263results about How to "Play the role of insulation" patented technology

The invention discloses a wafer-level integrated encapsulation method of MEMS (Micro Electric Mechanical System) devices requiring different atmosphere pressures. The method comprises the following steps of: 1. preparing at least two MEMS devices requiring different quality factors on a silicon wafer; 2. preparing a glass micro-cavity for sealing an MEMS chip corresponding to the positions of the MEMS devices on a glass wafer with a thermoforming method, and depositing a getter in the glass micro-cavity in which the MEMS chip is encapsulated to obtain a functionalized glass wafer; 3. carrying out anodic bonding on the functionalized glass wafer and the silicon wafer with the MEMS devices so as to hermetically encapsulating the MEMS devices; and 4. selectively heating the getter in the glass micro-cavity in which the MEMS chip is encapsulated by laser to absorb air so that the quality factor in the cavity is changed. In the method, the getter is arranged in each cavity, and the quality factor in the encapsulation cavity is changed selectively by heating and activating.

The invention discloses a method for packaging a wafer level glass micro-cavity of a light-emitting diode (LED), and the method comprises the following steps: (1) etching a micro-slot array corresponding to the pattern of a packaged LED array on a silicon wafer, wherein the micro-slots are communicated through a micro-channel, and a proper amount of heat gas releasing agent is arranged inside the micro-slots; (2) forming a closed cavity; (3) heating the bonded wafer in the air to form a spherical glass micro-cavity and a cylindrical glass micro-channel connected with the spherical glass micro-cavity, cooling to room temperature, annealing, and removing silicon to obtain a wafer level glass micro-cavity; (4) sputtering a metal layer on the silicon wafer, and preparing a metal lead through photolithography, so as to obtain a lead substrate, wherein the position of the metal lead corresponds to the position of the micro-channel of the glass micro-cavity; (5) mounting an LED chip on the lead substrate, and leading; (6) bonding the wafer level glass micro-cavity with the substrate to form a bonded wafer; and (7) filling the gap between the LED chip and the wafer level glass micro-cavity with silicone through the glass micro-channel. According to the invention, the light emitting efficiency is high, and a packaged glass lens realizes beam collimation.

The invention relates to nutritive absorbent resin seedling raising paper and a preparation method thereof. The preparation method comprises: performing modification and ultrasonic treatment of corn stalks; adding aqueous solution of K2S2O8 into the corn stalks to prepare gel; soaking the gel in mixed nutrition solution to obtain a nutritive absorbent resin; uniformly spraying the nutritive absorbent resin onto paper; and covering the paper with a layer of cotton pulp soft paper and drying the soft paper to obtain the nutritive absorbent resin seedling raising paper. The invention is characterized in that: the seedling raising paper using the nutritive absorbent resin which is made from crop stalks as a main body can reduce soil consumption for raising seedlings, improve seedling raising temperature and reduce workload in a seedling raising process; complex process procedures for raising seedlings by soil and fertilizer are reduced; when the seedling raising paper is used, strong seedlings with thick and strong roots can be obtained; when the seedling raising paper is used in a seedling raising process of rice, tobacco or other plants, nutrients the seedlings need can be supplied continuously with high efficiency; and the use of the paper is convenient, the seedling raising process is simplified, the seedlings are suitable to be planted by machines or hands, the working efficiency of the planting is high and the planting quality is high.

The invention relates to a hair-washing and massaging robot comprising a massaging hand, a connection base, a connecting rod and a control device, wherein one end of the connecting rod is fixedly connected with the massaging hand, and the other end of the connecting rod is fixed on the connection base. An intelligent control system is connected with an alarm, a display screen and a general packet radio service (GPRS) wireless communication module. When hands are not convenient to use, the robot can automatically wash hair, massage the head, facilitate life and achieve high automation control. The vibration of a finger-shaped structure can achieve the massaging function, and rubber fingers do not damage the scalp of people and have an insulating function. An infrared sensor can perform a function of a switch. When the infrared sensor does not detect an obstacle, a sprayer does not response and water is saved. By means of the intelligent control system, automatic warning can be achieved, a water inlet pipe can be controlled, and flow of shampoo can be controlled. By means of the GPRS wireless communication module, nursing staff can carry out remote monitoring and handle dangers at any time once the dangers happen.

