EP0541883A1 - Pump driven by reaction turbine - Google Patents

Abstract

The invention relates to motor-driven pumps (1) with turbine, driven by a fluid at high pressure, and more specially intended for the pumping of liquids and of laden liquids. The motor-driven pump (1) according to the invention comprises a rotating sleeve (15) mounted in line between two fixed rings (13, 14). To the internal surface of the sleeve (15) are secured pumping members (31, 32) such as helical vanes. The outer surface of the sleeve (15) forms the rotor of a turbine into which a pressurised fluid is injected radially in a centripetal manner, from a distribution volute (8).

Description

The invention relates to a jet pump powered by a pressurized fluid for pumping liquids or liquids laden with solids.

Motor pumps with rotary pump and turbine drive are already known. These motor pumps are distinguished not only by the types of pumps used and by the model of the turbine, but also by the reciprocal arrangement of the turbine and the pump, and ipso facto, by the mechanical transmission of the movement between these two constituent parts of the motor pump.

Motor pumps are known in particular, in which the turbine and the pump are arranged in line, that is to say that the axis of the pump and the axis of the turbine are placed in the extension one of the other. In such motor pumps, at least one of the two pipes (inlet and outlet) of the pump is arranged perpendicularly or obliquely to the axis of the pump, while the second pipe is either arranged perpendicularly or obliquely relative to the axis of the pump, or in line with the axis of the pump (on the side of the pump which is opposite the turbine).

Application DE-A-3 008 334 describes a tangential turbine driving a pump whose rotary body is formed by the hollow shaft of the turbine; the machine described in application DE-A-3 008 334 operates with steam; the machine described is bulky and suitable only for static use.

The document CH 465 413 describes a single-axis pump intended for a fixed installation in an atomic power station. The pump is driven by a peripheral turbine. The pump rotor has a central hub, supported by bearings which encroach on the available section, with no possible mixing between the working fluid and the pumped fluid.

US Pat. No. 2,113,213 describes cylindrical pumps formed from a small rotary pump and a concentric turbine. These pumps are intended to operate in wells to extract water or oil. These pumps, mounted in series, are placed in an enclosure and driven under the sheet to be pumped. Each pump has vents at its base. When a pressurized fluid is injected into the enclosure, it rises through the vents, putting the turbine in rotation and thus actuating the pump. The working fluid then mixes completely with the pumped liquid to rise to the surface.

For certain applications, the motor pumps currently known all have serious drawbacks, this is particularly true for submerged motor pumps used for dredging operations.

In suction dredgers, the elinde is fitted with a suction pipe intended to bring the dredged material (mud and / or sand) into the dredger wells or into discharge pipes.

Aspiration can be ensured by a motor pump mounted on board the dredge. However, such a system is only suitable for relatively shallow dredging depths.

For dredging to a greater depth, it is generally necessary to use a submerged motor pump, mounted on the suction pipe, and this as low as possible.

Such a submerged motor pump therefore works under load and therefore its suction performance is improved. However, the use for such applications of currently known motor pumps creates very serious technical problems which are in particular due to the high weight and the large size of these motor pumps and the bent pipes which are connected thereto. Thus, a submerged dredging motor pump that can be connected to piping with a diameter of 650 mm, represents commonly a weight of the order of 25 t, a length of 6 m and a lateral space requirement of 3 m (including bent pipes and the frame necessary to take up the stresses generated during maneuver and operation). The operation of a dredge head equipped with such a motor pump of known type requires heavy and expensive handling equipment, and a lot of skill.

Another problem comes from the harsh environment (mechanically speaking), in which these motor pumps must be used, namely a generally aggressive water, such as sea water, loaded with salt and particles of varied particle size.

To protect the delicate parts of these motor-driven pumps, use is generally made of extremely efficient sealing devices, in particular to protect the bearings and the elements of the turbine, which therefore increases the weight and the bulk and also installs cost and ease of maintenance and heat dissipation issues.

