Vacuum Cleaner Blower Guide Vanes for Low-Noise High Static Pressure
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Solution Overview
Problem
Blower apparatuses in vacuum cleaners experience noise issues due to air separation at high-speed operation, which is a concern for consumer products requiring low noise levels while maintaining high static pressure.
Innovation Solution
The design incorporates a blower apparatus with a motor portion, an impeller, an impeller cover, a body cover, and guide vanes arranged in a tubular space, where the guide vanes are inclined and have varying thicknesses to guide air smoothly and reduce noise, maintaining high static pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plate-shaped air guides are used to guide air downward from the impeller, then air flow guidance is achieved, but air separation occurs at high speeds causing noise
Solution Approach 1:
The patent replaces plate-shaped air guides with curved guide vanes that have a smooth arc-shaped surface. This curvature allows air to follow the natural flow path without abrupt changes in direction, preventing flow separation and the resulting noise while maintaining effective air guidance from the impeller outlet.
Solution Approach 2:
The guide vanes are designed with specific geometric parameters including a curved surface with a predetermined radius of curvature, and the lower end is positioned forward relative to the upper end in the rotation direction. These parameter changes optimize the flow path to eliminate separation at high speeds while maintaining guidance effectiveness.
2Stress or pressure
If the blower apparatus is designed for high static pressure, then blowing performance is improved, but air separation and noise increase at high speeds
Solution Approach 1:
The curved surface of the guide vanes with optimized radius of curvature enables the apparatus to maintain high static pressure by efficiently directing air flow without creating turbulence or separation, even at high operating speeds where noise would normally increase.
3Productivity
If guide vanes are designed with inclination to guide air efficiently, then air blowing efficiency improves, but complex geometry increases manufacturing difficulty
Solution Approach 1:
The guide vanes feature a curved surface with a predetermined radius of curvature that can be manufactured using standard molding or machining processes. This curvature achieves efficient air guidance and high blowing performance while remaining practical for mass production, avoiding overly complex geometries.
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 solution effectively reduces noise while maintaining high static pressure, improving air blowing efficiency and reducing air resistance, thus enhancing the performance of the blower apparatus.
Implementation Method 1
a plurality of guide vanes arranged in a circumferential direction in the tubular space, and each of which is arranged to extend in a radial direction between an inner surface of the body cover portion and the housing tubular portion
Implementation Method 2
an impeller arranged above the motor portion, joined to a rotating portion of the motor portion, and arranged to rotate to send a gas from above radially outward
Data Source
AI summary
A blower apparatus includes a motor portion having a central axis extending in a vertical direction; an impeller arranged above the motor portion, joined to a rotating portion of the motor portion, and arranged to rotate to send a gas from above radially outward; an impeller cover portion including an inner surface arranged to cover an outer circumference of the impeller and an upper side of an outer edge portion of the impeller, and further including an air inlet defined in a center thereof; a body cover portion joined to the impeller cover portion, arranged to cover an outer circumference of the motor portion, and arranged to define a tubular space between the body cover portion and a housing tubular portion defining an outer surface of the motor portion and extending in the vertical direction to assume a tubular shape; and a plurality of guide vanes arranged in a circumferential direction in the tubular space, and each of which is arranged to extend in a radial direction between an inner surface of the body cover portion and the housing tubular portion. Each of the guide vanes includes a guide vane upper portion arranged on an upper side, and a guide vane lower portion arranged on a lower side of the guide vane upper portion. The guide vane upper portion is inclined to a greater degree with respect to an axial direction than the guide vane lower portion. A lower end of the guide vane is arranged forward of an upper end of the guide vane with respect to a rotation direction of the impeller. The lower end of at least one of the guide vanes is arranged above a lower end of the housing tubular portion.