EP0990487A1 - Apparatus for decontaminating surfaces with a jet composed of air, fine grained blasting material and a liquid - Google Patents

Apparatus for decontaminating surfaces with a jet composed of air, fine grained blasting material and a liquid Download PDF

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Publication number
EP0990487A1
EP0990487A1 EP99810874A EP99810874A EP0990487A1 EP 0990487 A1 EP0990487 A1 EP 0990487A1 EP 99810874 A EP99810874 A EP 99810874A EP 99810874 A EP99810874 A EP 99810874A EP 0990487 A1 EP0990487 A1 EP 0990487A1
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EP
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Prior art keywords
mixing chamber
air
chamber
mixture
fine
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EP99810874A
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German (de)
French (fr)
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EP0990487B1 (en
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Patrick Loubeyre
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0084—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a mixture of liquid and gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor

Definitions

  • the present invention relates to a device for surface decontamination, using a compound jet pressurized air, spray material to fine grains and a liquid, including a mixture in the form of a body of revolution fed axially by said liquid and obliquely and eccentrically to the axis of said chamber with the mixture of air and fine-grained material, said chamber communicating with a nozzle of spray.
  • the nozzle on this installation has a very important role because its construction and its geometry allow to give the throw a rotational movement around an axis, which allows to reproduce in a way a movement of friction on the surface to be decontaminated.
  • the nozzle is an element which undergoes wear, if only by the presence of fine-grained material and pressure to which this material is subject. We use in principle of materials with high resistance abrasion by said material. However, after a number of uses, it is necessary to replace said nozzle so that the efficiency of the jet does not is not diminished.
  • the present invention is directed to a nozzle in which the displacement of the aggregate is ensured by air under pressure, the liquid having more of a function comfort, i.e. preventing the dust produced during inconvenient decontamination, on the one hand, the user and, on the other hand, pollutes the ambient air. In certain situations, we can without diminishing the desired effect, interrupt the water supply.
  • the object of the present invention is to provide a new nozzle to overcome drawbacks mentioned above.
  • the decontamination device is characterized in that said device consists of an external body provided with a cylindrical bore housing the mixing chamber, a socket having an approximately cylindrical shape provided with means for being assembled to said body exterior and housing a second body in a bore of revolution constituting said spray nozzle, that said outer body is provided with a first feed inlet in the axial direction of the liquid mixing chamber, and a second inlet whose axis is oblique and offset from to that of the mixing chamber for the entry of the mixture of air and fine-grained material, that said second intake is located so that the mixture air and fine-grained material reaches the wall interior of the mixing chamber near its end located upstream and it is offset by relative to the axis of the mixing chamber to the left when we are on the northern hemisphere and to the right when we are on the southern hemisphere so that the jet air and projection material benefits from the effect of Coriolis.
  • the advantages of the nozzle according to the invention are the fact that it is made up of four main elements, know the outer body receiving the chamber of mixture, the sleeve that protects the nozzle itself which is also a body of revolution which are individually interchangeable, allowing to replace only the worn or damaged part damage instead of replacing the entire device as is the case nowadays.
  • the fact that the air and projection material jet fine grain falls on the end of the chamber allows to use the entire length of the room for him give the desired movement in order to obtain a maximum efficiency at the outlet of the nozzle, contrary to what is done in the devices using liquid as a means of transporting grains.
  • the Coriolis allows to obtain a maximum kinetic energy at the exit of the nozzle therefore a great efficiency. It's obvious that this movement must be done either to the left or to right, depending on the Earth's hemisphere on which one is.
  • the bedroom can be reused if it is turned by example of 180 °, thus doubling the life of the mixing chamber which is an economy substantial. It would also be possible to adjust the life of the room if we turn the room 120 °, which allows an even more substantial saving.
