EP0740075A1 - Screw pump - Google Patents

Screw pump Download PDF

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Publication number
EP0740075A1
EP0740075A1 EP96105517A EP96105517A EP0740075A1 EP 0740075 A1 EP0740075 A1 EP 0740075A1 EP 96105517 A EP96105517 A EP 96105517A EP 96105517 A EP96105517 A EP 96105517A EP 0740075 A1 EP0740075 A1 EP 0740075A1
Authority
EP
European Patent Office
Prior art keywords
screw
adjusting
delivery pressure
conveyor
tensioning
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
EP96105517A
Other languages
German (de)
French (fr)
Other versions
EP0740075B1 (en
Inventor
Martin Maier
Kurt Wagner
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.)
Knauf Marmorit GmbH
Original Assignee
Koch Marmorit GmbH
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Publication date
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Publication of EP0740075A1 publication Critical patent/EP0740075A1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F21/00—Implements for finishing work on buildings
    • E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
    • E04F21/06—Implements for applying plaster, insulating material, or the like
    • E04F21/08—Mechanical implements
    • E04F21/10—Mechanical implements centrifugally acting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • F04B19/08—Scoop devices
    • F04B19/12—Scoop devices of helical or screw-type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0027—Varying behaviour or the very pump
    • F04D15/0033—By-passing by increasing clearance between impeller and its casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • F04D3/02—Axial-flow pumps of screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts

Definitions

  • the invention relates to a screw pump, as e.g. for pumping pasty materials, especially building materials such as mixed plasters or the like. is used, as known from DE 86 09 300 U1 or DE-OS 22 37 563.
  • a screw pump In order to convey the material to be pumped, a screw pump has a rotatably mounted screw conveyor which can be driven by a drive device and which, when the material is transported, acts on it with the pressure required for pumping. Screw pumps are e.g. used for mixing and conveying building materials, especially as a continuous mixer or plastering machine.
  • the screw conveyor is surrounded by a screw casing made of (conditionally) flexible material (plastic or rubber).
  • the screw shell must lie tightly against the "thread” or “screw” of the screw conveyor and withstand the pressure exerted on the material by the screw conveyor.
  • the screw shell is surrounded by a tensioning device, which is generally a type of metal sleeve. This sleeve has a peripheral portion which extends over less than 360 ° around the closed screw shell and has adjacent radially projecting flanges or the like by means of clamping bolts. are interconnected. Radial tension is applied to the screw shell by means of the tensioning bolts, so that the latter lies firmly against the screw conveyor.
  • the screw shell is subject to constant wear due to friction with the screw conveyor and the material to be pumped, which is why it must be replaced relatively frequently.
  • Screw pumps are known from DE 86 09 300 U1 and DE-OS 22 37 563, in which the screw casing is tensioned against the screw conveyor by means of a hydraulically or pneumatically operable adjusting device and is optimally pre-tensioned at the respectively set target value.
  • the tensioning screws mentioned above are thus replaced by the adjustment device.
  • the invention has for its object to provide a screw pump in which the screw shell is subject to little wear.
  • a screw pump which is provided with a screw conveyor, a drive device for rotatingly driving the screw conveyor, a screw casing surrounding the screw conveyor and a tensioning device for tensioning the screw casing against the Screw conveyor, the tensioning device tensioning the screw shell against the screw conveyor by means of a controllable adjusting device.
  • the tensioning device automatically tensions the screw shell against the screw conveyor by means of the controllable adjusting device.
  • the adjusting device can be controlled as a function of the delivery pressure of the mass to be pumped, in such a way that the force with which the screw casing is tensioned against the delivery screw increases with increasing delivery pressure, in particular being proportional to the delivery pressure.
  • the essential feature of the screw pump according to the invention consists in the load- or delivery pressure-dependent setting of the tensioning device and thus the load- or delivery pressure-dependent preload of the screw shell radially against the screw conveyor. This makes it possible to be able to clamp the screw casing against the screw as much as is necessary for the current delivery pressure. This reduces the friction and thus the wear of the screw shell. Finally, however, there is also the possibility of automatically adjusting the screw casing according to its wear in a screw pump.
  • the service life of a snail shell can be extended significantly. Tests have shown that there is an improvement by at least a factor of 2 here. If one considers how laborious the replacement of the screw shell is, it is clear that the invention is also a significant improvement in handling the screw pump, in particular regarding the maintenance of the screw pump.
  • the screw pump can be operated with minimal friction between the screw conveyor and the screw casing. If the delivery pressure is low, it is possible to work with a low screw jacket pressure, which advantageously also has an effect on a reduction in the energy to be used to operate the screw pump.
  • the tensioning device is activated in such a way that the tension increases with increasing delivery pressure, this dependence being particularly proportional.
  • the delivery pressure can also be determined on the basis of the current operating parameters of the drive device (in the case of an electric motor, for example, the motor current).
  • a hydraulic motor is expediently used as the drive device; This has the advantage that the hydraulic pressure and thus the hydraulic fluid can be used directly for actuating and controlling the tensioning device, which has at least one hydraulic ram, which is used to tension or relax the screw shell either by tension or pressure or by pressure or Train is stressed (pressure or train stamp).
  • the tensioning device preferably comprises a plurality of tensioning elements (e.g. hydraulic rams) which act on the tensioning device in a distributed manner along the axial extent of the screw shell.
  • tensioning elements e.g. hydraulic rams
  • several adjustment elements can also act on the clamping device with the same force. This allows a constant tension profile to be achieved over the entire axial length of the screw shell.
  • the adjustment element or elements of the adjustment device for the controlled adjustment of the tensioning device can have a wide variety of configurations. Hydraulic stamps, motor-driven spindles or motor-driven lever systems are possible.
  • FIG. 1 shows a side view of a screw pump 10.
  • the screw pump 10 is with a Auger housing 12 rotatably mounted screw conveyor 14, which has an axis and a screw spiral extending around the axis.
  • a hydraulic motor, indicated at 16, is provided as the drive device for rotatingly driving the screw conveyor 14.
  • the housing 12 of the screw pump 10 has an inlet 18 and an outlet 20, which are arranged at the two axial ends of the screw conveyor 14.
  • the structure of the housing 12 is explained in more detail below with reference to FIG. 2.
  • the screw conveyor 14 is sealed by a screw shell 22 made of elastic material.
  • a plastic material is used for this.
  • a metal sleeve 24 is arranged around the screw casing 22 as a tensioning device, which presses radially from the outside against the screw casing 22 and in turn brings it tightly against the screw conveyor 14.
  • the tensioning collar 24 encloses the screw shell 22 over almost 360 °, and is therefore not completely closed. In the area of the open end of the tensioning collar 24, this is provided with essentially radially projecting flanges 25, 26, which can be moved relative to one another by means of an automatically actuated adjusting device 28 for adjusting the tension acting on the screw shell 22.
  • the screw conveyor 14 When conveying material through the screw pump, the screw conveyor 14 pressurizes the material.
  • the screw casing 22 must withstand this pressure. For this reason, it is surrounded by the tensioning collar 24.
  • the higher the delivery pressure the higher the force with which the screw shell 22 is pressed radially against the feed screw 14.
  • an automatic system for automatically adjusting the tension of the tensioning collar is provided in the worm pump 10 to be described here.
  • the delivery pressure is determined by the nature of the material (viscosity) and by the cross section and the length of the delivery hose (not shown in the figures) that can be connected to the outlet of the screw pump housing 12. Furthermore, it can be determined that the pressure acting on the pumping material varies along the screw conveyor 14.
  • the respective delivery pressure at the screw pump 10 is determined.
  • a hydraulic motor 16 is used as the drive device.
  • the operating pressure of this hydraulic motor 16 is proportional to the delivery pressure, so that the operating pressure is more suitable for direct control Adjustment elements of the adjustment device 28 can be used.
  • this has hydraulic pressure rams 30, the cylinders 32 of which are mechanically connected to the flange 25 of the tensioning collar 24.
  • this flange 25 is connected to a fastening element 34 which extends tangentially to the screw conveyor 14 and on which the stamp cylinder 32 is rotatably mounted at 36.
  • the piston 38 protruding from the cylinder 32 is rotatably mounted on a lever 40, the end of which, remote from this mounting point 42, is supported against the flange 25 of the clamping collar 24, to which the plunger 32 is connected via the fastening element 34.
  • the other flange 26 is braced via a tension element 44 with the end of the lever 40 which is supported on the flange 25.
  • the lever 40 is pivoted about its point of contact 46 on the flange 25, the distance between this end of the lever 40 and the flange 26 changes, which in turn is due to the Tension element 44 results in acting tensile stress, which is converted into a radial compression of the tensioning collar 24. This exerts pressure on the screw shell 22.
  • a hydraulic tension ram is used in the alternative according to FIG. 3 30 'is used, the cylinder 32' of which is connected to the flange 26 of the clamping collar 24 via a connecting element 34 '.
  • the piston 38 'protruding from the cylinder 32' is connected to a lever 40 'which is rigidly connected to the other flange 25 of the clamping collar 24.
  • the piston rod 38 ' With increasing operating pressure of the hydraulic motor 16, the piston rod 38 'is moved into the cylinder 32'.
  • the lever 40 ' is moved towards the cylinder 32' and thus the two flanges 25, 26 are moved towards one another.
  • the prestressing force setting of the tensioning collar 24 takes place in this way.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)
  • Control Of Fluid Pressure (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Reciprocating Pumps (AREA)
  • Rotary Pumps (AREA)
  • Screw Conveyors (AREA)

Abstract

The controllable adjusting system (28) is controllable depending on the output signal of the measuring system. The clamping pressure exerted by the worm casing (22) against the conveying screw (14) is esp. proportional to the conveying pressure. A determination system is provided for determining the conveying pressure from the operating parameters of the drive system (16). The adjusting system (28) is controllable depending on the output signal of the determination system. The drive unit (16) and the adjusting system are respectively driven hydraulically.

