RU2364755C1 - Radial guide vane of multi-stage submersible pump - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention is related to the field of pump engineering and first of all to pumps for oil extraction from wells and for water supply in payout oil-bearing bed for maintenance of reservoir pressure in it. Guide vane 2 consists of cylindrical body 4, upper disk 5, lower disk 6, inserts 7 and cover 8, arranged as separate parts. On internal surface of body 4 there are protrusions 9 with spiral surface, axis of which is parallel to axis of guide vane 2, and flat end. Inserts 7 are installed tightly to flat ends of every protrusion 9 and are fixed in slot seats arranged on peripheral part of upper disk 5 upstream inlet to return channels. Transition channels formed with the help of profiled inclined grooves in external cylindrical surface of insert 7, return channels are connected to spiral outlets on upper disk 5. Bores 12 and 13 are arranged at sides of protrusions 9. Disk 6 is arranged as a whole with bush 17.

EFFECT: reduction of hydraulic losses and provision of efficient pumping of liquid with high gas content.

7 cl, 6 dwg

Description

The invention relates to the field of pump engineering and, above all, to multi-stage pumps used for oil production from wells and for supplying water to a productive oil reservoir to maintain and increase reservoir pressure in it.

It is known to use in the steps of a submersible multistage centrifugal pump a guiding apparatus with blades located between the upper and lower disks forming the flow part of the guiding apparatus (see, for example, V.N. Ivanovsky and other "Equipment for oil and gas production", Moscow: GUL, Oil and Gas Publishing House of the Russian State University of Oil and Gas named after I.M. Gubkin, 2002, part 1, p.356-360, Fig.5.5).

A disadvantage of a stage with a known directing apparatus is the low pressure value due to the fact that when the flow passes from the impeller to the directing apparatus through an annular bezelless chamber, the pumped gas-liquid mixture is stratified, in which the liquid will be pressed against the housing wall and lose a significant part of the energy before as it hits the vanes of the guide vane.

Such a guiding apparatus is relatively simple to manufacture, but stages with such a HA do not pump gas-liquid mixtures well enough.

A number of radial guide vanes are known, in which the design is such that the pumped medium, leaving the impeller, is exposed to guide elements made in the form of guide vanes or ribs, which form guide channels together with the flat surfaces of the disks and the cylindrical surface of the housing, by which the pumped medium passes to the entrance to the impeller of the next stage (RF patent No. 35392 U1 for utility model, publ. 10.01.2004, ed. certificate of the USSR No. 479399, publ. 05.08.1976, patent of the Russian Federation 2142069, publ. 27.11.1999).

In the constructions under consideration there are spiral outputs, diffuser channels, transitional inclined channels and return channels. A similar sequence is typical for large steps. In steps of a smaller size due to the need to reduce the total length of the guide channels in some cases, some of the listed elements are missing.

In one of such guide vanes, the diffuser channel is shortened, and instead of inclined transition channels there are cutouts from the side surface of the lower disk through which the medium can pass from the diffuser channel to the return ones (ed. USSR certificate No. 479399, MKI F04D 29/44, publ. 05.08.1976). In another design of the guide vane, the transitional side channel forms the side ribs of a more complex shape (RF patent No. 35392 U1 for utility model, MKI F04D 29/44, published January 10, 2004), which makes it possible to better organize the transition, however, the shape of such inclined transition channels is imperfect . There are designs of guide vanes in which diffuser channels are completely absent, but there are well-designed inclined transition channels (RF patent No. 2142069, MKI F04D 29/44, publ. 11/27/1999).

A common disadvantage for all of these guide vanes is the difficulty of manufacturing.

The closest technical solution is a radial guide apparatus having a cylindrical body made integrally with the upper disk and the lower disk as a separate part. On the lower, lateral, and upper surfaces of the lower disk, guide vanes are located that form, with the flat surfaces of the upper disks of the given and adjacent steps, as well as with the inner cylindrical surface of the housing, a sequence of guide channels: spiral outlet, diffuser channel, transition channel, and return channel. In this case, recesses are formed on the side surface of the lower disk (see, for example, A. A. Bogdanov, Centrifugal submersible electric pumps for oil production. M: Nedra, 1968, p. 48-49, Fig. 36).

The disadvantage of this guide vane is the rather high complexity of manufacturing the lower disk, especially for small dimensions.

The objective of the invention is to ensure the manufacture of a guide apparatus from a simpler form of parts, providing high pressure and energy characteristics of the stage and efficient operation when pumping gas-liquid mixtures.

