Cover device, integrally bladed main rotor body, method and turbomachine

Abstract

A covering device for an integrally bladed rotor base body of a turbomachine for preventing or reducing a cooling air stream that flows from a high-pressure side to a low-pressure side through channels that are formed between adjacent rotor blades, a plurality of cover elements being provided that are individually insertable into the channels and have at least one peripheral sealing surface. Also an integrally bladed rotor base body having a covering device of this kind, a method for producing such an integrally bladed rotor base body, as well as a turbomachine having such an integrally bladed rotor base body.

1 - 15 . (canceled) 
     
     
         16 . A covering device for an integrally bladed rotor base body of a turbomachine for adjusting a cooling air stream flowing from a high-pressure side to a low-pressure side through channels formed between adjacent rotor blades, the covering device comprising:
 a plurality of cover elements, the cover elements being individually insertable into the channels and having at least one peripheral sealing surface, wherein the cover elements are centrifugally activatable.   
     
     
         17 . The covering device as recited in  claim 16  wherein at least one of the cover elements has at least one sealing surface having an axially shorter extent than the channel accommodating the at least one cover element. 
     
     
         18 . The covering device as recited in  claim 16  wherein the cover elements each having disassemblable individual parts. 
     
     
         19 . The covering device as recited in  claim 18  wherein the cover elements each having two cover disks and a connecting arm releasably interconnecting the cover disks. 
     
     
         20 . The covering device as recited in  claim 16  wherein the cover elements each have overflow openings. 
     
     
         21 . An integrally bladed rotor base body for a turbomachine comprising:
 a plurality of rotor blades; and   a covering device as recited in  claim 16  having the plurality of cover elements for adjusting the cooling air stream, at least one of cover elements having at least one peripheral sealing surface being inserted in the channel.   
     
     
         22 . The integrally bladed rotor base body as recited in  claim 21  wherein the sealing surface is positioned at an end in the channel. 
     
     
         23 . An integrally bladed rotor base body as recited in  claim 21  wherein the cover elements are each configured axially displaceably in the channels and are axially secured by a securing element at least on one side. 
     
     
         24 . A method for producing an integrally bladed rotor base member as recited in  claim 21 , comprising the steps of:
 forming the cover elements to have a cross section in the area of the at least one sealing surface corresponding approximately to a cross section of a channel section that receives the respective cover element; and   positioning the cover elements in the channel sections.   
     
     
         25 . A turbomachine comprising an integrally bladed rotor base body as recited in  claim 21 .