JP3117397B2 - Open hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a countermeasure against odor at the time of extinguishing a fire in an open-type warm air heater for heating by directly discharging combustion heat into a room.

[0002]

2. Description of the Related Art Conventionally, this kind of odor countermeasure has been taken after a fire extinguishing operation as disclosed in, for example, Japanese Patent Application Laid-Open No. 54-879375 and Japanese Utility Model Application Laid-Open No. 59-92357, which was previously filed by the present applicant. The amount of combustion air to the combustion section is reduced by the air volume adjustment means during the fire extinguishing operation to prevent the fuel oil remaining in the combustion section from becoming too much air and becoming unburned gas and blowing out, resulting in odor. During the fire extinguishing process, the excess air in the fire extinguishing process does not cause the flame to blow out, and the fuel oil still remaining in the vaporized part after the fire extinguishing operation is completely burned to prevent the generation of unburned gas, Was to reduce the odor.

[0003]

By the way, in this prior art, the optimum amount of air for combustion is determined from the start of the combustion operation in proportion to the amount of fuel oil remaining in the vaporization section and gradually decreasing after the fire extinguishing operation. Since it could not be supplied in the entire process until the fire was completely extinguished, even when the flame was extinguished, a lot of vaporized fuel oil that had not yet been burned remained and was blown out as unburned gas, which caused odor to be generated inside the room. There was the disadvantage of spreading.

[0004]

The present invention pays attention to this point, and in order to solve the above-mentioned drawbacks, in particular, the configuration of the present invention relates to fuel supplied from an electromagnetic pump via a fuel supply pipe and driving of a combustion fan. The combustion air supplied by the combustion unit is burned in a combustion unit, and the combustion heat is forcibly released into the room by driving a convection fan to extinguish the fire in a warm air heater for heating.
Immediately after operation, stop supplying power to the combustion fan and rotate
And after a certain time after the fire extinguishing operation
Immediately after the power supply to the
The fuel return control for returning the remaining fuel oil is performed .

[0005]

When the operation switch 52 is turned off, an OFF signal is output from the operation switch 52 to the microcomputer 51, and the control means 50 in the microcomputer enters a fire extinguishing operation. When the OFF signal is input from the operation switch 52 to the microcomputer 51, the timer means 56 in the microcomputer 51 starts counting, and stops supplying power to the combustion fan 4 to cause the combustion fan 4 to inertia. Rotate. As a result, the amount of fuel gas to be vaporized does not change and the amount of combustion air gradually decreases until a certain time elapses after the OFF signal is input to the microcomputer 51. Continue.

[0006] A signal output from the timer means 56 after a predetermined time has elapsed since the OFF signal was input to the microcomputer 51 and the timer means 56 started counting,
The control means 50 stops energizing the electromagnetic pump 2. As a result, the amount of fuel oil vaporized after the electromagnetic pump 2 is stopped gradually decreases, but the number of revolutions of the combustion fan 4 rotating due to inertia also decreases, and the amount of combustion air decreases considerably. Even after the electromagnetic pump 2 stops, the combustion with a shortage of combustion air continues.

When the fuel oil evaporates in the combustion section 1 and almost no unburned gas remains, the air becomes excessive and the flame blows out, extinguishing the fire. Immediately after the OFF signal is input to the microcomputer 51 and the power supply to the electromagnetic pump 2 is stopped after a lapse of a predetermined time from the start of counting by the timer means 56, the control means 50 in the microcomputer 51 starts pump driving. The frequency of the pulse wave supplied to the electromagnetic pump 2 via the circuit 55 is controlled by the vertical movement of the plunger 22 in the electromagnetic pump 2.
In addition to increasing the frequency to stop at a certain position without being able to follow the repetition rate of the excitation / de-excitation of the electromagnetic coil 42 in the inside, the pulse width of the pulse wave is gradually increased, and then supplied. Fuel oil return control for stopping the supply of the pulse wave is performed.

As a result, the plunger 22 slowly moves from the top dead center, which is the uppermost end during normal driving, to the upper limit point further upward, and the push-up member 33 projecting from the plunger 22 is moved.
Opens the discharge check valve 36 and discharges a part of the fuel oil remaining in the fuel supply pipe 3 into the cylinder 17 in the electromagnetic pump 2.
To prevent the fuel oil from dripping into the combustion part 1 at the time of fire extinguishing, and reduce the amount of fuel oil vaporized in the combustion part 1 after the electromagnetic pump 2 is stopped. As a result, the unburned gas which has not yet been burned due to the vaporization of the fuel oil in the combustion section 1 hardly remains, and the air becomes excessive and the flame blows out. The amount of gas is even lower.

