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EP0250881B1 - Process for applying a fluent material to the inner side of a hollow body, and apparatus for carrying out the process - Google Patents

Process for applying a fluent material to the inner side of a hollow body, and apparatus for carrying out the process Download PDF

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Publication number
EP0250881B1
EP0250881B1 EP87107775A EP87107775A EP0250881B1 EP 0250881 B1 EP0250881 B1 EP 0250881B1 EP 87107775 A EP87107775 A EP 87107775A EP 87107775 A EP87107775 A EP 87107775A EP 0250881 B1 EP0250881 B1 EP 0250881B1
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EP
European Patent Office
Prior art keywords
spin
carrier gas
cavity
gas flow
passage
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EP87107775A
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German (de)
French (fr)
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EP0250881A1 (en
Inventor
Beat Eckert
Guido Huber
Norbert Richle
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Lonza AG
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Lonza AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes

Definitions

  • the invention relates to a method for applying a flowable substance to the inner surface of a hollow body and a device for carrying out the method.
  • a method according to the preamble of claim 1 for descaling the inner surface of glowing blanks in the production of seamless tubes and a device according to the preamble of claim 5 for carrying out this method are known (EP-A-0 133 937).
  • the carrier gas stream loaded with the substance namely a descaling agent
  • the swirl brings a more even distribution of the substance in the carrier gas and the centrifugal force that occurs as a result of the swirl brings a larger part of the substance onto the inner surface of the hollow body without following gravity.
  • the loaded carrier gas stream with the swirl must first force the air at rest in the cavity through and out of the cavity. Part of its swirl is transferred to this air and is lost for the application of the substance to the inner surface of the hollow body.
  • the loaded carrier gas stream flows through the cavity, its velocity and swirl near the inner surface are less than in the center of the cavity cross-section. The flow becomes laminar due to the friction on the inner surface, especially when it is rough, e.g. in the case of a bowl, is covered with a layer of scale. Overall, only part of the swirl imparted to the loaded carrier gas tom is effective for applying the substance to the inner surface.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, solves the problem of improving the method and the device of the type mentioned in order to transfer a larger part of the substance with which the carrier gas stream to which the swirl was given is loaded onto the inner surface bring the hollow body.
  • twist is to be understood in the sense of a screwing movement or a helical movement.
  • the advantages achieved by the invention are essentially to be seen in the fact that the loaded carrier gas stream with the swirl when entering the cavity does not encounter still air, but rather the additional, unloaded gas stream which is in the same direction and with a swirl of the same direction of rotation how the laden carrier gas stream is already flowing through the cavity.
  • the loaded carrier stream acts immediately at full speed and with all the twist given to it for applying the substance to the inner surface, from one end of the cavity to the other.
  • the additional gas flow is continued for at least part of the duration of the loaded carrier gas stream, the loss of speed and swirl caused by friction of the loaded carrier gas stream on the inner surface can be canceled out by the action of the additional gas stream, so that overall a swirl to the effect comes, which can be the swirl given to the carrier gas flow, depending on the speed and swirl of the additional gas flow, but also larger (or smaller) than that.
  • the additional gas flow acts only near the inner surface of the cavity.
  • Both the carrier gas and the additional gas which is not loaded with the substance can, depending on the type of substance, the material of the hollow body or the application of the method or use of the device, air or another, in particular inert gas or a gas mixture and do not have to be the same, especially since one is first with the substance and only later together with the substance and the other first alone and possibly later together with the carrier gas-substance mixture with the (in the case of a glowing bob) the inner surface of the cavity comes into contact.
  • the other gas could also be or contain a liquid in the gaseous phase or an aerosol.
  • the flowable substance can be a semi-liquid, a paste, a molten or particulate material, such as powder, granular material, short fibers or chips, a liquid or a mixture of such substances.
  • the gas flow leaving the cavity and containing the carrier gas and the additional gas and a remainder of the substance can be sucked off to support the flow in the cavity, the rest of the substance, if it consists of fine particles, can be separated in a separator for further use .
  • the invention is explained in more detail below with reference to a drawing which represents only one embodiment.
  • the single figure shows a perspective view of a partially sectioned device for carrying out the method for applying a flowable substance to the inner surface of a hollow body, the cavity of which is continuous and at least approximately cylindrical.
  • This device is particularly suitable for the application of the method for applying a flowable descaling agent to the inner surface of blanks in the manufacture of seamless pipes.
  • Its essential part in connection with the invention is a passage element 1 for a carrier gas stream loaded with the substance.
  • guide vanes 3 are arranged, which are used for a swirl sensor form the loaded carrier gas stream.
  • the passage element 1 is provided with a feed device, in the drawing with nozzles 4 for an additional gas not loaded with the substance, the outflow directions of which are arranged obliquely to the axis of the passage space 2 in order to give this gas a twist with the direction of rotation 5 of the to issue the guide vanes 3 formed swirl generator. In the drawing, this is a right-hand twist.
  • the nozzles 4 can be designed as Laval nozzles.
  • the feed line 7 for the loaded carrier gas is together with the passage member 1 by a displacement unit 8 with a thrust path of e.g. 40 cm and a flexible sleeve 9 guided, which make it possible to bring the passage member 1 to the cavity, center it with respect to this and withdraw it again.
  • the passage member 1 is conical as a diffuser. For smaller diameter cavities, however, a cylindrical design may be appropriate. Between the end (mouthpiece 16) of the feed line 7 and the entrance of the passage element 1 there is an intermediate space 12, which is open on the circumference, e.g. 15-35, preferably 20-30 mm in length, as a result of which the effect known in jet apparatuses (jet pumps, atomizers) is achieved, which causes a better distribution of the substance in the carrier gas stream leaving the passage element. If the access of air to the laden carrier gas stream is undesirable, an annular space with gas supply which is closed to the outside and surrounds the intermediate space can be provided. Lines 13 leading to the nozzles 4 run along the intermediate space 12 and are connected to a cylinder 14 enclosing part of the supply line 7 and having a connection 15 for the supply of the additional gas.
  • a displacer 18 which is flared conically in the direction of flow, in the case of the diffuser a diffuser cone which is hollow and open at both ends in order to support the above-mentioned effect, which is known in jet devices.
  • the passage element 1 or the diffuser has a double jacket 20 with a feed line 21 and a discharge line for cooling water, not shown, and the displacement body 18 or diffuser cone is hollow in order to keep the heating by heat radiation from the glowing cap small. For this reason, the guide vanes 3 are also connected to the cooled jacket in a heat-conducting manner, e.g. welded on.
  • the guide vanes 3 are groove-like in cross-section and curved in their longitudinal direction, so that the hollow side of each of these curvatures lies in the direction of rotation 5 of the swirl caused.
  • the radius of curvature of the channel profile increases in the direction of flow, corresponding to the increase in the diameter of the conical diffuser.
  • the guide vanes can be helical (without the curvatures).
  • the guide vanes 3 can deviate from the design shown at the outlet of the passage element e.g. 5 cm protruding ends (not shown), the width of which decreases in the flow direction in such a way that the guide vane ring is tapered in the area of these ends in order to grip the hollow body in its cavity when approaching the passage element 1 and to access the hollow body in relation to it center.
  • the nozzles 4 for supplying the additional gas not loaded with the substance are arranged at the exit of the passage element 1 at the end of a guide vane 3 so skewed to the axis 6 of the passage space 2 that the swirl angle (the one tangent to the helix corresponding to the swirl) with the helix axis) is greater (the helix angle of this helix is therefore smaller) than the helix angle (or helix angle) of the helix of the carrier gas stream loaded with the substance.
  • a conically enlarged passage element In the case of a conically enlarged passage element (diffuser 1), three to six, preferably four guide vanes can be provided, and in the case of a cylindrical passage element four to twelve, preferably six to ten, guide vanes can be provided.
  • a nozzle 4 is expediently arranged at the end of every second guide vane 3.
  • the angle at the tip of the cone of the displacer (or diffuser cone) 18 can be 35 degrees for a cavity diameter of 15-20 cm, 30 degrees for smaller cavity diameters and 40 degrees for larger cavity diameters.
  • the angle at the tip of its cone can be equal to that of the displacer body 18.
  • the inside diameter of the mouthpiece 16 at the end of the feed line 7 is expediently 10 mm for the loaded carrier gas stream if 100-150 grams of powdered descaling agent are used per slug, or up to 30 mm if approx. 400 each Grams of descaling agent can be used.
  • passage elements 1 of different sizes also with different swirl angles, in particular conical passage elements for larger diameters and cylindrical ones for small diameters, can optionally be attached individually to the end piece of the pipeline 7 for the laden carrier gas stream.
  • the glowing blob is brought to the device so that the slug cavity is sufficiently coaxial passage space of the passage member. Then the device is brought close to the cavity and, if necessary, centered by actuating the displacement unit 8, the sleeve 9 giving way and, if appropriate, the (not shown) tapered blade ring end being guided into the cavity as a centering means. Then, air not loaded with the descaling agent is first supplied to the connection 14 at a pressure of, for example, 6 bar and blown through the nozzles 4 into the cavity.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Coating Apparatus (AREA)
  • Powder Metallurgy (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Aufbringen eines fliessfähigen Stoffes auf die Innenfläche eines Hohlkörpers und eine Einrichtung zur Durchführung des Verfahrens.The invention relates to a method for applying a flowable substance to the inner surface of a hollow body and a device for carrying out the method.

