51results about How to "Decrease the velocity gradient" patented technology

The invention discloses a centrifugal fan device remotely controlled with the Bluetooth and with blades adjustable. The centrifugal fan device comprises an outer impeller, an inner impeller, an impeller cover, impeller discs, a film type parameter sensor, a blade adjusting device, an electric push rod and a Bluetooth intelligent terminal; the outer impeller comprises an outer impeller disc and outer blades, and the inner impeller comprises the impeller cover, an inner impeller disc and inner blades; the inner impeller disc of the inner impeller is fixed to a shaft disc; the blades of the outer impeller and the inner impeller are in wing shapes respectively, through cooperation of the inner impeller and the outer impeller, the proper angle of auxiliary impeller blades can be adjusted according to the air volume under different working conditions, the effect of multiple purposes of a centrifugal fan is achieved, the purpose that the centrifugal fan device can still work stably and efficiently under the off-rating condition is achieved, remote control and automated adjustment are achieved through the Bluetooth intelligent terminal, advancement of modern technology will be undoubtedly integrated into production and life of people, and the problem of inconvenience brought by arrangement positions and space is solved through remote control with high controllability and stability.

The invention provides a liquid-state lead bismuth alloy corrosion resisting coating layer and a preparation method thereof and relates to the technical field of material surface treatment. The liquid-state lead bismuth alloy corrosion resisting coating layer comprises a matrix, a coating layer body and a thermally-growing oxide layer, wherein the coating layer body is attached to the surface of the matrix, the thermally-growing oxide layer is attached to the surface of the coating layer body, and the coating layer body is prepared from a material of FeCrAlY. The preparation method of the liquid-state lead bismuth alloy corrosion resisting coating layer comprises the steps: preparing the coating layer body on the surface of the pretreated matrix and then directly performing pre-oxidation treatment on the coating layer body. The FeCrAlY coating layer body of the liquid-state lead bismuth alloy corrosion resisting coating layer disclosed by the invention has good combination with the matrix; the liquid-state lead bismuth alloy corrosion resisting coating layer has the advantages of compact structure, even and controllable thickness, low oxygen content and low surface roughness; pre-oxidation is directly performed on the surface of the coating layer body to in situ generate an even, continuous and compact thermally-growing oxide layer, the thermally-growing oxide layer can directly contact a lead bismuth cooling agent for a long time, and liquid-state lead bismuth alloy corrosion resistance of the coating layer body is improved; a preparation process has the advantages of lowcost, high, efficiency, greenness, environmental friendliness and the like.

The technological process of making wing type centrifugal vane wheel includes the steps of: making the profile with single layer of boss and planar, arc or conic surface in ribbed hollow aluminum section bar with unequal wall thickness and wing, forming slots on the flat front and back disc and arc or conic front disc, inserting, bending and connecting to form vane wheel. The technological process has no welding and no limitation in vane number, and the produced vane wheel has high efficiency, low noise, small size and low cost.

A rotary compressor comprises a housing. A motor and a compressing mechanism are arranged in the housing. The motor comprises a stator and a rotor. The stator is fixedly connected with the inner wall of the housing. The rotor is connected with a crankshaft in the compressing mechanism. The compressing mechanism also comprises a cylinder. A slide plate chute for holding a slide plate and a piston which is sleeved on the periphery of an eccentric shaft of the crankshaft and rotates together with the crankshaft to compress a refrigerant are arranged in the cylinder. The front end of the slide plate contacts with the periphery of the piston. A base bearing and an auxiliary bearing which are used for supporting the crankshaft are arranged at upper and lower sides of the cylinder. The piston comprises a large piston ring and a small piston ring which are concentrically arranged, wherein the small piston ring is sleeved on the periphery of the eccentric shaft; the large piston ring is sleeved on the periphery of the small piston ring; the inner circumference of the large piston ring is in clearance fit with the periphery of the small piston ring and the fit clearance is less than or equal to 40m. The rotary compressor provided by the invention has characteristics of simple and reasonable structure, flexible operation, low manufacturing cost, small frictional power consumption, high energy efficiency ratio and wide application range.