[0009] The operation switch 52 is connected to the microcomputer 51.
An OFF signal is output to the convection fan 12 one second after the control means 50 in the microcomputer 51 starts the fire extinguishing operation.
Also, the convection fan 12 is rotated by inertia by stopping the supply of electric power to the combustion tube 7 so that the combustion tube 7 is cooled by blowing air even after the fire extinguishing operation is started, and remains in the combustion unit 1 after the fire extinguishing operation is started. This prevents overheating of the combustion cylinder 7 due to combustion of fuel oil.

Conversely, an OFF signal is output from the operation switch 52 to the microcomputer 51, and a half-wave is supplied to the convection fan 12 for a predetermined time one second after the control means 50 in the microcomputer 51 starts the fire extinguishing operation. Brake control is performed to stop the post-energization, and the convection fan 12 is suddenly braked to stop the rotation instantaneously, so that the convection fan 12 rotates from the start of the fire extinguishing operation and blows out from the outlet 13 of the main body. To further prevent odor diffusion.

Also, six seconds after the OFF signal is input to the microcomputer 51, the convection fan 12 is energized and driven again to cool the combustion section 1, and is completely stopped 84 seconds after the drive is restarted. is there. Also, the combustion fan 4 is energized again and driven to cool the combustion section 1 10 seconds after the OFF signal is input to the microcomputer 51, and is completely stopped together with the convection fan 12 80 seconds after the restart of driving. Things.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an open-type warm air heater according to the present invention. An electromagnetic pump 2 is heated by a heating means (not shown) and has a fuel return function.
A fuel unit that vaporizes fuel oil supplied from a fuel supply pipe 3 through a fuel supply pipe 3, pre-mixes the vaporized gas with combustion air supplied by a combustion fan 4, and then vaporizes and burns.
The upper part is provided on the partition plate 6 in the main body frame 5 so as to protrude.

Reference numeral 7 denotes an upwardly open combustion cylinder which covers the outer periphery of the combustion section 1 on the partition plate 6, and is provided at its upper end with a rectifying plate 9 having a plurality of openings 8.

Reference numeral 10 denotes a heat shield plate for shielding the upper part of the combustion cylinder 7, and a guide plate 11 is provided between the combustion cylinder 7 and the main body frame 5.
A blast from a convection fan 12 provided on the back side, a hot air passage 14 for discharging combustion heat generated in the combustion unit 1 as warm air from a front outlet 13, and a blast for blowing out blast at a temperature lower than the warm air. A path 15 is formed. A guard 16 covers the convection fan 12.

Next, the above-described electromagnetic pump 2 with a fuel return function will be described in detail with reference to the cross-sectional view of FIG. Reference numeral 17 denotes a cylinder, which has a cylindrical shape, and has a flow path 18 in the center at the upper end.
Is fixedly provided, and the cylinder 1
7, a plunger 2 comprising an upper plunger 20 and a lower plunger 21 which reciprocates up and down in a cylinder 17.
2 are provided.

The lower plunger 21 constituting the plunger 22 is located substantially below the inside of the cylinder 17 and has a cylindrical shape whose outer diameter is slightly smaller than the inner diameter of the cylinder 17 and smoothly reciprocates in the cylinder 17. It works. A flow passage 23 is formed in the inside from the upper end to the substantially center, and a suction check valve housing 24 having a larger inner diameter than the flow passage 23 is formed from the substantially center to the lower end. At the lower end of the storage portion 24, a suction check valve seat 26 having a flow path 25 formed at the center is fixedly mounted. The suction check valve seat 26 is provided on the upper surface side of the suction check valve seat 26. A valve 27 is provided.

Further, in the upper space of the suction check valve 27,
A suction check valve spring 28 composed of a coil spring is provided,
The suction check valve 27 is urged downward to the suction check valve seat 26 side. A lower spring 29 composed of a coil spring is disposed in a space in the cylinder 17 between the lower end of the lower plunger 21 and the lower end of the cylinder 17, and urges the lower plunger 21 upward.

