EP3749861B2 - Pompe à vis sans fin excentrique - Google Patents

Pompe à vis sans fin excentrique

Info

Publication number
EP3749861B2
EP3749861B2 EP19700342.9A EP19700342A EP3749861B2 EP 3749861 B2 EP3749861 B2 EP 3749861B2 EP 19700342 A EP19700342 A EP 19700342A EP 3749861 B2 EP3749861 B2 EP 3749861B2
Authority
EP
European Patent Office
Prior art keywords
housing
pump
stator
connecting shaft
seal
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.)
Active
Application number
EP19700342.9A
Other languages
German (de)
English (en)
Other versions
EP3749861A1 (fr
EP3749861B1 (fr
Inventor
Dirk Overmeier
Peter McGarian
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.)
Seepex GmbH
Original Assignee
Seepex GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Seepex GmbH filed Critical Seepex GmbH
Publication of EP3749861A1 publication Critical patent/EP3749861A1/fr
Application granted granted Critical
Publication of EP3749861B1 publication Critical patent/EP3749861B1/fr
Publication of EP3749861B2 publication Critical patent/EP3749861B2/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F04C2230/604—Mounting devices for pumps or compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/70—Disassembly methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/60—Shafts

Definitions

  • An eccentric screw pump is a type of rotary positive displacement pump used to pump a wide variety of media, particularly highly viscous liquids, in diverse industrial sectors. These liquids can also contain solids.
  • the stator is preferably made of elastic or elastomeric material and is generally surrounded by a one-piece or multi-piece stator casing or housing. Alternatively, stators made of other materials, e.g., metal, are also used.
  • the pump housing connected to the stator on the suction side is generally referred to as the suction housing, and the housing connected to the stator on the pressure side, e.g., as the pressure port.
  • the suction housing as the suction housing is independent of the actual flow direction. This is the housing located between the stator and the drive.
  • the rotating connection which simultaneously ensures eccentricity, between the drive or the connecting shaft on the one hand and the rotor on the other is achieved via a coupling rod located in the pump housing, which is connected, e.g., to the connecting shaft via a joint on the drive side and to the rotor via a joint on the rotor side.
  • the eccentricity can also be achieved by other means (i.e., without joints), for example, by a flexible/flexible connecting rod.
  • a connecting rod therefore, refers to an element that ensures the eccentricity of the rotor or enables the eccentric movement between the rotating connecting shaft and the rotor. It is also fundamentally within the scope of the invention that this connecting rod is formed integrally with the connecting shaft and/or with the rotor.
  • the connecting shaft is also referred to as a plug shaft; it is generally connected directly to the output shaft of the drive and serves as a connecting piece between the output shaft of the drive and the power transmission components of the pump.
  • the connecting housing arranged between the pump housing (suction housing) and the drive is also referred to in practice as a "lantern.” This serves, for example, to accommodate, secure, and support the pump housing on the one hand and the drive on the other, so that this connecting housing or lantern...
  • the connecting housing is mounted, for example, on a base plate or directly on a foundation, and supports and carries the drive and the pump housing. Suspended arrangements are also possible.
  • This connecting housing is designed as an open or at least as an openable connecting housing, which is therefore accessible from the outside through an opening.
  • the connecting housing is separate from the pump housing, so that, for example, the pump housing is attached to the connecting housing by means of screws or the like.
  • the invention also encompasses embodiments in which the pump housing and connecting housing are formed in one piece and are therefore inseparable from each other.
  • the progressive cavity pump For the operation of the progressive cavity pump, it is usually installed in a (pipe) piping system, so that, for example, a suction line is connected to the suction housing (i.e., the inlet or outlet opening) and a pressure line is connected to the pressure port of the pump.
  • a suction line is connected to the suction housing (i.e., the inlet or outlet opening) and a pressure line is connected to the pressure port of the pump.
  • the stator of the progressive cavity pump can be designed as a longitudinally split stator consisting of at least two stator shells, e.g., stator half-shells. Furthermore, the stator can be replaceable separately from the stator casing and therefore not rigidly, and in particular not metallurgically, connected to the stator casing. This allows the elastomeric stator to be replaced separately from the stator casing without requiring complex disassembly of the pump.
  • the stator casing consists, for example, of at least... Two shell segments, which together form a stator clamping device, allow the stator to be clamped radially against the rotor.
  • the stator shell can consist of, for example, three or four shell segments forming the clamping device.
  • An eccentric screw pump of this type is, for example, made of... WO 2009/024279 A1 or DE 10 2014 112 550 B4 known.
  • an eccentric screw pump with rotor separation is known.
  • the rotor is detachably connected to the coupling joint or a joint component thereof without disassembling the coupling joint.
  • Such pumps with rotor separation are also included in a preferred embodiment of the invention.
