EP0864047A1 - Dispositif d'etancheite axial - Google Patents

Dispositif d'etancheite axial

Info

Publication number
EP0864047A1
EP0864047A1 EP96938986A EP96938986A EP0864047A1 EP 0864047 A1 EP0864047 A1 EP 0864047A1 EP 96938986 A EP96938986 A EP 96938986A EP 96938986 A EP96938986 A EP 96938986A EP 0864047 A1 EP0864047 A1 EP 0864047A1
Authority
EP
European Patent Office
Prior art keywords
sealing
side wall
rotatable shaft
track
pump
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.)
Withdrawn
Application number
EP96938986A
Other languages
German (de)
English (en)
Inventor
Joern Holger Klausen
Tage Joergensen
Ingvard Mosby Madsen
Peter Froeslev
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.)
Danfoss AS
Original Assignee
Danfoss AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Danfoss AS filed Critical Danfoss AS
Publication of EP0864047A1 publication Critical patent/EP0864047A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings

Definitions

  • the present invention concerns an axial sealing in a pump or a motor, comprising a housing (1) with side walls (5, 6) forming the limits in axial direction of a chamber (7), where at least one of said side walls (5, 6) has an inlet (12) and optionally an outlet (13), said pump or motor also including a rotatable shaft (2) extending through at least one shaft hole (11) in one of the side walls (5) , a rotating element (9) arranged between the side walls (5, 6) and provided with a first lateral face (9' ) opposite to one side wall (5) , and a second lateral face (9'' ) opposite to the other side wall (6), said rotating element (9) being rotatable by the rotatable shaft (2), and at least one sealing element (19) arranged between and bearing against one inner side of a side wall (5, 6) and a lateral face of the rotating element.
  • the pump comprises a pump housing with an orbiting tooth wheel driven by a shaft.
  • a sealing element is arranged between a lateral face of the tooth wheel and a side wall of the pump chamber.
  • the sealing element is meant for maintaining a given pressure on the tooth wheel m the direction of the opposite side wall, in a way that the risk of leakage between the first lateral face of the orbiting tooth wheel and the first side wall of the pump chamber is reduced.
  • the pump with sealing involves the disadvantage that the sealing between the first lateral face and the first side wall is very much depending on the surfaces being closely adjacent to each other. As long as the speed of the shaft and thus of the tooth wheel is limited, and as long as the medium to be pumped has a sufficiently high viscosity, the risk of a leak is small. However, if the speed is increased, and/or the medium to be pumped has a low viscosity, the risk of a leak is increasing. An occurring leak will also involve the risk of a damage of the shaft and possible bearings of the shaft, for instance through corrosion, by the medium to be pumped. Also, the sealing is arranged between metallic surfaces, which demands that the medium to be pumped has lubricating qualities .
  • the purpose of the present invention is thus to produce a sealing providing a higher degree of tightness than a surface sealing between the lateral face of a rotating element such as a rotating tooth wheel and the side wall of the pumping chamber, in order to prevent leaks from the pump chamber to the rotatable shaft and thus to the environment.
  • sealing element extends around the rotatable shaft and that m the radial direction the sealing element is arranged between the rotatable shaft and the inlet, optionally the outlet .
  • a sealing with these characteristics is efficient for the sealing between a pump chamber and a rotatable shaft, where it is required that in the case of a leak, the pumped medium does not reach the rotatable shaft, any bearings for the rotatable shaft or the surroundings.
  • This sealing is generally suited for sealing at rotatable shafts and especially well suited for pumps with a high speed rotatable shaft. Tolerances between the lateral faces of the rotating element and the side walls of the pump housing can be maintained independently of whether the pumps or motors work with low or high speeds.
  • the sealing according to the invention is also well suited. Leaks caused by insufficient bearing between a lateral face of a rotating element and a side wall of the pump chamber are avoided, and the risk of capillary tube effect between such surfaces is eliminated. Thus, during standstill, the sealing prevents that pump medium is led to the rotatable shaft .
  • the sealing according to the invention is characterised in that at least one of the first, or the second lateral face of the rotating element, respectively, is provided with a track extending around the rotatable shaft, and that one sealing element is arranged in the track and bearing against the opposite side wall.
  • the sealing according to the invention and according to the preferred embodiment mentioned above is characterised m that the sealing element consists of a wear element and an adjacent elastic element, that the elastic ring has a smallest diameter being smaller than or equal to the smallest diameter of the track, that the elastic ring has a largest diameter being smaller than the largest diameter of the track, that the elastic ring is arranged in a bottom of the track, and that the massive ring is arranged between the elastic ring and an opening of the track.
