Vacuum Transport Robot Thermal Management via High Radiation Surfaces
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Solution Overview
Problem
Conventional vacuum robots used in vacuum chambers for transporting high-temperature substrates face issues with thermal management, leading to high temperatures and operational errors due to low thermal conductivity in bearings and high reflectivity of inner chamber walls, which results in inefficient heat dissipation and frequent maintenance needs.
Innovation Solution
The design incorporates a transport robot with a base portion and arm featuring high radiation ratio surfaces treated to enhance thermal emission, a heat-receiving plate, and a reflector to direct radiant heat away from the robot, allowing for efficient heat transfer to the vacuum chamber, reducing the robot's temperature and minimizing lubrication oil evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional bearing with low thermal conductivity is used to support the vacuum robot arm, then the bearing provides adequate mechanical support, but heat accumulates in the arm instead of escaping to the vacuum chamber
Solution Approach 1:
The patent applies surface treatment to specific portions of the vacuum robot (base portion and arm) to increase their radiation ratio. This changes the thermal radiation parameter of these surfaces, enabling more efficient heat dissipation from the robot arm to the vacuum chamber, thereby resolving the heat accumulation problem while maintaining operational reliability
Solution Approach 2:
The patent converts the harmful effect of high reflectivity of vacuum chamber walls (which causes thermal energy to be reflected back to the robot) into a beneficial effect by introducing high radiation ratio portions that actively emit thermal energy. The treated surfaces with increased radiation ratio enable the robot to efficiently radiate heat to the chamber walls, transforming the thermal management challenge into an effective heat dissipation mechanism
2Reliability
If the vacuum chamber inner walls are polished to suppress emitted gas, then the chamber maintains vacuum quality, but the inner wall surfaces have low radiation ratio and high reflectivity, causing thermal energy to be reflected back to the robot
Solution Approach 1:
The patent applies surface treatment only to specific portions of the vacuum robot (the base portion and arm that need heat dissipation), rather than treating the entire robot or the vacuum chamber walls. This localized application of high radiation ratio portions allows the robot to efficiently radiate heat while maintaining the overall vacuum chamber quality and polish
Solution Approach 2:
The patent addresses the harmful reflection of thermal energy from the polished chamber walls by equipping the robot with high radiation ratio portions that actively emit thermal energy. This transforms the thermal management issue caused by high-reflectivity chamber walls into an effective heat dissipation solution through the robot's own radiative surfaces
3Ease of operation
If lubrication oil is used in the bearing, then the bearing provides adequate lubrication at normal temperatures, but the lubrication oil evaporates when the robot reaches high temperature in vacuum
Solution Approach 1:
By increasing the radiation ratio of the robot's surfaces through surface treatment, the patent changes the thermal radiation parameter to enable more efficient heat dissipation. This parameter change prevents the robot from reaching high temperatures that would cause lubrication oil evaporation, thereby maintaining bearing lubrication reliability without requiring expensive solid-lubricated bearings
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 effectively suppresses temperature rise in the transport robot, reduces operational errors, and minimizes maintenance requirements by efficiently transferring heat from the substrate to the vacuum chamber, maintaining the robot's temperature and preventing thermal expansion issues.
Implementation Method 1
A release-side high radiation ratio portion whose radiation ratio is made higher by surface treatment than a radiation ratio in a state prior to the surface treatment is formed on the second surface
Implementation Method 2
a reflector to direct radiant heat away from the robot
Implementation Method 3
a heat-receiving plate for receiving heat emitted from the release-side high radiation ratio portion
Data Source
AI summary
A transport robot including a release-side high radiation ratio portion and a receive-side high radiation ratio portion that face each other. Heat in a substrate conducted to a base portion due to thermal conduction is released as radiant heat from the release-side high radiation ratio portion, and the radiant heat is absorbed by the receive-side high radiation ratio portion. The receive-side high radiation ratio portion is formed on a heat-receiving plate that is thermally connected to a vacuum chamber so that radiant heat absorbed by the receive-side high radiation ratio portion is transferred to the vacuum chamber. As a result, even in the case where the high-temperature substrate is transported in a vacuum atmosphere, heat from the substrate is not accumulated in a transport system, and the transport system hardly reaches a high temperature.