  • the mixing chamber consists of an upstream cylindrical part and a tapered part downstream going in narrowing, this which allows the jet to pass inside the chamber mixing to a section whose diameter weakens to reach the next element which is the nozzle itself.
  • the admission allowing the supply of air and grain material includes a rod made of a material that resists abrasion which is screwed into a body tapping outside and it is surrounded by a sleeve made of preferably in plastic and on this sleeve is fixed by thread or other means the pipe for the supply of air and fine grain material.
  • This construction also allows to have a admission which resists abrasion due to fine-grained material. We can thus replace this rod when worn without having to replace the entire intake system and this allows also to have an item whose cost is not very high, which would be the case if this admission was made from a single piece of durable material abrasion.
  • the mixture also ends on its outer part in tapering cone collaborating with the second body of revolution which has its upstream end a surface complementary allowing by interlocking of form a continuous channel between the mixing chamber and the outlet nozzle.
  • the wall of the mixing chamber includes a conical part upstream going in narrowing inward of the chamber, followed by a cylindrical part, followed by a conical part going in narrowing, that the downstream end of said mixing chamber has an annular surface through which it comes lean on an annular surface corresponding to the second body of revolution.
  • Figure 1 is an axial sectional view of the device according to the present invention.
  • Figure 2 is an axial sectional view only of the mixing chamber and the second body of revolution according to a second variant.
  • the device according to the present invention shown in the figure comprises an outer body 1 provided with a bore 2 inside which is disposed a body of revolution 5 constituting the mixing chamber.
  • the body 1 is provided with an axial threaded passage 13 for the connection of a liquid supply pipe which preferably water, from a second tapping 3 arranged so as to form an angle of about 25 ° to 30 ° with the axis of chamber 5 and the axis of this bore tapped 3 is also slightly offset from the axis of chamber 5 from about 1 to 4 mm to the left of the axis of the mixing chamber with respect to the direction of movement of the jet in order to benefit from the Coriolis effect. If we are in the hemisphere South, this movement will have to be to the right.
  • a threaded rod 11 which is screwed there.
  • Rod 11 is made of abrasion resistant material.
  • a sleeve 12 made of a plastic material provided on its upper part with a device for joining to a conduit.
  • the device can be a bayonet or a thread or any other usual assembly device.
  • the conduit thus formed allows the supply of air and material fine grain from chamber 5.
  • Chamber 5 is arranged inside the body 1, so that the mixture including air and fine grain material comes to touch the wall upstream of the chamber before keep moving inside the room with a helical movement mainly thanks to the eccentric and oblique position of intake 3 and well heard the push of the liquid.
  • a socket 7 is provided with a bore 8 is fixed to the end of the body 1 by any conventional means 4, the simplest being screwed, a seal 14 ensuring sealing.
  • a body of revolution 9 having a passage having a diameter of the order of 10 mm.
  • This body 9 presents in its upstream end a conical surface 10 coming marry the conical end 6 of chamber 5. So, we obtain an assembly allowing to have a passage between the mixing chamber 5 and the body 8 which is continuous ensuring that the jet will be free of protrusions that could affect the quality and jet efficiency.
  • this device is the fact that it is made up of multiple separate elements that can be replaced individually either for wear or to modify the dimensions, for example of the body 9 if the fine grain product should be used with nozzle of different dimensions.
  • the mixture 5 can be made of carbide, body 9 of sintered alumina, the outer body 1 of aluminum or made of elastomer, Nylon, vinyl etc.
  • Socket 7 could also be made of elastomer, vinyl, nylon etc.
  • the chamber 50 has downstream a conical part 51 facilitating the access of air jet and grain material ends followed by a cylindrical part 52 and ending by a new conical part 54.
  • the downstream end of the chamber has an annular surface 55 by which the chamber 50 rests on a surface correspondent 91 of the second body of revolution 90.
  • the internal diameter of this body 90 being smaller that the smallest diameter of the chamber 50, part conical 92 upstream of the body 90 makes it possible to form a continuous passage without abrupt change of section, which would result in turbulence and a wear of the elements present.
  • This configuration of parts 50 and 90 avoids sharp ends which may break due to shock from the arrival of the jet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Cleaning In General (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

