JP2000297932A - Cooking device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To automatically control the temperature of oil and control heating safely, and it is required to determine the appropriate or extremely small amount of oil.
In order to improve the discrimination accuracy, one temperature information is not absolute and cannot be said to be absolute. SOLUTION: When judging an appropriate amount or an extremely small amount of oil when heating oil, after X minutes, Y minutes and Z
One minute later, the temperature from the temperature detecting means 15 is detected, and the microcomputer of the control means 19 calculates the level after X minutes and the level difference after Z minutes and Y minutes, and calculates the difference between the former level and the latter level. A temperature threshold value is selected based on the correlation, and heating control of automatic temperature control is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device using oil, and more particularly to a cooking device that determines whether the amount of oil is appropriate or extremely small, and controls heating by selecting a temperature threshold value corresponding thereto.

[0002]

2. Description of the Related Art Conventional heating cookers of this type are disclosed, for example, in JP-A-8-270957 and JP-A-58-270957.
There is the one disclosed in Japanese Patent No. 160738.

FIG. 10 is a configuration diagram of a main part of a heating cooker described in Japanese Patent Application Laid-Open No. 8-270975. In the figure, a heating means 1 such as an electric heater or a heating coil of an electromagnetic cooker, a heating vessel 2 to be heated by the heating means 1, and a temperature of the heat-resistant glass 3 for controlling a temperature of oil in the heating vessel 2 are detected. Temperature detecting means 4 to perform
And a control means 5 for controlling the amount of heat of the heating means 1 with the output of. The control means 5 controls the power of the heating means 1 to power down or OFF when the temperature detection means 4 detects the temperature threshold value T _A or more shown in FIG. it is obtained by heating control so as not to reach a high temperature threshold T _B than threshold T _a. Then, any chance, in which the temperature sensing means 4 automatically stops the heating means 1 and detects a temperature higher than the temperature threshold value T _B than temperature threshold T _A.

[0004] FIG. 12 is Japanese Patent Application Laid-Open No. 58-160738.
FIG. 1 is a configuration diagram of a main part of a heating cooker described in Japanese Unexamined Patent Publication (Kokai) No. H10-15095. In the figure, a heating means 1 such as a gas burner, a heating vessel 2 heated by the heating means 1, and a temperature detecting means 4 for detecting the temperature of the heating vessel 2 for controlling the temperature of oil in the heating vessel 2 are provided. , The output of the temperature detecting means 4 and the control means 5
The control means 5 includes a calculation unit 8 for determining the type of pot 6 and the cooking amount 7, and a correction unit 9 for correcting a difference from a standard value (oil temperature). And hot pot type 6
In FIG. 13, the temperature of the temperature sensor as the temperature detecting means 4 is detected 60 seconds after the start of heating in FIG. 13, and the microcomputer as the control means 5 calculates the temperature difference (Tb-Ta). Then, the difference between the temperature difference and the standard value (oil temperature) is calculated, and the temperature is corrected according to the magnitude of the temperature difference. Further, the temperature of the temperature sensor 4 for 20 seconds is detected again after the elapse of the heating, and the microcomputer 5 detects the temperature difference (Td).
-Tc) is calculated. Then, in the same manner as described above, the difference between the temperature difference and the standard value (oil temperature) is calculated, and the optimal heating control is performed by correcting the temperature according to the magnitude of the temperature difference.

[0005]

However, FIG.
The heating cooker of the former conventional example shown in FIG. 13 controls the heating of the output of the heating means 1 from the temperature threshold value T _A to the temperature threshold value T _B to maintain the heating properly. However, if the amount of oil is extremely small during oil heating, the oil temperature rises rapidly, so it is necessary to determine the oil amount in a short time from the start of heating and perform heating control according to the oil amount. I can't cope and it is bad.

[0006] The latter conventional heating cooker determines the amount of cooking to some extent, and is a case of heating cooking performance in which determination control is performed based on one piece of temperature information. On the other hand, in the case of the safe heating control, the determination of the oil amount must be absolute. Therefore, it is necessary to perform reliable discrimination control including variation in the temperature detecting means 4 and the configuration, a margin, and the like, and discrimination control based on one piece of temperature information is not absolute and is inconvenient.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention calculates the level after heating is started and the level difference after the start of heating by a microcomputer of the control means when controlling the temperature of the oil automatically and safely controlling the heating. The two types of information are correlated with each other to increase the certainty of the oil amount determination and selectively control the temperature threshold value according to the oil amount.