Es sind ein Verfahren gemäss dem Oberbegriff des Patentanspruchs 1 zum Entzundern der Innenfläche glühender Luppen bei der Herstellung nahtloser Rohre und eine Einrichtung nach dem Oberbegriff des Patentanspruchs 5 zur Durchführung dieses Verfahrens bekannt (EP-A-0 133 937). Bei diesem Verfahren und mit dieser Einrichtung wird der mit dem Stoff, nämlich einem Entzunderungsmittel, beladene Trägergasstrom mit dem Drall unmittelbar durch den Hohlkörper, nämlich die glühende Luppe, geleitet. Dabei wird durch den Drall eine gleichmässigere Verteilung des Stoffes im Trägergas und durch die infolge des Dralles auftretende Fliehkraft ein grösserer Teil des Stoffes auf die Innenfläche des Hohlkörpers gebracht, ohne der Schwerkraft zu folgen.A method according to the preamble of claim 1 for descaling the inner surface of glowing blanks in the production of seamless tubes and a device according to the preamble of claim 5 for carrying out this method are known (EP-A-0 133 937). In this method and with this device, the carrier gas stream loaded with the substance, namely a descaling agent, is conducted with the swirl directly through the hollow body, namely the glowing cap. The swirl brings a more even distribution of the substance in the carrier gas and the centrifugal force that occurs as a result of the swirl brings a larger part of the substance onto the inner surface of the hollow body without following gravity.

