EP0760254A1 - Dispositif pour l'homogénéisation de matériaux coulants - Google Patents

Dispositif pour l'homogénéisation de matériaux coulants Download PDF

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Publication number
EP0760254A1
EP0760254A1 EP96113419A EP96113419A EP0760254A1 EP 0760254 A1 EP0760254 A1 EP 0760254A1 EP 96113419 A EP96113419 A EP 96113419A EP 96113419 A EP96113419 A EP 96113419A EP 0760254 A1 EP0760254 A1 EP 0760254A1
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EP
European Patent Office
Prior art keywords
outlet
homogenizer
container
connection
designed
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.)
Granted
Application number
EP96113419A
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German (de)
English (en)
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EP0760254B1 (fr
Inventor
Erwin Seefried
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.)
Vakumix Ruehr- und Homogenisiertechnik AG
Original Assignee
Vakumix Ruehr- und Homogenisiertechnik AG
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Publication date
Priority claimed from DE19537303A external-priority patent/DE19537303B4/de
Application filed by Vakumix Ruehr- und Homogenisiertechnik AG filed Critical Vakumix Ruehr- und Homogenisiertechnik AG
Publication of EP0760254A1 publication Critical patent/EP0760254A1/fr
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Publication of EP0760254B1 publication Critical patent/EP0760254B1/fr
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    • 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
    • B01F25/52—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle with a rotary stirrer in the recirculation tube
    • 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
    • B01F27/811—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 with the inflow from one side only, e.g. stirrers placed on the bottom of the receptacle, or used as a bottom discharge pump
    • 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
    • B01F27/811—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 with the inflow from one side only, e.g. stirrers placed on the bottom of the receptacle, or used as a bottom discharge pump
    • B01F27/8111—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 with the inflow from one side only, e.g. stirrers placed on the bottom of the receptacle, or used as a bottom discharge pump the stirrers co-operating with stationary guiding elements, e.g. surrounding stators or intermeshing stators

