| 主权项 |
1. A welding chamber, comprising:
a housing defining an interior space; an apparatus for purging atmospheric air from the interior space with a gas, the apparatus comprising a perforated plate system configured for generating a substantially low-turbulent, laminar flow front of gas into the interior space with low turbulence to displace the atmospheric air in the interior space, wherein the flow front of the gas creates a purge flow front that minimizes mixing of the gas with the atmospheric air within the interior space, and an exhaust outlet in communication with the interior space to permit the displaced atmospheric air to exit the interior space, wherein the perforated plate system comprises: a perforated plate positioned within the chamber and defining a bottom of the interior space, the perforated plate having a plurality of spaced-apart holes formed therethrough, a purge support plate positioned in a spaced relation beneath the perforated plate, said purge support plate having a plurality of spaced-apart diffusers affixed thereto, and a manifold means communicating with the diffusers and adapted to supply the gas to the diffusers, whereby the gas is emitted to the diffusers to enter the space between the purge support plate and the perforated plate to pass through the holes in the perforated plate creating a low turbulent, laminar flow front of gas extending across the bottom of the interior space and flowing upward from the bottom of the interior space toward a ceiling of the housing to displace the atmospheric air in the interior space. |