The invention discloses a high-efficiency shockproof low-voltage cabinet. The high-efficiency shockproof low-voltage cabinet comprises a cabinet body, a connection plate, an adjustment lead screw anda base, wherein the base comprises a first bottom plate, a second bottom plate is arranged right above the first bottom plate, two ends of the second bottom plate vertically face upward, wheel shaftsare fixedly arranged at positions, near to one side of the second bottom plate, of two ends of the first bottom plate, and a roller is movably connected with one end, far away from the first bottom plate, of each wheel shaft. By matching of a first installation frame, a second installation frame, a first magnetic block, a second magnetic block, a support rod, a support plate and a telescopic spring, the vibration generated by a power cabinet during running can be greatly reduced, a shockproof effect is good, stable running of the power cabinet is favorably maintained, the integral service lifetime of the power cabinet is prolonged, heat is absorbed by cooling fins, blades are driven to rotate so as to rapidly cool the cooling fins by a fan, and heat dissipation in the cabinet is further accelerated.

The invention discloses a flexible panel, a method for manufacturing the flexible panel and a flexile display device. Due to the fact that a buffer layer is insulating and high in thermal conductivity, the insulating function is realized on one hand, and on the other hand, when laser crystallization is conducted on an amorphous silicon membrane on the buffer layer to form a polycrystalline silicon membrane, residual laser energy can still be dissipated quickly through the buffer layer high in thermal conductivity even if laser energy can not be absorbed totally by the amorphous silicon membrane. In this way, damage to a flexible substrate by the residual laser energy is avoided, and the performance of the flexible panel is guaranteed.

The invention belongs to the field of a metal-based soft magnetic composite material. A preparation method comprises the following steps of preparing amorphous alloy powder from an amorphous alloy thin strip; screening and compounding the amorphous alloy powder to obtain a first product; performing passivation and coupling processing on the first product to obtain a second product; mixing and stirring the second product and a ceramic precursor polymer solution to obtain composite amorphous powder; and performing formation, thermal processing and insulation layer coating on the composite amorphous powder to obtain amorphous soft magnetic composite magnetic powder. By adopting a ceramic precursor polymer as an insulation binding agent, the step of adding insulation agent powder is omitted, the problems of unstable magnetic conductivity and poor thermal stability during traditional preparation of the magnetic powder core by crashing the amorphous thin strip are solved, the production cost is reduced, and the amorphous soft magnetic composite magnetic powder can be applied to a certain electronic device with application requirements for high frequency and low loss.

The invention relates to a coaxial in-arc wire feeding and out-arc powder feeding TIG electric arc additive manufacturing device. The device comprises a SiO2 glass tube, four powder feeding spray nozzles, a tungsten electrode red copper cooling body, a half-cracking hollow tungsten electrode and four powder feeding channels. Four types of alloy powder with different components can be supplied at most through the four powder feeding channels and the powder feeding quantity of each powder feeding channel is adjustable, and additive manufacturing of a functional gradient structure material part is achieved easily, so that material, structure and service performance of the additive manufacturing part are matched optimally.

The invention discloses a cable connecting clamp with an insulating sheath. The cable connecting clamp comprises two parallel fixedly connected cable clamps used for clamping cables, the cable clamps comprises cable clamp bodies, grooves are arranged in the cable clamp bodies, movable clamps are embedded in the grooves, a fixed clamp is fixed on the cable clamp bodies, adjusting bolts respectively penetrate bolt holes on the lower portions of the cable clamp bodies to be fixed with the cable clamp bodies and abutted against the movable clamps, an upper insulating shell is shaped on the fixed clamps, a lower insulating shell is correspondingly formed in a cable clamping cavity between the cable clamping bodies and the fixed clamp, the lower insulating shell is fixedly connected with the upper insulating shell, and cable passing portions of the lower insulating shell and the upper insulating shell form a circular cavity. The cable connecting clamp with the insulating sheath has the advantages of strong universality, applicability to various cables in different diameters, uniform and constant clamping force, small universality, insulation, water resistance and safety in utilization.

