A fluid mechanical impeller

Abstract

The invention relates to a novel impeller for a fluid machine, which can be applied to the fluid machine for generating and recovering the pressure. The novel impeller is mainly characterized by comprising a rear cover plate, a front cover plate and blades, wherein the rear cover plate is arranged at blade inlets, is in a cylindrical structure and is axially parallel to a centrifugal pump; the rear cover plate is in smooth connection with the blade inlets, and is concave towards the central part of the impeller in a concave structure at the position matched with the blades; the edges of the blade inlets at the front cover plate are vertical to the axial direction, and the rear cover plate and the front cover plate are connected at the blade inlets by an arc-shaped smooth curve to form an impeller inlet; the blades are smooth curved surfaces arranged between the blade inlets and blade outlets; the ratio of the area of an outflow outlet of an overflowing section of the impeller to the area of an inflow inlet of the overflowing section of the impeller is between 0.75-0.95, 2-3 blades are arranged, the overlapping angle among all the blades is within 5 degrees and the outlet angles of the blades are more than 35 degrees. Compared with the prior art, the novel impeller has the advantages that the efficiency is improved, meanwhile the suctioning performance is improved, the energy recovery efficiency is improved by increasing the rotating speed, and the internal wear is reduced when a medium containing solid particles is conveyed.

Description

technical field [0001] The invention belongs to components for liquid delivery pumps or energy recovery turbines, and in particular relates to a novel fluid mechanical impeller. Background technique [0002] For traditional low-speed centrifugal pumps, the outlet area is designed to be larger, and the ratio of the outlet area to the inlet area is about 1.1 to 1.6. In order to illustrate the past technology, the radial flow of the three-dimensional impeller is illustrated in a two-dimensional model (see figure 2 ), as shown in Figure c, due to the increase of the outlet area and the decrease of the flow velocity, the dynamic pressure is transformed into static pressure, but due to the non-uniform decrease of the flow velocity, pressure fluctuations are generated near the impeller outlet, and the vortex will be generated at A. In addition, from the axial direction of the impeller, the angle of overlap between the blades and the blades is relatively large, because of this over...

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Problems solved by technology

Under traditional technical conditions, there is no other way to solve the problem only by using superhard materials that can resist wear

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