The decontamination device is composed of an outer body (1) with a cylindrical bore (2) protecting the mixing chamber (5). A socket (7) assembled to the outer body protects a second bore (8). The outer body has a first inlet (13) for supplying liquid to the mixing chamber and a second sloping inlet (11) for a mixture of fine grain material and air. The second inlet is located so that the air and fine grain material mixture reaches the inner wall of the mixing chamber near its upstream end.

Description

La présente invention concerne un dispositif pour la décontamination des surfaces, au moyen d'un jet composé d'air sous pression, d'une matière de projection à grains fins et d'un liquide, comprenant une chambre de mélange ayant la forme d'un corps de révolution alimentée axialement par ledit liquide et obliquement et de manière excentrée par rapport à l'axe de ladite chambre avec le mélange air et matière à grains fins, ladite chambre communiquant avec une buse de pulvérisation.The present invention relates to a device for surface decontamination, using a compound jet pressurized air, spray material to fine grains and a liquid, including a mixture in the form of a body of revolution fed axially by said liquid and obliquely and eccentrically to the axis of said chamber with the mixture of air and fine-grained material, said chamber communicating with a nozzle of spray.

Il est connu depuis plusieurs années l'utilisation d'installations pour le nettoyage de surfaces, notamment de façades d'immeubles ou de monuments contaminés par la pollution d'atmosphérique ou le passage du temps, voire de manière volontaire (graffitis) . De telles installations comprennent essentiellement l'utilisation d'un jet d'air sous pression comprenant une matière de projection à grains fins communément appelée granulat et l'utilisation d'un liquide qui est, la plupart du temps, de l'eau claire. Un des éléments importants de cette installation, mis à part bien entendu les différentes machines de l'alimentation en air, en eau et de la matière à grains fins est la buse en elle-même montée sur une poignée de commande. Une telle poignée de commande est décrite dans le FR-B 2 753 643 du même inventeur. La buse sur cette installation a un rôle très important car sa construction et sa géométrie permettent de donner au jet un mouvement de rotation autour d'un axe, ce qui permet de reproduire en quelque sorte un mouvement de frottement sur la surface à décontaminer. La buse est un élément qui subit une usure, ne serait-ce que par la présence de la matière à grains fins et de la pression à laquelle cette matière est soumise. On utilise en principe des matériaux présentant une grande résistance à l'abrasion par ladite matière. Néanmoins, après un certain nombre d'utilisations, il est nécessaire de remplacer ladite buse afin que l'efficacité du jet ne soit pas diminuée. Actuellement, lorsque le travail ne se fait plus de manière satisfaisante, on procède au remplacement de la buse au lieu de remplacer uniquement la partie qui a subi l'usure. Cette partie est souvent la partie en amont de la chambre de mélange qui reçoit en premier le jet d'air et la matière à grains fins.It has been known for several years the use facilities for cleaning surfaces, including facades of buildings or monuments contaminated by atmospheric pollution or the passage of time, even on a voluntary basis (graffiti). Such facilities include basically the use of an air jet under pressure comprising a grain spray material purposes commonly called aggregate and the use of a liquid which is, most of the time, clear water. One of the important elements of this installation, put share of course the different machines of supply of air, water and grain material purposes is the nozzle itself mounted on a handle of ordered. Such a control handle is described in FR-B 2 753 643 by the same inventor. The nozzle on this installation has a very important role because its construction and its geometry allow to give the throw a rotational movement around an axis, which allows to reproduce in a way a movement of friction on the surface to be decontaminated. The nozzle is an element which undergoes wear, if only by the presence of fine-grained material and pressure to which this material is subject. We use in principle of materials with high resistance abrasion by said material. However, after a number of uses, it is necessary to replace said nozzle so that the efficiency of the jet does not is not diminished. Currently, when work is not is done more satisfactorily, we proceed to replacing the nozzle instead of replacing only the part which has been subject to wear. This part is often the part upstream of the mixing chamber which receives first the air jet and the fine-grained material.

Dans le document EP-A-0 110 529 on propose un procédé de production basé essentiellement sur la présence d'un liquide sous haute pression qui aspire (effet Venturi) le granulat et l'air pour former un jet, un appareil et une buse pour la mise en oeuvre du procédé.In document EP-A-0 110 529 a method is proposed of production based essentially on the presence of a high pressure liquid which sucks (Venturi effect) the aggregate and the air to form a jet, a device and a nozzle for implementing the method.

Dans le document DE-A-40 02 787 on propose une buse, l'entraínement du granulat étant aussi assuré par un liquide.In document DE-A-40 02 787 a nozzle is proposed, the aggregate training is also provided by a liquid.

La présente invention est dirigée vers une buse dans laquelle le déplacement du granulat est assuré par de l'air sous pression, le liquide ayant plus une fonction de confort, à savoir éviter que la poussière produite lors de la décontamination incommode, d'une part, l'utilisateur et, d'autre part, pollue l'air ambiant. Dans certaines situations, on peut sans diminuer l'effet désiré, interrompre l'alimentation en eau. The present invention is directed to a nozzle in which the displacement of the aggregate is ensured by air under pressure, the liquid having more of a function comfort, i.e. preventing the dust produced during inconvenient decontamination, on the one hand, the user and, on the other hand, pollutes the ambient air. In certain situations, we can without diminishing the desired effect, interrupt the water supply.

La présente invention a pour but de proposer une nouvelle buse permettant de remédier aux inconvénients susmentionnés.The object of the present invention is to provide a new nozzle to overcome drawbacks mentioned above.

