JPH02223704A - Offensive odor absorption control of wick type kerosene burner - Google Patents

Abstract

PURPOSE:To make the device inexpensive by operating a switch provided at the position of fire extinguishing by means of fire extinguishing operation and recovering the switch by the descending of a wick to obtain fire extinguishing signal in pulses and at the same time operating a timer circuit by the fire extinguishing signal to drive a fan motor. CONSTITUTION:In the circuit of an offensive odor absorption device a heater 28, ignition switch 29, and switch 31 which turns ON and OFF by fire extinguishing operation are provided. Numerals 34a-34d are C-MOS NAND gate circuits of the type to consume a low electric current. An edge detection circuit A consists of the circuits 34a and 34b, a resistance and condensers 32-37 and it detects the rise signal of the switch 31. A timer circuit B is constituted of a resistance, condensers 41, 47 and circuits 34c and 34d. The switch 31 is turned ON by the fire extinguishing operation and it is turned OFF when the wick is lowered. With this operation the time (t) of operation of a motor 46 is determined by the discharge time constant of the condenser 42 and resistance 47. With this arrangement, an inexpensive tact switch is provided with use that is the same as that for tact switches used in general.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an odor absorption control device for a wick-type oil combustor.

Conventional technology Generally speaking, wick-type oil combustors have the problem that when the wick is lowered to extinguish the fire, the oil vapor that continues to evaporate from the wick enters the high-temperature combustion cylinder, where it is thermally decomposed and produces a strong odor. Ta.

Recently, in order to reduce the odor caused by extinguishing a lamp, a method has been proposed in which an odor absorbing device such as a fan is operated at the same time as the lamp extinguishes the lamp, and the petroleum vapor that continues to vaporize from the wick is sucked into the tank and then released to the outside. Figures 3 and 4 show a wick-type oil combustor with such a device. When the wick 1 is lowered to extinguish the fire, the fan 3 of the odor absorbing device 2 starts rotating, and the oil vapor that continues to vaporize from the top of the wick 1 is removed. It is sucked into the tank 4 as shown by the arrow and discharged to the outside through the discharge port 5.

According to this wick-type oil combustor equipped with an odor absorbing device, the oil vapor that continues to be generated after extinguishing the fire does not flow into the high-temperature combustion tube 6, but is released into the atmosphere through the tank 4, so that the oil vapor absorbs heat. The irritating odor caused by decomposition is eliminated, resulting in a significant odor reduction.

A control device for such an odor absorbing device for a wick-type oil combustor has conventionally been constructed as shown in FIG. The configuration will be described below along with an explanation of its operation. First, when the lamp wick upper and lower knobs 7 are operated to raise the lamp wick l and ignite it with the igniter, the common contact 8a of the switch 8 interlocked with the lamp wick upper and lower knobs 7 is not switched to the normally open contact 8b side. This causes switch 8. resistance 12
The capacitor 26 is charged via the capacitor 26.

Next, from this state, when the lamp wick upper and lower knobs 7 are operated to lower the lamp and extinguish the light, the common contact 8a of the switch 8 is switched to the normally closed contact 8c side.

This causes capacitor 26 to connect to transistor 13. Resistance9. Discharge via switch 8. This discharge current turns the transistor 13 ON, and the transistor 23 turns ON via the resistor 21. As a result, the motor 24 operates, the fan 3 starts rotating, and the petroleum vapor that continues to vaporize from the top of the wick is sucked into the tank 4 as described above. Also, when the transistor 13 is turned on, the resistor 17.16
A base current is supplied to the transistor 14 through the transistor 14, and the transistor 14 is turned on. As a result, even if the discharge current of the capacitor 26 disappears in the transistor 13, the base current continues to flow through the transistor 14. In other words, a self-holding circuit is formed. At the same time, charging of the capacitor 19 is started via the resistor 18, and when the charging voltage reaches the emitter potential of the transistor 20 or higher, the transistor 20 is turned on. As a result, the transistor 14 is turned OFF, and the transistor 13 is turned off. As a result, the power supply to the transistor 23 is also stopped, so that the transistor 23 is turned off, the operation of the motor 24 is stopped, and the rotation of the fan 3 is stopped. That is, the motor 24 rotates and performs the odor absorbing operation while the capacitor 19 is charged to a certain voltage, and then automatically stops.

Problem to be Solved by the Invention However, for the purpose of suppressing the circuit current during combustion, the conventional control circuit uses a changeover type switch 8 having a normally open contact 8b and a normally closed contact 8c. This required a complicated circuit configuration, including a charging circuit for the capacitor 26 for starting the fire, and a discharging circuit for the capacitor 26 for extinguishing the fire. For this reason, as mentioned above, a change-over type switch must be used, which poses a problem of high cost.

The present invention was made in view of these points, and aims to reduce costs by configuring a circuit using simple switches such as tact switches.

Means for Solving the Problems In order to achieve the above object, the present invention disposes a switch for obtaining an extinguishing signal in the extinguishing position, operates in the extinguishing position by extinguishing operation, and returns to its original state when the wick is lowered. In other words, it is configured to operate in a pulsed manner. The switch configured in this way and the ignition switch activated by the ignition operation are connected to the input terminal of an edge detection circuit composed of a gate circuit of a low current consumption type C-MOS IC, so that even if the extinguishing signal is fixed, It is configured to obtain a predetermined pulse signal and to control the CR charge/discharge circuit of the timer circuit in the subsequent stage via a transistor connected to the output of the edge detection circuit.

Function The present invention has the above-mentioned configuration. First, the extinguishing signal of the switch activated when igniting is deleted by the ON signal of the ignition switch to stop the operation of the timer circuit, and the timer circuit is activated by the extinguishing signal when extinguishing the fire to a predetermined time. Drive the time motor.

