EP3906365A1

EP3906365A1 - Electric submersible vibration pump

Info

Publication number: EP3906365A1
Application number: EP19924775.0A
Authority: EP
Inventors: Andrey Yurievich YAZYKOV
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-19
Filing date: 2019-11-06
Publication date: 2021-11-10
Also published as: WO2020214056A1; EP3906365A4; EA202100190A1

Abstract

Electric vibration pump has an electromagnet (1), consisting of a core (15) and a winding (16), a vibrator with an armature (2) and a rod (3), and a pump with a housing (11) and a piston (8), while the armature (2) of the vibrator is connected with the core (15) of the electromagnet (1) on one side and with the rod (3) on the other side, on which a shock absorber (4) is fixed, a diaphragm (6) is mounted and a pump piston (8) is set, located in the operating chamber (33) of the pump housing (11). The pump housing (11) is made with channels (30, 31) for connecting the operating chamber (33) to the discharge cavity (32) of the pump, equipped with a built-in check valve (9) and with arc-shaped filtering meshes (12) covering the pump housing (11) along the perimeter of the fluid being pumped from the well, installed to form a flowing volume (18) of purified liquid connected through the check valve (9) with the operating chamber (33) for alternating connection or disconnection.

Description

Electric Submersible Vibration Pump

Field of the Invention

The invention relates to the field of mechanical engineering, in particular to electric submersible vibration pumps that are operated with the use of inertia of media, for example, by actuation of vibrations inside them - to vibration pumps.

Simple design of well-known vibration pumps makes them low-maintenance both in operation and in service. Since there are no rotating parts and bearings in the design of these pumps, they are slightly heated and do not need constant lubrication, unlike other types of pumps.

Prior Art

An electric submersible vibration pump is known, which has a three-section housing, in the opposite end sections of which there is a suction chamber with inlets and check valves and an electromagnet core with a winding having a connector for connecting to an alternating current network. A pressure chamber is located in the middle section of the housing and is separated from the suction chamber by a partition with a central hole, which periodically blocks the elastic piston connected by the rod to the electromagnet armature. There is a disk-shaped partition with a centering hole for the rod in the junction zone of the pressure chamber and the housing section, where the core and the winding are located. There is a shock absorber in the form of an elastic liner between this partition and the armature. There is a rigid sleeve freely covering the rod and a snap diaphragm adjacent to the piston with a centering hole for the rod on the other side of this partition. A metal spiral return spring is placed in the sleeve cavity, which contacts by one end with the disk-shaped partition, and by the other end - with the snap diaphragm. The pump should be preferably used when pumping water from well bores and wells when there is sand in the filter zone and the bed part (RU 183877).

The specified vibration pump has no means of protection against abrasive wear. The details of such pumps wear out particularly intensively if the submersible vibration pump is used to pump water containing solid inclusions. The rubber piston is the most vulnerable operating part, which fails most often. Dirty water destroys it fast. It is also known an electric submersible vibration pump with electromagnets mounted on both sides of the operating chamber formed by two rubber-metal shock absorbers and a housing in which suction and discharge valves are located. It is characterized in that the efforts of the armored-type electromagnets are directed in one direction, one rubber-metal shock absorber forming the operating chamber is directly rigidly connected to the armature of the electromagnet, and the other rubber-metal shock absorber forming the total volume of the operating chamber is connected to the armature of the electromagnet through the rod, while the pump is powered from a half-wave AC rectifier, where one electromagnet is fed from one half-wave and another electromagnet is fed from the second half-wave. The valves are made as a single part of non-metallic material with a hemispherical head, elastic plates with bending, alternating slots and a sealing flange. The suction and discharge nozzles, where the filter and the fitting are mounted, are set in the top cover (RU 2462623).

