EP0454529A1 - Vertical centrifugal pump module - Google Patents

Vertical centrifugal pump module Download PDF

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Publication number
EP0454529A1
EP0454529A1 EP91400981A EP91400981A EP0454529A1 EP 0454529 A1 EP0454529 A1 EP 0454529A1 EP 91400981 A EP91400981 A EP 91400981A EP 91400981 A EP91400981 A EP 91400981A EP 0454529 A1 EP0454529 A1 EP 0454529A1
Authority
EP
European Patent Office
Prior art keywords
pump
suction
bore
flange
central
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91400981A
Other languages
German (de)
French (fr)
Other versions
EP0454529B1 (en
Inventor
Jean-Claude Peu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilo Salmson France SAS
Original Assignee
Pompes Salmson SAS
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Filing date
Publication date
Application filed by Pompes Salmson SAS filed Critical Pompes Salmson SAS
Publication of EP0454529A1 publication Critical patent/EP0454529A1/en
Application granted granted Critical
Publication of EP0454529B1 publication Critical patent/EP0454529B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0077—Safety measures
    • F04D15/0083—Protection against sudden pressure change, e.g. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • F04D1/066—Multi-stage pumps of the vertically split casing type the casing consisting of a plurality of annuli bolted together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/029—Stopping of pumps, or operating valves, on occurrence of unwanted conditions for pumps operating in parallel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7879—Resilient material valve
    • Y10T137/7888—With valve member flexing about securement
    • Y10T137/789—Central mount
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/86131—Plural
    • Y10T137/86163—Parallel

Definitions

  • the present invention relates to a vertical centrifugal pump assembly, in particular a multicellular centrifugal pump, consisting of at least one removable cartridge of a centrifugal hydraulic assembly forming a block clamped between two flange flanges and mounted on a vertical axis, fixed by its flange flange, and engaged by a flange sleeve in a bore receiving a pump body where the cartridge is connected, respectively, at the center of the bore, to a central suction connection of the pump and, to the edge of the bore, at a discharge outlet of the pump.
  • the present invention aims in particular to allow the isolation of the hydraulic assembly cartridge using a simple check valve which does not change the design and economy of the pump assembly. These arrangements prove to be particularly advantageous in the case of multiple pumps mounted on a single pump housing.
  • a flat annular non-return valve and opening in the direction of delivery of the pump is disposed at the bottom of the receiving bore between the inner wall of said bore and the outer wall of the connector. central vacuum.
  • the non-return valve is held in axial position on a first shoulder formed at the bottom of the receiving bore and on a second shoulder formed on the outer wall of the central connector of suction, by retaining means capable of keeping the non-return valve in service against the discharge pressure, after removal of the removable cartridge from the hydraulic assembly.
  • the non-return valve advantageously consists, on the one hand, of a rigid flat annular plate, for example of metal, pierced with at least one through hole and the external cylindrical periphery of which is substantially adjusted in the bore while that its front periphery is supported on a first shoulder formed at the bottom of the receiving bore and, on the other hand, of a flat flexible ring applied to said annular plate, on the side opposite to the removable cartridge, to the inside the pump body, for closing the passage hole (s), said flexible ring being in abutment, at its inner peripheral part, on a second flat annular shoulder formed on the outer wall of the central suction fitting.
  • the planar flexible ring generally consists of an elastomer washer maintained applied to the rigid plate by a rigid central retaining ring, interposed between the flexible ring and the second shoulder, said central ring having an outer diameter markedly lower than that on which the passage hole or holes are arranged.
  • the planar flexible ring is constituted by a thin circular plate provided with a central hole and radial slots open towards the outside and which extend up to a continuous crown formed around the central hole , so as to constitute a series of lamella valves arranged radially, each facing at least one of the through holes.
  • the flat annular plate is held in abutment on the first and on the second shoulders, respectively by a first elastic ring or "circlips” housed in a groove made in the wall of the bore receiving and by a second elastic ring or “circlips” housed in a groove formed on the outer cylindrical wall of the central suction connection.
  • the flat annular plate is held in abutment on the first and on the second shoulders by the front support, on the one hand, at its outer periphery outside the area of the hole or holes, a first annular bearing formed on an end sleeve of the lower flange of said removable cartridge, engaged in the receiving bore and, on the other hand, to its outer periphery, a second annular bearing formed on the central suction connection of the lower flange of the removable cartridge.
  • the flat annular plate is held in abutment on the first and on the second shoulders by the front support, on the one hand, at its outer periphery, outside the area of the through holes of a first annular bearing surface of an end sleeve of a retaining flange, identical or similar to the lower flange of said removable cartridge, engaged in the receiving bore and, on the other hand, at its inner periphery, of a second annular bearing formed on the central suction connection of said retaining flange which comprises a bore for receiving the sleeve of the lower flange of the removable cartridge.
  • the present invention also relates to pumping units with at least two vertical centrifugal pumps, with removable hydraulic cartridge, mounted on a common suction and discharge casing, said pumps being capable of operating simultaneously and / or separately.
  • each vertical pump is constituted by a centrifugal pump assembly provided with a non-return valve according to the arrangements which have just been described.
  • the common casing may include an integrated distributor valve for the suction of the pumps, with four positions corresponding respectively: to the isolation of the suction of the two pumps, to the connection of the two pumps to the suction and at the connection to the suction of one of the two pumps while the other pump is isolated, so that after isolation of the suction of one of the pumps while the other remains in service, the insulated pump assembly cartridge can be removed by being isolated from the discharge pressure by the non-return valve.
  • the common casing may comprise, for each vertical centrifugal pump, a valve with two positions: opening and respectively closing of the suction of the pump, capable of to be controlled independently for each pump which is fitted with an integrated non-return valve capable of isolating it from the common delivery.
  • FIGS. 1 and 2 show a vertical multicellular pump with removable cartridge 1 of the centrifugal type, driven in rotation by a motor not shown, fixed above a support flange and connected to the pump rotor by a coupling 2 (partially shown in Figure 2) and a pump shaft 3.
  • the stages of the pump (here it is a five-stage pump) each consist of a rotor or pump wheel keyed or otherwise mounted on the shaft 3 and a stator forming a diffuser for recovering the kinetic energy transmitted to the liquid to transform it into pressure and bring the pumped liquid to the next downstream stage.
  • the assembly 4 of the stacked pump stages is inserted with its bearings in a tube 5 resistant to pressure and also to corrosion (made for example of stainless steel) and which is closed at each end, respectively by an upper flange 6 and by a lower flange 7.
  • the upper flange 6 is closed by a cover 8 which serves as a support for the electric drive motor (not shown) and comprises a flange 9 provided with a ring of holes for bolts or tightening rods 10 of the two flanges 6 and 7.
  • the lower flange 7 has an outer flange 11 pierced with a series of holes allowing the alternating passage of the bolts 10 and screws 12 for fixing the lower flange 7 on a pump body 13 come, in general , foundry and provided with a ring of threaded holes 14 for fixing around a bore 15 for receiving a sleeve 16 of the lower flange 7.
  • the flanges 6 and 7 each have a recess bore tight eption of the tube 5 thanks to O-rings 5a and 5b, each housed in a groove formed on the wall of the bore.
  • the lower flange 7 is stopped axially by a shoulder 17 which comes to bear on the flat upper face 17a formed at the outlet of the bore 15, perpendicular to the threaded holes 14.
  • the lower flange 7 has a central part 18 provided with peripheral passages 19 which are formed between connecting spokes to the flange 11 and are connected to an annular passage 20 formed inside the tube 5 between the outlet of the last stage of the pump and stacking 4 floors.
  • the central part 18 forms at its center a central suction connection 21 leading to the threaded or tapped suction opening 22 of the pump body 13.
  • the bore 15 opens onto an opening 23 formed inside the pump body 13 and connected to the threaded or tapped outlet outlet 24 and the bore 15 stops on a first annular shoulder 25 plane and perpendicular to the bore.
  • a flat annular non-return valve 26 is disposed at the bottom of the bore 15, bearing on the shoulder 25.
  • the non-return valve 26 which opens in the direction of discharge of the pump thus cuts the flow of peripheral passages 19 towards the discharge outlet 24.
  • the valve 26 here consists of a fairly rigid flat annular plate 27, for example of steel with a thickness of the order of 5 mm, and ground evenly flat on both sides to properly adjust and bear on the flat surface of the shoulder 25.
  • the outer cylindrical surface of the plate 27 can be adjusted with gentle friction in the bore 15 or may have a slight play with respect to this bore.
  • the plate 27 has at least one passage hole 28, more generally a series of passage holes 28 distributed regularly, their axis being placed for example roughly two-thirds outside the width of the plate.
  • the through holes 28 located near a transverse partition 70 isolating them from the intake can be omitted.
  • the face of the plate 27 which looks towards the discharge outlet 24 is covered with a planar flexible ring 29 which closes the through holes 28.
  • the flexible ring 29 is advantageously constituted by an elastomer washer several millimeters thick to resist to the effect of the discharge pressure which the plate on the holes 28.
  • the washer 29 is applied to the face 30 of the plate 27, on the one hand, due to its peripheral support on the side of the opening suction 22 on a shoulder 31 and, on the other hand, in its center, by means of a sheet metal washer 32 bearing on a second shoulder 33 formed around the outer wall of a suction fitting 34 of the pump body 13.
  • the flexible ring 29 can also be constituted by a thin circular plate made of a resistant material, for example made of sheet metal of a resistant metal such as brass or stainless steel.
  • the thin plate 29 ′ of stainless steel is provided with radial slots 29a of constant width or flared towards the exterior as shown in the figure. These outwardly open slots 29a extend to a continuous ring 29b which surrounds a central passage 87 having a diameter slightly greater than the machined outer diameter of the connector 34 above the shoulder 33.
  • a series is thus formed radial strips 29c elastically mounted in cantilever on the crown 29b and which can each close a passage hole 28 (only one of these holes 28 is shown in dotted lines on one of the strips 29c) to produce each, in cooperation with the flat surface of the rigid plate 27, a flap valve capable of withstanding high back pressures without exhibiting wear over time.
  • the rigid plate 27 of the non-return valve 26 is maintained, on the one hand, in direct support on the shoulder 25 by an elastic ring or "circlips" 35 housed in a groove of the bore 15 and, on the other hand, in indirect support via the flexible elastomer washer 29 on the shoulder 33 of the central connector 34 by an elastic ring or "circlips" 36 housed in a groove of the machined cylindrical surface 37 of the suction fitting 34.
  • the cylindrical surface 37 can also be used to guide the corresponding central bore of the plate 27 and of the elastic washer 29.
  • these connectors respectively carry conjugated sleeves 21a and 34a between which is housed an O-ring seal 38.
  • the seal between the rigid plate 27 and the shoulder 33 can be obtained by direct contact or by interposing a flat annular seal between the periphery of the plate 27 and the annular surface of the shoulder 33, which ensures a persistent seal. even when high pressures and / or temperatures prevail at the pump discharge.
  • the sleeves 16 and 21a are extended until they come to bear on the upper surface 27b of the rigid plate 27 under the tightening action of the screws 12.
  • the shoulder 17 is moved back so as not to come to bear on the flat upper face 17a and the extensions of the sleeves 16 and 21a are provided with a recess which surrounds the respective elastic rings 35 and 36, preventing them from coming into contact with the extensions.
  • the ends of these extensions are planar so as to bear well on the upper surface 27b.
  • the extensions of the sleeves 16 and 21a constitute large annular retaining surfaces capable of withstanding, with the plate 27, the high discharge pressures (which can reach several tens of bars in atmospheres sometimes exceeding 200 ° C) which prevail at the discharge outlet 24.
  • the discharge pressure which persists for example due to the connection to a pressure tank, immediately causes the elastic washer 29 to form, forming valve on the rigid plate 27 to close the holes 28. If the removable cartridge 1 has to be replaced, it is sufficient to unscrew the screws 12 after removing the pump drive motor, to remove the sleeve 16 of bore 15. Suction 22 when it is not under pressure produces only minute leaks which stop immediately.
  • the non-return valve 26 remains in position, held by the elastic rings or "circlips" 35 and 36, against the pressure prevailing at the discharge.
  • an O-ring seal 27a may be provided between the chamfered periphery of the annular plate 27 and the intersecting surfaces of the shoulder 25 and the bore 15.
  • the tightening the elastomer of the washer 29 between the plate 27 and the washer 32 guarantees, on the other hand, a certain tightness in the vicinity of the shoulder 33 of the connector 34.
  • the tightness of the non-return valve 26 does not persist for days but at least for several hours, which constitutes sufficient time to proceed with the removal and exchange of the cartridge 1 which is replaced by engagement of the sleeve 16 in the bore 15 followed by tightening of the screws 12 to properly secure the complete hydraulic cartridge 1 to the pump body 13.
  • the present invention proposes the solution shown in FIG. 2 which is less compact but more resistant and easier to adjust while remaining more flexible and more adaptable to existing pump bodies.
  • the elements represented in FIG. 2 and which are identical or similar to those of FIG. 1 have been given the same reference indices.
  • a flange 40 is provided similar or identical to the lower flange 7 of the cartridge 1 and which is fixed to the pump body 13 using a screw crown 12 passing through holes 42 of a flange 41.
  • the holes 42 are alternated on the flange 41 with holes 43 for the passage of longer fixing screws 44 coming to tighten the flange 11 of the flange 7 of the removable cartridge 1.
  • the flange 40 which serves as a flange for holding the non-return valve 26 has an end sleeve 45 which engages, sealingly, in the bore 15 thanks to the seal O-ring seal 39.
  • the sleeve 45 also comes to bear, by a peripheral front ring 47, on a flat peripheral annular zone of the valve plate 27, an O-ring seal 46 being interposed between a chamfer 48 of this front face 47 and, simultaneously anement, the bore 15 and the upper peripheral end face of the plate 27.
  • the central part 18a of the flange 40 comes to bear by a second bearing 49 formed on a central suction connection 21a, on the inner periphery of the plate 27 to press it, sealingly, on the elastomer washer 29 bearing on the shoulder 33 of the central connector 34 of the pump body 13.
  • the central part 18 of the lower flange 7 of the removable cartridge 1 comes in sealed support on the suction connection 34a of the flange 40, in the same way as for the sealed support between the connections 21 and 34 of Figure 1 or, as shown in Figure 2, via an elastomeric sleeve 50 capable of compensating for greater axial deviations.
  • the flange 40 has a bore 51 with an O-ring 52 for receiving the sleeve 16 of the lower flange 7 of the removable cartridge 1. It can be seen that if the bore 5c for receiving the tube 5 is capable of receiving, in an adjusted manner, not only the outer surface of the tube 5, but also the outer surface of the sleeve 16, it is possible to use identical flanges 7 and 40 for the embodiment of Figure 2, which is a big advantage in terms of mass production of pump assembly parts.
  • the non-return valve 26 of the pump is held in position directly by the support of the lower flange 7 on the rigid plate 27.
  • the overall height of the pump is less, but in order to be able to remove the removable cartridge 1, it is necessary to isolate the non-return valve 26 from the delivery beforehand because this valve is no longer held in position after removal of the cartridge 1.
  • This isolation can be carried out at using well-known means such as a non-return valve placed downstream of the discharge outlet 24 or else a cut-off valve.
  • the block with two pumps shown in FIGS. 3 and 4 comprises a foundry casing 60 with base 61 and with two inlets 62 and 63 and two liquid outlets 64 and 65, the unused inlets being closed by threaded plugs 63a and 65a.
  • Two flat bases 66 and 67 for fixing the pump cartridge protrude upwards, surrounding central fluid inlet connections 68 and 69.
  • the bases 66 and 67 have threaded holes 14 on their upper flat face 17a. receiving screws such as screws 12 or 44 shown in Figures 1 and 2 and in Figure 3.
  • a receiving bore 15 similar to that shown in Figures 1 and 2 is provided inside the bases, this bore 15 opening at its periphery on a flat shoulder 25 for receiving the valve plate 27 and, on the side opposite to a partition 70 (also shown in Figures 1 and 2), on a passage 71 towards the discharge.
  • each of the bores 15 is shown, equipped at its bottom end with a non-return valve 26 held in position by a flange 40 fixed by screws 12 on the flat base 66 or 67.
  • Each of the flanges 40 of the same type as that shown in FIG. 2, is ready to receive a removable cartridge 1 of stators and rotors.
  • a valve or a valve 72 for distributing the suction is mounted in a bore 73 open on the outside and closed by a sleeve 74 to allow passage to the outside, from sealingly, an operating handle 75.
  • the tap 72 is mounted on the connection between an intake chamber 76 inside the housing 60 and a channel 77 for distributing the intake to the intake fittings 68 and 69
  • the active part of the tap 72 has two cylindrical ends 78 and 79 serving as a guide in the bore 73 and a hollowed-out central part 80 which provides two passages 81 and 82 to each of the suction fittings 68 and 69.
  • the solid part 84 of flared shape and with vertical central edge 83, of the hollowed-out central part 80 can come to close, by relying on a bearing 85, the passage towards the fitting 68 and, by relying on a bearing 86, the passage to the fitting 69.
  • the solid part 84 simultaneously blocks the admission to the two intake fittings 68 and 69.
  • the block with two pumps 60 When the block with two pumps 60 is in service on a single pump, for example that fixed on the base 66, and this pump is faulty, it is possible to start the other pump, manually or automatically, without risk of backflow on the faulty pump thanks to the non-return valve 26. If you want to change the removable hydraulic cartridge 1 of the faulty pump, simply turn the valve 72 by its operating handle 75 to bring the full part 84 to close the passage to the inlet fitting 68. After removing the removable cartridge, the non-return valve 26 mounted at the bottom of the bore 15 of the base 66 prevents any flow of fluid from the delivery by the other pump then in service, and it is possible to install a new hydraulic cartridge without leaking fluid.
  • the pump After replacing the hydraulic cartridge and its drive motor, the pump can be put back into service to discharge the pumped liquid through the non-return valve 26.
  • the pump unit operates with two pumps in parallel, in in the event of a failure of one of the two pumps, it is possible to switch over to a pump, dismantle the faulty pump without leakage and replace it with a pump in working condition which will then be put back into service to resume operation. works with two pumps.
  • the arrangement of the non-return valve according to the invention makes it possible, in all cases, to have a pumping group which is more compact, more reliable, easier to troubleshoot and therefore more economical.
  • multiple blocks can be provided for more than two vertical pumps in parallel.
  • a suction fitting 90 connected to the common suction leads to a suction inlet 91 formed in a switching block 92 turning in a sealed manner in a bore thanks to at least one annular seal 92a and connected, via a rod sealingly passing through a cover 94, to an external switching lever 95.
  • By rotating the block 92 by action on the lever 95 it is thus possible to isolate the suction of any pump that does not work or on which it is necessary to carry out maintenance or repair.
  • the non-return valve of each pump mounted according to the invention using the rigid plate 27 and the annular washer 29, isolates the common delivery chamber 71, crossed by the rod of the lever 95, from the circuit of the pump stopped or the pump on which a repair or exchange is carried out.
  • the rotary block 92 acts as a valve with two positions: open suction and closed suction, controlled independently for each pump by the external lever 95 or by any other suitable equivalent device, if necessary remote-controlled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
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Abstract

