Turbine-Driven Crankcase Ventilation Pump with Separator
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Solution Overview
Problem
Internal combustion engines generate blowby gas, which is typically contained in the crankcase, and existing ventilation systems struggle to efficiently manage crankcase pressure and reintroduce the crankcase fluid back into the engine without adverse effects on components like compressors and turbines.
Innovation Solution
A crankcase ventilation system with a pump driven by a turbine shaft, a separator to remove lubricants, a regulator to manage pressure, and a check valve to prevent reverse flow, allowing crankcase fluid to be directed either back into the intake circuit or away through the exhaust circuit, depending on the system configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed crankcase ventilation system is used to reintroduce crankcase fluid into the engine, then crankcase pressure is regulated and blowby gas is reused, but lubricant contamination of engine components occurs
Solution Approach 1:
The separator extracts and removes lubricant from the crankcase fluid before it is reintroduced into the engine through the intake circuit. This extraction process prevents lubricant contamination of engine components while maintaining the benefits of the closed ventilation system.
Solution Approach 2:
The separator acts as an intermediary component between the crankcase ventilation circuit and the intake circuit. It mediates the flow of crankcase fluid by removing harmful lubricant contaminants before the fluid enters the intake system, thus protecting the compressor and other engine components.
2Object-affected harmful factors
If crankcase fluid is vented through the exhaust circuit, then lubricant contamination of the compressor is avoided, but system complexity increases
Solution Approach 1:
The crankcase ventilation system is designed with multi-functionality, allowing the crankcase fluid to be directed to either the intake circuit or the exhaust circuit based on operating conditions. This universal approach enables the system to avoid compressor contamination while maintaining flexibility in fluid management.
3Use of energy by moving object
If a pump is driven by turbine shaft to propel crankcase fluid, then energy efficiency is improved, but reliability decreases due to potential reverse flow
Solution Approach 1:
The check valve acts as a one-way intermediary that allows crankcase fluid to flow in the desired direction while blocking reverse flow. This protects the turbine-driven pump from damage and ensures reliable operation by preventing fluid from flowing backward into the pump.
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 effectively regulates crankcase pressure, prevents lubricant contamination of engine components, and ensures efficient circulation of blowby gases, enhancing engine performance and durability by avoiding adverse effects on the compressor and turbine.
Implementation Method 1
a turbine disposed in the exhaust circuit and having a turbine shaft configured to be driven by the exhaust fluid
Implementation Method 2
a pump disposed in the crankcase ventilation circuit and having a rotor configured to be driven by the turbine shaft to propel the crankcase fluid through the crankcase ventilation circuit
Data Source
AI summary
An internal combustion engine includes a block containing a crankshaft and a crankcase surrounding the crankshaft, a plurality of combustion chambers configured to receive an intake fluid and generate exhaust fluid, an exhaust circuit configured to direct the exhaust fluid away from the plurality of combustion chambers, an intake circuit configured to supply the intake fluid to the plurality of combustion chambers, a turbine disposed in the exhaust circuit and having a turbine shaft configured to be driven by the exhaust fluid, a crankcase ventilation circuit configured to direct crankcase fluid away from the crankcase, and a pump disposed in the crankcase ventilation circuit and having a rotor configured to be driven by the turbine shaft to propel the crankcase fluid through the crankcase ventilation circuit.