JP2017051417A - rice cooker - Google Patents

Abstract

An object of the present invention is to obtain a rice cooker that is technically simple and does not cost, and that suppresses water droplets condensed on an inner lid from being dropped on rice. A main body that houses an inner hook, a lid that is hinged to the main body and covers an upper opening of the main body, a heating means that heats the inner hook, and an inner lid that is attached to the inner hook side of the lid And the inner lid is formed of a porous ceramic material. [Selection] Figure 2

Description

  The present invention relates to a rice cooker provided with an inner lid.

A conventional rice cooker has a problem that steam generated during cooking or heat insulation condenses on the inner lid, and the condensed water drops drip on the rice, thereby impairing the taste.
As a technique for solving this, for example, there is a technique disclosed in Patent Document 1.

In the technique disclosed in Patent Document 1, an inner coil made of a magnetic metal material is provided, and a heating coil for induction heating the inner lid is provided on the lid, and the heating coil is disposed on the center side of the lid. And an outer coil located on the outer peripheral side thereof.
Then, high-frequency currents are applied to the inner coil and the outer coil in different directions in all or any of the steps of cooking, steaming, and heat retention during rice cooking. As a result, the inner lid itself generates heat, and the alternating magnetic field is reflected by the magnetic flux modulation plate made of a non-magnetic metal material. Due to this reflection, high frequency vibration is applied to the inner lid facing the magnetic flux modulation plate. Excited.

  As a result, the inner lid performs high frequency alternating vibration. That is, since the inner lid is heated while being vibrated at high frequency, the steam that is generated in the inner pot and fills the inside is scattered as finer vapor due to the high-frequency vibration. Further, since the inner lid is heated, the vapor that touches the inner lid is not condensed on the surface of the inner lid, the discharge from the steam port is promoted, and the dripping of water droplets on the rice is eliminated.

Japanese Patent No. 3639263

  However, the technique disclosed in Patent Document 1 has a problem that it is technically slightly complicated and costly, such as dividing and controlling a heating coil to excite high-frequency vibration.

  This invention is for solving the said subject, and it aims at obtaining the rice cooker which suppresses dripping the water droplet which condensed on the inner lid | cover to rice without being technically simple and costly. To do.

  A rice cooker according to the present invention includes a main body that houses an inner pot, a lid that is hinged to the main body and covers an upper opening of the main body, a heating unit that heats the inner pot, and the lid body A rice cooker provided with an inner lid attached to the inner pot side, wherein the inner lid is formed of a porous ceramic material.

  According to the rice cooker according to the present invention, by forming the inner lid with a material of porous ceramics, the inner lid itself retains water droplets that condense on the inner lid during cooking and heat retention in the hole. Reduce dripping. Therefore, it is possible to suppress dripping water droplets condensed on the inner lid onto the rice without being technically simple and costly.

It is a perspective view which shows the external appearance of the rice cooker which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows schematic structure of the rice cooker which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows schematic structure of the rice cooker which concerns on Embodiment 2 of this invention.

  Below, embodiment of the rice cooker which concerns on this invention is described. In addition, the form of drawing is an example and does not limit this invention. Moreover, what attached | subjected the same code | symbol in each figure is the same, or is equivalent to this, and this is common in the whole text of a specification. Furthermore, in the following drawings, the relationship between the sizes of the constituent members may be different from the actual one.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing an appearance of rice cooker 100 according to Embodiment 1 of the present invention. FIG. 2 is an explanatory diagram showing a schematic configuration of the rice cooker 100 according to Embodiment 1 of the present invention.
As shown in FIGS. 1 and 2, the rice cooker 100 according to Embodiment 1 includes a main body 1.
An upper opening is formed in the upper part of the main body 1. The upper opening is opened and closed by a lid 2 that covers the upper opening that is axially connected to the main body 1 by a hinge 3.
The lid 2 is opened and closed by a latch 4 and a latch release button 5.

