JPH09262175A - Rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent blowing-over of a sticky component in rice billing with a rice cooker having no inner lid while the merit of omission of such lid is made use of. SOLUTION: The central part 44D of an undersurface plate 44 of lid is formed higher than the peripheral part 44C and provided with a steam intrusion hole 61. This hole 61 is positioned farthest from the peripheral upper part of the inside surface of a deep pan 5 where the strongest seething is made by heating of the side face of the pan 5, and its positioning in rice bolding will be such that the sticky components will never blow over. Cord heaters 48, 48A are furnished in the neighborhood of the outside part 44C and the steam intrusion hole 61. This structure suppresses bedewing of the oversurface 5A and a vapor port 62 which are likely to be cooled with the external air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker in which an inner lid at the bottom of a lid is removed, and in particular, a spillage during rice cooking is suppressed to ensure an appropriate amount of heat for cooking rice with less unevenness in cooking. Prevents stains on the lid due to spillage and reduces the amount of drainage of the sauce when the lid is opened after the rice has been kept warm to prevent it from becoming soiled with the sauce.
Further, the present invention relates to a rice cooker capable of suppressing the temperature unevenness of the pot during heat retention and reducing the adhesion of soup sauce to the inner surface of the pot.

[0002]

Conventionally, as a rice cooker of this type, for example, in Japanese Unexamined Patent Publication No. 7-204086, a so-called lid bottom plate which forms a lower portion of the lid directly covers the upper opening of the pan. A structure without an inner lid (without an inner lid) has been proposed. A rice cooker with such a structure is easy to use because it does not require the work of attaching and detaching the inner lid, and it does not require cleaning of the inner lid.However, the effect of suppressing spillage by the inner lid is lost, so spills from the steam outlet during rice cooking. Is likely to occur. For this reason, in a structure without an inner lid, it is necessary to reduce the amount of heating at the beginning of boiling and at the time of continued boiling, and there is a problem that uneven cooking due to insufficient heating is greater than that with an inner lid. Further, when the rice cake (water in which starch is melted) generated during rice cooking has an inner lid, the amount of air blown out above the inner lid is suppressed by the small holes formed in the inner lid. However, in a structure without an inner lid, since it occurs directly in the space below the lower surface of the lid, steam or a stick will easily enter the opening of the lid packing that seals the pot and lid provided around the lower surface of the lid, When the lid is opened, a large amount of the soup accumulated in the lid packing flows down along the lower surface of the lid, which makes it easy to stain the upper portion of the container body. In addition, the outer surface of the pot upper part communicates with the outside air through the gap between the lid and the main body of the pot, but if there is an inner lid, the inner lid heated by the lid heater is placed on the pot upper part and heat is transferred to the pot upper part. Although the cooling of the top of the pot due to the outside air is prevented by heating the top of the pan, if there is no inner lid, the lid heater will heat the outer periphery of the bottom of the lid and There is a gap between the pans, the heating effect of the lid heater is low, the upper part of the side surface of the pan is liable to condense on the inside due to cooling from the outside air, and the dewed soup is transmitted along the inside of the pan and the rice is covered with water. There is a problem that the upper part of the pan gets dirty and becomes dirty when the lid is opened.

Further, assembling of the steam inlet provided in the steam inlet is generally done by mounting the steam inlet from the inside of the lid to the steam inlet on the lower surface of the lid. Therefore, the lower end of the steam inlet is covered by the lid. It is attached so as to protrude downward from the lower surface of the body, and the steam port is attached while holding the protruding portion with a hand or fingers. However, the protruding part has a steam intrusion hole that communicates with the outside air outside the lid, and since this steam intrusion hole is located near the rice side by the protruding part, the steam from the rice is cooled by the outside air and There is a drawback that dew condensation occurs at the steam penetration hole and the soup drops on the top surface of the rice from the steam penetration hole.

In view of the above problems, the present invention reduces the dew condensation on the lower surface of the lid body while reducing the dew condensation on the lower inner surface of the pan while keeping the advantage of eliminating the inner lid. It is an object of the present invention to provide a rice cooker without an inner lid, in which the performance of heat insulation is not deteriorated and the main body of the rice cooker is kept clean.

