Vent for an electromagnetic interference shielded enclosure.

摘要

A shielding vent (10) for an electromagnetic interference shielded enclosure (20) having an electrically conducting wall shield (21) includes a mounting plate or flange (12) through which extends a vent pipe (14) with an internal septum plate or divider (16) extending axially along at least a portion of the inner length of the vent pipe. The mounting plate (12) is secured to a wall (18) of the shielded enclosures (20) over an opening in the wall and to the wall shield (21) to insure that the integrity of the shielding for the enclosure is maintained. With the mounting plate (12) so mounted on the wall of the enclosure, the vent pipe (14) extends through the opening in the wall and provides fluid communication between an internal region of the enclosure and a region external of the enclosure. The septum plate (16) has a cross section in the shape of a cross so that at least a portion of the length of the cylindrically shaped vent pipe (14) is subdivided into four parallel, axially extending equal fluid flow sections (42 - 48). These fluid flow sections are sufficiently large in cross sectional area that they provide a minimum of resistance to fluid flowing through the vent pipe (14). By using the cross-shaped septum plate (16) in the vent pipe, the vent pipe can be made significantly shorter in length than previously used vent pipes of similar diameter, yet the vent affords an adequate degree of EMI shielding. <IMAGE>