  • the connecting shaft is sealed with a mechanical seal (preferably a single-acting one).
  • a mechanical seal is subject to wear and must therefore be replaced or repaired as a consumable part.
  • the installation of the mechanical seal, or a new mechanical seal with its housing is only possible with the suction housing and suction line removed, as otherwise, damage to the stationary counter ring of the mechanical seal is likely when inserting the connecting shaft through the housing. Therefore, there is a need to simplify the replacement or maintenance of the mechanical seal in such an eccentric screw pump.
  • a generic eccentric screw pump is also available from the DE 102005 039 618 A1
  • the pump is known.
  • the disassembly, especially of the rotor unit, e.g., for cleaning purposes, is to be facilitated.
  • the rotor drive shaft is arranged inside a hollow shaft that passes through the sealing unit.
  • the invention is based on the objective of creating an eccentric screw pump of the type described above, which, despite its simple design, is characterized by optimized maintenance and repair options, particularly in the area of the mechanical seal.
  • the sealing housing of the mechanical seal is designed as an (axially) split sealing housing and comprises, on the one hand, a base housing which, in the assembled state, surrounds the sliding ring and is attached to the pump housing and/or the connecting housing, and on the other hand, a housing cover which carries the counter ring.
  • the housing cover (together with the counter ring) is detachably attached to the base housing, so that the housing cover, together with the counter ring, can be separated from and reattached to the base housing.
  • the sealing housing is therefore designed in such a way that the connecting shaft with the sliding ring attached thereto (without the counter ring) can be pulled out of the sealing housing.
  • the mechanical seal is preferably designed as a single-acting mechanical seal, i.e., with a single sealing surface formed between a single sliding ring and a single counter ring.
  • Single-acting mechanical seal therefore refers, within the scope of the invention, to a mechanical seal with a single sliding ring-counter ring pair.
  • the housing cover (with the counter ring attached to it) can be removed directly from the open or opened connecting housing, and in this way, all parts of the mechanical seal can be serviced or replaced, preferably without disassembling the pump housing and the connected piping system, and without disassembling the drive.
  • the two-part mechanical seal housing according to the invention also offers advantages during subsequent assembly, because the connecting shaft (plug shaft) with the attached sliding ring can be threaded into the mechanical seal housing, namely into the stationary base housing, without the risk of damaging the mating ring, since this mating ring remains detached from the base housing during assembly. Only after the connecting shaft has been inserted (and centered), and preferably only after the connecting shaft has been placed on or inserted into the output shaft of the drive, is the housing cover with the stationary mating ring attached to the base housing, so that there is no risk of damage during the initial threading of the connecting shaft. Overall, the design according to the invention allows for... Maintenance work on the mechanical seal of the progressive cavity pump can be carried out easily and quickly, enabling particularly economical operation of the pump.
  • the design according to the invention particularly allows the rotating unit, or a part thereof, consisting of at least the connecting shaft and preferably also the coupling rod (optionally with joints) arranged between the rotor and the connecting shaft, to be pulled out of the pump housing in a single unit in the axial direction during maintenance work, after the housing cover of the sealing housing has been detached from the base housing.
  • the rotating unit preferably refers to the unit rotating during operation, which can be completely separated from the drive and consists of at least the connecting shaft, the coupling rod (optionally with joints), and the rotor.
  • the rotating unit with sliding ring
  • the part of the rotating unit arranged in the suction housing can be pulled out in an axial direction through the housing opening of the pump housing facing the stator.
  • the pump stator can be removed without having to remove the drive, suction housing, and suction line.
  • the discharge line or discharge port may need to be removed to dismantle the stator, after which the described maintenance of the mechanical seal can be carried out via the suction housing as described.
  • This option is also attractive if some disassembly work is required in the area of the discharge housing or discharge lines, for example, if disassembling the suction line (e.g., the hopper in hopper pumps) or the drive would be much more complex than disassembling the discharge line.
  • the invention is particularly advantageous in embodiments where the pump stator can be removed without having to remove the drive, the pressure line, the suction line, or the suction housing.
  • Various practical solutions for this are known. With such solutions, the mechanical seal can be serviced or replaced as described without having to dismantle any part of the piping system.
  • the invention is particularly advantageous in such embodiments.
  • the invention is particularly preferred in an eccentric screw pump with a longitudinally split stator, which consists, for example, of several (elastic) stator segments, such as stator half-shells and/or several shell segments (as a stator clamping device).
  • a longitudinally split stator which consists, for example, of several (elastic) stator segments, such as stator half-shells and/or several shell segments (as a stator clamping device).
