JP3398948B2 - rice cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rice cooker such as a rice cooker that also serves as a jar.

[0002]

Conventionally, for example, Japanese Unexamined Patent Publication No.
In JP-A-224516, a lid heater, which is a cord-shaped electric heater, is provided on the back side, that is, the upper side of a heat dissipation plate mounted inside the outer lid, and a U-shaped portion of the lid heater is provided around the vapor discharge hole. There is disclosed a rice cooker which is arranged so as to prevent bubbles of the bean around the steam discharge hole and spillage from the steam discharge hole.

However, the rice cooker having such a structure has the following drawbacks. Since the vapor discharge holes are provided on the outer peripheral portion side of the heat dissipation plate, it is difficult to dispose the lid heater particularly in a portion where the distance between the vapor discharge hole and the outer peripheral portion of the heat dissipation plate is narrow. Therefore, it is difficult to dispose the lid heater around the entire opening of the steam discharge hole, which causes a partial temperature drop of the steam discharge hole. Further, the heating from the radiant plate to the upper part of the pan becomes non-uniform due to the deviation of the steam discharge holes, which causes uneven cooking. Further, if the lid heater is forcibly arranged in a narrow portion between the vapor discharge hole and the outer peripheral portion of the heat dissipation plate, it takes time and effort to mount the lid heater, resulting in deterioration of manufacturability. If the lid heater is arranged as close as possible to the periphery of the vapor discharge hole to set the arrangement pattern of the lid heater, the arrangement pattern has a complicated shape and the manufacturability of the lid heater is further deteriorated. Depending on the arrangement pattern of the lid heater, the connection terminal portions of the lead wires for power supply to the two lid heaters at both ends of the lid heater must be provided at different positions, so that the lead wires should be placed from almost the same location. Since it becomes impossible to arrange the lead wires, the lead wires become unnecessarily long, and it becomes difficult to perform wiring processing. Also, since the connection terminal portion, which is a non-heated portion, is dispersed,
There is also a problem of uneven heating. If the temperature sensor that detects the temperature of the heat sink is provided above the heat sink, the lead wire of this temperature sensor and the lead wire of the lid heater may overlap depending on the position of the temperature sensor, making wiring processing more difficult. become.

In view of the above problems, the present invention prevents partial lowering of the temperature of the lid lower surface member, uniformly heats the entire lid lower surface member, and manufactures when the electric heater is attached to the lid lower surface member. Can be improved , and further under the lid
A first object of the present invention is to provide a rice cooker capable of improving the strength of a surface member .

A second object of the present invention is to provide a rice cooker which suppresses uneven heating of the lid lower surface member and can easily and rationally perform the lead wire processing of the electric heater.

A third object of the present invention is to provide a rice cooker capable of preventing uneven cooking by uniformly heating the upper part of the pan during rice cooking.

A fourth object of the present invention is to provide a rice cooker which can easily and rationally perform wiring processing including the lead wires of the temperature detecting means of the lid lower surface member.

[0008]

In order to achieve the first object, the rice cooker of the present invention according to claim 1 has a steam discharge hole substantially in the center of the lid lower surface member directly facing the opening of the pan. A plurality of rows of cord-shaped electric heaters are arranged between the outer peripheral portion of the lid lower surface member and the vapor discharge holes on the back side of the lid lower surface member. In the vicinity of the outer peripheral portion and in the vicinity of the opening of the vapor discharge hole ,
The lid lower surface member is formed by forming an uneven portion on the surface thereof .

According to the structure of the rice cooker of the first aspect, the distance between the outer peripheral portion of the lid lower surface member and the steam discharge hole is substantially the same over the entire circumference of the steam discharge hole, and therefore the rice cooker is provided therebetween. The space for disposing the electric heater is sufficiently secured without being partially insufficient. Therefore, the electric heaters can be arranged in a plurality of rows to uniformly heat the lid lower surface member. Further, since a part of the electric heater is provided near the outer peripheral portion of the lid lower surface member where the outside air easily enters and cools, and near the opening of the vapor discharge hole, the periphery of these portions is partially It is possible to heat the entire lid lower surface member without lowering the temperature, and it is possible to uniformly heat the entire lid lower surface member. Moreover, even if the arrangement pattern of the electric heater is set so that the electric heater is located around the steam discharge hole, the electric heater is sufficiently arranged over the entire circumference of the steam discharge hole. Eliminates the trouble of mounting the heater and the deterioration of manufacturability. At the same time, the arrangement pattern of this electric heater is not restricted by the position of the vapor discharge hole and does not have a complicated shape.
The manufacturability of the electric heater is further improved. Furthermore, the lower surface of the lid
The material has unevenness on the surface to improve strength by work hardening
I am letting you.

Further, in order to achieve the second object, the rice cooker of the present invention according to claim 2 connects the electric heater and the lead wire for supplying power to the electric heater with each connection terminal portion. Are arranged in parallel and close to each other, and the connection terminal portions are provided on the outer peripheral portion of the lid lower surface member.

According to the structure of the rice cooker of the present invention, by arranging the connection terminal portions in parallel with each other and in close proximity to each other, the connection terminal portions can be concentrated at one place, and the connection terminal portion which is a non-heat generating portion. Does not disperse, and uneven heating of the lid lower surface member can be suppressed. Further, since the lead wires connected to the respective connection terminal portions can be pulled out from substantially the same place, the wiring process at the time of assembly becomes easy. Further, by arranging each connection terminal portion on the outer peripheral portion of the lid lower surface member, the connection terminal mounting position can be brought closer to the lead wire lead-out portion of the electric heater, so that the length of the lead wire is the shortest dimension. It becomes possible to wire reasonably.

