Automatic Pool Cleaner Lateral Movement via Differential Wheel Traction
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Solution Overview
Problem
Directional control of automatic swimming pool cleaners using water jets does not always produce optimal results, as exhaust water may be jetted into the air or exit the pool, leading to different directional thrust compared to exhausting into the pool body, necessitating more effective control methods.
Innovation Solution
Adjusting the rotation speeds and directions of traction motors of the automatic pool cleaner to enable lateral movement along pool walls, allowing efficient scrubbing of the waterline areas by varying the operation of motive elements such as brushes and wheels, and adjusting the pump output to assist movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water jets are used for directional control of the APC, then the APC can move autonomously, but the directional thrust becomes inconsistent when exhaust water exits the pool into air
Solution Approach 1:
The patent replaces the water jet propulsion system with a mechanical wheel-based traction system. The APC uses independently controllable wheels with variable speed and direction control to achieve lateral movement along pool walls, eliminating the reliability issues associated with water jet exhaust directionality.
Solution Approach 2:
The patent employs variable speed control of the traction wheels to achieve directional movement. By independently adjusting the rotation speed and direction of each wheel, the APC can move laterally along the pool wall at the waterline, providing consistent and reliable directional control regardless of water exit conditions.
2Productivity
If the APC moves laterally along the waterline to clean walls efficiently, then cleaning effectiveness improves, but the directional control system becomes more complex
Solution Approach 1:
The patent designs the traction wheels to serve dual functions: providing propulsion for forward movement and enabling lateral movement along pool walls. This multi-functionality allows the APC to clean both the pool bottom and waterline areas efficiently without requiring separate specialized systems, thereby managing complexity while maintaining productivity.
3Device complexity
If water jets are used for propulsion, then the system structure can be simplified, but the directional control reliability deteriorates when exhaust water exits the pool
Solution Approach 1:
The patent replaces the water jet propulsion system with a mechanical wheel-based traction system. The APC uses independently controllable wheels with variable speed and direction control to achieve lateral movement along pool walls, eliminating the reliability issues associated with water jet exhaust directionality.
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
Enables efficient lateral movement and cleaning of pool walls and floors by allowing the cleaner to 'crab walk' along surfaces, improving debris removal and avoiding obstacles, and potentially reducing the likelihood of getting stuck in corners.
Implementation Method 1
adjusting the rotation speeds and directions of traction motors of the automatic pool cleaner to enable lateral movement along pool walls
Data Source
AI summary
An automatic swimming pool cleaner having a body can be caused to travel laterally along a surface of a swimming pool by varying a characteristic of operation of at least one motive element. For example, a first motive element (such as a brush and/or wheel on one side of the body) can be driven at a different speed and/or in a different direction than a second motive (such as a brush and/or wheel on the opposite side of the body) element to cause the automatic pool cleaner to move laterally along the surface of the swimming pool.