145results about How to "Eliminate vortex" patented technology

The present invention provides a frequency converter for driving a motor, comprising: a circuit board, having at least one first heat-generating element mounted thereon; a heat sink, connected to the at least one first heat-generating element; a fan, facing the heat sink; and a bracket, for positioning the at least one heat-generating element relative to the heat sink and the circuit board. The frequency converter further comprises: a separating member for separating the at least one portion of the main body of the at least one second heat-generating element from the circuit board, so as to prevent the cooling air guided to the at least one second heat-generating element from flowing to the circuit board; an airflow guiding member placed between the fan and the heat sink, for guiding the cooling air flowed from the fan to the heat sink and the at least one second heat-generating element respectively; and a flow guiding gate guiding the airflow from the fan to the heat sink, and dispensing more airflow to flow through the region corresponding to the at least one first heat-generating element.

The invention relates to a method for actively shimming first order of a main magnet in a nuclear magnetic resonance measurement (NMR) system and a magnetic resonance imaging (MRI) system. The method comprises the steps of carrying out shimming on three directions orthogonalized in space, using echo deflection time as measurement of first order nonhomogeneity of a main magnetic field, using a linear relationship between difference of two echo deflection times and the first order nonhomogeneity gradient under a certain approximate condition so as to determine the first order nonhomogeneity gradient of the main magnetic field, changing absolute measurement to relative measurement, transforming calculation of determining the nonhomogeneity of the main magnetic field according to the phase position from calculation of determining the nonhomogeneity of the main magnetic field according to time through the Fourier transformation on the echo, and using slope of a straight line after multimetering linear fitting to replace calculation on single-point data. Meanwhile, the method can acquire quantitative data of vortex to provide solution for eliminating the vortex. The method remarkably improves the measurement precision, reduces number of iterations, accelerates shimming, and can be used for any magnet in NMR and MRI system.

The objective of this invention is to obtain rotor blades for large-sized horizontal axis wind turbines that allow easy transport, handling and storage at the same time guaranteeing greater efficiency in the use of wind energy. The present invention results in a blade (4) made up of two or more elements (5,6,9) arranged collaterally and preferably fixed among themselves such as to cause an aerodynamic interference between said elements.

The invention relates to a strong loop quick cooling chamber, comprising a wind cooling chamber which is composed by a outer shell, a feed port and a discharge port are arranged on the both ends of the wind cooling chamber, a horizontal production line is arranged between the feed port and the discharge port, a plurality of upcast ventilation pipes and downcast ventilation pipes are arranged inside the wind cooling chamber. The upcast ventilation pipes and downcast ventilation pipes are separately arranged at the upper side and the lower side of the horizontal production line, a plurality of top nozzles which can jet air down are arranged on the upcast ventilation pipes, a plurality of lower nozzles which can jet air up are arranged on the downcast ventilation pipes, a gas circulator is arranged in the wind cooling chamber, an air inlet opening of the gas circulator is communicated with the wind cooling chamber, an air outlet opening of the gas circulator is communicated with the interior of the upcast ventilation pipes and downcast ventilation pipes, a built-in heat exchanger is arranged at the air inlet opening of the gas circulator. By arranging ventilation pipes on the upward side and lower side of the horizontal production line, strong convection can be formed by the cold air which is jeted from the nozzles of the upcast ventilation pipes and the downcast ventilation pipes and the heat on the devices can be quickly removed.

The invention discloses a design method for a nonadjustable axial flow pump impeller with the characteristic of long blades and short blades. The method specially comprises the following steps that three-dimensional blade profiles of the long blades of the nonadjustable axial flow pump impeller are designed according to a streamline method; three-dimensional blade profiles of the short blades of the nonadjustable axial flow pump impeller are designed according to parameters of the designed three-dimensional blade profiles of the long blades; the designed short blades are arranged in the middles of flow channels formed by every two adjacent long blades at intervals, and the nonadjustable axial flow pump impeller with the characteristic of the long blades and the short blades is obtained. The problem of unstable fluid conveying caused by flow separation and swirling flow at the intersection of the suction surfaces of blades and a wheel hub near an outlet of an axial flow pump impeller during operation of the axial flow pump impeller is solved.

