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WO1998008990A1 - Appareil de degazage rotatif muni d'un accouplement de rotor a serrage entre le rotor et l'arbre d'entrainement - Google Patents

Appareil de degazage rotatif muni d'un accouplement de rotor a serrage entre le rotor et l'arbre d'entrainement Download PDF

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Publication number
WO1998008990A1
WO1998008990A1 PCT/GB1997/002269 GB9702269W WO9808990A1 WO 1998008990 A1 WO1998008990 A1 WO 1998008990A1 GB 9702269 W GB9702269 W GB 9702269W WO 9808990 A1 WO9808990 A1 WO 9808990A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
cap
drive shaft
coupling according
sleeve
Prior art date
Application number
PCT/GB1997/002269
Other languages
English (en)
Inventor
Kenneth John Allen
Original Assignee
Kenneth John Allen
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 Kenneth John Allen filed Critical Kenneth John Allen
Priority to AU40241/97A priority Critical patent/AU4024197A/en
Publication of WO1998008990A1 publication Critical patent/WO1998008990A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/064—Obtaining aluminium refining using inert or reactive gases
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
    • F16D1/04—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like with clamping hub; with hub and longitudinal key
    • F16D1/05—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • F16D1/09—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
    • F16D1/093—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping
    • F16D1/094—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping using one or more pairs of elastic or segmented rings with mutually mating conical surfaces, one of the mating rings being contracted and the other being expanded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material

