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

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 photo Advisor: James Van de Ven Industry/University Engagement Summit June 6 – 8, 2016

Hydraulic Systems are Inefficient • Low Efficiency of Fluid Power Flow Control – 50% Industrial – 20% Mobile • $20B wasted annually • 150 MMT of CO 2 2

Losses In Existing Pumps Do Not Scale Axial Piston • Port plates lead to high constant leakage rates at a given pressure independent of speed Bent Axis 3

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. 4

Advantage of Linkage Pump • High efficiency at low displacement • Losses scale with displacement 1800rpm 5000 psi 5

6 Linkage Concept Slider Link Axis of Slide Input Crank 6

7 Linkage Concept Slider Link Connecting Rod Axis of Slide Input Crank 7

8 Linkage Concept Slider Link Connecting Rod Axis of Slide Input Crank 8

9 Linkage Concept Slider Link Connecting Rod Axis of Slide Rocker Input Crank 9

10 Linkage Concept Slider Link Connecting Rod Axis of Slide Input Adjustable Crank Rocker Ground Pivot 10

11 Linkage Concept Slider Link Connecting Rod Coupler Axis of Slide Input Adjustable Crank Ground Pivot Rocker 11

12 Linkage Concept Slider Link Coupler TDC Input Adjustable Crank Ground Pivot 12

13 Linkage Concept Slider Link Connecting Rod Coupler Axis of Slide Input Adjustable Crank Ground Pivot Rocker 13

Linkage Pump Prototypes 5 Years of Prototype Development 14

15 Pumping Mechanism Crosshead Piston Bearing Linkage Adjustable Ground 15

Linkage In Motion 16

First Prototype Pump 500 psi, 180rpm, 8.75cc/rev 17

Model Agrees with Experiment Crank Angle (rad) Displacement (%) 18

Second Generation Prototype • Three cylinder • 21MPa (3000 psi) • 5kW • 30Hz operating speed • Bearings in joints 19

kj Rendering 20

Prototype is Smooth & Quiet 21

Pump Model: Pressure/Flow Dynamics 22

Experimental Results 10 Hz Operation 23

Third Generation Pump 3500 psi, 1800 rpm, 11.5cc/rev, Multi-Fluid 24

New Pump Mechanism 25

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 26

Cam Pump First Gen Prototype Five Cylinder, 3 Lobe 66cc/rev 5000psi 80-120 RPM 27

Efficiency Curves • Even at low speed operation, high efficiencies are achieved 28

Double Shear Design Complete • Displacement – 0-15cc/rev • RPM – Nominal 280 rpm – Max 550 rpm • Pressure – Max 350 Bar 29

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 30

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? 31

Thank You 32