  A display portion 1a and operation buttons 1b are provided on the front surface of the main body 1 opposite to the side having the hinge 3 that is connected to the shaft.

  An inner lid 6 is detachably provided on the lower surface of the lid 2. The inner lid 6 is fixed to a fixed frame 9 to which an annular packing 8 that seals the opening of the inner hook 7 is fixed.

  A heater 11 whose surface on the inner lid 6 side is covered with a sheet metal 10 is provided between the lid body 2 and the inner lid 6. The heater 11 generates heat by resistance heating when supplied with power. The heater 11 is a linear heater placed over the lid 2. The heater 11 may be a planar heater instead of a linear heater.

On the upper side of the inner lid 6 of the lid body 2, a tooth separation case 12 for separating a tooth mixed in steam is attached. In general, the separation case 12 is provided with a guide cylinder 13 and an opening / closing valve 19 above the steam inlet hole 6a of the inner lid 6. The steam that flows in from the steam hole 14 of the guide cylinder 13 passes through the roughly separating case 12 of the lid body 2 and is discharged to the outside from the steam discharge hole 15 at the top of the lid body 2. When the heating stops and the internal pressure of the inner pot 7 decreases and the on-off valve 19 opens, the rice bowl is returned to the inner pot 7.
The rice bowl separation case 12 has a function of separating steam and rice bowl generated during rice cooking, guiding the steam to the steam discharge hole 15, and returning the rice bowl to the inner pot 7.

  The lid 2 is provided with a temperature sensor 18. The temperature sensor 18 is disposed between the heater 11 and the separation case 12.

  The rice cooker 100 includes an inner pot accommodating portion 16 serving as a coil base in the main body 1, and a bottomed cylindrical inner pot 7 into which water, rice and the like can be detachably attached to the inner pot accommodating portion 16. Be contained. The inner hook 7 is heated and cooked by an electromagnetic induction coil 17 serving as a heating means disposed around the center portion of the lower surface of the inner pot housing portion 16 and the outer peripheral corner portion.

  The inner hook 7 is formed with a flange 7a extending at the upper end in the outer diameter direction. The flange 7 a is placed on and supported by the upper end of the inner hook accommodating portion 16 when being accommodated in the inner hook accommodating portion 16. Further, when the lid 2 is closed, the inner hook 7 is sealed by pressing a packing 8 provided on the inner lid 6 side against the upper surface of the flange 7a.

Next, the inner lid 6 will be described in detail.
The inner lid 6 is formed of a porous ceramic material such as an alumina material, a zirconia material, or a SiC material. The inner lid 6 made of a porous ceramic material is an open cell body, and has numerous fine pores inside, and the material is baked and hardened at a high temperature. The fine holes formed in the inner lid 6 are connected to each other, and a small hole is opened in the wall between the holes, so that water droplets condensed on the surface of the inner lid 6 can be retained.

  The shape of the inner lid 6 is a bowl-like curved surface shape having a central portion protruding from the outer peripheral edge fixed to the lid 2 toward the lower inner hook 7 side. However, as for the shape of a part of center part of the inner cover 6, the part which has the isolation | separation case 12 and the temperature sensor 18 upwards is dented upwards. A portion of the inner lid 6 having the upper separation case 12 is a flat portion 6b having a plurality of steam inlet holes 6a. The portion of the inner lid 6 having the temperature sensor 18 at the top is generally a flat portion 6c positioned above the portion having the separation case 12 at the top so that the temperature sensor 18 can accurately detect the temperature. .

