Eccentric Bushing Angle Adjustment for Pump Displacement Calibration
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Solution Overview
Problem
Fixed link valveless pumps lack a means for precise calibration of displacement, resulting in accuracy generally not better than ±6% of the target value due to variations in components and molded lengths, 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 for ±10% adjustment by rotating the bushing to change the distance between apertures, thereby adjusting the angle between the motor and pump flanges, enabling precise calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fixed link construction is used, then mechanical stability and thermal stability are improved, but manufacturing precision deteriorates due to inability to perform fine adjustment
Solution Approach 1:
The patent introduces a dynamic adjustment mechanism that allows the fixed link construction to be modified post-manufacturing. The adjustment screw and pivot pin assembly enables the angle between base portions to be dynamically changed, transforming a static fixed link system into one that accepts fine adjustments while maintaining overall structural stability.
Solution Approach 2:
The invention changes the angular parameter of the base assembly by allowing rotation of the upper base portion relative to the lower base portion through the adjustment mechanism. This parameter change capability enables precise calibration of pump displacement while retaining the benefits of fixed link construction for mechanical stability.
2Device complexity
If fixed link construction is used, then device complexity is reduced, but manufacturing precision deteriorates due to component variations
Solution Approach 1:
The adjustment screw acts as an intermediary element between the two base portions, providing a simple yet effective means for fine-tuning the angle. This intermediary mechanism adds minimal complexity to the overall assembly while enabling the necessary precision adjustment for displacement calibration.
3Manufacturing precision
If adjusting screw engagement with pivot pins is used, then manufacturing precision is improved through adjustability, but device complexity increases and mechanical stability deteriorates due to backlash
Solution Approach 1:
The patent implements a dynamic adjustment capability where the angle between base portions can be modified through screw rotation. This dynamic element allows for precise calibration while the overall fixed link construction maintains mechanical stability when properly secured.
Solution Approach 2:
The adjustment mechanism enables changing the angular parameter of the base assembly to achieve precise displacement calibration. The screw mechanism provides controlled parameter adjustment while the fixed link construction ensures stability once the desired parameter is achieved.
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 solution allows for extremely precise calibration of pump output, achieving the required precision while maintaining the mechanical stability benefits of fixed links, such as reduced backlash and thermal stability.
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, two eccentric bushings and a fixed link. The base has a hinge disposed between a motor flange and a pump flange and a pair of spaced apertures disposed opposite the hinge. The first eccentric bushing has a body portion received in a first of the apertures of the base and the second eccentric bushing has a body portion received in one of a second of the apertures of the base or an inner bore of the first eccentric bushing. The axial center line of the inner bore of the first eccentric bushing is offset from an axial center line of the body portion by a first distance and the axial center line of the inner bore of the second eccentric bushing is offset from an axial center line of the body portion by a second distance, wherein the second distance is different from the first distance.