Compressor Piston Sealing Assembly for Even Wear Distribution
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Solution Overview
Problem
Conventional sealing rings in reciprocating compressors experience rapid wear at the protruding element, leading to a loss of sealing capacity and frequent replacements due to uneven wear distribution and lack of angular orientation, which shortens their operational life.
Innovation Solution
A piston with a sealing assembly comprising multiple sealing elements of complementary shapes, made from materials like carbon-filled polytetrafluoroethylene or boron nitride, that are designed to distribute wear evenly and include a check hole for indicating when maintenance is needed, ensuring a longer operational life and improved sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealing ring with a protruding element is used, then the sealing capacity is maintained initially, but the protruding element wears rapidly leading to loss of sealing capacity and frequent replacements
Solution Approach 1:
The sealing ring is divided into multiple independent sealing elements (first sealing element, second sealing element, third sealing element) that can wear independently. This segmentation prevents the rapid failure of the entire seal due to wear of a single protruding element, thereby extending operational life while maintaining sealing capacity.
Solution Approach 2:
Different sealing elements are positioned at specific locations around the piston circumference to address wear patterns locally. The first sealing element is positioned to handle high-wear areas, while other elements provide backup sealing, ensuring reliable sealing capacity is maintained even when some elements wear.
2Device complexity
If a conventional sealing ring is used, then the structure is simple, but wear cannot be distributed evenly leading to frequent replacements
Solution Approach 1:
The sealing ring is segmented into multiple independent sealing elements that can be distributed around the piston circumference. This allows wear to be distributed across multiple elements rather than concentrated at a single protruding element, extending operational life while maintaining relatively simple structure.
Solution Approach 2:
The sealing elements are designed to move and adjust dynamically during piston operation, allowing them to distribute wear more evenly across their surfaces and across different elements, thereby extending operational life without significantly increasing structural complexity.
3Device complexity
If a conventional sealing ring without angular orientation capability is used, then the structure is simple, but wear load cannot be distributed in predefined areas
Solution Approach 1:
The sealing elements are positioned asymmetrically around the piston circumference at specific angular orientations. This asymmetric arrangement allows wear load to be distributed to predefined areas that are more resistant to wear, improving reliability by preventing concentrated wear at critical locations while maintaining simple structure.
4Device complexity
If a single sealing element is used, then the structure is simple, but the seal fails when wear damages the protruding element
Solution Approach 1:
The sealing assembly is segmented into multiple sealing elements that work together to provide redundant sealing. If one element wears or fails, the other elements continue to provide sealing capacity, significantly improving reliability while keeping the overall structure relatively simple.
Solution Approach 2:
The multiple sealing elements provide a form of beforehand cushioning against seal failure. The redundant elements ensure that even if wear damages one element, the sealing capacity is maintained, preventing catastrophic seal failure and extending the operational life of the sealing assembly.
Data Source
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AI summary
A piston (10) is described for the compression of a pneumatic fluid in a compression chamber (CC) of a cylinder (C) comprising: - a cylindrically shaped piston body (12), adapted to be arranged slidably within said cylinder (C), and having a side wall (16) and a top wall (18); along a circumferential perimeter (20) of said side wall (16) of the piston body (12) a seat (22) being defined; and - a sealing assembly (14) accommodated in said seat (22), and adapted to ensure the fluid-tightness along said circumferential perimeter (20); the sealing assembly (14) comprising a plurality of sealing elements (24, 24'), having shapes complementary to one another, and configured so that the wear of a sealing element (24, 24') along said circumferential perimeter (20) corresponds to a sliding in the radially outer direction of the adjacent sealing element (24', 24).