The invention discloses a cross bionic blade combining a carangidae fish body and a pinion and a preparation method of the cross bionic blade, and the cross bionic blade is used for a multi-blade centrifugal fan. The cross bionic blade comprises a blade body. The cross section of the blade body has a carangidae-fish-cross-section-contour-imitation appearance, the mean camber line of the blade bodycross section is in a single arc shape, and the circle center position, the circular arc radius and the circular arc central angle of the mean camber line of the blade body cross section are determined according to a forward-bent blade profile design method of the multi-blade centrifugal fan. The end face, facing the impeller sucking-in side, of the blade body is of a wave-shaped structure, and the end face, facing the impelling blowing-out side, of the blade body is of a saw-tooth-shaped structure. The blade can improve the flowing of airflow in the impeller on the premise of increasing theair volume, the pressure fluctuation on the surface of the blade is lowered, and the aerodynamic noise is lowered.

The invention disclose a novel low-resistance square elbow comprising a first inner arc surface, a second inner arc surface, an outer arc surface and two sides, wherein the first inner arc surface is connected with the second inner arc surface; the first inner arc surface, the second inner arc surface and the outer arc surface are respectively connected with the two sides to form a rectangular channel; the radius and the arc length of the first inner arc surface are more than the radius and the arc length of the outer arc surface; the radius and the arc length of the outer arc surface are more than radius and the arc length of the second inner arc surface; and circle centers of the first inner arc surface and the second inner arc surface are respectively arranged on elongated surfaces of an inlet section and an outlet section. Because of the specific design of the elbow, the novel low-resistance square elbow simultaneously eliminates a volution region generated by passing through the inner arc surfaces of the elbow by the fluid and a volution region generated at a joint part of the elbow and a straight pipe so as to finally achieve the effect of reducing the resistance when the fluid passes through the elbow.

The invention discloses a sendust magnetic powder core. Magnetic powder adopted for the sendust magnetic powder core comprises, by weight, 9-10% of Si, 5-6% of Al, and the balance Fe. Based on the ratio, the sendust magnetic powder core is prepared through powder pre-annealing, screening, passivation, insulation coating, compression moulding forming and heat treatment. According to the sendust magnetic powder core, the sendust magnetic powder core preparing technology is optimized, each preparation step is controlled, and excellent comprehensive performance is realized through the cooperation of all the steps.

The invention discloses a double-circulation ventilation cabinet of an auxiliary transformer for a locomotive. The double-circulation ventilation cabinet comprises a cabinet body, a cabinet top fan and the transformer, and further comprises a clapboard structure, a cyclone dust remover, a dust removal box, a dust exhaust air duct and a heat dissipation fan of the auxiliary transformer, wherein the clapboard structure comprises an inclined plate, a horizontal plate and a vertical plate; one end of the inclined plate is connected with the interior of the cabinet body, and the other end of the inclined plate is connected with one end of the horizontal plate; the angle formed by the inclined plate and the horizontal plate is 130-160 degrees; the other end of the horizontal plate is connected with the dust removal box; one end of the vertical plate is connected with the inclined plate, and the other end of the vertical plate clings to the transformer; the cyclone dust remover and the heat dissipation fan of the auxiliary transformer are arranged at the inner side of the cabinet body; the cyclone dust remover and the dust removal box are both communicated with the dust exhaust air duct. The double-circulation ventilation cabinet disclosed by the invention greatly improves the working environment of the auxiliary transformer, and thoroughly solves the grounding faults of the auxiliary transformer, due to water inlet and dust inlet.

