Standpipe Recirculation for Swarf Separation Without Filters

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Solution Overview

Problem

Conventional recirculation systems for material removal machines require burdensome cleaning and replacement of filters and filtration media, which are also expensive.

Innovation Solution

The use of a standpipe to separate swarf and particulate material from recirculated fluid, eliminating the need for conventional filters and filtration media by allowing entrained material to settle before flowing into a lower reservoir.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional filters and filtration media are used to separate swarf from recirculated fluid, then material separation is achieved, but cleaning and replacement becomes burdensome and expensive

Engineering Contradiction:
Improvematerial separationVSAvoidcleaning and replacement
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent extracts the filtration function from conventional filters and filtration media by implementing a standpipe-based separation system. The standpipe allows swarf and particulate material to settle and separate from recirculated fluid through gravity, eliminating the need for traditional filters that require cleaning and replacement. This extraction of the filtration function resolves the contradiction by maintaining effective material separation while removing the maintenance burden associated with conventional filters.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The standpipe system enables self-service separation where the recirculated fluid automatically settles and separates swarf material without requiring external intervention for filter cleaning or replacement. The system uses the natural properties of the fluid and settled material to maintain separation, with the standpipe structure allowing continuous operation without manual maintenance of filtration components.

Inventive Principle:
Principle #25Self-service

2Reliability

If conventional filters and filtration media are used to separate swarf from recirculated fluid, then material separation is achieved, but operational costs increase due to expensive filter replacement

Engineering Contradiction:
Improvematerial separationVSAvoidfilter replacement cost
Core Design Contradiction:
ReliabilityVSLoss of substance

Solution Approach 1:

The patent replaces expensive, consumable filtration media with a durable, reusable standpipe structure. The standpipe is a permanent installation that does not require periodic replacement like conventional filters. This substitution of a cheap, long-lasting structural component for expensive, short-lived filtration media resolves the contradiction by maintaining effective material separation while dramatically reducing operational costs associated with filter replacement.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

3Ease of operation

If a standpipe is used to separate swarf from recirculated fluid, then filter replacement costs are eliminated, but the system requires sufficient fluid accumulation height to function

Engineering Contradiction:
Improvefilter maintenanceVSAvoidfluid accumulation requirement
Core Design Contradiction:
Ease of operationVSUse of energy by moving object

Solution Approach 1:

The standpipe system utilizes gravitational potential energy and equipotential principles to achieve separation. By allowing fluid to accumulate to a height that creates sufficient hydrostatic pressure, the system enables swarf material to settle and separate without requiring additional energy input. The standpipe structure creates a natural separation zone where the weight of the accumulated fluid provides the necessary force for material separation, resolving the contradiction by using passive gravitational forces rather than active energy consumption.

Inventive Principle:
Principle #12Equipotentiality

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

Facilitates easier cleaning and reduces costs by eliminating the need for filters and filtration media while effectively separating swarf and debris from recirculated fluid.

Implementation Method 1

the first reservoir is configured to permit settlement of material entrained in the fluid prior to the fluid exceeding the first height

Methodology Applied
Scientific EffectSedimentation: Sedimentation

Implementation Method 2

the standpipe blocks fluid from entering a drain in an upper reservoir that leads to a lower reservoir

Methodology Applied
Scientific EffectHydraulic barrier: Hydraulic Jump

Data Source

PatentUS12403539B2Standpipe recirculation systems for material removal machines
Publication Date: 2025.09.02 ILLINOIS TOOL WORKS INC
  • US12403539B2 patent drawing
  • US12403539B2 patent drawing
  • US12403539B2 patent drawing

AI summary

Provided are a recirculation system (200) for a material removal machine (102) and a material removal system (100). A material removal system (100) includes a recirculation system (200) in fluid communication with a material removal cabinet (104) housing a material removal machine (102). The recirculation system (200) may have an upper reservoir (300) configured to drain fluid into a lower reservoir (204) before recirculating the fluid. The upper reservoir (300) may have a standpipe (320) configured to allow swarf, debris, and/or other material within the fluid to be entrained prior to flowing over the standpipe (320).