In addition, even when the wick is fixed at the extinguishing position, that is, even when the extinguishing signal is fixed, the edge detection circuit obtains a predetermined pulse signal, so there is no problem such as the timer circuit becoming ONL or without a brim. Since the movement of the switch for obtaining the extinguishing signal is made in a pulsed manner, it can be used in the same way as a general tact switch, and an inexpensive tact switch can be used, making it possible to reduce costs.

EXAMPLE Hereinafter, an example will be explained using the accompanying drawings. In the figure, 27 is a battery, 28 is an ignition heater, 29 is an ignition switch, and 30 is a diode that stops the operation of the subsequent circuit during ignition. It is for.

31 is a switch which performs ON-OFF operation by extinguishing the fire; 32 and 33 are limiting resistors; and 34a to 34d are low current consumption type C-MOS NAND gate circuits. 35 is a resistor, 36 is a capacitor, and 37 to 39 are resistors. These 32 to 37 constitute an edge detection circuit A, which is a circuit for detecting the rising signal of the switch 31. Although this embodiment uses a configuration that detects rising signals, it is also possible to use a circuit that detects falling signals.

40 is a transistor that performs switching control of the CR charging/discharging circuit in the subsequent stage, 41 is a resistor, 42 is a capacitor, 43.4
4 is a resistor, 45 is a transistor, 46 is a motor, and 47 is a resistor. 41, 42, 47 degrees 34c and 34d constitute a timer circuit B using the threshold value of the gate circuit.

Next, the operation of the above configuration will be explained with reference to FIG.

First, in the extinguishing state, the switch 31 is in the OFF state and the motor is in the stopped state. When the 0 ignition operation is performed,
The wick rises from its lowest point to the ignition position. In this process, the switch 31 performs an ON-OFF operation in order to pass through the extinguishing position, but since the ignition switch 29 is also turned ON at the same time, the input point a of the edge detection circuit A is switched to L by the diode 30.
It is clamped to the ow potential, the output point d of the edge detection circuit A remains at the low potential, and the motor 46 is in a stopped state.

When the ignition operation is completed, the ignition switch 29 is set to 0FFL, but the switch 31 is turned off, so the edge detection circuit A
The output point d maintains a Low potential.

Next, when the wick is lowered by an extinguishing operation, the switch 31 is turned on at the extinguishing position, and the potential at point a becomes Hi level. When the wick is lowered further, the switch 31 turns OFF, and a
The point potential becomes Low level.

When the potential at point a becomes Hi, the potential at point b becomes Low.
Therefore, the capacitor 36 starts discharging via the resistor 35, and the potential at point a decreases with a predetermined time constant.

Only when the potentials at point a and point 0 are above the threshold of gate circuit 34b, the output of gate circuit 34b, the potential at point d, is Low.
level. When point d goes low, transistor 40
begins charging the capacitor 42 via the ONL resistor 41. The constant of the resistor 41 is set so that charging of the capacitor 42 is completed while this point d remains at a low level. Charging of the capacitor 42 progresses and the gate circuit 34c
When the threshold value is exceeded, the output of the gate circuit 34c becomes Lo.
The output potential at point r of outputs w and 34d becomes Hi, and the transistor 45 is turned on via the resistor 43. This causes the motor 46 to start operating. Next, when the output potential at point d of the gate circuit 34b becomes Hi level, the transistor 40 becomes O
The FF becomes FF, and the charge in the capacitor 42 starts discharging via the resistor 47. When the potential of the capacitor 42 becomes lower than the threshold value of the gate circuit 34c, the output is inverted, the potential at point r becomes Low, and the transistor 45 is turned off.

The motor will stop. In this way, the transistor 40 is turned off.
F and then capacitor 42. The operating time of the motor is set by the discharge time constant of the resistor 47.

In addition, even if the switch 31 is stopped at the ON position during extinguishing operation, the output d of the edge detection circuit A
The point is that since a pulse signal with a width determined by the time constant of the resistor 35 and the capacitor 36 is generated, there is no problem such as the motor turning ON.

Effects of the Invention As is clear from the description of the embodiments, the present invention is economical because a pulse signal can be used as the extinguishing signal, and a simple circuit configuration using an inexpensive tact switch is sufficient.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an odor absorption control device in an embodiment of the present invention, Fig. 2 is a voltage waveform diagram of each part of the circuit in an embodiment of the present invention, and Fig. 3 is a combustion diagram using the odor absorption control device of the present invention and a conventional odor absorption control device. A top view of the device, FIG. 4 is a sectional view, and FIG. 5 is a circuit diagram of a conventional odor absorption control device. 27...Battery, 29...Ignition switch, 31...Switch, 34a to 34b-...
-...NAND gate circuit, 40°45...Transistor, 41.47...Resistor, 42...
...Capacitor, 46...Motor, A...
...Edge detection circuit, B...Timer circuit. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] In the motor drive circuit that uses a battery as a power source to turn the odor absorbing fan for a certain period of time after extinguishing the fire, there is a fire extinguishing switch that is installed to operate in pulses when the upper and lower wick extinguishing knobs are operated, and an ignition switch that operates in conjunction with the ignition device. CR charging/discharging is connected to the input side of an edge detection circuit consisting of a circuit to obtain a pulse-like extinguishing signal, and starts charging when the transistor connected to the output of the edge detection circuit is turned on, and starts discharging when it is turned off. An odor absorption control device for a wick-type oil combustor, in which a timer circuit is configured by a circuit and a gate circuit, and the motor of the odor absorption fan is connected via a transistor connected to the output side of the timer circuit.