motor (25) coaxially with the air supply fan (26).
0) is provided. This rotating body (30) is disc-shaped,
It has blades (31) (32) at the top and bottom. A mixing plate (33) is provided in the vaporization cylinder (28) above the vaporization chamber (27), and a burner head (combustion section) having a large number of flame openings (34) above the mixing plate (33). ) (35) is provided.
(36) is a spark plug provided above the burner head (35), (37) is a frame rod also provided above the burner head (35), and (38) is provided on the fan case (17). A burner case surrounding the vaporization cylinder (28), and the burner case (38) is provided with a large number of secondary air introduction ports (39). Reference numeral (40) is a fuel supply pipe for supplying kerosene to the fuel-scattering rotating body (30), and the fuel supply pipe (40) has a slight gap with the rotating body (30) to form the vaporization chamber (2
It is held by the oil receiving fitting (41) fixed to 7).
The fuel supply pipe (40) is a cartridge tank (9),
A fuel supply unit is configured with the oil receiving tank (10) and the electromagnetic pump (42) attached to the oil receiving tank (10).

FIG. 2 shows a control device for the above-mentioned oil radiation heater. In FIG. 2, the operation switch (11), the combustion amount selection switches (12) (13) (14) and the flame rod (37) are provided on the input side of the microcomputer (43) and the output of the microcomputer (43) is provided. On the side is a spark plug (36), electric heater (32), solenoid coil (2
1), a motor (25) and an electromagnetic pump (42) are provided. Further, (44) is a transistor for driving the solenoid coil (21), (45) is a transistor for driving the electromagnetic pump (42), (46) is a photocoupler for controlling the phase of the motor (25), and (47) is AC power supplies, V _C and V _D are DC power supplies.

The microcomputer (43) described above has a combustion amount selection switch (12) when the operation switch (11) is turned on.
It is determined which of (13) and (14) is turned on, and the operating frequency of the electromagnetic pump (42) and the phase angle of the motor (25) are determined according to the switches (12), (13) and (14). And
First, the electric heater (32) is energized to raise the temperature of the vaporization cylinder (44). When the temperature of the vaporizing cylinder (44) reaches a temperature suitable for vaporizing the fuel, the microcomputer (43) actuates the spark plug (36) and operates the motor (25) and the electromagnetic pump (42). When ignition is confirmed by the signal from the frame rod (37), the operation of the spark plug (36) is stopped. When the temperature of the vaporization cylinder (28) is maintained at a high temperature by combustion, the electric heater (32) is also de-energized.

The air supply fan (26) is rotated by the rotation of the motor (25) during combustion.
Also, the fuel scattering rotor (30) is rotating. Also, the solenoid coil (21) is not energized, and the air supply duct (16)
Since the outlet (16B) is open, the combustion air flows from the air intake (16A) through the air supply duct (16) and the air supply passage (18) inside the fan case (17) to the vaporization chamber (27). ). Further, since the electromagnetic pump (42) is operating, the kerosene in the oil receiving tank (10) passes through the fuel supply pipe (40) and the gap between the fuel scattering rotor (30) and the oil receiving metal fitting (41). Is supplied to. Then, the atomized kerosene is scattered toward the inner peripheral wall of the vaporization cylinder (28), and takes heat from the vaporization cylinder (28) to be vaporized. The vaporized gas is mixed with the combustion chamber air by the blades (31), the mixed gas is further mixed by the mixing plate (33), and then supplied to the burner head (35) and ejected from the flame nozzle (34). Gasification and combustion. Further, the secondary air flowing into the burner case (38) is supplied to the combustion flame from the secondary air inlet (39) .... The combustion gas rises in the glass tube (6) while causing the red heating element (5) to heat red, and enters the exhaust device (8). And the exhaust port (3) ...
... is released indoors. When the combustion amount selection switch (12) is turned on, the motor (25) rotates at high speed, the operating frequency of the electromagnetic pump (42) also increases, and the burner head (35) performs strong combustion. Further, when the combustion amount selection switch (13) is turned on, medium combustion is performed, and when the combustion amount selection switch (14) is turned on, weak combustion is performed.

When the operation switch (11) is opened, the microcomputer (43) instructs the following extinguishing operation according to the amount of combustion, as shown in FIGS. 3 and 4. That is, when the strong combustion or the medium combustion is performed, as shown in FIG. 3, the rotation speed of the motor (25) is lowered and the operating frequency of the electromagnetic pump (42) is lowered. , Lightly burn for 10 seconds. After that, the electromagnetic pump (42) is stopped while the motor (25) is operating at a low speed.
The solenoid coil (21) is energized almost at the same time. At this time, the outlet (16B) of the air supply duct (16) is closed by the closing plate (23), and the supply of air in the vaporization chamber (27) becomes insufficient.
Further, since the fuel scattering rotor (30) continues to rotate, the liquid fuel remaining in the vaporization chamber (27) is vaporized, and the vaporization chamber (27)
After being mixed with the air left in, the burner head (35) becomes a red fire and burns, and the fire extinguishes in about 1 second after the fuel supply is stopped. After that, the solenoid coil (21) is de-energized,
The closing plate (23) is opened and after-purging is performed. The operation time of the shutter device (20) may be as short as 5 to 30 seconds (for example, 10 seconds).

On the other hand, when the weak combustion is performed, as shown in FIG. 4, the fire extinguishing operation is immediately started, the fuel supply is stopped, and the solenoid coil (21) is energized. Then, after the unburned gas in the vaporization chamber (27) is burned out in the state of insufficient air supply, after-purging is performed.

