Analyzing Rotor Profile’s Effects to Performance of Roots Vacuum Pump Applied the CFD Method

2019 ◽  
Vol 889 ◽  
pp. 518-525
Author(s):  
Thanh Tung Nguyen ◽  
Bui Ngoc Tuyen ◽  
Van The Tran
Keyword(s):  
Geometric Analysis ◽  
Vacuum Pump ◽  
Pump Performance ◽  
Outlet Pressure ◽  
Rotor Profile ◽  
Fluent Software ◽  
Simulation Results ◽  
Cfd Method ◽  
Rotor Profiles ◽  
Lobe Pump

The paper is mainly focused on analysis characteristics of lobe pump with three different tooth profiles: Circular, Epi-cycloidal and Circular–Involute–Circular (CIC) rotor profiles. Based on the geometric analysis and mathematical model, the CIC rotor profile combined Circular–Involute–Circular is generated. In this paper, the CFD techniques are used to estimate the effects of tooth profile and lobe number to the pump performance. The simulation results obtained from FLUENT software illustrated that the rotor profile effects remarkably to the pump performance. The outlet pressure of CIC rotor profile is higher than that of the circular and epi-cycloidal rotor profiles. The numerical outcomes also showed that higher rotor’s speed is resulted in higher outlet pressure. Besides, the lobe number of rotor has effect slightly to the pump performance.

A Novel Rotor Profile Generation Method for Claw-Type Vacuum Pumps Based on Sealing Line

2019 ◽  
Vol 894 ◽  
pp. 34-40
Author(s):  
Trong Linh Nguyen ◽  
Yu Ren Wu
Keyword(s):  
Curve Fitting ◽  
Vacuum Pump ◽  
Quadratic Functions ◽  
Spline Curve ◽  
Leakage Path ◽  
Rotor Profile ◽  
Fitting Method ◽  
Curve Fitting Method ◽  
Rotor Profiles ◽  
Cubic Spline Curve

The sealing line between two conjugated rotors is a main leakage path in the vacuum pump, however, it is unable to be adjusted before the rotor profiles are determined in the traditional rotor profile generation method. Therefore, a generation method of rotor profiles for claw-type vacuum pumps based on the sealing line is proposed in this paper. The sealing line can be firstly specified as specific segments regarding the characteristics of claw-shaped rotor profiles. By applying the enveloping theory and the cubic spline curve fitting method, the rotor profile is able to be generated from the sealing line. Moreover, the adjustment method is proposed to segmentally correct the shape of sealing line using the quadratic functions by considering the geometric limitations to avoid interference and undercutting in rotor profiles. A three-lobe claw rotors profile is carried out to demonstrate the reasonability and stability of the proposed method.

Influence of Gerotor Performance in Varied Geometrical Design Parameters

2009 ◽  
Vol 131 (12) ◽  
Author(s):  
Chiu-Fan Hsieh
Keyword(s):  
Design Parameters ◽  
Stress Variation ◽  
Pump Performance ◽  
Geometrical Design ◽  
Area Efficiency ◽  
Outlet Pressure ◽  
Rotor Profile ◽  
Sealing Performance ◽  
Gerotor Pump ◽  
Theoretical Stress

Gerotor performance is influenced by sealing properties, area efficiency, contact stress, and outlet pressure. This paper uses the hypotrochoidal curve to generate the gerotor profile, and adopts the curvature difference method to assess the sealing property and predict the stress on the rotor profile. Numerical examples show that this method can successfully estimate and forecast the rotor sealing and the Hertz stress variation. For confirmation, these results are proved by theoretical stress calculations and software simulations. This paper also presents the results of sealing performance, stress variation, area efficiency, and outlet pressure for various geometrical design parameters. These results can serve as a pump performance reference, assisting designers wishing to create a better gerotor pump.

The Profile and Structure Design on Trochoidal Vacuum Pump

2010 ◽  
Vol 129-131 ◽  
pp. 453-457
Author(s):  
Zhi Jun Zhang ◽  
Shi Wei Zhang ◽  
Cheng Hai Xu
Keyword(s):  
Slenderness Ratio ◽  
Structure Design ◽  
Vacuum Pump ◽  
Key Factors ◽  
Pump Performance ◽  
Maximum Value ◽  
Rotor Profile ◽  
Utilization Ratio ◽  
And Performance ◽  
Design And Manufacture

Vacuum pump plays an important role in vacuum applications. The rotor and stator profile is one of the key factors for improving pump performance. In this paper, the traditional trochoidal vacuum pump that the rotor and stator profile both are trochoidal equation was introduced. The profile of trochoidal vacuum pump with two angle rotor was studied. In order to simply the design and manufacture, the rotor profile was substituted by the arc curve. The design parameter and performance was deducted on slenderness ratio. The slenderness ratio should larger than 4, otherwise the down part of the stator profile would be dent to upper. When slenderness ratio is 4, the utilization ratio of volume would be getting the maximum value, 0.5851942. The utilization ratio of volume was decreased with the slenderness ratio increased.

