Single-shaft variable speed second-level asynchronous heart pump based on error term iterative curve flow channel, and use method

Abstract

The invention relates to a single-shaft variable speed second-level asynchronous heart pump based on an error term iterative curve flow channel, and a use method. The single-shaft variable speed second-level asynchronous heart pump comprises a pump shell flow channel with a pump inlet and a pump outlet, wherein the pump shell flow channel is internally provided with a fixed guide vane body, and afirst-level impeller and a second-level impeller are fixed on a transmission shaft through keys. The single-shaft variable speed second-level asynchronous heart pump also comprises that a direct current permanent magnet motor is fixed on the inner side of a hub of the fixed guide vane body through a shock absorption supporting seat, the shell of a frequency sensor and the tail of the hub of the fixed guide vane are inlaid into a whole, the fixed guide vane body is provided with a plurality of guide vanes which are evenly distributed around an x shaft, the fixed guide vane body is fixed on theinner wall of a shell cavity of the pump shell flow channel through the guide vanes, and the molded line of the inner wall of the shell cavity is an error term iterative curve. The single-shaft variable speed second-level asynchronous heart pump has the advantages of a compact structure, a large flow, a high lift and a small injury to blood cells, a possibility of hemolysis due to the heart pump can be lowered, through a frequency sensor, the revolving speed of the pump can be changed in real time to meet a real-time requirement of the blood pressure and the blood flow of the human body.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and axial-flow heart pumps, and in particular relates to a single-axis variable-speed two-stage asynchronous heart pump with a differential term iterative curve flow channel and a use method thereof. Background technique [0002] The existing known vane-type single-stage heart pumps mainly have two structural forms: axial flow and centrifugal. For the vane-type single-stage heart pump, the demand for blood pressure of the human body is all met by the lift provided by the single-stage impeller, but this will lead to single-stage The pressure difference between the working surface and the back of the impeller blade is too large, which will cause damage to the blood cells and cause hemolysis, which will become more serious with the increase of the head. [0003] The current research on the flow channel form of the vane single-stage heart pump is relatively simple. ZL201911056672.3 discloses a...

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Problems solved by technology

[0002] The existing known vane-type single-stage heart pumps mainly have two structural forms: axial flow and centrifugal. For the vane-type single-stage heart pump, the demand for blood pressure of the human body is all met by the lift provided by the single-stage impeller, but this will lead to single-stage The pressure difference between the working surface and the back of the impeller blade is too large, which will cause damage to blood cells and cause hemolysis. This phenomenon will become more serious with the increase of the lift.

[0003] The current research on the flow channel form of the vane single-stage heart pump is relatively simple. ZL201911056672.3 discloses a centrifugal heart pump with a low hemolysis rate. Although this type of centrifugal heart pump makes the flow in the pump body more uniform, the centrifugal heart pump The structure of the pump determines that no matter how it is improved, the blood must go through the "circular" flow in the volute before entering the outlet channel. The complex internal flow can easily cause damage to blood cells, resulting in hemolysis

ZL201910222234.3 discloses an implantable shaftless heart pump with a gradually changing flow path. A simple superposition does not take into account the actual use needs of different patients

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