JP3343899B2 - rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker such as a rice cooker for a jar.

[0002]

2. Description of the Related Art In a conventional rice cooker combined with a jar, an inner lid for closing an upper opening of a pot is detachably provided at a lower side of a lid, but a cooker without the inner lid may be used. Has become. Such a rice cooker without an inner lid has the advantage that there is no trouble in attaching and detaching the inner lid, there is no need to clean the inner lid, and the usability is good. On the other hand, it is necessary to wipe the underside of the lid that is dirty due to the adhesion of rice cake (hot water or water in which starch is melted) when cooking rice. If the lid is deformed or squeezed, it will be difficult to wipe it off. It is necessary to secure sufficient lid strength.

[0003] Conventionally, a rice cooking method has been adopted in which the lower surface of the lid is heated during rice cooking and the upper surface of the rice is heated by radiant heat from the lower surface of the lid. It is known that the moisture on the upper surface of the rice cake is reduced and the cooked state is improved.

[0004] In view of the above, the material of the lower surface of the lid forming the lower surface of the lid is changed from a conventional aluminum material to a stainless steel material to improve the strength of the lid and to heat the inside of the lid. There is a rice cooker in which a coil is provided and an upper surface of rice is heated by inductively heating a lower surface member made of a magnetic material. However, in this conventional rice cooker, since the heat conductivity of the material of the lid lower surface member is lower than that of aluminum, only the portion facing the heating coil becomes high temperature, and the other portions do not become so high in temperature. There was a problem of unevenness.

[0005] In addition, the part of the component forming the lower surface of the lid that tends to lower the temperature (the temperature is not easily increased by heating the lid) is
A steam port portion and a lid packing portion. The steam port has a portion that communicates with the outside air, so that the temperature tends to decrease. Particularly, in the case of a detachable steam port, heat conduction from the lower surface of the lid is alienated, so that the temperature is further reduced. The lid packing is provided on the outer periphery of the lower surface of the lid, and seals the lower surface of the lid and the pan in a sealed state. However, since the material is made of silicone rubber or the like, heat conductivity is low. Poorly, there is not much heat transfer from the lower surface of the lid, and there is a portion that communicates with the outside air due to the gap between the lid and the rice cooker main body, so that the temperature is easily lowered. As described above, it is desirable to provide a heating source at a portion where the temperature is not easily increased by heating the lid. However, the heating coil has little flexibility, and it is difficult to arrange the heating coil near the steam port or the lid packing. This is the cause of the uneven heating.

Further, the weight of the entire lid is too heavy due to the heating coil. Therefore, if the elastic force of a hinge spring formed of a coil spring or the like that applies a force in the opening direction to the lid at the hinge portion supporting the lid is not increased,
The lid does not open automatically. In addition, when the lid is opened, the impact force applied to the hinge part becomes stronger, so when the pot is not in the rice cooker body and the weight of the rice cooker body side is light, the rice cooker body moves backward. Jumps up. As a remedy for this, a damper mechanism or the like for suppressing the force for opening the lid during the opening operation of the lid must be provided in the hinge portion, but this reduces the manufacturability and increases the cost.

[0007] Even when a heating is performed by providing a code heater on the back surface of the lid lower surface member instead of the heating coil, the conventional rice cooker is liable to lower the temperature near the steam port and the lid packing. This is because, in the conventional rice cooker, as shown in FIGS. 7 and 8, the steam port 121 provided on the lid is
This is because a sufficient space for disposing the lid heater 123 composed of a cord heater is not secured between the steam port 121 and the outer periphery of the lid lower surface member 122 in this portion. . That is, as shown in FIG. 8, since the relationship between the dimension L on one side and the dimension L1 on the other side of the steam port 121 is L> L1, as shown in FIG. The lid heater 123 is harder to arrange than the portion having the dimension L. In some cases, the lid heater 123 cannot be arranged between the steam port 121 and the outer periphery of the lid lower surface member 122 as shown in FIG. Therefore, at the lid packing portion of the lid lower surface member 122 near the vapor port 121, heating by the lid heater 123 tends to be insufficient.

[0008]

As described above, in the conventional rice cooker without the inner lid, the lower surface member of the lid is heated by the electromagnetic induction heating by the heating coil, or the lower surface member of the lid is located at an uneven position. Since the steam port is provided, there is a problem that uneven heating of the lower surface member of the lid occurs.

