JP3029429B1 - Rice cooker - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To sufficiently clean a steam passage in a lid, accurately detect boiling without being affected by an ambient temperature, and remove dirt stubbornly attached to an inner pan or an inner lid. It can be taken securely and can be boiled safely. SOLUTION: A boiling step of heating and boiling water in an inner pot 1 by a pot heating means 8 and a lid heating means 31, and stopping the heating by the lid heating means 31 when the boiling is detected by a lid temperature detecting means 32. And a boiling maintaining step of reducing the amount of heating by the pan heating means 8 and maintaining the boiling for a predetermined time. Before the boiling step, a preheating step of preheating the inner pot 1 to a predetermined temperature is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker, and more particularly to an improvement in the cleaning property of the rice cooker.

[0002]

2. Description of the Related Art After cooking rice with a conventional rice cooker, an inner pot is used to remove dirt and smell attached to the body.
It was necessary to remove the inner lid, packing, etc. and wash with household detergent. In recent years, in Japanese Patent Application Laid-Open No. 10-211093,
There has been proposed a rice cooker provided with a course for reducing odor by boiling water put in an inner pot for a predetermined time. In Japanese Patent Application Laid-Open No. Hei 10-337247, a similar boiling course is provided, heating is performed at the maximum heating amount from the start of heating, and when boiling is detected, the heating amount is reduced to continue boiling, and a small amount of water remains. There has been proposed a rice cooker in which heating is stopped to reduce the amount of water used and prevent dew from scattering from a steam passage.

[0003]

However, in the rice cooker provided with the boiling course, when heating not only the pan heater but also the lid heater to turn on the heating at the maximum heating amount at the start of boiling, the steam passage in the lid is opened. The passing steam is heated and dried, and the cleanability of the steam passage is reduced.

Further, the detection of boiling is delayed due to the influence of the ambient temperature. For this reason, in the winter season, the boiling detection is delayed and the heating is excessive, and there is a risk that the steam scatters from the steam port. Also, in summer, the boiling detection is too fast, the boiling time is shortened, and cleaning may be insufficient.

Further, if the lid is opened after the boiling, the dew adhering to the inner lid may fall off and scatter around. In addition, in the conventional boiling course, dirt stubbornly attached to the inner pot or inner lid could not be removed. Also, a large amount of steam is released from the steam port during boiling,
If the lid is accidentally opened, the hands and face are exposed to steam, which is dangerous. Furthermore, if too much water is stored in the inner pot, it is empty and dangerous.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to sufficiently clean a steam passage in a lid and to accurately detect boiling without being affected by an ambient temperature. It is an object of the present invention to provide a rice cooker that can reliably remove dirt stubbornly attached to a pot or an inner lid and can perform safe boiling.

[0007]

[Summary of the invention of claim 1 is a means for solving the problems, the inner bowl, a main body that can accommodate taken out inner pot, the lid that is attached to the body Pan heating means for heating the inner pan, lid heating means for heating the lid, pan temperature detecting means for detecting the temperature of the inner pan, and lid temperature detecting means for detecting the temperature of the lid A control means for controlling the pot heating means and the lid heating means based on the detected temperatures of the pot temperature detecting means and the lid temperature detecting means to cook rice, and for boiling water contained in the inner pan. Wherein the control means comprises: a boiling step in which the pot heating means and the lid heating means heat and boil water in the inner pan by boiling; and the lid heating means when the lid temperature detecting means detects boiling. And the heating by By reducing the heating amount by the heating means is obtained so as to perform a boiling maintained step of maintaining the boiling predetermined time.

As described above, since the heating by the lid heating means is stopped in the boiling maintaining step, the steam passing through the vapor passage in the lid is not dried, and the vapor passage in the lid is sufficiently cleaned by the wet steam. be able to.

