Multi-Stage Suction Jet Pump Bypass Valve
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-stage ejector pumps for internal combustion engines suffer from inefficiency and pressure loss when the engine operates in non-supercharged mode, as they rely on a propulsion jet to function effectively, leading to undesirable pressure losses if no propulsion jet is present.
Innovation Solution
Incorporating a bypass valve and/or check valve in the system to allow blow-by gas to bypass the ejector pump when it's not operating in supercharged mode, minimizing pressure loss and ensuring continuous functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-stage ejector pump is used to improve pump efficiency and reduce wear, then the pump can operate without moving parts and provide wear-free operation, but it generates significant pressure loss when no propulsion jet is available
Solution Approach 1:
The system dynamically switches between two operational modes: using the ejector pump during supercharged operation and bypassing it during non-supercharged operation. This dynamic configuration allows the system to adapt to different operating conditions, eliminating pressure loss when the propulsion jet is unavailable while maintaining wear-free operation benefits.
Solution Approach 2:
The system changes its flow path parameters based on operating conditions. During supercharged operation, the flow path includes the ejector pump with propulsion jet. During non-supercharged operation, the flow path switches to bypass the ejector pump entirely, changing the system parameters to avoid pressure loss.
2Productivity
If a multi-stage ejector pump is used to increase pumped volume flow, then the volume flow increases by a factor of 2 or 3, but the pump creates a sharply adjusted configuration that is not suitable for non-supercharged operation
Solution Approach 1:
The system achieves multi-functionality by incorporating both the ejector pump path and a bypass path. This universal design allows the system to handle both supercharged and non-supercharged operating modes effectively, making the ventilation system adaptable to different engine operating conditions.
Solution Approach 2:
The system dynamically reconfigures its flow path based on engine operating mode. During supercharged operation, it utilizes the multi-stage ejector pump to achieve high volume flow. During non-supercharged operation, it dynamically switches to the bypass path, ensuring continuous adaptability to varying operational requirements.
3Loss of energy
If a bypass valve is added to allow gas to bypass the pump when no propulsion jet is available, then pressure loss is minimized, but the device complexity increases
Solution Approach 1:
The bypass valve acts as an intermediary component that mediates between the crankcase and the intake section, providing an alternative flow path when the ejector pump is not operational. This intermediary element enables the system to minimize pressure loss without requiring complex control mechanisms.
Solution Approach 2:
The bypass functionality is extracted as a separate, independent path from the main ejector pump system. This extraction allows the bypass valve to operate independently, simplifying the overall control logic while effectively minimizing pressure loss during non-supercharged operation.
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 the pump's efficiency by reducing pressure loss and maintaining effective blow-by gas recirculation across all engine operation modes, optimizing the performance of the multi-stage ejector pump.
Implementation Method 1
The multi-stage pump 7 works by forcing a driving jet (e.g. compressed air from the supercharged suction pipe) through a small nozzle and the jet entraining gas at its periphery
Implementation Method 2
the jet entraining gas at its periphery. After the first stage, the volumetric flow, which is increased by the supply air, then flows through a second, larger and a third, even larger nozzle
Data Source
Figure 1~2
AI summary
The present invention relates to a multi-stage suction jet pump for extracting blow-by gases from internal combustion engines.