71results about How to "Reduce vortex" patented technology

The invention discloses a heat pump drying device, which comprises a drying box and a control system, wherein the drying box comprises a shell and an air inlet fan, a dehumidifying heat pump, a main fan, a material shelf, an air outlet fan and a heating heat pump which are arranged in the shell; when an air inlet and an air outlet are closed, the dehumidifying heat pump, the main fan, the material shelf, the heating heat pump and the dehumidifying pump are communicated in sequence, and a circulating path of a drying medium is formed in the shell; when the air inlet and the air outlet are opened, the air outlet, the dehumidifying heat pump, the main fan, the material shelf and the air outlet are communicated in sequence to form a one-way circulating path of the drying medium; and an air path between the main fan and the material shelf is arc-shaped, and an inclined air deflector is arranged in the air path. The heat pump drying device can not only realize high-temperature drying but also realize low-temperature drying and can meet temperature and humidify requirements of the same product at different drying stages; and the air path for communicating the main fan with the material shelf and the air deflector is improved, therefore airflow vortex is reduced, and drying quality and speed are increased.

The invention discloses a middle-bent axial flow fan blade, which comprises a hub and a blade. The blade comprises an outer periphery, a front edge and a rear edge. The middle-bent axial flow fan blade is characterized in that: the blade is in a wave shape that at least one continuous wave crest and wave trough are arranged in the radial direction from the front edge to the rear edge. Due to the adoption of the structure, high pressure transferred to the outer periphery is dispersed and prevented. The middle-bent axial flow fan blade can reduce the vortex and turbulence caused by radial flow, thereby improving the air flowing environment, improving the static pressure and the efficiency, and reducing the noise. The middle-bent axial flow fan blade can solve the common deformation problem existing in fan blade molding in the mold production, thereby reducing the manufacturing cost.

The invention discloses a centrifugal fan of an extractor hood. The centrifugal fan comprises a volute and an impeller arranged in the volute. The impeller comprises a plurality of blades. The molded line of each blade comprises a first circular arc located in an inlet and a second circular arc located in an outlet, wherein the first circular arc and the second circular arc are in smooth connection, the radius of the first circular arc is R1, the central angle of the first circular arc is alpha 1, the radius of the second circular arc is R2, and the central angle of the second circular arc is alpha 2. The centrifugal fan of the extractor hood is characterized in that the radius ratio R2/R1 of each first circular arc to each second circular arc ranges from 3.5 to 4, and the central angle alpha 1 of each first circular arc ranges from 85 degrees to 90 degrees. Due to the fact that the more reasonable radius and central angle parameters of two circular arcs of the molded line of each blade are selected, the shrinkage degree of the outlet of each blade and the long and narrow degree of each blade are larger, the outlet speed of the impeller is higher, the number of vortexes in an impeller channel is smaller, the centrifugal fan is more suitable for the application environment of the extractor hood, oil fume can be thrown away from the impeller more easily, and the number of vortexes in the fan is smaller.

The invention discloses a device and method for simulating a permeable pavement stormwater runoff approximate test. The device comprises a water trough, wherein a support capable of regulating the slope of a permeable pavement model is arranged at the bottom of the water trough; the permeable pavement model is arranged inside the water trough; supporting plates extending to the head part and the tail part of the water trough are arranged at the head part and the tail part of the permeable pavement model; water draining pipes are arranged at the bottoms of the supporting plate; a device for reducing vortexes and bubbles caused by water flow state change is arranged on the supporting plate at the inlet of the water trough; the device is formed by a suction pipe array; a constant-water head water tank I communicated with the interior of the water trough is arranged at the head part of the water trough; a water tank II communicated with the interior of the water trough is arranged at the tail part of the water trough; water in the water tank I and the water tank II flow circularly in a test simulating system through a water pump; a set of particle velocity field instrument for measuring the velocity field is arranged above the permeable pavement model.

The invention discloses a device and a method for approximate simulation of particle transport and permeable pavement blockage under the runoff action. The device comprises a water channel, a support capable of adjusting slope of a permeable pavement model is arranged at the bottom of the water tank, the permeable pavement model is arranged in the water channel, devices used for reducing water flow state change to cause eddies and bubbles are arranged at the head and the tail of the permeable pavement level, and each device is composed of a straw array. A water tank I of a constant water head and a water tank II are arranged at the head and the tail of the water channel respectively, a particle collection device is arranged in the water tank II and disposed on an electronic balance, and a particle adding device is arranged in the upper stream of the permeable pavement. Influences on particle transport and hole blockage due to parameters such as inflow amount, infiltration flow, slope and sediment grain size are analyzed through an experiment and numerical simulation method. Research results provide a solid foundation for optimal permeable pavement design.

