Double-Hood Ventilation Assembly for Universal Contaminant Shielding
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Solution Overview
Problem
Existing ventilation arrangements are limited in usability due to their effectiveness only in a limited number of installation positions, leading to costs and errors in providing different arrangements for various positions, and are prone to foreign bodies penetrating the ventilation channel.
Innovation Solution
A ventilation arrangement featuring a first umbrella hood surrounded by a second umbrella hood with coaxially extending grooves on the outer jacket side of both, creating a double-shell structure that deflects and filters fluids, preventing foreign substances from entering the ventilation channel, and allowing for rotationally symmetrical installation without specific assembly positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single shielding hood is used to protect the outlet opening, then the structure is simple, but the protection effectiveness is limited and foreign bodies can still penetrate the ventilation channel
Solution Approach 1:
The patent implements a nested shielding structure where a first shielding hood is placed inside a second shielding hood, both concentrically arranged around the outlet opening. This nested configuration creates multiple barriers against foreign bodies while maintaining a compact overall structure, directly resolving the contradiction between enhanced protection and structural simplicity.
2Reliability
If different ventilation arrangements are provided for different installation positions, then the protection effectiveness for each position is optimized, but the cost increases and maintenance becomes complex
Solution Approach 1:
The patent designs a universal ventilation arrangement with rotationally symmetric double shielding hoods that can be installed in any position (vertical, horizontal, inclined) without requiring different configurations. The symmetric structure ensures consistent protection effectiveness across all installation orientations, eliminating the need for multiple specialized arrangements and reducing both cost and maintenance complexity.
Solution Approach 2:
The patent employs rotationally symmetric design elements that function effectively in asymmetric installation positions. The circular cross-section of the ventilation duct and the concentric arrangement of shielding hoods create a configuration that maintains its protective function regardless of the installation orientation, allowing a single design to serve multiple installation scenarios.
3Reliability
If specific installation instructions are implemented to ensure specific installation positions, then the protection effectiveness is optimized, but assembly errors increase and productivity decreases
Solution Approach 1:
The rotationally symmetric double shielding hood design allows the ventilation arrangement to be installed in any position without requiring specific orientation instructions. This universal design eliminates complex assembly guidelines, reduces the risk of assembly errors, and enables installers to complete the task quickly without needing to determine or maintain a specific installation position.
4Productivity
If the ventilation duct has a fixed cross-section, then the manufacturing is simple, but the fluid flow efficiency is reduced due to turbulence at the outlet opening
Solution Approach 1:
The patent applies a localized cross-sectional change to the ventilation duct, specifically creating a tapered section near the outlet opening while keeping the main duct body with constant cross-section. This localized modification optimizes fluid flow by reducing turbulence at the outlet without significantly complicating the overall manufacturing process, as the majority of the duct remains simple and easy to manufacture.
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 provides a universally installable ventilation system that effectively prevents foreign substances from entering the ventilation channel, reduces turbulence, and allows for efficient fluid flow and filtration across various installation positions, enhancing protection and usability.
Implementation Method 1
coaxially extending grooves are arranged on the outer casing side on the ventilation duct and on the outer casing side on the second shielding hood
Implementation Method 2
A gap, in particular an annular gap, is preferably formed between the first shielding hood and the ventilation duct, which supports the deflection of the fluids exiting from the ventilation opening or entering the ventilation opening into the outlet opening. The deflection should be at least 180° relative to the vertical of the outlet opening.
Implementation Method 3
By widening or narrowing the ventilation duct, for example by making it funnel-shaped or conical, the flow in the area of the outlet opening can be influenced in terms of its flow velocity or the distribution of the escaping or entering fluid. If necessary, acceleration or deceleration in the inlet or outlet direction of the outlet opening can be promoted or reduced.
Data Source
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AI summary
A ventilation arrangement has a ventilation channel (2) with a mouth opening (3) and a first shielding hood (10) shielding the mouth opening (3). The ventilation channel (2) widens and/or narrows in cross section towards the mouth opening (3). The mouth opening (3) is encompassed by the first shielding hood (10), leaving free a gap (12).