WO2021214810A1 - Dispositifs de blindage pour les ondes électromagnétiques, qui sont utilisés pour des applications industrielles de divers types, et en particulier des carreaux absorbant les ondes électromagnétiques - Google Patents

Dispositifs de blindage pour les ondes électromagnétiques, qui sont utilisés pour des applications industrielles de divers types, et en particulier des carreaux absorbant les ondes électromagnétiques Download PDF

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Publication number
WO2021214810A1
WO2021214810A1 PCT/IT2021/050124 IT2021050124W WO2021214810A1 WO 2021214810 A1 WO2021214810 A1 WO 2021214810A1 IT 2021050124 W IT2021050124 W IT 2021050124W WO 2021214810 A1 WO2021214810 A1 WO 2021214810A1
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WO
WIPO (PCT)
Prior art keywords
absorbing
utilized
tiles
materials
electromagnetic waves
Prior art date
Application number
PCT/IT2021/050124
Other languages
English (en)
Inventor
Alessandro Sonego
Original Assignee
M.I.T. S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by M.I.T. S.R.L. filed Critical M.I.T. S.R.L.
Publication of WO2021214810A1 publication Critical patent/WO2021214810A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0001—Rooms or chambers
    • H05K9/0003—Shielded walls, floors, ceilings, e.g. wallpaper, wall panel, electro-conductive plaster, concrete, cement, mortar

