JPH09220161A - Thermos type rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a spewed hot water spill out of a steam port and thereby eliminate the uneven cooking of rice. SOLUTION: The tip opening part 13 of a pot 5 is directly covered with a lid 41, so that this designed structure void of an inner lid enables this rice cooker to be easily used from the practical operating point of view. In addition, the pot 5 is formed with a round bottom, so that the uneven heating of the top part of the pot 5 hardly occurs. A steam port 62 is provided almost in the center top part of the pot 5. Consequently, the heat blown up to the top part of the pot 5 from the heat generating part of the pot 5 is not released as a steam and therefore, the local shortage of a calorific value hardly occurs. In addition, a spewed hot water spill out of a steam port 62 is minimal, so that the calorific value need not be reduced. Thus the rice can be cooked without an uneven steaming phenomenon by keeping the calorific value at a high level, even if the inner lid is not provided.

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 in which an inner lid under a lid is removed.

[0002]

Conventionally, as a jar rice cooker of this type, for example, in Japanese Unexamined Patent Publication No. 7-204086, the upper opening of the pan is directly covered by the lower lid plate that forms the lower lid. So-called structure without inner lid (no inner lid)
Have been proposed. The jar rice cooker with such a structure does not require the work of attaching and detaching the inner lid, and since it is not necessary to clean the inner lid, it is easy to use, but in order to prevent spillage from the steam port to the outside, There is a drawback that the amount of heating when boiling is continued has to be made smaller than that with the inner lid, and the amount of heating tends to be insufficient, and cooking unevenness is likely to occur.

On the other hand, in recent years, a round-bottomed pan in which the outer peripheral portion of the pan bottom is formed into a curved surface has become mainstream, and the side surface of the pan is heated by heating or heating the position corresponding to the curved surface. The effect of suppressing uneven heating can be obtained by strengthening the temperature of the pot and efficiently causing the heat convection of the water in the heated pot from the heating portion to the upper portion along the inner surface of the pot. However, the steam port of the lid is provided on the outer peripheral side of the center of the lid, and the heat blown up from the heating part to the upper part is released to the outside as steam at the part with the steam port. It becomes easy for the outer peripheral part to partially cool. Also, since the steam is the strongest and there is a steam port at the upper part of the side of the pan that boiles violently during heating, spillage from the steam port to the outside is likely to occur, and it is necessary to reduce the amount of heating to the pan. Therefore, in this case as well, there is a drawback that the heating amount is insufficient and cooking unevenness is likely to occur as in the above case.

The steam port has a structure which can be attached and detached so that the inside of the vapor port can be cleaned. However, in the case where the vapor port can be attached and detached from the lower surface of the lid, it is necessary to open the lid for each attachment and detachment. There is. Moreover, since a large opening for attachment is required on the lower surface of the lid, the opening is likely to be cooled, and water droplets that condense during heat retention may collect in the steam outlet and drop on the upper surface of the rice. Furthermore, even if you forget to attach the steam port, you will not know that it is out of stock when the lid is closed, and there is a high possibility that you will cook rice or keep warm without the steam port.

In view of the above problems, the present invention suppresses spillage from the steam port to the outside and reduces uneven cooking even if the inner lid is eliminated and the pot has a round bottom shape. The first purpose is to provide a jar rice cooker that can be used.

A second object of the present invention is to easily attach and remove the steam port, to prevent the steam port from being cooled easily and to have good heat retention, and to reliably prevent forgetting to attach the steam port. To provide.

[0007]

In order to achieve the first object, the jar rice cooker of the present invention has a cylindrical shape with a bottom and a diameter of 25 to 75% of the diameter of the upper opening from the side. And a pan with a curved inner surface extending over the bottom surface,
The heating device includes a heating device for generating heat or heating the curved surface of the pot, a lid for covering the upper opening of the pot, and a steam port provided at a substantially central position of the pot on the lower surface of the lid.

