JP4628381B2 - Electromagnetic heating method and apparatus - Google Patents

Description

  The invention of this application relates to an electromagnetic heating method and an apparatus therefor. More specifically, the present invention relates to an electromagnetic heating method and apparatus useful as a heating furniture, a heating joinery, a warming tableware, a warming ornament, and the like.

  Traditionally, wood is not only easy to process as natural wood or processed wood material, but also has a unique feel, smell, etc., and is very close to human life, such as furniture such as chairs, desks, and chests, It has been used for a long time as a material for decorations such as flooring, walls, ceilings, and other joinery, dishes, tableware, and other items.

  As described above, due to the strength of living adhesion of wood, it is often used as a member for every application that is indispensable in human life. Among them, for example, a heating member as a member of a heater, etc. Often used as.

  However, it is not so easy to use wood as a heating member that needs to be kept at a constant temperature for a long time. In general, when using wood as a heating appliance or a part of a heating appliance, it is necessary to provide a heat source outside the wood and to heat the wood from the outside with this heat source. Unevenness has occurred and inefficient temperature rise has been forced.

  Therefore, it is not very common to use it as a heating member that directly heats wood, and it is applied only to a limited field such as floor heating. Considering the current situation, a method and apparatus for directly heating wood have been studied, but so far, a method and apparatus for directly heating wood have been realized. You can say that is not.

  Therefore, the invention of this application has been made in view of the circumstances as described above, and it is an object to provide a new wood heating method and apparatus capable of directly and efficiently heating wood. Yes.

The invention of this application is to solve the above-mentioned problems. First, a first magnetic wood and a second magnetic wood in which a magnetic substance is integrated with wood, a heat insulating wood, magnetic and wood and first solenoid coil disposed between the second magnetic timber, made of a second solenoid coil arranged between the second magnetic timber and the heat insulating timber, first magnetic timber The second magnetic wood is made by impregnating a magnetic material into the wood, and the first magnetic wood and the second magnetic wood, and the second magnetic wood and the heat insulating wood are bonded to each other to form a whole. Provided is an electromagnetic heating method characterized in that an integrated heat generating board is formed, an exciting current is passed through a first solenoid coil and a second solenoid coil to perform electromagnetic heating.

In the invention of this application, secondly, the first magnetic wood and the second magnetic wood, in which the magnetic substances are respectively integrated with the wood, the heat insulating wood, the first magnetic wood and the second A first solenoid coil disposed between the magnetic wood and a second solenoid coil disposed between the second magnetic wood and the heat insulating wood, the first magnetic wood and the second magnetic wood. Are made of a material in which a magnetic substance, tamo wood powder, and a phenolic powder resin are mixed, and the first magnetic wood and the second magnetic wood are bonded to the second magnetic wood and the heat insulating wood, respectively. Provided is an electromagnetic heating method characterized in that an integrated heating board is formed as a whole, an exciting current is passed through a first solenoid coil and a second solenoid coil , and electromagnetic heating is performed.

Thirdly, the electromagnetic heating method is provided in which the frequency of the excitation current is 10 kHz or more.

In the invention of this application, the fourth is an electromagnetic heating device having a heating part and an AC power supply part, wherein the heating part is a first magnetic material in which a magnetic substance is integrated with wood. The wood and the second magnetic wood, the heat insulating wood, the first solenoid coil disposed between the first magnetic wood and the second magnetic wood, and between the second magnetic wood and the heat insulating wood. It consists placed second solenoid coil, the first magnetic timber and the second magnetic timber is made from those respectively impregnated with a magnetic material to the wood, the first magnetic wood and second magnetic wood and, The second magnetic wood and the heat insulating wood are bonded to each other to form an integrated heat generating board, and an excitation current is sent from the AC power source to the first solenoid coil and the second solenoid coil. The heating part generates heat Providing an electric heating apparatus characterized and.

Further, in the invention of this application, the fifth, an electromagnetic heating device includes a heating unit and the AC power supply unit, the heating unit includes a first magnetic magnetic material is integrated respectively into the wood The wood and the second magnetic wood, the heat insulating wood, the first solenoid coil disposed between the first magnetic wood and the second magnetic wood, and between the second magnetic wood and the heat insulating wood. It consists placed second solenoid coil, the first magnetic timber and the second magnetic timber is made of a material respectively by mixing a magnetic material and ash wood flour and a phenolic powder resin, a first magnetic timber The second magnetic wood, and the second magnetic wood and the heat-insulating wood are bonded to each other to form an integrated heat generating board, and the first solenoid coil and the second solenoid coil are exchanged with each other. Excitation current is sent from the power supply The heating unit by to provide an electric heating device, characterized by fever.

