Heating device and method for manufacturing the same

Abstract

Reduce the amount of heat required to heat to the target temperature and shorten the heating time to reduce CO2 2 To provide a heating device that can reduce emissions. To provide a manufacturing method for producing the said heating device more efficiently. [Solution] A heating device 1 having a magnetized functional material layer 2 formed on the heat transfer surface 40 of a heat transfer base 4 by mixing tourmaline powder 30 and non-magnetic material powder 31. The heating device 1 having a functional material layer 2 in which the content of magnetic powder 31, which is obtained by magnetizing the non-magnetic material powder 31, is 1 wt% or more and 50 wt% or less. The heating device 1 having a plurality of scattered convex layers 20 of the functional material layer 2. The heating device 1 having a plurality of recesses 41 provided on the heat transfer surface 40, in which an embedded layer 21 made of the functional material layer 2 is provided. A method for manufacturing a heating device 1 having a mixing step of mixing tourmaline powder 30 and non-magnetic material powder 31 to make a mixed powder 3, a molding step of forming the mixed powder 3 on the heat transfer surface 40 of a heat transfer base 4 to make a functional material layer 2, and a magnetization step of magnetizing the non-magnetic material powder 31.

Description

Technical Field

[0001] The present invention relates to heat transfer technology for transferring heat to substances such as gases, liquids, and solids, and particularly relates to a heating device with enhanced function of heating a heating target more efficiently, and a method for manufacturing the same.

Background Art

[0002] The inventor of the present invention has shown in Patent Document 1 (Japanese Patent No. 4565476) that a tourmaline powder body is laminated and integrated as a coating layer on the surface of an unmagnetized magnetic body in the form of a flat plate or a lump obtained by uniformly mixing and solidifying an unmagnetized magnetic powder, or uniformly mixed and stirred with the unmagnetized magnetic powder, and solidified or coagulated by appropriate means to form a homogeneous mixed structure, and then magnetized the unmagnetized magnetic powder of the formed body, handling the magnetic body side with unmagnetized magnetic powder while remaining unmagnetized, and magnetizing the whole after appropriate solidification or coagulation to form a laminated structure or a homogeneous mixed structure. By magnetizing the unmagnetized magnetic body side, a composite material composed of a molded body having a laminated structure or a homogeneous mixed structure of a tourmaline powder body and a magnetic powder is manufactured without the tendency of the tourmaline powder body to be repelled by the magnetic body, and a method for manufacturing a composite material composed of tourmaline and a magnet, a composite material obtained by the method, and composite materials used for them have been developed.

[0003] Even after the development, the inventor of the present invention has conducted research for many years aiming at the effective utilization of the composite material composed of tourmaline and a magnet. Particularly in recent years, the inventor has explored the application of the composite material to the technology for reducing the emission amount of CO, which is regarded as a causative substance of abnormal weather that has been a concern. The inventor of the present invention has focused on the technology for reducing the emission amount of CO generated by the use of electricity and gas when eating out, in restaurants and stores that provide takeout and eat-in meals, and when eating in each household. 2 The present invention relates to heat transfer technology for transferring heat to substances such as gases, liquids, and solids, and particularly relates to a heating device with enhanced function of heating a heating target more efficiently, and a method for manufacturing the same. 2 The inventor of the present invention has shown in Patent Document 1 (Japanese Patent No. 4565476) that a tourmaline powder body is laminated and integrated as a coating layer on the surface of an unmagnetized magnetic body in the form of a flat plate or a lump obtained by uniformly mixing and solidifying an unmagnetized magnetic powder, or uniformly mixed and stirred with the unmagnetized magnetic powder, and solidified or coagulated by appropriate means to form a homogeneous mixed structure, and then magnetized the unmagnetized magnetic powder of the formed body, handling the magnetic body side with unmagnetized magnetic powder while remaining unmagnetized, and magnetizing the whole after appropriate solidification or coagulation to form a laminated structure or a homogeneous mixed structure. By magnetizing the unmagnetized magnetic body side, a composite material composed of a molded body having a laminated structure or a homogeneous mixed structure of a tourmaline powder body and a magnetic powder is manufactured without the tendency of the tourmaline powder body to be repelled by the magnetic body, and a method for manufacturing a composite material composed of tourmaline and a magnet, a composite material obtained by the method, and composite materials used for them have been developed.

