EP3581262B1 - Rühreranordnung - Google Patents

Rühreranordnung Download PDF

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Publication number
EP3581262B1
EP3581262B1 EP18177890.3A EP18177890A EP3581262B1 EP 3581262 B1 EP3581262 B1 EP 3581262B1 EP 18177890 A EP18177890 A EP 18177890A EP 3581262 B1 EP3581262 B1 EP 3581262B1
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EP
European Patent Office
Prior art keywords
impeller
openings
agitator arrangement
cleaning
shaft
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.)
Active
Application number
EP18177890.3A
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English (en)
French (fr)
Other versions
EP3581262A1 (de
Inventor
Michael Juhl FØNS
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.)
Alfa Laval Corporate AB
Original Assignee
Alfa Laval Corporate 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 Alfa Laval Corporate AB filed Critical Alfa Laval Corporate AB
Priority to EP18177890.3A priority Critical patent/EP3581262B1/de
Priority to PCT/EP2019/062780 priority patent/WO2019238356A1/en
Publication of EP3581262A1 publication Critical patent/EP3581262A1/de
Application granted granted Critical
Publication of EP3581262B1 publication Critical patent/EP3581262B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • 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
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar 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
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/2121—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts composed of interconnected parts
    • 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
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/2122—Hollow shafts
    • 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
    • B01F27/91—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/10—Maintenance of mixers
    • B01F35/145—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means
    • B01F35/1452—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids
    • B01F35/1453—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids by means of jets of fluid, e.g. air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • B08B9/0936—Cleaning containers, e.g. tanks by the force of jets or sprays using rotating jets

Definitions

  • the disclosure relates to an agitator arrangement for mixing a liquid in a mixing tank and for cleaning the mixing tank.
  • the disclosure also relates to a mixing tank comprising such an agitator arrangement.
  • the disclosure can be arranged for example in the liquid food industry of dairy, beverage, brewing, processed foods, pharmaceutical and cosmetics, or the like.
  • mixing tanks and agitators should preferably be designed for providing highly efficient mixing, improved cost-efficiency, zero in-tank maintenance and eliminating contamination risks.
  • An object of the present disclosure is to provide an agitator arrangement and mixing tank including such an agitator arrangement, where the previously mentioned problems are avoided. This object is at least partly achieved by the features of the independent claims.
  • the dependent claims contain further developments of the agitator arrangement.
  • an agitator arrangement for mixing a liquid in a mixing tank and for cleaning the mixing tank.
  • the agitator arrangement comprises a rotatable hollow shaft extending in an axial direction, a first impeller secured to the shaft at a first axial position and a second impeller secured to the shaft at a second axial position.
  • the second impeller comprises a plurality of openings configured for spraying a cleaning liquid on the first impeller for cleaning the first impeller.
  • the second impeller includes an impeller hub and impeller blades secured to the impeller hub. The plurality of openings are located in the impeller hub.
  • the second impeller comprises a plurality of openings configured for spraying a cleaning liquid on the first impeller for cleaning the first impeller.
  • the impeller hub Having the plurality of openings located in the impeller hub enables simplified manufacturing and more cost-effective design of the agitator arrangement because thereby no additional cleaning units have to be manufactured and installed along the rotatable hollow shaft. Instead, the impeller hub has dual functionality in terms of securing the impeller blades and acting as spray unit for the cleaning liquid.
  • the second impeller comprises at least 4, specifically at least 6, more specifically at least 8 and even more specifically at least 16 openings configured for spraying a cleaning liquid on the first impeller.
  • at least 4 openings configured for spraying the cleaning liquid on the first impeller are required.
  • the openings are preferably more or less equally distributed around the circumference of the hub of the second impeller.
  • the plurality of openings have a substantially cylindrical shape with a diameter of 1 ⁇ 4 mm, and specifically of 1.5 - 3 mm.
  • the substantially cylindrical shape enables the openings to be cost-efficiently drilled.
