844 results about "Silicone grease" patented technology

The micro-channel liquid cooling heat dissipation device comprises a power device and a micro-channel liquid cooling heat dissipation plate, the micro-channel liquid cooling heat dissipation plate is used for dissipating heat of the power device, and the power device is attached to the surface of the micro-channel liquid cooling heat dissipation plate through heat conduction silicone grease. The micro-channel liquid cooling heat dissipation plate comprises a water inlet, a water outlet, cooling liquid, a water channel, fins and a water pump, the water channel is of a micro-channel structure and is connected with the water inlet and the water outlet, the water pump is used for driving the cooling liquid to circularly flow, the cooling liquid is injected into the water channel from the water inlet and is discharged from the water outlet, and the fins are of angle-adjustable structures and are arranged in the water channel. And the fin angle is optimized through finite element simulation. The micro fins are added in the channels, the fin angle is optimized by combining finite element simulation, the temperature uniformity between heating sources is improved, the design cost is greatly reduced on the basis of the accurate result, and finally the purposes of improving the heat transfer efficiency of the liquid cooling plate, reducing the junction temperature of a chip of a power device and improving the use reliability of the power device are achieved.

The invention provides an IGBT junction temperature prediction method and system based on dynamic thermal impedance correction. The method comprises the following steps: acquiring temperature data in real time, reversely deducing IGBT loss in combination with a pre-constructed thermal network model, and storing the IGBT loss in historical data; obtaining an IGBT loss average value under the same working condition, and calculating a difference value between the IGBT loss average value and the IGBT loss and a specific value of the IGBT loss average value to obtain a loss offset coefficient; judging whether the loss deviation coefficient is continuously greater than a preset value in a continuous period, if so, judging that the heat-conducting silicone grease is aged, calculating an aging coefficient through loss data and temperature data in the continuous period, and correcting the thermal network model by adopting the aging coefficient; and obtaining the corrected internal transient thermal impedance of the IGBT and the loss of the IGBT, and further predicting the junction temperature of the IGBT. According to the method, the thermal network model is adopted to reversely deduce the real-time loss power of the IGBT, and electric parameter drift errors are avoided; and a dynamic thermal impedance correction mechanism is introduced to ensure long-term accuracy of junction temperature prediction.

The invention belongs to the technical field of heat-conducting materials, and provides liquid metal-based composite heat-conducting silicone grease as well as a preparation method and application thereof. The modified silicone oil, the liquid metal, the heat-conducting auxiliary filler and the hydrophobic fumed silica in a specific ratio are used as main components of the liquid metal-based composite heat-conducting silicone grease, and the liquid metal-based composite heat-conducting silicone grease prepared by the invention has high heat conductivity coefficient (up to 6.05-10.0 W / mk) and low heat resistance (as low as 0.01-0.03 DEG C * cm < 2 > / W), can maintain a good appearance in double-85, high temperature 125 DEG C and temperature cycle aging tests, and has a wide application prospect. Therefore, the structure is suitable for an assembly interface of a power module and a radiator with high-power heat dissipation requirements, and the heat dissipation efficiency is improved.

The invention relates to the technical field of optical communication, in particular to an optical module cooling system which comprises a switch shell, a PCB, a socket, a radiator and a lifter, and the PCB, the socket, the radiator and the lifter are arranged in the switch shell. A cage is arranged in the switch shell; the PCB is arranged at the bottom end of the cage; the socket is arranged in the cage and is connected with the PCB; an opening is formed in the top end of the cage; the lifter is connected with the radiator so as to drive the radiator to vertically pass through the opening; and a heat-conducting silicone grease layer is arranged on the bottom surface of the radiator. The radiator is not in direct contact with the optical module, the heat-conducting silicone grease layer is filled between the radiator and the optical module, the radiator is in hard contact with the shell of the optical module through the heat-conducting silicone grease layer, a gap between abutting faces is effectively eliminated or reduced, air reserved in the gap is reduced, and therefore heat resistance between the radiator and the shell of the optical module is reduced, and the service life of the optical module is prolonged. And the heat exchange efficiency is improved.

