JP2001065868A - Cooking stove having fire extinguishment failure preventing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the stopping of heating on the way of cooking even while securing safety against overheating. SOLUTION: A stove is provided with a gas amount regulating lever position detecting unit 23 for detecting the position of a gas amount regulating lever for regulating the amount of fuel gas supplied to a gas burner. The amount of gas for supplying to the gas burner is detected in two stages based on the position of the gas amount regulating lever position detecting unit 23 and when the amount of gas is large, a timer 31a having a short time limit is employed to count a limited time while another timer 31b having a long time limit is employed to count the limited time when the amount of gas is small. When the limit time of either one of the timers 31a, 31b is finished, a safety valve 11 is closed to extinguish the fire of the gas burner.

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 amount (gas input) is adjustable and the heating power is adjustable. When the heating power is large, the temperature rises quickly, and when the heating power is small, the temperature rises. Slows down. In other words, the greater the heating power, the faster the moisture of the food is evaporated, and the shorter the time required for the food to be scorched and the problem of damaging the pan to occur. Setting a short time limit on the timer can prevent this kind of problem when the heat is large and increase the safety, but a short time limit with the timer will reduce the heat and use it for a long time like a stewed dish In such a case, the gas burner extinguishes during cooking, which is inconvenient.

The present invention has been made in view of the above circumstances, and has as its object to realize a function for preventing forgetting to be erased relatively inexpensively by using a timer to ensure the safety against overheating and to cook stewed dishes. An object of the present invention is to provide a stove having a function of preventing forgetting to turn off without stopping heating during cooking.

[0007]

According to a first aspect of the present invention, there is provided a timer for limiting the ignition time of a gas burner and performing at least one of extinguishing of the gas burner and notification by a notification means at the end of the time limit, and a gas amount supplied to the gas burner. And a gas amount detecting means for detecting the time. The time limit time by the timer is shortened as the gas amount detected by the gas amount detecting means increases. According to this configuration, when the gas amount is large and the temperature rising speed is large, overheating can be suppressed by shortening the timer time period, and when the gas amount is small and the temperature rising speed is small, the timer time period is limited. By lengthening the length, it is possible to prevent the inconvenience of extinguishing the gas burner in the middle of a stewed dish.

According to a second aspect of the present invention, in the first aspect of the present invention, the gas amount detecting means detects a position of a gas amount adjusting lever for adjusting an amount of gas supplied to the gas burner. Part.
In this configuration, since the position of the gas amount adjusting lever is associated with the gas amount, it can be accurately associated with the supplied gas amount.

According to a third aspect of the present invention, in the first aspect of the present invention, a thermocouple disposed near a flame opening of the gas burner is used as the gas amount detecting means for detecting whether or not the gas burner is ignited. . In this configuration, the amount of gas is detected by diverting a thermocouple that detects the presence or absence of ignition of the gas burner, so that the amount of gas can be detected without adding another member.

According to a fourth aspect of the present invention, in the first aspect, a temperature sensor for detecting a temperature of the cooking vessel heated by the gas burner, a temperature controller for setting a target temperature of the cooking vessel, and supply to the gas burner. A temperature control valve that adjusts the amount of gas to be controlled, and a controller that performs feedback control of the temperature control valve so as to maintain the temperature detected by the temperature sensor at the target temperature, and associates control information of the temperature control valve with the controller with the gas amount. And the controller is used as the gas amount detecting means. According to this configuration, since the temperature adjustment function is used for detecting the gas amount,
Higher security can be ensured.

According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, the gas amount detecting means includes a plurality of timers for discriminating the gas amount in a plurality of stages and for respectively time limiting each stage. When the time limit of one of the timers expires, at least one of extinguishing of the gas burner and notification by the notification means is performed. This configuration makes it possible to set a time period that almost matches the rise in temperature of the surrounding walls and the like, and is suitable for suppressing overheating of the walls and the like.

According to a sixth aspect of the present invention, in the first to fourth aspects of the present invention, the gas amount detecting means determines the gas amount in a plurality of stages, and the timer measures the timed speed for each stage of the gas amount. It is configured to switch.
With this configuration, it is possible to perform control such that the total amount of gas used becomes equal to or less than a predetermined value.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) In this embodiment, a gas stove for burning fuel gas will be described. That is, the fuel gas is supplied to a gas burner (not shown) through the safety valve 11, which is an electromagnetic valve, and is burned by the gas burner. The safety valve 11 is linked to the instrument tap 21 and the instrument tap 2
Operation of 1 causes the safety valve 11 to open. 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 the controller 10 determines whether the fuel gas is burning based on the output voltage of the thermocouple 22. That is, when the controller 10 cannot obtain the specified output voltage from the thermocouple 22 after the ignition of the gas burner, the controller 10 determines that the gas burner has extinguished for some reason and closes the safety valve 11 to avoid the danger of gas leakage. ing.

