21 results about "Electromagnetic shielding" patented technology

The invention discloses low-temperature conductive silver paste and a preparation method and application thereof. Silver nano wires and silver powder in conventional conductive silver paste are mixed to form novel low temperature conductive silver paste. The content of silver powder in conventional conductive silver paste is greatly reduced, and a few silver nano wires play good conductive effect. Conventional conductive silver paste requires circular silver particles which contact point-to-point to realize conduction, the silver nano wires can serially connect original silver particles, and the silver nano wires form a conductive network in a network shape. Conductive films, conductive switches, flexible print circuit boards, electromagnetic shields, potentiometers, wireless radio frequency identification systems and solar cells formed by the low-temperature conductive silver paste have better bending resistance performance.

The invention discloses a method for preparing stainless steel fiber resin matrix composite conductive plastics. A resin material contains stainless steel fibers accounting for 3-40% of the overall weight, epoxy emulsion and silane coupling agent compound treating fluid are used as interface compatilizers, and a resin material layer is uniformly coated on a stainless steel fiber surface, so that the stainless steel fiber resin matrix composite conductive plastics are prepared. The method includes the steps: performing surface treatment for the stainless steel fibers by the aid of the epoxy emulsion and the silane coupling agent compound treating fluid and drying the stainless steel fibers in a drying oven; pulling out the stainless steel fibers by the aid of a coating die to coat the resin material on the stainless steel fiber surface; and dicing the stainless steel fibers into particles by the aid of a dicing cutter to obtain particles of the stainless steel fiber resin matrix composite conductive plastics. The conductive plastics prepared by the method have excellent mechanical performance and electrical conductivity, and the lowest volume resistivity can be 10-1omega.cm. Coaxial flange method test results indicate that the electromagnetic shielding property of the conductive plastics with the thickness of 2mm ranges from 40dB to 65dB within the frequency range from 30MHz to 1000MHz.

The invention provides metal glass micron foil and a preparation method thereof. The preparation method comprises the steps that metal and a metal glass plate or strip are overlapped; an overlapped material is heated till the temperature reaches the metal glass supercooled liquid phase region which is between the glass transition temperature Tg and the crystallization temperature Tx; and then rolling calendaring is conducted, and the metal glass foil with the micron-scale thickness, namely the metal glass micron foil, is obtained. According to the preparation method, the metal glass foil can be quickly prepared on a large scale, the cost is low, and operation is easy and convenient; and the metal glass micron foil prepared through the method has utilization potentiality in the fields suchas sensors, sewage treatment, electronic skins, flexible smart wear, electromagnetic shielding, radiation resistance, catalyzing and composite materials.

The invention discloses a polypyrrole/nanometer platinum composite conductive fiber and a preparation method thereof. The method comprises the following steps of: performing treatment such as proper cleaning and the like on a fiber, soaking in an oxidant solution for 10 to 30 minutes, air-drying at room temperature or drying, putting the treated fiber into a sealed container filled with pyrrole steam, reacting at the temperature of between 0 and 30 DEG C for 5 to 30 minutes, respectively washing by using ethanol and deionized water, and air-drying or drying to obtain a conductive fiber A; and soaking the conductive fiber A in a chloroplatinic acid (H2PtCl6.6H2O) aqueous solution at the concentration of 0.1 to 1.0mol/L for 0.5 to 2 hours, dipping in pyrrole aqueous solution at the concentration of 0.01 to 0.1mol/L, reacting at room temperature for 6 to 10 hours, respectively washing by using ethanol and deionized water, and air-drying or drying to obtain the polypyrrole/nanometer platinum composite conductive fiber. The conductive fiber can be directly used for weaving and also can be blended with a common fiber in a ratio of 1:10-100 to prepare a fabric with an antistatic function and an electromagnetic screen function. The specific resistance of the polypyrrole/nanometer platinum composite conductive fiber is 103 to 107 omega.cm; and the polypyrrole/nanometer platinum composite conductive fiber has the antistatic function and the electromagnetic screen function.

The invention relates to the field of porous materials, and particularly discloses a high-thermal-conductivity pure porous silicon carbide material, and a preparation method and application thereof. The porous silicon carbide material is constructed by a three-dimensionally connected pure silicon carbide network and a three-dimensionally connected pore network in an interfingering mode, wherein the silicon carbide network is composed of silicon carbide crystal grains connected through grain boundaries to ensure high thermal conductivity of the porous silicon carbide material. By adopting the structure design and preparation method of the high-thermal-conductivity pure porous silicon carbide material, the high-thermal-conductivity pure porous silicon carbide material with adjustable pore size and porosity height can be obtained. The pure porous silicon carbide material is a novel porous material with simple preparation technology and high efficiency, has a wide range of application prospects, and can be used in the following fields such as composite material reinforcements, heat dissipation materials, electromagnetic shielding materials, wave-absorbing materials, filters, biologicalmaterials, catalytic carrier materials, electrode materials, and sound absorbing/noise reducing materials.

