EP0478497B1 - Static mixer with tubelike housing - Google Patents

Static mixer with tubelike housing Download PDF

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Publication number
EP0478497B1
EP0478497B1 EP91810656A EP91810656A EP0478497B1 EP 0478497 B1 EP0478497 B1 EP 0478497B1 EP 91810656 A EP91810656 A EP 91810656A EP 91810656 A EP91810656 A EP 91810656A EP 0478497 B1 EP0478497 B1 EP 0478497B1
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EP
European Patent Office
Prior art keywords
mixer according
plastic tube
sealing surface
mixer
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
Application number
EP91810656A
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German (de)
French (fr)
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EP0478497A1 (en
Inventor
Arno Signer
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.)
Sulzer Chemtech AG
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Sulzer Chemtech AG
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Publication of EP0478497A1 publication Critical patent/EP0478497A1/en
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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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor

Definitions

  • the invention relates to a static mixer with a tubular housing, at least one mixing element arranged therein and end connections on both sides.
  • Such mixers are used for the continuous mixing, dispersing and homogenizing of hardeners, additives, accelerators, reactors and paints in resins, adhesives and sealants. This means that mixing performance can be achieved with a low weight and low volume of the mixer with good reproducibility of the mixing quality and low heat input.
  • Such mixing devices are e.g. known from CH-A-642 564.
  • This object is achieved according to the invention with a static mixer according to claim 1.
  • the interchangeable plastic pipe, to which the material to be mixed does not stick, enables the mixer to be easily dismantled into its individual parts and thus simple cleaning and reuse of the mixing elements with a new plastic pipe.
  • the annular sealing surface seals the carrier sealing ring against the supporting tubular housing, so that no reactive resin can get between the housing and the plastic tube, which could prevent the plastic tube from being pulled out.
  • the support surface of the carrier sealing ring also serves to support the mixing elements against the high pressure forces that occur during operation.
  • the annular sealing surface can be conical, preferably with a cone angle to the tube axis of 10 ° to 30 °.
  • Other favorable designs of the sealing surface can have roughening, corrugation, scoring or a thread for screwing the plastic tube onto the carrier sealing ring.
  • a tapered thread in particular means that a relatively soft plastic tube can be fixed on the carrier sealing ring so strongly that even high pressure forces do not impair the sealing effect.
  • the plastic tube can also have an inner cone at the end to achieve intimate contact with the carrier sealing ring when assembling the mixer.
  • the plastic tube can advantageously consist of non-adhesive polyolefins such as PE or PP or it can have an inert surface layer, for example made of PTFE, so that it can also be easily removed from hardened resins and adhesives.
  • a longitudinal groove as a predetermined breaking point in the plastic tube can make it easier to cut open after use.
  • a metallic version of the seal between the carrier sealing ring and the end connections is permanent and easy to clean. Mixing elements with crossing webs, as described, for example, in CH-A-642 564 and known as Sulzer SMX mixers, are particularly efficient.
  • Fig. 1 shows a disassemblable mixer according to the invention with a pressure-resistant, load-bearing steel tube as the housing 2, an inserted, replaceable plastic tube 3 as a cheap consumable, static mixing elements 11 inserted therein, a carrier sealing ring 4 each, and with end connections 5 and 6 on both sides which supply lines and outlet nozzles can be connected.
  • This structure enables simple, quick assembly, disassembly, cleaning and reuse of the mixer.
  • the mode of operation of the carrier sealing ring 4 is of crucial importance here.
  • Its support surface 8 absorbs the high pressure forces of the mixing elements of, for example, 200 bar, while at the same time the annular sealing surface 7, with a suitable shape, ensures intimate contact with the more flexible plastic pipe.
  • the plastic tube 3 is plugged or screwed onto this sealing surface on both sides.
  • the connecting elements here clamping ring screw connections 13, are then tightened to such an extent that a load-bearing connection is created from the steel pipe 2 via the carrier sealing ring 4 to the end connection 5, 6.
  • the plastic pipe itself then no longer has to absorb high pressure forces.
  • Suitable shapes of the sealing surface 7 are, for example, slightly conical with an angle W1 of preferably 10 ° to 30 °.
  • the intimate contact with the carrier sealing ring can be improved, depending on the type of plastic tube, by slight roughening, corrugation or scoring 17.
  • a very practical variant with a conical thread 16, which also allows the use of softer plastic pipes, is shown in FIG. 2.
  • the connection to the end connections is made here by means of the flanges 15, 16, with a metallic seal 22 between the carrier sealing ring 4 and the end connection 5 is achieved. The flow of the mixed medium is thus sealed against the outside and pressure-tight towards the plastic pipe.
  • Fig. 3 shows a further variant with a screw 13 and an inner cone 18 at the ends of the plastic tube 3, which is pressed onto a cylindrical or conical sealing surface 7, also provides a secure seal.
  • the plastic tube 3 here has a surface layer 19, e.g. made of PTFE or other inert material, which prevents the plastic pipe from sticking or being attacked by an aggressive mix. With a longitudinal groove (not shown) as the predetermined breaking point in the plastic tube, this can be easily separated after use and the mixing elements 11 can be removed.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Description

