US10385977B2 - Shaft slide ring seal arrangement - Google Patents

Shaft slide ring seal arrangement Download PDF

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Publication number
US10385977B2
US10385977B2 US15/759,058 US201615759058A US10385977B2 US 10385977 B2 US10385977 B2 US 10385977B2 US 201615759058 A US201615759058 A US 201615759058A US 10385977 B2 US10385977 B2 US 10385977B2
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United States
Prior art keywords
shaft
slide ring
arrangement
ring seal
slide
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Active
Application number
US15/759,058
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English (en)
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US20190040958A1 (en
Inventor
Johann Kreidl
Hisham Kamal
Mikael Tekneyan
Philipp Nuebl
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.)
Netzsch Pumpen and Systeme GmbH
Original Assignee
Netzsch Pumpen and Systeme GmbH
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Assigned to NETZSCH PUMPEN & SYSTEME GMBH reassignment NETZSCH PUMPEN & SYSTEME GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAMAL, HISHAM, KREIDL, JOHANN, NUEBL, Philipp, TEKNEYAN, MIKAEL
Publication of US20190040958A1 publication Critical patent/US20190040958A1/en
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Classifications

    • 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
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3464—Mounting of the seal
    • F16J15/3472—Means for centering or aligning the contacting faces
    • 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
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • 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
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/005—Axial sealings for working fluid

Definitions

  • the invention relates to a shaft slide ring seal arrangement and a drivetrain section and to an eccentric screw pump with a shaft slide ring seal arrangement.
  • a shaft slide ring seal arrangement is known from US 2006/0061041 A1.
  • the latter makes provision such that a shaft sleeve is pushed onto a shaft and is connected at one end of the shaft sleeve to the shaft non-rotatably by means of screws, which are passed radially through a stop ring additionally fitted on the shaft sleeve.
  • a pushed-on shaft slide ring Located at the other end of the shaft sleeve is a pushed-on shaft slide ring, which is connected non-rotatably to the shaft sleeve and, by means of a spring ring element, is pretensioned in the direction of the stop ring against a slide ring arrangement radially spaced apart from the shaft sleeve.
  • positioning hooks are provided which are fixed to the stop ring by the radial screws and engage into a corresponding circumferential groove in the slide ring arrangement. These positioning hooks are used solely during transport or during installation or removal of the shaft slide ring seal arrangement in a drivetrain. Once installed, a spacing between the fixed slide ring arrangement and the stop ring is maintained, in that the slide ring arrangement is screwed to a fixed housing, so that the positioning hooks can be removed.
  • the problem of the invention is to make available a shaft slide ring seal arrangement which reliably prevents jamming and/or wedging of the slide ring seal.
  • a shaft slide ring seal arrangement comprises a shaft, which has a first end and a second end, and a slide ring seal, which comprises a shaft slide ring connected non-rotatably to the shaft, the axial displaceability whereof is limited at least in the direction of the first end of the shaft by means of a limiting element, and a slide ring arrangement arranged at a radial distance from the shaft, which slide ring arrangement lies, at a side of the shaft slide ring pointing towards the second end of the shaft, axially adjacent thereto, and also a retaining ring supported on the shaft, the axial displaceability whereof is limited at least in the direction of the second end of the shaft and which centers the slide ring arrangement, on its side facing away from the shaft slide ring, with respect to the shaft.
  • the slide ring seal can remain on the shaft when the shaft is installed in and removed from a drivetrain.
  • the slide ring seal does not need to be dismantled in order to be able to remove the shaft from a device.
  • the retaining ring thus keeps the slide ring arrangement centered with respect to the shaft in every operational state of the shaft and thus automatically prevents jamming or wedging of the slide ring arrangement.
  • the retaining ring advantageously has a face pointing towards the slide ring arrangement and descending towards the shaft longitudinal axis. In this way, the centering of the slide ring arrangement is facilitated when the retaining ring is fitted and, moreover, centering of an assembled shaft slide ring seal arrangement thus automatically takes place.
  • the face used for the centering is an annular face tapering conically.
  • the slide ring arrangement can comprise one element, but it is particularly advantageous for the slide ring arrangement to comprise a slide ring and a slide ring holder, wherein the slide ring holder is connecting non-rotatably to the slide ring and the shaft slide ring is mounted axially spring-loaded with respect to the limiting element.
  • Standardized slide rings can thus be used, which can be adapted to different shaft slide ring seal arrangements by means of application-specific slide ring holders.
  • the slide ring seal is advantageous for the slide ring seal to be displaceable relative to the limiting element by release of the retaining ring, in order to be able to increase the pretensioning further.
  • a gap between the retaining ring and the slide ring arrangement can thus be created in the installed state of the shaft slide ring seal arrangement, said gap preventing friction between the rotating retaining ring and the fixed slide ring arrangement, and the required operational pretensioning in the slide ring seal nonetheless being achieved.
  • a shaft slide ring seal arrangement is also advantageous, wherein the slide ring arrangement is held in its position centered on the retaining ring by means of a retaining element.
  • This retaining element is used in a difficult installation and removal situation and/or with very heavy components and, when threading the shaft slide ring seal arrangement into a device, offers additional safeguarding against slipping or wedging of the slide ring seal. These retaining elements are thus used only for the installation or removal and are removed again for the operation.
  • the invention also related to a drivetrain section with a drive shaft, a shaft ring seal arrangement following the latter as described above and a receiving device surrounding the shaft slide ring seal arrangement in a fixed manner, wherein the receiving device is concentric with respect to the drive shaft and receives the slide ring arrangement non-rotatably, and wherein the receiving device is arranged at a fixed axial distance from the drive shaft.
  • a drivetrain section facilitates the introduction and securing of the shaft slide ring seal arrangement, wherein at the same time the slide ring arrangement is fixed by the receiving device, so that a rotation of the shaft brings about a relative movement of the shaft slide ring with respect to the slide ring arrangement and the slide ring.
  • the receiving device and the drive shaft limit an axial displacement of the slide ring seal away from the limiting element. Slipping of the shaft slide ring seal arrangement through the receiving device can thus be prevented. Moreover, with a retaining ring connected fixedly to the shaft and which rotates with the shaft, a gap can thus be created between the retaining ring and the slide ring arrangement, said gap preventing friction between the rotating retaining ring and the fixed slide ring arrangement, and the required operational pretensioning between the shaft slide ring and the slide ring can nonetheless be achieved.
  • the above shaft slide ring seal arrangement or the drivetrain section are advantageously used in an eccentric screw pump.
  • a rapid and uncomplicated installation and removal is particularly important, so that for this purpose the shaft slide ring seal arrangement can be dismantled as a unit comprising the shaft and the slide ring seal and can, if desired, only be split up into its individual parts following dismantling.
  • FIG. 1 shows an example of embodiment of a shaft slide ring seal arrangement according to the invention in a receiving device
  • FIG. 2 shows section A-A from FIG. 1 with a symbolically represented drive shaft
  • FIG. 3 shows a perspective exploded view of the shaft slide ring seal arrangement with the receiving device according to FIGS. 1 and 2 .
  • FIG. 1 shows a shaft slide ring seal arrangement according to the invention, the individual parts whereof can best be seen in section A-A in FIG. 2 and in the perspective exploded view end FIG. 3 .
  • the shaft ring seal arrangement comprises a shaft 10 , which at its first end 12 comprises an articulated socket and at its second end 14 comprises a socket for a driveshaft 15 . Furthermore, the shaft slide ring seal arrangement comprises, viewed from left to right in FIG. 2 , a shaft slide ring 18 connecting non-rotatably to shaft 10 and lying adjacent to a limiting element 16 a constituted as a shaft shoulder 16 , a slide ring 20 pushed onto the shaft at a radial distance, a slide ring holder 22 holding slide ring 20 and pushed on at a greater radial distance from the shaft 10 , as well as a retaining ring 28 connected to shaft 10 by means of shaft groove 24 via pins 26 , which retaining ring comprises an annular face 32 inclined towards shaft longitudinal axis 30 , with which annular face it lies against a complementary face of slide ring holder 22 .
  • Slide ring 20 and slide ring holder 22 form a slide ring arrangement 20 , 22 . Furthermore, shaft slide ring 18 and slide ring arrangement 20 , 22 form a slide ring seal 18 , 20 , 22 .
  • a spring element also belonging to slide ring arrangement 20 , 22 , said spring element being in the form of sinusoidal springs fitted onto the shaft or in the form of helical springs arranged running around the shaft, which spring element lies between slide ring 20 and slide ring holder 22 and supports the latter axially spring-loaded with respect to one another.
  • Entire slide ring seal 18 , 20 , 22 is thus enclosed between a shaft shoulder 16 and retaining ring 28 and held on shaft 10 .
  • the position of retaining ring 28 on shaft 10 is selected by means of an axial spacing of a shaft groove 24 from shaft shoulder 16 , in such a way that slide ring seal 18 , 20 , 22 acquires a pretension and slide ring holder 22 remains in contact with retaining ring 28 and centered with respect to shaft 10 .
  • retaining elements 34 constituted as retaining clamps 34 are provided in the example of embodiment, said retaining elements being fastened by means of screws 36 to retaining ring 28 , in such a way that they engage in a complementary hook-shaped end of slide ring holder 22 in the form of a retaining element groove 38 , in order to secure slide ring holder 22 to retaining ring 28 .
  • These retaining clamps 34 are required in particular in the presence of especially difficult installation and removal conditions and in the case of particularly heavy and large components and even then are provided only for the installation and removal of the shaft slide ring seal arrangement.
  • shaft slide ring 18 is first pushed onto shaft 10 until it lies against shaft shoulder 16 ; slide ring arrangement 20 , 22 is then pushed onto shaft 10 and brought into contact with shaft slide ring 18 ; retaining ring 28 is then pushed on and its inclined face 32 is pressed against the face of slide ring holder 22 inclined in a complementary manner, in order to push retaining ring 28 over shaft groove 24 , after which it is fixed axially on shaft 10 by means of pins 26 engaging in shaft groove 24 .
  • Receiving device 40 here is a ring with a stepped inner periphery that projects out of a non-rotatable housing, as a result of which a receiving shoulder 42 is formed, which defines the end position of the shaft slide ring seal arrangement and prevents a further axial displacement of the shaft slide ring seal arrangement.
  • pins 44 in receiving device 40 or alternatively projections on receiving device 40 are provided, which project radially inwards and engage in corresponding circumferential axial grooves 46 on the outer side of slide ring holder 22 . Consequently, the present non-rotatable securing is a form-fit contact between slide ring holder 22 and receiving device 40 .
  • An O-ring seal 48 is provided in an outer O-ring groove 50 of slide ring holder 22 for the seal between slide ring holder 22 and receiving device 40 .
  • shaft 10 In order to connect shaft 10 to a drive shaft 15 ( FIG. 2 ), shaft 10 , proceeding from the state represented in FIG. 2 , must be pressed against receiving shoulder 42 or against pins 44 by means of slide ring arrangement 18 , 20 , 22 , so that a gap arises between retaining ring 28 and slide ring holder 22 in the assembled state (not shown) on account of the spring-loaded support of slide ring 20 .
  • an initial offset Y between radial openings 11 in shaft 10 and a radial opening 17 in drive shaft 15 is thus overcome, so that openings 11 , 17 are aligned with one another.
  • This initial offset Y is also represented in FIG.
  • Gap X and offset Y are subject to the following relationship: X>Y.
  • Drive shaft 15 and its radial opening 17 are represented with a dashed line in FIG. 2 .
  • Openings 11 of shaft 10 have the same diameter as opening 17 in drive shaft 15 .
  • the unbroken parallel lines extending between openings 11 show the width of an annular groove, which arises at the inner circumferential surface of second end 14 of the shaft 10 on account of a burr-removing process.
US15/759,058 2015-09-09 2016-09-01 Shaft slide ring seal arrangement Active US10385977B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102015011808 2015-09-09
DE102015011808.0A DE102015011808B4 (de) 2015-09-09 2015-09-09 Antriebsstrangabschnitt, insbesondere für eine Exzenterschneckenpumpe
DE102015011808.0 2015-09-09
PCT/DE2016/000336 WO2017041775A1 (de) 2015-09-09 2016-09-01 Wellengleitringdichtungsanordnung

Publications (2)

Publication Number Publication Date
US20190040958A1 US20190040958A1 (en) 2019-02-07
US10385977B2 true US10385977B2 (en) 2019-08-20

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ID=57130118

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/759,058 Active US10385977B2 (en) 2015-09-09 2016-09-01 Shaft slide ring seal arrangement

Country Status (7)

Country Link
US (1) US10385977B2 (de)
EP (1) EP3347629B1 (de)
CN (1) CN108027068A (de)
BR (1) BR112018004442B1 (de)
DE (1) DE102015011808B4 (de)
WO (1) WO2017041775A1 (de)
ZA (1) ZA201801513B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018102640A1 (de) * 2018-02-06 2019-08-08 Seepex Gmbh Exzenterschneckenpumpe
DE102018129054B4 (de) * 2018-11-19 2023-08-31 FRISTAM Pumpen Schaumburg GmbH Rotierende Pumpe
CN113261820B (zh) * 2021-05-27 2022-08-02 红河学院 一种具有改变灯光效果的插画展示板

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US3031199A (en) * 1958-08-19 1962-04-24 City Nat Bank And Trust Compan Rotary seal
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US3655206A (en) * 1969-06-27 1972-04-11 Durametallic Corp Multilayer graphite seal ring
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US3250539A (en) * 1963-03-25 1966-05-10 Crane Packing Co Seal with spring holder
US3388913A (en) * 1965-06-03 1968-06-18 Borg Warner Mechanical seal
US3393916A (en) * 1965-12-27 1968-07-23 Crawford S. Askew Shaft seal
US3655206A (en) * 1969-06-27 1972-04-11 Durametallic Corp Multilayer graphite seal ring
US4095807A (en) * 1975-01-03 1978-06-20 Goetzewerke Friedrich Goetze Ag Slide ring seal
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US20060061041A1 (en) * 2004-09-22 2006-03-23 Scenic Precise Element Inc. Shaft-sealing device having an inner modular structure for combining with a rotary machine
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Title
International Search Report & Written Opinion of the International Searching Authority Application No. PCT/DE2016/000336 Completed Date: Jan. 26, 2017; dated Feb. 8, 2017 11 pages.

Also Published As

Publication number Publication date
EP3347629B1 (de) 2019-02-13
ZA201801513B (en) 2019-01-30
CN108027068A (zh) 2018-05-11
EP3347629A1 (de) 2018-07-18
BR112018004442B1 (pt) 2021-01-19
WO2017041775A1 (de) 2017-03-16
US20190040958A1 (en) 2019-02-07
DE102015011808B4 (de) 2017-05-11
DE102015011808A1 (de) 2017-03-09
BR112018004442A2 (pt) 2018-09-25
DE102015011808A8 (de) 2017-04-27

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