Flow stator for turbomachine with integrated and attached platforms

Abstract

A stator ring of a flow path, preferably secondary, of a turbomachine, the ring including an inner platform and an outer platform, a plurality of stators extending radially between the two platforms, in which at least one of the two platforms includes a plurality of integrated platforms, each one of the integrated platforms being integral with one of the stators, and the integrated platforms are all of the same shape as one another, and a plurality of attached platforms, each one of the attached platforms being in the form of a part that is assembled and arranged between two integrated platforms, and the attached platforms are also all of the same shape as one another.

1 . A double flow turbomachine comprising a hub, an external collar delimiting with the hub a secondary flow path, and a stator ring of the secondary flow path circulating in said secondary flow path, said ring comprising:
 an internal platform, which forms the flow path at the hub,   an external platform, which forms the flow path at the external collar,   a plurality of stators extending radially between the two platforms,   wherein:   at least one of the two platforms comprises:
 a plurality of integrated platforms, each of the integrated platforms being integral with one of the stators and the integrated platforms all having the same shape, and 
 a plurality of attached platforms, each of the attached platforms being in the form of a part assembled and disposed between two integrated platforms, and the attached platforms also having the same shape. 
   
     
     
         2 . The double flow turbomachine according to  claim 1 , wherein the two platforms each comprise:
 a plurality of integrated platforms, each of the integrated platforms being integral with one of the stators and the integrated platforms all having the same shape, and   a plurality of attached platforms, each of the attached platforms being in the form of a part assembled and disposed between two integrated platforms, and the attached platforms also having the same shape.   
     
     
         3 . The double flow turbomachine according to  claim 1 , wherein the shape of the integrated platforms is determined by the stators having maximum bulk. 
     
     
         4 . The double flow turbomachine according to  claim 3 , wherein the maximum bulk is determined by the superposition of the profiles of the stator comprising the most curved camber line and of the stator comprising the least curved camber line. 
     
     
         5 . The double flow turbomachine according to  claim 1 , wherein the integrated and attached platforms are superposed to facilitate sealing. 
     
     
         6 . The double flow turbomachine according to  claim 1 , wherein the integrated platforms comprise at least one step configured to receive by superposition the attached platforms. 
     
     
         7 . The double flow turbomachine according to  claim 1 , wherein the stators comprise at least one attachment root allowing the attachment of the stator to the external collar or to the hub, said root being situated in the continuation of the stator, beyond the integrated platform, so that the root is situated outside of the secondary flow path. 
     
     
         8 . The double flow turbomachine according to  claim 1 , wherein the stators and the integrated and attached platforms are made of composite material. 
     
     
         9 . The double flow turbomachine according to  claim 1 , wherein at least one stator is a structural arm. 
     
     
         10 . The double flow turbomachine according to  claim 1 , wherein at least one stator is a structural arm with utilities, at least one stator is a structural arm without utilities, and at least one stator is a non-structural vane.