Ventilating Fan Pipe Hood Layout to Prevent Air Recirculation
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Solution Overview
Problem
Conventional ventilating fan assemblies suffer from air recirculation, contamination, rain and foreign material entry, and inefficient heat exchange due to the positioning of air inlet and outlet openings, lack of a satisfactory snapping structure for easy assembly and disassembly, and inadequate consideration for temperature differences between discharged and introduced air.
Innovation Solution
The assembly features a vertically divided pipe unit with separate air inlet and outlet passages on left and right sides, a partition plate made of thermal conductive material with concave and convex configurations, a slanted or curved front cover, and a grating with a water drain outlet to prevent air recirculation and contamination, while facilitating easy assembly and heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the external air outlet opening and external air inlet opening are disposed on the upper and lower sides of the front side of the pipe hood respectively, then the air inlet passage and air outlet passage are formed vertically, but the discharged air may enter into the indoor room via the external air inlet opening and cause secondary contamination
Solution Approach 1:
The patent changes the spatial arrangement of air passages from vertical (upper-lower) to horizontal (left-right) configuration. The baffle divides the pipe unit into left and right sides, with the air inlet passage on one side and air outlet passage on the other side, eliminating the recirculation problem by separating inlet and outlet in the horizontal dimension rather than vertical dimension
Solution Approach 2:
The pipe unit is segmented by a baffle into distinct air inlet and air outlet passages on left and right sides respectively. This segmentation physically separates the contaminated discharged air from the fresh introduced air, preventing mixing and recirculation while maintaining efficient ventilation flow paths
2Device complexity
If the switching curtains at the external air inlet opening and external air outlet opening maintain a fixed structure, then the structure is simple, but rain and foreign objects are likely to enter into the pipe hood and thus enter into the ventilating fan
Solution Approach 1:
The switching curtains are changed from fixed structure to movable structure that can dynamically adjust between open and closed states. The curtains are connected to the control system and can automatically close when rain or foreign objects are detected, and open during normal operation, providing adaptive protection while maintaining simple overall structure
3Ease of repair
If the front cover needs to be disassembled frequently for cleaning, then the cleaning work can be performed, but there is no satisfactory snapping structure making assembly and disassembly difficult
Solution Approach 1:
The front cover is equipped with a snapping structure that enables easy self-service assembly and disassembly by the user. The snapping mechanism allows the front cover to be quickly attached and detached without special tools or complex procedures, facilitating regular cleaning maintenance while improving operational convenience
4Loss of energy
If the partition plate is made of thermal conductive material, then heat exchange between discharged air and introduced air can occur, but the structure becomes more complex
Solution Approach 1:
The partition plate serves multiple functions: it divides the air passages into inlet and outlet sections, provides structural support, and acts as a heat exchange medium when made of thermal conductive material. This multi-functionality allows heat recovery without adding separate components, maintaining structural simplicity while enabling energy efficiency
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 design effectively prevents air recirculation, reduces contamination and foreign material entry, enhances energy efficiency through heat exchange, and simplifies assembly and cleaning, ensuring a safer and more efficient ventilating performance.
Implementation Method 1
a partition plate (150) is vertically provided in the rear cover (12) corresponding to the baffle (24) to divide the space enclosed by the front cover (11) and the rear cover (12) into an air inlet side (113) and an air outlet side (112)... the partition plate is made of thermal conductive material
Data Source
AI summary
An assembly of pipe hood and pipe unit for a ventilating fan, comprising a front cover, a rear cover and a pipe unit, characterized in that: a baffle is vertically provided in the pipe unit to divide the pipe into an air inlet pipe and an air outlet pipe on the left and right sides respectively; a partition plate is vertically provided in the rear cover corresponding to the baffle to divide the space enclosed by the front cover and the rear cover into an air inlet side and an air outlet side on the left and right sides respectively; an external air inlet opening and an external air outlet opening are provided on the outer side of the rear cover on the left and right sides respectively; an internal air inlet opening and an internal air outlet opening are provided on the inner side of the rear cover on the left and right sides respectively; an air inlet passage and an air outlet passage are formed in parallel to each other on the left and right sides respectively. Since the inflow air and the outflow air flow to the left and right sides respectively, the contaminated air discharged from the pipe unit can be prevented from mixing with the fresh air entering the room, and the ventilating effect can be ensured.