Scroll Compressor Discharge Hole Noise Reduction
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Solution Overview
Problem
Conventional scroll compressors generate noise due to the movement of refrigerant through narrow discharge holes, which affects the operational efficiency and user experience.
Innovation Solution
The design incorporates discharge holes with an expanded flow channel and varying cross-sectional areas, which reduces noise by altering the sound wavelengths corresponding to specific frequencies, thereby minimizing noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If narrow discharge holes are used to connect the compression chamber to the outside, then the compressor structure is simple and compact, but noise is generated by refrigerant movement through the narrow holes
Solution Approach 1:
The discharge hole structure transitions from a simple linear passage to a three-dimensional expanded flow channel with varying cross-sectional areas. The channel expands in the middle section and tapers at the ends, creating a complex spatial geometry that reduces noise by altering refrigerant flow patterns and reducing turbulence-induced sound waves.
Solution Approach 2:
The cross-sectional area parameter of the discharge hole is varied along its length, with the middle section having a larger area than the end sections. This parameter change creates an expanded flow channel that reduces refrigerant velocity and turbulence, thereby reducing noise generation while maintaining effective refrigerant discharge.
2Object-generated harmful factors
If the discharge hole cross-sectional area is increased to reduce noise, then noise levels decrease, but the compressor size and complexity increase
Solution Approach 1:
The expanded flow channel is nested within the existing compressor structure, utilizing the space between the main frame and fixed scroll. The discharge hole expands inward into the available volume rather than outward, allowing noise reduction without significantly increasing the overall compressor footprint.
Solution Approach 2:
The discharge hole cross-sectional area is increased only in the middle section where noise generation is most problematic, while the end sections maintain smaller areas for efficient refrigerant discharge. This partial expansion provides noise reduction benefits without the full volume increase that would result from uniformly enlarging the entire discharge hole.
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 modified discharge hole structure effectively reduces noise levels, improving the usability and operational efficiency of the scroll compressor by mitigating vibrations and noise associated with refrigerant movement.
Implementation Method 1
reduces noise by altering the sound wavelengths corresponding to specific frequencies
Data Source
AI summary
Disclosed herein is a scroll compressor including a casing, a drive motor arranged in the casing, a shaft coupled to the drive motor, a main frame arranged under the drive motor, a fixed scroll arranged under the main frame, an orbiting scroll arranged between the main frame and the fixed scroll and engaged with the fixed scroll to form a compression chamber with the shaft eccentrically coupled to the orbiting scroll, a discharge cover coupled to the fixed scroll to form a closed space, a discharge port formed in the fixed scroll to connect the compression chamber and the closed space, and a discharge hole passing through the main frame and the fixed scroll, wherein an inlet and an inner portion of the discharge hole have different cross-sectional areas. The scroll compressor can reduce the noise caused by movement of the refrigerant by improving the structure of the discharge holes.