Integrated Rotor Shaft and Vane Elements for Pump Assembly
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Solution Overview
Problem
The assembly and manufacturing of multi-stage rotary vane pumps are complicated and expensive due to the large number of component parts, requiring precise assembly tolerances and increasing production costs.
Innovation Solution
The rotor elements and shaft are formed in one piece, eliminating the need for individual mounting and reducing assembly complexity, with a two-part partition wall design and pre-mounted components for simplified assembly, and an integrated oil reservoir for efficient oil separation and filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rotor elements are mounted individually on the rotor shaft, then assembly flexibility is improved, but assembly complexity and manufacturing cost increase
Solution Approach 1:
The rotor elements are merged with the rotor shaft to form a single integrated component. This eliminates the need for separate mounting operations and reduces the number of parts that need to be assembled, thereby reducing assembly complexity while maintaining the functional flexibility of having multiple rotor elements.
2Ease of repair
If rotor elements are mounted individually on the rotor shaft, then component replacement is improved, but manufacturing cost and assembly time increase
Solution Approach 1:
By combining the rotor elements and rotor shaft into a single component, the manufacturing process is simplified and assembly time is reduced. While individual component replacement becomes more difficult, the overall productivity improvement from reduced assembly time and simplified manufacturing compensates for this limitation.
3Ease of manufacture
If multiple partition wall elements are used, then assembly is simplified, but device complexity increases
Solution Approach 1:
The partition wall is segmented into multiple elements that can be assembled together. This allows for simpler manufacturing of individual elements and easier assembly, as the partition wall can be constructed in sections rather than as a single complex piece. The segmentation principle resolves the contradiction by making the overall system easier to manufacture while managing complexity through modular design.
4Manufacturing precision
If rotor elements are formed in one piece with the rotor shaft, then assembly tolerances are improved, but manufacturing complexity increases
Solution Approach 1:
The rotor elements and rotor shaft are formed as a single integrated component, which eliminates the need for separate assembly operations and associated tolerance accumulations. This merging approach improves manufacturing precision by avoiding the need to match tolerances between separate parts, while the manufacturing complexity is managed through the use of modern forming techniques that can produce complex integrated geometries.
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 approach significantly reduces manufacturing and assembly costs, simplifies the assembly process, and avoids inaccuracies associated with individual component mounting, while ensuring efficient oil separation and gas purification.
Implementation Method 1
the rotor shaft, comprising rotor elements particularly of a cylindrical design, is arranged eccentrically to the suction chambers
Implementation Method 2
At an inlet of the suction chamber, a chamber formed adjacent to the sliding vane has a large volume. Due to the eccentricity, this volume will decrease continuously all the way to the outlet when the rotor element is rotated in the suction chamber. Thereby, the conveyed gas will be compressed.
Implementation Method 3
The multi-stage rotary vane pump comprises a first rotor element arranged in a first suction chamber, and a—in flow direction—last rotor element arranged in a last suction chamber. The first suction chamber is connected to the pump inlet and the last suction chamber is connected to the pump outlet. The pump outlet is connected to an oil reservoir...
Data Source
AI summary
A multi-stage rotary vane pump comprising at least two rotor elements. The rotor elements are supported by a rotor shaft. The rotor elements and the rotor shaft are in the form of a single piece.