JP2015188670A - electromagnetic induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heat a division plate stored on a pot bottom by direct electromagnetic induction without using thermal conduction.SOLUTION: An electromagnetic induction heating cooker includes: a body 1; a pot-like container 7 to be extractably stored in the body 1; and a heating coil 8 disposed on the bottom in the interior of the body and inducing an eddy current in the pot-like container 7 to heat the pot-like container 7. The pot-like container 7 is composed of a carbon sintered material and extractably stores a division plate 20 composed of the carbon sintered material, at the pot bottom thereof for separating water and a heating object from each other. The division plate 20 has a plurality of ribs 23, and a plurality of communication holes 24 having a width or a diameter smaller than the grain size of the heating object, between a rib 23 and a rib 23 for communicating the back and front of the partition plate.

Description

  The present invention overcomes the stickiness of rice that has started gelatinization, generates large convection, does not cause uneven heating in the lower layer and upper layer of rice, and can achieve cooked rice without uneven cooking. It relates to a cooker.

  In a conventional electromagnetic induction heating cooker, a heating pan is composed of a clad plate. In other words, the heating pan is made by pressing a clad plate with a non-magnetic metal aluminum base material and a magnetic metal ferritic stainless steel plate on the outside into a pan shape. The structure which gave surface treatments, such as resin coating, is common.

  As an example of such an electromagnetic induction heating cooker, in order to overcome the stickiness of rice that has started gelatinization and generate large convection, the cooked rice in the pan is stirred by pressurizing and depressurizing the pan. There is a pressure rice cooker. This pressure rice cooker is a pressure having an open / close mechanism that communicates or shuts off the inside of the pan and the outside air, a pot for containing the cooked rice, a rice cooker body having an opening and heating means, a lid for closing the opening, and the outside. A valve, a pressure valve opening mechanism attached to the pressure valve, and a control unit for controlling the heating amount of the heating unit and the pressure valve opening mechanism. A control means is controlled to perform rice cooking by performing pressurization and pressure reduction alternately in a boiling maintenance process in a series of rice cooking processes.

  Further, in order to effectively generate convection, the inside diameter of the rice to be cooked, that is, a plurality of recesses or holes having a smaller width or diameter than the rice grain is formed and is detachably attached to the pan bottom. Some have a floor (hereinafter referred to as a partition plate). When the material is made of metal or sintered carbon and a recess is formed, the partition plate is attached to the bottom of the pan with the surface on which the recess is formed facing upward (for example, see Patent Document 1). .

JP 2008-167833 (Abstract, FIGS. 1 and 2)

  However, the pressure rice cooker requires a complicated mechanism and control in which the control means performs control such that the pressurization and the decompression are alternately performed in the boiling maintaining process in the series of rice cooking processes. This has a problem that it is likely to increase costs and cause defects.

  In addition, in order to effectively generate convection, the thin partition plate that is detachably attached to the bottom of the pan is not flat on the surface (upper surface) that comes in contact with the rice grains. easy. For this reason, there is a problem that the cleaning property is poor.

  Moreover, since the pan is made of a clad material, the magnetic lines of force pass through the outer stainless steel plate serving as a magnetic path. Therefore, the stainless steel plate acts as a shield, and the magnetic lines of force do not penetrate to the inside of the pan. Therefore, heat to the partition plate is transmitted by heat conduction. Therefore, there is a problem that the partition plate cannot be heated strongly unless the pot bottom and the partition plate are brought into close contact with each other and the contact area is increased.

  The present invention has been made to solve at least one of the above-described problems, and is intended to enable heating of the partition plate housed in the pan bottom directly by electromagnetic induction regardless of heat conduction. The main purpose.

  An electromagnetic induction heating cooker according to the present invention includes a main body, a pan-like container that is stored in and out of the main body, and a lower part in the main body, inducing an eddy current in the pan-like container, and this pan-like container In an electromagnetic induction heating cooker comprising a heating coil for heating the pot-shaped container, the pot-shaped container is composed of a carbon-sintered material, and the bottom of the pot-shaped container is composed of a carbon-sintered material, and water and a heated object And a partition plate is housed in such a manner that the partition plate can be inserted and removed freely. The partition plate has a plurality of ribs, and has a width or diameter smaller than the particle size of the object to be heated between the ribs. A plurality of communication holes for communicating the back and front of the partition plate are provided.

