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785results about How to "Reduce temperature rise" patented technology

High heat-conductivity epoxy casting material for dry power transformer and preparation method thereof

The invention discloses a high heat-conductivity epoxy casting material for a dry power transformer and a preparation method thereof. Instead of silicon powder used in the prior art, the high heat-conductivity inorganic powder is used as padding, so that the coefficient of heat conductivity of the casting material is increased. The invention is characterized in that: 1) a toughening agent with higher hydroxyl content is selected, so that the impact resistance and the toughness of cured matters are improved while the acting force between the inorganic powder and the substrate resin molecules is increased; and 2) the formula of the casting material and the technical measures, such as a rubber mixing and de-foaming technology, are optimized, so that the easily sinking phenomenon of the high heat-conductivity inorganic powder caused by higher density is eliminated. The coefficient of heat conductivity of the obtained high heat-conductivity epoxy casting material can reach 1.1-1.3W/(m K); the impact resistance can reach 14-22kJ/m<2>; the difference between the density of the upper part of a workpiece and the density of the lower part of the workpiece is not more than +/-0.5%; the bending strength is 120-140MPa; the coefficient of linear expansion is 30-50*10<-6>K<-1>; the thermal deformation temperature is 105-120 DEG C; and the breakdown field strength is 26-30kV/mm.
Owner:GUILIN UNIVERSITY OF TECHNOLOGY

Rotor of built-in permanent magnet motor and magnetic steel structural parameter determining method thereof

The invention relates to a rotor of a high-quality and high-speed built-in permanent magnet motor and a magnetic steel structural parameter determining method thereof. In the invention, the whole section magnetic steel of each electrode of the rotor of a conventional built-in permanent magnet motor is divided into multiple sections of magnetic steel which have the same polarity and different widths; the multiple sections of the magnetic steel are respectively arranged in a rotor core; and reinforcing ribs with the function of magnetic isolation are arranged among the multiple sections of the magnetic steel. By reasonably modulating and determining the width and distribution of each section of the magnetic steel, the air gap magnetic density waveform approaches sine distribution; harmonic components are reduced to the greatest extent; the eddy current loss of the magnetic steel and the torque pulsation of the motor are simultaneously reduced; and the electromagnetic performance of the motor is enhanced. Furthermore, the multiple sections of the magnetic steel are arranged in the circumference along the rotor; the highest rotating speed of the safe operation of the rotor is greatly enhanced on machinery; the radial thickness which is needed by the magnetic circuit of the rotor is obviously reduced on the structure; the rotational inertia and weight of the rotor are reduced; the dynamic response of the motor is improved; and the requirements of a high-speed driving system on the performance of the motor are met.
Owner:SHANGHAI UNIV

Energy saver for AC contactor

The invention discloses an energy saver for an AC contactor, which comprises a half-wave rectification circuit, a square-wave generation circuit, a DC voltage-regulated power supply circuit, a signal converter and a charge/discharge circuit. The half-wave rectification circuit is used for half-wave rectification of mains power, the square-wave generation circuit is used for providing square-wave input for the signal converter, the DC voltage-regulated power supply circuit is used for providing a stable DC power supply for the signal converter, the signal output end of the signal converter is used for providing a control signal for the charge/discharge circuit, and the load of the charge/discharge circuit is an AC contactor. The current of the coil of the AC contactor can be changed through changing the pulse width of the output end of the signal converter, thereby realizing that the high current can flow through the coil of the AC contactor when the contacts of the AC contactor are closed, and the low current can flow through the coil of the AC contactor when the closed state of the contacts of the AC contactor is maintained. Therefore, the invention realizes the energy-saving operation of the AC contactor, reduces the noise and the temperature rise of the coil of the AC contactor, and prolongs the service life of the AC contactor.
Owner:ZHEJIANG UNIV

Copper bus bar with high strength, high conductivity and high toughness and preparation method thereof

