EP2926892B1 - Rührgerät - Google Patents

Rührgerät Download PDF

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Publication number
EP2926892B1
EP2926892B1 EP14305498.9A EP14305498A EP2926892B1 EP 2926892 B1 EP2926892 B1 EP 2926892B1 EP 14305498 A EP14305498 A EP 14305498A EP 2926892 B1 EP2926892 B1 EP 2926892B1
Authority
EP
European Patent Office
Prior art keywords
blade
rotation
stirring member
angle
axis
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.)
Not-in-force
Application number
EP14305498.9A
Other languages
English (en)
French (fr)
Other versions
EP2926892A1 (de
Inventor
Frederic Savreux
Patrice Cognart
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.)
Milton Roy Europe SA
Original Assignee
Milton Roy Europe SA
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 Milton Roy Europe SA filed Critical Milton Roy Europe SA
Priority to EP14305498.9A priority Critical patent/EP2926892B1/de
Priority to ES14305498T priority patent/ES2860465T3/es
Priority to CN201580021902.6A priority patent/CN106457175A/zh
Priority to US15/301,559 priority patent/US10105663B2/en
Priority to SG11201608304TA priority patent/SG11201608304TA/en
Priority to PCT/EP2015/056951 priority patent/WO2015150353A1/fr
Publication of EP2926892A1 publication Critical patent/EP2926892A1/de
Application granted granted Critical
Publication of EP2926892B1 publication Critical patent/EP2926892B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
    • B01F27/1134—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller the impeller being of hydrofoil type
    • 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
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
    • 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
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0422—Numerical values of angles

Definitions

  • the present invention relates to a stirring mobile comprising at least two blades and capable of being fixed to a rotation shaft.
  • the set therefore consists of a container, a product and a stirrer.
  • the present invention relates to the design of agitators which are generally propellers or turbines comprising a so-called agitation mobile mounted on a rotation shaft.
  • a turbine is provided with straight blades at 90 ° relative to the vertical, it is however customary to call an entirely mobile turbine made up of straight blades, even positioned inclined.
  • a turbine generates a radial flow, which generates shear and dissipates energy.
  • a helix is preferably formed from a pitch portion of a helical, strongly inclined, of a bent or bent sheet metal.
  • a propeller develops an axial and methodical flow.
  • the rotation of the agitation mobile causes a displacement of the liquid which makes it possible to carry out the desired operation, more or less efficiently depending on the shape of the mobile, its size and the speed of rotation.
  • Rotation can also cause shear and dissipate energy in the liquid to be mixed.
  • the invention deals more specifically with the case where it is sought to minimize the energy losses by shearing in order to obtain a displacement of the liquid and its mixing with low losses, which implies a high efficiency.
  • a stirring mobile comprising three blades and able to be fixed on a rotation shaft, each blade comprising a leading edge facing the fluid to be stirred and a trailing edge opposite the leading edge, in which each blade is obtained by bending a flat sheet, where each blade has two substantially longitudinal folds over the major part of the blade and intersecting at the distal end of the blade, and in which the leading edge has an angle of incidence positive in its proximal part and a negative angle of incidence in its distal part.
  • US 2005/243646 A1 also describes another motive for agitation.
  • each ply may be greater than 75% of the maximum radius of the blade.
  • the two folds are parallel.
  • At least one of the folds may be perpendicular to the outer edge of the helix.
  • the angle between the leading edge and the radial axis of the blade passing through the center of rotation and perpendicular to the outer edge, called the angle of incidence, is positive, the distal end of the outer edge, away from the shaft, attacking the fluid before the proximal end, when the mobile is rotating.
  • the angle of incidence is between 6 and 15 °.
  • the stirring mobile comprises only two blades so as to facilitate its introduction through the opening of the container of the fluid to be stirred.
  • Each blade may have, due to the presence of the two folds, a cross section substantially U-shaped in a plane parallel to the axis of rotation of the mobile and parallel to the outer edge of the blade.
  • each blade can also be substantially Z-shaped in a plane parallel to the axis of rotation of the mobile and parallel to the outer edge of the blade.
  • the trailing edge may have an angle of between 30 and 70 ° with the intersection with the section plane of a plane orthogonal to the axis of rotation of the mobile, this angle being called the angle of flight.
  • l the width of the blade at its distal end and L the width of the blade at its base at the level of the axis, then l> 0.5 L.
  • the angle of attack a between the side comprising the leading edge and the central side is between 13 and 25 °.
  • Fig. 2 to 4 a first embodiment of a propeller according to the invention, produced with 2 plies, an inexpensive solution that can be produced using tools available to most mechanical-boiler workshops.
  • each blade of the propeller has two folds, each blade therefore has three sides and in a sectional view, it is necessary to define three angles to define the profile of the blade. These angles are more particularly visible Fig. 4 .
  • the angle of attack is the angle a between the side comprising the leading edge and the central side.
  • the angle d is the positioning angle between the pan center of the blade and horizontal, when the axis of rotation is vertical.
  • the angle of flight f is the angle between the side comprising the trailing edge and the central side.
  • This propeller has an angle of attack a and a flight angle f of 21 °.
  • the first fold A that is to say the one which will attack the fluid first, is made along an axis passing through the axis of rotation of the propeller.
  • the second fold is denoted B. It can be noted that the distal end of the trailing edge is situated forward with respect to the proximal end of this same trailing edge and to the direction of rotation of the helix. The distal end will therefore attack the fluid first.
  • the blades are bent so as to obtain a camber coefficient of less than 12%, so as to improve energy efficiency.
  • the angle of attack is between 13 and 22 ° in order to have a suitable Cx. Indeed beyond 30 ° the generated radial forces will be very important. We then approach the case of the turbine.
  • the blade area is generous and almost quadrilateral-shaped, in order to obtain a high pumping rate because the volume displaced is a function of the surface of the blade.
  • the sizes l and L are very similar and l> 0.5 L and preferably l> 0.75 L.
  • Nq adimensional number characterizing the propeller (its shape, the number of blades etc ).
  • Np adimensional number characterizing the propeller (its shape, the number of blades etc ).
  • the efficiency is the ratio of the energy providing the pumping flow rate and the energy required to turn the mobile.
  • the number of propeller blades increases the quantity of liquid displaced but also the power consumed.
  • the installation of the propeller is easier. Indeed, depending on the diameter of the shaft, it is sometimes not possible to install three blades around it.
  • the propeller can be made in one part for various reasons, for example welded to the drive shaft to allow its possible coating in a corrosive or abrasive medium or when it is not possible to fix it subsequently.
  • the three-bladed propeller is particularly difficult to introduce in a pipe when the mobile exceeds 500 mm, but a two-blade propeller of the same diameter is easily inserted as illustrated Fig. 5 and 6 .
  • the propeller is sought after for its flow leaving the rather axial blade in order to blow towards the bottom in the axis and to go up to the wall, to sweep the bottom of any deposited particles.
  • the manufacture of the proposed propellers is relatively easy using a folding machine, so we can talk about a better competitive subcontractors, a greater choice of them.
  • the mechanical determination of a stirrer is dictated by its diameter and its speed of rotation for a given operation and consequently by the power generated for the rotation of the mobile.
  • the gain in power for the same pumping rate allows a gain on the engine, the speed reducer transmitting the torque, on the guidance system and on the sealing, the mobile carrier shaft and the thickness of the mobile. For example, there is a gain of 20% in power between the proposed propeller and a marine propeller.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Claims (12)

