Turbomolecular Drag Pump Rotor Integration
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Solution Overview
Problem
Existing vacuum pumping arrangements are complex and inefficient due to the need for separate support structures between turbomolecular and molecular drag pumping mechanisms, which impede gas flow and increase system complexity.
Innovation Solution
The turbomolecular pumping mechanism supports the rotor of the molecular drag pumping mechanism, eliminating the need for a separate support plate and allowing direct gas flow between the two mechanisms, thereby simplifying the system and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a separate apertured plate support structure is used between turbomolecular and molecular drag pumping mechanisms, then structural support is provided, but gas flow is impeded and system complexity increases
Solution Approach 1:
The patent combines the support function with the gas flow path by integrating the molecular drag rotor directly onto the turbomolecular rotor blades. This eliminates the separate apertured plate support structure, reducing system complexity while maintaining both structural support and optimal gas flow between the two pumping mechanisms.
2Strength
If a separate apertured plate support structure is used between turbomolecular and molecular drag pumping mechanisms, then structural support is provided, but gas flow is impeded
Solution Approach 1:
The patent merges the support structure with the gas flow path by directly mounting the molecular drag rotor on the turbomolecular rotor blades. This integration eliminates the apertured plate that would impede gas flow, allowing unrestricted molecular flow between the two pumping mechanisms while still providing the necessary structural support through the rotor blade connection.
3Device complexity
If the rotor of molecular drag pumping mechanism is supported by rotor blades of turbomolecular pumping mechanism, then system complexity is reduced and gas flow is improved, but support structure must be integrated
Solution Approach 1:
The patent integrates the molecular drag rotor support directly onto the turbomolecular rotor blades, eliminating the need for separate support plates and reducing system complexity. While this integration increases manufacturing complexity, it provides significant benefits in gas flow efficiency and overall system performance, making the additional manufacturing effort justified by the operational improvements.
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
This configuration results in a more compact, efficient vacuum pumping arrangement with improved gas flow and reduced complexity, as the rotor blades of the turbomolecular mechanism directly support the molecular drag mechanism, enhancing operational control and reducing inertia.
Implementation Method 1
the rotor blades collide with molecules in a gas urging them towards the pump outlet
Implementation Method 2
Rotation of the molecular drag pumping mechanism imparts a velocity to gas molecules entering it from the exhaust of the turbomolecular pumping mechanism tangentially to the circumference of the cylinder and along spiral channels
Data Source
AI summary
A vacuum pumping arrangement comprises a turbomolecular pumping mechanism and a molecular drag pumping mechanism connected in series. A rotor of the molecular drag pumping mechanism is supported by the rotor blades of the turbomolecular pumping mechanism.