WO2023083775A1 - Ensemble garniture étanche à anneau glissant et pompe centrifuge pourvue d'un tel ensemble garniture étanche à anneau glissant - Google Patents

Ensemble garniture étanche à anneau glissant et pompe centrifuge pourvue d'un tel ensemble garniture étanche à anneau glissant Download PDF

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Publication number
WO2023083775A1
WO2023083775A1 PCT/EP2022/081056 EP2022081056W WO2023083775A1 WO 2023083775 A1 WO2023083775 A1 WO 2023083775A1 EP 2022081056 W EP2022081056 W EP 2022081056W WO 2023083775 A1 WO2023083775 A1 WO 2023083775A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
channel
mechanical seal
housing
seal housing
Prior art date
Application number
PCT/EP2022/081056
Other languages
German (de)
English (en)
Inventor
Markus Bernet
Marco Brendel
Original Assignee
KSB SE & Co. KGaA
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 KSB SE & Co. KGaA filed Critical KSB SE & Co. KGaA
Publication of WO2023083775A1 publication Critical patent/WO2023083775A1/fr

Links

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
    • F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]

Definitions

  • the present invention relates to a mechanical seal arrangement for a shaft that can be driven in rotation about an axis of rotation, with a seal housing having a wall, a seal chamber defined by the seal housing, a first seal ring arranged in the seal chamber, a second seal ring cooperating with the first seal ring, and a channel formed in the seal housing for supply a flushing medium into the sealing chamber.
  • the invention also relates to a centrifugal pump with such a mechanical seal arrangement and a manufacturing method for such a mechanical seal arrangement.
  • the mechanical seal assembly includes a with a rotating component such.
  • a rotating component such as a rotatably drivable shaft, rotating first seal ring and a non-rotating second seal ring, also called mating ring, which is connected to a stationary component, such as a seal housing.
  • the pair of mechanical seals is housed in the seal housing.
  • One of the slip rings is usually arranged so that it can move axially.
  • the axially movable slide ring is urged by a prestressing element, for example a spring element, in the direction of the axially fixed slide ring.
  • the closing force that brings the sliding rings to the sealing interaction is usually by the on axially movable slide ring acting biasing element and a hydraulic load generated by the fluid against which is sealed.
  • the rotating gas ring ensures that the liquid film between the sliding surfaces, which consist of the material silicon carbide/silicon carbide or silicon carbide/carbon, breaks off and then thermally overloads the sliding surfaces rubbing against each other due to the increased friction.
  • the liquid film between the sliding surfaces is essential for the functional principle of this dynamic shaft seal, as it lubricates and cools the sliding surfaces.
  • the object of the present invention is to create a cost-effective and reliable mechanical seal arrangement with a long service life.
  • the channel in the seal housing is divided into a plurality of channel extensions towards the sealing chamber.
  • one of the channel extensions has a center line that ends offset counterclockwise to an imaginary plane extending perpendicularly through the axis of rotation at an angle of essentially 12° to 18°, in particular 15°, on the inner lateral surface of the seal housing.
  • the medium flowing out of the duct extension into the sealing chamber enters the sealing chamber at an angle of essentially 49° to 54°, in particular 51.5°, with respect to the imaginary plane extending vertically through the axis of rotation.
  • the flushing medium thus flows into the sealing chamber counter to the direction of rotation of the shaft and the gas ring rotating with the shaft and creates a strong turbulence that breaks up the gas ring.
  • one of the channel extensions has a center line that ends offset clockwise at an angle of essentially 12° to 18°, in particular 15°, to an imaginary plane extending horizontally through the axis of rotation on the inner lateral surface of the seal housing.
  • the medium flowing from the duct extension into the sealing chamber enters the sealing chamber at an angle of essentially 49° to 54°, in particular 51.5°, with respect to the imaginary plane extending horizontally through the axis of rotation.
  • the flushing medium can enter the sealing chamber with the direction of rotation of the shaft.
  • the angle is selected in such a way that the medium flowing into the sealing chamber essentially touches the outer surface of the shaft.
  • one of the channel extensions has a center line which is offset counterclockwise to an imaginary plane extending horizontally through the axis of rotation at an angle of essentially 31° to 36°, in particular 33.5°, on the inner lateral surface of the Seal housing ends.
  • the medium flowing out of the duct extension into the sealing chamber enters the sealing chamber at an angle of essentially 77° to 82°, in particular 79.5°, clockwise with respect to the imaginary plane extending horizontally through the axis of rotation.
  • the flushing medium thus enters the sealing chamber with the direction of rotation of the shaft.
  • the angle is selected in such a way that the medium flowing into the sealing chamber essentially touches the outer surface of the shaft.
  • the angle specifications given above for the medium flowing into the sealing chamber indicate the direction of the main jet; it goes without saying that the medium jet fans out or widens like a funnel when it exits the channel. This also provides good turbulence which helps break up the gas ring.
  • center line of at least one duct extension has an approximately tiered curve enables the flushing medium to flow through the wall of the seal housing with extremely low losses.
  • Another channel is advantageously formed in the wall of the seal housing, which is connected to a first connection piece and a second connection piece, with a cooling or heating medium being able to be supplied to the channel via one of the connection pieces and removed again via the other connection piece.
  • the seal housing can thus be optimally tempered.
  • seal housing is designed in one piece and is manufactured using a metallic 3D printing process.
  • the seal housing is preferably manufactured by means of Selective Laser Melting (SLM).
  • SLM Selective Laser Melting
  • the object of the invention is also achieved by a method for manufacturing a mechanical seal arrangement, according to which the seal housing is manufactured as a one-piece component by means of 3D printing, in particular metallic 3D printing, or investment casting.
  • the seal housing is preferably manufactured by means of selective laser melting (SLM).