Definitions

  • This invention relates to rotary degassing of metals, more 5 particularly, though not exclusively, aluminium and aluminium alloys.
  • degassing agent is usually an inert gas, such as nitrogen or argon, which is supplied through the rotor and bubbled through the melt, the rotation of the rotor breaking up the bubbles and dispersing them through the melt.
  • a decomposable solid form of degassing agent may be used which is carried 5 by the rotor and is stirred into the metal by the rotor as it decomposes.
  • the rotor is suspended from and rotated by a powered drive shaft of the machine.
  • the screw thread of the rotor quickly wears with use, requiring replacement of the rotor at frequent intervals in a continuous foundry process. Furthermore, unless the screw thread is accurately formed the 5 rotor will vibrate as it is rotated. Under the vibration the rotor will whirl around, increasingly further from, the rotational axis of the drive shaft.
  • a rotor coupling comprising a cap which is adapted to fit over an end of a graphite rotor and to be connected to a drive shaft of a rotary degassing machine to be rotated thereby, and which contains gripping means for retaining the rotor in the cap co-axially with the drive shaft.
  • the rotor coupling avoids the need for the rotor to be formed with a screw thread for interconnection with the drive shaft of a rotary degassing machine.
  • the coupling may connect to the rotor without special, or with minimal, forming of the rotor for the connection to be made.
  • a rotor of larger cross-section than has been usual may be connected by the coupling to the drive shaft, to provide a substantially longer useful operating life.
  • the cap of the coupling may be adapted to be screw-threadedly connected to a drive shaft in similar manner to the conventional connection of a rotor to a drive shaft.
  • the coupling may thus be connected to the usual form of drive shaft provided in rotary degassing machines.
  • the coupling may be adapted to be connected to other forms of
  • the cap may be made in one piece or it may be of a composite form. In the latter case it may comprise, for example, a body part which contains the gripping means and a head part which is attached to the body part and which is adapted to be connected to the drive shaft of a rotary degassing machine.
  • the head part may be adapted to fit different drive shafts or it may be replaceable by one or more other head parts to suit different drive shafts .
  • the head part may therefore serve as a means of adapting the cap for connection to drive shafts of various kinds and sizes.
  • the gripping means clamps about the end of the rotor to grip the end all around its periphery.
  • the gripping means may comprise a sleeve which fits around the end of the rotor and has a tapered external surface which co-operates with a complementary surface of the cap, or of a member or members retained to the cap, whereby the sleeve is urged into gripping engagement with the end of the rotor by relative axial movement between the sleeve and the cap.
  • the sleeve is longitudinally slotted and fits as a collet co-axially inside a further, outer, sleeve, which may also be longitudinally slotted, retained to the cap which has an internal tapering surface complementary to and engaged by the tapered external surface of the inner sleeve.
  • the two sleeves are connected to the cap by screw means which, when tightened, urges the sleeves together to clamp the inner sleeve onto the rotor.
  • the screw means may comprise screws or bolts which extend parallel to the common axis of the sleeves.
  • Means may be provided to restrict the extent by which the two sleeves can be urged together.
  • a setting ring may be provided between a flange of the inner sleeve and an opposed abutment face of the cap which restricts axial movement between the sleeve in the clamping direction of the inner sleeve.
  • Retention means may be made for holding the rotor to the cap when the gripping means is not applied for retaining the rotor in the cap, for example for initial location of the rotor in the cap or retention of the rotor to the cap while the gripping means is released prior to removal of the rotor from the cap.
  • a pin or pins, or the like may be provided for the purpose insertable laterally of the rotor into a location or locations, such as a hole or holes, recess or groove, in the rotor through a locating aperture or apertures in the cap.
  • Suitable restraint means is preferably included on the cap for preventing unintentional release of the pin or pins from the rotor.
  • a collar may be mounted on the cap which is movable relative to the cap between operative and inoperative positions. In the operative position the collar overlaps an outer end of the or each pin to prevent withdrawal of the pin or pins from the location or locations in the rotor, and in the inoperative position the collar is moved clear of the pin or pins so as to allow its or their withdrawal from the location or locations for release of the rotor from the cap.
  • a keeper device may be provided which clamps to the cap and is, or has a part or parts applied to it, adapted to engage with an annular groove in the rotor to retain the rotor in the cap. The keeper device may be in two or more component parts which fit together around the rotor to be clamped to the cap.
