EP3096014B1 - Eccentric screw pump - Google Patents

Eccentric screw pump Download PDF

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Publication number
EP3096014B1
EP3096014B1 EP16160296.6A EP16160296A EP3096014B1 EP 3096014 B1 EP3096014 B1 EP 3096014B1 EP 16160296 A EP16160296 A EP 16160296A EP 3096014 B1 EP3096014 B1 EP 3096014B1
Authority
EP
European Patent Office
Prior art keywords
stator
spacer ring
eccentric screw
screw pump
connection
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
EP16160296.6A
Other languages
German (de)
French (fr)
Other versions
EP3096014A1 (en
Inventor
Florian Biegger
Wolfgang Vollmer
Thomas Coenen
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.)
Pumpenfabrik Wangen GmbH
Original Assignee
Pumpenfabrik Wangen 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
Application filed by Pumpenfabrik Wangen GmbH filed Critical Pumpenfabrik Wangen GmbH
Publication of EP3096014A1 publication Critical patent/EP3096014A1/en
Application granted granted Critical
Publication of EP3096014B1 publication Critical patent/EP3096014B1/en
Active 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
    • 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
    • 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
    • F04C2/1073—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 where one member is stationary while the other member rotates and orbits
    • F04C2/1075—Construction of the stationary member
    • 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
    • F04C2230/603—Centering; Aligning