  • stator segments such as stator half-shells and/or several shell segments (as a stator clamping device.
  • it is particularly easy to remove or partially remove only the stator, thus providing access to the rotating unit via the stator-side opening of the pump housing (suction housing). After separating the sealing housing, the rotating unit can then be completely removed. In principle, it is possible to remove the entire rotating unit, including the rotor.
  • the rotor is first separated from the rotating unit or the remaining part of the rotating unit, so that the remaining part of the rotating unit (connecting shaft and coupling rod, optionally with joints) can then be pulled out of the pump housing as a single unit.
  • This is achieved, for example, by separating the coupling joint on the rotor side, thereby removing the rotor from the coupling rod.
  • the invention is particularly advantageous for eccentric screw pumps with rotor separation (e.g. according to EP 2 428 680 B1 This is achieved by connecting the rotor to the rotor-side coupling joint in a way that allows for detachment without disassembling the joint itself, by creating a separation point separate from the joint.
  • the rotor can be separated from the rotating unit without disassembling the joint, leaving the connecting shaft with the coupling rod, including both joints and the so-called rotor head, which is detachable from the rotor, as the rotating unit. This is illustrated in the figure description.
  • the invention also offers advantages for pumps where the assembly or disassembly of the suction line of the suction housing is very complex, e.g., for hopper pumps, which may be mounted under silos.
  • hopper pumps the inlet and outlet openings are formed by a hopper, and additional conveying devices may be arranged in the suction housing, e.g., on the coupling rod.
  • the base housing of the (single-acting) mechanical seal according to the invention is preferably hollow cylindrical.
  • the housing cover is also preferably hollow cylindrical or annular, so that it has a central opening through which the connecting shaft can pass.
  • the mating ring is fixed to the housing cover in a rotationally fixed manner, preferably by being inserted into the mating ring with an interposed seal.
  • the housing cover is preferably detachably fastened to the base housing by means of (positive-locking and/or force-locking) fasteners. These may be, for example, screws and/or locking devices and/or clamping devices.
  • the drive of an eccentric screw pump typically has an output shaft, to the pump-side output end of which the connecting shaft is detachably attached with its drive-side shaft end.
  • the drive's output shaft therefore projects into the connecting housing, so that the connecting shaft is coupled to the drive's output shaft within the connecting housing.
  • a preferred embodiment provides that the output end (of the output shaft) is spaced from the base housing of the mechanical seal (in the assembled state) such that the housing cover of the mechanical seal housing can be removed from the connecting housing between the output end (of the output shaft) and the base housing when the connecting shaft is disassembled. This can then be removed.
  • the housing cover preferably including the attached counter ring
  • the housing cover have a length or overall length L in the axial direction that is less than the axial distance A between the output end of the drive shaft and the base housing of the mechanical seal. Consequently, after the connecting shaft has been pulled out of the connecting housing, the housing cover with the attached counter ring can be guided between the stationary base housing and the output shaft and removed from the connecting housing, e.g., for replacement purposes.
  • the invention also encompasses alternative embodiments in which the described axial distance A is less than the described overall length L. This is because it is also possible to detach the counter ring of the mechanical seal from the housing cover before removing it radially from the connecting housing, so that it can be removed separately from the connecting housing and subsequently replaced.
  • the invention relates to a method for the maintenance (or inspection) and/or replacement of a mechanical seal of a progressive cavity pump of the type described.
  • the housing cover is first detached from the base housing (for disassembly) through the (end-face) open or opened connecting housing.
  • the connecting shaft with the sliding ring arranged on the connecting shaft is removed axially from the connecting housing and, more preferably, through the end-face opening of the pump housing.
  • the already described rotating unit of the progressive cavity pump (including the connecting shaft), optionally after prior separation of the rotor, is removed axially through the pump housing, e.g., after the stator has been removed, for example, in the case of a pump with a longitudinally split stator.
  • the method according to the invention also relates to the assembly of the connecting shaft or the rotating unit (e.g., after replacement of the sliding ring and/or the counter ring).
  • the connecting shaft or rotating unit is first inserted into the connecting housing (through the opening at the end face), passing through the base housing and the detached housing cover, and then, for example, attached to or inserted into the output shaft of the drive. Only then is the housing cover attached to the base housing. This procedure has the significant advantage of preventing damage to the mechanical seal or the mating ring on the housing cover, as it is not permanently mounted but (temporarily) loosely arranged in the connecting housing.
