JPS6130046Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention does not extinguish the fire if there is a momentary power outage during combustion, but in the event of an earthquake, it will automatically extinguish the fire, and the liquid fuel can be easily re-ignited after the earthquake subsides. This invention relates to a control circuit for a combustion device. For safety reasons, liquid fuel combustion devices that control the liquid fuel flow rate regulator and ignition heater using electric circuits, such as pot-type kerosene stoves, are equipped with a control circuit that automatically extinguishes the fire in the event of a power outage or earthquake. It is being However, such conventional pot-type kerosene heaters automatically extinguish the fire even in the event of a momentary power outage, resulting in the inconvenience of having to relight the stove each time. Furthermore, since the vibration sensing device was also of a manual reset type, there was a complication in that the vibration sensing device could not be re-ignited unless it was manually reset.

The present invention was developed to eliminate the above-mentioned drawbacks, and by improving the control circuit, even if the power to the ignition heater and flow regulator is stopped due to a power outage, even if the power outage is momentary, the control circuit is improved. The system automatically reenergizes the ignition heater and flow rate regulator, allowing combustion to continue, and also automatically extinguishes the fire in the event of an earthquake, making it easier to re-ignite after the earthquake subsides. This is what I did.

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 is an electrical circuit diagram showing a control circuit of a pot-type kerosene stove using the present invention. In this figure, 1 is an AC power supply, from one end of this AC power supply 1 to a fuse 2, a common terminal 4 of switch 3a,
Through the normally closed contact 5, the common terminal 7 and off-side contact 8 of the operation switch 6 for switching on/off of operation, the normally closed contact 11 of the first relay coil 9 for AC and the automatic reset type seismic switch 10. AC via common terminal 12
It is connected to the other end of the power supply 1. Between the on-side contact 13 of the operation switch 6 and the other end of the AC power source 1, oil is supplied into the combustion furnace via a switch 1a which is turned on by excitation of the first relay coil 9. A series circuit of an OCV (oil volume regulator) 15, a third b switch 16, and an ignition heater 17, a resistor 18, and a diode 1 for adjusting the flow rate of the
9. The series circuits of the second relay coils 20 for direct current are connected in parallel. A capacitor 21 and a discharge resistor 23 are connected in parallel to the second relay coil 20 via the common terminal 12 and normally open contact 22 of the seismic switch 10. Said No.
3a switch 3 common terminal 4 and the operation switch 6
In parallel with the off-side contact 8, a self-holding switch 1b 24 is turned on by excitation of the first relay coil 9, and a self-holding switch 2a 25 is turned on by excitation of the second relay coil 20. is connected. Normally open contact 26 of the third a switch 3
and the common terminal 7 of the operation switch 6 is connected to a second relay coil which is turned on by excitation of the second relay coil 20.
2b switch 27 is connected. Further, the normally open contact 26 of the third a switch 3 and the AC power supply 1
A BF (combustion fan) 28 is connected between the other end and the other end. Both ends of the AC power supply 1 have RF
(Convection fan) 29 and hot air thermo switch 30
The series circuit and the ignition detection section 31 are connected in parallel. As shown in FIG. 2, the ignition detection section 31 includes an ignition sensor 32 consisting of a thermocouple installed at the bottom of the furnace or the like to detect the temperature of the burner section of the combustion device, and a signal from the ignition sensor 32. ignition detection circuit 33 that outputs a signal when the burner section is at high temperature, a transistor 34 that is turned on by the output signal of this ignition detection circuit 33, and a third relay coil 35 coupled to the collector side of this transistor 34. It is mainly composed of This third relay coil 35 is activated by its excitation.
The movable contact piece of the 3a switch 3 is switched to the normally open contact 26 side, and the 3b switch 16 is turned off to the normally open side.

Next, the basic operation of the control circuit shown in FIG. 1 will be explained using the timing chart shown in FIG. 3. When the operation switch 6 is turned off and the AC power source 1 is applied at time _t1 , the first relay coil 9 is energized as shown in FIG. 3a, and the 1a switch 14 and the 1b switch 24 are turned on. By turning on the 1b switch 24, the first relay coil 9 is self-held. Next, at t ₂ , manually turn the operation switch 6 to the normally open contact 13.
When the switch is turned to the on state, Fig. 3 b, c,
As shown in d and e, the second relay coil 20 is excited, and the 2a switch 25 and the 2b switch 2
7 is turned on, and at the same time, the ignition heater 17 is turned on, and the OCV 15 is turned on, the solenoid valve is opened, oil is supplied to the burner section and ignited, and the BF 28 is also turned on and combustion begins. 1 to 3 minutes after ignition, the temperature of the burner part rises and at _t3 , a potential difference is created in the ignition sensor 32 and a signal is output from the ignition detection circuit 33, which excites the third relay coil 35 and turns off the 3b switch 16. Therefore, the ignition heater 17 is turned off, the third a relay switch 3 is switched, and current flows from the normally open contact 26. By switching this 3a relay switch 3, the second relay coil 2
0 is instantaneously demagnetized, but is retained by the charge in the capacitor 21. As the temperature increases further, t ₄
When the hot air thermoswitch 30 is turned on, the RF 29 is turned on and a normal combustion state is entered.
When the operation switch 6 is switched to the off-side contact 8 to extinguish the kerosene stove at _{5 o'clock} , the supply of AC power 1 to the second relay coil 20 and the OCV 15 is cut off, the solenoid valve of the OCV 15 closes, and the power is supplied to the burner section. The oil supply runs out and combustion stops. When the temperature drops and the hot air thermoswitch 30 is turned off at _t6 o'clock, the RF 29 is turned off. When the temperature of the burner part further decreases and the output signal of the ignition detection circuit 33 disappears at time _t7 , the excitation of the third relay coil 35 is released, and the movable contact piece of the 3a switch 3 becomes the normally closed contact 5 side and the output signal to BF28 is removed. Since the AC power supply 1 is no longer supplied, the BF 28 is turned off and the 3b switch 16 also returns to the normally closed state.