[0004] Various cooking utensils used for heating, such as frying pans, pots, stockpots, and rice cooker inner pots, are developed and offered with special coatings such as fluorine, platinum, diamond, and titanium applied to the surface of metals like iron, stainless steel, and aluminum, to prevent food from sticking during cooking and to make them easy to clean after use.

[0005] For example, a cooking appliance is known, as shown in Patent Document 2 (Japanese Patent Publication No. 8-299191), which comprises a graphite substrate having a predetermined shape for cooking and having a thermal conductivity of 30 W / (m·K) or more over the entire temperature range from room temperature to 400°C; a layer made of thermal decomposition products of a metal-containing organic polymer formed on the surface or surface layer of the graphite substrate, at least on the cooking surface; and a fluororesin layer formed on the surface of the layer made of thermal decomposition products of the metal-containing organic polymer, at least on the cooking surface. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 4565476 [Patent Document 2] Japanese Patent Application Publication No. 8-299191 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, as mentioned above, the cooking appliance shown in Patent Document 2 (Japanese Patent Publication No. Hei 8-299191) is effective in preventing sticking, making it easy to clean after use, and improving durability, but it also reduces the amount of heat required for cooking and shortens the heating time, thus reducing CO2 emissions. 2 It was not a technology that could reduce emissions.

[0008] In view of these circumstances, the present invention reduces the amount of heat required to heat to the target temperature and shortens the heating time, thereby reducing CO2 emissions. 2 One of the challenges is to provide a heating device that can reduce emissions. One of the objectives of this invention is to provide a manufacturing method for more efficiently producing the aforementioned heating device. [Means for solving the problem]

[0009] In other words, the present invention provides a heating device comprising a layer made of a mixed powder obtained by mixing tourmaline powder and non-magnetic material powder, which is laminated onto a heat transfer substrate, and a magnetized functional material layer provided after lamination. The functional material layer may be provided on any surface of the heat transfer substrate, but it is preferable to provide it on the heat transfer surface that transfers heat to the object.

[0010] According to the aforementioned heating device, the target temperature can be reached in a shorter time. According to the aforementioned heating device, heating can be performed with higher efficiency, therefore CO 2 This can contribute to reducing [the amount of heat]. In the heating device, as the temperature of the heat transfer surface rises, the magnetic powder in the functional material layer electromagnetically induces the tourmaline powder, and the tourmaline powder generates heat by being irradiated with infrared rays. In addition to the heat supplied to the heat transfer substrate from the outside, the infrared rays generate heat, so it can reach a higher temperature in a shorter time.

[0011] The functional material layer is composed of tourmaline powder and non-magnetic material powder. The tourmaline powder can be made from finely ground tourmaline minerals. The mixed powders constituting the functional material layer can be combined and integrated such that the tourmaline powder forms a layered structure or a uniformly dispersed structure relative to the magnetic material. That is, the tourmaline powder and magnetic material powder can be mixed and stirred together with a clay body and a silica sol solution, and then solidified or solidified by appropriate means such as sintering or natural drying to form the functional material layer. The aforementioned unmagnetic powder is not particularly limited, and in addition to the most common ferrite-based powders, various materials that can be magnetized by magnetization can be used, such as iron-based, Cr-based, Mg-based, steel materials (carbon steel, electrical steel sheets, etc.), and extremely strong magnetized materials such as samarium cobalt and alnico. By magnetizing these materials, the unmagnetic powder becomes a magnetic powder or a magnetic material.

