Hollow Spa Cover with Rigid Frame and Bubble Wrap Insulation
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Solution Overview
Problem
Conventional spa covers made of expanded polystyrene core impregnated with water lose thermal insulating properties quickly, leading to increased power consumption and weight, making them inefficient and cumbersome.
Innovation Solution
A hollow, bi-folding or hinged spa cover with a ridged frame and breathable, water-repellent outer skin, using poly-coated metallic bubble wrap and gas-filled pillow packs to minimize convection currents and prevent water absorption, reducing air movement within the chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expanded polystyrene core is used in conventional spa covers, then initial thermal insulating properties are adequate, but water absorption occurs quickly causing thermal insulation to diminish and weight to increase
Solution Approach 1:
The patent removes the expanded polystyrene core entirely from the spa cover structure. Instead, it uses a hollow cover with a rigid perimeter frame and tensioned cross bands that create internal air spaces for insulation. This extraction of the problematic EPS material eliminates water absorption issues while maintaining thermal efficiency and reducing weight.
Solution Approach 2:
The patent utilizes air (gas) as the insulating medium within the hollow cover structure. The rigid frame with tensioned bands creates sealed air chambers that provide thermal insulation without absorbing water. This pneumatic approach replaces the solid EPS foam with a gas-filled structure that maintains consistent insulating properties.
2Reliability
If expanded polystyrene core is used in conventional spa covers, then initial thermal insulating properties are adequate, but water absorption causes power consumption to increase dramatically
Solution Approach 1:
By removing the EPS core that absorbs water and degrades insulation, the patent eliminates the root cause of increasing power consumption. The hollow structure with air-filled chambers maintains consistent thermal performance over time, preventing the dramatic increase in energy usage associated with water-impregnated foam.
Solution Approach 2:
The patent ensures continuous effective thermal insulation by using a water-repellent breathable outer skin and sealed air chambers that prevent moisture ingress. This maintains uninterrupted insulating performance, avoiding the degradation cycle that causes increasing power consumption in conventional covers.
3Strength
If conventional hinged spa covers with crossbar lift mechanism are used, then support structure is provided, but chimney effect causes thermal losses between folding segments
Solution Approach 1:
The patent divides the rigid frame into four quarter-segments that can be folded for compact storage. Each quarter-segment is enveloped in poly-coated metallic bubble wrap that provides both structural support and thermal insulation. The segmentation allows the cover to fold without creating chimney effects, as each segment is insulated and sealed.
Solution Approach 2:
The patent uses composite construction combining a rigid perimeter frame with tensioned cross bands, poly-coated metallic bubble wrap, and a breathable outer skin. This composite structure provides both the necessary support strength and thermal insulation to eliminate chimney effects between segments.
4Reliability
If expanded polystyrene foam is used in conventional spa covers, then initial insulation is provided, but the cover becomes heavier and more cumbersome over time
Solution Approach 1:
The patent extracts the heavy EPS foam from the cover structure, replacing it with a lightweight hollow design using rigid frames and air-filled chambers. This dramatically reduces weight while maintaining insulating performance, making the cover easy to remove and replace without the degradation issues of water-absorbing foam.
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 provides improved thermal efficiency and reduced weight, maintaining performance over time without the need for expanded polystyrene foam, thus lowering energy consumption and enhancing user experience.
Implementation Method 1
breathable, water repellant outer skin
Implementation Method 2
The hollow airspace within the casing can have improved thermal efficiency when the internal gas has minimal movement. The methods of minimizing convection currents can be conveniently be accomplished by large-bubble, bubble wrap used for lightweight packing and gas-filled pillow packs.
Implementation Method 3
The quarter-segments are enveloped in poly-coated metallic bubble wrap that forms an unsealed casing and cushioned undersurface for the breathable outer skin.
Data Source
AI summary
A lightweight insulating spa cover for a heated spa with an open top, the spa cover constructed with a substantially rigid perimeter frame with a plurality of cross supports in the form of tension bands that encompass the frame in a crisscross pattern to form a support for an outer casing that encases the frame with the outer casing being fabricated of a breathable weatherproof fabric that is stretched over a layer of reflective bubble wrap material that provides a cushion and added insulation for the hollow lightweight cover.