Vacuum Pump Assembly Zoning for By-Product Storage and Anti-Jamming
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Solution Overview
Problem
Conventional vacuum pumps suffer from insufficient process by-product holding capacity, leading to adhesion of powders on rotor and casing surfaces, causing jamming and reduced service life, especially in environments with large volumes of process by-products.
Innovation Solution
The vacuum pump assembly incorporates storage grooves on non-critical surfaces of rotor elements and casings to enhance process by-product holding capacity, preventing adhesion and jamming by ensuring gas flow efficiency and optimizing rotor and casing designs to accommodate more by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the interstices between rotors and between rotors and casing are kept narrow (0.02 mm) to maintain sealing performance, then gas pumping efficiency is improved, but process by-product powders adhere to surfaces and occupy interstices, causing wear and jamming
Solution Approach 1:
The pump chamber is segmented into multiple functional zones: a first pump chamber for gas pumping and a second pump chamber for process by-product storage. This segmentation allows the narrow interstices in the first chamber to maintain sealing and pumping efficiency, while the second chamber provides dedicated space for by-products, preventing them from occupying the critical interstices and causing jamming.
Solution Approach 2:
A partition wall is introduced as an intermediary structure between the first pump chamber and the second storage chamber. This partition prevents process by-product powders from entering the first pump chamber where they would adhere to rotor surfaces and occupy narrow interstices, thereby maintaining reliable operation while still enabling gas pumping.
2Quantity of substance
If storage grooves are added to rotor elements and casings to increase process by-product holding capacity, then by-product accumulation is improved, but device complexity increases
Solution Approach 1:
The pump chamber is divided into a first pump chamber for gas handling and a second storage chamber for by-products. This segmentation allows storage grooves to be added in the second chamber without affecting the first chamber's pumping function, increasing by-product holding capacity while maintaining relatively simple rotor and casing structures in the active pumping zone.
Solution Approach 2:
Storage grooves are added locally to the second pump chamber and casing portions that contact process by-products, rather than modifying the entire rotor and casing structure. This localized modification increases by-product holding capacity while minimizing the increase in overall device complexity.
Data Source
AI summary
Disclosed is a vacuum pump assembly with an improved process by-product holding capacity, including a front bearing plate (1), an upper casing (2), a lower casing (3), a long rotor (4), a short rotor (5), and a rear bearing plate (6); the long rotor (4) and the short rotor (5) rotate about their respective rotary shafts in opposing directions, axes of the rotary shafts of the long rotor (4) and the short rotor (5) being set parallel to each other; the multiple stages of rotor elements of the long rotor (4) and the multiple stages of rotor elements of the short rotor (5) mesh with one another correspondingly; storage grooves (43, 54) are set on non-critical surfaces of rotor elements when meshing with one another. The disclosure improves process by-product holding capacity and effectively prevents pump jamming and wear caused by adhesion of the process by-product.