[0008] In this case, since the lid has a structure for covering the upper opening of the pot, there is no need to attach and detach the inner lid,
In addition, it is practically easy to use because there is no need to clean the inner lid. In addition, since the bottomed cylindrical pan has a curved inner surface from the side surface to the bottom surface, by heating or heating the position corresponding to this curved surface portion,
The uneven heating can be suppressed by strengthening the heating of the side surface of the pan and efficiently causing the heat convection of the water in the heated pan from the heat generating portion to the upper part along the inner surface of the pan. Further, since the steam port is provided on the lower surface of the lid body located substantially in the center of the pot, it is possible to eliminate local shortage of heating amount due to partial cooling of the outer peripheral portion of the pot. At the same time, the steam generated from the entire circumference of the pan passes through the top surface of the rice in a state of uniformly covering the upper surface of the rice, and is discharged to the outside from the steam port in the substantially upper part of the center of the pan. For this reason, the steam heating on the upper surface of the pan becomes substantially even, and in particular, uneven cooking can be reduced on the upper part of the rice. Moreover, since the steam port is not arranged at the upper part of the side surface of the pan, which is heated most strongly and boiled violently during heating, there is little spillage from the steam port to the outside. Therefore, it is not necessary to extremely reduce the amount of heating to the pan,
Even when there is no inner lid, the amount of heat can be increased and rice can be cooked with less unevenness.

In order to achieve the second object, the invention according to claim 2 is characterized in that, in the jar rice cooker according to the invention according to claim 1, the steam port is detachable from the outside of the lid. It is provided and configured.

In this case, even if the lid is not opened,
The steam port can be easily attached and detached. In addition, it is not necessary to provide a large opening on the lower surface of the lid to install a steam port, and this can improve the poor heat retention that makes it easier to cool the opening, and water droplets that have condensed during heat retention can collect in the steam port. It becomes difficult, and the problem of dripping on the upper surface of rice can be suppressed. Further, even if the steam port is forgot to be attached, it is possible to immediately determine the missing item with the lid closed, and it is possible to reliably prevent the risk of rice cooking and heat retention without the steam port.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described with reference to the drawings. In FIG. 1 showing an overall cross-sectional view, reference numeral 1 denotes a container body, which is a bottomed cylindrical inner frame 2 having an open top surface and an outer shell provided with the inner frame 2 to form an outer shell of the container body 1. It is composed of a frame 3 and a bottom plate 4 that covers the bottom side of the outer frame 3. The inner frame 2 which is a container housing portion is made of glass fiber-containing PET resin, and is formed in a shape substantially similar to the outer surface shape of the pan 5 which is detachably housed in the inner frame 2.

The shape of the pan 5 for containing rice, which is rice to be cooked, and water is a cylindrical shape having a bottom with an open top.
At the top of the outer surface of the pot 5, a flange-shaped handle 6 projecting horizontally outward is formed. The pan 5 is supported in a hung state by the handle portion 6 being placed on the upper end surface of the outer frame 3, and between the inner frame 2 and the pan 5 housed therein.
Except for the handle 6, a predetermined gap 7 of 1 to 4 mm is formed. The pot 5 is provided with a pot main body 8 mainly composed of, for example, an A3004 type aluminum material having excellent heat conductivity and corrosion resistance, and is provided from the outer bottom surface to the lower side of the pot main body 8. The heat generating layer 9 is made of a magnetic metal material.

Here, the overall shape of the pot 5 will be described in detail with reference to the enlarged sectional view of FIG. The outer surface of the pan 5 is connected to the lowermost portion 11 of the outer bottom surface of the pan 5 while the diameter decreasing rate increases as the height decreases from approximately the middle of the total height H or about 1/3 of the total height H to the lower side. It has a curved vertical section, and when the pot 5 is placed on a flat table surface or the like, the bottom portion 11 of the pot 5 contacts the table surface or the like. The outermost peripheral portion 12 of the inner bottom surface facing the outermost peripheral portion of the lowermost portion 11 of the pot 5 has a diameter A1 of 25% to 75% (1/4 to 3%) of the diameter A2 of the upper opening 13 of the pot 5. / 4). The inner side surface of the pot 5 has a vertical cross-sectional shape that is substantially along the outer side surface of the pot 5, and is located at the middle of the total height H or the side surface at a height of about 1/3 of the total height H to the bottom.
A curved surface is formed from the bottom surface facing 11.
It should be noted that the side surface referred to here is an upper surface opening including the handle 6.
From 13 to the outermost peripheral portion of the lowermost portion 11 (a portion located in the outermost peripheral portion 12) that contacts the table surface, etc., the curved surface portion 14 having the curved inner surface from the lower portion of the side surface to the bottom surface is It is formed. The heat generating layer 9, which is a heat generating portion of the pot 5, is formed on the outer surface of the curved portion 14 of the pot 5.