  • FIG. 2 shows a mechanical seal arrangement corresponding to FIG. 1 in an enlarged representation
  • FIG. 3 shows a detailed representation of the seal housing of the mechanical seal arrangement according to the invention in a three-dimensional representation
  • Figures 6 and 7 show a schematic representation of the flushing channels provided in the seal housing.
  • Fig. 1 shows a mechanical seal arrangement 2 installed in a pump arrangement 1.
  • the pump arrangement 1 is a single-stage centrifugal pump with a shaft 3 that can be driven in rotation about an axis of rotation A.
  • the shaft 3 carries an impeller 4 at one end Impeller 4 is surrounded by a hydraulic housing 5 with a housing cover 6 .
  • the hydraulic housing 5 has an inlet opening 7 for sucking in a pumped medium and an outlet opening 8 for ejecting the pumped medium.
  • the housing cover 6 is arranged on the side of the hydraulic housing 5 opposite the inlet opening 7 .
  • the mechanical seal arrangement 2 is fastened to the side of the housing cover 6 opposite the hydraulic housing 5 .
  • the shaft 3 extends from a flow chamber 9 delimited by the hydraulic housing 5 and the housing cover 6 through the housing cover 6 , the mechanical seal arrangement 2 and through a bearing support housing 10 which is fastened to the housing cover 6 .
  • a roller bearing 11 is arranged on the side of the bearing support housing 10 opposite the housing cover 6 .
  • a bearing cover 12 closes the bearing support housing 10 on the side opposite the housing cover 6 .
  • the end of the shaft 3 opposite the impeller 4 is led out of the bearing support housing 10 and connected to an output shaft of a motor, not shown, in particular an electric motor.
  • the exemplary embodiment of the mechanical seal arrangement 2 comprises a shaft sleeve 15 that is slipped onto the shaft 3 and fastened to it with a clamping ring 14, and a seal housing 16 that is attached to the housing cover 6.
  • the clamping ring 14 is secured against displacement in the axial direction by means of snap rings 17.
  • the clamping ring 14 comprises threaded bores 18 into which screws 19 can be screwed, with which the shaft protective sleeve 15 is fixed to the shaft 3 in a manner secure against rotation and displacement.
  • the mechanical seal arrangement 2 also comprises a first sliding ring 20 rotating with the shaft sleeve 15, a second sliding ring 21 connected in a torque-proof manner to the seal housing 16, a spring device 22 urging the second sliding ring 21 against the first sliding ring 20 in the form of a spring device 22 mounted on the seal housing 16 in an axially displaceable manner Disc 23, springs 25 winding around screws 24 biasing the disc 23 and thus the second seal ring 21 against the first seal ring 20.
  • First slip ring 20 and shaft sleeve 15 are sealed against each other by means of a first sealing ring 26 .
  • Second sliding ring 21 and seal housing 16 are sealed against one another by means of a second sealing ring 27 .
  • the sealing housing 16 has a wall 29 surrounding a sealing space 28 in which a first channel 30 is formed, which is connected to a first connecting piece 31 shown in FIG. 3 and a second connecting piece 32 .
  • a cooling or heating medium can be supplied to the channel 30 via one of the connection pieces and removed again via the other connection piece.
  • the channel 30 is formed in the wall 29 in the manner of a screw.
  • FIG. 3 shows the seal housing 16 according to the invention in a 3D view.
  • the seal housing 16 has a connection device 33 .
  • connection device 33 communicates with a second channel 34 for supplying a medium into the sealing chamber 28.
  • a flushing medium can be fed in via the connection device 33 from outside the seal housing 16 via a pipe (not shown). or a hose.
  • the flushing channel 34 is divided into a first channel extension 35, a second channel extension 36 and a third channel extension 37, the three channel extensions opening into the sealing chamber 28 on the inner lateral surface of the seal housing 16.
  • the center line M1 shows the course of the first channel extension 35
  • the center line M2 shows the course of the second channel extension 36
  • the center line M3 the course of the third canal extension 37. It can be seen that the center lines M1 and M2 essentially have a symmetrical course.
  • the center lines M1 and M2 and thus the first channel extension 35 and the second channel extension 36 have an approximately tiered curve.
  • the center line M1 of the first channel extension 35 ends with an imaginary plane X extending perpendicularly through the axis of rotation A at an angle a of essentially 12° to 18°, in particular 15°, offset counterclockwise on the inner lateral surface of the seal housing 16.
  • the medium flowing out of the first channel extension 35 into the sealing chamber 28 enters the sealing chamber 28 at an angle ß of essentially 49° to 54°, in particular 51.5°, clockwise with respect to the imaginary plane X extending vertically through the axis of rotation A a.
  • the angle is selected in such a way that the medium flowing into the sealing chamber 28 touches the outer lateral surface of the shaft 3 .
  • the center line M2 of the second channel extension 36 ends at an imaginary plane Y extending horizontally through the axis of rotation A at an angle y of essentially 12° to 18°, in particular 15°, offset clockwise on the inner lateral surface of the seal housing 16.
  • the medium flowing out of the second channel extension 36 into the sealing chamber 28 enters the sealing chamber counterclockwise at an angle ⁇ of essentially 49° to 54°, in particular 51.5°, with respect to the imaginary plane Y extending horizontally through the axis of rotation A 28 a.
  • the angle is selected in such a way that the medium flowing into the sealing chamber 28 essentially touches the outer lateral surface of the shaft 3 .
  • the center line M3 of the third channel extension 37 ends with an imaginary plane Y extending horizontally through the axis of rotation A at an angle ⁇ of essentially 31° to 36°, in particular 33.5°, counterclockwise offset on the inner lateral surface of the seal housing 16.
  • the medium flowing out of the third channel extension 37 into the sealing chamber 28 occurs at an angle of essentially 77° to 82°, in particular 79.5°, clockwise with respect to the imaginary plane Y extending horizontally through the axis of rotation A. into the sealing space 28 .
  • the angle is selected in such a way that the medium flowing into the sealing chamber 28 essentially touches the outer lateral surface of the shaft 3 .
  • the sealing housing 16 described is advantageously designed in one piece and is manufactured using a metallic 3D printing process.
  • the seal housing 16 can be manufactured by means of selective laser melting (SLM), for example.
  • SLM selective laser melting

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne un ensemble garniture étanche à anneau glissant conçu pour un arbre (3) pouvant être entraîné de manière rotative autour d'un axe de rotation (A), comprenant un logement de garniture étanche (16) présentant une paroi (29), un espace de garniture étanche (28) défini par le logement de garniture étanche (16), un premier anneau glissant (20) disposé dans l'espace de garniture étanche (28) et un deuxième anneau glissant (22) coopérant avec le premier anneau glissant (20), ainsi qu'un dispositif de raccordement (33) formé dans le logement de garniture étanche (16) pour un canal (34) pour amener un milieu de rinçage dans l'espace de garniture étanche (28). Selon l'invention, le canal (34) se divise dans la paroi (29) du logement de garniture d'étanchéité (16) en une pluralité de prolongements de canal (35, 36, 37) en direction de l'espace de garniture étanche (28).
PCT/EP2022/081056 2021-11-15 2022-11-08 Ensemble garniture étanche à anneau glissant et pompe centrifuge pourvue d'un tel ensemble garniture étanche à anneau glissant WO2023083775A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021129726.5 2021-11-15
DE102021129726.5A DE102021129726A1 (de) 2021-11-15 2021-11-15 Gleitringdichtungsanordnung und Kreiselpumpe mit einer derartigen Gleitringdichtungsanordnung

Publications (1)

Publication Number Publication Date
WO2023083775A1 true WO2023083775A1 (fr) 2023-05-19

Family

ID=84365546

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/081056 WO2023083775A1 (fr) 2021-11-15 2022-11-08 Ensemble garniture étanche à anneau glissant et pompe centrifuge pourvue d'un tel ensemble garniture étanche à anneau glissant

Country Status (2)

Country Link
DE (1) DE102021129726A1 (fr)
WO (1) WO2023083775A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4979875A (en) * 1986-10-17 1990-12-25 Sihi Gmbh & Co. Kg Centrifugal pump for the delivery of hot liquids
EP1967774A1 (fr) * 2007-03-05 2008-09-10 Chugai High Technology Co., Ltd. Ensemble multi-arbres coaxial
US9618124B2 (en) * 2011-08-24 2017-04-11 Eagleburgmann Germany Gmbh & Co. Kg Cooled mechanical seal assembly
US9695941B2 (en) * 2014-02-25 2017-07-04 Eagleburgmann Germany Gmbh & Co. Kg Sliding ring seal with conveying sleeve
CN107429847A (zh) * 2015-03-09 2017-12-01 日本皮拉工业株式会社 端面接触型机械密封件
DE102019206205B3 (de) * 2019-04-30 2020-07-09 Eagleburgmann Germany Gmbh & Co. Kg Gleitringdichtungsanordnung, insbesondere für heiße Medien, sowie Pumpenanordnung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29721325U1 (de) 1997-12-02 1998-02-12 Burgmann Dichtungswerk Feodor Spülmedium-Beaufschlagungsanordnung für eine Gleitringdichtungsanordnung
DE202006019205U1 (de) 2006-12-20 2007-02-22 Burgmann Industries Gmbh & Co. Kg Dichtungsanordnung, insbesondere zum Abdichten klebriger flüssiger Produkte
DE102009020483B4 (de) 2009-05-08 2011-03-24 Thaletec Gmbh Gleitringdichtung und deren Anordnung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4979875A (en) * 1986-10-17 1990-12-25 Sihi Gmbh & Co. Kg Centrifugal pump for the delivery of hot liquids
EP1967774A1 (fr) * 2007-03-05 2008-09-10 Chugai High Technology Co., Ltd. Ensemble multi-arbres coaxial
US9618124B2 (en) * 2011-08-24 2017-04-11 Eagleburgmann Germany Gmbh & Co. Kg Cooled mechanical seal assembly
US9695941B2 (en) * 2014-02-25 2017-07-04 Eagleburgmann Germany Gmbh & Co. Kg Sliding ring seal with conveying sleeve
CN107429847A (zh) * 2015-03-09 2017-12-01 日本皮拉工业株式会社 端面接触型机械密封件
DE102019206205B3 (de) * 2019-04-30 2020-07-09 Eagleburgmann Germany Gmbh & Co. Kg Gleitringdichtungsanordnung, insbesondere für heiße Medien, sowie Pumpenanordnung

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Publication number Publication date
DE102021129726A1 (de) 2023-05-17

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