  1. Rührvorrichtung (M) mit mindestens zwei Schaufelblättern und dazu geeignet, auf einer Drehachse befestigt zu werden, wobei jedes Blatt eine Anströmkante hat, die in Richtung der anzugreifenden Flüssigkeit weist, und eine Abströmkante, die in die der Anströmkante entgegengesetzten Richtung weist,
    wobei jedes Blatt durch Biegen eines ebenen Blechs erhalten wird,
    jedes Blatt zwei längsgerichtete Biegekanten umfasst, wobei die Länge jeder Biegekante länger als 60% des maximalen Blattradius ist,
    der Winkel zwischen der Anströmkante und der radialen Achse des Blatts, die durch den Drehpunkt verläuft und senkrecht zur Außenkante ist, als Einfallswinkel bezeichnet wird und positiv in dem Sinne ist, als dass das distale, von der Drehachse entfernte Ende der Außenkante die Flüssigkeit vor dem proximalen Ende angreifen kann, wenn die Rührvorrichtung in Drehung versetzt ist,
    bei der beide Biegekanten parallel zueinander sind und der Einfallswinkel zwischen 6 und 15° liegt.
  2. Rührvorrichtung (M) nach Anspruch 1, dadurch gekennzeichnet, dass die Länge jeder Biegekante größer als 75% des maximalen Blattradius ist.
  3. Rührvorrichtung (M) nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass mindestens eine der Biegekanten senkrecht zur Außenkante des Propellers verläuft.
  4. Rührvorrichtung (M) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie nur zwei Schaufelblätter umfasst.
  5. Rührvorrichtung (M) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass jedes vorhandene Schaufelblatt durch die Präsenz der beiden Biegekanten einen Querschnitt hat, der eine deutliche U-Form in einer Ebene parallel zur Drehachse der Rührvorrichtung und parallel zur Außenkante des Blatts aufweist.
  6. Rührvorrichtung (M) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass jedes vorhandene Schaufelblatt durch die Präsenz der beiden Biegekanten einen Querschnitt hat, der eine deutliche Z-Form in einer Ebene parallel zur Drehachse der Rührvorrichtung und parallel zur Außenkante des Blatts aufweist.
  7. Rührvorrichtung (M) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Abströmkante einen Winkel von 30 bis 70° zur Schnittstelle der Schnittebene mit einer Ebene senkrecht zur Drehachse der Rührvorrichtung hat, wobei dieser Winkel als Abströmwinkel bezeichnet wird.
  8. Rührvorrichtung (M) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass, wenn man die Schaufelblattbreite an seinem distalen Ende als l bezeichnet und als L die Schaufelblattbreite an seiner Basis auf der Ebene der Drehachse, l >0,5 L beträgt.
  9. Rührvorrichtung (M) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass für jedes Schaufelblatt der Anströmwinkel a zwischen der Fläche, die die Anströmkante enthält, und der mittleren Fläche zwischen 13 und 25° beträgt.
  10. Rührvorrichtung (M) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass, wenn man die Schaufelblattbreite an seinem distalen Ende als l bezeichnet und als L die Schaufelblattbreite an seiner Basis auf der Ebene der Drehachse, l >0,75 L beträgt.
  11. Rührvorrichtung (M) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste Biegekante (A), das heißt diejenige, welche die Flüssigkeit als erste angreifen wird, entlang einer Achse verwirklicht ist, die durch die Drehachse der besagten Rührvorrichtung verläuft.
  12. Rührvorrichtung (M) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das distale Ende der Abströmkante im Vergleich zum proximalen Ende dieser gleichen Abströmkante und in Drehrichtung des Propellers weiter vorn liegt, wobei das besagte distale Ende auf diese Weise die Flüssigkeit als erstes angreift.
EP14305498.9A 2014-04-04 2014-04-04 Rührgerät Not-in-force EP2926892B1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP14305498.9A EP2926892B1 (de) 2014-04-04 2014-04-04 Rührgerät
ES14305498T ES2860465T3 (es) 2014-04-04 2014-04-04 Móvil de agitación
CN201580021902.6A CN106457175A (zh) 2014-04-04 2015-03-31 搅拌螺旋桨
US15/301,559 US10105663B2 (en) 2014-04-04 2015-03-31 Stirring propeller with blades made of sheet bent along two longitudinal bends
SG11201608304TA SG11201608304TA (en) 2014-04-04 2015-03-31 Stirring propeller
PCT/EP2015/056951 WO2015150353A1 (fr) 2014-04-04 2015-03-31 Helice d'agitation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14305498.9A EP2926892B1 (de) 2014-04-04 2014-04-04 Rührgerät

