Dishwasher Tub Insulation Layout for Heat and Noise Control
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Solution Overview
Problem
Existing water-bearing household appliances, such as dishwashers, face challenges in achieving effective acoustic and thermal insulation, leading to increased noise emission and energy consumption when using bitumen mats for insulation, as reducing the coverage area of these mats enhances noise reduction but increases energy usage.
Innovation Solution
A dual-insulation arrangement is implemented, where a first insulation element with low thermal conductivity and specific density is foamed directly onto the receiving area, providing thermal insulation, and a second insulation element with higher density is used for acoustic insulation, preventing heat transfer and transmitting vibrations effectively, thereby reducing noise and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If bitumen mats are applied to the wash tub for thermal insulation, then thermal insulation performance is improved, but noise emissions increase
Solution Approach 1:
The insulation system is divided into two separate functional layers: a first insulation element (foam material) dedicated to thermal insulation and a second insulation element (bitumen mat) dedicated to acoustic insulation and vibration damping. This segmentation allows each material to perform its optimal function without the compromises required in a single-layer system.
Solution Approach 2:
The patent employs a composite insulation structure combining two different materials with complementary properties: a foam material (polystyrene, polyurethane, or phenolic foam) for thermal insulation and a bitumen mat for acoustic insulation. The composite structure leverages the strengths of each material while mitigating their individual weaknesses.
2Object-generated harmful factors
If the proportion of wash tub surface area covered by bitumen mats is reduced to decrease noise emissions, then noise emissions are reduced, but thermal insulation performance deteriorates
Solution Approach 1:
By separating the thermal insulation function from the acoustic insulation function into different layers, the system allows the bitumen mat coverage to be optimized for noise reduction without compromising thermal insulation, as the foam material continues to provide thermal protection across the full surface area.
Solution Approach 2:
The composite structure enables independent optimization of each layer's coverage and material properties, allowing the bitumen mat to be applied only where acoustic insulation is most needed while the foam material provides comprehensive thermal insulation.
3Object-generated harmful factors
If additional insulation layers are added to improve acoustic and thermal insulation, then insulation performance is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The patent combines the attachment function into the first insulation element by providing adhesive means integrated into the foam material structure, eliminating the need for separate attachment operations. This merging of functions reduces assembly steps while maintaining the benefits of dual-layer insulation.
Solution Approach 2:
The adhesive means is pre-applied or integrated into the first insulation element during its preparation, so that when the insulation elements are assembled, the attachment has already been performed. This preliminary action simplifies the final assembly process.
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 arrangement reduces noise emission by approximately -1 dB(A) and energy consumption by up to -40 Wh, while simplifying production and assembly by eliminating the need for additional attachment steps and improving energy efficiency.
Implementation Method 1
The first insulation element is configured to transmit vibrations from the receiving area to the second insulation element
Implementation Method 2
The second insulation element is designed to convert vibrations into heat
Implementation Method 3
the first insulation element prevents heat transfer from the receiving area to the second insulation element
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The invention relates to an arrangement (13) for acoustically and thermally insulating a receiving area (2) of a water-bearing household appliance (1), in particular a washing compartment of a dishwasher, having a first insulating element (14) which is designed to thermally insulate the receiving area (2). to insulate, and a second insulation element (16) which is set up to acoustically insulate the receiving area (2), wherein the first insulating element (14) is arranged between the receiving area (2) and the second insulating element (16) and wherein the first insulation element (14) is foamed directly onto the receiving area (2).