[0012] The mixing ratio of the tourmaline powder and the non-magnetic material powder can be appropriately selected depending on the intended use and the chosen materials. In addition to increasing the proportion of tourmaline powder, the amount of non-magnetic material powder can also be increased. However, in the heating container of the present invention, it is desirable that the content of magnetic powder, which is made by magnetizing the non-magnetic material powder, in the functional material layer is 1 wt% or more and 50 wt% or less. If the content of the magnetic powder is less than 1 wt%, the electromagnetic induction function by the magnetic powder cannot be sufficiently obtained, and if it exceeds 50 wt%, the far-infrared emission cannot be sufficiently obtained due to the decrease in the proportion of tourmaline powder.

[0013] The heat transfer substrate has a heat transfer surface and transfers heat supplied from the outside to the outside. The heat transfer substrate can be made of a material with excellent thermal conductivity, such as iron, stainless steel, aluminum, other metals, metal-containing ceramics, metal-containing synthetic resins, etc. The heat transfer substrate can be made of a material with heat storage properties in part or in whole, such as silicone resin, polyimide, polycarbonate, fluororesin, nylon, heat-storing ceramics, etc.

[0014] The heat transfer substrate can be a pot, stockpot, kettle, teapot, iron kettle, frying pan, hot plate, griddle, grill, inner pot of a rice cooker, electric kettle, or various other cooking utensils. The heat transfer substrate can be a heating device of various shapes such as a block, plate, rod, sphere, mesh, film, chain, or string. For example, the heating device can be widely used in humidifiers, heaters, electric foot warmers, hand warmers, electric blankets, etc.

[0015] The heat transfer substrate can be a heating container having a bottom wall and a surrounding wall, and at least a portion of the inner and outer surfaces of the bottom wall and the inner circumferential surface of the surrounding wall of the heating container can be the heat transfer surface. In particular, when it is a cooking utensil such as a pot or frying pan, or an appliance that heats some kind of pin inside the container, it is desirable that the surface facing the object to be heated, or the surface in contact with the object to be heated, be the heat transfer surface, and that the functional material layer be provided on the heat transfer surface.

[0016] The present invention can also be used in a heating device in which the functional material layer is a plurality of convex layers scattered at intervals. The convex layers can enhance the aesthetic design of the heat transfer surface. By providing acute-angled edges in the contour shape of the convex layers, heat can be concentrated at the acute-angled edges, thereby enabling more effective heat transfer. The convex layers can have a plan view shape with acute-angled edges in their contour.

[0017] The present invention can also be provided with a heating device having a plurality of recesses on the heat transfer surface, and an embedded layer made of the functional material layer provided in the recesses. Such an embedded layer can enhance the aesthetic design of the heat transfer surface. By providing an embedded layer in the recesses, the embedded layer can be protected from contact with other objects and its durability can be increased. The recesses and the embedded layer can have a plan view shape with acute-angled edges.

[0018] The present invention can also be used to provide a heating device in which a plurality of protrusions are provided on the heat transfer surface, and a continuous coating layer made of the functional material layer is provided in the area including the protrusions on the heat transfer surface. Providing a continuous coating layer in the area including the protrusions on the heat transfer surface increases the area of ​​the functional material layer and further improves the heat generation efficiency. The protrusions on the heat transfer surface and the functional material layer covering each protrusion can have a plan view shape with sharp-angled edges in their contours.

[0019] The present invention also allows for a heating device in which a plurality of protrusions are provided on the heat transfer surface, and a mesh-like coating layer made of the functional material layer is provided in the area remaining beyond the protrusions on the heat transfer surface. The protrusions on the heat transfer surface can protect the mesh-like coating layer, increase durability, reduce friction, and improve wear resistance. The protrusions on the heat transfer surface can have sharp-angled edges in their contour shape.

[0020] The shape having an acute-angled edge in the contour can be a triangle, square, pentagon, hexagon, heptagon, octagon, etc. in plan view, as well as a diamond shape, three-pointed star, five-pointed star, six-pointed star, seven-pointed star, eight-pointed star, etc. By providing an acute-angled edge in the contour shape, heat concentration occurs at the acute-angled edge, allowing for more effective heat transfer.