The present invention is intended to solve such a problem. In a rice cooker in which an inner lid is removed, unevenness in heating of a lower surface member of the lid and sufficient strength are ensured.
Then , the purpose is to improve the cleanability.

[0010]

In order to achieve the above object, a rice cooker according to the present invention has a rice cooker main body containing a pot, and a lid provided on the upper side of the rice cooker body so as to be freely opened and closed. A body and a steam port provided in the lid and discharging steam to the outside during cooking rice, a stainless steel material is used as a material of a lid lower surface member that forms a lower surface of the lid and closes an upper opening of the pan. The steam port is provided at a position facing the center of the upper opening of the pot in the lid lower surface member, and a heating means for heating the lid lower surface member is provided on the back surface of the lid lower surface member, and the heating port is provided around the steam port. , And are arranged almost evenly, and the lower surface of the lid
A plurality of uneven portions are formed on the surface of the material .

[0011] Thus, the lid lower surface member is uniformly heated by the heating means, so that uneven cooking during rice cooking is prevented and dew condensation is prevented at each part of the lid lower surface member. In addition, the lid lower surface member made of stainless steel has high strength,
When the dirt on the lower surface member of the lid is wiped off, it is not easily deformed.
In addition, multiple irregularities are formed on the surface of the lid lower surface member
The strength of the lid lower surface member is further improved by work hardening.
Up.

According to a second aspect of the present invention, in the rice cooker according to the first aspect of the present invention, the heating means comprises a cord-shaped heater, and the heater is connected to the vicinity of the steam port and an outer peripheral portion of the lid lower surface member. The lid lower surface member and the vicinity of a lid packing for sealing the pan are provided.

The cord-shaped heater does not make the lid heavy. Further, the heater provided near the steam port and the lid packing prevents a temperature drop near the steam port and the lid packing, which is originally liable to be cooled due to invasion of outside air.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. The rice cooker according to the present embodiment is a rice cooker that also serves as a jar. In FIG. 1, reference numeral 1 denotes a rice cooker main body, which is a bottomed cylindrical inner frame 2 having an open upper surface, and an outer frame 3 having the inner frame 2 therein and forming an outer shell of the rice cooker main body 1. And a bottom plate 4 that covers the bottom side of the outer frame 3. An annular rib-shaped pot supporting portion 5 is formed at the upper end of the inner frame 2 forming the pot accommodating portion. On the other hand, a notch 6 is formed at the upper end of the outer frame 3 at the outer periphery of the pot supporting portion 5. This notch 6
Has an inclined surface 6a that descends outward from the pot supporting portion 5. The inner frame 2 is made of FR-PET resin, and is formed in a shape substantially similar to the outer shape of the pot 11 removably accommodated in the inner frame 2.

The pot in which rice or water to be cooked is stored
11 is formed in a bottomed cylindrical shape with an open upper surface, and at the upper end of the outer surface of the pot 11, a flange portion 12 that projects horizontally outward is formed.
A pan handle 13 is provided so as to cover the same. In addition, hot pot 11
Is formed by a pot body 14 mainly made of an aluminum material, and a heat generating layer 15 made of a magnetic metal material provided on a curved portion from a lower side surface to a bottom surface of the pot body 14.

Reference numeral 21 denotes a heating coil provided outside the inner frame 2 and serving as heating means for causing the heating layer 15 of the pot 11 to generate heat by electromagnetic induction. The heating coil 21 is wound around and fixed to the outer surface of the inner frame 2 so as to face the heating layer 15 of the pan 11. Outside the heating coil 21, there is provided a coil cover 22 in which a high magnetic permeability material powder mainly composed of iron oxide or the like is mixed with a plastic material. Thus, the heating coil 21 is fixed to the inner frame 2, and the heat generation layer 15 is efficiently heated by induction by preventing leakage of magnetic flux. 23 has a negative thermistor inside,
A pan temperature sensor 24 detects the temperature at the bottom of the inner frame 2. Numeral 24 is a thermal fuse located near the heat generating layer 15 and the heating coil 21 and provided on the outer surface of the inner frame 2. Further, reference numeral 25 denotes a side heater which is a heating means for keeping heat provided on the upper portion of the outer surface of the inner frame 2.