[0009] The invention of claim 2 provides an inner pot, a main body for removably accommodating the inner pot, a lid attached to the main body, a pot heating means for heating the inner pot, A pot temperature detecting means for detecting a temperature, a lid temperature detecting means for detecting a temperature of the lid, and controlling the pan heating means based on the detected temperatures by the pan temperature detecting means and the lid temperature detecting means to cook rice. A rice cooker comprising a control means for boiling the water contained in the inner pot, wherein the control means comprises: a preheating step of preheating the inner pot to a predetermined temperature by the pot heating means; A boiling step of heating water in the inner pot by means of boiling, and a boiling maintaining step of reducing the amount of heating by the pot heating means and maintaining boiling for a predetermined time when the lid temperature detecting means detects boiling. What I did That. By this preheating step, the atmosphere of the lid temperature detecting means is not affected by the ambient temperature in winter or summer, and the boiling can be detected accurately.

[0010] The invention according to claim 3 is that the inner pan, a main body for removably housing the inner pan, a lid attached to the main body, a pan heating means for heating the inner pan, A pot temperature detecting means for detecting a temperature, a lid temperature detecting means for detecting a temperature of the lid, and controlling the pan heating means based on the detected temperatures by the pan temperature detecting means and the lid temperature detecting means to cook rice. A rice cooker comprising a control means for boiling water placed in the inner pot, wherein the control means comprises: a boiling preliminary step of heating the inner pot by the pot heating means for a predetermined time; A boiling step of heating water in the inner pot by means of boiling, and a boiling maintaining step of reducing the amount of heating by the pot heating means and maintaining boiling for a predetermined time when the lid temperature detecting means detects boiling. What I tried to do A. By heating the inner pot in the boiling preliminary step, the lid rises to a certain temperature, and the atmosphere of the lid temperature detecting means is not affected by the ambient temperature in winter or summer, so that the boiling can be detected accurately.

According to a fourth aspect of the present invention, there is provided an inner pot, a main body for removably accommodating the inner pot, a lid attached to the main body, a pot heating means for heating the inner pan, and Lid heating means for heating, pan temperature detecting means for detecting the temperature of the inner pan, lid temperature detecting means for detecting the temperature of the lid, and a temperature detected by the pan temperature detecting means and the lid temperature detecting means. Controlling the pot heating means and the lid heating means to cook rice, and in a rice cooker comprising control means for boiling water contained in the inner pan, the control means is controlled by the lid heating means. A boiling preliminary step of heating the lid for a predetermined time, a boiling step of heating the water in the inner pot by the pot heating means to boil, and a heating amount by the pot heating means when the lid temperature detection means detects boiling. And reduce boiling to a specified time. Is obtained so as to perform a boiling maintained steps of. By heating the lid in the boiling preliminary step, the atmosphere of the lid temperature detecting means is not affected by the ambient temperature in winter or summer, so that the boiling can be detected accurately.

According to a fifth aspect of the present invention, the heating by the lid heating means is performed for a predetermined time after or immediately before the end of the boiling maintaining step. As a result, the dew attached to the inner lid in the boiling maintaining step evaporates, so that when the lid is opened, there is no dripping of the dew, which is safe.

According to a sixth aspect of the present invention, the heating amount is reduced or set to zero for a predetermined time after the start of the boiling maintaining step. During this pause time, the stubborn dirt adhering to the inner pot or the inner lid is swollen, flows and falls on the water surface in the inner pot with water droplets, and is removed.

According to a seventh aspect of the present invention, in the boiling step and the boiling maintaining step, a pressure regulating means for adjusting the inside of the inner pot to a constant pressure exceeding atmospheric pressure is provided. With such a pressure adjusting means, the temperature of the water in the inner pot exceeds 100 ° C., so that the cleaning property is improved. On the other hand, no steam is released during the boiling, so that the surroundings are not adversely affected and it is safe.

The invention according to claim 8 is such that the lid is locked in a closed state when the inner pan is regulated by the pressure regulating means. This ensures that the lid is not accidentally opened during boiling and is safe.

