207results about How to "Avoid conduction" patented technology

The invention discloses an alumina fiber reinforced mullite ceramic-based composite material with volume concentration gradient distribution, which is composed of continuous alumina fiber cloth and a mullite ceramic matrix, the continuous alumina fiber cloth and the mullite ceramic matrix are in volume concentration gradient distribution, the volume density of the alumina fiber at the center is 50-60%, and the volume density of the alumina fiber at the center is 50-60%. The volume density of the mullite ceramic is 10-20%, the volume densities of the alumina fiber and the mullite ceramic are gradually increased from the center to the outside, the volume density of the surface alumina fiber is 70-80%, the volume density of the mullite ceramic is 20-30%, and the surface alumina fiber and the mullite ceramic form a compact structure which can block air conduction. The heat insulation performance of the alumina fiber reinforced mullite ceramic-based composite material is remarkably improved, and the high-strength characteristic is achieved while the light weight is achieved.

The organosilicon-polyurethane foam encapsulating material is composed of a component A and a component B. The component A comprises sucrose initial polyether polyol, sorbitol initial polyether polyol, a water-containing alcohol amine foaming agent, a catalyst and a halogen-free flame retardant, and the component B comprises an NCO-terminated polysiloxane-polyurethane prepolymer, silicone oil and a diluent. Wherein the water-containing alcohol amine foaming agent comprises isopropyl alcohol di-sec-butyl alcohol amine, a mixture of isopropyl alcohol sec-butyl alcohol amine and water. The two-component encapsulating material is used for encapsulating a new energy battery module.

The invention relates to a flame-retardant cellulose composite film and a preparation method thereof, belongs to the field of flame-retardant materials, and aims to solve the problems that a cellulose film is inflammable, poor in compatibility with an inorganic flame retardant, relatively low in mechanical property and the like. The main components of the composite membrane comprise nanocellulose, titanate nanofibers, carbon dots and a cross-linking agent. The preparation method comprises the following steps: firstly, enabling the carbon dots to react with the nanocellulose under the action of an initiator; secondly, adding titanate nanofibers into the carbon dot modified nanocellulose suspension, and uniformly mixing; then, adding a cross-linking agent and uniformly dispersing to obtain a mixed solution; and finally, casting the solution into a culture dish, and curing in a vacuum drying oven to prepare the flame-retardant cellulose composite film. According to the preparation method, the compatibility of the flame retardant and the nano cellulose is remarkably improved, the mechanical property is enhanced, and the composite film has excellent flame retardance, smoke suppression and heat insulation characteristics and is suitable for preparing the flame-retardant cellulose composite film.

The utility model belongs to the technical field of integrated circuit boards, and particularly relates to a fixing device for integrated circuit board production and processing. Comprising a supporting seat; the workbench is arranged on the supporting seat; the fixing mechanism is arranged on the workbench and used for clamping and fixing the circuit board; the damping mechanism is arranged on the workbench, and the damping mechanism is matched with the fixing mechanism and used for achieving a damping effect when the fixing mechanism clamps the circuit board; the heat dissipation mechanism is arranged on the workbench and used for conducting heat dissipation on the circuit board; the heat dissipation mechanism comprises through grooves formed in the front side and the rear side of the workbench, and the through grooves extend upwards to penetrate through the workbench; the supporting cylinder is arranged in the through groove; the heat dissipation fan is arranged in the supporting cylinder in a bolt connection mode; the power source is used for providing power and driving the cooling fan to rotate; and the dustproof net is arranged on the upper side in the through groove. The utility model provides a fixing device for production and processing of an integrated circuit board, which can dissipate heat of the integrated circuit board.

The invention relates to the field of motors, and provides an integrated permanent magnet synchronous motor which comprises a motor body, a controller, a controller shell, a pi-shaped filter and a common mode filter, the controller shell is detachably connected with the motor body, and the controller, the pi-shaped filter and the common mode filter are all arranged in the controller shell. And the motor body, the pi-shaped filter and the common-mode filter are electrically connected with the controller. The permanent magnet synchronous motor solves the problems that a permanent magnet synchronous motor in the prior art is high in cost, tedious in installation and arrangement and low in integration degree, and achieves the technical effects that the motor body is connected with the controller shell, and then the controller is arranged in the controller shell, so that the motor body and the controller are integrated into a whole; therefore, the reliability of the motor is improved, the space utilization is saved, the maintenance cost is reduced, the efficiency is improved, the flexibility is enhanced, and the electromagnetic interference failure can be effectively avoided by arranging the pi-shaped filter and the common-mode filter.

