637 results about "Silicone grease" patented technology

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 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 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 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 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 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.

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 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 invention relates to a preparation method of a polysiloxane defoaming composition. The polysiloxane defoaming composition is prepared from silicone grease, a polyether-polysiloxane copolymer, a surfactant and polyether. The silicone grease is prepared from the following raw materials: branched polysiloxane, hydrogen-containing polysiloxane, silicon dioxide, a TQ polymer, an addition catalyst and an inhibitor; the polyether-polysiloxane copolymer is prepared from hydrogen-containing silicon resin with a spatial structure, diallyl alcohol polyether and allyl polyether through a reaction. The polysiloxane defoaming agent composition obtained by the invention has the characteristics of excellent foam control and easiness in cleaning.

The invention discloses an interference elimination device for a router antenna, which relates to the technical field of routers and comprises a clamp mechanism. According to the interference elimination device for the router antenna, through the design of a clamp mechanism, in the process that a clamping plate clamps the surface of a router, a supporting rod extrudes a third spring on the inner side of a clamp shell, so that the damping and buffering effects are achieved, the clamping pressure of parts is reduced, damage to objects is avoided, and therefore the service life of the parts is prolonged; secondly, the supporting rods are contracted according to the appearance of the router, so that the supporting rods can be conveniently attached to the surface of the object, the clamping and attaching effect is improved, a certain anti-skid effect is achieved, the circular plates are made of silicone grease materials, heat conduction is enhanced, the overall heat dissipation efficiency is improved, the heat dissipation effect of equipment is kept, and the service life of the equipment is prolonged. Meanwhile, the contact area of the circular plate is small, space is reserved in the router clamping process, and the heat dissipation effect of equipment is prevented from being affected.

This utility model discloses a high-temperature resistant cooling circulation structure for a fluoroplastic magnetic pump, specifically relating to the field of magnetic pumps. It includes a base, pump body, pump cover, connecting frame, isolation sleeve, inner magnetic rotor, outer magnetic rotor, motor, and impeller. The isolation sleeve, inner magnetic rotor, and outer magnetic rotor are all housed inside the connecting frame. The high-temperature resistant cooling circulation structure of this fluoroplastic magnetic pump features a spiral cooling channel inside the isolation sleeve. The coolant flows directly through the core area of ​​the heat source, rapidly absorbing heat transferred by magnetic eddy currents and high-temperature media through forced convection, thus improving cooling efficiency and effectively blocking heat transfer to the outer magnetic rotor, preventing permanent magnets from demagnetizing and failing due to high temperatures. Copper-nickel alloy heat-conducting fins are welded to the inner wall of the isolation sleeve, combined with a layer of thermally conductive silicone grease, accelerating the conduction of heat from the inner magnetic rotor to the cooling channel. A vacuum cavity is provided between the spiral cooling channel and the outer wall of the isolation sleeve to suppress heat conduction to the outer magnetic rotor, achieving double thermal isolation.

This invention relates to the field of cable technology and discloses a safety early warning cable with temperature sensing. The cable includes a wrapping layer containing multiple insulated power wire cores, a protective layer outside the wrapping layer, a first vibration sensing element within the protective layer, and an isolation layer between the wrapping layer and the protective layer. By incorporating a spiral metal sheath within each conductor, with thermally conductive silicone grease filling the space between the sheath's inner wall and the temperature-sensing optical fiber, rapid and direct monitoring of the conductor's core temperature is achieved. Simultaneously, heat is transferred through the conductor's copper wires in the spiral microgrooves, the thermally conductive metal strip on the surface of the insulation layer, and the thermally conductive material in the filling layer to the multimode optical fiber core in the multi-core sensing cable, forming redundant temperature measurement channels. When the temperature of a conductor is abnormal, the corresponding temperature-sensing optical fiber and the multimode optical fiber core can be cross-verified, effectively avoiding false alarms caused by single-point faults or poor local contact, significantly improving temperature measurement reliability and response speed.

