WO2012153444A1 - 炊飯器および炊飯器用鍋 - Google Patents

炊飯器および炊飯器用鍋 Download PDF

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Publication number
WO2012153444A1
WO2012153444A1 PCT/JP2012/000523 JP2012000523W WO2012153444A1 WO 2012153444 A1 WO2012153444 A1 WO 2012153444A1 JP 2012000523 W JP2012000523 W JP 2012000523W WO 2012153444 A1 WO2012153444 A1 WO 2012153444A1
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WO
WIPO (PCT)
Prior art keywords
inner pot
rice cooker
pan
rice
pot body
Prior art date
Application number
PCT/JP2012/000523
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English (en)
French (fr)
Japanese (ja)
Inventor
重岡　武彦
新田　浩朗
片岡　章
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to CN201280022362.XA priority Critical patent/CN103517657B/zh
Priority to JP2013513901A priority patent/JPWO2012153444A1/ja
Publication of WO2012153444A1 publication Critical patent/WO2012153444A1/ja

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/004—Cooking-vessels with integral electrical heating means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels

Definitions

  • the present invention relates to a rice cooker that performs a rice cooking operation by heating by electromagnetic induction, and a rice cooker pan that is detachably stored in a rice cooker body of the rice cooker.
  • FIG. 7 is a cross-sectional view showing the inner pot 1 and induction coil 3 of the conventional rice cooker described in Patent Document 1.
  • an inner pot 1 in which a flange 2 protruding outward is formed at the upper end opening is detachably provided.
  • the inner pot 1 has a heat conductive layer 1a formed of aluminum die casting, and a heat generating layer 1b formed of a ferritic stainless steel as a magnetic metal material on the outer surface of the heat conductive layer 1a is outsert simultaneously with the heat conductive layer 1a. It is formed by processing. Further, a fluorine coating 1c is applied to the inner surface of the heat conductive layer 1a.
  • the heat generating layer 1b made of a magnetic metal material is outsert processed by the aluminum die casting that is the heat conductive layer 1a to form the inner pot. For this reason, it is not necessary to use the clad material comprised by bonding different metals as a material of the inner pot 1. Therefore, the configuration of the inner pot 1 eliminates the need for a large-scale facility for producing the clad material, is excellent in workability, and can reduce the manufacturing cost.
  • the heat conductive layer 1a is formed by aluminum die casting, the thickness of the heat conductive layer 1a can be freely set.
  • the inner pot 1 of the rice cooker configured as described above can increase only the thickness near the induction coil 3, and can improve the rice cooking performance while minimizing the increase in the inner pot weight. It is a configuration.
  • a ferromagnetic metal plate is integrally formed on the outer flat portion of the bottom of the container body by a pressurizing operation with a pressurizing unit on the container body formed of a nonmagnetic metal material.
  • FIG. 8 is a longitudinal sectional view of a pan for an induction heating cooker described in Patent Document 2, and schematically shows a pan on which a ferromagnetic metal plate is superimposed.
  • FIG. 9 is a longitudinal sectional view showing the shape of the ferromagnetic metal plate described in Patent Document 2 before press-fitting.
  • the container body 12 made of the base material 11 made of a nonmagnetic metal material has a ferromagnetic metal plate 14 superimposed on an outer flat portion 13 at the bottom of the pan.
  • the ferromagnetic metal plate 14 is integrally coupled to the outer flat portion 13 at the bottom of the pan by pressure processing.
  • the ferromagnetic metal plate 14 has a plurality of openings 17, and has a bent portion 16 that is bent with the opening edge 15 of the opening 17 facing toward the outer flat portion 13 side of the pan bottom. is doing.
  • the ferromagnetic metal plate 14 has rigidity and is pressed in a posture in which the bent portion 16 is directed toward the outer flat surface portion 13 at the bottom of the pan.
  • the inner flat surface portion 18 of the pot bottom portion corresponds to the bent portion 16 of the ferromagnetic metal plate 14.
  • a compression mark portion 19 is formed at the position.
  • the cooking pot described in Patent Document 2 is configured to be easy to use as a cooking container using aluminum as a material.
  • a pattern is formed on the inner flat surface portion 18 of the cooking container, and the interior surface of the cooking container is given an aesthetic appearance, and when the cooking container is used for cooking using an electromagnetic cooker. This is a configuration capable of causing a change in the boiling state.
  • the inner pot 1 has the heat conduction layer 1a made of aluminum formed by aluminum die casting, and the heat generation layer 1b is formed by outsert processing of the magnetic material.
  • the heat conduction layer 1a made of aluminum formed by aluminum die casting
  • the heat generation layer 1b is formed by outsert processing of the magnetic material.
  • a mold release treatment such as a fluorine coating may be generally performed in order to prevent sticking of a cooked product or to improve cleaning properties.
  • the surface pattern of the compression mark portion 19 may disappear due to mold release treatment such as fluorine coating, or it may be blurred, and the heat conduction to the rice in the boiling state when cooking rice is sufficient There was a concern that it would not be demonstrated.
  • the present invention solves the problems in the prior art, and securely fixes the inner pan magnetic plate made of magnetic metal to the bottom of the inner pan body made of aluminum, and the bottom of the inner pan body
  • An object of the present invention is to provide an inexpensive rice cooker pan having high rice cooking performance and a rice cooker using the same by forming a plurality of concave portions having a predetermined shape in a predetermined region on the inner surface of the rice cooker.
