Vacuum ejector pumps

Abstract

Disclosed herein is a vacuum ejector pump operated by compressed air which flows in and out at high velocity, thus creating negative pressure in an outer surrounding space (S). The vacuum ejector pump includes a cylindrical nozzle body ( 2 ) and a cover ( 10 ). The nozzle body has at a predetermined position thereof an opening ( 3 ). One or more mounting nozzles ( 4, 5 ) are coaxially installed in the nozzle body and are visible through the opening ( 3 ). Holes ( 8 ) are formed in the wall of the nozzle body to allow the pump to communicate with the surrounding space (S). The cover functions to cover the opening of the nozzle body. Further, the pump includes flexible valve members ( 9 ) to open or close the holes, and fastening means ( 13, 14 ) to fasten the nozzle body to the cover.

1 . A vacuum ejector pump operated by compressed air which flows in and out at high velocity, thus creating negative pressure in an outer surrounding space S, the vacuum ejector pump comprising: 
 a cylindrical nozzle body ( 2 ) having at a predetermined position thereof an opening ( 3 ), and at least one mounting nozzle ( 4 ,  5 ) which is coaxially installed in the nozzle body and is visible through an opening ( 3 );    a cover ( 10 ) to cover the opening ( 3 ) of the nozzle body ( 2 );    a flexible valve member ( 9 ) provided on a wall of either the nozzle body ( 2 ) or the cover ( 10 ), and opening or closing a hole ( 8 ) which allows the pump to communicate with the surrounding space (S); and    fastening means ( 13 ,  14 ) to fasten the nozzle body ( 2 ) to the cover ( 10 ).    
   
   
       2 . The vacuum ejector pump according to  claim 1 , wherein, when the mounting nozzle ( 4 ,  5 ) comprises a plurality of nozzles, the mounting nozzles ( 4 ,  5 ) are arranged in series in such a way as to be spaced apart from each other.  
   
   
       3 . The vacuum ejector pump according to  claim 1  or  2 , wherein the cover ( 10 ) is made of a transparent material.  
   
   
       4 . The vacuum ejector pump according to  claim 1 , wherein a gasket ( 11 ) is provided to seal a contacting portion of the nozzle body ( 2 ) and the cover ( 10 ).  
   
   
       5 . The vacuum ejector pump according to  claim 4 , wherein the gasket ( 11 ) comprises a bent wing piece ( 12 ) that contacts an outer surface of the nozzle body ( 2 ) and prevents undesirable movement of the gasket ( 11 ).  
   
   
       6 . The vacuum ejector pump according to  claim 1 , wherein the valve member ( 9 ) is integrally provided on the gasket ( 11 ) that seals the contacting portion of the nozzle body ( 2 ) and the cover ( 10 ).  
   
   
       7 . The vacuum ejector pump according to  claim 1 , wherein the fastening means ( 13 ,  14 ) comprises O-rings, the O-rings ( 13 ,  14 ) being fitted to surround contacting portions of opposite ends ( 10   a,    10   b ) of the cover ( 10 ) and a surface of the nozzle body ( 2 ).  
   
   
       8 . The vacuum ejector pump according to  claim 1 , wherein a cylindrical filter ( 17 ) is arranged to be coaxial with the nozzle body ( 2 ) while receiving the nozzle body ( 2 ) therein.