JPH0623608B2 - Combustion amount control device for combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a combustion device, and in particular, when the room temperature is low, the combustion amount is temporarily increased from the rated value to set the room temperature. The present invention relates to a combustion amount control device for a combustion device that raises the temperature in a short time.

(Prior Art) For example, in a heating combustion device such as an oil fan heater used in general households, fuel such as oil is sent from a fuel tank to a vaporizer through an electromagnetic pump, and the vaporizer vaporizes the fuel. After that, it will be supplied to the burner. The amount of combustion in such a fuel system is adjusted by changing the rotation speed of the electromagnetic pump. And
If the temperature at room temperature when the combustion device is started has not reached the set temperature set by the operator, the electromagnetic pump is operated at the rated (strong) speed and the combustion amount is automatically set to [strong]. Once the room temperature rises to around the set temperature, the rotation speed of the electromagnetic pump changes and the combustion amount changes to [medium].
After that, the combustion amount is variably controlled to [medium] or [weak] so that the room temperature becomes constant at the set temperature.

Note that the above rated (strong) combustion amount causes the temperature inside the combustion device to rise abnormally or the temperature of the hot air output from the combustion device to rise abnormally even if the combustion device is continuously operated at this rated combustion amount for a long time. This is the maximum combustion amount under the condition that this combustion device can be operated safely with a certain margin without causing any trouble.
Therefore, it is not normally operated in a state where the rated value is exceeded.

(Problems to be Solved by the Invention) However, even in a combustion amount control device that controls the combustion amount to be switched between [strong], [medium], and [weak] by adjusting the fuel supply amount in multiple stages as described above. There were the following problems. That is, when the temperature of the room is considerably lower than the set temperature, for example, when the temperature of the room is considerably lower than the set temperature, such as when the switch of the combustion device is turned on when returning home from the outside, etc. However, it took a lot of time for the room temperature to rise to a comfortable set temperature even if it was operated in the [strong] combustion amount state.

In order to avoid this problem, it is sufficient to operate at a combustion amount that exceeds the rated combustion amount of the above [strong] until the room temperature reaches the set temperature. Security problems arise.

The present invention has been made based on such circumstances, and its object is to operate by operating at a combustion amount exceeding the rating until the temperature rises to a certain temperature or only within a certain time when the room temperature is low. , Without compromising safety
An object of the present invention is to provide a combustion amount control device for a combustion device that can raise the room temperature to a set temperature in a short time.

[Configuration of the Invention] (Means for Solving Problems) In the combustion amount control device of the combustion device of the present invention, when the room temperature is equal to or lower than a predetermined limit temperature lower than the set temperature, the fuel supply amount is the rated load fuel supply. If the overload fuel supply amount exceeds the set amount, the room temperature reaches the limit temperature after the overload fuel supply amount is set, and the elapsed time after the fuel supply amount is set to the overload fuel supply amount is specified. The fuel supply amount is changed to the rated load fuel supply amount when at least one of the two conditions, that is, the condition in which the allowable time is reached is satisfied.

(Operation) With the combustion amount control device of the combustion device configured as described above, the fuel supply amount exceeds the rated load fuel amount when the room temperature when the combustion device is started is below a predetermined limit temperature. Since the amount of fuel is overloaded, it is operated with a combustion amount that exceeds the rating [strong]. If the room temperature reaches the limit temperature within the allowable time, or if the allowable time elapses before the room temperature reaches the limit temperature, the operating condition exceeding the rating is canceled and the normal rated [strong] combustion amount condition is reached. Return.

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

FIG. 1 is a block diagram showing a schematic configuration of a combustion amount control device for a combustion device according to an embodiment. That is, reference numeral 1 in the figure is a microprocessor (MPU) incorporating an arithmetic circuit, a command register, a storage unit, a timer, an input / output port and the like. The temperature signal from the room temperature detection circuit 2 is input to the input port AD1 of this microprocessor (hereinafter abbreviated as MPU) 1, and the temperature signal from the temperature setting circuit 3 set by the operator is input to the input port AD2. , Input port AD3
A temperature signal from the heater temperature detection circuit 4 of the heater of the carburetor in the apparatus is input to.