Definitions

  • Homogenizing mixers are used in the pharmaceutical, cosmetic, chemical and food industries, among others, for the production of creams, ointments, pastes, mayonnaises and similar products. They have a mixing tank in which a homogenizer for homogenizing and circulating the substances in the mixing tank is usually arranged on the tank bottom.
  • the homogenizer is often designed as a rotor-stator dispersing machine, but can also be a circulation stirrer to achieve a better pumping effect.
  • a generic homogenizing device is known from DE 28 05 942 C2.
  • the discharge of the homogenizer is connected to the bottom of the mixing container via an annular gap designed as a throttle opening.
  • this is returned to the boiler through this throttle gap, and homogenization takes place in the boiler. If the material to be mixed becomes more viscous in the course of the mixing process, the friction in the throttle gap gradually clogs this gap, as a result of the then increasing pressure in the outlet, a sensor opens the bypass line, and the circulation is now homogenized.
  • This known device has various disadvantages.
  • the friction occurring in the throttle gap increases the energy required for homogenization.
  • a defined process control is not possible, rather the operating states homogenization in the boiler or homogenization in circulation are set automatically depending on the viscosity of the mixture, in addition transition states are possible in which both types of homogenization take place simultaneously.
  • the invention has for its object to provide a device of the type mentioned, which does not have the disadvantages mentioned or to a lesser extent.
  • the invention solves this problem in a device according to the preamble of claim 1 in that the second connection has a closing device which releases this connection when a predetermined pressure is exceeded and closes it again when the pressure falls below a predetermined pressure.
  • the mix is conveyed into the drain.
  • the lockable first connection is closed, the pressure in the outlet rises until a predetermined pressure is exceeded and the closing device releases the second connection, which leads back to the container via a short path.
  • the so-called homogenization then takes place in the boiler.
  • the second connection will usually open into the bottom of the container, but it can also open into other areas of the container that are close to the homogenizer inlet.
  • the mix can be returned through this first connection to the area of the container spaced from the homogenizer.
  • the pressure in the outlet consequently drops below a predetermined pressure, so that the closing device closes the second connection again.
  • homogenization is now taking place in circulation.
  • the cross section of the second connection is expediently chosen within the scope of the invention so that the product can flow through this second connection with relatively low friction losses even with a relatively high product viscosity.
  • the friction losses occurring in the throttle gap in the prior art are thus avoided.
  • Pressure losses when passing through the second connection only occur to a small extent.
  • the closing device can be a valve, for example, which is controlled by a pressure sensor arranged in the outlet. In the context of the invention, however, it is preferred that the closing device is biased into the closed position by an external force. This external force is preferably a spring force. If the pressure in the drain increases, the closing device is then pressed into its open position against the spring force.
  • the second connection will connect the outlet of the homogenizer to the tank bottom.
  • the second connection opens in the container in the area of the inlet of the homogenizer and thereby interferes with the inflow into the homogenizer.
  • the second connection can be formed, for example, as one or more bores or bores penetrating the homogenizer housing and / or the stator of the homogenizer, which preferably extend axially (parallel to the axis of rotation of the homogenizer) and each have associated locking devices.
  • this ring channel between the housing of the homogenizer and the stator or the stator cover be trained.
  • the width of the ring channel is preferably dimensioned such that a passage with low friction and low pressure loss is also possible for relatively highly viscous mix.
  • the ring channel opens between the homogenizer housing and the stator cover in the region of the outer circumference of the homogenizer in the container bottom, the return of the mixed material into the container in this region does not disturb the inflow into the homogenizer.
  • the closing device is preferably designed as a sealing ring arranged in the region of the mouth of the ring channel, which is spring-biased into a closed position in which it closes the ring channel from the outlet and which counteracts when a predetermined pressure in the outlet is exceeded the spring force can be moved into an open position in which it opens the ring channel towards the outlet.
  • the mixture after closing the shut-off of the first connection and the subsequent pressure increase in the outlet of the homogenizer, it is possible for the mixture to exit the boiler uniformly over the entire circumference of the annular channel, so that the contents of the container are mixed uniformly.
  • the first connection is usually designed as a circulation line, which opens into the upper region of the container. With the help of this circulation line, it is possible to shift in particular higher-viscosity products in the boiler and thus to ensure that even these higher-viscosity products are uniformly homogenized.
  • a homogenizer is to be understood as any device that achieves a mixing and / or homogenizing effect using kinetic energy.
  • the homogenizer can be designed as a rotor-stator dispersing machine which primarily converts the kinetic energy of the rotor into a dispersing effect by means of strong turbulence and thus achieves intensive homogenization. Because of this turbulence, these rotor-stator dispersing machines produce only a relatively small pumping action, so that high drive energies may be required.
  • a so-called circulation agitator instead of a rotor-stator dispersing machine as a homogenizer, which primarily converts the kinetic energy of the rotor into a pumping action and thus into kinetic energy of the material to be homogenized and only has a low dispersing effect Has turbulence.
  • Intermediate stages are also possible; for example, it is conceivable to attach additional vanes to the rotor of a rotor-stator dispersing machine in order to improve the pumping effect, as it is known from DE-A-34 17 242 is known.
  • the use of a homogenizer known from EP-B-0 290 033 is also conceivable.