  In the electromagnetic induction heating cooker according to the present invention, the pan-like container made of the carbon sintered material is different from the metal pan made of the clad plate, and the entire magnetic field lines penetrate and penetrate, so the whole generates heat at once. Moreover, since the pot-shaped container comprised with the carbon sintering raw material permeate | transmits a magnetic force line, the partition plate accommodated in the pot bottom of the pot-shaped container can be directly heated by electromagnetic induction. Furthermore, since the partition plate is made of the same carbon sintered material as that of the pan-like container, the whole can be heated at once by electromagnetic induction together with the pan-like container. For this reason, heating efficiency improves.

It is sectional drawing of the side view which shows the whole structure of the rice cooker which is an electromagnetic induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a perspective view which shows the external appearance of the rice cooker which is an electromagnetic induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a perspective view which shows the rice cooker which is an electromagnetic induction heating cooking appliance which concerns on Embodiment 1 of this invention in the state which opened the cover body. It is a top view which shows the partition plate of the electromagnetic induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is sectional drawing of the side view of the partition plate of the electromagnetic induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the relationship between the partition plate and magnetic force line of the electromagnetic induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a top view which shows the partition plate of the electromagnetic induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a side view including the partial cross section display of the partition plate of the electromagnetic induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a top view which shows the partition plate of the electromagnetic induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is sectional drawing of the side view of the partition plate of the electromagnetic induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is sectional drawing which expands and shows the principal part of FIG. It is a top view which shows the partition plate of the electromagnetic induction heating cooking appliance which concerns on Embodiment 4 of this invention. It is a side view including the partial cross section display of the partition plate of the electromagnetic induction heating cooking appliance which concerns on Embodiment 4 of this invention.

  Hereinafter, a rice cooker will be described as an example of an electromagnetic induction heating cooker according to an embodiment of the present invention. In addition, this invention is not limited by the form of drawing shown below.

Embodiment 1. FIG.
FIG. 1 is a cross-sectional side view showing the overall configuration of a rice cooker that is an electromagnetic induction heating cooker according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing an appearance of a rice cooker that is an electromagnetic induction heating cooker according to Embodiment 1 of the present invention. FIG. 3: is a perspective view which shows the rice cooker which is an electromagnetic induction heating cooking appliance concerning Embodiment 1 of this invention in the state which opened the cover body.

  The rice cooker 100 which concerns on Embodiment 1 of this invention is equipped with the main body 1 and the cover body 5 attached to the main body 1 via the hinge mechanism part 2, as FIG. 1-3 shows. Yes. The lid 5 is opened and closed by the latch 3 and the release button 4. The rice cooker 100 includes a resin-made inner case 6 having an opening 6a at the top and a coil base fixed at the bottom in the main body 1. The inner case 6 includes a carbon sintered material. The inner pot 7 which is a pan-shaped container constituted by is accommodated in a freely removable manner. A heating coil 8 for electromagnetically heating the inner pot 7 is disposed on the outer periphery of the bottom of the coil base. In addition, a through hole is formed in the center of the bottom of the coil base, and a temperature sensor 9 for detecting the temperature of the inner hook 7 by contacting the lower surface of the inner hook 7 is installed in the through hole so as to be able to appear and retract. Yes.

  The heating coil 8 is supplied with high frequency power by a driving unit mounted on the power supply substrate 11 and electromagnetically heats the inner pot 7. That is, the drive unit converts the AC voltage from the commercial AC power source to DC once by a rectification unit (not shown), and then converts it to a high frequency by switching of the switching element, and supplies this high frequency current to the heating coil 8.

  A tank 10 storing cooling water is detachably installed at the front of the main body 1. Further, as shown in FIG. 3, the lid 5 is interposed between the inner pot 7 and the tank 10, and steam generated from an object to be heated in the inner pot 7 during cooking is stored in the tank 10. A steam conduit 13 is provided for guiding the water to the water and dissipating it in the cooling water to condense it.

  A flange 7 a is formed at the upper end of the inner hook 7, and this flange 7 a is placed and supported on the peripheral edge of the opening 6 a of the inner case 6 when stored in the inner case 6. As shown in FIG. 1, a partition plate 20 made of the same carbon sintered material as that of the inner pot 7 and coated with a fluororesin on the surface is accommodated at the bottom of the inner pot 7 so as to be freely inserted and removed. . The partition plate 20 has a function of separating water and rice to be heated and promoting convection.

