Welded Disc Stack Assembly for Vibration-Resistant Centrifugal Separation
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Solution Overview
Problem
Centrifugal separators face challenges with disc displacement due to vibration and high rotational velocity, leading to durability issues and increased manufacturing complexity, particularly in environments like crankcase gas separation where oil mist and solid residues are present, affecting engine efficiency and durability.
Innovation Solution
The discs are welded at radially outer portions to form a rigid and durable disc stack, allowing for quick and cost-efficient assembly, using polymeric materials and protruding welding sections that act as spacers for uniform separation spaces, facilitating alignment and compression for a coherent weld.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discs are welded at radially outer portions, then durability and rigidity are improved, but manufacturing complexity increases
Solution Approach 1:
The disc stack is divided into individual discs that are welded at their radially outer portions, creating a modular structure where each disc can be manufactured separately and then assembled through welding at specific locations (outer portions) rather than requiring complex full-disc integration
Solution Approach 2:
The welding is performed at radially outer portions of the discs, transitioning from potential radial or axial welding approaches to circumferential outer portion welding, which simplifies the welding process and improves accessibility while maintaining structural integrity
2Strength
If discs are welded at radially outer portions, then rigidity is improved, but manufacturing time increases
Solution Approach 1:
The discs are prepared with protruding welding sections before assembly, and alignment features are pre-configured on each disc. This preliminary preparation allows for rapid assembly and welding operations, reducing overall manufacturing time despite the added welding step
Solution Approach 2:
Traditional mechanical fastening methods (screws, clips, or interlocking mechanisms) are replaced with welding at radially outer portions, which creates a more rigid and permanent connection that eliminates the need for additional mechanical fasteners and reduces assembly complexity
3Weight of moving object
If polymeric materials are used for discs, then weight is reduced, but welding difficulty increases
Solution Approach 1:
The disc stack uses polymeric materials that combine lightweight properties with weldability through specialized welding sections. These composite-like structures integrate the benefits of polymer materials (low weight, corrosion resistance) with welding capability, overcoming the traditional difficulty of welding plastics
Solution Approach 2:
Protruding welding sections are introduced as intermediary elements on the polymeric discs, providing dedicated welding zones that facilitate joining while maintaining the overall lightweight polymeric structure of the discs
4Manufacturing precision
If welding sections protrude from disc surface, then alignment is improved, but device complexity increases
Solution Approach 1:
The protruding welding sections serve multiple functions: they act as alignment features during assembly, provide the welding surface for joining adjacent discs, and maintain the structural integrity of the disc stack. This multi-functionality reduces the need for separate alignment features and simplifies the overall design
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
This approach provides a lightweight, rigid, and durable disc stack with improved fluid flow characteristics, reducing manufacturing time and costs while ensuring consistent separation performance.
Implementation Method 1
the discs are welded to each other at radially outer portions of the discs
Implementation Method 2
A centrifugal separator comprises a rotor unit rotating at high rotational speeds to generate centrifugal forces separating the fluids having different densities
Data Source
AI summary
A disc stack of frustoconical separation discs is configured to be mounted in a separation chamber of a centrifugal separator. The discs are stacked upon each other in a manner forming narrow separation spaces between adjacent discs. The discs are welded to each other at radially outer portions of the discs. A rotor unit for a centrifugal separator, a centrifugal separator including a rotor unit, a method of providing a disc stack of frustoconical separation discs, and a method of providing a rotor unit for a centrifugal separator are also disclosed.