Double-cone device and pump
AssigneeDCT Double-Cone Technology AG
InventorsJohn Stark, Hansjorg Wagenbach, Jorg Schar
Life of this patent
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Abstract
The performance of a double-cone device (1) is increased, not only by moving the gap or inlet openings (22) a short distance into the exit cone (47), but also by making the conicity θ3 (55) of the so-formed small diffuser less than the conicity θ2 (109) of the remaining part (53) of the exit cone. Double cone units (7, 60), particularly the ones with this improved diffuser, may be used in pump installations (1, 60), like well-pumps (1), where liquids must be pumped from great depths.
Claims8
Double-cone device (7) for creating a pressure difference in a fluid penetrating the device, the device essentially consisting of an entry unit (29) and an exit unit (47), each of essentially hollow frustroconical shape, and the entry unit (29) and the exit unit (47) being connected by their respective first ends of small diameter creating an orifice (45), characterised in that at least one first inlet opening (22) is provided in the exit unit in a distance from its first end, so that between the inlet opening (22) and the first end of the exit unit a diffuser section (49) of increasing cross-cut and an effective length L exists in order to decrease noise and/or wear of the double-cone device, wherein the diffuser section provides a conicity less than that of the exit cone.
A pump arrangement (1, 60) for pumping liquids including gases from great depths, preferably from the bottom of wells like oil wells, characterised by a circuit for a working fluid, wherein the circuit comprises a supply conduit, a drain conduit, a circulating pump device (3), a double cone unit (7) and means (36) for discharging the pumped liquid, which are connected to allow a circulating fluid to circulate through pump device (3), supply conduit, double-cone device, drain conduit and pump device (3), and the discharge means (36) being arranged within one of the said conduits so that the pumped liquid inserted by the double cone into the circulating fluid stream can be recovered by the discharge means (36).
Dependencies are inferred from the claim text.