Returning to FIG. 1 again, reference numeral 21 is a heating coil provided outside the inner frame 2 and corresponding to a heating device for heating the heating layer 9 of the pan 5 by electromagnetic induction. The heating coil 21 is spirally wound and fixed on the outer surface of the inner frame 2 at a position facing the heat generating layer 9 of the curved surface portion 14 from the lower side surface to the bottom surface of the pan 5. Although the heating coil 21 may be disposed in a portion other than this portion, it is preferably provided at least at a position facing the curved surface portion 14 of the pot 5. The reason is that heat convection of water in the pan 5 is likely to occur during rice cooking. On the outside of the heating coil 21, a coil cover 22 having an insulating property, which is a mixture of a plastic material and a material having a high magnetic permeability mainly including iron oxide, is provided. Further, 23 is a pan temperature sensor which is provided near the heating layer 9 of the pan 5 and has a negative characteristic thermistor inside, and 24 is located near the heating layer 9 and the heating coil 21 and The thermal fuse is provided on the outer surface of the frame 2.

Reference numeral 26 is a heating board provided with an inverter circuit component 27 for supplying a predetermined high frequency current to the heating coil 21. The heating substrate 26 is disposed between the bottom of the vessel body 1 and the support 28 together with the cooling fan 30 having the motor 29 by the support 28 provided inside the vessel body 1. An intake port 31 is provided at the bottom of the bottom plate 4 facing the cooling fan 30, and the bottom plate 4 facing one side of the heating substrate 26 is provided.
An exhaust port 32 is provided on the side surface of the. The support 28 is provided in an upright state on one side of the heating substrate 26, and between the support 28 and the front surface of the device body 1, an LCD 33, an LED 34, and various types of LCDs forming an operation panel 33 as a display operation means. The display operation component 36 including the switch 35 and the power supply circuit component 37 other than the inverter circuit component 27 are provided mounted on the substrate 38. When the cooling fan 30 is rotated by energizing the motor 29, the air taken in from the intake port 31 is sent out from the heating substrate 26 to the exhaust port 32 through the substrate 38, and the air flows between the support 28 and the bottom plate 4. Each part in the space surrounded by is forcibly cooled. Reference numeral 39 is a cord reel for winding the power cord 40 provided on the lower rear side of the outer frame 3.

Reference numeral 41 is a lid that covers the upper opening 13 of the pot 5 so as to be openable and closable. This lid 41 is a plastic outer lid 42.
And an outer lid cover 43 provided along the outer periphery of the lower side of the outer lid 42, and attached while forming a space below the outer lid 42,
A lid lower surface plate 44 made of an aluminum material that forms the lower surface of the lid 41 and directly covers the upper opening 13 of the pot 5. Reference numeral 45 denotes a lid packing held between the outer lid cover 43 and the lid lower surface plate 44. A hinge shaft 46 is rotatably supported on the upper rear surface of the container body 1, and a lid 41 on the opposite side of the hinge shaft 46 or a front side of the device body 1 is a clamp for locking the lid body 41 and the device body 1. Button 47 is provided. Although not shown, an elastic member such as a torsion coil spring for urging the lid body 41 in the direction of always opening the hinge shaft 46 is provided inside the hinge shaft 46. The lid 41 can be opened with the hinge shaft 46 as the center of rotation. A code heater 48, which is a lid heater for heating the lid lower surface plate 44, is provided on the upper surface, that is, the back surface of the lid lower surface plate 44. The cord heater 48 electrically forms a parallel circuit with a side heater 53 such as a cord heater that keeps the inner frame 2 warm. Further, a lid temperature sensor 49 including a negative characteristic thermistor for detecting the temperature of the lower surface of the lid body 41 is provided on the back side of the lid lower surface plate 44. The code heater 48 and the lid temperature sensor 49 are
The upper surface of each of them is covered with an aluminum foil 50, and a heat insulating plate 51 is attached and fixed together with the outer lid cover 43 and the lid lower surface plate 44 to the upper surface of the aluminum foil 50 while forming a predetermined space. Reference numeral 52 is a sensor retainer for holding the lid temperature sensor 49 on the upper surface of the lid lower surface plate 44.

