EP0740075A1 - Pompe à vis - Google Patents

Pompe à vis 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)
English (en)
Other versions
EP0740075B1 (fr
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
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 Koch Marmorit GmbH filed Critical Koch Marmorit GmbH
Publication of EP0740075A1 publication Critical patent/EP0740075A1/fr
Application granted granted Critical
Publication of EP0740075B1 publication Critical patent/EP0740075B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Valve Device For Special Equipments (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Rotary Pumps (AREA)
  • Control Of Fluid Pressure (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Reciprocating Pumps (AREA)
  • Screw Conveyors (AREA)
EP96105517A 1995-04-08 1996-04-06 Pompe à vis Expired - Lifetime EP0740075B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
EP0740075A1 true EP0740075A1 (fr) 1996-10-30
EP0740075B1 EP0740075B1 (fr) 1999-07-28

Family

ID=7759309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96105517A Expired - Lifetime EP0740075B1 (fr) 1995-04-08 1996-04-06 Pompe à vis

Country Status (3)

Country Link
EP (1) EP0740075B1 (fr)
AT (1) ATE182658T1 (fr)
DE (2) DE29605270U1 (fr)

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 (fr) * 1966-07-13 1967-06-30 Pompe à vis sans fin et excentrique
DE2237563A1 (de) * 1972-07-31 1974-02-21 Heinz Krieger Hydro-spannblock fuer schneckenmaentel
DE8609300U1 (de) * 1986-04-05 1986-05-22 Viesel, Manfred, 7432 Bad Urach Spannvorrichtung für Schneckenmäntel

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 (fr) * 1966-07-13 1967-06-30 Pompe à vis sans fin et excentrique
DE2237563A1 (de) * 1972-07-31 1974-02-21 Heinz Krieger Hydro-spannblock fuer schneckenmaentel
DE8609300U1 (de) * 1986-04-05 1986-05-22 Viesel, Manfred, 7432 Bad Urach Spannvorrichtung für Schneckenmäntel

Also Published As

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

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