44 results about "Permalloy" patented technology

This invention discloses a non-embedded UAV information acquisition device and method. The non-embedded UAV information acquisition device includes a shell assembly, a three-mode adapter structure, a standardized physical interface, a main control module, a communication module, a positioning and sensing module, and a power management module. The internal cavity wall of the shell assembly is fitted with an anti-magnetic shielding layer made of permalloy. The three-mode adapter structure is integrated into the bottom of the shell assembly and includes a magnetic suction component, a suspension component, and a screw fixing interface. The standardized physical interface is located on the surface of the shell assembly and uses a gold-plated gold finger contact structure, which is electrically connected to the main control module. This invention enables deployment without disassembly of the UAV through a non-intrusive design while maintaining the UAV's airworthiness. It utilizes edge computing to alleviate cloud scheduling pressure and reduce task latency, and with independent power supply, achieves long endurance and high reliability, making it widely adaptable to various UAV models and harsh operating environments.

This invention discloses a method for fabricating a non-magnetic spatial reticulated shell structure composed of carbon fiber sheets. The load-bearing components of this reticulated shell structure are made of non-magnetic carbon fiber, while the connecting nodes are made of non-magnetic titanium alloy. A magnetic shielding layer is arranged in the roof system above the structural layer, creating a non-magnetic space with a magnetic field strength below 1 nT inside the reticulated shell. Specifically, the load-bearing components are made of carbon fiber sheets, fixed by two carbon fiber limb plates in an interlimb connection to form a hollow rectangular composite section. The connecting nodes consist of titanium alloy node plates, titanium alloy bolt groups, and carbon fiber limb plates. The magnetic shielding layer of the roof system consists of a shielding layer pad, a shielding layer, a shielding layer pressure plate, a buffer layer, a permalloy plate, and pressure strips. This invention features lightweight, high strength, and non-magnetic properties, creating a near-zero residual magnetism space through the roof magnetic shielding layer. It can be applied to various functional buildings with high magnetic field shielding requirements, as well as to general construction engineering.

The application discloses a kind of magnetic field shielding method and device of mechanical pump electron beam welding, based on the simulation analysis of the magnetic field distribution at the weld of mechanical pump, according to the shape of mechanical pump, iterative design magnetic field shielding device, adopt high permeability permalloy to make " two half splicing " type double shielding structure, the splicing seam of inside and outside two shielding layers is 90 ° angle, installed in the periphery of mechanical pump, in the premise of not changing the performance of mechanical pump itself, not transforming electron beam welding equipment realizes beam current no deflection in the process of mechanical pump electron beam welding, realizes the precision welding of mechanical pump.

The application relates to the technical field of magnetic materials, and particularly discloses a production process of a permalloy CT energy-taking magnetic core suitable for small-current starting, which comprises strip preparation, surface coating, spiral molding, hot pressing diffusion and gradient heat treatment. The application adopts a spiral sheet structure thin strip as a magnetic core raw material for the first time, combines a PVD coated metal plating layer of inner Mo and outer Cr, designs a Cr-Mo-Cr gradient coating and subsequent heat diffusion, forms an outer hard inner lead structure, and the structure has diffusion and progressive layers in height, solves the contradiction between the soft magnetic lead and high hardness of the existing magnetic core, realizes metallurgical bonding between strip layers through a hot pressing diffusion process, and the product has excellent mechanical strength and interlayer bonding force; through accurate alloy component design and gradient heat treatment, the product has ultrahigh magnetic performance and extremely low starting current: mu i > 60,000, H c < 0.73 A / m, starting current < 0.5 mA.

