JPH0794890B2 - Burning appliances - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion instrument using gas or the like as a fuel source.

2. Description of the Related Art In recent years, with the development of electronic control, the number of combustion appliances performing electronic control has increased.

Problems to be Solved by the Invention For example, a gas stove or the like has a convenient thing that combustion is started by a simple operation of a light touch type, but since the control is performed by a solenoid valve, the solenoid valve can only control ON / OFF. Its usability and safety were poor and it lacked practicality.

The present invention eliminates these drawbacks, and provides a combustion instrument that is convenient, highly safe, and highly practical.

Means for Solving the Problems In order to solve the above problems, the present invention uses a solenoid valve and a motor cock, uses a combustion sensor that detects a combustion state, and a temperature sensor that detects the temperature of a cooked product, and uses these. It is provided with a control circuit for controlling safely and effectively.

Effects The present invention forms a combustion instrument which is convenient, safe and has high practical value according to the above-mentioned invention.

Examples Hereinafter, a gas combustion cooker according to an embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows a gas table which is an embodiment of the present invention. FIG. 5 is an enlarged front view of the operation panel portion, and FIG. 3 is a gas supply circuit diagram thereof. FIG. 1 shows the same control circuit diagram, and FIG. 2 shows its block diagram.

1 is a gas table body, 2 is an igniter, 3 is a burner, 4 is a combustion sensor, 5 is a temperature sensor, 6 is an operation panel, 7 is a timer display section in the operation panel, and 8 is an operation button for setting the timer. , 9 is an automatic harmonic control operation button for controlling a desired combustion state, 10 is a temperature setting volume for obtaining a desired temperature, 11 is an operation button for selecting the volume, and 12 is a predetermined sequence control. Operation buttons for rice cooking and setting, 13 is a point fire extinguishing operation button for igniting and extinguishing, 14 is a heat power setting operation button for setting heat power, 5 is the temperature sensor, 3 is the burner, 15 is a motor cock, 16 Indicates a solenoid valve.

Further, in FIG. 1, 17 is a power outlet, 18 is a thermal fuse, 19 is a power circuit, 13 is a fire extinguisher button, 7 is the timer display section, 20 is thermal power for displaying the thermal power set by the thermal power setting operation button. Indicator lamp, 21 is a safety transistor that stops energization of the solenoid valve when the circuit element for driving the first solenoid valve is short-circuited, 22 is a safety switch that is turned off when normal operation is not performed for a long time, 16 is the solenoid Valve, 15
Is the motor cock, 23 is the volume, 24 is a resistor for checking the voltage of the solenoid valve, 25 is a solenoid valve driving transistor, 26 is a microcomputer (hereinafter referred to as microcomputer), and 27 is a combustion detection circuit. 28 in Fig. 2
Is a combustion flame detection unit, 29 is a motor cock position detection circuit, 35 is the operation switch detection circuit, 26 is a microcomputer, 34 is an LED display circuit, 33 is a temperature setting circuit, 32 is a temperature sensor detection circuit,
Reference numeral 31 is a solenoid valve drive circuit, and 30 is a motor cock drive circuit.

The operation of the gas table configured as described above will be described. First, when the fire extinguisher button 13 is pressed, the igniter 2 starts discharging. At this time, the control circuit confirms the safe state of these control circuits by the microcomputer 26. For example, if the safety transistor 21 has a short circuit failure, the voltage of the resistor 24 becomes high. If there is no abnormality, it is low (note that the safety switch 22 is λ at this time). Further, next, the safety transistor 21 is turned on and the failure of the solenoid valve driving transistor 25 is checked. At this time, if the resistance 24 is not at a high voltage, it means that the solenoid valve driving transistor has a short circuit failure, and therefore the next sequence cannot proceed. In this way, after checking the safety of the control circuit, the motor cock 15 is set to the strong position. The motor cock 15 is driven by the motor cock drive circuit 30. First, before starting the operation, the motor cock 15 is completely checked whether the stop position is reached or not. That is, the motor cock position detection circuit detects that the motor cock position is always closed when the power is on. And if these safety is confirmed, the motor cock will be in a strong position regardless of the thermal power setting. Generally, when ignited by weak combustion, it becomes backfire, but this is to prevent backfire of combustion. When this strong position is confirmed, the solenoid valve 16 opens. Then, the gas reaches the burner 3 and combustion is started by ignition. If a certain amount of time has passed and combustion has not started, the solenoid valve is closed. The presence or absence of combustion is determined by the combustion sensor 4. If the input of the combustion sensor 4 at the start of combustion is detected, the microcomputer 26 regards it as a failure of the combustion detection circuit 28 (it detects that there is a flame even though there is no flame yet). Therefore, the ignition operation is not performed. However, if it is within a certain time immediately before combustion is started, it is considered that the combustion sensor 4 holds the previous combustion state due to the heat capacity, and therefore the microcomputer 26 operates so that this safety circuit does not operate. Similarly, since the microcomputer 26 does not memorize the previous state for a certain time after the power is turned on, this circuit does not operate.

