Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/50—Mixing liquids with solids
  • B01F23/53—Mixing liquids with solids using driven stirrers
• • 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
  • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
  • B01F27/81—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis the stirrers having central axial inflow and substantially radial outflow
  • B01F27/812—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis the stirrers having central axial inflow and substantially radial outflow the stirrers co-operating with surrounding stators, or with intermeshing stators, e.g. comprising slits, orifices or screens
• • 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
  • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
  • B01F25/53—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is discharged from and reintroduced into a receptacle through a recirculation tube, into which an additional component is introduced
• • 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
  • B01F25/60—Pump mixers, i.e. mixing within a pump
  • B01F25/64—Pump mixers, i.e. mixing within a pump of the centrifugal-pump type, i.e. turbo-mixers
  • B01F25/642—Pump mixers, i.e. mixing within a pump of the centrifugal-pump type, i.e. turbo-mixers consisting of a stator-rotor system with intermeshing teeth or cages
• • 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
  • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
  • B01F2025/919—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings
  • B01F2025/9191—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component
  • B01F2025/91913—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component with feed openings facing each other, e.g. for creating counter flows, for creating a series of vortex flows
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/50—Mixing liquids with solids
  • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving

Definitions

• the invention relates to devices for mixing substances, in particular for dispersing, suspending and emulsifying gases and / or liquids and / or flowable solid substances, with a rotor having a cutting disc, inner wings and outer wings and with a pot-like stator, the wall of which is broken through by recesses and is arranged between the inner vanes and outer vanes of the rotor, the rotor and the stator being arranged in a mixing chamber into which a first product inlet port on one side of a cutting disc, a second product inlet port on the other side of the relevant cutting disk and a product outlet port assigned to the cutting disk lead.
• a device of the type mentioned at the outset is known from EP 0 587 714 B1.
• a stator arranged in a mixing chamber has recesses in mixing regions of a mixing chamber which are separated from one another by a separating disc of a rotatable rotor.
• the interaction of the stator and rotor means that substances which have entered the mixing chamber are mixed intensively with one another.
• the invention has for its object to provide devices of the type mentioned, with which a wide variety of throughput and mixing ratios can be set at a relatively high throughput with relatively little change work.
• This object is achieved according to the invention with a device of the type mentioned at the outset in that in the wall of the stator at least one row of recesses is made in the circumferential direction, which extend up to an edge web arranged in the region of a cutting disc and closing the stator.
• This object is further achieved according to the invention with a device of the type mentioned at the outset in that at least two rows of recesses are made in the circumferential direction of the stator wall, the dimensions of the recesses in one row being different from the dimensions of the recesses in at least one other row. and that between two adjacent rows of recesses a circumferentially continuous intermediate web is formed, which is arranged in the area of an associated cutting disc of the rotor.
• Both devices according to the invention are based on the general inventive idea of designing the wall of the stator differently in the mixing areas of the mixing chamber separated by the separating disk, in order to be able to set throughput and mixing ratios which correspond to the corresponding ratios when a substance is first introduced into a mixing area mixing area located on the other side of the respective cutting disc are different.
• the first-mentioned device can be regarded as a limit case of the second-mentioned device with a single recess extending over the entire circumference of the wall.
• stators of relatively large dimensions can also be used in the longitudinal direction without the risk of material strips breaking between recesses due to the mechanical nically stabilizing effect of the or each intermediate bridge exists.
• multi-stage mixing processes can also be configured with devices according to the invention.
• the edge web is made thinner than the cutting disc.
• the widths of the recesses are different in different rows.
