Hydraulic Fluid Filter with Anti-Emptying Flow Control

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Solution Overview

Problem

Existing hydraulic filters fail to effectively eliminate air bubbles and contaminants from hydraulic fluids, leading to cavitation, noise, and deterioration of hydraulic systems, particularly during transient conditions, and are difficult to maintain.

Innovation Solution

A filter for hydraulic fluids with hydraulic fluid interception means that act as an anti-emptying device to prevent or slow down fluid movement when static, combined with a filtering cartridge system featuring calibrated passages and a by-pass mechanism to manage fluid flow and reduce air incorporation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hydraulic filters are positioned along the return line to the tank, then they can protect working devices from contaminants, but air bubbles are incorporated into the hydraulic fluid during transient conditions

Engineering Contradiction:

Improveprotection from contaminantsVSAvoidair bubble incorporation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional filter orientation by positioning the outlet below the free surface of the hydraulic fluid in the tank, rather than above it. This inversion prevents air bubbles from being incorporated into the fluid during transient conditions, while still maintaining effective contaminant filtration along the return line.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces an air vent as an intermediary component that allows trapped air bubbles to escape from the filter housing. This mediator prevents air bubbles from being carried into the tank with the filtered fluid, thereby resolving the contradiction between effective filtration and air bubble prevention.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the outlet is positioned above the free surface of the hydraulic fluid, then filtered fluid can be emitted effectively, but foaming and bubbling occur

Engineering Contradiction:

Improvefiltered fluid emissionVSAvoidfoaming and bubbling

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional outlet positioning by placing it below the free surface of the hydraulic fluid in the tank. This inversion allows filtered fluid to be emitted effectively into the fluid column, preventing foaming and bubbling that occur when outlets are positioned above the free surface.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If filters are designed with complex structures to improve filtration, then contaminant removal is enhanced, but maintenance difficulty increases

Engineering Contradiction:

Improvecontaminant removalVSAvoidmaintenance difficulty

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The patent segments the filter into a modular cartridge design that can be easily removed and replaced. The filter cartridge is separated from the housing, allowing for simple maintenance without disassembling the entire filter assembly, thus maintaining effective filtration while reducing maintenance difficulty.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extracts the filtering element as a separate, removable cartridge that can be easily taken out for replacement. This extraction design allows complex filtration structures to be maintained effectively while simplifying the maintenance process, as the cartridge can be replaced without affecting the housing or other components.

Inventive Principle:

Principle #2Taking out (Extraction)

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 filter effectively reduces air bubbles and contaminants, improving system performance and longevity while being easy to maintain and install.

Implementation Method 1

a filtering cartridge (6) having a tubular body extending longitudinally along a predefined axial direction from a first head to a second head closed by a bottom, the tubular body comprising a continuous tubular layer of filtering material suitable for being crossed by a pressurised hydraulic fluid to perform a filtering action thereon

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 2

hydraulic fluid interception means provided to create resistance to the passage of hydraulic fluid in order to contrast, slow down and/or prevent the emptying of hydraulic fluid from said supply chamber towards said first chamber internal to the filtering cartridge

Methodology Applied

Scientific EffectFlow resistance: Pressure Drop

Data Source

PatentUS20260070005A1Filter for hydraulic fluids for hydraulic circuits

Publication Date: 2026.03.12 MP FILTRI

AI summary

A filter for hydraulic fluids for hydraulic circuits comprising a filter body inside which a filtering cartridge is housed, the filter body comprises at least one hydraulic fluid inlet in communication with a supply chamber located upstream of the filtering cartridge, wherein hydraulic fluid interception means is housed inside the filter body and provided to act as an anti-emptying device/valve to create resistance to the passage of hydraulic fluid in order to contrast, slow down and/or prevent the emptying of hydraulic fluid from the supply chamber when the hydraulic fluid is at rest.