In addition, an electric submersible vibration pump is known comprising a housing where an electromagnet is mounted and fixed with a magnetic circuit made of electrical steel strand as a single part and consisting of an inner and outer cylindrical core and a yoke made in the form of a bobbin. An electric coil is mounted in the annular gap between the cores. The armature of the electromagnet is made in the form of a bobbin of electrical steel strand. Its inner and outer diameters correspond to the inner and outer diameters of the cores of the electromagnet. The bobbin is rigidly fixed in the metal washer. The armature of the electromagnet is rigidly fixed through the adjusting washer at one end in the central sleeve with a flat carving and transverse grooves of the rubber-metal shock absorber, and the other end of this rod is rigidly fixed in the central sleeve of the rubber-metal shock absorber, which has transverse and longitudinal grooves. The cover and the rubber-metal shock absorber form the operating chamber and are mounted on the housing. The rubber-metal shock ab sorber is fixed on the same case through the cover on its other end. The rubber-metal shock absorbers are different in stiffness in terms of design and they can be installed on both ends of the housing depending on the sense of the pump to increase the pressure or to increase the flow. Two nozzles are made on the lid, where suction and discharge valves are installed and fixed with non-metal clamps. The valves are mounted with their working surfaces at the same level and are made with a semitoroidal re- cess, forming a sealing belt with the outer diameter of the valve. The pump is equipped with a fitting and a filter and is suspended to the support through a hole in the cover. The power to the coils is supplied via the cable (RU 2389910, prototype).

The disadvantage of these devices is an imperfect design of the pump and pump off-axis and lateral arrangement of the filter in a separate housing on the pump housing, which leads to an increase in dimensions and weight of the product, as well as to a shift in the center of gravity of the pump from its axis when suspended in operating condition or in the well. All above mentioned can increase the amplitude and frequency of vibration of the housing, and lead to self-unscrewing of connecting elements, i.e. to pump failure as a whole. The design of the filter is subject to rapid clogging, and in case of siltation of the well, the pump may soon require repair.

Summary of the Invention

The technical problem to be solved by this technical solution is to create an efficient compact and balanced electric submersible vibration pump, insensitive to the presence of suspended particles in the pumped fluid, as well as expand the range of electric submersible vibration pumps.

The technical result that allows solving the specified problem is a submersible vibration pump adequately protected from clogging without increasing its dimensions using meshes of minimum weight. It has a balanced design without distortion relative to the vertical geometric axial suspension line, which improves the dynamic characteristics of its operation in the well and ensures long-term operation (increased durability) with minimal heating level and wear of wetted part allowing to ensure an increase in operational reliability.

The essence of the invention consists in the fact that the electric vibration pump has an electromagnet composed by a core and a winding, a vibrator with an armature and a rod, as well as a pump with a housing, a cover and a piston. The vibrator armature is connected with the core of the electromagnet on one side and with the rod on the other side along which a shock absorber is fixed, a diaphragm is mounted and a pump piston is fixed, located in the operating chamber of the pump housing made with channels for connecting the discharge chamber, formed by the cover and the pump housing, to the pump cavity equipped with arc-shaped filter meshes covering the pump housing along the perimeter of the pumped fluid intake and installed by forming the flowing volume of the purified fluid connected with the operating chamber through an optional check valve mounted in the housing which is designed to let the pumped fluid into the operating chamber when the armature and the rod with the piston move in the direction of the electromagnet and to stop intake when the armature and the rod with the piston move in the opposite direction.

It is preferable that the pump housing is made with coupled conical and cylindrical parts provided with a transverse wall on one side. The discharge chamber of the pump housing should be made of oval shape and connected to the pump cavity by channels made in inclined protruding radial ribs of the pump housing.

It is preferable that the filter meshes are fixed with forming a flowing volume of purified fluid around the cylindrical part of the pump housing.

It is preferable to provide for the holes with the location making it possible to open and close them by the check valve in the transverse wall of the pump housing between the flowing volume of the purified fluid and the operating chamber.

It is preferable that the check valve is made with an annular deformable section and is installed forming a gap with the transverse wall of the housing when it is open.

It is preferable that the pump housing is provided with an outlet sleeve and a lid where a discharge cavity is provided, equipped with symmetrical eye ends for hanging the electric pump on a cord.

It is preferable that the outlet sleeve is mounted in the cover of the pump housing coaxially with the piston rod and the armature, and sealed with an elastic sealant and secured with a threaded boss.

It is preferable that the shock absorber, diaphragm, piston and check valve are made of elastic material.

