JP2008194111A - Inner pot for electric rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent sticking and burning of rice as far as possible while maintaining water impermeability of the inner pot. <P>SOLUTION: In the inner pot for an electric rice cooker including inner pot bodies 1a-1d composed of a non-metallic material, a water impermeable glaze layer 4 applied to the inner peripheral surface and outer peripheral surface of the inner pot bodies 1a-1d, a non-adhesive coating layer 5 formed by applying a coating excellent in a non-adhesive property to the inner peripheral surface of the inner pot bodies 1a-1d and a heating member 2 for induction heating provided on the outer peripheral surface of the inner pot bodies 1a-1d, a surface treated layer 6 composed by executing surface treatment for improving the contact of the coating excellent in the non-adhesive property is formed on the surface of the glaze layer 4 applied to the inner peripheral surface of the inner pot bodies 1a-1d, and the coating (for instance, fluororesin) excellent in the non-adhesive property is applied to the surface of the glaze layer 4 applied to the inner peripheral surface of the inner pot bodies 1a-1d with the excellent contact. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inner pot for an electric rice cooker, and more particularly to an inner pot for an electric rice cooker made of a non-metallic material.

  An electric rice cooker comprising: a rice cooker main body in which an inner pot is stored; and an induction heating coil that is arranged so as to oppose the outer peripheral surface of the inner pot and induction-heats the inner pot. There is a ceramic material having a high heat storage property or a mixed material of ceramic and glass, and a heating member made of a magnetic material is bonded to at least a portion facing the induction heating coil on the outer peripheral surface of the inner pot.

  In such an inner pot, the vitreous glaze made of, for example, lithium-based crystallized glass is used on the inner peripheral surface side so that the inner peripheral surface is smooth and glossy and does not cause sticking or scorching of rice. Or a fluororesin coating process (see, for example, Patent Document 1).

  In the inner pot having such a configuration, when the rice cooking operation is started by the ON operation of the rice cooking start switch, a high-frequency current is supplied to the induction heating coil according to a predetermined procedure. And by the alternating magnetic field which generate | occur | produces in the said induction heating coil, the heating member which consists of a magnetic material arrange | positioned by the outer peripheral surface of the inner pot of the part facing the induction heating coil magnetically couples, and an eddy current flows.

  And the heating member generates heat by Joule heat due to this eddy current, and the heat is transmitted to the inner pot on the inner side of the heating member, or a vitreous glaze layer applied to the inner peripheral surface side of the inner pot, or Rice and water are heated through the fluororesin coating layer. At this time, a part of the heat is transmitted from the bottom part of the inner pot to the side wall part through the inner pot base material, the whole inner pot is warmed, and rice and water are heated uniformly.

  At this time, because the inner pot base material is composed of a ceramic material or a mixed material with glass, the taste of rice is improved and the heat storage property is improved, and the heating energization time at the time of heat insulation can be shortened. Savings.

  In addition, since the inner peripheral surface of the inner pot is coated with a glassy glaze or fluororesin coating, a certain level of water repellency is ensured, so that an inner pot that is less likely to adhere to rice will be obtained. Is guessed.

JP-A-2005-413.

  As mentioned above, the current inner glaze or top coat in the inner pot such as fluororesin coating has two purposes: to suppress water absorption into the inner pot made of ceramic base material, and to suppress sticking of rice and scorching. However, aside from the non-water-passing function, it is still not satisfactory for avoiding sticking of rice and burning.

  In addition, when the glaze is simply applied to the unglazed surface portion of the ceramic base material and coated with the fluororesin, the glaze and the fluororesin may be peeled off from the surface of the base material as described in the above-mentioned patent document.

  These problems are the same when, for example, the inner pot body is formed using a cordierite clay material known as a ceramic-forming material having a high heat-resistant temperature.

  This invention is made | formed in view of said point, and it aims at making it possible to prevent sticking of rice and scorching as much as possible, maintaining the water-imperviousness of the inner pot.

