US20170152865A1

US20170152865A1 - Filtration pump for a swimming pool

Info

Publication number: US20170152865A1
Application number: US15/321,063
Authority: US
Inventors: Michael LIE
Original assignee: ACIS (AQUA CONSULT INDUSTRIE SERVICES)
Current assignee: ACIS (AQUA CONSULT INDUSTRIE SERVICES)
Priority date: 2014-06-23
Filing date: 2015-06-23
Publication date: 2017-06-01
Also published as: CN107075864A; AU2015278981A1; CN107075864B; EP3158146B1; ES2676494T3; PT3158146T; FR3022575B1; CA2953052A1; EP3158146A1; BR112016030296A2; FR3022575A1; WO2015197967A1; TR201809260T4

Abstract

Disclosed is a filtration pump for a swimming pool, including a pump body suitable for resting on a horizontal support, the pump body has a suction port extended by a cylindrical suction structure with a horizontal axis, and a discharge port, extended by a cylindrical discharge structure with a vertical axis. The pump body allows adjustment:

- of the dimension corresponding to the height of the horizontal axis of the cylindrical suction structure, relative to the support,
- of the dimension corresponding to the height of the horizontal plane of the free end of the cylindrical discharge structure relative to the support, and
- of the dimension corresponding to the distance separating the vertical plane of the free end of the cylindrical suction structure and the vertical axis of the cylindrical discharge structure,
  and this continuously, each over a range of values and regardless of the others.

Description

TECHNICAL FIELD THAT THE INVENTION IS RELATED TO

The present invention concerns the general field of swimming pool equipment; it particularly concerns the filtration pumps for swimming pools.

TECHNOLOGICAL BACKGROUND

Recycling the water of a swimming pool, especially for the purpose of its filtration, is done by means of electric pumps.
These filtration pumps comprise a pump body associated with an electric motor provided with a paddle wheel. This pump body is provided with a suction port which comprises means for allowing it to be coupled to a suction coupling of a water inlet piping and with a discharge port which comprises means for allowing it to be coupled to a discharge coupling of a water outlet piping. The water circuit between the swimming pool and the pump comprises a filtering installation, for example of the sandbox-filter type.
There are numerous models of such pumps (cf. for example EP-2 113 705 or EP-0 544 610), but in a very general manner, their body comprises a base for positioning it and for fixing it on a dedicated flat horizontal support; the axis of their suction port is horizontal and provided at the front side of the pump body facing a lodging space for a pre-filtering system (traditionally a removable basket constituting a pre-filter), and their discharge port is provided on top of the pump body with its axis being vertical.
The horizontal axis of the suction port and the vertical axis of the discharge port extend generally in the same vertical plane (corresponding to the median vertical plane of the pump body).
The differences between the pump models existing on the market lie especially in the types of means for connection to the suction coupling and to the discharge coupling of the inlet piping and outlet piping, as well as in the positioning dimensions of the suction port and of the discharge port, i.e.

- the height dimension of the axis of the suction port,
- the height dimension of the horizontal plane of the discharge port, and
- the length/distance dimension between the axis of the discharge port and the vertical plane of the suction port;
  these different dimensions of positioning being liable to vary by some millimeters or some centimeters from one pump model to another.

During a first installation, the installer constructs the piping plan taking into account the chosen pump model.
Then, when it is necessary to change the pump, the operator has to do that change with an identical pump; or, when he uses a different pump model, he has to modify the positioning of the suction coupling and the discharge coupling of the water inlet piping and the water outlet piping, which causes supplemental cost of time and of material.

OBJECT OF THE INVENTION

The present invention aims at overcoming these disadvantages by suggesting a very versatile pump structure suitable for being configured for being coupled in a simple and rapid manner to existing suction and discharge couplings, whatever be a large part of the previously used pump models.
To this end, that versatile filtration pump for a swimming pool is of the type comprising a pump body suitable for resting on a horizontal support, said pump body comprising a lodging space for a pre-filtering system, as well as means for receiving a motor, and it is provided with:

- a suction port, said suction port being positioned facing the lodging space for the pre-filtering system, and being extended by a cylindrical suction structure with a horizontal axis, the free end of which extends in a vertical plane P1 and is provided with means for being coupled to a suction coupling, and
- a discharge port, said discharge port being extended by a cylindrical discharge structure with a vertical axis, the free end of which extends in a horizontal plane P2 and is provided with means for being coupled to a discharge coupling;

the horizontal axis of said cylindrical suction structure is intended to extend according to a height dimension C1 with respect to said horizontal support of said pump body;
the horizontal plane P2 of the free end of the cylindrical discharge structure is intended to extend according to a height dimension C2 with respect to said horizontal support; and the vertical plane P1 of the free end of the cylindrical suction structure and the vertical axis of said cylindrical discharge structure are separated by a length dimension C3.
On the other hand, the axes of said cylindrical suction structure and discharge structure are situated in the same vertical plane P3.
And according to the present invention, for obtaining the desired versatility, the pump body comprises means allowing the adjustment of said height dimension C1, means allowing the adjustment of said height dimension C2, and means allowing the adjustment of said length dimension C3, continuously, each over a range of values and regardless of the others.
According to a preferred embodiment, the cylindrical discharge structure comprises a cylindrical discharge coupling mounted with the possibility of axial mobility through an annular gasket associated to said discharge port, for allowing the adjustment of the afore-mentioned height dimension C2.
The cylindrical discharge structure preferably comprises compression means for compressing in a reversible manner said gasket between the circumference of said discharge port and the outer surface of the cylindrical discharge coupling, in order to achieve simultaneously the axial locking of said cylindrical discharge coupling and the tightness.
Still in this context, according to a specific form of embodiment, the discharge port of the pump body extends to the outside by a cylindrical discharge section provided with a tapping, the inner diameter of said cylindrical discharge section being greater than the diameter of said discharge port for providing an inner shoulder oriented to the outside; further, the afore-mentioned compression means comprises a clamping nut intended to surround said cylindrical discharge coupling and provided with an extension comprising an outer thread intended to cooperate with said tapping of the cylindrical discharge section in an appropriate manner in order that its free end compresses directly or indirectly said gasket against said inner shoulder and against the outer surface of said cylindrical discharge coupling.
Preferably, a conical and open compression ring is located between said gasket and an inclined surface formed in the inner surface of the clamping nut.
On the other hand, still in an advantageous manner, the cylindrical discharge section of said discharge port is integrally formed, i.e. as one piece, with the pump body.
According to another special feature, the cylindrical suction structure comprises a cylindrical suction coupling mounted with the possibility of axial mobility through an annular gasket associated to said suction port, for allowing the adjustment of said afore-mentioned length dimension C3.
In this context, the cylindrical suction structure preferably comprises compression means for compressing in a reversible manner said gasket between the circumference of said suction port and the outer surface of said cylindrical suction coupling, in order to achieve simultaneously the axial locking of said cylindrical suction coupling and the tightness.
The suction port of the pump body preferably extends to the outside by a cylindrical suction section provided with a tapping, the inner diameter of said cylindrical suction section being greater than the diameter of said suction port for providing an inner shoulder oriented to the outside. Further, said compression means comprises a clamping nut intended to surround said cylindrical suction coupling and provided with an extension comprising an outer thread intended to cooperate with said tapping of the cylindrical suction section, in an appropriate manner in order that its free end compresses, directly or indirectly, said gasket against said inner shoulder and against the outer surface of said cylindrical suction coupling.
Still preferably, a conical and open compression ring is located between said gasket and an inclined surface formed in the inner surface of said clamping nut.
According to yet another specific feature, the suction port formed in the pump body is designed oversized in relation to the diameter of said cylindrical suction structure; on the other hand, the pump comprises an intermediate plate carrying said cylindrical suction structure, said intermediate plate comprising holes for being fixed to the pump body by means of screws, said fixing holes having an elongate shape the major axis of which is oriented parallel to the plane P3 and to the axis of the cylindrical discharge structure, for allowing the adjustment of the afore-mentioned height dimension C1.
Said intermediate plate preferably comprises a suction port which extends by said cylindrical suction section associated to said cylindrical suction coupling and said compression means.
The cylindrical suction coupling and discharge coupling advantageously comprise a tapped end or a threaded end for being coupled respectively to the suction coupling and to the discharge coupling.
On the other hand, the cylindrical suction coupling and discharge coupling preferably comprise a peripheral protruding structure having a polygonal cross-section for holding them during screwing and unscrewing operations of the suction coupling and the discharge coupling, and optionally of the associated clamping nuts.

