Angular Synchronization of Scroll Pump Blades Using Metallic Bellows
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Solution Overview
Problem
Existing scroll pumps face challenges in maintaining the angular synchronization of stationary and orbiting scroll blades, which is crucial for stable pocket formation and efficient fluid intake and discharge operations.
Innovation Solution
A pump head assembly with an annular metallic bellows and a fixture system that allows for angular alignment and synchronization of the scroll blades during assembly, ensuring the bellows are fixed to both the orbiting plate scroll and the frame without interrupting the tip-seal receiving surface, and pre-loading the eccentric drive mechanism bearings without breaking the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the orbiting plate scroll is coupled to the eccentric driving mechanism to enable orbiting motion, then the pump can perform fluid intake and discharge operations, but the orbiting scroll blade may rotate in excess about its own central axis, causing loss of angular synchronization with the stationary plate scroll
Solution Approach 1:
The patent applies preliminary action by pre-positioning the orbiting plate scroll at a predetermined angular position relative to the stationary plate scroll during assembly. The angular alignment feature establishes the correct angular relationship before the pump begins operation, ensuring that the orbiting scroll blade maintains proper synchronization with the stationary scroll blade throughout its orbiting motion.
Solution Approach 2:
The patent introduces an angular alignment feature as an intermediary element between the orbiting plate scroll and the stationary plate scroll. This feature acts as a mediator that transfers and maintains the predetermined angular relationship during assembly, ensuring that the orbiting scroll blade is correctly positioned relative to the stationary scroll blade without requiring complex control mechanisms during operation.
2Strength
If fasteners are used to fix the bellows to the orbiting plate scroll, then the bellows can be securely attached, but the fastening process may interrupt or damage the tip-seal receiving surface of the orbiting plate scroll
Solution Approach 1:
The patent applies segmentation by dividing the bellows structure into distinct components: an annular flange at the first end and a separate bellows body. The flange is positioned to overlap the periphery of the orbiting plate scroll without interfering with the tip-seal receiving surface, allowing fasteners to attach the flange to the scroll while the bellows body extends away to provide sealing functionality. This segmentation enables secure attachment while preserving the integrity of the tip-seal receiving surface.
Data Source
AI summary
Parts of a pump head of a scroll pump facilitate an assembly process in which the stationary and orbiting scroll blades of the pump are angularly aligned or synchronized with one another. A metallic bellows of the pump head provides a primary means of synchronizing the stationary and orbiting scroll blades. The assembly process may be carried out using a fixture configured to be mountable to an assemblage including the bellows and the orbiting plate scroll. The fixture has a reference feature, and the orbiting plate scroll or the frame has another reference feature that can be aligned with the reference feature of the fixture, in the circumferential direction of the bellows, during the course of the assembly process.