Fluid Injector Director Plate Venturi Atomization
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Solution Overview
Problem
Existing fluid injectors, such as those used for injecting liquid urea or fuel into internal combustion engines, face limitations in achieving optimal atomization, which is crucial for efficient exhaust aftertreatment and combustion processes.
Innovation Solution
A fluid injector design featuring a director plate with specific aperture configurations and a fluid flow channel that decreases in cross-sectional area towards the first director plate aperture and increases towards the second, creating a venturi effect to aspirate atmosphere and enhance atomization, with the first director plate aperture being smaller than the second and having a greater slope than the fourth portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional director plate with apertures is used, then fluid atomization is improved, but the degree of atomization is insufficient for optimal combustion or exhaust aftertreatment
Solution Approach 1:
The patent changes the geometric parameters of the fluid flow channel by incorporating a venturi section with a narrowed throat area. This parameter change creates a pressure differential that aspirates atmosphere into the fluid stream, significantly improving atomization quality beyond what conventional director plates can achieve
Solution Approach 2:
The patent applies pneumatic principles by using the venturi effect to create a pressure differential that draws atmosphere into the fluid flow channel. This hydraulic/pneumatic interaction between the fluid stream and aspirated atmosphere enhances atomization through shear forces and turbulence
2Device complexity
If the fluid flow channel cross-sectional area is constant, then the structure is simple, but atomization is insufficient
Solution Approach 1:
The patent introduces variable cross-sectional area parameters along the fluid flow channel, with a narrowed throat section followed by an expanded section. This geometric parameter variation creates the venturi effect necessary for atmosphere aspiration and enhanced atomization, justifying the increased structural complexity
3Device complexity
If atmosphere is not aspirated into the fluid, then the device is simple, but combustion efficiency is reduced
Solution Approach 1:
The patent employs pneumatic principles through the venturi effect to automatically aspirate atmosphere into the fluid flow channel without mechanical moving parts. The pressure differential created by the narrowed throat section drives the atmosphere aspiration, achieving efficient combustion enhancement with minimal device complexity
Solution Approach 2:
The venturi section is designed to automatically aspirate atmosphere based on the fluid flow itself, without requiring external control mechanisms or additional energy input. The system self-regulates the atmosphere aspiration rate based on the fluid flow conditions
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 significantly improves fluid atomization by creating a venturi effect that aspirates atmosphere into the fluid flow channel, leading to a finer spray and more efficient combustion or exhaust treatment.
Implementation Method 1
a fluid flow channel formed between the valve seat and the director plate and extending from an inlet end to an outlet end such that the first director plate aperture and the second director plate aperture extend through the director plate from the fluid flow channel... wherein the fluid flow channel decreases in cross-sectional area in a direction from the inlet end toward the first director plate aperture
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A fluid injector (10) includes a fluid inlet (14); a valve seat (18) located downstream of the fluid inlet (14) and having a valve seat aperture (18c) extending therethrough; a valve member (20) moveable between a closed position and an open position to control flow through the valve seat aperture (18c); and director plate (24) including a first aperture (36) and a second aperture (34) extending therethrough. A fluid flow channel (38) is formed between the valve seat (18) and the director plate (24) and extends from an inlet end (40) to an outlet end (42). The first aperture (36) and the second aperture (34) extend through the director plate (24) from the fluid flow channel (38). The first aperture (36) is located between the inlet end (40) and the second aperture (34). The fluid flow channel (38) decreases in cross-sectional area from the inlet end (40) toward the first aperture (36) and the fluid flow channel (38) increases in cross-sectional area from the first aperture (36) toward the second aperture (34).