JP2015205011A - Electric rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric rice cooker using a ceramic inner pot, capable of improving rice cooking heating performance as much as possible, thereby achieving cooked rice with good taste similar to the taste of the cooked rice cooked by an iron pot.SOLUTION: A ceramic outer pot for covering a ceramic inner pot which has an induction heating part on its outer peripheral surface side and generates heat, is provided for utilizing heat generated on the ceramic inner pot, and an induction heating part is provided on an inner peripheral surface side of the outer pot for covering the inner pot, for heating the inner pot by the outer pot, thereby solving a heating insufficient area on the inner pot side, so that cooking performance becomes excellent similarly to cooking by an iron pot and cooked rice with good taste and puffy texture without burning can be cooked.

Description

  The present invention relates to an electric rice cooker having an outer pot made of ceramic material on the outer periphery of an inner pot made of a ceramic material. More specifically, the inner pot is located on the outer peripheral surface of the inner pot, The pot relates to the structure of an electromagnetic induction heating type electric rice cooker that is located on the inner peripheral surface of the outer pot and is provided with induction heating portions.

  Recently, an electromagnetic induction heating type rice cooker with an inner pot made of a ceramic material such as a clay pot has gained popularity as an inner pot that can cook delicious rice with good cooked rice. .

  In such an electric rice cooker equipped with a ceramic inner pot, the inner pot itself does not generate heat due to electromagnetic induction. For example, an induction heating portion such as a silver paste is provided on the bottom portion of the inner pot and the curved portion on the outer periphery of the bottom portion. The induction heating part is induction-heated by electromagnetic induction means such as a work coil to heat the inner pot and cook rice.

  On the other hand, on the rice cooker body side, an inner pot accommodating space for accommodating such an inner pot is formed, and a bottomed cylindrical protective frame made of heat-resistant synthetic resin is formed in the inner pot accommodating space. It is installed and a storage port for the ceramic inner pot is formed through the bottomed cylindrical protective frame. The outer periphery of the bottom portion of the protective frame is provided with electromagnetic induction means such as a work coil for inductively generating heat from the induction heat generating portion corresponding to the induction heat generating portion of the ceramic inner pot bottom portion housed in the storage opening. ing.

  Therefore, when the electromagnetic induction means is driven, the induction heating portion of the ceramic inner pot is electromagnetically induced through the protective frame, and eddy current flows by the electromagnetic induction to generate heat. The kettle is heated from the bottom side to the side side (see Patent Document 1).

  In such a configuration, the inner pot is a ceramic material, and once stored, the heat storage power (heating power based on the amount of heat storage) is large, but on the other hand, heat transfer from the outside to the inside, from the bottom to the side It is inferior in heat transfer. In other words, since the inner hook has heat generating portions on the outer peripheral surface of the bottom portion and the bent portion of the inner hook, the outer surface of the bottom portion and the bent portion are considerably hot. There is a problem that heat is not easily transmitted.

  For this reason, in the case of the above configuration, a considerable amount of the heat of the bottom portion of the inner hook and the outer peripheral surface of the bent portion is wasted to the surroundings, and only the amount of heat (thermal power / electric power) is wasted. In addition, the heat resistance of the outer peripheral side protection frame and the like is also affected, and a high heat resistance structure is required.

  Therefore, in order to solve such a problem, a ceramic outer pot having a earthen function covering from the bottom of the inner hook to the vicinity of the bent portion is provided inside the bottom of the protective frame, The heat of the bottom part and the curved part outer peripheral surface side that becomes high temperature around the induction heating part is securely wrapped by the ceramic outer pot, and the bottom part of the inner pot and the bent part outer peripheral surface are maintained at a sufficiently high temperature state, By transferring heat at the same high temperature as efficiently as possible from the outer peripheral surface side to the inner peripheral surface side of the inner pot and from the bottom and bent portions to the side (side wall conduction and along the wall surface). The boiling performance (continuous boiling performance) during cooking is improved by heating the entire inner surface from the bottom to the side of the inner pot and the inner peripheral surface as efficiently as possible. Has also been proposed (See, for example, the configuration of Patent Document 2).

  That is, according to such a configuration, the radiant heat from the outer peripheral surface of the inner pot bottom portion having the induction heat generating portion is retained in the outer pot of the earthen structure and efficiently stored, and the temperature of the outer peripheral surface of the inner pot is made as much as possible. Can be kept high. Accordingly, the temperature on the inner peripheral surface side of the inner hook can be raised as efficiently as possible and can be kept high for a long time.

  In addition, the high-temperature heat stored in the inner pot bottom portion in this way is conducted to the inner pot side through the inner pot wall, and the high-temperature heat in the space between the outer pot and the outer pot. Air rises along the outer peripheral surface of the inner hook by convection, and also raises the temperature of the inner hook side.

  As a result, heat transfer is low, but once heated, the heat storage power of the ceramic inner pot, which has a large heat storage power, is effectively utilized, and the inner pot with rice and water is spread from the bottom to the side. A large amount of heat is stored, and a continuous boiling state with a large heating power can be realized for a long time. Therefore, the alpha conversion of the cooked rice is promoted, and a firm and delicious rice can be cooked while being fluffy from the core.

  Further, since the outer hook functions as a heat shield plate to the protective frame and the work coil side, the heat resistance standards on the protective frame and the work coil side are also gradual.

JP 2007-244648 A JP 2013-244107 A

  In the electric rice cooker provided with the outer pot as described above (Patent Document 2), as described above, the outer pot fulfills the function of the inner pot, and the inner pot includes the induction heating portion of the inner pot and the induction heating portion. It is possible to prevent the heat generated from the outer periphery of the bottom portion from escaping to the outside, to act as effectively as possible on the inner hook side, and to keep the temperature of the inner hook as high as possible. However, in the case of the inner pot having the above configuration, the induction heat generating portion is arranged at two places, the bottom portion and the curved portion of the inner hook in order to make the heating area as wide as possible, and the electromagnetic induction means also corresponds to the protective frame. Although it is provided at two places, the bottom and the bent portion, it is not provided on the side portion of the inner hook. Therefore, as described above, the outer hook performs the function of the inner hook and prevents the heat generated from the outer periphery of the inner hook induction heat generating portion and the bottom of the inner hook provided with the induction heat generating portion from escaping to the outside. Although the outer pot can be made to act as effectively as possible on the inner pot side, the outer pot is only provided to cover the bottom of the inner pot and the outer periphery of the bent part, and the outer pot itself generates heat. It is not a thing, it just covers the bottom of the inner pot and the outer periphery of the bent part so that the heat from the induction heating part does not escape, the inner pot has poor heat transfer even if the heat storage power is large, The fact is that the amount of heating at the side of the inner hook is not sufficient because the heat from the induction heating part is not easily transmitted to the whole.

