Apparatus, components and a method for the filtering of liquid
First Claim
1. An endless filter chain or the filtering of liquid with the object of removing solid objects from the liquid and comprising strainer elements and connecting links,wherein each strainer element extends in the conveyor direction of the chain and is delimited by two mutually parallel edges designated leading edge and trailing edge, respectively, and by two lateral edges extending perpendicularly to the leading edge and the trailing edge,wherein two successively arranged strainer elements are connected by means of one or more connecting links embedded substantially completely within the width of said strainer elements,each connecting link comprising pivot means having two parallel, spaced trunnions defining two parallel, spaced pivot axes which are perpendicular to the conveyor direction of the filter chain, whereby said connecting link may link together two successively arranged strainer elements with freedom for each strainer element to pivot relative to adjacent connecting links about a respective one of said pivot axes parallel with the leading edge and the trailing edge, the leading edge and the trailing edge on each strainer element comprising cylindrical tubes so that a small clearance with approximately unchanged width is maintained between the leading edge of a strainer element and the adjacent trailing edge on the immediately preceding strainer element.
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Accused Products
Abstract
An endless filter chain for filtering a liquid, such as sewage, which flows along a drainage duct is provided. The filter chain comprises strainer elements and connecting links interconnected to allow the strainer elements to pivot about respective axes of the connecting links while maintaining a small clearance between the leading edge of each strainer element and the trailing edge of the respective adjacent preceding element while the filter chain is trained about an upper and a lower turning roller. the filter chain does not comprise conveyor chains and the strainer elements can be sized to a width where they cover practically the entire width of the drainage duct. A method and an apparatus for filtering liquid as well as a strainer element and a connecting link are provided.
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Citations
22 Claims
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1. An endless filter chain or the filtering of liquid with the object of removing solid objects from the liquid and comprising strainer elements and connecting links,
wherein each strainer element extends in the conveyor direction of the chain and is delimited by two mutually parallel edges designated leading edge and trailing edge, respectively, and by two lateral edges extending perpendicularly to the leading edge and the trailing edge, wherein two successively arranged strainer elements are connected by means of one or more connecting links embedded substantially completely within the width of said strainer elements, each connecting link comprising pivot means having two parallel, spaced trunnions defining two parallel, spaced pivot axes which are perpendicular to the conveyor direction of the filter chain, whereby said connecting link may link together two successively arranged strainer elements with freedom for each strainer element to pivot relative to adjacent connecting links about a respective one of said pivot axes parallel with the leading edge and the trailing edge, the leading edge and the trailing edge on each strainer element comprising cylindrical tubes so that a small clearance with approximately unchanged width is maintained between the leading edge of a strainer element and the adjacent trailing edge on the immediately preceding strainer element.
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20. A method of filtering a liquid which flows along a duct, comprising the steps of
selecting an endless filter chain, said chain comprising strainer elements and connecting links, each of said strainer elements extending in the conveyor direction of the chain and being delimited by two mutually parallel edges, designated leading edge and trailing edge, respectively, and by two lateral edges extending perpendicularly to the leading edge and the trailing edge, wherein two successively arranged strainer elements are connected by one or more connecting links embedded substantially completely within the width of said strainer elements, each connecting link comprising pivot means having two parallel, spaced trunnions defining two parallel, spaced pivot axes, by which adjacent strainer elements may pivot relative to adjacent connecting links about pivot axes parallel with the respective leading edge and trailing edge, the leading edge and the trailing edge on each strainer element comprising cylindrical tubes so that a small clearance with approximately unchanged width is maintained between the leading edge of the strainer element and the adjacent trailing edge on the immediately preceding strainer element, whether the filter chain is trained about turning rollers or runs straight, guiding said filter chain in a closed path, extending through a lower turning zone below the surface level of the liquid, through a substantially rectilinear ascending flight, through an upper turning zone above the surface level of the liquid and through a substantially rectilinear descending flight back to the lower turning zone, guiding said chain laterally with a narrow clearance by providing lateral profiles in the form of fixed lateral surfaces in the duct which form a substantially unbroken slide surface in each side, feeding unfiltered water to said filter chain at the front side of said ascending flight, removing filtrate from the opposite side of said flight, training said filter chain along said path to transport filtered-off material out of the water, and removing the filtered-off material to deposit it in a receptacle.
Specification