Injection Valve Cooling Device Air Bubble Management
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Solution Overview
Problem
Cooling devices for injection valves in vehicles, particularly those used in SCR and DPF systems, face reduced cooling performance due to air bubbles in the cooling water and inclination of the device, which affects the water surface level and cooling efficiency.
Innovation Solution
The cooling device incorporates a cylindrical partitioning unit with a communication passage that allows air bubbles to rise and prevents them from flowing back, maintaining a higher water surface level and enhancing cooling performance by restricting water flow through strategically positioned flanges and passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the cooling device is inclined with respect to the gravity direction to facilitate installation and water flow, then water flow efficiency is improved, but air bubbles enter the cooling water and remain in the upper-side portion of the annular space, reducing cooling performance
Solution Approach 1:
The annular space is divided into multiple compartments by partition walls, creating separate regions for water flow and air bubble accumulation. This segmentation prevents air bubbles from blocking the cooling water flow path while maintaining efficient water circulation through the inclined cooling device.
Solution Approach 2:
An air venting passage is introduced as an intermediary structure that provides a dedicated path for air bubbles to escape from the cooling water. This mediator component allows air to be removed without interfering with the primary water flow function, resolving the conflict between inclination-based flow efficiency and air bubble contamination.
2Adaptability or versatility
If the cooling device is inclined with respect to the gravity direction, then installation flexibility is improved, but the water surface level in the annular space changes depending on the position of connecting pipes, making it difficult to effectively cool the injection valve
Solution Approach 1:
The cooling water inlet and outlet pipes are positioned at the same vertical level (equipotential position) relative to the annular space. This equipotential arrangement ensures that the water surface level remains consistent regardless of the cooling device's inclination angle, maintaining reliable cooling effectiveness while preserving installation flexibility.
Solution Approach 2:
The partition walls are strategically positioned to create localized water retention zones that maintain consistent water surface levels in critical cooling regions. This local quality adjustment ensures adequate cooling water coverage at the injection valve regardless of overall device inclination.
3Productivity
If air bubbles are present in the cooling water supplied into the annular space, then the cooling water can still circulate, but the air bubbles remain in the upper-side portion and decrease cooling performance
Solution Approach 1:
An air venting passage is provided to extract air bubbles from the cooling water circulation system. This extraction mechanism removes the harmful air bubbles that would otherwise accumulate in the upper-side portion of the annular space and degrade cooling performance, while preserving the circulation function.
Solution Approach 2:
The air bubbles, which are normally harmful to cooling performance, are directed to a specific air venting passage where they are safely removed. By providing a controlled escape route, the system converts the harmful presence of air bubbles into a manageable feature, maintaining circulation while eliminating their negative impact.
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
This design maintains a consistent higher water surface level, even when the vehicle is inclined, thereby improving the cooling performance of the injection valve and maintaining effective operation of the SCR system components.
Implementation Method 1
Air bubbles may enter the cooling water, which is supplied into an annular space of the cooling device. In such a case, the air bubbles may remain in an upper-side portion of the annular space.
Data Source
AI summary
An injection valve is provided in a cooling device. An outer jacket is provided at an outside of the injection valve. A cylindrical partitioning unit divides an annular space into an outside passage on a side of the outer jacket and an inside passage on a side of the injection valve. A second pipe portion supplies cooling water into the annular space and a first pipe portion discharges the cooling water from the annular space. A first restricting portion is provided between the first pipe portion and the second pipe portion and it restricts a flow of the cooling water in the outside passage from a part on a side of the second pipe portion to a part on a side of the first pipe portion. A second restricting portion is provided at a position on a side of the first pipe portion opposite to an injection port. The second restricting portion restricts the flow of the cooling water between the outside and the inside passages. A communication passage is formed in the cylindrical partitioning unit at a position above the first restricting portion and it communicates the outside and the inside passages to each other.