[0005]

In order to achieve the above object, the rice cooker according to the invention of claim 1 has a central portion of a pot facing surface of a lower face member which forms a lower face of a lid body which covers an upper opening of the pot. To
By forming it higher than the outer side of the pan facing surface and providing the steam intrusion hole in the central portion of the lower surface member, the steam intrusion hole can be located at a position where the spilling of the stick is not maximized during rice cooking.

In the rice cooker according to the second aspect of the present invention, the rice cooker is positioned inside the upper edge of the pan from the center of the pan facing surface of the lower surface member forming the lower surface of the lid that covers the upper opening of the pan. By forming the outer portion of the pan facing surface to be low and forming the outer portion to be lower than the upper edge, it is possible to prevent the bean bar from entering the upper edge side during rice cooking.

Further, in the rice cooker of the invention of claim 3, the central portion of the pan facing surface of the lower surface member forming the lower surface of the lid for covering the upper opening portion of the pan is positioned close to the upper edge of the pan. It is formed to be higher than the outer portion of the pot facing surface, a steam penetration hole is provided in the central portion of the lower surface member, and a lid heating device is provided near the outer surface portion and the steam penetration hole of the inner surface of the lower surface member. As a result, it is possible to suppress the occurrence of dew condensation by warming the upper edge side and the steam intrusion hole that are easily cooled by the outside air.

Further, the rice cooker according to the invention of claim 4 is a pan,
A lid that covers the upper opening of the pot, a steam penetration hole provided in a lower surface member of the lid, and a removable steam port that is mounted from the outside of the lid so as to cover the steam penetration hole. By providing a bottom part of the steam port that can move up and down so as to block the steam penetration hole, the steam penetration hole provided in the lower surface member of the lid body is blocked by the bottom part of the steam port during heat retention. Since the steam comes off, the steam generated from the rice does not enter the steam inlet through the steam penetration hole, and the soup is less likely to accumulate inside the steam inlet.

Further, the rice cooker according to the invention of claim 5 covers a pan, a main body for accommodating the pan, a pan heating device provided excluding the central part of the pan, and an upper opening of the pan. By providing a lid and a steam penetration hole provided in the lower surface member of the lid facing the central portion of the pot, the steam penetration hole is provided corresponding to the position where the rice is not spilled to the maximum when cooking rice. Can be located.

A rice cooker according to a sixth aspect of the invention comprises a pot and
A vessel body that accommodates this pot, a pot heating device that is provided in this vessel body, and a pot temperature sensor that is provided in the vessel body,
By providing a lid that covers the upper opening of the pot and a steam penetration hole that is provided in the lower surface member of the lid facing the pot temperature sensor, the pot temperature sensor maximizes the need to cook rice. It is possible to position the vapor penetration hole corresponding to the position where it does not spill.

[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. Reference numeral 1 denotes a container body, which is a cylindrical inner frame 2 having a bottom with an open top surface, an outer frame 3 having the inner frame 2 inside to form an outer shell of the container body 1, and a bottom of the outer frame 3. The bottom plate 4 covers the side. 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.
On the upper edge 5A, which is the uppermost portion of the outer side surface of the pot 5, a flange-shaped handle portion 6 horizontally protruding outward is formed. Pot 5
Is supported in a suspended state by placing the handle portion 6 on the upper end surface of the outer frame 3, and between the inner frame 2 and the pot 5 accommodated therein, 1 to 4 mm except for the handle portion 6. A predetermined gap 7 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.

