| 摘要 |
A filtration barrier includes a filter mesh that has a plurality of groups of flexible filter elements, with each group having at least a first and second flexible filter elements disposed in spaced relation. The first flexible filter element is more flexible than the second. Each flexible filter element is secured to the first and second anchoring members of the mesh and free therebetween. During forward fluid flow, the first and second flexible filter elements are supported against downstream deflection and lie in a common plane. For reverse fluid flow, the first flexible element of a group displaces farther from the common plane than the second flexible filter element of that group, such that a first backwash opening associated with the first flexible element is larger than a second backwash opening associated with the second flexible element. Each group may have more elements, and associated methods are also disclosed. |
| 主权项 |
1. A filtration barrier, comprising:
a filter mesh comprising:
a plurality of groups of flexible filter elements; each group comprising a first flexible filter element and a second flexible filter element disposed in spaced relation to the first flexible filter element;first and second anchoring members spaced from each other, wherein each first and second flexible filter element of each of the plurality of groups is secured to both the first and second anchoring members and free therebetween;wherein, within each group, the first flexible filter element is more flexible than the second flexible filter element; a plurality of support members disposed downstream of the filter mesh for forward fluid flow through the filter mesh; wherein the first and second flexible filter elements are disposed so as to rest against one or more of the support members during forward fluid flow through the filter mesh such that the first and second flexible filter elements are supported against downstream deflection and lie in a common plane, the common plane being transverse to a direction of forward fluid flow through the filter mesh; wherein, for each group, the first and second flexible filter elements are configured such that, in response to reverse fluid flow, opposite the direction of forward fluid flow, the first flexible element of that group displaces farther from the common plane than the second flexible filter element of that group displaces from the common plane, such that a first backwash opening associated with the first flexible element is larger than a second backwash opening associated with the second flexible element. |
