RU2672994C1 - Device for unloading screw submersible pump and its bearing assembly, end seal assembly, safety valve and cam clutch - Google Patents

Device for unloading screw submersible pump and its bearing assembly, end seal assembly, safety valve and cam clutch Download PDF

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Publication number
RU2672994C1
RU2672994C1 RU2017130857A RU2017130857A RU2672994C1 RU 2672994 C1 RU2672994 C1 RU 2672994C1 RU 2017130857 A RU2017130857 A RU 2017130857A RU 2017130857 A RU2017130857 A RU 2017130857A RU 2672994 C1 RU2672994 C1 RU 2672994C1
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Russia
Prior art keywords
drive shaft
housing
assembly
submersible pump
nipple
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RU2017130857A
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Russian (ru)
Inventor
Владимир Борисович Козлов
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Владимир Борисович Козлов
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth

Abstract

FIELD: oil and gas industry.SUBSTANCE: group of inventions relates to the oil industry. In the method, the unloading device of the screw submersible pump contains, in series arranged on drive shaft 14, the upper assembly of the mechanical seals, membrane assembly 11, the bearing unit, the lower unit of the mechanical seals and cam coupling 16 located on shaft 34 of drive of protector with the possibility of providing one-way communication with drive shaft 14. On shaft 14 in the upper and lower parts upper and lower nipples 5 and 15 are respectively arranged. In front of the bearing unit on shaft 14 after upper sliding bearing 10 membrane unit 11 is located. Nipple 5 is equipped with a safety valve assembly.EFFECT: group of inventions is aimed at improving the technical and operational characteristics of the unloading device by reducing the weight and size parameters while increasing the operational reliability and, consequently, the service life.6 cl, 5 dwg

Description

The group of inventions relates to the oil industry, and in particular to devices and unloading units of a submersible pumping unit for oil production equipment, which absorb high axial loads acting on the shaft during the operation of high-speed mechanisms, in particular bearings.

A support assembly is known from the prior art, which comprises a housing, a shaft located in radial bearings and at least two support sections arranged along with the shaft axis and made with elastic elements, each of the support sections comprising a stop fixed to the shaft interaction with the support associated with the housing (US patent No. 4,856,914, IPC F16C 17/06, 08/15/1989).

A disadvantage of the known device is relatively large dimensions with low reliability of the functioning of the support node

The support assembly according to the patent RU No. 2235226 C2, IPC 7 F16C 17/26, publ. 2002, comprising a housing, a shaft located along the axis of the shaft, at least two support sections, each of which contains an elastic element, a support fixed to the shaft and a support fixed in the housing, grooves made on the end surfaces of the support of each support section, in one of which, made from the outer end surface of the abutment, has an elastic element mounted on the shaft using a thrust ring with locking segments located in the shaft groove, and in the annular groove made on the inner end th surface of the stop, an antifriction ring in contact with the antifriction ring is fixed. A disadvantage of the known solution lies in the fact that fixing on the support of the holder with one part of the rolling bearing and making their contact surfaces spherical, reduce the reliability of the support and complicate the process of assembly and fitting of compensators.

Along with these drawbacks, the known solution has advantages, which in the first place include increased load capacity due to the uniform distribution of load between the supporting elements, as well as the relative simplicity of design, the known design has a complex process of installing and adjusting bearings.

The technical problem of the invention is the development of a device for discharging a screw submersible pump with improved technical and operational characteristics due to a decrease in weight and size parameters while improving operational reliability and, consequently, the service life.