Further, the overall shape of the pot 5 will be described in detail. Pot 5
The outer surface of the curve is connected to the lowermost portion 11 of the outer bottom surface of the pot 5 with a decreasing rate of the diameter increasing as the height decreases from a height h approximately at the middle of the total height H or about 1/3 of the total height H. When the pot 5 is placed on a flat table surface or the like, the lowermost portion 11 of the pot 5 comes into contact with 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 pan 5 has a diameter A2 of 25% to 75% (1/1) of the diameter A1 of the upper opening 13 of the pan 5.
4 to 3/4). The inner surface of the pan 5 has a vertical cross-sectional shape substantially along the outer surface of the pan 5, and faces the lowermost portion 11 from a side position approximately at the middle of the total height H or about １ ／ of the total height H. It is formed in the shape of a curved surface over the bottom surface to be formed. In addition, the side surface here refers to a portion from the upper surface opening 13 including the handle portion 6 to the outermost peripheral portion of the lowermost portion 11 (a portion located at the outermost peripheral portion 12) that contacts the table surface, etc. The curved surface portion 14 having the above-mentioned curved inner surface is formed from the bottom to the bottom surface. 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. In the figure, Z indicates the axis of the center of the pan 5 and the lid described later.

Reference numeral 21 is a heating coil provided outside the inner frame 2 and corresponding to a pan heating device for heating the heat generating 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. The heating coil 21 may be provided in a portion other than this portion. However, the heating coil 21 is placed at a position facing the curved surface portion 14 of the pot 5 at least so that heat convection of water in the pot 5 is easily generated at the time of cooking rice. Preferably, 21 is provided. An outer side of the heating coil 21 is provided with an insulative coil cover 22 in which a high-permeability material powder mainly composed of iron oxide or the like is mixed with a plastic material, and a cylindrical portion 22A is provided outside the center of the coil cover 22. Is projected upward and the inner end 21A of the heating coil 21 is fixed to the outside of the cylindrical portion 22A to prevent leakage of magnetic flux and efficiently heat the heating layer 9 by electromagnetic induction.
By forming the coil cover 22 with the insulating plastic mixed with the high-permeability material powder in this way, both the fixing of the heating coil 21 and the leakage prevention of the magnetic flux are performed by one functional component, and the structure is simplified. It is composed. Reference numeral 23 is a pan temperature sensor provided near the heat generating layer 9 of the pan 5 and having a negative characteristic thermistor inside.
Is provided in the central portion so as to pass through the tubular portion 2A provided in the inner frame 2 and inserted into the tubular portion 22A. Reference numeral 24 is a temperature fuse located near the heat generating layer 9 and the heating coil 21 and provided on the outer surface of the inner frame 2 to detect abnormal heating and cut off the electric power. Tube part 2A
It is provided between and.

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 plate 4 at the bottom of the container body 1 and the support 28 together with the cooling fan 30 provided with the motor 29 by the support 28 provided inside the container body 1. An intake port 31 is provided at the bottom of the bottom plate 4 facing the cooling fan 30, and an exhaust port 32 is provided at a side surface of the bottom plate 4 facing one side of the heating substrate 26. Support 28
Is provided upright on one side of the heating substrate 26. Between the support 28 and the front surface of the main body 1, an LCD 33 and an LED forming an operation panel 33 as display operation means are provided.
A display operation component 36 having 34 and various switches 35;
A power supply circuit component 37 other than the inverter circuit component 27 is
It is provided in a state of being mounted on. 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. 39 is a power cord 40 provided on the lower rear side of the outer frame 3.
Is a code reel that winds up.

Reference numeral 41 is a lid that covers the upper opening 13 of the pot 5 so as to be openable and closable. The lid body 41 is attached to the outer lid 42, an outer lid cover 43 provided along the outer periphery of the lower side of the outer lid 42, and a space below the outer lid 42 to form a space. As a member, a lid lower surface plate 44 which is a lower surface member made of an aluminum material and which directly covers the upper opening 13 of the pot 5 is constituted. The outer lid 42 is formed of a plastic such as polypropylene by injection molding to have a three-dimensional appearance that is excellent in design and can be freely colored to improve the degree of freedom in design. The recess for mounting the mouth can be easily formed. Reference numeral 45 is a lid packing sandwiched between the outer lid cover 43 and the lid lower surface plate 44. The bottom of this lid packing 45 is
When the lid 41 is opened, the inside of the lid 41 is V-shaped so that the inside is opened. On the other hand, when the lid 41 is closed, the lower end of the lid packing 45 bends and comes into close contact with the upper edge 5A of the pot 5. 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 46A is provided. Although not shown, the hinge shaft 46 has a lid body inside.
An elastic member such as a torsion coil spring for urging the opening 41 at all times is provided. By pressing the clamp button 46A, the lid 41 can be opened with the hinge shaft 46 as the center of rotation. ing.