Sixthly, the magnetic substance includes magnetic particles as a whole or a part thereof, and the size of the magnetic particles is 75 μm or less, and the seventh is the magnetic substance. the ferritic, metallic, or the electrothermal heating device is a magnetic amorphous systems, the eighth, the frequency of the exciting current to provide an electric heating device of the at 10kHz or more.

Furthermore, the invention of this application provides, in a ninth aspect , the above-described electric heating device, which is a heating furniture, a heating fixture, a cooking utensil, a warming tableware, a warming ornament, or a medical / health appliance. .

  As described above in detail, according to the invention of this application, it is possible to provide a wood heating method and apparatus for directly and efficiently heating wood, for example, not only a conventional heating floor, Realization of heating and warming furniture such as chairs, desks and chests that can be heated and warmed, heating and warming furniture such as floors, walls and ceilings, heating and warming dishes such as dishes and utensils, and heating and warming decorations such as dishes Also possible.

  The invention of this application has the features as described above, and an embodiment thereof will be described below.

  Above all, the invention of this application is characterized in that the magnetic substance and the excitation coil or the excitation conductive path are arranged on the wood, and the wood is heated by electromagnetic heating by the excitation coil or the excitation conduction path.

  For example, as illustrated in the test apparatus of FIG. 1, the electromagnetic heating method according to the present invention applies or embeds a conductive paint on the magnetic wood (1) containing a magnetic substance in the exciting coil (2), or on a flat surface or groove. Alternatively, the board (3) on which the excitation conductive path is formed by the arrangement of the conductive film strip is placed in contact, and the exciting current (4) is passed through the excitation coil (2) or the excitation conductive path for electromagnetic heating.

  At this time, as a method of integrating the magnetic substance into the wood, a magnetic substance may be injected into the wood, a powdery magnetic substance may be pressure-bonded to the wood surface, or a liquid form may be applied to the wood surface. A magnetic substance may be applied. And these means may be combined. The method of injecting a magnetic substance into wood and the case of pressing a powdery magnetic substance on the surface of wood are more efficient in terms of temperature rise than applying a liquid magnetic substance on the surface of wood. However, from the viewpoint of work, it is easier to apply a liquid magnetic substance to the wood surface.

  Further, as shown in FIG. 1, the excitation coil or the excitation conductive path is arranged by placing the excitation coil or the excitation conductive path board (2) in contact with the magnetic wood (1) integrated with the magnetic substance. Alternatively, an excitation coil or an excitation conductive path may be embedded in the magnetic wood (1). In any case, the winding method of the coil or the arrangement of the conductive path may be spiral or solenoid. The spiral shape indicates a state in which the turning radius is different, and the turning radius may be decreased or the turning radius may be increased. The solenoid shape indicates a state in which the turning radii are the same.

  In order to suppress high heat generation efficiency as a heat generation board and leakage of the magnetic field to the outside, an integrated type in which magnetic wood and excitation coil (excitation coil) or excitation conductive path fixing board are in close contact to eliminate the gap between them A heat generating board is exemplified as a more preferable form.

  Furthermore, in the present invention, the magnetic substance may contain magnetic particles as all or part thereof. In the case of magnetic particles, the particle size is 75 μm or less, and the material is ferrite, such as Mn—Zn ferrite, sendust, iron, and other various ferrite, metal, or amorphous magnetic materials, or With these magnetic fluids, the temperature can be increased more efficiently.

The frequency of the exciting current flowing through the exciting coil or the exciting conductive path is not particularly limited as long as the exciting current is generated. However, when the frequency is 10 kHz or more, the temperature can be increased more efficiently.

  In the present invention, wood can be used as an efficient heating member. For example, not only a conventional heating floor, but also a heating / warming furniture such as a chair, a desk, and a chiffon that can be heated and kept warm, a floor In addition, it is possible to realize heating and heating fixtures such as walls and ceilings, heating and warming dishes such as dishes and utensils, and heating and warming ornaments such as dishes.

Reference examples and examples will be shown below, and this description will be described in detail.

Reference example 1
The time change of the surface temperature was measured using three kinds of magnetic woods having different arrangement methods of the magnetic substance on the wood. The three types of magnetic wood are: a) injection-type magnetic wood in which water-based magnetic fluid W-35 is injected; a) powder-type magnetic wood in which 2500B Mn—Zn ferrite powder is pressed against the surface by pressure bonding; C) Three types of coating type magnetic wood coated with 2500B of Mn-Zn ferrite liquid on the surface were used.

  The size of the magnetic wood is 9 cm in length, 9 cm in width, and 3 cm in thickness. Inside, as an exciting coil, enamel-coated copper wire with a diameter of 0.35 mm and a pitch of 10 mm in height. 3 turns, and the method of winding the copper wire of the exciting coil was a solenoid.

