EP1282777B1 - Rotating piston pump - Google Patents

Rotating piston pump Download PDF

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Publication number
EP1282777B1
EP1282777B1 EP00941960A EP00941960A EP1282777B1 EP 1282777 B1 EP1282777 B1 EP 1282777B1 EP 00941960 A EP00941960 A EP 00941960A EP 00941960 A EP00941960 A EP 00941960A EP 1282777 B1 EP1282777 B1 EP 1282777B1
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EP
European Patent Office
Prior art keywords
piston
pump
pump according
polymer
recess
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
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EP00941960A
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German (de)
French (fr)
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EP1282777A1 (en
Inventor
Harald Vogelsang
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Hugo Vogelsang Maschinenbau GmbH
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Hugo Vogelsang Maschinenbau GmbH
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Publication of EP1282777A1 publication Critical patent/EP1282777A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/102—Adjustment of the interstices between moving and fixed parts of the machine by means other than fluid pressure
    • 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
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F04C2230/602—Gap; Clearance
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/80—Repairing methods

Definitions

  • the invention relates to a pump having one or more rotatable pistons according to the preamble of claim 1 and to a method for compensating for wear-related wear of an outer polymer layer of a pump piston according to the preamble of claim 11.
  • Such a pump is known from the GB-A-1302087 (equals to DE-A-2002518 same applicant).
  • the DE-A-20 02 518 shows an elastomer coating for rotary lobes of pumps, which are used for the promotion of solids loaded suspensions.
  • a coating can yield elastically, provided that solid particles penetrate into the gap between the piston and the wall or into the gap between the rotational pistons spaced as closely as possible from each other. This prevents blocking of the rotational movement by solids.
  • the EP 0 599 333 B1 shows therefore piston parts, which are individually interchangeable, without having to replace the entire piston.
  • the wing tips are designed as push-on sealing strips, which are fastened in a dovetail-shaped guide and can be replaced if necessary.
  • the production cost of such a design is very high.
  • In In
  • In also usually all the piston tips must be replaced at the same time, so that overall the maintenance costs for such replacement is increased, since the number of parts to be replaced compared to a replacement of a piston has grown significantly.
  • the formation of such a dovetail guide manufacturing technology is very expensive.
  • the invention is based on the problem to counteract the wear-related wear of an outer polymer layer of a pump piston with the least possible effort.
  • Such a recess may extend substantially along a contact line of the piston to a wall of the pump chamber, so counteract a radial dilution of the outer polymer layer by introducing a support body, as well as be arranged substantially perpendicular to the axis of rotation, so that the introduction of the support body transverse to the axial course against the wall of the pump chamber sealing piston areas, which are also exposed to wear, expands.
  • the pump 1 according to the embodiment shown in Fig. 1 has a pump chamber 2, in which two identically designed piston 3,4 roll on each other and convey a liquid from an entrance slit 5 to an outlet opening 6.
  • the pistons 3 and 4 are each formed with two lobes, which is not mandatory.
  • the pistons run in the direction of the arrows 7, 8 about the axes of rotation 9, 10 and are held detachably by means of paralleling springs 11, 12 on the shafts 13, 14.
  • the wing tips 3a, 3b and 4a, 4b are guided during the rotation at a close distance to the walls 15,16 of the pump chamber 2 and the respective other piston 3 and 4 respectively.
  • the pistons 3, 4 are encircled by an elastic polymer layer, in particular an elastomer layer, at least around the highly loaded wing tips 3a, 3b or 4a, 4b. This seals the piston 3,4 against each other and against the walls 15,16 of the pump chamber 2 from.
  • Fig. 1 see also Fig.
  • wing tips 3a, 3b, 4a, 4b each have a recess disposed within the elastomer layer 17,18, which extends parallel to the axis of rotation 9 and 10 and for receiving a support body 20 is provided.
  • the recess 19 is complete according to the embodiment disposed within the elastomer layer 17 and 18, respectively.
  • a twisted piston 103 is shown, which is also fixed by means of a feather key 111 on a shaft 113 and about a rotation axis 109 is rotatable.
  • the recesses 119 are thereby spirally introduced into the wing tips 103a, 103b, 103c, which also extend helically with respect to the shaft 113.
  • the introduced support bodies 120 shown here may be bendable or be made with a corresponding curvature.
  • the piston 103 is dreiflüglig. This is again not mandatory.
  • a plurality of pistons 103 can slide on each other.
  • a multi-winged piston (eight-winged) 203 of a cell pump is shown, which is held on a shaft 213 and rotates in the direction 207 about an axis of rotation 209.
  • the piston 203 shows a surface layer which consists entirely of a polymer and the piston 203 substantially completely.
  • recesses 219 are each formed axially parallel, which can serve to receive support bodies 220.
  • Fig. 6. another piston 303 is shown, which generally corresponds to the piston 3 in Fig. 1 substantially, however, has indentations 321 and 322 at the wing tips 303 a and 303 b, thereby a secure hold against lifting of the polymer layer 317 and To ensure an anti-rotation of the polymer layer 317.
  • wing tip 303a At the lower end in Fig. 6 (wing tip 303a) is a recess 319, which is designed as an axially parallel channel, shown before introducing a support body. A flattening of the outer polymer layer 317, due to wear, is visible here.
  • a piston 403 is shown, the recesses 419 are perpendicular to the axis of rotation 409, so that by introducing support members 420, a widening of the upper and lower boundary plane, which is perpendicular to the axis of rotation 409 is effected, which then in place or in Addition to the widening of the wing tips and a widening of the transverse surfaces is possible.
  • FIG. 4 shows the sequence of the method according to the invention for compensating for wear of the outer polymer layer.
  • the polymer layer 17 is also intact in the region of the wing tip 3a and has its full original width.
  • the recess 19 is a the diameter of the channel formed by the recess 19 corresponding support body, for example, a steel pin or a pin made of plastic, introduced.
  • the polymer layer 17 is thinned, a gap is formed between the wall 15 and the outer boundary of the piston 3.
  • the support body 20 is removed and a circumferentially expanded support body 20a is used, which by its larger diameter an expansion the recess 19 and thus also the surrounding polymer layer 17 causes, so that this again closes the resulting gap (Fig. 4c).
  • either an existing support body 20 are exchanged for an enlarged support body 20a, or it is also possible that originally no support body 20 has been vulcanized into the recess 19. Then either an existing hole can be widened by introducing one of these over an excess support body 20a, or it is only then introduced a bore, for example, 2 mm to 3 mm diameter and inserted an oversize support body 20a, for example, 10 mm to 12 mm in the recess , Due to the fact that in this method the pushing out of the diameter smaller dimensioned earlier support body 20 is omitted, such a widening of the polymer layer 17 without removal of the respective piston 3,103,203,303,403 done.
  • Threaded support bodies may be made of different materials and may be curved.
  • the support body need not have the circular cross-sectional shape shown in Fig. 4c, but may also have, for example, an oval, elliptical or other shaped peripheral shape in adaptation to the thinned area. It is also possible to provide a plurality of recesses 19 side by side, whereby the expanded area is increased overall.