Der beladene Trägergasstrom mit dem Drall muss zuerst die im Hohlraum ruhende Luft durch den Hohlraum hindurch und aus diesem heraus drängen. Dabei wird ein Teil seines Dralls an diese Luft übertragen und geht für das Aufbringen des Stoffes auf die Innenfläche des Hohlkörpers verloren. Wenn der beladene Trägergasstrom durch den Hohlraum strömt, sind seine Geschwindigkeit und sein Drall in der Nähe der Innenfläche kleiner als in der Mitte des Hohlraumquerschnitts Die Strömung wird laminar wegen der Reibung an der Innenfläche, besonders wenn diese rauh, z.B. im Falle einer Luppe, mit einer Zunderschicht überzogen ist. Insgesamt ist nur ein Teil des dem beladenen Trägergasstom erteilten Dralls zum Aufbringen des Stoffes auf die Innenfläche wirksam.The loaded carrier gas stream with the swirl must first force the air at rest in the cavity through and out of the cavity. Part of its swirl is transferred to this air and is lost for the application of the substance to the inner surface of the hollow body. When the loaded carrier gas stream flows through the cavity, its velocity and swirl near the inner surface are less than in the center of the cavity cross-section. The flow becomes laminar due to the friction on the inner surface, especially when it is rough, e.g. in the case of a bowl, is covered with a layer of scale. Overall, only part of the swirl imparted to the loaded carrier gas tom is effective for applying the substance to the inner surface.

Hier will die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in den Patentansprüchen gekennzeichnet ist, löst die Aufgabe, das Verfahren und die Einrichtung der genannten Art zu verbessern, um einen grösseren Teil des Stoffes, mit dem der Trägergasstrom, dem der Drall erteilt wurde, beladen ist, auf die Innenfläche des Hohlkörpers zu bringen. Dabei ist Drall im Sinne einer Schraubbewegung oder schraubenlinienförmigen Bewegung zu verstehen.The invention seeks to remedy this. The invention, as characterized in the claims, solves the problem of improving the method and the device of the type mentioned in order to transfer a larger part of the substance with which the carrier gas stream to which the swirl was given is loaded onto the inner surface bring the hollow body. Here, twist is to be understood in the sense of a screwing movement or a helical movement.

Die durch die Erfindung erzielten Vorteile sind im wesentlichen darin zu sehen, dass der beladene Trägergasstrom mit dem Drall beim Eindringen in den Hohlraum nicht auf ruhende Luft trifft, sondern auf den zusätzlichen, nicht beladenen Gasstrom, der in derselben Richtung und mit einem Drall desselben Drehsinnes wie der beladene Trägergasstrom bereits durch den Hohlraum fliesst. Dadurch wirkt der beladene Trägerstrom sofort mit seiner ganzen Geschwindigkeit und dem ganzen ihm erteilten Drall für das Aufbringen des Stoffes auf die Innenfläche, von einem Hohlraumende zum anderen. Wenn der zusätzliche Gasstrom während wenigstens eines Teiles der Dauer des beladenen Trägergasstromes fortgesetzt wird, kann während dieser Zeit der durch Reibung des beladenen Trägergasstromes an der Innenfläche verursachte Geschwindigkeits-und Drallverlust durch die Wirkung des zusätzlichen Gasstromes aufgehoben werden, so dass insgesamt ein Drall zur Wirkung kommt, der dem dem Trägergasstrom erteilten Drall je nach Geschwindigkeit und Drall des zusätzlichen Gasstromes gleich, aber auch grösser- (oder auch kleiner) sein kann als jener. Indem der zusätzliche Gasstrom an einer oder in Teilströmen an mehreren gleichmässig verteilten Stellen des Umfangs des Hohlraums in diesen geleitet wird, kann erreicht werden, dass der zusätzliche Gasstrom nur nahe der Innenfläche des Hohlraumes wirkt. Insgesamt wird die Wirksamkeit des bekannten Verfahrens bzw. der bekannten Vorrichtung durch die Erfindung erheblich verbessert. Weitere Vorteile und vorteilhafte Ausführungen der Erfindung gehen aus der weiter unten folgenden Beschreibung eines Ausführungsweges der Erfindung hervor.The advantages achieved by the invention are essentially to be seen in the fact that the loaded carrier gas stream with the swirl when entering the cavity does not encounter still air, but rather the additional, unloaded gas stream which is in the same direction and with a swirl of the same direction of rotation how the laden carrier gas stream is already flowing through the cavity. As a result, the loaded carrier stream acts immediately at full speed and with all the twist given to it for applying the substance to the inner surface, from one end of the cavity to the other. If the additional gas flow is continued for at least part of the duration of the loaded carrier gas stream, the loss of speed and swirl caused by friction of the loaded carrier gas stream on the inner surface can be canceled out by the action of the additional gas stream, so that overall a swirl to the effect comes, which can be the swirl given to the carrier gas flow, depending on the speed and swirl of the additional gas flow, but also larger (or smaller) than that. By guiding the additional gas flow into one or in partial flows at several evenly distributed locations on the circumference of the cavity, it can be achieved that the additional gas flow acts only near the inner surface of the cavity. Overall, the effectiveness of the known method or the known device is considerably improved by the invention. Further advantages and advantageous embodiments of the invention will become apparent from the description of an embodiment of the invention which follows below.

