Application of combined vane pumps-electric motors with rim transmission of the torque to the impeller

Abstract

The article provides а retrospective analysis of the emergence of prerequisites for the creation of designs of universal pumping units: from the first patents registered in the 1940s to modern technical solutions used at industrial facilities. The possibility of industrial application in the oil industry of fundamentally new types of vane pumps with а combined design of the impeller and rotor or the electric motor, which received а recent impetus to their spread with the development of electric motor technologies, is considered. The fundamental difference between these types or pump is the transmission of the torque to the impeller not through the shaft. but through the rim or the wheel, which is also the rotor of the eclectic motor. The absence or а shaft provides а number of advantages, in particular, it leads to an increase in suction capacity, an increase in pressure characteristics and an increase in operational properties -all this together increases the scope or industrial application of new types or pumps. One of the potential applications of а compact pump of the horizontal type can be the rocking to а frozen oil pipeline by tapping the coil at special points of the pipeline route. From the point of view to transporting high-velocity oil, the design of this type also looks promising; in addition, the possibly of influencing the transported medium by an electromagnetic field is noted. The possibility or using removable impellers of various types for а hollow pump-electric motor is considered, which can significantly increase the scope or application of new types of pumps.

Improved efficiency with concave cavities on S3 surface of a rim-driven thruster

“…The influences of the leakage vortices were limited by the mainstream near the inner surface and prevented from expanding downstream by the blades. (3) The difference between the integrals of the pressure over CC front and CC back produces a torque in the rotational direction of the rotor, which offsets some of the driving torque or consumption torque. This improves the propulsive efficiency of the RDT.…”

“…2 The earliest original geometry of RDT was proposed in a novel patent approximately 80 years ago. 3 Compared to shafting-driven propellers, the ingenious design outperforms the RDT as follows: 4 (i) The compact arrangement saves cabin rooms and is helpful for flexible installation. (ii) The higher motor efficiency is due to the broadband torque transmission through the magnetic field.…”