Roots Pump Rotor Distal End Segmentation for Foreign Substance Capture
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Solution Overview
Problem
Existing roots pumps face challenges in preventing damage from foreign substances while maintaining efficient fluid handling, as larger radial clearances to accommodate foreign substances lead to increased fluid leakage, degrading pump performance.
Innovation Solution
The roots pump design incorporates a pair of rotors with distinct radial clearances: a first radial clearance between the rotor peripheral surfaces and the rotor chamber surface to minimize fluid leakage, and a second, larger radial clearance at the distal end to capture foreign substances, creating a labyrinth effect that prevents damage and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radial clearance is larger than the foreign substance to prevent damage, then the reliability is improved, but the leakage amount of fluid increases which degrades pump performance
Solution Approach 1:
The rotor distal end portion is segmented into multiple surfaces: rotor peripheral surfaces for sealing (first radial clearance) and a distal end peripheral surface for capturing foreign substances (second radial clearance). This segmentation allows different regions to serve different functions, resolving the contradiction between preventing damage and minimizing leakage.
Solution Approach 2:
Different radial clearances are applied to different locations on the rotor distal end portion. The rotor peripheral surfaces have a first radial clearance optimized for sealing, while the distal end peripheral surface has a second radial clearance larger than the foreign substance. This local differentiation allows each region to optimize its function without compromising the other.
2Productivity
If the radial clearance is smaller to prevent fluid leakage, then the pump performance is improved, but foreign substances larger than the clearance cause damage when bitten between the rotor and housing
Solution Approach 1:
The rotor distal end portion is divided into sealing surfaces (rotor peripheral surfaces with first radial clearance) and a foreign substance capture surface (distal end peripheral surface with second radial clearance). This segmentation allows the pump to maintain high sealing performance while providing a safe zone for foreign substances.
Solution Approach 2:
The distal end peripheral surface acts as an intermediary element between the sealing region and the housing. It provides an intermediate zone with larger clearance that captures foreign substances before they can reach the critical sealing interfaces, preventing damage without significantly impacting pump performance.
Data Source
AI summary
A roots pump includes a housing, a rotor chamber, a pair of rotary shafts, and a pair of rotors. The rotor chamber includes a rotor chamber peripheral surface facing a pair of distal end portions of each of the rotors. Each of the pair of the distal end portions includes: a pair of rotor peripheral surfaces facing the rotor chamber peripheral surface with a first radial clearance; and a distal end peripheral surface that is formed between the pair of the rotor peripheral surfaces in the rotational direction and faces the rotor chamber peripheral surface with a second radial clearance greater than the first radial clearance. A width of the rotor chamber peripheral surface facing the distal end peripheral surface in the rotational direction is greater than a sum of a pair of predetermined widths of the rotor chamber peripheral surface facing the pair of the rotor peripheral surfaces.