93results about How to "Reduced eddy current loss" patented technology

The invention relates to a method for production of ferromagnetic core laminates for electrical machines. The invention likewise relates to a ferromagnetic core laminate (16). Core laminates with very thin layers of the individual electrical strips can be produced by a structure formed from layers of the electrical strips (10, 11, 12) and by the electrical strips being connected by means of a connection layer (30), in particular an adhesive layer. This makes it possible to produce cores formed from layers of core laminate for electromagnetic machines, whose eddy-losses are reduced.

The invention belongs to the field of preparation of permanent magnetic materials, and in particular relates to a high-resistivity permanent magnetic alloy and a preparing method thereof. A powder material of the alloy consists of Nd-Fe-B alloy powder and a solid surface active agent insulating layer coated on the surface of the powder, the solid surface active agent is at least one of fluorides or oxides of Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, Gd and Ho, and is 5-15% of the Nd-Fe-B alloy powder; and the grain diameter of the Nd-Fe-B alloy powder is in a micron stage of 0.5-8 microns, and the grain diameter of the solid surface active agent is in a nanometer stage of 1-100nm. According to the high-resistivity permanent magnetic alloy disclosed by the invention, the resistivity rho is larger than or equal to 1.0m omega cm, and the maximum magnetic energy product (BH) max is larger than or equal to 38MGsOe. The high-resistivity permanent magnetic alloy disclosed by the invention largely reduces vortex loss, simultaneously keeps low costs of a motor and an engine and can be applied to devices, such as high-energy-efficiency motors and high-speed generators.

The invention discloses a corrugated bracket of a fan. The corrugated bracket of the fan comprises an air guide ring, a plurality of flow guide blades and a bracket hub, wherein a motor is mounted atone side of the bracket hub; fan blades are connected to the motor through a rotating shaft and are mounted at the other side of the bracket hub. The corrugated bracket of the fan further comprises anopening expansion structure which is arranged at the end part of the air guide ring; the flow guide blades are arranged between the opening expansion structure and the bracket hub; the line of the inner wall of the opening expansion structure is inclined; corrugated noise reducing structures, comprising at least one group of wave crests and wave troughs, are arranged at the rear edges of the flowguide blades; each group of wave crests and wave troughs is arranged in the direction from the rear edges of the flow guide blades to the front edges of the flow guide blades. With the adoption of the corrugated bracket of the fan, the motor can be supported during being mounted, and moreover, the flow guide blades are corrugated, so that air output by the fan can be rectified, and as a result, the fan eddy loss is decreased, the fan efficiency is improved, and the broadband eddy noise is reduced.

The invention discloses a method for improving the efficiency of a gas drainage liquid ring vacuum pump through a macromolecular drag reduction agent, and belongs to methods for improving the efficiency of liquid ring vacuum pumps. The method comprises the steps that the quantitative macromolecular drag reduction agent is prepared and poured into a circulating pool continuously through a drag reduction agent filling machine till the optimal drag reduction concentration is reached; the gas drainage liquid ring vacuum pump is operated, and the macromolecular drag reduction agent serves as a working medium of the liquid ring vacuum pump to conduct gas drainage; and the viscosity and the liquid level of the drag reduction agent as well as the operation performance of the gas drainage liquid ring vacuum pump are monitored in real time, accordingly, the quantitative drag reduction agent is supplemented in the fixed time, and the drag reduction performance and the liquid level of the drag reduction agent are maintained. The macromolecular drag reduction agent is a polyacrylamide solution with the concentration being 0.1-0.5%. Through the method, the efficiency of the liquid ring vacuum pump can be substantially improved, operation energy consumption can be reduced, and the maintenance period and the service life of the liquid ring vacuum pump are obviously prolonged.

The invention relates to a flat-plate magnetism-gathering magnetic circuit structure used for a permanent magnet eddy current transmission device, and belongs to the technical field of permanent magnet transmission. Compared with a flat-plate permanent magnet eddy current transmission device employing a discrete magnetic circuit structure, permanent magnet material per unit mass of a flat-plate permanent magnet eddy current transmission device employing the magnetic circuit structure provided by the invention can generate larger torque or transmit higher power. The flat-plate magnetism-gathering magnetic circuit structure comprises a permanent magnet rotor and an eddy current conductor rotor which are arranged coaxially, each group of permanent magnets is composed of two to five permanent magnets which are tightly contacted with each other, each group of permanent magnets in the same magnetic coupling ring comprise the same amount of magnets, each magnet is distributed along the radial direction of the flat plate surface of a permanent magnet rotor plate, and magnetizing polarity directions of magnets in the same group of permanent magnets are identical, and magnetizing polarity directions of magnets in two adjacent groups of permanent magnets are opposite. The radial width of each vortex ring is larger than the maximum radial width of a corresponding magnetic coupling ring, i.e., the inner diameter of each vortex ring is smaller than the minimum inner diameter of the corresponding magnetic coupling ring, and the external diameter of each vortex ring is larger than the maximum external diameter of the corresponding magnetic coupling ring.

