JPH02290434A - Heating cooking apparatus - Google Patents

Abstract

PURPOSE:To prevent an article to be heated from rising at its temperature more than required due to OFF of a heat sources in case in which mounting of a temperature sensor dipped in an article to be heated in a pan is forgotten or the connection of a detachable part is disconnected during an operation. CONSTITUTION:If a mode of normally continuous heating is selected, the plug 23 of a temperature sensor 22 is removed from a jack 21, a switch 12 is turned ON, and an input to a halogen lamp 3 is regulated by switches 14, 15. When a tempura is fried in oil, the plug 23 is connected to the jack 21, the sensor 22 is set in a pan 24 filled with oil, a tempura mode is selected by a switch 16, and oil setting temperature is selected by a switch 17. When the switch 12 is closed, oil is held at the set temperature. If the plug 23 is not connected to the jack 21, an error is determined in cases of the disconnection of the sensor 22, connecting malfunction of the plug 23 to the jack 21, and the lamp 3 is not energized. Accordingly, a danger of raising oil to its igniting temperature can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [High Points of the Invention] (Industrial Application Field) The present invention relates to a cooking device that heats a pot containing an object to be heated using a heat source.

(Prior art) Conventionally, when heating an object to be heated, such as a pot containing a ura, using a heat source, a temperature sensor is immersed in oil and the temperature of the ura is detected by the temperature sensor while the heating source is turned on and off. It is thought that the oil in the pot can be kept within a predetermined temperature range by controlling the temperature of the oil in the pot. It is common to make it removable from the container body.

(Problem to be Solved by the Invention) However, if the temperature sensor is removable, it may be possible to forget to replace the temperature sensor when heating a pot containing oil, or to replace the temperature sensor. It is also possible that the oil comes off mid-way, the electrical connection is incomplete, or the temperature sensor element is disconnected, and in such cases, the oil temperature will not be maintained within the specified temperature range. However, there is a drawback that the temperature of the oil becomes higher than necessary and is heated to the ignition point.

Therefore, it is an object of the present invention to prevent the temperature sensor from being damaged when the user forgets to attach the temperature sensor, or when the temperature sensor comes off during the installation process, the electrical connection is incomplete, or there is a disconnection failure in the temperature sensor element. To provide a heating cooker which can prevent the temperature of a heated object from becoming higher than necessary and can notify a user in such a case.

[Structure of the Invention (Means for Solving the Problems) The TSL means of the present invention heats a pot containing an object to be heated using a heat source provided in the cooking device main body.
A temperature sensor immersed in the object to be heated in the pot is removably provided in the cooking device main body, and a control circuit is provided for controlling the heating source based on temperature information obtained by the temperature sensor, the control circuit has a detection means for detecting the state of a detachable part between the temperature sensor and the cooking device main body, and when the heating source is turned on, the connection of the detachable part is severed by the detection means. The second means is characterized in that the control circuit prevents the turning-on operation of the heating source when this is detected. The apparatus is characterized in that it has a detection means for detecting the state, and turns off the heating source when the detection means detects that the connection of the detachable part is disconnected while the heating source is turned on. A third means is characterized in that the alarm is activated by the control circuit when the heating source is not turned on or turned off.

(Function) According to the first means described above, if you forget to attach the removable temperature sensor to the main body of the cooking device, this is detected and the heating source is prevented from turning on, so the temperature of the object to be heated increases. can be prevented from becoming higher than necessary.

According to the second means, when it is detected that the connection of the awn part is disconnected while the heating source is turned on, the heating source is turned off,
It is possible to prevent the temperature of the heated object from becoming higher than necessary.

Further, according to the third means, when the heating source is not turned on or turned off by the first or second means,
It is possible to notify the user.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 10.

First, as shown in FIG. 1, the electric cooking device main body 1 is formed into a flat rectangular box shape and is set on the top plate A of the cooking table, and the heating units 2 are arranged in two places on the left and right inside. has been done. As shown in FIG. 3, these heating units 2 have a plurality of heaters, that is, halogen lamps 3 as a heat source, sandwiched between upper and lower oblong insulators 4 and 5, for example, 4 each, and placed under the bottom of the heaters. The heat insulator 5 is fixed to the inner bottom surface of the main body 1 using a saucer 6. The upper surface of the upper insulating body 4 of each heating unit 2 is covered with a translucent top plate 7 made of a piece of heat-resistant glass or the like, and the top plate 7 is in close contact with the upper insulating body 4. The inside of the heating unit 2 is sealed.

