Ceramic Foam Filter Box Using Vacuum Priming
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Solution Overview
Problem
Ceramic Foam Filters (CFF) face challenges in initiating metal flow due to their fine pores, requiring deep filter boxes and gravitational force, which complicates the filtration process and is inefficient, especially when switching between different filter sizes for varying metal quality needs.
Innovation Solution
A flexible CFF box design that operates under pressure, allowing for single or double filter configurations, enabling efficient priming and operation by adjusting the partition walls and dam positions to manage metal flow and pressure, thereby optimizing filter usage and reducing operational costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If deep filter boxes are used to generate sufficient metal head by gravitation to force metal through the filter, then the filter can be primed and metal flow can be initiated, but the device complexity and operational inefficiency increase
Solution Approach 1:
The patent inverts the conventional approach by using underpressure (vacuum) to lift metal through the filter instead of using gravity to force metal down through the filter. This is achieved by creating a pressure difference where the pressure below the filter is lower than the pressure above the filter, causing metal to rise through the filter medium. This inversion eliminates the need for deep filter boxes while achieving effective priming and continuous operation.
Solution Approach 2:
The patent applies pneumatic principles by using a vacuum pump or ejector to create underpressure in the filter box. This pressure differential (hydraulic principle) lifts the metal melt through the filter without requiring gravitational head from deep boxes. The pneumatic system controls the metal flow by adjusting the vacuum level, enabling both priming and continuous filtration operation.
2Manufacturing precision
If ceramic foam filters with fine pores are used for effective inclusion removal, then metal quality improves, but the difficulty of initiating metal flow through the filter increases
Solution Approach 1:
The patent inverts the flow direction and driving force: instead of forcing metal down through fine pores using gravity (which requires deep boxes and is difficult to initiate), it lifts metal up through the fine pores using underpressure. This inversion makes priming easier because the underpressure system can overcome the capillary resistance of fine pores more effectively than gravitational force alone.
Solution Approach 2:
The patent changes the pressure parameter from positive pressure (gravity-driven) to negative pressure (vacuum-driven). This parameter change enables the system to effectively prime filters with fine pores by creating a strong pressure differential that overcomes the capillary pressure resistance, while maintaining the fine pore structure needed for high metal cleanliness.
3Device complexity
If a fixed filter configuration is used, then the apparatus structure is simplified, but the adaptability to different metal quality needs and filter sizes is reduced
Solution Approach 1:
The patent segments the filter box into multiple independent chambers (e.g., two or more filter chambers) that can be independently configured and operated. Each chamber can accommodate different filter sizes and types, allowing the system to adapt to different metal quality requirements. The segmentation also enables flexible arrangement of inlet and outlet channels to match various operational needs.
Solution Approach 2:
The patent introduces dynamic elements such as movable partition walls and adjustable dam positions that can be reconfigured during operation or between casts. This dynamic capability allows the same apparatus to accommodate different filter configurations (single filter mode, dual filter mode, different chamber arrangements) without requiring multiple fixed structures, thus maintaining simplicity while achieving versatility.
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 flexible design enhances filter priming efficiency, reduces operational costs by allowing single-mode operation for standard products, and minimizes the need for frequent filter changes, resulting in significant cost savings while maintaining high metal quality.
Implementation Method 1
By lifting the metal with the use of underpressure in the filter box it is possible to avoid drainage of metal after the cast has been finished
Implementation Method 2
apparatus and a method for applying ceramic foam filters for the removal of unwanted inclusions from metal melts by filtration
Implementation Method 3
It is therefore generally known to use deep filter boxes to generate sufficient metal head by gravitation to force the metal through the filter
Data Source
AI summary
Apparatus and method for filtering molten metal including a container with a removable lid to keep the container sealed during operation, the container having an inlet chamber having an inlet opening receiving metal from a metal supply launder and outlet chamber with outlet opening connected to a launder segment. The container having a partition wall between the inlet chamber and outlet chamber and a ceramic foam filter mounted in the outlet chamber. The inlet chamber and outlet chamber being provided within the container and split by the partition wall. The container being connected in parallel with the metal supply launder via stubs. The launder being provided with a dam or valve device downstream the outlet of the container and another dam or valve device between the said launder stubs. Inside the container there is further arranged a second outlet chamber with a filter.