Eccentric Bushing Angle Adjustment for Pump Calibration
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Solution Overview
Problem
Fixed link valveless pumps lack a means for fine adjustment to achieve precise calibration of displacement, resulting in accuracy generally not better than ±6% of the target value, which is insufficient for applications requiring ±1% precision.
Innovation Solution
An angle adjustment mechanism using an eccentric bushing with a hexagonal head and offset axial center line, allowing rotation to change the distance between apertures and thus the angle between the motor and pump flanges, enabling ±10% adjustment for precise calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed link construction is used, then mechanical stability and thermal stability are improved, but manufacturing precision deteriorates (accuracy limited to ±6% without fine adjustment capability)
Solution Approach 1:
The patent applies the dynamics principle by introducing a rotatable eccentric bushing that enables the fixed link construction to dynamically adjust its geometry. The eccentric bushing rotates about an axis offset from its geometric center, allowing continuous variation of the effective link length and从而实现 fine adjustment of pump displacement while maintaining the overall fixed-link structural integrity and stability
2Device complexity
If fixed link construction is used, then device complexity is reduced, but manufacturing precision deteriorates (inability to achieve ±1% calibration accuracy)
Solution Approach 1:
The rotatable eccentric bushing provides a dynamic adjustment mechanism within a relatively simple structural framework. By rotating the eccentric bushing, the pump displacement can be precisely calibrated without requiring complex multi-component adjustment assemblies, thus achieving ±1% accuracy while minimizing device complexity
3Manufacturing precision
If adjusting screw engagement is used, then fine adjustment capability is improved, but mechanical stability deteriorates (backlash problems)
Solution Approach 1:
The patent extracts the problematic adjusting screw mechanism and replaces it with an eccentric bushing system. The eccentric bushing eliminates backlash issues inherent in threaded screw mechanisms while retaining the ability to provide fine adjustment of pump displacement through rotational movement, thus improving mechanical stability without sacrificing adjustment capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This mechanism allows for extremely precise calibration of pump output, achieving the required precision while maintaining the mechanical stability and thermal stability benefits of fixed link constructions.
Implementation Method 1
The eccentric bushing has a body portion received in one of the apertures of the base and an inner bore with an axial center line offset from an axial center line of the body portion. Rotation of the eccentric bushing changes the distance between the apertures of the base, thereby changing an angle between the motor flange and the pump flange about the hinge.
Data Source
AI summary
An angle adjustment mechanism for a pump and a motor includes a base, an eccentric bushing and a fixed link. The base has a motor flange for mounting a motor, a pump flange opposite the motor flange for mounting a pump, a hinge disposed between the motor flange and the pump flange and a pair of spaced apertures disposed opposite the hinge. The eccentric bushing has a body portion received in one of the apertures of the base and an inner bore with an axial center line offset from an axial center line of the body portion. The fixed link has a first pin portion received in the inner bore of the eccentric bushing and a second pin portion received in the other of the apertures of the base. With this arrangement, rotation of the eccentric bushing changes the distance between the apertures of the base, thereby changing an angle between the motor flange and the pump flange about the hinge.