EP0175533A2 - Assemblage d'un arbre et d'une hélice à plusieurs pales - Google Patents

Assemblage d'un arbre et d'une hélice à plusieurs pales Download PDF

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Publication number
EP0175533A2
EP0175533A2 EP85306384A EP85306384A EP0175533A2 EP 0175533 A2 EP0175533 A2 EP 0175533A2 EP 85306384 A EP85306384 A EP 85306384A EP 85306384 A EP85306384 A EP 85306384A EP 0175533 A2 EP0175533 A2 EP 0175533A2
Authority
EP
European Patent Office
Prior art keywords
shaft
air
slip ring
propeller
passages
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.)
Granted
Application number
EP85306384A
Other languages
German (de)
English (en)
Other versions
EP0175533A3 (en
EP0175533B1 (fr
Inventor
Eric Raymond May
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.)
Kamewa AB
Original Assignee
Vickers PLC
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
Priority claimed from GB8503934A external-priority patent/GB2164306B/en
Application filed by Vickers PLC filed Critical Vickers PLC
Publication of EP0175533A2 publication Critical patent/EP0175533A2/fr
Publication of EP0175533A3 publication Critical patent/EP0175533A3/en
Application granted granted Critical
Publication of EP0175533B1 publication Critical patent/EP0175533B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/34—Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/18—Propellers with means for diminishing cavitation, e.g. supercavitation

Definitions

  • This invention relates to a multi-bladed propeller and shaft assembly in which air can be fed to the propeller blades to suppress cavitation.
  • Cavitation at a rotating marine propeller is undesirable because it produces undesirable effects; the two principal ones being noise that is transmitted through the water and erosion of the blade material.
  • the air has traditionally been fed from an inboard compressor through a slip ring and down the whole length of the shaft, but this arrangement suffers from a number of disadvantages.
  • the air feed arrangements require a multiplicity of inter-section joints, all of which have to be sealed. Hydraulic systems may also pass down the shaft, and a loss of integrity of the air supply can give rise to problem with these systems.
  • a solution to this problem described in GB-A-2050278 is to locate a split slip-ring about the shaft with two annular sealing rings in the aft face thereof wiping against the forward face of the propeller assembly.
  • the sealing rings are made of a composition comprising a phenolic resin and asbestos and a passage in the propeller hub leading to the propeller blades rotates in the annulus between the sealing rings, thereby giving a seal that is air-tight and maintains its integrity upon radial and axial movement of the propeller.
  • the arrangement described is relatively complex, and it is an object of this invention to provide a similar air delivery facility that is less complex in construction but is at least equally effective.
  • a tailshaft 10 having an inner sleeve 11 thereon is supported beneath the hull of a vessel by means of an A-bracket 12 that supports a shaft bearing 13.
  • the tailshaft 10 extends aft of the bearing 13 and terminates in a tail flange 14 that is attached to a propeller hub body by means of fixing bolts (not shown) and by means of driving dowels 16 that transmit the driving torque from the flange 14 to the hub body 15.
  • the propeller is of variable pitch and has blades 17 mounted for rotation in the hub body 15 so that the angle of each blade may be varied.
  • an outer sleeve 18 terminating in a flange 19 that is fastened to the forward face of the tail flange 14.
  • Radial inlet passages in the cylindrical side surface of the sleeve 18 lead to axial flow passages 21 sealed at their ends by forward and aft seals 22, 23 let into the inner sleeve 11.
  • the passages 21 lead to radial passages 24 drilled in the flange 19 and closed at their outer ends by means of plugs. Fluid from the radial passages 24 is discharged through outlet passages 26 in the aft face of the flange 19 into liners 27 that lead through the flange 14, through the driving dowels 16 which are annular in section, and into the hub body 15.
  • each liner 27 is flanged at 28 to mate with a recess in the aft face of the flange 19 about the passage 26 and is fluid-tightly sealed by means of an O-ring 29 let into the face of the flange 28.
  • the aft end of the liner 27 is sealed to the hub body 15 by means of an O-ring 30.
  • the hub body 15 is formed with a forward bore into which the dowel 16 and liner 27 fit that is separated from an aft bore leading to the blade periphery by means of a shoulder 31.
  • a mouthpiece 32 is urged by compression spring 33 against the periphery of the blade 17, the shoulder 31 serving to provide an abutment for the spring 33.
  • the mouth 34 of the mouthpiece 32 is generally rectangular in end view with its major direction parallel to the direction of rotation of the blade 17 in the hub body 15 whereby fluid communication between the hub bore and a bore 35 in the blade 17 is maintained over the relatively small range of pitch angles at which air fed to the blades gives desirable results.
  • air or other fluid fed into the inlet 20 passes along passages 21, 24, 26, through the hollow dowels 16 into the hub body 15 from which it is fed via mouthpieces 32 into the channels 35 and thence to the blades.
  • An O-ring 36 in the blade periphery seals against the hub body 15 to prevent seawater ingress to the interface between the mouthpiece 32 and the blade periphery, thereby obviating marine growth.
  • An outer ring 40 on the flange 14 provides both porotection against sea-water ingress to the flange 14 and a smooth external profile between the flange 19 and the hub body 15 and has O-rings 41, 42 in its end faces to prevent seawater ingress.
  • a slip ring assembly generally indicated by the reference numeral 45 is supported for rotation on the outer sleeve 18 by means of fore and aft split bearings 46, 47 in a housing 48.
  • a pair of axially spaced air seals 49, 50 are also supported in the housing 48 for wiping contact with the sleeve 18, and they define therewith an annular space 51 within which the inlet passage 20 rotates.
  • the air seals are segmented and the segments are urged into contact with the sleeve 18 by means of garter springs 52.
  • the inner faces of the seals 49, 50 are sealed to the housing 48 by means of O-rings 53.
  • Anti-rotation pins 44 prevent the individual segments of the seals 49, 50 from rotating in the housing 48.
  • Air is fed down the A-bracket through feed pipe 54 that leads through elbow 55 to a coupling or "bellows" 56 of resiliently flexible material that is bolted to the housing 48, whereby air can be fed down the A-bracket into the bellows 56 and thence via radial bore 57 in the housing 48 to the annular space 51.
  • the slip ring is restrained from rotating about the outer sleeve 18 by means of an anti-rotation device, and a preferred such device is illustrated in Figure 2.
  • the housing 48 is provided with one or more radially projecting spigots 60 that are held by rubber bushes 61 in anti-rotation arms 62 that are bolted to the A-bracket 12.
  • the slip ring assembly 45 is shown in more detail in Figures 4a-4c and is seen to consist of a housing formed in halves 48a, 48b that are flanged at their ends and are secured together by bolts 70 through the flanges.
  • the housing is formed of three coaxial rings fastened together by means of bolts 71 with a central ring 72 recessed at its forward and aft faces to define with outer rings 73, 74 channels that receive the air seals 49, 50, each outer ring 73, 74 being formed with a channel that receives one of the bearings 46, 47.
  • Each bearing 46, 47 is formed in two halves that are retained in its respective half outer ring by end washers 75 that locate against the end faces of the half ring.
  • the individual segments of the seals 49, 50 have overlapping features on either end to minimise the potential leakage of air to the surrounding water.
  • the outer surfaces of the segments are recessed to accommodate the garter spring and a number of radial passages through the segments allow passage of lubricating water.
  • FIG. 5 A preferred construction of seal housing assembly is shown in Figures 5, 6 and 7 in the context of a fixed pitch propeller.
  • the arrangement is generally similar to that of Figure 1 except that the tailshaft 10 is not flanged and the hub body 15 is bolted directly to the outer sleeve flange 19 by means of bolts 90, the radial passages 24 leading direct into passages 35' leading through the hub body 15 to the blades.
  • An aft extension 92 of the sleeve 18 fits within a recess in the hub 15, being approximately coextensive with the inner sleeve 11.
  • the water supply from the A-bracket 12 to the seals 49, 50 is shown in Figure 6.
  • the water feed is through a separate pipe that enters the housing 48 at a radial position spaced from the bore 57 via an inlet 93 that branches to fore and aft axial channels 94, 95 leading through radial channels 96, 97 to the rear face of respective seals 49, 50, the radial drilling 84 in the seals serving to lead the water to the working face of the seals.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Sealing Of Bearings (AREA)
  • Sealing Devices (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19850306384 1984-09-17 1985-09-09 Assemblage d'un arbre et d'une hélice à plusieurs pales Expired EP0175533B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8423433 1984-09-17
GB8423433 1984-09-17
GB8503934A GB2164306B (en) 1984-09-17 1985-02-15 Multi-bladed propeller and shaft assembly
GB8503934 1985-02-15

Publications (3)

Publication Number Publication Date
EP0175533A2 true EP0175533A2 (fr) 1986-03-26
EP0175533A3 EP0175533A3 (en) 1986-08-27
EP0175533B1 EP0175533B1 (fr) 1988-12-14

Family

ID=26288231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850306384 Expired EP0175533B1 (fr) 1984-09-17 1985-09-09 Assemblage d'un arbre et d'une hélice à plusieurs pales

Country Status (3)

Country Link
EP (1) EP0175533B1 (fr)
CA (1) CA1254799A (fr)
DE (1) DE3566791D1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2403478A1 (fr) * 1975-10-07 1979-04-13 France Etat Procede et dispositif pour retarder et/ou reduire les effets de la cavitation autour d'une surface portante hydrodynamique tronquee a l'arriere
US4188906A (en) * 1959-08-25 1980-02-19 Miller Marlin L Supercavitating propeller with air ventilation
GB2050278A (en) * 1979-06-06 1981-01-07 Crane Packing Co Flexible fluid conduit for propeller shaft

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188906A (en) * 1959-08-25 1980-02-19 Miller Marlin L Supercavitating propeller with air ventilation
FR2403478A1 (fr) * 1975-10-07 1979-04-13 France Etat Procede et dispositif pour retarder et/ou reduire les effets de la cavitation autour d'une surface portante hydrodynamique tronquee a l'arriere
GB2050278A (en) * 1979-06-06 1981-01-07 Crane Packing Co Flexible fluid conduit for propeller shaft

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MARINE ENGINEERS REVIEW, July 1972, pages 19-24, London, GB; H. MEIER-PETER: "Contra-rotating propulsion systems" *

Also Published As

Publication number Publication date
CA1254799A (fr) 1989-05-30
EP0175533A3 (en) 1986-08-27
EP0175533B1 (fr) 1988-12-14
DE3566791D1 (en) 1989-01-19

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