Definitions

  • the invention relates to an eccentric screw pump according to the preamble of claim 1.
  • An eccentric screw pump of the type mentioned is for example from DE 10 2008 021 919 A1 known.
  • the known progressing cavity pump comprises a stator and a rotor which is rotatably arranged inside the stator.
  • a spacer ring is also provided, which connects to a longitudinal end of the stator on the connection side.
  • the spacer ring essentially forms a pipe section which is arranged in a longitudinally axially clamping manner between the stator and a connecting flange of a connecting piece. The spacer ring can be removed radially from the progressing cavity pump, so that it is possible to remove the stator from the progressing cavity pump by means of a pivoting movement.
  • the previously known solution for a simplified removal of a stator from an eccentric screw pump has several disadvantages.
  • the clamping fixation of the spacer ring requires a high degree of manufacturing tolerances and a particularly high level of accuracy when inserting the spacer ring to ensure adequate tightness of the eccentric screw pump.
  • the spacer ring is fixed by the pretension which is applied by means of threaded rods between a flange of the stator on the pump side and the connecting flange.
  • the spacer ring In order to ensure that the progressing cavity pump is adequately sealed, it is therefore necessary for the spacer ring to be clamped on all sides with an even pretensioning force. There is therefore a risk that the Spacer ring canted due to inaccurate or improper assembly and thus the tightness requirements are not met.
  • the previously known eccentric screw pump requires additional seals between the spacer ring and the stator, the spacer ring and the connecting flange of the connecting piece, and the connecting flange and the continuing pipe on the connecting piece.
  • the spacer ring when assembling the spacer ring, it must also be ensured that it is exactly centered in relation to the stator in order to achieve sufficient tightness, which is particularly critical at higher operating pressures of more than 6 bar.
  • the object of the invention is to further develop an eccentric screw pump of the type mentioned at the outset in such a way that the assembly of the eccentric screw pump is simplified, in particular optimized in terms of time, while at the same time good sealing of the eccentric screw pump is ensured. According to the invention, this object is achieved with regard to the eccentric screw pump by the subject matter of claim 1.
  • the invention proposes an eccentric screw pump with a stator and a rotor, the rotor being arranged rotatably within the stator.
  • a radially removable spacer ring is arranged on a connection-side end of the stator.
  • the spacer ring has a centering means.
  • the invention thus differs from the previously known eccentric screw pump DE 10 2008 021 919 A1 in that, according to the invention, a centering means is provided on the sealing spacer ring.
  • the centering means enables the spacer ring to be installed in the exact position and thus ensures the required tightness of the progressing cavity pump.
  • the assembly process is thus simplified since the exact positioning of the spacer ring is already specified by the centering means and is not set by hand got to.
  • the superior position of the spacer ring is maintained, which is to reduce the assembly times on the eccentric screw pump by removing the spacer ring radially and thus separating the stator from the pump drive by a pivoting movement.
  • the centering means can be formed in one piece with a flange of the spacer ring on the stator side.
  • the spacer ring has a flange at its longitudinal end facing the stator, which flange encompasses the centering means or forms the centering means.
  • the flange can be adapted to accommodate tensioning means that enable longitudinal axial tensioning of the spacer ring with the stator.
  • Such clamping means can be formed, for example, by threaded rods.
  • the flange of the spacer ring on the stator side thus achieves improved fixing of the spacer ring within the eccentric screw pump, in particular with respect to the stator, so that good tightness of the eccentric screw pump can be ensured.
  • the centering means is preferably designed in the form of an arc, in particular in the form of a semi-ring.
  • the centering means can follow the outer contour of the stator.
  • the centering means enables the spacer ring to be positioned in a form-fitting manner. Such a design of a centering means is particularly easy to produce.
  • the centering means has an inner surface, in particular arcuate or polygonal, which rests against an outer peripheral surface of the stator when the spacer ring is in the mounted state.
  • the inner surface of the centering means is designed to be complementary to the outer peripheral surface of the stator. A particularly simple and efficient centering of the spacer ring is thus possible.
  • the centering means or its inner surface forms at most a half ring in order to ensure that the Spacer ring is radially removable. It has also been found to be advantageous that the inner surface, which forms a contact surface of the centering means with respect to the stator, is arranged outside the wet sealing surfaces of the eccentric screw pump.
  • the stator is preferably supported by a pump foot.
  • the pump foot can comprise an arcuate or polygonal bearing surface which, when the pump foot is in the mounted state, bears against an outer peripheral surface of the stator.
  • the bearing surface of the pump foot can in particular be designed in the shape of a semi-ring.
  • the support surface of the pump foot is designed to be complementary to the outer peripheral surface of the stator.
  • the pump foot can be connected directly below the centering means of the spacer ring, so that a space-saving and simple arrangement of the pump foot is achieved.
  • the bearing surface of the pump foot forms a substantially closed annular surface with the inner surface of the centering means when the centering means and the pump foot are in the assembled state.
  • the contact surface of the pump foot has a width that corresponds to the width of the centering means, so that the pump foot forms a common end face with the centering means.
  • the stator-side flange and/or the pump base has through-holes for receiving threaded rods.
  • the threaded rods can be aligned or can be aligned parallel to the longitudinal axis of the stator.
  • the threaded rods preferably form prestressing means which apply a longitudinally axial prestressing force between the flange of the spacer ring on the stator side and the stator.
  • the stator can also have a drive-side flange at its drive-side longitudinal end, which has through-holes for receiving the prestressing means, in particular the threaded rods.
  • the longitudinal axial prestressing force which contributes to the tightness of the eccentric screw pump, is applied directly between the spacer ring and the stator.
  • the through bores in the stator-side flange of the spacer ring are preferably arranged radially outside of a stator-side sealing surface of the spacer ring.
  • at least some of the through-holes can pass through the centering means. In this embodiment according to the invention, a separation is thus achieved between the fixing or fastening area and the sealing area on the spacer ring.
  • the fastening area to which the tensioning force is transmitted to the spacer ring by the pretensioning means, is arranged outside the sealing area.
  • the fastening area is in a dry area of the progressing cavity pump. This ensures that the fixing of the spacer ring within the progressing cavity pump does not disturb the sealing line of the liquid-carrying spaces. This reduces the operating risk of the progressing cavity pump.
  • the spacer ring can also have a flange on the connection side, which has connection bores for receiving a connecting element for connecting the spacer ring to a connection pipe.
  • the spacer ring can thus be connected to a connection pipe in a well-sealed manner and in this respect enables the progressing cavity pump to be connected to further pipelines.
  • the stator has a cladding tube and an elastomer core.
  • the elastomer core can protrude longitudinally and axially beyond the enveloping tube and form a seal between the stator and the spacer ring.
  • the spacer ring can have a handle.
  • the handle can be arranged parallel to the longitudinal axis of the spacer ring.
  • a particularly simple design of the handle results when it connects the connection-side flange and the stator-side flange to one another.
  • a recessed grip is provided below the handle between the flange on the connection side and the flange on the stator side, which recess enables the spacer ring to be handled particularly easily.
  • the handle is preferably arranged in the area of the centering means of the spacer ring. It is particularly preferred if the handle is arranged radially opposite to the pump base.
  • the spacer ring is connected to the pump base in such a way that the centering means can be radially prestressed against the stator.
  • the pump base and the spacer ring can be braced radially against one another, so that the inner surfaces of the pump base and the centering means are pressed against the outer peripheral surface of the stator. This improves the fixation between the spacer ring and the stator, ensures exact positioning and supports the sealing effect between the spacer ring and the stator.
  • the spacer ring has a sealing ring on the connection side, which protrudes longitudinally axially over the connection-side flange for bearing against a complementary sealing surface of a connecting pipe.
  • the sealing ring can be an integral part of the spacer ring or form a separate element that can be connected to the spacer ring at least in a non-positive manner. The sealing ring ensures the seal between the spacer ring and a connecting pipe that can be connected to it.
  • an eccentric screw pump is shown in each case, which has a pump drive 1 , a suction housing 2 and a delivery section 5 .
  • the conveyor section 5 comprises a stator 10 in which a rotor 11 is rotatably arranged.
  • the progressing cavity pump is preferably arranged between a connecting pipe 3 and an inflow pipe 4 or is in fluid communication with the inflow pipe 4 and the connecting pipe 3 .
  • connection pipe 3 Liquid or viscous media are fed to the progressing cavity pump via the connection pipe 3 and are ejected via the connection pipe 3 by the pumping capacity of the progressing cavity pump.
  • the conveying direction of the eccentric screw pump is therefore from the inflow pipe 4 to the connection pipe 3.
  • the connection pipe 3 is connected to the suction housing 2 in a fluid-tight manner.
  • the suction housing 2 is also connected to the pump drive 1 on the one hand and the delivery section 5 or the stator 10 on the other hand.
  • the medium supplied from the connecting pipe 3 first enters the suction housing 2 and is conveyed to the connecting pipe 3 via the conveying movement that takes place in the conveying section 5 .
  • a spacer ring 20 is arranged between the connecting pipe 3 and the stator 10 .
  • the spacer ring 20 can be removed radially.
  • the spacer ring 20 is designed in such a way that it can be removed in the radial direction relative to a longitudinal axis of the eccentric screw pump without having to remove other liquid-carrying components of the eccentric screw pump or the piping system connected to it.
  • the spacer ring 20 includes a centering means 21.
  • the centering means 21 enables the spacer ring 20 to be arranged with precise positioning in relation to the stator 10.
  • the spacer ring 20 is designed in particular as a tube section.
  • a flange 22 , 23 is arranged on each of the longitudinal axial ends of the spacer ring 20 .
  • the centering means 21 is arranged on a flange 22 on the stator side, so that the centering means 21 interacts with the stator 10 in the assembled state.
  • the flange 22 on the stator side is preferably designed in one piece with the centering means 21, a multi-part design also being conceivable.
  • the centering means 21 can be screw-connected to the flange 22 on the stator side.
  • the centering means 21 is designed in the form of an arc, specifically in the form of a half ring.
  • the centering means 21 has an inner surface 24 which is curved in the shape of an arc, preferably in the shape of a semicircle.
  • the outer surface of the centering means 21 can have a different shape.
  • the inner surface 24 of the centering means 21 is adapted to the curvature of the outer peripheral surface of the stator 10 .
  • the inner surface 24 of the centering means 21 preferably lies flush with the surface or with full-surface contact on the outer peripheral surface 18 of the stator 10 .
  • the centering means 21 essentially forms a thickening or material reinforcement of the stator-side flange 22 that extends in the longitudinal direction of the spacer ring 20.
  • the inner surface 24 of the centering means 21 has a polygonal configuration. At least the end 13 of the stator 10 on the connection side is preferably designed to complement it, so that the centering means 21 can be placed with an exact fit on the end 13 of the stator 10 on the connection side.
  • the polygonal shape of the inner surface 24 can in particular form half a regular hexagon or half a regular octagon. This applies in particular when viewed in the direction parallel to the longitudinal axis of the spacer ring 20.
  • connection-side end 13 of the stator 10 can have a hexagonal or octagonal cross-sectional geometry.
  • Other, regularly polygonal or polygonal shapes are possible, with the centering means 21 preferably having a corresponding, complementary shape, which is formed by dividing the shape of the connection-side end 13 of the stator 10 in half.
  • the matching shapes of the centering means 21 and the stator-side end 13 of the stator 10 result in centering, by which the radial position of the spacer ring 20 with respect to the stator can be fixed.
  • the inner surface 24 of the centering means 21 is essentially perpendicular to a stator-side sealing surface 25 of the spacer ring 20.
  • the stator-side sealing surface 25 is essentially ring-shaped and is in the installed state of the spacer ring 20 in sealing contact with the stator 10.
  • the stator 10 has an enveloping tube 16 which surrounds an elastomer core 17 .
  • the elastomer core 17 can protrude longitudinally axially in the direction of the spacer ring 20 over the cladding tube 16 so that the elastomer core 17 forms a seal against the stator-side sealing surface 25 of the spacer ring 20 .
  • a separate sealing element is arranged between the stator-side sealing surface 25 and the stator 10 .
  • the flange 22 on the stator side protrudes at least partially radially beyond the outer peripheral surface 18 of the stator 10 .
  • This section of the stator-side flange 22 protruding beyond the outer peripheral surface 18 forms a fastening area 26 .
  • the stator-side flange 22 in particular the fastening area 26 , can comprise a straight peripheral section 28 .
  • the straight peripheral section 28 is preferably arranged radially opposite the centering means 21 ( FIG. 6 ).
  • the fastening area 26 includes through-holes 27 which are used to hold threaded rods 14 .
  • the spacer ring 20 can be prestressed against the stator 10 in the longitudinal direction.
  • the arrangement of the threaded rods 14 is good in the FIG. 1 and 5 recognizable.
  • the stator 10 also has a flange or flange at its drive-side end 12 radially outwardly protruding fastening area, which includes through bores for receiving the threaded rods 14 .
  • the threaded rods 14, four threaded rods 14 preferably being provided in the present exemplary embodiment, extend through the through bores 27 of the drive-side end 12 of the stator 10 and the stator-side flange 22 of the spacer ring 20 and are fixed with nuts 15.
  • the nuts 15 are also used for prestressing, which serves to connect the spacer ring 22 to the stator 10 in a force-fitting manner in the longitudinal direction.
  • a tubular section 37 of the spacer ring 20 adjoins the flange 22 of the spacer ring 20 on the stator side.
  • the pipe section 37 has an outer circumference that is smaller than the outer circumference of the stator-side flange 22 .
  • a connection-side flange 23 is formed on the spacer ring 20 longitudinally and axially opposite the stator-side flange 22 , the outside diameter of which is also larger than the outside diameter of the pipe section 37 .
  • the flange 23 on the connection side comprises a plurality of connection bores 34 which enable the spacer ring 20 to be connected to the connection pipe 23 .
  • connecting elements 36 are provided in the form of screws which, in the mounted state of the spacer ring 20, extend through a connecting flange 6 of the connecting pipe 3 and the connecting bores 34 of the connecting-side flange 23 and are fixed by means of nuts. To this extent, the connecting elements 36 apply a prestressing force between the spacer ring 20 and the connection pipe 3 in order to ensure a liquid-tight connection between the spacer ring 20 and the connection pipe 3 .
  • connection-side flange 23 of the spacer ring 20 is clearly visible. It can also be seen that a sealing ring 33 is formed on the connection-side flange 23 of the spacer ring 20 , which protrudes longitudinally axially over an annular surface of the connection-side flange 23 .
  • the projecting design of the sealing ring 33 enables a particularly simple surface treatment of the sealing surface 32 on the connection side, which is formed on the sealing ring 33 .
  • the sealing surface 32 on the connection side can be designed with a particularly high surface quality, so that the tightness of the connection between the spacer ring 20 and the connection pipe 3 is improved.
  • the sealing surface 32 on the connection side lies flush and in particular in a liquid-tight manner on a connection sealing surface 7 of the connection pipe 3 .
  • an additional sealing element to be provided between the connection-side sealing surface 32 on the sealing ring 33 and the connection sealing surface 7 on the connecting pipe 3 .
  • the spacer ring 20 also has a handle 31 .
  • the handle 31 extends from the stator-side flange 22 to the connection-side flange 23.
  • the handle 31 is preferably aligned parallel to a longitudinal axis of the spacer ring 20 or parallel to the liquid conveying direction.
  • a recessed grip 38 is formed below the handle 31, which is delimited on the one hand by the handle 31, on the other hand by the pipe section 37 and also by the flange 22 on the stator side and the flange 23 on the connection side.
  • the handle 31 is preferably centered with respect to the centering means 21 .
  • the handle 31 is arranged on the spacer ring 20 in such a way that the handle 31 protrudes vertically upwards when the spacer ring 20 is in the mounted state.
  • the handle 31 is in particular arranged radially opposite a pump foot 40 when the spacer ring 20 is mounted in the eccentric screw pump.
  • the pump base 40 has, at least in sections, an L-profile, which can be seen particularly in the side view according to FIG. 2 indicates.
  • the pump base 40 can be designed as a sheet metal part that is bent over to form a support bracket 43 .
  • the support bracket 43 essentially forms a bearing surface for supporting the pump foot 40 on a floor level.
  • the pump foot has a leg 44 on the bottom side and a leg 45 on the stator side, the leg 45 on the stator side being in the Substantially perpendicular to the bottom leg 44 is arranged.
  • the leg on the bottom can essentially be formed by two support brackets 43 arranged at a distance from one another.
  • a recess 46 is provided between the support bracket 43 ( FIG. 4 ).
  • FIG. 4 shows the arrangement of the pump foot 40 with respect to the spacer ring 20 in the assembled state of the eccentric screw pump.
  • the pump foot 40 specifically its leg 44 on the bottom, comprises a bearing surface 41 which is curved essentially in the shape of an arc or a semicircle.
  • the curvature of the bearing surface 41 is adapted to the curvature of the outer peripheral surface 18 of the stator 10 .
  • the annular surface 35 can be essentially closed, it being provided that both the bearing surface 41 and the inner surface 24 each form a half ring of the annular surface 35 .
  • the inner surface 24 and the bearing surface 41 are perpendicular to the stator-side sealing surface 25 of the spacer ring 20 and in this respect delimit a sealing surface area of the spacer ring 20 on the stator side.
  • the pump foot 40 also includes end surfaces 42 which are in full-surface contact with the end surfaces 29 of the centering means 21 .
  • the centering means 21 rests with its end faces 29 on the end faces 42 of the pump foot 40 .
  • the pump base 40 in particular in the stator-side leg 45, there are through-holes 27 which are aligned with the through-holes 27 of the stator-side flange 22 of the spacer ring 20 and to this extent also receive the threaded rods 14.
  • the bearing surface 41 of the pump foot 40 in particular analogous to the inner surface 24 of the centering means 21, can be polygonal, in particular regularly half polygonal.
  • the bearing surface 41 forms a half hexagonal shape or half an octagonal shape.
  • connection-side end 13 of the stator 10 and the combination of the inner surface 24 of the centering means 10 and the bearing surface 41 of the pump foot 40 each form an octagon.
  • the pump base 40 in particular its stator-side limb 45, has a thickness or width which essentially corresponds to the width of the centering means 21.
  • the centering means 21 forms a common, preferably level, end face 30 with the pump base 40, in particular the stator-side leg 45.
  • the design of the spacer ring 20 enables a particularly simple removal and in particular replacement of the stator 10, which is usually subject to a high level of wear. This applies in particular to the elastomer core 17 of the stator 10. As in FIG. 5 is clearly visible, to remove the stator 10, the fixing of the spacer ring 20 is first released. For this purpose, on the one hand, the connecting elements 26 or screws on the connection-side flange 23 of the spacer ring 20 are loosened and removed.
  • the nuts 15 of the threaded rods 14 are then loosened at the end 13 of the stator 10 on the connection side.
  • the threaded rods 14 can then be pushed in the direction of the pump drive 1 so that the through bores 27 on the spacer ring 20 are exposed.
  • the spacer ring 20 can then be removed or lifted out in the radial direction, in particular vertically upwards, preferably with the aid of the handle 31 .
  • connection pipe 3 This creates the necessary free space between the connection pipe 3 and the stator 10 in order to detach the stator 10 from the suction housing 2 by means of a pivoting movement, during which the end 13 of the stator 10 on the connection side in particular is lifted.
  • the stator 10 can initially slightly in the direction of the connecting pipe 3 are shifted longitudinally axially relative to the longitudinal axis of the eccentric screw pump and then removed laterally.
  • a new stator 10 is assembled in reverse order.
  • the stator 10 is first inserted laterally between the connection pipe 3 and the suction housing 2 and positioned coaxially by means of the pump foot 40 .
  • the stator 10 is then connected to the suction housing 2 in the direction of the longitudinal axis of the eccentric screw pump.
  • the spacer ring 20 is then inserted radially between the connection pipe 3 and the stator 10 .
  • the spacer ring 20 is then screwed to the threaded rods 14 so that a prestressing force is applied between the spacer ring 20 and the stator 10 .
  • the spacer ring 20 can be connected to the connecting pipe 3 by means of the connecting elements 36 and can be prestressed to form a seal.
  • the invention enables the stator 10 to be expanded radially without disturbing the sealing lines of the eccentric screw pump or having to provide additional seals.
  • the possibility of being able to remove the spacer ring 20 radially also ensures that the entire eccentric screw pump can remain at its installation site when changing the most important wear parts, in particular the stator 10 .
  • the invention forms a quick-change device that significantly reduces the maintenance effort of an eccentric screw pump.
  • a further optimization of the time required for the maintenance of the eccentric screw pump is achieved by simply centering the spacer ring 20 by means of the centering means 21, which also ensures good and reliable sealing of the liquid-carrying areas.

Description

Die Erfindung betrifft eine Exzenterschneckenpumpe gemäß dem Oberbegriff des Patentanspruchs 1. Eine Exzenterschneckenpumpe der eingangs genannten Art ist beispielsweise aus der DE 10 2008 021 919 A1 bekannt.The invention relates to an eccentric screw pump according to the preamble of claim 1. An eccentric screw pump of the type mentioned is for example from DE 10 2008 021 919 A1 known.

