EP1724470A2 - Kreiselpumpendichtung - Google Patents

Kreiselpumpendichtung Download PDF

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Publication number
EP1724470A2
EP1724470A2 EP06405187A EP06405187A EP1724470A2 EP 1724470 A2 EP1724470 A2 EP 1724470A2 EP 06405187 A EP06405187 A EP 06405187A EP 06405187 A EP06405187 A EP 06405187A EP 1724470 A2 EP1724470 A2 EP 1724470A2
Authority
EP
European Patent Office
Prior art keywords
seal
pump
shaft
static seal
accordance
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Withdrawn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
EP06405187A
Other languages
English (en)
French (fr)
Other versions
EP1724470A3 (de
Inventor
Heikki Manninen
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.)
Sulzer Pumpen AG
Original Assignee
Sulzer Pumpen AG
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 Sulzer Pumpen AG filed Critical Sulzer Pumpen AG
Publication of EP1724470A2 publication Critical patent/EP1724470A2/de
Publication of EP1724470A3 publication Critical patent/EP1724470A3/de
Withdrawn legal-status Critical Current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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/14—Shaft sealings operative only when pump is inoperative
    • F04D29/146—Shaft sealings operative only when pump is inoperative especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/106—Shaft sealings especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps

Definitions

  • the present invention relates to a centrifugal pump and a static seal of dynamic sealing thereof.
  • the invention especially relates to modifying the attachment of said static seal and a seal cover acting as a counter ring thereof in such a way that, for example, when the static seal wears, the clearance thereof can be adjusted without a need to stop the pump.
  • a dynamic sealing is a sealing arrangement, which is able to without any mechanical contact seal a centrifugal pump during its operation so that no liquid leaks along the shaft towards the bearings and the drive.
  • Other sealing arrangements for the same purpose are, for example, braided packings and slide ring seals, which both require mechanical contact between the rotary and stationary surface.
  • a dynamic sealing is located behind the pump volute in front of the pump bearing (seen from the suction duct) in an annular chamber arranged in connection with the rear wall of the pump.
  • Said chamber is in direct flow connection with the pump volute, where the pump impeller rotates.
  • a rotary disc attached on the pump shaft divides said chamber to an impeller side cavity and a pump bearing side cavity.
  • Said disc is provided with vanes facing the bearing side cavity, whereby it can also be called a repeller, whereas the other side of the disc is even.
  • said annular chamber contains liquid
  • the vanes on said disc tend to pump the liquid first radially outwards and then around the outer edge of the disc to the impeller side cavity of the chamber.
  • WO-A1-03/040598 and CA-C-1,3173,29 relate to static seals.
  • the following description discusses two other basic types of a static seal, which can be considered the basis of the present invention.
  • a disc which is manufactured of a flexible material and extends radially towards the pump shaft, is attached to the pump housing or to the cover thereof and has a ring attached on the shaft to act as counter member for the flexible disc.
  • Said ring has been mounted on the shaft in such a way that when the liquid flows from the pump to the shaft space, it presses the flexible disc against the ring on the shaft, or more precisely against the sealing surface of said ring.
  • Another alternative which is discussed below more in detail, is naturally to arrange a disc of flexible material on the shaft and its stationary counterpart to the pump housing or to the cover of the housing. The operating principle, however, remains the same in both cases.
  • Both seals are rotary, and the purpose of the inflexible seal ring closer to the dynamic sealing is to prevent the liquid from flowing to the outer seal ring acting as the main seal, and therethrough, further out. Since both seals have been assembled on the shaft inside the pump housing the possible adjustment of the clearance is difficult and can be performed only by stopping the pump.
  • a static seal of the dynamic sealing typically used as the shaft seal of a centrifugal pump is, as described above, formed of a stationarily assembled, flexible disc, and a rotary counter ring attached with a locking screw to the shaft.
  • the present invention aims at eliminating at least some of the problems and disadvantages of the prior art centrifugal pumps by disclosing, for example, a static seal to be applied in a centrifugal pump.
  • a static seal to be applied in a centrifugal pump.
  • Fig. 1 schematically illustrates a conventional construction for a static seal of a dynamic sealing of a centrifugal pump in accordance with the prior art.
  • An impeller (not shown in the drawing) of a centrifugal pump pumps liquid entering the pump from the left along a suction duct to a pressure opening of the pump volute.
  • the impeller is attached to a pump shaft 12, which is mounted with bearings to the right, the part being already cut away, to the pump housing.
  • the space in the pump behind the impeller is limited by a pump rear wall 20.
  • a disc 30 attached to the pump shaft 12, located in an annular sealing chamber 32 arranged in connection with the rear wall 20 of the pump acts as dynamic sealing of the pump, and is called a repeller.
  • the rotary disc 30 i.e.
  • the repeller attached to the shaft 12 divides the chamber 32 to an impeller side cavity 34 and a pump bearing side cavity 36 in such a way that there is a flow connection between said cavities outside the outer edge of the rim of the disc 30.
  • Said disc 30 is provided with vanes 38 on the side facing said bearing side cavity 36 substantially throughout the whole radial dimension of the disc, while the opposite side is even.
