SE421047B

SE421047B - Method for the continuous mixing of liquid and powder to form a largely homogeneous mixture and arrangement for carrying out the method

Info

Publication number: SE421047B
Application number: SE7903053A
Authority: SE
Inventors: Nemo Ivarson
Original assignee: Nemo Ivarson
Priority date: 1979-04-05
Filing date: 1979-04-05
Publication date: 1981-11-23
Also published as: SE7903053L

Abstract

Method and arrangement for the continuous mixing of liquid and powder into a largely homogeneous mixture. The liquid and the powder are supplied via separate lines 22, 21 to a cavity 7 in a rotating wheel 3, 4 and a powder space 13 in the rotating wheel 3, 4 and are flung by centrifugal force outward against the periphery of the wheel. The liquid is pressed from the cavity 7 via a slot 8, 9 in the wheel in the direction of the top of the wheel and forms a fog screen upon emerging from the slot. This fog screen captures the powder grains flung out by centrifugal force from the powder spaces 13 and forms a mixture with them. <IMAGE>

Description

7903053-2 bindelse med hjulets ovansida via en runtom gående spalt som myn- nar intill en på periferisidan om spalten liggande likaledes runt- om gående egg, varvid spaltens form motsvarar i huvudsak formen hos mantelytan i en stympad kon med spetsen riktad nedåt, varjäm- te blandarhuset innefattar blandarstift som är anordnade att upp- fånga vätska från dimridån och utslungat pulver från pulverutrym- mena för åstadkommande av blandningen. 7903053-2 connection to the top of the wheel via a circumferential slot adjacent to one on the peripheral side of the gap lying likewise round about walking edge, the shape of the gap substantially corresponding to the shape of the mantle surface in a truncated cone with the tip pointing downwards, The mixing housing comprises mixing pins which are arranged to be capture liquid from the mist curtain and ejected powder from the powder compartment mean for effecting the mixture.

*Bland de fördelar som vinnes medelst uppfinningen kan_nämnas bland annat att ett konstant förhållande mellan pulverandel och _ vätskeandel kan bibehållas under hela blandningsoperationen, vilket är mycket väsentligt exempelvis vid framställning av blandningar inom läkemedelsindustrin. Förhållandet mellan pul- ver och vätska kan inställas godtyckligt för varje speciell bland- ning. Vidare arbetar anordningen enligt uppfinningen kontinuer- ligt till skillnad från kända anordningar där en "degklump" blan- das åt gången exempelvis vid s.k. "batchníng".* Among the advantages gained by the invention may be mentioned among other things, that a constant ratio between powder content and liquid content can be maintained throughout the mixing operation, which is very important, for example, in the production of mixtures in the pharmaceutical industry. The ratio of pulses and liquid can be set arbitrarily for each particular mixture. ning. Furthermore, the device according to the invention operates continuously. Unlike known devices where a "dough lump" is mixed das at a time, for example at so-called "batch".

Uppfinningen beskrivs i detalj i det följande under hänvis- ning till bifogade ritning på vilken en utföringsform av en anord- ning enligt uppfinningen är schematiskt åskådliggjord såsom exem- pel.The invention is described in detail in the following with reference to to the accompanying drawing in which an embodiment of a device according to the invention is schematically illustrated as an example. pel.

Pig. 1 visar en vertikalsektíon genom anordningen enligt uppfinningen. Pig. 2 visar en sektion utefter linjen II-II i fig. l. Pig. 3 visar en del av vertikalsektionen i fig. 1 i större skala. Lika delar i de olika figurerna har samma hänvis- ningsbeteckningar. 7 I I Den på ritningen visade anordningen har ett blandarhus 1 med lock 2. Inuti huset l är anordnat ett hjul, bestående av ett överhjul 3 och ett underhjul 4, som är roterbart lagrat omkring en axel 5 medelst lager 6. Mellan över- och underhjulen 3 resp.Pig. 1 shows a vertical section through the device according to the invention. Pig. 2 shows a section along the line II-II in Fig. 1. Pig. Fig. 3 shows a part of the vertical section in Fig. 1 in larger scale. Similar parts in the different figures have the same reference designations. 7 I I The device shown in the drawing has a mixer housing 1 with lid 2. Inside the housing 1 is arranged a wheel, consisting of one upper wheel 3 and a lower wheel 4, which is rotatably mounted around a shaft 5 by means of bearing 6. Between the upper and lower wheels 3 resp.

