Dishwasher Noise Shield Structure for Wash Water Impact Reduction
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Solution Overview
Problem
Conventional dishwashers do not effectively minimize noise and vibration caused by wash water colliding against the tub, which is a significant source of disturbance.
Innovation Solution
A noise shield is integrated between the spray arm and the tub's bottom surface to reduce the kinetic energy of falling wash water, comprising a fixing unit, inclined plates, and a spacer system that adjusts the drop distance and velocity of wash water, thereby minimizing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wash water is sprayed from the spray arm toward the rack, then washing function is achieved, but noise and vibration are generated when water collides against the tub
Solution Approach 1:
A noise shield is introduced as an intermediary component between the spray arm and the tub bottom surface. The shield intercepts falling wash water and redirects it, preventing direct collision with the tub. This mediator structure reduces the kinetic energy transfer to the tub, thereby minimizing noise and vibration while preserving the washing function.
Solution Approach 2:
The noise shield converts the harmful kinetic energy of falling water into a beneficial redirecting flow. By positioning the shield to intercept water at a specific angle, the design transforms the harmful downward collision into a controlled flow pattern that reduces impact noise while maintaining water's washing effectiveness on the rack.
2Productivity
If the spray arm is positioned to spray water toward the rack, then washing efficiency is improved, but water drops directly onto the tub bottom causing noise
Solution Approach 1:
The noise shield serves as a mediator structure positioned between the spray arm discharge point and the tub bottom. It intercepts water droplets that would otherwise fall directly onto the tub surface, redirecting them along the shield's surface to reduce impact velocity and noise generation while preserving washing efficiency.
Solution Approach 2:
The noise shield performs preliminary action by intercepting and redirecting water droplets before they reach the tub bottom surface. This pre-intervention reduces the droplets' kinetic energy through controlled redirection along the shield surface, preventing the harmful impact noise from occurring in the first place.
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 noise shield effectively reduces the noise and vibration generated by wash water impacting the tub's bottom surface by lowering the drop velocity and mass of wash water particles, enhancing user convenience and washing efficiency.
Implementation Method 1
a noise shield provided between the spray arm and a bottom surface of the tub to reduce a kinetic energy of the wash water falling from a top of the spray arm toward the bottom surface of the tub
Implementation Method 2
the wash water falling from a top of the spray arm toward the bottom surface of the tub
Data Source
AI summary
A dishwasher includes a tub configured to define a washing space, a rack provided in the tub to provide a space where washing objects are held, a spray arm provided in the tub and located under the rack to spray wash water to the rack, and a noise shield provided between the spray arm and a bottom surface of the tub to reduce a kinetic energy of the wash water falling from above the spray arm toward the bottom surface of the tub.