CH267377A

CH267377A - Device intended to increase the dust collection rate of a dust removal cyclone.

Info

Publication number: CH267377A
Authority: CH
Inventors: Airofiltre S A
Original assignee: Airofiltre S A
Priority date: 1946-12-16
Filing date: 1946-12-16
Publication date: 1950-03-31

Description

Dispositif destine ä augmenter 1e taux de captation des poussi'eres dun cyclone de depoussierage. Device intended to increase the dust collection rate of a dust removal cyclone.

Cette inv ention se rapporte ä un disposi tif destine ü augmenter, dune fa@on tres appreciable, 1e taut de captation des poiis sieres d'titi cy clone de depoussierage. Il s'appli que notaminent aux eyclones ayant une ouie interne tangentielle au tobe exterieur et uiie cloison helicoiclale formant guide destine 'i concentrer les poussieres en un filet place sous ce guide dass 1'angle exterieur de eette eloison. This invention relates to a device intended to increase, in a very appreciable way, the dust collection rate of the dusting cy clone. It applies in particular to eyclones having an internal hearing tangential to the exterior tobe and a helical partition forming a guide intended to concentrate the dust in a net placed under this guide in the exterior angle of this partition.

La pratique montre que 1'application si multan6e de ces deux nioyens augmente, dune facon tres sensible, 1'efficacite du cyclone. Le Fait de n'utiliser de preference qu'une seine ouie d'entree et un seil] guide helicoidal effec tuant 1e tour complet dann 1'espace annulaire compris entre les deux tubey concenti-iquea constituant Je eyelone permet de concentrer la poussiere en -Lilie Beule weine dui ne saurait etre obtenue par tont appareil eomportant deux ou plusieurs entrees. Practice shows that the simultaneous application of these two means increases, in a very sensible way, the efficiency of the cyclone. The fact of preferably using only a seine hearing input and a salt] helical guide effec killing the first complete turn in the annular space between the two concentrated tubey constituting I eyelone allows the dust to be concentrated in - Lilie Beule weine dui cannot be obtained by any device having two or more inputs.

La presente invention coneerne un dispo sitif destine ä augmenter 1e taux de capt.a tion de poussieres d'un eyelone de d6poils si6rage, comportant un cylindre muni dune oiiie d'entree tangentielle, dune rampe h6li coidale et dun conduit d'evacuation coaxial.. Ce dispositif est caracterise par 1e fait que le dit condiiit d'evacuation eomporte au moins un orifice pratique dans sa paroi suivant une ligne helicoidale, de maniere ä, deriver du courant traversant 1e eonduit d'evacuation, la faible Partie de ce dernier contenant 1e plus The present invention relates to a operative device intended to increase the dust collection rate of a si6rage eyelone, comprising a cylinder provided with a tangential inlet eyelet, a coidal heli ramp and a coaxial evacuation duct. This device is characterized by the fact that said evacuation pipe has at least one practical orifice in its wall following a helical line, so as to derive from the current passing through the evacuation conduit, the small part of the latter containing 1st plus

de poussieres non retenues au cours du cy clonage Primaire. of dust not retained during Primary cy cloning.

[)ans 1e dessin annexe qui montre schema tiditeinent, ä titre d'exemple, des formes cl'execution du dispositif La fig. 1 est une elevation en coupe du dispositif adapte ä deux cy clones tubulaires travaillant en parallele. [) in the first appended drawing which shows a tentative diagram, by way of example, of the forms of the execution of the device FIG. 1 is a sectional elevation of the device fitted to two tubular cyclones working in parallel.

La fie. '' est une vue en coupe suivant la ligne Il-II de la fig. 1. The fie. '' is a sectional view along the line II-II of FIG. 1.

La fig. 3 est une vtle en coupe partielle seniblable ä la fig. l_ montrant une variante de la elianibre entourant la rainpe de fentes de cette fig. 1. fig. 3 is a partial sectional view similar to FIG. l_ showing a variant of the elianibre surrounding the rainpe of slots of this fig. 1.

