Air supply device

Abstract

The present invention relates to an air supply device for obtaining zones of clean air in premises, said air supply device ( 1 ) comprising at least one air permeable body ( 11 ) including at least one inner and at least one outer part ( 12, 13 ) of which the inner part ( 12 ) consists of or includes porous material. A fan device is provided to bring air, which is to be supplied to the premises ( 2 ), to flow through the air permeable body ( 11 ) at low air velocity. A device is provided to see to that the air (A) supplied to the premises ( 2 ) has a lower temperature than the air in said premises ( 2 ). The air permeable body ( 11 ) has, in cross section, the shape of parts of a circle or substantially a circle or primarily parts of a circle or substantially a circle. The outer part ( 13 ) has passages which are substantially rectilinear, substantially uniform in thickness and located close to each other, said passages further having a length which is at least four times greater than their width in order to generate rectilinear and uniformly distributed partial air streams.

1 . Air supply device for obtaining zones of clean air in premises, said air supply device ( 1 ) comprising at least one air permeable body ( 11 ) including at least one inner and at least one outer part ( 12 ,  13 ) of which the inner part ( 12 ) consists of or includes porous material, wherein: 
 at least one fan device ( 22 ) is provided to bring air (A), which is to be supplied to the premises ( 2 ), to flow through the air permeable body ( 11 ) at low air velocity,    at least one device ( 23 ) is provided to see to that the air (A) supplied to the premises ( 2 ) has a lower temperature than the air in said premises ( 2 ),    the air permeable body ( 11 ), in cross section, has the shape of parts of a circle or substantially a circle or primarily parts of a circle or substantially a circle, and    the combination that the inner part ( 12 ) consists of or includes porous material and the outer part ( 13 ) has passages ( 16 ) which are substantially rectilinear, substantially uniform in thickness and located close to each other, said passages ( 16 ) further having a length (L) which is at least four times greater than their width (B) in order to generate rectilinear and uniformly distributed partial air streams ( 6   a ) for making a turbulent zone ( 7   a ) around the clean-air zone ( 7 ) more narrow so that the turbulence around the clean-air zone ( 7 ) hereby becomes less.    
   
   
       2 . Air supply device according to  claim 1 , wherein the length (L) of each passage ( 16 ) is 4-10 times greater than their width (B).  
   
   
       3 . Air supply device according to  claim 2 , wherein the length (L) of each passage ( 16 ) is 4-6 times greater than their width (B).  
   
   
       4 . Air supply device according to  claim 1 , wherein: 
 the passages ( 16 ) have a circular or substantially circular cross section, and    they have the same or substantially the same diameter along their entire length (L).    
   
   
       5 . Air supply device according to  claim 1 , wherein all or almost all passages ( 16 ) are of equal length.  
   
   
       6 . Air supply device according to  claim 1 , wherein the passages ( 16 ) are defined by tubes ( 17 ) which are located close to each other and connected to each other.  
   
   
       7 . Air supply device according to  claim 6 , wherein the tubes ( 17 ) are made of a plastic material.  
   
   
       8 . Air supply device according to  claim 6 , wherein the tubes ( 17 ) are made of a metallic material.  
   
   
       9 . Air supply device according to  claim 6 , wherein the tubes ( 17 ) are made of a ceramic material.  
   
   
       10 . Air supply device according to  claim 6 , wherein the tubes ( 17 ) are interconnected by fusing.  
   
   
       11 . Air supply device according to  claim 1 , wherein the porous material ( 14 ) of the inner part ( 12 ) is designed to permit filtration of air flowing through said porous material in order to obtain a low content of particles in the premises ( 2 ).  
   
   
       12 . Air supply device according to  claim 1 , wherein the porous material ( 14 ) of the inner part ( 12 ) consists of foamed plastic with open cells.  
   
   
       13 . Air supply device according to  claim 1 , wherein the outer part ( 13 ) is thicker than the inner part ( 12 ).  
   
   
       14 . Air supply device according to  claim 1 , wherein the outer part ( 13 ) consists of a heat resistant material.  
   
   
       15 . Air supply device according to  claim 1 , wherein the inner and outer parts ( 12 ,  13 ) are connected to each other.  
   
   
       16 . Air supply device according to  claim 1 , wherein the body ( 11 ) is in cross section shaped as a semicircle or substantially as a semicircle.  
   
   
       17 . Air supply device according to  claim 1 , wherein the air permeable body ( 11 ) is in cross section shaped as a quarter of a circle or substantially as a quarter of a circle.  
   
   
       18 . Air supply device according to  claim 1 , wherein the air permeable body ( 11 ) is shaped as a spherical segment or as a substantially spherical segment.  
   
   
       19 . Air supply device according to  claim 1 , wherein the device ( 23 ) which is provided to see to that the air (A) supplied to the premises ( 2 ) has a lower temperature than the air in said premises ( 2 ), is provided to supply air at such temperature that said air descends to a low level in the premises ( 2 ).  
   
   
       20 . Air supply device according to  claim 1 , wherein: 
 impure air is gathered in an upper zone ( 18 ) closest to the ceiling ( 9 ) of the premises ( 2 ),    at least one air outlet ( 19 ) for impure air is provided at the ceiling ( 9 ) of the premises ( 2 ), and    the air permeable body ( 11 ) is located beneath the upper zone ( 18 ) such that substantially no impure air is coejected out of the upper zone ( 18 ) by the air streams ( 6 ) discharged by the air permeable body ( 11 ).    
   
   
       21 . Air supply device according to  claim 1 , wherein the air permeable body ( 11 ) is located above a door ( 20 ) to the premises ( 2 ) and it is elongated and extends along at least a part of the width of the door ( 20 ).  
   
   
       22 . Air supply device according to  claim 1 , wherein the device ( 23 ) which is provided to see to that the air (A) supplied to the premises ( 2 ) has a lower temperature than the air in said premises ( 2 ), is a device for taking in cool air and/or includes a cooling device or is a cooling device for cooling air.