초록 ▼

A compact double screen assembly (20), which can be used alone or mounted on a perforated pipe base (22), has a plurality of rods (30) arranged in cylindrical fashion around an axis (23). A wire (34) is helically wound about the rods (30) and welded thereto at every intersection. Adjacent rods (30)

A compact double screen assembly (20), which can be used alone or mounted on a perforated pipe base (22), has a plurality of rods (30) arranged in cylindrical fashion around an axis (23). A wire (34) is helically wound about the rods (30) and welded thereto at every intersection. Adjacent rods (30) are separated by an inter-rod gap having a slot distance X while adjacent turns of the wire have an inter-turn slot distance Y therebetween. The rods (30) are closely spaced together such that the inter-rod slot distance X is on the order of 80-120% of the inter-turn slot distance Y, and preferably equal to it. A packing cavity (42) is provided between the rods (30) and the wire (34) for accommodating a porous media or packing material (40). Specially tapered or concave sidewall surfaces on the rods (30) according to the present invention enhance the size of the packing cavity (42) and, when the assembly is mounted on a perforated pipe base 22, permit flow to take place beneath the rods through perforations (24) in the pipe base (22). Rods (30', 30", 30'", 30"") according to the present invention have a center of mass which is closer to a pipe base-contacting end (52) of the rod than to a wire-contacting apex (52) of the rod.

대표청구항 ▼

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] A generally cylindrical double screen assembly comprising a plurality of parallel rods extending essentially parallel to and spaced from the central axis of the screen assembly, an

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] A generally cylindrical double screen assembly comprising a plurality of parallel rods extending essentially parallel to and spaced from the central axis of the screen assembly, and adjacent ones of said parallel rods being separated by an inter-rod spacing distance or rod slot opening dimension X, the rods having a wire helically wound thereabout and welded thereto so that adjacent wire segments have an inter-wire segment or wire slot opening dimension Y, wherein the improvement comprises X being between 80-120% of Y and wherein a porous media is located in the internal cavity formed between the wire and the sidewall portions of the rods which are located above the point at which adjacent rods are closest to each other.