4results about How to "Good electromagnetic shielding" patented technology

This invention discloses a room-temperature self-healing electromagnetic shielding hydrogel composite material and its preparation method, belonging to the field of composite material technology. The composite material uses polyvinyl alcohol containing aryl indole groups and conductive materials as raw materials, and ferric chloride and borax as crosslinking agents. Based on the steric hindrance effect introduced by the large-volume groups and the multiple dynamic bonds constructed in the system, this invention enables the composite material to exhibit highly efficient self-healing ability, high mechanical strength, and excellent electromagnetic interference shielding performance at room temperature. Through repeated wetting and drying treatments, the electromagnetic shielding efficiency of the hydrogel can be reversibly switched between on / off states, making it suitable for applications in flexible electronics and intelligent shielding, thus solving the problem that traditional hydrogel materials struggle to simultaneously achieve self-healing performance, mechanical strength, and electromagnetic shielding effectiveness.

The utility model discloses a kind of magnetic bearing control box, it is related to magnetic levitation energy storage flywheel system technical field, to solve the problem of poor compatibility of existing control box, heat dissipation and electromagnetic shielding deficiency. It includes the main body box of detachable top cover plate, first, second function area is separately arranged in box: first function area extends along the length direction of box body, installs drive circuit board and control circuit board;Second function area is located at opposite side, same along length direction extends, installs power supply circuit board and the metal mounting plate with hole array, hole array is compatible with 8 / 16 channel signal acquisition board, and cooperation replaceable identification plate realizes multi-specification adaptation. Through linear convection air duct, layered space and high-efficiency heat dissipation of openwork structure, folding edge shielding part strengthens electromagnetic protection. The design improves compatibility, reduces control box type, optimizes heat dissipation and shielding performance, applicable to multi-power segment magnetic levitation flywheel system. It is cost-effective, and heat dissipation and shielding performance are excellent, applicable to magnetic levitation energy storage flywheel system.

The application discloses an electromagnetic protection device for a car engine signal line, characterized in that the electromagnetic protection device comprises an engine signal protection circuit and a protection shell; wherein the engine signal protection circuit comprises a gas discharge tube, a transient voltage suppression diode and a filter circuit; the gas discharge tube is arranged at the front end of the engine signal protection circuit and is used for primary energy discharge; the transient voltage suppression diode is arranged at the middle section of the engine signal protection circuit and is used for fast response and voltage limiting protection; and the filter circuit is distributed at the middle section and the rear end of the engine signal protection circuit and is used for high-frequency interference suppression. The electromagnetic safety of the engine signal line can be comprehensively ensured, the reliability and stability of the vehicle control system are improved, and the maintenance cost is reduced.

This invention relates to a polyimide composite film, comprising: a carrier layer; a sputtered copper layer laminated to the surface of the carrier layer; an electroplated copper layer laminated to the surface of the sputtered copper layer; and an electroplated tin layer laminated to the surface of the electroplated copper layer. The carrier layer is a polyimide film with a thickness of 5-30 μm, the sputtered copper layer has a thickness of 0.5-2 μm, the electroplated copper layer has a thickness of 2-5 μm, and the electroplated tin layer has a thickness of 1-5 μm. The surface roughness Rz of the electroplated copper layer is 1-3 μm. This invention also relates to a method for preparing the above-mentioned polyimide composite film.