The upper plunger 20 constituting the plunger 22 is located substantially at the center of the cylinder 17 and forms a pump chamber 30 between the plunger 22 and a valve seat 19 fixed to the upper end of the cylinder 17. It is a columnar body in which a predetermined number of flow passages 31 having a smaller cross-sectional area than the flow passage 23 of the lower plunger 21 are formed in a circumferential direction in the axial direction. Further, the pump chamber 30
An upper spring 32 made of a coil spring is disposed in the inside to urge the upper plunger 20 downward.

Further, the upper plunger 20 is provided with a skewer-shaped solid push-up member 33 projecting upward so as to be able to pass through the flow path 18 of the valve seat 19, and the cross-sectional area of the push-up member 33 is The size is such that the fluid can sufficiently pass even in a state where the fluid penetrates the flow path 18.

Reference numeral 34 denotes a discharge joint which is connected above the cylinder 17 and has a center penetrating from the upper end to the lower end, and the lower part of the penetrating portion is fixed to the upper end of the cylinder 17 and the upper end of the cylinder 17. A seat 35 for accommodating the valve seat 19 is formed.
5, the discharge check valve 36 disposed at the upper end of the valve seat 19 and the discharge check valve 36 disposed thereabove.
A discharge check valve housing 38 is formed in which a discharge check valve spring 37 for urging the valve seat 19 is housed.

Above it, a discharge port 39 formed at the center of the upper end of the discharge joint 34 and a discharge check valve housing 38
And a small-diameter pore portion 40 that communicates with.
The suction check valve spring 28 and the discharge check valve spring 37 are used.
Are weaker springs than the lower spring 29 and the upper spring 32, and the suction check valve 27 and the discharge check valve 36 are respectively positioned below the suction check valve seat 26 and the valve seat 19 side. This causes the suction check valve 27 and the discharge check valve 36 to function as check valves.

A bobbin 41 is wound around an electromagnetic coil 42 and is provided substantially at the center of the cylinder 17 in the axial direction. Two bobbins are provided radially from an appropriate position of an upper flange portion of the bobbin 41. A base having a terminal 43 is extended, and lead wires at both ends of the electromagnetic coil 42 are connected to the terminal 43. A short dimension upper annular magnetic path 44 and a long dimension lower annular magnetic path 45 are provided between the bobbin 41 and the cylinder 17 with a predetermined gap 46 interposed therebetween. 22 is set on the upper side as compared with the equilibrium position.

Reference numeral 47 denotes a yoke which has a U-shaped cross section and bobbin 4 so that the upper annular magnetic path 44 and the lower annular magnetic path 45 are connected.
1 to form a magnetic circuit, which is fixed to the cylinder 17 and is attached at its lower end to a mounting hole formed in the upper surface of the oil receiving tray 4, whereby the electromagnetic circuit is formed. The pump 8 is erected and fixed to the oil pan 4. Reference numeral 48 denotes a suction pipe which is connected to the lower end of the cylinder 17 and has a suction port 49 provided with a filter for removing impurities and the like at its tip.
Are formed.

Next, the electric circuit will be described. Numeral 50 denotes control means comprising a program circuit having functions such as storage, calculation and comparison provided in the microcomputer 51. The input means is provided with an operation switch 52 for controlling the operation of the heater by ON / OFF on the input side. The output side is connected to the gate sides of a first braking means 53 and a second braking means 54 which are bidirectional thyristors for controlling the ON / OFF and driving of the combustion fan 4 and the convection fan 12 in waveform.

The electromagnetic pump 2 is connected to the output side of the control means 50 via a pump drive circuit 55.

Reference numeral 56 denotes a microcomputer 51 similar to the control means 50.
The timer means provided therein includes a timer means for receiving an output signal from the control means 50, starts timing, and outputs a time-up signal to the control means 50 at the arrival of each preset time.
0 controls the first and second braking means 53 and 54 and the pump drive circuit 55.

Reference numeral 57 denotes a main drive circuit which uses an AC power supply 58 as a power supply, and includes a series circuit of the combustion fan 4 and the driving side of the first braking means 53 and a series circuit of the convection fan 12 and the driving side of the second braking means 54. A circuit and a combustion control circuit 59 for controlling other driving parts such as a heating means are connected to each other.

