JPH0975206A - Jar rice-cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent burning while obtaining heat sufficient for continuous boiling and eliminate wasteful consumption of every, in a jar rice-cooker whose pan is relatively thick. SOLUTION: A part of a pan which faces a rice-cooking heater has a thickness of 3mm or more. After a device is caused to start cooking rice, the pan is heated by the heater. When the rate of the increase of the temperature of the pan, detected by a temperature sensor, becomes lower than a specific value, the contents of the pan is assumed to be boiling, and the heating of the heater is stopped for a given time period (d). During this, the remaining heat of the pan whose heat capacity is large keeps the boiling. If the temperature of the pan does not drop after the given time period (d), the rice is assumed to have been cooked, and it is allowed to be steamed by its own heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jar rice cooker, and more particularly to a jar rice cooker having a relatively thick pot.

[0002]

[Problems to be Solved by the Invention] In a jar rice cooker, the pot in which the food is to be cooked usually has a material thickness of 0.7 to 2.5 m.
Although it is m, there is also one in which the material thickness is about 3 to 6 mm by casting or die casting. In a jar rice cooker equipped with such a thick pan and using an electric heater to heat the pan, the inside of the pan is relatively evenly heated and the rice can be cooked evenly. However, there is a problem that the remaining heat of the pan after heating the rice is large, and even if the heating of the heater is stopped, the sticking of the rice on the part in contact with the pan during the unevenness increases. This is because in the conventional heating control of the jar rice cooker, the heater continues to be heated even after the inside of the pan reaches a boiling state, and a rapid temperature rise caused by dry-up, that is, the water in the pan is exhausted, is detected. This is because the cooking was completed and the heating of the heater was stopped.

The present invention is intended to solve such problems, and an object of the present invention is to provide a jar rice cooker capable of reducing the sticking while continuing the boiling by utilizing the residual heat of the pot.

[0004]

In order to achieve the above object, the present invention relates to a jar rice cooker which performs a spot heating process after a rice cooking heating process, and a heating device and materials of a portion facing the heating device. It is equipped with a pan having a thickness of 3 mm or more, a control means for controlling the electrical connection and disconnection of the heating device, and a temperature sensor for detecting the temperature of the pan, and by the heating device after starting the rice cooking in the rice cooking heating process. Heating the pot, when the pot is almost boiling, stop the heating of the heating device for a predetermined time,
When the temperature of the pan rises above a predetermined temperature during this heating stop period, the heating process for rice cooking is terminated after the heating is stopped for the predetermined time, and the uneven heating process is performed.

With this configuration, the control means controls the power supply to the heating device in accordance with the temperature of the pan detected by the temperature sensor. In the rice cooking heating process, the pan is heated to the boiling state until it is almost boiled. The stroke is performed, and then, the boiling continuous heating stroke for continuing the boiling state as needed is performed. Furthermore, after the completion of the rice cooking heating step, a Murashi heating step, which is heating after cooking, is performed. By the way, since the material thickness of the pot is as thick as 3 mm or more at the portion facing the heating device, the pot has a large heat capacity and a time delay occurs in the temperature change depending on whether the heating device is heated or not. Therefore, after detecting the boiling state, the heating of the heating device is stopped for a predetermined time, the boiling state is continued only by the residual heat of the pan, and the temperature of the pan is kept at a predetermined temperature during the period when the heating of the heating device is stopped. If the temperature rises above the above, it is considered that the cooking has been completed, and the reheating is not performed by the heating device, and the unevenness heating step is performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a jar rice cooker according to the present invention will be described below with reference to the drawings. In FIG. 4, which is an overall cross-sectional view, 1 is a bowl body, 2 is a pan that is a bottomed cylindrical cooking container that is detachably accommodated in the bowl body 1, and 3 is the upper surface of the bowl body 1 and the bowl 2. It is a lid that covers the opening in an openable and closable manner. The container body 1 includes an outer frame 5 having an open lower surface, and a bottom plate 6 attached to the lower surface opening of the outer frame 5.
And a tubular first inner frame 7 that is an inner frame side member, and the first
The inner frame 7 is constituted by a second inner frame 8 which is an inner frame bottom member arranged so as to close the lower surface opening of the inner frame 7.