The present invention will be further illustrated, without being limited in any way, by the following description of a specific embodiment, merely given as an example and shown on the accompanying drawings, in which:

FIG. 1 is a perspective view of a filtration pump for a swimming pool, according to the invention, formed by a pump body associated to an electric motor;

FIG. 2 is a front view of the pump body shown on FIG. 1;

FIG. 3 is a side view of the pump body of FIG. 2;

FIG. 4 is a cross-sectional view of the pump body along the cross-section plane 4-4 of FIG. 2;

FIG. 5 is an enlarged view of a part of FIG. 4, showing in detail the coupling means of the discharge port to the discharge coupling;

FIG. 6 is an enlarged view of a part of FIG. 4, showing in detail the means for coupling the suction port to the suction coupling;

FIG. 7 is an exploded perspective view of the means for coupling the suction port to the suction coupling.

DETAILED DESCRIPTION OF AN EMBODIMENT

FIG. 1 illustrates in a perspective view a filtration pump 1 according to the invention, comprising a pump body 2 associated to an electric motor 3 (shown by a dashed line), e.g. an asynchronous two-pole motor of 1.1 kW. On FIGS. 2, 3, and 4, only the pump body 2 is shown.
That pump body 2 comprises a base 4 allowing it to be fixed on a horizontal support S by means of screws.
It comprises an essentially cylindrical front structure 5 having a vertical axis, being open at the upper part, and provided, at that level, with a removable closing hood 6. That cylindrical front structure 5 defines a lodging space 7 intended for receiving a not shown filtration system forming a pre-filter for retaining certain waste/debris from the swimming-pool water, in order to protect the paddle wheel of the electric motor 3.
That cylindrical front structure 5 of the pump body 2 is extended by a rear structure 8, likewise essentially cylindrical, having a horizontal axis and defining the pumping chamber 9 as such, intended for receiving the conical diffuser and the paddle wheel of the electric motor 3. That rear structure 8 is also adapted for allowing the electric motor 3 to be fixed.
The cylindrical front and rear structures 5 and 8 of the pump body 2 are in fluid communication with each other by means of an inner opening 10.
The pump body 2 comprises a suction port 11 having a horizontal axis 12, which is formed in the cylindrical front structure 5 facing the lodging space 7 for the pre-filtering system; that suction port 11 extends by a cylindrical suction structure 13 having a horizontal axis 13′, the free end 14 of which is provided with means 15 for being coupled to a suction coupling RA. That suction coupling RA, simply shown on FIG. 1 by a dashed line, is an integral part of the piping circuit between the swimming pool and the pump 1.
As can be seen on FIGS. 1 and 4, the free end 14 of that cylindrical suction structure 13 extends in a vertical plane P1.
On the other hand, the height dimension of the horizontal axis 13′ of the cylindrical suction structure 13 with respect to the horizontal support S of the pump body 2 is referenced Cl on FIG. 4.
The pump body 2 further comprises a circular discharge port 16, having a vertical axis 17, which is formed in the upper part of the rear structure 8; that discharge port 16 extends by a cylindrical discharge structure 18, having a vertical axis 18′, the free end 19 of which is provided with means 20 for being coupled to a discharge coupling RF.
Here, the vertical axes 17 and 18′ are merged with one another.
As can be seen on FIGS. 1 and 4, the free end 19 of that cylindrical discharge structure 18 extends in a horizontal plane P2; and the horizontal plane P2 is situated at a height dimension C2 with respect to the horizontal support S of the pump body 2 (FIG. 4).
On the other hand, still on FIG. 4, one remarks that the vertical plane P1 of the cylindrical suction structure 13 is separated from the vertical axis 18′ of the cylindrical discharge structure 18 by a length dimension C3.
Further, one also remarks that the horizontal axis 13′ of the cylindrical suction structure 13, and the axis 18′ of the cylindrical discharge structure 18, are placed on the same vertical plane P3, corresponding to the median vertical plane of the pump body 2 (FIG. 2).
According to the invention, the pump body 2 comprises means described hereafter in more details, which allows the adjustment of the afore-mentioned dimensions C1, C2, and C3, and that in a continuous manner, each over a range of values and regardless of the others.
To that end, in the illustrated example, and as is shown in details on FIG. 5, the cylindrical discharge structure 18 comprises a cylindrical discharge coupling 21 which is mounted with the possibility of axial mobility through an annular gasket 22 associated to the discharge port 16.
That cylindrical discharge structure 18 is associated to compression means 23 adapted for compressing the gasket 22 in a reversible manner, between the circumference of the discharge port 16 and the outer surface of the cylindrical discharge coupling 21, in order to produce simultaneously the axial locking of that cylindrical coupling 21 and the tightness.
More precisely, the discharge port 16 formed in the pump body 2 extends to the outside by a cylindrical discharge section 24, formed here in a single piece, which is provided with a tapping 25, and the inner diameter of which is greater than the diameter of the discharge port 16, in order to obtain an inner shoulder 26 oriented to the outside.