Next, when ignition is confirmed by the combustion sensor 4, the motor cock 15 is throttled to a preset heat power position.
These motor cock positions are determined by the motor cock position detection circuit 29. The motor cock 15 is driven by the motor cock drive circuit 30. Driving the motor cock requires a large amount of torque at the start of operation, so the applied voltage is set high. Immediately before stopping, the voltage is set low to prevent overrun of the motor cock and set an accurate stop position. Further, when the motor cock 15 rotates, whether or not the motor cock 15 is operating in a predetermined order is always checked by the motor cock position detection circuit 29 through the microcomputer 26. That is, when moving to a strong position, it is a weak position properly,
Then check if you have moved through the middle position. This leads to checking whether the motor cock stop position is secured safely. If any of the positions is broken due to wear or the like, it operates so as to stop safely. If it is not safe, the solenoid valve 16 is closed.

Further, the solenoid valve driving unit and the safety transistor 21 are driven in an oscillating state. And that state is always resistance 24
Is checked by the microcomputer 26. Similarly, the combustion detection circuit 28 is also oscillated. This is to ensure safety in the event of failure of the elements and circuits that drive and detect them.

Although the combustion is started as described above, the temperature of the food is constantly monitored by the temperature sensor 5 during the combustion. First, it is detected whether the temperature sensor is open or short-circuited. In case of failure, combustion is stopped. If there is no abnormality, the temperature sensor 5 has many functions. When the pot bottom temperature reaches 250 ° C or higher, combustion is stopped. This is to prevent tempura fire and the like. Further, if the stewing material is set by the operation button 9, it burns with strong combustion until boiling and burns at a desired strength after detecting boiling. Boiling detection is performed when the temperature rise becomes constant. That is, the temperature always rises up to 100 ° C, but does not rise thereafter. If the temperature rises by about 15 ° C or more after boiling is detected, combustion is stopped. This is to prevent the bottom of the pot from burning. Further, when the operation button is set to cook rice, the sequence control is performed such that the combustion starts with a high heat, then the heating power according to the amount of cooked rice, and finally the high heat again, extinguishes the fire for a certain period of time, and burns again. As a means for detecting the amount of cooked rice, the microcomputer 26 calculates the temperature rise rate when burning with a constant thermal power.

Further, if the temperature control is selected by the operation button, the desired temperature of about 50 to 250 ° C. can be kept constant by the temperature control 10. Further, a timer operation unit and a display unit are also provided so that these cooking times can be arbitrarily set. Further, regardless of these, it is also possible to perform combustion by pressing the heat power setting button 14 as a manual operation. This display is made by the combustion display lamp 20.

EFFECTS OF THE INVENTION As described above, the present invention provides a convenient and safe combustion instrument with high utility value by providing a motor cock in series with a solenoid valve and providing a detection circuit for detecting the combustion state and the temperature state of cooked food. Can be provided.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a gas table in an embodiment of the combustion apparatus of the present invention, FIG. 2 is a block diagram of the control circuit,
3 is a gas supply circuit diagram, FIG. 4 is a perspective view of the gas table, and FIG. 5 is an enlarged front view of the operation panel portion. 3 …… Burner, 4 …… Combustion sensor, 5 …… Temperature sensor, 13 …… Point fire button, 15 …… Motor cock, 16 ……
Solenoid valve, 26 ... Microcomputer, 28 ... Combustion detection circuit, 30 ...
Motor cock drive circuit, 31 …… Solenoid valve drive circuit, 32 ……
Temperature sensor detection circuit.

Claims (1)

[Claims] 1. A burner, a combustion sensor for detecting a combustion flame of the burner, a solenoid valve arranged in a combustion passage of the burner, a motor cock provided in series with the solenoid valve, and a burner of the burner. An operation switch for operating combustion, a display device for displaying the combustion state and operation state, a temperature sensor for detecting the temperature of the cooked food heated by the burner, and the operation switch for operating the solenoid valve and the motor cock. A solenoid valve drive circuit and a motor cock drive circuit, a combustion detection circuit that detects the combustion state by the combustion sensor to activate the solenoid valve and the motor cock, and a temperature sensor that similarly changes the combustion state by the temperature sensor. A combustion instrument having a detection circuit.