JP5237194B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker, and more particularly to a rice cooker equipped with a fan in order to improve the accuracy of a room temperature sensor.

  Conventionally, in order to accurately control the heating of the inner pot of a rice cooker with a heater, it has been necessary to measure an accurate room temperature.

  For example, in Patent Document 1, a fan provided in the vicinity of a room temperature sensor is driven to introduce outside air, and this outside air is applied to the room temperature sensor, thereby reducing the influence of the heat of the heater and more accurately adjusting the room temperature. Rice cookers that can be measured have been proposed.

  However, in the rice cooker described in Patent Literature 1, when the room temperature is measured, the fan is driven for a predetermined time regardless of the room temperature and the remaining amount of rice, so that the time for generating noise by the fan becomes long. there were. In other words, conventionally, even if the time required for driving the fan varies depending on conditions such as the room temperature and the remaining amount of rice, the time required for driving the fan can be reduced because the drive time is set uniformly. It was necessary to set the driving time according to the longest conditions.

JP-A-9-430

  The present invention has been made in view of the above-described conventional problems, and measures the accurate room temperature and changes the fan driving time according to the room temperature and the remaining amount of rice, thereby generating noise by the fan. It is an object of the present invention to provide a rice cooker that can shorten the length.

A main body that houses the inner pot, a heating means that heats the inner pot to cook rice in the inner pot or keeps the cooked rice, a fan that takes outside air into the main body and cools the inside of the main body, and the heating In the rice cooker comprising the control means for controlling the means and the drive of the fan, and a room temperature sensor provided in the main body for measuring the room temperature,
When the room temperature previously measured by the room temperature sensor is high , the control means shortens the drive time of the fan during heat insulation.

  Here, the room temperature measured last time is the room temperature measured as recently as possible before the present time, and includes all of the temperature being kept before the start of cooking, after the start of cooking.

  When keeping warm, the control means changes the fan drive time according to the room temperature, so that the temperature inside the body where the room temperature sensor is placed is brought close to room temperature without driving the fan unnecessarily. Thus, the accurate room temperature can be measured. Therefore, it is possible to shorten the time for generating noise by driving the fan and to save energy.

When the room temperature is high, the temperature difference between the room temperature and the inside of the main unit where the room temperature sensor is arranged is small, so even if the fan drive time is shortened, the temperature inside the main body where the room temperature sensor is arranged is brought close to the room temperature. And accurate room temperature can be measured.

As other means, a main body that houses the inner pot, a heating means that heats the inner pot and cooks cooked rice in the inner pot or keeps the cooked rice, and takes outside air into the main body to cool the main body. In the rice cooker comprising a fan, a control means for controlling the heating means, a control means for controlling the driving of the fan, and a room temperature sensor provided in the main body for measuring a room temperature,
It is preferable that when the room temperature measured last by the room temperature sensor is low, the control means lengthens the drive time of the fan during the heat insulation.
If the room temperature is low, the temperature difference between the room temperature and the inside of the main body where the room temperature sensor is located is large. Therefore, by increasing the fan drive time, the temperature inside the main body where the room temperature sensor is located is brought closer to the room temperature. Accurate room temperature can be measured.

A lid disposed rotatably on the main body, and a lid state detecting means for detecting an open / closed state of the lid,
When the opening / closing of the lid is detected by the lid state detecting means, it is preferable that the fan is driven and the room temperature is measured by the room temperature sensor.

  When the opening / closing of the lid is detected, the fan is driven, so that the temperature inside the main body can be brought close to the room temperature and an accurate room temperature can be measured. Moreover, since opening and closing the lid leads to fluctuations in the remaining amount of rice, the accurate room temperature can be measured together with the remaining amount of rice.

A main body that houses the inner pot, a heating means that heats the inner pot to cook rice in the inner pot or keeps the cooked rice, a fan that takes outside air into the main body and cools the inside of the main body, and the heating And a control means for controlling the driving of the fan, a room temperature sensor provided in the main body for measuring the room temperature, and a rice amount estimating means for estimating the remaining amount of rice in the inner pot. In the rice cooker
The control means shortens the drive time of the fan during heat retention when the room temperature measured last time by the room temperature sensor is high and the remaining amount of rice estimated by the rice amount estimation means is small .

