JP2011024747A - Inner pot for electromagnetic induction heating type electric rice cooker - Google Patents

Abstract

An inner pot of an electromagnetic induction heating type electric rice cooker formed of ceramics is a mounting surface on a sink or the like, and protrudes to the bottom wall part or the outer peripheral part side where things are easy to fall during washing etc. The flange part may hit the object and be missing. Further, in a clay pot having a rough surface as it is, steam leakage may occur from the flange portion which is a seal portion.
An electromagnetic induction heating type electric power comprising a ceramic with a glaze layer formed on the surface, a fluororesin coat layer provided on the inner peripheral surface thereof, and a heat generating member for electromagnetic induction heating provided on the outer peripheral surface. It is an inner pot of a rice cooker, and the fluororesin coat layer is thicker on the bottom wall than on the side wall.
[Selection] Figure 2

Description

  The present invention relates to an inner pot for an electromagnetic induction heating type electric rice cooker, and more particularly to a configuration of an inner pot of a ceramic type electromagnetic induction heating type electric rice cooker generally called a clay pot.

  Recently, in an electromagnetic induction heating type electric rice cooker equipped with an induction heating coil for induction heating the inner pot, an inner pot formed of carbon material or ceramic (ceramic material) has been provided (patent as an example of the former) Reference 1, refer to Patent Document 2 as an example of the latter).

  In the case of an inner pot made of carbon material, there is a problem that the flange portion protruding sideways is easily broken by impact or the like. Therefore, a proposal has been made to provide a reinforcing annular member on the outer periphery of the flange portion (see, for example, Patent Document 3).

  On the other hand, in the case of an inner pot made of ceramics, since the material itself is hard, no special reinforcing means has been adopted so far.

JP 2006-95283 A JP 2008-188219 A JP 2007-37634 A

  However, even in the case of an inner pot made of ceramics, the flange part of the lip protrudes to the side, so it is easy to collide with the object and it is easy to concentrate stress when it collides, so it will also break. It cannot be said that there is no fear. Moreover, generally the bottom wall part is formed thinly compared with the side wall part, and it is weak to the fall of the thing from upper direction (refer FIG. 1 of patent document 2).

  Therefore, in the case of the inner pot made of ceramics, some reinforcing means is still necessary for those portions.

  The present invention was made based on such circumstances, and in an inner pot for a ceramic-type electromagnetic induction heating type electric rice cooker generally called a clay pot, without adding special parts and complicating the structure. It aims at providing the inner pot for electromagnetic induction heating type electric rice cookers which improved intensity so that damage to the above-mentioned flange part and bottom wall part could be prevented.

  In order to achieve the above object, the present invention is configured with the following problem solving means.

(1) Invention of Claim 1 This invention consists of the ceramics which formed the glaze layer in the surface, and while providing the fluororesin coat layer in the inner peripheral surface side surface, the heat generating member for electromagnetic induction heating is provided in the outer peripheral surface side. It is an inner pot of the electromagnetic induction heating type electric rice cooker provided, Comprising: The said fluororesin coat layer is characterized by making the film thickness of the bottom wall part thicker than the film thickness of the side wall part.

  According to such a configuration, since the fluororesin coat layer on the thick bottom wall functions as a reinforcing member, an object is accidentally dropped on the bottom wall inside the inner pot when cleaning the inner pot. Even in such a case, damage such as chipping is less likely to occur in the inner pot bottom wall portion, and even if chipping occurs, the fragments are less likely to scatter.

  Moreover, when the thickness of the fluororesin coat layer is large, the durability of the fluororesin coat layer at the time of washing the rice becomes high, and the reliability becomes high. Further, the bottom wall portion is also a portion facing the heat generating member, and its durability increases, so that sticking of rice can be suppressed for a long time even if the number of times of rice cooking is increased.

  Furthermore, the heat insulating property is improved even with respect to heat radiation toward the lower surface side of the bottom wall portion where it is difficult to structurally provide a heat insulating material.

(2) Invention of Claim 2 This invention provides a heating member for electromagnetic induction heating on the outer peripheral surface side while providing a fluororesin coat layer on the inner peripheral surface side surface of the ceramic product on which the glaze layer is formed. It is an inner pot of an electromagnetic induction heating type electric rice cooker having a flange portion on the outer periphery of the side opening, and the film thickness of the flange portion is greater than the film thickness of the side wall portion. It is characterized by being thick.

