Filter Bag Collapse Cleaning to Prevent Suction Power Loss
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Solution Overview
Problem
Suction devices with flow-permeable filter bags often become clogged with filter cake layers, particularly at the suction inlet, leading to reduced permeability and decreased suction power over time.
Innovation Solution
The filter bag is designed to collapse towards an opposite wall when the suction motor is switched off, causing cracks in the filter cake coating, which detaches and falls off, maintaining suction power by ensuring the outflow filter bag section is free of particles, and incorporating a self-cleaning mechanism through frequent switching on and off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flow-permeable filter bag is used in the suction device, then particle separation is improved, but the filter bag becomes clogged with filter cake layer leading to reduced permeability and decreased suction power
Solution Approach 1:
The suction motor is switched on and off periodically to create pressure differences that cause the filter bag to collapse and expand. This periodic action prevents filter cake buildup by mechanically detaching particles from the filter surface during collapse phases and redistributing them during expansion phases, maintaining continuous particle separation capability without sustained suction power loss
Solution Approach 2:
The filter bag is designed with dynamic collapse capability that allows it to change shape between inflated (during motor operation) and collapsed (during motor off) states. This dynamic behavior enables the filter bag to self-clean by collapsing toward the collection chamber wall, causing filter cake detachment and preventing clogging, thus maintaining both particle separation reliability and suction power
2Reliability
If the filter bag operates continuously, then particle collection is maintained, but filter cake coating accumulates on the outflow filter bag wall section reducing airflow
Solution Approach 1:
The system uses periodic motor switching to create cycles of filter bag inflation and collapse. During collapse phases, the filter bag presses against the collection chamber wall, causing filter cake coating to detach from the outflow section. This periodic mechanical action removes accumulated particles without stopping particle collection, maintaining airflow through the filter bag
Solution Approach 2:
The filter bag performs self-cleaning through its own collapse motion driven by pressure differences when the motor switches off. The collapse causes the filter bag to press against the collection chamber wall, automatically detaching filter cake coating without external intervention. This self-service mechanism maintains airflow while continuous particle collection continues
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
This design maintains the suction power of the suction device over long periods by preventing filter cake buildup, ensuring uninterrupted suction quality through partial or complete detachment of the filter cake coating, reducing undesirable adhesion and maintaining airflow.
Implementation Method 1
the outflow filter bag wall section and/or an outflow filter bag wall surrounding it, for example due to their weight, which is even increased by the adhering filter cake coating, collapses towards an opposite filter bag wall
Implementation Method 2
When the suction motor is then switched on again, the filter bag expediently inflates suddenly
Data Source
Figure 1~4
Figure 2~8
Figure 5~6
AI summary
The method involves arranging a suction motor (12) in a suction cup housing to generate a suction flow, and arranging a collecting chamber (110) in the housing to collect particles separated from the flow. The motor is switched-off, such that a discharging-filter bag-wall section (178) is slumped in the direction of a filter bag-wall (182) that lies opposite to the wall section. The motor is switched-on, such that the wall section is drawn in the direction of a suction outlet (177) by the flow. A filter cake lining (181) is released from the wall section by the slumping of the wall section. An independent claim is also included for a suction device comprising a suction motor and a collecting chamber.