Further, in order to achieve the third object, the rice cooker of the present invention according to claim 3 is provided with the steam discharge hole at a position facing substantially the center of the opening plane of the pot upper portion. To be done.

According to the structure of the rice cooker of the third aspect, radiant heating can be uniformly performed from the lid lower surface member to the upper part of the pot by the electric heater arranged around the steam discharge hole with the steam discharge hole at the center. Therefore, it is possible to evenly heat the upper part of the pan when cooking rice.

Further, in order to achieve the fourth object, the rice cooker of the present invention according to claim 4 is provided with a temperature detecting means for the lid lower surface member in the vicinity of the connection terminal portion.

According to the rice cooker of the present invention, the lead wires of the electric heater and the lead wires of the temperature detecting means can be wired substantially in parallel, and it is possible to avoid overlapping of these lead wires. Wiring processing including the lead wires of the temperature detecting means becomes easier. Further, since the lead wire of the temperature detecting means is also arranged on the outer peripheral portion of the lid lower surface member, it is possible to perform rational wiring with the shortest dimension as in the lead wire of the electric heater.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the rice cooker of the present invention will be described below with reference to the drawings. The rice cooker of this embodiment is a rice cooker that also serves as a jar. First, referring to FIG. 1, the overall configuration will be described. 1 is a rice cooker body,
This is a bottomed cylindrical inner frame 2 having an open top surface, an outer frame 3 that is equipped with the inner frame 2 and forms an outer shell of the rice cooker body 1, and a bottom plate 4 that covers the bottom side of the outer frame 3. Consists of. An annular rib-shaped pot support portion 5 is formed at the upper end of the inner frame 2 that forms the pot storage portion. On the other hand, a cutout portion 6 is formed at the upper end portion of the outer frame 3 located on the outer periphery of the pot support portion 5. The inner frame 2 is made of FR-PET resin.
It is formed in a shape substantially similar to the shape of the outer surface of the pan 8 which is detachably accommodated inside.

The pan 8 for containing cooked rice such as rice and water is
It is formed in a bottomed cylinder shape having an opening 9 on the upper surface. The upper end of the outer surface of the pan 8 is formed with a flange portion 10 protruding horizontally outward, and further covers the flange portion 10 to cover the pan handle portion.
11 are provided. Further, the pot 8 is formed by a pot body 12 mainly made of an aluminum material and a heating layer 13 made of a magnetic metal material provided from the lower side surface to the bottom surface of the pot body 12.

Reference numeral 15 is a heating coil which is provided outside the inner frame 2 and serves as a heating means for heating the heating layer 13 of the pan 8 by electromagnetic induction. The heating coil 15 is spirally wound and fixed on the outer surface of the inner frame 2 so as to face the heat generating layer 13 of the pan 8. Further, on the outside of the heating coil 15, there is provided a coil cover 16 in which a high-permeability material powder mainly composed of iron oxide or the like is mixed with a plastic material. As a result, the heating coil 15 is fixed to the inner frame 2, leakage of magnetic flux is prevented, and the heating layer 13 is efficiently induction-heated. In addition, 17 is a pan temperature sensor that has a negative characteristic thermistor inside and that detects the temperature of the bottom of the pan 8, and 18 is located near the heating layer 13 and the heating coil 15 and is provided on the outer surface of the inner frame 2. It is a thermal fuse. Further, reference numeral 19 is a side surface heater which is a heating means for heat retention provided on the upper side of the outer surface of the inner frame 2.