A skirt guided control valve (2) provides streamlined flow and minimum resistance to flow in flow up and flow down conditions when the valve is open. The skirt guided control valve has a fluid inlet (8), a fluid outlet (6), a passageway (12) disposed between the fluid inlet and fluid outlet, a valve seat (14) and a valve plug (10) with a skirt (16). The valve seat and the skirt portion of the valve plug include blended edges (38) and contoured surfaces (22) to provide for streamlined flow.

The invention discloses a method of extracting high molecular genome from the bacteria. The method contains the steps of: breaking cell wall using lysozyme +protease +SDS or protease +SDS, extracting in TE buffer (removing proteins and polysaccharides), and preciping, washing, drying and dissolving. The invention begins with the factors influencing extracted DNA fragment length and obtains high molecular DNA fragment longer than fragments extracted by conventional method. The genomic DNA extracted in the method has more than 40 kb with OD260/OD280 between 1.8 and 2.0 detecting by absorbance. The method has the advantages of good repeatability and simple operation and can meet the need of the above molecular operation.

The invention relates to a pumping chamber for a shaft seal type nuclear main pump. The pumping chamber is composed of a guide vane body and a pump case. Due to the limitation of the installation space of the nuclear main pump, for the nuclear main pump guide vane body of the nuclear main pump, the axial installation height is reduced by increasing the number of guide vanes and additionally arranging the structure of double diffusion sections; meanwhile, a thermal insulation device needs to be mounted on a shaft seal pump, and the enough installation space is left for a thermal insulation body in the guide vane body structure; and the corresponding structural treatment is conducted on guide vane inlets and guide vane outlets, the backflow of the inlets is reduced, and the radial circulation of the outlets is eliminated. The pump case is of an annular section direct-output type pumping-out chamber structure, the inner wall is smoothly treated, the angle of throat of an outlet is 20 degrees, the backflow of the outlet of the pumping-out chamber can be reduced, the backflow is the main reason causing the pressure pulse, and the influence of the pressure pulse on the efficiency, the stability, the noise and cavitation of a pump assembly is extremely large. The nuclear main pump water pumping chamber is applied to a 2-nd generation nuclear main pump structure.

A rotor blade for a wind turbine with an aerodynamic device, and an aerodynamic device is provided. The rotor blade includes a main body defining a pressure side and a suction side of the rotor blade, and includes a main body trailing edge section. The rotor blade includes an aerodynamic device with an attachment section for attaching the aerodynamic device to the main body trailing edge section, an aerodynamic section for influencing the aerodynamic properties of the rotor blade, and a buckling section for controlling the orientation and/or the shape of the aerodynamic section with regard to the main body. The aerodynamic device is configured such that it deforms elastically for a force component acting in flapwise direction on the buckling section, and deforms abruptly if a force component of about the size of the stability limit of the buckling section acts in flapwise direction on the buckling section.

The invention relates to a snow making system for a performance test device for a freezing and refrigerating cabinet. The snow making system comprises a water and vapor mixing and spraying-out unit, a water tank and an air compressor for supplying compressed air for the water and vapor mixing and spraying-out unit. A water outlet and a snow making water supply opening are formed in the bottom face of the water tank. A water inlet is formed in the side face, away from the water outlet and the snow making water supply opening, of the water tank. The water tank communicates with an air-cooled chiller unit through the water outlet and the water inlet to form a water-cooling circulating loop. The snow making water supply opening communicates with the water and vapor mixing and spraying-out unit. According to the snow making system, water in the water tank flows from top to bottom, the water with the low temperature flows into the water inlet and is mixed with the water in the water tank, the longer the mixing process is, the more uniform the temperature cooling is, and therefore a snow making water region with the most uniform and constant temperature is formed naturally in the bottom region of the water tank, meanwhile it is avoided with an eddy is formed in the water tank and consequently the heat is lost, the stable snow making water temperature is guaranteed, the snow making density is increased and the snow making efficiency is improved.