According to a ninth aspect of the present invention, when the pan temperature detecting means detects a predetermined empty cooking temperature, the heating by the pan heating means and the lid heating means is stopped and an error display is displayed. It is. As a result, the heating is stopped in advance, so that the empty cooking state is prevented, there is no danger of damage to the vessel, and the apparatus is safe, and an error message is displayed, so that the user can take measures such as adding water. Can take.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a rice cooker according to the present invention. This rice cooker comprises an inner pot 1, a main body 2 for accommodating the inner pot 1, and a lid 3.

In the main body 2, an inner pan accommodating space 6 is formed by the inner trunk 4 and a bowl-shaped protection frame 5 attached to the lower end of the inner trunk 4. The outer surface of the inner shell 4 has a 40-watt body heater 7
And an induction heating coil 8 capable of outputting 1000 watts of electric power is provided on the outer surface of the protection frame 5. The protective frame 5 has an inner pot 1 accommodated in the inner pot accommodation space 6.
And a pot temperature sensor 9 for detecting the temperature of the inner pot 1 is attached. The front shoulder 10 of the main body 2 has a locking hole 11 for locking a hook 24 of the lid 3 to be described later.
Is provided. In the front space inside the main body 2, a control device 12 for controlling the body heater 7, the induction heating coil 8, and a lid heater 31, which will be described later, switches such as a rice cooker switch and a cleaning switch, and an operation display device having a liquid crystal display panel 13 are provided.

On the front of the main body 2, an operation display panel 14 is mounted on the operation display device 13. As shown in FIG. 2, the operation display panel 14 includes a rice cooker / reheater switch operating unit 15a, a reservation switch operating unit 15b, a warming / night resting warming switch operating unit 15c, a start switch operating unit 15d, and hour and minute setting switches. Operation unit 15
e, 15f, cleaning switch operation unit 15g, menu switch operation unit 15h, window 16a of liquid crystal display panel 16.
Is provided.

The lid 3 comprises an upper lid plate 21 and a lower lid plate 22, and the rear end thereof is attached to the main body 2 by a hinge 23 so as to be freely opened and closed. A hook 24 is provided at the front end of the lid 3.
Is mounted so as to be rotatable about a shaft 25. The lower end of the hook 24 protrudes downward through the lid lower plate 22, and is locked in the locking hole 11 of the shoulder 10 of the main body 1. The upper end of the hook 24 is in contact with an inward projection 28 of a lid opening button 27 that is rotatably attached to the lid upper plate 21 by a shaft 26. When the lid release button 27 is pressed with the lid 3 closed, the inward projection 2
8 presses the upper end of the hook 24, and as a result, the hook 24 rotates against the urging force of a spring (not shown), so that the lower end of the hook 24 is unlocked from the locking hole 11 of the shoulder portion 10, and the lid is released. The body 3 is automatically opened by a spring 29 mounted around the hinge 23.

A heat radiating plate 30 is attached to the lower surface of the lower lid plate 22 by screws with a gap from the lower lid plate 22. On the upper surface of the heat radiating plate 30, a lid heater 31 of 30 watts is provided, and a lid temperature sensor 32 for detecting the temperature of the heat radiating plate 30, that is, the temperature of the lid 3 is attached. On the outer periphery of the heat sink 30, a packing 33 that is in pressure contact with the upper opening edge of the inner pot 1 is attached. Heat sink 3
An inner lid 34 is detachably mounted below the lower part 0 so as to be washable. A steam outlet 35 is formed at the center of the inner lid 34, and an inner lid packing 36 that fits into the inner peripheral surface of the upper end of the inner pan 1 is mounted on the outer periphery.

