JPH04316918A - Combustion control method - Google Patents

Abstract

PURPOSE:To obtain a combustion control device capable of burning again without any supply of liquid fuel when the residual amount of the liquid fuel has become insufficient. CONSTITUTION:In the case when an oil level detector detects that the residual amount of kerosene in an oil receiving tank 2 has reached a residual level which calls for the supply of kerosene, the combustion of a burner is halted once at the point of time when the amount of kerosene existing in the oil receiving tank 22 is still enough to allow the burner to start combustion again. Short time combustion is carried out again at a desired time by a user by means of an operation switch 18.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control device for a kerosene heater.

0002

2. Description of the Related Art FIG. 7 is a sectional view showing a remaining amount of kerosene detecting portion of a conventional oil heater disclosed in, for example, Japanese Utility Model Publication No. 1-29421, and FIG. 8 is a time chart showing its combustion control.

In the figure, 1 is a tray for kerosene for combustion, 2
3 is a float switch for detecting the remaining amount of kerosene in the oil pan 1, and 3 is a float of the float switch 2, which moves to follow the oil level in the oil pan 1. 4 is a lead wire of the float switch 2, and when the remaining amount of kerosene is above a predetermined amount (oil level 8 described later), the terminals of the lead wire 4 are short-circuited, and when it is below, they are open. . 5 is a kerosene cartridge tank, and 6 is an oil pipe that sends oil from the oil receiving tray 1 to the combustion machine.

Next, the operation will be explained. When there is sufficient kerosene, the kerosene is supplied from the cartridge tank 5 to the oil receiving tray 1, the oil level of the kerosene is at position 7, and the terminals of the lead wire 4 of the float switch 2 are short-circuited. As the kerosene gradually decreases, the kerosene in the cartridge tank 5 runs out and the supply stops, so the kerosene in the oil tray 1 decreases and drops from the kerosene level 7 to 8 directions. When the voltage drops to level 8, the terminals of the lead wire 4 of the float switch 2, which had been shorted until then, are opened. Based on the signal, the control device prompts the need for refueling with an indicator lamp and alarm buzzer, and after that, when the time T required for the kerosene to decrease to the oil level 9 slightly above the upper end of the oil pipe 6 is counted by a timer. , stop combustion. Here, oil level 9
indicates the level at which it is necessary to stop the oil supply in order to prevent impurities in the oil from being supplied from the oil supply pipe 6 and burned.

[0005]

[Problems to be Solved by the Invention] Conventional combustion control devices operate an indicator lamp and a warning buzzer when the remaining amount of kerosene in the kerosene tray 1 decreases to oil level 8, and notify the user of the need to refuel. However, if the user neglects to refuel or continues combustion without noticing despite this refueling notice, the combustion will stop when the remaining amount of kerosene reaches level 9. The engine will stop and, of course, will not be able to burn unless it is refueled afterwards, and even if the user wants to burn it temporarily for a short period of time, it will not be possible to burn it unless it is refueled, making it difficult to use. There was a problem with it being bad.

[0006] For example, if the remaining amount of kerosene reaches oil level 8 while the user is sleeping in winter, the user will be notified of refueling by the display lamp and alarm buzzer, and since the user is sleeping, No refueling was performed, and as a result, combustion continued and the kerosene tray 1
The remaining amount of kerosene in the tank reaches the oil level 9, and combustion is forcibly stopped completely to prevent impurities in the oil from burning. As a result, even if you try to start combustion for temporary short-term heating when you go to work early the next day, you will not be able to do so, and you will have to refuel on a cold winter morning, making it inconvenient to use.

[0007] This invention was made to solve the above-mentioned problem, and even when the remaining amount of kerosene in the oil tray is low, it is possible to temporarily burn the kerosene for a short time without replenishing the kerosene. The purpose is to obtain a combustion control device that is possible.

[0008]

[Means for Solving the Problems] A combustion control device according to the present invention includes a combustor that burns liquid fuel, an oil tray that stores a certain amount of liquid fuel to be sent to the combustor, and a residual amount detector that detects a predetermined residual amount level of liquid fuel; a timer that counts the combustion time of the combustor after detection by the residual amount detector; The combustor is equipped with a control section that temporarily stops combustion within a range where fuel is present, and then reburns the combustor.

[0009] Furthermore, the control section is configured to start and stop reburning at least once within the range where liquid fuel is present in the oil pan after the timer starts counting.