The invention relates to an improvement on a reversing sheet and a reverser manufactured by the reversing sheet and further relates to an improvement on the manufacturing process of the reverser. The reversing sheet comprises a main body and a root part, and is characterized in that bulges are transversely arranged on the left side and the right side of the main body; the reverser manufactured by the reversing sheet comprises mould plastic and the reversing sheets; the reversing sheets are embedded into the mould plastic and are arranged into a circle; the reverser manufactured by the reversing sheet is characterized in that the bulges on one side of each of the adjacent reversing sheets are adhered to one another; the mould plastic stretches between the reversing sheets and the main bodies; a space formed by the bulges between the two main bodies is filled with bakelite powder (namely mould plastic). The bakelite powder replaces conventional mica sheets to achieve an insulating effect, so that the labor is saved, the production efficiency is improved and the production cost is reduced; and the manufacturing process of the reverser is simpler.

The invention relates to an UHMW-PE (ultrahigh molecular weight polyethylene) pipe, in particular to a multifunctional polyethylene and stainless steel composite pipe formed by compositing the UHMW-PE pipe and stainless steel, and a preparation method of the composite pipe. The UHMW-PE pipe comprises the following components in parts by weight: 100 parts of UHMW-PE, 10-15 parts of diatomite, 8-10 parts of short glass fiber, 7-10 parts of calcium bicarbonate, 7-10 parts of organic tin, 1-5 parts of nano aluminum nitride, 1-2 parts of graphite, 0.1-1.5 parts of PE wax, 2-5 parts of acrylic ester, 3-5 parts of silicone polymer, 3-6 parts of titanium dioxide, 6-10 parts of shock-resistance MBS (methyl methacrylate-butadiene-styrene copolymer) resin, 0.5-1.0 parts of antioxygen 1010, and 3-5 parts of light absorption agent FeMnOx composite oxide. The composite pipe comprises an UHMW-PE inner pipe and a stainless steel outer pipe between which hot glue adhesion layer is adhered, wherein a SiO2 composite coating is coated on the outer surface of the stainless steel pipe. The multifunctional polyethylene and stainless steel composite pipe disclosed by the invention has the advantages of convenience in installation, good performance and wide application.

The invention relates to a carbon nanofiber heating cloth which includes an insulating fiber woven belt formed through warp and weft weaving of insulating fibers. Carbon fibers which are arrayed in parallel are interspersed in the warp or weft direction of the insulating fiber woven belt. The two ends of the carbon fibers are connected with electrodes. The carbon fibers are formed by carbon nanofibers. The carbon nanofibers have the characteristics of low density, high specific modulus, high strength, high conductivity, excellent thermal stability and large specific surface area and the like. Therefore, the carbon nanofiber heating cloth made of the carbon nanofibers has an excellent heating effect and the surface of the whole heating cloth is uniform in heating temperature and the tensile strength, bending resistance and compression resistance performance are excellent so that the heating cloth is reliable in quality and longer in service life and at the same time, the heating efficiency is also improved and the heating cloth also plays an excellent energy-saving and environment-protecting role.

The invention discloses a screw sliding plunger type step temperature control melting electrostatic spinning device. The device comprises a melting heating unit, a screw transmission unit, a step temperature control unit and an electrostatic spinning unit, and is characterized in that the screw transmission unit applies pressure to the melting heating unit to extrude molten materials from a discharge port nozzle, the molten materials form spun fibers under the action of electric field force, the spun fibers are further stretched by the step temperature control unit, and are finally captured bya collecting rotation disc of the electrostatic spinning unit, and electrostatic spinning is completed. The electrostatic spinning device can realize step temperature control to obtain finer electrospun fibers, and has better application prospect in the field of melting electrostatic spinning.

