Compact Blow Dryer Air Duct Design for Stable High-Speed Flow
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Solution Overview
Problem
Existing high-speed blow dryers face issues with intermittent airflow and vibration due to the interaction between impeller vanes and guide vanes, leading to inefficiencies and reduced stability.
Innovation Solution
A compact continuous high-speed blow dryer design featuring an optimized air duct with guide vanes and an air guide pad, along with a rotor assembly supported by balance weights and a swivel bearing, to stabilize the fan blade and ensure smooth airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the impeller rotates at high speed with conventional guide vane design, then the blow dryer achieves high airflow output, but the airflow becomes intermittent and gushing, causing instability and vibration
Solution Approach 1:
The guide vanes are designed with circular arc airfoil shapes and curved connected paths between the outer duct, inner duct, and guide vanes. This curvature design optimizes airflow patterns, eliminating intermittent gushing and achieving continuous stable airflow while maintaining high-speed rotation
Solution Approach 2:
The patent optimizes specific parameters including the ratio of impeller diameter to vane length (29:11), the inclination angles of vanes and guide vanes (20°-30°), and the uniform distribution of guide vanes. These parameter changes transform the airflow from intermittent to continuous while maintaining high productivity
2Speed
If the vanes and guide vanes are designed with fixed angles for high-speed operation, then the impeller generates strong airflow, but the gushing air reacts on the impeller causing vibration and reduced service life
Solution Approach 1:
The circular arc airfoil shape of guide vanes and curved connected paths smooth out airflow transitions, eliminating turbulent gushing that causes vibration. This allows high-speed operation without the harmful air reactions that would otherwise reduce service life
Solution Approach 2:
The design achieves continuous stable airflow rather than intermittent gushing, ensuring smooth air entry into axial guide vanes and preventing reactive forces on the impeller. This continuity maintains reliable operation at high speeds
3Volume of moving object
If the air duct design is simplified for compactness, then the blow dryer size is reduced, but the airflow becomes less smooth and efficiency decreases
Solution Approach 1:
The air duct employs a nested structure with an inner duct sleeved on the rotor assembly and an outer duct surrounding it, both sharing the same center axis. This compact nested arrangement maintains efficient airflow paths while minimizing the overall device volume
Solution Approach 2:
The curved connected paths in the nested duct structure optimize airflow smoothness despite the compact size, ensuring that the nested arrangement does not compromise airflow 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
The design achieves stable, continuous airflow with reduced wind resistance, enhancing operational efficiency and extending the service life of the fan.
Implementation Method 1
a swivel bearing, a first balance weight, a second balance weight and an auxiliary bearing along a length direction of the rotating shaft, the first balance weight and the second balance weight are respectively arranged at two ends of the rotating shaft and serve as stable supports
Implementation Method 2
the spring, the bearings and the air guide pad further stabilize the position of the fan blade and avoid centrifugal vibration of the fan blade
Implementation Method 3
When the impeller rotates, air enters the impeller axially from the air inlet. When the air is pushed by the vanes on the impeller, the energy of the air rises. Then, the air flows into the guide vanes and is guided by the guide vanes to the outside.
Implementation Method 4
a plurality of uniformly distributed guide vanes are connected and fixed between the air outlet portion and the outer duct, the guide vanes are each arranged in the shape of a circular arc airfoil
Implementation Method 5
the guide vanes are each arranged in the shape of a circular arc airfoil
Implementation Method 6
the first balance weight and the second balance weight are respectively arranged at two ends of the rotating shaft and serve as stable supports
Data Source
AI summary
The disclosure relates to the technical field of blow dryers, and in particular to a compact continuous high-speed blow dryer. By improving optimized design of an air duct, while a wind resistance coefficient of guide vanes is reduced, values of flow rates in paths can be ensured, so that a fluid can be led out of the air duct linearly and uniformly and a fan blade can operate stably. Auxiliary support structures such as a spring, bearings and an air guide pad further stabilize a position of the fan blade and avoid centrifugal vibration of the fan blade, which eventually reacts on a rotating shaft and affects rotational efficiency of the rotating shaft. Therefore, an operating environment of the fan blade is greatly improved, and overall efficiency of the fan is improved, Moreover, since the operating environment of the fan blade is optimized, stability of the fan is enhanced, and further, service life of the fan is prolonged.