filter device

Abstract

The present invention can prevent the occurrence of short-circuit flow that reduces the filtering function, and provides a filtering device excellent in the filtering function. A filter chamber located between the perforated plate constituting the filter member support plate and the perforated plate on the upstream side facing the perforated plate in the water flow direction of the raw water is filled with an appropriate amount of fiber filter members, one end of which is fixed to the On the porous plate, the other end of the fiber filter member is fixed on the upstream porous plate. In addition, the fiber filter member includes: a cord-shaped core material whose length is longer than the length of the filter chamber in the flow direction of the raw water by a predetermined amount; an innumerable number of resin fibers subjected to a bulking process, and which are obtained from the core material. The outer peripheral side protrudes radially and forms an infinite number of rings. The core material is provided with a predetermined length of a portion in which the resin fiber is not provided, and only the core material is present.

Description

technical field [0001] The present invention relates to filtration devices for capturing impurities from water, waste water, other raw water. Background technique [0002] With regard to the structure in which the filter chamber is filled with a long fiber filter member in the flow direction of raw water to form a filter device, there is a filter member whose lower end is fixed to a perforated plate constituting the filter chamber and a filter member is arranged above the filter member. There is a structure in which the filter member is floating (for example, Patent Document 1), and a structure in which the upper and lower ends of the filter member are fixed to a filter chamber constituting member such as a perforated plate (for example, Patent Document 2). [0003] Patent Document 1: JP Unexamined Publication No. 2003-265907; [0004] Patent Document 2: JP Unexamined Patent Publication No. 2002-45612. [0005] In the above-mentioned existing examples, in the former struct...

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Problems solved by technology

[0005] In the above-mentioned existing examples, in the former structure, the large impurities are captured by the floating filter member, and the small impurities are captured by the fiber filter member to improve the filtration efficiency. structure, so not only is it difficult to make the compacted state formed by the flow of raw water uniform, but also sometimes voids are created through which raw water flows as a short circuit flow, thereby impairing the filtration function

[0006] In addition, in the latter structure, since the upper and lower ends of the fiber filter member are fixed, the positional relationship of each filter member formed by the flow of raw water is relatively stable, and it becomes a uniformly compacted state. When changing to high speed or due to the change in the filling method of the filter elements in the filter chamber, sometimes gaps are created between the filter elements or at the boundary between the filter elements and the side walls of the filter chamber

In addition, in the latter structure, since the impurity trapping member protrudes from the outer peripheral side of the core material to form a fiber filter member, the part of the trapping member that is away from the periphery of the core portion is empty than the periphery of the core portion, and the raw water passes through. The above-mentioned gaps and empty parts flow and short-circuit, reducing the filtering function

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