EP1511896A1 - Roue helice pour malaxeurs de pate a papier - Google Patents

Roue helice pour malaxeurs de pate a papier

Info

Publication number
EP1511896A1
EP1511896A1 EP03730043A EP03730043A EP1511896A1 EP 1511896 A1 EP1511896 A1 EP 1511896A1 EP 03730043 A EP03730043 A EP 03730043A EP 03730043 A EP03730043 A EP 03730043A EP 1511896 A1 EP1511896 A1 EP 1511896A1
Authority
EP
European Patent Office
Prior art keywords
impeller
bottom flange
point
blades
ending section
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.)
Withdrawn
Application number
EP03730043A
Other languages
German (de)
English (en)
Inventor
Giancarlo Dal Maso
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.)
Comer Industries SpA
Original Assignee
Comer SpA
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 Comer SpA filed Critical Comer SpA
Publication of EP1511896A1 publication Critical patent/EP1511896A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • D21B1/347—Rotor assemblies

Definitions

  • This invention is about an impeller for paper pulp kneaders.
  • the action carried out by the kneader allows separating the cellulose fibres and making homogenous the water suspension of the same fibres.
  • Another important function of the kneader is that of separating the ink which soaks the cellulose fibres' paper so as to recover said fibres in order to remake new paper free of ink contamination.
  • the impeller of the kneader has a frustum conical shape with the major base placed on the. bottom of the tank and it is equipped with a number of blades cross-wound around a central vertical shaft which determines a longitudinal spin axis.
  • the impeller acts essentially as a pump which conveys the paper pulp towards the bottom through the channels formed between the blades and then makes it ascend continuously from the bottom upward along the walls of the tank, thus carrying out the pulping action.
  • the separation of the paper from the ink takes place because of the rubbing among adjacent cellulose fibres and such rubbing occurs with consecutive steps of the mixture through the same impeller.
  • the rubbing function is essential in order to achieve the intimate separation from fibre to fibre after a first phase of simple breaking of the paper into smaller pieces.
  • the state of the art impellers are of the multi-start type, usually equipped with three or more blades.
  • a state of the art kneader for paper pulps is described in the patent EP 0 775 233 registered under the name of the same applicant of this patent, and it exactly uses a triple-start impeller of a frustum conical shape, with a convergent taper towards the upper part of the tank which contains it.
  • the impeller which is used in the kneader described in the previously cited patent has however several inconveniences.
  • a first problem consists in that the treated material which descends along the channels among the blades, when it reaches the lower part of the impeller is radially ejected at high speed.
  • Another inconvenience consists in that the ending section of the channels defined among the blades of the impeller where the material's discharge takes place, they are not fully loaded by the mixture which tends to be dispersed due to the increase of the abovementioned radial velocity. It follows that the pressure, already high as a result of the abovementioned phenomenon, is concentrated in a limited area of the blades by causing their accentuated wear. This causes high pressure on the blades that besides involving also in this case a power loss, it also generates an accentuated wear of the same blades.
  • a further inconvenience consists in that on the lower ending section of the impeller, the blades have a sharp vertically.
  • a first object of the invention is that of making an impeller that would reduce the velocity of the mixture at the discharge from the channels next to the lower part of the same impeller.
  • an impeller for paper pulp kneaders that in line with the main claim, comprises:
  • each of said blades has an ending section, connected to said bottom flange, whose outer convex surface is defined by a plurality of points for each of them an ⁇ angle is being defined, which:
  • - has a width lower than 20°; - lays on a parallel plane or coincident with the plane defined by said bottom flange;
  • the ending section of the blade has an essentially triangular shape with an outer convex surface, slanting and upward divergent in accordance with a direction that forms a ⁇ angle greater than 30° with the longitudinal axis of the impeller.
  • the impeller of the invention allows a considerable saving on the used energy.
  • the impeller of the invention improves the volumetric performance of the kneader which is applied to because it reduces the reflux in the ending part of the impeller.
  • the impeller of the invention reduces also the specific pressure in proximity of the bottom of the blades thus improving its life.
  • FIG. 4 shows an isometric view of an operative embodiment of the impeller of the invention.
  • the impeller of the invention is shown through an isometric view in figures 1 and 2, where is generally indicated with 1.
  • the impeller comprises an essentially plan bottom flange 2, connectable to driving means by means of through holes 3 and equipped with a central shaft 4.
  • the central shaft 4 starts from the plane K defined by the bottom flange 2 and where blades 5 are cross-wound around it.
  • the central shaft 4 determines a longitudinal spin axis X of the impeller 1 which, in the case here described, has a frustum conical shape with the major base placed in the lower part and thus in proximity of the bottom of the container that holds it and that here is not shown.
  • impeller 1 is of the three-start type and thus is comprised of three blades as shown with greater details in figure 3.
  • connection of the impeller 1 to the driving means can also take place through different systems than the screw like means, in which case the bottom flange 2 will be free of holes 3.
  • the number of starts of the blades which make up the impeller can be whichever number and these blades can have any angle of inclination with respect to the user's needs.
  • each of said blades 5 has an ending section 6 which is connected to the bottom flange 2 and has the outer convex surface 7 which is defined by a number of points 8 for each of them an ⁇ angle is being defined, which: - has a width lower than 20°;
  • - is comprised between the tangent 9 to the contour of said outer convex surface 7 and the tangent 10 drawn to a circumference 11 having the center in said longitudinal axis X and passing through the point 8.
  • This situation advantageously includes an energy saving because the power that the motorized means provide for the impeller, can be transferred in greater amounts to the mixture to be treated with resulting considerable energy savings.
  • the ending section 6 of the blade 5 is delimited by the following: - a first point 12 that corresponds to the intersection between the outer edge 5a of the blade 5 and the outer edge 6a of the ending section 6 which have different inclinations among them; - a second point 13 that corresponds to the intersection between the outer edge 6a of the ending section 6 and the bottom flange 2; - a third point 14 that corresponds to the intersection between the curve 15 defined by the intersection of the ending section 6 with the bottom flange 2 and the vertical plane ⁇ which passes through the longitudinal axis X of the impeller and through the first point 12.
  • the mixture can more easily exit from the ending section 17 of the channel defined among the blades, because the possibility of an axial ascent of the mixture along the direction X is reduced and thus the possibility that it would overflow from the outer edge 6a by causing vorticity and mainly a power loss.
  • FIG 3 an embodiment of the invented impeller is shown, generally indicated with 20, which differs from the impeller illustrated and shown in figures 1 and 2, because it has, in proximity of the outer edge 5a of each blade 5, a containment tab 5b that is developed for a stretch of the length of each blade 5 starting from the central shaft 4.
  • the impeller of the invention shown in figures 1 and 3 is of the left-handed type and it develops the pulping action by rotating in the clockwise direction indicated by the arrow 18 in the figures 1 and 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

