Device for damping pressure pulsations for a compressor of a caseous fluid
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Solution Overview
Problem
Conventional silencers for compressors in refrigerant circuits of motor vehicle air-conditioning systems are either ineffective in reducing noise due to inadequate noise insulation or require significant installation space, leading to increased manufacturing costs and complexity.
Innovation Solution
A device with a housing that encloses a chamber and features at least two pass-through openings, where insert elements are arranged inside the openings to reduce the cross-sectional area, thereby enhancing noise damping performance while minimizing space and material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional silencers are used to dampen pressure pulsations, then noise insulation is improved, but installation space requirements increase significantly
Solution Approach 1:
The insert element is nested within the existing connecting line structure. The insert element has a outer diameter that corresponds to the inner diameter of the connecting line, allowing it to be inserted and secured within the existing refrigerant circuit connecting line without requiring additional external space.
Solution Approach 2:
The invention transitions from external silencer configurations to an internal insert element configuration. By placing the damping structure inside the connecting line rather than outside, the solution utilizes the internal dimension of the existing structure to achieve noise insulation without increasing external installation space.
2Object-affected harmful factors
If conventional silencers with complex internal arrangements are used, then noise damping performance is improved, but manufacturing complexity and costs increase
Solution Approach 1:
The silencer function is segmented into a separate insert element that can be manufactured independently and then inserted into the connecting line. This separates the complex damping function from the connecting line structure, allowing each component to be optimized and manufactured separately for simplicity.
Solution Approach 2:
The insert element acts as an intermediary component that provides the noise damping function without requiring modification of the existing connecting line structure. It mediates between the refrigerant flow and the connecting line walls, achieving damping through its internal geometry while maintaining structural simplicity.
3Object-affected harmful factors
If reflective silencers with large housing volumes are used, then pressure pulsation damping is improved, but space requirements and manufacturing costs increase
Solution Approach 1:
The damping function is extracted from a large housing structure and concentrated into a compact insert element. By removing the need for a large external housing and placing the damping geometry directly inside the connecting line, the solution achieves pressure pulsation damping with minimal volume occupation.
Solution Approach 2:
The insert element utilizes the thin-walled structure of the connecting line as part of its damping mechanism. The insert element works in conjunction with the connecting line walls to create the necessary flow restrictions and expansion chambers, eliminating the need for thick-walled or voluminous housing structures.
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 device achieves improved noise damping performance over a broad frequency range with minimal pressure losses and reduced installation space requirements, enhancing the comfort of vehicle passengers by reducing noise emissions.
Implementation Method 1
As a result of the impedance jump generated with the sudden change from the smaller internal diameter of the refrigerant circuit connecting line to the large internal diameter of the housing, or the internal volume of the silencer, the sound waves that occur as pressure pulsations in the line are damped.
Implementation Method 2
The function of the device for damping the pressure pulsations lies in altering a flow cross-section, in particular a sudden change in flow cross-section, for the fluid compressed by the compressor. The sudden change in flow cross-section causes an increased pressure pulsation loss, which in turn reduces the pressure pulsations that are transmitted to the vehicle interior
Data Source
AI summary
A process for manufacturing a device and the device for damping pressure pulsations for a compressor of a gaseous fluid, in particular a refrigerant, in a refrigerant circuit of a motor vehicle air-conditioning system. The device exhibits a housing that encompasses a chamber and features at least two outlet openings. Here, the housing is constructed between tubular connecting lines, whose ends are aligned with one another. An insert element for reducing the cross-sectional area of the pass-through opening is arranged inside at least one of the pass-through openings.