JPH056084B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oil combustor odor reduction device for reducing odor caused by gas generated from a combustion section during extinguishing operation of an oil combustor.

[Problem of invention]

A typical example of an oil burner is a kerosene stove with a top and bottom wick. When the wick is lowered during the fire extinguishing operation, incomplete combustion gas is generated due to low flame combustion for several seconds to several tens of seconds, and even after the low flame combustion is extinguished, unburned gas is generated until the wick is cooled. These gases still evaporate and decompose as they pass through the high-temperature combustion tube, causing foul odors.

Therefore, as a method of reducing this bad odor, it is possible to exhaust the gas generated during the fire extinguishing operation without passing it through the combustion tube. Specifically, a configuration as shown in FIG. 1 is considered.

That is, in FIG. 1, when extinguishing a fire, the core outer cylinder 1
The inner diameter of the core outer cylinder 1 is expanded slightly below the position of the upper end of the core 3 when the core 3 is inserted into the core guide path 4 between the core inner cylinder 2 and the core inner cylinder 2, and communicates with the internal space 7 of the fuel tank 5. An exhaust passage 10 is formed. moreover,
An exhaust pipe 8 is disposed on the upper wall of the fuel tank 5, and an exhaust pump 9, which is an example of an exhaust means, is provided on the exhaust pipe 8, so that the air in the internal space 7 of the fuel tank 5 is exhausted during extinguishing operation. do. In this way, as shown by the arrow in FIG. 1, the gas generated during the fire extinguishing operation is exhausted and does not pass through the combustion tube 6, making it possible to prevent bad odors.

Since the exhaust pump 9 only needs to be operated for a certain period of time during the fire extinguishing operation, a timer circuit as shown in FIG. 4, for example, can be used.

That is, in FIG. 4, the changeover switch 25
is on when wick 3 is raised during combustion (dotted line position), and when lowered when extinguishing
This micro switch is turned on between b and c (solid line position), and as shown in FIG. 3, it is provided in a part of the lead up and down mechanism 30 and is automatically switched in conjunction with the up and down movement of the lead 3.

During combustion, the transistor is not turned on during bc.
No base current flows through T _r3 and it is off, so the exhaust pump 9 is not operated. Also, since it is on during AC, capacitor _C1 is charged, and the transistor
T _r1 and T _r2 are on because base current flows through them.

The changeover switch 25 is switched by the fire extinguishing operation.
When turned on during bc, transistors T _r1 and T _r2 self-hold on, so transistors T _r1 and T r2
A base current begins to flow between bc and transistor T _r3 is turned on, and as a result, the exhaust pump 9 is activated.

However, since the capacitor C ₂ is charged through the resistors R ₇ and R ₈ , the potential between the resistors R 7 _and R ₈ , that is, the negative input potential of the comparator IC ₁ , changes after a certain period of time to the potential between the resistors R ₅ and R ₆ , that is, the comparator IC. becomes higher than the positive input potential of comparator IC ₁ , and the output of comparator IC ₁ is inverted from high level to low level (corresponding to voltage detection means). Then, since the base current stops flowing, the transistor T _r2 is turned off, and therefore the transistor T _r1 is also turned off. When the transistor T _r1 is turned off, the base current stops flowing and the transistor T _r3 is also turned off, and as a result, the exhaust pump 9 stops. Thereafter, the capacitor C ₂ is instantly discharged by switching the output of the comparator IC ₂ to a low level and returns to the state before power supply started (corresponding to capacitor forced discharge means).

In this way, the exhaust pump 9 is operated for a certain period of time during the fire extinguishing operation.

However, in the case of the timer circuit shown in FIG. 4, the transistors T _r1 and T _r2 are continuously turned on during combustion, and power is supplied to the comparators IC ₁ and IC ₂ , so power consumption is large. If the battery 24 is used as a power source, there are problems such as a shortened lifespan.