  • the invention proposes removing the rotating unit from the pump housing during disassembly using an assembly tool (specifically designed for this purpose) and/or inserting it into the pump housing during assembly.
  • an assembly tool has at least a plate-shaped or cup-shaped receptacle for the rotating unit and a handle attached thereto. Details are described by way of example in the description of the figures.
  • FIG. 1 The diagram shows a simplified representation of a progressive cavity pump, which in its basic structure comprises a stator 1, a rotor 2 rotating within the stator 1, and a drive 3 for the rotor 2.
  • a pump housing 4 referred to as the suction housing 4
  • a housing part connected to the stator 1 on the pressure side is referred to, for example, as the connection port or pressure port 5.
  • the pump housing 4 has an inlet opening (or, depending on the operating direction, an outlet opening) 6, through which, for example, the medium to be pumped is supplied. This medium is then conveyed from the pump housing 4 via the stator/rotor to the pressure port 5.
  • the pump housing 4 has a (front-facing) opening 7 on the stator side, through which the medium enters the stator 1 from the pump housing 4.
  • the drive 3 is equipped with an output shaft 8, which is connected to a connecting shaft 9.
  • the connecting shaft 9 is designed as a plug-in shaft.
  • the rotor 2 is connected to the connecting shaft 9 via a coupling rod 10.
  • the coupling rod 10 is connected to the connecting shaft 9 via a drive-side joint 11 and to the rotor 2 via a rotor-side joint 12.
  • the coupling rod 10 and the joints 11 and 12 enable the eccentric movement of the rotor 2 and its rotor end, respectively.
  • This connecting housing 14 is designed to be open, in the exemplary embodiment open at the sides, i.e., it has lateral openings. However, it is also possible for these (lateral, upper, and/or lower) openings to be closable, so that the connecting housing can also be designed as a closed, but openable, housing.
  • the connecting shaft 9 is sealed with a shaft seal, which is designed as a mechanical seal 13, specifically as a single-acting mechanical seal 13.
  • This mechanical seal 13, which is of particular importance according to the invention, will be described in more detail below.
  • the coupling rod 10 is arranged (essentially) inside the pump housing 4, while the connecting shaft 9 is arranged (essentially) inside the connecting housing 14.
  • the mechanical seal 13 is also arranged (essentially) inside the connecting housing 14.
  • the stator 1 is designed as a longitudinally split stator and, in this embodiment, consists of two stator half-shells 1a, 1b, which are only indicated. Longitudinally split means along or parallel to the stator's longitudinal axis.
  • the stator is at least partially surrounded by a stator shell 15, which in this embodiment is designed as a longitudinally split shell and has several shell segments 16 that serve as clamping segments and form a stator clamping device. Details of this are not shown; they can be found, for example, in the DE 10 2014 112 550 B4 or the WO 2009/024279 A1 known. However, the invention can also be implemented with other stator designs.
  • FIG. 1 an exemplary embodiment with rotor separation (according to EP 2 428 680 B1 ) is realized.
  • the rotor 2 can be separated from the coupling rod 10 without disassembling the joint 12, because an additional separation point is realized with the rotor head 17 shown in the figures.
  • the rotor 2 is therefore detachably connected to the rotor head 17 without disassembling the coupling joint 12, which in turn is connected to the coupling joint 12.
  • Figs. 2 to 4 The figures now show a functional position in which the rotor 2 has already been separated from the rotor head 17 and thus from the remaining part of the rotating unit.
  • the mechanical seal 13 has a sealing housing 18 which is attached to the pump housing 4 and/or the connecting housing 14, for example, by being clamped between these two housings 4, 14 during the fastening of the pump housing 4 to the connecting housing 14, and projecting into the interior of the connecting housing 14. Furthermore, the mechanical seal 13 has a sliding ring 19 which is fixed to the shaft 9 and rotates within the sealing housing 18, as well as a stationary counter ring 20 attached to the sealing housing 18. The sliding ring 19 is pressed against the counter ring 20 by a spring element 21, adjustable via an adjusting ring 22. The sliding ring 19, spring element 21, and adjusting ring 22 are generally arranged on a support sleeve 23, which is... B.
  • the sealing housing 18 is designed as an (axially) split sealing housing. It comprises, on the one hand, a base housing 18a which surrounds the sliding ring 19 in the assembled state, and on the other hand, a housing cover 18b which supports the counter ring 20.
  • the base housing 18a is permanently attached to the connecting housing 14 and/or pump housing 4 and, in the exemplary embodiment, has an externally circumferential collar 24 which is fixed between the pump housing 4 and the connecting housing 14.
  • the housing cover 18b is detachably attached to the base housing 18a, e.g., by means of screws or other fasteners, so that the housing cover 18b, together with the counter ring 20 attached to it, can be separated from the base housing 18a.
  • the base housing 18a is essentially hollow cylindrical.
  • the housing cover 18b is annular and therefore has a central opening through which the connecting shaft 9 can pass.
  • Fig. 2 Figure 1 shows the eccentric screw pump in its assembled state, but with the rotor already separated.
  • the mechanical seal 13 must be removed from the connecting housing or pump housing.