  • a homogenizer with a higher pumping effect has various advantages compared to a rotor-stator dispersing machine with a low pumping effect. Due to the high pumping speed of the circulation agitator, CIP cleaning of the entire device can be carried out without the aid of additional pumps.
  • the good pumping action allows the material to be conveyed out of the mixing device according to the invention into a second mixing container, while both the mixing device according to the invention and the second mixing container are under reduced pressure or vacuum. If there is only one rotor-stator dispersing machine with low pumping action, it may be necessary to aerate the mixing device from which it is to be discharged in order to support the discharge. This in turn can lead to undesirable air pockets in the product to be homogenized.
  • the possible high circulation speed when homogenizing in circulation using a circulation agitator makes it possible to draw smaller amounts of powder into the circulation flow and thus to feed the material to be homogenized.
  • the device according to the invention basically has a mixing container 1 and a homogenizer 2 driven by a drive 3.
  • the products entering the inlet of the homogenizer at 4 can be fed back out of the homogenizer outlet either through the ring channel to be described in more detail below (homogenization in the boiler, indicated by the arrows at 5), or through the external circulation line 6 in the upper region of the mixing container 1, so that the homogenization indicated by the arrows at 7 takes place in circulation.
  • Shut-off valves 8, 9 are used to open or close the circulation line 6. After the homogenization has been completed, the product can be conveyed out of the mixing container 1 via the shut-off valve 10 into a drain.
  • the structure of the homogenizer 2 can be seen more clearly in FIGS. 2 and 3.
  • the drive 3 drives, via a shaft 11 provided with a hub 12, the rotor 13 which is connected to this shaft 11 in a rotationally fixed manner and which has two rows of rotor toothings 14 and 15 which are concentric and point downward.
  • the stator 17 is connected to the homogenizer housing 16 and has two rows of stator toothings 18, 19 which are concentric with one another.
  • a stator cover 20 connected to the stator 17 covers the rotor 13 on its outer circumference and at the same time forms the inlet of the homogenizer, designated 21.
  • the channel 22 widens in the axial direction in the direction of rotation of the rotor 13 up to the connection of the outlet 22 to the circulation line 6.
  • the axial width narrows of the outlet 22 on a short circumferential section, this use causes a large part of the mixed material conveyed in the circumferential direction through the outlet 22 to exit into the circulation line 6 when the shut-off valve 8 and one of the valves 9 or 10 are open.
  • the aforementioned transition from the large axial width to the peripheral portion having a small axial width of the outlet 22 is indicated in FIG. 2 at 23.
  • this homogenizer corresponds to a conventional rotor-stator dispersion machine of the prior art.
  • an annular channel 24 is now provided between the homogenizer housing 16 and the stator cover 20, which connects the outlet 22 to the product space of the mixing container 1.
  • the material contained in the container 1 is fed to the homogenizer 2 via the inlet 21.
  • high forces in particular dispersion and shear forces
  • the stator toothings 18, 19 press it into the annular outlet channel 22 arranged concentrically with the rotor shaft 11. If the valve 8 of the circulation line 6 is closed, the pressure in the outlet 22 rises until the sealing ring 26 is lifted against its force against the force of the spring device 25 from its seat surface 27, so that the product returns from the outlet 22 through the annular channel 24 can flow into the container 1.
  • the so-called mixing takes place in the boiler (reference number 5 in FIG. 1).
  • valve 9 After completion of the homogenization, the valve 9 is closed and the valves 8 and 10 opened, the content of the mixing container 1 is then conveyed into the drain by the homogenizer 2.
  • FIGS. 4 to 7 A second embodiment of the invention is shown in FIGS. 4 to 7.
  • This embodiment largely corresponds to the first embodiment, therefore the same parts are designated by the same reference numerals.
  • the differences from the first embodiment lie in the design of the homogenizer as a circulation agitator and in the design and management of the circulation line 6. These differences are described in more detail below.
  • the rotor 13 has conveyor blades 34 which are primarily designed to convey the material to be homogenized into the outlet 22 and, in contrast to the first embodiment, only a relatively low shear rate. and have a dispersing effect on this material. Accordingly, the rotational energy of the rotor 13 is primarily converted into kinetic energy of the material to be homogenized (pumping action).
  • the stator has guide surfaces or blades 35 which are designed to achieve an essentially laminar flow of the material conveyed by the conveyor blades 34. These guide vanes 35 thus serve, unlike in a rotor-stator dispersing machine, not as baffles to achieve a dispersing effect.
  • the homogenizer 2 of this embodiment thus achieves a significantly higher pumping power than the rotor-stator dispersion machine of the first embodiment.
  • the circulation line 6 is also adapted differently to this higher pumping capacity (see FIGS. 4 and 5). Because of the achievable high circulation speed in the circulation line 6, powder can be sucked into the circulation flow via a valve 29 and thus mixed with the material. Additional liquid can be supplied via a valve 28.
  • valve 30 In normal circulation operation, valve 30 is open and valves 31 and 32 are closed. By closing the valve 30 and opening the valve 32, the homogenized material can be fed to another mixing container, for example. This is often necessary if the aqueous phase and the fat phase are first mixed separately when producing an emulsion.
  • the high pumping action of the homogenizer 2 also enables CIP cleaning (cleaning in place) of the entire system without the aid of additional pumps.
  • cleaning liquid is introduced into the system and pumped through the circulation line 6 by means of the homogenizer 2.
  • the cleaning liquid can be sprayed in the upper region of the container 1 by means of a spray head 33 and thus uniformly wet the entire inner surface of the container 1.
  • the entire pipeline path can also be flushed in circulation.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP96113419A 1995-08-29 1996-08-21 Dispositif pour l'homogénéisation de matériaux coulants Expired - Lifetime EP0760254B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19531775 1995-08-29
DE19531775 1995-08-29
DE19537303A DE19537303B4 (de) 1995-08-29 1995-10-06 Vorrichtung zum Homogenisieren fließfähiger Stoffe
DE19537303 1995-10-06