[0010] Furthermore, a combustion inhibiting part is provided for inhibiting combustion in the combustor, and when the cumulative count value by the timer reaches a value at which no liquid fuel exists in the oil pan,
The control section is configured to stop combustion in the combustor and inhibit re-combustion by the combustion prohibition section.

[0011]

[Operation] The combustion control device according to the present invention uses a residual amount detector to detect when the liquid fuel in the oil pan has decreased to a predetermined residual amount level, and uses a timer to count the time for subsequent combustion in the combustor. The control unit temporarily stops combustion while the liquid fuel remains in the oil pan, and then allows re-burning, so the liquid fuel can be used at any time when the user wants to perform heating by combustion. Temporary, short-term heating can be provided without replenishing.

[0012] Furthermore, by starting and stopping reburning while the liquid fuel remains in the oil tray by the control unit, the time width and number of reburnings can be adjusted according to the user's heating usage. Set freely.

Furthermore, when the liquid fuel in the oil pan is used up by the control section, combustion is stopped and re-combustion is prohibited, thereby preventing unstable combustion and heating, and also preventing deterioration of combustion. I'm here.

[0014]

[Example] Example 1. FIG. 1 is a block diagram of a combustion control device showing an embodiment of the present invention, FIG. 2 is a sectional view showing the structure of a combustion section of an oil heater,
FIG. 3 is a flowchart showing the operation of this combustion control device.
FIG. 4 is a time chart showing the time course of this operation. For details of the oil pan and its surroundings, see Figure 7.
Appropriate.

In the figure, reference numeral 10 denotes a microcomputer (hereinafter referred to as microcomputer) that performs various controls, and includes an input signal determination circuit 11, a timer section 12 that counts time, and a combustor restart prohibition section 13. , a display section/alarm section drive circuit 14, a combustion section drive circuit 15, and a combustion control circuit 16 for controlling these. Reference numeral 17 indicates a reed switch forming a part of an oil level detector 23 to be described later, and reference numeral 18 indicates a combustor operation switch, both of which are connected to the input signal determination circuit 11. 19 is a display lamp, 20 is a warning buzzer,
Both are connected to the display/alarm drive circuit 14. 21
is a combustor, and is connected to the combustion section drive circuit 15.

[0016] Also, an oil receiving tank 22, an oil level detector 23
, float 24, portable airtight kerosene tank 25, oil supply pipe 26
are the conventional oil pan 1, float switch 2, and
This corresponds to the float 3, cartridge tank 5, and oil pipe 6. 27 is a fuel filler cap with a valve that closes the mouth of the kerosene tank, 28 is a tank holder that opens the valve of the fuel filler cap, 29 is an electromagnetic pump,
30 is a return pipe, 31 is a vaporization section, 32 is a vaporization heater, 3
3 is a temperature detector for detecting the temperature of the vaporizer, 34 is an injection nozzle, 35 is an air control valve, and 36 is a burner head. Note that the oil level detector 23 indicates a remaining amount detector, the timer section, the timer microcomputer 10 indicates a control section, and the restart prohibition section 13 indicates a combustion prohibition section.

First, the operation of the combustor 21 will be explained using FIGS. 2 and 7. First, the portable airtight kerosene tank 25 containing kerosene, which is a liquid fuel, is connected to its oil cap 27.
When it is mounted on top of the oil tank 22 with the kerosene tank 25 facing down, the valve of the fuel filler cap 27 opens and oil is supplied from the kerosene tank 25 to the oil tank 22. At this time, the refueling is carried out in the airtight kerosene tank 2.
The kerosene level in the oil receiving tank 22 is maintained until the level of the kerosene in the oil receiving tank 22 reaches the opening surface of the fuel filler cap 27 due to the difference between the pressure inside the tank 5 and the atmospheric pressure. Then, when the operation switch 18 is turned on at the time when it is detected that the kerosene in the oil receiving tank 22 is at an oil level of 8 or more, the vaporizing heater 32 is energized and the vaporizing section 31 is heated. When the vaporization section 31 is heated to a predetermined temperature, this state is detected by the temperature detector 33. Based on this detection, the electromagnetic pump 29 is energized and driven.

