Centrifugal Fan Air Baffle Ring for Higher Airflow and Lower Noise
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Solution Overview
Problem
Conventional centrifugal fans in terminal products like laptops and tablets fail to meet heat dissipation requirements due to a relatively small air supply volume, leading to increased noise and reduced performance.
Innovation Solution
A centrifugal fan design incorporating a C-shaped air baffle ring around the air inlet to prevent air leakage in the pressurization area, combined with a larger gap in the release area to enhance air supply and reduce noise, utilizing an integrated or separated structure for the baffle ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gap between the impeller and air inlet is reduced to prevent air leakage, then air supply volume increases, but air flow resistance increases and noise increases
Solution Approach 1:
The patent divides the air inlet area into two distinct regions: a first air inlet area with a smaller gap to the impeller for reducing air leakage, and a second air inlet area with a larger gap for reducing air flow resistance and noise. This segmentation allows each region to optimize for its specific function, resolving the contradiction between preventing leakage and reducing noise.
Solution Approach 2:
Different gap sizes are applied to different local regions of the air inlet. The first air inlet area has a first gap size optimized for leakage prevention, while the second air inlet area has a second gap size optimized for noise reduction. This local differentiation allows the system to address multiple contradictory requirements in different spatial locations simultaneously.
2Object-affected harmful factors
If the gap between the impeller and air inlet is increased to reduce noise, then air leakage increases, but air supply volume decreases
Solution Approach 1:
The air inlet is segmented into two regions with different gap characteristics. The first air inlet area maintains a smaller gap to preserve air supply volume and prevent leakage, while the second air inlet area uses a larger gap for noise reduction. This segmentation ensures that noise reduction measures do not compromise overall air supply performance.
Solution Approach 2:
The patent applies different gap qualities to different local areas of the air inlet. By making the gap size location-dependent, the system can locally optimize for noise reduction in the second air inlet area while maintaining adequate air supply volume through the first air inlet area with its smaller gap.
3Productivity
If a complete air baffle ring is installed around the entire air inlet to prevent air leakage, then air supply volume increases, but device complexity increases
Solution Approach 1:
Instead of implementing a complete air baffle ring around the entire air inlet, the patent segments the baffle structure to be installed only in the first air inlet area. This partial segmentation reduces the complexity of the baffle structure while still achieving the primary goal of preventing air leakage and increasing air supply volume.
Solution Approach 2:
The patent extracts the air baffle ring from being a complete circumferential structure and implements it only where most needed - in the first air inlet area. This extraction removes unnecessary structural complexity from regions where it is not needed (the second air inlet area) while maintaining the essential function of preventing air leakage.
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 increases air volume and reduces noise by effectively isolating air flows, improving the air supply effect and maintaining smooth air circulation, thus enhancing heat dissipation performance.
Implementation Method 1
an air baffle ring that prevents air in the pressurization area from leaking through the air inlet is further disposed in the housing
Implementation Method 2
A static pressure and a flow velocity of an air flow are gradually increased in the pressurization area along a rotation direction of the impeller
Data Source
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AI summary
This application provides a centrifugal fan and a terminal. The centrifugal fan is applied to a terminal. During disposition, the centrifugal fan includes a housing, and the housing is configured to accommodate an impeller. The impeller rotates relative to the housing. A flow channel that cooperates with the impeller is disposed in the housing. The flow channel includes a pressurization area. In the pressurization area, a static pressure and a flow velocity of an air flow are gradually increased along a rotation direction of the impeller. However, an air inlet is disposed on the housing, and there is a specific gap between the impeller and the air inlet. As a result, when air flows through the pressurization area, there is a specific amount of leakage through the gap. Therefore, an air baffle ring is disposed in the centrifugal fan provided in this application. The air baffle ring is disposed around only a part of the air inlet, to prevent air in the pressurization area from leaking, and well separate an air flow in the pressurization area from an air flow at the air inlet, thereby increasing a pressurization effect, and reducing a loss caused by mixture of an incoming air flow and an air flow in the pressurization area in a volute. In this way, an air volume of the fan is increased, and noise of the fan is reduced.