Le dispositif de décontamination selon la présente invention est caractérisé par le fait que ledit dispositif est constitué d'un corps extérieur muni d'un alésage cylindrique abritant la chambre de mélange, une douille ayant une forme approximativement cylindrique muni de moyens pour être assemblée audit corps extérieur et abritant dans un alésage un deuxième corps de révolution constituant ladite buse de pulvérisation, que ledit corps extérieur est muni d'une première admission pour l'alimentation dans le sens axial de la chambre de mélange en liquide, et d'une deuxième admission dont l'axe est oblique et décalé par rapport à celui de la chambre de mélange pour l'entrée du mélange air et matière à grains fins, que ladite deuxième admission est située de sorte que le mélange air et matière à grains fins atteigne la paroi intérieure de la chambre de mélange à proximité de son extrémité située en amont et elle est décalée par rapport à l'axe de la chambre de mélange vers la gauche lorsqu'on est sur l'hémisphère Nord et vers la droite lorsqu'on est sur l'hémisphère Sud de sorte que le jet d'air et matière de projection bénéficie de l'effet de Coriolis.The decontamination device according to this invention is characterized in that said device consists of an external body provided with a cylindrical bore housing the mixing chamber, a socket having an approximately cylindrical shape provided with means for being assembled to said body exterior and housing a second body in a bore of revolution constituting said spray nozzle, that said outer body is provided with a first feed inlet in the axial direction of the liquid mixing chamber, and a second inlet whose axis is oblique and offset from to that of the mixing chamber for the entry of the mixture of air and fine-grained material, that said second intake is located so that the mixture air and fine-grained material reaches the wall interior of the mixing chamber near its end located upstream and it is offset by relative to the axis of the mixing chamber to the left when we are on the northern hemisphere and to the right when we are on the southern hemisphere so that the jet air and projection material benefits from the effect of Coriolis.

Les avantages de la buse selon l'invention sont le fait qu'elle est constituée de quatre éléments principaux, à savoir le corps extérieur recevant la chambre de mélange, la douille qui protège la buse en elle-même qui est également un corps de révolution qui sont interchangeables de manière individuelle, ce qui permet de ne remplacer que la partie usée ou ayant subi un dégât au lieu de remplacer la totalité du dispositif comme c'est le cas pratiquement actuellement. D'autre part, le fait que le jet air et matière de projection à grains fins tombe sur l'extrémité de la chambre permet d'utiliser toute la longueur de la chambre pour lui donner le mouvement désiré afin d'obtenir une efficacité maximale à la sortie de la buse, contrairement à ce qui se fait dans les dispositifs utilisant le liquide comme moyen pour véhiculer les grains. En plus, le fait que la deuxième admission est décalée par rapport à l'axe de la chambre de mélange de sorte que le jet d'air et de matière de projection bénéficie de l'accélération, le Coriolis permet d'obtenir une énergie cinétique maximum à la sortie de la buse donc une grande efficacité. Il est évident que ce déplacement doit se faire, soit à gauche, soit à droite, en fonction de l'hémisphère terrestre sur lequel on se trouve.The advantages of the nozzle according to the invention are the fact that it is made up of four main elements, know the outer body receiving the chamber of mixture, the sleeve that protects the nozzle itself which is also a body of revolution which are individually interchangeable, allowing to replace only the worn or damaged part damage instead of replacing the entire device as is the case nowadays. Else apart, the fact that the air and projection material jet fine grain falls on the end of the chamber allows to use the entire length of the room for him give the desired movement in order to obtain a maximum efficiency at the outlet of the nozzle, contrary to what is done in the devices using liquid as a means of transporting grains. In addition, the fact that the second admission is offset from the axis of the mixing chamber of so the jet of air and projection material benefits from acceleration, the Coriolis allows to obtain a maximum kinetic energy at the exit of the nozzle therefore a great efficiency. It's obvious that this movement must be done either to the left or to right, depending on the Earth's hemisphere on which one is.

Un autre avantage également est le fait que la chambre de mélange peut être réutilisée si on l'a tourne par exemple de 180 °, en doublant ainsi la vie de la chambre de mélange, ce qui est une économie substantielle. Il serait également possible de régler la vie de la chambre si on tourne la chambre de 120°, ce qui permet une économie encore plus substantielle. Ainsi, pour l'élément qui subit l'usure la plus forte, on peut soit prolonger sa vie en la tournant de 180° ou 120° à l'intérieur du corps extérieur, soit la remplacer bien avant le remplacement de la buse qui subit une usure moins forte et en tous cas une usure symétrique puisque dans cette partie, le jet se déplace de manière hélicoïdale, mais toujours dans le sens tangentiel par rapport à la paroi de la buse, ce qui n'est pas le cas du jet lorsqu'il frappe la première fois la partie en amont de la paroi de la chambre de mélange.Another advantage is that the bedroom can be reused if it is turned by example of 180 °, thus doubling the life of the mixing chamber which is an economy substantial. It would also be possible to adjust the life of the room if we turn the room 120 °, which allows an even more substantial saving. Thus, for the element which undergoes the strongest wear, you can either extend your life by turning it 180 ° or 120 ° inside the external body, i.e. replace well before replacing the nozzle which undergoes less wear and in any case wear symmetrical since in this part, the jet moves helically, but always in the direction tangential to the wall of the nozzle, which the jet is not the case when it strikes the first times the upstream portion of the chamber wall mixed.