The invention discloses a controller based on patch silicon carbide power tubes, a control circuit board and a control method. The controller comprises a plurality of patch silicon carbide power tubes, the control circuit board, an insulation pad and a shell. A pin of each patch silicon carbide power tube in the plurality of patch silicon carbide power tubes is welded on the control circuit board by adopting over-reflow soldering, and a welding point arranged on a heat dissipation surface of each patch silicon carbide power tube is welded with the control circuit board; one end of the insulating pad is attached to the bottom in the shell, and the other end of the insulating pad is coated with heat-conducting silicone grease; the control circuit board is arranged in the shell, and the heat dissipation face of each patch silicon carbide power tube abuts against the end, coated with the heat conduction silicone grease, of the insulation pad. The SMD silicon carbide power tube is adopted, so that the installation process of the controller becomes simple, the installation cost is low, and the temperature of the wafer of the SMD silicon carbide power tube can be monitored more accurately.

The invention discloses a liquid cooling plate assembly with both active heat dissipation and passive heat dissipation of a high-heat-flux chip. The method comprises the following steps: firstly, connecting a high-heat-flux chip with a boss through a spring screw, and filling heat-conducting silicone grease between the boss and the high-heat-flux chip; a flexible heat pipe is embedded in the boss, and the flexible heat pipe and the liquid cooling plate are embedded and interconnected; the boss is in heat conduction connection with the liquid cooling plate through a heat conduction pad; heat is conducted to the boss from the high-heat-flux chip through heat conduction silicone grease, the boss is conducted to the liquid cooling plate through the flexible heat pipe, the liquid cooling plate achieves export of the heat to the heat exchanger or the heat sink through an internal low-temperature working medium and the VC vapor chamber, and flexible low-heat-resistance high-heat-conduction mechanical connection of the high-heat-flux chip and the liquid cooling plate is achieved. Therefore, the impact and vibration damage of the boss to the high-heat-flux chip in a mechanical environment, especially the mechanical environment faced by satellite-borne computing equipment in the rocket ignition and carrying process, can be solved.

The invention discloses a preparation method of an ABM ceramic substrate with a metal through hole, and particularly relates to the technical field of ceramic substrates, a Si3N4 ceramic substrate is prepared through tape casting and hot pressed sintering, a conical stepped through hole is processed by using ultrafast femtosecond laser, the aperture of the through hole is 100-300 [mu] m, and the smoothness of the wall of the through hole is Rat; 1 [mu] m; performing oxygen plasma activation on the inner wall of the through hole to generate a Si-O active group; sputtering a nano titanium transition layer to enhance metal-ceramic interface bonding; the through holes are filled layer by layer through pulse electrochemical deposition, the current density is controlled, and a compact non-porous structure is achieved; in-Sn-Ag low-temperature active brazing filler metal is used, and a surface copper layer is bonded under the assistance of plasma; a fine circuit is formed through photoetching and micro-electroplating, the line width and the spacing of the circuit are the same, and the line width and the spacing of the circuit are both smaller than 20 microns; etching a micro-channel network on the back surface of the substrate by using ultraviolet laser, and filling heat-conducting silicone grease; and finally, carrying out vacuum annealing for 2 hours in an environment with the temperature of 250 DEG C.

The invention provides heat-conducting silicone grease as well as a preparation method and application thereof, and preparation raw materials of the heat-conducting silicone grease comprise the following components in parts by weight: 12-20 parts of organic silicone oil; 2-5 parts of a silane coupling agent; 0.2 to 0.5 part of a powder treating agent; 150 to 200 parts of heat conduction powder; the silane coupling agent comprises a single terminal alkoxy type silane coupling agent; the heat-conducting powder comprises a combination of zinc oxide, aluminum oxide and aluminum powder. The preparation raw materials of the heat-conducting silicone grease provided by the invention comprise the combination of the organic silicone oil, the silane coupling agent, the powder treating agent and the heat-conducting powder, and through screening and synergistic compounding of specific components, especially introduction of the specific silane coupling agent, the powder treating agent and the specific heat-conducting powder, the prepared heat-conducting silicone grease has the advantages of ultra-low heat resistance, high heat conductivity, high heat resistance, high heat resistance and the like. And the yield stress matched with the thermal resistance is realized, so that the heat dissipation capability and the operability are relatively good.

