JP2001065869A - Range having fire extinguishment failure preventing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the detection of operation of a gas amount regulating lever without adding any different member to the gas flow rate regulating lever. SOLUTION: The flow rate of gas supplied to a gas burner is regulated by a gas flow rate regulating lever 23. A thermocouple 22 is arranged near the burner port of the gas burner while the presence of flame on the gas burner and the flow rate of gas supplied to the gas burner are judged based on the output voltage of the thermocouple 22. A timer 10a starts the counting operation of the same simultaneously with the ignition of the gas burner and when a change, overriding a set threshold value in a gas amount judging means 10c, is generated in the output voltage of the thermocouple 22, the timer 10a is re-triggered. When the limited time of the timer 10a is finished, a safety valve 11, inserted on the supplying route of fuel gas to the gas burner, is closed whereby the fire of the gas burner is extinguished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stove having a function of preventing forgetting to erase.

[0002]

2. Description of the Related Art Conventionally, gas stoves such as table stoves and built-in stoves have been provided with a temperature sensor for monitoring the temperature at the bottom of a pot in order to prevent overheating due to forgetting to turn off the stove. That is, while monitoring the change tendency of the temperature detected by the temperature sensor, the content of the cooking is determined, and the fire extinguishing temperature according to the content of the cooking is set. When the detected temperature reaches the extinguishing temperature, the gas burner is extinguished. is there.

[0003] This type of gas stove is desirable as a structure for preventing overheating and ensuring safety, but has the problem of a relatively high cost. For example, 2
In a gas stove having up to three gas burners, the present configuration does not employ the above configuration for all gas burners, but employs the above configuration only for one gas burner.

Therefore, as a configuration for adding a function to prevent forgetting to turn off a gas stove relatively inexpensively without using a temperature sensor, a configuration in which the ignition time of a gas burner is limited by a timer has been considered. That is, the gas burner is automatically extinguished when a certain time fixedly set by the timer elapses after the gas burner is ignited.

[0005]

By the way, in a gas stove, the gas flow rate (gas input) is adjustable and the heating power is adjustable, so that it is used for a long time with a small heating power like a stewed dish. In consideration of the above, the time limit of the timer is set to a relatively long time of about 2 hours so that the gas burner does not extinguish during the cooking. However, when the thermal power is large, the temperature rises quickly and the water content of the food evaporates quickly, so that the time required for the food to scorch and damage the pot is shortened. In other words, it is desirable to set a short time limit of the timer in order to enhance safety.

Therefore, it is conceivable that when a state in which no operation is performed on various operation units provided on the stove continues for a predetermined time, it is determined that the user has forgotten to extinguish the gas and the gas burner is automatically extinguished. In other words, when any operation is performed, the timer operation is restarted after the timer is reset, assuming that a person is nearby and monitoring the state of the fire. If such a configuration is adopted, the timer is retriggered every time an operation is performed, and the ignition time of the gas burner can be arbitrarily extended. Therefore, the time limit of the timer may be set short. Become.

Generally, operations on a gas stove include:
There are many operations of the gas amount adjustment lever that adjusts the gas amount supplied to the gas burner, but the current gas stove does not have a means for generating an electric signal on the gas amount adjustment lever, so when the gas amount adjustment lever is operated The timer cannot be reset. In order to solve this problem, it is conceivable to provide a switch or the like for detecting the operation of the gas amount adjusting lever. However, a separate member is added to the conventional gas stove, which causes a problem that the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to detect operation of a gas amount adjusting lever without adding another member to the gas amount adjusting lever. An object of the present invention is to provide a stove having a prevention function.

[0009]

According to a first aspect of the present invention, there is provided a gas amount adjusting lever for adjusting a gas amount of a fuel gas supplied to a gas burner, a thermocouple disposed near a flame port of the gas burner, and a thermocouple. Ignition detection means for detecting the presence or absence of ignition of the gas burner based on the output voltage of the pair, a timer for starting a timed operation from the time of ignition of the gas burner, and at least one of fire extinguishing of the gas burner and notification by the notification device when the timer expires. Control means, a gas amount determining means for determining the gas amount supplied to the gas burner based on the output voltage of the thermocouple, and the timer is reset when the gas amount detected by the gas amount determining means changes. Retrigger means for restarting the timed operation. According to this configuration, the amount of gas supplied to the gas burner is determined by the gas amount determination unit using the output voltage of the thermocouple provided to detect the presence or absence of ignition of the gas burner. It is possible to detect the operation of the gas amount adjusting lever without adding another member.

