10results about How to "Realize the shielding effect" patented technology

The utility model relates to a mounting structure of PCB board large current conductor, this mounting structure includes metal base, PCB board, large current conductor and upper shell, the recessed groove for the large current conductor inlay is integrally arranged on the metal base, the PCB board sets up on the upper surface of metal base, the utility model discloses through embedding the large current conductor on the PCB board into the recessed groove inside the metal base, realizes the all -round metal surrounding and shielding of large current conductor, effectively avoids the electric field, magnetic field signal radiation to outside of the current on the large current conductor, realizes better EMC shielding effect.

The application belongs to the field of new materials, and discloses a lead-free perovskite X-ray shielding composite material and a preparation method and application thereof, and comprises the following steps: mixing ANF / DMSO dispersion liquid with ethanol to obtain re-protonated ANF dispersion liquid; mixing the re-protonated ANF dispersion liquid, CsI powder and ethanol, and stirring to obtain two portions of the same CsI / ANF dispersion liquid; mixing re-protonated ANF, Cs3Bi2I9 powder and ethanol, and stirring to obtain Cs3Bi2I9 / ANF dispersion liquid; sequentially filtering the first portion of CsI / ANF dispersion liquid, the Cs3Bi2I9 / ANF dispersion liquid and the second portion of CsI / ANF dispersion liquid by using a gel-gel method, and vacuum hot-pressing to obtain a composite gradient film with a biomimetic symmetrical structure, which is used as a lead-free perovskite X-ray shielding composite material; and the application realizes continuous and efficient X-ray shielding effect, and can improve the mechanical flexibility and thermal stability of the material.

The utility model relates to the technical field of frequency converter insulation and heat dissipation, and discloses a high-power frequency converter insulation and heat dissipation structure which comprises a bottom plate, foot columns and side columns, the foot columns are fixedly connected to the four corners of the upper surface of the bottom plate, and the side columns are fixedly connected to the middle portions of the two sides of the upper surface of the bottom plate. According to the high-power frequency converter insulation heat dissipation structure, the bottom plate, the foot columns and the side columns are combined to form a frame structure used for bearing the heat dissipation assembly and the frequency converter, meanwhile, the rigidity of the whole structure is enhanced, and the frame structure is made of a steel material, can be directly used for grounding and has heat dissipation, impact resistance and lightning stroke resistance performance; the outer side vacant part of the frame body is filled with the side plates, the top of the frame body is sealed and covered with the top plate, the side plates and the top plate are made of metal materials such as copper with high heat conduction performance and high conductivity, the heat dissipation and signal shielding capacity can be achieved, meanwhile, the interior of each side plate is a hollow outer layer, heat dissipation fins and arc-shaped pieces are installed, the heat dissipation area can be increased, and the heat dissipation efficiency is improved. And the heat dissipation effect is improved.

The utility model discloses a column-free magnetic cell sorting device which comprises a magnetic sorting mechanism, bases and moving mechanisms, the bases and the moving mechanisms are positioned on two sides of the magnetic sorting mechanism, each base is provided with one moving mechanism, the magnetic sorting mechanism comprises a supporting component, a magnetic component and a metal sleeve, and the magnetic component is fixedly arranged in the metal sleeve; a magnet structure of the magnetic assembly is a Halbach array, the top surface of the supporting assembly is used for placing a storage container in which a sample solution is stored, the supporting assembly comprises a base plate and a metal plate, a through hole penetrating through the length direction of the base plate is formed in the base plate, and the metal plate is accommodated in the through hole; the moving mechanism is used for pushing the metal plate to move in the length direction of the through hole. The column-free magnetic cell sorting device disclosed by the utility model can be used for effectively and controllably activating and shielding a magnetic field, and ensuring that an invalid magnetic field is weakened and the magnetic field intensity of a sorting area is enhanced in a working state, so that the magnetic cell sorting effect is improved.

The utility model relates to a protector and electronic equipment, and the protector is used for achieving the protection of a circuit element, and comprises a contact part which is used for making contact with the circuit element in a first direction; the grounding part is used for grounding the contact part; a connection portion connected between the contact portion and the ground portion; in the first direction, at least part of the contact part is located between the connecting part and the grounding part. According to the protector, the contact part making contact with the circuit element in the first direction and the grounding part making the contact part connected with the ground are arranged, the contact part and the grounding part are connected through the connecting part, a path for releasing static electricity is provided, interference of a static radiation field to the circuit element is reduced, and the shielding effect on the circuit element is achieved; meanwhile, at least part of the contact part is arranged between the connecting part and the grounding part in the first direction, so that the connecting part can bypass the side space of the protector to be connected with the grounding part, and occupation of the side space of the circuit element is reduced.

