Common Rail Pressure Stabilization for Urea Spraying
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Solution Overview
Problem
The urea spraying system in high-power engines faces challenges in maintaining stable pressure due to long pipelines and significant pressure loss, necessitating a common rail that can effectively stabilize system pressure.
Innovation Solution
A common rail with a shell, pressure detection apparatus, and pressure adjustment apparatus, including inlet and outlet passages, conveyance and return flow ports, and a pressure control valve, which connects or disconnects these passages to adjust system pressure, reducing pressure loss and pipeline length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the pipeline of the urea spraying system is made long to cover high-power engine exhaust treatment, then the coverage area is improved, but the pressure loss increases significantly
Solution Approach 1:
The system is divided into multiple common rails distributed along the exhaust pipeline, with each rail serving a specific section. This segmentation allows the urea spraying function to be distributed rather than centralized, reducing the pressure loss in any single long pipeline while maintaining comprehensive coverage of the exhaust stream.
2Stress or pressure
If a cylindrical structure is adopted for the common rail to withstand high pressure, then the pressure resistance is improved, but the structural complexity and space requirements increase
Solution Approach 1:
The common rail incorporates a movable pressure adjustment apparatus that can dynamically connect or disconnect the inlet and outlet passages based on system pressure requirements. This dynamic mechanism allows the rail to adapt to varying pressure conditions without requiring an overly robust static structure, thereby reducing overall structural complexity while maintaining pressure resistance.
3Stability of the object's composition
If the pressure adjustment apparatus is added to stabilize system pressure, then the pressure stability is improved, but the device complexity increases
Solution Approach 1:
The pressure adjustment apparatus is designed to automatically regulate system pressure without requiring external control systems. The apparatus self-adjusts by connecting or disconnecting passages based on inherent pressure differential mechanisms, providing pressure stabilization while minimizing the need for additional control devices and reducing overall system complexity.
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 enables quick pressure buildup and stabilization, improving the efficiency and stability of the urea spraying system, reducing the length of return flow pipelines, and maintaining consistent pressure, thus enhancing exhaust treatment effectiveness.
Implementation Method 1
a pressure detection apparatus and a pressure adjustment apparatus installed on said shell; said pressure detection apparatus being connected to said inlet passage
Implementation Method 2
said pressure adjustment apparatus being connected between said inlet passage and said outlet passage, and said pressure adjustment apparatus being able to connect or disconnect said inlet passage and said outlet passage
Implementation Method 3
it is necessary to provide a common rail which can stabilize the system pressure
Data Source
AI summary
A common rail comprises a shell and a pressure detection apparatus and a pressure adjustment apparatus that are installed on the shell. The shell comprises an inlet passage, an outlet passage, at least one conveyance port that is connected to the inlet passage, and at least one flow return port that is connected to the outlet passage. The pressure detection apparatus is connected to the inlet passage. The pressure adjustment apparatus is connected between the inlet passage and the outlet passage. The pressure adjustment apparatus can connect or disconnect the inlet passage and the outlet passage. Also disclosed is a carbamide spraying system having such a common rail. Because a carbamide solution returned from a nozzle is first gathered inside the common rail and then returns to a carbamide tank through the outlet passage and a return flow pipe, the length of the return flow pipe is reduced. Further disclosed are an application of a common rail in a diesel engine exhaust processing system, a carbamide spraying system, and a control method for a carbamide spraying system.