Next, the pump drive circuit 55 shown in FIG. 4 will be described. A constant voltage circuit 60 is connected to a DC power supply terminal and supplies a constant 24 V DC to the electromagnetic pump 2.
It is composed of a C chip.

Reference numeral 61 denotes a switching element comprising a transistor connected to the output terminal of the control means 50.
A pulse signal applied to the electromagnetic pump 2 by being turned ON / OFF by a control signal from 0 is controlled, and combustion control is performed by increasing or decreasing the supply amount of fuel, and at the time of fire extinguishing, fuel return control for returning fuel in the fuel supply pipe 3 is performed. It is what is done.

Next, the operation of the embodiment of the present invention will be described with reference to FIG.
The description will be given according to the Kens diagram. Now, if a fire extinguishing operation is performed in which the operation switch 52 is turned off from the normal operation state, an OFF signal is input to the microcomputer 51 by the operation switch 52, whereby the timer means 56 in the microcomputer 51 starts counting, and The power supply to the combustion fan 4 is stopped, and the combustion fan 4 is rotated by inertia.

Then, the count start 1 of the timer means 56 is started.
The convection fan 12
The power supply to the electromagnetic pump 2 is stopped by outputting a time-up signal after 2.5 seconds from the start of counting.

The reason why the electromagnetic pump 2 is energized and driven for a certain period of time after the OFF signal is input to the microcomputer 51 as described above is that the combustion fan 4 is rotated by inertia after the OFF signal is input, and gradually increases. In order to continue sending the combustion air although the amount decreases, immediately after the OFF signal is input to the microcomputer 51, if the power supply to the electromagnetic pump 2 is stopped, the oil supply is stopped instantaneously, and the combustion suddenly becomes excessive air. Immediately after that, the flame is blown out and a large amount of unburned gas of fuel oil is generated.

That is, while the amount of combustion air gradually decreases for a certain time after the OFF signal is input to the microcomputer 51, the amount of fuel does not change. And the flame does not blow out.

The reason why the convection fan 12 is energized and driven for a predetermined period of time after the OFF signal is input to the microcomputer 51 is that the electromagnetic pump 2 is driven for a certain period of time after the OFF signal is input to the microcomputer 51. Since the amount of combustion hardly changes, the combustion cylinder 7 is cooled so as not to overheat.

When the power supply to the electromagnetic pump 2 is stopped 2.5 seconds after the timer means 56 starts counting,
The supply of fuel oil into the combustion unit 1 stops, and the amount of fuel oil vaporized in the combustion unit 1 decreases with time.

On the other hand, when the OFF signal is input to the microcomputer 51, the amount of combustion air is already stopped and the combustion fan 4 is rotating by inertia.
The amount of combustion air becomes short after the OFF signal is input to the microcomputer 51, and the amount of fuel vaporized after the electromagnetic pump 2 is stopped has already decreased in rotation speed, so the amount of combustion air is always insufficient. It becomes slightly, and combustion continues in that state.

At this time, the convection fan 12 rotates due to inertia and gradually decreases its rotation speed to reduce the amount of air to be blown. Is to cool.

When the fuel oil vaporized in the combustion part 1 burns after the electromagnetic pump 2 is stopped, and the amount of fuel oil to be vaporized becomes very small, the amount of combustion air becomes larger than the amount of fuel oil vaporized and the flame blows. The fire goes out and the fire is extinguished. at the time,
The fuel oil vaporized after the electromagnetic pump 2 is stopped is almost completely burned, and unburned gas of the fuel oil is not diffused from the outlet 13 of the main body, thereby suppressing generation of odor.

At that time, the rotation of the convection fan 12 due to inertia has already stopped, so that there is no blowout from the blowout port 13 of the main body after the fire is extinguished, thereby further suppressing generation of odor.

When the timer means 56 counts 6 seconds after the OFF signal is input to the microcomputer 51 and outputs a time-up signal, the convection fan 12 is driven again,
The energization is stopped 84 seconds after re-driving. Also, the combustion fan 4 is re-driven when the timer means 56 counts 10 seconds after the OFF signal is input to the microcomputer 51 and outputs a time-up signal, and stops energization 80 seconds after the re-drive. As a result, the still high-temperature combustion section 1 can be reliably and rapidly cooled to prepare for re-combustion.

