EP0912235B1 - Vorrichtung zum mischen von medien - Google Patents
Vorrichtung zum mischen von medien Download PDFInfo
- Publication number
- EP0912235B1 EP0912235B1 EP96920081A EP96920081A EP0912235B1 EP 0912235 B1 EP0912235 B1 EP 0912235B1 EP 96920081 A EP96920081 A EP 96920081A EP 96920081 A EP96920081 A EP 96920081A EP 0912235 B1 EP0912235 B1 EP 0912235B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- housing
- media
- mixing
- mixing housing
- 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.)
- Expired - Lifetime
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Definitions
- the present invention relates to a device for mixing of two or several media.
- these kinds of devices are made as a type of vessel into which different media are fed and exposed to agitation by means of rotating or revolving stirrers. Usually the media are fed in continuously and the mixture is also discharged continuously. If the mixing takes place under high pressures the vessel has to be made as a pressure vessel and if the media are highly corrosive all parts, in contact with or exposed to the media, have to be made of materials resistive to corrosion.
- Conventional mixers normally function satisfactorily, but are restricted to media which are relatively easy to mix. This is a disadvantage as a wide range of use would be preferable for the often very big and expensive mixers that are used, in the first place, within the process industry. When these mixers are made to resist highly corrosive media they tend to be even more expensive.
- the type of mixer is intended for use in ordinary mixing applications, when only a very effective degree of mixing is to be obtained, and also for very difficult applications in continuous processes with lignocellulosic material as media.
- the mixer will be able to operate highly viscosic media, such as suspensions of lignocellulosic fibres in water, with a concentration of dry substance as high as approximately 35 %.
- highly viscosic media such as suspensions of lignocellulosic fibres in water, with a concentration of dry substance as high as approximately 35 %.
- cellulosic fibres have the ability to form a network unaided, a so called network of fibre, at relatively low consistencies. This leads to a rapid decrease in the mixtures ability to flow, like a "Newtonian liquid”. If this phenomena cannot be overcome or eliminated it will strongly effect the result in a negative way when mixing additives like, bleaching chemicals, oxygen, acids, etc.
- Acid hydrolysis of lignocellulosic materials can be used as an example. If a strong network of fibre exists, the added acid will not be distributed to the medium in an satisfactory way for this process.
- the network of fibre should be broken so that all the individual fibres can be reached rapidly by the acid. This can be achieved by an agitation of the fibre suspension strong enough to fluidize the mixture.
- the mixture will than start to behave like a "Newtonian liquid", which will allow a proper and homogeneous addition of the acid.
- the transport of the mixture through the mixer will also be facilitated.
- the mixer will also be constructed so that it can be equipped with an internal cover of special material as a protection from corrosion, without being too complicated or in any other way leading to unreasonable costs.
- the purpose of the invention is to achieve a mixer which is unsophisticated, effective and easy to facilitate, and which also complies with above mentioned requirements.
- the housing of the mixer has a straight cylindrical form and the media, that should be mixed, are fed in through an opening in the mantle surface, essentially radial to the housing, where the media immediately in the opening are subject to a first mixing, or agitation, by the axial bars that sweep close to the inner wall of the cylindrical mixing housing.
- the media are transported perpendicular to the intake direction and are subject to at least one more mixing or agitation, but now perpendicular to the first mixing, by a rotating rotor cross with radial arms located in the open end of the mixing housing, coaxial with the housing. This especially contributes to a strong turbulence of the media mixture.
- the device consists of three main parts, namely one straight cylindrical mixing housing 1, one straight cylindrical bearing housing 2 and one electrical motor 3, positioned at the end of the bearing housing. These three parts are connected to each other by flanges.
- a feed pipe 4 is welded at an opening 5 through the cylindrical wall 6 of the mixing housing.
- a revolvable rotor 7 is arranged inside the mixing housing 1 .
- the rotor has one rotor cross, with radial arms 8, at the outlet opening 9 of the housing 1 and a similar rotor cross 10 at the other end of the housing 1, and the ends of the arms 8 are connected to the ends of the arms of the rotor cross 10 by four axial bars 15 which sweep along the inside of the housing 1 when the rotor is rotating.
- the rotor cross 10 is fixed to a shaft 11 which goes through an opening in the end wall 12 of the bearing housing 2. End wall 12 is also, at the same time, the end wall of the mixing housing 1.
- the shaft 11 is supported by the bearings 13 in the bearing housing 2 and is connected to the motor 3 by a coupling 14.