The invention discloses a strong wind cooling system for medium plate heat treatment, which comprises a cooling air supply system and a control system; a steel plate is performed with strong wind cooling in a cooling chamber arranged along a conveying roller way, a plurality of cooling segments are held in the cooling chamber, each cooling segment is provided with an air supply system and a heat exchanger, and the cooling and cooling air circulation of the steel plate at the cooling segment are controlled by a process control system; the control mode of the conveying roller way comprises single transmission and group frequency conversion; the control system is composed of a transmission instrument system, a PLC system and a process control system; the process control system is used for dispatching a model parameter database according to a production plan, regulating a strong wind cooling strategy by a created strong wind cooling mathematical model, calculating a strong wind cooling procedure, and sending the cooling procedure to the PLC system to be executed and displayed on an interface; the process control system triggers the PLC to work by an inlet metal detector signal, and the PLC system is used for respectively executing the working procedures of the air supply system and the roller way system. The system disclosed by the invention has the advantages of improving the production efficiency and simplifies the operation steps.

The invention relates to a low noise axial fan with rotating flow guide ring, comprising electric machine, vane, machine casing, bracket and wheel hub, where the wheel hub is arranged at the lower part of the machine casing, the electric machine is arranged above the wheel hub and coaxially connected with the wheel hub and fixed on the inner surface of the machine casing, the section of the bracket is streamlined, the vane is of an integral fixed vane angle profile and of a forward-swept shape, wide outside and narrow inside, and these vanes are not equidistantly arranged, and the link line of gravity centers of various sections of the vane forms an included angle <=30 deg. with its radial straight line. The lower inlet end of the machine casing is provided with rotating flow guide ring rotating with the vanes, the upper cylinder body of the flow guide ring is integrated with the vane circumference, and keeps a rotating gap from the inner diameter of the machine casing, a bottom circular arc flow guide ring is of a 1 / 4 ellipse in shape, and the lower annular end surface of the machine casing is arranged in the flow guide ring and forms an axial gap from a platform in the flow guide ring to be good for relatively rotating. The invention has remarkable noise-reducing and energy-saving effects.

A blade wheel for centrifugal pump (or blower) is composed of hub, webs and two or more blades consisting of the primary and secondary blades, which are overlapped at the small radium position and connected by a sealing plate at the maximal radium position. Its advantages are high efficiency and low energy consumption.

The invention discloses a multi-blades centrifugal fan and a group design method thereof. The multi-blades centrifugal fan comprises a volute shell, a blade wheel and a volute tongue arranged in the volute shell, and a collecting ring arranged on the side of the volute shell. The blade wheel comprises a wheel disc, a wheel cap, and a blade. The blade is double circular arc form, and an inlet incidence angel beta 1of the blade is 75 degrees-90 degrees, an outlet incidence angel beta 2 of the blade is160 degrees-180 degrees. The inlet and outlet radius of the blade are 160 mm and 202 mm respectively. The connected position of the two circular arcs Rf is 180 mm-195 mm, and an incidence angel beta f of the two circular arcs is 90 degrees-120 degrees. The volute shell is formed by the connection of four smooth circular slices which center on the four angles of an equal base side. The ratio of the width of the volute shell, the width of the collector, and the axial length of the impeller is 1.31:0.26:1. The volute tongue is a bionic structure based on a leading edge profile line of a long-eared owl airfoil type. The design method of the multi-blades centrifugal fan is that the blade, the volute shell, and the volute tongue are orderly improved designed in groups. The multi-blades centrifugal fan has the advantages that the flow separation degree can be reduced, the efficiency is increased, the pneumatic property is improved obviously, the design method enable to reduce calculated amount and is higher in reliability.

The present invention relates to controlled airflow and air distribution within a laboratory safety enclosure and in particular, to turbulence-free airflow within a laboratory fume hood. The fume hood of the present invention has a work chamber and an access opening having an upper edge. A horizontal air deflector structure is positioned adjacent to the upper edge of the access opening to divert a portion of air entering the access opening upwardly within the chamber, whereby the diverted air eliminates an airflow eddy current.