Reference numeral 26 denotes a heating board provided with an inverter circuit component 27 for supplying a predetermined high-frequency current to the heating coil 21 and the like. Then, from the inverter circuit, the heating coil 21
When a high-frequency current is supplied to the heating coil 21, an alternating magnetic field is generated in the heating coil 21, an eddy current is generated in the heating layer 15 of the pot 11 in the magnetic field, and the eddy current is converted into Joule heat. The heating layer 15 generates heat, and the pot 11 is heated. The heating board 26 is supported by a support 28 provided inside the rice cooker main body 1 and a cooling fan 30 having a motor 29.
At the same time, it is disposed between the bottom plate 4 at the bottom of the rice cooker main body 1 and the support 28. An intake port 31 is provided at the bottom of the bottom plate 4 facing the cooling fan 30, and a heating substrate is provided.
An exhaust port 32 is provided on a side surface of the bottom plate 4 facing one side of 26. 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 rice cooker main body 1, an LCD 34, an LED 35 and an LCD 35 forming an operation panel 33 as a display operation means are provided. A display operation component 37 having various switches 36 and a power supply circuit component 38 are provided in a state mounted on a substrate 39. Reference numeral 40 denotes a code reel that winds the power cord 41 provided on the lower rear side of the outer frame 3.

Reference numeral 51 denotes a lid which covers the upper opening of the pan 11 so that it can be opened and closed. The lid body 51 is attached to the outer lid 52 while forming a space below the outer lid 52, and an outer lid cover 53 provided along the lower outer periphery of the outer lid 52. The lid lower surface plate 54 directly covers the upper opening of the pot 11 as a lid lower surface member forming the lower surface. The lid 51 is supported by a hinge shaft 55 on the upper rear side of the rice cooker main body 1. Although not shown, an elastic member such as a torsion coil spring is provided inside the hinge shaft 55 to apply a force to the cover 51 in a direction to always open. On the other hand, on the upper side of the rice cooker main body 1 or the lid 51 on the side opposite to the hinge shaft 55, the lid 51 is closed with respect to the rice cooker main body 1 against the force exerted by the elastic member. Is provided. Further, the lid body 51 is provided with a steam port 57 for discharging steam generated in the pot 11 during cooking rice to the outside of the rice cooker main body 1. Although the steam port 57 will be described in detail later, the lid lower surface plate 54 has a diameter that forms a portion of the steam port 57 on the pot 11 side at a position facing substantially the center of the inner diameter of the upper opening of the pot 11. An opening 58 of about 50 mm is formed. The distance from the opening 58 to the outer periphery of the lid lower plate 54 is substantially the same in all parts.

The lid lower plate 54 is formed with a flange 61 rising upward around the outer surface of the surface facing the pot 11, and the flange 61 is formed on the inner peripheral portion of the annular outer lid cover 53. It is fixed by screws 62. Also, the lid bottom plate
The lower surface of the outer peripheral portion of the surface facing the pan 11 in 54 is an annular convex portion 63. And, the flange portion of the lid lower plate 54
An annular lid packing 64 made of an elastic material such as silicone rubber is sandwiched and fixed between 61 and the outer lid cover 53. The lower portion of the lid packing 64 is formed in an approximately U-shaped or U-shaped cross section by an upper tongue piece 65 and a lower tongue piece 66 to form a bag-shaped space portion 67, The lower surface of the piece 66 contacts the inner surface of the upper opening of the upper surface of the pot 11. Thus, the lid lower plate 54 and the pan 11
It is sealed in a sealed state by the lid packing 64. Note that a stepped recess 68 for receiving the tongue pieces 65 and 66 is formed below the inner peripheral portion of the outer cover 53.