The utility model discloses a supporting device for a tungsten cylinder crucible of a sapphire crystal growth furnace, relates to the technical field of spar forming equipment, and aims to provide the supporting device for the tungsten cylinder crucible of the sapphire crystal growth furnace, which can lift the crucible and is convenient for taking, placing, feeding and discharging the crucible, and has the technical key points that the supporting device comprises a supporting frame, and a furnace body is arranged on the supporting frame; a cover plate is arranged at the top of the furnace body, a vacuumizing pipe is arranged on the side face of the furnace body, a lifting component is arranged on the supporting frame, the top end of the lifting component extends into the furnace body, and a movable plate is arranged at the top end of the lifting component. The threaded telescopic rod jacks upwards and drives the movable plate to move upwards, and the movable plate bears the tungsten crucible and drives the tungsten crucible to jack upwards, so that the tungsten crucible moves to the position of the opening in the upper portion of the furnace body, the purpose of jacking the tungsten crucible is achieved, and taking, placing, feeding and discharging of the tungsten crucible are facilitated.

The invention belongs to the technical field of polyurethane coatings, and provides a cellulose nanocrystal enhanced heat-insulating bio-based polyurethane coating and a preparation method thereof, according to the coating, porous cellulose nanocrystals are introduced, and a silicon dioxide film is deposited on the surfaces of the porous cellulose nanocrystals, so that the heat-insulating property, weather resistance and mechanical property of the material are remarkably improved. The castor oil adopted as a bio-based raw material has the advantages of being renewable and environmentally friendly, and the defects of a traditional petroleum-based polyurethane material in the aspects of environmental protection and resource consumption are overcome. Through epoxidation treatment on castor oil, the reaction activity and hydroxyl density of the material are increased, and further fluorination and silanization modification are performed, so that the hydrophobicity, chemical stability and surface energy reduction effect of the coating are effectively improved; the prepared bio-based polyurethane coating has excellent mechanical properties, long-acting weather resistance and an excellent heat reflection effect.

The invention provides a back contact battery, a photovoltaic module and a photovoltaic system. The back contact battery comprises a battery substrate, a plurality of main grids, a plurality of slurry nodes and a plurality of first insulating parts. The battery substrate comprises a tandem connection area and a non-tandem connection area; a plurality of slurry nodes are formed in the cascading area; the first insulating parts are arranged in the serial connection area, the first insulating parts and the main grids are correspondingly arranged, the first insulating parts are arranged in the first direction, the first insulating parts cover the slurry nodes, in the first direction, a first gap is formed between every two adjacent first insulating parts, and part of the main grids are exposed out of the first gaps. Therefore, the first insulating parts corresponding to the main grids are arranged in the serial connection area and cover the slurry nodes, the first gaps are formed between the two adjacent first insulating parts, and the main grids are partially exposed from the first gaps, so that the first insulating parts can be arranged in blocks, the thickness of the first insulating parts is increased, the slurry nodes in the serial connection area are prevented from being conducted with the welding strip, and the reliability of the welding strip is improved. And the reject ratio of the photovoltaic module is reduced.

