Expansion Pipe Joint Structure for Hot Ash Bellows Protection
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Solution Overview
Problem
Existing expansion pipe joints deteriorate quickly due to contact with high-temperature incineration ash and vibration, leading to premature wear and cracking of the bellows, especially when handling powdery or granular conveyed objects in incineration ash treatment facilities.
Innovation Solution
An expansion pipe joint design featuring an outer tube with a closing member having elasticity, positioned to avoid contact with the conveyed object, and a tapered shape to facilitate object return, along with an intrusion prevention member and internal monitoring system, to extend service life by minimizing physical, chemical, and thermal influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bellows is exposed to high-temperature incineration ash and vibration, then the expansion pipe joint can absorb displacement, but the bellows deteriorates quickly due to heat and friction wear
Solution Approach 1:
The patent introduces an intrusion prevention member as an intermediary component between the conveyed object and the bellows. This member prevents direct contact between the incineration ash and the bellows, thereby eliminating the harmful thermal and mechanical effects while preserving the bellows' displacement absorption function.
Solution Approach 2:
The patent extracts the harmful interaction between the conveyed object and the bellows by removing the direct contact path. The intrusion prevention member is positioned to block the conveyed object from reaching the bellows, effectively separating the harmful elements from the sensitive component.
2Reliability
If the inner tube prevents contact between the bellows and conveyed object, then the bellows is protected, but incineration ash accumulates in the expansion pipe joint when supply exceeds flow
Solution Approach 1:
The closing member acts as an intermediary that selectively blocks incineration ash from entering the gap between the inner tube and outer tube, while allowing the intrusion prevention member to perform its protective function. This prevents accumulation without compromising bellows protection.
3Stability of the object's composition
If the bellows is positioned to absorb vibration and displacement, then connection stability is improved, but resonance occurs during operation stop causing tensile force on the bellows
Solution Approach 1:
The intrusion prevention member provides beforehand protection by preventing incineration ash from contacting the bellows during vibration and resonance events. This cushioning effect eliminates friction wear and thermal damage that would otherwise occur during high-stress resonance conditions.
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 design effectively extends the service life of the expansion pipe joint by preventing contact between the conveyed object and the closing member, reducing wear and deterioration, and allowing for monitoring without disassembly.
Implementation Method 1
a closing member having elasticity that is provided between an upstream end of the outer tube and the upstream end of the inner tube so as to close a gap between them
Implementation Method 2
an expansion pipe joint that absorbs displacement occurring at a connection portion between an upstream pipe and a downstream pipe
Data Source
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AI summary
An expansion pipe joint that absorbs displacement occurring at a connection portion between an upstream pipe and a downstream pipe includes an outer tube having a downstream end coupled to the downstream pipe, an inner tube that is inserted into the outer tube and has an upstream end coupled to the upstream pipe, and a closing member having elasticity that is provided between an upstream end of the outer tube and the upstream end of the inner tube so as to close a gap between them. Then, a difference between a position in an axial direction of the upstream end of the outer tube and a position in the axial direction of the upstream end of the inner tube is within a predetermined range so that a bus line of the closing member is inclined from the axial direction.