US3487785A - Slip-ring sealing structure in a centrifugal pump - Google Patents

Slip-ring sealing structure in a centrifugal pump Download PDF

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Publication number
US3487785A
US3487785A US757557A US3487785DA US3487785A US 3487785 A US3487785 A US 3487785A US 757557 A US757557 A US 757557A US 3487785D A US3487785D A US 3487785DA US 3487785 A US3487785 A US 3487785A
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United States
Prior art keywords
slip
impeller
pressure
membrane
rear side
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
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US757557A
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English (en)
Inventor
Emile Egger
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EMILE EGGER AND CO AG
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EMILE EGGER AND CO AG
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Publication date
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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
    • F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
    • 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
    • F04D29/128—Shaft sealings using sealing-rings especially adapted for liquid pumps with special means for adducting cooling or sealing fluid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/93—Seal including heating or cooling feature

Definitions

  • This invention relates to slip-ring sealing structure in a centrifugal pump, having a first slip-ring fixed on the pump shaft and a second slip ring suspended at the pump casing by means of an annular membrane allowing axial displacement of the second slip ring.
  • a number of slip-ring sealing assemblies of this type are known, whereby it has also been suggested to insert annular spring elements into such membranes for elastically urging the axially movable slip ring against the slip ring fixed on the pump shaft.
  • the slip-ring sealing structur according to this invention boardly comprises a slip ring fixed on the pump shaft and a slip ring suspended at the pump casing by means of an annular membrane, this membrane and second membrane means being each disposed between the space at the rear side of the pump impeller and a pressure space filled with pressure fluid, whereby the pressure at the rear side of the impeller simultaneously acts at one side of said annular membrane directly and at the other side through said second membrane means and pressure space respectively.
  • the pressure existing at the rear side of the impeller is also transmitted to and acts on the rear side of the annular membrane carrying the one slip ring.
  • the influence of the pressure existing at the rear side of the impeller onto the annular membrane carrying the one slip ring may practically be compensated so that the slip rings may be urged against each other with a constant pressure produced by spring action or any other means.
  • Preferably means may be provided for particularly etficient cooling of the slip rings. It is a particular object of this invention to build up a counter-pressure at the side of the slip rings opposite to the medium to be pumped, this counter-pressure being preferably maintained at a value somewhat higher than the highest value of pressure to be expected in the space at the rear side of the impeller. In this way lubrification of the slip rings will always be eflected by the clean medium admitted to the rear side of the slip rings and not by the contaminated medium to be pumped.
  • the drawing shows an axial section of the important parts of the pump.
  • An impeller 2 is fixed on the pump shaft 1.
  • This impeller has release apertures 3 opening radially into the canals 4 of the impeller 1, wherein the medium to be pumped flows in substantially radial direction.
  • An annular carrier 5 is clamped. between the hub of the impeller and a shoulder of shaft. 1, a first slip ring- 6 with a slip pad 7 being fixed on carrier 5.
  • Slip pad 7 contacts the slip pad 9 of another slip ring 8 fixed in a flange portion 10 at the one end of a sleeve 11.
  • the other end of sleeve 11 is axially displaceably guided in a bore of the pump casing and is sealed in this bore by means of a sealing ring 12.
  • a ring 11a is inserted into the same bore and sealed therein by means of a sealing ring, this ring 11a carrying a separating tube 13 maintained in coaxial position within the sleeve 11 by means of bosses 13a engaging the inner surface of sleeve 11.
  • the separating tube 13 extends from the ring 11a into the space inside slip ring 6 and thus subdivides the annular space between sleeve 11 and shaft 1 into two coaxial annular spaces 14 and 15 communicating with each other inside the slip ring 6.
  • the outer space 15 communicates through a bore 16 of sleeve 11 with a duct 17 having a threaded portion 18 at its outer end for connection of a fluid conduit.
  • the inner annular space 14 communicates with a duct 19 outside ring 13, duct 19 having also a threaded portion 20 for connection of a fluid conduit.
  • the annular space 14 and the duct communicating therewith are sealed by means of a sealing ring 22 inserted in a flang portion 21 of the casing.
  • the sleeve 11 and flange portion 10 are connected in sealing condition to a flexible membrane 23 of rubber, plastics material or the like, of which the outer rim is clamped between rings 24 and 25 of the pump casing. Due to its flexibility the membrane 23 allows limited axial displacement of the flange 10, of sleeve 11 and of the slip ring 8 supported thereon.
  • An annular pressure chamber portion 26 is formed outside the annular membrane 23, this pressure chamber portion communicating through bores 27 of the casing and of ring with another annular chamber portion 28 which communicates through bores 29 of the pump casing with a third annular chamber portion 30.
  • Annular chamber portion 30 is separated from the space at the rear side of the impeller by means of a flexible membrane 31 similar to membrane 23.
  • the annular chamber portions 26, 28 and 30 and the bores interconnecting them are completely filled with a practically incompressible fluid, preferably oil.
  • a practically incompressible fluid preferably oil.
  • the filling opening 32 of these communicating chambers which is shown in open condition in the drawing, is usually closed by means of a sealing screw. By inserting this screw more or less into the bore 32, a certain overpressure may be produced in the pressure chamber 263t).
  • a tube 33 is fixed on a shoulder at the rear side of the impeller, this tube 33 extending rearwardly over the slip rings and thus forces fluid flowing from the rear side of the impeller through the release apertures 3 to circulate over the slip rings thereby providing for eflicient cooling of the same.
  • a pressure spring 34 acts between the casing and the inner rim of the membrane 23 for urging the slip ring 8 against slip ring 6.
  • the pressure built up at the rear side of the impeller is transmitted through the flexible membrane 31 to the fluid contained in the pressure chamber 26-30, and consequently this pressure is transmitted tothe rear side (right side in the drawing) of the membrane 23.
  • the surfaces at the front and rear side of the membrane 23 whereon the pressure at the rear side of the impeller acts directly and indirectly through membrane 31 and pressure chamber 26-30 respectively, are so dimensioned that the forces acting on the membrane 23 practically compensate each other and that under all circumstances the pressure acting directly from the rear side of the impeller onto the left side of membrane 23 will never exceed the pressure acting in opposite direction from the pressure chamber 2630 so that there is no danger for slip ring 8 being lifted off slip ring 6.
  • the pressure, by which the slip rings are urged against each other is practically constant and determined by the pressure of spring 34.
  • Pressure variations in the space at the rear side of the impeller are immediately transmitted through membrane 31 and pressure chamber 2630 to the rear side of membrane 23 so that no appreciable changes of the pressure acting between the slip rings will occur.
  • the fluid in the pressure chamber 2630 may have a certain overpressure or bias pressure, in which case fluid pressure acting on membrane 23 is added to the pressure of spring 34 for urging the slip rings against each other. Nevertheless pressure variations at the rear side of the impeller are transmitted through membrane 31.
  • cooling water may be admitted through duct 19 through the inner annular space 14 forewardly, round the fore edge of tube 13 and returns along the inner side of the slip rings back through the outer annular space 15 and duct 17.
  • Water from the town water supply may be used.
  • a closed circulation of cooling fluid may also be set up by means of a circulating pump, and in this case oil may also be used as a cooling medium.
  • the cooling medium must not be circulated, in which case the one duct 18 or 20 may be shut off and the other may be connected to a suitable pressure source adapted to maintain the static pressure in the annular spaces 14 and 15 but does not circulate the cooling medium.
  • a slip-ring sealing structure in a centrifugal pump comprising a pump shaft, a first slip ring fixed on the pump shaft, a pump casing, a second slip ring axially displaceably suspended on the pump casing by means of a first annular membrane, an impeller and a space formed between the rear side of the impeller and the pump casing, second membrane means having one side thereof facing said space of the rear side of the impeller, and a pressure chamber formed in said casing, the other side of said second membrane and one side of said annular membrane facing said pressure chamber; and means for biasing said second slip ring into engagement with the first slip ring.
  • a sealing structure according to claim 1, comprising spring means urging said second slip ring against said first slip ring fixed on the pump shaft.
  • a sealing structure according to claim 1, comprising release apertures and flow canals in said impeller, said release apertures opening into said flow canals substantially in the direction of fluid flow in said canals.
  • a sealing structure according to claim 4 comprising a tube fixed at the rear side of the impeller outside said release apertures and extending rearwards from the impeller coaxially to the impeller shaft, said slip rings being located inside said tube.
  • a sealing structure according to claim 1, comprising an annular space formed between the slip rings and the pump shaft, this annular space communicating with at least one fluid connection at the pump casing.
  • a sealing structure according to claim 6, com-prising a tubular separating wall axially extending through said annular space, said annular space being thereby subdivided into an inner and an outer portion communicating each with a separate fluid connection at the pump casing.
  • a sealing structure according to claim 7, comprising a sleeve carrying said. se ond slip ring at one end and said tubular separating Wall at its other end, said other end of the sleeve being displaeeably guided in sealing condition in the pump casing.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US757557A 1967-09-23 1968-09-05 Slip-ring sealing structure in a centrifugal pump Expired - Lifetime US3487785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1330167A CH480573A (de) 1967-09-23 1967-09-23 Schleifringdichtung in einer Kreiselpumpe

Publications (1)

Publication Number Publication Date
US3487785A true US3487785A (en) 1970-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US757557A Expired - Lifetime US3487785A (en) 1967-09-23 1968-09-05 Slip-ring sealing structure in a centrifugal pump

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US (1) US3487785A (de)
CH (1) CH480573A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103967844A (zh) * 2014-03-24 2014-08-06 江苏大学 一种外装式单级叶轮矿用立式潜水泵的带圆筒上口环结构

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB228945A (de) * 1924-02-08 1925-05-21 International General Electric Company
US1721737A (en) * 1927-07-29 1929-07-23 Bryan P Joyce Pressure-fluid packing
US1835877A (en) * 1928-09-20 1931-12-08 Bryan P Joyce Packing
GB615898A (en) * 1945-08-22 1949-01-13 Gen Electric Co Ltd Improvements in voltage supply devices
US2698584A (en) * 1949-08-13 1955-01-04 Stelzer William Centrifugal pump
GB729327A (en) * 1952-06-13 1955-05-04 Karl Wernert Improvements in rotatable shaft packings
US2949321A (en) * 1957-01-26 1960-08-16 Borg Warner Mechanical seal for liquid oxygen pump

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB228945A (de) * 1924-02-08 1925-05-21 International General Electric Company
US1721737A (en) * 1927-07-29 1929-07-23 Bryan P Joyce Pressure-fluid packing
US1835877A (en) * 1928-09-20 1931-12-08 Bryan P Joyce Packing
GB615898A (en) * 1945-08-22 1949-01-13 Gen Electric Co Ltd Improvements in voltage supply devices
US2698584A (en) * 1949-08-13 1955-01-04 Stelzer William Centrifugal pump
GB729327A (en) * 1952-06-13 1955-05-04 Karl Wernert Improvements in rotatable shaft packings
US2949321A (en) * 1957-01-26 1960-08-16 Borg Warner Mechanical seal for liquid oxygen pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103967844A (zh) * 2014-03-24 2014-08-06 江苏大学 一种外装式单级叶轮矿用立式潜水泵的带圆筒上口环结构

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Publication number Publication date
CH480573A (de) 1969-10-31

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