The vertical centrifugal pump module (1) comprises at least one removable canister for the centrifugal hydraulic assembly forming a unit clamped between two end plates (6, 7) with clip (9, 11) and mounted with vertical axis in a receiving bore of a pump body. <??>A flat, annular non-return valve 26 opening in the direction of the delivery of the pump is arranged at the bottom of the receiving bore 15 between the inside wall of the said bore and the outside wall 37 of a central intake connection 34. <??>Application on removable or interchangeable hydraulic canister centrifugal pumps. <IMAGE>

Description

La présente invention se rapporte à un ensemble de pompe centrifuge verticale, notamment de pompe centrifuge multicellulaire, constitué d'au moins une cartouche amovible d'ensemble hydraulique centrifuge formant un bloc serré entre deux flasques à bride et monté à axe vertical, fixé par sa bride de flasque, et engagé par un manchon de flasque dans un alésage de réception d'un corps de pompe où la cartouche est raccordée, respectivement, au centre de l'alésage, à un raccord central d'aspiration de la pompe et, au bord de l'alésage, à une sortie de refoulement de la pompe.The present invention relates to a vertical centrifugal pump assembly, in particular a multicellular centrifugal pump, consisting of at least one removable cartridge of a centrifugal hydraulic assembly forming a block clamped between two flange flanges and mounted on a vertical axis, fixed by its flange flange, and engaged by a flange sleeve in a bore receiving a pump body where the cartridge is connected, respectively, at the center of the bore, to a central suction connection of the pump and, to the edge of the bore, at a discharge outlet of the pump.

Des ensembles de pompes centrifuges verticaux pour lesquels on peut déposer, pour réparation ou rechange, uniquement la partie hydraulique active constituée par une cartouche d'éléments hydrauliques constitués de rotors et de stators, empilés et logés dans un bloc cylindrique amovible, sont largement utilisés. Ces ensembles permettent l'échange très rapide (en quelques minutes en général), après la dépose provisoire du moteur électrique d'entraînement de la pompe, de la seule partie hydraulique active de la pompe qui présente la plupart des incidents de marche et d'usure des pompes. Cet échange rapide nécessite cependant une intervention préalable: l'isolement de la pompe par rapport aux réseaux de fluides d'aspiration et de refoulement, ce qui n'est pas toujours possible. Un tel isolement nécessite l'existence et la manoeuvre de vannes d'isolement et se révèle particulièrement difficile à réaliser dans le cas des groupes de pompage multiples, doubles ou triples, où une pompe en réserve peut se substituer, en général automatiquement, à une pompe défaillante.Vertical centrifugal pump assemblies for which only the active hydraulic part made up of a cartridge of hydraulic elements made up of rotors and stators, stacked and housed in a removable cylindrical block, can be removed for repair or replacement. These assemblies allow the very rapid exchange (in a few minutes in general), after the provisional removal of the electric drive motor of the pump, of the only active hydraulic part of the pump which presents most incidents of running and wear of the pumps. However, this rapid exchange requires prior intervention: isolating the pump from the suction and discharge fluid networks, which is not always possible. Such isolation requires the existence and operation of isolation valves and is particularly difficult to achieve in the case of multiple, double or triple pumping groups, where a pump in reserve can replace, in general automatically, a pump faulty.