It is preferable that the check valve is mounted on a threaded rod fixed in the transverse wall of the pump housing coaxially to the piston rod and piston, and the cover 10 is drawn to the pump housing 1 1 by screws located circumferentially around the geometric center line of the pump.

It is preferable that the pump housing, shock absorber and electromagnet housing are tightened by screws and nuts. Drawings Short Description

Figure 1 shows a general view of electric submersible vibration pump. Figure 2 shows a longitudinal section A-A. Figure 3 shows a longitudinal section B-B. Figure 4 shows an arc-shaped filter mesh. Figure 5 shows a longitudinal section B-B. Figure 6 shows the cover on the top and on the bottom. Figure 7 sows the housing on the top and on the bottom.

Electric submersible vibration pump is a vertical unit consisting of a vibrator with an electric drive and a hydraulic pumping part (a pump) with an axial output.

Detailed Description of the Invention

Preferred Embodiments

Electric vibration pump consists of an electromagnet 1 composed by a core 15 and a winding 16, a vibrator with an armature 2 and a rod 3, as well as a pump with a housing 1 1 and a piston 8, while the armature 2 of the vibrator is connected on one side with the core 15 of the electromagnet 1 and on the other side - with the rod 3, where a shock absorber 4 is fixed, a diaphragm 6 is mounted and the piston 8 of the pump is mounted, located in the operating chamber 33 of the pump housing 11. The pump housing 11 is made with channels 30, 31 for connecting the operating chamber 33 to the discharge cavity 32 of the pump, equipped with a built-in check valve 9 and arc-shaped filter meshes 12 covering the pump housing 11 along the perimeter of the pumped fluid, which are installed to form a flowing volume 18 of purified fluid connected through the mentioned check valve 9 with the operating chamber 33 for alternately connecting or disconnecting them, at that the check valve 9 is configured to pass the pumped fluid into the operating chamber 33 when the armature 2 and the rod 3 with the piston 8 move in the direction of the electromagnet 1 and to stop intake when the armature 2 and the rod 3 with the piston 8 move in the opposite direction.

The pump housing 1 1 is made with coupled conical and cylindrical parts equipped with a transverse wall 36 on one side, while the operating chamber 33 of the pump housing 1 1 is connected to the discharge cavity 32 by channels 30, 31 made in inclined protruding radial ribs of the pump housing 1 1.

The filter meshes 12 are fixed by forming a flowing volume 18 of purified fluid around the cylindrical part of the pump housing 1 1.

Holes 34 are provided in the transverse wall 36 of the pump housing 1 1 be- tween the flowing volume 18 of purified fluid and the operating chamber 33, to open or to close them by the check valve 9.

The check valve 9 is made with an annular deformable section and is installed by forming a gap Z with the transverse wall 36 of the housing 1 1 when it is open.

The pump housing 1 1 is equipped with an outlet sleeve 14 and a cover 10, where the discharge cavity 32 is provided, equipped with symmetrical eye ends for hanging the electric pump on the cord.

The outlet sleeve 14 is installed in the cover 10 of the pump housing 11 coaxially with the piston rod 3 and the armature 2, sealed with an elastic gasket 21 and fixed with a threaded boss 13.

The shock absorber 4, the diaphragm 6, the piston 8 and the check valve 9 are made of elastic material.

The check valve 9 is mounted on a threaded rod 24 set in the transverse wall 36 of the pump housing 1 1 coaxially to the rod 3 and piston 8. The threaded rod 24 can be a regular hexagon head bolt, which is cast into the housing 1 1 during casting and comes into the cavity 33 on one side in order to fix the valve 9.

The pump housing 11 , the shock absorber 4 and the electromagnet housing 1 are tightened with screws 26 and nuts 27.

The vibrator drive is an electromagnet 1. The electromagnet 1 consists of a core 15 and a winding 16, which are hermetically filled with a compound in the housing of the electromagnet 1. A power cable 17 is connected to the winding 16.