The specified technical result is achieved due to the fact that the discharge device of the screw submersible pump contains two nipples - the upper 5 and lower 15, supported by sliding bearings 10 on the drive shaft 14, mounted in the bearing assembly, in front of which on the drive shaft 14 after the upper sliding bearing 10 there is a membrane unit 11, which serves to protect against excessive pressure, on the upper and lower ends of the drive shaft 14 between the last and respectively upper and lower nipples 5 and 15 are located torus blocks seal, while the nipple 5 is equipped with a safety valve assembly 8, 9 for communicating the internal space of the unloading unit with the external environment, and the lower end of the drive shaft 14 is connected to the intermediate shaft connected to the tread by a cam clutch 16, while the upper nipple is external the side is connected to the suction pipe 1 and the housing of the membrane unit 11, which serves as a support for the housing of the bearing assembly, which in turn is connected to the lower nipple 15, the lower part of which is attached to the cylindrical core usu disposed therein with the bottom block end seals 6, 7 and the cam sleeve 16, the free end of the cylindrical housing is connected to the support member for attaching a protector.

The prior art also known device bearing assembly according to the patent of the Russian Federation 77003, publ. 10.10.2008, comprising a housing, inside of which a drive shaft is located, at least two supporting sections in series, each of which contains a stop located in series with the shaft, an axial rolling bearing, an axially movable support and an elastic element, pressed against the support by an adjusting nut connected to the housing by means of a threaded connection and fixed with an adhesive, one part of the thrust roller bearing is connected to the support, and the other part to the stop, wherein the support sections are directly located on the drive shaft or through a hollow sleeve connected to the drive shaft with the possibility of transmitting torque.

Negative is the high complexity of technological maintenance, and, as a consequence, not high operational reliability.

The claims are made without taking into account the closest analogue.

The technical problem of the invention is to eliminate these drawbacks, as well as increasing bearing capacity, reducing axial dimensions by ensuring the operation of each bearing, regardless of adjacent bearings

To solve a technical problem and achieve a technical result, the bearing assembly of the discharging pump of a screw submersible pump according to claim 1 contains a housing 13, inside of which an emphasis 19 is fixedly mounted on the drive shaft 14 with half rings 20 and a key 21, with the stop 19 supported on one side thrust tapered roller bearings 22, and on the other hand, said bearing is supported through a washer 23 and a disk spring 24 against a stop 25 fixedly mounted in the housing 13, while the first stop 19 is limited in axial movement board by means of a lock ring 27, and the remaining washers 23 - secured against rotation.

It is advisable to perform a bearing assembly with a stop 19 fixedly mounted in the housing 13 by means of a thread and a locked locking screw 26, while screws 13 are mounted in the housing 13 to lock the washers 23.

The prior art various seals of the discharge devices of a screw submersible pump, however, the closest analogue has not been identified, therefore, the formula is made without taking it into account.

As the closest analogue, the invention according to patent RU No. 2235226, publ. 2002. The disadvantages of the known solutions include insufficient operational reliability, especially in difficult operating conditions.

The technical problem of the invention is the elimination of these drawbacks and the development of the mechanical seal assembly for the discharge device of a screw submersible pump with increased operational reliability by ensuring the separation of functions of each seal in such a way that when one of the mechanical seals fails, the second, due to the snap ring 33, retains its performance.

To solve the technical problem and achieve the technical result, the mechanical seal assembly of the screw submersible pump unloading device according to claim 1 is made of a sleeve with a shoulder, two fixed rings 28, one of which is supported in the shoulder of the said sleeve, and the other in the upper nipple, while between fixed rings 28 are two groups of mechanical seals 6, 7, made in the form of sequentially arranged movable ring 29, mechanical seal in the form of an elastic bellows 31 with a spring 30, adjusting rings 32 and one hundred ornogo ring 33 disposed between the shims 32.

As the closest analogue to the safety unit for the discharge device of a screw submersible pump, patent RU No. 2235226 C2, IPC 7 F16C 17/26, publ. 2002.

The technical problem of the invention and the technical result achieved is to increase the compactness both in the transverse and axial while increasing the operational reliability of the node.

To solve a technical problem and achieve a technical result, the safety valve assembly of the screw submersible pump discharge device according to claim 1, is made in the form of two channels communicated with each other, located in the transverse plane of the upper nipple 5, at least at least one of the channels is arranged in series two check valves, and the other channel is in communication with a groove made inside the nipples, open towards the drive shaft.

