JP3562440B2 - Electric rice cooker - Google Patents

Description

[0002]
TECHNICAL FIELD OF THE INVENTION
[0003]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rice cooker, and more particularly, to an electric rice cooker configured to detect forgetting to attach a heat sink.
[Prior art]
[0004]
In an electric rice cooker, a heat sink for sealing the opening of the rice cooker is detachably provided on the lower surface of the lid when the lid is closed, and the heat sink is heated by a heating means (for example, an electric heater). It is well known that oneba is prevented from growing during rice cooking and is prevented from being exposed to a lid during heat retention.
[Problems to be solved by the invention]
[0005]
In the case of the electric rice cooker having the above structure, even when there is no radiator plate, the power can be supplied to the rice cooker and the heat retaining heater (that is, rice cooking and heat retention are possible). You may cook rice or keep warm without noticing that you forgot to attach. Then, at the time of cooking rice, rice is not cooked well due to insufficient internal pressure, and at the time of keeping heat, there occurs a problem that dew condensation on the lid occurs.
[0006]
The present invention has been made in view of the above points, and an object of the present invention is to detect a forgetting to attach a heat radiating plate, thereby making it possible to eliminate a problem at the time of cooking rice or keeping warm.
[Means for Solving the Problems]
[0007]
According to the first aspect of the present invention, as means for solving the above-mentioned problems, a rice cooker main body configured to be capable of removably storing a rice cooker, a lid of the rice cooker main body, and a lower surface of the lid An electric rice cooker which is detachably attached to a lid and which has a radiator plate for closing an opening of the rice cooker when the lid is closed, and a radiator plate heating means for heating the radiator plate; Temperature detecting means for detecting a temperature in the vicinity of the means, and a heat radiating plate detecting means for detecting forgetting to attach the heat radiating plate based on a time required for the detected temperature detected by the temperature detecting means to rise to a predetermined temperature, If the radiation plate detection means detects that the heat radiation plate has been forgotten to be mounted, the radiation plate detection device is provided with a notification device for reporting this.
[0008]
With the above configuration, the amount of heat conduction from the heatsink heating means changes greatly depending on the presence or absence of the heatsink, so that the temperature near the heatsink heating means detected by the temperature detection means rises to a predetermined temperature. The time required will also vary greatly. Therefore, the forgetting of the attachment of the heat sink is detected based on the time, and the user is notified of the forgetting of the attachment by the notifying means.
[0009]
According to the second aspect of the present invention, as a means for solving the above problems, a rice cooker main body configured to be capable of removably storing a rice cooker, a lid of the rice cooker main body, and a lower surface of the lid A radiator plate that is detachably attached to the lid and seals the opening of the rice cooker when the lid is closed, and an outer periphery of the radiator plate that is provided on a shoulder of the rice cooker main body and closes the lid when the lid is closed. In the electric rice cooker provided with a shoulder heater to which a part is pressed, a shoulder sensor for detecting the temperature of the portion is provided near the shoulder heater, and the lid is opened from the time when the lid is opened at the time of heat retention. Radiator detection means for starting temperature detection by the shoulder sensor and detecting forgetting to mount the radiator based on a change in the temperature rise within a predetermined time of the detected temperature; and mounting of the radiator by the radiator detect means When forgetting is detected, It is attached and informing means for knowledge.
[0010]
With the above configuration, if the temperature detection by the shoulder sensor is started from the time when the lid is opened at the time of keeping the temperature, the amount of heat conduction from the shoulder heater greatly changes depending on the presence or absence of the heat sink. The temperature rise of the temperature near the shoulder heater detected by the sensor also changes greatly. Therefore, the forgetting of the attachment of the heat sink is detected based on the degree of temperature rise, and the user is notified of the forgetting of the attachment to the notification means.