These first inner frame 7 and second inner frame 8
Are both made of an aluminum material and are assembled in the outer frame 5 to form an inner frame which is a container accommodating portion on the inner periphery of the container body 1. In particular, the second inner frame 8 forming the bottom of the container accommodating portion is not subjected to surface treatment but only degreasing treatment so that the radiant heat of the rice cooking heater described later can be efficiently reflected. Further, a brake bush 10 made of an elastic body on which a flange-shaped handle portion 9 formed in the upper portion of the pot 2 is placed is provided on the outer peripheral portion of the upper surface of the first inner frame 7. That is, the pot 2 is configured to be hung on the outer peripheral portion of the upper surface of the first inner frame 7 and accommodated in the inner frames 7 and 8.

Further, the pot 2 is made of aluminum having a high thermal conductivity as a material, and after being formed into a predetermined shape by a molding method such as casting aluminum die casting, the inner and outer surfaces of the pot 2 are made of fluorine resin. It is coated with the coding layer of the system. This makes it difficult for rice grains to adhere to the outer surface of the pot 2. The coating layer on the outer surface of the pot 2 may be made of silicone resin. Further, the material thickness of the pan 2 is thicker than that of a conventional normal pan and is 2 to 5 mm, preferably 3 to 4 mm.
In particular, the material thickness of the outer peripheral portion of the bottom of the pot 2 is 3 mm or more.

Reference numeral 11 denotes a rice cooking heater which is a heating device for heating the pot 2 with radiant heat. The rice cooking heater 11 is a ring-shaped sheathed heater. The rice cooking heater 11 is attached and fixed in a state of being separated from the second inner frame 8 by a heater base 12 made of a porcelain member provided on the second inner frame 8, and the bottom portion of the pan 2 Facing the outer periphery of the. The power consumption of the rice cooking heater 11 consisting of a sheathed heater is 1000-
It is set to 1300W. In the present embodiment, the rice cooking heater 11 is separated from the pan 2 and heats the pan 2 by radiant heat. However, a hot plate in contact with the pan 2 has a sheathed heater built-in. Alternatively, the sheathed heater may be fixed in contact with the heating plate. For example, the sheathed heater may be cast in an aluminum block and integrated so that the heating surface of a hot plate type heater is brought into contact with the bottom surface of the pan 2. However, it is preferable that the heating plate and the sheathed heater are not in contact with each other, as in this embodiment. Further, as the heating device, a space heater, a heating coil by induction heating, or the like can be used in addition to the sheath heater.

Reference numeral 13 is a heat plate which is a heat conductor provided so as to cover the rice cooking heater 11 from above in a non-contact state on the inner bottom portions of the inner frames 7 and 8. The hot plate 13 is formed by press-molding an aluminum plate into a predetermined shape and then subjected to an alumite treatment, and further, by secondary electrolytic alumite, nickel oxide-containing 5 to 10 μm, preferably 7 to 8 μm.
A heat resistant coating is formed with a film thickness of about a certain degree. In the state where the pot 2 is housed in the inner frames 7 and 8, the bottom of the bottom peripheral portion of the pot 2 is placed on the upper surface of the hot plate 13 located at the inner bottom of the inner frames 7 and 8. The heat of the hot plate 13 heated by the rice cooking heater 11 is transferred to the bottom of the pan 2 by the contact portion between the hot plate 13 and the pan 2. The contact portion between the heating plate 13 and the pan 2 is located directly above the rice cooking heater 11. Also, the hot plate 13
The material thickness of the pan 2 is 1-2 mm, preferably 1.2-1.5 mm. Therefore, as shown in FIG. 5, the material thickness of the pan 2 is at least at the contact portion between the hot plate 13 and the pan 2. The relationship between t1 and the material thickness t2 of the hot plate 13 is t1> t2. Furthermore, the outer periphery of the heating plate 13 and the first inner frame 7 and the second
A heating space 14 for supplying the radiant heat from the rice cooking heater 11 to the side portion of the pan 2 is formed between the inner surface of the inner frame 8 and the inner surface of the inner frame 8.