The invention discloses a low shearing plunger type throttling valve used for oil production gathering and transporting. Based on a rotational flow agglomeration and unit mass energy dissipation rate control technology, orifices of a valve cage are designed to be in the tangential direction, a rotational flow chamber which is converged firstly and expanded afterwards is connected behind the orifices, the basic function of flow and pressure adjustment can be achieved on the plunger type throttling valve, meanwhile, the velocity gradient and the turbulence energy dissipation rate in a flow field are reduced, the shearing force of the orifices for fluid is reduced, the liquid drop breaking degree is lowered, and the subsequent oil water separation difficulty is lowered.

The invention relates to a novel partial pressure injection tool. The novel partial pressure injection tool is a depressurizing groove formed by coaxially sheathing a throttling core, an inner throttling ring pillar, an outer throttling ring pillar and an outer cylinder from inside to outside; the throttling core, the inner throttling ring pillar, and the outer throttling ring pillar are variable cross-section; the throttling core is formed by orderly connecting eight spindle shaped grooves with equal groove distance; the shape of the inner throttling ring pillar is the same as that of the outer throttling ring pillar; the inner throttling ring pillar and the outer throttling ring pillar are formed by orderly connecting eight spindle shaped ring grooves with equal groove distance; the spindle shaped grooves of the throttling core is corresponding to the spindle shaped ring grooves of the inner throttling ring pillar one by one, and the spindle ring grooves of the inner throttling ring pillar are corresponding to the spindle shaped ring grooves of the outer throttling ring pillar one by one; the longitudinal section of the spindle shaped ring grooves along the length direction is in the shape of spindle, and the longitudinal section of the spindle shaped grooves of the throttling core along the length direction is also in the shape of spindle; an annular gap between the inner throttling ring pillar and the throttling core is equal to the ring gap between the outer throttling ring pillar and the inner throttling ring pillar; the annular gap between the outer cylinder and the outer throttling ring pillar is slightly more than the annular gap. The novel partial pressure injection tool reduces the shear failure effect on ternary composite solution, and reduces the viscosity loss of flowing through the depressurizing groove.

The invention discloses a hollow blade. The hollow blade comprises a blade body provided with a cavity. A first flow passing hole and a second flow passing hole are formed in the pressure surface andthe suction surface of the blade body correspondingly, and accordingly gas on the outer side of the pressure surface can penetrate through the cavity and flow to the outer side of the suction surface.The provided hollow blade is provided with the cavity, the cavity can reduce the speed of the airflow flowing through the first flow passing hole and the second flow passing hole, the airflow flows out of the suction surface with the low and uniform speed, and influences of the airflow on main airflow in an impeller runner are reduced.

The invention discloses a foam generation device for a toilet bowl. The foam generation device comprises a water inlet pipe, an air inlet pipe, a foaming agent pipe and a mixing device connected to the tail end of a pipe and used for fully mixing water, air and foaming agents and generating foam. The tail end of the mixing device is connected with a foam outlet pipe. The mixing device comprises at least one static mixing unit. A plurality of continuously twisting fins are arranged in each static mixing unit so that liquid entering the mixing device can change the flow direction continuously to achieve mixing of the air and the liquid, and fine foam is generated. The foam generation device has the advantages of being capable of generating high-quality foam continuously even at quite low pressure, not prone to blockage and excellent in foam pushing capacity.

A pylon for attaching a turbine engine, the pylon configured to connect the engine to a structural element of an aircraft. The pylon includes a streamlined profile defined by two opposite lateral faces and defined longitudinally between a leading edge and a trailing edge. On each of its lateral faces the pylon includes a series of deflectors that are transversely spaced apart from one another and that define between them convergent and curved channels configured to accelerate air streams flowing within the channels on aircraft takeoff or in flight to deflect the air streams towards a jet of the engine.