  • the rice cooker pan of the present invention has a rice cooker body, A rice cooker pot detachably stored in the rice cooker body; An induction coil that is located below the rice cooker pan and heats the rice cooker pan by electromagnetic induction, A controller for controlling the induction coil, and a rice cooker pan used in a rice cooker comprising:
  • the rice cooker pan has an inner pot body made of aluminum, and an inner pot magnetic plate made of magnetic metal disposed on the outer surface of the bottom of the inner pot body,
  • the inner pot body has a plurality of recesses disposed on the inner surface of the bottom of the inner pot body, and a plurality of protrusions disposed on the outer surface of the bottom of the inner pot body, the recess
  • the convex part is integrally formed
  • the inner pot magnetic plate has a plurality of opening-shaped locking portions having an outer edge portion protruding toward the bottom of the inner pot body corresponding to the convex portion,
  • the rice cooker pan is configured by pressing the convex portion and the
  • the inner pot which is a rice cooker pan according to the present invention configured as described above
  • a plurality of recesses are disposed on the inner surface of the bottom of the inner pot body, and a plurality of protrusions are formed on the outer surface of the bottom of the inner pot body.
  • the parts are arranged and formed integrally at the same time.
  • the inner pan body can be formed by one-time processing, and the concave portions are formed when heated during rice cooking by appropriately arranging the shape and position of a plurality of concave portions formed on the inner surface of the bottom portion of the inner pot main body. It is configured to be the starting point of boiling.
  • the rice cooker using the rice cooker pan according to the present invention Since it is configured in this manner, in the rice cooker using the rice cooker pan according to the present invention, the position of the crab hole (the hole on the surface of the rice that is produced when the rice is cooked), which is the path of water vapor during cooking, The position of the convection generated inside the cooking pot becomes constant, and stable rice cooking performance can be obtained.
  • the rice grains can be prevented from slipping at the time of washing the rice so that the rice can be sharpened easily, and the outflow of the rice grains at the time of draining at the time of washing the rice can be suppressed.
  • the rice cooker using the rice cooker pan according to the present invention has a configuration capable of suppressing the stickiness of rice during the heat insulation.
  • the convex portion of the inner pan body and the locking portion of the inner pan magnetic plate are combined and crimped, and the inner pan magnetic plate is fixed to the inner pan body to constitute the pan. Therefore, the rice cooker pan capable of performing electromagnetic induction heating and cooking is lightweight and easy to handle, has excellent processability, and can be configured at a low manufacturing cost.
  • a rice cooker pan and a rice cooker can be provided. Furthermore, according to the present invention, it is possible to easily manufacture a rice cooker pan by combining the convex portion of the inner pan body and the locking portion of the inner pan magnetic plate, and excellent in workability. It is possible to provide a rice cooker pot and a rice cooker that can greatly reduce the manufacturing cost.
  • Sectional drawing which shows the rice cooker provided with the pan for rice cookers of Embodiment 1 which concerns on this invention.
  • An enlarged cross-sectional view (A) The top view which shows the inner pot magnetic plate in the pot for rice cookers in Embodiment 1, (b) The longitudinal cross-sectional view of an inner pot magnetic plate, (c) Sectional drawing which expanded the principal part of the inner pot magnetic plate (A) Process figure at the time of assembly pressure bonding of the rice cooker pot in Embodiment 1, (b) Sectional drawing which expanded the principal part of the rice cooker pot of Embodiment 1 which was assembled and pressure-bonded.
  • Sectional drawing which shows the inner pot and induction coil of the conventional rice cooker
  • a longitudinal sectional view schematically showing a pan on which a conventional ferromagnetic metal plate is superimposed.
  • a longitudinal sectional view showing the shape of a conventional ferromagnetic metal plate before press-fitting
  • the rice cooker pan includes a rice cooker body, A rice cooker pot detachably stored in the rice cooker body; An induction coil that is located below the rice cooker pan and heats the rice cooker pan by electromagnetic induction, A controller for controlling the induction coil, and a rice cooker pan used in a rice cooker comprising:
  • the inner pot which is the rice cooker pot has an inner pot body made of aluminum and an inner pot magnetic plate made of magnetic metal disposed on the outer surface of the bottom of the inner pot body,
  • the inner pot body has a plurality of recesses disposed on the inner surface of the bottom of the inner pot body, and a plurality of protrusions disposed on the outer surface of the bottom of the inner pot body, the recess
  • the convex part is integrally formed
  • the inner pot magnetic plate has a plurality of opening-shaped locking portions having an outer edge portion protruding toward the bottom of the inner pot body corresponding to the convex portion,
  • the rice cooker pan is configured by placing
  • a plurality of concave portions are disposed on the inner surface of the bottom portion of the inner pot body, and a plurality of convex portions are disposed on the outer surface of the bottom portion of the inner pot body. Since it is provided and integrally formed at the same time, the concave portion and the convex portion of the inner pot main body can be formed by one processing.
