EP0448941A2 - Stator pour une pompe excentrique à vis - Google Patents

Stator pour une pompe excentrique à vis Download PDF

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Publication number
EP0448941A2
EP0448941A2 EP91101831A EP91101831A EP0448941A2 EP 0448941 A2 EP0448941 A2 EP 0448941A2 EP 91101831 A EP91101831 A EP 91101831A EP 91101831 A EP91101831 A EP 91101831A EP 0448941 A2 EP0448941 A2 EP 0448941A2
Authority
EP
European Patent Office
Prior art keywords
stator
thread
profile
rubber
jacket
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
EP91101831A
Other languages
German (de)
English (en)
Other versions
EP0448941B1 (fr
EP0448941A3 (en
Inventor
Heinz Gruber
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.)
GD-ANKER GRUBER-DUEBEL-ANKER GMBH
Original Assignee
Gd-Anker Gruber-Duebel-Anker 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 Gd-Anker Gruber-Duebel-Anker GmbH filed Critical Gd-Anker Gruber-Duebel-Anker GmbH
Publication of EP0448941A2 publication Critical patent/EP0448941A2/fr
Publication of EP0448941A3 publication Critical patent/EP0448941A3/de
Application granted granted Critical
Publication of EP0448941B1 publication Critical patent/EP0448941B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
    • F04C2/1075—Construction of the stationary member