The invention provides low-migration and easy-to-coat heat-conducting silicone grease as well as a preparation method and application thereof. The heat-conducting silicone grease comprises bottle-brush-shaped polydimethylsiloxane and a heat-conducting filler. Compared with the traditional linear PDMS (Polydimethylsiloxane)-based heat-conducting silicone grease, the bottle-brush-shaped polydimethylsiloxane-based heat-conducting silicone grease disclosed by the invention has the advantages of lower oil penetration rate, lower viscosity and lower BLT.

The utility model discloses a tool structure for assembling and disassembling a cold plate. The cold plate mounting and dismounting tool structure comprises a base and a main body, the main body is placed on the base, the main body is provided with a positioning block, a grabbing assembly and a spring pressing buckle, the main body is provided with a containing cavity used for containing an SDI card cold plate and a mounting cavity of a liquid cooling connector, the spring pressing buckle is used for fixing the SDI card cold plate and the liquid cooling connector, and the grabbing assembly is used for fixing a CPU cold plate. According to the utility model, the main body is fixed on the case of the liquid cooling server, the grabbing assembly grabs the CPU cold plate, the spring pressing buckle fixes the SDI card cold plate and the liquid cooling joint, after the whole set of cold plate is fixed on the main body, the main body is taken up, the whole set of cold plate is dismounted from the case, and the main body is overturned and placed on the base so as to coat the radiator silicone grease; and then the main body is fixed on the case, and the cold plates are loaded into the case one by one, so that the whole set of cold plates can be assembled and disassembled by one person, and the operation and maintenance efficiency of the server is improved.

The invention relates to heat-conducting silicone grease with synergistic effect of modified hexagonal boron nitride and graphene nanoribbons and a preparation method of the heat-conducting silicone grease. Comprising the following steps: (1) modifying hexagonal boron nitride by using gamma-aminopropyltriethoxysilane, so as to obtain gamma-aminopropyltriethoxysilane modified hexagonal boron nitride; and (2) uniformly mixing gamma-aminopropyltriethoxysilane modified hexagonal boron nitride, graphene nanobelts and polydimethylsiloxane, carrying out ball milling, and carrying out vacuum centrifugal defoaming to obtain the heat-conducting silicone grease with the synergistic effect of the modified hexagonal boron nitride and the graphene nanobelts. Through gamma-aminopropyltriethoxysilane modification, the dispersity and interface bonding force of boron nitride in polydimethylsiloxane are improved, the problem that the hydrophilicity of boron nitride is incompatible with a matrix is effectively solved, the compatibility of boron nitride and polydimethylsiloxane is improved, a heat conduction network is effectively constructed, and the heat conduction efficiency is improved. And the graphene nanobelt and boron nitride generate a synergistic effect, so that the interface thermal resistance is greatly reduced.

The utility model discloses a TVS (Transient Voltage Suppressor) overvoltage protection device, which belongs to the technical field of diodes and comprises a packaging upper cover and a packaging bottom cover which are arranged outside a TVS tube, the packaging upper cover and the packaging bottom cover are mutually plugged and then sealed by glue, a through mounting groove is arranged at the bottom of the packaging bottom cover, and the TVS tube is arranged in the through mounting groove. A second heat conduction copper plate is installed in the penetrating installation groove, the upper end of the second heat conduction copper plate is attached to the bottom of the TVS tube, the bottom of the second heat conduction copper plate is fixedly connected with second heat dissipation fins penetrating through the penetrating installation groove, a heat dissipation assembly is installed in the packaging upper cover, and an adjusting assembly is installed on the heat dissipation assembly. The adjusting assembly adjusts the height of the heat dissipation assembly, heat is transmitted to the first heat conduction copper plate through heat conduction silicone grease arranged in the heat dissipation assembly, the heat is transmitted to the first heat dissipation fins through the multiple heat conduction copper pipes, the heat is diffused outwards through the first heat dissipation fins, and therefore sufficient heat dissipation can be conducted on the TVS tube.