Reference numeral 21 is a heating substrate provided with an inverter circuit component 22 for supplying a predetermined high frequency current to the heating coil 15. And the heating coil 15 from the inverter circuit
When a high-frequency current is supplied to the heating coil 15, an alternating magnetic field is generated in the heating coil 15, an eddy current is generated in the heating layer 13 of the pan 8 in the magnetic field, and the eddy current is converted into Joule heat to generate the heating layer 13. Generates heat and heats the pan 8. The heating board 21 is arranged between the bottom plate 4 at the bottom of the rice cooker body 1 and the support 23 together with the cooling fan 25 having the motor 24 by the support 23 provided inside the rice cooker body 1. An intake port 26 is provided in the bottom portion of the bottom plate 4 facing the cooling fan 25, and an exhaust port 27 is provided in the side surface portion of the bottom plate 4 facing one side of the heating substrate 22. Support
23 is provided upright on one side of the heating substrate 22, and an LCD 29, an LED 30, and various switches 31 forming an operation panel 28 are provided between the support 23 and the front surface of the rice cooker body 1. Further, the display operation component 32 and the power supply circuit component 33 are provided in a state of being mounted on the substrate 34. 35
Is a cord reel for winding the power cord 36 provided on the lower rear side of the outer frame 3. Reference numeral 41 is a lid that covers the upper opening of the pan 8 so as to be openable and closable. The lid body 41 includes an outer lid 42 made of plastic such as polypropylene, an outer lid cover 43 provided along the lower outer periphery of the outer lid 42, and a space below the outer lid 42 to form a space. And a lid lower surface plate 44 as a lid lower surface member forming the lower surface of the lid body 41. The lid 41 is pivotally supported by the hinge shaft 45 on the upper rear side of the rice cooker body 1. Although not shown, inside the hinge shaft 45, an elastic member such as a torsion coil spring that constantly applies a force to the lid 41 in the opening direction is provided. On the other hand, the rice cooker body 1 on the opposite side of the hinge shaft 45
A clamp 46 for holding the lid 41 in the closed state with respect to the rice cooker main body 1 is provided on the upper part of or in the upper surface of the lid 41 against the force exerted by the elastic member. Also, the lid 41
Is provided with a steam port 47 which is a steam discharge hole for discharging steam generated in the pan 8 during rice cooking to the outside of the rice cooker body 1.
The vapor port 47 will be described in detail later, but the lid bottom plate 44
An opening 48 having a diameter of about 50 mm is formed at a position facing the center of the inner diameter of the plane of the opening 9 that forms the upper portion of the pot 8, forming a portion of the steam port 47 on the pot 8 side. When the opening 48 is a round hole, its diameter is 10 to 50 mm, preferably
Form to 20-40 mm. This is because if the hole diameter of the opening portion 48 is too small, the cleaning property of the inside of the steam port 47 through the opening portion 48 deteriorates, and the steam pressure inside the pot 8 increases, causing spillage and deformation of the lid lower surface plate 44. If the diameter of the opening 48 is too large, the outside air is likely to enter during the heat retention, and the dew attached to the inside of the steam port 47 due to cooling is prevented from dripping on the rice in the pan 8. Then, from the opening 48,
The distance to the outer periphery of the lid lower surface plate 44 is substantially the same in all parts.

A flange portion 51 which rises upward is formed on the outer periphery of the lid lower surface plate 44, and the flange portion 51 is fixed to the upper side of the inner peripheral portion of the annular outer lid cover 43 by a screw 52. Further, the lower surface of the outer peripheral portion of the lid lower surface plate 44 facing the pan 8 is formed into an annular convex portion 53. And
Between the flange portion 51 of the lid lower surface plate 44 and the outer lid cover 43,
An annular lid packing 54 made of an elastic material such as silicone rubber is held. The lower part of the lid packing 54 is formed by an upper tongue piece 55 and a lower tongue piece 56 into a substantially U-shaped or U-shaped cross section to form a bag-shaped space 57. The lower surface of the piece 56 contacts the inner surface side of the opening 9 of the pan 8. In this way, the lid lower plate 44 and the pan 8 are covered with the lid packing 54.
Is sealed in a hermetically sealed state. It should be noted that a tongue piece 55, a bag-shaped space 57 is formed below the inner peripheral portion of the outer lid cover 43.
A stepped recess 58 for accommodating 56 is formed.

The lid bottom plate 44 is made of rust-resistant austenitic stainless steel or aluminum material such as SUS304. The lower side of the lid lower surface plate 44, that is, the front side, is the pan 8
It directly faces the opening 9 and has a structure without a so-called detachable inner lid (inner lid-less). Lower lid plate 44
In the case where is formed of a stainless steel material, the material strength is stronger than that of a conventional aluminum material, so the material thickness t is set to about 0.3 to 1 mm, preferably 0.4 to 0.6 mm. On the other hand, the lid bottom plate 44
When the is made of aluminum material, the thickness t is 0.5 mm to 4.
The thickness is set to 0 mm, but especially when the surface is coated with fluorine or the like, the material thickness t is set to 1.2 mm to 3.5 mm in consideration of the surface blasting and the prevention of deformation during baking. Also, the lid bottom plate
When anodizing the surface of 44, the material thickness t is 0.7 mm
Approximately 1.2 mm, and is constructed so as to be stronger than the lid lower surface plate 44 of the conventional structure. The reason for this is to prevent the lowering of the strength of the lid lower surface plate 44 due to the opening 48 being substantially at the center of the lid lower surface plate 44, and to prevent the lid lower surface plate 44 from being easily soiled by the inner lidless.
This is to prevent deformation of the lower surface plate 44 during cleaning and improve the cleanability of the lid lower surface plate 44.

The lower surface plate 44 of the lid has an uneven portion 61 formed on the surface to improve the strength by work hardening. In manufacturing, the concave portion of the uneven portion 61 is stamped and formed into a predetermined shape. It is press molded. The concavo-convex portion 61 has a concave stamp formed on at least the surface facing the pan 8 side,
The inside of the lid 41 on the back side corresponding to the recess is substantially flat or a lid heater 62 which is a cord-shaped electric heater.
The convex shape has a small protrusion height and is small enough to allow the adhesive bonding. On the other hand, on the front side of the lid lower surface plate 44 (the side of the pan 8), the deeper the depth of the concave engraved concave portion is, the higher the effect of improving the strength is, but the surface is difficult to wipe. Is preferably kept within about 1 mm. The plane shape of the recess is not particularly limited, and may be selected in consideration of design, such as a circle, an ellipse, a triangle, and a hexagonal pattern. Further, after the lid lower surface plate 44 is formed into a predetermined shape, it is subjected to buffing to give a metallic luster to improve the appearance, and is formed so that the adhesion of O, which will be described later, will not be noticeable.
As the metallic luster of the lid lower surface plate 44, a plate material that has been processed in advance before pressing may be used, and the uneven portion 61 is not always necessary. The point is that the lid lower surface plate 44 may be formed so that the adhesion of the oneoba O is less noticeable due to the luster and dirt can be easily wiped off.