  • the recesses become the starting point of boiling when heated during cooking, so when cooking
  • the position of the crab hole (the hole on the surface of the rice that is generated when cooking), the position of the convection that occurs inside the inner pot, and the like are constant, and stable rice cooking performance can be obtained.
  • the rice cooker pan of the first aspect it is possible to suppress the slipping of the rice grains at the time of washing the rice and make it easy to sharpen, and to suppress the outflow of the rice grains at the time of draining at the time of washing the rice.
  • the stickiness of the rice at the time of heat insulation can be suppressed.
  • a pot capable of performing electromagnetic induction heating and cooking can be configured to be lightweight, easy to handle, excellent in workability, and low in manufacturing cost.
  • the inner pot which is the pan for rice cookers of the 1st mode concerning the present invention
  • the convex part of the inner pot main body and the locking part of the inner pot magnetic plate it is applied to the inner pot magnetic plate.
  • the burr generated when opening the provided locking part pierces the bottom surface of the inner pot body, and the protruding part of the inner pot body on the sag portion (curved surface part) formed on the opposite side of the burr generated on the locking part
  • the parts are crushed and engaged, and spread over the entire opening of the locking part of the inner pot magnetic plate.
  • a part of the crushed convex part of the inner pot body is caught on the outer edge part of the locking part of the inner pot magnetic plate, and the convex part of the inner pot body works like a rivet,
  • the magnetic plate is firmly fixed.
  • the pan for the rice cooker of the second aspect according to the present invention has an outer edge portion in which the locking portion of the inner pot magnetic plate of the first aspect protrudes toward the bottom of the inner pot body, It may be a substantially burring-shaped opening that gradually decreases toward the bottom of the inner pot body.
  • the outer edge portion of the locking portion of the inner pot magnetic plate protrudes toward the bottom of the inner pot body, and the opening of the locking portion is the inner pot body. It is a substantially burring shape that gradually decreases toward the bottom. For this reason, when the convex part of the inner pot body and the locking part of the inner pot magnetic plate are combined and crimped, the convex part of the inner pot body fits into the substantially burring-shaped locking part of the inner pot magnetic plate, While closing the opening of the burring-shaped locking part, the outer edge part of the substantially burring-shaped locking part of the inner pot magnetic plate is harder to the inner pot body, and more firmly fix the inner pot magnetic plate to the inner pot body it can.
  • the rice cooker pan according to the third aspect of the present invention may be configured such that the outer diameter of the inner pot magnetic plate in the second aspect is located inside the bottom projection surface of the inner pot body. .
  • the outer diameter of the inner pot magnetic plate is located on the inner side than the bottom projection surface of the inner pot body,
  • the bottom part of the inner pot main body comprised with the aluminum located in the outer side can demonstrate the interfering effect, and can prevent the leakage magnetic flux which arises from the induction coil of a rice cooker.
  • the rice cooker pan according to the fourth aspect of the present invention in particular, the position of the plurality of recesses disposed on the inner surface of the bottom of the inner pot body in any one of the first to third aspects, You may arrange
  • the portion where the plurality of recesses disposed on the inner surface of the bottom portion of the inner pan body are formed is thin, and the inner pan magnetic plate Since it is not located in the opening of the locking part, it becomes the structure which is easy to receive the heat of the inner pot magnetic plate heated with the induction coil of a rice cooker.
  • the plurality of recesses arranged on the inner surface of the bottom of the inner pot body has a higher temperature than the other parts, and the bubbles in the recesses that become the starting point of boiling when heated during cooking are stronger (more, more frequently ) It becomes the structure which produces
  • the rice cooker pan of the fifth aspect according to the present invention in particular, the position of the plurality of recesses disposed on the inner surface of the bottom of the inner pot body in any one of the first to third aspects, You may arrange
  • the shape of the concave portion and the convex portion can be formed in a single processing step, and also when the inner pan body is a thin material. Can respond.
  • the thickness of the inner pot body in the rice cooker pan is more than a certain level, even if a concave or convex portion is formed on one surface, no major deformation is caused on the other opposite surface.
  • the inner pot body is made of a thin material, if a concave or convex portion is formed on one surface, a convex or concave portion having substantially the same shape is formed on the opposite side of the other surface. .
  • a plurality of convex portions are formed on the outer surface of the bottom portion of the inner pot body between the plurality of concave portions disposed on the inner surface of the bottom portion of the inner pot body, a plurality of concave portions on the inner surface and a plurality of outer surfaces are formed.
  • the convex portions interfere with each other, and there are restrictions on the arrangement and number of concave portions or convex portions.
  • the convex portion can be formed at the same time when the concave portion is formed.
  • the rice cooker of the 6th aspect which concerns on this invention uses the pot for rice cookers of any one of the 1st thru
  • or 5th aspect It is effective and can provide an inexpensive rice cooker with high rice cooking performance.
