US3392789A - Sealing element - Google Patents

Sealing element Download PDF

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Publication number
US3392789A
US3392789A US574369A US57436966A US3392789A US 3392789 A US3392789 A US 3392789A US 574369 A US574369 A US 574369A US 57436966 A US57436966 A US 57436966A US 3392789 A US3392789 A US 3392789A
Authority
US
United States
Prior art keywords
hub
sealing element
blade
base plate
sealing
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
Application number
US574369A
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English (en)
Inventor
Wiberg Tore
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.)
Svenska Flaktfabriken AB
Original Assignee
Svenska Flaktfabriken AB
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 Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
Application granted granted Critical
Publication of US3392789A publication Critical patent/US3392789A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/34—Blade mountings
    • F04D29/36—Blade mountings adjustable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
    • B64C11/02—Hub construction
    • B64C11/04—Blade mountings
    • B64C11/06—Blade mountings for variable-pitch blades
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/34—Blade mountings
    • F04D29/36—Blade mountings adjustable
    • F04D29/362—Blade mountings adjustable during rotation
    • 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
    • F16J15/3436—Pressing means
    • F16J15/3456—Pressing means without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/06—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical
    • B63H3/08—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid
    • B63H2003/088—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid characterised by supply of fluid actuating medium to control element, e.g. of hydraulic fluid to actuator co-rotating with the propeller

Definitions

  • a sealing element for an axial fan with a variable pitch blade has a hub through which the blade projects and in which is provided a recess surrounding the blade shaft with a re-entrant surface substantially coplanar with the undersurface of the blade base plate.
  • the sealing element is of generally U-shaped cross section and is mounted freely in the recess so that the centrifugal force of rotation of the hub engages one leg of the element against the re-entrant surface of the hub and other other leg of the element against the undersurface of the fan base plate, the web of the element being free to twist in the recess to permit relative displacement between the two surfaces axially of the blade shaft.
  • the present invention relates to a sealing element for axial fans with adjustable blades, and more particularly to a sealing element mounted in the impeller between the hub and the base plate of a blade which is rotatable in the hub.
  • Fans equipped with blades adapted to be adjusted while in operation comprise a number of mechanical elements in the hub for rotating the blades.
  • flushing air was utilized for preventing dust from penetrating through the gap to the sensitive mechanical elements effecting the blade rotation.
  • the flushing air was supplied under pressure to the interior of the fan hub, in such a manner that the direction of the air flow through the gap counteracts the penetration of the dust.
  • Such an arrangement is complicated and requires both a supply of flushing air from special fans or other pressure sources, and arrangements for directing the flushing air through the clearance gap.
  • a primary object of the present invention is to eliminate the disadvantages involved in the conventional seals in an impeller, and at the same time to produce an effective and simple seal between the hub and the blade base plates rotatably mounted in the hub when the impeller is rotating about the hub axis.
  • This object is achieved substantially by mounting a U-shaped sealing element in a recess in the hub having a reentrant surface substantially coplanar with the undersurface of the blade base plate, so that the web of the sealing element bridges the clearance gap between the base plate and the hub, and the legs of the element are 3,392,789 Patented July 16,v 1968 pressed by centrifugal force against said coplanarsu'rfaces.
  • the sealing element must operate effectively also in the event of minor axial displacement between the stationary and the rotatable parts.
  • FIG. 1 is a cross section through a fan hub embodying a sealing element according to the invention
  • FIG. 2 is an enlarged sectional view showing the sealing element according to the invention, the sealing surfaces for the hub and the blade base plate being in normal position;
  • FIG. 3 shows the same detail as FIG. 2 with the sealing surfaces being displaced somewhat in relation to each other.
  • a circular blade base plate 2 and a blade 9 are connected to a shaft 10. Between the hub 1 and the blade base plate 2 there is formed a clearance gap 3 with a substantial rectangular cross section.
  • a recess 11 is formed in the huh I surrounding the blade shaft 10 below the base plate, in which a continuous sealing ring 4 is placed to bridge said gap 3.
  • Said sealing ring 4 has U- shaped cross section, its webs 12 being plane and its legs having the form of rounded beads 7 and 8. Upon the rotation of the impeller, said beads are pressed by the centrifugal force against two sealing surfaces 5 and 6.
  • One of the said surfaces 5 is a re-entrant surface formed in the hub 1 by the recess 11 and the other surface 6 is the undersurface of the blade base plate 2.
  • the surfaces 5 and 6 are normally coplanar, but in actual operation, differences in position between the surfaces may arise.
  • the sealing ring is made of an elastic flexible material, for example plastic, and clearance is provided below the web 12, so that the difference in position between the sealing surfaces 5 and 6 in axial direction are balanced by the twisting of the sealing ring (see FIG. 3).
  • an axial fan having a rotary hub, a fan blade, and a shaft mounting said blade for rotation about its axis within said hub, said blade being mounted on a circular base plate extending radially outward from said shaft and providing a clearance gap between said plate and said hub, the improvement wherein said hub is provided with a recess surrounding said shaft below said gap and having a re-entrant surface substantially coplanar with the marginal undersurface of said base plate, and a sealing element freely mounted in said recess comprising a ring having a U-shaped cross section with a plane web and bead-like legs projecting from the web, one of said legs projecting into engagement with said re-entrant surface and the other of said legs projecting into engagement sealing element bridges said clearance gap,---therotatien of said hub pressing said sealing element into sealing engagement with said surfaces by centrifugal force, the thickness of said Web being less than the thickness of said bead-like legs so as to twist and permit relative displacement of said legs axially of said shaft.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Sealing Devices (AREA)
  • Relay Circuits (AREA)
US574369A 1965-10-28 1966-08-23 Sealing element Expired - Lifetime US3392789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1391465 1965-10-28

Publications (1)

Publication Number Publication Date
US3392789A true US3392789A (en) 1968-07-16

Family

ID=20298220

Family Applications (1)

Application Number Title Priority Date Filing Date
US574369A Expired - Lifetime US3392789A (en) 1965-10-28 1966-08-23 Sealing element

Country Status (10)

Country Link
US (1) US3392789A (fr)
AT (1) AT257809B (fr)
BE (1) BE685194A (fr)
CH (1) CH456273A (fr)
ES (1) ES329593A1 (fr)
FI (1) FI42353B (fr)
FR (1) FR1501035A (fr)
GB (1) GB1104812A (fr)
NL (1) NL6610867A (fr)
NO (1) NO117189B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6254339B1 (en) * 1996-03-28 2001-07-03 Voith Siemens Hydro Power Generation, Inc. Hydro-turbine runner
WO2014096344A1 (fr) * 2012-12-21 2014-06-26 Multi-Wing International A/S Ventilateur modulaire à flux mixte

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485102A (en) * 1936-11-13 1938-05-13 Arthur Frederick Evans Improvements in variable-pitch airscrews for aircraft
US2421841A (en) * 1944-04-03 1947-06-10 Baldwin Locomotive Works Seal for hydraulic turbines and pumps
US2436612A (en) * 1942-10-28 1948-02-24 Curtiss Wright Corp Sealed propeller hub arrangement
US2514097A (en) * 1947-01-14 1950-07-04 Morgan Smith S Co Hub construction for variable pitch propellers or the like
DE1126736B (de) * 1958-08-22 1962-03-29 Klein Schanzlin & Becker Ag Lagerung fuer Verstellschaufeln axialer Kreiselmaschinen
US3231313A (en) * 1963-07-12 1966-01-25 Svenska Flaektfabriken Ab Axial fan with adjustable blades

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485102A (en) * 1936-11-13 1938-05-13 Arthur Frederick Evans Improvements in variable-pitch airscrews for aircraft
US2436612A (en) * 1942-10-28 1948-02-24 Curtiss Wright Corp Sealed propeller hub arrangement
US2421841A (en) * 1944-04-03 1947-06-10 Baldwin Locomotive Works Seal for hydraulic turbines and pumps
US2514097A (en) * 1947-01-14 1950-07-04 Morgan Smith S Co Hub construction for variable pitch propellers or the like
DE1126736B (de) * 1958-08-22 1962-03-29 Klein Schanzlin & Becker Ag Lagerung fuer Verstellschaufeln axialer Kreiselmaschinen
US3231313A (en) * 1963-07-12 1966-01-25 Svenska Flaektfabriken Ab Axial fan with adjustable blades

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6254339B1 (en) * 1996-03-28 2001-07-03 Voith Siemens Hydro Power Generation, Inc. Hydro-turbine runner
US6533536B1 (en) 1996-03-28 2003-03-18 Voith Hydro, Inc. Hydro-turbine runner
WO2014096344A1 (fr) * 2012-12-21 2014-06-26 Multi-Wing International A/S Ventilateur modulaire à flux mixte

Also Published As

Publication number Publication date
FI42353B (fr) 1970-03-31
NL6610867A (fr) 1967-05-02
AT257809B (de) 1967-10-25
NO117189B (fr) 1969-07-14
CH456273A (de) 1968-05-15
BE685194A (fr) 1967-01-16
GB1104812A (en) 1968-02-28
ES329593A1 (es) 1967-05-16
FR1501035A (fr) 1967-11-10

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