  • the specific diameter of the openings has during experimental testing shown to provide a strong cleaning spray with adequate flow and coverage for enabling efficient cleaning of the first impeller.
  • an axial orientation of the plurality of openings respectively, define an inclination angle of 1-45 degrees, specifically 1-10 degrees, and more specifically 2-5 degrees, with respect to the axial direction of the rotatable hollow shaft.
  • a suitable inclination angle of the axial orientation of the plurality of openings depends on parameters such as the distance between the first and second impeller and the diameter of the first impeller. The defined ranges generally provide a satisfactory cleaning result of the first impeller.
  • an axial orientation of the plurality of openings define an angle of about 90 degrees with respect to a plane of an interior surface of the impeller hub at a location of each corresponding opening.
  • This enables simplified manufacturing of the impeller hub because the openings may be more easily formed, for example by drilling, when the openings extend perpendicular to the surface of the impeller hub at a location of each corresponding opening. Forming an opening, for example by drilling, at an angle ⁇ , wherein 0 ⁇ ⁇ ⁇ 90 degrees, is increasingly difficult upon departing from the perpendicular (90 degrees) orientation to a surface.
  • the impeller hub comprises a first part and a second part, wherein the first and second parts are attached to each other, and wherein the plurality of opening are located in the first part and the impeller blades are attached to the second part.
  • a distance between the first axial position and the second axial position is 400 ⁇ 4000 mm, specifically 500 ⁇ 3000 mm, in the axial direction of the rotatable hollow shaft.
  • the rotatable hollow shaft comprises one or more first shaft sections extending from the first end region of the rotatable shaft to a first axial end of the first impeller, and a second shaft section extending from a second axial end of the first impeller to a first axial end of the second impeller.
  • the first impeller is free from openings configured for spraying a cleaning liquid. It is known that deaeration of a liquid food product within the tank results in reduced oxygen content in liquid food products leads to extended shelf life and improved taste stability. Stripping gas for deaeration of the liquid food product is preferably introduced, for example via openings in the agitator arrangement, at a low position within the tank for enabling a maximal reaction time with the liquid food product before the stripping gas bubbles reach the surface of the liquid food product and are vented.
  • This design further underlines the need for providing the second impeller with a plurality of openings configured for spraying a cleaning liquid on the first impeller for cleaning the first impeller, because the lack of openings in the first impeller configured for spraying a cleaning liquid makes cleaning of the first impeller more difficult.
  • the second impeller further comprises at least one additional opening for each blade of the second impeller and configured for spraying a cleaning liquid on the blades of the second impeller.
  • cleaning liquid may be sprayed onto the blades of the second impeller for providing adequate cleaning of the second impeller.
  • the agitator arrangement may further comprise a third impeller secured to the shaft at a third axial position.
  • the third impeller may for example include a plurality of openings configured for spraying a cleaning liquid on the first and/or second impeller for cleaning the first and/or second impeller.
  • a third impeller may further enable improved agitation of the liquid within the tank, as well as use of larger tanks with maintained agitation capacity.
  • the third impeller may be free from openings configured for spraying a cleaning liquid.
  • the third impeller may be free from openings configured for spraying a cleaning liquid for enabling improved deaeration of the liquid food product, as discussed above.
  • a first end region of the rotatable shaft is configured to be attached to an upper side of the mixing tank, and the first impeller is located between the first end region and the second impeller.
  • the disclosure relates to a mixing tank including an agitator arrangement as described above.
  • the first impeller is located above the second impeller in the mixing tank.
  • a first end region of the rotatable shaft is attached to an upper side of the mixing tank, and a second end region of the rotatable shaft is free from attachment to the mixing tank.
  • a first end region of the rotatable shaft is attached to an upper side of the mixing tank and a second end region of the rotatable shaft is attached to a lower side of the mixing tank, wherein the agitator arrangement comprises openings in lower cleaning hub for spraying cleaning liquid on a bottom bearing support of the agitator arrangement and/or bottom of the mixing tank.