A steam outlet 35 is provided on the upper surface of the inner lid 34.
Pressure adjusting ball case 37 is attached by screws. The pressure regulating ball case 37 has a lower case 38 whose upper end is closed and whose lower end contacts the upper surface of the inner lid 34.
An upper case 39 that covers the lower case 38;
8 and a pressure regulating ball 40 housed between the upper case 39. When the pressure regulating ball 40 is pressed by a plunger 43a of a solenoid 43, which will be described later, which enters from an opening 41 on the side surface of the upper case 38, as shown in FIG.
As shown by the dashed line, when the plunger 43a of the solenoid 43 retreats from the hole 42 of the lower case 38 and opens the hole 42, The hole 42 can be moved to a position where the hole 42 is closed.

Inside the lid 3, a solenoid 43 having a plunger 43a for pressing the pressure regulating ball 40 is housed. Plunger 43a of solenoid 43
A lock member 44 extending to the vicinity of the hook 24
Is attached. At the front end of the lock member 44, an engagement portion 45 that engages with the upper end of the hook 24 is provided. When the plunger 43a of the solenoid 43 advances toward the pressure regulating ball 40, the lock member 44 slides rightward in FIG. While the plunger 43a allows the pressure regulating ball 40 to be opened.
When retracted from FIG. 1, it slides to the left in FIG. 1, and the engaging portion 45 engages with the upper end of the hook 24 so that the lid 3 cannot be opened.

The lower lid plate 22 and the upper lid plate 21 are formed with an opening 46 and a vapor discharge port 47, respectively. And
From the steam outlet 35 of the inner lid 34, the pressure regulating ball case 37
Hole 42 of lower case 38, opening 41 of upper case 39,
A steam flow path 48 is formed to reach the opening 46 of the lower lid plate 22, the inside of the lid 3, and the vapor outlet 47 of the upper lid plate 21.

Next, the rice cooker control device 12 of the present invention will be described.
, The rice cooking operation is not directly related to the present invention, and therefore will be omitted, and only the cleaning operation will be described with reference to FIGS.

After cooking rice such as cooked rice and finishing eating rice, washing the inner pot 1, the inner lid 34, and the radiator plate 30,
Odor may remain. In such a case, inner pot 1
When water is filled up to a predetermined water level line and set in the main body 2 and the cleaning switch operation section 15g of the operation display panel 14 is pressed, the cleaning operation is started by the control device 12, and the inner pan 1, The inner lid 34, the packing 36, and the steam flow path 48 can be cleaned, and dirt and smell attached during cooking of cooked rice or the like can be removed. This cleaning operation includes a preheating step, a boiling step, a boiling maintaining step, and a heat radiation step.

In the preheating step, electric power is supplied to the induction heating coil 8 and the lid heater 31, and the temperature of the inner pan 1 is adjusted to 50 ° C. based on the temperatures detected by the pan temperature sensor 9 and the lid temperature sensor 32. The temperature of the heat sink 30 of the body 3 is adjusted to 40 ° C.
After a lapse of a predetermined time, the process moves to the next boiling step.

Here, the reason for introducing the preheating step is as follows. The lid temperature sensor 32 has a function of detecting the boiling of the water in the inner pan 4 during the cleaning operation, but does not directly detect the temperature of the steam or the water, but indirectly detects the boiling of the water by the temperature of the radiator plate 30. Therefore, the boiling detection temperature is lower than 100 ° C.
7 ° C. If the boiling step is started immediately after the cleaning switch is turned on without the preheating step, the temperature detected by the lid temperature sensor 32 is affected by the ambient temperature, and the temperature rise rate varies depending on the season. That is, as shown in FIG. 4B, in winter, even if the temperature detected by the pot temperature sensor 9 reaches the boiling temperature, the temperature detected by the lid temperature sensor 32 is still lower than the boiling temperature (57 ° C.). , The detection of the boiling detection temperature is delayed by t ₁ time. For this reason, there is a possibility that the steam may be scattered from the steam discharge port 47 or may be cooked in an empty state, which is dangerous. In addition, as shown in FIG. 4C, in summer, although the temperature detected by the pot temperature sensor 9 has not yet reached the boiling temperature, the lid temperature sensor 32 detects the boiling temperature (5.
Since 7 ° C.) for detecting a boiling detection is advanced by t ₂ hours. For this reason, the process proceeds to the boiling maintaining step without boiling the water in the inner pan 1 and the boiling maintaining time is shortened, and there is a possibility that cleaning may be insufficient. In the present embodiment, as shown in FIG. 4 (A), the above-described preheating step is provided to keep the lid temperature at a constant temperature for a predetermined time, and thereafter, the lid temperature is raised to the boiling detection temperature, whereby a lid temperature sensor is provided. Thus, the detection of the boil by 32 is ensured regardless of the ambient temperature.