The invention provides high-temperature-resistant heat-conducting silicone grease. The high-temperature-resistant heat-conducting silicone grease comprises the following components in parts by weight: 100 parts of methyl phenyl silicone oil, 300-1000 parts of modified heat-conducting powder and 0.5-3 parts of a heat-resistant additive, wherein the viscosity of the methyl phenyl silicone oil at 25 DEG C is 50-500 mPa.s, and the phenyl content of the methyl phenyl silicone oil is 25-50%. By adding the combination of the methyl phenyl silicone oil and the heat-resistant additive, molecular chain breakage of an organic silicon-based material in a high-temperature environment can be inhibited, so that the durability of the silicone grease is ensured, the service time in the high-temperature environment is longer, and the high-temperature resistance of conventional heat-conducting silicone grease is improved.

The invention discloses an active sleep cooling device, and belongs to the field of intelligent temperature control. According to the equipment, semiconductor chilling plates (20-100 W, COP > = 1.5 and delta T = 25 DEG C) are adopted to form a refrigeration module, the cold end is connected with a circulation pipeline through a buckle type water cooling head, and the hot end is coated with dynamically-adjusted heat-conducting silicone grease (the contact pressure is 0.1-0.3 MPa). The liquid cooling system (the flow is automatically adjusted along with power and temperature difference) is innovatively designed to be in redundancy fit with the air cooling system, and the hot end is less than or equal to 65 DEG C. Non-contact conduction of cooling liquid is achieved through the composite uniform temperature layer (cotton and polyurethane), and the temperature difference gradient smaller than or equal to 2 DEG C / cm is formed. Precise temperature control of + / -0.5 DEG C is achieved based on an STM32 PID control system (the parameter adjustable range Kp is equal to 0.8-1.2), and the temperature is reduced by 7 DEG C or more within 10 minutes. The safety system integrates a condensation sensor (which is triggered for 10 minutes after the humidity is greater than or equal to 70%) and a double-metal protector (cold end lt; 13 DEG C / hot end gt; 65 DEG C), via a solid state relay (in response to lt; and the double protection is realized. The power consumption of the whole machine is smaller than or equal to 120 W, the noise is smaller than or equal to 30 dB (A), the energy efficiency is improved by 50% compared with a traditional scheme, and 72-hour hydrolysis test (the strength is kept to be larger than or equal to 90%) and IP54 certification are passed. The equipment can be integrated on a mattress or a pillow or used as an independent device, is suitable for family sleep optimization, medical care and outdoor scenes, and has remarkable market application value.

The utility model provides a computer CPU radiator, and belongs to the technical field of computers. Comprising a heat dissipation fan and a heat pipe radiator fixedly connected with the heat dissipation fan, the heat pipe radiator comprises heat dissipation fins and a heat dissipation guide pipe, a heat conduction base penetrates through the middle of the heat dissipation guide pipe, a fixing fastener is connected to the top of the heat conduction base, the bottom of the heat conduction base is sleeved with a dust cover, and the dust cover is clamped to the heat conduction base; the upper end of the silicone grease coating mechanism is linked with the fixing fastener, and the lower end of the silicone grease coating mechanism is linked with the dustproof cover. The dustproof cover is arranged to cover the heat conduction seat, the dustproof effect is achieved, meanwhile, the dustproof cover is connected with the heat conduction seat in a clamped mode, it is avoided that the dustproof cover easily falls off from the heat conduction seat to affect the dustproof effect, the silicone grease coating mechanism is arranged, and the situation that an operator smears improper amount of heat conduction silicone grease is avoided; and meanwhile, quantitative heat-conducting silicone grease can be conveniently coated at the bottom of the heat-conducting seat, and the mounting efficiency is improved.