The lid lower plate 54 is made of an austenitic stainless steel material such as SUS304 which does not easily rust. The lid lower plate 54 has an uneven portion 71 on the surface to improve the strength by work hardening. The material thickness t of the lid lower plate 54 is
At the time of manufacturing, the concave portion of the concave-convex portion 71 is stamped and formed by press working, and then press-formed into a predetermined shape. The concave / convex portion 71 has a concave mark formed at least on the surface facing the pot 11 side, and the inside of the lid 51 on the back side corresponding to this concave portion is substantially flat, or comprises a cord heater as a heating means. The protruding shape has a small protruding height that is small enough to allow the lid heater 72 to be bonded. On the other hand, the lid lower plate 54
On the top side (pan 11 side), the deeper the depth of the engraved concave, the higher the effect of strength improvement, but there is a drawback that the surface becomes difficult to wipe, so the depth of the concave is about 1 mm or less. It is preferable to suppress. The planar shape of the concave portion is not particularly limited, and may be selected in consideration of design such as a circle, an ellipse, a triangle, and a turtle pattern. Further, after the lid lower plate 54 is formed into a predetermined shape or before pressing, an oxide film is formed by chromic acid treatment or the like, and black, gray, and blue are subjected to color development processing to make the metallic luster less noticeable. In addition, the appearance is improved by making it difficult for fingerprints to be attached, and the adhesion of the tongue is made inconspicuous.

A lid heater 72 provided on the back surface of the lid lower plate 54 is fixed to the lid lower plate 54 by aluminum foil adhered to the lid lower plate 54 with a double-sided adhesive tape. The lid heater 72 is of the order of 10 to 100 W, the ambient room temperature is 35 ° C., and the applied voltage is 110 V. Temperature 170
It is configured to be below ℃. This is because the material of the outer lid cover 53 for fixing the lid lower plate 54 via the lid packing 64 is excellent in steam resistance in consideration of steam being hit during rice cooking, and the lid packing 64 and the lid lower plate This is for the case of using polypropylene that can be molded freely into a shape that can be easily fixed. That is, polypropylene melts at about 173 ° C, but the lid heater 72
Even when the power supply is continuously energized, the surface temperature of the surface of the lid lower plate 54 on the pot 11 side is only 170 ° C. or less, so that the melting of the outer lid cover 53 can be prevented, and the safety is improved. The lid heater 72 and the side heater 25 are electrically connected in parallel to each other, and are connected to a power cutoff control element such as a bidirectional thyristor by a series circuit. The lid lower plate 54 and the inner frame 2 are each heated during the heat retention. The lid heater 72 is disposed substantially evenly around the opening 58 forming the vapor port 57 in the outer peripheral direction on the lid lower surface plate 54.
58, and the rear side of the convex portion 63 in the lid lower surface plate 54 near the lid packing 64. In addition, the lid 51
Is provided with a lid temperature sensor 73 comprising a negative temperature coefficient thermistor for detecting the temperature of the lid lower plate 54. The lid temperature sensor 73 is pressed against the lid lower plate 54 via a silicone sponge 75 by a sensor holder 74 provided on the outer lid 52.

As described above, the lid heater 72 is connected to the lid lower plate 54.
Are arranged almost uniformly from the steam port 57 in the entire outer peripheral direction. As shown in FIGS. 2 to 6, various arrangements such as a spiral shape, an annular shape, and a square shape are possible. In short, the lid heater 72 only needs to be provided on almost the entire outer periphery of the steam port 57.

Next, the structure of the steam port 57 will be described. On the upper surface of the outer lid 52, a steam port cover 81 is integrally formed at a portion facing the opening 58 of the lid lower plate 54. The steam port cover 81 forms the outer surface of the lid 51 by closing the upper surface of the steam port 57. Also the outer lid
A cylindrical vertical rib 82 hanging downward from the periphery of the steam port cover 81 is formed integrally with the 52. An opening 58 in the lower end of the vertical rib 82 and the upper surface of the lid lower plate 54 is formed.
Is hermetically sealed with a steam port packing 83 made of an elastic material such as silicone rubber. Further, the steam outlet cover portion 81 has a steam outlet 84
Is formed in the upper surface, and a vertical wall 85 is formed as a partition wall extending downward from the vapor discharge port 84.