Patent EP-0 033 640 from the same inventor describes a turbine pump driven by a pressurized fluid more particularly suitable for dredging operations in which the pump and the turbine are arranged concentrically, the working fluid and the pumped liquid passing through the motor pump in an axial direction. A motor pump according to EP-0 330 640, despite its qualities, does not yet solve all the problems. In view of its power, it is still quite bulky and developed in length, which implies a high cost (in weight of metal), as well as the use of relatively expensive handling equipment; it requires a large volume of working fluid, therefore large diameter supply pipes, which results in a significant additional weight. Its dimensions still make it sensitive to the stresses incurred during maneuvers and in service. Furthermore, the disassembly of the various organs still requires time still requires considerable time, precisely when, under the working conditions to which it is subject, these dismantling operations are relatively frequent. Finally, the regulation range of such a motor pump is, in practice, quite narrow, which does not make it possible to adapt optimally to all the circumstances occurring in service (increase in load, mounting of pumping members of a different nature).

The motor pump according to the invention, which will be described below, can be used in particular as a submerged motor pump and is in particular very advantageous as an immersed dredging motor pump and for the exploitation of marine sediments at great depth. The application of the motor-driven pump according to the invention is however not in any way limited to these particular cases and it can also be advantageously used as a non-submerged motor-driven pump for pumping various liquids or liquids laden with solids (for example suspensions ores and / or coal in the water).

Attempts have been made to produce a motor pump having, with equal suction power, greater compactness in length and a reduced weight compared to what was known in the prior art.

Another object of the invention is to obtain a very robust motor-driven pump, self-supporting by its very structure, and resistant to axial stresses as well as to torsion and bending.

Another object of the invention is to provide a motor pump which allows easy control of the speed of the turbine and, thereby, of the flow and pressure of the pumped liquid.

The invention also aims a motor pump of lower manufacturing cost, at equal power, than what is known in the state of the art.

Another object of the invention is to provide such a motor pump which can be advantageously used for the pumping of liquids heavily loaded with solids and therefore suitable as a dredging motor pump or exploitation of seabed sediments.

In addition, the invention aims to provide such a motor pump in which the energy losses are significantly reduced.

Another object of the invention is to provide a motor pump whose bearings are effectively protected having regard to their conditions of use.

Finally, another object of the invention is a motor pump with low maintenance cost and whose members can easily be replaced.

The subject of the invention is a motor-driven turbine pump driven by a pressurized fluid and rotary pump intended for pumping liquids and liquids laden with solid particles, which comprises:
a fixed pump body comprising a tube constituting a cylindrical suction orifice and a tube constituting a cylindrical discharge orifice, these two tubes, of the same internal diameter, being arranged in line with one another;
a rotary sleeve, of internal diameter substantially equal to that of these two pipes, mounted in line between these pipes, with a small clearance relative to the latter, this sleeve being able to rotate around its axis, rotary pumping members being mounted inside this sleeve and being integral therewith;
a drive turbine actuated by pressurized fluid mounted in a ring around the sleeve, a rotor supporting the blades of the turbine being mounted outside the sleeve and being integral with the latter;
injection means allowing the injection of a fluid into the turbine and expulsion means allowing the evacuation of this fluid out of the turbine;
an envelope which secures the fixed body of the turbine to the fixed pump body and forms a space annular around the assembly formed by the sleeve and the two pipes.

In this motor-driven pump, the turbine is a reaction turbine which comprises a rotor which flares out on the injection side, then goes tighter towards one of its ends; this rotor supports vanes which extend on the side of the injection of the pressurized fluid, substantially in the radial direction and on the side of the discharge of this fluid, substantially in the axial direction, however marking a slight divergence from in this axial direction;
the injection means are arranged in a ring around the turbine and comprise a distribution ring fixed to the casing in an easily removable manner;
the envelope comprises two cylindrical elements assembled end to end in an easily removable manner;
regulating means capable of influencing the flow of pressurized fluid are arranged around the turbine, between the distribution ring and the rotor.

According to an advantageous embodiment, the motor pump comprises a simple rotor, the means for expelling the pressurized fluid being located on the side of the delivery orifice.

According to another advantageous embodiment, the motor pump comprises a double rotor formed by two rotors paired on the same sleeve, with their joint admission, the means for expelling one of these rotors being located on the side of the discharge orifice , the means for expelling the other rotor being located on the side of the suction orifice.

