Single cartridge filter housing
AssigneeInFlos Designs
InventorRobert G. Garber
Life of this patent
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Abstract
A single cartridge filter housing assembly for the filtration of etching liquids, deionized water, slurries and other liquids used in the semiconductor, pharmaceutical and chemical industries. It comprises a bottom housing and a top housing with an O-ring in between and a nut ring engaging top and bottom housings in order to compress the O-ring thus forming a sealed cavity for the cartridge. The bottom housing holds the nose of the cartridge in a concentric recess and holds the cartridge top centered by several radial protrusions in its mouth. An inlet and an outlet at the bottom of the bottom housing for the liquid to be filtered are coaxial for easy plumbing connections. The top housing carries a vent tube to use the air within to stabilize the liquid level in spite of pressure variations because of pump action.
Claims10
A housing assembly (10) for the filtration of a liquid, for holding a commercial replaceable filter cartridge (80) with a closed top and an open end bottom nose (85) carrying two O-rings (86,88), the housing assembly comprising:
- a) a cup-shaped bottom housing (100), with a flat bottom outer surface (102) and with a cylindrical outer surface having at its top a smaller diameter lip (160) with an outside thread (162) surrounding a smaller diameter cylindrical first recess (166) with a downwardly extending first groove (168) for holding an O-ring (170), the recess having a concentric upward opening (180) of a cavity (140) for holding the cartridge (80), the cavity (140) at its lower end having a smaller diameter cylindrical second recess (144) for sealingly receiving the O-rings (86,88) of the nose of cartridge (80), the cavity (140) also having an axial duct through the second recess (144) for connecting perpendicularly to a radial inlet (120) and the second recess (144) having a concentric duct (148) leading perpendicularly to a radial outlet (130);
- b) a cap-shaped cylindrical top housing (200) having a downwardly open cavity (250) and having a larger diameter radial flange (210) with an upper annular surface (214) and a lower annular surface (216) and having an cylindrical lower axial flange (220) with a lip (222) having a second groove (232) for engaging the first recess (166) of the bottom housing (100) with the O-ring (168) in the first groove (170), the axial flange (220) having a larger diameter recess (224) and a smaller diameter deeper recess (228), the top housing (200) also carrying an outside thread (206) between its top and the radial flange (210);
- c) a cylindrical nut ring (300) having an axial cylindrical flange with an inside first thread (306), for engaging the outside thread (162) of the bottom housing, and a smaller diameter top opening (303), creating an inside annular surface (308), with an inside second thread (304) for engaging the outside thread ((206) on the top housing (200), for the annular surface (308) engaging the upper annular surface (214) of the radial flange (210) of the top housing (200);
- wherein
- the bottom housing and the top housing via the common interface form a closed sealed cavity around the cartridge (80), such that the liquid to be filtered enters the inlet (120) in the bottom housing (100), flows radially through the cylindrical portion (82) of the cartridge (80) and through its nose (85) to the outlet (130) of the bottom housing (100).
Dependencies are inferred from the claim text.