Air Compressor Cooling Fan With Mixed Blade Types
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Solution Overview
Problem
Air compressors face challenges in effectively cooling the motor due to the centrifugal force of the cooling fan's air stream, which tends to flow outward, leading to heat accumulation and reduced cooling efficiency.
Innovation Solution
The air compressor design incorporates a cooling fan with outer and inner blades, where the inner blades are configured to direct airflow along the rotational shaft, enhancing airflow towards the motor and heat generation components, and a partition between the blades to improve airflow distribution and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is provided to cool the motor and compression part, then cooling function is provided, but the air stream flows in outer peripheral direction due to centrifugal force making it difficult to promote airflow in the motor
Solution Approach 1:
The cooling fan is divided into separate functional components: outer blades for generating centrifugal force and supplying air to the compression part, and inner blades for directing air along the rotational shaft into the motor. This segmentation allows each blade type to optimize its function independently, resolving the contradiction between providing cooling and maintaining effective airflow distribution.
Solution Approach 2:
Different regions of the cooling fan are designed with different blade characteristics. The outer blades are optimized for centrifugal air supply to the compression part, while the inner blades are optimized for axial airflow into the motor. This local differentiation ensures that each region of the motor and compression assembly receives appropriate cooling airflow tailored to its specific thermal requirements.
2Productivity
If the cooling fan generates high centrifugal force air stream, then air can be supplied to the compression part, but the air stream is likely to flow in outer peripheral direction and heat accumulates in the motor
Solution Approach 1:
The cooling fan is divided into separate functional components: outer blades for generating centrifugal force and supplying air to the compression part, and inner blades for directing air along the rotational shaft into the motor. This segmentation allows each blade type to optimize its function independently, resolving the contradiction between providing cooling and maintaining effective airflow distribution.
Solution Approach 2:
The inner blades act as an intermediary mechanism that captures the centrifugal air stream generated by the outer blades and redirects it along the rotational shaft into the motor. This intermediary function allows the system to maintain high centrifugal force for compression part cooling while simultaneously delivering air to the motor, preventing heat accumulation.
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 cooling performance by promoting airflow within the motor and heat generation areas, effectively reducing temperature increases and improving the overall cooling efficiency of the air compressor.
Implementation Method 1
an air stream generated by the cooling fan has a high centrifugal force and is thus likely to flow in an outer peripheral direction
Data Source
AI summary
In an air compressor, inner blades of a cooling fan are formed into a centrifugal type, and outer blades are formed into an axial flow type. Exterior air is sucked through a ventilating window by the outer blades, and an air stream (CA1) is generated. A part of the generated air stream flows towards a stator coil, like an air stream (CA2). By a negative pressure generated by the inner blades, the air in the vicinity of the stator coil is sucked to the inner blades, like an air stream (CA3). The sucked air flows out from a motor-side opening towards a non-motor-side opening by a negative pressure generated by the outer blades, is sucked to the outer blades like an air stream (CA4) and flows out together with the air stream (CA1).