On the other hand, below the second inner frame 8, a support plate 16 as a heat shield plate made of a steel plate is provided while forming a space. The support plate 16 is provided so as to cover almost the entire lower side of the second inner frame 8, and has a heat shield function of blocking heat from the rice cooking heater 11 and is relatively weak in strength. Second inner frame 8
It is also designed to obtain the reinforcing effect of the aluminum material at the same time.
In addition, a temperature sensor 17 for detecting the temperature of the pan 2 is provided at the center of the support plate 16, and by providing this temperature sensor 17 inside the heat sensitive plate 18 which is strong in terms of strength, The temperature of the pan 2 can be detected. Heat sensitive plate 18
A switch lever 20 for switching the contact point of the pan switch 19 is provided below, and the heat sensitive plate 18 and the switch lever 20 are provided via a coil spring 21 so as to be vertically movable and biased upward. . And, the pot 2 is the main body 1
When accommodated inside, the bottom surface of the pan 2 rests on the heat-sensitive plate 18 protruding upward from the second inner frame 8, so that the heat-sensitive plate 18
And the switch lever 20 is pressed downward against the bias of the coil spring 21, and the contact point of the pan switch 19 is switched,
The presence or absence of the pot 2 is detected.

Reference numeral 22 is a coil spring for exerting an elastic force that constantly urges the hot plate 13 upward on the pan 2 side.
When the pan 2 is housed in the main body 1 of the pot, the hot plate 13
Is pressed against the outer bottom surface of the pan 2. As a result, even though the pot 2 is suspended by the upper portion of the first inner frame 7 as described above, the bottom surface of the pot 2 and the heating plate 13 can be brought into stable contact with each other. . The hot plate 13 is assembled from the upper side of the second inner frame 8 by
The support member 23 projecting downward of 13 is inserted into the holes 24 and 25 provided in common to the second inner frame 8 and the support plate 16, and the coil spring 22 and the coil spring 22 are provided from the lower side of the second inner frame 8. This is performed by mounting the support member 26 on the support member 23. The support member 26 is fixed to the bottom plate 6 and supports the hot plate 13 so as to be vertically movable via the support member 23.

Numeral 27 is a cord reel provided on the lower rear side of the bottom plate 6, and numeral 28 is a cylindrical horizontal heat shield plate which is erected between the outer frame 5 and the first inner frame 7. .

The lid 3 is an outer lid 31 forming an upper surface of the lid.
And an outer lid cover 32 that is provided below the outer lid 31 while forming a space, and a heat dissipation plate 33 that is provided below the outer lid cover 32 and that forms a lower surface of the lid body.
Below the heat dissipation plate 33, an inner lid 34 that closes the upper opening of the pan 2 is detachably provided. Outer lid 31 and outer lid cover 32
Is formed of a synthetic resin such as polypropylene, and the heat dissipation plate 33 is formed by subjecting the surface of an aluminum plate to an alumite treatment. A stud 35 is attached below the heat dissipation plate 33 by caulking, and an elastic inner lid retainer provided at the center of the inner lid 34 is attached to the stud 35.
36 is installed. Reference numeral 37 denotes a plurality of steam passages formed at appropriate positions on the inner lid 34. 38 is an outer lid cover 32 and a heat sink 33.
It is a ring-shaped lid packing that is sandwiched between and
When the lid body 3 is closed, the lower end of the lid packing 38 comes into close contact with the handle portion 9 of the pan 2. The lid 3 is a hinge shaft 39 in the left-right direction.
Is rotatably supported on the upper rear side of the outer frame 5 and is urged in the opening direction by a hinge spring 40 provided on the hinge shaft 39. The lid body 3 is held in the closed state by the hook button 41 against the hinge spring 40.

A steam port 45 for discharging steam generated in the pot 2 to the outside is provided at the rear part of the lid body 3.
The steam port 45 is composed of a steam port cover 46 made of synthetic resin forming the upper surface thereof, a part of the outer cover 32, and a steam port rubber 47 which also serves as packing and is fitted to the heat dissipation plate 33. There is. A steam cylinder 49 forming a steam passage hole 48 is vertically formed on the steam mouth rubber 47 so as to be integrated therewith. Further, one or a plurality of steam passage holes 50 are formed near the outer peripheral portion of the steam port cover 46. Reference numeral 51 is a return hole for discharging the wetting and water collected in the steam port 45, and 52 is an outer lid cover 32 and a heat radiating plate 33 surrounding the steam port 45.
It is a steam port packing provided between them. Then, the steam generated in the pan 2 is fed from the steam passage 37 of the inner lid 34 to the steam port rubber.
It enters the steam cylinder 49 of 47, passes through the space 53 in the steam port 45, and is discharged to the outside from the steam passage hole 50 of the steam port cover 46.

