Vacuum Pump Stator Rib Structure for Thermal Deformation Relief
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Solution Overview
Problem
Conventional vacuum pumps face issues with stator deformation due to temperature changes, leading to potential contact with rotor blades and operational failures.
Innovation Solution
The vacuum pump design incorporates a deformable portion in the outer peripheral rib of the stator, allowing the inner peripheral rib and stator blade to deform radially, reducing deformation towards the rotor blade and preventing contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stator is housed with the outer peripheral rib sandwiched between spacers to maintain positional stability, then the stator's position is fixed, but the stator cannot deform radially to accommodate temperature changes, causing deformation in the rotation axis direction and potential contact with rotor blades
Solution Approach 1:
The outer peripheral rib is segmented by introducing a deformable portion that divides the rib into distinct regions with different mechanical properties. The deformable portion acts as a localized segment that can deform radially while the rest of the stator structure maintains its positional stability between spacers.
Solution Approach 2:
The deformable portion is introduced at a specific location of the outer peripheral rib where radial deformation is needed to accommodate temperature changes. This creates a local region with different mechanical properties (higher flexibility) while the rest of the stator maintains its original rigid structure and positional stability.
2Strength
If the stator is made rigid to maintain structural integrity, then the stator strength is high, but the stator cannot accommodate temperature-induced expansion, leading to deformation toward the rotor blade
Solution Approach 1:
The stator structure is made dynamic by introducing the deformable portion in the outer peripheral rib, allowing the stator to adapt its shape in response to temperature changes. The deformable portion enables radial deformation while the overall structural integrity is maintained through the rigid portions of the stator.
Solution Approach 2:
The mechanical parameters of the outer peripheral rib are changed by introducing the deformable portion, which alters the local stiffness and allows for thermal expansion accommodation. This parameter change enables the stator to adapt to temperature variations while maintaining overall structural strength.
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 design ensures safe operation by minimizing stator deformation, even with temperature changes, thereby preventing contact with rotor blades and ensuring stable pump performance.
Implementation Method 1
at least part of the outer peripheral rib of the stator is provided with a deformable portion configured to allow deformation of the inner peripheral rib and/or the stator blade in a radial direction
Data Source
AI summary
To reduce deformation of a stator in an upper-lower direction. A vacuum pump includes a rotor housed in a housing and rotationally driven, plural stages of rotor blades provided in the rotor, and plural stages of stators, each of which is disposed between adjacent ones of the plural stages of rotor blades. The stator has an inner peripheral rib, an outer peripheral rib, and a stator blade connecting the inner peripheral rib and the outer peripheral rib, and is housed in the housing in a state of the outer peripheral rib being sandwiched between spacers. At least part of the outer peripheral rib of the stator is provided with a deformable portion configured to allow deformation of the inner peripheral rib and/or the stator blade in a radial direction.