Reference numeral 61 denotes a steam entrance hole of a steam port 62 provided at a substantially center of the lid lower surface plate 44, that is, at a substantially center of the pot 5, from which the steam enters the steam hole 62. It is configured to enter. Here, also referring to FIG. 3, the steam port
The configuration of 62 will be described in detail. On the upper surface of the outer lid 42, a recess 63 for mounting the steam port 62 is provided. Also, the steam port 62 is
A steam port cover 65 having a steam discharge port 64 formed on the upper surface,
The steam port cover 65 includes a bottomed tubular bucket 66 that is vertically movable. A protrusion 67 that is engaged with the wall surface of the recess 63 is formed on the upper part of one side of the steam port cover 65, and the engagement and disengagement of the protrusion 67 with the recess 63 allows the steam port 62 to be attached and detached from the outside of the lid 41. be able to. Also, 68 is
A steam port packing provided between the lower end of the recess 63 and the lid lower surface plate 44. When the steam port 62 is mounted in the recess 63, the lower part of the steam port cover 65 comes into contact with the steam port packing 68. ing. On the other hand, the bottom surface of the bucket 66 is placed on the upper surface of the lid lower surface plate 44 exposed on the inner bottom surface of the recess 63,
It is configured to close the vapor penetration hole 61 formed in the. Further, a partition plate 72 having a plurality of communication holes 71 for communicating the inside and outside of the bucket 66 is provided in the upper opening of the bucket 66. At the center of the bottom surface of the bucket 66, there is a return hole 73 for letting back the water (starch-melted water) collected inside the bucket 66 when cooking rice. This return hole 73 is made of an elastic material such as silicone rubber. The check valve 74 is closed. Therefore, the steam generated during the rice cooking enters through the steam entry hole 61 and abuts against the bottom surface of the bucket 66,
At this time, the bucket 66 is pushed upward by the pressure of the steam from the lid lower surface plate 44, passes through the steam passage hole 75 formed between the outer surface of the bucket 66 and the inner surface of the steam port cover 65, and then the steam port cover. Steam is discharged to the outside of the lid 41 from the steam discharge port 64 on the upper surface of the 65. After that, when the cooking of rice is finished and the heating is stopped to shift to the unevenness, the check valve 74 moves to the pot 5 side due to the negative pressure in the pot 5, forming the lower part of the check valve 74. From between the tongue 76 and the return hole 73, the bucket 66
The tonnage that has accumulated inside the container returns to the pot 5 side.

In the above structure, when a high frequency current is supplied to the heating coil 21 from the inverter circuit mounted on the heating substrate 26, an alternating magnetic field is generated in the heating coil 21 and the heating layer of the pan 5 located in the magnetic field. An eddy current is generated in 9 and the eddy current is converted into Joule heat, whereby the heat generating layer 9 generates heat to heat the cooked rice in the pot 5.

As described above, in the rice cooker of this embodiment, the upper opening 13 of the pan 5 is made not by the inner lid but by the lid lower surface plate 44 of the lid 41.
Since it has a structure for covering the inner cover, there is no need to remove the inner cover and there is no need to clean the inner cover, so it is practically easy to use. Further, the bottomed cylindrical pot 5 has a curved inner surface from the side surface to the bottom surface having a diameter A1 of about 25 to 75% of the diameter A2 of the upper opening 13. By heating the position corresponding to the curved surface portion 14, the side surface of the pan 5 is heated more strongly, and the heat convection of the heated water in the pan 5 is efficiently conducted along the inner surface of the pan 5 from the heat generating part to the upper part. By performing the heating frequently, uneven heating can be suppressed. Further, since the steam port 62 is provided not on the outer peripheral portion of the lid body 41 but on the lid lower surface plate 44 located substantially in the center of the pot 5, the heat blown upward from the heat generating portion as it is in the conventional case is the steam port. The steam is not discharged from 62 to the outside, and the local shortage of heating amount due to the partial cooling of the outer peripheral portion of the pan 5 can be eliminated. at the same time,
The steam generated from the entire periphery of the pan 5 passes in a state of uniformly covering the upper surface of the rice in the pan 5 and is discharged to the outside from the steam port 62 at the substantially upper center of the pan 5. The steam heating on the upper surface of No. 5 becomes substantially even, and it becomes possible to reduce the uneven cooking especially on the upper part of the rice. In addition, since the steam port 62 is not arranged at the upper part of the side surface of the pan 5 which is heated most strongly and is boiled violently during heating, there is little spillage from the steam port 62 to the outside. For this reason, it is not necessary to extremely reduce the heating amount to the pan 5, and the heating amount can be increased even without the inner lid, and the rice can be cooked with less unevenness as a whole.