  • the seal housing 18 according to the invention is first disassembled as follows: Fig.
  • the housing cover 18b is removed from the base housing 18a, thereby also separating the counter ring 20 from the sliding ring 19, since the counter ring 20 is rotationally fixed to the housing cover 18b, e.g., pressed into the housing cover 18b with an interposed sealing ring 25. Subsequently, it is possible to remove the housing cover 18b.
  • Fig. 4 As shown, the connecting shaft 9 is pulled axially away from the output shaft 8 and out of the connecting housing 14 (after, of course, the connection between connecting shaft 9 and output shaft 8 has been loosened). In doing so, Fig. 4 It is evident that the connecting shaft 9 also removes the part of the mechanical seal 13, including the sliding ring 19, which is fixed to the connecting shaft 9 against rotation. Interestingly, the connecting shaft 9, with the sliding ring 19 attached to it, can be removed from the connecting housing 14 without having to dismantle the pump housing 4 beforehand. Even the suction line 26, connected to the opening 6, does not need to be removed.
  • FIG. 4 The illustration shows that not only is the connecting shaft 9 removed in the axial direction, but also the rotating unit, or the part of the rotating unit without the rotor, which includes at least the connecting shaft 9 and, in the exemplary embodiment, additionally the coupling rod 10 with the mounted joints 11, 12.
  • This rotating unit can be pulled out of the pump housing 4 in the axial direction via the front opening 7, so that the part of the mechanical seal attached to the connecting shaft 9, including the sliding ring 19, is then freely available for maintenance purposes.
  • This is particularly easy in the illustrated embodiment because the stator 1 can be easily disassembled beforehand, as it is a longitudinally split stator.
  • the rotating unit can be easily pulled out in the manner described, without requiring further disassembly of the pump or the components connected to it.
  • the invention provides access for replacing the mechanical seal via the front opening 7 of the pump housing 4. This requires that sufficient space is provided for removing the rotating unit. In the exemplary embodiment, this is achieved via the longitudinally split stator.
  • the invention also includes embodiments in which the stator can be removed in a different way. If necessary, the pressure-side piping system must first be disassembled. In any case, disassembly of the pump housing and the suction-side lines is not required.
  • the output end 8a of the output shaft 8 is spaced from the base housing 18a of the mechanical seal such that the housing cover 18b can be removed from the connecting housing when the connecting shaft is disassembled between the output end 8a and the base housing 18a.
  • the housing cover 18b including the counter ring 20 attached to it, having an axial length L that is less than the axial distance A between the output end 8a and the (assembled) base housing 18a.
  • the inventive design of the split sealing housing 18 offers advantages not only during the described disassembly but also during the subsequent assembly. This is because it is now possible to first insert the connecting shaft 9 or the entire rotating unit into the pump housing 4, thereby passing the connecting shaft 9 through the base housing 18a, without the risk of damage to the component in the housing cover.
  • the counter ring 20 is damaged. This is because the connecting shaft 9 is inserted through this housing cover 18b or the counter ring 20 and placed onto or inserted into the output shaft 8 before the housing cover 18b is attached to the base housing 18a. This means that the housing cover 18b is freely movable within the connecting housing 14 and is only attached to the base housing 18a after the connecting shaft 9 has been inserted.
  • assembly and disassembly are particularly easy to carry out with an additional assembly tool 27, which is located in Fig. 5
  • This assembly tool has, on the one hand, a receptacle 28 for the rotating unit and, on the other hand, a handle 29 attached to the receptacle 28.
  • the receptacle 28 can be plate-shaped or shell-shaped and is dimensioned such that it accommodates the rotating unit (here, the connecting rod and the connecting shaft) substantially or almost over its entire length, so that the rotating unit, despite its "unstable construction" (e.g., with the joints), can be inserted smoothly from the rotor-side end face into the pump housing 4, up to the area of the output shaft 8 of the drive 3.
  • the length of the receptacle 28 of the assembly tool 27 is at least long enough to accommodate the connecting rod, including the two joints, thus supporting the joints and ensuring a stable arrangement.
  • the length of the receptacle of the assembly tool therefore preferably corresponds at least to the length of the rotor head 17, joint 12, connecting rod 10, and joint 11.
  • the receptacle 28 is designed in a shell-like shape, so that it secures the rotating unit against falling.
  • This shell-like design can, for example, be arcuate in cross-section, preferably circular, so that it has the shape of a (hollow) cylindrical segment.
  • the flange 30 of the receiving tool to which the handle 29 and the receiver 28 are connected on one side, has a suitable receptacle or recess, e.g., a groove 31, which in the exemplary embodiment is U-shaped.
  • the rotating unit namely the rotor head 17, can be inserted (positively) into this receptacle or recess 31, so that the rotating unit is securely held.
  • This receptacle/recess 31 is not only semicircular but preferably U-shaped, so that even higher-profile joint designs (e.g., with boot protection) can be practically accommodated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Claims (11)

