JP2876945B2 - Pot-type oil combustor controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for stably extinguishing a pot-type oil combustor.

[0002]

2. Description of the Related Art A pot-type oil combustor supplies combustion air from a small hole into a pot having a large number of holes formed in a side wall thereof.
On the other hand, the fuel pipe is looked into the pot, and a fuel pump attached to the fuel pipe is operated to supply fuel to the pot. The fuel is vaporized, mixed, and burned in the pot, and the fuel is discharged. The part reaches the combustion chamber above the pot. Therefore, unlike a Bunsen burner or a vaporization type burner, the pot type oil combustor also burns in the pot, which is the vaporization section, so even impure fuels containing high molecular weight fuel that is difficult to vaporize cannot be burned. The combustion can be maintained for a considerable time until it becomes.

[0003] However, when constant combustion is continued with such an impure fuel for a long time, impurities such as tar accumulate in the pot, and eventually, the combustion cannot be continued and ignition fails at the time of ignition operation. The tar or the like deposited in the pot in this way burns little by little by continuing the combustion with the normal fuel and the changed fuel flow rate (calorific value), and it is possible to return to a clean state. Therefore, no countermeasures have been taken against tar accumulation in the pot type oil combustor so far.The fire pump is stopped when the fire extinguishing operation is performed, the blower is post-purged, and the blower is stopped when the burner cools down after the fire is extinguished. It is common to completely extinguish the fire.

[0004]

For this reason, the conventional pot type oil combustor is based on the premise that a fuel having a stable property such as kerosene is used, and as long as such a fuel is used, it is particularly required. Although there is no problem, when only poor quality fuel can be obtained or when a large amount of kerosene is converted to defective kerosene and it is necessary to use up this fuel, a large amount of tar is deposited in the pot and used. It may be impossible, and once it is in such a state, repairing is a very difficult task, and you will have to request a professional company to repair,
There is a demand for some quick response.

[0005]

The present invention focuses on the relationship between the accumulation of tar in a pot and the fire extinguishing time, and mounts a pot 1 having a large number of small holes 1a in a side wall in a wind tunnel 2. A blower 3 for supplying combustion air into the wind tunnel 2;
In addition, in a combustor in which the oil tank 4 and the pot 1 are connected by a fuel pipe 5 and a fuel pump 6 is attached in the middle of the fuel pipe 5, flame detection is performed using a frame electrode 7 whose tip extends into the pot 1 as an input. A first timer 9 for attaching the device 8 and starting counting at the time of the fire extinguishing operation is provided, the operation of the fuel pump 6 is stopped by the fire extinguishing operation, and the first timer 9 counts the flame detection time by the flame detecting device 8, When the flame detection has continued for a predetermined time, the error circuit 10 is activated. When the flame detection is stopped, the second timer 11 is activated.
The timer 11 causes the blower 3 to perform a post-purge operation until it counts up.

The blower 3 maintains the rotation speed immediately before the fire extinguishing operation while the flame detector 8 detects the flame. When the flame detection is stopped, the blower 3 is set to the rotation speed for post-purge. It stabilizes combustion up to.

Further, the output of the second timer 11 is
When the second timer 11 counts up, the blower 3 stops operating, and the save determination circuit 12 determines save mode operation and the operation of the error circuit 10. When the operation is stopped, the save mode operation is not performed, and the error is not displayed, the operation of the combustor is stopped to perform the save standby operation, and the operation can be automatically restarted when the room temperature decreases.

[0008]

When the fuel pump 6 is stopped by the fire extinguishing operation by the manual fire extinguishing switch operation and the fire extinguishing operation (save operation) automatically performed when the room temperature becomes higher than the set temperature, the supply of the fuel into the pot 1 is stopped. The fuel remaining in the pot 1 continues to burn, and eventually burns and completely extinguishes the fire. At this time, if combustion residues such as tar are accumulated in the pot 1, the fuel supplied to the pot 1 is impregnated into the tar, and it takes a considerable time before the fire is extinguished due to the state of burning without air. .

According to the present invention, a first timer 9 is provided for the flame detecting device 8, and when the flame detecting device 8 which operates even after the fire extinguishing operation continues to detect the flame for the time set by the first timer 9,
It is determined that tar has accumulated in the pot 1, and the error circuit 10 is operated to display an abnormality using a buzzer or a lamp.

