14results about How to "Heat suppression" patented technology

The invention discloses a method for preparing a high-purity germanium ingot through reduced germanium powder vacuum melting ingot casting. The method comprises the following steps that firstly, a graphite boat is cleaned and charged; step 2, vacuumizing; 3, introducing nitrogen containing 1% of hydrogen; 4, raising the temperature, heating and melting the cast ingot; step 5, cooling is carried out; sixthly, the high-purity nitrogen continues to be introduced till the normal temperature and the normal pressure in the furnace body are recovered; and 7, discharging and taking materials. The high-purity reduced germanium powder is subjected to ingot casting in the vacuum nitrogen protective atmosphere through the high-temperature ingot casting furnace, participation of a large amount of hydrogen is avoided, the production cost and the safety risk are reduced, the production efficiency is improved, and the production cost is reduced.

The invention provides a motor control device which randomly selects a plurality of carrier frequency candidates to disperse harmonic components, suppresses the heat generation of switching elements of an inverter, and expands the dispersion of the harmonic components to suppress electromagnetic noise. A motor control device for controlling an inverter that supplies AC power to an AC motor, the motor control device being characterized by being provided with: a carrier frequency generation unit that selects each of a plurality of carrier frequency candidates at a predetermined ratio on the basis of a random number and outputs the selected carrier frequency candidates as a carrier frequency; a carrier generation unit for generating a carrier on the basis of the selected carrier frequency; and a PWM controller that outputs a PWM signal based on the carrier to an inverter, the predetermined ratio being determined based on frequencies of the plurality of carrier frequency candidates and a predetermined maximum average switching frequency.

The invention relates to the technical field of distribution boxes, and provides a distribution box with a dust isolation function, which comprises an outer box, an inner box is mounted on the front side of an inner cavity of the outer box, an air return pipe and an air outlet pipe are sequentially mounted on the left side and the right side of the inner box in a communicating manner, and a refrigeration pipe is mounted at the rear ends of the air return pipe and the air outlet pipe in a communicating manner; a rotating shaft is rotationally installed in the middle of the refrigerating pipe, a first fan blade is fixedly connected to the outer surface of the rotating shaft, and a second fan blade and a third fan blade are fixedly connected to the left end and the right end of the rotating shaft correspondingly; the middle of the outer surface of the refrigeration pipe is fixedly sleeved with a heat preservation sleeve, an inner cavity of the heat preservation sleeve is filled with heat conduction liquid, and a semiconductor refrigerator is fixedly installed on the back face of the heat preservation sleeve. The device is redesigned, the heat dissipation performance is remarkably improved, the heat dissipation efficiency of the inner box is closer to that of direct air cooling convection, and meanwhile the device achieves the efficient heat exchange function through semiconductor refrigeration on the premise that leakage of positive pressure protection gas in an inner cavity of the inner box is not damaged.

This invention provides a vehicle control device that suppresses heat generation of a wet multi-plate friction clutch when starting or driving on an uphill section. When the driving section is determined to be a flat section, the pump speed for driving the electric hydraulic pump is set to a predetermined flat section speed. Conversely, when the driving section is determined to be an uphill section, the pump speed is set to a predetermined uphill section speed higher than the flat section speed. Therefore, when driving on an uphill section, the flow rate of lubricating oil supplied to the friction clutch increases compared to when driving on a flat section, thereby facilitating the cooling of the friction clutch. Since a higher pump speed is set only on uphill sections, the operation of the electric hydraulic pump's protection control is suppressed, making it difficult to stop the electric hydraulic pump. Therefore, heat generation of the wet multi-plate friction clutch can be suppressed when starting or driving on an uphill section.

Provided are: a sheet which has high transparency, in which yellowing due to heating is suppressed, and which has high tensile elastic modulus and excellent flexibility; and a layered body having the sheet. The sheet of the present invention contains ultrafine fibrous cellulose having a fiber width of 10 nm or less, and a cellulose derivative having a weight-average molecular weight of 1.0 × 104 or more and 3.0 × 105 or less.

