Neck for turbine ventilator

Abstract

A typical turbine roof ventilator includes a turbine hood having a closed end, a ring spaced from the closed end and a series of spaced blades extending from the ring to the closed end. A novel sleeve assembly is disclosed including a first sleeve portion having a first open end and a second open end and a second sleeve portion defining a third and a fourth open end. The third end of the second sleeve portion is partly located inside the second end of the first sleeve. The second sleeve is hinged to the first sleeve portion about a pivot axis. The outside diameter of first sleeve portion is slightly smaller than the inside diameter of the second sleeve portion. Both sleeves are at least part spherical such that the second and first sleeve portions can be relatively freely rotated relative to each other about the pivot axis so that the relative angle between planes defined by the first end of the first sleeve axis and the fourth end of the second sleeve may be adjusted. Typically, the first end of the first sleeve and the forth end of the second sleeve are generally annular.

1 . A sleeve assembly for a turbine roof ventilator comprising: 
 a first sleeve portion having a first open end and a second open end and defining a central axis passing through the centre of the sleeve from the first end of the sleeve to the second end; and    a second sleeve portion defining a third and a fourth open end and defining a second central axis; wherein 
 in use, the third end of the second sleeve portion is at least partly located inside the second end of the first sleeve, the first sleeve being hinged to the second sleeve portion about a pivot axis which is located at or near the intersection of the first and second central axes and which is generally perpendicular to said central axes, the outside diameter of said second sleeve portion being smaller than, or an interference fit with, the inside diameter of the first sleeve portion and both sleeves being at least part spherical such that the second and first sleeve portions can be relatively freely rotated relative to each other about the pivot axis so that the relative angle between planes defined by the first end of the first sleeve axis and the fourth end of the second sleeve may be adjusted.  
   
     
     
         2 . A sleeve assembly as claimed in  claim 1  wherein a central portion of both the first and second sleeve portions are part spherical and wherein the first end of the first sleeve and the fourth end of the second sleeve are generally annular.  
     
     
         3 . A sleeve assembly as claimed in  claim 2  wherein the first and second sleeve portions are configured such that the relative angle defined between the planes defined by the first end of the first sleeve and the fourth end of the second sleeve may be adjusted between 0° wherein the planes are parallel, and about 32°.  
     
     
         4 . A sleeve assembly as claimed in  claim 1  wherein the first sleeve defines one or more depressions located near its second end for receiving screws for fixing the two sleeve portions together relative to one another.  
     
     
         5 . A sleeve assembly as claimed in  claim 1  wherein markings are moulded, printed or otherwise marked on the exterior of the sleeve assembly which are indicative of the relative orientation of the sleeves in the assembly.  
     
     
         6 . A sleeve assembly as claimed in  claim 1  wherein a hinge is defined by a part spherical bulge on the second sleeve located inside a mating depression formed by a relatively larger part spherical bulge on the first sleeve.  
     
     
         7 . A sleeve assembly as claimed in  claim 6  wherein the first and second sleeves are joined in a snap-fit.  
     
     
         8 . A sleeve assembly as claimed in  claim 7  wherein a depression is located in the centre of each bulge for receiving a screw for pivotally mounting the first and second sleeves together.  
     
     
         9 . A sleeve assembly as claimed in  claim 1  wherein the sleeve is moulded in a plastics material.  
     
     
         10 . A ventilator including a turbine hood having a closed end, a lower portion spaced from the closed end and a series of blades extending from the ring to the closed end, gaps being defined between adjacent blades, and a sleeve assembly for a turbine roof ventilator comprising: 
 a first sleeve portion having a first open end and a second open end and defining a central axis passing through the centre of the sleeve from the first end of the sleeve to the second end; and    a second sleeve portion defining a third and a fourth open end and defining a second central axis; wherein 
 in use, the third end of the second sleeve portion is at least partly located inside the second end of the first sleeve, the first sleeve being hinged to the second sleeve portion about a pivot axis which is located at or near the intersection of the first and second central axes and which is generally perpendicular to said central axes, the outside diameter of second sleeve portion being smaller than, or an interference fit with, the inside diameter of the first sleeve portion and both sleeves being at least part spherical such that the second and first sleeve portions can be relatively freely rotated relative to each other about the pivot axis so that the relative angle between planes defined by the first end of the first sleeve axis and the fourth end of the second sleeve may be adjusted.  
   
     
     
         11 . A ventilator as claimed in  claim 10  wherein a central portion of both the first and second sleeve portions are part spherical and wherein the first end of the first sleeve and the fourth end of the second sleeve are generally annular.  
     
     
         12 . A ventilator as claimed in  claim 11  wherein the first and second sleeve portions are configured such that the relative angle defined between the planes defined by the first end of the first sleeve and the fourth end of the second sleeve may be adjusted between 0° wherein the planes are parallel, and about 32°.  
     
     
         13 . A ventilator as claimed in  claim 11  or  claim 12  wherein the first sleeve defines one or more depressions located near its second end for receiving screws for fixing the two sleeve portions together relative to one another.  
     
     
         14 . A ventilator as claimed in  claim 11  wherein markings are moulded, printed or otherwise marked on the exterior of the sleeve assembly which are indicative of the relative orientation of the sleeves assembly.  
     
     
         15 . A ventilator as claimed in  claim 11  wherein the a hinge is defined by a part spherical bulge on the second sleeve located inside a mating depression formed by a relatively larger part spherical bulge on the first sleeve.  
     
     
         16 . A ventilator as claimed in  claim 15  wherein the first and second sleeves are joined in a snap-fit.  
     
     
         17 . A ventilator as claimed in  claim 16  wherein a depression located in the centre of each bulge receives a screw for pivotally mounting the first and second sleeves together.  
     
     
         18 . A ventilator as claimed in  claim 11  wherein the sleeve is moulded in a plastics material.  
     
     
         19 . A ventilator including a turbine hood having a closed end, a lower portion spaced from the closed end and a series of blades extending from the ring to the closed end, gaps being defined between adjacent blades, and a sleeve assembly for a turbine roof ventilator comprising: 
 a first sleeve portion having a first open end and a second open end and defining a central axis passing through the centre of the sleeve from the first end of the sleeve to the second end; and    a second sleeve portion defining a third and a fourth open end and defining a second central axis; wherein 
 in use, the third end of the second sleeve portion is at least partly located inside the second end of the first sleeve, the first sleeve being pivoted to the second sleeve portion about a hinge defining a pivot axis which is located at or near the intersection of the first and second central axes and which is generally perpendicular to said central axes, the outside diameter of the second sleeve portion being smaller than, or an interference fit with, the inside diameter of the first sleeve portion and wherein a central portion of both the first and second sleeve portions are part spherical such that the second and first sleeve portions can be relatively freely rotated relative to each other about the pivot axis so that the relative angle between planes defined by the first end of the first sleeve axis and the fourth end of the second sleeve may be adjusted and wherein the first end of the first sleeve and the fourth end of the second sleeve are generally annular.  
   
     
     
         20 . A ventilator as claimed in  claim 19  wherein the a hinge is defined by a part spherical bulge on the second sleeve located inside a mating depression formed by a relatively larger part spherical bulge on the first sleeve both sleeves being moulded in a plastics material.