  • Wear element and elastic element can be assembled in one unit.
  • a sealing element consisting of a combination of a wear- resisting element and an elastic element has turned out to be useful to obtain sufficient sealing m the type of pumps and motors, in which the sealing according to the invention is primarily used.
  • the wear-resisting sealing element can also be covered with or made of a material reducing the friction between the ring and the side wall, such as polytetraflourethen, sold under the trademark TEFLON®, alternatively PEEK.
  • the smallest diameter of the elastic element is smaller than or equal to the smallest diameter of the track, to secure that the elastic element, when placed m the track, is bearing against the inner diameter of the track, and not against the outer diameter of the track.
  • An alternative axial sealing according to the invention is characterised in that the sealing is arranged between a first surface and a second surface meant for making a relative movement, that the sealing between the surfaces is placed in a recess in the first or the second surface, that the sealing is formed of a flexible element bearing against the first surface and a stiff element bearing against the second surface, and that the flexible element exerts a pressure force against the stiff element.
  • fig. 1 is a section through a pump with a first embodiment of an axial sealing according to the invention
  • fig. 2 is a section through the pump shown m fig. 1 illustrating an internal tooth wheel and an external tooth wheel forming the pump wheel fig.
  • 3 is a section through part of a pump chamber and a pump wheel in a pump as shown in fig. 1
  • fig. 1 illustrates a pump with an axial sealing according to the invention.
  • the pump comprises a pump housing 1.
  • a rotatable shaft 2 is supported m bearings 3, 4 and extends into the pump housing 1 through a first side wall 5. Together with a second side wall 6, side wall 5 forms the axial limitation of a pump chamber 7.
  • the pump housing 1 comprises a chamber wall 8.
  • the chamber wall 8 forms the bearing ring of an external toothed rim 26, which is also the limitation of the pump chamber 7.
  • a rotating element in the shape of an inner tooth wheel 9 is arranged m the pump chamber 7.
  • the inner tooth wheel 9 is mounted on the rotatable shaft 2 and meant for being driven by the rotatable shaft 2.
  • the pump shown in the figure is a gerotor pump functioning by a medium being pumped by successive meshing between the teeth of the inner tooth wheel 9 and the outer toothed rim 26, respectively (see fig. 2) .
  • the inner tooth wheel will be called the pump wheel.
  • the first side wall is provided with a through-hole 11 for the rotatable shaft.
  • the second side wall is provided with an inlet 12 to the pump chamber 7 and an outlet 13 from the pump chamber 7 for the medium to be pumped.
  • An end cover 14 bears against an outside 15 of the second side wall o and is provided with thread holes 16 for the connection of hoses or pipes (not shown ⁇ to lead the medium to and from the pump.
  • sealing element 17 is arranged in track 18. Between the rotatable shaft 2 and the pump wheel 9 a further sealing element 27 is arranged.
  • the sealing element 27 is arranged in a track 28 in the rotatable shaft.
  • the sealing elements 17 and 27 are sealing rings, preferably 0- rings .
  • the sealing element 19 is the axial sealing according to the invention.
  • the sealing element 19 consists of a massive ring 20 and an elastic ring 21.
  • the sealing element is arranged m a track 22 m the pump wheel 9.
  • the elastic ring 21 is arranged in a bottom 23 (see fig. 3) of the track 22, and the massive ring 20 is arranged between the elastic ring 21 and the first side wall 5 m a way that the massive ring 20 extends outside an opening 24 (see fig. 3) of the track 22 and bears against the first side wall 5.
  • the massive ring 20 is meant for providing the sealing between the ring 20 and the first side wall and for absorbing wear loads during the rotation of pump wheel 9 in the pump chamber 7.
  • the elastic ring is meant for providing sealing between the pump wheel 9 (7? se dansk) and the massive ring and for establishing sufficient bearing power for the bearing of the massive ring 20 against the first side wall 5.
  • the massive ring 20 is preferably made of a material containing coal, coal fibres or graphite, or of a material covered with or made of Teflon® or PEEK, to minimise the friction between the ring 20 and the first side wall 5.
  • the elastic ring 21 is preferably made of rubber.
  • Fig. 2 shows a section through the gerotor pump in fig. 1. The section is made vertically in relation to the section in fig. 1 and runs through the pump chamber 7. The figure shows the rotatable shaft 2, the inner pump wheel 9, the outer tooth rim 26 and the pump chamber 7 between the inner pump wheel 9 and the outer tooth rim 26.
  • the chamber wall 8 and the second side wall 6, the inlet 12, the outlet 13 and the track 22 are also shown.
  • a section shows a magnified part of the pump illustrated m fig. 1.
  • Fig. 3 shows the rotatable shaft 2, the first side wall 5, the second side wall 6 w th inlet 12, the chamber wall 8, the pump chamber 7, the pump wheel 9, the sealing element 17 between the chamber wall 8 and the first side wall 5 or the second side wall 6, respectively, and the sealing element 27 between the rotatable shaft 2 and the pump wheel 9.
  • the axial sealing 19 according to the invention is also shown.
  • the pump wheel 9 has a first lateral face 9' opposite to the first side wall 5 and a second lateral face 9' ' opposite to the second side wall 6.
  • the axial sealing comprises a massive ring 20 and an elastic ring 21.
  • the elastic ring 21 is placed in the bottom 23 of track 22 and has a smallest diameter d 2 ⁇ which is almost equal to the smallest diameter d ? of the track 22, and a largest diameter D ? which is smaller than a largest diameter D 22 of the track 22.
  • the massive ring 20 is placed at the opening 24 of the track 22 and has a smallest diameter d A and a largest diameter D , the sizes of which are between the smallest diameter d z and the largest diameter D,, of the track 22.
  • Fig. 4 shows a second embodiment of the axial sealing according to the invention.
  • the axial sealing comprises a first sealing element 19' between the pump wheel 9 and the first side wall 5 and a second sealing element 19' ' between the pump wheel 9 and the second side wall 6.
  • the sealing elements 19' and 19'' are the same as the sealing element 19 described m fig. 2.
  • Fig. 5 shows a third embodiment of an axial sealing according to the invention.
  • the sealing between the first side wall 5 and the pump wheel 9 is provided by the first sealing element 19' as illustrated in fig. 3, whereas the track 22 is provided in the first side wall 5 in stead of in the pump wheel 9.
  • the groove 22 of the second sealing element 19' ' between the pump wheel 9 and the second side wall 6 is still provided in the pump wheel 9, but m an alternative embodiment, it could be provided m the second side wall 6.
  • the sealing elements 19' and 19'' are the same as the sealing element 19 described in fig. 2. For a description of the sealing elements in fig. 5, see description under fig. 2.
  • Fig. 6 shows a fourth embodiment of an axial sealing according to the invention.
  • the axial sealing is provided partly between the pump wheel 9 and the first side wall 5 or the second side wall 6, respectively, partly between the outer tooth rim 26 and the first side wall 5 or the second side wall 6, respectively.
  • the sealing elements are the same as the sealing element 19 described in fig. 2.
  • Fig. 7 shows a section of the sealing elements illustrated in fig. 2 to fig. 5.
  • the sealing element 19 thus comprises a massive ring 20 and an elastic ring 21.
  • the massive ring has a smallest diameter d 20 and a largest diameter D 20 , the sizes of which are between the smallest diameter d 22 and the largest diameter D 22 , respectively, of the track 22.
  • the elastic ring 21 has a smallest diameter d 2 ⁇ which is almost equal to a smallest diameter d of the track 22, and a largest diameter D 21 which is smaller than the largest diameter O 22 of the track 22 improves the sealing qualities of the elastic ring 21. If the medium to be pumped is led from the pump chamber 7 past the bearing 25 of the pump wheel against the first side wall 5 and into the track 22, this medium, which is under pressure, will exert a pressure on the elastic ring 21 to the inside towards the smallest diameter d_ 2 of the track 22.
  • the pressure exerted on the ring 21 by the medium under pressure will cause a deformation of the elastic ring 21 in a way that the ring 21 is pressed to the inside against the bottom 23 of the track and to the outside against the massive ring 20.
  • This pressure against the bottom 23 of the track 22 or the massive ring 20, respectively increases the sealing effect of the elastic ring 21 and also the sealing of the bearing of the massive ring 20 against the first side wall 5.
  • the pressure exerted by the medium in the track 22 will also press the massive ring further out against the first side wall 5.
  • the elastic ring 21 provides sufficient sealing during standstill of the pump, whereas the pressure of the medium provides improved sealing during operation.
  • Fig. 8 shows a different embodiment of the massive ring 20 being part of the axial sealing according to the invention.
  • the massive ring 20 has the shape of an L. This gives an easier mounting of the elastic ring, as a correct placing of the elastic ring 21 in relation to the massive ring 20 is ensured.
  • Fig. 9 shows yet another embodiment of the massive ring 20 being part of the axial sealing according to the invention.
  • the massive ring has the shape of a U.
  • an easy mounting of the elastic ring 21 is provided, and besides it is possible to pre-mount the elastic ring 21 and the massive ring 20 m a way that these form only one unit.
  • the axial sealing according to the invention is described with reference to one specific embodiment of a pump and one specific embodiment of a sealing element comprising a massive ring and an elastic ring.
  • a sealing element comprising a massive ring and an elastic ring.
  • Other embodiments of the axial sealing can also be produced.

Landscapes

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

Abstract

L'invention concerne un dispositif d'étanchéité axial pour des pompes ou des moteurs, dans lequel un milieu est pompé dans une chambre (7) délimitée par une première paroi latérale (5) et une seconde paroi latérale (6). Le milieu est pompé par un élément rotatif (9), de préférence une roue dentée entraînée par un arbre rotatif (2). Compte tenu de ce que l'on pompe de nouveaux milieux ayant une viscosité moindre que les milieux pompés antérieurement, et par suite de l'effet néfaste et corrosif de ces milieux pompés, entre autres sur l'arbre rotatif, il est nécessaire de prévoir de nouveaux dispositifs d'étanchéité. Le dispositif d'étanchéité axial selon l'invention comprend un élément d'étanchéité (19) entourant l'arbre rotatif (2). Dans la direction radiale, l'élément d'étanchéité (19) est disposé entre l'arbre rotatif (2) et une entrée (12) et/ou une sortie (13). Le joint d'étanchéité axial selon l'invention est capable de maintenir des pressions suffisantes dans la chambre, à des vitesses élevées de l'élément de rotation auxquelles les pompes et les moteurs destinés aux nouveaux milieux à pomper travaillent. Le dispositif d'étanchéité axial selon l'invention est également capable de maintenir l'étanchéité en cas de fuite du milieu pompé entre les parois latérales (5, 6) et l'élément rotatif (9) et il est également capable de maintenir l'étanchéité durant l'arrêt de la pompe.
EP96938986A 1995-11-27 1996-11-26 Dispositif d'etancheite axial Withdrawn EP0864047A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK133995A DK172177B1 (da) 1995-11-27 1995-11-27 Aksial tætning
DK133995 1995-11-27
PCT/DK1996/000493 WO1997020145A1 (fr) 1995-11-27 1996-11-26 Dispositif d'etancheite axial

Publications (1)

Publication Number Publication Date
EP0864047A1 true EP0864047A1 (fr) 1998-09-16

Family

ID=8103766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96938986A Withdrawn EP0864047A1 (fr) 1995-11-27 1996-11-26 Dispositif d'etancheite axial

Country Status (4)

Country Link
EP (1) EP0864047A1 (fr)
AU (1) AU7621796A (fr)
DK (1) DK172177B1 (fr)
WO (1) WO1997020145A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005004657A1 (de) * 2005-02-02 2006-08-03 Eckerle Industrie-Elektronik Gmbh Innenzahnradmaschine
DE102012210938A1 (de) * 2012-06-27 2014-05-15 Robert Bosch Gmbh Innenzahnradpumpe
DE102012213771A1 (de) * 2012-08-03 2014-02-06 Robert Bosch Gmbh Innenzahnradpumpe
DE102015105933B4 (de) * 2015-04-17 2018-04-26 Schwäbische Hüttenwerke Automotive GmbH Pumpe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2606172C2 (de) * 1976-02-17 1983-12-22 Danfoss A/S, 6430 Nordborg Rotationskolbenmaschine für Flüssigkeiten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9720145A1 *

Also Published As

Publication number Publication date
AU7621796A (en) 1997-06-19
WO1997020145A1 (fr) 1997-06-05
DK172177B1 (da) 1997-12-15
DK133995A (da) 1997-05-28

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