JP3094482U - Planar heating element - Google Patents

Abstract

(57) [Problem] To provide a method for reducing the intensity of electromagnetic waves radiated from a sheet heating element to an extremely small value, and to provide the sheet heating element. A heating portion (3a) made of a sheet-like electric resistor is attached between power supply portions (3b) arranged in parallel.
The two heating elements 2-1 and 2-2 are
The respective power supply portions 3b and the heat generating portions 3a are overlapped so as to face each other, and the opposite power supply portions 3b are connected to an AC power supply (not shown) with the polarities of the power supply portions 3b reversed and connected to each other. Electromagnetic waves can be eliminated by setting the directions of the currents flowing in the opposed portions 1 and 2-2 to be opposite to each other, that is, the intensity of the emitted electromagnetic waves can be reduced to 1/100 milligauss or less. Further, it is possible to prevent the leakage current breaker from malfunctioning due to the leakage current based on the ground capacitance of the planar heating element.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention relates to a sheet heating element, and more particularly, to a sheet heating element with an alternating current. A sheet-like heating element that can virtually eliminate the electromagnetic waves emitted when generating heat. It is related.

[0002]

[Prior art]

  The heating surface is formed in the shape of a sheet, which is then heated by a commercial AC power source to release uniform radiant heat. The sheet heating element (hereinafter referred to as sheet heating element) that can be radiated is used for floor heating, It is known to be used for various purposes such as preventing cold from the windows of buildings. It

[0003]

[Problems to be solved by the device]

  By the way, with the development of science and technology, various artificial electromagnetic waves will fill up the earth. It is growing and there is concern about the impact on humanity. For example Sunday every day ( In the November 15, 2002 issue, the electromagnetic wave strength exposed for a long time is 2 milligauss (0 .2 micro-Tesla) It is reported that there is an argument that it should be below.

[0004]   In that respect, the electric energy radiated from the sheet-shaped sheet heating element and other sheet heating elements for heating is Magnetic wave intensity is extremely weak, but it is a device that is used for a long time near the human body. Therefore, reduce the intensity of electromagnetic waves emitted from these heating elements as much as possible. Is considered desirable.

[0005]   The present invention has been made in view of the above problems, and is a sheet-like planar heating element. Provides a sheet heating element that can reduce the electromagnetic wave intensity radiated from the surface to an extremely small value The purpose is to do.

[0006]

[Means for Solving the Problems]   In order to achieve the above object, the sheet heating element of the present invention has a heating portion formed in a sheet shape. The corresponding parts of the pair of heating elements are overlapped with each other through the electric insulator. Of the electric current flowing in each of the portions where the pair of heating elements face each other. Since the directions are opposite to each other, the polarities of the corresponding power supply portions of the heating elements are reversed from each other. Connected to an AC power supply.

[0007]   Radiation from AC current of 50 to 60 cycles, which is the frequency used by commercial AC power supply The wavelength of the generated electromagnetic wave becomes extremely long. Therefore, matched relative to each other Neglecting the phase shift of the electromagnetic waves caused by the distance between the electrodes and the sheet-shaped heating element It gets smaller as much as possible. Therefore, superimpose sheet heating elements of the same specifications on each other. , By reversing the direction of the current flowing in each, the opposite electrode and heating surface The electromagnetic waves of opposite phases emitted from each other can cancel each other. However It is not enough to simply superimpose them, but the electromagnetic waves actually emitted by the electromagnetic wave intensity meter It is recognized that it is necessary to perform superposition while checking the strength.

[0008]   When the heat generating portion is a sheet-shaped electric resistor, sheet-shaped gold is used. Although it may be a metal resistor, for example, the fine-particle conductor is divided into a flexible thermoplastic resin. Dispersed, extruded from a slit nozzle and processed into a sheet As the conductive material, carbon is mentioned as an inexpensive material that does not deteriorate for a long time. be able to.

[0009]   The sheet-shaped heating element is disclosed in Japanese Patent Application No. 2001-104169 by the present applicant. Heating element manufactured using the method of applying for a patent (“Misato Co., Ltd. Plastic heat ") has a positive temperature coefficient of electric resistance, for example, whether the temperature is 0 ° C across normal temperature. The resistance value when the temperature is increased by 50 ° C. can be doubled. Therefore As the temperature rises, the resistance value rises and the amount of heat generated can be reduced. Can be advantageously applied to the implementation of

[0010]   Etching the electric resistance film formed on the substrate where the heat generating portion is flexible or hard Or a heat-generating electric circuit formed on the substrate by printing. The current supply unit is connected to the electric circuit by a connecting unit that connects a lead wire. Can be given. For the above etching or printing type planar heating element For example, a relatively small hob that is placed on the floor such as a toilet seat heating, a home sink, a gas stand, etc. For example, a condensation panel or a heating element to prevent condensation attached to the windows of automobiles it can.