According to a second aspect of the present invention, in the first aspect of the present invention, the gas amount determining means determines the gas amount in a plurality of stages,
The retrigger means resets the timer and restarts the timed operation when the gas level changes.
According to this configuration, since the gas amount is detected in a stepwise manner, even if the output of the thermocouple fluctuates due to wind or the like, the possibility of erroneously detecting a change in the gas amount can be reduced.

According to a third aspect of the present invention, in the first or second aspect of the invention, the time limit of the timer is set shorter as the gas amount detected by the gas amount determining means is larger. According to this configuration, when the gas amount is large, the timer time-out period is shortened. Therefore, when the gas amount is large and the temperature rising speed is fast, the timer time-out period is set to be short so that overheating when forgetting to turn off is overheated. Can be suppressed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, fuel gas is supplied to a gas burner (not shown) through a safety valve 11 (see FIG. 1) which is an electromagnetic valve, and is burned by the gas burner. The safety valve 11 is linked with the instrument stopper 21, and when the instrument stopper 21 is operated, the safety valve 11 is opened. That is, a switch is provided on the appliance plug 21, and the controller 10 opens the safety valve 11 by opening and closing the switch in accordance with the operation of the appliance plug 21. An igniter 12 is attached to the gas burner, and a spark is generated from the igniter 12 for a certain period of time after the safety valve 11 is opened to ignite the fuel gas. The gas burner is provided with a thermocouple 22 adjacent to the flame port, and an output voltage of the thermocouple 22 is input to an ignition detection unit 10 b provided in the controller 10. Ignition detection means 1
In 0b, it is determined whether or not the fuel gas is burning based on the output voltage of the thermocouple 22. That is, when the specified output voltage cannot be obtained from the thermocouple 22 after the ignition of the gas burner, the ignition detection means 10b determines that the gas burner has extinguished for some reason and closes the safety valve 11 to avoid the danger of gas leakage.

A flow controller (not shown) is provided in a flow path between the safety valve 11 and the gas burner. In the flow controller, the flow rate of the fuel gas can be adjusted by operating a gas amount adjusting lever 23. . That is, the heating power can be adjusted by operating the gas amount adjusting lever 23. The output of the thermocouple 22 is also input to the gas amount determining means 10c provided in the controller 10, and the gas amount determining means 10c
Detects the amount of gas supplied to the gas burner according to the output voltage of the thermocouple 22 in two stages, large and small. That is, when the gas amount is large, the thermal power is large and the output voltage of the thermocouple 22 increases, and when the gas amount is small, the output voltage of the thermocouple 22 decreases. Therefore, an appropriate threshold value is set for the output voltage of the thermocouple 22. By doing so, the gas amount can be detected in two stages.

Incidentally, the controller 10 is provided with a timer 10a for limiting the burning time of the gas burner after the ignition of the gas burner in order to prevent forgetting to turn off the gas burner. The timer 10a includes a clock signal generating means for generating a clock signal and a counter for counting the clock signal. The timer 10a starts a timed operation when the gas burner is ignited by operating the instrument plug 21. Here, when a change in the gas amount is detected by the gas amount determining means 10c, the timer 10a is reset once by the retrigger means 10d provided in the controller 10, and thereafter the timed operation is restarted. That is, when a change in the gas amount is detected by the gas amount determination unit 10c, the timer 10a is retriggered. As described above, the output voltage of the thermocouple 22 is monitored by the gas amount discriminating means 10c, and when the gas amount changes to any of large or small, the retrigger means 10c.
Since the timer 10a is retriggered by d, it is possible to detect that the gas amount adjustment lever 23 has been operated and to trigger the timer 10a without providing a separate member for detecting the position of the gas amount adjustment lever 23. .

When the timer 10a expires, the controller 10a controls the safety valve 1 by the control means 10e.
Close 1 and extinguish the gas burner. That is, since the timer 10a is retriggered when the gas amount adjusting lever 23 is operated, the expiration of the time period of the timer 10a means that the gas amount adjusting lever 23 has not been operated within the time period. In such a case, the gas burner is extinguished because there is no person near the gas stove and there is a possibility that the gas burner may be forgotten to be extinguished. In addition,
Although not shown, a notifying means such as a buzzer may be provided, and the notifying means may notify when the gas burner is extinguished. Alternatively, only the notification by the notification means may be performed without extinguishing the gas burner.

