RU2353814C1 - Dispersing stage of submersible multistage centrifugal pump - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention is related to oil machine building and may be used in submersible multistage centrifugal pumps for pumping of formation water. Dispersing stage of submersible multistage centrifugal pump comprises guide vanes 1, consisting of sleeve 2, bushing 3, arranged as metal and connected to each other by polymer flow path 4. In flow path 4 blades 5 are installed, which form channels 6. Bushing 3 of guide vanes 1 via antifriction orifice 7 interacts with metal bushing 8, which is rigidly connected to polymer impeller 9. Bushing 8 with impeller 9 are installed on shaft 10. Between impeller 9 and flow path 4 additional antifriction orifice 11 is installed. Impeller 9 is equipped with additional vanes forming channels 13 for passage of formation water. Main radial vanes 14 are installed on upper plane of impeller 9.

EFFECT: provision of stage unification, increased discharge and interrepair time.

3 dwg

Description

The invention relates to petroleum engineering and can be used in submersible multistage centrifugal pumps for pumping formation fluid.

Known dispersing stage of a submersible multistage centrifugal pump according to the patent of the Russian Federation No. 2209347, class. F04D 13/10, July 27, 2003, comprising a guiding apparatus, an impeller with blades that are located on its lower plane. The impeller is made with holes for additional fluid passage. The impeller is made integral with the sleeve, mating through a key with a drive shaft, on which the blades are located on the lower surface of the impeller. The guide apparatus is made with a disk, below which at the same time a lower disk is made with it, where passages are formed between the latter with the help of blades for liquid to enter the space of the impeller with blades. The impeller and guide vane are made all-metal.

A disadvantage of the known technical solution is a large pressure loss due to significant fluid flows between the lower edges of the impeller blades and the surface of the upper disk of the guide vane. This fact allows the use of this dispersing stage only together with the main working stages, capable of jointly developing the required pressure. The pump requires two types of steps, there is no unification. This design allows you to install in the impeller only one support anti-friction washer, which leads to its rapid wear, which negatively affects the overhaul period. The execution of the impeller and the guide vane all-metal contributes to the rapid deposition of salts and minerals on the surface, which also reduces the overhaul period of the pump.

The objective of the invention is to reduce losses due to the pressure of the stage, increasing its overhaul period and creating a unified stage.

This problem is solved by the fact that in the dispersing stage of a submersible multistage centrifugal pump containing a guiding apparatus with upper and lower disks, between which there are blades, forming channels, an impeller with blades, rigidly connected to a sleeve mated through a key with a shaft, while the impeller is made holes and grooves are formed, limited by blades, on which an anti-friction washer is placed on the lower side, and the guide apparatus is paired with a sleeve, according to the invention, the working the wood is equipped with additional blades on the lower side of the antifriction washer, and the main blades are located on its upper surface, while the impeller and the lower part of the guide apparatus are made of polymer material.

The presence of additional blades on the impeller and the location of the main blades on its upper surface can effectively crush gas bubbles of the reservoir fluid, thereby reducing pressure losses, and the presence of an additional antifriction washer on the underside of the impeller can increase the wear resistance of the stage by reducing specific axial loads, which increases the overhaul period. The execution of the impeller and the lower part of the guide vane from a polymer material can significantly reduce the deposition rate of salts and minerals and increases the geometric accuracy of the channel profile due to the use of precision injection molding technology, which also positively affects the wear resistance of the stage and increase the pressure. This stage is unified and is able to act as the main stage of the pump, providing dispersion and the required pressure. It can be used as a pump of one type of these stages.

The invention is illustrated by drawings, where figure 1 shows two stages of the pump in a section, figure 2 is a section aa in figure 1, figure 3 is a section bB in figure 2.

The dispersing stage of a submersible multistage centrifugal pump contains a guiding apparatus 1, consisting of a cup 2, a sleeve 3 made of metal and interconnected by a polymer flowing part 4. In the flowing part 4 there are blades 5 forming channels 6. The sleeve 3 of the guiding apparatus 1 through an antifriction washer 7 interacts with a metal sleeve 8, rigidly connected to the polymer impeller 9. The sleeve 8 with the impeller 9 is mounted on the shaft 10. Between the impeller 9 and the flow part 4 is installed Lena additional anti-friction washer 11. The impeller 9 is equipped with additional axial blades 12, which form channels 13 for the passage of formation fluid. On the upper plane of the impeller 9 are the main radial blades 14.

The dispersing stage of a submersible multistage centrifugal pump operates as follows.

The shaft 10 transmits the rotation through the sleeve 8 to the impeller 9. When the impeller 9 is rotated with the help of additional and main blades 12 and 14, the formation fluid is directed through the flow part 4 of the guide apparatus 1 into the channels 13 in the impeller 9, first into the zone of the additional axial blades 12 and then into the zone of the main radial blades 14. As a result of centrifugal forces of the main radial blades 14 of the impeller 9, the flow of formation fluid along the inner surface of the cup 2 is directed into the channels of the guide apparatus uyuschey stage. Rotating, the impeller 9 rests on antifriction washers 7 and 11. When the formation fluid passes through the stage, the gas bubbles in the formation fluid are effectively crushed, first with additional axial blades 12, then with the upper edges of the main radial blades 14 of the impeller 9.

Claims (1)

The dispersing stage of a submersible multistage centrifugal pump, comprising a guiding apparatus with upper and lower disks, between which blades are located, forming channels, an impeller with blades, rigidly connected to a sleeve mated through a key with a shaft, and holes are made in the impeller and grooves are formed limited by the blades, and the guiding device is mated to a sleeve, while an antifriction washer is placed between the guiding device sleeve and the impeller sleeve, characterized in that Static preparation wheel is provided with additional blades, and with the lower side of an anti-friction washer, and the main blades are arranged at its top surface with a portion of the impeller and the bottom of the guide apparatus is made of polymeric material.

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