The invention discloses an underwater flow-induced cavity noise control device. The underwater flow-induced cavity noise control device comprises a support, a driving unit and a flow dividing body, wherein the support is mounted on the upper surface of a cavity body, and the upper surface of the cavity body is provided with a cavity communicated with the inner cavity of the cavity body; the support is provided with the flow dividing body at a position corresponding to the cavity, the flow dividing body comprises a straight triangular prism and an extending shaft arranged on the straight triangular prism, and the extending shaft is arranged on at least one bottom surface; the three sides of the straight triangular prism are a flow dividing surface facing towards and facing the cavity, a back flow surface facing away from the cavity and a flow guiding surface connecting the flow dividing surface and the back flow surface; and the extending shaft is connected with the driving unit and isused for driving the straight triangular prism to rotate around the axis of the extending shaft. According to the underwater flow-induced cavity noise control device, on one hand, the boundary layer of the cavity is inhibited from being separated, on the other hand, the speed gradient of the shear layer of the cavity is reduced, the oscillation of the shear layer of the cavity is effectively inhibited, and the noise of the flowing cavity is reduced.

The invention discloses a vortex air classifier non-radial curved blade rotation cage, and belongs to the field of powder preparation. Rotation cage blade molded lines and installation angles are designed based on air flow movement characteristics in a classifier. A detailed implementation method is that rotation cage blades adopt curved blades of which the advancing faces are concave faces; the rotation cage blades are evenly distributed along the circumference direction of the rotation cage, and are vertically fixed between an upper wheel stand and a lower wheel stand; the rotation cage blades are mounted along a non-radial direction, an inlet mounting angle of each rotation cage blade is between 40 degrees and 50 degrees, and an outlet mounting angle of each rotation cage blade is between 80 degrees and 90 degrees. The non-radial curved blade rotation cage can ensure flow lines of air flow in channels among the rotation cage blades to be superposed with the rotation cage blade molded lines, reduces impact of the rotation cage blades to the air flow and powder, inhibits the formation of airflow vortexes among the rotation cage blades, increases the stability of flow fields among the rotation cage blades, improves classifying performance, and further enhances the fine powder yield and classifying accuracy of a vortex air classifier.

The invention relates to the technical field of scramjet engines, and discloses a combustion drag reduction method and device applied to a scramjet engine. Gaseous hydrogen fuel is injected into a concave cavity of a flame stabilizer of the scramjet engine, and forced ignition is achieved through a spark plug, so that the fuel is stably combusted. The flow structure of the scramjet engine is changed through fuel combustion, so that the speed near the wall surface of the scramjet engine is reduced, the speed gradient near the wall surface of the engine is reduced, and the frictional drag of thescramjet engine is reduced. Different from a traditional combustion drag reduction mechanism, the flow structure of the scramjet engine is changed, so that the speed gradient near the wall surface ofthe engine is reduced, and then the friction drag of the engine is reduced. The common understanding of the combustion drag reduction mechanism at present is changed through the method, and the combustion drag reduction mechanism is enriched and perfected.

The invention discloses a dual-impeller for a centrifugal blower. In many industrial sites, the change range of air volume is large, and the flow ranges of small-flow draught fans can not meet the requirements; large-flow draught fans are high in energy consumption when the air volume is small. The dual-impeller comprises an outer impeller and an inner impeller. The surface of each blade is provided with floatable protrusions. The floatable protrusions are in socket joint with the surfaces of the blades through hinged bars. A cavity of each blade is internally and fixedly provided with a transverse reinforcing plate and a plurality of oblique reinforcing plates. A wheel disk flow deflector is fixedly arranged at the position, located under each blade, of a wheel disk of the inner impeller, and a wheel disk flow deflector is fixedly arranged at the position, located under each blade, of a wheel disk of the outer impeller. Different impellers can be selectively switched on according to the requirement for air volume, the reasonable running range of the centrifugal blower can be expanded, and the airflow pressure of the centrifugal blower can be increased, so the centrifugal blower achieves multiple functions; the inner impeller and the outer impeller are switched on simultaneously, the inner impeller does work to low-speed fluid at the corresponding wheel disk, the airflow speed difference of inlets of the blades, the wheel disks and wheel covers can be effectively reduced, and the airflow speed at the inlets of the blades is more uniform, so efficiency is improved, and noise is lowered.