Publications (2)

Publication Number Publication Date
EP2926892A1 EP2926892A1 (de) 2015-10-07
EP2926892B1 true EP2926892B1 (de) 2021-01-13

Family

ID=50513861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14305498.9A Not-in-force EP2926892B1 (de) 2014-04-04 2014-04-04 Rührgerät

Country Status (6)

Country Link
US (1) US10105663B2 (de)
EP (1) EP2926892B1 (de)
CN (1) CN106457175A (de)
ES (1) ES2860465T3 (de)
SG (1) SG11201608304TA (de)
WO (1) WO2015150353A1 (de)

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WO2017212935A1 (ja) * 2016-06-09 2017-12-14 プライミクス株式会社 攪拌羽根および攪拌装置
WO2019014709A1 (en) * 2017-07-17 2019-01-24 Commonwealth Scientific And Industrial Research Organisation MIXING APPARATUS AND METHOD OF OPERATING THE SAME
CN109045745B (zh) * 2018-08-10 2021-08-24 自然资源部天津海水淡化与综合利用研究所 一种带提升导流的连续真空冷却结晶装置
CN109701412B (zh) * 2019-03-10 2021-07-30 辽宁石油化工大学 一种用于球形储油罐的均质装置
CN112426904B (zh) * 2020-12-10 2022-06-21 江西睿锋环保有限公司 一种用于废锌回收处理工艺的搅拌装置
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Publication number Publication date
WO2015150353A1 (fr) 2015-10-08
ES2860465T3 (es) 2021-10-05
CN106457175A (zh) 2017-02-22
US10105663B2 (en) 2018-10-23
EP2926892A1 (de) 2015-10-07
SG11201608304TA (en) 2016-11-29
US20170113196A1 (en) 2017-04-27

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