Die bekannte Exzenterschneckenpumpe umfasst einen Stator und einen Rotor, der innerhalb des Stators drehbar angeordnet ist. Um die Wartung der Pumpe zu erleichtern, ist ferner ein Distanzring vorgesehen, der sich an einem anschlussseitigen Längsende des Stators anschließt. Der Distanzring bildet im Wesentlichen einen Rohrabschnitt, der längsaxial klemmend zwischen dem Stator und einem Anschlussflansch eines Anschlussstutzens angeordnet ist. Der Distanzring kann radial aus der Exzenterschneckenpumpe entnommen werden, so dass es möglich ist, den Stator mittels einer Schwenkbewegung aus der Exzenterschneckenpumpe auszubauen.The known progressing cavity pump comprises a stator and a rotor which is rotatably arranged inside the stator. In order to facilitate maintenance of the pump, a spacer ring is also provided, which connects to a longitudinal end of the stator on the connection side. The spacer ring essentially forms a pipe section which is arranged in a longitudinally axially clamping manner between the stator and a connecting flange of a connecting piece. The spacer ring can be removed radially from the progressing cavity pump, so that it is possible to remove the stator from the progressing cavity pump by means of a pivoting movement.

Die vorbekannte Lösung für einen vereinfachten Ausbau eines Stators aus einer Exzenterschneckenpumpe hat jedoch mehrere Nachteile. Insbesondere die klemmende Fixierung des Distanzrings erfordert ein hohes Maß an Fertigungstoleranzen und eine besonders hohe Genauigkeit beim Einsetzen des Distanzrings, um eine ausreichende Dichtigkeit der Exzenterschneckenpumpe sicherzustellen.However, the previously known solution for a simplified removal of a stator from an eccentric screw pump has several disadvantages. In particular, the clamping fixation of the spacer ring requires a high degree of manufacturing tolerances and a particularly high level of accuracy when inserting the spacer ring to ensure adequate tightness of the eccentric screw pump.

Die Fixierung des Distanzrings erfolgt bei der bekannten Exzenterschneckenpumpe durch die Vorspannung, die mittels Gewindestangen zwischen einem pumpenseitigen Flansch des Stators und dem Anschlussflansch aufgebracht wird. Um eine ausreichende Dichtigkeit der Exzenterschneckenpumpe sicherzustellen, ist es daher erforderlich, dass der Distanzring allseitig mit einer gleichmäßigen Vorspannkraft klemmfixiert wird. Es besteht daher die Gefahr, dass der Distanzring durch ungenaue oder unsachgemäße Montage verkantet und so die Dichtigkeitserfordernisse nicht erfüllt werden.In the known eccentric screw pump, the spacer ring is fixed by the pretension which is applied by means of threaded rods between a flange of the stator on the pump side and the connecting flange. In order to ensure that the progressing cavity pump is adequately sealed, it is therefore necessary for the spacer ring to be clamped on all sides with an even pretensioning force. There is therefore a risk that the Spacer ring canted due to inaccurate or improper assembly and thus the tightness requirements are not met.

Im Übrigen erfordert die vorbekannte Exzenterschneckenpumpe zusätzliche Dichtungen zwischen dem Distanzring und dem Stator, dem Distanzring und dem Anschlussflansch des Anschlussstutzens sowie dem Anschlussflansch und dem weiterführenden Rohr am Anschlussstutzen. Schließlich muss bei der Montage des Distanzrings auch sichergestellt werden, dass eine exakte Zentrierung gegenüber dem Stator erfolgt, um eine ausreichende Dichtigkeit, die insbesondere bei höheren Betriebsdrücken von größer als 6 bar kritisch zu sehen ist, zu erreichen.Moreover, the previously known eccentric screw pump requires additional seals between the spacer ring and the stator, the spacer ring and the connecting flange of the connecting piece, and the connecting flange and the continuing pipe on the connecting piece. Finally, when assembling the spacer ring, it must also be ensured that it is exactly centered in relation to the stator in order to achieve sufficient tightness, which is particularly critical at higher operating pressures of more than 6 bar.

Aus der EP 2 660 471 A1 ist ferner eine Exzenterschneckenpumpe mit einem Endstutzen bekannt, in welchen der Stator der Pumpe eingreift. Eine exakte Ausrichtung des Stators gegenüber dem Endstutzen ist damit zwar möglich. Der Endstutzen ist allerdings nicht radial entfernbar.From the EP 2 660 471 A1 is also known an eccentric screw pump with an end connection, in which the stator of the pump engages. An exact alignment of the stator with respect to the end piece is thus possible. However, the end piece cannot be removed radially.

Die Aufgabe der Erfindung besteht darin, eine Exzenterschneckenpumpe der eingangs genannten Art derart weiterzuentwickeln, dass die Montage der Exzenterschneckenpumpe vereinfacht, insbesondere zeitlich optimiert, wird, wobei gleichzeitig eine gute Dichtigkeit der Exzenterschneckenpumpe sichergestellt ist. Erfindungsgemäß wird diese Aufgabe im Hinblick auf die Exzenterschneckenpumpe durch den Gegenstand des Patentanspruchs 1 gelöst.The object of the invention is to further develop an eccentric screw pump of the type mentioned at the outset in such a way that the assembly of the eccentric screw pump is simplified, in particular optimized in terms of time, while at the same time good sealing of the eccentric screw pump is ensured. According to the invention, this object is achieved with regard to the eccentric screw pump by the subject matter of claim 1.

Insofern schlägt die Erfindung eine Exzenterschneckenpumpe mit einem Stator und einem Rotor vor, wobei der Rotor innerhalb des Stators drehbar angeordnet ist. An einem anschlussseitigen Ende des Stators ist ein radial entfernbarer Distanzring angeordnet. Der Distanzring weist dabei ein Zentriermittel auf.In this respect, the invention proposes an eccentric screw pump with a stator and a rotor, the rotor being arranged rotatably within the stator. A radially removable spacer ring is arranged on a connection-side end of the stator. The spacer ring has a centering means.

Die Erfindung unterscheidet sich somit von der vorbekannten Exzenterschneckenpumpe gemäß DE 10 2008 021 919 A1 dadurch, dass erfindungsgemäß ein Zentriermittel am Dichtdistanzring vorgesehen ist. Das Zentriermittel ermöglicht eine positionsgenaue Montage des Distanzrings und stellt somit die erforderliche Dichtigkeit der Exzenterschneckenpumpe sicher. Insgesamt wird somit das Montageverfahren vereinfacht, da die exakte Positionierung des Distanzrings bereits durch das Zentriermittel vorgegeben und nicht per Hand eingestellt werden muss. Gleichzeitig wird die übergeordnete Position des Distanzrings erhalten, die darin besteht, die Montagezeiten an der Exzenterschneckenpumpe zu verringern, indem der Distanzring radial entnommen und so der Stator durch eine Schwenkbewegung von dem Pumpenantrieb getrennt werden kann.The invention thus differs from the previously known eccentric screw pump DE 10 2008 021 919 A1 in that, according to the invention, a centering means is provided on the sealing spacer ring. The centering means enables the spacer ring to be installed in the exact position and thus ensures the required tightness of the progressing cavity pump. Overall, the assembly process is thus simplified since the exact positioning of the spacer ring is already specified by the centering means and is not set by hand got to. At the same time, the superior position of the spacer ring is maintained, which is to reduce the assembly times on the eccentric screw pump by removing the spacer ring radially and thus separating the stator from the pump drive by a pivoting movement.

Das Zentriermittel kann einstückig mit einem statorseitigen Flansch des Distanzrings ausgebildet sein. Im Allgemeinen kann vorgesehen sein, dass der Distanzring an seinem dem Stator zugewandten Längsende einen Flansch aufweist, der das Zentriermittel umfasst bzw. das Zentriermittel bildet. Gleichzeitig kann der Flansch dazu angepasst sein, Spannmittel aufzunehmen, die eine längsaxiale Verspannung des Distanzrings mit dem Stator ermöglichen.The centering means can be formed in one piece with a flange of the spacer ring on the stator side. In general, it can be provided that the spacer ring has a flange at its longitudinal end facing the stator, which flange encompasses the centering means or forms the centering means. At the same time, the flange can be adapted to accommodate tensioning means that enable longitudinal axial tensioning of the spacer ring with the stator.

Derartige Spannmittel können beispielsweise durch Gewindestangen gebildet sein. Durch den statorseitigen Flansch des Distanzrings wird somit eine verbesserte Fixierung des Distanzrings innerhalb der Exzenterschneckenpumpe, insbesondere gegenüber dem Stator, erreicht, so dass eine gute Dichtigkeit der Exzenterschneckenpumpe sichergestellt werden kann.Such clamping means can be formed, for example, by threaded rods. The flange of the spacer ring on the stator side thus achieves improved fixing of the spacer ring within the eccentric screw pump, in particular with respect to the stator, so that good tightness of the eccentric screw pump can be ensured.

Vorzugsweise ist das Zentriermittel bogenförmig, insbesondere halbringförmig, ausgebildet. Das Zentriermittel kann insofern der Außenkontur des Stators folgen. Konkret kann vorgesehen sein, dass das Zentriermittel eine formschlüssige Positionierung des Distanzrings ermöglicht. Eine solche Gestaltung eines Zentriermittels ist besonders einfach herstellbar.The centering means is preferably designed in the form of an arc, in particular in the form of a semi-ring. In this respect, the centering means can follow the outer contour of the stator. In concrete terms, it can be provided that the centering means enables the spacer ring to be positioned in a form-fitting manner. Such a design of a centering means is particularly easy to produce.

Bei einer konkreten Ausgestaltung der erfindungsgemäßen Exzenterschneckenpumpe kann vorgesehen sein, dass das Zentriermittel eine, insbesondere bogenförmige oder mehreckige, Innenfläche aufweist, die im montierten Zustand des Distanzrings an einer Außenumfangsfläche des Stators anliegt. Konkret ist also vorgesehen, dass die Innenfläche des Zentriermittels komplementär zur Außenumfangsfläche des Stator ausgebildet ist. Damit ist eine besonders einfache und effiziente Zentrierung des Distanzrings möglich.In a specific embodiment of the eccentric screw pump according to the invention, it can be provided that the centering means has an inner surface, in particular arcuate or polygonal, which rests against an outer peripheral surface of the stator when the spacer ring is in the mounted state. Specifically, it is therefore provided that the inner surface of the centering means is designed to be complementary to the outer peripheral surface of the stator. A particularly simple and efficient centering of the spacer ring is thus possible.

Im Allgemeinen ist jedenfalls vorgesehen, dass das Zentriermittel bzw. dessen Innenfläche höchstens einen Halbring bildet, um sicherzustellen, dass der Distanzring radial entfernbar ist. Dabei hat sich weiterhin als vorteilhaft herausgestellt, dass die Innenfläche, die eine Anlagefläche des Zentriermittels gegenüber dem Stator bildet, außerhalb der nassen Dichtflächen der Exzenterschneckenpumpe angeordnet ist.In general, it is in any case provided that the centering means or its inner surface forms at most a half ring in order to ensure that the Spacer ring is radially removable. It has also been found to be advantageous that the inner surface, which forms a contact surface of the centering means with respect to the stator, is arranged outside the wet sealing surfaces of the eccentric screw pump.

