Electromagnetic Valve Cavitation Erosion Mitigation
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Solution Overview
Problem
Conventional electromagnetic valves for high-pressure fuel supply pumps suffer from cavitation-induced erosion due to the lack of space for cavitation bubbles to form and release, leading to damage of the moveable core and fixed core components.
Innovation Solution
A cylindrical void is created in the magnetic resistance increasing part to capture cavitation bubbles, with an axially penetrating path for bubble release and a spring-loaded cavity to store bubbles, minimizing erosion by preventing core collision and enhancing suction force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the inner periphery of the magnetic resistance increasing part and the outer periphery of the moveable core form a narrow gap, then the suction force is enhanced, but there is no space for cavitation bubbles to be released causing erosion of the moveable core and fixed core
Solution Approach 1:
The patent introduces a radial dimension for cavitation bubble release by forming a through-hole in the magnetic resistance increasing part. While the axial gap remains narrow for maintaining suction force, the through-hole provides a radial escape path for cavitation bubbles, allowing them to be discharged to the rear side of the moveable core without requiring increased axial spacing.
2Object-affected harmful factors
If a void is formed to capture cavitation bubbles, then erosion is reduced, but the structure becomes more complex
Solution Approach 1:
The magnetic resistance increasing part serves multiple functions: it maintains the magnetic circuit, provides the axial gap for suction force, and contains the radially extending through-hole for cavitation bubble discharge. By integrating the cavitation relief function into an existing component rather than adding a separate structure, the patent reduces overall device complexity while still providing effective erosion protection.
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 effectively reduces cavitation-induced erosion and maintains a simple structure without additional processes, thereby lowering costs and improving valve performance.
Implementation Method 1
an electromagnetic coil; a moveable core that is allowed to be displaced in the axial direction of the moveable core when the fixed core sucks the moveable core
Implementation Method 2
a magnetic resistance increasing part that is a cylindrical non-magnetic body formed of a member separate from a fixed core
Data Source
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AI summary
An electromagnetic valve configured to decay the cavitation occurring around a moving part of the electromagnetic valve and prevent the occurrence of erosion is provided. A configuration in which the cavitation bubbles generated around the moving part of the electromagnetic valve are captured and decayed and the occurrence of erosion is prevented is compatible with the low cost for the electromagnetic valve. The compatibility is achieved by the formation of a void large enough to capture the cavitation bubbles in the magnetic resistance increasing part.