  • FIG. 1 is a cross-sectional view showing a rice cooker according to Embodiment 1 of the present invention.
  • the rice cooker which accommodated the inner pot which is a pan for rice cookers directly removable with respect to the rice cooker main body is shown.
  • 2A is a plan view showing the inner pot body 25 in the inner pot 22 which is the pot for the rice cooker shown in FIG. 1
  • FIG. 2B is a longitudinal sectional view of the inner pot body 25.
  • 2 (c) is a bottom view of the inner pot body 25, and
  • FIG. 2 (d) is an enlarged cross-sectional view of the main part of the inner pot body 25.
  • 3 (a) is a plan view showing the inner pot magnetic plate 26 embedded in the bottom surface of the inner pot body 25, and FIG.
  • FIG. 4A is an explanatory diagram when assembling and crimping the inner pot 22 which is the rice cooker pot in the first embodiment, and FIG. It is sectional drawing.
  • the rice cooker body 21 has an open upper surface, and an inner pot 22 that is a rice cooker pot is detachably accommodated in a protective frame 23 disposed inside the rice cooker body 21. It is configured. Below the inner pot 22, an induction coil 24, which is a heating unit, is provided outside the protective frame 23. The inner pot 22 containing rice and water is heated by the induction coil 24 so that rice is cooked.
  • the inner pot 22 which is a pot for a rice cooker includes an inner pot body 25 formed of aluminum shown in FIGS. 2 (a) to (d) and a magnetic metal such as stainless steel shown in FIGS. 3 (a) to (c). It is comprised with the inner-pan magnetic plate 26 comprised by these.
  • the outer surface of the bottom portion of the inner pot body 25 has an outer diameter smaller than that of the bottom projection surface of the inner pot 22 and is located inside the outer periphery of the bottom portion of the inner pot body 25.
  • a pan magnetic plate 26 is embedded.
  • a plurality of recesses 27 are disposed on the inner surface of the bottom of the inner pot body 25 with a predetermined interval in a predetermined region.
  • a plurality of convex portions 28 are arranged on the outer surface of the bottom portion of the inner pot main body 25 with a predetermined interval in a predetermined region.
  • the inner pot magnetic plate 26 is provided with a plurality of locking portions 29 that are open at positions corresponding to the convex portions 28 of the inner pot body 25.
  • the outer edge portion of the opening of each locking part 29 of the inner pot magnetic plate 26 protrudes toward the bottom of the inner pot body 25, and the opening of the locking part 29 gradually decreases toward the bottom of the inner pot body 25. It has a burring shape. Therefore, in the outer edge part of the opening of each locking part 29, the edge part of the direction opposite to the direction which goes to the bottom part of the inner pot main body 25 is formed in the substantially curved surface (sag shape).
  • the inner pot main body 25 and the inner pot magnetic plate 26 configured as described above are connected to the convex portion 28 of the inner pot main body 25 and the inner pot magnetic plate 26 as shown in FIGS.
  • the stoppers 29 are combined and crimped, and the inner pot magnetic plate 26 is fixed to the inner pot body 25.
  • positioned at the inner surface and outer surface of the bottom part of the inner pot main body 25 are arrange
  • positions the recessed part 27 and the convex part 28 is formed alternately so that the position of the up-down direction (thickness direction) of the recessed part 27 and the convex part 28 may not overlap.
  • the concentric circle of the convex part 28 is arrange
  • the plurality of concave portions 27 disposed on the inner surface of the bottom portion of the inner pot body 25 in the rice cooker of Embodiment 1 are the plurality of convex portions 28 disposed on the outer surface of the bottom portion of the inner pot body 25. And the position in the vertical direction (thickness direction) do not overlap.
  • a lid 30 is provided on the upper portion of the rice cooker main body 21 so as to be rotatable so as to cover the upper surface opening of the rice cooker main body 21.
  • a heating plate 32 having an inner pot packing 31 is attached to the inner surface side of the lid 30.
  • the lid 30 is provided with a heating plate heating unit 35 for induction heating the heating plate 32.
  • the heating plate heating unit 35 is constituted by an induction coil.
  • a heating plate temperature detection unit 36 that detects the temperature of the heating plate 32 is provided.
  • an inner pot temperature detection unit 33 which is an inner pot temperature detecting means for detecting the temperature of the inner pot 22 is provided at the lower part of the rice cooker body 21.
  • Such information is input to the control unit 34.
  • the control unit 34 is constituted by a microcomputer mounted on a circuit board.
  • the control unit 34 controls the induction coil 24, which is a heating unit, in a predetermined sequence based on various input information, whereby the rice cooking process in the rice cooker is performed.
  • the user puts rice to be cooked and water corresponding to the amount of rice into the inner pot 22 and mounts the inner pot 22 in the rice cooker main body 21. And a user sets desired rice cooking operation
  • the rice cooking process is roughly divided into a pre-cooking process, a cooking process, a boiling maintenance process, and a steaming process in time order.
  • the induction coil 24 which is a heating unit is controlled so that the temperature of the inner pot 22 becomes a temperature suitable for water absorption of rice (50 ° C.), and the rice and water in the inner pot 22 are Heat.
  • the induction coil 24 that is a heating unit is controlled to heat the inner pot 22 with a predetermined amount of heat.
  • the amount of cooked rice is determined based on the temperature rise rate at this time.