  • the purpose of the repeller vanes 38 is to pump liquid in the bearing side cavity 36 outwards towards the impeller side cavity 34, which again is affected by the pressure generated by the impeller of the pump reduced by the counter pressure generated by the rear vanes of the impeller.
  • the vanes 38 of the repeller generate a pressure affecting from cavity 36 to space 34 and towards the impeller of the pump, by means of which the pressure prevailing in the space behind the impeller is balanced.
  • a typically used static seal of the above described dynamic sealing of a centrifugal pump is a flexible static plate or disc 40 arranged behind the dynamic sealing as seen from the impeller, which static plate or disc is attached by means of a ring 46 and bolts or headless screws 48 to the pump housing or the cover of the housing, and which, when the pump stops, is pressed against a counter ring 42 of the rotary static seal 40 on the shaft 12 and prevents liquid from flowing out of the pump.
  • the liquid entering from the direction of the impeller thus, presses the seal disc 40 against the counter ring 42.
  • the counter ring 42 is attached on the shaft 12 with one or more screws.
  • Fig. 2 illustrates a seal arrangement in accordance with a preferred embodiment of the invention.
  • the structure of the known static seal arrangement of Fig. 1 is changed opposite in such a way that the flexible plate 40 that acted as a static seal member is redesigned and made rotary and the rotary stationary counter ring 42 is now manufactured as a a static seal member.
  • a novel, flexible seal means 50 is located on the pump shaft behind the dynamic sealing and it, among other things, prevents, according to a preferred embodiment of the invention, the shaft 12 from coming into contact with the liquid to be pumped.
  • a novel, static, i.e. stationary counter ring 60 in accordance with the invention is naturally located behind the flexible seal means 50 as seen from the impeller of the pump.
  • the flexible seal means 50 of the new static seal is rotary, it is possible, by means of centrifugal force, to keep liquid and particles possibly entrained therewith away from between the rotary seal means and the static seal means.
  • the flexible seal means 50 of the static seal is of its form, according to a preferred embodiment of the invention, a tubular cylinder having an even diameter at the part 52 facing the pump impeller, followed by a constricted part 54 which has a smaller diameter than the part 52, the purpose of which part 54 is to ensure the flexibility of the seal, and further followed by a lip 56 having a larger diameter and facing the stationary counter ring 60.
  • the axial dimension of said seal lip 56 is less than that of the part 52. Further, the axial dimension of the lip 56 diminishes towards the radially outer tip of the lip.
  • a sealing surface 58 of the flexible seal means 50 which is preferably substantially perpendicular to the shaft 12 and which is pressed against the end surface of the counter ring 60, may be either straight or at least partially inclined while the tip of the lip 56 is closer to the surface of the counter ring.
  • the sealing surface 58 is inclined by a suitable dimensioning, the tip of the lip tends to turn outwards, due to the centrifugal force, when the pump is started, and, at the same time, slightly away from the counter ring 60, in other words spaced apart from the counter ring 60, whereby wearing of the static seal can be reduced.
  • the counter ring 60 which is a part of an annular seal cover 62 attached to the cover of the pump housing or to the housing 72 acts as a counterpart of the flexible seal means 50 of the static seal.
  • the seal cover 62 is attached to the pump housing or to the cover of the housing by means of a flange 64 extending from an otherwise substantially tubular seal cover 62.
  • the flange 64 is provided with openings required for attachment bolts or headless screws 66, by means of which the seal cover is attached to the pump housing 72 or the cover of the housing.
  • the adjustment has been arranged in connection with the seal cover 62 attached to the cover of the pump housing or to the housing, whereby, when the static seal wears, the clearance thereof can be adjusted while the pump is running. Thereby, the adjustment can be performed more easily and quickly than with the conventional solution.
  • the flexible seal means 50 of a static seal protects the shaft 12 from the liquid to be pumped. If the flexible seal means 50 is humidity-permeable or leaks towards the bearing, it is possible, according to a preferred embodiment of the invention, to collect the leakage to a seal cover 62 operating as a counterpart of the flexible seal means 50 and, further, remove therefrom in a controlled manner to a collection system 70.
  • the seal cover 62 can be extended towards the pump bearing, as is tentatively disclosed in the drawing, so that the rotary shaft 12 may be covered with the seal cover, whereby there is no risk of touching the rotating shaft when adjusting the clearance of the static seal, nor does it prevent the adjustment of the clearance, as was the case in the prior art solutions.
  • the seal cover with its counter ring and flange and extension is illustrated as one unitary member. It is, of course, possible that the seal cover is made of several elements. It is, for example, possible that the counter ring is a separate part attached together with the flange and shaft cover when assembling the seal. In the similar way, also other modifications are possible. It is, for example, possible that the shaft cover is not an integrated part of the seal cover, but a separate part utilizing the attachment bolts and headless screws thereof in the attachment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Devices (AREA)
EP06405187A 2005-05-16 2006-04-28 Kreiselpumpendichtung Withdrawn EP1724470A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20050518A FI20050518A (fi) 2005-05-16 2005-05-16 Keskipakopumppu ja sen seisontatiiviste

Publications (2)

Publication Number Publication Date
EP1724470A2 true EP1724470A2 (de) 2006-11-22
EP1724470A3 EP1724470A3 (de) 2008-11-05

Family

ID=34630086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06405187A Withdrawn EP1724470A3 (de) 2005-05-16 2006-04-28 Kreiselpumpendichtung

Country Status (7)

Country Link
US (1) US20060280599A1 (de)
EP (1) EP1724470A3 (de)
JP (1) JP2006322455A (de)
CN (1) CN1865710A (de)
BR (1) BRPI0601781A (de)
CA (1) CA2546153A1 (de)
FI (1) FI20050518A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2055962A1 (de) 2007-11-05 2009-05-06 Sulzer Pumpen AG Zentrifugalpumpe, Schafthülse und stationäres Verschlusselement

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9322412B2 (en) 2010-08-31 2016-04-26 Linatex Limited Adjustment mechanism for pump seal
CN103557311B (zh) * 2013-11-22 2017-01-11 湖南南方宇航高精传动有限公司 一种用于在轴上密封端盖的密封装置
CN107995938B (zh) * 2015-08-06 2020-03-06 株式会社荏原制作所 轴封装置以及包括该轴封装置的立轴泵
CN113446255B (zh) * 2021-08-06 2024-08-06 宜兴市宙斯泵业有限公司 一种可实现冷却水自循环的离心泵用机械密封

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD82645A (de) *
US2258527A (en) * 1939-01-10 1941-10-07 Warman Charles Harold Centrifugal pump
GB1096816A (en) * 1965-02-15 1967-12-29 Trist Mouldings & Seals Ltd Shaft glands
DE4002245A1 (de) * 1990-01-26 1991-08-22 Werner Dipl Ing Arnswald Tauchmotorpumpe
EP1596070A1 (de) * 2004-05-11 2005-11-16 Voith Paper Patent GmbH Vorrichtung zum Abdichten einer Wellendurchführung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418919A (en) * 1983-03-01 1983-12-06 Borg-Warner Corporation Mechanical seals with setting block for use with slurry pumps
US4575306A (en) * 1984-08-28 1986-03-11 Kaiser Aluminum & Chemical Corporation Slurry pump mechanical seal mounting assembly
US4653980A (en) * 1985-08-29 1987-03-31 Borg-Warner Industrial Products, Inc. Mechanical seal for pumps and method of fabricating same
AUPN143795A0 (en) * 1995-03-01 1995-03-23 Sykes Pumps Australia Pty Limited Centrifugal pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD82645A (de) *
US2258527A (en) * 1939-01-10 1941-10-07 Warman Charles Harold Centrifugal pump
GB1096816A (en) * 1965-02-15 1967-12-29 Trist Mouldings & Seals Ltd Shaft glands
DE4002245A1 (de) * 1990-01-26 1991-08-22 Werner Dipl Ing Arnswald Tauchmotorpumpe
EP1596070A1 (de) * 2004-05-11 2005-11-16 Voith Paper Patent GmbH Vorrichtung zum Abdichten einer Wellendurchführung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2055962A1 (de) 2007-11-05 2009-05-06 Sulzer Pumpen AG Zentrifugalpumpe, Schafthülse und stationäres Verschlusselement
US8337152B2 (en) 2007-11-05 2012-12-25 Sulzer Pumpen Ag Centrifugal pump, a shaft sleeve and a stationary seal member
US9353763B2 (en) 2007-11-05 2016-05-31 Sulzer Pumpen Ag Centrifugal pump, a shaft sleeve and a stationary seal member

Also Published As

Publication number Publication date
BRPI0601781A (pt) 2007-01-09
CA2546153A1 (en) 2006-11-16
CN1865710A (zh) 2006-11-22
US20060280599A1 (en) 2006-12-14
EP1724470A3 (de) 2008-11-05
FI20050518A (fi) 2006-11-17
JP2006322455A (ja) 2006-11-30
FI20050518A0 (fi) 2005-05-16

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