  According to such a configuration, since the fluororesin coat layer of the thick flange portion functions as a reinforcing member, even if the inner pot is dropped or hit against an object, damage such as chipping is caused in the flange portion. In addition to being difficult to occur, even if chipping occurs, the fragments are less likely to scatter.

  In addition, when the flange portion is sealed with a seal member such as packing on the inner lid side, steam leakage may occur from the seal portion if the surface is rough as in an unglazed state. When the thickness of the fluorine coating layer is increased, the surface becomes smooth and the sealing property is improved, so that such vapor leakage can be prevented.

(3) Invention of Claim 3 In this invention, in the structure of the invention of Claim 1 or 2, a metal sprayed layer is provided on the surface of the glaze layer on the inner peripheral surface side, and the fluororesin coat layer comprises It is characterized by being provided on the surface of the metal sprayed layer.

  With such a configuration, first, the same reinforcing action as that of the invention of claim 1 or 2 is obtained.

  Moreover, in that case, a predetermined glaze layer is formed on the inner peripheral surface of the base body of the inner pot, a metal sprayed layer is formed thereon, and a fluororesin coat layer is formed on the upper surface of the metal sprayed layer. Therefore, the adhesion of the fluororesin coat layer to the metal sprayed layer can be greatly improved, and the reliability and durability can be improved while effectively preventing the sticking and scorching of rice. Can do.

(4) Invention of Claim 4 This invention is a structure of invention of the said Claim 1, 2 or 3, An inner pot is a curved surface part between the bottom wall part which is a horizontal part, and the side wall part which is a perpendicular part. A certain curved wall portion is provided, and the side wall portion is formed thicker than the wall thickness of the bottom wall portion.

  If comprised in this way, the thermal storage property of a side wall part will become high, and the uneven | corrugated efficiency at the time of unevenness and the heat retention performance at the time of heat insulation will improve. Moreover, since the strength of the bottom wall portion is lower than that of the side wall portion and is easily chipped as it is, the reinforcing effect by increasing the film thickness of the fluororesin coat layer is particularly effective.

  As a result of the above, according to the present invention, even when an impact due to a fall of an object or other causes is applied to a bottom wall portion or a flange portion which is a portion that is susceptible to impact, damage such as chipping is less likely to occur. Therefore, the heat insulation against heat radiation downward from the bottom surface of the bottom wall where it is difficult to structurally provide a heat insulating material is also improved. Moreover, since the surface becomes smooth and the sealing performance is improved by increasing the film thickness of the fluorine coat layer in the flange portion, it is possible to have an effect of preventing vapor leakage.

It is a longitudinal cross-sectional view which shows the structure of the electromagnetic induction heating type electric rice cooker which concerns on embodiment of this invention. It is a figure which shows the cross-section of the inner pot for the electromagnetic induction heating type electric rice cookers. It is an expanded sectional view which expands and shows a part of section structure of the inner pot.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings for understanding of the present invention. The following description is merely a specific example of the present invention and does not limit the scope of the claims.
(Overall configuration of electric rice cooker)
First, FIG. 1 is a sectional view showing a configuration of an electromagnetic induction heating type electric rice cooker according to an embodiment of the present invention. The electromagnetic induction heating type electric rice cooker 1 is composed of a main body 2 having an upper portion opened and a lid portion 3 that can be rotated with a rear end side as a fulcrum, so that the inner pot 4 can be attached to and detached from the main body 2. Has been. As a heating means at the time of rice cooking with respect to the inner pot 4, the curved wall part 4 c is formed from the bottom wall part 4 d of the inner pot 4 through an inner case 6 made of synthetic resin provided at a predetermined interval in the outer case 5. Are provided with work coils 7a and 7b for electromagnetic induction heating, and a heating heater H corresponding to the entire circumference of the side wall portion 4b of the inner pot 4 is provided as a heating means for keeping the inner pot 4 warm. It has been.

  And the opening part on the upper surface side of this electric rice cooker 1 is provided with the cover part 3 which opens and closes in the front-back direction via the hinge part 8 provided in the rear end side of the shoulder member 7. As shown in FIG.

