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

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 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.

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 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 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.