Insofern besteht bei der Erfindung eine Funktionstrennung zwischen der Zentrierfunktion, die durch Flächenkontakt im trockenen Bereich der Exzenterschneckenpumpe erfolgt und der Dichtungsfunktion, die in einer davon unabhängigen Flächenebene gewährleistet ist.In this respect, there is a functional separation in the invention between the centering function, which takes place through surface contact in the dry area of the eccentric screw pump, and the sealing function, which is guaranteed in a surface level independent of it.

Bei einer weiteren Ausgestaltung der Erfindung ist der Stator vorzugsweise durch einen Pumpenfuß abgestützt. Der Pumpenfuß kann eine bogenförmige oder mehreckige Auflagefläche umfassen, die im montierten Zustand des Pumpenfußes an einer Außenumfangsfläche des Stators anliegt. Die Auflagefläche des Pumpenfußes kann insbesondere halbringförmig ausgebildet sein. Im Allgemeinen ist es vorteilhaft, wenn die Auflagefläche des Pumpenfußes komplementär zur Außenumfangsfläche des Stators ausgebildet ist. Insofern kann der Pumpenfuß sich unmittelbar unterhalb des Zentriermittels des Distanzrings anschließen, so dass eine platzsparende und einfache Anordnung des Pumpenfußes erreicht wird. Insbesondere kann vorgesehen sein, dass die Auflagefläche des Pumpenfußes mit der Innenfläche des Zentriermittels im montierten Zustand des Zentriermittels und des Pumpenfußes eine im Wesentlichen geschlossene Ringfläche bildet. Ferner kann vorgesehen sein, dass die Auflagefläche des Pumpenfußes eine Breite aufweist, die der Breite des Zentriermittels entspricht, so dass der Pumpenfuß mit dem Zentriermittel eine gemeinsame Stirnfläche bildet.In a further embodiment of the invention, the stator is preferably supported by a pump foot. The pump foot can comprise an arcuate or polygonal bearing surface which, when the pump foot is in the mounted state, bears against an outer peripheral surface of the stator. The bearing surface of the pump foot can in particular be designed in the shape of a semi-ring. In general, it is advantageous if the support surface of the pump foot is designed to be complementary to the outer peripheral surface of the stator. In this respect, the pump foot can be connected directly below the centering means of the spacer ring, so that a space-saving and simple arrangement of the pump foot is achieved. In particular, it can be provided that the bearing surface of the pump foot forms a substantially closed annular surface with the inner surface of the centering means when the centering means and the pump foot are in the assembled state. Furthermore, it can be provided that the contact surface of the pump foot has a width that corresponds to the width of the centering means, so that the pump foot forms a common end face with the centering means.

Bei einer besonders bevorzugten Ausführungsform der erfindungsgemäßen Exzenterschneckenpumpe weist der statorseitige Flansch und/oder der Pumpenfuß Durchgangsbohrungen zur Aufnahme von Gewindestangen auf. Die Gewindestangen können insbesondere parallel zur Längsachse des Stators ausgerichtet oder ausrichtbar sein. Die Gewindestangen bilden vorzugsweise Vorspannmittel, die eine längsaxiale Vorspannkraft zwischen dem statorseitigen Flansch des Distanzrings und dem Stator aufbringen.In a particularly preferred embodiment of the eccentric screw pump according to the invention, the stator-side flange and/or the pump base has through-holes for receiving threaded rods. In particular, the threaded rods can be aligned or can be aligned parallel to the longitudinal axis of the stator. The threaded rods preferably form prestressing means which apply a longitudinally axial prestressing force between the flange of the spacer ring on the stator side and the stator.

Dazu kann der Stator an seinem antriebsseitigen Längsende ebenfalls einen antriebsseitigen Flansch aufweisen, der Durchgangsbohrungen zur Aufnahme der Vorspannmittel, insbesondere der Gewindestangen, aufweist. Auf diese Weise wird die längsaxiale Vorspannkraft, die zur Dichtigkeit der Exzenterschneckenpumpe beiträgt, unmittelbar zwischen dem Distanzring und dem Stator aufgebracht.For this purpose, the stator can also have a drive-side flange at its drive-side longitudinal end, which has through-holes for receiving the prestressing means, in particular the threaded rods. In this way, the longitudinal axial prestressing force, which contributes to the tightness of the eccentric screw pump, is applied directly between the spacer ring and the stator.

Die Durchgangsbohrungen im statorseitigen Flansch des Distanzrings sind vorzugsweise radial außerhalb einer statorseitigen Dichtfläche des Distanzrings angeordnet. Insbesondere kann zumindest ein Teil der Durchgangsbohrungen das Zentriermittel durchsetzen. Somit wird bei dieser erfindungsgemäßen Ausgestaltung eine Trennung zwischen dem Fixierungs- bzw. Befestigungsbereich und dem Dichtbereich am Distanzring erreicht.The through bores in the stator-side flange of the spacer ring are preferably arranged radially outside of a stator-side sealing surface of the spacer ring. In particular, at least some of the through-holes can pass through the centering means. In this embodiment according to the invention, a separation is thus achieved between the fixing or fastening area and the sealing area on the spacer ring.

Konkret ist der Befestigungsbereich, auf welchen durch die Vorspannmittel die Spannkraft auf den Distanzring übertragen wird, außerhalb des Dichtbereichs angeordnet. Insofern befindet sich der Befestigungsbereich in einem trockenen Bereich der Exzenterschneckenpumpe. Dadurch ist sichergestellt, dass die Fixierung des Distanzrings innerhalb der Exzenterschneckenpumpe die Dichtlinie der flüssigkeitsführenden Räume nicht stört. Dies reduziert das Betriebsrisiko der Exzenterschneckenpumpe.Specifically, the fastening area, to which the tensioning force is transmitted to the spacer ring by the pretensioning means, is arranged outside the sealing area. In this respect, the fastening area is in a dry area of the progressing cavity pump. This ensures that the fixing of the spacer ring within the progressing cavity pump does not disturb the sealing line of the liquid-carrying spaces. This reduces the operating risk of the progressing cavity pump.

Der Distanzring kann ferner einen anschlussseitigen Flansch aufweisen, der Anschlussbohrungen zur Aufnahme eines Verbindungselements für die Verbindung des Distanzrings mit einem Anschlussrohr aufweist. Der Distanzring lässt sich somit gut abdichtend mit einem Anschlussrohr verbinden und ermöglicht insofern den Anschluss der Exzenterschneckenpumpe an weiterführende Rohrleitungen.The spacer ring can also have a flange on the connection side, which has connection bores for receiving a connecting element for connecting the spacer ring to a connection pipe. The spacer ring can thus be connected to a connection pipe in a well-sealed manner and in this respect enables the progressing cavity pump to be connected to further pipelines.

Im Rahmen der vorliegenden Erfindung kann außerdem vorgesehen sein, dass der Stator ein Hüllrohr und einen Elastomerkern aufweist. Der Elastomerkern kann am anschlussseitigen Ende längsaxial über das Hüllrohr vorstehen und eine Abdichtung zwischen dem Stator und dem Distanzring bilden. So wird auf eine besonders einfache und effiziente Weise die Dichtigkeit der Exzenterschneckenpumpe hergestellt und außerdem die Demontage und Montage des Stators erleichtert. Insbesondere wird damit erreicht, dass eine zusätzliche Positionierung und Fixierung eines separaten Dichtungselements zwischen dem Stator und dem Distanzring vermeidbar ist.In the context of the present invention, it can also be provided that the stator has a cladding tube and an elastomer core. At the connection-side end, the elastomer core can protrude longitudinally and axially beyond the enveloping tube and form a seal between the stator and the spacer ring. In this way, the tightness of the progressing cavity pump is checked in a particularly simple and efficient manner manufactured and also facilitates the disassembly and assembly of the stator. In particular, this means that additional positioning and fixing of a separate sealing element between the stator and the spacer ring can be avoided.

Um die Entnahme des Distanzrings in radialer Richtung, die sich generell auf die Längsachse des Stators bzw. der gesamten Exzenterschneckenpumpe bezieht, zu erleichtern, kann der Distanzring einen Griff aufweisen. Der Griff kann parallel zur Längsachse des Distanzrings angeordnet sein. Eine besonders einfache Gestaltung des Griffs ergibt sich, wenn dieser den anschlussseitigen Flansch und den statorseitigen Flansch miteinander verbindet. Dadurch wird zwischen dem anschlussseitigen Flansch und dem statorseitigen Flansch eine Griffmulde unterhalb des Griffs bereitgestellt, die eine besonders einfache Handhabung des Distanzrings ermöglicht. Vorzugsweise ist der Griff im Bereich des Zentriermittels des Distanzrings angeordnet. Besonders bevorzugt ist es, wenn der Griff radial gegenüberliegend zum Pumpenfuß angeordnet ist.In order to facilitate removal of the spacer ring in the radial direction, which generally relates to the longitudinal axis of the stator or of the entire eccentric screw pump, the spacer ring can have a handle. The handle can be arranged parallel to the longitudinal axis of the spacer ring. A particularly simple design of the handle results when it connects the connection-side flange and the stator-side flange to one another. As a result, a recessed grip is provided below the handle between the flange on the connection side and the flange on the stator side, which recess enables the spacer ring to be handled particularly easily. The handle is preferably arranged in the area of the centering means of the spacer ring. It is particularly preferred if the handle is arranged radially opposite to the pump base.

Ferner kann im Rahmen der vorliegenden Erfindung vorgesehen sein, dass der Distanzring so mit dem Pumpenfuß verbunden ist, dass das Zentriermittel radial gegen den Stator vorspannbar ist. Mit anderen Worten, es können der Pumpenfuß und der Distanzring radial gegeneinander verspannbar sein, so dass die Innenflächen des Pumpenfußes und des Zentriermittels gegen die Außenumfangsfläche des Stators gepresst werden. Dies verbessert die Fixierung zwischen dem Distanzring und dem Stator, sorgt für eine exakte Positionierung und unterstützt die Dichtwirkung zwischen dem Distanzring und dem Stator.Furthermore, it can be provided within the scope of the present invention that the spacer ring is connected to the pump base in such a way that the centering means can be radially prestressed against the stator. In other words, the pump base and the spacer ring can be braced radially against one another, so that the inner surfaces of the pump base and the centering means are pressed against the outer peripheral surface of the stator. This improves the fixation between the spacer ring and the stator, ensures exact positioning and supports the sealing effect between the spacer ring and the stator.

Ferner kann bei der erfindungsgemäßen Exzenterschneckenpumpe vorgesehen sein, dass der Distanzring anschlussseitig einen Dichtring aufweist, der über den anschlussseitigen Flansch zur Anlage gegen eine komplementäre Dichtfläche eines Anschlussrohrs längsaxial vorsteht. Der Dichtring kann integraler Bestandteil des Distanzrings sein oder ein separates Element bilden, das mit dem Distanzring wenigstens kraftschlüssig verbindbar ist. Der Dichtring gewährleistet die Abdichtung zwischen dem Distanzring und einem daran anschließbaren Anschlussrohr.Furthermore, it can be provided in the eccentric screw pump according to the invention that the spacer ring has a sealing ring on the connection side, which protrudes longitudinally axially over the connection-side flange for bearing against a complementary sealing surface of a connecting pipe. The sealing ring can be an integral part of the spacer ring or form a separate element that can be connected to the spacer ring at least in a non-positive manner. The sealing ring ensures the seal between the spacer ring and a connecting pipe that can be connected to it.

