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WO2017209678A1 - Unité de mélangeur à utiliser dans un appareil de mélange, et appareil de mélange comprenant une telle unité de mélangeur - Google Patents

Unité de mélangeur à utiliser dans un appareil de mélange, et appareil de mélange comprenant une telle unité de mélangeur Download PDF

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Publication number
WO2017209678A1
WO2017209678A1 PCT/SE2017/050546 SE2017050546W WO2017209678A1 WO 2017209678 A1 WO2017209678 A1 WO 2017209678A1 SE 2017050546 W SE2017050546 W SE 2017050546W WO 2017209678 A1 WO2017209678 A1 WO 2017209678A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
mixing
mixing unit
stator
unit according
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.)
Ceased
Application number
PCT/SE2017/050546
Other languages
English (en)
Inventor
Leif ÖDMARK
Mikael Löfgren
Niklas Eriksson
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.)
Valmet Technologies Oy
Valmet AB
Original Assignee
Valmet Oy
Valmet AB
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 Valmet Oy, Valmet AB filed Critical Valmet Oy
Publication of WO2017209678A1 publication Critical patent/WO2017209678A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/272—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
    • B01F27/2721—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces provided with intermeshing elements
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/17—Stirrers with additional elements mounted on the stirrer, for purposes other than mixing
    • B01F27/171—Stirrers with additional elements mounted on the stirrer, for purposes other than mixing for disintegrating, e.g. for milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/272—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
    • B01F27/2722—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces provided with ribs, ridges or grooves on one surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/707—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms the paddles co-operating, e.g. intermeshing, with elements on the receptacle wall
    • 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
    • D21B1/342—Mixing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/222—Use of compounds accelerating the pulping processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/47—Mixing of ingredients for making paper pulp, e.g. wood fibres or wood pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor

Definitions

  • the invention relates to a mixing unit for use in a mixing apparatus for mixing treatment media into a fiber suspension, e.g. a lignocellulosic pulp suspension.
  • the invention further relates to such a mixing apparatus.
  • the treatment media added into the fiber suspension may for example be for heating, delignification or bleaching purposes.
  • the treatment media may be in liquid or gaseous state.
  • WO2013/089615 discloses a mixing unit and a mixing apparatus comprising at least two rotor bodies arranged on a rotor shaft in an axially separated manner with a stator body placed between the rotor bodies.
  • An object of the invention is to provide an improved unit for mixing for use in a mixing apparatus.
  • a second object is to provide an improved mixing apparatus.
  • a mixing unit for use in a mixing apparatus for mixing treatment media in liquid or gaseous state with a fiber suspension, which apparatus comprises a housing defining a mixing chamber, at least one inlet for feeding a fiber suspension and treatment media into the mixing chamber, a drive shaft connectable to a drive device for rotation of the drive shaft in operation, and an outlet for discharging the mixture of fiber suspension and treatment media.
  • the mixing unit is adapted to be arranged in the mixing chamber and comprises at least one rotor, each rotor being adapted to be connected to the drive shaft to rotate with the drive shaft in a direction of rotation, each rotor comprising at least one radially extending rotor arm.
  • a trailing surface of the at least one rotor arm is at least partially provided with a plurality of recesses.
  • each rotor is connectable to the drive shaft by means of for example a rotor shaft forming a part of said rotor, and each rotor comprises one or more rotor arms or bars which extend radially from the rotor shaft.
  • the rotor arms or bars may be described as elongated since they may have a length which is substantially longer than their width.
  • the one or more rotor arms do not necessarily extend only in a radial direction, but may in embodiments also extend in the tangential direction such that the rotor arm(s) or the leading surface(s) thereof, either as a whole or at least a portion thereof, is angled or curved in the direction of rotation (as seen from the center of the rotor).
  • the leading surface may be arranged at positive angle relative a thought radial line and in the direction of rotation.
  • the thought radial line refers to an imaginary line which extends straight in the radial direction from the center of the rotor to its circumference.
  • the one or more rotor arms may be angled or curved in the direction of rotation such that a radially outer end of the leading surface is positioned ahead of an inner end of the leading surface in the rotational direction.
  • the trailing surface of the at least one rotor arm may alternatively be described as being provided with a plurality of recesses along at least a portion of its radial extension or along at least a portion of its length. The recesses may, but do not necessarily need to, extend through the whole axial width or thickness of the at least one rotor arm.
  • the mixing unit further comprises at least one stator, each stator being arranged axially adjacent at least one rotor.
  • Each stator comprises at least one radially extending stator arm.
  • a rear surface of the at least one stator arm may be at least partially provided with a plurality of recesses.
  • the stator arms or bars may be described as elongated since they may have a length which is substantially longer than their width.
  • the stator arms do not necessarily extend only in a radial direction, but may in embodiments also extend in the tangential direction such that the stator arm(s) or the front surface(s) thereof, either as a whole or at least a portion thereof, is angled or curved against or opposite the direction of rotation (as seen from the center of the stator).
  • the front surface may be disposed at a positive angle relative a thought radial line and against the direction of rotation.
  • the thought radial line refers to an imaginary line which extends straight in the radial direction from the center of the stator to its circumference.
  • the one or more stator arms may be angled or curved in the direction of rotation such that a radially inner end of the front surface is positioned ahead of an outer end of the front surface in the rotational direction. In other embodiments, the stator arms or at least a portion thereof is angled or curved in the direction of rotation.
  • the rear surface of the at least one stator arm may alternatively be described as being provided with a plurality of recesses along at least a portion of its radial extension or along at least a portion of its length.
  • the recesses may, but do not necessarily need to, extend through the whole axial width or thickness of the at least one stator arm.
  • the invention is based on the insight that mixing performance is degraded by the formation of gas bubbles formed at the trailing edge of the rotor arms and/or at the rear edge of the stator arms.
  • the invention is further based on the insight that mixing performance may be improved by reducing the size of the formed gas bubbles, and further that such a reduction in size may be achieved by providing the trailing edge of the rotor arms and/or the rear edge of the stator arms with recesses.
  • the trailing surface is provided with recesses distributed along substantially its whole length or radial extension.
  • the rear surface is provided with recesses distributed along substantially its whole length or radial extension.
  • the recesses are formed as serrations, for example having a toothed profile.
  • the recesses are formed as grooves extending along the axial width or thickness of the rotor or stator.
  • the grooves extend only along parts of the axial width or thickness of the rotor or stator.
  • the grooves may be axial, i.e. extend straight grooves extending in the axial direction.
  • leading surface and trailing surface refer to the surfaces of the rotor which face the direction of rotation and opposite the direction of rotation, respectively.
