Lining Drum End-Piece Venting for Pressure Relief
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Solution Overview
Problem
Existing lining drums for pipeline renovation are prone to dangerous pressure buildup, which can lead to explosions despite multiple safety features, as the pressure relief mechanisms can be blocked by a tangled liner.
Innovation Solution
A low-pressure lining drum with a spring-loaded expansion mechanism in the end pieces that creates a pressure relief gap when air pressure exceeds a predetermined limit, ensuring safe operation by allowing air to leak out and preventing excessive pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional welding construction is used for lining drums, then structural strength is improved, but safety against pressure buildup deteriorates because the rigid structure prevents pressure relief
Solution Approach 1:
The end piece is designed to move dynamically relative to the tubular body through a sliding connection with guide rails. When internal pressure exceeds a predetermined threshold, the end piece automatically displaces to create a pressure relief gap, allowing pressure to equalize. This dynamic mechanism maintains structural integrity during normal operation while providing automatic pressure relief when needed, resolving the contradiction between strength and safety.
2Reliability
If pressure regulator is added between air compressor and lining drum, then safety against excessive pressure is improved, but device complexity increases
Solution Approach 1:
The end piece automatically performs pressure regulation and relief functions through its own displacement mechanism when internal pressure exceeds the predetermined threshold. This self-service capability eliminates the need for external pressure regulators, safety valves, or other additional safety devices, thereby maintaining safety while reducing device complexity.
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 effectively prevents dangerous pressure buildup, making the device safer to use by ensuring that the pressure relief mechanism cannot be blocked by the liner, thereby preventing potential explosions.
Implementation Method 1
at least one of the end pieces has a spring-loaded expansion mechanism that allows the end piece to expand radially outward when the air pressure inside the lining drum exceeds a predetermined limit
Implementation Method 2
defining a pressure relief gap between the expanded end piece and the tubular body. The pressure relief gap allows air to leak out from the lining drum when the air pressure inside the lining drum exceeds a predetermined limit
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A lining drum (10) which has a tubular body (20) having open ends, an inlet (22) for compressed air and an outlet (23) for liner (60) is disclosed. The lining drum (10) has end pieces (31, 32) removably attached to the tubular body (20) for closing the open ends of the tubular body (20), a rotatable shaft (51) inside the tubular body (20) and a crank (33) for rotating the shaft (51). The end piece (31, 32) has a spring-loaded flange mounting, wherein bias of springs (41) pushes the flange mounting towards the tubular body (20) and a closed position of the flange mounting, and air pressure inside the lining drum (10) pushes the flange mounting away from the tubular body (20) and towards an open position of the flange mounting.