  During the heat insulation, the control means changes the fan driving time according to the room temperature state and the estimated remaining amount of rice, so that the inside of the main body where the room temperature sensor is arranged without driving the fan unnecessarily. An accurate room temperature can be measured by a room temperature sensor that brings the temperature close to room temperature. Therefore, it is possible to shorten the time for generating noise by driving the fan and to save energy.

  If the driving time of the fan is shortened, the time for generating noise due to the driving of the fan is shortened and energy saving can be achieved.

A main body that houses the inner pot, a heating means that heats the inner pot to cook rice in the inner pot or keeps the cooked rice, a fan that takes outside air into the main body and cools the inside of the main body, and the heating And a control means for controlling the driving of the fan, a room temperature sensor provided in the main body for measuring the room temperature, and a rice amount estimating means for estimating the remaining amount of rice in the inner pot. In the rice cooker
It is preferable that the control means lengthens the fan drive time during heat retention when the room temperature measured last by the room temperature sensor is low and the remaining amount of rice estimated by the rice amount estimation means is large.

  By extending the fan drive time, even if the temperature difference between the room temperature and the inside of the body where the room temperature sensor is located is large and the heat capacity of the rice is large, sufficient outside air is taken into the body to ensure accurate room temperature. Can be measured.

A lid disposed rotatably on the main body, and a lid state detecting means for detecting an open / closed state of the lid,
When the lid state detection means detects the opening and closing of the lid body, it is preferable that the rice amount estimation means estimates the remaining amount of rice, and the fan is driven to measure the room temperature using the room temperature sensor.

  Opening and closing the lid leads to fluctuations in the remaining amount of rice. Therefore, it is possible to estimate the remaining amount of rice by detecting the opening and closing of the lid, and to estimate the remaining amount of rice after the change. . Further, since the fan is driven when the opening / closing of the lid is detected, the temperature inside the main body can be brought close to the room temperature and the accurate room temperature can be measured.

Based on the room temperature measured by the room temperature sensor, the control means preferably executes cooked rice heat retention control. This makes it possible to perform appropriate heat retention control based on the accurate room temperature measured by the room temperature sensor. .

  According to the present invention, the control means changes the driving time of the fan according to the room temperature and the remaining amount of rice during the heat retention, so that the room temperature sensor is arranged inside the main body without driving the fan unnecessarily. The room temperature can be brought close to the room temperature, and the room temperature can be accurately measured by the room temperature sensor. Therefore, it is possible to shorten the time for generating noise by driving the fan and to save energy.

It is a fracture section and block diagram showing a rice cooker of an embodiment concerning the present invention. It is a disassembled perspective view of the lid | cover state detection apparatus arrange | positioned at the rice cooker of FIG. It is a fracture | rupture sectional drawing which shows the cover state detection apparatus of FIG. 2 of the state which open | released the cover body of the rice cooker of FIG. It is a flowchart which shows the cooked rice heat processing control which has the process of controlling fan drive time according to room temperature. It is a flowchart which shows the cooked rice heat processing control which has the process of controlling fan drive time according to the residual amount of rice. It is a flowchart which shows the cooked rice heat processing control which has the process of controlling fan drive time according to room temperature and the residual amount of rice.

  Next, a rice cooker according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a rice cooker 11 according to an embodiment of the present invention. The rice cooker 11 has a bottomed body 12, an inner pot 13 that is a container for containing cooked rice, and a hinge 12 that pivots around the hinge shaft 14. It is a well-known rice cooker consisting of the lid 15 made.

  An operation panel 18 having a plurality of switches 16 serving as input means such as a rice cooking menu and a liquid crystal panel 17 for displaying operation status and operation status is disposed on the front surface of the main body 12.

  Furthermore, a control board 22 supported by the board holder 21, a fan 23 for cooling the control board 22, and a room temperature sensor 24 for measuring the temperature inside the main body 12 are provided inside the front side of the main body 12. Yes. A microcomputer 26 serving as a control unit is mounted on the control board 22, and a fan 23 is driven based on a signal from the microcomputer 26. The outside air taken into the main body 12 from the suction port 28 by the fan 23 cools the inside of the control board 22 and the main body 12, passes between the inner pot 13 and the main body 12, and is discharged from the exhaust port 29. Thereby, since the temperature inside the main body 12 approaches the room temperature of the room where the rice cooker 11 is used, the room temperature sensor 24 provided inside the main body 12 can measure the room temperature more accurately.

