EP0209099A1 - Stator pour pompe à vis - Google Patents

Stator pour pompe à vis Download PDF

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Publication number
EP0209099A1
EP0209099A1 EP86109623A EP86109623A EP0209099A1 EP 0209099 A1 EP0209099 A1 EP 0209099A1 EP 86109623 A EP86109623 A EP 86109623A EP 86109623 A EP86109623 A EP 86109623A EP 0209099 A1 EP0209099 A1 EP 0209099A1
Authority
EP
European Patent Office
Prior art keywords
lining
axis
stator
thickness
concave
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
EP86109623A
Other languages
German (de)
English (en)
Other versions
EP0209099B1 (fr
Inventor
Eugen Unterstrasser
Johann Kreidl
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.)
Netzsch Pumpen and Systeme GmbH
Original Assignee
Netzsch Pumpen and Systeme 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 Netzsch Pumpen and Systeme GmbH filed Critical Netzsch Pumpen and Systeme GmbH
Priority to AT86109623T priority Critical patent/ATE39731T1/de
Publication of EP0209099A1 publication Critical patent/EP0209099A1/fr
Application granted granted Critical
Publication of EP0209099B1 publication Critical patent/EP0209099B1/fr
Expired 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 a stator for eccentric screw pumps with a rigid tubular jacket, the inner surface of which forms a multi-thread, and an elastic lining, which bears against the jacket over the entire axial length, is symmetrical with respect to the central longitudinal axis of the stator and has an inner surface which also forms a multi-start thread, in cross-section it consists of a number of sections near the axis that is equal to the number of threads of the thread and an equally large number of concave bends that connect to the sections near the axis with continuous transitions, the lining of the concave bends each having a minimum thickness.
  • the rigid tubular jacket is circular-cylindrical inside and out and accordingly the outer surface of the lining is circular-cylindrical.
  • the inner surface of the lining is double-threaded and has an essentially oval cross-section with two sections near the axis and two semicircular arches which connect the sections near the axis to one another.
  • the two sections close to the axis are slightly convex, that is to say they are curved towards the central longitudinal axis of the stator; this is said to provide a better seal between the stator and a rotor can be achieved, which has a circular cross section and is coiled coherently.
  • the inner surface of the rigid tubular jacket and the outer surface of the elastic lining have a shape which corresponds approximately to the double-coiled inner surface of the lining, but the near-axis Sections of the inner surface of the lining, where the highest sliding speeds of the associated rotor occur, in turn have convex elevations which are curved inwards and the lining on these sections near the axis also has elevations which protrude radially outwards, the thickness of which is of the order of magnitude of ten greater than the thickness of the inner elevations.
  • the outer elevations of the lining are received in corresponding hollows on the inside of the rigid tubular jacket. This should result in a more uniform clamping of the rotor in the stator and a better efficiency and at the same time a longer service life.
  • stator (DE-OS 28 17 280) has an elastic lining, the inner wall of which is also twisted and the outer wall approximates a corresponding two-helix, but is divided into several axially adjacent sections, the axial extension of which is one eighth each full helix and each have a cylindrical surface form an oval plan. If one cuts such a stator section in a plane normal to the central longitudinal axis of the stator, which lies in the center of the section in question, the straight sections of their oval outer surface extend parallel to the straight sections of the inner surface.
  • the invention is based on the knowledge that a considerable part of the wear occurring on the lining is related to the constantly recurring formation and rolling over of these beads.
  • the thickness maxima are therefore no longer in the central region of each of the sections near the axis in which the sliding speed of the rotor has a maximum, but the thickness maxima of the lining are laid on the edges of the sections near the axis or even in the initial areas of the adjacent concave arches, with the result that the lining in the middle of each of its axially proximate sections has a thickness which is less than the maximum thickness.
  • the result of this is that the rotor can roll over the bulge that has built up in front of it more easily at the entry into one of the concave arches of the inner surface than in known stators of the generic type, thereby protecting the lining.
  • the inner surface of the casing and the inner surface of the lining are geometrically similar to one another, but are rotated by 5 to 15 ° relative to one another about the central longitudinal axis.
  • the lining has only one end of each axis near the axis cut a thickness maximum; consequently, the rotor may only rotate in a certain direction so that it can roll over the bead of the lining which is forming in front of it at a maximum thickness.
  • the definition of a certain direction of rotation is not unusual for eccentric screw pumps and does not limit their possible use.
  • the thickness of the lining has a minimum in the middle of its concave arches and an additional minimum in the middle of each section close to the axis. In this way it is ensured that the bulge of the lining which forms in front of the rotor is displaced in each of the two possible directions of rotation of the rotor when it enters a concave arc, without unnecessary flexing work and heating occurring.
  • This embodiment of the invention can be further developed in that the thickness of the lining at the additional minima is not greater than at the minima in the middle of the concave arches.
  • a tubular jacket 10 which consists of rigid material, such as cast steel or aluminum.
  • the jacket 10 is overall symmetrical with respect to a central longitudinal axis A, is cylindrical on the outside and has an inner surface which is coiled in two directions and is therefore oval in any cross section.
  • the inner surface includes two straight sections 12 which are close to the axis and which extend parallel to a main axis 14 between two transverse axes 16 and are connected to one another by semicircular arches 18.
  • the jacket 10 encloses a lining 20 made of an elastomer, the outer surface of which rests without gaps on the inner surface 12, 18 of the jacket 10, that is to say, just like this inner surface, is coiled with two threads and is thus oval in any cross section.
  • the lining 20 has an inner surface which is also oval in any cross section and has two sections 22 which are just near the axis and which extend parallel to a main axis 24.
  • the sections 22 close to the axis could also be slightly convex.
  • the two straight sections 22 near the axis are delimited by two transverse axes 26 and connected to one another by two semicircular arches 28.
  • Each of the transverse axes 26 intersects the adjacent transverse axis 16 at an angle of likewise 10 °.
  • the inner surface 22, 28 of the lining 20 has two vertices I and V, in which it is cut by the main axis 24, as well as four transitions II, IV, VI and VIII, in which it extends from the transverse axes 26, as in any other cross section is cut.
  • the axially close sections 22 extend between the transitions II and IV or VI and VIII and each have a center point III or VII.
  • the concave arches 28 extend between the transitions VIII and II or IV and VI and each have one of the apices I or V as the center.
  • the outer and inner surfaces of the lining 20 are geometrically similar to one another, but limit because of the twist the main axes 14 and 24 zones of different thickness.
  • the lining 20 has two thickness minima 30, which - viewed in a clockwise direction - are just before the vertices I and V, and two thickness maxima 32, which are located just behind the transitions VI and II, respectively between the transverse axes 16 and 26.
  • a single-start rotor 34 of circular cross section with radial preload is inserted into the lining 20.
  • the rotor 34 rotates in the direction of the arrow; its greatest sliding speed v g occurs at point VII.
  • This sliding speed v g is composed of the translation of the rotor 34 at the speed v t and the rotation of the rotor about its own axis.
  • the lining 20 has a double-helical inner surface 22, 28, which as such corresponds to that shown in FIG. 1.
  • this inner surface 22, 28 is not twisted with respect to the inner surface of the jacket 10, which is also coiled with two threads, and is not geometrically similar.
  • the inner surface of the casing 10, against which the outer surface of the lining 20 rests without gaps, has two opposing convex regions 12 of approximately sinusoidal shape and two concave arches 18 which are approximately semicircular but are somewhat flattened in the region of the main axis 14.
  • the elastic lining 20 has two thickness minima 30 which lie on the coinciding main axes 14 and 24, four thickness maxima 32 which lie in pairs on the likewise coincident transverse axes 16 and 26, and two additional thickness minima 36 at the centers III and VII of the regions 22 near the axis .
EP86109623A 1985-07-17 1986-07-14 Stator pour pompe à vis Expired EP0209099B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86109623T ATE39731T1 (de) 1985-07-17 1986-07-14 Stator fuer exzenterschneckenpumpen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3525529 1985-07-17
DE3525529A DE3525529C1 (de) 1985-07-17 1985-07-17 Stator fuer Exzenterschneckenpumpen

Publications (2)

Publication Number Publication Date
EP0209099A1 true EP0209099A1 (fr) 1987-01-21
EP0209099B1 EP0209099B1 (fr) 1989-01-04

Family

ID=6276006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109623A Expired EP0209099B1 (fr) 1985-07-17 1986-07-14 Stator pour pompe à vis

Country Status (6)

Country Link
US (1) US4863359A (fr)
EP (1) EP0209099B1 (fr)
JP (1) JPH071035B2 (fr)
AT (1) ATE39731T1 (fr)
BR (1) BR8603356A (fr)
DE (2) DE3525529C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0459740A1 (fr) * 1990-05-31 1991-12-04 Mono Pumps Limited Pompe à vis excentrée
GB2272730A (en) * 1992-11-11 1994-05-25 Arnold Jaeger Eccentric screw pump

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5120204A (en) * 1989-02-01 1992-06-09 Mono Pumps Limited Helical gear pump with progressive interference between rotor and stator
US5832604A (en) * 1995-09-08 1998-11-10 Hydro-Drill, Inc. Method of manufacturing segmented stators for helical gear pumps and motors
DE19950258A1 (de) * 1999-10-18 2001-04-26 Wilhelm Kaechele Gmbh Elastome Stator mit stabilen Stirnring
US6604921B1 (en) 2002-01-24 2003-08-12 Schlumberger Technology Corporation Optimized liner thickness for positive displacement drilling motors
CA2543554C (fr) * 2003-10-27 2010-03-09 Dyna-Drill Technologies, Inc. Contour asymetrique d'une chemise elastomere sur des aretes dans un stator a section de puissance type moineau
US8888474B2 (en) 2011-09-08 2014-11-18 Baker Hughes Incorporated Downhole motors and pumps with asymmetric lobes
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
JP7138383B1 (ja) * 2022-01-18 2022-09-16 兵神装備株式会社 一軸偏心ねじポンプ
JP7138382B1 (ja) * 2022-01-18 2022-09-16 兵神装備株式会社 一軸偏心ねじポンプ
JP7199128B1 (ja) * 2022-01-18 2023-01-05 兵神装備株式会社 一軸偏心ねじポンプ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB970619A (en) * 1962-01-17 1964-09-23 Robbins & Myers Helical gear pump with stator compression
GB1181193A (en) * 1967-04-19 1970-02-11 Seeberger K G Maschinen Und Ge Improvements in or relating to Worm Pumps
DE2017620A1 (de) * 1970-04-13 1971-11-04 Gummi-Jäger KG, 3000 Hannover Exzenterschneckenpumpe
DE2408186A1 (de) * 1974-02-20 1975-08-21 Lonza Werke Gmbh Exzenterschneckenpumpe
DE2817280A1 (de) * 1978-04-20 1979-10-25 Streicher Foerdertech Stator fuer exzenterschneckenpumpen
DE3147663A1 (de) * 1981-12-02 1983-06-09 Gummi-Jäger KG GmbH & Cie, 3000 Hannover Stator fuer schneckenpumpen
DE2709502C2 (de) * 1976-03-09 1984-12-20 Société Générale de Mécanique et de Métallurgie (S.G.M.M.), Vanves Stator für Schraubenpumpen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653897A1 (de) * 1967-04-19 1971-07-01 Seeberger Kg Maschinen Und Ger Schneckenpumpe
DE1653899A1 (de) * 1967-08-12 1971-09-30 Seeberger Kg Maschinen Und Ger Schneckenpumpe
JPS6017954B2 (ja) * 1981-04-23 1985-05-08 兵神装備株式会社 一軸偏心ねじポンプ
US4676725A (en) * 1985-12-27 1987-06-30 Hughes Tool Company Moineau type gear mechanism with resilient sleeve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB970619A (en) * 1962-01-17 1964-09-23 Robbins & Myers Helical gear pump with stator compression
GB1181193A (en) * 1967-04-19 1970-02-11 Seeberger K G Maschinen Und Ge Improvements in or relating to Worm Pumps
DE2017620A1 (de) * 1970-04-13 1971-11-04 Gummi-Jäger KG, 3000 Hannover Exzenterschneckenpumpe
DE2408186A1 (de) * 1974-02-20 1975-08-21 Lonza Werke Gmbh Exzenterschneckenpumpe
DE2709502C2 (de) * 1976-03-09 1984-12-20 Société Générale de Mécanique et de Métallurgie (S.G.M.M.), Vanves Stator für Schraubenpumpen
DE2817280A1 (de) * 1978-04-20 1979-10-25 Streicher Foerdertech Stator fuer exzenterschneckenpumpen
DE3147663A1 (de) * 1981-12-02 1983-06-09 Gummi-Jäger KG GmbH & Cie, 3000 Hannover Stator fuer schneckenpumpen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0459740A1 (fr) * 1990-05-31 1991-12-04 Mono Pumps Limited Pompe à vis excentrée
US5145343A (en) * 1990-05-31 1992-09-08 Mono Pumps Limited Helical gear pump and stator with constant rubber wall thickness
GB2272730A (en) * 1992-11-11 1994-05-25 Arnold Jaeger Eccentric screw pump
US5358390A (en) * 1992-11-11 1994-10-25 Jaeger Arnold Eccentric screw pump
GB2272730B (en) * 1992-11-11 1995-09-27 Arnold Jaeger Eccentric screw pump

Also Published As

Publication number Publication date
US4863359A (en) 1989-09-05
JPH071035B2 (ja) 1995-01-11
JPS6220684A (ja) 1987-01-29
DE3661645D1 (en) 1989-02-09
DE3525529C1 (de) 1986-08-07
ATE39731T1 (de) 1989-01-15
BR8603356A (pt) 1987-02-24
EP0209099B1 (fr) 1989-01-04

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