Packaged Compressor Fan Layout for Uniform Motor Cooling
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Solution Overview
Problem
The existing packaged compressor's cooling fan configuration results in uneven cooling air flow rates, with increased flow along the upper portion but decreased flow along the lower portion of the electric motor, leading to suboptimal electric-motor coolability.
Innovation Solution
A cooling fan with a larger diameter than the electric motor, arranged such that its axial-direction projection plane overlaps, is positioned above and below the electric motor, ensuring balanced air flow and enhanced coolability, while also reducing noise through lower rotation speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cooling fan is positioned to overlap only the upper portion of the electric motor, then the upper portion air flow increases, but the overall cooling efficiency decreases
Solution Approach 1:
The cooling fan is configured with extended diameter to provide differentiated cooling coverage: the upper portion receives cooling air from the fan's upper extension, while the lower portion receives cooling air from the fan's lower extension. This local quality adjustment ensures uniform temperature distribution across the entire motor surface, improving overall cooling 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 configuration enhances electric-motor coolability by increasing air flow rates on both upper and lower portions, reducing temperature variations, and improving the cooling efficiency of associated components like oil and aftercoolers.
Implementation Method 1
a cooling fan that is arranged on a side of the electric motor such that an axial direction of the cooling fan lies in a horizontal direction and crosses the axial direction of the electric motor, the cooling fan inducing a flow of cooling air that flows in from an outside of the housing via the cooling air inlet, thereafter flows around the electric motor, and thereafter flows out to the outside of the housing via the cooling air outlet
Data Source
AI summary
A packaged compressor with enhanced electric motor coolability includes an electric motor having an axial direction that lies in a horizontal direction; a compressor body; a housing that houses the electric motor and the compressor body; a cooling air inlet formed through a side surface of the housing; a cooling air outlet formed through an upper surface of the housing; and a cooling fan arranged on a side of the electric motor such that an axial direction of the cooling fan lies in a horizontal direction and crosses the axial direction of the electric motor. The cooling fan has a diameter greater than the height dimension of the electric motor and it's its axial-direction projection plane includes a portion overlapping the electric motor, a portion positioned above the electric motor and not overlapping the electric motor, and a portion positioned below the electric motor and not overlapping the electric motor.