  A tray-shaped protective frame 30 made of a non-conductive material and a cylindrical inner cylinder 31 made of a metal material provided above the protective frame 30 are arranged inside the main body 12. An induction heating coil 32 that is a heating means and a ferrite core 33 are disposed below the outer peripheral surface of the protective frame 30. A cylinder heater 34 as a heating unit is disposed on the outer peripheral portion of the inner cylinder 31. Further, the protective frame 30 is provided with an inner pot temperature sensor 35 that passes through the protective frame 30 and measures the temperature of the inner inner pot 13.

  On the lower side of the lower plate 41 provided on the lid 15, a lid heater 42 as a heating unit is disposed. The lid 15 is provided with a lid state detection device 43 that detects the opening and closing of the lid 15 and the opening and closing time. As the lid state detection device 43, for example, as shown in FIG. 2, a rocking member 44 is provided as a detection member on the lid 15 and the proximity and separation of the rocking member 44 is a non-contact type photo interrupter. A configuration of detecting by 45 may be employed. Thereby, the open / closed state of the lid 15 can be detected from the output signal of the photo interrupter 45, and the remaining amount of rice in the inner pot 13 can be estimated.

  The swing member 44 is swingably mounted by penetrating pins 51 in mounting holes 49 of a pair of support walls 48 of a holding mechanism 47 (see FIG. 2) provided on the upper side of the lower plate 41. The rocking member 44 includes a rod-shaped detection portion 53 that extends and is positioned below the stopper portion 52 at a predetermined interval. The swing member 44 is provided with a balance portion 59 that protrudes downward, and a mounting hole 61 corresponding to the mounting hole 49 is provided at an upper portion of the balance portion 59. A separate weight 62 is disposed at the lower end of the balance portion 59 so that the detection portion 53 is balanced in a state of extending in the horizontal direction.

  The photo interrupter 45 is mounted on a detection board 46 and detects the proximity and separation of the detection unit 53 of the swing member 44 in a non-contact state. The light interrupt unit 45 includes a light emitting unit 55 provided with a light emitting element and a light receiving element. The light receiving unit 56 is provided. The light emitting unit 55 and the light receiving unit 56 are disposed in opposing wall portions of a guide frame having a substantially U shape. The guide frame guides the swing member 44 so as to be movable in the facing space. Therefore, a part of the facing space constitutes a detection area. The photo interrupter 45 can receive the light of the light emitting element when the detection unit 53 that is a shielding object is not present in the detection region, and can detect the light of the light emitting element when the detection unit 53 enters the detection region. The light receiving element cannot receive light. Then, the light receiving state or the non-light receiving state, which means the detection state of the detection unit 53, is output to the microcomputer 26 as a predetermined signal. Specifically, as shown in FIG. 1, when the lid 15 is closed, the detection unit 53 exists in the detection region, so that the light receiving element cannot receive the light from the light emitting element, and the lid 15 is closed. The microcomputer 26 determines. On the other hand, when the lid 15 is open as shown in FIG. 3, the detection unit 53 does not exist in the detection region, so that the light receiving element can receive the light from the light emitting element, and if the lid 15 is open, the microcomputer 26. Judge.

  The detection results of the room temperature sensor 24, the temperature sensor 35 for the inner pot, and the lid state detection device 43 are input to the microcomputer 26. Further, the induction heating coil 32, the trunk heater 34, and the lid heater 42 are controlled based on a signal from the microcomputer 26.

  Next, although operation | movement of the rice cooker 11 is demonstrated, since rice cooking control is conventionally well-known, description is abbreviate | omitted and only the cooked rice heat retention process including fan control and heat retention control is demonstrated.

  The heat insulation control is executed based on the room temperature measured by the room temperature sensor 24 and the remaining amount of rice being kept warm. The remaining amount of the heat-retained rice is estimated by the microcomputer 26 by the rice amount estimating means based on the number of times the rice is scooped, that is, the number of times the lid 15 is opened and closed and the opening and closing time. For this reason, in order to execute appropriate heat retention control, it is required to estimate the remaining amount of rice in accordance with the timing at which the lid 15 is opened and closed and to measure the accurate room temperature by the room temperature sensor 24.

