EP0933530B1 - Internal gear pump free from inner crescent space - Google Patents

Internal gear pump free from inner crescent space Download PDF

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Publication number
EP0933530B1
EP0933530B1 EP98120951A EP98120951A EP0933530B1 EP 0933530 B1 EP0933530 B1 EP 0933530B1 EP 98120951 A EP98120951 A EP 98120951A EP 98120951 A EP98120951 A EP 98120951A EP 0933530 B1 EP0933530 B1 EP 0933530B1
Authority
EP
European Patent Office
Prior art keywords
sealing element
pinion
groove
profiled groove
geared wheel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98120951A
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German (de)
French (fr)
Other versions
EP0933530A1 (en
Inventor
Franz Arbogast
Peter Peiz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Turbo GmbH and Co KG
Original Assignee
Voith Turbo GmbH and Co KG
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Filing date
Publication date
Application filed by Voith Turbo GmbH and Co KG filed Critical Voith Turbo GmbH and Co KG
Publication of EP0933530A1 publication Critical patent/EP0933530A1/en
Application granted granted Critical
Publication of EP0933530B1 publication Critical patent/EP0933530B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0007—Radial sealings for working fluid
    • F04C15/0019—Radial sealing elements specially adapted for intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • the invention relates to a sickle-free internal gear pump with a internally toothed ring gear, a pinion that meshes with the ring gear and a housing that receives the ring gear and pinion.
  • Such an internal gear pump is, for example, from EP 0 607 497 B1 known.
  • a sealing element used on the opposite Tooth tip of the pinion or the ring gear when operating the Internal gear pump slides.
  • the sealing element is provided with a channel, which extends through the sealing element and a conductive Connection between the bottom of the profile groove and the sealing surface of the Manufactures sealing element. This ensures that the sealing element in front Reaching the dead center receives the pressure that is necessary to achieve this Press the sealing element against the opposite tooth head. To Passing through the dead center, however, does not mean all of the pump generated working pressure on the sealing element, but only a partial pressure.
  • each sealing element mentioned is in the profile groove in the radial direction limited movement.
  • the outer surface of each sealing element forms thus necessarily a gap with the inner surface of the profile groove.
  • the invention has for its object a sickle Internal gear pump according to the preamble of claim 1 shape that the contact pressure of the sealing element against the head of opposite tooth remain essentially the same size, especially at high system pressures.
  • Claim 2 describes an advantageous development in which in the area of a dovetail-shaped part either in the Outer surface of the sealing element or in the inner surface of the Profile groove is recessed at least one groove.
  • the inventors have recognized that the width of the gap between the Outer surface of the sealing element and the inner surface of the profile groove at Operation changes, especially with a radial displacement of the Sealing element. This will change the amount of control oil used by the Pressure side flows through the mentioned gap to the profile groove base. Accordingly, the inventors suggest that the width of the print side existing gap remains unchanged, regardless of the prevailing Operating parameters.
  • Sealing element can be provided with appropriately designed grooves.
  • the internal gear pump shown in Fig. 1 is a sickle-less, head-sealing and playful. It comprises a ring gear 1, as essential elements Pinion 2 and a housing 3.
  • the ring gear 1 is provided with holes 1.1. These provide a conductive connection between the environment of the Ring gear 1 on the one hand and the space between ring gear 1 and pinion 2 on the other hand. Sealing elements 4 are in each case in the teeth of the ring gear used.
  • Pinion 2 is wedged on a pinion shaft 2.1, which in the direction of arrow X circulates.
  • the housing 3 has a suction port 3.1 and a pressure port 3.2 on.
  • the teeth 1.3 of the ring gear and the teeth 2.2 of the pinion have one certain axial width. Ring gear 1 and pinion 2 are eccentric to each other stored. In addition, the number of teeth 2.2 of the pinion 2 is one less than the number of teeth 1.3 of the ring gear 1.
  • Each tooth 1.3 of the Ring gear 1 has a profile groove 1.4.
  • a Sealing element 4 used in each profile groove 1.4. This is on part of its cross section dovetail-shaped.
  • Each sealing element 4 has one through channel 4.1 on. This provides a conductive connection between the interior or profile base 1.5 and the sealing surface 4.2 of the Sealing element 4 ago.
  • the sealing element 4 can radial movement while the internal gear pump is running perform.
  • the other arrows shown on the middle sealing element represent the course of the control oil flow.
  • the Control oil flow initially coming from the pressure side into a gap 5 the between the outer surface of the sealing element 4 and the inner surface of the Profile groove 1.4 is formed.
  • a groove 6 machined into the sealing element In the dovetail part of the Sealing element is a groove 6 machined into the sealing element.
  • a continuous groove 7 is provided in the middle Part of the sealing element 4.
  • the groove 6 is designed and arranged so that the control oil flow from through groove 7 to the groove base 1.5 is not throttled.
  • the wide of the entire channel is also at a radial displacement of the Sealing element 4 always one and the same.
  • the first section of this Flow channel, namely the gap 5, is parallel to the contact surface 8 and thus its gap height is independent of radial movements Y.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

The housing has a suction connection (3.1) and a pressure connection (3.2). The hollow wheel (1) has radial breakthroughs (1.1), which produce a conductive connection between the tooth base and the cover surface of the hollow wheel. In the tooth heads of the hollow wheel and the pinion (2) is a profile groove, in which a sealing component (4) is inserted. The sealing component can slide on the opposing tooth head of the pinion and the hollow wheel. The sealing component is provided with a channel, which produces a conductive connection between the profile groove base and the sealing surface of the sealing component.

Description

Die Erfindung betrifft eine sichellose Innenzahnradpumpe mit einem innenverzahnten Hohlrad, einem Ritzel, das mit dem Hohlrad kämmt und einem Gehäuse, das Hohlrad und Ritzel aufnimmt.The invention relates to a sickle-free internal gear pump with a internally toothed ring gear, a pinion that meshes with the ring gear and a housing that receives the ring gear and pinion.

Eine solche Innenzahnradpumpe ist beispielsweise aus EP 0 607 497 B1 bekannt geworden. Dabei sind die Zahnköpfe des Hohlrades bzw. die Zahnköpfe des Ritzels jeweils mit einer Profilnut versehen. In die einzelne Profilnut ist ein Dichtelement eingesetzt, das am gegenüberliegenden Zahnkopf des Ritzels bzw. des Hohlrades beim Betrieb der Innenzahnradpumpe gleitet. Das Dichtelement ist mit einem Kanal versehen, der sich durch das Dichtelement hindurcherstreckt und eine leitende Verbindung zwischen dem Grund der Profilnut und der Dichtfläche des Dichtelementes herstellt. Damit wird sichergestellt, daß das Dichtelement vor Erreichen des Totpunktes den Druck erhält, der notwendig ist, um das Dichtelement gegen den gegenüberliegenden Zahnkopf anzudrücken. Nach Durchlaufen des Totpunktes steht jedoch nicht der gesamte, von der Pumpe erzeugte Arbeitsdruck auf dem Dichtelement, sondern nur ein Teildruck.Such an internal gear pump is, for example, from EP 0 607 497 B1 known. The tooth tips of the ring gear or Provide the tooth tips of the pinion with a profile groove. In the individual Profile groove is a sealing element used on the opposite Tooth tip of the pinion or the ring gear when operating the Internal gear pump slides. The sealing element is provided with a channel, which extends through the sealing element and a conductive Connection between the bottom of the profile groove and the sealing surface of the Manufactures sealing element. This ensures that the sealing element in front Reaching the dead center receives the pressure that is necessary to achieve this Press the sealing element against the opposite tooth head. To Passing through the dead center, however, does not mean all of the pump generated working pressure on the sealing element, but only a partial pressure.

Innenzahnradpumpen mit solchen Dichtelementen haben sich grundsätzlich bewährt.Internal gear pumps with such sealing elements have fundamentally proven.

Die genannten Dichtelemente sind in der Profilnut in radialer Richtung begrenzt verschiebbar. Die Außenfläche eines jeden Dichtelementes bildet somit mit der Innenfläche der Profilnut notwendigerweise einen Spalt. Durch diesen Spalt gelangt Steueröl von der Druckseite eines Zahnkopfes mit eingesetztem Dichtelement in den Innenraum der Profilnut, d.h. zum Profilnutgrund. Dort tritt Steueröl in den Kanal ein, der durch das Dichtelement hindurchgeführt ist, um an der Dichtfläche des Dichtelementes im Bereich des gegenüberliegenden Zahnes von Ritzel bzw. Hohlrad wieder auszutreten. The sealing elements mentioned are in the profile groove in the radial direction limited movement. The outer surface of each sealing element forms thus necessarily a gap with the inner surface of the profile groove. By control oil passes through this gap from the pressure side of a tooth head inserted sealing element into the interior of the profile groove, i.e. to the Profilnutgrund. There control oil enters the channel through the sealing element is passed to the sealing surface of the sealing element in the area of opposite tooth of pinion or ring gear to emerge again.

Es hat sich gezeigt, daß trotz des Kanales, der sich durch das Dichtelement hindurchzieht, die Steuerung des Ölflusses und damit des Druckes, mit dem das Dichtelement an den gegenüberliegenden Zahnkopf angedrückt wird, nicht optimal ist. Insbesondere bei hohen Drücken, beispielsweise bei Drücken von 250 bar, treten Schwankungen der Anpreßkraft auf. Diese Schwankungen sind nachteilig, insbesondere bezüglich der Dichtwirkung zwischen Dichtelement einerseits und gegenüberliegendem Zahn andererseits, und damit für den Wirkungsgrad und die übrige Arbeitsweise der gesamten Innenzahnradpumpe.It has been shown that despite the channel, which is through the sealing element pulls through, the control of the oil flow and thus the pressure with which the sealing element is pressed onto the opposite tooth head, is not optimal. Especially at high pressures, for example at Pressures of 250 bar cause fluctuations in the contact pressure. This Fluctuations are disadvantageous, especially with regard to the sealing effect between the sealing element on the one hand and the opposite tooth on the other hand, and thus for the efficiency and the rest of the way of working the entire internal gear pump.

Der Erfindung liegt die Aufgabe zugrunde, eine sichellose Innenzahnradpumpe gemäß dem Oberbegriff von Anspruch 1 derart zu gestalten, daß die Anpreßkräfte des Dichtelementes gegen den Kopf des gegenüberliegenden Zahnes im wesentlichen gleich groß bleiben, insbesondere bei hohen Systemdrücken.The invention has for its object a sickle Internal gear pump according to the preamble of claim 1 shape that the contact pressure of the sealing element against the head of opposite tooth remain essentially the same size, especially at high system pressures.

Diese Aufgabe wird durch die Merkmale von Anspruch 1 gelöst. Anspruch 2 beschreibt eine vorteilhafte Weiterbildung, bei der im Bereich eines schwalbenschwanzförmigen Teils entweder in die Außenfläche des Dichtelements oder in die Innenfläche der Profilnut wenigstens eine Nut eingelassen ist.This object is solved by the features of claim 1. Claim 2 describes an advantageous development in which in the area of a dovetail-shaped part either in the Outer surface of the sealing element or in the inner surface of the Profile groove is recessed at least one groove.

Die Erfinder haben erkannt, daß sich die Weite des Spaltes zwischen der Außenfläche des Dichtelementes und der Innenfläche der Profilnut beim Betrieb ändert, insbesondere bei einer Radialverschiebung des Dichtelementes. Hierdurch ändert sich die Menge des Steueröles, das von der Druckseite durch den genannten Spalt hindurch zum Profilnutgrund strömt. Demgemäß schlagen die Erfinder vor, daß die Weite des auf der Druckseite befindlichen Spaltes unverändert bleibt, ungeachtet der jeweils herrschenden Betriebsparameter.The inventors have recognized that the width of the gap between the Outer surface of the sealing element and the inner surface of the profile groove at Operation changes, especially with a radial displacement of the Sealing element. This will change the amount of control oil used by the Pressure side flows through the mentioned gap to the profile groove base. Accordingly, the inventors suggest that the width of the print side existing gap remains unchanged, regardless of the prevailing Operating parameters.

Zahlreiche Ausführungsformen sind möglich. So kann beispielsweise das Dichtelement mit entsprechend gestalteten Nuten versehen werden. Numerous embodiments are possible. For example, that Sealing element can be provided with appropriately designed grooves.

Die Erfindung ist anhand der Zeichnung näher erläutert. Darin ist im einzelnen folgendes dargestellt:

Fig. 1
zeigt eine sichellose Innenzahnradpumpe in einem Axialschnitt.
Fig. 2
zeigt die Innenzahnradpumpe gemäß Fig. 1 in einer ersten Ausführungsform.
The invention is explained in more detail with reference to the drawing. The following is shown in detail:
Fig. 1
shows a crescentless internal gear pump in an axial section.
Fig. 2
shows the internal gear pump according to FIG. 1 in a first embodiment.

Die in Fig. 1 gezeigte Innenzahnradpumpe ist eine sichellose, kopfdichtende und spielbehaftete. Sie umfaßt als wesentliche Elemente ein Hohlrad 1, ein Ritzel 2 sowie ein Gehäuse 3. Das Hohlrad 1 ist mit Bohrungen 1.1 versehen. Diese stellen eine leitende Verbindung zwischen der Umgebung des Hohlrades 1 einerseits und dem Zwischenraum zwischen Hohlrad 1 und Ritzel 2 andererseits her. In die Zähne des Hohlrades sind jeweils Dichtelemente 4 eingesetzt.The internal gear pump shown in Fig. 1 is a sickle-less, head-sealing and playful. It comprises a ring gear 1, as essential elements Pinion 2 and a housing 3. The ring gear 1 is provided with holes 1.1. These provide a conductive connection between the environment of the Ring gear 1 on the one hand and the space between ring gear 1 and pinion 2 on the other hand. Sealing elements 4 are in each case in the teeth of the ring gear used.

Ritzel 2 ist auf einer Ritzelwelle 2.1 aufgekeilt, die in Richtung des Pfeiles X umläuft.Pinion 2 is wedged on a pinion shaft 2.1, which in the direction of arrow X circulates.

Das Gehäuse 3 weist einen Sauganschluß 3.1 und einen Druckanschluß 3.2 auf.The housing 3 has a suction port 3.1 and a pressure port 3.2 on.

Die Zähne 1.3 des Hohlrades und die Zähne 2.2 des Ritzels haben eine gewisse axiale Breite. Hohlrad 1 und Ritzel 2 sind exzentrisch zueinander gelagert. Außerdem ist die Zahl der Zähne 2.2 des Ritzels 2 um eins kleiner als die Zahl der Zähne 1.3 des Hohlrades 1.The teeth 1.3 of the ring gear and the teeth 2.2 of the pinion have one certain axial width. Ring gear 1 and pinion 2 are eccentric to each other stored. In addition, the number of teeth 2.2 of the pinion 2 is one less than the number of teeth 1.3 of the ring gear 1.

Aus Fig. 2 erkennt man im einzelnen folgendes: Jeder Zahn 1.3 des Hohlrades 1 weist eine Profilnut 1.4 auf. In jede Profilnut 1.4 ist ein Dichtelement 4 eingesetzt. Dieses ist auf einem Teil seines Querschnittes schwalbenschwanzförmig gestaltet. Jedes Dichtelement 4 weist einen durchgehenden Kanal 4.1 auf. Dieser stellt eine leitende Verbindung zwischen dem Innenraum oder Profilgrund 1.5 und der Dichtfläche 4.2 des Dichtelementes 4 her.The following can be seen in detail from FIG. 2: Each tooth 1.3 of the Ring gear 1 has a profile groove 1.4. In each profile groove 1.4 is a Sealing element 4 used. This is on part of its cross section dovetail-shaped. Each sealing element 4 has one through channel 4.1 on. This provides a conductive connection between the interior or profile base 1.5 and the sealing surface 4.2 of the Sealing element 4 ago.

Wie man aus dem Doppelpfeil Y erkennt, vermag das Dichtelement 4 während des Laufs der Innenzahnradpumpe eine Radialbewegung auszuführen. Die übrigen Pfeile, die am mittleren Dichtelement gezeigt sind, stellen den Verlauf des Steuerölstromes dar. Wie man daraus erkennt, tritt der Steuerölstrom zunächst von der Druckseite her kommend in einen Spalt 5 ein, der zwischen der Außenfläche des Dichtelementes 4 und der Innenfläche der Profilnut 1.4 gebildet ist. Im schwalbenschwanzförmigen Teil des Dichtelementes ist eine Nut 6 in das Dichtelement eingearbeitet. Im mittleren Teil des Dichtelementes 4 ist eine durchgehende Nut 7 vorgesehen. Die Nut 6 ist derart gestaltet und angeordnet, daß der Steuerölstrom ab der durchgehenden Nut 7 bis zum Nutgrund 1.5 nicht gedrosselt wird. Die Weite des gesamten Kanales ist auch bei einer Radialverschiebung des Dichtelementes 4 stets ein und dieselbe. Der erste Abschnitt dieses Strömungskanales, nämlich der Spalt 5, ist parallel zur Anlagefläche 8 und somit in seiner Spalthöhe unabhängig von radialen Bewegungen Y.As can be seen from the double arrow Y, the sealing element 4 can radial movement while the internal gear pump is running perform. The other arrows shown on the middle sealing element represent the course of the control oil flow. As you can see from this, the Control oil flow initially coming from the pressure side into a gap 5, the between the outer surface of the sealing element 4 and the inner surface of the Profile groove 1.4 is formed. In the dovetail part of the Sealing element is a groove 6 machined into the sealing element. In the middle Part of the sealing element 4, a continuous groove 7 is provided. The groove 6 is designed and arranged so that the control oil flow from through groove 7 to the groove base 1.5 is not throttled. The wide of the entire channel is also at a radial displacement of the Sealing element 4 always one and the same. The first section of this Flow channel, namely the gap 5, is parallel to the contact surface 8 and thus its gap height is independent of radial movements Y.

Claims (2)

  1. An internal gear pump free from inner crescent space;
    1.1 with an internal geared wheel (1);
    1.2 with a pinion (2) combing with the internal geared wheel (1);
    1.3 with the pinion (2) and the internal geared wheel (1) being rotatably held in a housing comprising a suction connection (3.1) and a pressure connection (3.2);
    1.4 with the internal geared wheel (1) comprising two breakthroughs (1.1) which each produce a conductive connection between the base of the tooth and the jacket surface of the internal geared wheel (1);
    1.5 with a profiled groove (1.4) being provided in the tips of the teeth of the internal geared wheel (1) or the pinion (2), in which groove there is inserted one sealing element (4) each which can slide on the opposite tip of the tooth of the pinion (2) or the internal geared wheel (1);
    1.6 with the profiled groove (1.4) being free of connections when seen in a sectional view perpendicular to the axis;
    1.7 with the sealing element (4) being provided with a conduit (4.1) which produces a conductive connection for a control oil flow between the base (1.5) of the profiled groove and the sealing surface (4.2) of the sealing element;
    1.8 with the conduit (4.1) being enclosed by the flesh of the sealing element (4) when seen in the circumferential direction of the pinion (2);
    1.9 with the sealing element (4) being displaceable in a limited fashion in the profiled groove (1.4) in the radial direction by forming a gap (5) formed between the outside surface of the sealing element (4) and the inside surface of the profiled groove (1.4), so that the base (1.5) of the profiled groove is in conductive connection with the pressure side;
    characterized by the following features:
    1.10 the sealing element (4) and/or profiled groove (1.4) are arranged in such a way that the width of the gap (5) defining the flow rate of control oil flow is substantially of the same size at any random radial position of the sealing element (4).
  2. An internal gear pump as claimed in claim 1, characterized in that the sealing element (4), when seen in an axial sectional view, comprises a dovetail-like part and that in the region of said dovetail-like part at least one groove is incorporated either in the outer surface of the sealing element (4) or in the inner surface of the profiled groove (1.4).
EP98120951A 1998-02-03 1998-11-05 Internal gear pump free from inner crescent space Expired - Lifetime EP0933530B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19804134A DE19804134A1 (en) 1998-02-03 1998-02-03 Sickle-free internal gear pump
DE19804134 1998-02-03

Publications (2)

Publication Number Publication Date
EP0933530A1 EP0933530A1 (en) 1999-08-04
EP0933530B1 true EP0933530B1 (en) 2004-03-03

Family

ID=7856473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98120951A Expired - Lifetime EP0933530B1 (en) 1998-02-03 1998-11-05 Internal gear pump free from inner crescent space

Country Status (8)

Country Link
US (1) US6095782A (en)
EP (1) EP0933530B1 (en)
JP (1) JPH11270466A (en)
KR (1) KR19990071433A (en)
AT (1) ATE261064T1 (en)
DE (2) DE19804134A1 (en)
DK (1) DK0933530T3 (en)
ES (1) ES2221969T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6273695B1 (en) * 1999-03-26 2001-08-14 Voith Turbo Gmbh & Co. Kg Sickleless internal gear wheel pump with sealing elements inserted into the tooth tips

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790394A (en) * 1952-09-02 1957-04-30 Gulf Research Development Co Internal-external gear pump with self-sealing tooth tips
GB1155084A (en) * 1965-08-21 1969-06-18 Concentric Engineering Ltd Improvements relating to Rotary Fluid Pumps and Motors
DE2528990A1 (en) * 1975-06-28 1977-01-27 Wolfgang Von Dr Ing Preen Sepn. of oil-in-water emulsions - using ultrafiltration with membrane not permeable by oil with physical or chemical pretreatment
DE4140293C2 (en) * 1991-12-06 1994-06-01 Voith Gmbh J M Sickle-free internal gear pump with sealing elements inserted in the tooth heads
EP0563661A1 (en) * 1992-03-19 1993-10-06 J.M. Voith GmbH Internal gear pump with radially movable sealing elements for radial compensation
ATE139305T1 (en) * 1993-01-18 1996-06-15 Voith Gmbh J M SHAFTLESS INTERNAL GEAR PUMP WITH SEALING ELEMENTS INSERTED INTO THE GEAR HEADS
ATE176301T1 (en) * 1993-12-17 1999-02-15 J M Voith Gmbh & Co Beteiligun SICKLELESS INTERNAL GEAR PUMP
DE19712169C1 (en) * 1997-03-22 1998-03-12 Voith Turbo Kg Internal-gear pump without crescent components

Also Published As

Publication number Publication date
EP0933530A1 (en) 1999-08-04
DE19804134A1 (en) 1999-08-12
KR19990071433A (en) 1999-09-27
US6095782A (en) 2000-08-01
DE59810908D1 (en) 2004-04-08
DK0933530T3 (en) 2004-07-05
ATE261064T1 (en) 2004-03-15
JPH11270466A (en) 1999-10-05
ES2221969T3 (en) 2005-01-16

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