Hydrodynamic pressure suspension double-flow pump

Abstract

The invention provides a hydrodynamic pressure suspension double-flow pump, relating to an impeller ultra-small pump which has no external mechanism axis and is driven magnetically. The pump comprises two mutually separate flowing channels; each flowing channel consists of an inlet, an impeller, a pressure water chamber and an outlet; and the geometrical parameters of the flowing channels are the same or different; a stator of the pump is embedded in a pump shell, a permanent magnet is embedded in a rotor; and the stator and the permanent magnet are arranged opposite along a radial direction; a radial gap is formed between the internal surface of the pump shell and the external surface of the rotor, so that liquid hydrodynamic support for restricting axial movement is formed during normal operation of the pump; an axial gap is formed between the front cover plate of each impeller and the corresponding pump cover, so that liquid hydrodynamic support for restricting rotor axial movement is formed during the normal operation of the pump. In such a way, the rotor can be suspended in the pump cavity during normal operation. The pump provided by the invention can be used for meeting double-flow use requirement of different flows and pressures, and good flowing condition can be effectively and favorably formed in the internal cavity of the pump shell, and moreover, the operation reliability of the pump can be improved.

Description

technical field [0001] The present invention relates to a dynamic pressure suspension double-flow pump, in particular to a vane-type ultra-small pump suitable for no external mechanical shaft and no contact between the fluid and the outside of the pump, suitable for extracorporeal blood circulation devices, artificial hearts, aerospace , fluid delivery or thermal control devices in the fields of fine chemicals and biopharmaceuticals. Background technique [0002] According to the supporting structure of the impeller, the currently used vane-type ultra-small pumps mainly include: the form of an external mechanical shaft, and the form of magnetic levitation. For vane-type ultra-small pumps with external mechanical shafts, due to the use of mechanical seals or other shaft sealing devices, the fluid in the pump cannot be completely isolated from the outside of the pump, and it cannot effectively prevent fluid leakage or contact between the fluid in the pump and the outside world...

AI Technical Summary

Problems solved by technology

However, due to the double-suction structure, the axial size of the ultra-small pump is too large; the pump has two inlets, which is not convenient for use in occasions such as extracorporeal blood circulation devices; the gap flow between the double-suction rotor and the pump casing The channel is long, when used as a blood pump or an artificial heart, the blood cells will be subjected to a large shear stress, which is easy to cause hemolysis, etc.

Therefore, the application of ultra-small pumps with double-suction structure will be limited in many fields.

Moreover, for applications such as a total artificial heart, two pumps are usually required to provide two different flows, resulting in an overly complex mechanical system and a large volume

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