Molded parts and methods of manufacture
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Solution Overview
Problem
Existing condensate collection systems in refrigeration systems, such as HVAC systems, face inefficiencies in condensate water management due to the need for separate molding processes and thicker liners, which increase manufacturing costs and sound transmission.
Innovation Solution
A single-shot molding process for a condensate drain pan using an expanded porous polymeric substrate with a crystallized layer, where the mold fuses and crystallizes the material to create a waterproof and insulating pan with a thin liner, reducing material consumption and sound transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate waterproof and insulating layers are used with a two-step molding process, then water tightness and thermal insulation are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the waterproof liner and insulating layer into a single integrated component made from expanded porous polymeric substrate. The substrate inherently provides both water resistance and thermal insulation properties, eliminating the need for separate layers and the complex two-step molding process while maintaining the required functionality.
Solution Approach 2:
The patent uses expanded porous polymeric substrate as a composite material that integrates multiple functions (waterproofing and insulation) into a single material system. The expanded porous structure provides both the necessary water tightness and thermal insulation properties that previously required separate materials and assembly steps.
2Reliability
If thicker liners are used to ensure water tightness, then reliability is improved, but material consumption and sound transmission increase
Solution Approach 1:
The patent employs expanded porous polymeric substrate where the controlled porous structure provides water resistance through surface tension effects rather than requiring thick solid material. The porosity is optimized to maintain water tightness while using minimal material, thereby reducing both material consumption and sound transmission compared to traditional thicker liners.
Solution Approach 2:
The patent changes the physical parameters of the polymeric material by expanding it into a porous structure with specific cell sizes and distributions. This parameter change allows the material to achieve water tightness through capillary pressure and surface tension in the porous structure rather than relying on material thickness, thus reducing overall material consumption.
3Temperature
If separate waterproof and insulating layers are used, then thermal insulation is improved, but sound transmission increases
Solution Approach 1:
The expanded porous polymeric substrate acts as an acoustic damper due to its cellular structure. The porous network absorbs and dissipates sound energy through friction and viscous effects within the pores, thereby reducing sound transmission while maintaining thermal insulation properties. This eliminates the sound transmission issue associated with separate layered constructions.
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 reduces manufacturing costs and sound transmission while maintaining water tightness and ease of manufacture, offering a drop-in replacement for existing systems with improved performance.
Implementation Method 1
the mold fuses and crystallizes the material to create a waterproof and insulating pan
Implementation Method 2
may have sufficient thermal insulation to avoid the cool condensate chilling the outside of the pan
Data Source
Figure 1
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Figure 3
AI summary
A condensate drain pan (20) has a porous expanded polymeric substrate (80) and a crystallized polymeric layer (82) atop the substrate.