La fig. 4 est -Lilie autre vife en coupe dune variante d'execution de la rampe. fig. 4 is -Lilie another sharp cross-section of a variant execution of the ramp.

Dans les fig. 1 et `?, les deux tubes ou eylindres cyclonaires a travaillant en paral lele sont mutiis chacun dune onie interne tangentielle b et d'un gtiide helicoidal c, 1e tout monte dans un caisson d comportant une ouverture e pour l'arrivee des gaz ä, d6pous sierer. Le tube eentral f de sortie ou d'eva cuation des gaz de chaque eyelone comporte une serie d'orifices g pratiqiies Jans sa paroi suivant une ligne helicoidale. Dans 1'exemple represente, ces orifices presentent la forme de fentes. La Partie du tube d'evacuation mu nie des orifices g est entoiiree d'un colleeteur lt cylindrique ou en forme de vol-Lite, relie ä un ventilateur d'aspiration i par une con cluite. La plus Brande Partie des poussieren con- centrees en une veine etroite sous 1'effet de 1'entree tangentielle imique b et du guide he- licdidal c sont evacuees par les fentes de cette campe g. Les poussieren s'echappent par 1e collecteur uz sous Feffet d'aspiration du ven- tilateur i. In Figs. 1 and `?, the two cyclonic tubes or cylinders a working in parallel are each mutiis of a tangential internal tube b and a helicoidal gtiide c, the first all mounted in a box d comprising an opening e for the arrival of gases to, d6pou sierer. The central gas outlet or evacuation tube of each eyelone has a series of orifices g which are practiced in its wall along a helical line. In the example shown, these orifices have the shape of slots. The Portion of the exhaust tube provided with the orifices g is surrounded by a cylindrical or vol-Lite shaped manifold, connected to an exhaust fan i by a connector. The largest part of the dust, concentrated in a narrow vein under the effect of the tangential inlet, b, and the helical guide, c, are evacuated through the slots of this camp, g. The dust escapes through collector uz under the suction effect of fan i.

En effet, 1e mouvement de rotation im- prim6 au courant de gaz par la campe Mi- coidale c se maintient au cours de la remon- t6e ä travers 1e conduit d'evacuation, de Sorte que l.'effet de centrifugation dü ä ce mouve- ment de rotation provoque une concentration des poussieren dann la veine exterieure du cou- rant -de gaz. Il s'ensuit que la Faible Partie du courant traversant 1e condiüt f et derivee par les ouvertures g est celle qui contient la plus Brande Partie des poussieren en Suspen sion dann 1e cour ant gazeux. In fact, the rotational movement imparted to the gas stream by the midcoidal camp c is maintained during the ascent through the evacuation duct, so that the centrifugation effect due to this rotational movement causes a concentration of dust in the outer stream of the gas stream. It follows that the small part of the stream passing through the condition f and diverted by the openings g is that which contains the largest part of the dust in suspension in the gas stream.

Un cyclone ou un groupe de cyclones ,j est dispose ä la Suite du collecteur h pour effec- tuer la centrifugation des poussieren conte- nues dann la ponetion au debit derive par les fentes g. Ce o1 ces cyclones sont de Faible diamUre, de Sorte qu'ils presentent un haut r endement. Dann une variante, ces dernier s cyclones pourraient eire remplaces par un filtre electrostatique: Les ouvertures g effectuent un appel de gaz relativement faible, mais de forte con- centration en poussieren, de Fordre de 5 ä 15% du debit principal. La ligne suivant la- quelle ces ouvertures g sont pratiqiiees est orientee pour que la veine de gaz Faborde 1e plus pres possible au-dessus Jane Platine su- p6rieure h: qui Ferme 1e caisson d. Les fentes g sont etagees pour Former une Sorte de ligne helicoidale dont le module seit strictement celui du filet de poussieren, Pendant 1n tres court chemin, afin de reduire au minimuni 1e debit derive. A cyclone or a group of cyclones ,j is arranged following the collector h to carry out the centrifugation of the dusten contained in the ponetion at the flow diverted through the slits g. Where these cyclones are of small diameter, so that they have a high yield. In a variant, these latter cyclones could be replaced by an electrostatic filter: The openings g perform a relatively weak gas call, but with a high concentration of dust, of the order of 5 to 15% of the main flow. The line along which these openings g are made is oriented so that the gas stream approaches it as close as possible above the upper Platinum Jane h: which closes the caisson d. The slots g are staged to form a sort of helical line whose modulus is strictly that of the dust net, for a very short distance, in order to reduce the drift flow to a minimum.

