Fabric drop-down diffusers
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Solution Overview
Problem
Existing HVAC drop-down diffusers face challenges in evenly dispersing air, reducing noise, minimizing condensation, and providing adjustable airflow patterns while being lightweight, washable, and collapsible for easy packaging and installation.
Innovation Solution
The design incorporates non-porous and air-permeable fabric supported by rigid hoops, with adjustable tension members and baffles to control airflow, and features such as drawstrings, zippers, and internal screens to enhance airflow distribution and noise reduction, allowing for customizable airflow patterns and easy installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid box-like structure with porous fabric is used for the diffuser, then air dispersion evenness is improved, but weight and ease of installation are worsened
Solution Approach 1:
The patent replaces the traditional rigid box-like structure with a flexible fabric construction. The diffuser is made from a flexible substrate material that can be collapsed for packaging and easily installed. The fabric substrate maintains structural integrity while being lightweight, and air-permeable layers are integrated into this flexible structure to achieve even air dispersion without the weight penalty of rigid materials.
Solution Approach 2:
The diffuser employs a multi-layer composite structure consisting of a flexible substrate combined with air-permeable layers. This composite material approach allows the diffuser to simultaneously achieve the air dispersion characteristics of porous materials while maintaining the lightweight and flexible properties of the substrate material, resolving the contradiction between dispersion evenness and weight.
2Adaptability or versatility
If adjustable airflow patterns are implemented, then adaptability is improved, but device complexity is worsened
Solution Approach 1:
The patent incorporates adjustable components that allow the diffuser to dynamically change its airflow characteristics. The flexible substrate enables the diffuser to be configured in different shapes and orientations, while adjustable air-permeable layers can be positioned or removed to create various airflow patterns. This dynamic adjustability is achieved through simple mechanical means rather than complex automated systems.
Solution Approach 2:
The diffuser structure is divided into separate functional layers, including the flexible substrate and distinct air-permeable layers that can be independently adjusted or removed. This segmentation allows users to modify airflow patterns by reconfiguring or removing specific layers without affecting the entire diffuser structure, thereby achieving adaptability with minimal complexity.
3Object-generated harmful factors
If noise reduction features are added, then harmful factors are reduced, but device complexity is worsened
Solution Approach 1:
The flexible fabric construction of the diffuser naturally provides noise reduction through sound absorption and damping properties of the material. The layered fabric structure dissipates acoustic energy as air passes through, reducing noise without requiring additional acoustic treatment components or complex noise-blocking structures.
4Ease of manufacture
If the diffuser is made collapsible for easy packaging, then ease of manufacture and installation is improved, but structural strength is worsened
Solution Approach 1:
The diffuser is constructed from flexible substrate materials that can be collapsed into a compact form for efficient packaging and easy installation. Despite the flexible nature allowing collapse, the material composition and layered structure provide sufficient structural strength to maintain the diffuser's functional integrity during handling, installation, and operation. The flexibility and strength requirements are balanced through material selection and structural design.
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 effectively disperses air evenly, reduces noise and condensation, and allows for adjustable airflow patterns, making the diffuser lightweight, washable, and collapsible for efficient packaging and installation, improving HVAC system performance and user convenience.
Implementation Method 1
Some drop-down diffusers have a sheet of porous fabric attached to the rigid box-like structure. The porous fabric helps in evenly dispersing the supply air into the areas being served by the HVAC system.
Data Source
AI summary
Fabric drop-down diffusers are disclosed. An example drop-down diffuser includes a first fabric sheet. The first fabric sheet is to extend away from a ceiling at a location adjacent a supply inlet. The supply inlet is to provide a flow of air toward the first fabric sheet. The example drop-down diffuser also includes a blanking sheet to restrict air flow through the first fabric sheet. The blanking sheet is to be disposed on an interior surface of the first fabric sheet. The blanking sheet has a lower permeability than the first fabric sheet.