RU2238440C1 - Oil well vertical centrifugal pump drive - Google Patents

Abstract

FIELD: oil producing industry.

SUBSTANCE: invention is designed for pumping process water into bed at oil production. Proposed drive contains drive shaft, housing, connected clutches, bearing units and sealing unit. Flexible clutch is used to connect electric motor and drive shaft. Clutch connecting centrifugal pump with drive shaft consists of clutch members with flanged sections carrying rigidly installed pins located on one diameter. Flexible disk is installed between clutch members. Said disk is made up of steel flexible foil secured in central zone and provided with holes in number equal to number of pins of clutch member. Bearing units and sealing unit are installed for transverse displacement in process of mounting, which, in combination with flexible clutch installed in places of connection of electric motor with drive shaft and drive shaft with pump shaft, provide alignment of shafts in operation of drive.

EFFECT: improved operation reliability of drive, reduced labor input in manufacture of parts and units providing axial alignment of shafts.

6 dwg

Description

The invention relates to the field of pump engineering, in particular to vertical drives of borehole pumps, and is intended for pumping industrial water into the reservoir during oil production.

A well-known drive of a borehole submersible screw pump, including a support unit, an electric motor, a worm gear, a stand, a wellhead seal, a V-belt drive, pump rods, a hollow shaft and a clamp (RF patent No. 2136965, MKI 7 F 04 V 47/02, 1999).

The disadvantages of the design are:

- unsatisfactory value of efficiency, due to the presence in the design of a worm gear having an efficiency of 70-75%;

- unsatisfactory service life due to the relatively rapid wear of the contacting surfaces of the worm-wheel pair in continuous operation.

Also known is a surface drive of a borehole screw pump, consisting of an electric motor, a gear module, a gearbox with drive and intermediate shafts, suspension and sealing units and connecting couplings (RF patent No. 2139448, MKI 7 F 04 B 47/02, 1999).

The disadvantages of the device:

- significant operating costs due to the need for preventive maintenance of the sealing unit located in a hard-to-reach zone, as well as the difficulty in achieving alignment of the shafts of the module and gearbox;

- the high complexity of manufacturing, due to the presence in the design of a large number of parts, which are subject to stringent requirements.

The closest in technical essence to the invention is the drive of a vertical borehole centrifugal pump comprising a drive shaft, a housing, a base, couplings, a ball bearing assembly and a sealing assembly including a housing and sealing elements, a sliding bearing assembly including a housing, and an electric motor. (Vertical centrifugal pumping unit UNCV-125-1500. Operation manual. AFNI.062664.005RE. IZHNEFTEMASH, 2001, p.13-16, fig. 1-4.)

The main disadvantages of the known drive are:

- low operational reliability due to the rapid failure of the bearing assembly and the sealing assembly, due to the fact that during installation it is impossible to achieve alignment of the shafts of the electric motor, pump and drive shaft due to their rigid arrangement in the housing;

- the high complexity of the manufacture of some parts and assemblies, due to increased requirements for their manufacture in order to achieve the desired alignment of the shafts.

The objective of the invention is the creation of a drive with increased operational reliability and low complexity of manufacturing its parts and assemblies, ensuring the alignment of its shafts.

The technical result is achieved by the fact that in the drive of a vertical borehole centrifugal pump containing a drive shaft, a housing, a base, couplings, a ball bearing assembly and a sealing assembly including a housing and sealing elements, a sliding bearing assembly including a housing, and an electric motor, according to the invention, a ball bearing assembly made removable and together with the sealing unit installed with the possibility of displacement perpendicular to the axis of the drive during installation; the sealing unit is provided with a glass in which the sealing elements are located, the glass of the sealing unit and the bearing housing, respectively, relative to the housing and the base, are installed with a gap and are fixed against rotation with the possibility of lateral movement; the coupling connecting the electric motor to the drive shaft is made in the form of an elastic coupling, and the coupling connecting the centrifugal pump to the drive shaft is made of half-couplings with flange sections bearing rigidly mounted fingers located on the same diameter, an elastic disk mounted between the coupling halves made of elastic steel foil bonded in the central zone and having holes in the number of fingers of the coupling half.

Figure 1 shows a longitudinal section of the drive;

figure 2 is a section aa in figure 1;

figure 3 is a section bB in figure 1;

figure 4 is a longitudinal section of a coupling connecting the pump shaft to the drive shaft;

figure 5 is a section bb in figure 4;

in Fig.6 is a section GG in Fig.1.

The drive consists (Fig. 1) of an electric motor 1, a housing 2 mounted on a base 3 connected to an adapter 4, a flexible coupling 5, a ball-bearing assembly 6, a sealing assembly 7, a sliding bearing 8, a drive shaft 9 and a flexible coupling 10.