La présente invention a notamment pour but de permettre de réaliser l'isolement de la cartouche d'ensemble hydraulique à l'aide d'un simple clapet anti-retour qui ne modifie pas la conception et l'économie de l'ensemble de pompes. Ces dispositions se révèlent particulièrement avantageuses dans le cas des pompes multiples montées sur un carter unique de pompe.The present invention aims in particular to allow the isolation of the hydraulic assembly cartridge using a simple check valve which does not change the design and economy of the pump assembly. These arrangements prove to be particularly advantageous in the case of multiple pumps mounted on a single pump housing.

A cet effet, selon l'invention, un clapet anti-retour annulaire plat et s'ouvrant dans le sens du refoulement de la pompe est disposé au fond de l'alésage de réception entre la paroi intérieure dudit alésage et la paroi extérieure du raccord central d'aspiration.To this end, according to the invention, a flat annular non-return valve and opening in the direction of delivery of the pump is disposed at the bottom of the receiving bore between the inner wall of said bore and the outer wall of the connector. central vacuum.

L'utilisation d'un clapet anti-retour pour réaliser l'isolement automatique de la partie hydraulique de la pompe par rapport à la pression de refoulement était déjà connue mais elle est réalisée, selon l'invention, d'une façon particulièrement compacte, simple et économique et qui ne perturbe pas l'écoulement du liquide pompé, ni le fonctionnement des autres éléments de l'ensemble de pompe et n'augmente pas l'encombrement de l'ensemble de pompage.The use of a non-return valve to achieve automatic isolation of the hydraulic part of the pump from the discharge pressure was already known but it is produced, according to the invention, in a particularly compact manner, simple and economical and which does not disturb the flow of the pumped liquid, nor the operation of the other elements of the pump assembly and does not increase the size of the pumping assembly.

Selon un autre mode de réalisation avantageux de l'invention, le clapet anti-retour est maintenu en position axiale sur un premier épaulement ménagé au fond de l'alésage de réception et sur un deuxième épaulement ménagé sur la paroi extérieure du raccord central d'aspiration, par des moyens de retenue aptes à maintenir le clapet anti-retour en service à l'encontre de la pression de refoulement, après dépose de la cartouche amovible de l'ensemble hydraulique.According to another advantageous embodiment of the invention, the non-return valve is held in axial position on a first shoulder formed at the bottom of the receiving bore and on a second shoulder formed on the outer wall of the central connector of suction, by retaining means capable of keeping the non-return valve in service against the discharge pressure, after removal of the removable cartridge from the hydraulic assembly.

Le clapet anti-retour est avantageusement constitué, d'une part, d'une plaque annulaire plane rigide, par exemple en métal, percée d'au moins un trou de passage et dont la périphérie cylindrique extérieure est sensiblement ajustée dans l'alésage tandis que sa périphérie frontale est en appui sur un premier épaulement ménagé au fond de l'alésage de réception et, d'autre part, d'un anneau flexible plan appliqué sur ladite plaque annulaire, du côté opposé à la cartouche amovible, à l'intérieur du corps de pompe, pour obturer le ou les trou(s) de passage, ledit anneau flexible étant en appui, à sa partie périphérique intérieure, sur un deuxième épaulement annulaire plan ménagé sur la paroi extérieure du raccord central d'aspiration. L'anneau flexible plan est, en général, constitué d'une rondelle en élastomère maintenue appliquée sur la plaque rigide par un anneau central rigide de maintien, interposé entre l'anneau flexible et le deuxième épaulement, ledit anneau central présentant un diamètre extérieur nettement inférieur à celui sur lequel sont disposés le ou les trous de passage.The non-return valve advantageously consists, on the one hand, of a rigid flat annular plate, for example of metal, pierced with at least one through hole and the external cylindrical periphery of which is substantially adjusted in the bore while that its front periphery is supported on a first shoulder formed at the bottom of the receiving bore and, on the other hand, of a flat flexible ring applied to said annular plate, on the side opposite to the removable cartridge, to the inside the pump body, for closing the passage hole (s), said flexible ring being in abutment, at its inner peripheral part, on a second flat annular shoulder formed on the outer wall of the central suction fitting. The planar flexible ring generally consists of an elastomer washer maintained applied to the rigid plate by a rigid central retaining ring, interposed between the flexible ring and the second shoulder, said central ring having an outer diameter markedly lower than that on which the passage hole or holes are arranged.

Selon un autre mode de réalisation, l'anneau flexible plan est constitué par une plaque circulaire mince munie d'un trou central et de fentes radiales ouvertes vers l'extérieur et qui s'étendent jusqu'à une couronne continue ménagée autour du trou central, de manière à constituer une série de clapets à lamelle disposés radialement, chacun en face d'au moins l'un des trous de passage.According to another embodiment, the planar flexible ring is constituted by a thin circular plate provided with a central hole and radial slots open towards the outside and which extend up to a continuous crown formed around the central hole , so as to constitute a series of lamella valves arranged radially, each facing at least one of the through holes.

Selon un premier mode de réalisation de l'invention, la plaque annulaire plane est maintenue en butée sur le premier et sur le deuxième épaulements, respectivement par un premier anneau élastique ou "circlips" logé dans une rainure ménagée dans la paroi de l'alésage de réception et par un deuxième anneau élastique ou "circlips" logé dans une rainure ménagée sur la paroi cylindrique extérieure du raccord central d'aspiration.According to a first embodiment of the invention, the flat annular plate is held in abutment on the first and on the second shoulders, respectively by a first elastic ring or "circlips" housed in a groove made in the wall of the bore receiving and by a second elastic ring or "circlips" housed in a groove formed on the outer cylindrical wall of the central suction connection.

Selon un autre mode de réalisation permettant au clapet anti-retour de résister à des pressions de refoulement plus importantes, la plaque annulaire plane est maintenue en butée sur le premier et sur le deuxième épaulements par l'appui frontal, d'une part, à sa périphérie extérieure hors de la zone du ou des trous de passage, d'une première portée annulaire ménagée sur un manchon d'extrémité du flasque inférieur de ladite cartouche amovible, engagé dans l'alésage de réception et, d'autre part, à sa périphérie extérieure, d'une deuxième portée annulaire ménagée sur le raccord central d'aspiration du flasque inférieur de la cartouche amovible.According to another embodiment allowing the non-return valve to resist higher discharge pressures, the flat annular plate is held in abutment on the first and on the second shoulders by the front support, on the one hand, at its outer periphery outside the area of the hole or holes, a first annular bearing formed on an end sleeve of the lower flange of said removable cartridge, engaged in the receiving bore and, on the other hand, to its outer periphery, a second annular bearing formed on the central suction connection of the lower flange of the removable cartridge.

Selon encore un autre mode de réalisation de l'invention permettant au clapet anti-retour de résister à des pressions de refoulement importantes après dépose de la cartouche amovible et, également, de déposer aisément le clapet anti-retour après une longue durée de service, la plaque annulaire plane est maintenue en butée sur le premier et sur le deuxième épaulements par l'appui frontal, d'une part, à sa périphérie extérieure, hors de la zone du ou des trous de passage d'une première portée annulaire d'un manchon d'extrémité d'un flasque de maintien, identique ou similaire au flasque inférieur de ladite cartouche amovible, engagé dans l'alésage de réception et, d'autre part, à sa périphérie intérieure, d'une deuxième portée annulaire ménagée sur le raccord central d'aspiration dudit flasque de maintien qui comporte un alésage de réception du manchon du flasque inférieur de la cartouche amovible.According to yet another embodiment of the invention allowing the non-return valve to withstand high delivery pressures after removal of the removable cartridge and, also, to easily deposit the non-return valve after a long service life, the flat annular plate is held in abutment on the first and on the second shoulders by the front support, on the one hand, at its outer periphery, outside the area of the through holes of a first annular bearing surface of an end sleeve of a retaining flange, identical or similar to the lower flange of said removable cartridge, engaged in the receiving bore and, on the other hand, at its inner periphery, of a second annular bearing formed on the central suction connection of said retaining flange which comprises a bore for receiving the sleeve of the lower flange of the removable cartridge.

La présente invention concerne également les unités de pompage à au moins deux pompes centrifuges verticales, à cartouche hydraulique amovible, montées sur un carter commun d'aspiration et de refoulement, lesdites pompes étant susceptibles de fonctionner simultanément et/ou séparément. Dans ces unités, chaque pompe verticale est constituée par un ensemble de pompe centrifuge muni d'un clapet anti-retour selon les dispositions qui viennent d'être décrites. Selon l'invention, le carter commun peut comporter un robinet distributeur intégré de l'aspiration des pompes, à quatre positions correspondant respectivement: à l'isolement de l'aspiration des deux pompes, à la liaison des deux pompes à l'aspiration et à la liaison à l'aspiration de l'une des deux pompes tandis que l'autre pompe est isolée, de telle manière qu'après isolement de l'aspiration de l'une des pompes alors que l'autre reste en service, la cartouche d'ensemble hydraulique de la pompe isolée puisse être déposée en étant isolée de la pression de refoulement par le clapet anti-retour.The present invention also relates to pumping units with at least two vertical centrifugal pumps, with removable hydraulic cartridge, mounted on a common suction and discharge casing, said pumps being capable of operating simultaneously and / or separately. In these units, each vertical pump is constituted by a centrifugal pump assembly provided with a non-return valve according to the arrangements which have just been described. According to the invention, the common casing may include an integrated distributor valve for the suction of the pumps, with four positions corresponding respectively: to the isolation of the suction of the two pumps, to the connection of the two pumps to the suction and at the connection to the suction of one of the two pumps while the other pump is isolated, so that after isolation of the suction of one of the pumps while the other remains in service, the insulated pump assembly cartridge can be removed by being isolated from the discharge pressure by the non-return valve.

Lorsqu'on monte plus de deux ensembles de pompes selon l'invention sur un même carter, le carter commun peut comporter, pour chaque pompe centrifuge verticale, un robinet à deux positions: ouverture et respectivement fermeture de l'aspiration de la pompe, susceptible d'être commandé indépendamment pour chaque pompe qui est munie du clapet anti-retour intégré apte à l'isoler du refoulement commun.When more than two sets of pumps according to the invention are mounted on the same casing, the common casing may comprise, for each vertical centrifugal pump, a valve with two positions: opening and respectively closing of the suction of the pump, capable of to be controlled independently for each pump which is fitted with an integrated non-return valve capable of isolating it from the common delivery.

