Refrigerant Muffler Flow Control Insert to Reduce Pressure Drop
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Solution Overview
Problem
Conventional refrigerant mufflers cause excessive pressure drops in refrigerant flow, leading to decreased system efficiency, increased power consumption, and compromised cooling capacity in vehicular air-conditioning systems.
Innovation Solution
A flow control insert is integrated into the muffler housing, featuring a tubular design with a smaller inner diameter than the expansion chamber, which delimits radial outward expansion of the refrigerant and provides acoustic wave communication through porous sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional refrigerant mufflers with expansion chambers are used to attenuate acoustic waves, then noise from the compressor is reduced, but excessive pressure drops occur in the refrigerant flow
Solution Approach 1:
The muffler is divided into multiple expansion chambers separated by flow control inserts. Each chamber is separated by a partition wall with a flow control insert, creating distinct segments that independently manage acoustic waves while maintaining refrigerant flow. This segmentation allows noise attenuation in each chamber without requiring a single large expansion chamber that would cause excessive pressure drop.
Solution Approach 2:
Flow control inserts act as intermediaries between the refrigerant flow and the expansion chambers. These inserts include flow control openings that regulate refrigerant flow between chambers, reducing turbulence and pressure drop while still allowing acoustic waves to propagate through the expansion chambers for attenuation.
2Object-affected harmful factors
If the expansion chamber is enlarged to improve acoustic wave reflection and attenuation, then noise reduction is enhanced, but the pressure drop increases due to rapid radial expansion and contraction
Solution Approach 1:
The single large expansion chamber is segmented into multiple smaller expansion chambers. Each chamber provides acoustic wave reflection and attenuation, but the smaller size of each individual chamber reduces the radial expansion ratio compared to a single large chamber, thereby minimizing pressure drop from rapid expansion and contraction.
Solution Approach 2:
The multiple expansion chambers are arranged in series along the refrigerant flow path, providing continuous noise attenuation throughout the muffler length. This distributed approach maintains acoustic wave attenuation effectiveness while allowing the refrigerant to adapt gradually to each chamber, reducing sudden pressure drops.
3Object-affected harmful factors
If recirculation zones are formed around the inlet and outlet to enhance acoustic wave interference, then noise attenuation is improved, but the axial length available for expansion is reduced, increasing pressure drop
Solution Approach 1:
The recirculation zones are created within each segmented chamber rather than in a single large chamber. The partition walls with flow control inserts create controlled recirculation patterns in each segment that generate acoustic wave interference, while the segmented structure prevents excessive axial compression that would increase pressure drop.
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 flow control insert significantly reduces pressure drops in the refrigerant flow while maintaining the acoustic wave attenuation capabilities of the muffler, thereby enhancing the efficiency and performance of the refrigeration system.
Implementation Method 1
At least a section of the insert circumferential wall disposed along the expansion chamber is porous to provide acoustic wave communication between the flow pathway and the housing inner circumferential surface
Implementation Method 2
The insert inner circumferential surface delimits radially outward expansion of the refrigerant when the refrigerant is passing through the flow pathway along the at least a portion of the expansion chamber
Implementation Method 3
acoustic waves of a specific range of frequencies are able to reflect at an outlet end of the expansion chamber to interfere with new acoustic waves entering the expansion chamber at the inlet end thereof, thereby attenuating acoustic waves
Data Source
AI summary
A flow control insert configured for installation into a muffler housing includes a tubular insert circumferential wall having an insert inner circumferential surface defining a flow pathway extending axially across at least a portion of an expansion chamber of the muffler housing. An inner diameter of the insert inner circumferential surface is less than an inner diameter of the at least a portion of the expansion chamber and the insert inner circumferential surface delimits radially outward expansion of the fluid when the fluid is passing through the flow pathway along the at least a portion of the expansion chamber. At least a section of the insert circumferential wall disposed along the expansion chamber is porous to provide acoustic wave communication between the flow pathway and a housing inner circumferential surface of the muffler housing along the at least a portion of the expansion chamber.