KR100429417B1 - Boiling detection device of gas oven and method thereof to prevent incomplete boiling of food - Google Patents

Abstract

PURPOSE: A boiling detection device of a gas oven and a method thereof are provided to execute boiling of water in an optimum state by exactly detecting a boiling point of time of water via a boiling detection unit and then prolonging combustion and heating for predetermined time from the boiling point of time and making automatic fire extinguishing executed. CONSTITUTION: In a boiling detection device of a gas oven, a key input part(1) comprising plural keys and ignition and fire-extinguishing buttons(2) are installed to a front panel(101) of a gas oven body(100). A thermistor for detecting temperature of a cooking vessel is installed to a burner part(3) formed to the top of the gas oven body and the heating value is controlled by a control part having a microcomputer. The control part comprises a thermistor temperature recognition part receiving an output signal of the thermistor and recognizing the current temperature of the cooking vessel; a temperature-comparing part comparing the output signal of the thermistor temperature recognition part and the boiling temperature and producing a control signal to a combustion control part when the current temperature of the cooking vessel reaches the boiling temperature of water; a mode recognition part receiving an output signal of the key input part, recognizing a user's selecting mode, and outputting a signal to the combustion control part; a flame-detecting part recognizing execution of ignition if a signal is output from a thermocouple installed to the burner part and informing the combustion control part of execution of ignition; the combustion control part receiving the output signals of the temperature-comparing part, the mode recognition part, and the flame-detecting part, executing a predetermined program, and producing output signals required from system control; a solenoid valve drive part selectively opening and shutting a solenoid valve by the control of the combustion control part; and a solenoid valve-monitoring part informing the combustion control part of the opening and shutting state of the solenoid valve.

Description

Boiling Point Detection Device for Gas Range and Method

The present invention relates to a boiling point detection device and a method of the gas range, in particular, after the combustion heating is extended for a predetermined time when the boiling point of the temperature rise does not occur while the combustion heating is in progress by the selection of the water cutting mode The present invention relates to a boiling point detection device and a method of a gas range for automatic extinguishing so that water is cut in an optimal state.

In the conventional gas stove, most of the water cutting mode is not provided at all, so when cooking water, the cook has to check the water cutting state in the container (kettle and pot) by eye and adjust the fire power.

However, when the cooking of the predetermined cooking does not necessarily exist in the vicinity of the gas range, it often occurs when the water is not recognized this.

If the water is cut and not recognized, the combustion heating continues, so all the water evaporated and there was always a risk of fire due to overheating.

Therefore, in recent years, as a means for preventing overheating, there has been developed a gas range equipped with a high cut function that stops combustion by shutting off the gas supply when the temperature of the container rises to a high temperature. Since the water is all evaporated in the container and the combustion is stopped after the temperature of the container itself is raised to a high temperature, there is a problem in that the cooking cannot be completely prevented from sticking and the occurrence of fire due to overheating.

However, if you stop the combustion at the boiling point unconditionally, the food contained in the water will not mature.For example, if you stop barley tea or instant ramen noodles, the barley tea will be completely crying when the combustion heating is stopped at the boiling point of water. If it is not, or ramen is cooked.

Therefore, in recent years, a gas range equipped with a water stop mode has been developed, and when the water stop mode is selected in such a gas range, the gas range is configured to determine whether water is boiled or not by the inclination of the temperature detected by the temperature sensor. have.

That is, as the combustion of the gas proceeds, the temperature detected by the temperature sensor rises, and it is determined that the water has boiled down to a state in which the slope of the rising temperature is always below a predetermined value, that is, the temperature of the water When the time point at which the equilibrium state is reached is detected, it is determined as the boiling temperature and the control of the extinguishing operation to stop the heating power of the gas is performed.

However, in such a method, a predetermined value for determining whether an unconditional material has boiled without considering the thermal power and the amount of water is determined by detecting the temperature rise slope before boiling and determining the boiling point. there was.

On the other hand, the present applicant has proposed a control device and a method for the water cutting mode of the gas stove in 1995 Patent Application No. 17194, which detects the equilibrium temperature during the combustion heating by the user's selection of the water cutting mode When the combustion heating is continued for a predetermined time.