  The temperature in the laboratory was 25.5 ± 0.5 ° C. and the humidity was 45 to 55%, and the excitation current was a frequency of 1 MHz and the current was an alternating current of 2 A. For comparison with the wood heating method of the present invention, fiber boards, particle boards, and cedar boards having the same size were also used as comparative board materials not containing a magnetic substance.

  And the thermograph was arrange | positioned in the position of 50 cm above the center of each board | plate material, and the temperature of the board | plate material surface was measured. The result is as illustrated in FIG. In the figure, injection-type magnetic wood marked with black squares and coated-type magnetic wood marked with black circles both rose to 45 ° C 80 minutes after the start of the experiment, and the experiment started with powder-type magnetic wood marked with black triangles. After 50 minutes, the temperature rose to 30 ° C.

  On the other hand, as a plate material not mixed with a magnetic substance, the □ cedar board has a rising temperature of 25 ° C. even after 80 minutes from the start of the experiment. The temperature rise was very low, and even when 80 minutes passed after the start of the experiment, the temperature rise was only 18 ° C. at most.

Reference example 2
Next, the coating type magnetic wood used in Reference Example 1 was examined for a temperature increase with respect to the difference in winding of the exciting coil.

  In order to compare and examine the winding method of the exciting coil, three different types of winding methods were used: solenoid, intermediate, and spiral. Here, the intermediate shape refers to an intermediate shape in which the copper wire has a spiral radius and a solenoid shape toward the top of the wood. In this embodiment, a spiral shape having a copper wire whose radius of rotation decreases toward the top of the wood was used.

  For comparison, the temperature change over time was measured in the same manner for the fiber board not mixed with a magnetic substance, using the above-mentioned three types of solenoid, intermediate, and spiral.

  Various experimental conditions for the solenoid type, intermediate type, and spiral type coating type magnetic members are the same as those in Example 1. The results are as illustrated in FIG. 3. The solenoidal magnetic wood marked with a black circle has a temperature rise of 43 ° C. after 50 minutes from the start of the experiment, and the spiral magnetic wood marked with black triangles is 50 minutes after the start of the experiment. The temperature rise was 40 ° C., and the intermediate shape of the black square marks was 28 ° C. 50 minutes after the start of the experiment.

  On the other hand, as for the fiber board in which the magnetic substance is not mixed, the solenoid-like fiber board marked with ○ has a temperature rise of only 16 ° C. even 50 minutes after the start of the experiment, and the spiral fiber board marked with Δ and □ In the case of the intermediate fiber board, the temperature rise was only 10 ° C. even 50 minutes after the start of the experiment.

Reference example 3
Next, the relationship between temperature rise and time was examined under the same experimental conditions as in Example 1 using three kinds of magnetic woods having different magnetic substances.

  The magnetic substance is composed of Mn—Zn ferrite 2500B, Sendust, and iron KIP300A powder, all of which have a particle size of 75 μm or less. Properties of these various magnetic substances are as shown in Table 1. In Table 1, various magnetic substances were processed into a ring shape having an inner diameter of 10 mm and an outer diameter of 20 mm, and a test was performed with an excitation coil in which the periphery was wound 20 times with a copper wire. The maximum magnetic field at this time was 500 A / m, and the frequency of the excitation current was 1 MHz.

  The relationship between temperature and time in three kinds of magnetic woods with different magnetic substances is as shown in FIG. 4. The sendout of black circles shows a temperature increase of 50 ° C. 60 minutes after the start of the experiment. The temperature rise of Mn—Zn ferrite 2500B was 43 ° C. 60 minutes after the start of the experiment, and the black square mark iron KIP300A powder reached a temperature rise of 33 ° C. 60 minutes after the start of the experiment.

Reference example 4
Next, under the same experimental conditions as in Reference Example 1, the relationship between the frequency and temperature was examined by changing the frequency of the excitation current. For the injection type magnetic wood and the coating type magnetic wood used in Reference Example 1, the coil winding method is solenoidal, and the temperature rises 90 minutes after the start of the experiment using the five types of excitation current frequencies. Examined.

  The result is as shown in FIG. 5, and the higher the excitation current frequency, the greater the temperature rise. For example, when the frequency of the exciting current is 106 Hz, the temperature rise exceeds 50 ° C. in the black square-coated magnetic wood, and the temperature rise also reaches 45 ° C. in the black circle-impregnated magnetic wood. .

Example 5
In FIG. 6 ( Example 1 ), FIG. 7 ( Example 2 ), and FIG. 8, the example of preparation of magnetic wood and a heat_generation | fever board was shown with the procedure.

  FIG. 9 shows the magnetic characteristics of the magnetic wood obtained as frequency characteristics of complex permeability. In addition, the measurement conditions are shown in Table 2 below.

The heat generation performance of the heat generation board was measured, and the results shown in FIG. 10 and Table 3 were obtained.