The invention discloses an active and passive combined zero magnetic device and a design method, and belongs to the field of magnetic shielding. The active and passive combined zero magnetic device comprises a passive shielding cabin composed of multiple layers of permalloy, and an equal-interval structure is arranged between every two adjacent layers; provided is a demagnetization system. The permalloy has high magnetic permeability, when a magnetic field encounters the permalloy with high magnetic permeability, magnetic field lines tend to spread along a path with higher magnetic permeability, namely walk along a permalloy layer instead of penetrating through a material, so that the environmental magnetic field is further reduced, a near-zero magnetic field environment is realized by designing a multi-layer permalloy cabin structure, and the performance of the magnetic field is improved. The demagnetizing coil is wound on the inner side wall and the outer side wall of the permalloy cabin body, and the demagnetizing coil is communicated with the external demagnetizing equipment through the demagnetizing interface at the end part of the demagnetizing coil, so that the amplitude of the demagnetizing current is gradually attenuated to the demagnetizing coil, and the permalloy cabin body is demagnetized; and the magnetization intensity of the material caused by the influence of the external environment and irresistible stress in the processing process can be weakened through the demagnetizing coil.

The utility model relates to the technical field of sensors, in particular to a miniature passive wireless sensor applied to temperature measurement of a high-speed motor rotor, which comprises a temperature sensing unit, a flexible connecting unit and a transmitting unit, and is characterized in that the temperature sensing unit comprises a surface acoustic wave resonator chip, a matching element and a temperature sensing end welding point; the transmitting unit comprises a spiral antenna unit, a fixed base and a transmitting end welding point. A first shielding layer, a second shielding layer and a third shielding layer are arranged, the first shielding layer and the second shielding layer which are good in conductivity are used for manufacturing a shielding cover and the like to surround an emission unit, a high-frequency magnetic field generates induction current on the surface of a metal shielding body, and a reverse magnetic field generated by the current can counteract part of an external magnetic field; and the first shielding layer is made of a permalloy plate, has high magnetic conductivity and can guide magnetic field lines to pass through the shielding layer, so that the magnetic field intensity of the space where the internal emission unit is located is greatly reduced.

The permalloy plate winding drum device comprises a base, the two ends of the top face of the base are fixedly connected with a pre-bending assembly and a shaping assembly respectively, and the pre-bending assembly and the shaping assembly are arranged oppositely; the shaping assembly comprises two first supporting legs, mounting cylinders are fixedly connected to the top surfaces of the two first supporting legs correspondingly, a plurality of sliding grooves are formed in the opposite side faces of the two mounting cylinders correspondingly, sliding plates are slidably connected into the two opposite sliding grooves, and the outer side faces of the sliding plates are of an arc-shaped structure; one end of the sliding plate is in transmission connection with a driving assembly which is arranged in an inner cavity of the mounting cylinder and fixedly connected with the base. The permalloy plate winding device is simple in structure, convenient to operate and good in winding effect, the diameter of a wound cylinder can be accurately adjusted, and the production and processing requirements of permalloy plates are met.

The utility model belongs to electric box shielding technical field especially is a kind of power distribution box shielding protection device of anti-electromagnetic interference, including electric box, the front end of electric box is hinged with cabinet door by hinge, the bottom of electric box is fixedly connected with reinforcing seat, the sidewall of electric box is equipped with several ventilating grooves, the sidewall of electric box is equipped with several air flue, and heat dissipation fan is fixedly installed on the inner wall of electric box on air flue, the inner sidewall of electric box is fixedly connected with bracket.The utility model, electric box is composed of permalloy, plated copper honeycomb, aluminium sheet layer, inner wall is coated with epoxy resin paint, cabinet door is sealed with mechanical lock, bottom has "mouth" type reinforcing seat support, sidewall is equipped with ventilating groove, air flue and six different wind direction heat dissipation fan heat dissipation, rear sidewall incoming and outgoing line hole has gravity closure round cover, can prevent electromagnetic interference in full frequency band, give consideration to heat dissipation, dustproof and waterproof, structure is stable, and it is convenient to install maintenance.

The utility model discloses a broadband track double-body mutual inductor. The broadband track double-body mutual inductor comprises a first current transformer and a second current transformer, according to the utility model, the first current transformer and the second current transformer are arranged to be of an integrated structure and are in a double-ring 8 shape, so that the current of two paths of moving tracks can be measured at the same time, the overall size is reduced, the problem of small installation space is solved, the installation is simple and convenient, and the monitoring cost is reduced; and an annular magnetic core in the current transformer is a permalloy magnetic core and has a high-frequency characteristic, so that broadband measurement is realized, and the power of the mobile locomotive in the running process is monitored.

