JP2522072B2 - heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heater, and more particularly to control of a combustion amount.

[Prior Art] Generally, a heater having a combustion function includes a stove that uses oil and gas as a fuel, a fan heater, and the like. However, the description of the prior art will be given using a petroleum fan heater.

FIG. 3 is a block diagram of a micro-computer (hereinafter referred to as a microcomputer) showing a combustion amount control means of a general petroleum fan heater and its surroundings. In this block diagram, a flame detector showing a misfire detection means is included. I'm out.

FIG. 4 is a configuration diagram of a burner showing a general combustion means and its periphery, and FIG. 5 is a flow chart showing a conventional operation of the micro and its periphery.

In the figure, (1) is a microcomputer for instructing various operations of the petroleum fan heater, and includes combustion amount control means for controlling the combustion amount of the combustion means shown in FIG. (2) to (6) are switching means composed of a relay or the like operated by the microcomputer (1), (7) is a vaporizing cylinder for heating and vaporizing fuel kerosene, (8) is preheating the vaporizing cylinder (7) Heater, (9) vaporization tube temperature sensor for detecting the temperature of the vaporization tube (7), (10) a cartridge type fuel tank for storing kerosene, (11) temporarily the kerosene from the fuel tank (10) , A sub tank for storing in (12), an oil leveler (12) for storing kerosene to be sent to the vaporizing cylinder (7) through the fuel pipe (13),
(14) is an electromagnetic pump that pumps kerosene from the sub-tank (11) to the oil leveler (12), and (15) is a ventilation pipe (16) that takes in air from the outside and sends the air to the vaporization cylinder (7). A pressure hose that sends air to the oil level gauge (12) to pressurize the liquid level, (17) is a valve that is provided in the pressure hose (15) and that changes the amount of air sent to the constant oil level gauge (12) , (18) is a valve (17)
The pressure solenoid that performs the operation of (19) takes in air from the outside, and blows fan A, (20) that sends air to the blower pipe (15) and the pressure hose (16) uses blower fan A (19). The blower motor to be rotated, (21) is an air filter for removing dust and the like in the air taken into the ventilation pipe (15) by the blower fan A (19), and (22) is a combustion means for burning vaporized kerosene. The burner, (23), mixes air with the heat produced by combustion to create warm air.
A blower motor that rotates a blower fan B (not shown) that takes in outside air above the burner (22), a (24) spark discharge on the burner (22), and an ignition transformer that ignites vaporized kerosene ( 25) is a room temperature sensor that detects the temperature of the room where the oil fan heater is placed, (26) is a flame detector as a misfire detection means that detects misfire, and is located on the burner (22) and above the burner (22). Electrodes are provided and a voltage is constantly applied between the electrodes. During combustion, a current flows between the electrodes with the flame generated between the electrodes as a medium, and at the time of misfire there is no flame naturally, so there is no flame between the electrodes. The current stops flowing, and the misfire state is detected by the presence or absence of current flowing through this flame.

Next, the conventional operation in the microcomputer (1) will be described with reference to the flow chart of FIG.

First, at step S ₁ in FIG. 5, the switching means (3) is operated to energize the heater (8) and vaporize the cylinder (7).
Preheat. Then, if more than a predetermined temperature detected vaporization cylinder temperature of vaporization tube (7) (7) can be vaporized kerosene by a temperature sensor (9) vaporizing tube at step S _2, switching-means in step S ₃ ( 4) is operated, the electromagnetic pump (14) is operated, and from the fuel tank (10) to the sub tank (1
The kerosene stored in 1) is pumped up to the constant oil level gauge (12) and stored in the constant oil level gauge (12). Next, at step S _{4, the} switching means (2) is operated to energize the blower motor (20) to rotate the blower fan A (19), and the air filter (21) removes dust and dust from the blower pipe ( 15) Send in.