In the room temperature detection circuit 2, the potential at the connection point between the thermistor 2a and the resistor 2b interposed between the DC + Vc control voltage terminal and the ground is input to the input port AD1 as a temperature signal indicating room temperature. In the temperature setting circuit 3, the potential of the variable terminal of the variable resistor 3b in the series circuit including the resistor 3a, the variable resistor 3b, and the resistor 3c interposed between the DC + Vc control voltage terminal and the ground is equal to the set temperature. The temperature signal is input to the input port AD2. Further, in the heater temperature detection circuit 4, the potential at the connection point between the thermistor 4a and the resistor 4b inserted between the control voltage terminal of DC + Vc and the ground is input to the input port AD3 as a temperature signal indicating the heater temperature of the carburetor. It has been entered.

Further, the heater 6 of the carburetor is connected from the output port P0 of the MPU 1 to the base of the transistor 5b via the resistor 5a.
A heater signal for controlling energization is sent. The collector of the transistor 5b is connected to the drive power supply terminal of direct current + V _D via the drive coil 7a of the relay, and the emitter is grounded. Further, the heater 6 of the vaporizer is connected to the AC power source 8 via the contact 7c of the relay.

Further, a fan motor signal for driving and controlling the fan motor 10 for sending warm air to the room is sent to the base of the transistor 9b through the output port P1 of the MPU1 and the resistor 9a. The collector of the transistor 9b is connected to the drive power supply terminal of direct current + V _D through the drive coil 11a of the relay, and the emitter is grounded. Further, the fan motor 10 is connected to the AC power supply 12 via the contact 11b of the relay.

Further, a frequency signal for controlling the rotation speed of the electromagnetic pump 14 is sent from the output port P2 of the MPU 1 to the base of the transistor 13b via the resistor 13a. The collector of the transistor 13b is connected to the drive power supply terminal of direct current + V _D via the light emitting diode 15a and the resistor 16 which form a photocoupler, and the emitter is grounded. A collector and an emitter of a phototransistor 15b, which constitutes a photocoupler together with the light emitting diode 15a, are connected to an electromagnetic pump drive circuit 17 which drives and controls the electromagnetic pump 14.

The electromagnetic pump 14 controls the amount of fuel supplied from the fuel tank to the carburetor. When the rotational speed increases, the fuel supply amount increases, and when the rotational speed decreases, the fuel supply amount decreases. The rotation speed of the electromagnetic pump 14 is determined by the frequency input to the electromagnetic pump drive circuit 17 via the phototransistor 15b. That is, the MPU 1 can control the rotation speed of the electromagnetic pump 14, that is, the combustion amount of the combustion device by changing the load combustion frequency F output from the output port P2. In the embodiment, the combustion amount is set to [weak], [medium], rated [strong] and this rating [strong].
It can be set to overload that exceeds the limit.

In addition, a storage unit that stores a flag indicating whether or not to operate the electromagnetic pump 14 in the [overload] state in the MPU 1 and a time elapsed since the electromagnetic pump 14 starts operating in the [overload] state A timer or the like for measuring the time T is stored.

Further, in this embodiment, the permissible time of the elapsed time T measured by the timer is programmed to be 30 minutes when the combustion device is set. Similarly, the limit temperature is programmed to be 20 ° C. at the time of design. Normally, this limit temperature is set to a value considerably lower than the set temperature set by the operator.

Thus, the MPU 1 is programmed so as to execute the main routine of FIG. That is, when the activation switch is turned on, an H level heater signal is sent from the output port P0 to drive the transistor 5b, the drive coil 7a of the Ray, and the contact 7b to control the heater 6 of the carburetor to be energized. Then, the process proceeds to S1 and the input port A
It is checked whether or not the heater temperature input to D3 has reached the specified combustion startable temperature. If the combustion start temperature has not been reached, the flag stored in the storage unit of the MPU 1 is reset to 0, and the timer of the built-in timer is reset to 0. Then, the timer restarts counting from 0. Then, the process returns to the original main routine.

When the heater temperature reaches the temperature at which combustion can start in S1, S
In step 2, the setting state of the flag in the storage section is checked. Then, if the flag remains cleared to 0, the elapsed time T counted by the timer is checked. Then, if the elapsed time T in S3 has not reached the preset allowable time of 30 minutes, the room temperature input to the input port AD1 is read and compared with the preset limit temperature of 20 ° C.
When the room temperature detected in S4 has not reached the limit temperature of 20 ° C., the overload combustion frequency F, which is the frequency for operating the electromagnetic pump 14 in the [overload] state from the output port P2 in S5. Output _H. At the same time, an H level fan motor signal is sent from the output port P1 to start the rotation of the fan motor 10. Then, the electromagnetic pump 1
No. 4 starts operation in the [overload] state that exceeds the [strong] rated state. As a result, the amount of fuel supplied to the carburetor increases, and the combustion device starts in the [overload] combustion state exceeding [strong]. Therefore, room temperature rises at a faster rate than in normal [strong] combustion conditions.