• it is expediently provided for an increased or reduced material input that the recesses of at least one row are oriented obliquely with respect to the longitudinal direction of the stator.
• recesses of at least two rows are aligned at an angle to one another. In this way, different inputs of substances can be achieved in the respective mixing areas.
• FIG. 1 is a side view of a device formed as a mixing unit with two Stoffein and a substance outlet device according to the invention, which is operated in a circuit,
• Fig. 2 in a partially sectioned view a first
• FIG. 2 Design of a mixing unit with a stator having two rows of recesses, 3 and FIG. 4 in a partially sectioned side view configurations of stators for a mixing unit according to FIG. 2,
• FIG. 5 is a partially sectioned side view of a further embodiment of a mixing unit with a stator which has only one row of recesses and extends only over part of the height of a mixing chamber, and
• FIG. 1 shows a side view of a container 1 in which a liquid is stored as the first substance of a substance mixture to be produced at the beginning of a mixing process.
• a mixing device 3 driven by a stirring drive 2 projects into the container.
• the mixing device 3 preferably extends into the lower region of the container 1 in order to achieve effective mixing.
• a product feed valve 4 is attached, which is also connected to a first product feed line 5.
• the first product feed line 5 opens via a first product inlet connection 6 into a mixing unit 7 as the device according to the invention.
• a second product inlet connector 8 is attached to the mixing unit 7, to which a product inlet valve 9 is flanged.
• the product inlet valve 9 is connected to a second product feed line 10 which, in the illustration according to FIG. 1, extends into a sack 11 filled with powder as the second substance.
• the mixing unit 7 is connected to a mixing drive 12.
• the mixing unit 7 has a product outlet connection 13 to which a product outlet valve 14 is flanged.
• the product outlet tap 14 is also connected to a product discharge line 15 which projects into the container 1 from the upper side.
• the mixing process for mixing the liquid stored in the container 1 as the first substance with the powder stored in the sack 11 as the second substance is carried out, the liquid and the powder reach the mixing unit 7, where they are mixed in a manner explained in more detail below. mixed together, and the resulting product returns to the container 1. There, the product which has emerged directly from the mixing unit 7 mixes with the liquid or the already mixed product and is fed back to the mixing unit 7 until the mixing process is completed with an end product which is then present in the container 1.
• FIG. 2 shows a first section of the mixing unit 7 in a partially sectioned view.
• the mixing unit 7 has a drive shaft 16 which is connected to the mixing drive 12 (not shown in FIG. 1).
• the drive shaft 16 is rotatably connected to a rotor 17 which is arranged in a mixing chamber 18.
• the rotor 17 has a cutting disk 20 which extends radially outward from a plug-in sleeve 19 connected to the drive shaft 16.
• axially aligned inner wings 21 are provided, which in the embodiment according to FIG. 2 only extend to one side of the cutting disc 20.
• the rotor 17 has outer wings 22 radially spaced from the inner wings, which essentially overlap extend the entire height of the mixing chamber 18 and are enclosed by an outer wall 23 of the mixing chamber 18.
• the mixing unit 7 is equipped with a stator designed as a double-row stator 24, which is attached to a cover flange 25 which closes the mixing chamber 18 in the region of the second product inlet connection 8.
• the double-row stator 24 is designed like a pot with a circumferential wall 26 which is arranged between the inner vanes 21 and the outer vanes 22 of the rotor 17.
• the outer wall 23 of the mixing chamber 18 is perforated in an outlet region 27 in which the product outlet connection 13 is attached.
• the double-row stator 24 has a number of first recesses 29 arranged circumferentially in a first row 28, which are regularly spaced and have a trapezoidal shape in the wall with rounded corner areas 26 are introduced. Furthermore, the double-row stator 24 is formed with a second row 30 of second recesses 31, which are likewise introduced circumferentially into the wall 26 at regular intervals and are designed with rounded corner areas.
• the second recesses 31 of the second row 30 are less wide than the first recesses 29 of the first row 28 in the circumferential direction. Furthermore, the number of recesses 31 in the second row 31 is greater than the number of first recesses 29 in the first row 28.
• the recesses 29, 31 are oriented inclined with respect to the longitudinal axis of the double row stator 24, the extensions Takes 29, 31 are also arranged at an angle to each other.
• An intermediate web 32 is formed between the recesses 29, 31 of the two rows 28, 30 and is closed in the circumferential direction.