The temperature inside this sealed heating unit 2, and therefore the ambient temperature of the halogen lamp 3, is detected by a thermostat 8 as temperature detection means. This thermostat 8 has a heat sensitive part 9 which is formed by disposing a metal rod (not shown) that expands and contracts according to temperature changes in a metal outer tube, and the ion Q is turned off by the expansion and contraction of the metal rod of this heat sensitive part 9. The heat sensitive part 9 is arranged inside the heating unit 2, and the switch part 10 is arranged outside the heating unit 2. Note that this thermostat 8 is designed to turn off at a temperature of 750° C. or higher.

Further, operation panels 11 are provided on the left and right sides of the front surface of the main body 1. On the left half of this operation panel 11, as shown in FIG. :A ``manpower upJ'' and ``input dow''
Each switch 14 and 15 of nJ and "tempura mode person/
Switches 16 and 17 for "off" and "oil temperature adjustment" are provided, as well as several light emitting diodes 18 for displaying the amount of human power applied to the halogen lamp 3, and a display for oil temperature and tempura mode. Light-emitting diodes 19,20 are provided for indicating occupancy/off. A jack 21 is provided at the rear left corner of the main body 1, to which a plug 23 of the temperature sensor 2 is removably connected. The pot 24 placed on the top plate 7 is provided with a holder 25 for holding the temperature sensor 22.

The various switches 12 to 15 and the light emitting diode 18 described above are connected to the operation panel 1 in a one-to-one relationship with each heating unit 2.
However, for convenience of explanation, only the left heating unit 2 operated by the switches provided on the left tenth part of the operation panel will be described below.

The electrical configuration of the control circuit that controls the heating unit 2 on the left side of this electric cooker is as shown in FIG. 4, and the four halogen lamps 3 of the heating unit 2 are connected in parallel to the power source 26. The three groups of halogen lamps are controlled to be turned on and off by a microcomputer 27.

The microcomputer 27 controls various electrical parts that the electric cooking device main body 1 controls, and receives signals from the thermostat 8, various switches 12 to 17, the temperature sensor 22, etc., and responds to the input signals. The light emitting diodes 18 to 20 are turned off, and the
Triax 28 connected in series with 3 groups of logen lamps
The 3 groups of /X halogen lamps are controlled to be energized and de-energized by on/off control via the drive circuit 30, and the output (heat amount) of the halogen lamps 3 during the energization period is controlled by the triax 28. This is done through phase control.

This temperature sensor 22 has a resistor 32 connected to the output of the constant voltage circuit 31.
is connected in series with the switching transistor 33 to give its partial voltage to the A-D converter section 27a of the microcomputer 27. However, when the ambient temperature exceeds 90°C, the switching transistor 33
By turning on the resistor 34 and connecting the resistor 32 and the resistor 34 in parallel, the detection temperature range is expanded by lTP1. In this case, the resistor 32 is set to 100kΩ, and the resistor 34 is set to 3kΩ.
It is set to Ω.

For example, a thermistor with negative temperature characteristics as shown in FIG. 7 is used as the temperature sensing element of the temperature sensor 22, but this has a resistance of 375 kΩ when the ambient temperature is 20°C,
It is set to 975kΩ when the temperature is ℃.

The main flowchart of the microcomputer 27 is shown in FIG.

Next, the operation of the above configuration will be explained. First, when performing normal continuous heating of the object to be heated, that is, when selecting "continuous heating mode", remove the plug 23 of the temperature sensor 22 from the jack 21 and turn on only the "person" switch 12. let In this case, the human power applied to the halogen lamp 3, which is the heating source, is adjusted by operating the switches 14 and 15, and the adjusted state is displayed on the light emitting diode 18. When the "continuous heating mode" is selected in this way, the microcomputer 27 operates (a), (b), (
It operates so that the halogen lamp 3 is continuously energized through steps H) and (T). When this "continuous heating mode" is selected, if the plug 23 of the temperature sensor 22 is connected to the jack 21, in step (H)
It was determined to be YJ and an "error" occurred, and the halogen lamp 3
Turn off. Also, if the plug 23 of the temperature sensor 22 is connected to the jack 21 during continuous heating, it will be determined that rYJ is present in step (H), as described above.
Error.”