D'autres buts, avantages et caractéristiques apparaîtront à la lecture de la description de divers modes de réalisation de l'invention, faite à titre non limitatif et en regard du dessin annexé où:

  • la figure 1 représente, en coupe transversale par l'axe, un premier mode de réalisation d'un ensemble de pompe centrifuge selon l'invention;
  • la figure 2 représente, dans le même plan de coupe que la figure 1, un deuxième mode de réalisation de l'invention;
  • la figure 3 représente, en coupe selon les plans de coupe III-III de la figure 4, un carter pour un bloc à deux pompes selon l'invention;
  • la figure 4 est une vue en plan du carter de la figure 3, les clapets anti-retour étant déposés et l'admission à travers le robinet distributeur d'aspiration ainsi que le refoulement étant représentés en coupe après arrachement de la partie supérieure du carter;
  • la figure 5 est une vue en plan d'une rondelle métallique constituant le clapet proprement dit d'une variante du clapet anti-retour de l'ensemble de pompe selon l'invention;
  • la figure 6 représente en coupe transversale un carter de bloc à plusieurs pompes verticales, selon l'invention.
Other objects, advantages and characteristics will appear on reading the description of various embodiments of the invention, given without limitation and with reference to the appended drawing where:
  • Figure 1 shows, in cross section along the axis, a first embodiment of a centrifugal pump assembly according to the invention;
  • FIG. 2 represents, in the same section plane as FIG. 1, a second embodiment of the invention;
  • 3 shows, in section along the section planes III-III of Figure 4, a housing for a block with two pumps according to the invention;
  • Figure 4 is a plan view of the housing of Figure 3, the non-return valves being removed and the intake through the suction distributor valve as well as the discharge being shown in section after cutaway of the upper part of the housing ;
  • Figure 5 is a plan view of a metal washer constituting the valve itself of a variant of the non-return valve of the pump assembly according to the invention;
  • FIG. 6 shows in cross section a block casing with several vertical pumps, according to the invention.

On a représenté sur les figures 1 et 2 une pompe multicellulaire verticale à cartouche amovible 1 du type centrifuge, entraînée en rotation par un moteur non représenté, fixé au-dessus d'un flasque de support et relié au rotor de pompe par un accouplement 2 (représenté partiellement à la figure 2) et un arbre de pompe 3. Les étages de la pompe (il s'agit ici d'une pompe à cinq étages) sont constitués chacun d'un rotor ou roue de pompe claveté ou autrement monté sur l'arbre 3 et d'un stator formant diffuseur de récupération de l'énergie cinétique transmise au liquide pour la transformer en pression et amener le liquide pompé à l'étage aval suivant.FIGS. 1 and 2 show a vertical multicellular pump with removable cartridge 1 of the centrifugal type, driven in rotation by a motor not shown, fixed above a support flange and connected to the pump rotor by a coupling 2 (partially shown in Figure 2) and a pump shaft 3. The stages of the pump (here it is a five-stage pump) each consist of a rotor or pump wheel keyed or otherwise mounted on the shaft 3 and a stator forming a diffuser for recovering the kinetic energy transmitted to the liquid to transform it into pressure and bring the pumped liquid to the next downstream stage.

L'ensemble 4 des étages de pompe empilés est inséré avec ses paliers dans un tube 5 résistant à la pression et aussi à la corrosion (réalisé par exemple en acier inoxydable) et qui est fermé à chaque extrémité, respectivement par un flasque supérieur 6 et par un flasque inférieur 7. Le flasque supérieur 6 est obturé par un couvercle 8 qui sert de support au moteur électrique d'entraînement (non représenté) et comporte une bride 9 munie d'une couronne de trous pour des boulons ou tirants de serrage 10 des deux flasques 6 et 7. Le flasque inférieur 7 présente une bride extérieure 11 percée d'une série de trous permettant le passage alterné des boulons 10 et de vis 12 de fixation du flasque inférieur 7 sur un corps de pompe 13 venu, en général, de fonderie et muni d'une couronne de trous filetés 14 de fixation autour d'un alésage 15 de réception d'un manchon 16 du flasque inférieur 7. On notera que les flasques 6 et 7 comportent chacun un alésage de réception étanche du tube 5 grâce à des joints toriques 5a et 5b, logés chacun dans une rainure ménagée sur la paroi de l'alésage. Le flasque inférieur 7 est arrêté axialement par un épaulement 17 qui vient en appui sur la face supérieure plane 17a ménagée à la sortie de l'alésage 15, perpendiculairement aux trous filetés 14.The assembly 4 of the stacked pump stages is inserted with its bearings in a tube 5 resistant to pressure and also to corrosion (made for example of stainless steel) and which is closed at each end, respectively by an upper flange 6 and by a lower flange 7. The upper flange 6 is closed by a cover 8 which serves as a support for the electric drive motor (not shown) and comprises a flange 9 provided with a ring of holes for bolts or tightening rods 10 of the two flanges 6 and 7. The lower flange 7 has an outer flange 11 pierced with a series of holes allowing the alternating passage of the bolts 10 and screws 12 for fixing the lower flange 7 on a pump body 13 come, in general , foundry and provided with a ring of threaded holes 14 for fixing around a bore 15 for receiving a sleeve 16 of the lower flange 7. It will be noted that the flanges 6 and 7 each have a recess bore tight eption of the tube 5 thanks to O-rings 5a and 5b, each housed in a groove formed on the wall of the bore. The lower flange 7 is stopped axially by a shoulder 17 which comes to bear on the flat upper face 17a formed at the outlet of the bore 15, perpendicular to the threaded holes 14.

Le flasque inférieur 7 comporte une partie centrale 18 munie de passages périphériques 19 qui sont ménagés entre des rayons de liaison vers la bride 11 et sont reliés à un passage annulaire 20 ménagé à l'intérieur du tube 5 entre la sortie du dernier étage de la pompe et l'empilement 4 des étages. La partie centrale 18 forme en son centre un raccord central d'aspiration 21 débouchant sur l'ouverture filetée ou taraudée d'aspiration 22 du corps de pompe 13.The lower flange 7 has a central part 18 provided with peripheral passages 19 which are formed between connecting spokes to the flange 11 and are connected to an annular passage 20 formed inside the tube 5 between the outlet of the last stage of the pump and stacking 4 floors. The central part 18 forms at its center a central suction connection 21 leading to the threaded or tapped suction opening 22 of the pump body 13.

Dans le mode de réalisation de la figure 1, l'alésage 15 débouche sur une ouverture 23 ménagée à l'intérieur du corps de pompe 13 et reliée à la sortie filetée ou taraudée de refoulement 24 et l'alésage 15 s'arrête sur un premier épaulement annulaire 25 plan et perpendiculaire à l'alésage. Un clapet anti-retour annulaire plat 26 est disposé au fond de l'alésage 15, en appui sur l'épaulement 25. Le clapet anti-retour 26 qui s'ouvre dans le sens du refoulement de la pompe coupe ainsi l'écoulement des passages périphériques 19 vers la sortie de refoulement 24. Le clapet 26 est constitué ici d'une plaque annulaire plane 27 assez rigide, par exemple en acier d'une épaisseur de l'ordre de 5 mm, et rectifiée bien plane sur les deux faces pour bien s'ajuster et porter sur la surface plane de l'épaulement 25. La surface cylindrique extérieure de la plaque 27 peut s'ajuster à frottement doux dans l'alésage 15 ou bien peut présenter un léger jeu par rapport à cet alésage.In the embodiment of FIG. 1, the bore 15 opens onto an opening 23 formed inside the pump body 13 and connected to the threaded or tapped outlet outlet 24 and the bore 15 stops on a first annular shoulder 25 plane and perpendicular to the bore. A flat annular non-return valve 26 is disposed at the bottom of the bore 15, bearing on the shoulder 25. The non-return valve 26 which opens in the direction of discharge of the pump thus cuts the flow of peripheral passages 19 towards the discharge outlet 24. The valve 26 here consists of a fairly rigid flat annular plate 27, for example of steel with a thickness of the order of 5 mm, and ground evenly flat on both sides to properly adjust and bear on the flat surface of the shoulder 25. The outer cylindrical surface of the plate 27 can be adjusted with gentle friction in the bore 15 or may have a slight play with respect to this bore.

La plaque 27 présente au moins un trou de passage 28, plus généralement une série de trous de passage 28 répartis régulièrement, leur axe étant placé par exemple sensiblement aux deux tiers extérieurs de la largeur de la plaque. Les trous de passage 28 situés à proximité d'une cloison transversale 70 les isolant de l'admission, peuvent être supprimés. La face de la plaque 27 qui regarde vers la sortie de refoulement 24 est recouverte d'un anneau flexible plan 29 qui obture les trous de passage 28. L'anneau flexible 29 est avantageusement constitué par une rondelle en élastomère épaisse de plusieurs millimètres pour résister à l'effet de la pression de refoulement qui la plaque sur les trous 28. La rondelle 29 est appliquée sur la face 30 de la plaque 27, d'une part, du fait de son appui périphérique du côté de l'ouverture d'aspiration 22 sur un épaulement 31 et, d'autre part, en son centre, par l'intermédiaire d'une rondelle en tôle 32 en appui sur un deuxième épaulement 33 ménagé autour de la paroi extérieure d'un raccord d'aspiration 34 du corps de pompe 13.The plate 27 has at least one passage hole 28, more generally a series of passage holes 28 distributed regularly, their axis being placed for example roughly two-thirds outside the width of the plate. The through holes 28 located near a transverse partition 70 isolating them from the intake can be omitted. The face of the plate 27 which looks towards the discharge outlet 24 is covered with a planar flexible ring 29 which closes the through holes 28. The flexible ring 29 is advantageously constituted by an elastomer washer several millimeters thick to resist to the effect of the discharge pressure which the plate on the holes 28. The washer 29 is applied to the face 30 of the plate 27, on the one hand, due to its peripheral support on the side of the opening suction 22 on a shoulder 31 and, on the other hand, in its center, by means of a sheet metal washer 32 bearing on a second shoulder 33 formed around the outer wall of a suction fitting 34 of the pump body 13.

