Electrification & Early Modern (1870–1920)Fluid Dynamics & Centrifugal Engineering

De Laval's Concentric-Discharge Creamer

US 247,804

A rotating chamber with concentric feed and separated-fluid outlets

Inventor(s)Gustaf De Laval

Grant DateOctober 4, 1881

Filing DateJuly 31, 1879

LocationStockholm, Kingdom of Sweden

US 247,804 describes apparatus for separating a compound fluid by centrifugal action. A rotating chamber receives fluid through a pipe concentric with its vertical axis. Nested, concentric nozzles carry separated streams to two annular receivers. The four claims protect the core inlet-and-outlet combination, a curved outer-fluid pipe, a specified stationary receiver with double central nozzles, and the named radial-feed construction.

USPTO PDF

Audio Engineering Breakdown~2 min listen

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Engineering Analysis & Physical Principles

How It Works: Step-by-Step Mechanical & Physical Breakdown

De Laval describes a separator that receives a mixed liquid continuously and delivers two streams through concentric outlets. In the illustrated milk use, the heavier portion remains nearer the outside of the spinning chamber while cream, the lighter portion, remains nearer the center. The arrangement converts those radial positions into separate overflow paths without making the reader infer a speed, pressure, or performance number that the patent does not give.

The Core Breakthrough Mechanism

Fluid enters through q near the axis and reaches radial channels s s at the bottom of rotating chamber D. The heavier portion tends toward the outer circumference; the lighter portion remains nearer the center. Curved pipe X carries the outer portion to nozzle l and receiving vessel G. Inner nozzle n delivers the lighter portion to H. The separate spouts y y lead the streams away. A flexible upper bearing on driving shaft i allows slight vibration, and the illustrated lower support uses a friction plate z and belt-driven pulley a.

Interactive Real-Time Physical Simulation

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INITIALIZING THREE.JS WEBGL SIMULATION...

Host-Model Telemetry/Computed Readout

Centrifugal Dynamics & Multi-Phase Fluid Separation

Centrifugal G-Force

4,725 ga_c[1]

Fat Separation Yield

99.3%yield[1]

Bowl ω

680.68rad/s[1]

Display ω

5850 °/sω×0.15[1]

Cream Discharge Rate

36 L/hQ_cream[1]

Skim Discharge Rate

264 L/hQ_skim[1]

Centrifugal Separation Force

∂G / ∂RPM (host sensitivity)

2.1 G / RPM

Centrifuge Bowl Speed6500 RPM

Raw Milk Feed Rate300 L/h

Interval ghosts

g4725.0 ×g · [500, 12000]

Fidelity / MMS residual

Residual butterfat in skim vs Stockholm 1879

model0.15 %

reference0.18 %

residual-0.03 %

Coupled channels

drive belt → centrifugal bowl2275 W

Dated scenarios

Detailed Component Architecture

1Concentric inlet and outlets

The feed pipe and at least two discharge nozzles share the vertical axis of the rotating chamber.

Claim 1 requires a hollow chamber rotating on a vertical axis, an inlet pipe concentric with that axis, and two or more likewise concentric nozzles for separated fluids. The patent does not state a nozzle diameter, rotational speed, throughput, or separation percentage.

19th-C. Term: compound fluidModern: A mixed liquid containing portions of different density

2Rotating chamber and radial channels

Chamber D receives the feed and its radial channels carry it outward to the region where separation begins.

The source calls D a strong one-piece chamber of steel, iron, or other metal, nearly elliptical in vertical section. It names radial passages s s and says the greater-specific-gravity portion continues toward the periphery while the lighter portion remains nearer the center.

19th-C. Term: specific gravityModern: Relative density

3Nested discharge paths and receivers

Outer nozzle l and inner nozzle n send the separated portions to annular receivers G and H.

Outer nozzle l discharges into stationary vessel G; inner nozzle n discharges into stationary vessel H. The nested arrangement lets two streams leave through the same central region without remixing, and each receiver has its own spout y.

19th-C. Term: annular compartmentsModern: Ring-shaped receiving vessels with a central opening

4Curved outer-fluid pipe

Pipe X draws the heavier portion from near the chamber wall.

Claim 2 and claim 4 name the curved pipe (called X in the description and x in claim 4). It runs from outer nozzle l down and outward nearly to the chamber's periphery, picking up the heavier separated fluid where centrifugal force concentrates it.

19th-C. Term: curved pipe XModern: Periphery pickup tube for the denser separated phase

Engineering Principles & Equations

Governing Equations & Engineering Principles

Authored explanation paired with its stated mathematical relation

Centrifugal Separation Factor & Interface Neutral Radius

Centrifugal Separation & HydrostaticsClaim 1

Mathematical Governing Law

Terms:

Plain English DecoderHover or tap any highlighted phrase

The magnifies gravitational sedimentation thousands of times via and , establishing a stable between the discharging at and discharging at .