The utility model discloses a power device heat-conducting silicone grease smearing tool, which belongs to the technical field of power device production auxiliary equipment and comprises a mounting box body, a fixing plate fixedly mounted at the top of the mounting box body, a power device body arranged at the top of the fixing plate, and a turntable rotatably mounted at the bottom of the fixing plate. Four groups of moving plates are slidably mounted in the fixed plate, connecting plates are fixedly mounted at the tops of the four groups of moving plates, clamps are fixedly mounted on one sides of the four groups of connecting plates, and supporting rods II are fixedly mounted at the bottoms of the four groups of moving plates, so that self-centering clamping of four surfaces of the power device body is realized; the multi-direction clamping mode can stably fix the power device from all angles, no matter how the initial placement position of the power device is, the power device can be automatically adjusted to the center position of the tool and is firmly fixed, the conditions of deviation, shaking and the like of the power device in the heat-conducting silicone grease smearing process are effectively avoided, and the working efficiency is improved. And the smearing operation can be stably carried out.

The invention discloses a preparation method and application of a graphite flake diamond complex. The preparation method comprises the following steps: mixing diamond micro-powder, crystalline flake graphite, copper powder, sodium chloride, potassium chloride and titanium powder according to a certain proportion, co-firing at 880-1050 DEG C for 30-60 minutes, cooling, taking out a mixed co-fired sample, and fully cleaning with deionized water to obtain the graphite flake diamond complex (GD); mixing GD, a silane coupling agent and absolute ethyl alcohol according to a certain proportion, magnetically stirring for 60-120 minutes at the temperature of 60-80 DEG C, and preserving heat for 6-12 hours at the temperature of 100-200 DEG C to obtain a silane coupling agent surface modified graphite flake diamond complex (GDSM); and then, uniformly mixing the GDSM and dimethyl silicone oil according to a certain proportion, putting the mixture into a vacuum drying oven, carrying out vacuum-pumping heat preservation at 80-120 DEG C for 120-360 minutes, cooling to room temperature, and taking out to obtain the graphite flake diamond composite heat-conducting silicone grease which can be applied to the field of interface heat management of high-power devices.

The invention discloses a pulse tube refrigeration device based on a semiconductor refrigeration ring. The device comprises a compressor, a precooler, a heat regenerator, a cold-end heat exchanger, a pulse tube, a hot-end heat exchanger, a reducing cavity, an adjusting tube and an air reservoir which are communicated in sequence. The semiconductor refrigeration sleeve is arranged outside the heat regenerator, and the surfaces of the semiconductor refrigeration sleeve and the heat regenerator are tightly attached. The semiconductor refrigeration sleeve is formed by overlapping a plurality of annular semiconductor refrigeration sheets, the hot surface of each semiconductor refrigeration sheet faces upwards, the cold surface of each semiconductor refrigeration sheet faces downwards, and the cold and hot surfaces of every two adjacent semiconductor refrigeration sheets are connected through heat-conducting silicone grease. Temperature sensors are arranged at the top and the bottom of the semiconductor refrigeration sleeve to monitor the temperature difference in real time, and the control system adjusts the input current of the semiconductor refrigeration piece and adjusts the refrigeration power of the semiconductor refrigeration piece. Through the stacked structure of the semiconductor refrigeration rings, step-by-step reduction of the temperature is achieved, the cooling efficiency is remarkably improved, and accurate temperature control can be conducted. The device is compact in structure, high in reliability and suitable for the working environment with the high requirement for equipment stability.