[0021] The present invention provides a method for manufacturing a heating device, which includes a mixing step of mixing tourmaline powder and non-magnetic material powder to form a mixed powder, a forming step of forming the mixed powder on the heat transfer surface of a heat transfer substrate to form a functional material layer, and a magnetization step of magnetizing the non-magnetic material powder.

[0022] According to the manufacturing method of the heating device, the tourmaline powder and the non-magnetic material powder of the mixed powder can be uniformly mixed in the mixing step. By performing the magnetization step after the forming step, it is possible to prevent the tendency that the tourmaline powder before solidification of the functional material layer is repelled by the magnet powder and to individualize while maintaining a homogeneous mixing state.

[0023] In the magnetization step, the tourmaline powder is compacted and individualized by the magnetic adhesion of the magnetic powders, so that it can be integrated with the heat transfer surface of the heat transfer substrate without the need for a binder, a primer, or the like. In the mixing step, in addition to the tourmaline powder and the non-magnetic material powder, an adhesive such as a heat-resistant binder or a primer can be mixed. The forming step needs to be performed prior to the magnetization step. The functional material layer can be sintered to the heat transfer surface by firing.

Effects of the Invention

[0024] According to the heating device of the present invention, the amount of heat required for heating to the target temperature can be reduced, the heating time can be shortened, and the emission amount of CO 2 can be reduced. According to the manufacturing method of the heating device of the present invention, the heating device can be manufactured more efficiently.

Brief Description of the Drawings

[0025] [Figure 1] Perspective view of a frying pan 1 as a heating device. [Figure 2] Three-view drawing of the frying pan 1, where (A) is a plan view of the frying pan 1, (B) is a cross-sectional view of the portion of the B-B line in (A), and (C) is a bottom view of the frying pan 1. [Figure 3]These are cross-sectional views of the main parts of each frying pan 1: (A) Cross-sectional view of a convex block layer 20 formed by a functional material layer 2 on the heat transfer surface 40; (B) Cross-sectional view of an embedded layer 21 made of a functional material layer 2 provided in the concave and convex portions 41 and 42 on the heat transfer surface 40; (C) Cross-sectional view of a continuous coating layer 22 made of a functional material layer 2 provided on the heat transfer surface 40 including the concave and convex portions 41 and 42; and (D) Cross-sectional view of a mesh-like coating layer 23 made of a functional material layer 2 provided on the heat transfer surface 40 that is the remainder of the convex portion 42. [Modes for carrying out the invention]

[0026] The heating device and its manufacturing method according to this embodiment will be described in detail below with reference to the drawings. In particular, this embodiment will describe the structure of the frying pan 1 as a heating device according to the manufacturing method of the frying pan (heating device) 1, which includes a mixing step of mixing tourmaline powder 30 and non-magnetic material powder 31 to form a mixed powder 3, a molding step of forming the mixed powder 3 onto the heat transfer surface 40 of a heat transfer base 4 to form a functional material layer 2, and a magnetization step of magnetizing the non-magnetic material powder 31.

[0027] The mixing step involves homogeneously mixing the tourmaline powder 30 and the non-magnetic material powder 31 so that the magnetic powder 31 content is 1 to 50 wt% to obtain a mixed powder 3. The tourmaline powder 30 and the non-magnetic material powder 31 have similar particle sizes, for example, 1 to 200 μm, preferably 1 to 50 μm, and particularly preferably 1 to 5 μm. It is difficult to process the particle size to less than 1 μm, and if it exceeds 200 μm, there is a risk of roughness and unevenness occurring in the functional material layer 2.