[0011]
According to the third aspect of the present invention, as a means for solving the above problems, a rice cooker main body configured to be capable of removably storing a rice cooker, a lid of the rice cooker main body, and a lower surface of the lid A radiator plate that is detachably attached to the lid and seals the opening of the rice cooker when the lid is closed, and an outer periphery of the radiator plate that is provided on a shoulder of the rice cooker main body and closes the lid when the lid is closed. In the electric rice cooker provided with a shoulder heater to which a part is pressed, a shoulder sensor is provided near the shoulder heater to detect the temperature of the portion, and power is supplied to the shoulder heater before rice cooking is started. A heatsink detecting means for detecting the forgotten mounting of the heatsink based on a change in the degree of temperature rise within a predetermined time of the detected temperature detected by the shoulder sensor, and the heatsink detecting means detects the forgotten mounting of the heatsink. Notifier who informs you when I have attached the door.
[0012]
With the above-described configuration, if power is supplied to the shoulder heater before the start of rice cooking, the amount of heat conduction from the shoulder heater greatly changes depending on the presence or absence of the heat sink, so that the vicinity of the shoulder heater detected by the shoulder sensor is detected. The degree of temperature rise also changes greatly. Therefore, the forgetting of the attachment of the heat sink is detected based on the degree of temperature rise, and the user is notified of the forgetting of the attachment to the notification means.
BEST MODE FOR CARRYING OUT THE INVENTION
[0013]
Hereinafter, some preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0014]
First Embodiment FIG. 1 shows an electric rice cooker according to a first embodiment of the present invention.
[0015]
As shown in FIG. 1, this electric rice cooker includes a rice cooker main body 1 including an outer case 4 forming an outer peripheral surface and a sheet metal protection frame 5 forming an inner peripheral surface, and the rice cooker main body 1. And a rice cooker 3 for heating a rice cooker 6 disposed on the inner bottom of the protective frame 5.
[0016]
The rice cooker 3 includes a heating plate 7 made of a good heat conductor having a shape enclosing the rice cooking device 6 from the bottom to a curved portion, and a heating element embedded in the heating plate 7 (for example, seeds). Heater 8).
[0017]
The outer case 4 includes a body 4 a serving as a side peripheral surface of the rice cooker main body 1, a shoulder 4 b serving as a joint with an upper edge of the protection frame 5, and a bottom serving as a bottom of the rice cooker main body 1. 4c, in the present embodiment, the body 4a and the bottom 4c are formed of an integrally molded product made of synthetic resin, and the shoulder 4b is formed separately. In some cases, the body 4a and the shoulder 4b may be formed of an integrally molded product made of synthetic resin, and the bottom 4c may be formed as a separate body. Reference numeral 9 denotes a temperature sensor for detecting the temperature of the rice cooker 6, reference numeral 10 denotes a heat retention heater, reference numeral 11 denotes a heat insulating material provided in the rice cooker main body 1, and reference numeral 12 denotes a handle for carrying the electric rice cooker.
[0018]
A synthetic resin shoulder ring 13 is attached to the inner peripheral edge of the shoulder portion 4b of the outer case 4 (in other words, the edge of the rice cooker main body 1) by force fitting. A metal heater ring 15 having a shoulder heater 14 acting as a radiator heating means for heating a radiator, which will be described later, is attached. As will be described later, the outer peripheral portion of the heat radiating plate 16 attached to the lower surface of the lid 2 is pressed against the upper surface of the heater ring 15 when the lid 2 is closed (in other words, comes into contact with heat conduction). It is supposed to be.
[0019]
Further, a shoulder sensor 17 acting as temperature detecting means for detecting the temperature near the shoulder heater 14 (that is, the heater ring 15) is provided at a terminal lead-out portion of the shoulder heater 14.
[0020]
On the other hand, the lid 2 is pivotally supported on a rear part of the outer case shoulder 4b via a hinge unit (not shown) so as to be openable / closable and detachable, and a synthetic resin upper plate 18 forming an upper surface. And a lower plate 19 made of synthetic resin, which forms a lower surface and is joined to the upper plate 18 at the inner and outer peripheral ends, and a space between the upper and lower plates 18, 19 is provided with a heat insulating material 20. Are arranged.