FIG. 4 is an electric circuit diagram in which essential parts peculiar to the present invention are extracted from the control circuit shown in FIG. 1. Hereinafter, the functions peculiar to the present invention will be explained with reference to this circuit diagram. Note that the same parts as in FIG. 1 are indicated by the same symbols.

First, the operation during a power outage will be explained using FIG. 5.

In the same manner as the basic operation explained in FIGS. 1 and 3 above, combustion is started by applying the AC power source 1, holding the first relay coil 9 self-holding, and then switching the operation switch 6 from the OFF side to the ON side. Ru. In this way, at t ₁₁ the normal combustion state (from t ₄ in Figure 3)
(equivalent to the state until ₅ o'clock), the AC
The power supply 1 becomes as shown in Fig. 5a, the terminal voltage (Vr ₂ ) of the second relay coil 20 becomes a constant voltage (V 2 ) as shown in Fig. 5b, and the second relay coil 25 becomes a constant voltage (V ₂ ) as shown in Fig. 5c. turns on. If a power outage occurs at _12:00 t, the AC power supply 1 will disappear, so the first relay coil 9 will be de-energized and the 1a switch 14,
The 1b switch 24 is turned off, and the OCV 15 is also turned off, so that the solenoid valve of the OCV 15 closes and attempts to stop the supply of oil to the burner section. However, at the same time as the power outage occurs, the charge in the capacitor 21 starts discharging via the second relay coil 20.
The terminal voltage (Vr ₂ ) of the second relay coil 20 is the fifth
As shown in FIG. b, it decreases according to the time constant (Tc ₁ ) determined by the resistance of the second relay coil 20 and the capacitance of the capacitor 21. As long as this terminal voltage (Vr ₂ ) is higher than the holding voltage (Vh) of the second relay coil 20, the second relay coil 20 continues to be excited, so the 2a switch 25 is also turned on as shown in FIG. 5c. continue. Since the power outage was instantaneous (approximately 0.5 seconds), ₁ hour has passed since _12:00 t. If the power starts again at _1:00 p.m., the terminal voltage (Vr ₂ ) at this time is higher than the holding voltage (Vh). (Tc ₁ is
(set in advance to be larger than T ₁ )
The 2a switch 25 also remains in the on state. Therefore, due to AC power 1 applied again at t ₁₂ ,
Since the first relay coil 9 is excited via the 2a switch 25, the 1b switch 24 is turned on and self-maintained, and the 1a switch 14 is turned on to turn on the ignition heater 17 and OCV 15, respectively. Therefore, oil is supplied from the OCV 15 to the burner section again, and combustion continues as it is.
In this way, when the power outage time (T ₁ ) is instantaneously shorter than the time constant (Tc ₁ ), combustion continues and the normal combustion state returns. Next, suppose there is a long power outage at _14:00 . Then, in the same way as above, the terminal voltage (Vr ₂ ) begins to fall, and at t ₁₅ during the power outage, this terminal voltage (Vr ₂ ) becomes below the holding voltage (Vh), and the excitation of the second relay coil 20 is released. As shown in FIG. 5c, the second a switch 25 is turned off. For this reason, t ₁₅
time (T ₂ ) (e.g. 1 second) after t ₁₄ o'clock
Even if the AC power supply 1 is supplied after the power outage is stopped at t ₁₆ , the excitation current does not flow through the first relay coil 9. Therefore, the 1a switch 25 continues to be off, and the ignition heater 17 and OCV 15 are supplied with AC.
Since the power supply 1 is not supplied, the fire extinguishing state continues. In this way, when the power outage time (T ₂ ) is longer than the time constant (Tc ₁ ), the fire is put out in the same manner as before.

Second, the operation during an earthquake will be explained using FIG.

