JPH05312407A - Open type combustion heater - Google Patents

Abstract

PURPOSE:To provide an open type combustion heater in which its operation is stopped at a specified time after starting operation with a timer means to prevent trouble or accident caused by contamination of indoor air, its informing is carried out before stopping operation, air ventilation is performed and a heating operation can be extensively carried out. CONSTITUTION:An operation switch 2 is manually operated to instruct a starting of operation, a load circuit 4 is electrically energized so as to start a heating operation. An oscillation circuit 10 starts oscillation, a binary counter 18 starts to count time with an output signal and an electronic buzzer 24 informs a stopping of operation before the counter 18 counts the specified time and produces a stopping signal for instructing the stopping of operation. A user performs an indoor ventilation through this informing operation, manually operates an extension switch 21 and causes the time counting operation of the counter 18 to be newly carried out from this time so as to extend the heating operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open combustion type heater using kerosene or gas, and more particularly to a safety device therefor.

[0002]

2. Description of the Related Art An open-combustion type heater uses indoor air as combustion air and discharges combustion gas after combustion into the room. This type of heater is, for example, a forced convection type that has a structure in which the generated combustion gas is forcibly blown out from the front by a convection blower provided on the back of the heater main body, so that the kerosene gas Oil fan heaters that are turned into gas and then burned have been announced one after another, and it is not necessary to provide an air supply / exhaust tube like a so-called forced air supply / exhaust type heater, and it is easy to carry and hot air can be easily heated. Since it can provide heating, it is becoming widely used in general households.

However, in such a heater, since the room air is simply circulated to operate, the oxygen concentration in the room becomes lower as the combustion time elapses.
Eventually, incomplete combustion will occur, the concentration of carbon monoxide will increase conversely, and headaches etc. will occur, which may cause sickness and eventually life-threatening accidents. The inside is a cautionary note to replenish fresh air by ventilating once or twice a hour.

However, there are cases in which it is inadvertently forgotten to consciously perform periodical ventilation, and there are cases in which the air in the room remains contaminated. Therefore, it has been proposed to measure the carbon monoxide concentration or the oxygen concentration in the room air to give an alarm, or to automatically activate the ventilation fan.

[0005]

However, a sensor for detecting carbon monoxide or oxygen generally has many inconveniences such as a large variation in sensitivity and a change over time. Therefore, the price of each sensor is relatively high. And
Especially in the case of a forced convection type heater using kerosene, the combustion temperature was considerably high, so there were very few sensors with high practical value.

The present invention has been made in view of the above points, and prevents the accident due to contamination of indoor air by stopping the operation at a fixed time after the operation is started by the timer means.
It is an object of the present invention to provide an open-combustion heater that can perform heating operation by extending notification by performing notification and ventilation before operation stop.

[0007]

In order to achieve the above-mentioned object, the open combustion type heating machine of the present invention has an operation switch for instructing the start of operation by manual operation, and the operation is started by the instruction of this operation switch. However, in an open-combustion heater that discharges the combustion gas generated by combustion in the combustion section into the room, the timekeeping operation is automatically started in relation to the operation instruction of the operation switch, and a fixed time has elapsed after the start of the timekeeping operation. Timer means for generating a stop signal for instructing a stop of operation, a means for controlling operation stop by receiving the stop signal from the timer means, and an operation before the stop signal is generated from the timer means. The notification means for notifying the stop and the control signal generated by the manual operation control the timed content of the timer means, and the stop operation is restarted from the time of the manual operation. And a extension switch to perform the time counting operation to generate a signal.

[0008]

In the above open-combustion heater, the timer means starts the clock after the operation is started, the fixed time is measured, and the alarm means notifies before the operation stop signal is generated. In addition to preventing accidents due to pollution, the notification means informs that the operation will stop before the operation stops,
After the user ventilates according to this notification, the heating operation is extended by operating the extension switch.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an open combustion type heater according to the present invention will be described below with reference to the drawings. FIG. 1 is an electric circuit diagram of a forced convection heater according to an embodiment of the present invention, and FIG. 2 is a time chart showing its operation. 3a and 3b are schematic diagrams showing examples of knobs for adjusting the ventilation alarm cycle.

In the figure, reference numeral 1 designates a switch whose contacts are separated only during push and push to stop the operation of the heater. Reference numeral 2 denotes an operation switch for starting operation, the contacts of which are connected only when pushing. Reference numeral 3 is a relay contact connected in parallel with the operation switch 2 for starting the operation. Reference numeral 4 is a load circuit of a heater, 5 is a control transformer, 6 is a rectifier, 7 is a power supply capacitor, and 8 is PNP.
A relay connected to the collector of the transistor 9,
It has the relay contact 3.

