Pressure pulsation traps
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Solution Overview
Problem
HVAC systems with variable speed compressors face challenges in attenuating pressure pulsations and noise over a wide range of frequencies, as traditional mufflers are ineffective and adding multiple mufflers increases cost and weight, while also being susceptible to material compatibility issues and detachment due to differences in compressor materials.
Innovation Solution
A pressure pulsation trap with a channel and multiple branches of varying lengths, configured to attenuate noise and vibrations across a range of frequencies without requiring precise calculations of sound speed or wavelength, made from compatible materials like copper to ensure effective welding and reduced weight, allowing for flexible placement and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional mufflers are used to attenuate pressure pulsations, then noise reduction is achieved at specific frequencies, but effectiveness is lost across the wide frequency range produced by variable speed compressors
Solution Approach 1:
The muffler is segmented into multiple independent resonating chambers, each tuned to different frequencies. This segmentation allows the single muffler to handle multiple frequency ranges simultaneously, making it effective for variable speed compressors that operate across a broad spectrum of frequencies.
Solution Approach 2:
The invention changes the physical parameters of the muffler by incorporating chambers with varying volumes and configurations. By adjusting chamber volumes and geometries, the muffler can resonate at multiple frequencies, adapting to the variable operating conditions of the compressor without requiring multiple separate devices.
2Object-affected harmful factors
If multiple mufflers are added to cover wide frequency ranges, then noise attenuation improves across frequencies, but cost and weight increase
Solution Approach 1:
Multiple resonating chambers that would traditionally require separate mufflers are merged into a single integrated device. The chambers share common structural elements and mounting hardware, reducing overall weight and complexity while maintaining the ability to attenuate multiple frequency ranges simultaneously.
Solution Approach 2:
The single muffler is designed to perform multiple functions by incorporating chambers that target different frequency ranges. This multi-functional design eliminates the need for multiple specialized mufflers, reducing total system weight while providing comprehensive noise attenuation across the variable speed compressor's operating range.
3Object-affected harmful factors
If multiple mufflers are added to cover wide frequency ranges, then noise attenuation improves across frequencies, but device complexity increases
Solution Approach 1:
Multiple resonating chambers are merged into a single muffler housing with unified mounting and connection points. This consolidation reduces installation complexity and simplifies the overall system configuration while maintaining the multi-frequency attenuation capability that would otherwise require multiple separate devices.
4Ease of manufacture
If different materials are used for compressor and muffler, then manufacturing flexibility improves, but material compatibility issues and detachment occur
Solution Approach 1:
The muffler is constructed from the same material as the compressor (e.g., aluminum) to ensure homogeneous material properties throughout the assembly. This eliminates galvanic corrosion and welding incompatibility issues that arise from joining dissimilar materials, while still allowing for manufacturing flexibility through standard fabrication processes.
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 pressure pulsation trap effectively reduces noise and vibrations across a broad frequency range, providing greater flexibility and compatibility with variable speed compressors, reducing the need for multiple mufflers and minimizing material compatibility issues, while maintaining a lightweight and durable design.
Implementation Method 1
a plurality of branches extending from the channel, each of the branches having different lengths than one another, where the different lengths are configured such that the branches attenuate noise and/or vibration over a range of operating frequencies
Implementation Method 2
pressure pulsations can be estimated based on the equation, C=λ*f, where C is the speed of sound, λ is the acoustic wavelength, and f is the frequency. Using this equation, a refrigerant line muffler may be designed to induce destructive interference between entering and reflected waves within the refrigerant line muffler
Implementation Method 3
Another common strategy for reducing pressure pulsations is to pass the fluid through a typically porous media that reduces the amplitude of the pressure wave by absorbing at least some of the wave's energy
Data Source
AI summary
A pressure pulsation trap is provided. The pressure pulsation trap includes a channel extending from an inlet to an outlet, and a plurality of branches extending from the channel, each of the branches having different lengths than one another. The different lengths are configured such that the branches attenuate noise and/or vibration over a range of operating frequencies.