The invention provides high-thermal-insulation wear-resistant rubber and a preparation method thereof. Comprising the following steps: taking raw nitrile rubber, carrying out open milling, adding zinc oxide, stearic acid, microcrystalline wax and an anti-aging agent, and carrying out mixed open milling; adding the thermal-insulation wear-resistant filler into the open milling system, and uniformly mixing; adding an accelerant TMTD and sulfur, carrying out triangular package making for multiple cycles, carrying out thin-passing to obtain sheets, and standing to obtain a rubber compound; and putting the rubber compound into a plate mold, and vulcanizing by using a plate vulcanizing machine. A multi-layer heat insulation structure is formed by adopting the heat preservation and wear-resisting filler compounded by the hydrophobic porous aluminum oxide hollow spheres and the dendritic silicon dioxide, the hydrophobic porous aluminum oxide hollow spheres can effectively prevent heat conduction due to a hollow air filling structure, the heat conductivity is very low, and meanwhile the heat preservation and wear-resisting properties of the hydrophobic porous aluminum oxide hollow spheres are greatly improved due to the hydrophobic characteristic of the hydrophobic porous aluminum oxide hollow spheres. The low-thermal-conductivity ceramic is free from the influence of moisture and keeps stable low thermal conductivity, and the dendritic silicon dioxide can be used as a skeleton support and keeps the stability and durability of the whole low-thermal-conductivity ceramic.

The invention discloses a solar cell and a photovoltaic module, and the solar cell comprises a cell substrate and an insulating part, the back surface of the cell substrate is provided with conductive layers and current collection electrodes, an isolation region is arranged between a first conductive layer and a second conductive layer which are adjacent, the first current collection electrode is provided with a first tandem part, and the second current collection electrode is provided with a second tandem part; the insulating part comprises first insulating parts and second insulating parts, and the first insulating parts are arranged at the positions, corresponding to the second tandem parts, of the first conductive layer and the second conductive layer respectively, and the positions, corresponding to the first tandem parts, of the second conductive layer; the second insulating parts are arranged on the two sides of the first insulating part in the second direction; the second insulating part covers the conductive layer and the collector electrode on two sides of the first insulating part along the second direction. The second insulation part is used for forming insulation isolation between the first conductive layer and the second conductive layer in the non-electric connecting piece connecting area, and the risk of short circuit of the solar cell is reduced.

The invention relates to an intelligent motor overload and overvoltage absorption circuit with protection and a control method thereof, and the circuit comprises a control module, a preset protection voltage adjustment module, a voltage sampling module, a voltage comparison module, an overtime and overvoltage judgment module, and a power absorption module. A comparison signal output end of the voltage comparison module is connected with a comparison signal input end of the overtime overvoltage judgment module, a judgment signal output end of the overtime overvoltage judgment module is connected with a controlled end of the power absorption module, and a sampling signal output end of the overtime overvoltage judgment module is connected with a sampling signal input end of the control module. The overtime control signal output end of the control module is connected with the overtime control signal input end of the overtime overvoltage judgment module, and the overtime overvoltage judgment module not only can monitor the occurrence of an overload overvoltage signal, but also can judge the duration of the signal, thereby avoiding the long-time conduction of a resistor, and improving the reliability of the circuit. The problem of overheating or burnout caused by continuous conduction of a resistor in traditional hardware protection is solved.

The invention discloses a PFC overcurrent protection circuit and a PFC circuit. The PFC overcurrent protection circuit comprises a current sampling module, a reference voltage generation module, an overcurrent comparison module, a hardware protection module, a software protection module, a PFC driving module and a reset signal output module. And the reset signal output module is respectively connected with the output end of the software protection unit and the input end of the overcurrent comparison module. According to the PFC overcurrent protection circuit, when overcurrent occurs in the PFC circuit, two protection modes of hardware protection and software protection can be combined, the reference voltage is not liable to be interfered, and the reliability of PFC overcurrent protection is improved.

The utility model relates to the technical field of PVC (polyvinyl chloride) pipes, and discloses a high-temperature-resistant flame-retardant macromolecular PVC pipe which comprises an inner pipe body, a high-temperature-resistant layer is fixedly connected to the surface of the inner pipe body, a heat-insulating layer is fixedly connected to the surface of the high-temperature-resistant layer, an outer pipe sleeve is arranged on the surface of the heat-insulating layer, a fireproof layer is coated on the surface of the outer pipe sleeve, and the fireproof layer is coated on the surface of the outer pipe sleeve. The flame retardant is arranged in the outer pipe sleeve, when flame burns into the outer pipe sleeve through the outer pipe sleeve, the flame retardant can effectively conduct flame retardance, and under the action of the high-temperature-resistant layer and the heat insulation layer, the temperature inside and outside the pipe can be effectively isolated; therefore, the liquid flowing in the pipe is prevented from being influenced by the temperature outside the pipe, the heat preservation effect on the liquid in the pipe is improved, and the high-temperature-resistant layer and the heat insulation layer have the flame-retardant effect.