[0011]   It is preferable that the planar heating element of the present invention is protected by an insulator around its periphery. Therefore , The heating element is covered with an electrically insulating flexible resin sheet, and the peripheral edge is adhered to make it watertight. Of the flexible resin sheet by stacking two flexible bags It can act as an air insulation sheet.

[0012]   The following phenomena have been observed as the action of the electromagnetic wave erasing sheet heating element. That is, power consumption The floor heating element for floor heating, which requires a large force, will not leak due to the internal technical regulations A leakage current breaker is to be installed. By the way, a sheet heating element is installed Then, a certain capacitance (hereinafter referred to as ground capacitance) is generated between the ground and If you use a heating element, a kind of leakage current will flow, and equipment such as a sheet heating element will However, the breaker may still operate. However, the electromagnetic waves generated from the sheet heating element It was observed that the above-mentioned malfunction was prevented or suppressed by deleting the.

[0013]   That is, a sheet-like heating element for floor heating, etc., to which a breaker for leakage current is attached and used. In, the leakage current based on the capacitance to ground generated between the planar heating element and the ground The present invention can be applied for the purpose of preventing a malfunction due to this.

[0014]

[Embodiment of device]

  One embodiment of the present invention will be described below with reference to the accompanying drawings. Explained.

[0015]   The sheet heating element 2 of the first embodiment shown in FIGS. A part of which is enlarged) is shown on the upper side (shown by reference numeral 2-1) and the lower side (shown by reference numeral 2-2). These are collectively referred to as the heating element 2) and above and below. Fever The body 2 has a heating portion 3a in which carbon powder is dispersed in polyethylene or the like with both ends in the width direction. It has a shape (see FIG. 3) in which a power feeding portion 3b made of a plain weave copper wire electrode is embedded in the vicinity. .

[0016]   Then, the heating element 2 is a PET sheet having an aluminum foil (not shown) attached to the surface thereof. A cover 4 is covered and the peripheral portion 4a is fusion-bonded to form a bag-like 6 and is watertight. . In addition, the aluminum foil used increases the surface strength of the PET sheet 4 and becomes water resistant. It is a thin one to enhance the property, and it has no substantial electromagnetic wave shielding ability. is doing.

[0017]   As shown in FIG. 3, at the end portion in the longitudinal direction of the heating element 2, a lead for supplying electric power for heat generation. The wire 5 (FIG. 3, only the electric wire is shown) is connected to the power supply unit 3b. Power supply part of this part 3b is a resin portion which is removed and exposed. Made with the same specifications as above By stacking the heating elements 4, the heating portion 3a and the electrode portion 3b are vertically aligned with each other. You can stack them exactly.

[0018]   In the case of the first embodiment, the lead wire 5 is taken out from the heating element 2 in the width direction. Putting one heating element 2-1 on top of the other heating element 2-1 and turning it over. Therefore, the two sets of lead wires 5 are prevented from overlapping. Alternatively, two fever With respect to each of the bodies 2, the lead-out direction of the lead wire 5 is opposite to the longitudinal direction of the heating element 2. The opposite side can be selected as appropriate.

[0019]   Before describing the electromagnetic wave erasing method for the sheet heating element 1 of the first embodiment, the heating element 2 The manufacturing method will be described. The heating element 2 is made by mixing a predetermined amount of carbon fine particles into molten polyethylene. The raw material composition is arranged so that two power feeding parts 3b made of plain woven copper wire are fed in parallel. Then, the sheet-shaped heat generating portion 3a is simultaneously formed from both the front and back sides with the slit-shaped nozzle (shown in the figure. It is extruded from the sheet and is fed by rollers from both outer sides of the two sheets before solidifying. The one sheet pressed against the electric part 3b was used. In that case the roller As a result, as shown in FIGS. The electric resistance of the sheet portion between the two electrodes 3 is set to a predetermined value, and the two sheets are The thickness was adjusted for sufficient fusion bonding.

[0020]   The obtained long sheet-shaped heating element was cut into a predetermined length, and the resin layer at one end was cut. Remove and expose the power supply part 3b for a predetermined length, and connect the lead wire 5 by caulking or the like. It was At that time, the lead wire lead-out portion was moved to one side to form heating elements 2-1 and 2-2.