FIG. 4 is a plan view showing a partition plate of the electromagnetic induction heating cooker according to Embodiment 1 of the present invention. FIG. 5 is a cross-sectional view of the partition plate of the electromagnetic induction heating cooker according to the first embodiment of the present invention as viewed from the side. FIG. 6 is a schematic diagram showing the relationship between the partition plate and the magnetic lines of force of the electromagnetic induction heating cooker according to Embodiment 1 of the present invention.
As shown in FIGS. 1 and 4 to 6, the partition plate 20 has a flat upper surface 21 and a plurality of ribs 23 formed concentrically on the lower surface 22, and the bottom of the inner pot 7. Protrusively toward. That is, the partition plate 20 is placed on the pot bottom of the inner pot 7 with the rib 23 side down, and a narrow space g is formed between the partition plate 20 and the pot bottom using the ribs 23 as spacers. Has been. The ribs 23 of the partition plate 20 are disposed so as to face the heating coil 8.

  The partition plate 20 has a plurality of communication holes between the ribs 23 and the ribs 23, each having a particle size of an object to be heated, that is, a width or diameter smaller than that of rice grains, and communicating the back of the partition plate 20 with the front surface. 24 is provided. As shown in FIG. 6, the communication hole 24 has a constriction (orifice) 25 formed in an intermediate portion thereof, and the upper portion 26 following the constriction has a shape whose diameter increases toward the upper side. This makes it easier for the bubbles to grow larger during boiling, and the generated bubbles can be ejected vigorously upward. In addition, the pressure at the time of boiling increases, so that the diameter of the constriction 25 is small.

Next, operation | movement of the rice cooker 100 which concerns on Embodiment 1 of this invention is demonstrated based on FIGS.
When an instruction to start heating such as a rice cooking instruction based on settings from the operation unit is made by the user, the control unit starts control of the drive unit. The drive unit converts the AC voltage from the commercial AC power source into DC once by the rectification unit, and then converts the AC voltage to high frequency by switching of the switching element, and this high frequency current is supplied to the heating coil 8. When a high-frequency current flows through the heating coil 8, an alternating magnetic field is generated from the heating coil 8, whereby a magnetic flux is applied to the inner hook 7. Thereby, an eddy current is generated in the inner pot 7, Joule heat is generated by the eddy current and the electric resistance of the inner pot 7, the inner pot 7 is heated, and rice cooking is performed.

  In the rice cooker 100 according to the first embodiment of the present invention, as described above, the inner pot 7 and the partition plate 20 housed in the bottom of the pot are both made of a carbon sintered material. The inner pot 7 made of a carbon sintered material, unlike a metal pan made of a clad plate, penetrates and penetrates the magnetic field lines (the magnetic field line has a characteristic that it can penetrate about 10 mm from the surface of the carbon sintered material). . Therefore, the partition plate 20 housed in the pot bottom of the inner pot 7 can also be directly heated by electromagnetic induction, and both the inner pot 7 and the partition plate 20 can be heated at once by electromagnetic induction. Furthermore, since the partition plate is made of the same carbon sintered material as that of the inner pot 7, the whole can be heated at once by electromagnetic induction together with the pan-like container. For this reason, heating efficiency improves.

Moreover, since the rib 23 of the partition plate 20 is formed so as to protrude toward the bottom of the inner pot 7, it is easy to secure a water layer.
Moreover, since the upper surface 21 of the partition plate 20 is formed flat, it is easy to pour rice, it is difficult to attach rice, and it is easy to clean.

  Further, since the ribs 23 of the partition plate 20 are arranged so as to substantially face the heating coil 8 and intersect the magnetic field lines A, the magnetic field lines A can be concentrated and transmitted through the ribs as shown in FIG. For this reason, the number of heat generation points increases, so that heat can be effectively transferred to water, and the heating efficiency is improved. Then, when bubbles are formed, the pressure of the steam rises, and higher-pressure steam can be jetted out, and even gelatinized rice can be stirred.

