Heat Exchanger Straight-Edge Shell Sealing for Brazed Headers
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Solution Overview
Problem
Existing heat exchangers face challenges in preventing leakage of cooling fluids at the connecting zones between components, which compromises the sealing integrity and efficiency of the heat exchange process.
Innovation Solution
The design incorporates a shell with longitudinal ends having a straight edge for planar surface contact with header plates in a perpendicular plane, and protuberances to reinforce sealing, ensuring secure connections and minimizing fluid leakage through brazing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional connecting zones between shell and header plates are used, then assembly is simpler, but sealing integrity deteriorates due to leakage zones
Solution Approach 1:
The shell end is designed with a curved surface that complements the spherical or rounded contour of the header plate outer surface. This curved-to-curved contact geometry ensures continuous surface contact across the entire interface, eliminating leakage zones while maintaining reliable sealing under thermal and pressure conditions.
Solution Approach 2:
The connecting zone design accommodates thermal expansion and contraction dynamics of the shell and header plates. The curved surface contact allows for dynamic adjustment of the contact interface during temperature variations, maintaining sealing integrity without requiring overly complex constraint mechanisms.
2Manufacturing precision
If header plates are not firmly positioned before brazing, then assembly is faster, but manufacturing precision deteriorates due to misalignment
Solution Approach 1:
The shell end is designed to engage with the header plate before the brazing operation, establishing the correct position and orientation through the curved surface contact. This preliminary positioning action ensures that when brazing begins, the components are already aligned, eliminating the need for complex alignment procedures during the brazing process itself.
Solution Approach 2:
The design incorporates a tolerance buffer in the curved surface contact geometry that accommodates minor dimensional variations in the header plates. This beforehand cushioning effect ensures that even with normal manufacturing tolerances, the header plates will be firmly positioned and aligned correctly before brazing, preventing misalignment issues.
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 enhances the sealing of the heat exchanger, preventing fluid leaks and maintaining efficient heat exchange by ensuring tight contact and secure assembly of components during brazing.
Implementation Method 1
the shell has at least one longitudinal end with a straight edge configured to be in planar surface contact with at least one header plate in a contact zone
Implementation Method 2
the heat-exchange core being configured to allow an exchange of heat between the fluids when they cross in the heat exchanger
Implementation Method 3
the cooling fluid circulates through the heat-exchange core, between the tubes, and thus contributes to the cooling of the gases circulating in the tubes
Implementation Method 4
ensuring secure connections and minimizing fluid leakage through brazing operations
Data Source
AI summary
The main object of the invention is a heat exchanger including a first header plate of an inlet manifold, a second header plate of a distribution header and a heat exchange core bundle extending between the first header plate and the second header plate along a longitudinal direction, the heat exchange core bundle being defined by a shell and having a plurality of tubes arranged successively next to each other in a transverse direction, each tube being capable of cooperating with the header plates via through-holes formed in each plate. The shell has at least one longitudinal end with a straight edge configured to be in flat surface contact with at least one header plate in a contact area, the surface contact occurring mainly in a plane perpendicular to the longitudinal direction.