[0028] As shown in Figures 1 and 2(A) to (C), the main body 4 of the frying pan 1, which is the heat transfer base, is made of iron and has a diameter of 28 cm. The bottom surface 400, excluding the outer peripheral wall surface, the inner bottom surface 401, and the range of the inner peripheral wall surface 402 from the inner bottom surface 401 up to a height of 60 to 80%, preferably 70%, can be set as the heat transfer surface 40. For example, if the total height dimension H1 of the inner peripheral wall 402 in Figure 2(B) is 10 cm, the height H2 of the heat transfer surface 40 of the inner peripheral wall 402 can be set to 6 to 8 cm, preferably 7 cm. As shown in Figures 1 and 2(A) and (C), the molding process can be performed to form the mixed powder 3 onto the heat transfer surface 40 of the main body 4 with a constant thickness, creating a continuous layered functional material layer 2.

[0029] Furthermore, as shown in Figures 2(B) and 3(A), the molding process can be used to form a layer of convex aggregates 20 in which multiple pentagram-shaped mixed powders 3 of a certain thickness are scattered at intervals over the area corresponding to the heat transfer surface 40. As shown in Figure 3(B), multiple pentagram-shaped recesses 41 of a certain depth and convex portions 42 around them can be formed by press working over the area corresponding to the heat transfer surface 40, and the mixed powders 3 can be filled into the recesses 41 to form a buried layer 21. The recesses and convex portions 41 and 42 can also be processed only in the area of ​​the inner bottom surface 401 and inner peripheral wall 402 that directly contacts the food and corresponds to the heat transfer surface 40, excluding the outer bottom surface 400.

[0030] As shown in Figure 3(C), the molding process involves creating a plurality of pentagram-shaped recesses 41 of a certain depth and convex portions 42 around them in the area corresponding to the heat transfer surface 40, and molding the mixed powder 3 of a certain thickness onto the heat transfer surface 40 including the recesses and convex portions 41 and 42 to form a continuous coating layer 22. As shown in Figure 3(D), a plurality of pentagram-shaped convex portions 42 of a certain height and recesses 41 around them are created in the area corresponding to the heat transfer surface 40, and the mixed powder 3 is filled into the remaining recesses 41 of the convex portions 42 to form a mesh-like coating layer 23. The thickness of each of the functional material layer 2, the convex mass layer 20, the embedded layer 21, the continuous coating layer 22, and the mesh-like coating layer 23 can be 1 μm to 1 mm, preferably 1 to 100 μm. If the thickness is less than 1 μm, it becomes difficult to obtain the heating acceleration effect, and if it exceeds 1 mm, there is a risk of worsening the efficiency of heat transfer.

[0031] The height difference between the concave and convex portions 41 and 42 can be approximately the same as the thickness of the functional material layer 2, the convex block layer 20, the embedded layer 21, the continuous coating layer 22, and the mesh-like coating layer 23, which is 1 μm to 1 mm, preferably 1 to 100 μm. If the height difference between the concave and convex portions 41 and 42 is less than 1 μm, the height difference at the sharp edges of the pentagram-shaped contour is small, making it difficult to induce heat concentration, and it is also difficult to clearly see, making it difficult to enhance the design. If the height difference between the concave and convex portions 41 and 42 exceeds 1 mm, processing becomes difficult.

[0032] After the molding process is completed, the container body 4 can be magnetized by the subsequent magnetization process to a strength of 3000 gauss or less, for example, 640 gauss or 2000 gauss, for the non-magnetic material powder 31 contained in the functional material layer 2, convex layer 20, embedded layer 21, continuous coating layer 22, or mesh-like coating layer 23. Furthermore, if the tourmaline powder 30 and the non-magnetic material powder 31 lose their fluidity during the molding process and become fixed to one another, the magnetization process can magnetize the non-magnetic material powder 31 contained in the functional material layer 2, convex layer 20, embedded layer 21, continuous coating layer 22, or mesh-like coating layer 23 to a strength of 3000 gauss or more, for example, 5000 gauss. [Examples]

[0033] [Comparative experiment comparing the heating performance of a prototype and a commercially available product] A prototype frying pan (functional material processed frying pan) 1, which had a magnetized functional material layer, was used to create a mixed powder by combining tourmaline powder and non-magnetic material powder in a ratio (mass ratio) of 10:2. A comparison of the heating performance was conducted with a commercially available iron frying pan of the same diameter (28 cm) and shape. 1000 cc of room temperature water at the same temperature was placed in both pans, with the water level set to the same 2 cm. The time it took to reach a boiling point of 100°C was measured using a standard household gas stove with a high heat setting of 4.20 kW. Furthermore, the time it took to cook boiled vegetables was also measured.

