Vacuum Pump Rotor Assembly Reinforcing Ring Connection
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Solution Overview
Problem
Existing vacuum pumps, such as turbomolecular pumps, have limited maximum speed and torque due to a non-rotatable connection between rotor disks and the rotor shaft, restricting pump performance.
Innovation Solution
A method for producing a rotor arrangement with a rotor shaft and rotor disks connected via a reinforcement ring using a transverse press connection, such as an expansion or shrink press connection, to enhance torsional strength and allow operation at high speeds and torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a non-rotatable connection (shrink fit or clamping ring) is used between rotor disks and rotor shaft, then the rotor assembly can be manufactured with conventional methods, but the maximum speed and torque are limited due to insufficient connection strength
Solution Approach 1:
The invention uses a composite structure consisting of the rotor disk, reinforcing ring, and rotor shaft as integrated components. The reinforcing ring acts as an intermediate element that composite the rotor disk and rotor shaft into a stronger unified structure, enabling the assembly to withstand higher speeds and torques while maintaining structural integrity
Solution Approach 2:
The rotor assembly is segmented into distinct functional components: rotor disk, reinforcing ring, and rotor shaft. The reinforcing ring is introduced as a separate segment that specifically addresses the strength limitation without requiring complete redesign of the entire rotor assembly, allowing modular manufacturing and assembly
2Strength
If the rotor disks are shrunk onto the rotor shaft or connected by clamping rings, then the assembly process is straightforward, but the torsional strength is insufficient for high-speed operation
Solution Approach 1:
The reinforcing ring is installed beforehand on the rotor disk to provide structural reinforcement before the rotor disk is mounted on the rotor shaft. This pre-reinforcement ensures that the assembly can withstand high torsional loads and operational stresses from the outset, preventing failure during high-speed operation
3Productivity
If conventional connection methods are used, then manufacturing is simpler, but the pumping capacity is restricted due to limited maximum speed and torque
Solution Approach 1:
The invention changes the structural parameters of the rotor assembly by introducing the reinforcing ring with specific geometric characteristics (radial thickness, axial height, material properties). This parameter modification enables the assembly to achieve higher critical speeds and torque capacities, directly increasing the pumping capacity of the vacuum pump system
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 reinforced connection enables safe operation at high speeds and torques, significantly increasing pump performance and reducing the risk of rotor failure, thereby achieving high pumping capacities.
Implementation Method 1
whereby the rotor disk expands when heated and the expansion joint is formed
Implementation Method 2
By shrinking, the reinforcing ring can form a shrink-fit connection with the rotor disk
Data Source
Figure 1~2
Figure 3
AI summary
PROBLEM TO BE SOLVED: To provide a process for manufacture of a rotor device for a vacuum pump, in particular, a turbo molecular pump that can accommodate for a high pump performance and that can be driven under a high rotational speed and a high torque without any danger.SOLUTION: A problem described above is solved by a process for manufacture of a rotor device for a vacuum pump, in particular a turbo molecular pump including one rotor shaft (10), at least one rotor disk (12) connected to the rotor shaft (10), and at least one reinforcing ring (14) enclosing the rotor disk (12). In this case, the method of this invention includes a pressing contact connection in one cross sectional direction, in particular an extension pressing contact connection or a shrinkage pressing contact connection formed between the reinforcing ring (14) and the rotor disk (12).