The invention discloses a preparation method of a heat-conducting, electricity-conducting and electromagnetic-shielding multifunctional composite material, and belongs to the field of preparation methods of multifunctional composite materials. According to the preparation method of the heat-conducting, electricity-conducting and electromagnetic-shielding multifunctional composite material, nanometer ferrite, graphene, copper powder, carbon black, nanometer silicon carbide and a high polymer material are added in a formula. By means of the preparation method of the heat-conducting, electricity-conducting and electromagnetic-shielding multifunctional composite material, the electromagnetic-shielding effect of the composite material can be improved, and the tensile strength, the compressive strength and other material performance of the composite material can be improved.

The invention provides an unfreezing device. The unfreezing device includes a cylindrical body, a device door body, a radio frequency generation module, an upper electrode plate and a lower electrodeplate; the cylindrical body is limited to have an unfreezing cavity having a forward opening and used for placing a to-be-processed object; the device door body is arranged on the forward opening of the unfreezing cavity and used for opening and closing the unfreezing cavity; the radio frequency generation module is configured to generate radio frequency signals; the upper and lower electrode plates are respectively and horizontally arranged on the top and bottom walls of the unfreezing cavity and electrically connected to the radio frequency generation module to generate radio frequency wavesof corresponding radio frequency in the unfreezing cavity according to the radio frequency signals and unfreeze the to-be-processed object in the unfreezing cavity; the cylindrical body and the device door body are respectively provided with electromagnetic shielding characteristics; and the electromagnetic shielding characteristic arranged on the cylindrical body and the electromagnetic shielding characteristic arranged on the device door body are arranged in conductive connection so as to reduce magnetic leakage from the unfreezing device when the device door body is closed. Thus, the magnetic leakage of the unfreezing device can be effectively reduced, and the harmfulness to users can be reduced.

The invention belongs to the technical field of electrochemical materials, and particularly relates to a preparation method of an electromagnetic shielding heat dissipation film. The method comprisesthe following steps of obtaining carbon nanotube films and graphene films; after at least one layer of the carbon nanotube films and at least one layer of the graphene films are alternately laminated,performing hot pressing treatment in a protective gas atmosphere of 2,800-3,000 DEG C for 8-10 hours to obtain a laminated function layer of carbon nanotubes and graphene; obtaining a base layer, andattaching the laminated function layer to one side surface of the base layer by using an adhesive; and obtaining a heat conduction adhesive, and applying the heat conduction adhesive to the other side surface, away from the base layer, of the laminated function layer to form a heat conduction adhesive layer, and obtaining the electromagnetic shielding heat dissipation film. The preparation methodof the electromagnetic shielding heat dissipation film is simple in process, easy to operate and convenient for industrial production and application.

The invention discloses a method for electromagnetic simulation of different error maps with a ray tracing algorithm, which mainly solves the problem of the undefined influence degree of different types of map error factors in geometric environmental information on an existing ray tracing model predicting result. The method is implemented by the following steps: (1) obtaining a required digital map corresponding to the outdoor micro-area environment; (2) respectively generating a plurality of building top offset error maps and wall translation error maps on the basis of the obtained map; (3) performing radio wave propagation simulation prediction on the original digital map and the error maps by adopting a ray tracing model, so as to obtain a mean value and a root-mean-square value of path losses of the top offset error maps and the wall translation error maps as well as the original digital map at each test point. According to the method, the influence degree of the different types of error factors in the geometric information on the precision of the ray tracing predicting result can be analyzed through the mean value and the root-mean-square value which are obtained through simulation, and reference is provided for radio wave propagation and channel prediction in an outdoor micro-area scene.

The invention discloses an electromagnetic type water heater and an electromagnetic resistance dual-core water heater, wherein the electromagnetic type water heater is formed by connecting a double-wall or sleeve or box-shaped magnetism-conductive water discharge body, a resonance coil and an integrated controller by virtue of power lines; and the electromagnetic resistance dual-core water heater is formed by connecting the water inlet of a resistance water heater and the water outlet of the electromagnetic type water heater, or placing the resistance water heater in the electromagnetic type water heater to be connected with and the integrated controller by virtue of power lines. For the electromagnetic type water heater and the electromagnetic resistance dual-core water heater, the magnetic energy in various directions of an electromagnetic field are scientifically utilized so that the energy efficiency is improved, and heat insulation is carried out on the resonance coil and the integrated controller by utilizing a heat insulation material and temperature difference of cold and hot water, and a dual-core simple and reliable technical structure in which a low-middle temperature zone is heated by electromagnetic energy and a mid-high temperature zone is subjected to resistance heating is adopted, thereby efficiently solving the problems that the resonance coil and the integrated controller are low in energy efficiency, low in hot water temperature, high in cost and the like, and can be easily damaged due to overheat. The electromagnetic type water heater and the electromagnetic resistance dual-core water heater have the obvious beneficial effects that the energy consumption is low, the cost is low, energy is saved, the hot water temperature is high, and more applications can be met.