  When rice is cooked with an actual earthen rice cake, the temperature of the space in the kettle reaches about 120 ° C even though no pressure is applied in the kettle. This is because in the case of rice bran, the heating during cooking is good, and it is also heated effectively from the side of the kettle, and the rice cooked with rice cake is particularly delicious when the side and top of the rice are above By being heated evenly at such a high temperature.

  For this reason, in the case of the conventional electric rice cooker with an outer pot, auxiliary heating means comprising a separate cord heater is provided on the protective frame side corresponding to the side portion of the inner pot. To compensate for the lack of heating. However, when trying to increase the amount of heat stored in the inner pot, the wall thickness of the side part inevitably increases.Indirect heating with a cord heater is insufficient, and sufficient heating power such as firewood is obtained. Absent.

  Of course, it is possible to provide an induction heat generating portion similar to that of the bottom portion on the outer periphery of the side portion of the inner hook, and to provide electromagnetic induction means such as a work coil in place of the code heater in the protective frame portion. In this way, the amount of heating at the side of the inner pot is sufficient, but the temperature rise is local, and the side of the inner pot is near the upper surface of water and rice during absorption, This is a portion corresponding to the vicinity of the upper part of the rice at the time of cooking, and if it is left as it is, the heating power is too strong, and there arises a problem of causing burning.

  Therefore, even if an induction heating unit for heating the side portion of the inner pot is provided to realize the cooking of rice close to the rice cake, it is required that the heat generated by the induction heating unit does not cause burning of the rice. In addition, it must be considered that the amount of heat generated at the bottom induction heating portion of the inner hook is more effectively utilized than that of Patent Document 2.

  The invention of this application was made to solve such a technical problem. As described above, an outer pot that covers the inner pot having the induction heat generating portion is provided on the outer peripheral surface side, and the inner pot side heat is provided. In addition, by providing an induction heating part on the inner peripheral surface side of the outer hook that covers the inner hook so that the inner hook can be heated even by the outer hook, the inner hook side is insufficiently heated. An object of the present invention is to provide an electric rice cooker that eliminates the area and is capable of cooking delicious, plump, non-burning rice as in the case of rice cakes.

In order to achieve the above object, the present invention is configured with the following problem solving means.
(1) Invention of Claim 1 An electric rice cooker according to the present invention comprises a ceramic inner pot having an induction heating part on the bottom side, and a rice cooker body provided with an inner pot accommodating space in which the inner pot is accommodated, A protective frame provided in the inner pot accommodating space of the rice cooker body, forming a storage groove for the inner pot, a ceramic outer pot provided inside the protective frame, and a bottom side of the protective frame An electromagnetic induction means provided on the outer periphery for inductively generating heat by the induction heating portion of the inner pot via the outer pot; and a lid provided on the upper side of the inner pot storage groove of the rice cooker body so as to be openable and closable. Electromagnetic rice cooker comprising: an induction heating portion provided on the inner peripheral surface of the outer pot; and induction induction heating the induction heating portion on the outer periphery of the protective frame corresponding to the induction heating portion Means is provided.

  According to such a configuration, first, the bottom of the ceramic inner pot is heated by the heat generated by the bottom induction heating unit and locally becomes high temperature, and eventually the same high temperature heat is generated from the bottom side to the side side. It is gradually conducted through the wall, and eventually the temperature on the side increases to a predetermined temperature.

  In this configuration, in addition to this, a ceramic outer pot is provided inside the protective frame in which the inner pot is accommodated, and the outer periphery of the inner pot whose temperature gradually rises as it is heated by the bottom side induction heat generating portion. Heat that is radiated outward from the bottom side induction heating section and the outer peripheral surface of the inner hook is covered by the ceramic outer pot, and is enclosed by the ceramic outer pot and wraps around the outer periphery of the inner pot. In this case, heat is stored between the inner pot and the outer pot, and the outer peripheral surface of the inner pot is heated and heated in the same heat storage state.

  In addition, high-temperature air between the inner and outer pots heated and heated in the same heat storage state rises from the bottom outer peripheral surface of the inner pot along the side outer peripheral surface by convection, and further the inner pot The entire outer peripheral surface is heated and heated.

  As a result, the temperature of the inner pot rises relatively quickly from the bottom side to the entire side portion, and the amount of heat is effectively stored. Therefore, the amount of heat generated in the induction heat generating portion can be effectively applied to the entire inner hook.

  In addition, in the case of the configuration of the present invention, in that case, an induction heat generating portion is further provided on the inner peripheral surface of the outer hook, and the induction heat generating portion is disposed on the outer periphery of the protective frame corresponding to the induction heat generating portion. Electromagnetic induction means for induction heating is provided, and the outer hook is heated from the inner peripheral surface side by the heat generated by the induction heating portion.

  Therefore, the ceramic outer pot is not only to cover the outer periphery of the inner hook so as not to let the heat from the inner hook side escape, as in the prior art, but itself is heated to a high temperature, The outer pot in the same high temperature state actively heats the outer periphery of the inner pot, and the entire inner pot including the side portion is effectively heated and heated. As a result, it is possible to maintain the temperature of the upper space in the inner pot close to 120 ° C., as in the case of cooking with rice cake, and the whole rice is fully heated and continuously boiled to make it fluffy from the core. In addition, you will be able to cook a solid rice.

  In addition, the heating of the inner hook is different from the case where, for example, an induction heat generating part is directly provided on the side of the inner hook or the like, which is indirect heating through a narrow gap from the outer hook side, and radiation from the entire outer hook is performed. Since the inner pot is heated uniformly by heat, the distribution of the heating temperature becomes uniform, and there is a risk of causing scorching due to local heating as in the case of heating by providing an induction heating part directly on the side of the inner pot, etc. Disappear.