Selon une variante d'exécution, la chambre de mélange est formée d'une partie cylindrique en amont et d'une partie conique en aval en allant en se rétrécissant, ce qui permet au jet de passer à l'intérieur de la chambre de mélange vers une section dont le diamètre s'affaiblit pour atteindre l'élément suivant qui est la buse elle-même.According to an alternative embodiment, the mixing chamber consists of an upstream cylindrical part and a tapered part downstream going in narrowing, this which allows the jet to pass inside the chamber mixing to a section whose diameter weakens to reach the next element which is the nozzle itself.

Selon une autre variante d'exécution, l'admission permettant l'alimentation en air et en matière à grains comprend une tige faite d'un matériau qui résiste à l'abrasion qui est vissée dans un taraudage du corps extérieur et il est entouré d'un manchon fait de préférence en une matière plastique et sur ce manchon vient se fixer par un filetage ou autre moyen le tuyau pour l'alimentation en air et en matière à grains fins.According to another variant, the admission allowing the supply of air and grain material includes a rod made of a material that resists abrasion which is screwed into a body tapping outside and it is surrounded by a sleeve made of preferably in plastic and on this sleeve is fixed by thread or other means the pipe for the supply of air and fine grain material.

Cette construction permet également d'avoir une admission qui résiste bien à l'abrasion due à la matière à grains fins. On peut ainsi remplacer cette tige lorsqu'elle est usée sans avoir à remplacer la totalité du dispositif d'admission et ceci permet également d'avoir un élément dont le coût n'est pas très élevé, ce qui serait le cas si cette admission était faite d'une seule pièce en un matériau résistant à l'abrasion. This construction also allows to have a admission which resists abrasion due to fine-grained material. We can thus replace this rod when worn without having to replace the entire intake system and this allows also to have an item whose cost is not very high, which would be the case if this admission was made from a single piece of durable material abrasion.

Selon une autre variante d'exécution, la chambre de mélange se termine aussi sur sa partie extérieure en cône qui se rétrécit collaborant avec le deuxième corps de révolution qui a son extrémité en amont une surface complémentaire permettant ainsi par emboítement de former un canal continu entre la chambre de mélange et la buse de sortie.According to another alternative embodiment, the mixture also ends on its outer part in tapering cone collaborating with the second body of revolution which has its upstream end a surface complementary allowing by interlocking of form a continuous channel between the mixing chamber and the outlet nozzle.

Selon une autre variante d'exécution, la paroi de la chambre de mélange comprend en amont une partie conique allant en se rétrécissant vers l'intérieur de la chambre, suivie d'une partie cylindrique, suivie d'une partie conique allant en se rétrécissant, que l'extrémité en aval de ladite chambre de mélange présente une surface annulaire par laquelle elle vient s'appuyer sur une surface annulaire correspondante au deuxième corps de révolution.According to another alternative embodiment, the wall of the mixing chamber includes a conical part upstream going in narrowing inward of the chamber, followed by a cylindrical part, followed by a conical part going in narrowing, that the downstream end of said mixing chamber has an annular surface through which it comes lean on an annular surface corresponding to the second body of revolution.

L'invention sera décrite plus en détail à l'aide du dessin.The invention will be described in more detail using the drawing.

La figure 1 est une vue en coupe axiale du dispositif selon la présente invention.Figure 1 is an axial sectional view of the device according to the present invention.

La figure 2 est une vue en coupe axiale uniquement de la chambre de mélange et du deuxième corps de révolution selon une deuxième variante d'exécution.Figure 2 is an axial sectional view only of the mixing chamber and the second body of revolution according to a second variant.