Next, an effect | action at the time of cooking with the rice cooker 100 which attached the above inner lids 6 is demonstrated.
When the inner pot 7 containing water and rice is accommodated in the main body 1 of the rice cooker 100, the lid 2 is closed, and the power switch provided on the operation button 1b is turned on, the inner pot 7 is moved by the action of the electromagnetic induction coil 17. Heated. When the water in the inner pot 7 boils, steam containing a rice bowl is generated. At this time, since the internal pressure of the inner pot 7 is increased, the on-off valve 19 of the separation case 12 is pushed up to close the return hole. The hole 14 is guided into the separation case 12 through the guide tube 13. The rice separation case 12 separates steam and rice balls generated during rice cooking, and guides the steam to the steam discharge hole 15. When the heating is stopped and the internal pressure of the inner hook 7 is lowered, the on-off valve 19 is lowered and opened due to its own weight and the weight of the rice bowl, and the rice bowl is returned to the inner kettle 7.

  On the other hand, when the steam in the inner pot 7 condenses on the inner lid 6, the condensed water droplets permeate into the holes of the inner lid 6 itself made of a porous ceramic material, and the water is retained to suppress dripping onto the rice. The inner lid 6 has a curved surface that is convex toward the inner hook 7 on the center side, thereby increasing the surface area and improving the water retention ability of the inner lid 6 itself to retain water in the hole.

Next, an effect | action at the time of heat-retaining with the rice cooker 100 which attached the above inner lids 6 is demonstrated.
During the heat insulation, the humidity in the inner pot 7 decreases. At this time, since the inner lid 6 retains water in the hole of the inner lid 6 itself formed of a porous ceramic material during rice cooking, the inner lid 6 retains water in the hole of the inner lid 6 when heated by the heater 11. Release the water that is. And drying of the heat-retaining rice can be suppressed.

Embodiment 2. FIG.
In the second embodiment, a plurality of recesses 20 are formed on the surface of the inner lid 6 on the inner hook 7 side. Since the other configuration is the same as that of the first embodiment, only the characteristic part will be described.

FIG. 3 is an explanatory diagram showing a schematic configuration of the rice cooker 100 according to Embodiment 2 of the present invention.
A plurality of recesses 20 are formed on the surface of the inner lid 6 on the inner hook 7 side. Further, on the surface of the inner lid 6 on the lid body 2 side, a plurality of recesses 20 are recessed with respect to the lower side of the inner lid 7 without changing the thickness of the inner lid 6, while the inner lid 6 side is on the lid body 2 side. The bottom portion 20a of the recess 20 protrudes from the surface. Further, the linear heater 11 laid over the lid 2 is located above the bottom portion 20a. For this reason, the recess 20 is formed on the surface on the lid 2 side so that the bottom 20a is closer to the heater 11 than the portion where the recess 20 is not formed. The plurality of recesses 20 are arranged along the heater 11. For this reason, the bottom portions 20 a of the plurality of recesses 20 are along the heater 11 in a state of being close to the heater 11.

  In the second embodiment, a plurality of concave portions 20 are formed on the surface of the inner lid 6 on the inner hook 7 side, so that the center side has a curved surface shape that is convex toward the inner hook 7 side. The inner cap 6 itself has improved water retention capability that can retain water in the hole. Further, when a part of the inner lid 6 is close to the heater 11 and the humidity in the inner pot 7 is lowered during the heat retention, the inner lid 6 itself tends to release the water retained in the hole.

  According to the first and second embodiments described above, since the inner lid 6 is formed of a porous ceramic material, the inner lid 6 itself has pores that cause water droplets to condense on the inner lid 6 during rice cooking and heat retention. It soaks in the water and keeps it in water, preventing dripping on the rice, and does not impair the taste. Further, when the humidity in the inner pot 7 is lowered during the heat retention, the inner lid 6 itself releases the water retained in the hole, thereby suppressing the drying of the rice. Therefore, it is a technically simple and cost-effective configuration in which the inner lid 6 is formed of a porous ceramic material, and it is possible to suppress dripping water droplets condensed on the inner lid 6 onto the rice, It can suppress the drying of rice.

