JP2009000246A - Rice cooker and warmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner pot in an electromagnetic induction heating rice cooker, capable of improving the exothermic efficiency in the induction heating, capable of improving the electromagnetic induction heating performance, and capable of being inexpensively manufactured. <P>SOLUTION: The rice cooker includes a body 1, a protection frame 3 constituting the inner wall of the body 1, the inner pot 4 detachably stored inside the protection frame 3, a bottom heating coil 5 disposed outside the protection frame 3 to induction-heat the inner pot 4, and an outer lid 2 to close the upper openings of the body 1 and the inner pot 4. The inner pot 4 is constituted by a clad material consisting of an aluminum plate 7 on the inner side and an aluminum-plated steel plate 10 on the outer side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a jar rice cooker that cooks rice by heating an inner pot by electromagnetic induction heating.

  The electromagnetic induction heating type jar rice cooker uses a magnetic material that is induction heated by an induction heating coil on the outside as the material of the inner pot, and heat from the magnetic material generated by induction heating on the inside is the rice inside the inner pot. It is common to use materials with good thermal conductivity so that they can be evenly transmitted to them. As shown in Patent Document 1, a clad material with a stainless steel plate on the outside and an aluminum plate on the inside is used. Many are drawn into a pot shape.

  Moreover, as shown in Patent Document 2, a dish-shaped stainless steel plate or the like, which is a magnetic metal material, is laid on the bottom surface of a receiving mold having an inner pot shape, and molten aluminum, which is a nonmagnetic metal material, is injected thereon, There is also a type in which an inner pan is molded by pressing from above with high pressure.

  Furthermore, in order to increase the efficiency of induction heating, as shown in Patent Document 3, iron having the best electromagnetic induction heating efficiency is thermally sprayed on the outer bottom surface portion of the inner pot in which an aluminum plate is drawn, and further, iron spraying is performed. In order to prevent rusting of the surface, there is also one in which aluminum is sprayed so as to cover the iron sprayed surface.

JP-A-5-199934 JP-A-8-24123 JP 2003-290022 A

  In the above-mentioned electromagnetic induction heating type jar rice cooker, it is ideal to use the iron with the best heat generation efficiency for the heat generating part of the inner pot, but since the inner pot is always used around water, There is a problem, and as described above, a nonmagnetic material is used on the inner side and a magnetic material is used on the outer side as shown in Patent Documents 1, 2, 3, and the like.

  Among them, what is shown in Patent Document 1, which is currently mainstream, is only drawn into an inner pot shape using a clad material with a stainless steel plate on the outside and an aluminum plate on the inside. Although there is an advantage that the processing cost is low, there is a drawback that the heat generation efficiency of the stainless steel plate, which is a magnetic material, is about 78%, which is lower than about 84% of iron, which is a ferromagnetic material.

  In addition, in the actual production of the one shown in Patent Document 2, since the magnetic metal material needs to have a strength that can withstand high-pressure melt forging, iron that is a strong magnetic material cannot be used, and is limited to a stainless steel plate. For this reason, there is a drawback that the heat generation efficiency is poor as in the above-mentioned Patent Document 1.

  Further, depending on the shape of the inner pot, there is a concern that the dish-shaped stainless steel plate may be peeled off from the aluminum material, and further, since it is high-pressure melt forging, there is a disadvantage that the production cost is great and cannot be provided to consumers at low cost.

  Furthermore, in the case of the one shown in Patent Document 3, innumerable rough irregularities are formed on the sprayed surface after iron spraying, so there is a risk of damaging the sink or the like in the state as it is. After spraying, it is necessary to polish the sprayed surface, and there is a drawback that the processing cost is increased as compared with the clad material.

  In addition, it is difficult to manage the film thickness by spraying, and if weight management of spraying is performed instead of film thickness management, a weight variation of about 10% of the target value occurs, and the heat generation amount of electromagnetic induction heating, that is, product consumption An error is likely to occur in the power.

  Further, in recent years, in order to improve the uniform heating property of rice, an induction heating coil is sometimes provided on the side portion of the inner pot, and if the thermal spraying is performed to the side surface of the inner pot, the processing cost is further increased.

  The present invention has been made to solve the above-mentioned problems. In claim 1, the main body, a protective frame constituting the inner wall of the main body, and an inner hook removably accommodated in the protective frame, A jar rice cooker provided with an induction heating coil arranged on the outside of the protective frame to inductively heat the inner pot, and an outer lid for closing the upper surface opening of the main body and the inner pot, the inner pot being an aluminum plate The outer side is made of a clad material made of an aluminized steel sheet.

  According to a second aspect of the present invention, the thickness of the aluminum plating layer of the aluminized steel sheet is 30 μm or more.

  According to claim 1 of the present invention, since the inner pot is a clad material of the inner aluminum plate and the outer aluminum plated steel plate, the aluminum plated steel plate is a ferromagnetic material, so the heat generation efficiency of induction heating is high, The electromagnetic induction heating performance can be improved.

  Further, the processing cost is equivalent to that of a conventional clad material made of an aluminum plate and a stainless steel plate, and can be manufactured at low cost.

  In addition, by using the clad material as described above, variation in weight can be suppressed as compared with iron spraying, and the amount of heat generated by electromagnetic induction heating, that is, power consumption error can be eliminated, and power consumption can be easily managed. is there.

  Furthermore, since the outer surface of the inner pot is covered with an aluminum plating layer, there is no fear of iron rust.

  Moreover, since the entire outer surface of the inner pot is covered with an iron plate, the side surface can be heated sufficiently, and the rice can be heated uniformly.

