JPH0561529B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a control device for a combustion appliance such as an oil fan heater.

BACKGROUND OF THE INVENTION A conventional combustion appliance, such as an oil fan heater, has a fixed tank 3 and a burner 4 inside an exterior 1 and a bottom plate 2, as shown in FIG. Combustion gas A burned in the burner 4 is mixed with indoor air B by a fan 6 attached to a blower motor 5, and is blown out from a louver 7 as warm air C, which is used to heat the room.

FIG. 5 shows details of the fixed tank 3 shown in FIG. 4. A movable tank 9 is disposed at the oil filler port 8 of the fixed tank 3, and a float switch 10 for detecting the oil level is connected to the burner 4. A pump 11 for supplying oil is attached. FIG. 6 shows a control circuit for this combustion appliance, in which a control circuit 131 is connected to the AC power source 12 between its ends a and b, and a series circuit is connected between the contact 14 and the heater 15 for vaporizing kerosene in the burner 4. , a series circuit between the contact 16 and the warm air blower motor 5 and a burner motor 17 connected in parallel thereto for supplying combustion air into the burner 4; a contact 18 and the electromagnetic pump 11 for supplying fuel to the burner;
A series circuit with an igniter 19 for igniting the kerosene vaporized in the burner 4 is connected in parallel to this. The control circuit 131 also includes a float switch 10 as an oil level sensor,
Sensors such as a burner thermistor 20 for detecting the temperature of the burner 4 and an operation switch 21 are connected.

In such a configuration, by closing the operation switch 21, the control circuit 131 operates the contact 14 to energize the heater 15, and the burner thermistor 20 causes the temperature of the burner 4 to reach the temperature required to vaporize kerosene. After detecting that
6 and 18 to rotate the burner motor 17 and the blower motor 5, and then the electromagnetic pump 11 and the igniter 1
9 operates to burn kerosene in the burner 4. In such combustion, as shown in FIG. 5, while the oil remains in the movable tank 9, the oil level maintains the height A, but the oil level in the fixed tank 3 gradually increases. float switch 10 float 22
When the oil level B drops to the OFF point, that signal is input to the control circuit 131, which automatically stops combustion after a certain period of time. Then, when the movable tank 9 is filled with kerosene and the fixed tank 3 is refueled,
When the oil level in the fixed tank 3 gradually increases and the float 22 of the float switch 10 reaches the ON point, that signal is input to the control circuit 131,
It becomes ready to drive.

Problems to be Solved by the Invention However, during refueling, it takes time for the oil level to rise until the float switch 10 is turned ON again, and during that time, the control circuit 131 does not accept operation commands caused by closing the operation switch 21. However, there was a problem in that the user had to wait until the float switch 10 was turned on, and then the operation switch 21 had to be turned on to start operation.

The present invention solves such conventional problems,
If the operation switch is turned on at the same time as oil is refilled after the oil has stopped running out, the operation command signal will be accepted and operation can be started immediately. This is what I did.

Means for Solving the Problems In order to solve the above problems, the combustion appliance control device of the present invention receives a signal from an oil level sensor and sends an operation command signal even if the oil level check means is not ON. At the same time, the burner is preheated, and at the same time, the timer is operated and after a certain period of time, the oil level check means is checked to see if it is turned on.If it is turned on, after preheating is completed, the oil supply pump is activated. It is configured to operate normally and to stop operation if it is OFF.

Effect The present invention has the above-mentioned configuration so that after refueling, the burner is preheated by simply turning on the operation switch without waiting for the oil level check means to be turned on, and the burner is preheated until the refueling is sufficiently performed. After that, if the oil level check means is ON, after preheating is completed, the pump is operated to start combustion. If it is not refueled and the oil level check means is OFF, it is safe because it will stop operation again.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Parts that are the same as those in the conventional example will be given the same reference numerals, detailed explanations will be omitted, and different parts will be mainly explained. Further, FIG. 5 of the conventional example will also be used to explain the present invention.

