JPH0217767B2 - - Google Patents

Description

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

Conventional technology In general, wick-type oil combustors have a problem in 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 generates 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 activated at the same time the lamp is extinguished, and the petroleum vapor that continues to evaporate from the wick is sucked into the tank and then released to the outside. Figures 2 and 3 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 is heated to the combustion tube 6.
Since the petroleum vapor is released into the atmosphere through the tank 4 without flowing into the tank 4, the irritating odor caused by thermal decomposition of petroleum vapor is eliminated, and the odor can be significantly reduced.

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, rotate the wick top and bottom knobs 7 to raise the wick 1 and ignite it with an ignition device (not shown).
The common contact 8a of the switch 8, which is interlocked with the switch 8, is switched to the normally open contact 8b side. As a result, switch 8,
The capacitor 10 is charged via the resistor 9, and the transistors 11 and 12
These transistors 11 and 12
Turn on.

Next, from this state, when the lamp wick upper and lower knobs 7 are rotated to lower the lamp wick 1 and extinguish the fire, the common contact 8a of the switch 8 is switched to the normally closed contact 8c side. As a result, electricity flows to the base of transistor 15 via transistor 12, switch 8, and resistors 13 and 14, and this transistor 15
Turn on. As a result, the motor 16 of the fan 3 starts rotating, and as described above, the petroleum vapor that continues to vaporize from the top of the wick is sucked into the tank. On the other hand, at the same time, charging of the capacitor 19 is started via the resistors 17 and 18, and when the charging voltage reaches a certain value, the comparators 20 and 21 are activated to turn off the transistor 11. As a result, the transistor 12 is also turned off, and furthermore, the transistor 15, which was supplied with power via the transistor 12 and the switch 8, is also turned off, and the motor 16 of the fan 3 stops rotating. That is, the motor 16 rotates and performs the odor absorbing operation until the capacitor 19 is charged to a certain voltage, and then automatically stops.

Problems to be Solved by the Invention However, in the conventional control circuit described above, when the combustor is burning, a weak current flows from the battery 22 serving as the power source to the transistors 11 and 12 as described above. For example, when we actually measured this conventional circuit, the voltage of the battery 22 was 3.2V and the current was approximately 0.83mA. As described above, this control circuit has a problem in that a weak current continues to flow while the combustor is burning, which wastes the battery 22. For example, when lighting a lamp wick, assuming that the battery voltage is 3V, the current flowing through the ignition heater is 1A, and the time required for ignition is 5 seconds, the total power required for ignition is 3 x 1 x 5 = 15 w.sec. With this calculation, it is 0.83m as in the conventional example.
If it is used for 10 hours while flowing A, battery voltage 3V Flowing current 0.83mA = 0.83 × 10 ^-3 A Consumption time 10 hours = 10 × 60 × 60 seconds = 36 × 10 ³ Power consumption = 3 × 083 ×10 ⁻³ ×36×10 ³ =89.64w.sec That is, it is about 6 times the ignition power mentioned above, and therefore, the same power was consumed as if the ignition operation was performed seven times in addition to normal ignition. As a result, there was a problem in that the life of the battery was significantly shortened.

The present invention was made in view of these points.
The purpose is to eliminate wasteful consumption of power sources such as batteries and improve battery life.

Means for Solving the Problems In order to achieve the above object, the present invention forms a closed circuit with a power source, a motor of an odor absorbing fan, and a first transistor, and connects a second transistor to the positive side of the power source. A timer circuit formed by a Schmitt circuit consisting of a third and a fourth transistor is connected to the collector of the transistor, and the collector of the transistor on the output side is connected to the base of the second transistor via a resistor. In parallel, the first
Connect a resistor circuit to the base of the transistor, connect a capacitor from the positive side of the power supply,
Connect the common contact of the changeover switch to this capacitor.
The normally closed contact is connected to the base of the first transistor through a resistor, and the normally open contact is connected to the output emitter of the timer circuit.

Function Since the present invention is constructed as described above, during combustion, the changeover switch is switched to the emitter side of the timer circuit and the capacitor is charged, but since the capacitor capacity is not very large, the charging current is also quite large. Charging is completed almost instantly. Therefore, not only can the life of the power supply be extended, but also the operating time can be accurate since the timer circuit is a Schmitt circuit.

Embodiment Below, one embodiment of the embodiment will be explained using FIG.
The points form a closed circuit. Also, the second point from point a
A transistor 24 of
7, 28, 29, 30, 31, and a timer circuit 33 using a Schmitt circuit consisting of a capacitor 32.
is connected. The collector of the output side transistor 25 of the timer circuit is connected to the base of the transistor 24 at point d via a resistor 34. On the other hand, a
The capacitor 36 connected to the point is the changeover switch 35
Common contact 35a, normally closed contact 35c, resistance 3
7 is attached to point d, and the normally open contact 35b of the changeover switch 35 is connected to the emitter of the transistor 25 in the timer circuit 33. Also,
A resistor 39, a resistor 40, and a resistor 39 are connected between points b and c, and point f is connected to the base of the transistor 23a.

