JP2000070157A - Tempura stove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an occurrence of a problem of a false judgement that a temperature sensor has come off at the time when oil is added during heating, by a method wherein the temperature sensor is fitted on a pot which is mounted on a heating source, and in which an oil is contained, and for a micro-computer which controls the heating source based on the temperature detected by the temperature sensor, a program to judge the removal of the temperature sensor, is provided. SOLUTION: On a main body 1, a heater 2 which is a heating source is set, and on the heater 2, a pot 3 is mounted. Then, the control of the heater 2 is performed by a control element 4 which is driven by a signal from a control substrate 5. That is, during a heating of the pot 3, the temperature of an oil in the pot 3 which is detected by a temperature sensor 7 detachably fitted on the pot 3 with an attaching metal fixture 8, is checked at every specified period of time which is determined in advance. Since the temperature change of the oil in this case is either one of an ascent, a descent and being stable, when an ascent or being stable is detected even once during another specified period of time, until a continuous descending temperature change is detected from a point when a descending temperature change has been detected again, the removal of the fitting of the temperature sensor 7 is prevented from being judged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tempura range used for general home use or business use.

[0002]

2. Description of the Related Art Conventionally, a temperature sensor for detecting the temperature in a pot has been an important component for ensuring safety in a tempura range that uses a large amount of oil for cooking. In order to accurately detect the temperature of the oil, it is attached to the pan so that the sensor is completely immersed in the oil.

[0003] If the temperature sensor is not properly mounted and the oil temperature cannot be accurately detected, the oil may be heated to a high temperature due to continuous heating, leading to a danger of smoking or ignition.

In a conventional tempura range, a microcomputer (hereinafter referred to as "microcomputer") determines whether or not the temperature sensor is normally mounted. If the temperature sensor is disconnected during heating (or is not properly mounted), , Heating was stopped by a microcomputer to improve safety. Hereinafter, a conventional method of judging that the temperature sensor has deviated from the microcomputer will be described.

The determination is made based on the rise in the temperature detected by the temperature sensor at a point in time when a certain time has elapsed from the start of heating. As shown in FIG. 6, when the temperature sensor is normally mounted, the oil temperature rises due to heating, so the detected temperature rise value is equal to or greater than ΔT1 when t1 has elapsed from the start of heating. On the other hand, when the temperature sensor is off, the rise value is less than ΔT1 even though the oil temperature is rising, and it is determined that the temperature sensor is off.

Further, the determination is made based on a change in the temperature detected by the temperature sensor after the start of heating. As shown in FIG. 7, when the temperature sensor is normally mounted, the change in the detected temperature rises or stabilizes, so that the change in the detected temperature during t2 is ΔT2.
It is as follows. On the other hand, when the temperature sensor is off (on the way), the change in the detected temperature drops significantly, so that the detected temperature change becomes ΔT2 or more, and it is determined that the temperature sensor is off.

[0007]

However, the above method has the following problems. When the number of cooking is repeated and the amount of oil in the pan decreases, add oil, but add oil is not always performed only while heating the tempura range is stopped,
It is also conceivable for some users to add oil during heating.

When a large amount of oil is added during heating, the change in the detected temperature is not less than ΔT2 during t2 in FIG. There is a problem that the heating is erroneously determined and the heating is stopped.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and checks a change in the temperature detected by a temperature sensor at regular intervals during heating. Here, the change is rising (+), falling (-), stable (± 0)
If a temperature change (−) is continuously detected during another predetermined time, which is an integral multiple of the certain time, it is determined that the temperature sensor is out of the range. If it changes once (+) or (±)
If (0) is detected, the temperature sensor is not judged to be out of the temperature sensor until (-) temperature change is continuously detected for another predetermined time from the time when (-) temperature change is detected again.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a pot containing oil is placed on a heater as a heating source, a temperature sensor is detachably attached to the pot with a mounting bracket, and the temperature detected by the temperature sensor is input. A microcomputer for controlling the amount of heating of the heater is provided, and the microcomputer further has a program for determining whether or not the temperature sensor is detached by determining whether the detected temperature rises again within a predetermined time after the temperature detected by the temperature sensor falls. Things.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a tempura range according to the present invention. In the figure, reference numeral 1 denotes a main body, and a heater 2 serving as a heating source is provided above the main body 1, and a pot 3 is placed thereon. The control of the heater 2 is performed by the control element 4 driven by a signal from the control board 5, and the AC power cord 9
A control element 4 is connected between the heater and the heater 2. Reference numeral 6 denotes an operation unit, which includes a key for operating a tempura range and a display unit for displaying an operation state, and is connected to the control board 5.

