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TECHNICAL PAPERS

# Performance and Development of a Miniature Rotary Shaft Pump

[+] Author and Article Information
Danny Blanchard, Bruce Gale

Department of Mechanical Engineering,  University of Utah, 50 South Central Campus Drive, Rm. 2110, Salt Lake City, UT 84112

Phil Ligrani1

Department of Mechanical Engineering,  University of Utah, 50 South Central Campus Drive, Rm. 2110, Salt Lake City, UT 84112ligrani@mech.utah.edu

1

Author to whom correspondence should be addressed.

J. Fluids Eng 127(4), 752-760 (Apr 19, 2005) (9 pages) doi:10.1115/1.1949641 History: Received April 21, 2004; Revised April 15, 2005; Accepted April 19, 2005

## Abstract

The development and performance of a novel miniature pump called the rotary shaft pump (RSP) is described. The impeller is made by boring a 1.168 mm hole in one end of a 2.38 mm dia shaft and cutting slots in the side of the shaft at the bottom of the bored hole such that the metal between the slots defines the impeller blades. The impeller blades and slots are 0.38 mm tall. Several impeller designs are tested over a range of operating conditions. Pump performance characteristics, including pressure rise, hydraulic efficiency, slip factor, and flow rate, are presented for several different pump configurations, with maximum flow rate and pressure rise of $64.9ml∕min$ and 2.1 kPa, respectively, when the working fluid is water. Potential applications include transport of biomedical fluids, drug delivery, total analysis systems, and electronics cooling.

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## Figures

Figure 1

Cutaway view of the rotary shaft pump (RSP) impeller. Shown is the radial four-blade impeller. Arrows indicate flow direction.

Figure 2

Cutaway view of the RSP assembly

Figure 3

Open volute configuration

Figure 4

Impeller blade configuration and angles. Impeller shown is the backward-curved four-blade impeller.

Figure 5

Figure 6

Idealized trends of nondimensional pump head and nondimensional flow rate for different impeller designs

Figure 7

Experimental testing apparatus. Differential pressure sensor measures pressure rise across the pump. Motor controller has an output signal for shaft speed and motor current.

Figure 8

Variation of nondimensional pumping head with nondimensional volumetric data for different impeller designs, where each data set is obtained at a constant impeller rotational rate of 10,710 rpm

Figure 9

Nondimensional pressure-rise and flow-rate data for the (a) radial six-blade and (b) backward-curved four-blade impellers for different rotational speeds. Flow rate is varied by using outlet tubing of different inner diameter from 0.254 to 4.5 mm, or by partially closing a valve on the end of the 1.397 mm outlet tubing.

Figure 10

Pressure-rise and flow-rate data for different rotational speeds for the radial six-blade impeller. Data are taken with impeller rotational speeds from 1530 to 15,300 rpm.

Figure 11

Pressure-rise and flow-rate data for different rotational speeds for the backward-curved four-blade impeller. Data are taken with impeller rotational speeds from 1530 to 15,300 rpm.

Figure 12

Hydraulic efficiency for the different impeller configurations as dependent nondimensional volumetric flow rate. Data are taken with impeller rotational speeds from 1530 to 15,300 rpm.

Figure 13

Flow rate and typical size for various micropumps. Typical size is defined by the impeller diameter, diaphragm diameter, or pumping channel width (2-13,17-27).

Figure 14

Pressure-rise and flow-rate data for various micropumps. For all points other than the RSP, the data corresponds to the maximum flow rate and maximum pressure. The data shown for the RSP is for the backward-curved four-blade impeller (2-9,11,13,17-20,23-26).

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