According to the above-mentioned invention, the temperature can be automatically adjusted to an appropriate amount or a very small amount at the time of oil heating control, so that ease of use and economical oil heating and safety can be ensured.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, when judging an appropriate amount or an extremely small amount of oil when the oil is automatically temperature-controlled and the heating is safely controlled, the temperature detecting means is used after X minutes, Y minutes and Z minutes after the start of heating. Temperature is detected by the microcomputer of the control means.
The level after minutes and the level difference between after Z minutes and after Y minutes are calculated,
The temperature threshold value is selected based on the correlation between the former level and the latter level difference, and the heating is controlled.

[0010] Since the oil heating can be continued even when the amount of oil is extremely small, the tempura oil can be heated while saving the amount of oil, so that it is economical, convenient, and safe because overheating can be prevented.

If the output of the heating means until Z minutes after the start of heating is A, and the outputs of the heating means at an appropriate amount and a very small amount after the oil amount discrimination control are B and C, then B> C and The output of the heating means is controlled in the relationship of B> A, and the heating control of automatic temperature control is performed even when heating is performed in an appropriate amount or a very small amount.

In contrast to the automatic temperature control when the oil amount is appropriate, the automatic temperature control can be performed with a performance close to the automatic temperature control when the oil amount is very small even when the oil amount is extremely small, so that it is easy to use and overheats. It is safe to prevent.

[0013]

1 to 7 show an embodiment of the present invention.
This will be described with reference to FIG.

(Embodiment 1) FIG. 1 is a block diagram of heating control of a heating cooker of the present invention, FIG. 2 is a conceptual diagram showing heating control,
3 is a sectional view of a main part, FIG. 4 is an external view, FIG. 5 is a characteristic diagram for explaining a method of heating control, FIG. 6 is a characteristic diagram for explaining a method of heating control, and FIG. It is principal part sectional drawing of the cooking device of an Example.

In FIG. 3, the cooking device is a heating vessel 10.
A stove section 14 formed of a heat-resistant glass 11 on which is mounted an infrared heater as a heating means 12 and a heat insulating material 13 having an open upper surface, and a temperature sensor as a temperature detecting means 15 It has. The temperature sensor 15 has its upper surface 16 in contact with the heat-resistant glass 11. At the center of the heat insulating material 13 of the stove section 14, the opening 1
7 and the temperature sensor 15 is located at the opening 17, and a heat insulating material is disposed between the opening 17 and the heat-resistant glass 11 as a heat suppressor 18 so that the radiant heat from the infrared heater 12 becomes appropriate. are doing. In addition, 19 is a control means.

In FIG. 4, the operation unit 20 includes a power supply start key 21, a power supply stop key 22, a heating start key 23,
A heating stop key 24, a temperature setting key 25, and the like are provided.
Then, as an operation, the energization start key 21 is pressed, and the tempura oil temperature is set with the temperature setting key 25 by input (usually 1 key).
(From 40 ° C. to 200 ° C.), and when the heating is started by pressing the heating start key 23, the infrared heater, which is the heating means 12 inside the stove section 14, generates heat and passes through the heat-resistant glass 11 immediately above, so that the heating vessel 10 such as a fryer pan is heated. It is heated by conduction heat and radiation heat.

Referring to FIG. 5, a description will be given of the performance of the heating control when the oil amount is appropriate and when the oil amount is extremely small (for example, 200 ml).

(1) If the oil amount is appropriate, the control means 19
When the temperature sensor 15 detects a temperature equal to or higher than the temperature threshold T2 with respect to the temperature thresholds T1 and T2 corresponding to the oil temperature set by the input, a signal is sent to the control means 19 and the infrared heater 12 Turn the output off or off. Thereafter, when the temperature sensor 15 detects a temperature equal to or lower than the temperature threshold value T1, the output of the infrared heater 12 is returned to full power or turned on. Thus, the temperature is automatically adjusted so that the oil temperature set by the input can be maintained. Generally, an appropriate amount means that the amount of oil in the heating vessel 10 is 800
It is between 1 ml and 1100 ml, and is clearly specified in the instruction manual for the product.

(2) When the amount of oil is extremely small, if heating is started at full power without controlling the output of the heating means 8 after the start of heating, the oil temperature rises rapidly and the temperature detected by the temperature sensor 15 decreases. The temperature of the temperature sensor 15 may far exceed the temperature threshold value T2 even if the control means 19 lowers or turns off the output of the infrared heater 12 because the temperature exceeds the temperature threshold value T2. At this time, the oil temperature also becomes high and sometimes 3
The temperature becomes close to 00 ° C, and evaporating oil smoke is generated, which is unsatisfactory. In other words, when the oil amount is extremely small, the temperature difference between the oil temperature and the temperature sensor becomes large, and the accuracy of the oil temperature temperature control is lacking.

[0020] By these things, not only at the appropriate amount,
In the case of an extremely small amount (for example, 200 ml), heating control corresponding to an appropriate amount or an extremely small amount of oil is required in order to automatically adjust the temperature and continue oil heating almost in the same manner as in the case of an appropriate amount. In particular, highly accurate discrimination control is required after the start of heating.

According to the present invention, the amount of oil is determined based on two types of temperature information, that is, the temperature and the temperature difference after the start of heating, and the temperature is controlled by selecting a temperature threshold value corresponding to an appropriate amount and an extremely small amount. . As shown in FIG. 2, after X minutes, Y minutes, and Z minutes after the start of heating, the temperature sensor 15 detects the temperatures T3 and T3.
4. Detect T5. At this time, the level of the microcomputer in the hexadecimal system of the control means 19 is calculated, and the level difference after X minutes and the level difference after Z minutes and Y minutes are calculated. Then, as shown in FIG. 1, the control means 19 after X minutes from the start of heating.
If the level of the microcomputer is equal to or greater than the predetermined threshold L, the oil amount is extremely large if the level difference after Z and Y minutes (Z−Y) is equal to or greater than the predetermined threshold M. The temperature thresholds T6 and T7 corresponding to an extremely small amount are determined, and if less than M, the oil amount is determined to be an appropriate amount and the temperature thresholds T1 and T2 corresponding to the appropriate amount are selected. further,
If the microcomputer level after X minutes after the start of heating is less than L, the oil amount is extremely small if the level difference between Z minutes and Y minutes (Z−Y) is equal to or greater than a predetermined threshold N. And the temperature thresholds T6 and T7 corresponding to an extremely small amount are selected, and if less than N, the oil amount is determined as an appropriate amount and the temperature thresholds T1 and T2 corresponding to the appropriate amount are selected.

The level of the microcomputer of the control means 19 is not less than L. One of the embodiments of this kind of the indirect detection type temperature sensor 15 of the present invention is as follows. Is equal to or less than L, and the level is equal to or greater than L when the amount is extremely small, so that this discrimination control is sufficient.
However, in consideration of variations in the temperature sensor 15 and the configuration, it is necessary to predict that the level at X minutes after the start of heating shows L or less at both an appropriate amount and a very small amount. Therefore, when the microcomputer level is equal to or higher than L, the level difference between after Z minutes and after Y minutes (Z−Y) is set to a large M value, and discrimination control is performed at M values or higher and below, and the microcomputer level is set to L or lower. At the time, the level difference between Z minutes and Y minutes (Z−Y) is small N
The value is determined as a value (a value smaller than the M value), and the discrimination control is performed at a value equal to or more than the N value. Thus, even if the temperature sensor 15 and the configuration vary, the discrimination control can be performed accurately.

That is, the level difference is M> N, and the temperature thresholds T1, T2> the temperature thresholds T6, T7.
That is, the temperature threshold is selected and the heating is controlled by relating the former level to the latter level difference. As a result, as shown in FIG. 6, even when the amount of oil is extremely small, overshoot accompanies, and although the performance is not as good as when the amount of oil is appropriate, the temperature is automatically adjusted so that the set oil temperature can be maintained. Heating can be continued.

Further, the calculation of the level in hexadecimal by the microcomputer of the control means 19 means that the voltage of a detection circuit (not shown) is detected by a change in the resistance value of the temperature sensor 15, and the level of the level is detected by the microcomputer of the control means 19. It is calculated and found.
Then, the temperature can be determined by determining the level, which is a very general method.

As described above, according to the present embodiment, the automatic temperature control when the amount of oil is appropriate is close to the automatic temperature control when the amount of oil is very small. It is easy to use and secures safety. Further, since the oil heating can be continued even when the amount of oil is extremely small, it is economical and convenient for the user because the tempura oil can be heated while saving the amount of oil.

Incidentally, the extremely small amount (for example, 200 ml) is described in the preventive affairs examination / inspection standard supervised by the Tokyo Fire Department.
There is a standard that the oil temperature is 300 ° C. or less at 0 ml or more, which means the amount of oil at this time. However, in this embodiment, by appropriately selecting a predetermined microcomputer level as the threshold value, control can be performed even when the minimum amount is 200 ml or less.

Next, the heating cooker described in the present embodiment is provided with an infrared heater 12 and a temperature sensor 15 below a heat-resistant glass 11 which transmits infrared rays. The temperature of the infrared heater 12 is as high as about 800 ° C., and in order to form the temperature sensor 15 in the vicinity of the infrared heater 12, the peripheral structure of the temperature sensor 15 that appropriately transmits the radiant heat from the infrared heater 12 is important. This is described below.

If the radiation heat from the infrared heater 12 is not sufficiently insulated, the radiation heat is transmitted too much to the temperature sensor 15 and the temperature sensor 15 detects a temperature slightly higher than the oil temperature. On the other hand, the oil temperature in the heating container 10 tends to be low. That is, the difference between the gradient of the temperature change of the oil temperature and the gradient of the temperature change of the temperature sensor 15 becomes large, and the true gradient of the temperature change cannot be detected, resulting in a malfunction. On the other hand, if the radiation heat insulation is too good, the temperature sensor 15
The temperature sensor 15 detects a temperature slightly lower than the oil temperature because the heat-resistant glass 11 in the portion indicated by No. is not heated by the infrared heater 12 and the heat conduction to the heat-resistant glass 11 from the high-temperature portion is small. Therefore, the oil temperature in the heating container 10 tends to be high with respect to the set temperature.
That is, the difference between the gradient of the temperature change of the oil temperature and the gradient of the temperature change of the temperature sensor 15 becomes large, and the true gradient of the temperature change cannot be detected, resulting in a malfunction. For this purpose, the infrared heater 1
2 by appropriately biasing the radiant heat from the temperature sensor 15
, The gradient of the temperature change of the oil temperature in the heating container 10 and the gradient of the temperature change of the temperature sensor 15 are approximated to improve the accuracy of the temperature control.

Next, another embodiment will be described.

In FIG. 7, the electromagnetic cooker 26 is provided with a heating coil as a heating means 28 and a temperature detecting means 29 below a heat-resistant glass 27 on which the heating vessel 10 is placed.
At this time, a temperature detecting means 29 is provided in the vicinity of the heating coil 28 of the electromagnetic cooker 26.
Since there is no significant influence of radiant heat, the temperature can be easily detected by the temperature detecting means 29. Reference numeral 30 denotes a control means, and the heating control is the same as that in the first embodiment.

According to the present embodiment, the heating can be controlled almost without being affected by the type of the pot.

(Embodiment 2) FIG. 8 is a conceptual diagram of the heating control of the heating cooker of the present embodiment, and FIG. 9 is a characteristic diagram for explaining a method of the heating control.

In the first embodiment, the temperature of the temperature sensor 15 is detected X minutes, Y minutes, and Z minutes after the start of heating.
The oil amount is determined based on two types of temperature information, temperature and temperature difference,
The heating amount is controlled by selecting a temperature threshold value corresponding to an appropriate amount of oil and a very small amount of oil. In the present embodiment, highly accurate performance is obtained by controlling the output of the infrared heater 12. . The configuration is the same as in the first embodiment.

As for the heating control, as shown in FIG. 8, the output of the infrared heater 12 from the start of heating to Z minutes after the start of the heating is represented by A, and after the oil amount discrimination control, the output of the heating means at an appropriate amount is represented by B. If the output of the heating means at a very small amount is C,
The output of the infrared heater 12 is controlled in the relation of B> C and B> A.

As a result, as shown in FIG. 9, the overshoot is reduced even when the amount of oil is extremely small, so that the temperature threshold value can be set to T even when the amount of oil is very small.
1, only T2 may be used. However, in order to obtain more accurate performance, it is necessary to provide temperature thresholds T1, T2 and T6, T7 corresponding to an appropriate amount and an extremely small amount of oil as in the case of the first embodiment, and select and control heating. It is possible. Then, the temperature is automatically adjusted so as to maintain the temperature set by the input as much as possible from an appropriate amount of oil to a very small amount of oil, thereby enabling highly safe oil heating.