  • the induction coil 24 and the heating plate heating unit 35 which are heating units, are energized until the water in the inner pan 22 runs out and the temperature of the inner pan 22 reaches a predetermined value that exceeds 100 ° C. Heat rice and water.
  • the heating (cooking) by the induction coil 24 and the heating plate heating unit 35 and the stop (pause) of heating are repeated a plurality of times during a certain time according to the amount of rice cooking.
  • the temperature of the water in the inner pot 22 suddenly rises from 50 ° C. to 100 ° C. by continuous energization of the induction coil 24 as a heating unit.
  • the water in the inner pot 22 changes from an initial non-boiling natural convection state (first stage) to a nucleate boiling state (second stage) in which bubbles generated on the inner surface of the inner pot 22 gradually do not reach the water surface.
  • a nucleate boiling state (third stage) in which bubbles generated on the inner surface of the inner pot 22 reach the water surface occurs.
  • the inner pot 22 is heated by the induction coil 24.
  • the inner surface of the inner pot 22 generates heat due to heat transfer, and the water in the inner pot 22 in contact with the inner surface of the inner pot 22 is locally heated.
  • a density difference occurs in the water in the inner pot 22.
  • local buoyancy is generated, and a flow is induced in the water in the inner pot 22.
  • Such local non-uniform density causes unboiled natural convection in the water in the inner pot 22.
  • the heat transfer from water to rice at this time is natural convection heat transfer.
  • the “second stage” where the bubbles generated on the inner surface of the inner pot 22 do not reach the water surface, as the superheat degree ⁇ Tsat becomes larger, fine bubbles are generated on the inner surface of the inner pot 22 and detached. Nucleate boiling will occur. In the initial nucleate boiling state, the amount of heat that the fine bubbles have is not sufficient, and as the temperature rises toward the water surface, the temperature of the bubbles approaches the water temperature and recondenses. As a result, the bubbles liquefy and disappear. Thus, the “second stage” is a nucleate boiling state where bubbles do not reach the water surface. The heat transfer from water to rice at this time is natural convection heat transfer and boiling heat transfer.
  • the generation point of the bubble becomes dense as the Joule heat generation Q by the induction coil 24 increases.
  • the air bubbles frequently come off from the inner surface of the inner pot 22 and the released air bubbles reach the water surface, so that the entire water in the inner pot 22 is vigorously stirred.
  • the water in the inner pot 22 is in a complete nucleate boiling state. The heat transfer from water to rice at this time is boiling heat transfer.
  • the heat conduction from the water to the rice is based on the case where the natural convection heat transfer is dominant and the boiling heat transfer depending on how bubbles are generated on the surface of the inner pot 22. Is divided into the case where becomes dominant. That is, the former is a case where bubbles grow large on the inner surface of the inner pot 22, and since most of the Joule heat generation Q is spent on the growth of bubbles, heat transfer from water to the rice is from the inner surface of the inner pot 22. Heat transfer to the water in the inner pot 22 and heat transfer from the bubbles to the water, both of which transfer heat to the rice by natural convection heat transfer.
  • the latter is a case where bubbles are easily detached from the inner surface of the inner pot 22, and as described above, the bubbles are fine and the bubbles rise toward the water surface by buoyancy, but the bubbles have. Since the amount of heat is not enough, as the temperature rises, the temperature of the bubbles approaches the water temperature and recondenses, resulting in liquefaction and the bubbles disappear. However, the bubbles frequently rise toward the water surface, so that forced convection occurs in the water in the inner pot 22, and heat is transferred to the rice by boiling heat transfer and forced convection heat transfer. In forced convection heat transfer, natural heat transfer is more uniform than in natural convection heat transfer, so uniform heat transfer to rice can be achieved. Therefore, the rice can be uniformly heated by making the inner surface of the inner pot 22 into a surface state in which bubbles are easily separated.
  • the rice In the “third stage” state, the bubbles frequently leave the inner surface of the inner pot 22 and reach the water surface, and the entire water in the inner pot 22 is vigorously stirred.
  • the rice is not always heated uniformly in boiling heat transfer due to the generation of bubbles on the inner surface of the inner pot 22. That is, when the bubbles are easily separated from the inner surface of the inner pot 22, the opportunity for contact between the bubbles and the rice is increased as compared with the case where the bubbles grow larger, thereby providing an opportunity for heat transfer to the rice. Increase. Therefore, the rice can be uniformly heated by making the inner surface of the inner pot 22 into a surface state in which bubbles are easily separated.
  • FIG. 5 shows a bubble trapped in a conical recess with an exit radius R.
  • FIG. 5A shows a state in which the bubble boundary surface X maintains 90 ° with the side surface Y of the conical depression
  • FIG. 5B shows the state between the bubble boundary surface X and the flat surface Z of the heating surface. The contact angle is maintained at 90 °
  • (c) shows the case where the boundary surface X of the bubble has moved away from the edge around the outlet of the conical depression.
  • the curvature 1 / R of the bubble boundary surface X as the bubble grows is calculated as follows: It is in contact with the surrounding edge and takes the minimum value while maintaining 90 ° with the side surface Y of the hollow (see FIG. 5A). After that, the bubble boundary surface X is in contact with the edge around the outlet of the indentation, but the curvature 1 / R of the bubble boundary surface X until the contact angle of 90 ° with the flat surface Z of the heating surface is reached. Continues to increase (stable equilibrium).
