JP2651115B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus of the type supplying operating power from a battery.

[0002]

2. Description of the Related Art As a combustion device, for example, in a gas stove, a burner is supplied with gas from a gas pipe and burns, an electromagnetic safety valve disposed in a gas pipe, and an ignition for detecting whether or not the burner is burning. Detection circuit, overheating detection circuit that detects overheating of the cooking object, safety monitoring circuit that closes the electromagnetic safety valve when misfire or overheating is detected, and operation of the electromagnetic safety valve and each circuit A battery having a battery storing power for use has been conventionally known.

[0003]

SUMMARY OF THE INVENTION In the above gas stove,
When the excessive temperature rise is detected, the electromagnetic safety valve is closed and the gas stops automatically. At this time, it is preferable to alert the user.

The inventors of the present invention provide a buzzer that sounds a buzzer when the electromagnetic safety valve is closed, and provides a buzzer circuit for notifying that an abnormality requiring attention such as overheating has occurred. We prototyped a gas stove in which the buzzer sounds until the point / fire switch is manually returned to the fire-extinguishing position.

However, this prototype has the following new problems. If an abnormal condition occurs while the user is away from the gas stove, the buzzer continues to sound forever, shortening the battery life.

Therefore, it is conceivable to provide a timer for measuring a predetermined time after the occurrence of an abnormal state, and to make a notification only while the timer is counting. Since a timer must be provided, manufacturing costs increase, which is not preferable.

[0007] An object of the present invention is to provide a combustion apparatus in which the notification means can be simplified without separately providing a timer, and the notification is performed for an appropriate time only when an abnormality that calls the user's attention occurs.

[0008]

In order to solve the above-mentioned problems,
The present invention employs the following configuration. (1) an electromagnetic safety valve disposed in a gas pipe for supplying gas to a burner, a thermocouple facing the burner, and abnormality detecting means for detecting an abnormality that requires attention of a user; Safety monitoring means for closing the electromagnetic safety valve when the abnormality detecting means detects an abnormality, and when the electromagnetic safety valve is closed by the safety monitoring means, the output of the thermocouple maintains a predetermined value or more. And a battery that stores power for operation.

(2) In addition to the configuration of (1), if the operating means for stopping combustion of the burner is operated while the notification means is informing, the notification is stopped.

[0010]

[Action]

[Claim 1] A thermocouple which generates an electromotive force by heating faces a burner, and ignition and misfire of the burner are detected based on the output of the thermocouple. In addition, abnormality detection means for detecting an abnormality that needs to call the user's attention is provided, and when an abnormality is detected by the abnormality detection means, the electromagnetic safety valve is forcibly closed to stop gas supply, and The notifying means notifies.

The notification means stops the notification when the output of the thermocouple falls below a predetermined value.

Therefore, the notifying means performs the notification only for a time period from the occurrence of the abnormality until the output of the thermocouple drops below the predetermined value.

According to a second aspect of the present invention, when the electromagnetic safety valve is closed, the notifying means performs the notification while the output of the thermocouple facing the burner is maintained at a predetermined value or more. When is set to the fire extinguishing position, the notification is stopped.

[0014]

【The invention's effect】

[Claim 1] When an abnormality that requires the user's attention occurs, the electromagnetic safety valve is closed and the output of the thermocouple exposed to the burner is maintained at a predetermined value or more. The notification means performs the notification.

For this reason, the notification is performed only for an appropriate time from the occurrence of the abnormality to the time when the output of the thermocouple falls below the predetermined value, so that it is reasonable and the consumption of the battery can be prevented. Further, since the time from when the combustion of the burner is stopped until the output of the thermocouple becomes less than the predetermined value is used instead of the timer, the timer circuit can be omitted, so that the configuration of the notification means can be simplified. .

According to a second aspect of the present invention, when the user recognizes the abnormal state by operating the operating device to the fire extinguishing position, the operating is stopped. For this reason, unnecessary notification can be prevented, and the battery is prevented from being consumed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in the figure, the gas stove A (part related to the M burner 11) includes an electromagnetic safety valve 1, an ignition detection unit 2 for detecting the ignition of the M burner 11, and a container bottom 3 of the cooking container 31.
It is necessary to call attention to the user by the thermistor 3 for detecting the temperature of 11, safety monitoring means 4 for shutting off the power supply to the electromagnetic safety valve 1 in case of a misfire or fear of overheating of the oil, and a buzzer 51. A notification means 5 for notifying that an abnormality has occurred, and a battery 6 are provided.