  • the rotor coupling may be used in combination with a rotor as supplied in production form and/or with a rotor which has been attached directly to a drive shaft of a rotary degassing machine, in the conventional way.
  • a used rotor which has had a worn or broken screw-threaded connection to a drive shaft may provide further useful service by being fitted with a rotor coupling in accordance with the present invention and then connected to a drive shaft by the coupling.
  • an assembly comprising a graphite rotor and a rotor coupling in accordance with the foregoing first aspect of the invention to which the rotor is removably connected.
  • the rotor may be of generally cylindrical rod form, conveniently made from extruded stock. It may alternatively be made of square or other non-circular cross-section to assist in the stirring action in a melt.
  • One end of the rotor to which the rotor coupling is fitted may be reduced in cross-section.
  • the opposite end of the rotor may be enlarged, or have an enlarged end part connected to it to enhance the stirring action of the rotor in use.
  • the enlarged end or end part may be castellated, ribbed or otherwise suitably formed to induce turbulence in the stirring of the melt. It may be reinforced to increase its resistance to wear from the stirring action.
  • the coupling and rotor may be adapted for a degassing gas, such as nitrogen or argon, to be introduced into a melt.
  • a degassing gas such as nitrogen or argon
  • communicating gas passages may be provided in the cap and rotor which, when the coupling is attached to a drive shaft of a rotary degassing machine, connect to a gas supply delivered to the drive shaft.
  • the rotor may be adapted to have a degassing agent of a decomposable solid form attached to it. Flux may be added to a melt in combination with a gaseous or solid form of degassing agent.
  • a rotary degassing machine having a powered drive shaft and an assembly in accordance with the foregoing second aspect of the invention detachably connected to the drive shaft by the rotor coupling.
  • Figure 1 is enlarged axial sectional view through a first embodiment of a rotor coupling in accordance with the foregoing first aspect of the invention to which a graphite rotor is attached;
  • Figure 2 is an axial section through an enlarged end part of the rotor;
  • Figure 3 is a side view of a rotary degassing machine fitted with the rotor coupling and rotor;
  • Figure 4 is a simplified axial sectional view through a second embodiment of a rotor coupling in accordance with the first aspect of the invention.
  • Figures 5 and 6 are an axial cross-section and an underneath plan view of another form of enlarged end part of a rotor.
  • a rotor coupling 1 which comprises a cap 2, a pair of co-operating inner and outer sleeves 3 and 4 respectively, which constitute gripping means in the cap, locating pins 5, a sliding collar 6 and a setting ring 7.
  • the cap 2 comprises a circular crown 8, having a co-axial tubular part 9, and a co-axial cylindrical skirt 10.
  • the cap 2 is made in one piece of machine-formed suitable metal.
  • An internal screw thread 11 is formed in the bore of the tubular part 9 to be complementary to an external screw-threaded lower end 13 of a vertically disposed, conventional, powered drive shaft 12 of a rotary degassing machine.
  • the screw thread 11 is of acme form.
  • a sealing O-ring 14 is located in an angular groove 15 in an upper end face 16 of the tubular part 9 for gas tight sealing engagement with an annular flange 17 of the spindle 12 above the screw-threaded lower end 13.
  • An annular rib 18 around the exterior of the skirt 10 locates the sliding collar 6 on the cap around the skirt.
  • the cap may be made, for example, of steel or aluminium.
  • the inner and outer sleeves 3, 4 fit co-axially into the skirt 10 of the cap, the inner sleeve 3 being telescoped inside the outer sleeve 4 and the two sleeves each having a longitudinal slot, not shown, along the side so as to be of a collet form.
  • the sleeves may be made of steel.
  • Each sleeve has an annular external flange, 19, 20 respectively, at its lower end.
  • the inner sleeve 3 has a cylindrical bore 21 of constant diameter and an external surface 22 which tapers upwardly from the flange 19 of that sleeve.
  • the outer sleeve 4 has an upwardly tapering bore 23 complementary to the tapered external surface 22 of the inner sleeve 3, and extending from the flange 20 a cylindrical external surface 23' which is a sliding push fit into the skirt 10.
  • internally screw-threaded, blind bore, holes 26 are formed in the bottom edge face of the skirt. Locking screws 27 extend through the plain bore holes 24, 25 and tighten into the screw-threaded holes 26 to urge the inner sleeve axially into the outer sleeve.
  • the flange 20 of the outer sleeve seats on the bottom edge face of the skirt 10 and is of a smaller external diameter than the flange 19 of the inner Sleeve.
  • Setting ring 7, which is tubular, is fitted between the flange 19 of the inner sleeve and the bottom edge ⁇ ace ⁇ of the skirt, the flange 20 of the outer sleeve being a free fit inside the setting ring.
  • the setting ring 7 spaces the flanges of the two sleeves apart. It limits the extent by which the inner sleeve can be urged into the outer sleeve by the locking screws 27.
