Patent ID: 7867312
Filing Date: 2011-01-11
Classification: C23C,Y10S

Abstract:
1. A trap device for removing species from a gas stream drawn from an enclosure by a vacuum pump, the device comprising: a casing having an inlet for receiving the gas stream, an outlet for exhausting the gas stream from the casing, and first and second chambers each for receiving the gas stream from the inlet and conveying the gas stream to the outlet; means for selectively diverting the gas stream from the inlet to a selected one of the chambers; a first plurality of cartridges each being removably insertable into the casing to provide a plurality of flow passages for gas passing through the first chamber; and a second plurality of cartridges each being removably insertable into the casing to provide a plurality of flow passages for gas passing through the second chamber, each flow passage extending between an inlet and an outlet of a respective cartridge, each cartridge housing a removal means to remove species from the gas passing therethrough as solid material collecting within the cartridge, wherein each chamber comprises baffle means for directing gas entering that chamber into the inlets of the cartridges located therein, wherein the inlet and the outlet of each cartridge are positioned such that, when the cartridge is fully inserted into the chamber, the inlet and the outlet of the cartridge are located on opposite sides of the baffle means, wherein within the chamber the baffle means separates a first plenum chamber, which is in fluid communication with the inlet of the casing and the inlets of the cartridges, from a second plenum chamber which is in fluid communication with the outlets of the cartridges and the outlet of the casing.