Next, the structure of the back side of the lid bottom plate 44 is shown in FIG.
~ Detailed description will be given with reference to FIG. 7. The lid lower surface plate 44 shown in FIGS. 6 and 7 is shown with the concave and convex portions 61 omitted for convenience.
The lid heater 62 is provided on the rear surface of the lid lower surface plate 44 with the lid lower surface plate 44.
Are arranged in a plurality of rows between the outer peripheral portion 63 and the steam port 47. Specifically, for example, as shown in FIG. 2 or FIG. 4 which is a modified example, the heater is formed in a double annular shape from one end 62A and the other end 62B of the lid heater 62 along the outer peripheral portion 63 of the lid lower surface plate 44. Body 62
C is extended, and the heater main body 62C is arranged in a single annular shape so as to surround the opening 48 of the steam port 47. The lid heater 62 only needs to be partially provided in the vicinity of the outer peripheral portion 63 of the lid lower surface plate 44 and in the vicinity of the opening portion 48 forming the pot 8 side of the steam port 47, for example, another modification. As shown in FIG. 3 as an example, the heater main body 62 of the lid heater 62 is surrounded by the opening 48.
C may be arranged in a double annular shape. Further, as shown in FIG. 5 which is another modified example, the heater main body 62C of the lid heater 62 is arranged in a double polygonal shape along the outer peripheral portion 63 of the lid lower surface plate 44, and the opening is formed. It may be arranged in a double square shape surrounding the portion 48.

As shown in FIG. 6, the lid heater 62 is sandwiched between an aluminum foil 65 and a double-sided adhesive tape 66 in which an acrylic or silicone adhesive is provided on the surface of a non-woven fabric substrate. By attaching the double-sided adhesive tape 66 to the back surface of the lid lower surface plate 44, the lid heater 62 is covered with the aluminum foil 65,
It is adhesively fixed to the back surface of the lid lower surface plate 44. Also, the heater body
The distance (pitch) L1 between the lid heaters 62 where 62C are arranged substantially in parallel is determined by the diameter d of the lid heater 62 itself. If the diameter d is 2.0 mm, the pitch L1
Is 6.0 mm or more and the diameter d is 3.0 mm, the distance L1 is 9.0
The pitch L1 is at least 3 mm, and at least 3 times, and preferably 4 times or more, the diameter d of the lid heater 62. This reliably adheres the aluminum foil 65 sandwiching the lid heater 62 to the lid lower surface plate 44, improves the adhesion between the lid heater 62 and the lid lower surface plate 44, and increases the diameter d of the lid heater 62. Accordingly, the elastic force of the lid heater 62 becomes stronger, and this is because the adhesive force of the aluminum foil 65 to the lid lower surface plate 44 increases. Further, in order to suppress uneven heat generation of the lid lower surface plate 44, the lid heater
It is desirable to make the pitch L1 between 62 as small as possible under the above conditions.

On the other hand, the lid heater 62 and the outer peripheral portion 63 of the lid lower surface plate 44
The distance L2 between the lid heater 62 and the outermost periphery of the opening 48 of the steam port 47 is 5 mm to 40 mm, preferably 10 mm to 20 mm. This is due to the adhesiveness of the aluminum foil 65 of the lid heater 62, the outer peripheral portion 63 of the lid lower surface plate 44 and the steam holes 47.
When the distance L2 is too short, the adhesive area of the aluminum foil 65 is not sufficiently secured during this time, and the adhesion of the lid heater 62 to the lid lower surface plate 44 becomes uncertain. On the contrary, if the distance L2 is too large, the heating during this period becomes insufficient.

Reference numeral 71 is a lead wire for supplying power to the lid heater 62. This pair of lead wires 71 and one end of the lid heater 62
Two connection terminal parts 72 for connecting 62A and the other end 62B
Are located on the outer peripheral portion 63 of the lid lower surface plate 44 and are arranged in parallel and close to each other. The lid heater 62 and the lead wire 71 are connected to a charging portion by a metallic connection terminal portion 72, and the outer surface of the connection terminal portion 72 is covered with an insulating tube 73 such as silicone rubber. That is, the connection terminal portion 72 has a larger diameter than the lid heater 62. The connection terminal portion 72, like the lid heater 62,
While being covered with the aluminum foil 65, it is adhesively fixed to the back surface of the lid lower surface plate 44 by the double-sided adhesive tape 66. Therefore, the area of the aluminum foil 65 required to bond the connection terminal portion 72 needs to be larger than that of the lid heater 62. This connection terminal part
If 72 is appropriately provided in the middle of the arrangement pattern of the lid heater 62, a non-heated portion is partially formed in the arrangement pattern, and a large area of aluminum foil 65 is used to bond the connection terminal portion 72.
Is required, and the arrangement of the lid heater 62 is restricted, which is a drawback. In order to eliminate these drawbacks, the connection terminal portions 72 are arranged in parallel and close to each other, so that the portion to be heated is made as small as possible, and in addition, the lid heater 62
The layout is configured so as not to be restricted as much as possible. Further, as described above, the opening 48 of the steam port 47 provided substantially in the center of the lid lower surface plate 44 is provided at a position facing substantially the center of the plane of the opening 9 forming the upper portion of the pot 8. As a result, the heating by the lid heater 62 provided on the back surface of the lid lower surface plate 47 centering on the steam port 47 is uniformly radiated to the entire opening 9 in the upper portion of the pan 8 to reduce uneven heating. The lid heater 62 and the side heater 19 electrically form a parallel circuit, and are connected to a switching control element such as a bidirectional thyristor by a series circuit to control a predetermined energization time during cooking rice. The lower surface plate 44 of the lid and the inner frame 2 are each heated during heat retention.