A concave portion 47 and a convex portion 47A are provided on a pot facing surface 44A of the lid lower surface plate 44 facing the pot 5 to improve strength by work hardening. If the depth of the concave portion 47 is large, the effect of improving the strength is high, but the surface may be difficult to wipe off. Therefore, it is preferable that the depth B is formed within about 1 mm. The shapes of the concave portion 47 and the convex portion 47A are not particularly limited, and are formed in consideration of design properties such as a circle, an ellipse, a triangle, and a turtle pattern. On the other hand, the inner surface 44B of the lid lower surface plate 44 facing the inner side of the lid 41 is flat or has a convex shape with a low protruding height that is small enough to allow a lid heater to be bonded as described later. The inner surface 44B may also be provided with irregularities. Further, an outer portion 44C located inside the upper edge 5A of the lid lower surface plate 44
The thickness C1 of 3 to 6 mm, and
The thickness C2 of the central portion 44D is formed to be about 1.5 to 3 mm, which is thinner than the thickness C1 of the material, and the central portion 44D of the lid lower surface plate 44 is formed to be higher than the outer portion 44C. Further, the lower end of the outer portion 44C, which is close to the inside of the upper edge 5A with a maximum gap of about 3 mm, is formed lower than the upper edge 5A.

Next, a method of manufacturing the lid lower surface plate 44 will be described. The first manufacturing method is based on a melt forging method. In this melt forging method, aluminum heated in a molten state is poured into a lower mold, tightened by an upper mold, pressurized and solidified from above, molded and formed, and a recess 47 and the like are formed by a mold composed of a lower mold and an upper mold. A lid lower plate 44 having a predetermined shape is formed. The second manufacturing method is based on an aluminum die casting method. In this aluminum die casting method, a molten aluminum is poured into an upper and lower mold, solidified and formed, and a lower surface plate 44 having a predetermined shape in which a concave portion 47 and the like are formed by a metal mold is formed. According to such a melt forging manufacturing method and an aluminum die casting manufacturing method, the thickness C1 of the material on the outer peripheral side of the lid lower surface plate 44 is formed thicker to about 3 to 6 mm, and the thickness C2 of the central portion is made larger than the thickness C1 of the material. It can be formed to a thin thickness of about 1.5 to 3 mm, and can be formed into a plate shape in which the pot facing surface 44A and the inner surface 44B are non-similar and the thickness of the material is uneven. Further, a third manufacturing method is a press molding manufacturing method. Although not shown in the drawing, this press-molding method is one in which an aluminum plate having a material thickness of about 1 to 3 mm is stamped and formed into a concave portion, and then press-molded into a predetermined shape. The concave marking is formed only on the surface corresponding to the facing surface.

On the inner surface 44B of the lid lower surface plate 44, the lid lower surface plate 44
Cord heaters 48 and 48A as lid heating devices that are lid heaters for heating are provided in the vicinity of the outer portion 44C and the vapor penetration hole described later, respectively. This code heater 48, 48A
Is a side heater 49 such as a cord heater that keeps the inner frame 2 warm.
Is electrically connected by a parallel circuit. The cord heater 48 and the side heater 49 are connected by a series circuit to a switching control element such as a triac which is a control means of a lid heating device (not shown). Further, a lid temperature sensor 50 composed of a negative characteristic thermistor for detecting the temperature of the lower surface of the lid 41 is provided on the inner surface 44B side of the lid lower surface plate 44, and a predetermined value is set according to the temperature detected by the lid temperature sensor 50. The temperature of the lid lower surface plate 44 is controlled according to the temperature. The upper surface of each of the code heater 48 and the lid temperature sensor 50 is covered with an aluminum foil 51. Along with the outer lid cover 43 and the lid lower surface plate 44, a predetermined space is formed on the upper surface of the aluminum foil 51. The heat insulating plate 52 is attached and fixed. 53 is a sensor retainer for holding the lid temperature sensor 50 on the upper surface of the lid lower surface plate 44. The cord heater 48 and the side heater 49 may be heated by controlling the predetermined energizing time to heat the lid lower surface plate 44 during rice cooking and heat retention.