Next, at step S _{5, the} switching means (6) is operated to energize the blower motor (23) to rotate the blower fan B,
Take air in above the burner (22). At the same time, performs a spark discharge is energized at step S ₆ the switching-means (5) is operated ignition transformer (24) onto the burner (22), and energizes the pressing solenoid (18) at step S ₇ , Open the valve (17) and let the pressure hose (16) ventilate.
Pressure is applied to the liquid level of kerosene in the oil level gauge (12). As a result, kerosene is sent out through the fuel pipe (13) into the vaporization tube (7) at high temperature and vaporized, and at the same time mixed with the air sent into the vaporization tube (7) through the blower pipe (15). By doing so, the kerosene becomes a gas, and the above spark discharge ignites the burner (22) and forms a flame.

When a flame is generated, the process moves from step S ₈ to step S ₉ to generate hot air by mixing the air generated from the blower fan B with the hot air generated by this flame. After that, the power to the ignition transformer (24) is stopped and the spark discharge is stopped. It should be noted that, when the flame has failed to occur returns from step S ₈ to step S _3. Next, when the desired room temperature is set, step S
_{At 10, the} room temperature is detected by the room temperature sensor (25),
The amount of air and kerosene fed into the vaporization cylinder (7) by comparing the set desired room temperature and controlling the operation of the switching means (2) by this temperature difference to change the rotation speed of the blower motor (20). To control the amount of combustion.

Here, when a misfire in the combustion is detected misfire state by flame detector at step S _11, and stops energizing the migrated electromagnetic pump to step S ₁₂ (14), a forward following add connexion Blower motor (20) at step S ₁₃ , step S ₁₄
Blower motor at (23), to stop the energization of the pressure solenoid (18) in step S _15. Thereafter, counting the elapsed time in step S _16, if a predetermined time has elapsed step
Energized again electromagnetic pump (14) at S _17, following the blower motor (20) (step S _18), the blower motor (23) (step S _19), ignition transformer (24) (step S ₂₀₎ pressure solenoid ( 18) Energize (step S ₂₁ ) to turn on step S ₂₂
After flame formation at stops the power supply to the ignition transformer at step S _23. Then perform combustion amount control so that the room temperature set temperature in the same manner as step S ₁₀ in step S _24. If misfires again in has occurred, is performed again misfire detection at step S _25, to indicate that an abnormality at step S _26, to terminate the combustion out the operation stop instruction at step S _27. The series of abnormal operations are all controlled by the microcomputer (1).

[Problems to be Solved by the Invention] A conventional heater is configured as described above, and when the heating load is small, heating by the minimum combustion amount is performed by controlling the combustion amount. Is easily misfired. For example, even if the blower motor (20) temporarily stalls or the air in the fuel pipe (13) mixes with the source of vaporization cylinder (7) due to the source of the fuel, it will be misfired. Although the ignition operation is performed again, when the above-mentioned momentary fuel supply stop state occurs again, there is a problem that re-misfire occurs and heating by the minimum combustion amount is not stable.

The present invention has been made to solve the above problems, and when reignition is performed at the time of misfire during heating,
The purpose of the present invention is to obtain a heater that stabilizes heating without causing a fire again.

[Means for Solving the Problems] A heater according to the present invention has a combustion means and a misfire detection means for detecting a misfire during combustion by the combustion means,
When a misfire is detected by the misfire detection means, an operation stop operation is performed, and after a lapse of a predetermined time from the operation stop operation, a restart is automatically started in the heating machine. At this time, the combustion amount control means for resetting the combustion amount of the combustion means to a value larger than the combustion amount before the misfire is provided.

In addition, a misfire number detecting means for detecting the number of misfires is provided,
The combustion amount control means resets the combustion amount when the misfire number detecting means counts a predetermined number of times.

Further, it has a combustion means and a misfire detection means for detecting a misfire during combustion by the combustion means.When the misfire is detected by the misfire detection means, an operation stop operation is performed, and a predetermined operation is started from the operation stop operation. When a misfire is detected during combustion with the minimum combustion amount by the combustion means in a heater that automatically restarts after the passage of time, the preset minimum combustion amount of the combustion means is set. The combustion amount setting means for resetting the value to a larger set value than that is provided.