  • FIG 1 there is depicted a partly sectional view of a mixing tank 1 and an outside view of an agitator arrangement 2 located within the mixing tank 1.
  • Figure 2 shows a cross-sectional view of the same agitator arrangement 2 according to the disclosure.
  • the mixing tank 1 and agitator arrangement 2 are configured for being employed in the food and beverage industry, but also pharmaceutical and cosmetics industry, and should thus preferably be designed for providing highly efficient mixing, improved cost-efficiency, zero in-tank maintenance and very low contamination risk.
  • the agitator arrangement 2 is suitable for mixing a liquid in the mixing tank 2 and for cleaning the mixing tank 2.
  • the agitator arrangement thus at least has a dual functionality.
  • the agitator arrangement 2 is configured for being attached to a top portion 20 of the mixing tank and to protrude into the mixing tank from said top portion 20.
  • the attachment of the agitator arrangement to the tank may for example be realised by means a flange of the agitator arrangement and threaded fasteners.
  • a first impeller 7 is secured to the shaft 4 at a first axial position
  • a second impeller 8 is secured to the shaft 4 at a second axial position.
  • the second impeller 8 comprises a plurality of openings 9 configured for spraying a cleaning liquid 10 on the first impeller 7 for cleaning the first impeller 7.
  • the first end region 14 of the rotatable shaft 4 is configured to be attached to the upper side of the mixing tank 1, and the first impeller 7 is located between the first end region 14 and the second impeller 8. Moreover, the first impeller is located above the second impeller in the mixing tank 1 shown in figure 1 .
  • a power source 11 such as an electrical motor, drivingly connected to the hollow shaft, for example via a transmission unit 12, causes the hollow shaft and associated first and second impellers 7, 8 to rotate and to generate a strong whirl flow and mixing effect of a liquid located within the tank 2.
  • the second impeller 8 may comprise further openings configured for spraying the interior surface of the mixing tank and/or a bearing support of the agitator arrangement at a lower part of the agitator arrangement, if such a bearing support is provided.
  • pressurized cleaning liquid may also be supplied at a second external inlet 17 in the cleaning mode, and further conveyed through an outer flow path of a double walled section 18 of the shaft 4 to openings located in a spray ball 15 included in the agitator arrangement 2.
  • the basic concept of the disclosure is equally applicable to an agitator arrangement 2 without a double walled section of the shaft 4 and without a spray ball 15.
  • Cleaning liquid may be drained from the mixing tank via an outlet (not shown) of the mixing tank 1 and re-circulated to the external inlet 13 of the agitator arrangement 2.
  • the two axially spaced apart first and second impellers 7, 8 generally provide improved agitation of the liquid within the tank compared with a single impeller agitator arrangement.
  • the first and second impeller design also enables use of larger mixing tanks with maintained agitation capacity. Hence, the first and second impeller design enables improved manufacturing cost-efficiency.
  • a distance 21 between the first axial position and the second axial position may for example be about 400 ⁇ 4000 mm, specifically about 500 ⁇ 3000 mm, in the axial direction 5 of the rotatable hollow shaft 4.
  • the design wherein the second impeller 8 comprises openings configured for spraying a cleaning liquid on the first impeller 7 during cleaning of the agitator arrangement may be particularly relevant in situations wherein the first impeller 7 for any reason is free from openings configured for spraying a cleaning liquid.
  • the second impeller 8 comprises opening configured for spraying a cleaning liquid on the first impeller 7 during cleaning of the agitator arrangement.
  • the first impeller 7 may be designed to be free from openings configured for spraying a cleaning liquid is when the agitator arrangement 2 further is configured for performing a deaeration process of the liquid within the tank, wherein the openings 9 for spraying a cleaning liquid in a cleaning mode of the agitator arrangement 2 also are used for injecting a deaeration gas into the liquid of the tank 1 in a deaeration mode of the agitator arrangement 2.