  • front surface and rear surface refer to the surfaces or edges of the stator which face opposite the direction of rotation and in the direction of rotation, respectively.
  • At least one stator arm and at least one rotor arm are mutually configured such that at least a portion of a leading surface of said rotor arm passes a front surface of the stator arm at an angle during rotation of said rotor.
  • one of the leading or front surfaces is provided with at least one concave portion, while the other of the surfaces may be plane or flat.
  • both the leading surface and the front surface are provided with at least one concave or strictly concave portion, thereby ensuring an even greater engagement length between the rotor and stator arm.
  • the at least one concave portion may be strictly concave.
  • the at least one concave portion may define a curved portion having a radius.
  • the at least one concave portion may be formed by linear segments or a combination of linear and curved segments.
  • the leading and/or front surface may be provided with a single concave or strictly concave portion extending along essentially the entire length of the respective arm.
  • the at least one rotor arm is provided with a trailing surface facing opposite the direction of rotation and side surfaces connecting the leading and trailing surfaces, wherein at least one of said side surfaces is provided with at least one groove extending between the leading and trailing surfaces.
  • This embodiment is advantageous since the overall shear surface, and thus the size of the mixing zone, is increased without an increase in the projected area in the rotational direction, thus without an increase in inputted energy.
  • the at least one rotor arm may be provided with a plurality of grooves which are distributed along the radial extension of the arm. The at least one groove or the plurality of grooves may be tangential.
  • the at least one stator arm is provided with a rear surface facing the direction of rotation and side surfaces connecting said front and rear surfaces, wherein at least one of these side surfaces is provided with at least one groove extending between the front and rear surfaces.
  • This embodiment is advantageous since the overall shear surface, and thus the size of the mixing zone, is increased without an increase in the projected area in the rotational direction, thus without an increase in inputted energy.
  • the at least one stator arm may be provided with a plurality of grooves which are distributed along the radial extension of the arm. The at least one groove or the plurality of grooves may be tangential. In an advantageous embodiment, both the rotor and stator are provided with side surfaces with grooves, resulting in an even greater increased mixing performance.
  • the rotor arms of the rotor extend radially outwardly from a radially innermost center portion or rotor shaft.
  • the stator arms of the stator may extend radially inwardly from an outer peripheral ring portion, preferably to a radial position in close vicinity of the center portion or rotor shaft.
  • the rotor arms preferably extend to a radial position in close vicinity of the outer peripheral ring portion.
  • the stator and rotor arms advantageously extend in this manner to ensure a high mixing efficiency by providing the longest possible radial overlap between the leading and front surfaces.
  • the rotor arms may extend radially inwardly, and the stator arms extend may radially outwardly.
  • at least one of rotor comprises flow-restraining means in the form of at least one concentric ring portion interconnecting said rotor arms.
  • the tangential width of the stator and/or rotor arms decreases along their length, i.e. with the distance from the axis of rotation, i.e. the arms have a greater width at a radial inner end than at an outer radial end.
  • the rotor and stator arms usually extend in respective planes being perpendicular to the axis of rotation, but may in embodiments be angled in the axial direction. In such embodiments, the above described side surfaces are formed at an angle relative these perpendicular planes.
  • a mixing unit for use in a mixing apparatus for mixing treatment media in liquid or gaseous state with a fiber suspension
  • apparatus comprises a housing defining a mixing chamber, at least one inlet for feeding a fiber suspension and treatment media into the mixing chamber, a drive shaft connectable to a drive device for rotation of the drive shaft in operation, and an outlet for discharging the mixture of fiber suspension and treatment media.
  • the mixing unit is adapted to be arranged in the mixing chamber and comprises at least one rotor. Each rotor is adapted to be connected to the drive shaft to rotate with the drive shaft in a direction of rotation, and each rotor comprises at least one radially extending rotor arm.
  • the rotor arm is provided with a leading surface facing in the direction of rotation and a trailing surface facing opposite the direction of rotation. Side surfaces connect the leading and trailing surfaces, wherein at least one of said side surfaces is provided with at least one groove extending between the leading and trailing surfaces.
  • the rotor arm may be provided with a plurality of grooves which are distributed along the radial extension of the arm. The at least one groove or the plurality of grooves may be tangential.
  • the grooves provide an increase in the overall shear surface, and thus the size of the mixing zone is increased, thus providing improved mixing performance. This effect is achieved without an increase in the projected area in the rotational direction, thus without an increase in inputted energy.
  • the mixing unit further comprises at least one stator arranged axially adjacent at least one rotor, wherein each stator comprises at least one radially extending stator arm provided with a rear surface facing in the direction of rotation and a front surface facing opposite the direction of rotation. Side surfaces connect the front and rear surfaces, wherein at least one of said side surfaces is provided with at least one groove extending between the front and rear surfaces.
