Vacuum Pump Stator Blade Support Structure for Rigidity
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Solution Overview
Problem
The existing methods for manufacturing stationary blade portions in vacuum pumps, such as turbo-molecular pumps, using plastic working result in stator blades with low rigidity and easily changed blade angles due to lack of support between the disc plate and the blade portions, leading to potential cracking and reduced exhaust efficiency.
Innovation Solution
The vacuum pump design incorporates stator blades with inner and outer circumferential side support portions that are three-dimensionally connected to the stationary blade portion main body, featuring a cutout in the outer circumferential side support to prevent cracking and enhance rigidity, manufactured through a drawing process that increases the blade angle and height while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stationary blade portions are manufactured by plastic working without support members, then the manufacturing cost is reduced, but the rigidity of the stator blades decreases and the blade angle becomes easily changed
Solution Approach 1:
The stationary blade portion is segmented into a disc plate, multiple stator blades, and support portions. The support portions are separately formed and then integrated with the disc plate through plastic working, allowing each component to be optimized independently while maintaining overall structural integrity and rigidity
Solution Approach 2:
The support portions are preliminarily formed on the disc plate before the final shaping of the stator blades. This preliminary action ensures that the support structure is already in place to provide rigidity during subsequent manufacturing steps and operation, preventing blade angle changes
2Device complexity
If the blade portions are isolated from the disc plate without support members, then the manufacturing process is simplified, but the stator blades have small rigidity and the blade angle is easily changed
Solution Approach 1:
The support portions merge the functions of structural support and blade attachment into a single integrated component. The support portions are formed as an integral part of the disc plate through plastic working, combining the functions of reinforcement and mounting while maintaining manufacturing simplicity
Solution Approach 2:
The support portions are strategically positioned at specific locations on the disc plate where rigidity is most needed. Rather than uniformly reinforcing the entire structure, the support portions are localized to provide targeted reinforcement at the blade attachment points, maintaining blade angle stability where required
3Productivity
If the stator blades are formed with large blade angle and height, then the exhaust efficiency is improved, but the likelihood of cracking increases
Solution Approach 1:
The support portions are formed beforehand on the disc plate to provide structural cushioning and reinforcement. This preliminary support structure prevents stress concentration and cracking during the plastic working process that forms the large-angle, high blades, enabling the achievement of improved exhaust efficiency without compromising reliability
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 enhances the rigidity of stator blades, reduces the likelihood of cracking, and improves exhaust properties by maintaining a high blade angle and height while minimizing the length of the cutout, thereby increasing the cost-effectiveness and efficiency of the vacuum pump.
Implementation Method 1
a method of forming by plastic working... a step of forming the blade portions by a predetermined inclination angle by pressing
Data Source
AI summary
A vacuum pump has an exhaust portion in which rotating blade portions and stationary blade portions are laminated in multiple stages. Each of the plurality of stator blades in one stage of the stationary blade portion is three-dimensionally connected to the stationary blade portion main body by an inner circumferential side support portion on the inner circumferential end side, and three-dimensionally connected to the stationary blade portion main body by an outer circumferential side support portion on the outer circumferential end side, and a cutout is provided in ag circumferential front end of the outer circumferential side support portion.