In the boiling step, the maximum power is supplied to the induction heating coil 8 and the lid heater 31, and the water in the inner pan 4 is heated and boiled. The lid temperature sensor 32 detects a predetermined boiling detection temperature (57
C.), the process moves to the next boiling maintaining step.

In the boiling maintaining step, the supply of electric power to the lid heater 31 is stopped, while the induction heating coil 8 is supplied with weak electric power (in the present embodiment, 600 W and an electric conduction rate of 6/15).
To maintain boiling and continue to generate steam.
The steam generated in this process is not only the inner pan 1 but also the inner lid 3
4 and its packing 33, the heat radiating plate 30, and the steam flow path 48, and they are washed to remove dirt and smell attached to them. In the boiling maintaining step, the supply of electric power to the lid heater 31 is stopped. However, if the lid heater 31 is kept on, the steam passing through the steam flow path 48 is heated and dried, and the cleaning effect is reduced. The lid heater 3
1 is turned off, and the wet steam is allowed to flow through the steam flow path 48 so that the cleaning function is sufficiently exhibited.

In the boiling maintaining step, the power supply to the induction heating coil 8 is stopped for a certain period of time S
(About one minute in this embodiment) are provided at several places.
By providing the rest time zone S in this manner, the dirt attached to the inner pot 1 and the inner lid 34 can be spread, flowed and dropped together with water droplets, and the cleaning property is improved. Note that, during this pause period S, the power supplied to the induction heating coil 8 is set to zero as described above, while the body heater 7 is turned off.
May be supplied so that the temperature does not decrease. After a lapse of a predetermined time (about 5 minutes in this embodiment), the process proceeds to the next heat radiation step.

In the heat radiating step, the supply of electric power to the induction heating coil 8 is stopped, weak electric power is supplied to the lid heater 31 to heat the heat radiating plate 30, and the temperature is adjusted to 120 ° C. This is dangerous if the user immediately opens the lid 3 after the cleaning is completed, because the dew drops attached to the inner lid 34 flow down and the lid heater 31 is turned on after the boiling maintaining step to turn on the inner lid 34. Is heated to evaporate the dew drops adhering to the inner lid 34. When this heat radiation step is continued for a predetermined time (three minutes in the present embodiment), the cleaning operation ends. The heat radiation step may be started before the boiling maintaining step is completed.

During the above-described cleaning operation, the lid 3 is
It is preferable to lock to prevent accidental release.
That is, when the cleaning switch is turned on, the solenoid 43 is turned on, and the plunger 43a is retracted and retracts from the pressure regulating ball 40. As a result, the pressure adjusting ball 40 rests on the hole 42 of the lower case 38 of the pressure adjusting ball case 37 to close the hole 42, and the inner pot 1
4 and pressurized to a pressure above atmospheric pressure. Further, the locking member 44 is pulled by the retraction of the plunger 43a.
Slides forward, and its engaging portion 45 engages with the upper end of the hook 24. As a result, the lid 3 cannot be opened even if the lid release button 27 is pressed, and there is no danger that the lid 3 is opened and the hand or face is burned without knowing that the cleaning is being performed. In addition, the pressure regulating ball 40
Is pressurized to a pressure higher than the atmospheric pressure,
Boiling temperature rises, and cleaning performance improves. In addition,
Although the steam passage 48 is blocked by the pressure regulating ball 40,
When the internal pressure rises above a certain pressure, a safety valve (not shown) provided on the inner lid 34 opens and the steam flows into the steam flow station 48, so that the cleaning performance of the steam flow path 48 is not significantly impaired.

