Scroll Pump Two-Piece Crankshaft Maintenance
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Solution Overview
Problem
The maintenance of scroll pumps is challenging due to the need to precisely adjust and reassemble the adjusting nut, which can be time-consuming and prone to errors, especially during replacement of tip seals.
Innovation Solution
A scroll pump configuration that includes a stub shaft removably attached to the crank, allowing for easier disassembly and reassembly of the orbiting scroll, thereby simplifying the maintenance process and reducing the risk of errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the adjusting nut is precisely adjusted and reassembled during maintenance, then the positioning accuracy is improved, but the maintenance time increases
Solution Approach 1:
The crankshaft is divided into two separate parts: a stationary crankshaft body and a removable stub shaft. The stub shaft can be detached and reattached without affecting the adjusting nut position, thereby segmenting the maintenance operations to reduce time while preserving positioning accuracy.
Solution Approach 2:
The stub shaft is extracted as a separate removable component from the crankshaft. This allows maintenance personnel to remove and reinstall the stub shaft independently without disturbing the adjusting nut, effectively separating the time-consuming adjustment operation from routine maintenance.
2Ease of repair
If the orbiting scroll is removed for tip seal replacement, then the maintenance accessibility is improved, but the risk of reassembly errors increases
Solution Approach 1:
By segmenting the crankshaft into a stationary body and a removable stub shaft, the invention allows the orbiting scroll to be removed and reinstalled without affecting the critical adjusting nut position. This segmentation prevents reassembly errors while maintaining ease of repair.
Solution Approach 2:
The removable stub shaft acts as an intermediary component that facilitates the removal and reinstallation of the orbiting scroll. By providing a dedicated interface for the orbiting scroll connection, it serves as a mediator that enables easy access while preventing errors in reassembly.
3Adaptability or versatility
If the adjusting nut position is disturbed during disassembly, then the disassembly flexibility is improved, but the manufacturing precision is worsened
Solution Approach 1:
The crankshaft is segmented into a stationary body containing the adjusting nut and a removable stub shaft. This segmentation allows flexible disassembly of the stub shaft without disturbing the adjusting nut position, thereby maintaining manufacturing precision while improving disassembly flexibility.
Solution Approach 2:
The stub shaft is extracted as a separate component that can be removed and reinstalled without affecting the adjusting nut. This extraction provides disassembly flexibility for maintenance operations while preserving the precise positioning of the adjusting nut.
Data Source
AI summary
In a pump head for a scroll pump, an orbiting scroll is coupled to a crank of a crankshaft. As the crankshaft rotates, the crank drives the orbiting scroll to orbit relative to one or more fixed scrolls to pump fluid from an inlet to an outlet. A stub shaft is attached to the crank and may be removed as part of an at least partial disassembly of the pump head. An adjusting nut may adjust an axial position of the orbiting scroll relative to the fixed scroll(s). The adjusting nut may be removed, and thereafter reinstalled, together with the stub shaft without altering an axial position of the adjusting nut relative to the stub shaft.