Rotating Optoelectronic Sensor Heat Exchange via Convective Air Gap
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Solution Overview
Problem
Optoelectronic sensors, such as laserscanners, face challenges in heat dissipation due to the rotating design of the optical unit, leading to insufficient heat exchange between the electronics and the environment, which affects the device's operating temperature, performance, and robustness.
Innovation Solution
The integration of heat exchange elements on the rotating optical unit with flat sides at a defined distance from the static housing creates convective heat exchange, enhancing air turbulence and heat transfer, using materials with high thermal conductivity like aluminum or copper, and connecting these elements thermally to the electronics for efficient heat absorption and dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat dissipation components are added to the rotating optical unit, then heat exchange is improved, but the weight and complexity of the rotor increases
Solution Approach 1:
The housing serves multiple functions: it provides structural enclosure and simultaneously acts as a heat dissipation component through integrated heat exchange elements. The housing's dual role eliminates the need for separate heavy heat dissipation components in the rotor, reducing rotor weight while maintaining effective heat dissipation.
Solution Approach 2:
Air acts as an intermediary heat transfer medium between the rotating optical unit and the static housing. The convective air flow in the gap between the rotor and housing enables heat transfer without requiring direct thermal contact or heavy heat dissipation components on the rotor itself.
2Temperature
If metal components are used to improve heat conduction in the rotor, then heat dissipation is enhanced, but the rotor becomes heavier and less robust
Solution Approach 1:
The heat dissipation function is extracted from the rotating optical unit and transferred to the static housing. By removing the need for heavy metal heat conduction components in the rotor, the rotor's robustness against shock and vibration is improved while heat dissipation is maintained through the housing's heat exchange elements.
Solution Approach 2:
Direct mechanical thermal conduction through heavy metal components is replaced by convective heat transfer through air flow. This substitution eliminates the need for heavy metal heat conduction structures in the rotor, improving its mechanical robustness while maintaining heat dissipation effectiveness.
3Temperature
If heat is dissipated through the bearing and motor, then heat removal is attempted, but the heat dissipation capacity is severely limited
Solution Approach 1:
Heat dissipation is moved from the limited one-dimensional path through bearings and motor to a two-dimensional convective heat exchange surface in the gap between the rotor and housing. This dimensional expansion of the heat dissipation interface significantly increases heat transfer capacity.
Solution Approach 2:
The heat transfer mechanism is changed from conductive heat transfer through solid components (bearings, motor) to convective heat transfer through air flow. This parameter change in the heat transfer mode dramatically increases heat dissipation efficiency by utilizing the larger surface area and higher heat transfer coefficient of convection.
4Temperature
If air cooling is used around the rotor, then heat dissipation is attempted, but the constant rotation creates stable flow with low relative velocity and reduced heat transport
Solution Approach 1:
The static air cooling approach is transformed into a dynamic convective cooling system where the rotating rotor actively generates air flow. The rotation of the rotor with its heat exchange elements creates dynamic air circulation in the gap, maintaining high relative velocity between the heat surfaces and air, thereby enhancing heat transport efficiency.
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 solution improves heat dissipation, reduces the weight of mechanical components, decreases energy consumption, and maintains robustness by increasing convective heat transfer between the rotating electronics and the static housing, thus maintaining a permissible operating temperature and performance.
Implementation Method 1
flat sides of the heat exchange elements are located at a defined distance from an inside of the housing to provide convective heat exchange with the housing
Implementation Method 2
using materials with high thermal conductivity like aluminum or copper, and connecting these elements thermally to the electronics for efficient heat absorption and dissipation
Data Source
AI summary
To achieve improved heat transfer of an optoelectronic sensor to its environment, the optoelectronic sensor comprises a rotating optical unit with at least one light transmitter for emitting light beams, at least one light receiver for receiving light remitted by objects in the monitored area, and associated electronics for controlling the optical unit, a drive unit for rotating the optical unit, a housing for enclosing at least the optical unit, the housing having at least one window region which transmits transmitted light beams and received light, and heat exchange elements provided on the outside of the optical unit and arranged in such a way that the heat exchange elements rotate with the optical unit and flat sides of the heat exchange elements lie at a defined distance from an inner side of the housing in order to provide convective heat exchange with the housing.