  1. Pompe à vis sans fin excentrique avec au moins
    - un stator (1)
    - un rotor (2) tournant dans le stator,
    - un entraînement (3) pour le rotor,
    - un corps de pompe (4) raccordé au stator (1), lequel comporte au moins une ouverture d'entrée ou de sortie (6) pour le milieu à transporter,
    - un boîtier de liaison (14) ouvert ou à ouvrir, disposé entre le corps de pompe (4) et l'entraînement (3)
    - un arbre de liaison (9) raccordé de façon séparable à l'entraînement (3), qui est disposé au moins en partie dans le boîtier de liaison (14),
    sachant que l'arbre de liaison (9) est étanchéifié avec une garniture mécanique d'étanchéité (13) pour la séparation étanche au liquide du corps de pompe (4) vis-à-vis de l'environnement ou vis-à-vis du boîtier de liaison (14),
    sachant que la garniture mécanique d'étanchéité (13) comporte un boîtier d'étanchéité (18) fixé au corps de pompe (4) et/ou au boîtier de liaison (14), une bague coulissante (19) fixée solidaire en rotation sur l'arbre de liaison (9) et tournant dans le boîtier d'étanchéité (18) et une contre-bague (20) fixe, fixée au boîtier d'étanchéité (18), sachant que le boîtier d'étanchéité (18) est constitué en tant que boîtier d'étanchéité divisé et comporte d'une part, un boîtier de base (18a) entourant à l'état monté la bague coulissante (19) et fixé au corps de pompe (4) et/ou au boîtier de liaison (14) et d'autre part, un couvercle de boîtier (18b) portant la contre-bague (20), caractérisée en ce que le couvercle de boîtier (18b) est fixé de façon séparable au boîtier de base (18a) et peut être séparé de celui-ci de telle manière que l'arbre de liaison (9) peut être extrait du boîtier d'étanchéité (18) avec la bague coulissante (19) fixée à celui-ci.
  2. Pompe à vis sans fin excentrique selon la revendication 1, caractérisée en ce que la garniture mécanique d'étanchéité (13) est constituée en tant que garniture mécanique d'étanchéité simple.
  3. Pompe à vis sans fin excentrique selon la revendication 1 ou 2, caractérisée en ce que le boîtier de base (18a) est constitué de forme cylindrique creuse et/ou en ce que le couvercle de boîtier (18b) est constitué de forme cylindrique creuse ou annulaire avec un passage central pour l'arbre de liaison (9).
  4. Pompe à vis sans fin excentrique selon l'une quelconque des revendications 1 à 3, sachant que l'entraînement (3) comporte un arbre de sortie (8) aux extrémités de sortie côté pompe (8a) duquel, l'arbre de liaison (9) est fixé de façon séparable avec son extrémité d'arbre côté entraînement, caractérisée ce que l'extrémité de sortie (8a) est éloignée du boîtier de base (18a) de la garniture mécanique d'étanchéité (13) de telle sorte que le couvercle de boîtier (18b) peut être enlevé du boîtier de liaison (14) à l'état démonté de l'arbre de liaison (9) entre l'extrémité de sortie (8a) et le boîtier de base (18a).
  5. Pompe à vis sans fin excentrique selon la revendication 4, caractérisée en ce que le couvercle de boîtier (18b) y compris de préférence la contre-bague (20) fixée à celui-ci, comporte une longueur (L) en direction axiale, qui est plus faible que la distance axiale (A) entre l'extrémité de sortie (8a) et le boîtier de base (18a).
  6. Pompe à vis sans fin excentrique selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le stator (1) est composé de plusieurs segments de stator en tant que stator divisé longitudinalement et/ou en ce que le stator (1) est entouré d'une enveloppe de stator (15) qui est composée de préférence de plusieurs segments d'enveloppe (16) en tant qu'enveloppe divisée longitudinalement, qui forment de préférence un dispositif de serrage de stator.
  7. Procédé de maintenance et/ou d'échange d'une garniture mécanique d'étanchéité (13) d'une pompe à vis sans fin excentrique, selon l'une quelconque des revendications 1 à 6, sachant que la pompe à vis sans fin excentrique comporte au moins
