JP2003310433A - Keep-warm pot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keep-warm pot which prevents boiling over and the lack of heating without providing an additional temperature detecting means. <P>SOLUTION: A heating coil 16 stops heating a pot 11 when water reaches a full boil. When a temperature difference between a temperature detected by a temperature sensor 21 on this occasion and a temperature detected after a specified time is larger than a predetermined value, subsequent heating for the pot 11 is increased. Adversely, when the temperature difference is smaller than a predetermined value Ta, Tb, subsequent heating for the pot 11 is stopped or decreased. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-retaining pot in which a pot itself containing rice or water generates heat, and particularly by improving the accuracy of boiling detection by using a temperature detecting means of the pot, spillage or insufficient heating of rice. The present invention relates to a heat-retaining pot that prevents rice from being cooked deliciously.

[0002]

Conventionally, in this type of heat insulation cooker, when rice cooking is started, the rice in the pan is soaked in water, and then this water is boiled to 100 ° C. and boiled for a predetermined time (for example, 20 ° C.).
Min) Keep it to remove excess water from the rice and automatically keep it warm. On the other hand, in recent years, the heat-retaining pots have been downsized because they do not take up space. Therefore, until the boiling, the pan is heated with the maximum heating amount that the warming pot has, but when the boiling is detected, the heating of the pan is suppressed to a heating amount that allows the water in the pan to maintain 100 ° C. This is because the maximum heating may cause spillage.

[0003] However, in a warming pot in which the pot itself generates heat, such as an IH (electromagnetic induction heating) type warming pot, if the maximum heating is performed until it reaches boiling, only the temperature of the pot becomes high, and Since the temperature and the temperature of the rice in the pan go different,
When temperature detection such as boiling is performed only by the temperature detection means in contact with the pan, there is a problem that the rice in the pan cannot be heated sufficiently or the heating in the pan is too strong and spills.

Further, in order to prevent such a problem, a lid temperature detecting means is provided on the lid covering the pot separately from the pot temperature detecting means, and the vapor generated from the object to be heated in the pot by the lid temperature detecting means. There is also known one that detects a temperature to detect boiling. However, since the lid is provided with an extra lid temperature detecting means, the manufacturing cost is increased, and moreover, the wiring of the lid temperature detecting means has to be routed to a movable part such as an opening / closing lid. There was a problem that many failures occurred due to problems such as the above and disconnection of wiring in the movable part.

Further, in the IH type warming pot and warming jar, the temperature of the lid cannot be kept constant at the time of warming only by the temperature detecting means of the pot, and the temperature of the lid is lower than the rice temperature in the pot. For example, dew adheres to the lid and the rice becomes sticky. Conversely, if the temperature of the lid is higher than the temperature of the rice in the pan, the rice will dry. If the lid temperature detecting means as described above is provided in order to prevent this, there arises a problem that the manufacturing cost rises and more failures occur.

In view of the above problems, the present invention is directed to a case where the pan itself generates heat by the heat generating means, and the temperature detecting accuracy of the pan is used to improve the temperature detecting accuracy, thereby eliminating the unnecessary temperature detecting means. The first purpose is to cook savory rice by preventing spillage and insufficient heating without provision.

The second object of the present invention is to keep the temperature of the lid constant by using the temperature detecting means of the pan so that delicious rice can be held for a long time without providing any extra temperature detecting means. It is in.

[0008]

In the warming pot according to claim 1 of the present invention, the heating of the pot by the heat generating means is temporarily stopped so that the temperature detected by the pot and the rice contained in the pot can be increased. The internal temperature can be made uniform, and the temperature detection accuracy of the temperature detection means thereafter becomes high. Further, since the temperature detection accuracy of the temperature detection means is increased, it is possible to provide an inexpensive heat insulation pot with less malfunction.

If the temperature difference between the pan and the inside of the rice becomes large, such as when the amount of cooked rice is large, the temperature detected by the temperature detecting means at the time when the heating of the pan is stopped and the temperature detected after a certain period of time. However, in this case, the heating of the pot after a certain period of time is increased to prevent insufficient heating of the rice. Conversely, when the amount of rice cooked is small and the temperature difference between the pan and the inside of the rice becomes small, the temperature between the temperature detected by the temperature detection means when heating to the pan is stopped and the temperature detected after a certain time has passed. Although the difference becomes small, in that case, the heating to the pot after a certain period of time is stopped or reduced, so that spillage can be prevented.

In the warming pot according to claim 2 of the present invention, when the temperature difference between the pan and the inside of the rice becomes large, such as when the amount of cooked rice is large, the temperature detected by the temperature detecting means at the time when the heating of the pan is stopped. Then, the temperature difference from the detected temperature after a certain period of time increases and the rate of decrease in the detected temperature increases, but at this time the heating of the pan continues for a certain period of time, so the detected temperature of the pan and the pan The temperature inside the rice stored can be made uniform, and the temperature detection accuracy of the temperature detection means thereafter becomes high. Further, since the temperature detection accuracy of the temperature detection means is increased, it is possible to provide an inexpensive heat insulation pot with less malfunction. Further, in this case, the amount of heat before heating is increased to be equal to or more than that before heating, and the heating of the pan is restarted, so that insufficient heating of the rice can be prevented.

On the contrary, when the amount of cooked rice is small and the difference in temperature between the pan and the inside of the rice becomes small, the temperature detected by the temperature detecting means at the time when the heating of the pan is stopped and the temperature detected after a certain period of time. However, in that case, when the rate of decrease in the detected temperature becomes less than the specified value, the heating of the pan is restarted immediately, and the cooking time can be shortened. The heating stop can be minimized. Further, after the heating is restarted, the heating amount is made smaller than that before the heating is stopped and the heating of the pan is restarted, so that the spilling can be prevented.

In the warming pot according to the third aspect of the present invention, the heating of the pot by the heat generating means is temporarily stopped so that the temperature detected by the pot and the temperature inside the rice contained in the pot are made uniform. Therefore, the temperature detection accuracy of the temperature detection means thereafter becomes high. Further, since the temperature detection accuracy of the temperature detection means is increased, it is possible to provide an inexpensive heat insulation pot with less malfunction.
Furthermore, it is possible to optimize the amount of heating to the pot after that according to the temperature difference between the temperature detected by the temperature detecting means when the heating of the pot is stopped and the temperature detected after a certain period of time. It can prevent insufficient heating of rice and spillage.

In the warming pot according to claim 4 of the present invention, when the temperature difference between the pan and the inside of the rice becomes large, such as when the amount of cooked rice is large, the temperature detected by the temperature detecting means at the time when the heating of the pan is stopped. Then, the temperature difference from the detected temperature after a certain period of time increases and the rate of decrease in the detected temperature increases, but at this time the heating of the pan continues for a certain period of time, so the detected temperature of the pan and the pan The temperature inside the rice stored can be made uniform, and the temperature detection accuracy of the temperature detection means thereafter becomes high. Further, since the temperature detection accuracy of the temperature detection means is increased, it is possible to provide an inexpensive heat insulation pot with less malfunction.

Further, in accordance with the temperature difference between the temperature detected by the temperature detecting means at the time when the heating of the pot is stopped and the detected temperature after a fixed time, the amount of heating to the pot after that is optimized. It is possible to prevent insufficient heating of rice and spillage.

On the contrary, when the amount of cooked rice is small and the temperature difference between the pan and the inside of the rice becomes small, the temperature detected by the temperature detecting means at the time when the heating of the pan is stopped and the detection after a certain period of time have passed. The temperature difference from the temperature will be small, but in that case, when the rate of decrease in the detected temperature becomes less than the specified value,
Since the heating of the pan is restarted immediately, the cooking time can be shortened and the stoppage of heating can be minimized. Further, after the heating is restarted, the heating amount is made smaller than that before the heating is stopped and the heating of the pan is restarted, so that the spilling can be prevented.

According to a fifth aspect of the present invention, in the heat-retaining pot, the heat-controlling means operates in conjunction with the heating pattern selected by the heat-generating means, even when the temperature is kept, even when the outside air temperature or the input voltage is affected.
Since the lid control means selects a heating pattern that optimizes the amount of heating to the lid body, the temperature of the lid body with respect to the pan can be kept substantially constant only by the temperature detection means. Therefore, delicious rice can be held for a long time.

Further, it is not necessary to provide another temperature detecting means on the lid body, and it is possible to eliminate a defect that an extra lead wire wired from the other temperature detecting means is broken or manufacturing becomes difficult. In addition, it is possible to provide an inexpensive heat-insulating kettle with few failures.

According to the sixth aspect of the present invention, the heat generating means is adjusted based on the information from the voltage detecting means so that the electric power supplied to the heat generating means becomes constant. Therefore, the same amount of heating can be applied to the pan during rice cooking and heat retention without being affected by fluctuations in the input voltage.

Further, when the temperature is kept warm, the lid control means optimizes the amount of heat applied to the lid body even in the case of being affected by the outside air temperature, the input voltage, etc., in association with the heating pattern selected by the heat generation control means. Select a heating pattern. Moreover, since the lid control means optimally variably adjusts the heating amount of the heating pattern for the lid heating means in accordance with the input voltage from the commercial power source, the lid for the pan is irrespective of the fluctuation of the input voltage only by the temperature detecting means. The body temperature can be kept more stable and almost constant. Therefore, even if the heating means is adjusted, delicious rice can be held for a long time.

Further, it is not necessary to provide another temperature detecting means on the lid body, and it is possible to eliminate the troubles such as the failure of an extra lead wire wired from the other temperature detecting means or the difficulty of manufacturing. In addition, it is possible to provide an inexpensive heat-insulating kettle with few failures.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a heat retaining pot according to the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a heat-retaining pot main body which is an outer shell of the heat-retaining pot. The heat-retaining pot main body 1 includes a substantially cylindrical outer frame 2 forming a body and an opening on the lower surface of the outer frame 2. It is formed by the bottom plate 3 provided so as to cover it. A lid 5, which is a lid body that is openable and closable by a hinge spring 4 as an elastic member located at the rear portion, is provided on the upper portion of the warming pot main body 1. In addition, a substantially cylindrical pot accommodating portion 6 formed by being integrally hung from an upper inner peripheral portion of the outer frame 2 and an inner frame 8 provided so as to cover a lower surface opening of the pot accommodating portion 6 will be described later. Pot
An outer tank portion 9 which is cylindrical and has a bottom and which houses 11 is made of a non-magnetic material.

In the outer tub 9, a bottomed cylindrical inner pot, ie, a pot 11 for containing a substance to be heated such as rice and water is detachably accommodated. The pot 11 is joined to the pot main body 12 as a heat conducting portion mainly made of aluminum having good heat conductivity, from the lower side surface to the bottom portion of the outer surface of the pot main body 12,
It is composed of a heating element 13 as an induction heating section made of a magnetic material such as magnetic stainless steel or a steel plate. The reason why the heating element 13 is not provided from the center of the side surface of the pan 11 to the upper part is to reduce the weight of the pan 11. Further, an annular flange portion 14 extending to the outer peripheral side is formed around the upper end of the pot 11.

The inner frame 8 forming a part of the outer tank portion 9 is
The inner frame 8 is located facing the heating element 13 of the pan 11.
Heating coils 16 as heating means for heating the pan 11 by electromagnetic induction are provided on the lower side surface and the bottom surface of the outer surface facing the heating element 13. Heating coil 16 pan 11
It is arranged so as to keep a substantially constant distance from the heat generating part of, and is formed by a plurality of element wires of φ 0.5 mm or less. At least three ferrites 17 are provided under the heating coil 16.
Are arranged in a radial direction from the center of the pot 11 so that the magnetism is not leaked to the outside of the heat retaining pot body 1. Then, when a high frequency current is supplied to the heating coil 16, the heating element 13 of the pot 11 is heated by the alternating magnetic field generated from the heating coil 16, and the cooked item such as water or rice in the pot 11 is heated. It is like this.

Further, a temperature sensor 21 as a temperature detecting means for the pan 11 is arranged at the center of the bottom of the inner frame 8 so as to elastically contact the outer surface of the bottom of the pan 11, and detects the temperature of the pan 11. It is supposed to do. The temperature sensor 21 is composed of a thermistor and is held together with the ferrite 17 by a ferrite cover 22 made of a non-magnetic material. By disposing the ferrite cover 22 at the bottom of the inner frame 8, the heating coil 16 is also pressed down, and when the current flows through the heating coil 16, the heating coil 16 is prevented from vibrating due to the current. . Reference numeral 23 is a thermal fuse provided near the temperature sensor 21.

The structure of the ferrite cover 22 and its surroundings will be described with reference to FIGS. 2 and 3. The ferrite cover 22 includes a cup portion 26 that covers the tubular wall portion 25 formed on the outer bottom surface of the inner frame 8 and a plurality of arm portions 27 that radially extend from the cup portion 26 along the outer bottom surface of the inner frame 8. Composed. A rod-shaped ferrite 17 is inserted into the arm portion 27, and a ferrite insertion portion 29 having an elastic claw 28 and a screw fixing portion provided corresponding to the screw hole boss 30 on the outer bottom surface of the inner frame 8 are provided. 31 are formed respectively. Further, on the outer bottom surface of the inner frame 8, in addition to the cup portion 26 and the screw hole boss 30, a pedestal 32 for defining the height of the ferrite 17 inserted in the ferrite insertion portion 29 is provided on each arm portion 27. Are formed corresponding to the ferrite insertion portions 29 of

When assembling, the base portion of the ferrite 17 is inserted from the tip end side of the ferrite inserting portion 29, and the protrusions 18 formed on the ferrite 17 are overcome to elastically restore the claws 28 of the ferrite inserting portion 29. As a result, the claw 28 of the ferrite insertion portion 29 engages with the protrusion 18 of the ferrite 17 to prevent the ferrite 17 from coming off, and at the same time the ferrite 17
The protrusion 18 is pressed from below by the elasticity of the claw 28.

Next, the heating coil 16 is wound around the outer bottom surface of the inner frame 8 in advance, and the temperature sensor 21 and the temperature fuse 23 are attached to the inner frame 8 respectively. By covering the cup part 26 of the ferrite cover 22,
A ferrite cover 22 incorporating the ferrite 17 is attached to the outer bottom surface of the inner frame 8. At this time, the pedestal 32 protruding from the outer bottom surface of the inner frame 8 pushes the ferrite 17 against the elasticity of the ferrite cover 22, so that the relative position of the ferrite 17 to the inner frame 8, that is, the height of the ferrite 17 is increased. Fixed. When the ferrite cover 22 is attached to the inner frame 8, the screw fixing portion 31 of the ferrite cover 22 is aligned with the screw hole boss 30 of the inner frame 8. Therefore, when the screw 34 is inserted and tightened here, the screw 34 Due to the tightening margin, the ferrite cover 22 presses the heating coil 16, the heating coil 16 is fixed by the ferrite cover 22, and the ferrite 17 is also fixed to the ferrite cover 22. Further, since the cup portion 26 of the ferrite cover 22 presses the temperature sensor 21 and the temperature fuse 23 inside and outside the tubular wall portion 25, these temperature sensor 21 and the temperature fuse 23 are also accompanied by tightening the screw 34. And is fixed to the ferrite cover 22.

In this manner, the ferrite cover 22 which is a separate component allows not only the ferrite 17 but also the heating coil.
Since 16, the temperature sensor 21, and the temperature fuse 23 can be fixed at the same time, the number of parts can be reduced.
Also, the protrusion 18 of the ferrite 17 and the claw of the ferrite cover 22
The ferrite 17 can be removed from the ferrite insertion part 29 of the ferrite cover 22 by simply disengaging the ferrite 17, so that the recyclability of reusing the ferrite 17 is improved and the eco-friendly product is put on the market. Can be provided.

Returning to FIG. 1 again, the lid 5 is biased in the opening direction by the force of the hinge spring 4 wound around the hinge shaft 35 which is the rotation shaft thereof. Further, the hook 36 provided on the front upper side of the outer frame 2 engages with the front portion of the lid body 5 in a detachable manner, so that the lid body 5 is closed against the bias of the hinge spring 4. Hold the state. A brake spring 37 is provided on the rear portion of the lid 5 in addition to the hinge spring 4, and the elastic force of the brake spring 37 is used to open the lid 5 gently.

When the lid 5 is closed, the top opening of the pot 11 is closed by an inner lid assembly 39 provided inside the lid 5. The inner lid assembly 39 is detachably provided on the lower surface of the lid body 5 for easy cleaning and the like. On the outer side of the inner lid assembly 39, that is, on the upper side, a heat radiating plate 40 made of, for example, aluminum which is visible when the inner lid assembly 39 is removed is arranged. A lid heater 41 serving as a lid heating means for heating the radiator plate 40 and further the inside of the pan 11 is provided on the outer side of the radiator plate 40, that is, the inner lid via the radiator plate 40. Warm assembly 39 and pot
Heat the inside of 11.

The inner lid assembly 39 includes an inner lid 43 made of a metal material such as stainless steel or aluminum, a lid packing 44 provided on an outer peripheral portion of the inner lid 43 and sealing the periphery of the pot 11 by its elasticity. It is composed of a lid assembly 39 and a packing base 45 for fixing the lid body 5. The inner lid 43 and the packing base 45 are fixed to each other by screws, welding, or caulking, and the intervals are fixed at equal intervals. Also lid packing 44
Are fixed together by the inner lid 43 and the fixing portion of the packing base 45.

On the other hand, the lid 5 includes a heat radiating plate 40 as a lid lower surface material forming the lower surface of the lid 5, an outer lid 46 forming an upper outer shell, and the outer lid 46 and the heat radiating plate 40. And an outer lid cover 47 that forms a skeleton of the lid body 5 as main components. A steam port 48 for releasing steam generated in the pan 11 to the outside is detachably attached to the upper portion of the lid body 5.

At the front portion of the outer frame 2 which forms the body of the warming pot main body 1, an operation panel 51 is provided as an operation unit which can be directly touched by a user with a finger. Inside the operation panel 41, there is provided a control board 52 on which a microcomputer (not shown) as a control component for controlling the heating process of rice cooking and heat retention is mounted. In addition to the microcomputer, the control board 52 includes an LCD display 53, a plurality of push-button switches 54, an LED 55 as a light emitting element for displaying a process such as rice cooking, heat retention, and reserved rice cooking. Soldered together with the parts. The display unit 43 displays the current time, cooked time, reserved rice cooking time in segments by using the clock function of the microcomputer, and designates the selected rice cooking menu / course by symbols. Is located in. Also switch
The display 54 is arranged around the control board 52 so as to surround the display 53.

A unit case 61 is a holding member for holding the control board 52. The unit case 61 is made of resin and is attached and fixed to the front inside the outer frame 2. Further, below the control board 52, an inverter circuit 62 electrically connected to the control board 42 by a cable (not shown) is provided. The inverter circuit 62 supplies a high frequency current to the heating coil, and is configured by mounting a plurality of electronic components 64 on a heating substrate 63. Since the inverter circuit 62 is equipped with an electric component that generates heat, a radiator 65 having good thermal conductivity such as aluminum is provided below the standing heating substrate 63 so as to be in thermal contact with the heat generating component. Further, a cooling fan 66 for removing heat from the radiator 65 to cool the radiator 65 faces the exhaust hole 67 provided in the bottom plate 3, and
It is provided below 65.

The inverter circuit 62 and the cooling fan 66 are
It is fixed to a common resin case, that is, a unit case 67, whereby the cooling fan 66 and the radiator 65 are arranged with a constant distance. The unit case 67 in which the inverter circuit 62 and the cooling fan 66 are mounted is pressed when the bottom plate 3 is fixed to the warming-cup body 1, and is fixed inside the warming-cup body 1. In addition, a cord reel 68 for winding up a power plug (not shown) is provided inside the heat insulation pot body 1. Further, 69 is a rotatable handle for transportation which is provided so as to straddle both sides of the outer frame 2.

Next, the control system of the heat retaining pot of this embodiment will be described with reference to FIG. In the figure, reference numeral 71 is a control means comprising a microcomputer or the like, which is based on the temperature information from the temperature sensor 21 and which heats the pan 11 at the time of rice cooking and heat retention.
And a lid heater 41 for heating the heating plate 40 of the lid body 5 and, by extension, the inner lid 43. The control means 71 is provided with a cooking control means for controlling the cooking and heating of the object to be heated as a function on the control sequence of the program stored in its own storage means (not shown). A rice-cooking control means 72 for heating the object to be heated in the rice 11 and a heat-retention control means 73 for keeping the rice in the pan 11 at a predetermined heat-retention temperature during heat retention are respectively provided.

Reference numeral 75 is a heating coil drive means which receives a control signal from the control means 71 and which has a built-in high frequency inverter circuit for supplying a predetermined high frequency current to the heating coil 16. Separately from this, the output side of the control means 71 receives the control signal from the control means 71 and drives the lid heater 41 so as to heat the heat dissipation plate 40 and the inner lid 43.
76 is provided.

Further, the control means 71 receives commands from the rice cooking control means 72 and the heat retention control means 73, and controls the operation of the heating coil 16 and the lid heater 41 in accordance with the detection information from the temperature sensor 21. The lid heater control means 81 for adjusting the on / off cycle of the lid heater 41 and the heating coil 16 for performing electromagnetic induction heating based on the detection information from the temperature sensor 21 as well.
And a heating coil control means 82 for intermittently energizing.
Further, in the present embodiment, the voltage detection means 83 for detecting the voltage input from the commercial power source to each electrical component of the warming oven main body 1 is provided, and the heating coil 16 is energized based on the information from the voltage detection means 83. The heating coil control means 82 controls the current to the heating coil 16 so that the power to be supplied is constant.

Next, referring to FIGS.
This will be described with reference to FIG. Note that FIG. 5 shows each step of the rice cooking performed by the rice cooking control means 72 and the change in the detected temperature T of the temperature sensor 21 corresponding thereto. Further, FIG. 6 is a flowchart showing an operation procedure during rice cooking. Further, FIG. 7 is a graph showing the temperature T detected by the temperature sensor during heat retention and the heating patterns of the heating coil 16 and the lid heater 41.

The pot 11 containing a predetermined amount of rice and water is placed in the outer tank 9
Then, when the lid 5 is closed and the rice-cooking start switch 54 is pressed, the rice-cooking control means 72 performs the hot-water process C1 for a fixed time at the beginning of the series of rice-cooking processes. In the step C1, the heating coil 16 first heats the pot 11 for a predetermined time with a predetermined heating amount, and thereafter, the heating of the pot 11 is stopped and the pot 11 is heated.
Promote water absorption of rice inside. Along with that, rice cooking control means
72 determines the amount of cooked rice in the pan 11 based on the temperature difference ΔT 'between the temperature detected by the temperature sensor 21 at the start and the temperature detected by the temperature sensor 21 after a lapse of a certain time in this step C1. . Specifically, it is determined that the larger the temperature difference ΔT ', the smaller the heat capacity in the pan 11 and thus the amount of cooked rice, and the smaller the temperature difference ΔT', the larger the heat capacity in the pan 11 and thus the amount of cooked rice. It is a thing.

When the hot water cooking step C1 is completed, the process moves to a heating step C2 for raising the temperature of the water in the pan 11 to about 100 ° C. Pan from the heating coil 16 in this heating step C2
The amount of heating to 11 is optimally set according to the amount of rice cooked in the hot water cooking step C1. That is, when it is determined that the amount of cooked rice is large, the cooked rice control means 72 gives the pan 11 the maximum amount of heat that can be added by the heating coil 16. When the amount of cooked rice is medium, 90% of the maximum amount of cooked rice and when the amount of cooked rice is small, 50% of the maximum amount of cooked rice is given to pan 11. .

Then, as shown in step S1 of FIG. 6, when the temperature T detected by the temperature sensor 21 for the pan 11 reaches a predetermined value, for example, 90 ° C. (T ≧ 90 ° C.), the detected temperature T per a predetermined time tx is changed. Temperature increase rate Rx (= T
If x / tx) is equal to or lower than a predetermined value, that is, the temperature increase rate, the boiling detection step C2a for determining that boiling has started is started. The determined rate of temperature rise at this time is set based on the amount of cooked rice determined in the hot water cooking step C1. Specifically, when it is determined that the amount of cooked rice is small, tx = 90
When the degree of increase Tx of the detected temperature T becomes 2 ° C. or less in a second and when it is determined that the amount of cooked rice is large, tx =
When the degree of increase Tx of the detected temperature T becomes 2 ° C. or less in 210 seconds and when it is determined that the amount of cooked rice other than that is medium, the degree of increase Tx of the detected temperature T is tx = 180 seconds.
When the temperature falls below 2 ° C, it is judged that boiling has been detected. That is, as the amount of cooked rice in the pan 11 is larger, the heat capacity in the pot 11 is larger. Therefore, the temperature increase rate Rx of the detection temperature T for judging boiling is gentle, and conversely, the smaller the amount of cooked rice is,
Since the heat capacity in the pot 11 is large, the temperature increase rate Rx of the detected temperature T in determining boiling becomes steep.

When the boiling detection is completed in this way, the rice cooking control means 72 stops heating the pan 11 for a certain period of time (for example, 60 seconds), and indicates the degree Ty of decrease in the detected temperature T per predetermined time ty during this stop period. Temperature decrease rate R of detected temperature T
Measure y (= Ty / ty). Then, as shown in step S2 of FIG. 6, when the temperature decrease rate Ry becomes equal to or lower than a predetermined value (for example, 0.5 ° C. per 30 seconds) within a certain time, the process proceeds to the next stable cooking control step C3.

On the other hand, when the temperature decrease rate Ry does not become equal to or less than the determined value and 60 seconds which is a constant time has elapsed, the procedure goes to step S3, and the rice cooking control means 72
The detected temperature T at the time when the boiling detection ends and the heating of the pan 11 is stopped, and the current detected temperature T after the elapse of a certain time
And the temperature difference ΔT is calculated. The measured temperature difference ΔT is compared with the determined temperature difference ΔTa, and the measured temperature difference ΔT is equal to or less than the determined temperature difference ΔTa (ΔT ≦ ΔTa), and the stable cooking control step C3 is performed as it is.
Move to. If the measured temperature difference ΔT exceeds the determined temperature difference ΔTa (ΔT> ΔTa), then,
The measured temperature difference ΔT and another predetermined temperature difference ΔTb (however, the temperature difference ΔTb is larger than the temperature difference ΔTa) are compared. Here, if the measured temperature difference ΔT is less than or equal to the determined temperature difference ΔTb (ΔT ≦ ΔTb), the pot 11 is heated with a heating amount weaker than the boiling detection step Ca2 (90% heating amount in FIG. 6). After the above heating is added, the process proceeds to the stable cooking control step C3. If the measured temperature difference ΔT exceeds the determined temperature difference ΔTb (ΔT> ΔTb), the heating amount is the same as that in the boiling detection step Ca2 (100% heating amount).
Is added to the pan 11, and similarly, the process proceeds to the stable cooking control step C3.

When shifting to the stable cooking control step C3,
Rice cooking control means 72 reduces the heating amount from the heating step C2
Continue heating to 11. Then, when the water content in the pan 11 is exhausted and the detection temperature T further rises by a predetermined temperature, the cooking is detected and the process shifts to the next stripping step C4. During the purging process C4, the pan 11 is heated to such an extent that the rice in the pan 11 does not burn, and after a predetermined time has elapsed, the heat retention control means 73 shifts to heat retention.

In the heating step C2, a heating coil
The alternating magnetic field from 16 causes the heating element 13 of the pot 11 to generate heat, and the pot body 12 that is a heat conducting portion diffuses the heat to the entire pot 11,
Heat the rice and water contained in pot 11. At that time, for example, when the amount of rice cooked in the pan 11 is large and the distance from the heating element 13 or the pan body 12 to the inside of the rice is large, the detected temperature T of the temperature sensor 21 in contact with the outer surface of the pan 11 Since the temperature inside the rice is different, when the boiling is detected by the detection temperature T, if the heating to the pan 11 is temporarily stopped, the detection temperature T of the pan 11 including the heating element 12 and the rice The internal temperature can be made uniform, and the temperature detection accuracy of the temperature sensor 21 thereafter becomes high.

Further, as the amount of cooked rice increases, the temperature inside the rice relative to the pan 11 becomes lower, and the detection temperature T decreases remarkably during the heating stop period. In that case, the temperature decrease rate Ry falls below the predetermined value. Instead, the procedure proceeds to step S3 in FIG. On the contrary, when the amount of cooked rice is small, the distance between the heating element 12 of the pan 11 and the inside of the rice is not so large, and the detected temperature T of the pan 11 and the temperature inside the rice are almost the same. pot
Even if the heating to 11 is temporarily stopped, the detected temperature T does not suddenly decrease, and the temperature decrease rate Ry immediately becomes the predetermined value or less. Therefore, in this case, the pot 11
It is possible to immediately shift to the stable cooking control process from the end of the boiling detection in step S1 without stopping the heating for a certain period of time, and it is possible to shorten the cooking time by minimizing the heating stop.

When shifting to heat retention, the heat retention control means 73 causes the pan 11 to
The heating coil 16 and the lid heater 41 are turned on and off in a specific heating pattern through the heating coil control means 82 and the lid heater control means 81 so as to keep the temperature of the rice inside constant.

The operation of the heating coil control means 82 will now be described. As shown in FIG. 7, the detected temperature T of the temperature sensor 21 changes from the first temperature Tc (for example, 71 ° C.) to the first temperature Tc. Higher second temperature Td (eg 73 ° C)
Until the temperature rises to 1, the heating coil 16 is cut off by the first heating pattern PA. In addition, the second heating pattern in which the heating amount to the pan 11 is smaller than that in the first heating pattern PA until the temperature T detected by the temperature sensor 21 decreases from the second temperature Td to the first temperature Tc. The heating coil 16 is cut off by PA. Further, the temperature T detected by the temperature sensor 21 is the first
If the temperature becomes lower than the temperature Tc (for example, 69 ° C),
The heating coil 16 is turned off by the third heating pattern PC, which has a larger heating amount for the pan 11 than the first heating pattern PA.

On the other hand, focusing on the operation of the lid heater control means 81, the heating coil control means 82 uses the first heating pattern PA.
Alternatively, if the third heating pattern PC is selected and the heating coil 16 is turned off, the first heating pattern P
The lid heater 41 is turned off at α. On the other hand, the heating coil control means 82 selects the second heating pattern PB,
When the heating coil 16 is cut off, the lid heater 41 is cut off by the second heating pattern Pβ that heats the heating plate 40 of the lid 5 less than the first heating pattern Pα. To do.

In the control during such heat retention, for example, when the outside air temperature is low, the amount of heat radiated from the heat retention oven main body 1 increases, so that the heating coil control means 82 causes the first heating pattern PA and the third heating pattern PA. The time for selecting the pattern PC is relatively increased, and the heating amount for the pan 11 is increased. Along with that, the lid heater control means 81 also relatively increases the time for selecting the first heating pattern Pα, and the heating amount to the heat sink 40 increases. Therefore, in this case, even if the outside air temperature becomes low, dew condensation does not occur on the heat sink 40 or the like.

On the contrary, if the outside air temperature rises, the warming pot body 1
The amount of heat radiated from the pan decreases, and the time for the heating coil control means 82 to select the second heating pattern PB relatively increases, so the amount of heat to the pan 11 decreases. Along with that, the lid heater control means 81 also relatively increases the time for selecting the first heating pattern Pβ, and the heating amount to the heat dissipation plate 40 decreases. Therefore, in this case, the rice in the pan 11 will not dry even if the outside temperature rises.

When the voltage input from the commercial power supply (not shown) is low (for example, 90V), the heating amount for the pan 11 in the same heating pattern is for the pan 11 at the normal voltage (for example, 100V). Less than the heating amount of. At this time, although the heating amount to the lid heater 41 also decreases in association with the heating amount to the pan 11, the detected temperature T of the temperature sensor 21 is the first temperature Tc.
Since it takes a long time to rise from the temperature to the second temperature Td, the heating pattern Pα with a relatively large heating amount for the lid 5 is finally selected by the lid heater control means 81 to the lid 5. Condensation of dew condensation can be prevented.

On the contrary, when the voltage input from the commercial power source (not shown) becomes high (for example, 110V), the heating amount to the lid heater 41 increases in conjunction with the heating amount to the pan 11, but the temperature The time when the detection temperature T of the sensor 21 rises is shortened,
A large number of heating patterns Pβ with a relatively small heating amount to the lid 5 are selected by the lid heater control means 81, and the rice in the pan 11 can be prevented from drying.

Further, in this embodiment, the current of the heating coil 16 is adjusted based on the information from the voltage detecting means 83 so that the electric power supplied to the heating coil 16 becomes constant. That is, if the input voltage from the commercial power source is high, the heating coil control means 82 reduces the current to the heating coil 16, and conversely, if the input voltage from the commercial power source is low, the heating coil control means.
82 increases the current to the heating coil 16. As a result, the same amount of heating can be applied to the pan 11 regardless of fluctuations in the input voltage during rice cooking and heat retention.

Further, when the input voltage from the commercial power source becomes higher during the heat retention, the lid heater control means 81 extends the off time of each heating pattern Pα, Pβ so that the heating amount of each heating pattern Pα, Pβ is substantially increased. When the input voltage from the commercial power source becomes low, the lid heater control means 81 shortens the off time of each heating pattern Pα, Pβ to substantially heat each heating pattern Pα, Pβ. Adjust to increase the amount. By doing so, the temperature of the lid body 5 with respect to the pan 11 can be kept substantially constant in a more stable state regardless of the fluctuation of the input voltage. In order to adjust the heating amount of each heating pattern Pα, Pβ, for example, the ON time may be changed instead of the OFF time, or the ON / OFF cycle (frequency) may be changed.

As described above, in the present embodiment, the pot 11, the heating coil 16 as the heating means for heating the pot 11, and the pot 11
Temperature sensor 21 as a temperature detecting means for detecting the temperature of
And a control means 71 as a heat generation control means for controlling the heating coil 16 based on the information of the temperature sensor 21, and when the boiling is completed, the heating of the pan 11 by the heating coil 16 is stopped. Detection temperature T in the temperature sensor of
If the temperature difference ΔT from the detected temperature T after the elapse of a certain time is larger than the determined values Ta and Tb, the heating of the pot 11 is increased thereafter, and conversely the temperature difference ΔT is the determined value Ta,
If it is smaller than Tb, the subsequent heating of the pot 11 is stopped or reduced.

In this case, by temporarily stopping the heating of the pan 11 by the heating coil 16 when the boiling is completed, the detected temperature T of the pan 11 and the temperature of the rice inside the pan 11 are kept in the meantime. And the temperature sensor 21
The temperature detection accuracy is improved. Further, since the temperature detection accuracy of the temperature sensor 21 is increased, it is not necessary to provide another temperature detecting means on the lid 5, for example, and an extra lead wire wired from the other temperature detecting means is broken, Alternatively, it is possible to eliminate defects such as difficulty in manufacturing, and to provide an inexpensive heat-insulating pot with few failures.

If the temperature difference between the pan 11 and the inside of the rice becomes large, such as when the amount of rice cooked is large, the temperature T detected by the temperature sensor at the time when the heating of the pan 11 is stopped and the temperature T after the elapse of a certain time. Although the temperature difference ΔT from the detected temperature T becomes large, in this case, heating of the pot 11 after a certain period of time is increased to prevent insufficient heating of rice. On the contrary, when the amount of cooked rice is small and the temperature difference between the pan 11 and the inside of the rice becomes small, the temperature T detected by the temperature sensor 21 at the time when the heating of the pan 11 is stopped.
Then, the temperature difference ΔT from the detected temperature T after a lapse of a certain time becomes small, but in that case, the heating to the pot 11 after a lapse of the certain time is stopped or reduced, so that the spillage can be prevented.

Therefore, in the case where the pan 11 itself generates heat by the heating coil 16, by increasing the temperature detection accuracy by using the temperature sensor 21 which is the temperature detecting means of the pan 11,
It is possible to cook boiled rice by preventing spillage and insufficient heating without providing extra temperature detection means.

By the way, as described above, after the boiling is completed, the pot 11
If the heating stop time is set to a long time when the configuration for temporarily stopping the heating to the is adopted, the temperature detection accuracy of the temperature sensor 21 increases, but the rice cooking time becomes longer and the heating cannot be sufficiently added. Cause problems.

In order to deal with such a problem, when the boiling is completed, the pot by the heating coil 16 which is the heat generating means is used.
Stop heating to 11 and temperature sensor during this heating stop period
When the decrease rate Ry of the detected temperature T in 21 becomes equal to or less than the predetermined value, the heating amount is made smaller than before the heating is stopped
When the heating to 11 is restarted and the heating stop period exceeds a certain time, the heating amount may be increased to be equal to or more than the heating amount before heating and the pot 11 may be heated.

[0064] In this way, when the amount of cooked rice is large, a pan is used.
When the temperature difference between 11 and the inside of the rice becomes large, the temperature difference ΔT between the temperature T detected by the temperature sensor 21 at the time when the heating of the pan 11 is stopped and the temperature T detected after a certain period of time becomes large,
The decrease rate Ry of the detected temperature T increases, but at this time the pan
Since the heating to 11 continues for a certain time, the temperature T of the pan 11 and the temperature inside the rice housed in the pan 11 can be made uniform during that time, and the temperature detection accuracy of the temperature sensor 21 after that can be improved. Get higher Further, since the temperature detection accuracy of the temperature sensor 21 is increased, another temperature detection means is not required, and as described above, it is possible to provide an inexpensive heat-retaining pot with few failures. Further, in this case, the amount of heating before heating is increased to be equal to or more than that, and the heating of the pot 11 is restarted, so that insufficient heating of the rice can be prevented.

On the contrary, when the amount of cooked rice is small and the temperature difference between the pan 11 and the inside of the rice becomes small, the temperature T detected by the temperature sensor 21 at the time when the heating of the pan 11 is stopped and a certain period of time elapses. The temperature difference ΔT with the subsequent detection temperature T becomes small, but in that case, when the decrease rate Ry of the detection temperature T becomes equal to or less than a predetermined value, heating of the pan 11 is restarted immediately. Therefore, the cooking time can be shortened and the heating stop can be minimized. Further, after the heating is restarted, the heating amount is made smaller than that before the heating is stopped and the heating of the pan 11 is restarted, so that the spillage can be prevented. Therefore, also in this case, if the pan 11 itself is heated by the heating coil 16, and the temperature detection accuracy is increased by using the temperature sensor 21 which is the temperature detection means of the pan 11, an unnecessary temperature detection means is provided. It is possible to cook savory rice by preventing spillage and insufficient heating without providing it.

As another configuration, when the boiling is completed, the heating of the pot 11 by the heating coil 16 which is the heat generating means is stopped, and the temperature T detected by the temperature sensor 21 at this time and the temperature detected after a certain time has elapsed It is also possible to determine where the temperature difference ΔT from T is in a plurality of set temperature zones ΔTa and ΔTb, and switch the heating amount when heating the pot 11 thereafter.

Also in this case, by temporarily stopping the heating of the pan 11 by the heating coil 16 when the boiling is completed,
In the meantime, the detection temperature T of the pan 11 and the temperature inside the rice housed in the pan 11 can be made uniform, and the temperature sensor thereafter.
21 Temperature detection accuracy is high. Further, since the temperature detection accuracy of the temperature sensor 21 is increased, another temperature detection means is not required, and as described above, it is possible to provide an inexpensive heat-retaining pot with few failures.

Further, according to the temperature difference ΔT between the temperature T detected by the temperature sensor 21 at the time when the heating of the pot 11 is stopped and the temperature T detected after a lapse of a certain time, the amount of heating to the pot 11 thereafter is increased. Can be optimized to prevent insufficient heating and spilling of rice. Therefore, also in this case, if the pan 11 itself is heated by the heating coil 16, and the temperature detection accuracy is increased by using the temperature sensor 21 which is the temperature detection means of the pan 11, an unnecessary temperature detection means is provided. It is possible to cook savory rice by preventing spillage and insufficient heating without providing it.

Further, when the boiling is completed, the heating coil 16 which is the heat generating means is stopped, and when the rate of decrease in the temperature detected by the temperature sensor 21 becomes less than a predetermined value during this heating stop period, the heating is stopped. A plurality of temperature differences are set between the temperature T detected by the temperature sensor 21 when the heating amount is made smaller than before and the heating to the pan 11 is stopped, and the temperature T after a certain period of time has elapsed. It may be possible to adopt a configuration in which it is determined where the temperature range is and the heating amount is switched when heating the pot 11 thereafter.

[0070] In this way, when the amount of cooked rice is large, a pan is used.
When the temperature difference between 11 and the inside of the rice becomes large, the temperature difference ΔT between the temperature T detected by the temperature sensor 21 at the time when the heating of the pan 11 is stopped and the temperature T detected after a certain period of time becomes large,
The decrease rate Ry of the detected temperature T increases, but at this time the pan
Since the heating to 11 continues for a certain time, the temperature T of the pan 11 and the temperature inside the rice housed in the pan 11 can be made uniform during that time, and the temperature detection accuracy of the temperature sensor 21 after that can be improved. Get higher Further, since the temperature detection accuracy of the temperature sensor 21 is increased, another temperature detection means is not required, and as described above, it is possible to provide an inexpensive heat-retaining pot with few failures.

Further, in this case, according to the temperature difference ΔT between the temperature T detected by the temperature sensor 21 at the time when the heating of the pan 11 is stopped and the temperature T detected after a lapse of a certain time, the subsequent pan 11 is heated.
The amount of heating to rice can be optimized, and insufficient heating or spilling of rice can be prevented.

On the contrary, when the amount of cooked rice is small and the temperature difference between the pan 11 and the inside of the rice becomes small, the temperature T detected by the temperature sensor 21 at the time when the heating of the pan 11 is stopped and a certain time elapses. The temperature difference ΔT with the subsequent detection temperature T becomes small, but in that case, when the decrease rate Ry of the detection temperature T becomes equal to or less than a predetermined value, heating of the pan 11 is restarted immediately. Therefore, the cooking time can be shortened and the heating stop can be minimized. Further, after the heating is restarted, the heating amount is made smaller than that before the heating is stopped and the heating of the pan 11 is restarted, so that the spilling can be surely prevented. Therefore, also in this case, if the pan 11 itself is heated by the heating coil 16, and the temperature detection accuracy is increased by using the temperature sensor 21 which is the temperature detection means of the pan 11, an unnecessary temperature detection means is provided. It is possible to cook savory rice by preventing spillage and insufficient heating without providing it.

Further, in the present embodiment, the pot 11, the heating coil 16 as the heat generating means for heating the pot 11, the temperature sensor 21 as the temperature detecting means for detecting the temperature of the pot 11, and the temperature sensor 21 A heating coil control means 82 as a heat generation control means for controlling the heating coil 16 based on the information, a lid 5 as a lid for covering the pan 11, and a lid heater 41 as a lid heating means for heating the lid 5. It comprises a lid heater control means 81 as a lid control means for adjusting the heating pattern of the lid heater 41 by the heating pattern of the heating coil control means 82, and the heating coil control means 82 selects a heating pattern having a large heating amount, The lid heater control means 81 selects a heating pattern with a large heating amount, and conversely, the more the heating coil control means 82 selects a heating pattern with a small heating amount, the lid heater control means 81 selects a heating pattern with a small heating amount. It is configured to select.

With this arrangement, the lid heater control means 81 causes the lid heater control means 81 to operate in conjunction with the heating pattern selected by the heating coil control means 82 even when the temperature is kept warm and the ambient temperature or the input voltage is affected. Since the heating pattern that optimizes the heating amount for the pan is selected, the temperature of the lid 5 with respect to the pan 11 can be kept substantially constant only by the temperature sensor 21. Therefore, it is possible to prevent dew condensation on the lid 5, and it is possible to prevent the dew condensation water from dripping on the rice in the pan 11 and sticking the rice. In addition, it is possible to prevent the rice from being dried and hardened due to the temperature of the lid 5 becoming high, and the rice from being discolored to cause an offensive odor, and it is possible to retain delicious rice for a long time.

Further, it is not necessary to provide another temperature detecting means on the lid body 5, and it is possible to eliminate troubles such as a failure of an extra lead wire wired from the other temperature detecting means or a difficulty in manufacturing. In addition, it is possible to provide an inexpensive kettle with less trouble.

Further, in this embodiment, in this embodiment, voltage detecting means 83 for detecting the input voltage is further provided, and when the input voltage detected by the voltage detecting means 83 becomes low, the current to the heating coil 16 is reduced. And the lid 5
The lid heater control means 81 adjusts the heating patterns Pα and Pβ so that the amount of heating to the heater becomes small.

In this case, the current of the heating coil 16 is adjusted based on the information from the voltage detecting means 83 so that the electric power supplied to the heating coil 16 becomes constant. Therefore, the same amount of heating can be applied to the pan 11 during rice cooking and heat retention without being affected by fluctuations in the input voltage.

Further, depending on the input voltage from the commercial power source,
Since the lid heater control means 81 optimally variably adjusts the heating amount of the heating patterns Pα and Pβ, it is
The temperature of the lid body 5 with respect to the pan 11 can be kept substantially constant in a more stable state. Therefore, even if the current flowing through the heating coil 16 is adjusted, delicious rice can be held for a long time.

Next, another modified example for preventing spillage during rice cooking will be described with reference to FIGS. The same parts as those in the above-mentioned embodiment are designated by the same reference numerals, and the description of the common parts will be omitted because they are redundant. Further, in each of these drawings, reference numerals are given only to portions that are directly related to the following description.

The warming pot here is a pot 11 for putting rice and water to cook rice, a heating coil 16 as a heating means for heating the pot, and a rice cooker body for housing the pot 1 and the heating coil 16. 1, a lid 5 that covers the top of the bottomed tubular pan 11, and a steam port 48 that is connected to the inside of the pan 11 and discharges the steam in the pan 11 to the outside.
The steam port 48 is detachably attached to the upper portion of the lid body 5 in consideration of cleanability.

The structure of the steam port 48 will be described with reference to FIGS. 8 and 10. Although the steam port 48 is detachably attached to the outer lid 46 here, it may be provided integrally with the outer lid 46. . The steam port 48 is supported by a steam port packing 90 made of silicone rubber attached to the outer lid. A seal portion 91 having a dogleg shape is formed below the steam port packing 90. When the steam port 48 is attached to the lid body 5, the seal portion 91 penetrates a hole 92 provided in the heat dissipation plate 40. It comes into close contact with the inner lid 43.

The inner lid 43 is provided with a steam discharge hole 93 for discharging the steam in the pot 11, facing the lower end opening of the steam port 48. The steam discharge hole 93 of the inner lid 43 and the inside of the steam port 48 are connected to each other, and the steam generated from inside the pan 11 passes through the steam discharge hole 93 and the inside of the steam port 48 to the upper part of the steam port 48. The gas is exhausted to the outside through a plurality of exhaust holes 95 formed in a certain lid 94. The bottom of the steam port 48 is sealed by the steam port packing 90 and the inner lid 43, so that the pot 11
The steam generated from does not flow out into the lid 5.

On the other hand, the pot 11 is a pot body 12 made of a material having good thermal conductivity, and a heating element joined to the outer surface of the pot body 12.
13 and a pot that corresponds to the pot body 12
As shown in the enlarged view of FIG. 9, a process for providing a convex portion 85 is performed from the inner bottom surface to the inner side surface of 11. This convex part
The range in which 85 is provided is preferably at least the range facing the heating coil 16. This is because the heating element 13 of the pan 11 is arranged in the area facing the heating coil 16, and the pan 11 generates heat there.

The convex portion 85 provided on the inner surface of the pot 11 has a larger boiling energy than the portion (concave portion) where the convex portion 85 is not provided, and the number of bubbles generated during boiling is large. That is, when rice is cooked, blowing up from the range of the convex portion 85 due to boiling is stronger than that of the other concave portions, and as a result, a lot of sticks are generated and steam is also blowing up. Therefore, if the connecting portion 96 of the steam discharge hole 93 of the inner lid 43 and the steam port 48 is on the convex portion 85, the steam port 48 is affected by the aunt and steam that is continuously boiled immediately before boiling during cooking. It will be greatly received.

Therefore, in the present embodiment, when the convex portion 85 is formed on the inner surface of the pot 11 at least in the facing area of the heating coil 16, the boiling energy becomes stronger on the convex portion 85.
The connection portion 96 of the steam port 48 with the pan 11 is not provided. In this way, it is possible to mitigate the effect of blowing up with steam from the inside of the pan 11 that is generated during rice cooking by intentionally diverting the position of the connecting portion 96, and scattering the bed from the steam port 48, It becomes possible to prevent the phenomenon of spillage such as jetting. Further, by preventing the spillage, the lid, that is, the lid body 5 can be prevented from being soiled, so that the usability is improved. Furthermore, since it is not necessary to reduce the heating amount immediately before boiling when the boiling is continued, it is possible to provide a heat-retaining pot that cooks well.

Further, since the steam port 48 of this embodiment is detachably provided from the lid 5, it becomes possible to remove the steam port 48 from the outer lid 5 to clean the steam port 48 alone.
It becomes possible to improve the cleanability of 48.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention.

[0088]

According to the warming pot of claim 1 of the present invention, the pot itself is heated by the heat generating means, and the temperature detecting accuracy of the pot is increased by using the temperature detecting means of the pot, which is unnecessary. It is possible to cook delicious rice by preventing spillage and insufficient heating without providing a temperature detecting means.

According to the warming pot of claim 2 of the present invention, the pot itself is heated by the heat generating means, and the temperature detecting accuracy of the pot is increased by using the temperature detecting means of the pot. It is possible to cook delicious rice by preventing spillage and insufficient heating without providing any means. Moreover, it is possible to cook rice deliciously and even more quickly by preventing unnecessary heating stoppage, which is a cause of long-cooking time and a long cooking time.

According to the warming pot of claim 3 of the present invention, the pot itself is heated by the heat generating means, and the temperature detecting accuracy of the pot is increased by using the temperature detecting means of the pot to detect an extra temperature. It is possible to cook delicious rice by preventing spillage and insufficient heating without providing any means.

According to the warming pot of claim 4 of the present invention, the pot itself generates heat by the heating means, and the temperature detecting accuracy of the pot is increased by using the temperature detecting means of the pot. It is possible to cook delicious rice by preventing spillage and insufficient heating without providing any means. Moreover, it is possible to cook rice deliciously and even more quickly by preventing unnecessary heating stoppage, which is a cause of long-cooking time and a long cooking time.

According to the warming pot of claim 5 of the present invention, by keeping the temperature of the lid constant by using the temperature detecting means of the pan, the delicious rice can be held for a long time without providing an extra temperature detecting means. can do.

According to the warming pot of claim 6 of the present invention, an extra temperature detecting means is provided even if the heat generating means is adjusted by keeping the temperature of the lid constant by using the temperature detecting means of the pan. It can hold delicious rice for a long time. Furthermore, the same amount of heat can be applied to the pan during rice cooking and heat retention without being affected by fluctuations in the input voltage.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view of a warming pot showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same ferrite cover and its periphery.

FIG. 3 is a bottom view of the same ferrite cover and its periphery.

FIG. 4 is a block diagram showing a control system of the same.

FIG. 5 is a graph showing each step of cooking rice and the temperature detected by the temperature sensor accompanied therewith.

FIG. 6 is a flowchart showing an operation procedure when cooking rice.

[Fig. 7] Same as above, with the temperature detected by the temperature sensor during heat retention,
It is a graph which shows the heating pattern to a pan and a lid.

FIG. 8 is an overall cross-sectional view of a heat retaining kettle showing another modification.

FIG. 9 is a partially enlarged sectional view of the same pot.

FIG. 10 is a cross-sectional view of the above steam port and its surroundings.

[Explanation of symbols]

5 Lid (lid) 11 pot 16 Heating coil (heating means) 21 Temperature sensor (temperature detection means) 41 Lid heater (lid heating means) 71 Control means (heat generation control means) 81 Lid heater control means (lid control means) 82 Heating coil control means (heat generation control means) 83 Voltage detection means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Noriko Sudo             1570 2570 Gosuda, Kamo City, Niigata Prefecture Toshiba             Life Engineering Co., Ltd. Niigata             Inside the office (72) Inventor Hiroshi Morota             1570 2570 Gosuda, Kamo City, Niigata Prefecture Toshiba             Life Engineering Co., Ltd. Niigata             Inside the office (72) Inventor Toshihide Sugisaki             1570 2570 Gosuda, Kamo City, Niigata Prefecture Toshiba             Life Engineering Co., Ltd. Niigata             Inside the office (72) Inventor Takuya Watanabe             1570 2570 Gosuda, Kamo City, Niigata Prefecture Toshiba             Life Engineering Co., Ltd. Niigata             Inside the office (72) Inventor Yoshimitsu Kato             1570 2570 Gosuda, Kamo City, Niigata Prefecture Toshiba             Life Engineering Co., Ltd. Niigata             Inside the office (72) Inventor Shizushi Kobayashi             1570 2570 Gosuda, Kamo City, Niigata Prefecture Toshiba             Life Engineering Co., Ltd. Niigata             Inside the office F-term (reference) 4B055 AA05 AA09 BA09 BA28 BA53                       BA62 CA02 CA25 CA36 CC03                       CC18 CC46 CD02 DA02 DA05                       DB04 DB14 GA07 GA13 GB03                       GB05 GB08 GB12 GC04 GC05                       GC06 GC12 GD02

Claims (6)

[Claims] 1. A pot and a heating means for heating the pot,
A temperature detecting means for detecting the temperature of the pot and a heat generation controlling means for controlling are provided, and the heat generating means is stopped, and if the temperature difference at this time and the temperature difference after a predetermined time is large, the temperature difference is increased. If it is small, the heat-retaining pot is characterized in that the heating is stopped or reduced. 2. A pot and heating means for heating the pot,
It is equipped with a temperature detection means for detecting the temperature of the pot and a heat generation control means for controlling the temperature, and stops the heat generation means, restarts heating when the temperature drop falls below a predetermined value, and exceeds a certain time. And, the heat retaining pot characterized in that it is configured to be the same as or more than that before heating. 3. A pot and a heating means for heating the pot,
It comprises a temperature detection means for detecting the temperature of the pot and a heat generation control means for controlling, and stops the heat generation means, and heats depending on where in the temperature range the temperature difference at this time and the temperature after a fixed time is. Insulation kettle characterized by being configured to switch between. 4. A pot and heating means for heating the pot,
It comprises a temperature detection means for detecting the temperature of the pot and a heat generation control means for controlling, and stops the heat generation means, restarts the heating when the decrease in the temperature becomes a predetermined value or less, and A warming oven characterized in that heating is switched depending on where in the temperature range the temperature and the temperature difference after a certain time is. 5. A pot and heating means for heating the pot,
It comprises a temperature detection means for detecting the temperature of the pan, a heat generation control means for controlling, a lid for covering the pan, a lid heating means for heating, and a lid control means, and the heat generation control means has a large heating pattern. The lid heater is configured to select a larger heating pattern as it is selected, and the lid controller is configured to select a smaller heating pattern as the heat generation controller selects a smaller heating pattern. . 6. A pot, a heat generating means, a lid, a lid heating means for heating, a voltage detecting means for detecting a voltage, a heat generating control means for controlling the electric power to be constant, and a lid control means. When the voltage becomes low, the current is increased and the heating pattern is adjusted. Further, the larger the heating pattern is selected by the heating control means, the larger the heating pattern is selected by the lid control means and the smaller the heating control means is selected. The warming oven characterized in that the lid control means selects a smaller heating pattern as the heating pattern is selected.