93results about How to "Facilitate conduction" patented technology

The utility model relates to the field of optical fiber communication, and disclose a kind of optical fiber communication device of conference communication system, including shell and optical fiber communication body, shell interior is equipped with optical fiber communication body, shell one side dustproof heat dissipation structure, dustproof heat dissipation structure is equipped with liquid cooling structure in shell, shell is away from dustproof heat dissipation structure and is equipped with a set of equidistant distribution's heat dissipation hole two on the other side of the optical fiber communication body, there is dust screen in shell outside one side with heat dissipation hole two and every heat dissipation hole two is fixedly connected, adopt liquid cooling structure and heat dissipation fan collaborative heat dissipation mode, effectively solved the problem of traditional device heat dissipation capacity, in liquid cooling structure, fatty acid coolant phase transition temperature in heat absorption box is low, can rapidly absorb heat gasification when equipment temperature rises, backflow after cooling liquefaction by condenser pipe, form closed cycle continuous heat dissipation, when temperature exceeds preset value, heat dissipation fan starts, and liquid cooling system collaborative work, accelerate heat conduction and discharge.

The invention relates to a cobalt-free ultra-high nickel positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: ball-milling and mixing a nickel source, a lithium source and a dopant to obtain powder, and drying and sintering the obtained powder to obtain the cobalt-free ultra-high nickel positive electrode material, the doping agent comprises an aluminum-containing doping agent and a manganese-containing doping agent; the nickel source, the lithium source and the doping agent are mixed according to the molar ratio of the nickel element to the lithium element to the total doping element being (0.90-0.98): (1.03-1.06): (0.02-0.10). The Al and Mn elements are uniformly doped in the positive electrode material substrate through a solid-phase reaction method, the material performance is synergistically improved by utilizing the unique action mechanism of the doped elements, the electrochemical performance is synergistically improved on the premise of not depending on the cobalt element, and high initial discharge capacity, cycling stability and rate capability are kept in a wide voltage interval; and excellent capacity retention capability is shown in a wide multiplying power range.

The invention relates to the technical field of medical instruments, and provides a shock wave peripheral balloon catheter which comprises a guide tube, a balloon body and an electrode unit, the balloon body is arranged at the far end of the guide tube, and the electrode unit is arranged at the position, corresponding to the balloon body, of the outer wall of the guide tube. A filling area is arranged between the balloon body and the guide tube, the filling area comprises conduction areas and supporting areas, the conduction areas and the supporting areas are arranged at intervals and form a group, a plurality of groups of electrode units are arranged on the circumference of the guide tube, and a plurality of electrode units are arranged on the periphery of the guide tube. The multiple electrode units are distributed in the axial direction and the circumferential direction of the guide pipe at equal intervals, and the electrode units are arranged corresponding to the conduction area. By means of the technical scheme, the problem that in the prior art, shock waves of a balloon catheter are not uniform is solved.

The application provides a phase change temperature control internal curing function aggregate for high-strength concrete and a preparation method thereof, and relates to the technical field of building materials. A phase change material paraffin is arranged in an inner layer, and a heat conduction water storage layer composed of carbon fibers, graphite powder, superabsorbent resin, fly ash, phosphorus slag powder, slag powder, quicklime, polyacrylamide, clear lime water and an additive is coated on the outside to form aggregate granulation and molding. The carbon fibers are connected to the dispersed graphite powder to form a heat conduction net structure with line connection points, improve the heat conduction performance, promote the heat conduction between the internal paraffin and the external environment, and the clear lime water activates the fly ash, the phosphorus slag powder and the slag powder in the ingredients to generate a hydration reaction, thereby constructing the strength of the external structure. When the temperature in the concrete is low, heat is released, the whole process is accompanied by slow water release, the double internal curing functions of temperature control and moisture are realized, the cracking of high-strength concrete caused by high hydration heat and large shrinkage is avoided, and the durability of the high-strength concrete is improved.

The invention provides metal lithium surface protection slurry and a preparation method and application thereof, and the surface protection slurry comprises the following components by weight: 5-20 parts of a metal organic framework material (MOFs); 70 to 85 parts of a solvent; 3-6 parts of a conductive agent; 3-6 parts of a thickening agent; the MOFs material comprises an MOFs material taking a zinc-based metal matrix, a cobalt-based metal matrix, a vanadium-based metal matrix, an iron-based metal matrix, an aluminum-based metal matrix, a chromium-based metal matrix, a zirconium-based metal matrix or a lanthanide-series metal matrix as metal ions or metal cluster nodes, and the conductive agent comprises an organic polymer solid electrolyte material or an organic-inorganic composite solid electrolyte material. The surface protection slurry provided by the invention can form a protection layer with excellent lithium affinity, dendritic crystal resistance and stability on the surface of metal lithium.

The utility model discloses a heat dissipation structure and a heat dissipation battery pack, and relates to the technical field of battery pack heat dissipation, the heat dissipation structure comprises a heat dissipation assembly, the heat dissipation assembly comprises a heat dissipation main body and a heat conduction plate, the heat conduction plate is used for being connected with the battery pack and transmitting heat generated by the battery pack, and the heat dissipation main body is connected with the heat dissipation main body. A heat dissipation cavity is defined by the heat dissipation main body and the heat conduction plate; and the heat conduction plate can transfer heat generated by the battery pack to the heat dissipation cavity. According to the technical scheme provided by the utility model, the problems that in the driving process of the new energy automobile, the battery pack is in a long-term working state, heat accumulation is easily caused, then the battery pack is damaged, and even serious safety accidents such as battery short circuit and fire are possibly caused can be solved.

The utility model discloses an unmanned aerial vehicle lithium battery pack installation structure which comprises a bottom plate, wing frames are fixedly arranged at the four corners of the top of the bottom plate respectively, an installation plate is detachably and fixedly installed above the wing frames, a battery pack is fixedly arranged on the installation plate, the battery pack comprises a containing frame, a battery is arranged in the containing frame, and the battery is arranged in the containing frame. Transverse grooves are formed in the four sides of the top of the mounting plate respectively, connecting blocks are fixedly arranged on the four sides of the bottom of the battery pack respectively, electric push rods are fixedly arranged at the bottoms of the connecting blocks and located in the transverse grooves, inserting grooves are formed in one sides of the transverse grooves, inserting rods are fixedly arranged at the telescopic ends of the electric push rods, and the inserting rods are fixedly connected with the battery pack. The lithium battery pack mounting structure solves the problems that an existing mounting structure is often complex in operation, time-consuming and labor-consuming, a lithium battery pack is inconvenient to replace and maintain, and meanwhile, the existing mounting structure has defects in the aspect of heat dissipation, so that the heat dissipation problem of the lithium battery pack is difficult to effectively solve.

A kind of heat dissipation structure for LED light strip, including mounting bracket and at least one heat dissipation part on mounting bracket, characterized in that, the heat dissipation part is attached with LED light strip by mounting bracket, the two sides of mounting bracket have mounting slot, for heat dissipation part to limit, the opening of mounting slot is through, the outside of heat dissipation part in mounting slot has plug-in unit, the outside of plug-in unit is provided with extension plate, the fin on the extension plate is used to conduct heat absorbed by heat dissipation part outward;Mounting bracket is made of soft material as a whole, can be well fitted on bendable light band, and the cooperation mode of mounting bracket bottom surface slot and heat dissipation part makes it possible to achieve better heat conduction and heat dissipation function at each part of light band bending, solves the problem that conventional metal heat dissipation fin cannot bend with light band, leading to part of light band cannot be covered by heat dissipation.

This utility model discloses a horizontal foil-wound iron-silicon DC reactor, comprising an iron core, a first foil-wound coil, a second foil-wound coil, an input conductive bus, an output conductive bus, a left clamp, and a right clamp. The iron core includes columns A to D. The first foil-wound coil is wound on column A, and a first conductive bus groove is provided in a first gap. The input conductive bus is connected to the first conductive bus groove, and its input end extends from one end of the first foil-wound coil. The second foil-wound coil is wound on column B, and a second conductive bus groove is provided in a fourth gap. The output conductive bus is connected to the second conductive bus groove, and its output end extends from one end of the second foil-wound coil. A first heat sink is connected between the upper parts of the first and second foil-wound coils, and a second heat sink is connected between the lower parts of the first and second foil-wound coils. This utility model has low loss characteristics and strong heat dissipation capacity, and can generate significant social benefits in terms of energy saving, safety, and industrial upgrading.

The utility model relates to anti-static filter cloth, a filter bag and a bag cage. The anti-static filter cloth comprises anti-static yarns spun by polyphenylene sulfide fibers and stainless steel fibers, the polyphenylene sulfide yarns and the anti-static yarns are woven into the anti-static base cloth layer according to a specific proportion and at intervals; polyphenylene sulfide fibers are carded into an upper-layer cotton net and a lower-layer cotton net, an antistatic base cloth layer and tens of thousands of steel needles with barbs are added between the upper-layer cotton net and the lower-layer cotton net, the fibers are wound and hooked up and down to form a non-woven fabric with certain density and strength, and the non-woven fabric is subjected to post-treatment to prepare the antistatic filter cloth. The filter bag is made of the antistatic filter cloth and is used for a dust remover in the coal chemical industry. And the bag cage is used for fixing the filter bag. The bag cage has excellent conductivity, can conduct static electricity generated in the coal chemical industry, especially in a pulverized coal collector, to the body steel structure through the bag cage, on one hand, can prevent pulverized coal from burning and damaging a filter bag due to the static electricity, and on the other hand, can prevent pulverized coal from burning or exploding due to electrostatic sparks.

The invention relates to the technical field of lithium ion battery positive electrode materials, in particular to an aluminum-yttrium-boric acid coated high-nickel positive electrode material and a preparation method and application thereof. The preparation method of the material comprises the following steps: synthesizing a doped and modified high-nickel ternary precursor from a mixed metal salt solution and a first aluminum source and / or a first yttrium source through a coprecipitation reaction; mixing the precursor with a lithium source, and performing first sintering treatment to obtain a base material; and mixing the base material with a solution containing boric acid, a second aluminum source and a second yttrium source, and carrying out solvent evaporation and second sintering treatment to obtain a final product. Through the synergistic effect of bulk phase doping and surface composite coating, generation of intragranular cracks and interface side reaction of the material in the circulation process are inhibited at the same time. The obtained positive electrode material successfully overcomes the technical problem that high capacity and long service life are difficult to consider at the same time, and the cycling stability is remarkably improved while the high specific capacity is kept.

The invention provides a lithium metal composite negative electrode, a preparation method thereof and a solid-state battery. The lithium metal composite negative electrode is of a multi-layer structure and sequentially comprises a current collector, a buffer binding layer, an active substance layer and an interface enhancement layer, the buffer binding layer is a conductive buffer material layer, the active substance layer is a lithium metal and / or lithium alloy layer, and the interface enhancement layer is a lithium metal and / or lithium alloy layer. The interface enhancement layer is a layer which contains an MOFs material, a lithium salt and an organic polymer material and has a three-dimensional porous structure. In the interface enhancement layer, an organic polymer material improves the surface mechanical strength of the negative electrode, improves the ionic conductivity and inhibits lithium metal expansion; the MOFs has a three-dimensional porous structure and can store a large number of lithium ions, accelerate ion conduction, regulate and control uniform deposition of metal lithium on the surface of the negative electrode and effectively inhibit growth of lithium dendrites on the surface of the negative electrode. The interface enhancement layer improves the compatibility between the lithium metal and the solid electrolyte, reduces the generation of side reactions, improves the cycle performance of the metal lithium solid-state battery and prolongs the service life of the metal lithium solid-state battery.

The invention discloses a high-conductivity alkaline anion exchange membrane and a preparation method thereof, the high-conductivity alkaline anion exchange membrane is prepared from a rigid aromatic monomer, reactive quaternized polyarylether sulfone, immobilized quaternary ammonium salt, hydrophobic mesoporous SiO2 and a cross-linking agent, and the surface of the high-conductivity alkaline anion exchange membrane is provided with a cation density gradient transition layer and an anti-corrosion coating. The alkali-resistant stability of the membrane is improved through covalent bonding of quaternary ammonium and a three-dimensional cross-linked structure, the mesoporous SiO2 regulates swelling and constructs an ion channel, and the interface contact resistance is reduced through a gradient structure. And the OH <-> conductivity at 80 DEG C reaches 149-168 mS / cm, the 4000 h alkali-resistant retention rate is greater than or equal to 90%, the in-plane swelling rate is less than or equal to 5.1%, the interface contact resistance is as low as 0.08 omega.cm < 2 >, and the composite material has the advantages of high conductivity, low swelling, high alkali resistance and excellent interface compatibility, and is suitable for alkaline fuel cells.

This application provides an energy storage system, including: a housing; an energy storage device housed within the housing; and a voltage limiting device, wherein a first terminal of the voltage limiting device is electrically connected to the energy storage device, and a second terminal of the voltage limiting device is electrically connected to the housing or a conductive device within the housing. This system can limit overvoltage within the energy storage device's housing while reducing the risk of thermal runaway in the energy storage system.

This invention discloses an automatic switching system, method, and drive circuit for an uninterruptible power supply (UPS) in the field of power electronics. It includes a power module for providing electrical energy to the system; a relay switch unit for controlling the switching of mains power input; an accelerated turn-off unit for accelerating the turn-off of the relay switch unit; a circuit switching unit for switching a high-current drive circuit to a low-current drive circuit after a predetermined delay; and a control module for outputting a high-level signal to control the circuit switching unit to switch the high-current drive circuit to accelerate the closing of the relay switch unit, and outputting a low-level signal to control the accelerated turn-off unit to accelerate the turn-off of the relay switch unit. This invention employs a delayed switching drive design and an accelerated turn-off unit, which significantly simplifies the power supply hardware design, reduces the power requirements of the auxiliary power module, and significantly shortens the relay turn-off time, ensuring the stability and reliability of the UPS during the switching process.

The utility model relates to a kind of external heat dissipation device for light storage product, including fin, fin is connected with heat dissipation substrate, and multiple fixing holes and multiple placement grooves are equipped on heat dissipation substrate;Heat dissipation substrate edge is equipped with sealing groove;Sealing groove is installed with sealing rubber strip.By the device, heat dissipation substrate is fixed to product using screw, and double-fixed mode of sealing groove and sealing rubber strip is used, and it is convenient, stable to install and fix;It is convenient and stable to install: the fixing hole of the radiator of reasonable layout, so that the installation process of radiator on equipment is simple and easy to operate, and it is firm and reliable after installation, and can adapt to the installation needs of different types of equipment;Sealing rubber strip is placed in radiator sealing groove, and radiator is fixed in the corresponding position of product shell using screw through radiator surface mounting hole, the installation of radiator is completed, so that it is put into use for equipment heat dissipation.

This utility model relates to an integrated miniaturized air-cooled electronic chassis, including a chassis with a cubic structure open at both the front and rear ends. A front cover assembly and a rear cover assembly are respectively installed on the front and rear open surfaces, and electromagnetic shielding strips are provided in the installation gaps between the chassis and the front and rear cover assemblies. A circuit module is installed inside the chassis, and curved heat dissipation fins are installed on the top and bottom. An air inlet is provided at the rear corresponding to the heat dissipation fins. Air outlets are provided on the top and bottom of the front cover assembly. A fan assembly is installed on the rear cover assembly. This application utilizes the fan assembly, rear cover assembly, chassis, heat dissipation fins, and front cover assembly to form an effective air-cooled heat dissipation channel, which can quickly dissipate the heat generated by the circuit modules inside the chassis, greatly improving the chassis's heat dissipation efficiency. Simultaneously, the electromagnetic shielding strips effectively reduce electromagnetic interference, improve the stability of the electronic equipment inside the chassis, and ensure that the chassis can operate normally in complex electromagnetic environments.

This utility model relates to a rainfall monitoring and alarm device, belonging to the field of rainfall monitoring technology. It includes an outer detection cylinder with an open top, and an inner detection cylinder vertically arranged inside. The bottom of the inner detection cylinder has several through holes connecting the inner and outer cylinders. A detection funnel is located at the top of the inner detection cylinder, and an electrode assembly is installed inside the funnel. The electrode assembly is connected to an alarm component on the outside of the outer detection cylinder via wires. An installation hole is provided on the side wall of the inner detection cylinder above the funnel, and an overflow pipe is fixedly installed in the installation hole. One end of the overflow pipe extends into the funnel, and the other end extends to the bottom of the outer detection cylinder. This utility model, by combining a mechanical structure with electrical signals, avoids the problem of impurities easily clogging the complex structure of tipping bucket sensors, and also overcomes the defect of electronic flow meters being easily affected by environmental interference.

This utility model discloses a remote terminal port cable fixing structure, belonging to the field of remote terminal technology. This remote terminal port cable fixing structure includes a remote terminal body and a fixing component. The fixing component is disposed outside the remote terminal body and is used to fix the connection between the port and the coaxial cable connector to prevent it from falling off or loosening. The remote terminal body includes a housing, and the front of the housing has several coaxial cable ports. The fixing component includes several first fixing rings, each of which is fitted onto the outside of several coaxial cable ports. A second fixing ring is provided on the side of the first fixing ring away from the housing. First connecting seats are installed on both outer sides of the first fixing rings, and second connecting seats are installed on both outer sides of the second fixing rings. Positioning grooves are formed inside the first connecting seats near the upper and lower ends. Positioning plates are inserted into both positioning grooves, and one side of each pair of positioning plates is fixedly connected to the side of the second connecting seat near the first connecting seat.

The utility model belongs to the technical field of illumination, and relates to an underwater multispectral plant production lamp which comprises a heat dissipation column, a transparent shell, an upper cavity cover and a lower cavity cover, the heat dissipation column is hollow, a light source plate is arranged on the periphery of the heat dissipation column, and threaded connectors are further arranged at the two ends of the heat dissipation column. The transparent shell is arranged outside the heat dissipation column in a sleeving manner; the upper cavity cover and the lower cavity cover are connected to the upper end and the lower end of the heat dissipation column through the threaded connectors respectively, clamping grooves are further formed in the upper cavity cover and the lower cavity cover, and the two ends of the transparent shell are clamped in the clamping grooves of the upper cavity cover and the clamping grooves of the lower cavity cover respectively. According to the underwater lamp, the heat dissipation column is adopted as a core structure, the light source plate is installed on the periphery of the heat dissipation column, and the heat dissipation column enables light emitted by the light source plate to be irradiated at the 360-degree all-dimensional angle. The omnibearing illumination mode can ensure that all parts of underwater plants such as seaweeds in a deep water area can receive light uniformly.

The application relates to a cleaning device. The cleaning device comprises a frame, a cleaning assembly, a hand lever assembly, a water injection assembly and a switch assembly. The cleaning assembly comprises a cleaning roller which is rotatably connected to the frame. The hand lever assembly is connected to one end of the frame which is away from the cleaning assembly. The water injection assembly comprises a water tank and a hose. The water tank is mounted on the hand lever assembly. One end of the hose is connected to the water tank. The hose is partially arranged in the hand lever assembly and partially arranged in the frame, so that one end of the hose which is away from the water tank can inject water into the cleaning roller. The switch assembly is at least partially mounted on the hand lever assembly to realize the conduction or blockage of the hose.

The utility model relates to display equipment technical field especially LED packaging structure and display device, LED packaging structure includes wiring layer, with the LED chip of wiring layer electricity connection, the filling layer that sets up around LED chip, set up in the sapphire layer that LED chip far away from wiring layer one side and LED chip are pasted, LED packaging structure still includes the fluorescent layer that sets up around filling layer and sapphire layer, fluorescent layer sets up around filling layer and sapphire layer, realizes spectrum conversion, when the blue light that LED chip emits irradiates on fluorescent layer, fluorescent layer absorbs part blue light and emits other color light, and the white light that mixes with blue light is obtained to realize MIP white light product, make the light that emits from LED packaging structure more uniform, improve illumination quality and visual comfort.

The utility model provides a kind of prepayment electric energy meter with replaceable digital keyboard, it is related to electric energy meter field, prepayment electric energy meter with replaceable digital keyboard includes electric energy meter main body, installation groove is opened in electric energy meter main body, keyboard assembly is installed in installation groove, electric energy meter main body one end is hinged with cover plate one end, cover plate other end is detachably connected with the other end of electric energy meter main body, cover plate is used to limit keyboard assembly, prepayment electric energy meter with replaceable digital keyboard provided by the utility model is detachably connected by keyboard assembly and electric energy meter main body, user can conveniently and quickly replace keyboard by oneself, without replacing entire electric energy meter, greatly reduce maintenance cost and time cost, after keyboard assembly installation is completed, cover plate can be turned over, cover plate is pressed on keyboard assembly, realize the limitation of keyboard assembly.

The utility model discloses an H-shaped photovoltaic low-voltage confluence cabinet which comprises a connecting cabinet body and a frame cabinet body, the connecting cabinet body is communicated with the frame cabinet body, and the connecting cabinet body is provided with a heat dissipation device. The operation surface deviates from the connecting cabinet body, and the maintenance surface is close to the connecting cabinet body; the frame is provided with a frame circuit breaker, the frame circuit breaker is connected with the first bus copper bar group, the operation surface is provided with a molded case circuit breaker module, the molded case circuit breaker module is connected with the second bus copper bars, and the tail ends of the plurality of second bus copper bars are respectively connected with the first bus copper bar; and the first bus copper bar group and the second bus copper bar group are arranged close to the maintenance surface of the frame cabinet body. A maintenance channel with the front end and the rear end communicated is formed between the two maintenance faces. The first bus copper bar group and the second bus copper bar group are arranged close to the maintenance surface, so that heat can be prevented from being directly radiated to the operation surface, normal operation of the bus cabinet is avoided, and the problems of difficult maintenance and slow heat dissipation caused by narrow maintenance space of a traditional bus cabinet are solved.

This utility model relates to a laboratory-grade temperature-controlled photochemical reaction device, belonging to the field of photochemical reactions. It includes: a housing and a reaction vessel mechanism, multiple light source mechanisms, a cooling mechanism, and a control board, all fixedly installed within the housing. The reaction vessel mechanism is positioned above the light source mechanisms and is equipped with a temperature monitoring sensor. The cooling mechanism is connected to the reaction vessel mechanism to regulate its temperature. The light source mechanisms, the cooling mechanism, and the sensor are all electrically connected to the control board. This utility model integrates the cooling mechanism within the photochemical reaction device, which, together with the control board and the temperature monitoring sensor, facilitates the coordinated temperature control of the reaction vessel mechanism. This allows for automatic control, adjustment, and feedback of temperature parameters during the photochemical reaction experiment, reducing errors in the reaction results.

The waste heat recovery device of the hydrogen energy heavy truck comprises a shell and an internal gas cylinder, the two sides of the shell are fixedly connected with a leading-out pipeline and a leading-in pipeline respectively, a sealing structure is fixedly arranged at the top end of the shell, a limiting cavity and a heat exchange cavity are sequentially and fixedly arranged in the shell from inside to outside, and the gas cylinder is arranged in the shell. A heat exchange interlayer is embedded between the heat exchange cavity and the limiting cavity, and the guiding-out pipeline and the guiding-in pipeline are located on the upper portion and the lower portion of the two sides of the shell correspondingly and communicate with the heat exchange cavity. The effect of controlling the first sealing seat and the first sealing layer which are correspondingly connected to transversely move and adjust is achieved through the telescopic rod, and the effect of guaranteeing the sealing performance of the sealing structure from the lower position is achieved through the first sealing layer; and the second sealing seat and the second sealing layer are in contact with the corresponding first sealing seat and the first sealing layer to form embedding, so that the sealing effect between the gas cylinder and the shell is ensured.

The utility model discloses an anode baking furnace top heat preservation device with heat recovery function, including baking furnace body and the heat preservation device body of being located baking furnace body top, still include heat recovery device, heat recovery device installs heat preservation device body's top, heat recovery device includes heat collection board subassembly, heat collection board subassembly adopts high -efficient heat -conducting metal material to make, its shape is arc structure to adapt the top piece of heat preservation device top top, is equipped with a plurality of microchannels in the inside, lower surface coats high absorption rate black coating, and microchannel fills heat conducting medium. The utility model discloses through heat recovery device, realizes the efficient collection and reuse of baking furnace top heat loss, effectively promotes energy utilization, and reduces production cost.

The utility model relates to the field of motors, and discloses an optimized cooling structure of a dry-type installation submersible motor, which can improve the cooling efficiency of the dry-type installation submersible motor and solve the problem that the temperature rise of a motor bearing is too fast. Comprising a pump body, a stator, a rotor, a motor shell, a cooling jacket, a wire holder, a connecting seat and a pump cover. The end of the rotor shaft sequentially penetrates through the connecting base and the pump cover to be connected to the pump body, the stator surrounds the outer side of the rotor, the motor shell surrounds the outer side of the stator, and the two ends of the motor shell are in sealed connection with the wire holder and the connecting base respectively to form a first sealed cavity in the motor shell. The cooling jacket is sleeved outside the motor shell, and two ends of the cooling jacket are respectively connected with the wire holder and the connecting seat in a sealing manner, so that a second closed cavity is formed between the cooling jacket and the motor shell. The second end side of the rotor is provided with an axial-flow fan blade, the axial-flow fan blade rotates around the axis of the bearing to form airflow, the airflow flows to the first end side of the rotor from the second end side of the rotor and then flows back to the second end side to form circular flow, and heat exchange is conducted in the process that the airflow flows back to the second end side from the first end side.

This utility model discloses a self-cooling motor, including a housing, a rotor assembly, a stator assembly, and a fan located within the housing. The rotor assembly and the stator assembly rotate relative to each other, and the stator assembly is fixed within the housing. The fan is coaxially connected to the rotor assembly. The radial outer surface of the housing has multiple heat dissipation fins and air guide holes. The multiple heat dissipation fins are distributed circumferentially along the housing, and a heat dissipation channel is formed between adjacent heat dissipation fins. The air guide holes are located within the heat dissipation channels and are used to guide the fluid generated by the fan from the interior of the housing to the heat dissipation channels. This utility model can improve the heat dissipation efficiency inside the motor and also improve the heat dissipation efficiency on the outer surface of the motor.

The utility model discloses a protection device for measuring ferrous iron in iron ore, and relates to the technical field of experimental instruments, the protection device comprises a base, a plurality of first grooves are formed in the right side of the top end of the base, and a heating assembly is arranged in each first groove; a flask is placed in the first groove and located on one side of the heating assembly, and a position adjusting assembly is fixedly connected to the base and located on one side of the flask. By the adoption of the structure, the first groove is formed in the base, the bottom of the flask is inserted into the first groove, then the grid plate is driven by the position adjusting assembly to move, and the positioning assembly in the through hole of the grid plate makes contact with the flask, so that the position of the flask can be stabilized, the conical flask is better fixed, and the conical flask is prevented from shaking or toppling over; the stability and the safety of experimental operation are improved, and reliable guarantee is provided for a ferrous iron determination experiment.