Rotary pressure distributor and carousel-type hollow body treatment machine equipped therewith

Rotary pressure distributor for carousel-type hollow-body treatment machines comprising several identical treatment stations each intended to process at least one hollow body, said rotary distributor comprising two coaxial rings, one of them stationary and the other rotary, which are in contact with one another in a sealed fashion via respective facing contact faces defining a meeting plane, the rotary ring comprising communication orifices each able to be connected to at least one treatment station and opening into the contact face of said rotary ring, said orifices being distributed on several concentric circumferences of different diameters, the stationary ring comprising several slots able to be connected to a pressure source of the machine and opening into the contact face of said stationary ring, said slots being distributed over concentric circumferences of which there are the same number with the same diameters as said orifices so that at least one slot lies in the path of the orifices on each circumference of the rotary ring so that a treatment station is placed in communication with the pressure source when the corresponding orifice faces the respective slot,

• wherein the orifices and/or the slots positioned on the various circumferences have anterior and posterior edges, considered in the direction in which the rotary ring rotates, that are shaped in such a way that, as the orifices slide past the respective slots in the stationary ring, the rates at which the surface area of the passage defined by each orifice and the associated slot increase upon opening and decrease upon closing are substantially the same for all the circumferences,
• all the orifices and/or the slots have substantially the same radial dimension, and
• the anterior and posterior edges, considered in the direction in which the rotary ring rotates, of the orifices and/or of the slots have radii of curvature that are substantially larger in the case of the orifices and/or slots situated on at least the smallest-diameter circumference, and which are substantially smaller in the case of the orifices and/or slots situated on the largest-diameter circumference.