Provided are a nitride insulator material having low lattice thermal conductivity, a method for producing the same, a heat flow switching element, and a thermoelectric conversion element. The nitride insulator material of the present invention consists of a metal nitride represented by the general formula: M-Si-N-Te (where M represents at least one of Ta and Hf, and Te is an arbitrary element) and has a nanocrystalline structure. In addition, the heat flow switching element of the present invention includes: an N-type semiconductor layer 3; an insulator layer 4 laminated on the N-type semiconductor layer; and a P-type semiconductor layer 5 laminated on the insulator layer, wherein the insulator layer is made of the above-described nitride insulator material.

The present application provides a positive electrode active material and a preparation method thereof, a secondary battery, a battery module, a battery pack and an electric device. The positive electrode active material comprises a core, a first coating layer and a second coating layer, wherein the first coating layer is coated on the surface of the core, and the second coating layer is coated on the surface of the first coating layer. The core is LiNi x Co y A z O2, wherein A is Mn or Al, 0.6≤x<1, 0<y≤0.2, x+y+z=1, and the first coating layer is Ln x Zr 1‑x O 2‑δ , 0.08<x<0.2, 0.04<δ<0.1, wherein Ln is selected from one or more of Gd, Dy, Er, Yb, Y, the second coating layer is LiM2(PO4)3, wherein M is Ti or Zr, relative to the total weight of the positive electrode active material, the weight proportion of the first coating layer is set to A%, the thickness of the first coating layer is set to d1, unit: nm, the thickness of the second coating layer is set to d2, unit: nm, the positive electrode active material satisfies the following conditions: 0<d1 / (d1+d2+A)≤0.83, optionally, 0.3≤d1 / (d1+d2+A)≤0.6.

The invention provides a solid carbide milling cutter which is characterized in that an auxiliary chip pocket is formed in a peripheral blade front cutter face and provided with a groove face close to a peripheral blade cutting edge, and the groove face is a second front angle face, so that a peripheral blade second front angle is formed in the groove face, close to the peripheral blade cutting edge, of the auxiliary chip pocket; the second front angle of the circumferential blade is larger than the corresponding first front angle of the circumferential blade, one or more reinforcing parts are arranged in the auxiliary chip flute, the reinforcing parts are reinforcing ribs or bulges arranged on the groove surface far away from the cutting edge of the circumferential blade, so that the auxiliary chip flute is provided with a plurality of groove sections, and the width of the reinforcing parts is 0.1 mm to 5mm. According to the technical scheme, the sharpness of the cutting edge of the milling cutter can be improved, the cutting force is reduced, and the cutting performance is improved from multiple aspects of enhancing the abrasion resistance of the cutting edge, effectively cooling the cutter and cuttings, effectively controlling the size of the cuttings and the like.

The invention relates to the technical field of sapphire processing, and particularly discloses a high-precision sapphire optical wafer intelligent cutting device which comprises a processing platform, a cutting assembly is fixed to the processing platform and comprises a processing seat, and a transverse arc-shaped processing opening is formed in the middle of the side wall of the processing seat; the machining base is further provided with two first mounting grooves symmetrically formed based on the upper end and the lower end of the machining opening, first air cylinders are fixed to the bottoms of the first mounting grooves, a supporting frame is fixed to the output ends of the first air cylinders, a hollow supporting shaft is fixed to the side wall of the supporting frame, and a guide wheel is rotationally connected to the outer wall of the supporting shaft. A plurality of first through holes communicating with the interior of the guide wheel are formed in the outer wall of the supporting shaft, and a plurality of second liquid passing channels correspondingly communicating with the first through holes are formed in the inner wall of the guide wheel in a penetrating mode to the outer wall of the guide wheel along a center array. The problem that an existing sapphire optical wafer cutting device is low in cutting efficiency is solved.