Assuming that the normal combustion state is entered at t ₂₁ as in the first case, the AC power source 1 will be as shown in Fig. 6a, and the terminal voltage (Vr ₂ ) of the second relay coil 20 will be as shown in Fig. 6a. The voltage becomes constant (V ₂ ) as shown in b, the second a switch 25 is in the on state as shown in c, and the seismic switch 10 remains connected to the normally closed contact 11 side as shown in d of the same figure. Therefore, the terminal voltage (Vr ₁ ) of the first relay coil 9 becomes as shown in the figure e, and the operation switch 6 turns on contact 1 as shown in the figure (f).
It is now connected to 3. Suppose that an earthquake occurs at t ₂₂ o'clock, the movable contact piece of the seismic switch 10 switches to the normally open contact 22 side as shown in _FIG . For example, it returns to the normally closed contact 11 side again at t ₂₄ when 50 msec) has elapsed. At this time, at t ₂₂ , e
The terminal voltage of the first relay coil 9 (Vr ₁ ) is as follows.
disappears, its excitation is released, and the 1a switch 1
4. The 1b switch 24 is turned off. Then,
The AC power 1 supply to the OCV 15 is cut off, oil supply to the burner section is stopped, and the fire goes out.
At this time, the supply from the AC power source 1 to the second relay coil 20 is also stopped. Furthermore, since the charge in the capacitor 21 is discharged not only to the second relay coil 20 but also to the discharge resistor 23 while the seismic switch 10 is connected to the normally open contact 22, the terminal voltage (Vr ₂ ) is , the resistance of the second relay coil 20 (rl)
and rapidly decreases according to the time constant (Tc ₂ ) during discharging determined by the capacitance of the discharge resistor 23 and the capacitor 21. (This Tc ₂ is set in advance so that it is smaller than T _3. ) It reaches t ₂₃ within time (T ₃ ) and this terminal voltage (Vr ₂ ) becomes below the holding voltage (Vh). Since this is set, the excitation of the second relay coil 20 is released and the second a switch 25 is switched to the OFF side as shown in FIG. Therefore
Even if the movable contact of the seismic switch 10 automatically returns to the normally closed contact 11 side at t ₂₄ , when time (T ₃ ) has elapsed since t _22:00 , the AC power 1 is not supplied to the first relay coil 9. It never happens. Therefore, the extinguishing state continues. Next, we will explain the case where the fire is reignited after the earthquake subsides.

First, at t ₂₅ , when the movable contact piece of the operation switch b is connected to the off-side contact 8, the AC is applied to the first relay coil 9 through the operation switch 6 as shown in the figure e.
Power supply 1 is supplied. Therefore, the first relay coil 9 is excited, the 1a switch 14 and the 1b switch 24 are turned on, and the first relay coil 9 is self-held. When the movable contact piece of the operation switch 6 is switched to the ON side contact 13 at t ₂₆ , the AC power 1 is supplied to the OCV 15 and the ignition heater 17, oil is supplied from the OCV 15 to the burner section, and the ignition heater 17
ignites and starts combustion. Furthermore, since power is also supplied to the second relay coil 20 via the resistor 18 and diode 19, the terminal voltage (Vr ₂ ) gradually increases as shown in FIG. Then, at time t ₂₇ , when this terminal voltage (Vr ₂ ) reaches the operating voltage (Va) of the second relay coil 20 as shown in b of the same figure, the second relay coil 20 is excited and as shown in c of the same figure. Switch 2a 25 is turned on. In this way, normal combustion conditions are restored. In this way, when re-igniting after the earthquake has subsided, it is only necessary to turn off the operation switch 6 and then turn it on again.

In the above embodiment, the case of a control circuit for a pot-type kerosene stove was explained, but the present invention is not limited to this. Can be widely used in equipment.

Since the present invention is configured as described above, even if there is a momentary power outage, it will automatically reignite and continue combustion, and when an earthquake occurs, the seismic switch will open and close instantly. If you want to relight the device after the fire has been extinguished and the earthquake has subsided, you can do so simply by turning the operating switch off and then on again.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing one embodiment of the control circuit of the liquid fuel combustion device according to the present invention, Fig. 2 is an electric circuit diagram of the ignition detection section, and Fig. 3 is a time chart showing the basic operation of Fig. 1. , FIG. 4 is an electric circuit diagram of the main parts peculiar to the present invention extracted from FIG. 1, and FIGS. 5 and 6 are time charts of the present invention. 1...AC power supply, 6...operation switch, 7...
Common terminal, 8...Off side contact, 9...First relay coil, 10...Seismic switch, 11...Normally closed contact, 12...Common terminal, 13...On side contact, 1
4...1a switch, 15...Flow (oil) amount regulator, 17...Ignition heater, 20...Second relay coil, 21...Capacitor, 22...Normally open contact,
23...discharge resistor, 24...1b switch, 2
5...Second a switch.

Claims (1)

[Scope of utility model registration request] a first relay coil and a normally closed contact and common terminal of an automatic reset seismic switch are connected in series between both ends of a power source via a common terminal and off-side contact of an operation switch which switches operation on and off; an ignition heater, a liquid fuel flow regulator and a second relay coil are each connected in parallel to the power source via a 1a switch which is turned on when the first relay coil is energized, via the common terminal and on-side contact of the operation switch; a capacitor and a discharge resistor which is connected in parallel to the second relay coil via the common terminal and normally open contact of the seismic switch; and a self-holding switch 1b which is turned on when the first relay coil is energized and a self-holding switch 2a which is turned on when the second relay coil is energized are connected in parallel to the common terminal and off-side contact of the operation switch.