Definitions

  • the invention relates to stators for eccentric screw pumps according to the preambles of claims 1 and 2.
  • Eccentric screw pumps are known in manifold forms and serve to convey, for example, solid-liquid mixtures such as mortar, sludge or the like. They consist of a stator, which on the inside carries a thread-like profile made of a rubber-elastic material, in which a rotor made of steel, which also has a thread-like profile on the outside, rotates eccentrically. Between the thread profiles of the stator and the rotor, mutually sealed conveying spaces for the medium to be conveyed are formed, which are moved during the rotation of the rotor in the conveying direction, during which movement not their volume, but their shape and position change continuously.
  • the pressures or delivery heads that can be reached on the outlet side depend essentially on the quality the seal between the mentioned conveying spaces and thus, among other things, on the stiffness or dimensional stability of the rubber profile of the stator.
  • the latter is usually set via a certain preload, ie diameter difference between the rotor and the stator.
  • a comparatively soft rubber material in the stator profile is considered to be more wear-resistant than a relatively harder one - the former, however, requires significantly higher prestresses to achieve the same initial pressures, so that after rubber is considered an incompressible material, comparatively strong deformations of the stator profile would result .
  • Stators for eccentric screw pumps usually consist of a cylindrical metallic jacket, into which an insert part consisting of a rubber material is introduced by means of a spraying process, the inside of which, for example, has the shape of a double-start, for Interaction with the rotor has a specific thread profile.
  • the expected shrinkage in rubber materials is dependent on the respective wall thickness of the profile, so that with a view to achieving low manufacturing tolerances, special additional measures are required in order to maintain the stated tolerances despite the locally different wall thicknesses that can be traced back to the thread profile mentioned.
  • the entire thread profile lining the inside of the stator or the insert part arranged here is characterized by a uniform wall thickness of a rubber material, so that there is practically the same shrinkage at every point of the stator lining.
  • the small dimensional tolerances that can be traced back to a production-oriented design simplify the manufacturing process.
  • the respective layer thicknesses of the insert parts can be chosen to be as small as possible based on the required prestress, the elasticity of the material and an allowable degree of wear. Since the material costs, for example, of raw rubber on the one hand and steel or iron on the other hand differ considerably, the stator according to the invention is characterized by significant savings in the relatively more expensive rubber material.
  • the construction according to the invention also makes a contribution to waste disposal.
  • the small layer thicknesses of the rubber insert result in correspondingly small possible deformation paths, which, in conjunction with the profiled design of the casing or the metallic windings embedded in the rubber material, have the effect that even with comparatively small deformation paths there is a strong stiffening of the rubber profile, so that there is a correspondingly high resistance to pressure-side stresses.
  • claims 7 to 10 are directed to an advantageous embodiment of the subject matter of the invention, namely to the extent that only part of the stator length is formed in such a way that the aforementioned thin, uniform layer thicknesses of the rubber material result, whereas the remaining remaining part of the stator is conventional Senses can be formed.
  • a conventional insert part without the mentioned system of metallic windings or a smooth-walled cylindrical jacket part is thus provided.
  • conventional steel rotors are used, different deformation capabilities are achieved in the resulting two sections of the stator in such a way that the required high rigidity and thus sealing effect is always available on the pressure side.
  • This system can of course be designed in a variety of ways, for example by appropriately dimensioning the cross-section of the embedded windings or the deformation of the sheath, more than two sections can be provided over the course of a stator length, which sections are distinguished by different deformability of the rubber material, namely that there is a gradually increasing stiffness of the rubber material from the suction side to the pressure side.
  • FIG. 1 denotes the steel jacket of a stator, the contour of which is deformed, for example, in the manner of a two-start high-helix thread.
  • the thread profile can be created in any way.
  • the jacket 1 carries on its inside an insert 2 consisting of a rubber-elastic material, which is in a preferably non-detachable connection to the inside surface of the jacket, for example vulcanized to the latter.
  • the insert part 2 is dimensioned such that the entire inner surface of the jacket 1 is covered with a uniform layer thickness 3.
  • the result on the inside of the jacket 1 is a contour consisting of the rubber-elastic material in the manner of a two-start thread, which can be used as a pump stator.
  • the layer thickness 3 should be at least 5 mm with an acceptable wear of 2 mm. This comparatively small layer thickness is associated with the profiled design of the jacket 1 a number of advantageous effects.
  • the outlet pressure that can be achieved with eccentric screw pumps and thus their front height depends crucially on the quality of the sealing of the delivery spaces for the respective medium that form between the thread profiles of the rotor and stator.
  • This seal is usually produced by a certain pre-tension between the rotor made of steel and the rubber-elastic material of the stator windings and results in a certain deformation of the stator profile in the area of the seals of the mentioned delivery spaces. The purpose of this deformation is to increase the resistance to deformation due to the stresses that occur on the pressure side.
  • Fig. 2 shows a stator with a smooth cylindrical jacket 4, which in turn consists of steel and serves to receive an insert 5 made of a rubber-elastic material.
  • At 6 is a system of turns Designated from steel wires, which are adapted to the shape of the turns of the insert 5, thus for example form the shape of a double-start high-helix thread and which are welded to the jacket 4 at one or both ends, as indicated at points 7.
  • the turns 6 are completely embedded in the rubber-elastic material, in such a way that, based on the inside of the jacket 5, there are largely uniform layer thicknesses 8 of the rubber material.
  • the windings 6 consist of steel wires of circular cross section.
  • the cross-sectional shape of the steel wires can of course also be adapted to the cross-sectional shape of the individual threads of the thread profile in order to further even out the layer thickness of the rubber. It can be seen that due to the complete embedding of the turns 20 in the rubber-elastic material corrosion problems are avoided.
  • the insert 5 is in the rest of the jacket in preferably non-detachable connection and is vulcanized, for example.
  • the advantages resulting from the uniform or approximately uniform layer thickness of the rubber material correspond to those of the exemplary embodiment according to FIG. 1, so that reference is made to the statements made there.
  • Fig. 3 shows a further embodiment of a pump stator, consisting of a smooth cylindrical jacket 4 and an insert part 9 consisting of a rubber-elastic material, which can be divided into two sections, namely a first section, with a system of windings 10 consisting of steel wire is provided and a second section that shows no windings or other reinforcements that are functionally comparable to these.
  • the ends of the turns 10 are in turn welded to the jacket 4, as indicated at points 11.
  • the connection of the insert part 9 to the jacket 4 is again carried out in the same way as in the exemplary embodiments described above and, just as in FIG. 2, the introduction of the windings 10 in this section of the stator is aimed at achieving a layer thickness of the rubber material that is as uniform as possible.
  • the arrow 12 indicates the direction of conveyance of the stator, by dividing it into the two sections mentioned above, it is achieved that in the first section provided with turns there are substantially fewer possibilities of deformation of the rubber material than in the second section.
  • the stiffening and thus the compressive strength of the rubber material are significantly higher and the individual conveying spaces which form between the windings of the rotor and the stator are sealed well.
  • the pretension is lower due to the greater layer thicknesses there and thus greater deformability of the rubber material, which is not problematic, however, since there are only slight pressure differences in this area between the individual delivery rooms and the quality of the sealing of the delivery rooms mentioned in this section only is of minor importance. Since the high compressive strength is thus restricted to the area of the stator, in which it is important with regard to the required sealing and thus the achievable delivery head, this becomes simultaneously in the operation of Eccentric screw pump torque significantly reduced compared to such an embodiment, in which a uniform preload is set over the entire length.
  • the section of the pump stator which is equipped with steel wire reinforcements or windings in the sense of the invention, can make up a proportion of approximately 50% based on the length of the entire stator.
  • non-tensionable stators are used, so that their practical handling is very simple, in particular on the construction site.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP91101831A 1990-03-01 1991-02-09 Stator pour une pompe excentrique à vis Expired - Lifetime EP0448941B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4006339A DE4006339C2 (de) 1990-03-01 1990-03-01 Stator für eine Exzenterschneckenpumpe
DE4006339 1990-03-01

Publications (3)

Publication Number Publication Date
EP0448941A2 true EP0448941A2 (fr) 1991-10-02
EP0448941A3 EP0448941A3 (en) 1992-06-24
EP0448941B1 EP0448941B1 (fr) 1996-05-15

Family

ID=6401145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91101831A Expired - Lifetime EP0448941B1 (fr) 1990-03-01 1991-02-09 Stator pour une pompe excentrique à vis

Country Status (5)

Country Link
US (1) US5145342A (fr)
EP (1) EP0448941B1 (fr)
JP (1) JP2950629B2 (fr)
AT (1) ATE138160T1 (fr)
DE (2) DE4006339C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2255594A (en) * 1990-12-20 1992-11-11 Drilex Syst Inc Downhole drilling motor.
GB2244517B (en) * 1990-05-31 1994-05-04 Mono Pumps Ltd Helical gear pump and stator
CN103216449A (zh) * 2012-01-18 2013-07-24 熊荣华 线性轨迹、封闭截面的管腔流体动力技术

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6183226B1 (en) 1986-04-24 2001-02-06 Steven M. Wood Progressive cavity motors using composite materials
US5611397A (en) * 1994-02-14 1997-03-18 Wood; Steven M. Reverse Moineau motor and centrifugal pump assembly for producing fluids from a well
DE4111166C2 (de) * 1991-04-06 1999-03-18 Gummi Jaeger Kg Gmbh & Cie Exzenterschneckenpumpe
US5759019A (en) * 1994-02-14 1998-06-02 Steven M. Wood Progressive cavity pumps using composite materials
US6102681A (en) * 1997-10-15 2000-08-15 Aps Technology Stator especially adapted for use in a helicoidal pump/motor
DE19754818A1 (de) * 1997-12-10 1999-06-17 Artemis Kautschuk Kunststoff Verfahren zur Herstellung von Elastomerstatoren für Exzenterschneckenpumpen
US6543132B1 (en) 1997-12-18 2003-04-08 Baker Hughes Incorporated Methods of making mud motors
DE19821867A1 (de) * 1998-05-15 1999-11-18 Artemis Kautschuk Kunststoff Nach dem Moineau-Prinzip arbeitende Maschine, insbesondere Bohrmotor für Tiefbohrungen
US6309195B1 (en) * 1998-06-05 2001-10-30 Halliburton Energy Services, Inc. Internally profiled stator tube
WO2005042910A2 (fr) * 2003-10-27 2005-05-12 Dyna-Drill Technologies, Inc. Contour asymetrique d'une chemise elastomere sur des aretes dans un stator a section de puissance type moineau
DE102004038477B3 (de) * 2004-08-07 2005-10-06 Netzsch-Mohnopumpen Gmbh Exzenterschneckenpumpe
US7214042B2 (en) * 2004-09-23 2007-05-08 Moyno, Inc. Progressing cavity pump with dual material stator
US7517202B2 (en) * 2005-01-12 2009-04-14 Smith International, Inc. Multiple elastomer layer progressing cavity stators
US7396220B2 (en) * 2005-02-11 2008-07-08 Dyna-Drill Technologies, Inc. Progressing cavity stator including at least one cast longitudinal section
CN100507274C (zh) * 2006-11-03 2009-07-01 江苏大学 电动机螺杆泵
CN101512046B (zh) 2007-01-24 2011-08-10 哈利伯顿能源服务公司 用于螺杆装置的电铸定子管
US7950914B2 (en) * 2007-06-05 2011-05-31 Smith International, Inc. Braze or solder reinforced Moineau stator
US7878774B2 (en) * 2007-06-05 2011-02-01 Smith International, Inc. Moineau stator including a skeletal reinforcement
US8182252B2 (en) * 2007-10-30 2012-05-22 Moyno, Inc. Progressing cavity pump with split stator
US8215014B2 (en) * 2007-10-31 2012-07-10 Moyno, Inc. Method for making a stator
US20110058930A1 (en) * 2009-09-04 2011-03-10 Robbins & Myers Energy Systems L.P. Motor/pump with spiral wound stator tube
US9393648B2 (en) 2010-03-30 2016-07-19 Smith International Inc. Undercut stator for a positive displacment motor
US10450800B2 (en) * 2011-03-08 2019-10-22 Schlumberger Technology Corporation Bearing/gearing section for a PDM rotor/stator
US10527037B2 (en) * 2016-04-18 2020-01-07 Baker Hughes, A Ge Company, Llc Mud motor stators and pumps and method of making
TW202237982A (zh) * 2021-01-19 2022-10-01 日商武藏工業股份有限公司 流體移送裝置及具備該裝置之塗佈裝置暨塗佈方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3084631A (en) * 1962-01-17 1963-04-09 Robbins & Myers Helical gear pump with stator compression
US3139035A (en) * 1960-10-24 1964-06-30 Walter J O'connor Cavity pump mechanism
GB1150339A (en) * 1966-03-15 1969-04-30 Karl Schlecht Improvements in or relating to Screw Pumps
FR1592149A (fr) * 1967-11-02 1970-05-11
DE2713468A1 (de) * 1977-03-26 1978-09-28 Allweiler Ag Stator fuer exzenterschneckenpumpen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527673A (en) * 1947-02-28 1950-10-31 Robbins & Myers Internal helical gear pump
US3499389A (en) * 1967-04-19 1970-03-10 Seeberger Kg Worm pump
DE1703602A1 (de) * 1968-06-15 1972-04-20 Seeberger Kg Maschinen & Gerae Schneckenpumpe
DE3304751C2 (de) * 1983-02-11 1985-08-01 Kunststofftechnik Obernkirchen GmbH & Co KG, 3063 Obernkirchen Exzenterschneckenpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139035A (en) * 1960-10-24 1964-06-30 Walter J O'connor Cavity pump mechanism
US3084631A (en) * 1962-01-17 1963-04-09 Robbins & Myers Helical gear pump with stator compression
GB1150339A (en) * 1966-03-15 1969-04-30 Karl Schlecht Improvements in or relating to Screw Pumps
FR1592149A (fr) * 1967-11-02 1970-05-11
DE2713468A1 (de) * 1977-03-26 1978-09-28 Allweiler Ag Stator fuer exzenterschneckenpumpen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2244517B (en) * 1990-05-31 1994-05-04 Mono Pumps Ltd Helical gear pump and stator
GB2255594A (en) * 1990-12-20 1992-11-11 Drilex Syst Inc Downhole drilling motor.
GB2255594B (en) * 1990-12-20 1994-07-20 Drilex Syst Inc Downhole drilling motor
CN103216449A (zh) * 2012-01-18 2013-07-24 熊荣华 线性轨迹、封闭截面的管腔流体动力技术

Also Published As

Publication number Publication date
DE4006339C1 (en) 1991-08-01
ATE138160T1 (de) 1996-06-15
DE59107796D1 (de) 1996-06-20
EP0448941B1 (fr) 1996-05-15
JP2950629B2 (ja) 1999-09-20
US5145342A (en) 1992-09-08
JPH0742679A (ja) 1995-02-10
DE4006339C2 (de) 1994-08-04
EP0448941A3 (en) 1992-06-24

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