111results about How to "Improve circularity" patented technology

A stator segment arranged to define a portion of an annular stator includes a core segment including a core back portion arranged to extend in a circumferential direction of the stator, and a tooth portion arranged to extend from the core back portion in a radial direction of the stator; a coil wound around the tooth portion and including a pair of coil wire terminals; an insulating layer arranged between the coil and the tooth portion; and a resin layer arranged to seal the entire coil except for the pair of coil wire terminals. Circumferential end walls of the resin layer are arranged circumferentially inward of circumferential end walls of the core back portion.

The invention provides a phenolic resin hollow bead and a preparation method and application thereof, relating to the field of plastics. The interior of the phenolic resin hollow bead is of a hollow structure, and the particle size of the bead is in a range of 5 to 100 mu m. The preparation method for the bead comprises the following steps: adding a water-soluble phenolic resin into water, carrying out stirring so as to form uniform slurry and selectively adding a foaming agent into the slurry; and subjecting the slurry to spray drying so as to allow the water-soluble phenolic resin to be cured and carrying out granulation so as to obtain the phenolic resin hollow bead. The phenolic resin hollow bead prepared in the invention has a small particle size and controllable particle size distribution and can be well applied in fields like petroleum drilling fluid; the preparation method for the bead is simple, takes a short period of time for preparation of the bead and can be easily industrialized.

The invention provides a preparation method for hollow polystyrene plastic spheres, and spheres prepared by the method, and an application of the spheres, and relates to the plastic field. The preparation method for the hollow polystyrene plastic spheres comprises the steps of dissolving an oil-phase solute in an organic solvent, adding a foaming agent, mixing uniformly to obtain an oil phase, wherein the oil-phase solute is polystyrene or a mixture of polystyrene and styrene monomers; dissolving a dispersing agent or the dispersing agent and an emulsifying agent in water to obtain a water phase; mixing the oil phase and the water phase uniformly, so as to make the oil phase dispersed uniformly in the water phase to obtain an emulsion; heating to evaporate the organic solvent while curing and foaming the oil-phase droplets; then separating a solid phase from the emulsion; and drying to obtain the hollow polystyrene plastic spheres. The hollow polystyrene plastic spheres have an internal hollow-core structure, are small in particles and controllable in particle size distribution, and can be well applied in the fields of petroleum drilling fluids, cosmetics, coatings, etc. The preparation method is simple in process and short in preparation time and can be easily industrialized.

The invention discloses non-oriented electrical steel for an ultrahigh-effect constant-frequency compressor and a preparation method of the non-oriented electrical steel. The non-oriented electrical steel for the ultrahigh-effect constant-frequency compressor comprises the following chemical components of, in percentage by weight, 1.0%-1.90% of Si, 0.20%-0.9% of Als, 0.10%-0.60% of Mn, 0.01%-0.02% of P, less than or equal to 0.01% of C, less than or equal to 0.02% of S, less than or equal to 0.02% of N, less than or equal to 0.01% of Ti, less than or equal to 100 ppm of C+S+N+Ti, and the balance Fe and inevitable impurity elements. According to the reasonable component design, the technological technologies such as hot rolling, normalizing, cold rolling, continuous annealing and the like are matched to optimize, so that the non-oriented electrical steel for the ultrahigh-effect constant-frequency compressor is obtained, which the thickness of 0.5mm, P1.0/50 is less than or equal to 3.20W/kg, B5000 is greater than or equal to 1.72T, the yield strength Rp0.2 is less than or equal to 350 MPa, and the transverse longitudinal strength difference delta Rp0.2 is less than or equal to 10 MPa.

The objective is to offer a connector component for multi-core optical fiber, or an assembly of ferrules, having high precision ferrules in concentricity, circularity, axial linearity, and spacing distance, as well as to offer a method of manufacturing the same at a reduced cost. The connector (or ferrules) is featured by its manufacturing method including thermal-spraying or electroforming is applied, using a resin or a metal, to a plurality of cylinder-shaped ferrules, under the condition that projections which are positioned opposite each other of a positioning member are fitted and nipped to both ends of insertion holes of the cylinder-shaped ferrules so that each ferrule is properly positioned and the central axes are parallel to each other at specified positions so that the plurality of cylinder-shaped ferrules are coated.

Disclosed are: a resin composition for pattern formation, which enables the stable formation of a pattern at a level of the wavelength of light; a method for forming a pattern having a sea-island structure using the composition; and a process for producing a light-emitting element that can achieve high luminous efficiency properties. The resin composition for pattern formation comprises: (a) a specific block copolymer containing an aromatic ring-containing polymer and a poly(meth)acrylate as block moieties; (b) a homopolymer of a specific aromatic ring-containing polymer; and (c) a homopolymer of a specific poly(meth)acrylate, wherein the ratio of the total amount of the aromatic ring-containing homopolymer (b) and the poly(meth)acrylate homopolymer (c) relative to the entire resin composition is 0% by weight to 90% by weight, and the total amount of an aromatic ring-containing polymer moiety contained in the block copolymer (a) as a block moiety and the aromatic ring-containing homopolymer (b) relative to the entire resin composition is 10% by weight to 60% by weight.