Definitions

  • the invention relates to shielding devices for the electromagnetic waves, which are utilized for industrial applications of various kind, and in particular electromagnetic waves absorbing tiles.
  • the artificial electromagnetic fields may be produced by electrodes of electrical plants of various kind, by the telecommunications plants, by the mobile phones, by the electromagnetic fields produced inside the domestic and working environments, as the ones generated by electrical devices and appliances, by electrical machines, by treating machines with electro waves for products of various kind.
  • Low frequency electromagnetic fields (0 Hz - 10 KHz) generated by apparatuses for the transport and the delivery of electric energy or by electrodes. These electromagnetic fields are generated by very high, high, medium and low voltage lines, by generating stations and by transforming stations and rooms of the electric energy ;
  • High frequency electromagnetic fields (10 KHz - 300 GHz) generated by plants for radio telecommunications comprising radio and television broadcasting systems, link plants for radio, television and for mobile phone and landline (radio link) and the radars.
  • the international regulations provides for the respect of strict reference thresholds of the electromagnetic fields in presence of electrodes, as for example the portions of territory around the line which encircles the territory in which it is not allowed to stop and/or to live inside inhabited buildings for long periods.
  • the shielding of the same electromagnetic radiations is difficult at the moment, because of such a shielding is effected with metallic materials used for the building of the same apparatuses, and in these metallic materials the microwaves are conveyed and don’t propagate outside the same ones, and for ensuring efficient protections, the microwave apparatuses are made with wide surfaces made of metallic materials, circumstance that if on one the one hand increase the shielding effect against the microwaves, on the other hand increase the constructive sizes of these apparatuses, and so it requires the use of a great quantity of material and of working phases of this latter.
  • the shielding of the metal sheet against the microwaves can’t be used for shielding rooms and/or paved surfaces against electromagnetic waves generated by electrical plants included in these environments, that produce overheating of metals and the phenomenon of reflection of the waves that may produce opposed effects to the shielding and that consequently are not absolutely adapted to be used in these applications.
  • the object of the present invention is to realize suitable shielding device for the electromagnetic waves for applications of various kind above specified, and particularly to realize absorbing tiles for electromagnetic waves, adapted to perform the function to absorb efficiently the electromagnetic waves emitted by microwaves apparatuses and the ones emitted by electrical plants included in rooms and/or paved surfaces, wherein such shielding devices don’t have the problems and the limits of the shielding devices used actually.
  • the shielding devices and in particular the absorbing tiles of electromagnetic waves according to the present invention are realized with the constructive characteristics substantially will be described below, by way of a not-limitative example and with reference to the accompanying drawings in which :
  • Fig. 1 shows a front perspective view of an absorbing tile of electromagnetic waves for applications of various kind, without surface coating ;
  • Fig. 2 shows a front perspective view of an absorbing tile of electromagnetic waves for applications of various kind, with surface coating of white cement ;
  • Fig. 3 shows a front perspective view of an absorbing tile of Fig. 1, sectioned in the longitudinal direction thereof, at the middle of its width ;
  • Fig. 4 shows front perspective view of an absorbing tile of Fig. 2, sectioned in the longitudinal direction thereof, at the middle of its width ;
  • Fig. 5 shows a front view of a little raceway for containing electrical wires, with an upper closing lid, made of the same constructive material of an absorbing tile of electromagnetic waves, according to the invention ;
  • Fig. 6 shows front perspective view of an absorbing tile according to the invention, whose constructive material has been poured on a set of electrical wires ;
  • Fig. 7 shows a front perspective view a an arrangement of various absorbing tiles joined to each other, without surface coating ;
  • Fig. 8 shows a front perspective view a an arrangement of various absorbing tiles joined to each other, with a surface coating of white cement ;
  • Fig. 9 shows a front perspective view of a raceway for containing electrical wires, with an upper closing lid, as the one of Fig. 5, with e determine length ;
  • Fig. 10 shoes a front perspective view a an arrangement of various absorbing tiles joined to each other, according to the invention, in whose material there are embedded various electrical wires ;
  • Fig. 11 shows a front perspective view of a tunnel-shaped apparatus for treating by microwaves products of various kind, provided with shielding tiles against electromagnetic waves according to the invention.
  • the present invention refers to shielding devices for electromagnetic waves, used in industrial applications of various kind, and in particular to absorbing tiles of electromagnetic waves that is electromagnetic fields.
  • the absorbing tiles of electromagnetic fields are made with particular compound of materials of various kind, that will be described in detail after and, depending on the materials that are used, they are able to absorb the energy of the electromagnetic radiations with different wavelengths.
  • absorbing tiles are described by referring to figs. 1-11 and may be advantageously used for covering walls of rooms and/or paved surfaces, for shielding the same against the electromagnetic radiations generate by electrical plants included in these environments or electromagnetic fields generated by external telecommunication plants.
  • These types of absorbing tiles may be used specially for these applications :
  • the absorbing tiles that in the following figures are each inscribed with the number 5, are able to perform the function of absorbing efficiently the microwaves emitted by industrial microwaves ovens and the electromagnetic radiations emitted by electrical plants included in rooms and/or paved surfaces.
  • Fig. 1 shows an absorbing tile 5 according to the present invention, obtained with the material that will be described, without the application of at least a coating layer on the entire external surface.
  • Such a tile 5 is shaped preferably with a rectangular parallelepiped shape with a limited thickness and with the side of such a size to adapt itself on all the surface to be covered and shielded against the electromagnetic radiations.
  • Such sides are made with a length slightly greater than the width, but each tile may be made also with different geometric shapes with respect to the rectangular parallelepiped one of the described tile, and with variable sizes, for adapting itself on products to be shielded with surfaces of different sizes.
  • Each absorbing tile is obtained with a mixture of materials at environmental temperature, composed by powders of materials which absorb the electromagnetic radiations with the desired wavelength, which are mixed with cement, with the ratio that will be described soon.
  • the powders utilized for forming such a mixture of materials are the following :
  • - cement preferably white cement
  • the above described powders of materials are used to absorb the energy of the electromagnetic radiations and, in the described example, the energy of the frequency greater than the ones specified, that are utilized especially in the tunnel-shaped ovens of the industrial type, for treating products of various kind, as for example food, pasteurizing processes, processes for cooking, painting, glueing, drying (as in the case of products of wood to be dried for being then utilized for various applications), and any other process requiring the application energy.
  • the specified powders of materials are mixed to each other and with powdered cement, with the above cited percentages, and the mixture of the powders with the cement is randomly carried out with water, in a cold way that is at environmental temperature, by obtaining a mixture, that is poured into shaped dies (not shown), which are dimensioned and shaped for obtaining the absorbing tiles of the desired shape and size, respectively.
  • the mixture that has poured into each die, it is not touched anymore and is let to rest up to obtain the complete drying of the same mixture.
  • the drying of the mixture of each absorbing tile is obtained in a natural way to the air, or it may be also obtained in a fast way, by means of heat produced by heating elements, preferably of the electrical type, associated to the relative dies, without exceeding the maximum heating temperature of 150°C.
  • the mixture of each tile 5 may be obtained by using at least one type of powder or also one or more types of powders described above, obviously with the cement and the water and by leaving drying the all mixture as described.
  • the absorbing tile 5 may be realized not only without surface coating, as visible in Fig. 1, wherein the tiles are blackened because of the black carbon, but they may be also covered on the entire external surface thereof by at least a coating layer 6 constituted for example by white cement, as visible in Fig. 2, wherein the tiles are white, without thereby softening the shielding effect.
  • the absorbing tiles 5 may so be applied on surfaces of paving and/or of walls of rooms and/or inhabited environments under which there are installed electrical plants to be shielded from the electromagnetic radiations, or from external electromagnetic radiations made by telecommunication plants, thereby obtaining the effect to shield these rooms and/or environments from such electromagnetic radiations, and it is not necessary to use any other type of shielding device against the same radiations.
  • the absorbing tile 5 may be obtained also by mixing one or more of said powders absorbing the electromagnetic radiations with the mortar (in this case, formed by cement and sand), by producing in this way plasters, masonry or floors performing the function of this kind of components of buildings, as well as that of shielding from the electromagnetic radiations, generated by the electrical plants installed below such plasters, masonry or floors or fields produced outside the building.
  • Fig. 3 shows an absorbing tile 5 sectioned in the longitudinal direction, in the middle of the width thereof, in which it is noted that the entire tile is with the same blackened aspect of the one of fig. 1, whereas Fig. 4 shows an absorbing tile 5 with the same sectioned view of Fig. 3 on whose entire external surface there is applied the coating layer of white cement 6 of Fig. 2, in which in this case it is noted that the entire coating 6 appears white, whereas the front side 7 of the tile appears of the same blackened color of the tile of Fig. 2.
  • the raceway 8 is covered at its upper portion by a plug 12, secured on the raceway and having the same length thereof, in a manner to shield outward the electromagnetic radiations generated by the electric conductors 11.
  • This raceway 8 is obtained by pouring said mixture of materials into dies (not shown) shaped also with a different shape than the one described.
  • One example of application of these raceways 8 for housing electric conductors 11 may be below the floors of great shopping centers.
  • Fig. 9 shows a front perspective view of a raceway 8 with the same component parts of Fig. 5, and for the entire width thereof, and the electric conductors 11 housed inside such a raceway 8.
  • Fig. 6 shows now an absorbing tile 5 inside which there are embedded electric conductors 13, arranged aligned to each other for the entire length of the tile, and in this case this structural shape of the tile 5 is also obtained by pouring said mixture of materials directly on all electric conductors 13 inside suitable dies (not shown).
  • Fig. 7 and 8 show various absorbing tiles 5 according to the invention, identical and joined to each other, and ready for being installed in the desired positions, wherein in Fig. 7 all the tiles are without surface coating, whereas in Fig. 8 all the tiles are covered by a surface coating 6, identical to the one of Fig. 2.
  • Fig. 10 shows several absorbing tiles 5 identical and joined to each other in the direction of their width, and without surface coating, and in which there are embedded electric conductors 14, which are arranged aligned to each other for all the tiles, and this shape is also obtained as the one of the unique tile of Fig. 6.
  • Fig. 11 shows a tunnel-shaped apparatuses 15 of the industrial type, for treating products of various kind by microwaves, provided with absorbing tiles for the shielding against the electromagnetic waves.
  • This apparatus 15 for treating by microwaves is shaped with a loading structure 16 supported on the floor by two vertical supports 17 and 18, and shaped with a conveyor belt 19 for the products to be treated, with two vertical structures 20 and 21 delimiting a treatment inner chamber (not shown), and with a first and a second attenuator stage 22 and 23, arranged on the loading structure 16, and on each one of which said absorbing tiles 5, according to the invention, are fixed to (not visible in Fig. 11).