• the thickness of the intermediate web 32 in the axial direction of the double row stator 24 is less than the thickness of the cutting disk 20 in the axial direction of the rotor 17.
• the mixing process takes place with a mixing unit 7 according to FIGS. 2 and 3 as follows.
• Liquid or already partially mixed product from the container 1 enters the mixing chamber 18 in the first product inlet port 6.
• powder as second substance reaches the mixing chamber 18 via the second product inlet connection 8.
• the cutting chamber 20 divides the mixing chamber 18 into a first mixing area and a second mixing area, with a row 28, 30 of recesses 29 of different dimensions in each mixing area. 31 acts.
• the thicker configuration of the cutting disc 20 compared to the intermediate web 32 and the immersion of the wall 26 of the stator between the inner vanes 21 and the outer vanes 22 of the rotor 17 ensure that a mass transfer is prevented between the mixing areas.
• the relatively large dimensions of the first recesses 29 result in an already relatively good mixing, combined with a relatively high throughput of the incoming second substance.
• the dimensioning of the second recesses 31 of the second row 30, which is narrower than the dimensions of the first recesses 29 of the first row 28, results in a much more intensive mixing of the Shortly after the beginning of the mixing process, partially mixed product with a sufficiently high throughput. Due to the arrow-like orientation of the recesses 29, 31 in the circumferential direction, the conveying effect in both mixing regions is further increased compared to an orientation parallel to the longitudinal direction of the double-row stator 24.
• FIG. 4 shows a modification of the double row stator 24 according to FIG. 3, in which the second recesses 31 of the second row 30 are aligned parallel to the first recesses 29 of the first row 28 and the recesses 29, 31 are each inclined to the longitudinal axis of the double row stator 24 ,
• a relatively intensive introduction of powder in particular, as a second substance into the first mixing area is maintained, while the orientation of the second recesses 31 of the second row 30 facing away from the direction of rotation of the rotor 17 compared to the embodiment according to FIG second mixing area, more intensive mixing is achieved with somewhat reduced throughput.
• FIG. 5 shows a mixing unit 7 which, apart from the stator, is designed in accordance with the mixing unit 7 explained with reference to FIG. 2. The same elements are provided with the same reference numerals and are not explained in more detail below.
• the mixing unit 7 according to FIG. 5 is designed with a single-row stator 33 as a stator, the wall 34 of which extends only into the area of the cutting disc 20 of the rotor 17 and thus only over the first mixing area of the mixing chamber 18, so that the space between the inner wings 21 and outer wings 22 of the rotor 17 is free in the second mixing area.
• FIG. 6 shows a side view of the single-row stator 33 according to FIG. 5.
• recesses 35 are made, which are arranged in only one row 36 and correspond to the recesses 29, 31 of FIGS. 3 and 4 explained double row stators 24 are arranged obliquely with respect to the longitudinal direction.
• the recesses 35 end on their side pointing in the direction of the center of the mixing chamber 18 in an edge web 37 which, in accordance with the intermediate web 32 of the double-row stators 24, is thinner than the cutting disc 20.
• the mixing process using a single row stator 33 basically corresponds to the mixing procedure explained with reference to FIGS. 2 and 3 with a double row stator 24, the single row stator 33 being the theoretical limit case of a double row stator 24 with a single recess extending over the entire circumference in FIG the second row can be viewed.
• the mixing process in the second mixing area is determined solely by the interaction of the inner wings 21 and outer wings 22 of the rotor 17, this resulting in no or at most extremely little mixing, for example in the case of very shear-sensitive products such as microballoons, hollow spheres or thickening polymers.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• Mixers Of The Rotary Stirring Type (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7642073

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (13)

Family Cites Families (11)

• 2000
  • 2000-05-16 DE DE10023694A patent/DE10023694C2/de not_active Expired - Lifetime
• 2001
  • 2001-05-11 AT AT01947146T patent/ATE255952T1/de not_active IP Right Cessation
  • 2001-05-11 WO PCT/DE2001/001812 patent/WO2001087474A2/fr active IP Right Grant
  • 2001-05-11 US US10/275,128 patent/US6854878B2/en not_active Expired - Lifetime
  • 2001-05-11 DE DE50101144T patent/DE50101144D1/de not_active Expired - Lifetime
  • 2001-05-11 EP EP01947146A patent/EP1282465B1/fr not_active Expired - Lifetime
  • 2001-05-11 CA CA002406040A patent/CA2406040C/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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