The invention belongs to the technical field of a cable and particularly relates to a high-strength impact-resistant flame-retardant insulation cable. The high-strength impact-resistant flame-retardant insulation cable includes a cable core and a cable base, wherein the cable core is externally wrapped in the cable base, an outer surface of the cable base is sleeved with a shape memory alloy layer, a surface of the shape memory alloy layer is sleeved with a glass fiber layer, an outer surface of the glass fiber layer is sleeved with an elastic base, the elastic base is internally provided with a chamber, the chamber is internally disposed with extinguishing chemical, and the fire extinguishing flame retardation effect is achieved for a fire through the extinguishing chemical in the chamber. After the shape memory alloy layer on the outer surface of the cable base expands, deformation wrapping for the cable base is generated, so strength and anti-impact performance of the cable base are improved, when internal thermal deformation of the cable base is prevented, softening of the cable base is generated, so strength and stiffness of the cable base are influenced, the glass fiber layer not only has the fire retardant effect, but also has the insulation effect.

The invention relates to a fireproof anticorrosion cable tray and a processing technology thereof, and belongs to the technical field of distribution equipment. The fireproof anticorrosion cable traycomprises a box, a box cover, an extinguishing device and a heat radiation device, the upper and lower surfaces of the box cover are provided with first and second smoke sensors respectively, and theheat radiation device is arranged in the sidewall of the box; the fire extinguishing device comprises a carbon dioxide gas cylinder, an internal nozzle and external nozzles, the internal nozzle is arranged in the inner sidewall of the box, the external nozzles are arranged over the box cover, and a carbon dioxide gas cylinder is communicated with the internal and external nozzles via a pipeline; and the heat radiation device comprise a silica gel heat conducting sheet, a first heat conducting plate and a second heat conducting plate, and one side surface of the second heating conducting plateis provided with metal radiating fin. Due to cooperation among the first smoke sensor, the second smoke sensor and the extinguishing device, the fireproof anticorrosion cable tray can extinguish fireactively, and the fireproof anticorrosion cable tray is much safer.

The invention provides a cylindrical Langmuir probe, a probe assembly and a plume flow field detection system, and relates to the technical field of plasma detection. The cylindrical Langmuir probe comprises a tungsten rod needle body, a sheath cylinder and a hollow locking rod; the sheath cylinder and the hollow locking rod are both made from insulated materials; a needle body connecting column is arranged at one end of the tungsten rod needle body; the tungsten rod needle body penetrates out of a first end of the sheath cylinder, and the sheath cylinder is internally provided with a needle body locating cavity which cooperates with the needle body connecting column; a cable through hole for a cable to penetrate through is formed in the hollow locking rod; the hollow locking rod is inserted into a second end of the sheath cylinder, and can push the needle body connecting column to abut against the end face of the needle body locating cavity; the hollow locking rod is locked with the sheath cylinder. By means of the cylindrical Langmuir probe, the technical problems in the prior art that a measuring result of a Langmuir probe is easily interfered with, and the measuring precision is low are solved.

The present invention provides an arc extinguishing chamber contact spring assembly for a 12kV high-voltage ring main unit, which successively comprises the components of: a rod end joint bearing, a contact spring seat, a contact spring seat connecting block, the other contact spring seat, an insulating pull bar, and an insulating pull bar insert. One end of the rod end joint bearing and one end of the contact spring seat connecting block are respectively connected with two sides of the contact spring seat. The other end of the contact spring seat connecting block successively penetrates through the other contact spring seat and a fastening lock and then is inserted into one end of the insulating pull bar. One end of the insulating pull bar insert is connected with the other end of the insulating pull rod. The contact spring seat is also provided with a shaft shoulder. A contact spring is sleeved between the shaft shoulder of the contact spring seat and the locking nut. The arc extinguishing chamber contact spring assembly of the invention has the advantages of: simple mounting, flexible adjustment, low manufacturing cost and high assembling consistency. Particularly the arc extinguishing chamber contact spring assembly has a small size and is particularly suitable to be used in a miniature circuit breaker solid-insulation-embedded pole.

