JPS5986840A - Safety device of burning apparatus - Google Patents

Abstract

PURPOSE:To contrive energy saving, by a method wherein a radio signal is generated when incomplete burning is detected, a fan is revolved by receiving the signal by a ventilator, through which automatic ventilation is carried out. CONSTITUTION:When a burner 5 is turned into incomplete burning due to lack of indoor oxygen, electromotive force ls of about 0.8V is generated by a sensor 7. To invert and amplify the electromotive force an output lo of a detecting circuit 7 is turned into la-(1+R23KlR22).ls and becomes lower than electric potential la. Because of the above the electric potential la becomes lower than electric potential lb, an output of a comparator 24 is turned into a low output (short-circuited with a line of an electric power source 17), and a luminous diode 9 is electrified and becomes luminous. With this construction, a phototransistor 10 is electrified and its collector potential is short-circuited with a line of an electric power source 25. The collector potential is made lower than potential lc because of the above structure, an output of a comparator 28 becomes low and a relay 29 is electrified. With this construction, a contact point 29' is electrified, a fan motor 14 is revolved for ventilation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an indoor open combustion device configured to burn fuel such as gas or oil indoors and release its exhaust indoors.
This relates to a safety device against incomplete combustion caused by oxygen deficiency, etc.

Conventional structure and its problems In recent years, as houses have become more airtight, the number of accidents due to lack of oxygen in indoor open combustion equipment such as stoves, fan heaters, and water heaters has increased, and the installation of safety devices is becoming commonplace. . the current,
Many of these types of safety devices automatically stopped combustion by detecting incomplete combustion, or activated ventilation fans at the same time as the appliance was used. The former is often used in fan heaters, stoves, etc., but if it is extinguished while the room is being heated, it will be cold, and people will need to ventilate the room by opening windows.

The latter has a configuration as shown in FIG.

Figure 7 takes the gas instantaneous water heater 1 as an example.
A switch (not shown) is operated in conjunction with the ignition knob 2 to rotate the ventilation fan 3, and when the knob 2 is stopped, the ventilation fan 30 rotations are also stopped.

In this case, there is no problem with devices that are only used for a short period of time, such as instantaneous water heaters, but if the ventilation fan operates while a heating device such as a stove or fan heater is in use, the heating effect decreases, resulting in no energy savings. .

Furthermore, there is a plan to combine these to detect incomplete combustion in combustion equipment and operate a ventilation fan, but the above-mentioned heating equipment is characterized by being moved indoors, and the lead wire that connects to the ventilation fan is a huge hindrance. become.

Purpose of the Invention The present invention solves these conventional drawbacks, and provides a safety device for preventing incomplete combustion that provides safe and reliable ventilation, is no different in use from conventional devices, and achieves energy savings. With the goal.

Structure of the Invention In order to achieve this object, the present invention includes an incomplete combustion detection sensor, which generates a wireless signal when incomplete combustion is detected, and a ventilation device installed in the same room receives this signal. The fan rotates and automatically ventilates the air.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be explained using FIGS. 1 to 6.

FIG. 1 is a block diagram showing an embodiment of the present invention, and the explanation is given using a gas burner as an example. 4 is a gas inlet, and is ignited by an igniter (not shown) in a burner 5 to cause combustion. Reference numeral 6 indicates a combustion state detection sensor, and here, an example using a zirconia element (ZrO2), which is an oxygen concentration battery, is shown. This sensor is a well-known sensor that generates an electromotive force when the ratio of oxygen concentration between reference air (indoor air) and combustion exhaust gas is large. In addition to this, various sensors such as a sensor that detects oxygen partial pressure and a flame rod that detects ion conduction within a flame can be used, but any sensor that can detect incomplete combustion may be used.

A circuit 7 detects the combustion state of the burner 5, and outputs a signal to the transmitting circuit when the burner 5 becomes incompletely burnt due to lack of oxygen in the room. The transmitter circuit 8 transmits a predetermined signal from the transmitter 9.

A receiving section 10 receives the signal transmitted from the transmitting section 9 and transmitted through the air. The receiving circuit 11 controls the motor 14 that drives the fan 13 of the p-ventilator 12 using this signal.

In this embodiment, the transmitting section 9 and the receiving section 10 will be explained using an infrared light emitting element and a light receiving element, but they may be of ultrasonic waves, radio waves, or other elements.

FIG. 2 shows an example of this specific circuit. The left side 15 of the figure shows a circuit section built into the combustion equipment, and the right side 16 shows a circuit section built into the ventilation system 12.