Die Erfindung betrifft einen statischen Mischer mit einem rohrartigen Gehäuse, mindestens einem darin angeordneten Mischelement und beidseitigen Endanschlüssen. Derartige Mischer werden zum kontinuierlichen Einmischen, Dispergieren und Homogenisieren von Härtern, Additiven, Beschleunigern, Reaktoren und Farben in Harze, Kleber und Dichtungsmassen verwendet. Damit kann eine Mischleistung bei geringem Gewicht und geringem Volumen des Mischers mit guter Reproduzierbarkeit der Mischqualität und geringem Wärmeeintrag erreicht werden. Solche Mischvorrichtungen sind z.B. aus der CH-A- 642 564 bekannt.The invention relates to a static mixer with a tubular housing, at least one mixing element arranged therein and end connections on both sides. Such mixers are used for the continuous mixing, dispersing and homogenizing of hardeners, additives, accelerators, reactors and paints in resins, adhesives and sealants. This means that mixing performance can be achieved with a low weight and low volume of the mixer with good reproducibility of the mixing quality and low heat input. Such mixing devices are e.g. known from CH-A-642 564.

Vor allem bei reaktivem Mischgut, welches rasch aushärtet, entsteht aber ein grosses Problem dadurch, dass das Mischgut langsam an den Mischelementen anhaftet, sich aufbaut und den Mischer schlussendlich verstopft. Durch die Verengung der Mischelemente infolge Anlagerung werden auch die Mischeigenschaften verändert und nicht mehr reproduzierbar. Beispielsweise müssen bei der Verarbeitung von aktivierten Ein-Komponentenklebern wie Polyurethan mit zugemischter Feuchtigkeit als Beschleuniger hohe Verarbeitungsgeschwindigkeiten mit hohem Arbeitsdruck im Mischer und kurze Reaktionszeiten erreicht werden. Bisherige Mischer können diese Anforderungen nicht erfüllen, da sie zu rasch verstopfen, nicht konstante Klebeigenschaften ergeben und schwer auszuwechseln und zu reinigen sind. Vor allem zur raschen Verarbeitung mit Robotern können bisherige Mischer daher nicht eingesetzt werden. Da gute Mischer relativ teure und präzise Werkzeuge sind, können diese auch nicht einfach als Verbrauchsteile eingesetzt werden.Especially with reactive mix that hardens quickly, a big problem arises from the fact that the mix slowly adheres to the mixing elements, builds up and ultimately clogs the mixer. Due to the narrowing of the mixing elements due to the addition, the mixing properties are also changed and are no longer reproducible. For example, when processing activated one-component adhesives such as polyurethane with added moisture as accelerators, high processing speeds with high working pressure in the mixer and short reaction times must be achieved. Previous Mixers cannot meet these requirements because they clog too quickly, do not give constant adhesive properties and are difficult to replace and clean. Previous mixers cannot therefore be used, especially for rapid processing with robots. Since good mixers are relatively expensive and precise tools, they cannot simply be used as consumables.