The prior art various solutions of safety couplings, for example, according to the patent of the Russian Federation 75867, publ. 08/27/2008 the construction of a safety clutch of a submersible pump installation is known, comprising a housing with two half-couplings, spring-loaded relative to the housing and pressed against each other with the possibility of contacting the working end surfaces, on which the teeth are evenly spaced around the circumference, with the possibility of transmitting rotation in one direction corresponding to rotation the pump shaft, while the coupling halves are mounted on the ends of the pump and tread shafts and connected to them by means of splined joints.

However, from the prior art the closest analogue has not been identified, therefore, the formula is drawn up without taking it into account.

The technical problem of the invention is to increase operational reliability, while simplifying the design.

To solve a technical problem and achieve a technical result, the cam clutch of the discharging pump of a screw submersible pump according to claim 1 is single-acting and contains a housing connected to the drive shaft, inside of which two cams spring-loaded relative to this shaft are rotatably located on the tread drive shaft in the transverse plane contacting the inner surface of the cam clutch housing.

The indicated features for each independent claim are essential and interconnected causally with the formation of a set of essential features according to the first claim necessary to solve the problem and sufficient to achieve a technical result, namely to improve the technical and operational characteristics of the screw submersible unloading device pump by reducing the mass-overall parameters and increasing operational reliability.

The invention is illustrated by drawings, where:

in FIG. 1 is a longitudinal section through a discharge device of a screw submersible pump, depicted in two parallel parts;

in FIG. 2 is a section BB of FIG. one;

in FIG. 3 is a section AA in FIG. one;

in FIG. 4 is a longitudinal section of a bearing assembly of a discharge device of a screw submersible pump;

in FIG. 5 - the mechanical seal assembly of the discharge device of a screw submersible pump.

The invention is illustrated by a specific example of the discharge device of a screw submersible pump, which, however, is not the only possible, but clearly demonstrates the possibility of achieving this set of essential features of a given technical result.

In the drawings of the discharge device of a screw submersible pump, the structural elements have the following positions:

Pos. 1 - suction pipe with adapter 2;

Pos. 2 - adapter;

Pos. 3 - flexible shaft with spline pump sleeve 4;

Pos. 4 - spline pump sleeve designed to provide communication with the pump (not shown in the drawings);

Pos. 5 - upper nipple with mechanical seals 6 and 7 located in it, made double;

Pos. 6, 7 - mechanical seals;

Pos. 8, 9 - sequentially located check valves of the safety valve assembly;

Pos. 10 - sliding bearing mounted in the upper and lower nipples and on the drive shaft;

Pos. 11 - membrane unit, designed to perform a safety function in the event of peak loads in the pressure of the working medium.

Pos. 12 - membrane membrane unit, which on the one hand is connected with the upper nipple 5, and on the other hand, with the body of the membrane unit 11;

Pos. 13 is a housing, in the form of a pipe, a bearing assembly is located inside the housing, at the input of which a membrane assembly is located, which serves to absorb axial load during operation of a screw pump (not shown in the drawings) through a shaft 14, while a mechanical seal assembly is located in front of the membrane assembly 11 6, 7.

Pos. 14 - a power shaft;

Pos. 15 - lower nipple associated with the bearing assembly, and in which there is another assembly of mechanical seals 6 and 7, as well as a plain bearing 10 of the drive shaft 14;

Pos. 16 - cam clutch for providing one-way coupling of the drive shaft 14 with the protector drive shaft 34 with the possibility of preventing reverse rotation and, as a result, maintaining the operability of the screw pump in the wrong (reverse) direction of rotation of the engine (emergency), but due to the cam clutch, the pump is destroyed not happening.