The utility model discloses a screwdriver with a heating function. The screwdriver comprises a main body, a screwdriver rod, a screwdriver head, a screwdriver tip, a repair interface, a temperature sensor, an electric heating wire, a current sensor, a relay, a resistor and an LED lamp bead. According to the utility model, the electric heating wire and the temperature sensor are additionally arranged, so that the heating power is accurately adjusted, and the problem of excessive or insufficient heating is avoided. The temperature sensor monitors the surface temperature of the screwdriver, real-time detection is achieved, protection measures are taken, and the equipment safety is improved. The heat insulation performance is good, discomfort and scald risks of users are reduced, and the use comfort and the working efficiency are improved. In addition, a current sensor and a relay are added to realize an automatic power-off function, current change is judged according to a threshold value, and feedback control is provided. And the timer and the temperature sensor can meet individual requirements. The LED lamp beads and the switching circuit reduce energy consumption, improve the energy utilization rate and provide the illumination effect with adjustable brightness.

The invention provides a power supply circuit and electronic equipment, which are applied to the technical field of switching power supplies, the circuit comprises a controller, a power conversion circuit and an under-voltage protection circuit, a SiC MOSFET switching tube is arranged in the power conversion circuit, the under-voltage protection circuit detects the current driving voltage output by a first driving port of the controller, and the current driving voltage is output by a second driving port of the controller. The current driving voltage of the SiC MOSFET switch tube is smaller than the preset protection voltage, the first control signal is output to the configuration port of the controller when the current driving voltage of the SiC MOSFET switch tube is smaller than the preset protection voltage, the controller is triggered to turn off the SiC MOSFET switch tube, and as the preset protection voltage is larger than or equal to the rated minimum driving voltage of the SiC MOSFET switch tube, reliable turn-off of the SiC MOSFET switch tube can be effectively controlled, and the reliability of the SiC MOSFET switch tube is improved. And the safety and the reliability of the SiC MOSFET switch tube and the power supply circuit are improved.

The utility model discloses a novel pressure coffee machine, including frame component, base component, water pump, support component and heating pot, base component includes base body and bottom cover, frame component includes main frame, front cover and top cover, and is provided with vertical chamber in main frame, and main frame is connected with front cover and top cover, and lower extreme is connected with base body, support component includes water pump support and buffer connecting piece, water pump support sets up in vertical chamber, and is provided with installation chamber in the inside, and the upper end of water pump support is connected with main frame, and the lower extreme is connected with bottom cover after penetrating base body, and water pump is set up in installation chamber through buffer connecting piece, and buffer connecting piece and water pump support quick -release type clamping connection. The utility model discloses through setting up the support component with damping structure between water pump and main frame, and to the mounting mode and structure design of support component, avoid the vibration of water pump work to be conducted to complete machine, effectively block the noise transmission to the outside, improve the experience feeling, prolong the life.

The invention discloses a formula and a preparation method of a reflective heat-insulating coating for a metal roof, comprising the following raw materials in parts by mass: 50-57 parts of styrene-acrylic emulsion, 12-15 parts of titanium dioxide, 10-15 parts of nano titanium dioxide, 16-18 parts of modified ceramic hollow microspheres, 16-20 parts of deionized water, 2-3 parts of a film-forming aid, 0.3-0.5 parts of a defoaming agent, 0.1-0.3 parts of a preservative, 0.06-0.12 parts of a multifunctional aid, 0.1-0.2 parts of a dispersant, and 0.4-0.6 parts of a thickener. The nano titanium dioxide is rutile nano titanium dioxide that has been surface treated with inorganic substances, and the modified ceramic hollow microspheres are ceramic hollow microspheres that have been modified with nano zinc oxide. The invention can significantly improve the anti-ultraviolet performance of the coating, reduce the damage of ultraviolet rays to the coating, and increase the service life by adding nano-grade titanium dioxide to the reflective thermal insulation coating for metal roofs. By adding modified ceramic hollow microspheres to the reflective thermal insulation coating for metal roofs, the heat transfer inside the building can be effectively reduced and the indoor temperature can be lowered.

The utility model relates to the technical field of cables, and discloses a high-temperature-resistant cable, which comprises a conductor, a braid layer arranged on the outer side of the conductor, a plurality of filling ropes arranged in the braid layer, a wire core arranged in the braid layer, a silicon rubber insulating layer arranged on the outer side of the braid layer, and a heat insulation layer arranged on the outer side of the silicon rubber insulating layer. The outer side of the heat insulation layer is provided with a wear-resistant layer, the outer surface of the wear-resistant layer is provided with an outer protection layer, the filling ropes are arranged between the adjacent conductors, and the wire cores are arranged at the centers of the conductors. According to the utility model, through the cooperation between the silicone rubber insulating layer and the thermal insulation layer, the influence of external high temperature on the interior of the cable is effectively reduced, and heat is prevented from being conducted to the conductor and the wire core, thereby protecting the safe operation of the cable, and solving the problem that the cable has potential safety hazards in use under a high-temperature condition due to the single material of part of cables. Through the materials, the high temperature resistance of the cable is improved.

The utility model discloses a kind of heat preservation airtight inspection grain door, including door frame, the inside left and right sides of door frame are hinged with door panel by hinge, further including sealing heat preservation mechanism;Sealing heat preservation mechanism: it includes baffle, avoidance groove, recess, sealing ring, L type slot, installation slot, sealing ring and heat preservation assembly, recess is set in the outer surface of the door panel, recess is equipped with sealing ring in its inside, the left side of the door panel of right side is equipped with baffle, the right side of the door panel of left side is equipped with avoidance groove, two door panels close, the front side of baffle and the back side of avoidance groove are pasted, this heat preservation airtight inspection grain door, sealing heat preservation mechanism is sealed to granary, when door panel closes, sealing ring and sealing ring cannot be exposed in outside, avoid the case of the occurrence of the sealing property of granary door due to sealing ring and sealing ring exposed easily aging or being gnawed by rodent, and heat preservation effect is good.

The utility model relates to a kind of hot steam humidifiers, it includes: base, box, heating can and top cover, heating piece is equipped in base. Box is installed on base, its top has opening, its bottom is provided with let go of mouth, and opening and let go of mouth are respectively communicated with the inside of box. Heating can is installed in box, and the inner wall between its outer wall and box is enclosed to form water storage cavity, heating can is hollow to form heating cavity, heating cavity is communicated with heating piece by let go of mouth, and heating piece is used to heat the liquid in heating cavity. Top cover is connected with box, to close opening, and top cover is provided with mist outlet hole communicated with heating cavity on it. Wherein, heating cavity and water storage cavity have water passing cavity, the top end of water passing cavity has water passing hole communicated with water storage cavity, and water passing cavity is equipped with ball float for opening or plugging water passing hole, when ball float opens water passing hole, water storage cavity and heating cavity are communicated by water passing cavity, when ball float plugs water passing hole, water storage cavity and heating cavity are not communicated.

The utility model belongs to the technical field of solid waste resources, and particularly relates to solid waste resourceful treatment integrated equipment based on pyrolysis gasification, which comprises a pyrolysis gasification furnace, a feeding port is arranged on one side of the pyrolysis gasification furnace, and a control box is arranged on the outer wall of the other side of the feeding port. Two inserting plates are symmetrically welded on one side, facing the outer wall of the pyrolysis gasification furnace, of the control box; according to the utility model, the control box is mounted, and the two insertion plates on one side of the control box penetrate through the corresponding rectangular grooves in the heat insulation plate, so that the two notches in the insertion plates can be clamped with the corresponding stop levers and are positioned. In addition, when the inserting plate penetrates through the heat insulation plate, the arc-shaped outer wall of the inserting plate can extrude the clamping tongue into the inner cavity, when the inserting plate is installed in place, the spring can push the clamping tongue to reset at the moment, and therefore the clamping tongue can be in butt joint with the inserting opening. As the heat insulation plate is in butt joint with the pyrolysis gasification furnace through the fixing strips on the two sides of the heat insulation plate, the control box can be in butt joint with the pyrolysis gasification furnace conveniently through the structure.

