Impeller fixing structure and fixing method of a miniature rotary mechanical pump

Abstract

The invention discloses an impeller fixing method for a micro-rotating mechanical pump. The impeller fixing method for the micro-rotating mechanical pump is mainly used for fixing micro-rotating mechanical pumps and other micro-shaft ends. The micro-rotating mechanical pump mainly comprises an impeller, a motor shaft and filler. The impeller comprises blades and a hub fixed at the motor shaft end, a filler ladder hole is opened in one end of the impeller hub, a channel is opened in the shaft section of the motor shaft inserted in one side of the impeller hub, and the open direction of the channel is vertical to the axial direction. After the motor shaft passes the impeller hub, the motor shaft channel completely locates in the filler ladder hole in one end of the hub, and the filler is filled and cured in a space surrounded by the filler ladder hole and channel so as to form a hub-motor shaft occlusion structure to fix the impeller on the motor shaft in the small space. Compared with a simple hub-motor shaft splicing technique, the hub-motor shaft occlusion technique structure has a higher fixing intensity.

Description

technical field [0001] The invention relates to a method for fixing a shaft end of a miniature rotary machine, in particular to a method for fixing an impeller of a miniature rotary machine pump. Background technique [0002] With the development of microchannel liquid cooling technology, microfluidic technology, and special pumping technology, micromechanical pumps have a wide range of application space and prospects as the power source of their fluid systems. Among them, the micro-impeller is the hydraulic component of the micro-mechanical pump, which converts the shaft work output by the motor into the kinetic energy and pressure energy of the working fluid. The fixed structure of the shaft end is related to the complexity of the installation process and the reliability of the whole pump operation. [0003] There are many particularities in the micro-shaft end fixing structure. Taking the micro-mechanical pump described in this patent as an example, the diameter of the mo...

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Problems solved by technology

This process also has limitations: the interference of parts in the matching of micro-workpieces is generally on the order of 0.01mm. If the interference is too small, it will easily cause the load to fall off, and if it is too large, it may cause excessive assembly stress and damage the workpiece.

However, there are two main constraints in this invention: one is that the radial size of standard miniature bearings is constrained, and the diameter of the inner ring cannot be reduced indefinitely due to the limitation of the processing technology level; second, the additional miniature bearings increase the manufacturing cost, and usually Yes, the smaller the size of the miniature bearing, the higher the manufacturing cost

[0006] In summary, the application of the common shaft end fixing methods mentioned above to miniature shaft end fixing will result in complex structures, improved machining accuracy, increased assembly difficulty, and low structural reliability.

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