JP6759532B2 - Cookware lid - Google Patents

Description

The present invention relates to a lid of a cooking utensil such as a rice cooker.

For example, a rice cooker is known as a cooking utensil. By the way, the lid of the rice cooker is provided with an inner lid that also functions as a heat radiating plate or the like, which contributes to proper rice cooking in the inner pot.

Some of these inner lids are coated with fluorine to improve care and to produce a far-infrared effect.

However, the fluorine coating has high water repellency, and when the steam generated during rice cooking condenses on the inner lid, it becomes water droplets having a large contact angle, which causes an increase in the amount of dew condensation.

Further, when evaporating by heating the lid heater, water droplets having a large surface area evaporate slowly, so it is necessary to increase the amount of heating by the lid heater.

In addition, when the water droplets condensed on the inner lid become large during heat retention, they cannot withstand their own weight and fall, but when the falling state is repeated, the dropped water droplets cause the rice to become porridge-like and cause complaints.

As shown in Patent Documents 1 to 3 below as a means for reducing such adverse effects, "aminoalkylsiloxane, etc.", "Aminoalkylsiloxane, etc.", which is a hydrophilic coating film on the surface of a base material such as a lid of a cooking utensil or a base material, Those to which "sidoxyalkylsiloxane or the like" or "a product to which a titanium oxide photocatalyst is applied" are known.

By the way, as for water repellency and hydrophilicity, as shown in "Relationship diagram of various droplets and contact angle" in FIG. Where it is defined as hydrophilic, when the above-mentioned known hydrophilic coating was provided on the inner lid of the rice cooker and tested, when the contact angle was 90 degrees or less and 80 degrees or more, the rice was being cooked and kept warm. The decrease in the amount of dew condensation in was not expected.

Further, even if the contact angle was 80 degrees or less, when the surface was smooth, the results of the experiment varied, and stable results could not be obtained.

Japanese Unexamined Patent Publication No. 7-116056 Japanese Unexamined Patent Publication No. 7-118608 Japanese Unexamined Patent Publication No. 10-127497

An object of the present invention is to solve such a problem, and to provide a lid of a cooking utensil having an enhanced hydrophilic function.

In order to achieve the above object, the present invention adopts the following configuration.

In the invention according to claim 1, an opaque lid of cookware, having a coating film having an always hydrophilicity on the inside of the lid, the said coating containing particulate silica, the coating configuration membrane, a hydrophilic functional exert when not containing the silica, by containing the silica, those formed by further enhanced. As will be described later, silica is a "generic term for silicon dioxide (SiO ₂ ) or a substance composed of silicon dioxide" and is known to be porous.

In the invention according to claim 2, the content of the silica is 10% to 20% by weight. Further, in the invention according to claim 3, the cooking utensil has a heating means for heating the lid, and during cooking, the hydrophilic function of the lid and heating by the heating means bring about the lid. Configuration to reduce condensation.

According to the present invention, the hydrophilicity can be further increased, that is, the water film can be formed, and the amount of dew condensation generated can be stably suppressed as compared with the one having a conventionally known coating film.

Further, even in heat retention, it is possible to eliminate the dripping of dew condensation from the inner lid surface.

Further, since the amount of water droplets dripping from the inner lid is reduced, the amount of heating by the lid heater can be reduced, and energy saving can be contributed accordingly.

In addition, although the careability is inferior to that of fluorine coating, it is as good as the inner lid that has been anodized (surface treatment that improves weather resistance, corrosion resistance, and design by anodizing the surface of aluminum). Can maintain sex.

View of the rice cooker from diagonally above Related diagram of various droplets and contact angle, etc.

FIG. 1 is a diagram showing the entire rice cooker 1 as a part of the front surface and a part of a cross section, and FIG. 2 is a diagram showing a relationship between various droplets and a contact angle. The cooking utensil may be any cooking utensil, but a rice cooker will be described below.

The rice cooker 1 has a rice cooker main body 2 and a lid unit 3. The rice cooker main body 2 has an inner case (protective frame) 4 made of synthetic resin formed in a bottomed tubular shape, and a tubular outer case 5 which is an outer housing for holding the inner case 4. Then, the outer case 5 and the inner case 4 are combined and integrated to form a bottomed tubular rice cooker main body 2 having an open upper portion, and the lid unit 3 can be opened and closed in a form of covering the opening. It is attached.