Le dispositif selon la présente invention représenté à la figure comprend un corps extérieur 1 muni d'un alésage 2 à l'intérieur duquel est disposé un corps de révolution 5 constituant la chambre de mélange. Le corps 1 est muni d'un passage taraudé axial 13 pour le branchement d'un conduit d'alimentation en liquide qui de préférence sera de l'eau, d'un deuxième taraudage 3 disposé de sorte à former un angle de l'ordre de 25° à 30° avec l'axe de la chambre 5 et l'axe de cet alésage taraudé 3 est également légèrement décalé par rapport à l'axe de la chambre 5 d'environ 1 à 4 mm vers la gauche de l'axe de la chambre de mélange par rapport à la direction du déplacement du jet afin de bénéficier de l'effet de Coriolis. Si on se trouve dans l'hémisphère Sud, il faudra que ce déplacement soit vers la droite. De cette manière on obtient une énergie cinétique maximum en utilisant en plus toute la longueur de la chambre 5. A l'intérieur de ce taraudage est disposée une tige filetée 11 qui vient s'y visser. La tige 11 est faite d'un matériau résistant à l'abrasion. Autour de cette tige 11 est fixé un manchon 12 fait d'un matériau plastique muni sur sa partie supérieure d'un dispositif pour l'assemblage à un conduit. Le dispositif peut être une baïonnette ou un filetage ou tout autre dispositif d'assemblage usuel. Le conduit ainsi formé permet l'alimentation en air et en matière à grains fins de la chambre 5. La chambre 5 est disposée à l'intérieur du corps 1, de sorte que le mélange comprenant l'air et la matière à grains fins vient toucher la paroi en amont de la chambre avant de continuer à avancer à l'intérieur de la chambre avec un mouvement hélicoïdal grâce essentiellement à la position excentrée et oblique de l'admission 3 et bien entendu la poussée du liquide.The device according to the present invention shown in the figure comprises an outer body 1 provided with a bore 2 inside which is disposed a body of revolution 5 constituting the mixing chamber. The body 1 is provided with an axial threaded passage 13 for the connection of a liquid supply pipe which preferably water, from a second tapping 3 arranged so as to form an angle of about 25 ° to 30 ° with the axis of chamber 5 and the axis of this bore tapped 3 is also slightly offset from the axis of chamber 5 from about 1 to 4 mm to the left of the axis of the mixing chamber with respect to the direction of movement of the jet in order to benefit from the Coriolis effect. If we are in the hemisphere South, this movement will have to be to the right. In this way we obtain kinetic energy maximum using in addition the entire length of the chamber 5. Inside this tapping is arranged a threaded rod 11 which is screwed there. Rod 11 is made of abrasion resistant material. Around from this rod 11 is fixed a sleeve 12 made of a plastic material provided on its upper part with a device for joining to a conduit. The device can be a bayonet or a thread or any other usual assembly device. The conduit thus formed allows the supply of air and material fine grain from chamber 5. Chamber 5 is arranged inside the body 1, so that the mixture including air and fine grain material comes to touch the wall upstream of the chamber before keep moving inside the room with a helical movement mainly thanks to the eccentric and oblique position of intake 3 and well heard the push of the liquid.

Une douille 7 est munie d'un alésage 8 vient se fixer à l'extrémité du corps 1 par tout moyen conventionnel 4, le plus simple étant à vissage, un joint 14 assurant l'étanchéité. A l'intérieur de l'alésage 8 est disposé un corps de révolution 9 présentant un passage ayant un diamètre de l'ordre de 10 mm. Ce corps 9 présente dans son extrémité en amont une surface conique 10 venant épouser l'extrémité conique 6 de la chambre 5. Ainsi, on obtient un assemblage permettant d'avoir un passage entre la chambre de mélange 5 et le corps 8 qui est continu assurant que le jet sera exempt de protubérances qui pourraient nuire à la qualité et l'efficacité du jet.A socket 7 is provided with a bore 8 is fixed to the end of the body 1 by any conventional means 4, the simplest being screwed, a seal 14 ensuring sealing. Inside the bore 8 is arranged a body of revolution 9 having a passage having a diameter of the order of 10 mm. This body 9 presents in its upstream end a conical surface 10 coming marry the conical end 6 of chamber 5. So, we obtain an assembly allowing to have a passage between the mixing chamber 5 and the body 8 which is continuous ensuring that the jet will be free of protrusions that could affect the quality and jet efficiency.

Comme mentionné précédemment, l'intérêt de ce dispositif est le fait qu'il est composé de plusieurs éléments séparés qui peuvent être remplacés individuellement soit pour des questions d'usure, soit pour modifier les dimensions, par exemple du corps 9 si le produit à grains fins doit être utilisé avec une buse de dimensions différentes.As mentioned earlier, the value of this device is the fact that it is made up of multiple separate elements that can be replaced individually either for wear or to modify the dimensions, for example of the body 9 if the fine grain product should be used with nozzle of different dimensions.

Il est également à noter que lorsque le jet avec l'air et la matière à grains fins tombe à l'extrémité de la chambre 5 provoque une usure qui est localisée à l'endroit de l'impact et qu'après un certain nombre d'utilisations peut nuire à la qualité du jet.It should also be noted that when the jet with air and the fine-grained material falls to the end of the chamber 5 causes wear which is localized at the place of impact and that after a certain number of uses can affect the quality of the spray.

Dans ce cas, il est nécessaire de remplacer la chambre 5, ce qui peut être fait sans remplacer la totalité du dispositif ou comme mentionnée précédemment tourner cette chambre de 180° ou d'un tiers de tour afin d'utiliser l'autre partie de la chambre qui n'est pas touchée par le jet et qui en réalité ne perturbe pas les qualités dynamiques de la buse puisque cette partie de la surface de la chambre n'entre pas en contact avec le mélange air et la matière à grains fins que seulement sur la partie de l'impact, ensuite le jet avance hélicoïdalement.In this case, it is necessary to replace the chamber 5, which can be done without replacing the entire device or as mentioned previously turn this 180 ° chamber or a third of a turn so to use the other part of the room which is not hit by the jet and which in reality does not disturb the dynamic qualities of the nozzle since this part of the surface of the chamber does not come into contact with the air and fine-grained material mixture only on the impact part, then the jet advances helically.