The present application provides a solid carbide milling cutter, characterized in that a secondary chip groove is provided on the front cutting edge of the peripheral blade, the secondary chip groove has a groove surface close to the peripheral blade edge, which is a second front angle surface, so that the groove surface of the secondary chip groove close to the peripheral blade edge forms a second front angle of the peripheral blade, the second front angle of the peripheral blade is greater than the corresponding first front angle of the peripheral blade, and one or more reinforcement parts are provided in the secondary chip groove, the reinforcement part is a reinforcement rib or a protrusion provided on the groove surface away from the peripheral blade edge, so that the secondary chip groove has multiple groove sections, wherein the width of the reinforcement part is 0.1mm to 5mm. The technical solution of the present application can improve the sharpness of the milling cutter edge, reduce the cutting force, and improve the cutting performance from multiple aspects such as enhancing the wear resistance of the edge, effectively cooling the tool and chips, and effectively controlling the chip size.

The application discloses a kind of biological medicine efficient polypeptide flushing gel and preparation process, it is related to polypeptide flushing gel preparation technical field, first, at 20 ℃ with 550rpm stirring speed injection water is stirred, and slowly adding sodium carboxymethyl cellulose, after all is added, put into kudzu root polysaccharide, the stirring speed is promoted to 1200rpm and continues to mix 45 minutes, then reduce the speed to 300rpm, add sodium chloride and stir until dissolved, make up injection water, and adjust pH to 7.0-7.5, prepare water phase carrier, immediately cool to 2-8 ℃ for standby, then, in the independent 5 ℃ low temperature environment, freeze-dried polypeptide powder is slowly added into pre-cooled phosphate buffer according to the proportion of 1mg / mL, stirring and dissolving, prepare polypeptide mother liquor, then, polypeptide mother liquor is stirred with the above-mentioned standby water phase carrier, after mixing evenly, the final solution is filled and sealed, and finally using high-temperature steam sterilization method is handled.

The two-speed transmission apparatus for an electric vehicle comprises a planetary gear mechanism 16, a friction brake 28 and a friction clutch 26 in a coaxial arrangement between an input axis 10 and an output axis 12, the first speed is obtained by fastening the friction brake 28 and one-on-one the second speed is obtained by fastening the friction clutch 26. The electric actuator 30 to switch the first speed and the second speed comprises an electric motor 32, a torque-thrust converting mechanism 36 and a pusher 34. The torque-thrust converting mechanism 36 comprises an inside cylindrical screw 40 being rotated by the control motor 32 and an outside cylindrical nut 42 which is screwed with the cylindrical screw 40 and is connected to the pusher 34 so as to integrally axis-move. The control motor 32 may include an electromagnetic brake to fasten the friction brake 28 and the friction clutch 26. The thrust of the axial direction may be transmitted by the swing of an arm 316.

The present invention relates to a plasticizer, and discloses a flame retardant plasticizer and a preparation method and application thereof, using 1,4-dibromo-2,3-butanediol, diphenyl chlorophosphate and a paraben compound as reaction raw materials, through phosphating reaction and etherification reaction, a novel flame retardant plasticizer is prepared. The flame retardant plasticizer not only contains an alkyl long chain, but also contains a phosphate polar functional group, which can be well embedded in the molecular chain of polyvinyl chloride, increases the distance between the molecular chains of polyvinyl chloride, thereby reducing the interaction between the molecular chains of polyvinyl chloride, and plays a good plasticizing effect, and the flame retardant plasticizer contains multiple rigid aromatic ring structures, which can improve the strength and modulus of polyvinyl chloride, and show higher tensile strength and hardness, and the flame retardant plasticizer contains a bisphosphate phenyl ester flame retardant structure, so that polyvinyl chloride shows a higher limiting oxygen index and good flame retardant properties.

The utility model discloses a high-temperature protection device and audio equipment, and relates to the technical field of audio equipment protection, and the high-temperature protection device comprises a high-temperature detection module and a high-temperature protection module. The high-temperature protection module is respectively connected with the high-temperature detection module and a power amplifier of target equipment; and the high-temperature detection module is used for controlling each internal switch tube to be switched on under the condition that the temperature of the target equipment is greater than or equal to a preset temperature threshold value so as to trigger the high-temperature protection module to control a power amplifier of the target equipment to stop working. The utility model aims to prevent the service life of the audio equipment from being influenced due to over-high working temperature, so as to prolong the service life of the audio equipment.