EP0882891B1 - Exzenterschneckenpumpe - Google Patents
Exzenterschneckenpumpe Download PDFInfo
- 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
Links
Images
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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Description
- Fig. 1
- in stark vereinfachter Darstellung einen Längsschnitt durch ein Pumpenaggregat bestehend aus Exzenterschneckenpumpe und Motor,
- Fig. 2
- in vergrößerter perspektivischer Darstellung eine Ansicht des Mantels gemäß Fig. 1 und
- Fig. 3
- in schematischer Darstellung von oben nach unten einen Stator, einen Rotor und einen Mantel sowie die Axiallagerung des Rotors.
- 1 -
- Exzenterschneckenpumpe
- 2 -
- Antriebsmotor
- 3 -
- Stator des Motors
- 4 -
- Rotor des Motors
- 5 -
- Spaltrohr
- 6 -
- Motorgehäuse
- 7 -
- Lager des Motors
- 8 -
- Deckel des Motorgehäuses
- 9 -
- Welle des Motors
- 10 -
- Öffnungen im Motorgehäuse
- 11 -
- Pumpengehäuse
- 12 -
- Stator der Pumpe
- 13 -
- zentrale Ausnehmung im Stator
- 14 -
- Rotor der Pumpe
- 15 -
- Mantel
- 16 -
- Axiallager der Pumpe
- 17 -
- Vorsprünge am Mantel
- 18 -
- Nuten in 13
- 19 -
- trichterförmiger Teil
- 20 -
- Flansch
- 21 -
- Öffnungen
- 22 -
- Schrauben
- 23 -
- Druckstutzen
- 24 -
- zentrale Bohrung von 14
- 25 -
- elastische Welle
- 26 -
- Sensor
- 27 -
- lange Achse des ovalen Querschnitts von 13
- 28 -
- kurze Achse des ovalen Querschnitts von 13
Claims (15)
- Exzenterschneckenpumpe mit einem Stator (12), mit einem in einer Ausnehmung (13) des Stators (12) drehbar angeordneten Rotor (14) in Form einer Exzenterschnecke, mit einem zwischen Rotor (14) und Stator (12) angeordneten elastischen Mantel (15), der statorseitig festgelegt ist und den Rotor (14) gegenüber dem zwischen Stator (12) und Mantel (15) gebildeten Förderraum hermetisch abschließt, mit zwischen Rotor (14) und Mantel (15) vorgesehenen Formschlußelementen (17, 18), wobei die Ausnehmung (13) des Stators (12) einen im wesentlichen ovalen Querschnitt aufweist und die Querschnittskontur schraubenlinienförmig in Richtung der Längsachse der Ausnehmung (13) gedreht ist, dadurch gekennzeichnet, daß die Formschlußelemente (17, 18) statorseitig im Bereich der langen Achse (27) der Querschnittskontur angeordnet sind.
- Exzenterschneckenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Formschlußelemente (17, 18) längs der Ausnehmung (13) nur abschnittsweise miteinander im Eingriff sind.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Mantel (15) zumindest im Bereich des Förderraumes eine im wesentlichen zylindrische Form hat.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Außendurchmesser des Mantels (15) etwa dem Innendurchmesser der Ausnehmung (13) im Bereich der kurzen Querachse (28) entspricht.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß am Mantel (15) umfangseitig mindestens eine wendelförmig umlaufende Rippe (17) vorgesehen ist, die zumindest abschnittsweise mit Spiel in eine entsprechend im Stator (12) vorgesehene Nut (18) eingreift.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zwei um 180° versetzt angeordnete Rippen (17) am Mantel (15) und entsprechend zwei Nuten (18) im Stator (12) vorgesehen sind.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Steigung der Rippen (17) und der Nuten (18) mit der des Stators (12) übereinstimmt.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Mantel (15) an seinem motorseitigen Ende einen Flansch (20) aufweist, mit dem er dichtend zwischen Motorgehäuse (6) und Pumpengehäuse (11) festgelegt ist.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Mantel (15) einen zum Motor (2) hin trichterförmig aufgeweiteten Teil (19) aufweist.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der zwischen Mantel (15) und Rotor (14) gebildete Raum Teil eines Schmiermittelkreislaufes bildet, und daß der Rotor (14) einen darin längsverlaufenden Kanal (24) aufweist, der ebenfalls Teils dieses Schmiermittelkreislaufes bildet.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der längsverlaufende Kanal (24) im Rotor (14) durch eine zentrale Bohrung (24) gebildet ist.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Antriebsmotor (2) der Pumpe (1) flüssigkeitsgefüllt, vorzugsweise ein Spaltrohrmotor ist und daß der Rotorraum des Motors (2) fluidleitend mit dem Mantelinneren verbunden ist.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Lager (7, 16) für den Rotor (14) des Motors (2) und die für den Rotor (14) der Pumpe (1) sowie die ggf. vorhandenen Kardangelenke einer verbindenden Welle (25) zwischen dem Rotor (4) des Motors (2) und dem Rotor (14) der Pumpe (1) in einem schmiermittelgefüllten Raum liegen, der motorseitig durch ein Spaltrohr (5) sowie das Motorgehäuse (6) und pumpenseitig durch den Mantel (15) begrenzt und abgeschlossen ist.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß am druckstutzenseitigen Ende des Mantels (15) ein Axiallager (16) für den Rotor (14) der Pumpe (1) derart angeordnet ist, daß eine Schmiermittelbeaufschlagung vom Mantelinneren her erfolgt.
- Exzenterschneckenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Mantel (15) faserverstärkt und/oder der Rotor (14) der Pumpe (1) aus Kunststoff bestehend ausgebildet ist.
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 (de) | 1998-12-09 |
EP0882891B1 true EP0882891B1 (de) | 2003-03-12 |
Family
ID=7833753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98110070A Expired - Lifetime EP0882891B1 (de) | 1997-06-04 | 1998-06-03 | Exzenterschneckenpumpe |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0882891B1 (de) |
DE (2) | DE19727209A1 (de) |
Cited By (1)
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)
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)
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 (de) * | 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 |
-
1997
- 1997-06-04 DE DE19727209A patent/DE19727209A1/de not_active Ceased
-
1998
- 1998-06-03 DE DE59807432T patent/DE59807432D1/de not_active Expired - Lifetime
- 1998-06-03 EP EP98110070A patent/EP0882891B1/de not_active Expired - Lifetime
Cited By (1)
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 (de) | 1998-12-09 |
DE59807432D1 (de) | 2003-04-17 |
DE19727209A1 (de) | 1998-12-10 |
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