Further, the power supply to the electromagnetic pump 2 is stopped 2.5 seconds after the OFF signal is input to the microcomputer 51. Immediately after the stop, the control means 50 controls the electromagnetic pump 2 to return the fuel oil. Thus, the amount of unburned gas of fuel oil remaining at the time of fire extinguishing can be further reduced, and the generation of odor can be further suppressed.

That is, when the timer means 56 outputs a time-up signal after counting 2.5 seconds from the input of the OFF signal to the microcomputer 51, the pump drive circuit 55 receives the control signal of the control means 50 and outputs a 24V signal. About 4Hz ~
The supply of the pulse wave during normal driving, which changes between 25 Hz, to the electromagnetic pump 2 is stopped, and a high-frequency pulse wave of 300 Hz or more and the on-time is increased by 4 μsec.
Supply to the electromagnetic pump 2 for only 5 seconds.

That is, the electromagnetic pump 2 stops at a position where the vertical movement of the plunger 22 in the electromagnetic pump 2 cannot follow the repetition rate of the excitation and non-excitation of the electromagnetic coil 42 in the electromagnetic pump 2. Is supplied, and the pulse width of the pulse wave is gradually increased, so that the plunger 22 in the electromagnetic pump 2 is at the uppermost end during normal driving. The plunger 22 moves slowly from a certain top dead center to a further upper limit point.
The push-up member 33 protruding from the fuel supply valve opens the discharge check valve 36, and returns a part of the fuel oil remaining in the fuel supply pipe 3 to the cylinder 17 in the electromagnetic pump 2, so that the fuel oil at the time of fire extinguishing Is prevented from dropping to the combustion section 1 to reduce the amount of fuel oil vaporized in the combustion section 1 after the electromagnetic pump 2 is stopped.

When the fuel return control is performed on the electromagnetic pump 2, the total amount of fuel vaporized after the electromagnetic pump 2 is stopped becomes:
Since there is less air than when the fuel return control is not performed, the air becomes excessive more quickly than when the fuel return control is not performed, and as a result, the flame goes out earlier. Since the total amount of fuel vaporized after the pump 2 is stopped is small, the unburned fuel gas remaining after the flame is extinguished is
This is less than the case where the fuel return control is not performed, and the generation of odor can be further suppressed.

Further, the unburned fuel gas generated after performing the fire extinguishing operation of turning off the operation switch 52 from this normal operation state will be described in detail. First, as shown in FIG. Immediately after the fire extinguishing operation is performed, the power supply to the electromagnetic pump 2 is stopped at the same time, and the combustion fan 4 is supplied with power as it is to continuously drive it. When the ratio of vaporized fuel oil to air becomes a1: b1, that is, A At this point, there is too much air and there is a misfire, and the amount of unburned gas in the fuel oil after misfire becomes 〓.

Here, immediately after the fire extinguishing operation in which the operation switch 52 is turned off, the power supply to the combustion fan 4 is stopped and the combustion fan 4 is rotated by inertia. Since the amount of combustion air is smaller than in the case of continuous driving, the excess air causes misfiring later than in the case of continuously driving the combustion fan 4, and when the ratio of vaporized fuel oil to air becomes a2: b2, That is, at the point B, the air becomes excessive and the fire is lost, and the amount of the unburned gas of the fuel oil after the misfire becomes {smaller} when the combustion fan 4 is continuously driven.

Further, for a certain period of time after performing the fire extinguishing operation in which the operation switch 52 is turned off, the operation of the operation switch 52 is turned off by driving the electromagnetic pump 2 for a certain period of time while driving the electromagnetic pump 2 as it is. Than when the power supply to the electromagnetic pump 2 is stopped immediately after performing the fire extinguishing operation.
The amount of fuel oil vaporized becomes larger than the amount of combustion air by the combustion fan 4 rotating by inertia.

Therefore, the occurrence of misfiring due to excessive air combustion is later than the case where the power supply to the electromagnetic pump 2 is stopped immediately after the operation switch 52 is turned off, and the ratio of vaporized fuel oil to air is a3: When it becomes b3, that is, C
At this point, the amount of unburned gas in the fuel oil after the misfire is determined by stopping the electromagnetic pump 2 immediately after performing the fire extinguishing operation by turning off the operation switch 52 and simultaneously causing the combustion fan 4 to inertia. It becomes {less than} when rotated at.