The invention relates to a copper bus bar with high strength, high conductivity and high toughness and a preparation method thereof. The copper bus bar is characterized in that the material comprises 99.96-99.998% of copper and silver, 0.002-0.02% of yttrium rare earth and 0-0.038% of impurities, wherein silver accounts for 0.0005-0.01% of copper and silver; and the copper master alloy containing the yttrium rare earth is used as a modifier. The preparation method comprises the following steps: (1) melting a copper material: heating the cathode copper in a mains frequency core induction furnace to melt the cathode copper into liquid cathode copper; (2) modifying liquid copper: melting the modifier in the liquid cathode copper and fully mixing the modifier with the liquid cathode copper; (3) drawing a continuously cast copper bar upwards: causing a crystallizer of a continuous casting machine to stretch into the liquid cathode copper, condensing the liquid cathode copper into the copper bar in the crystallizer and drawing the copper bar upwards by means of two pairs of drawing roll mechanisms in the continuous casting machine to lead the copper bar to a take-up machine via a wheel frame; (4) continuously extruding the copper bar at medium temperature and carrying out anti-oxidation cooling; and (5) carrying out draw forming: putting copper bus bar blanks on a drawing machine, carrying out draw forming on the copper bus bar blanks.
Owner:福州市广福有色金属制品有限公司

Oil immersion type water proof diving pump

The present invention relates to an oil-immersed waterproof submerged pump. A rotor and a stator coil wound with waterproof wires are arranged in the housing cavity of a submerged motor; insulating oil is used as the cooling medium of the housing cavity; a rear bearing and a bearing cover are mounted on the rear end of a motor shaft; a lead-out wire tube, which can lead out a lead-out wire, is mounted on a base; a housing, the base and a front cover close the housing cavity; a front bearing and a mechanical seal, which are fastened in the central hole of the front cover, are mounted in the middle part of the motor shaft; water fills up a sealing chamber; a submerged pump vane wheel is mounted on the front end of the motor shaft; a pump seat is mounted on the front end of the sealing chamber; a pump cover is mounted on the front end of the pump seat; the pump cover is provided with a water inlet; a filtering net is mounted on the front end of the pump cover; a water outlet is arranged on a submerged pump body. The oil-immersed waterproof submerged pump has the advantages that: the temperature raise of the motor is reduced, and the power of the motor is increased; the service life of the motor is increased; the service life of a bearing is prolonged; water source is prevented from being polluted; the oil-immersed waterproof submerged pump can be used in dirty water.
Owner:TIANJIN GANQUAN GROUP

Coal tar hydrogenation system and coal tar hydrogenation method

The invention provides a coal tar hydrogenation system and a coal tar hydrogenation method. The method comprises a hydrogenation refining reactor, a separation unit and a hydrogenation cracking reactor, wherein the hydrogenation refining reactor is an up-flow fixed bed reactor, the hydrogenation cracking reactor is a down-flow fixed bed reactor, and the separation unit is a middle liquid separation tank; gas-liquid separation is performed on raw oil and hydrogen after a hydrogenation refining reaction, a part of liquid-phase heavy fractions is separated, one path is used as circulating oil and returned to perform the hydrogenation refining reaction again, and the other path is used as quenching oil after being cooled and added between catalyst bed layers for the hydrogenation refining reaction to play a role of cooling; and the other part of the liquid-phase heavy fractions is used as refined generated oil and mixed with hydrogen to perform a hydrogenation cracking reaction, and the obtained reaction product is combined with gas-phase light fractions after the gas-liquid separation to form the final product. The system and the method provided by the invention are low in equipment cost, simple to operate, capable of prolonging the life of the catalysts of the hydrogenation refining reactor and the hydrogenation cracking reactor, and suitable for raw oil with worse conditions.
Owner:CHINA PETROCHEMICAL CORP +1

Manganese zinc ferrite with characteristics of high temperature, low power consumption and high overlaying, and preparation method thereof

The invention discloses a manganese zinc ferrite with characteristics of high temperature, low power consumption and high overlaying, and a preparation method of the manganese zinc ferrite. The manganese zinc ferrite comprises ferric oxide, manganese oxide, zinc oxide, calcium carbonate, titanium oxide, cobaltous oxide, silicon oxide, chromic oxide, niobium oxide and vanadium oxide. The manganese zinc ferrite is prepared through the steps of material blending, preburning and crashing, sanding, preparation of granulation slurry, spray granulation, manufacturing of blanks, sintering and the like, and under the test condition of 100KHz 200mT, the power loss at the temperature of 100 DEG C is smaller than 260kw/m<3>, and the Bs at the temperature of 100 DEG C is larger than 420mT; a filter, a switch power source and a transformer application electronic product are partially made of magnetic materials, partial energy is consumed, and an electronic device which is wider in use field, smaller in size, more efficient and saving in energy can be provided for users, the use frequency of the materials is expanded, the loss is reduced, performance of components with magnetic cores applied can be improved largely, electronic products are made to be smaller and more efficient, and effective help is provided for adjustment of the national industrial structure, energy conservation and emission reduction.
Owner:SUZHOU GUANDA MAGNET
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