In the present embodiment, the abnormalities that require the user's attention correspond to abnormally high oil temperature, disconnection of the thermistor 3, and decrease in battery voltage.

Reference numeral 71 denotes an H burner; 72, a battery box; 73, an LED for indicating that the battery has run out; 74 to 76, a point / fire extinguishing knob; 77, a thermosensitive cylinder having a thermistor 3 therein;
8 is a grill burner.

The electromagnetic safety valve 1 is disposed in the gas line 12 and is opened when battery power is supplied through the driving transistors 13 and 14 and the resistor 15.
1 is supplied with gas.

The ignition detecting means 2 receives the thermoelectromotive force output from the thermocouple 21 and outputs an Lo level output when the thermoelectromotive force is equal to or higher than the ignition detection level. N to invert output to be sent
The OT circuit 23 forms a main system. Further, a sub-system is configured by the ignition detection circuit 24 that receives the thermoelectromotive force output from the thermocouple 21 and sends out a Hi-level output when the thermoelectromotive force is equal to or higher than the ignition detection level.

The thermistor 3, whose electric resistance value decreases as the temperature rises, passes through the resistor 32 via the stabilized voltage (1.
5V) is applied, and the output voltage 33 decreases as the temperature rises.

The safety monitoring means 4 determines that the output voltage 33 is 265
A Hi cut circuit 41 (comprising a comparator or the like) whose output switches from a Hi level to a Lo level when the temperature falls below a value corresponding to ° C, an output of the Hi cut circuit 41 and a NOT circuit 2
A main circuit is constituted by an AND circuit 42 for inputting the output of No. 3, a timer circuit 43 whose output switches from Hi → Lo level when the input of Lo level continues for 7 seconds, and the transistor 13.

When the thermistor 3 is disconnected, the output becomes Hi.
An AN that inputs the disconnection detection circuit 44 that switches to the Lo level and the outputs of the disconnection detection circuit 44 and the ignition detection circuit 24
A D circuit 45 and a timer circuit 4 whose output switches from Hi to Lo level when the input of Lo level continues for 14 seconds.
6, a Hi cut circuit 47 (configured with a comparator or the like) whose output switches from Hi to Lo level when the output voltage 33 falls below a value corresponding to 290 ° C., and a timer circuit 4
AND of the output of the Hi-cut circuit 47 and the output of the
The circuit 48 and the transistor 14 form a sub system.

The voltage monitoring circuit 491 monitors the battery voltage and the stabilizing voltage, and sends a blinking instruction signal to the LED drive circuit 732 when the battery voltage drops below a first predetermined value.
Further, when the battery voltage further decreases and falls below the second predetermined value, a lighting instruction signal is sent to the LED drive circuit 732, and the input terminal (Hi) of the AND circuit 48 regardless of the output level of the Hi cut circuit 47. The level of the cut circuit 47 is set to Lo level.

The voltage monitoring circuit 492 monitors the battery voltage, and when the battery voltage falls below a third predetermined value which is further lower than the second predetermined value, the base potential of the transistor 14 becomes Lo level regardless of the output level of the AND circuit 48. I do.

The notifying means 5 includes a NOT circuit 52 to which the terminal voltage of the electromagnetic safety valve 1 is input, and an AND circuit 53 to which the output of the NOT circuit 52 and the output of the NOT circuit 23 are input.
A buzzer drive circuit 54 for intermittently switching the output to a Hi-Lo level when the output of the AND circuit 53 goes to a Hi level state, and a transistor 55 for driving the buzzer 51
And a piezoelectric buzzer 51.

The battery 6 is formed by connecting two single type manganese batteries in series, and is accommodated in a battery box 72.