[0021]
An opening 21 is formed substantially at the center of the lid 2, and a pressure regulating cylinder 22 is detachably attached to the opening 21. At the lower end of the pressure adjusting cylinder 22, a heat radiating plate 16 for sealing the opening of the rice cooker 6 when the lid 2 is closed is fixed by screws 23. That is, the heat radiating plate 16 is detachable from the lid 2 via the pressure adjusting cylinder 22. The outer peripheral portion of the radiator plate 16 is to be pressed against the upper surface of the heater ring 15 when the lid 2 is closed, and the radiator plate 16 is moved from the shoulder heater 14 acting as a radiator heating means. Is to be heated by the heat conduction. Reference numeral 24 denotes a steam inlet to the pressure control cylinder 22, 25 denotes a steam outlet from the pressure control cylinder 22, 26 denotes a steam port formed in the heat radiating plate 16, 27 denotes a ball valve, and 28 denotes a heat radiating plate 16 and the rice cooker 6. Reference numeral 29 denotes a seal packing for sealing the lid 2 and the heat radiating plate 16, and reference numeral 30 denotes a seal packing attached to the outer periphery of the pressure regulating cylinder 22.
[0022]
The electric elements in the electric rice cooker having the above configuration are connected as shown in the block diagram of FIG. In addition, the same reference numerals are given to the already described electrical elements, and the detailed description is omitted.
[0023]
In FIG. 2, reference numeral 31 is a rice cooker switch, 32 is a warming switch, 33 is a cancel switch, 34 is a reservation switch, 35 is a menu switch, 36 is an hour switch, 37 is a minute switch, 38 is a rice cooker lamp, and 39 is a warming indicator. Light, 40 is a reservation indicator light, 41 is a liquid crystal display, 42 is a microcomputer unit (hereinafter abbreviated as a microcomputer), 43 is a commercial AC power supply, 44 is a rectifier circuit, 45 is a step-down transformer, 46 is a triac drive circuit, 47 is a relay drive circuit, 48 is a relay, 49 and 50 are triacs, 51 is a frequency synchronization signal input circuit, 52 is a temperature fuse, and 53 is a buzzer.
[0024]
The microcomputer 42 functions as a radiator detection means for detecting that the radiator 16 has been forgotten to be attached based on the temperature rise of the detected temperature T detected by the shoulder sensor 17 within a predetermined time t. When the means detects that the heat radiating plate 16 has been forgotten to be attached, it has a function as a notifying means for notifying (for example, performing an error display on the liquid crystal display unit 41 and giving a warning by the buzzer 53).
[0025]
Next, detection of forgetting to attach a heat sink in the electric rice cooker having the above configuration will be described in detail with reference to flowcharts shown in FIGS.
(I) Cooking rice (see flowchart in FIG. 3)
When cooking switch 31 is determined to have been ON at step S1, detection temperatures T ₁ by the shoulder sensors 17 are and stored is input to the microcomputer 42 in step S2. Next, in step S3, the shoulder heater 14 and the rice cooking heater 3 are energized to start rice cooking.
[0026]
Under this state, a predetermined time of t seconds is determined to have elapsed in step S4, the detected detection temperature T ₂ by the shoulder sensors 17 in step S5, the temperature rise of within a predetermined time t at step S6 T ₂ comparison of -T ₁ and the set value Tx is made. Here, the set value Tx is, as shown by a dotted line in FIG. 5, a temperature rise degree in a state where the heat sink 16 is attached.
