Nested Filter Assembly for Hydraulic Oil Air Bubble Separation
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Solution Overview
Problem
Existing filter devices struggle to effectively remove air bubbles from fluids, particularly hydraulic oil, which can lead to inefficiencies and potential damage in hydraulic systems.
Innovation Solution
A filter device comprising multiple filtration units, including a first filtration unit with a tubular filter element, a second filtration unit with a tubular filter element and a third filtration unit that covers flow paths to trap air bubbles, preventing their outflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a back pressure valve is used to prevent air outflow during idling, then air (initial air) inside the filter case is prevented from flowing out, but air bubbles contained in hydraulic oil flowing into the filter device after engine operation are difficult to remove
Solution Approach 1:
The filter device is divided into multiple filtration units (first, second, and third filtration units) with separate flow paths. The third filtration unit specifically targets air bubbles in the hydraulic oil flow path, separating the air removal function from the general filtration function. This segmentation allows each unit to specialize in its specific task, effectively removing air bubbles while maintaining the back pressure valve's air prevention capability during idling.
Solution Approach 2:
The third filtration unit acts as an intermediary component between the hydraulic oil flow path and the return flow path. It specifically captures and removes air bubbles from the hydraulic oil before the oil returns to the sump, preventing air bubbles from causing harm to the hydraulic system while allowing the back pressure valve to continue preventing initial air outflow during idling.
2Object-generated harmful factors
If multiple filtration units are added to remove air bubbles, then air bubble removal capability is improved, but device complexity increases
Solution Approach 1:
Multiple filtration units are merged into a single integrated filter device assembly that fits within the existing hydraulic system. The first, second, and third filtration units are arranged to work together in sequence, combining their functions into a unified system that removes air bubbles while maintaining compact dimensions and avoiding excessive complexity.
Solution Approach 2:
The filtration units are arranged in a nested configuration where the second filtration unit is positioned below the first filtration unit with overlapping plan views, and the third filtration unit is integrated into the flow path between them. This nesting allows the multiple filtration functions to occupy overlapping or adjacent spaces efficiently, reducing the overall device footprint and complexity.
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 prevents the outflow of air bubbles, simplifies the device structure, and ensures smooth operation of hydraulic systems by maintaining fluid quality.
Implementation Method 1
a third filtration unit provided in the first filtration unit or the second filtration unit... a filtration part that covers at least one of the first flow path, the second flow path, or the third flow path
Data Source
AI summary
A filter device includes: a first filtration unit; a second filtration unit provided below the first filtration unit to overlap the first filtration unit in plan view; and a third filtration unit provided in the first filtration unit or the second filtration unit. The first filtration unit includes: a case; a first inflow portion through which a fluid flows into the case; a first filter element having a tubular shape and disposed inside the case; and a first outflow portion including a first flow path through which the filtered fluid filtered by the first filter element flows out from the first filtration unit.