The point of the M burner 11 (H burner 71, grill burner 78), the point of extinguishing fire, the fire extinguishing knob 74 (75, 7
6) When turning counterclockwise from the fire extinguishing position to the first setting position, the contact point of the micro switch 740 switches from the open state to the closed state, and when further turning to the second setting position, a hammer (not shown) collides with the piezoelectric element, The piezoelectric element generates a high voltage for igniting the burner, the M burner 11 becomes in a combustion state, and
The heating power of the M burner 11 can be adjusted within a predetermined angle range of the fire extinguishing knob 74.

When the point / fire extinguishing knob 74 is returned to the fire extinguishing position, the contact of the microswitch 740 returns to the open state, and the M burner 11 extinguishes.

Next, the operation of the gas stove A will be described. [Normal] When the user turns the point / fire extinguishing knob 74 counterclockwise from the fire extinguishing position to the first set position, the contact of the microswitch 740 switches from the open state to the closed state, and the operating power is supplied to each circuit. Supplied.

Because of the characteristics of the timer circuits 43 and 46, the transistors 13 and 14 are both conductive in the initial state, so that the electromagnetic safety valve 1 is opened.

Further, since the dot / fire extinguishing knob 74 is turned, a hammer (not shown) collides with the piezoelectric element, and the piezoelectric element generates a high voltage for igniting a burner and ignites the gas.
Starts burning.

The thermocouple 21 is burned by the combustion flame, the thermoelectromotive force becomes higher than the ignition detection level in a short time (within 7 seconds), the output of the ignition detection circuit 22 switches to the Lo level, and the output of the NOT circuit 23 becomes Hi. Switch to level.

Since both inputs of the AND circuit 42 become Hi level, the 7-second timer of the timer circuit 43 is reset, and the output of the timer circuit 43 maintains the Hi level state.

Similarly, the output of the ignition detection circuit 24 switches to the Hi level in a short time, and the output of the AND circuit 45 becomes H level.
The level is switched to the i level, the 14-second timer of the timer circuit 46 is reset, and the output of the timer circuit 46 maintains the Hi level state. Since both inputs of the AND circuit 48 maintain the Hi level, the output also maintains the Hi level state.

Since both the transistors 13 and 14 maintain the conducting state, the electromagnetic safety valve 1 maintains the valve open state.

The heating power of the M burner 11 is adjusted by rotating the spot / fire extinguishing knob 74.

[Ignition Failure] If a misfire occurs due to wind or the like at the time of ignition, the output of the ignition detection circuit 22 does not switch to the Lo level, the output of the NOT circuit 23 does not switch to the Hi level, and the output of the AND circuit 42 changes to the Lo level. Will be maintained.
When the 7-second timer of the timer 1 expires, the output of the timer circuit 43 switches to the Lo level, the transistor 13 is turned off, the electromagnetic safety valve 1 is closed, and the gas stops.

In this case, the electromagnetic safety valve 1 is closed, but the buzzer 51 does not sound.

If the main system of the safety monitoring means 4 using the timer 1 or the like fails and does not operate due to a failure, the electromagnetic safety valve 1 is closed by the sub-system of the safety monitoring means 4 using the timer 2 etc. Stop.

[Overheating] When the temperature of the oil put in the frying pan or the like becomes excessively high and becomes 265 ° C. or more, the output of the Hi cut circuit 41 switches from Hi → Lo level, and the output of the AND circuit 42 becomes Hi. → Switch to Lo level. The output of the timer circuit 43 switches from Hi to Lo level seven seconds after the overheating state, and the transistor 1
3 is turned off, the current supplied to the electromagnetic safety valve 1 is cut off, the gas stops, and the M burner 11 extinguishes automatically. If the main system does not operate due to a failure, the electromagnetic safety valve 1 is closed by the sub system of the safety monitoring means 4 and the gas stops.

When the current flowing through the electromagnetic safety valve 1 is cut off, the terminal voltage of the electromagnetic safety valve 1 switches to Lo level, and the output of the NOT circuit 52 switches from Lo to Hi level.

Also, even if the gas stops and the M burner 11 automatically extinguishes, the thermoelectromotive force sent out by the thermocouple 21 will maintain the ignition detection level or higher for about 15 to 50 seconds.
During that time, the output of the ignition detection circuit 22 maintains the Lo level, and the output of the NOT circuit 23 maintains the Hi level.

