JPH0474612B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature control device for a gas stove.

Conventional technology This type of conventional gas stove turns on and off the combustion of the burner by opening and closing an on-off valve installed in the gas passage.
The area of the gas passage is controlled by using a proportional solenoid valve that maintains a preset temperature, or adjusts the amount of gas by controlling the power supply depending on the deviation between the set temperature and the actually detected temperature, and liquid expansion. You can adjust the temperature by reducing the firepower of the main burner using a control valve that adjusts the amount of gas depending on changes in the amount of gas, or you can use a manual knob to adjust the heat by adjusting the amount of gas and reduce the heat to reheat or keep food warm. I was gone.

Problems to be Solved by the Invention However, with the above configuration, the main burner
The on-off type that maintains the set temperature frequently repeats lighting and extinguishing at the set temperature, which is undesirable from a sanitary standpoint as unburned gas is generated every time it is ignited, resulting in a foul odor. In addition, types that use proportional solenoid valves or control valves have a limit to the minimum thermal power of the main burner, and if you include the variation in valve accuracy, it can reach more than 500 kcal/H.
It was impossible to adjust the temperature because the heat was still strong.
In addition, the type that adjusts the heat with a manual knob has the same problem as the proportional solenoid valve and the control valve that it is too sensitive to heat, and it is difficult to finely adjust the heat by visual inspection.

Means for Solving the Problems In order to solve the above-mentioned problems, the gas stove of the present invention has a main burner and a pilot burner that are separated and integrally formed. A temperature sensor capable of detecting the temperature of the food to be cooked over a temperature range, an on-off valve that opens and closes gas to the burner, and a main switch that changes the gas flow rate downstream of the on-off valve and directs the gas to the main burner. A plurality of control valves disposed in the gas path, a mode setting section for presetting the cooking mode, a thermocouple attached in correspondence with the pilot burner, and a thermocouple that is installed in correspondence with the pilot burner, and a control valve configured to suit the cooking content of each cooking mode. A heating pattern is provided with a control unit controlled by a microcomputer or the like, and a pilot gas path from between the on-off valve and the control valve toward the pilot burner, and the temperature sensor, the on-off valve, and the control valve are provided. The mode setting section, the thermocouple, and the control section are electrically connected, and the mode setting section is configured to automate cooking by setting a cooking mode.

Effects According to the present invention, with the above-described configuration, if the mode setting section is set to the temperature control mode or the heat retention mode,
Until the set temperature set in the mode setting section is reached, multiple control valves are opened and the main burner and pilot burner heat the food, and when the temperature sensor detects the set temperature, multiple control valves are opened. The control valve is opened, the main burner is turned off, and heating is performed only by the pilot burner. (The thermal power of the pilot burner can be set to an extremely low level of around 150kcol/H by burning on a small surface.) Furthermore, in temperature control mode, if the temperature drops below the set temperature by heating only the pilot burner, Each control valve is opened and the main burner is turned on again, and the pilot burner is repeatedly opened fully and the pilot fire is repeated to maintain the set temperature.There is almost no temperature rise due to the pilot burner, and the pilot burner and main burner are integrated. Because of this structure, the pilot burner can quickly ignite the main burner, producing no foul odor and making little ignition noise, making it safe. Moreover, by setting the mode using the mode setting section, it becomes possible to easily keep food warm with the weak heat of the pilot burner alone.

In addition, if rice cooking mode or boiling mode is set in the mode setting section, when boiling or heating the rice, or when the temperature sensor detects the boiling temperature in the pot, a aisle, middle aisle,
Each of the weak passages can be opened or closed in response to a signal from the control section, allowing for strong, medium, and weak heating. Further, when the temperature of the temperature sensor reaches the cooking completion temperature in the rice cooking mode or the burning temperature in the boiling mode, the on-off valve is opened to stop heating.

In this way, much of the cooking can be automated, and by dividing the pilot burner and the main burner into one piece, it is possible to easily control the firepower and ignite the burner.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings FIGS. 1 to 7.
This will be explained based on the diagram. In the figure, 1 is a box body of a gas stove, and has a trivet 4 on the top surface on which a cooking pot 3 containing food 2 is placed, and a burner 5; When placed, there is a temperature sensor that comes into contact with the bottom surface and detects the temperature in the entire area necessary for all cooking.In addition, on the front side, there is a knob 7 for opening/closing the gas and igniting the gas, and a notification buzzer 8 (the buzzer is connected to the control section). 16), and a cooking knob 10 of a mode setting section 9 for setting a cooking mode. Furthermore, it has a gas connection port 11 and a power source 12 on the side.

