Gas separation: processes – Deflecting
Patent
1992-04-23
1994-01-04
Hart, Charles
Gas separation: processes
Deflecting
153161, 15352, 55302, 55337, 554591, B01D 4600
Patent
active
052756343
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a method of cleaning a cyclone which separates excess powder aspirated from a powder coating cabin, and to a cyclone to be cleaned by this method.
During powder coating, there is a frequent need for a change of paint so that the coating cabin and all auxiliary aggregates which contact the powder, i.e. also the cyclones connected to the cabin must be thoroughly cleaned. As will be explained later in more detail, during operation of the cyclone powder deposits are however encountered in the area between the inner cyclone wall and the immersion tube, especially at the outside of the immersion tube and at the underside of the bottom of the clean gas channel which represents the cyclone top. These powder deposits are only insufficiently removed by the flow of cleaning air. Thus, these areas are still cleaned by hand which is difficult and time consuming and still results only in insufficient cleaning because it is hardly possible to reach all angles and corners. In order to reach this area, a door is provided in the cyclone wall. This is complicated and causes disturbances in the air flow during powder separation since these doors cannot be flush mounted in the cyclone wall. Also, after manual cleaning, it is still required to direct a flow of cleaning gas therethrough in order to remove those powder particles which drop during manual cleaning and adhere to the lower wall areas of the cyclone. Even though provision of the above-mentioned door may be avoided by parting the conical portion of the cyclone or by designing the cyclone as continuous straight cylinder and by conducting the manual cleaning from below; still this is not only very strenuous but results also in a reduced velocity of the flow of cleaning air and in an increased demand of space, especially when several adjoining cyclones should communicate at their underside with a common powder collecting container.
Therefore, it is an object of the invention to create a cleaning method for cyclones of the above-stated type by which the cyclones can be thoroughly cleansed in a relatively short time. Further, it is an object of the invention to design the cyclone such as to be suitable for carrying out the cleaning method.
The solution of the object with regard to the method is attained in accordance with the features of claim 1, while the solution of the object with regard to the apparatus is attained in accordance with the features of claims 2, 5, 8 and 11.
The invention will now be described in more detail with reference to the drawing in which
FIG. 1 shows a vertical section of a group of three cyclones according to a first embodiment, with the cyclone being connected to a common clean gas channel and a common powder collecting chamber,
FIG. 2 shows a vertical section through one of the cyclones of FIG. 1, intersected at a right angle to the drawing plane of FIG. 1,
FIG. 3 shows the group of three cyclones according to FIG. 1, with the immersion tubes being removed,
FIG. 4 shows a partial sectional view through the upper part of a cyclone according to a second embodiment,
FIG. 5 shows a horizontal section taken along the line V--V of FIG. 4,
FIG. 6 shows a vertical section through the upper part of a cyclone according to a third embodiment,
FIG. 7 shows a horizontal section taken along the line VII--VII of FIG. 6, and
FIG. 8 shows a sectional view of the cyclone at a right angle to the drawing plane of FIG. 1, with a filter cartridge being inserted in the cyclone for substitution of an immersion tube.
The embodiment according to FIGS. 1 to 3 constitutes--in contrast to subsequently described embodiments--only a "semi-automatic" solution, which, however, is particularly suitable to explain the basic principle of the invention and is therefore referred to at the beginning of the description.
FIG. 1 shows three adjoining cyclones 10 which are combined to a unit and are connected to one (or several) not shown powder coating cabins from which excess powder is aspirated and recovered in the cyclones 10.
Arranged at the upper en
REFERENCES:
patent: 4859335 (1989-08-01), Whyte
patent: 5066315 (1991-11-01), Haberl et al.
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