There is provided a performance testing and evaluation method for a permalloy material for construction of a magnetically-shielded room and relates to testing and evaluation on alloy shielding performance. The present disclosure aims to solve the problem of failure to satisfy the requirements of different application scenarios for the magnetic field shielding due to lack of in-depth research on the shielding effect of the current permalloy in the magnetically-shielded rooms. The method includes: at step 1, selecting a permalloy sample, and conducting quality inspection on the sample to ensure the sample is compliance with an experiment requirement; at step 2, setting up an experimental apparatus; where the permalloy sample is vertically placed, and a magnetic field generation coil and a magnetic field measuring sensor are respectively placed at left and right sides of the permalloy sample; at step 3, carrying out shielding performance testing and evaluation on the permalloy sample.

The invention discloses a variable range magnetic sensor based on a magnetic shielding effect and application, the variable range magnetic sensor comprises a magnetic shielding sleeve, a printed circuit board and a magnetoresistance sensing chip, the magnetic shielding sleeve is embedded in the printed circuit board, and the magnetoresistance sensing chip is arranged on the printed circuit board and located in the magnetic shielding sleeve. A single-layer double-opening permalloy magnetic shielding sleeve is nested on a PCB (Printed Circuit Board), and a magnetoresistance sensing chip is arranged in the magnetic shielding sleeve. The structure is designed to be used for increasing the measuring range of the magnetoresistance sensing chip, and dynamic adjustment of the measuring range of the sensor is achieved by adjusting the position and the thickness of the magnetic shielding sleeve. The sensor described by the invention can be better applied to a scene with a wide dynamic magnetic field range, and has better nonlinearity and anti-interference capability.

The utility model discloses an electromagnetic shielding type capacitor, and particularly relates to the technical field of capacitors, the electromagnetic shielding type capacitor comprises a main body mechanism and a connecting assembly, the outer diameter surface of the main body mechanism is provided with the connecting assembly, and the main body mechanism comprises a shielding assembly, a capacitor assembly and a cover plate assembly. The electromagnetic shielding type capacitor comprises a capacitor assembly, a shielding assembly is placed on the outer diameter surface of the capacitor assembly, a cover plate assembly is installed on the side face of the shielding assembly, an electromagnetic shielding layer is additionally arranged on the electromagnetic shielding type capacitor through the shielding assembly, and a metal shell of the capacitor is made of permalloy with the electromagnetic shielding performance. External electromagnetic interference can be effectively prevented from entering the capacitor, electromagnetic radiation generated by the capacitor is limited to a certain degree, and interference to other surrounding electronic elements and circuits is reduced.

The invention discloses a preparation method for improving the initial permeability of permalloy, which is based on Fe-Ni-Mo permalloy and adopts a ternary synergistic process of electron beam smelting, ultra-large cold rolling deformation and magnetic field heat treatment. The permalloy strip with the ultrahigh initial permeability is prepared through the method, three microscopic barriers including an impurity pinning barrier, a grain boundary and defect barrier and an intrinsic magnetic barrier which limit the magnetic performance of permalloy are overcome, the permalloy strip with the ultrahigh initial permeability is obtained, and the method has the advantages of being simple in process, low in cost, easy to produce in batches and the like, and can well meet the requirements of high-end electromagnetic elements.

The invention relates to the technical field of silicone oil water pump production and welding, and particularly discloses a magnetism-isolating silicone oil water pump and a welding device thereof.The magnetism-isolating silicone oil water pump comprises a pump body, the pump body is made of aluminum alloy, a magnetism-isolating shell is further arranged in the pump body, a magnetism-isolating groove is formed in the magnetism-isolating shell, and a magnetism-isolating ring made of permalloy is arranged in the magnetism-isolating groove; and nickel foil transition layers are arranged on the inner and outer peripheral walls of the magnetic isolation groove. The welding device of the magnetism isolating silicon oil water pump comprises a machine body, two welding guns and a rotary lifting table arranged on the machine body, the two welding guns correspond to the inner side and the outer side of a magnetism isolating ring respectively, a clamping tool is detachably arranged on the rotary lifting table, and a first electromagnet opposite to the magnetism isolating ring is arranged on the machine body and located above the clamping tool. The machine body is provided with a cooling mechanism used for cooling the magnetism isolating ring and a detection assembly used for detecting the magnetic permeability of the magnetism isolating ring. The magnetic isolation ring has the effects of reducing the welding difficulty and improving the guiding magnetic circuit of the magnetic isolation ring.