    - un stator (1),
    - un rotor (2) tournant dans le stator,
    - un entraînement (3) pour le rotor,
    - un corps de pompe (4) raccordé au stator (1), lequel comporte au moins une ouverture d'entrée ou de sortie (6) pour le milieu à transporter,
    - un boîtier de liaison (14) ouvert ou à ouvrir, disposé entre le corps de pompe (4) et l'entraînement (3),
    - un arbre de liaison (9) raccordé de façon séparable à l'entraînement (3), qui est disposé au moins en partie dans le boîtier de liaison (14),
    sachant que l'arbre de liaison (9) est étanchéifié avec une garniture mécanique d'étanchéité (13) pour la séparation étanche au liquide du corps de pompe (4) vis-à-vis de l'environnement ou vis-à-vis du boîtier de liaison (14),
    sachant que la garniture mécanique d'étanchéité (13) comporte un boîtier d'étanchéité (18) fixé au corps de pompe (4) et/ou au boîtier de liaison (14), une bague coulissante (19) fixée solidaire en rotation sur l'arbre de liaison (9) et tournant dans le boîtier d'étanchéité (18) et une contre-bague (20) fixe, fixée au boîtier d'étanchéité (18),
    caractérisé en ce que le boîtier d'étanchéité (18) est constitué en tant que boitier d'étanchéité divisé et comporte d'une part un boîtier de base (18a) entourant à l'état monté la bague coulissante (19) et fixé au corps de pompe (4) et/ou au boîtier de liaison (14) et d'autre part un couvercle de boîtier (18b) portant la contre-bague (20), qui est fixée de façon séparable au boîtier de base (18a) et pouvant être séparé de celui-ci,
    et en ce que pour le démontage, le couvercle de boîtier (18b) est d'abord séparé du boîtier de base (18a) en passant à travers le boîtier de liaison (14) à ouverture ou ouvert et ensuite au moins l'arbre de liaison (9) avec la bague coulissante (19) disposée sur l'arbre de liaison (9) est enlevé du boîtier de liaison (14) en direction axiale et de préférence à travers le corps de pompe (4).
  8. Procédé selon la revendication 7, caractérisé en ce qu'une unité rotative de la pompe à vis sans fin excentrique, composée d'au moins une barre d'accouplement (10) et d'un arbre de liaison (9), est enlevée entièrement dans la direction axiale à travers le corps de pompe (4), par ex. à travers une ouverture de carter (7) tournée vers le stator.
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que le stator (1) est d'abord démonté et l'unité rotative est ensuite enlevée du corps de pompe (4) à travers une ouverture de carter (7) tournée vers le stator (1).
  10. Procédé selon l'une quelconque des revendications 7 à 9, caractérisé en ce qu'au cours du montage, l'arbre de liaison (9) ou l'unité rotative sont d'abord introduits dans le corps de pompe (4) et l'arbre de liaison (9) est à cet effet passé à travers le boîtier de base (18a) et le couvercle de boîtier (18b) séparé de celui-ci et est par ex. monté sur l'arbre de sortie ou enfilé dans celui-ci et en ce que le couvercle de boîtier (18b) est ensuite fixé au boîtier de base (18a).
  11. Procédé selon l'une quelconque des revendications 7 à 10, caractérisé en ce que l'unité rotative peut être enlevée du corps de pompe pendant le démontage avec un outil de montage (27) et/ou peut être introduite dans le corps de pompe (4) pendant le montage, sachant que l'outil de montage comporte au moins un logement (28) pour l'unité rotative et une poignée (29) fixée à celui-ci.
EP19700342.9A 2018-02-06 2019-01-07 Pompe à vis sans fin excentrique Active EP3749861B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018102640.4A DE102018102640A1 (de) 2018-02-06 2018-02-06 Exzenterschneckenpumpe
PCT/EP2019/050258 WO2019154571A1 (fr) 2018-02-06 2019-01-07 Pompe à cavité progressive

