Dual-Fan Airflow Rectification for Transmission Cooling in Work Machines
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Solution Overview
Problem
Existing drilling tools face inefficiencies in cooling the transmission mechanism due to reliance on dust collection air for cooling, with cooling air being directly exhausted outside, leading to inadequate heat management and reduced durability.
Innovation Solution
A work machine design incorporating a rectification member with centrifugal fans and a fan guide that integrates cooling and dust collection airflows, redirecting them to efficiently cool the transmission mechanism by aligning airflow directions to enhance cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is directly exhausted from radially outside the cooling fan to the outside of the drilling tool, then the structure is simple, but the cooling performance of the transmission mechanism is insufficient
Solution Approach 1:
The patent merges the cooling airflow path with the dust collection airflow path by introducing a rectification member that redirects both airflows to pass through the transmission mechanism. The cooling fan generates cooling air that flows axially through the transmission mechanism, while the dust collection fan generates dust collection air that also passes through the transmission mechanism after being rectified. This combination allows both airflow functions to work together to improve cooling performance without adding separate complex cooling pathways.
Solution Approach 2:
The rectification member acts as an intermediary component that modifies the airflow direction from radial to axial, enabling the cooling air to effectively pass through the transmission mechanism. This intermediary structure is necessary to transform the airflow characteristics so that the cooling function can be properly implemented without requiring complete redesign of the fan system.
2Temperature
If only a portion of the dust collection air is used to cool the transmission mechanism, then the dust collection function is maintained, but the cooling efficiency of the transmission mechanism is reduced
Solution Approach 1:
The patent combines the cooling airflow from the cooling fan with the dust collection airflow from the dust collection fan by using the rectification member to redirect both flows axially through the transmission mechanism. This merging allows the full capacity of both fans to contribute to cooling the transmission mechanism, significantly improving cooling efficiency compared to using only a portion of dust collection air.
Solution Approach 2:
The rectification member enables the dust collection airflow path to serve dual functions: dust collection and cooling. By redirecting the dust collection air axially through the transmission mechanism, the system utilizes the dust collection fan's full capacity for cooling purposes while maintaining its primary dust collection function, achieving multi-functionality without additional fans.
3Temperature
If the cooling air flows directly outside the transmission mechanism, then the airflow path is short and simple, but the heat dissipation effectiveness is reduced
Solution Approach 1:
The patent changes the airflow direction from radial (outside the transmission mechanism) to axial (through the transmission mechanism) by introducing the rectification member. This dimensional change in airflow direction allows the cooling air to pass through the transmission mechanism along its axis, maximizing contact between the cooling air and the heat-generating components, thereby significantly improving heat dissipation effectiveness.
Solution Approach 2:
The rectification member serves as an intermediary that transforms the airflow characteristics, converting radial flow into axial flow that passes through the transmission mechanism. This intermediary component is essential for achieving effective heat dissipation by ensuring the cooling air traverses the transmission mechanism rather than bypassing it.
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
Improved cooling performance of the transmission mechanism through integrated airflow redirection, enhancing durability and operational efficiency of the drilling tool.
Implementation Method 1
The first fan and the second fan are centrifugal fans
Implementation Method 2
a rectification member, accommodating the first fan and the second fan therein, and, when the output shaft rotates to one side in a rotation direction, causing a first airflow blown out from the first fan and a second airflow blown out from the second fan to join together and flow out toward one side in the axial direction
Implementation Method 3
a transmission mechanism for transmitting a driving force of the motor to a drill bit is operated by the driving force of the motor. Thus, the transmission mechanism undergoes a temperature rise due to frictional heat during operation
Data Source
AI summary
A work machine includes: a motor; an output shaft, rotated by driving of the motor; a first fan, fixed to and rotating integrally with the output shaft; a second fan, located on one side of the first fan in an axial direction of the output shaft, fixed to and rotating integrally with the output shaft; and a rectification member, accommodating the first and second fans, and, when the output shaft rotates to one side in a rotation direction, causing a first airflow blown out from the first fan and a second airflow blown out from the second fan to join together and flow out toward one side in the axial direction. The rectification member includes a rectification section in which the second airflow is rectified to flow to the one side in the axial direction and is prevented from flowing to the other side in the axial direction.