Ventilation device
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Solution Overview
Problem
Decentralized ventilation devices face challenges in reducing noise emissions from the axial fan and external noise penetration while maintaining efficient air flow, as existing noise reduction solutions either impede air flow or require complex structures that are not suitable for decentralized systems.
Innovation Solution
A soundproofing sleeve made of high-strength sound-absorbing material, such as open-pored foam, is integrated into the wall sleeve, covering the entire length of the air duct, with the axial fan and heat accumulator fixed within, eliminating the need for additional sound-conducting elements and maintaining the air duct's diameter, thus providing effective noise reduction without compromising air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sound-absorbing housing element is added to reduce noise, then noise reduction is improved, but device complexity increases
Solution Approach 1:
The sound-absorbing housing element is merged with the existing outer housing structure. The housing element is attached to the inner side of the outer housing, combining the structural function of the housing with the sound absorption function in a single integrated component, thereby reducing overall device complexity while achieving noise reduction.
Solution Approach 2:
The outer housing serves multiple functions: it provides structural support for the ventilation device and simultaneously acts as a sound-absorbing element when the sound-absorbing material is attached to its inner side. This multi-functionality reduces the need for separate sound insulation components, simplifying the overall device structure.
2Object-affected harmful factors
If sound-absorbing material is added to the housing, then noise reduction is improved, but manufacturing complexity increases
Solution Approach 1:
The sound-absorbing material is attached to the housing element during the manufacturing process before the final assembly of the ventilation device. This preliminary action allows the sound-absorbing component to be pre-fabricated and pre-positioned, simplifying the final assembly process and reducing manufacturing complexity.
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 solution achieves significant noise reduction from both internal and external sources without reducing air volume flow, maintaining the efficiency of the ventilation system and allowing for easy maintenance and use of standard components.
Implementation Method 1
a housing element acoustically connected to the inner area of the enclosure, which contains the heat storage unit and axial fan. This housing element is made of a sound-absorbing material
Implementation Method 2
a heat storage unit located between the axial fan and the outside in the wall mounting sleeve
Data Source
Figure 1
AI summary
The invention relates to a ventilation device for supplying and extracting air from a room. Such a ventilation device comprises a wall-mounted sleeve (1) for connecting an interior side of the room to an exterior side. It further comprises a sound-insulating element made of a sound-absorbing material, as well as an axial fan that can be operated in at least two operating states with opposite airflow directions for supplying air from the exterior side to the interior side of the room and for extracting air from the interior side of the room to the exterior side. It also comprises a heat storage element (10) arranged between the axial fan and the exterior side. According to the invention, the sound-insulating element is designed as a sound-insulating sleeve (6) which is fitted into the wall-mounted sleeve (1) with respect to its external dimensions.The sound-insulating sleeve (6) has an inner surface (7) which defines the outer boundary of an air duct for the passage of air between the inside of the room and the outside. The axial fan and the heat storage unit (10) are fixed within the sound-insulating sleeve (6) by a connection to it. The heat storage unit (10) is made of a ceramic material and has a plurality of channels separated from one another by walls, extending along a flow direction defined by the axial fan and the wall mounting sleeve (1).