| 主权项 |
1. An air cleaning system, comprising:
a fire protection system that comprises a spark arrestor for preventing sparks from entering the air cleaning system beyond the spark arrestor, said spark arrestor comprising a particle pre-separator located to remove particles from a flow of a gas mixture, said particle pre-separator comprising:
a. a housing comprising a gas inlet opening and a gas outlet opening;b. a core having a first end facing the gas inlet opening and a second end opposite to the first end, wherein the core is of a substantially conical shape, having a gradually increasing diameter in the direction from the first end to the second end; andc. a plurality of vanes attached to the core along helical line segments, wherein the housing has a first conical housing portion enclosing the core, and a second cylindrical housing portion between the first housing portion and the outlet opening, said first housing portion having a substantially conical shape with a gradually increasing diameter in the direction from the gas inlet opening to the second housing portion, said second housing portion being provided with an opening, different from said gas outlet opening, for removal of pre-separated particles, and wherein the core, the housing and each pair of neighboring vanes define a path for passage of the gas mixture such that no particulate entrained by the gas is permitted to travel in a straight line from a plane through the first end of the core to a plane through the second end of the core. |