Ein Verfahren zum Ausbau des Stators aus der zuvor beschriebenen Exzenterschneckenpumpe wird als Beispiel beschrieben, wobei der Distanzring in radialer Richtung, bezogen auf eine Längsachse des Stators, entnommen und der Stator anschließend durch eine Schwenkbewegung von einem Antriebsgehäuse getrennt wird. Das Verfahren erleichtert den Ausbau des Stators erheblich, da lediglich der Distanzring radial entfernt werden muss, um den Stator entnehmen zu können. Eine Demontage der vollständigen Pumpe aus dem Rohrleitungssystem wird somit vermieden. Insgesamt führt das Verfahren zu einem deutlich verringerten Zeitaufwand und stellt somit eine verbesserte Verfügbarkeit der Exzenterschneckenpumpe sicher. Die Erfindung wird im Folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die beigefügten, schematischen Zeichnungen näher erläutert. Darin zeigen

FIG. 1
eine Seitenansicht einer erfindungsgemäßen Exzenterschneckenpumpe nach einem bevorzugten Ausführungsbeispiel;
FIG. 2
eine Detailansicht des Distanzrings im montierten Zustand innerhalb der Exzenterschneckenpumpe gemäß FIG. 1;
FIG. 3
eine Draufsicht auf den Distanzring 20 im montierten Zustand innerhalb der Exzenterschneckenpumpe gemäß FIG. 1;
FIG. 4
eine perspektivische Ansicht des Distanzrings der Exzenterschneckenpumpe gemäß FIG. 1 in Alleinstellung;
FIG. 5
eine perspektivische Ansicht der Exzenterschneckenpumpe gemäß FIG. 1, wobei der Distanzring radial entnommen ist;
FIG. 6
eine Detailansicht im Bereich des radial entnommenen Distanzrings gemäß FIG. 5; und
FIG. 7
eine weitere Detailansicht des entnommenen Distanzrings gemäß FIG. 5 aus anderer Perspektive.
A method for removing the stator from the eccentric screw pump described above is described as an example, the spacer ring being removed in the radial direction relative to a longitudinal axis of the stator and the stator then being separated from a drive housing by a pivoting movement. The procedure makes it much easier to remove the stator, since only the spacer ring has to be removed radially in order to be able to remove the stator. A dismantling of the complete pump from the pipe system is thus avoided. Overall, the method leads to a significantly reduced time requirement and thus ensures improved availability of the progressing cavity pump. The invention is explained in more detail below using exemplary embodiments with reference to the accompanying schematic drawings. show in it
FIG. 1
a side view of an eccentric screw pump according to the invention according to a preferred embodiment;
FIG. 2
a detailed view of the spacer ring in the assembled state within the eccentric screw pump according to FIG. 1 ;
FIG. 3
a plan view of the spacer ring 20 in the assembled state within the eccentric screw pump according to FIG FIG. 1 ;
FIG. 4
a perspective view of the spacer ring of the eccentric screw pump according to FIG. 1 alone;
FIG. 5
a perspective view of the progressing cavity pump according to FIG FIG. 1 , wherein the spacer ring is removed radially;
FIG. 6
a detailed view in the area of the radially removed spacer ring according to FIG FIG. 5 ; and
FIG. 7
a further detailed view of the removed spacer ring according to FIG. 5 from another perspective.

In den beigefügten Figuren ist jeweils eine Exzenterschneckenpumpe gezeigt, die einen Pumpenantrieb 1, ein Sauggehäuse 2 sowie einen Förderabschnitt 5 aufweist. Der Förderabschnitt 5 umfasst einen Stator 10, in dem ein Rotor 11 drehbar angeordnet ist. Die Exzenterschneckenpumpe ist vorzugsweise zwischen einem Anschlussrohr 3 und einem Zuflussrohr 4 angeordnet bzw. mit dem Zuflussrohr 4 und dem Anschlussrohr 3 fluidverbunden.In the accompanying figures, an eccentric screw pump is shown in each case, which has a pump drive 1 , a suction housing 2 and a delivery section 5 . The conveyor section 5 comprises a stator 10 in which a rotor 11 is rotatably arranged. The progressing cavity pump is preferably arranged between a connecting pipe 3 and an inflow pipe 4 or is in fluid communication with the inflow pipe 4 and the connecting pipe 3 .

Über das Anschlussrohr 3 werden flüssige oder viskose Medien der Exzenterschneckenpumpe zugeführt und durch die Pumpleistung der Exzenterschneckenpumpe über das Anschlussrohr 3 ausgestoßen. Die Förderrichtung der Exzenterschneckenpumpe erfolgt also vom Zuflussrohr 4 zum Anschlussrohr 3. Dazu ist das Anschlussrohr 3 fluiddicht mit dem Sauggehäuse 2 verbunden.Liquid or viscous media are fed to the progressing cavity pump via the connection pipe 3 and are ejected via the connection pipe 3 by the pumping capacity of the progressing cavity pump. The conveying direction of the eccentric screw pump is therefore from the inflow pipe 4 to the connection pipe 3. For this purpose, the connection pipe 3 is connected to the suction housing 2 in a fluid-tight manner.

Das Sauggehäuse 2 ist ferner mit dem Pumpenantrieb 1 einerseits und dem Förderabschnitt 5 bzw. dem Stator 10 andererseits verbunden. Das aus dem Anschlussrohr 3 zugeführte Medium tritt zunächst in das Sauggehäuse 2 ein und wird über die Förderbewegung, die im Förderabschnitt 5 erfolgt, an das Anschlussrohr 3 gefördert.The suction housing 2 is also connected to the pump drive 1 on the one hand and the delivery section 5 or the stator 10 on the other hand. The medium supplied from the connecting pipe 3 first enters the suction housing 2 and is conveyed to the connecting pipe 3 via the conveying movement that takes place in the conveying section 5 .

Zwischen dem Anschlussrohr 3 und dem Stator 10 ist ein Distanzring 20 angeordnet. Der Distanzring 20 ist radial entfernbar. Mit anderen Worten, es ist der Distanzring 20 derart ausgestaltet, dass er in radialer Richtung bezogen auf eine Längsachse der Exzenterschneckenpumpe entnommen werden kann, ohne weitere, flüssigkeitsführende Bauteile der Exzenterschneckenpumpe oder des daran angeschlossenen Rohrleitungssystems entfernen zu müssen.A spacer ring 20 is arranged between the connecting pipe 3 and the stator 10 . The spacer ring 20 can be removed radially. In other words, the spacer ring 20 is designed in such a way that it can be removed in the radial direction relative to a longitudinal axis of the eccentric screw pump without having to remove other liquid-carrying components of the eccentric screw pump or the piping system connected to it.

Der Aufbau des Distanzrings 20 ist gut in den FIG. 6 und 7 erkennbar. Konkret umfasst der Distanzring 20 ein Zentriermittel 21. Das Zentriermittel 21 ermöglicht die positionsgenaue Anordnung des Distanzrings 20 bezogen auf den Stator 10.The structure of the spacer ring 20 is good in the FIG. 6 and 7 recognizable. Specifically, the spacer ring 20 includes a centering means 21. The centering means 21 enables the spacer ring 20 to be arranged with precise positioning in relation to the stator 10.

Der Distanzring 20 ist insbesondere als Rohrabschnitt ausgebildet. An den längsaxialen Enden des Distanzrings 20 ist jeweils ein Flansch 22, 23 angeordnet.The spacer ring 20 is designed in particular as a tube section. A flange 22 , 23 is arranged on each of the longitudinal axial ends of the spacer ring 20 .

Dabei ist das Zentriermittel 21 an einem statorseitigen Flansch 22 angeordnet, so dass im montierten Zustand das Zentriermittel 21 mit dem Stator 10 zusammenwirkt. Der statorseitige Flansch 22 ist vorzugsweise einstückig mit dem Zentriermittel 21 ausgebildet, wobei eine mehrteilige Ausbildung ebenfalls denkbar ist. Beispielsweise kann das Zentriermittel 21 mit dem statorseitigen Flansch 22 schraubverbunden sein.The centering means 21 is arranged on a flange 22 on the stator side, so that the centering means 21 interacts with the stator 10 in the assembled state. The flange 22 on the stator side is preferably designed in one piece with the centering means 21, a multi-part design also being conceivable. For example, the centering means 21 can be screw-connected to the flange 22 on the stator side.

Das Zentriermittel 21 ist bei dem in den Figuren dargestellten Ausführungsbeispiel bogenförmig, konkret halbringförmig, ausgebildet. Insbesondere weist das Zentriermittel 21 eine Innenfläche 24 auf, die bogenförmig, vorzugsweise halbkreisförmig, gekrümmt ist. Die Außenfläche des Zentriermittels 21 kann eine davon abweichende Form aufweisen.In the exemplary embodiment illustrated in the figures, the centering means 21 is designed in the form of an arc, specifically in the form of a half ring. In particular, the centering means 21 has an inner surface 24 which is curved in the shape of an arc, preferably in the shape of a semicircle. The outer surface of the centering means 21 can have a different shape.

Insbesondere ist die Innenfläche 24 des Zentriermittels 21 an die Krümmung der Außenumfangsfläche des Stators 10 angepasst. Im montierten Zustand des Distanzrings 20 liegt die Innenfläche 24 des Zentriermittels 21 vorzugsweise flächenbündig bzw. mit vollflächigem Kontakt auf der Außenumfangsfläche 18 des Stators 10 auf. Im Wesentlichen bildet das Zentriermittel 21 eine in Längsrichtung des Distanzrings 20 erstreckte Aufdickung bzw. Materialverstärkung des statorseitigen Flanschs 22.In particular, the inner surface 24 of the centering means 21 is adapted to the curvature of the outer peripheral surface of the stator 10 . When the spacer ring 20 is in the installed state, the inner surface 24 of the centering means 21 preferably lies flush with the surface or with full-surface contact on the outer peripheral surface 18 of the stator 10 . The centering means 21 essentially forms a thickening or material reinforcement of the stator-side flange 22 that extends in the longitudinal direction of the spacer ring 20.

Alternativ kann vorgesehen sein, dass die Innenfläche 24 des Zentriermittels 21 eine mehreckige Ausgestaltung aufweist. Vorzugsweise ist zumindest das anschlussseitige Ende 13 des Stators 10 komplementär dazu ausgebildet, so dass das Zentriermittel 21 passgenau auf das anschlussseitige Ende 13 des Stators 10 aufsetzbar ist. Die mehreckige Form der Innenfläche 24 kann insbesondere ein halbes, regelmäßiges Sechseck oder ein halbes, regelmäßiges Achteck bilden. Dies gilt insbesondere in Blickrichtung der parallel zur Längsachse des Distanzrings 20.Alternatively, it can be provided that the inner surface 24 of the centering means 21 has a polygonal configuration. At least the end 13 of the stator 10 on the connection side is preferably designed to complement it, so that the centering means 21 can be placed with an exact fit on the end 13 of the stator 10 on the connection side. The polygonal shape of the inner surface 24 can in particular form half a regular hexagon or half a regular octagon. This applies in particular when viewed in the direction parallel to the longitudinal axis of the spacer ring 20.