During the cleaning operation, the start and end of the cleaning operation are notified to the user, and a display indicating that the cleaning operation is being performed and an error display are performed. That is, when the cleaning switch is pressed to start the cleaning operation, the buzzer sound is notified once, and when it is finished, the buzzer sound is notified eight times. As shown in FIGS. 5A and 5B, when the cleaning switch is pressed from the clock display state on the liquid crystal display panel 16 of the operation display panel 14, the remaining time until the end of the cleaning operation (FIG. 35 minutes), and seven consecutive bar segments 17 provided thereunder are sequentially lit to indicate that the cleaning operation is being performed. Specifically, as shown in FIG.
,... Are turned on sequentially, and when all seven are turned on, the lights are sequentially turned off from the first one, and this is repeated to perceive the bar 17 as running. On the other hand, when the cleaning switch is erroneously pressed without water in the inner pot 1 and the water is cooked empty, or when the water in the inner pot 1 is empty and the water is cooked empty, the pot temperature sensor 9 is set to the predetermined temperature. Of the empty cooking (120 ° C. in the embodiment) of the liquid crystal panel 1
In FIG. 6, as shown in FIG. 5 (C), “H04” lights up, and it is displayed that the food is cooked empty. When this empty cooking is displayed, the user presses the stop switch 15d,
Water can be added and cleaning can be started again.

The display of the cleaning operation is not limited to the above-described one. As shown in FIG. 7, a plurality of segments 18 indicating lines imagining a shuttle are sequentially changed from on to off to gradually remove dirt. You may make it perceive the state which is performed.

FIG. 8 shows another embodiment of the cleaning operation. In this embodiment, a boiling preliminary step of supplying intermediate power to the induction heating coil 8 is introduced instead of the preheating step as in the first embodiment shown in FIG. When the inner pot 1 is heated by this intermediate power, the temperature of the lid 3 rises, and when the ambient temperature of the lid temperature sensor 32 is adjusted to about 40 ° C., the maximum power is supplied.
Thereby, boiling detection by the lid temperature sensor 32 can be reliably performed regardless of the ambient temperature.

FIG. 9 shows still another embodiment of the cleaning operation. This embodiment differs from the embodiment of FIG. 8 in that a boiling preliminary step of supplying power only to the lid heater 31 is introduced before the boiling step. This lid heater 3
1, the radiator plate 30 of the lid 3 is directly heated, and when the ambient temperature of the lid temperature sensor 32 is adjusted to about 40 ° C., the lid heater 31 and the induction heating coil 8 are heated.
Apply maximum power to Thereby, the lid temperature sensor 32
Can be reliably detected regardless of the ambient temperature. In this case, it is desirable that the electric power supplied to the lid heater 31 is large (for example, about 200 W) so that the temperature of the lid 3 is surely increased only by the lid heater 31.

Although the rice cooker of the above embodiment uses the electromagnetic induction heating method as a means for heating the inner pot 1, it may be an electric heater.

[0040]

As is apparent from the above description, according to the first aspect of the present invention, since the heating by the lid heating means is stopped in the boiling maintaining step, drying of the steam passing through the vapor passage in the lid is eliminated. In addition, the steam passage in the lid can be sufficiently cleaned by the wet steam.

According to the second aspect of the present invention, the preheating step of preheating the inner pot to a predetermined temperature is provided before the boiling step.
Since the atmosphere of the lid temperature detecting means is not affected by the ambient temperature in winter or summer, the boiling can be detected accurately.

