Grinding Disc Cover Airflow Structure for Motor Heat Dissipation
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Solution Overview
Problem
Conventional electric tool grinding machines experience inefficient heat dissipation due to short airflow cycles and turbulence, leading to waste heat accumulation, especially when not equipped with active dust suction structures.
Innovation Solution
The grinding disc cover design features a release port with a flow guiding section, an arcuate diversion section, and an air outlet section, devoid of vent holes other than the assembly and release ports, which directs airflow parallel to the grinding disc, utilizing the Coandă effect to prevent turbulence and enhance heat dissipation airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If vent holes are arranged at intervals in the lateral direction of the grinding disc cover, then air intake is provided for heat dissipation, but short flow problem occurs where adjacent vent holes cannot intake air efficiently and heat dissipation effect is limited
Solution Approach 1:
The invention removes the vent holes from the grinding disc cover lateral wall, extracting the problematic air intake structure. Instead, air intake is achieved through the air inlet hole in the grip body, eliminating the short flow problem caused by laterally spaced vent holes.
Solution Approach 2:
The airflow generating member acts as an intermediary that guides air from the grip body air inlet through the eccentric block to the motor housing, creating an efficient heat dissipation path without requiring lateral vent holes in the grinding disc cover.
2Device complexity
If the airflow generating member is disposed close to the vent holes, then air intake structure is simplified, but the vent holes cannot produce expected effect and short flow problem occurs
Solution Approach 1:
The invention extracts the vent holes from the system by removing them entirely from the grinding disc cover. Air intake is relocated to the grip body, eliminating the conflict between proximity to vent holes and air intake efficiency.
Solution Approach 2:
The grip body air inlet and airflow generating member work together as a self-service system where the airflow generator naturally draws air through the grip body inlet and directs it through the eccentric block, achieving efficient air intake without complex vent hole arrangements.
3Strength
If the inner wall of the grinding disc cover is an inclined surface facing the grinding disc, then the cover provides shielding function, but heat dissipation airflow is discharged directly to the grinding disc causing turbulence and affecting exhaust air
Solution Approach 1:
The invention removes the inclined surface inner wall structure from the grinding disc cover, extracting the source of turbulence. The cover inner wall is modified to have a smooth surface that guides airflow without causing turbulence or direct discharge onto the grinding disc.
Solution Approach 2:
The smooth inner wall surface of the grinding disc cover acts as an intermediary that guides the heat dissipation airflow from the eccentric block toward the motor housing without creating turbulence, ensuring efficient exhaust air flow.
4Volume of moving object
If the diameter of the shaft of the eccentric block connecting with the electric motor is small, then the structure is compact, but waste heat transfer speed is slow and heat accumulates continuously
Solution Approach 1:
The invention uses pneumatic flow (air current) generated by the airflow generating member to actively remove heat from the eccentric block and motor housing. The air current flows through the eccentric block and motor housing, carrying away waste heat efficiently despite the compact shaft diameter.
Solution Approach 2:
The air current acts as an intermediary heat transfer medium, carrying waste heat from the compact eccentric block and motor housing to the external environment, enabling effective heat dissipation without increasing structural size.
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 design significantly improves heat dissipation efficiency, reducing user discomfort and effectively managing heat accumulation in the electric motor, even without active dust suction structures, by ensuring smooth airflow and preventing direct discharge towards the grinding disc.
Implementation Method 1
utilizing the Coandă effect to prevent turbulence and enhance heat dissipation airflow
Data Source
AI summary
An electric tool grinding machine and a grinding disc cover thereof, the machine includes a grip body, an electric motor, a grinding disc, and an airflow generating member. When the motor rotates, the member forms a heat dissipation airflow in the grip body. The grinding disc cover is assembled with the grip body and covers the member therein. The grinding disc cover includes a cover body, an assembly port, and a release port facing the grinding disc, the cover body does not have a vent hole other than the assembly and release ports, when the release port is viewed from the assembly port toward the release port, an inner wall of the release port has a flow guiding section, an air outlet section with a slope different from that of the flow guiding section, and an arcuate diversion section connecting between the flow guiding and air outlet sections.