RU117537U1 - SUBMERSIBLE CENTRIFUGAL PUMP FILTER INPUT MODULE - Google Patents

Abstract

1. Input filtration module of a submersible centrifugal pump, including a housing with holes for the passage of formation fluid, a base and a head connected to the housing from the bottom and top, respectively, a shaft that transfers rotation from the electric motor to the pump, a filter fixed to the housing, upper, lower and intermediate bearings with spacer perforated pipes installed between the bearings, consisting of bearing housings with longitudinal holes and internal antifriction liners and bumpers fixing the liners on the shaft and in the corresponding bearing housings, characterized in that internal annular grooves are made in the bearing housings at the ends, into which bumpers are inserted with the possibility of limited longitudinal movement and with a gap around the perimeter not exceeding 0.5 mm, and on the shaft above and below the installation site of the anti-friction liners, external annular recesses are made for removable annular spring stops, between which accommodate the lower baffle for the upper bearing or the upper and lower bumpers for the remaining bearings, anti-friction bushings and stacked bushings for fixing on the shaft in the respective bearing housings. ! 2. The input module according to claim 1, characterized in that the length of the antifriction bushings is made 2 ÷ 7 mm longer than the length of the seat for the antifriction bushings.

Description

The utility model relates to petroleum engineering and can be used to clean from mechanical impurities of well fluid at the inlet to a submersible electric centrifugal pump (ESP).

A well-known input module of a submersible pump unit with a slotted filter, consisting of a head with an upper bearing, a base with a lower bearing, a cylindrical housing connected with holes with holes, inside which intermediate bearings are installed, and a slotted filter element is installed from the outside, and a shaft installed in the bearings, moreover, the cavity formed between the cylindrical body and the slotted filter element is connected to the exit from the module by means of channels made in the head, while in the threaded pipes and intermediate bearing housings provided with radial openings for supplying fluid for cooling and lubricating the bearings (PM patent RU №107295, F04D 13/10, publ. 19.01.2011).

The disadvantages of this module is the rapid wear of bearings due to the practical absence of fluid flow around the interaction areas of the shaft and the intermediate bearings, which impairs their cooling and leads to the accumulation of abrasion products of these bearings and abrasive particles (up to 0.5 mm) remaining in the liquid after filtration , which are constantly in this zone, and due to the lack of fixing the shaft in the longitudinal direction (axial movement of the shaft during operation reaches 20 mm), which significantly increases in conjunction with the radial m beating shaft damaging the load on the bearings.

An input module of a submersible centrifugal pump is also known, comprising a housing with holes for the passage of formation fluid, a base and a head attached to the housing, a shaft with intermediate bearings, a self-cleaning multi-section filter mounted on the housing, a dispersing device, while the lower part of the internal cavity of the input module is located screw mounted on the shaft (patent PM RU No. 97778, F04D 13/10, publ. 09/20/2010).

The disadvantages of this module are the high cost and complexity of manufacture due to the costly and difficult to assemble dispersing devices, as well as the rapid wear of bearings due to the large flow of fluid with abrasive particles in the areas of interaction of the shaft and bearings, and due to the lack of fixing of the shaft in the longitudinal direction, all this together with the radial runout of the shaft leads to abrasion of these bearings.

The closest is the input module of fine filtration, designed for installation at the inlet of submersible centrifugal electric pumps for oil production and containing a housing with holes for the passage of formation fluid, a base and a head attached to the housing, a shaft transmitting rotation from the electric motor to the pump, a multi-section slotted frame a wire filter mounted on the housing, a dispersing device in the form of a screw, built into the housing of the input module, while the module is equipped with a safety valve with Dinner actuator opening when clogged filter elements, and the hub of the screw dispersant is elongated and serves simultaneously as shaft protection sleeve (PM patent RU №109512, F04D 13/10, publ. 20.10.2011).

The disadvantages of this module are the high cost and complexity of manufacturing due to the expensive and difficult to assemble dispersing device (screw) and safety valves, as well as the rapid wear of bearings due to the large flow of fluid with abrasive particles in the areas of interaction of the shaft and bearings, which Together with the radial runout of the shaft, these bearings wear out.

The technical task of the utility model is to create a reliable, simple and cheap design of the input module of a submersible centrifugal pump with an increased bearing life.

The technical problem is solved by the input filtration module of a submersible centrifugal pump, including a housing with holes for the passage of formation fluid, a base and a head attached to the housing from below and from above, a shaft transmitting rotation from the electric motor to the pump, a filter mounted on the housing, an upper fixed to the shaft, lower and intermediate bearings with spacer perforated nozzles installed between bearings, consisting of bearing housings with longitudinal holes and internal anti-friction liners and chippers fixing the liners on the shaft and in the respective bearing housings.

