Vacuum Pump Rotor Grooves for By-Product Jamming Prevention
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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, while maintaining gas pumping efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the interstices between rotors and between rotors and casing are kept narrow (0.02mm) to maintain sealing performance, then gas pumping efficiency is improved, but process by-product powders adhere to the narrow surfaces and occupy the interstices, causing jamming and wear
Solution Approach 1:
The pump chamber is segmented into multiple functional zones: gas pumping areas with narrow interstices for efficient gas transport, and separate storage grooves with larger capacities for process by-products. This segmentation allows the pump to maintain narrow sealing clearances for gas pumping while providing dedicated storage spaces for powders, preventing them from accumulating in the critical gas pumping interstices and causing jamming.
Solution Approach 2:
Storage grooves act as intermediary spaces between the gas pumping chamber and the exhaust system. These grooves temporarily hold process by-product powders, preventing them from directly contacting and adhering to the rotor surfaces and narrow interstices. The grooves serve as a buffer zone that captures powders before they can interfere with the gas pumping function, thereby maintaining both sealing performance and operational reliability.
2Reliability
If storage grooves are added to increase process by-product holding capacity, then powder adhesion and jamming are prevented, but the device complexity increases
Solution Approach 1:
The storage grooves are merged with the existing rotor and casing structures rather than being separate add-on components. The grooves are integrated into the rotor bodies and casing walls, utilizing the same manufacturing processes and materials. This merging approach increases the pump's reliability by adding powder storage functionality while minimizing the increase in device complexity, as no entirely new structural systems are introduced.
Solution Approach 2:
The storage grooves serve multiple functions: they hold process by-product powders, prevent powder adhesion to rotor surfaces, maintain sealing integrity in narrow interstices, and reduce jamming risks. By making these additional spaces multi-functional, the patent achieves enhanced reliability without proportionally increasing complexity, as the same structural elements perform both gas pumping and powder management functions.
Data Source
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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.