Radial Compressor Bypass Valve for Turbocharger Pressure Loss
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Solution Overview
Problem
The existing compressor bypass valves in two-stage turbochargers face issues with nonlinear bypass flow rate regulation, significant pressure drop, poor transient response, and unsteady state operation due to the spring's dual functions and parallel movement with respect to pressure gradients, leading to design limitations and high manufacturing costs.
Innovation Solution
A rotating guillotine-style valve flap with a radially movable design perpendicular to the pressure gradient, actuated by a pneumatically or electrically controlled actuator, and featuring an umbrella valve for self-actuating safety, made from plastics to reduce weight and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is used to maintain contact between the valve member and valve seat, then tightness is improved, but the closing response time becomes dependent on pressure differences and spring design becomes complex
Solution Approach 1:
The invention extracts the spring from the valve actuation mechanism entirely. The valve member is directly actuated by pressure differential across the valve seat, with no spring involved. This eliminates the complexity of spring design and removes pressure dependency from closing response time, while maintaining tightness through the direct pressure-driven sealing mechanism.
Solution Approach 2:
The invention replaces the mechanical spring system with a direct pressure-driven mechanism. The valve member is moved by the pressure differential between the compressor inlet and outlet, substituting the elastic mechanical system (spring) with a fluid pressure system that provides both actuation and sealing forces.
2Reliability
If the valve member moves parallel to the pressure gradient, then sealing is achieved, but pressure drop and flow loss increase significantly
Solution Approach 1:
The invention inverts the traditional valve geometry. Instead of a valve member moving parallel to the pressure gradient (poppet valve), the valve member moves perpendicular to the pressure gradient, like a guillotine blade cutting across the flow. This allows the valve to seal effectively while minimizing flow disturbance and pressure loss when open.
Solution Approach 2:
The invention changes the dimension of valve movement from axial (parallel to pressure gradient) to radial (perpendicular to pressure gradient). The valve member rotates about an axis perpendicular to the pressure gradient direction, creating a sealing surface that is circumferential rather than axial, thereby reducing flow resistance when open.
3Reliability
If a metal valve is used, then durability is improved, but manufacturing cost and weight increase
Solution Approach 1:
The invention changes the material parameter from metal to plastic (specifically PTFE or similar fluoropolymer). This material substitution maintains durability through chemical inertness and wear resistance while significantly reducing manufacturing cost and weight. The plastic valve member is compatible with the pressure-driven actuation mechanism and provides adequate sealing performance.
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 design enhances response time, reduces pressure loss, and improves tightness and durability by minimizing pressure-dependent effort and impact stresses, while allowing for easier regulation and cost-effective production.
Implementation Method 1
valve flap which is radially movable with respect to said outlet between an opened position and a closed position... Movement of the valve flap is perpendicular to pressure gradients
Implementation Method 2
When the pressure difference is reversed, the safety function is achieved thanks to a dedicated device, i.e., an umbrella valve carried by the flap and is self-actuating
Data Source
Figure 1
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Figure 5
AI summary
The invention relates to a compressor bypass valve (1) for use in a multi-stage turbocharger of an internal combustion engine, said valve (1) comprising a valve body (30) comprising a compressor bypass passage (33, 42) having an inlet (33) and an outlet (42), and means for opening and closing said bypass passage (33, 42) comprising a valve flap (10). According to the invention, said valve flap (10) is radially movable with respect to said outlet (42) between an opened position and a closed position