Reference numeral 55 is a lid heater for heat insulation provided on the back side, that is, the upper surface side of the heat dissipation plate 33. The lid heater 55 includes an aluminum foil 56 and a heat dissipation plate 33 which are adhered by a double-sided adhesive tape (not shown). A cord-shaped heating element is interposed between the two. In addition, above the lid heater 55, between the outer lid 31 and the outer lid cover 32, a heat insulating material 57 made of glass wool disposed near the steam port 45 is provided. Reference numeral 61 is a body heater including a cord heater for keeping heat, and the body heater 61 electrically forms a parallel circuit with the lid heater 55. The body heater 61 is made of the aluminum foil 62 bonded to the first inner frame 7
It is attached and fixed to the outer surface of. Reference numeral 63 is a pair of thermal fuses provided on the upper portion of the first inner frame 7.

An outer frame 5 and a horizontal heat shield plate are provided on the front side of the container body 1.
Power board 66 supported by power board support 65
And a display substrate 68 supported by the display substrate support 67, respectively. On the component side of the power board 66,
A plurality of electric components 69, 70 such as a buzzer, a transformer for forming a DC constant voltage circuit, a relay for controlling the on / off of the heaters 11, 55, 61 and a bidirectional thyristor are mounted. In addition, the display board 68 has a switch for starting rice cooking and heat retention, changing the process, and setting the timer time.
71, an LCD display unit 72 for displaying time, a process display lamp 73 including LEDs, a microcomputer (not shown), and the like are mounted. An operation panel 74 is mounted on the front surface of the outer frame 5 so as to cover one side of the display substrate 68, and the operation panel 74 includes the switch 71.
A push button 75 for operating the is provided, and a surface sheet on which various characters for explaining the display are printed.
76 is pasted.

FIG. 3 shows an outline of the electric circuit. In the figure, reference numeral 81 is a control means composed of a microcomputer or the like, and this control means 81 is prestored in accordance with the temperature of the pan 2 detected by the temperature sensor 17 and the data of the timekeeping device provided by itself. In accordance with the program, the rice cooker heater drive circuit 82 including a relay is used to control the on / off of the rice cooker heater 11, and the lid heater 55 and the body are connected via the heat retention heater drive circuit 83 including a bidirectional thyristor. This is for controlling the on / off of the heater 61.

Next, the operation of the above configuration will be described. When rice and water to be cooked are stored in the pan 2 and rice cooking is started, the rice cooking heater 11 is energized to heat the pan 2. Further, the lid heater 55 and the body heater 61 are also energized so that the lid heater 55 heats the heat dissipation plate 33 of the lid body 3, and the body heater 61 heats the first inner frame 7. As shown in FIGS. 1 and 2, the heating process of cooked rice until cooked is as follows:
It is done in the order of the boiling heating process until the inside of the pan 2 is in a boiling state, and then the boiling continuous heating process in which the boiling state is continued as needed. After the cooking rice heating process, the uneven heating for fully pregelatinizing the rice is performed. The stroke is performed, and then the heat retention stroke is performed. Before the rice cooking heating process, there may be a hot water cooking process that promotes water absorption of rice, and a timer waiting until the rice cooking starts at a set predetermined time.

In the boiling heating process, the rice cooking heater 11 is continuously energized to heat the pan 2 with a large heating amount. At that time, the temperature of the pot 2 detected by the temperature sensor 17 rises rapidly at first, and the gradient of the temperature rise decreases as the temperature approaches the boiling state. Then, when the temperature of the pot 2 becomes 90 ° C. or higher, it is judged whether or not the temperature of the pot 2 has risen to b ° C. (eg 5 ° C.) or less during a time (eg 120 seconds). When the gradient of the temperature rise of the pan 2 becomes b / a or less, it is considered that the inside of the pan 2 has almost reached the boiling state, the rice cooking heater 11 is cut off and the heating is stopped, and the boiling heating is performed. The process ends.