  • the curvature 1 / R becomes the maximum value (in FIG. 5). (See (b)). After the bubble curvature 1 / R reaches its maximum value, the bubble curvature 1 / R increases as the bubble volume increases as the contact position of the bubble boundary surface X moves away from the edge around the exit of the recess. It decreases again (see FIG. 5C). Thus, as the volume of the bubble increases, the curvature 1 / R decreases, becomes unstable, and continues to grow toward the detachment of the bubble.
  • a depression may be intentionally provided in order to remove bubbles while controlling bubbles from the heating surface. Therefore, a desired bubble can be obtained by forming a plurality of recesses 27 in a predetermined region on the inner surface of the bottom of the inner pot body 25.
  • a plurality of recesses 27 become the starting point of bubbles, and by arranging the recesses 27 in appropriate positions in accordance with the shape of the inner pot 22 and the portion heated by the induction coil 24, crab holes (cooking up)
  • the position of the surface of the rice surface) and the position of the convection generated in the inner pot 22 are constant, so that stable rice cooking performance can be obtained.
  • the plurality of concave portions 27 disposed on the inner surface of the bottom portion of the inner pot main body 25 are the plurality of convex portions 28 disposed on the outer surface of the bottom portion of the inner pot main body 25. It is arranged so as not to overlap the position. For this reason, the part of the several recessed part 27 arrange
  • the concave portion 27 on the inner surface of the bottom portion of the inner pot body 25 has a structure that easily receives heat from the inner pot magnetic plate 26, so that the temperature becomes higher than the other portions, and the boiling start point when heated during cooking It is possible to generate stronger (more and more frequently) air bubbles in the concave portion 27. For this reason, in the rice cooker of Embodiment 1, the further improvement of rice cooking performance can be aimed at.
  • the plurality of concave portions 27 are formed on the inner surface of the bottom portion of the inner pot body 25 and the plurality of convex portions 28 are simultaneously formed on the outer surface of the bottom portion of the inner pot body 25, It can be formed by processing. Moreover, when the plurality of concave portions 27 are formed in an appropriate shape on the inner surface of the bottom portion of the inner pot main body 25 and the positions of the plurality of concave portions 27 are appropriately disposed, when heated during cooking, the bottom portion of the inner pot main body 25 The concave portion 27 on the inner surface of this is surely the starting point of boiling.
  • the rice cooker pan in the rice cooker of Embodiment 1 can easily sharpen by suppressing the slip of the rice grains at the time of washing the rice, and can suppress the outflow of the rice grains at the time of draining at the time of washing the rice. Furthermore, in the rice cooker according to the first embodiment, by using the rice cooker pan configured as described above, it is possible to suppress rice stickiness during heat insulation.
  • the outer edge portion of the opening of the locking portion 29 of the inner pot magnetic plate 26 protrudes toward the bottom of the inner pot body 25, and the opening of the locking portion 29 is the inner pot. It has a substantially burring shape that gradually decreases toward the bottom of the main body 25. For this reason, when the convex part 28 of the inner pot main body 25 and the opening part of the securing part 29 of the inner pot magnetic plate 26 are match
  • the rice cooker pan in Embodiment 1 can be formed by pressing the inner pan magnetic plate 26 having the substantially burring-shaped locking portion 29 on the outer surface of the bottom portion of the inner pan body 25 by pressing. This eliminates the need for large-scale production equipment such as casting equipment, and enables production at low cost using simple equipment. For this reason, the rice cooker pot in Embodiment 1 can provide an electromagnetic induction heating system pot with high heating efficiency at a low price.
  • the outer diameter of the inner pot magnetic plate 26 is set to be inside the projection surface at the bottom of the inner pot body 25. For this reason, the outer peripheral part of the bottom part of the inner pot main body 25 comprised with the aluminum which becomes the outer side from the inner pot magnetic plate 26 exhibits a magnetic interference effect, and prevents the leakage magnetic flux which arises from the induction coil 24 of a rice cooker. be able to.
  • FIG. 6 is a process diagram at the time of assembling and pressing the inner pot for a rice cooker in the rice cooker according to the second embodiment of the present invention.
  • the point different from the rice cooker of Embodiment 1 described above is the configuration of the inner pot that is a pan for the rice cooker, and the other points are the same as those of the rice cooker of Embodiment 1. is there.
  • the rice cooker according to the second embodiment since the basic configuration other than the inner pot of the rice cooker according to the first embodiment is the same, the explanation will focus on the inner pot.
  • components having the same functions and configurations as those in the rice cooker of the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and description of the first embodiment is made. Apply.
  • an inner pot 40 which is a pot for a rice cooker in the rice cooker according to the second embodiment, includes an inner pot body 41 and an inner pot magnetic plate.
  • openings that are a plurality of locking portions 43 having outer edge portions protruding toward the bottom of the inner pot body 41 are formed.