  According to claim 2, since the thickness of the aluminum plating layer of the aluminum plating steel plate to be clad is 30 μm or more, the iron plate is sufficiently protected and there is no fear of iron rust.

  An embodiment of the present invention will be described below with reference to FIG.

  In FIG. 1, a protective frame 3 having an open upper surface is provided inside a main body 1 of a jar rice cooker, and an inner pot 4 is detachably accommodated in the protective frame 3.

  An outer lid 2 is attached to the upper surface of the main body 1 so as to be openable and closable, and closes the upper surface openings of the main body 1 and the inner hook 4.

  A bottom heating coil 5 for induction heating the bottom surface of the inner pot 4 and a side heating coil 6 for induction heating the side surface are provided on the outer bottom surface and the outer side surface of the protective frame 3.

  The inner hook 4 is clad with an aluminum plated steel plate 10 having an aluminum plating layer 9 applied to both surfaces of an aluminum plate 7 having a thickness of 1.8 mm and an iron plate 8 having a thickness of 0.5 mm. The clad material is drawn into an inner hook shape so that the aluminum plate 7 is positioned inside the inner pot 4 and the aluminum-plated steel plate 10 is positioned outside, and then the inner surface of the inner pot 4 is blast shot processed, Primer 11 is coated on the surface, and fluororesin 12 is coated on primer 11. Thereafter, a blast shot is performed on the outer surface of the inner pot 4 and a heat-resistant paint 13 having a rust-proofing power such as silicon resin is applied to the surface.

  The operation of this embodiment having the above configuration will be described.

  In FIG. 1, first, the user puts an appropriate amount of rice and water into the inner pot 4, accommodates the main body 1, and closes the outer lid 2.

  Next, when rice is cooked by operating the operating means (not shown), an electric current flows through the bottom surface heating coil 5 and the side surface heating coil 6, an alternating magnetic field is generated, and the aluminum plating facing the heating coils 5, 6 An eddy current flows through the iron plate 8 of the steel plate 10, and electromagnetic induction heating occurs due to Joule heat generated by the eddy current. And the heat which generate | occur | produced in the iron plate 8 is transmitted to the rice and water inside the inner pot 4 through the aluminum plate 7 with good heat conduction, and rice cooking is performed.

  Eventually, when the rice sucks water and the water in the inner pot 4 runs out, the temperature at the bottom of the inner pot 4 suddenly rises, and this is detected by a temperature detecting means (not shown), and the bottom heating coil 5 and the side surface heating. The energization to the coil 6 is stopped and the heating is finished. After that, steaming is performed for a certain period of time, and cooking is completed.

  In the rice cooker, in the present invention, the inner pot 4 is made strong on the entire surface of the inner pot 4 by using the clad material of the aluminum-plated steel sheet 10 in which the aluminum plating layer 9 is provided on both surfaces of the aluminum plate 7 and the iron plate 8. An iron layer having the highest heat generation efficiency of induction heating is formed of a magnetic material, and this improves the heat generation efficiency of electromagnetic induction heating and improves the electromagnetic induction heating performance.

  Moreover, since it can respond also to both the bottom face heating coil 5 which induction-heats the bottom face part of the inner pot 4, and the side surface heating coil 6 which induction heats a side part, the improvement of the uniform heating property of rice can be aimed at.

  Further, the iron plate 8 has a heat storage property, and by providing an iron layer on the entire peripheral surface, the amount of heat released during heat retention is small, leading to an energy saving effect.

  In addition, in order to improve the appearance of the outer surface of the inner pot 4 on which the aluminum plating layer 9 is applied, when the outer surface is coated, the outer surface is used to increase the adhesion of the coating before coating. The blast shot is roughened and then coated, but the roughness of the blast shot is about 5 to 10 μm. In the present invention, the aluminum plating layer is secured to 30 μm or more, and even when blast shot is performed, 20 μm or more Because there is no aluminum plating layer, there is no worry about iron rust.

  Further, the inner hook 4 is made of a clad material made of an aluminum-plated steel plate 10 having an aluminum plating layer 9 on both sides of an aluminum plate 7 and an iron plate 8, and then the inner hook and the outer side of the inner pot 4 are painted. Therefore, the number of processing steps does not increase as in the conventional sprayed inner pot, and the production cost does not increase as in the high pressure fusion forging pot.

  In the above-described embodiment, the aluminum plate 7 having a thickness of 1.8 mm and the iron plate 8 having a thickness of 0.5 mm are used as the clad material of the inner hook 4. In consideration of the above, it is not necessarily limited to the plate thickness, and can be appropriately selected.

It is a longitudinal cross-sectional view of the jar rice cooker of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Outer lid 3 Protective frame 4 Inner hook 5 Bottom heating coil 6 Side heating coil 7 Aluminum plate 8 Iron plate 9 Aluminum plating layer 10 Aluminum plating steel plate 11 Primer 12 Fluoro resin 13 Heat resistant paint

Claims (2)

  A main body, a protective frame that constitutes an inner wall of the main body, an inner hook that is detachably housed in the protective frame, an induction heating coil that is disposed outside the protective frame and induction-heats the inner hook, and the main body And a jar rice cooker provided with an outer lid that closes the upper surface opening of the inner pot, wherein the inner pot is made of a clad material made of an aluminum plate on the inner side and an aluminum-plated steel plate on the outer side.   The jar rice cooker according to claim 1, wherein the thickness of the aluminum plating layer of the aluminum plating steel sheet is 30 µm or more.

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