  The partition plate 20 is placed on the bottom of the inner pot 7 with the rib 23 side down, and the rib 23 serves as a spacer between the partition plate 20 and the bottom of the inner pot 7 so that the space is narrow. g is formed. For this reason, water can be quickly boiled by the rib 23 heated by electromagnetic induction by the heating coil 8 by storing water in the narrow space g. And since the pressure of water vapor | steam can be raised in the narrow space g, water vapor | steam can be ejected from the communicating hole 24 powerfully. As a result, it is possible to overcome the stickiness of the rice that has started gelatinization and generate a large convection, and it is possible to realize cooked rice that does not cause uneven heating and does not cause uneven cooking in the lower layer and upper layer of the rice.

  Moreover, since the partition plate 20 is coated with a fluororesin on its surface, rice is not sticky, has good cleanability and is easy to care for.

  Further, the communication hole 24 of the partition plate 20 has a constriction (orifice) 25 formed in the intermediate portion so that bubbles are easily grown at the time of boiling, and the upper portion 26 following the constriction (orifice) 25 is directed upward. Accordingly, the shape has a widened diameter. For this reason, after increasing the water vapor pressure, strong bubbles (steam) can be ejected upward.

  Moreover, since the partition plate 20 has the ribs 23 formed concentrically, and the communication holes 24 are provided between the concentric ribs 23, the bubbles can be blown up uniformly throughout.

  In addition, although the partition plate 20 is pressed down by the rice from above and the lift thereof is suppressed, a lift prevention that can be engaged between the inner hook 7 and the partition plate 20 may be provided.

Embodiment 2. FIG.
FIG. 7: is a top view which shows the partition plate of the electromagnetic induction heating cooking appliance concerning Embodiment 2 of this invention. FIG. 8: is a side view including the partial cross section display of the partition plate of the electromagnetic induction heating cooking appliance concerning Embodiment 2 of this invention. In each figure, the same reference numerals are given to portions corresponding to those of the first embodiment. In addition, since the main body 1, the lid 5, the steam conduit 13, the tank 10, and the communication hole 24 of the partition plate of the rice cooker 100 have the same configuration as that of the first embodiment, description thereof is omitted.

  As shown in FIGS. 7 and 8, in the rice cooker according to Embodiment 2 of the present invention, ribs 33 of the partition plate 30 are formed radially, and communication holes 24 are provided between the radial ribs 33. This is different from that of the first embodiment. Other configurations are the same as those of the first embodiment.

  Also in the rice cooker according to the second embodiment of the present invention, the bubbles can be blown up uniformly from the communication holes 24 between the radial ribs 33 as a whole.

Embodiment 3. FIG.
FIG. 9: is a top view which shows the partition plate of the electromagnetic induction heating cooking appliance concerning Embodiment 3 of this invention. FIG. 10 is a cross-sectional view in side view of the partition plate of the electromagnetic induction heating cooker according to the third embodiment of the present invention. FIG. 11 is an enlarged cross-sectional view showing a main part of FIG. In each figure, the same reference numerals are given to portions corresponding to those of the first embodiment. Here, the main body 1, the lid 5, the steam conduit 13, the tank 10, and the communication hole 24 of the partition plate of the rice cooker 100 have the same configuration as that of the first embodiment, and the description thereof is omitted. .

  As shown in FIGS. 9 to 11, the rice cooker according to Embodiment 3 of the present invention is a porous body in which the ribs 43 of the partition plate 40 are connected to each other and a plurality of sections surrounded by the ribs are formed. And the point that one communication hole 24 is provided in each hole of the porous body is different from that of the first embodiment. That is, the partition plate 40 is configured such that the ribs 43 are formed in a honeycomb structure here (a large number of hexagonal cylinders are arranged in a plane), and one communication hole 24 is provided in each of the holes of the honeycomb structure. It is what. Other configurations are the same as those of the first embodiment.

  In the rice cooker according to Embodiment 3 of the present invention, water is heated by electromagnetic induction in each section and blown up from one communication hole 24, so that stronger foam can be ejected uniformly from the pan bottom.

