EP3824162A1 - Pump housing - Google Patents

Pump housing

Info

Publication number
EP3824162A1
EP3824162A1 EP19718682.8A EP19718682A EP3824162A1 EP 3824162 A1 EP3824162 A1 EP 3824162A1 EP 19718682 A EP19718682 A EP 19718682A EP 3824162 A1 EP3824162 A1 EP 3824162A1
Authority
EP
European Patent Office
Prior art keywords
housing
pump
pump housing
longitudinal axis
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.)
Granted
Application number
EP19718682.8A
Other languages
German (de)
French (fr)
Other versions
EP3824162B1 (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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seepex GmbH filed Critical Seepex GmbH
Publication of EP3824162A1 publication Critical patent/EP3824162A1/en
Application granted granted Critical
Publication of EP3824162B1 publication Critical patent/EP3824162B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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 pump housing has a tubular inlet connection oriented transversely to the longitudinal axis of the housing for the supply of a medium to be conveyed (with the pump).
  • the invention 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, which is also referred to as a suction housing, being connected to the stator on the suction side.
  • 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 rotor end with respect to the connecting shaft.
  • a shaft seal is provided for liquid-tight sealing of the pump housing from the environment.
  • B. can be designed as a mechanical seal.
  • the housing shell of the pump housing or of the suction housing is preferably cylindrical, at least in regions (essentially), and preferably at least in the region of the inlet connector. In this case, the
  • Such an eccentric screw pump is a pump from the group of rotating positive-displacement pumps, which are used to convey a wide variety of media and in particular highly viscous liquids in a wide variety of industrial sectors.
  • the liquids to be pumped can, for. 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 consequently preferably for the conveyance of 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, cosmetic and chemical industries. Such pumps follow high hygiene regulations.
  • a cleaning medium can be pumped through the pump using the operated pump or a separately connected cleaning pump, thereby cleaning the pump and the suction housing.
  • the cleaning medium is consequently supplied through the inlet connection, which also serves to supply the medium to be conveyed during normal operation of the pump, and is conveyed with the rotor through the suction housing and the stator into the region of the pressure connection connected to the stator on the pressure side.
  • CIP clean-in-place flushing
  • the shaft seal eg mechanical seal
  • the inlet connections are connected centrally and consequently in a radial orientation to the cylindrical housing jacket, generally in the area of the mechanical seal, which, for. B. is arranged in the vicinity of the first end opening of the suction housing.
  • the cleaning liquid flowing in through the central inlet connection is divided up when it hits the mechanical seal, so that cleaning liquid also gets into the area below the mechanical seal. Nonetheless, problems can arise during cleaning due to the division due to insufficient underflow of the mechanical seal. The division of the flow can also lead to a stagnation point above the mechanical seal and this can lead to cleaning problems above the mechanical seal.
  • the inlet connector is not centrally / radially oriented, but is connected tangentially to the housing jacket, so that it is not a divided flow, but a continuous flow on one side that flows around the mechanical seal.
  • a housing geometry of a pump housing for an eccentric screw pump is, for. B. is described in DE 10 2008 014 235 A1.
  • DE 292 15 797 U1 a suction housing of an eccentric screw pump of a special design is known.
  • the suction housing has an inlet connection for the medium to be conveyed which is connected to the housing jacket in the radial direction. Additional pipe sockets are for cleaning purposes
  • the cleaning is not carried out via the inlet connection, so that the cleaning medium is not conveyed through the pump even when the pump is operating, but the cleaning medium is conveyed through the special cleaning connection in a special cleaning operation when the rotor is at a standstill.
  • An eccentric screw pump of the usual type is e.g. B. also known from DE 10 2012 001 617 A1.
  • the inlet is connected radially to the housing casing in a conventional manner, specifically in the area of the mechanical seal.
  • the pump is provided with a storage space in the region of the transition to the stator, the storage space being designed to be free of recesses and / or bulges, as a result of which very good cleanability and hygiene are to be achieved, particularly 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 at the outset, which is simple in design with optimized cleaning options distinguished.
  • the invention teaches in the case of a generic pump housing of the type described in the introduction that the geometry of the inlet connection (including its orientation) is designed such that a flow as the medium flows through the inlet connection into the interior of the housing is generated (in the transition between inlet
  • connecting piece and housing shell has an inflow direction which has a radial directional component which is directed outward from the longitudinal axis of the housing and / or an axial directional component which is oriented toward the first end-side (drive-side opening).
  • the invention is based on the knowledge that, in the case of 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 a CIP cleaning, in which the cleaning medium is inserted into the pump housing with minimal disassembly or retrofitting work through the inlet connection, which in operation serves to supply the medium to be pumped, and with the rotor through the Pump housing and the stator is conveyed through.
  • the invention first of all comprises embodiments in which the inlet connector is connected to the cylindrical housing jacket centrally with respect to the longitudinal axis of the housing. Preferably, however, the inlet connection is (decentrally) connected tangentially to the housing jacket (essentially) offset to the longitudinal axis of the housing. It always has the geometry according to the invention for generating the flow directions explained.
  • the invention has recognized that cleaning can be optimized by a decentralized connection of the inlet connector and consequently a (substantially) tangential arrangement of the inlet connector.
  • This basically known tangential connection is, however, further optimized according to the invention, namely by a geometry that has an asymmetrical and preferably a “double asymmetrical” flow or inflow into the pump housing and in particular in the area of the mechanical seal
  • the cleaning medium consequently does not flow exactly tangentially through the inlet connector into the interior of the housing, but instead (at the transition from the inlet connector into 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, making it particularly effective Rinsing of the mechanical seal preferably arranged in this area is generated. In this way, the inner wall of the suction housing is cleaned better and the dead space areas below and / or above the mechanical seal that may occur in practice are avoided.
  • the geometry of the inlet connector according to the invention can moreover not only be implemented in the preferred embodiment in which the inlet connector is arranged decentrally offset from the longitudinal axis of the housing, but in conventional embodiments with an inlet connector centrally connected to the housing jacket.
  • the cleaning is consequently optimized according to the invention by the flow, on the one hand, specifically directed outward from the longitudinal axis of the housing and, on the other hand, by the flow directed at the end face of the suction housing, and consequently by a special radial direction component and / or a special axial direction component of the inflow direction of the flow.
  • the geometry according to the invention can in a first embodiment, for.
  • This can be achieved, for example, by the inner cross-sectional area of the inlet connector tapering at least in sections in the direction of the housing shell, ie in the inflow direction, preferably asymmetrically and particularly preferably double asymmetrically.
  • the reduction in the cross section leads to an advantageous increase in the inflow speed and thus to better cleaning results.
  • the outlet cross-section of the inlet connector in the area of the housing shell
  • the output cross-section is asymmetrically offset relative to its input cross-section, with respect to the longitudinal direction of the connecting piece, and 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 to the outside or to the outer wall of the housing moved there.
  • the output cross section and / or the input cross section is not round, but 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 are realized so that an individual adjustment of the geometry is possible.
  • the inlet connector has an inner wall which is of spiral form and thus forms a spiral flow channel and which in turn generates a spiral flow within the inlet connector, so that the medium in the orientation defined according to the invention from the inlet connector to the interior of the Pump housing enters.
  • the orientation of the flow or inflow direction of the medium which is essential to the invention, is consequently realized in this embodiment by a spiral-shaped inner wall of the inlet connector.
  • the inlet connector is directly geometrically designed in the manner described, i. H. the inlet connector itself is realized with the asymmetrical cross-sectional taper described or with the spiral configuration described.