Inside the inner case 4, an inner pot 6 made of a magnetic metal material such as a stainless steel material capable of self-heating by an eddy current induced inside (a clay pot having a heating element at the bottom or the like may be used). Is stored and set, and a work coil for induction heating, which is not shown, is concentrically wound at different positions on the inside and outside in the radial direction, for example, on the bottom wall portion of the inner case 4. , The bottom surface portion and the curved portion of the inner pot 6 housed in the inner case 4 are heated by a known control device (not shown) to cook rice or the like.

Further, a heat retaining heater 7 is provided on the outer surface of the upper side wall portion of the inner case 4, and the contents are kept warm by heating the side surface portion of the inner pot 6.

The outer case 5 includes, for example, a cover member 8 formed of a synthetic resin plate as a vertically tubular side plate, a shoulder member 9 made of synthetic resin provided at the upper end of the cover member 8, and the cover. It is composed of a bottom member 10 provided at the bottom of the member 8.

The outer case 5 has a hook-shaped shoulder piece on the inner peripheral side of the shoulder member 9 with respect to the upper portion of the shoulder member support piece 11 which is on the upper end side of the inner case 4 and is bent in a hook shape in the outer peripheral direction. 12 are engaged and supported to be integrated, and an induction heating coil 13 which is a work coil for heating the heat radiating plate is arranged above them.

On the other hand, the lid unit 3 has an outer cover 17 made of synthetic resin constituting the outer peripheral surface thereof, and an inner cover 18 made of synthetic resin fixedly provided in the circumferential direction inside the outer cover 17. An internal space 19 as a hollow heat insulating structure is provided between the covers 17 and 18. Then, the inner lid 30 described later is detachably attached below the inner cover 18 of the lid unit 3.

Further, in the central portion of the outer cover 17 and the inner cover 18 constituting the lid unit 3, a pressure adjusting port 20 penetrating in both the upper and lower directions is provided, and a cap structure as shown in the drawing is adjusted with respect to the pressure adjusting port 20. The pressure unit 21 is detachably fitted from above.

A tubular portion 22 for attaching a heat radiating plate is provided in the central portion of the inner cover 18 below the pressure adjusting port 20, and a small-diameter fitting cylinder located in the center of the inner lid 30 is provided in the tubular portion 22. The inner lid 30 can be attached and detached by fitting and locking the portion 23.

The base portion of the first packing 24 is fixed to the outer peripheral side fixing portion of the outer cover 17 and the inner cover 18, and the outer peripheral side upper surface of the inner lid 30 is sealed by the first packing 24. It has become so.

Further, a recessed portion 36 is formed on the lower surface of the outer peripheral portion of the inner lid 30, and a second packing 25 is fitted into the recessed portion 36. When the lid unit 3 is closed, the second packing 25 is fitted. The other end of the packing 25 is in contact with the upper surface of the reduced diameter opening edge 6a of the inner pot 6 to seal the inner pot 6.

The outer peripheral cover 17 extends deeply downward until the outer peripheral edge portion expands the outer diameter and continues to the outer peripheral surface of the shoulder member 9, thereby reliably covering the outer peripheral surface of the induction heating coil 13 portion. It prevents the heat generated in the induction heating region from escaping to the outside.

Then, the lid unit 3 is disengaged from the rice cooker main body 2 by pushing an opening / closing lever (not shown), and automatically opens by the spring force of a hinge mechanism (not shown).

A substantially half-moon-shaped operation panel unit 26 as shown in FIG. 1, for example, is provided above the front surface portion of the rice cooker main body 2, and the operation panel unit 26 has a sufficiently wide and large display area as a liquid crystal display unit. 27 and various operation switches such as a rice cooker switch 28a, a timer reservation switch 28b, a cancel switch 28c, a heat retention / reheating switch 28d, an angry switch 28e, a menu operation switch 28f, an hour switch 28g, and a minute switch 28h are provided.

An example of the inner lid 30, which is also the heat radiating plate of the present invention, will be described. The inner lid 30 has a heat radiating portion 33 and an induction heating portion 35. The heat radiating portion 33 is a portion corresponding to the diameter of the reduced diameter opening edge portion 6a of the inner pot 6, and protrudes slightly downward, and heats the heated inner lid 30 toward the center of the inner pot 6. Dissipate heat toward.