Further, the afore-mentioned compression means 23 comprises a clamping nut 27 intended to surround the cylindrical discharge coupling 21 and provided with an extension 28 comprising an outer thread 29 adapted for cooperating with the tapping 25 of the cylindrical discharge section 24 in an adapted or appropriate manner, in order that its free end compresses the gasket 22 against the afore-mentioned shoulder 26, and against the outer surface of the cylindrical discharge coupling 21, and this by means of a conical clamping ring 30.
That conical ring 30, preferably of the “open” type (which means: not continuous), is independent from the clamping nut 27, and it is interposed between the annular gasket 22 and an inclined surface 31 formed in the inner surface of the clamping nut 27.
The outer diameter of the cylindrical discharge coupling 21 corresponds, except for the clearance, to the inner diameter of the clamping nut 27, of the clamping ring 30 before compression, of the annular gasket 22 before compression, and of the port 16 formed in the wall of the pump body 2.
Thus, it is understood that before complete compression of the nut 27, the cylindrical discharge coupling 21 can slide axially along the axis 18′, and this in a continuous manner, over a defined range of values, thanks to the cooperation of smooth surfaces sliding one over the other; and after having adjusted the desired height dimension C2 of the horizontal plane P2 (especially as a function of the positioning of the discharge coupling RF), this dimension C2 can be locked by the clamping nut 27.
During that clamping of the nut 27 on the cylindrical discharge section 24, the tapping 25 cooperates with the thread 29. The extension 28 of the nut 27 pushes the conical ring 30 (by the inclined surface 31) towards the pump body 2, and the conical ring 30 compresses the gasket 22 against the shoulder 26 and against the outer surface of the cylindrical coupling 21, in order to lock the position of the latter and to assure the tightness of the connection (the locking and the tightness being achieved by the ring 30 and the gasket 22).
The open conical ring 30 allows to optimize the features of the clamping.
At the free end 19 of the cylindrical coupling 21, one remarks the presence of the means 20 for the coupling to the discharge coupling RF, here as a tapping.
On the periphery of the outer face of the cylindrical discharge coupling 21, one further remarks the presence of a protruding polygonal structure 32 (in the present case: hexagonal), which allows to maintain said cylindrical coupling (for example by means of a wrench or of pliers) during screwing and unscrewing operations of the nut 27 and the discharge coupling RF. That protruding polygonal structure 32 is located on the side of the free end 19 of the cylindrical coupling 21.
On the other hand, at the front part 5 of the pump body 2, as shown in details on FIGS. 6 and 7, the cylindrical suction structure 13 has a structure which is similar to that of the cylindrical discharge structure 18, except for the fact that it comprises an intermediate plate 33 allowing it to be fixed on the pump body 2, that intermediate plate 33 being conceived for being adjustable in height (for allowing an adjustment of the height dimension C1), and the suction port 11 being oversized with respect to the diameter of the cylindrical suction structure 13, again for allowing that adjustment of the height dimension C1.
To this end, the suction port 11 formed in the pump body 2 is of generally elongate shape, its major axis being oriented vertically, parallel to the axis 18′ of the cylindrical discharge structure 18, and in the median vertical plane P3 of the pump body 2.
As to the intermediate plate 33, it has a generally square or rectangular shape and it comprises elongate holes 34 allowing it to be fixed on the outer surface of the front part 5 of the pump body 2, facing the suction port 11 and against a receiving location 35 formed to that end.
That mounting of the intermediate plate 33 is done by means of screws 36 which cooperate with tapped holes formed at that location 35 of the pump body 2, on the periphery of the suction port 11.
The major axis of the elongate holes 34 extends vertically, parallel to the major axis of the suction port 11, in order to allow the desired vertical adjustment of the intermediate plate 33, and this in a continuous manner and over a range of values (corresponding to the mobility range of the screws 36 along the elongate holes 34).
In a manner similar to the cylindrical discharge structure 18, the cylindrical suction structure 13 comprises a cylindrical suction coupling 37 which is mounted with the possibility of axial mobility (along the horizontal axis 13′) through an annular gasket 38 associated to an opening 39 formed in the intermediate plate 33 (placed corresponding to the suction port 11 and liable to be assimilated to the latter).
The diameter of the opening 39 corresponds roughly to the inner diameter of the cylindrical suction coupling 37 as well as to the minor axis of the suction port 11.
Further, that cylindrical suction structure 13 is associated to compression means 40 adapted for compressing the gasket 38 in a reversible manner between the periphery of the suction port 11-39 and the outer surface of the cylindrical suction coupling 37, in order to produce simultaneously the axial locking of the cylindrical coupling 37 et the tightness.