  In the present invention, as a first means for solving the above problems, an inner pot body made of a non-metallic material, a non-water-permeable glaze layer applied to the inner peripheral surface and the outer peripheral surface of the inner pot body, It consists of a non-adhesive paint layer formed by applying a non-adhesive paint on the inner peripheral surface of the inner pot body, and a heating member for induction heating provided on the outer peripheral surface of the inner pot body. In the inner pot for an electric rice cooker, a surface treatment layer is formed by applying a surface treatment to the surface of the glaze layer applied to the inner peripheral surface of the inner pot body to enhance the adhesion of the paint having excellent non-adhesiveness. Forming.

  By configuring as described above, the presence of the surface treatment layer that is subjected to a surface treatment for enhancing the adhesion of the paint having excellent non-adhesiveness, the glaze layer applied to the inner peripheral surface of the inner pan body A coating having excellent non-adhesiveness (for example, a fluororesin) can be applied to the surface with good adhesion, and rice sticking and scorching can be effectively prevented while maintaining non-water permeability.

  In the present invention, as a second means for solving the above problems, in the inner pot for an electric rice cooker provided with the first means, the surface treatment layer is a sand blast layer obtained by sand blast treatment. In such a configuration, a non-adhesive paint (for example, a fluororesin) has good adhesion by simply sandblasting the surface of the glaze layer applied to the inner peripheral surface of the inner pot body. Can be applied.

  In the invention of the present application, as a third means for solving the above-mentioned problems, in the inner pot for an electric rice cooker provided with the first means, the surface treatment layer is formed by applying a lithia glaze. It can also be made into a system glaze layer, and in such a case, it is possible to apply a lithia system glaze to the surface of the glaze layer applied to the inner peripheral surface of the inner pot body, and to achieve a non-adhesive paint ( For example, a fluororesin) can be applied with good adhesion.

  In the present invention, further, as a fourth means for solving the above problems, in the inner pot for the electric rice cooker provided with the first, second or third means, on the inner peripheral surface of the inner pot body, In addition to forming a printed display for the water scale, it is also possible to use a transparent paint that is excellent in non-adhesiveness to be applied. In such a case, the printed display for the water scale has excellent wear resistance. Since it is covered with a paint, it never disappears even if it is used for many years, and it becomes visible from the outside in a state of being lifted up by the refraction of light through a transparent paint.

  According to the first means of the present invention, the inner pot body made of a non-metallic material, the non-water-permeable glaze layer applied to the inner and outer peripheral surfaces of the inner pot body, and the inner pot body In an inner pot for an electric rice cooker comprising a non-adhesive paint layer formed by applying a paint having excellent non-adhesiveness to the peripheral surface, and a heating member for induction heating provided on the outer peripheral surface of the inner pot body The surface treatment layer is formed on the surface of the glaze layer applied to the inner peripheral surface of the inner pot body by applying a surface treatment for enhancing the adhesion of the paint having excellent non-adhesive properties. Due to the presence of a surface treatment layer that has been subjected to a surface treatment to enhance the adhesion of the paint with excellent properties, the paint with excellent non-adhesiveness on the surface of the glaze layer applied to the inner peripheral surface of the inner pot body ( (For example, fluororesin) can be applied with good adhesion, so that water permeability cannot be maintained. Et al., There is an effect that rice sticking and burning can be effectively prevented.

  As in the second means of the present invention, in the inner pot for an electric rice cooker provided with the first means, the surface treatment layer can be a sand blast layer obtained by sand blast treatment, and is configured as such. In this case, a paint (for example, a fluororesin) excellent in non-adhesiveness can be applied with good adhesion simply by subjecting the surface of the glaze layer applied to the inner peripheral surface of the inner pot body to sandblasting.

