Owing to their impressive properties reciprocating positive displacement pumps are used in many applications. Pumping fluids at high delivery pressures and metering are the areas of frequent use. The design of reciprocating pumps requires an exact knowledge of the appearing phenomena such as unacceptable pipeline pulsation and harmful cavitation. But cavitation in reciprocating positive displac...

For a hermetic reciprocating compressor of the household refrigerator, it is not economic to set a separate oil pump, because of cost and space demands. Its oil supply system is mainly promoted by a reed pump and the spiral groove on the shaft. When the compressor is operating, the oil climbs up the inner wall of the reed pump because of the centrifugal force. The height to which the oil could ...

In order to discuss the surface pressure pulsation characteristics of magnetic-fluid sealing membrane centrifugal pump, this paper studies shaft end under different flow operating conditions pump based on combination numerical calculation and experimental verification. The results show that value film decreases with increase rate has periodic pulsation, period is time required for a single blad...

The failure reasons of reciprocating sealing in OPI-1800AWS fracturing pump are analyzed by scanning electron microscope technology (SEMT). The lubrication mechanism of plunger seal friction pair is analyzed by hydrodynamic lubrication theory. During its discharge and suction stroke, the reciprocating sealing friction pair meets the conditions of hydrodynamic lubrication, a certain thickness of...

Reciprocating diaphragm micro-pumps are the most common type among indirectly–driven micro-pumps. They operate by reciprocating the diaphragm with associated check valves. This paper addresses the Hydroelastic vibration of circular elastic diaphragm interacting with the incompressible and inviscid liquid inside the cylindrical chamber with a central discharge opening. Taking into account axisym...

= Abstract =A new version of a moving actuator electromechanical total artificial heart was designed to improve the total efficiency, durability, and fit inside the thoracic cavity. Compared with our present type of rolling-cylinder actuator, this new model has a pendulum-type actuator with reciprocating motion around a fixed circular path connected through the gear mechanisms to the motor. By ...