FIG. 1 is a diagram showing the control system of the present invention. Reference numeral 13 denotes a gas supply path on the downstream side of the gas connection port 11, and this gas supply path 13 is connected to the gas tank 14.
The safety valve 17, which is an on-off valve that opens in conjunction with the thermoelectromotive force of the thermocouple 15 and is held open by the output of the control unit 16, passes through the gas tank 14 to the pilot gas path 1.
8 and a main gas path 19. Pilot gas path 18
is connected to the pilot nozzle 20 , and the main gas line 19 is branched and connected to the main nozzle 24 from solenoid valves 21 , 22 , 23 which are control valves consisting of three or more arranged in parallel. be done. At this time, the solenoid valve 21 is opened to produce high heat, and the solenoid valves 22 and 23 are opened to regulate the heat to medium and low heat, respectively, by orifices 25 and 26.
Note that instead of the solenoid valves 21, 22, and 23, which are on-off valves, gas proportional solenoid valves that can proportionally control the gas amount may be used. The burner 5 is integrally formed with a main burner 5a corresponding to the main nozzle 24 and a pilot burner 5b corresponding to the pilot nozzle 20. Therefore, the safety valve 17, which is an on-off valve, controls combustion and stops the burner 5, and the solenoid valves 21, 22, 23, which are control valves, adjust the combustion amount and use it as a pilot flame.
It is carried out by. 27 is a micro switch that is opened and closed in conjunction with the gas switch 14 and controls the control unit 16.
performs the following operations. The mode setting unit 9 has an electric contact or a variable resistance inside, and can be set to rice cooking mode, boiling mode (OFF, L, respectively) by the cooking knob 10.
It is possible to freely set various cooking modes such as M, ), temperature control mode, and keep warm mode. The control unit 16 receives electrical signals from a micro switch 27, a thermocouple 15, a mode setting unit 9, a temperature sensor 6, and a power supply 12, and controls a safety valve 17, solenoid valves 21, 22, 2.
A control circuit (not shown), a microcomputer, a buzzer 8, etc. (not shown) are built in to send electrical signals to the terminal 3. 2 to 5 show the structure of the burner 5, which is composed of a burner cap 28 and a burner body 29. A large number of flame holes are formed around the lower surface of the burner cap 28, and a main burner flame hole 30 and a pilot burner flame are formed. It is divided into a hole 31 and a partition wall 32. However, although the main burner 5a and the pilot burner 5b are independent, the flame can easily transfer from the pilot burner 5b to the main burner 5a. The burner body 29 includes a mixing pipe 33 of the main burner 5a and a mixing pipe 34 of the pilot burner 5b.
and sends gas from the outlet 35 to the main burner 5a and from the through hole 36 to the pilot burner 5b. The burner cap 28 is removably attached to the burner body 29 and is attached to the fitting part 3.
Positioned at 7,37', burner body 29
A main nozzle 24 and a pilot nozzle 20 are attached to each mixing tube. In addition, 38 is the main burner flame, 39 is the pilot burner flame, and the pilot burner 5
Thermocouples 15 are mounted opposite to each other at 36 in FIG. 5, and numeral 36 in FIG. 5 indicates the position of the opening of the pilot burner 5b when the burner cap 28 and burner body 29 are fitted together, with a broken line.

