Liquid centrifugal spraying device with frictionless dynamic sealing

1 . A device for centrifugal spraying of a liquid product comprising:

a rotary electric motor movable in rotation about an axis of rotation, said rotary electric motor comprising a rear portion with a diameter D and an axis of symmetry and a front portion with a diameter d arranged in an extension of said rear portion and with the same axis of symmetry, with d being smaller than D,

a static chamber in the form of a sleeve arranged concentrically with said rotary electric motor with respect to said axis of rotation and partially surrounding the rear portion of said rotary electric motor, said static chamber having a rear face and a front face, said static chamber including a first liquid route for routing the liquid to be sprayed formed longitudinally so as to enable said liquid to flow from the rear face of the static chamber up to the front face of the static chamber,

a support mounted concentrically on the front portion of said electric motor and on which are fastened,

an axisymmetric object, able to be driven in rotation at high speed by said rotary electric motor,

a capsule nested concentrically on said front face of said static chamber, so that an upper face of said capsule is arranged just below said axisymmetric object to avoid any contact with said axisymmetric object, while being separated by a distance ε, said capsule having an internal lateral face surrounding said support, said capsule including a second liquid route for routing the liquid to be sprayed formed longitudinally to enable said liquid to flow from said front face of the static chamber up to a face of said axisymmetric object located opposite the upper face of said capsule, said first and second liquid routes, said capsule and said static chamber being arranged in said centrifugal spraying device so that said first and second liquid routes are in fluidic communication and form a continuous network enabling routing of the liquid to be sprayed from the rear face of the static chamber up to the face of said axisymmetric object located opposite the upper face of said capsule, and

blind orifices formed radially in said support and extending radially towards the axis of rotation, and

wherein said internal lateral face of said capsule has a shape of a divergent nozzle, the shape of the divergent nozzle having a cross-section perpendicular to the axis of rotation, and wherein the cross-section has a diameter that increases up to a level of the upper face of the capsule.

2 . The device according to claim 1 , according to which said continuous network enabling routing of the liquid to be sprayed is sealed using O-ring gaskets arranged respectively between said capsule and said static chamber and between said rotary electric motor and said support.

3 . The device according to claim 1 , further comprising a connector positioned to introduce the liquid to be sprayed in said device, said connector being arranged on the rear face of said static chamber and in fluidic communication with said continuous network.

4 . The device according to claim 1 , according to which the distance & between the upper face of said capsule and said axisymmetric object is between 0.05 mm and 0.5 mm.

5 . The device according to claim 1 , according to which said blind orifices formed radially in said support are in the form of turbine vanes or cylinders.

6 . The device according to claim 1 , further comprising a tachymeter adapted to control a rotational speed of the motor.

7 . The device according to claim 1 , wherein the axisymmetric object comprises a planar disc.