FAN NOZZLE
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 , 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.