[Action]

The heater according to the present invention, when misfired during heating, prevents misfire again after reignition by resetting the combustion amount to a value larger than the combustion amount before the misfire,
Stabilize the heating.

Further, by resetting the combustion amount when a certain number of misfires occur during combustion, it is not reset when a misfire is caused by a non-reproducible peculiar cause.

In addition, when misfire is detected during combustion with the minimum combustion amount, by resetting the preset minimum combustion amount setting value to a larger setting value, it is possible to set Stabilize driving.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

First, a first embodiment of the heater of the present invention will be described.

FIG. 1 is a flow chart showing the operation of the microcomputer (1) and its peripherals. The block diagram of the microcomputer (1) and its surroundings, the configuration diagram of the burner and its surroundings
The description is omitted because it has been described above with reference to FIGS.

The combustion amount control means in the microcomputer (1) of the present invention in the block diagram of FIG. 3 resets the set value of the minimum combustion amount to a value larger than that before the misfire when a misfire occurs during heating by the minimum combustion amount. It has a setting function.

Next, the operation of the first embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. 3 and 4.

First, in FIG. 1, the ignition operation of steps S _{1 to} S ₉ until the heater (8) is energized to form a flame and the ignition transformer (24) is de-energized is shown in FIG. The description is omitted because it is the same as or equivalent to the operation.

Then is performed the control of the combustion amount in step S _10, i.e. to increase or decrease the kerosene amount for sending the rotational speed of the blower motor (20) variable is vaporized barrel to (7), then the room temperature is equal to the desired set temperature And when the heating load becomes small. Heating is performed with the minimum amount of combustion. When the blower motor (20) is temporarily stalled or the air in the fuel pipe (13) is mixed at the time of minimum combustion in step S ₁₁ , the supply of kerosene to the vaporization cylinder (7) is momentarily stopped. Originally, the amount of kerosene supplied was small and the supply stopped state overlapped, resulting in misfire, and the flame detector detects the misfire. Followed by a re-set the minimum combustion amount of set values stored in advance to a value greater than the previous misfire at step S by connexion microcomputer misfire detected in ₂₈ (1). Thereafter, similarly to the conventional example step S ₁₂ ~
Once stops energizing the burner (22) peripheral portion at step S _23, after a predetermined time has elapsed, performs energization to re-burner (22) peripheral portion, re-ignited to form a flame. Then, in step S _29, when the heating is performed again, the microcomputer (1)
Based on the newly set minimum combustion amount, the minimum supply amount of kerosene to the vaporization cylinder (7) is increased, and the minimum combustion with tolerance to the above instantaneous supply stop of kerosene is performed. If a misfire occurs even if the minimum combustion amount is increased,
Misfire due to causes other than kerosene supply amount since it is considered to stop the combustion operation at step S ₂₇ performs abnormality display at step S ₂₆ detects the misfire at step S _25.

Here, the set value of the minimum combustion amount, which is larger than the initial value stored in the microcomputer (1), is set by the reset operation to the microcomputer (1) by the insertion / removal of the outlet of the oil fan heater or the reset switch operation. Although it returns to the set value, it is not cleared by other operations, such as turning the power switch on and off.

In the first embodiment described above, once misfire occurs during minimum combustion, the set value of the minimum combustion amount is forcibly made larger than before the misfire during re-ignition to prevent misfire. , Even if a misfire occurs once, the minimum combustion amount setting value is not increased immediately and re-ignition is performed with the same minimum combustion amount setting.
The set value of the minimum combustion amount may be increased only when the re-combustion is performed and the misfire state is repeated a predetermined number of times. As a result, it is possible to prevent resetting of the minimum combustion amount due to a non-reproducible cause in the early stage of heating operation, for example, misfire due to dust adhering to the burner (22), and to prevent consumption of kerosene in excess of the required amount. This embodiment will be referred to as a second embodiment, and its operation will be described with reference to FIGS. 2, 3, and 4.

