Injector Holder Component for Urea Fluid Injection
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Solution Overview
Problem
Injection devices for exhaust-gas treatment face issues with fluid deposits and temperature fluctuations, which can lead to damage due to the formation of deposits and expansion of fluids like urea-water solutions, causing pressure and freezing problems.
Innovation Solution
An injection device with a rigid component extending into the supply opening, which is partially compressible in the radial direction, combined with a rubber sheathing and perforations, to accelerate fluid flow, prevent deposits, and compensate for fluid expansion during freezing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid component is used in the supply opening to accelerate fluid flow, then deposit formation is prevented, but the device cannot accommodate fluid expansion during freezing
Solution Approach 1:
The component in the supply opening is designed with dynamic properties - rigid in the longitudinal direction to accelerate fluid flow and prevent deposits, but compressible in the radial direction to accommodate fluid expansion during freezing. This dynamic design allows the same component to adapt its mechanical properties based on the direction of stress.
Solution Approach 2:
The component exhibits different mechanical properties in different directions: rigid along the longitudinal axis for flow acceleration, but compressible in the radial direction for expansion accommodation. This local differentiation of mechanical properties resolves the contradiction between preventing deposits and tolerating temperature fluctuations.
2Device complexity
If the flow path has structurally induced diversions and widenings, then the injector structure is simplified, but deposit formation is promoted due to fluid slowing and swirling
Solution Approach 1:
The component in the supply opening is designed to pre-accelerate the fluid flow before it enters the injector. This preliminary action of accelerating the fluid prevents the fluid from slowing down and swirling in subsequent flow path diversions and widenings, thereby preventing deposit formation even when the overall injector structure remains simple.
3Strength
If the fluid is allowed to freeze and expand, then the rigid injector structure may be damaged, but preventing freezing requires complex heating systems
Solution Approach 1:
The compressible component in the supply opening acts as a beforehand cushioning element that can accommodate fluid expansion if freezing occurs. This pre-designed compression capability protects the rigid injector structure from damage without requiring complex active heating systems to prevent freezing.
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 solution effectively prevents deposit formation, reduces pressure fluctuations, and ensures the injection device's integrity by accelerating fluid flow and accommodating expansion, thereby enhancing dosing accuracy and preventing damage from freezing.
Implementation Method 1
Through the use of the component which extends into the supply opening of the injector, it is firstly possible for the flow of the fluid into the injector to be accelerated.
Implementation Method 2
the fluid can also freeze at low temperatures, and then cause damage and/or block the injector due to the expansion in volume
Implementation Method 3
the component is (substantially) rigid in a longitudinal direction oriented parallel to the supply opening and is at least partially compressible in a radial direction with respect to the longitudinal direction
Implementation Method 4
Furthermore, the flow path or the flow into the injector can be homogenized. Through the use of the component, it is also possible for regions that would (otherwise) be traversed less (effectively) by flow to be subjected to a better flow or better purging, in such a way that deposits are more effectively avoided in those areas.
Data Source
AI summary
An injection device for injecting a fluid into an exhaust-gas treatment device includes an injector positioned in an injector holder. The injector has a supply opening and a component of the injector holder extends into the supply opening. The injection device is suitable, in particular, for supplying a urea/water solution into an exhaust-gas treatment device of a motor vehicle. The component is preferably rigid in the longitudinal direction and can be compressed in the radial direction by way of a deformable rubber shell, in order to compensate for the volumetric expansion of the solution if it freezes. A motor vehicle having the injection device is also provided.