Reference numeral 10 is an oscillation circuit composed of a PNP transistor 11 and NPN transistors 12 and 13. The oscillation frequency of the oscillation circuit is determined by a capacitor 14, a charging resistor 15 and a discharging resistor 16 and is output from the collector of the PNP transistor 11. The discharge resistor 16 is the switch 1
The frequency can be adjusted by switching the resistors a, b, c, d, and e by 7.

Reference numeral 18 is a binary counter, which constitutes timer means by connecting the output signal A of the oscillation circuit 10 to a clock input terminal. The capacitor 19 and the resistor 20 constitute an auto clear circuit and are for clearing the binary counter 18 when the power is turned on.
Reference numeral 21 is an extension switch that can arbitrarily clear the binary counter 18 only when it is pushed and delay the generation of a signal instructing to stop the operation.

Reference numeral 22 denotes an output signal A of the oscillation circuit 10 and an output signal B having a period 27 times that of the output signal A.
(Q ₇ ) and an output signal C (Q ₁₂ ) having a period of 2 ¹² times
Is an AND gate whose input is, 23 is an NPN transistor connected to the output terminal of this AND gate, and 24
Is an electronic buzzer connected to the collector side of the NPN transistor, its oscillation frequency is about 2 KHz, and is controlled to be generated intermittently by the output signal B. An output terminal (Q ₁₃ ) for generating an output signal D having a period 2 ¹³ times that of the output signal A is connected to the base of the PNP transistor 9.

Reference numeral 25 denotes a knob of the switch 17 mounted on the front panel (not shown) of the forced convection heater, which switches the discharge resistor 16 to a, b, c, d, e. It is possible to select and set the ventilation alarm cycle according to the case of using on 4.5 tatami, 6 tatami, 8 tatami, 10 tatami and 12 tatami. Reference numeral 26 is a knob of a variable resistor, which allows the discharge resistor 16 to be set steplessly. In other words, as the room used grows wider, the alarm cycle becomes longer, and when used in a room of 6 tatami mats, an alarm is generated about twice a hour to burn air pollution in the room due to combustion. It is to be relieved on a regular basis.

Next, the operation of the embodiment of the present invention having the above structure will be described with reference to the time chart shown in FIG. First, the operation switch 2 is pushed and the power is turned on. Now, for example, assuming that a heater with a calorific value of about 300 Kcal is used in a room with a standard size of 6 tatami mats, the switch 17 is switched so that the discharge resistance 16 has a resistance value b and the cycle is changed. Is adjusted to an oscillation frequency (output signal) A of 1 second (T ₁ ),
The output terminal of the binary counter 18 (Q ₇₎ is an output signal B 2 ⁷ times the cycle 128 seconds generated from High signal period 64 seconds (T _2), Low signal period 64 seconds (T _3), and the
A control signal for causing the electronic buzzer 24 to sound is generated at a cycle of about 1 minute and 1 second.

Furthermore, the output signal C is generated from the output terminal (Q ₁₂ ) by a period of 2 ¹² times 4096 seconds, and the High signal period is 2048 seconds (T ₄ ) and the Low signal period is 2048 seconds (T ₅ ).
The electronic buzzer 2 is started in about 34 minutes from the start of operation of the heater.
Generate a signal to activate 4.

Since the output signals A, B and C are input to the AND gate 22, the output signal E of the AND gate 22 has the oscillation frequency A having the period T ₁ and the periods T ₂ and T _3.
The output signal C starts to be generated at least after a lapse of at least a period T ₅ , that is, about 34 minutes from the start of operation.

The signal E causes the NPN transistor 23 to operate and the electronic buzzer 24 to sound. Although the electronic buzzer 24 has a natural frequency of about 2 KHz, it emits an intermittent alarm sound with a period of about 1 second as described above. When the power is turned on, the count of the binary counter 18 is always cleared by the auto clear circuit composed of the capacitor 19 and the resistor 20, and the count starts from the start of the operation of the heater.

After the operation of the electronic buzzer 24 is started,
To be precise, as shown in the time chart of FIG.
₆ , (T ₆ = T ₅ + T ₃ ), that is, after about 35 minutes, a sound is emitted and an alarm is issued to the user to ventilate the room. Since the duration T ₂ of sound generation is about 1 minute, for example, the time for ventilating the air in the room by opening a window or the like,
In other words, it can also be used as a guide for the ventilation execution time, and when the sound of the electronic buzzer 24 stops, this time, after closing the windows etc., push the extension switch 21 to clear the timed content of the binary counter 18 and count again. To start.

Therefore, the operation is continued and the alarm is issued again after 35 minutes as described above. In this way, when the extension switch 21 is operated, it becomes the same as starting the timing operation again from that point, so that the heating operation can be extended without stopping the operation. Therefore,
In the case of an oil fan heater, it is possible to prevent the generation of odor during digestion or ignition that occurs when the operation is stopped once.

