58results about How to "Reduce the probability of impact" patented technology

The invention provides an ecologically-friendly type axial flow pump structure for fishes to pass through. The ecologically-friendly type axial flow pump structure comprises axial flow pump blades, an impeller hub, a runner chamber, a guide vane hub and guide vane blades. One end of each guide vane blade is connected with the guide vane hub, and the other end of each guide vane blade is connected with a guide vane section pipeline. Blade inlet edges of the axial flow pump sweep forward in the rotating direction and downwards extend in the axial direction to form streamlines, and the wing-section heads of the sections of the axial flow pump blades are semicircular arcs. The radial radius of the impeller hub is gradually increased and then is gradually reduced in the liquid flow direction, and the radial radius of the blade inlet edges is maximal. A circular ring is welded to the inlet of the runner chamber. The number of the guide vane blades is not larger than five, and the guide vane inlet edges are the streamlines. A large space is formed by the guide vane inlet edges and blade outlet edges. According to the axial flow pump structure, the probability that the blades collide with the fishes can be greatly reduced, meanwhile, the death rate of the fishes after the fishes are impacted by the blades is reduced, and therefore the survival rate of the fishes is greatly increased, and various fishes can pass through the axial flow pump suitable for large-and-medium pump stations.

The invention provides an impeller of an axial flow pump and an axial flow pump. The impeller of the axial flow pump includes a diversion cap 1, impeller blades 2 and an impeller hub 3; The cap 1 is connected to the bottom of the impeller hub 3, and the generatrix of the impeller hub 3 is tangent to the outline of the local structure of the sphere; the impeller blade 2 is fixed on the impeller hub 3, and the impeller blade 2 includes a blade leading edge 4, a blade trailing edge 5 and a blade The radius of the rim 5 and the blade rim 6 gradually increases along the liquid flow direction, and the surface of the blade rim 6 is the side of the circular platform, and the generatrix of the side of the circular platform where the blade rim 6 is located is parallel to the generatrix of the impeller hub 3 . The present invention adopts the impeller with gradually changing outer diameter, and the outer diameter at the inlet of the impeller is smaller, so as to increase the liquid flow and the axial velocity of the organism passing through the pump, thereby reducing the collision probability between the organism and the leading edge 4 of the blade. In addition, the diameter of the impeller outlet is kept relatively large, which can ensure that the pump head and efficiency meet the requirements of the pumping station.

The invention relates to an unmanned aerial vehicle with the good balance property. The unmanned aerial vehicle comprises a main body and four propellers and further comprises an adjusting mechanism and four rain-shielding mechanisms. The adjusting mechanism comprises an adjusting assembly, a first motor, a first transmission belt and two horizontal moving assemblies. Each horizontal moving assembly comprises a lead screw, a transmission wheel and a moving block. The adjusting assembly comprises a connecting block, two second motors, two driving wheels, two second transmission belts and two positioning rods. Each rain-shielding mechanism comprises a telescopic assembly and a rain-shielding plate. Each telescopic assembly comprises a cross rod, a driving unit, a telescopic frame, a connecting plate, two sliding blocks, two connecting rods, two transmission blocks and two limiting units. According to the unmanned aerial vehicle with the good balance property, the positions of express parcels are adjusted through the adjusting mechanism, the gravity center of the whole unmanned aerial vehicle is adjusted conveniently, thus the balance property of the unmanned aerial vehicle is higher;and express objects can be shielded through the rain-shielding mechanisms, the probability that the express objects are affected by rainwater is decreased, and thus the practicability of the unmannedaerial vehicle is higher.

An artificial hip joint consisting of multi-layer shell core composite structural components includes an artificial acetabular bone (1) and an artificial femoral head (2) which are mutually matched with each other. The artificial acetabular bone (1) has a multi-layer shell core composite structure and is constituted of a ceramic acetabular bone lining (1-1), transitional layers (1-2, 1-3), an acetabular bone shell made of a porous metal or a porous alloy or a porous toughened ceramic (1-4). The artificial femoral head (2) has a multi-layer shell core composite structure and is constituted of a ceramic spherical shell layer (2-1), a transitional layer (2-5) and a toughened ceramic inner core (2-2). The artificial acetabular bone lining and the artificial femoral head spherical shell layer of the hip joint have high rigid, anti-corrosion and anti-wear performance. The artificial acetabular bone shell layer and the femoral head inner core layer have high tough, shockresistant performance.