Mower Blade Air Circulator for Grass Transport
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Solution Overview
Problem
Conventional mower blades face challenges in generating sufficient airflow in the transport direction of cut grass, with existing designs either directing airflow too far outward or inward, leading to inefficient air circulation and potential interference between adjacent airflows.
Innovation Solution
The mower blade features a blade main body with a blade portion and an air circulator portion that spans from the length-direction end to a predetermined area, where the air circulator portion is bent and inclined to face inward, maintaining a substantially fixed height and increasing surface area, reducing space between the mowing chamber wall, and optimizing airflow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fan blade extends parallel to the cutting blade along the long side of the plate-shaped member, then the structure is simple, but the airflow in the transport direction of cut grass is insufficient
Solution Approach 1:
The mower blade is divided into two distinct functional portions: a cutting blade portion and a fan blade portion. The fan blade portion is further segmented into multiple fan blades extending from the blade body, allowing each segment to perform its specific function optimally while contributing to overall airflow generation in the transport direction
Solution Approach 2:
The fan blade portion is configured to extend in a direction that is not parallel to the cutting blade, creating a three-dimensional arrangement. The fan blades extend from the blade body at angles that direct airflow inward toward the center of rotation, adding a new dimensional aspect to airflow generation that complements the cutting function
2Productivity
If the fan blade faces inward to generate airflow in the transport direction, then airflow performance improves, but the space between lateral sides decreases creating a tapering shape that reduces airflow
Solution Approach 1:
Different portions of the fan blade are given different local qualities: the root portion near the blade body has a wider cross-section to maintain structural integrity and airflow generation, while the tip portion tapers gradually. Each cross-section of the fan blade is optimized for its specific location, with the inner lateral side having different dimensions than the outer lateral side, allowing the blade to maintain effective airflow generation throughout its length without the uniform tapering problem
3Ease of manufacture
If the boundary portion between blade main body and air circulator portion is perpendicular to the blade portion, then manufacturing is simple, but airflow circulation performance is insufficient
Solution Approach 1:
The boundary portion between the blade main body and the air circulator portion is configured with a curved or inclined surface rather than a perpendicular junction. This curved transition optimizes airflow by eliminating sharp edges that would cause turbulence, allowing air to flow smoothly from the cutting area through the air circulator portion and enhancing overall circulation performance within the housing
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 enhances airflow directionality and circulation performance, ensuring effective transport of cut grass while preserving a sharpened blade area for extended usage and reducing energy consumption.
Implementation Method 1
an air circulator portion generated airflow by rotation centered around a vertically-oriented axis of the mower blade
Data Source
AI summary
Mower blade utilizes a blade portion formed on the blade main body and an air circulator portion formed on the blade main body and generating airflow via rotation centered around the vertically-oriented axis of the mower blade. The blade portion is arranged in a length-direction end portion of the blade main body and extends along a predetermined area in the length-direction. The air circulator portion is located opposite the blade portion in a width direction, has a rising upward portion, and extends along a predetermined area in the length-direction. A boundary portion is arranged between the blade main body and a rising upward portion of the air circulator portion has a portion inclined or angled with respect to the blade portion such that, beginning at the length-direction end portion, a distance between the boundary portion and the blade portion increases along the length-direction and moving toward the vertically-oriented axis. A height of an upper end portion of the air circulator portion measured from a surface of the blade main body is a substantially constant height.