FR2466645A2 - RADIAL AUBES WHEEL - Google Patents

Abstract

at. Radial impeller for fans and blowers for pure hot gaseous fluids or those containing dust, preferably flowing from both sides. b. Wheel characterized in that there is provided in the drive element 3 a curved recess 4 having in the embedding zone 6 a shape which corresponds to that of the elastic part following it 5 of the rotary vane 1, zone 6 in which the driving element 3 and the elastic part 5 are rigidly connected, the recess 4 widening into the zone 7 going outside the driving element 3. c. Device applicable to impellers of turbines. (CF DRAWING IN BOPI)

Description

The main patent concerns the paddle wheel arrangement of

  radial construction for pure gaseous or dust-containing gaseous fluids. The invention applies to fans and blowers where most often the gas stream flows from both sides, in particular

  for radial impeller wheels without bottom disc.

  It is known to arrange impellers of radial construction type in such a way that the rotary vanes are fixed on both sides on the bottom disc. On the other side of the vanes is provided each time a cover disc. This solution has the disadvantage that it requires a very large amount of material and that during the circulation of hot gaseous fluids containing dust, adhesions or phenomena occur.

  wear in the area of the bottom disc.

  That is why it has been proposed, in

  the main patent, to mount the rotating blades from one end to the other between the covers and to remove the bottom disc, an elastic part being provided between the rim and

the driving element.

  This elastic portion has to transmit all the forces involved, including static and dynamic bending loads in the area of the connection between the rotating blade and drive element. A disadvantage of this solution lies in the rigid fixation of the part

  elastic on the periphery of the driving element.

  The object of the present invention is to advantageously, technologically and in its adaptation, adapt the connection location between the rotating blade and the drive element and, for this purpose, it makes it possible to connect the rotary blades of the radial blade wheel with the blade. the driving element, so that the connecting location receives the elastic portion of the rotary blade

  and that the elasticity remains obtained.

  To this end, the present invention relates, in the context of the main patent application, to a radial impeller characterized in that the recess of the elastic part of the blade in the drive element is formed in a recess of curved form, divided into at least

two areas.

2.-

  In one of the zones the forms of

  element and the elastic part correspond to each other.

  In this zone the centrifugal forces are absorbed for the most part. In addition, the centering of the rim and the prevention of axial displacement are provided here. In the other zone, the curved recess widens. This zone serves to partially limit the deformation of the elastic portion of the blade. It is advantageous here that the recess comprises, at the location of the outer diameter of the driving element, radii of curvature, preferably of different magnitudes. At the same time the angular displacement between the driving element and the rim resulting from the loads acting in the impeller is limited. The invention will be better understood using

  of the following description and the accompanying drawings

  an exemplary embodiment of the invention, drawings in which: - Figure 1 is a schematic view of a fragment of a radial impeller according to the invention - Figure 2 shows on a larger scale the detail A of Figure 1, - Figure 3 shows the same detail A of

  Figure 1 corresponding to another embodiment.

  The rotating blades 1 are mounted between the wheel covers 2 and form the rim. These blades 1 are

  connected by their elastic part 5 to the driving element 3.

  The driving element 3 comprises for this purpose a recess 4 of curved shape, which is divided into at least two zones. In zone 6, the shape of the curved recess 4

  is in exact conformity with the shape of the elastic part 5.

  In order to prevent axial displacement, the driving element 3 and the elastic part 5 in FIG.

rigid to each other.

  In the zone 7, which is located around the periphery of the driving element 3, the curved recess widens and computes roundings, preferably having different radii of curvature. In this zone 7 acts the elastic part 5 of the blade 1, zone in which are absorbed by this elastic part, in particular, the torques that occur, and o only are limited.

  movements of relatively large amplitude.

  FIG. 3 shows another embodiment of the elastic part 5 of the blade 1. Here the driving element 3 and the elastic part 5 are connected to each other removably by means of a This is only intended to axially block the rim. At the beginning of rotation of the radial vane wheel there is a spring action of the elastic part 5 in the zone 7, whereas against a rigid connection in the

zone 6.

  This has the effect that the charge in zone 6 is of purely static type. It then intervenes a separation between the different loads and they can better

to be mastered.

4.-

Claims (6)

  Radial impeller for blowers and blowers for hot gaseous fluids or those containing dust, preferably flowing on both sides, according to the main patent application, characterized in that it is provided in the driving (3) a curve recess (4) having in the embedding zone (6) a shape which corresponds to that of the elastic part following it (5) of the rotary blade (1), zone (6) ) in which the entraining element (3) and the elastic part (5) are rigidly connected, the recess (4) widening in the region (7)   going outside the driving element (3).   2. Impeller according to claim 1, characterized in that the recess (4) has, at the location of the outer diameter of the drive element (3),   rounded (8), preferably of different radii of curvature.   3.- Paddle wheel according to one or the other   Claims 1 and 2, characterized in that the curvature   the ejection (4) is shaped in an arc.   4.- paddle wheel according to any one   Claims 1 to 3, characterized in that the area   recess (6) has a range equal to or greater than   that of the enlarged zone (7) which follows it.   5. Paddle wheel according to any one of   Claims 1 to 4, characterized in that the recess   (4) has a curvature directed in the direction of rotation.   6.- paddle wheel according to any one of   Claims 1 to 4, characterized in that the recess (4)   has a curvature directed in the opposite direction to the sense of rotation.