JPS62196526A - Safety device for kerosene fan heater - Google Patents

Abstract

PURPOSE:To provide a safety device for a kerosene fan heater capable of preventing a useless consumption of electrical power and improving a safety characteristic by a method wherein a heated gasification unit is sensed by a gasification unit temperature sensor to operate an alarm means even if an operation switch is turned OFF. CONSTITUTION:When a condition in which a contact point 12 and a thyristor 13 are troubled during combustion and the contact point 12 is not turned OFF even if an operation switch is turned OFF and another condition in which the thyristor 13 is kept at its conducted state are generated, an energization of the gasification heater 14 is continued and the gasification unit is kept in its hot temperature condition. When a contact point 44 is turned OFF by turning OFF the operation switch, a microcomputer 23 may operate a timer, check a sensed temperature of the gasification thermistor 42, recognize hot temperature condition of the gasification, set a value of '1' to an abnormal flag and at the same time display an information informing an abnormal condition of the gasification heater to a digital display unit 32 and operate a buzzer 35. When a reset switch 43 is operated, the displayed condition of the display unit 32 is changed to a normal display and an operation of the buzzer 35 is terminated.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) This invention relates to a safety device for a kerosene fan heater using a vaporizer that vaporizes kerosene.

(Prior art) A kerosene fan heater using a vaporizer that vaporizes kerosene starts energizing the vaporizer heater when the operation switch is turned on, and detects the temperature of the vaporizer with a vaporizer thermistor. When the temperature of the tank is raised to a predetermined temperature, an electromagnetic pump is driven to send the kerosene in the tank to the vaporizer and start combustion. When the operation switch is turned OFF, the operation of the electromagnetic pump and the supply of electricity to the vaporizer heater are stopped to extinguish the fire.

Conventionally, for example, the vaporizer heater was connected to a commercial AC power source via a bidirectional three-terminal thyristor and the contact of the operation switch, and the thyristor was triggered by a microcomputer via a gate transformer to turn on electricity to the vaporizer heater. I try to control it.

With something like this, the contact of the operation switch will malfunction and it will turn 0F.
If the FL runs out and the thyristor sometimes has a conduction failure, the problem is that the vaporizer heater continues to be energized even though the operation switch is turned off, and the vaporizer temperature remains high. be.

(Problems to be Solved by the Invention) Conventionally, however, no countermeasures have been taken to address these problems, resulting in the problem of wasted power consumption by the vaporizer heater. Further, at the beginning of ignition, the temperature of the carburetor is not sufficiently high, so combustion becomes unstable. For this reason, a large amount of kerosene is supplied at the beginning of ignition to quickly stabilize combustion, but as mentioned above, if the temperature of the carburetor is high at the time of re-ignition, there is a risk of abnormal heating.
There was a problem with safety.

This invention was made in view of the above points, and it is possible to notify when the temperature of the vaporizer does not decrease even though the operation switch is turned OFF, and thereby to control the vaporizer heater. It is an object of the present invention to provide a safety device for a kerosene fan heater that can take measures to stop energization, prevent wasteful consumption of power, and improve safety.

[Structure of the Invention] (Means for Solving the Problems) As shown in FIG. 1, the present invention provides a kerosene fan heater that performs a combustion operation by vaporizing kerosene in a vaporizer heated by a vaporizer heater. A vaporizer temperature detector 2 that detects the temperature of the vaporizer 1 and a timer 4 that is activated by the OFF operation of the operation switch 3 are provided. When the checking means 5 checks that the detected temperature of the vaporizer 1 is in a high temperature state, a notification means 6 such as a display or a buzzer is operated.

(Function) In the present invention having such a configuration, a failure occurs in which the control unit that controls ON and OFF of energization to the vaporizer heater fails and the vaporizer 1 continues to be heated even if the operation switch 3 is turned OFF. Then, it can be detected by the vaporizer temperature detector 2 and the alarm means 6 can be activated to notify the user.

(Example) As shown in Fig. 2, one contact 12 of a two-contact type operation switch and bidirectionality is provided, which has two mutually interlocking contacts between both terminals of a plug 11 connected to a commercial AC power outlet. A vaporizer heater 14 for heating the vaporizer is connected through a three-terminal thyristor 13 in series. A secondary winding of a gate transformer 16 is connected between the gate and terminals of the thyristor 13 via a diode 15.

Further, between both terminals of the plug 11, the contact 12 and the normally open contact 17m of the relay 17 are connected in series to an ignition transformer 18 and a control circuit 2 for an electromagnetic pump 19 that controls the supply of kerosene.
0 and a convection fan motor 21 for blowing air heated by the combustion operation to the outside.

Furthermore, a power transformer 22 is provided between both terminals of the plug 11.
The primary winding of is connected. In addition, 2 of the power transformer
A stabilizing circuit for creating a DC power supply to a microcomputer 23, which will be described later, is connected to the next winding.