Description

Die Erfindung betrifft eine Schneckenpumpe, wie sie z.B. zum Pumpen von pastösen Materialien, insbesondere Baumaterialien wie angemachte Putzmischungen o.dgl. eingesetzt wird, wie aus DE 86 09 300 U1 oder DE-OS 22 37 563 bekannt.The invention relates to a screw pump, as e.g. for pumping pasty materials, especially building materials such as mixed plasters or the like. is used, as known from DE 86 09 300 U1 or DE-OS 22 37 563.

Eine Schneckenpumpe weist zum Fördern des zu pumpenden Materials eine drehbar gelagerte und von einer Antriebsvorrichtung antreibbare Förderschnecke auf, die beim Transport des Materials dieses mit den zum Pumpen erforderlichen Druck beaufschlagt. Schneckenpumpen werden z.B. zum Mischen und Fördern von Baumaterialien insbesondere als Durchlaufmischer oder Putzmaschinen eingesetzt.In order to convey the material to be pumped, a screw pump has a rotatably mounted screw conveyor which can be driven by a drive device and which, when the material is transported, acts on it with the pressure required for pumping. Screw pumps are e.g. used for mixing and conveying building materials, especially as a continuous mixer or plastering machine.

Die Förderschnecke ist umgeben von einem Schneckenmantel aus (bedingt) flexiblem Material (Kunststoff oder Gummi). Der Schneckenmantel muß dicht an dem "Gewinde" oder "Schraube" der Förderschnecke anliegen und dem von der Förderschnecke auf das Material aufgebrachten Druck widerstehen. Zu diesem Zweck ist der Schneckenmantel von einer Spannvorrichtung umgeben, bei der es sich im allgemeinen um eine Art Metall-Manschette handelt. Diese Manschette weist einen Umfangsabschnitt auf, der sich über weniger als 360° um den geschlossenen Schneckenmantel erstreckt und einander benachbarte radial abstehende Flansche aufweist, die mittels Spannbolzen o.dgl. miteinander verbunden sind. Durch die Spannbolzen wird über die Manschette radial Spannung auf den Schneckenmantel aufgebracht, so daß sich dieser fest an die Förderschnecke anlegt.The screw conveyor is surrounded by a screw casing made of (conditionally) flexible material (plastic or rubber). The screw shell must lie tightly against the "thread" or "screw" of the screw conveyor and withstand the pressure exerted on the material by the screw conveyor. For this purpose the The screw shell is surrounded by a tensioning device, which is generally a type of metal sleeve. This sleeve has a peripheral portion which extends over less than 360 ° around the closed screw shell and has adjacent radially projecting flanges or the like by means of clamping bolts. are interconnected. Radial tension is applied to the screw shell by means of the tensioning bolts, so that the latter lies firmly against the screw conveyor.

Der Schneckenmantel ist infolge von Reibung mit der Förderschnecke und dem zu pumpenden Material einem stetigen Verschleiß ausgesetzt, weshalb er relativ häufig ausgewechselt werden muß.The screw shell is subject to constant wear due to friction with the screw conveyor and the material to be pumped, which is why it must be replaced relatively frequently.

Aus DE 86 09 300 U1 und DE-OS 22 37 563 sind jeweils Schneckenpumpen bekannt, bei denen der Schneckenmantel mittels einer hydraulisch bzw. pneumatisch betreibbaren Verstellvorrichtung gegen die Förderschnecke gespannt und auf dem jeweils eingestellten Sollwert optimal vorgespannt gehalten wird. Die oben erwähnten Spannschrauben sind also insoweit durch die Verstellvorrichtung ersetzt.Screw pumps are known from DE 86 09 300 U1 and DE-OS 22 37 563, in which the screw casing is tensioned against the screw conveyor by means of a hydraulically or pneumatically operable adjusting device and is optimally pre-tensioned at the respectively set target value. The tensioning screws mentioned above are thus replaced by the adjustment device.

Der Erfindung liegt die Aufgabe zugrunde, eine Schneckenpumpe zu schaffen, bei der der Schneckenmantel einem geringen Verschleiß unterliegt.The invention has for its object to provide a screw pump in which the screw shell is subject to little wear.

Die Lösung dieser Aufgabe erfolgt nach der Erfindung mittels einer Schneckenpumpe, die versehen ist mit einer Förderschnecke, einer Antriebsvorrichtung zum drehenden Antreiben der Förderschnecke, einem die Förderschnecke umgebenden Schneckenmantel und einer Spannvorrichtung zum Spannen des Schneckenmantels gegen die Förderschnecke, wobei die Spannvorrichtung den Schneckenmantel mittels einer ansteuerbaren Verstellvorrichtung gegen die Förderschnecke spannt.This object is achieved according to the invention by means of a screw pump, which is provided with a screw conveyor, a drive device for rotatingly driving the screw conveyor, a screw casing surrounding the screw conveyor and a tensioning device for tensioning the screw casing against the Screw conveyor, the tensioning device tensioning the screw shell against the screw conveyor by means of a controllable adjusting device.

