Lower Spray Arm Rotation Control for Zonal Dishwasher Washing
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Solution Overview
Problem
Traditional dishwasher spray arms rely on hydraulic drive, which is dependent on pump flow rate and pressure, limiting their speed and direction control, often resulting in stalled operations during cycles and suboptimal cleaning performance.
Innovation Solution
The implementation of a motor-driven first lower spray assembly with a coaxial drive system and diverter valve assembly allows for independent control of rotation speed and direction, enabling efficient and controlled liquid distribution and improved wash coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydraulic drive is used for spray arms, then the system is simple and compact, but the rotation speed and direction cannot be independently controlled
Solution Approach 1:
The patent combines the hydraulic drive system and diverter valve system into a single integrated unit. The diverter valve is positioned within the spray arm assembly, and both systems share common components such as the pump and fluid passages. This merging allows independent control of spray arm rotation and liquid diversion while maintaining system compactness and reducing overall complexity.
Solution Approach 2:
The hydraulic fluid serves multiple functions: it provides hydraulic pressure for spray arm rotation, acts as the diverting medium for liquid flow control, and enables both rotational movement and spray diversion operations. This multi-functionality reduces the need for separate control systems while achieving independent control of spray patterns and arm rotation.
2Reliability
If hydraulic drive is used for spray arms, then the structure is compact, but the operation often stalls during cycles
Solution Approach 1:
The controller monitors the operation of spray arms and diverter valves, adjusting hydraulic pressure and flow distribution in real-time. This feedback mechanism detects stalled conditions and corrects them by modifying pump output or valve positions, ensuring continuous reliable operation without requiring overly complex mechanical redundancy.
Solution Approach 2:
The system dynamically adjusts hydraulic pressure and flow rates during different phases of the wash cycle. The controller modulates pump operation and valve positions to match the instantaneous needs of spray arms, preventing stalling by maintaining optimal pressure and flow conditions throughout the cycle rather than using fixed hydraulic parameters.
3Manufacturing precision
If hydraulic drive is used for spray arms, then fewer components are needed, but cleaning performance is suboptimal
Solution Approach 1:
The wash chamber is divided into multiple spray zones with independently controllable spray arms and diverter valves. Each zone can be individually adjusted for spray pattern, pressure, and rotation speed, enabling optimized cleaning performance for different areas of the wash chamber while maintaining overall system integration.
Solution Approach 2:
The controller dynamically changes hydraulic parameters including pressure, flow rate, and diversion timing to optimize cleaning performance for different wash cycle phases and soil types. This parameter modulation enables precise control of spray characteristics without requiring complex mechanical modifications to the basic hydraulic architecture.
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 solution enhances cleaning efficiency by allowing for zonal washing, optimizing resource usage, and preventing wasted water and energy, while ensuring consistent operation throughout the wash cycle.
Implementation Method 1
a drive system having a first drive shaft rotatable about a second axis of rotation... selective actuation of the drive system independently provides a driving force that moves the first sprayer within the wash chamber and provides a driving force that drives rotation of the valve element
Data Source
AI summary
An automatic dishwasher having first and second sprayers located within a washtub, a diverter valve to selectively divert liquid flowing from the wash chamber between the first and second sprayers, and a drive system moving the first sprayer in the wash chamber.