Preferably, annular seals are arranged between the sleeve and the pipes, these seals being able to prevent the passage of pumped liquid and particles from the interior of the sleeve to the annular space constituting the interior of the envelope without impede the rotation of the sleeve.

The annular space constituting the interior of the casing is advantageously subdivided, on each side of the sleeve, into two chambers separated by a rotary joint, the first chamber being separated by an annular seal from the interior of the pump, the second chamber opening onto a bearing, this second chamber being disposed on the passage of the pressurized fluid escaping from the turbine and capable of being put under slight overpressure relative to the first chamber, so as to prevent the passage of pumped liquid, loaded with solid particles, towards the bearings.

The cylindrical elements are preferably extended on the side of their common end, by a flange extending outwards.

According to a preferred embodiment, the regulation means include adjustable fins and fixed deflectors.

The rotary pumping members comprise, according to a proven embodiment, helical blades (developing from the internal face of the sleeve and directed towards the axis thereof).

According to an embodiment of the above embodiment, an empty space extends between the axis of the sleeve and the blades.

According to another embodiment, said blades are connected along a line which coincides with the axis of the sleeve.

According to another embodiment, the rotary pumping members comprise an Archimedes screw.

In yet another embodiment, the rotary pump is a Moineau pump, the external part of which is integral with the internal face of the sleeve and disposed along the axis thereof, one of the ends of the central part, engaged in the part external, being fixed by a coupling to a shaft, the other end of this shaft being connected, also by a coupling, to a support integral with the fixed pump body.

Another object of the invention is a device removal of sediment from the sea, river or lake bottom mounted on a dredging machine and comprising a elinde, one end of which, intended to be submerged, is equipped with a head, and at least one motor pump connected to said elinde; this device comprises at least one motor-driven pump conforming to what has been described above which is connected to the strainer near its submerged end; the axis of rotation of these or this motor-pump coinciding with the axis of the strainer so that the pumped sediments do not undergo an axial change of direction going up towards the other end of the strainer.

This device can be installed on a dredging boat, for example, whether it is trailing, stationary or fixed point, with disaggregator. It can also be used on a deep-sea nodule exploitation boat.

An advantage of the turbopump according to the invention lies in its reduced weight compared to other machines ensuring the same function, with equal characteristics.

Another advantage is that the speed of the turbine can easily be adjusted, which makes precise control of dredging operations possible.

Another advantage, again, is that, given the possible variations in the torque and in the speed of the turbine, the motor pump can be equipped with a large variety of different pumps, depending on the applications.

Another advantage is that the motor pump can be easily disassembled and reassembled, which makes it possible to check the state of wear of the parts in a minimum time.

Another advantage is that, due to the presence of a double partitioning by "clean" fluids between the bearings and the pumped water, loaded with solid particles, the bearings benefit from a very long service life.

Another advantage is that the turbine is powered by a high pressure fluid, so that the volume of fluid used, and therefore the size of the conduits can be reduced.

Another advantage is that the motor pump can be used in all positions and at any angle.

Another rather unexpected advantage is that there is a virtual absence of cavitation phenomena in the turbine and even at the pump (depending on its type and depending on the operating depth), which has a very favorable influence on the service life of the turbopump.

An appreciable advantage, finally, is that the turbine with its pump overall provides a very high efficiency (of the order of 72%) over a wide speed range.

• la Fig. 1 est une vue latérale, partiellement en coupe,d'une motopompe selon l'invention équipée d'une pompe à pales;
• la Fig. 2 est une vue latérale, partiellement en coupe, d'une motopompe selon l'invention, équipée d'une pompe Moineau;
• la Fig. 3 est une vue latérale, partiellement en coupe, avec arrachement localisé d'une motopompe équipée d'une pompe à vis d'Archimède, et
• la Fig. 4 est une vue schématique d'un dispositif de dragage selon l'invention.

Other particularities and advantages of the invention will emerge from the description of particular embodiments described below, in this case two dredging motor pumps, given by way of nonlimiting example, reference being made to the appended drawings, in which :

• Fig. 1 is a side view, partially in section, of a motor pump according to the invention equipped with a vane pump;
• Fig. 2 is a side view, partially in section, of a motor pump according to the invention, equipped with a Moineau pump;
• Fig. 3 is a side view, partially in section, with localized cutaway of a motor pump equipped with an Archimedes screw pump, and
• Fig. 4 is a schematic view of a dredging device according to the invention.