L'anneau flexible 29 peut également être constitué par une plaque circulaire mince en un matériau résistant, par exemple en tôle d'un métal résistant tel que laiton ou acier inoxydable. Dans le mode de réalisation représenté à la figure 5, la plaque mince 29' en acier inoxydable est munie de fentes radiales 29a de largeur constante ou évasées vers l'extérieur comme représenté sur la figure. Ces fentes 29a ouvertes vers l'extérieur s'étendent jusqu'à une couronne continue 29b qui entoure un passage central 87 présentant un diamètre légèrement supérieur au diamètre extérieur usiné du raccord 34 au-dessus de l'épaulement 33. On forme ainsi une série de lamelles radiales 29c montées élastiquement en porte-à-faux sur la couronne 29b et qui peuvent chacune venir obturer un trou de passage 28 (un seul de ces trous 28 est représenté en pointillés sur l'une des lamelles 29c) pour réaliser chacune, en coopération avec la surface plane de la plaque rigide 27, un clapet à lamelle apte à résister à des contre-pressions élevées sans présenter d'usure dans le temps.The flexible ring 29 can also be constituted by a thin circular plate made of a resistant material, for example made of sheet metal of a resistant metal such as brass or stainless steel. In the embodiment shown in FIG. 5, the thin plate 29 ′ of stainless steel is provided with radial slots 29a of constant width or flared towards the exterior as shown in the figure. These outwardly open slots 29a extend to a continuous ring 29b which surrounds a central passage 87 having a diameter slightly greater than the machined outer diameter of the connector 34 above the shoulder 33. A series is thus formed radial strips 29c elastically mounted in cantilever on the crown 29b and which can each close a passage hole 28 (only one of these holes 28 is shown in dotted lines on one of the strips 29c) to produce each, in cooperation with the flat surface of the rigid plate 27, a flap valve capable of withstanding high back pressures without exhibiting wear over time.

Dans le mode de réalisation représenté à la figure 1, la plaque rigide 27 du clapet anti-retour 26 est maintenue, d'une part, en appui direct sur l'épaulement 25 par un anneau élastique ou "circlips" 35 logé dans une rainure de l'alésage 15 et, d'autre part, en appui indirect par l'intermédiaire de la rondelle flexible en élastomère 29 sur l'épaulement 33 du raccord central 34 par un anneau élastique ou "circlips" 36 logé dans une rainure de la surface cylindrique usinée 37 du raccord d'aspiration 34. La surface cylindrique 37 peut également servir à guider l'alésage central correspondant de la plaque 27 et de la rondelle élastique 29. Afin d'assurer une liaison sensiblement étanche entre le raccord central d'aspiration 21 de la partie centrale 18 du flasque inférieur 7 et, respectivement, le raccord central 34 du corps de pompe 13, ces raccords portent respectivement des manchons conjugués 21a et 34a entre lesquels vient se loger un joint d'étanchéité torique 38.In the embodiment represented in FIG. 1, the rigid plate 27 of the non-return valve 26 is maintained, on the one hand, in direct support on the shoulder 25 by an elastic ring or "circlips" 35 housed in a groove of the bore 15 and, on the other hand, in indirect support via the flexible elastomer washer 29 on the shoulder 33 of the central connector 34 by an elastic ring or "circlips" 36 housed in a groove of the machined cylindrical surface 37 of the suction fitting 34. The cylindrical surface 37 can also be used to guide the corresponding central bore of the plate 27 and of the elastic washer 29. In order to ensure a substantially tight connection between the central fitting of suction 21 of the central part 18 of the lower flange 7 and, respectively, the central connector 34 of the pump body 13, these connectors respectively carry conjugated sleeves 21a and 34a between which is housed an O-ring seal 38.

L'étanchéité entre la plaque rigide 27 et l'épaulement 33 peut être obtenue par contact direct ou bien en interposant un joint annulaire plat entre la périphérie de la plaque 27 et la surface annulaire de l'épaulement 33, ce qui assure une étanchéité persistante même lorsqu'il règne des pressions élevées et/ou des températures au refoulement de la pompe. Selon un mode de réalisation avantageux sur le plan du montage du clapet anti-retour et de la résistance mécanique à la pression de ce dernier, les manchons 16 et 21a sont prolongés jusqu'à venir en appui sur la surface supérieure 27b de la plaque rigide 27 sous l'action de serrage des vis 12. Dans ce mode de réalisation, l'épaulement 17 est reculé pour ne pas venir en appui sur la face supérieure plane 17a et les prolongements des manchons 16 et 21a sont munis d'un décrochement qui entoure les anneaux élastiques respectifs 35 et 36 en évitant qu'ils viennent en contact avec les prolongements. Les extrémités de ces prolongements sont planes pour bien porter sur la surface supérieure 27b. Lorsque le flasque inférieur 7 est déposé, la plaque rigide 27 du clapet anti-retour n'est plus maintenue que par les anneaux élastiques 35 et 36 qui ne résistent qu'à une faible pression de refoulement mais cette situation n'est pas gênante car les pressions de refoulement sont alors nulles ou faibles. Lorsque le flasque 7 est en place, les prolongements des manchons 16 et 21a constituent des surfaces de retenue annulaires importantes aptes à résister, avec la plaque 27, aux pressions de refoulement importantes (pouvant atteindre plusieurs dizaines de bars dans des ambiances dépassant parfois 200°C) qui règnent à la sortie de refoulement 24.The seal between the rigid plate 27 and the shoulder 33 can be obtained by direct contact or by interposing a flat annular seal between the periphery of the plate 27 and the annular surface of the shoulder 33, which ensures a persistent seal. even when high pressures and / or temperatures prevail at the pump discharge. According to an advantageous embodiment in terms of mounting the non-return valve and the mechanical resistance to the pressure of the latter, the sleeves 16 and 21a are extended until they come to bear on the upper surface 27b of the rigid plate 27 under the tightening action of the screws 12. In this embodiment, the shoulder 17 is moved back so as not to come to bear on the flat upper face 17a and the extensions of the sleeves 16 and 21a are provided with a recess which surrounds the respective elastic rings 35 and 36, preventing them from coming into contact with the extensions. The ends of these extensions are planar so as to bear well on the upper surface 27b. When the lower flange 7 is removed, the rigid plate 27 of the non-return valve is no longer held except by the elastic rings 35 and 36 which only resist a low discharge pressure but this situation is not a problem since the discharge pressures are then zero or low. When the flange 7 is in place, the extensions of the sleeves 16 and 21a constitute large annular retaining surfaces capable of withstanding, with the plate 27, the high discharge pressures (which can reach several tens of bars in atmospheres sometimes exceeding 200 ° C) which prevail at the discharge outlet 24.

Le fonctionnement de l'ensemble de pompe représenté à la figure 1 va maintenant être explicité. Lorsque la pompe est montée dans la position représentée à la figure 1, le manchon 16 du flasque inférieur 7 est engagé, de façon étanche, dans l'alésage 15 au contact d'un joint torique 39 et le serrage de la couronne de vis 12 maintient rigidement en position le flasque inférieur 7 sur le corps de pompe 13 tandis que les boulons 10 formant tirants maintiennent la cohésion de la cartouche amovible 1. La pression du liquide refoulé par la pompe vers le passage annulaire 20 repousse la rondelle élastique 29 dans la direction du refoulement pour lui faire prendre la position d'ouverture 29a représentée en traits mixtes.The operation of the pump assembly shown in Figure 1 will now be explained. When the pump is mounted in the position shown in FIG. 1, the sleeve 16 of the lower flange 7 is engaged, in leaktight manner, in the bore 15 in contact with an O-ring 39 and the tightening of the screw crown 12 rigidly maintains in position the lower flange 7 on the pump body 13 while the bolts 10 forming tie rods maintain the cohesion of the removable cartridge 1. The pressure of the liquid discharged by the pump towards the annular passage 20 pushes the elastic washer 29 back into the direction of the discharge to make it take the open position 29a shown in phantom.

Si la pompe s'arrête pour une cause quelconque, y compris un incident, la pression de refoulement qui persiste, par exemple du fait de la liaison à un réservoir sous pression, fait aussitôt plaquer la rondelle élastique 29 formant clapet sur la plaque rigide 27 pour obturer les trous 28. Si l'on doit procéder à l'échange de la cartouche amovible 1, il suffit de dévisser les vis 12 après avoir déposé le moteur d'entraînement de la pompe, pour retirer le manchon 16 de l'alésage 15. L'aspiration 22 lorsqu'elle n'est pas sous pression ne produit que des fuites infimes qui s'arrêtent immédiatement. Le clapet anti-retour 26 reste en position, maintenu par les anneaux élastiques ou "circlips" 35 et 36, à l'encontre de la pression régnant au refoulement. Afin de s'assurer contre toute fuite dans cette position, on pourra prévoir un joint torique d'étanchéité 27a entre la périphérie chanfreinée de la plaque annulaire 27 et les surfaces qui se croisent de l'épaulement 25 et de l'alésage 15. Le serrage de l'élastomère de la rondelle 29 entre la plaque 27 et la rondelle 32 garantit, par contre, une certaine étanchéité au voisinage de l'épaulement 33 du raccord 34. L'étanchéité du clapet anti-retour 26 ne persiste pas pendant des jours mais au moins pendant plusieurs heures, ce qui constitue une durée suffisante pour procéder à la dépose et à l'échange de la cartouche 1 qui est remise en place par engagement du manchon 16 dans l'alésage 15 suivi d'un serrage des vis 12 pour bien assujettir la cartouche hydraulique complète 1 sur le corps de pompe 13. Lorsque l'aspiration de la pompe est en charge (jusqu'à des pressions pouvant atteindre 15 bars pour certaines installations de surpresseurs d'eau), il faut prévoir une vanne de coupure de l'aspiration et procéder à l'échange de la cartouche 1 à l'arrêt des pompes.If the pump stops for any reason, including an incident, the discharge pressure which persists, for example due to the connection to a pressure tank, immediately causes the elastic washer 29 to form, forming valve on the rigid plate 27 to close the holes 28. If the removable cartridge 1 has to be replaced, it is sufficient to unscrew the screws 12 after removing the pump drive motor, to remove the sleeve 16 of bore 15. Suction 22 when it is not under pressure produces only minute leaks which stop immediately. The non-return valve 26 remains in position, held by the elastic rings or "circlips" 35 and 36, against the pressure prevailing at the discharge. In order to ensure against leakage in this position, an O-ring seal 27a may be provided between the chamfered periphery of the annular plate 27 and the intersecting surfaces of the shoulder 25 and the bore 15. The tightening the elastomer of the washer 29 between the plate 27 and the washer 32 guarantees, on the other hand, a certain tightness in the vicinity of the shoulder 33 of the connector 34. The tightness of the non-return valve 26 does not persist for days but at least for several hours, which constitutes sufficient time to proceed with the removal and exchange of the cartridge 1 which is replaced by engagement of the sleeve 16 in the bore 15 followed by tightening of the screws 12 to properly secure the complete hydraulic cartridge 1 to the pump body 13. When the pump suction is loaded (up to pressures up to 15 bar for certain installations of water boosters), provision must be made a suction shut-off valve and replace the cartridge 1 when the pumps stop.