Divided potentials ea and eb are obtained by resistors 18 and 19.20 connected to the DC power supply 17. The potential ea is connected to the ■ side electrode of the zirconia oxygen concentration sensor 6, which is connected to the negative input terminal of the detection circuit 7 (an inverting amplifier is formed by the operational amplifier 21 and the resistors 22 and 23), and the O side electrode of the sensor is connected to the It is connected to a positive input terminal, and its output is input to a transmitting circuit 8 made up of a comparator 24.

The potential is also input to the transmission circuit 8 and compared with the output potential of the detection circuit 7. The output of the comparator 24 is connected to an infrared light emitting diode 7 (transmitter).

Further, a phototransistor 10 (receiving section) and resistors 26 and 27 are connected to the DC power supply 25, and the -piezoelectric potential eC
and the collector potential of the phototransistor 10 is the receiver circuit 1
1 (consisting of comparator 28). The output of the comparator 28 is connected to the relay 29.
The contact 29' turns on and off the fan motor 14 connected to the AC power source 30.

Next, the operation will be explained. Normally, when the burner 5 is burning normally, the output of the sensor 6 is almost atmospheric, and the detection circuit 7
The output of is at the same potential as ea. Since the potential ea>eb, the output of the comparator 24 becomes a high output. (Since the comparators 24 and 28 are open collector outputs, when the output is high, it is equivalent to being open.) Therefore, the light emitting diode 9 does not emit light. In this case, the receiving circuit 11 also does not operate and the contact 29' of the relay 29 is open, so the fan motor 14
has stopped.

When the burner 5 undergoes incomplete combustion due to lack of oxygen in the room, the sensor 7 generates an electromotive force eS of about 0.8 . The detection circuit 7 inverts and amplifies this output signal.
a-(1+R23/R22)·eS is lower than the 9 potential ea. Therefore, ea<eb, and the output of the comparator 24 becomes a low output (shorted to the O line of the power supply 17), and current flows to the light emitting diode 9, which emits light. As a result, the phototransistor 10 becomes conductive, and its collector potential is shorted to the O line of the power supply 25. From the above, the collector potential decreases as well as the potential eC, and the comparator 28
also becomes a low output, and the relay 29 is energized.

This causes the contact point 29' to conduct, causing the fan motor 14 to rotate and provide ventilation. When the oxygen in the room returns to normal due to the ventilation of the fan, the output of the sensor 6 disappears and the fan motor 14 also stops.

FIG. 3 shows an example of a system applied to a fan heater 30. The light emitting section 9 and the light receiving section 1o are illuminated at a wide angle by a lens or the like, making it possible to drive the ventilation device 12 no matter where the fan heater 30 is placed in the room. Here, the ventilation device 12 is explained using a wall-mounted ventilation fan, but a duct type ventilation device has exactly the same effect.

FIG. 4 is a block diagram showing another embodiment.

In the configuration shown in FIG. 4, a safety circuit 32 is provided which detects this and closes the fuel valve 31 if the oxygen deficiency is not improved even if the ventilation device 12 is operated.

The fuel valve 31 may be a fuel pump when used in an oil burner or the like, or may be of any type as long as it has a function of stopping combustion. The transmitting circuit 8 is configured to only output an operation start signal for the ventilation device 12, and the ventilation device 12 has a timer circuit 33 that operates at the same time as the operation starts, and receives a signal when the fan 13 rotates for a certain period of time. Part 1
It is configured to stop regardless of the o signal. Further, here, the transmitting circuit is configured to convert the signal into a digital signal and transmit the signal.

FIG. 5 shows an example of this specific circuit. Parts that operate the same as those in Figure 2 are numbered the same. Comparator 24 is shown in Fig. 2 and eO2
The eb input is reversed. The configuration is such that the output is low when the fuel is full and the output is high when there is a lack of oxygen. The transmitting circuit 8 is configured to output a predetermined digital signal when the comparator 24 outputs a high signal.
blinks in response to this signal. The digital signal receiving circuit 11 checks the digital signal received by the phototransistor 10 and sets the output ed to high when the signal is normal.

The negative input terminal of the comparator 34 of the timer circuit 33 receives a potential ef obtained by dividing the potential ed by a resistor 36, and the positive input terminal receives a potential eq obtained by dividing the potential ed by a resistor 36 and a capacitor 38. ing.