Simulation Study for the Effects of Clearance Volume on Full Metal Single Screw Pump Performance

2013 ◽  
Vol 561 ◽  
pp. 368-373
Author(s):  
Jun Fei Wu ◽  
Fan Guo Meng ◽  
Xu Ping Zhang ◽  
Ying Yu
Keyword(s):  
3D Model ◽  
Pressure Change ◽  
Screw Pump ◽  
Pump Performance ◽  
Outlet Pressure ◽  
Single Screw ◽  
Fluent Software ◽  
Volume Method ◽  
Pressure Changes ◽  
Stators And Rotors

The stators and rotors of full metal screw pump take way of clearance fit, so the clearance value will directly affect the pump lifting performance and efficiency. Firstly using the finite volume method to establish a full-metal single screw pump 3D model, secondly using FLUENT software to calculate outlet pressure changes with different series of clearance value between the stator and the rotor of the pump in condition of the same inlet pressure .lastly Drawing outlet pressure change curves to evaluate the concrete effect of clearance volume on the performance of the pump. The results indicate that the pump outlet pressure increased first and then decreased with increasing clearance value and that pump has good lifting oil capacity with clearance value which is less than 0.5mm.

Inter-lobe clearance estimation for twin-screw rotor pairs with point-meshing features

2020 ◽  
pp. 095440892097139
Author(s):  
Minh-Thuận Hoàng ◽  
Yu-Ren Wu
Keyword(s):  
Cad Model ◽  
Screw Pump ◽  
Pump Performance ◽  
Leakage Path ◽  
Rotor Profile ◽  
Shortest Distance ◽  
Twin Screw ◽  
Screw Rotor ◽  
Rotor Profiles ◽  
Solution Accuracy

In practical production, it is impossible even to measure the inter-lobe (meshing) clearance of a screw rotor pair. However, understanding of the clearance distribution is essential since it is a major leakage path which greatly affects the twin-screw pump performance. Previous publications did not disclose explicit detail on how to calculate the meshing clearance for screw rotor pairs with point-meshing features. Therefore, this study proposes a meshing clearance calculation method for screw rotor pairs with point-meshing features. The complex meshing clearance can be simply determined by calculating the shortest distance between two normal-rack profiles generated using point-enveloping principle. Clearance distributions are much more intelligible to be exhibited on a 3-D contact line and the rotor profile. Due to its immeasurability in practice, the adaptability and the solution accuracy of the proposed numerical method are verified by applications on different rotor profiles and comparisons with measured results from a 3-D CAD model. The meshing clearance in a variable-pitch screw rotor pair and the clearance adjustability are also illustrated through the proposed examples.

The Influence of the Convective Terms Discretization Scheme on the Simulation Results of Architectural Numerical Wind Tunnel

2012 ◽  
Vol 204-208 ◽  
pp. 4884-4887
Author(s):  
Jian Feng Wu ◽  
Cai Hua Wang ◽  
Chang Li Song
Keyword(s):  
Numerical Simulation ◽  
Wind Tunnel ◽  
Building Structures ◽  
Discretization Scheme ◽  
Shape Coefficient ◽  
Fluent Software ◽  
Actual Operation ◽  
Simulation Results ◽  
Load Shape ◽  
Numerical Wind Tunnel Method

The numerical simulation of construction is to obtain the desired accuracy. It depends on the theoretical basis of the calculator and selection of the various important factors in the actual operation. For this problem, this paper adopting the current code for the design of building structures as the comparison standard, using the FLUENT software, taking the numerical simulation results of a high building’s wind load shape coefficient of for example, discussing the influence of four kinds of the convective terms discretization scheme, respectively the first-order upwind, the second order upwind , power law and Quadratic upwind interpolation for convective kinematics, on the simulation results of architectural numerical wind tunnel, provides the reference for the rational use of numerical wind tunnel method.

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