Air diffuser for high velocity hvac systems

Abstract

The air diffuser which is designed to be attached to an air supply duct comprises a cannister having a closed and an air inlet pipe proximate its closed end for attachment to the air supply duct. The cannister also includes attachment means proximate its open end so that the cannister can be secured to a supporting frame. A hollow sleeve having an open bottom end is slidingly insertable into the open end of the cannister, and at its top end is provided with a first array of air discharge ports. Co-operating means are located on an interior sidewall of the cannister and an exterior sidewall of the sleeve which permits the sleeve and the cannister to be telescoped together in a non-rotational relationship and which also enables the sleeve to be detachably connected to the cannister at selected telescopic positions. An air diffuser cap provided with a second array of air discharge ports overlies the top end of the sleeve and its associated first array of air discharge ports and is rotationally movable relative thereto to thereby control the passage of air through the discharge ports of both arrays.

1 . An air diffuser for attachment to an air supply duct, said diffuser comprising:
 (a) a cannister having a closed end and an open end, an air inlet pipe connected to an exterior sidewall of said cannister proximate said closed end for attachment to said air supply duct and which is in air communication with an interior of said cannister, and attachment means proximate said open end for securing said cannister to a supporting frame;   (b) a hollow sleeve having an open bottom end slidingly insertable into said open end of said cannister and a top end provided with a first array of air discharge ports;   (c) co-operating means on an interior sidewall of said cannister and an exterior sidewall of said sleeve permitting said sleeve and said cannister to be telescoped together in a non-rotational relationship and enabling the sleeve to be detachably connected to said cannister at selected telescopic positions;   (d) an air diffuser cap overlying and connected to said top end of said sleeve and having a second array of air discharge ports, said cap being rotationally movable relative to said sleeve between a first open position where the discharge ports of the first and second array are aligned for the passage of air therethrough and a second closed position where the air discharge passages of said first and second arrays are not aligned and the passage of air therethrough is blocked; and   (e) one of said sleeve proximate its top end and said air diffuser cap including abutment means projecting radially outwardly therefrom for engaging a facing disposed between said abutment means and said mounting framework to thereby limit the extent said sleeve can be telescopically inserted into said cannister.   
     
     
         2 . The air diffuser as claimed in  claim 1  wherein said cannister and said sleeve are cylindrical in shape and wherein said co-operating means permitting said sleeve and said connector to be telescoped together in a non-rotational relationship includes an elongate guide rail on one of said exterior sidewall of said sleeve and interior sidewall of said cannister which is in sliding engagement with an elongate guide groove on the other of said exterior sidewall of said sleeve and interior sidewall of said cannister. 
     
     
         3 . The air diffuser as claimed in  claim 1  wherein said cannister and said sleeve are cylindrical in shape and wherein said co-operating means enabling the sleeve to be detachably connected to said cannister at selected telescopic positions includes a row of spaced apart recesses in one of said exterior sidewall of said sleeve and said interior sidewall of said cannister and a complimentary row of spaced apart projections on the other of said exterior sidewall of said sleeve and said interior sidewall of said cannister whereby a fixed number of recesses detachably engage a corresponding number of projections when said cannister and said sleeve are at one of said selected telescopic positions. 
     
     
         4 . The air diffuser as claimed in  claim 2  wherein said co-operating means enabling the sleeve to be detachably connected to said cannister at selected telescopic positions includes a row of spaced apart recesses in one of said exterior sidewall of said sleeve and said interior sidewall of said cannister and a complimentary row of spaced apart projections on the other of said exterior sidewall of said sleeve and said interior sidewall of said cannister whereby a fixed number of recesses detachably engage a corresponding number of projections when said cannister and said sleeve are at one of said selected telescopic positions. 
     
     
         5 . The air diffuser as claimed in  claim 2  wherein said guide rail is on said exterior sidewall of said sleeve. 
     
     
         6 . The air diffuser as claimed in  claim 3  wherein said row of spaced apart recesses is in the exterior side wall of said sleeve. 
     
     
         7 . The air diffuser as claimed in  claim 4  wherein said guide rail and said row of spaced apart recesses are located on said exterior sidewall of said sleeve. 
     
     
         8 . The air diffuser as claimed in  claim 4  wherein said diffuser cap includes an annular skirt which is rotationally connected to said exterior sidewall of said sleeve proximate said top end. 
     
     
         9 . The air diffuser as claimed in  claim 8  wherein said abutment means comprises an annular flange surrounding said diffuser cap. 
     
     
         10 . The air diffuser as claimed in  claim 4  wherein said first and second arrays of discharge ports are identical in configuration. 
     
     
         11 . The air diffuser as claimed in  claim 4  wherein said hollow sleeve at its said bottom end adjacent said air inlet pipe includes an opening which permits the passage of air from said air inlet pipe into the interior of said cannister when said sleeve is fully inserted into said cannister.