Next, FIG. 7 shows the operating states of each cooking mode set by the mode setting unit 11, (a) is rice cooking mode, (b) is boiling mode, (c) is temperature control mode, (d) is the heat retention mode, the vertical axis T in figure A represents temperature, and the horizontal axis X represents time, indicating the temperature state of the temperature sensor 8. The vertical axis Q in figure B represents thermal power, and the horizontal axis X represents time, indicating the thermal power control state. It shows. In rice cooking mode (a), the fire is ignited at high heat, the heat is lowered to medium heat suitable for immediate rice cooking (limiting the amount of rice cooked within a specified range), and the boiling temperature is reached in time x ₁ .
Detect T ₁ (detect T ₁ by means such as JP-A-58-45414), reduce the heat to low, and allow sufficient cooking time.
At X ₂ , the cooking temperature reaches T ₂ and the fire is extinguished. (The operation of the rice cooking mode is shown in Japanese Patent Application Laid-open No. 59-131829.) In the boiling mode (b), the ignition is performed with high heat, and the boiling temperature T ₁ is detected at time X ₁ as in the rice cooking mode. There, the firepower was controlled to the preset settings of OFF, L, M, and H. Furthermore, it is set to L, M, H,
If the water content decreases, the temperature increases and in time X ₂ the temperature T ₂
(The operation in boiling mode is described in Japanese Patent Application Laid-Open No. 58-45414,
In the temperature control mode (c) shown in Publication No. 58-200931, the ignition is performed with a high flame and the _{set temperature T 1 is} exceeded in time (set to a weak setting) repeatedly (pilot burner 5
b is always on and the main burner 5a is turned on and off) to keep the set temperature _T1 constant within a certain temperature range. Here, the main burner 5a may be throttled down to a low flame, and may also serve as a pilot flame. (The operation of temperature control mode is
(as shown in Japanese Patent Application Laid-open No. 174627/1983)
When re-igniting from the pilot flame, in order to prevent backfire due to the embers of the main burner 5a, the controller 16 is forced to prevent the ignition for a certain period of time after the main burner 5a has been _stopped . According to the report, the main burner 5a is not turned on for about 5 seconds).

In the heat retention mode (d), the flame is ignited with high heat, and the flame is immediately transferred to the pilot flame to keep it warm (the heat retention temperature T ₁ depends on the conditions of the pot and the food being cooked). The firepower control for each of these cooking modes is programmed by the control section 16 using a microcomputer (not shown) to operate appropriately.

In the above configuration, the gas control knob 7 opens the gas control knob 14 and the safety valve 17 and closes the micro switch 27, and gas flows from the gas supply path 13 through the pilot gas path 18 and main gas path 19 to the pilot gas nozzle 2.
0, the burner 5 burns from the main nozzle 24 and heats the food 2 from the cooking pot 3. Note that if a desired cooking mode is set in advance using the cooking knob 10 of the mode setting section 9 by closing the micro switch 27, this signal is input to the control section 16 and the safety valve 17 is activated.
is output to the solenoid valves 21, 22, and 23 and turned on.
The thermocouple 15 is heated by the pilot burner 5b and generates a thermoelectromotive force, which is connected to the safety valve 17 via the control section 16.
The safety valve 17 changes from a mechanically opened state using the knob 7 to an electrically opened state.
Therefore, if the pilot burner 5b misfires, the control unit 16
operates and closes the safety valve 17 to maintain safety. When used in this way, cooking knob 10
The temperature of the food 2 is input from the temperature sensor 6 to the control unit 16 and output to the safety valve 17 and solenoid valves 21, 22, 23 so that the cooking mode is controlled according to the cooking mode set by I do. A buzzer 8 attached to the control section 16 is configured to notify the user at an appropriate operating point of the cooking mode. For example, in the rice cooking mode shown in Figure 7, when the temperature reaches T ₂ , and in the boiling mode, the temperature
T ₁ and when the temperature reaches T ₂ , or when the temperature reaches T ₁ in the temperature control mode, etc.

As described above, the burner 5 is divided into the main burner 5a and the pilot burner 5b, which are integrally formed, and the pilot gas passage 18 is located downstream of the gas passage valve 17 and the opening/closing valve 17.
The temperature sensor 6
In response to the temperature signal, the control unit 16 appropriately opens and closes each control valve to automate the firepower control in accordance with the cooking content in the rice cooking mode and the boiling mode. next,
By providing the pilot gas path 18 between the on-off valve 17 and the control valves 21, 22, and 23 toward the pilot burner 5b, in the temperature control mode, the pilot gas path 18 is fully open (the main burner 5a
The set temperature can be kept constant by repeating the combustion (combustion) and pilot flame (low heat).