Therefore, the microcomputer 26 executes the cooked rice warming process shown in the flowchart of FIG.
This cooked rice warming process constitutes one subroutine during warming.
In step S1, it is detected whether or not the microcomputer 26 is keeping warm. If it is not during the heat retention, the cooked rice heat treatment is terminated. If the temperature is being kept, the process proceeds to step S2, and the open state of the lid 15 is detected based on the signal from the lid state detection device 43. If the open state of the lid 15 is not detected, the cooked rice warming process ends. If the open state of the lid 15 is detected, the process proceeds to step S3, and the remaining amount of rice in the inner pot 13 is estimated.

  The method for estimating the remaining amount of rice will be described below. When the user performs an opening operation of the lid body 15, the lid body 15 rotates to a position extending substantially upward as shown in FIG. 3. In the opened state of the lid 15, the upper edge 63 of the swing member 44 contacts the stopper 52, and the detection unit 53 of the swing member 44 moves away from the detection area of the photo interrupter 45, and the photo interrupter 45 is An on signal is output. The microcomputer 26 can determine the state in which the lid 15 is opened by detecting the state in which the photo interrupter 45 is outputting the ON signal. On the other hand, the microcomputer 26 can determine the state where the lid 15 is closed by detecting the state where the photo interrupter 45 is turned off.

  When the microcomputer 26 determines the open state of the lid 15, the microcomputer 26 estimates the remaining amount of rice remaining in the inner pot 13. Specifically, when cooking rice, since the induction heating coil 32 heats the inner pot 13 with a certain amount of heat, the rice being cooked by the rising gradient of the temperature of the inner pot 13 with respect to the heating time of the induction heating coil 32. Can be estimated. That is, when the remaining amount of rice is large, the temperature rise of the inner pan 13 is low with respect to the heating time of the induction heating coil 32, while when the remaining amount of rice is small, the heating time of the induction heating coil 32 is reduced. The fact that the temperature rise of the inner pot 13 is accelerated is utilized.

  And when cooking is complete | finished and it transfers to heat retention and it is necessary to open and close the cover body 15 when scooping rice. By detecting the opening / closing time of the lid 15 by the lid state detection device 43, the remaining amount of rice reduced is estimated. For example, if the opening time per lid 15 is within 9 seconds, 0.5 cups of rice will be reduced, and if it is 9 seconds or more, it will be calculated that 1 cup of rice has been reduced. By subtracting the remaining amount of cooked rice from the remaining amount of cooked rice, the remaining amount of rice in the inner pot 13 after opening and closing the lid 15 can be accurately estimated.

  When the remaining amount of rice is estimated, the process proceeds to step S3-1, where the microcomputer 26 reads the previous room temperature, and based on this, sets the drive time of the fan 23 executed in step S4. The previous room temperature is the room temperature measured by the room temperature sensor 24 as soon as possible before the current time, and includes all of the temperature being kept before the start of rice cooking, after the start of rice cooking.

  Here, the difference between the actual room temperature and the room temperature measured by the room temperature sensor 24, that is, the temperature inside the main body 12 in which the room temperature sensor 24 is arranged will be described. If the actual room temperature is 35 ° C. in the state where the fan 23 is kept warm, the temperature inside the main body 12 where the room temperature sensor 24 measured by the room temperature sensor 24 is 48.5 ° C. The difference is 13.5 ° C. If the actual room temperature is 5 ° C., the temperature inside the main body 12 where the room temperature sensor 24 measured by the room temperature sensor 24 is 27 ° C., and the difference is 22 ° C. That is, the lower the actual room temperature, the greater the difference from the room temperature measured by the room temperature sensor 24.

  In the present invention, in order to eliminate the above difference, for example, if the remaining amount of rice is medium, if the previous room temperature is 5 to 10 ° C., the driving time of the fan 23 is set to 60 seconds. Further, when the previous room temperature is 10 to 20 ° C., the driving time of the fan 23 is set to 52 seconds. Further, when the previous room temperature is 20 to 30 ° C., the driving time of the fan 23 is set to 44 seconds. And when the last room temperature is 30-40 degreeC, the drive time of the fan 23 is set to 36 second. By increasing the driving time of the fan 23 when the room temperature is low, the difference between the room temperature measured by the room temperature sensor 24 and the actual room temperature can be reduced, and a more accurate room temperature can be measured. Further, by shortening the driving time of the fan 23 when the room temperature is high, the accurate room temperature is measured, and the fan 23 is not driven unnecessarily, and the time for generating the noise by driving the fan 23 is shortened. , Can save energy. However, as long as the fan 23 is driven according to the room temperature and the difference between the room temperature measured by the room temperature sensor 24 and the actual room temperature is reduced, the driving time of the fan 23 is not particularly limited.