The invention relates to an overhead line phase sequence plate hot-line assembly and disassembly method and an assembling device, and belongs to the technical field of power supply maintenance and construction. According to the technical scheme, the assembling device comprises side baffles (1), a main substrate (2) and a connector (3), the main substrate is a square insulating board, the side baffles are arranged on three edges of the obverse side of the main substrate and are integrally of a U type, each U-type side baffle is open upwards, the side baffles are also insulating boards and are bonded to the main substrate through vertical boards (4), a gap is reserved between each side baffle and the main substrate, the thickness of each gap is equal to the height of the corresponding vertical board, a slot (5) is formed by the side baffles, the main substrate and the vertical boards, and the connector is arranged on the reverse side of the main substrate. The assembling device is simple in structure, flexible in use and capable of conveniently assembling or disassembling phase sequence plates, the problem that operating personnel need to ascend is solved, labor intensity is relieved, the insulating effect is achieved, safety is guaranteed, the line outage frequency is reduced, and the power supply reliability rate is guaranteed.

The invention discloses a friction-type stud shearing-force connection part and a construction method thereof. The friction-type stud shearing-force connection part includes a stud shearing-force connection part main body, a mounting nut, a sleeve, a fixing nut and a semiconductor spring; the stud shearing-force connection part main body comprises a thread section, a thread-free extrusion sectionand a pulling-resistant pier in sequence from bottom to top; during factory prefabrication, the stud shearing-force connection part main body is sleeved with the fixing nut, the sleeve and the semiconductor spring from the thread section in sequence, the upper end face of the fixing nut is located at the top of the thread section and is fixed, the upper end of the sleeve is fixed to the lower endface of the fixing nut, the upper end of the semiconductor spring and the lower end of the sleeve are connected into one, and the shearing-force connection parts are mounted on a maim beam at intervals according to needed shearing resistant requirements. By the adoption of the friction-type stud shearing-force connection part and the construction method thereof, force transferring modes of traditional shearing force connection parts are improved, interface friction is reasonably utilized, the pretension force of the friction-type stud shearing-force connection part can be monitored and controlled, and the design philosophy of combining resistance and releasement can be achieved. The factory prefabrication degree is high, bolt splicing is conducted on the spot, and the labor cost is saved.

The invention relates to fireproof cable for a nuclear power station and a preparation method of the fireproof cable, and belongs to the technical field of special cables. The cable includes six layers, namely, a conductive copper core, a special rubber insulated fireproof layer, an inorganic-material anti-radiation layer, a halogen-free flame-retardant polymer inner sheath layer, an armored layer and a halogen-free flame-retardant polymer oversheath layer. The conductive copper core is wrapped in the special rubber insulated fireproof layer, the special rubber insulated fireproof layer is extruded and molded by a rubber extrusion device, an inorganic material wraps the special rubber insulated fireproof layer to form the anti-radiation layer, the halogen-free flame-retardant polymer inner sheath layer wraps the periphery of the anti-radiation layer by extrusion, the steel band armored layer is wrapped, and the halogen-free flame-retardant polymer oversheath layer wraps the armored layer by extrusion. The cable is characterized by high anti-radiation performance, high fireproof and flame-resistant performances, excellent flame-retardant performance and convenient laying.

The invention provides a magnetic sheet based on an amorphous or nanocrystalline strip material and a preparation method thereof, which belong to the technical field of wireless power supply systems.The magnetic sheet based on the amorphous or nanocrystalline strip material provided by the invention is formed by laminating a plurality of single-layer structures, wherein each single-layer structure comprises a magnetic layer, a bonding layer and an oxide layer; the magnetic layer is of a scaly structure, and the scaly structure can increase contact resistance and reduce eddy current loss; andthe oxide layer has high electrical resistivity and can replace the conventional air or bonding layer for insulation. Through controlling the thickness of the oxide layer, the gasp of the scaly structures can be controlled, and the precise controllability of the magnetic conductivity of the magnetic sheet is realized. Meanwhile, the bonding layers of the magnetic sheets do not fill in the gaps ofthe scaly structures, thus the bonding thickness can be reduced, and the thickness of the magnetic sheet is small.