The invention discloses a high-power switching power supply device applied to a static magnetic field. The device adopts a four-stage protection system, wherein the first stage is a double-nested structure shell formed by attaching a pure iron plate and permalloy through conductive silicone grease, and overall efficient magnetic shielding is achieved; the second stage is a local reinforced shielding chamber which is internally made of a pure iron plate and is used for carrying out secondary isolation on the control and power module; the third stage adopts at least two LLC power modules which are connected in parallel and are symmetrically arranged, and the static magnetic field influence is inhibited from the source through magnetic field offset; and the fourth stage carries out fine management on the opening and the gap through a magnetic shielding waveguide tube and a magnetic conductive sealing strip. The control system adopts an optical fiber and a shunt for sampling, and CAN communication and current sharing control are combined, so that the signal accuracy and the system stability are ensured. The problems of loss increase, control instability and the like caused by magnetic saturation of a high-power switching power supply in a static magnetic field environment are solved, and high-reliability and high-power direct-current conversion output in a strong static magnetic field environment is realized.

The utility model discloses a signal monitoring device for the steering angle of a forklift, belonging to the field of sensors and measurement technology. Aiming at the problem that the angle detection device in the prior art is vulnerable to external interference, the signal monitoring device for the steering angle of a forklift of the utility model uses the U-shaped permalloy structure of the magnetic isolation cover to shield the non-working side of the magnetic pole array, only exposing the bottom magnetic field, completely isolating interference and doubling the effective magnetic flux density; multiple pairs of NS alternating magnets are arranged in a ring and the pole pitch matches the width of the Hall sensor, realizing sensitive capture of micro-steering of ±1°. The linkage design of the insertion block and the slot is combined with the rotary support of the circular groove at the bottom of the turntable to eliminate wear and accurately transmit torque; the double O-ring IP67 seal and the base shock-absorbing layer cooperate to resist oil, moisture and impact. As a whole, it provides a highly reliable and maintenance-free signal source for forklift steering control.

The magnetic shielding device based on the low magnetic noise and high shielding performance of the permalloy-ferrite-superconducting coil can provide a stable extremely low magnetic noise weak magnetic environment for an ultra-high sensitive SERF magnetic field and inertial measurement device, mainly composed of a permalloy magnetic shield, a ferrite magnetic shield, a superconducting coil magnetic shield support, a non-metallic dewar, a superconducting coil winding disc and an adjustable stud, etc., the ferrite magnetic shield is placed in the permalloy magnetic shield cavity, the superconducting coil magnetic shield support is placed in the ferrite cavity, the non-metallic dewar is placed on the superconducting coil magnetic shield support, and the superconducting coil winding disc is placed in the non-metallic dewar cavity, by combining the active magnetic shielding of the superconducting coil with the traditional passive magnetic shielding of the permalloy-ferrite, the problem that the magnetic noise of the traditional magnetic shielding material is difficult to further reduce is overcome, and the magnetic noise of the device is further reduced, and the sensitivity of the SERF magnetic field and inertial measurement device limited by the magnetic noise of the magnetic shielding itself can be greatly improved.