L'invention concerne une roue hélice (1, 20, 30) pour des malaxeurs de pâte à papier, qui comprend un plateau de fond sensiblement plan (2), une tige centrale (4) qui part du plan (K) défini par le plateau de fond (2) pour déterminer un axe de rotation longitudinal (X) de cette roue hélice (1), une ou plusieurs pales (5, 31) enroulées et croisées autour de la tige centrale (4). Chaque pale (5, 31) possède une section d'extrémité (6) reliée au plateau de fond (2), dont la surface convexe extérieure (7) est définie par un certain nombre de points (8) pour chacune d'elles, un angle (α) étant défini, lequel possède une largeur inférieure à 20°, se trouve sur un plan parallèle (TT) ou coïncide avec le plan (K) défini par le plateau de fond (2), est compris entre la tangente (9) du contour de la surface convexe extérieure (7) et la tangente (10) dessinée sur une circonférence (11) dont le centre se trouve dans l'axe longitudinal (X) et passe par le point (8).
EP03730043A 2002-05-17 2003-05-15 Roue helice pour malaxeurs de pate a papier Withdrawn EP1511896A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITVI20020097 ITVI20020097A1 (it) 2002-05-17 2002-05-17 Girante per spappolatori di paste cartacee
ITVI20020097 2002-05-17
PCT/EP2003/005093 WO2003097928A1 (fr) 2002-05-17 2003-05-15 Roue helice pour malaxeurs de pate a papier

Publications (1)

Publication Number Publication Date
EP1511896A1 true EP1511896A1 (fr) 2005-03-09

Family

ID=29434452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03730043A Withdrawn EP1511896A1 (fr) 2002-05-17 2003-05-15 Roue helice pour malaxeurs de pate a papier

Country Status (4)

Country Link
EP (1) EP1511896A1 (fr)
AU (1) AU2003240650A1 (fr)
IT (1) ITVI20020097A1 (fr)
WO (1) WO2003097928A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4535943A (en) * 1983-05-18 1985-08-20 The Black Clawson Company Pulping apparatus including a rotor and helical screw flights extending upwardly from the rotor
IT1280070B1 (it) * 1995-06-05 1997-12-29 Comer Spa Spappolatore per paste cartacee

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03097928A1 *

Also Published As

Publication number Publication date
AU2003240650A1 (en) 2003-12-02
ITVI20020097A1 (it) 2003-11-17
WO2003097928A1 (fr) 2003-11-27

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