  • Release screws 28 which have screw-threaded engagement in holes 29 in the flange 19 of the inner sleeve 3 extend at reduced inner portions 30 through plain bore holes 31 in the flange 20 of the outer sleeve and into plain bore blind holes 32 in the bottom edge face of the skirt. By turning the release screws the inner sleeve 3 can be urged axially outwardly of the outer sleeve.
  • Locating pins 5 are headed and extend radially of the skirt 10 slidably through plain holes 33 in the skirt below the rib 18, and, with clearance, through aligned plain holes 34, 35 in the outer and inner sleeves. When fully pushed into the holes their heads abut against the exterior of the skirt and are contained substantially within the outward projection of the rib 18 from the general external surface of the skirt.
  • the sliding collar 6 normally occupies an operative position, as shown in Figure 1 , to which it is urged by gravity and in which it extends down past the heads of the fully pushed in locating pins to prevent withdrawal of the pins.
  • An internal bead 36 at the upper end of the collar 6 bears on the upper edge of the rib 18 to define the limit of downward sliding of the collar on the skirt. The collar can simply be lifted above the level of the locating pins when it is required to withdraw them.
  • the coupling is designed to be used with a graphite rotor 37 which has a plain cylindrical upper end 38.
  • the main body of the rotor 37 may be of cylindrical rod form, or it may be of a non-circular, for example square, cross-section. It may be formed, as is usual, from a length of extruded graphite stock.
  • Bore 21 of the inner sleeve 3 is of a diameter to receive the upper end 38 of the rotor 37 as a close sliding fit.
  • a gas feed passage 39 extends axially through the rotor and has an enlarged inlet 40 adjacent to the top of the upper end 38 of the rotor. Sealing O-rings 41 are located in annular grooves 42 in the inlet 40.
  • Gas supplied axially through the drive shaft 12 to which the coupling is connected for use enters the gas feed passage 39 of the rotor through a nozzle 60 which locates, and is sealed by the O-rings 41 , in the inlet 40.
  • a sealing O- ring 43 is also located in an annular groove 44 formed concentrically in the end face 45 of the upper end 38.
  • Blind radial holes 46 are formed in the upper end, positioned to receive the locating pins 5.
  • the rotor 37 is fitted with an enlarged end part 47, also of graphite, to promote the stirring action of the rotor.
  • the end part 47 screws onto a reduced diameter, externally screw-threaded, end section 48 of the rotor. It may take various forms. In the form as illustrated in Figure 2, the end part 47 has radial castellations 49 formed on its underside.
  • the locking screws 27 are first slackened off so that the inner sleeve 3 is a loose fit in the outer sleeve.
  • the locating pins 5 are withdrawn.
  • the upper end 38 of the rotor is then inserted into the bore 21 of the inner sleeve, the upper end being of a length to protrude through the sleeve for its end face 45 to abut against the underside of the crown 8 and be sealed thereto by O-ring 43.
  • the locating pins are inserted in the holes 33 of the skirt and pushed through the aligned holes 34, 35 of the outer and inner sleeves to engage in the radial holes 46 in the upper end of the rotor.
  • the rotor is thus loosely retained to the coupling by the locating pins which are then prevented from withdrawal by dropping the sliding collar 6 into its operative position.
  • the locking screws 27 are tightened so as to urge the inner sleeve tightly into the outer sleeve, which action, by the engagement of the tapering external surface 22 of the inner sleeve in the tapering bore 23 of the outer sleeve, causes the inner sleeve to compress onto the outer end of the rotor and grip it firmly, and centrally, in the coupling.
  • the setting ring 7 prevents over compression of the outer end.
  • the rotor When the coupling has been secured, the rotor is connected to the drive shaft 12 of a rotary degassing machine by securing the tubular part 9 of the cap 2 onto the screw-threaded lower end 13 of the drive shaft.
  • the tubular part 9 is screwed until its upper end face 16 abuts against the annular flange 17 of the drive shaft and the O-ring 14 seals on the flange.
  • the nozzle 60 at the drive shaft engages in the inlet 40 of the gas feed passage 39 in the rotor and is sealed therein by the O-rings 41.
  • Connection of the rotor and a drive shaft could also be achieved by cutting the tubular part 9 of the cap 2 to a required size, and forming an acme thread on the outer surface thereof.
  • the size and thread of the part 9 are such that the rotor may be located within a portion of the drive shaft, and the rotor and drive shaft connected by means of the thread on the part 9 and a corresponding thread on the drive shaft.
  • the rotary degassing machine may be of a known form. It may, for example, be a mobile unit as shown in Figure 3 mounted on a trolley 50. In such a machine the drive shaft 12, carried by an arm 51, is powered by a battery driven motor 52 connected to the drive shaft through a belt drive 53. Gas is supplied to the drive shaft from a gas cylinder 54 supported on the trolley 50.
  • a mains driven rotary degassing machine may be used, as may an overhead, possibly travelling, machine.
  • the rotor may be readily replaced when it becomes worn with use.
  • the release screws 28 enable the inner sleeve 3 to be eased axially out of the outer sleeve 4 to relieve the clamping action of the inner sleeve on the upper end of the worn rotor.
  • a rotor originally designed to be screwed directly onto the drive shaft of a degassing machine may be fitted to the coupling if the screw-threaded end of such a rotor is removed, or has been broken away.
  • the coupling may be made in various sizes to suit a range of rotor sizes.
  • Inner sleeves of different bore sizes may be provided for adapting the coupling for fitting to rotors of various cross-sectional sizes.
  • Different setting rings may also be provided for varying the extent by which the inner sleeve can be urged onto the outer sleeve to suit different rotors.
  • the annular rib 18 on the cap 2 may be omitted, and the heads of the pins 5 recessed into the skirt 10 of the cap.
  • the sliding collar 6 may be provided with an annular lip which extends radially inwards from the upper end of the collar. The collar is then held in an operative position adjacent the outer surface of the skirt 10 and covering the heads of the pins, by abutment of the lip on the shoulder formed between the tubular part 9 and the skirt 10 of the cap 2.
  • Additional or alternative means for holding the rotor to the coupling may be provided.
  • This may comprise a ring located, for example, in the inner sleeve 3 preferably near the lower end thereof.
  • the ring may be provided in a number of segments, for example 3 or 4.
  • Pins are located at various points around the ring, and in a normal operating position are forced radially inwards, for example by a spring, so that they protrude through the inner surface of the inner sleeve into the bore 21 thereof.
  • the pins are forced radially outwards so that the rotor may be fully inserted into the bore.
  • the pins of the ring are aligned with an annular groove provided on the rotor, and the pins are forced radially inwards to locate in the groove.
  • the rotor is thus held to the coupling.
  • Means may be provided to retract the pins so that the rotor may be removed.
  • This holding means may be used separately from or in addition to the pins 5 described above. Should the locking screws 27 be overtightened, crushing the upper end of the rotor and impairing the action of the pins 5 and/or the gripping means, this holding means will ensure that the rotor will remain attached to the coupling. The safety of the coupling is therefore enhanced.
  • the rotor coupling 1 again comprises a cap 2, a pair of co-operating inner and outer sleeves 3 and 4 respectively, forming gripping means in the cap, and a setting ring.
  • the cap 1 instead of being in one piece as in the first embodiment, is made in two parts: a body part 60 and a head part 61.
  • the two parts 60, 61 of the cap may be made, for example, of steel or aluminium.
  • the body part 60 is tubular and substantially similar to the cylindrical skirt 10 of the cap in the first embodiment except that it does not have the annular rib 18 or the plain holes 33.
  • external annular cooling fins 62 It is formed with external annular cooling fins 62, has a number of equi-angularly spaced, plain-bore holes 63 extending though it parallel to its central longitudinal axis, and equi-angularly spaced, internally screw-threaded, blind holes 64 extending into it, also parallel to the central longitudinal axis, from a flat upper face 65 of the body part 60.
  • the plain-bore holes 63 are countersunk, 66, at the upper face 65.
  • the head part 61 of the cap has a circular crown 8 and co-axial tubular part 9, generally similar to those of the cap in the first embodiment, the crown 8 fitting over the upper face 65 of the body part 60 to close off the top the body part and the tubular part 9 having an internal screw thread 11 for engagement with the externally screw-threaded lower end 13 of a powered drive shaft 12 of a rotary degassing machine.
  • the tubular part may be otherwise suitably adapted for connection to a drive shaft.
  • the plain-bore holes there may be key-hole slots in the crown 8 with which the studs 68 engage for quick fitting and removal of the head part 6 to and " from tne body part without detaching the retaining nuts 69 from the studs.
  • Inner and outer sleeves 3, 4 in this second embodiment are essentially the same as those in the first embodiment, being slotted along their sides as collets and having flanges 19, 20 containing plain bore through holes 24, 25, and will not be further described.
  • the plain-bore through holes 25 in the flange 20 of the outer sleeve 4 may be replaced by recesses in the flange opening to the edge of the flange.
  • One or more grub-screws 70 are provided for urging the inner and outer sleeves axially apart at their flanges 19, 20 when the sleeves are required to be separated.
  • a screw or screws 84 may be applied at the flange 20 of the outer sleeve 4 to attach that sleeve to the bottom of the body part 60, and a screw or screws 85 may be applied at the flange 19 of the inner sleeve to attach the inner sleeve to the flange 20 of the outer sleeve.
  • a keeper ring 71 Used in combination with the cap is a keeper ring 71 which is in two equal halves designed to fit around the rotor.
  • the made-up keeper ring 71 which may be made, for example, of steel or aluminium, forms an annulus, of larger external diameter than the flanges 19, 20 of the inner and outer sleeves 3, 4, having an inner circular edge 72 and has internally screw-threaded blind holes 73 opening through an upper face 74 corresponding in number and positions to, so as to register with, the plain-bore holes 63 in the body part 60 of the cap 2.
  • the blind holes 73 extend into bosses 75 formed on the underside of the keeper ring.
  • the rotor 37 to be clamped is formed with a peripheral groove 76 around its upper end and the two halves of the keeper ring 71 fit around the upper end so that the inner circular edge 72 engages in the groove.
  • the keeper ring is retained to the inner and outer sleeves which in turn are retained with the keeper ring to the cap by means of bolts 77 which are passed down through the plain-bore holes 63 of the body part 60 of the cap, through the plain bore through holes 24, 25 of the flanges 19, 20 of the inner and outer sleeves and tightened into the threaded blind holes 73 of the keeper ring.
  • bolts 77 For the insertion and securing of the bolts 77 the body and head parts 60, 61 of the cap are separated.
  • the bolts 77 have socket heads 78 which are received into the countersunk ends 66 of the plain-bore holes 63 so as to lie below the upper face 65 of the body part when the bolts have been secured.
  • the head part 61 of the cap is removed from the body part 60, the bolts 77 are disconnected from the keeper ring and the inner sleeve 3 is loosely fitted in the outer sleeve.
  • the rotor 37 which has an axial gas feed passage 39 extending through it and a shallow central recess 79 in its upper end face fitted with a sealing washer 80 of high temperature, closed-pore, foam, is inserted into the bore 21 of the upper sleeve until its upper end face is spaced just below the level of the upper face 65 of the body part 60.
  • a sealing washer 80 of high temperature, closed-pore, foam is inserted into the bore 21 of the upper sleeve until its upper end face is spaced just below the level of the upper face 65 of the body part 60.
  • the two halves of the keeper ring 71 are then fitted around the rotor with its inner circular edge 72 engaging in the groove 76 and the threaded blind holes 73 in register with the plain bore holes 24, 25 of the flanges 19, 20.
  • the bolts 77 engaged in the plain-bore holes 63 of the body part 60 and the plain bore holes 24, 25 of the flanges 19, 20, are tightened into the blind holes 73 of the keeper ring. Tightening of the bolts 77 causes the rotor to be urged upwards in the inner sleeve by the interengagement of the keeper ring and groove 76, and also urges the inner sleeve tightly into the outer sleeve. In consequence the inner sleeve is compressed by the interaction of the tapering external surface 22 of the inner sleeve in the tapering bore 23 of the outer sleeve into compressive engagement with the rotor so as to grip the rotor firmly, and centrally, in the cap.
  • the head part 61 of the cap is secured on the body part 60 by means of the studs 68 and retaining nuts 69.
  • the foam sealing washer 80 in the recess 79 in the upper end of the rotor becomes compressed to seal the head and body parts together around the gas feed passage 39 of the rotor.
  • the head part 61 covers over the heads of the bolts.
  • the rotor is connected to the drive shaft 12 of a rotary degassing machine by securing the tubular part 9 of the head part of the cap 2 onto the screw-threaded lower end 13 of the drive shaft, a before.
  • the head part 61 of the cap may be interchangeable with other head parts for fitting to the body part to suit the connection of the coupling to drive shafts of different forms and sizes.
  • the rotor 37 may have or be fitted with an enlarged end part 47, also of graphite, to promote the stirring action of the rotor.
  • the enlarged end part may take the form of that shown in Figure 2 or other forms.
  • An example of another form is shown in Figures 4 and 5 of the drawings.
  • the end part 47 is of square shape in plan with oblor. downward projections 81 on its underside. There is one projection adjacent each side of the end part. Each projection 81 extends approximately halfway along the respective side edge from one end of the edge, leaving a gap 82 at the side edge between the end of the projection and the adjacent end of the projection at the next side edge of the end part.
  • Each gap 82 is towards what is the leading edge of the side of the square shape of the end part when the rotor is rotated in use.
  • Gas supplied down the axial passage 39 of the rotor passes through an axial hole 83 in the end part into the space contained by the projections 81 and is then dispersed though the gaps 82 as the rotor turns.
  • the projections turning through the paths of the gas as the gas passes out of the gaps assists in breaking up the bubbles in the gas flow for better dispersion of the gas through the melt in which the rotor is used.
  • the stirring action of the rotor in the melt causes wear of the enlarged end part.
  • plates of hard-wearing material for example titanium, may be applied over the projections 81.
  • Another possibility is to have the projections, or at least leading portions of them made of a more hard-wearing graphite than the rest of the end part.
  • Yet a further way of reducing the rate of wear is to have the end part of a material which is more hard-wearing than graphite, for example a ceramic material, or a composite of graphite and another hard wearing material or materials.

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  • Centrifugal Separators (AREA)

Abstract

La présente invention se rapporte à un accouplement (1) de rotor permettant d'accoupler un rotor (37) en graphite à l'arbre d'entraînement (12) d'une machine de dégazage rotative. Ledit accouplement comprend un couvercle (2) se plaçant à une extrémité du rotor et des moyens de serrage (3, 4) permettant de retenir le rotor dans le couvercle. Cette structure permet d'éviter les interconnexions filetées entre le rotor et l'arbre d'entraînement, lesquelles s'usent rapidement et nécessitent la formation d'un filetage sur le rotor, et augmente de la sorte le coût de fabrication. Le rotor ne requiert pas de traitement particulier, ou un traitement minimal, pour pouvoir être maintenu par les moyens de serrage. Ces moyens de serrage peuvent maintenir un rotor qui a déjà été utilisé et dont le filetage est usé ou défectueux, ce qui permet ainsi de prolonger sa durée de vie utile. Les moyens de serrage comprennent, de préférence, deux manchons (3, 4) formant douilles de serrage, lesquels s'imbriquent l'un dans l'autre à l'intérieur du couvercle et sont munis de surfaces biseautées complémentaires (22, 23) qui coopèrent, au moyen de vis ou de boulons (27), lorsque les manchons sont soumis à un déplacement axial relatif l'un par rapport à l'autre, ceci de manière que le manchon intérieur (3) est comprimé autour du rotor et serre celui-ci contre le couvercle.
PCT/GB1997/002269 1996-08-31 1997-08-26 Appareil de degazage rotatif muni d'un accouplement de rotor a serrage entre le rotor et l'arbre d'entrainement WO1998008990A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU40241/97A AU4024197A (en) 1996-08-31 1997-08-26 Rotary degassing apparatus with rotor grip coupling between impeller rotor and drive shaft

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9618244.9A GB9618244D0 (en) 1996-08-31 1996-08-31 Improvements relating to rotary degassing of metals
GB9618244.9 1996-08-31

Publications (1)

Publication Number Publication Date
WO1998008990A1 true WO1998008990A1 (fr) 1998-03-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002269 WO1998008990A1 (fr) 1996-08-31 1997-08-26 Appareil de degazage rotatif muni d'un accouplement de rotor a serrage entre le rotor et l'arbre d'entrainement

Country Status (3)

Country Link
AU (1) AU4024197A (fr)
GB (3) GB9618244D0 (fr)
WO (1) WO1998008990A1 (fr)

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Publication number Priority date Publication date Assignee Title
WO2000036315A1 (fr) * 1998-12-15 2000-06-22 MÜLLENBERG, Elisabeth Systeme de serrage
US6827820B1 (en) * 1999-06-03 2004-12-07 Pom Technology Oy Ab Degassing centrifugal apparatus, process for pumping and degassing a fluid and process for producing paper or board
US7731891B2 (en) * 2002-07-12 2010-06-08 Cooper Paul V Couplings for molten metal devices
US7947112B1 (en) 2007-07-16 2011-05-24 Rheodyne, Llc Method for degassing a fluid
US9011761B2 (en) 2013-03-14 2015-04-21 Paul V. Cooper Ladle with transfer conduit
US9017597B2 (en) 2007-06-21 2015-04-28 Paul V. Cooper Transferring molten metal using non-gravity assist launder
US9034244B2 (en) 2002-07-12 2015-05-19 Paul V. Cooper Gas-transfer foot
US9080577B2 (en) 2009-08-07 2015-07-14 Paul V. Cooper Shaft and post tensioning device
US9156087B2 (en) 2007-06-21 2015-10-13 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
US9205490B2 (en) 2007-06-21 2015-12-08 Molten Metal Equipment Innovations, Llc Transfer well system and method for making same
US9328615B2 (en) 2009-08-07 2016-05-03 Molten Metal Equipment Innovations, Llc Rotary degassers and components therefor
US9382599B2 (en) 2009-08-07 2016-07-05 Molten Metal Equipment Innovations, Llc Rotary degasser and rotor therefor
US9409232B2 (en) 2007-06-21 2016-08-09 Molten Metal Equipment Innovations, Llc Molten metal transfer vessel and method of construction
US9410744B2 (en) 2010-05-12 2016-08-09 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9643247B2 (en) 2007-06-21 2017-05-09 Molten Metal Equipment Innovations, Llc Molten metal transfer and degassing system
US9903383B2 (en) 2013-03-13 2018-02-27 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened top
US9909808B2 (en) 2007-06-21 2018-03-06 Molten Metal Equipment Innovations, Llc System and method for degassing molten metal
US10052688B2 (en) 2013-03-15 2018-08-21 Molten Metal Equipment Innovations, Llc Transfer pump launder system
US10138892B2 (en) 2014-07-02 2018-11-27 Molten Metal Equipment Innovations, Llc Rotor and rotor shaft for molten metal
JP2019000864A (ja) * 2017-06-14 2019-01-10 トヨタ車体株式会社 金型駆動用の連結機構
US10267314B2 (en) 2016-01-13 2019-04-23 Molten Metal Equipment Innovations, Llc Tensioned support shaft and other molten metal devices
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US10428821B2 (en) 2009-08-07 2019-10-01 Molten Metal Equipment Innovations, Llc Quick submergence molten metal pump
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US11149747B2 (en) 2017-11-17 2021-10-19 Molten Metal Equipment Innovations, Llc Tensioned support post and other molten metal devices
CN114540655A (zh) * 2022-02-16 2022-05-27 柳州职业技术学院 一种铝合金精炼用石墨转子与石墨转轴密封结构的制备装配工艺
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US9034244B2 (en) 2002-07-12 2015-05-19 Paul V. Cooper Gas-transfer foot
US7731891B2 (en) * 2002-07-12 2010-06-08 Cooper Paul V Couplings for molten metal devices
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Also Published As

Publication number Publication date
GB9618244D0 (en) 1996-10-09
GB9718739D0 (en) 1998-04-08
GB2318404A (en) 1998-04-22
AU4024197A (en) 1998-03-19

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