  • a deaeration gas e.g. N2 or CO2 is supplied to the liquid within the tank via the agitator arrangement 2.
  • a deaeration gas also referred to as stripping gas
  • stripping gas is supplied from an external source to the agitator arrangement, which subsequently guides the stripping gas to the plurality of openings 9 of the second impeller 8, such that small bubbles of stripping gas are created and allowed to whirl upwards towards the surface of the liquid, thereby stripping oxygen out of the liquid.
  • stripping gas is supplied from an external source to the agitator arrangement, which subsequently guides the stripping gas to the plurality of openings 9 of the second impeller 8, such that small bubbles of stripping gas are created and allowed to whirl upwards towards the surface of the liquid, thereby stripping oxygen out of the liquid.
  • the stripping is lighter than the liquid and the stripping gas bubbles therefore rise towards the surface, and that is it desirable to have a long reaction time of the gas bubbles with the liquid before the gas bubbles reach the surface of the liquid within the tank 1, it is often advantageous to supply the stripping gas at a low position in the mixing tank. Consequently, when the first impeller 7 is located above the second impeller 8, as seen in a vertical direction of an assembled agitator arrangement within the mixing tank 1, it may be advantageous to have the first impeller 7 free from openings configured for spraying a cleaning liquid, because otherwise a significant portion of the stripping gas would be entering the liquid via openings in the first impeller 7.
  • having the second impeller 8 comprising openings configured for spraying a cleaning liquid on the first impeller 7 during cleaning of the agitator arrangement enables implementation of an efficient deaeration process of the liquid within the tank while maintaining an adequate cleaning of the agitator arrangement and tank interior.
  • the rotatable hollow shaft 4 comprises a plurality of first shaft sections 22, 23 that are mutually connected and extending from the first end region of the rotatable shaft to a first axial end 25 of the first impeller 7, and a second shaft section 24 extending from a second axial end 26 of the first impeller 7 to a first axial end 27 of the second impeller 8.
  • the first and second shaft sections 22, 23, 24 may be threadingly attached to first and/or second impeller 7, 8.
  • the second shaft section 24 may be threadingly attached to the first axial end 27 of the second impeller 8.
  • Figure 3 shows a cross-sectional view of an example embodiment of a second impeller 8 in a close-up view.
  • figure 3 shows two of the plurality of openings 9 located in the second impeller 8 and configured for spraying a cleaning liquid on the first impeller for cleaning the first impeller 7.
  • the openings 9 provide a fluid passage between the internal flow path 19 of the rotatable hollow shaft 4 and the exterior of the agitator arrangement 2.
  • Design aspects of the plurality of openings that have an effect of the spraying of a cleaning liquid on the first impeller for cleaning the first impeller are selected according to the specific circumstances of each implementation, taking into account factors like type of liquid food product to be cleaned away, the pressure, temperature and detergent of the cleaning liquid, the axial distance between the first and second impellers 7, 8, the radial length of the impeller blades 31, or the like.
  • the plurality of openings 9 may have a substantially cylindrical shape. This enables the openings to be cost-efficiently manufactured by drilling.
  • the plurality of openings 9 may have a diameter of 1 ⁇ 4 mm and specifically of 1.5 ⁇ 3 mm. This diameter generally results in improved cleaning effect of the first impeller 7.
  • a centre of an outlet of the plurality of openings 9, respectively, is located a distance 33 of about 10 - 50 mm from an exterior surface 32 of the rotatable hollow shaft, as seen in a transverse direction 6, which is perpendicular to the axial direction 5 of the rotatable hollow shaft 4.
  • the second impeller may for example comprise at least 4, specifically at least 6, more specifically at least 8 and even more specifically at least 16 openings 9 configured for spraying a cleaning liquid on the first impeller 7.
  • the second impeller comprises 16 openings 9.
  • the second impeller 8 of the example embodiment of figure 4 further comprises a total of three impeller blades 31, equally distributed around the circumference of the second impeller 8. However, the number of impeller blades can be varied.
