Rotatable Dishwasher Spray Arm With Dual-Valve Spray Control
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Solution Overview
Problem
Conventional dishwashers face inefficiencies in distributing water and cleaning agents across dish racks, leading to incomplete washing and potential water wastage, particularly due to the fixed nature of sprayer arms which do not adapt to varying dish loads or cleaning cycles effectively.
Innovation Solution
The implementation of a rotatable spray arm with a dual valve body system that adjusts spray outlet alignment and flow duration based on rotation, allowing for both wide-angle and focused spray patterns to optimize cleaning coverage and water usage, controlled by a hydraulic or motor-driven mechanism integrated with the dishwasher's recirculation pump system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed spray arm is used, then the structure is simple and easy to manufacture, but the cleaning coverage is incomplete and water distribution is inefficient
Solution Approach 1:
The spray arm is designed to rotate about a vertical axis instead of being fixed, allowing dynamic adjustment of spray direction. The rotation mechanism enables the spray arm to sweep across different areas of the dish rack, improving water distribution coverage and cleaning effectiveness while maintaining reasonable structural complexity through the use of a recirculation pump-driven rotation system.
2Productivity
If a rotatable spray arm is implemented, then cleaning coverage is improved, but the device complexity increases due to additional valve bodies and control mechanisms
Solution Approach 1:
The spray arm is divided into multiple spray outlets arranged in different patterns (e.g., first set of outlets at one radial position, second set at another position). The valve body is segmented to selectively block or open different outlet sets independently. This segmentation allows the system to provide varied spray patterns (wide-angle vs. focused) without requiring a completely complex reconfiguration mechanism, as each segment can be controlled separately.
Solution Approach 2:
The rotatable spray arm operates by periodically rotating to different positions, with the valve body selectively opening or closing spray outlets at different rotation phases. This periodic action allows the system to cycle through different spray patterns and coverage areas, achieving comprehensive cleaning coverage while managing complexity through rhythmic, predictable operation cycles.
3Manufacturing precision
If spray outlets are fixed in position, then the manufacturing precision requirement is lower, but the adaptability to different cleaning cycles and dish loads is poor
Solution Approach 1:
The spray outlets are arranged in multiple sets at different radial positions around the spray arm, and the valve body can selectively activate different sets based on the cleaning cycle requirements and detected dish load. This dynamic configuration allows the system to adapt spray patterns without requiring complex real-time repositioning mechanisms, maintaining manufacturing simplicity while achieving versatility.
Solution Approach 2:
Different sets of spray outlets are designed with different spray characteristics (e.g., wide-angle outlets for general coverage, focused outlets for targeted cleaning). The valve body selectively activates specific outlet sets based on local cleaning needs detected during operation. This local quality approach allows different parts of the spray arm to serve different functions, enhancing adaptability without requiring all outlets to be repositionable.
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 effectiveness by dynamically adjusting spray patterns to suit different cleaning cycles and dish loads, reducing water consumption and energy usage while ensuring thorough washing, thereby improving overall dishwasher performance.
Implementation Method 1
controlled by a hydraulic or motor-driven mechanism integrated with the dishwasher's recirculation pump system
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A dishwasher (10) includes a tub (18) at least partially defining a treating chamber (20) and a spraying system (28) having a sprayer (30, 32, 34) supplying liquid to the treating chamber (20). The sprayer (30, 32, 34) may include a liquid passage (62) and multiple spray outlets (64) to emit sprays to wash the dishes, a first valve body (66) to couple at least one of the multiple spray outlets (64) to the liquid passage (62), and a second valve body (72) to control a flow of liquid.