Full-heat ventilation fan having double-layer air duct
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Solution Overview
Problem
Existing fresh air blowers with complicated air duct structures suffer from low ventilation efficiency, high wind resistance, and poor user experience due to their inability to adjust working modes according to environmental conditions.
Innovation Solution
A full-heat fresh air blower with a double-layer air duct structure, where the downstream section of the fresh air duct and upstream section of the return air duct are arranged in upper and lower layers, allowing for streamlined airflow and cross heat exchange, along with a bypass air duct at the periphery of the full heat exchange core for efficient operation in various modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple air duct structure is used, then the device complexity is reduced, but the ventilation efficiency and adaptability to different environmental conditions deteriorate
Solution Approach 1:
The air duct system is segmented into multiple independent channels including fresh air duct, return air duct, bypass duct, and waste heat recovery duct. Each duct serves a specific function, allowing the system to maintain simple individual duct structures while achieving complex ventilation functions through their coordinated operation. This segmentation enables independent control of each air flow path, improving ventilation efficiency without requiring a monolithic complex structure.
Solution Approach 2:
The air duct system is designed with multi-functionality where the same duct structure serves multiple purposes. For example, the bypass duct can operate in different modes (bypass mode and heat recovery mode) depending on environmental conditions. The waste heat recovery duct simultaneously performs heat exchange and air transport functions. This multi-functionality allows the system to adapt to different ventilation requirements without adding unnecessary structural complexity.
2Adaptability or versatility
If a complicated air duct structure is used to achieve multiple working modes, then the adaptability is improved, but the device complexity and wind resistance increase
Solution Approach 1:
The air duct system incorporates dynamic control through adjustable dampers and control valves in each duct channel. These dynamic elements allow the system to switch between different working modes (full heat exchange mode, bypass mode, partial heat exchange mode) by adjusting the opening degree of dampers. This dynamic adjustment capability provides adaptability to different environmental conditions without requiring a completely different duct structure for each mode, thereby avoiding excessive structural complexity.
Solution Approach 2:
The patent introduces a bypass dimension parallel to the main heat exchange path. The bypass duct runs parallel to the waste heat recovery duct, providing an alternative air flow path. This dimensional addition allows the system to switch between heat recovery and bypass modes without complicating the main heat exchange structure, as the bypass operates in a parallel dimension. The waste heat recovery duct and bypass duct together create a multi-dimensional air flow network that enhances adaptability while maintaining structural simplicity.
3Adaptability or versatility
If a complicated air duct structure is used, then multiple working modes are achieved, but the wind resistance increases and ventilation efficiency decreases
Solution Approach 1:
Each air duct channel is designed with optimized local geometry to minimize wind resistance in its specific flow path. The fresh air duct, return air duct, bypass duct, and waste heat recovery duct each have streamlined cross-sections and smooth transitions tailored to their flow requirements. This local optimization ensures that air flow encounters minimal resistance within each duct, even though multiple ducts coexist in the system. The local quality approach allows multiple working modes to be achieved without proportionally increasing overall wind resistance.
Solution Approach 2:
The patent merges the heat exchange function and air transport function into integrated duct structures. The waste heat recovery duct simultaneously serves as both a heat exchanger and an air transport channel, eliminating the need for separate heat exchange equipment and transport ducts. This merging reduces the total number of components and connections, thereby reducing cumulative wind resistance. The bypass duct is similarly integrated into the overall duct network, allowing mode switching without adding isolated complex structures that would increase resistance.
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 reduces wind resistance, improves heat exchange efficiency, and enhances user experience by allowing for adjustable working modes, increased air supply efficiency, and a compact, lightweight design.
Implementation Method 1
outdoor fresh air can exchange heat with exhausted air from a room to recover the heat within the full-heat exchange core
Implementation Method 2
heat exchange between the fresh air and the return air
Implementation Method 3
the fresh air passage and the return air passage can have a streamlined structure in the vertical plane, which is not only advantageous for reducing the wind resistance during the circulation of the fresh air and the return air
Implementation Method 4
the fresh air passage and the return air passage are arranged to cross each other in the vertical plane, so that cross heat exchange between the fresh air and the return air is realized
Data Source
Figure 1
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AI summary
A full-heat ventilation fan (1) having a double-layer air duct, comprising: a fresh air duct that communicates with an outdoor air inlet (121) and an indoor air outlet (124), and comprises a first downstream section; an air return duct that communicates with an indoor air inlet (123) and an outdoor air outlet (122), and comprises a first upstream section; and a full-heat exchange core (15), which comprises a fresh air channel and an air return channel that can carry out heat exchange, the fresh air channel being disposed within the fresh air duct or forming a part of the fresh air duct, the air return channel being disposed within the air return duct or forming a part of the air return duct, and part of the first downstream section and part of the first upstream section being upper and lower layers within the vertical plane, so as to form a double-layer air duct. The full-heat ventilation fan not only helps to reduce wind resistance and improve efficiency, but also achieves low noise operation.