Sowohl das Trägergas als auch das zusätzliche Gas, das nicht mit dem Stoff beladen wird, können je nach der Art des Stoffes, des Materials des Hohlkörpers oder der Anwendung des Verfahrens bzw. Verwendung der Einrichtung Luft oder ein anderes, insbesondere inertes Gas oder ein Gasgemisch und brauchen nicht gleich zu sein, zumal das eine zuerst mit dem Stoff und erst später zusammen mit dem Stoff und das andere zuerst allein und gegebenenfalls später zusammen mit dem Trägergas-Stoff-Gemisch mit der (im Falle einer glühenden Luppe heissen) Innenfläche des Hohlraums in Berührung kommt. Auch könnte das andere Gas eine Flüssigkeit in gasförmiger Phase oder ein Aerosol sein oder enthalten.Both the carrier gas and the additional gas which is not loaded with the substance can, depending on the type of substance, the material of the hollow body or the application of the method or use of the device, air or another, in particular inert gas or a gas mixture and do not have to be the same, especially since one is first with the substance and only later together with the substance and the other first alone and possibly later together with the carrier gas-substance mixture with the (in the case of a glowing bob) the inner surface of the cavity comes into contact. The other gas could also be or contain a liquid in the gaseous phase or an aerosol.

Der fliessfähige Stoff kann je nach Anwendung des Verfahrens bzw. Verwendung der Einrichtung eine Halbflüssigkeit, eine Paste, ein schmelzflüssiges oder partikelförmiges Gut, wie Pulver, körniges Gut, kurze Fasern oder Späne, eine Flüssigkeit oder ein Gemisch solcher Stoffe sein.Depending on the application of the method or use of the device, the flowable substance can be a semi-liquid, a paste, a molten or particulate material, such as powder, granular material, short fibers or chips, a liquid or a mixture of such substances.

Die den Hohlraum verlassende, das Trägergas und das zusätzliche Gas sowie einen Rest des Stoffes enthaltende Gasströmung kann zur Unterstützung der Strömung im Hohlraum abgesaugt werden, wobei der Rest des Stoffes, wenn dieser aus feinen Partikeln besteht, in einem Abscheider zwecks weiterer Verwendung abgeschieden werden kann.The gas flow leaving the cavity and containing the carrier gas and the additional gas and a remainder of the substance can be sucked off to support the flow in the cavity, the rest of the substance, if it consists of fine particles, can be separated in a separator for further use .

Im folgenden wird die Erfindung anhand einer nur einen Ausführungsweg darstellenden Zeichnung näher erläutert. Die einzige Figur zeigt eine perspektivische Ansicht einer teils geschnittenen Einrichtung zur Durchführung des Verfahrens zum Aufbringen eines fliessfähigen Stoffes auf die Innenfläche eines Hohlkörpers, dessen Hohlraum durchgehend und wenigstens annähernd zylindrisch ist.The invention is explained in more detail below with reference to a drawing which represents only one embodiment. The single figure shows a perspective view of a partially sectioned device for carrying out the method for applying a flowable substance to the inner surface of a hollow body, the cavity of which is continuous and at least approximately cylindrical.

Diese Einrichtung ist insbesondere für die Anwendung des Verfahrens zum Aufbringen eines fliessfähigen Entzunderungsmittels auf die Innenfläche von Luppen bei der Herstellung nahtloser Rohre geeignet. Ihr im Zusammenhang mit der Erfindung wesentlicher Teil ist ein Durchlassorgan 1 für einen mit dem Stoff beladenen Trägergasstrom. Im Durchlassraum 2 des Durchlassorgans 1 sind Leitschaufeln 3 angeordnet, die einen Drallgeber für den beladenen Trägergasstrom bilden. Erfindungsgemäss ist das Durchlassorgan 1 mit einer Zufuhrvorrichtung, in der Zeichnung mit Düsen 4 für ein zusätzliches, nicht mit dem Stoff beladenes Gas versehen, deren Ausströmrichtungen windschief zur Achse des Durchlassraumes 2 angeordnet sind, um diesem Gas einen Drall-mit dem Drehsinn 5 des durch die Leitschaufeln 3 gebildeten Drallgebers zu erteilen. In der Zeichnung ist dies ein Rechtsdrall. Die Düsen 4 können als Lavaldüsen ausgeführt sein.This device is particularly suitable for the application of the method for applying a flowable descaling agent to the inner surface of blanks in the manufacture of seamless pipes. Its essential part in connection with the invention is a passage element 1 for a carrier gas stream loaded with the substance. In the passage space 2 of the passage element 1, guide vanes 3 are arranged, which are used for a swirl sensor form the loaded carrier gas stream. According to the invention, the passage element 1 is provided with a feed device, in the drawing with nozzles 4 for an additional gas not loaded with the substance, the outflow directions of which are arranged obliquely to the axis of the passage space 2 in order to give this gas a twist with the direction of rotation 5 of the to issue the guide vanes 3 formed swirl generator. In the drawing, this is a right-hand twist. The nozzles 4 can be designed as Laval nozzles.