The utility model discloses a powder forming heat treatment device. The powder forming heat treatment device comprises a middle die holder, an upper die holder and a lower die holder, an upper guide column is arranged on the top of the middle die holder, and the upper die holder is movably arranged on the upper guide column. A lower guide column is arranged at the bottom of the middle die holder, and the lower die holder is movably arranged on the lower guide column. A middle die is arranged on the middle die holder; the upper die holder is provided with an upper die; the lower die holder is provided with a lower die, an upper die and a middle die, and a heating element is arranged in the lower die; the upper die holder is provided with an upper cooling pipeline surrounding the outer side of the upper die; the lower die holder is provided with a lower cooling pipeline surrounding the outer side of the lower die; the cooling system further comprises a cooling water input pipe and a cooling water discharge pipe, and the upper cooling pipeline and the lower cooling pipeline are connected with the cooling water input pipe and the cooling water discharge pipe respectively. And heat dissipated by the plug can be completely surrounded and prevented from being conducted to the peripheries of the upper die base and the lower die base, the upper guide column and the lower guide column cannot expand with heat and contract with cold due to heat conduction, and therefore the machining precision is guaranteed.

A semiconductor processing device and its base support assembly include a central support pillar and at least three edge support pillars. The central support pillar coincides with the central axis of the base, limiting base eccentricity after heating and solving the eccentricity problem caused by the different linear expansion of the support pillar and the base. By reducing the cross-sectional area of ​​the central support pillar, the influence of light refraction and reflection on the thermal radiation optical path of the base is reduced. By reducing the contact area between the support pillar and the base, temperature conduction is reduced, thereby improving temperature uniformity. Each support pillar includes an upper pillar and a lower pillar made of different materials. The light absorption rate of the upper pillar is the same as or similar to that of the base, making the temperature difference between the upper pillar and the base approach zero, ensuring good temperature uniformity of the base. The upper pillar has extremely low thermal conductivity, which can block heat conduction from the upper pillar to the lower pillar, reducing heat loss, ensuring heat balance of the base, and improving the temperature distribution uniformity of the substrate.

The utility model discloses an electronic atomizer, an atomizing core and an electronic atomizing device, and mainly relates to the technical field of atomizers, a liquid cup base is sleeved with a liquid cup shell, and the atomizing core is arranged between the liquid cup shell and the liquid cup base; the two ends of the atomization shell are connected with the liquid cup shell and the liquid cup base respectively, the interior of the atomization shell is hollow to form an atomization air channel, a liquid guide hole is formed in the atomization shell and communicates with the liquid storage bin and the atomization air channel, the shell air channel is formed in the atomization shell, and the liquid guide hole and the shell air channel are arranged in an avoiding mode; the electronic atomizer further comprises an atomization air inlet hole and an air outlet hole, the atomization air inlet hole is formed in the side wall of the liquid cup shell, and the air outlet hole is formed in the side, away from the liquid cup base, of the liquid cup shell. The atomization air inlet hole, the shell air channel, the atomization air channel and the air outlet hole are sequentially communicated to form an aerosol channel. Through the design, the situation that condensate generated by aerosol cooling leaks out is avoided, the preparation difficulty of the liquid cup shell is lowered, and the connection stability of the atomization core is improved.

The utility model discloses a kind of composite aluminum alloy windows of high-efficiency sound insulation and heat insulation, including two groups of beam body, sound insulation cavity is set in the beam body, sound insulation block is filled in the sound insulation cavity, multiple hexagonal through-holes are passed through and set in the outer wall of sound insulation block, two groups of the beam body are connected by heat insulation bridge, the outer wall of beam body is provided with connecting groove and connecting along, multiple support columns are set in the sound insulation cavity, multiple the support column is obliquely arranged alternately, and inside is hollow shape.The utility model fills sound insulation block with hexagonal through-hole in beam body sound insulation cavity, and the layout of zigzag of hollow support column is alternately inclined, convert traditional single, double-cavity linear type sound wave path into composite path of multiple refraction+multiple reflection, effectively weaken the penetration of medium-high frequency noise, simultaneously, hollow structure of support column can be filled with sound-absorbing material, further inhibit structure sound transmission, solve the problem that traditional profile cavity directly conducts noise and is easy to deform after filling.