The present invention discloses a highly thixotropic, low thermal resistance and ultra-long life thermal conductive silicone grease and its preparation method. By the compatibility of silicone oils with different degrees of branching and different end groups, a compound silicone oil with higher wettability and lubricity is obtained, reducing the friction between powders and increasing the powder filling rate; by adding nano-ABS microsphere powders, on the one hand, the thixotropy of the material is improved, and on the other hand, the high-temperature stability and shape retention ability of the thermal conductive silicone grease are improved by utilizing the characteristics of high-temperature softening and swelling of ABS at high temperatures; by adding Ce element to the Al matrix, due to the low electronegativity of Ce, more metals are provided for Al, increasing the electron density of the conduction band; at the same time, the addition of Ce can modulate the electronic structure of Al, further expanding the s-band and p-band of Al, improving the mobility of conduction band electrons, so that AlCe has a higher thermal conductivity than pure Al.

The utility model relates to the technical field of linear motors, and discloses a cooling structure of a linear motor mover, which comprises a linear motor mover body, a linear motor stator is arranged at the bottom of the linear motor mover body, a cooling box is arranged at the top of the linear motor mover body, and a ventilation pipe is arranged on the outer side of the cooling box. And cooling fins are fixedly mounted in the ventilation pipes. According to the cooling structure of the linear motor rotor, through the design of the cooling fins, the contact area with air is increased, the heat dissipation performance is improved, through the design of the multiple cooling fins, the overall heat dissipation performance is further improved, through the design of the first flow guide plate and the second flow guide plate, the contact area between cooling liquid and the cooling box is increased, and the cooling efficiency is improved. The time of cooling liquid in the cooling box is prolonged, the overall heat dissipation performance is improved, through the design of heat dissipation silicone grease, the overall heat dissipation performance is improved, and through the design of the installation frame, installation of other parts of the linear motor is facilitated.

The invention relates to the technical field of controllers, and discloses a controller assembly of an electric motorcycle, which comprises an aluminum substrate, the electrical function module comprises a power board, a capacitor board and a driving board, an electrode assembly is arranged on the capacitor board, a three-phase aluminum column is arranged on the surface of the power board, and the driving board penetrates through the three-phase aluminum column to be connected with the power board; the heat dissipation module comprises a waterproof cover, the waterproof cover penetrates through the three-phase aluminum column to be fixedly connected with the aluminum substrate, waterproof rings are arranged on the upper side and the lower side of the waterproof cover, an annular waterproof piece is arranged on one side face of the waterproof cover, and a cable penetrates through the waterproof piece to be electrically connected with the three-phase aluminum column. Through the fixed connection design of the aluminum substrate, the power board and the capacitor board and the combination of the structure that the bottom of the power board is attached to the aluminum substrate through the heat conduction silicone grease, large-area efficient heat dissipation is achieved, and heat accumulation generated when the controller operates at high power is remarkably reduced.

The invention discloses a droplet nanometer friction / photo-thermoelectric hybrid power generation device and a preparation method thereof. The hybrid power generation device comprises a liquid drop power generator part and a photo-thermal power generator part, wherein the liquid drop power generator part is mainly formed by integrating a capacitor and liquid drop friction power generation, and the photo-thermal power generator part is mainly composed of a temperature difference semiconductor. The preparation method of the device mainly comprises the following steps: carrying out surface treatment on a zinc sheet, so that a layer of candle ash is uniformly attached to the surface of the zinc sheet to obtain the treated zinc sheet; uniformly coating a layer of polydimethylsiloxane (PDMS) on the surface of the candle ash, and heating in an oven for two hours for curing and forming; fixing a copper electrode on the surface of the PDMS, and welding a lead on the copper electrode and the zinc sheet; the temperature difference semiconductor and the zinc sheet are combined together through heat-conducting silicone grease; a radiation cooling plate is attached to the cold end of the temperature difference semiconductor; and wires are respectively welded at the hot end and the cold end of the temperature difference semiconductor. The droplet nanometer friction / photo-thermoelectric hybrid power generation device provided by the invention is simple in structure and convenient to manufacture, can continuously and stably output direct current voltage without depending on single weather, and has a wide application prospect.