The vibrator consists of the armature 2 made of electrical steel sheets, where the rod 3 is pressed in. The cone-shaped shock absorber 4 and the diaphragm 6 with internal thread are placed on the rod 3 from the side protruding from the armature 2, between which a hollow spacing sleeve 5 is located. A ring washer 7 is set from the other side of the diaphragm 6. The shock absorber 5 is rigidly mounted on the rod 3 by nuts (not marked). The diaphragm 6 is set on the rod 3 through the spacing sleeve 5, which is centered in the ring washer 7 by its band and serves as an additional support for the vibrator. The diaphragm 6 and the shock absorber 4 separate the hydraulic part (pumping part) and the electric part of the vibration drive. The piston 8 is mounted on the free threaded end of the rod 3 from the side opposite to the armature 2. The piston 8 is made in the shape smoothly thinned to the periphery. The shock absorber 4 is fixed along its flattened pe- ripheral perimeter between the housing of the electromagnet 1 and the pump housing 11. The normally open check valve 9 with deformable annular locking and regulating element, fixed by a nut 23 on the rod 24, is set on the rod 24 coaxially to the piston 8, the rod 3 and the armature 2.

The shock absorber 4, the diaphragm 6, the piston 8 and the valve 9 are made of elastic material.

The pump housing 1 1 is made as hollow with a cone-shaped part connected to the cylindrical part. Their jointed internal volumes form an operating hydraulic chamber 33 where the piston 8 is placed. The operating hydraulic chamber 33 is connected to the discharge cavity 32 of the pump by channels 30, 31 made in inclined radial protruding ribs (studs) on the side wall of the pump housing 1 1.

The cylindrical part of the pump housing 1 1 is equipped with a filter element made in the form of two partially cylindrical (for example, semi-cylindrical) arcshaped filter meshes 12, each of which is concentrically mounted around the chamber 33 and fixed to the cylindrical part of the pump housing 1 1 by screws 22 tightened into additional protrusions of this part of the pump housing 1 1 by forming an annular (separated by radial ribs and protrusions) volume 18 of fluid cleaned by the filter meshes 12, connected by holes 34 evenly distributed around the circumference of the geometric axis (center line) of the housing 1 1 and the rod 24, through the normally open check valve 9 with the operating hydraulic chamber 33.

The valve 9 is made of elastic material with a deformable annular peripheral section, i.e. with the possibility for bending. There is a sleeve 19 in the central part of the valve 9 that is made of rigid material and is put on the rod 24. The gap Z connected to the holes 34, when the valve 9 is open, is formed between the upper (according to the drawing) surface (end) of the annular section of the valve 9 and the cylindrical boss assembly (collar), protruding the gap value, in the transverse wall 36 of the housing 1 1. The gap value Z is chosen from the condition of connection or disconnection of the valve 9 of the annular volume 18 with the operating hydraulic chamber 33 in the absence or presence of pressure in it, accordingly, created by the piston 8. For this purpose, the check valve 9 is designed that if there is no pressure in the chamber 33, it provides an open state of the holes 34 and the volume 18 is connected to the chamber 33 through the gap Z between the middle part of the transverse wall 36 of the housing 11 and the valve 9. During dis- charge and in case of the pressure in the chamber 33 created by the piston 8 during operation of the actuator, the valve 9 closes the holes 34 and the volume 18 is disconnected from the chamber 33 due to the clamping of the elastic peripheral annular section of the valve 9 to the transverse wall 36 of the housing 11 and the overlap of the holes 34 accordingly.

The cover 10 is pulled to the pump housing 1 1 by 6 screws 40 (self-driving) located circumferentially around the geometrical axial line of the pump. The screws 40 are evenly tightened into the plastic array of the housing 1 1 , in the area formed by the studs and ribs of the housing 11. The cover 10 is sealed along the housing 11 by an oval elastic seal 20. The cover 10 has openings (not marked) at the periphery for connecting the discharge cavity 32 by channels 30, 31. The discharge cavity 32 is formed by curved walls 25 and is made oval on the bottom side (according to the drawing) of the cover 10. Counter curved walls 26 are made on the housing 1 1. The ring 20 has an oval shape, equidistant to the walls 25, 26 which form the cavity 32. Such configuration of the cavity 32 and the ring 20 (i.e., oval, instead of cylindrical) may be preferable as in conjunction with the housing 1 1 it allows to reduce the area affected by overpressure and to reduce the load on the parts 10 and 1 1. Outlet discharge fitting 14 is mounted in the cover 10 of the pump housing 1 1 that is sealed by the elastic seal 21 and fixed with the threaded boss 13. The cover 10 of the pump housing 1 1 has symmetrical eye ends for hanging the electric pump on a cord in a well bore or in a well.

