EP3824162B1 - Pump housing - Google Patents

Pump housing Download PDF

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Publication number
EP3824162B1
EP3824162B1 EP19718682.8A EP19718682A EP3824162B1 EP 3824162 B1 EP3824162 B1 EP 3824162B1 EP 19718682 A EP19718682 A EP 19718682A EP 3824162 B1 EP3824162 B1 EP 3824162B1
Authority
EP
European Patent Office
Prior art keywords
housing
connecting piece
pump
pump housing
inlet
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
EP19718682.8A
Other languages
German (de)
French (fr)
Other versions
EP3824162A1 (en
Inventor
Norman Dicks
Marcel Griesdorn
Stephan Mottyll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seepex GmbH
Original Assignee
Seepex GmbH
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Publication date
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Publication of EP3824162A1 publication Critical patent/EP3824162A1/en
Application granted granted Critical
Publication of EP3824162B1 publication Critical patent/EP3824162B1/en
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    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/005—Removing contaminants, deposits or scale from the pump; Cleaning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0065—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions for eccentric movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/10—Rotary-piston pumps specially adapted for elastic fluids 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
    • F04C18/107—Rotary-piston pumps specially adapted for elastic fluids 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
    • F04C18/1075—Rotary-piston pumps specially adapted for elastic fluids 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 material, 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
    • 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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/60—Shafts
    • 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
    • F04C2250/00—Geometry
    • F04C2250/10—Geometry of the inlet or outlet
    • F04C2250/101—Geometry of the inlet or outlet of the inlet

Definitions

  • the invention relates to a pump housing for an eccentric screw pump.
  • the pump housing has a jacket extending along a longitudinal axis of the housing and a first (drive-side) front opening to which a shaft seal for a connecting shaft can be connected, as well as a second (stator-side) front opening to which a stator can be connected.
  • the pump housing has a tubular inlet connection oriented transversely to the longitudinal axis of the housing for supplying a medium to be pumped (with the pump).
  • the invention also relates to an eccentric screw pump with such a pump housing, which is also referred to as a suction housing.
  • a pump housing which is also referred to as a suction housing.
  • Such an eccentric screw pump has a stator and a rotor rotating in the stator, the pump housing described being connected to the stator on the suction side, which is also referred to as the suction housing.
  • the eccentric screw pump has a drive for the rotor, the drive z. B. drives the rotor via a connecting shaft and a coupling rod.
  • the coupling rod compensates for the eccentric movement of the rotor or the end of the rotor relative to the connecting shaft.
  • a shaft seal is provided, which z. B. can be designed as a mechanical seal.
  • the housing jacket of the pump housing or the suction housing is preferably (essentially) cylindrical in at least some areas, preferably at least in the area of the inlet connection. In this case, the longitudinal axis of the housing corresponds to the cylinder
  • Such an eccentric screw pump is a pump from the group of rotating positive displacement pumps that are used to pump a wide variety of media and, in particular, highly viscous liquids in a wide variety of industrial sectors.
  • the liquids to be pumped can e.g. B. also contain solids.
  • the pump housing according to the invention or the eccentric screw pump according to the invention is preferably used as a food pump and therefore preferably used for conveying food. It is also known as a hygiene pump and is used wherever clean, sterile and hygienic work is required, especially in the food, pharmaceutical, cosmetics and chemical industries. Such pumps follow strict hygiene regulations.
  • a cleaning medium is conveyed through the pump with the operated pump or a separately connected cleaning pump and thus the pump and also the suction housing are cleaned.
  • the cleaning medium is therefore supplied through the inlet port, which in normal operation of the pump also serves to supply the medium to be pumped, and is conveyed with the rotor through the suction housing and the stator into the area of the pressure port connected to the stator on the pressure side.
  • CIP clean-in-place flushing
  • detachment areas and dead space areas close to the wall are critical in eccentric screw pumps, which can impair cleaning.
  • Particularly critical in practice can be, for example, b. be the area of the housing in which the shaft seal (e.g. mechanical seal) is arranged.
  • the inlet ports are connected centrally and consequently in a radial orientation to the cylindrical housing jacket, usually in the area of the mechanical seal, which z. B. is arranged near the first front opening of the suction housing.
  • the cleaning liquid flowing in through the central inlet connection is divided when it hits the mechanical seal, so that cleaning liquid also reaches the area below the mechanical seal.
  • problems can arise during cleaning due to the division due to insufficient flow under the mechanical seal.
  • the division of the flow can also lead to a stagnation point above the mechanical seal and this can lead to problems with cleaning even above the mechanical seal.
  • a suction housing of an eccentric screw pump is known in a special design.
  • the suction housing has an inlet connection for the medium to be pumped, which is connected in the radial direction to the housing jacket.
  • the cleaning does not take place via the inlet port, so that the cleaning medium is not conveyed through the pump itself during operation of the pump, but rather the cleaning medium is conveyed through the special cleaning port in a special cleaning operation when the rotor is at a standstill.
  • An eccentric screw pump of the usual design is e.g. B. also from the DE 10 2012 001 617 A1 known.
  • the inlet is connected radially to the housing jacket in a conventional manner, specifically in the area of the mechanical seal.
  • the pump is provided with a storage space in the area of the transition to the stator, whereby the storage space should be designed without recesses and/or bulges, which means that very good cleanability and hygiene should be achieved, especially in the field of food technology.
  • the invention is based on the technical problem of creating a pump housing for an eccentric screw pump, in particular for a food pump or hygiene pump of the type described above, which is characterized by optimized cleaning options with a simple construction.
  • the invention teaches in a generic pump housing of the type described above that the geometry of the inlet connection (including its orientation) is designed such that as the medium flows through the inlet connection into the interior of the housing, a flow is generated which (in the transition between inlet ports and housing jacket) has an inflow direction which has a radial directional component directed outwards from the longitudinal axis of the housing and/or an axial directional component directed towards the first front-side (drive-side opening).
  • the invention is based on the knowledge that in eccentric screw pumps for the food sector or for other areas with the highest hygiene regulations, the cleaning of the pump housing, which is preferably designed as a suction housing, is of particular importance. This applies in particular to CIP cleaning, in which the cleaning medium is introduced into the pump housing with minimal dismantling or conversion work through the inlet connection, which during operation is used to supply the medium to be pumped, and with the rotor through the pump housing and the stator is conveyed through.
  • the invention initially includes embodiments in which the inlet connection is connected to the cylindrical housing jacket centrally with respect to the longitudinal axis of the housing. However, the inlet connection is preferably connected (decentrally) offset to the longitudinal axis of the housing (essentially) tangentially to the housing jacket. It always has the geometry according to the invention to generate the flow directions explained.
  • the invention has recognized that cleaning can be optimized by a decentralized connection of the inlet connection and consequently a (substantially) tangential arrangement of the inlet connection.
  • this fundamentally known tangential connection is further optimized according to the invention, namely by a geometry that provides an asymmetrical and preferably a "double asymmetrical" flow or inflow into the pump housing and in particular in the area of the mechanical seal generated.
  • the cleaning medium therefore does not flow exactly tangentially through the inlet port into the interior of the housing, but rather (at the transition from the inlet port to the interior of the housing) the medium is deflected towards the outer wall of the housing and consequently away from the longitudinal axis of the housing, so that a particularly effective Flushing around the mechanical seal preferably arranged in this area is generated.
  • the inflow is additionally aligned, which is directed towards the end face of the suction housing facing away from the current and consequently towards the frontal first opening of the suction housing, so that the end face of the suction housing is better cleaned and also the wall areas below the mechanical seal and the sealing points between the mechanical seal and suction housing be better washed.
  • the geometry of the inlet port according to the invention can also be implemented not only in the preferred embodiment, in which the inlet port is arranged decentrally offset from the longitudinal axis of the housing, but also in conventional embodiments with the inlet port connected centrally to the housing jacket.
  • the cleaning is therefore optimized according to the invention by the flow directed specifically outwards from the longitudinal axis of the housing and, on the other hand, by the flow directed towards the end face of the suction housing, and consequently by a special radial directional component and/or a special axial directional component of the inflow direction of the flow.
  • These two measures can be implemented independently of one another and preferably in combination.
  • high levels are achieved Flow velocities or high velocity gradients on the wall are achieved, which lead to a significant reduction in dead space areas and improved cleaning of the wall areas.
  • the geometry according to the invention can be used in a first embodiment, for. B. realized in that the inner cross-sectional area of the inlet connection tapers at least in sections in the direction of the housing jacket, ie in the inflow direction, preferably asymmetrically and particularly preferably doubly asymmetrically. Reducing the cross section leads to an advantageous increase in the inflow velocity and thus to better cleaning results. This can be done e.g. B. the output cross section of the inlet connection (in the area of the housing jacket) can be reduced relative to its inlet cross section.
  • the output cross section is asymmetrically offset relative to its input cross section - based on the longitudinal direction of the nozzle, preferably in the axial direction towards the first front-side housing opening and / or in the radial direction away from the longitudinal axis of the housing outwards or towards the outer housing wall . Due to the described asymmetrical offset of the output cross section relative to the input cross section of the inlet connection, the flow according to the invention can be realized with the mentioned radial directional component and/or the mentioned axial directional component. Both the output cross section and the input cross section (in a top view of the nozzle) can be round, but with different diameters.
