Multi-Weir Door Assembly for Low-Speed Skimming
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Solution Overview
Problem
Existing skimmers for spas, swimming pools, and hot tubs are inefficient at low pump speeds, as they rely on high water velocity to draw debris over the weir door, which is not sufficient when pumps operate at lower speeds due to energy conservation initiatives.
Innovation Solution
A skimming system with a multi-weir door assembly, where multiple weir doors with different buoyancies are rotationally coupled to the skimmer body, allowing water flow to affect each door differently, ensuring efficient debris removal across various flow rates by adjusting their angular positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single weir door is used in traditional skimmers, then the structure is simple and easy to manufacture, but the skimmer cannot operate efficiently at low pump speeds due to insufficient water velocity over the weir door
Solution Approach 1:
The single weir door is segmented into multiple weir doors (typically two or three) with different buoyancies, allowing each door to respond independently to water flow conditions. This segmentation enables the skimmer to maintain effectiveness across a broader range of pump speeds by having different doors activate at different flow rates.
Solution Approach 2:
The weir doors are made dynamically responsive to water flow conditions through their rotational coupling and differential buoyancy design. Each door can rotate to different angular positions based on the instantaneous flow rate, allowing the system to adapt automatically to varying pump speeds without manual intervention.
2Loss of energy
If pump speed is reduced for energy conservation, then energy consumption decreases, but water velocity over the weir door becomes insufficient to draw debris into the skimmer
Solution Approach 1:
Different weir doors are assigned different local qualities in terms of buoyancy, allowing each door to be optimized for specific flow rate ranges. The less buoyant door responds at lower flow rates while the more buoyant door responds at higher flow rates, ensuring continuous effective operation across the full pump speed range.
Solution Approach 2:
The system changes the effective parameters of the skimmer by using multiple weir doors with different buoyancies instead of a single fixed-door design. This allows the skimmer to maintain optimal performance parameters across varying pump speeds, extracting the maximum skimming efficiency at each operating point.
3Productivity
If venturi is added to increase flow at low pump speeds, then additional flow can be created through pressure drop, but the system becomes more complex and requires high velocity to function effectively
Solution Approach 1:
The multi-weir door system is self-regulating and requires no additional active components or external energy input. The differential buoyancy of the doors automatically adjusts the skimmer opening based on flow conditions, eliminating the need for venturi tubes, nozzles, or other flow-enhancing devices that would add complexity.
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 system effectively operates at low pump speeds by ensuring debris is drawn into the skimmer, maintaining efficiency across different water flow velocities, from low to high, without relying on high velocity water flows.
Implementation Method 1
Each of the weir doors has a respective buoyancy, and at least first and second weir doors of the multiple weir doors have first and second buoyancies that are different from one another
Data Source
AI summary
A multi-weir door assembly is coupled to a skimmer body near a front entrance of the skimmer body such that a flow of water received in the front entrance is incident on a front side of the multi-weir door assembly. The multi-weir door assembly comprises multiple weir doors that are rotationally coupled to the skimmer body by at least a first hinge assembly. Each of the weir doors has a respective buoyancy, and at least first and second weir doors of the multiple weir doors have first and second buoyancies that are different from one another such that the flow of water incident on the multi-weir door assembly affects the first and second weir doors differently in terms of an angular degree to which the incident flow of water causes the first and second weir doors to rotate about first and second axes of rotation, respectively.