  • the at least one stator arm may be provided with a plurality of grooves which are distributed along the radial extension of the arm. The at least one groove or the plurality of grooves may be tangential.
  • both the rotor and stator are provided with side surfaces with grooves, resulting in an even greater increased mixing performance.
  • a mixing apparatus for mixing treatment media in liquid or gaseous state with or into a fiber suspension.
  • the apparatus comprises a housing defining a mixing chamber, at least one inlet for feeding a fiber suspension and treatment media into the mixing chamber, a drive shaft connectable to a drive device for rotation of the drive shaft in operation, an outlet for discharging the mixture of fiber suspension and treatment media, and a mixing unit according to the first or second aspect of the invention or embodiments thereof.
  • fig. 1 shows a schematic illustration in an axial view of a prior art mixing unit having straight radially extending rotor arms
  • fig. 2 shows a schematic illustration in an axial view of a mixing unit according to an embodiment of the first or second aspects of the invention, which mixing unit is provided with straight radially extending rotor arms provided with recesses at their trailing surfaces;
  • fig. 3 shows a schematic illustration in an axial view of a mixing unit according to another embodiment of the first or second aspects of the invention, which mixing unit is provided with forwardly curved rotor arms provided with recesses at their trailing surfaces;
  • fig. 4 shows a schematic illustration in an axial view of a mixing unit according to another embodiment of the first aspect of the invention, which mixing unit is provided with curved rotor and stator arms, where the rotor arms are provided with recesses at their trailing surfaces;
  • fig. 5 shows a schematic illustration in an axial view of a mixing unit according to another embodiment of the first aspect of the invention, which mixing unit is provided with curved rotor arms provided with recesses at their trailing surfaces and curved stator arms provided with recesses at their rear surfaces;
  • fig. 6 shows a schematic illustration in an axial view of a mixing unit according to another embodiment of the first or second aspects of invention, which mixing unit is provided with curved rotor and stator arms provided with grooves on their side surfaces;
  • fig. 7 shows a perspective view of the rotor of the mixing unit shown in fig. 6;
  • fig. 8 shows a schematic illustration in a cross sectional view of a mixing apparatus according to an embodiment of the third aspect of the invention
  • FIG. 1 shows a schematic illustration in an axial view of a prior art mixing unit.
  • the mixing unit comprises a rotor 507 having a center portion connectable to for example a drive shaft for rotation of the rotor in a direction of rotation R, and straight rotor arms or bars 508a-c extending radially outwardly from the center portion, and two concentric ring connecting the rotor arms.
  • the rotor arms are distributed with even angular spacing there between.
  • FIG 2 shows a schematic illustration in an axial view of a mixing unit according to an embodiment of the first aspect of the invention.
  • the mixing unit is adapted to be arranged in a mixing chamber of a mixing apparatus such as the mixer shown in figure 7.
  • the mixing unit is similar to that shown in figure 1 , but the rotor arms have a different configuration.
  • the trailing surface 16a of each rotor arm is provided with recesses 17a1 -a3 forming a serrated surface portion.
  • the recesses causes a plurality of smaller gas wakes to be formed, as illustrated in the right part of figure 2, thus causing much smaller gas bubbles to be released therefrom.
  • the rotor arms 8a-c are provided with a leading surface facing in the direction of rotation and side surfaces (for example 14a) connecting the leading and trailing surfaces.
  • the side surfaces are each provided with three tangential grooves (for example 15a1 -a3) extending between the leading and trailing surfaces. In other embodiments, more tangential grooves may be provided.
  • the tangential grooves 15a1 -a3 have a width
  • the rotor arms are of uniform thickness and may thus also be described as rotor bars.
  • Figure 3 shows a schematic illustration in an axial view of a mixing unit according to another embodiment of the first aspect of the invention, which embodiment corresponds to the embodiment in figure 2 except in that the rotor arms 108a-c are curved forwardly, i.e. in the direction of rotation, and in that four recesses and grooves are provided instead of three.
  • the leading surfaces (for example 1 1 1 a) of the rotor arms are provided with a concave portion in the form of a curved portion 1 13a having a radius.
  • the axis defining the radius is perpendicular to the axis of rotation.
  • the leading surface may also be described as being disposed at positive angle in the direction of rotation relative a thought radial line.
  • the concave portion may be formed by linear segments or a combination of linear and curved segments.
  • the curved portion extends along the whole length of the rotor arms. In other embodiments, there may be two or more curved portions on the leading edge. In yet other embodiments, the rotor arms, or at least portions thereof, may be angled in the direction of rotation rather than being curved.
  • FIG. 4 shows a schematic illustration in an axial view of a mixing unit according to another embodiment of the first aspect of the invention.
  • the mixing unit is provided with a rotor 207 and a stator 209.
  • the rotor has rotor arms 208a-f which are curved forwardly in the direction of rotation.
  • the leading surfaces (for example 21 1 a) of the rotor arms are provided with two concave portions in the form of radially separated curved portions (for example 213a1 , 213a2) having a radius, where the inner curved portion 213a2 is provided radially inwardly of a concentric ring which connects the rotor arms, and the outer curved portion 213a1 is provided radially outside the concentric ring.
  • the axes defining the radiuses are perpendicular to the axis of rotation.
