Injection Valve Assembly with Integrated Cavity Filtration
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Solution Overview
Problem
Existing injection valves for internal combustion engines face challenges in manufacturing simplicity and reliability, particularly under high pressures, where particle contamination can damage valve components and require additional filtration, complicating the manufacturing process.
Innovation Solution
A valve assembly with a first and second valve body, a filter positioned upstream of the fluid flow between them, and a spring to exert force on the valve needle, ensuring precise operation and eliminating the need for additional filters by trapping particles within the filter upstream of the fluid outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional filters are installed in the flow line to prevent particle damage, then reliability is improved, but device complexity increases
Solution Approach 1:
The invention extracts the filtration function from the main flow line and relocates it to a separate cavity (first cavity) that is hydraulically connected to the main flow path through a restricted passage. This allows particles to be trapped in the separate cavity while maintaining the simplicity of the main flow line without requiring multiple filters in sequence.
Solution Approach 2:
The invention introduces a restricted passage as an intermediary element between the first cavity containing the filter and the second cavity in the main flow line. This intermediary allows controlled fluid flow while preventing particles from reaching the critical outlet region, thereby protecting components without adding complex filtration systems to the main path.
2Reliability
If a filter is positioned close to the fluid outlet to protect valve components, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention segments the valve body into separate cavities: a first cavity for housing the filter and a second cavity for the main flow path. This segmentation allows the filter to be positioned in a dedicated space with appropriate clearance, eliminating the need for high-precision positioning relative to the outlet while still providing effective particle protection.
Solution Approach 2:
The restricted passage acts as an intermediary that decouples the filter position from the outlet position. Particles are trapped in the first cavity and cannot pass through the restricted passage to reach the second cavity and outlet, thereby protecting components without requiring the filter to be positioned immediately adjacent to the outlet with high precision.
3Ease of manufacture
If the valve assembly is simplified for easier manufacture, then ease of manufacture is improved, but particle protection capability deteriorates
Solution Approach 1:
The invention merges the filtration function with the valve body structure by integrating the filter into the first cavity that is formed as part of the valve body. This combination allows particle protection to be achieved without adding separate, complex filtration components, thereby maintaining ease of manufacture while providing effective particle protection.
Solution Approach 2:
The valve body itself provides the filtration function through the integrated first cavity and filter arrangement. The structure serves dual purposes: maintaining fluid flow through the restricted passage while simultaneously trapping particles, allowing the valve assembly to protect itself without requiring additional external filtration systems.
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 enhances manufacturing simplicity, prevents particle-induced damage to valve components, and allows for reliable operation under high pressures without additional filtration, reducing manufacturing complexity and costs.
Implementation Method 1
A filter is arranged directly upstream or inside the passage and is designed to filter fluid flowing from the first cavity to the second cavity
Implementation Method 2
a spring is arranged and designed to exert a force on the valve needle in axial direction
Data Source
Figure 1
Figure 2
AI summary
Valve assembly (14) of an injection valve (10) and injection valve (10), the valve assembly (14) comprising a first valve body (20) including a central longitudinal axis (A) and comprising a first cavity (24), a second valve body (21) being rigidly coupled to the first valve body (20) and comprising a second cavity (25) with a fluid outlet portion (28), and - a valve needle (22) axially movable in the first cavity (24) and the second cavity (25), the valve needle (22) preventing a fluid flow through the fluid outlet portion (28) of the second cavity (25) in a closing position and releasing the fluid flow through the fluid outlet portion (28) in further positions, the second valve body (21) comprising a passage (40) being arranged between the first cavity (24) and the second cavity (25) directly upstream the second cavity (25) and being designed to enable a fluid flow from the first cavity (24) to the second cavity (25). A filter (42) is arranged directly upstream or inside the passage (40) and is designed to filter fluid flowing from the first cavity (24) to the second cavity (25).