A titre d'exemple, on peut mentionner que la chambre de mélange 5 peut être faite en carbure, le corps 9 en alumine frittée, le corps extérieur 1 en aluminium ou en élastomère, Nylon, vinyle etc. La douille 7 pourrait aussi être faite en élastomère, en vinyle, Nylon etc.As an example, it can be mentioned that the mixture 5 can be made of carbide, body 9 of sintered alumina, the outer body 1 of aluminum or made of elastomer, Nylon, vinyl etc. Socket 7 could also be made of elastomer, vinyl, nylon etc.

Selon une variante d'exécution représentée à la figure 2, la chambre 50 présente en aval une partie conique 51 facilitant l'accès de jet d'air et matière à grains fins suivie d'une partie cylindrique 52 et terminant par une nouvelle partie conique 54. L'extrémité en aval de la chambre présente une surface annulaire 55 par laquelle la chambre 50 s'appuie sur une surface correspondante 91 du deuxième corps de révolution 90. Le diamètre intérieur de ce corps 90 étant plus petit que le plus petit diamètre de la chambre 50, une partie conique 92 en amont du corps 90 permet de former un passage continu sans changement brusque de la section, ce qui aurait comme conséquence des turbulences et une usure des éléments en présence. Cette configuration des pièces 50 et 90 évite des extrémités aiguës qui risquent de se casser lors de chocs provoqués par l'arrivée du jet.According to an alternative embodiment shown in Figure 2, the chamber 50 has downstream a conical part 51 facilitating the access of air jet and grain material ends followed by a cylindrical part 52 and ending by a new conical part 54. The downstream end of the chamber has an annular surface 55 by which the chamber 50 rests on a surface correspondent 91 of the second body of revolution 90. The internal diameter of this body 90 being smaller that the smallest diameter of the chamber 50, part conical 92 upstream of the body 90 makes it possible to form a continuous passage without abrupt change of section, which would result in turbulence and a wear of the elements present. This configuration of parts 50 and 90 avoids sharp ends which may break due to shock from the arrival of the jet.

Claims (5)