  • the second impeller 8 further includes an impeller hub 34 having the impeller blades 31 secured thereto.
  • the impeller hub 34 enables a more modular design of the agitator arrangement by assembling the rotatable shaft 4 out of a suitable combination of first and second shaft sections 22-24 and impeller hubs 34.
  • the first and second shaft sections 22-24 may for example be threadingly attached to the impeller hubs 34, either directly or by means of an individual attachment collar 35 as shown in the example embodiment of figure 3 .
  • the plurality of openings 9 configured for spraying cleaning liquid on the first impeller 7 are located in the impeller hub. Thereby the impeller blades 31 and the shaft sections 22-24 of the tubular shaft 4 may have a less complicated design and thus being more cost-efficient.
  • Figure 5 shows a cross-sectional view along an axial plane of the impeller hub 34.
  • the impeller hub may comprise a first part 40 and a second part 41, wherein the first and second parts 40, 41 are attached to each other.
  • the first part 40 is configured for being attached to the tubular shaft 4
  • the second part 41 is configured to be free from connections to the mixing tank 1 for enabling simplified cleaning of the mixing tank 1 and agitator arrangement 2.
  • the second part 41 of the impeller hub 34, or any other part of the agitator arrangement 2 may have connection arrangement for rotatable connecting the rotatable hollow haft 4 of the agitator arrangement 2 to a bearing support for rotatably attaching the second part 41 to the mixing tank 1.
  • Such additional fastening of the agitator arrangement 2 may be necessary for avoiding too large bending motion of the rotatable hollow shaft 4 during rotation of the first and second impellers 7, 8.
  • the agitator arrangement may comprise at least one opening 50 in a second part 41 of the hub 34 for spraying cleaning liquid on a bottom bearing support of the agitator arrangement 2 and/or bottom of the mixing tank 1.
  • the first and second parts 40, 41 are welded together along a circumferentially extending weld seam 42.
  • Manufacturing of the second impeller in two parts 40, 41 has several advantages, such as simplified manufacturing of the openings 9.
  • the second impeller 34 further has a more modular design wherein a single type of first part 40 may be connected with various different types of second parts 41, for example for enabling attachment to various types and sizes of impeller blades to the impeller hub 34.
  • the plurality of openings 9 are located in the first part 40 and the impeller blades are configured to be attached in slits 56 made in the sidewall of the second part 41.
  • the first part 40 of the impeller hub 34 may for example, on a first axial side, have a sleeve section 57 facing the second section 24 of the tubular shaft 4, and being configured be being attached to said second section 24.
  • the first part 40 of the impeller hub 43 may further, on a second axial side located opposite to the first axial side, have a flange section 58 that extends radially outwards from the sleeve section 57.
  • the openings 9 for spraying cleaning liquid on the first impeller 8 may be located in the flange section 58 of the first part 40 of the second impeller 7.
  • an axial orientation 60 of the plurality of openings defines an inclination angle 43 of 1- 45 degrees, specifically 1-10 degrees, and more specifically 2-5 degrees, with respect to the axial direction 5 of the rotatable hollow shaft 4.
  • These ranges of the inclination angle 43 has shown to provide good results in terms of cleaning effect of the first impeller.
  • an axial orientation 60 of the plurality of openings 9, respectively, define an angle 44 of about 90 degrees with respect to a plane of an interior surface 45 of the impeller hub 34 at a location of each corresponding opening 9.
  • the surface 45 at the area of the opening 9 is substantially perpendicular to the axial orientation of each opening 9, because thereby the risk that the top edge of the drill drifts away from a desired drilling location. Drilling an opening at an inclined angle with respect to a surface is significantly more difficult than drilling an opening at a straight angle to the surface.
  • the modular design of the hub 34 enables drilling from the inside of the hub 34 before the first and second parts 40, 41 of the hub have been secured to each other.