The motor pump 1 shown in FIG. 1 comprises an envelope essentially formed by two cylindrical elements 2. These elements 2 are joined to each other with a small gap by flanges 3 extending outwards. This union is achieved by assembly means, in this case bolts 4. Each bolt 4 is mounted on spouts 5, which allows it to rotate after tightening. Each bolt 4 supports, in its middle a movable fin 6 and can be rotated by means of pivoting washers 7 actuated by a pivoting device (not shown).

The two cylindrical elements 2 and their flanges 3 form the stator of an easily removable turbine. A scroll fluid distributor element 8 in the form of a volute is fixed to the periphery of the stator, at the level of the gap separating the two flanges 3.

Fixed fins 9 are arranged between the flanges 3 so that the fluid is optimally oriented, the movable fins 6 making it possible to vary the angle of attack of this fluid and therefore to vary the speed of the turbine .

The free ends of the cylindrical elements 2 are fixed by bolts each to a conical part 10, 11 of inlet or outlet comprising a fixing flange 12 at its end of smaller diameter. This mounting flange 12 makes it possible to connect the motor pump 1 to suction and discharge pipes (not shown). To the internal face of these conical parts is fixed an annular part 13, 14, these annular parts 13, 14 constituting the suction and discharge orifices of the pump and also the fixed part of the pump. These parts 13, 14 converge slightly towards their end so as to give the pump 1 an optimum efficiency.

Between these two annular parts 13, 14 is disposed a sleeve 15 aligned along the same axis as these annular parts 13, 14 and having at its ends substantially the same internal diameter as these annular parts 13, 14.

This sleeve 15 is a common element between the pump and the turbine, which constitutes both the border between these two essential parts of the motor pump and the transmission between these two parts.

The rotor 16 of the turbine with its blades 17 is attached to or part of the outer face of the sleeve. The blades 17 extend from a part of the rotor 16 of larger diameter located opposite the inlet 18 (which is arranged radially) in a double curvature to a part of this rotor 16 of smaller diameter where said blades 17 are arranged substantially axially, which makes it possible to recover energy from the fluid under high pressure with very high efficiency. Note, however, the slightly divergent shape of the vanes 17 as they approach the exhaust chamber.

The rotor shown in FIG. 1 constitutes a double rotor, that is to say that it is provided with two rotors comprising two series of matched blades 17, one pointing, in the axial direction, on the same side as the inlet orifice 14 of the motor pump 1, the other pointing in an axially opposite direction. This configuration has the advantage of practically balancing the axial thrust generated by the fluid under pressure on the rotor 16.

If the second rotor 16 is not used, the rotary mass can be lightened by providing blind holes therein also serving for dynamic balancing of the moving part.

In the case (not shown) of a simple rotor 16 motor pump, the exhaust is arranged on the same side as the discharge orifice 13 of the pump, so as to generate on the rotor 16 a thrust opposite to that generated by the liquid pumped on the pump rotor. When the motor-driven pump 1 is in operation, the volute distributor 8 is supplied with a fluid under high pressure. This fluid is distributed around the turbine and escapes centripetally between the two flanges 3.

Guided by the deflectors 9 and the fins 6, the pressurized fluid reaches the vanes 17 to which it imparts a thrust causing the rotation of the sleeve 15, and, thereby, pumping means 19 which are fixed to its internal face.

The working fluid is released after use in two exhaust chambers 20 arranged on either side of the turbine.

The calibrated orifices 21 are drilled over the entire periphery of these chambers 20 so as to allow the fluid under pressure to escape while maintaining a slight overpressure with respect to the ambient medium inside these chambers.

Axial 22 and radial 22a bearings and their seals 22b are placed at the outer periphery of the sleeve 15. These members are lubricated by a fraction of particularly purified and centrifuged fluid introduced under pressure by supply channels passing through the axial 22 and radial bearings 22a and supplied by external conduits 22c supplied by a pump (not shown), which can moreover, if necessary, be on the surface; the punctual injection of lubricating fluid allows the rotor 16 of the turbine to literally "float" and remain centered in a stable manner on the center of rotation of the mobile part.