Reference numeral 61 indicates the lower surface plate 44 of the lid and the center of the pan 5 (on the axis Z), that is, the inside of the cylindrical portion 22A to which the inner end 21A of the heating coil 21 is fixed, and the pan temperature sensor 23.
The steam entrance holes are provided so as to face each other, and the steam enters the steam port 62 from the steam entrance holes 61. To describe the configuration around the steam port 62 in detail, a recess 63 for mounting the steam port 62 is provided on the upper surface of the outer lid 42, and the steam port 62 is an upper surface exposed to the outside of the lid body 41. A steam port cover 65 having a steam discharge port 64 formed therein and a bottomed cylindrical bucket 66 that is vertically movable with a stroke of 1 to 3 mm are assembled inside the steam port cover 65. The bucket 66 is made of a metal material such as aluminum or stainless steel, or a plastic material such as polypropylene, and has a steam port formed below it.
A bulging portion 67 corresponding to the bottom surface portion of 62 is provided so as to protrude from the lower surface opening portion 68 of the steam port cover 65. On the outer upper part of the steam port cover 65, a projection 70 is formed to be locked to the locked piece 69 of the outer lid 42. The engagement and disengagement of the locked piece 69 and the projection 70 The steam port 62 can be further attached and detached.

Reference numeral 71 is a steam port packing that seals between the lower end of the recess 63 and the lid lower surface plate 44. This steam port packing 71
Is for preventing the invasion of steam into the lid 41, and when the steam port 62 is mounted in the recess 63, the steam port cover 65
The bent part 72 formed at the lower part of the outer periphery of the
A configuration in which the bottom surface of the bulging portion 67 of the bucket 66 is placed on the upper surface of the lid lower plate 44 exposed to the inner bottom surface of the concave portion 63 and closes the vapor intrusion hole 61 of the lid lower plate 44 while being in close contact with the inner end of the bucket 71. It has become. In addition, the bucket 66
A partition plate 74 having a plurality of communication holes 73 communicating the inside and the outside of the device is provided. At the center of the bulging portion 67 of the bucket 66, there is provided a return hole 75 through which the lumps collected inside the bucket 66 during rice cooking flow. The return hole 75 is a check valve made of an elastic member such as silicone rubber. It is in a state of being closed by the tongue piece 77 of 76. 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 pressure of the steam pushes the bucket 66 upward from the lid lower surface plate 44 and passes through a steam passage hole 78 formed between the outer surface of the bucket 66 and the inner surface of the steam port cover 65 to pass through the steam port cover. The steam is discharged to the outside of the lid 41 from the steam discharge port 64 on the upper surface of the cap 65. Thereafter, when the rice cooking is completed, the heating is stopped, and the process shifts to spots, the inside of the pot 5 becomes negative pressure, so that the check valve 76 moves toward the pot 5 and forms a lower portion of the check valve 76. From between the tongue piece 77 and the return hole 74, the bucket 66
The tonnage that has accumulated inside the container returns to the pot 5 side.

Further, when the temperature is kept warm, the pressure of the steam in the pan 5 is lowered, so that the bucket 66 is attached to the bottom plate of the lid by its own weight.
It is placed on the upper surface of 44 and closes the vapor entry hole 61 of the lid lower plate 44. The cord heater 48A is arranged so as to surround the steam inlet 62 in the vicinity of the steam entrance hole 61, that is, within a range of about 30 mm around the steam inlet packing 71, and is covered by the code heater 48A during heat retention. When the lower surface plate 44 is heated, the vapor penetration hole 61 in the vicinity thereof is heated, and the bucket 66 in contact with the lid lower surface plate 44 is heated by heat conduction. The steam pressure for pushing up the bucket 66 can be changed by changing the material or size of the bucket 66, whereby the internal pressure during rice cooking can be adjusted. In addition, the check valve 76 is not made of an elastic member such as silicone rubber, but when the rice is cooked, the return hole 75 is closed to suppress the steam in the bucket 66, the rice cooking is completed, and the steam pressure inside the pan 5 is reduced. A metal material such as aluminum or stainless steel may be used as long as the return hole 75 is opened at this time.