  In addition, porous ceramics have a disadvantage that they are warped by firing, for example, and have a large variation in shape and are not stable. Specifically, the direction in which flat porous ceramics are warped by firing is not a fixed direction, and the shape is varied by warping on either the front or back side. However, the shape of the inner lid 6 of the rice cooker 100 according to the first and second embodiments is a curved surface that is convex on the center side toward the lower inner pot 7 side, so that the warping during firing is the original shape. Reflected, warping is allowed only in a certain direction in which the center side is convex toward the lower inner hook 7 side, and the variation in shape can be stabilized with little variation.

  In addition, the shape of the inner lid 6 is a curved surface that is convex toward the inner hook 7 on the center side, thereby increasing the surface area and improving the water retention capability of the inner lid 6 itself to retain water in the hole. Yes. Further, the inner lid 6 has a curved surface that is convex toward the lower inner hook 7 on the center side. It is possible to eliminate the point that the hook 7 protrudes at an acute angle and is easily damaged, and the inner lid 6 is hard to be damaged and the durability for use is improved.

  A plurality of recesses 20 are formed on the surface of the inner lid 6 on the inner hook 7 side. By forming the recess 20, the surface area of the inner lid 6 is increased, and the water retaining ability that the inner lid 6 itself can retain in the hole is improved.

  The plurality of recesses 20 formed on the inner lid 7 surface of the inner lid 6 are formed so as to protrude from the surface of the inner lid 6 on the lid 2 side so that the bottom 20a of the recess 20 is close to the heater 11. . By forming the recess 20 in this way, a part of the inner lid 6 is close to the heater 11, and the inner lid 6 itself that is keeping warm actively and effectively releases the water retained in the hole. Can be done efficiently.

  The heater 11 and the plurality of recesses 20 are disposed along each other. By arranging the heater 11 and the plurality of recesses 20 in this way, a part of the inner lid 6 is close to the heater 11, and the water that is retained in the hole by the inner lid 6 itself being kept warm is retained in the hole. The action of release can be performed more actively and efficiently.

  In the above embodiment, a plurality of groove-shaped recesses 20 are formed on the surface of the inner lid 6 on the inner hook 7 side so as to be along the heater 11. However, the shape of the recess and the number of recesses are not limited to this. For example, a plurality of circular recesses may be formed intermittently along the heater on the inner lid surface of the inner lid, or one groove-like recess may be formed along the heater. May be. Moreover, you may provide a recessed part without making it adjoin to a heater in order to increase the surface area of an inner cover. Furthermore, for the purpose of increasing the surface area of the inner lid, the same object can be achieved by providing a convex portion that protrudes from the surface of the inner lid of the inner lid instead of the concave portion.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Main body, 1a Display part, 1b Operation button, 2 Cover body, 3 Hinge, 4 Latch, 5 Latch release button, 6 Inner lid, 6a Steam inlet, 6b Flat part, 6c Flat part, 7 Inner hook, 7a Flange, 8 Packing, 9 Fixed frame, 10 Sheet metal, 11 Heater, 12 Large separation case, 13 Guide tube, 14 Steam hole, 15 Steam discharge hole, 16 Inner hook housing part, 17 Electromagnetic induction coil, 18 Temperature sensor, 19 Open / close valve , 20 recess, 20a bottom, 100 rice cooker.

Claims (5)

A main body that houses the inner hook, a lid that is hinged to the main body and covers the upper opening of the main body, a heating means that heats the inner hook, and an inner body attached to the inner hook side of the lid A rice cooker comprising a lid,
The inner lid is a rice cooker formed of a porous ceramic material.   The rice cooker according to claim 1, wherein the shape of the inner lid is a curved shape that is convex toward the inner pot side.   The rice cooker according to claim 1 or 2, wherein a concave portion is formed on a surface of the inner lid on the inner pot side. A heater is provided between the lid and the inner lid,
The rice cooker according to claim 3, wherein the inner lid is formed so as to protrude from a surface of the inner lid on the lid side so that a bottom portion of the recess is close to the heater.   The rice cooker according to claim 3 or 4, wherein the heater and the concave portion are arranged so as to be along each other.

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