These axial 22 and radial 22a bearings and their seals 22b pierced with supply capillaries are located out of reach of the liquid loaded with particles which passes through the pump. This liquid should indeed, to reach the bearings 22 and 22a, cross a double barrier of fluid. The bearings 22 and 22a in fact adjoin the two exhaust chambers 20 of the turbine. The surrounding fluid, under overpressure, creates a first protection for these bearings 22 and 22a.

Each exhaust chamber 20 communicates via a sliding contact with a second chamber 23 which is itself under overpressure relative to the interior of the sleeve 15. This overpressure is obtained by the presence of a connection conduit 24 opening into the second chamber 23 to which is connected a water pump (not shown). The "clean" water supplying this pump is taken from the environment (at the level of the conical elements 10, 11 or further, or even at the surface). This water is injected into the second chambers 23 at a pressure higher than that prevailing in the pump body under operating conditions where the chambers 23 are located, it will be noted that this pressure will not be identical depending on whether one is located on the "upstream" side or on the "downstream" side of the pump and that the pressure in these chambers must therefore vary accordingly.

The interval separating, on each side, the pivoting sleeve 15 from each annular part 13, 14 is closed by a rotating sleeve 25 which plays the role of both a rotating joint and a pumping joint due to its configuration ( which has helical grooves). In front of these rotating sleeves 25 are disposed, at the inlet 14 and outlet 13 ports of the pump, fixed wear seals 26. Flexible seals 27, each fixed by a tightening ring 28 and by bolts, ensure closing the space remaining between the rotating sleeves 25 and the fixed wear seals 26. These junctions 25, 26, 27, of a well-known type, prevent the migration of particles from the pumped liquid to the second chamber 23 and from there to the axial and radial bearings 22, 22a.

O-rings 29 of different diameters are arranged between the various parts of the stator (for example, between the cylindrical elements 2 and the two conical parts 10, 11, respectively of suction and discharge), which makes possible easy disassembly of the part more specifically affected by dredging (that is to say the pump) without having to dismantle the turbine.

Reinforcement structures 30 extend between each flange 3 and the corresponding cylindrical element 2; the motor pump 1 thus equipped withstands very well both the stresses in tension and the torsional moments likely to occur in extreme operating conditions.

The mounting of such reinforcement structures 30 consisting of spacers or sheet metal elements is however optional when the pump is not working under demanding conditions. The second part of the motor pump 1 is constituted by the pump itself which consists of pumping means 31 fixed inside the sleeve (either as shown in Fig. 1, helical blades), the pump comprising a part mobile (the sleeve 15 and the blades 31) and a fixed part (the fixed suction and discharge rings 13, 14).

We see that the blades 31 of the motor pump are connected towards the center of the interior space of the pump to a spindle hub 32. The rear of this spindle hub 32 is connected to a hydrodynamic extension 33 maintained by d-shaped supports 'fins 34 fixed to the delivery ring 13.

The advantage of the motor pump 1 is that the energy of the working fluid is transmitted without mechanical losses due to a coupling or a speed reducer directly to the pump; in addition, thanks to the turbine, the risks linked to the use of electricity in the marine environment or in humid places (inherent to pumps with electric motor) are eliminated.

Fig. 2 shows a motor pump 35 similar to the motor pump 1 shown in FIG. 1, but fitted with an "inverted" sparrow pump and not with a vane pump.

The outer part 36 of the Moineau pump is fixed inside the rotary sleeve 15.

The central part 37 of the Moineau pump is fixed, by means of a coupling 38, to the end of a shaft 39 which, by its other end, is connected by means of a coupling 40 to a fixed support integral with the suction pipe.

A motor pump 35 equipped with a Moineau pump is particularly advantageous for pumping at constant flow rate, under high pressure, viscous mixtures such as mud or clay mixtures.

Fig. 3 is a sectional view of an embodiment of the turbopump in which the pumping means have the form of an Archimedes screw. We see that the motor pump is suitable for mounting a wide variety of rotary type pumps.