  • the pump housing is consequently made available directly with the geometry according to the invention in the course of production.
  • the pump housing is preferably made of stainless steel. Alternatively, it can also be made of cast steel. In addition, embodiments made of plastic can also be considered as an alternative.
  • the nozzle insert can, for. B. made of stainless steel, cast steel or alternatively also made of plastic.
  • the invention also relates to an eccentric screw pump with a pump housing of the type described.
  • an eccentric screw pump has, 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, a coupling rod arranged in the pump housing and a drive which is connected to the coupling rod via a connecting shaft.
  • the drive consequently drives the rotating unit, which consists of the rotor and coupling rod, via the connecting shaft.
  • the coupling rod can z. B. in a generally known manner via joints on the one hand the rotor and on the other hand the connecting shaft. Easily mountable joints are preferred for improved cleaning.
  • classic joints can also be dispensed with in the transition areas between the connecting shaft and coupling rod on the one hand and coupling rod and rotor on the other.
  • a flexible or flexible coupling rod possible, for. B. made of a titanium material.
  • a flexible coupling rod can also be directly connected in one piece to the rotor.
  • a shaft seal e.g. B. Mechanical seal, provided for the sealing of the suction housing.
  • the inlet connector is arranged in the area of the shaft seal, ie it opens in the area of the shaft seal.
  • the pump housing or the pump additionally has one or more bypass openings or bypass connections .
  • the pump housing which is designed as a suction housing, can have a first bypass connection near the second end 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. B. is referred to as a pressure port.
  • This pressure connector can have a second bypass connector, which is also oriented transversely to the longitudinal direction of the housing, the two bypass connectors being able to be connected to one another via a bypass line.
  • bypass serves to guide excess cleaning medium, which is not conveyed through the stator chambers, from the suction housing into the pressure housing. It is important that these bypass nozzles do not serve the separate supply of a cleaning medium, but are used in the course of cleaning by pump operation with a rotating rotor, the cleaning medium being carried out via the inlet nozzle.
  • the invention also relates to a method for cleaning an eccentric screw pump of the type described.
  • This method is characterized in that, with the rotatingly driven rotor, a cleaning medium is pumped through the stator from the inlet nozzle via the suction housing, one washing around the mechanical seal Flow generated
  • FIG. 2 schematically simplified a first section through an eccentric screw pump in the area of the inlet connector, FIG. 3 a second section through the object according to FIG. 2,
  • FIG. 4 shows a simplified top view of the object according to FIG. 2,
  • FIG. 6 shows a second embodiment of an eccentric screw pump according to the invention
  • FIG. 7 shows a section A-A through the object according to FIGS. 6 and
  • FIG. 8 shows a section BB through the object according to FIG. 6.
  • an eccentric screw pump is shown in simplified form, which basically 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 a suction housing 4, is connected to the stator 1 on the suction side.
  • a housing part connected on the pressure side to the stator 1 is, for. B. referred to as a connecting piece or pressure port 15.
  • the pump housing 4 has a housing jacket 5 which extends along the longitudinal axis L of the housing and which is cylindrical in the exemplary embodiment, so that the longitudinal axis L of the housing forms the cylinder axis L.
  • connection shaft 8 is connected to the drive 3, which 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 with respect to the centrically rotating connection shaft 8. This is possible via joints or a flexible coupling rod. Details are not shown.
  • the pump housing 4 has a first end 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 end 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 conveyed, which is oriented transversely to the longitudinal axis of the housing or the cylinder axis L and is connected to the housing jacket 5. This inlet connection 11 is decentralized and consequently offset to the housing longitudinal axis L in a substantially tangential orientation to the housing jacket 5.
  • the medium to be pumped is supplied via the inlet connection 11 and pumped through the stator 1 into the region of the pressure connection 15 via the suction housing 4 or its second opening 10.
  • a cleaning medium is supplied via the inlet connection 11 in the cleaning mode, which is also conveyed by the rotating rotor 2 when the pump is operating.
  • the cleaning medium can also be pumped through the pump shown with a separately connected cleaning pump.
  • the already mentioned decentralized, tangential connection of the inlet connector 11 to the housing jacket 5 leads to an optimized washing around the mechanical seal 7 and thus to an improved cleaning of the areas below and / or above the mechanical seal 7.
  • the geometry of the inlet connector is now not only tangent tially designed, but it is designed such that in the course of the inflow of the medium or cleaning medium through the inlet port 11 into the interior of the housing, a flow is generated which has an inflow direction R, which is directed outward from the longitudinal housing L , radial directional component R1 and also has an axial directional component R2 which is executed towards the first end opening 6.
  • the inflow direction R is the direction of the flow S of the medium in the region of the transition from the inlet connection 11 into the housing interior or to the housing jacket 5.
  • the inflow direction R is directed outward relative to the conventional tangential (or vertical) orientation N, so that the radial direction component R1 results.
  • This outward flow direction R of the flow S which is directed towards the inside of the housing shell, leads to improved washing around the mechanical seal 7 and thus to an improved cleaning of the inner wall of the housing shell 5. In addition, dead space areas below and above the mechanical seal 7 are avoided.
  • a flow S which is directed towards the end-side opening 6 and consequently opposite the main flow direction H in the housing is generated.
  • FIG. 2 shows that the flow S or inflow direction R has an axial direction component R2, which is directed toward the first end opening 6 and is consequently opposite to the main flow direction H of the pump.
  • the conventional orientation is also indicated in FIG. 2 by the reference symbol N, so that it can be seen that the inflow direction R is oriented toward the end face of the suction housing 4 with respect to this conventional, vertical direction N. This results in the axial direction component R2 shown in FIG. 2.
  • 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 stream.
  • the wall areas below and / or above the mechanical seal 7 are also better washed.
  • FIG. 5a shows an embodiment in which the inlet connector is connected to FIG. 4 on the other side of the housing with respect to the longitudinal axis L, so that the embodiment according to FIG.
  • FIG. 5a is preferably used for a direction of rotation of the pump that is opposite to FIG. 4.
  • the embodiment according to FIG. 5b differs from that according to FIG. 5a in particular by a different dimensioning of the cross-sectional taper.
  • 5a and 5b show embodiments with round cross sections
  • FIG. 5c shows a modified embodiment with a non-round cross section, e.g. B. an oval or elliptical cross section
  • 5d shows an optional embodiment with a variably adapted cross section of the inlet connector.
  • 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 connection 11 which has a spiral-shaped inner wall which forms a spiral flow channel 14, so that within the inlet connection 11 a spiral flow is generated, which in the manner described with radial direction components R1 and
  • axial direction component R2 enters the housing interior.
  • This embodiment also allows the inflow essential to the invention to be improved for improved cleaning.
  • two bypass connections 12, 13 are provided in the embodiment according to FIGS. 6 to 8, 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 end opening 10 of the suction housing 4.
  • the second bypass connection 13 is connected to the pressure connection 15.
  • the cleaning medium for cleaning the pump is also supplied in the embodiment according to FIGS. 6 to 8 via the inlet connection 11 and is conveyed through the pump by means of the rotor 2 during operation of the pump.
  • 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 realized.
  • This embodiment with bypass connection can be realized in the same way in the embodiment according to FIGS. 1 to 5, i. H. a bypass nozzle 12, 13 or both bypass nozzles 12, 13 can be designed geometrically as described in connection with the inlet nozzle 11.
  • the geometric configuration of the inlet connector 11 explained in the description and in the claims consequently also relates, in an optional further development of the invention, to one or more bypass connectors which may be provided.
  • the pump housing or suction housing 4 consists of several parts, eg. B. can be formed in two parts
  • the inlet connection 11 is arranged offset in relation to the longitudinal axis L of the pump.
  • the geometry of the inlet connector 11 according to the invention can also be implemented in a variant, not shown, in which the inlet connector is oriented centrally with respect to the longitudinal axis L.
  • the cross-sectional taper shown in the figures can be realized. The same applies to the possibility of a spiral flow channel.

