Buoyant Ceramic Foam Filter for Molten Metal Pump
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing molten metal filters are often semi-permanently cemented in place, requiring increased maintenance time for replacement and are prone to breaking, leading to inclusions in the molten metal and damage to pumping equipment.
Innovation Solution
A molten metal pump filter made of ceramic foam material with a buoyant density less than the pump base, optionally using an expandable gasket to retain it in place, allowing for easy replacement without cementation, reducing maintenance time and preventing filter breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filters are semi-permanently cemented in place, then filter stability is improved, but maintenance time increases and filter replacement becomes difficult
Solution Approach 1:
The filter is designed as a separate, removable component from the pump housing, allowing it to be segmented into distinct parts that can be easily detached and replaced without affecting the entire pump assembly. This segmentation enables quick filter replacement while maintaining operational reliability.
Solution Approach 2:
The filter incorporates an expandable gasket that changes state from compressed to expanded as temperature increases, dynamically adapting its retention force. This dynamic behavior allows the filter to be easily installed at room temperature and securely retained during hot operation, facilitating quick replacement while ensuring stability during use.
2Stability of the object's composition
If filters are cemented in place, then filter position stability is improved, but filter breakage risk increases leading to inclusions in molten metal
Solution Approach 1:
The gasket material's physical parameters change with temperature - it is soft and compressible at room temperature for easy installation, then expands and hardens at operating temperature to provide secure retention. This parameter change eliminates the need for cementation while maintaining position stability and reducing breakage risk.
Solution Approach 2:
The filter assembly uses composite construction with ceramic foam filter media combined with a specialized gasket material that exhibits temperature-dependent properties. This composite design provides both the structural integrity needed for stable positioning and the flexibility required to prevent breakage during handling and installation.
3Strength
If filters are made of dense material, then filter strength is improved, but filter replacement time increases due to system cooling requirements
Solution Approach 1:
The gasket transitions from a soft, compliant state during installation to an expanded, rigid state during operation. This dynamic transformation allows the filter to be easily handled and installed when cool, then securely held in place during hot operation without requiring system shutdown or cooling for replacement.
Solution Approach 2:
The gasket material is specifically selected to undergo thermal expansion when heated by the molten metal, causing it to expand and firmly secure the filter in place. This thermal expansion mechanism provides strong retention during operation while allowing easy installation at lower temperatures, eliminating the need to cool the system for filter replacement.
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
Enables quick and efficient replacement of filters without cooling the system, reducing maintenance time and preventing inclusions in the molten metal, thus improving the quality of the final product and extending equipment lifespan.
Implementation Method 1
a ceramic foam material which has a density less than the material used to make the pump base in which it is positioned, and which is buoyant in molten aluminum
Implementation Method 2
an expandable gasket attached to the filter, wherein the gasket is configured to expand when heated to help retain the filter in the pump chamber of the pump base
Data Source
AI summary
The invention relates to filtering molten metal and more particularly, to a pump, pump base and filter for filtering molten metal, wherein the filter is preferably comprised of a ceramic foam material. The ceramic foam material may be buoyant in molten aluminum. In one embodiment, a molten metal pump includes a pump base configured to receive the molten metal pump filter without using cement.