Furthermore, even when the main burner 5a is turned off and re-ignited, it is controlled not to be turned on for a preset time (approximately 5 seconds) to prevent backfire, and when the main burner 5a is turned on, the pilot burner 5b According to
It is quickly ignited and there is no odor caused by unburned gas, and since the burner 5 is integrally formed by dividing the main burner 5a and the pilot burner 5b, even if boiling over occurs from inside the cooking pot 3, the main The burner 5a is extinguished and the pilot burner 5b burns (there is a thermoelectromotive force of the thermocouple 15), and there is a danger that raw gas will be generated from the main burner 5a. It also has excellent safety, as it is impossible to do so. In addition, when it boils down, the starter burner 5b
If the fire is extinguished, the thermoelectromotive force of the thermocouple 15 disappears, and the control section 16 closes the on-off valve 17.

Next, by setting the heat retention mode in the mode setting section 9, heat retention can be easily achieved with the weak heat of the pilot burner 5b, and there is no need to delicately adjust the heat with a knob or the like.

Effects of the Invention As described above, the gas cologne of the present invention provides the following effects.

(1) The burner is divided into a main burner and a pilot burner, which are formed integrally, and a gas passage opening/closing valve, a pilot gas passage downstream of the opening/closing valve, and multiple control valves are arranged to strengthen the burner.・By forming a main gas path that allows the heating power to be changed between medium and low, the control unit receives the temperature signal from the temperature sensor and opens and closes each control valve appropriately to adjust the heating power to high, medium, and low, respectively. Since it has a low, pilot, and stop settings, it is possible to automate firepower control suitable for cooking in rice cooking mode and boiling mode, and in temperature control mode, it repeats strong heating and weak heating with the pilot burner. You can keep your food at a constant temperature to make it taste better, and in keep warm mode, you can easily keep your food warm with extremely low heat.

In this way, it is possible to provide an automatic gas stove that is easy to use and can control the firepower in accordance with the cooking mode by simply selecting a desired cooking mode with the cooking knob and operating the ignition.

(2) The main burner and pilot burner are integrally formed, and each time the main burner is turned on and off and ignited, the pilot burner quickly ignites the flame, causing odor caused by unburned gas. It is safe as there is no occurrence of

Furthermore, when the pilot burner relights the main burner, in order to prevent backfire of the main burner,
It is even safer because the main burner is controlled not to ignite for a certain period of time after it has stopped.

(3) Since the pilot gas path and the pilot burner are separate from the control valve side of the main gas path, an extremely hot flame can be ensured by closing the control valve.

[Brief explanation of drawings]

Fig. 1 is a control system diagram of a gas stove in an embodiment of the present invention, Fig. 2 is a vertical view of the burner, Fig. 3 is a plan view of the burner, Fig. 4 is a plan view of the burner body constituting the burner, and Fig. 4 is a plan view of the burner body constituting the burner. FIG. 5 is a bottom view of a burner cap constituting a burner, FIG. 6 is an external perspective view of the gas stove, and FIGS. 7A and 7B are control operation diagrams of various cooking modes. 2... Cooking food, 5... Burner, 5a... Main burner, 5b... Pilot burner, 6... Temperature sensor, 9... Mode setting section, 15... Thermocouple, 16
...Control unit, 17...Opening/closing valve (safety valve), 18...
... Pilot gas path, 21, 22, 23 ... Control valve (electromagnetic valve), T ₁ ... Set temperature, X _A ... Preset time.

Claims (1)

[Claims] 1. A burner that heats the food by dividing the main burner and the pilot burner into one, and a burner that can detect the temperature of the food over the temperature range necessary for all cooking. an on-off valve that opens and closes gas to the burner, and a plurality of control valves that change the gas flow rate downstream of the on-off valve and are arranged in a main gas path toward the main burner; a mode setting unit that presets a cooking mode; a thermocouple attached to the pilot burner; a control unit that uses a microcomputer or the like to control the heating pattern to suit the cooking content of the various cooking modes; A pilot gas path is provided between the on-off valve and the control valve toward the pilot burner, and the temperature sensor, the on-off valve, the control valve, the mode setting section, the thermocouple, and the control section are provided. A gas stove which automates cooking by electrically connecting a cooking mode and setting a cooking mode using the mode setting section. 2. The gas stove according to claim 1, wherein when the mode setting section is set to the keep warm mode, the pilot burner keeps the food warm. 3 When the temperature control mode is set in the mode setting section, the pilot burner continues combustion and the main burner is turned on and off to keep the set temperature constant, and the main burner is turned on and off regardless of the temperature signal from the temperature sensor. 2. The gas stove according to claim 1, wherein the off time of the gas cooker is forcibly set so as not to be turned on for a preset time.