Calculation of Unloading Area of Internal Gear Pump and Optimization

Shan-xin, Guo; Chen, Dagui

doi:10.1155/2020/7319871

Cited by 3 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the formula, D is the computational domain of the flow field, x′ and x represent the vectors before and after filtering, respectively, and G represents the filter function. e commonly used filter function G is divided into two categories: uniform filter and nonuniform filter [17,18]. However, when carrying out the numerical simulation of wall turbulence, the normal grid in the near-wall area must be densified according to the proportional rules.…”

Section: Construction Of Fiv Modelmentioning

confidence: 99%

Simulation of Flow-Induced Vibration and Dynamic Performance of Circular-Arc Helical Gear Pump under Background of Machine Learning

Wei

Feng

Han

et al. 2022

International Transactions on Electrical Energy Systems

View full text Add to dashboard Cite

At present, with the continuous development and great improvement of mechanical manufacturing, processing, and assembly technology, mechanical flow-induced vibration (FIV) with a relatively concentrated frequency domain can be controlled by active and passive noise reduction methods. However, whether it is active noise reduction or passive noise reduction, they all focus on how to suppress the transmission of sound waves and cannot solve the problems of flow leakage, obvious temperature rise, and noise excitation from the root cause. Therefore, it is necessary to determine the location of the primary and secondary excitation sound sources of FIV, the identification of true and false sounds, and the characteristic relationship between flow and noise. This provides a theoretical basis and engineering application direction for the mechanism of noise reduction of FIV. The numerical calculation part of the acoustics in this paper is solved by the hybrid method, and the flow field is discretely calculated by the large eddy simulation (LES) module in the Fluent software. When the calculated flow field is stable, the velocity field of one impeller rotation period is selected to be output as the iterative value of the sound field and imported into ACTRAN for Fourier transform. Then, the sound field calculation is carried out, and the result of the spatial and temporal variation of the sound field is finally obtained. Through experiments, it was found that when the load of the gear pump is 8 MPa, the volumetric efficiency of the optimized circular-arc helical gear pump of the sliding bearing was improved by about 4%. When the rotation speed is 2100°r/min, the arc helical gear pump reduced the surface temperature rise by 2.5°C. This verified that the optimized performance of the sliding bearing in the arc helical gear pump is significantly improved. Through the theoretical model of the temperature rise of the sliding bearing, the phenomenon that the surface temperature of the prototype gear pump was not significantly increased with the loading in the low pressure region is explained.

show abstract

Section: Construction Of Fiv Modelmentioning

confidence: 99%

Simulation of Flow-Induced Vibration and Dynamic Performance of Circular-Arc Helical Gear Pump under Background of Machine Learning

Wei

Feng

Han

et al. 2022

International Transactions on Electrical Energy Systems

View full text Add to dashboard Cite

show abstract

“…e leakage will cause the power loss of the internal gear pump. Guo [2] used the CFD method to numerically simulate the pressure field and the velocity field and analyzed the effects of extrusion power loss, pressure and viscous power loss, rotation speed, and tooth width on flow field characteristics. Zeng [3] established the geometric relationship during the meshing process, and the unloading area expression was obtained by using the geometric pattern expansion method with the variable f as the independent variable.…”

Section: Introductionmentioning

confidence: 99%

[Retracted] Steady‐State Flow Characteristics and End Clearance Optimization of Internal Gear Grease Pump

Tang

Qian

2021

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The internal gear grease pump is a mechanical device used for transfer of high viscosity fluid. The existing clearance between the end faces of the internal or external gear and the floating side plate might cause pump leakage during operation. In order to obtain the optimal end clearance of the internal gear grease pump, the rheological features of the lubricating lithium-based grease for various temperatures are explored via rotating rheometer. Shear force and apparent viscosity are chosen as monitored experimental parameters. The experimental data is fitted to obtain grease rheological features at various temperatures. The end clearance flow field model and the leakage model are established. Fluent software is employed for solving the flow field model and exploring the effect of temperature, end clearance, and speed on grease leakage. Superior grease flow performance is observed with an increase in temperature, which makes it to easier for the grease to leak from the end clearance. With an increase in the end clearance and the working pressure of the pump, an increase in leakage is also observed. Furthermore, it is found that rotational speed also affects the pump leakage. The leakage mechanism is obtained by combining the rheological features of the grease at the end clearance. The mathematical model method is utilized to solve for the optimal value of the end clearance.

show abstract

“…From equation (16) and (17), the positions of V 10 and V 20 are shown in Figures 7 and 8, respectively. V 10 and V 20 can be obtained from (19), (20), (24), and (25).…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…(2) Find the curve equations of 12, 23, 34, 4F, F5, 56. (3) Solve the integral to calculate the unloading area, the method, and steps referring to [20].…”

Section: Unloading Areamentioning

confidence: 99%

Simulation Research on Trapped Oil Pressure of Involute Internal Gear Pump

Shan-xin

Guan²

2021

Mathematical Problems in Engineering

Self Cite

View full text Add to dashboard Cite

The main structure of an internal gear pump consisted of an internal gear pair, including an internal gear and an external gear. The internal gear pump had oil trapping phenomenon like other hydraulic gear pumps. In order to solve the oil trapping phenomenon of involute gear pump with internal meshing tooth profile, in this paper, the mathematical equation of gear outer contour is established according to the principle of generation method, and the variation law of the trapped oil area in meshing process is deduced by theoretical instantaneous flow rate obtained by scanning method. Then, the minimum trapped oil volume and unloading area are solved by the graphic method. Finally, based on fluid mechanics and dynamics, the trapped oil pressure model is obtained. The change of the trapped oil area and trapped oil pressure in a meshing cycle is simulated by MATLAB. The results show that the trapped oil area changes in a parabola, and the trapped pressure fluctuates in mountains and valleys. When the trapped area is the smallest, the trapped oil pressure reaches the peak at the corresponding corner. The research results can provide guidance for the development of high-performance internal gear pumps.

show abstract

Calculation of Unloading Area of Internal Gear Pump and Optimization

Cited by 3 publications

References 7 publications

Simulation of Flow-Induced Vibration and Dynamic Performance of Circular-Arc Helical Gear Pump under Background of Machine Learning

Simulation of Flow-Induced Vibration and Dynamic Performance of Circular-Arc Helical Gear Pump under Background of Machine Learning

[Retracted] Steady‐State Flow Characteristics and End Clearance Optimization of Internal Gear Grease Pump

Simulation Research on Trapped Oil Pressure of Involute Internal Gear Pump

Contact Info

Product

Resources

About