The invention relates to the technical field of current transformers, in particular to a wide-range current transformer. The transformer comprises an iron core, a winding, a multi-layer electromagnetic shielding layer and a shell, the winding is wound on the iron core, the multi-layer electromagnetic shielding layer is arranged around the iron core and the winding, and all the parts are fixedly installed in the shell. The iron core is made of customized ultracrystalline alloy through winding, transverse magnetic treatment and vacuum annealing, the machining error is controlled within + / -5 microns, the magnetic performance is excellent, and the high-temperature stability is high; the winding is made of high-purity oxygen-free copper enameled wires and is wound in a layered, segmented and nanoscale precision mode, and polyimide films are arranged between layers for insulation. The multiple electromagnetic shielding layers are of a composite structure of permalloy on the inner layer and copper on the outer layer, and full-band interference resistance is achieved through collaborative optimization. According to the invention, high-precision measurement is realized in a rated current range of 10%-200%, and the device is suitable for electric energy metering, new energy power generation and other scenes, and has the characteristics of accurate measurement, good stability, strong interference resistance and excellent dynamic response.

The invention discloses an anti-interference stable partial discharge sensor. The anti-interference stable partial discharge sensor comprises a rear shell, the front cover is mounted on the front surface of the rear shell; a shielding assembly is arranged in the front cover and comprises a conductive layer, a permalloy middle layer and a copper lining layer which are sequentially arranged in a sleeved mode from outside to inside, in the using process, a high-frequency electromagnetic field is shielded through the conductive layer, the permalloy middle layer is made of a high-permeability magnetic material and can shield a low-frequency magnetic field, the copper lining layer further absorbs residual electromagnetic waves, and the shielding effect is good. The three are separated through the first particle mixing layer, so that eddy current interference caused by an electric continuum formed by direct contact is avoided, and vibration attenuation is realized at the same time; the three shielding layers are arranged in the sensor shell, the two independent cavities are formed and filled with the heavy metal damping particles and the soft magnetic absorption particles respectively, a cooperative anti-interference system is constructed, the heavy metal particles in the inner cavity are mixed with the viscous medium, and mechanical vibration energy can be efficiently absorbed through inertia friction.

The invention discloses a cable tunnel inspection unmanned aerial vehicle system which comprises a layered anti-electromagnetic interference machine body structure which sequentially comprises a carbon fiber composite material layer, a permalloy magnetic shielding layer and a copper-plated electronic cabin from outside to inside. Wherein the outer layer is used for shielding high-frequency electromagnetic interference; the middle layer is used for inhibiting a low-frequency power-frequency magnetic field; and the inner layer forms a Faraday cage structure for isolating residual radiation noise. The invention further discloses a control method which comprises the steps that the dynamic pressure difference and the attitude angular velocity are obtained; inputting the wind speed into the constructed LSTM neural network model, outputting a wind speed change trend in a future period, and calculating an optimal motor rotating speed adjustment amount in combination with a pre-calibrated nonlinear motor tension curve; and dynamically adjusting the deflection angle of the control surface according to the attitude angle error of the gyroscope by adopting a self-adaptive PID algorithm. According to the invention, the flight stability and control precision of the unmanned aerial vehicle in a strong disturbance environment are significantly improved.

This utility model discloses a magnetic marking machine, relating to the field of magnetic marking technology. It includes a frame, a marking head, a control system, and a flexible electromagnetic chuck device mounted on the frame's worktable. The flexible electromagnetic chuck device consists of four layers: an array of permeable micropores on the surface of the flexible silicone chuck layer, which utilizes the downward pressure of the marking head to trigger self-generated negative pressure adsorption; an electromagnet array embedded in the bottom of the silicone layer, employing honeycomb-shaped independent units to achieve precise local excitation; a magnetically reinforcing layer made of high-permeability permalloy, integrating discrete magnetic fields to enhance magnetic attraction; and a buffer air cavity layer connected to a negative pressure air source, suppressing vibration displacement through pre-compressed elastic support columns. This solution solves the problem of adsorption and positioning of irregularly shaped magnets, achieving adaptive zero-energy adsorption and vibration-resistant control on curved surfaces.

