Displacement Pump Shawn Wilhelm, Post-doctoral Associate University - - PowerPoint PPT Presentation

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Displacement Pump Shawn Wilhelm, Post-doctoral Associate University - - PowerPoint PPT Presentation

Jan 14, 2023 37 likes •360 views

Marquette University | Milwaukee School of Engineering | Purdue University | University of California, Merced | University of Illinois, Urbana-Champaign | University of Minnesota | Vanderbilt University A Linkage Driven Variable Displacement Pump

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Marquette University | Milwaukee School of Engineering | Purdue University | University of California, Merced | University of Illinois, Urbana-Champaign | University of Minnesota | Vanderbilt University

A Linkage Driven Variable Displacement Pump

Shawn Wilhelm, Post-doctoral Associate University of Minnesota Advisor: James Van de Ven

Industry/University Engagement Summit June 6 – 8, 2016

photo

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Hydraulic Systems are Inefficient

  • Low Efficiency of Fluid

Power Flow Control

– 50% Industrial – 20% Mobile

  • $20B wasted annually
  • 150 MMT of CO2
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Axial Piston Bent Axis

Losses In Existing Pumps Do Not Scale

  • Port plates lead to

high constant leakage rates at a given pressure independent of speed

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Variable Displacement Mechanism

  • Vary the stroke of a piston with no other

sliding joints

  • Eliminate Port Plate

Pouliot, H. N., Delameter, W. R., and Robinson, C. W., 1977, "A Variable Displacment Spark-Ignition Engine," No. 770114, SAE International.

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Advantage of Linkage Pump

  • High efficiency at low displacement
  • Losses scale with displacement

1800rpm 5000 psi

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Linkage Concept

Input Crank Slider Link Axis of Slide

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Linkage Concept

Input Crank Slider Link Axis of Slide Connecting Rod

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Linkage Concept

Input Crank Slider Link Axis of Slide Connecting Rod

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Input Crank Slider Link Axis of Slide Connecting Rod Rocker

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Linkage Concept

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Input Crank Slider Link Axis of Slide Connecting Rod Rocker Adjustable Ground Pivot

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Linkage Concept

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Input Crank Coupler Connecting Rod Slider Link Axis of Slide Adjustable Ground Pivot Rocker

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Linkage Concept

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Input Crank Coupler Slider Link TDC Adjustable Ground Pivot

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Linkage Concept

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Input Crank Coupler Rocker Connecting Rod Slider Link Adjustable Ground Pivot Axis of Slide

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Linkage Concept

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Linkage Pump Prototypes

5 Years of Prototype Development

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Pumping Mechanism

Linkage Adjustable Ground Piston Crosshead Bearing 15

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Linkage In Motion

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First Prototype Pump

500 psi, 180rpm, 8.75cc/rev

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Model Agrees with Experiment

Displacement (%) Crank Angle (rad)

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Second Generation Prototype

  • Three cylinder
  • 21MPa (3000 psi)
  • 5kW
  • 30Hz operating

speed

  • Bearings in joints
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Rendering

kj

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Prototype is Smooth & Quiet

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Pump Model: Pressure/Flow Dynamics

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Experimental Results

10 Hz Operation

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Third Generation Pump

3500 psi, 1800 rpm, 11.5cc/rev, Multi-Fluid

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New Pump Mechanism

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Radial Cam Adjustable Linkage Pump

Same Benefits as Crankshaft:

  • Constant Top Dead Center
  • True Zero Displacement
  • High Efficiency Joints
  • Insignificant Leakage

Added Benefits:

  • Control Ripple with Cam Profile
  • Multi-Lobe
  • Compact, Stiff, Lightweight
  • Cam Drives Link, Not Piston

– Low Piston Side Load

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Cam Pump First Gen Prototype

Five Cylinder, 3 Lobe 66cc/rev 5000psi 80-120 RPM

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Efficiency Curves

  • Even at low speed
  • peration, high

efficiencies are achieved

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Double Shear Design Complete

  • Displacement

– 0-15cc/rev

  • RPM

– Nominal 280 rpm – Max 550 rpm

  • Pressure

– Max 350 Bar

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Current Activities

  • Creating a startup to bring the pump to

market

  • Targeting low speed applications where

efficiency is key.

  • Looking for funding sources
  • Applying for June SBIR Solicitation
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How can industry help?

  • The goal is commercialization
  • Flexible to many methods of doing so
  • Looking for industry assistance,

partnership, or direct licensure

  • Trying to development a model for

commercialization of academic research in the fluid power industry

– How might you envision this?

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Thank You