Reference numeral 74 is a lid temperature sensor composed of a negative characteristic thermistor for detecting the temperature of the lid lower surface plate 44. The lid temperature sensor 74 corresponding to this temperature detecting means is pressed against the lid lower surface plate 44 via the silicone sponge 76 by the sensor retainer 75 provided on the outer lid 42 (see FIG. 1). The lid temperature sensor 74 has a pair of lead wires 77 connected to both ends thereof,
The outer surface of the connection with the lid temperature sensor 74 and the lead wire 77,
It is covered with an insulating tube 78. Also, the lid temperature sensor
74 is sandwiched between a double-sided adhesive tape 79 adhered to the lid lower surface plate 44 and an aluminum foil 80, and is arranged in the vicinity of the terminal connecting portion 72, and the lead wire 77 of the lid temperature sensor 74 is A lid temperature sensor 74 is bonded to the lid lower surface plate 44 via an aluminum foil 80 in a state of being parallel to the lead wire 71 of the lid heater 62. Then, the aluminum foil 65 is bonded to the upper part of the aluminum foil 80 covering the lid temperature sensor 74 with the double-sided adhesive tape 66 interposed therebetween. Note that the positional relationship between the terminal connecting portion 72 and the lid temperature sensor 74 may be arranged in a substantially straight line shape as shown in FIG. 5, or may be slightly stepped as shown in FIGS. It may be placed at. In short, the lid temperature sensor 74 may be arranged near the terminal connecting portion 72 on the outer peripheral portion 63 of the lid lower surface plate 44.

Next, the structure of the steam port 47 will be described with reference to FIGS. 1 and 8. On the upper surface portion of the outer lid 42, a steam port cover portion 81 is integrally formed at a portion facing the opening portion 48 of the lid lower surface plate 44. The steam port cover portion 81 closes the upper surface of the steam port 47 and forms the outer surface of the lid 41. Further, the outer lid 42 is integrally formed with an annular vertical rib 82 that hangs downward from the peripheral portion of the steam port cover portion 81. Then, the lower end of the vertical rib 82 and the lid bottom plate
A vapor port packing 83 made of an elastic material such as silicone rubber and a spacer 84 are interposed between the upper surface of 44 and the peripheral portion of the opening 48, and are hermetically sealed. Further, in the vapor port cover portion 81, a vapor discharge port 85 is formed in the upper surface portion and a vertical wall 86 as a separating wall extending downward from the vapor discharge port 85 is formed.

A bucket 87 is removably housed inside the hole formed by the vertical rib 82 and the opening 48. This bucket 87 has a cylindrical shape with a bottom, and the upper part thereof has a cylindrical portion 88.
And a partition plate 89 integrally formed with the partition plate 89, and a circumference of the partition plate 89 has a tongue opening 90 having an opening length of about 5 to 10 mm.
In addition, a steam hole 92 having a diameter of about 10 mm is formed in the center of the partition plate 89 so as to face the shielding plate portion 91 at the center of the steam port cover portion 81 from below.

On the other hand, the bottom opening of the bucket 87 is covered with a bucket bottom member 93 made of an elastic member. For this mounting, the flange portion 94 formed on the outer periphery of the bottom portion of the bucket 87 has the engagement groove portion 95 formed on the bucket bottom member 93.
Is engaged with. Further, in order to detachably attach the bucket bottom member 93 to the lid body 41, the annular spacer 84 is fitted into the burring portion 96 formed in the opening 48 of the lid lower surface plate 44, and the lid lower surface plate 44 Is provided between the back surface of the vertical rib 82 and the lower end of the vertical rib 82. Then, by engaging the engagement groove portion 97 formed on the outer peripheral side of the bucket bottom member 93 with the inner peripheral portion of the spacer 84, the bucket 87 can be attached to the lid body 41 together with the bucket bottom member 93. ing. Therefore,
The bucket bottom member 93 does not touch the burring portion 96 of the opening 48, and thus the bucket bottom member 93 can be prevented from being damaged. Further, the opening 48 is formed on the outer periphery of the lower portion of the bucket bottom member 93.
A flange portion 104 that abuts the lower surface of the lid lower surface plate 44 is provided around the, but due to the groove formed on the upper surface of the flange portion 104, between the flange portion 104 and the lid lower surface plate 44, A steam inlet 98 communicating with the inside of the pan 8 is formed. Further, the spacer 84 is partially formed with a slit 100 for communicating the steam inlet 98 with the steam passage hole 99 in the gap between the inner surface of the vertical rib 82 and the outer surface of the bucket 87. The vapor passage hole 99 extends vertically from the vapor inlet port 98 to the vapor outlet port 85. A gap 101 communicating with the inside of the bucket 87 is formed in a part between the lower surface of the flange portion 94 of the bucket 87 and the bucket bottom member 93. Further, facing the gap 101, a tongue return hole 102 having a diameter of about 1 to 2 mm and communicating with the inside of the pan 8 is provided so as to be covered by the engaging groove portion 95 of the bucket bottom member 93. Furthermore, in the bucket 87, the upper surface of the bucket bottom member 93 is formed with an inclined surface 103 which descends toward the return hole 102.