Now, when the period T ₇ , (T ₇ = T ₄ −T ₃ ), that is, about 33 minutes, has elapsed since the electronic buzzer 24 was activated, the output terminal (Q ₁₃ ) of the binary counter 18 is operated. , Output signal D that is inverted from "Low" to "High"
Occurs and is input to the base of the PNP transistor 9. Then, the PNP transistor 9 is turned off to stop energizing the relay 8, so that the relay contact 3 is opened.
The power will be shut off. Therefore, the operation of the heater is stopped, and the indoor air is prevented from being polluted any more. That is, the PNP transistor 9, the relay 8 and the relay contact 3 serve as means for receiving the signal D and controlling the stop of the operation of the heater.

Thus, in the case of 6 tatami mats, the extension switch 2
A signal D for stopping the operation after a substantially constant time (about 68 minutes) from the operation of the operation switch 2 unless 1 is operated.
The (stop signal) is automatically output, and the operation is automatically stopped. As mentioned above, the time to stop operation is
Although it is a fixed time, when the extension switch 21 is consciously operated by performing ventilation or the like during operation as described above, the generation of the signal D instructing operation stop is delayed by that amount when viewed from the start of operation. .. Therefore, the heating operation is extended by that amount when viewed from the start of the operation.

It is desirable that the above-mentioned fixed time is a time during which the indoor air does not reach an oxygen concentration or a carbon monoxide concentration that is harmful to the human body when the device is used in a normal state. However, this time can vary depending on the combustion amount of the equipment, combustion performance, place of use, etc., and the level of carbon monoxide or oxygen that adversely affects the human body. It must be a time that can prevent a serious fatal accident caused by pollution of the. Therefore, the shorter this time is, the better. However, considering the usability of the heater, in this embodiment, the idea of once-per-hour ventilation is used.

Next, when the heater is used in a room of about 12 tatami mats, if the knob 25 is set to the 12 tatami mat side, the discharge resistance 16 becomes the resistance value e and the oscillation frequency A '( The output signal) is 2 seconds, which is about twice the oscillation frequency A (output signal) when the 6-mat side is set. Therefore, the output signal C ′ is T ₅ ′ = 2048 × 2 (seconds), about 6
It becomes 4 minutes, and the electronic buzzer 24 is activated about 1 hour after the start of the operation of the heater, and an alarm sound is produced by opening the windows and the like to promote ventilation in the room.

When used in a room of 12 tatami mats as described above, the output signal B'is equal to 2 of the output signal B (cycle T ₃ ).
It doubles to about 2 minutes. That is, the ventilation execution time can be increased or decreased according to the size of the room. or,
It takes about 2 hours to stop the operation. Instead of the electronic buzzer 24, an alarm lamp may be turned on or blinked.

As described above, if the extension switch 21 is not operated, the operation is stopped for a limited time. However, if the extension switch 21 is operated at that time, for example, when the ventilation is started quickly, the operation is started. Seen from the time is extended. In other words, the extension switch 21 is a switch having a function of automatically stopping the operation within a driving time from the time of the operation to prevent an accident due to the contamination of the indoor air.

[0027]

As described above, according to the present invention, even when the operation start is instructed by the operation switch, the operation is always automatically stopped with the operation time that does not cause the accident due to the contamination of the indoor air. Therefore, it is possible to improve the safety when using this type of forced convection heater that does not include a supply / exhaust pipe. Moreover, since the notification means informs that the operation will be stopped before the stop signal is generated from the timer means, this notification prompts ventilation, and when continuing heating, the user extends after ventilation. The heating operation can be extended by operating the switch, the heating operation can be safely continued without causing an accident due to contamination of indoor air, and usability can be improved.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a forced convection type heater showing an embodiment of an open combustion type heater of the present invention.

FIG. 2 is a time chart showing the operation of the forced convection heating device of FIG.

3 (a) and 3 (b) are schematic views showing an embodiment of a knob for adjusting a ventilation alarm cycle.

[Explanation of symbols]

 2 Operation switch 4 Heater load circuit 8 Relay 9 Transistor 10 Oscillation circuit 18 Binary counter 21 Extension switch 24 Electronic buzzer

Claims (1)

[Claims] 1. An open combustion heating system which has an operation switch for instructing an operation start by a manual operation, starts the operation in response to an instruction of the operation switch, and releases combustion gas generated by combustion in a combustion section into a room. In the machine, a timer means for automatically starting a timing operation in relation to the operation instruction of the operation switch, generating a stop signal for instructing an operation stop by measuring a fixed time after the start of the timing operation, and the timer means Means for controlling the stop of the operation in response to the stop signal, a notification means for notifying that the operation is stopped before the stop signal is generated from the timer means, and a control signal is generated by a manual operation, By controlling the timed content of the timer means, from the time of manual operation,
An open-combustion heating machine comprising: an extension switch for performing a timing operation for generating the stop signal.