  As in the third means of the present invention, in the inner pot for an electric rice cooker provided with the first means, the surface treatment layer may be a lithia glaze layer formed by applying a lithia glaze. When configured in such a way, simply apply a Lithia glaze to the surface of the glaze layer applied to the inner peripheral surface of the inner pot body, and adhere to a non-adhesive paint (for example, a fluororesin). Can be applied well.

  As in the fourth means of the present invention, in the inner pot for an electric rice cooker provided with the first, second or third means, a printed display for a water scale is formed on the inner peripheral surface of the inner pot body. In addition, it is possible to use a transparent paint that is excellent in non-adhesiveness to be applied, and when configured as such, the printed display for the water scale is covered with a paint having excellent wear resistance, Even if it is used for many years, it never disappears, and it becomes visible from the outside in a state of being lifted by refraction of light through a transparent paint.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

1st Embodiment FIGS. 1-4 shows the structure of the inner pot for electric rice cookers concerning the 1st Embodiment of this invention.

  This inner pot 1 is an inner pot of the type generally referred to as an earthen pot as described above. For example, the inner pot main body 1a to 1d which is the center has a high heat-resistant temperature at the time of sintering, and heat storage properties at the time of heat-retaining. Made of cordierite-based ceramic material.

  The first heating member 2a located on the inner peripheral side and the second heating member 2b located on the outer peripheral side are joined and integrated to the bottom 1a, and connected to the side wall 1c from the bottom 1a. A third heating member 2c is joined and integrated on the outer surface side of the curved corner portion 1b.

  Each of the first to third heating members 2a to 2c is, for example, a member capable of self-heating by an eddy current induced inside by an induction heating coil on the rice cooker body described later, for example, a metal such as silver paste It consists of an induction heating sheet.

  And this inner pot 1 is arrange | positioned so that the outer peripheral surface of the said inner pot 1 may be opposed to the rice cooker main body which the same inner pot 1 is accommodated, and the induction heating coil which carries out the induction heating of the said inner pot 1; It is set and used in the said rice cooker main body of the electric rice cooker provided with.

  In the set state, for example, when the rice cooking operation is started by turning on the rice cooking start switch, a high-frequency current is supplied to the induction heating coil according to a predetermined procedure, and the induction magnetic coil generates the same induction by the alternating magnetic field generated in the induction heating coil. The first to third heating members 2a to 2c facing the heating coil are magnetically coupled, and an eddy current flows.

  And the said 1st-3rd heating members 2a-2c generate | occur | produce by the Joule heat by this eddy current, The heat is transmitted to the inner pot 1 inside the 1st-3rd heating members 2a-2c, The rice and water in the inner pot 1 are heated. At this time, a part of the heat is transmitted from the bottom 1a of the inner pot 1 to the corner 1b and the side wall 1c through the inner pot 1 base material, and the entire inner pot 1 is warmed to uniformly heat rice and water. .

A heat insulating heater is provided on the outer periphery of the side wall portion 1c as necessary. And this side wall part 1c is thicker than the said bottom part 1a and the corner part 1b, and the heat insulation property is high. As already stated, in the case of the current inner pot, Surface treatment such as glaze application or fluororesin coating is applied to the inner peripheral surface of the inner pot, which is intended to suppress water absorption into the inner pot made of various ceramic base materials, and to suppress sticking and scorching of rice Although it has been done for two purposes, the surface treatments so far have not been satisfactory for avoiding sticking or scorching of rice, regardless of the non-water-passing function.

  Further, in the case where the glaze is applied to the unglazed surface portion or the fluororesin is coated, the glaze and the fluororesin may be peeled off from the surface of the base material, which is not reliable.