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, the jar type rice cooker of the present embodiment has a structure in which the upper opening 13 of the pan 5 is covered by the lid lower surface plate 44 of the lid body 41, not by the inner lid. It is easy to put on and take off, and the inner lid does not need to be cleaned, so it is practically easy to use. Further, the central portion 44D of the lid lower surface plate 44
Is formed higher than the outer portion 44C, and the steam penetration hole 61 is provided in the central portion of the lid lower surface plate 44, so that the steam can be released farthest from the top surface of the rice during cooking.
Further, the steam penetration hole 61 is located farthest from the upper part on the inner side of the pan 5 where the boiling is strongest due to the heating of the side surface of the pan 5. Therefore, the steam penetration hole 61 is located at a position where the spill does not spill out to the maximum when cooking rice, and the spillage can be reduced. As a result, it is not necessary to excessively reduce the amount of heating by the heating coil 21 at the beginning of boiling and at the time of continuing boiling, and uneven cooking due to insufficient heating can be suppressed.

Further, the central portion of the pot facing surface 44A of the lower surface member 44
The outer part 44C of the pan facing surface 44A located closer to the inside of the upper edge 5A of the pan 5 than the 44D is formed lower, and the outer part 44C is formed lower than the upper edge 5A, so When the lid 41 is closed, the lower portion of the lid packing 45 is bent and comes into close contact with the upper edge 5A, and the lower surface of the outer portion 44C is located below the lid packing 45. Therefore, when cooking rice, the amount of steam or stick to the lower portion of the lid packing 45 is suppressed to a small amount, and the amount of soup accumulated in the lower portion of the lid packing 45 can be reduced. Therefore, it is possible to prevent the upper portion of the soup saucer body 1 from becoming dirty when the soup sauce flows and the lid 41 is opened. When the lid 41 is opened, the lower part of the lid packing 45 opens elastically, so that the soup that has flowed down along the lid lower surface plate 44 can be collected, and the soup saucer body 1
It can prevent the upper part of the from getting dirty.

The outer portion 44C of the pot facing surface 44A is located close to the upper edge 5A of the pot 5, and the outer portion 44B of the inner surface 44B of the lower surface member 44 is provided.
By providing the code heater 48 near C, the upper edge 5
It is possible to reduce the gap between A and the outer portion 44C and to suppress the cooling due to the outside air from this gap by the cord heater 48.
Further, by providing the code heater 48A in the vicinity of the steam penetration hole 61 as well, the code heater 48A can suppress the cooling of the steam penetration hole 61, and hence the steam port 62, by the outside air. Therefore, the inner edge of the pan 5 and the steam port 62 are prevented by preventing the upper edge 5A and the steam port 62 of the lid body 41 that are most likely to be cooled during heat retention from cooling.
As a result, without deteriorating the performance of rice cooking and heat retention, the boiled rice becomes sticky due to excessive water content, and the upper part of the main body 1 is boiled when the lid 41 is opened. That can be prevented.

Further, a detachable steam port 62 is provided from the outside of the lid 41 so as to cover the steam penetration hole 61, and a bulging portion 67 is provided so as to be vertically movable so as to close the steam penetration hole 61. As a result, the steam generated from the rice will be discharged from the steam penetration hole 61
The dew does not easily collect inside the steam port 62 because it does not enter the 62. Therefore, when the lid 41 is opened, the dew does not flow down from the inside of the steam port 62 along the lid lower surface plate 44, and the upper part of the vessel body 1 is soiled or the dew while keeping the temperature is warm. Problems such as the rice sticking on the inside of the rice are improved. Further, the assembly of the steam port 62 in the present embodiment is configured such that the steam inlet hole 61 of the lid lower surface plate 44 is mounted from the outside of the lid body 41, so that the lower end portion of the steam port 62 is covered by the lid. It does not project from the lower surface plate 44 and does not come close to the upper surface of the rice in the pan 5, and it is possible to wipe off the dew condensation of the steam of the rice on the projecting portion.