Entsprechend kann das anschlussseitige Ende 13 des Stators 10 eine sechseckige oder achteckige Querschnittsgeometrie aufweisen. Andere, regelmäßig mehreckige bzw. polygonale Formen sind möglich, wobei das Zentriermittel 21 vorzugsweise eine entsprechende, komplementäre Form aufweist, die durch hälftige Teilung der Form des anschlussseitigen Endes 13 des Stators 10 gebildet ist. Insgesamt wird durch die übereinstimmenden Formen des Zentriermittels 21 und des statorseitigen Endes 13 des Stators 10 eine Zentrierung erreicht, durch welche die radiale Position des Distanzrings 20 bezüglich des Stators festlegbar ist.Correspondingly, the connection-side end 13 of the stator 10 can have a hexagonal or octagonal cross-sectional geometry. Other, regularly polygonal or polygonal shapes are possible, with the centering means 21 preferably having a corresponding, complementary shape, which is formed by dividing the shape of the connection-side end 13 of the stator 10 in half. Overall, the matching shapes of the centering means 21 and the stator-side end 13 of the stator 10 result in centering, by which the radial position of the spacer ring 20 with respect to the stator can be fixed.

Die Innenfläche 24 des Zentriermittels 21 steht im Wesentlichen senkrecht auf einer statorseitigen Dichtfläche 25 des Distanzrings 20. Die statorseitige Dichtfläche 25 ist im Wesentlichen ringförmig ausgebildet und liegt im montierten Zustand des Distanzrings 20 dichtend am Stator 10 an. Der Stator 10 weist ein Hüllrohr 16 auf, das einen Elastomerkern 17 umgibt. Der Elastomerkern 17 kann längsaxial in Richtung des Distanzrings 20 über das Hüllrohr 16 vorstehen, so dass der Elastomerkern 17 eine Abdichtung gegen die statorseitige Dichtfläche 25 des Distanzrings 20 bildet. Alternativ kann vorgesehen sein, dass zwischen der statorseitigen Dichtfläche 25 und dem Stator 10 ein separates Dichtungselement angeordnet ist.The inner surface 24 of the centering means 21 is essentially perpendicular to a stator-side sealing surface 25 of the spacer ring 20. The stator-side sealing surface 25 is essentially ring-shaped and is in the installed state of the spacer ring 20 in sealing contact with the stator 10. The stator 10 has an enveloping tube 16 which surrounds an elastomer core 17 . The elastomer core 17 can protrude longitudinally axially in the direction of the spacer ring 20 over the cladding tube 16 so that the elastomer core 17 forms a seal against the stator-side sealing surface 25 of the spacer ring 20 . Alternatively, it can be provided that a separate sealing element is arranged between the stator-side sealing surface 25 and the stator 10 .

Der statorseitige Flansch 22 ragt zumindest teilweise radial über die Außenumfangsfläche 18 des Stators 10 vor. Dieser über die Außenumfangsfläche 18 vorstehende Abschnitt des statorseitigen Flanschs 22 bildet einen Befestigungsbereich 26. Der statorseitige Flansch 22, insbesondere der Befestigungsbereich 26 kann einen geraden Umfangsabschnitt 28 umfassen. Der gerade Umfangsabschnitt 28 ist vorzugsweise radial gegenüber dem Zentriermittel 21 angeordnet (FIG. 6).The flange 22 on the stator side protrudes at least partially radially beyond the outer peripheral surface 18 of the stator 10 . This section of the stator-side flange 22 protruding beyond the outer peripheral surface 18 forms a fastening area 26 . The stator-side flange 22 , in particular the fastening area 26 , can comprise a straight peripheral section 28 . The straight peripheral section 28 is preferably arranged radially opposite the centering means 21 ( FIG. 6 ).

Der Befestigungsbereich 26 umfasst Durchgangsbohrungen 27, die zur Aufnahme von Gewindestangen 14 dienen. Mittels der Gewindestangen 14, die durch die Durchgangsbohrungen 27 geführt werden können, kann der Distanzring 20 längsaxial gegen den Stator 10 vorgespannt werden. Die Anordnung der Gewindestangen 14 ist gut in den FIG. 1 und 5 erkennbar. Insbesondere weist der Stator 10 an seinem antriebsseitigen Ende 12 ebenfalls einen Flansch bzw. einen radial nach außen vorstehenden Befestigungsbereich auf, der Durchgangsbohrungen zur Aufnahme der Gewindestangen 14 umfasst.The fastening area 26 includes through-holes 27 which are used to hold threaded rods 14 . By means of the threaded rods 14, which can be passed through the through-holes 27, the spacer ring 20 can be prestressed against the stator 10 in the longitudinal direction. The arrangement of the threaded rods 14 is good in the FIG. 1 and 5 recognizable. In particular, the stator 10 also has a flange or flange at its drive-side end 12 radially outwardly protruding fastening area, which includes through bores for receiving the threaded rods 14 .

Die Gewindestangen 14, wobei bei dem vorliegenden Ausführungsbeispiel vorzugsweise vier Gewindestangen 14 vorgesehen sind, erstrecken sich durch die Durchgangsbohrungen 27 des antriebsseitigen Endes 12 des Stators 10 und des statorseitigen Flansches 22 des Distanzrings 20 und sind mit Muttern 15 fixiert. Mittels der Muttern 15 erfolgt ebenfalls die Vorspannung, die zur längsaxialen, kraftschlüssigen Verbindung des Distanzrings 22 mit dem Stator 10 dient.The threaded rods 14, four threaded rods 14 preferably being provided in the present exemplary embodiment, extend through the through bores 27 of the drive-side end 12 of the stator 10 and the stator-side flange 22 of the spacer ring 20 and are fixed with nuts 15. The nuts 15 are also used for prestressing, which serves to connect the spacer ring 22 to the stator 10 in a force-fitting manner in the longitudinal direction.

An den statorseitigen Flansch 22 des Distanzrings 20 schließt sich ein Rohrabschnitt 37 des Distanzrings 20 an. Der Rohrabschnitt 37 weist einen Außenumfang auf, der kleiner als der Außenumfang des statorseitigen Flansches 22 ist. Längsaxial gegenüberliegend des statorseitigen Flansches 22 ist am Distanzring 20 ein anschlussseitiger Flansch 23 ausgebildet, dessen Außendurchmesser ebenfalls größer als der Außendurchmesser des Rohrabschnitts 37 ist. Der anschlussseitige Flansch 23 umfasst mehrere Anschlussbohrungen 34, die die Verbindung des Distanzrings 20 mit dem Anschlussrohr 23 ermöglichen.A tubular section 37 of the spacer ring 20 adjoins the flange 22 of the spacer ring 20 on the stator side. The pipe section 37 has an outer circumference that is smaller than the outer circumference of the stator-side flange 22 . A connection-side flange 23 is formed on the spacer ring 20 longitudinally and axially opposite the stator-side flange 22 , the outside diameter of which is also larger than the outside diameter of the pipe section 37 . The flange 23 on the connection side comprises a plurality of connection bores 34 which enable the spacer ring 20 to be connected to the connection pipe 23 .

Dazu sind Verbindungselemente 36 in Form von Schrauben vorgesehen, die sich im montierten Zustand des Distanzrings 20 durch einen Anschlussflansch 6 des Anschlussrohrs 3 und die Anschlussbohrungen 34 des anschlussseitigen Flansches 23 erstrecken und mittels Muttern fixiert sind. Die Verbindungselemente 36 bringen insofern eine Vorspannkraft zwischen dem Distanzring 20 und dem Anschlussrohr 3 auf, um eine flüssigkeitsdichte Verbindung zwischen Distanzring 20 und Anschlussrohr 3 sicherzustellen.For this purpose, connecting elements 36 are provided in the form of screws which, in the mounted state of the spacer ring 20, extend through a connecting flange 6 of the connecting pipe 3 and the connecting bores 34 of the connecting-side flange 23 and are fixed by means of nuts. To this extent, the connecting elements 36 apply a prestressing force between the spacer ring 20 and the connection pipe 3 in order to ensure a liquid-tight connection between the spacer ring 20 and the connection pipe 3 .

In FIG. 7 ist der anschlussseitige Flansch 23 des Distanzrings 20 gut erkennbar. Darin ist ebenfalls zu sehen, dass am anschlussseitigen Flansch 23 des Distanzrings 20 ein Dichtring 33 ausgebildet ist, der längsaxial über eine Ringfläche des anschlussseitigen Flansches 23 vorsteht. Durch die vorstehende Ausgestaltung des Dichtrings 33 ist eine besonders einfache Oberflächenbearbeitung der anschlussseitigen Dichtfläche 32 möglich, die am Dichtring 33 ausgebildet ist.In FIG. 7 the connection-side flange 23 of the spacer ring 20 is clearly visible. It can also be seen that a sealing ring 33 is formed on the connection-side flange 23 of the spacer ring 20 , which protrudes longitudinally axially over an annular surface of the connection-side flange 23 . The projecting design of the sealing ring 33 enables a particularly simple surface treatment of the sealing surface 32 on the connection side, which is formed on the sealing ring 33 .

Die anschlussseitige Dichtfläche 32 kann auf diese Weise mit einer besonders hohen Oberflächengüte ausgestaltet werden, so dass die Dichtigkeit der Verbindung zwischen dem Distanzring 20 und dem Anschlussrohr 3 verbessert wird. Die anschlussseitige Dichtfläche 32 liegt im montierten Zustand des Distanzrings 20 bündig und insbesondere flüssigkeitsdicht an einer Anschlussdichtfläche 7 des Anschlussrohrs 3 an. Es ist auch möglich, dass zwischen der anschlussseitigen Dichtfläche 32 am Dichtring 33 und der Anschlussdichtfläche 7 am Anschlussrohr 3 ein zusätzliches Dichtungselement vorgesehen ist.In this way, the sealing surface 32 on the connection side can be designed with a particularly high surface quality, so that the tightness of the connection between the spacer ring 20 and the connection pipe 3 is improved. When the spacer ring 20 is in the installed state, the sealing surface 32 on the connection side lies flush and in particular in a liquid-tight manner on a connection sealing surface 7 of the connection pipe 3 . It is also possible for an additional sealing element to be provided between the connection-side sealing surface 32 on the sealing ring 33 and the connection sealing surface 7 on the connecting pipe 3 .

In den FIG. 2, 3, 6 und 7 ist außerdem gut erkennbar, dass der Distanzring 20 ferner einen Griff 31 aufweist. Der Griff 31 erstreckt sich vom statorseitigen Flansch 22 zum anschlussseitigen Flansch 23. Dabei ist der Griff 31 vorzugsweise parallel zu einer Längsachse des Distanzrings 20 bzw. parallel zur Flüssigkeitsförderrichtung ausgerichtet.In the FIG. 2, 3 , 6 and 7 it is also clearly visible that the spacer ring 20 also has a handle 31 . The handle 31 extends from the stator-side flange 22 to the connection-side flange 23. The handle 31 is preferably aligned parallel to a longitudinal axis of the spacer ring 20 or parallel to the liquid conveying direction.

Auf diese Weise ist unterhalb des Griffs 31 eine Griffmulde 38 gebildet, die einerseits durch den Griff 31, andererseits durch den Rohrabschnitt 37 und ferner durch den statorseitigen Flansch 22 und den anschlussseitigen Flansch 23 begrenzt ist. Der Griff 31 ist vorzugsweise mittig bezüglich des Zentriermittels 21 ausgerichtet. Insbesondere ist der Griff 31 derart am Distanzring 20 angeordnet, dass der Griff 31 im montierten Zustand des Distanzrings 20 vertikal nach oben ragt.In this way, a recessed grip 38 is formed below the handle 31, which is delimited on the one hand by the handle 31, on the other hand by the pipe section 37 and also by the flange 22 on the stator side and the flange 23 on the connection side. The handle 31 is preferably centered with respect to the centering means 21 . In particular, the handle 31 is arranged on the spacer ring 20 in such a way that the handle 31 protrudes vertically upwards when the spacer ring 20 is in the mounted state.