In this manner, heating is controlled by determining only an equilibrium state without checking the inclination (part A of FIG. 6) according to the temperature rise during the initial heating.

Of course, when the water starts to break, you can determine the boiling state of the water accurately by displaying a graph like c in FIG. 6, but when there is a difference in the quantity of water for the same firepower, or when the firepower is adjusted for the same quantity of water, Compared to the amount of water in the case of the role of fire or vice versa, the equilibrium state is detected in the state that the water is not broken, as shown in Figure 6, a, b, there was a problem that the water can not be made in the optimum state.

It is an object of the present invention to detect the boiling point of water more accurately through boiling detection means when the user selects the water-stop mode and the combustion heating proceeds, and then extends the combustion heating for a predetermined time from this point, and then automatically extinguish the fire. It is to provide a boiling point detection device and a method of the gas range can be made in the optimum state of water interruption.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figs. 1 and 2, the device of the present invention has several keys and is installed on the front panel 101 of the gas range body 100 and composed of various keys for setting the control mode of the device. An input unit 1, a dot, a fire extinguishing button 2, and the like are installed on the front panel of the gas range body 100, and the burner part 3 formed on the upper surface of the gas range body 100 is lifted by a spring force. In the configuration of a gas range control device, in which a thermistor 4 having a descending structure and detecting a temperature of a cooking vessel is installed and the heating amount is controlled by the control unit 10 centered on the microcomputer 10A, the control unit 10, the thermistor temperature recognition unit 11 for receiving the output signal of the thermistor (4) to recognize what the current vessel temperature is ℃; A temperature comparison unit for generating a predetermined control signal to the combustion control unit 16 when it is determined that the current vessel temperature reaches the boiling point of water by comparing the output signal of the thermistor temperature recognition unit 11 with the boiling temperature ( 13); A mode recognizing unit 14 which receives the output signal of the key input unit 1 and recognizes which mode the user's selection mode is, and outputs a predetermined signal to the combustion control unit 16; A salt detection unit 15 which recognizes that the ignition is performed when the predetermined signal is output from the thermocouple 5 installed in the burner unit 3 and informs the combustion control unit 16 of the flame detection unit 15; A combustion control unit 16 which receives the output signals of the temperature comparing unit 13, the mode recognizing unit 14 and the salt detecting unit 15, respectively, and executes a predetermined program to generate output signals necessary for system control; An electromagnetic valve driver 19 for selectively opening and closing the electromagnetic valve 6 under the control of the combustion controller 16; It is characterized by having an electromagnetic valve monitoring unit 20 for informing the combustion control unit 16 of the open and close state of the electromagnetic valve (6).

At this time, the temperature comparison unit 13 includes a temperature rise detection unit 12 for detecting whether the temperature of the container continues to rise; A boiling detection unit 12a for detecting whether the contents in the container have reached the boiling point; The boiling point is detected by the change of the surrounding conditions at present, the boiling point detection unit 12b for judging whether or not the boiling point is actually reached.

In addition, the combustion control unit 16 includes an abnormality detecting unit 17 for detecting an abnormal state such as overheating; A fire extinguishing unit 17a for generating a blocking signal to the electromagnetic valve 6 when the temperature of the container becomes higher than the minimum temperature after the boiling point is detected; When a predetermined control signal is output from the combustion control unit 16 by detecting the boiling temperature in the temperature comparing unit 13, the timer 17b generates a control signal for continuously driving the electronic valve 6 for a predetermined time. Configure.

As shown in FIG. 3, the method of the present invention comprises the steps of: extracting and storing the temperature periodically detected through the thermistor (4); Performing a subroutine for measuring the speed according to the temperature rise at the beginning of heating; The time taken to rise from the first temperature value T1 (85 ° C.) of the vessel detected by the thermistor to the third temperature value T2 (95 ° C.) is divided by a predetermined number (eg, 3) and the variable TK. Performing a variable value determination subroutine yielding a value as); Measuring a time (TA) taken to increase by 1 ° C after rising to the third temperature value (T2; 95 ° C); Determining a false detection condition by obtaining a correction value α through a predetermined equation ((TK / 2) -TA); Detects whether the current container temperature reaches the boiling point and the fire extinguishing point in sequence, and if it does not reach each point, it repeats from the measurement process of time (TA) to increase by 1 ℃ and if the two conditions are satisfied It consists of the process of performing the basic features.