Es ist daher Aufgabe der vorliegenden Erfindung, einen Mischer zu schaffen, der hohe Verarbeitungsgeschwindigkeiten von reaktivem Mischgut mit grosser Konstanz und guter Reproduzierbarkeit ermöglicht, der sich rasch und einfach auswechseln lässt, der eine lange Lebensdauer aufweist bzw. sich ständig wieder verwenden lässt und der einfach und vollständig gereinigt werden kann. Diese Aufgabe wird erfindungsgemäss gelöst mit einem statischen Mischer gemäss Anspruch 1. Das auswechselbare Kunststoffrohr, an welchem das Mischgut nicht klebt, ermöglicht eine leichte Demontage des Mischers in seine Einzelteile und damit eine einfache Reinigung und Wiederverwendung der Mischelemente mit einem neuen Kunststoffrohr. Die ringförmige Dichtfläche dichtet dabei den Träger-Dichtring gegen das tragende rohrartige Gehäuse ab, so dass kein Reaktionsharz zwischen Gehäuse und Kunststoffrohr gelangen kann, was das Herausziehen des Kunststoffrohrs verhindern könnte. Die Stützfläche des Träger-Dichtrings dient gleichzeitig dazu, die Mischelemente gegen die im Betrieb auftretenden hohen Druckkräfte abzustützen.It is therefore an object of the present invention to provide a mixer which enables high processing speeds of reactive mix with great constancy and good reproducibility, which can be replaced quickly and easily, which has a long service life or can be used again and again and which is simple and can be cleaned completely. This object is achieved according to the invention with a static mixer according to claim 1. The interchangeable plastic pipe, to which the material to be mixed does not stick, enables the mixer to be easily dismantled into its individual parts and thus simple cleaning and reuse of the mixing elements with a new plastic pipe. The annular sealing surface seals the carrier sealing ring against the supporting tubular housing, so that no reactive resin can get between the housing and the plastic tube, which could prevent the plastic tube from being pulled out. The support surface of the carrier sealing ring also serves to support the mixing elements against the high pressure forces that occur during operation.

Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen beschrieben. Danach kann die ringförmige Dichtfläche konisch ausgebildet sein, vorzugsweise mit einem Konuswinkel zur Rohrachse von 10° bis 30°. Dies ergibt eine einfache und gute Abdichtung zum Kunststoffrohr. Weitere günstige Ausführungen der Dichtfläche können eine Aufrauhung, Riffelung, Rillung oder ein Gewinde zum Aufschrauben des Kunststoffrohrs auf den Träger-Dichtring aufweisen. Vor allem durch ein konischen Gewinde kann auch ein relativ weiches Kunststoffrohr so stark auf den Träger-Dichtring fixiert werden, dass auch hohe Druckkräfte die Dichtwirkung nicht beeinträchtigen. Umgekehrt kann auch das Kunststoffrohr endseitig je einen Innenkonus zum Erreichen eines innigen Kontakts mit dem Träger-Dichtring beim Zusammenbau des Mischers aufweisen. Das Kunststoffrohr kann mit Vorteil aus nicht klebenden Polyolefinen wie PE oder PP bestehen oder es kann innen eine inerte Oberflächenschicht z.B. aus PTFE aufweisen, damit es sich auch von ausgehärteten Harzen und Klebern leicht ablösen lässt. Eine Längsrille als Sollbruchstelle im Kunststoffrohr kann das Auftrennen nach Gebrauch noch erleichtern. Eine metallische Ausführung der Dichtung zwischen Träger-Dichtring und Endanschlüssen ist dauerhaft und leicht zu reinigen. Mischelemente mit sich kreuzenden Stegen wie sie z.B. in der CH-A- 642 564 beschrieben und als Sulzer SMX-Mischer bekannt sind, sind besonders effizient.Advantageous developments of the invention are described in the dependent claims. Thereafter, the annular sealing surface can be conical, preferably with a cone angle to the tube axis of 10 ° to 30 °. This results in a simple and good seal for Plastic pipe. Other favorable designs of the sealing surface can have roughening, corrugation, scoring or a thread for screwing the plastic tube onto the carrier sealing ring. A tapered thread in particular means that a relatively soft plastic tube can be fixed on the carrier sealing ring so strongly that even high pressure forces do not impair the sealing effect. Conversely, the plastic tube can also have an inner cone at the end to achieve intimate contact with the carrier sealing ring when assembling the mixer. The plastic tube can advantageously consist of non-adhesive polyolefins such as PE or PP or it can have an inert surface layer, for example made of PTFE, so that it can also be easily removed from hardened resins and adhesives. A longitudinal groove as a predetermined breaking point in the plastic tube can make it easier to cut open after use. A metallic version of the seal between the carrier sealing ring and the end connections is permanent and easy to clean. Mixing elements with crossing webs, as described, for example, in CH-A-642 564 and known as Sulzer SMX mixers, are particularly efficient.