After completion of the boiling heating step, the rice cooking heater 11
The heating is stopped for a predetermined time d. This predetermined time d is the time of the boiling continuous heating process that should be ensured for good rice cooking, and is set to about 3 to 7 minutes. Then, the temperature of the pan 2 is judged at the time D when the predetermined time d has passed, and as shown in FIG. 1, the temperature P1 of the pan 2 at this time D is equal to or higher than the temperature P0 of the pan 2 at the end of the boiling heating process. If so, the boiling continuous heating process is completed at the time point D, and the uneven heating process is started. On the other hand, as shown in FIG.
If P1 <P0, the rice cooking heater 11 is energized again to heat. When the temperature P2 of the pot 2 becomes P2 ≧ P0 + 3 ° C., the rice cooking heater 11 is cut off and its heating is stopped, the boiling continuous heating process is completed, and the steaming heating process is started.
As described above, the heating of the rice cooking heater 11 is stopped for a predetermined time d after it is detected that the boiling state has been reached.
Unlike the conventional case where the heating of the rice cooking heater is continued during the boiling continuous heating process, the temperature of the pan 2 does not sharply rise even at the end of the boiling continuous heating process, which is the dry-up cooking time. .

In this uneven heating step, the rice cooking heater 11 is occasionally energized as needed to perform heating to such an extent that the boiling temperature state can be continued. Then, the uneven heating step is performed for a predetermined time e (for example, 15 minutes), and thereafter, the heat insulating step is performed. In this heat retention process, the temperature of the pot 2 is maintained at about 73 ° C. by heating the lid heater 55 and the body heater 61.

In this embodiment, since the material thickness of the pan 2 is as thick as 3 mm or more at least at the portion facing the rice cooking heater 11, the heat capacity of the pan 2 is large and the pan depending on whether the rice cooking heater 11 is heated or not. 2 causes a time delay in the temperature change. Therefore, as described above, after detecting the boiling state,
Even if the heating of the rice cooking heater 11 is stopped for a predetermined time d,
The boiling state in the pan 2 can be reliably continued only by the residual heat of the pan 2. If the temperature of the pan 2 does not drop at the time when the predetermined time d has passed, the rice cooking heater 11 is not reheated, and the steaming heating process is performed. Therefore, it is necessary and sufficient for good rice cooking. It is possible to prevent excessive heating while ensuring the continuation of the boiling state, prevent sticking from becoming strong, and cook rice without wasting energy. If the temperature of the pan 2 drops when the predetermined time d elapses, reheat with the rice cooker 11 until the temperature P2 of the pan 2 becomes P2 ≧ P0 + 3 ° C., and then the uneven heating process. I will move to
It is possible to reliably ensure the continuation of the boiling state that is necessary and sufficient for good rice cooking. Even in this case, the heating of the rice cooking heater 11 is temporarily stopped after the boiling and before the dry-up, so that the temperature of the pan suddenly rises (+10 It is possible to detect the cooked-up by a temperature increase of about + 3 ° C. from the time when the boiling is detected, and to prevent the burning. In addition,
Whether or not the rice heating heater 11 is reheated in the boiling continuous heating process depends on various conditions, but when the amount of rice cooked is small or medium, reheating is not performed first, and reheating is performed. This is only when the amount of rice cooked is large and the power supply voltage is low.

The numerical values such as a, b and d are not limited to those exemplified above, and may be arbitrarily set according to the heat capacity of the pan 2 and the amount of cooked rice. Regarding the setting according to the amount of cooked rice, for example, the actual amount of cooked rice is determined from the gradient of the temperature rise during the hot water cooking process, and values such as a, b, and d are automatically set at each cooked rice accordingly. You may do it. In particular, the predetermined time d should be longer as the amount of cooked rice increases. In the above embodiment, the condition for determining whether or not the rice cooking heater 11 is reheated in the boiling continuous heating process is determined by the temperature rise P1-P0 of the pot 2 during the period when the heating of the rice cooking heater 11 is stopped for a predetermined time d. Was determined to be 0 ° C or higher, the predetermined temperature for determining the temperature rise of the pan 2 is 0
The temperature is not limited to 0 ° C., and may be set higher or lower than 0 ° C. depending on conditions such as the heat capacity of the pot 2.