  Therefore, in order to solve such a problem, the present invention forms inner pot bodies 1a to 1d with cordierite-based ceramics having high heat resistance, which are generally representative of clay pots, as shown in FIG. As a method for preventing sticking of rice and scorching while maintaining non-water permeability to the main bodies 1a to 1d, for example, as shown in FIGS. 2 and 3, first, the inner peripheral surface of the uncooked inner pot main body 1 In addition, after forming the non-water-permeable glaze layer 4a on the outer peripheral surface, the coating material (for example, fluororesin) excellent in non-adhesiveness was further applied to the inner peripheral surfaces of the inner pot bodies 1a to 1d. An object of the present invention is to provide an inner pot for an electric rice cooker that prevents sticking of rice and scorching as much as possible by forming the non-adhesive coating layer 5a.

  That is, in the inner pot 1 of the present embodiment, for example, each part of the inner pot main body 1a to 1c (including the part without the heating members 2a to 2c) extending from the bottom part to the side wall part shown in FIGS. The first and second glaze layers 4a and 4b are formed on both the inner peripheral surface and the outer peripheral surface, and at least on the inner peripheral surface side, a paint having excellent non-adhesiveness (for example, First, second, and third non-adhesive coating layers 5a, 5b, and 5c formed by applying a fluororesin) are formed.

  In this case, the first glaze layer 4a uses, for example, a brown glaze, and preferably has been subjected to a blasting process or the like that provides good adhesion to the entire inner and outer peripheral surfaces of the unglazed inner pot bodies 1a to 1d. And then dried with the second glaze layer 4b. The blasting may or may not be performed, but the adhesion strength is further increased by blasting.

  The second glaze layer 4b is a clear glaze that becomes transparent after baking, and is applied on the first glaze layer 4a after the application and drying of the first glaze layer 4a is finished. After being dried, they are baked together.

  As a result, the entire inner and outer peripheral surfaces of the inner pot main bodies 1a to 1d have a good-looking color in which the base color is a tea system and a transparent clear coat is applied thereon.

  And the inner pot main body 1a-1d of an unglazed state is reinforced by what is hard and high intensity | strength, and it becomes a thing which is hard to break.

  Furthermore, in the same state, as shown in FIG. 2 and FIG. 3, for example, the entire inner peripheral surface of the inner pot main body 1a to 1d has a non-adhesive paint (for example, fluororesin) adhesion. A surface treatment layer 6 (that is, a sand blast layer) is formed by applying a surface treatment (for example, sand blast treatment) to enhance the surface, and a paint having excellent non-adhesive properties (for example, a fluororesin) is applied thereon. The first, second, and third non-adhesive coating layers 5a, 5b, and 5c are sequentially coated in a laminated state. Here, it is preferable that the surface of the second glaze layer 4b to which the first surface-side coating layer 5a, which is the primary for ceramics, is applied, is sandblasted so that the roughness becomes Ra2-10.

  The first non-adhesive coating layer 5a is directly coated on the surface of the second glaze layer 4b (that is, the sandblast layer 6) as a ceramic primary layer (colored base layer), and the second non-adhesive coating layer. 5b is coated as a fluorine primary layer (colored layer) on the surface of the first non-adhesive coating layer 5a, while the third non-adhesive coating layer 5c is a topcoat layer (transparent clear layer). As described above, the second non-adhesive paint layer 5b is coated so as to be laminated. Here, PFA or PTFE is used as the top coat layer 5c, but PFA has higher non-adhesiveness.

  In order to form a non-adhesive paint layer that is durable and effective in preventing sticking and scorching of rice, heat on the inner peripheral surface of the inner pot main body 1a to 1d as well as its water repellency is high. Therefore, a film thickness of a predetermined value or more and an optimum film cross-sectional structure are required in consideration of how the heat is transmitted and heat distribution.

  The third non-adhesive paint layer 5c is made of a clear fluororesin. For example, a water scale is provided between the second non-adhesive paint layer 5b and the third non-adhesive paint layer 5c. A print display W is provided.

  In the rice cooker, even if the inner pot 1 is made of an extremely heat-resistant cordierite-based base material such as an earthen pot, a water scale corresponding to the amount of cooked rice is required to show an appropriate amount of water.