Die Zuleitung 7 für das beladene Trägergas ist zusammen mit dem Durchlassorgan 1 durch eine Verschiebeeinheit 8 mit einem Schubweg von z.B. 40 cm und eine biegsame Muffe 9 geführt, die es ermöglichen, das Durchlassorgan 1 an den Hohlraum heranzuführen, in Bezug auf diesen zu zentrieren und wieder zurückzuziehen.The feed line 7 for the loaded carrier gas is together with the passage member 1 by a displacement unit 8 with a thrust path of e.g. 40 cm and a flexible sleeve 9 guided, which make it possible to bring the passage member 1 to the cavity, center it with respect to this and withdraw it again.

Das Durchlassorgan 1 ist konisch als Diffusor ausgeführt. Für Hohlräume kleineren Durchmessers kann jedoch eine zylindrische Ausführung zweckmässig sein. Zwischen dem Ende (Mundstück 16) der Zuleitung 7 und dem Eingang des Durchlassorgans 1 ist ein am Umfang offener Zwischenraum 12 von z.B. 15-35, vorzugsweise 20-30 mm Länge, wodurch der bei Strahlapparaten (Strahlpumpen, Zerstäubern) bekannte Effekt erzielt wird, der zu einer besseren Verteilung des Stoffes im das Durchlassorgan verlassenden Trägergasstrom bewirkt. Wenn der Zutritt von Luft zum beladenen Trägergasstrom unerwünscht ist, kann ein nach aussen geschlossener, den Zwischenraum umschliessender Ringraum mit Gaszufuhr vorgesehen werden. Längs des Zwischenraumes 12 verlaufen zu den Düsen 4 führende Leitungen 13, die an einen Teil der Zuleitung 7 umschliessenden Zylinder 14 angeschlossen sind, der einen Anschluss 15 für die Zufuhr des zusätzlichen Gases hat.The passage member 1 is conical as a diffuser. For smaller diameter cavities, however, a cylindrical design may be appropriate. Between the end (mouthpiece 16) of the feed line 7 and the entrance of the passage element 1 there is an intermediate space 12, which is open on the circumference, e.g. 15-35, preferably 20-30 mm in length, as a result of which the effect known in jet apparatuses (jet pumps, atomizers) is achieved, which causes a better distribution of the substance in the carrier gas stream leaving the passage element. If the access of air to the laden carrier gas stream is undesirable, an annular space with gas supply which is closed to the outside and surrounds the intermediate space can be provided. Lines 13 leading to the nozzles 4 run along the intermediate space 12 and are connected to a cylinder 14 enclosing part of the supply line 7 and having a connection 15 for the supply of the additional gas.

Im Durchlassraum 2 ist ein in Strömungsrichtung konisch erweiterter Verdrängerkörper 18, im Falle des Diffusors ein Diffusorkonus angeordnet, der hohl und an beiden Enden offen ist, um die genannte, bei Strahlapparaten bekannte Wirkung zu unterstützen.In the passage space 2 there is a displacer 18 which is flared conically in the direction of flow, in the case of the diffuser a diffuser cone which is hollow and open at both ends in order to support the above-mentioned effect, which is known in jet devices.

Das Durchlassorgan 1 bzw. der Diffusor hat einen doppelten Mantel 20 mit einer Zuleitung 21 und einer nicht dargestellten Ableitung für Kühlwasser und der Verdrängungskörper 18 bzw. Diffusorkonus ist hohl ausgeführt, um die Erwärmung durch Wärmestrahlung der glühenden Luppe klein zu halten. Aus diesem Grunde sind auch die Leitschaufeln 3 möglichst gut wärmeleitend mit dem gekühlten Mantel verbunden, z.B. angeschweisst.The passage element 1 or the diffuser has a double jacket 20 with a feed line 21 and a discharge line for cooling water, not shown, and the displacement body 18 or diffuser cone is hollow in order to keep the heating by heat radiation from the glowing cap small. For this reason, the guide vanes 3 are also connected to the cooled jacket in a heat-conducting manner, e.g. welded on.

Die Leitschaufeln 3 sind im Querschnitt rinnenartig und in ihrer Längsrichtung gekrümmt, so dass die hohle Seite jeder dieser Krümmungen in Richtung des Drehsinns 5 des bewirkten Dralls liegt. Der Krümmungsradius des Rinnenprofils nimmt in Strömungsrichtung zu, entsprechend der Zunahme des Durchmessers des konischen Diffusors. Bei einem zylindrischen Durchlassorgan können die Leitschaufeln wendelartig (ohne die Krümmungen) sein.The guide vanes 3 are groove-like in cross-section and curved in their longitudinal direction, so that the hollow side of each of these curvatures lies in the direction of rotation 5 of the swirl caused. The radius of curvature of the channel profile increases in the direction of flow, corresponding to the increase in the diameter of the conical diffuser. In the case of a cylindrical passage element, the guide vanes can be helical (without the curvatures).