A flow controller (not shown) is provided in a flow path between the safety valve 11 and the gas burner, and the flow rate of the fuel gas can be adjusted by operating a gas amount adjusting lever (not shown). . That is, the heating power can be adjusted by operating the gas amount adjusting lever. In the present embodiment, an electric signal corresponding to the gas amount supplied to the gas burner is provided to the controller 10 based on the operation amount of the gas amount adjusting lever, and therefore, the gas amount adjusting device detects the position of the gas amount adjusting lever. The lever position detector 23 is provided as a gas amount detector. As the gas amount adjusting lever position detecting unit 23, a micro switch that detects the position of the gas amount adjusting lever is used when detecting the gas amount in two or three steps, and when the gas amount is detected in multiple steps. Use a variable resistor or encoder linked to the gas amount adjustment lever.

The controller 10 has two timers 3 for limiting the burning time of the gas burner after ignition of the gas burner in order to prevent forgetting to turn off the gas burner.
1a and 31b. Each of the timers 31a and 31b includes a clock signal generating means for generating a clock signal and a counter for counting the clock signal.
The clock signal of each of the timers 31a and 31b is different, and therefore, the time limit of each of the timers 31a and 31b is different. The timers 31a and 31b are reset when the gas burner is extinguished.

In the present embodiment, the gas amount is determined in two stages, large and small, based on the output of the gas amount adjusting lever position detecting unit 23. When the gas amount is large, the clock signal is counted by the timer 31a having a short time limit, and the gas amount is determined. When the number is small, the clock signal is counted by the timer 31b having a long time limit. Each of the timers 31a and 31b limits the period of the magnitude of the gas amount (gas input). Therefore, FIG.
When the instrument plug 21 is opened as shown in FIG. 2A and the safety valve 11 is opened as shown in FIG. 2B, the gas amount selected by the gas amount adjusting lever is small as shown in FIG. Sometimes, only the timer 31b operates as shown in FIG. 2 (f), and counting by the counter is performed. During this time, FIG.
As shown in (e), the counting by the counter is stopped in the timer 31a. On the other hand, when the gas amount is adjusted to increase the gas amount, only the timer 31a operates as shown in FIG. 2E, and the timer 31b stops as shown in FIG. 2F.

As described above, the two timers 31a and 31b operate alternately according to the magnitude of the gas amount, and the counter finally counts up in one of the timers 31a and 31b. Timer 31a,
When the time of 31b has expired (the timer 31a has expired in the figure), the safety valve 11 is automatically closed.

As described above, the time until the time-up (time limit time) is changed according to the gas amount. Therefore, when the gas amount is large, the time limit is shortened to prevent overheating,
When the gas amount is small, the time limit can be extended to prevent fire extinguishing during cooking such as stewed cooking.

In the above-described example, the gas amount is set to two levels and the timers 31a and 31b are set to two steps. However, three or more steps are possible. Further, in the above-described example, the position of the gas amount adjusting lever is associated with the gas amount, but the thermocouple 22 that detects the disappearance of the gas burner or the like corresponds to the gas amount (gas input) as shown in FIG. Since the output voltage is generated, the gas amount may be determined using the output voltage of the thermocouple 22. That is, if an appropriate threshold value is set for the output voltage of the thermocouple 22, FIG.
As shown in (d), the amount of gas can be determined in two levels, large and small, using the output voltage of the thermocouple 22. That is, the thermocouple 22 functions as gas amount detecting means.

In the above-described configuration, each timer 31
Although the frequency of the clock signal is made different in a and 31b, the time period may be made different by making the frequency of the clock signal equal and making the count-up value of the counter different. In the above example, the gas burner is extinguished at the end of the time period.However, a notifying unit such as a buzzer (not shown) is provided to notify the end of the time period, or the gas burner is not extinguished. Only the notification by the notification means may be performed.

(Second Embodiment) In the first embodiment, the gas amount is determined in two stages, and the timers 31a and 31b are used to perform time limits according to each stage. In the embodiment, as shown in FIG.
The frequency of the clock signal counted by the counter is switched according to the gas amount. That is, as in the first embodiment, if the gas amount is determined in two stages, the frequency of the clock signal is reduced when the gas amount is small, and the frequency of the clock signal is increased when the gas amount is large. . Such an operation makes it possible to change the time until the count value of the counter reaches the count-up value (that is, the counting speed) depending on the magnitude of the gas amount.

Therefore, in this embodiment, FIG.
When the safety valve 11 is opened as shown in FIG. 5 (b) and the gas amount selected by the gas amount adjusting lever is small as shown in FIG. As shown in 5 (e), the rate of increase in the count value of the counter in the timer 31 decreases, and when the gas amount increases, the rate of increase in the count value of the counter in the timer 31 increases. As a result, the timer 31 times out in a relatively short time when the gas amount increases, and the timer 31 times up in a relatively long time when the gas amount decreases. When the timer 31 times out, the safety valve 11 is automatically closed as shown in FIG.

Other configurations and operations are the same as those of the first embodiment. However, in the first embodiment, the safety valve 11 is closed when the gas amount reaches a predetermined value in either the large or small gas amount, whereas in the present embodiment, the safety valve 11 is determined by the sum of the large and small gas amounts. Will be closed.

In the above example, the gas amount is set to two levels and the time limit of the timer 31 is set to two levels. However, three or more levels are possible. In the above example, the position of the gas amount adjusting lever is associated with the gas amount, but the gas amount may be determined using the output voltage of the thermocouple 22 as in the first embodiment. That is, an appropriate threshold value is set for the output voltage of the thermocouple 22, and the amount of gas can be determined in two levels, using the output voltage of the thermocouple 22, as shown in FIG.

(Third Embodiment) In each of the above embodiments, the gas amount is determined by using the position of the gas amount adjusting lever or the output voltage of the thermocouple 22, but the target value of the temperature at the bottom of the pan is determined. In a stove having a function of keeping the temperature of the bottom of the pot substantially constant by giving it, the gas amount is determined using the following configuration.

In this type of stove, as shown in FIG.
A temperature control valve 13 is provided between the safety valve 11 and the gas burner so that the cross-sectional area of the flow path can be switched in two stages. That is, a temperature control valve 13 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 13 is formed. The cross-sectional area of the flow path can be switched between two levels, large and small. With this configuration, the gas amount can be adjusted in two stages.
The opening and closing timing of the temperature control valve 13 is controlled by the controller 10. The controller 10 sets the indicated value from the temperature control operation device 24 as a target value, and adjusts the temperature detected by the thermistor 25 as a temperature sensor that contacts the bottom of the pot, which is a cooking container, and detects the temperature of the bottom of the pot so as to match the target value. Temperature control valve 13
Is feedback controlled.

In such a configuration, the controller 10
Controls the temperature control valve 13 so that the controller 10 can know the amount of gas supplied to the gas burner. That is, the controller 10 functions as gas amount detection means. Therefore, if the timer is controlled by associating the opening / closing instruction from the controller 10 to the temperature control valve 13 with the gas amount, it is possible to control the time limit according to the gas amount. Here, as the timer, a configuration using two timers 31a and 31b having different time limits as in the first embodiment is shown, but as in the second embodiment, one timer is used. A configuration for switching the time limit may be adopted. Other configurations and operations are the same as those of the first embodiment.

[0028]

According to the first aspect of the present invention, there is provided a timer for limiting the ignition time of the gas burner and performing at least one of extinguishing of the gas burner and notification by the notification means at the end of the time limit, and a gas for detecting the amount of gas supplied to the gas burner. It is provided with an amount detection means, the shorter the time limit time by the timer as the gas amount detected by the gas amount detection means is larger,
When the amount of gas is large and the temperature rise speed is high, overheating can be suppressed by shortening the timer time period, and when the gas amount is small and the temperature rise speed is small, the timer time period is lengthened and stewed. There is an advantage that the inconvenience of extinguishing the gas burner during cooking or the like can be prevented.

According to a second aspect of the present invention, in the first aspect of the present invention, the gas amount detecting means includes a gas amount adjusting lever position detecting portion for detecting a position of a gas amount adjusting lever for adjusting an amount of gas supplied to the gas burner. Since the position of the gas amount adjusting lever is associated with the gas amount, there is an advantage that it can be accurately associated with the supplied gas amount.

According to a third aspect of the present invention, in the first aspect of the present invention, a thermocouple disposed near a flame opening of the gas burner is used as the gas amount detecting means for detecting whether the gas burner is ignited. Since the gas amount is detected by using a thermocouple for detecting the presence or absence of ignition of the gas burner, there is an advantage that the gas amount can be detected without adding a separate member.

According to a fourth aspect of the present invention, in the first aspect, a temperature sensor for detecting a temperature of the cooking vessel heated by the gas burner, a temperature controller for setting a target temperature of the cooking vessel, and supply to the gas burner. A temperature control valve that controls the amount of gas to be controlled, and a controller that performs feedback control of the temperature control valve so as to maintain the temperature detected by the temperature sensor at the target temperature, and associates control information of the temperature control valve with the controller with the gas amount. Since the controller is used as the gas amount detecting means and the temperature control function is used for detecting the gas amount, there is an advantage that higher safety can be secured.

According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, the gas amount detecting means includes a plurality of timers for discriminating the gas amount in a plurality of stages and time-limiting each stage. When the timer's time limit expires, at least one of extinguishing the gas burner and notification by the notification means is performed, and it is possible to set a time limit that almost matches the temperature rise of the surrounding walls and the like. Yes, suitable for suppressing overheating of walls and the like.

According to a sixth aspect of the present invention, in the first to fourth aspects of the present invention, the gas amount detecting means determines the gas amount in a plurality of stages, and the timer switches the timing speed for each stage of the gas amount. This makes it possible to perform control such that the total amount of gas used becomes equal to or less than a predetermined value.

[Brief description of the drawings]

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

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

FIG. 3 is an explanatory diagram of the operation of the thermocouple used in the first embodiment.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

FIG. 5 is an operation explanatory view of the above.

FIG. 6 is a block diagram showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Controller 13 Temperature control valve 31 Timer 31a, 31b Timer 22 Thermocouple 23 Gas amount adjustment lever position detection part 24 Temperature control operation device 25 Thermistor

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shinichi Hagiwara 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (72) Inventor Akihiro Tominaga 1-1-52, Oka, Minami-shi, Minato-ku, Osaka-shi (72) Inventor Masahiko Yagi 1-1-52, Minami-shioka, Minato-ku, Osaka-shi Harman-uchi (72) Inventor Toshiyuki Mizushima 1-1-52, Minami-shioka, Minato-ku, Osaka-shi Harman-uchi (72) ) Inventor Yoichiro Moriya 1-152 Oka, Minami-shi, Minato-ku, Osaka

Claims (6)

[Claims] 1. A timer for limiting the ignition time of a gas burner and performing at least one of extinguishing of the gas burner and notification by a notification means at the end of the time limit, and gas amount detection means for detecting an amount of gas supplied to the gas burner, A stove having a function to prevent forgetting to turn off, characterized in that the time period set by the timer is shortened as the gas amount detected by the gas amount detecting means is larger. 2. A gas amount adjusting lever position detecting unit for detecting a position of a gas amount adjusting lever for adjusting an amount of gas supplied to the gas burner. A stove with a function to prevent forgetting to turn off. 3. The function for preventing forgetting to extinguish according to claim 1, wherein said gas amount detecting means is a thermocouple arranged near a flame opening of the gas burner for detecting presence / absence of ignition of the gas burner. Have a stove. 4. A temperature sensor for detecting a temperature of a cooking vessel heated by a gas burner, a temperature control device for setting a target temperature of the cooking vessel, a temperature control valve for controlling an amount of gas supplied to the gas burner, and a temperature. A controller for feedback-controlling the temperature control valve so as to maintain the temperature detected by the sensor at the target temperature, and using the controller as the gas amount detection means by associating control information of the temperature control valve with the gas amount with the controller. The stove having the function of preventing forgetting to erase according to claim 1, characterized in that: 5. The gas amount detecting means includes a plurality of timers for discriminating the gas amount in a plurality of stages, and each of the timers has a time limit for each of the stages. The stove having a function to prevent forgetting to erase according to any one of claims 1 to 4, wherein at least one of notification by means is performed. 6. The apparatus according to claim 1, wherein said gas amount detecting means determines said gas amount in a plurality of stages, and said timer is configured to switch a time counting speed for each stage of the gas amount. A stove having the function of preventing forgetting to erase according to claim 4.