Ejectors and Methods of Manufacture

Abstract

An ejector has: a motive flow inlet ( 40 ); a secondary flow inlet ( 42 ); an outlet ( 44 ); a motive nozzle ( 204 ); a diffuser ( 118 ); and a control needle ( 132 ) shiftable between a first position and a second position. The ejector comprises: an inlet body ( 210; 400 ) bearing the motive flow inlet and the secondary flow inlet; a diffuser body ( 212 ) forming the diffuser and bearing the outlet; a motive nozzle insert ( 204 ) forming the motive nozzle in a compartment ( 240 ) in the inlet body; and a needle guide insert ( 270 ) in the motive nozzle insert.

1 . An ejector comprising:
 a motive flow inlet ( 40 );   a secondary flow inlet ( 42 );   an outlet ( 44 );   a motive nozzle ( 204 );   a diffuser ( 118 ); and   a control needle ( 132 ) shiftable between a first position and a second position,   
       wherein the ejector comprises:
 an inlet body ( 210 ;  400 ) bearing the motive flow inlet and the secondary flow inlet; 
 a diffuser body ( 212 ) forming the diffuser and bearing the outlet; 
 a motive nozzle insert ( 204 ) forming the motive nozzle in a compartment ( 240 ) in the inlet body; and 
 a needle guide insert ( 270 ) in the motive nozzle insert. 
 
     
     
         2 . The ejector of  claim 1  wherein:
 the needle guide insert ( 270 ) is brazed to the motive nozzle insert. 
 
     
     
         3 . The ejector of  claim 2  wherein:
 the motive nozzle insert is brazed to the compartment. 
 
     
     
         4 . The ejector of  claim 1  wherein:
 the inlet body is a first piece; and 
 the diffuser body is a second piece. 
 
     
     
         5 . The ejector of  claim 1  wherein:
 the inlet body is metallic; and 
 the diffuser body is metallic. 
 
     
     
         6 . The ejector of  claim 1  wherein:
 the inlet body is threaded to the diffuser body. 
 
     
     
         7 . An ejector comprising:
 a motive flow inlet ( 40 );   a secondary flow inlet ( 42 );   an outlet ( 44 );   a motive nozzle ( 204 ); and   a diffuser ( 118 ),   
       wherein the ejector comprises:
 an inlet body ( 210 ;  400 ) bearing the motive flow inlet and the secondary flow inlet; 
 a diffuser body ( 212 ) forming the diffuser and bearing the outlet; and 
 a motive nozzle insert ( 204 ) forming the motive nozzle in a compartment ( 240 ) in the inlet body, said compartment having a downstream-facing surface ( 258 ) abutting an upstream facing surface ( 252 ) of the motive nozzle insert, an upstream end of the motive nozzle insert being within the compartment. 
 
     
     
         8 . The ejector of  claim 7  further comprising:
 a control needle ( 132 ) shiftable between a first position and a second position; and 
 a needle guide insert ( 270 ) in the motive nozzle insert. 
 
     
     
         9 . The ejector of  claim 8  wherein:
 the needle guide insert ( 270 ) is brazed to the motive nozzle insert. 
 
     
     
         10 . The ejector of  claim 7  wherein:
 the motive nozzle insert is brazed to the compartment. 
 
     
     
         11 . The ejector of  claim 7  wherein:
 the inlet body is a first piece; and 
 the diffuser body is a second piece. 
 
     
     
         12 . The ejector of  claim 7  wherein:
 the inlet body is metallic; and 
 the diffuser body is metallic. 
 
     
     
         13 . The ejector of  claim 7  wherein:
 the inlet body is threaded to the diffuser body. 
 
     
     
         14 . A method for manufacturing an ejector, the ejector comprising:
 a motive flow inlet ( 40 );   a secondary flow inlet ( 42 );   an outlet ( 44 );   a motive nozzle ( 204 );   a diffuser ( 118 );   an inlet body ( 210 ;  400 ) bearing the motive flow inlet and the secondary flow inlet;   a diffuser body ( 212 ) forming the diffuser and bearing the outlet; and   a motive nozzle insert ( 204 ) forming the motive nozzle in a compartment ( 240 ) in the inlet body,   
       the method comprising:
 inserting the motive nozzle insert ( 204 ) into the compartment from an opening in a downstream end ( 232 ) of the inlet body; 
 mating the diffuser body to the downstream end of the inlet body. 
 
     
     
         15 . The method of  claim 14  wherein:
 the ejector further comprises:
 a control needle ( 132 ) shiftable between a first position and a second position; and 
 a needle guide insert ( 270 ) in the motive nozzle insert; and 
 
 the method further comprises:
 inserting the needle guide insert into the motive nozzle insert 
 
 
     
     
         16 . The method of  claim 15  further comprising:
 brazing the needle guide insert to the motive nozzle insert. 
 
     
     
         17 . The method of  claim 14  wherein:
 the mating the diffuser body to the downstream end of the inlet body comprises threading. 
 
     
     
         18 . The method of  claim 14  further comprising:
 brazing the motive nozzle insert to the inlet body. 
 
     
     
         19 . The ejector of  claim 1  wherein:
 the needle guide insert has a central bore ( 278 ) for passing and guiding the needle and a plurality of off-center bores ( 280 ) for passing motive flow. 
 
     
     
         20 . The ejector of  claim 7  wherein:
 the motive nozzle insert is press-fit into the compartment.