Reference numeral 7 denotes a temperature sensor for detecting the temperature of the oil in the pan 3, which is detachably attached to the pan 3 by a mounting bracket 8. The sensor section of the temperature sensor 7 is completely immersed in oil, and is connected to the control board 5.

FIG. 2 is a block diagram of a control circuit for controlling the operation of the tempura range of this embodiment. In the figure, reference numeral 10 denotes a commercial power supply, and power supplied from the commercial power supply 10 is supplied to a heater 2 as a heating source via a control element 4.

The power supply circuit 13 supplies power to the entire control circuit, the key input circuit 14 sets the operation of the tempura range, and the display circuit 15 displays the operation status of the tempura range. It is connected to a microcomputer 11 that controls the whole.

The temperature sensor 7 is input as a temperature detection signal to a microcomputer 11 via a temperature detection circuit 12, and the control element 4 is controlled by an output signal from the microcomputer 11. Further, the microcomputer 11 has a program for determining whether or not the temperature sensor 7 described below is detached.

FIGS. 3, 4 and 5 show the detected temperature of the temperature sensor. During the heating, the temperature detected by the temperature sensor 7 is checked every predetermined fixed time t3. Here, the change is one of three states of rising (+), falling (-), and stable (± 0).
If a temperature change (-) is continuously detected during another predetermined time t4, which is an integral multiple of 3, it is determined that the temperature sensor is off. If (+) or (± 0) is detected as a change even once during another fixed time t4, (-) is applied again.
It is not determined that the temperature sensor has come off until a (-) temperature change is continuously detected for another predetermined time t4 from the time when the temperature change is detected (see FIG. 3).

Next, a specific operation will be described. While the heater is energized, the detected temperature change is three times as shown in FIGS.
Check every 0 seconds. Here, if the temperature sensor 7 comes off during the actual heating, the detected temperature continues to decrease although the oil temperature does not decrease, and the temperature change continues to detect (-) as shown in FIG. If four consecutive temperature changes (-) are detected,
At that time (two minutes after the first (-) was detected), it was determined that the temperature sensor had come off, and the microcomputer 11
Stop the energization.

On the other hand, if a large amount of oil is added while the heater is energized, the oil temperature once drops and the temperature sensor 7 follows the change, and the temperature changes to (-). The temperature of the hot water rises again, and the temperature sensor 7 also follows and rises, and the temperature change (+) is detected for the third time (90 seconds after the first (-) is detected) after the temperature change is detected (-). To detect. In such a case, it is determined to be normal.

[0020]

As described above, according to the present invention, even if oil is added during heating, the microcomputer can prevent the temperature sensor from being misjudged to be out of the temperature sensor and ensure safety while improving usability. It is.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic structure of a tempura range according to an embodiment of the present invention.

FIG. 2 is a block diagram of the control circuit.

FIG. 3 is a change diagram of a temperature detected by a temperature sensor.

FIG. 4 is a change diagram of a detected temperature of a temperature sensor (in a case where the temperature sensor is disconnected).

FIG. 5 is a change diagram of a detected temperature of the temperature sensor (when the temperature sensor is normal).

FIG. 6 is a diagram showing a conventional control means for detecting detachment of a temperature sensor.

FIG. 7 is a diagram showing another conventional example of control means for detecting a temperature sensor detachment.

[Explanation of symbols]

 2 heating source (heater) 3 pan 4 control element 5 control board 7 temperature sensor 11 microcomputer

Claims (1)

[Claims] 1. A pan (3) containing oil is placed on a heating source (2), and a temperature sensor (7) for detecting the oil temperature in the pan can be detachably attached to the pan (3). And a microcomputer (1) for controlling the heating amount of the heating source (2) by inputting the detected temperature of the temperature sensor (7).
1) is provided on the heating source side, and the microcomputer (11) has a program for judging whether or not the temperature sensor (7) is detached by determining whether the detected temperature rises again within a certain time after the detected temperature has dropped. Tempura range characterized by that.