  • a plurality of recesses 44 are formed on the inner surface of the bottom of the inner pot body 41 in the inner pot 40, and a plurality of protrusions 45 are formed on the outer surface of the bottom of the inner pot body 41.
  • the concave portion 44 and the convex portion 45 formed on the bottom of the inner pot main body 41 are configured to be formed simultaneously when the inner pot main body 41 is processed.
  • the inner pot 40 in the rice cooker according to the second embodiment includes a plurality of recesses 44 disposed on the inner surface of the bottom of the inner pot body 41 and a plurality of disposed on the outer surface of the bottom of the inner pot body 41.
  • the convex portions 45 are formed so that the respective positions are opposed to each other on the inner surface and the outer surface of the inner pot main body 41, and the convex portions 45 can be formed simultaneously when the concave portions 44 are formed. For this reason, while the shape of the recessed part 44 and the convex part 45 of the inner pot main body 41 can be formed in one processing process, it is the structure which can respond also to the thing with the thin thickness of the inner pot main body 41.
  • the thickness of the inner pan body 41 is thicker than a certain level, even if the concave portion 44 or the convex portion 45 is formed on one surface, it can be formed without causing a large deformation on the opposite side of the other surface.
  • the inner pan body 41 is thin, when the concave portion 44 or the convex portion 45 is formed on one surface, the convex portion 45 or the concave portion 44 having substantially the same shape (reverse shape) is opposite to the other surface. Formed on the side.
  • the some recessed part 44 arrange
  • the concave portion 44 of the inner pot body 41 and the locking portion 43 of the inner pot magnetic plate 42 are combined and crimped, An inner pot magnetic plate 42 is fixed to the inner pot body 41.
  • the inner pot 40 capable of performing electromagnetic induction heating and cooking has a configuration that is lightweight and easy to handle, and that has excellent workability and can reduce manufacturing costs.
  • the inner pot 40 has a plurality of concave portions 44 on the inner surface of the bottom portion, and an inner pot main body 41 having a plurality of convex portions 45 on the outer surface of the bottom portion, and a substantially burring-shaped connection. And an inner pan magnetic plate 42 having an opening of the stop portion 29.
  • the convex portion 45 formed on the outer surface of the bottom portion of the inner pot main body 41 and the locking portion 43 of the inner pot magnetic plate 42 are combined to lock the convex portion 45. It is inserted into the part 43.
  • the inner pot body 41 and the inner pot magnetic plate 42 are pressure-bonded so as to crush the convex portion 45 of the inner pot body 41.
  • a burr generated during opening processing of the locking portion 43 formed on the inner pot magnetic plate 42 pierces the outer surface of the bottom portion of the inner pot main body 41.
  • a fine sag portion (curved surface portion) is generated at the outer edge portion on the opposite side of the burr generated during opening processing.
  • the convex part 45 of the inner pot main body 41 is crushed, spreads outside, and engages and presses against the sag portion (curved surface part) of the outer edge part of the locking part 43 of the inner pot magnetic plate 42. It becomes. That is, the convex part 45 of the inner pot main body 41 is crushed, and is spread and caught on the outer edge part of the locking part 43 of the inner pot magnetic plate 42. For this reason, the convex part 45 of the inner pot main body 41 works like a rivet, and the inner pot magnetic plate 42 is firmly fixed to the inner pot main body 41.
  • the plurality of recesses 27 and 44 formed on the inner surfaces of the bottom portions of the inner pot bodies 25 and 41 are formed considering the specification of the induction coil 24, the shape and thickness of the inner pots 22 and 40, and the like. And placed.
  • the plurality of recesses 27 and 44 formed on the inner surfaces of the bottoms of the inner pot bodies 25 and 41 can be used for rice that is cooked so that bubbles are uniformly generated or convection is caused by the generated bubbles.
  • the position to be arranged is set with emphasis on rice cooking performance so that heat can be transmitted uniformly.
  • the recessed part arrange
  • the rice cooking performance as a rice cooker can be improved by arrange
  • a plurality of inner pot bodies 41 are arranged on the inner surface of the bottom of the inner pot body 41. It is better to configure so that the convex portions 45 are formed at the same time when the concave portions 44 are formed by aligning the positions of the concave portions 44 and the plurality of convex portions 45 arranged on the outer surface of the bottom of the inner pot main body 41. By comprising in this way, rice cooking performance as a rice cooker and cost can be balanced.
  • the inner pot magnetic plate 26, so that the inner pot temperature detection unit 33 that detects the temperature of the inner pots 22 and 40 can reliably and accurately measure the temperature of the inner pot bodies 25 and 41 made of aluminum. 42 should have a configuration in which an opening is formed at the center corresponding to the position of the inner pot temperature detector 33.
  • the inner pots 22 and 40 should have a non-adhesive surface treatment such as coating with a fluororesin coat or a release paint so that the cooked rice is less likely to adhere.
  • a non-adhesive surface treatment such as coating with a fluororesin coat or a release paint so that the cooked rice is less likely to adhere.
  • the rice cooker pot provided in the rice cooker of the present invention it becomes possible to uniformly heat the rice, improve the taste of rice, and is useful as a rice cooker for home use or business use.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cookers (AREA)
PCT/JP2012/000523 2011-05-10 2012-01-27 炊飯器および炊飯器用鍋 WO2012153444A1 (ja)