New is that in the bearing housings at the ends there are internal annular grooves, into which bumpers are inserted with the possibility of limited longitudinal movement and with a perimeter gap not exceeding 0.5 mm, and on the shaft above and below the installation site of antifriction liners, outer annular grooves are made selections for removable annular spring stops, between which are located the lower bump for the upper bearing or the upper and lower bumps for the remaining bearings, antifriction liners and collapsible bushings for fixing on the shaft and corresponding bearing housings.

Also new is the fact that the length of the antifriction liners is 2-7 mm longer than the length between the seat for the antifriction liners of the bearings.

Figure 1 shows the input module in longitudinal section: a - the upper part, b - the lower part.

Figure 2 shows the upper bearing.

Figure 3 shows the intermediate or lower bearing. The input filtration module of a submersible centrifugal pump, housing 1 (Fig. 1) with openings 2 for the passage of formation fluid, attached to the housing 1, respectively, from the bottom and top, base 3 and head 4, shaft 5, transmitting rotation from an electric motor (not shown in Fig. 1) attached to the bottom of the pump (not shown in Fig. 1), attached to the top, a filter 6 mounted on the housing 1, fixed on the shaft top 7, bottom 8 and intermediate 9 bearings with spacer perforated nozzles 10 mounted between bearings 7, 8 or 9, consisting from bearings 11 (figure 2) or 12 (figure 3) of bearings 7 (figure 2), 8 (figure 3) or 9 with longitudinal holes 13 (figures 2 and 3) and internal anti-friction liners 14 and lower 15 and the upper 16 (FIG. 3) of the chippers fixing the liners 14 (FIGS. 2 and 3) on the shaft 5 and in the respective housings 11 (FIG. 2) or 12 (FIG. 3) of the bearings 7 (FIG. 2) or 8 (figure 3). In the housing 11 (figure 2) or 12 (figure 3) of the bearings 7 (figure 2), 8 (figure 3) or 9 at the end of the housing 11 (figure 2) of the upper bearing 7 is made lower 17, and at the ends buildings 12 (figure 3) additionally and the upper 18, the inner annular grooves into which the lower 15 (figure 2 and 3) and the upper 16 (figure 3) chippers are inserted with the possibility of limited longitudinal movement and with a gap around the perimeter, not exceeding 0.5 mm (a <0.5), and on the shaft 5 (FIGS. 2 and 3) above and below the installation site of the anti-friction liners 14, the upper 19 and lower 20 outer ring samples are made to match removable upper 21 lower and 22 ring spring ring stops, between which are placed the lower bump 15 (figure 2) for the upper bearing 7 or upper 15 (figure 3) and the lower 16 bump for the remaining bearings 8 and 9, antifriction liners 14 ( 2 and 3) and collapsible bushings 23 for fixing on the shaft 5 and the corresponding housings 11 (figure 2) or 12 (figure 3).

The assembly of the input module is carried out in the following sequence.

The head 4 is connected to the housing 11 (figure 2) of the upper bearing 7 (for example: using thread 24 - figure 1). On the shaft 5 (FIG. 2), an emphasis 22 is inserted into the lower groove 20, on which they rest, sequentially putting on the shaft 5, the collapsible bushings 23 the lower bump 15 of the insert 14 of the upper bearing 7 and the collapsible bushings 23, all this is fixed by the upper stop 21, inserted into the groove 19. The collapsible bushings 23 at the top and bottom of the liner 14 and the chipper 15 are selected so as to ensure the necessary outreach of the shaft 5 above the upper bearing 7 and securely fix all elements 14, 15 and 23 on the shaft 5. Shaft 5 with elements 14, 15 and 23 are inserted into the housing 11 of the upper bearing 7, and then into the upper prot point 19 (Fig. 3) for the intermediate bearing 8, next from the upper bearing 7 (Fig. 2), (Fig. 3), an emphasis 21 is inserted on which they abut, dressing sequentially on the shaft 5, the upper chipper 16 and the insert 14 of the intermediate bearing 8. After whereupon a spacer pipe 10 is put on the shaft 5, lengthwise adjusted in place, up to the stop in the housing 11 (FIG. 2) of the upper bearing 7 and the housing 12 (FIG. 3) until interacting with the pipe 10, then the lower bump 15 of the intermediate bearing 8 is installed, collapsible bushings 23 and all this is fixed with a lower stop 22 inserted into the groove 20. On The bottom sleeves 23 from the bottom of the bump stop 15 are selected so that all the elements 14, 15, 16 and 23 are firmly fixed on the shaft 5 by the stops 21 and 22. Consequently, the remaining intermediate bearings 8 are also assembled from the upper bearing 7 (FIG. 2) (FIG. 3) and the lower bearing 9. The bushings 23 (FIGS. 2 and 3) are all of the same type, which simplifies their manufacture, and for fitting to each place one of them is pumped to the desired size, later when repairing and replacing the liners 14 with new ones, it is enough to replace only a machined non-metal-consuming and cheap bushing 23, and the rest are used standard, which saves material costs. Then, on bearings 7 (Fig. 1), 8 and 9 with spacer tubes 10, a pre-assembled housing 1 with a filter 6 is put on the bottom, followed by connection (for example: thread 24) of the housing 1 with head 4 and base 3 (for example: along thread 25 ), pressing and securely fixing the filter 6 on the housing 1 and bearings 7, 8 and 9 with spacers 10 in the housing 1. For centering and installing on the housing 1 of the filter 6, it can be equipped with process rings 26 and 27. To seal the joints, apply o-rings 28, 29 and 30, and threads 24 and 25 are lubricated before assembly sealant (for example: UNIGERM 6 ... 9 TU 6-01-1362-86 or similar against a lapel). Recommended tightening torque for threads 24 and 25 is 800 ÷ 1000 Nm. It is recommended that the turning moment of the shaft 5 after assembly of the output module should not exceed 7 N · m.