[0021]   The heating elements 2-1 and 2-2 of the sheet heating element 1 of the first embodiment are both 200 V and 50 Or, using a 60-cycle commercial AC power source, the width of the heating element is 450 mm, As for the deviation, the power consumption per 1 m of the electrode 3 is 50 W / m, and the sheet heating element 1 has a power consumption of 10 W / m. It was designed to be 0 W / m. [Preparation of heating element sample for electromagnetic wave intensity measurement]   A method of eliminating electromagnetic waves using the above-described sheet heating element 1 will be described. table Water-tight heating element placed in a bag 6 made of PET sheet 4 with aluminum foil stuck on its surface 2-1 and 2-2 are overlapped, and the current I-1 flowing through the heating surfaces of the heating elements 2-1 and 2-2 And AC-2 (both in Fig. 3) flow in opposite directions. (Not shown).

[0022]   Therefore, the electromagnetic waves generated at the corresponding positions of the heating elements 2-1 and 2-2 Vectors can have the same intensity in opposite directions (ie opposite phases) . The electromagnetic waves generated by commercial power sources have extremely long wavelengths, so they are emitted at the corresponding positions. Since the phase shift due to the difference in the position of the generated electromagnetic waves is extremely small, Since they cancel each other out, the emitted electromagnetic waves can be substantially eliminated.

[0023]   That is, do not move the position of the electromagnetic wave intensity meter placed on the upper bag 6 (heating element 2-1). However, the heating element 2 is set so that the electromagnetic wave intensity becomes substantially zero at any position. Eliminating electromagnetic waves by adjusting the position of -1 (heating element placed on the upper side) You can [Measurement of electromagnetic wave intensity]   Electromagnetic wave generation is measured by a portable electronic device manufactured by US Radiation Technology Inc. Magnetic wave environment measuring instrument "Tracer model MR1105", maximum measurable intensity 100 Gauss, measuring instrument that displays the minimum measurable intensity 1/100 milligauss by digital value It was used.

[0024]   For measurement, place the measuring instrument on the heating element and do not pull up or change the position while measuring. When measured again, it can be in the range of 0.00 to 0.04 milligauss, It was shown that sufficient safety can be ensured.

[0025]   Electromagnetic wave elimination is required when the sheet heating element 1 of the first embodiment is attached for floor heating. Explain the area. Taking a concrete substrate as a general example, flatness and levelness If it is not enough, after adjusting with mortar etc., arrange the heat insulating material and Two heating elements 2-1 and 2-2 that compose the planar heating element on top, temperature sensor, wiring, etc. are required Place the member and follow the above procedure so that the electromagnetic wave strength measurement value is substantially zero. When the heating element 2-1 is moved and the electromagnetic wave elimination adjustment is completed, for example, a 10 cm square A wire mesh is used to prevent displacement of the two heating elements 2-1 and 2-2, Rinse the entire floor to fix it, and attach the floor material on it.

[0026]   In addition to the above construction method, the heating floor construction method using the plastic heat manufactured by Misato Co., Ltd. Can be used. In this case, the heat-resistant resin developed as the heat insulating material is used. The construction method and construction materials of the company can be used, such as the use of Nicam plate.

[0027]   The sheet heating element 1 shown in FIGS. 1 to 3 described above is assembled at the time of construction such as for heating. The electromagnetic wave was erased when the operation was performed, but according to the second embodiment shown in FIG. The sheet heating element 1 is assembled in a factory. That is, the heating element 2-1 and 2-2 are overlaid on each other with a PET insulating sheet 7 in between, The surface is covered with a PET sheet 4 having an aluminum foil attached to the surface, and the peripheral edge 4a is covered. The insulating sheet 7 is also fused together to form the bag 6 having a partition in the center. In this case as well, in order to eliminate the electromagnetic waves, the overlapping And preferably fix them to each other by gluing so that they will not be displaced. It

[0028]   For use, usually 100V or 200V, 50 or 60 cycles This is a temperature controller that is connected to a commercial AC power source and uses a thermistor type temperature sensor, etc. separately. A temperature control device was attached by a trawler.

[0029]   The sheet heating element 1 according to the third embodiment shown in FIG. Depending on the purpose, flexible substrates such as synthetic resin such as PET or FRP are also used A metal foil (for example, a thickness of 10 μm) such as aluminum or copper is exposed on the substrate 8 of FIG. The ones attached on both sides are etched so that the heating circuits on the front and back overlap each other. It consists of a heat generating part 3a and terminals for connecting lead wires (not shown) to both ends. And an upper heating element 2-1 and a lower heating element 2-2 which are composed of is there. The heating circuit may be formed by printing instead of etching in the first half.