The utility model discloses a pulsed magnetic field stimulator with a temperature protection function, and relates to the technical field of medical equipment. The pulse magnetic field stimulator comprises a shell, a pulse magnetic field stimulator body, a cooling cover, a liquid tank and a refrigeration assembly, the pulse magnetic field stimulator body is fixedly installed in the shell through a support, the cooling cover is arranged outside the pulse magnetic field stimulator body in a covering mode, and heat conduction silicone grease is arranged between the cooling cover and the pulse magnetic field stimulator body. A cooling cavity for cooling liquid circulation is formed in the cooling cover, and the liquid inlet end and the liquid outlet end of the cooling liquid cavity are communicated with a liquid conveying pipe and a liquid discharging pipe through connecting nozzles respectively. The situation that the device is overheated due to long-time work is avoided, and heat on the surface of the pulsed magnetic field stimulator body is taken away through circulation of the cooling liquid.

The invention belongs to the technical field of power module assembling, and particularly discloses an automatic power module assembling system which comprises a power box feeding unit, a power module feeding unit, a transferring unit, a cover plate disassembling unit, a coating unit and a power module locking unit. The power box feeding unit is used for placing a plurality of power boxes, and the transfer unit can transfer the power boxes to the cover plate dismounting unit; the cover plate dismounting unit is used for dismounting the cover plate; the power supply module feeding unit is used for placing a plurality of power supply modules; the coating unit is used for coating heat-conducting silicone grease at the corresponding position of the power box, and the transfer unit can transfer the power module to the coating unit and place the power module in the power box; the power module locking unit is used for locking the power module. Automatic feeding of a power box and a power module, automatic dismounting of a cover plate, automatic coating of heat conduction silicone grease and automatic locking of the power module can be achieved, manual participation is reduced, and the assembling efficiency and the automation degree are improved.

The utility model relates to the technical field of optical fiber temperature measurement, in particular to a distributed temperature measurement temperature calibration device which comprises a heat preservation shell, a heating cavity is arranged in the heat preservation shell, a cylindrical heating core column is arranged in the heating cavity, a heating piece is arranged at one end of the heating core column, and a first temperature sensor is further fixedly installed on the heating core column. Two sections of calibration optical fibers are wound on the peripheral surface of the heating core column, the two ends of the temperature measuring optical fiber are connected with the two sections of calibration optical fibers respectively, one end, away from the temperature measuring optical fiber, of one section of calibration optical fiber is connected with a reference optical fiber, and a heat preservation layer used for wrapping the heating core column is arranged in the heating cavity; a heating sheet is placed at the top of an aluminum alloy heating core column, a calibration optical fiber is tightly wound on the outer wall of the heating core column, and gaps between the heating core column and the heating sheet and between the heating core column and the calibration optical fiber are filled with heat-conducting silicone grease, so that the calibration optical fiber is uniformly heated.

The invention relates to the technical field of preparation of insulating heat-conducting silicone grease, in particular to a preparation method of 10W insulating heat-conducting silicone grease. The preparation method comprises the following steps: mixing 2-phenyl-6-ethyltrimethoxysilyl-hexamethylcyclotetrasiloxane serving as a filling base material with a heat-conducting filler to form a mixture; the preparation method comprises the following steps: mixing 2-phenyl-6-ethyltrimethoxymethylsilyl-hexamethylcyclotetrasiloxane, kneading at high temperature for 30 minutes, heating the mixture until trimethoxy in the 2-phenyl-6-ethyltrimethoxymethylsilyl-hexamethylcyclotetrasiloxane on the surface of the powder is hydrolyzed to generate methanol, and volatilizing at high temperature to remove the methanol so as to reduce the viscosity of the mixture and increase the loading capacity of the heat-conducting filler. According to the invention, 2-phenyl-6-ethyltrimethoxysilyl-hexamethylcyclotetrasiloxane is used as a filling base material, and diamond, single crystal aluminum nitride, nano-zinc oxide and single crystal aluminum oxide are used as heat-conducting fillers for compounding, so that the heat-conducting material is obtained.