The invention relates to a three-dimensional flow centrifugal blower with a low-speed multistage vertical split cylinder structure. The three-dimensional flow centrifugal blower consists of a rotor, a stator and bearings, wherein the stator comprises a three-dimensional flow impeller, a main shaft, a sealing axle sleeve and balance discs; the stator comprises an inlet chamber, an exhaust chamber, separation discs and bearing seats; each separation disc consists of a cover disc and an impeller disc; fixing elements such as a vaneless diffuser, a curve and a backflow device are formed between the separation discs; the rotor is fixed in the stator by a thrust bearing and a support bearing mounted in the bearing seats; and the three-dimensional flow impeller comprises a first stage impeller, a middle stage impeller and a last stage impeller. The flow pass part of the blower is subjected to optimal design based on a CFD technology; a closed type integrated casting structure is adopted by the three-dimensional flow impeller; labyrinth seal structures are added on the end faces of shaft discs of the impellers; flow guide ring structures are added on the impeller inlet ends; flow guide rings and the cover discs are subjected to integrated casting; and labyrinth seal structures are added on the end faces of the balance discs. The three-dimensional flow centrifugal blower with a low-speed multistage vertical split cylinder structure has the characteristics of low cost, high efficiency, stable mechanical property and the like, and is a blower with high cost performance.

The invention relates to a subsonic rotor and/or stator blade profile of an axial turbomachine compressor, such as a turbojet. The blade has a leading edge with an S-shaped lateral profile in its mid-plane. Specifically, the profile includes, from its inner end to the outer end, a first convex portion including the foremost part of the blade, and a second concave portion including the rearmost area of the blade. This profile enables the fluid flow between 20% and 80% of the blade's length to be redistributed. This so-called 'sweep' profile increases the performance of the stage with such blades because it reduces blade tip vortex losses as well as secondary losses.

The invention discloses a high pressure resistant magnetic pump, which comprises a pump body (1), a pump cover (2), a pump shaft (3), an impeller (4), an internal magnetic rotor (5), an external magnetic rotor (6), an isolation sleeve (7), a connection frame (8), a drive shaft and a drive shaft bearing box; a spacing ring (9) is fixedly connected by a bolt through match with a spigot of the pump cover (2) in the pump body (1) so as to form the side wall of a pump cavity; an internal annular hole (90) of the spacing ring (9) forms a liquid inlet of the pump cavity; the pump cover (2) is radially provided with a liquid inlet pipe port (21); the pump cover (2) is provided with a drainage liquid inlet (24); the center of the pump shaft (3) is provided with a flow returning hole (30). Pressure borne by an inner cavity (70) of the isolation sleeve is equal to the inlet pressure of the pump, the pressure resistance of the pump is improved, a bearing device (31) of the pump shaft is totally positioned in a flowing liquid inlet medium environment, the cooling effect is good, the machining is convenient, the production cost is reduced and the service life is long.

The invention discloses a thin type cigarette machine, which comprises a box body and a fan component, wherein a flow guide plate is arranged in the box body, an air inlet is arranged on the flow guide plate, at least part of the flow guide plate in an area surrounding the air inlet is a double-sided flow guide area, a lower surface and an upper surface of the double-sided flow guide area respectively form an air inlet flow guide surface and an air outlet flow guide surface, the air inlet flow guide surface and the air outlet flow guide surface extend upwards gradually in a direction towards the air inlet; the fan component is arranged in the box body and comprises a centrifugal wind wheel and a volute, wherein the volute is arranged above the flow guide plate, the centrifugal wind wheel is arranged in the volute, an air inlet end of the fan component is arranged towards the air inlet, and air flow blown out by an air outlet end of the fan component flows through the air outlet flow guide surface. By the adoption of the thin type cigarette machine, a circumferential vortex loss is reduced, flow is optimized, an air volume loss is reduced, and the noise and the smoking effect are improved.