The embodiment of the invention relates to the technical field of display, and discloses a display panel and a display device. The display panel comprises a substrate, an interlayer dielectric layer and a metal layer which are sequentially stacked, and the display panel comprises a display area and a non-display area. A metal layer is arranged in the non-display area, a groove is formed at the position, located in the non-display area, of the interlayer dielectric layer, and the side wall of the groove is at least covered by the metal layer. According to the display panel and the display device provided by the invention, the packaging performance of the display panel can be improved.

The invention relates to a chip packaging and radiating mode. A chip packaging structure prepared through the mode comprises a chip main body, a macromolecule packaging material layer and at least two thermal bimetallic strip assemblies. The chip packaging and radiating mode has the beneficial effects that the radiating surface area is increased when chips emit heat, and the radiating surface area is reduced when the chips do not emit heat, so that dust accumulated on the surfaces of the chips is reduced, and the radiating efficiency of the packaging structure is improved.

The invention provides a submerged arc furnace electrode sealing device which is arranged between a water-cooling protection screen of an electrode mast of a submerged arc furnace and a water-cooling jacket of a furnace cover. The submerged arc furnace electrode sealing device comprises a sealing ring and a sealing ring support; the sealing ring support is arranged on the water-cooling jacket of the furnace cover, and is fixedly connected with the water-cooling jacket through a fastener; the sealing ring is arranged in the sealing ring support, and makes close contact with the water-cooling protection screen; the sealing ring is made of fire-resistant materials. Because the sealing ring is made of the fire-resistant materials instead of cast copper, the submerged arc furnace electrode sealing device saves materials and cost, plays a role in sealing a gap between the electrode mast and the furnace cover, and ensuring that the electrode mast and the furnace cover are insulated, avoids the phenomenon that the furnace generates heat because an insulating plate in a traditional submerged arc furnace electrode sealing device burns, is carbonized and loses efficacy, and prolongs the service life of equipment like the furnace cover.

The invention relates to an ice-making assembly. The ice-making assembly comprises an ice-making cavity, an ice machine mounted on the upper portion of the interior of the ice-making cavity, and an ice storage box located on the lower portion of the interior of the ice-making cavity. The ice-making assembly further comprises a movable partition plate arranged between the ice machine and the ice storage box and used for enabling the ice machine to communicate with the ice storage box or isolating the ice machine from the ice storage box. According to the ice-making assembly, the ice making and ice storage zones are partitioned, energy loss is reduced, and the ice making amount is improved; meanwhile, the situation that the temperature in the ice storage box fluctuates when the ice machine starts to heating for deicing, and accordingly the storage of ice blocks is influenced can be avoided; and the ice making and ice storage zones are partitioned, the temperature of an ice storage chamber is relatively high, a bubble layer around the ice storage chamber can be thinned, the size of the ice storage chamber is increased, and thus the ice storage amount is increased.

The invention discloses an efficient natural gas directional flow heating system, and relates to the technical field of heating systems. The efficient natural gas directional flow heating system comprises an adjusting module and an induction coil wound outside a heat exchange tube. The heat exchange tube comprises a natural gas inlet and a natural gas outlet, the heat exchange tube is provided with a temperature detection instrument at the natural gas outlet, and the adjusting module detects the temperature according to the temperature detected by the temperature detection instrument to adjustthe working current, power and other parameters of the induction coil. A directional flow device for guiding natural gas to the position of a heat exchange wall is arranged inside the heat exchange tube. According to the scheme, compared with other methods heating from outside, the efficient natural gas directional flow heating system has advantage that the heating speed is fast, the heating timeis only 10% -20% of that of other heating methods, the heating uniformity is high, and the heat efficiency is high.