In addition, when the induction heating part is provided on the inner peripheral surface of the outer hook in this way, the distance from the electromagnetic induction means on the protective frame side is smaller than when the induction heating part is provided on the inner hook side. Becomes higher. Therefore, the generation of noise is small, for example, the diameter of the litz wire of the work coil can be reduced, the number of turns can be reduced, and it can be realized at a relatively low cost.
(2) Problem-solving means of the invention of claim 2 The problem-solving means of the invention is the construction of the problem-solving means of the invention of claim 1, wherein the side portion of the outer hook extends to the vicinity of the side portion of the inner hook. The induction heating part is provided on the inner peripheral surface of the extension part, and the electromagnetic induction means for inductively generating the induction heating part is provided on the outer periphery of the side of the protective frame corresponding to the induction heating part. It is characterized by being.

  According to such a structure, the outer shell made of ceramic is heated to a high temperature by efficiently heating the inner peripheral surface of the side portion extended to the position corresponding to the side portion of the inner pot, The side area of the inner hook which has been underheated is effectively heated, and the entire inner pot including the side area is effectively heated and heated.

As a result, the space above the rice in the inner pot is effectively maintained at the same high temperature as in the case of rice cake.
(3) The problem-solving means of the invention of claim 3 The electric rice cooker of the present invention is the structure of the problem-solving means of the invention of claim 1 or 2, wherein the side of the outer pot is extended to the side of the inner pot. The part position is characterized by being in the vicinity of the upper position of the rice after completion of cooking determined from the rated rice cooking capacity of the rice cooker.

  In such a configuration, it is possible to apply an appropriate amount of heating near the upper position of the rice after completion of cooking determined from the rated rice cooking capacity of the rice cooker, so that it is delicious without causing scorching It becomes possible to cook rice.

  As a result of the above, according to the invention of this application, the combination of the inner pot and the outer pot, both of which have a heating function, enables appropriate heating of the entire inner pot, and the amount of heat storage unique to the ceramic inner pot is reduced. As a result, it becomes possible to continuously heat the entire bottom and side portions of the inner pot with a sufficient amount of heat, and the same continuous operation as in the case of a firewood that effectively ignites the entire inner pot. Effective cooking by boiling can be realized.

  As a result, it is possible to cook a firm and delicious rice without causing a burnt, as well as fluffing up to the core, just as when cooking with a bowl.

It is a top view which shows the structure of the electric rice cooker main body upper part which concerns on embodiment of this invention. It is sectional drawing in the AA line cutting | disconnection part of FIG. 1 which shows the structure inside the electric rice cooker main body which concerns on embodiment of this invention. It is an expanded sectional view of the left half part (front part) of Drawing 2 which shows the composition inside the electric rice cooker body concerning an embodiment of the invention of this application. It is sectional drawing which shows the structure of the inner-pan part in the electric rice cooker main body shown to FIG. 2, FIG. It is a vertical exploded perspective view which shows the structure of the shoulder member in the rice cooker main body shoulder part of the electric rice cooker main body shown in FIG. 2, FIG. 3, a shoulder heater frame, a shoulder heater cover, the sliding packing for sealing, and each part of a metal plate. The outer pot of the electric rice cooker main body shown in FIGS. 2 and 3, the second protective frame unit (upper), the first protective frame unit (lower), the magnetic shielding plate, the first and second work coils, and the ferrite core FIG. 3 is a vertical exploded perspective view showing the configuration of each part of the coil base.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings of FIGS.

The structure of the rice cooker main body of the electric rice cooker concerning one embodiment of this invention and its principal part is each shown by FIGS.
<Configuration of the rice cooker body>
The rice cooker main body in the electric rice cooker concerning this embodiment is equipped with the 1st induction heating part G1 in the bottom part 3a, and the 2nd induction heating part G2 in the bending part 3b first, as shown in FIGS. A bottomed cylindrical inner pot 3 made of a ceramic material containing rice and water (for example, a ceramic inner pot such as an earthen pot), and a third induction heat generating part G3 on the inner peripheral surface of the side, 3 is provided with a bottomed cylindrical outer pot 6 made of the same ceramic material covering the bottom 3a to the side 3c, and the outer pot 6 is provided on the bottom side. A protective frame (inner case) 4 forming an inner hook storage groove 5 for arbitrarily storing and setting the inner hook 3, and a rice cooker body case 1 having a protective frame storage space for storing and holding the protective frame 4; The rice cooker body case 1 is provided on the rear end side of the opening 5a of the inner pot storage groove 5 of the rice cooker body case 1. And a lid 2 which for opening and closing the same opening 5a. The first and second induction heat generating parts G1 and G2 of the inner pot 3 and the third induction heat generating part G3 of the outer pot 6 are formed by, for example, silver paste or aluminum spraying.

  The rice cooker body case 1 includes a bottom side dish-like bottom case 1b having synthetic resin legs 64, 64,... As well as a synthetic resin side cylindrical outer case 1a. A shoulder member 8 made of synthetic resin, which will be described later, is provided inside the upper end portion of the outer case 1a, and the protective frame 4 forming the inner hook housing groove 5 is connected and supported via the shoulder member 8. An edge 84 having an inverted U-shaped outer peripheral side cross section of the shoulder member 8 is engaged with the entire circumferential direction so as to be engaged with the engaging edge 10 having a bowl-shaped cross section on the upper end side of the outer case 1a. Yes.

  The protective frame 4 is composed of two upper and lower housing members, each of which is a synthetic resin molded first and second separate protective frame unit (lower unit) 4A and second protective frame unit (upper unit) 4B. The second protective frame unit 4B constituting the upper housing is laminated on the upper part of the first protective frame unit 4A constituting the lower housing, and is integrally formed.

