The Influence of Gear Micropump Body Asymmetry On Stress Distribution

Kollek, W.; Osiński, Piotr; Warzyńska, Urszula

doi:10.1515/pomr-2017-0007

Cited by 17 publications

(6 citation statements)

References 16 publications

(18 reference statements)

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“…These losses have an impact on the energy conversion efficiency in these machines [1,16,21,23,29,34,36]. Furthermore, the design parameters of hydraulic components have an influence on energy conversion efficiency [2,3,[10][11][12][18][19][20]32,38].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Water and Mineral Oil on Mechanical Losses in a Hydraulic Motor for Offshore and Marine Applications

Śliwiński

2020

Polish Maritime Research

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In this paper, mechanical losses in a hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted using a special design (prototype) of a hydraulic satellite motor. The design of the satellite motor is presented. This motor was developed to supply both with water and mineral oil and features a non-circular tooth working mechanism. The paper also characterizes sources of mechanical losses in this motor. On this basis, a mathematical model of these losses has been developed and presented. The results of calculation of mechanical losses according to the model are compared with the experimental results. Experimental studies have shown that the mechanical losses in the motor supplied with water are 2.8 times greater than those in the motor supplied with oil. The work demonstrates that the mechanical losses in both the motor supplied with water and the one supplied with oil are described well by the mathematical model. It has been found that for the loaded motor working at high speed, the simulation results differ from experimental ones by no more than 3% for oil and 4% for water.

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Section: Introductionmentioning

confidence: 99%

The Influence of Water and Mineral Oil on Mechanical Losses in a Hydraulic Motor for Offshore and Marine Applications

Śliwiński

2020

Polish Maritime Research

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“…In this article the authors present the use of FEM, which is frequently used in numerical strength calculations (Cieślicki et al , 2019Ghionea et al 2012;Kollek et al 2017;Osiński, Warzyńska 2022), as a method to find the height of the circumferential gap in an external gear pump with consideration the deformation of pump elements. The aim of the work is to show that the deformation of pump elements significantly affects the size of the circumferential gap.…”

Section: Influence Of Circumferential Gap Size On Volumetric Efficiencymentioning

confidence: 99%

An Investigation of the Impact of Pump Deformations on Circumferential Gap Height as a Factor Influencing Volumetric Efficiency of External Gear Pumps

Cieślicki

Karpenko

2022

Transport

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Gear pumps are widely used in transport machines not only in hydraulic drive systems, but also in lubrication and fuel systems. A positive displacement pump converts mechanical energy into pressure energy stored in the liquid, which it transports to the hydraulic cylinder or motor. The efficiency of this process depends on the efficiency of the system components, including the efficiency of the pump, which depends on the amount of internal leakage through the gaps between the high and low pressure sides. The larger the gaps, the lower the volumetric efficiency. This article presents an investigations of impact of pump deformations on circumferential gap height. The article presents a three-dimensional model of an external gear pump using Finite Element Method (FEM) during operating conditions. The model reflects pumping operation at discharge pressures up to 32 MPa and it was validated against strain measurements of pump casing. The simulation results indicate that the pump casing becomes deformed due to pressure, causing a significant increase in the height of the circumferential gap. The increase of the discharge pressure from 8 to 32 MPa causes more than twofold local increase in the height of the circumferential gap. The obtained results indicate that for the correct modelling of the flow generated by gear pumps, it is necessary to consider the change in the size of the gaps resulting from the deformation of the pump.

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“…For users and designers of a hydraulic system, the volumetric and pressure-mechanical efficiency of the hydraulic positive displacement machine (motor or pump) is very important [1][2][3][4][5][6]. So far, these efficiencies are calculated based on the theoretical working volume q t .…”

Section: Introductionmentioning

confidence: 99%

Determination of the Theoretical and Actual Working Volume of a Hydraulic Motor—Part II (The Method Based on the Characteristics of Effective Absorbency of the Motor)

Śliwiński¹

2021

Energies

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In this article, the second method of determination of the theoretical and actual working volume of a hydraulic motor is described. The proposed new method is based on the characteristics of effective absorbency of the motor. The effective absorbency has been defined as the ratio of flow rate in a motor to the rotational speed of the motor’s shaft. It has been shown that the effective absorbency is a nonlinear function of the rotational speed and nonlinear function of the pressure drop in the motor’s working chambers. Furthermore, it has been proven that the actual working volume of a motor is a function of a third degree of pressure drop in the motor’s working chamber. The actual working volume should be taken to assess the mechanical and volumetric energy losses in the motor. Furthermore, the influence of the flowmeter location in the measurement system and the compressibility of liquid on the result of the theoretical and actual working volume calculation was also taken into account and is described in this article. The differences in the assessment of the volumetric efficiency assuming the theoretical and actual working volume was also shown.

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The Influence of Gear Micropump Body Asymmetry On Stress Distribution

Abstract: ABSTRACT

Cited by 17 publications

References 16 publications

The Influence of Water and Mineral Oil on Mechanical Losses in a Hydraulic Motor for Offshore and Marine Applications

The Influence of Water and Mineral Oil on Mechanical Losses in a Hydraulic Motor for Offshore and Marine Applications

An Investigation of the Impact of Pump Deformations on Circumferential Gap Height as a Factor Influencing Volumetric Efficiency of External Gear Pumps

Determination of the Theoretical and Actual Working Volume of a Hydraulic Motor—Part II (The Method Based on the Characteristics of Effective Absorbency of the Motor)

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