  • the trailing surfaces (for example 216a) of the rotor arms are provided with recesses 217a1 -a3 forming a serrated surface portion radially outside the concentric ring.
  • the recesses are formed as axially extending grooves extending along the axial thickness of the rotor.
  • the stator 209 is provided with stator arms 210a-g which are curved backwards, i.e. against or opposite the direction of rotation, i.e. the stator arms extend radially outwards being curved against the direction of rotation.
  • the front surfaces (for example 212a) of the stator arms are provided with a concave portion in the form of a curved portion (for example 214a) having a radius.
  • the axis defining the radius is perpendicular to the axis of rotation.
  • the front surface may also be described as being disposed at positive angle and against the direction of rotation relative a thought radial line.
  • the curved portion extends along the whole length of the stator arms.
  • Figure 5 shows a schematic illustration in an axial view of a mixing unit according to another embodiment of the first aspect of invention.
  • the mixing unit is provided with a rotor 307 and a stator 309.
  • the rotor has rotor arms 308a which are curved forwardly in the direction of rotation in the same manner as in figure 4.
  • the leading surfaces (for example 31 1 a) of the rotor arms are provided with a concave portion in the form of a curved portion (for example 313a) having a radius.
  • the axis defining the radius is perpendicular to the axis of rotation.
  • the trailing surfaces (for example 316a) of the rotor arms are provided with recesses 317a1 -a6 forming a serrated surface portion which extends along most of the length of the respective rotor arm.
  • the recesses are formed as axially extending grooves extending along the axial thickness of the rotor.
  • the stator 309 is provided with stator arms 310a which are curved backwardly , i.e. against or opposite the direction of rotation in the same manner as in figure 4.
  • the rear surfaces (for example 318a) of the stator arms are provided with recesses 319a1 -a5 forming a serrated surface portion which extends along most of the length of the respective stator arm.
  • the recesses are formed as axially extending grooves extending along the axial thickness of the rotor.
  • the front surfaces of the stator arms are provided with a concave portion in the same manner as in figure 4.
  • Figure 6 shows a schematic illustration in an axial view of a mixing unit according to another embodiment of the first or second aspects of invention, which mixing unit is provided with curved rotor and stator arms.
  • This embodiment is identical to the embodiment shown in figure 5 except that side surfaces of each rotor and stator arm are provided with tangential grooves.
  • the side surfaces (for example 414a) which connect the leading and trailing edges of the rotor arms (for example 408a) are each provided with three tangential grooves (for example 415a1 -a3) extending between the leading and trailing surfaces.
  • Each of the stator arms, such as 410a are provided with tangential grooves in the same manner.
  • the tangential grooves have a width corresponding to the width of the recesses.
  • Figure 7 shows a perspective view of the rotor of the mixing unit shown in fig. 6.
  • the rotor 407 has a certain axial thickness, and that the leading and trailing surfaces (for example 41 1 a) are curved or angled only in the direction of rotation. Thus the normal direction of these surfaces have no axial component.
  • the tangential grooves (for example 415a1 -a3) are shown.
  • FIG 8 shows a schematic illustration in a cross sectional view of a mixing apparatus 2 according to an embodiment of the third aspect of the invention.
  • the apparatus comprises a housing defining a mixing chamber 3.
  • a first inlet 4a for the fiber suspension is provided as well as a second inlet 4b, 4b1 , 4b2 for treatment media.
  • a drive shaft 5 is provided for connection to a drive device for rotation of the drive shaft in operation.
  • the mixture of fiber suspension and treatment media is discharged through the outlet 1 .
  • a mixing unit 1 is arranged in the mixing chamber 3.
  • the mixing unit comprises two rotors 7 of the same type shown in figure 2 and one stator 9. In other embodiments, other types of rotors and stators may however be used.
  • the rotors are connected to the drive or rotor shaft 5 and are axially spaced apart from each other with the stator arranged there between.
  • the stator is connected to the housing of the apparatus.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • 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 unité de mélange (1) destinée à être utilisée dans un appareil de mélange (2) pour mélanger un milieu de traitement à l'état liquide ou gazeux avec une suspension de fibres, lequel appareil comprend un logement définissant une chambre de mélange (3), au moins une entrée (4a, 4b) pour fournir une suspension de fibres et un milieu de traitement dans la chambre de mélange, un arbre d'entraînement (5) pouvant être relié à un dispositif d'entraînement pour la rotation de l'arbre d'entraînement en fonctionnement, et une sortie (6) pour évacuer le mélange de suspension de fibres et de milieu de traitement. L'unité de mélange est adaptée pour être disposée dans la chambre de mélange (3) et comprend au moins un rotor (7), chaque rotor étant adapté pour être relié à l'arbre d'entraînement pour tourner avec l'arbre d'entraînement dans une direction de rotation, chaque rotor comprenant au moins un bras de rotor s'étendant radialement (8a-c). Une surface arrière (16a) de l'au moins un bras de rotor comporte, au moins partiellement, une pluralité d'évidements (17a1-a3).
PCT/SE2017/050546 2016-05-31 2017-05-23 Unité de mélangeur à utiliser dans un appareil de mélange, et appareil de mélange comprenant une telle unité de mélangeur Ceased WO2017209678A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1650756A SE1650756A1 (en) 2016-05-31 2016-05-31 Mixing unit comprising at least one rotor arm with recesses and a mixing apparatus comprising such a mixing unit
SE1650756-8 2016-05-31

