Pulsation cancellation
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Solution Overview
Problem
Refrigeration systems generate adverse levels of sound due to pulsations during compressor operations, and existing sound suppression methods are inadequate in effectively mitigating these pulsations across various frequencies and system geometries.
Innovation Solution
A pulsation-canceling conduit assembly with axially displaceable members and a screw mechanism is introduced, allowing for adjustable effective volumes in the conduit branches to reduce pulsation parameters by tuning the lengths of the conduit legs and branches, which are strategically placed along the refrigerant flowpath between the compressor and heat exchangers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed-volume damping devices are used, then simple structure is achieved, but adaptability to different pulsation frequencies and system geometries is poor
Solution Approach 1:
The patent applies the dynamics principle by making the damping chamber volume adjustable through a movable partition that can be positioned at different locations along the branch conduit. This allows the effective volume of the damping device to be dynamically changed to match different pulsation frequencies and system configurations, resolving the contradiction between fixed structure and adaptability requirements.
2Object-affected harmful factors
If tuned plugs are positioned in branch portions, then particular pressure pulsations are attenuated, but device complexity and installation complexity increase
Solution Approach 1:
The patent applies the universality principle by designing a multi-functional assembly that combines the pulsation damping function with a standardized conduit structure. The movable partition mechanism serves multiple purposes: it creates the damping chamber, provides volume adjustment capability, and allows tuning for different frequencies. This integrated design reduces overall device complexity compared to separate tuned plugs and damping chambers.
3Adaptability or versatility
If variable volume damping devices are introduced, then adaptability to different operating conditions is improved, but device complexity increases
Solution Approach 1:
The patent applies the segmentation principle by dividing the branch conduit into multiple sections using the movable partition. This segmentation allows the damping chamber volume to be adjusted in discrete steps by repositioning the partition, providing adaptability to different operating conditions while keeping the structural complexity manageable through modular design.
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 assembly effectively reduces pulsation parameters by adjusting the positions of the members to minimize sound generation, providing a flexible and adaptable solution for various operating conditions and refrigerant properties, thereby enhancing the acoustic performance of refrigeration systems.
Implementation Method 1
The first member is axially displaceable along the first branch via a screw mechanism. The screw mechanism includes an external actuator handle so that rotation of the handle in first and second rotational directions respectively decreases and increases the effective volume.
Implementation Method 2
A pulsation-canceling conduit assembly with axially displaceable members and a screw mechanism is introduced, allowing for adjustable effective volumes in the conduit branches to reduce pulsation parameters by tuning the lengths of the conduit legs and branches
Data Source
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AI summary
The disclosure involves a pulsation-canceling conduit assembly. The assembly has a first conduit leg. A second conduit leg extends from a junction with the first conduit leg. A first branch extends from the junction opposite the first conduit. A first member is axially displaceable along the first branch to define an effective volume of the first branch.