Fig. 4 schematically illustrates a type of dredging boat 42 provided with in-line dredging devices 43 according to the invention.

A dredging device 43 is arranged on the port side, in the raised position for transport.

A second device 43 is in place, lowered towards the bottom. Each device 43 comprises a strainer 44 which is brought back to the bottom to be dredged. This strainer 44 is connected to a secondary strainer 45. This secondary strainer 45 is connected to the suction orifice of a motor pump according to the invention. The latter is constantly "in charge" and returns the liquid sucked in via the main strainer 46 to the suction pump 47 placed on board the dredging boat 42. Depending on the power of the pump according to the invention, this pump d suction 47 can simply be omitted. If the depth or density of the pumped liquid justifies it, it is perfectly possible to place a second pump 1 in line behind the first. From the strainer 44 of the elbow 48 of connection to the suction pump 47, the loaded liquid hardly meets a change of direction; pressure losses due to friction are therefore reduced to a minimum, in fact the particles of the mixture remain in suspension due to the agitation supplied by the pump, most of the energy being used to raise the sludge from the bottom to the dredging well. There is practically no wear due to the localized and concentrated impact of particles (as in the case where centrifugal pumps are used).

Although the motor pump according to the invention has been described in the context of an application to dredging, it can also be used for other applications with different types of rotary pumps whenever trying to reduce the size of a pump and its drive system, or when it comes to working in difficult conditions from the point of view of maintenance, for liquids laden with salts or mineral particles (coal, sand, diamond-bearing mud, etc.) and in particular in mines, in the transport of waste water, etc.

Since the strain 43, 46 and the pump (or pumps) are aligned along the same axis, the damage caused by larger debris is also limited.

A particularly advantageous point is the fact that, within an environment particularly testing for the material, in this case the marine, saline and corrosive environment, the dredge pump precisely uses the surrounding liquid, additionally charged, to actuate and lubricate the moving components. This considerably simplifies its design and maintenance and provides a coefficient of prolonged use.

This design is also advantageous with regard to environmental protection: there is indeed no addition of other liquids of different composition which can give rise to a disturbing effect on the environment; on the other hand, the liquid used is not contaminated by the presence of lubricant residues, since these polluting products are simply not used in the pump.

It is also noted that the pump 1 being in the axis of the elinds 45, 46 supports much better the stresses generated by the maneuvers (embarkation, disembarkation) and the service (hooking, immobilization of the bottom strainer by suction effect, effect of drop).

Its design is very light due to its unique casing, the absence of couplings and parts fragile to protect. It is thus easy to use such a dredging device operating at very great depths, taking care to pair each time two motor pumps rotating in opposite directions to avoid the effects of torsion (due to the torque of the turbines) on the rope 46. The possibility of working with relatively small payload hoists is also an important economic factor. This possibility that the pump has the ability to work even at very great depths, without maintenance or leakage problems, allows it to be used successfully for maritime work as special as the exploitation of nodules. In this case, the elind is kept vertical and comprises a sufficient number of concentric pumps 1 to ensure the delivery of nodules taken from the seabed to the surface. Here too, care is taken to rotate the pumps, two by two, in opposite directions so as not to subject the elinde to excessive torsional force at start-up or when the speed of the turbines is changed.

The technical unemployment time of such a pump is also very reduced: its design is by definition extremely robust and the parts subject to wear can be easily replaced without complete disassembly of the turbine and its structure.

Claims (13)