  • the output cross section and/or the input cross section is not round, but rather z. B. are oval or elliptical, but also in the manner described with a reduced output cross section compared to the input cross section. After all, others can too Cross-sectional shapes can be realized so that individual adjustment of the geometry is possible.
  • the inlet port has a spiral-shaped inner wall and thus forms a spiral-shaped flow channel, which in turn generates a spiral-shaped flow within the inlet port, so that the medium enters the interior of the pump housing from the inlet port in the orientation defined according to the invention .
  • the orientation of the flow or inflow direction of the medium which is essential to the invention, is therefore realized in this embodiment by a spiral-shaped inner wall of the inlet connection.
  • the inlet connection is designed geometrically in the manner described, i.e. H. the inlet port itself is realized with the asymmetrical cross-sectional taper described or with the spiral-shaped design described.
  • the pump housing is therefore made available directly with the geometry according to the invention during production.
  • the pump housing is preferably made of stainless steel. Alternatively, it can also be made from cast steel. Alternatively, embodiments made of plastic can also be considered.
  • a specially designed nozzle insert that can be inserted into a (conventional) cylindrical pipe nozzle/inlet nozzle and thus provides the geometry that generates the flow essential to the invention.
  • a separately manufactured nozzle insert can e.g. b. can also be used when retrofitting a pump with a classic tangentially connected cylindrical pipe socket.
  • the nozzle insert can e.g. B. made of stainless steel, cast steel or alternatively made of plastic.
  • the invention also relates to an eccentric screw pump with a pump housing of the type described.
  • Such an eccentric screw pump has, in a fundamentally known manner, in addition to the pump housing/suction housing, at least one stator connected to the second front opening of the pump housing, a rotor arranged in the stator, an in The coupling rod arranged in the pump housing and a drive which is connected to the coupling rod via a connecting shaft.
  • the drive therefore drives the rotating unit, which consists of a rotor and coupling rod, via the connecting shaft.
  • the coupling rod can z. B. be connected in a generally known manner via joints to the rotor on the one hand and the connecting shaft on the other. Easy-to-assemble joints are preferably used for improved cleaning.
  • classic joints can be dispensed with in the transition areas between the connecting shaft and coupling rod on the one hand and the coupling rod and rotor on the other.
  • the use of a flexible or flexible coupling rod is possible, e.g. B. made of a titanium material.
  • a flexible coupling rod can also be directly connected in one piece to the rotor.
  • a shaft seal within the pump housing in the area of the (drive-side) front opening, e.g. B. mechanical seal, provided for sealing the suction housing.
  • the inlet port is arranged in the area of the shaft seal, ie it opens into the area of the shaft seal into the housing casing, so that the shaft seal is protected from the medium to be conveyed, e.g. B. cleaning medium is washed around.
  • the pump housing or the pump additionally has one or more bypass openings or bypass ports.
  • the pump housing which is designed as a suction housing, can have a first bypass connection near the second front opening and consequently on the stator side, which is also oriented transversely to the longitudinal direction of the housing.
  • Another housing is connected to the end of the stator opposite the suction housing, which z. B. is referred to as a pressure port.
  • This pressure port can have a second bypass port, which is also oriented transversely to the longitudinal direction of the housing, whereby the two bypass ports can be connected to one another via a bypass line.
  • bypass serves to direct excess cleaning medium that is not conveyed through the stator chambers from the suction housing into the pressure housing. It is important that these bypass connections do not serve to supply a cleaning medium separately, but are used in the course of cleaning by pump operation with a rotating rotor, with the cleaning medium being supplied via the inlet connection.
  • the invention also relates to a method for cleaning an eccentric screw pump of the type described.
  • This method is characterized in that a cleaning medium is pumped from the inlet port via the suction housing through the stator with the rotatingly driven rotor, a flow flowing around the mechanical seal being generated whose inflow direction has, in the manner according to the invention, a radial directional component directed outwards from the longitudinal axis of the housing and/or an axial directional component directed towards the first front-side opening (and consequently a directional component opposite to the main flow direction).
  • an eccentric screw pump is shown in simplified form, which in its basic structure has a stator 1, a rotor 2 rotating in the stator 1 and a drive 3 for the rotor.
  • a pump housing 4 which is referred to as suction housing 4 is connected to the stator 1 on the suction side.
  • a housing part connected to the stator 1 on the pressure side is z. B. referred to as a connecting piece or pressure piece 15.
  • the pump housing 4 has a housing jacket 5 which extends along the housing longitudinal axis L and is cylindrical in the exemplary embodiment, so that the housing longitudinal axis L forms the cylinder axis L.
  • a connecting shaft 8 is connected to the drive 3 and drives the rotor 2 via a coupling rod 9, the coupling rod 9 compensating for the eccentric movement of the rotor 2 or the rotor end relative to the centrally rotating connecting shaft 8. This is possible using joints or a flexible coupling rod. Details are not shown.
  • the pump housing 4 has a first front opening 6 on the drive side, which is sealed via a shaft seal 7 for the connecting shaft 8. Furthermore, the pump housing 4 has a second front opening 10 on the stator side, to which the stator 1 is connected.
  • the pump housing 4 has a tubular inlet connection 11 for supplying the medium to be pumped, which is oriented transversely to the longitudinal axis of the housing or cylinder axis L and is connected to the housing jacket 5. This inlet connection 11 is connected to the housing jacket 5 in a decentralized manner and consequently offset from the longitudinal axis L of the housing in a substantially tangential orientation.
  • the medium to be conveyed is supplied via the inlet connection 11 and pumped via the suction housing 4 or its second opening 10 through the stator 1 into the area of the pressure connection 15.
  • a cleaning medium is supplied via the inlet connection 11 during cleaning operation, which is also conveyed by the rotating rotor 2 during operation of the pump.
  • the cleaning medium can also be conveyed through the pump shown using a separately connected cleaning pump.
  • the already mentioned decentralized, tangential connection of the inlet connection 11 to the housing jacket 5 leads to an optimized flushing around the mechanical seal 7 and thus to improved cleaning of the areas below and / or above the mechanical seal 7.
  • the geometry of the inlet connection is now not only tangential , but it is designed in such a way that in the course of the medium or cleaning medium flowing in through the inlet connection 11 into the interior of the housing, a flow is generated which has an inflow direction R, which has a radial directional component R1 directed outwards from the longitudinal axis L of the housing and also has an axial directional component R2 directed towards the first front opening 6. This is done on the Fig. 2 and 3 referred.
  • the inflow direction R is the direction of the flow S of the medium in the area of the transition from the inlet connection 11 into the interior of the housing or onto the housing jacket 5.
  • a flow S is generated which is directed towards the front opening 6 and is therefore opposite to the main flow direction H in the housing.
  • the flow S or inflow direction R has an axial directional component R2 directed towards the first front opening 6, which is therefore opposite to the main flow direction H of the pump.
  • the conventional orientation is indicated by the reference number N, so that it can be seen that the inflow direction R is aligned with respect to this conventional, vertical direction N towards the end face of the suction housing 4.
  • This deflection of the flow S in the axial direction against the mechanical seal 7 leads to improved cleaning of the end face of the suction housing 4 facing away from the current.
  • the wall areas below and/or above the mechanical seal 7 are also better washed.
  • Figs. 5a, 5b, 5c and 5d show modifications of the embodiment Fig. 4 .
  • Fig. 5a shows an embodiment in which the inlet port opposite Fig. 4 on the other side of the housing relative to the longitudinal axis L is connected, so that the embodiment according to Fig. 5a preferred for one opposite Fig. 4 reverse direction of rotation of the pump is used.
  • the embodiment according to Fig. 5b differs from that according to 5a in particular by a different dimensioning of the cross-sectional taper.
  • the Fig. 4 , 5a and 5b Show embodiments with round cross sections Fig. 5c a modified embodiment with a non-round cross section, e.g. B. an oval or elliptical cross section.
  • Fig. 5d shows an optional embodiment with a variably adapted cross section of the inlet connection.
  • Fig. 6 to 8 show a modified embodiment of the invention, in which the asymmetrical flow S or R according to the invention is generated by a special inlet port 11, which has a spiral-shaped inner wall which forms a spiral-shaped flow channel 14, so that a spiral-shaped flow is generated within the inlet port 11 , in the manner described with radial directional components R1 and axial directional component R2 enters the interior of the housing.
  • This embodiment also makes it possible to realize the inflow essential to the invention for improved cleaning.
  • two bypass connections 12, 13 are provided, which can be connected to one another with a bypass line, not shown.
  • the first bypass connection 12 is connected to the suction housing 4, specifically in the vicinity of the second front opening 10 of the suction housing 4.
  • the second bypass connection 13 is connected to the pressure connection 15.
  • the cleaning medium is also used to clean the pump in the embodiment Fig. 6 to 8 supplied via the inlet connection 11 and conveyed through the pump by means of the rotor 2 during operation of the pump. However, the cleaning medium can be conveyed back to the first bypass connection 12 via the second bypass connection 13 and the bypass line, not shown, and thus a particularly efficient cleaning of the pump and in particular the stator can be achieved.
  • the pump housing or suction housing 4 is made up of several parts, e.g. B. can be designed in two parts and can have two housing sections 4a, 4b arranged one behind the other in the axial direction.
  • the invention only shows one embodiment in which the inlet connection 11 is arranged offset decentrally relative to the longitudinal axis L of the pump.
  • the geometry of the inlet connection 11 according to the invention can also be implemented in a variant, not shown, in which the inlet connection is oriented centrally with respect to the longitudinal axis L. Even in such an embodiment z. B. the cross-sectional taper shown in the figures can be realized. The same applies to the possibility of a spiral-shaped flow channel.