The microcomputer 23 has an output terminal of Do''-Dtt, an output terminal of 5o-87, an output terminal of King, and 70 to Kn~.
Input terminal, Fo to F3 input terminal, other xin, x
Out terminal, INT terminal, etc. are provided, and Xin
An oscillator 24 for generating a reference clock is connected between the terminal and the Xoutl terminal. Further, a shooting circuit 25 is connected to the INT terminal for determining the timing for applying an interrupt.

Furthermore, the input terminals of buffers 26, 27, 28, 29 are connected to the DO-DB output terminals of the microcomputer 23, respectively, and the buffer 30 is connected to the output terminals of DB and D9.
．． 31 input terminals are connected. The two output terminals of the buffer 26 are connected to a 4-digit segment display 32.
are connected to digit control terminals d1 to d4, respectively. Further, the output terminal of the buffer 30 is connected to the relay 1.
The output terminal of the buffer 31 is connected to one end of the primary winding of the gate transformer 16 via a resistor 33. The other end of the relay 17 and the other end of the primary winding of the gate transformer 16 are connected to a DC positive terminal Vp obtained by full-wave rectifying and smoothing the output from the secondary winding of the power transformer 22. .

Further, the Dll output terminal of the microcomputer 23 is connected to one end of a buzzer 35 which is an alarm means through an oscillation circuit 34, and the output terminal of the Dll is connected to one end of a light emitting diode 36 of a photocoupler. The other ends of the buzzer 35 and the light emitting diode 36 are each grounded.

Further, the output terminal 5o=Ss of the microcomputer 23 is connected to each segment control terminal a to q of the display 32, respectively.

Furthermore, a connection point between one end of a thermistor 38 for room temperature detection and one end of a resistor 39 is connected to the input terminal No. 1 of the microcomputer 23 via a resistor 37, and a connection point between one end of a thermistor 38 for room temperature detection and one end of a resistor 39 is connected to the input terminal No. 2 of the microcomputer 23 via a resistor 40. A connection point between one end of the resistor 41 and one end of a vaporizer thermistor 42, which is a vaporizer temperature sensor, is connected. The other end of the room temperature thermistor 38 and the other end of the resistor 41 are grounded via a resistor 42.
9 and the other end of the carburetor thermistor 42 are connected to the Vss terminal obtained from the stabilizing circuit. In addition,
Vp>Vss.

Further, a reset switch 43 is connected to the F2 input terminal of the microcomputer 23, and the other contact 44 of the operation switch is connected to the F3 input terminal.

The phototransistor 45 of the photocoupler is connected to the control circuit, and the rotation of the electromagnetic pump 19 is controlled by the frequency of the pulse signal input from the transistor 45.

The microcomputer 23 performs the processing shown in FIG. 3 when the operation switch is turned on and its contacts 12.44 are turned on. This process first sets the abnormality flag to "1".
If the abnormality flag is not set to "1", normal combustion operation is started. This combustion operation controls the gate transformer 16 to control the conduction of the thyristor 13, and starts energizing the carburetor heater 14. Then, the temperature of the vaporizer is detected by the vaporizer thermistor 42, and when the temperature of the vaporizer rises to a predetermined temperature, the relay 17 is controlled to turn on the normally open contact 17m, and the ignition transformer 18 and the electromagnetic pump 19 operate. Then, the operation of the convection fan motor 21 is started. Then, the thyristor 13 is controlled by the vaporizer temperature from the vaporizer thermistor 42, and electricity is turned on to the vaporizer heater 14.

The OFF control is used to prevent the temperature of the vaporizer from rising above a certain temperature. Note that the time is displayed on the display 32.

In addition, if the abnormality flag is "1", the output from the output terminal of D8 is controlled so that the relay 17 cannot operate, and the segment signal from the "So"Ss output terminal is changed to display the carburetor rEOOIJ on the display 32. Displays information that indicates an abnormality in the heater 14.Furthermore, turns on the buzzer 35.
make it work. If the reset switch 43 is turned on in this state, the display of rEOOlJ on the display 32 is stopped and switched to the time display, and the buzzer 35 is turned off.
let

In addition, the microcomputer 23 has an operation switch set to OFF.
When the FF is operated and each contact 12.44 is turned OFF, the process shown in FIG. 4 is performed. This process begins with relay 17.
The normally open contact 17m is turned off to stop the combustion operation.

Further, the operation of the gate transformer 16 is stopped and the supply of electricity to the vaporizer heater 14 is stopped. Then turn on the timer. After that, when the timer continues to operate for a preset period of time, the timer is turned off and the temperature detected by the vaporizer thermistor 42 is read. If the read sensed temperature has become low, it is determined that the energization to the vaporizer heater 14 has been stopped. Also, if the detected temperature is high, the abnormality flag is set to "1" and the segment signals from the So to S6 output terminals are changed to display information called rEOOIJ on the display 32 indicating an abnormality in the carburetor heater 14. Then turn the buzzer 35 to O.
N Operate. In this state, the reset switch 43
If there is an ON operation, the display 32 stops displaying rEOOlJ, switches to time display, and turns off the buzzer 35.
F.