The heating coil 21 has its inner end 21A fixed to the cylindrical portion 22A except the central portion of the pot 5, and the steam penetration hole 61 is opposed to the central portion of the cylindrical portion 22A. By providing, the vapor penetration hole 61 is located at a position distant from the heat of the heating coil 21, and therefore,
The steam intrusion hole 61 is located at a position where the spillage does not spill to the maximum when cooking rice, and the spillage can be reduced. As a result,
It is not necessary to excessively reduce the amount of heating by the heating coil 21 at the beginning of boiling and during boiling, and it is possible to suppress uneven cooking due to insufficient heating.

Further, by providing the steam penetration hole 61 in the lower surface member 44 of the lid 41 so as to face the pan temperature sensor 23 located in the central portion provided in the main body 1, the heating coil 21 is heated by the pan temperature sensor 23. Steam penetration hole facing the position not provided
By providing 61, the vapor penetration hole 61 is located at a position distant from the heat of the heating coil 21, and therefore,
The steam intrusion hole 61 is located at a position where the spillage does not spill to the maximum when cooking rice, and the spillage can be reduced. As a result,
It is not necessary to excessively reduce the amount of heating by the heating coil 21 at the beginning of boiling and during boiling, and it is possible to suppress uneven cooking due to insufficient heating.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, although the electromagnetic induction heating type rice cooker is shown in the embodiment, other heating type rice cookers in which a pan is heated by a sheath heater or the like may be used.

[0031]

According to the rice cooker of the present invention, the central portion of the pan facing surface of the lower surface member forming the lower surface of the lid that covers the upper opening of the pan is formed higher than the outer portion of the pan facing surface. However, by providing a steam penetration hole in the central portion of the lower surface member, while taking advantage of the elimination of the inner lid, it is possible to reduce the reduction effect of the spillage due to the absence of the inner lid, and the heating amount to the initial boiling point. It is not necessary to excessively reduce the amount when boiling continues, and it is possible to prevent uneven cooking due to insufficient heating.

In the rice cooker according to the invention of claim 2, the pot is located inside the upper edge of the pot from the center of the pot facing surface of the lower surface member forming the lower surface of the lid that covers the upper opening of the pot. By forming the outer part of the facing surface low and making this outer part lower than the upper edge, steam and sticks generated during rice cooking can invade the upper edge while taking advantage of the loss of the inner lid. It is difficult to do so, and it is possible to prevent the problem that when the lid is opened, it flows down along the facing surface of the pan and the upper part of the main body of the container is easily soiled.

In the rice cooker of the third aspect of the present invention, the central portion of the pan facing surface of the lower surface member forming the lower surface of the lid that covers the upper opening of the pan is positioned close to the upper edge of the pan. It is formed higher than the outer portion of the pan facing surface, a steam penetration hole is provided in the central portion of the lower surface member, and a lid heating device is provided near the outer portion and the steam penetration hole of the inner surface of the lower surface member, respectively. This makes it possible to narrow the gap between the upper edge and the lower surface member while preventing the cooling due to the outside air by the lid heating device while taking advantage of the advantage of eliminating the inner lid. It can be prevented. For this reason, it is difficult for dew to condense on the inner surface of the pan, and the condensed soup does not flow along the inner surface of the pan and flow into the rice, and the rice does not become sticky due to excessive water content, or when the lid is opened, the bowl itself does not become dirty. . Therefore, the spillage is suppressed to reduce the condensation on the lower surface member, and the condensation on the inner surface of the inner side of the pan is reduced during heat retention, without deteriorating the performance of rice cooking and heat retention, and further, there is no inner lid to keep the main body clean Can provide a rice cooker.

