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.

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 , 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 of  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. 
   
   
       15 . 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 of substantially circular cross-section and adapted to be connected to a source also of substantially circular cross-section wherein the abrasive media is introduced into the nozzle under pressure, the inlet end compatible with 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 zone between the inlet end and the outlet end, the transition zone providing a conversion in the axial pathway from the substantially circular inlet cross-section to the substantially rectangular cross-section of the outlet opening along a portion of the longitudinal body;   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;   e. and an expansion zone for dispersing the media.   
   
   
       16 . The nozzle of  claim 15 , wherein the first transition zone and the second transition zone are coexistent along the axial pathway within the longitudinal body. 
   
   
       17 . The nozzle of  claim 15 , wherein the second transition zone extends along a portion of the pathway within the longitudinal body and first reduces the cross-section of the nozzle and then expands the cross-section of the nozzle to provide a Venturii acceleration of the media as it passes through the nozzle. 
   
   
       18 . 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 defining a convergence zone for reducing the cross-sectional area of the axial pathway body intermediately of the inlet end and the outlet end, the convergence zone extending along a portion of the pathway within the longitudinal body and for first reducing the cross-section of the axial pathway within the longitudinal body and then expands the cross-section of the axial pathway within the longitudinal body to provide a Venturii acceleration of the media as it passes through the nozzle, wherein the transition zone and the convergence zone are coexistent along the axial pathway within the longitudinal body.   
   
   
       19 . The nozzle of  claim 18 , wherein the transition zone and the convergence zone are coexistent along the axial pathway within the longitudinal body. 
   
   
       20 . The nozzle of  claim 19 , wherein the convergence zone reduces the cross-sectional area of the axial pathway within the longitudinal body in a plane parallel to the release path. 
   
   
       21 . The nozzle of  claim 19 , wherein the convergence zone reduces the cross-sectional area of the axial pathway within the longitudinal body in a plane perpendicular to the release path. 
   
   
       22 . The nozzle of  claim 19 , wherein the convergence 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.