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Building Environments (AREA)

Abstract

L'invention concerne des dispositifs de blindage pour les ondes électromagnétiques, qui sont utilisés pour des applications industrielles de divers types, entre autres également dans un four à micro-ondes industriel (15). Les dispositifs comprennent une pluralité de carreaux absorbants (5) pour des rayonnements électromagnétiques, aptes à absorber l'énergie des ondes électromagnétiques ayant une longueur d'onde différente. Le carreau absorbant (5) est obtenu au moyen d'un mélange de matériaux destiné à la protection contre les rayonnements avec des variables de fréquences entre 2 et 3 GHz, comprenant par exemple du graphite, du noir de carbone, de la poudre de fer, du carbure de silicium, du ciment et de l'eau, ledit mélange étant versé à température ambiante dans des matrices spécifiquement façonnées. L'invention concerne différentes formes de fabrication de carreaux (5) et les positions dans lesquelles ils sont appliqués sur des fours à micro-ondes industriels (15).
PCT/IT2021/050124 2020-04-23 2021-04-21 Dispositifs de blindage pour les ondes électromagnétiques, qui sont utilisés pour des applications industrielles de divers types, et en particulier des carreaux absorbant les ondes électromagnétiques WO2021214810A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102020000008827A IT202000008827A1 (it) 2020-04-23 2020-04-23 Dispositivi di schermatura contro le onde elettromagnetiche, utilizzate in applicazioni industriali di diverso genere, ed in particolare piastrelle assorbitrici di onde elettromagnetiche
IT102020000008827 2020-04-23

Publications (1)

Publication Number Publication Date
WO2021214810A1 true WO2021214810A1 (fr) 2021-10-28

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PCT/IT2021/050124 WO2021214810A1 (fr) 2020-04-23 2021-04-21 Dispositifs de blindage pour les ondes électromagnétiques, qui sont utilisés pour des applications industrielles de divers types, et en particulier des carreaux absorbant les ondes électromagnétiques

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IT (1) IT202000008827A1 (fr)
WO (1) WO2021214810A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593491A1 (fr) * 2002-12-27 2005-11-09 Toray Industries, Inc. Produit stratifie, objet moule a blindage electromagnetique, et procedes de production de ceux-ci
CN110512754A (zh) * 2018-05-21 2019-11-29 中国建筑材料科学研究总院有限公司 具有三维结构界面的复合保温板及其制备方法
CN110550897A (zh) * 2019-10-09 2019-12-10 马鞍山海华耐磨材料科技有限公司 一种具有耐磨性的复合涂层材料

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593491A1 (fr) * 2002-12-27 2005-11-09 Toray Industries, Inc. Produit stratifie, objet moule a blindage electromagnetique, et procedes de production de ceux-ci
CN110512754A (zh) * 2018-05-21 2019-11-29 中国建筑材料科学研究总院有限公司 具有三维结构界面的复合保温板及其制备方法
CN110550897A (zh) * 2019-10-09 2019-12-10 马鞍山海华耐磨材料科技有限公司 一种具有耐磨性的复合涂层材料

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