Cooling arrangement

Abstract

A cooling arrangement for cooling a heat generating electrical component is disclosed, which arrangement comprises a heat spreading element ( 2 ) having a mounting surface ( 3 ) adapted to be thermally connected to the heat generating electrical component ( 1 ), and a heat rejection surface ( 4 ). The arrangement further comprises an enclosure ( 5 ) arranged to cover the heat rejection surface ( 4 ) and form an essentially closed compartment; an opening ( 13 ) leading into the compartment; an annular member ( 11 ) coaxially aligned with the opening; and an actuator connected to the annular member ( 11 ), and arranged to move the annular member ( 11 ) reciprocating away from/toward the opening ( 13 ). The annular member ( 11 ) hence generates a jet directed through the opening ( 13 ) toward the outside of the enclosure ( 5 ).

1 . A cooling arrangement for cooling a heat-generating electrical component, comprising:
 a heat-spreading element having
 a mounting surface adapted to be thermally connected to said heat: generating electrical component, and 
 a heat rejection surface; 
   an enclosure defining an opening and configured to cover said heat rejection surface and form a substantially closed compartment;   an annular member coaxially aligned with said opening; and   an actuator connected to said annular member, and arranged to move said annular member reciprocating away from/toward said opening, so that said annular member generates a jet directed through the opening toward the outside of said enclosure.   
     
     
         2 . (canceled) 
     
     
         3 . The cooling arrangement according to  claim 1  wherein said enclosure comprises at least one additional opening for generating flows inside said enclosure. 
     
     
         4 . The cooling arrangement according to  claim 1  wherein said actuator is integrated in said enclosure. 
     
     
         5 . (canceled) 
     
     
         6 . The cooling arrangement according to  claim 16  wherein said actuator is a loudspeaker, which loudspeaker comprises a magnet, a coil and a membrane, wherein said annular member is connected to the coil of said loudspeaker, and said coil is suspended and guided by said membrane. 
     
     
         7 . The cooling arrangement according to  claim 6 , wherein said opening is formed in said magnet. 
     
     
         8 . The cooling arrangement according to  claim 1 , further comprising a tubular member extending through said opening, said tubular member having a first open end arranged inside said enclosure connected to said annular member, and a second open end arranged outside said enclosure, said annular member forming a flange on said tubular member. 
     
     
         9 . The cooling arrangement according to  claim 6  wherein said coil and said membrane are arranged inside said compartment, whereby said membrane divides the inside of the enclosure into a first and a second sub compartment, each sub compartment being provided with at least one opening, and wherein at least one of said openings leading from said first sub compartment is connected to at least one of said openings leading from said second sub compartment. 
     
     
         10 . The cooling arrangement according to  claim 9 , wherein at least one of said openings leading from said first sub compartment is connected to at least one of said openings leading from said second sub compartment via a λ-pipe, where λ is the wave length generated by the actuator. 
     
     
         11 . The cooling arrangement according to  claim 1 , to wherein the resonance frequency of said annular member is subsonic. 
     
     
         12 . The cooling arrangement according to  claim 1 , wherein the distance between said annular member and an opposing surface is adapted to allow a jet to develop toward the inside of the enclosure. 
     
     
         13 . The cooling arrangement according to  claim 1 , wherein the distance between said annular member and the opposing surface is at least 2 times the opening diameter of said annular member and preferably at maximum 10 times the opening diameter. 
     
     
         14 . (canceled) 
     
     
         15 . An illumination device comprising at least one light-emitting element attached to a cooling arrangement according to  claim 1 . 
     
     
         16 . A cooling arrangement for cooling a heat-generating electrical component, comprising:
 a heat-spreading element having
 a mounting surface adapted to be thermally connected to said heat-generating electrical component, and 
 a heat rejection surface; 
   an enclosure configured to cover said heat rejection surface and a substantially closed compartment;   an actuator defining an opening, and   an annular member coaxially aligned with said opening and connected to said actuator, wherein the actuator is arranged to move said annular member reciprocating away from/toward said opening, so that said annular member generates a jet directed through the opening toward the outside of said enclosure.   
     
     
         17 . The cooling arrangement according to  claim 16 , further comprising a tubular member extending through said opening, said tubular member having a first open end arranged inside said enclosure connected to said annular member, and a second open end arranged outside said enclosure, said annular member forming a flange on said tubular member.