Embodiment 4 FIG.
FIG. 12: is a top view which shows the partition plate of the electromagnetic induction heating cooking appliance concerning Embodiment 4 of this invention. FIG. 13: is a side view including the partial cross section display of the partition plate of the electromagnetic induction heating cooking appliance concerning Embodiment 4 of this invention. In each figure, the same reference numerals are given to portions corresponding to those of the first embodiment. Here, the main body 1, the lid 5, the steam conduit 13, the tank 10, and the communication hole 24 of the partition plate of the rice cooker 100 have the same configuration as that of the first embodiment, and the description thereof is omitted. .

  As shown in FIGS. 12 and 13, in the rice cooker according to Embodiment 4 of the present invention, the ribs 53 of the partition plate 50 are connected to each other and the region B having the communication holes 24 and the communication holes 24. This is different from that of the first embodiment described above in that it is configured as a partition wall that is defined by a region C that does not exist. Other configurations are the same as those of the first embodiment.

  In the rice cooker according to Embodiment 4 of the present invention, the rib 53 configured as a partition wall has a region B (where bubbles are actively generated) with the communication holes 24 and a region C (bubbles) without the communication holes 24. Therefore, the upward flow is likely to occur in the region B where the communication hole 24 is present, and the downward flow is likely to occur in the region C where the communication hole 24 is not present. For this reason, it becomes easy to generate | occur | produce a convection, does not produce a heating nonuniformity in the lower layer part and upper layer part of rice, and can realize the rice cooking without a cooking nonuniformity.

  In each of the above-described embodiments, the rice cooker 100 is described as an example of the electromagnetic induction heating cooker. However, the present invention is not limited to this, and other cookers that perform cooking by electromagnetic induction heating. For example, it can be applied to an IH cooking heater as it is.

  1 body, 2 hinge mechanism, 3 latch, 4 release button, 5 lid, 6 inner case, 6a opening, 7 inner pot (pan-like container), 7a flange, 8 heating coil, 9 temperature sensor, 10 tank, 11 power supply board, 13 steam conduit, 20, 30, 40, 50 partition plate, 21 upper surface, 22 lower surface, 23, 33, 43, 53 rib, 24 communication hole, 25 constriction, 26 upper part, 100 rice cooker (electromagnetic induction heating Cooker), g narrow space, B area with communication holes, C area without communication holes.

Claims (10)

A main body, a pan-like container that is housed in the main body, and a heating coil that is disposed in a lower portion of the main body and induces an eddy current in the pan-like container to heat the pan-like container. In an electromagnetic induction heating cooker,
The pan-like container is composed of a carbon sintered material, and a partition plate that is composed of a carbon-sintered material and separates water and an object to be heated is stored in the pan-shaped container so as to be freely put in and out.
The partition plate has a plurality of ribs, and a plurality of ribs having a width or diameter smaller than the particle size of the object to be heated and communicating between the back and the front of the partition plate. An electromagnetic induction heating cooker characterized in that a communication hole is provided.   The rib of the partition plate is formed so as to protrude toward a pan bottom of the pan-shaped container, and an upper surface of the partition plate is formed flat. Electromagnetic induction heating cooker.   The electromagnetic induction heating cooker according to claim 2, wherein the rib of the partition plate is arranged to face the heating coil.   The partition plate is placed on the pan bottom of the pan-like container, and a narrow space is formed between the partition plate and the pan bottom with the rib serving as a spacer. The electromagnetic induction heating cooker according to claim 2 or 3.   The electromagnetic induction heating cooker according to any one of claims 1 to 4, wherein the partition plate has a surface coated with a fluororesin.   The electromagnetic induction according to any one of claims 1 to 5, wherein the communication hole of the partition plate has a shape in which a middle portion is constricted and a subsequent upper portion has a diameter increasing toward an upper side. Cooking cooker.   The electromagnetic induction heating cooking according to any one of claims 1 to 6, wherein the rib is formed concentrically in the partition plate, and the communication hole is provided between the concentric ribs. vessel.   The electromagnetic induction heating cooker according to any one of claims 1 to 6, wherein the partition plate has the ribs formed radially, and the communication holes are provided between the radial ribs.   The partition plate is configured as a porous body in which the ribs are connected to each other and a plurality of sections surrounded by the ribs are formed, and one communication hole is provided in each of the holes of the porous body. The electromagnetic induction heating cooker according to any one of claims 1 to 6, wherein   The partition plate is configured as a partition wall in which the ribs are connected to each other to define a region having the communication hole and a region having no communication hole. The electromagnetic induction heating cooker of crab.

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