EP0882891B1 - Pompe Moineau - Google Patents

Pompe Moineau Download PDF

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Publication number
EP0882891B1
EP0882891B1 EP98110070A EP98110070A EP0882891B1 EP 0882891 B1 EP0882891 B1 EP 0882891B1 EP 98110070 A EP98110070 A EP 98110070A EP 98110070 A EP98110070 A EP 98110070A EP 0882891 B1 EP0882891 B1 EP 0882891B1
Authority
EP
European Patent Office
Prior art keywords
pump
rotor
stator
casing
eccentric screw
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.)
Expired - Lifetime
Application number
EP98110070A
Other languages
German (de)
English (en)
Other versions
EP0882891A1 (fr
Inventor
Niels Due Jensen
Jorgen Christensen
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.)
Grundfos AS
Original Assignee
Grundfos AS
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 Grundfos AS filed Critical Grundfos AS
Publication of EP0882891A1 publication Critical patent/EP0882891A1/fr
Application granted granted Critical
Publication of EP0882891B1 publication Critical patent/EP0882891B1/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
    • F04C5/00—Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable
    • 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

Definitions

  • the invention relates to an eccentric screw pump according to the preamble of claim 1 specified features.
  • Eccentric screw pumps are rotating positive displacement pumps and also under the Name of its inventor known as Moineau pumps.
  • An eccentric screw pump has two conveyor elements, the fixed housing insert, which is also used as Stator is called, and the rotating eccentric screw, also called a rotor referred to as.
  • the stator has a longitudinal bore, one over the length of the stator has a rotating, substantially oval cross section and arranged in this way and is designed so that their centers on a the longitudinal axis of the Stator lying helically surrounding path.
  • the rotor transfers its total length has a constant, essentially circular cross-section on, the center of which is on a helical line around the longitudinal axis of the rotor-extending path.
  • the slope of the helical Path of the rotor is half as large as that of the stator, so that the rotor path is double as many turns as the stator track.
  • Such an eccentric screw pump is known, for example, from US Pat. No. 2,695,694 known.
  • this pump there is essentially one between the rotor and the stator cylindrical jacket arranged, which is fixed at the end of the stator.
  • Such a, jacket sealing the rotor from the stator brings considerable advantages with themselves, which are also cited in the aforementioned publication.
  • the promotion of the fluid takes place between the stator and the jacket, with the jacket referring to only approaches the stator radially and removes it again, depending on the position of the Rotor and thus an abrasive rotary movement on the stator is avoided.
  • the Rotational movement is exclusively from that arranged inside the shell Rotor, which can be lubricated in a suitable manner. To this In this way, the friction within the pump and the lubrication can be reduced and possibly also cooling independently of the delivery fluid itself Dry running of the pump can be ensured.
  • the running properties can the pump and especially the wear between the rotor and stator can be reduced considerably, but the sheath itself is subject to high demands, especially in the area of the first third of its length related to the conveying direction.
  • an eccentric screw pump is known from FR 2523656, in which Form-locking elements are provided between the jacket and the stator. On the outside of the jacket are two mutually offset by 180 ° the length of the jacket provided helically extending ribs that engage in complementary grooves provided in the recess of the stator. These form-locking elements support the jacket in Longitudinal direction and in the circumferential direction.
  • the jacket Since the arrangement of the grooves in the Version in which the cross section of the recess is substantially oval is provided in the region of the short axis of the cross-sectional contour is sufficient support of the jacket in the longitudinal and circumferential directions guaranteed, however, the jacket must be in the area between the ribs be stretched considerably in sections, for example, in the area of long axis of the cross section should lie against the wall. this in turn causes wear in the area of the jacket as well as friction losses, since the jacket sections must be stretched considerably.
  • the object of the invention is based on constructive Changes to improve the life of the jacket and especially the Reduce friction losses within the pump.
  • the invention provides for the positive locking elements on the stator side To arrange the area of the long axis of the cross-sectional contour.
  • This invention The solution is based on the idea that due to this arrangement the jacket together with the rotor along the long axis of the cross-sectional contour can move, the support by the positive locking elements always only in the areas where the rotor and jacket in the cross-sectional wall area the long axis are located.
  • the engagement of the positive locking elements is So only in sections and changes depending on the rotational position of the rotor.
  • the positive locking elements are preferably by at least one on the circumference Sheath provided projection formed with play in a stator side Recess is arranged. A certain amount of play in the stator-side recesses is appropriate, even if the coat is, for what reasons whatever, the projection is not in its intended position can still reliably engage in the recess if the jacket by rotating the rotor in the vicinity.
  • the projection is in the form of a helical circumference Rib is provided on the outer circumference of the jacket, being inside the stator a corresponding groove is provided in a corresponding arrangement, in which the Rib can engage with play.
  • the outer surface should of the rotor and the inner surface of the jacket should be as smooth as possible.
  • the slope of the ribs on the outer circumference of the jacket must match that of the grooves, wherein the slope of the grooves is based on that of the stator, i. H. matches this.
  • the space formed between the jacket and the rotor is advantageous to use as part of a To use lubricant circuit.
  • the lubricant is returned thereby in a simple and at the same time expedient way along in the rotor running channel, so that no external channel guide is required. On such a channel can be easily through a central bore in the rotor be formed.
  • the jacket according to the invention preferably becomes a substantially cylindrical one Have shape and fixed on at least one of its ends on the stator side his.
  • the arrangement of the form-locking elements enables a one-sided Fixing the jacket on the rotor is sufficient, at the suction end.
  • the Sheath can be formed closed on the end face on the pressure side end.
  • the suction end is always open and preferably funnel-shaped towards the motor expanded to provide enough space for the arrangement of a Gimbal or elastic shaft to give, which with the fixed axis of rotation driving rotor of the motor with the eccentric around this axis moving rotor of the pump connects.
  • the motor-side end of the jacket can be completed by a surrounding flange with which the jacket on the stator side is set.
  • This flange advantageously extends between the motor and Pump housing so that it also performs a sealing function.
  • the flange can be designed like an O-ring on its outer circumference, so that the necessary surface pressure results within the sealing surface.
  • the jacket is open at the end on the pressure side, but designed sealed.
  • the drive motor is a liquid-filled motor or is designed as a canned motor and the rotor space of the motor is fluid-conducting connected to the inside of the jacket, especially in the lubricant circuit is involved.
  • Such training enables all rotating parts of motor and pump in the same lubricant circuit or To apply lubricant.
  • This arrangement offers moving parts regardless of the medium
  • Another special advantage is that the usual shaft seal on the motor which - as usual with seals - always represent a potential weak point, can be omitted without replacement.
  • the pump assembly shown in FIG. 1 consists of an eccentric screw pump 1 and a drive motor 2, the axially consecutive are arranged.
  • the drive motor is an electric motor with an external one Stator 3 fixed to the housing with rotor 4 arranged rotatably therein. Between rotor 3 and stator 4, a can 5 is arranged, which the stator 3 with respect to Encapsulates the rotor space.
  • the drive motor 2 is formed within a sheet metal Housing 6 arranged, the front-side bearing 7 for the rotor 4. That from The end of the housing 6 facing away from the pump 1 is sealed by a cover 8 completed while the other end near the motor shaft 9 openings 10 has, which form a fluid connection to the rotor space.
  • the eccentric screw pump 1 which is axially aligned with its housing 11 the motor housing 6 connects, is designed in one step in this embodiment. Accordingly, the stator 12 of the pump 1 has in its central recess 13 the negative form of an eccentric screw with only one turn. Accordingly, is the rotor 14 arranged inside the recess 13 as an eccentric screw formed with two turns. A jacket is between the rotor 14 and the stator 12 15 arranged, the rotor 14 hermetically against the stator and encapsulated fluid conveyed between stator 12 and jacket 15. The jacket 15 is either as in Fig. 1 and in Fig.
  • FIG. 3 show the lower middle representation, at the end closed and has a substantially cylindrical shape or is if an additional thrust bearing 16 is to be used for the casing 15, open at the end and sealed with bearing plugs 16, as shown in FIG lower representation in Fig. 3 and in Fig. 2 can be seen.
  • the jacket 15 has two helical over the length of the cylindrical Part of the outer circumference extending rib-like projections 17, the shape of which is approximately semicircular or semi-oval in cross section (see Fig. 2) and in the central recess 13 of the stator 12 correspondingly arranged grooves 18 are assigned, which the projections 17th can record with game.
  • the turns of the projections 17 and the turns of the slots 18 correspond to those of the stator 12 in pitch and number, are thus performed in one turn in the embodiment shown, so that everyone Projection 17 wraps around the jacket 15 by 360 °.
  • the cross section of the recess 13 is essentially oval, the cross sectional contour, 3 also visible, rather that of an elongated hole, d. H. with a constant radius in the curvature areas.
  • This oval The cross-sectional contour remains the same over the length of the recess 18, however their arrangement changes as a result of rotation, as is also the case with FIG. 3 is shown.
  • the long axis 27 of the cross section rotates continuously over the length of the recess 13, namely helically over 360 °.
  • the grooves 18 are arranged in the region of the long axis 27.
  • the pump housing 11 is formed from a metal tube and has in the area of the Stator 12, with which it is firmly connected, cylindrical shape, but with smaller diameter than the housing 6 of the drive motor.
  • To the drive motor 2 towards the pump housing 11 is widened conically and in the end Cross-section flanged in an L-shape.
  • the pump housing runs towards its free end tapering to a pressure port 23.
  • the axial bearing 16 shown in FIG. 3 is arranged, in which case the free end of the casing 15 relative to the thrust bearing should be fixed, at least to be sealed.
  • the rotor 14 has a central bore 24 and is otherwise either over a cardan shaft or, as shown in Fig. 1, with an elastic shaft 25 the shaft 9 rotatably connected.
  • the rotor 14 is driven by the motor shaft 9 and the elastic shaft 25 driven.
  • the located within the central recess 13 of the stator 12 rotating rotor generates one from the suction side to in a known manner Pressure side helically moving delivery chamber, the delivery fluid enters the pump housing 11 through the openings 21. It then gets between the outside of the jacket 15 and the inside of the stator recess to the pressure port 23, where it emerges.
  • This sensor is used to detect a leak between the fluid flow and the lubricant circuit, thereby at Subsequent connection of appropriate evaluation and control electronics ensured can be that when the lubricant escapes or when fluid is pumped leakage into the lubricant circuit, a corresponding one Warning signal is given or if necessary the engine stops automatically becomes.
  • the pump unit shown can, as far as the housing parts are concerned, be inexpensive are made from sheet metal parts.
  • the stator consists of one usual hard elastic material, for example hard rubber.
  • the rotor must be off a material, on the other hand, to be regarded as rigid, for example steel, be made. Because of the good lubrication conditions and practically not Given the abrasive wear, the rotor can also be made of plastic.
  • the jacket 15 is made of flexible material, such as silicone or Rubber and can be fiber-reinforced, for example by carbon fibers, or be built up in multiple layers.
  • the invention described above also applies to multi-stage Pumps and pumps with different numbers of gears.

Claims (15)

  1. Pompe à vis excentrique dite pompe Moineau, comprenant un stator (12), un rotor (14) monté en rotation dans un évidement (13) du stator (12) et se présentant sous la forme d'une vis sans fin excentrique, une enveloppe élastique (15) disposée entre le rotor (14) et le stator (12), fixée côté stator, et isolant de manière hermétique le rotor (14) par rapport à la chambre de refoulement formée entre le stator (12) et l'enveloppe (15), la pompe comprenant finalement des éléments de complémentarité de forme (17, 18) prévus entre le rotor (14) et l'enveloppe (15), l'évidement (13) du stator (12) présentant une section transversale sensiblement de forme ovale, et le contour de section transversale tournant en forme de ligne hélicoïdale dans la direction de l'axe longitudinal de l'évidement (13),
    caractérisée en ce que les éléments de complémentarité de forme (17, 18) sont agencés côté stator, dans la zone du grand axe (27) du contour de section transversale.
  2. Pompe à vis excentrique selon la revendication 1, caractérisée en ce que les éléments de complémentarité de forme (17, 18) le long de l'évidement (13) ne sont en prise réciproque que sur certains tronçons.
  3. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que l'enveloppe (15) présente une forme sensiblement cylindrique, au moins dans la zone de la chambre de refoulement.
  4. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que le diamètre extérieur de l'enveloppe (15) correspond environ au diamètre intérieur de l'évidement (13) dans la zone du petit axe transversal (28).
  5. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que sur l'enveloppe (15) est prévu en périphérie extérieure, au moins une nervure (17) en révolution hélicoïdale, qui, au moins sur certains tronçons, vient s'engager avec jeu dans une rainure (18) prévue de manière correspondante dans le stator (12).
  6. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que sont prévues sur l'enveloppe (15), deux rainures (17) disposées de manière décalée de 180°, et de façon correspondante, deux rainures (18) dans le stator (12).
  7. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que le pas des nervures (17) et des rainures (18) coïncide avec celui du stator (12).
  8. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que l'enveloppe (15) présente à son extrémité située du côté du moteur, un flasque (20) avec lequel elle est fixée de manière étanche entre le carter de moteur (6) et le carter de pompe (11).
  9. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que l'enveloppe (15) comprend une partie (19) s'évasant en forme d'entonnoir en direction du moteur (2).
  10. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que l'espace formé entre l'enveloppe (15) et le rotor (14) constitue une partie d'un circuit d'agent de lubrification, et en ce que le rotor (14) présente un canal (24) qui s'y étend longitudinalement et qui forme également une partie de ce circuit d'agent de lubrification.
  11. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que le canal (24) d'étendue longitudinale dans le rotor (14), est formé par un alésage central (24).
  12. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que le moteur d'entraínement (2) de la pompe (1) est rempli de fluide et est de préférence un moteur à gaine, et en ce que la chambre de rotor du moteur (2) est reliée sur le plan fluidique avec l'intérieur de l'enveloppe.
  13. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que les paliers (7, 16) pour le rotor (4) du moteur (2) et ceux pour le rotor (14) de la pompe (1), ainsi que d'éventuelles articulations à cardan d'un arbre (25) de liaison entre le rotor (4) du moteur (2) et le rotor (14) de la pompe (1), se situent dans une chambre remplie d'agent de lubrification, qui, côté moteur, est délimitée et fermée par une gaine (5) ainsi que par le carter de moteur (6), et côté pompe, par l'enveloppe (15).
  14. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce qu'à l'extrémité côté embout de refoulement de l'enveloppe (15) est disposé un palier axial (16) pour le rotor (14) de la pompe (1) de façon telle qu'il se produit une alimentation en agent de lubrification à partir de l'intérieur de l'enveloppe.
  15. Pompe à vis excentrique selon l'une des revendications précédentes, caractérisée en ce que l'enveloppe (15) est renforcée de fibres et/ou le rotor (14) de la pompe (1) est réalisé en matière plastique.
EP98110070A 1997-06-04 1998-06-03 Pompe Moineau Expired - Lifetime EP0882891B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19727209 1997-06-04
DE19727209A DE19727209A1 (de) 1997-06-04 1997-06-04 Exzenterschneckenpumpe

Publications (2)

Publication Number Publication Date
EP0882891A1 EP0882891A1 (fr) 1998-12-09
EP0882891B1 true EP0882891B1 (fr) 2003-03-12

Family

ID=7833753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98110070A Expired - Lifetime EP0882891B1 (fr) 1997-06-04 1998-06-03 Pompe Moineau

Country Status (2)

Country Link
EP (1) EP0882891B1 (fr)
DE (2) DE19727209A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100507274C (zh) * 2006-11-03 2009-07-01 江苏大学 电动机螺杆泵

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105443374B (zh) * 2015-12-31 2018-05-08 台州佳迪泵业有限公司 一种井用潜水螺杆电泵
DE102021111925A1 (de) 2021-05-07 2022-11-10 Seepex Gmbh Exzenterschneckenpumpe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2695694A (en) * 1951-11-03 1954-11-30 Seinfeld Emmy Margaret Diaphragm mechanism for pump clutches
FR1554319A (fr) * 1968-02-12 1969-01-17
FR2523656A1 (fr) * 1982-03-18 1983-09-23 Commissariat Energie Atomique Pompe rotative a membrane
DE3245973A1 (de) * 1982-12-11 1984-06-14 Allweiler Ag, 7760 Radolfzell Motorpumpenaggregat

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100507274C (zh) * 2006-11-03 2009-07-01 江苏大学 电动机螺杆泵

Also Published As

Publication number Publication date
EP0882891A1 (fr) 1998-12-09
DE59807432D1 (de) 2003-04-17
DE19727209A1 (de) 1998-12-10

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