Injection Valve Cooling via Annular Compressed Air Cavity
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Solution Overview
Problem
Existing injection devices for internal combustion engines lack versatility and cost-effectiveness in injecting media into the exhaust system for particle filter regeneration, particularly in achieving efficient atomization and cooling of the injection valve.
Innovation Solution
A modular injection device with a valve holder and injection valve, featuring a concentric annular cavity for compressed air cooling and a pot-shaped cooling plate with multiple outlet openings, allowing for versatile use in fuel and reducing agent injection, and easy assembly through material-removing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a standard low-pressure petrol injection valve is used for cooling the injection valve, then the device complexity is reduced, but the atomization quality deteriorates
Solution Approach 1:
A separate cooling device with cooling channels is introduced as an intermediary component between the injection valve and the exhaust gas flow. This cooling device acts as a mediator that provides targeted cooling to the injection valve without requiring modification of the injection valve itself, thereby maintaining atomization quality while reducing device complexity
Solution Approach 2:
The injection system is segmented into distinct functional components: the injection valve for fuel delivery and a separate cooling device for thermal management. This segmentation allows each component to be optimized independently - the injection valve for atomization and the cooling device for thermal control - resolving the contradiction between simplicity and precision
2Reliability
If the valve holder is firmly connected to the exhaust pipe, then the reliability is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The connection between the valve holder and exhaust pipe is made adjustable rather than fixed. The fastening device allows for variable positioning and securement, enabling reliable installation while accommodating different exhaust pipe configurations and simplifying the manufacturing process through modular design
3Ease of manufacture
If the cavity is designed as an annular space, then the ease of manufacture is improved, but the cooling efficiency deteriorates
Solution Approach 1:
The cooling device incorporates localized cooling channels that concentrate cooling flow at critical hot spots around the injection valve. This local quality approach ensures efficient cooling in specific areas while maintaining the simple annular cavity structure for ease of manufacture
Solution Approach 2:
The cooling system transitions from a two-dimensional annular space to a three-dimensional cooling network with channels extending in multiple directions around the injection valve. This dimensional enhancement improves cooling efficiency while maintaining manufacturability through standard machining operations
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 modular design ensures efficient atomization and cooling of the injection valve, promoting better particle filter regeneration and compliance with emission standards, while simplifying manufacturing and maintenance.
Implementation Method 1
compressed air can be blown into an air gap between an outer wall and an inner wall of the valve-receiving body via a compressed-air generating device
Implementation Method 2
The application of compressed air causes a fine atomization of the medium and thus an optimization of the spray
Data Source
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AI summary
The invention relates to an injection device for injecting a medium, particularly for injecting fuel into the exhaust line (1) of an internal combustion engine, comprising an injection valve (2) and a valve holder (3), wherein the valve holder has a bore (4) to receive the injection valve (2) running through it and forms a cavity (5) enclosing the bore (4), said cavity being able to be charged with compressed air via a compressed air port (6) to support the injection process and to cool the injection valve (2). According to the invention, the cavity (5) takes the form of an annular chamber arranged concentrically to the bore (4), said chamber being delimited on the exhaust line side by a cooling baffle (7) with at least one compressed air outlet port (8), wherein the cooling baffle (7) is securely connected to the valve holder (3).