The invention discloses a cooling triangle unit provided with a flow equalizing device with a middle jet gap, which comprises a cooling triangle unit and a flow equalizing device with a middle jet gap, and the cooling triangle unit comprises a left side cooling column, a right side cooling column and an air inlet shutter, the flow equalizing device with the middle jet flow gap comprises an outer flow equalizing plate, an inner flow equalizing plate and the middle jet flow gap, the outer flow equalizing plate extends inwards by a certain distance Lw from the air inlet louver along the vertical central symmetry face of the cooling triangle, and the inner flow equalizing plate extends inwards by a certain distance Ln from the position with the distance Lj from the inner end of the outer flow equalizing plate along the vertical central symmetry face of the cooling triangle. The inner end of the outer side flow equalizing plate and the outer end of the inner side flow equalizing plate form a jet flow gap. Based on the middle jet flow gap, on the basis of equally dividing the inlet air of the cooling triangle, vortex induced by air entering the tower on the leeward side of the flow equalizing device is eliminated through jet flow formed by the middle jet flow gap, and then the cooling performance of the cooling columns on the left side and the right side of the cooling triangle unit and the overall cooling performance are improved.

An exhaust hood for an axial steam turbine that includes a radial channel, downstream from the normal flow pattern. The radial channel guides the exhaust steam flow in upper half of the hood in the flow momentum direction. Due to this pattern of flow direction, vortex generation in upper exhaust hood is reduced and increased flow diffusion results. The geometric arrangement can eliminate the outer casing of the exhaust hood over the axial length of the turbine inner casing, allowing the turbine inner casing to be supported directly by a foundation for the steam turbine.

The invention discloses an urban sewer network multi-factor monitoring method. The method includes the following specific steps that first, sewage in an urban sewer network is filtered; second, the sewage filtered in the first step is subjected to multi-factor monitoring; the multi-factor monitoring includes sewage flow speed monitoring, sewage liquid level monitoring and sewage temperature monitoring. Through the technical scheme of the urban sewer network multi-factor monitoring method and monitoring system, relevant information such as sewage flow, sewage liquid level and sewage temperature in the urban sewer network can be monitored in real time, and therefore detailed information in the urban sewage network can be fed back to relevant workers in a data mode, problems probably existing in the sewer network can be solved in time, and therefore the phenomenon that the urban environment is seriously affected because the sewage network is blocked is avoided.

This invention relates to the equalization-flow and low resistance dust-clearing system of coal boiler. The character is in that: including smoke channel, multi-Venturi tube and circulating reflux combiner, air-in fractate flow equispaced smoke box, dust-clearing machine. The air-in opening of the smoke channel sets equalization-flow and low resistance 90 degree elbow and the air outlet sets equalization-flow and low resistance 180 degree elbow. The multi-Venturi tube and circulating reflux combiner is set between the equalization-flow and low resistance 90 degree elbow and 180 degree elbow. The air outlet of the smoke channel connects to the air-in opening of the fractate flow equispaced smoke box of which the air outlet connects to the air-in opening of the dust-clearing machine. This invention can not only keep the uniformity of the velocity field, but also clear the vortex which can reduce the resistance value 72% and make the system function continually, steadily and reliably with the collection coefficient eta=30-50% and drag loss DeltaP<=150Pa. This invention can be widely used in kinds of coal boiler especially the dust clearance of fuel electric plant.

The invention discloses a narrow tube wind gathering power generation centrifugal wind power engine which relates to a comprehensive discipline theory of inertial centrifugal effects, centripetal force, dynamic balance, pressure gradient force, viscous force, blade molding, spiral wind attitude causes, turbine effects and the like and a major core technology and belongs to the technical field of the narrow tube wind gathering power generation centrifugal wind power engine. The narrow tube wind gathering power generation centrifugal wind power engine comprises a butt barrel, a front flange, a fluid inlet, a regulating plate A, a fixing ring A, a strutting piece A, an annular ring A, a regulating plate B, a fixing ring B, a regulating plate C, a fixing ring C, a stepped shaft, a strutting piece B, a wind drain channel, an annular ring B, a blade C, a blade B, a blade A, a butt flange, a radial ring A, a radial ring B, a bearing A, a bearing B, a shell A, a shell B, a shell C, a shaft seat A, and a shaft seat B.