On the other hand, since the rotation speed of the blower 3 during the flame detection maintains the rotation speed immediately before the fire extinguishing operation, the combustion state after the fire extinguishing operation can be maintained in the same combustion state as in the normal combustion. After the combustion flame is no longer detected, the number of revolutions of the blower 3 is set for post-purge, and this number of revolutions is not for supplying air for combustion but for obtaining an appropriate amount of air after extinguishing. The number of rotations may be used, and the operation time is controlled by the second timer 11.

Further, the count-up output of the second timer 11 stops the operation of the blower 3 and activates the save determination circuit 12. If the error circuit 10 is activated during the save operation, the save operation is performed. Stop,
The operation of the oil combustor is stopped and the fire is extinguished.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 denotes a pot having a number of small holes 1a formed in a side wall;
Reference numeral 3 denotes a blower for supplying combustion air to the pot 1, and 2 denotes a wind tunnel into which the air sent by the blower 3 is blown.
Is attached inside the wind tunnel 2, and the combustion air passing through the wind tunnel 2 is supplied into the pot 1 from the small holes 1 a.

Reference numeral 4 designates an oil tank comprising a constant oil level unit to which fuel is sent from an outdoor tank (not shown) via a metal pipe. In another embodiment, a combustor which is replenished when necessary by a handler using a plastic can or the like. It may be an oil tank mounted in the frame body, or an oil pan in which a cartridge oil tank for movement is mounted. Reference numeral 5 denotes a fuel pipe connecting the oil tank 4 and the pot 1, and reference numeral 6 denotes a fuel pump mounted in the middle of the fuel pipe 5.
To supply an appropriate fuel flow rate to the pot 1.

Reference numeral 7 denotes a frame electrode having a tip extending into the pot 1 and attached. Reference numeral 8 denotes a flame detection device which receives the frame electrode 7 as an input. Fuel and air are sent into the pot 1 and an ignition device (not shown) When the combustion starts, the combustion flame touches the frame electrode 7 and the flame detection device 8 outputs a combustion start signal.

13 is a combustion chamber located above the pot 1, 14 is a heat exchanger connected to the combustion chamber 13, 15 is an exhaust fan that rotates coaxially with the blower 3, and 16 is a heat exchanger 14 and a combustion chamber. The combustion gas generated in the pot 1 and the combustion chamber 13 exchanges heat with the indoor air in the combustion chamber 13 and the heat exchanger 14, and is exhausted outside by the exhaust fan 15. At this time, the convection fan 16
Are connected in parallel with the blower fan 3 for supplying combustion air, and the operation of the convection fan 16 is stopped in conjunction with the blower 3. The start of operation is delayed from the start of operation of the blower 3 by a timer or the like, so that the convection fan 16 does not blow cool air at the beginning of ignition.

In the general pot-type oil stove having the above-mentioned configuration, the present invention is to improve the fire extinguishing system and detect the accumulation of tar, and 17 is a fire extinguishing switch for generating a signal for starting a fire extinguishing operation. This function may be constituted by a signal of an operation switch operated by an operator or a signal of a save operation for automatically extinguishing a fire when the room temperature rises above a set temperature. Reference numeral 9 denotes a first timer activated by a signal from the fire extinguishing switch 17, reference numeral 10 denotes an error circuit that operates during a set time of the first timer, and reference numeral 10a denotes a display formed by a lamp or a buzzer of the error circuit 10.

When a fire extinguishing operation is performed by the fire extinguishing switch 17, the fuel pump 6 is stopped and the first timer 9 is set to start counting. The first timer 9 counts while checking the output signal of the flame detection device 8, and if the output signal of the flame detection device 8 disappears before the set time, the rotation number of the blower 3 is set to the post-purge operation. On the other hand, if the set time of the first timer 9 comes with the output signal indicating that there is a flame, the error circuit 10 is activated, the cause of the extension of the fire extinguishing time is determined to be the accumulation of tar, and an abnormal state is indicated by the display 10a. Inform

Reference numeral 11 denotes a second timer which is started after the number of rotations of the blower 3 is set to a post-purge operation by a signal of the first timer 9, and the second timer 11 is activated after the flame detecting device 8 detects no flame. During the set time of the timer 11, the blower 3 performs the post-purge operation, and when the second timer 11 counts up, the operation of the blower 3 is stopped. The blower 3 is connected in parallel with the convection fan 16, and the convection fan 16 performs the post-purge operation at the same timing as the blower 3 and extinguishes the fire.

