One-Piece Metallic Bellows for Pressure Pulsation Damping
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Solution Overview
Problem
Existing accumulators for damping pressure pulsations have complex production processes due to segmented bellows that require welding, leading to uneven flexural rigidity, potential leaks, and reduced service life.
Innovation Solution
A one-piece metallic bellows with a thickness of 0.1 to 0.3 mm, made from materials like stainless steel, eliminates the need for welding and ensures homogeneous flexural rigidity, preventing leaks and allowing for cost-effective, long-lasting operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bellows is made of segmented parts that are welded together, then the production process becomes complex and time-consuming, but the structural integrity and sealing performance deteriorate due to weld seams causing uneven flexural rigidity and potential leaks
Solution Approach 1:
The patent applies the merging principle by transitioning from a segmented bellows structure with multiple weld seams to a one-piece bellows structure. The entire bellows is formed as a single continuous metallic component, eliminating all weld joints. This merging of segments into one unified structure simultaneously simplifies production (by removing welding steps) and improves reliability (by eliminating leak paths at weld seams), directly resolving the technical contradiction.
2Productivity
If the bellows is made of segmented parts requiring welding, then the manufacturing time increases, but the service life decreases due to uneven stress distribution at weld seams
Solution Approach 1:
The one-piece construction merges all bellows segments into a single continuous metallic component, eliminating the need for welding operations. This not only reduces manufacturing time and increases productivity but also ensures uniform stress distribution throughout the structure during operation, preventing premature failure at weld joints and significantly extending the service life of the bellows.
3Manufacturing precision
If weld seams are made as identical as possible to ensure symmetrical deformation, then the manufacturing precision requirements increase and production complexity increases, but the flexural rigidity becomes non-uniform due to welding variations
Solution Approach 1:
By merging the bellows into a one-piece structure, the patent eliminates all weld seams and the associated manufacturing precision challenges. The uniform flexural rigidity is achieved inherently through the continuous metallic construction, where material properties and geometry can be controlled consistently throughout the entire bellows without the variability introduced by welding processes.
4Ease of operation
If the bellows is made from thinner material to allow easier deformation, then the deformability improves, but the pressure resistance decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the metallic layer thickness to a specific range (0.1 to 0.3 mm) that balances deformability and pressure resistance. Additionally, the one-piece construction method fundamentally changes the structural parameters, creating a uniform geometry that distributes stresses evenly throughout the bellows, allowing thinner material to achieve both high deformability and adequate pressure resistance simultaneously.
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 one-piece bellows design provides reliable, long-lasting damping of pressure pulsations with reduced material stress and improved durability, suitable for direct injection systems in vehicles, enhancing engine performance and reducing noise.
Implementation Method 1
the bellows is made of a metallic layer which has a thickness of 0.1 to 0.3 mm... allows the gas volume within the bellows to expand without any problems after it has been compressed
Implementation Method 2
the bellows delimiting a second volume which can be changed by deformation of the bellows
Data Source
Figure 1
Figure 2
AI summary
The accumulator has a housing (1). The housing defined a volume (2), which is absorbed within its bellows (3). The bellows defined another volume (4), which is changed by distortion the bellows. The bellows is formed a piece. The bellows is manufactured from a metallic coating, which has thickness from 0.1 to 0.3 millimeter.