The invention discloses a mixed combustion visual combustor, and belongs to the technical field of rocket engines. The combustor comprises an air inlet assembly, a rectification section, a combustionchamber and a coaxial ignition torch; the rectification section is coaxially installed between the air inlet assembly and the combustion chamber; the coaxial ignition torch is installed on the outer circumferential face of the rectification section in the radial direction of the rectification section; the rectifying section is of a columnar structure with a rectangular through hole in the axial direction; a round flange plate and a square flange plate are arranged at the two ends of the rectifying section respectively; the rectifying section is coaxially and hermetically connected with the airinlet assembly through the round flange plate and coaxially and hermetically connected with the combustor inlet end through the square flange plate; a circular hole is formed in the peripheral wall of the rectifying section; the rectifying section is communicated with the coaxial ignition torch through an assembly ignition base; the rectification section is additionally arranged to be matched with the porous injection plate, so that irregular vortex pulsation of airflow is eliminated, and the airflow is stably introduced into the combustion chamber; the section of a flow channel in the rectification section is kept consistent with the section of a flow channel of the combustion chamber, so that a backflow area, namely a vortex structure, is effectively avoided; and therefore a high-quality flow field structure can be obtained in an experiment.

The invention provides a centrifugal blade, a centrifugal fan and an air conditioner. The centrifugal blade comprises a blade body, and a separating plate which is arranged in the blade body, wherein the separating plate comprises a separating body and a shaft sleeve storing part; the separating plate body is arranged in the direction vertical to an axis of the blade body; the shaft sleeve storing part extends in the axis direction of the blade body and passes through the second side of the separating plate body from the first side; the separating plate further comprises an arc-shaped transition part which is arranged at the part in which the shaft sleeve storing part is connected with the separating plate body. According to the centrifugal blade, the arc-shaped transition section is arranged at the part in which the shaft sleeve storing part is connected with the separating plate body, and air can flow in the separating plate direction through the arc-shaped transition part, so that the vortex generated by the air during turning can be removed, and as a result, the purpose of reducing or avoiding vortex noise can be achieved.

The invention relates to the field of pump station engineering, and in particular relates to a vortex-eliminating structure for a suction sump of a pump station. The vortex-eliminating structure for the suction sump of the pump station comprises a vortex-eliminating plate and a horn-shaped pipe, wherein a water pump water inlet pipe is connected to the top end of the horn-shaped pipe, a water inlet is formed in the bottom end of the horn-shaped pipe, the vortex-eliminating plate is horizontally arranged below the bottom end of the horn-shaped pipe, the cross section of the vortex-eliminating plate is X-shaped, and the vortex-eliminating plate is used for eliminating vortexes near the horn-shaped pipe. With the vortex-eliminating structure for the suction sump of the pump station, the vortex strips near the horn-shaped pipe can be effectively eliminated, so that the uniformity of the water flow entering a pump can be improved, and further, the operating efficiency and stability of the water pump can be improved.

The invention discloses a high-performance Halbach type permanent magnet rotor used for a flywheel energy storage system. The high-performance Halbach type permanent magnet rotor comprises a rotor shaft and a Halbach type permanent magnet array adhered onto the rotor shaft, wherein the Halbach type permanent magnet array is formed by arranging permanent magnet blocks magnetizing in radial directions and peripheral directions alternately, and the magnetizing directions change at 90 degrees in sequence; the bottom of each permanent magnet block is arc-shaped, and the diameter of the arc-shaped bottom of each permanent magnet block is smaller than that of the rotor shaft respectively. According to the high-performance Halbach type permanent magnet rotor used for the flywheel energy storage system disclosed by the invention, the bottom of each permanent magnet block is arc-shaped, actually the shapes of the permanent magnet blocks are locally adjusted on the basis of straight lines or oblique lines, and the harmonic content of the magnetic field distribution of the permanent magnet array is effectively reduced, so that the magnetic field distribution is more close to the shape of a sine; and meanwhile, the permanent magnet magnetomotive force can also be increased, the thermal parameters are reduced, and low loss and excellent electromagnetic performance of the motor are finally obtained.

