Automatic Flushing Pre-Filter with Movable Rod and Back Flush
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Solution Overview
Problem
Existing automatic flushing type pre-filtering devices are unable to completely remove impurities from the filter net, leading to blockages and increased water pressure, which requires manual detachment or replacement of the filter net, causing inconvenience and potential damage.
Innovation Solution
An automatic flushing type pre-filtering device is designed with a valve head set, filter cartridge set, movable rod piece, and drain valve set, utilizing a tight seal boss and bulge ring for thorough flushing and back flushing, along with a spring and blocking pieces to manage water flow and waste water exit, ensuring effective cleaning and prolonged device life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automatic flushing is implemented without back flushing capability, then the device can operate automatically, but impurities cannot be completely removed from the filter net
Solution Approach 1:
The patent implements back flushing by reversing the water flow direction through the filter net. The valve head switches water flow paths to enable water to flow from the outlet side back to the inlet side, carrying impurities away from the filter net surface. This inversion of flow direction allows complete impurity removal while maintaining automatic operation.
Solution Approach 2:
The patent uses a movable rod piece that can shift positions to dynamically change the sealing state between chambers. The rod moves to switch between normal filtration mode and back flushing mode, enabling the system to adapt its operation automatically. This dynamic mechanism allows the device to alternate between filtering and flushing without manual intervention.
2Device complexity
If the filter net is not flushed properly, then the device structure remains simple, but impurities accumulate and block the filter net
Solution Approach 1:
The patent divides the flushing function into distinct operational phases using separate chambers (first chamber for normal filtration, second chamber for back flushing). The movable rod piece segments the water flow paths, directing water to different chambers based on operational mode. This segmentation enables effective flushing without requiring complex additional structures.
Solution Approach 2:
The valve head is designed to perform multiple functions: normal filtration, back flushing, and waste water discharge. By integrating these functions into a single valve assembly with movable components, the patent achieves effective filter net cleaning without proportionally increasing device complexity. The same valve structure handles both filtration and flushing operations.
3Ease of repair
If manual detachment or replacement of filter net is required, then the device can be maintained, but user convenience is greatly reduced
Solution Approach 1:
The patent implements self-service maintenance through automatic back flushing. The system automatically reverses water flow to clean the filter net without requiring user disassembly or replacement operations. The movable rod piece automatically switches between filtration and flushing modes, and the valve head directs waste water containing impurities to the discharge outlet. This self-cleaning mechanism eliminates manual intervention entirely.
Solution Approach 2:
The patent enables continuous operation by integrating flushing into the normal operational cycle. Rather than requiring separate maintenance停机 periods, the system performs back flushing during scheduled intervals while maintaining water supply. The valve head seamlessly transitions between filtration and flushing modes, ensuring continuous water output without manual intervention or operational interruptions.
4Reliability
If the filter net becomes blocked, then filtration effectiveness is maintained, but water pressure increases and may damage the device
Solution Approach 1:
The patent implements periodic back flushing to prevent filter net blockage. The movable rod piece periodically switches between filtration mode and back flushing mode, creating cycles of cleaning action. This periodic reversal of water flow removes accumulated impurities before they can cause excessive pressure buildup or blockage, maintaining safe operating pressure levels while preserving filtration effectiveness.
Data Source
AI summary
Disclosed is an automatic flushing type pre-filtering device, that includes: a valve head set, a filter cartridge set, a movable rod piece, and a drain valve set. The filter cartridge set includes: a cylinder body; a filter cartridge, disposed in the cylinder body, the filter cartridge includes a filter net rack and a filter net disposed on the filter net rack. A first chamber is formed between the filter cartridge and the cylinder body, and a second chamber is formed inside the filter cartridge. The movable rod piece is provided with a hollow portion inside, and the movable rod piece is disposed in the second chamber. A water separation piece is disposed between the movable rod piece and the filter net rack. A plurality of through holes are disposed on the movable rod piece corresponding to a position of the second chamber.