H finns ett hålrum 7 som har förbindelse med överhjulets 3 ovan- sida via en runt om gående spalt bestående av tvâ partier 8 och 9 som båda har formen av mantelytan hos var sin stvmpad kon med spetsen riktad nedåt. Överhjulet 3 har på sin ovansida utfrästa skovlar 10 och på sin undersida utfrästa skovlar ll. Mellan \ skovlarna 10 uppstår utrymmen 13 som är avsedda att mottaga pulv- ret för blandningen medan hålrummet 7 som är uppdelat i fack me- delst skovlarna ll är avsett att mottaga den vätska som skall an- vändas vid blandningen. Underhjulet H har en runt om gående egg lä intill mynningen av spalten 9. Vid sin periferi är det undre __ 7903053-2 hjulet U försett med skovlar 15 för utslungning av den färdiga blandningen via en diffusor 16 och utloppet l7. Utloppet kan eventuellt kompletteras med ett munstycke 18 som användes när den färdiga blandningen är mera lättflytande. Locket 2 har ett över hjulets centrum liggande fack 19 för mottagande av pulverfa- sen för vidare transport av denna till utrvmmena 13. Locket är vidare på sin undersida försett med stift 70 som ligger intill eggen ln. Pulverfasen matas tjll_fagket eller utrymmet 19 med _______ U hjälp av en transportör 21, exempelvis en matarskruv. Vätskefa- sen tíllföres till hålrummet 7 genom ett rör 22.H there is a cavity 7 which is connected to the upper part of the upper wheel 3. side via a circumferential column consisting of two parts 8 and 9 which both have the shape of the mantle surface of each with its truncated cone the tip directed downwards. The upper wheel 3 has milled on its upper side vanes 10 and on its underside milled vanes ll. Between \ vanes 10, spaces 13 are formed which are intended to receive powder for the mixture while the cavity 7 which is divided into compartments the vanes 11 are intended to receive the liquid to be used turned in the mixture. The lower wheel H has a circumferential edge lay next to the mouth of the column 9. At its periphery it is lower __ 7903053-2 the wheel U is provided with vanes 15 for throwing out the finished one the mixture via a diffuser 16 and the outlet 17. The outlet can optionally supplemented with a nozzle 18 used when the finished mixture is more fluid. The lid 2 has one compartment 19 lying above the center of the wheel for receiving powder powder then for further transport of this to the compartments 13. The lid is further on its underside provided with pin 70 adjacent eggen ln. The powder phase is fed tjll_fagket or space 19 with _______ U by means of a conveyor 21, for example a feed screw. Fluid- then fed to the cavity 7 through a tube 22.

Vid blandningsoperntionen roterar hjulet 3,H inuti huset 1,? runt axeln 5 med ett varvtal som kan ligga mellan lÛ0n och 5000 varv per minut. Våtfasen eller vätskan tillföras därvid till blandaren via röret 22 till hålrummet 7. Med hjälp av cen- trifugalkraften och skovlarna ll slungas vätskan utåt genom spalten 8 och vidare genom spalten 9. Vätskan har därvid formen av en hinna som utvidgar sig utåt hela tiden samtidigt som den blir tunnare. När vätskehinnan lämnar spalten 9 träffar den eg- gen lH och slites därvid sönder till mikroskopiska droppar så att en dimridå bildas. Samtidigt med tillförsel av vätskan ge- nom röret 22 tillföres pulver medelst transportören 21 till facket 19 och vidare till utrymmena 13. Därifrån slungas pulv- ret med hjälp av centrifugalkraften och skovlarna 10 utåt mot överhjulets 3 periferi samtidigt som det sönderpískas och träf- far dimridån vid eggen lä. De båda faserna, vätska och pulver, slungas nu vidare utåt tillsammans och kolliderar med stiften 20 där den momentana blandningen sker. Den färdiga blandningen upp- fångas omedelbart av skovlarna 15 som slungar ut blandningen via diffusorn l6 till utloppet 17. Granulat och styva blandningar lämnar blandaren vid utloppet l7 medan vid mera lättflytande pro- dukter blandningen uttages via munstycket 18.At the mixing operation, the wheel 3, H rotates inside the housing 1 ,? around the axis 5 at a speed which may be between lÛ0n and 5000 rpm. The wet phase or liquid is then added to the mixer via the tube 22 to the cavity 7. By means of the trifugal force and the vanes ll the liquid is thrown outwards through column 8 and further through column 9. The liquid then has the shape of a membrane that expands outward all the time at the same time as it becomes thinner. When the liquid membrane leaves the gap 9, it hits the gene lH and thereby breaks down into microscopic droplets so that a fog curtain is formed. At the same time as the supply of the liquid through the tube 22 powder is supplied by means of the conveyor 21 to the compartment 19 and on to the spaces 13. From there the powder by means of the centrifugal force and the vanes 10 outwards the periphery of the upper wheel 3 at the same time as it is whipped and far the fog curtain at the edge lä. The two phases, liquid and powder, is now thrown further outwards together and collides with the pins 20 where the instantaneous mixing takes place. The finished mixture is is immediately captured by the vanes 15 which eject the mixture via diffuser l6 to outlet 17. Granules and stiff mixtures leaves the mixer at outlet 17 while at more fluid flow- pro- The mixture is taken out via the nozzle 18.