As described above, according to the present embodiment, the automatic temperature control is performed with the performance close to the automatic temperature control when the oil amount is appropriate, even when the oil amount is extremely small. It can be used, is easy to use, prevents overheating and is safe.

The case where a temperature sensor is used as the temperature detecting means has been described. If the temperature sensor is a small, quick-response and highly reliable temperature sensor like a thermistor, it is used as the temperature detecting means. Means you can.

Although the case where an infrared heater is used as the heating means has been described, a halogen heater, a carbon heater,
A heater that emits a large amount of infrared light, such as a nichrome heater, is suitable as the heating means.

[0039]

As described above, according to the heating cooker of the present invention, the following effects can be obtained.

In the cooking device of the present invention, when judging an appropriate amount or an extremely small amount of oil when the temperature of the oil is automatically adjusted and the heating is safely controlled, the temperature detecting means is used after X minutes, Y minutes and Z minutes after the start of heating. And the microcomputer of the control means calculates the level after X minutes and the level difference between after Z minutes and Y minutes, and selects the temperature threshold value based on the correlation between the former level and the latter level difference. And heating control.

As a result, even if the amount of oil is extremely small, oil heating can be continued, so that the tempura oil can be heated while saving the amount of oil, so that it is economical, convenient, and safe because the overheating can be prevented.

If the output of the heating means until Z minutes after the start of the heating is A, and the outputs of the heating means at the time of the appropriate amount and the extremely small amount after the oil amount discrimination control are B and C, B> C and The output of the heating means is controlled in the relation of B> A, and the heating control of the automatic temperature control is performed even when heating is performed in an appropriate amount or a very small amount.

With this, the automatic temperature control can be performed with a performance close to the automatic temperature control when the oil amount is appropriate, even when the oil amount is an appropriate amount. Can be prevented and safe.

[Brief description of the drawings]

FIG. 1 is a block diagram of heating control of a heating cooker according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing heating control of the cooking device.

FIG. 3 is a sectional view of a main part of the cooking device.

FIG. 4 is an external view of the cooking device.

FIG. 5 is a characteristic diagram for explaining how to control the heating of the cooking device.

FIG. 6 is a characteristic diagram for explaining how to control heating of the cooking device.

FIG. 7 is a sectional view of a main part of a cooking device according to another embodiment.

FIG. 8 is a conceptual diagram of heating control according to the second embodiment of the present invention.

FIG. 9 is a characteristic diagram for explaining how to control the heating of the cooking device.

FIG. 10 is a sectional view of a conventional heating cooker.

FIG. 11 is a characteristic diagram for explaining how to control the heating of the cooking device.

FIG. 12 is a cross-sectional view of another conventional cooking device.

FIG. 13 is a characteristic diagram for explaining how to control the heating of the cooking device.

[Explanation of symbols]

 12 infrared heater (heating means) 15 temperature sensor (temperature detecting means) 19 control means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (reference) // H05B 6/12 335 H05B 6/12 335 F term (reference) 3K051 AA01 AC33 AD10 AD29 AD35 AD39 BD04 CD07 3L087 AA03 AB11 BB07 BC09 BC11 CA13 CB02 CB07 DA03 DA24 4B059 AA02 AA04 AB02 AE04 AE06 DA02 DA04 DA06 DA08

Claims (2)

[Claims] When judging an appropriate amount or an extremely small amount of oil during automatic temperature control of oil and safe heating control, the temperature is detected by temperature detecting means after X minutes, Y minutes, and Z minutes after the start of heating. , The level after X minutes, the level after Z minutes and Y
A heating cooker that calculates the level difference after minutes, selects a temperature threshold value based on the correlation between the former level and the latter level difference, and controls heating. 2. If the output of the heating means until Z minutes after the start of heating is A, and the outputs of the heating means at an appropriate amount and an extremely small amount after the oil amount discrimination control are B and C, B> C and B> A
The heating cooker according to claim 1, wherein the output of the heating means is controlled in relation to the above, and the heating from an appropriate amount to an extremely small amount is controlled.