The utility model relates to the technical field of hydrogen storage devices, in particular to an efficient hydrogen storage device which comprises a storage tank, a three-way valve is fixed and communicated to the upper end of the storage tank, a heat insulation pad is fixedly connected to the lower surface of the storage tank, a heat insulation shell is fixedly connected to the surface of the heat insulation pad, and the storage tank is located in the heat insulation shell. The surface of the storage tank is fixedly sleeved with a heat insulation ring, the heat insulation ring is fixedly connected with a heat insulation shell, the arc surface of the heat insulation shell is fixed and communicated with a liquid inlet pipe, the arc surface of the heat insulation shell is fixed and communicated with a liquid drainage pipe, and the surface of the liquid drainage pipe is fixedly connected with a valve. According to the hydrogen storage device, under the cooperation of the heat insulation ring and the heat insulation pad, a cavity can exist between the storage tank and the heat insulation shell, so that external heat is prevented from being directly conducted to the storage tank through the heat insulation shell, the situation that hydrogen is rapidly separated out due to the fact that solid materials in the storage tank are heated is prevented, and the storage efficiency of the hydrogen is improved.

The invention relates to the technical field of polymethyl methacrylate, and discloses a flame-retardant polymethyl methacrylate material and a preparation method thereof.The flame-retardant polymethyl methacrylate material is obtained by reacting polymethyl methacrylate, a hydroxyl-terminated flame retardant and p-toluenesulfonic acid. The linear polymethyl methacrylate is crosslinked into a three-dimensional network structure, so that the crosslinking degree between molecular chains is enhanced, the molecular chains are not easy to slip under stress, good structural stability is maintained, and the polymethyl methacrylate has high tensile strength and bending strength. The flame retardant contains piperazine rings and phosphate structures, forms an intumescent flame-retardant system, generates phosphoric acid substances, nitrogen and other gases during combustion, promotes dehydration of a matrix to form an intumescent carbon layer, isolates oxygen, prevents heat conduction, inhibits the combustion process, remarkably reduces the peak value of the heat release rate and the total heat release amount, and has excellent flame-retardant performance.

The utility model discloses a flexible circuit board for a power battery pack of a new energy automobile, relates to the technical field of circuit boards, and solves the problems that the conventional flexible circuit board for the power battery pack of the new energy automobile is easy to soften due to the fact that the battery pack is easy to generate part of heat, the aging of the flexible circuit board is caused, and the service life of the flexible circuit board is prolonged. And the service life of the power battery pack is further influenced. Comprising a wiring board, one end of the wiring board is connected with a substrate main body, the other end of the substrate main body is fixedly connected with a terminal, the substrate main body is composed of an upper covering film, a copper foil wire, a lower covering film and a reinforcing sheet, and six bending grooves are formed in the substrate main body; according to the utility model, heat generated by the battery pack is prevented from being conducted into the substrate main body, the generated heat is dissipated, and the heat dissipation frame is quickly fixed outside the protective frame, so that the substrate main body can be quickly disassembled and assembled.

PROBLEM The present invention provides a vehicle steering wheel device enabling reliably activating the horn while preventing conduction failure of the conductive circuit for sounding the horn even if there is movement in the mounting pin member that connects the steering wheel and airbag module. RESOLUTION MEANS A horn spring 15 provided between a steering wheel 1 and an airbag module 2 that serves as a damper mass; a damper unit 10 provided on the airbag module; and a pin 11 having a first end 11a retained in the steering wheel and a damper unit slidably provided on a second end 11b are provided; wherein the horn conductive circuit 5 includes the pin formed of a conductive material, a horn contact 22 provided on the airbag module that contacts and separates with the pin by means of elastic deformation of the horn spring, and a U shaped spring 26 provided on the steering wheel that is clipped to and conducts with the pin.