As shown in (a) of FIG. 4, the initial temperature rising rate subroutine detects whether the temperature detected by the thermistor 4 is equal to or greater than the second temperature value (e.g., 90 ° C). Setting a value to a default value; If the result of the determination is less than the second temperature value, detecting whether the temperature is greater than or equal to the first temperature value and if the temperature is higher than the second temperature value, measuring the time taken for the temperature TH detected by the thermistor 4 to rise by 1 ° C; If it is less than the first temperature value in the above it was made of a process of measuring the time it takes to rise to the third temperature value.

In addition, as shown in (b) of FIG. 4, the variable value TK determination subroutine takes the time it takes to rise from the first temperature value T1 (85 ° C) to the third temperature value T2 (95 ° C). Dividing [Delta] T by a predetermined number (e.g., 3) and calculating it as a variable (TK) value; Detects whether the calculated variable value TK is greater than or equal to the minimum value. If the calculated variable value is less than the minimum value, the minimum value is stored as the variable value TK and whether the current variable value is greater than or equal to the maximum value as in the case where the variable value TK is greater than or equal to the minimum value. Detecting; As a result of the comparison, when the variable value TK is greater than or equal to the maximum value, the maximum value is stored as the variable value TK and the process ends as in the case where the variable value TK is less than the maximum value.

In addition, as shown in (c) of FIG. 4, the fire extinguishing subroutine has a predetermined time (ΔT) for increasing from the first temperature value (T1; 85 ° C) to the third temperature value (T2; 95 ° C). Detects if the time is longer (e.g. 24 seconds) and if it is abnormal, the combustion time is extended by a second time (e.g. 4 minutes), and if less than a predetermined time, the combustion time is extended by the first time (e.g. 3 minutes) After each of the extended combustion time is made to proceed with the fire extinguishing operation.

Referring to the effect of the present invention in detail as follows.

First, the user of the gas cooker puts a container containing a predetermined food on the upper surface of the trivet and operates the ignition button (2) to fry cooking through the key input unit (1) in the state of gas combustion by normal ignition You can choose either cooking, cooking or water cutting mode.

However, when the cooker selects the water stop mode through the mode selection key installed in the key input unit 1 in the normal combustion state as described above, the mode recognition unit 14 in the microcomputer 10A immediately recognizes this and burns the combustion control unit 16. Outputs a predetermined signal.

Accordingly, the combustion control unit 16 recognizes that the current use mode is the water stop mode, and outputs a predetermined control signal to the temperature comparison unit 13 so as to elastically contact the bottom surface of the cooking vessel in the temperature comparison unit. It is made to continuously detect whether the vessel temperature detected by the thermistor 4 which reached the boiling point has reached the boiling point.

That is, the temperature comparison unit 13 extracts and stores the temperature periodically detected through the thermistor 4, and then measures the speed according to the temperature rise in the initial stage of heating.

In other words, the temperature comparison unit 13 detects whether the temperature detected by the thermistor 4 is equal to or greater than 90 ° C., which is the second temperature value, and sets the value as a default value if it is equal to or greater than the second temperature value.

However, as a result of the above determination, if the bottom surface temperature of the container is less than 90 ° C, it is again detected whether or not the first temperature value is 85 ° C or higher, and if it is higher, the temperature TH currently detected by the thermistor 4 rises by 1 ° C. Although it takes time to measure, if it is less than a 1st temperature value, it will measure the time to rise to 95 degreeC which is a 3rd temperature value.

At this time, the temperature comparison unit 13 includes a temperature rise detection unit 12 that detects whether the temperature of the container continues to rise, a boiling detection unit 12a that detects whether the contents in the container have reached a boiling point, and the currently detected boiling point. Since it is comprised by the boiling error detection determination part 12b which judges whether the boiling point is not actually reached with the value detected by the change of the surrounding conditions, it becomes possible.

As described above, when the initial temperature rise rate is detected, the time required for the combustion control unit 16 to increase the temperature of the vessel from 85 ° C, which is the first temperature value T1, to 95 ° C, which is the third temperature value T2 (ΔT). Is calculated (i.e., the amount of water in the container), and this value is divided by a predetermined number (e.g., 3) to calculate the variable (TK) value.