The invention discloses a uniform-air-supply low-flow-resistance pipeline device and a uniform-air-supply low-flow-resistance pipeline design method. The device comprises a main pipeline, tee joints and branch pipelines. The cross-section height of the main pipeline in the length direction is gradually reduced, so that the uniformity of the air supply amount of each branch pipeline is ensured; andthe surfaces of the connecting parts of inlets and outlets of the tee joints are curved surfaces, and the curved surfaces are circular arc surfaces for reducing flow resistance in the main pipeline.The air supply pipeline device can achieve uniform air supply and has the advantage of the low flow resistance.

The invention relates to the technical field of superfine silica powder separation and purification, in particular to a turbine classifier as well as a gradient classifying and purifying system for superfine silica powder. The gradient classifying and purifying system comprises a ball mill and a multi-stage sorting device, wherein the multi-stage sorting device is used for crushing silica powder outputted from the ball mill and carrying out gradient separation on the crushed silica powder stage by stage according to the particle fineness degrees, and comprises sorting units in n stages; and the sorting unit in each stage comprises the turbine classifier and a cyclone separator. The gradient classifying and purifying system provided by the invention has the beneficial effects that through an improvement on the structure of a turbine airflow classifier, the classifying precision and the dispersing effect can be greatly improved; after the silica powder is treated through the sorting units in a plurality of stages, products of which the particle fineness degrees are classified in a gradient manner can be precisely obtained; and then the high-purity superfine silica powder can be obtained.

The invention provides a venturi burner with a noise reduction function. The venturi burner comprises a nozzle and a venturi pipe, the venture pipe comprises a first shrinkage portion, a neck portionand an expansion portion, wherein the first shrinkage portion, the neck portion and the expansion portion are integrally connected. A plate structure is arranged between the venturi pipe and the nozzle, the plate structure comprises an outer plate and at least one inner plate, and the outer plate is connected between the bottom of the first shrinkage part and the nozzle. Each inner plate extends from the inner wall of the outer plate and forms a second shrinkage portion, and the inner plates divide the outer plate to form a plurality of flow channels. Each channel is provided with an air inlet. The venturi burner can rectify and stratify injected air by adding the venturi pipe shrinkage portion to produce the two air inlets, and thus the noise reduction function is achieved; and meanwhile,the two air inlets can meet the injection application of two kinds of air.

The invention discloses a centrifugal fan device with adjustable blades by Bluetooth remote control, which includes an outer impeller, an inner impeller, a wheel cover, a wheel disc, a thin-film parameter sensor, a blade adjustment device, an electric push rod and a Bluetooth intelligent terminal; The outer impeller includes an outer disc and an outer blade, and the inner impeller includes a wheel cover, an inner disc and an inner blade; the inner disc of the inner impeller is fixed on the shaft disc; the shape of the blades of the outer impeller and the inner impeller is a wing Type, by installing the cooperation of the inner impeller and the outer impeller, the appropriate angle of the blades of the auxiliary impeller can be adjusted according to the air volume under different working conditions, so as to realize the multi-purpose effect of the centrifugal fan and achieve stable and efficient work under non-rated working conditions The purpose is to realize remote control and self-regulation through the Bluetooth smart terminal. The advanced nature of modern technology will be integrated into people's production and life. The strong controllability and stable remote control solve the inconvenience caused by the placement location and space. question.