When cooking rice, the heating layer 15 of the pan 8 is heated by the application of high-frequency current to the heating coil 15, and the pan 8 is heated. This heating is controlled according to the temperature of the pan 8 detected by the pan temperature sensor 17, etc., and the 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.
During the period from to the generation of steam, the cooked rice is heated with the maximum heating amount without reducing the heating amount. afterwards,
The amount of heat is reduced until the rice is cooked, and when it becomes uneven, the amount of heat is further reduced. Then, after the steaming, the heat is kept and the rice in the pan 8 is kept at a predetermined temperature. In addition,
The side heater 19 and the lid heater 62 heat during rice cooking and heat retention, but the lid lower surface plate 44 is heated by the lid heater 62.
Condensation is prevented.

Further, especially when cooking rice, the steam S generated in the pan 8 pushes up the bucket bottom member 93 made of an elastic member by its steam pressure. Therefore, if the gap 101 is closed, the return hole 102 is closed, and the return hole 102 is closed.
The steam S is prevented from entering the bucket 87 from 102.
The steam S, as shown by the solid arrow,
98, passes through the slit 100 of the spacer 84, enters the steam port 47, rises in the steam passage hole 94, and the steam port cover 81
It collides with the lower surface of and the vertical wall 85. As a result, the steam S and the salmon O contained in the steam S are separated, and the salient O having a large specific gravity falls into the bucket 87 from the salient port 90 and is accommodated, as shown by the chain line. The steam S on the upper part of the mouth 47 is discharged to the outside of the rice cooker body 1 through the steam discharge port 85. In addition, the steam S entering the bucket 87 is
It flows out of the bucket 87 again through 92, and the steam discharge port
The steam S discharged from the steam outlet 85 but flowing out from the steam hole 92 once hits the shielding plate portion 91 of the steam port cover portion 81, so that the steam S flowing out from the steam hole 92 separates the oxygen O. It is possible to prevent O from coming out from the steam outlet 85.

When the rice cooks, becomes uneven and the amount of heating decreases, and the inside of the pan 8 cools, the bucket bottom member 93 is pulled to the inside of the pan 8 which has a negative pressure due to the release of the steam S. As described above, if the gap 101 is opened, the return hole 102 is opened. As a result, the rice cake O or dew accumulated in the bucket 87 during rice cooking flows along the inclined surface 103 of the bucket bottom member 93 and is collected in the pan 8 from the rice cake return hole 102. Therefore, when the rice is cooked, the bucket 87
If you stay inside, the water will not remain.

According to the structure of the steam port 47, in order to cook the rice accidentally or softly, it is slightly more than the water level line (not shown) provided on the side surface of the pan 8 (+30 to +
180 mm) Even when rice is cooked with water, the squirrel O that is blown up together with the steam S is separated from the steam S when colliding with the lower surface of the steam port cover 81, falls into the bucket 87, and is collected. . Therefore, it is possible to prevent O from overflowing and spilling out from the vapor discharge port 85 to the outside, and it is possible to solve the problem that the upper surface of the lid 41 is soiled. Further, during cooking, the bucket bottom member 93 is pushed upward by the vapor pressure in the pan 8 and the return hole 102 is closed,
The invasion of the steam S from the return hole 102 causes no danger that the bed O accumulated in the bucket 87 is blown up.
Moreover, if cooking rice progresses and becomes uneven, please return holes 10
No. 2 is in the open state, and the one
Since There are collected in the pan 8, dew collected in the server Ke <br/> Tsu preparative 87 when opening the lid 41, it neither flowing to the outside from the vapor discharge port 85, it in the bucket 87 It is possible to eliminate the trouble that the O is left accumulated or the upper surface of the lid 41 is soiled.

Further, the bucket bottom member 93 that elastically deforms according to the steam pressure in the pan 8 makes it possible to make the bottom of the bucket 87 a mechanism without a check valve, and simplify the structure by reducing the number of parts. As a result, productivity can be improved, and since there are no check valves, the number of uneven portions inside the bucket 87 is reduced, so that there is an advantage that the inner surface of the bucket 87 can be easily cleaned.

In this embodiment, since the steam port 47 corresponding to a steam discharge hole is provided in the central portion of the lid lower surface plate 44 directly facing the opening 9 of the pan 8, the outer peripheral portion of the lid lower surface plate 44 is provided. The distance between 63 and the steam port 47 is substantially the same over the entire circumference of the steam port 47. Therefore, the lid heater 62 provided between them
Since the arrangement space of the lid heater 62 is sufficiently secured without being partially insufficient, the lid heaters 62 are arranged in a plurality of rows and the lid lower surface plate 44
Can be heated uniformly. Further, a part of the lid heater 62 is provided near the outer peripheral portion 63 of the lid lower surface plate 44 and the opening 48 of the steam port 47.
Since they are provided in the vicinity of each other, it is easy for outside air to enter from the gap between the lid 41 and the rice cooker body 1 to cool easily, especially when the temperature is kept warm. The periphery of each opening 48 of the steam port 47 can be entirely heated without partially lowering the temperature, and the entire lid lower surface plate 44 can be uniformly heated. Moreover,
Cover the heater so that the cover heater 62 is located around the steam port 47.
Even if the arrangement pattern of 62 is set, as described above, the steam port 47
Since a sufficient space for disposing the lid heater 62 is secured over the entire circumference of the above, it is possible to eliminate the time and labor required for mounting the lid heater 62 in a narrow portion, which has been pointed out in the past, and the deterioration of manufacturability. In addition, the arrangement pattern of the lid heater 62 is not restricted by the position of the steam port 47 and does not have a complicated shape, and the manufacturability of the lid heater 62 is further improved.