Description

Die Erfindung betrifft ein Pumpengehäuse für eine Exzenterschneckenpumpe. Das Pumpengehäuse weist einen sich entlang einer Gehäuselängsachse erstreckenden Mantel und eine erste (antriebsseitige) stirnseitige Öffnung auf, an die eine Wellenabdichtung für eine Verbindungswelle anschließbar ist, sowie eine zweite (statorseitige) stirnseitige Öffnung, an die ein Stator anschließbar ist.The invention relates to a pump housing for an eccentric screw pump. The pump housing has a jacket extending along a longitudinal axis of the housing and a first (drive-side) front opening to which a shaft seal for a connecting shaft can be connected, as well as a second (stator-side) front opening to which a stator can be connected.

Ferner weist das Pumpengehäuse eine quer zur Gehäuselängsachse orientierten rohrförmigen Einlassstutzen für die Zuführung eines (mit der Pumpe) zu fördernden Mediums auf.Furthermore, the pump housing has a tubular inlet connection oriented transversely to the longitudinal axis of the housing for supplying a medium to be pumped (with the pump).

Außerdem betrifft die Erfindung eine Exzenterschneckenpumpe mit einem solchen Pumpengehäuse, das auch als Sauggehäuse bezeichnet wird. Eine solche Exzenterschneckenpumpe weist einen Stator und einen in dem Stator rotierenden Rotor auf, wobei saugseitig an den Stator das beschriebene Pumpengehäuse angeschlossen ist, das auch als Sauggehäuse bezeichnet wird. Ferner weist die Exzenterschneckenpumpe einen Antrieb für den Rotor auf, wobei der Antrieb z. B. über eine Verbindungswelle und eine Kuppelstange den Rotor antreibt. Die Kuppelstange gleicht die exzentrische Bewegung des Rotors bzw. des Rotorendes gegenüber der Verbindungswelle aus. Zur flüssigkeitsdichten Abdichtung des Pumpengehäuses gegenüber der Umgebung ist eine Wellenabdichtung vorgesehen, die z. B. als Gleitringdichtung ausgebildet sein kann. Bevorzugt ist der Gehäusemantel des Pumpengehäuses bzw. des Sauggehäuses zumindest bereichsweise (im Wesentlichen) zylindrisch ausgebildet, und zwar bevorzugt zumindest im Bereich des Einlassstutzens. Die Gehäuselängsachse entspricht in diesem Fall der Zylinderachse.The invention also relates to an eccentric screw pump with such a pump housing, which is also referred to as a suction housing. Such an eccentric screw pump has a stator and a rotor rotating in the stator, the pump housing described being connected to the stator on the suction side, which is also referred to as the suction housing. Furthermore, the eccentric screw pump has a drive for the rotor, the drive z. B. drives the rotor via a connecting shaft and a coupling rod. The coupling rod compensates for the eccentric movement of the rotor or the end of the rotor relative to the connecting shaft. For a liquid-tight seal of the pump housing from the environment, a shaft seal is provided, which z. B. can be designed as a mechanical seal. The housing jacket of the pump housing or the suction housing is preferably (essentially) cylindrical in at least some areas, preferably at least in the area of the inlet connection. In this case, the longitudinal axis of the housing corresponds to the cylinder axis.

Bei einer solchen Exzenterschneckenpumpe handelt es sich um eine Pumpe aus der Gruppe der rotierenden Verdrängerpumpen, die zur Förderung unterschiedlichster Medien und insbesondere hochviskoser Flüssigkeiten in unterschiedlichsten Industriebereichen verwendet werden. Die zu fördernden Flüssigkeiten können dabei z. B. auch Feststoffanteile enthalten. Das erfindungsgemäße Pumpengehäuse bzw. die erfindungsgemäße Exzenterschneckenpumpe wird bevorzugt als Lebensmittelpumpe und folglich bevorzugt für die Förderung von Lebensmitteln eingesetzt. Sie wird auch als Hygienepumpe bezeichnet und überall dort eingesetzt, wo sauber, steril und hygienisch gearbeitet werden muss, insbesondere in der Lebensmittel-, Pharma-, Kosmetik- und Chemieindustrie. Solche Pumpen folgen hohen Hygienevorschriften.Such an eccentric screw pump is a pump from the group of rotating positive displacement pumps that are used to pump a wide variety of media and, in particular, highly viscous liquids in a wide variety of industrial sectors. The liquids to be pumped can e.g. B. also contain solids. The pump housing according to the invention or the eccentric screw pump according to the invention is preferably used as a food pump and therefore preferably used for conveying food. It is also known as a hygiene pump and is used wherever clean, sterile and hygienic work is required, especially in the food, pharmaceutical, cosmetics and chemical industries. Such pumps follow strict hygiene regulations.

Damit steht bei derartigen Lebensmittelpumpen bzw. Hygienepumpen eine besonders effektive und wirksame Reinigung der Pumpe und insbesondere des Pumpengehäuses im Vordergrund. Im Zuge der Reinigung kann z. B. ein Reinigungsmedium mit der betriebenen Pumpe oder einer separat angeschlossenen Reinigungspumpe durch die Pumpe gefördert und damit die Pumpe und auch das Sauggehäuse gereinigt werden. Das Reinigungsmedium wird folglich durch den Einlassstutzen, der im Normalbetrieb der Pumpe auch der Zuführung des zu fördernden Mediums dient, zugeführt und mit dem Rotor durch das Sauggehäuse und den Stator in den Bereich des druckseitig an den Stator angeschlossenen Druckstutzens gefördert. Dabei gelingt eine sogenannte "clean-in-place-Spülung (CIP)", die es ermöglicht, sämtliche Flächen in der Pumpe, die mit dem Produkt in Berührung kommen, mit minimaler Demontagearbeit zu reinigen. Kritisch sind in der Praxis bei Exzenterschneckenpumpen wandnahe Ablösegebiete und Totraumgebiete, die eine Reinigung beeinträchtigen können. Besonders kritisch kann in der Praxis z. B. der Bereich des Gehäuses sein, in dem die Wellenabdichtung (z. B. Gleitringdichtung) angeordnet ist.With such food pumps or hygiene pumps, the focus is on particularly effective and effective cleaning of the pump and in particular the pump housing. In the course of cleaning, e.g. B. a cleaning medium is conveyed through the pump with the operated pump or a separately connected cleaning pump and thus the pump and also the suction housing are cleaned. The cleaning medium is therefore supplied through the inlet port, which in normal operation of the pump also serves to supply the medium to be pumped, and is conveyed with the rotor through the suction housing and the stator into the area of the pressure port connected to the stator on the pressure side. A so-called “clean-in-place flushing (CIP)” is achieved, which makes it possible to clean all surfaces in the pump that come into contact with the product with minimal dismantling work. In practice, detachment areas and dead space areas close to the wall are critical in eccentric screw pumps, which can impair cleaning. Particularly critical in practice can be, for example, b. be the area of the housing in which the shaft seal (e.g. mechanical seal) is arranged.

So sind bei herkömmlichen Exzenterschneckenpumpen bzw. deren Pumpengehäusen die Einlassstutzen zentral und folglich in radialer Orientierung an den zylindrischen Gehäusemantel angeschlossen, und zwar in der Regel im Bereich der Gleitringdichtung, die z. B. in der Nähe der ersten stirnseitigen Öffnung des Sauggehäuses angeordnet ist. Die durch den zentralen Einlassstutzen einströmende Reinigungsflüssigkeit wird beim Auftreffen auf die Gleitringdichtung aufgeteilt, so dass zwar auch Reinigungsflüssigkeit in den Bereich unterhalb der Gleitringdichtung gelangt. Dennoch kann es bei der Reinigung durch die Aufteilung aufgrund unzureichender Unterströmung der Gleitringdichtung zu Problemen kommen. Die Aufteilung der Strömung kann auch zu einem Staupunkt oberhalb der Gleitringdichtung führen und dieses kann zu Problemen bei der Reinigung auch oberhalb der Gleitringdichtung führen.In conventional eccentric screw pumps or their pump housings, the inlet ports are connected centrally and consequently in a radial orientation to the cylindrical housing jacket, usually in the area of the mechanical seal, which z. B. is arranged near the first front opening of the suction housing. The cleaning liquid flowing in through the central inlet connection is divided when it hits the mechanical seal, so that cleaning liquid also reaches the area below the mechanical seal. However, problems can arise during cleaning due to the division due to insufficient flow under the mechanical seal. The division of the flow can also lead to a stagnation point above the mechanical seal and this can lead to problems with cleaning even above the mechanical seal.

Zur Verbesserung der Reinigung sind aus der Praxis Lösungen bekannt, bei denen der Einlassstutzen nicht zentral/radial orientiert ist, sondern tangential an den Gehäusemantel angeschlossen ist, so dass kein geteilter Förderstrom, sondern ein einseitiger, durchgehender Förderstrom die Gleitringdichtung umspült. Eine solche Gehäusegeometrie eines Pumpengehäuses für eine Exzenterschneckenpumpe wird z. B. in der DE 10 2008 014 235 A1 beschrieben.To improve cleaning, solutions are known from practice in which the inlet port is not centrally/radially oriented, but is connected tangentially to the housing jacket, so that there is no divided flow, but a one-sided, continuous flow around the mechanical seal. Such a housing geometry of a pump housing for an eccentric screw pump is z. B. in the DE 10 2008 014 235 A1 described.

Aus der DE 297 15 797 U1 ist ein Sauggehäuse einer Exzenterschneckenpumpe in spezieller Bauart bekannt. Das Sauggehäuse weist einen in radialer Richtung an den Gehäusemantel angeschlossenen Einlassstutzen für das zu fördernde Medium auf. Zu Reinigungszwecken sind zusätzliche Rohrstutzen angeschlossen, die zur Erzeugung von turbulenten Rohrströmungen im Sauggehäuse, insbesondere im Bereich der Gelenkanschlüsse, winklig angesetzt sind. Die Reinigung erfolgt dabei nicht über den Einlassstutzen, so dass das Reinigungsmedium auch nicht im Betrieb der Pumpe selbst durch die Pumpe hindurchgefördert wird, sondern das Reinigungsmedium wird in einem speziellen Reinigungsbetrieb bei Stillstand des Rotors durch die speziellen Reinigungsstutzen gefördert.From the DE 297 15 797 U1 a suction housing of an eccentric screw pump is known in a special design. The suction housing has an inlet connection for the medium to be pumped, which is connected in the radial direction to the housing jacket. There are additional pipe sockets for cleaning purposes connected, which are set at an angle to generate turbulent pipe flows in the suction housing, especially in the area of the joint connections. The cleaning does not take place via the inlet port, so that the cleaning medium is not conveyed through the pump itself during operation of the pump, but rather the cleaning medium is conveyed through the special cleaning port in a special cleaning operation when the rotor is at a standstill.

Eine Exzenterschneckenpumpe üblicher Bauart ist z. B. auch aus der DE 10 2012 001 617 A1 bekannt. Der Einlass ist in herkömmlicher Weise radial an den Gehäusemantel angeschlossen, und zwar im Bereich der Gleitringdichtung. Die Pumpe ist mit einem Stauraum im Bereich des Übergangs zum Stator versehen, wobei der Stauraum aussparungs- und/oder ausbuchtungsfrei ausgestaltet sein soll, wodurch vor allem im Bereich der Lebensmitteltechnik eine sehr gute Reinigbarkeit und Hygiene erreicht werden soll.An eccentric screw pump of the usual design is e.g. B. also from the DE 10 2012 001 617 A1 known. The inlet is connected radially to the housing jacket in a conventional manner, specifically in the area of the mechanical seal. The pump is provided with a storage space in the area of the transition to the stator, whereby the storage space should be designed without recesses and/or bulges, which means that very good cleanability and hygiene should be achieved, especially in the field of food technology.

Aus der DE 38 18 508 A1 ist eine Exzenterschneckenpumpe in sterilisierbarer Ausführungsform mit einer speziellen Art der Anströmung im Bereich des Anschlussstutzens bekannt. Auf diese Weise erhält die Flüssigkeit einen Drall und tritt aus dem Anschlussstutzen in der Drehrichtung dieses Dralls.From the DE 38 18 508 A1 An eccentric screw pump is known in a sterilizable embodiment with a special type of flow in the area of the connecting piece. In this way, the liquid is given a twist and emerges from the connecting piece in the direction of rotation of this twist.

