JPS611921A - Control device of combustion apparatus - Google Patents

Abstract

PURPOSE:To make it possible for the control system to perform the following operation with a margin in a fuel storage quantity by constituting the control system so that alarms are emitted at a time when a float switch before the combustion stops has detected a predetermined oil surface and at a predetermined time after the float switch operates. CONSTITUTION:The control system comprises a control circuit 15 mainly consisting of a microcomputer 14 operating by a signal emitted from a float switch 10 and a circuit letting know by a buzzer or the like when operating by the signal. After a float 25 emits an OFF signal, a supply oil lamp 22a is lit. Upon this occasion, a buzzer 24 only operates for a predetermined time simultaneously, and the combustion is stopped automatically after 1hr later. In this case, it is indicated that at a time 10min before the combustion stop, even the buzzer 24 operates again, it is immediately cut off. Simultaneously with the operation of the buzzer 24, the supply lamp 22a is changed from lighting to flickering simultaneously with the operation of the buzzer 24.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a combustion appliance such as a kerosene fan heater.

Structure of the conventional example and its problems A conventional combustion appliance, for example an oil 7 unheater, is surrounded by an outer device and a bottom plate 2 as shown in FIG. 3, and has a fixed oil tank 3.
, a burner unit 4 is provided.

The combustion gas A burnt by the burner motor 1-4 is blown out as warm air C from the looper 7 along with the indoor air B by the fan 6 collected by the blower motor 5, and is used for indoor heating. Fig. 4 is attached to the fixed tank 3 shown in Fig. 3, in which a movable tank 9 is placed above the oil filler port 8 of the fixed tank 3, and a float switch 1 for detecting the oil level.
0, a pump 11 for supplying oil to the burner unit 4 is also attached. FIG. 5 shows an example of a conventional control circuit, in which a power switch 13 is connected to the AC power source, and a control circuit 15 mainly composed of a microcomputer (hereinafter referred to as microcomputer) 14 and a contact 16 are connected between both ends a and b of the power switch 13. A series circuit with the sheathed heater 17 for vaporizing kerosene in the burner unit 4, and a series-parallel circuit with the contact 1B, the blower motor 5, and the burner motor 19 for supplying combustion air into the burner unit 4. , the contacts 20 are connected to the pump 11 and the burner unit 3 . In addition to sensors such as the float switch 10, the control circuit 15 is also connected to a display panel 23 such as a light emitting diode 22 and a buzzer 24 that display the operating status and masterpiece status of the circuit.

In such a configuration, by closing the operation switch 13'f, the control circuit 15 activates each contact 16, 18, 20 with the help of the microcomputer 14 to turn on the burner unit 4.
Kerosene is combusted inside, generating combustion gas A as shown in Fig. 3. In Figure 4, while oil remains in the movable tank 9, the oil level maintains the height A, but as the curved surface in the fixed tank 3 gradually decreases, the float switch 10 When the float 25 goes down to the OFF point B, the signal enters the microcomputer 14, and the refueling lamp 22a in the display panel 23 lights up.Since the light alone may not be enough to alert you, the buzzer ~24 will sound. It has become. When this reservoir is in use, a sound and a light are used to notify that the amount of oil in the fixed tank 3 is only a certain amount, for example, enough for about one hour. At this point, the user should consider whether to set a timer or use it a little longer before stopping. Note that the time it takes for combustion to stop after the alarm is issued by the refueling lamp 22a is particularly long, for example about one hour, and if the lamp 22a alone is used, it is easy to forget that one hour has passed and combustion has stopped. There are times when it gets shorter. Even in this case, the microcomputer 14 turns off the float 25.
The combustion is stopped after the signal is issued when the oil level is at C in FIG. 4, which is higher than the oil suction height D of the pump 11 [1]. This is to prevent combustion from becoming unstable when the pump 11 runs out of oil and sucks in a mixture of oil and air, and from unburned kerosene getting mixed into the combustion gas indoors and causing a foul odor. . A similar situation tends to occur even when a fan heater or the like is stopped, so we try to avoid stopping combustion as much as possible.