  • the second part 41 of the impeller hub 43 may have a substantially cylindrical shape, and one axial side of the second part 41 may be fastened to the radially outer edge of the flange section 58 of the first part 40 of the hub 34.
  • FIG 6 shows a side view of the second impeller 8.
  • the second impeller 8 may comprise additional openings 70 for each impeller blade 31 of the second impeller 8 and configured for spraying a cleaning liquid on the impeller blades 31 of the second impeller 8.
  • the agitator arrangement 2 may equally be equipped with a third impeller secured to the rotatable hollow shaft 4 at a third axial position.
  • the third impeller may for example comprise a plurality of openings configured for spraying a cleaning liquid on the first and/or second impeller for cleaning the first and/or second impeller.
  • the third impeller may be free from openings configured for spraying a cleaning liquid. Also yet further impellers are possible.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)

Claims (14)

  1. Rühreranordnung (2) zum Mischen einer Flüssigkeit in einem Mischtank (1) und zum Reinigen des Mischtanks (1), wobei die Rühreranordnung (2) Folgendes umfasst:
    eine drehbare hohle Welle (4), die sich in einer axialen Richtung (5) erstreckt,
    ein erstes Flügelrad (7), das an einer ersten axialen Position an der Welle (4) befestigt ist,
    ein zweites Flügelrad (8), das an einer zweiten axialen Position an der Welle (4) befestigt ist,
    wobei das zweite Flügelrad (8) eine Vielzahl von Öffnungen (9) umfasst, die dafür konfiguriert sind, eine Reinigungsflüssigkeit auf das erste Flügelrad (7) zu sprühen, um das erste Flügelrad (7) zu reinigen, dadurch gekennzeichnet, dass das zweite Flügelrad (8) eine Flügelradnabe (34) und Flügelradblätter (31), die an der Flügelradnabe (34) befestigt sind, einschließt, und wobei die Vielzahl von Öffnungen (9) in der Flügelradnabe (34) angeordnet ist.
  2. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei das zweite Flügelrad (8) mindestens 4, speziell mindestens 6, spezieller mindestens 8 und noch spezieller mindestens 16 Öffnungen (9) umfasst, die zum Sprühen einer Reinigungsflüssigkeit auf das erste Flügelrad (7) konfiguriert sind.
  3. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei die Rühreranordnung (2) eine Strömungsbahn (19) von einem ersten Endbereich (14) der drehbaren hohlen Welle (4) zu der Vielzahl von Öffnungen (9) umfasst, so dass unter Druck gesetzte Reinigungsflüssigkeit, die an dem ersten Endbereich (14) der drehbaren hohlen Welle (4) zugeführt wird, an der Vielzahl von Öffnungen (9) herausgesprüht werden kann.
  4. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei die Vielzahl von Öffnungen (9) eine im Wesentlichen zylindrische Form mit einem Durchmesser von 1 bis 4 mm und speziell von 1,5 bis 3 mm aufweist.
  5. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei eine axiale Ausrichtung (60) der Vielzahl von Öffnungen (9) jeweils einen Neigungswinkel (43) von 1 bis 45 Grad, speziell 1 bis 10 Grad und noch spezieller 2 bis 5 Grad in Bezug auf die axiale Richtung (5) der drehbaren hohlen Welle (4) definiert.
  6. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei eine Mitte eines Auslasses der Vielzahl von Öffnungen (9) jeweils in einem Abstand (33) von 10 bis 50 mm von einer Außenfläche (32) der drehbaren hohlen Welle (4) angeordnet ist, gesehen in einer Richtung (6), senkrecht zu der axialen Richtung (5) der drehbaren hohlen Welle (4).
  7. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei eine axiale Ausrichtung (60) der Vielzahl von Öffnungen (9) jeweils einen Winkel (44) von etwa 90 Grad in Bezug auf eine Ebene einer Innenfläche (45) der Laufradnabe (34) an einer Position jeder entsprechenden Öffnung (9) definiert.