While the thermoelectromotive force transmitted by the thermocouple 21 maintains the ignition detection level or more, the input of the AND circuit 53 maintains the Hi level, and the buzzer drive circuit 54
However, the output is intermittently switched to the Hi-Lo level, and the buzzer 51 sounds. If the user returns the point / fire extinguishing knob 74 to the fire extinguishing position while the buzzer 51 is sounding, the contact of the microswitch 740 switches to the open state, and the supply of battery power to each circuit is cut off. Stops ringing.

When the thermocouple 21 cools and the transmitted thermoelectromotive force becomes lower than the ignition detection level, the output of the NOT circuit 23 switches to the Lo level, and the buzzer 51 stops sounding.

The advantages of the gas stove A of this embodiment are as follows. [A] If the temperature of the oil put in the cooking vessel 31 becomes higher than a predetermined temperature during the combustion of the M burner 11, the electromagnetic safety valve 1 closes after 7 seconds, the gas stops, and the M burner 11 The configuration is such that the buzzer 51 sounds while the thermoelectromotive force output from the thermocouple 21 is maintained at or above a predetermined value.

When the voltage of the battery 6 becomes lower than the second predetermined value or when the thermistor 3 is disconnected, the gas stops and the thermal electromotive force decreases as in the case of the high-cut of the oil temperature described above. While maintaining the predetermined value or more, the buzzer 51 sounds.

Therefore, the buzzer 51 is used for about 15 to 50 seconds.
Sounds, it is possible to inform the user that an abnormality requiring attention has occurred, and it is possible to prevent the battery 6 from being wasted.

Since the time from when combustion of the M burner 11 stops until the thermoelectromotive force becomes less than a predetermined value is used instead of a timer, a timer circuit for sounding the buzzer 51 for a predetermined time is omitted. Thus, the circuit configuration of the notification means 5 can be simplified.

[B] When the user returns the point / fire extinguishing knob 74 to the fire extinguishing position while the buzzer 51 is sounding, the sound of the buzzer 51 is stopped. Therefore, unnecessary sounding (sounding after returning to the fire extinguishing position) can be prevented, and the consumption of the battery 6 can be suppressed.

[C] Since the safety monitoring means 4 is duplicated, even if the main system fails and does not operate, the sub system can operate and stop the gas, which is safe.
Further, since the respective thresholds are shifted between the main system and the sub system, a problem that the sub system operates first does not occur.

In this embodiment, a gas stove is used as the combustion device. However, the configuration of the present invention may be applied to a small gas water heater.

In this embodiment, the rotary knob is used as the ignition knob. However, a push-push type operation button may be used. In this case, the second pressing operation is a fire extinguishing operation, and the fire extinguishing operation returns to the fire extinguishing position. And micro switch 740
Are open.

Further, the combustion device may be provided with an ignition button and a fire extinguisher button, respectively.

[Brief description of the drawings]

FIG. 1 is a top view and a front view of a gas stove according to one embodiment of the present invention.

FIG. 2 is an explanatory view of the structure of the gas stove.

FIG. 3 is a block diagram of the gas stove.

[Explanation of symbols]

 A gas stove (combustion device) 1 electromagnetic safety valve 3 thermistor (abnormality detection means) 4 safety monitoring means 5 notification means 6 battery 11 M burner (burner) 12 gas pipeline 74, 75, 76 points / fire extinguishing knob (operator)

Claims (2)

(57) [Claims] 1. An electromagnetic safety valve disposed in a gas pipe for supplying gas to a burner, a thermocouple facing the burner, and abnormality detecting means for detecting an abnormality that requires attention of a user. And when the abnormality detection unit detects an abnormality, a safety monitoring unit that closes the electromagnetic safety valve, and when the electromagnetic safety valve is closed by the safety monitoring unit,
A combustion device comprising: a notifying unit for notifying while the output of the thermocouple is maintained at a predetermined value or more, and a battery storing operating power. 2. The combustion apparatus according to claim 1, wherein, when the notification unit is performing the notification, the notification is stopped when an operating device for stopping the combustion of the burner is operated.