EP0994256A1 - Stator für Exzenterschneckenpumpen - Google Patents
Stator für Exzenterschneckenpumpen Download PDFInfo
- Publication number
- EP0994256A1 EP0994256A1 EP99115974A EP99115974A EP0994256A1 EP 0994256 A1 EP0994256 A1 EP 0994256A1 EP 99115974 A EP99115974 A EP 99115974A EP 99115974 A EP99115974 A EP 99115974A EP 0994256 A1 EP0994256 A1 EP 0994256A1
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- EP
- European Patent Office
- Prior art keywords
- outer part
- stator
- elastomer body
- stator according
- pressure
- 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.)
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Classifications
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- 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 present invention relates to a stator for eccentric screw pumps and in particular a stator with a easily replaceable elastomeric inner part.
- stators are usually referred to as slide-in stators.
- Stators generally consist of an elastomeric, essentially cylindrical molded part with an inner pump cavity, which is shaped in accordance with a single or multiple-flight worm and accommodates the rotor.
- the pump cavity is usually dimensioned such that the elastomer bears against the outside of the rotor with a prestress.
- the elastomeric inner part is usually enclosed in a stabilizing jacket.
- the elastomer part wears out during conveyor operation. The wear can first be compensated for by re-tensioning the stator. After a certain period of operation, however, it is necessary to remove the stator and to replace the elastomer part or the entire stator. For cost reasons and from an ecological point of view, it is advantageous to replace only the elastomeric inner part and not the stator as a whole.
- Stators keep leaking.
- the stators can therefore only in general at low delivery pressures are used while they are not at high delivery pressures or are difficult to use.
- stator is only or predominantly only on the suction side excited, the inflow of material is obstructed and the required Pressure cannot build up. Desirable is therefore a stator that is uniform over its entire length can be excited.
- a stator which largely has the disadvantages described above avoids, is in German utility model No. 295 16,885.
- the stator has an elastomeric Inner body with elevations arranged on the outer surface on. These surveys are in recesses from stabilizing outer parts, which from the outside to the Elastomer body can be created.
- the stabilizing External parts are covered by a tubular jacket with a cylindrical Outside contour held together, which over the Outer parts is pushed.
- To re-tension the stator the cylindrical jacket used initially by another cylindrical mantle replaced by a lesser Has inner diameter than the first jacket.
- a good Tightness on the suction and pressure side is ensured by the special Design of the end faces of the elastomer body achieved. To increase the tightness are on both ends of the stator specially designed O-ring Flanges provided.
- stator described in utility model 295 16 885 is Starting point for the present invention.
- This stator has become difficult even as often found on construction sites, proven.
- a disadvantage consists, however, in that the winding of the cylindrical A considerable amount of force is required for the jacket. The same applies when removing the jacket from the worn one To be able to replace the inner elastomer body or to tighten the stator by putting on a narrower jacket.
- suitable tools such as combination wrenches or ring spanners considerable difficulties.
- the invention is therefore based on the object of providing a stator which has a removable elastomeric inner part which can be removed from the stator at the place of use of the stator as far as possible without the aid of tools.
- the stator should also be easy to re-tension and have a good seal even under difficult operating conditions.
- the invention thus relates to a slide-in stator for eccentric screw pumps, which comprises a removable elastomer body with an essentially cylindrical basic structure, as well as at least one outer part which bears against the outer surface of the elastomer body and a support jacket which surrounds the at least one outer part.
- a pump cavity for receiving a rotor runs in the interior of the elastomer body in the axial direction.
- This pump cavity can be shaped in the usual way in the manner of a single or multiple-flight screw. Elevations and / or depressions are present on the outer periphery of the elastomer body, which engage in a form-fitting manner in corresponding depressions and / or elevations of the at least one outer part.
- the at least one outer part is in turn surrounded by the support jacket, which holds the insertion stator together.
- the at least one outer part is conical and in such a way that its outer diameter increases from the suction side of the stator to its pressure side.
- the inner diameter of the support jacket changes, so that the inner surface of the support jacket rests essentially on the at least one outer part over its entire surface.
- the invention has at least one outer part, which rests on the elastomer body, on the suction side of the stator has a smaller outer diameter than on the Pressure side of the stator.
- the outside diameter preferably increases of the at least one outer part from the suction side - that is the side on which the medium to be pumped enters the stator enters - towards the print side continuously. Same thing applies accordingly to the inner diameter of the support jacket, which surrounds the at least one outer part.
