Fluid Pump Washer Structure for Axial Rotor Stability
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Solution Overview
Problem
Existing fluid pumps experience significant noise and reduced lifespan due to vertical movements of the impeller and rotor during operation, necessitating a solution to limit axial movements.
Innovation Solution
A fluid pump design incorporating a washer on the motor shaft, axially sandwiched between the pump casing and rotor, to limit axial movements of the rotor and impeller, using a washer with a non-circular cross-section to ensure secure fitting and lubrication grooves for reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the impeller and rotor are allowed to move axially during operation, then the pump can accommodate fluid impact forces, but significant noise is generated and component lifespan is reduced
Solution Approach 1:
A washer is introduced as an intermediary component between the rotor and pump casing. The washer axially sandwiches between these two components, limiting axial movement of the rotor and impeller while accommodating fluid impact forces, thereby reducing noise and extending component lifespan
2Stability of the object's composition
If the washer outer diameter is increased to improve axial limitation, then axial stability is improved, but the pump structure becomes more complex and assembly becomes difficult
Solution Approach 1:
The washer features a non-uniform outer diameter profile with a first end having a smaller outer diameter and a second end having a larger outer diameter. This local variation in dimensions allows the washer to provide adequate axial limitation while maintaining compatibility with the pump casing and rotor geometry, avoiding excessive structural complexity
3Reliability
If the washer is made with a non-circular cross-section, then secure fitting and lubrication are improved, but manufacturing precision requirements increase
Solution Approach 1:
The washer is designed with a non-circular cross-section featuring asymmetric dimensions including a non-circular inner cavity and varying outer diameters at different ends. This asymmetric geometry provides secure fitting through shape compatibility with the motor shaft while the design accommodates standard manufacturing tolerances
Data Source
AI summary
A fluid pump includes a pump casing, an impeller arranged in the pump casing, and a motor for driving the impeller to rotate in the pump casing. The motor includes a stator and a rotor connecting to the impeller. A motor shaft is fixed arranged in the fluid pump, with one end of the motor shaft connected to the pump casing. The impeller and the rotor are rotatably placed around the motor shaft, and a washer is placed around the motor shaft and axially sandwiched between the pump casing and the rotor, for limiting an axial movement of the rotor and the impeller.