In FIGS. 1 and 2, the control circuit 13 includes a timer means 2 that does not allow input of a signal from the float switch for a certain period of time when the operation switch 21 is turned on.
3, a preheating control means 24 for controlling the heater 15 for preheating the burner 4, and the timer means 23, when the timer means 23 time up, the operation is stopped if the oil level is below B (predetermined value) according to a signal from the float switch 10. , an oil level check means 25 outputs a signal indicating that combustion is possible if the oil level is B or higher, and if the oil level is B or higher based on the signal from the oil level check means 25, the pump is operated after checking whether preheating is completed. and combustion control means 26 for controlling combustion. Next, the microcomputer 13a, which constitutes the main body of the control circuit 13, is configured to perform the sequence operation shown in the flowchart of FIG. In step S1, the operation switch 21
The ON/OFF status of is confirmed, and if it is OFF, the process waits at step S1, and if it is ON, the process proceeds to step S2. In step S2, the float switch non-detection timer, which counts the time during which no signal is input from the float switch 10, is initialized and starts counting, and the process proceeds to step S3. Contact 1 in step S3
4 is closed, the heater 15 is energized to preheat the burner 4, and the heater 15 is turned on until the burner 4 rises to the oil vaporization temperature, that is, the heater 15 is turned on by the signal from the burner thermistor 20.
Control is performed to turn off the switch, and the process proceeds to step S4.
In step S4, a check is made to see if the float switch non-detection timer has timed up. If the time has been up, the process proceeds to step S5; if not, the process returns to step S3. In step S5, the float switch 10 is checked. If it is ON, proceed to step S6, and if it is OFF, proceed to step S6.
Proceed to S14 and stop driving. In step S6,
Check whether preheating is completed by the signal from burner thermistor 20, and if preheating is completed, proceed to step
Proceed to S7. In step S7, the contact 14 is opened, the heater 15 is turned off to complete preheating, the contact 16 is closed, the burner motor 17 and the blower motor 5 are turned on to perform pre-purging, and the process proceeds to step S8. step
At S5, it is confirmed that the pre-purge is completed and the process proceeds to step S9. In step S9, the contact 18 is closed and the electromagnetic pump 11 and igniter 19 are turned on, and step S10
Proceed to. At step S10, the operation switch 21 is turned on again.
It is confirmed whether it is ON or OFF. If it is OFF, it is assumed that the operation has stopped and the process proceeds to step S14. If it is ON, the process proceeds to step S11. In step S11, the float switch 10 is checked, and if it is ON, the process advances to step S13 to continue combustion. In step S12, the oil-out combustion continuation timer, which is part of the combustion control means 26, is initialized, and the process returns to step S10.

If it is OFF, proceed to step S12. step
In S12, the oil-out combustion continuation timer is activated and it is checked whether the time has expired or not. If the time has not expired yet, proceed to step S10.
If the time has expired, the process advances to step S14 and the operation is stopped. In step S14, contacts 14, 16,
18, and turn on the heater 15, burner motor 17, blower motor 5, electromagnetic pump 11, and igniter 19.
Turn OFF, stop operation, and proceed to step S15. In step S15, it is confirmed whether the operation switch 21 is ON or OFF, and if it is ON, it waits in step S15.
If it is OFF, proceed to step S1 and return to the start.

That is, during normal combustion, step S10 → step S11 → step S13 → step S10 is repeated, but when the float switch 10 is activated and the oil level falls below B in Fig. 5, the oil-out combustion continuation timer starts counting. When a certain period of time has elapsed and the oil-out combustion continuation timer times up, the oil level reaches point C and the process advances to step S14 to stop combustion. Next, when the movable tank 9 is refueled and the fixed tank 3 is refilled, the oil level gradually increases from point C.Furthermore, when the operation switch 21 is turned from OFF to ON, this operation command signal is sent to the control circuit. accepts, step S15 → step S1 → step S2 → step
The process advances to S3 and preheating of the burner 4 is started. Step S3 → Step S4 → Step S3 is repeated until the float switch non-detection timer times out. If the oil level in the fixed tank 3 reaches or exceeds point B, and the float switch 10 is ON, step S4 → Step S3 is repeated. S5, that is, step S5 → step S6 → step S7 when time up
→ Step S8 → Step S9 → Step S10, and normal combustion is performed. If the fixed tank 3 is not refilled with oil by the movable tank 9 and the fixed tank 3 is not refueled, the process goes from step S5 to step S14 to step S15 and stops, and the oil level never exceeds point C.

Effects of the Invention As described above, according to the present invention, when restarting operation after running out of oil, you can immediately turn on the operation switch once without waiting for the oil level to rise due to replenishment oil and for the oil level check means to turn on. It is easy to use and allows you to start operation. Even if the operation switch is turned on without refueling, it is safe because the operation of the oil level check means is confirmed before operating the fuel supply means such as the pump when the timer means expires.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of a combustion appliance showing an embodiment of the present invention, and FIG. 2 is a configuration diagram of the main parts of the control circuit.
Fig. 3 is a flowchart of the control circuit, Fig. 4 is a sectional view showing the present invention and a conventional combustion appliance, Fig. 5 is an enlarged sectional view of the tank section, and Fig. 6 is a control of the conventional combustion appliance. It is a circuit diagram. 3... fixed tank, 4... burner, 10... float switch, 11... pump (fuel supply means), 13... control circuit, 23... timer means,
24... Preheating control means, 25... Oil level checking means, 26... Combustion control means.

Claims (1)

[Claims] 1. A tank that stores oil, a fuel supply means such as a pump that supplies oil, a burner that vaporizes and burns the oil supplied by the fuel supply means, and an oil level that detects the height of the oil level in the tank. a sensor, and a control circuit that preheats the burner and controls the pump etc. based on a signal from the oil level sensor, and the control circuit is configured to control when the oil level level in the tank is determined by the oil level sensor. a combustion control means that measures the combustion time after detecting that the oil level is below a predetermined value and stops combustion after continuing combustion for a certain period of time; A timer means that does not allow input and a preheating control means that preheats the burner are operated, and when the timer means times out, it is detected by a signal from an oil level sensor that the oil level height in the tank is higher than a predetermined value. A control device for a combustion appliance consisting of an oil level check means that operates a pump, etc.