Stator Disc Aperture Variation for Vacuum Pump Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vacuum pumps experience locally high-pressure regions near the distal end of the spiral plate, leading to potential deposition of reaction products, which can reduce maintenance cycles.
Innovation Solution
The design incorporates a stator disc with a higher aperture ratio on the outer peripheral region than the inner peripheral region, featuring various hole configurations such as circular, elongated, T-shaped, and L-shaped holes, to distribute pressure more evenly and reduce high-pressure areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the proportion of hole portions in the stator disc is increased to allow compressed gas to pass through more easily, then gas flow improves, but the exhaust action becomes smaller
Solution Approach 1:
The patent applies local quality by varying the aperture ratio of the stator disc in different regions. The outer peripheral region has a higher aperture ratio to facilitate gas passage, while the inner peripheral region has a lower aperture ratio to maintain compression action. This spatial variation in hole density allows each region to optimize its function: outer regions prioritize gas flow while inner regions prioritize compression, resolving the contradiction between gas flow and exhaust action.
2Power
If both interaction (A) between spiral plate and stator disc and interaction (B) between spiral plate and casing occur simultaneously near the distal end, then compression action is significantly strong, but a locally high-pressure part is created
Solution Approach 1:
The patent addresses the local pressure issue by implementing a non-uniform aperture ratio distribution in the stator disc. The outer peripheral region has a higher aperture ratio that reduces resistance to gas flow, preventing excessive pressure buildup in regions where both compression interactions occur simultaneously. This local variation in structural properties allows the system to maintain strong compression action while avoiding harmful localized high-pressure zones.
3Power
If high pressure is generated in the vacuum pump, then gas compression is effective, but reaction products may be deposited
Solution Approach 1:
The patent prevents deposition of reaction products by implementing local quality variation in the stator disc aperture ratio. In regions where strong compression action occurs (which could generate high pressure leading to deposition), the higher aperture ratio in the outer peripheral region reduces local pressure buildup. This ensures that gas compression remains effective overall while local pressure is controlled to prevent the formation and deposition of reaction products.
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 configuration effectively reduces the occurrence of locally high-pressure regions, minimizing the risk of gas reaction products deposition and extending the maintenance cycle of the vacuum pump.
Implementation Method 1
a gas transfer mechanism configured to transfer gas sucked from the inlet port toward the outlet port by interaction between the spiral plate and the stator disc
Data Source
AI summary
In a vacuum pump, the proportion of hole portions at a distal end (outer peripheral side/outer peripheral portion) of a stator disc is locally increased. More specifically, hole portions of substantially the same size are provided in parallel from the inner peripheral side to the outer peripheral side of the stator disc, and the number of hole portions provided in the outermost row is set to be larger than the number of hole portions provided in an inner row. Hole portions of substantially the same size are provided in parallel from the inner peripheral side to the outer peripheral side of the stator disc, and some of hole portions provided in the outermost row are integrated to be a single hole portion. T shaped hole portions are provided in the stator disc. L shaped hole portions are provided in the stator disc.