Further, the outer peripheral side of the heat radiating portion 33 has an inverted U-shaped cross section, and the inner peripheral portion thereof has a recessed portion 36 into which the base portion of the second packing 25 fits, and the recessed portion 36 has a second recessed portion 36. When the packing 25 is fitted, the other end covers the upper end of the opening edge 6a of the inner pot 6 and seals the inside of the inner pot 6.

The induction heating unit 35 is a portion facing the induction heating coil 13, and is opposed to the induction heating coil 13 through a predetermined gap, and when the induction heating coil 13 is driven by a control device (not shown), Correspondingly, the induction heating unit 35 is induced to generate heat, and the heat is transmitted to the heat radiation unit 33, and is radiated from the entire surface of the heat radiation unit 33 to the rice in the inner pot 6.

The inner lid 30 is formed of a clad material formed by laminating a plate-shaped aluminum material and a plate-shaped stainless steel material in two layers, and a vacuum heat insulating space 40 is formed between the two materials. The aluminum material is a heat conductive member having good thermal conductivity and a high heat dissipation effect, and the stainless material is a magnetic metal member and generates heat satisfactorily by induction heating of the induction heating coil 13.

If the inner lid 30 is not induced and heated, it may have a two-layer structure of a plate-shaped aluminum material or a plate-shaped stainless steel material, and if it does not require a vacuum insulation space 40, it may be a plate-shaped aluminum material or a plate. It may have a single-layer structure made of a stainless steel material. Further, the heating source for heating the inner lid 30 may be a heater or may not have a heating source (in this case, it is not a heat radiating plate).

Conventionally, the inner lid 30 is coated with fluorine, but the fluorine coating has high water repellency, and it cannot be said that the amount of dew condensation on the inner lid is small because of the steam generated during rice cooking. It was. As a means for eliminating such an adverse effect, hydrophilic coating materials as described in the above Patent Documents 1 to 3 have been proposed.

In the present invention, the above-mentioned known paint can be used as the hydrophilic coating film, and other known paints may be used.

By the way, "Super Water Repellent and Super Hydrophilicity: Its Mechanism and Application Kaoru Tsujii Publisher: Yoneda Publishing Publisher: Sangyo Tosho Co., Ltd. 2nd Edition: May 31, 2011", "Section 1 Wenzel's Theory (p. 36)" ) ”,“ Wenzel's theory applies when the solid surface has a fine concavo-convex structure and the liquid placed on it makes complete contact with the solid surface. This complete contact. The condition is naturally satisfied when the contact angle is smaller than 90 degrees and gets wet "(hereinafter referred to as" Wenzel's theory ").

In addition, regarding silica, "Silica is a general term for substances composed of silicon dioxide (SiO ₂ ) or silicon dioxide. In addition to the name silica, it is also called silicic acid anhydride, silicic acid, or silicon oxide. In addition, "2.3.1 Filtering aid" in "2 Use in industrial fields" states, "Food for filtration by utilizing the porosity and adsorption capacity of silica. It is used as an additive. ", Silica is described as porous.

The present invention is an experimental confirmation that the hydrophilic coating film containing fine particles of silica is provided, and the hydrophilicity is increased as compared with the hydrophilic coating film not containing silica.

The effect is that, as a result of containing a predetermined amount of silica fine particles in the hydrophilic paint, fine irregularities due to the porous silica are generated on the surface of the coating film, for example, the above-mentioned "Wenzel theory". It is considered that the hydrophilicity was further increased due to the above reasons.

That is, to explain an example of the present invention, for example, a conventionally known hydrophilic paint containing 10% silica by weight is prepared, and this paint is applied to the inner surface of the inner lid (that is, the inner pot 6). It was applied to the surface on the opposite side) and then fired at about 380 ° C. to form a coating film, and as a result of experiments using such a coating film, the desired effect could be achieved.

The "weight ratio" of the above "10% by weight" is the weight% after firing (after the solvent or the like is vaporized). Further, if the silica content is less than 10% by weight, improvement in the hydrophilic effect cannot be expected, which is not preferable, but it may be 10% or more by weight, preferably 10% to 20% by weight.

The hydrophilic coating film is applied only to the inside of the inner lid 30, that is, the side facing the inner pot 6. Since only one side of the paint is required in such a coating form, labor and cost can be reduced. However, if necessary, it may be applied to both the inner and outer surfaces.