The utility model relates to an electromagnetic type and suspension type composite earphone diaphragm, which comprises a diaphragm main body, two magnetic conductive rings and an elastic folding ring, the two magnetic conductive rings are designed in an annular structure, the two magnetic conductive rings are respectively clamped on the edges of the upper surface and the lower surface of the vibrating diaphragm main body, the elastic folding ring is designed in an annular structure, the elastic folding ring is arranged on the outer side of the vibrating diaphragm main body, and the inner side edge of the elastic folding ring is connected with the upper surface of the magnetic conductive ring above the vibrating diaphragm main body in an attached manner. In addition, the utility model also provides an earphone structure with the composite earphone diaphragm with the electromagnetic and suspension design. According to the utility model, the composite diaphragm based on electromagnetic driving is designed, and the permalloy diaphragm and the optimized suspension design are combined, so that high-fidelity sound playback of the earphone in a broadband range can be realized, and the earphone has the characteristics of high sensitivity and low distortion; the utility model has the advantages of strong practicability and strong popularization significance.

The application discloses a kind of well far detection high-sensitivity low-noise magnetic sensor, belong to geophysical exploration technical field.Sensor includes magnetic core and coil assembly, pre-differential amplification module, magnetic flux negative feedback module, temperature compensation module, power supply and filtering module and titanium alloy packaging shell.Magnetic core is permalloy laminated hollow structure, coil assembly includes tightly coupled inductive coil and feedback coil;Pre-amplification module adopts the full differential structure of JFET parallel, realizes low-noise amplification;Magnetic flux negative feedback module expands working frequency band;Temperature compensation module stabilizes sensitivity and operating point;Power supply and filtering module reduce noise interference;Packaging shell realizes electromagnetic shielding, anticorrosion and anti-vibration protection.The application solves the problem of insufficient sensitivity, poor anti-interference and weak adaptability of existing sensor, can effectively capture far-field weak magnetic signal, and is suitable for resource exploration in complex underground environment.

The fasteners for chain-type accessories can be easily removed when needed, and the magnetic force is not transmitted to the surrounding area on the magnetic surface where it is not originally needed. This prevents magnetic clasps from attracting each other when multiple chain-type accessories are displayed side by side on display shelves, etc., and also prevents magnetic clasps from attracting to bag fittings when a hand is placed in a bag. [Solution] A fastener for a chain-like accessory is provided with a pair of magnets 2 at the fasteners at both ends of the chain 3 of the chain-like accessory, and the surfaces other than the joining surface 2a of the magnets are surrounded by a magnetic shielding material 4. The magnetic shielding material is made of iron, permalloy, sendust, or silicon copper, and a gap 5 is interposed between the magnet and the magnetic shielding material.

This invention discloses a method for preparing high-frequency, low-loss Fe-Ni-Mo permalloy powder using an atomization and heat treatment process, relating to the field of soft magnetic functional materials technology. The invention includes the following steps: first, electrolytic iron, electrolytic nickel, molybdenum plate, ferroboron, silicon, and sponge yttrium are smelted to obtain an alloy liquid; then, the alloy liquid is atomized and solidified to form powder; the resulting atomized powder is cleaned and treated in an argon atmosphere at 600-620℃ for 30-40 minutes; subsequently, it is coated with Y-Al-F-O sol, followed by silica coating; finally, it is treated in an argon atmosphere at 380℃ for 30-40 minutes, and after sieving, high-frequency, low-loss Fe-Ni-Mo permalloy powder is obtained. This preparation method effectively improves the insulation resistance, high-frequency low-loss capability, and frequency stability of the permeability of the Fe-Ni-Mo permalloy powder.

This invention provides a wearable occupational health data monitoring device for power grid workers. It includes an adaptive constant-pressure fitting mechanism for driving the strap to expand in low-temperature environments, ensuring constant pressure contact between the sensor module on the back of the watch and the wearer's wrist; and an inertial-triggered joint locking mechanism for converting the flexible joint between the flexible watch head and the strap into a rigid connection upon detecting an impact. This invention provides an adaptive intelligent monitoring device for high-altitude, low-temperature, strong magnetic field, and high-impact working environments. Utilizing a bidirectional shape memory actuator and a temperature control valve, the strap automatically expands at low temperatures, eliminating wearing gaps and ensuring accurate and continuous monitoring of physiological signals; rapid locking via a MEMS accelerometer and magnetorheological fluid joint suppresses vibration and improves monitoring stability; and a permalloy alloy and coating are used to construct an anti-magnetic structure to resist interference from strong power frequency magnetic fields. The device significantly improves adaptability, reliability, and wearing comfort under extreme working conditions.