By the way, as in the jar rice cooker of this embodiment, a heating device such as a sheathed heater or a space heater in which a heating wire is wound around a mica plate is incorporated in a hot plate made of an aluminum plate, or a lower side of the hot plate. If the cooker is installed by making contact with the bottom of the hot plate, or by installing it under the hot plate, is there good contact between the hot plate and the cooking container such as a pan placed on the upper surface of the hot plate? Whether or not it is an important point in heating efficiency. If the contact is poor, the heating efficiency is lowered, the temperature rise of the food in the cooking container is delayed, and the cooking performance is deteriorated. Also,
If the contact is poor in some areas, the areas where the contact is good will be overheated, while the areas where the contact is bad will be weak in heating, causing uneven heating.

For these reasons, conventionally, the material thickness of the hot plate has been made relatively thick so that the contact does not deteriorate due to deformation at high temperature. However, when the material thickness of the hot plate is increased, there is a drawback that the quick heating property when heating the cooking container is deteriorated.
In order to compensate for this drawback, the material thickness of the cooking container is made relatively thin so that the temperature of the cooking container rises quickly, and the immediate heating property is improved. Therefore, conventionally, the material thickness of the cooking container is thinner than the material thickness of the hot plate.

In recent years, the heating capacity has been increased from about 800 W in the past to 1000 W or more to improve the immediate heating property of the food to be cooked, and in the same manner as in the jar rice cooker of the above-described embodiment, cooking is performed. The material thickness of the container has been increased from 2 to 1.5 mm, which was around 1 to 1.5 mm, to 2 mm or more, and a cooker that suppresses the uneven heating of the entire cooking container has been commercialized. As the material thickness of the container became thicker, the material thickness of the hot plate also became thicker, so the heat capacity of the hot plate becomes larger, and the effect of high power consumption is sufficient in terms of immediate heating. There was a problem that it was not exhibited, and the surroundings of the heating device below the hot plate became hot and the outer shell of the main body became hot.

On the other hand, in the jar rice cooker of the present embodiment, the relationship between the material thickness t1 of the pan 2 which is the cooking container and the material thickness t2 of the hot plate 13 is at least in the contact portion between the two.
Since t1> t2, the heat generated by the rice cooking heater 11 is
The temperature of the hot plate 13 rises quickly, as it quickly transfers to 13. Also,
Since the material thickness of the pot 2 in the part in contact with the hot plate 13 is thicker than that of the conventional one, the amount of heat conduction increases, and
The heat of the hot plate 13 is absorbed from the contact portion with the faster than the conventional case. That is, the hot plate facing the rice cooking heater 11
13 has a relatively thin material, which shortens the heat transfer time from the lower heat-receiving surface to the upper opposite surface, while the pot 2 has a relatively thick material, so that the heat of the hot plate 13 is reduced. Is quickly absorbed by the pan 2, and the quick heating property of the pan 2, which is the object to be heated, is improved. Further, the heat of the heating plate 13 is efficiently absorbed by the pan 2, so that the temperature rise of the heating plate 13 decreases as a result. Conventionally, it was thought that the material thickness of the hot plate should be thicker than that of the pan as described above, but when the material thickness of the pan 2 is as thick as 2 mm or more, the hot plate 13 is rather strong. It is effective to reduce the thickness of the material to the minimum necessary to secure it so that it can be quickly heated. According to the result of the experiment, when the material thickness of the hot plate 13 is 1.5 mm, the temperature of the hot plate 13 in the part not in contact with the pan 2 is 350 ° C, but when it is 1.2 mm, it drops to 300 ° C. However, if the material of the heating plate 13 is thin, the heat of the rice cooking heater 11 is more efficient.
It became clear that it was transmitted to the pot 2 via. That is, if the material thickness of the hot plate 13 is rather thin, the heating efficiency is good, and since the temperature of the hot plate 13 is lowered, excessive reinforcement is not required and durability is achieved even if the material thickness is thin. Therefore, the temperature rise around the hot plate 13 is reduced.

Further, since the pan 2 is constructed so as to be hung on the upper part of the inner frame 7 which is the pan housing part and housed in the inner frames 7 and 8, the hot plate 13 is not loaded with the weight of the pan 2. . Therefore, there is no risk of deformation of the hot plate 13 due to the load, and the hot plate 13
Even if the material thickness is reduced, there is no influence on the strength. Therefore, the material thickness of the heating plate 13 can be reduced to the necessary minimum thickness. Along with this, the heating plate 13 is a coil spring.
Since it is configured to be pushed upward by 22, the bottom surface of the pan 2 and the heating plate 13 can be in stable contact with each other, and the heat is efficiently and evenly transferred from the heating plate 13 to the pan 2.

Further, since the pot 2 is also supported by the upper portion of the first inner frame 7, the weight load of the pot 2 is hardly applied to the second inner frame 8 which is the inner frame bottom member. There is also an advantage that the material thickness of the second inner frame 8 can be reduced to, for example, about 0.5 to 1.5 mm. At the same time, since the second inner frame 8 does not need to be heat-resistant protected because it does not support the heat plate 13, it is possible to effectively utilize the infrared reflection characteristics inherent to aluminum without surface treatment. Therefore, the heating efficiency can be improved by improving the reflection efficiency.

Further, in the above embodiment, since the heating plate 13 and the rice cooking heater 11 are not in contact with each other, the local heat generation of the heating source is alleviated and the heating unevenness of the heating plate 13 is reduced, so that the heating plate 13 Can be prevented from thermal deformation.

As described above, according to the configuration of the above embodiment, the heating efficiency of the pan 2 is improved, the immediate heating property of the food to be cooked is improved, and the power consumption of the rice cooking heater 11 as a heating device is also increased. It is fully exerted and cooking performance is improved. In addition, since the material thickness of the pan 2 is thick, the entire inside of the pan 2 can be heated without unevenness of heat, and the cooking performance is further improved. In addition, since the heating efficiency of the food to be cooked is improved, the power consumption during cooking is reduced. Also hot plate
Since the temperature rise around 13 is suppressed, the bottom plate 6 and the outer frame 5 of the outer shell portion of the container body 1 do not become hot and the safety is improved. Further, since the heating plate 13 can be made thin, the weight of the entire rice cooker can be reduced.

The action and effect obtained by the above-described material thickness relationship between the cooking container such as a pan and the heat conductor such as a heating plate is not limited to the rice cooker as in the above-described embodiment, but an electric pot. , A hot plate or the like, which can be obtained in general cookers provided with a heat conductor between a cooking container and a heating device.

Further, the present invention is not limited to the above-mentioned embodiment, but various modifications can be made within the scope of the present invention. For example, in the above embodiment, the pot 2 is hung and supported on the upper portion of the inner frame 7, but the pot may be supported by being placed on the upper surface of the hot plate.

[0035]

According to the present invention, in a jar rice cooker equipped with a pan having a material thickness of 3 mm or more at a portion facing a heating device, the pan is heated by the heating device in the rice cooking heating step, When the temperature is almost boiling, heating of the heating device is stopped for a predetermined time, and if the temperature of the pan rises above a predetermined temperature during this heating stop period, the rice cooking heating process is terminated after the heating is stopped for the predetermined time and the uneven heating process is performed. As a result, the excess heat of the thick pot can be used to reliably perform continuous boiling heating, while excessive heating can be prevented, so that charring can be suppressed and energy efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a graph showing an embodiment of a jar rice cooker of the present invention and is a graph showing changes in pot temperature with time and timing of heating.

FIG. 2 is a graph showing a time-dependent change in pan temperature and a heating timing.

FIG. 3 is a block diagram showing an outline of an electric circuit of the same.

FIG. 4 is a sectional view of the entire same as above.

FIG. 5 is an enlarged view of the vicinity of the rice cooking heater of FIG. 4 above.

[Explanation of symbols]

 2 Pan 11 Rice cooker 17 Temperature sensor 81 Control means d Predetermined time

Claims (1)

[Claims] 1. A jar rice cooker for performing a nonuniform heating process after a rice cooking heating process, a heating device, a pot having a material thickness of 3 mm or more at a portion facing the heating device, and disconnection of the heating device. It is equipped with a control means for controlling electric power and a temperature sensor for detecting the temperature of the pan, and the pan is heated by a heating device after the start of rice cooking in the rice cooking heating step, and when the inside of the pan becomes almost boiling, it is heated. Stop heating the device for a predetermined time,
A jar rice cooker characterized in that if the temperature of the pan rises above a predetermined temperature during this heating stop period, the heating step for heating the rice is ended after the heating for the predetermined time, and the uneven heating step is performed.