Miniature centrifugal blood pump capable of preventing hemocyte damage and circular blood supply method of miniature centrifugal blood pump

Abstract

The invention discloses a miniature centrifugal blood pump capable of preventing hemocyte damage and a circular blood supply method of the miniature centrifugal blood pump, for solving the problems that in the prior art, the boundary layer thickness, secondary flow and vortex noise in the miniature centrifugal blood pump can not be well controlled. Two suction surface concave point groups distributed at an interval along the blade molded line are arranged the front edge of a blade suction surface of an impeller, and three pressure surface concave point groups distributed at intervals along the blade molded line are arranged at the front edge of a blade pressure surface; for a front hub, a front hub small wing is arranged at the outlet end of a blade channel of an impeller, and for a rear hub, two rear hub small wings are arranged at the outlet end of a blade channel of an impeller. The two suction surface concave point groups and the three pressure surface concave point groups cause the change of the local boundary layer, so that the blood with large viscosity can be separated from the surface of the blades, and the thickness of the boundary layer is reduced; the front hub small wing and the two rear hub small wings control the radial flow of liquid, and thus the jet flow wake loss and vortex noise are reduced.

Description

technical field [0001] The invention belongs to the technical field of micropumps, and relates to a microcentrifugal blood pump with high efficiency, low noise, and low damage to blood cells, in particular to a microcentrifugal blood pump with smooth concave points on the front edge of the blade and small wings on the front and rear hubs of the impeller and its circulation. blood supply method. Background technique [0002] Pump is a kind of general-purpose machinery with a wide range of applications. It plays a huge role in human production and life. Pumps of different types and sizes are constantly being manufactured and used in various industries according to new application needs. middle. According to the different characteristic scales, pumps can be roughly divided into the following categories: conventional pumps, micro pumps and micro pumps. Among them, the characteristic scale range of micro-small pumps is roughly 1-50 mm, while the characteristic lengths of micro-...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the prior art cannot well control the boundary layer thickness, secondary flow and eddy current noise in the micro blood centrifugal pump, and provide a micro centrifugal pump with smooth concave points on the leading edge of the blade and small wings on the front and rear hubs of the impeller. Blood pump and its circulating blood supply method, the smooth concave point weakens the wall shear stress distribution at the leading edge of the impeller, controls the secondary flow of radial movement, and controls the thickness of the boundary layer on the blade surface; for the impeller flow channel with large flow instability Adding winglets at the outlet of the impeller can improve the flow conditions at the impeller, suppress the vortex structure at the outlet of the impeller, and reduce the vortex noise caused by the wake of the blade; through the improvement of different positions of the impeller of the micro centrifugal pump, this type of centrifugal pump Lower flow shear stress, higher operating efficiency and lower noise

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