  In step S4, the microcomputer 26 drives the fan 23. In step S5, the microcomputer 26 measures whether or not a predetermined time has elapsed since the fan 23 was driven. Here, the predetermined time is the driving time of the fan 23 set according to the previous room temperature as described above. If the predetermined time has not elapsed, the process returns to step S4, and the fan 23 is driven until the predetermined time elapses. If predetermined time has passed, it will progress to step S6 and the room temperature sensor 24 will measure the temperature inside the main body 12 in which the room temperature sensor 24 is arrange | positioned. Next, it progresses to step S7 and the fan 23 is stopped based on the signal from the microcomputer 26. FIG. And it progresses to step S8 and the microcomputer 26 performs thermal insulation control on the basis of the room temperature measured by the room temperature sensor 24 in step S6 and the remaining amount of rice estimated by the lid state detection device 43 in step S3. After execution of this heat retention control, the cooked rice heat retention process is terminated.

  In the flowchart of the present embodiment, by detecting the opening and closing of the lid 15, the remaining amount of rice in the inner pot 13 is estimated, and at the same time, the fan 23 is driven, and the temperature inside the main body 12 is brought close to room temperature. Room temperature can be measured. Therefore, appropriate heat retention control can be executed based on the estimated remaining amount of rice and the accurate room temperature. Further, since the driving time of the fan 23 is changed according to the previous room temperature, the fan 23 is not driven unnecessarily, the time for generating noise by driving the fan 23 can be shortened, and energy saving can be achieved. That is, conventionally, since the driving time is set uniformly even when the time required for driving the fan varies depending on conditions such as room temperature and the remaining amount of rice, the time required for driving the fan is the longest. Although it is necessary to set the driving time according to the conditions, in the present invention, the driving time is changed according to the conditions, so that the driving time can be shortened.

  However, the cooked rice warming process is not limited to the above embodiment, and can be executed based on various flowcharts.

For example, the cooked rice warming process shown in the flowchart of FIG. 5 may be executed.
This cooked rice warming process is the same as the above except that Step S3-2 for reading the remaining amount of cooked rice is inserted between the estimation of the remaining amount of rice in Step S3 and the driving of the fan 23 in Step S4. This is the same as the flow of FIG.

  In the present embodiment, the microcomputer 26 reads the remaining amount of rice estimated in step S3 based on the opening / closing operation of the lid 15 detected by the lid state detection device 43 in step S2, and the microcomputer 26 reads in step S3-2. Based on this, the driving time of the fan 23 executed in step S4 is set. Since the heat capacity increases as the remaining amount of rice increases, the temperature inside the main body 12 in which the room temperature sensor 24 is arranged increases, and the inside of the main body 12 in which the room temperature sensor 24 is arranged even if outside air is taken in by the fan 23. It becomes difficult for the temperature of to approach room temperature. For this reason, when the remaining amount of rice is large, the drive time of the fan 23 is lengthened. On the other hand, since the heat capacity decreases as the remaining amount of rice decreases, the temperature inside the main body 12 in which the room temperature sensor 24 is arranged becomes low, and when the outside air is taken in by the fan 23, the main body in which the room temperature sensor 24 is arranged. The temperature inside 12 becomes easy to approach room temperature. For this reason, when the remaining amount of rice is small, the driving time of the fan 23 is shortened. Specifically, for example, if the room temperature is 20 ° C. to 30 ° C., and the remaining amount of rice is small, the driving time of the fan 23 is set to 28 seconds. When the remaining amount of rice is medium, the driving time of the fan 23 is set to 44 seconds. When the remaining amount of rice is full, the driving time of the fan 23 is set to 60 seconds.

  Since the driving time of the fan 23 is controlled in accordance with the remaining amount of rice, the fan 23 is not driven unnecessarily in order to accurately measure the room temperature, and the time for generating noise is shortened by driving the fan 23. At the same time, energy can be saved. That is, conventionally, since the driving time is set uniformly even when the time required for driving the fan varies depending on conditions such as room temperature and the remaining amount of rice, the time required for driving the fan is the longest. Although it is necessary to set the driving time according to the conditions, in the present invention, the driving time is changed according to the conditions, so that the driving time can be shortened. However, the driving time of the fan 23 is not particularly limited as long as the fan 23 is driven according to the remaining amount of rice and an accurate room temperature can be measured.