That is, a steam port 47 is provided in the central portion of the lid lower surface plate 44 directly facing the opening 9 of the pot 8, and the lid lower surface plate
On the back side of 44, cord-shaped lid heaters 62 are arranged in a plurality of rows between the outer peripheral portion 48 of the lid lower surface plate 44 and the steam ports 47, and a part of the lid heaters 62 is attached to the outer periphery of the lid lower surface plate 44. By providing in the vicinity of the portion 63 and in the vicinity of the opening 48 of the steam port 47, it is possible to prevent a partial temperature decrease of the lid lower surface plate 44, to uniformly heat the entire lid lower surface plate 44, and to cover the lid heater 62. It is possible to improve manufacturability when mounted on the lower surface plate 44.

In addition, the fact that the space for disposing the lid heater 62 is sufficiently ensured means that there is less restriction in setting the position of each connection terminal portion 72 of the lead wire 71 for supplying power to the lid heater 62. As a result, the connection terminal portion 72 can be provided at an arbitrary position on the back side of the lid lower surface plate 44. Therefore, by arranging the two connection terminal portions 72 in parallel and in a close proximity to each other, the bonding space by the aluminum foil 65 can concentrate the necessary connection terminal portions in one place rather than the lid heater 62, and is a non-heat generating portion. The connection terminal portions 72 are not dispersed, and uneven heating of the lid lower surface plate 44 can be suppressed. Further, since the lead wire 71 connected to each connection terminal portion 72 can be pulled out from almost the same place, the wiring process at the time of assembly becomes easy. Furthermore, by arranging each connection terminal portion 72 on the outer peripheral portion 63 of the lid lower surface plate 44, the connection terminal portion is provided at the lead-out portion of the lead wire 71 to the rice cooker body 1 (for example, the hinge portion around the hinge shaft 45).
Since the mounting position of 72 can be close, it is possible to wire the length of lead wire 71 with the shortest dimension,
The lead wire 71 is not unnecessarily lengthened, and rational wiring can be performed.

That is, each connecting terminal portion 72 for connecting the lid heater 62 and the lead wire 71 for supplying power to the lid heater 62,
By arranging them substantially parallel and close to each other, uneven heating of the lid lower surface plate 44 can be suppressed, and the wiring process at the time of assembly can be facilitated.
By providing it on the outer peripheral portion 63, the wiring of the lead wire 71 can be rationally performed with the shortest dimension.

In this embodiment, the steam port 47 is provided at a position facing substantially the center of the plane of the opening 9 at the top of the pan 8. Therefore, since the lid heater 62 arranged around the steam port 47 around the steam port 47 can radiantly heat the lower surface plate 44 of the lid to the upper part of the pan 8 evenly, the upper part of the pan 8 at the time of cooking rice can be improved. The heating can be done evenly.

Further, the lid bottom plate 44 is provided near the terminal connecting portion 72.
Since the lid temperature sensor 74 as the temperature detecting means is provided, the lead wires 71 of the lid heater 62 and the lead wires 77 of the lid temperature sensor 74 can be wired substantially in parallel. Therefore, it is possible to prevent the lead wire 77 of the lid temperature sensor 74 and the lead wire 71 of the lid heater 62 from overlapping with each other, and the wiring process including the lead wire 77 of the lid temperature sensor 74 is further facilitated. Further, since the lead wire 77 of the lid temperature sensor 74 is also arranged on the outer peripheral portion 63 of the lid lower surface plate 44, rational wiring can be performed with the shortest dimension like the lead wire 71 of the lid heater 62. It will be possible.

By the way, the steam port 47 in this embodiment is
When the rice S is cooked, the steam S passing through the slits 100 of the spacer 84 from the steam intrusion port 98 and rising in the steam passage hole 94 collides with the lower surface of the steam port cover portion 81 and its vertical wall 86, so that the steam S escapes from the steam S. The stick O is separated, and the steam S is discharged from the steam discharge port 85, while the stick O is dropped and accumulated in the bucket 87. Therefore, it is possible to prevent the oxygen O from overflowing or scattering from the vapor discharge port 85 together with the vapor S. In addition, the dew accumulated in the bucket 87 during the cleaning is collected in the pan 8 from the tongue return hole 102 along the inclined surface 103 forming the bottom of the bucket 87. Therefore, the lid 41 is opened after cooking rice. At this time, the dew accumulated in the bucket 87 does not flow out from the steam discharge port 85, and the lid 41, the rice cooker main body 1 and the floor surface are not contaminated.