The present invention has been made in view of the above circumstances, and an object of the present invention is to significantly reduce power consumption.

[Structure of the invention]

In order to achieve the above object, the present invention includes a changeover switch that operates in conjunction with the extinguishing operation of an oil combustor, and a switch that is started by the operation of the changeover switch and exhausts gas generated from the combustion section without passing through the combustion tube. a capacitor to which power supply is started when the changeover switch is actuated, and a voltage detection means to detect when the charging voltage of the capacitor has reached a predetermined voltage or higher, and in response to a signal from the voltage detection means. and a timer circuit for stopping the exhaust operation of the exhaust means, wherein the capacitor is forced to be discharged by bringing the capacitor into a substantially short-circuit state in response to the operation of the timer circuit. a capacitor forced discharge means that returns the capacitor to the state before the start of power supply; and a power supply that cuts off the power supply to the capacitor forced discharge means and the timer circuit, which are started when the changeover switch is activated, and the timer circuit, in conjunction with the operation of the timer circuit. The present invention is configured as an odor reduction device for an oil combustor, which is characterized by being provided with a shutoff means.

[Effect]

In this oil combustor odor reduction device, a timer circuit detects when the charging voltage of the capacitor, which starts supplying power in conjunction with the oil combustor's extinguishing operation (operation of the selector switch), has exceeded a predetermined voltage. The evacuation operation of the evacuation means is stopped, and the capacitor is brought into a substantially short-circuited state by the capacitor forced discharge means, and is instantly discharged, returning to the state before the start of power supply.

The charging and discharging of the capacitor is strictly controlled by a dedicated timer circuit and capacitor forced discharge means, as described above.

Therefore, with this odor reduction device, the exhaust operation time of the exhaust means can be set accurately.

In addition, as mentioned above, the charging time of the capacitor to set the exhaust operation time of the exhaust means is:
The capacitor is actively (instantaneously) forcibly discharged by the capacitor forced discharge means when the exhaust operation of the exhaust means stops.
Even if the off frequency (i.e., the frequency of ignition and extinguishing of the appliance) is high, it remains almost constant.

Therefore, even in such a case, the exhaust operation of the exhaust means is sufficiently performed, and odor generation is prevented.

Furthermore, in this odor reduction device, the power supply cutoff means allows the power supply to the capacitor forced discharge means and the timer circuit, which are started in conjunction with the fire extinguishing operation (operation of the changeover switch), to be started in conjunction with the operation of the timer circuit. Interlocked and blocked.

Therefore, in this odor reduction device, power consumption is zero except when the exhaust means is operating, and wasteful power consumption during combustion of the appliance can be eliminated.

〔Example〕

Hereinafter, the present invention will be further explained in detail based on embodiments shown in the drawings. Here, FIG. 1 is a sectional view of essential parts of a kerosene stove including an embodiment of the odor reduction device of the present invention, and FIG. 2 is a timer circuit and a timer reset circuit for controlling the exhaust pump of the odor reduction device shown in FIG. 1. Fig. 3 is an external view of the main parts showing the wick up/down mechanism and the changeover switch attached thereto, where a shows the state during combustion and b shows the state when extinguishing. Note that the present invention is not limited thereby.

First, the configuration shown in FIG. 1 is as described above, and the gas generated in the wick 3 during extinguishing operation is transferred to the exhaust passage 10 and the internal space 7 of the fuel tank 5.
The exhaust gas is then exhausted through the exhaust pipe 8 without passing through the combustion tube 6 by an exhaust pump 9, which is an example of an exhaust means.

In addition, a comparator is provided to detect when the charging voltage of the capacitor C ₂ exceeds a predetermined voltage and operate the exhaust pump 9 for a certain period of time during extinguishing operation.
The control circuit 30 is as shown in FIG. 2, including a timer circuit 31 including an IC _1, etc., and a timer reset circuit 32, including a transistor _Tr4, etc., which thereafter cuts off power supply to the timer circuit 31, as will be described later. In this figure, the same components as those previously described with reference to FIG. 4 are given the same reference numerals.