Publications (3)

Publication Number Publication Date
EP3749861A1 EP3749861A1 (fr) 2020-12-16
EP3749861B1 EP3749861B1 (fr) 2022-02-23
EP3749861B2 true EP3749861B2 (fr) 2026-01-14

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EP (1) EP3749861B2 (fr)
DE (1) DE102018102640A1 (fr)
WO (1) WO2019154571A1 (fr)

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DE102019130981A1 (de) * 2019-11-15 2021-05-20 Seepex Gmbh Exzenterschneckenpumpe
US12129848B2 (en) 2021-05-12 2024-10-29 Johnson & Johnson Surgical Vision, Inc. Disposable pump cartridge
DE102021128157A1 (de) 2021-10-28 2023-05-04 Seepex Gmbh Exzenterschneckenpumpe
US12473915B2 (en) * 2022-10-31 2025-11-18 Johnson & Johnson Surgical Vision, Inc. Apparatus and method for mechanically coupling a motor to a rotor of a progressive cavity pump
US12152588B1 (en) 2023-05-26 2024-11-26 Grant Prideco, Inc. Free-mold stator for a progressing cavity pump
US20250369442A1 (en) * 2024-05-31 2025-12-04 National Oilwell Varco, L.P. Seal assembly for progressive cavity pump

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EP3473856A1 (fr) † 2017-10-20 2019-04-24 Circor Pumps North America, Llc. Dispositif de démontage pour pompes à cavité progressive

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DE102005039618A1 (de) * 2004-08-20 2006-03-02 Knoll Maschinenbau Gmbh Wellenschnittstelle
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DE102009037993B4 (de) * 2009-08-20 2014-07-03 bdtronic GmbH Exzenterschneckenpumpe
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EP3473856A1 (fr) † 2017-10-20 2019-04-24 Circor Pumps North America, Llc. Dispositif de démontage pour pompes à cavité progressive

Also Published As

Publication number Publication date
DE102018102640A1 (de) 2019-08-08
EP3749861A1 (fr) 2020-12-16
EP3749861B1 (fr) 2022-02-23
WO2019154571A1 (fr) 2019-08-15

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