Die Leitschaufeln 3 können abweichend von der gezeichneten Ausführung am Ausgang des Durchlassorgans z.B. 5 cm weit herausragende (nicht dargestellte) Enden haben, deren Breite in Strömungsrichtung so abnimmt, dass der Leitschaufelkranz im Bereiche dieser Enden konisch verjüngt ist, um beim Heranführen des Durchlassorgans 1 an den Hohlkörper in dessen Hohlraum zu greifen und jenen in bezug auf diesen zu zentrieren.The guide vanes 3 can deviate from the design shown at the outlet of the passage element e.g. 5 cm protruding ends (not shown), the width of which decreases in the flow direction in such a way that the guide vane ring is tapered in the area of these ends in order to grip the hollow body in its cavity when approaching the passage element 1 and to access the hollow body in relation to it center.

Die Düsen 4 zur Zufuhr des zusätzlichen, nicht mit dem Stoff beladenen Gases sind am Ausgang des Durchlassorgans 1 je am Ende einer Leitschaufel 3 so windschief zur Achse 6 des Durchlassraums 2 angeordnet, dass der Drallwinkel (den eine an die dem Drall entsprechende Schraubenlinie gelegte Tangente mit der Schraubenlinienachse bildet) grösser (der Steigungswinkel dieser Schraubenlinie also kleiner) als der Drallwinkel (bzw. der Steigungswinkel) des Dralles des mit dem Stoff beladenen Trägergasstromes ist.The nozzles 4 for supplying the additional gas not loaded with the substance are arranged at the exit of the passage element 1 at the end of a guide vane 3 so skewed to the axis 6 of the passage space 2 that the swirl angle (the one tangent to the helix corresponding to the swirl) with the helix axis) is greater (the helix angle of this helix is therefore smaller) than the helix angle (or helix angle) of the helix of the carrier gas stream loaded with the substance.

Bei einem konisch erweiterten Durchlassorgan (Diffusor 1) können drei bis sechs, vorzugsweise vier Leitschaufeln, bei einem zylindrischen Durchlassorgan können vier bis zwölf, vorzugsweise sechs bis zehn Leitschaufeln vorgesehen sein. Zweckmässig ist am Ende jeder zweiten Leitschaufel 3 eine Düse 4 angeordnet. Der Winkel an der Kegelspitze des Verdrängerkörpers (bzw. Diffusorkonus) 18 kann für einen Hohlraumdurchmesser von 15-20 cm 35 Grad, für kleinere Hohlraumdurchmesser 30 Grad und für grössere Hohlraumdurchmesser 40 Grad betragen. Bei einem konisch erweiterten Verdrängerkörper (Diffusorkonus) 1 kann der Winkel an dessen Degelspitze gleich dem des Verdrängerkörpers 18 sein. Bei Verwendung der Einrichtung zum Entzundern von Luppen ist der Innendurchmesser des Mundstücks 16 am Ende der Zufuhrleitung 7 für den beladenen Trägergasstrom zweckmässig 10 mm, wenn pro Luppe 100-150 Gramm pulverförmiges Entzunderungsmittel verwendet werden, bzw. bis 30 mm, wenn jeweils ca. 400 Gramm Entzunderungsmittel verwendet werden.In the case of a conically enlarged passage element (diffuser 1), three to six, preferably four guide vanes can be provided, and in the case of a cylindrical passage element four to twelve, preferably six to ten, guide vanes can be provided. A nozzle 4 is expediently arranged at the end of every second guide vane 3. The angle at the tip of the cone of the displacer (or diffuser cone) 18 can be 35 degrees for a cavity diameter of 15-20 cm, 30 degrees for smaller cavity diameters and 40 degrees for larger cavity diameters. In the case of a conically widened displacer body (diffuser cone) 1, the angle at the tip of its cone can be equal to that of the displacer body 18. When using the device for descaling slugs, the inside diameter of the mouthpiece 16 at the end of the feed line 7 is expediently 10 mm for the loaded carrier gas stream if 100-150 grams of powdered descaling agent are used per slug, or up to 30 mm if approx. 400 each Grams of descaling agent can be used.

Zur Anpassung an Hohlräume verschiedener Durchmesser können Durchlassorgane 1 unterschiedlicher Grössen, auch mit unterschiedlichen Drallwinkeln, insbesondere konische Durchlassorgane für grössere Durchmesser und zylindrische für kleine Durchmesser wahlweise einzeln am Endstück der Rohrleitung 7 für den beladenen Trägergasstrom befestigbar sein.In order to adapt to cavities of different diameters, passage elements 1 of different sizes, also with different swirl angles, in particular conical passage elements for larger diameters and cylindrical ones for small diameters, can optionally be attached individually to the end piece of the pipeline 7 for the laden carrier gas stream.