A save judging circuit 12 operates after the second timer 11 counts up.
Determines whether the error circuit 10 has been activated during the save operation. If the error circuit 10 has been activated during the save operation, it has a function of canceling the save operation, and the error circuit 10 does not operate. When the fire is extinguished normally, the save operation starts, and when the room temperature decreases, the oil combustor starts operating again.

[0020]

[Effect] The present invention shows that when the time from the fire extinguishing operation to the fire extinguishing is long, there is an abnormality in the fuel system,
Most of the causes other than the failure of the parts are determined to be when the tar has accumulated in the pot 1, and the error circuit 10 is activated. It has become possible to take measures such as speeding up the process, and it is now possible to properly treat tar accumulation before it becomes severe.

Further, even if tar accumulates in the pot 1,
In most cases, since the fire extinguishing time is delayed due to the accumulation of tar, the amount of air blown before the fire extinguishing operation is continuously sent to the pot 1 during this time even if the fire extinguishing time is delayed due to the property of the fuel. No. 3 performed the post-purge operation, which prevented the problem that the balance between the combustion amount and the air amount was lost and soot was generated when the fire was extinguished.

Further, since the post-purge operation of the blower 3 is performed after confirming that the fire has been extinguished, it is not necessary to set the air flow corresponding to the combustion of the embers as in the case of starting from the fire extinguishing operation. Since it is sufficient to deal with only the amount of air to be blown later, the number of revolutions of the blower 3 can be reduced, and the sound of the combustor at the time of extinguishing becomes quiet.

Further, it is known that tar accumulates in the pot 1 easily under a condition of continuous operation for a long time with a small amount of combustion, and a save operation is a mode of continuous operation for a long time. In this invention, when the tar accumulation can be determined during the save operation, the save operation is stopped and the combustor is stopped, so that the tar is not accumulated so that the operator cannot process the tar.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device according to the present invention.

FIG. 2 is a sectional view of an oil combustor equipped with the present invention.

FIG. 3 is a flowchart of a control device according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pot 1 a small hole in pot side wall 2 wind tunnel 3 blower 4 oil tank 5 fuel pipe 6 fuel pump 7 frame electrode 8 flame detector 9 first timer 10 error circuit 11 second timer 12 save determination circuit

Claims (3)

(57) [Claims] 1. A pot 1 having a number of small holes 1a formed in a side wall.
Is mounted in a wind tunnel 2, a blower 3 for supplying combustion air into the wind tunnel 2 is provided, and an oil tank 4 and a pot 1 are connected by a fuel pipe 5, and a fuel pump is provided in the middle of the fuel pipe 5. In the combustor to which the flame detector 6 is attached, a flame detection device 8 having a frame electrode 7 whose tip is extended as an input is attached to the pot 1, and a first timer 9 for starting counting at the time of a fire extinguishing operation is provided. 6, the first timer 9 counts the flame detection time by the flame detection device 8, and when the flame detection continues for a predetermined time, an error circuit 10 is activated.
Activate the second timer 1 when the flame is no longer detected
1. The control device for a pot-type petroleum combustor, characterized in that the first timer 1 is operated and the blower 3 is operated in a post-purge operation until the second timer 11 counts up. 2. The blower 3 maintains the rotation speed immediately before the fire extinguishing operation while the flame detector 8 detects a flame, and sets the blower 3 to the post-purge rotation speed when the flame detection is stopped. The control device for a pot-type oil combustor according to claim 1, wherein: 3. The output of the second timer 11 is connected to the blower 3 and a save determination circuit 12, and when the second timer 11 counts up, the blower 3 stops operating, and the save determination circuit 12 determines that the save mode operation has failed. The operation of the circuit 10 is determined, the operation of the combustor is stopped while an error is being displayed, and the operation of the combustor is stopped while the save mode operation is being performed and no error is displayed, and a save standby operation is performed. The control device for a pot-type oil combustor according to claim 1.