Spring-Loaded Nozzle with Wheels for Cylindrical Filter Screen Backwash
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Solution Overview
Problem
Existing backwash arrangements for cylindrical filter screens face challenges in achieving close proximity to the screen without increasing wear and friction, leading to inefficiencies in the cleaning process and reduced system lifetime.
Innovation Solution
A backwash arrangement featuring a spring-loaded nozzle with wheels for rolling engagement and a helical motion linkage, allowing for precise and efficient contact with the filter screen while minimizing friction, and incorporating a ramp surface to facilitate particle entry and reduce obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spring-loaded nozzles are used to press against the screen to achieve close proximity, then cleaning effectiveness is improved, but friction and wear increase reducing system lifetime
Solution Approach 1:
The patent introduces wheels as an intermediary element between the nozzle and the filter screen. The wheels roll along the screen surface, mediating the contact between the nozzle assembly and the screen. This allows the nozzle to maintain close proximity for effective cleaning while the rolling motion significantly reduces friction and wear compared to direct sliding contact, thereby extending system lifetime
Solution Approach 2:
The patent replaces the traditional sliding friction-based contact mechanism with a rolling contact mechanism using wheels. This substitution transforms the mechanical interaction from high-friction sliding to low-friction rolling, maintaining cleaning effectiveness while dramatically reducing wear on both the nozzle assembly and the filter screen
2Productivity
If the suction nozzle is positioned close to the filter screen to improve cleaning ratio, then cleaning effectiveness is improved, but difficulty in maintaining position increases due to screen shape variations
Solution Approach 1:
The patent employs a spring-loaded nozzle assembly that can dynamically adjust its position. The spring mechanism allows the nozzle to maintain constant contact with the filter screen surface despite variations in the screen's cylindrical shape and tolerances. This dynamic adjustment capability ensures the nozzle remains optimally positioned for cleaning while accommodating manufacturing variations without requiring precise fixed positioning
Solution Approach 2:
The patent utilizes the spring mechanism to change the positional parameter of the nozzle dynamically. By allowing the nozzle to move along the spring's compression range, the system adapts to varying screen geometries and maintains optimal cleaning proximity despite dimensional variations in the filter screen
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
The solution enables efficient debris removal with reduced friction and wear, maintaining system efficiency and extending the lifespan of components by achieving close proximity to the filter screen without excessive wear.
Implementation Method 1
a spring-loaded nozzle arrangement associated with each of the radial branch conduits, the spring-loaded nozzle arrangement being biased into contact with the cylindrical filter screen
Implementation Method 2
a pair of wheels deployed on opposing sides of the nozzle opening and deployed for rolling engagement with the cylindrical filter screen
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A backwash arrangement for cleaning a cylindrical filter screen includes a cylindrical filter screen within which extends an axial central conduit. A number of radial branch conduits extend outwards from the central conduit towards the cylindrical filter screen, each provided with a spring-loaded nozzle arrangement. The spring-loaded nozzle arrangement is biased into contact with the cylindrical filter screen, and includes a nozzle opening for passing across the cylindrical filter screen, and a pair of wheels deployed on opposing sides of the nozzle opening for rolling engagement with the cylindrical filter screen.