In the above configuration, when this control circuit is used in a wick type oil combustor as explained in FIGS. 2 and 3, and the wick 1 is raised to start combustion, the common contact 35a of the changeover switch 35 changes to the normally open contact 35b. When switching to the side, the charging current of the capacitor 36 instantly raises the emitter point e of the transistor 25.
As a result, even if the timer is not completed, the transistor 25 is turned OFF, so that the transistor 24 is also turned OFF, and the timer is instantaneously stopped to stop the motor 23. In this case, the power consumption is only for charging the capacitor 36, and almost no power is consumed.

When the lamp wick 1 is lowered to extinguish the fire in this state, the common contact 35a of the changeover switch 35 returns to the normally closed contact 35c side, and the electrical charge of the capacitor 36 that was charged during combustion is transferred to the base and emitter of the transistor 24. is discharged through the resistor 38, so the transistor 24 is turned on, and the timer circuit 3 is turned on.
3 and motor 23 are turned on. At this time, since there is no charge in the capacitor 32, the transistor 26
OFF, transistor 25 is ON, so the resistor 34 pulls the base of transistor 24 to form a self-holding circuit. After a while, the voltage of the capacitor 32 increases and the transistor 26
When turned ON, the transistor 25 is turned OFF. Therefore, the transistor 24 is turned off. In this state, all transistors are turned off, and the changeover switch 35 also connects the capacitor 36 to the resistor 38, so there is no charging or discharging, and no power is consumed.

Additionally, the motor 23 generally has a transistor 24
Even if it becomes ON, the voltage waveform and current waveform do not match due to its inductance, so it may not operate for a short time. For example, the first
The motor 23 is directly connected in parallel to the resistor 31 and capacitor 32 between points b and c in the figure, and the transistor 24
If the motor 23 is directly connected to the collector of
When the capacitor 36 changes from a charging state to a discharging state, a current of discharge flows from the emitter of the transistor 24 to the base to the point d to the closed loop of the resistor 37, and after a certain period of time, the transistor 24 is self-held. Therefore, transistor 24 must become self-sustaining while capacitor 36 is charged.

However, the voltage V at point b is
The voltage at which the collector of No. 4 (point b) is turned on (power supply 22
The current I is much larger than the current flowing through the timer circuit 33, so the collector current of the transistor 24 can be said to be the motor current itself. . Therefore, the rush current rises with a considerable delay due to the inductance component of the coil of the motor 23. That is, since the current flowing through the collector (point b) of the transistor 24 is small, the base current of the transistor 25 is insufficient, and a self-holding circuit is not formed.

Therefore, it is necessary to continue discharging the capacitor 36 until this current value increases sufficiently. For this purpose, unless the capacitance of the capacitor 36 is large to some extent, there will be insufficient charge. However, in the present invention, since the load on the collector (point b) of the transistor 24 is entirely resistive, there is no difference in the voltage and current waveforms, so the waveforms of the voltage V and current I are exactly the same, and there is no delay. Since the self-holding of the transistor 24 is eliminated, the self-holding of the transistor 24 is performed quickly, and the operation of the timer circuit 33 is also faster.As a result, the capacitance of the capacitor 36 does not have to be large, which reduces costs, and since the timer is formed by a Schmitt circuit, it is reliable. You can get the action.

Effects of the Invention As is clear from the above description of the embodiments, the present invention prevents wasted power loss during combustion of the appliance, thereby extending the life of a power source such as a battery, which is economical. Moreover, the circuit also has the effect of reliably operating as a timer.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an odor absorption control device according to an embodiment of the present invention, FIG. 2 is a top view of a combustion appliance using the present invention and a conventional odor absorption control device, FIG. 3 is a cross-sectional view, and FIG. FIG. 2 is a circuit diagram of a conventional odor absorption control device. 22a...power supply, 23a, 24...transistor, 23...motor, 33...timer circuit, 3
5... Selector switch, 35a... Common contact, 3
5b... Normally open contact, 35c... Normally closed contact, 36...
...capacitor.

Claims (1)

[Claims] 1. Power source such as batteries, motor for odor absorption fan, and
In addition to forming a closed circuit with the transistor of
A timer circuit formed by a Schmitt circuit consisting of two transistors, a third and a fourth, is connected to the collector of the second transistor connected to the power supply, and a timer circuit is connected to the collector of the second transistor connected to the power source.
The collector of the output side transistor of the timer circuit and the base of the second transistor are connected via a resistor, and the power supply and the capacitor are connected to the input resistance circuit of the second transistor. The common contacts are connected in series, the normally closed contact of the changeover switch is passed through a resistor to the base of the second transistor, and the normally open contacts are connected to the emitters of the transistors on the output side. Device.