[0034] [Results of comparative experiment] Comparative experiments showed that while a commercially available frying pan took 4 minutes and 35 seconds to boil under high heat, the frying pan 1 of this embodiment could boil water in 2 minutes and 58 seconds under normal heat, achieving a difference of 1 minute and 37 seconds. Furthermore, while a commercially available frying pan required 2 to 3 minutes under high heat to boil spinach and Chinese milk vetch, the frying pan 1 of this embodiment could boil them in 1 to 1 minute and 30 seconds under normal heat, effectively halving the boiling time for vegetables. Moreover, the far-infrared radiation emitted by the tourmaline powder rapidly and uniformly raises the temperature of food, enabling low-temperature cooking and allowing for softer, more flavorful cooking in a shorter time.

[0035] [Table 1]

[0036] As is clear from the results of the comparative experiment described above, the frying pan 1 of this embodiment consumes less fuel and can complete cooking in a shorter time compared to commercially available frying pans. By widely disseminating the frying pan 1 of this embodiment for general household and commercial use, energy conservation and CO2 reduction will be achieved for society as a whole. 2 It is expected to make a significant contribution to reducing [the amount]. [Industrial applicability]

[0037] The heating device and its manufacturing method of the present invention can be used for cooking, heating, thawing, drying, and keeping warm articles, warming the human body or other living organisms, air conditioning, and the like. [Explanation of Symbols]

[0038] 1. Frying pan (heating device) 2 Functional material layer 3 Mixed powder 30 Same Tourmaline Powder 31 Same non-magnetic material powder 4. Main body (heat transfer base) 40 Same heat transfer surface

Claims

1. A method for manufacturing a heating device, comprising laminating a layer of mixed powder, which is made by mixing tourmaline powder and non-magnetic material powder, onto a heat transfer substrate, and then providing a magnetized functional material layer after lamination.

2. The method for manufacturing a heating device according to claim 1, wherein the functional material layer contains 1 wt% or more and 50 wt% or less of magnetic powder obtained by magnetizing unmagnetic material powder.

3. The method for manufacturing a heating device according to claim 1, wherein the functional material layer is a plurality of convex layers scattered at intervals.

4. The method for manufacturing a heating device according to claim 1, wherein the mixed powder is provided on a heat transfer surface of a heat transfer substrate for heating an object, the heat transfer surface is provided with a plurality of recesses, and an embedded layer made of the functional material layer is provided in the recesses.

5. The method for manufacturing a heating device according to claim 1, wherein the mixed powder is provided on a heat transfer surface of a heat transfer substrate for heating an object, the heat transfer surface is provided with a plurality of protrusions, and a continuous coating layer made of the functional material layer is provided in the area including the protrusions on the heat transfer surface.

6. The method for manufacturing a heating device according to claim 1, wherein the mixed powder is provided on a heat transfer surface of a heat transfer substrate for heating an object, the heat transfer surface is provided with a plurality of protrusions, and a mesh-like coating layer made of the functional material layer is provided in the area remaining over the protrusions of the heat transfer surface.

7. A mixing process in which tourmaline powder and non-magnetic material powder are mixed to form a mixed powder, A molding step in which the mixed powder is molded onto the heat transfer surface of a heat transfer substrate to form a functional material layer, A magnetization step in which the aforementioned non-magnetic material powder is magnetized, A method for manufacturing a heating device having the following characteristics.

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