Scroll Compressor Suction Port Geometry for Lower Pressure Loss
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Solution Overview
Problem
The efficiency of scroll compressors is decreased due to increased pressure loss when fluid passes through a suction port that is not properly shaped.
Innovation Solution
The suction port is designed with an inlet portion where the cross-sectional area of the flow passage decreases from the upstream-side opening to a downstream-side opening, and the outlet portion has an inclined surface inwardly inclined in the radial direction, with the boundary part between the inlet and outlet portions closer to the second surface than the intermediate line in the axial direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional suction port is used, then the structure is simple, but pressure loss increases and compressor efficiency decreases
Solution Approach 1:
The suction port is designed with different cross-sectional areas at different locations: a first cross-sectional area at the upstream side and a second cross-sectional area at the downstream side, where the second area is larger than the first. This local variation in geometry optimizes fluid flow characteristics at different stages of the suction port, reducing pressure loss while maintaining manufacturing feasibility.
2Productivity
If the suction port cross-sectional area is increased uniformly, then pressure loss may decrease, but the boundary part position becomes critical and design complexity increases
Solution Approach 1:
The invention specifies that the boundary part between the inlet portion and outlet portion should be located closer to the second surface than to the intermediate line between the first and second surfaces. This parameter specification for the boundary part position optimizes the transition zone where cross-sectional area changes, improving refrigerant intake efficiency while providing clear manufacturing guidance.
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 reduces pressure loss and improves refrigerant intake efficiency by guiding fluid flow effectively into the compression chamber.
Implementation Method 1
a wall surface of the outlet portion, which is located on an inner side in a radial direction perpendicular to the axial direction, is an inclined surface that is inclined inwardly in the radial direction, in a direction from an upstream side toward a downstream side
Data Source
AI summary
In a scroll compressor, a suction port has an inlet portion in which a cross-sectional area of a flow passage therein decreases, and an outlet portion in which a cross-sectional area of the flow passage therein increases. A main frame has a first surface in which the upstream-side opening of the suction port is formed, and which is perpendicular to the rotation shaft, and a second surface opposite to the first surface. A boundary part between the inlet and outlet portions is closer to the second surface than an intermediate line between the first and second surfaces in an axial direction. A wall surface of the outlet portion that is located on an inner side in a radial direction perpendicular to the axial direction is an inclined surface that is inclined inwardly in the radial direction, in a direction from an upstream side toward a downstream side.