Rotomolded Environmental Control Unit for Reduced Weight and Vibration
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Solution Overview
Problem
Existing environmental control units (ECUs) face challenges in reducing manufacturing costs, improving ruggedness, simplifying maintenance and repair, and minimizing vibration and noise, while also experiencing fatigue in refrigerant plumbing assemblies, which affects reliability and lifespan.
Innovation Solution
The implementation of a rotomolded base structure with interlocking components and a foam-filled core for enhanced structural support, thermal insulation, and vibration damping, along with a dual-shaft motor to drive both indoor and outdoor fans, simplifies assembly and reduces noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional sheet metal, extruded, forged, and punched parts are used in ECU construction, then structural strength is achieved, but weight is increased and manufacturing complexity is heightened
Solution Approach 1:
The patent employs rotomolded polymeric structures that integrate multiple functions into a single composite component. The rotomolded base structure and shroud act as both structural support and vibration-damping elements, eliminating the need for separate sheet metal panels and fasteners. This composite approach reduces weight while maintaining structural integrity through the inherent flexibility and energy-absorbing characteristics of the molded polymeric material.
Solution Approach 2:
The invention merges multiple discrete components (base structure, shroud, vibration dampers, fasteners) into an integrated rotomolded assembly. The base structure and shroud are molded as single pieces that interlock, eliminating the need for separate joining operations. This consolidation reduces part count, simplifies assembly, and decreases overall weight while preserving structural strength.
2Strength
If conventional sheet metal and extruded parts are used, then structural support is provided, but manufacturing cost and fabrication complexity increase
Solution Approach 1:
The rotomolded polymeric components serve as both structural support and vibration-damping elements, eliminating the need for separate sheet metal panels and fasteners. This composite approach reduces weight while maintaining structural integrity through the inherent flexibility and energy-absorbing characteristics of the molded polymeric material.
Solution Approach 2:
The design segments the ECU housing into modular rotomolded components (base structure, shroud) that can be manufactured independently and then assembled through interlocking features. This segmentation allows for simplified manufacturing of each component using rotomolding, reducing overall fabrication complexity and cost compared to traditional multi-step metal forming processes.
3Strength
If traditional rigid structures are used in ECU, then structural integrity is maintained, but vibration and acoustical noise increase
Solution Approach 1:
The patent incorporates vibration-damping material within the rotomolded structure, utilizing the material's ability to absorb and dissipate vibrational energy. The polymeric structure itself provides inherent damping characteristics, and additional damping material can be integrated during the rotomolding process to further reduce vibration and acoustical noise while preserving structural integrity.
Solution Approach 2:
The rotomolded polymeric components serve as both structural support and vibration-damping elements, eliminating the need for separate sheet metal panels and fasteners. This composite approach reduces weight while maintaining structural integrity through the inherent flexibility and energy-absorbing characteristics of the molded polymeric material.
4Strength
If complex assembly of multiple discrete parts is used, then structural support is achieved, but inspection and servicing complexity increases
Solution Approach 1:
The invention merges multiple discrete components (base structure, shroud, vibration dampers, fasteners) into an integrated rotomolded assembly. The base structure and shroud are molded as single pieces that interlock, eliminating the need for separate joining operations. This consolidation reduces part count, simplifies assembly, and decreases overall weight while preserving structural strength.
Solution Approach 2:
The design segments the ECU housing into modular rotomolded components (base structure, shroud) that can be manufactured independently and then assembled through interlocking features. This segmentation allows for simplified manufacturing of each component using rotomolding, reducing overall fabrication complexity and cost compared to traditional multi-step metal forming processes.
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 design reduces manufacturing costs, enhances the ruggedness and reliability of ECUs, simplifies maintenance, and decreases noise and vibration, thereby extending the lifespan of refrigerant plumbing assemblies.
Implementation Method 1
provides a means for filling the hollow rotomolded structural components with a substance to provide a dampening of vibration and reduction of acoustical noise
Implementation Method 2
provide a dampening of vibration and reduction of acoustical noise
Implementation Method 3
a heated hollow mold which is filled with a charge or shot weight of material. The mold is then slowly rotated, causing the softened material to disperse and coat the walls of the mold
Implementation Method 4
the rotomolded structure is strengthened and insulated (thermal and acoustic) by filling the interior void of the rotationally molded structure with a closed-cell or open-cell foam
Data Source
AI summary
The present disclosure is directed to implementation of an environmental control unit using rotomolded techniques to fabricate the structures of the unit instead of the standard conventional sheet metal, extruded, forged, and punched parts. Such implementations will provide a lighter weight and more durable mechanical configuration that will also simplify inspection, simplify assembly/disassembly, and reduce fabrication costs. Implementations incorporate rotationally-molded interlocking structures to contain and attach the critical items of the ECU's mechanical components including the compressor, and the indoor and outdoor coils, as well as the fan and blower motor assembly. In one implementation, the rotomolded structure is strengthened and insulated (thermally and acoustically) by filling the interior void of the rotationally molded structure with a closed-cell foam.