Elevator Car Apron Sound Absorption for Shaft Wind Noise
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Solution Overview
Problem
Existing elevator noise reduction systems, such as those using sound transmitters and electronic circuits, are costly, complex, and prone to operational failures, requiring specialized knowledge for installation and maintenance.
Innovation Solution
The implementation of sound-absorbing means, including porous layers and resonance absorbers, mounted on the car apron and shaft door aprons to dampen wind noises without the need for sensors or electronic components, utilizing materials like mineral fibers and open-cell foam for effective noise reduction across a wide frequency spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound transmitters and electronic circuits are used for noise reduction, then noise attenuation is achieved, but device complexity and cost increase
Solution Approach 1:
The invention extracts and eliminates the complex electronic components (sensors, sound transmitters, electronic circuits) from the noise reduction system, retaining only the essential sound-absorbing means mounted on the car apron. This simplifies the device while maintaining noise attenuation functionality.
Solution Approach 2:
The invention replaces expensive electronic noise reduction systems with inexpensive sound-absorbing materials that can be easily mounted and maintained. The sound-absorbing means are simple, cost-effective components that do not require complex installation or specialized maintenance knowledge.
2Object-affected harmful factors
If sound transmitters and sensors are installed, then noise reduction is achieved, but installation and maintenance difficulty increases
Solution Approach 1:
The invention removes the need for complex installation procedures associated with electronic components. The sound-absorbing means are designed to be mounted directly on the car apron using simple methods, eliminating the need for specialized installation knowledge and complex wiring.
3Object-affected harmful factors
If electronic noise reduction systems are used, then noise attenuation is achieved, but operational reliability decreases
Solution Approach 1:
The invention extracts and eliminates electronic components that are prone to failure, leaving only passive sound-absorbing materials. This removes the source of potential operational failures while maintaining the noise reduction function.
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 provides economic and reliable noise reduction with simplified installation and maintenance, minimizing the risk of operational failures and achieving effective noise damping without the complexity of electronic systems.
Implementation Method 1
the sound-absorbing means comprises a porous sound absorption layer mounted in the region of the car apron
Implementation Method 2
Good noise damping values in the case of noises with wide frequency spectrum can be achieved by a porous sound absorption layer
Implementation Method 3
For reduction of noises in lower frequency ranges a form of embodiment of the present invention is suitable in which the sound-absorbing means comprise at least one resonance absorber
Data Source
AI summary
An elevator installation includes an elevator car that moves in an elevator shaft with shaft doors and which car has at least one car apron arranged parallel to a plane of a shaft wall at a shaft door side. A device for reducing noises generated by the air flow arising between the shaft wall and the car apron includes sound-absorbing material that is mounted at the car apron and at the shaft wall.