75 results about "Magnetic field effect" patented technology

The invention relates to the technical field of burn and scald treatment, in particular to an intelligent hydrogel dressing for targeted regulation and control of Mongolian medicine release. The dressing comprises a core-shell microsphere drug loading system used for realizing physical segmentation of a functional area; the dual-release system is used for realizing surface adsorption of quick-release drug nanoparticles and internal wrapping of sustained-release microspheres; a hydrogel matrix for forming a nanofiber network; and the magnetic control regulator is magnetic nanoparticles dispersed in the hydrogel matrix, and regulates the aperture of the hydrogel network through the action of an external magnetic field. According to the intelligent hydrogel dressing for targeted regulation and control of Mongolian medicine release, the Mongolian medicine compound intelligent hydrogel dressing is developed on the basis of a TRIZ innovative method; through a core-shell microsphere drug loading system and a dual release design, high drug loading capacity and accurate drug release control are synchronously realized.

The invention relates to the technical field of water treatment, in particular to active water treatment equipment based on a magnetofluid field effect. The device comprises a water treatment assembly for temporarily storing to-be-treated water and performing active treatment on a water body by using an electric field and / or a magnetic field, a water conveying assembly mounted and connected to the water inlet end and the water outlet end of the water treatment assembly and used for continuously conveying water flow into the water treatment assembly, and a magnetic field generating assembly mounted on the outer side of the water treatment assembly and used for generating magnetic field generated by the water treatment assembly. The magnetic field generating assembly is used for generating a magnetic field effect to act on water in the water treatment assembly, and the electromagnetic field control assembly is connected with the water treatment assembly and the magnetic field generating assembly through wires and used for controlling the water treatment assembly and the magnetic field generating assembly to generate an electric field and / or a magnetic field effect and treating the water. The water storage device is surrounded by a plurality of paired electromagnetic field generators from top to bottom, after the electromagnetic field generators are electrified to generate a magnetic field, the magnetic field action is performed on water flowing through the water storage device, and the treated water flows out through the water outlet electricity-proof wall water inlet pipe.

The utility model relates to hydrogen fluoride production technical field discloses a pipeline descaling system for hydrogen fluoride production, include: evaporative cooling device has the accommodation cavity, fills with domestic water in the accommodation cavity, the cooling pipe inside fills with freon, first pipeline sets up the outside of evaporative cooling device, the import of first pipeline communicates with the below outside end surface of evaporative cooling device, and the export of first pipeline communicates with the outside end surface of the above of evaporative cooling device, first pipeline circulates domestic water through the drive part, and the parallelly connected setting of permanent magnet descaling device is in first pipeline, the utility model discloses through setting permanent magnet descaling device, utilizes the magnetic field effect, changes the scale layer crystallization form, makes it difficult to adhere to the pipe wall, the freon in cooling pipe can more efficiently carry out the cooling at this moment, and the heat exchange effect is high.

This invention provides an ultrasonic-gradient magnetic field synergistic treatment device and method for edible liquids, relating to the field of edible liquid processing technology. The device includes an ultrasonic treatment unit, a gradient magnetic field treatment unit, and a closed-loop enhanced circulation unit connecting the two. The ultrasonic treatment unit is used to cavitation the liquid; the gradient magnetic field treatment unit includes a magnetization channel and a magnetic field generating component, the magnetic field generating component being used to form a continuously varying magnetic field distribution along the liquid flow path within the magnetization channel; the closed-loop enhanced circulation unit is used to create a directional circulating flow of the liquid between the ultrasonic treatment unit and the gradient magnetic field treatment unit, ensuring that the liquid passes through the ultrasonic action area at least twice within one circulation cycle, thereby allowing the liquid to alternately receive ultrasonic and gradient magnetic field effects during circulation, forming a nonlinear cumulative synergistic treatment effect. This invention helps improve the uniformity and processing effect of edible liquids.

The invention discloses a light collimator based on magnetic particles and low-melting-point glass and a manufacturing method thereof. The manufacturing method comprises the following steps: uniformly mixing a low-melting-point glass raw material and the magnetic particles; the melting point of the low-melting-point glass is 300 DEG C to 500 DEG C; placing the obtained mixture in a heating device, and controlling the heating temperature to be within the melting point range of the low-melting-point glass raw material and to be lower than the Curie temperature of the magnetic particles; then adding a dispersing agent; pouring the uniformly mixed solution into a mold, and placing the mold in a uniform magnetic field with an unchanged magnetic field direction, so that the magnetic particles are arranged into a plurality of chain-shaped aggregates parallel to the magnetic field direction under the action of the magnetic field, and the chain-shaped aggregates are parallel to one another; and after complete cooling and solidification, the magnetic field effect is removed, and the optical collimator based on the magnetic particles is manufactured. Therefore, the technical problems that an existing optical collimator is poor in high temperature resistance and corrosion resistance and limited in light-transmitting wave band are solved.

The utility model relates to the technical field of simple harmonic motion analysis under the action of a magnetic field, in particular to a simple harmonic motion analysis device and equipment based on a torsional pendulum under a magnetic field condition, and the device comprises a magnetic field torsional pendulum mechanism, a data acquisition mechanism and a control mechanism, the magnetic field torsional pendulum mechanism comprises a torsional pendulum assembly and a magnetic field generation module, and a metal ball in the torsional pendulum assembly is located in a magnetic field generated by the magnetic field generation module. The data acquisition mechanism comprises an encoder and a photoelectric door, and the encoder is mounted on a rotating shaft of the metal ball and is in contact with the metal ball; the photoelectric door is arranged on a motion path of the metal ball, and when the encoder synchronously rotates along with the metal ball, the edge of a coded disc of the encoder passes through a detection area of the photoelectric door; and the control mechanism is connected with the encoder and the photoelectric door. According to the utility model, automatic data acquisition and processing can be realized, and the motion state of the pendulum ball can be accurately monitored in real time.

The utility model provides a magnetic fresh-keeping container and refrigeration equipment. The magnetic fresh-keeping container comprises a storage device provided with a storage space; the at least one magnetic field device is pivotally connected with the storage device and used for generating a magnetic field in the storage space, and the magnetic field device is provided with a first position covering at least part of the storage space in the first direction and a second position covering at least part of the storage space in the second direction; the rotating shaft rotates relative to the storage device and is switched between a first position and a second position, and the first direction is perpendicular to the second direction. The magnetic field device can generate a magnetic field in the storage space at the first position and the second position. Namely, the magnetic field device can enable the food materials in the storage space to be subjected to the magnetic field effect in the low-temperature storage process at the first position and the second position, the magnetic field fresh-keeping effect is achieved, the fresh-keeping effect of the food materials is improved, and more flexible magnetic field configuration can be provided.

The invention belongs to the technical field of ice resistance of wind power generation equipment, and particularly relates to a magnetorheological fluid self-adaptive ice-resistant wind turbine blade and a control method.The wind turbine blade comprises a shell, and a girder, rib plates connected with the girder, core materials spaced from the rib plates and electromagnets connected with the rib plates are installed in the shell; wherein a cavity area is formed in the front edge area of the shell, an MRF interlayer and a skin which are attached to each other are installed in the cavity area, and a PLC used for controlling the electromagnet is installed at the root of the shell; when the electromagnet is started, the MRF interlayer is solidified through the magnetic field effect of the electromagnet so as to extrude the ice layer attached to the outer portion, otherwise, the electromagnet is dormant, the MRF interlayer is made to recover to be in the liquid state, and therefore the pneumatic form of the blade is maintained after deicing. The control method comprises steps 1-7. The transient curing characteristic of the magnetorheological fluid under the action of a magnetic field is utilized, the surface morphology of the blade is dynamically regulated and controlled, the continuity of an ice layer is destroyed, and meanwhile pneumatic smoothness is recovered in an ice-free state.

The utility model discloses a magnet device for magnetron sputtering coating, which belongs to the technical field of magnetron sputtering coating, and comprises a back plate, a magnetic bar base and magnetic bars, the magnetic bar base is connected onto the back plate through a plurality of adjusting bolts, the magnetic bar base is provided with three horizontal clamping grooves for correspondingly placing the magnetic bars, the magnetic bars comprise square tubes, and the square tubes are arranged in the clamping grooves. The magnets are arranged in the square tubes, and the magnetic poles of the magnets arranged in the adjacent square tubes face opposite directions. A fixing position is provided through the effect of the back plate, the generated peripheral magnetic field intensity is changed by adjusting the distance between the magnetic rod base and the back plate, the collision ionization effect is changed, the thickness of the film layer is adjusted accordingly, and the production application range is wide; the magnet device adopts the stainless steel square tube to package the magnet, effectively prevents the magnet assembly from being damped and corroded, ensures the position stability of the magnet, avoids the influence of position change on the magnetic field effect, and improves the stability and reliability of the device; and the magnet is convenient to disassemble and assemble and can be reused, so that the production cost is reduced.

The invention relates to the technical field of loader electronic scales, in particular to a loader electronic scale calibration device which comprises a vehicle body, a loading frame is arranged at the front end of the vehicle body, loading hydraulic rods for controlling a loading hopper to rotate and lift are arranged on the loading frame, and a communicating pipe is arranged between the loading hydraulic rods. A weighing mechanism used for weighing the loading vehicle and the weight of goods unloaded from the bucket is arranged in the position, close to the communicating pipe, of the wheel damping and loading frame of the vehicle body, and a calibration adjusting mechanism used for calibrating and adjusting the electronic scale is arranged in a cab of the vehicle body. The adjusting telescopic rod pushes the limiting rod to start to move, the limiting rod does not extrude the sliding block any more, the adjusting magnetic ring installed on the electric brush ring at the lower end of the sliding block drives the electric brush ring to move under the magnetic field effect of the calibration magnetic ring, after the calibration magnetic ring and the adjusting magnetic ring are attracted and attached, data calibration returns to zero, and therefore a worker can calibrate the electronic scale more conveniently.

The utility model provides machine tool constant pressure equipment, and belongs to the technical field of machine tool constant pressure. Comprising a bottom plate; the buffer area is arranged on the bottom plate; the pump body is arranged on the buffer area; the connecting piece is arranged at the output end of the pump body in a communicating mode. Through the arrangement of the connecting piece, when pump body pulsation enables cooling liquid pressure and flow velocity fluctuation to be transmitted to the connecting piece, the inner layer can effectively absorb initial pressure impact and high-frequency vibration, a first buffering defense line is provided, when the impact is transmitted to the middle layer, the flexible damping fin starts to deform, vibration energy is further absorbed, and the vibration energy is further absorbed. Meanwhile, the magnetic field intensity is changed by the electromagnetic coil, so that the magnetorheological material is gradually hardened under the action of an initial magnetic field, vibration energy is effectively absorbed and dissipated, the influence of pulsation on the pressure of cooling liquid in the conveying pipe is reduced, and pipeline damage is reduced.

The invention discloses a thyristor branch current detection circuit based on a magnetism gathering effect. The thyristor branch current detection circuit comprises a power supply module, a magnetism gathering device, a magnetic field conversion device, a voltage dividing module, an integrated operational amplifier module and a microcontroller, the magnetism gathering device is used for directionally gathering an annular magnetic field generated by the thyristor branch current; the magnetic field conversion device is mounted on the magnetic gathering device and is used for converting the gathered magnetic field into first voltage; the voltage division module is connected with the power supply module; the integrated operational amplifier module is respectively connected with the voltage dividing module and the magnetic field conversion device; and the microcontroller is connected with the integrated operational amplifier module. According to the invention, the magnetic gathering device is coupled with the wire through the magnetic field, and the magnetic field conversion device is coupled with the magnetic gathering device through the magnetic field without any electrical connection, so that the problem of branch open circuit caused by detection is fundamentally avoided, the open circuit risk existing in the traditional technology is solved, and the working state of the system can be judged by monitoring the change of the reference voltage under the static working condition.

In one aspect, an angle sensor includes a first linear sensor and a second linear sensor. A first magnetic-field direction of a target magnet measured by the first linear sensor is substantially equal to a second magnetic-field direction of the target magnet measured by the second linear sensor. The first linear sensor, the second linear sensor and the target magnet are on an axis. The angle sensor determines an angle of a magnetic field.

The application provides a cementing plug releasing device, method and system, which comprises a main body, a releasing cavity in the main body, a releasing opening on one side of the releasing cavity, a plug body arranged in the releasing cavity and having magnetism, and a pointer assembly arranged on the main body and having a freely rotating pointer, which can be limited from freely rotating by the magnetic field of the plug body in the releasing cavity. According to the technical scheme of the application, the plug releasing can be quickly, accurately and intuitively judged by the change of the posture of the pointer based on the magnetic field effect, and correct decisions can be made on the basis of accurate judgment, so as to ensure the safety of cementing construction and the quality of cementing.

The utility model discloses an electrified coil magnetic field effect demonstration device which comprises a wire duct, a cross beam, an upper buckle, a lower buckle, a footstand, a connecting plate, a threading hole, a binding post clamping groove, a binding post and a coil. Compared with the prior art, the device disclosed by the utility model is lower in overall cost and simpler and more convenient in production process, and achieves the effects of small size, light weight, convenience in carrying and simplicity in operation on the premise of ensuring the experiment effect. After the device is electrified, the magnetic needle base and the magnetic needle can be arranged outside and inside the connecting plate and can move freely, so that magnetic effect differences of different positions of the electrified coil can be observed conveniently, and teaching and learning are facilitated.

The invention discloses a collateral dredging chair which comprises a seat plate and a leaning frame, a square groove is formed in the middle of the seat plate, a detachable metal support is arranged at the top of the leaning frame, threading holes which are evenly distributed are formed in the leaning frame, the threading holes are used for threading and binding a cloth pad, jade can be contained in the cloth pad, jade can be contained in the square groove, and jade can be bound to the metal support. The metal support comprises a fastener at the bottom, and the fastener is fastened to the top of the leaning frame. The device has the advantages that the magnetic field effect of jade and resonance of light wave vibration frequency are used for jointly improving energy of a human body, and the purposes of dredging back meridian points and meridian points in a front pulsator area, healing the body, repairing injuries and recovering health are achieved.

The invention relates to a device and a method for magnetic field assisted photochemical mechanical polishing of a semiconductor wafer. Comprising a portal frame, an ultraviolet irradiation unit, a magnetic applying wafer spindle unit, a workbench, a liquid storage tank, a finishing wheel unit and a magnetic applying polishing disc unit. And the wafer is arranged on the magnetic applying wafer main shaft unit and is adsorbed on the connecting flange through vacuum. Ultraviolet light penetrates through the magnetic applying polishing disc to directly irradiate a wafer, meanwhile, the electromagnet is powered on to apply a uniform strong magnetic field, the wafer is soaked in polishing liquid, and an oxide layer on the surface of the wafer is removed under the coupling action of a light field, the magnetic field and a mechanical field. Ultraviolet light irradiates the surface of a semiconductor wafer to generate electron hole pairs, and then a magnetic field effect is introduced into a system to inhibit recombination of the photo-generated electron hole pairs, so that the hole survival time is prolonged, and the photochemical mechanical polishing efficiency is improved. The optical field and the magnetic field are applied to chemical mechanical polishing at the same time, and the material removal rate and the polishing quality are improved.

The present invention discloses a high-precision electric power measurement meter suitable for complex load environments, and relates to the technical field of electric power measurement. The present invention achieves high-precision monitoring of current by utilizing the magnetic field caused by current and the polarization change of light. The device structure adopts a dual magnetic field effect to improve stability, and reduces external interference through a vacuum-sealed environment, thereby ensuring the accuracy of the measurement results. At the same time, the modular design makes the device more adaptable in different environments and easy to adjust and maintain. The electric power measurement meter of the present invention has higher accuracy, stronger adaptability and longer service life, and is suitable for current monitoring of complex loads.

The present invention discloses a high-current common-mode inductor and a preparation method thereof. The core material of the wound magnet of the present invention is an FeCo composite material, which has a greater saturation magnetic flux density and greatly improves the working current of the product. At the same time, by doping Si and B elements, the grain size inside the particles can be refined to reduce eddy current and increase the use frequency of the material, so that FeCo materials can be used at frequencies of hundreds of kHz. A dense coating layer is formed between particles through a composite coating of nano-oxides, phosphates and borosilicate glass to further reduce eddy currents between particles and increase the application frequency of the material. The effective inductance value of the inductor is increased while the leakage current is reduced through the packaging structure, reducing the superimposed magnetic field effect of the leakage current and the working current, thereby achieving the effect of improving the working current of the product, meeting the device's requirements for common-mode inductor filtering performance, and is particularly suitable for application scenarios of high-power circuit filtering.

The invention provides a refrigerator ice maker and an ice making method thereof, and particularly relates to the technical field of refrigeration equipment. The ice maker comprises a base, an ice making assembly and a motor, the base is provided with an air inlet and a water filling nozzle; the motor is mounted at the rear end of the base; an output shaft of the motor is inserted into the rear end of the ice making assembly; the front end of the ice making assembly is rotationally connected with the front side wall of the base; the ice-making assembly comprises an ice-making bottom box and an ice-making grid, and the ice-making grid is movably arranged at the top of the ice-making bottom box; an electromagnetic component is arranged at the bottom of the ice-making bottom box, and a permanent magnet is arranged between the ice-making bottom box and the ice-making grid and corresponds to each electromagnetic coil of the electromagnetic component; and the ice-making grids are connected with the ice-making bottom box in a sucking manner or are separated from the ice-making bottom box in a lifting manner under the action that like poles repel each other or opposite poles attract each other of the electromagnetic coils and the permanent magnets. A traditional ice-making box is divided into two parts, and water in the ice-making bottom box is uniformly distributed under the action of a magnetic field in cooperation with a plurality of vertically-through ice lattices, so that ice blocks with the same size are obtained.

The invention discloses a bilateral permanent magnet fault-tolerant permanent magnet vernier motor and a torque increasing and eddy current loss reducing coupling analysis method thereof. Based on harmonic magnetic field analysis, contribution of each harmonic to torque and distribution characteristics of permanent magnet eddy current loss are decomposed, and classification control is carried out on the harmonic through comprehensive parameter optimization. The method specifically comprises the steps that a rotor adopts a consequent pole design, and a bidirectional magnetism gathering effect is formed by combining a stator split tooth embedded reverse Halbach array permanent magnet; based on magnetic field harmonic decomposition, contribution rates of different harmonic orders (such as 3, 7, 23 and the like) to output torque are quantified, and key gain harmonics and loss harmonics are identified; a permanent magnet eddy current loss model is established, and the proportion of specific harmonic orders (such as 10 times, 20 times and the like) to permanent magnet eddy current loss is deduced in combination with harmonic frequency and amplitude. A harmonic torque-loss tradeoff coefficient is defined, the harmonic amplitude, frequency and loss density are combined, risk grading is carried out on each harmonic of the motor, and the design priority is guided.

A magnetic implant device (1), which provides analgesic effects by increasing nitric oxide synthesis using pulsed magnetic field effects, accelerates the fusion of an implant with a bone and eliminates the negative effects of foreign bodies within the tissue, comprising: at least one coil (2) generating pulsed magnetic field effects; a control unit (7), which accelerates the bonding of the dental implant to the bone by means of the magnetic effect generated by said coil (2), allowing a change in the electromagnetic field strength of the generated pulsed magnetic field, and which has an adjustment button to adjust the frequency and power of the magnetic implant device (1), and a switch button to open and close the device, an applicator (9), which is adapted to the form of the jaw bone, the device can be used for treating all teeth of the upper and lower jaws, and provides uniform pulse electromagnetic effect for the application area of the device.

The invention provides a foundation pit leakage detection device and a leakage judgment and positioning method. The leakage detection device comprises a magnetic excitation well, a magnetic excitation system, magnetic field measurement cloth, a simulated electromagnetic field data processing system and a control analysis system. The magnetic excitation system applies excitation current in the magnetic excitation well; the control analysis system carries out comparative analysis on a measurement result and a simulation result of the magnetic field, and if 90% or more data errors are smaller than 0.05, leakage is judged to be generated; the magnetic excitation system further comprises an electrode, and when leakage is judged through the judgment method, the diaphragm wall seam position corresponding to the depth where the electrode is located is the leakage position. Based on the current magnetic field effect, an original precipitation well is utilized, a large-range magnetic induction field is established, the leakage point position at the joint of the underground diaphragm wall is rapidly found, traditional salvage needle type low-efficiency detection is avoided, and in addition, the detection system can be moved.

The utility model relates to a modularized automatic deironing device, which comprises a plurality of deironing modules, each deironing module comprises a shell component, an iron removal space is arranged in the shell component, and a first joint and a second joint are respectively arranged on the wall surface of the shell component; the magnetic rod assembly is mounted in the iron removal space and is used for removing iron from the slurry in the iron removal space based on the action of a magnetic field; the first joint of one iron removal module is connected with the first joint of another iron removal module, and / or the second joint of one iron removal module is connected with the second joint of another iron removal module, so that the plurality of iron removal modules are connected in series, and the slurry sequentially flows through the iron removal spaces for iron removal. By arranging the multiple iron removal modules and the liquid drainage pipeline, any number of iron removal modules can be connected in series, the compatibility and use flexibility of the iron removal device are effectively improved, and the iron removal device is suitable for various use working conditions.

The utility model provides a fresh-keeping storage device and refrigeration equipment. The fresh-keeping storage device comprises a storage container provided with a storage space; the magnetic field device comprises a magnetic field generating piece which is used for generating a magnetic field in the storage space; one of the telescopic piece and the stopping piece is arranged on the magnetic field device, the other one of the telescopic piece and the stopping piece is arranged in the storage container, and the telescopic piece can abut against the stopping piece so that the magnetic field device can be installed in the storage container and can be disengaged from the stopping piece through contraction movement so that the magnetic field device can be disengaged from the storage container. In other words, the telescopic part and the stop part are matched with each other, so that the magnetic field device can be detachably installed in the storage container, the magnetic field device installed in the storage container can generate a magnetic field in the storage space, and therefore food materials in the storage space are subjected to the magnetic field effect in the low-temperature storage process, and the magnetic field fresh-keeping effect is achieved; the fresh-keeping effect of the food materials is improved.

The application provides a strong effect pre-prepared magnetic field laying system and laying method, which comprises a power supply arranged outside a drill hole, a control system, a traction mechanism and a laying probe placed in the drill hole; the laying probe comprises a shell and a conveying device, a rotating device and a telescopic top stretching device fixedly connected in the shell; a laying work window is arranged on the shell; the conveying device comprises a servo motor, a synchronous pulley, a pulley shaft, a pulley bearing, a synchronous belt and a plurality of insulating fixed grooves fixed on the synchronous belt; the synchronous belt is arranged along the height direction of the laying probe; the rotating device comprises a motor, a main shaft and a base fixedly connected to the main shaft, and the main shaft is horizontally arranged; the top stretching device is fixedly connected to the base, and the top stretching device comprises a grabbing groove and an electromagnetic sheet arranged in the grabbing groove. The application can effectively solve the problems of small pre-prepared magnetic field effect, weak monitoring signal and poor detection stability, and can meet the application scene of large displacement of deep deformation of landslide.

The utility model relates to the technical field of automobile ignition systems, in particular to an improved double-layer magnetic circuit ignition coil device which comprises a device body, the device body comprises an aluminum plate, a plurality of mounting holes are formed in the aluminum plate, and the aluminum plate is mounted and fixed through the mounting holes; a first high-magnetic-conductivity strip and a second high-magnetic-conductivity strip are arranged above the aluminum plate, and the first high-magnetic-conductivity strip and the second high-magnetic-conductivity strip are matched with each other to form a double-layer magnetic circuit structure; a first enameled wire and a second enameled wire are arranged in the double-layer magnetic circuit structure in a matched mode. According to the utility model, the magnetic field effect is improved through the double-layer magnetic circuit design, current stability is ensured by adopting high-performance enameled wires, heat dissipation is optimized by utilizing multiple assemblies, and the safety is enhanced; the built-in thermistor monitors the temperature in real time, the silica gel pad protects precise parts, the shock resistance and the structural stability are improved, and the ignition efficiency and reliability are comprehensively improved.

The invention discloses an anti-dizziness magnetic field shielding device for human body magnetic resonance examination, and relates to the technical field of magnetic resonance examination. The head cover specifically comprises a cover body and a magnetic shielding layer, the cover body is of a cylindrical structure, a space used for containing the head is formed in the cylindrical structure, the magnetic shielding layer is arranged on the inner side face and / or the outer side face of the cylindrical structure, and the magnetic shielding layer is made of a magnetic field orientation material. The head of a patient is shielded through the magnetic shielding layer, the magnetic field effect on the patient when the patient passes through the scanner is reduced, the effect of the magnetic field on the patient is avoided, and therefore the effect of preventing the patient from dizziness is achieved.

The utility model provides a magnetic field fresh-keeping container and refrigeration equipment, and the magnetic field fresh-keeping container comprises a storage part which is provided with a storage space for storing stored objects; the magnetic field device comprises a first shell, a second shell and a magnetic field generating piece, a mounting cavity is defined by the first shell and the second shell, the magnetic field generating piece is arranged in the mounting cavity, and the magnetic field generating piece is used for generating a magnetic field in the storage space; and the fixing structure is used for fixing the magnetic field device on the storage part. The magnetic field device fixed to the storage part can generate a magnetic field in the storage space through the magnetic field generating part, so that food materials in the storage space are subjected to the magnetic field effect in the low-temperature storage process, the magnetic field fresh-keeping effect is achieved, and the fresh-keeping effect of the food materials is improved.

The present invention relates to a method, device, and medium for calculating AC loss in a superconducting cable. The method comprises obtaining superconducting cable operating data and structural parameters; calculating the horizontal and vertical components of the external magnetic field of each layer of strip at a constant critical current density using the operating data and structural parameters based on the Kim extended magnetic field effect; calculating the critical current density of the corresponding layer of strip and updating the zero-field region width parameter of the corresponding layer; obtaining the current density distribution; updating the vertical component of the strip's external magnetic field; and calculating the AC loss of the superconducting cable based on the updated zero-field region width parameter and the vertical component of the strip's external magnetic field. The device and medium are used to implement the above method. Compared with the prior art, the present invention simplifies the calculation of AC loss into a single item, making the calculation more accurate.