Erfindungsgemäß spannt die Spannvorrichtung den Schneckenmantel mittels der ansteuerbaren Verstellvorrichtung automatisch gegen die Förderschnecke. Dabei ist die Verstellvorrichtung in Abhängigkeit von dem Förderdruck der zu pumpenden Masse ansteuerbar, und zwar derart, daß die Kraft, mit der der Schneckenmantel gegen die Förderschnecke gespannt ist, mit zunehmendem Förderdruck ansteigt, insbesondere proportional zum Förderdruck ist.According to the invention, the tensioning device automatically tensions the screw shell against the screw conveyor by means of the controllable adjusting device. The adjusting device can be controlled as a function of the delivery pressure of the mass to be pumped, in such a way that the force with which the screw casing is tensioned against the delivery screw increases with increasing delivery pressure, in particular being proportional to the delivery pressure.

Das wesentliche Merkmal der erfindungsgemäßen Schneckenpumpe besteht in der last- bzw. förderdruckabhängigen Einstellung der Spannvorrichtung und damit der last- bzw. förderdruckabhängigen Vorspannung des Schneckenmantels radial gegen die Förderschnecke. Damit ist es möglich, den Schneckenmantel so stark gegen die Förderschnecke spannen zu können, wie es für den augenblicklich abverlangten Förderdruck erforderlich ist. Damit werden die Reibung und damit der Verschleiß des Schneckenmantels reduziert. Schließlich ist aber auch die Möglichkeit gegeben, bei einer Schneckenpumpe den Schneckenmantel seinem Verschleiß entsprechend automatisch nachzustellen.The essential feature of the screw pump according to the invention consists in the load- or delivery pressure-dependent setting of the tensioning device and thus the load- or delivery pressure-dependent preload of the screw shell radially against the screw conveyor. This makes it possible to be able to clamp the screw casing against the screw as much as is necessary for the current delivery pressure. This reduces the friction and thus the wear of the screw shell. Finally, however, there is also the possibility of automatically adjusting the screw casing according to its wear in a screw pump.

Mit der Erfindung läßt sich die Einsatzdauer eines Schneckenmantels ganz entscheidend verlängern. Versuche haben ergeben, daß hier eine Verbesserung um mindestens den Faktor 2 gegeben ist. Wenn man bedenkt, wie umständlich das Auswechseln des Schneckenmantels ist, ist einsichtig, daß die Erfindung auch eine wesentliche Verbesserung im Umgang mit der Schneckenpumpe, insbesondere bzgl. der Wartung der Schneckenpumpe, mit sich bringt.With the invention, the service life of a snail shell can be extended significantly. Tests have shown that there is an improvement by at least a factor of 2 here. If one considers how laborious the replacement of the screw shell is, it is clear that the invention is also a significant improvement in handling the screw pump, in particular regarding the maintenance of the screw pump.

Gerade im Anfahrbereich einer Förderschnecke, in dem der Förderdruck noch gering ist, kann die Schneckenpumpe mit geringster Reibung zwischen Förderschnecke und Schneckenmantel betrieben werden. Bei niedrigem Förderdruck kann mit geringem Schneckenmanteldruck gearbeitet werden, was sich vorteilhafterweise auch auf eine Reduktion der zum Betreiben der Schneckenpumpe aufzubringenden Energie auswirkt.Especially in the start-up area of a screw conveyor, in which the delivery pressure is still low, the screw pump can be operated with minimal friction between the screw conveyor and the screw casing. If the delivery pressure is low, it is possible to work with a low screw jacket pressure, which advantageously also has an effect on a reduction in the energy to be used to operate the screw pump.

Grundsätzlich ist es möglich, den jeweiligen Förderdruck insbesondere meßtechnisch zu erfassen und damit die automatisch verstellbare Spannvorrichtung zu steuern. Die Ansteuerung der Spannvorrichtung erfolgt übrigens derart, daß sich die Spannung mit zunehmendem Förderdruck erhöht, wobei diese Abhängigkeit insbesondere proportional ist.In principle, it is possible to measure the respective delivery pressure, in particular by measuring technology, and thus to control the automatically adjustable clamping device. Incidentally, the tensioning device is activated in such a way that the tension increases with increasing delivery pressure, this dependence being particularly proportional.

Die Ermittlung des Förderdrucks kann auch anhand der momentanen Betriebsparameter der Antriebsvorrichtung (bei einem Elektromotor z.B. der Motorstrom) erfolgen.The delivery pressure can also be determined on the basis of the current operating parameters of the drive device (in the case of an electric motor, for example, the motor current).

Zweckmäßigerweise wird als Antriebsvorrichtung ein Hydraulikmotor eingesetzt; dies hat den Vorteil, daß der Hydraulikdruck und damit die Hydraulikflüssigkeit direkt zum Betätigen und Steuern der Spannvorrichtung eingesetzt werden kann, die dabei mindestens einen Hydraulik-Stempel aufweist, der zum Spannen bzw. Entspannen des Schneckenmantels entweder auf Zug bzw. Druck oder auf Druck bzw. Zug beansprucht wird (Druck- oder Zug-Stempel).A hydraulic motor is expediently used as the drive device; This has the advantage that the hydraulic pressure and thus the hydraulic fluid can be used directly for actuating and controlling the tensioning device, which has at least one hydraulic ram, which is used to tension or relax the screw shell either by tension or pressure or by pressure or Train is stressed (pressure or train stamp).