[0027]
If it is determined that T ₂ -T ₁ <Tx in step S6 (i.e., if it is determined that the degree of temperature increase is small), the it is determined that the radiator plate 16 is attached, cooking process at step S7 Although it is continued, when it is determined that T ₂ −T ₁ ≧ Tx (that is, when it is determined that the degree of temperature rise is large), it is determined that the radiator plate 16 has been forgotten to be attached, and in step S8, The energization of the shoulder heater 14 and the rice cooking heater 3 is stopped (that is, the rice cooking is stopped), and a warning notification by the buzzer 53 and an error display on the liquid crystal display unit 41 are performed in step S9.
(II) During heat retention (see the flowchart in FIG. 4)
If it is determined in step S1 that the heat retention switch 32 has been turned ON, in step S2 the power is supplied to the shoulder heater 14 and the temperature retention heater 10 to start the heat retention. In step S3, the detected temperature T from the shoulder sensor 17 is input to the microcomputer 42. Then, in step S4, the detected temperature T is compared with the set value Ta. Here, the set value Ta is a temperature at which the temperature near the shoulder heater 14 (that is, the heater ring 15) drops when the lid 2 is opened, and is obtained in advance by an experiment or the like.
[0028]
If it is determined that T ≦ Ta in In step S4 (i.e., if it is determined that the lid body 2 is opened), the detection temperature T ₁ of by the shoulder sensors 17 are and stored is input to the microcomputer 42 in step S5.
[0029]
Under this state, a predetermined time of t seconds is determined to have elapsed in step S6, the detected temperature T ₂ by the shoulder sensors 17 are detected in step S7, the degree of temperature increase within a predetermined time t at step S8 T ₂ comparison of -T ₁ and the set value Tx is made. Here, the set value Tx is, as shown by a dotted line in FIG. 5, a temperature rise degree in a state where the heat sink 16 is attached.
[0030]
If in step S8 is determined T ₂ -T ₁ <Tx (i.e., if it is determined that the degree of temperature increase is small), the it is determined that the radiator plate 16 is attached, is returned to the step S1 However, when it is determined that T ₂ −T ₁ ≧ Tx (that is, when it is determined that the degree of temperature rise is large), it is determined that the heat sink 16 has been forgotten to be attached, and the shoulder heater 14 is determined in step S9. Then, the power supply to the heat retention heater 10 is stopped (that is, the heat retention is stopped), and a warning notification by the buzzer 53 and an error display on the liquid crystal display unit 41 are performed in step S10.
[0031]
As described above, in the present embodiment, since the degree of temperature rise near the shoulder heater 14 (in other words, the heater ring 15) within the predetermined time t greatly changes depending on the presence or absence of the heat radiating plate 16, the temperature rise The forgetting to attach the heat radiating plate 16 is reliably detected based on the degree, and the warning notification by the buzzer 53 and the error display on the liquid crystal display unit 41 allow the user to confirm the forgetting to attach the heat radiating plate 16.
[0032]
Second Embodiment FIGS. 6 and 7 show flowcharts relating to detection of forgetting to attach a heat sink at the time of cooking rice and at the time of keeping warm in an electric rice cooker according to a second embodiment of the present invention.
[0033]
In this case, the microcomputer 42 is, as a radiator plate detecting means for detecting the mounting forgetting of the radiator plate 16 on the basis of the time t required for the detected temperature T detected by a shoulder sensor 17 is increased from the temperature Ts ₁ in the temperature Ts ₂ The function and a function as a notifying means for notifying that the mounting of the heat radiating plate 16 has been forgotten by the heat radiating plate detecting means (for example, performing an error display on the liquid crystal display unit 41 and a warning by a buzzer 53). Have. Other configurations are the same as those in the first embodiment, and a description thereof will be omitted.
[0034]
Next, detection of forgetting to attach a heat sink in the electric rice cooker having the above configuration will be described in detail with reference to flowcharts shown in FIGS.
