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Na Cheng-lie – One of the best experts on this subject based on the ideXlab platform.

  • Investigation of transit flow in double-Acting Pump with composite vanes
    , 2004
    Co-Authors: Na Cheng-lie

    Abstract:

    Aimed at the compressibility of working medium in Pump and taking into account the process of pre-loading and pre-unloading as well as the damping action of vibration-reducing slot in exampled VQ45 Pump, the simulation of transit flow in double-Acting Pump with composite vanes is conducted and, then, the unevenness coefficient of flow is computed. It is found finally that the origin of flow oscillation in double Acting Pump with composite vanes is rested with the Pump working pressure and elastic modulus of the working medium.

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Subban Chinnaiah – One of the best experts on this subject based on the ideXlab platform.

  • Design and analysis of quad-Acting reciprocating Pump: A novel approach
    , 2014
    Co-Authors: Veeramalai Chinnasamy, Sathish Gandhi, R. Kumaravelan, S. Ramesh, Kumar Naveen Kumar, Subban Chinnaiah

    Abstract:

    SUMMARY Reciprocating Pumps are those in which the oscillating motion of pistons, plungers or membranes causes a fluid to move. The discharge of a single-Acting reciprocating Pump is low compared with a double-Acting one for the same input power. In this respect an attempt has been made to increase the discharge by making some modifications in the double-Acting Pump with the same input power. Two additional pistons have been placed vertically and adjacently to the main cylinder. The fluid flow analysis of four quad-Acting reciprocating Pump has been performed in ANSYS FLUENT V12. The various parameters such as mass flow rate of fluid flow, velocity of the fluid flow, volume of the fluid flow and force of the fluid flow have been considered in this paper. These parameters have been studied for each cylinder in an outlet to determine the performance of the Pump. The results show that, using the same input power used for the double-Acting reciprocating Pump, the total discharge of fluid of the four-Acting Pump has been increased.

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Jeroen Van Wittenberghe – One of the best experts on this subject based on the ideXlab platform.

  • Failure investigation and redesign of piston- and Pump shafts
    Engineering Failure Analysis, 2009
    Co-Authors: Wouter Ost, Patrick De Baets, Jeroen Van Wittenberghe

    Abstract:

    Abstract For the application of glue during the production of cars, a double-Acting Pump driven by a pneumatic piston is used. The shafts of the Pump and the pneumatic piston are fixed to each other with a C-shaped split bush, which fits over a groove in both the Pump and the piston shaft. A number of piston- and Pump shafts failed prematurely at the location of the coupling. Following the first fractures, all shafts in use were subjected to a magnetic particle inspection and cracks were found in a large number of them. From the fracture investigation it was shown that the shafts failed due to the propagation of a fatigue crack, starting from a bottom radius of the groove for the coupling bush, caused by cyclic loading during operation. No major initiating defects could be found. The corner radius of the groove was found to match the drawing of the manufacturer. From the investigation of the material it was found that two different materials (42CrMo4 and C45E) were used for the production of the shafts, which matches the materials specified by the manufacturer. The loads Acting on the shafts during operation were checked using strain gauges, and found to be inside the design range of ±45 kN. Using a stress method it was shown that C45E steel was inadequate for this application and that even with 42CrMo4 steel, more care had to be taken in the surface finish of the corner radius. Two new shafts were produced from 42CrMo4 steel, with a polished (instead of turned) bottom radius. These shafts were subjected to a fatigue test of 2 million load-cycles with load varying between +45 and −45 kN (constant amplitude test). Both shafts were able to withstand this load without failure. The shaft design has been changed and no further shaft fractures have occurred.

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