According to the present embodiment, at the time of the fire extinguishing operation, the outlet (16) of the air supply duct (16) is kept while the fuel scattering rotor (30) is rotated.
Since B) is closed by the closing plate (23) to stop the fuel supply, the unburned gas in the vaporization chamber (27) is burned with a red fire,
After extinguishing the fire, it is possible to prevent the unburned gas from remaining and suppress the ignition of a bad odor. In addition, when the combustion is strong combustion or medium combustion, the above-described fire extinguishing operation is performed once after making the combustion weak, so the unburned gas itself at the time of extinction is reduced and the generation of malodor is further suppressed. be able to.

Figure 5 shows the amount of hydrocarbons (T ·
It is the result of examining the time variation characteristics of H.C). In the case of the present example, as shown by the curve a, T, H, C immediately after digestion
Was up to 200 ppm and then gradually decreased. In contrast,
In the case of the conventional type without the shutter device (20) in the air supply passageway (18), in the case of strong combustion extinguishing, TH
C was 500 ppm or more at the maximum, and in the case of weak combustion extinguishing, T, H, and C were 250 ppm or more at the maximum as shown by C. The odor concentrations in the three-point comparative odor bag method are shown in the table below. Here, the odor concentration indicates a dilution factor when odorous air is diluted with odorless air until the odor is no longer felt.

In the above-mentioned embodiment, in the case of strong combustion or medium combustion,
Although the extinguishing operation is performed once after the weak combustion is performed, the extinguishing operation may be performed immediately from the strong combustion or the medium combustion. For example, in the case of strong combustion, the time variation characteristics of the amount of hydrocarbons (T ・ H ・ C) in the atmosphere after extinguishing are as shown in Fig. 6D, compared to B in the case without the shutter device (20). The maximum value of T ・ H ・ C has decreased significantly. In addition, the odor concentration by the three-point comparison odor bag method in this case was 47, compared with 73 in the conventional method.

(G) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

All the liquid fuel adhering to the fuel scattering rotor that caused the odor during digestion was scattered and vaporized, and this unburned gas was made into a state of insufficient supply and burned out with a red fire. Therefore, it is possible to reduce the amount of unburned gas remaining after the digestion, and it is possible to remarkably suppress the generation of a bad odor during the digestion in the fuel device including the fuel scattering rotor.

Unlike the conventional method that uses a fan to collect unburned gas in the tank, it is a method that uses an electric shutter device to burn the unburned gas while keeping the supply shortage. No need for a fan or duct for collecting
It can also be applied to things without a convection fan, such as oil radiant heaters.

There is an effect that the generation of offensive odor can be suppressed by operating the electric shutter device for a short time during fire extinguishing operation, and it is not necessary to wait for a few minutes like when using a fan for recovering unburned gas, and promptly unburned The amount of gas can be reduced and leakage of unburned gas can be prevented.

Further, in the fire extinguishing method of the combustion device according to the second aspect, the combustion just before the extinction can be weakly combusted to reduce the unburned gas itself, and the generation of the bad odor after the extinction can be further suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view of a combustion apparatus showing an embodiment of the present invention,
FIG. 2 is an explanatory diagram of a circuit configuration of a control device of a combustion device, FIG. 3 is a time chart showing a first operation example at the time of fire extinguishing operation of the control device, and FIG. 4 is a time chart showing a second operation example of the same. FIG. 5 is an explanatory view showing an odor characteristic after fire extinguishing by the method of the present invention, FIG. 6 is an explanatory view showing another example of the odor characteristic after extinguishing the fire, and FIG. 7 is petroleum oil to which the present invention is applied. A front view of the radiant heater and FIG. 8 are plan views of the same. (18) …… Air supply passage, (20) …… Electric shutter device,
(25) …… Motor, (26) …… Air supply fan, (27) ……
Vaporization chamber, (30) …… Rotary body for fuel scattering, (35) …… Burner head (combustion section), (40) …… Fuel supply pipe (fuel supply means).

Front Page Continuation (72) Inventor Masafumi Okada 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) References: 63-121253 (JP, U) JP 57-36495 (JP, B2)

Claims (2)

(57) [Claims] 1. An air supply passage, an air supply fan provided in the air supply passage, a vaporization chamber to which combustion air is supplied by the air supply fan, and a fuel scattering rotation provided in the vaporization chamber. Body, a motor for driving the fuel scattering rotor and the air supply fan, fuel supply means for supplying liquid fuel to the fuel scattering rotor, and combustion of a mixed gas of fuel and combustion air vaporized in the vaporization chamber. And a normally-open electric shutter device provided in the air supply passage upstream of the air supply fan.The motor is continuously operated for a predetermined time during fire extinguishing operation, and the electric shutter device is operated. A method of extinguishing a combustion device, characterized in that the fuel supply by the fuel supply means is stopped in a state where the air supply passage is closed. 2. An air supply passage, an air supply fan provided in the air supply passage, a vaporization chamber to which combustion air is supplied by the air supply fan, and a fuel scattering rotation provided in the vaporization chamber. Body, a motor for driving the fuel scattering rotor and the air supply fan, fuel supply means for supplying liquid fuel to the fuel scattering rotor, and combustion of a mixed gas of fuel and combustion air vaporized in the vaporization chamber. A combustor to be operated, and a normally open electric shutter device provided in the air supply passage above the air supply fan are provided, and at the time of a fire extinguishing operation, first, the combustion in the combustor is forcibly made to be weakly combusted, and thereafter, The motor is continuously operated for a predetermined time,
A method of extinguishing a fuel device characterized in that the fuel supply by the fuel supply means is stopped in a state where the electric shutter device is operated to close the air supply passage.