Bladeless Fan Filter Airflow Distribution and Replacement
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Solution Overview
Problem
Current bladeless fan designs with air filters suffer from uneven airflow distribution, leading to premature filter degradation and increased replacement costs due to differential suction forces across the filter surface, and a cumbersome filter replacement process.
Innovation Solution
The design features a bladeless fan with first and second air inlets arranged along a direction, a filter mounted between them, and a diffusion passage guiding airflow uniformly across the filter surface, along with a nozzle with a heater and insulation passage to enhance airflow distribution and filter usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If air inlet meshes are arranged on the entire surface of the outer shell to maximize filtration area, then the filter area is increased, but the suction force becomes uneven across different heights causing premature filter degradation
Solution Approach 1:
The patent applies local quality by creating different airflow path lengths for different regions of the filter. The diffusion passage structure ensures that air from both upper and lower inlet meshes travels through paths of comparable length to reach the fan motor unit, equalizing suction force distribution across the filter surface. This prevents localized over-use and extends overall filter lifespan while maintaining maximum filter area.
2Reliability
If the filter is sealed with a three-dimensional sealing strip to ensure sealing effect, then the sealing performance is improved, but the replacement process becomes cumbersome requiring disassembly of two shells
Solution Approach 1:
The patent applies segmentation by separating the filter assembly into modular components that can be independently accessed and replaced. The filter is designed as a detachable module that can be removed and installed without disassembling the main shell structures, maintaining effective sealing while dramatically simplifying the replacement process for user convenience.
3Productivity
If the fan motor unit is positioned to maximize air suction from lower inlet meshes, then the air intake efficiency is improved, but the upper filter areas are underutilized leading to resource waste
Solution Approach 1:
The patent introduces a diffusion passage as an intermediary structure between the air inlet meshes and the fan motor unit. This diffusion passage redistributes airflow from both upper and lower inlet regions, ensuring that air from all parts of the filter reaches the fan motor unit with relatively equal suction force. This maximizes the utilization of the entire filter surface area, preventing resource waste while maintaining efficient air intake.
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 ensures more even airflow through the filter, prolongs its lifespan, reduces replacement frequency, and simplifies the filter replacement process, thereby lowering costs and improving indoor air quality.
Implementation Method 1
a heater is provided in an inner passage of the nozzle, and at least a part of the airflow received in the inner passage passes through the heater and is discharged from an outlet of the nozzle
Implementation Method 2
an insulation passage is formed between the heater and an inner wall of the air collecting chamber
Data Source
AI summary
The disclosure describes a fan, which includes a body, the body includes a first air inlet, a second air inlet, an air outlet, and a fan motor for generating an air flow passing through the body, wherein the first air inlet and the second air inlet are arranged at interval in a first direction; a nozzle, which is connected with the air outlet and used for receiving the air flow from the body and ejecting the air flow; and a filter, which is arranged in a region between the first and the second air inlet in the body, and disposed downstream of the air inlet. The fan makes the air pass through the filter more evenly, prolongs the life of the filter, reduces filter replacements, reduces the cost of the air purifier, and is more conducive to the improvement of the indoor environment and provides a cleaner living environment.