When the potential ed becomes a high output, since the capacitor 38 is not charged, ef>eq, the output @ becomes low, the relay 29 becomes conductive, and the fan motor 14 rotates. When the capacitor 38 is charged and the potential becomes eq>ef, the fan motor 14 stops.

In other words, the fan motor 14 is configured to rotate for a certain period of time in response to a signal from the receiving section 11, thereby preventing a drop in the room temperature due to heating or the like. (Instead of the timer device 33, the stop signal for the fan motor 14 may be output from the transmitter 9.) Also, the transmitter circuit 8 and the receiver circuit 11 use digital signals to prevent malfunctions caused by noise from other light sources. .

Further, the output of the comparator 24 is simultaneously input to the safety circuit 32. Here, too, a timer circuit is configured using a comparator 39, and the comparator 24 outputs a low output (
During normal combustion), the output eh becomes a low output and the valve 31
conducts the gas to the burner 5. Here comparator 2
When the output of 4 becomes high, initially the resistor 40 and capacitor 41
Although the divided potential e1 of the resistor 42.43 is lower than the divided potential ei of the resistor 42.43, the capacitor 41 is charged with el>ei
Therefore, the output eh becomes a high output. This allows valve 3
1 is cut off, gas is no longer supplied to the burner, and burner 5 is extinguished. At this time, a buzzer or the like may be used to notify the user. In other words, the burner 6 is extinguished when the combustion condition is not improved even after a certain period of time has elapsed since the ventilation device 12 was activated.

Here, the safety circuit 32 does not use a timer device, but it is also possible to make a determination based on the output level of the sensor 6. In other words, a configuration may be adopted in which the ventilator 12 is driven when the sensor 6 reaches the first set level, and the safety circuit 32 is driven when the incomplete combustion progresses and the second set level is reached.

FIG. 6 shows another system example. Fan heater 30, gas opener 44, and instantaneous water heater 45 in the same ventilation system 12
Ventilation is possible by signals from multiple devices such as
It is safe even when multiple combustion devices are used in the same room.

In addition, if one ventilation device 12 is installed in each room, you can rest assured that the ventilation device in the room will operate no matter where you take movable combustion equipment such as stoves and fan heaters. The circuit shown in FIG. 5 is an example, and various other circuit configurations are possible.

As described in detail, the safety device for the indoor open combustion equipment of the present invention is safe even when used for a long time because the ventilation system automatically operates when incomplete combustion occurs due to lack of oxygen. Ventilation is performed only when and as needed, so there is less wasted energy.Combustion equipment and ventilation equipment transmit signals wirelessly, so the combustion equipment can be moved freely without being limited to the installation location, making it easy to use. is the same as before.Furthermore, safety can be further improved by using a safety circuit that stops combustion if incomplete combustion is not improved even if the ventilation device operates.

Furthermore, since one ventilation device can be driven by signals from a plurality of combustion devices, the system is simple and inexpensive, and has many effective effects, making it a valuable industrial device.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the safety device for indoor open type combustion equipment of the present invention, Fig. 2 is a specific circuit diagram thereof, and Fig. 3 shows an example in which it is applied to a fan heater. Figure 4 is a system diagram showing another embodiment.
FIG. 5 is a specific circuit diagram thereof, FIG. 6 is a system diagram showing another application example, and FIG. 7 is an explanatory diagram of a conventional ventilation fan-linked water heater. 6... Burner part, 6... Incomplete combustion detection sensor, 9... Infrared light emitting diode (transmitting part), 10... Phototransistor (receiving part) ,
12... Ventilation device, 13... Fan,
32... Safety device, 33... Timer device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] (1) A burner section that releases combustion exhaust indoors for combustion;
It has a sensor that detects incomplete combustion in the burner section, a transmitter that emits a predetermined signal into the air based on the output of the sensor, a receiver that receives the signal from the transmitter, and a receiver that receives the signal from the receiver. A safety device for combustion equipment that includes a ventilation device that rotates a fan that ventilates indoor air. (2) The ventilation device has a timer device that automatically stops when the receiving section rotates for a certain period of time after receiving the signal. (3) The sensor is the burner section. A safety device for a combustion appliance according to claim 1, which is configured to detect incomplete combustion and output a signal to a safety circuit that stops combustion if the incomplete combustion is not improved even after the transmission by the transmitter. . (4) The receiving part is configured to drive the ventilation device based on signals from a plurality of indoor transmitting parts.
A safety device for combustion equipment as described in paragraph 2 or paragraph 2.