Nach dem Verfahren wird beispielsweise zum Entzundern der Innenfläche glühender Luppen für die Herstellung nahtloser, 4 bis 12 Meter langer Rohre mit einem Innendurchmesser von 10 bis 35 cm die glühende Luppe an die Einrichtung herangeführt so dass der Luppenhohlraum hinreichend koaxial Durchlassraum des Durchlassorgans ist. Dann wird die Einrichtung durch Betätigung der Verschiebeeinheit 8 nahe an den Hohlraum herangebracht und erforderlichenfalls zentriert, wobei die Muffe 9 nachgibt und gegebenenfalls das (nicht dargestellte) konisch verjüngte Schaufelkranzende als Zentriermittel in den Hohlraum geführt wird. Dann wird zuerst nicht mit dem Entzunderungsmittel beladene Luft mit einem Druck von beispielsweise 6 bar dem Anschluss 14 zugeführt und durch die Düsen 4 in den Hohlraum geblasen. Dabei entstehen zwei schraubenlinienförmige, axial gegeneinander versetzte Strömungen dieser Luft im Hohlraum. Nach 0,5 bis 3 Sekunden wird eine unter einem Druck von z.B. 6 bar stehende, mit dem Entzunderungsmittel beladene Luftmenge von 15 bis 20 Liter (entsprechend 90 bis 120 Liter bei Normaldruck) der Zuleitung 7 zugeführt, ihr wird im Durchlassraum 2 des Durchlassorgans 1 ein Drall erteilt, mit dem sie durch den Hohlraum zusammen mit dem nicht beladenen Luftstrom strömt. Der Drallwinkel der beiden Luftströme ist zweckmässig umso grösser, je grösser der Durchmesser des Hohlraumes der Luppe ist. Dieser Winkel kann 30 bis 60 Grad für Durchmesser von 10 bis 35 cm betragen. Nachdem die mit dem Entzunderungsmittel beladene Luftmenge durch den Hohlraum geströmt ist, wird die Zufuhr der nicht beladenen Luft unterbrochen und die Einrichtung mittels der Verschiebeeinheit 8 zurückgezogen. Daraufhin kann die nächste Luppe entzundert werden.According to the method, for example, to descale the inner surface of glowing blanks for the production of seamless, 4 to 12 meter long tubes with an inner diameter of 10 to 35 cm, the glowing blob is brought to the device so that the slug cavity is sufficiently coaxial passage space of the passage member. Then the device is brought close to the cavity and, if necessary, centered by actuating the displacement unit 8, the sleeve 9 giving way and, if appropriate, the (not shown) tapered blade ring end being guided into the cavity as a centering means. Then, air not loaded with the descaling agent is first supplied to the connection 14 at a pressure of, for example, 6 bar and blown through the nozzles 4 into the cavity. This creates two helical ver, axially against each other put currents of this air in the cavity. After 0.5 to 3 seconds, an air volume of 15 to 20 liters (corresponding to 90 to 120 liters at normal pressure) under a pressure of, for example, 6 bar and loaded with the descaling agent is fed to the feed line 7, it is in the passage space 2 of the passage member 1 issued a swirl with which it flows through the cavity together with the unloaded air flow. The swirl angle of the two air streams is expediently greater, the larger the diameter of the cavity of the bowl. This angle can be 30 to 60 degrees for diameters of 10 to 35 cm. After the amount of air loaded with the descaling agent has flowed through the cavity, the supply of the unloaded air is interrupted and the device is withdrawn by means of the displacement unit 8. The next bobbin can then be descaled.

Claims (12)

1. A method of applying a flowable substance to the inner surface of a hollow body having a continuous, at least approximately cylindrical cavity, in the case of which a carrier gas flow laden with the substance is conducted axially through the cavity after being imparted with spin, characterised in that, prior to or both prior to and during at least part of the duration of the charged carrier gas flow provided with the spin, an additional gas flow which is not charged with the substance is conducted axially through the cavity with a spin which is equidirectional with the spin of the charged carrier gas flow.
2. A method according to claim 1, characterised in that the additional gas flow is conducted through the cavity with a spin the angle of spin of which is less than that of the laden carrier gas flow.
3. A method according to claim 1 or 2, characterised in that the additional gas is conducted into the cavity at locations which are distributed uniformly on the periphery of the cavity, in order to flow through the cavity in several partial flows extending helically against the inner surface.
4. Apparatus for carrying out the method according to one of claims 1 to 3, having a passage component (1) for the carrier gas flow laden with the substance, in the passage chamber (2) of which a spin imparter (3) is arranged, characterised by a device (4) for the supply of the additional gas to the laden carrier gas in the direction thereof and with a spin the direction of rotation of which is equidirectional with that of the laden carrier gas flow.
5. Apparatus according to claim 4, characterised in that the passage component (1) is at a spacing (12) from a discharge nozzle (16) of a supply pipe (7) for the laden carrier gas flow.
6. Apparatus according to claim 4 or 5, characterised by guide vanes (3) which form the spin imparter for the laden carrier gas flow and which extend at the angle of spin with regard to the axis (6) of the passage chamber (2) and which are curved in a channel-like manner, with a radius of curvature increasing in the direction of flow with the hollow channel side in the direction of the direction of rotation (5) of the spin and/or are so curved in the longitudinal direction such that the angle of spin increases in the direction of flow.
7. Apparatus according to one of claims 4 to 6, characterised in that the guide vanes forming the spin giver for the laden carrier gas flow have ends which protrude from the exit of the passage component (1) and the width of which so decreases in the passage direction that the guide-vane ring is tapered in the region of these ends, in order to serve as centring means, engaging into the cavity, for centring the passage component with respect to the cavity.
8. Apparatus according to one of claims 4 to 7, characterised in that the passage chamber (2) of the passage component (1) is cylindrical or for the formation of a diffuser is at least approximately conically widened in the passage direction.
9. Apparatus according to one of claims 4 to 8, characterised in that a hollow displacement body or diffuser cone, open at both ends and conically widened in the passage direction, is arranged in the passage chamber (2) of the passage component (1).
10. Apparatus according to one of claims 4 to 9, characterised in that the passage component (1) has a double-walled jacket (20) for a cooling agent or a heat carrier.
11. Apparatus according to one of claims 4 to 10, characterised in that for the supply of the additional gas which is not laden with the substance with the spin thereof, several nozzles (4) are arranged at the outlet of the passage component (1) distributed uniformly on the periphery thereof, advantageously one nozzle fastened to each of several guide vanes (3) forming the spin giver for the charged carrier gas flow (3).
12. Apparatus according to claim 11, characterised in that the nozzles are Laval nozzles.
EP87107775A 1986-07-03 1987-05-29 Process for applying a fluent material to the inner side of a hollow body, and apparatus for carrying out the process Expired - Lifetime EP0250881B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2682/86 1986-07-03
CH2682/86A CH668717A5 (en) 1986-07-03 1986-07-03 METHOD FOR APPLYING A FLOWABLE SUBSTANCE TO THE INNER SURFACE OF A HOLLOW BODY AND DEVICE FOR CARRYING OUT THE METHOD.