- the taper is expediently chosen so that the Support sheath in the usual conditions of use in the desired Position remains and does not shift.
- the taper can therefore vary depending on the pressure conditions inside of the stator during operation so that it self-locking of the support jacket on the outer part is coming.
- stator is very stable during operation and the support jacket sits firmly on the at least one outer part during operation, the stator can be disassembled into its individual components with little effort in order to replace the elastomer body.
- the support jacket has to be pushed or knocked away in the direction of the suction side of the stator. Because of the decreasing outer diameter of the at least one outer part towards the suction side, this is very easily possible. It is usually sufficient to open the pressure-side edge of the support jacket on a projection in order to detach the support jacket from the at least one outer part. No special tool is required to disassemble the stator according to the invention into its individual components and to replace a worn elastomer part. Assembling the stator and fitting the support jacket from the suction side is also easy and requires little effort.
- the conical design of the outer parts and support jacket also makes it easier to re-tension the stator.
- the stator will be used tubular support jackets retightened in that a first support jacket with another support jacket a smaller inner diameter is replaced. To do this so the first support jacket completely from the outer parts removed and replaced by the second support jacket.
- Replacement of the support jacket is not necessary.
- the inside diameter increases from the suction side to the pressure side of the stator, the support jacket only has to continue towards the Printing side advanced on the at least one outer part become.
- the outer diameter of the at least an outer part according to the invention from the suction side towards the pressure side also increases by moving of the support jacket, the outer parts continue to stack moves and thus the pump cavity is reduced.
- a continuous increase in the outside diameter of the at least an outer part or the inner diameter of the support jacket is a continuous narrowing of the pump cavity and thus a stepless and even one Retensioning of the stator possible. Neither can be missed, both pressure and suction side of the stator to tighten, still it can because of the tapered formation confuse the stator sides.
- the support jacket expediently in its pressure side area on the inside edge a curve or chamfer.
- the support jacket of the stator according to the invention is tubular.
- the support jacket In the case of an essentially uniform wall thickness of the jacket and with continuous the support jacket therefore has an increasing inside diameter essentially the shape of a truncated cone.
- the support jacket with variable Form wall thickness, so that for example the outer shape is essentially similar to a cylinder.
- the outer contour of the support jacket also in the form of a polygon be designed so that the stator against rotation during operation can be clamped.
- one or. on the outer surface of the support jacket attach multiple protrusions or brackets that the serve the same purpose. These anti-rotation locks can for example by contacting the tie rods of a construction machine be attached.
- a jacket can also be used in the form of a clamp.
- the clamp can, for example, like a hose clamp be constructed and a truncated cone slit in the longitudinal direction include. Such is used for retensioning Sheath not axially on the least moved an outer part, but it remains in the predetermined position and is by tightening the jig tightened.
- the support jacket of the stator according to the invention is made Appropriately made of a dimensionally stable, unbreakable material.
- This can be a suitable plastic, for example Be hard rubber.
- the support jacket preferably exists of metal and in particular of steel.
- Suitable as material for the at least one outer part also a dimensionally stable material such as metal, hardwood or a suitable plastic.
- a dimensionally stable material such as metal, hardwood or a suitable plastic.
- a suitable plastic for example, in particular Polypropylene and phenolic resin-soaked hardwood such as OBO solid wood can be called.
- the elastomer body can be made from those previously suitable for this Materials are made. These are elastomeric plastics such as rubber, natural or synthetic rubber. For example, Polyurethane.
- the elastomer body can essentially resemble that of utility model 295 16 885 is described.
- the surveys and / or Wells of the elastomer body described there are at least the wells and / or elevations formed an outer part, which on the elastomer body lies on.
- the surveys in Elastomer body and / or outer part as elongated webs or Knobs of any shape should be formed.
- you can the elevations are formed in the manner of a thread that engages positively in a corresponding counter thread.
- the height of the elevations on the elastomer body to adapt to the taper of the outer parts of the stator Appropriately therefore takes the height of the surveys towards the pressure side end of the stator in such a way that the surveys are essentially in one plane with the Complete the adjacent outer surface of the outer part. The surfaces of the are therefore in the assembled state Elevations also on the support jacket. This ensures that the stator according to the invention even at very high pressures from e.g. 50 bar or more can be used.