Der Griff 31 ist insbesondere radial gegenüber einem Pumpenfuß 40 angeordnet, wenn der Distanzring 20 in der Exzenterschneckenpumpe montiert ist. Der Pumpenfuß 40 weist zumindest abschnittsweise ein L-Profil auf, das sich insbesondere in der Seitenansicht gemäß FIG. 2 zeigt. Konkret kann der Pumpenfuß 40 als Blechteil ausgebildet sein, das zur Bildung eines Stützwinkels 43 abgekantet ist. Der Stützwinkel 43 bildet im Wesentlichen eine Auflagefläche zur Abstützung des Pumpenfußes 40 auf einer Bodenebene.The handle 31 is in particular arranged radially opposite a pump foot 40 when the spacer ring 20 is mounted in the eccentric screw pump. The pump base 40 has, at least in sections, an L-profile, which can be seen particularly in the side view according to FIG FIG. 2 indicates. In concrete terms, the pump base 40 can be designed as a sheet metal part that is bent over to form a support bracket 43 . The support bracket 43 essentially forms a bearing surface for supporting the pump foot 40 on a floor level.

Konkret ist vorgesehen, dass der Pumpenfuß einen bodenseitigen Schenkel 44 und einen statorseitigen Schenkel 45 aufweist, wobei der statorseitige Schenkel 45 im Wesentlichen senkrecht auf dem bodenseitigen Schenkel 44 angeordnet ist. Der bodenseitige Schenkel kann im Wesentlichen durch zwei voneinander beabstandet angeordnete Stützwinkel 43 gebildet sein. Zwischen dem Stützwinkel 43 ist eine Ausnehmung 46 vorgesehen (FIG. 4).In concrete terms, it is provided that the pump foot has a leg 44 on the bottom side and a leg 45 on the stator side, the leg 45 on the stator side being in the Substantially perpendicular to the bottom leg 44 is arranged. The leg on the bottom can essentially be formed by two support brackets 43 arranged at a distance from one another. A recess 46 is provided between the support bracket 43 ( FIG. 4 ).

In FIG. 4 ist die Anordnung des Pumpenfußes 40 bezüglich des Distanzrings 20 im montierten Zustand der Exzenterschneckenpumpe gezeigt. Insbesondere ist erkennbar, dass der Pumpenfuß 40, konkret dessen bodenseitiger Schenkel 44, eine Auflagefläche 41 umfasst, die im Wesentlichen bogenförmig bzw. halbkreisförmig gewölbt ist. Dabei ist die Krümmung der Auflagefläche 41 an die Krümmung der Außenumfangsfläche 18 des Stators 10 angepasst. Im montierten Zustand des Pumpenfußes 40 und des Distanzrings 20 bilden die Auflagefläche 41 des Pumpenfußes 40 und die Innenfläche 24 des Zentriermittels 21 eine gemeinsame Ringfläche 35.In FIG. 4 shows the arrangement of the pump foot 40 with respect to the spacer ring 20 in the assembled state of the eccentric screw pump. In particular, it can be seen that the pump foot 40, specifically its leg 44 on the bottom, comprises a bearing surface 41 which is curved essentially in the shape of an arc or a semicircle. In this case, the curvature of the bearing surface 41 is adapted to the curvature of the outer peripheral surface 18 of the stator 10 . When the pump foot 40 and the spacer ring 20 are in the assembled state, the bearing surface 41 of the pump foot 40 and the inner surface 24 of the centering means 21 form a common annular surface 35.

Die Ringfläche 35 kann im Wesentlichen geschlossen sein, wobei vorgesehen ist, dass sowohl die Auflagefläche 41, als auch die Innenfläche 24 jeweils einen Halbring der Ringfläche 35 bilden. Die Innenfläche 24 und die Auflagefläche 41 stehen senkrecht auf der statorseitigen Dichtfläche 25 des Distanzrings 20 und begrenzen insofern einen Dichtflächenbereich des Distanzrings 20 statorseitig. Der Pumpenfuß 40 umfasst ferner Endflächen 42, die in vollflächigem Kontakt mit Endflächen 29 des Zentriermittels 21 stehen.The annular surface 35 can be essentially closed, it being provided that both the bearing surface 41 and the inner surface 24 each form a half ring of the annular surface 35 . The inner surface 24 and the bearing surface 41 are perpendicular to the stator-side sealing surface 25 of the spacer ring 20 and in this respect delimit a sealing surface area of the spacer ring 20 on the stator side. The pump foot 40 also includes end surfaces 42 which are in full-surface contact with the end surfaces 29 of the centering means 21 .

Mit anderen Worten, es liegt das Zentriermittel 21 mit seinem Endflächen 29 auf den Endflächen 42 des Pumpenfußes 40 auf. Im Pumpenfuß 40, insbesondere im statorseitigen Schenkel 45, sind Durchgangsbohrungen 27 angeordnet, die mit den Durchgangsbohrungen 27 des statorseitigen Flansches 22 des Distanzrings 20 fluchten und insofern ebenfalls die Gewindestangen 14 aufnehmen.In other words, the centering means 21 rests with its end faces 29 on the end faces 42 of the pump foot 40 . In the pump base 40, in particular in the stator-side leg 45, there are through-holes 27 which are aligned with the through-holes 27 of the stator-side flange 22 of the spacer ring 20 and to this extent also receive the threaded rods 14.

In einer alternativen Gestaltungsvariante kann die Auflagefläche 41 des Pumpenfußes 40, insbesondere analog zur Innenfläche 24 des Zentriermittels 21, mehreckig, insbesondere regelmäßig hälftig polygonal, ausgeführt sein. Vorzugsweise bildet die Auflagefläche 41 eine halbe Sechseckform oder eine halbe Achteckform. Im montierten Zustand des Pumpenfußes 40 und des Distanzrings 20 können die Innenfläche 24 des Zentriermittels 21 und die Auflagefläche 41 des Pumpenfußes 40 eine geschlossene, regelmäßige Polygonform bilden, die komplementär zu einer regelmäßigen Polygonform des anschlussseitigen Endes 13 des Stators 10 ausgebildet ist.In an alternative design variant, the bearing surface 41 of the pump foot 40, in particular analogous to the inner surface 24 of the centering means 21, can be polygonal, in particular regularly half polygonal. Preferably, the bearing surface 41 forms a half hexagonal shape or half an octagonal shape. When the pump foot 40 and the spacer ring 20 are assembled the inner surface 24 of the centering means 21 and the bearing surface 41 of the pump foot 40 can form a closed, regular polygonal shape which is complementary to a regular polygonal shape of the connection-side end 13 of the stator 10 .

Bevorzugt ist es, wenn die Polygonformen des anschlussseitigen Endes 13 des Stators 10 und der Kombination aus der Innenfläche 24 des Zentriermittels 10 und der Auflagefläche 41 des Pumpenfußes 40 jeweils ein Achteck bilden.It is preferred if the polygonal shapes of the connection-side end 13 of the stator 10 and the combination of the inner surface 24 of the centering means 10 and the bearing surface 41 of the pump foot 40 each form an octagon.

Wie in FIG. 2 gut erkennbar ist, weist der Pumpenfuß 40, insbesondere dessen statorseitiger Schenkel 45, eine Dicke bzw. Breite auf, die im Wesentlichen der Breite des Zentriermittels 21 entspricht. Damit wird erreicht, dass das Zentriermittel 21 mit dem Pumpenfuß 40, insbesondere dem statorseitigen Schenkel 45, eine gemeinsame, vorzugsweise ebenengleiche, Stirnfläche 30 bildet.As in FIG. 2 is clearly visible, the pump base 40, in particular its stator-side limb 45, has a thickness or width which essentially corresponds to the width of the centering means 21. The result of this is that the centering means 21 forms a common, preferably level, end face 30 with the pump base 40, in particular the stator-side leg 45.

Die Gestaltung des Distanzrings 20 ermöglicht einen besonders einfachen Ausbau und insbesondere Austausch des Stators 10, der üblicherweise einem hohen Verschleiß unterliegt. Dies gilt insbesondere für den Elastomerkern 17 des Stators 10. Wie in FIG. 5 gut erkennbar ist, wird zum Ausbau des Stators 10 zunächst die Fixierung des Distanzrings 20 gelöst. Dazu werden einerseits die Verbindungselemente 26 bzw. Schrauben am anschlussseitigen Flansch 23 des Distanzrings 20 gelöst und entfernt.The design of the spacer ring 20 enables a particularly simple removal and in particular replacement of the stator 10, which is usually subject to a high level of wear. This applies in particular to the elastomer core 17 of the stator 10. As in FIG. 5 is clearly visible, to remove the stator 10, the fixing of the spacer ring 20 is first released. For this purpose, on the one hand, the connecting elements 26 or screws on the connection-side flange 23 of the spacer ring 20 are loosened and removed.

Anschließend werden die Muttern 15 der Gewindestangen 14 am anschlussseitigen Ende 13 des Stators 10 gelöst. Die Gewindestangen 14 können dann in Richtung des Pumpenantriebs 1 geschoben werden, so dass die Durchgangsbohrungen 27 am Distanzring 20 freigelegt werden. Anschließend kann der Distanzring 20, vorzugsweise mit Hilfe des Griffes 31, in radialer Richtung, insbesondere vertikal nach oben, entnommen bzw. herausgehoben werden.The nuts 15 of the threaded rods 14 are then loosened at the end 13 of the stator 10 on the connection side. The threaded rods 14 can then be pushed in the direction of the pump drive 1 so that the through bores 27 on the spacer ring 20 are exposed. The spacer ring 20 can then be removed or lifted out in the radial direction, in particular vertically upwards, preferably with the aid of the handle 31 .

Dadurch wird zwischen dem Anschlussrohr 3 und dem Stator 10 der nötige Freiraum geschaffen, um den Stator 10 durch eine Schwenkbewegung, bei der insbesondere das anschlussseitige Ende 13 des Stators 10 angehoben wird, von dem Sauggehäuse 2 zu lösen. Dazu kann der Stator 10 zunächst leicht in Richtung des Anschlussrohrs 3 längsaxial bezogen auf die Längsachse der Exzenterschneckenpumpe verschoben und dann seitlich entnommen werden.This creates the necessary free space between the connection pipe 3 and the stator 10 in order to detach the stator 10 from the suction housing 2 by means of a pivoting movement, during which the end 13 of the stator 10 on the connection side in particular is lifted. For this purpose, the stator 10 can initially slightly in the direction of the connecting pipe 3 are shifted longitudinally axially relative to the longitudinal axis of the eccentric screw pump and then removed laterally.