L'utilisation d'anneaux élastiques ou "circlips" concentriques selon la solution représentée à la figure 1 présente, à côté d'une disposition très compacte, deux inconvénients pour des pompes. D'une part, pour les pompes de puissance importante, les efforts de pression très importants qui se développent ne peuvent plus être supportés par les anneaux élastiques ou circlips alors que le serrage axial des circlips est souvent insuffisant et ne peut pas être réglé ou corrigé. D'autre part, après une longue durée de service dans des ambiances corrosives, il se révèle souvent impossible de démonter les anneaux élastiques de leurs rainures annulaires et donc impossible de déposer le clapet anti-retour en cas de besoin.The use of concentric elastic rings or "circlips" according to the solution shown in FIG. 1 has, apart from a very compact arrangement, two drawbacks for pumps. On the one hand, for large power pumps, the very large pressure forces which develop can no longer be supported by the elastic rings or circlips whereas the axial tightening of the circlips is often insufficient and cannot be adjusted or corrected . On the other hand, after a long service life in corrosive environments, it often turns out to be impossible to dismantle the elastic rings from their annular grooves and therefore impossible to remove the non-return valve if necessary.

Afin d'éviter ces inconvénients, la présente invention propose la solution représentée à la figure 2 qui est moins compacte mais plus résistante et plus facile à régler tout en restant plus flexible et plus adaptable aux corps de pompe existants. Les éléments représentés à la figure 2 et qui sont identiques ou similaires à ceux de la figure 1 ont été dotés des mêmes indices de référence.In order to avoid these drawbacks, the present invention proposes the solution shown in FIG. 2 which is less compact but more resistant and easier to adjust while remaining more flexible and more adaptable to existing pump bodies. The elements represented in FIG. 2 and which are identical or similar to those of FIG. 1 have been given the same reference indices.

Afin de maintenir en position le clapet anti-retour 26 de l'ensemble de pompe centrifuge représenté à la figure 2, on prévoit un flasque 40 similaire ou identique au flasque inférieur 7 de la cartouche 1 et qui est fixé sur le corps de pompe 13 à l'aide d'une couronne de vis 12 traversant des perçages 42 d'une bride 41. Les perçages 42 sont alternés sur la bride 41 avec des perçages 43 pour le passage de vis de fixation plus longues 44 venant serrer la bride 11 du flasque 7 de la cartouche amovible 1. Le flasque 40 qui sert de flasque de maintien du clapet anti-retour 26 présente un manchon d'extrémité 45 qui vient s'engager, de façon étanche, dans l'alésage 15 grâce au joint d'étanchéité torique 39. Le manchon 45 vient également en appui, par une couronne frontale périphérique 47, sur une zone annulaire périphérique plane de la plaque de clapet 27, un joint torique d'étanchéité 46 étant interposé entre un chanfrein 48 de cette face frontale 47 et, simultanément, l'alésage 15 et la face frontale supérieure périphérique de la plaque 27.In order to keep the non-return valve 26 of the centrifugal pump assembly shown in FIG. 2 in position, a flange 40 is provided similar or identical to the lower flange 7 of the cartridge 1 and which is fixed to the pump body 13 using a screw crown 12 passing through holes 42 of a flange 41. The holes 42 are alternated on the flange 41 with holes 43 for the passage of longer fixing screws 44 coming to tighten the flange 11 of the flange 7 of the removable cartridge 1. The flange 40 which serves as a flange for holding the non-return valve 26 has an end sleeve 45 which engages, sealingly, in the bore 15 thanks to the seal O-ring seal 39. The sleeve 45 also comes to bear, by a peripheral front ring 47, on a flat peripheral annular zone of the valve plate 27, an O-ring seal 46 being interposed between a chamfer 48 of this front face 47 and, simultaneously anement, the bore 15 and the upper peripheral end face of the plate 27.

La partie centrale 18a du flasque 40, similaire ou identique à la partie 18 du flasque inférieur 7, vient en appui par une deuxième portée 49 ménagée sur un raccord central d'aspiration 21a, sur la périphérie intérieure de la plaque 27 pour la presser, de façon étanche, sur la rondelle en élastomère 29 en appui sur l'épaulement 33 du raccord central 34 du corps de pompe 13. Pour compléter le passage d'aspiration de la pompe, la partie centrale 18 du flasque inférieur 7 de la cartouche amovible 1 vient en appui étanche sur le raccord d'aspiration 34a du flasque 40, de la même façon que pour l'appui étanche entre les raccords 21 et 34 de la figure 1 ou bien, comme représenté à la figure 2, par l'intermédiaire d'un manchon en élastomère 50 apte à compenser de plus grands écarts axiaux. Le flasque 40 présente un alésage 51 à joint torique 52 pour la réception du manchon 16 du flasque inférieur 7 de la cartouche amovible 1. On voit que si l'alésage 5c de réception du tube 5 est apte à recevoir, de façon ajustée, non seulement la surface extérieure du tube 5, mais aussi la surface extérieure du manchon 16, il est possible d'utiliser des flasques 7 et 40 identiques pour le mode de réalisation de la figure 2, ce qui constitue un gros avantage sur le plan de la fabrication en série des pièces de l'ensemble de pompe.The central part 18a of the flange 40, similar or identical to the part 18 of the lower flange 7, comes to bear by a second bearing 49 formed on a central suction connection 21a, on the inner periphery of the plate 27 to press it, sealingly, on the elastomer washer 29 bearing on the shoulder 33 of the central connector 34 of the pump body 13. To complete the suction passage of the pump, the central part 18 of the lower flange 7 of the removable cartridge 1 comes in sealed support on the suction connection 34a of the flange 40, in the same way as for the sealed support between the connections 21 and 34 of Figure 1 or, as shown in Figure 2, via an elastomeric sleeve 50 capable of compensating for greater axial deviations. The flange 40 has a bore 51 with an O-ring 52 for receiving the sleeve 16 of the lower flange 7 of the removable cartridge 1. It can be seen that if the bore 5c for receiving the tube 5 is capable of receiving, in an adjusted manner, not only the outer surface of the tube 5, but also the outer surface of the sleeve 16, it is possible to use identical flanges 7 and 40 for the embodiment of Figure 2, which is a big advantage in terms of mass production of pump assembly parts.

Le fonctionnement de l'ensemble de pompe représenté à la figure 2 se déduit de celui expliqué en correspondance à la figure 1. La pompe étant montée, comme représenté sur la figure et en service, il est possible de déposer la cartouche amovible 1 de rotors et de stators en dévissant les vis 44. Les vis 12 intercalées entre les vis 44 maintiennent le flasque 40 en position et ce flasque qui résiste à des efforts de pression importants grâce à son épaisseur et à ses nervures, s'oppose à tout déplacement de la plaque 27 du clapet anti-retour 26 sous l'effet de la pression de refoulement. S'il est nécessaire de déposer le clapet anti-retour, par exemple parce qu'il n'est plus étanche, on peut toujours déposer le flasque de maintien 40 après dévissage des vis 12 et accéder au clapet 26 qui ne risque plus d'être bloqué par la corrosion, comme dans la solution de la figure 1.The operation of the pump assembly shown in Figure 2 is deduced from that explained in correspondence to Figure 1. The pump being mounted, as shown in the figure and in service, it is possible to remove the removable cartridge 1 of rotors and stators by unscrewing the screws 44. The screws 12 interposed between the screws 44 hold the flange 40 in position and this flange which withstands significant pressure forces thanks to its thickness and its ribs, prevents any movement of the plate 27 of the non-return valve 26 under the effect of the discharge pressure. If it is necessary to remove the non-return valve, for example because it is no longer waterproof, one can always remove the retaining flange 40 after unscrewing the screws 12 and access the valve 26 which no longer risks be blocked by corrosion, as in the solution of figure 1.

On peut bien entendu prévoir que le clapet anti-retour 26 de la pompe est maintenu en position directement par l'appui du flasque inférieur 7 sur la plaque rigide 27. Dans un tel mode de réalisation, l'encombrement en hauteur de la pompe est moindre, mais pour pouvoir déposer la cartouche amovible 1, il est nécessaire d'isoler préalablement le clapet anti-retour 26 du refoulement car ce clapet n'est plus maintenu en position après dépose de la cartouche 1. Cet isolement peut être réalisé à l'aide de moyens bien connus tels qu'un clapet anti-retour placé à l'aval de la sortie de refoulement 24 ou bien qu'une vanne de coupure.It can of course be provided that the non-return valve 26 of the pump is held in position directly by the support of the lower flange 7 on the rigid plate 27. In such an embodiment, the overall height of the pump is less, but in order to be able to remove the removable cartridge 1, it is necessary to isolate the non-return valve 26 from the delivery beforehand because this valve is no longer held in position after removal of the cartridge 1. This isolation can be carried out at using well-known means such as a non-return valve placed downstream of the discharge outlet 24 or else a cut-off valve.

Le bloc à deux pompes représenté sur les figures 3 et 4 comporte un carter de fonderie 60 à socle 61 et à deux entrées 62 et 63 et deux sorties 64 et 65 de liquide, les entrées inutilisées étant obturées par des bouchons filetés 63a et 65a. Deux socles plan 66 et 67 de fixation de cartouche de pompe, font saillie vers le haut en entourant des raccords centraux d'admission de fluide respectifs 68 et 69. Les socles 66 et 67 présentent sur leur face plane supérieure 17a des trous filetés 14 de réception de vis telles que les vis 12 ou 44 représentées sur les figures 1 et 2 et à la figure 3. Un alésage de réception 15 similaire à celui représenté sur les figures 1 et 2 est prévu à l'intérieur des socles, cet alésage 15 débouchant à sa périphérie sur un épaulement plan 25 pour la réception de la plaque de clapet 27 et, du côté opposé à une cloison de séparation 70 (représentée également sur les figures 1 et 2), sur un passage 71 vers le refoulement. Sur la figure 3, on a représenté chacun des alésages 15, équipé à son extrémité de fond d'un clapet anti-retour 26 maintenu en position par un flasque 40 fixé par des vis 12 sur le socle plan 66 ou 67. Chacun des flasques 40, du même type que celui représenté à la figure 2, est prêt à recevoir une cartouche amovible 1 de stators et de rotors.The block with two pumps shown in FIGS. 3 and 4 comprises a foundry casing 60 with base 61 and with two inlets 62 and 63 and two liquid outlets 64 and 65, the unused inlets being closed by threaded plugs 63a and 65a. Two flat bases 66 and 67 for fixing the pump cartridge protrude upwards, surrounding central fluid inlet connections 68 and 69. The bases 66 and 67 have threaded holes 14 on their upper flat face 17a. receiving screws such as screws 12 or 44 shown in Figures 1 and 2 and in Figure 3. A receiving bore 15 similar to that shown in Figures 1 and 2 is provided inside the bases, this bore 15 opening at its periphery on a flat shoulder 25 for receiving the valve plate 27 and, on the side opposite to a partition 70 (also shown in Figures 1 and 2), on a passage 71 towards the discharge. In FIG. 3, each of the bores 15 is shown, equipped at its bottom end with a non-return valve 26 held in position by a flange 40 fixed by screws 12 on the flat base 66 or 67. Each of the flanges 40, of the same type as that shown in FIG. 2, is ready to receive a removable cartridge 1 of stators and rotors.