A bucket 86 is removably accommodated in the hole defined by the vertical rib 82 and the opening 58. The bucket 86 is mounted by a projection 87 partially formed on the outer surface of the bucket 86 being hooked on a receiving portion 88 formed on the steam port packing 83. The bucket 86 has a bottomed cylindrical shape, and has a gap between a flange 89 formed by extending horizontally on the outer periphery of the bottom and a portion around the opening 58 of the lid lower plate 54. Form a vapor inlet 91. On the bottom of the bucket 86, an oneva return hole 92 made of a small hole having a diameter of about 1 to 2 mm is formed, and a check valve 93 made of an elastic member such as silicone rubber is mounted. The oneva return hole 92 is normally closed by a check valve 93 from below. Further, the gap between a portion other than the convex portion 87 on the outer surface of the bucket 86 and the inner periphery of the steam port packing 83 and the gap between the outer surface of the bucket 86 and the inner surface of the vertical rib 82 are:
A vertical steam passage hole 94 that extends from the steam inlet 91 to the steam outlet 84 is formed. Note that the opening area of the oil return hole 92 is smaller than the planar opening area of the steam passage hole 94. Further, the upper surface opening of the bucket 86 is provided with a partition plate 96.
The partition plate 96 has a storage port 97 formed in a peripheral portion thereof, which is opposed to the steam discharge port 84 of the steam port cover section 81 with the vertical wall 85 interposed therebetween. A steam hole 99 is formed in the center of the steam port cover 81 so as to face the shield plate 98 at the center from below.

Then, at the time of cooking rice, the heating layer 15 of the pan 11 generates heat by applying a high-frequency current to the heating coil 21, and the pan 11 is heated. This heating is controlled according to the temperature of the pan 11 detected by the pan temperature sensor 23 and the like, and rice is cooked in a predetermined heating pattern. This heating pattern is similar to a rice cooker with an inner lid, and the most important time is the water temperature of 60 ° C.
From the time until steam is generated, rice heating is performed with the maximum heating amount without reducing the heating amount. afterwards,
The amount of heating is reduced until cooked, and when it becomes spotty, the amount of heating is further reduced. Then, after the spotting, the heat is kept, and the rice in the pot 11 is kept at a predetermined temperature. In addition,
The side heater 25 and the lid heater 72 perform heating during rice cooking and heat retention.
Dew condensation is prevented.

The steam S generated in the pot 11 particularly during rice cooking enters the steam port 57 from the steam inlet 91 as shown by the solid line arrow, rises in the steam passage hole 94, and It collides with the mouth cover part 81 and the vertical wall 85. As a result, the steam S and the tonnage O contained in the steam S are separated, and the tongue O having a large specific gravity is dropped and stored in the bucket 86 from the storage port 97 as shown by a chain line. On the other hand, the steam is discharged from the rice cooker main body 1 through the steam discharge port 84. Also bucket
The steam S entering 86 passes through the steam hole 99 and returns to the bucket.
86 flows out and is released from the steam discharge port 84
The steam S flowing out of the steam 99 once strikes the shielding plate 98 of the steam port cover 81, whereby the steam O flowing out of the steam hole 99 is separated from the steam O, and the steam O exits the steam outlet 84. Is prevented. When the rice cooks, the amount of heating decreases due to spots and the inside of the pan 11 cools, the non-return valve 93 is deformed so that the check valve 93 is pulled inside the pan 11 which has become a negative pressure due to the release of steam S. The return hole 92 is opened. As a result, during the cooking, the rice O or dew accumulated in the bucket 86 is collected in the pan 11 from the oil return hole 92, and the water does not remain in the bucket 86.

According to the configuration of the above embodiment, the lid lower plate 54
Is made of a stainless steel material, so that the strength is higher than that of a lid lower plate made of a conventional aluminum material. In addition, a plurality of irregularities 71
The strength of the lid lower plate 54 is further improved by work hardening. Thereby, sufficient strength of the lid 51 can be secured. By increasing the strength of the lid body 51, the lid lower face plate 54 is less likely to be deformed when wiping dirt such as lumps O on the lid lower face plate 54, and the cleaning performance is improved.

As described above, the uneven portion 71 has the effect of increasing the strength of the cover lower plate 54. However, if the back surface of the cover lower plate 54 has little unevenness, the cover heater 72 and the cover The lid lower plate 54 can be efficiently heated without the adhesiveness to the lower plate 54 being deteriorated. Further, in a rice cooker in which the lid heater 72 is a cord heater and is covered with an aluminum foil and bonded with an adhesive, the lid heater 72 is less likely to be peeled off by securing a bonding area.

