Discharge scroll and turbomachine

Abstract

Provided is an exhaust scroll capable of reducing mixing loss caused by fluid swirling inside the exhaust scroll and fluid flowing thereinto, while collecting and discharging the fluid which has flowed. The exhaust scroll is provided with a scroll body ( 11 ) in which a space having a substantially annular cross section is formed and a connecting portion ( 12 ) which connects an exhaust passage ( 8 ) with the scroll body ( 11 ) to forcibly decelerate fluid (A) discharged from the exhaust passage ( 8 ), thereby allowing the fluid (A) to flow into the scroll body ( 11 ).

1 . An exhaust scroll which is connected to an exhaust passage of a turbomachinery and into which fluid discharged from the exhaust passage flows, the exhaust scroll comprising:
 a scroll body in which a space having a substantially annular cross section is formed; and   a connecting portion which connects the exhaust passage with the scroll body to forcibly decelerate the fluid discharged from the exhaust passage, thereby allowing the fluid to flow into the scroll body.   
     
     
         2 . The exhaust scroll according to  claim 1 , wherein
 the connecting portion is provided with an inlet portion connected to the exhaust passage and an outlet portion whose passage area of the fluid is expanded more than the inlet portion to decelerate fluid being flowed by expansion of the passage area.   
     
     
         3 . The exhaust scroll according to  claim 2 , wherein
 the connecting portion separates the fluid along a wall portion connecting from the inlet portion to the outlet portion.   
     
     
         4 . The exhaust scroll according to  claim 3 , wherein
 the connecting portion is disposed all over at the inlet portion of the wall portion or in the vicinity of the inlet portion and provided with a corner for separating the fluid, thereby separating the fluid at the outlet portion side after the fluid passing the corner.   
     
     
         5 . The exhaust scroll according to  claim 1 , wherein
 the connecting portion is provided with a fluid separating portion for forcibly separating the fluid.   
     
     
         6 . A turbomachinery, comprising: the exhaust scroll according to  claim 1 ; and
 an exhaust passage for discharging the fluid into the exhaust scroll.   
     
     
         7 . The exhaust scroll according to  claim 2 , wherein
 the connecting portion is provided with a fluid separating portion for forcibly separating the fluid.   
     
     
         8 . The exhaust scroll according to  claim 3 , wherein
 the connecting portion is provided with a fluid separating portion for forcibly separating the fluid.   
     
     
         9 . The exhaust scroll according to  claim 4 , wherein
 the connecting portion is provided with a fluid separating portion for forcibly separating the fluid.   
     
     
         10 . The turbomachinery, comprising: the exhaust scroll according to  claim 2 ; and
 an exhaust passage for discharging the fluid into the exhaust scroll.   
     
     
         11 . The turbomachinery, comprising: the exhaust scroll according to  claim 3 ; and
 an exhaust passage for discharging the fluid into the exhaust scroll.   
     
     
         12 . The turbomachinery, comprising: the exhaust scroll according to  claim 4 ; and
 an exhaust passage for discharging the fluid into the exhaust scroll.   
     
     
         13 . The turbomachinery, comprising: the exhaust scroll according to  claim 5 ; and
 an exhaust passage for discharging the fluid into the exhaust scroll.