The invention relates to an artificial heart with a physiological gyration back guide vane, belonging to the field of biomedical engineering. The device is composed of a blood pump sleeve, a front guide vane, an impeller and a physiological gyration back guide vane, wherein the front guide vane is fixed at the front end of the blood pump sleeve, and the physiological gyration back guide vane is arranged at the back part of the blood pump sleeve; the impeller is arranged between the front guide vane and the physiological gyration back guide vane; the impeller is connected with the physiological gyration back guide vane through a rotating shaft; and the impeller and the physiological gyration back guide vane are connected with the front guide vane and a rear cantilever bracket by adopting a hemisphere supporting structure. The geometric structure of the physiological gyration back guide vane comprises three parts, wherein the vane of the front section is consistent with the vane of the impeller in trend, the vane of the middle section is parallel to the axis of aorta vessels, and the vane of the rear end is consistent with the aorta in physiological curvature. According to the artificial heart, the physiological gyration back guide vane is used for replacing the traditional back guide vane, so that a blood flow field of a bloodpump outlet is optimized, a gyration blood flow approximating to the normal physiology is generated, the vascular pathological change after implantation is reduced, and the physiological effects of patients after healing are increased.

The invention discloses a centrifugal ventilating vane with a slot. An original model vane is optimized by adopting a slotting technology method; a long vane part of the slotted vane is in a flat plate shape; a short vane part of the slotted vane is in a wing shape; the slotted vane has main parameters including the length, width and thickness of the long vane, the length, width and thickness of the short vane, the slit width, the overlapping length of the long vane and the short vane, and a deflection angle of the short vane; and the slit width, the overlapping length of the long vane and theshort vane and the deflection angle of the short vane have great influence on the performance of a fan. When the short vane reverses the angle, jet flow is formed at a slit, so that a boundary layeron the suction surface side of the short vane is thinned, and separation is inhibited. By means of the slotting technology, the efficiency and the pressure ratio can be improved, the efficient operation area of the fan can be widened, the noise can be lowered, and the phenomenon that a dust-containing and moisture-containing airflow adheres to and abrades the vane in the conveying process can be improved.

The invention provides a method for measuring the content of pyrroloquinoline quinone dimethyl ester by micellar electrokinetic chromatography and belongs to the technical field of chromatographic analysis. Many nervous system degenerative diseases are related to D-serine metabolism. The chemical reaction of the pyrroloquinoline quinone dimethyl ester (PQQZ) and D-serine is analyzed so as to analyze whether PQQZ has the same regulation effect on amino acids and know whether PQQZ has protection effect on nerve cells; therefore, experiment basis is provided for drug design. The method provided by the invention employs the micellar electrokinetic chromatography (MECC) for the first time; the surfactant lauryl sodium sulfate (SDS) is added to a buffer liquid system to form a micelle, and an organic modified reagent is added so that PQQZ is effectively and quickly separated from other electrically neutral impurities different to separate; and the purity of the pyrroloquinoline quinone dimethyl ester is analyzed. The micellar electrokinetic chromatography (MECC) is extremely low in quality detection limit in contrast with other methods, and the dosage of the sample is only nL-level and the consumption of the reagent is also low.

The invention discloses a rectifying and noise-reducing air outlet pipe, which is assembled on the air outlet end of electrical equipment such as a blower and suction machine. The guide part includes a plurality of concave-convex bodies as grooves and / or ribs. The air outlet pipe of the present invention has a rectifying and noise-reducing structure, and a guide part is provided in the port wall of the air outlet pipe, through which the air flow can be differentially diverted, so that the wind energy rectifies the turbulent flow and eliminates the impact of the turbulent flow on the wind. The air outlet resistance of the air outlet pipe makes the air flow smooth and reduces the working noise; the guide part of the air outlet pipe has little resistance to the air flow, and can effectively reduce the velocity gradient at the air outlet and reduce the noise; the rectification of the air outlet pipe reduces the noise. The noise structure is simple and ingenious, which is convenient for production and processing.