Publications (2)

Publication Number Publication Date
EP0250881A1 EP0250881A1 (en) 1988-01-07
EP0250881B1 true EP0250881B1 (en) 1990-05-09

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Application Number Title Priority Date Filing Date
EP87107775A Expired - Lifetime EP0250881B1 (en) 1986-07-03 1987-05-29 Process for applying a fluent material to the inner side of a hollow body, and apparatus for carrying out the process

Country Status (9)

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US (1) US4790263A (en)
EP (1) EP0250881B1 (en)
JP (1) JPH0771689B2 (en)
CA (1) CA1261684A (en)
CH (1) CH668717A5 (en)
DE (1) DE3762632D1 (en)
ES (1) ES2015918B3 (en)
MX (1) MX170547B (en)
SU (1) SU1620042A3 (en)

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CH674164A5 (en) * 1987-09-29 1990-05-15 Lonza Ag
CH674096A5 (en) * 1988-01-19 1990-04-30 Lonza Ag
CH674477A5 (en) * 1988-03-30 1990-06-15 Lonza Ag
US5099667A (en) * 1989-06-16 1992-03-31 Lonza Ltd. System for suspending and applying solid lubricants to tools or work pieces
DE59102889D1 (en) * 1990-03-26 1994-10-20 Lonza Ag Method and device for spraying a lubricant suspension at intervals.
RU2179077C1 (en) * 2000-05-12 2002-02-10 Поволжский научно-исследовательский институт эколого-мелиоративных технологий Device for applying corrosion-resisting coating on internal surface of pipe-lines
RU2232645C1 (en) * 2002-12-15 2004-07-20 Салдаев Александр Макарович Device for applying anticorrosive material on inner pipeline surface
RU2272681C2 (en) * 2003-09-04 2006-03-27 Алексей Алексеевич Аюков Drive centrifugal spraying head
RU2272682C2 (en) * 2003-09-04 2006-03-27 Алексей Алексеевич Аюков Underwater centrifugal spraying head
RU2283189C1 (en) * 2005-02-22 2006-09-10 Государственное научное учреждение Поволжский научно-исследовательский институт эколого-мелиоративных технологий Российской академии сельскохозяйственных наук Device for applying corrosion-protection insulation on inner side of pipeline
RU2510714C1 (en) * 2012-10-24 2014-04-10 Открытое акционерное общество "Электростальский завод тяжелого машиностроения" Method of cylinders screw rolling
CN112221346B (en) * 2020-10-30 2025-03-25 中国大唐集团科学技术研究院有限公司华东电力试验研究院 An ammonia injection grid for SCR denitration system
CN113663878B (en) * 2021-09-02 2025-01-14 襄阳蓬达高新科技有限公司 A coating head mechanism with multiple working angles

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US679756A (en) * 1901-05-23 1901-08-06 William Bonbright Kennedy Steam and hot-air flue-cleaner.
US998762A (en) * 1911-05-19 1911-07-25 Cement Appliances Company Apparatus for combining comminuted solids and liquid.
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US4055025A (en) * 1976-11-22 1977-10-25 Union Carbide Corporation Apparatus for improved cleaning of pipeline inlets
GB2123917B (en) * 1982-04-30 1986-02-12 Hakko Co Lining underground pipes
US4452169A (en) * 1982-09-24 1984-06-05 Shinich Matsuda Reviving apparatus for fluid passages
CH655516B (en) * 1983-08-17 1986-04-30
DE3562100D1 (en) * 1984-07-23 1988-05-11 Lonza Ag Method and apparatus for pickling work pieces for making tubes
US4668534A (en) * 1986-01-21 1987-05-26 Ben E. Meyers Method and apparatus for applying fusion bonded powder coatings to the internal diameter of tubular goods

Also Published As

Publication number Publication date
CA1261684A (en) 1989-09-26
JPH0771689B2 (en) 1995-08-02
JPS6313614A (en) 1988-01-20
MX170547B (en) 1993-08-31
US4790263A (en) 1988-12-13
SU1620042A3 (en) 1991-01-07
DE3762632D1 (en) 1990-06-13
EP0250881A1 (en) 1988-01-07
CH668717A5 (en) 1989-01-31
ES2015918B3 (en) 1990-09-16

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