  This water scale is naturally provided by a method such as printing on the surface of the second glaze layer 4b as in the prior art, but in that case, there is a problem that it tends to disappear due to long-term use (wear).

  Therefore, the third non-adhesive paint layer 5c to be coated on the surface of the second non-adhesive paint layer 5b is a clear fluororesin, and the second non-adhesive paint layer 5b and the third non-adhesive paint are used. A printed display W for water scale is provided between the layer 5c.

  In this way, the printed indication W for water scale is covered by the non-adhesive paint layer 5c having a high wear strength, so that it will never disappear even when used for many years, and it is a transparent non-adhesive paint. It becomes visible from the outside in a state of being lifted by refraction of light through the layer 5c.

  As described above, in the present embodiment, the inner pot 1 is made of the inner pot main body 1a to 1c made of cordierite-based pottery, and the water-imperviousness applied to the inner and outer peripheral surfaces of the inner pot main body. First, second glaze layers 4a, 4b, and the first, second glaze layers 4a, 4b coated on the inner peripheral surface of the inner pot 1 on the surfaces of the first, second glaze layers 4a, 4b. The adhesive paint layers 5 a, 5 b, and 5 c are formed, and a heating member for induction heating is provided on the outer peripheral surface of the bottom of the inner pot 1.

  According to such a configuration, the non-adhesive coating layers 5a, 5b, and 5c having higher water repellency are formed on the surface of the glaze layers 4a and 4b, so that compared to the case of only the glaze layers 4a and 4b. The non-adhesiveness of the inner peripheral surface of the inner pot 1 becomes much higher, and it becomes difficult for rice to stick and burn.

  Further, a sandblast layer 6 is formed on the surfaces of the first and second glaze layers 4a and 4b, and the first, second and third non-adhesive coating layers 5a, 5b and 5c are formed on the sandblast layer 6. Since the non-adhesive coating layers 5a, 5b, 5c can be prevented from being peeled off.

  In the present embodiment, there are two glaze layers, but there may be a case where a single glaze layer is formed and the surface of the glaze layer is subjected to sandblasting.

  By the way, as shown in FIG. 4, the uneven | corrugated shape K can be provided in the bottom part 1a of the inner pot 1, and the non-adhesive coating layer (for example, fluororesin coating layer) 5 can also be formed in the convex part Ka. If it does in this way, since the foaming from the bottom part of the inner pot 1 will become good, the lack of heating of the inner pot center part at the time of rice cooking will be eliminated. In addition, it becomes more effective when the fluororesin coating layer 5 contains 10% or more and less than 80% of ceramic, glass beads, diatomaceous earth, or the like.

  Further, as shown in FIGS. 5A and 5B, a non-adhesive paint layer (for example, a fluororesin coating layer) containing polka dots, concentric ceramics, glass beads or the like in the bottom 1a of the inner pot 1 ) 5, 5... If it does in this way, since the foaming from the bottom part of the inner pot 1 will become good, the lack of heating of the inner pot center part at the time of rice cooking will be eliminated.

  Moreover, as shown in FIG. 6, the non-adhesive coating layer (for example, fluororesin coating layer) 5 which contained ceramic, glass beads, etc. only in the bottom part 1a of the inner pot 1 may be formed. Since the foaming from the bottom of the inner pot 1 is improved, the lack of heating at the center of the inner pot during cooking is eliminated.

Second Embodiment FIGS. 7 and 8 show an enlarged cross-sectional view of a main part of an inner pot for an electric rice cooker according to a second embodiment of the present invention.