The invention provides a preparation method for a plastic hollow globule and the prepared plastic hollow globule and application thereof. The preparation method comprises the following steps: dissolving an oil phase solute in an organic solvent to obtain an oil phase, wherein the oil phase solute is polycarbonate or a mixture of polystyrene and/or a styrene monomer and polycarbonate; adding an emulsifier into water to obtain a first water phase; adding a dispersant or a mixture of the dispersant and the emulsifier into water to obtain a second water phase; fully emulsifying the oil phase and the first water phase to prepare a first emulsion; adding the second water phase into the first emulsion for complete emulsification so as to obtain a second emulsion and heating the second emulsion to allow the organic solvent to evaporate and an oil phase liquid drop to be cured and foamed; and carrying out liquid-solid separation, separating out a solid phase and drying the solid phase to prepare the plastic hollow globule with a hollow structure inside and an average particle size of 1 to 300 mu. The plastic hollow globule has a small and controllable particle size and can be used in fields like oil drilling fluids, cosmetics and paints.

A staring material aqueous solution containing at least Ni and Mn, an aqueous solution containing an ammonium ion donor and an alkali solution are supplied into a reaction vessel, and are mixed so as to obtain an aqueous reaction solution and to have nickel-manganese composite hydroxide particles crystallized. In this connection, the oxygen concentration in the reaction vessel is controlled to be 3.0% by volume or less, the temperature of the aqueous reaction solution is controlled to be 35-60 DEG C, and the nickel ion concentration is controlled to be 1,000 mg/L or more. Consequently, there are obtained nickel-manganese composite hydroxide particles which are represented by general formula NixMnyMt(OH)2+alpha (wherein 0.05 </= x </= 0.95, 0.05 </= y </= 0.95, 0 </= t </= 0.20, x + y + t = 1, 0 </= alpha </= 0.5 and M represents one or more elements selected from among Co, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W), and which are composed of secondary particles, each of said secondary particles being composed of a plurality of primary particles aggregated together. The average circularity of the secondary particles having particle diameters that are 70% or more of the average particle diameter is 0.82 or more, and the tap density of the nickel-manganese composite hydroxide particles is 2.20 g/cm3 or more.

The invention discloses a composite output increasing grinding aid, which is especially designed for assisting the grinding of common silicate cement, and belongs to the field of grinding assistance in cement production. The grinding aid is composed of the following raw materials: triethanolamine, triisopropanolamine, diethanolisopropanolamine, propylene glycol, glacial acetic acid, and water. The preparation method of the grinding aid comprises the following steps: washing a stirring boiler with water before the production, adding water into the stirring boiler, adding diethanolisopropanolamine, stirring until the diethanolisopropanolamine is totally dissolved; adding glacial acetic acid, stirring until the glacial acetic acid is totally dissolved; then orderly adding triethanolamine, propylene glycol, and triisopropanolamine; and finally stirring for 30 to 40 minutes so as to obtain the grinding aid. The grinding aid can improve the endurance and corrosion resistance of cement concrete products, which have the advantages of more stable volume, lower hydration heat, and better construction property. After the grinding aid is mixed into cement, the average particle size of the cement is prominently reduced, the content of fine particles is prominently increased, the particle shape is basically not changed, the roundness of the particles is increased, the repose angle is prominently reduced, and the fluidity is enhanced.

A cage-style tap-changer without excitation for transformer relates to up and down brackets and there are insulating pole of edge connecting between them. There are interval ring static state relays on the axes of insulating pole and there are dynamic relays at the up and down brackets and inside of the ring static state relays. The dynamic relays connects with one up/down gearing, and there are dynamic relays connects with closed two static state relays in the outside of dynamic relays subassembly and the corresponding ring static state relays. The beneficial effect is 1. The dynamic and static state relays touch with stabilization and short moment when switch operation moves along the axes and high orientation precision. 2. Static state relays enhance the stiffness of cage-style with strong anti-short ability of switch for large current and single-phase switch with high and insulated level.

For forming a gas breaker which effectively realizes large electric current switching-off and medium/small electric current switching-off, a heat gas jetting chamber (21) and a mechanical gas jetting chamber (32) are equipped in series. In the heat gas jetting chamber (21), a spacing component (41) is equipped. The spacing component divides the inner part of the chamber along a radial direction for dividing to an inner periphery side space (61) and an outer periphery side space (62). A switching valve (42) which is used as a gas flow control mechanism is equipped between an arc space (31) and the heat gas jetting chamber (21). A movable valve (23) is equipped for opening and closing a communication part (18) of a spacing wall (17) between the heat gas jetting chamber (21) and the mechanical gas jetting chamber (32). When the large electric current is switched off, high-temperature and high-pressure de-arcing gas which comes from the arc space (31) is blown to the arc by means of the switching valve (42) from the outer periphery side space (62) of the spacing component (41) through the inner periphery side space (61). When the medium-small current is switched off, the de-arcing gas which comes from the mechanical gas jetting chamber (32) is only guided to the inner periphery side space (61) of the spacing component and is blown to the electric arc.

The invention discloses a method for controlling the form of carbide in bearing steel. The method comprises the following steps: smelting the bearing steel in a ladle refining (LF) furnace, transferring into a vacuum degassing (VD) furnace, and smelting the changed refining slag components for 10-15 minutes under the process parameters of the temperature of 1520-1570 DEG C and the vacuum pressure of 30-100 Pa. The invention has the advantages of simple process and low cost, and has obvious effects on controlling the Mg content in the bearing steel, further controlling the form of the carbide in the bearing steel, improving the distribution of the carbide in the bearing steel and improving the circularity and length-diameter ratio of the carbide in the bearing steel.