Oil Pump Control Valve Layout Against Contaminant Intrusion
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Solution Overview
Problem
Electromagnetic valves in oil pumps can malfunction due to contamination from oil entering through a through hole, leading to instability in the valve mechanism.
Innovation Solution
The electromagnetic valve is designed with an aperture positioned higher than the through hole, connected via a circumvention passage to prevent direct contamination and ensure stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a through hole is provided in the valve container for oil supply, then oil can be supplied to the valve mechanism, but contaminants in the oil can intrude into the valve body causing malfunction
Solution Approach 1:
The oil supply path is segmented into two separate openings: a through hole for oil supply and an aperture for pressure equalization. This segmentation allows the oil supply function to be maintained while preventing contaminant intrusion into the valve body, as the aperture is positioned to avoid direct alignment with the through hole.
Solution Approach 2:
The circumvention passage acts as an intermediary path that connects the through hole and aperture while preventing direct communication. Oil can flow from the through hole to the aperture through this circumventing path, but contaminants are blocked from directly entering the valve body through the aperture.
2Use of energy by moving object
If the aperture is positioned to directly face the through hole, then pressure equalization is efficient, but contaminants can directly enter the valve body
Solution Approach 1:
The aperture is positioned asymmetrically relative to the through hole, specifically higher in the vertical direction and offset horizontally. This asymmetric positioning prevents direct alignment between the two openings, blocking the contaminant intrusion path while maintaining pressure equalization function through the circumvention passage.
Solution Approach 2:
The pressure equalization function is achieved not through direct vertical alignment (one dimension) but through a circumvention passage that routes oil flow through a different spatial path. This dimensional change in the flow path prevents contaminant intrusion while maintaining pressure equalization efficiency.
3Reliability
If the aperture is positioned higher than the through hole, then contaminant intrusion is prevented, but pressure equalization path is lengthened
Solution Approach 1:
The circumvention passage is designed with optimized local geometry to minimize flow resistance despite the increased path length. The passage is positioned and shaped to allow efficient oil flow from the through hole to the aperture, maintaining pressure equalization effectiveness while preventing contaminant intrusion through the higher aperture position.
Data Source
AI summary
An oil pump includes a pump component, a valve container, a valve mechanism, and a circumvention passage. The valve container includes a through hole establishing communication between an inside and an outside of the valve container. The valve mechanism includes: a valve body contained in the valve container; a valve element contained movably in the valve body; a back pressure chamber disposed to face a first valve end of the valve element; a drive mechanism disposed to face a second valve end of the valve element and structured to generate a drive force to move the valve element; and an aperture positioned higher in a vertical direction than the through hole and formed in the valve body so as to establish communication between the back pressure chamber and the inside of the valve container. The circumvention passage establishes communication between the through hole and the aperture.