CO2 Refrigeration π-Type Silencer for Pressure Pulsation Reduction
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Solution Overview
Problem
Refrigeration systems using carbon dioxide as a refrigerant face increased pressure pulsation due to higher density and sound speed, which existing methods have not adequately addressed.
Innovation Solution
A π-type silencer design with a first and second silencing space and a communication path extending between them, allowing for reduced pressure pulsation and flexible configuration options, including the use of mesh members to prevent reflection waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon dioxide is employed as a refrigerant, then refrigeration system efficiency is improved, but pressure pulsation becomes larger
Solution Approach 1:
The silencer is divided into multiple silencing chambers (first silencing chamber, second silencing chamber, third silencing chamber) connected in series, with each chamber providing incremental pressure pulsation reduction. This segmentation allows the system to effectively dampen pressure pulsation while maintaining refrigeration efficiency with carbon dioxide refrigerant.
Solution Approach 2:
The refrigerant passage is nested within the silencer structure, with the passage running through the center of multiple concentric silencing chambers. This nested configuration maximizes the silencing effect within a compact volume while maintaining efficient heat exchange and refrigerant flow.
2Ease of manufacture
If conventional silencer design is used, then manufacturing is simpler, but pressure pulsation reduction is insufficient
Solution Approach 1:
The silencer is divided into multiple silencing chambers (first silencing chamber, second silencing chamber, third silencing chamber) connected in series, with each chamber providing incremental pressure pulsation reduction. This segmentation allows the system to effectively dampen pressure pulsation while maintaining refrigeration efficiency with carbon dioxide refrigerant.
Solution Approach 2:
The invention optimizes specific parameters including the cross-sectional area ratio between refrigerant passage and silencing chambers (0.1 to 0.3), the length-to-diameter ratio of silencing chambers (2 to 5), and the number of chambers (2 to 4) to achieve effective pressure pulsation reduction while maintaining manufacturability.
3Object-generated harmful factors
If π-type silencer with side-by-side chambers is used, then pressure pulsation is reduced, but device length increases
Solution Approach 1:
The invention transitions from a linear arrangement of silencing chambers to a three-dimensional nested configuration where chambers are arranged concentrically around a central refrigerant passage. This dimensional change reduces the overall length of the silencer while maintaining the pressure pulsation reduction effect through multiple chambers.
4Reliability
If refrigerant passage extends into silencing space, then oil collection is prevented, but manufacturing complexity increases
Solution Approach 1:
The refrigerant passage is nested within the silencer structure, with the passage running through the center of multiple concentric silencing chambers. This nested configuration maximizes the silencing effect within a compact volume while maintaining efficient heat exchange and refrigerant flow.
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 π-type silencer effectively reduces pressure pulsation and prevents refrigerating machine oil collection, enabling a more compact design and cost-effective manufacturing while maintaining efficient refrigeration operations.
Implementation Method 1
a communication path extending from the lower end of the first silencing space and through the outside of the first silencing space to the lower end of the second silencing space and communicating with the second silencing space
Implementation Method 2
the use of mesh members to prevent reflection waves
Data Source
Figure 1
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AI summary
It is an object of the present invention to sufficiently reduce the pressure pulsation in a refrigeration system that employs carbon dioxide or the like as a refrigerant. A refrigeration system (1) according to the present invention comprises a first refrigerant passage (204), a π-type silencer (20, 20a), and a second refrigerant passage (205). The π-type silencer has a first silencing space (201), a second silencing space (202), and a communication path (203, 203a). The first silencing space communicates with the first refrigerant passage. The second silencing space is disposed below the first silencing space. The communication path extends from the lower end of the first silencing space to the outside of the first silencing space and communicates with the second silencing space. The second refrigerant passage extends from the lower end of the second silencing space.