Conical Refining Filling

Abstract

A conical refining filling (80) for a conical refiner (10) for refining fibrous material has a first end (80a) of smaller diameter and a second end (80b) of larger diameter. The refining filling has an inner circumference with a refining surface (82) provided with refining bars (84) and refining grooves (86), and an outer circumference (80OC). The refining filing (80) has at least one projecting part (110, 115) projecting away from the outer circumference (80OC) and extending at least partly over the outer circumference (80OC) in at least a partly circumferential direction (CD) of the refining filling (80), and at least one open section extending through or past the at least one projecting part (110, 115).

I claim: 
     
         1 . A conical refining filling for a conical refiner for refining fibrous material, the conical refining filling comprising:
 a body having a first end of smaller diameter and a second end of larger diameter;   portions of the body defining an inner circumference comprising a refining surface provided with refining bars and refining grooves, wherein the body has an outer circumference;   at least one projecting part at the outer circumference of the body, the at least one projecting part projecting away from the outer circumference and extending at least partly over the outer circumference in an at least partly circumferential direction of the refining filling; and   at least one open section extending through or past the at least one projecting part.   
     
     
         2 . The conical refining filling of  claim 1  wherein the projecting part is a flange projecting away from the outer circumference of the body and extending over the outer circumference in the at least partly circumferential direction of the refining filling, wherein the flange comprises a first side surface facing at least partly towards the first end of the refining filling, a second side surface facing at least partly towards the second end of the refining filling and wherein there is at least one open section extending through the flange between the first side surface and the second side surface of the flange. 
     
     
         3 . The conical refining filling of  claim 1  wherein the projecting part is a wing projecting away from the outer circumference and having a finite length extending partly over the outer circumference in the at least partly circumferential direction of the refining filling, and wherein there are at least two wings and at least two open sections extending past the wings on the outer circumference of the refining filling. 
     
     
         4 . The conical refining filling of  claim 1  wherein the open section extending through the projecting part is a hole extending between a first side surface and a second side surface of the projecting part. 
     
     
         5 . The conical refining filling of  claim 1  wherein the open section is a free space in the projecting part or between neighboring projecting parts. 
     
     
         6 . The conical refining filling of  claim 4  wherein the hole is arranged at a root of the projecting part. 
     
     
         7 . The conical refining filling of  claim 5  wherein the free space is arranged at a root of the projecting part. 
     
     
         8 . The conical refining filling of  claim 4  wherein the hole is circular. 
     
     
         9 . The conical refining filling of  claim 1  wherein the refining filling has a longitudinal direction extending between the first end and the second end of the refining filling and wherein the at least one projecting part is arranged in the longitudinal direction of the refining filling closer to the second end of the refining filling than the first end of the refining filling. 
     
     
         10 . The conical refining filling of  claim 1  wherein the refining filling with the projecting part is a solid one-piece element. 
     
     
         11 . The conical refining filling of  claim 1  wherein the refining filling is configured to form a stator for the conical refiner. 
     
     
         12 . The conical refining filling of  claim 1  wherein the projecting part is arranged to form a support element used to support the refining filling in the refiner in place in a longitudinal direction of the refining filling. 
     
     
         13 . A conical refiner for refining fibrous material, the conical refiner comprising:
 a main frame,   a refiner chamber supported to the main frame;   a feed end frame supported to the refiner chamber;   a conical stator surrounded at least partly by the feed end frame;   a conical rotor surrounded at least partly by the conical stator such that there is a refining gap between the stator and the rotor, the refining gap having a first end facing at least partly towards an inlet for fibrous material and a second end extending up to the refiner chamber;   an outlet for the refined fibrous material communicating with the refiner chamber;   wherein the stator comprises a conical refining filling having an inner circumference comprising a refining surface provided with refining bars and refining grooves which faces the rotor, and having an outer circumference, and wherein at least one projecting part extends from the outer circumference, the at least one projecting part projecting away from the outer circumference towards the feed end frame, a recirculation passageway being defined between the outer circumference of the stator and the feed end frame; and   at least one opening defined in the at least one projecting part for the recirculation flow therethrough of fibrous material circulated from the refiner chamber back to the refining gap.   
     
     
         14 . The conical refiner of  claim 13  wherein the at least one projecting part comprises a flange which encircles the stator and wherein the at least one opening comprises a plurality of openings in the flange. 
     
     
         15 . The conical refiner of  claim 13  wherein the at least one projecting part comprises a plurality of wings projecting away from the outer circumference and having a finite length extending partly over the outer circumference of the stator, and the at least one opening comprises open sections extending past the wings. 
     
     
         16 . The conical refiner of  claim 14  wherein the plurality of openings in the flange are circular and extend between a first side surface and a second side surface of the flange. 
     
     
         17 . The conical  claim 14  wherein the refining filling has a longitudinal direction extending between a first end facing the inlet and a second end opposite the first end and wherein the at least one projecting part is arranged in the longitudinal direction of the refining filling closer to the second end of the refining filling than the first end of the refining filling. 
     
     
         18 . A method for refining fibrous material in a conical refiner comprising:
 introducing a fibrous material into an inlet in a conical refiner;   passing the introduced fibrous material to a refining gap between a conical rotor and a conical stator having refining bars and refining gaps thereon thereby refining the fibrous material and discharging it into a refiner chamber; and   passing a first portion of the refined fibrous material from the refiner chamber to a recirculation passage defined between the conical stator and a surrounding frame portion, the first portion of the refined fibrous material entering the recirculation passage through at least one opening in a projecting part which extends outwardly from an outer circumference of the conical stator, the projecting part extending to the surrounding frame portion.