Scroll Pump Bellows Angular Synchronization and Backup
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Solution Overview
Problem
Existing scroll pumps face challenges in maintaining angular synchronization between stationary and orbiting scroll blades, which is crucial for efficient operation, and lack effective back-up systems to prevent damage from excessive drive loads or primary system failure.
Innovation Solution
The implementation of a metallic bellows for primary angular synchronization and a non-contacting back-up system with pins and guide parts to maintain synchronization and prevent damage, ensuring stable operation and extending the pump's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a primary angular synchronization means (metallic bellows) is used to maintain precise angular positioning between scroll blades, then manufacturing precision and reliability are improved, but device complexity increases due to the need for both primary and back-up systems
Solution Approach 1:
The synchronization system is divided into two independent segments: a primary means (metallic bellows) for normal operation and a back-up means (pins and guide parts) for failure scenarios. This segmentation allows each component to be optimized for its specific function while maintaining overall system precision without excessive complexity.
Solution Approach 2:
The back-up synchronization means (pins and guide parts) is pre-installed and positioned to automatically engage when the primary metallic bellows fails. This beforehand cushioning ensures that angular synchronization is maintained even after primary system failure, preventing catastrophic damage without requiring complex real-time monitoring systems.
2Reliability
If contact-type back-up systems are used to prevent damage from excessive loads, then reliability is improved, but particle generation and wear increase during normal operation
Solution Approach 1:
The back-up synchronization means replaces traditional contact-type mechanical protection systems with a non-contacting design. The pins extend into guide parts without touching during normal operation, eliminating friction and particle generation while maintaining the ability to prevent excessive rotation and protect the pump during failure conditions.
3Ease of operation
If the orbiting scroll blade is allowed to rotate freely about its central axis, then ease of operation is improved, but angular synchronization is lost and pump performance deteriorates
Solution Approach 1:
The metallic bellows provides angular synchronization control at specific locations (radial and axial positions) while allowing free orbital motion elsewhere. This local quality approach enables the orbiting scroll blade to move freely in its orbital path while maintaining precise angular positioning relative to the stationary scroll blade where synchronization is critical for pump performance.
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 metallic bellows effectively synchronizes the scroll blades during normal operation, while the back-up system prevents damage from excessive loads or primary system failure, ensuring reliable and long-lasting pump performance.
Implementation Method 1
a metallic bellows that angularly synchronizes the orbiting and stationary scroll blades
Implementation Method 2
a non-contacting back-up system for the bellows having a plurality of pins extending axially in directions parallel to the longitudinal axis of the pump from one of the stationary and orbital parts of the pump, and a guide part fixed relative to the other of the stationary and orbital parts of the pump into which the pins extend
Data Source
AI summary
A scroll pump has a metallic bellows that angularly synchronizes the stationary and orbiting scroll blades of the pump, and a hack-up system for the bellows. The back-up system consists of pins integral with and fixed relative to one of the stationary and orbital parts of the scroll pump, and a guide part that is integral with and fixed relative to the other of the stationary and orbital parts. The back-up system may be a non-contacting hack-up system in which there is no contact between the pins and guide part during normal operation of the pump. Therefore, no particles are created by a wearing away of such parts which would otherwise have the potential to contaminate the fluid being worked by the pump and reduce the useful life of the pump.