Moreover, you may perform the cooked rice heat retention process shown to the flowchart of FIG.
In this cooked rice warming process, the rice that has been warmed is read together with step S3-1 for reading the previous room temperature as information on driving the fan 23 between the estimation of the remaining amount of rice in step S3 and the driving of the fan 23 in step S4. 4 is the same as the flow in FIG. 4 except that step S3-2 for reading the remaining amount is inserted.

  In step S3-1, the microcomputer 26 reads the room temperature measured last time, and in step S3-2, the remaining amount of rice in the inner pot 13 estimated in step S3 is read. Based on the amount, the microcomputer 26 sets the driving time of the fan 23 executed in step S4. As shown in Table 1, the specific driving time of the fan 23 is longer as the room temperature is lower and the remaining amount of rice is larger. The driving time is longer as the room temperature is higher and the remaining amount of rice is smaller. The effect similar to the above can be acquired by shortening. However, the driving time of the fan 23 is not particularly limited as long as the fan 23 is driven according to the previous room temperature and the remaining amount of rice and the accurate room temperature can be measured.

DESCRIPTION OF SYMBOLS 11 Rice cooker 12 Main body 13 Inner pan 15 Cover body 23 Fan 24 Room temperature sensor 26 Microcomputer (control means)
32 Induction heating coil (heating means)
34 Body heater (heating means)
42 Lid heater (heating means)
43 Lid state detection device

Claims (7)

A main body that houses the inner pot, a heating means that heats the inner pot to cook rice in the inner pot or keeps the cooked rice, a fan that takes outside air into the main body and cools the inside of the main body, and the heating In the rice cooker comprising the control means for controlling the means and the drive of the fan, and a room temperature sensor provided in the main body for measuring the room temperature,
The said control means shortens the drive time of the said fan at the time of heat retention, when the room temperature measured last by the said room temperature sensor is high . A main body that houses the inner pot, a heating means that heats the inner pot to cook rice in the inner pot or keeps the cooked rice, a fan that takes outside air into the main body and cools the inside of the main body, and the heating In the rice cooker comprising the control means for controlling the means and the drive of the fan, and a room temperature sensor provided in the main body for measuring the room temperature,
The said control means lengthens the drive time of the said fan at the time of heat retention, when the room temperature measured last by the said room temperature sensor is low, The rice cooker characterized by the above-mentioned. A lid disposed rotatably on the main body, and a lid state detecting means for detecting an open / closed state of the lid,
3. The rice cooker according to claim 1, wherein when the opening / closing of the lid is detected by the lid state detection unit, the fan is driven and the room temperature is measured by the room temperature sensor. A main body that houses the inner pot, a heating means that heats the inner pot to cook rice in the inner pot or keeps the cooked rice, a fan that takes outside air into the main body and cools the inside of the main body, and the heating And a control means for controlling the driving of the fan, a room temperature sensor provided in the main body for measuring the room temperature, and a rice amount estimating means for estimating the remaining amount of rice in the inner pot. In the rice cooker
The control means shortens the drive time of the fan during heat retention when the room temperature measured last by the room temperature sensor is high and the remaining amount of rice estimated by the rice amount estimation means is small. Rice cooker. A main body that houses the inner pot, a heating means that heats the inner pot to cook rice in the inner pot or keeps the cooked rice, a fan that takes outside air into the main body and cools the inside of the main body, and the heating And a control means for controlling the driving of the fan, a room temperature sensor provided in the main body for measuring the room temperature, and a rice amount estimating means for estimating the remaining amount of rice in the inner pot. In the rice cooker
The control means extends the fan drive time during heat retention when the room temperature previously measured by the room temperature sensor is low and the remaining amount of rice estimated by the rice amount estimating means is large. Rice cooker. A lid disposed rotatably on the main body, and a lid state detecting means for detecting an open / closed state of the lid,
When the opening / closing of the lid is detected by the lid state detection unit, the remaining amount of rice is estimated by the rice amount estimation unit, and the fan is driven and the room temperature is measured by the room temperature sensor. Item 6. A rice cooker according to item 4 or 5 . The rice cooker according to any one of claims 1 to 6 , wherein the control means executes heat retention control of the cooked rice based on the room temperature measured by the room temperature sensor.

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