Uppfinningen är inte begränsad till den speciella i det fö- regående beskrivna utföringsformen utan omfattar alla utförings- former inom ramen för patentkraven. Speciellt bör vad gäller ut- trycken “hålrum" och "pulverutrvmme" observeras att det som be- tecknats såsom "ett hälrum" i princip kan sägas bestå av "flera hålrum" och att det som angetts vara "pulverutrymmen" lika väl kan sägas utgöra Vett pulverutrvmme".The invention is not limited to the particular one in the present invention. described as described above but includes all embodiments forms within the scope of the claims. In particular, with regard to the pressures "cavity" and "powder space" are observed that what is drawn as "a heel space" can in principle be said to consist of "several cavities "and that what is stated to be" powder spaces "as well can be said to constitute Vett powder powder ".

Claims

7903053-2 4 Patent claims

When mixing liquid and powder continuously, make a substantially homogeneous mixture, characterized in that the liquid and powder are fed via separate lines to a cavity in a rotating mixer wheel and powder spaces in the mixer wheel and thereby thrown by the centrifugal force outwards towards the wheel. periphery, the liquid being forced from the cavity via a gap in the wheel towards the top of the wheel and thrown at the exit from the wheel against an circumferential edge on the peripheral side of the gap, thereby forming a fog curtain which catches the powder grains ejected by centrifugal force, of liquid and powder grains are thrown further outwards towards the periphery of the wheel and are caught by mixing pins in the housing of the mixing wheel to form a homogeneous mixture which is fed towards the outlet of the mixing housing.

Device for carrying out the method according to claim 1, consisting of a mixer and a mixer housing (1,2) and with separate lines (21, 22) for supplying liquid and powder, characterized in that the mixer housing comprises a wheel (3,4) which is rotatable about an axis (5) in the mixing housing (1,2), the liquid line (22) opening into a cavity (7) in the wheel while the powder line opens into the powder spaces (13) in the wheel upper part, and the cavity (7) communicates with the upper side of the wheel via a circumferential gap (8,9) which opens next to a circumferentially circumferential edge (lä) lying on the peripheral side of the gap, the shape of the gap substantially corresponding to the shape of the mantle surface in a truncated cone with the tip directed downwards, furthermore the mixing housing (1,2) comprises mixing pins (20) which are arranged to catch liquid from the mist curtain and ejected powder from the powder spaces to effect the mixing.

Device according to claim 2, characterized in that the powder spaces (13) in the upper part of the wheel are delimited from each other by means of vanes (10) which are directed outwards from the center of the wheel. I _ _

Device according to claim 2 or 3, characterized in that the cavity (7), which lies around the center of the wheel, is divided into different compartments by means of vanes (II) which are directed outwards from the center of the wheel. _

Device according to any one of claims 2 - H, characterized by the cone-shaped gap consisting of a lower (8) and an upper (9) cone-shaped part, the lower one of which has a more blunt tip angle than the upper one.