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Abstract

A pump housing (4) for an eccentric screw pump, comprising a housing casing (5) extending along a housing longitudinal axis (L), a first end-face opening (6), to which a shaft seal (7) for a connection shaft (8) can be connected, and a second end-face opening (10), to which a stator (I) can be connected, and comprising a tubular inlet nozzle (11), oriented transversely to the housing longitudinal axis (L), for feeding a medium that is to be conveyed, which inlet nozzle is connected to the housing casing (5) tangentially, offset in relation to the housing longitudinal axis (L). The geometry of the inlet nozzle (11) is designed in such a way that, as the medium flows into the housing interior through the inlet nozzle (II), a flow (S) is generated which has a radial direction component (RI) directed away outwardly from the housing longitudinal axis (L) and/or an axial direction component (R2) directed towards the first end-face opening (6).

Description

Pumpengehäuse  pump housing
Beschreibung: 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 which extends 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, and a second (stator-side) front opening to which a stator can be connected.
Ferner weist das Pumpengehäuse eine quer zur Gehäuselängsachse orien- tierten 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 the supply of a medium to be conveyed (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 flüssig- keitsdichten 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 ausge- bildet, und zwar bevorzugt zumindest im Bereich des Einlassstutzens. Die Gehäuselängsachse entspricht in diesem Fall der Zylinderachse. In addition, the invention 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, which is also referred to as a suction housing, being connected to the stator on the suction side. 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 rotor end with respect to the connecting shaft. A shaft seal is provided for liquid-tight sealing of the pump housing from the environment. B. can be designed as a mechanical seal. The housing shell of the pump housing or of the suction housing is preferably cylindrical, at least in regions (essentially), and preferably at least in the region of the inlet connector. 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 unter- schiedlichster Medien und insbesondere hochviskoser Flüssigkeiten in unter- schiedlichsten Industriebereichen verwendet werden. Die zu fördernden Flüssigkeiten können dabei z. B. auch Feststoffanteile enthalten. Das erfin- dungsgemäße Pumpengehäuse bzw. die erfindungsgemäße Exzenter- schneckenpumpe wird bevorzugt als Lebensmittelpumpe und folglich bevorzugt für die Förderung von Lebensmitteln eingesetzt. Sie wird auch als Hygiene- pumpe 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 Hygienevor- schriften. Such an eccentric screw pump is a pump from the group of rotating positive-displacement pumps, which are used to convey a wide variety of media and in particular highly viscous liquids in a wide variety of industrial sectors. The liquids to be pumped can, for. 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 consequently preferably for the conveyance of 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, cosmetic and chemical industries. Such pumps follow high 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 Rei- nigungsmedium mit der betriebenen Pumpe oder einer separat ange- schlossenen 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 soge- nannte„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 Exzenter- schneckenpumpen wandnahe Ablösegebiete und Totraumgebiete, die eine Reinigung beeinträchtigen können. Besonders kritisch kann in der Praxis z. B. In the case of 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 z. For example, a cleaning medium can be pumped through the pump using the operated pump or a separately connected cleaning pump, thereby cleaning the pump and the suction housing. The cleaning medium is consequently supplied through the inlet connection, which also serves to supply the medium to be conveyed during normal operation of the pump, and is conveyed with the rotor through the suction housing and the stator into the region of the pressure connection connected to the stator on the pressure side. A so-called “clean-in-place flushing (CIP)” succeeds, which makes it possible to clean all surfaces in the pump that come into contact with the product with minimal disassembly work. In practice, eccentric screw pumps are critical when it comes to peeling areas close to the wall and dead space areas that can impair cleaning. Particularly critical in practice, for. B.
der Bereich des Gehäuses sein, in dem die Wellenabdichtung (z. B. Gleitring- dichtung) angeordnet ist. be the area of the housing in which the shaft seal (eg mechanical seal) is arranged.
So sind bei herkömmlichen Exzenterschneckenpumpen bzw. deren Pumpen- gehäusen 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 ein- strömende 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 Stau- punkt 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 connections are connected centrally and consequently in a radial orientation to the cylindrical housing jacket, generally in the area of the mechanical seal, which, for. B. is arranged in the vicinity of the first end opening of the suction housing. The cleaning liquid flowing in through the central inlet connection is divided up when it hits the mechanical seal, so that cleaning liquid also gets into the area below the mechanical seal. Nonetheless, problems can arise during cleaning due to the division due to insufficient underflow of the mechanical seal. The division of the flow can also lead to a stagnation point above the mechanical seal and this can lead to cleaning problems 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 um- spült. Eine solche Gehäusegeometrie eines Pumpengehäuses für eine Exzenterschneckenpumpe wird z. B. in der DE 10 2008 014 235 A1 beschrieben. Aus der DE 292 15 797 U1 ist ein Sauggehäuse einer Exzenterschnecken- pumpe 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 To improve cleaning, solutions are known from practice in which the inlet connector is not centrally / radially oriented, but is connected tangentially to the housing jacket, so that it is not a divided flow, but a continuous flow on one side that flows around the mechanical seal. Such a housing geometry of a pump housing for an eccentric screw pump is, for. B. is described in DE 10 2008 014 235 A1. From DE 292 15 797 U1 a suction housing of an eccentric screw pump of a special design is known. The suction housing has an inlet connection for the medium to be conveyed which is connected to the housing jacket in the radial direction. Additional pipe sockets are for cleaning purposes
angeschlossen, die zur Erzeugung von turbulenten Roh rström ungen im Saug- gehäuse, 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 Rei- nigungsstutzen gefördert. connected, which are angled to generate turbulent pipe flows in the suction housing, especially in the area of the articulated connections. The cleaning is not carried out via the inlet connection, so that the cleaning medium is not conveyed through the pump even when the pump is operating, but the cleaning medium is conveyed through the special cleaning connection 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 Gleitring- dichtung. 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 type is e.g. B. also known from DE 10 2012 001 617 A1. The inlet is connected radially to the housing casing in a conventional manner, specifically in the area of the mechanical seal. The pump is provided with a storage space in the region of the transition to the stator, the storage space being designed to be free of recesses and / or bulges, as a result of which very good cleanability and hygiene are to be achieved, particularly in the field of food technology.
Ausgehend von dem vorbekannten Stand der Technik liegt der Erfindung das technische Problem zugrunde, ein Pumpengehäuse für eine Exzenter- schneckenpumpe, insbesondere für eine Lebensmittelpumpe bzw. Hygiene- pumpe der eingangs beschriebenen Art zu schaffen, welches bzw. welche sich bei einfacher Konstruktion durch optimierte Reinigungsmöglichkeiten aus- zeichnet. On the basis of 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 at the outset, which is simple in design with optimized cleaning options distinguished.
Zur Lösung dieser Aufgabe lehrt die Erfindung bei einem gattungsgemäßen Pumpengehäuse der eingangs beschriebenen Art, dass die Geometrie des Ein- lassstutzens (einschl. dessen Orientierung) derart ausgestaltet ist, dass im Zuge des Einströmens des Mediums durch den Einlassstutzen in das Ge- häuseinnere eine Strömung erzeugt wird, die (im Übergang zwischen Einlass- To achieve this object, the invention teaches in the case of a generic pump housing of the type described in the introduction that the geometry of the inlet connection (including its orientation) is designed such that a flow as the medium flows through the inlet connection into the interior of the housing is generated (in the transition between inlet