  The lid portion 3 constitutes the outer peripheral surface of the upper side and has an outer cover 10 made of a synthetic resin provided with a concave portion 10a for installing the pressure adjusting member 9 at the center, and a lower surface side of the outer peripheral portion of the outer cover 10. A synthetic resin inner cover 13 is provided which is integrally formed and in which a circular heat radiating plate 12 made of a metal having good heat conductivity is joined through a steam seal packing 11 in a circular opening on the inner peripheral side thereof. Has been. On the upper surface of the heat radiating plate 12, a lid heater (not shown) is disposed over the entire circumferential surface, and rice is passed through a metal inner lid 21 such as aluminum that closes the opening of the inner pot 4. Is heated from above.

  A seal member 22 that seals the opening between the inner lid 21 and the flange portion 4 a of the inner pot 4 is mounted.

  On the other hand, timer reservation for each function of rice cooking / cooking / warming of the electric rice cooker 1, rice cooking and warming menu, selection of heating cooking menu, heating amount corresponding to each menu, heating pattern, warming temperature, warming time, etc. The selection setting operation is performed by the user through various input switch groups (operation key groups) provided on the front side operation panel unit 14 of the rice cooker body 1, and finally the workpiece is selected according to the selection setting contents. The coils 7a and 7b, the heat retaining heater H, and the lid heater are appropriately driven and controlled.

  And in the state where the inner pot 4 is stored and set in the main body 2 of the electric rice cooker 1, when the rice cooking operation is started by, for example, an ON operation of the rice cooking start switch, the work coils 7a and 7b are followed according to a predetermined procedure. Is supplied with a high frequency current, and the alternating magnetic field generated in the work coils 7a and 7b couples the heat generating members 27a and 27b of the inner pot 4 facing the work coils 7a and 7b so as to be capable of electromagnetic induction, and an eddy current flows. .

  The heat generating members 27a and 27b generate heat due to the Joule heat caused by the eddy current, and the heat is transmitted to the inner pot 4 inside the heat generating members 27a and 27b, thereby heating the rice and water in the inner pot 4. At this time, a part of the heat passes from the bottom wall portion 4d of the inner pot 4 to the curved wall portion 4c, from the curved wall portion 4c to the side wall portion 4b, and from the side wall portion 4b to the flange portion 4a. The whole inner pot 4 is warmed and the rice and water in the inner pot 4 are heated uniformly.

  An operation board cover 16 holding an operation board (display board) 15 is inclined in a parallel manner to the operation panel 14 at an inner portion (back space portion) of the operation panel section 14 of the outer case 2. is set up.

  On the other hand, a coil cover (coil base) 17 having a ferrite core is provided on the lower side of the bottom wall portion of the inner case 6, and work coils 7 a each having litz wires wound concentrically on the upper portion thereof. 7b is provided.

  An IH circuit provided with the work coils 7a and 7b and a driving IGBT on the front side of the side wall (and the coil cover 17) of the inner case 6, an IGBT driving circuit for driving the IGBT of the IH circuit, A control board 18 having various circuits such as a heater drive circuit for driving and controlling a heat retaining heater, a lid heater and the like, a diode bridge for power supply voltage rectification, and a rectifying and smoothing circuit comprising a CR circuit, and a control board holding the control board 18 A cover 19 is positioned between the inner case 6 and the outer case 2 and is erected in the vertical direction.

  At the center of the dish-shaped bottom wall portion of the inner case 6 is provided a center sensor S having a thermistor as temperature detecting means for detecting the temperature of the inner pot 4 at the center of the bottom surface.

  In addition, an inlet for cooling air having a lattice structure is formed on the front side of the bottom wall of the outer case of the rice cooker body 1, and for cooling the electrical components and the like on the upper side of the inlet of the cooling air. The cooling air from the cooling fan 20 for cooling the electrical equipment and the like is introduced into a necessary portion in the rice cooker body 2.

(Inner pot structure)
Next, FIG. 2 is a view for explaining the structure of the inner pot 4. The inner pot 4 is an inner pot for the above-described electromagnetic induction heating type electric rice cooker, which is generally referred to as an earthen pot as described above, and the inner pot body (base portion) 4a to 4d has a high heat-resistant temperature and is kept warm. It is made of a cordierite-based ceramic material having good heat storage at the time, and is formed into a bottomed cross-sectional shape having a flange portion 4a on the periphery of the opening.