In FIG. 2, the operations from ignition to misfire in steps S _{1 to} S ₂₆ are the same as or equivalent to those in FIG. Next step S ₂₀
In step 1, the number of misfires is counted, and even if the number of misfires reaches the predetermined number, the minimum combustion amount in the microcomputer (1) remains at the initial setting value and the process returns to step S ₃ to reignite and try to recombust. Further, when a misfire count has reached the predetermined number of times, the process proceeds to step S _28, it resets the set value of the minimum combustion amount in the microcomputer (1) to a value greater than the previous misfire. Then step
And re-ignition as in the conventional example in S ₁₇ ~ step S _23, performs heating by combustion amount greater than the initial set value at the minimum combustion at step S _29, to prevent misfire. In addition,
When misfire even by increasing the minimum combustion amount performs abnormality display at step S ₂₆ detects the misfire by similarly step S ₂₅ and Figure 1, to stop the combustion operation at step S _27.

In the first and second embodiments, the minimum combustion amount is increased only once at the time of misfire, but as the third embodiment, the set value of the minimum combustion amount is increased stepwise and The setting value at the time of burning and without misfire may be stored in the microcomputer (1), an accurate minimum combustion amount can be set, and unnecessary consumption of combustion can be prevented.
The use efficiency of fuel can be improved.

In the first to third embodiments, the oil fan heater for burning kerosene for heating is explained. However, other heaters having combustion means, such as oil stove, gas stove, gas fan heater, etc. Of course, the same effects as those of the first to third embodiments can be obtained.

[Effects of the Invention] As described above, according to the present invention, in a heater, when a misfire occurs due to a momentary fuel supply stop during heating, the combustion amount is set to be larger than the combustion amount before the misfire. Can prevent misfire again after re-ignition,
There is an effect that stable heating can be performed and the heating function can be improved.

Further, by resetting the combustion amount when a predetermined number of misfires occur during combustion, it is possible to prevent resetting due to a non-reproducible peculiar cause and prevent unnecessary fuel consumption.

In addition, when misfire is detected during combustion with the minimum combustion amount, by resetting the preset minimum combustion amount setting value to a larger setting value, it is possible to set Stable heating can be performed even during operation.

[Brief description of drawings]

FIG. 1 is a flow chart showing the operation of the combustion amount control means of the first embodiment of the heater of the present invention, and FIG. 2 is the operation of the combustion amount control means of the second embodiment of the heater of the present invention. FIG. 3 is a block diagram of the combustion amount control means of the conventional heater, FIG. 4 is a block diagram of the conventional combustion means and its surroundings, and FIG. 5 is a combustion amount control means of the conventional heater. It is a flow chart showing the operation. In the figure, (1) is a micro computer, (22)
Is a burner, and (26) is a flame detector. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

(57) [Claims] 1. A combustion means and a misfire detection means for detecting misfire during combustion by the combustion means. When a misfire is detected by the misfire detection means, an operation stop operation is performed to stop the operation. In a heater that automatically restarts after a predetermined time has passed from the operation, when starting the restart, the combustion amount of the combustion means is reset to a value larger than the combustion amount before the misfire. A heater having a combustion amount control means for setting. 2. A misfire number detecting means for detecting the number of misfires is provided, and when the misfire frequency detecting means counts a predetermined number of times,
The heater according to claim 1, wherein the combustion amount control means resets the combustion amount. 3. A combustion means and a misfire detection means for detecting a misfire during combustion by the combustion means. When a misfire is detected by the misfire detection means, an operation stop operation is performed to stop the operation. In a heater that automatically restarts operation after a lapse of a predetermined time from the operation, when misfire is detected during combustion with the minimum combustion amount by the combustion means, the preset combustion means A heater comprising a combustion amount setting means for resetting a set value of the minimum combustion amount to a larger set value.