Scroll Pump Orbiting Plate Segmentation for Tip Seal Maintenance
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Solution Overview
Problem
Existing scroll pumps, particularly dry multi-stage types, face challenges in replacing tip seals without complex disassembly and reassembly processes, which can be time-consuming and require access to sensitive components like bearings.
Innovation Solution
A scroll pump design where the orbiting plate scroll has a central and outer peripheral portion, allowing the outer peripheral portion to be axially removable without rotating, enabling easy access and replacement of tip seals without disassembling bearings, and a method to replace tip seals by detaching the outer stationary plate scroll, removing the outer peripheral portion of the orbiting plate scroll, exposing the tip seal, and reattaching it with new seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the orbiting plate scroll is made as a single integrated piece, then the structural strength and sealing performance are improved, but the complexity of tip seal replacement increases significantly
Solution Approach 1:
The orbiting plate scroll is divided into two separate parts: a central portion and an outer peripheral portion. This segmentation allows the outer peripheral portion to be removed independently for tip seal replacement while keeping the central portion in place, thus maintaining structural integrity while enabling easy maintenance.
Solution Approach 2:
A retention mechanism acts as an intermediary between the central portion and outer peripheral portion of the orbiting plate scroll. This retention mechanism allows the outer peripheral portion to be temporarily detached and reattached, facilitating tip seal replacement without requiring complete disassembly of the scroll assembly.
2Ease of repair
If the outer peripheral portion of the orbiting plate scroll is made completely detachable, then tip seal replacement becomes easy, but the structural integrity and rotational stability may be compromised
Solution Approach 1:
By segmenting the orbiting plate scroll into central and outer peripheral portions, the design allows selective removal of only the outer peripheral portion containing the tip seals, while the central portion remains fixed to maintain rotational stability and structural integrity during operation.
Solution Approach 2:
The retention mechanism serves as an intermediary that provides controlled detachability. It allows the outer peripheral portion to be removed when needed for maintenance but ensures secure reattachment during normal operation, thus maintaining rotational stability while enabling easy repair.
3Difficulty of detecting and measuring
If complex disassembly procedures are used to access tip seals, then complete access to all components is achieved, but maintenance time and operational downtime increase
Solution Approach 1:
The orbiting plate scroll is segmented so that the outer peripheral portion can be independently removed. This allows direct access to tip seals without requiring disassembly of the entire scroll assembly or bearing components, significantly reducing maintenance time while ensuring complete access to seal components.
Solution Approach 2:
The outer peripheral portion containing the tip seals is extracted as a separate removable component. This extraction allows maintenance personnel to access and replace tip seals directly without needing to disassemble other critical components, thereby minimizing operational downtime.
Data Source
AI summary
A scroll pump facilitates the installation of a new tip seal between an axial end of the scroll blade of one of inner stationary and orbiting plate scrolls of the pump and the plate of the other of the inner stationary plate and orbiting plate scrolls. To this end, the orbiting plate scroll has a central portion and an outer peripheral portion extending around and seated on the central portion. The outer peripheral portion of the orbiting plate scroll is keyed to and/or fastened to the central portion such that the outer peripheral portion is not rotatable relative to the central portion and yet is axially removable from the central portion. The tip seal can be readily accessed and replaced by removing the outer peripheral portion of the orbiting scroll plate from the central portion.