When the electromagnetic pump 29 is energized, the kerosene in the oil receiving tank 22 passes through the oil supply pipe 26 and flows into the vaporizer 3.
1, where it is vaporized and gasified. This vaporized combustion gas is injected from the injection nozzle 34. At this time, combustion air is sucked in from the air control valve 35 along with the injection and is entrained in the fuel gas. The combustion gas accompanied by the combustion air is combusted in the burner head 36 to form a combustion flame.

Next, the operation of the combustion control device will be explained using FIGS. 1, 3, 4, and 7. First, step 61
At step 62, the operation switch 18 is turned on, and kerosene is combusted by the combustor 21 at step 62. And kerosene tank 25
After all the kerosene in the tank 22 is consumed, the kerosene in the oil receiving tank 22 is consumed and the oil level begins to fall. Here step 6
At step 3, it is checked by the oil level detector 22 whether the oil level has decreased to 8, which is the level at which refueling is required. Here, oil level 8
If the value has not decreased to 1, the process returns to step 62. Further, if the oil level has decreased to 8, the reed switch 17 is activated and it is detected that the remaining amount of kerosene is low (this time is set to t1).
), the input signal determination circuit 11 notifies the combustion control circuit 16 that the remaining amount of kerosene has decreased to a level that requires replenishment. Therefore, the combustion control circuit 16
2 to count time, and also sends a signal to the display/alarm drive circuit 14. Then, at step 64,
The timer unit 12 starts counting time, and step 65
The display lamp 19 is activated by the display/alarm drive circuit 14.
is flashed and an alarm buzzer 20 is sounded intermittently to notify the user that the remaining amount of kerosene is low. Next, in step 66, it is checked whether the timer section 12 has counted the time T1. If time T1 is not counted, the process returns to step 65. Further, if the time T1 is counted, the process proceeds to step 67, where the timer section 12 sends a signal to the combustion control circuit 16, and the combustion control circuit 16 sends a signal to the combustion section drive circuit 15, and once the combustion in the combustor 21 is stopped. After that, the operation switch 18 is operated to turn it off as shown in step 68. Here, the time T1 is set to a time period during which an amount of kerosene that can be recombusted remains in the oil receiving tank 22 even after combustion has stopped.

[0020] Then, any time t at which re-combustion is required
2, the operation switch 18 is turned on in step 69, the combustion control circuit 16 sends a signal to the combustion section drive circuit 15, and the combustion in the combustor 21 shown in step 70 is started to perform heating. As a specific example, even if the remaining amount of kerosene decreases while the user is sleeping and the combustion is stopped as shown in step 67, when the user wakes up the next morning, the combustor 2 as shown in step 70
1 can be used to heat the room and temporarily stave off the cold.

After starting reburning, the time count value by the timer unit 12 is cleared in step 71, and at the same time, the timer unit 12 starts counting the time T2 in step 72, and at the same time, the display unit/alarm unit drive circuit is cleared. 14 causes the display lamp 19 to blink and the alarm buzzer 20 to sound. Next, in step 72, it is checked whether the timer section 12 has counted the time T2. If the time T2 is confirmed (time t3), the process proceeds to step 73, where the combustion control circuit 16 sends a signal to the combustion section drive circuit 15 to stop combustion in the combustor 21. Here, time T2 is oil receiving tank 2
Set the time range to use up the kerosene in 2. Therefore, the total time that heating can be continued due to reburning is T2
becomes.

After stopping the re-combustion, the re-operation prohibition section 13 is set in step 74 to prohibit re-combustion by the combustor 21. Therefore, even if the operation switch 18 is turned on, re-combustion will not occur. Therefore, small dirt, dust, etc. that have settled at the bottom of the oil receiving tank 22 are removed from the oil supply pipe 26.
is not sent to the vaporization section 31 via the vaporization section 3.
It is possible to prevent the performance deterioration of item 1, and maintain combustion stability when the user replenishes kerosene and the prohibition on reburning is lifted.

Example 2. In addition, in Example 1 above, combustion was temporarily stopped at time T1, and then reburning was performed only once at time T2, but the time width of time T1 was shortened, and the remaining time was may be added to the reburning time T2.

