Dishwasher Tub Damping Layout for Noise and Heat Loss
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Solution Overview
Problem
Existing dishwashers with sound deadening bitumen mats applied over large areas on stainless steel washing compartments face energy inefficiencies due to heat absorption and increased energy consumption during operation and manufacturing, as well as inefficiencies in noise reduction.
Innovation Solution
Applying sound deadening layer mats only partially to areas with significant operational vibration, such as droplet impact zones, and using additional thermal or sound absorption mats in less critical areas, reducing material usage and energy absorption, while ensuring targeted noise reduction and thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound deadening bitumen mats are applied over large areas on stainless steel washing compartments, then noise reduction is improved, but energy consumption increases due to heat absorption
Solution Approach 1:
The patent applies sound deadening bitumen mats selectively only in areas with high vibration amplitude (droplet impact zones) rather than covering the entire washing compartment surface. This localized application reduces the total mass of bitumen material, thereby minimizing heat absorption and energy consumption while maintaining effective noise reduction in the most critical areas.
Solution Approach 2:
The washing compartment surface is divided into different zones based on vibration characteristics: high-vibration droplet impact areas and low-vibration other areas. Sound deadening mats are applied only to the high-vibration zones, segmenting the application area to optimize the balance between noise reduction and energy efficiency.
2Object-affected harmful factors
If bitumen mats with high mass and heat capacity are used for sound deadening, then noise damping is improved, but thermal energy loss increases
Solution Approach 1:
High mass bitumen mats are used only in localized droplet impact areas where vibration amplitude is highest, rather than covering the entire washing compartment. This reduces the total heat capacity of the sound deadening system, minimizing thermal energy loss while maintaining effective noise damping in critical zones.
3Object-affected harmful factors
If sound deadening layer mats are applied to all washing container wall areas, then noise reduction is maximized, but material usage and manufacturing complexity increase
Solution Approach 1:
The patent identifies and treats only the most critical noise-generating areas (droplet impact zones with high vibration amplitude) with sound deadening mats, leaving other areas untreated. This selective approach simplifies the manufacturing process by reducing material handling, application time, and processing steps while achieving effective noise reduction.
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 approach reduces energy consumption during operation and manufacturing by minimizing material usage and heat absorption, while achieving effective noise reduction and thermal insulation through localized application of sound and thermal insulation mats.
Implementation Method 1
polymer-modified bitumen mats with an adapted loss factor are bonded to the metal surfaces of the washing compartment of the respective dishwasher to dampen structure-borne noise
Implementation Method 2
The bitumen mats, which have a high heat capacity, are usually glued to the stainless steel container. The bitumen mats heat up during the heating phases and subsequent circulation times of the dishwasher. Their energy absorption capacity depends on the mass and heat capacity of the fillers added to the bitumen mats.
Implementation Method 3
this is done using a so-called hot-melt adhesive, ie a hot-melt adhesive that reacts when external heat is applied
Data Source
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AI summary
In the case of a water-channelling domestic appliance, in particular a dishwasher, having a dishwashing compartment (1), with a sound-absorbing layered mat (21), in particular a bitumen mat, applied to the outside of the at least one dishwashing-compartment wall, the at least one sound-absorbing layered mat (21) is merely partially applied to at least one dishwashing-compartment-wall region (27), which exhibits a greater level of operational vibration than other dishwashing-compartment-wall regions (28).