The rice cooker according to the invention of claim 4 is a pot, a lid for covering the upper opening of the pot, a steam penetration hole provided in a lower surface member of the lid, and the outside of the lid. A removable steam port that is mounted so as to cover the steam penetration hole is provided, and the vertically movable bottom part of the steam port is provided so as to close the steam penetration hole. It is possible to prevent dew condensation on the bottom plate of the lid by eliminating the protrusion of the steam port to the upper surface of the rice and closing the steam penetration hole with the bottom surface of the steam port while keeping the temperature warm.

The rice cooker according to the invention of claim 5 is a pan, a main body for accommodating the pan, a pan heating device provided excluding the central portion of the pan, and a lid for covering the upper opening of the pan. And a steam penetration hole provided in the lower surface member of the lid facing the center of the pot, the advantage of eliminating the inner lid can be obtained, but the rice can not be blown to the maximum when cooking rice. The steam penetration hole is located at the position, and blowout can be reduced. As a result, it is not necessary to excessively reduce the amount of heating by the pan heating device at the beginning of boiling and at the time of continuing boiling, and uneven cooking can be suppressed due to insufficient heating.

A rice cooker according to a sixth aspect of the present invention is a pot, a pot body for accommodating the pot, a pot heating device provided in the pot body, a pot temperature sensor provided in the pot body, and a pot for the pot. A lid that covers the upper opening and a steam penetration hole that is provided in the lower surface member of the lid facing the pot temperature sensor are provided. Therefore, while utilizing the advantage of eliminating the inner lid, when cooking rice. The steam penetration hole is located in a position where the spill does not spill as much as possible, and spillage can be reduced. As a result, it is not necessary to excessively reduce the amount of heating by the pan heating device at the beginning of boiling and at the time of continuing boiling, and uneven cooking can be suppressed due to insufficient heating.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view when the lid body is opened.

[Explanation of symbols]

 5 Pan 5A Upper edge 21 Heating coil (pot heating device) 23 Pot temperature sensor 41 Lid 44 Lower lid plate (lower lid) 44A Pot facing surface 44B Inner surface 44C Outer portion 44D Center 48 48A Cord heater (lid heating device) ) 61 Steam entry hole 62 Steam port 66 Bucket (bucket member) 67 Bulging part (bottom part) 76 Steam vent passage

Claims (6)

[Claims] 1. A central portion of a pan-facing surface of a lower surface member forming a lower surface of a lid that covers an upper opening of the pan is formed higher than an outer portion of the pan-facing surface, and steam is provided in a central portion of the lower surface member. Rice cooker characterized by having an entry hole. 2. The outer portion of the pot facing surface located inside the upper edge of the pot is formed lower than the center of the pot facing surface of the lower surface member that forms the lower surface of the lid that covers the upper opening of the pot. In addition, the rice cooker is characterized in that the outer portion is formed lower than the upper edge. 3. The center of the pot facing surface of the lower surface member forming the lower surface of the lid that covers the upper opening of the pot is higher than the outer portion of the pot facing surface located near the upper edge of the pot. Formed,
A rice cooker characterized in that a steam penetration hole is provided in a central portion of the lower surface member, and a lid heating device is provided in the inner surface of the lower surface member and in the vicinity of the steam penetration hole. 4. A pot, a lid that covers an upper opening of the pot, a steam penetration hole provided in a lower surface member of the lid, and a state in which the steam penetration hole is provided from the outside of the lid. And a detachable steam port, and a bottom part of the steam port that can move up and down is provided so as to close the steam penetration hole. 5. A pot, a main body for accommodating the pot, a pot heating device provided excluding the central portion of the pot, a lid for covering an upper opening of the pot, and a central portion of the pot. A rice cooker comprising a steam penetration hole provided in a lower surface member of the lid body so as to face each other. 6. A pot, a main body for accommodating the pan, a pan heating device provided in the main body, a pan temperature sensor provided in the main body, and a lid for covering an upper opening of the pan. And a steam penetration hole provided in a lower surface member of the lid body so as to face the pot temperature sensor.