That is, after calculating the variable TK by dividing the time ΔT from the first temperature value T1 (85 ° C.) to the third temperature value T2 (95 ° C.) by a predetermined number (eg, 3), In this case, it is determined whether the calculated value TK is greater than or equal to the minimum value or less than the maximum value. This is to limit the range because the heat amount of the gas burner may be large or small.

As a result of the above detection, if the variable value TK is less than the minimum value, the minimum value is stored as the variable value TK, and then the current variable value TK is greater than or equal to the maximum value, as when the variable value TK is greater than or equal to the minimum value. Acknowledgment is detected. As a result, if the variable value TK is greater than or equal to the maximum value, the maximum value is stored as the variable value TK, and then the process ends as in the case where the variable value TK is less than the maximum value.

As such, when the variable value TK = ΔT / 3 is determined, the combustion control unit 16 immediately enters the boiling judgment by measuring the time TA for rising by 1 ° C.

On the other hand, when entering the boiling determination as described above, when the flame is blown by the influence of wind, the flame directly touches the thermistor 4, and the temperature value detected by the thermistor 4 is shorter than the temperature rise rate under normal combustion conditions. When the 1 ℃ rise measurement is made instantaneously and the flame is in a steady state, the detected temperature value of the thermistor is lowered than the temperature value at the previous 1 ℃ rise, and the rate of 1 ℃ rise takes longer than before. There is a concern.

Therefore, in the present invention, after the time TA taken to rise by 1 ° C is measured as described above, the correction value α is calculated through the predetermined equation ((TK / 2) -TA) to determine the false detection condition of the boiling point. Next, the boiling point is entered.

The boiling point detection condition at this time is determined to be a boiling state when the time TA required to rise by 1 ° C is greater than or equal to the value obtained by adding the correction value α to the variable TK.

That is, the boiling detection unit 12a in the temperature comparison unit 13 determines that the boiling point is reached when the condition of TA? TK + α is satisfied, and outputs a predetermined signal to the combustion control unit 16.

Of course, if the boiling detection condition is not satisfied, the boiling point detection determining unit 12b in the temperature comparing unit 13 outputs a predetermined control signal to the combustion control unit 16, whereby the boiling point is incorrectly detected. It is possible to prevent the operation of the timer 17b in the combustion control unit 16 in advance.

On the other hand, the larger the required time TA, the larger the correction value α, so that it becomes difficult to satisfy the condition of TA ≥ TK + α, thereby making it possible to more reliably prevent false detection of boiling.

Thereafter, the combustion control unit 16 continuously detects whether the current vessel temperature has reached the boiling point and the extinguishing point, and sequentially detects each point (that is, conditions of TA ≥ TK + α and fire extinguishing conditions) as shown in FIG. When reached to close the electronic valve 6 through the fire extinguishing unit 17a to block the combustion operation of the gas.

At this time, the fire extinguishing operation first counts the time from the moment when the first temperature value T1 detects 85 ° C in the thermistor 4, and the time taken to rise to 95 ° C, which is the third temperature value T2, ΔT. Then, it is detected whether this value (that is, ΔT) exceeds a predetermined time (e.g., 24 seconds). If the value exceeds 24 seconds, the combustion time of the gas is changed by the timer 17b. E.g., 4 minutes), and if it is less than a predetermined time, the combustion time is extended by the first time (e.g., 3 minutes), and after each extended combustion time is completed, the electromagnetic valve 6 is By closing, the water is cut off in an optimal state.

On the other hand, the opening and closing of the electromagnetic valve 6 is detected by the electromagnetic valve monitoring unit 20 is input to the combustion control unit 16, the combustion control unit can always know the opening and closing state of the electromagnetic valve.

As described above, according to the present invention, the quantity of water can be accurately determined by measuring the time ΔT taken to rise from the first temperature value T1 to the third temperature value T2, and it is not the equilibrium temperature. The initial point of equilibrium temperature (ie boiling point) can be determined more quickly and accurately by measuring the rate of rise, and even if the judgment of the boiling point by measuring the rate of rise is incorrect, the minimum temperature of boiling temperature is taken into account immediately. As the combustion control is extended without going to the extinguishing control, it is possible to prevent food incompleteness due to the stopping of the combustion in a less water-free state in advance, as well as to stop the water in an optimal state.