Die Montage eines neuen Stators 10 erfolgt in umgekehrter Reihenfolge. Der Stator 10 wird zunächst seitlich zwischen Anschlussrohr 3 und Sauggehäuse 2 eingeschoben und mittels des Pumpenfußes 40 koaxial positioniert. Anschließend wird der Stator 10 in Richtung der Längsachse der Exzenterschneckenpumpe an das Sauggehäuse 2 angeschlossen. Der Distanzring 20 wird sodann radial zwischen Anschlussrohr 3 und Stator 10 eingesetzt.A new stator 10 is assembled in reverse order. The stator 10 is first inserted laterally between the connection pipe 3 and the suction housing 2 and positioned coaxially by means of the pump foot 40 . The stator 10 is then connected to the suction housing 2 in the direction of the longitudinal axis of the eccentric screw pump. The spacer ring 20 is then inserted radially between the connection pipe 3 and the stator 10 .

Anschließend erfolgt die Verschraubung des Distanzrings 20 mit den Gewindestangen 14, so dass eine Vorspannkraft zwischen Distanzring 20 und Stator 10 aufgebracht wird. Gleichzeitig bzw. zuvor oder danach, kann der Distanzring 20 mittels der Verbindungselemente 36 mit dem Anschlussrohr 3 verbunden und abdichtend vorgespannt werden.The spacer ring 20 is then screwed to the threaded rods 14 so that a prestressing force is applied between the spacer ring 20 and the stator 10 . At the same time, or before or after, the spacer ring 20 can be connected to the connecting pipe 3 by means of the connecting elements 36 and can be prestressed to form a seal.

Insgesamt ermöglicht die Erfindung einen radialen Ausbau des Stators 10, ohne die Dichtlinien der Exzenterschneckenpumpe zu stören oder zusätzliche Abdichtungen vorsehen zu müssen. Durch die Möglichkeit, den Distanzring 20 radial entnehmen zu können, ist außerdem gewährleistet, dass zum Wechsel der wichtigsten Verschleißteile, insbesondere des Stators 10, die gesamte Exzenterschneckenpumpe an ihrem Montageort verbleiben kann.Overall, the invention enables the stator 10 to be expanded radially without disturbing the sealing lines of the eccentric screw pump or having to provide additional seals. The possibility of being able to remove the spacer ring 20 radially also ensures that the entire eccentric screw pump can remain at its installation site when changing the most important wear parts, in particular the stator 10 .

Insofern bildet die Erfindung eine Schnellwechseleinrichtung, die den Wartungsaufwand einer Exzenterschneckenpumpe erheblich reduziert. Eine weitere Optimierung des Zeitaufwands für die Wartung der Exzenterschneckenpumpe wird durch die einfache Zentrierung des Distanzrings 20 mittels des Zentriermittels 21 erreicht, die ebenfalls für eine gute und sichere Abdichtung der flüssigkeitsführenden Bereiche Sorge trägt.In this respect, the invention forms a quick-change device that significantly reduces the maintenance effort of an eccentric screw pump. A further optimization of the time required for the maintenance of the eccentric screw pump is achieved by simply centering the spacer ring 20 by means of the centering means 21, which also ensures good and reliable sealing of the liquid-carrying areas.

BezugszeichenlisteReference List

11
Pumpenantriebpump drive
22
Sauggehäusesuction housing
33
Anschlussrohrconnecting pipe
44
Zuflussrohrinflow pipe
55
Förderabschnittconveyor section
66
Anschlussflanschconnection flange
77
Anschlussdichtflächeconnection sealing surface
1010
Statorstator
1111
Rotorrotor
1212
Antriebsseitiges EndeDrive end
1313
Anschlussseitiges EndeConnection end
1414
Gewindestangethreaded rod
1515
Mutternnuts
1616
Hüllrohrcladding tube
1717
Elastomerkernelastomer core
1818
Außenumfangsflächeouter peripheral surface
2020
Distanzringspacer ring
2121
Zentriermittelcentering means
2222
Statorseitiger FlanschStator side flange
2323
Anschlussseitiger FlanschConnection side flange
2424
InnenflächeInner surface
2525
Statorseitige DichtflächeStator-side sealing surface
2626
Befestigungsbereichmounting area
2727
Durchgangsbohrungthrough hole
2828
Gerader UmfangsabschnittStraight perimeter section
2929
Endfläche des Zentriermittels 21End surface of the centering means 21
3030
Stirnflächeface
3131
GriffHandle
3232
Anschlussseitige DichtflächeConnection-side sealing surface
3333
Dichtringsealing ring
3434
Anschlussbohrungconnection hole
3535
Ringflächering surface
3636
Verbindungselementfastener
3737
Rohrabschnittpipe section
3838
Griffmulderecessed grip
4040
Pumpenfußpump foot
4141
Auflageflächebearing surface
4242
Endfläche des Pumpenfußes 40End surface of the pump foot 40
4343
Stützwinkelsupport bracket
4444
Bodenseitiger SchenkelBottom leg
4545
Statorseitiger SchenkelStator side leg
4646
Ausnehmungrecess

Claims (15)

  1. Eccentric screw pump with a stator (10) and with a rotor (11), which is arranged rotatably within the stator (10), whereby a spacer ring (20), which is removeable radially in relation to the longitudinal axis of the stator (10), is arranged on a connection-side end (12) of the stator (10),
    characterized in that
    the spacer ring (20) has a form-fitting centring means (21) and the centring means (21) has an inner surface (24) which, in the fitted state of the spacer ring (20), abuts against an outer circumferential surface (18) of a casing tube (16) of the stator (10).
  2. Eccentric screw pump according to Claim 1,
    characterized in that
    the centring means (21) is formed in one piece with a stator-side flange (22) of the spacer ring (20).
  3. Eccentric screw pump according to one of the preceding claims,
    characterized in that
    the centring means (21) is of arcuate, in particular half-ring-shaped, form.
  4. Eccentric screw pump according to one of the preceding claims,
    characterized in that
    the centring means (21) has an arcuate or multi-cornered inner surface (24) which, in the fitted state of the spacer ring (20), abuts against the outer circumferential surface (18) of the casing tube (16) of the stator (10).
  5. Eccentric screw pump according to one of the preceding claims,
    characterized in that
    the stator (10) is supported by a pump foot (40), whereby the pump foot (40) has an arcuate or multi-cornered support surface (41) which, in the fitted state of the pump foot (40), abuts against an outer circumferential surface (18) of the stator.
  6. Eccentric screw pump according to Claim 5,
    characterized in that,
    in the fitted state of the spacer ring (20) and the pump foot (40), the support surface (41) of the pump foot (40) forms, together with the inner surface (24) of the centring means (21), a substantially closed ring surface (35).
  7. Eccentric screw pump according to Claim 5 or 6,
    characterized in that
    the support surface (41) of the pump foot (40) has a width which corresponds to the width of the centring means (21), so that the pump foot (40) forms, together with the centring means (21), a common face surface (30).
  8. Eccentric screw pump according to one of Claims 2 to 7,
    characterized in that
    the stator-side flange (22) has through bores (27) for receiving, especially oriented or orientable parallel to the longitudinal axis of the stator, threaded rods (14).
  9. Eccentric screw pump according to one of Claims 5 to 8,
    characterized in that
    the pump foot (40) has through bores (27) for receiving, especially oriented or orientable parallel to the longitudinal axis of the stator, threaded rods (14).
  10. Eccentric screw pump according to one of the preceding claims,
    characterized in that
    the spacer ring (20) has a connection-side flange (23), which has connection bores (34) for receiving a connecting element (36) for connecting the spacer ring (20) to a connection pipe (3).
  11. Eccentric screw pump according to one of the preceding claims,
    characterized in that
    the stator (10) has a casing tube (16) and an elastomer core (17), whereby, at the connection-side end (13), the elastomer core (17) projects longitudinally axially beyond the casing tube (16) and forms a seal between the stator (10) and the spacer ring (20).
  12. Eccentric screw pump according to one of the preceding claims,
    characterized in that
    the spacer ring (20) has a handle (31).
  13. Eccentric screw pump according to Claim 12,
    characterized in that
    the handle (31) is arranged parallel to a longitudinal axis of the spacer ring (20) and connects the connection-side flange (23) and the stator-side flange (22) to one another.
  14. Eccentric screw pump according to one of the preceding claims,
    characterized in that,
    on the connection side, the spacer ring (20) has a sealing ring (33), which projects longitudinally axially beyond the connection-side flange (23) for abutment against a complementary connection sealing surface (44) of a connection pipe (3).
  15. Eccentric screw pump according to one of the preceding claims,
    characterized in that
    the inner surface (24) of the centring means (21) is formed in a manner complementary to the outer circumferential surface (18) of the casing tube (16) of the stator (10)
    and/or
    the inner surface (24), which forms an abutment surface of the centring means (21) with respect to the stator (10), is arranged outside the wet sealing surfaces of the eccentric screw pump
    and/or
    there is a functional separation between the centring function, which is implemented by surface contact in the dry region of the eccentric screw pump, and the sealing function, which is ensured in a surface plane which is independent thereof,
    and/or
    the inner surface (24) forms at most a half-ring in order to ensure that the spacer ring (20) is removeable radially
    and/or
    the spacer ring (20) is configured in such a way that the spacer ring (20) is removeable in a radial direction without further liquid-carrying components of the eccentric screw pump or of the pipeline system connected thereto having to be removed.
EP16160296.6A 2015-03-23 2016-03-15 Eccentric screw pump Active EP3096014B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015104300.9A DE102015104300B4 (en) 2015-03-23 2015-03-23 Eccentric screw pump and method for removing a stator from such an eccentric screw pump

Publications (2)

Publication Number Publication Date
EP3096014A1 EP3096014A1 (en) 2016-11-23
EP3096014B1 true EP3096014B1 (en) 2022-11-02

Family

ID=55661173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16160296.6A Active EP3096014B1 (en) 2015-03-23 2016-03-15 Eccentric screw pump

Country Status (2)

Country Link
EP (1) EP3096014B1 (en)
DE (1) DE102015104300B4 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016121581B4 (en) 2016-11-10 2018-07-26 Seepex Gmbh Cavity Pump
DE102020128310A1 (en) 2020-10-28 2022-04-28 Audi Aktiengesellschaft bipolar plate and fuel cell stack
CN113565755A (en) * 2021-07-23 2021-10-29 杨成兴 Direct-drive variable-frequency permanent magnet motor of screw pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10207483C1 (en) * 2002-02-22 2003-06-18 Netzsch Mohnopumpen Gmbh Eccentric peristaltic pump for viscous fluids has curved shaft connected between rotor and drive shaft with latter coaxial
FR2876755B1 (en) * 2004-10-20 2007-01-26 Pcm Pompes Sa PUMPING DEVICE WITH PROGRESSIVE CAVITY PUMP
DE102008021919A1 (en) 2008-05-02 2009-11-05 Seepex Gmbh Eccentric screw pump, has spacer ring arranged between stator and connection piece, where spacer ring is detachable for disassembly of stator and attached under interconnection of flat seals to stator and/or to connection piece
CN201250777Y (en) * 2008-08-22 2009-06-03 徐德顺 Stacked-disc metal-sheath screw pump
FR2948424B1 (en) * 2009-07-23 2017-07-21 Pcm PROGRESSIVE CAVITY PUMP AND ASSOCIATED PUMPING DEVICE
JP5821058B2 (en) * 2010-12-27 2015-11-24 兵神装備株式会社 Uniaxial eccentric screw pump

Also Published As

Publication number Publication date
EP3096014A1 (en) 2016-11-23
DE102015104300B4 (en) 2016-12-01
DE102015104300A1 (en) 2016-09-29

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