This invention relates to electrical component connection devices, and more specifically to the field of circuit board connection device technology. It discloses a circuit board fixing device for communication engineering construction, comprising a circuit board body with positioning holes and a positioning part. The positioning part includes a mounting base plate with a bottom groove and a recessed groove on its inner wall. Two leaf springs abut against each other to form elastic support. A pre-reserved gap in the wedge groove of the wedge block and compensation block allows the device to adapt to the thickness deformation of the circuit board due to temperature changes. Simultaneously, the tension spring drives the clamping ring to always abut against the surface of the circuit board. The elastic deformation of the leaf spring and the displacement compensation of the wedge structure work together to solve the problems of damage to the circuit board due to excessive clamping at high and low temperatures or displacement due to excessive clamping, achieving an adaptive and stable clamping effect for the circuit board under temperature-changing environments.

The application discloses a sealing mechanism with automatic rotating opening and closing function and belongs to the technical field of cabin sealing structure. The sealing mechanism comprises a cylinder body and sealing assemblies arranged on both sides of the cylinder body. The sealing assembly comprises a baffle, a pressing plate, a rotating pin shaft and an elastic assembly. The elastic assembly is arranged on the baffle and fixedly connected with the cabin at the other end. The baffle is provided with a first connecting sleeve. One end of the pressing plate is sleeved on the first connecting sleeve. The rotating pin shaft is coaxially arranged in the pin shaft through hole of the baffle, the first connecting sleeve and the pressing plate. The locking piece arranged on the side of the pressing plate is fixedly connected with the part of the rotating pin shaft inserted into the pressing plate, so that the pressing plate is fixedly assembled on the baffle. The conductive strip is glued on the arc end surface of the baffle and the pressing plate in contact with the cylinder body. The application realizes the functions of quick sealing and automatic resetting of the sealing mechanism without manual and mechanical actions.

The present application relates to the technical field of power system grounding fault detection, in particular to a single-phase grounding fault intelligent line selection method for a small-current grounding system of a distribution network, which locks a transient signal interception window through a zero-sequence voltage instantaneous value, accurately extracts a zero-sequence current high-frequency component signal corresponding to a high-frequency frequency band level by using discrete wavelet packet decomposition, and determines a morphological difference value based on an energy distribution deviation of a feeder compared with other feeders, so as to convert absolute magnitude discrimination into a comparison of frequency band distribution forms, and eliminate the interference of high-frequency transformation errors of underlying mutual inductors on a decision result; in combination with a total energy weight representing a physical scale of a signal, a morphological distribution artifact generated by weak white noise is identified and suppressed in a targeted manner; by fusing the morphological difference value and the total energy weight, deep mining of a fault branch distribution structure feature and adaptive shielding of noise interference are realized, so that the single-phase grounding fault intelligent line selection for the small-current grounding system of the distribution network is more accurate.

A zirconium hydride-based moderation shielding material containing gadolinium oxide / samarium oxide / europium oxide, its preparation method, and its application belong to the field of radiation shielding technology. It solves the problems of hydrogen loss, cracking, and poor thermal stability inherent in existing zirconium hydride materials. The material of this invention has a density of 5.58–5.71 g / cm³. 3 The hydrogen content is 1.6wt%~1.83wt%. The mass proportions of each substance in the total amount of ZrH2, Gd2O3, Sm2O3 and Eu2O3 are: 99%≤ZrH2<100%, 0%≤Gd2O3≤1%, 0%≤Sm2O3≤1%, 0%≤Eu2O3≤1%, 0%<Gd2O3+Sm2O3+Eu2O3≤1%. The hydrogen release initiation temperature is ≥557℃. Utilizing multi-element synergistic absorption, the shielding efficiency for 1MeV fast neutrons is ≥97.5%, and the thermal neutron proportion is reduced by ≥80%. It is suitable for small nuclear power reactors below 600℃.

The utility model discloses a case structure with a shielding layer structure, which comprises a frame and a conductive pattern, the frame is provided with a plurality of plate bodies and encloses a case body with an accommodating space inside, and the conductive layer is integrally formed with the plate bodies or covers the surfaces of the plate bodies; compared with an existing design, the relatively closed shielding body is defined by the multiple conducting layers, the conducting layers can be formed on all the frame bodies through the arranged conducting layers so that shielding and isolation of electromagnetism can be achieved, and meanwhile the multiple plate bodies can selectively cover or be directly formed in the plate bodies according to different positions; therefore, after a plurality of plate bodies provided with the conducting layers are installed on the frame, a closed virtual shielding body is formed, and the requirement for an existing EMC test is met.