  First, the first protective frame unit 4A constituting the lower housing includes a bottom portion 41a formed of a flat circular surface having a predetermined radius, and a predetermined height upward while gradually increasing the diameter from the outer periphery of the bottom portion 41a. A bent portion 41b extending in the direction of the curved portion 41b, a stepped portion 41c having a curved cross section formed on the upper edge of the bent portion 41b in a radially outward direction, and rising substantially vertically from the outer peripheral portion of the stepped portion 41c. The support wall 41d is formed with a cylindrical wall having a predetermined height. And this 1st protection frame unit 4A part is supported by the lower side coil stand 9 which mentions the bottom part 41a and the curved part 41b part later.

  Next, the second protective frame unit 4B constituting the upper housing is centered on a cylindrical wall 42b having a U-shaped cross section that is open outward in the radial direction, with a lower end on the lower side. A mounting portion 42a on the support wall 41d of the first protective frame unit 4A is provided, and a hook-like engagement step portion 42d that is enlarged outward in the predetermined radial direction is provided on the upper end side thereof. . An upper portion (substantially upper half portion) partitioned by the rib 42c on the outer peripheral surface of the cylindrical wall 42b of the second protective frame unit 42B is an installation surface (coiled surface) of a third work coil C3 described later. And a third work coil C3 wound in two layers inside and outside is installed on the work coil installation surface. Further, ferrite core storage portions 42e, 42e,... Extending vertically at predetermined intervals in the circumferential direction are provided on the outer peripheral portion, and the ferrite core storage portions 42e, 42e,. In this manner, ferrite cores 80, 80.

  In this case, as described above, the installation surface of the third work coil C3 is not the entire vertical width of the cylindrical wall 42b, for example, the upper half portion. This is to increase the separation distance from the second work coil C2 on the first protective frame unit 4A side to avoid mutual induction interference and to prevent noise generation.

  The first and second protective frame units 4A and 4B are stacked and integrated vertically as shown in FIGS. 2 and 3, so that the protective frame 4 formed as a whole with a bottomed cylindrical structure is provided. On the bottom upper surface side (the upper surface side of the bottom portion 41a and the curved portion 41b of the first protective frame unit 4A), the bottom portion 6a and the curved portion 6b of the outer pot 6 made of the ceramic material are partially disposed in the radial direction. The upper portion of the ceramic outer pot 6 is pasted with a predetermined heat-insulating air layer maintained on a portion having a predetermined thickness and an adhesive portion (not shown) and without adhesive. For example, as shown in FIG. 4, the first and second induction heating elements G1 and G2 made of the silver paste or the aluminum spray are provided on each of the circular flat bottom 3a and the curved portion 3b on the rounded surface. The same circular bottom 3a of the ceramic inner pot 3 And curved portions 3b on the curved surface of the outer periphery is adapted to be accommodated while maintaining a predetermined clearance S.

  Then, in the same storage state, for example, as shown in FIGS. 2 and 3, the upper end of the side portion 6c extends to the upper portion of the side portion 3c of the inner hook 3, and the extension portion The ceramic outer hook 6 provided with the third induction heat generating part G3 on its inner peripheral surface is sufficiently covered from the bottom 3a of the inner hook 3 to the vicinity of the side 3c. The third induction heat generating part G3 is also formed by silver paste or aluminum spraying.

  By the way, the outer hook 6 of this embodiment has a bowl-like structure as a whole, for example, as shown in detail in FIG. 6, and the first protective frame unit 4A is provided at the center of the flat circular bottom 6a. A center sensor sensor insertion hole 6e corresponding to the center sensor insertion hole 10a at the center is provided, and the sensor part above the center sensor CS fitted in the center sensor insertion hole 10a can be moved up and down. A pedestal support made of a heat-resistant elastic member such as silicon rubber that supports the pedestal 3e of the inner hook 3 at a predetermined interval in the circumferential direction on the outer periphery in the radial direction while being inserted in a fitted state. Elevated part support member fitting holes 6f, 6f,... For fitting the members 61, 61,. Further, from a heat-resistant elastic member such as silicon rubber that supports the outer periphery of the bent portion 3b of the inner hook 3 at a predetermined interval in the circumferential direction at a portion near the outer periphery of the bent portion 6b at the upper outer peripheral side. Centering support member fitting holes 6g, 6g,... For fitting the centering support members 62, 62,.

  In each of the fitting holes 6f, 6f, 6g, 6g,..., High base support members 61, 61,..., Centering support members 62,. .. Are respectively fitted and fixed to support the bottom portion 3a and the bent portion 3b of the inner hook 3, but the hill portion supporting members 61, 61,... Are provided on the lower first protective frame unit 4A. Are supported in a stable fixed state between the pocket portions P, P,... And the upper portion 3e portion of the outer periphery of the bottom portion 3a of the inner hook 3 is placed in a state where it abuts downward from above, as will be described later. When the protective frame 4 and the outer hook 6 that are elastically supported so as to be movable up and down via the floating support mechanisms 63, 63... Are lowered according to the weight of the inner hook 3, the outer periphery of the opening 3 d of the inner hook 3. The side flange portion F of the shoulder member 8 to be described later Engaged on the edge 82 portion through a heat-resistant support member, the inner hook 3 is uniformly suspended over the entire circumferential direction, and the first and second work coils C1 on the protective frame 4 side. , C2 and the first and second induction heating portions G1 and G2 are in an appropriate positional relationship and are opposed to each other via an appropriate induction gap, and an appropriate predetermined gap is provided between the outer hook 6 and the outer casing 6. (Heat storage / convection space) S is supported in a maintained state.

  At the same time, the opposing position and the corresponding distance between the third induction heat generating portion G3 on the inner peripheral surface of the side portion 6c of the outer hook 6 and the side portion 6c portion of the inner hook 3 that are induction-heated by the third work coil C3. Is also maintained at an appropriate design position and design distance.

  On the other hand, the centering support members 62, 62,... On the outer peripheral side of the bent portion not only support the inner hook 3 in the protective frame 4 in an appropriate positional relationship via the outer hook 6 after being stored, The outer periphery of the bent portion 3b of the inner hook 3 stored at the time is guided in the entire periphery so as to be stored in an accurate positional relationship, and the centering function is properly performed.