The invention discloses a close coupled pump electromagnet with an electromagnetic shielding function. An electric coupler (4) is composed of a thread sleeve (5), a contraction sleeve (6), a rubber sleeve (7) and a tightening screw (8) sequentially; a cover (1), a conducting rubber ring (2), an electromagnet body (3), a wiring block (11) and an iron cover (13) are sequentially connected; the thread sleeve (5) of the electric coupler (4) is communicated with a round hole on the end face of one side of the electromagnet body (3) to form a T-shaped structure; the connection body of the iron core (13) and the wiring block (11) is arranged in the electromagnet body (3) in epoxy resin potting compound mode; a releasing-preventing spiral groove (27) is arranged on the inner cylindrical wall surface of the electromagnet body (3); and two flow guiding grooves (34) are arranged on the gap portion of a silicon steel sheet block (14). The close coupled pump electromagnet is of a full metal structure, has the electromagnetic protection function, and is good in electromagnetic compatibility, simple in structure, easy to form, high in reliability and convenient to maintain.

The invention provides an electromagnetic engine. The electromagnetic engine comprises a first shell and a second shell which is arranged on the first shell and communicated with the first shell, wherein a curved wheel assembly is horizontally arranged in the first shell; one end of the curved wheel assembly is connected with a small curved shaft connecting rod which penetrates through a side wall of the first shell, and the other end of the curved wheel assembly is connected with a first curved shaft connecting rod which extends out of another side wall symmetric to the side wall of the first shell; the part, extending out of the first shell, of the first curved shaft connecting rod is sleeved with a gear; the gear is meshed with a starting motor; the small curved shaft connecting rod which penetrates through the side wall of the first shell is connected with an electrode converter; connecting rods are arranged on the curved wheel assembly; the end portion of each connecting rod is connected with a movable permanent magnet; electromagnets corresponding to the movable permanent magnets in position are arranged on the upper end face of the second shell in a penetrating manner. The electromagnetic engine is simple in structure, solves the problem in the prior art that an electromagnetic coil is easy to polarize, and can provide a high-efficient durable power source for the electromagnetic engine.

A naked-eye 3D lens display device and a method for manufacturing the same are disclosed. The present disclosure relates to the technical field of 3D display, and particularly to a naked-eye 3D display technology. The technical problem that the lens of the display device in the prior art cannot be switched between 3D display mode and 2D display mode can be solved. The two electromagnetic shielding films are arranged facing each other. The frame and spacers are arranged between the two electromagnetic shielding films, and the frame and spacers and the two electromagnetic shielding films form a closed space. The electronically controlled magnetic poles are respectively arranged on two inner walls of the electromagnetic shielding films facing each other. The liquid medium is distributed in the closed space. The transparent magnetic particles are arranged in the liquid medium in the closed space. The display screen is fixed on an outer wall of either of the two electromagnetic shielding films. The beneficial effect lies in that, the naked-eye 3D lens can be switched between 3D display mode and 2D display mode. The 3D lens display device is light and thin, and has a good display effect and a low cost. The naked-eye 3D lens can be used in 3D display products.

The invention relates to a multifunctional device with electrochromic, electric heating and electromagnetic shielding functions. The multifunctional device comprises an electrochromic module, a connecting part, an electric heating and electromagnetic shielding module and a control module, wherein the connecting part is connected to one side of the electrochromic module; the electric heating and electromagnetic shielding module is connected to the other side of the connecting part, and the electrochromic module is connected to the electric heating and electromagnetic shielding module through the connecting part in order to form an integrated structure; and the control module is connected to the electrochromic module and the electric heating and electromagnetic shielding module, and the control module is used for respectively controlling the color changing of the electrochromic module and the heating and electromagnetic shielding of the electromagnetic shielding module. The electrochromic module is connected to the electric heating and electromagnetic shielding module through the connecting part in order to form the integrated structure, and the multifunctional device has the electrochromic, electric heating and electromagnetic shielding functions, and diversified functions and structural forms, so that the use requirements of different occasions can be met.

The invention provides an electromagnetic shielding cooling device, which comprises a frame main body (10). The making materials of the frame main body (10) comprise metal; the frame main body (10) has one or more cylindrical shielding cavities (11); the shielding cavity (11) is used for accommodating a shielded object; a plurality of frame channels (12) are distributed in the frame main body (10); and a heat transfer medium is in the frame channel (12). The electromagnetic shielding cooling device provided in the invention has good electromagnetic shielding and cooling functions at the same time.