Further, since the stainless steel material has a higher heat radiation efficiency than the aluminum material, the lower cover plate 54 can be used for cooking rice.
The upper surface of the cooked rice such as rice can be efficiently heated by the radiant heat from the rice, and the moisture at the top of the rice can be reduced to improve the cooked rice.

Further, since the steam port 57 is provided at a position on the lower surface plate 54 of the lid facing substantially the center of the upper opening of the pan 11,
The steam port 57, which is not easily heated by the heating of the lid 51, and the outer peripheral portion of the lid lower plate 54 to which the lid packing 64 is attached are concentrically positioned. Is almost the same in all parts. And
Since the lid heater 72 is disposed substantially uniformly around the steam port 57 on the back surface of the lid lower plate 54, the lid heater 72
As a result, the lid lower plate 54 can be uniformly heated, local heating of the lid lower plate 54 is suppressed, and temperature unevenness is reduced. In particular, by disposing the lid heater 72 in the vicinity of the steam port 57 and the lid packing 64, the heating density of those parts that are easily cooled by the outside air and have a poor temperature-raising property is increased, so that a temperature decrease due to the outside air is prevented, Temperature unevenness on the entire surface of the lid lower plate 54 can be suppressed. Thus, even though stainless steel having lower thermal conductivity than aluminum is used for the material of lid lower plate 54, it is possible to uniformly heat lid lower plate 54.
Thereby, at the time of cooking rice, the upper part of the cooked material such as rice can be evenly heated, and uneven cooking can be reduced. Also, when cooking and keeping warm, the low-temperature part is reduced, so the amount of condensation of steam is reduced as a whole.
When the lid 51 is opened, the dew that has condensed on the lid packing 64 and the steam port 57 flows down to the upper part of the rice cooker main body 1, thereby suppressing the inconvenience of soiling the rice cooker main body 1. At the same time, during the heat retention, the dew that has condensed on the steam port 57 etc. will drip onto the rice,
The problem that the rice is partially over-hydrated and becomes uncomfortable is also prevented.

Further, since the lid heater 72 for heating the lid lower plate 54 is a code heater, unlike the case of electromagnetic induction heating, the material of the lid lower plate 54 is not limited to magnetic metal such as ferrite. The material of the lower plate 54 can be made of a material that is not easily rusted, for example, an austenitic material.
This prevents inconvenience that the lid lower plate 54 rusts during use, and eliminates the need for a special rust preventive treatment or the like, thereby improving productivity.

Further, the local heating in which only the portion facing the heating coil becomes high in temperature as in the case of electromagnetic induction heating is reduced, and the effect of the arrangement of the steam port 57 and the lid heater 72 on the lid lower plate 54 as described above. Together with this, the temperature unevenness can be reduced.

Further, since the heating coil is not provided, the problem that the weight of the entire lid 51 becomes too heavy does not occur. Therefore, the elastic force of the elastic member that applies a force in the opening direction to the lid 51 does not need to be particularly strong.
When the 51 is opened, the impact force applied to the hinge shaft 55 does not increase. Therefore, even when the pan 11 is empty and the weight is light, the rice cooker main body 1 does not jump backward when the lid 51 is opened. Also,
Since there is no need to provide a damper mechanism or the like for reducing the impact when the lid 51 is opened at the hinge shaft 55, productivity is improved by simplifying the structure.

Also, since the temperature of the lid lower plate 54 when the lid heater 72 continuously heats the lid lower plate 54 is set to 170 ° C. or less, the control of the bidirectional thyristor for controlling the lid heater 72 is performed. If the element breaks down or the lid temperature sensor 73 breaks and the temperature cannot be detected normally, the outer lid cover 53 made of polypropylene melts even if heating by the lid heater 72 is performed continuously. Is prevented. Therefore, the inconvenience that the lower surface of the lid 51 must be replaced after the cause of the failure is repaired is eliminated, and the repairability is improved.

