Scroll Compressor Discharge Port Eccentric Alignment
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Solution Overview
Problem
Scroll compressors generate vibrations and noise across a wide frequency range due to resonance in multiple frequency bands, making it difficult to reduce noise effectively with a single noise reduction method.
Innovation Solution
The compressor design features an orbiting scroll linked to an eccentric shaft with a fixed scroll having a first refrigerant path that discharges refrigerant towards the central axis of a second refrigerant path, which has a larger volume, reducing resonance modes and noise by aligning the downstream open end of the first path with the central axis of the second path, and optionally forming the first path at an incline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cylindrical collar is fitted onto the discharge port to reduce vibration and noise, then noise in certain frequency bands is reduced, but noise in other frequency bands remains because vibrations have a wide frequency range with resonance in multiple frequency bands
Solution Approach 1:
The discharge port is divided into multiple segments or openings arranged in specific patterns, which breaks up the resonant frequencies and reduces noise across multiple frequency bands simultaneously
Solution Approach 2:
The discharge port is positioned eccentrically relative to the center of the fixed scroll, creating an asymmetric configuration that disrupts resonance patterns and reduces vibration-induced noise across various frequency ranges
2Productivity
If the discharge port is positioned eccentrically to improve compression ratio and performance, then compressor performance is improved, but noise and vibration are increased
Solution Approach 1:
The discharge port is segmented into multiple smaller openings distributed in specific patterns, which maintains the eccentric positioning for performance while reducing the noise-generating surface area and disrupting resonance
Solution Approach 2:
Different portions of the discharge port have different characteristics - the overall eccentric positioning maintains compression performance while local segmentation and specific geometric features reduce noise generation in critical areas
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 reduces noise in the discharge cavity by minimizing the number of resonance modes generated, improving the compressor's performance and reducing vibrations across various frequency bands.
Implementation Method 1
Vibrations/noise generated by the scroll compressor have a wide frequency range, and noise occurs due to resonance in a plurality of different frequency bands
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Provided is a compressor with reduced noise. This compressor is provided with an orbiting scroll (30) which is rotatably linked to an eccentric shaft portion of a main shaft (17), a fixed scroll (20) which forms a compression chamber (PR) which compresses the refrigerant by opposing the orbiting scroll and which, in the end plate (21), has an upstream discharge port (24) through which the compressed refrigerant passes and which communicates with the compression chamber (PR), and a discharge cavity (25) which communicates with the downstream side of the upstream discharge port (24) and has a larger volume than the upstream discharge port (24). The upstream discharge port (24) is provided with an open end (24B) on the upstream side and an open end (24A) on the downstream side. The upstream open end (24B) is eccentric relative to the central axis (C) of the fixed scroll (20) and the central axis (C2) of the discharge cavity (25) is in the area occupied by the downstream open end (24A).