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Rotodynamic pump
Bellows
Axial-flow pump
Axial piston pump
Based on the principle of centrifugal pump and the idea of compact design, an electric-motor-pump is developed. It is integrated by an electric motor, a hydraulic vane pump and a port-plate centrifugal pump as a compact hydraulic power unit. The vane pump is as the main pump of the unit. The port-plate centrifugal pump is designed specially for the main pump to improve the suction performance of the electric-motor-pump. The integrated pump demonstrates some attractive advantages such as more compact structure, lower noise, higher efficiency and no external leakage. By computational fluid dynamics (CFD) method, the effects of the main structural parameters of the port-plate centrifugal pump on its outlet pressure and the efficiency are investigated. The design rules for the port-plate centrifugal pump are concluded. The simulation results show that the port-plate centrifugal pump can raise the inlet pressure of the main pump obviously. When the slope angle of the eccentric tube is 45° and the bias angle is between 45°~60°, the maximum power consumption is only about 0.41% of the electric-motor-pump, which also shows that the port-plate centrifugal pump almost do not influences the whole power characteristics of the electric-motor-pump. Its efficiency can be above 95 percent, and the whole efficiency of the centrifugal pump including the outlet channel is 22%. Power loss occurs due to eddy flow from the outlet of the centrifugal pump to the outlet channel to the main pump.
Rotodynamic pump
Axial-flow pump
Axial piston pump
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Rotodynamic pump
Volute
Axial piston pump
Axial-flow pump
Specific speed
Positive displacement meter
Plunger pump
Diffuser (optics)
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Rotary blood pump will be used widely as a left ventricular assist device. However, one obstacle for the centrifugal pump is an control method that can maintain an optimum flow rate with the physiological condition. Thus, the object of this study is to develop this optimum control system for the centrifugal pump is the aim of this study. Six pigs having an LVAD were subjected for this acute study The LVAD was a Gyro C1E3 centrifugal pump. The assist ratios were changed from 30 to 100 %. In this study, the external work of the motor (the torque ± the motor speed) was compared with the external work of the pump (the pump flow rate ± aortic pressure). There was high correlation between the external work of the actuator and the external work of the pump. Also there was high correlation between the assisted ratio and the external work of the pump. Thus the predicted pump flow rate was calculated from the external work of the motor and aortic pressure. The value of the coefficient of determination (R) between the measured and estimated pump flow rate was 0.8. From these results, the external work of the motor will be useful to control the rotary blood pump. Because this parameter includes the pump flow rate and the after road. This parameter available from intrinsic parameters of the pump and need no sensors. This parameter is simple, yet effective and reliable servo control methods of a rotary blood pump.
Rotodynamic pump
Axial-flow pump
Axial piston pump
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The hydraulic loss of conduit in both vertical pump system and bulb tubular pump system were calculated using the numerical simulation,and the influence of pump impeller diameter on hydraulic loss of conduit was analyzed.Based on the similitude rules of impeller pump,the relationship between pump impeller diameter and nD value and the influence of pump selection and design were analyzed.It is could be concluded that the larger pump impeller diameter may obviously increase the efficiency of both conduit and pump system;increasing pump diameter and decreasing its rotational speed is consistent with reducing nD value.It is suitable to pump system with low head to choose lower nD value,so as a hydraulic model of axial flow pump with the better hydraulic characteristics could be obtained.
Axial piston pump
Specific speed
Axial-flow pump
Electrical conduit
Rotodynamic pump
Diaphragm pump
Hydraulic head
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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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Electric motor-pump is a novel integrated hydraulic power unit which is mainly composed of an electric motor,aport-plate centrifugal pump and a main pump(a high-pressure vane pump).The portplate centrifugal pump is set in the front of oil suction cavity of the main pump to improve the pressure of the inlet of the main pump by utilizing the charging effect and ensure sufficient oil suction of the main pump.The internal flow field model of the port-plate centrifugal pump in the electric motor-pump is set up,the flow field under variable speed is conducted and the comparative analysis on port-plate centrifugal pump charging effect is simulated.The results shows that the total pressure on the outlet port of portplate centrifugal pump(the inlet port of the main pump)enhances continually with the increase of rotational speed and its maximum valve characterizes the oil compensation effect.The maximum value of the total pressure increases rapidly and linearly when the rotational speed is higher than 1 000r/min and it relatively increases by 15.5times when the rotational speed reached 2 000r/min.
Rotodynamic pump
Axial-flow pump
Axial piston pump
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Diffuser (optics)
Axial piston pump
Axial-flow pump
Diaphragm pump
Rotodynamic pump
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For rotating blood pump, the sealing problem is a very important one to solve. In this paper, it was introduced that we designed and made a small axial flow pump, applying the magnetic coupling method. The pump consisted of two pump housings, a brushless DC motor, an impeller with five wanes, a pair of magnetic discs, a spacer, an inlet and an outlet areas , bearings, a support frame, and etc. The pump is made of titanium and is 125 mm length, 147 ml volume, total 380g of weight. Performances of outputting, sealing, heat creating and damage to blood by the pump were investigated in vitro experiment. Results showed for external experiment that: (1)The pressure created by the pump was 90 mmHg, the flow rates were 1.2 L/min, 4 L/min, 5.9 L/min and 7.8 L/min correspondingly to 5000 rpm, 6000 rpm, 7000 rpm and 8000rpm rotation speeds. The hydrodynamic performance of the axial flow blood pump was enough to meet a patient need when the blood pump was used as a left ventricular assistant device. (2)The hemolysis test was studied by the normalized index of hemolysis(NIH). The NIH result of the axial flow pump was 0.08 g/100 L. (3)The outside temperature of the pump didnt change obviously in 120 hours of rotation, and the sealing function was very well.
Axial piston pump
Axial-flow pump
Rotodynamic 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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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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