Further, when fuel return control is performed on the electromagnetic pump 2 immediately after driving the electromagnetic pump 2 for a certain period of time as shown in FIG. 7, the amount of fuel vaporized after the electromagnetic pump 2 stops is reduced. When the ratio of the vaporized fuel oil to the air becomes a4: b4, that is, when the ratio of the vaporized fuel oil to the air becomes a4: b4, that is, at the point D which is earlier than the point C when the fuel return control is not performed, the air becomes excessive. Misfire occurs due to excess.

However, since the amount of fuel vaporized after stopping the electromagnetic pump 2 is much smaller than the case where the fuel return control is not performed, the amount of unburned fuel gas after misfire is determined by turning off the operation switch 52. Immediately after the operation, the combustion fan 4 is rotated by inertia, and the electromagnetic pump 2 is driven for an extended period of time, which is {less than}, so that generation and diffusion of odor can be further prevented.

Further, as another embodiment, the blowout from the main body outlet 13 is eliminated earlier than the cooling of the combustion part 1 and the combustion cylinder 7 by the combustion after the fire extinguishing operation in which the operation switch 52 is turned off. In order to further prevent the odor from spreading, as shown in FIG.
The F signal is input to the microcomputer 51, so that the timer means 56 in the microcomputer 51 starts counting and stops the rotation of the convection fan 12 one second after one second. After supplying a half-wave of a commercial power supply frequency of 50 or 60 Hz for 2 seconds, energization is stopped, and rapid braking is applied to stop rotation.

As a result, although the cooling of the combustion section 1 and the combustion cylinder 7 is delayed, the blowout from the main body outlet 13 after the fire extinguishing operation in which the operation switch 52 is turned off is quickly stopped, and the diffusion of the odor is reduced. It can be more reliably prevented.

FIG. 8 shows that the heating capacity is 2500 Kcal /
h, the maximum value of HC (hydrocarbon), which is the main component of the odor, after the operation was stopped was measured. FIG. 9 shows the same oil fan heater as 0.7 mx
Placed in a simple case with dimensions of 0.9 mx 0.7 m and an internal volume of 0.44 m ³ , the main component of odor HC
The change in the total amount was measured.

In the figure, X indicates that after the operation switch 54 was turned off, the combustion fan 4 was continuously driven as it was, the electromagnetic pump 2 was stopped after 1 second, and the convection fan 12 was stopped for 6 seconds and then driven again for 84 seconds. It is conventional. Y in the figure is
After the operation switch 54 is turned off, the combustion fan 4 is turned off for 10 seconds, and then driven again by inertia for 10 seconds and then re-driven for 80 seconds. The electromagnetic pump 2 is extended for 2.5 seconds and stopped after performing fuel return control. Then, the convection fan 12 supplies the half-wave of the commercial power supply frequency for one second and stops the rotation after one second, and is driven again for 84 seconds three seconds after the supply of the half-wave is completed. is there.

As a result of the measurement, first, as shown in FIG. 8, the maximum value of HC is 2.6 ppm after 6 minutes from the stop of operation, while the maximum value of HC is 0.53 p when 6 minutes and 30 seconds after stop of operation.
pm and X are very low, about 1/5 of X, and the generation of odor is suppressed. As shown in FIG. 9, the total amount of HC is 6.32 ppm for X and Y is 2.94 pp at 1 minute after the operation is stopped.
m, X is 8.82 ppm after 2 minutes from operation stop, Y is 3.82 ppm, Y is 3.72 minutes after operation stop, X is 11.18 ppm, Y is 4.71 ppm, and 5 minutes after operation stop At the time of passage, X was 13.97 ppm,
Y is 5.02 ppm, which is very small, about 1/3 of X after 5 minutes from the stop of the operation, and prevents generation and diffusion of odor even in the total amount.

In addition, the control means 50 controls the first and second braking means 53 and 54 so that both the combustion fan 4 and the convection fan 12 have a pre-programmed rotational speed according to the deviation between the set temperature and the room temperature. Therefore, when the fire is extinguished, the rotation speeds of the fans 4 and 12 are the rotation speeds that were being driven when the operation switch 52 was turned off, and are not constant. The rotation speed of both the fan 4 and the convection fan 12 is low, and conversely, when the combustion amount is large, the rotation speed of both the combustion fan 4 and the convection fan 12 is high.
The combustion after performing the fire extinguishing operation by turning off the operation switch 52 does not cause an excessive air shortage or an excessive air shortage.