The invention discloses a cold and hot impact test method for an electronic structural member and test equipment, the test equipment comprises a base plate and a first test box, the top of the base plate is provided with a combined chute, the interior of the combined chute is slidably connected with a sliding block, the top of the sliding block is provided with a turntable, the top of the turntable is provided with a vertical rod, the surface of the vertical rod is provided with two groups of symmetrically arranged electric telescopic rods, the tail ends of the electric telescopic rods are in threaded connection with threaded rods, the bottoms of the threaded rods are provided with a placement frame, and the surface, away from the electric telescopic rods, of the placement frame is provided with a first test box and a second test box which are symmetrically arranged. According to the invention, the first test box and the second test box are arranged to detect and analyze the specific condition of the performance of the electronic structural member when the electronic structural member is subjected to a cold and hot impact test, and the detection plate and the reagent bottle are arranged to observe the color change condition of a solution in the reagent bottle and the precipitation generation condition, and whether the material performance of the electronic structural member is good or not can be judged.

The invention discloses a feed-through screw connection structure for a generator stator core. The generator stator core is formed by laminating a plurality of core laminations; a feed-through screw passes through a feed-through screw hole of the generator stator core and the plurality of laminated core laminations are pressed and fixed together; an insulating layer prepared from a flexible material is arranged on the periphery of a corresponding segment, in the feed-through screw hole, of the feed-through screw; the diameter of the corresponding segment, provided with the insulating layer, ofthe feed-through screw is not smaller than the aperture of the feed-through screw hole; the feed-through screw is put into the feed-through screw hole; and then the periphery of the insulating layerof the feed-through screw is in contact with a hole wall of the feed-through screw hole. On the basis of an existing feed-through screw structure, the insulating layer prepared from the flexible material is arranged on the periphery of the feed-through screw, and the insulating layer is in contact with the hole wall of the feed-through screw hole, so that multi-point contact of the feed-through screw and the core is achieved to improve the inherent frequency of the screw, the inherent frequency is far away from the vibration frequency of the core, resonance is avoided, and meanwhile, the feed-through screw connection structure plays a screw insulating role.

The invention belongs to the cable technology field and relates to a novel flexible halogen-free flame-retardant fire-prevention cable and a manufacturing method thereof. The cable comprises four layers of structures and is formed by a conductive copper wire core, an insulation fire-prevention layer made of a special rubber / inorganic nano particle hybrid composite material, an inorganic composite band fireproof layer and a halogen-free flame-retardant polymer sheath layer. The insulation fire-prevention layer wraps the conductive copper wire core and the layer carries out extrusion molding through rubber extrusion processing equipment. A fireproof inorganic composite band wraps above the insulation fire-prevention layer so as to form a fireproof layer. And finally, through extrusion processing, the halogen-free flame-retardant polymer sheath layer wraps a periphery of the fireproof layer. Compared to other fireproof cables, the cable of the invention has characteristics that the cable has good flexibility so that the cable can be bended at a large degree; good fireproof fire-prevention performance is possessed; flame-retardant performance is good and a smoke amount is low; during a production process, a length of the cable is not limited; and laying is convenient and cost is low.

The invention discloses a low-power-consumption redundant current sharing circuit based on a PMOS. The invention belongs to the technical field of power electronics. The PMOS-based low-power consumption redundant current sharing circuit can be applied to a load side; current sharing of two power supplies is not required; the requirement on the consistency of the output voltages of the two power supplies is relatively low; according to the circuit, a PMOS is used for applying negative voltage to a gate electrode; the low-resistance on-state characteristic between the drain electrode and the source electrode is realized; and the impedance between the drain electrode and the source electrode is controlled by the gate voltage amplitude. Measures such as a sampling resistor and an operational amplifier are combined; the input impedance of the two power supplies is automatically adjusted; current sharing of the two power supplies is realized; when the local heat of the circuit is too high inthe using process, the insulating liquid is pushed out and sprayed on the outer side of the gasket under the dispersion action of the release holes, and a layer of insulating liquid film is formed between the inner walls of the contact end holes under the action of the capillary fiber thorns, so that the whole circuit is insulated when the local temperature is too high.