More precisely, the suction opening 39 formed in the intermediate plate 33 extends, on the side of the outer face 33 a of said plate 33, by a cylindrical suction section 41 which is provided with a tapping 42 and the diameter of which is greater than the inner diameter of the opening 39, in order to form an inner shoulder 43 oriented to the outside.
As to the compressions means 40, it comprises a clamping nut 44 intended to surround the cylindrical suction coupling 37 and which is provided with an extension 45 comprising an outer thread 46 adapted for cooperating with said tapping 42 of the cylindrical suction section 41, in an appropriate manner in order that its free end compresses the gasket 38 against the afore-mentioned shoulder 43 and against the outer surface of said cylindrical suction coupling 37, and this by means of a conical clamping ring 47.
That conical ring 47, preferably of the “open” type (i.e. not continuous), is independent from the clamping nut 44 and it is interposed between the annular gasket 38 and an inclined surface 48 formed in the inner surface of the nut 44.
The outer diameter of the cylindrical suction coupling 37 corresponds, except for the clearance, to the inner diameter of the clamping nut 44, of the clamping ring 47 before compression, of the annular gasket 38 before compression, and of the opening 39 formed in the intermediate plate 33.
Thus, one understands that, before complete clamping of the nut 44, the cylindrical suction coupling 37 can slide axially along the axis 13′ and in a continuous manner, over a range of determined values, thanks to the cooperation of smooth surfaces sliding over one another; and after having adjusted the desired distance dimension C3 of the vertical plane P1, that dimension C3 can be locked by clamping the nut 44.
During that clamping of the nut 44 on the cylindrical suction section 37, the tapping 42 cooperates with the thread 46; the extension 45 of the nut 44 pushes the conical ring 47 (by the inclined surface 48) towards the pump body 2, and the conical ring 47 compresses the gasket 38 against the shoulder 43 and against the outer surface of the cylindrical coupling 37, in order to lock the position of the latter and to ensure the tightness of the connection (the locking and the tightness being achieved by the ring 47 and the gasket 38).
There again, the open conical ring 47 allows to optimize the features of the clamping.
At the free end 14 of the cylindrical suction coupling 37, one remarks the presence of means 15 for the coupling of the suction coupling RA, here as a thread.
On the periphery of the outer face of the cylindrical suction coupling 37, one remarks, here as well, the presence of a protruding polygonal structure 49 (in the present case: hexagonal), which allows to maintain said cylindrical coupling 37 (for example by means of a wrench or of pliers) during screwing and unscrewing operations of the nut 44 and the suction coupling RA.
That protruding polygonal structure 49 is located on the side of the free end 14 of the cylindrical suction coupling 37.
A gasket 50 assures the tightness of the mounting of the plate 33 on the location 35 of the pump body 2. That gasket 50 is placed in an adapted groove 51 formed at the rear face 33 b of the plate 33 (intended to be placed facing the location 35 of the pump body 2).
The groove 51 and the gasket 50 extend over the periphery of the opening 39.
According to a variant of the embodiment, that groove and the gasket which it receives, may be arranged at the location 35 of the pump body 2.
One understands that the elongate holes 34 for mounting the intermediate plate 33 allow an adjustment of the height dimension Cl of the axis 13′ of the cylindrical suction coupling 37.
Such a filtration pump 1 allows the adjustment of the dimensions C1, C2, and C3 independently from one another, and this in a continuous manner, and each over a range of values, what allows it to be installed on numerous existing configurations of suction couplings RA and discharge couplings RF.
The mounting of the ends of the suction coupling 37 and the discharge coupling 21 (tapping or thread 15, 20) are adapted to the suction coupling RA and the discharge coupling RF as existing at the site.
The tappings or threads 15, 20 may, for example, be of the tapped 1½″ or 2″ type, of the threaded 2¼″ or 2¾″ type, and so on.
Optionally, the commercialized pump 1 may be associated to a plurality of types of suction couplings 37 and discharge couplings 21 to be used according to the existing type of RA and RF coupling.
Several types of plates 33 with a different positioning of the opening 39 may also be proposed, to be used according to the desired dimension C1. That or those plates 33 may be designed for being pivoted by 180°, in order to increase the possibilities of adjustment.
As a variant, the cylindrical suction section 41 may be formed integrally, i.e.in one piece, with the pump body 2, as well as the cylindrical discharge section 24. In this case, the cylindrical suction structure 13 does not comprise any intermediate plate 33. The adjustment of the height dimension C1 can then be performed by height-adjustment means of the pump body 2, for example by height-adjustable feet.
Still as a variant, the end of the clamping nuts 27 and 44 may be adapted for assuring the direct compression of the gaskets 22 and 38.