Further, in this embodiment, since the partition plate 89 on the upper portion of the bucket 87 is formed integrally with the bucket 87, the strength is increased and the bucket 87 is deformed when the bucket 87 is cleaned. It won't break. Further, by forming the partition plate 89 integrally with the bucket 87, it is possible to reduce the number of parts and improve the assemblability and the productivity.

Further, the bottom of the bucket 87 is formed by the bucket bottom member 93 which is an elastic body, and the return hole 102 is covered with the engaging groove 95 at the bottom of the bucket 87, so that the steam pressure during rice cooking is increased. Since the return hole 102 is closed by means of,
It is possible to prevent bubbling by the steam S entering from the return hole 102, and the effect of preventing blowout is obtained. Further, compared to the case where the return hole 102 is configured by a check valve as in the conventional case, the number of parts is reduced, the structure can be simplified and the productivity can be improved.
The cleanability of the inner surface of 87 can be improved.

Further, by covering the outer circumference of the opening 48 of the steam port 47 provided on the lid lower surface plate 44 with a plastic spacer 84, and engaging the bucket bottom member 93 as an elastic body with the spacer 84, The burring portion 96 formed on the end surface of the opening 48 can prevent the bucket bottom member 93 from being damaged. Further, since the spacer 84 is provided with the slit 100 for communicating the inside of the pan 8 with the steam passage hole 99, even if the opening 48 is covered with the bucket bottom member 93, the steam discharge port 85 from the inside of the pan 8 The steam passage leading to the above is not blocked by the bucket bottom member 93.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

[0047]

According to the rice cooker of the present invention as defined in claim 1, a steam discharge hole is provided substantially at the center of the lid lower surface member directly facing the opening of the pan, and the lid lower surface member is provided with a steam discharge hole at the center thereof. Cord-shaped electric heaters are arranged in a plurality of rows between an outer peripheral portion and the vapor discharge holes, and a part of the electric heaters is provided near the outer peripheral portion of the lid lower surface member and near the opening of the vapor discharge holes. The lid lower surface member has an uneven portion formed on the surface thereof to prevent partial lowering of the temperature of the lid lower surface member, uniformly heat the entire lid lower surface member, and attach an electric heater to the lid lower surface member. manufacturability when it is possible to improve,
Further, the strength of the lid lower surface member can be improved .

Further, in the rice cooker of the present invention according to claim 2, in addition to the configuration of claim 1, each connection terminal portion for connecting the electric heater and a lead wire for supplying power to the electric heater is substantially formed. The connection terminal portions are arranged in parallel and in parallel, and the respective connection terminal portions are provided on the outer peripheral portion of the lid lower surface member. In addition to the function and effect of claim 1, uneven heating of the lid lower surface member is suppressed, and an electric heater is provided. It is possible to easily and rationally perform the wiring process of the lead wire.

The rice cooker according to a third aspect of the present invention is, in addition to the configuration of the first aspect, provided with the steam discharge hole at a position facing substantially the center of the opening plane of the pot upper portion. In addition to the action and effect of the first aspect, uneven heating can be prevented by uniformly heating the upper part of the pan during rice cooking.

Further, the rice cooker of the present invention according to claim 4 is, in addition to the structure of claims 1 and 2, provided with a temperature detecting means for the lid lower surface member in the vicinity of the connection terminal portion, In addition to the actions and effects of the first and second aspects, the wiring process including the lead wire of the temperature detecting means of the lid lower surface member can be easily and rationally performed.

[Brief description of drawings]

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

FIG. 2 is a front view showing a first example of the upper lid lower surface member.

FIG. 3 is a front view showing a second example of the upper lid lower surface member.

FIG. 4 is a front view showing a third example of the upper lid lower surface member.

FIG. 5 is a front view showing a fourth example of the upper lid lower surface member.

FIG. 6 is a sectional view taken along line I-I of FIG. 2 above.

7 is a sectional view taken along line II-II of FIG. 2 above.

FIG. 8 is a sectional view of a steam port portion of the above.

[Explanation of symbols]

8 pots 9 openings 44 Lower lid plate (lower lid member) 47 Steam port (steam release hole) 48 openings 62 Lid heater (electrical heater) 63 outer circumference 71 Power supply lead wire 72 Connection terminal part 74 Lid temperature sensor (temperature detection means) 77 lead wire

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47J 27/00 103

Claims (4)

(57) [Claims] 1. A steam discharge hole is provided substantially in the center of the lid lower surface member directly facing the opening of the pan, and between the outer peripheral portion of the lid lower surface member and the steam discharge hole on the back side of the lid lower surface member. The cord-shaped electric heaters are arranged in a plurality of rows, and a part of the electric heaters is provided in the vicinity of the outer peripheral portion of the lid lower surface member and in the vicinity of the opening of the vapor discharge hole, and a concave portion is formed on the surface of the lid lower surface member.
A rice cooker characterized in that a convex portion is formed . 2. A connection terminal portion connecting the electric heater and a lead wire for supplying power to the electric heater is arranged in parallel and close to each other, and each connection terminal portion is provided on an outer peripheral portion of the lid lower surface member. The rice cooker according to claim 1, wherein 3. The rice cooker according to claim 1, wherein the steam discharge hole is provided at a position facing substantially the center of the opening plane of the pot upper portion. 4. The rice cooker according to claim 2, further comprising temperature detecting means for the lower surface member of the lid in the vicinity of the connection terminal portion.