Ausgehend von dem vorbekannten Stand der Technik liegt der Erfindung das technische Problem zugrunde, ein Pumpengehäuse für eine Exzenterschneckenpumpe, insbesondere für eine Lebensmittelpumpe bzw. Hygienepumpe der eingangs beschriebenen Art zu schaffen, welches bzw. welche sich bei einfacher Konstruktion durch optimierte Reinigungsmöglichkeiten auszeichnet.Based on the known prior art, the invention is based on the technical problem of creating a pump housing for an eccentric screw pump, in particular for a food pump or hygiene pump of the type described above, which is characterized by optimized cleaning options with a simple construction.

Diese Aufgabe wird durch ein Pumpenghäuse für eine Exzenterschneckenpumpe mit den Merkmalen des Anspruchs 1 gelöst.This task is achieved by a pump housing for an eccentric screw pump with the features of claim 1.

Zur Lösung dieser Aufgabe lehrt die Erfindung bei einem gattungsgemäßen Pumpengehäuse der eingangs beschriebenen Art, dass die Geometrie des Einlassstutzens (einschl. dessen Orientierung) derart ausgestaltet ist, dass im Zuge des Einströmens des Mediums durch den Einlassstutzen in das Gehäuseinnere eine Strömung erzeugt wird, die (im Übergang zwischen Einlassstutzen und Gehäusemantel) eine Einströmrichtung aufweist, die eine nach außen von der Gehäuselängsachse weggerichtete radiale Richtungskomponente und/oder eine zu der ersten stirnseitigen (antriebsseitigen Öffnung) hingerichtete, axiale Richtungskomponente aufweist.To solve this problem, the invention teaches in a generic pump housing of the type described above that the geometry of the inlet connection (including its orientation) is designed such that as the medium flows through the inlet connection into the interior of the housing, a flow is generated which (in the transition between inlet ports and housing jacket) has an inflow direction which has a radial directional component directed outwards from the longitudinal axis of the housing and/or an axial directional component directed towards the first front-side (drive-side opening).

Die Erfindung geht dabei von der Erkenntnis aus, dass bei Exzenterschneckenpumpen für den Lebensmittelbereich oder für andere Bereiche mit höchsten Hygienevorschriften der Reinigung des Pumpengehäuses, das bevorzugt als Sauggehäuse ausgebildet ist, besondere Bedeutung zukommt. Dieses gilt insbesondere für eine CIP-Reinigung, bei welcher das Reinigungsmedium mit minimalen Demontage- bzw. Umrüstungsarbeiten durch den Einlassstutzen, der im Betrieb auf der Zuführung des zu fördernden Mediums dient, in das Pumpengehäuse eingeführt und mit dem Rotor durch das Pumpengehäuse und den Stator hindurchgefördert wird. Die Erfindung umfasst dabei zunächst einmal Ausführungsformen, bei denen der Einlassstutzen zentral bezogen auf die Gehäuselängsachse an den zylindrischen Gehäusemantel angeschlossen ist. Bevorzugt ist der Einlassstutzen jedoch (dezentral) versetzt zu der Gehäuselängsachse (im Wesentlichen) tangential an den Gehäusemantel angeschlossen. Dabei weist er stets die erfindungsgemäße Geometrie zur Erzeugung der erläuterten Strömungsrichtungen auf.The invention is based on the knowledge that in eccentric screw pumps for the food sector or for other areas with the highest hygiene regulations, the cleaning of the pump housing, which is preferably designed as a suction housing, is of particular importance. This applies in particular to CIP cleaning, in which the cleaning medium is introduced into the pump housing with minimal dismantling or conversion work through the inlet connection, which during operation is used to supply the medium to be pumped, and with the rotor through the pump housing and the stator is conveyed through. The invention initially includes embodiments in which the inlet connection is connected to the cylindrical housing jacket centrally with respect to the longitudinal axis of the housing. However, the inlet connection is preferably connected (decentrally) offset to the longitudinal axis of the housing (essentially) tangentially to the housing jacket. It always has the geometry according to the invention to generate the flow directions explained.

Dabei hat die Erfindung erkannt, dass sich die Reinigung zwar durch einen dezentralen Anschluss des Einlassstutzens und folglich eine (im Wesentlichen) tangentiale Anordnung des Einlassstutzens optimieren lässt. Dieser grundsätzlich bekannte tangentiale Anschluss wird jedoch erfindungsgemäß weiter optimiert, und zwar durch eine Geometrie, die eine asymmetrische und bevorzugt eine "doppelt asymmetrische" Strömung bzw. Einströmung in das Pumpengehäuse und insbesondere in dem Bereich der Gleitringdichtung erzeugt. Das Reinigungsmedium strömt folglich nicht exakt tangential durch den Einlassstutzen in das Gehäuseinnere ein, sondern es erfolgt (am Übergang vom Einlassstutzen in das Gehäuseinnere) einerseits eine Umlenkung des Mediums in Richtung auf die Gehäuseaußenwand hin und folglich weg von der Gehäuselängsachse, so dass eine besonders wirksame Umspülung der in diesem Bereich bevorzugt angeordneten Gleitringdichtung erzeugt wird. Damit wird die Innenwand des Sauggehäuses besser gereinigt und die in der Praxis ggf. auftretenden Totraumgebiete unterhalb und/oder oberhalb der Gleitringdichtung werden vermieden. Bevorzugt erfolgt zusätzlich eine Ausrichtung der Einströmung, die auf die stromabgewandte Stirnfläche des Sauggehäuses und folglich auf die stirnseitige erste Öffnung des Sauggehäuses gerichtet ist, so dass dadurch die Stirnfläche des Sauggehäuses besser gereinigt und auch die Wandbereiche unterhalb der Gleitringdichtung und die Dichtstellen zwischen Gleitringdichtung und Sauggehäuse besser umspült werden.The invention has recognized that cleaning can be optimized by a decentralized connection of the inlet connection and consequently a (substantially) tangential arrangement of the inlet connection. However, this fundamentally known tangential connection is further optimized according to the invention, namely by a geometry that provides an asymmetrical and preferably a "double asymmetrical" flow or inflow into the pump housing and in particular in the area of the mechanical seal generated. The cleaning medium therefore does not flow exactly tangentially through the inlet port into the interior of the housing, but rather (at the transition from the inlet port to the interior of the housing) the medium is deflected towards the outer wall of the housing and consequently away from the longitudinal axis of the housing, so that a particularly effective Flushing around the mechanical seal preferably arranged in this area is generated. This means that the inner wall of the suction housing is cleaned better and the dead space areas that may occur in practice below and/or above the mechanical seal are avoided. Preferably, the inflow is additionally aligned, which is directed towards the end face of the suction housing facing away from the current and consequently towards the frontal first opening of the suction housing, so that the end face of the suction housing is better cleaned and also the wall areas below the mechanical seal and the sealing points between the mechanical seal and suction housing be better washed.

Die erfindungsgemäße Geometrie des Einlassstutzens lässt sich im Übrigen nicht nur bei der bevorzugten Ausführungsform realisieren, bei der der Einlassstutzen dezentral versetzt zur Gehäuselängsachse angeordnet ist, sondern bei herkömmlichen Ausführungsformen mit zentral an den Gehäusemantel angeschlossenem Einlassstutzen.The geometry of the inlet port according to the invention can also be implemented not only in the preferred embodiment, in which the inlet port is arranged decentrally offset from the longitudinal axis of the housing, but also in conventional embodiments with the inlet port connected centrally to the housing jacket.

Die Reinigung wird folglich erfindungsgemäß durch die einerseits speziell nach außen von der Gehäuselängsachse weggerichtete Strömung und andererseits durch die auf die Stirnfläche des Sauggehäuses gerichtete Strömung optimiert, und folglich durch eine spezielle radiale Richtungskomponente und/oder eine spezielle axiale Richtungskomponente der Einströmrichtung der Strömung. Diese beiden Maßnahmen können unabhängig voneinander und bevorzugt in Kombination realisiert werden. Insgesamt werden erfindungsgemäß hohe Strömungsgeschwindigkeiten bzw. hohe Geschwindigkeitsgradienten an der Wand erreicht, die zu einer erheblichen Reduzierung von Totraumgebieten und einer verbesserten Reinigung der Wandbereiche führen.The cleaning is therefore optimized according to the invention by the flow directed specifically outwards from the longitudinal axis of the housing and, on the other hand, by the flow directed towards the end face of the suction housing, and consequently by a special radial directional component and/or a special axial directional component of the inflow direction of the flow. These two measures can be implemented independently of one another and preferably in combination. Overall, according to the invention, high levels are achieved Flow velocities or high velocity gradients on the wall are achieved, which lead to a significant reduction in dead space areas and improved cleaning of the wall areas.