That is, the bottomed cylindrical pot 5 has a diameter A1 which is about 25 to 75% of the diameter A2 of the upper opening 13 from the side surface thereof.
And a heating coil 21 that forms a curved inner surface toward the bottom surface of the pan 5 and that heats or heats the curved surface portion 14 of the pot 5, a lid 41 that covers the upper opening 13 of the pot 5, and the lid 41. By having the steam port 62 provided at the approximate center position of the pan 5 on the lower surface of the pan, the convenience of practical use by eliminating the inner lid and the upper part of the pan 5 by making the pan 5 round-bottomed It is possible to suppress the spillage from the steam port 62 to the outside as compared with the related art, while making the most of the uneven heating. Further, this eliminates the need to extremely reduce the heating amount, so that it is possible to reduce uneven heating due to insufficient heating amount.

When the diameter A1 of the outermost peripheral portion 12 of the pot 5 is less than 25% of the diameter A2 of the upper opening 13, the placing surface of the pot 5 on the table or the like becomes extremely small and the pot 5 Stability becomes poor when placed. On the contrary, when the diameter A1 of the outermost peripheral portion 12 exceeds 75% of the diameter A2 of the upper opening 13, the side surface of the pot 5 rises sharply with respect to the bottom surface, and the pot 5 has a round bottom shape. The favorable effect is lost. It is for this reason that the diameter A1 of the outermost peripheral portion 12 of the pot 5 and the diameter A2 of the upper opening portion 13 are defined in the above relationship.

In this embodiment, the steam port 62 is detachably provided from the outside of the lid 41. Therefore, each lid 41
The steam port 62 can be easily attached and detached without opening the. Further, the lid lower surface plate 44 does not need to be provided with a large opening through which the steam port 62 can be attached, and this can improve the poor heat retention property that makes it easier for the opening to cool, and the water droplets that have condensed during the heat retention can be discharged to the steam port. It is less likely to collect and the problem of dripping on the upper surface of rice can be suppressed. In addition, even if you forget to attach the steam port 62, you can immediately determine the missing item with the lid 41 closed, and reliably prevent the risk of rice cooking and heat retention without the steam port 62. can do. This is also a manufacturing advantage that can prevent the steam port 62 from running out during assembly.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, although the electromagnetic induction heating type jar rice cooker is referred to in the embodiments, other heating type jar rice cookers that heat a pan with a sheath heater, which is a heating device, may be used.

[0024]

The jar rice cooker according to the first aspect of the present invention is a pot having a bottomed cylindrical shape and a curved inner surface formed from the side surface to the bottom surface having a diameter of 25 to 75% of the diameter of the upper opening. , A heating device that heats or heats the curved surface of this pot,
It consists of a lid that covers the upper opening of the pot, and a steam port provided at the lower surface of the pot at a substantially central position of the pot. The inner lid is eliminated and the pot has a round bottom shape. Even with the configuration, it is possible to suppress spillage from the steam outlet to the outside and reduce uneven cooking.

Further, the jar rice cooker of the invention of claim 2 is
In addition to the structure of claim 1, the steam port is detachably provided from the outside of the lid body. In addition to the function and effect of claim 1, the steam port is easily removable, and the steam port is attached. It is possible to obtain a jar rice cooker that does not easily get cold, has good heat retention, and can reliably prevent forgetting to attach a steam port.

[Brief description of drawings]

FIG. 1 is an overall sectional view of a jar rice cooker showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the same pot.

FIG. 3 is an enlarged cross-sectional view around the steam port of the same.

[Explanation of symbols]

 5 Pan 13 Upper opening 14 Curved surface 21 Heating coil (heating device) 41 Lid 62 Steam port A1, A2 Diameter

Claims (2)

[Claims] 1. A cylinder having a bottom and a diameter of 2 from the side to the upper opening.
A pan having a curved inner surface extending toward the bottom surface having a diameter of about 5 to 75%, a heating device for heating or heating the curved surface of the pan, and a lid for covering the upper opening of the pan.
A jar rice cooker comprising a steam port provided at a substantially central position of the pot on the lower surface of the lid body. 2. The jar rice cooker according to claim 1, wherein the steam port is detachably provided from the outside of the lid.