In the illustrated example, the controller 1
A combustion lamp 13 is connected to 0 so that the combustion lamp 13 is turned on during combustion of the gas burner. The controller 10 shown is provided with a temperature control valve 14 inserted between the safety valve 11 and the gas burner to switch the cross-sectional area of the flow passage in two stages. That is, a temperature control valve 14 composed of an electromagnetic valve is inserted between the safety valve 11 and the gas burner, and a flow path bypassing the temperature control valve 14 is formed. The cross-sectional area of the flow path can be switched between two levels, large and small. This configuration makes it possible to adjust the heating power in two stages. The timing of opening and closing the temperature control valve 14 is controlled by the controller 10.
The controller 10 sets the target value indicated by the temperature controller provided on the temperature control operation board 24 as a target value, and performs feedback control of the temperature control valve 14 so that the temperature detected by the thermistor 25 contacting the bottom of the pan matches the target value.

As described above, in the present embodiment, in addition to the gas amount adjusting lever 23, the operation section of the appliance plug 21 and the temperature controller is provided.
0a is retriggered. When an operation unit for adjusting the time limit of the timer is provided, it is desirable that the timer 10a be retriggered by the operation of the operation unit. However, since the instrument stopper 21, the temperature controller, and the operation unit can all generate electric signals,
A signal can be directly input to the retrigger 10d of the controller 10.

However, as shown in FIG.
Is opened and the safety valve 11 is opened as shown in FIG. 2B, the timer 10a starts timed operation as shown in FIG. 2F. Here, when the temperature controller of the temperature control operation board is operated as shown in FIG. 2C, the timer 10a is retriggered as shown in FIG. 2F. When the gas amount adjusting lever is operated to change the gas amount as shown in FIG. 2D, the output voltage of the thermocouple 22 exceeds the threshold as shown in FIG. Timer 10a is retriggered. Fig. 2
As shown in (b), the safety valve 11 is automatically closed.

In the above example, the time limit of the timer 10a is fixed regardless of the amount of gas supplied to the gas burner. However, the time limit may be set shorter as the gas amount increases. In this case, when the gas amount is large and the thermal power is strong, the gas burner can be extinguished with a relatively short period of non-operation, so that the safety is higher.

[0020]

According to the first aspect of the present invention, there is provided a gas amount adjusting lever for adjusting a gas amount of a fuel gas supplied to a gas burner, a thermocouple disposed near a flame opening of the gas burner, and an output voltage of the thermocouple. Detection means for detecting the presence or absence of ignition of the gas burner, a timer for starting a timed operation from the time of ignition of the gas burner, and control means for extinguishing the gas burner and notifying by a notification device when the timer expires. And a gas amount discriminating means for discriminating the gas amount supplied to the gas burner based on the output voltage of the thermocouple; and resetting the timer and restarting the timed operation when the gas amount detected by the gas amount discriminating means changes. Retrigger means for detecting the presence or absence of ignition of the gas burner and supplied to the gas burner using an output voltage of a thermocouple provided. Since the amount of gas are determined by gas amount determining means, there is an advantage that it is possible to detect the operation amount of gas adjusting lever without adding another member to the gas amount adjustment lever.

According to a second aspect of the present invention, in the first aspect of the present invention, the gas amount determining means determines the gas amount in a plurality of stages, and the retrigger means resets the timer when the gas amount stage changes to perform the timed operation. Since the amount of gas is detected in a stepwise manner, there is an advantage that even if the output of the thermocouple fluctuates due to wind or the like, the possibility of erroneously detecting a change in the amount of gas can be reduced.

According to a third aspect of the present invention, in the first or second aspect of the invention, the time limit of the timer is set shorter as the gas amount detected by the gas amount determining means is larger, and the gas amount is larger. Sometimes the timer time is shortened, so when the gas volume is large and the temperature rises quickly, there is an advantage that by setting the timer time short, overheating when forgetting to turn off can be suppressed. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10a Timer 10b Ignition detecting means 10c Gas amount discriminating means 10d Retriggering means 10e Control means 22 Thermocouple 23 Gas amount adjusting lever

Claims (3)

[Claims] 1. A gas amount control lever for adjusting a gas amount of fuel gas supplied to a gas burner, a thermocouple disposed near a flame opening of the gas burner, and ignition of the gas burner based on an output voltage of the thermocouple. Ignition detection means for detecting the presence or absence, and a timer for starting a timed operation from the time of ignition of the gas burner,
Control means for extinguishing the gas burner and / or notifying by a notification device when the timer expires; gas quantity discriminating means for discriminating the gas quantity supplied to the gas burner based on the output voltage of the thermocouple; gas quantity discrimination Reheating means for resetting the timer and restarting the timed operation when the gas amount detected by the means has changed. 2. The gas amount determining means determines a gas amount in a plurality of stages, and the retrigger means resets the timer and restarts the timed operation when the gas amount stage changes. A stove having a function to prevent forgetting to erase as described in 1. 3. The stove having the function of preventing forgetting to erase according to claim 1, wherein the time limit of the timer is set shorter as the gas amount detected by the gas amount determining means is larger.