In this way, conventionally, after a certain period of time (e.g. about 1 hour) after the refueling lamp lights up and the buzzer sounds, it is easy to forget something that happened or how long it took. They have drawbacks such as the fire extinguishing automatically after one burn, or the fire burning for only a short time even after setting the timer without knowing whether it is okay to set the next timer. Ta.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems.
The purpose of this is to issue a warning etc. so that the next operation can be carried out with sufficient fuel storage capacity.

Structure of the Invention In order to achieve the object described in item 1, the present invention is designed to issue an alarm, etc. when the float switch detects a constant oil level before combustion stops, and again after a certain period of time after the float switch operates at this time. This is the configuration.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Since the combustion appliance employing the combustion control device of the present invention is the same as that shown in FIGS. 3 and 4, the detailed description thereof will be omitted by referring to FIGS. 3 and 4. The circuit of the combustion device is still as shown in FIG. 1, and the same parts as in the conventional example shown in FIG.

FIG. 2 explains the operation of the lamp and buzzer when the microcomputer 14 stops combustion after the float 25 issues an OFF signal.

Figure 2a shows a conventional operation in which the float 25 issues an OFF signal, the refueling lamp 22a lights up, and at the same time, the buzzer 24 goes off for a certain period of time (for example, 10 seconds (ON,
5 seconds, OF FO, repeat for 5 seconds)) The combustion will automatically stop after 1 hour. This resulted in disadvantages such as an odor generated by extinguishing the fire, and combustion stopping immediately even when a timer was set to start the next morning. On the other hand, FIG. 2 is an operation diagram of one embodiment of the present invention, and when the float 25 issues an OFF signal, the operations of the refueling lamp 22a and the buzzer 24 are exactly the same as in the conventional case (see FIG. 2). 10 minutes before combustion stops, the buzzer 24 starts operating again for 10 seconds (0.5 seconds ON, 0.5 seconds OFF repeatedly). It is now indicating that it is about to expire. In C of the same figure, the refueling lamp 22a is connected to the buzzer 24.
At the same time as the operation, the light will change from lighting up to flashing. The tone of the buzzer was changed from the first time for 10 seconds (0,
It is also possible to do this by programming the microcomputer 14a.

After such a second alarm such as a buzzer, the movable tank 9 is quickly removed, refueled, and then set on the fan heater again to ensure the oil level A, so the float 25 rises. The microcomputer 14 then turns off the refueling lamp 22a and continues combustion by closing the contact 25a. The other operations of this circuit are the same as those of the conventional example, so a description thereof will be omitted.

Effects of the Invention As is clear from the above embodiments, the present invention is effective when the refueling warning time is extended, and the warning is issued again between the time the refueling warning is issued and the combustion stops (1). All you need to do is refuel based on the purpose of use, and you can still set the timer without any mistakes.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram in an embodiment of the control device of the present invention;
FIG. 2 is an explanatory diagram of its operation, FIG. 3 is a cross-sectional view of the combustion appliance of the conventional example and the present invention, FIG. 4 is a cross-sectional view of the tank portion, and FIG. 5 is a control circuit diagram. 3. Fixed tank, 4 Burner (burner unit), 9.
Movable tank, 10. Float switch, 14. Microcomputer, 15. Control circuit, 22a. Refueling lamp, 24. Buzzer. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure Figure 3! r

Claims (1)

[Claims] A tank for storing oil, a burner for supplying and burning oil, a float switch provided in the tank to detect the oil level, a control circuit mainly based on a microcomputer that operates according to the signal of the float switch, and the signal When the float switch detects a certain level of oil in the tank, and a certain period of time after this time, the burner stops burning. A control device for combustion appliances that uses a buzzer etc. to notify you again before the operation is completed.