Claims

1-14. (cancelled)

15. Filtration pump (1) for a swimming pool comprising a pump body (2) suitable for resting on a horizontal support (S), said pump body (2) comprising a lodging space (7) for a pre-filtering system as well as means for receiving a motor (3), and is provided with

a suction port (11, 39), said suction port (11, 39) being positioned facing the lodging space (7) for the pre-filtering system, and being extended by a cylindrical suction structure (13) with a horizontal axis (13′), the free end (14) of which extends in a vertical plane (P1) and is provided with means (15) for being coupled to a suction coupling (RA), and

a discharge port (16), said discharge port (16) being extended by a cylindrical discharge structure (18) with a vertical axis (18′), the free end (19) of which extends in a horizontal plane (P2) and is provided with means (20) for being coupled to a discharge coupling (RF),

the horizontal axis (13′) of said cylindrical suction structure (13) being intended to extend according to a height dimension (C1) with respect to said horizontal support (S) of said pump body (2),

said horizontal plane (P2) of the free end (19) of the cylindrical discharge structure (18) being intended to extend according to a height dimension (C2) with respect to said horizontal support (S),

said vertical plane (P1) of the free end (14) of the cylindrical suction structure (13) and said vertical axis (18′) of the cylindrical discharge structure (18) being separated by a length dimension (C3),

and said axes (13′, 18′) of said cylindrical suction structure and discharge structure (13, 18) being situated in the same vertical plane (P3),

wherein said pump body (2) comprises means (11, 33, 34, 39) allowing the adjustment of said height dimension (C1), means (16, 18, 21, 22) allowing the adjustment of said height dimension (C2), and means (11, 13, 37, 38, 39) allowing the adjustment of said length dimension (C3), continuously, each over a range of values and regardless of the others.

16. Filtration pump (1) according to claim 15, wherein said cylindrical discharge structure (18) comprises a cylindrical discharge coupling (21) mounted with the possibility of axial mobility through an annular gasket (22) associated to said discharge port (16) for allowing the adjustment of the height dimension (C2).

17. Filtration pump (1) according to claim 16, wherein said cylindrical discharge structure (18) comprises compression means (23) for compressing in a reversible manner said gasket (22) between the circumference of said discharge port (16) and the outer surface of said cylindrical discharge coupling (21), in order to achieve simultaneously the axial locking of said cylindrical discharge coupling (21) and the tightness.

18. Filtration pump (1) according to claim 17, wherein said discharge port (16) of the pump body (2) extends to the outside by a cylindrical discharge section (24) provided with a tapping (25), the inner diameter of said cylindrical discharge section (24) being greater than the diameter of said discharge port (16) for providing an inner shoulder (26) oriented to the outside, and wherein said compression means (23) comprises a clamping nut (27) intended to surround said cylindrical discharge coupling (21) and provided with an extension (28) comprising an outer thread (29) intended to cooperate with said tapping (25) of said cylindrical discharge section (24), in an appropriate manner in order that its free end compresses directly or indirectly said gasket (22) against said inner shoulder (26) and against the outer surface of said cylindrical discharge coupling (21).

19. Filtration pump (1) according to claim 18, further comprising a conical and open compression ring (30) located between said gasket (22) and an inclined surface (31) formed in the inner surface of said clamping nut (27).

20. Filtration pump (1) according to claim 18, wherein said cylindrical discharge section (24) of the discharge port (16) is formed as one piece with the pump body (2).

21. Filtration pump (1) according to claim 15, wherein said cylindrical suction structure (13) comprises a cylindrical suction coupling (37) mounted with the possibility of axial mobility through an annular gasket (38) associated to said suction port (11, 39), for allowing the adjustment of said length dimension (C3).

22. Filtration pump (1) according to claim 21, wherein said cylindrical suction structure (13) comprises compression means (40) for compressing in a reversible manner said gasket (38) between the circumference of said suction port (11, 39) and the outer surface of said cylindrical suction coupling (37) in order to achieve simultaneously the axial locking of said cylindrical suction coupling (37) and the tightness.

23. Filtration pump (1) according to claim 22, wherein said suction port (11, 39) of the pump body (2) extends to the outside by a cylindrical suction section (41) provided with a tapping (42), the inner diameter of said cylindrical suction section (41) being greater than the diameter of said suction port (11, 39) for providing an inner shoulder (43) oriented to the outside, and wherein said compression means (40) comprises a clamping nut (44) intended to surround said cylindrical suction coupling (37) and provided with an extension (45) comprising an outer thread (46) intended to cooperate with said tapping (42) of said cylindrical suction section (41), in an appropriate manner in order that its free end compresses, directly or indirectly, said gasket (38) against said inner shoulder (43) and against the outer surface of said cylindrical suction coupling (37).

24. Filtration pump (1) according to claim 23, further comprising a conical and open compression ring (47) located between said gasket (38) and an inclined surface (48) formed in the inner surface of said clamping nut (44).

25. Filtration pump (1) according to claim 15, further comprising a suction port (11) formed in the pump body (2), being oversized in relation to the diameter of said cylindrical suction structure (13), and an intermediate plate (33), carrying said cylindrical suction structure (13), said intermediate plate (33) comprising holes (34) for being fixed to the pump body (2) by means of screws (36), said fixing holes (34) having an elongate shape the major axis of which is oriented parallel to said plane (P3) et to said axis (18′) of the cylindrical discharge structure (18), for allowing the adjustment of said height dimension (C1).

26. Filtration pump (1) according to claims 23, further comprising a suction port (11) formed in the pump body (2), being oversized in relation to the diameter of said cylindrical suction structure (13), and an intermediate plate (33), carrying said cylindrical suction structure (13), said intermediate plate (33) comprising holes (34) for being fixed to the pump body (2) by means of screws (36), said fixing holes (34) having an elongate shape the major axis of which is oriented parallel to said plane (P3) et to said axis (18′) of the cylindrical discharge structure (18), for allowing the adjustment of said height dimension (C1); wherein said intermediate plate (33) comprises a suction port (39) which extends by said cylindrical suction section (41) associated to said cylindrical suction coupling (37) and said compression means (40).

27. Filtration pump (1) according to claim 15, wherein said cylindrical suction coupling (37) and discharge coupling (21) comprise a tapped end (20) or a threaded end (15) for being coupled respectively to the suction coupling (RA) and to the discharge coupling (RF).

28. Filtration pump (1) according to claim 15, wherein said cylindrical suction coupling (37) and discharge coupling (21) comprise a peripheral protruding structure (32, 49) having a polygonal cross-section, for holding them during screwing and unscrewing operations of the suction coupling (RA) and the discharge coupling (RF).

29. Filtration pump (1) according to claim 19, wherein said cylindrical discharge section (24) of the discharge port (16) is formed as one piece with the pump body (2).

30. Filtration pump (1) according to claim 28, wherein said peripheral protruding structure also holds the cylindrical suction coupling and the discharge coupling during screwing and unscrewing operations of of the associated clamping nuts (24, 44).