The invention discloses a double volute wind wheel fan and belongs to air exhaust devices. An existing single volute wind wheel fan has the defects of disaccording with an extractor hood in air suction, unstable in operation, and relatively low in operation efficiency. The double volute wind wheel fan comprises a first fan and a second fan. A first volute of the first fan is connected with a second volute of the second fan. A first air outlet of the first fan and a second air outlet of the second fan are converged together and are jointly connected with an air outlet port. When used for different rangers, the double volute wind wheel fan is even in air suction and enables a whole machine to be enlarged in air quantity, improves smoke suction effect, and remarkably reduces noise. Matching and electronic control of double motors are more suitable for independent or linkage operation of a single range or double ranges, improve efficiency of the whole machine and remarkably show the advantage of energy conservation. Different shapes of air outlets and corresponding ports are selected according to shell bodies of different extractor hoods so as to reduce air outlet resistance and vortex, and therefore air quantity is increased and noise is reduced.

The invention discloses an impeller structure of a mixed transportation pump. The impeller structure comprises a movable impeller and movable impeller blades thereof, a static impeller and static impeller blades thereof; molded lines of the static impeller blades are S-shaped; inlet directions of the static impeller blades are the same with outlet directions of the movable impeller blades; outletplacing angles of the static impeller blades are 90 degrees; bending directions of inlet sections of the static impeller blades are opposite to bending directions of outlet sections; lengths of the inlet sections of the blades are 1/3 of the whole blade length; the molded lines are of smooth gentle transition structures; inlet and outlet thicknesses are smaller than thicknesses of the middle partsof the blades; the inlet positions of the static impeller blades are in front of the outlet positions of the static impeller blades; and seven blades are provided, and are uniformly arranged in the peripheral direction of the static impeller. The molded lines of the static impeller blades are S-shaped, and the inlet directions of the static impeller blades are the same with the outlet directionsof the movable impeller blades, so that the vortex and hydraulic loss in the static impeller of the mixed transportation pump are reduced, the supercharging performance of the static impeller is improved, and the efficiency of the mixed transportation pump is improved.

The invention discloses an elastomer internal flow circling structure constant pressure centrifugal pump. The elastomer internal flow circling structure constant pressure centrifugal pump comprises amain body, main blades, auxiliary blades, a rubber body, a front shell and a rear shell; the main blades are arranged on one side of the main body, the multiple auxiliary blades are arranged on the other side of the main body, the main blades are formed through connecting of first straight blades and second straight blades, the front side faces of the first straight blades and the second straightblades are inclined side wall faces, and rear side faces of the first straight blades and the second straight blades are straight wall faces; a projection area of two adjacent main blades on the mainbody is divided into two parts with the equal area through the projection of the auxiliary blades on the main body, the rubber body is evenly arranged on the outer side wall of a rotating impeller, the rotating impeller is arranged in a conveying cavity of the front shell, a transmission shaft is rotatably arranged in the rear shell, a shaft sleeve is arranged in the rear shell, the shaft sleeve is arranged on the transmission shaft in a penetrating manner, and an upper cleaning way and a lower cleaning way are arranged in the rear shell. The pump is simple in structure, high in hydraulic engineering efficiency, stable in conveying pressure and capable of being widely applied and popularized.

The invention provides a bladeless underwater propulsion system. The bladeless underwater propulsion system comprises a main base body, a vertical propeller set and a horizontal propeller set. The main base body comprises a shell, a variable-frequency direct-current permanent magnet motor, a cable connector, supercharging equipment, a water inlet pipeline, a water outlet pipeline and the like. Thevertical propeller set is used for providing power for the bladeless underwater propulsion system to float upwards, and the horizontal propeller set is used for providing power for the bladeless underwater propulsion system to advance, retreat and turn. An electromagnetic valve is arranged on the water outlet pipeline and used for adjusting the size and direction of water flow of outlet pipelinesof all the branches, then the thrust of all the propellers is changed, and therefore the movement functions of floating, diving, advancing, retreating, turning and the like of the bladeless underwater propulsion system are achieved. The bladeless underwater propulsion system can adapt to underwater severe environments, and has the advantages of high compatibility, low noise, high safety coefficient, compact structure, small size, light weight and the like.

The invention relates to a method for reducing the ship resistance by using the atmospheric pressure, which is characterized in that the outside waterline part of a ship hull is provided with a water-air isolation belt of which the bottom is immersed into water. When the ship moves on the water surface, vacuum zones (or negative pressure zones) are generated on both sides of the stern and the ship hull; because of the water-air isolation belt which is arranged on the outer side of the ship hull and is immersed into the water, air cannot enter the vacuum zones under the water-air isolation belt, and water flow quickly fills up the vacuum zones below the water-air isolation belt so as to greatly reduce the descending extent of water levels on both sides of the stern and the ship hull and reduce the ship resistance.