The invention relates to the technical field of detection circuits suitable for various electricity utilization information acquisition terminals, and discloses a detection circuit method suitable for various electricity utilization information acquisition terminals. The method comprises the following steps: setting an environment temperature, calibrating a shunt resistor and a thermistor, constructing a three-order resistance-temperature mapping relation, and calculating thermal resistance and thermal response characteristics to realize accurate modeling; a thermistor is attached to a shunt resistor, heat-conducting silicone grease is added to form a thermal coupling structure, voltage is collected through a constant current source and a differential amplifier, a resistance value is converted into temperature in real time, instantaneous current is inversely calculated based on a heat balance equation, then energy integration and grade judgment is completed, and various electrical parameter indexes are output. According to the method, modeling, collection, conversion and inversion processes are integrated, a complete thermal-electric detection link is constructed, a traditional current sensor is not needed, and the method has the advantages of being compact in structure, low in cost, flexible in deployment and the like and is suitable for a low-power-consumption distributed terminal.

The invention relates to the field of heat-conducting silicone grease, in particular to high-reliability heat-conducting silicone grease and a preparation method and application of the high-reliability heat-conducting silicone grease. The surface of the sheet-shaped heat-conducting filler is subjected to interfacial compatibility treatment; the surface of the spherical filler is provided with a reaction passivation layer for preventing the spherical filler from reacting with the organic silicon substrate; the surface of the nanoscale carbon material contains polar functional groups capable of forming a physical cross-linked network with the steric hindrance functional groups; the sheet-shaped heat-conducting filler, the spherical filler and the nanoscale carbon material are synergistically constructed to form a three-dimensional heat-conducting network. Through the three-dimensional heat conduction network constructed cooperatively, the overall heat conduction coefficient of the material is remarkably improved, and the heat dissipation requirement of a high-power-density electronic device can be met. Meanwhile, the migration of silicone oil is inhibited by utilizing a steric hindrance functional group, the side reaction of an interface is blocked by utilizing a reaction passivation layer, and the structural stability is enhanced by utilizing a physical cross-linked network, so that the oil seepage rate in a high-temperature environment is greatly reduced.

According to the invention, a polyether modified polysiloxane and polyether emulsified silicone grease composition is used as an oil phase for emulsion preparation, and hydrophilic silicon dioxide is dispersed in a polyacrylate aqueous solution at a high speed to be used as a water phase for emulsion preparation. The hydrophilic silicon dioxide is stably dispersed in a water phase in the form of fine particles due to the thickening and stabilizing effects of the polyacrylate. In emulsion preparation, the emulsion has excellent stability due to a net structure formed by hydrogen-bond interaction among hydroxyl groups on the surface of hydrophilic silicon dioxide, nanoscale polyether modified polyacrylate latex introduced by compounding in the later stage is adsorbed on the surfaces of particles in the emulsion, demulsification caused by particle aggregation is prevented, and the dispersion stability of the defoaming agent is further enhanced. Besides, the used hydrophilic white carbon black, polyacrylate and polyether modified polyacrylate almost have no influence on the clarity of the liquid detergent, and the silicone polyether emulsified silicone grease composition is combined, so that the compatibility of the silicone grease composition and the liquid detergent is increased, and meanwhile, the clarity of the liquid detergent is also ensured.

The invention relates to the technical field of organic silicon defoaming agents, in particular to an organic silicon emulsion defoaming agent and a preparation method thereof.The organic silicon emulsion defoaming agent is prepared from, by weight, 10-50 parts of silicone grease, 1-10 parts of emulsifier, 1-5 parts of thickener and 40-80 parts of dispersion medium, and the silicone grease is synthesized through reaction of silicone oil and acrylate monomers. The organic silicon emulsion defoaming agent has the characteristics of strong defoaming capability, lasting foam inhibition, high compatibility, stable chemical property, no toxicity, no odor and the like, has a very wide market application value, is particularly suitable for foam elimination of water-based ink and water-based paint, and effectively avoids the problems of needle eyes, shrinkage cavities and the like of a water-based ink paint system caused by the compatibility problem.

