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Title:
TANGENTIAL DISCHARGE DISK REFINER
Document Type and Number:
WIPO Patent Application WO/2000/052255
Kind Code:
A2
Abstract:
A papermaking refiner (20) has two stationary disks (60, 64) mounted to the support structure of a fixed housing (34). A rotating disk (42) is mounted on a shaft (26) which extends through the housing. The support structure allows stock to circulate on both sides of the disk support structure, thus balancing fluid pressures on both sides of the fixed disk and preventing thermal gradients fo reduced deflection of the disks. The incoming stock is centrifugally accelerated in a shroud (46) which separates and traps tramp metal or the like before the stock passes to the refiner disks. The shroud has passageways (54) which allow the rotating fluid to enter a reservoir which surrounds the drive shaft and feeds the gaps between the rotor and the stationary plates.

Inventors:
LARIVIERE CHRISTOPHER
Application Number:
PCT/IB2000/000626
Publication Date:
September 08, 2000
Filing Date:
March 01, 2000
Export Citation:
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Assignee:
GROUPE LAPERRIERE & VERREAULT (CA)
International Classes:
B02C7/06; D21D1/30; (IPC1-7): D12D/
Foreign References:
US3841573A1974-10-15
US5707016A1998-01-13
FR1310340A1962-11-23
US5203514A1993-04-20
DE1104317B1961-04-06
GB757862A1956-09-26
US4783014A1988-11-08
EP0792689A11997-09-03
EP0412833A21991-02-13
Attorney, Agent or Firm:
Keneford, Brooke L. (1000-60 Queen Street Ottawa, Ontario K1P 5Y7, CA)
Download PDF:
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Claims:
CLAIMS Iclaim:
1. A twin disk refiner comprising: a housing having portions defining a stock inlet and portions defining a stock outlet downstream from the stock inlet; a shaft which extends into the housing and which supports a rotor for rotation within the housing, and wherein oppositely facing refining disks are mounted on the rotor; portions of the housing which define a first plate support structure through which the shaft extends; a first fixed refiner disk mounted to the first plate support structure; a second fixed refiner disk mounted to a second plate support structure; a refining chamber defined within the housing between the first plate support structure and the second plate support structure, wherein the rotor is position within the refining chamber so that rotation of the rotor moves the oppositely facing rotor desks about the shaft in refining relation to the first fixed refining disk and the second refining disk; and portions of the housing upstream of the refining chamber which define an upstream chamber in communication with the inlet, wherein the first plate support structure has an upstream face which is exposed to and substantially surrounded by the upstream chamber, such that fluid introduced into the housing at the inlet flows through the upstream chamber and then into the refining chamber, such that the first plate support structure is exposed to fluid pressure on its upstream face which counters the fluid pressure applied to the first fixed refiner disk within the refining chamber.
2. A disk refiner comprising: a machine frame; a shaft mounted for rotation on the machine frame and extending through a bulkhead into a refiner housing, a portion of the shaft extending into the refiner housing forming a spline; a first nonrotating refiner disk mounted to a stationary support structure forming part of the refiner housing; a second nonrotating refiner disk mounted on a sliding head in spaced parallel relation to the first nonrotating refiner disk for sliding motion towards the first nonrotating refiner disk; a rotor having a central hub, the hub slidably mounting the rotor on the portion of the shaft forming the spline, the rotor supporting a third refiner disk in spaced parallel refining relation with the first refining disk, and a fourth refining disk in spaced parallel refining relation to the second refining disk, the shaft transmitting rotating motion through the spline to the rotor; a stock inlet leading to a portion of the housing forming a circular flow path formed between an inner shell and an outer shell, the circular flow path for inducing stock to rotate about the shaft, the stock inlet being positioned so that gravity and centrifugal acceleration moves heavy weight tramp towards the outer shell; an outlet for heavy weight tramp located near a lowermost portion of the outer shell; at least one opening through the inner shell forming a means by which rotation motion of stock is preserved as the stock flows towards the rotor.
3. The refiner of Claim 1 wherein the stationary support structure forming part of the refiner housing forms part of the circular flow path so that hydraulic pressure due to the stock is presented to substantially all sides of the stationary support structure.
4. A pulp disk refiner comprising: a machine frame on which a shaft is mounted for rotation, the shaft being connected at a first end to a drive motor, and wherein a second end of the shaft passes into a refiner housing through a circular bulkhead, wherein the second shaft end is machined to form a spline to which a rotor is mounted; portions of a drive side of the refiner housing which define a stock inlet through which stock is supplie to a shroud, the shroud defining a passageway between an outer conical shell, an inner cylindrical structure and a drive side stationery plate support structure, the inner cylindrical structure surrounding the bulkhead, and wherein the shroud causes the stock to rotate producing an acceleration directed radially outwardly of the cylindrical structure, the passageway terminating at a baffle, thus causing the stock to pass through a plurality of holes in the inner cylindrical structure to enter a reservoir formed on the inside of the inside cylindrical structure surrounding the shaft, and wherein the circular path about which the stock is forced to flow separates tramp metal and other heavy weight tramp, throwing it radially outwardly against the outer conical shell, wherein the radial acceleration produced is not so great that it causes heavy weight tramp to travel upwardly along the conical shell into engagement with the baffle; a tramp outlet positioned near the lowermost portion of the shroud, and wherein rotary motion of the stock about the cylindrical structure persists as the flow passes through the holes so that the stock can flow through openings formed in the rotor with less resistance.
5. The refiner of Claim 4 wherein the shroud brings stock into engagement with a back side of the stationary plate support structure, said back side forming part of a triangular passageway, thus applying hydraulic support to the stationary plate support structure which allows the stationary plate support structure to be constructed of a substantially lighter weight structural section.
6. The refiner of Claim 4 wherein a movable stationery plate is mounted on a sliding head, and wherein the sliding head is mounted for translation toward and away from the rotor, the sliding head being mounted by a bearing ring to a removable door which forms part of the refiner housing, the sliding head being balance by a counterweight and driven by a mechanism which employs a variable frequency drive motor.
7. The refiner of Claim 4 wherein the rotor is mounted on a spline formed at the end of the shaft, and wherein the spline transmits rotary power to the rotor but is not affixed to the rotor, and wherein sufficient play between the rotor and the spline is provided so that the rotor slides along the spline, thus positioning the rotor in response to hydrodynamic forces between the stationary plate mounted on the support structure and the stationary plate mounted on the sliding head and a very small amount of tilting of the rotor with respect to the axis of the shaft is also accommodated by the spline hub mount.
8. The refiner of Claim 6 wherein sliding head supports the door side stationery plate on a support structure which allows stock to flow behind about thirty percent of the outer circumference of the support.
9. The refiner of Claim 4 wherein the passageway has a triangular crosssection.
10. The refiner of Claim 4 wherein all portions of the refiner which come into contact with the stock are constructed of stainless steel.
Description:
INTERNATIONALSEARCHREPORT Inter'onal Appilcatbn Nb PCl/IB00/00626 C.(Continuation)DOCUMENTSCONSIDEREDTOBERELEVANT CategoryCitation ofdocument,withindication,whereappropriate,oftherelevantpass agesRelevanttodaimNo. AGB757862A(THEBAUERBROS.COMPANY)1,4,8 thewholedocument AUS4783014A(FREDRIKSSONETAL)2,4,7 8November1988(1988-11-08) citedintheapplication thewholedocument AEP0792689A(AIKAWAIRONWORKSCO.)4,6 3September1997(1997-09-03) thewholedocument AEP0412833A(HAYBUSTERMANUFACTURING INC.)13February1991(1991-02-13) 1 INTERNATIONALSEARCHREPORT !...-------. , onneton on patsnt tamny mant>sra PCT/I B 00/00626 PatentdocumentPatentfamily Pubication citedin searchreportdatemember(s)date US3841573A15-10-1974DE2146547A22-03-1973 AT319728B10-01-1975 CA971018A15-07-1975 FR2152281A20-04-1973 GB1406816A17-09-1975 IT964369B21-01-1974 JP48048705A10-07-1973 JP55027197B18-07-1980 SE393646B16-05-1977 US5707016A13-01-1998NONE FR1310340A06-03-1963NONE US5203514A20-04-1993NONE DE1104317BNONE GB757862ANONE US4783014A08-11-1988WO8705061A27-08-1987 AU592554B18-01-1990 AU5544786A09-09-1987 BR8607252A06-12-1988 EP0288456A02-11-1988 IN167223A22-09-1990 EP792689A03-09-1997JP2758140B28-05-1998 JP8060579A05-03-1996 US5695135A09-12-1997 DE69606621D16-03-2000 DE69606621T21-06-2000 EP412833A13-02-1991US5011091A30-04-1991 AU634273B18-02-1993 AU6084990A14-02-1991 CA2009404A10-02-1991



 
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