Telescopic Vacuum Tube With Closed Suction Channel
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Solution Overview
Problem
Telescopic pipe systems for vacuum cleaners suffer from reduced suction force due to secondary air entry through numerous openings and turbulence caused by the cable duct, leading to uneven airflow.
Innovation Solution
A telescopic pipe system with an essentially closed suction channel and separate cable routing, where the outer and inner suction pipes form a telescopic envelope channel with minimal connection points, ensuring air and cable flow independently, and using a circular suction channel with no projections to maintain uniform airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed cable duct completely surrounds the cable within the suction duct, then the cable is protected from dirt and damage, but the suction channel develops numerous openings and connecting points that allow secondary air to enter, reducing suction force
Solution Approach 1:
The patent divides the pipe system into functionally independent segments: the suction channel and the cable duct are separated as distinct components. The suction channel has minimal openings only where absolutely necessary, while the cable duct is integrated within the suction channel structure rather than being a separate surrounding enclosure, thus avoiding the creation of multiple connection points that would compromise suction performance.
Solution Approach 2:
The cable duct is nested within the suction channel structure rather than completely surrounding it. The cable runs through a designated path inside the suction channel, protected by the channel walls themselves, eliminating the need for a separate enclosing cable duct that would require multiple openings and connecting points.
2Reliability
If the cable duct completely surrounds the cable, then the cable is protected from damage, but the cable duct causes turbulence within the suction duct leading to uneven airflow
Solution Approach 1:
The cable is extracted from the turbulent airflow path by routing it along the inner wall of the suction channel in a protected groove or channel. This removes the cable from the main airflow, eliminating the turbulence that would be caused by a surrounding cable duct while still providing protection through the structured routing path.
Solution Approach 2:
The cable protection is provided locally along the wall of the suction channel rather than through a complete surrounding duct. The cable is embedded in or protected by a localized structure within the suction channel, maintaining smooth airflow in the central region while providing adequate protection where the cable is positioned.
3Ease of operation
If the suction channel has numerous openings and connecting points for the cable duct, then the cable can be routed, but secondary air enters through these openings decreasing suction force
Solution Approach 1:
The cable routing function is merged with the suction channel structure itself. The suction channel walls incorporate grooves, channels, or recesses that guide and protect the cable, eliminating the need for separate cable duct openings. The cable passes through the structure at minimal connection points that are sealed or designed to prevent secondary air entry.
Data Source
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AI summary
The system (1) has a casing inner tube (2) exhibiting a reduced cross section than a casing outer tube (3) so that the casing inner tube and the casing outer tube form a telescopic casing channel (6). A suction inner tube (4) is arranged in the casing channel, where a cable (5) i.e. spiral cable, is guided within the casing channel. A suction outer tube (7) and the suction inner tube form a closed suction channel (8) within the casing channel, where length of the suction channel corresponds to length of the casing channel. Semi-shell elements (14, 15) are designed in a telescopic manner.