Pos. 17 - a support element for connecting the device to the tread (not shown in the drawings);

Pos. 18 - spline coupling mounted on the rear splined part of the shaft 34 of the tread drive to ensure interaction with the tread;

Pos. 19 - stops, "fixed" on the shaft 14 using half rings 20 and dowels 21, while the stops 19 are installed with the possibility of interaction with the corresponding bearing 22;

Pos. 20 - half rings to limit the axial movement of the stops 19;

Pos. 21 - dowel to ensure "fixed fastening" of the stops 19 on the drive shaft 14;

Pos. 22 - persistent tapered roller bearings, which are supported on one side by stops 19, and on the other hand by a housing 13 by means of a washer 23, a disk spring 24 and a stop 25 fixedly mounted in the housing 13;

Pos. 23 - a washer located on the drive shaft 14 with the possibility of limited axial movement and is fixed from rotation relative to the housing 13 by any known means, for example a screw;

Pos. 24 - Belleville spring, providing elastic pressing of the bearing to the stop 19 relative to the housing 13;

Pos. 25 - emphasis for a Belleville spring 24, fixed relative to the housing 13;

Pos. 26 - latch for the stop 25, made, for example, screw;

Pos. 27 - stopper in the form of a split ring mounted in the annular groove of the drive shaft 14 for fixing in the axial direction of the stop 19;

Pos. 28 - fixed rings, one of which is supported in the collar of the sleeve 28, and the other in the upper or lower nipple 5, 15;

Pos. 29 - a sleeve with a shoulder on the end;

Pos. 30 - spring bellows 31 mechanical seal;

Pos. 31 - bellows mechanical seal;

Pos. 32 - adjusting rings;

Pos. 33 - a lock ring;

Pos. 34 - tread drive shaft;

Pos. 35 - cam, spring-loaded in the direction of the housing 37;

Pos. 36 - the spring through the pusher is connected with the cam 35;

Pos. 37 - the cam clutch housing by means of a spline connection is connected to the drive shaft 14, while said cams 35 in an amount of two are located on the shaft 34 symmetrically and spring-loaded relative to this shaft 34 in the direction of the housing 37.

The group of inventions is illustrated by a specific example of implementation, which, however, is not the only possible one, but clearly demonstrates the possibility of achieving this set of essential features of a technical result regarding the expansion of technical capabilities by improving technical and operational characteristics.

According to the invention (Fig. 1, 2, 3), the discharging device of a screw submersible pump comprises an upper mechanical seal assembly, a membrane assembly, a bearing assembly, a lower mechanical seal assembly and a cam clutch 16, which is located on the shaft, successively arranged in a vertical direction on the drive shaft 14 34 tread drive with the possibility of providing one-way communication with the drive shaft 14.

On the drive shaft 14 in its upper and lower parts are located the upper 5 and lower 15 nipples, supported by bearings 10 on the drive shaft 14 mounted in the bearing assembly.

After the upper sliding bearing 10, a diaphragm assembly 11 is located on the drive shaft 14, which serves to protect against excessive pressure, and mechanical seal assemblies are located on the upper and lower ends of the drive shaft 14 between the last and upper and lower nipples 5 and 15 respectively.

The upper nipple 5 is equipped with a safety valve assembly 8, 9 for communicating the internal space of the unloading unit with the external environment.

The safety unit is made in the form of two channels connected to each other located in the transverse plane of the upper nipple 5, at least two check valves 8, 9 are arranged in series in one of the channels, and the other channel is in communication with a groove made inside the nipple, open towards the drive shaft 14.

This solution improved the compactness of the node, both in the transverse and axial directions, and also increased its reliability. It became possible to make a groove not in the form of a longitudinal hole, but in the form of a groove, and valves 8 and 9 should be arranged perpendicular to the longitudinal axis of the shaft 14 of the said assembly.

Thus, instead of the longitudinal holes previously made in the upper nipple 5 by drilling, the hydraulic channels are formed by longitudinal grooves made by milling.

In the lower part, the drive shaft 14 is connected to the tread drive shaft 34 by means of a cam clutch 16.

In order to prevent reverse rotation and, as a consequence of this, maintaining the operability of the screw pump in the wrong direction of rotation of the engine (an emergency, but thanks to the coupling does not destroy the pump), the cam clutch 16 is single-acting and contains a housing 37 connected to the drive shaft 14, inside which on the shaft 34 of the tread drive in the transverse plane pivotally located two cams 35, spring-loaded relative to this shaft 34 with the possibility of contact with the inner surface th housing 37 of the dog clutch. The presence of the coupling has increased operational reliability by minimizing the number of parts to perform its function.