1 is a front view of a gas range to which the present invention is applied.

2 is a block diagram of an apparatus of the present invention.

3 is a main flowchart of the method of the present invention.

(A) of FIG. 4 is a flowchart showing the subroutine for measuring the initial temperature rise rate in FIG.

(B) is a flowchart of the variable TK value determination subroutine in the third step.

(C) is a flow chart of the digestion operation subroutine in FIG.

5 is a graph of measurement of the elapsed time zone detection temperature increase in the gas range to which the present invention is applied.

6 is a temperature rise curve diagram when the equilibrium temperature detection method is adopted in a conventional gas range.

Explanation of symbols on main parts of drawing

1: Key input 4: Thermistor

5: thermocouple 6: electronic valve

10: control unit 10A: microcomputer

11: thermistor temperature recognition unit 12: temperature rise detection unit

12a: boiling detection unit 12b: boiling false detection determination unit

13 temperature comparison unit 14 mode recognition unit

15: salt detection unit 16: combustion control unit

17: abnormal detection unit 17a: fire extinguishing unit

17b: timer 19: electronic valve drive unit

20: electronic valve monitoring unit

Claims (9)

Extracting and storing the temperature periodically detected by the thermistor 4; Performing a subroutine for measuring the speed according to the temperature rise at the beginning of heating; A variable value determination subroutine that calculates a variable TK value by dividing the time ΔT taken from the first temperature value T1 of the vessel detected by the thermistor to the third temperature value T2 by a predetermined number. Performing process; Measuring a time TA taken to rise by 1 ° C after rising to the third temperature value T2; Determining a false detection condition by obtaining a correction value α through a predetermined equation ((TK / 2) -TA); Detects whether the current container temperature reaches the boiling point and the fire extinguishing point in sequence, and if it does not reach each point, it repeats from the measurement process of time (TA) to increase by 1 ℃ and if the two conditions are satisfied Wherein the initial temperature rise rate subroutine is a step of detecting whether the temperature detected by the thermistor (4) is greater than the second temperature value, and if the second temperature value is greater than or equal to the value; If the result of the determination is less than the second temperature value, detecting whether the temperature is greater than or equal to the first temperature value and if the temperature is higher than the second temperature value, measuring the time taken for the temperature TH detected by the thermistor 4 to rise by 1 ° C; If the first temperature value is less than the boiling point detection method of the gas range comprising the step of measuring the time taken to rise to the third temperature value. The variable TK of claim 1, wherein the variable TK determination subroutine is obtained by dividing the time ΔT taken from the first temperature value T1 to the third temperature value T2 by a predetermined number. Calculating the value; Detects whether the calculated variable value TK is greater than or equal to the minimum value, and if it is less than the minimum value, the minimum value is stored as the variable value TK and whether the current variable value is greater than or equal to the maximum value as in the case where the variable value TK is greater than or equal to the minimum value. Detecting; As a result of the comparison, when the variable value TK is greater than or equal to the maximum value, the boiling point of the gas range is made of storing the maximum value as the variable value TK and ending as in the case where the variable value TK is less than the maximum value. Detection method. The combustion time subroutine according to claim 1, wherein the fire extinguishing subroutine detects whether the time ΔT taken to rise from the first temperature value T1 to the third temperature value T2 is greater than or equal to a predetermined time and is equal to or greater than a predetermined time. Is extended by a second time, and if less than a predetermined time, the combustion time is extended by the first time, and then each extinguishing combustion time is completed, the process of extinguishing the operation of the gas range characterized in that it consists of a process. . 4. The boiling point detection method according to any one of claims 1 to 3, wherein said first temperature value (T1) is 85 deg. The boiling point detection method of a gas range according to any one of claims 1 to 3, wherein the third temperature value T2 is 95 ° C. 2. The boiling point detection method of a gas range according to claim 1, wherein said second temperature value is 90 deg. 4. The boiling point detection method of a gas range according to claim 3, wherein said first time is three minutes. 4. The boiling point detection method of a gas range according to claim 3, wherein said second time is four minutes. 4. The boiling point detection method of a gas range according to claim 3, wherein the predetermined time is 24 seconds.