(I) During rice cooking (see the flowchart in FIG. 6)
When it is determined in step S1 that the rice cooker switch 31 has been turned on, the shoulder heater 14 and the rice cooker 3 are energized to start rice cooking in step S2, and the temperature T detected by the shoulder sensor 17 is input to the microcomputer 42 in step S3. In step S4, it is determined whether or not the detected temperature T has reached the _first set temperature Ts1, and if the determination is affirmative, the measurement of the time t is started in step S5.
[0035]
The time measurement is continued until it is determined in step S6 that the detected temperature T has reached the _second set temperature Ts2, and if an affirmative determination is made in step S6, the process proceeds to step S7 and the measured time t Is compared with the set value tx. Here, the set value tx is, as shown by a solid line in FIG. 8, a time required for a temperature rise in a state where the heat radiating plate 16 is not attached.
[0036]
If it is determined in step S7 that t ≧ tx (that is, if it is determined that the time required for the temperature rise is long), it is determined that the radiator plate 16 is attached, and the rice cooking process is continued in step S8. However, when it is determined that t <tx (that is, when it is determined that the time required for the temperature rise is short), it is determined that the radiator plate 16 has been forgotten to be attached, and in step S9, the shoulder heaters 14 and The energization of the rice cooking heater 3 is stopped (that is, the rice cooking is stopped), and a warning notification by the buzzer 53 and an error display on the liquid crystal display unit 41 are performed in step S10.
(II) During heat retention (see the flowchart in FIG. 7)
If it is determined in step S1 that the heat retention switch 32 has been turned ON, in step S2 the power is supplied to the shoulder heater 14 and the temperature retention heater 10 to start the heat retention. In step S3, the detected temperature T from the shoulder sensor 17 is input to the microcomputer 42. Then, in step S4, the detected temperature T is compared with the set value Ta. Here, the set value Ta is a temperature at which the temperature near the shoulder heater 14 (that is, the heater ring 15) drops when the lid 2 is opened, and is obtained in advance by an experiment or the like.
[0037]
If it is determined in step S4 that T ≦ Ta (that is, if it is determined that the lid 2 has been opened), it is determined in step S5 whether the detected temperature T has reached the _first set temperature Ts1. When the determination is affirmative, measurement of the time t is started in step S6.
[0038]
The time measurement is continued until it is determined in step S7 that the detected temperature T has reached the _second set temperature Ts2, and if an affirmative determination is made in step S7, the process proceeds to step S8 and the measured time t Is compared with the set value tx. Here, the set value tx is, as shown by a solid line in FIG. 8, a time required for a temperature rise in a state where the heat radiating plate 16 is not attached.
[0039]
If it is determined in step S8 that t ≧ tx (that is, if it is determined that the time required for the temperature rise is long), it is determined that the radiator plate 16 is attached, and the process returns to step S1. When it is determined that t <tx (that is, when it is determined that the time required for the temperature rise is short), it is determined that the radiator plate 16 has been forgotten to be attached, and in step S9, the shoulder heater 14 and the rice cooker 3 Is stopped (that is, rice cooking is stopped), and a warning is issued by the buzzer 53 and an error is displayed on the liquid crystal display unit 41 in step S10.
[0040]
As described above, in the present embodiment, since the time t required to rise to a predetermined temperature (that is, from Ts ₁ to Ts ₂ ) greatly changes depending on the presence or absence of the heat radiating plate 16, it is ensured based on the time t. When the user forgets to attach the heat radiator 16, the warning notification by the buzzer 53 and the error display on the liquid crystal display unit 41 can be confirmed by the user.
[0041]
In the above embodiment, the start of energization to the shoulder heater is performed at the same time as the start of energization to the rice cooker at the beginning of rice cooking, but may be performed before the start of energization to the rice cooker.
[0042]
Further, in the above-described embodiment, the detection of the forgetting to attach the heat radiator is performed only when the lid is opened at the time of keeping the temperature, but the detection of the forgetting to attach the heat radiator may be performed periodically. .