Abstract

A pump (1) with one or more pistons (3; 103; 203; 303; 403), which can be rotated, especially for conveying essentially liquid media, the piston (3; 103; 203; 303; 403), having at least regionally a surface layer (17; 117; 217; 317; 417) of a polymer, especially of an elastomer, is constructed so that at least one recess (19; 119; 219; 319; 419), into which a supporting body (20; 120; 220; 320; 420) can be introduced for expanding the polymer layer (17; 117; 217; 317; 417), is assigned to the polymer layer.

Description

Die Erfindung betrifft eine Pumpe mit einem oder mehreren rotierbaren Kolben nach dem Oberbegriff des Anspruchs 1 sowie ein Verfahren zum Ausgleich von verschleißbedingten Abnutzungen einer äußeren Polymerschicht eines Pumpenkolbens nach dem Oberbegriff des Anspruchs 11.The invention relates to a pump having one or more rotatable pistons according to the preamble of claim 1 and to a method for compensating for wear-related wear of an outer polymer layer of a pump piston according to the preamble of claim 11.

Eine solche Pumpe ist bekannt aus der GB-A-1302087 (entspricht der DE-A-2002518 desselben Anmelders).Such a pump is known from the GB-A-1302087 (equals to DE-A-2002518 same applicant).

Bei Drehkolbenpumpen, insbesondere zur Förderung von feststoffbeladenen Flüssigkeiten, ist eine Abdichtung des oder der Rotationskolben gegenüber der Wandung des Pumpraums sowie bei mehreren Kolben auch gegeneinander erforderlich. Je besser die Abdichtung gegenüber der Wandung bzw. der Kolben untereinander ist, desto höher ist der erreichte Wirkungsgrad.In rotary lobe pumps, in particular for the promotion of solids-laden liquids, a seal of the rotary piston or against the wall of the pump chamber and with several pistons against each other is required. The better the seal against the wall or the piston with each other, the higher the efficiency achieved.

Die DE-A- 20 02 518 zeigt eine Elastomerbeschichtung für Drehkolben von Pumpen, die für die Förderung feststoffbeladener Suspensionen eingesetzt werden. Eine derartige Beschichtung kann elastisch nachgeben, sofern Feststoffpartikel in den Spalt zwischen dem Kolben und der Wandung bzw. in den Spalt zwischen den möglichst dicht zueinander beabstandeten Rotationskolben eindringen. Dadurch wird ein Blockieren der Rotationsbewegung durch Feststoffe vermieden.The DE-A-20 02 518 shows an elastomer coating for rotary lobes of pumps, which are used for the promotion of solids loaded suspensions. Such a coating can yield elastically, provided that solid particles penetrate into the gap between the piston and the wall or into the gap between the rotational pistons spaced as closely as possible from each other. This prevents blocking of the rotational movement by solids.

Insbesondere durch derartig in den jeweiligen Spalt eindringende Feststoffe ist allerdings ein erhöhter Verschleiß der äußeren elastischen Schicht des oder der Kolben bewirkt. Mit zunehmendem Verschleiß wird die Dicke der Kunststoffschicht geringer, der Spalt zwischen den Kolben bzw. zwischen Kolben und Wandung damit vergrößert, wodurch der Wirkungsgrad der Pumpe sinkt. Ein dann notwendiger Austausch der Kolben ist jedoch sehr aufwendig.However, in particular by such penetrating into the respective gap solids increased wear of the outer elastic layer of the piston or is effected. With increasing wear, the thickness of the plastic layer becomes smaller, the gap between the pistons or between pistons and wall increases with it, whereby the efficiency of the pump decreases. A then necessary replacement of the piston is very expensive.

Die EP 0 599 333 B1 zeigt daher Kolbenteile, die einzeln auswechselbar sind, ohne den gesamten Kolben auswechseln zu müssen. Hierfür sind beispielsweise die Flügelspitzen als aufschiebbare Dichtleisten ausgebildet, die in einer schwalbenschwanzförmigen Führung befestigt sind und bei Bedarf ausgetauscht werden können. Der Fertigungsaufwand einer derartigen Ausgestaltung ist jedoch sehr hoch. Bei mehrflügligen Kolben müssen zudem in der Regel alle Kolbenspitzen gleichzeitig ausgewechselt werden, so daß insgesamt der Wartungsaufwand für ein solches Aufwechseln erhöht ist, da die Anzahl der auszuwechselnden Teile gegenüber einem Austausch eines Kolbens erheblich angewachsen ist. Zudem ist die Ausbildung einer solchen Schwalbenschwanzführung fertigungstechnisch sehr aufwendig.The EP 0 599 333 B1 shows therefore piston parts, which are individually interchangeable, without having to replace the entire piston. For this purpose, for example, the wing tips are designed as push-on sealing strips, which are fastened in a dovetail-shaped guide and can be replaced if necessary. However, the production cost of such a design is very high. In mehrflügligen piston also usually all the piston tips must be replaced at the same time, so that overall the maintenance costs for such replacement is increased, since the number of parts to be replaced compared to a replacement of a piston has grown significantly. In addition, the formation of such a dovetail guide manufacturing technology is very expensive.

Der Erfindung liegt das Problem zugrunde, dem verschleißbedingten Abnutzen einer äußeren Polymerschicht eines Pumpenkolbens mit möglichst wenig Aufwand entgegenzuwirken.The invention is based on the problem to counteract the wear-related wear of an outer polymer layer of a pump piston with the least possible effort.

Die Erfindung löst dieses Problem durch eine Pumpe mit den Merkmalen des Anspruchs 1 sowie durch ein Verfahren mit den Merkmalen des Anspruchs 11. Vorteilhafte Ausgestaltungen der Erfindung sind in den Ansprüchen 2 bis 10 angegeben.The invention solves this problem by a pump having the features of claim 1 and by a method having the features of claim 11. Advantageous embodiments of the invention are specified in claims 2 to 10.

Mit der erfindungsgemäßen Ausbildung einer Pumpe ist ein Nachstellen einer äußeren Verschleißschicht des Kolbens ermöglicht. Durch bedarfsgerechtes Einbringen eines Stützkörpers in die vorgesehene Ausnehmung kann einer Materialverdünnung der Polymerschicht dahingehend Rechnung getragen werden, daß die Ausnehmung durch Einbringen des Stützkörpers aufgeweitet wird und dadurch die Polymerschicht auf in etwa ihre ursprüngliche Dicke gedehnt wird. Eine derartige Ausnehmung kann sich sowohl im wesentlichen entlang einer Anlagelinie des Kolbens an eine Wandung des Pumpraums erstrecken, also einer radialen Verdünnung der äußeren Polymerschicht durch Einbringen eines Stützkörpers entgegenwirken, als auch im wesentlichen senkrecht zur Rotationsachse angeordnet sein, so daß das Einbringen des Stützkörpers die quer zum axialen Verlauf gegen die Wandung des Pumpraums abdichtenden Kolbenbereiche, die ebenfalls einem Verschleiß ausgesetzt sind, aufweitet.With the formation of a pump according to the invention an adjustment of an outer wear layer of the piston is made possible. By appropriate introduction of a support body in the intended recess can one Material dilution of the polymer layer to be taken into account so that the recess is widened by introducing the support body and thereby the polymer layer is stretched to about its original thickness. Such a recess may extend substantially along a contact line of the piston to a wall of the pump chamber, so counteract a radial dilution of the outer polymer layer by introducing a support body, as well as be arranged substantially perpendicular to the axis of rotation, so that the introduction of the support body transverse to the axial course against the wall of the pump chamber sealing piston areas, which are also exposed to wear, expands.

Wenn besonders vorteilhaft ein Sortiment verschiedener Stützkörper unterschiedlicher Ausmaße zur Verfügung steht, kann einer verschleißbedingten Materialverdünnung verschiedenen Ausmaßes Rechnung getragen werden.If an assortment of different support bodies of different dimensions is particularly advantageous, wear-related material dilution of various dimensions can be taken into account.

Weitere Vorteile und Einzelheiten ergeben sich aus einem nachfolgend beschriebenen und in der Zeichnung dargestellten Ausführungsbeispiels des Gegenstandes der Erfindung. In der Zeichnung zeigt:

Fig. 1
eine schematische Draufsicht auf eine zweiflüglige Rotationskolbenpumpe mit jeweils einer die Kolben umgebenden Polymerschicht und achsparallel eingebrachten Stützkörpern,
Fig. 2
einen Kolben nach Fig. 1 in perspektivischer, teilweise aufgebrochener Darstellung,
Fig. 3
einen verwundenen Kolben mit seiner maximalen radialen Erstreckung folgenden Ausnehmungen und eingebrachten Stützkörpern in perspektivischer, teilweise aufgebrochener Darstellung,
Fig. 4
den schematischen Ablauf von ursprünglichem Zustand, außenseitig verschlissener Polymerlage und aufgeweiteter Polymerlage durch Einbringen eines vergrößerten Stützkörpers in schematischer, abgebrochener Draufsicht, darin
Fig. 4a
den ursprünglichen Zustand,
Fig. 4b
den Kolben bei teilweise verschlissener Polymerschicht,
Fig. 4c
den Kolben bei eingebrachtem Stützkörper vergrößerten Durchmessers und dadurch aufgeweiteter Verschleißschicht,
Fig. 5
eine Rotationskolbenpumpe mit einem vielflügligen und flexiblen Rotationskolben,
Fig. 6
einen Kolben in ähnlicher Ansicht wie in Fig. 1, wobei Kolbenaußenumfang und Polymerschicht aufeinander abgestimmt und verdrehgesichert gegeneinander gehalten sind,
Fig. 7
eine ähnliche Ansicht wie Fig. 2 eines Kolbens, der an axial zueinander beabstandeten Randbereichen Ausnehmungen für Stützkörper aufweist, wobei sich die eingebrachten Stützkörper quer zur axialen Ausdehnung erstrecken,
Fig. 8
eine Draufsicht entlang der Linie VIII-VIII in Fig. 7.
Further advantages and details emerge from an embodiment of the subject matter of the invention described below and shown in the drawing. In the drawing shows:
Fig. 1
1 is a schematic plan view of a two-lobed rotary piston pump, each with a polymer layer surrounding the piston and support bodies introduced axially parallel,
Fig. 2
a piston according to Fig. 1 in a perspective, partially broken view,
Fig. 3
a twisted piston with its maximum radial extent following recesses and introduced supporting bodies in a perspective, partially broken view,
Fig. 4
the schematic sequence of the original state, worn on the outside polymer layer and expanded polymer layer by introducing an enlarged support body in a schematic, broken plan view, therein
Fig. 4a
the original condition,
Fig. 4b
the piston with partially worn polymer layer,
Fig. 4c
the piston when the support body of increased diameter and thus widened wear layer,
Fig. 5
a rotary piston pump with a vielflügligen and flexible rotary piston,
Fig. 6
a piston in a similar view as in Fig. 1, wherein the piston outer circumference and the polymer layer are matched and held against rotation against each other,
Fig. 7
2 shows a view similar to FIG. 2 of a piston which has recesses for support bodies at axially spaced-apart edge regions, wherein the introduced support bodies extend transversely to the axial extent,
Fig. 8
a plan view along the line VIII-VIII in Fig. 7.

Die Pumpe 1 gemäß der in Fig. 1 dargestellten Ausführung weist einen Pumpraum 2 auf, in dem zwei gleichartig ausgebildete Kolben 3,4 aufeinander abrollen und eine Flüssigkeit von einem Eintrittsspalt 5 zu einer Austrittsöffnung 6 befördern. Die Kolben 3 und 4 sind dabei jeweils zweiflüglig ausgebildet, was allerdings nicht zwingend ist. Die Kolben laufen in Richtung der Pfeile 7,8 um die Drehachsen 9,10 um und sind lösbar über Paßfedern 11,12 auf den Wellen 13,14 gehalten.The pump 1 according to the embodiment shown in Fig. 1 has a pump chamber 2, in which two identically designed piston 3,4 roll on each other and convey a liquid from an entrance slit 5 to an outlet opening 6. The pistons 3 and 4 are each formed with two lobes, which is not mandatory. The pistons run in the direction of the arrows 7, 8 about the axes of rotation 9, 10 and are held detachably by means of paralleling springs 11, 12 on the shafts 13, 14.

Die Flügelspitzen 3a,3b bzw. 4a,4b werden während der Rotation in dichtem Abstand an den Wandungen 15,16 des Pumpraums 2 sowie an dem jeweils anderem Kolben 3 bzw. 4 vorbeigeführt. Außenseitig sind die Kolben 3,4 umlaufend - zumindest jedoch an den hoch belasteten Flügelspitzen 3a,3b bzw. 4a,4b - von einer elastischen Polymerschicht, insbesondere einer Elastomerschicht, umgeben. Diese dichtet die Kolben 3,4 gegeneinander sowie gegen die Wandungen 15,16 des Pumpraums 2 ab. In dem Kolben nach Fig. 1 (sh. auch Fig. 2) ist in den Flügelspitzen 3a,3b,4a,4b jeweils eine Ausnehmung innerhalb der Elastomerschicht 17,18 angeordnet, die sich parallel zur Drehachse 9 bzw. 10 erstreckt und zur Aufnahme eines Stützkörpers 20 vorgesehen ist. Die Ausnehmung 19 ist gemäß dem Ausführungsbeispiel vollständig innerhalb der Elastomerlage 17. bzw. 18 angeordnet.The wing tips 3a, 3b and 4a, 4b are guided during the rotation at a close distance to the walls 15,16 of the pump chamber 2 and the respective other piston 3 and 4 respectively. On the outside, the pistons 3, 4 are encircled by an elastic polymer layer, in particular an elastomer layer, at least around the highly loaded wing tips 3a, 3b or 4a, 4b. This seals the piston 3,4 against each other and against the walls 15,16 of the pump chamber 2 from. In the piston according to Fig. 1 (see also Fig. 2) is in the wing tips 3a, 3b, 4a, 4b each have a recess disposed within the elastomer layer 17,18, which extends parallel to the axis of rotation 9 and 10 and for receiving a support body 20 is provided. The recess 19 is complete according to the embodiment disposed within the elastomer layer 17 and 18, respectively.

In Fig. 3 ist ein verwundener Kolben 103 dargestellt, der ebenfalls mittels einer Paßfeder 111 auf einer Welle 113 festgelegt ist und um eine Drehachse 109 drehbar ist. Die Ausnehmungen 119 sind dabei spiralförmig in die Flügelspitzen 103a,103b,103c, die sich ebenfalls spiralförmig bezüglich der Welle 113 erstrecken, eingebracht. Die hier gezeigten eingebrachten Stützkörper 120 können biegbar sein oder mit einer entsprechenden Krümmung gefertigt sein. Im Ausführungsbeispiel ist der Kolben 103 dreiflüglig. Dieses ist wiederum nicht zwingend. In einer Pumpe 1 können mehrere Kolben 103 aufeinander abgleiten.In Fig. 3, a twisted piston 103 is shown, which is also fixed by means of a feather key 111 on a shaft 113 and about a rotation axis 109 is rotatable. The recesses 119 are thereby spirally introduced into the wing tips 103a, 103b, 103c, which also extend helically with respect to the shaft 113. The introduced support bodies 120 shown here may be bendable or be made with a corresponding curvature. In the exemplary embodiment, the piston 103 is dreiflüglig. This is again not mandatory. In a pump 1, a plurality of pistons 103 can slide on each other.

In einem weiteren Ausführungsbeispiel (Fig. 5) ist ein vielflügliger Kolben (achtflüglig) 203 einer Zellenpumpe dargestellt, der auf einer Welle 213 gehalten ist und in Richtung 207 um eine Drehachse 209 umläuft. Der Kolben 203 zeigt dabei eine Oberflächenlage, die vollständig aus einem Polymer besteht und den Kolben 203 im wesentlichen vollständig umfaßt. In die Kolbenspitzen 203a bis 203h sind Ausnehmungen 219 jeweils achsparallel eingeformt, die zur Aufnahme von Stützkörpern 220 dienen können.In a further exemplary embodiment (FIG. 5), a multi-winged piston (eight-winged) 203 of a cell pump is shown, which is held on a shaft 213 and rotates in the direction 207 about an axis of rotation 209. The piston 203 shows a surface layer which consists entirely of a polymer and the piston 203 substantially completely. In the piston tips 203a to 203h recesses 219 are each formed axially parallel, which can serve to receive support bodies 220.

In Fig. 6.ist ein weiterer Kolben 303 dargestellt, der insgesamt dem Kolben 3 in Fig. 1 im wesentlichen entspricht, jedoch Einformungen 321 und 322 an den Flügelspitzen 303a und 303b aufweist, um dadurch einen sicheren Halt gegen ein Abheben der Polymerlage 317 und auch eine Verdrehsicherung der Polymerlage 317 zu gewährleisten. Am unteren Ende in Fig. 6 (Flügelspitze 303a) ist eine Ausnehmung 319, die als achsparalleler Kanal ausgebildet ist, vor Einbringen eines Stützkörpers gezeigt. Eine Abflachung der äußeren Polymerlage 317, begründet durch Verschleiß, ist hierbei sichtbar. An der oberen Flügelspitze 303b ist die Situation nach Einbringen eines Stützkörpers 320 dargestellt, wodurch die Ausnehmung 319 aufgeweitet ist und somit eine Dehnung der umliegenden Elastomerschicht in Richtung des Pfeils 323 bewirkt ist.In Fig. 6.isther another piston 303 is shown, which generally corresponds to the piston 3 in Fig. 1 substantially, however, has indentations 321 and 322 at the wing tips 303 a and 303 b, thereby a secure hold against lifting of the polymer layer 317 and To ensure an anti-rotation of the polymer layer 317. At the lower end in Fig. 6 (wing tip 303a) is a recess 319, which is designed as an axially parallel channel, shown before introducing a support body. A flattening of the outer polymer layer 317, due to wear, is visible here. At the upper wing tip 303b, the situation after insertion of a support body 320 is shown, whereby the recess 319 is widened and thus an elongation of the surrounding elastomer layer in the direction of the arrow 323 is effected.

In Fig. 7 ist ein Kolben 403 dargestellt, dessen Ausnehmungen 419 senkrecht zur Drehachse 409 verlaufen, so daß durch Einbringen von Stützkörpern 420 eine Aufweitung der oberen und unteren Begrenzungsebene, die senkrecht zur Drehachse 409 liegt, bewirkt wird, wodurch dann an Stelle oder in Ergänzung zur Aufweitung der Flügelspitzen auch eine Aufweitung der quer verlaufenden Flächen möglich ist.In Fig. 7, a piston 403 is shown, the recesses 419 are perpendicular to the axis of rotation 409, so that by introducing support members 420, a widening of the upper and lower boundary plane, which is perpendicular to the axis of rotation 409 is effected, which then in place or in Addition to the widening of the wing tips and a widening of the transverse surfaces is possible.

In Fig. 4 ist der Ablauf des erfindungsgemäßen Verfahrens zum Ausgleich von Abnutzungen der äußeren Polymerschicht dargestellt: In Fig. 4a ist die Polymerschicht 17 auch im Bereich der Flügelspitze 3a intakt und weist ihre volle ursprüngliche Breite auf. In die Ausnehmung 19 ist ein dem Durchmesser des durch die Ausnehmung 19 gebildeten Kanals entsprechender Stützkörper, beispielsweise ein Stahlstift oder auch ein Stift aus Kunststoff, eingebracht.FIG. 4 shows the sequence of the method according to the invention for compensating for wear of the outer polymer layer. In FIG. 4a, the polymer layer 17 is also intact in the region of the wing tip 3a and has its full original width. In the recess 19 is a the diameter of the channel formed by the recess 19 corresponding support body, for example, a steel pin or a pin made of plastic, introduced.

In der Darstellung nach Fig. 4b ist die Polymerlage 17 verdünnt, es bildet sich ein Spalt zwischen der Wandung 15 und der äußeren Begrenzung des Kolbens 3 aus.In the illustration according to FIG. 4b, the polymer layer 17 is thinned, a gap is formed between the wall 15 and the outer boundary of the piston 3.

Deswegen wird der Stützkörper 20 entfernt und ein im Umfang erweiterter Stützkörper 20a eingesetzt, der durch seinen größeren Durchmesser eine Aufdehnung der Ausnehmung 19 und somit auch der sie umgebenden Polymerschicht 17 bewirkt, so daß diese den entstandenen Spalt wieder schließt (Fig. 4c).Therefore, the support body 20 is removed and a circumferentially expanded support body 20a is used, which by its larger diameter an expansion the recess 19 and thus also the surrounding polymer layer 17 causes, so that this again closes the resulting gap (Fig. 4c).

Dabei kann entweder ein vorhandener Stützkörper 20 gegen einen erweiterten Stützkörper 20a ausgetauscht werden, oder es ist auch möglich, daß ursprünglich noch kein Stützkörper 20 in die Ausnehmung 19 einvulkanisiert worden ist. Dann kann entweder eine bestehende Bohrung durch Einbringen eines dieser gegenüber ein Übermaß aufweisenden Stützkörpers 20a aufgeweitet werden, oder es wird dann erst eine Bohrung von beispielsweise 2 mm bis 3 mm Durchmesser eingebracht und ein Übermaßstützkörper 20a von beispielsweise 10 mm bis 12 mm in die Ausnehmung eingeschoben. Dadurch, daß bei diesem Verfahren das Ausschieben des im Durchmesser geringer bemaßten früheren Stützkörpers 20 entfällt, kann ein derartiges Aufweiten der Polymerschicht 17 ohne Ausbau des jeweiligen Kolbens 3,103,203,303,403 erfolgen.In this case, either an existing support body 20 are exchanged for an enlarged support body 20a, or it is also possible that originally no support body 20 has been vulcanized into the recess 19. Then either an existing hole can be widened by introducing one of these over an excess support body 20a, or it is only then introduced a bore, for example, 2 mm to 3 mm diameter and inserted an oversize support body 20a, for example, 10 mm to 12 mm in the recess , Due to the fact that in this method the pushing out of the diameter smaller dimensioned earlier support body 20 is omitted, such a widening of the polymer layer 17 without removal of the respective piston 3,103,203,303,403 done.

Besonders vorteilhaft werden als Stützkörper 20,20a mit einem selbstschneidenden Gewinde versehene Gewindestifte verwendet. Diese können auch bei eingesetztem Kolben 3 aus den Ausnehmungen 19 wieder herausgedreht werden, so daß auch auf diese Weise ein Ausschieben eines Stützkörpers 20, der einen Ausbau des Kolbens 3 erfordern würde, entbehrlich ist beim Austausch von Stützkörpern 20,20a. Auch Stützkörper mit Gewinde können aus verschiedenen Materialien bestehen und gegebenenfalls gekrümmt sein.Particularly advantageous as a support body 20,20a provided with a self-tapping threaded screws. These can be unscrewed out of the recesses 19 even with inserted piston 3, so that in this way a pushing out of a support body 20, which would require an expansion of the piston 3, is unnecessary when replacing support bodies 20,20a. Threaded support bodies may be made of different materials and may be curved.

Es kann ein Sortiment von Stützkörpern 20,20a,120,220,320,420 unterschiedlicher Durchmesser - mit oder ohne Gewinde - bereitgehalten werden. Zur Entscheidung, welcher eingepaßt werden soll, wird zunächst der Spalt zwischen der Wandung 15 und der Elastomerlage 17 ausgemessen und dann der entsprechend passende Stützkörper 20 bzw. 20a,120,220,320,420 gewählt.It can be an assortment of support bodies 20,20a, 120,220,320,420 different diameters - with or without thread - are kept. To decide which is to be fitted, first the gap between the wall 15 and the elastomer layer 17 and then the correspondingly fitting support body 20 or 20a, 120,220,320,420 selected.

Der Stützkörper muß nicht die in Fig. 4c gezeigte kreisrunde Querschnittsgestalt haben, sondern kann auch in Anpassung an den verdünnten Bereich beispielsweise eine ovale, elliptische oder anders geformte Umfangsgestalt haben. Auch ist es möglich, nebeneinander mehrere Ausnehmungen 19 vorzusehen, wodurch der aufgedehnte Bereich insgesamt vergrößert wird.The support body need not have the circular cross-sectional shape shown in Fig. 4c, but may also have, for example, an oval, elliptical or other shaped peripheral shape in adaptation to the thinned area. It is also possible to provide a plurality of recesses 19 side by side, whereby the expanded area is increased overall.

Insgesamt ist eine elastische Verformung der Lage 17 erreicht, die damit eine Ausdehnung nach außen erfährt und somit verschleißbedingte Materialverdünnungen ausgleicht.Overall, an elastic deformation of the layer 17 is achieved, which thus experiences an expansion to the outside and thus compensates for wear-induced material dilutions.

Claims (11)

  1. Pump (1) having one or more rotatable pistons (3, 103, 203, 303, 403), particularly for pumping substantially liquid media, the piston (3, 103, 203, 303, 403) having, at least in a region or regions, a surface layer (17, 117, 217, 317, 417) of a polymer, and in particular of an elastomer, and a supporting body (20, 120, 220, 320, 420), characterised in that there is arranged within the layer of polymer at least one hole (19, 119, 219, 319, 419) into which the supporting body (20, 120, 220, 320, 420), which enlarges the hole due to its larger diameter, is inserted to expand the layer of polymer (17, 117, 217, 317, 417) without the piston being removed.
  2. Pump according to claim 1, characterised in that the recess (19, 219, 319, 419) is in the form of a passage to receive a supporting body (20, 220, 320, 420) substantially in rod form.
  3. Pump according to claim 2, characterised in that the passage is situated in the region of a line at which the piston (3, 103, 203, 203, 303, 403) rests against a wall (15, 16) of the pumping chamber (2).
  4. Pump according to claim 2 or 3, characterised in that the alignment of the passage (19, 219, 319) is substantially parallel to the axis.
  5. Pump according to one of claims 1 to 4, characterised in that the recess (419) extends substantially perpendicularly to the axis of rotation (9) of the piston or pistons (403) and is situated in the region of piston edges (403c, 403d) which lie perpendicular to the axis (9).
  6. Pump according to one of claims 1 to 5, characterised in that it has a multi-lobed or vaned piston (3, 103, 203, 303) and each lobe or vane is provided with at least one recess (19, 119, 219, 319) in the region in which it rests against a surrounding wall (15, 16) of the pumping chamber (2).
  7. Pump according to one of foregoing claims 1 to 6, characterised in that the pump (1) has two rotary pistons (3,103, 203, 403) which slide over one another.
  8. Pump according to one of foregoing claims 1 to 7, characterised in that the pump (1) has at least one rotary piston (203) which is twisted along the axial path followed by it and the recess (219) follows a line of maximum radial extent of this piston (203).
  9. Pump according to one of claims 1 to 8, characterised in that the recess (19, 119, 219, 319, 419) can be expanded to suit requirements by introducing supporting bodies (20, 20a, 120, 220, 320, 420) of different diameters.
  10. Pump according to one of claims 1 to 9, characterised in that the supporting body (20, 20a, 120, 220, 320, 420) is formed by a metal pin.
  11. Method of compensating for wear-related ablation of an outer layer of polymer on a pump piston, and in particular on a rotary piston of a liquid-pumping pump,
    characterised in that the layer of polymer is provided with a hole and a supporting body which enlarges the hole due to its larger diameter is inserted in the said hole without the piston being removed and an enlargement is thereby produced in the width of the layer of polymer.
EP00941960A 2000-05-18 2000-05-18 Rotating piston pump Expired - Lifetime EP1282777B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2000/004519 WO2001088377A1 (en) 2000-05-18 2000-05-18 Rotating piston pump

Publications (2)

Publication Number Publication Date
EP1282777A1 EP1282777A1 (en) 2003-02-12
EP1282777B1 true EP1282777B1 (en) 2007-08-15

Family

ID=8163945

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00941960A Expired - Lifetime EP1282777B1 (en) 2000-05-18 2000-05-18 Rotating piston pump

Country Status (6)

Country Link
US (1) US6827565B1 (en)
EP (1) EP1282777B1 (en)
JP (1) JP2004527689A (en)
AT (1) ATE370329T1 (en)
DE (1) DE50014574D1 (en)
WO (1) WO2001088377A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010012494U1 (en) * 2010-09-13 2011-12-15 Hugo Vogelsang Maschinenbau Gmbh Rotary pump and rotary piston
US9383013B2 (en) 2011-08-03 2016-07-05 Lobepro, Inc. Piston with replaceable and/or adjustable surfaces
DE102013100677B4 (en) * 2013-01-23 2017-03-02 Roediger Vacuum Gmbh Rotary pump
EP2971774B1 (en) 2013-03-15 2021-01-27 Lobepro, Inc. Piston with replaceable and/or adjustable surfaces
DE202014001511U1 (en) 2014-02-20 2015-05-21 Hugo Vogelsang Maschinenbau Gmbh Insertion device for multi-layer fertilization

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US2455194A (en) * 1943-11-10 1948-11-30 Rumsey Lillian Gray Rotary flexible vane pump
US2605715A (en) * 1949-02-08 1952-08-05 David O Brant Rotary pump piston
FR1209705A (en) 1958-08-30 1960-03-03 Pump or compressor with curved single screw rotor made of powerfully elastic material
US3078807A (en) * 1958-10-16 1963-02-26 William D Hewit Dual-action displacement pump
US2999466A (en) * 1959-09-23 1961-09-12 Ingersoll Rand Co Pump
DE2002518C3 (en) 1970-01-21 1982-04-01 Fa. Hugo Vogelsang, 4571 Bunnen Slurry pump
JPS48104107A (en) * 1972-04-14 1973-12-27
US3999894A (en) * 1973-04-23 1976-12-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Compressor assembly
US4270440A (en) * 1979-02-22 1981-06-02 Weatherford/Dmc High pressure piston and seal
DE3324899C2 (en) 1983-07-09 1986-07-17 Maschinenfabriken Bernard Krone Gmbh, 4441 Spelle Machine for harvesting corn or the like. Stalk-like crops
DE8602009U1 (en) 1986-01-28 1987-07-23 Boerger, Alois, 4280 Borken, De
DE3707722A1 (en) * 1987-03-11 1988-09-29 Alois Boerger Rotor pump, especially for pumping liquids containing solids
US4940402A (en) * 1988-11-08 1990-07-10 Brunswick Corporation High pressure and high lift pump impeller
DE9216170U1 (en) 1992-11-27 1993-01-14 Boerger, Alois, 4280 Borken, De
DE4313457C1 (en) * 1993-04-24 1994-05-11 Alois Boerger Pump with intermeshing lobed rotors - has adjusting mechanism in each lobe thrusting elastomer cover at tip outwards and has adjusting body sliding in groove inside lobe
JPH09151875A (en) * 1995-11-30 1997-06-10 Sanyo Electric Co Ltd Refrigerant compressor
US5988649A (en) * 1997-05-01 1999-11-23 E. I. Du Pont De Nemours And Company Fractured seal ring

Also Published As

Publication number Publication date
US6827565B1 (en) 2004-12-07
EP1282777A1 (en) 2003-02-12
WO2001088377A8 (en) 2002-07-25
ATE370329T1 (en) 2007-09-15
WO2001088377A1 (en) 2001-11-22
JP2004527689A (en) 2004-09-09
DE50014574D1 (en) 2007-09-27

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