Solenoid Valve Axial Filter Gap Prevents Dirt Jamming
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Solution Overview
Problem
Solenoid valves in hydraulic vehicle brake systems face jamming and clogging due to large dirt particles, which can lead to functional failures, especially in systems with high differential pressures and small preliminary stage openings.
Innovation Solution
A valve design incorporating an axial filter gap between the actuating element and the preliminary stage sleeve, combined with a radial inflow opening, effectively filters out large dirt particles before they reach the preliminary stage, preventing jamming and clogging by defining specific dimensions for contaminants to be filtered out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radial filter is used to retain large dirt particles, then the filter can prevent particles from passing into the primary circuit, but relatively large dirt particles can cause jamming or clogging of the preliminary stage which has a small stroke and a small throughflow opening
Solution Approach 1:
The patent introduces a filtering gap upstream of the preliminary stage that actively removes dirt particles before they can reach and clog the preliminary stage. This preliminary filtering action prevents the harmful effect of particle accumulation in the critical preliminary stage area, resolving the contradiction between maintaining reliability and preventing particle-related failures.
Solution Approach 2:
The filtering gap acts as an intermediary structure between the radial filter and the preliminary stage. It provides an additional filtering mechanism that specifically protects the preliminary stage from particles that might pass through the radial filter, thereby preventing jamming while maintaining the overall filtration function.
2Reliability
If a separate filter is added to filter the entire volumetric flow, then particles can be filtered out regularly, but the main stage volumetric flow is throttled impermissibly
Solution Approach 1:
Instead of filtering the entire volumetric flow through a separate filter component, the patent creates a localized filtering gap specifically at the preliminary stage inlet. This local filtering approach provides the necessary particle removal function while minimizing interference with the main stage flow path, thus maintaining productivity while achieving reliability.
Solution Approach 2:
The filtering function is integrated into the axial dimension of the preliminary stage sleeve rather than adding a separate radial filter component. The filtering gap is formed axially between the preliminary stage sleeve and the actuating element, utilizing the existing axial space to provide filtration without throttling the main flow path.
3Stress or pressure
If the preliminary stage has a small stroke and small throughflow opening to enable high pressure switching, then opening is possible even in high differential pressures, but relatively large dirt particles can cause jamming or clogging
Solution Approach 1:
The filtering gap provides preliminary particle removal before fluid enters the preliminary stage. This preliminary filtering action protects the small throughflow opening and short stroke components from particle jamming, enabling the preliminary stage to maintain its high pressure switching capability without vulnerability to particle-related failures.
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 ensures that contaminants are caught upstream and flushed out, preventing leakage and maintaining valve functionality across all operating states without the need for a separate filter, thus avoiding throttling of the main stage volumetric flow.
Implementation Method 1
an axial filter gap is configured between an actuating element and the preliminary stage sleeve... the at least one inflow opening and the axial filter gap overlap at least in regions and together configure a filter in the flow path
Implementation Method 2
The actuating element is configured as a magnet armature which, in the case of energization of a stationary magnet coil of the valve, is moved axially, in particular, in order to press the first closing body against the first valve seat
Data Source
AI summary
A valve for adjusting a fluid flow includes a valve cartridge with at least one first fluid opening, at least one second fluid opening, a preliminary stage with a first valve seat and a first closing element, and a main stage with a second valve seat and a second closing element. The first valve seat is at a first axial through-opening of the second closing element, which is at least partly in a preliminary stage sleeve. The first valve seat is within the preliminary stage sleeve, and a flow path from the at least one first fluid opening to the preliminary stage leads through at least one inflow opening, which is radially introduced in the preliminary stage sleeve. An axial filter gap formed between an actuation element and the preliminary stage sleeve overlaps the at least one inflow opening at least in some regions and together form a filter.