[0043]
In the above description, the embodiment in which the lid is detachable is described as an embodiment, but it is needless to say that the present invention can be applied to an object in which the lid is not detachable.
[0044]
In addition, although a description has been given of a device using a heater as a heating means for cooking rice, the present invention is also applicable to a device using an electromagnetic induction coil as a heating means for cooking rice.
【The invention's effect】
[0045]
According to the invention of claim 1, the rice cooker main body configured to be able to store the rice cooker in a removable manner, a lid of the rice cooker main body, and a detachably attached lower surface of the lid, In an electric rice cooker provided with a radiator plate for closing the opening of the rice cooker when the lid is closed, and a radiator plate heating means for heating the radiator plate, a temperature near the radiator plate heater is detected. Temperature detecting means, radiating plate detecting means for detecting forgetting to attach the radiating plate based on a time required for the temperature detected by the temperature detecting means to rise to a predetermined temperature, and radiating the heat by the radiating plate detecting means. A notifying means for notifying that the mounting of the radiator plate has been detected is provided, and the forgetting of the mounting of the radiator plate is detected based on the time required for the temperature near the radiator heating means to rise to a predetermined temperature. If you forget to attach Since so as to inform the, there is an effect that it is possible to reliably prevent the problem caused by performing the cooking or thermal insulation in a state of forgetting the mounting of the heat sink.
[0046]
According to the invention of claim 2 , the rice cooker main body configured to be able to store the rice cooker in a removable manner, a lid of the rice cooker main body, and a detachably attached lower surface of the lid, A radiator plate for closing the opening of the rice cooker when the lid is closed, and a shoulder heater provided on the shoulder of the rice cooker main body and being pressed against the outer peripheral portion of the radiator plate when the lid is closed. In the electric rice cooker provided with, in the vicinity of the shoulder heater, a shoulder sensor for detecting the temperature of the corresponding portion is provided, and at the time of keeping the temperature, the temperature detection by the shoulder sensor is started from the time when the lid is opened. A radiator detecting means for detecting the forgetting to attach the radiator based on a change in the degree of temperature rise within a predetermined time of the detected temperature, and when the radiator detecting means detects the forgetting to attach the radiator, this is detected. A notification means for notifying At this time, the temperature detection by the shoulder sensor is started from the time when the lid is opened, and the forgotten attachment of the heat sink is detected based on the temperature rise of the temperature near the shoulder heater detected by the shoulder sensor. Is notified to the user by the notifying means, so that it is possible to reliably prevent the occurrence of a problem caused by keeping the temperature while forgetting to attach the heat sink.
[0047]
According to the invention of claim 3, the rice cooker main body configured to be able to store the rice cooker in a removable manner, a lid of the rice cooker main body, and a detachably attached to the lower surface of the lid, A radiator plate for closing the opening of the rice cooker when the lid is closed, and a shoulder heater provided on the shoulder of the rice cooker main body and being pressed against the outer peripheral portion of the radiator plate when the lid is closed. In the electric rice cooker provided with a, near the shoulder heater, a shoulder sensor for detecting the temperature of the portion is provided, and power is supplied to the shoulder heater before the start of rice cooking, and the temperature detected by the shoulder sensor is detected. A heat sink detecting means for detecting the forgetting to attach the heat radiating plate based on a change in the degree of temperature rise within a predetermined time, and a notifying means for notifying when the heat radiating plate detecting means detects the forgetting to attach the heat radiating plate. To energize the shoulder heater It is performed before the start of rice cooking, and detects the forgetting to attach the radiator plate based on the temperature increase of the temperature near the shoulder heater detected by the shoulder sensor, and notifies the user of the forgetting of the attaching by the notification means, There is an effect that it is possible to reliably prevent the occurrence of troubles caused by cooking rice or keeping heat while forgetting to attach the heat sink.
[Brief description of the drawings]
[0048]
FIG. 1 is a longitudinal sectional view of an electric rice cooker according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a connection state of electric elements in the electric rice cooker according to the first embodiment of the present invention.
