Gas Compressor Outlet Geometry for Overcompression Relief
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Solution Overview
Problem
Existing gas compression elements experience issues with dynamic overcompression and efficiency loss due to incomplete evacuation of compressed gas, leading to potential damage and increased power consumption.
Innovation Solution
The outlet opening in the gas compression element is redesigned with a tongue-shaped protrusion that intentionally allows controlled leakage to reduce overcompression, featuring smaller tongue edge radii and adjusted edge positions to enhance gas evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outlet opening is designed with a conventional sealing line-based shape, then the compression chamber is properly sealed from the outlet, but dynamic overcompression occurs and compressed gas cannot be fully evacuated
Solution Approach 1:
The patent inverts the conventional approach by intentionally creating a controlled leakage path instead of complete sealing. The tongue-shaped protrusion is designed with specific edge geometries that allow controlled gas leakage from the compression chamber to the inlet region, preventing overcompression while maintaining effective sealing during the compression stroke. This inversion transforms the harmful effect of leakage into a beneficial control mechanism.
Solution Approach 2:
The outlet opening is designed with non-uniform local characteristics through the tongue-shaped protrusion with asymmetric edge configurations. The first and second edges have different geometries relative to the rotational axes, creating localized flow control zones. This allows different regions of the outlet opening to serve different functions: one region maintains sealing while another region facilitates controlled leakage for overcompression prevention.
2Reliability
If the outlet opening shape follows the sealing line trajectory, then high-pressure gas is separated from low-pressure gas, but the compression chamber area in fluid contact with the outlet is insufficient for proper evacuation
Solution Approach 1:
The patent extends the outlet opening geometry into the radial dimension by creating a tongue-shaped protrusion that extends radially from the compression chamber toward the inlet region. This three-dimensional configuration allows the outlet opening to maintain pressure separation functionality while providing sufficient surface area for gas evacuation. The tongue-shaped structure creates additional flow paths in the radial direction, increasing the effective contact area without compromising the sealing function.
3Power
If the outlet opening is positioned at the end face where lobes contact, then compressed gas can leave at desired pressure, but tongue-shaped protrusion creates restrictive portion that may cause leakage
Solution Approach 1:
The patent precisely controls the geometric parameters of the tongue-shaped protrusion, including the radii of the first and second edges relative to the rotational axes, and the positions of these edges along the compression chamber trajectory. By optimizing these parameters, the design achieves the right balance: the protrusion is positioned and sized to create sufficient restriction for pressure control while maintaining adequate opening area to prevent harmful leakage. The edge radii are specifically designed to match the lobe contact dynamics.
Data Source
Figure 1~2
Figure 3~4
AI summary
Element for compressing a gas, having a housing (2) in which a first and second rotor (3, 4) having respective rotational axes are mounted, wherein the housing (2) is provided with an axial outlet opening (8) formed, inter alia, by a tongue-shaped protrusion (14) between a first and second proximal edge (9b), wherein an edge of the tongue-shaped protrusion (14) is formed by at least a first and second tongue edge (13a, 13b), wherein the first or second tongue edge (13a, 13b) is further from the rotational axis of the first or second rotor (3, 4) than the second or first tongue edge (13a, 13b); wherein a first tongue edge radius of the first tongue edge (13a) relative to the first rotational axis is smaller than a parallel radius of a first geometric path relative to the first rotational axis, which path is described by a point of contact, situated furthest from the first rotational axis, between the end surfaces of a first and second lobe (5a, 5b).