Next, when frying tempura using Ura as the object to be heated, the "humidity control mode" using the temperature sensor 22 is selected.
(Tempura mode) is selected, and the effect in this case will be described below. First, connect the brag 23 to the Ja Sok 21 and place the temperature sensor 22 in the holder 2 of the pot 24 containing oil.
Set to 5.

Next, use the switch 16 to select "Tempura mode" so that the light emitting diode 20 lights up, and use the switch 17 to set the temperature of the ura (160°C or 180°C).
Select the light emitting diode 1 corresponding to the selected temperature.
9 is lit, and in this state, press the "ON" switch 12.
Turn on. Then, when the microcomputer 27 moves from step (a) to step (b), rYJ
Judging that this is the case, proceed to step (c). When the plug 23 is not connected to the jack 21, the microcomputer 27
Since the resistance between a-+ and the human power terminal 27a-2 is infinite, the voltage of the human power terminal 27a-2 becomes equal to that of the human power terminal 27a4, but such a state is caused by the temperature of the thermistor shown in FIG. According to the characteristics, this is a case where the ambient temperature is much lower than 0°C, so when moving to this step (c), the microcomputer 27
By determining whether the signal given to a is below 0° C., it is possible to determine whether a sensor is inserted into the jack. If rYJ is determined in this step, the process moves to step (work), but the temperature sensor 2
If you forget to attach the plug 23 of No. 2 to the jack 21,
It is judged as NJ, an "error" occurs, and the halogen lamp 3 is not energized.

The "person" switch 12 is not activated by an instantaneous ON operation, but is enabled and activated if the ON operation is continued for 700 ms, for example. A buzzer 35 as an alarm is connected to the microcomputer 27 via a drive circuit consisting of a transistor 34, and as shown in FIG. 7(')Om to be activated
After s elapses, the ringing stops +F. be done. Therefore, it is sufficient to confirm that the buzzer 35 has stopped sounding and then finish the ON operation. Then, steps (a) and (c) above are performed by buzzer 3.
This is done based on the completion of the ringing in step 5. r in step (c)
When it is determined that it is YJ, the halogen lamp 3 is turned on. In addition, for the position judged as "N" in step (c), after the above-mentioned 700 ms ringing is completed, the same Fig. 6 (b)
As shown in the figure, the alarm rings and stops five times in succession at intervals of 80 ms to notify the user of the abnormal condition, and the halogen lamp 3 is not energized. This notification of an abnormal state is performed in the same way even if an "error" occurs in any step.

In either case, as mentioned above, if you forget to attach the plug 23 to the jack 2], or if the temperature sensor 22 is disconnected or the plug 23 is poorly connected to the jack 21, the A-D converter section of the microcomputer 27 Since the states of the signals applied to the terminals 27a are the same, a determination is also made in step (c) whether the temperature sensor 22 is disconnected or the plug 23 is poorly connected to the jack 21.

The abnormal state described above when the switch 12 is turned on is determined in step (c), but subsequent abnormal states are also determined in steps (h) and (c) in accordance with step (c). Based on the judgment made in these steps, it is possible to determine whether the plug 23 has come off from the jack 21 while the pot 24 is being heated, in addition to the above-mentioned abnormal condition, and in such a case, steps (c) and ( h), (sa) rN
J is determined, an "error" occurs, and the halogen lamp 3 is turned off.