The invention discloses a compound fertilizer raw material reaction barrel, and relates to the technical field of chemical fertilizer production equipment. A top plate is arranged above a tank cover;a cylinder is fixedly arranged in the middle of the upper side of the top plate; a piston rod of the cylinder is rotationally connected with the middle of the upper side of the tank cover through a bearing after penetrating through the top plate; a barrel body is arranged in a tank body I; a rotating plate is rotationally arranged at the inner bottom of the barrel body; a plurality of stirring strips are fixedly arranged at the upper part of the rotating plate at equal fillets; the bottom end of a rotating shaft sequentially penetrates through the bottom of the barrel body and the bottom of the tank body I and then extends into a tank body II, and a driven gear is fixedly arranged at the extending end; a driving gear is fixedly arranged at the output end of a driving motor; a plurality ofspoilers are fixedly arranged at equal fillets at the upper part of the inner side wall of the barrel body, so that vortexes generated by stirring are reduced, the fluidity of the surface of the liquid raw material is improved, the powdery raw material is prevented from floating on the surface of the liquid raw material, meanwhile, the sealing performance in the reaction process is greatly improved, and the reaction efficiency is improved.

The invention discloses an impeller type pressure-adjustable mechanical sealing component. The impeller type pressure-adjustable mechanical sealing component comprises a shaft sleeve, a movable ring arranged on the peripheral surface of the shaft sleeve, a stationary ring propped against the head face of the movable ring, and a mechanical sealing shell for holding the shaft sleeve, movable ring and stationary ring, a cooling spacer fluid passage is formed between the outer peripheral surface of the movable ring and the inner peripheral surface of the mechanical sealing shell, on the cooling spacer fluid passage , a cooling spacer fluid drive impeller is arranged on the outer peripheral surface of the movable ring, and a volute space which surrounds the cooling spacer fluid drive impeller and is matched with the cooling spacer fluid drive impeller is formed on the mechanical sealing shell. The impeller rotates by means of the high-speed rotation of the movable ring, the centrifugal force generated by the movable impeller can be effectively used for driving the cooling spacer fluid to quickly flow to timely lubricate the movable ring and stationary ring, and the cooling spacer fluid can effectively cool the movable ring and stationary ring.

The invention discloses a main girder structure of a streamlined multi-box girder. The main girder structure comprises at least one middle box grinder, two side box grinders, a plurality of connectingbeams, the bottom of the cross section of each middle box grinder is provided with a first streamlined outward projection from two sides to the middle of the bottom, railways are laid on the middle box grinder, the side box grinders are symmetrically distributed on two sides of the middle box grinders, highways are laid on the side box grinders, the bottom of the cross section of each side box grinder close to one side of the corresponding middle box grinder is provided with a second streamlined outward projection, the cross section of each side box grinder far away from one side of the corresponding middle box grinder is in a shape of a sharp corner, the connecting beams are vertically distributed at intervals and used for horizontally connecting with adjacent side box grinders and middle box grinders or middle box grinders and middle box grinders, and each connecting beam comprises at least one unit connecting beam. The invention further discloses a main grinder of the streamlined multi-box girder. The main girder structure of the streamlined multi-box girder improves wind-resistant stability.

The invention discloses a pulping device and system and a pulping method. The pulping device comprises a motor, a motor support, a rotating shaft, a cylinder, a cylinder support and blades. The motoris fixed to the motor support, and an output shaft of the motor is connected with the rotating shaft through a coupler. A plurality of groups of blades are arranged on the rotating shaft and extend into the cylinder body; the barrel is mounted on the barrel support, a plurality of blocking strips are arranged on the inner wall face of the barrel, a slurry outlet is formed in the upper end of the barrel, and a slurry inlet is formed in the lower end of the barrel. When the blades rotate at a high speed, natural fiber suspension liquid forms high-speed shear flow in a narrow flow channel, at themoment, a tool nose has a certain inclination angle in the axial direction (namely the length direction) or the direction opposite to the axial direction of the natural fibers, cut-in, silk picking and refining are conducted, and then the micro-nano cellulose is obtained. The beating degree can reach 98-degree SR in a very short time. The invention relates to the technical field of papermaking.