Wound Heat Exchanger Tube Bundle Decoupling for Shear-Free Winding
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Solution Overview
Problem
The cohesion of tube bundles in wound heat exchangers is compromised due to shear loads generated by the deflection of the core tube during the winding process, leading to potential damage and risk of the bundle opening, as existing methods rely on friction locks and prestressing that can rupture.
Innovation Solution
The use of first and second guide arms fixed to the core tube in a radial direction, allowing for axial displacement of webs and maintaining radial cohesion, thereby preventing the tube bundle from coming apart and allowing for thrust movements to maintain a rigid connection between tubes and webs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the core tube and tube bundle are rigidly coupled during winding, then the tube bundle maintains structural integrity, but shear loads cause bracket rupture and bundle opening
Solution Approach 1:
The guide arms are designed to be displaceable relative to the core tube, allowing the coupling mechanism to transition from rigid to flexible. This dynamic adjustment enables the system to accommodate deflection differences between the core tube and tube bundle during winding, preventing bracket rupture while maintaining structural integrity.
Solution Approach 2:
The coupling mechanism changes its physical state from a rigid fixed connection to a flexible displaceable connection during the winding process. This parameter change allows the system to absorb shear loads through controlled movement rather than rigid resistance, preventing bracket failure.
2Ease of manufacture
If the core tube deflects during winding, then the winding process can accommodate tube bundle geometry, but relative movement causes shear load and bracket failure
Solution Approach 1:
The guide arms provide a dynamic coupling that allows controlled relative movement between the core tube and tube bundle during winding. This enables the core tube to deflect and adapt to tube bundle geometry while the guide arms accommodate the movement, preventing shear load accumulation that would cause bracket failure.
Solution Approach 2:
The guide arms act as an intermediary mechanism between the core tube and tube bundle, mediating the relative movement that occurs during winding. This intermediary allows the core tube to deflect for manufacturing ease while preventing direct transmission of shear loads to the brackets.
3Stability of the object's composition
If brackets provide rigid connection between tubes and webs, then structural cohesion is maintained, but relative movement causes play and damage
Solution Approach 1:
The guide arms create a dynamic system that allows controlled movement during winding while maintaining cohesion. This prevents the formation of play and damage by accommodating relative movements that would otherwise cause structural failure.
Solution Approach 2:
The displaceable guide arm mechanism provides beforehand cushioning by accommodating relative movements between the core tube and tube bundle before these movements can cause bracket rupture or bundle opening. This preventive mechanism ensures damage-free operation.
Data Source
AI summary
The invention relates to a device (1) for use in the production of a tube bundle (3) of a wound heat exchanger (100), wherein tubes (30) are wound in a plurality of tube layers (4) onto a core tube (300) running in an axial direction (z), webs (10) which run in the axial direction (z) being arranged between the tube layers (4). The invention further relates to a method for producing a tube bundle using said device (1).