The outlet fitting 14 is located along the longitudinal (vertically according to the drawings) geometrical axial line of the pump, which allows the pump to be suspended in the well bore on a cord without distortion. The outlet fitting 14 is fixed by a threaded boss 13, which prevents from disconnecting the hose from the fitting 14 when dismounting the pump from the water supply, but allows to remove the fitting 14 fast and easily from the cover 10 of the pump housing 1 1. The cover 10 of the pump housing 1 1 has symmetrical eye ends (not marked).

Submersible vibration pump operates as follows.

The electric vibration pump operates by changing the pressure in the discharge cavity 32. The suction of water into the operating chamber 33 from the space surrounding the pump housing 1 1 is provided by the reciprocating movements of the elastic (rubber) piston 8.

When the electric pump is connected to an alternating current electric network, current is supplied to the winding 16 of the electromagnet 1, as a result of passing of the alternating electric current through the loops of the winding 16 of the electromagnet 1 a magnetic field is created in its core 15. The direction of its lines is changed with fluctuation frequency of the alternating current 50 times per second.

The pump armature 2 begins to be attracted to the core 15 of the winding 16 under the influence of variable magnetic field, then repelled from it, making a recip- rocating motion (vibration).

The movements of the armature 2 through the rod 3 are transmitted to the piston 8, which also makes axial movements inside the operating hydraulic chamber 33. Moving towards the armature 2, the rod 3 deforms the shock absorber 4, and the piston 8 increases the suction volume of the operating chamber 33, which creates a vac- uum inside resulting in the suction evenly around the circumference of the liquid medium from the underground source through the meshes 12, the volume 18 and the holes 34 of the pump housing 11. During sucking the water by the pump, the check valve 9 is open and freely passes the fluid purified by the meshes 12 and uniformly distributed around the circumference of the flow from the volume 18 into the operat- ing inner chamber 33 of the housing 11.

When the piston 8 moves in the opposite direction by using the deformation energy of the shock absorber 4, the pressure of the water already pumped into the inner chamber 33 rises, which helps to close the holes 34 by the check valve 9 and push the liquid medium through the channels 30, 31 into the discharge cavity 32 and through the outlet fitting 14 to the consumer line. Such strokes of suction and pushing by the piston 8 of the pumped fluid are repeated at frequency of 100 times per second. 100 half-cycles-passes through the zero point of a sinusoid occur at AC network frequency of 50 Hz passing, i.e. 100 pulls and releases of the armature 2 made by the winding 16.

Thus, in the absence of pressure in the chamber 33, the valve 9 provides the open state of the holes 34 and the volume 18 is connected to the chamber 33 through the gap Z between the middle part of the transverse wall 36 of the housing 11 and the valve 9. If there is pressure in the chamber 33 created by the piston 8, the holes 34 are closed evenly around the entire circumference and disconnect the volume 18 from the chamber 33 due to the clamping of the elastic peripheral annular section of the valve 9 against the transverse wall 36 of the housing 11 and thereby overlapping the holes 34.

As a result of the pump operation described above, the valve 9 connects the holes 34 to the chamber 33 through the gap Z between the transverse wall of the housing 11 and the valve 9 in the absence of excessive pressure in the chamber 33 (in the suction stroke of the electric pump). The holes 34 are disconnected from the chamber 33 in case of pressure in the chamber created by the piston 8, i.e. when compressing the elastic peripheral part of the valve 9 and closing, thereby, the gap Z (in the discharge stroke of the electric pump).