When 4 minutes have elapsed after turning on the halogen lamp 3 in step (E), the process moves from step (E) to step (force), and the temperature detected by the temperature sensor 22 is higher than or equal to the first set temperature, that is, 45°C. This temperature is determined based on the transition of the detected temperature when the temperature sensor 22 is normally attached to the w424. 8th
The characteristic curve shown in the figure shows the oil temperature when the room temperature is 5°C, the oil content is 120% of the rated capacity of the pot 24, and the power supply voltage is 95% of the rated capacity, that is, the temperature of the oil in a state where the temperature increase rate generally considered is the lowest. This shows the relationship between and the temperature detected by the temperature sensor 22.
Temperature sensor 2 when 4 minutes have passed after starting electricity under this condition
Since the detected temperature of No. 2 is 50°C, if the temperature sensor 22 is properly attached when 4 minutes have passed after the start of electricity supply to the halogen lamp 3, the temperature will definitely be 50°C or higher. When the temperature does not reach 45°C, which is 5°C lower, it is determined that there is some kind of abnormality in the mounting state of the temperature sensor 22, and if the determination is rNJ, it is an "error".
As a result, the halogen lamp 3 is turned off.

This step (force) is 4 after energizing the halogen lamp 3.
After minutes have elapsed and it is determined that the temperature is rYJ in step (e), thinning is continued until it is determined that the set temperature has been reached (rYJ) in step (ke). That is, the temperature change from the time when 4 minutes have passed after the start of electricity supply to the halogen lamp 3 until the time t1 when the temperature detected by the temperature sensor 22 reaches the set temperature T (the oil temperature is 160°C or 180°C) is as follows. As shown in Figure 10, the temperature is always 45°C or higher, so if the temperature drops to 45°C or lower during this period, it is determined that there is some abnormality in the aging state of the temperature sensor 22, and the judgment cannot be made. When rNJ occurs, an "error" occurs and the halogen lamp 3 is turned off.

In step (g), it is determined whether 12 minutes or more have passed since the halogen lamp 3 was energized.

This step (g) is continued until rYJ is determined in step (k). This 12 minutes is
It is determined based on the transition of the detected temperature when the temperature sensor 22 is normally attached to the pot 24. That is, the characteristic curve shown in FIG. 9 shows the condition when the room temperature is 5°C, the amount of oil is 120% of the rated capacity of the pot 24, and the power supply voltage is 95% of the rated capacity, that is, the state where the temperature rise rate generally considered is the lowest. This shows the temperature of the oil at the time of 11 minutes and 30 minutes after starting electricity under these conditions.
Since the oil temperature reaches the set temperature (160°C) after seconds have passed, if the temperature sensor 22 is in a normal condition when 12 minutes have passed after the start of energization, it should definitely reach 160°C or higher. If the set temperature is not reached even after 12 minutes have passed after the start of energization, it is determined that there is some kind of abnormality in the aging state of the temperature sensor 22, and the determination is rNJ.
When this happens, an "error" occurs and the halogen lamp 3 is turned off.

In step (T), it is also determined whether 12 minutes or more have passed since the halogen lamp 3 was energized.

12 minutes from the set temperature (160°C) when the room temperature is 35°C, the amount of oil is 80% of the rated capacity of the pot 24, and the power supply voltage is 120% of the rated value, that is, when the temperature rise rate generally considered is the highest. Even if the oil is heated continuously, the temperature of the oil is 340°C, which does not reach the ignition temperature of 370°C, so the temperature sensor 22
Even if there is some abnormality in the mounting state of the oil, if continuous heating for 12 minutes is detected and the halogen lamp 3 is turned off, the oil will not reach the ignition temperature.

When it is determined in step (k) that the temperature detected by the temperature sensor 22 has reached the set temperature T at time t1, the process moves to step (k), and the temperature detected by the temperature sensor 22 reaches the second temperature.
It is determined whether the temperature is higher than the set temperature, that is, 110°C. When the temperature sensor 22 reaches the set temperature T at time t, the temperature change when the temperature sensor 22 is normally attached is always 110°C or more as shown in FIG. When the temperature falls below 110°C, it is determined that there is some abnormality in the mounting state of the temperature sensor 22, and when the determination is rNJ, an "error" occurs and the halogen lamp 3 is turned off.

If it is judged as rNJ in step (S), the halogen lamp 3 is turned on in step (S), and if it is judged as "Y", the /\ halogen lamp 3 is turned off in step (C).
As a result, the oil in the pot 24 is maintained at a predetermined temperature set by the switch 17.

Although not described in the flowchart of the microcomputer 27, when the "off" switch 13 is operated,
Regardless of whether "continuous heating mode" or "temperature control mode" is selected, the halogen lamp 3 is turned off after steps (H), (E), (KE), and (S) are performed, for example. .