The sealing unit 7 consists of a removable housing 11 (figure 3), a set of sealing elements 12, placed in a glass 13, mounted in the housing 11 with a gap and thereby having the possibility of free running in the transverse direction. The pins 14 prevent the rotation of the glass 13 relative to the housing 11.

The elastic coupling 10 consists (Figs. 4 and 5) of half-couplings 15 and 16, equipped with fingers 17 located on the same diameter, between which a disk 18 is mounted, assembled from a steel spring foil, not fastened tightly in the central zone, and provided with holes by the number fingers 17 of the coupling halves 15 and 16.

The elastic coupling 5 (figure 2) consists of half-coupling 19 and 20 and located between the elastic fingers 21 and spring 22, pressing the coupling half 20 to the motor 1.

The housing 23 (figure 1) of the sliding bearing 8 relative to the base 3 is installed with a gap and from rotation is fixed by pins 24 (figure 6).

The housing of the ball-bearing assembly 6 and the sealing assembly 7 in the attachment points to the housing 2 and the base 3, respectively, are mounted with the possibility of lateral displacement.

The assembly of the drive is carried out in the following sequence. A housing 23 of a sliding bearing 8 is installed in the base 3, an adapter 4 is attached to it and placed on a stand (not shown in the drawing). The housing 2 is installed on the base 3 and connect them together with bolts. The assembly of the sealing unit 7 and the ball-bearing unit 6 is carried out on the drive shaft 9 located outside the housing 2. At the end of the drive shaft 9, a coupling half 19 is inserted and inserted into the housing 2 with the assembled assemblies, directing its second end into the opening of the plain bearing housing 23. The second coupling half 20 are planted on the end of the shaft of the electric motor 1 and a spring 22 is installed, after which the electric motor 1 is mounted on the housing 2, directing the coupling half 19 into the hole of the coupling half 20. At the same time, elastic fingers 21 are inserted.

The coupling half 16 (Fig. 4) of the coupling 10 is mounted on the pump shaft and the latter is attached to the adapter 4, having previously directed the end of the drive shaft 9 into the hole of the coupling half 15. After that the drive shaft 9 is scrolled and the alignment of the shafts of the motor 1, pump and drive shaft 9 and only after that the ball-bearing assembly 6 and the sealing assembly 7 are rigidly fixed to the housing 2 and the base 3, respectively.

The operation of the drive is as follows.

The torque from the electric motor 1 is transmitted to the coupling half 20 and through the elastic fingers 21 to the coupling half 19, which drives the drive shaft 9. The latter transfers the force to the coupling half 15 and through the fingers 17 acts on the disk 18, which, being in engagement (contact) with the coupling half 16 , transfers force to the pump shaft. If during operation there is a slight radial run-out of the drive shaft 9, it is compensated by connecting elastic couplings 5 and 10 and a set of sealing elements 12 located in the glass 13 of the sealing unit 7.

The technical and economic efficiency of the proposed drive is:

- to increase the operational reliability achieved due to the fact that the alignment of the motor and pump shafts is ensured by the self-alignment of the bearing units and the sealing unit relative to the axis of the drive shaft due to their ability to shift in the transverse direction during installation of the drive, as well as due to the presence in the design of elastic couplings that compensate for the displacement drive shaft relative to the shafts of the pump and electric motor;

- to reduce the complexity of manufacturing parts due to the weakening of technological requirements for this process. In the known device, taken as a prototype, the tolerances on the shaft and body parts where the shaft is installed must be made with very high accuracy, about 5-10 microns, in the proposed device, these figures are an order of magnitude smaller.

Claims (1)

A vertical borehole centrifugal pump drive comprising a drive shaft, a housing, a base, couplings, a ball bearing assembly and a sealing assembly including a housing and sealing elements, a sliding bearing assembly including a housing, and an electric motor, characterized in that the ball bearing assembly is removable and together with the sealing unit is installed with the possibility of displacement perpendicular to the axis of the drive during installation; the sealing unit is provided with a glass in which the sealing elements are placed, the glass of the sealing unit and the bearing housing, respectively, relative to the housing and the base, are installed with a gap and are fixed against rotation with the possibility of lateral movement; the coupling connecting the electric motor to the drive shaft is made in the form of an elastic coupling, and the coupling connecting the centrifugal pump to the drive shaft is made of half-couplings with flange sections bearing rigidly mounted fingers located on the same diameter, an elastic disk mounted between the coupling halves made of elastic steel foil bonded in the central zone and having holes in the number of fingers of the coupling half.

Images