[0057]

In short, the present invention is directed to a fuel oil supplied from an electromagnetic pump 2 through a fuel supply pipe 3 and a combustion fan 4
The combustion air supplied by the drive is burned in the combustion section 1, and the combustion heat is forcibly released into the room by the drive of the convection fan 12. is rotated by inertia and stops energizing the fan 4, after extinguishing operation, the electromagnetic port after a predetermined time has elapsed
Immediately after the power supply to the pump 2 is stopped,
Performing fuel return control for returning fuel remaining in the supply pipe 3
As a result, part of the fuel oil remaining in the fuel supply pipe 3 is
Pump 2 returns to the hot combustion section 1
Amount of fuel oil to be prevented and vaporized in the combustion part 1 after the fire extinguishing operation
Unburned gas of fuel oil that has been vaporized when the flame extinguished
That can greatly reduce the remaining amount of odor and prevent the generation of odor
It is.

[0058]

Further, the convection fan 12 is operated by the fire extinguishing operation.
By stopping the power supply to the cylinder and rotating it by inertia, it is possible to cool the combustion cylinder 7 by blowing air until the rotation stops, thereby preventing overheating of the combustion cylinder 7 due to combustion after the fire extinguishing operation.

Immediately after the fire extinguishing operation, after a lapse of a predetermined time, the convection fan 12 is subjected to braking control to perform rapid braking, so that the fire extinguishing operation for turning off the operation switch 52 is performed from the main body outlet 13. It is possible to prevent the diffusion of odor by quickly eliminating the blowing.

[Brief description of the drawings]

FIG. 1 is a sectional view of an open-type hot-air heater provided with an embodiment of the present invention.

FIG. 2 is a sectional view of the electromagnetic pump.

FIG. 3 is an electric circuit diagram of the main part.

FIG. 4 is a detailed view of the pump drive circuit.

FIG. 5 is a sequence diagram of the main part at the time of fire extinguishing.

FIG. 6 is an explanatory diagram of unburned gas at the time of fire extinguishing.

FIG. 7 is an explanatory diagram of unburned gas when the electromagnetic pump is controlled to return fuel oil.

FIG. 8 is a graph of the measurement result of the highest value of the odor component.

FIG. 9 is a graph showing the measurement results of the total amount of the odorous components.

FIG. 10 is a sequence diagram at the time of extinguishing a fire in an open-type hot-air heater to which another embodiment of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion part 2 Electromagnetic pump 3 Fuel supply pipe 4 Combustion fan 12 Convection fan 50 Control means

Continuing from the front page (72) Inventor Masahiro Tamura 7-7 Higashi Shinbo, Sanjo City, Niigata Pref. (72) Inventor Takeshi Kondo 7-7 Higashi Shinbo, Sanjo City, Niigata Pref. References JP-A-4-39518 (JP, A) JP-A-6-347034 (JP, A) JP-A-4-340006 (JP, A) JP-A-9-145050 (JP, A) JP 54-87937 (JP, A) Japanese Utility Model Showa 61-175740 (JP, U) Japanese Utility Model Application Hei 6-84150 (JP, U) Japanese Utility Model Showa 59-92357 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F24H 3/04 305 F23N 5/20 101

Claims (3)

(57) [Claims] 1. A combustion unit 1 burns fuel oil supplied from an electromagnetic pump 2 via a fuel supply pipe 3 and combustion air supplied by driving a combustion fan 4, and dissipates this combustion heat to a convection fan 12. Immediately after the fire extinguishing operation, the power supply to the combustion fan 4 is stopped in the hot air heater that forcibly discharges the air into the room by heating and performs heating, and the combustion fan 4 is rotated by inertia and extinguished.
After operation, stop supplying power to the electromagnetic pump 2 after a certain period of time
Immediately after burning, the fuel remaining in the fuel supply pipe 3 is supplied to the electromagnetic pump 2.
An open-type hot-air heater characterized by performing fuel return control for returning oil . 2. The convection fan 12 is subjected to the fire extinguishing operation.
The energization is stopped and the shaft is rotated by inertia.
The open-type warm air heater according to claim 1. 3. After a lapse of a predetermined time from the fire extinguishing operation,
Braking the flow fan 12 by performing brake control
The open-type warm air heater according to claim 1, characterized in that: