JP2000337637A - Safety device for gas heating cooking appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device of a gas heating cooking appliance to improve safety and convenience of use. SOLUTION: Based on a signal from a heating power sensor 13 outputting high heating power, intermediate thermal power, and low heating power signals according to the position of a fire regulation lever 11, a control means 4 sets a time, in which combustion of a gas burner 8 is brought into a stop, to the decrease in the time with the increase of a heating power. When the set time elapses, a drive current supplied to a solenoid 29 of a solenoid valve 14 is cut off and the solenoid valve 14 is closed and combustion is brought into a stop. Further, when a signal from the fire power sensor 13 is switched, the control means 4 varies a set time in response to the switching of the signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a gas cooking device such as a gas stove, an oven and a grill.

[0002]

2. Description of the Related Art Gas heating cooking appliances such as gas stoves used for cooking by burning fuel such as city gas are provided with safety devices for preventing forgetting to turn off.

[0003] For example, in cooking such as curry and stew, it is necessary to fry the ingredients over a high heat and then boil the food over a low heat for a long time. Sometimes do business. In such a case, there is a risk of forgetting to ignite the gas burner and leaving the gas burner in a burning state. The safety device shuts off the supply path of the gaseous fuel to the gas burner during combustion and automatically stops the combustion.

[0004]

In such a conventional safety device for preventing extinction, the time from ignition to the stop of combustion is set to 2 hours. There is a problem that the time until the automatic stop is too long may damage a pot or a kettle. In addition, a dish that needs to be boiled over low heat for 2 hours or more has a problem in that the flame is automatically extinguished 2 hours after ignition even during cooking, and the usability is poor.

[0005] It is an object of the present invention to provide a safety device for a gas heating cooking appliance with improved safety and ease of use.

[0006]

According to the first aspect of the present invention, there is provided a gas for shutting off the flame of a gas burner by interrupting the supply of fuel gas to the gas burner after a predetermined combustion time has elapsed after the ignition of the gas burner. In a safety device for a cooking appliance, a combustion time is set in response to a thermal power sensor and a detection output of the thermal power sensor, and when the set combustion time has elapsed, the supply of fuel gas to the gas burner is shut off, and the gas burner is turned off. And a control unit for stopping combustion of the gas heating cooking appliance.

According to the present invention, the thermal power sensor detects the displacement position of the operating member for adjusting the thermal power, detects the opening of the flow control valve, or determines the position of the needle of the flow control valve. Detect and derive a signal representing thermal power. Alternatively, a flow meter is provided in the fuel gas conduit to detect the fuel gas flow rate and derive a signal. That is, a signal corresponding to the thermal power of the gas burner is derived. The control means sets a predetermined combustion time in response to the detection output of the thermal power sensor, and when this combustion time has elapsed, shuts off the supply of the fuel gas to the gas burner and stops the combustion of the gas burner.

As described above, the time until the flame of the gas burner is extinguished is set in accordance with the thermal power. For example, in the case of a high heat, the set time is shortened to prevent the burning of a pot or the like, thereby improving the safety. On the other hand, in the case of low heat, increasing the set time can prevent the flame from being extinguished during the cooking of the stewed dish or the like, thereby improving safety and usability.

According to a second aspect of the present invention, in the configuration of the first aspect, the gas heating and cooking appliance has a plurality of gas burners, and the control means is provided in a plurality corresponding to each gas burner. The time until the supply of the fuel gas to each gas burner is cut off is set in response to the detection output of the thermal power sensor.

[0010] According to the present invention, the gas heating cooking appliance has a plurality of gas burners, and a thermal power sensor is individually provided for each gas burner, and the time until the combustion is individually stopped according to the thermal power is set. Therefore, usability is further improved.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the control means shortens the time until the supply of the fuel gas to the gas burner is shut off as the thermal power increases. Thus, it is characterized by being changed stepwise.

[0012] According to the present invention, the control means is configured to reduce the predetermined combustion time as the thermal power increases.
Because it is set in stages, for example, combustion is stopped early in the case of high heat, the pot and kettle are prevented from being damaged and safety is improved, and when cooking over low heat, the combustion time is set longer. The usability is improved without the fire going out during cooking.

According to a fourth aspect of the present invention, in the configuration of the first or second aspect, the control means shortens the time until the supply of the fuel gas to the gas burner is shut off as the thermal power increases. Thus, it is characterized by being continuously changed.

[0014] According to the present invention, the control means may reduce the predetermined combustion time as the thermal power increases.
Since it can be changed continuously, it is possible to set an optimal combustion time according to the thermal power.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram showing a configuration of a gas stove 2 provided with a safety device 1 for a gas heating cooking appliance according to an embodiment of the present invention, and FIG. FIG.

The gas stove 2, which is a gas heating cooking appliance, has a first stove 3, a second stove 5, a grill 6, and a control means 4. First stove 3 and second stove 5
Includes gas burners 8a, 8b, ignition / extinguishing buttons 9a, 9b, ignition / extinguishing switches 10a, 10b, and thermal power adjusting levers 11a, 1 as operating members for adjusting the thermal power.
1b, pan bottom temperature sensors 18a, 18b, burner head 2
7a, 27b, gotoku 43a, 43b, flow regulating valve 12,
A thermal power sensor 13, an electromagnetic valve 14, a flame detection sensor 15, a gas pipe 16, and a mixing pipe 17 are provided.

The grill 6 is provided with upper and lower gas burners (not shown), and an ignition / extinguishing button 9c, an ignition / extinguishing switch 10c, heat power adjusting levers 11c and 11d, and a flow adjusting valve 12 corresponding to the upper and lower gas burners, respectively. , Thermal power sensor 13, solenoid valve 14, flame detection sensor 15, gas pipe 16
And a mixing tube 17. Since the basic configurations of the first stove 3, the second stove 5 and the grill 6 are the same, only the configuration of the first stove 3 shown in FIG.

The thermal power sensor 13 is realized by, for example, three switches SW1, SW2 and SW3, and the ignition / extinguishing switch 10 is realized by a micro switch.

The fuel gas supplied to the gas burner 8 of the first stove 3 is first led to the inlet 23 of the solenoid valve 14. A fuel gas inlet 25 of the flow control valve 12 is connected to an outlet 24 of the solenoid valve 14 in a continuous manner. A gas pipe 16 and a mixing pipe 1 are provided between the fuel gas outlet 26 of the flow control valve 12 and the gas burner 8.
The fuel gas is mixed with the primary combustion air in the mixing pipe 17, and the fuel gas mixed with the primary combustion air is supplied to the burner head 27 of the gas burner 8.

The solenoid valve 14 is, as shown in FIG.
8, has an electromagnetic solenoid 29, a valve body 30, a spring 31, and a push rod 32, and is built in a housing 33 of the gas table stove 2. The front panel 34 of the housing 33 of the gas stove 2 has a push rod 32
Is provided with an ignition / extinguishing button 9 for pressing.

When the gas burner 8 of the first stove 3 is not burning, as shown in FIG.
The valve seat 28 of the valve box 28 is seated by the spring force of 1 to stop the supply of the fuel gas supplied from the inlet 23 of the solenoid valve 14 to the gas burner 8.

When the ignition / extinguishing button 9 is pressed as shown in FIG. 3 (2), the push rod 32 is pressed to one side in the axial direction (the right side in FIG. 3), and the valve body 30 is pushed through the push rod 32. The valve is displaced to one side in the axial direction against the spring force of the spring 31 and opens.

The fuel gas that has been opened and passed through the solenoid valve 14 passes through the flow control valve 12 and the gas pipe 16 and
At 7, it is mixed with air and guided to a gas burner 8. Also,
When the ignition / extinguishing button 9 is pressed, the ignition / extinguishing switch 10 is turned on, and the control means 4 is connected via the line L1.
Input the ignition / extinguishing signal to the. The control means 4 judges that the ignition is performed when the ignition / extinguishing signal is input in a state where the gas burner 8 is not burning, and the flame hole 3 of the burner head 27 is determined.
An electric spark is generated by a spark plug provided in the vicinity of 8, and the electric spark ignites the fuel gas emitted from the flame hole 38 of the burner head 27 and a flame rises.

When the gas burner 8 is ignited, a pilot flame 40 is generated. When the leading end 41 of the flame detection sensor 15 composed of a thermocouple contacts the pilot flame 40, the flame detection sensor 15 inputs a flame temperature signal to the control means 4 via the line L2. Based on the information of the flame temperature signal input from the flame detection sensor 15, the control means 4 determines that the ignition has occurred when the flame temperature is equal to or higher than a predetermined ignition reference temperature T1, for example, 1000 ° C. If less than, it is determined that ignition has not occurred.

When the control means 4 confirms that the gas burner 8 has been ignited, it supplies a drive current to the electromagnetic solenoid 29 located behind the valve body 30 via a line L3. Then, FIG.
As shown in (2), the iron piece 42 integrally attached to the valve body 30 is magnetically attracted to the electromagnetic solenoid 29, so that the valve body 3
0 is in a valve-open state against the spring force of the spring 31, and that state is maintained.

When the control means 4 determines that the ignition has not occurred, no drive current is supplied to the solenoid valve 14, so that the valve body 30 is kept closed by the spring force of the spring 31, and in the non-ignition state. The supply of the fuel gas to the gas burner 8 is prevented.

When the ignition / extinguishing button 9 is pressed while the gas burner 8 is burning and an ignition / extinguishing signal is input from the ignition / extinguishing switch 10, the control means 4 determines that the fire is extinguished, and the electromagnetic solenoid The drive current supplied to the fuel cell 29 is cut off, the supply of fuel gas is stopped, and the fire is extinguished.

When the flame is extinguished due to spills or wind during the combustion of the gas burner 8, the control means 4 cuts off the drive current supplied to the electromagnetic solenoid 29 based on the flame temperature signal output from the flame detection sensor 15, and cuts off the gas. The supply of fuel gas to the tank.

The first stove 3 is provided with a pan bottom temperature sensor 18 composed of a thermistor. When the pan 44 is placed on the go 43, the pan bottom temperature sensor 18 is placed on the bottom of the pan 44 by the spring force of the spring 45. The bottom surface temperature of the pan 44 is detected by the contact, and the pan bottom temperature signal is input to the control means 4 via the line L4.

Based on the pan bottom temperature signal from the pan bottom temperature sensor 18, when the bottom surface temperature of the pan 44 starts to rise from a state where it is maintained at around 100 ° C. and reaches 140 ° C., the control means 4 completely evaporates water from the pan 44. Then, the drive current supplied to the electromagnetic solenoid 29 of the electromagnetic valve 14 is shut off to close the valve, and the supply of the fuel gas to the gas burner 8 is stopped. This prevents the pan 44 from being scorched due to the boiling out.

When the temperature of the bottom of the pan 44 reaches 250 ° C., the control means 4 shuts off the drive current supplied to the solenoid 29 of the solenoid valve 14 and closes it. Stop supplying the fuel gas. This prevents the tempura oil from reaching a spontaneous ignition temperature of 350 ° C. and burning out the tempura oil when cooking fried food such as tempura.

The gas table stove 2 is provided with a seismic sensor 7. When the seismic sensor 7 detects a shaking, an earthquake signal is input to the control means 4 via the line L5, 4 shuts off the drive current supplied to the electromagnetic solenoid 29 of the electromagnetic valve 14 in response to the earthquake signal, closes the valve, and stops the supply of fuel gas to the gas burner 8.

A heating power adjusting lever 11 which is an operation member for adjusting the heating power is linked to a flow control valve 12, and when the heating power adjusting lever 11 is turned to the left, the needle of the flow control valve 12 is linked to this. The part 46 moves downward, the amount of fuel gas supplied to the gas burner 8 decreases, and the thermal power decreases. When the heating power control lever 11 is rotated to the right, the needle portion 46 of the flow control valve 12 moves upward in conjunction with this, the amount of fuel gas supplied to the gas burner 8 increases, and the heating power increases.

The heating power control lever 11 has a click point, by which the flame of the gas burner 8 can be positioned at high, medium and low heat.

The thermal power sensor 13 has three switches SW1,
SW2 and SW3, which are arranged at equal intervals in the circumferential direction with respect to the center of rotation of the heating power control lever 11, and are arranged in order from the left side when viewed from the front 34 of the gas table stove 2.

When the heating power control lever 11 is at the left low-fire position, the switches SW1, SW2 and SW3 output a low-fire signal which is ON, OFF and OFF, respectively. Judge.

When the heat adjusting lever 11 is at the center,
Switches SW1, SW2 and SW3 are off,
The control unit 4 inputs a medium fire signal that is ON or OFF to the control unit 4, and at this time, the control unit 4 determines that a medium fire has occurred.

When the heating power control lever 11 is on the right side,
Switches SW1, SW2 and SW3 are off,
The control unit 4 outputs an off-fire signal and an on-fire signal.

Instead of the thermal power sensor 13 for detecting the displacement of the thermal power control lever 11, the thermal power sensor for detecting the opening of the flow control valve 12 or the thermal power for detecting the position of the needle 46 of the flow control valve 12 A sensor may be applied. Further, a flow meter may be provided in the gas pipe 16 on the downstream side of the flow control valve 12, and a thermal power sensor for detecting the fuel gas flow rate based on the detection output may be provided.

FIG. 4 is a block diagram showing the configuration of the safety device 1 for preventing erasure. The safety device 1 includes an ignition / extinguishing switch 10 and switches SW1 and S
W2 and SW3, control means 4, a timer 22 built in control means 4, and electromagnetic valve 14 are included. The control means 4 controls the solenoid valve 14 based on the ignition / extinguishing signal output from the ignition / extinguishing switch 10, the strong fire signal, the medium fire signal, and the low fire signal output from the thermal power sensor 13.
And various information is displayed on the display window 47.

In the display window 47, the consumption of a dry battery, which is the power source of the gas table stove 2, is displayed by blinking a lamp.

When the ignition / extinguishing button 9 is pressed, an ignition / extinguishing signal is sent from the ignition / extinguishing switch 10 to the control means 4.
, And one of the heat signals representing the high heat signal, the medium heat signal and the low heat signal is input to the control means 4 from the heat sensor 13. In response to the ignition / extinguishing signal and the heating power signal, the control means 4 determines a change in the flow rate of the fuel gas, such as ignition at high heat or a change from high to low heat. In response to the heat signal, the control means 4 sets a predetermined combustion time,
The set time is measured by the timer 22, and when a predetermined combustion time has elapsed, the drive current supplied to the solenoid valve 14 is shut off to close the valve, and the supply of the fuel gas to the gas burner 8 is stopped.

Next, control of the safety device 1 for preventing forgetting to erase by the control means 4 will be described with reference to the flowchart shown in FIG.

In step s1, when the ignition / extinguishing button 9 is pressed to ignite the gas burner 8 and an ignition signal is inputted from the ignition / extinguishing switch 10 to the control means 4,
The control of the safety device 1 for preventing forgetting to turn off is started.

In step s2, it is determined whether or not the signal input from the thermal power sensor 13 is a strong fire signal. If the signal is a strong fire signal, the time until the combustion of the gas burner 8 is stopped in step s3 is one hour. After setting, the timer 22 starts to count the set time of one hour.

If a new signal is not input from the thermal power sensor 13 during the counting by the timer 22 in step s4, it is determined that thermal power adjustment has not been performed, and the process proceeds to step s5.
When the set time elapses and the timer 22 finishes counting,
The drive current supplied to the electromagnetic valve 14 is cut off by the control means 4, the electromagnetic valve 14 is closed, and the supply of the fuel gas supplied to the gas burner 8 is stopped.

If it is determined in step s2 that the high heat signal has not been input, the process proceeds to step s7, where it is determined whether or not the signal input from the thermal power sensor 13 is a medium heat signal. In step s8, the time until the combustion of the gas burner 8 is stopped is set to 2 hours, and the timer 2
2 starts counting the set time of 2 hours, and steps s4 to s6 are executed in the same manner as described above.

If the medium fire signal has not been input in step s7, the process proceeds to step s9, in which the signal input from the thermal power sensor 13 is determined to be a low heat signal, and the time until the combustion of the gas burner 8 is stopped in step s9. Is set to 3 hours, the timer 22 starts counting the set time of 3 hours, and steps s4 to s6 are executed as described above.

When the heating power is adjusted in step s4, the process returns to step s2, and the control in step s2 and thereafter is performed again.

FIG. 6 shows a safety device 1 according to the present invention.
7 is a graph showing the relationship between the remaining time of the timer 22 and the elapsed cooking time when cooking is performed using the gas table stove 2 provided with. Cooking requires a long time to cook curry and stew, for example.
Stir on high heat for 0 minutes, then boil for 1 hour on medium heat, then boil for 3 hours on low heat.

At time t0, the user of the gas table stove 2 presses the ignition / extinguishing button 9 to operate the gas burner 8
, And the heat power adjusting lever 10 is operated to adjust the heat to high. Then, the timer 22 is set to one hour, and starts measuring time.

In the safety device 1 according to the present invention, when the fire power is high, the fire is extinguished earlier than in the conventional safety device for preventing extinguishment. Thus, scorching of the pan 44 and the frying pan can be reliably prevented.

After frying for 30 minutes on high heat, the heat is adjusted to medium heat at time t1. At this time, a medium fire signal is input from the thermal power sensor 13 to the control means 4, and based on the information of the medium fire signal, the remaining time 30 minutes of the timer 22 is reset, the time is rewritten to 2 hours, and Start timing.

When the low heat is adjusted at time t3 after the medium heat for one hour, the low heat signal is input from the heat sensor 13 to the control means 4, and the remaining time is one hour based on the information of the low heat signal. Is reset and the time is rewritten to 3 hours to start the time measurement.

In the conventional safety device for preventing fire extinguishing, the fire was extinguished 2 hours after the ignition regardless of the adjustment of the heating power during the cooking. Therefore, automatically at time t4, that is, 2 hours after the first ignition. Although the fire was extinguished and the usability was poor, in the gas table stove 2 provided with the safety device 1 of the present invention, the set time of the timer 22 is rewritten each time the heat power is adjusted, so that the fire is automatically extinguished during cooking. There is almost no such thing, and usability is improved.

In the case where the conventional gas table stove is used, even if the fire is once extinguished at time t3 and then ignited and then started to be boiled again over a low heat, the gas is again heated at time t5 two hours after time t3. Automatically extinguished.

At time t6, the predetermined combustion time set by the control means 4 at time t3, ie, three hours, has elapsed, so the control means 4 cuts off the drive current supplied to the solenoid valve 14 and The valve 14 is closed, and the supply of fuel gas to the gas burner 8 is stopped to extinguish.

After the combustion is stopped at time t6, the ignition /
When the ignition button 9 is pressed to ignite and an ignition signal is input from the ignition / extinguishing switch 10 to the control means 4, the control of the safety device 1 is started again.

Such a safety device 1 for preventing the user from forgetting to erase is the first device.
It is provided not only on the stove 3 but also on the second stove 5 and the grill 6, and each is individually controlled.

In the present embodiment, the heating power has three stages of low heat, medium heat and high heat, but as another embodiment of the present invention,
The switching of the heating power may be performed in two, four, or more stages, and the switching of the set time until the combustion is stopped may be performed in two, four, or more stages. For example, the heating power is switched in four stages of high heat, medium high heat, medium low heat and low heat, and the set time is set to 30 for each of them.
Minutes, 1 hour, 2 hours and 4 hours.

FIG. 7 is a graph showing the relationship between the thermal power of the safety device for preventing erasure and the setting time of the timer 22 according to another embodiment of the present invention. This embodiment is similar to the above-described embodiment, and the corresponding portions are denoted by the same reference characters and description thereof will not be repeated. In the above-described embodiment, the set time of the timer 22 is set discontinuously in multiple steps according to the heating power. However, in the present embodiment, the setting time of the timer 22 is set continuously according to the heating power. I do. Therefore, the thermal power sensor according to the present embodiment detects the amount of angular displacement of the thermal power adjustment lever 11 and outputs a thermal power signal that continuously changes in accordance with the angular displacement. In response, as shown in FIG. 7, the timer 22 is set so that the set time becomes shorter as the thermal power becomes larger. By continuously setting the timer 22 in this manner, the control means 4 can set an optimum combustion stop time.

[0062]

According to the first aspect of the present invention, the time until the gas burner is extinguished is set in accordance with the thermal power. For example, in the case of a strong fire, the set time is shortened to reduce the safety. In the case of low heat, by increasing the set time, it is possible to prevent the flame from being extinguished during a stewed dish or the like, thereby improving usability.

According to the present invention, the combustion stop time can be individually set for a plurality of gas burners.

According to the third aspect of the present invention, it is possible to prevent scorching of the pot during high-heat cooking and to prevent the fire from being automatically extinguished during long-time stew cooking, thereby improving safety and usability. .

According to the present invention, by setting the timer time continuously, it is possible to set the optimum combustion stop time.

[Brief description of the drawings]

FIG. 1 is a view showing a configuration of a first stove 3 of a gas table stove 2;

FIG. 2 is a perspective view of the gas table stove 2;

FIG. 3A is a sectional view showing a closed state of the solenoid valve 14, and FIG. 3B is a sectional view showing an opened state of the solenoid valve 14.

FIG. 4 is a block diagram showing a configuration of the safety device 1.

FIG. 5 is a flowchart illustrating a control operation by a control unit 4 of the safety device 1.

FIG. 6 is a timing chart showing an example of a timer remaining time of a timer 22.

FIG. 7 is a graph showing a relationship between a thermal power and a timer set time according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Safety device 2 Gas stove 3 First stove 4 Control means 5 Second stove 6 Grill 8 Gas burner 9 Ignition / extinguishing button 10 Ignition / extinguishing switch 11 Thermal control lever 12 Flow control valve 13 Thermal sensor 14 Solenoid valve 15 Flame detection sensor 16 Gas pipe 17 Mixing pipe 18 Pot bottom temperature sensor 22 Timer 29 Electromagnetic solenoid

Claims (4)

[Claims] 1. A safety device for a gas heating cooking appliance which shuts off the supply of fuel gas to a gas burner after a predetermined combustion time has elapsed after the ignition of the gas burner and extinguishes the flame of the gas burner. Control means for setting a combustion time in response to a detection output of the sensor, and when the set combustion time has elapsed, shutting off the supply of fuel gas to the gas burner and stopping the combustion of the gas burner. Safety device for gas heating cooking equipment. 2. The gas heating and cooking appliance has a plurality of gas burners, and the control means responds to detection outputs of a plurality of thermal power sensors provided individually for each gas burner, and controls each gas burner. The safety device for a gas heating appliance according to claim 1, wherein a time until the supply of the fuel gas is cut off is set. 3. The control device according to claim 1, wherein the control unit changes the time until the supply of the fuel gas to the gas burner is stopped in a stepwise manner so as to become shorter as the thermal power becomes larger. 3. The safety device for a gas heating appliance according to 2. 4. The control unit according to claim 1, wherein the control unit changes the time until the supply of the fuel gas to the gas burner is cut off so as to become shorter as the thermal power becomes larger. 3. The safety device for a gas heating appliance according to 2.