Scroll Pump End-Face Spacers for Seal-Free Vacuum Reliability
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Solution Overview
Problem
Conventional scroll vacuum pumps require complex manufacturing processes and tip seals that lead to wear particles, contamination, and reduced operational reliability, making them unsuitable for high-purity vacuum applications and environmentally unsustainable.
Innovation Solution
A scroll pump design that eliminates tip seals by using spacer elements with different tribological properties on the stator and orbiter end faces, allowing for minimal contact and reduced wear, thereby extending maintenance intervals and minimizing particle emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tip seals are used to close the gap between spiral components, then internal backflow is prevented and ultimate pressure is improved, but wear particles are generated causing contamination and reduced reliability
Solution Approach 1:
The patent removes the tip seal component entirely from the system. Instead of using seals that contact the spiral components, the invention uses the orbital motion itself to periodically close the gap between the stator and orbiter spiral components, eliminating the source of wear particles while maintaining the sealing function.
Solution Approach 2:
The invention replaces the durable but wear-prone tip seals with a different approach where the sealing action is achieved through the orbital motion mechanism itself, which has no moving contact parts that would generate wear particles. The 'sealing element' is effectively the orbital path itself rather than a physical component.
2Reliability
If tip seals are installed on end faces of spiral components, then gap sealing is achieved, but manufacturing complexity and costs increase due to required recesses and tight tolerances
Solution Approach 1:
The patent eliminates the need for tip seals and their associated manufacturing complexity. The sealing function is achieved through the orbital motion of the orbiter component, which periodically brings the spiral components into contact without requiring recesses, grooves, or tight tolerances on the end faces.
Solution Approach 2:
The orbital motion of the orbiter component automatically provides the sealing action without requiring additional sealing components. The system uses its own operational motion to achieve the sealing function that would otherwise require separate tip seal components and complex manufacturing processes.
3Reliability
If tip seals are used to prevent contact between spiral components, then wear is prevented, but continuous wear still occurs causing contamination in high-purity applications
Solution Approach 1:
The patent removes the tip seal component that causes continuous wear. By using the orbital motion to close the gap between spiral components, the invention eliminates the moving contact parts that generate wear particles, making the pump suitable for high-purity vacuum applications where even trace contamination is unacceptable.
4Reliability
If tip seals are installed on end faces, then gap closing is achieved, but maintenance intervals are limited due to seal wear
Solution Approach 1:
The patent eliminates the tip seal component that requires periodic maintenance. The sealing function is achieved through the orbital motion mechanism itself, which has no wearing parts, thereby extending the operating time before maintenance is required and improving long-term reliability.
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 scroll pump achieves enhanced operational reliability, reduced wear, and lower manufacturing costs while maintaining high vacuum performance, suitable for high-purity applications with minimal environmental impact.
Implementation Method 1
The spacer element comprises a material that differs from the respective material on the stator end face and the orbiter end face by at least one tribological property
Implementation Method 2
The spacer element is designed to allow a defined contact between the spiral components during operation of the scroll pump in such a way that no contact occurs between the base bodies of the stator spiral component and the orbiter spiral component
Data Source
Figure 1
Figure 2
Figure 3A~4
AI summary
A scroll pump comprises a stator and an orbiter with respective spiral components (210; 220) that mesh together. The orbiter performs an eccentric movement around a rotational axis defined by an axial direction relative to the stator. The respective end faces (216; 226) of the spiral components are axially opposed and spaced apart. At least one spacer element (240) is arranged on one of these end faces (216; 226) of the spiral components. This spacer element projects axially beyond the end face on which it is arranged and has a predefined distance relative to the opposite end face. The spacer element (240) comprises a material that differs from the respective material on the end faces (216; 226) of the spiral components (210; 220) by at least one tribological property.