Tilted Centrifugal Blower Layout for Quiet Ceiling Ventilation
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Solution Overview
Problem
Conventional ceiling-embedded ventilation fans experience increased resistance loss and reduced airflow when ducts are inflected or longer, leading to higher noise levels at high static pressures and decreased airflow at low static pressures due to the design limitations of centrifugal blower blades.
Innovation Solution
The centrifugal blower blade is tilted to direct airflow orthogonally, increasing the air course width enlargement ratio from the blade intake port to the opposite side, enhancing ventilation capability across a wide range of static pressures while maintaining low noise levels by optimizing blade exposure and airflow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the outer circumferential speed of the impeller is increased to increase airflow intensity at high static pressure, then the airflow intensity is improved, but the noise value increases
Solution Approach 1:
The invention changes the geometric parameters of the centrifugal blower blade by tilting the upper side of the axial center toward the upstream side of centrifugal airflow. This parameter modification optimizes the blade angle and airflow direction, enabling effective airflow generation at lower rotation speeds, thereby reducing noise while maintaining productivity
Solution Approach 2:
The invention introduces dynamic optimization of the blade configuration to adapt to varying static pressure conditions. By tilting the blade axial center, the system dynamically adjusts airflow characteristics across different operating conditions, maintaining efficient airflow at both high and low static pressure without requiring constant high-speed operation
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 configuration ensures reliable airflow at varying static pressures without increasing motor rotation speed, reducing noise and maintaining airflow performance from low to high static pressure levels.
Implementation Method 1
centrifugal blower blade 109 housed in casing 108 to blow air
Data Source
AI summary
A ceiling-embedded ventilation fan includes: a casing provided in a box-shape frame inserted and mounted in a ceiling and having an opening facing an indoor side in a lower face thereof, the casing having a side face formed in a scroll shape and set in a vertical direction, the casing further having a casing intake port in the lower face of the frame and a casing discharge port in a side portion of the frame; a centrifugal blower blade housed in the casing and having a blade intake port facing the casing intake port; and an electric motor which rotates the centrifugal blower blade, wherein the centrifugal blower blade is provided so that an upper side of an axial center thereof is tilted in a direction toward an upstream side of a centrifugal airflow based on a center line of the casing intake port in a direction orthogonal to the casing discharge port.