If you make anti-friction liners 14 longer by 2 ÷ 7 mm than the seats for anti-friction liners 14 of bearings 7 (Fig. 2), 8 (Fig. 3) or 9, which simplifies the assembly of bearings 7 (Fig. 2), 8 ( figure 3) or 9 on the shaft 5, since the manufacturing errors of the shaft 5, the housings 11 (figure 2) and 12 (figure 3) and the spacer tubes 10 are leveled, and also the thermal expansions are eliminated during the operation of the input module and the axial shock damped load of structural elements of the input module. Seats are defined as anti-friction liners 14 as the distance between the inner ends of the annular grooves 17 (Fig. 3) and 18 bodies 12 of the intermediate 8 or lower 9 bearings, or as the distance between the upper end (Fig. 2) of the interaction between the antifriction liner 14 and the inner end lower annular groove 17 of the housing 11 of the upper bearing 7.

The input module operates as follows.

Using the base 3, the input module assembly is connected to the electric motor, and using the lower splines 31, the shaft 5 is connected to the shaft (not shown in FIG. 1) of the electric motor. Then, through the head 4, the input module is connected to the pump, using the upper splines 32, the shaft 5 is connected to the pump shaft (not shown in FIG. 1). After that, the ESP assembly on the lift column with a cable (not shown in FIG. 1) is lowered into the well (not shown in FIG. 1) in the installation interval. Voltage is applied through the cable to rotate the motor shaft, which is transmitted through the shaft 5 to the pump shaft, as a result, the borehole fluid passing through the filter 6, openings 2 of the housing 1, perforation 33 of the spacer tubes 10, longitudinal holes 13 (FIGS. 2 and 3) the purified form enters the pump inlet, and then rises to the surface along the elevator column. During operation, part of the liquid, walking through the gaps a between the lower annular groove 17 and the lower chipper 15, cools and lubricates the antifriction tabs 14 and exits through the gap a (Fig. 3) between the upper annular groove 18 and the upper chipper 15 or between the bushings 23 (Fig. .2) and the inner surface of the housing 11. In this case, the gap a (Figs. 2 and 3) not exceeding 0.5 mm is a natural filter from most of the abrasive particles remaining in the liquid and does not pass a large amount of liquid with the abrasive hours remaining after passing through the gap a ments, and limited (no more than 7 mm), the longitudinal movement of the shaft 5 in the housing 11 (Figure 2) and 12 (3) reduces the total speed of the shaft surface 5 (Figures 2 and 3) relative to the inserts 14 antifriktsionnyh.

Bench tests showed that the proposed input module has an overhaul life of 1.2 ÷ 1.6 times the resource of the closest analogue, due to the more durable bearings 7 (Fig. 1), 8 and 9.

The proposed design of the input module of a submersible centrifugal pump is a more reliable, simple and cheap design due to the increased service life of the bearings.

Claims (2)

1. The input filtration module of a submersible centrifugal pump, including a housing with holes for the passage of formation fluid, a base and a head attached to the housing from below and above, a shaft transmitting rotation from the electric motor to the pump, a filter mounted on the housing, upper and lower fixed to the shaft and intermediate bearings with spacer perforated nozzles installed between bearings, consisting of bearing housings with longitudinal holes and internal anti-friction liners and bumpers, fixing the liners on the shaft and in the respective bearing housings, characterized in that in the bearing housings at the ends there are internal annular grooves into which the bumpers are inserted with the possibility of limited longitudinal movement and with a perimeter gap not exceeding 0.5 mm, and On the shaft above and below the installation site of the antifriction liners, outer ring samples are made for removable annular spring stops, between which there is a lower bump for the upper bearing or upper and lower s chippers for other bearings, antifriction inserts and patterned sleeve for fixing the shaft in the respective bearing housings. 2. The input module according to claim 1, characterized in that the length of the antifriction liners is 2-7 mm longer than the length of the seat for the antifriction liners of the bearings.