(A) and (B) are the top view and front view which illustrated the test device of this invention. It is the relationship figure which showed the relationship between time and a wood surface temperature rise by using magnetic wood from which the arrangement | positioning method of a magnetic substance differs as a parameter. It is the relationship figure which showed the relationship between time and a wood surface temperature rise by making a different excitation coil winding method into a parameter. It is the relationship figure which showed the relationship between time and a wood surface temperature rise by using a different magnetic material as a parameter. It is the relationship figure which showed the relationship between the frequency of an exciting current, and the wood surface temperature rise. It is process drawing which showed the manufacture example of the impregnation type | mold magnetic wood and its heat_generation | fever board. It is process drawing which showed the example of preparation of powder type | mold magnetic wood and its heat_generation | fever board. It is process drawing which showed the example of preparation of application | coating type magnetic wood and its heat_generation | fever board. It is the figure which illustrated the magnetic characteristic of magnetic wood. It is the figure which illustrated the heat generation characteristic of the heat generation board.

1 Magnetic wood 2 Excitation coil 3 Excitation coil board 4 Excitation current

Claims (9)

A first magnetic wood and a second magnetic wood each having a magnetic substance integrated with the wood, a heat insulating wood, and a first solenoid coil disposed between the first magnetic wood and the second magnetic wood And a second solenoid coil disposed between the second magnetic wood and the heat insulating wood, each of the first magnetic wood and the second magnetic wood being made by impregnating a magnetic substance into the wood, The first magnetic wood and the second magnetic wood, and the second magnetic wood and the heat insulating wood are bonded together to form an integrated heat generating board, and the first solenoid coil and the first magnetic wood An electromagnetic heating method characterized by passing an exciting current through the solenoid coil of 2 to perform electromagnetic heating. A first magnetic wood and a second magnetic wood each having a magnetic substance integrated with the wood, a heat insulating wood, and a first solenoid coil disposed between the first magnetic wood and the second magnetic wood And a second solenoid coil disposed between the second magnetic wood and the heat-insulating wood, wherein the first magnetic wood and the second magnetic wood are made of a magnetic substance, tamo wood powder, and phenolic powder resin , respectively. Made of mixed materials, the first magnetic wood and the second magnetic wood, and the second magnetic wood and the heat insulating wood are bonded together to form an integrated heating board. An electromagnetic heating method, wherein an exciting current is passed through the first solenoid coil and the second solenoid coil to perform electromagnetic heating. The electromagnetic heating method according to claim 1 or 2, wherein the frequency of the excitation current is 10 kHz or more. An electromagnetic heating device, comprising a heating unit and an AC power supply unit, wherein the heating unit includes a first magnetic wood and a second magnetic wood each having a magnetic substance integrated with the wood, a heat insulating wood, a first solenoid coil disposed between the first magnetic wood and second magnetic timber, made of a second solenoid coil arranged between the second magnetic timber and the heat insulating timber, first Each of the magnetic wood and the second magnetic wood is made by impregnating a wood with a magnetic substance, and the first magnetic wood and the second magnetic wood, and the second magnetic wood and the heat insulating wood are bonded to each other. The heating unit is formed by an integrated heating board that is integrated as a whole, and the heating unit generates heat when an excitation current is sent from the AC power source unit to the first solenoid coil and the second solenoid coil. apparatus. An electromagnetic heating device, comprising a heating unit and an AC power supply unit, wherein the heating unit includes a first magnetic wood and a second magnetic wood each having a magnetic substance integrated with the wood, a heat insulating wood, A first solenoid coil disposed between the first magnetic wood and the second magnetic wood, and a second excitation coil or excitation conductive path disposed between the second magnetic wood and the heat insulating wood. The first magnetic wood and the second magnetic wood are each made of a material obtained by mixing a magnetic substance, tamo wood flour, and a phenolic powder resin , and the first magnetic wood, the second magnetic wood, and the second magnetic wood, respectively. The magnetic wood and the heat-insulating wood are bonded to each other to form an integrated heat generating board, and an excitation current is sent from the AC power source to the first solenoid coil and the second solenoid coil. Heating part generates heat Electric heating device according to claim. The electrothermal heating apparatus according to claim 4 or 5 , wherein the magnetic substance includes magnetic particles as a whole or a part thereof, and the size of the magnetic particles is 75 µm or less. The electrothermal heating device according to any one of claims 4 to 6 , wherein the magnetic substance is a ferrite-based, metal-based, or amorphous-based magnetic material. The electrothermal heating device according to any one of claims 4 to 7 , wherein the frequency of the exciting current is 10 kHz or more. The electric heating apparatus according to any one of claims 4 to 8 , wherein the electric heating apparatus is a heating furniture, a heating joinery, a cooking utensil, a warming tableware, a warming ornament, or a medical / health appliance.

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