  The flange portion 4a of the inner pot 4 is slightly swelled in the inner diameter direction, provides a sufficient pressure contact surface with the seal member 22 provided on the outer periphery of the metal inner lid 21 such as aluminum, and is formed by molding or firing the pot. Even if there is a dimensional error, steam leakage between the upper end opening by the inner lid 21 can be prevented. However, in an earthenware pot with a rough surface, steam leakage may occur from the seal portion. Therefore, the film thickness of the fluororesin coat layers 26a and 26b, which will be described later, is smaller than that of the other portions. Since the surface is smoothed and the sealing property is improved by increasing the thickness, steam leakage can be prevented.

  By the way, in this Embodiment, what is called a ceramic pot is employ | adopted as the inner pot 4 as mentioned above. As described above, in the case where the earthenware pot is used for the inner pot 4, it is difficult to cool once the temperature is raised, but the heat conductivity during heating is poor. Therefore, in the inner pot 4 used in this kind of electromagnetic induction heating type electric rice cooker, the thickness of the bottom wall portion 4d and the rounded curved wall portion 4c at the lower portion of the inner pot 4 is set to the side wall portion 4b. The heat from the heat generating members 27a and 27b is quickly conducted to the inner surface of the inner pot 4. On the other hand, the thickness of the flange part 4a and the side wall part 4b of the inner pot 4 is made comparatively thick since it should be gradually warmed at the time of rice cooking and then exhibit sufficient heat storage. In particular, a thick flange edge 4e is formed on the outer peripheral portion of the flange portion 4a to further improve the heat storage effect.

  That is, when the thickness of the flange part 4a and the side wall part 4b of the inner pot 4 is increased in this way, the temperature rise is delayed, but the amount of heat stored at the completion of cooking is increased and it is difficult to cool down. The uneven efficiency (or heat retention efficiency in the heat retention process) is improved. In addition, about the thin inner-pan lower part 4d, the heat insulation is improved with respect to the downward heat radiation by making the fluororesin coat layer mentioned later thicker than the side wall part 4b.

  The inner pot 4 shown in FIG. 2, for example, as shown in an enlarged view in FIG. 3, is in an unfired state extending from the bottom wall portion 4d, which is a central flat surface, to the curved wall portion 4c, the side wall portion 4b, and the flange portion 4a. First, a lithia-based glaze layer 24 having a desired thickness is formed on the inner peripheral surface of the pan body (base material) (or on the outer peripheral surface if necessary), thereby preventing the inner pan body portion from passing through at low cost. Realizes water.

  Then, as a first ground treatment for forming a fluororesin coat layer 26a (primer) and 26b (top), which will be described later, a simple thermal spraying machine such as an arc spraying machine is used to spray aluminum metal ( Spraying) to form an aluminum sprayed layer 25 on the surface of the glaze layer 24. In order to improve the heating performance on the side of the bottom wall portion 4d and improve the heating efficiency on the center portion side of the inner pot, thereby forming an effective outer convection in the aluminum sprayed layer 25, the curved wall portion By polishing or blasting the surface of the metal spray layer on the 4c side, the surface is smoothed to a predetermined level and its roughness is lowered.

  Then, a liquid fluororesin paint composed of an adhesive component, a pigment and the like is further applied to the surface of the aluminum sprayed layer 25 and dried to form a fluororesin primer coat layer 26a. After this fluororesin primer coat layer 26a is formed, the inner pot side wall 4b is pad printed with a water scale on the inner surface in a color different from that of the fluororesin primer coat layer 26a, and then PFA (tetrafluoroethylene and perfluoroalkyl). After coating a powdery fluororesin paint composed of a copolymer with perfluorovinyl), etc., baking is performed to form a fluororesin topcoat layer 26b with a desired thickness, thereby sticking rice and burning it. An inner pot 4 is formed that does not have. Here, in the fluororesin primer coat layer 26a and the fluororesin topcoat layer 26b, the flat portion which is the pressure contact surface of the bottom wall portion 4d and the flange portion 4a with the heat radiation plate 21 side seal member 22 is formed on the side wall portion 4b. In order to increase the coating amount, the coating is concentrated on the same part to ensure a thick film thickness.