Die erfindungsgemäße Geometrie lässt sich in einer ersten Ausführungsform z. B. dadurch realisieren, dass sich die innere Querschnittsfläche des Einlassstutzens in Richtung zu dem Gehäusemantel hin, d. h. in der Einströmrichtung, zumindest abschnittsweise verjüngt, und zwar bevorzugt asymmetrisch und besonders bevorzugt doppelt asymmetrisch. Die Verringerung des Querschnitts führt zu einer vorteilhaften Erhöhung der Einströmgeschwindigkeit und damit zu besseren Reinigungsergebnissen. Dazu kann z. B. der Ausgangsquerschnitt des Einlassstutzens (im Bereich des Gehäusemantels) relativ zu dessen Eingansquerschnitt reduziert sein. Optional oder ergänzend ist der Ausgangsquerschnitt relativ zu dessen Eingangsquerschnitt - bezogen auf die Stutzenlängsrichtung - asymmetrisch versetzt, und zwar bevorzugt in axialer Richtung zu der ersten stirnseitigen Gehäuseöffnung hin und/oder in radialer Richtung von der Gehäuselängsachse nach außen weg bzw. zu der Gehäuseaußenwand hin versetzt. Durch den beschriebenen asymmetrischen Versatz des Ausgangsquerschnittes relativ zu dem Eingangsquerschnitt des Einlassstutzens lässt sich die erfindungsgemäße Strömung mit der erwähnten radialen Richtungskomponente und/oder der erwähnten axialen Richtungskomponente realisieren. Dabei können sowohl der Ausgangsquerschnitt als auch der Eingangsquerschnitt (in einer Draufsicht auf den Stutzen) rund ausgebildet sein, jedoch mit unterschiedlichem Durchmesser. Alternativ besteht die Möglichkeit, dass der Ausgangsquerschnitt und/oder der Eingangsquerschnitt nicht rund, sondern z. B. oval oder auch elliptisch ausgebildet sind, jedoch ebenfalls in der beschriebenen Weise mit reduziertem Ausgangsquerschnitt gegenüber dem Eingangsquerschnitt. Schließlich können auch andere Querschnittsformen realisiert werden, so dass eine individuelle Anpassung der Geometrie möglich ist. Jedenfalls erfolgt erfindungsgemäß eine gerichtete Einströmung und ggf. eine Erhöhung der Einströmgeschwindigkeit durch eine Querschnittsverjüngung.The geometry according to the invention can be used in a first embodiment, for. B. realized in that the inner cross-sectional area of the inlet connection tapers at least in sections in the direction of the housing jacket, ie in the inflow direction, preferably asymmetrically and particularly preferably doubly asymmetrically. Reducing the cross section leads to an advantageous increase in the inflow velocity and thus to better cleaning results. This can be done e.g. B. the output cross section of the inlet connection (in the area of the housing jacket) can be reduced relative to its inlet cross section. Optionally or additionally, the output cross section is asymmetrically offset relative to its input cross section - based on the longitudinal direction of the nozzle, preferably in the axial direction towards the first front-side housing opening and / or in the radial direction away from the longitudinal axis of the housing outwards or towards the outer housing wall . Due to the described asymmetrical offset of the output cross section relative to the input cross section of the inlet connection, the flow according to the invention can be realized with the mentioned radial directional component and/or the mentioned axial directional component. Both the output cross section and the input cross section (in a top view of the nozzle) can be round, but with different diameters. Alternatively, there is the possibility that the output cross section and/or the input cross section is not round, but rather z. B. are oval or elliptical, but also in the manner described with a reduced output cross section compared to the input cross section. After all, others can too Cross-sectional shapes can be realized so that individual adjustment of the geometry is possible. In any case, according to the invention, there is a directed inflow and, if necessary, an increase in the inflow velocity through a cross-sectional taper.

In einer alternativen Ausführungsform ist vorgesehen, dass der Einlassstutzen eine spiralförmig ausgebildete und damit einen spiralförmigen Strömungskanal bildende Innenwand aufweist, die wiederum eine spiralförmige Strömung innerhalb des Einlassstutzens erzeugt, so dass das Medium in der erfindungsgemäß definierten Orientierung aus dem Einlassstutzen in das Innere des Pumpengehäuses eintritt. Die erfindungswesentliche Orientierung der Strömung bzw. Einströmrichtung des Mediums wird folglich bei dieser Ausführungsform durch eine spiralförmig ausgestaltete Innenwand des Einlassstutzens realisiert.In an alternative embodiment, it is provided that the inlet port has a spiral-shaped inner wall and thus forms a spiral-shaped flow channel, which in turn generates a spiral-shaped flow within the inlet port, so that the medium enters the interior of the pump housing from the inlet port in the orientation defined according to the invention . The orientation of the flow or inflow direction of the medium, which is essential to the invention, is therefore realized in this embodiment by a spiral-shaped inner wall of the inlet connection.

Dabei besteht die Möglichkeit, dass der Einlassstutzen unmittelbar in der beschriebenen Weise geometrisch ausgestaltet ist, d. h. der Einlassstutzen selbst ist mit der beschriebenen asymmetrischen Querschnittsverjüngung oder mit der beschriebenen spiralförmigen Ausgestaltung realisiert. Das Pumpengehäuse wird folglich im Zuge der Fertigung unmittelbar mit der erfindungsgemäßen Geometrie zur Verfügung gestellt. Dabei ist das Pumpengehäuse bevorzugt aus Edelstahl gefertigt. Alternativ kann es auch aus Stahlguss gefertigt sein. Ferner kommen alternativ auch Ausführungsformen aus Kunststoff in Betracht.It is possible that the inlet connection is designed geometrically in the manner described, i.e. H. the inlet port itself is realized with the asymmetrical cross-sectional taper described or with the spiral-shaped design described. The pump housing is therefore made available directly with the geometry according to the invention during production. The pump housing is preferably made of stainless steel. Alternatively, it can also be made from cast steel. Alternatively, embodiments made of plastic can also be considered.

In einer alternativen Ausführungsform besteht jedoch auch die Möglichkeit, einen speziell ausgestalteten Stutzeneinsatz zur Verfügung zu stellen, der in einen (herkömmlichen) zylindrischen Rohrstutzen/Einlassstutzen einsetzbar ist und damit die die erfindungswesentliche Strömung erzeugende Geometrie zur Verfügung stellt. Ein solcher separat hergestellter Stutzeneinsatz kann z. B. auch im Zuge einer Nachrüstung bei einer Pumpe mit klassisch tangential angeschlossenem zylindrischen Rohrstutzen zum Einsatz kommen. Der Stutzeneinsatz kann z. B. aus Edelstahl, Stahlguss oder alternativ auch aus Kunststoff gefertigt sein.In an alternative embodiment, however, it is also possible to provide a specially designed nozzle insert that can be inserted into a (conventional) cylindrical pipe nozzle/inlet nozzle and thus provides the geometry that generates the flow essential to the invention. Such a separately manufactured nozzle insert can e.g. b. can also be used when retrofitting a pump with a classic tangentially connected cylindrical pipe socket. The nozzle insert can e.g. B. made of stainless steel, cast steel or alternatively made of plastic.

Die Erfindung betrifft im Übrigen auch eine Exzenterschneckenpumpe mit einem Pumpengehäuse der beschriebenen Art. Eine solche Exzenterschneckenpumpe weist in grundsätzlich bekannter Weise zusätzlich zu dem Pumpengehäuse/Sauggehäuse zumindest einen an die zweite stirnseitige Öffnung des Pumpengehäuses angeschlossenen Stator, einen in dem Stator angeordneten Rotor, eine in dem Pumpengehäuse angeordnete Kuppelstange und einen Antrieb auf, der über eine Verbindungswelle an die Kuppelstange angeschlossen ist. Der Antrieb treibt folglich über die Verbindungswelle die rotierende Einheit an, die aus Rotor und Kuppelstange besteht. Die Kuppelstange kann dabei z. B. in grundsätzlich bekannter Weise über Gelenke an einerseits den Rotor und andererseits die Verbindungswelle angeschlossen sein. Dabei kommen bevorzugt einfach montierbare Gelenke zur verbesserten Reinigung zum Einsatz. Optional kann in den Übergangsbereichen zwischen Verbindungswelle und Kuppelstange einerseits und Kuppelstange und Rotor andererseits auch auf klassische Gelenke verzichtet werden. In diesem Fall ist z. B. der Einsatz einer flexiblen bzw. biegeelastischen Kuppelstange möglich, z. B. aus einem Titanwerkstoff. Eine biegeelastische Kuppelstange kann auch unmittelbar einstückig an den Rotor angeschlossen sein.The invention also relates to an eccentric screw pump with a pump housing of the type described. Such an eccentric screw pump has, in a fundamentally known manner, in addition to the pump housing/suction housing, at least one stator connected to the second front opening of the pump housing, a rotor arranged in the stator, an in The coupling rod arranged in the pump housing and a drive which is connected to the coupling rod via a connecting shaft. The drive therefore drives the rotating unit, which consists of a rotor and coupling rod, via the connecting shaft. The coupling rod can z. B. be connected in a generally known manner via joints to the rotor on the one hand and the connecting shaft on the other. Easy-to-assemble joints are preferably used for improved cleaning. Optionally, classic joints can be dispensed with in the transition areas between the connecting shaft and coupling rod on the one hand and the coupling rod and rotor on the other. In this case, e.g. B. the use of a flexible or flexible coupling rod is possible, e.g. B. made of a titanium material. A flexible coupling rod can also be directly connected in one piece to the rotor.

Jedenfalls ist innerhalb des Pumpengehäuses im Bereich der (antriebsseitigen) stirnseitigen Öffnung eine Wellenabdichtung, z. B. Gleitringdichtung, für die Abdichtung des Sauggehäuses vorgesehen. Der Einlassstutzen ist im Bereich der Wellenabdichtung angeordnet, d. h. er mündet im Bereich der Wellenabdichtung in den Gehäusemantel, so dass die Wellenabdichtung von dem zu fördernden Medium, z. B. Reinigungsmedium, umspült wird.In any case, there is a shaft seal within the pump housing in the area of the (drive-side) front opening, e.g. B. mechanical seal, provided for sealing the suction housing. The inlet port is arranged in the area of the shaft seal, ie it opens into the area of the shaft seal into the housing casing, so that the shaft seal is protected from the medium to be conveyed, e.g. B. cleaning medium is washed around.

Auch wenn das Reinigungsmedium über den Einlassstutzen zugeführt wird, der im Normalbetrieb der Pumpe der Zuführung des zu fördernden Medium dient, so kann in einer möglichen Weiterbildung vorgesehen sein, dass das Pumpengehäuse bzw. die Pumpe zusätzlich ein oder mehrere Bypassöffnungen bzw. Bypassstutzen aufweist. So kann das Pumpengehäuse, das als Sauggehäuse ausgebildet ist, in der Nähe der zweiten stirnseitigen Öffnung und folglich statorseitig einen ersten Bypassstutzen aufweisen, der ebenfalls quer zur Gehäuselängsrichtung orientiert ist. An das dem Sauggehäuse gegenüberliegenden Ende des Stators ist ein weiteres Gehäuse angeschlossen, das z. B. als Druckstutzen bezeichnet wird. Dieser Druckstutzen kann einen zweiten Bypassstutzen aufweisen, der ebenfalls quer zur Gehäuselängsrichtung orientiert ist, wobei die beiden Bypassstutzen über eine Bypassleitung miteinander verbunden werden können. Ein solcher Bypass dient bei einem CIP-Betrieb dazu, überschüssiges Reinigungsmedium, das nicht durch die Statorkammern gefördert wird, von dem Sauggehäuse in das Druckgehäuse zu leiten. Wichtig ist, dass diese Bypassstutzen nicht der separaten Zuführung eines Reinigungsmediums dienen, sondern im Zuge der Reinigung durch Pumpenbetrieb mit rotierendem Rotor zum Einsatz kommen, wobei das Reinigungsmedium über den Einlassstutzen erfolgt.Even if the cleaning medium is supplied via the inlet port, which serves to supply the medium to be pumped during normal operation of the pump, it can be provided in a possible further development that the pump housing or the pump additionally has one or more bypass openings or bypass ports. The pump housing, which is designed as a suction housing, can have a first bypass connection near the second front opening and consequently on the stator side, which is also oriented transversely to the longitudinal direction of the housing. Another housing is connected to the end of the stator opposite the suction housing, which z. B. is referred to as a pressure port. This pressure port can have a second bypass port, which is also oriented transversely to the longitudinal direction of the housing, whereby the two bypass ports can be connected to one another via a bypass line. In a CIP operation, such a bypass serves to direct excess cleaning medium that is not conveyed through the stator chambers from the suction housing into the pressure housing. It is important that these bypass connections do not serve to supply a cleaning medium separately, but are used in the course of cleaning by pump operation with a rotating rotor, with the cleaning medium being supplied via the inlet connection.

