FR2813219A1 - DEVICE FOR TREATING ATMOSPHERIC POLLUTIONS, IN PARTICULAR OLFACTIVE - Google Patents

Abstract

- The object of the invention is a device for the treatment of atmospheric pollution, in particular olfactory pollution, characterized in that it comprises a propeller (24) attached to the end of a mast (22) as well as non-return means in the form of a cylindrical wall (26) arranged concentrically with the propeller (24), capable of preventing the appearance of swirling flows at the ends of the blades of said propeller.

Description

DEVICE FOR TREATING ATMOSPHERIC POLLUTIONS,

NOTABLY OLFACTIVE

  The present invention relates to a device for treating atmospheric pollution, in particular olfactory pollution, more particularly suitable for implementing the method described in the patent application.

FR-00 1 1024.

  The method described in this application consists in using a fan comprising a propeller placed at the end of a mast, capable of generating

  a fictitious chimney in order to treat the polluted air by dilution and dispersion.

  On the one hand, dilution makes it possible to mix the polluted air with less or unpolluted air so as to reduce its concentration, and on the other hand, the

  dispersion ensures the rejection at altitude of the diluted polluted air.

  The present invention aims to provide an improved device for setting

implementing said method.

  To this end, the invention relates to a device for the treatment of atmospheric pollution, in particular of olfactory pollution, characterized in that it comprises a propeller attached to the end of a mast and non-return means in the form a cylindrical wall arranged concentrically with the propeller, capable of preventing the appearance of swirling flows at the

  ends of the blades of said propeller.

  Furthermore, this arrangement makes it possible to improve the efficiency of the propeller.

and reduce noise.

  Preferably, the wall is in the form of a convergent so as to accelerate the ejection flow and create a greater depression under the propeller. According to a preferred embodiment, the convergent has an elliptical shape and comprises, at its upstream end according to the air flow, a flange substantially perpendicular to said flow, so as to prevent the appearance

  separation of the flow from the wall at the inlet of the convergent.

  Other characteristics and advantages will emerge from the description which

  will follow the process according to the invention, description given by way of example

  only and with reference to the appended drawings in which: - Figure 1 is a schematic view of the existing device described in patent application FR-00 1 1024, - Figure 2 is a schematic view of the device of the invention, - the FIG. 3 is a sectional view of the device, and

  i 5 - Figure 4 is a half section of a convergent.

  In Figure 1, there is shown a device for implementing a method for the treatment of atmospheric pollution, in particular

  olfactory, as described in application FR-00 1 1024.

  It comprises a frame 10 on which is fixed a mast 12 at the upper end of which is attached a propeller 14. The latter makes it possible to create a fictitious chimney capable of rejecting at altitude the air sucked under the propeller 14, but also a entrainment flow over the propeller likely

  to increase the dilution phenomenon.

  This device may not be entirely satisfactory in certain cases because it generates at the ends of the blades of the propeller swirling flows 16 liable to cause whistling, and does not produce a suction effect sufficient to take off the laminated flows 18 at ground level,

especially in the presence of wind.

  As illustrated by Figures 2 and 3, according to the invention, the device comprises a frame 20 on which is fixed a mast 22 at the end of which is attached a propeller 24 as well as non-return means in the form of a wall 26 cylindrical arranged concentrically with the propeller 24, capable of preventing the appearance of swirling flows. This arrangement allows

  also improve the efficiency of the propeller and reduce noise.

  Advantageously, the wall 26 is in the form of a convergent so as to accelerate the ejection flow and create a greater depression under the propeller 24, capable of taking off the laminated flows 18 at ground level, even

in the presence of wind.

  According to a preferred embodiment, the propeller 24 comprises blades 28 attached to a hub 30 connected to the shaft of a motor 36. In addition, radial arms 32 are provided as means of connection between the wall 26 and the

mast or engine.

  As an indication, the propeller 24 has a diameter varying from 1 to 4 m, is arranged at a height varying from 3 to 7 m and rotates at a speed varying from

600 to 2000 rpm.

  As illustrated in FIG. 4, the convergent preferably has an elliptical shape, and comprises at its upstream end according to the air flow a collar 34 substantially perpendicular to said flow. This flange 34 provides better air guidance and prevents the appearance of detachment of the flow of the

inlet wall of the converging 26.

  Of course, the invention is obviously not limited to the embodiment shown and described above, but on the contrary covers all its variants, in particular with regard to the shape of the convergent 26, its means of connection to the mast or the shape of the propeller and the

used materials.

Claims (4)

  1. Device for treating atmospheric pollution, in particular olfactory pollution, characterized in that it comprises a   propeller (24) attached to the end of a mast (22) as well as anti-   return in the form of a cylindrical wall (26) arranged concentrically with the propeller (24), capable of preventing the appearance of swirling flows at the   ends of the blades of said propeller.   2. Device according to claim 1, characterized in that the wall (26) is in the form of a convergent so as to accelerate the ejection flow and create   greater depression under the propeller (24).   3. Device according to claim 2, the convergent comprises, at its upstream end according to the air flow, a flange (34) substantially perpendicular to said flow, so as to prevent the appearance of a   separation of the flow from the wall at the inlet of the convergent (26).   4. Device according to claim 2 or 3, characterized in that the   i15 converge to an elliptical shape.