Priority Applications (2)

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CN201280022362.XA CN103517657B (zh) 2011-05-10 2012-01-27 煮饭器和煮饭器用锅
JP2013513901A JPWO2012153444A1 (ja) 2011-05-10 2012-01-27 炊飯器および炊飯器用鍋

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JP2011-104987 2011-05-10

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CN104274061A (zh) * 2013-07-02 2015-01-14 美的集团股份有限公司 电饭煲及其内锅

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JP6775468B2 (ja) * 2017-05-22 2020-10-28 日立グローバルライフソリューションズ株式会社 炊飯器
KR20210017648A (ko) * 2019-08-09 2021-02-17 주식회사 위니아딤채 Ih 적용 당질 저감 밥솥의 제어방법

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JPH1050466A (ja) * 1996-08-02 1998-02-20 Sugiyama Kinzoku Kk 電磁調理器用鍋の製造法
JPH10165301A (ja) * 1996-12-10 1998-06-23 Toshiba Home Technol Corp 炊飯器
JP2001321269A (ja) * 2000-05-15 2001-11-20 Hiroshima Aluminum Industry Co Ltd 電磁調理用調理器具の製造方法
WO2002001991A1 (fr) * 2000-06-30 2002-01-10 Takehara Can Co., Ltd. Recipient de cuisine

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CN2891898Y (zh) * 2005-10-14 2007-04-25 松下电器产业株式会社 煮饭器
FR2915359B1 (fr) * 2007-04-27 2012-08-10 Seb Sa Article culinaire a portee peripherique et procede de fabrication
KR20090098234A (ko) * 2008-03-13 2009-09-17 주식회사 에이스티엠 뚝배기 받침

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Publication number Priority date Publication date Assignee Title
JPH1050466A (ja) * 1996-08-02 1998-02-20 Sugiyama Kinzoku Kk 電磁調理器用鍋の製造法
JPH10165301A (ja) * 1996-12-10 1998-06-23 Toshiba Home Technol Corp 炊飯器
JP2001321269A (ja) * 2000-05-15 2001-11-20 Hiroshima Aluminum Industry Co Ltd 電磁調理用調理器具の製造方法
WO2002001991A1 (fr) * 2000-06-30 2002-01-10 Takehara Can Co., Ltd. Recipient de cuisine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104274061A (zh) * 2013-07-02 2015-01-14 美的集团股份有限公司 电饭煲及其内锅
CN104274061B (zh) * 2013-07-02 2017-09-19 美的集团股份有限公司 电饭煲及其内锅

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JPWO2012153444A1 (ja) 2014-07-28
CN103517657B (zh) 2016-01-13

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