Publications (1)

Publication Number Publication Date
WO2017209678A1 true WO2017209678A1 (fr) 2017-12-07

Family

ID=60409654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2017/050546 Ceased WO2017209678A1 (fr) 2016-05-31 2017-05-23 Unité de mélangeur à utiliser dans un appareil de mélange, et appareil de mélange comprenant une telle unité de mélangeur

Country Status (2)

Country Link
SE (2) SE1650756A1 (fr)
WO (1) WO2017209678A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230173442A1 (en) * 2020-04-06 2023-06-08 Prc-Desoto International, Inc. Mixing impellers for sealant cartridges

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647467A1 (fr) * 1993-10-07 1995-04-12 In-Mix A/S Mélangeur rotatif et tête de dispersion intégrés en une pièce
WO2013089615A1 (fr) * 2011-12-15 2013-06-20 Metso Paper Sweden Ab Unité de mélange destinée à être utilisée dans un mélangeur et mélangeur

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647467A1 (fr) * 1993-10-07 1995-04-12 In-Mix A/S Mélangeur rotatif et tête de dispersion intégrés en une pièce
WO2013089615A1 (fr) * 2011-12-15 2013-06-20 Metso Paper Sweden Ab Unité de mélange destinée à être utilisée dans un mélangeur et mélangeur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230173442A1 (en) * 2020-04-06 2023-06-08 Prc-Desoto International, Inc. Mixing impellers for sealant cartridges

Also Published As

Publication number Publication date
SE1650756A1 (en) 2017-11-28
SE539789C2 (en) 2017-11-28

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