- the rotor cross 10 has arms which are somewhat inclined to feed the media from the end wall 12, as are the bars 15, to feed the media from the inside of the wall 6 against the centre of the housing 1. Furthermore the axial bars 15 can be designed slightly curved to support the feed of the media through the housing 1 forwards the outlet opening 9.
- the arms 8, of the rotor cross in the outlet opening 9, are twisted and/or curved causing a strong turbulence when the media is passing.
- one or several more rotor crosses can be arranged at the rotor 7 between the two which are shown in the drawing.
- the axial part of the housing has a diameter of 350 mm and a length of 600 mm.
- the inlet pipe 4 has a diameter of 325 mm.
- the housing 1 and the inlet pipe 4 are made of stainless steel and the inside are lined with a 4 mm thick plate of Zirconium 16.
- the rotor 7 is manufactured of solid Zirconium and the design gives the suitable stability and strength to take the full torque that the motor 3 can give.
- This motor has an effect of 75 kW and a speed of 750 rpm, which gives the rotor a circumferential speed of 13,5 m/s.
- the arms of the rotor crosses can be more or less than four.
- the ends of the arms can be connected by a circular reinforcement if increased rigidity of the rotor is desired.
Landscapes
- Mixers Of The Rotary Stirring Type (AREA)
Claims (5)
- Vorrichtung zum Vermischen von von zwei oder mehreren Medien, die der Vorrichtung zugeführt werden, mit einem geraden zylindrischen Mischgehäuse (1), in welchem ein Rotor (7) mit Hilfe eines Lagergehäuses (2) eingreift, das an einem Ende des Mischgehäuses (1) angebracht ist, das am anderen Ende eine axial ausgerichtete Einlaß- oder Auslaßöffnung (9) besitzt, wobei der Rotor, der durch eine Antriebswelle (11) angetrieben ist, mit wenigstens zwei Rotorkreuzen ausgerüstet ist, einem ersten Rotorkreuz (10), das in der Nähe des Lagergehäuses angeordnet ist, und einem zweiten Rotorkreuz (8), das an der Auslaß- oder Einlassöffnung (9) angeordnet ist, die Rotorkreuze radiale Arme (8) besitzen und die Enden des ersten Rotorkreuzes (10) mit den entsprechenden Enden des zweiten Rotorkreuzes mit axialen Gliedern (15) verbunden sind, die derart angeordnet sind, daß sie entlang der Innenseite des zylindrischen Teils des Mischgehäuses (1) streichen, wobei die Vorrichtung ferner eine Einlaß- oder Auslaßöffnung (5) für die Medien aufweist, die an der zylindrischen Wandung (6) des Mischgehäuses angeordnet ist.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die radialen Arme (8) der Rotorkreuze derart geneigt sind, daß die Medien durch die Arme des ersten Rotorkreuzes (10) zu der Auslaßöffnung (9) geführt und ihnen durch die Arme des zweiten Rotorkreuzes (8) starke Turbulenzen verliehen werden.
- Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Lagergehäuse (2) eine Stirnwand (12) besitzt, die gleichzeitig eine Stirnwand des Mischgehäuses (1) bildet.
- Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Axialglieder (15) etwas geneigt befestigt sind, um die Innenseite des zylindrischen Teils des Mischgehäuses (1) sauber zu halten.
- Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Axialglieder (15) leicht gekrümmt sind, um die Umfangszonen der Medien vorwärts entlang der zylindrischen Innenseite des Mischgehäuses (1) zu fördern.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE1996/000488 WO1997038788A1 (en) | 1994-10-21 | 1996-04-16 | Apparatus for mixing of media |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0912235A1 EP0912235A1 (de) | 1999-05-06 |
EP0912235B1 true EP0912235B1 (de) | 2001-12-19 |
Family
ID=20401342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96920081A Expired - Lifetime EP0912235B1 (de) | 1996-04-16 | 1996-04-16 | Vorrichtung zum mischen von medien |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0912235B1 (de) |
DE (1) | DE69618249T2 (de) |
-
1996
- 1996-04-16 EP EP96920081A patent/EP0912235B1/de not_active Expired - Lifetime
- 1996-04-16 DE DE69618249T patent/DE69618249T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69618249T2 (de) | 2002-08-14 |
DE69618249D1 (de) | 2002-01-31 |
EP0912235A1 (de) | 1999-05-06 |
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