  On the other hand, a heating member 27a for induction heating is provided on the lower surface side (outer peripheral surface side) of the bottom wall portion 4d of the inner pot 4, and a heating member for induction heating is provided on the curved wall portion 4c having a rounded surface shape continuous to the side wall portion 4b. 27b is provided. These heating members 27a and 27b are capable of self-heating by eddy currents induced by the work coils 7a and 7b of the electric rice cooker body, such as a metal induction heating sheet such as silver paste, stainless steel (SUS430), etc. These metal materials are sprayed using an arc sprayer so as to have a porous cross-sectional structure, and are formed of a metal sprayed layer formed to have a desired thickness.

  The heating member is not particularly limited as long as it generates heat by electromagnetic induction.

  As mentioned above, it coats so that the coating amount of the bottom wall part 4d and the flange part 4a may increase the film thickness of the fluororesin coat layers 26a and 26b of the inner pot 4, and the film thickness compared with the side wall part 4b. The bottom wall 4d and the flange 4a of the inner pot 4 are protected and strengthened by the thick fluororesin layer having the same thickness (relaxation of the impact angle due to the high slidability of the fluororesin film and its It is a case where the impact force due to the large film thickness is absorbed), and the chipping due to the impact at the time of dropping or the like is difficult to occur at each part, and the chipping is temporarily caused by the laminating effect of the fluororesin film. Even the debris can be made difficult to scatter.

  Further, since the fluororesin coat layers 26a and 26b on the inner pot bottom wall portion 4d are thick, the durability of the fluororesin coat layers 26a and 26b at the time of washing the rice is high and reliable.

  In addition, in an electric rice cooker that seals the flange portion 4a with a sealing member 22 such as packing, in a clay pot having a rough surface unlike a metal material, steam leakage may occur from the seal portion. By increasing the film thickness of the fluororesin coat layers 26a and 26b on the pressure contact surface of the flange portion 4a with the seal member 22, the surface can be made smoother and the sealing performance is further improved. Steam leakage can be prevented more effectively.

  In addition, in that case, a predetermined glaze layer 24 is formed on the inner peripheral surface of the base body of the inner pot 4, a metal spray layer 25 such as aluminum is formed thereon, and then a fluorine is formed on the upper surface of the metal spray layer 25. Since the resin coat layers 26a and 26b are formed, the adhesion of the fluororesin coat layers 26a and 26b to the metal sprayed layer 25 can be greatly improved, and the effect of preventing sticking and scorching of rice is effectively exhibited. Thus, the above-described action can be obtained more effectively, and the reliability and durability can be further improved.

  2 is an outer case, 3 is a lid, 4 is an inner pot, 7a and 7b are work coils, 23 is an inner pot base material, 24 is a glaze layer, 25 is an aluminum sprayed layer, 26a is a fluororesin primer coat layer, and 26b is The fluororesin topcoat layers 27a and 27b are heat generating members.

Claims (4)

  The inside of an electromagnetic induction heating type electric rice cooker made of a ceramic product having a glaze layer formed on its surface, and provided with a fluororesin coat layer on its inner peripheral surface, and a heating member for electromagnetic induction heating on its outer peripheral surface An inner pot for an electromagnetic induction heating electric rice cooker, characterized in that the fluororesin coat layer has a thicker bottom wall than a side wall.   While a fluororesin coat layer is provided on the inner peripheral surface side surface of the ceramic product having a glaze layer formed on the surface, a heating member for electromagnetic induction heating is provided on the outer peripheral surface side, and a flange portion is provided on the outer periphery of the upper surface side opening. An electromagnetic induction heating type electric rice cooker, wherein the fluororesin coat layer has a thicker flange portion than a side wall portion. An inner pot for rice cookers.   3. The electromagnetic induction according to claim 1, wherein a metal spray layer is provided on the surface of the glaze layer on the inner peripheral surface side, and the fluororesin coat layer is provided on the surface of the metal spray layer. Inner pot for heating electric rice cooker.   The inner pot is provided with a curved wall portion that is a curved portion between a bottom wall portion that is a horizontal portion and a side wall portion that is a vertical portion, and the side wall portion is formed thicker than the wall thickness of the bottom wall portion. The inner pot of the electric rice cooker according to claim 1, 2, or 3.

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