The upper nipple 5 is externally connected to the suction pipe 1 and the housing of the membrane assembly 11, which serves as a support for the housing 13 of the bearing assembly, which in turn is connected to the lower nipple 15, the lower part of which is connected to the cylindrical housing with the lower assembly of mechanical seals located in it 6, 7 and the cam clutch 16, and the free end of the cylindrical body is connected to the supporting element 17 for communication with the tread.

According to the invention, in order to improve technical and operational characteristics by reducing the weight and size parameters while increasing operational reliability and, as a result, the life of the bearing assembly includes a housing 13, inside which stops 19 are mounted on the drive shaft 14 using half rings 20 and dowels 21, moreover, on the stop 19, on the one hand, thrust tapered roller bearings 22 are supported, and on the other hand, said bearing is supported through the washer 23 and the cup spring 24 on the stop 25, fixedly fixed nny in the housing 13, the first stop 19 is restricted to move in the axial direction by means of a lock ring 27, and the remaining washers 23 - secured against rotation.

In order to ensure compactness, the stop 19 is fixedly mounted in the housing 13 by means of a thread and is locked by a latch 26 made in the form of a locking screw, and the said washers 23 are fixed with screws installed in the housing 13.

According to the invention, the mechanical seal assembly is made in the form of a collar with a shoulder, two fixed rings 28, one of which is supported in the collar of the said sleeve and the other in the upper nipple. Moreover, between the stationary rings 28 there are two groups of mechanical seals 6, 7, made in the form of sequentially arranged movable ring 29, mechanical seal in the form of an elastic bellows 31 with a spring 30, adjusting rings 32 and one retaining ring 33 located between the adjusting rings 32. This solution is aimed at increasing operational reliability by providing separate functions for each seal. If one of the mechanical seals fails, the second, thanks to the retaining ring 33, remains operational.

Claims (6)

1. A device for discharging a screw submersible pump, comprising an upper end seal assembly, a diaphragm assembly, a bearing assembly, a lower end seal assembly, and a cam clutch 16 disposed on the tread drive shaft 34 sequentially disposed on the drive shaft 14, to provide one-way communication with the drive shaft 14 on which the upper 5 and lower 15 nipples are located in the upper and lower parts, supported by sliding bearings 10 on a drive shaft 14 mounted in a bearing assembly in front of which on the drive shaft 14 after the upper plain bearing 10 there is a membrane assembly 11 that serves to protect against excessive pressure, mechanical seal assemblies are located on the upper and lower ends of the drive shaft 14, while the upper nipple 5 is equipped with a safety valve assembly 8, 9 for messages of the internal space of the unloading unit with the external environment, and the lower end of the drive shaft 14 is connected to the intermediate shaft connected to the tread by means of a cam clutch 16, while the upper nipple with an external the sides are connected to the suction pipe 1 and the housing of the membrane assembly 11, which serves as a support for the housing of the bearing assembly, which, in turn, is connected to the lower nipple 15, the lower part of which is connected to the cylindrical housing with the lower block of mechanical seals 6, 7 located in it and a cam clutch 16, wherein the free end of the cylindrical body is connected to a support member for attaching a tread.
2. The bearing assembly of the discharging device of a screw submersible pump according to claim 1, comprising a housing 13, inside which stops 19 are mounted on the drive shaft 14 with half rings 20 and keys 21, with thrust tapered roller bearings 22 supported on one side and on the other hand, said bearing is supported through a washer 23 and a disk spring 24 against an emphasis 25 fixedly mounted in the housing 13, while the first emphasis 19 is limited in axial movement by means of a locking ring 27, and the remaining washers 23 are fixed against rotation that one.
3. The bearing assembly according to claim 2, characterized in that the stop 19 is fixedly mounted in the housing 13 by means of a thread and locked by a latch 26 made in the form of a locking screw, and the said washers 23 are fixed with screws installed in the housing 13.
4. The mechanical seal assembly of the screw submersible pump unloading device according to claim 1 consists of a sleeve with a shoulder, two fixed rings 28, one of which is supported in the shoulder of the said sleeve, and the other is in the upper nipple, while there are two groups between the fixed rings 28 mechanical seals 6, 7, made in the form of a series of movable rings 29, mechanical seals in the form of an elastic bellows 31 with a spring 30, the adjusting rings 32 and one retaining ring 33 located between the adjusting rings 32.
5. The safety node of the valves of the discharging device of a screw submersible pump according to claim 1 is made in the form of two channels communicated with each other, located in the transverse plane of the upper nipple 5, at least two check valves 8, 9 and the other in series are arranged in series the channel is in communication with a groove made inside the nipple, open towards the drive shaft 14.
6. The cam clutch of the screw submersible pump unloading device according to claim 1 is single-acting and contains a housing connected to the drive shaft, inside which two cams are rotatably located on the tread drive shaft in the transverse plane, spring-loaded relative to this shaft with the possibility of contacting with the inner surface of the cam housing couplings.
RU2017130857A 2017-08-31 2017-08-31 Device for unloading screw submersible pump and its bearing assembly, end seal assembly, safety valve and cam clutch RU2672994C1 (en)