[0030]   Therefore, in the third embodiment, the substrate 8 blocks the two heat generating portions 3a. Compose an electrically insulating sheet that borders. In addition, two sets of power supply units 3 composed of the above terminals b can be performed by other commonly used connection means.

[0031]   The planar heating element 1 configured as described above also substantially radiates electromagnetic waves in the same manner as described above. Can be erased. Even in this embodiment, the front and back heating circuits are In forming the above, what should be formed while confirming the electromagnetic wave elimination effect is It is the same as the state. The third embodiment shown above is a hot plate placed in front of the sink. It can be applied to various relatively small sheet heating elements up to about 3 x 6 plates, such as Therefore, it is not possible to obtain the same electromagnetic wave cancellation effect by various circuit patterns. Easy to understand.

[0032]   Each of the embodiments described above is for specifically explaining the present invention. Therefore, the present invention cannot be limitedly interpreted.

[0033]

[Effect of device]

  As described above, the sheet heating element of the present invention is a sheet-shaped sheet heating element manufactured in the same manner. Two bodies were stacked and connected to a power source so that currents would flow in opposite directions. Therefore, it is necessary to easily reduce the radiated electromagnetic wave intensity to 1/100 milligauss or less. It is possible to provide a planar heating element that is safe for the human body.

[0034]   Further, when a sheet heating element is installed, a certain capacitance to ground is generated. For floor heating, etc. When a planar heating element of a certain size or more is heated by an AC power source, the Although a kind of leakage current flows, the present invention was found to have the effect of suppressing this current.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a structure of a sheet-shaped heating element which constitutes a planar heating element according to a first exemplary embodiment of the present invention in a cross section intersecting an electrode.

FIG. 2 is an explanatory view showing a planar heating element according to a first embodiment of the present invention, which is configured by stacking two sheet heating elements of FIG. 1 in a cross section intersecting an electrode.

FIG. 3 is a perspective view showing two sheet-like heat generating elements separated from each other and partly cut away to facilitate understanding of the configuration of the planar heat generating element shown in FIG.

FIG. 4 is an explanatory diagram showing a structure of a planar heating element according to a second embodiment of the present invention in a cross section intersecting with electrodes.

FIG. 5 shows a configuration of a planar heating element according to a third embodiment of the present invention implemented by a heating circuit formed by etching,
It is a perspective view which separated and showed two wiring boards.

[Explanation of symbols]

1 Sheet heating element 2 heating element 2-1 Upper heating element 2-2 Lower heating element 3a Heating part 3b Power supply unit 4 electrical insulation sheet 6 Electrical insulation sheet 4 Bag making

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Creator Kenichi Taguchi             521-18 Kamiuwada, Satte City, Saitama Prefecture Misato Co., Ltd.             Inside the company (72) Creator Haruo Inoue             521-18 Kamiuwada, Satte City, Saitama Prefecture Misato Co., Ltd.             Inside the company

Claims (7)

[Scope of utility model registration request] 1. A pair of heating elements, each having a heating portion formed in a planar shape, are formed such that corresponding portions overlap each other via an electrical insulator, and the pair of heating elements are provided in a portion facing each other. A planar heating element in which the polarities of the corresponding power feeding portions of the heating elements are opposite to each other so that the directions of the currents flowing through the heating elements are opposite to each other, and the heating elements are connected to an AC power source. 2. The sheet heating element according to claim 1, wherein the heating portion is a sheet-shaped electric resistor, and the power feeding portion is an electrode attached in parallel to the heating portion. 3. The sheet heating element according to claim 2, wherein the electric resistor is formed by dispersing a fine particle conductor in a flexible thermoplastic resin, extruding it from a slit nozzle, and processing it into a sheet. . 4. The sheet heating element according to claim 3, wherein carbon is used as the conductor. 5. The heat generating portion is formed of an electric resistance film formed on a flexible or hard substrate by etching or is formed by printing on the substrate, and an electric circuit for heat generation is formed on the substrate. The sheet heating element according to claim 1, wherein the portion is a connecting portion for connecting a lead wire to the electric circuit. 6. A flexible resin sheet is obtained by covering the heating element with an electrically insulating flexible resin sheet and stacking two watertight bags having their peripheral edges in close contact with each other to form a watertight bag.
The sheet heating element according to claim 1, which is the electrical insulating sheet. 7. A planar heating element for floor heating or the like, which is provided with a leakage current breaker, prevents malfunction due to leakage current based on electrostatic capacitance between the planar heating element and ground. The sheet heating element according to claim 1.