Jet Pump Blow-by Gas Separator for Engine Oil Decantation
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Solution Overview
Problem
Internal combustion engines face inefficiencies in purifying blow-by gases due to low velocities under certain operating conditions, leading to inadequate separation of oil droplets, which results in increased toxic emissions and oil consumption.
Innovation Solution
A decantation system comprising a jet pump and a separator device, where the jet pump accelerates blow-by gases before they enter the separator, enhancing the separation efficiency by increasing gas velocity and incorporating a secondary passage and check valve to manage flow and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blow-by gases are introduced into the separator device at low velocity, then the separator device structure is simple, but the separation efficiency of oil droplets is insufficient
Solution Approach 1:
A jet pump is introduced as an intermediary device between the crankcase and the separator device. The jet pump uses a propellant gas flow to create a suction effect that accelerates the blow-by gases before they enter the separator device, thereby improving separation efficiency without complicating the separator device itself
Solution Approach 2:
The system uses pneumatic principles by introducing a propellant gas (such as fresh air or recirculated exhaust gas) through the jet pump to create a high-velocity flow that entrains and accelerates the blow-by gases, achieving the required flow velocity for effective separation
2Manufacturing precision
If the blow-by gases are accelerated to high velocity before entering the separator, then the separation efficiency improves, but the energy consumption increases
Solution Approach 1:
The jet pump design allows the propellant gas flow to self-accelerate through the nozzle, creating a suction effect that draws in and accelerates the blow-by gases without requiring additional mechanical energy input for the acceleration process itself
Solution Approach 2:
The system changes the velocity parameter of the blow-by gases by using the jet pump's nozzle to accelerate the propellant gas, which in turn accelerates the blow-by gases through entrainment, achieving high separation efficiency with controlled energy input
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 system significantly improves the separation efficiency of oil droplets, achieving optimal purification and reducing toxic emissions and oil consumption, as demonstrated by improved spectral efficiency curves at various flow rates and pressures.
Implementation Method 1
a jet pump positioned upstream of the separator device and designed to accelerate the flow of the blow-by gas before it enters said separator device
Implementation Method 2
separator device designed so as to trap oil droplets that are present in a flow of a blow-by gas
Data Source
AI summary
The invention relates to an oil decantation system (1) comprising: (i) a separator device (6) designed to trap the oil droplets (107) that are present in a flow of a blow-by gas (110); and (ii) a jet pump (5) positioned upstream of the separator device (6) and designed to accelerate and draw the flow of the blow-by gas (110) before it enters said separator device (6).