A case heat dissipation device having heat pipes (8) and cooling fins (7), and a case. The case heat dissipation device comprises at least one radiator (6) arranged on each circuit board (4) in the up-down direction, and comprise top and bottom radiators (6); each radiator (6) comprises a plurality of rows of cooling fins (7); a vertical angle is formed between the cooling fins (7) and the circuit board (4); the top and bottom radiators (6) sandwich the circuit board (4) therebetween and the three are locked into a whole by means of screws; the heat of a computing power unit (3) is transferred to the cooling fins (7) and is taken away by flowing air; the radiator (6) is correspondingly arranged on each column of chips (5) of the computing power unit (3); heat pipes (8) are embedded in the radiator (6); the positions between the chips (5) and the heat pipes (8) are filled with thermally conductive silicone grease to ensure sufficient connection; the heat pipes (8) and the radiator (6) are connected by means of welding; the heat pipes (8) are evenly embedded into the cooling fins (7) in rows; the cooling fins (7) and the heat pipes (8) are made of different materials; the cross section of each heat pipe (8) is convex; the heat pipes (8) embedded in the top and the bottom radiators (6) are arranged in a crisscross pattern. The heat dissipation capacity of the whole machine can be improved, and the problem of nonuniform temperature distribution of the whole machine can be solved.

The invention provides rheological heat-conducting silicone grease and a preparation method thereof. The rheological heat-conducting silicone grease is prepared from the following raw materials in parts by weight: 8 to 10 parts of polydimethylsiloxane, 100 to 104 parts of modified heat-conducting powder and 20 to 30 parts of zinc oxide, the modified heat-conducting powder is obtained by mixing a compound coupling agent and compound heat-conducting powder; the compound coupling agent is obtained by mixing a silane coupling agent and a titanate coupling agent; the compound heat-conducting powder is obtained by mixing aluminum oxide with various particle sizes, and the particle sizes are not greater than 10 microns. Aluminum oxide with the particle size not larger than 10 micrometers is mixed with the compound coupling agent to obtain the modified heat conduction powder, the interface thermal resistance of silicone grease can be reduced, and the heat conductivity and the oil leakage phenomenon are improved.

A nuclear radiation detector composed of a PMMA light guide comprises a PMMA light guide plate, a scintillator plate, an optical coupling silica gel layer and a photomultiplier, and is characterized in that the PMMA light guide plate and the scintillator plate are connected through the optical coupling silica gel layer, and the scintillator plate is arranged on the top surface of the PMMA light guide plate; an embedded groove is formed in the PMMA light guide plate; the photomultiplier is installed in the embedded groove and located on one side of the PMMA light guide plate, and an optical coupling silicone grease layer is arranged between the photomultiplier and the embedded groove; according to the device, light attenuation can be greatly reduced, far-end light collection is increased, overall consistency is improved, and alpha and beta detection efficiency is improved; the dead zone light loss can be reduced, the light collection efficiency is improved, the detection efficiency of the tail end is improved, the overall consistency is further improved, and the alpha and beta detection efficiency is further improved; according to the invention, the overall dimension of the detector assembly can be reduced, the distance from the detector assembly to the far end is also increased, the light collection efficiency is improved, and the overall consistency and the alpha-beta detection efficiency are further improved.