Schließlich betrifft die Erfindung auch ein Verfahren zum Reinigen einer Exzenterschneckenpumpe der beschriebenen Art. Dieses Verfahren ist dadurch gekennzeichnet, dass mit dem rotierend angetriebenen Rotor ein Reinigungsmedium von dem Einlassstutzen über das Sauggehäuse durch den Stator gepumpt wird, wobei eine die Gleitringdichtung umspülende Strömung erzeugt wird, deren Einströmrichtung die in der erfindungsgemäßen Weise eine nach außen von der Gehäuselängsachse weggerichtete, radiale Richtungskomponente und/oder eine zu der ersten stirnseitigen Öffnung hingerichtete, axiale Richtungskomponente (und folglich der Hauptströmungsrichtung entgegengesetzte Richtungskomponente) aufweist.Finally, the invention also relates to a method for cleaning an eccentric screw pump of the type described. This method is characterized in that a cleaning medium is pumped from the inlet port via the suction housing through the stator with the rotatingly driven rotor, a flow flowing around the mechanical seal being generated whose inflow direction has, in the manner according to the invention, a radial directional component directed outwards from the longitudinal axis of the housing and/or an axial directional component directed towards the first front-side opening (and consequently a directional component opposite to the main flow direction).

Im Folgenden wird die Erfindung anhand von Zeichnungen erläutert, die lediglich Ausführungsbeispiele darstellen. Es zeigen:

Fig. 1
eine Exzenterschneckenpumpe in einer vereinfachten Darstellung,
Fig. 2
schematisch vereinfacht einen ersten Schnitt durch eine Exzenterschneckenpumpe im Bereich des Einlassstutzens,
Fig. 3
einen zweiten Schnitt durch den Gegenstand nach Fig. 2,
Fig. 4
eine vereinfachte Draufsicht auf den Gegenstand nach Fig. 2,
Fig. 5a bis 5d
abgewandelte Ausführungsformen des Gegenstandes nach Fig. 4,
Fig. 6
eine zweite Ausführungsform einer erfindungsgemäßen Exzenterschneckenpumpe,
Fig. 7
einen Schnitt A-A durch den Gegenstand nach Fig. 6 und
Fig. 8
einen Schnitt B-B durch den Gegenstand nach Fig. 6.
The invention is explained below with reference to drawings, which merely represent exemplary embodiments. Show it:
Fig. 1
an eccentric screw pump in a simplified representation,
Fig. 2
schematically simplified first section through an eccentric screw pump in the area of the inlet connection,
Fig. 3
make a second cut through the object Fig. 2 ,
Fig. 4
a simplified top view of the object Fig. 2 ,
Fig. 5a to 5d
modified embodiments of the object Fig. 4 ,
Fig. 6
a second embodiment of an eccentric screw pump according to the invention,
Fig. 7
a section AA through the object Fig. 6 and
Fig. 8
a cut BB through the object Fig. 6 .

In den Figuren ist vereinfacht eine Exzenterschneckenpumpe dargestellt, die in ihrem grundsätzlich Aufbau einen Stator 1, einen in dem Stator 1 rotierenden Rotor 2 und einen Antrieb 3 für den Rotor aufweist. Zum Beispiel saugseitig ist an den Stator 1 ein Pumpengehäuse 4 angeschlossen, das als Sauggehäuse 4 bezeichnet wird. Ein druckseitig an den Stator 1 angeschlossenes Gehäuseteil wird z. B. als Anschlussstutzen oder Druckstutzen 15 bezeichnet. Das Pumpengehäuse 4 weist einen sich entlang der Gehäuselängsachse L erstreckenden Gehäusemantel 5 auf, der im Ausführungsbeispiel zylindrisch ausgebildet ist, so dass die Gehäuselängsachse L die Zylinderachse L bildet.In the figures, an eccentric screw pump is shown in simplified form, which in its basic structure has a stator 1, a rotor 2 rotating in the stator 1 and a drive 3 for the rotor. For example, a pump housing 4, which is referred to as suction housing 4, is connected to the stator 1 on the suction side. A housing part connected to the stator 1 on the pressure side is z. B. referred to as a connecting piece or pressure piece 15. The pump housing 4 has a housing jacket 5 which extends along the housing longitudinal axis L and is cylindrical in the exemplary embodiment, so that the housing longitudinal axis L forms the cylinder axis L.

An den Antrieb 3 ist eine Verbindungswelle 8 angeschlossen, die über eine Kuppelstange 9 den Rotor 2 antreibt, wobei die Kuppelstange 9 die exzentrische Bewegung des Rotors 2 bzw. des Rotorendes gegenüber der zentrisch rotierenden Verbindungswelle 8 ausgleicht. Dieses ist über Gelenke oder auch über eine biegeelastische Kuppelstange möglich. Einzelheiten sind nicht dargestellt.A connecting shaft 8 is connected to the drive 3 and drives the rotor 2 via a coupling rod 9, the coupling rod 9 compensating for the eccentric movement of the rotor 2 or the rotor end relative to the centrally rotating connecting shaft 8. This is possible using joints or a flexible coupling rod. Details are not shown.

Das Pumpengehäuse 4 weist antriebsseitig eine erste stirnseitige Öffnung 6 auf, die über eine Wellenabdichtung 7 für die Verbindungswelle 8 abgedichtet ist. Ferner weist das Pumpengehäuse 4 statorseitig eine zweite stirnseitige Öffnung 10 auf, an die der Stator 1 angeschlossen ist. Außerdem weist das Pumpengehäuse 4 für die Zuführung des zu fördernden Mediums einen rohrförmigen Einlassstutzen 11 auf, der quer zur Gehäuselängsachse bzw. Zylinderachse L orientiert und an den Gehäusemantel 5 angeschlossen ist. Dabei ist dieser Einlassstutzen 11 dezentral und folglich versetzt zu der Gehäuselängsachse L in im Wesentlichen tangentialer Orientierung an den Gehäusemantel 5 angeschlossen.The pump housing 4 has a first front opening 6 on the drive side, which is sealed via a shaft seal 7 for the connecting shaft 8. Furthermore, the pump housing 4 has a second front opening 10 on the stator side, to which the stator 1 is connected. In addition, the pump housing 4 has a tubular inlet connection 11 for supplying the medium to be pumped, which is oriented transversely to the longitudinal axis of the housing or cylinder axis L and is connected to the housing jacket 5. This inlet connection 11 is connected to the housing jacket 5 in a decentralized manner and consequently offset from the longitudinal axis L of the housing in a substantially tangential orientation.

Über den Einlassstutzen 11 wird im Normalbetrieb das zu fördernde Medium zugeführt und über das Sauggehäuse 4 bzw. dessen zweite Öffnung 10 durch den Stator 1 in den Bereich des Druckstutzens 15 gepumpt. Zum Zwecke der Reinigung der Pumpe wird über den Einlassstutzen 11 im Reinigungsbetrieb ein Reinigungsmedium zugeführt, welches ebenfalls im Betrieb der Pumpe durch den rotierenden Rotor 2 gefördert wird. Das Reinigungsmedium kann aber auch mit einer separat angeschlossenen Reinigungspumpe durch die dargestellte Pumpe gefördert werden. Der bereits erwähnte dezentrale, tangentiale Anschluss des Einlassstutzens 11 an den Gehäusemantel 5 führt zu einer optimierten Umspülung der Gleitringdichtung 7 und damit zu einer verbesserten Reinigung der Bereiche unterhalb und/oder oberhalb der Gleitringdichtung 7. Erfindungsgemäß ist die Geometrie des Einlassstutzens nun nicht nur tangential ausgestaltet, sondern sie ist derart ausgestaltet, dass im Zuge des Einströmens des Mediums bzw. Reinigungsmediums durch den Einlassstutzen 11 in das Gehäuseinnere eine Strömung erzeugt wird, die eine Einströmrichtung R aufweist, die eine nach außen von der Gehäuselängsache L weggerichtete, radiale Richtungskomponente R1 und außerdem eine zu der ersten stirnseitigen Öffnung 6 hingerichtete, axiale Richtungskomponente R2 aufweist. Dazu wird auf die Fig. 2 und 3 verwiesen. Die Einströmrichtung R ist die Richtung der Strömung S des Mediums im Bereich des Übergangs vom Einlassstutzen 11 in das Gehäuseinnere bzw. an den Gehäusemantel 5.During normal operation, the medium to be conveyed is supplied via the inlet connection 11 and pumped via the suction housing 4 or its second opening 10 through the stator 1 into the area of the pressure connection 15. For the purpose of cleaning the pump, a cleaning medium is supplied via the inlet connection 11 during cleaning operation, which is also conveyed by the rotating rotor 2 during operation of the pump. The cleaning medium can also be conveyed through the pump shown using a separately connected cleaning pump. The already mentioned decentralized, tangential connection of the inlet connection 11 to the housing jacket 5 leads to an optimized flushing around the mechanical seal 7 and thus to improved cleaning of the areas below and / or above the mechanical seal 7. According to the invention, the geometry of the inlet connection is now not only tangential , but it is designed in such a way that in the course of the medium or cleaning medium flowing in through the inlet connection 11 into the interior of the housing, a flow is generated which has an inflow direction R, which has a radial directional component R1 directed outwards from the longitudinal axis L of the housing and also has an axial directional component R2 directed towards the first front opening 6. This is done on the Fig. 2 and 3 referred. The inflow direction R is the direction of the flow S of the medium in the area of the transition from the inlet connection 11 into the interior of the housing or onto the housing jacket 5.