The technical result is achieved by the fact that in a radial guide apparatus of a centrifugal multistage pump containing a cylindrical body, upper and lower disks, spiral outlets formed by recesses on the mating surfaces and connected to the return channels by means of transition channels, according to the invention, on the inner surface of the cylindrical body protrusions having a cylindrical surface whose axis is parallel to the axis of the guide apparatus, and a flat end face, the upper disk is made flax in the form of a separate part and is equipped with slotted sockets, and transition channels are formed with recesses in separate inserts installed close to the flat ends of each protrusion on the inner surface of the housing and fixedly mounted in the slotted sockets of the upper disk and in the side recesses of the lower disk with the possibility of formation of continuous guide channels.

The insert can be made in the form of a body bounded by internal and external cylindrical surfaces parallel to the axis of the guide apparatus, two end planes parallel to the axis of the guide apparatus, and two horizontal faces perpendicular to the axis of the guide apparatus, while an inclined shaped recess is formed in the outer cylindrical surface of the insert . In this case, the bottom of the recess in the insert can be formed by a cylindrical surface, the axis of which is parallel to the axis of the guide apparatus, and the walls of the recess can be made in the form of a complex cylindrical surface, which are perpendicular to the axis of the guide apparatus. The surface of the walls may have concave and convex sections of variable curvature, moreover, to ensure a continuous fluid flow, the inlet and outlet sections of the recess can be parallel or directed at a small angle to the horizontal faces of the liner and smoothly interfaced with the intermediate part made oblique. The liner can be made by pressing along an axis parallel to its horizontal face.

An annular cover with spiral protrusions can be installed under the lower disk of the guide vane, and spiral exits are formed by the cylindrical surfaces of the projections of the housing, the inner cylindrical surfaces of the inserts, the surfaces of the side protrusions of the lower disk and the surfaces of the protrusions on the annular cover.

It is preferable to connect the individual parts of the guide apparatus by gluing, soldering, welding or fixing elements.

The essence of the invention is illustrated by the following drawings.

Figure 1 shows a sectional view of the assembly of two stages along a plane passing through the axis of the shaft and intersecting the spiral channel.

Figure 2 - cylindrical housing of the guide apparatus with protrusions, General view from below.

Figure 3 - the upper disk of the guide apparatus, bottom view.

Figure 4 - the lower disk of the guide apparatus, views from below (a) and side view in section (b).

Figure 5 - cover of the guide apparatus, top view.

Figure 6 - liner guide apparatus, a top view (a) and from the recess (b, c).

The pump is recruited from the steps along the shaft 1. Each stage consists of a guide apparatus 2 and the impeller 3.

The guide apparatus 2 consists (Fig. 1) of a cylindrical body 4, an upper disk 5, a lower disk 6, inserts 7 and a cover 8, made in the form of separate parts.

On the inner surface of the housing 4 there are protrusions 9 with a spiral surface 10 and a flat end 11 (figure 2). The spiral surface 10 together with the inner surface of the liner 7 forms the side wall of the spiral outlet.

On the sides of the protrusions 9 in the housing 4 are made lower 12 and upper 13 cylindrical bores.

On the lower surface of the upper disk 5 between the ribs 14 there are return channels 15 (figure 3). On the peripheral part of the disk 5, immediately before the entrance to the return channels 15, slotted sockets 16 are made for accommodating the inserts 7. The depth of the slotted sockets 16 is somewhat greater than the depth of the channels 15.

The lower disk 6 has smooth lower and upper surfaces and is made integrally with the sleeve 17. In the lateral part of the lower disk 6 dihedral recesses 18 are formed, consisting of a long convex side and a short flat one (Fig. 4).

The annular cover 8 on the inside is provided with spiral protrusions 19, the shape of which follows the contour formed by the dihedral recesses 18 of the lower disk 6 (Fig. 5).

The insert 7 (Fig.6) is limited by the inner 20 and outer 21 cylindrical surfaces parallel to the axis of the guide apparatus, two end planes 22 and 23 parallel to the axis of the guide apparatus and two horizontal faces 24 and 25, perpendicular to the axis of the guide apparatus. In the outer cylindrical surface 21, an inclined profiled recess 26 is formed with a cylindrical bottom 27 and walls 28, which may have convex 29 and concave 30 sections. The input 31 and output 32 sections of the recess 26 are parallel or directed at a small angle to its horizontal 24 and 25 faces and smoothly mate with an inclined intermediate part between the convex 29 and concave 30 sections. The shape of the recess 26 allows the insert 7 to be pressed along an axis parallel to its horizontal flat faces 24 and 25.