  Further, the protruding dimensions of the hill support members 61, 61... And the centering support members 62, 62... To the inner side of the outer hook 6 are such that the inner hook 3 is properly fitted in the protective frame 4 as described above. 2 and 3 that are stored and set in a positional relationship, the dimensions are set so as to form an appropriate gap S between the outer peripheral surface of the inner hook 3 and the inner peripheral surface of the outer hook 6.

  As a result, in the storage state of the inner hook 3 shown in FIGS. 2 and 3, the bottom portion 3a and the bent portion 3b of the inner hook 3 are heated by the heat generated by the first and second induction heating portions G1 and G2. The side portion 3c where the temperature is locally high and the heat at the same time is gradually conducted from the bottom portion 3a and the bent portion 3b side to the upper side portion 3c through the inside of the wall, and no induction heating portion is provided. The temperature on the side also increases gradually.

  Further, in the above configuration, in addition to this, the ceramic outer hook 6 is also provided inside the protective frame 4 in which the inner hook 3 is accommodated, and the first and second induction heating portions G1 and G2 are connected to each other. The outer periphery of the inner pot 3 is covered with the outer pot 6 made of ceramic, so that the bottom 3a of the inner pot 3 and the induction heating parts G1 and G2 of the bent part 3b and the vicinity of the induction heating parts G1 and G2 are outward. The heat radiated to the outer pot 6 is cut off by the outer pot 6 made of the same ceramic, and the radiant heat radiated outward from the induction heating section G1 of the bottom 3a of the inner pot 3, the induction heating section G2 of the bent section 3b, and the vicinity thereof. Heats the inner hook 3 itself in such a way as to envelop the outer periphery of the inner pot 3, and the same heat is stored in the opposing surface portion between the outer hook 6 and the inner hook 3 and the gap S between them. The hot air heated in the state is Bottom 3a of the inner hook 3 through S, increases from the outer peripheral surface side of the curved portion 3b on the outer peripheral surface of the side portion 3c, the whole of the inner hook 3 the outer peripheral surface heating, so heated.

  As a result, the inner hook 3 reaches a relatively high temperature from the bottom 3a and the bent portion 3b side to the entire side portion 3c, and effectively stores the amount of heat. Therefore, the amount of heat generated in the first and second induction heat generating portions G1 and G2 can be used effectively.

  Furthermore, in the case of the configuration of this embodiment, in that case, a third induction heat generating portion G3 is provided on the inner peripheral surface of the side portion of the outer hook 6 and corresponds to the third induction heat generating portion G3. A third work coil C3, which is electromagnetic induction means for inductively generating heat from the third induction heat generating part G3, is provided on the outer periphery of the side wall of the protective frame 4, and the side part 6c of the outer hook 6 is Heating is performed from the inner peripheral surface side.

  Therefore, the ceramic outer pot 6 is not only simply covered with the outer periphery of the bottom portion 3a side of the inner hook 3 so as not to release heat, as in the conventional case described above. The radiant heat from the outer pot 6 in the same high temperature state actively heats the inner pot 3 at a close distance with a slight gap S. The inner pot 3 is not only on the bottom side, The whole including the side portion 3c that has been insufficiently heated in the past is effectively heated and heated. In this case, since the distance between the third work coil C3 and the third induction heating part G3 is short, the induction efficiency of the third induction heating part by the third work coil C3 is high, and noise is hardly generated.

  Moreover, the heating of the side portion 3c portion of the inner hook 3 is different from the case where the induction heating portion is directly provided in the side portion 3c portion of the inner hook 3, for example, and is heated at a predetermined distance from the outer pot 6 side. Since the inner hook 3 is heated by the radiant heat from the entire side portion 6c of the outer pot 6, the heating state becomes uniform, and the side portion of the inner pot 3 is heated. There is no possibility of causing scorching due to local heating as in the case of heating by directly providing an induction heating part in 3c and the like.

  In addition, in the case of this embodiment, the side portion 6c of the outer hook 6 is highly extended to the vicinity of the upper portion of the side portion 3c of the inner hook 3, and is located on the inner peripheral surface of the side portion 6c extended to be high. The third induction heat generating part G3 is provided, and a third work coil C3 for inductively generating heat by the third induction heat generating part G3 is provided on the outer periphery of the side wall of the protective frame 4 corresponding to the third induction heat generating part G3. Is provided.

  Therefore, in the ceramic outer hook 6, the inner peripheral surface of the side portion 6c extended to a position corresponding to the upper portion of the side portion 3c of the inner hook 3 is efficiently heated to become a high temperature. The upper portion of the side portion 3c of the inner pot 3 which has been underheated is also effectively heated, and the entire inner pot 3 including the side portion 3c and the upper portion thereof is effectively heated and heated. Thus, the space portion of the upper part of the rice in the inner pot 3 is maintained at a high temperature state (near 120 ° C.) similar to the case of rice cake.

In this case, the upper position of the side portion 3c of the inner pot 3 where the side portion 6c of the outer pot 6 provided with the third induction heat generating portion G3 is extended is, for example, the electric rice cooker as shown in FIG. It corresponds to the upper position vicinity (position above the position of the water at the time of water absorption) of the rice after the completion of cooking determined from the rated rice cooking capacity. When doing so, it is possible to appropriately apply a sufficient and sufficient amount of heat similar to the case of rice cake to the cooked rice and its upper space position after completion of cooking determined from the rated rice cooking capacity of the electric rice cooker. Thus, it becomes possible to cook more delicious rice without causing uneven cooking without causing burning.
<Floating support structure of protective frame>
As described above, the protective frame 4 in this embodiment is configured by vertically integrating the first and second protective frame units 4A and 4B. The first protective frame unit 4a includes, for example, .. Are floatingly supported on the above-described bottom case 1b via floating support mechanisms 63, 63,... Having coil springs, and can be raised and lowered within a predetermined vertical dimension range.

  On the other hand, the second protective frame unit 4B is also raised and lowered in the same manner as shown in FIGS. 2 and 3 mounted on the upper portion of the first protective frame unit 4A. As a result, the bowl-shaped outer hook 6 housed and installed in the bottomed cylindrical protective frame 4 composed of the first and second protective frame units 4A and 4B is also used for the first and second protective frame units. It moves up and down with 4A and 4B in the same manner (see arrows in FIG. 3).