Publications (2)

Publication Number Publication Date
EP0760254A1 true EP0760254A1 (fr) 1997-03-05
EP0760254B1 EP0760254B1 (fr) 2001-03-14

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EP96113419A Expired - Lifetime EP0760254B1 (fr) 1995-08-29 1996-08-21 Dispositif pour l'homogénéisation de matériaux coulants

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0896833A1 (fr) * 1997-08-11 1999-02-17 A. BERENTS GMBH & CO. KG Dispositif d'homogénéisation des matiériaux aptes a couler
WO2000001792A1 (fr) * 1998-07-02 2000-01-13 Wella Aktiengesellschaft Procede pour la preparation de solutions aqueuses de sulfates d'alkylether
EP0988887A1 (fr) * 1998-08-25 2000-03-29 Vakumix Rühr- und Homogenisiertechnik Aktiengesellschaft Homogénisateur avec un dispositif de protection sur le rotor
EP1121974A1 (fr) * 2000-01-31 2001-08-08 Dr. C. Ekkehard Stelzer Procédé et dispositif de mélange
EP1477239A1 (fr) * 2003-05-14 2004-11-17 Vakumix Rühr- und Homogenisiertechnik Aktiengesellschaft Dispositif de mélange et/ou d'homogénéisation
US6866411B1 (en) 2000-01-31 2005-03-15 Tetra Laval Holdings & Finance S.A. Mixing method and apparatus
US9050568B2 (en) 2008-01-16 2015-06-09 Tetra Laval Holdings & Finance S.A. Hybrid mixer
JP2021003668A (ja) * 2019-06-26 2021-01-14 株式会社イズミフードマシナリ 食用粉体溶解システム
CN114099876A (zh) * 2009-08-11 2022-03-01 瑞思迈发动机及马达技术股份有限公司 单级轴对称鼓风机和便携式通风机
US11998690B2 (en) 2020-11-03 2024-06-04 Resmed Motor Technologies Inc. Single stage, axial symmetric blower and portable ventilator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036067A2 (fr) * 1980-03-14 1981-09-23 Haagen & Rinau Dispositif de mélange et d'homogénéisation d'au moins deux matières
DE7804138U1 (fr) * 1978-02-13 1987-06-04 Berents, Alwin, 2800 Bremen, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7804138U1 (fr) * 1978-02-13 1987-06-04 Berents, Alwin, 2800 Bremen, De
EP0036067A2 (fr) * 1980-03-14 1981-09-23 Haagen & Rinau Dispositif de mélange et d'homogénéisation d'au moins deux matières

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0896833A1 (fr) * 1997-08-11 1999-02-17 A. BERENTS GMBH & CO. KG Dispositif d'homogénéisation des matiériaux aptes a couler
WO2000001792A1 (fr) * 1998-07-02 2000-01-13 Wella Aktiengesellschaft Procede pour la preparation de solutions aqueuses de sulfates d'alkylether
EP0988887A1 (fr) * 1998-08-25 2000-03-29 Vakumix Rühr- und Homogenisiertechnik Aktiengesellschaft Homogénisateur avec un dispositif de protection sur le rotor
EP1121974A1 (fr) * 2000-01-31 2001-08-08 Dr. C. Ekkehard Stelzer Procédé et dispositif de mélange
WO2001056687A1 (fr) * 2000-01-31 2001-08-09 Tetra Laval Holdings & Finance S.A. Dispositif et procede de melange
US6866411B1 (en) 2000-01-31 2005-03-15 Tetra Laval Holdings & Finance S.A. Mixing method and apparatus
AT414101B (de) * 2000-01-31 2006-09-15 Stelzer C Ekkehard Dr Verfahren und vorrichtung zum mischen fliessfähiger stoffe
EP1477239A1 (fr) * 2003-05-14 2004-11-17 Vakumix Rühr- und Homogenisiertechnik Aktiengesellschaft Dispositif de mélange et/ou d'homogénéisation
US9050568B2 (en) 2008-01-16 2015-06-09 Tetra Laval Holdings & Finance S.A. Hybrid mixer
CN114099876A (zh) * 2009-08-11 2022-03-01 瑞思迈发动机及马达技术股份有限公司 单级轴对称鼓风机和便携式通风机
JP2021003668A (ja) * 2019-06-26 2021-01-14 株式会社イズミフードマシナリ 食用粉体溶解システム
US11998690B2 (en) 2020-11-03 2024-06-04 Resmed Motor Technologies Inc. Single stage, axial symmetric blower and portable ventilator

Also Published As

Publication number Publication date
EP0760254B1 (fr) 2001-03-14

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