It should be noted that the intended purpose of the present invention can be achieved and the same effect can be achieved by the following means.

By the way, "Super Water Repellent and Super Hydrophilicity: Its Mechanism and Application" by Kaoru Tsujii Publisher: Yoneda Publishing Publisher: Sangyo Tosho Co., Ltd. 2nd Edition: May 31, 2011 "Section 4 Wetting of Fractal Surface Area" "Theory (p. 44)" states, "According to Wenzel's theory, when the actual surface area increases compared to the apparent surface area due to the uneven structure of the surface, wetting is emphasized. From the viewpoint of increasing this actual surface area. For example, the fractal surface is one ideal surface (see rest room 4). In the fractal structure, there is a small uneven structure in the large uneven structure, and there is a smaller uneven structure in the small uneven structure ... This is because the uneven structure is nested like this, giving a very large surface area. The fractal structure is, so to speak, the ultimate uneven structure. Therefore, if the surface can be made into a fractal structure, it may become extremely wet. It can be expected to have a repelling property. ”(Hereinafter referred to as“ the theory of fractal surface wetting ”).

Further, in general, "alumite treatment" is one of the surface treatments, and it is known that the treatment causes fine irregularities on the surface of the base material.

That is, in the above, by containing silica in the coating film of the inner lid, fine irregularities due to silica are formed on the surface of the inner lid to improve hydrophilicity. For example, the surface of the inner lid of aluminum (inside). It was experimentally confirmed that the hydrophilicity can be enhanced by first applying a blasting treatment or a polishing treatment to the surface of the surface or both the inner and outer surfaces, and then applying an alumite treatment to the uneven surface.

In this means, first, a slightly large uneven surface is formed by blasting or polishing treatment, and then an alumite treatment is applied to a slightly large uneven surface or the like to form fine unevenness on the slightly large uneven surface. Therefore, it is considered that the hydrophilicity is further enhanced for the reason such as the above-mentioned "theory of wetting of the fractal surface".

In such a means, the hydrophilic surface is changed to a known hydrophilic coating film to be a slightly large uneven surface by blasting or polishing treatment, and the surface is provided with fine irregularities. Compared to what is formed, it is easier to produce, the effect can be maintained stably, and the durability of the inner pot can be improved.

Further, the invention is characterized in that "a lid of a cooking utensil, the lid surface of which has irregularities by blasting or polishing treatment and alumite treatment applied to the surface having the irregularities". A lid of a cooking utensil. ”Or“ A lid of a cooking utensil, in which the surface of the lid has large irregularities due to blasting or polishing treatment and the large irregularities due to alumite treatment applied to the surface having the irregularities. A lid of a cooking utensil characterized by having small irregularities. "

The present invention is not limited to the configuration of the above embodiment, and the design can be appropriately changed without departing from the gist of the invention.

1 ... Rice cooker 2 ... Rice cooker body 3 ... Lid unit 4 ... Inner case 5 ... Outer case 6 ... Inner pot 6a ... Opening edge 7 ... Heat insulation heater 8 ... Cover member 9 ... Shoulder member 10 ... Bottom member 11 ... Shoulder member Support piece 12 ... Shoulder piece 13 ... Induction heating coil 14 ... Engagement rib 15 ... Coil holder 17 ... Outer cover 18 ... Inner cover 19 ... Internal space 20 ... Pressure regulating port 21 ... Pressure regulating unit 22 ... Cylinder 23 ... For fitting Cylinder part 24 ... First packing 25 ... Second packing 26 ... Operation panel part 27 ... Liquid crystal display part 28a to h ... Various rice cooking switches 30 ... Inner lid 33 ... Heat dissipation part 35 ... Induced heating part 36 ... Recessed part 40 … Vacuum insulation space

Claims (3)

The opaque lid of the cookware
The inside of the lid has a coating film that is always hydrophilic,
The coating film contains fine-grained silica,
The coating film, the lid of cookware hydrophilic functional exert when not containing the silica, by containing the silica, and characterized in that comprising further enhanced. The lid of a cooking utensil according to claim 1, wherein the content of silica is 10% to 20% by weight. The cooking utensil has a heating means for heating the lid.
The lid of a cooking utensil according to claim 1 or 2, wherein the hydrophilic function of the lid and heating by the heating means reduce dew condensation on the lid during cooking.

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