Dispositif pour la décontamination des surfaces, au moyen d'un jet composé d'air sans pression, d'une matière de projection à grains fins et d'un liquide, comprenant une chambre de mélange (5, 50) ayant la forme d'un corps de révolution alimentée axialement (13) par ledit liquide et obliquement (3, 11) et de manière excentrée par rapport à l'axe de ladite chambre (5, 50) avec le mélange air et matière à grains fins, ladite chambre communiquant avec une buse de pulvérisation (7, 9 ; 90), caractérisé par le fait que ledit dispositif est constitué d'un corps extérieur (1) muni d'un alésage cylindrique (2) abritant la chambre de mélange (5, 50), une douille (7) ayant une forme approximativement cylindrique muni de moyens (4, 14) pour être assemblée audit corps extérieur (1) et abritant dans un alésage (8) un deuxième corps de révolution constituant ladite buse de pulvérisation, que ledit corps extérieur (1) est muni d'une première admission (13) pour l'alimentation dans le sens axial de la chambre de mélange (5, 50) en liquide, et d'une deuxième admission (3, 11) dont l'axe est oblique et décalé par rapport à celui de la chambre de mélange pour l'entrée du mélange air et matière à grains fins, que ladite deuxième admission (3, 11) est située de sorte que le mélange air et matière à grains fins atteigne la paroi intérieure de la chambre de mélange (5, 50) à proximité de son extrémité située en amont et elle est décalée par rapport à l'axe de la chambre de mélange vers la gauche lorsqu'on est sur l'hémisphère Nord et vers la droite lorsqu'on est sur l'hémisphère Sud de sorte que le jet d'air et de matière de projection bénéficie de l'effet de Coriolis. Device for the decontamination of surfaces, by means of a jet composed of air without pressure, of a material fine grain spray and liquid, comprising a mixing chamber (5, 50) having the shape of a body of revolution fed axially (13) by said liquid and obliquely (3, 11) and eccentrically by relative to the axis of said chamber (5, 50) with the mixture air and fine-grained material, said chamber communicating with a spray nozzle (7, 9; 90), characterized by the fact that said device consists of a body exterior (1) provided with a cylindrical bore (2) housing the mixing chamber (5, 50), a sleeve (7) having a approximately cylindrical shape provided with means (4, 14) to be assembled to said external body (1) and sheltering in a bore (8) a second body of revolution constituting said spray nozzle, that said outer body (1) is provided with a first inlet (13) for feeding in the axial direction of the liquid mixing chamber (5, 50), and a second intake (3, 11) whose axis is oblique and offset from that of the mixing chamber for the entry of the air and fine-grained material mixture, which said second intake (3, 11) is located so that the mixture of air and fine-grained material reaches the wall inside the nearby mixing chamber (5, 50) from its upstream end and it is offset by relative to the axis of the mixing chamber to the left when we are on the northern hemisphere and to the right when we are on the southern hemisphere so that the jet of air and projection material benefits from the effect of Coriolis. Dispositif selon la revendication 1, caractérisé par le fait que la chambre de mélange (5, 50) comprend une partie cylindrique (22) et se termine en aval par une partie conique (6 ; 23, 24) allant en se rétrécissant.Device according to claim 1, characterized by the fact that the mixing chamber (5, 50) includes a cylindrical part (22) and ends downstream by a conical part (6; 23, 24) narrowing. Dispositif selon l'une quelconque des revendications 1 ou 2, caractérisé par le fait que l'admission pour l'alimentation du mélange air et matière à grains fins comprend une tige creuse (11) faite d'un matériau résistant à l'abrasion vissée dans un taraudage (3) du corps extérieur (1), qu'un manchon (12) en matériau plastique entoure cette tige (11) et il est muni de moyens pour permettre d'y assembler un conduit d'alimentation avec ledit mélange.Device according to any one of claims 1 or 2, characterized in that the admission for feeding the air and fine grain material mixture includes a hollow rod (11) made of a material abrasion resistant screwed into a thread (3) of the outer body (1), than a sleeve (12) of material plastic surrounds this rod (11) and it is provided with means for assembling a conduit therein feed with said mixture. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé par le fait que la partie extérieure de l'extrémité de la chambre (5) de mélange située en aval est conique (6), tandis que l'extrémité amont de la buse (9) présente une ouverture complémentaire (10) permettant un emboítement intime entre l'extrémité aval de la chambre de mélange (5)avec l'extrémité en amont de la buse (9).Device according to any one of claims 1 to 3, characterized in that the outer part of the end of the mixing chamber (5) located downstream is conical (6), while the upstream end of the nozzle (9) has a complementary opening (10) allowing an intimate interlocking between the downstream end of the mixing chamber (5) with the upstream end of the nozzle (9). Dispositif selon la revendication 1, caractérisé par le fait que la paroi de la chambre de mélange (50) comprend en amont une partie conique (51) allant en se rétrécissant vers l'intérieur de la chambre, suivie d'une partie cylindrique (52), suivie d'une nouvelle partie conique (53, 54) allant en se rétrécissant, que l'extrémité en aval de ladite chambre de mélange présente une surface annulaire (55) par laquelle elle vient s'appuyer sur une surface annulaire correspondante (91) du deuxième corps de révolution (90).Device according to claim 1, characterized by the fact that the wall of the mixing chamber (50) upstream comprises a conical part (51) running in narrowing towards the inside of the chamber, followed by a cylindrical part (52), followed by a new part conical (53, 54) narrowing, that the downstream end of said mixing chamber has an annular surface (55) through which it comes lean on a corresponding annular surface (91) of the second body of revolution (90).
EP99810874A 1998-09-29 1999-09-28 Apparatus for decontaminating surfaces with a jet composed of air, fine grained blasting material and a liquid Expired - Lifetime EP0990487B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9812171 1998-09-29
FR9812171A FR2783735B1 (en) 1998-09-29 1998-09-29 DEVICE FOR THE DECONTAMINATION OF SURFACES BY MEANS OF A JET COMPOSED OF AIR, A FINE-GRAINED SPRAYING MATERIAL AND A LIQUID

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EP0990487A1 true EP0990487A1 (en) 2000-04-05
EP0990487B1 EP0990487B1 (en) 2002-07-10

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US (1) US6390899B1 (en)
EP (1) EP0990487B1 (en)
AT (1) ATE220362T1 (en)
DE (1) DE69902082T2 (en)
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US8353741B2 (en) * 2009-09-02 2013-01-15 All Coatings Elimination System Corporation System and method for removing a coating from a substrate
KR101220608B1 (en) * 2010-06-09 2013-01-10 주식회사 포스코 Descaling Apparatus
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FR2783735A1 (en) 2000-03-31
ATE220362T1 (en) 2002-07-15
US6390899B1 (en) 2002-05-21
DE69902082T2 (en) 2003-02-06
EP0990487B1 (en) 2002-07-10
ES2182472T3 (en) 2003-03-01
FR2783735B1 (en) 2000-12-15
DE69902082D1 (en) 2002-08-14

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