The invention provides a sleeve magnetism-gathering magnetic circuit structure used for a permanent magnetism eddy transmission apparatus, and belongs to the field of permanent magnetism transmission technologies. Compared with a sleeve permanent magnetism eddy transmission apparatus adopting a discrete magnetic circuit structure, a torque or the transmission power generated by permanent magnetism material per unit mass are bigger according to a sleeve permanent magnetism eddy transmission apparatus adopting the magnetic circuit structure provided by the invention. The magnetic circuit structure includes a permanent magnet rotor used as a first outer rotor and a vortex ring rotor used as a first inner rotor, each first permanent magnet set is composed of 2 to 5 magnets which tightly contact together, directions of the magnetizing magnetic polarities of magnets in the same first permanent magnet set are same, and directions of the magnetizing magnetic polarities of magnets of adjacent first permanent magnet sets are different. The magnetic circuit structure includes a vortex ring rotor used as a second outer rotor and a permanent magnet rotor used as a second inner rotor, each second permanent magnet set is composed of 2 to 5 magnets which tightly contact together, directions of magnetizing magnetic polarities of adjacent magnets in the same second permanent magnet set are same, and directions of the magnetizing magnetic polarities of adjacent second permanent magnet sets are different.

The invention discloses a twisted diffusion cylinder and an axial-flow fan applying the same. The twisted diffusion cylinder comprises a cylinder body, wherein through ventilation holes are formed in the cylinder body in the axis direction, the two ends, in the axis direction, of the cylinder body are an air inlet end and an air outlet end, and from the air inlet end to the air outlet end in the axis direction, the sectional area of the inner wall surface of the cylinder body is gradually increased in a manner of being vertical to the axis, and the cylinder body is arranged in a mode of being twisted along a coaxial spiral line. The axial-flow fan comprises a wind wheel and the cylinder body, wherein the spiral direction of the spiral line is opposite to the rotating direction of the wind wheel. The twisted diffusion cylinder and the axial-flow fan applying the same have the following beneficial effects: on the premise of not changing the original size and installation matching sizes, reverse secondary flow is generated when airflow passes through the cylinder body to weaken eddy and disturb a boundary layer on the inner wall surface, the rectification effect is enhanced, tangential airflow flowing is reduced, the flowing speed of the axial airflow is increased, the effects of pressurization, efficiency increasing, noise reduction and resistance reduction are further achieved on the basis of an original diffusion cylinder, and through experimental calculation, the efficiency is increased by 2% or above, and the noise is reduced by 2 dB (A) or above.

The invention discloses a constant-pressure vortex pump. The constant-pressure vortex pump comprises a pump body, a sealing ring, an impeller, a mechanical seal, a pump cover, a bracket and a motor. The impeller is a semi-open type structural part with the diameter D2, 8-12 main blades evenly distributed on the front face of a rear cover plate and 8-12 auxiliary blades evenly distributed on the reverse side of the rear cover plate serve as a body, and in addition, layers of front cover plates are additionally arranged at the positions of inlets of all the main blades. The suction inlet ends ofthe front cover plates are in clearance fit with the sealing ring, the external diameters d4 of the front cover plates are equal to K1D2, and K1 ranges from 0.3 to 0.4. The main blades are obliquelyarranged relative to the axis in the same direction and anticlockwise folded at the positions of the diameters D3 by one bend uniformly, the auxiliary blades are half straight strip blocks, and all the auxiliary blades are evenly distributed in the d5 circumference and radially arranged. The front cover plates have the effects of improving and stabilizing the suction capacity of the inlets of themain blades and reducing internal leakage in the structure, thus, energy losses and noise in the constant-pressure vortex pump are reduced, the hydraulic efficiency of the pump can be improved, and meanwhile generation of camel curves under the small-flow working condition is avoided.

The electromagnetic valve has a valve housing (4) enclosing a valve slider (6) contained within a housing bore (13) and a pair of electromagnets (2) for controlling the valve movement between 2 alternate end positions, the remanent magnetism holding the valve slider in the obtained end position. The valve bore within the valve housing and the valve slider are each provided with a hard surface coating of titanium nitrite, wolfram carbide, or similar. The length of the valve housing may be less than 2.5 times the outer diameter of the valve slider.