Further, when the elapsed time T of the timer reaches the allowable time of 30 minutes in S3, or the room temperature detected in S4 is the limit temperature 2
When the temperature reaches 0 ° C., it is necessary to cancel the operating state of the [overload] combustion amount, so the flag is set to 1.

Then, if the flag is set to 1 in S2, it is determined that the operation state of the [overload] combustion amount has been canceled,
A normal load frequency other than the overload combustion frequency F _H is sent from the output port P2. Then, the combustion device is operated at the normal [strong] [medium] [weak] combustion amount determined by the relationship between the detected room temperature and the set temperature input to the input port AD2. That is, since the temperature difference between the room temperature and the set temperature is large immediately after the [overload] operation state is released, the operation is performed in the [strong] rated combustion amount state, and once the room temperature rises to the set temperature, [ It can be switched to medium or weak. After that, the room temperature is variably controlled to [medium] or [weak] so as to maintain the set temperature.

FIG. 3 is a diagram showing the relationship between the elapsed time T after ignition and the amount of combustion. That is, when the room temperature at the start of operation is significantly lower than the limit temperature of 20 ° C., the operation is performed in the [overload] state in which the rated [strong] is exceeded and the allowable time is 30 minutes or less within 30 minutes after ignition. If it exceeds the minutes, it will be operated in the rated [strong] state. The dotted line in the figure shows the case where the conventional apparatus is operated only in the [strong] state from the beginning.
If the room temperature at the start of operation is slightly lower than the limit temperature of 20 ° C and the room temperature reaches the limit temperature within 30 minutes after ignition, the rated value is [strong] until the room temperature reaches the limit temperature. When the temperature reaches the limit temperature, it is operated in the rated [strong] state.

With the combustion amount control device of the combustion device configured as described above, if the room temperature at the time of operation is below the limit temperature, the operation is performed in the [overload] state exceeding the rated [strong]. Rise to. In addition, since the operating time in the [overload] state is regulated by a double condition of the room temperature at that time and the elapsed time from the start of operation, the temperature inside the device and the temperature of the hot air are abnormally increased. There will be no safety problems such as. In addition, since the operation in the [overload] state does not continue after the room temperature exceeds the limit temperature, even if the room temperature has already reached the limit temperature and it feels warm, Fuel is never wasted.

(Effect of the Invention) As described above, according to the present invention, when the room temperature is low, the combustion amount exceeding the rating is operated until the temperature rises to a certain temperature or within a certain period of time. Therefore,
It is possible to raise the room temperature to the set temperature in a short time without sacrificing safety and wasting fuel.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a combustion amount control device for a combustion device according to an embodiment of the present invention. FIG. 1 is a block diagram showing a schematic configuration, FIG. 2 is a flow chart showing an operation, FIG. 3 is a time characteristic diagram of the combustion amount. 1 ... MPU, 2 ... Temperature detection circuit, 3 ... Temperature setting circuit, 4 ... Heater temperature detection circuit, 6 ... Heater, 10 ...
… Fan motor, 14 …… electromagnetic pump.

Claims (1)

[Claims] 1. A combustion amount control device for a combustion device, which controls a fuel supply amount to a burner so that the room temperature reaches a set temperature in accordance with the room temperature of a room to be heated, and the predetermined room temperature is lower than the set temperature. Overload setting means for setting the fuel supply amount to an overload fuel supply amount exceeding the rated load fuel supply amount when the temperature is equal to or lower than the limit temperature, and the fuel supply amount becomes the overload fuel supply amount by the overload setting means. Of the two conditions, the condition that the room temperature has reached the limit temperature after being set and the condition that the elapsed time after the fuel supply amount is set to the overload fuel supply amount has reached a predetermined allowable time A combustion amount control device for a combustion device, comprising: a fuel supply amount changing means for changing the fuel supply amount to the rated load fuel supply amount when at least one condition is satisfied.