The present invention relates to the field of silicone grease interface materials. Provided are a high-thermal-conductivity silicone grease interface material composition, a silicone grease interface material and a preparation method therefor. On the basis of the composition of the present invention, by using a non-reactive silicone oil as a main silicone oil together with a thermal conductive powder and a special treating agent, a silicone grease interface material having both high thermal conductivity and a relatively low thermal resistance and also having relatively good aging resistance can be prepared. The composition comprises the following components in parts by weight: 1-20 parts, preferably 3-15 parts, of a non-reactive silicone oil; 60-98 parts, preferably 80-95 parts, of a thermal-conductive filler; 0.1-6 parts, preferably 1-4 parts, of a treating agent; and 0.01-1 parts, preferably 0.01-0.5 parts, of an auxiliary agent, wherein the treating agent at least comprises an asymmetric silicone oil, and optionally comprises an alkyl trimethoxy silane.

The invention discloses a motor shaft assembly, a rotor mechanism and a motor, and relates to the motor related technical field, the motor shaft assembly comprises a rotating shaft assembly, the rotating shaft assembly comprises a rotating shaft, the rotating shaft is internally provided with a liquid storage cavity for storing cooling liquid, and the inner walls of the two sides of the liquid storage cavity are fixedly connected with S-shaped inner buffer plates; a main conveying hole is formed in the outer wall of the liquid storage cavity; the cooling liquid in the liquid storage cavity can perform primary heat dissipation on the interior of the rotating shaft, then the heat conduction pipe can perform secondary heat dissipation on the surface of the rotating shaft, finally, when the temperature in the motor rises again, the air bag is heated to expand and pushes the inner push block to move rightwards, the inner push block moves rightwards, and heat conduction silicone grease can be conveyed to the surface of the heat conduction pipe. The heat-conducting silicone grease can be automatically attached to the surface of the heat-conducting pipe along with the rotation of the rotating shaft, and finally the thickness of the heat-conducting silicone grease on the surface of the heat-conducting pipe is trimmed through the trowelling plate, and the heat-conducting silicone grease is uniformly smeared, so that the heat dissipation efficiency of the rotating shaft is greatly improved.

The invention relates to the field of ultraviolet sterilization systems, in particular to an integrated ultraviolet sterilization system utilizing a UVC deep ultraviolet chip, which comprises a UVC deep ultraviolet chip lamp bead module serving as a core light source to emit deep ultraviolet light for sterilization; the self-adaptive heat dissipation module is attached to the UVC deep ultraviolet chip lamp bead module through heat conduction silicone grease and used for dynamically guiding out heat of the UVC deep ultraviolet chip lamp bead module; and the optical power closed-loop driving module is electrically connected with the UVC deep ultraviolet chip lamp bead module and is used for outputting stable current and performing feedback regulation according to optical power. According to the integrated ultraviolet sterilization system using the UVC deep ultraviolet chip, the high efficiency is remarkably improved: the NPSS + superlattice insertion layer enables the electro-optical conversion efficiency to be improved to more than 8%, and the deep ultraviolet light of 265-275 nm is 1t; the inactivation rate of escherichia coli and influenza viruses within 1 minute reaches 99.99%, and the disinfection and killing efficiency is improved by 30% compared with that of existing equipment.

The utility model relates to the technical field of thermal management, in particular to an intelligent actuator of an automobile thermal management integrated module, and aims to solve the problems that the heat dissipation effect is poor, the circuit aging is fast, the service life is shortened, the sealing performance is poor, dust and water vapor are easy to enter, the normal operation of the actuator is influenced, and the service life is shortened. The automobile thermal management integrated module intelligent actuator comprises a lower shell, an upper shell is arranged at the upper end of the lower shell, a PCBA assembly is further arranged in the lower shell, a sealing gasket used for improving the sealing performance is further arranged between the upper shell and the lower shell, a plurality of cooling fins are arranged on the upper shell, heat conduction silicone grease is arranged on the PCBA assembly, and the heat conduction silicone grease is arranged on the PCBA assembly. The heat-conducting silicone grease is in contact with the upper shell; heat dissipation can be accelerated, circuit aging can be slowed down, the service life can be prolonged, the sealing performance can be improved, dust, water vapor and other impurities are prevented from entering, and normal work of an actuator is stabilized.