Stator Disk Radial Locking for Turbomolecular Pump Assembly
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Solution Overview
Problem
Turbomolecular pumps face challenges in preventing stator disks from becoming wedged during assembly, which complicates the introduction of the disk pack into the pump housing and overall assembly process.
Innovation Solution
A securing device with projections or lugs on the stator disk engages with complementary depressions or grooves on spacer rings, securing the stator disk against radial movement while allowing axial movement and rotation, thereby preventing wedging and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stator disk is assembled without a securing device, then the assembly process is simpler, but the stator disk may become wedged or displaced radially during assembly
Solution Approach 1:
The securing device (projections or lugs) is pre-formed as an integral part of the stator disk structure. These securing features engage with corresponding features on the spacer ring before final assembly, preventing radial displacement and wedging of the stator disk during the assembly process into the pump housing.
2Reliability
If a securing device with projections is added to the stator disk, then radial displacement is prevented, but the device complexity increases
Solution Approach 1:
The securing device (projections or lugs) is formed as an integral part of the stator disk structure itself, merging the securing function with the stator disk structure. This eliminates the need for separate securing components, reducing overall device complexity while maintaining reliable prevention of radial displacement.
Solution Approach 2:
The securing device utilizes simple geometric features (projections or lugs with specific shapes) that engage with corresponding features on the spacer ring. By optimizing the geometry and dimensions of these securing features, reliable radial position control is achieved without requiring complex mechanisms.
Data Source
Figure 1
Figure 2a~3b
Figure 4a~4b
AI summary
The invention relates to a stator disk for a turbomolecular pump, wherein the stator disk extends partially annularly into a plane, has an inner radius and an outer radius and comprises a locking device by means of which the stator disk can be secured at least against radial displacement in the plane relative to a neighboring spacer ring.