Im folgenden wird die Erfindung anhand von Beispielen und Figuren näher erläutert. Dabei zeigen:

  • Fig. 1 Einen erfindungsgemässen Mischer mit Träger-Dichtring;
  • Fig. 2 Einen Teil eines Mischers mit konischem Gewinde;
  • Fig. 3 Ein weiteres Beispiel mit konischem Kunststoffrohr.
The invention is explained in more detail below with the aid of examples and figures. Show:
  • 1 shows a mixer according to the invention with a carrier sealing ring;
  • 2 shows a part of a mixer with a conical thread;
  • Fig. 3 Another example with a conical plastic tube.

Fig. 1 zeigt einen erfindungsgemässen zerlegbaren Mischer mit einem druckfesten, tragenden Stahlrohr als Gehäuse 2, einem eingeschobenen, auswechselbaren Kunststoffrohr 3 als billiges Verbrauchsteil, darin eingelegten statischen Mischelementen 11, je einem Träger-Dichtring 4, sowie mit beidseitigen Endanschlüssen 5 und 6, an welche Zulaufleitungen und Austrittsdüsen angeschlossen werden können. Dieser Aufbau ermöglicht einfache, rasche Montage, Zerlegung, Reinigung und Wiederverwendung des Mischers. Von entscheidender Bedeutung ist dabei die Wirkungsweise des Trägerdichtrings 4. Dessen Stützfläche 8 nimmt die hohen auftretenden Druckkräfte der Mischelemente von z.B. 200 bar auf, während gleichzeitig die ringförmige Dichtfläche 7 mit geeigneter Formgebung einen innigen Kontakt zum nachgiebigeren Kunststoffrohr gewährleistet. Bei der Montage wird das Kunststoffrohr 3 beidseitig auf diese Dichtfläche aufgesteckt oder aufgeschraubt. Anschliessend werden die Verbindungselemente, hier Klemmringverschraubungen 13, soweit angezogen, dass eine tragende Verbindung vom Stahlrohr 2 über den Träger-Dichtring 4 zum Endanschluss 5, 6 entsteht. Das Kunststoffrohr selber muss dann keine hohen Druckkräfte mehr aufnehmen. Geeignete Formgebungen der Dichtfläche 7 sind z.B. leicht konisch mit einem Winkel W1 von vorzugsweise 10° bis 30°. Der innige Kontakt mit dem Träger-Dichtring kann abhängig von der Art des Kunststoffrohrs, durch leichte Aufrauhung, Riffelung oder Rillung 17 noch verbessert werden. Eine sehr praktische Variante mit einem konischen Gewinde 16, welche auch weichere Kunststoffrohre einzusetzen erlaubt, zeigt Fig. 2. Die Verbindung zu den Endanschlüssen ist hier mittels der Flansche 15, 16 hergestellt, wobei eine metallische Abdichtung 22 zwischen Träger-Dichtring 4 und Endanschluss 5 erreicht wird. Der Fluss des Mischmediums ist damit gegen aussen und zum Kunststoffrohr hin druckfest abgedichtet.Fig. 1 shows a disassemblable mixer according to the invention with a pressure-resistant, load-bearing steel tube as the housing 2, an inserted, replaceable plastic tube 3 as a cheap consumable, static mixing elements 11 inserted therein, a carrier sealing ring 4 each, and with end connections 5 and 6 on both sides which supply lines and outlet nozzles can be connected. This structure enables simple, quick assembly, disassembly, cleaning and reuse of the mixer. The mode of operation of the carrier sealing ring 4 is of crucial importance here. Its support surface 8 absorbs the high pressure forces of the mixing elements of, for example, 200 bar, while at the same time the annular sealing surface 7, with a suitable shape, ensures intimate contact with the more flexible plastic pipe. During assembly, the plastic tube 3 is plugged or screwed onto this sealing surface on both sides. The connecting elements, here clamping ring screw connections 13, are then tightened to such an extent that a load-bearing connection is created from the steel pipe 2 via the carrier sealing ring 4 to the end connection 5, 6. The plastic pipe itself then no longer has to absorb high pressure forces. Suitable shapes of the sealing surface 7 are, for example, slightly conical with an angle W1 of preferably 10 ° to 30 °. The intimate contact with the carrier sealing ring can be improved, depending on the type of plastic tube, by slight roughening, corrugation or scoring 17. A very practical variant with a conical thread 16, which also allows the use of softer plastic pipes, is shown in FIG. 2. The connection to the end connections is made here by means of the flanges 15, 16, with a metallic seal 22 between the carrier sealing ring 4 and the end connection 5 is achieved. The flow of the mixed medium is thus sealed against the outside and pressure-tight towards the plastic pipe.