In this embodiment with such a configuration, when the operation switch is turned ON in a normal state, each of its contacts 12.44 is turned ON, and the microcomputer 23 controls conduction of the thyristor 13 via the gate transformer 16, and turns on the vaporizer heater 14. Start energizing. When the temperature of the vaporizer reaches a predetermined temperature, the relay 17 is activated to start refueling the vaporizer, ignite it, and start operating the convection fan motor 21.

In this way, the combustion operation starts. During this operation, when the temperature of the vaporizer becomes too high, it is detected by the vaporizer thermistor 42 and the conduction control of the thyristor 13 via the gate transformer 16 is stopped.

Further, when the operation switch is turned OFF during the combustion operation, each contact 12.44 is turned OFF, and the microcomputer 23 controls the operation of the relay 17 to stop, thereby stopping the supply of kerosene to the carburetor.

The microcomputer 23 also has a vaporizer thermistor 42.
The operation of the gate transformer 16 is completely stopped regardless of the detected temperature.

The above is operation control under normal conditions, but during combustion, contact 12
If the thyristor 13 fails and the operation switch is turned OFF, the contact 12 remains at 0FFL, and if the thyristor 13 remains conductive, the energization to the carburetor heater 14 continues even after the combustion operation has stopped. The vaporizer will be maintained at a high temperature. However, when the contact 44 is turned off by turning off the operation switch, the microcomputer 23 operates a timer and checks the temperature detected by the vaporizer thermistor 42 after a certain period of time. Through this check, it is learned that the carburetor is in a high temperature state, and the abnormality flag is set to "1", and the digital display 3
2 displays information called rEOOIJ indicating an abnormality in the vaporizer heater, and operates the buzzer 35. Thus, the user knows from the sound of the buzzer 35 and the display on the display 32 that an abnormality has occurred in the carburetor heater 14. In addition, if the reset switch 43 is operated at this time, the display 3
The display 2 changes to a normal time display, and the operation of the buzzer 35 is stopped.

In this way, the user can take measures against abnormalities by, for example, unplugging the plug 11 from the outlet. Therefore, the safety can be improved without being notified while the vaporizer is still at an abnormally high temperature.

Further, wasteful consumption of electric power by the vaporizer heater 14 is also eliminated.

Furthermore, even if another person accidentally turns on the operation switch in a malfunctioning state, the abnormality flag is set to "1" at this time, so the operation of the relay 17 is prohibited and held. The start of the combustion operation is prohibited, rEOOIJ is displayed on the display 32, and the buzzer 3 is activated.
5 operates to notify the user of an abnormality in the vaporizer heater 14.

In this way, after the failure of the vaporizer heater 14 occurs, reburning operation is prevented, so even if the temperature of the vaporizer is high, kerosene will not be supplied to the vaporizer, further increasing safety. You can improve.

-13= In the above embodiments, the energization control to the vaporizer heater was described as using a bidirectional three-terminal thyristor, but the invention is not necessarily limited to this, and it may be performed using a relay or the like. .

[Effects of the Invention] As detailed above, according to the present invention, if the temperature of the vaporizer does not decrease even though the operation switch is turned off, it can be notified, and therefore measures can be taken to prevent this. Therefore, it is possible to provide a safety device for a kerosene fan heater that can prevent wasted power consumption by the vaporizer heater and improve safety.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram for explaining the invention in detail, Fig. 2 is a circuit configuration diagram showing an embodiment of the invention, and Fig. 3 is a functional block diagram for explaining the invention in detail.
3 and 4 show the control processing of the microcomputer in the same embodiment. FIG. 3 is a flowchart showing the processing when the power is turned on, and FIG. 4 is a flowchart showing the processing when the power is turned off. 12.44... Operation switch contact, 13... Bidirectional 3-terminal thyristor, 14... Carburetor heater, 17
... Relay, 19 ... Electromagnetic pump, 21 ... Convection fan motor, 23 ... Microcomputer, 3
2... Segment display, 35... Buzzer, 42...
... Carburetor thermistor (carburetor temperature detector). Applicant's agent Patent attorney Takehiko Suzue; Figure 3 Figure 4

Claims (1)

[Claims] When the operation switch is turned ON, electricity is supplied to the vaporizer heater to heat the vaporizer, and after the vaporizer is sufficiently heated, kerosene is supplied to the vaporizer to start the combustion operation,
In a kerosene fan heater that blows air heated by this combustion operation to the outside using a convection fan, a vaporizer temperature detector that detects the temperature of the vaporizer and an O switch of the operation switch are provided.
a timer operated by the FF operation; a checking means for checking the temperature detected by the vaporizer temperature detector when the timer operation is performed for a preset certain period of time; and an operation when the checking means checks the high temperature detection state. 1. A safety device for a kerosene fan heater, characterized in that it is provided with an alarm means.