  Therefore, when the inner pot 3 containing water and rice is stored on the outer pot 6 via the high platform support members 61, 61,... And the centering support members 62, 62,. According to the weight, the protective frame 4 and the outer hook 6 are lowered together with the inner hook 3 by a predetermined dimension, and the lower surface of the flange portion F at the outer end of the opening 3d of the inner hook 3 is connected to the opening 5a of the inner hook housing groove 5. The heat-resistant support member part on the inner peripheral edge part 82 of the shoulder member 8 is formed and supported in a state of being suspended from the part.

  As a result, in the case of this embodiment, the inner hook 3 provided with the first and second induction heat generating parts G1 and G2 on the bottom side is the first provided with the first and second work coils C1 and C2. The third work coil C3 and the third induction heating part G3 of the second protection frame unit 4B provided with the first and second work coils C1 and C2 and the third work coil C3 of the protection frame unit 4A The third induction heat generating part G3 of the outer pot 6 provided is set at an appropriate position and dimensional relationship.

At this time, the hill support members 61, 61... And the centering support members 62, 62... Set an appropriate gap S between the outer hook 6 and the inner hook 3, and the centering support members 62, 62. ·· fulfills the centering function of the inner hook 3 during storage as described above.
<About the seal structure of the clearance for lifting>
By the way, when the protective frame 4 and the outer pot 6 are made floating with respect to the rice cooker body as described above, and the lifting space D is formed between the shoulder member 8 and the upper end 6d of the side portion 6c of the outer pot 6, There is a risk that heat between the inner hook 3 and the outer hook 6 escapes from the ascending / descending space D to the outside, water on the outer periphery of the inner hook 3 may invade, and the inner pot housing groove 5 does not look good. There are problems such as.

  Therefore, in this embodiment, they are assembled on the inner peripheral edge side of the metal plate 32, 32 for reinforcing the shoulder heater frame 31 and the shoulder heater cover 30 with respect to the shoulder member 8 described above on the upper side of the lifting space D. Thereafter, for example, as shown in FIG. 3, the shoulder member 8 and the outer hook 6 are extended by a predetermined dimension on the inner peripheral surface side (opening inner peripheral surface side) of the upper end 6d of the side portion 6c of the lower outer hook 6. A skirt-like sliding packing 35 is attached to seal the elevating space D between the upper portion 6d and the side portion 6c in the inner and outer directions over the entire circumferential direction, and above the protective frame 4 and the outer hook 6. When the shoulder member 8, the shoulder heater frame 31, the shoulder heater cover 31, the sliding packing 35, and the metal plates 32, 32 are overlapped and connected and integrated, the skirt portion of the sliding packing 35 (for sealing) Edge) 35b is the side of the outer hook 6 It is adapted to slidably inscribed with the inner circumferential surface of the c of the upper end 6d.

For example, as shown in FIG. 5, the packing 35 is provided with a fixing portion 35 a that is sandwiched and fixed between the metal plates 32 and 32 and the shoulder heater cover 30 on the upper side of the skirt portion 35 b. The fixing portion 35a is used for attachment as shown in FIG.
Yes.
<Installation of shoulder heater at shoulder>
As described above, the opening 5a of the inner pot storage groove 5 in the rice cooker main body of this embodiment has the shoulder member 8 fitted and fixed to the inner peripheral edge of the upper end 1c of the main body outer case 1a, and the shoulder. It consists of a shoulder heater cover 30 and a shoulder heater frame 31 that are connected and fixed from the lower side through metal plates 32 and 32 and a packing 35 inside the inner peripheral portion of the member 8. The cross-sectionally U-shaped structure is opened to the outside in the radial direction, and a shoulder heater H made of, for example, a code heater is provided on the entire outer circumferential surface. When the shoulder heater H generates heat, for example, as shown in FIG. 3, in the inner state of the opening 3 d of the inner hook 3 as shown in FIG. The lower part of the thick heat-keeping part HK is efficiently heated to prevent the occurrence of dew in the same part, thereby preventing the occurrence of white blur of the rice.

  In FIG. 3, reference numeral 30 a is a connecting portion with the outer case 1 a provided at the lower part of the shoulder heater cover 30, and reference numeral 30 b is the third work provided at the lower part of the shoulder heater cover 30. This is a boss portion for mounting the magnetic shielding plate 17 covering the outer periphery of the coil C3. A magnetic shielding plate 17 is attached to the boss portion 30b via a screw 30c.

Reference numeral 32a denotes a screw that connects the shoulder heater cover 30 and the shoulder heater frame 31 from the lower side through the metal plates 32 and 32 and the packing 35 on the inner peripheral part inside the shoulder member 8 (on the lower side). is there.
<About the configuration of the coil stand>
On the other hand, on the lower side of the protective frame 4 configured as described above (the lower side of the first protective frame unit 4A), a synthetic resin dish-shaped coil base 9 that supports the bottom of the protective frame 4 is provided. Is provided. For example, as shown in FIG. 6, the coil base 9 is positioned on the upper surface side in the circumferential direction 4, and the first and second work coils C <b> 1 on the outer peripheral surface side of the first protective frame unit 4 </ b> A. , Ferrite core housing grooves 9a, 9a,... Extending in the radial direction corresponding to C2 are provided, and the first and second ferrite core housing grooves 9a, 9a,. .. Are accommodated for the work coils C1, C2. The first and second work coils C1, C2 are supported in four directions by the upper surfaces of the ferrite core housing grooves 9a, 9a,. Then, the first protective frame unit 4A and the coil base 9 are connected and fixed to each other using a connecting portion on the outer peripheral side.