When assembling the guide apparatus, an upper disk 5 is installed in the upper cylindrical bore 13 of the housing 4 close to the upper side of the protrusions 9, combining the front edge of the slot nest 16 with the surface of the end 11. The inserts 7 are inserted into the slot nests 16, the shape of which corresponds to the shape of the upper horizontal faces 25, moreover, the end plane 23 is tightly pressed against the surface of the end face 11 of one of the protrusions 9, while the outer cylindrical surface 21 of the insert 7 is joined with the spiral surface 10 of the adjacent protrusion 9, the last joint but with three walls of the recess 26 forms a transition channel. After installing the liner 7, its inner surface 20 becomes a continuation of the spiral surface 10 of the protrusion 9, and its lower horizontal face 24 forms a common horizontal surface with the lower side of the protrusion 9. As a result, a figured cavity is formed in which a lower disk 6 is inserted between the protrusions 9 and the inserts 7, which is installed when the sleeve 17 is oriented upwards. In the cavity formed, the lower disk 6 is inserted until it touches the ribs 14 of the upper disk 5. Between the upper disk 5 and the lower disk 6, reverse channels are thus formed, bounded on four sides. Then, against the stop with the lower side of the protrusion 9, an annular cover 8 is inserted, placing the spiral protrusions 19 in the empty spaces between the inserts 7 and the free surface of the protrusions 9 of the housing.

During assembly of the guide vane, the joints of individual parts are smeared with a slip based on the powder mixture from which these parts are made. Due to this, after assembly and sintering, the gaps between the parts of the guide apparatus are sealed and flow parts are obtained, which are channels bounded on four sides (transitional and reverse), which, in comparison with the prototype, eliminates possible leaks.

Guide apparatus operates as follows. The flow of pumped liquid, leaving the impeller 3, enters the spiral outlets on the lower surface of the lower disk 6, then passes through the transition channels in the liners 7 and enters the peripheral part of the return channels 15 of the upper disk 5, closed from the bottom by the upper side of the lower disk 6. Next the fluid moves radially to the central part of the disk 5 and rises through the annular gap around the sleeve 17 to the entrance of the impeller 3 of the next stage.

The proposed design allows to increase the pressure by stabilizing the flow in the tetrahedral channels and preventing overflow of the working fluid between the stages.

The optimal configuration of the transition channels reduces hydraulic losses and ensures the efficient pumping of high gas liquids.

The implementation of the guide apparatus is detachable allows you to use the technology of powder materials science for its manufacture with the involvement of a wide range of materials. In addition, in the event of wear, each of the elements can be replaced separately.

Claims (7)

1. A radial guide apparatus of a centrifugal multistage pump, comprising a cylindrical body, upper and lower disks, spiral outlets formed by recesses on the mating surfaces and connected to the return channels by transition channels, characterized in that on the inner surface of the cylindrical body there are protrusions having a cylindrical surface, the axis of which is parallel to the axis of the guide apparatus, and a flat end face, the upper disk is made as a separate part and equipped with slits nests, and transition channels are formed with recesses in separate inserts installed close to the flat ends of each protrusion on the inner surface of the housing and fixedly mounted in slotted slots of the upper disk and in the side recesses of the lower disk with the possibility of the formation of continuous guide channels. 2. The guiding apparatus according to claim 1, characterized in that the liner is made in the form of a body bounded by inner and outer cylindrical surfaces parallel to the axis of the guiding apparatus, two end planes parallel to the axis of the guiding apparatus and two horizontal faces perpendicular to the axis of the guiding apparatus, this in the outer cylindrical surface of the liner formed by an inclined profiled recess. 3. The guiding apparatus according to claim 1, characterized in that the bottom of the recess in the insert is formed by a cylindrical surface, the axis of which is parallel to the axis of the guiding apparatus, and the walls of the recess are made in the form of curved cylindrical surfaces with concave and convex portions of variable curvature, which are perpendicular to the axis of the guide apparatus, and to ensure a continuous fluid flow, the input and output sections of the recess are parallel or directed at a small angle to the horizontal faces of the liner and are smoothly interfaced with intermediate part made inclined. 4. The guide apparatus according to claim 1, characterized in that the liner is made by pressing along an axis parallel to its horizontal faces. 5. The guide apparatus according to claim 1, characterized in that an annular cover with spiral protrusions is installed under the lower disk. 6. The guiding apparatus according to claim 1, characterized in that the individual parts are connected by gluing, soldering, welding or fixing elements. 7. The guiding apparatus according to claim 1, characterized in that the spiral outlets are formed by the cylindrical surfaces of the protrusions of the housing, the surfaces of the lateral protrusions of the lower disk and the surfaces of the protrusions on the annular cover.

Images