Balancing axial force in centrifugal pumps with pump out vanes
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Abstract:
Application of pump out vanes is one of the solutions to reduce hydraulic axial force generated during centrifugal pump operation. This article presents the cause of the occurrence of hydraulic axial force and method of calculating pressure distribution at the rear of the impeller used to design pump out vanes properly. It illustrates results of pump out vanes CFD calculations and its validation by measurements. The article reviews the methods of reducing pressure on the rear wall of the centrifugal pump's rotor using pump out vanes. It presents empirical formulae allowing calculation of pressure depending on the geometrical parameters of the blades. The article presents various design solutions of pump out vanes.Keywords:
Axial-flow pump
Rotodynamic pump
Axial piston pump
Specific speed
Gear pump
Rotodynamic pump
Volute
Plunger pump
Gear pump
Axial piston pump
Piston (optics)
Reciprocating motion
Slip factor
Positive displacement meter
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The rod pumping pump is the most important key parts of the rod pumping system.For promoting technical advance of rod pumping and improving the production economic benefit,a series new rod pumping pump was successful improved in foreign country,two new pumping viscous oil pumps,i.e.the dual string pump and multi-phase pump;four new sand control pumps,i.e.corrosion-resist pump,self-rotating plunger pump,sand and gas control pump rotational flow plunger pump;three high efficient bottom hole pumps,i.e.coiled tubing pump,down stroke pump,pump with collecting plunger.
Plunger pump
Axial-flow pump
Axial piston pump
Gear pump
Screw pump
Rotodynamic pump
Sucker rod
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Diffuser (optics)
Axial piston pump
Axial-flow pump
Diaphragm pump
Rotodynamic pump
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Study on the Influence of Flow Distribution Structure of Piston Pump on the Output of Pulsation Pump
According to the working principle of the A10VNO swashplate axial piston pump, the output flow model of an axial piston pump in an ideal state and the output flow theoretical model of an axial piston pump considering the leakage and flow distribution process are established. The output flow pulsations of odd and even piston pumps are simulated and analyzed by Matlab, and the influence of a closed dead angle and a mismatch angle of the port plate on the output flow pulsation of the pump is obtained. Based on the theoretical model, AMESim is used to establish the overall model of the axial piston pump considering leakage, flow distribution process and oil compressibility under constant working conditions. By setting six different flow distribution boundary conditions corresponding to the theoretical research, the influence of flow distribution plate structure on pump output flow pulsation is studied. A test-bed was built and verified by experiments. The results show that when the mismatch angle of the valve plate is 3–5° and the dead angle is 6–10°, the difference between the output flow pulsations of the odd and even piston pumps is very small, so in the hydraulic pump hydraulic motor system, when the hydraulic pump is used as a hydraulic motor under the condition of power recovery, the odd number or adjacent even number of hydraulic motors are appropriate.
Axial piston pump
Axial-flow pump
Piston (optics)
Plunger pump
Leakage (economics)
Rotodynamic pump
Volumetric efficiency
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A new type of axial piston hydraulic motor pump is presented,and its structure and characteristics is introduced briefly.The flow field of the axial piston hydraulic motor pump is numerical calculated and analyzed by the use of computational fluid dynamics method.The pressure and velocity distribution of flow field at different speed and rotation angles is analyzed in the paper.The results show that with the rotor speed increased,the pressure of plunger chamber decrease significantly,but the pressure loss is increased,so the rotation speed of the pump should not be too high.Through comparative analysis of the flow field,it can provide an effective reference for optimal design of flow channel.
Plunger pump
Axial piston pump
Piston (optics)
Rotodynamic pump
Internal flow
Axial-flow pump
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Rotodynamic pump
Volute
Pressure head
Axial piston pump
Axial-flow pump
Gear pump
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The causes of centrifugal pump vibration are analyzed,such as insufficient pump suction height,too low operating flowrate,insufficient light ends separation,blocking of pump inlet pipeline,improper design of pump flow pass and pump impeller vane,non-symmetry of pump shaft and poor fixing of pump body,etc.The corrections are recommended like raising the liquid height at the suction of pump and reducing lengths of pump inlet pipelines and pipe fittings,adding minimal flow recycle line,cleaning out foreign materials in the pipeline,improving internal construction design of pumps and consolidating pump body,etc.
Rotodynamic pump
Axial-flow pump
Specific speed
Axial piston pump
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Volute
Rotodynamic pump
Positive displacement meter
Plunger pump
Specific speed
Axial piston pump
Gear pump
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Abstract: This article describes comparative studies of a newly developed “straight path” centrifugal pump (Capiox centrifugal pump) targeted for open‐heart surgery and circulatory support. A unique straight path design of the rotor was very effective in reducing the pump's rotational speed and prime volume. This pump was evaluated for hydraulics, hemolysis, depriming characteristics, cavitation, and heat generation. Two commercially available centrifugal pumps, the Biomedicus cone‐type pump and the Sarns 3M impeller‐type pump, were used as controls. The new pump required the lowest pump speed to produce the same flow rates under the same pressure loads and demonstrated the lowest hemolysis and the lowest temperature rise with the outlet clamped. The air volume required to deprime the new pump was one‐third to one‐half that for the other pumps, and no sign of cavitation was observed even if a small amount of air was introduced to the pump inlet under a negative pressure of 200 mm Hg.
Rotodynamic pump
Axial-flow pump
Axial piston pump
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