Further, on the outer peripheral side of the lower part of the coil base 9, four leg portions 9b, 9b,... Are provided downward corresponding to the positions of the ferrite core housing grooves 9a, 9a,. The leg portions 9b, 9b,... Are supported by floating support mechanisms 63, 63,... Provided on the bottom case 1b. A center sensor body fitting opening 9c is provided at the center of the coil base 9 so as to be concentric with the center sensor fitting hole 10a on the first protective frame unit 4A side. -The center sensor CS composed of an inner pan temperature detection sensor such as a thermistor is moved upward from below in a state that it can be moved up and down through the sensor body fitting port 9c and is always upwardly biased by a coil spring. It is installed so as to face.
<Configuration of lid>
On the other hand, the lid body 2 that covers the opening 5a of the inner pot housing groove 5 of the rice cooker body includes an upper plate 20 made of synthetic resin that constitutes an upper outer circumferential surface (upper surface and side surfaces in the circumferential direction), and the upper plate. A synthetic resin lower plate 22 provided on the inner side (lower side) of 20 and polymerized and fixed to the inner side (lower side) of the main body of the lower plate 22 via a first packing 25 made of rubber. A metal heat radiating plate 23 having a lid heater (not shown) and a second rubber rim provided on the outer periphery of the heat radiating plate 23 via a synthetic resin detachable frame member 27. It is formed from a metal inner cover 24 to which a packing 14 is attached.

  In order to increase the pressure resistance strength, the outer peripheral side portion of the rear end portion 22a of the lower plate 22 main body portion serving as the center is locked to the connecting piece on the hinge unit 11 side via a connecting piece, a screw or the like. At the same time, the upper surface of the main body of the lower plate 22 is provided with a predetermined thickness, a metal reinforcing plate having a predetermined structure, and a large number of reinforcing ribs in the left and right and front and rear directions. It is designed to form a high strength structure.

  That is, the lower plate 22 has an intermediate portion of the rear end side outer periphery 22a of the main body portion bent upward in the shape of a U, houses the above-described hinge unit 11 on the inner side, and has an outer peripheral end side. The descending portion covers the hinge unit 11.

  And the rear end side outer periphery 22a of these lower plates 22 is used as a bracket for attaching a lid body, and the lid body 2 has a rear end side thereof as a mounting wall 8b portion on the rear end side of the shoulder member 8 on the upper portion of the rice cooker body ( 5) and is pivotally attached via a hinge unit 11 (hinge shaft 11a), and its open end side (front end side) is engaged with a predetermined position of the lid body 2 to A lock and unlock mechanism 13 for opening and closing the body 2 in the vertical direction is provided. On the upper end surface 8a portion of the shoulder member 8, a receiving surface having a shape corresponding to the shape of the lower surface of the outer peripheral portion of the lid body 2 is formed.

The lid 2 is detachably provided with a pressure adjusting cap 51 having steam ports 51a and 51a corresponding to a pressure adjusting mechanism and a pressure adjusting passage, which will be described later.
<Configuration of pressure adjustment mechanism in lid part>
In this embodiment, it shows about the case where it applies to a pressure type electric rice cooker as an example, and the steam escape passages 50 and 50a-50c mentioned below are collected in the rear part side in the above-mentioned lid 2 while collecting viscous components. And the pressure regulating units 26A and 26B (for 26B) that allow only the steam to escape to the outside through the steam ports 51a and 51a of the pressure regulating cap 51 and adjust the pressure in the inner pot 3 in a plurality of stages according to the rice cooking process. 2 is omitted because it is not visible in the cross section of FIG.

These pressure control units 26A and 26B are constituted by, for example, the steam escape passages 50 and 50a to 50c that detour from the inside of the inner pot 3 to the outside, and pressure adjusting mechanisms provided in the steam escape passages 50 and 50a to 50c. ing.
<About the configuration of the operation panel and display panel on the top of the lid>
Reference numeral 60 in FIG. 1 denotes an operation panel. The operation panel 60 has a substrate and a liquid crystal panel storage box (a box-shaped storage formed in the front portion of the upper plate 20) on the back side of the panel portion. The microcomputer board 60B and the liquid crystal panel 60A having a microcomputer control unit as rice cooking and heat retention control means are housed and installed in the board and the liquid crystal panel storage box 21.

The center has a transparent window 60C of a predetermined shape and a predetermined size corresponding to the display surface of the liquid crystal panel 60A, and a rice cooking reservation switch SW1 for timer rice cooking around the transparent window 60C. Switch SW2, heat retention switch SW8, cancel switch SW3, menu switch SW5 (return, proceed) for selecting a rice cooking menu (for example, white rice, quick cooking, rice bran, brown rice and other course menus), hot spring selection switch SW4, finish switch Various operation keys of SW6, voice guide switch SW7, time and minute setting switch SW9 of a clock and a timer, and a human detection sensor (human sensor) MS are provided.
<Operation by the configuration of this embodiment>
As described above, the electric rice cooker according to this embodiment includes the ceramic inner pot 3 having the first induction heat generating part G1 on the bottom 3a side and the second induction heat generating part G2 on the bent part 3b side. The rice cooker main body case 1 having an inner pot accommodating space in which the inner pot 3 is accommodated, and the inner pot accommodating space 5 of the rice cooker main body case 1 are provided in the inner pot accommodating space to form the storage groove 5 of the inner pot 3. A protective frame 4 to be formed, a ceramic outer hook 6 provided on the inner side of the protective frame 4, and provided on the outer periphery of the bottom portion and the bent portion of the protective frame 4. The first and second work coils C1 and C2 which are electromagnetic induction means for inductively generating heat of the first and second induction heating portions G1 and G2, and the upper portion of the inner pot storage groove 5 of the rice cooker body case 1 In the electric rice cooker comprising the lid 2 that can be opened and closed on the side, The third induction heat generating part G3 is provided on the peripheral surface side, and electromagnetic induction means for inductively generating the third induction heat generating part G3 on the outer periphery of the protective frame 4 corresponding to the third induction heat generating part G3. A third work coil C3 is provided.

  According to such a configuration, in the storage state of the inner hook 3 shown in FIGS. 2 and 3, the bottom 3a and the bent portion 3b of the inner hook 3 are heated by the heat generated by the first and second induction heating portions G1 and G2. The temperature is locally increased, and the heat of the same temperature is gradually conducted from the bottom 3a and the bent portion 3b side to the upper side portion 3c through the inside of the wall, and the side where the induction heating portion is not provided. The temperature on the part 3c side also gradually increases.