On voit nettement sur la partie libérée par des arrachements qu'une vanne ou un robinet 72 de répartition de l'aspiration est monté dans un alésage 73 ouvert sur l'extérieur et fermé par un manchon 74 pour laisser passer vers l'extérieur, de façon étanche, une poignée de manoeuvre 75. Le robinet 72 est monté sur la liaison entre une chambre d'admission 76 à l'intérieur du carter 60 et un canal 77 de distribution de l'admission vers les raccords d'admission 68 et 69. La partie active du robinet 72 comporte deux extrémités cylindriques 78 et 79 servant de guidage dans l'alésage 73 et une partie centrale évidée 80 qui ménage deux passages 81 et 82 vers chacun des raccords d'aspiration 68 et 69. La partie pleine 84, de forme évasée et à arête centrale verticale 83, de la partie centrale évidée 80 peut venir obturer, en s'appuyant sur une portée 85, le passage vers le raccord 68 et, en s'appuyant sur une portée 86, le passage vers le raccord 69. En s'appuyant simultanément sur les portées 85 et 86, la partie pleine 84 obture simultanément l'admission vers les deux raccords d'admission 68 et 69.It is clearly seen on the part released by cutouts that a valve or a valve 72 for distributing the suction is mounted in a bore 73 open on the outside and closed by a sleeve 74 to allow passage to the outside, from sealingly, an operating handle 75. The tap 72 is mounted on the connection between an intake chamber 76 inside the housing 60 and a channel 77 for distributing the intake to the intake fittings 68 and 69 The active part of the tap 72 has two cylindrical ends 78 and 79 serving as a guide in the bore 73 and a hollowed-out central part 80 which provides two passages 81 and 82 to each of the suction fittings 68 and 69. The solid part 84 , of flared shape and with vertical central edge 83, of the hollowed-out central part 80 can come to close, by relying on a bearing 85, the passage towards the fitting 68 and, by relying on a bearing 86, the passage to the fitting 69. By pressing simultaneously on the bearing surfaces 85 and 86, the solid part 84 simultaneously blocks the admission to the two intake fittings 68 and 69.

Lorsque le bloc à deux pompes 60 est en service sur une seule pompe, par exemple celle fixée sur le socle 66, et que cette pompe est défaillante, il est possible de mettre en marche l'autre pompe, de façon manuelle ou automatique, sans risquer de refoulement sur la pompe défaillante grâce au clapet anti-retour 26. Si l'on souhaite changer la cartouche hydraulique amovible 1 de la pompe défaillante, il suffit de faire tourner le robinet 72 par sa poignée de manoeuvre 75 pour amener la partie pleine 84 à obturer le passage vers le raccord d'admission 68. Après dépose de la cartouche amovible, le clapet anti-retour 26 monté au fond de l'alésage 15 du socle 66 empêche tout écoulement de fluide en provenance du refoulement par l'autre pompe alors en service, et il est possible de mettre en place une nouvelle cartouche hydraulique sans fuite de fluide. Après remise en place de la cartouche hydraulique et de son moteur d'entraînement, on peut remettre la pompe en service pour refouler le liquide pompé à travers le clapet anti-retour 26. Si le bloc de pompe marche à deux pompes en parallèle, en cas de défaillance de l'une des deux pompes, il est possible de passer à la marche à une pompe, de démonter la pompe défaillante sans fuite et de la remplacer par une pompe en état de marche qui sera ensuite remise en service pour reprendre la marche à deux pompes. La disposition du clapet anti-retour selon l'invention permet, dans tous les cas, de disposer d'un groupe de pompage plus compact, plus fiable, plus facile à dépanner et partant plus économique.When the block with two pumps 60 is in service on a single pump, for example that fixed on the base 66, and this pump is faulty, it is possible to start the other pump, manually or automatically, without risk of backflow on the faulty pump thanks to the non-return valve 26. If you want to change the removable hydraulic cartridge 1 of the faulty pump, simply turn the valve 72 by its operating handle 75 to bring the full part 84 to close the passage to the inlet fitting 68. After removing the removable cartridge, the non-return valve 26 mounted at the bottom of the bore 15 of the base 66 prevents any flow of fluid from the delivery by the other pump then in service, and it is possible to install a new hydraulic cartridge without leaking fluid. After replacing the hydraulic cartridge and its drive motor, the pump can be put back into service to discharge the pumped liquid through the non-return valve 26. If the pump unit operates with two pumps in parallel, in in the event of a failure of one of the two pumps, it is possible to switch over to a pump, dismantle the faulty pump without leakage and replace it with a pump in working condition which will then be put back into service to resume operation. works with two pumps. The arrangement of the non-return valve according to the invention makes it possible, in all cases, to have a pumping group which is more compact, more reliable, easier to troubleshoot and therefore more economical.

On peut prévoir de même des blocs multiples à plus de deux pompes verticales en parallèle. On a représenté en coupe transversale sur la figure 6 la disposition du bloc à pompes multiples au droit de l'une des pompes. Un raccord d'aspiration 90 relié à l'aspiration commune débouche sur une entrée d'aspiration 91 ménagée dans un bloc de commutation 92 tournant de façon étanche dans un alésage grâce à au moins un joint annulaire 92a et relié, via une tige traversant de façon étanche un couvercle 94, à un levier extérieur de commutation 95. En faisant tourner le bloc 92 par action sur le levier 95, on peut ainsi isoler l'aspiration d'une pompe quelconque qui ne fonctionne pas ou bien sur laquelle il est nécessaire de procéder à un entretien ou à une réparation. Le clapet anti-retour de chaque pompe, monté selon l'invention à l'aide de la plaque rigide 27 et de la rondelle annulaire 29, isole la chambre de refoulement commune 71, traversée par la tige du levier 95, du circuit de la pompe arrêtée ou bien de la pompe sur laquelle on procède à une réparation ou à un échange. Le bloc tournant 92 joue le rôle d'un robinet à deux positions: aspiration ouverte et aspiration fermée, commandé indépendamment pour chaque pompe par le levier extérieur 95 ou par tout autre dispositif équivalent adéquat, le cas échéant télécommandé.Likewise, multiple blocks can be provided for more than two vertical pumps in parallel. There is shown in cross section in Figure 6 the arrangement of the multiple pump block to the right of one of the pumps. A suction fitting 90 connected to the common suction leads to a suction inlet 91 formed in a switching block 92 turning in a sealed manner in a bore thanks to at least one annular seal 92a and connected, via a rod sealingly passing through a cover 94, to an external switching lever 95. By rotating the block 92 by action on the lever 95, it is thus possible to isolate the suction of any pump that does not work or on which it is necessary to carry out maintenance or repair. The non-return valve of each pump, mounted according to the invention using the rigid plate 27 and the annular washer 29, isolates the common delivery chamber 71, crossed by the rod of the lever 95, from the circuit of the pump stopped or the pump on which a repair or exchange is carried out. The rotary block 92 acts as a valve with two positions: open suction and closed suction, controlled independently for each pump by the external lever 95 or by any other suitable equivalent device, if necessary remote-controlled.

Bien entendu, la présente invention n'est pas limitée aux modes de réalisation décrits et représentés mais elle est susceptible de nombreuses variantes accessibles à l'homme de l'art sans que l'on ne s'écarte de l'esprit de l'invention.Of course, the present invention is not limited to the embodiments described and shown but it is capable of numerous variants accessible to those skilled in the art without departing from the spirit of the invention.

Claims (11)

