Hydrogen Fuel Injector Sealing via Composite Valve Seat
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Solution Overview
Problem
Existing hydrogen injectors face challenges with long-term sealing due to wear between metal shutter and valve seat, leading to hydrogen leakage, and the use of elastic gaskets results in rapid wear and reduced injector lifespan.
Innovation Solution
A fuel injector design featuring a shutter with a progressively increasing and decreasing outer diameter, an elastomeric gasket for sealing, and an independent end-of-stroke system to manage the needle's movement, ensuring effective sealing and reducing stress on the gasket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gasket made of elastic material is used to cover the valve seat, then hermetical seal is ensured, but the gasket experiences rapid wear and the useful life of the injector is significantly limited
Solution Approach 1:
A copper layer is introduced as an intermediary between the shutter and the valve seat. The copper layer serves as a sacrificial element that absorbs wear instead of the elastomeric gasket, thereby protecting the gasket from direct contact wear and extending the injector's useful life while maintaining hermetical sealing capability
Solution Approach 2:
The valve seat is constructed as a composite structure combining copper and elastomeric materials. The copper layer provides wear resistance and structural support, while the elastomeric layer provides hermetical sealing. This composite approach allows each material to perform its optimal function without compromising the other
2Strength
If both the shutter and the valve seat are made of metal, then structural strength is maintained, but wear at the contact zone causes hydrogen leakage over time
Solution Approach 1:
The valve seat is constructed as a composite structure combining copper and elastomeric materials. The copper layer provides wear resistance and structural support, while the elastomeric layer provides hermetical sealing. This composite approach allows each material to perform its optimal function without compromising the other
Solution Approach 2:
The material composition of the valve seat is changed from purely metallic to a composite of copper and elastomer. This parameter change in material properties allows the valve seat to simultaneously provide structural strength through the copper layer and hermetical sealing through the elastomeric layer, preventing hydrogen leakage
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 design achieves a perfect long-term seal, extends the service life of the injector, and is simple and cost-effective to produce, with fewer complex components compared to traditional designs.
Implementation Method 1
the capability of the gasket to elastically deform so as to self-adapt to the shape of the shutter
Implementation Method 2
a closing spring which pushes the needle towards the closed position
Implementation Method 3
an electromagnetic actuator configured to move a movable unit provided with a needle
Data Source
AI summary
A fuel injector for a gaseous fuel and having: an injection nozzle; a support body with a tubular shape; an injection valve, configured to adjust the gaseous fuel flow through the injection nozzle and provided with a movable shutter arranged outside the support body and with a valve seat; an actuator, configured to move the shutter between a closed position of the injection valve and an open position of the injection valve; an elastomeric material gasket, which is arranged at the injection valve to obtain the valve seat; and an end-of-stroke system, which determines the closed position and is separate from and independent of the gasket.