- the elastomer body at least has a feather key-like elevation, which in runs essentially in the axial direction and in a groove-like Slit in at least one outer part in a form-fitting manner intervenes.
- a feather key-like elevation which in runs essentially in the axial direction and in a groove-like Slit in at least one outer part in a form-fitting manner intervenes.
- Such a configuration particularly prevents effective twisting or axial slipping of the elastomer body.
- To ensure good tightness at the front To achieve the stator according to the invention extends the groove-like slot preferably not over the entire Length of the at least one outer part, and has accordingly the feather key-like elevation is less than that of the elastomer body.
- the stator can be tightly sealed at the end when the elastomer body is at its top and / or its lower end face a flange-like Has a head start.
- the at least one outer part is then Conveniently designed so that it is attached to the front flange-like projections of the elastomer body are adjacent.
- the at least one outer part expediently has one correspondingly lower height than the elastomer body.
- the flange-like projection is preferably serrated or O-ring shaped.
- Flange-like projection and that are particularly preferred at least one outer part designed so that the outer part engages in an undercut of the flange-like projection.
- the flange-like protrusion takes in its Thickness in the radial direction from the inside to the outside.
- at least one outer part on one or bevelled on both ends so that the inner edge in protrudes axially beyond the outer edge. To this Way is prevented that the flange-like projection when the stator is operated by the one on the stator Pressure is pulled radially inwards and so to the Leakage occurs at the end faces.
- the undercut also fixes the outer part to the elastomer body and prevents both parts from falling apart before the Support jacket is put on.
- At least two To use external parts that are essentially in the form of a have a truncated cone shell divided in the longitudinal direction.
- Two longitudinal truncated cone segments are preferred used.
- Exceptional projection for example a stop flange, be present, which prevents the Support jacket pushed too far towards the pressure side can be.
- the outer parts can be made of plastic such as polypropylene. Appropriately it is manufactured using an injection molding process. In this case, however, it is very difficult to get the right one to manufacture thick-walled parts accurately.
- the at least one outer part evenly rests on the elastomer body and good surface contact can be obtained in the pressure-side area of the outer part at least one extending in the axial direction Slot. This slot increases the adaptability between the elastomer body and the outer part.
- the slot can, for example, from the pressure side edge of the at least one outer part up to about two thirds of the Length of the outer part run.
- Shorter slots are present from the print edge to a depression, which is used to hold a Elevation of the elastomer body is determined.
- the insertion stator 1 shows an example of a device according to the invention Stator in longitudinal section in the area of the central axis of the stator.
- the insertion stator 1 comprises an elastomer body 2 and two outer parts 3. Each of the two outer parts 3 surrounds the elastomer body 2 essentially semicircular
- the sectional view shows an area in which is groove-like on both sides in one of the outer parts 3 Longitudinal slots are present, so that from the outer part only the front areas are visible.
- the Outer diameter of the outer part 3 increases from the suction side of the stator in the direction of the pressure side continuously to.
- the suction side of the stator is the side at which the medium to be conveyed enters the stator, is in the illustration above, the printed page in lower part of the figure.
- the outside diameter is corresponding d1 smaller on the upper face of the outer part than the diameter d2 in the pressure side edge area of the Outer part.
- the outer part 3 lies with its entire inner surface the outer surface of the elastomer body 1.
- the elastomer body 2 is essentially cylindrical. In his Interior extends in the axial direction of the pump cavity 5, here like a catchy snail is trained.
- On the cylindrical outer surface of the Elastomer body 2 are a total of four feather keys Elevations 6 evenly over the outer circumference of the Distributed elastomer body.
- the parallel keys 6 engage positively in the groove-like recesses 7 of the two External parts 3 a.
- the height of the parallel keys decreases from the Suction side towards the pressure side. The height changes in such a way that the surface of the feather keys 6 ends with the outer surface of the outer parts 3.
- flange-like Projections 8 available on both ends of the elastomer body 2 . These projections worry for a good seal on the front of the stator.
- the essentially O-ring-shaped flanges 8 are designed that their thickness is radial from the inside out to change. As can be seen in Fig. 1, the thickness of the Flanges 8 radially outwards. According to the increase in thickness the flanges are the front edge areas the outer parts 3 beveled. The slope 9 runs so that the radially inner edge of the outer part 3 over protrudes the radially outer edge.
- the support jacket 4 is pushed on. This is through the bracket 13, which on both sides of the support jacket protrudes, relieved.
- the bracket can also on the tie rod be attached to a construction machine, in order to secure the stator secure against twisting.
- Fig. 2 shows the elastomer body 2, which in the in Fig. 1 stator shown was used, in side view.
- the course of the pump cavity 5 and the undercut in the flange-like projections 8 on both ends is indicated by dashed lines.
- To the one on the right and two of the four on the left Feather keys 6 can be seen that the height of the The suction side changes continuously towards the pressure side, namely enlarged. This ensures that the Surface of the parallel keys 6 on the inside of the support jacket 4 is present. This ensures high pressure resistance of the stator according to the invention.
- FIG. 3 shows one of the two outer parts 3 of the one in FIG. 1 shown stator.
- the outer part essentially has the shape of a truncated cone shell halved in the longitudinal direction.
- the outer diameter of the outer part is reduced from the pressure side towards the suction side of the stator (d2> d1). This is due to an increase in wall thickness reached towards the pressure side.
- the inner surface the outer part 3 corresponds essentially to a halved Cylinder.
- the recesses 7 in the outer part correspond in position and shape the corresponding key-like Elevations 6 in the elastomer body 2.
- 4 and 5 each show elastomer bodies with attached Exterior parts in side view.
- the elastomer body is as far as it is covered by the outer parts, with dashed lines Lines indicated.
- 4 and 5 is the View of one of the two outer parts 3 to see which one surrounds the elastomer body essentially semicircular, while the second outer part is on the rear Side of the elastomer body is placed in mirror image and is covered by the first outer part.
- the slots 10 and 11 each serve to ensure a form-fitting contact between the elastomer body 2 and the outer part 3 during operation of the stator. If a plastic such as polypropylene is used in the manufacture of the outer parts and the outer parts are produced, for example, in an injection molding process, it is difficult to manufacture the outer parts so accurately that a positive engagement of the elastomer body with the outer parts is ensured.
- the additional slots 10 and 11 act as expansion joints, which allow the outer parts in the pressure side area increased flexibility and adaptability to the elastomer body. It is particularly in this area on the pressure side that the accuracy of fit is of particular importance, since this is where the pressure of the stator is greatest.
- Fig. 6 shows a sectional view taken along the line A-A of the 5 arrangement of the elastomer body and Outside parts. With the circle and oval in the center of the figure the eccentricity of the pump cavity is to be indicated. The arrows labeled 11 illustrate the position the longitudinal slots 11.
- Fig. 6 it can be seen that the two outer parts 3 with their longitudinal edges do not directly abut each other, but are separated from each other by a gap 12.
- This Gap 12 enables the stator to be re-tensioned. Emotional if you close the two outer parts towards each other, it narrows the interior between the two parts and thus that of Elastomer body enclosed pump cavity 5. On this The elastomer body can again be attached to the (not shown) Rotor are pressed. Retensioning can as described, either by advancing one tubular support jacket towards the pressure side there or by tightening a clamp.
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- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Im Förderbetrieb verschleißt sich das Elastomerteil. Der Verschleiß kann zunächst durch Nachspannen des Stators ausgeglichen werden. Nach einer gewissen Betriebszeit ist es jedoch erforderlich, den Stator auszubauen und den Elastomerteil oder den ganzen Stator zu ersetzen.
Aus Kostengründen und unter Ökologischen Gesichtspunkten ist es vorteilhaft, lediglich das elastomere Innenteil zu ersetzen und nicht den Stator insgesamt.
Erfindungsgemäß ist das wenigstens eine Außenteil konisch ausgebildet und zwar derart, daß sein Außendurchmesser von der Saugseite des Stators zu dessen Druckseite hin zunimmt. Entsprechend der Konizität des Außenteils oder der Außenteile ändert sich der Innendurchmesser des Stützmantels, so daß dieser im wesentlichen ganzflächig mit seiner Innenfläche auf dem wenigstens einen Außenteil aufliegt.
Auch das Zusammensetzen des Stators und das Aufsetzen des Stützmantels von der Saugseite her ist einfach und ohne großen Kraftaufwand möglich.
- Fig. 1
- einen Längsschnitt durch einen erfindungsgemäßen Einschubstator;
- Fig. 2
- einen Elastomerkörper eines erfindungsgemäßen Stators in Seitenansicht;
- Fig. 3
- ein Außenteil eines erfindungsgemäßen Stators;
- Fig. 4
- einen Elastomerkörper eines erfindungsgemäßen Stators mit aufgesetztem Außenteil;
- Fig. 5
- einen Elastomerkörper mit einem anderen Beispiel eines aufgesetzten Außenteils; und
- Fig. 6
- eine Schnittansicht eines Elastomerkörpers mit zwei aufgesetzten Außenteilen entlang der Linie A-A in Fig. 5.
In Fig. 4 weist das Außenteil 3 einen Schlitz 10 auf, der sich vom druckseitigen Randbereich des Außenteils bis zu der mittleren nutähnlichen Öffnung 7 erstreckt. Im Außenteil 3 gemäß Fig. 5 sind zwei zusätzliche, längere Schlitze 11 vorhanden, die zu beiden Seiten des mittleren nutähnlichen Schlitzes 7 und etwa in der Mitte zwischen diesem mittleren nutähnlichen Schlitz und den beiden seitlichen Schlitzen 7 des Außenteils angeordnet sind. Die Schlitze 11 erstrecken sich jeweils vom druckseitigen Randbereich bis etwa zum oberen Drittel des Außenteils 3.
Verwendet man bei der Herstellung der Außenteile einen Kunststoff wie Polypropylen und werden die Außenteile beispielsweise in einem Spritzgußverfahren hergestellt, ist es nur schwer möglich, die Außenteile so maßgenau zu ferigen, daß eine formschlüssige Anlage des Elastomerkörpers an den Außenteilen gewährleistet ist. Die zusätzlichen Schlitze 10 und 11 wirken quasi als Dehnfugen, welche den Außenteilen im druckseitigen Bereich eine erhöhte Flexibilität und Anpassungsfähigkeit an den Elastomerkörper ermöglichen. Gerade in diesem druckseitigen Bereich ist die Paßgenauigkeit von besonderer Wichtigkeit, da hier der Druck des Stators am größten ist. Während an der Saugseite ein Druck von 0 bar anliegt, kann der Druck zur Druckseite hin linear bis auf etwa 60 bar ansteigen. Im saugseitigen Bereich sind die Anforderungen an die Paßgenauigkeit des Stators deshalb geringer. Durch das Anbringen der Schlitze 10 und 11 im druckseitigen Bereich der Außenteile über etwa zwei Drittel von deren Gesamtlänge kann eine hervorragende Paßgenauigkeit erreicht werden, ohne den Außenteilen ihre Eigenstabilität zu nehmen, da im oberen Drittel keine Schlitze vorhanden sind.
Die Anzahl und Länge der Schlitze, die auch kürzer als zwei Drittel der Gesamtlänge sein können, kann nach Belieben und entsprechend den jeweiligen Anforderungen variiert werden. Es sollte jedoch darauf geachtet werden, daß die Eigenstabilität der Außenteile nicht zu weit herabgesetzt wird.
Claims (25)
- Einschubstator (1) für Exzenterschneckenpumpen, welcher einen herausnehmbaren Elastomerkörper (2) mit im wesentlichen zylindrischem Grundaufbau, wenigstens ein an der Außenoberfläche des Elastomerkörpers anliegendes Außenteil (3) und einen das wenigstens eine Außenteil umgebenden Stützmantel (4) umfaßt, in welchem der Elastomerkörper in seinem Inneren einen in axialer Richtung verlaufenden Pumpenhohlraum (5) zur Aufnahme eines Rotors und auf seinem äußeren Umfang Erhebungen (6) und/oder Vertiefungen aufweist, welche in entsprechende Vertiefungen (7) und/oder Erhebungen des wenigstens einen Außenteils (3) formschlüssig eingreifen,
dadurch gekennzeichnet,daß das wenigstens eine Außenteil (3) konisch ausgebildet ist, derart daß sein Außendurchmesser von der Saugseite des Stators zu dessen Druckseite hin zunimmt (d1<d2),und daß sich der Innendurchmesser des Stützmantels (4) im wesentlichen entsprechend der Konizität des wenigstens einen Außenteils ändert. - Stator gemäß Anspruch 1,
dadurch gekennzeichnet,daß die Erhebungen in Elastomerkörper (2) und/oder Außenteil (3) als längliche Stege oder Noppen ausgebildet sind. - Stator gemäß Anspruch 1,
dadurch gekennzeichnet,daß die Erhebungen in Elastomerkörper (2) oder Aussenteil (3) in der Art eines Gewindes ausgebildet sind, das in ein entsprechendes Gegengewinde in dem wenigstens einen Außenteil (3) oder dem Elastomerkörper (2) formschlüssig eingreift. - Stator gemäß Anspruch 1,
dadurch gekennzeichnet,daß das wenigstens eine Außenteil (3) wenigstens einen im wesentlichen in axialer Richtung verlaufenden nutähnlichen Schlitz (7) aufweist und der Elastomerkörper wenigstens eine in dem Schlitz aufnehmbare paßfederartige Erhebung (6) besitzt. - Stator gemäß Anspruch 4,
dadurch gekennzeichnet,daß der wenigstens eine nutähnliche Schlitz (7) nicht über die gesamte Länge des wenigstens einen Außenteils verläuft und die wenigstens eine paßfederartige Erhebung (6) nicht über die gesamte Länge des Elastomerkörpers (2). - Stator gemäß einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,daß wenigstens zwei Außenteile (3) vorhanden sind, die im wesentlichen die Form eines in Längsrichtung geteilten, beispielsweise halbierten, Kegelstumpfmantels besitzen, und welche den Elastomerkörper im wesentlichen umschließen. - Stator gemäß einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,daß der Elastomerkörper (2) an seiner oberen und/oder seiner unteren Stirnseite einen flanschähnlichen Vorsprung (8) aufweist und daß das wenigstens eine Außenteil (3) eine geringere Höhe besitzt als der Elastomerkörper und so lang ist, daß es stirnseitig an den oder die flanschähnlichen Vorsprünge des Elastomerkörpers angrenzt. - Elastomerkörper gemäß Anspruch 7,
dadurch gekennzeichnet,daß der flanschähnliche Vorsprung (8) gerieft oder O-ringförmig ist. - Stator gemäß Anspruch 7 oder 8,
dadurch gekennzeichnet,daß der wenigstens eine flanschähnliche Vorsprung (8) so ausgebildet ist, daß seine Dicke in radialer Richtung von innen nach außen zunimmt. - Stator gemäß Anspruch 9,
dadurch gekennzeichnet,daß das wenigstens eine Außenteil (3) an einer oder beiden Stirnseiten so angeschrägt (9) ist, daß der Innenrand in axialer Richtung über den Außenrand vorsteht. - Stator gemäß einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet,daß der Innendurchmesser des wenigstens einen Aussenteils (3) von der Saugseite des Stators zu dessen Druckseite hin abnimmt. - Stator gemäß einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet,daß das wenigstens eine Außenteil (3) im druckseitigen Bereich wenigstens einen über den äußeren Umfang herausragenden Vorsprung, beispielsweise einen Anschlagflansch, aufweist. - Stator gemäß einem der Ansprüche 6 bis 12,
dadurch gekennzeichnet,daß die Außenteile (3) schwenkbar, beispielsweise durch Scharniere, miteinander verbunden sind. - Stator gemäß einem der Ansprüche 1 bis 13,
dadurch gekennzeichnet,daß das wenigstens eine Außenteil (3) in seinem druckseitigen Bereich einen oder mehrere in axialer Richtung verlaufende Schlitze (10, 11) aufweist. - Stator gemäß Anspruch 14,
dadurch gekennzeichnet,daß der wenigstens eine Schlitz (11) sich vom druckseitigen Rand bis etwa über zwei Drittel der Länge des Außenteils erstreckt. - Stator gemäß Anspruch 14,
dadurch gekennzeichnet,daß der wenigstens eine Schlitz (10) vom druckseitigen Rand bis zu einer Vertiefung (7) verläuft, die zur Aufnahme einer Erhebung (6) des Elastomerkörper (2) bestimmt ist. - Stator gemäß einem der Ansprüche 1 bis 16,
dadurch gekennzeichnet,daß die Erhebungen (6) des Elastomerkörpers (2) in ihrer Höhe in Richtung auf das druckseitige Ende des Stators hin zunehmen und im wesentlichen in einer Ebene mit der benachbarten Außenoberfläche des wenigstens einen Außenteils (3) abschließen. - Stator gemäß einem der Ansprüche 6 bis 17,
dadurch gekennzeichnet,daß die um den Elastomerkörper (2) angeordneten Aussenteile (3) mit ihren Längskanten nicht unmittelbar aneinanderstoßen, sondern wenigstens einen Spalt (12) freilassen und den Elastomerkörper nicht vollständig abdecken. - Stator gemäß einem der Ansprüche 1 bis 18,
dadurch gekennzeichnet,daß der Stützmantel (4) röhrenförmig ausgebildet ist. - Stator gemäß einem der Ansprüche 1 bis 19,
dadurch gekennzeichnet,daß der Stützmantel (4) an seiner Außenseite einen oder mehrere Vorsprünge oder Halterungen (13) aufweist. - Stator gemäß einem der Ansprüche 1 bis 20,
dadurch gekennzeichnet,daß der Stützmantel (4) an seinem druckseitigen Ende am inneren Durchmesser mit einer umlaufenden Fase oder Rundung (14) versehen ist. - Stator gemäß einem der Ansprüche 1 bis 21,
dadurch gekennzeichnet,daß der Stützmantel (4) eine Spannschelle ist. - Stator gemäß einem der Ansprüche 1 bis 22,
dadurch gekennzeichnet,daß der Stützmantel (4) aus einem formstabilen, bruchsicheren Material, vorzugsweise aus Metall und insbesondere aus Stahl, besteht. - Stator gemäß einem der Ansprüche 1 bis 23,
dadurch gekennzeichnet,daß das wenigstens eine Außenteil (3) aus einem formstabilen Material wie Metall, Festholz oder Kunststoff und insbesondere aus Polypropylen oder OBO-Festholz besteht. - Stator gemäß einem der Ansprüche 1 bis 24,
dadurch gekennzeichnet,daß der Elastomerkörper (2) aus Gummi, natürlichem oder synthetischem Kautschuk besteht.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19847406 | 1998-10-14 | ||
DE1998147406 DE19847406C2 (de) | 1998-10-14 | 1998-10-14 | Stator für Exzenterschneckenpumpen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0994256A1 true EP0994256A1 (de) | 2000-04-19 |
Family
ID=7884476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99115974A Withdrawn EP0994256A1 (de) | 1998-10-14 | 1999-08-13 | Stator für Exzenterschneckenpumpen |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0994256A1 (de) |
DE (1) | DE19847406C2 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009024279A1 (de) * | 2007-08-17 | 2009-02-26 | Seepex Gmbh | Exzenterschneckenpumpe mit geteiltem stator |
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 |
USRE44403E1 (en) | 2002-02-08 | 2013-08-06 | Millennium Cryogenic Technologies Ltd. | Method of removing stators from tubular stator housings |
DE102017126002B3 (de) | 2017-11-07 | 2019-02-14 | Seepex Gmbh | Exzenterschneckenpumpe |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10103476C1 (de) | 2001-01-26 | 2002-11-14 | Usd Formteiltechnik Gmbh | Einschubstator für Exzenterschneckenpumpen |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29516885U1 (de) * | 1995-10-25 | 1996-02-01 | Gumasol Werke Dr Mayer Stiftun | Stator für Exzenterschneckenpumpen |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1553197A1 (de) * | 1965-09-08 | 1970-08-06 | Schlecht Dipl Ing Karl | Exzenterschneckenpumpe mit verschiebbarem Stator |
-
1998
- 1998-10-14 DE DE1998147406 patent/DE19847406C2/de not_active Expired - Fee Related
-
1999
- 1999-08-13 EP EP99115974A patent/EP0994256A1/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29516885U1 (de) * | 1995-10-25 | 1996-02-01 | Gumasol Werke Dr Mayer Stiftun | Stator für Exzenterschneckenpumpen |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE44403E1 (en) | 2002-02-08 | 2013-08-06 | Millennium Cryogenic Technologies Ltd. | Method of removing stators from tubular stator housings |
WO2009024279A1 (de) * | 2007-08-17 | 2009-02-26 | Seepex Gmbh | Exzenterschneckenpumpe mit geteiltem stator |
US8439659B2 (en) | 2007-08-17 | 2013-05-14 | Seepex Gmbh | Eccentric screw pump with split stator |
CN101796301B (zh) * | 2007-08-17 | 2013-05-15 | 西派克有限公司 | 设有分体型定子的偏心螺杆泵 |
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 |
DE102017126002B3 (de) | 2017-11-07 | 2019-02-14 | Seepex Gmbh | Exzenterschneckenpumpe |
Also Published As
Publication number | Publication date |
---|---|
DE19847406C2 (de) | 2001-02-08 |
DE19847406A1 (de) | 2000-04-27 |
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