The invention provides a method for measuring the content of pyrroloquinoline quinone dimethyl ester by micellar electrokinetic chromatography and belongs to the technical field of chromatographic analysis. Many nervous system degenerative diseases are related to D-serine metabolism. The chemical reaction of the pyrroloquinoline quinone dimethyl ester (PQQZ) and D-serine is analyzed so as to analyze whether PQQZ has the same regulation effect on amino acids and know whether PQQZ has protection effect on nerve cells; therefore, experiment basis is provided for drug design. The method provided by the invention employs the micellar electrokinetic chromatography (MECC) for the first time; the surfactant lauryl sodium sulfate (SDS) is added to a buffer liquid system to form a micelle, and an organic modified reagent is added so that PQQZ is effectively and quickly separated from other electrically neutral impurities different to separate; and the purity of the pyrroloquinoline quinone dimethyl ester is analyzed. The micellar electrokinetic chromatography (MECC) is extremely low in quality detection limit in contrast with other methods, and the dosage of the sample is only nL-level and the consumption of the reagent is also low.

The invention relates to a closed centrifugal pump channel impeller for liquids having an abrasive or aggressive mixture, consisting of a carrier disc and a cover disc and one or more blades arranged therebetween, characterized in that the impeller comprises at least one impeller, the at least one blade has a blade profile that is asymmetrical with respect to the skeleton line in an interface region with respect to the carrier disc and / or the cover disc.

The invention discloses a grille-type flocculating settling device and a construction method thereof. The grille-type flocculating settling device comprises a setting tank; a flocculating unit is arranged at the center of the settling tank; the top of the settling tank is externally connected with an overflow water collecting tank; the flocculating unit comprises a water distributing funnel, a water distributing grille and a flocculating grille; the water distributing funnel, the water distributing grille and the flocculating grille are connected in series from top to bottom. The device utilizes small-diameter grids to enhance small eddy generation so as to benefit collision flocculation of particles; meanwhile, by continuously regulating a distance between the grids, a velocity gradient of water flow is gradually reduced, so that crushing of a flocculating constituent can be effectively avoided; by adopting the device to carry out flocculating settling, the large flocculating constituent can be rapidly formed in short time and settling separation is timely carried out, so that flocculating settling efficiency is effectively improved; when the device is utilized to replace a conventional concentrator for carrying out flocculating settling of slime water, an occupied area of equipment can be reduced and investment and operation cost can be reduced.

The invention relates to a method for determining content of gamma-aminobutyric acid through a micellar electrokinetic capillary chromatography method, and belongs to the technical field of chromatographic analysis. The method comprises the following steps of selection and pretreatment of a fused silica capillary column, electrophoretic analysis conditions, gamma-aminobutyric acid standard curve drawing, sample derivatization and quantitative analysis of gamma-aminobutyric acid. Compared with the prior art, the method has the following advantages that micellar electrokinetic capillary chromatography (MECC) is adopted, sodium dodecyl sulfonate (SDS) and beta-cyclodextrin serve as micelle, an organic modified isopropanol reagent is added, gamma-aminobutyric acid is rapidly, easily and efficiently separated from other free amino acids, and gamma-aminobutyric can be detected within 30 min.

A pylon for attaching a turbine engine, the pylon configured to connect the engine to a structural element of an aircraft. The pylon includes a streamlined profile defined by two opposite lateral faces and defined longitudinally between a leading edge and a trailing edge. On each of its lateral faces the pylon includes a series of deflectors that are transversely spaced apart from one another and that define between them convergent and curved channels configured to accelerate air streams flowing within the channels on aircraft takeoff or in flight to deflect the air streams towards a jet of the engine.