According to the third aspect of the present invention, since the boiling preliminary step of heating the inner pot by the pot heating means for a predetermined time is provided before the boiling step, the lid is heated by heating the inner pot before the boiling step. Since the temperature rises to a certain temperature and the atmosphere of the lid temperature detecting means is not affected by the ambient temperature in winter or summer, boiling can be detected accurately.

According to the fourth aspect of the present invention, a boiling preliminary step of heating the lid by the lid heating means for a predetermined time before the boiling step is provided. Since the atmosphere of the detecting means is not affected by the ambient temperature in winter or summer, the boiling can be detected accurately.

According to the fifth aspect of the invention, the heating by the lid heating means is performed for a predetermined time after or immediately before the end of the boiling maintaining step, so that the dew attached to the inner lid in the boiling maintaining step evaporates. When the lid is opened, there is no dew dropping and it is safe.

According to the sixth aspect of the present invention, the heating amount is reduced or set to zero for a predetermined time after the start of the boiling maintaining step. The stubborn dirt is swollen and flows along with water droplets onto the water surface in the inner pot, falls, and is removed.

According to the seventh aspect of the present invention, in the boiling step and the boiling maintaining step, the pressure in the inner pot is adjusted to a constant pressure exceeding the atmospheric pressure. Over 100 ° C, cleaning performance is improved,
Since no steam is released during boiling, it does not adversely affect the surroundings and is safe.

According to the eighth aspect of the present invention, the lid is locked in the closed state when the inner pan is regulated by the pressure regulating means, so that the lid is not accidentally opened during boiling. It is safe.

According to the ninth aspect of the present invention, when the pan temperature detecting means detects a predetermined empty cooking temperature, the heating by the pan heating means and the lid heating means is stopped, and an error is displayed. In addition, the heating is stopped in advance, so that the empty cooking state is prevented, and there is no danger of damage to the container, and the apparatus is safe. The error display allows the user to take measures such as adding water.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a rice cooker according to the present invention.

FIG. 2 is a front view of an operation display panel of the rice cooker of FIG. 1;

FIG. 3 is a diagram showing a change in electric power during a cleaning operation.

FIG. 4 (A) is a diagram showing changes in detected temperatures of a lid and a pan in a preheating step and a boiling step in the present invention, and FIG. 4 (B) is a detection temperature of a lid and a pan in a boiling step in winter when there is no preheating step. (C) is a diagram showing a change in the detected temperature of the lid and the pan in the boiling process in summer when there is no preheating process.

FIG. 5A shows a state before a cleaning operation is started, and FIG.
FIG. 4 is a front view showing a display on each liquid crystal display panel during operation, and FIG.

FIG. 6 is a diagram showing the lighting order of bar segments during the operation of cleaning the liquid crystal display panel.

FIG. 7 is a diagram showing a lighting order of bar segments during a cleaning operation of the liquid crystal display panel.

FIG. 8 is a diagram illustrating another example of a change in power during a cleaning operation.

FIG. 9 is a diagram showing still another example of a change in power during a cleaning operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner pan 2 Main body 3 Lid 7 Body heater (pan heating means) 8 Induction heating coil (pan heating means) 9 Pan temperature sensor 12 Control device 15g Cleaning switch operation part 16 Liquid crystal display panel 24 Hook 30 Radiator plate 31 Lid heater ( Lid heating means) 32 lid temperature sensor 34 inner lid 44 locking member

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Mori 1-20-5 Tenma, Kita-ku, Osaka-shi, Osaka Zojirushi Mahobin Co., Ltd. (56) References JP-A 10-155656 (JP, A) JP JP-A-10-337247 (JP, A) JP-A-10-211093 (JP, A) JP-A-9-248241 (JP, A) JP-A-7-31538 (JP, A) JP-A-6-121730 (JP) , A) JP-A-6-277143 (JP, A)

Claims (9)