Les fentes g peuvent comporter eventuel- lement un Petit guide d'entree (non repre- sente) destine ä conduire ä travers les fentes g la veine exterieure du courant traversant 1e conduit c et contenant 1e plug de poussieren. The slits g may optionally include a small entry guide (not shown) intended to lead through the slits g the outer stream of the current passing through the conduit c and containing the dust plug.

Dann 1'exemple de la fig. 3, 1e colleeteur presente la forme dune chambre helicoidale l de sections croissantes dann 1e sens de Fecou- lement du fluide gazeux et ay ant meine pas que la ligne le long de laquelle sont dispo- s6es les fentes g, de maniere ä regulariser 1e debit gazeux derive par chacune des fentes. In the example of FIG. 3, the manifold has the shape of a helical chamber l of sections increasing in the direction of the flow of the gaseous fluid and having not even the line along which the slots g are arranged, so as to regulate the flow gas drifts through each of the slits.

La hauteur des fentes g peut etre de gran- deurs differentes au fur et ä, mesure du ehe- minement des poussieren. The height of the slits g can be of different sizes as the dust moves.

Selon la fig. 4, 1e conduit d'evacuation f eomporte 1n sein orifice presentant la forme dune fente lielicoldale continue RTI ID="0002.0274" WI="4" HE="3" LX="1702" LY="651"> in. La lar- geur de celle-ei peut eire uniforme ou pro gressive dann 1e sens de Fecoulement du fluide gazeux dann 1e conduit d'evacuiation f, Jans le but de prelever 1e maximum de pous sieren ä Faide dune derivation presentant un debit minimum. According to fig. 4, the first evacuation conduit f ecomporte 1n breast orifice having the shape of a continuous lielicoldal slot RTI ID="0002.0274" WI="4" HE="3" LX="1702" LY="651"> in. The width of the latter can be uniform or progressive in the direction of the flow of the gaseous fluid in the evacuation duct f, for the purpose of collecting the maximum amount of dust by means of a bypass having a minimum flow rate.

Claims

CLAIM Device intended to increase the dust collection rate of a polishing cylinder, comprising a cylinder provided with a tangential inlet port, a helical camp and an axial exhaust pipe, characterized by the fact that said evacuation duct comprises at least one practical orifice in its wall following a horizontal line, so as to divert the current passing through the evacuation duct, the small part of the latter containing the most dust, sieres nun retained during the Primary cycle. SOU S-REVENDICATIONS: the.. Device according to. claimed, earae terized by a helicoidal chamber surrounding the first evacuation duct and intended to receive the first by-pass flow, this chamber having the shape of a helicoid, not even the line following which the orifice is arranged practice Jans the wall of the evaeuation duct.

2. Device according to rev endication and sub-claim 1, characterized in that the wall of the duct cl.'evacuation presents a series of orifices arranged along eure lrelieoidale line and which presenterit chaeun the shape of a slot.

3. Device according to claim and sub-claim 1, characterized by the fact that the wall of the evacuation duct comprises a single orifice having the shape of a continuous helical slot of uniform width.

4. Device according to claim and sub-claim 1, characterized by the fact that the wall of the exhaust duct has a single orifice having the shape of a continuous helical slot of increasing width in the direction of the gas flow. in said exhaust pipe.