Scroll Pump Thrust Bearing Assembly for Stable Orbiting Support
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Solution Overview
Problem
Non-contacting scroll pumps face challenges in maintaining a stable axial position and efficient operation of the orbiting scroll due to the absence of direct contact between the scrolls, which can lead to misalignment and wear issues.
Innovation Solution
A thrust bearing assembly with a coupling structure and ball bearing cages is employed to axially support the orbiting scroll, allowing it to orbit while maintaining a stable position, using a ball and socket joint for self-centering and a tapered recess for easy assembly, and a casing to contain lubricant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peristaltic pump is used to minimize fluid contact, then contamination is reduced, but the pump becomes unsuitable for highly viscous fluids and gases
Solution Approach 1:
The pump divides the rotor into multiple independent roller elements that sequentially compress the tubing, allowing each segment to handle different fluid types while maintaining the overall peristaltic motion pattern that minimizes contamination
Solution Approach 2:
The pump uses an eccentric cam mechanism that dynamically adjusts the compression force and timing of each roller on the tubing, enabling adaptation to highly viscous fluids and gases while preserving the closed-system advantage
2Adaptability or versatility
If a lobe pump or diaphragm pump is used to handle viscous fluids, then fluid compatibility is improved, but dead volumes create contamination risks
Solution Approach 1:
The pump extracts and eliminates dead volumes by designing a system where fluid never contacts pump internal components - the tubing acts as a disposable liner that can be easily removed and replaced, taking out the contamination risk associated with trapped fluid in traditional pump designs
3Measurement precision
If a syringe pump is used for precise fluid delivery, then dosing accuracy is improved, but mechanical complexity and dead volumes increase
Solution Approach 1:
The pump achieves precise dosing through the controlled rotational movement of the eccentric cam mechanism, which self-regulates the compression timing and force on the tubing, eliminating the need for complex feedback systems while maintaining accurate fluid delivery
4Ease of manufacture
If pump components are made accessible for sterilization, then ease of cleaning is improved, but mechanical integrity and sealing may be compromised
Solution Approach 1:
The pump employs disposable tubing liners that can be easily discarded after use and replaced with sterile ones, eliminating the need to disassemble and sterilize complex mechanical components while maintaining mechanical integrity through the durable, reusable pump body
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 solution provides stable axial support and efficient operation of the orbiting scroll, reducing wear and simplifying assembly, while ensuring uniform load distribution on ball bearings.
Implementation Method 1
the roller is configured to compress the elastomeric tubing to form a compression zone that moves through the tubing in use
Implementation Method 2
the roller is configured to compress the elastomeric tubing to form a compression zone that moves through the tubing as the elastomeric tubing expands and recoils to propel fluid forward
Data Source
Figure 1
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AI summary
A non-contacting scroll pump (100), the non-contacting scroll pump comprising a housing (110), an orbiting scroll (130) located within the housing, and a thrust bearing assembly (170) located within the housing for axially supporting the orbiting scroll. The thrust bearing assembly comprises a first plate (171) fixed to the orbiting scroll, a second plate (172) spaced apart from the first plate, and a ball bearing (174) located between the first plate and the second plate, the ball bearing being configured to roll against the first and second plates during orbiting of the orbiting scroll. The thrust bearing assembly further comprises a coupling structure (175) extending between the housing and the second plate to couple the housing to the second plate, wherein the coupling structure is engaged with the second plate such that the second plate is rotatable relative to the coupling structure.