12results about How to "Reduced eddy current effect" patented technology

The invention discloses a device and a method for laser crystal growth based on a seed crystal reentry method. The device comprises a furnace body and a control system, the lifting mechanism is arranged in the furnace body and is fixedly connected with the top of the furnace body; the lifting mechanism is connected with a seed crystal support, a rotating mechanism is arranged on the seed crystal support, and a torque detection device is arranged on the rotating mechanism; the seed crystal support is used for loading seed crystals; a crucible is arranged under the seed crystal, a plurality of heating units are arranged around the crucible, a rotating magnetic field generator is also arranged around the crucible, and a cooling system is arranged around the rotating magnetic field generator. According to the device and method for laser crystal growth based on the seed crystal reentry method, the eddy current phenomenon in the laser crystal growth process is effectively restrained by accurately controlling the intensity and frequency of the rotating magnetic field and optimizing magnetic field distribution.

This invention relates to the field of chemical production technology and discloses a cyclohexanone oxime rearrangement mixer structure, a numerical simulation model, and an analysis method. The cyclohexanone oxime rearrangement mixer structure includes a main structure, a circular ring, a cyclohexanone oxime inlet, and cyclohexanone oxime orifices. The main structure is vertical, with a circulating liquid inlet, a throat, and a mixture outlet arranged sequentially from top to bottom. A circulating liquid containing caprolactam, sulfuric acid, and SO3 flows into the main structure from the circulating liquid inlet. The circular ring is fitted onto the main structure and located between the circulating liquid inlet and the throat. To achieve thorough mixing of cyclohexanone oxime and the circulating liquid, the numerical simulation model is constructed using the Eulerian multiphase flow model and the Realizable k-ε turbulence model. The momentum ratio (MR) is used as an evaluation index for mixing effect, ensuring the momentum ratio is within a suitable range of 1-4, thereby achieving efficient mixing.

The invention discloses a transformer, and particularly relates to a high-efficiency mute type transformer which comprises a body, the body comprises a central stand column and edge stand columns, the central stand column and the edge stand columns are wound with windings respectively, and fixing rings used for fixing the body are arranged on the upper side and the lower side of the body. By arranging the 8-shaped silicon steel sheets and reserving the gaps among the 8-shaped silicon steel sheets, the heat dissipation performance of the transformer is effectively enhanced, meanwhile, the eddy current effect is reduced, and the overall operation efficiency is improved. The ceramic ring is used as a fixing ring, and vibration and noise transmission can be effectively reduced due to the characteristics of ceramic materials. In addition, sponge blocks are installed at the air inlet hole and the air outlet hole of the box body, so that noise generated during air flowing and fan operation is further reduced.

The invention discloses a gradient coil cooling and supporting device and a permanent magnet type magnetic resonance system, and relates to the technical field of magnetic resonance imaging, the gradient coil cooling and supporting device comprises a supporting heat dissipation layer, and a first cooling channel is arranged in the supporting heat dissipation layer; a gradient coil and a protruding structure are fixedly arranged on the inner wall or the outer wall of the supporting heat dissipation layer, the protruding structure is matched with a gap of the gradient coil in an embedded mode, and a second cooling channel communicated with the first cooling channel is formed in the protruding structure. The permanent magnet type magnetic resonance system comprises a main magnet, a cooling supporting device and a radio frequency coil which are sequentially arranged from outside to inside, and the radio frequency coil surrounds to form a detection space. According to the gradient coil, the inner wall or the outer wall of the supporting heat dissipation layer is provided with the protruding structure which is matched with the gap of the gradient coil in an embedded mode, the first cooling channel and the second cooling channel which are used for circulation of the cooling medium are arranged in the supporting heat dissipation layer and the protruding structure, a cooling structure and a supporting structure are combined into a whole, and the overall size of the coil is optimized.

A rotor unit, a rotor, and a motor structure. The rotor unit (100) comprises: a rotor lamination (101); a plurality of magnetic steel units (102) consisting of magnetic steels (103) and located on the rotor lamination (101); and hole structures (104) located in the magnetic steels (103). The rotor unit and a flow guide disc together form a rotor assembly. The motor structure comprising a special cooling channel is formed in combination with a hollow shaft and the hole structures. The structure can directly cool the magnetic steels, a rotor iron core, and an end portion of a stator winding at the same time, and has a good cooling effect.

The present invention discloses an automatic shunting device for live bypass operation of a distribution network, comprising a reel with a drain wire wound thereon, and a plurality of movable frames, wherein the movable frame is slidably connected to one side of the conductor, and the insulating layer of the conductor is broken by the movable frame to perform bypass connection between the conductor and the drain wire; the movable frame comprises a slideway, a slide plate, a clamping wheel group, a drain wire lap joint and an insulation cutting assembly; the slideway is fixed to one side of the conductor, the slideway is parallel to the extension direction of the conductor, and the slide plate is slidably hoisted under the slideway; both ends of the side wall of the slide plate are rotatably connected with the clamping wheel group, the middle part of the slide plate is adjusted and connected with the insulation cutting assembly, and the middle part of the slide plate is movably connected with the drain wire lap joint. The present invention can realize the automatic bypass connection of live conductors of different directions and spacings, avoid the risk of electric shock caused by close contact between people and live parts, ensure that both ends of the drain wire are simultaneously hung to the position of the metal conductor leaked after the insulation sheath of the conductor is stripped, and has a simple structure and is easy to implement.

The invention relates to a controller, in particular to an air cooling and water cooling controller. An air cooling and water cooling controller comprises a controller body and a heat dissipation and cooling assembly detachably arranged on the controller body. The invention aims to provide an air-cooling and water-cooling controller which is simple in structure, higher in efficiency and capable of switching quickly.

The invention provides an inner rotor permanent magnet motor, and relates to the technical field of permanent magnet motors, the inner rotor permanent magnet motor comprises a stator winding and a rotor core, a plurality of magnetic pole groups are fixed on the circumferential surface of the rotor core along the circumferential direction, a plurality of magnetic pole blocks with the same polarity are arranged in the magnetic pole groups, and the polarities of the magnetic pole blocks in adjacent magnetic pole groups are opposite; by adopting the radial segmentation design of the magnetic poles, the adjacent magnetic pole groups with opposite polarities comprise a plurality of magnetic pole blocks with the same polarity, so that the stress borne by the magnetic pole blocks in the high-speed rotating process is obviously reduced, and the breaking risk of the magnetic pole blocks is reduced; by arranging the small magnetic pole blocks, magnetizing is more uniform, magnetic flux loss is smaller, and more efficient magnetic field utilization is ensured.

This invention discloses an MRI passive shimming optimization method based on the PSA-SQP hybrid algorithm, comprising the following steps: (1) Magnetic field mapping to evaluate the uniformity of the magnetic field: the magnetic field non-uniformity at a specific sampling location within the imaging area is evaluated using a magnetic field probe / camera; (2) Establishing an optimization model for passive shimming; (3) Hybrid algorithm optimization of passive shimming: combining the pattern search algorithm PSA with sequential quadratic programming SQP to find the optimal solution for the iron block in the passive shimming system. PSA is run in advance to perform a global search, obtaining elite individuals as initial values ​​for SQP optimization, and then the optimal solution for the iron block in the passive shimming system is found by running SQP. This algorithm can achieve high magnetic field uniformity and also has limitations on the weight of the shimming iron sheet. Importantly, it can achieve a sparse distribution of the shimming iron sheet.

The application discloses a permanent magnet with an insulation layer and a preparation method and application thereof, the permanent magnet is provided with a separation groove, the groove of the separation groove is filled with an insulation layer, and the insulation layer can be a glue layer, an expansion coating, an injection agent or the like insulation material. According to the reasonable regulation and control of the three-dimensional direction size and filling rate of the separation groove, different strength permanent magnets can be accurately obtained according to target requirements, so that the permanent magnets are suitable for different application scenarios and cost can be saved. Meanwhile, the vacuum pressing process is adopted to fill the insulation layer in the separation groove of the permanent magnet, so that the permanent magnet with different shapes, widths and depths of the separation groove can be suitable, the filling rate of the insulation layer (such as glue) in the separation groove of the permanent magnet is high, so that the mechanical performance of the permanent magnet is guaranteed; meanwhile, the flatness of the insulation layer after filling of the separation groove and the surface of the permanent magnet can be improved after vacuum treatment, and the overall corrosion resistance of the product is further improved.

The invention discloses a magnetic resonance passive shimming optimization method based on a GA-SQP hybrid algorithm, and the method comprises the steps: firstly operating a GA algorithm, operating a GA number generation (the generation is far smaller than the generation which is operated when the GA is independently used), and then switching to the SQP algorithm. And the SQP algorithm can quickly find a globally optimal solution or a final solution close to the globally optimal solution. According to the method, the uniformity of the main magnetic field can be greatly improved, the requirement of high-quality imaging can be met, meanwhile, the limitation of the total amount of shimming iron sheets can be met, the weight of the iron sheets required for magnetic field uniformity is reduced by adopting a regularization method, and sparse shimming iron sheet distribution is obtained.

The invention provides a baby incubator and a baby culture transfer imaging system, and relates to the technical field of medical treatment. The infant incubator comprises a base, an infant cabin, an air duct structure, a flow driving device, a heating device and a heat exchange device, two ends of the air duct structure are respectively communicated with an air inlet and an air return port of the baby cabin to form an air flow circulation path; the heating device is at least partially located in an inner cavity of the air duct structure so as to heat fluid in the air duct structure. The flow driving device comprises an airflow driving part and a driving unit, the airflow driving part is located in an inner cavity of the air duct structure, the driving unit is in driving connection with the airflow driving part, and the driving unit comprises a non-magnetic motor; the heat exchange device is thermally coupled with the driving unit and airflow in the air duct structure, and the thermal coupling position of the airflow in the air duct structure and the heat exchange device is located on the upstream of the heating device.