Compressor Recirculation Valve Inlet Mounting for Thermal Management
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Solution Overview
Problem
Current compressor recirculation valves are limited in application temperature due to sealing and electronic component limitations, particularly in highly boosted engine applications, leading to thermal and noise issues.
Innovation Solution
The compressor recirculation valve is relocated from the compressor outlet to the inlet, with a thermal break and a low-thermal-conductivity inlet adapter, such as Nylon, to reduce heat transfer and noise by positioning it in a cooler location and dissipating pressure pulses more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the CRV is mounted on the compressor outlet, then the valve is close to the recirculation channel, but the thermal capability is limited due to high-temperature exposure
Solution Approach 1:
The CRV mounting location is shifted from the compressor outlet to the compressor inlet, representing a spatial dimension change. This relocates the valve from a high-temperature zone to a cooler zone, improving thermal capability while maintaining functional effectiveness through the recirculation passage design.
Solution Approach 2:
A thermal break is introduced between the compressor housing and the inlet adapter to reduce heat transfer. This intermediary element acts as a thermal barrier, protecting the CRV and surrounding components from high-temperature exposure while allowing the system to maintain its recirculation function.
2Object-affected harmful factors
If the CRV is mounted on the compressor outlet, then the valve is in position, but NVH noise increases due to pressure pulse travel through discharge channel
Solution Approach 1:
The CRV mounting location is shifted from the compressor outlet to the compressor inlet, representing a spatial dimension change. This relocates the valve from a high-temperature zone to a cooler zone, improving thermal capability while maintaining functional effectiveness through the recirculation passage design.
Solution Approach 2:
The pressure pulse generation point is extracted from the discharge channel and relocated to the inlet duct. By opening the CRV directly into the inlet duct, the harmful pressure pulses are dissipated in a lower-pressure environment, removing the noise-generating mechanism from the high-velocity discharge flow path.
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
This configuration enhances thermal capability, reduces noise, and allows for a broader operational range without the need for custom high-temperature valves, while maintaining existing CRV designs.
Implementation Method 1
the inlet adapter is made from a material of low thermal conductivity, for example plastic... the plastic material is a Nylon
Implementation Method 2
the compressor housing includes a coolant passage disposed between the diffuser and the inlet adapter
Data Source
AI summary
A compressor system includes a compressor housing including an inlet opening and a diffuser outlet, the compressor housing includes a first recirculation passage extending from the diffuser outlet to a mounting face of the compressor housing. The compressor housing defines a cavity that receives a compressor wheel. An inlet adapter is mounted to the mounting face of the compressor housing and the inlet adapter includes a second recirculation passage in communication with the first recirculation passage in the compressor housing and with a compressor air inlet passage of the inlet adapter. A recirculation valve is mounted to the inlet adapter and is disposed in communication with the second recirculation passage for providing a selective connection of the first recirculation passage to the compressor air inlet passage.