The Influence of Radial and Axial Gaps on Volumetric Efficiency of External Gear Pumps

Szwemin, Paulina; Fiebig, Wiesław

doi:10.3390/en14154468

Cited by 19 publications

(11 citation statements)

References 18 publications

(31 reference statements)

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“…Szewim [31], described the influence of radial and axial clearances on the volumetric efficiency of a gear pump and the application of CFD models for dynamic flow analysis in the meshing zone and suction chamber. Considering that on the example of this gear pump, the gear fits according to standards and tolerances, the volumetric efficiency is determined based on leaks on the sealing elements of the pump chamber.…”

Section: Resultsmentioning

confidence: 99%

Analysis of the influence of hydraulic fluid quality on external gear pump performance

Novaković¹,

Radovanović²,

Zuber³

et al. 2022

Eksploatacja i Niezawodność – Maintenance and Reliability

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The basis of every hydraulic system is based on energy transformations, which are realized through hydraulic working fluid. Hydraulic oils are certainly subject to changes within their structure, meaning the basic characteristics and parameters of hydraulic oil, such as density, viscosity, humidity. The oils that are exploited are exposed to the process of degradation, which largely leads to significantly poorer quality of hydraulic fluid. The paper deals with the influence of changes in the characteristics of the hydraulic fluid on the hydraulic operating parameters of the gear pump installed on the hydraulic press. The parameters refer to pressure, flow, and temperature, as well as the quality of hydraulic oil, which affects the volumetric efficiency of the pump, and the results presented in the conclusion are based on the measured values of parameters before and after corrective measures. The control of parameters aims to increase the efficiency and reliability of the hydraulic system, a way of modern detection of deviations of parameters from standard, required values.

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Section: Resultsmentioning

confidence: 99%

Analysis of the influence of hydraulic fluid quality on external gear pump performance

Novaković¹,

Radovanović²,

Zuber³

et al. 2022

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…Chen et al adopted an evolutionary structural optimization method to optimize the rotor design of the Roots pump, and the safety and stability of the optimized structure were significantly improved [11]. When a gear pump is functioning, the essence of its gear rotor engagement is collision contact, which cannot avoid vibration and other problems, resulting in a certain degree of leakage [12]. In addition, low efficiency, loud noise in working, and ease of wear are the gear pump's shortcomings.…”

Section: Literature Reviewmentioning

confidence: 99%

Modeling, Kinematic Characteristics Analysis and Experimental Testing of an Elliptical Rotor Scraper Pump

Zhang

Yang

et al. 2022

Machines

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Against the backdrop of the rapid burgeoning of international energy engineering, the efficient utilization of energy is a paramount factor. The key idea in this paper is to propose an elliptical rotor scraper pump (ERSP) in order to address the imperfections and defects of traditional volume pumps, such as their labyrinthine design, low volume utilization efficiency and undesirable sealing performance. The ERSP can dramatically achieve the aims of ameliorating pump structure and improving energy efficiency. One of the Roots pump's rotors or the vane pump's shifting blade is replaced by a swing scraper in the ERSP. It is worth noting that a small swing range is a high-priority feature of the scraper; the scraper not only serves the purpose of dividing the pump cavity and self-sealing the unit but also reduces the noise level when working. A vital function of ERSP is the efficient conversion of mechanical energy into fluid pressure energy by changing the volume. Simultaneously, based on theoretical analysis, the mathematical model of the ERSP is established, and its kinematic characteristics are investigated, using ADAMS to verify the kinematic rationality of the ERSP. Ultimately, the research group manufactured a prototype of the pump, based on the previous simulation results and calculations, and experiments verified the feasibility of the pump. The design and research of the ERSP have essential reference significance for the development of fluid energy machinery technology.

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“…These two factors have a significant influence on the extent of the internal leaks. Even a limited increase in the pressure difference or in the gap height causes a significant decrease in the flow rate generated by the gear pump (Borghi et al 2009;Guo et al 2020;Szwemin, Fiebig 2021). Therefore, a precise model of this flow rate and of the volumetric efficiency of the pump necessarily depends on the precise knowledge of the height 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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The Influence of Radial and Axial Gaps on Volumetric Efficiency of External Gear Pumps

Cited by 19 publications

References 18 publications

Analysis of the influence of hydraulic fluid quality on external gear pump performance

Analysis of the influence of hydraulic fluid quality on external gear pump performance

Modeling, Kinematic Characteristics Analysis and Experimental Testing of an Elliptical Rotor Scraper Pump

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

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