In Fig. 3 ist erkennbar, dass eben keine exakt tangentiale Einströmung realisiert wird bzw. dass die Einströmrichtung R nicht exakt tangential bezogen auf den Umfang des Gehäusemantels 5 orientiert ist, sondern dass eine nach außen von der Gehäuselängsachse L weggerichtete Strömung erzeugt wird, d. h. die Strömung hat eine radial nach außen von der Gehäuselängsachse weggerichtete Richtungskomponente R1. Dabei ist in Fig. 3 dargestellt, dass die Einströmrichtung R gegenüber der herkömmlichen tangentialen (bzw. vertikalen) Ausrichtung N nach außen weggerichtet ist, so dass sich die radiale Richtungskomponente R1 ergibt. Diese nach außen weggerichtete bzw. auf die Innenseite des Gehäusemantels hingerichtete Strömungsrichtung R der Strömung S führt zu einer verbesserten Umspülung der Gleitringdichtung 7 und damit zu einer verbesserten Reinigung Innenwand des Gehäusemantels 5. Außerdem werden Totraumgebiete unterhalb und oberhalb der Gleitringdichtung 7 vermieden.In Fig. 3 It can be seen that no exactly tangential inflow is realized or that the inflow direction R is not oriented exactly tangentially with respect to the circumference of the housing jacket 5, but that a flow directed outwards away from the housing longitudinal axis L is generated, ie the flow has a radial flow Directional component R1 directed outwards from the longitudinal axis of the housing. This is in Fig. 3 shown that the Inflow direction R is directed away from the conventional tangential (or vertical) orientation N, so that the radial directional component R1 results. This flow direction R of the flow S, which is directed away from the outside or towards the inside of the housing jacket, leads to an improved flushing around the mechanical seal 7 and thus to an improved cleaning of the inner wall of the housing jacket 5. In addition, dead space areas below and above the mechanical seal 7 are avoided.

Zusätzlich wird bei der erfindungsgemäßen Ausführungsform eine zu der stirnseitigen Öffnung 6 hingerichtete und folglich der Hauptströmungsrichtung H im Gehäuse entgegengesetzte Strömung S erzeugt. Dazu wird auf Fig. 2 verwiesen und diese zeigt, dass die Strömung S bzw. Einströmrichtung R eine zu der ersten stirnseitigen Öffnung 6 hingerichtete, axiale Richtungskomponente R2 aufweist die folglich der Hauptströmrichtung H der Pumpe entgegengesetzt ist. Auch in Fig. 2 ist dabei die herkömmliche Orientierung mit dem Bezugszeichen N angedeutet, so dass erkennbar ist, dass die Einströmrichtung R gegenüber dieser herkömmlichen, vertikalen Richtung N auf die Stirnfläche des Sauggehäuses 4 hin ausgerichtet ist. Damit ergibt sich die in Fig. 2 dargestellte axiale Richtungskomponente R2. Diese Umlenkung der Strömung S in axialer Richtung gegen die Gleitringdichtung 7 führt zu einer verbesserten Reinigung der stromabgewandten Stirnfläche des Sauggehäuses 4. Außerdem werden auch dadurch die Wandbereiche unterhalb und/oder oberhalb der Gleitringdichtung 7 besser umspült.In addition, in the embodiment according to the invention, a flow S is generated which is directed towards the front opening 6 and is therefore opposite to the main flow direction H in the housing. This will be done on Fig. 2 referenced and this shows that the flow S or inflow direction R has an axial directional component R2 directed towards the first front opening 6, which is therefore opposite to the main flow direction H of the pump. Also in Fig. 2 The conventional orientation is indicated by the reference number N, so that it can be seen that the inflow direction R is aligned with respect to this conventional, vertical direction N towards the end face of the suction housing 4. This results in the in Fig. 2 shown axial directional component R2. This deflection of the flow S in the axial direction against the mechanical seal 7 leads to improved cleaning of the end face of the suction housing 4 facing away from the current. In addition, the wall areas below and/or above the mechanical seal 7 are also better washed.

Bei dem Ausführungsbeispiel bei den Fig. 2 bis 4 wird diese erfindungsgemäße Geometrie dadurch realisiert, dass sich die innere Querschnittfläche des Einlassstutzens 11 in Richtung zu dem Gehäusemantel 5 hin asymmetrisch verjüngt. Das bedeutet, dass der Ausgangsquerschnitt 11a des Einlassstutzens 11 in einer Draufsicht relativ zu dessen Eingangsquerschnitt 11b reduziert ist und darüber hinaus bezogen auf die Stutzenlängsrichtung asymmetrisch versetzt ist. In dem dargestellten Ausführungsbeispiel ist der Ausgangsquerschnitt 11a sowohl in axialer Richtung zu der ersten stirnseitigen Gehäuseöffnung 6 hin als auch in radialer Richtung von der Gehäuselängsachse L nach außen weg versetzt (vgl. Fig. 4). Dadurch werden die beschriebenen vorteilhaften Strömungsverhältnisse erzeugt.In the exemplary embodiment at the Fig. 2 to 4 This geometry according to the invention is realized in that the inner cross-sectional area of the inlet connection 11 tapers asymmetrically towards the housing jacket 5. This means that the output cross section 11a of the inlet nozzle 11 is reduced in a plan view relative to its input cross section 11b and is also asymmetrically offset with respect to the longitudinal direction of the nozzle. In the exemplary embodiment shown, the initial cross section 11a is offset both in the axial direction towards the first front housing opening 6 and in the radial direction outwards from the longitudinal axis L of the housing (cf. Fig. 4 ). This creates the advantageous flow conditions described.

Die Fig. 5a, 5b, 5c und 5d zeigen Abwandlungen der Ausführungsform nach Fig. 4. Fig. 5a zeigt eine Ausführungsform, bei der der Einlassstutzen gegenüber Fig. 4 auf der anderen Seite des Gehäuses bezogen auf die Längsachse L angeschlossen ist, so dass die Ausführungsform nach Fig. 5a bevorzugt für eine gegenüber Fig. 4 umgekehrte Drehrichtung der Pumpe eingesetzt wird. Die Ausführungsform nach Fig. 5b unterscheidet sich von der nach 5a insbesondere durch eine andere Dimensionierung der Querschnittsverjüngung. Während die Fig. 4, 5a und 5b Ausführungsformen mit runden Querschnitten zeigen, zeigt Fig. 5c eine abgewandelte Ausführungsform mit einem nicht runden Querschnitt, z. B. einem ovalen oder elliptischen Querschnitt. Fig. 5d zeigt eine optionale Ausgestaltung mit einem variabel angepassten Querschnitt des Einlassstutzens.The Figs. 5a, 5b, 5c and 5d show modifications of the embodiment Fig. 4 . Fig. 5a shows an embodiment in which the inlet port opposite Fig. 4 on the other side of the housing relative to the longitudinal axis L is connected, so that the embodiment according to Fig. 5a preferred for one opposite Fig. 4 reverse direction of rotation of the pump is used. The embodiment according to Fig. 5b differs from that according to 5a in particular by a different dimensioning of the cross-sectional taper. While the Fig. 4 , 5a and 5b Show embodiments with round cross sections Fig. 5c a modified embodiment with a non-round cross section, e.g. B. an oval or elliptical cross section. Fig. 5d shows an optional embodiment with a variably adapted cross section of the inlet connection.

Die Fig. 6 bis 8 zeigen eine abgewandelte Ausführungsform der Erfindung, bei der die erfindungsgemäße asymmetrische Strömung S bzw. R durch einen speziellen Einlassstutzen 11 erzeugt wird, der eine spiralförmig ausgebildete Innenwand aufweist, die einen spiralförmigen Strömungskanal 14 bildet, so dass innerhalb des Einlassstutzens 11 eine spiralförmige Strömung erzeugt wird, die in der beschriebenen Weise mit radialer Richtungskomponente R1 und axialer Richtungskomponente R2 in das Gehäuseinnere eintritt. Auch durch diese Ausführungsform lässt sich folglich die erfindungswesentliche Einströmung zur verbesserten Reinigung realisieren.The Fig. 6 to 8 show a modified embodiment of the invention, in which the asymmetrical flow S or R according to the invention is generated by a special inlet port 11, which has a spiral-shaped inner wall which forms a spiral-shaped flow channel 14, so that a spiral-shaped flow is generated within the inlet port 11 , in the manner described with radial directional components R1 and axial directional component R2 enters the interior of the housing. This embodiment also makes it possible to realize the inflow essential to the invention for improved cleaning.

Darüber hinaus sind bei der Ausführungsform nach den Fig. 6 bis 8 zwei Bypassstutzen 12, 13 vorgesehen, die mit einer nicht dargestellten Bypassleitung miteinander verbunden werden können. Der erste Bypassstutzen 12 ist an das Sauggehäuse 4 angeschlossen, und zwar in der Nähe der zweiten stirnseitigen Öffnung 10 des Sauggehäuses 4. Der zweite Bypassstutzen 13 ist an den Druckstutzen 15 angeschlossen. Das Reinigungsmedium wird zur Reinigung der Pumpe auch bei der Ausführungsform nach Fig. 6 bis 8 über den Einlassstutzen 11 zugeführt und im Betrieb der Pumpe mittels des Rotors 2 durch die Pumpe hindurchgefördert. Dabei kann jedoch das Reinigungsmedium über den zweiten Bypassstutzen 13 und die nicht dargestellte Bypassleitung zu dem ersten Bypassstutzen 12 zurückgefördert und damit eine besonders effiziente Reinigung der Pumpe und insbesondere des Stators realisiert werden. Diese Ausgestaltung mit Bypassstutzen lässt sich in gleicher Weise bei der Ausführungsform nach den Fig. 1 bis 5 realisieren, d. h. ein Bypassstutzen 12, 13 oder beide Bypassstutzen 12, 13 können geometrisch so ausgebildet sein, wie es im Zusammenhang mit dem Einlassstutzen 11 beschrieben ist. Die in der Beschreibung und in den Patentansprüchen erläuterte geometrische Ausgestaltung des Einlassstutzens 11 bezieht sich folglich in optionaler Weiterbildung der Erfindung auch auf einen oder mehrere ggf. vorgesehene Bypassstutzen.In addition, in the embodiment according to the Fig. 6 to 8 two bypass connections 12, 13 are provided, which can be connected to one another with a bypass line, not shown. The first bypass connection 12 is connected to the suction housing 4, specifically in the vicinity of the second front opening 10 of the suction housing 4. The second bypass connection 13 is connected to the pressure connection 15. The cleaning medium is also used to clean the pump in the embodiment Fig. 6 to 8 supplied via the inlet connection 11 and conveyed through the pump by means of the rotor 2 during operation of the pump. However, the cleaning medium can be conveyed back to the first bypass connection 12 via the second bypass connection 13 and the bypass line, not shown, and thus a particularly efficient cleaning of the pump and in particular the stator can be achieved. This configuration with bypass connection can be used in the same way in the embodiment according to Fig. 1 to 5 realize, ie one bypass port 12, 13 or both bypass ports 12, 13 can be designed geometrically as described in connection with the inlet port 11. The geometric design of the inlet port 11 explained in the description and in the patent claims therefore also refers, in an optional development of the invention, to one or more bypass ports that may be provided.