The invention belongs to the technical field of semiconductor manufacturing, and particularly relates to an integrated circuit packaging wire bonder pressing plate structure which comprises a base, the lower side wall of the base is connected with a pressing plate, the lower side wall of the pressing plate is provided with an annular groove, an annular rubber ring is fixed in the annular groove, magnetorheological fluid is distributed in the annular rubber ring, and the magnetorheological fluid is connected with the pressing plate. The pressing plate is filled with an annular coil located on the upper side of the annular rubber ring. Intelligent pressure application is achieved through the magnetorheological fluid dynamic pressing system, the liquid magnetorheological fluid keeps the rubber ring soft in a normal state, and the surface of the chip is prevented from being damaged; after electrification, the magnetic field enables the magnetorheological fluid to be solidified instantly, uniform and adjustable pressure is applied to the edge of the chip in combination with the magnetic field efficiency enhanced by the permalloy plate, the problem of displacement or damage caused by pressure concentration of a traditional pressing plate is thoroughly solved, and meanwhile, the diamond copper pressing plate and the multi-channel cooling system are adopted for cooperative heat dissipation. Ethylene glycol cooling liquid efficiently flows and absorbs heat in the bevel heat conduction cavity and is shunted to the cooling pipe through the distribution plate, so that efficient cooling is realized.

The utility model discloses a high-precision parallel-plate capacitive sensor structure, which belongs to the field of parallel-plate capacitive sensors and comprises a bottom plate, a sensor assembly is arranged on the bottom plate and consists of an upper polar plate and a lower polar plate, the upper polar plate and the lower polar plate are fixedly mounted on two insulating support columns respectively, and a distance adjusting mechanism is mounted on the bottom plate. The bottom plate is further provided with a shielding mechanism, the shielding mechanism comprises a permalloy shielding cover, a copper net is fixed in the permalloy shielding cover, a rectangular groove is formed in the top of the bottom plate, and the permalloy shielding cover and the copper net are installed in the rectangular groove in an embedded mode. According to the utility model, through the arrangement of the shielding mechanism, the effect of efficiently shielding various electromagnetic interferences is achieved, a double-layer structure formed by the permalloy shielding cover and the internal copper net can shield a low-frequency magnetic field and high-frequency electromagnetic radiation respectively, and permalloy has a good magnetic conduction shielding effect on the low-frequency magnetic field.

The application provides a magnetic field device for cell culture and a design method of a magnetic field coil thereof, a magnetic shielding box made of two layers of permalloy can effectively avoid the influence of a 50uT level geomagnetic field and an external interference magnetic field, a pair of three-direction double-plane magnetic field coils are arranged in the magnetic shielding box in an up-down mode, each three-direction double-plane magnetic field coil comprises three double-plane coils, the three double-plane coils are used for providing magnetic fields in three directions along three coordinate axes, the magnetic field strength in the three directions is less than 20nT, and the frequency, waveform and strength are all different; the application can be beneficial to cell culture, and can provide an experimental condition of an applied excitation magnetic field with different frequencies, waveforms and strengths, and the application will not be affected by the geomagnetic field and the interference magnetic field.

According to this disclosure, a means may be provided for an electromagnetic wave shielding laminate film that is less prone to breakage when bonded to an object having a bent portion, and that achieves a high electromagnetic wave shielding effect when the object has a bent portion. [Solution] This disclosure relates to an electromagnetic wave shielding laminate film comprising a resin layer and a conductive layer, wherein the resin layer contains at least one compound selected from the group consisting of elastomers and cellulosic polymers and a magnetic material, the conductive layer contains a conductor, and the magnetic material comprises at least one selected from the group consisting of permalloy, ferrite and sendust, and the elongation at break at 170°C is 110% or more and 200% or less.