As described above, according to the present embodiment, if you forget to connect the plug 23 of the temperature sensor 22 to the jack 21 and operate the switch 12 while selecting the alone mode, the rNJ When this is determined, an "error" occurs and the halogen lamp 3, which is the heating source, is not turned on. In addition, even if the plug 23 of the temperature sensor 22 is attached to the jack 21, it may come off during heating, or if a malfunction occurs such as incomplete electrical connection or disconnection of the temperature sensing element of the temperature sensor 22, the step (c), step (c),
ill judged as rNJ in any step (sa)
This will cause an "error" and the halogen lamp 3, which is the heating source, will be turned off to prevent the temperature of the heated object from becoming higher than necessary, and there is a risk that the temperature of the oil will rise to the ignition point. It is possible to avoid such situations, and
In such a case, the user can be notified by the buzzer 35.

FIG. 11 shows another embodiment of the present invention, in which a jack 21 has two contacts 21a and 2l that contact a plug 23.
One of the contacts 21a is biased in the direction of arrow G by a spring 21c. For this,
FIG. 11 shows the plug 23 removed from the jack 21 (
In the state shown in b), the contacts 21a. 21b are short-circuited, and the resistance value between them becomes OΩ. In the embodiment described above, the human power terminals 27a and 27 of the A-D converter section 27
When the resistance between a and 2 is infinite, step (c)
The halogen lamp 3 is turned off by determining rNJ in each of . and 27
If the halogen lamp 3 is turned off by determining rNJ in steps (C), (C), and (S) when the resistance between A and 2 is 0, the same effect as in the above embodiment can be obtained. .

[Effects of the Invention] As is clear from the above description, according to the first means of the present invention, when a removable temperature sensor is forgotten to be attached to the main body of the cooking device, this is detected and the heating source is switched on. According to the second means, the connection of the detachable part is cut off while the heating source is turned on. 'G is detected, the heating source can be turned off to prevent the temperature of the heated object from becoming higher than necessary; When the heating source is not turned on or turned off by the means,
This has an excellent effect of being able to notify the user.

[Brief explanation of drawings]

1 to 10 show an embodiment of the present invention,
Fig. 1 is a partially cutaway perspective view, Fig. 2 is an enlarged front view of the operation panel, and Fig. 3 is a section III-III of Fig. 1.
4 is an electrical configuration diagram of the control circuit, FIG. 5 is a flowchart of the control circuit, FIG. 6 is a timing chart, and FIGS.
The figure shows temperature characteristics, and FIG. 11 is a sectional view showing another embodiment of the present invention. In the drawing, 1 is the heating cooker body, 3 is a halogen lamp (heat source), 21 is a jack, 22 is a temperature sensor, 23 is a plug, 24 is a pot, 25 is a holder, 27 is a microcomputer, 35 is a buzzer (alarm) It is.

Claims (1)

[Scope of Claims] 1. In a device that heats a pot containing an object to be heated using a heat source provided in the cooking device main body, a device that is removably installed in the cooking device main body and is connected to the object to be heated in the pot. The control circuit includes a temperature sensor to be immersed and a control circuit that controls the heating source based on temperature information obtained by the temperature sensor, and the control circuit controls the state of the attachment/detachment portion between the temperature sensor and the cooking device main body. and a detection means for detecting that the heat source is turned on, and when the detection means detects that the connection of the detachable part is disconnected when the heat source is operated to turn on, the heat source is prevented from turning on. A heating cooker featuring: 2. In a device that heats a pot containing an object to be heated using a heat source provided in the cooking device main body, a temperature sensor that is removably installed in the cooking device main body and immersed in the object to be heated in the pot; , a control circuit that controls the heating source based on temperature information obtained by the temperature sensor, and the control circuit includes a detection means that detects a state of a detachable portion between the temperature sensor and the cooking device main body. 1. A heating cooking device comprising: a heating cooker, wherein the heating source is turned off when the detection means detects that the connection of the detachable portion is disconnected while the heating source is turned on. 3. The cooking device according to claim 1 or 2, wherein the control circuit according to claim 1 or 2 activates the alarm when the heating source is not turned on or turned off.