Fig. 3 zeigt eine weitere Variante mit einer Verschraubung 13 und einem Innenkonus 18 an den Enden des Kunststoffrohrs 3, welcher auf eine zylindrische oder auch konische Dichtfläche 7 aufgepresst, ebenfalls eine sichere Abdichtung ergibt. Das Kunststoffrohr 3 weist hier eine Oberflächenschicht 19, z.B. aus PTFE oder anderem inertem Material auf, die ein Kleben oder Angreifen des Kunststoffrohrs durch ein aggressives Mischgut verhindert. Mit einer nicht gezeichneten Längsrille als Soll-Bruchstelle im Kunststoffrohr kann dieses nach Gebrauch leicht aufgetrennt und die Mischelemente 11 herausgenommen werden.Fig. 3 shows a further variant with a screw 13 and an inner cone 18 at the ends of the plastic tube 3, which is pressed onto a cylindrical or conical sealing surface 7, also provides a secure seal. The plastic tube 3 here has a surface layer 19, e.g. made of PTFE or other inert material, which prevents the plastic pipe from sticking or being attacked by an aggressive mix. With a longitudinal groove (not shown) as the predetermined breaking point in the plastic tube, this can be easily separated after use and the mixing elements 11 can be removed.

Claims (12)

  1. A static mixer comprising a tubular housing, at least one mixing element disposed therein, and end connections on both sides, characterised by an interchangeable plastic tube (3) disposed as a consumable between the housing (2) and the mixing elements (11), and by carrier and sealing rings (4) disposed one between each end connection (5, 6) and the housing (2), said rings having an abutment surface (8) for the mixing elements and an annular sealing surface (7), the plastic tube (3) bearing on the latter so as to be devoid of any gap.
  2. A mixer according to claim 1, characterised in that the annular sealing surface (7) is conical.
  3. A mixer according to claim 2, characterised in that the cone angle W1 to the tube axis is 10° to 30°.
  4. A mixer according to claim 1, characterised in that the sealing surface has a roughening, fluting or grooving (17).
  5. A mixer according to claim 1, characterised in that the sealing surface (7) has a screwthread (16) for screwing on the plastic tube (3).
  6. A mixer according to claim 1, characterised in that the sealing surface has a conical screwthread.
  7. A mixer according to claim 1, characterised in that each end of the plastic tube (3) has an internal cone (18) with an angle W2 of 10° to 30° to the tube axis.
  8. A mixer according to claim 1, characterised in that the plastic tube consists of polyolefins such as PE or PP.
  9. A mixer according to claim 1, characterised in that the plastic tube has at least on the inside an inert surface layer (19) e.g. of PTFE.
  10. A mixer according to claim 1, characterised in that the plastic tube has a longitudinal groove (21) as an intentional breakage point for separation after use.
  11. A mixer according to claim 1, characterised by a metal seal (22) between the carrier and sealing ring (4) and end connections (5, 6).
  12. A mixer according to claim 1, characterised in that the mixing elements (11) have crossing webs.
EP91810656A 1990-09-19 1991-08-20 Static mixer with tubelike housing Expired - Lifetime EP0478497B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH303690 1990-09-19
CH3036/90 1990-09-19

Publications (2)

Publication Number Publication Date
EP0478497A1 EP0478497A1 (en) 1992-04-01
EP0478497B1 true EP0478497B1 (en) 1994-03-30

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EP91810656A Expired - Lifetime EP0478497B1 (en) 1990-09-19 1991-08-20 Static mixer with tubelike housing

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US (1) US5255974A (en)
EP (1) EP0478497B1 (en)
JP (1) JP3122181B2 (en)
CA (1) CA2051482A1 (en)
DE (1) DE59101271D1 (en)

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US5068494A (en) * 1990-06-27 1991-11-26 Appleton Electric Company Conduit connector for eccentrically dimensioned conduit

Also Published As

Publication number Publication date
EP0478497A1 (en) 1992-04-01
CA2051482A1 (en) 1992-03-20
US5255974A (en) 1993-10-26
JP3122181B2 (en) 2001-01-09
DE59101271D1 (en) 1994-05-05
JPH04260430A (en) 1992-09-16

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