The invention relates to an efficient gas compressor vane wheel, in particular to a gas compressor vane wheel on a turbocharger. The vane wheel comprises hubs, the hubs are of an axial-to-radial streamline-typed arc-turning trumpet shape, and blades are evenly distributed outside the hubs. The gas compressor vane wheel is characterized in that each hub arranged between two adjacent blades is provided with one diversion trench, and the diversion trenches are distributed in a streamline direction on each vane wheel. With the efficient gas compressor vane wheel, collision and friction between gases can be reduced, gas temperature can be reduced and efficiency of the vane wheel can be improved. The efficient gas compressor vane wheel is applicable to superchargers with high-pressure ratio and high-efficiency.

A centrifugal fan, which comprises an air flow chamber disposed inside the volute, an air outlet attached to the air flow chamber and a volute tongue attached to the air outlet; wherein, the volute tongue comprises a tongue body and an enclosed noise-reducing chamber, the tongue body has a plurality of holes for allowing the air flow from the air flow chamber into the noise-reducing chamber; and a sound collector capable of detecting the intensity of noise and a sounder capable of playing sound are disposed in the noise-reducing chamber. The noise is actively reduced and the secondary discharge of the backflow gas is realized, so that the gas backflow is reduced and the vortex is eliminated.

The invention discloses a carangidae fish simulation forwardly bent type multi-blade centrifugal fan blade and a method for manufacturing the same. The carangidae fish simulation forwardly bent type multi-blade centrifugal fan blade is applied to multi-blade centrifugal fans and comprises a blade body. The cross section of the blade body is in the shape of the contour of the cross section of simulated carangidae fish, a medial camber line of the cross section of the blade body is in the shape of a single arc, and a circle center location, an arc radius and an arc center angle of the medial camber line of the cross section of the blade body are determined according to forwardly bent blade profile design methods for the multi-blade centrifugal fans. The carangidae fish simulation forwardly bent type multi-blade centrifugal fan blade and the method have the advantages that flowing of airflow in impellers can be improved by the carangidae fish simulation forwardly bent type multi-blade centrifugal fan blade on the premise that the air volumes are increased, surface pressure pulsation of the carangidae fish simulation forwardly bent type multi-blade centrifugal fan blade can be reduced,and pneumatic noise can be lowered.

The invention relates to a commercial antitheft warning device and a manufacturing method thereof, in particular to an acoustic magnetic anti-theft label with stable property and easy manufacture. The acoustic magnetic anti-theft label with stable property and easy manufacture comprises a narrow box body, at least one resonance member and at least one polarization member, wherein a cover consisting of a double faced adhesive tape and a sealing film covers on the box body, a resonant cavity is formed by sealing the box body and the box cover, and the at least one resonance member is arranged in the resonance cavity; and at least one inhibiting film is made from a nonferromagnetic and nonmetal material and is further arranged in the resonance cavity, and the at least one polarization member and the at least one resonance member are separated by the inhibiting film. At the moment, according to the different positions of the inhibiting film, one of structures is that the polarization member is arranged in the resonant cavity, and the other one structure is that the polarization member is arranged outside the resonant cavity. Therefore, polarization fields are uniformly distributed by the structure, vortex can be eliminated, and a best warning structure can be maintained.

The invention belongs to the field of guide blade structure design applied to sectional multi-stage centrifugal pumps, and particularly relates to a radial guide blade structure with a streamline structure. Forward guide blades are arranged on the disc face of a guide blade disc, backward guide blades are arranged on the back face of the guide blade disc, a forward flow pass and a backward flow pass are formed between every adjacent forward guide blade and backward guide blade. A notch portion penetrating through a disc body is formed in an outlet of the forward flow pass of the guide blade disc, the disc face, where the notch portion is located, of the guide blade disc, the outer blade faces of the forward guide blades, the peripheral surface of the guide blade disc and a guide face arranged opposite to the disc face, where the notch portion is located, of the guide blade disc jointly form a transition cavity, the appearance of the guide face is of a cambered surface structure, the center of curvature of the guide face of the cambered surface structure is located at the end, where the backward guide blades are located, of the guide blade disc, and the curvature radius of the guide face of the cambered surface structure from a water inlet end of the transition cavity to a water outlet end of the transition cavity is reduced gradually. The radial guide blade structure with the streamline structure can reduce ring currents, fluid collision and vortex situations generated in the transition section, energy loss can be restricted effectively, and working efficiency is higher.