Im Übrigen ist in den Fig. 6 bis 8 beispielhaft dargestellt, dass das Pumpengehäuse bzw. Sauggehäuse 4 mehrteilig, z. B. zweiteilig ausgebildet sein kann und dazu zwei in axialer Richtung hintereinander angeordnete Gehäuseabschnitte 4a, 4b aufweisen kann.Incidentally, in the Fig. 6 to 8 shown as an example that the pump housing or suction housing 4 is made up of several parts, e.g. B. can be designed in two parts and can have two housing sections 4a, 4b arranged one behind the other in the axial direction.

In der Erfindung ist im Übrigen lediglich eine Ausführungsform dargestellt, in der der Einlassstutzen 11 dezentral gegenüber der Längsachse L der Pumpe versetzt angeordnet ist. Die erfindungsgemäße Geometrie des Einlassstutzens 11 lässt sich jedoch auch bei einer nicht dargestellten Variante realisieren, bei der der Einlassstutzen zentral bezogen auf die Längsachse L orientiert ist. Auch bei einer solchen Ausführungsform kann z. B. die in den Figuren dargestellte Querschnittsverjüngung realisiert sein. Gleiches gilt für die Möglichkeit eines spiralförmig ausgebildeten Strömungskanals.Incidentally, the invention only shows one embodiment in which the inlet connection 11 is arranged offset decentrally relative to the longitudinal axis L of the pump. However, the geometry of the inlet connection 11 according to the invention can also be implemented in a variant, not shown, in which the inlet connection is oriented centrally with respect to the longitudinal axis L. Even in such an embodiment z. B. the cross-sectional taper shown in the figures can be realized. The same applies to the possibility of a spiral-shaped flow channel.

Claims (12)

  1. A pump housing (4) for a progressive cavity pump,
    having a housing casing (5), which extends along a housing longitudinal axis (L),
    having a first end-side opening (6), to which a shaft seal (7) for a connecting shaft (8) can be connected, and having a second end-side opening (10), to which a stator (1) can be connected, and
    having a tubular inlet connecting piece (11), which is orientated transversely to the housing longitudinal axis (L), for supplying a medium to be conveyed,
    the geometry of the inlet connecting piece (11) being configured in such a manner that a flow (S) is generated in the course of the inflow of the medium through the inlet connecting piece (11) into the housing interior, which flow has an inflow direction (R) with a radial directional component (R1), which is directed outwardly away from the housing longitudinal axis (L), and an axial directional component (R2), which is directed towards the first end-side opening (6),
    characterized
    in that the inner cross-sectional area of the inlet connecting piece (11) tapers at least in sections in the direction towards the housing casing (5), wherein the outlet cross section (11a) of the inlet connecting piece (11) is reduced and asymmetrically offset relative to the inlet cross section (11b) thereof,
    or
    in that the inlet connecting piece (11) has an inner wall, which is constructed in a spiral manner and forms a spiral flow channel (14) and which generates a spiral flow.
  2. The pump housing according to Claim 1, characterized in that the housing casing (5) is constructed in a substantially cylindrical manner at least in the region of the inlet connecting piece (11).
  3. The pump housing according to Claim 1 or 2, characterized in that the outlet cross section (11a) of the inlet connecting piece (11) is offset relative to the inlet cross section (11b) thereof in the axial direction towards the first end-side housing opening and/or in the radial direction outwardly away from the housing longitudinal axis.
  4. The pump housing according to one of Claims 1 to 3, characterized in that the inlet connecting piece (11) is tangentially connected to the housing casing (5) in an offset manner with respect to the housing longitudinal axis (L).
  5. The pump housing according to one of Claims 1 to 4, characterized in that the pump housing (4) is designed as a divided housing with two housing sections (4a, 4b), which are arranged one behind the other in the axial direction.
  6. The pump housing according to one of Claims 1 to 5, characterized in that the pump housing (4) additionally has a first bypass connecting piece (12), which is orientated transversely to the housing longitudinal direction (L), in the region assigned to the second end-side opening (10).
  7. The pump housing according to one of Claims 1 to 6, characterized in that the inlet connecting piece (11) has a symmetrical pipe socket connected to the housing casing (5), into which pipe socket an asymmetrically designed connecting piece insert is inserted with the formation of the geometry which generates the flow.
  8. The pump housing according to Claim 7, characterized in that the connecting piece insert is inserted into the pipe socket in a detachable manner.
  9. A progressive cavity pump, having a pump housing (4) according to one of Claims 1 to 8 and having at least
    - a stator (1) connected to the second end-side opening (10),
    - a rotor (2) arranged in the stator (1),
    - a coupling rod (9) arranged in the pump housing (4),
    - a drive (3), which is connected to the coupling rod (9) by means of a connecting shaft (8),
    - a shaft seal (7) for the connecting shaft (8), which seal is arranged in the pump housing (4) at least in some regions and is connected to the first end-side opening (6),
    characterized in that the inlet connecting piece (11) opens into the housing casing (5) in the region of the shaft seal (7), so the medium to be conveyed washes around the shaft seal (7) with a flow which has an inflow direction with a radial directional component, which is directed outwardly away from the housing longitudinal axis (L), and an axial directional component, which is directed towards the first end-side openings.
  10. The progressive cavity pump according to Claim 9, characterized in that the shaft seal (7) is constructed as an end-face mechanical seal.
  11. The progressive cavity pump according to Claim 9 or 10, characterized in that the pump housing (4) additionally has a first bypass connecting piece (12), which is orientated transversely to the housing longitudinal direction (L), in the region assigned to the second end-side opening (10) and in that a pressure connecting piece (15) is connected to the end of the stator (1) opposite the pump housing (4), which pressure connecting piece has a second bypass connecting piece (13), which is orientated transversely to the housing longitudinal direction, wherein the medium to be conveyed can be recirculated from the stator outlet to the stator inlet via a bypass line arranged between the bypass connecting pieces (12, 13).
  12. A method for cleaning a progressive cavity pump according to Claim 11, characterized in that a cleaning agent is pumped from the inlet connecting piece (11) through the pump housing (4) and the stator (1) using the rotor (2), which is driven in a rotating manner, wherein a flow is generated which washes around the end-face mechanical seal, which flow has an inflow direction with a radial directional component (R1), which is directed outwardly away from the housing longitudinal axis (L), and/or an axial directional component, which is directed towards the first end-side opening.
EP19718682.8A 2018-07-18 2019-04-17 Pump housing Active EP3824162B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018117374.1A DE102018117374A1 (en) 2018-07-18 2018-07-18 pump housing
PCT/EP2019/059925 WO2020015873A1 (en) 2018-07-18 2019-04-17 Pump housing

Publications (2)

Publication Number Publication Date
EP3824162A1 EP3824162A1 (en) 2021-05-26
EP3824162B1 true EP3824162B1 (en) 2023-10-04

Family

ID=66240137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19718682.8A Active EP3824162B1 (en) 2018-07-18 2019-04-17 Pump housing

Country Status (4)

Country Link
US (1) US11441560B2 (en)
EP (1) EP3824162B1 (en)
DE (1) DE102018117374A1 (en)
WO (1) WO2020015873A1 (en)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE370281C (en) * 1923-03-01 Fried Krupp Akt Ges Storage of a screw for conveying bulk goods, in particular garbage o.
DE8212381U1 (en) * 1982-04-29 1989-11-23 Armatec Fts-Armaturen Gmbh & Co Kg, 7988 Wangen, De
SE459877B (en) * 1983-09-16 1989-08-14 Hans Baeckstroem DEVICE FOR THE TRANSPORT OF PAST PROTECTIVE DRUGS WITH THE PUMP PROTECTOR OF A ROTATING DEPLACEMENT TYPE
DE3818508A1 (en) * 1988-05-31 1989-12-07 Netzsch Mohnopumpen Gmbh Sterilisable model of an eccentric screw pump
DE29715797U1 (en) 1997-09-03 1998-01-08 Wangen Pumpen Suction housing for eccentric screw pumps with tangential cleaning / inspection openings for generating turbulent pipe flows for cleaning purposes
DE19812154A1 (en) * 1998-03-20 1999-09-23 Reburg Patentverwertungs Gmbh Mixing and conveying apparatus used e.g. for mixing and conveying mortar mixtures
JP3891924B2 (en) * 2002-01-11 2007-03-14 泰 小林 Liquid dispenser in liquid container
EP1970569A1 (en) 2007-03-16 2008-09-17 Knoll Maschinenbau Gmbh Eccentric screw pump with pump casing
DE102010034032B4 (en) * 2010-08-11 2013-02-07 M-Tec Mathis Technik Gmbh Pump for conveying setting material
DE102012001617A1 (en) 2012-01-30 2013-08-01 Netzsch Pumpen & Systeme Gmbh Conveying device e.g. spindle pump, for conveying e.g. fluid in food industry, has reservoir, inlet, outlet, rotor and stator, where reservoir is designed recess- and/or projection-free manner, and sealing unit cooled by washable mediums
DE102013111716B3 (en) * 2013-10-24 2015-03-19 Netzsch Pumpen & Systeme Gmbh Eccentric screw pump and use of an eccentric screw pump

Also Published As

Publication number Publication date
WO2020015873A1 (en) 2020-01-23
DE102018117374A1 (en) 2020-01-23
US11441560B2 (en) 2022-09-13
US20210140428A1 (en) 2021-05-13
EP3824162A1 (en) 2021-05-26

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