Motion Guide Cooling Nozzles Using Coanda Effect
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Solution Overview
Problem
Existing motion guide apparatuses face challenges in cooling efficiency due to difficulties in processing coolant grooves and passages, and air-cooling offers a solution but with lower efficiency compared to liquid cooling.
Innovation Solution
The design of motion guide apparatus cooling nozzles that introduce gas into an inner passage, utilize a deflection surface to bend the gas flow, and a guiding surface to attract and amplify the gas flow, enhancing cooling efficiency through the Coanda effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid cooling is used with coolant grooves or passages, then cooling efficiency is improved, but manufacturing difficulty increases and sealing requirements arise
Solution Approach 1:
The invention extracts the cooling function from the guide rail and block structures by using external nozzles that spray coolant directly onto the surfaces. This eliminates the need for internal coolant grooves or passages, simplifying manufacturing while maintaining effective cooling.
Solution Approach 2:
The invention introduces coolant nozzles as an intermediary component between the coolant source and the guide rail/block. This mediator delivers cooling without requiring modifications to the guide rail or block structures, avoiding sealing issues and manufacturing complexity.
2Ease of manufacture
If air cooling is used instead of liquid cooling, then sealing requirements are eliminated, but cooling efficiency decreases
Solution Approach 1:
The invention uses pressurized gas flow from nozzles to deliver cooling. The pressurized gas creates a high-velocity jet that enhances convective heat transfer, achieving liquid-cooling-level efficiency without the complexity of liquid delivery systems or sealing requirements.
Solution Approach 2:
The invention changes the parameters of gas cooling by using pressurized gas instead of ambient air. The increased pressure and velocity of the gas flow significantly enhance the cooling capability, bridging the efficiency gap between air cooling and liquid cooling while maintaining the simplicity of gas-based cooling.
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
The amplified gas flow effectively cools the guide rail and block, improving the cooling efficiency of the motion guide apparatus even with gas cooling, addressing the limitations of air-cooling.
Implementation Method 1
the gas flow emitted from the opening of the cooling nozzle is bent along the deflection surface. When the gas flow is bent, a region of low pressure develops on the deflection surface due to the Coanda effect to attract the gas outside the cooling nozzle via the guiding surface
Implementation Method 2
The gas flow attracted via the guiding surface is entrained by the gas flow emitted from the opening. Accordingly, the gas flow emitted from the opening is amplified. The amplified gas flow cools the guide rail and/or the block
Data Source
AI summary
A motion guide apparatus cooling nozzle is provided which can gas-cool a motion guide apparatus. Cooling nozzles 1a and 1b of the present invention are mounted on a block 4 of the motion guide apparatus to cool at least one of a guide rail 2 and a block 4 that is assembled to the guide rail 2 via a rolling element 6 in such a manner as to be movable relatively. The cooling nozzles 1a and 1b include an inner passage 18 into which gas is introduced, an opening 12a configured to emit a gas flow introduced into the inner passage 18, a deflection surface 22a that is provided adjacently to the opening 12a to bend the gas flow emitted from the opening 12a, and a guiding surface 32a configured to attract gas outside the cooling nozzles 1a and 1b.