Study on the Sealing Action by Viscous Fluid : The 1st Report, On the Pump-performances of a Screw-type Viscous Pump

強, 浅沼

doi:10.1299/kikai1938.17.60_119

Cited by 5 publications

(9 citation statements)

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“…Flow rate -speed -discharge pressure can be concluded by (11). C. Torque Characteristics [11] With similar discussion to previous section, torque characteristics can be derived from (5).…”

Section: A Basic Fluidic Property Of Screw Pumpsmentioning

confidence: 97%

“…The principle of the pump is simple that carries the fluid along its groove of the thread by the shear stress between the screw and the fluid, but not many theoretical studies have been done [10], [11], [12], [13]. We follow the method of Asanuma [11], [14] due to its simple linear result.…”

Section: Viscous Screw Pumpmentioning

confidence: 99%

“…Literature [11] gives solution to (2) under boundary conditions listed in (3), in Fourier series form, as in (5). All the parameters in the equation were modified from [11] to meet SI unit because the gravitational metric system was used in…”

Section: A Basic Fluidic Property Of Screw Pumpsmentioning

confidence: 99%

“…Flow Characteristics [11] Discharge flow rate of the pump can be calculated with the forward flow rate induced by the friction of the fluid with the screw and the leak flow at the ridge that is induced by the pressure difference. Discharge flow rate q 1 is the difference between the forward flow and the leakage flow as in (7).…”

Section: A Basic Fluidic Property Of Screw Pumpsmentioning

confidence: 99%

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Screw pump for Electro-Hydrostatic Actuator that enhances backdrivability

Kaminaga

Tanaka

Yasuda

et al. 2011

2011 11th IEEE-RAS International Conference on Humanoid Robots

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Force sensitivity and backdrivability are vital functionality of actuators to be used in robots that physically interact with humans. Electro-Hydrostatic Actuator (EHA) is a type of a hydraulic actuator with backdrivability. To improve backdrivability of an EHA, reduction of friction, especially static friction is important. This, however, is difficult because most of the hydraulic pumps require sliding contacts between mechanical components. A viscous screw pump is a variation of a viscous pump that transfers mechanical kinetic energy to fluidic kinetic energy with viscous friction of the fluid. Since this class of pumps does not require mechanical contacts between the rotor and the stator, they are pumps with least static friction. In this paper, design and development of a screw pump targeted for use in an electro-hydrostatic actuator to improve the backdrivability of the actuator system is presented. Pressure-Flow discharge performance of the developed pump and backdrivability performance when combined with a vane motor were evaluated.

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“…Flow rate -speed -discharge pressure can be concluded by (11). C. Torque Characteristics [11] With similar discussion to previous section, torque characteristics can be derived from (5).…”

Section: A Basic Fluidic Property Of Screw Pumpsmentioning

confidence: 97%

Section: Viscous Screw Pumpmentioning

confidence: 99%

Section: A Basic Fluidic Property Of Screw Pumpsmentioning

confidence: 99%

Section: A Basic Fluidic Property Of Screw Pumpsmentioning

confidence: 99%

See 2 more Smart Citations

Screw pump for Electro-Hydrostatic Actuator that enhances backdrivability

Kaminaga

Tanaka

Yasuda

et al. 2011

2011 11th IEEE-RAS International Conference on Humanoid Robots

View full text Add to dashboard Cite

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“…The helical rectangular channels are grooved on the cylindrical rotor surface and the fluid is transported through the channel in the direction of the rotor axis. The viscous pump of this type has been studied by Asanuma [1]- [4] and Takenaka and Noda [5]. They studied the flow experimentally and theoretically, and obtained the relations among the pressure difference between the inlet and the exit of the pump, the flux and the rotational speed of the rotor.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the viscous pump with a helical channel rotor: Torsion effect of the channel

et al. 2010

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The viscous pump, which has a rotor with a helical square channel, is studied experimentally. The non-dimensional channel curvature is taken to be about 0.1. Three types of torsion of the channel are made to investigate the torsion effect on the flow characteristics. We measure the flux through the channel at a constant rotor speed by changing the pressures at the entrance and exit of the pump. We also observe the secondary flow at a crosssection of the channel. Some of the results obtained are shown as follows: The friction factor along the channel to get the same flux is large for large channel torsion at a constant rotation, and becomes small when the favorable rotation of the rotor to the flow is applied. As for the secondary flow in a cross-section, there appear several types of vortex. When there is no rotation, the secondary flow is almost a symmetric two-vortex type for small flux as is the ordinary Dean vortex, but it changes to a four-vortex type when the flux is large. The secondary flow becomes asymmetric as the rotation is applied. We have unsteady flow patterns at large flux and rotation.

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