The invention is characterized by the presence of quick-detachable, accessible for operational visual control and washing, and easily replaceable filter elements (meshes) 12 at the suction in the pump. The structurally optimal concentric location and fastening of the filter meshes 12 directly around the pump housing 11 , without increasing its dimensions, and the central location of the valve 9 ensure the movement of the pumped fluid that is almost stable and symmetrical along the geometrical axial line of the pump. This prevents the formation of local sedimentation areas, as well as vortex formation in the housing 1 1 and prevents the actuation of extraneous vibrations of the device as a whole. This is facilitated by the fact that the output nozzle 14 is located along the geometrical axial line of the pump allowing the pump to be suspended vertically in the well bore on the cord without distortion.

The proposed electric submersible vibration pump is adequately protected from clogging without increasing its dimensions by means of concentric and symmetrically installed filter meshes of minimum weight. It has a balanced design without distortion with respect to the geometrical axial line for suspending the pump, which improves the dynamic characteristics of its operation in the well bore and creates the conditions for long-term operation (increased durability) with minimal wear of wetted part allowing to increase the serviceability.

The mechanism of the vibration pump is almost completely washed from the outside by the entire flow of fluid entering through the filtering meshes. It almost does not heat up, thus it wears out with less intensity. The design of the vibration pump without rotating parts and bearings makes it easy both in operation and in maintenance. The declared submersible vibration pump is characterized by increased maintainability, reliability and a long service life, due to the presence of easily accessible concentrically and symmetrically installed filter elements (meshes) around the pump housing, effectively protecting it from pollution, as well as the ability to vertically suspend the pump in the well bore (well) without distortion excluding asymmetric loads on its moving parts.

Industrial Application

The present invention can be embodied with multipurpose equipment extensively employed by the industry.

Claims

1. An electric vibration pump with an electromagnet consisting of a core and a winding, a vibrator with an armature and a rod, as well as a pump with a housing, a cover and a piston, while the vibrator armature is connected with the electromagnet core on one side and with the rod on the other side, along which a shock absorber is fixed, a diaphragm is set and a pump piston is mounted, located in the operating chamber of the pump housing made with channels for connecting the discharge chamber, formed by the cover and the pump housing, to the pump cavity equipped with arc-shaped filter meshes covering the pump housing along the perimeter of the pumped fluid intake and installed by forming the flowing volume of the purified fluid connected with the operating chamber through an optional check valve mounted in the housing which is designed to let the pumped fluid into the operating chamber when the armature and the rod with the piston move in the direction of the electromagnet and to stop intake when the armature and the rod with the piston move in the opposite direction.

2. The electric vibration pump according to claim 1 is characterized in that the pump housing is made with coupled conical and cylindrical parts provided with a transverse wall on one side, while the discharge chamber of the pump housing is made of oval shape and connected to the pump cavity by channels made in inclined protruding radial ribs of the pump housing.

3. The electric vibration pump according to claim 2 is characterized in that the filter meshes are fixed by forming the flow volume of purified fluid around the cylindrical part of the pump housing.

4. The electric vibration pump according to claim 3 is characterized in that the transverse wall of the pump housing between the flowing volume of the purified fluid and the operating chamber has holes located to open or close them by the check valve.

5. The electric vibration pump according to claim 4 is characterized in that the check valve is made with an annular deformable section and is installed by forming a gap with the transverse wall of the housing when it is open.

6. The electric vibration pump according to any one of claims from 1 to 5 is characterized in that the pump housing is equipped with an outlet fitting and a cover, where a discharge cavity is placed, equipped with symmetrical eye ends in order to hang the electric pump on a cord.

7. The electric vibration pump according to claim 6 is characterized in that the outlet fitting is installed in the cover of the pump housing coaxially with the piston rod and the armature, sealed with an elastic seal and fixed by a threaded boss.

8. The electric vibration pump according to any one of claims from 1 to 5,7 is characterized in that the shock absorber, diaphragm, piston and check valve are made of elastic material.

9. The electric vibration pump according to any one of claims from 1 to 5,7 is characterized in that the check valve is mounted on a threaded rod fixed in the trans- verse wall of the pump housing coaxially to the rod and piston, and the cover 10 is pulled to the pump housing 11 by screws located in a circle around the geometric center line of the pump.

10. The electric pump according to any one of claims from 1 to 5,7 is characterized in that the pump housing, shock absorber and electromagnet housing are tightened with screws and nuts.