(57) [Claims] 1. An inner pan, a main body for removably housing the inner pan, a lid attached to the main body, a pan heating means for heating the inner pan, and a lid heating means for heating the lid A pot temperature detecting means for detecting a temperature of the inner pot; a lid temperature detecting means for detecting a temperature of the lid; a pot heating means based on the detected temperatures by the pan temperature detecting means and the lid temperature detecting means. And a rice cooker comprising: a cooker for controlling the lid heating means to cook rice; and a control means for boiling the water contained in the inner pot, wherein the control means is internally heated by the pot heating means and the lid heating means. A boiling step of heating and boiling water in the pot, and stopping the heating by the lid heating means when the boiling is detected by the lid temperature detecting means, and reducing the amount of heating by the pot heating means to boil for a predetermined time. Keep boiling Rice cooker, characterized in that run and degree. 2. An inner pan, a main body for removably housing the inner pan, a lid attached to the main body, a pan heating means for heating the inner pan, and a pot for detecting a temperature of the inner pan. A temperature detection unit, a lid temperature detection unit that detects a temperature of the lid, and a rice cooker that controls the pan heating unit based on the temperature detected by the pan temperature detection unit and the lid temperature detection unit to cook rice. A rice cooker comprising control means for boiling water contained in the pan, wherein the control means comprises: a preheating step of preheating the inner pot to a predetermined temperature by the pan heating means; Performing a boiling step of heating water to boil, and a boiling maintaining step of reducing the amount of heating by the pan heating means and maintaining boiling for a predetermined time when the lid temperature detecting means detects boiling. Cooker cooker. 3. An inner pan, a main body for removably housing the inner pan, a lid attached to the main body, a pan heating means for heating the inner pan, and a pot for detecting a temperature of the inner pan. A temperature detection unit, a lid temperature detection unit that detects a temperature of the lid, and a rice cooker that controls the pan heating unit based on the temperature detected by the pan temperature detection unit and the lid temperature detection unit to cook rice. A rice cooker comprising control means for boiling water contained in the pot, wherein the control means comprises: a boiling preliminary step of heating the inner pot by the pot heating means for a predetermined time; Performing a boiling step of heating water to boil, and a boiling maintaining step of reducing the amount of heating by the pan heating means and maintaining boiling for a predetermined time when the lid temperature detecting means detects boiling. Cook rice cooker 4. An inner pan, a main body for removably housing the inner pan, a lid attached to the main body, a pan heating means for heating the inner pan, and a lid heating means for heating the lid A pot temperature detecting means for detecting a temperature of the inner pot; a lid temperature detecting means for detecting a temperature of the lid; a pot heating means based on the detected temperatures by the pan temperature detecting means and the lid temperature detecting means. And a control means for controlling the lid heating means to cook rice and boil the water contained in the inner pot, wherein the control means sets the lid body by the lid heating means for a predetermined time. A boiling preliminary step of heating, a boiling step of heating the water in the inner pot by the pot heating means to boil, and, when the lid temperature detecting means detects boiling, reducing the amount of heating by the pot heating means for a predetermined time. Boiling fiber to maintain boiling Rice cooker and executes the process. 5. The rice cooker according to claim 1, wherein heating by the lid heating means is performed for a predetermined time after or immediately before the end of the boiling maintaining step. 6. A predetermined time after the start of the boiling maintaining step,
2. The method according to claim 1, wherein the heating amount is reduced or set to zero.
5. The rice cooker according to any one of items 1 to 4. 7. The method according to claim 1, further comprising pressure adjusting means for adjusting the pressure in the inner pan to a constant pressure exceeding the atmospheric pressure in the boiling step and the boiling maintaining step. Rice cooker. 8. The rice cooker according to claim 7, wherein a lid is locked in a closed state when the inner pressure is adjusted by the pressure adjusting means. 9. The method according to claim 1, wherein when the pan temperature detecting means detects a predetermined empty cooking temperature, the heating by the pan heating means and the lid heating means is stopped and an error display is performed. 4. The rice cooker according to any one of 4.