First, during combustion, the changeover switch 25
It is on during and off during bc. Therefore, transistor T _r2 , which is supplied with base current through the b contact, is off, and therefore, no base current flows to either transistor _r1 or _r4 , and these transistors
T _r1 and T _r4 are also off. Further, the transistor T _r3 is also off because no base current is supplied through the b contact, and therefore the exhaust pump 9 is also in a stopped state. On the other hand, charging current flows through the capacitor _C1 through the AC contact, but once it is charged, no current substantially flows. Therefore, during combustion, the battery 24 consumes virtually no power.

When the wick 3 is lowered by a fire extinguishing operation or by a seismic fire extinguishing operation, the changeover switch 25 is automatically switched to turn on during bc and off during ac. Then,
Capacitor C ₁ serves as a power source and supplies base current to transistor T _r2 through resistors R ₄ and R ₂ . Therefore, the transistor T _r2 is turned on, and as a result, base current flows through the transistors T _r1 and T _r4 , and these transistors T _r1 and T _r4 are turned on. When the transistor T _r1 is turned on, a base current is supplied to the transistor T _r2 and the transistor T _r3 through the b contact. So the transistor
T _r1 is self-maintained and the exhaust pump 9 is operated by turning on the transistor T _r3 . By operating the exhaust pump 9, the gas generated in the wick 3 during the fire extinguishing operation is exhausted without passing through the combustion tube 6, thereby preventing the generation of odor.

As soon as the transistor T _r4 turns on, the comparators IC ₁ and IC ₂ begin to function, but because the capacitor C ₂ is not charged at first, the negative input voltage is lower than the positive input voltage, and the comparators IC ₁ and IC ₂ start functioning. Both outputs are at high level. After a certain period of time, the negative input voltage of the comparator IC ₁ becomes higher than the positive input voltage because the capacitor C ₂ is charged.
Therefore, the output of comparator IC ₁ is inverted to low level. As a result, the base current is no longer supplied to the transistor T _r2 , and the transistor T _r2 is turned off. When the transistor T _r2 turns off, the base current stops flowing, so the transistors T _r1 ,
T _r4 is also turned off. Then, the transistor T _r3 to which the base current was supplied through the transistor T _r1 is also turned off, and the exhaust pump 9 stops operating. On the other hand, since the negative input voltage of comparator IC ₂ is lower than the negative input voltage of comparator IC ₁ by the voltage drop of resistor R ₈ , the output of comparator IC ₂ is not inverted and remains at a high level.

Considering the input voltages of the comparators IC ₁ and IC ₂ after the transistor T _r1 is turned off, the positive input voltage quickly drops to the ground voltage, but the negative input voltage does not drop as much because the capacitor C ₂ is charged. It does not descend rapidly. Therefore, the output of comparator IC ₂ is inverted and becomes low level. on the other hand,
The output of comparator IC ₁ remains low level.

If the output of comparator IC ₂ becomes low level,
The capacitor C ₂ is brought into a substantially short-circuited state via a resistor R ₁₁ with an extremely small resistance value, which is provided to protect the capacitor C ₂ , and is instantly forced to discharge.

The comparator IC ₂ and the like that implement the function of forcibly discharging the capacitor C ₂ described above and returning the capacitor C ₂ to the state before power supply started is an example of the capacitor forced discharge means.

The power for the operation of these comparators IC ₁ and IC ₂ is supplied through the transistor T _r4 when it is _on , and when it is turned off, the power that was charged in the capacitor C ₃ while it was on is discharged. Powered by. Then, a while after capacitor C ₂ is discharged, capacitor C ₃ is discharged, and comparators IC ₁ and IC ₂ become unable to operate.

Eventually, the control circuit 30 will stop the operation of the exhaust pump 9 after a certain period of time, discharge the capacitor C ₂ and then stop all operations. At this time, power consumption becomes substantially zero.