stutzen und Gehäusemantel) eine Einströmrichtung aufweist, die eine nach außen von der Gehäuselängsachse weggerichtete radiale Richtungs- komponente und/oder eine zu der ersten stirnseitigen (antriebsseitigen Öffnung) hingerichtete, axiale Richtungskomponente aufweist. connecting piece and housing shell) has an inflow direction which has a radial directional component which is directed outward from the longitudinal axis of the housing and / or an axial directional component which is oriented toward the first end-side (drive-side opening).
Die Erfindung geht dabei von der Erkenntnis aus, dass bei Exzenter- schneckenpumpen für den Lebensmittelbereich oder für andere Bereiche mit höchsten Hygienevorschriften der Reinigung des Pumpengehäuses, das be- vorzugt als Sauggehäuse ausgebildet ist, besondere Bedeutung zukommt. Dieses gilt insbesondere für eine CIP-Reinigung, bei welcher das Reinigungs- medium mit minimalen Demontage- bzw. Umrüstungsarbeiten durch den Ein- lassstutzen, der im Betrieb auf der Zuführung des zu fördernden Mediums dient, in das Pumpengehäuse eingeführt und mit dem Rotor durch das Pumpen- gehäuse 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 Gehäuse- mantel angeschlossen. Dabei weist er stets die erfindungsgemäße Geometrie zur Erzeugung der erläuterten Strömungsrichtungen auf. The invention is based on the knowledge that, in the case of 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 a CIP cleaning, in which the cleaning medium is inserted into the pump housing with minimal disassembly or retrofitting work through the inlet connection, which in operation serves to supply the medium to be pumped, and with the rotor through the Pump housing and the stator is conveyed through. The invention first of all comprises embodiments in which the inlet connector is connected to the cylindrical housing jacket centrally with respect to the longitudinal axis of the housing. Preferably, however, the inlet connection is (decentrally) connected tangentially to the housing jacket (essentially) offset to the longitudinal axis of the housing. It always has the geometry according to the invention for generating 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 grund- sätzlich bekannte tangentiale Anschluss wird jedoch erfindungsgemäß weiter optimiert, und zwar durch eine Geometrie, die eine asymmetrische und bevor- zugt eine „doppelt asymmetrische“ Strömung bzw. Einströmung in das Pumpengehäuse und insbesondere in dem Bereich der Gleitringdichtung The invention has recognized that cleaning can be optimized by a decentralized connection of the inlet connector and consequently a (substantially) tangential arrangement of the inlet connector. This basically known tangential connection is, however, further optimized according to the invention, namely by a geometry that has an asymmetrical and preferably a “double asymmetrical” flow or inflow into the pump housing and in particular in the area of the mechanical seal
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 Gleitring- dichtung 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. generated. The cleaning medium consequently does not flow exactly tangentially through the inlet connector into the interior of the housing, but instead (at the transition from the inlet connector into 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, making it particularly effective Rinsing of the mechanical seal preferably arranged in this area is generated. In this way, the inner wall of the suction housing is cleaned better and the dead space areas below and / or above the mechanical seal that may occur in practice are avoided. In addition, there is preferably also an orientation of the inflow, which is directed towards the downstream end face of the suction housing and consequently towards the front 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 around.
Die erfindungsgemäße Geometrie des Einlassstutzens lässt sich im Übrigen nicht nur bei der bevorzugten Ausführungsform realisieren, bei der der Einlass- stutzen dezentral versetzt zur Gehäuselängsachse angeordnet ist, sondern bei herkömmlichen Ausführungsformen mit zentral an den Gehäusemantel ange- schlossenem Einlassstutzen. The geometry of the inlet connector according to the invention can moreover not only be implemented in the preferred embodiment in which the inlet connector is arranged decentrally offset from the longitudinal axis of the housing, but in conventional embodiments with an inlet connector centrally connected 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 The cleaning is consequently optimized according to the invention by the flow, on the one hand, specifically directed outward from the longitudinal axis of the housing and, on the other hand, by the flow directed at the end face of the suction housing, and consequently by a special radial direction component and / or a special axial direction 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
Strömungsgeschwindigkeiten bzw. hohe Geschwindigkeitsgradienten an der Wand erreicht, die zu einer erheblichen Reduzierung von Totraumgebieten und einer verbesserten Reinigung der Wandbereiche führen. Die erfindungsgemäße Geometrie lässt sich in einer ersten Ausführungsform z. B. dadurch realisieren, dass sich die innere Querschnittsfläche des Ein- lassstutzens in Richtung zu dem Gehäusemantel hin, d. h. in der Einström- richtung, zumindest abschnittsweise verjüngt, und zwar bevorzugt asymmetrisch und besonders bevorzugt doppelt asymmetrisch. Die Verrin- gerung des Querschnitts führt zu einer vorteilhaften Erhöhung der Einström- geschwindigkeit und damit zu besseren Reinigungsergebnissen. Dazu kann z. B. der Ausgangsquerschnitt des Einlassstutzens (im Bereich des Gehäuse- mantels) relativ zu dessen Eingansquerschnitt reduziert sein. Optional oder ergänzend ist der Ausgangsquerschnitt relativ zu dessen Eingangsquerschnitt - bezogen auf die Stutzenlängsrichtung - asymmetrisch versetzt, und zwar be- vorzugt 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 Eingangs- querschnitt des Einlassstutzens lässt sich die erfindungsgemäße Strömung mit der erwähnten radialen Richtungskomponente und/oder der erwähnten axialen Richtungskomponente realisieren. Dabei können sowohl der Ausgangsquer- schnitt 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 Eingangs- querschnitt nicht rund, sondern z. B. oval oder auch elliptisch ausgebildet sind, jedoch ebenfalls in der beschriebenen Weise mit reduziertem Ausgangsquer- schnitt gegenüber dem Eingangsquerschnitt. Schließlich können auch andere Flow velocities or high velocity gradients on the wall are achieved, which lead to a considerable reduction in dead space areas and improved cleaning of the wall areas. The geometry according to the invention can in a first embodiment, for. This can be achieved, for example, by the inner cross-sectional area of the inlet connector tapering at least in sections in the direction of the housing shell, ie in the inflow direction, preferably asymmetrically and particularly preferably double asymmetrically. The reduction in the cross section leads to an advantageous increase in the inflow speed and thus to better cleaning results. For this, e.g. For example, the outlet cross-section of the inlet connector (in the area of the housing shell) 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, with respect to the longitudinal direction of the connecting piece, and 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 to the outside or to the outer wall of the housing moved there. As a result of the described asymmetrical offset of the outlet cross section relative to the inlet cross section of the inlet connector, the flow according to the invention can be realized with the radial direction component and / or the axial direction component mentioned. Both the exit cross section and the entry cross section (in a plan 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 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
Querschnittsformen realisiert werden, so dass eine individuelle Anpassung der Geometrie möglich ist. Jedenfalls erfolgt erfindungsgemäß eine gerichtete Ein- strömung und ggf. eine Erhöhung der Einströmgeschwindigkeit durch eine Querschnittsverjüngung. Cross-sectional shapes are realized so that an individual adjustment of the geometry is possible. In any case, according to the invention, there is a directional inflow and, if necessary, an increase in the inflow speed 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 inner- halb des Einlassstutzens erzeugt, so dass das Medium in der erfindungsgemäß definierten Orientierung aus dem Einlassstutzen in das Innere des Pumpen- gehäuses eintritt. Die erfindungswesentliche Orientierung der Strömung bzw. Einströmrichtung des Mediums wird folglich bei dieser Ausführungsform durch eine spiralförmig ausgestaltete Innenwand des Einlassstutzens realisiert. Dabei besteht die Möglichkeit, dass der Einlassstutzen unmittelbar in der be- schriebenen 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. In an alternative embodiment it is provided that the inlet connector has an inner wall which is of spiral form and thus forms a spiral flow channel and which in turn generates a spiral flow within the inlet connector, so that the medium in the orientation defined according to the invention from the inlet connector to the interior of the Pump housing enters. The orientation of the flow or inflow direction of the medium, which is essential to the invention, is consequently realized in this embodiment by a spiral-shaped inner wall of the inlet connector. There is the possibility that the inlet connector is directly geometrically designed in the manner described, i. H. the inlet connector itself is realized with the asymmetrical cross-sectional taper described or with the spiral configuration described. The pump housing is consequently made available directly with the geometry according to the invention in the course of production. The pump housing is preferably made of stainless steel. Alternatively, it can also be made of cast steel. In addition, embodiments made of plastic can also be considered as an alternative.