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RU2017130857A RU2672994C1 (en) 2017-08-31 2017-08-31 Device for unloading screw submersible pump and its bearing assembly, end seal assembly, safety valve and cam clutch

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RU2017130857A RU2672994C1 (en) 2017-08-31 2017-08-31 Device for unloading screw submersible pump and its bearing assembly, end seal assembly, safety valve and cam clutch

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110388379A (en) * 2019-08-09 2019-10-29 沈阳工业大学 Bearing arrangement, axle construction and replace screwrod pump
RU197906U1 (en) * 2020-03-06 2020-06-04 Александр Михайлович Погудин Screw submersible pump unloading device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5697768A (en) * 1996-03-01 1997-12-16 Kuda Industries, Inc. Downhole swivel
RU46317U1 (en) * 2005-03-28 2005-06-27 Открытое Акционерное Общество "Алнас" Unloading unit for submersible screw pumps
RU2290539C2 (en) * 2005-02-24 2006-12-27 Открытое Акционерное Общество "Алнас" Submersible screw pump relief unit
DE10258666B4 (en) * 2002-12-13 2007-10-18 Netzsch Oilfield Products Gmbh Submersible pump device for use in a borehole
RU122454U1 (en) * 2012-02-21 2012-11-27 Открытое акционерное общество ОАО "АЛНАС" Submersible low-current pump-free pump unit for producing plastic liquid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5697768A (en) * 1996-03-01 1997-12-16 Kuda Industries, Inc. Downhole swivel
DE10258666B4 (en) * 2002-12-13 2007-10-18 Netzsch Oilfield Products Gmbh Submersible pump device for use in a borehole
RU2290539C2 (en) * 2005-02-24 2006-12-27 Открытое Акционерное Общество "Алнас" Submersible screw pump relief unit
RU46317U1 (en) * 2005-03-28 2005-06-27 Открытое Акционерное Общество "Алнас" Unloading unit for submersible screw pumps
RU122454U1 (en) * 2012-02-21 2012-11-27 Открытое акционерное общество ОАО "АЛНАС" Submersible low-current pump-free pump unit for producing plastic liquid

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110388379A (en) * 2019-08-09 2019-10-29 沈阳工业大学 Bearing arrangement, axle construction and replace screwrod pump
CN110388379B (en) * 2019-08-09 2020-08-28 沈阳工业大学 Bearing structure, shaft structure and submersible screw pump
RU197906U1 (en) * 2020-03-06 2020-06-04 Александр Михайлович Погудин Screw submersible pump unloading device

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Effective date: 20190901

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Effective date: 20200513