  8. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei die Laufradnabe (34) einen ersten Teil (40) und einen zweiten Teil (41) umfasst, wobei der erste und der zweite Teil (40, 41) aneinander befestigt sind und wobei die Vielzahl von Öffnungen (9) in dem ersten Teil (40) angeordnet ist und die Flügelradblätter (31) an dem zweiten Teil (41) befestigt sind.
  9. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei ein Abstand (21) zwischen der ersten axialen Position und der zweiten axialen Position 400 bis 4000 mm, speziell 500 bis 3000 mm, in der axialen Richtung (5) der drehbaren hohlen Welle (4), beträgt.
  10. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei die drehbare hohle Welle (4) eine oder mehrere erste Wellensektionen (22, 23), die sich von dem ersten Endbereich (14) der drehbaren Welle (4) bis zu einem ersten axialen Ende (25) des ersten Flügelrades (7) erstrecken, und eine zweite Wellensektion (24), die sich von einem zweiten axialen Ende (26) des ersten Flügelrades (7) bis zu einem ersten axialen Ende (27) des zweiten Flügelrades (8) erstreckt, umfasst.
  11. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei das erste Flügelrad (7) frei von Öffnungen ist, die zum Sprühen einer Reinigungsflüssigkeit konfiguriert sind.
  12. Rühreranordnung nach einem der vorhergehenden Ansprüche, wobei das zweite Flügelrad (8) ferner mindestens eine zusätzliche Öffnung (70) für jedes Blatt (31) des zweiten Flügelrades (8) und konfiguriert zum Sprühen einer Reinigungsflüssigkeit auf die Blätter (31) des zweiten Flügelrades (8) umfasst.
  13. Rühreranordnung nach einem der vorhergehenden Ansprüche, die ferner ein drittes Flügelrad umfasst, das an einer dritten axialen Position an der Welle (4) befestigt ist, wobei
    - das dritte Flügelrad eine Vielzahl von Öffnungen umfasst, die dafür konfiguriert sind, eine Reinigungsflüssigkeit auf das erste und/oder das zweite Flügelrad (7, 8) zu sprühen, um das erste und/oder das zweite Flügelrad (7, 8) zu reinigen, oder
    - das dritte Flügelrad frei von Öffnungen ist, die zum Sprühen einer Reinigungsflüssigkeit konfiguriert sind.
  14. Mischtank, der eine Rühreranordnung nach einem der vorhergehenden Ansprüche einschließt, wobei das erste Flügelrad (7) oberhalb des zweiten Flügelrades (8) angeordnet ist.
EP18177890.3A 2018-06-15 2018-06-15 Rühreranordnung Active EP3581262B1 (de)

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CN111821888A (zh) * 2020-07-30 2020-10-27 陶伟 一种具有良好清洁能力的自动化肥水混合装置
CN112007554A (zh) * 2020-08-14 2020-12-01 佛山职业技术学院 一种食品加工用注水搅拌装置
CN112372871B (zh) * 2020-10-22 2022-07-01 安徽美高美高分子材料有限公司 一种亚克力板原料混合搅拌装置
CN113865330B (zh) * 2021-10-09 2022-10-11 重庆医药高等专科学校 一种灭菌干燥一体机

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JPH09117654A (ja) * 1995-10-24 1997-05-06 Ishikawajima Harima Heavy Ind Co Ltd 攪拌槽の洗浄装置
JP5764182B2 (ja) * 2013-11-15 2015-08-12 株式会社神鋼環境ソリューション メタン発酵槽の撹拌装置からし渣を除去する方法、及び撹拌装置からし渣を除去することが容易なメタン発酵槽
CN207169685U (zh) * 2017-05-06 2018-04-03 浙江百辰食品科技有限公司 一种化工用反应釜
CN206980591U (zh) * 2017-07-27 2018-02-09 浙江长江搅拌设备有限公司 一种自洁式搅拌机

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