Motor-driven turbine pump driven by a pressurized fluid and rotary pump intended for pumping liquids and liquids laden with solid particles, which comprises:
a fixed pump body comprising a tube (14) constituting a cylindrical suction orifice and a tube (13) constituting a cylindrical discharge orifice, these two tubes (13, 14), of the same internal diameter, being arranged in line l 'one in relation to the other,
a cylindrical sleeve (15), of internal diameter substantially equal to that of these two pipes (13, 14) mounted in line between these pipes (13, 14), with a small clearance relative to these, this sleeve (15 ) being able to rotate about its axis, rotary pumping members (31, 32) being mounted inside this sleeve (15) and being integral with the latter,
a drive turbine actuated by pressurized fluid mounted in a ring around the sleeve (15), the rotor (16) supporting the blades (17) of the turbine being mounted outside the sleeve (15) and being integral with that -this,
injection means (8) allowing the injection of a fluid into the turbine and evacuation means (20) allowing the evacuation of this fluid out of the turbine,
an envelope (2, 10, 11) which affixes the fixed body of the turbine with the fixed pump body (13, 14) and forms an annular space around the assembly formed by the sleeve (15) and the two pipes ( 13, 14), characterized in that:
the turbine is a reaction turbine which comprises a rotor which widens on the side of the injection then goes by tightening towards one end, this rotor supporting blades (17) which extend on the side of the injection (18 ) pressurized fluid, substantially in the radial direction and on the discharge side (20) of this fluid, substantially in the axial direction, however marking a slight divergence from this axial direction;
the injection means (8) are arranged in a ring around the turbine and comprise a distribution volute (8) fixed to the casing (2, 10, 11) in an easily removable manner,
the envelope (2, 10, 11) comprises two cylindrical elements (2) assembled end to end in an easily removable manner,
regulating means (6) capable of inflecting the flow of pressurized fluid are arranged on the periphery of the turbine, between the distribution volute (8) and the rotor (16). Motor pump according to claim 1, characterized in that it comprises a simple rotor (16), the means for discharging (20) the pressurized fluid being located on the side of the discharge orifice (13). Motor pump according to claim 1, characterized in that it comprises a double rotor (16) formed by two paired rotors, with their joint admissions, the discharge means (20) of a rotor being located on the side of the orifice discharge (13), the discharge means (20) of the other rotor being located on the side of the suction orifice (14). Motor pump according to any one of the preceding claims, characterized in that annular seals (25; 26) are arranged between the sleeve (15) and the pipes (13, 14), these seals (25, 26) being able to prevent the passage of pumped liquid and particles from the interior of the sleeve (15) to the annular space constituting the interior of the envelope (2, 10, 11), without hampering the rotation of the sleeve (15). Motor pump according to claim 4, characterized in that the annular space constituting the interior of the envelope is subdivided, on each side of the sleeve, into two chambers (20, 23) separated by a rotary joint (25), the first chamber being separated by an annular joint (25) from the interior of the pump, the second chamber (20) opening onto a bearing (22), this second chamber (20) being arranged on the passage of the pressurized fluid escaping from the turbine and capable of being put under slight overpressure relative to the first chamber (23), so as to prevent the passage of pumped liquid, laden with solid particles, to the bearings (22). Motor pump according to any one of the preceding claims, characterized in that the cylindrical elements (2) are extended on the side of their common end, by a flange (3) extending outwards. Motor pump according to any one of the preceding claims, characterized in that the regulation means (6) comprise adjustable fins (6) and fixed deflectors (9). Motor pump according to any one of the preceding claims, characterized in that the rotary pumping members comprise helical blades (31) developing from the internal face of the sleeve (15) and directed towards the axis of the latter. Motor pump according to claim 8, characterized in that an empty space extends between the axis of the sleeve (15) and the blades (31). Motor pump according to claim 8, characterized in that said blades (31) are connected along a line which coincides with the axis of the sleeve (15). Motor pump according to any one of Claims 1 to 7, characterized in that the rotary pumping members comprise an Archimedes screw. Motor pump according to any one of Claims 1 to 7, characterized in that the rotary pump is a Sparrow pump, the external part of which (36) is integral with the internal face of the sleeve (15) and arranged along the axis thereof, one of the ends of the central part 37, engaged in the external part (36), being fixed by a coupling (38 ) to a shaft (39), the other end of this shaft (39) being connected, also by a coupling (40), to a support (41) integral with the fixed pump body (13, 14). Device for removing sediments deposited on the sea, river or lake bottom, mounted on a machine comprising a strainer (46), one end of which intended to be submerged is equipped with a strainer (44), and at least one motor pump ( 1) connected to said elind (46) capable of entraining said sediment through the elind (46) characterized in that it comprises at least one motor pump according to any one of claims 1 to 12, connected to the rope (46) near its submerged end, its axis of rotation coinciding with the axis of the rope (46) in such a way that the pumped materials do not undergo an axial change of direction when going up towards the other end of the 'elinde (46).

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