Elastic Pump Rotor with Minimal Hysteresis
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Solution Overview
Problem
Existing rotors for fluid pumps are not highly compressible and expandable without undergoing permanent material changes, which limits their efficiency and durability, especially in applications requiring repeated compression and expansion.
Innovation Solution
A rotor designed to be reversibly elastically deformable between a radially compressed state and a radially expanded state, with minimal hysteresis, allowing for optimal compression and expansion without permanent material changes. The rotor's conveyor elements are deformed during operation to increase fluid resistance and maintain an optimal pump gap, ensuring efficient operation and minimizing damage to blood cells in medical applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rotor is designed to be highly compressible and expandable using elastic materials, then the rotor can be deformed between compressed and expanded states, but permanent material changes occur after repeated compression and expansion
Solution Approach 1:
The patent changes the material parameter from conventional elastic materials to a shape memory material that undergoes a phase transformation. This phase transformation allows the material to recover its original shape after deformation without permanent changes, resolving the contradiction between high adaptability and reliability.
Solution Approach 2:
The patent utilizes the phase transition characteristic of shape memory materials. The material transforms between different phases (e.g., austenite and martensite) in response to temperature or stress changes, enabling reversible deformation and recovery without permanent damage, thus solving the reliability issue while maintaining compressibility and expandability.
2Adaptability or versatility
If conventional elastic materials are used for the rotor, then the rotor can be deformed, but hysteresis losses occur during compression and expansion cycles
Solution Approach 1:
The patent changes the material parameters by using shape memory materials with specific phase transformation characteristics. These materials exhibit lower hysteresis losses during phase transformation compared to conventional elastic materials, thereby reducing energy losses while maintaining the necessary deformation capability.
Solution Approach 2:
The phase transition mechanism in shape memory materials provides a more efficient energy conversion pathway during deformation and recovery. The transformation between crystalline phases allows for reduced internal friction and hysteresis, minimizing energy losses while enabling the required adaptability.
3Volume of moving object
If the rotor is made small for medical applications, then it can be introduced through body vessels, but the rotor has limited compression and expansion capability
Solution Approach 1:
The patent applies phase transition characteristics of shape memory materials to enable a compact rotor design that can undergo significant volume changes. The small radial diameter is achieved in the compressed state, and the phase transition allows for expansion to the operating state, thus resolving the contradiction between small size and expansion capability.
Solution Approach 2:
The patent utilizes the unique parameters of shape memory materials to achieve extreme compression ratios while maintaining structural integrity. The material can be compressed to a fraction of its operating volume for introduction through vessels, then recover its full expansion capability at the destination, solving the size versus adaptability contradiction.
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
The rotor achieves high compressibility and expandability with minimal hysteresis, ensuring efficient fluid pumping and reducing the risk of blood cell damage, while maintaining optimal pump performance and durability even at high speeds of rotation.
Implementation Method 1
the rotor can be deformed reversibly elastically between a first, radially compressed state and a second, radially expanded state
Implementation Method 2
with minimised hysteresis or optimally entirely without hysteresis
Data Source
AI summary
A rotor for a pump has a housing and a rotor, and has at least one blade. The rotor is able to be actuated to rotate about an axis of rotation in order to convey a fluid in the axial or radial direction, and the rotor is able to be deformed in the radial direction between a first, radially compressed state and a second, radially expanded state. At a maximum speed of rotation of the rotor at which the power of the pump is at a maximum, the blade is essentially radially oriented, and/or the rotor has its maximum diameter.