FIG. 3 is a flowchart showing the details of detection of forgetting to attach a heat sink during rice cooking in the electric rice cooker according to the first embodiment of the present invention.
FIG. 4 is a flowchart showing the details of detection of forgetting to attach a heatsink during heat retention in the electric rice cooker according to the first embodiment of the present invention.
FIG. 5 is a temperature characteristic diagram showing a calculation example of a set value Tx used when a heat sink is forgotten to be detected in the electric rice cooker according to the first embodiment of the present invention.
FIG. 6 is a flowchart showing the details of detection of forgetting to attach a heat sink at the time of cooking rice in the electric rice cooker according to the second embodiment of the present invention.
FIG. 7 is a flowchart showing details of detection of forgetting to attach a heatsink during heat retention in the electric rice cooker according to the second embodiment of the present invention.
FIG. 8 is a temperature characteristic diagram showing an example of calculating a set value tx used at the time of detection of forgetting to attach a heat sink in the electric rice cooker according to the second embodiment of the present invention.
[Explanation of symbols]
[0049]
1 is a rice cooker main body, 2 is a lid, 6 is a rice cooker, 14 is a heat sink heating means (shoulder heater), 16 is a heat sink, 17 is a temperature detecting means (shoulder sensor), 41 is a liquid crystal display, 42 is Microcomputer, 53 is a buzzer.

Claims (3)

A rice cooker main body configured to be able to store the rice cooker in a removable manner, a lid of the rice cooker main body, and a detachably attached lower surface of the lid, and the rice cooker when the lid is closed. An electric rice cooker comprising: a radiator plate for closing an opening of the radiator plate; and a radiator plate heating unit for heating the radiator plate, wherein the temperature detecting unit detects a temperature near the radiator plate heating unit; A heatsink detecting means for detecting the forgotten mounting of the heatsink based on a time required for the temperature detected by the detecting means to rise to a predetermined temperature; and the heatsink detecting means detects the forgotten mounting of the heatsink. An electric rice cooker, which is provided with a notification means for notifying the user when the electric rice cooker is in use. A rice cooker main body configured to be able to store the rice cooker in a removable manner, a lid of the rice cooker main body, and a detachably attached lower surface of the lid, and the rice cooker when the lid is closed. An electric rice cooker comprising: a radiator plate for closing an opening of the rice cooker; and a shoulder heater provided on a shoulder portion of the rice cooker main body and having an outer peripheral portion of the radiator plate pressed against the lid when the lid is closed. In the vicinity of the shoulder heater, a shoulder sensor for detecting the temperature of the portion is provided, and at the time of keeping the temperature, the temperature detection by the shoulder sensor is started from the time when the lid is opened, and the predetermined temperature is detected. A radiator detection means for detecting the forgetting to attach the radiator based on a change in the degree of temperature rise in the time, and a notifying means for notifying when the radiator detecting means detects the forgetting to attach the radiator. Electric rice cooker characterized by being attached A rice cooker main body configured to be able to store the rice cooker in a removable manner, a lid of the rice cooker main body, and a detachably attached lower surface of the lid, and the rice cooker when the lid is closed. An electric rice cooker comprising: a radiator plate for closing an opening of the rice cooker; and a shoulder heater provided on a shoulder portion of the rice cooker main body and having an outer peripheral portion of the radiator plate pressed against the lid when the lid is closed. In the vicinity of the shoulder heater, a shoulder sensor for detecting the temperature of the portion is provided, and power is supplied to the shoulder heater before rice cooking is started, and the temperature within a predetermined time of the detected temperature detected by the shoulder sensor is provided. A radiator detecting means for detecting the forgetting to attach the radiator based on a change in the degree of rise, and a notifying means for notifying that the forgetting to attach the radiator has been detected by the radiator detecting means is provided. Characterized electric rice cooker.

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