FIG. 5 is a time chart showing this second embodiment. The operation is the same as in Embodiment 1 until the timer section 12 starts counting time, but the time T1
For example, time T1'(T1'< T1
), if the operation switch 18 is turned off and combustion is stopped, the subsequent re-burning continuation time T2+
Counting is started as (T1-T1'). Therefore, the time width of reburning can be made longer than the time T2 of the first embodiment. This allows the user to use the display lamp 19 and alarm buzzer 2.
0, I noticed that kerosene was being refilled, and the time elapsed was time T1.
If the operation switch 18 is turned off at an early stage before the combustion temperature reaches the maximum temperature, the time width of the reburning can be extended.

Example 3. Furthermore, if the user does not require re-combustion, combustion may be continued without being stopped even after the kerosene replenishment is reported. FIG. 6 is a time chart showing this third embodiment. Regarding the operation, if the time extension switch (not shown) is operated at time t2 before time T1 has elapsed after the timer section 12 starts counting the time T1, the counting time of the timer section 12 will increase to T1+T2. Be changed. Then, when the time T1 + T2 is counted, combustion is stopped and restarting is prohibited.

[0026] In Examples 1 and 2 above, re-combustion was performed at 1
Although we have explained the case where it is performed only once, the oil receiving tank 22
As long as there is kerosene left inside, it can be burned any number of times for a short period of time, and the user can freely set the combustion circuit according to the user's heating usage status.

[0027]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects.

After the detection by the remaining amount detector, the control section controls the amount of fuel within the combustion time period during which liquid fuel is present in the oil pan.
By once stopping combustion in the combustor and then performing combustion, the user can continue combustion without noticing that the remaining amount of liquid fuel is low, or without replenishing the liquid fuel even if the user notices, Even if combustion has stopped, try again.
Combustion can be temporarily started for a short time at a time desired by the user, improving usability.

Furthermore, by starting and stopping reburning using the control unit, the time width and number of reburnings can be freely set in accordance with the user's usage of heating using the combustor. Expands its uses.

Furthermore, if there is no liquid fuel in the oil pan, the control section stops combustion and prohibits re-combustion, thereby preventing impurities from entering the combustor through the liquid fuel. , it is possible to prevent combustor performance deterioration and maintain combustor performance.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a combustion control device showing a first embodiment of the present invention.

FIG. 2 is a sectional view of a combustion section showing Embodiment 1 of the present invention.

FIG. 3 is a flowchart showing Embodiment 1 of the present invention.

FIG. 4 is a time chart showing Embodiment 1 of the present invention.

FIG. 5 is a time chart showing a second embodiment of the invention.

FIG. 6 is a time chart showing a third embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a portion for detecting the remaining amount of kerosene in a conventional kerosene heater.

FIG. 8 is a time chart showing conventional combustion control.

[Explanation of symbols]

1 Oil saucer 2 Float switch 3 Float 4 Lead wire 5 Cartridge tank 6 Oil pipe 7 Oil level (high position) 8 (middle position) 9 (low position) 10 Microcomputer 11 Input signal judgment circuit 12 Timer section 13　Re-operation prohibition section 14 Display/alarm drive circuit 15　Combustion part drive circuit 16 Combustion control circuit 17 Reed switch 18 Operation switch 19 Indication lamp 20 Alarm buzzer 21 Combustor 22 Oil receiving tank 23 Oil level detector 24 Float 25 Airtight kerosene tank 26 Oil supply pipe 27 Fuel filler cap 28 Tank pedestal 29 Electromagnetic pump 30 Return pipe 31 Vaporization section 32 Vaporization heater 33 Temperature detector 34 Injection nozzle 35 Air control valve 36 Burner head

Claims (3)

[Claims] Claim 1: A combustor that burns liquid fuel, an oil pan that stores a certain amount of the liquid fuel to be sent to the combustor, and a residual amount that detects a predetermined residual level of the liquid fuel in the oil pan. a detector, a timer for counting the combustion time of the combustor after detection by the remaining amount detector, and a timer for temporarily stopping combustion within the range where liquid fuel exists in the oil pan after the timer starts counting. , and a control section that then re-combusts the combustor. 2. The control unit is configured to start and stop reburning at least once within the range where liquid fuel is present in the oil pan after the timer starts counting. The combustion control device according to item 1. 3. A combustion inhibiting section for prohibiting combustion in the combustor, and stopping combustion in the combustor when the accumulated count value by the timer reaches a value at which no liquid fuel exists in the oil pan. 3. The combustion control device according to claim 1, wherein the control section includes a control section for causing the combustion inhibiting section to inhibit re-combustion.