Portable Spa Panel Structure for Thermal Expansion Relief

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Solution Overview

Problem

Portable spas face challenges in accommodating thermal expansion and contraction of materials used in their construction, which can lead to structural damage due to differing coefficients of expansion between components.

Innovation Solution

A spa structure design featuring trapezoidal side panels that can slide horizontally and vertically within corner pieces, with pivotable panel clips for easy assembly and disassembly, and angled force transfer members to support the spa shell, minimizing contact with the surface and allowing for thermal expansion without distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If side panels are rigidly fixed to corner pieces, then structural stability is improved, but thermal expansion and contraction causes structural damage

Engineering Contradiction:

Improvestructural stabilityVSAvoidstructural integrity under thermal stress

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The side panels are designed to be movable relative to the corner pieces through grooves that permit horizontal and vertical sliding. This dynamic connection allows the panels to adjust their position in response to thermal expansion and contraction, preventing structural damage while maintaining stability during normal use.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The grooves in the corner pieces are designed with specific dimensions and orientations to accommodate changes in panel position. By changing the positional parameters of the side panels through the groove mechanism, the structure adapts to thermal variations without compromising integrity.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If side panels are made movable to accommodate thermal expansion, then thermal stress damage is prevented, but structural stability decreases

Engineering Contradiction:

Improveresistance to thermal stressVSAvoidstructural stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The grooves are pre-configured in the corner pieces to guide and constrain the movement of side panels within specific limits. This preliminary structural arrangement ensures that while movement is permitted for thermal accommodation, the panels remain within stable positional boundaries during operation.

Inventive Principle:

Principle #10Preliminary action

3Stability of the object's composition

If maximum contact between spa structure and surface is used, then stability is improved, but heat transfer increases

Engineering Contradiction:

ImprovestabilityVSAvoidheat transfer

Core Design Contradiction:

Stability of the object's compositionVSLoss of energy

Solution Approach 1:

The base pan is designed with a centrally positioned configuration that concentrates contact with the supporting surface at specific locations rather than across the entire bottom surface. This local contact approach provides sufficient stability while minimizing the total area through which heat can transfer to the supporting surface.

Inventive Principle:

Principle #3Local quality

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 design allows for the spa structure to expand and contract without damaging the panels, maintaining structural integrity and appearance by reducing contact with the surface and minimizing heat transfer.

Implementation Method 1

accommodate expansion or contraction of the side panels

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

angled force transfer members are attached at respective lower ends of the vertical support members to transfer force from each respective vertical support member to an inner bottom surface of the base pan

Methodology Applied

Scientific EffectForce transfer: Mechanical Force

Implementation Method 3

minimizing contact with the surface and allowing for thermal expansion without distortion

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Data Source

PatentUS9572459B2Portable spa construction

Publication Date: 2017.02.21 WATKINS MANUFACTURING CORP

AI summary

Spa side panels are trapezoidally-shaped and mounted in respective grooves defined by adjacent tapered corner pieces and their mounting brackets to accommodate differences in coefficients of expansion of the respective parts and prevent structural damage. Angled force transfer members are configured to mate with swept back side surfaces of a spa base pan to achieve a pedestal appearance, and the bottom surface of the base pan is constructed to reduce heat transfer to the spa support surface.