Vorzugsweise umfaßt die Spannvorrichtung mehrere Spannelemente (z.B. Hydraulik-Stempel), die längs der axialen Erstreckung des Schneckenmantels verteilt an der Spannvorrichtung angreifen. Damit ist es möglich, den Schneckenmantel örtlich variabel und über die gesamte axiale Länge unterschiedlich stark vorzuspannen, dem Schneckenmantel also ein Spannungsprofil aufzuprägen, was je nach Art des zu pumpenden Materials bzw. Mediums vorteilhaft ist. Mehrere Verstellelemente können aber auch mit gleicher Kraftauswirkung auf die Spannvorrichtung einwirken. Damit läßt sich ein konstantes Spannungsprofil über die gesamte axiale Länge des Schneckenmantels erreichen.The tensioning device preferably comprises a plurality of tensioning elements (e.g. hydraulic rams) which act on the tensioning device in a distributed manner along the axial extent of the screw shell. This makes it possible to preload the screw casing locally and to different extents over the entire axial length, that is to say to impart a tension profile to the screw casing, which is advantageous depending on the type of material or medium to be pumped. However, several adjustment elements can also act on the clamping device with the same force. This allows a constant tension profile to be achieved over the entire axial length of the screw shell.

Das oder die Verstellelemente der Verstellvorrichtung zum gesteuerten Verstellen der Spannvorrichtung können die unterschiedlichsten Ausgestaltungen aufweisen. Hydraulik-Stempel, motorisch antreibbare Spindeln oder motorisch bewegbare Hebelsysteme sind möglich.The adjustment element or elements of the adjustment device for the controlled adjustment of the tensioning device can have a wide variety of configurations. Hydraulic stamps, motor-driven spindles or motor-driven lever systems are possible.

Nachfolgend werden anhand der Figuren Ausführungsbeispiele der Erfindung näher erläutert. Im einzelnen zeigen:

Fig. 1
eine Seitenansicht einer Schneckenpumpe mit erfindungsgemäßer Spannvorrichtung und
Fign. 2 und 3

Alternativen für die Spannvorrichtung, die jeweils als Querschnittsansichten der Schneckenpumpe gemaß Fig. 1 entlang der Linie II-II dargestellt sind.
Exemplary embodiments of the invention are explained in more detail below with reference to the figures. In detail show:
Fig. 1
a side view of a screw pump with tensioning device according to the invention and
Fig. 2 and 3

Alternatives for the clamping device, which are each shown as cross-sectional views of the screw pump according to FIG. 1 along the line II-II.

In Fig. 1 ist in Seitenansicht eine Schneckenpumpe 10 dargestellt. Die Schneckenpumpe 10 ist mit einer im Schneckengehäuse 12 drehbar gelagerten Förderschnecke 14 versehen, die eine Achse und eine um die Achse herum verlaufende Schraubenwendel aufweist. Zum drehenden Antreiben der Förderschnecke 14 ist ein bei 16 angedeuteter Hydraulik-Motor als Antriebsvorrichtung vorgesehen. Das Gehäuse 12 der Schneckenpumpe 10 weist einen Einlaß 18 und einen Auslaß 20 auf, die an den beiden axialen Enden der Förderschnecke 14 angeordnet sind.1 shows a side view of a screw pump 10. The screw pump 10 is with a Auger housing 12 rotatably mounted screw conveyor 14, which has an axis and a screw spiral extending around the axis. A hydraulic motor, indicated at 16, is provided as the drive device for rotatingly driving the screw conveyor 14. The housing 12 of the screw pump 10 has an inlet 18 and an outlet 20, which are arranged at the two axial ends of the screw conveyor 14.

Der Aufbau des Gehäuses 12 wird nachfolgend anhand von Fig. 2 näher erläutert.The structure of the housing 12 is explained in more detail below with reference to FIG. 2.

Die Förderschnecke 14 ist abdichtend umschlossen von einem Schneckenmantel 22 aus elastischem Material. Insbesondere wird hierfür ein Kunststoffmaterial eingesetzt. Um den Schneckenmantel 22 herum ist als Spannvorrichtung eine Metallmanschette 24 angeordnet, die radial von außen gegen den Schneckenmantel 22 drückt und diesen wiederum zur dichten Anlage an der Förderschnecke 14 bringt. Die Spannmanschette 24 umschließt den Schneckenmantel 22 über nahezu 360°, ist also nicht gänzlich geschlossen. Im Bereich des offenen Endes der Spannmanschette 24 ist diese mit im wesentlichen radial abstehenden Flanschen 25,26 versehen, die mittels einer automatisch betätigbaren Verstellvorrichtung 28 zum Einstellen der auf den Schneckenmantel 22 wirkenden Spannung relativ zueinander bewegbar sind.The screw conveyor 14 is sealed by a screw shell 22 made of elastic material. In particular, a plastic material is used for this. A metal sleeve 24 is arranged around the screw casing 22 as a tensioning device, which presses radially from the outside against the screw casing 22 and in turn brings it tightly against the screw conveyor 14. The tensioning collar 24 encloses the screw shell 22 over almost 360 °, and is therefore not completely closed. In the area of the open end of the tensioning collar 24, this is provided with essentially radially projecting flanges 25, 26, which can be moved relative to one another by means of an automatically actuated adjusting device 28 for adjusting the tension acting on the screw shell 22.

Beim Fördern von Material durch die Schneckenpumpe beaufschlagt die Förderschnecke 14 das Material mit Druck. Diesem Druck muß der Schneckenmantel 22 standhalten. Aus diesem Grunde ist er von der Spannmanschette 24 umgeben. Je höher der Förderdruck ist, desto höher muß die Kraft sein, mit der der Schneckenmantel 22 gegen die Förderschnecke 14 radial gedrückt wird. Je stärker der Schneckenmantel 22 gegen die Förderschnecke 14 gedrückt ist, desto größer ist der Verschleiß des Schneckenmantels 22 durch Reibung einerseits mit der Förderschnecke 14 und andererseits mit dem zu fördernden bzw. zu pumpenden Material. Um den Verschleiß zu reduzieren, ist es zweckmäßig, den Schneckenmantel 22 dem jeweiligen abverlangten Förderdruck entsprechend stark gegen die Förderschnecke 14 vorzuspannen. Zu diesem Zweck ist bei der hier zu beschreibenden Schneckenpumpe 10 eine Automatik zum automatischen Nachstellen der Spannung der Spannmanschette vorgesehen.When conveying material through the screw pump, the screw conveyor 14 pressurizes the material. The screw casing 22 must withstand this pressure. For this reason, it is surrounded by the tensioning collar 24. The higher the delivery pressure, the higher the force with which the screw shell 22 is pressed radially against the feed screw 14. Each the more the screw shell 22 is pressed against the screw conveyor 14, the greater the wear of the screw shell 22 due to friction on the one hand with the screw conveyor 14 and on the other hand with the material to be conveyed or pumped. In order to reduce wear, it is expedient to preload the screw shell 22 strongly against the screw conveyor 14 in accordance with the required delivery pressure. For this purpose, an automatic system for automatically adjusting the tension of the tensioning collar is provided in the worm pump 10 to be described here.

Die oben angesprochene automatische Nachstellung erfolgt in Abhängigkeit von der Höhe des jeweiligen Förderdruckes. Ganz allgemein gesprochen, ist der Förderdruck bestimmt durch die Beschaffenheit des Materials (Viskosität) und durch den Querschnitt und die Länge des an den Auslaß des Schneckenpumpengehäuses 12 anschließbaren Förderschlauchs (in den Figuren nicht dargestellt). Ferner kann die Feststellung getroffen werden, daß der auf das pumpende Material wirkende Druck längs der Förderschnecke 14 variiert.The automatic adjustment mentioned above takes place depending on the level of the respective delivery pressure. Generally speaking, the delivery pressure is determined by the nature of the material (viscosity) and by the cross section and the length of the delivery hose (not shown in the figures) that can be connected to the outlet of the screw pump housing 12. Furthermore, it can be determined that the pressure acting on the pumping material varies along the screw conveyor 14.

Meßtechnisch oder aus Betriebsparametern der Schneckenpumpe, insbesondere aus den Betriebsparameter der Antriebsvorrichtung der Förderschnecke 14 wird der jeweilige Förderdruck bei der Schneckenpumpe 10 bestimmt. Je höher der Förderdruck ist, desto größer muß die auf den Schneckenmantel 22 wirkende Vorspannung durch die Spannmanschette 24 sein. Bei dem hier zu beschreibenden Ausführungsbeispiel wird als Antriebsvorrichtung ein Hydraulik-Motor 16 eingesetzt. Der Betriebsdruck dieses Hydraulik-Motors 16 ist proportional zum Förderdruck, so daß der Betriebsdruck direkt zur Ansteuerung geeigneter Verstellelemente der Verstellvorrichtung 28 ausgenutzt werden kann.In terms of measurement technology or from operating parameters of the screw pump, in particular from the operating parameters of the drive device of the screw conveyor 14, the respective delivery pressure at the screw pump 10 is determined. The higher the delivery pressure, the greater the pretension acting on the screw casing 22 due to the tensioning collar 24. In the exemplary embodiment to be described here, a hydraulic motor 16 is used as the drive device. The operating pressure of this hydraulic motor 16 is proportional to the delivery pressure, so that the operating pressure is more suitable for direct control Adjustment elements of the adjustment device 28 can be used.

Bei der in Fig. 2 dargestellten Variante der Verstellvorrichtung 28 weist diese Druck-Hydraulikstempel 30 auf, deren Zylinder 32 mit dem Flansch 25 der Spannmanschette 24 mechanisch verbunden sind. Dieser Flansch 25 ist dazu mit einem tangential zur Förderschnecke 14 verlaufenden Befestigungselement 34 verbunden, an dem der Stempelzylinder 32 bei 36 drehbar gelagert ist. Der aus dem Zylinder 32 herausragende Kolben 38 ist drehbar an einem Hebel 40 gelagert, dessen diesem Lagerungspunkt 42 abgewandtes Ende sich gegen den Flansch 25 der Spannmanschette 24 abstützt, mit dem der Stempel 32 über das Befestigungselement 34 verbunden ist. Der andere Flansch 26 ist über ein Zugelement 44 mit dem sich am Flansch 25 abstützenden Ende des Hebels 40 verspannt. Fährt nun mit steigendem Betriebsdruck des Hydraulik-Motors 16 der Kolben 38 aus, so wird der Hebel 40 um seinen Anlagepunkt 46 am Flansch 25 verschwenkt, wobei sich der Abstand zwischen diesem Ende des Hebels 40 und dem Flansch 26 ändert, was wiederum eine auf das Zugelement 44 wirkende Zugspannung zur Folge hat, die in eine radiale Stauchung der Spannmanschette 24 umgesetzt wird. Damit wird Druck auf den Schneckenmantel 22 ausgeübt.In the variant of the adjusting device 28 shown in FIG. 2, this has hydraulic pressure rams 30, the cylinders 32 of which are mechanically connected to the flange 25 of the tensioning collar 24. For this purpose, this flange 25 is connected to a fastening element 34 which extends tangentially to the screw conveyor 14 and on which the stamp cylinder 32 is rotatably mounted at 36. The piston 38 protruding from the cylinder 32 is rotatably mounted on a lever 40, the end of which, remote from this mounting point 42, is supported against the flange 25 of the clamping collar 24, to which the plunger 32 is connected via the fastening element 34. The other flange 26 is braced via a tension element 44 with the end of the lever 40 which is supported on the flange 25. Now moves with increasing operating pressure of the hydraulic motor 16 of the piston 38, the lever 40 is pivoted about its point of contact 46 on the flange 25, the distance between this end of the lever 40 and the flange 26 changes, which in turn is due to the Tension element 44 results in acting tensile stress, which is converted into a radial compression of the tensioning collar 24. This exerts pressure on the screw shell 22.

Anhand von Fig. 3 soll nachfolgend noch kurz auf eine Variante des Verstellmechanismus 28' eingegangen werden. Soweit sich die Elemente der Ausführungsbeispiele gemäß Fign. 2 und 3 gleichen, sind sie mit denselben Bezugszeichen versehen.3, a variant of the adjustment mechanism 28 'will be briefly discussed below. As far as the elements of the exemplary embodiments according to FIGS. 2 and 3 are the same, they are provided with the same reference numerals.

Im Unterschied zur Ausführungsform gemäß Fig. 2 wird bei der Alternativen nach Fig. 3 ein Hydraulik-Zugstempel 30' verwendet, dessen Zylinder 32' über ein Verbindungselement 34' mit dem Flansch 26 der Spannmanschette 24 verbunden ist. Der aus dem Zylinder 32' herausragende Kolben 38' ist mit einem Hebel 40' verbunden, der starr mit dem anderen Flansch 25 der Spannmanschette 24 verbunden ist. Mit zunehmendem Betriebsdruck des Hydraulik-Motors 16 wird die Kolbenstange 38' in den Zylinder 32' hineinbewegt. Dadurch wird der Hebel 40' auf den Zylinder 32' zubewegt und damit die beiden Flansche 25,26 aufeinanderzubewegt. Auf diese Weise erfolgt die Vorspannungskrafteinstellung der Spannmanschette 24.In contrast to the embodiment according to FIG. 2, a hydraulic tension ram is used in the alternative according to FIG. 3 30 'is used, the cylinder 32' of which is connected to the flange 26 of the clamping collar 24 via a connecting element 34 '. The piston 38 'protruding from the cylinder 32' is connected to a lever 40 'which is rigidly connected to the other flange 25 of the clamping collar 24. With increasing operating pressure of the hydraulic motor 16, the piston rod 38 'is moved into the cylinder 32'. As a result, the lever 40 'is moved towards the cylinder 32' and thus the two flanges 25, 26 are moved towards one another. The prestressing force setting of the tensioning collar 24 takes place in this way.

Claims (7)

Schneckenpumpe, insbesondere zum Pumpen von pastösen Massen, wie z.B. Baumaterialien, vorzugsweise angemachte Putzmischungen o.dgl., mit - einer Förderschnecke (14), - einer Antriebsvorrichtung (16) zum drehenden Antreiben der Förderschnecke (14), - einem die Förderschnecke (14) umgebenden Schneckenmantel (22) und - einer Spannvorrichtung (24) zum Spannen des Schneckenmantels (22) gegen die Förderschnecke (14), - wobei die Spannvorrichtung (24) den Schneckenmantel (22) mittels einer ansteuerbaren Verstellvorrichtung (28) gegen die Förderschnecke (14) spannt, dadurch gekennzeichnet, - daß die Verstellvorrichtung (28) in Abhängigkeit von dem Förderdruck der zu pumpenden Masse ansteuerbar ist, und zwar derart, daß die Kraft, mit der der Schneckenmantel (22) gegen die Förderschnecke (14) gespannt ist, mit zunehmendem Förderdruck ansteigt, insbesondere proportional zum Förderdruck ist. Screw pump, in particular for pumping pasty masses, such as building materials, preferably mixed plasters or the like, with - a screw conveyor (14), - A drive device (16) for rotatingly driving the screw conveyor (14), - A screw shell (22) surrounding the screw conveyor (14) and a tensioning device (24) for tensioning the screw shell (22) against the screw conveyor (14), - The tensioning device (24) tensions the screw casing (22) against the conveyor screw (14) by means of a controllable adjusting device (28), characterized, - That the adjusting device (28) can be controlled depending on the delivery pressure of the mass to be pumped, in such a way that the force with which the screw casing (22) is stretched against the screw conveyor (14) increases with increasing delivery pressure, in particular proportionally to the delivery pressure. Schneckenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß eine Meßvorrichtung zum Messen des Förderdrucks vorgesehen ist und daß die Verstellvorrichtung (28) in Abhängigkeit von dem Ausgangssignal der Meßvorrichtung steuerbar ist.Screw pump according to claim 1, characterized in that a measuring device for measuring the delivery pressure is provided and that the adjusting device (28) can be controlled as a function of the output signal of the measuring device. Schneckenpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine Ermittlungsvorrichtung zum Ermitteln des Förderdrucks aus den Betriebsparametern der Antriebsvorrichtung (16) vorgesehen ist und daß die Verstellvorrichtung (28) in Abhängigkeit von dem Ausgangssignal der Ermittlungsvorrichtung steuerbar ist.Screw pump according to claim 1 or 2, characterized in that a determining device for determining the delivery pressure from the operating parameters of the drive device (16) and that the adjustment device (28) can be controlled as a function of the output signal of the determination device. Schneckenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Antriebsvorrichtung (16) und die Verstellvorrichtung (28) jeweils hydraulisch betreibbar sind und daß der sich in der Antriebsvorrichtung (16) einstellende Hydraulikdruck direkt zur Ansteuerung der Verstellvorrichtung (28) genutzt wird.Screw pump according to claim 1, characterized in that the drive device (16) and the adjusting device (28) can each be operated hydraulically and that the hydraulic pressure which is set in the driving device (16) is used directly to control the adjusting device (28). Schneckenpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Verstellvorrichtung (28) mindestens ein Verstellelement (30) aufweist.Screw pump according to one of claims 1 to 4, characterized in that the adjusting device (28) has at least one adjusting element (30). Schneckenpumpe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Verstellvorrichtung (28) mehrere Verstellelemente (30) aufweist, die in axialer Erstreckung der Förderschnecke (14), insbesondere gleichmäßig, verteilt angeordnet sind.Screw pump according to one of claims 1 to 5, characterized in that the adjusting device (28) has a plurality of adjusting elements (30) which are arranged in a distributed manner, in particular uniformly, in the axial extent of the screw conveyor (14). Schneckenpumpe nach Anspruch 6, dadurch gekennzeichnet, daß die Verstellelemente (30) unterschiedlich große Kräfte auf die Spannvorrichtung (24) ausüben.Screw pump according to claim 6, characterized in that the adjusting elements (30) exert different forces on the tensioning device (24).
EP96105517A 1995-04-08 1996-04-06 Screw pump Expired - Lifetime EP0740075B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19513452 1995-04-08
DE19513452 1995-04-08

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EP0740075A1 true EP0740075A1 (en) 1996-10-30
EP0740075B1 EP0740075B1 (en) 1999-07-28

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EP96105517A Expired - Lifetime EP0740075B1 (en) 1995-04-08 1996-04-06 Screw pump

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EP (1) EP0740075B1 (en)
AT (1) ATE182658T1 (en)
DE (2) DE29605270U1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011445A (en) * 1957-11-13 1961-12-05 Robbin & Myers Inc Helical gear pump with by-pass
FR1486745A (en) * 1966-07-13 1967-06-30 Worm and eccentric pump
DE2237563A1 (en) * 1972-07-31 1974-02-21 Heinz Krieger HYDRO CLAMPING BLOCK FOR AUGER MAENTEL
DE8609300U1 (en) * 1986-04-05 1986-05-22 Viesel, Manfred, 7432 Bad Urach Clamping device for screw jackets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011445A (en) * 1957-11-13 1961-12-05 Robbin & Myers Inc Helical gear pump with by-pass
FR1486745A (en) * 1966-07-13 1967-06-30 Worm and eccentric pump
DE2237563A1 (en) * 1972-07-31 1974-02-21 Heinz Krieger HYDRO CLAMPING BLOCK FOR AUGER MAENTEL
DE8609300U1 (en) * 1986-04-05 1986-05-22 Viesel, Manfred, 7432 Bad Urach Clamping device for screw jackets

Also Published As

Publication number Publication date
DE29605270U1 (en) 1996-05-30
EP0740075B1 (en) 1999-07-28
ATE182658T1 (en) 1999-08-15
DE59602516D1 (en) 1999-09-02

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