In addition, according to the configuration of the steam port 57 of the above embodiment, the water level line (not shown) on the inner surface of the pot 11 is slightly increased to make a wrong or soft cooking. +
30- + 180mm) Even when water is cooked and cooked, the tongue O blown up together with the steam S is collected in the bucket 86 and overflows from the steam discharge port 84 together with the steam S to be spilled or scattered. Is suppressed. During cooking rice, the return hole 92 is closed by the check valve 93, and the intrusion of steam S into the bucket 86 from the return hole 92 is prevented. By heating, the rice cake O accumulated in the bucket 86 becomes bucket
It does not blow up from the inside of 86, and spills are more reliably prevented. On the other hand, if it becomes spotty, bucket 86
Since the stored O is collected in the pot 11 as described above, when the lid 51 is opened, the O is discharged from the steam outlet 84.
Does not flow out of In this way, it is possible to prevent the upper surface of the lid 11, the rice cooker main body 1 and the floor from being stained with the rice O during and after the rice cooking.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example,
Although the rice cooker of the above-described embodiment heats the pot 11 by electromagnetic induction, it may be a jar rice cooker configured to heat the pot from the outside with a sheath heater or the like.

[0037]

According to the first aspect of the present invention, in the rice cooker without the inner lid, the material of the lid lower surface member for closing the upper opening of the pot is made of stainless steel, so that the strength of the lid is improved. Thereby, it becomes easy to wipe off the dirt on the lid lower surface member, and the cleaning property is improved. In addition, a steam port is provided at a position on the lower surface of the lid and substantially opposite the center of the upper opening of the pot, and a heating means for heating the lower surface of the lid is provided on the back surface of the lower surface of the lid, with the steam port as a center. substantially uniformly arranged, the
Since a plurality of concave and convex portions are formed on the surface of the lid lower surface member, uneven heating of the lid lower surface member by the heating means can be suppressed, and therefore, uneven heating of rice during cooking or keeping warm can be prevented, and each part of the lid lower surface member can be prevented. Can also prevent condensation. Ma
The lower surface of the lid made of stainless steel has high strength.
Since a plurality of irregularities were formed on the surface of the lid lower member,
Strength of the lid bottom surface member by work hardening is improved further. This
As a result, sufficient strength of the lid can be secured, and
When wiping off dirt such as rice, the bottom surface of the lid may be deformed.
It becomes difficult, and the cleaning property is improved.

According to the rice cooker of the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the heating means of the lower surface member of the lid is a cord-shaped heater, the weight of the lid can be reduced. Since the heater is disposed near the steam port and near the lid packing, it is possible to reliably prevent dew condensation in the vicinity of the steam port and the lid packing where the temperature is liable to decrease due to invasion of outside air or the like.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a first arrangement of a lid heater on the upper lid lower surface member.
It is a bottom view showing an example.

FIG. 3 is a diagram showing a second arrangement of the lid heater on the upper lid lower surface member.
It is a bottom view showing an example.

FIG. 4 is a diagram showing a third arrangement of the lid heater on the upper lid lower surface member;
It is a bottom view showing an example.

FIG. 5 is a fourth view showing the arrangement of the lid heater on the upper lid lower surface member.
It is a bottom view showing an example.

FIG. 6 is a diagram showing a fifth arrangement of the lid heater in the lower lid lower member;
It is a bottom view showing an example.

FIG. 7 is a bottom view of a lid lower member showing an example of a conventional rice cooker.

FIG. 8 is a bottom view of a lid lower member showing another example of a conventional rice cooker.

[Explanation of symbols]

 1 Rice cooker body 11 Pot 51 Lid 54 Lower lid plate (lower lid member) 57 Steam port 64 Lid packing 72 Lid heater (heating means)

Claims (2)

(57) [Claims] 1. A rice cooker main body for accommodating a pot, a lid provided on the upper side of the rice cooker so as to be openable and closable, and a steam port provided on the lid to discharge steam to the outside during cooking rice. The lower surface member of the lid, which forms the lower surface of the lid and closes the upper opening of the pot, is made of stainless steel. A port is provided, and a heating means for heating the lid lower surface member is provided substantially uniformly on the back surface of the lid lower surface member around the steam port, and a plurality of heating means are provided on the surface of the lid lower surface member.
A rice cooker characterized by forming irregularities . 2. The heating means comprises a cord-shaped heater, and the heater is provided in the vicinity of the steam port and on the outer periphery of the lid lower surface member to seal the lid lower surface member and the pan. 2. The rice cooker according to claim 1, wherein the rice cooker is arranged near the packing.