G

Centrifugal Separation Factor

Multiplication factor of centrifugal acceleration relative to standard Earth gravity (

4,000\text{ to }7,000\text{ g}

)

Multiples of g (dimensionless)[1]

Compresses hours of gravity creaming in settling pans into a few continuous seconds inside the spinning bowl.

Physical Principle & Engineering Insight

Gustaf de Laval replaced batch gravitational settling with high-speed continuous fluid stratification. By establishing two concentric discharge weirs at precise radial radii, the spinning liquid bowl continuously separates incoming whole milk into distinct streams of dense skim and light cream without stopping.

Historical Context: US 247804 industrialized dairy processing and created the modern continuous centrifuge used throughout biotechnology, chemical manufacturing, and petroleum refining.

Centrifugal Stokes Buoyant Separation Velocity & Fluid Hydrostatic Stratification

Fluid Mechanics & Centrifugal SeparationClaim 1

Mathematical Governing Law

Terms:

Plain English DecoderHover or tap any highlighted phrase

Inward radial scales with , density difference between and , , and over , generating .

v_{\text{sep}}

Inward Cream Separation Velocity

Radial terminal buoyant migration speed of butterfat globules moving inward toward the bowl axis (

1.5\text{ to }4.0\text{ mm/s}

)

Millimeters / second (mm/s)[L T^-1]

Accelerated 4,000 times faster than gravity, separating whole milk into thick cream and skim milk in under 3 seconds.

Physical Principle & Engineering Insight

Before Gustaf de Laval's 1881 patent, separating cream from milk required setting shallow pans on cellar shelves for 24 to 36 hours while gravity slowly floated fat to the top—during which milk frequently soured. De Laval spun milk in a precision-balanced forged steel bowl at over 6,000 RPM, creating 4,000 Gs of centrifugal force that separated dense skim milk from buoyant cream in 3 seconds, continuously discharging each through separate concentric spouts.

Historical Context: US 247804 industrialized the dairy industry worldwide, gave birth to modern continuous industrial centrifuges, and led de Laval to invent the convergent-divergent supersonic steam turbine nozzle.

Centrifugal Separation of Immiscible PhasesAuthored Principle 1

Stated relation

r_{\text{heavy}} > r_{\text{light}} \quad (\text{when } \rho_{\text{heavy}} > \rho_{\text{light}})

Centrifugal acceleration forces the denser fluid toward the outer radius of the rotating chamber while displacing the lighter fluid toward the center. The patent gives the qualitative physical principle without asserting a specific G-force or separation velocity.

Interactive Schematic Sheet (Fig. 1)

Source-labelled Fig. 1: the apparatus in perspective, including receiving chamber A, stand B, shaft i, support e, and spouts y y.

1.00x

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Why It Still Matters

The patent is a compact account of a continuous centrifugal separator as a set of named flow paths rather than a vague spinning bowl. Its claims distinguish a broad concentric inlet-and-outlet arrangement from more particular geometry: curved pipe X, annular receivers, double central nozzles, and radial feed passages.

Legal Claims Decoder (4 Numbered Claims)

Compare dense legalistic claims directly with decoded plain-English functional specifications.

Claim #1Independent Master Claim

1/4

Verbatim Historical Legal Text

“The combination, with a hollow chamber rotating upon a vertical axis, of a pipe concentric with said axis for the admission of a compound fluid, and two or more nozzles, also concentric with said axis, for the delivery of the separated fluids, substantially as specified.”

Plain English Engineering Translation

Claim 1 protects the basic apparatus combination: a vertical-axis rotating hollow chamber, a centerline inlet for mixed liquid, and at least two centerline outlets for the separated streams.

Key Protected Innovations:

Vertical-axis rotating chamberConcentric feed pipeMultiple concentric discharge nozzles

The Historical Bottleneck

The stated problem is separating a mixed fluid of different specific gravities while it flows, with milk creaming as the named use.

Why Prior Art Failed

•No earlier machine or prior-art limitation is identified in this three-sheet facsimile.

The Breakthrough Insight

“The source joins a vertical rotating chamber, a concentric inlet, and concentric outlets so the heavy and light portions can be collected separately while feed continues.”

After the Grant

The document records parallel patent dates in England, France, Belgium, and Italy as part of its masthead, but supplies no later litigation or sales history.

Civilizational Impact

The source itself presents the apparatus as useful for many operations in the arts and particularly for separating cream from fresh or old milk. This edition does not infer a commercial adoption figure or a legal outcome from that statement.

Historical Specification & Engineering Broadside

I. Historical Context & Grant Summary

II. Core Mechanism & Scientific Principles

III. The Granted Legal Monopoly (Key Claims)

IV. Mechanical Organ Breakdown