Air supply device
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.