1.- Ensemble de pompe centrifuge verticale, notamment de pompe centrifuge multicellulaire, constitué d'au moins une cartouche amovible d'ensemble hydraulique centrifuge formant un bloc serré entre deux flasques à bride et monté, à axe vertical, fixé par sa bride de flasque et engagé par un manchon de flasque dans un alésage de réception d'un corps de pompe où la cartouche est raccordée respectivement, au centre de l'alésage, à un raccord central d'aspiration de la pompe et, au bord de l'alésage, à une sortie de refoulement de la pompe, caractérisé en ce qu'un clapet anti-retour (26) annulaire plat et s'ouvrant dans le sens du refoulement de la pompe est disposé au fond de l'alésage de réception (15) entre la paroi intérieure dudit alésage et la paroi extérieure du raccord central d'aspiration (34).1.- Set of vertical centrifugal pump, in particular multicellular centrifugal pump, consisting of at least one removable cartridge of centrifugal hydraulic assembly forming a block clamped between two flange flanges and mounted, with vertical axis, fixed by its flange flange and engaged by a flange sleeve in a bore for receiving a pump body where the cartridge is connected respectively, at the center of the bore, to a central suction connection of the pump and, at the edge of the bore , at a discharge outlet of the pump, characterized in that a flat annular non-return valve (26) opening in the direction of discharge of the pump is disposed at the bottom of the receiving bore (15) between the inner wall of said bore and the outer wall of the central suction fitting (34). 2.- Ensemble de pompe selon la revendication 1, caractérisé en ce que le clapet anti-retour (26) est maintenu en position axiale sur un premier épaulement (25) ménagé au fond de l'alésage de réception (15) et sur un deuxième épaulement (33) ménagé sur la paroi extérieure du raccord central d'aspiration (34), par des moyens de retenue (35, 36, 40) aptes à maintenir le clapet anti-retour (26) en service à l'encontre de la pression de refoulement après dépose de la cartouche amovible d'ensemble hydraulique (1).2.- pump assembly according to claim 1, characterized in that the non-return valve (26) is held in axial position on a first shoulder (25) formed at the bottom of the receiving bore (15) and on a second shoulder (33) formed on the outer wall of the central suction connector (34), by retaining means (35, 36, 40) capable of holding the non-return valve (26) in service against the discharge pressure after removal of the removable hydraulic assembly cartridge (1). 3.- Ensemble de pompe selon la revendication 1 ou 2, caractérisé en ce que le clapet anti-retour (26) est constitué, d'une part, d'une plaque annulaire plane rigide (27), par exemple en métal, percée d'au moins un trou de passage (28) et dont la périphérie cylindrique extérieure est sensiblement ajustée dans l'alésage de réception (15) tandis que sa périphérie frontale est en appui sur un premier épaulement (25) ménagé au fond de l'alésage de réception (15) et, d'autre part, d'un anneau flexible plan (29) appliqué sur ladite plaque annulaire du côté opposé à la cartouche amovible (1), à l'intérieur du corps de pompe (13), pour obturer le ou les trous de passage (28), ledit anneau flexible étant en appui, à sa partie périphérique intérieure, sur un deuxième épaulement annulaire plan (33) ménagé sur la paroi extérieure du raccord central d'aspiration (34).3.- pump assembly according to claim 1 or 2, characterized in that the non-return valve (26) consists, on the one hand, of a rigid flat annular plate (27), for example made of metal, pierced at least one through hole (28) and whose outer cylindrical periphery is substantially adjusted in the receiving bore (15) while its front periphery is supported on a first shoulder (25) formed at the bottom of the receiving bore (15) and, on the other hand, a flat flexible ring (29) applied to said annular plate on the side opposite to the removable cartridge (1), inside the pump body (13), for closing the passage hole (s) (28), said flexible ring being resting, at its inner peripheral part, on a second flat annular shoulder (33) formed on the outer wall of the central suction connector (34). 4.- Ensemble de pompe selon la revendication 3, caractérisé en ce que l'anneau flexible plan est constitué d'une rondelle en élastomère (29) maintenue appliquée sur la plaque rigide (27) par un anneau central rigide de maintien (32) interposé entre l'anneau flexible et le deuxième épaulement (33), ledit anneau central (32) présentant un diamètre extérieur nettement inférieur à celui sur lequel sont disposés le ou les trous de passage (28).4.- pump assembly according to claim 3, characterized in that the flexible planar ring consists of an elastomer washer (29) maintained applied to the rigid plate (27) by a rigid central retaining ring (32) interposed between the flexible ring and the second shoulder (33), said central ring (32) having an outside diameter significantly smaller than that on which the passage hole or holes (28) are arranged. 5.- Ensemble de pompe selon la revendication 3, caractérisé en ce que l'anneau flexible plan est constitué par une plaque circulaire mince (29') munie d'un trou central (87) et de fentes radiales (29a) ouvertes vers l'extérieur et qui s'étendent jusqu'à une couronne continue (29b) ménagée autour du trou central (87), de manière à constituer une série de clapets à lamelle disposés radialement, chacun en face d'au moins l'un des trous de passage (28).5.- pump assembly according to claim 3, characterized in that the flexible planar ring is constituted by a thin circular plate (29 ') provided with a central hole (87) and radial slots (29a) open towards the 'exterior and which extend to a continuous ring (29b) formed around the central hole (87), so as to constitute a series of radially arranged lamella valves, each facing at least one of the holes passage (28). 6.- Ensemble de pompe selon l'une des revendications 3 à 5, caractérisé en ce que la plaque annulaire plane (27) est maintenue en butée sur le premier (25) et sur le deuxième (33) épaulements, respectivement par un premier anneau élastique ou "circlips" (35) logé dans une rainure ménagée dans la paroi de l'alésage de réception (15) et par un deuxième anneau élastique ou "circlips" (36) logé dans une rainure ménagée sur la paroi cylindrique extérieure du raccord central d'aspiration (34).6.- pump assembly according to one of claims 3 to 5, characterized in that the planar annular plate (27) is held in abutment on the first (25) and on the second (33) shoulders, respectively by a first elastic ring or "circlip" (35) housed in a groove made in the wall of the receiving bore (15) and by a second elastic ring or "circlip" (36) housed in a groove made on the outer cylindrical wall of the central suction connection (34). 7.- Ensemble de pompe selon l'une des revendications 3 à 5, caractérisé en ce que la plaque annulaire plane (27) est maintenue en butée sur le premier (25) et sur le deuxième (33) épaulements par l'appui frontal, d'une part, à sa périphérie extérieure hors de la zone du ou des trous de passage (28), d'une première portée annulaire ménagée sur un manchon d'extrémité (16) du flasque inférieur (7) de ladite cartouche amovible (1), engagé dans l'alésage de réception (15), et, d'autre part, à sa périphérie intérieure, d'une deuxième portée annulaire ménagée sur le raccord central d'aspiration (21) du flasque inférieur (7) de la cartouche amovible (1).7.- Pump assembly according to one of claims 3 to 5, characterized in that the planar annular plate (27) is held in abutment on the first (25) and on the second (33) shoulders by the front support on the one hand, at its outer periphery outside the region of the passage hole (s) (28), a first annular bearing formed on an end sleeve (16) of the lower flange (7) of said removable cartridge (1), engaged in the receiving bore (15), and, on the other hand, at its inner periphery, a second annular bearing formed on the central suction connection (21) of the lower flange (7) of the removable cartridge (1). 8.- Ensemble de pompe selon l'une des revendications 3 à 5, caractérisé en ce que la plaque annulaire plane (27) est maintenue en butée sur le premier (25) et sur le deuxième (33) épaulements par l'appui frontal, d'une part, à sa périphérie extérieure hors de la zone du ou des trous de passage (28), d'une première portée annulaire (47) d'un manchon d'extrémité (45) d'un flasque de maintien (40), identique ou similaire au flasque inférieur (7) de ladite cartouche amovible, engagé dans l'alésage de réception (15) et, d'autre part, à sa périphérie intérieure, d'une deuxième portée annulaire (49) ménagée sur le raccord central d'aspiration (21a) dudit flasque de maintien (40), et en ce que le flasque de maintien (40) comporte un alésage de réception (51) du manchon (16) du flasque inférieur (7) de la cartouche amovible (1).8.- pump assembly according to one of claims 3 to 5, characterized in that the planar annular plate (27) is held in abutment on the first (25) and on the second (33) shoulders by the front support on the one hand, at its outer periphery outside the region of the passage hole (s) (28), a first annular bearing surface (47) of an end sleeve (45) of a retaining flange ( 40), identical or similar to the lower flange (7) of said removable cartridge, engaged in the receiving bore (15) and, on the other hand, at its inner periphery, a second annular bearing (49) formed on the central suction connection (21a) of said retaining flange (40), and in that the retaining flange (40) has a receiving bore (51) of the sleeve (16) of the lower flange (7) of the cartridge removable (1). 9.- Unité de pompage à au moins deux pompes centrifuges verticales, à cartouche hydraulique amovible, montées sur un carter commun d'aspiration et de refoulement, lesdites pompes étant susceptibles de fonctionner simultanément et/ou séparément, caractérisée en ce que chaque pompe verticale est constituée par un ensemble de pompe centrifuge selon l'une des revendications 2 à 8.9.- Pumping unit with at least two vertical centrifugal pumps, with removable hydraulic cartridge, mounted on a common suction and discharge casing, said pumps being capable of operating simultaneously and / or separately, characterized in that each vertical pump is constituted by a centrifugal pump assembly according to one of claims 2 to 8. 10.- Unité de pompage selon la revendication 9, caractérisée en ce que le carter commun (60) comporte un robinet distributeur intégré (72) de l'aspiration des pompes, à quatre positions, correspondant respectivement: à l'isolement de l'aspiration des deux pompes, à la liaison des deux pompes à l'aspiration et à la liaison à l'aspiration de l'une des deux pompes tandis que l'autre pompe est isolée de l'aspiration, de telle manière qu'après l'isolement de l'aspiration de l'une des pompes, alors que l'autre pompe reste en service, la cartouche d'ensemble hydraulique (1) de la pompe isolée puisse être déposée en étant isolée de la pression de refoulement par le clapet anti-retour (26).10.- Pumping unit according to claim 9, characterized in that the common housing (60) comprises an integrated distributor valve (72) of the suction of the pumps, with four positions, corresponding respectively: to the isolation of the suction of the two pumps, the connection of the two pumps to the suction and the connection to the suction of one of the two pumps while the other pump is isolated from the suction, so that after the isolation of the suction of one of the pumps, while the other pump remains in service, the hydraulic assembly cartridge (1) of the isolated pump can be removed by being isolated from the discharge pressure by the valve non-return (26). 11.- Unité de pompage selon la revendication 9, caractérisée en ce que le carter commun comporte, pour chaque pompe centrifuge verticale, un robinet (92) à deux positions: ouverture et respectivement fermeture de l'aspiration de la pompe, susceptible d'être commandé (levier 95) indépendamment pour chaque pompe qui est munie du clapet anti-retour intégré apte à l'isoler du refoulement commun (71).11.- pumping unit according to claim 9, characterized in that the common housing comprises, for each vertical centrifugal pump, a tap (92) with two positions: opening and respectively closing of the suction of the pump, capable of being controlled (lever 95) independently for each pump which is provided with the integrated non-return valve suitable for 'isolate from the common discharge (71).
EP91400981A 1990-04-24 1991-04-12 Vertical centrifugal pump module Expired - Lifetime EP0454529B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005194A FR2661218B1 (en) 1990-04-24 1990-04-24 VERTICAL CENTRIFUGAL PUMP ASSEMBLY.
FR9005194 1990-04-24

Publications (2)

Publication Number Publication Date
EP0454529A1 true EP0454529A1 (en) 1991-10-30
EP0454529B1 EP0454529B1 (en) 1994-06-22

Family

ID=9396020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400981A Expired - Lifetime EP0454529B1 (en) 1990-04-24 1991-04-12 Vertical centrifugal pump module

Country Status (8)

Country Link
US (1) US5201633A (en)
EP (1) EP0454529B1 (en)
AT (1) ATE107742T1 (en)
DE (1) DE69102580T2 (en)
DK (1) DK0454529T3 (en)
ES (1) ES2027944T3 (en)
FR (1) FR2661218B1 (en)
GR (1) GR920300021T1 (en)

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DE10322382A1 (en) * 2003-05-17 2004-12-02 Ksb Aktiengesellschaft Multi-stage centrifugal pump
US8128340B2 (en) * 2004-03-08 2012-03-06 Gorman-Rupp, Co. Stacked self-priming pump and centrifugal pump
US20090246039A1 (en) * 2006-01-09 2009-10-01 Grundfos Pumps Corporation Carrier assembly for a pump
US7507066B2 (en) * 2006-03-27 2009-03-24 Koenig Kevin J Pump header body and modular manifold
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US8435016B2 (en) 2010-11-10 2013-05-07 Hamilton Sundstrand Corporation Vertical shaft pumping system with lubricant impeller arrangement
WO2014171809A2 (en) * 2013-04-19 2014-10-23 Bombas Internacionales Mexicanas, S.A De C.V. Vertical in-line multistage centrifugal pump
EP3171033A1 (en) * 2015-11-19 2017-05-24 Grundfos Holding A/S Multistage centrifugal pump with casing opening for the maintenance of an axial thrust balancing piston
EP3181908B1 (en) * 2015-12-17 2020-05-13 Grundfos Holding A/S Multi-stage centrifugal pump having tension anchors made of sheet metal
US11118584B2 (en) * 2016-06-29 2021-09-14 Itt Manufacturing Enterprises Llc Ring section pump having intermediate tie rod combination
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Also Published As

Publication number Publication date
ATE107742T1 (en) 1994-07-15
ES2027944T1 (en) 1992-07-01
DK0454529T3 (en) 1994-07-25
GR920300021T1 (en) 1992-08-25
FR2661218B1 (en) 1992-07-31
EP0454529B1 (en) 1994-06-22
DE69102580T2 (en) 1994-10-20
ES2027944T3 (en) 1994-11-01
FR2661218A1 (en) 1991-10-25
US5201633A (en) 1993-04-13
DE69102580D1 (en) 1994-07-28

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