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. In an alternative embodiment, however, there is also the possibility of providing a specially designed socket insert which can be inserted into a (conventional) cylindrical pipe socket / inlet socket and thus provides the geometry which generates the flow essential to the invention. Such a separately manufactured nozzle insert can, for. 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. can also be used in the course of retrofitting a pump with a classic tangentially connected cylindrical pipe socket. The nozzle insert can, for. B. made of stainless steel, cast steel or alternatively also made of plastic.
Die Erfindung betrifft im Übrigen auch eine Exzenterschneckenpumpe mit einem Pumpengehäuse der beschriebenen Art. Eine solche Exzenter- schneckenpumpe 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 Kuppel- Stange 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. Jedenfalls ist innerhalb des Pumpengehäuses im Bereich der (antriebsseitigen) stirnseitigen Öffnung eine Wellenabdichtung, z. B. Gleitringdichtung, für die Ab- dichtung des Sauggehäuses vorgesehen. Der Einlassstutzen ist im Bereich der Wellenabdichtung angeordnet, d. h. er mündet im Bereich der Wellenab- The invention also relates to an eccentric screw pump with a pump housing of the type described. In a known manner, such an eccentric screw pump has, 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, a coupling rod arranged in the pump housing and a drive which is connected to the coupling rod via a connecting shaft. The drive consequently drives the rotating unit, which consists of the rotor and coupling rod, via the connecting shaft. The coupling rod can z. B. in a generally known manner via joints on the one hand the rotor and on the other hand the connecting shaft. Easily mountable joints are preferred for improved cleaning. As an option, classic joints can also be dispensed with in the transition areas between the connecting shaft and coupling rod on the one hand and coupling rod and rotor on the other. In this case, e.g. B. the use of a flexible or flexible coupling rod possible, for. B. made of a titanium material. A flexible coupling rod can also be directly connected in one piece to the rotor. In any case, inside the pump housing in the area of the (drive-side) front opening, a shaft seal, e.g. B. Mechanical seal, provided for the sealing of the suction housing. The inlet connector is arranged in the area of the shaft seal, ie it opens in the area of the shaft seal.
dichtung in den Gehäusemantel, so dass die Wellenabdichtung von dem zu fördernden Medium, z. B. Reinigungsmedium, umspült wird. seal in the housing shell, so that the shaft seal from the medium to be conveyed, eg. 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 Pumpen- gehäuse 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 gegenüber- liegenden 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 orien- tiert 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 Pumpen- betrieb mit rotierendem Rotor zum Einsatz kommen, wobei das Reinigungs- medium über den Einlassstutzen erfolgt. Even if the cleaning medium is supplied via the inlet connection, which serves to supply the medium to be conveyed during normal operation of the pump, it can be provided in a further development that the pump housing or the pump additionally has one or more bypass openings or bypass connections , For example, the pump housing, which is designed as a suction housing, can have a first bypass connection near the second end 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. B. is referred to as a pressure port. This pressure connector can have a second bypass connector, which is also oriented transversely to the longitudinal direction of the housing, the two bypass connectors being able to be connected to one another via a bypass line. In a CIP operation, such a bypass serves to guide excess cleaning medium, which is not conveyed through the stator chambers, from the suction housing into the pressure housing. It is important that these bypass nozzles do not serve the separate supply of a cleaning medium, but are used in the course of cleaning by pump operation with a rotating rotor, the cleaning medium being carried out via the inlet nozzle.
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 Reinigungs- medium von dem Einlassstutzen über das Sauggehäuse durch den Stator ge- pumpt wird, wobei eine die Gleitringdichtung umspülende Strömung erzeugt Finally, the invention also relates to a method for cleaning an eccentric screw pump of the type described. This method is characterized in that, with the rotatingly driven rotor, a cleaning medium is pumped through the stator from the inlet nozzle via the suction housing, one washing around the mechanical seal Flow generated
wird, deren Einströmrichtung die in der erfindungsgemäßen Weise eine nach außen von der Gehäuselängsachse weggerichtete, radiale Richtungskompo- nente und/oder eine zu der ersten stirnseitigen Öffnung hingerichtete, axiale Richtungskomponente (und folglich der Flauptströmungsrichtung entgegen- gesetzte Richtungskomponente) aufweist. whose direction of inflow has in the manner according to the invention a radial directional component facing away from the longitudinal axis of the housing and / or an axial directional component (and consequently the direction of the main flow opposite to the first flow opening) directed towards the first front opening.
Im Folgenden wird die Erfindung anhand von Zeichnungen erläutert, die ledig- lich Ausführungsbeispiele darstellen. Es zeigen: Fig. 1 eine Exzenterschneckenpumpe in einer vereinfachten Darstellung, The invention is explained below with reference to drawings, which only represent exemplary embodiments. 1 shows an eccentric screw pump in a simplified representation,
Fig. 2 schematisch vereinfacht einen ersten Schnitt durch eine Exzenter- schneckenpumpe im Bereich des Einlassstutzens, Fig. 3 einen zweiten Schnitt durch den Gegenstand nach Fig. 2, 2 schematically simplified a first section through an eccentric screw pump in the area of the inlet connector, FIG. 3 a second section through the object according to FIG. 2,
Fig. 4 eine vereinfachte Draufsicht auf den Gegenstand nach Fig. 2, 4 shows a simplified top view of the object according to FIG. 2,
Fig. 5a bis 5d abgewandelte Ausführungsformen des Gegenstandes nach 5a to 5d modified embodiments of the object according to
Fig. 4,  Fig. 4,
Fig. 6 eine zweite Ausführungsform einer erfindungsgemäßen Exzenter- schneckenpumpe, Fig. 7 einen Schnitt A-A durch den Gegenstand nach Fig. 6 und 6 shows a second embodiment of an eccentric screw pump according to the invention, FIG. 7 shows a section A-A through the object according to FIGS. 6 and
Fig. 8 einen Schnitt B-B durch den Gegenstand nach Fig. 6. 8 shows a section BB through the object according to 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 Pumpen- gehäuse 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 basically 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 a suction housing 4, is connected to the stator 1 on the suction side. A housing part connected on the pressure side to the stator 1 is, for. B. referred to as a connecting piece or pressure port 15. The pump housing 4 has a housing jacket 5 which extends along the longitudinal axis L of the housing and which is cylindrical in the exemplary embodiment, so that the longitudinal axis L of the housing 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 exzen- trische 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 darge- stellt. A connection shaft 8 is connected to the drive 3, which 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 with respect to the centrically rotating connection shaft 8. This is possible via 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 rohr- förmigen 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 end 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 end 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 conveyed, which is oriented transversely to the longitudinal axis of the housing or the cylinder axis L and is connected to the housing jacket 5. This inlet connection 11 is decentralized and consequently offset to the housing longitudinal axis L in a substantially tangential orientation to the housing jacket 5.
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 tangen- tial 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 Einström- richtung R aufweist, die eine nach außen von der Gehäuselängsache L weg- gerichtete, 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. In normal operation, the medium to be pumped is supplied via the inlet connection 11 and pumped through the stator 1 into the region of the pressure connection 15 via the suction housing 4 or its second opening 10. For the purpose of cleaning the pump, a cleaning medium is supplied via the inlet connection 11 in the cleaning mode, which is also conveyed by the rotating rotor 2 when the pump is operating. However, the cleaning medium can also be pumped through the pump shown with a separately connected cleaning pump. The already mentioned decentralized, tangential connection of the inlet connector 11 to the housing jacket 5 leads to an optimized washing around the mechanical seal 7 and thus to an improved cleaning of the areas below and / or above the mechanical seal 7. According to the invention, the geometry of the inlet connector is now not only tangent tially designed, but it is designed such that in the course of the inflow of the medium or cleaning medium through the inlet port 11 into the interior of the housing, a flow is generated which has an inflow direction R, which is directed outward from the longitudinal housing L , radial directional component R1 and also has an axial directional component R2 which is executed towards the first end opening 6. For this purpose, reference is made to FIGS. 2 and 3. The inflow direction R is the direction of the flow S of the medium in the region of the transition from the inlet connection 11 into the housing interior or to 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 weg- gerichtete Richtungskomponente R1. Dabei ist in Fig. 3 dargestellt, dass die In Fig. 3 it can be seen that precisely no tangential inflow is realized or that the inflow direction R is not oriented exactly tangentially with respect to the circumference of the housing shell 5, but that a flow directed outward from the longitudinal axis L of the housing is generated, that is to say that Flow has a directional component R1 directed radially outward from the longitudinal axis of the housing. It is shown in Fig. 3 that the
Einströmrichtung R gegenüber der herkömmlichen tangentialen (bzw. verti- kalen) 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 Gleitring- dichtung 7 vermieden. Zusätzlich wird bei der erfindungsgemäßen Ausführungsform eine zu der stirn- seitigen Öffnung 6 hingerichtete und folglich der Hauptströmungsrichtung H im Gehäuse entgegengesetzte Strömung S erzeugt. Dazu wird auf Fig. 2 ver- wiesen 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 Bezugs- zeichen 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 Gleitring- dichtung 7 besser umspült. The inflow direction R is directed outward relative to the conventional tangential (or vertical) orientation N, so that the radial direction component R1 results. This outward flow direction R of the flow S, which is directed towards the inside of the housing shell, leads to improved washing around the mechanical seal 7 and thus to an improved cleaning of the inner wall of the housing shell 5. In addition, dead space areas below and above the mechanical seal 7 are avoided. In addition, in the embodiment according to the invention, a flow S which is directed towards the end-side opening 6 and consequently opposite the main flow direction H in the housing is generated. For this purpose, reference is made to FIG. 2, which shows that the flow S or inflow direction R has an axial direction component R2, which is directed toward the first end opening 6 and is consequently opposite to the main flow direction H of the pump. The conventional orientation is also indicated in FIG. 2 by the reference symbol N, so that it can be seen that the inflow direction R is oriented toward the end face of the suction housing 4 with respect to this conventional, vertical direction N. This results in the axial direction component R2 shown in FIG. 2. 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 stream. 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 Ein- lassstutzens 11 in Richtung zu dem Gehäusemantel 5 hin asymmetrisch ver- In the exemplary embodiment in FIGS. 2 to 4, this geometry according to the invention is realized in that the inner cross-sectional area of the inlet connector 11 is asymmetrically displaced in the direction of the housing jacket 5.
jüngt. Das bedeutet, dass der Ausgangsquerschnitt 11 a des Einlassstutzens 11 in einer Draufsicht relativ zu dessen Eingangsquerschnitt 11 b 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 ver- setzt (vgl. Fig. 4). Dadurch werden die beschriebenen vorteilhaften Strömungs- verhältnisse erzeugt. Die Fig. 5a, 5b, 5c und 5d zeigen Abwandlungen der Ausführungsform nach Fig. 4. Fig. 5a zeigt eine Ausführungsform, bei der der Einlassstutzen gegen- über 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 insbe- sondere 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. tapers. This means that the outlet cross-section 11 a of the inlet connection 11 is reduced in a plan view relative to the inlet cross-section 11 b thereof and is also asymmetrically offset with respect to the longitudinal direction of the connection. In the exemplary embodiment shown, the output cross section 11a is displaced outward both in the axial direction towards the first front housing opening 6 and in the radial direction from the housing longitudinal axis L (cf. FIG. 4). This creates the advantageous flow conditions described. 5a, 5b, 5c and 5d show modifications of the embodiment according to FIG. 4. FIG. 5a shows an embodiment in which the inlet connector is connected to FIG. 4 on the other side of the housing with respect to the longitudinal axis L, so that the embodiment according to FIG. 5a is preferably used for a direction of rotation of the pump that is opposite to FIG. 4. The embodiment according to FIG. 5b differs from that according to FIG. 5a in particular by a different dimensioning of the cross-sectional taper. 4, 5a and 5b show embodiments with round cross sections, FIG. 5c shows a modified embodiment with a non-round cross section, e.g. B. an oval or elliptical cross section. 5d shows an optional embodiment with a variably adapted cross section of the inlet connector.
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 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 connection 11 which has a spiral-shaped inner wall which forms a spiral flow channel 14, so that within the inlet connection 11 a spiral flow is generated, which in the manner described with radial direction components R1 and
axialer Richtungskomponente R2 in das Gehäuseinnere eintritt. Auch durch diese Ausführungsform lässt sich folglich die erfindungswesentliche Ein- strömung zur verbesserten Reinigung realisieren. Darüber hinaus sind bei der Ausführungsform nach den Fig. 6 bis 8 zwei Bypassstutzen 12, 13 vorgesehen, die mit einer nicht dargestellten Bypasslei- tung miteinander verbunden werden können. Der erste Bypassstutzen 12 ist an das Sauggehäuse 4 angeschlossen, und zwar in der Nähe der zweiten stirn- seitigen 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 Weiter- bildung der Erfindung auch auf einen oder mehrere ggf. vorgesehene Bypass- stutzen. axial direction component R2 enters the housing interior. This embodiment also allows the inflow essential to the invention to be improved for improved cleaning. In addition, two bypass connections 12, 13 are provided in the embodiment according to FIGS. 6 to 8, 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 end opening 10 of the suction housing 4. The second bypass connection 13 is connected to the pressure connection 15. The cleaning medium for cleaning the pump is also supplied in the embodiment according to FIGS. 6 to 8 via the inlet connection 11 and is 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 realized. This embodiment with bypass connection can be realized in the same way in the embodiment according to FIGS. 1 to 5, i. H. a bypass nozzle 12, 13 or both bypass nozzles 12, 13 can be designed geometrically as described in connection with the inlet nozzle 11. The geometric configuration of the inlet connector 11 explained in the description and in the claims consequently also relates, in an optional further development of the invention, to one or more bypass connectors which may be provided.
Im Übrigen ist in den Fig. 6 bis 8 beispielhaft dargestellt, dass das Pumpenge- häuse bzw. Sauggehäuse 4 mehrteilig, z. B. zweiteilig ausgebildet sein kann Incidentally, it is shown in FIGS. 6 to 8 by way of example that the pump housing or suction housing 4 consists of several parts, eg. B. can be formed in two parts
und dazu zwei in axialer Richtung hintereinander angeordnete Gehäuseab- schnitte 4a, 4b aufweisen kann. and for this purpose 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 ver- setzt 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 Quer- Schnittsverjüngung realisiert sein. Gleiches gilt für die Möglichkeit eines spiral- förmig ausgebildeten Strömungskanals. For the rest, only one embodiment is shown in the invention in which the inlet connection 11 is arranged offset in relation to the longitudinal axis L of the pump. However, the geometry of the inlet connector 11 according to the invention can also be implemented in a variant, not shown, in which the inlet connector is oriented centrally with respect to the longitudinal axis L. In such an embodiment, for. B. the cross-sectional taper shown in the figures can be realized. The same applies to the possibility of a spiral flow channel.

Claims

Patentansprüche: claims:
1. Pumpengehäuse (4) für eine Exzenterschneckenpumpe, insbesondere für eine Hygienepumpe, mit einem sich entlang einer Gehäuselängsachse (L) erstreckenden Gehäuse- mantel (5), mit einer ersten, stirnseitigen Öffnung (6), an die eine Wellenabdichtung (7) für eine Verbindungswelle (8) anschließbar ist, und mit einer zweiten, stirnseitigen Öffnung (10), an die ein Stator (1 ) anschließbar ist und mit einem quer zur Gehäuselängsachse (L) orientierten rohrförmigen Einlass- stutzen (11 ) für die Zuführung eines zu fördernden Mediums, 1. Pump housing (4) for an eccentric screw pump, in particular for a hygiene pump, with a housing jacket (5) extending along a longitudinal axis (L) of the housing, with a first, front opening (6) to which a shaft seal (7) for a connecting shaft (8) can be connected, and with a second front opening (10) to which a stator (1) can be connected and with a tubular inlet connector (11) oriented transversely to the longitudinal axis of the housing (L) for the supply of one promotional medium,
d a d u r c h g e k e n n z e i c h n e t, dass die Geometrie des Einlassstutzens (11 ) derart ausgestaltet ist, dass im Zuge des Einströmens des Mediums durch den Einlassstutzen (11 ) in das Gehäuseinnere eine Strömung (S) erzeugt wird, die eine Einströmrichtung (R) mit einer nach außen von der Gehäuselängs- achse (L) weggerichteten, radialen Richtungskomponente (R1 ) und/oder einer zu der ersten stirnseitigen Öffnung (6) hingerichteten, axialen Richtungs- komponente (R2) aufweist. characterized in that the geometry of the inlet connector (11) is designed such that in the course of the inflow of the medium through the inlet connector (11) into the interior of the housing, a flow (S) is generated, which has an inflow direction (R) with an outward from the Longitudinal longitudinal axis (L) facing away, radial directional component (R1) and / or an axial directional component (R2) directed towards the first end opening (6).
2. Pumpengehäuse nach Anspruch 1 , dadurch gekennzeichnet, dass der Gehäusemantel (5) zumindest im Bereich des Einlassstutzens (11 ) im Wesent- lichen zylindrisch ausgebildet ist. 2. Pump housing according to claim 1, characterized in that the housing jacket (5) is essentially cylindrical at least in the region of the inlet connector (11).
3. Pumpengehäuse nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sich die innere Querschnittsfläche des Einlassstutzens (11 ) in Richtung zu dem Gehäusemantel (5) hin zumindest abschnittsweise verjüngt. 3. Pump housing according to claim 1 or 2, characterized in that the inner cross-sectional area of the inlet connector (11) tapers at least in sections towards the housing jacket (5).
4. Pumpengehäuse nach Anspruch 3, dadurch gekennzeichnet, dass der Aus- gangsquerschnitt (11a) des Einlassstutzens (11 ) relativ zu dessen Eingangs- querschnitt (11 b) reduziert ist und/oder asymmetrisch versetzt ist, z. B. in axialer Richtung zu der ersten stirnseitigen Gehäuseöffnung hin und/oder in radialer Richtung von der Gehäuselängsachse nach außen weg versetzt ist. 4. Pump housing according to claim 3, characterized in that the outlet cross-section (11a) of the inlet connector (11) is reduced relative to its inlet cross-section (11b) and / or is asymmetrically offset, for. B. is offset in the axial direction to the first front housing opening and / or in the radial direction away from the longitudinal axis of the housing.
5. Pumpengehäuse nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Einlassstutzen (11 ) eine spiralförmige ausgebildete und einen spiralförmigen Strömungskanal (14) bildende Innenwand aufweist, die eine spiralförmige Strömung erzeugt. 5. Pump housing according to claim 1 or 2, characterized in that the inlet connection (11) has a spiral-shaped and a spiral-shaped flow channel (14) forming inner wall, which generates a spiral flow.
6. Pumpengehäuse nach einem der Ansprüche 1 bis 5, dadurch gekennzeich- net, dass der Einlassstutzen (11 ) versetzt zu der Gehäuselängsachse (L) tangential an den Gehäusemantel (5) angeschlossen ist. 6. Pump housing according to one of claims 1 to 5, characterized in that the inlet connection (11) is connected offset tangentially to the housing longitudinal axis (L) to the housing jacket (5).
7. Pumpengehäuse nach einem der Ansprüche 1 bis 6, dadurch gekennzeich- net, dass das Pumpengehäuse (4) als geteiltes Gehäuse mit zwei in axialer Richtung hintereinander angeordneten Gehäuseabschnitten (4a, 4b) ausge- bildet ist. 7. Pump housing according to one of claims 1 to 6, characterized in that the pump housing (4) is designed as a divided housing with two housing sections (4a, 4b) arranged one behind the other in the axial direction.
8. Pumpengehäuse nach einem der Ansprüche 1 bis 7, dadurch gekennzeich- net, dass das Pumpengehäuse (4) zusätzlich in dem der zweiten stirnseitigen Öffnung (10) zugeordneten Bereich einen quer zur Gehäuselängsrichtung (L) orientierten, ersten Bypassstutzen (12) aufweist. 8. Pump housing according to one of claims 1 to 7, characterized in that the pump housing (4) additionally has, in the area assigned to the second end opening (10), a first bypass connection (12) oriented transversely to the housing longitudinal direction (L).
9. Pumpengehäuse nach einem der Ansprüche 1 bis 8, dadurch gekennzeich- net, dass der Einlassstutzen (11 ) einen an den Gehäusemantel (5) ange- schlossenen symmetrischen Rohrstutzen aufweist, in den ein asymmetrisch 9. Pump housing according to one of claims 1 to 8, characterized in that the inlet connection (11) has a symmetrical pipe connection connected to the housing jacket (5), into which an asymmetrical
ausgebildeter Stutzeneinsatz unter Bildung der die Strömung erzeugenden Geometrie eingesetzt ist, vorzugsweise lösbar eingesetzt ist. trained nozzle insert is used to form the flow-generating geometry, preferably is used releasably.
10. Exzenterschneckenpumpe, insbesondere Hygienepumpe, mit einem Pumpengehäuse (4) nach einem der Ansprüche 1 bis 9 und mit zumindest einem an die zweite stirnseitige Öffnung (10) angeschlossenen Stator10. eccentric screw pump, in particular hygiene pump, with a pump housing (4) according to one of claims 1 to 9 and with at least one to the second end opening (10) connected to the stator
(1 ). einem in dem Stator (1 ) angeordneten Rotor (2), einer in dem Pumpengehäuse (4) angeordneten Kuppelstange (9), einem Antrieb (3), der über eine Verbindungswelle (8) an die Kuppelstange (9) angeschlossen ist, einer zumindest bereichsweise in dem Pumpengehäuse (4) an- geordneten und an die erste stirnseitige Öffnung (6) angeschlossene Wellenabdichtung (7), z. B. Gleitringdichtung, für die Verbindungswelle (8), dadurch gekennzeichnet, dass der Einlassstutzen (11 ) im Bereich der Wellen- abdichtung (7) in den Gehäusemantel (5) mündet, so dass die Wellenabdich- tung (7) von dem zu fördernden Medium mit einer Strömung umspült wird, die eine Einströmrichtung mit einer nach außen von der Gehäuselängsachse (L) weggerichteten, radialen Richtungskomponente und/oder einer zu der ersten stirnseitigen Öffnungen hingerichteten, axialen Richtungskomponente aufweist. (1 ). 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) via a connecting shaft (8), at least one partially arranged in the pump housing (4) and connected to the first end opening (6) shaft seal (7), z. B. mechanical seal, for the connecting shaft (8), characterized in that the inlet port (11) in the area of the shaft seal (7) opens into the housing jacket (5), so that the shaft seal (7) is to be conveyed Medium is flushed with a flow which has an inflow direction with a radial directional component directed outwards from the longitudinal axis (L) of the housing and / or an axial directional component directed towards the first end openings.
11. Exzenterschneckenpumpe nach Anspruch 10, dadurch gekennzeichnet, dass das Pumpengehäuse (4) zusätzlich in dem der zweiten stirnseitigen Öffnung (10) zugeordneten Bereich einen quer zur Gehäuselängsrichtung (L) orientierten ersten Bypassstutzen (12) aufweist und dass an das dem Pumpen- gehäuse (4) gegenüberliegende Ende des Stators (1 ) ein Druckstutzen (15) angeschlossen ist, der einen quer zur Gehäuselängsrichtung orientierten zweiten Bypassstutzen (13) aufweist, wobei das zu fördernden Medium über eine zwischen den Bypassstutzen (12, 13) angeordnete Bypassleitung vom Statorausgang zum Statoreingang rückführbar ist. 11. Eccentric screw pump according to claim 10, characterized in that the pump housing (4) additionally in the area assigned to the second end opening (10) has a first bypass connection (12) oriented transversely to the longitudinal direction of the housing (L) and that to the pump housing (4) opposite end of the stator (1), a pressure connection (15) is connected, which has a second bypass connection (13) oriented transversely to the longitudinal direction of the housing, the medium to be conveyed via a bypass line arranged between the bypass connection (12, 13) from the stator outlet is traceable to the stator input.
12. Verfahren zum Reinigen einer Exzenterschneckenpumpe nach Anspruch 11 , dadurch gekennzeichnet, dass mit dem rotierend angetriebenen Rotor (2) ein Reinigungsmedium von dem Einlassstutzen (11 ) durch das Pumpen- gehäuse (4) und den Stator (1 ) gepumpt wird, wobei eine die Gleitringdichtung umspülende Strömung erzeugt wird, die eine Einströmrichtung mit einer nach außen von der Gehäuselängsachse (L) weggerichteten, radialen Richtungs- komponente (R1 ) und/oder einer zu der ersten stirnseitigen Öffnung hingerich- teten axialen Richtungskomponente aufweist. 12. A method for cleaning an eccentric screw pump according to claim 11, characterized in that with the rotatingly driven rotor (2) a cleaning medium is pumped from the inlet port (11) through the pump housing (4) and the stator (1), one A flow flowing around the mechanical seal is generated, which has an inflow direction with a radial direction component (R1) directed outward from the longitudinal axis of the housing (L) and / or an axial direction component directed towards the first end 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

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

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EP19718682.8A Active EP3824162B1 (en) 2018-07-18 2019-04-17 Pump housing

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

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* 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 Eccentric screw pump
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 Pumpenfabrik Wangen GmbH, 88239 Wangen 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

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DE102018117374A1 (en) 2020-01-23
US20210140428A1 (en) 2021-05-13
EP3824162B1 (en) 2023-10-04
US11441560B2 (en) 2022-09-13
WO2020015873A1 (en) 2020-01-23

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