  Further, in the above configuration, in addition to this, the ceramic outer hook 6 is also provided inside the protective frame 4 in which the inner hook 3 is accommodated, and the first and second induction heating portions G1 and G2 are connected to each other. The outer periphery of the inner pot 3 is covered with the outer pot 6 made of ceramic, so that the bottom 3a of the inner pot 3 and the induction heating parts G1 and G2 of the bent part 3b and the vicinity of the induction heating parts G1 and G2 are outward. The heat radiated to the outer pot 6 is cut off by the outer pot 6 made of the same ceramic, and the radiant heat radiated outward from the induction heating section G1 of the bottom 3a of the inner pot 3, the induction heating section G2 of the bent section 3b, and the vicinity thereof. Heats the inner hook 3 itself in such a way as to envelop the outer periphery of the inner pot 3, and the same heat is stored in the opposing surface portion between the outer hook 6 and the inner hook 3 and the gap S between them. High-temperature sky heated in a state (high temperature of about 200 ° C) There bottom 3a of the inner hook 3 through the gap S by convection, rises on the outer peripheral surface side of the side 3c from the outer peripheral surface side of the curved portion 3b, and the whole of the inner hook 3 the outer peripheral surface heating, so heated.

  As a result, the inner hook 3 reaches a relatively high temperature from the bottom 3a and the bent portion 3b side to the entire side portion 3c, and effectively stores the amount of heat. Therefore, the amount of heat generated in the first and second induction heat generating portions G1 and G2 can be used effectively.

  Moreover, in the case of the configuration of this embodiment, in that case, a third induction heat generating part G3 is further provided on the inner peripheral surface of the side portion of the outer hook 6 and corresponds to the third induction heat generating part G3. A third work coil C3, which is an electromagnetic induction means for inducing heat generation of the third induction heat generating part G3, is provided on the outer periphery of the side wall of the protective frame 4, and the side part 6c itself of the outer hook 6 is Heating is performed from the inner peripheral surface side.

  Therefore, the ceramic outer pot 6 is not only simply covered with the outer periphery of the bottom portion 3a side of the inner hook 3 so as not to release heat, as in the conventional case described above. The radiant heat from the outer pot 6 in the same high temperature state will heat the inner inner pot 3 positively with a slight gap S. The entire portion including the side portion 3c is effectively heated and heated.

  Moreover, the heating of the side portion 3c portion of the inner hook 3 is different from the case where the induction heating portion is directly provided in the side portion 3c portion of the inner hook 3, for example, and is heated at a predetermined distance from the outer pot 6 side. Since the inner hook 3 is heated by the radiant heat from the entire side portion 6c of the outer pot 6, the heating state becomes uniform, and the side portion of the inner pot 3 is heated. There is no possibility of causing scorching due to local heating as in the case of heating by directly providing an induction heating part in 3c and the like.

  Further, in the case of this embodiment, the side portion 6c of the outer hook 6 extends to the vicinity of the upper portion of the side portion 3c of the inner hook 3 and is located on the inner peripheral surface of the side portion 6c that is extended to be higher. The third induction heat generating part G3 is provided, and a third work coil C3 for inductively generating heat by the third induction heat generating part G3 is provided on the outer periphery of the side wall of the protective frame 4 corresponding to the third induction heat generating part G3. Is provided.

  Therefore, in the ceramic outer hook 6, the inner peripheral surface of the side portion 6c extended to a position corresponding to the upper portion of the side portion 3c of the inner hook 3 is efficiently heated to become a high temperature. The upper portion of the side portion 3c of the inner pot 3 which has been underheated is also effectively heated, and the entire inner pot 3 including the side portion 3c and the upper portion thereof is effectively heated and heated. Thus, the space portion of the upper part of the rice in the inner pot 3 is maintained at a high temperature state (near 120 ° C.) similar to the case of rice cake.

  In this case, the upper position of the side portion 3c of the inner pot 3 where the side portion 6c of the outer pot 6 is extended is, for example, that of the rice after completion of cooking determined from the rated rice cooking capacity of the electric rice cooker shown in FIG. It corresponds to the vicinity of the upper position. In such a case, it becomes possible to appropriately apply an appropriate and sufficient amount of heat similar to the case of rice cake to the upper space position of the rice after completion of cooking determined from the rated rice cooking capacity of the electric rice cooker, It is possible to cook more delicious rice without causing uneven cooking without causing burning.

  1 is a rice cooker body case, 1a is an outer case, 1b is a bottom case, 2 is a lid, 3 is an inner pot, 3a is a bottom part, 3b is a bent part, 3c is a side part, 3d is an opening part, and 4 is a protective frame 4A is the first protective frame unit, 4B is the second protective frame unit, 5 is the inner hook storage groove, 6 is the outer pot made of ceramic, 6a is the bottom, 6b is the bent portion, 6c is the side portion, and 6d is Side upper end, 7 is a magnetic shielding plate, 8 is a shoulder member, 9 is a coil base, C1 is a first work coil, C2 is a second work coil, C3 is a third work coil, and G1 is a first induction. A heat generating part, G2 is a second induction heat generating part, and G3 is a third induction heat generating part.

Claims (3)

  A ceramic inner pot having an induction heating part on the bottom side, a rice cooker body provided with an inner pot accommodating space in which the inner pot is accommodated, and provided in the inner pot accommodating space of the rice cooker body, A protective frame that forms a storage groove for the inner pot, a ceramic outer hook provided inside the protective frame, and a bottom outer periphery of the protective frame, and the inner pot is guided through the outer hook. An electric rice cooker comprising electromagnetic induction means for inductively generating heat at the heat generating portion and a lid body that can be opened and closed on the upper side of the inner pot storage groove of the rice cooker body, the inner peripheral surface of the outer pot The electric rice cooker is characterized in that an induction heating unit is provided on the outer periphery of the protective frame corresponding to the induction heating unit, and electromagnetic induction means for induction heating the induction heating unit is provided.   The side portion of the outer hook extends to the vicinity of the side portion of the inner hook, and an induction heating portion is provided on the inner peripheral surface of the extension portion, while the outer periphery of the side of the protective frame corresponding to the induction heating portion. 2. An electric rice cooker according to claim 1, further comprising electromagnetic induction means for inductively generating heat in the induction heat generating portion.   The side position of the inner pot in which the side part of the outer pot is extended is near the upper position of the cooked rice determined from the rated rice cooking capacity of the rice cooker. Electric rice cooker.

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