  In this case, the glaze layer 4b on the surface side of the glaze layers 4a and 4b formed on the inner peripheral surfaces of the inner pot bodies 1a to 1d has a high adhesion to the non-adhesive coating layers 5a, 5b and 5c. It is considered a glaze layer. If it does in this way, the adhesiveness to the glaze layer 4b of the non-adhesive coating layer 5a, 5b, 5c can be ensured, without performing sandblasting which is very complicated.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Third Embodiment FIGS. 9 and 10 show an enlarged cross-sectional view of a main part of an inner pot for an electric rice cooker according to a third embodiment of the present invention.

  In this case, only one layer of the glaze layer 4 is formed on the inner peripheral surfaces of the inner pot bodies 1a to 1d, and the glaze layer 4 has a high adhesion to the non-adhesive coating layers 5a, 5b, 5c. It is said that. If it does in this way, the adhesiveness to the glaze layer 4 of the non-adhesive coating layer 5a, 5b, 5c can be ensured, without giving sandblasting which is very complicated processing.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

  The invention of the present application is not limited to the above-described embodiment, and it is needless to say that the design can be appropriately changed without departing from the gist of the invention.

It is a half section showing the whole heat insulation surface structure of the inner pot for electric rice cookers concerning a 1st embodiment of the invention in this application. It is sectional drawing which expands and shows the heat insulation surface structure of the bottom part of the inner pot for electric rice cookers concerning 1st Embodiment of this invention. It is sectional drawing which expands and shows the heat insulation surface structure of the side wall part of the inner pot for electric rice cookers concerning 1st Embodiment of this invention. It is bottom part sectional drawing which shows the modification of the inner pot for electric rice cookers concerning 1st Embodiment of this invention. It is a bottom part top view showing other modifications of the inner pot for electric rice cookers concerning a 1st embodiment of the invention in this application, (i) shows the case of a polka dot pattern, and (b) shows the case of concentric circle shape. It is a half sectional view showing another modification of the inner pot for electric rice cookers according to the first embodiment of the present invention. It is sectional drawing which expands and shows the heat insulation surface structure of the bottom part of the inner pot for electric rice cookers concerning 2nd Embodiment of this invention. It is sectional drawing which expands and shows the heat insulation surface structure of the side wall part of the inner pot for electric rice cookers concerning 2nd Embodiment of this invention. It is sectional drawing which expands and shows the heat insulation surface structure of the bottom part of the inner pot for electric rice cookers concerning 3rd Embodiment of this invention. It is sectional drawing which expands and shows the heat insulation surface structure of the side wall part of the inner pot for electric rice cookers concerning 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 is an inner pot, 1a is an inner pot bottom part, 1b is an inner pot corner part, 1c is an inner pot side wall part, 1d is an inner pot opening part, 1a-1d is an inner pot main body, 2a-2c are 1st-3rd. The heating members, 4a and 4b are the first and second glaze layers, 5a, 5b and 5c are the first, second and third non-adhesive paint layers (fluorine resin coating layers), and 6 is the surface treatment layer (sandblast) Layer), W is a printed display for water scale.

Claims (4)

An inner pot body made of a non-metallic material, a non-water-permeable glaze layer applied to the inner and outer peripheral surfaces of the inner pot body, and a non-adhesive paint on the inner peripheral surface of the inner pot body The non-adhesive paint layer formed by coating, and a heating member for induction heating provided on the outer peripheral surface of the inner pot body, the glaze layer applied to the inner peripheral surface of the inner pot body An inner pot for an electric rice cooker, characterized in that a surface treatment layer is formed on the surface by applying a surface treatment for enhancing the adhesion of a paint having excellent non-adhesiveness. The inner pot for an electric rice cooker according to claim 1, wherein the surface treatment layer is a sandblast layer obtained by sandblasting. The inner pot for an electric rice cooker according to claim 1, wherein the surface treatment layer is a lithia glaze layer formed by applying a lithia glaze. The inner peripheral surface of the inner pot main body is formed with a water scale scale printed display, and a transparent non-adhesive paint to be applied is used. The inner pot for electric rice cookers as described in any one of 3.

Images