Fan nozzle

Abstract

A fan nozzle for cleaning a surface with an abrasive blast media is constructed of a longitudinal body having an axial pathway through which the media is passed under pressure for release from a substantially rectangular cross-sectional outlet to release the media in a substantially flat, wide path. A first transition zone provides a conversion in the axial pathway from the inlet cross-section to the substantially rectangular cross-section of the outlet opening. A second transition or convergence zone first reduces and then expands the cross-section of the axial pathway for providing a Venturii acceleration of the media as it passes through the nozzle. The transition zone and the convergence zone may be coexistent along a portion of the axial pathway.

What is claimed is: 
     
         1 . A nozzle for cleaning a surface with an abrasive blast media, the nozzle comprising:
 a. a longitudinal body having an axial pathway therethrough, an inlet end adapted to be connected to a source wherein the abrasive media is introduced into the nozzle under pressure, the inlet end of a cross-section compatible with the cross-section of the source at the point where the :media is introduced into the nozzle;   b. an outlet end having an opening of a flat, substantially rectangular cross-section for releasing the abrasive media in a wide substantially flat path;   c. a first transition zone between the inlet end and the outlet end, the transition zone providing a conversion in the axial pathway from the inlet cross-section to the substantially rectangular cross-section of the outlet opening along a portion of the longitudinal body; and   d. a second transition zone for reducing the cross-sectional area of the axial pathway body intermediately of the inlet end and the outlet end.   
     
     
         2 . The nozzle of  claim 1 , wherein the first transition zone and the second transition zone are coexistent along the axial pathway within the longitudinal body. 
     
     
         3 . The nozzle of  claim 1 , wherein the cross-section of the inlet end is substantially circular. 
     
     
         4 . The nozzle of  claim 3 , wherein the first transition zone extends along a portion of the axial pathway within the longitudinal body intermediately of the inlet end and the outlet end and provides a conversion from a substantially circular cross-section at the inlet end to a substantially rectangular cross-section at the outlet end. 
     
     
         5 . The nozzle of  claim 4 , wherein the second transition zone extends along a portion of the axial pathway within the longitudinal body and first reduces the cross-section of the axial pathway within the longitudinal body. 
     
     
         6 . The nozzle or  claim 1 , further including an expansion zone between the second transition zone and the outlet for diverging and discharging the media. 
     
     
         7 . The nozzle of  claim 5 , further including an expansion zone between the second transition zone and the outlet for diverging and discharging the media. 
     
     
         8 . The nozzle of  claim 5 , wherein the first transition zone and the second transition zone are coexistent along a portion of the axial pathway within the longitudinal body of the nozzle. 
     
     
         9 . The nozzle of  claim 7 , wherein the cross-section of the inlet end is substantially circular. 
     
     
         10 . The nozzle of  claim 8 , wherein the first transition zone extends along a portion of the pathway within the longitudinal body intermediately of the inlet end and the outlet end and provides a conversion from a substantially circular cross-section at the inlet end to a substantially rectangular cross-section at the outlet end. 
     
     
         11 . The nozzle of  claim 1 , wherein the longitudinal body, including the inlet end, the outlet end and the first transition zone and the second zone are of unitary construction. 
     
     
         12 . The nozzle of  claim 1 , wherein the second transition zone reduces the cross-sectional area of the axial pathway within the longitudinal body in a plane parallel to the release path. 
     
     
         13 . The nozzle of  claim 1 , wherein the second transition zone reduces the cross-sectional area of the axial pathway within the longitudinal body in a plane perpendicular to the release path. 
     
     
         14 . The nozzle of  claim 1 , wherein the second transition zone reduces the cross-sectional area of the axial pathway within the longitudinal body in a plane parallel to the release path and in a plane perpendicular to the release path.