An example of the power supply cutoff means is a timer reset circuit 32 that realizes a function of cutting off the power supply to the capacitor forced discharge means and the timer circuit in conjunction with the operation of the timer circuit, which starts with the operation of the changeover switch. be.

Next, when the wick 3 is raised again for combustion, the changeover switch 25 is switched to OFF during AC and OFF during BC, and returns to the initial state. That is, the capacitor _C1 is charged, and then the power consumption is set to substantially 0 and the device enters a standby state until the core 3 is lowered.

Note that the time for operating the exhaust pump 9 is determined by the charging time to the capacitor C ₂ , but the capacitor C ₂ is charged until the exhaust pump 9 is stopped and then immediately forcedly discharged by the comparator IC ₂ (the capacitor C 2 is charged until the exhaust pump 9 is stopped). Even if combustion and extinguishing are repeated within a short period of time, the operating time of the exhaust pump 9 remains constant, and the operating time will not be shortened due to residual charge in the capacitor _C2 .

Therefore, even in such cases, odor generation is sufficiently prevented.

〔Effect of the invention〕

The present invention provides a changeover switch that operates in conjunction with the extinguishing operation of an oil combustor, an exhaust means that is started by the operation of the changeover switch, and exhausts gas generated from the combustion section without passing through the combustion tube; It comprises a capacitor that starts supplying power when the switch is activated, and a voltage detection means for detecting that the charging voltage of the capacitor has reached a predetermined voltage or higher, and an exhaust operation of the exhaust means in response to a signal from the voltage detection means. and a timer circuit for stopping the operation of the oil burner, wherein the capacitor is brought into a substantially short-circuited state and forcedly discharged in response to the operation of the timer circuit to return the capacitor to the state before power supply starts. A forced discharge means for returning the capacitor, and a power supply cutoff means for cutting off the power supply to the forced discharge means for the capacitor and the timer circuit, which are started with the operation of the changeover switch, in conjunction with the operation of the timer circuit. An oil combustor odor reduction device is provided, which is characterized by:
As a result, it is possible to reduce the odor during the extinguishing operation of the oil combustor, and to consume almost no electric power except for a certain period of time during the extinguishing operation.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts of a kerosene stove including an embodiment of the odor reduction device of the present invention, and FIG. 2 is an electrical circuit for a timer circuit and a timer reset circuit that control the exhaust pump of the odor reduction device shown in FIG. 1. The circuit diagram, Figure 3, is an external view of the main parts showing the wick up/down mechanism and the changeover switch attached to it.
b shows the state at the time of extinguishing the fire, and FIG. 4 is an electric circuit diagram of an example of the timer circuit. [Explanation of symbols] 3... Core, 4... Core guide path, 5...
Fuel tank, 6... Combustion cylinder, 7... Internal space, 8... Exhaust pipe, 9... Exhaust pump, 10... Exhaust passage, 30...
Control circuit, 31... Timer circuit, 32... Timer reset circuit.

Claims (1)

[Scope of Claims] 1. A changeover switch that operates in conjunction with the extinguishing operation of an oil combustor, and an exhaust means that is started by the operation of the changeover switch and exhausts gas generated from the combustion section without passing through the combustion tube. , comprising a capacitor to which power supply is started when the changeover switch is actuated, and a voltage detection means for detecting that the charging voltage of the capacitor has exceeded a predetermined voltage, and in response to a signal from the voltage detection means, the exhaust means An odor reduction device for an oil combustor, comprising: a timer circuit for stopping the exhaust operation of the timer circuit; a capacitor forced discharge means that returns the capacitor to the state of the switch; and a power supply cutoff means that cuts off the power supply to the capacitor forced discharge means and the timer circuit in conjunction with the operation of the timer circuit, which is started when the changeover switch is operated. An odor reduction device for an oil burner, characterized by the following: