US3438586A - Two-pipe disc refiner - Google Patents

Two-pipe disc refiner Download PDF

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Publication number
US3438586A
US3438586A US572424A US3438586DA US3438586A US 3438586 A US3438586 A US 3438586A US 572424 A US572424 A US 572424A US 3438586D A US3438586D A US 3438586DA US 3438586 A US3438586 A US 3438586A
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US
United States
Prior art keywords
disc
rotor
refining
stock
area
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
US572424A
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English (en)
Inventor
Vincent W Cancilla
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.)
Beloit Corp
Original Assignee
Beloit Corp
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 Beloit Corp filed Critical Beloit Corp
Application granted granted Critical
Publication of US3438586A publication Critical patent/US3438586A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills

Definitions

  • the present invention relates to improvements in refiners and more particularly to a refiner of the type which is used for refining paper pulp stock and particularly to a four-disc refiner.
  • a rotating disc In a four-disc stock refiner a rotating disc carries refining plates on its surfaces which face stationary refining discs. Stock is fed to the refiner at the center of the disc and flows outwardly between the stationary discs and the rotating disc.
  • a still further object of the invention is to provide a unique way of having a lower pressure on the outer face of the disc of a refiner than on the side having the driving shaft.
  • a still further object of the invention is to provide an improved four-disc refiner having a simplified piping arrangement wherein only one supply pipe may be used for the slurry inlet and one pipe used for the slurry outlet.
  • a still further object of the invention is to provide a four-disc refiner wherein the rotating discs can be serviced and inspected or changed without disconnecting pipes or fiow connections.
  • a feature of the present invention is the provision of a four-disc refiner with a refining rotating disc having inner and outer faces with annular refining surfaces thereon, a supporting shaft carrying the rotor disc at its end and projecting from the inner face of the disc, stationary relining surfaces in a housing facing the inner and outer surfaces of the rotor and defining first and second refining zones respectively with inner and outer rotor surfaces, a stock flow inlet passage leading to the first refining space along the shaft, and a second stock fiow passage preferably leading from the inlet passage through the rotor to the second refining space with the stock encountering a pressure drop through said passage so that lesser unit hydraulic pressure is felt on the outer face of the rotor disc and the overall axial forces on the disc are balanced.
  • FIGURE 1 is a schematic view shown in section of a refiner embodying the principles of the present invention.
  • FIGURE 2 is a detailed plan view of a rotor shown as it would appear along line II-II of FIGURE 1 with the shaft and other portions removed.
  • FIGURE 1 shows a refiner with a rotor disc 10.
  • the disc is relatively fiat and circular in shape as illustrated in FIGURE 2 and is provided with an inner face 10a and an outer face 10b.
  • annular refining surfaces 11 usually in the form of refining cutters or blades attached to the disc in a Amanner which will be appreciated by those versed in the art and need not be described in detail.
  • On the outer face 10b is an annular refining surface 12. Facing the refining surfaces 11 and 12 are stationary refining surfaces 13 and 14. These stationary annular surfaces are mounted in the inner chamber 22 of a housing 21 enclosing the refiner.
  • the space between the rotary refining surface 11 and the stationary refining ⁇ surface 13 forms a first refining zone 15.
  • the space between the refining surface 12 and the stationary refining surface 14 forms a second refining zone 16.
  • the inner refining surface 11 faces the first refining zone 15 and the outer refining surface 12 faces the second refining zone 16.
  • the rotor is carried and driven by a shaft 17 fioatingly supported in the housing and suitably carried on bearings and driven.
  • the mounting of the shaft will be fully understood -by those versed and need not be described in detail.
  • the shaft projects from the inner face 10a of the rotor and is suitably secured thereto with the shaft shown as admitted from the disc 10 in FIGURE 2.
  • Stock is fed to the refiner along the shaft 10 through an inlet passage 18.
  • the inlet passage is shown as extending annularly coaxially around the shaft 17 to supply stock 4uniformly to the first refining Zone 15.
  • a stock fiow passage is provided preferably in the form of flow ports 20 through the rotor.
  • the rotor is thus preferably made in spoked form and the stock flow passages have a predetermined size relationship to the inlet passage 18 in order to cause a predetermined pressure drop.
  • the outer face 10b of the rotor has an overall larger exposed -area than the inner face 10a inasmuch as the shaft 17 covers a portion of the exposed area.
  • the hydraulic pressure of the stock will act on a smaller area on the face 10a than on the face 10b.
  • the pressure of the stock on the face 10b is controlled to be of a reduced pressure.
  • This control is obtained by predetermining the size of the rotor inlet passages 20 so that predetermined pressure drop is obtained and the overall hydraulic force on the face 10b will be balanced or substantially the same as the overall hydraulic force on the face 10a.
  • the openings 20 have a size elationship to the inlet 18 so that a pressure drop of 0.4 to 0.6 p.s.i. occurs for every 10 p.s.i. of stock inlet pressure in the passage 18.
  • the preferred range of pressure drop across the rotor is in the range of .O4 to .06 ti-mes the inlet pressure.
  • Rotor Percent of Refiner size, Size inlet Area inlet Area rotor openings reqd area Area rotor Shaft AP factor inches pipe pipe openings area reqd, in rotor 50% inlet openings The following indicates the relationship between rotor area and disc area on the inner surface 10a of the disc with an example being given for a ZO-inch rener.
  • Z-pipe Duo Flo open area in hub 45 sq. in.
  • the housing can have a single inlet and single outlet pipe and servicing and inspection of the rotor can occur Without disconnection of lines.
  • a refining mechanism comprising in combination,
  • said passage means being of a size so that the total pressure drop of stock fiowing through said passage means is equal to the difference between the axial force of the stock on the inner face of the disc and the force of the stock on the outer face of the disc.
  • a refining mechanism in accordance with claim 1 including a -housing supporting said stationary refining surfaces with an outlet passage leading from said refining zone at the outer periphery of said disc.

Landscapes

  • Paper (AREA)
  • Crushing And Grinding (AREA)
  • Reciprocating Pumps (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Hydraulic Motors (AREA)
US572424A 1966-08-15 1966-08-15 Two-pipe disc refiner Expired - Lifetime US3438586A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US57242466A 1966-08-15 1966-08-15

Publications (1)

Publication Number Publication Date
US3438586A true US3438586A (en) 1969-04-15

Family

ID=24287749

Family Applications (1)

Application Number Title Priority Date Filing Date
US572424A Expired - Lifetime US3438586A (en) 1966-08-15 1966-08-15 Two-pipe disc refiner

Country Status (6)

Country Link
US (1) US3438586A (de)
DE (1) DE1561648C3 (de)
ES (1) ES343695A1 (de)
FI (1) FI44326C (de)
GB (1) GB1189215A (de)
SE (1) SE315792B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984057A (en) * 1975-01-15 1976-10-05 Milton Pilao Refiner for wood pulp or the like
US4036443A (en) * 1974-10-03 1977-07-19 Beloit Corporation Refiner head assembly and refining disk therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204057A (en) * 1937-06-15 1940-06-11 Swartz Paul Pulverizing mill
US2991020A (en) * 1960-04-29 1961-07-04 Ed Jones Corp Double-disk refiner
US3371873A (en) * 1966-03-24 1968-03-05 Keith V. Thomas Refining apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204057A (en) * 1937-06-15 1940-06-11 Swartz Paul Pulverizing mill
US2991020A (en) * 1960-04-29 1961-07-04 Ed Jones Corp Double-disk refiner
US3371873A (en) * 1966-03-24 1968-03-05 Keith V. Thomas Refining apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036443A (en) * 1974-10-03 1977-07-19 Beloit Corporation Refiner head assembly and refining disk therefor
US3984057A (en) * 1975-01-15 1976-10-05 Milton Pilao Refiner for wood pulp or the like

Also Published As

Publication number Publication date
SE315792B (de) 1969-10-06
DE1561648C3 (de) 1980-10-09
DE1561648A1 (de) 1971-10-21
FI44326C (fi) 1971-10-11
ES343695A1 (es) 1968-09-01
FI44326B (de) 1971-06-30
GB1189215A (en) 1970-04-22

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