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US 6,730,193 B1Granted
Wire pit
AssigneeAndritz Inc.
InventorsJouni Matula, Riitta Rahkonen
Life of this patent
Estimating the term…
Abstract
The present invention relates to a wire pit. A characteristic feature of the wire pit (50) according to the invention is that its wall/walls (52′, 52″, 54′, 62) converge downwards so that the average flow direction of the liquid along the most part of the wire pit's (50) height deviates from vertical.
Claims18
Wire pit for an approach system of a web formation machine comprising:
- a chute located in an upper portion of the wire pit for receiving white water, wherein said chute forms a lower surface of the upper portion of the wire pit,
- an overflow portion adjacent said chute for stabilizing a surface level of the white water in the wire pit,
- a gas separator for separating gas from the white water, and
- a lower portion downstream of the upper portion and said lower portion having an outlet connectable to a mixing pump, wherein at least one wall of the wire pit converges downwardly to provide flow direction of the liquid through the wire pit which deviates from vertical.
1 more element
A wire pit for an approach system of a web formation machine comprising:
- a chute located in an upper portion of the wire pit for receiving white water,
- an overflow portion adjacent said chute for stabilizing a surface level of the white water in the wire pit,
- a gas separator for separating gas from the white waters, and
- a lower portion downstream of the upper portion and said lower portion having an outlet connectable to a mixing pump, wherein at least one wall of the wire pit converges downwardly to provide flow direction of the liquid through the wire pit which deviates from vertical, and
- wherein the wire pit has a flow path cross-section converging in a flow direction, and the lower portion is adjustable to a plurality of angular positions in relation to said upper portion.
2 more elements
A wire pit, for an approach system of a web formation machine comprising:
- a chute located in an upper portion of the wire pit for receiving white water,
- an overflow portion adjacent said chute for stabilizing a surface level of the white water in the wire pit,
- a gas separator for separating gas from the white water, and
- a lower portion downstream of the upper portion and said lower portion having an outlet connectable to a mixing pump, wherein at least one wall of the wire pit converges downwardly to provide flow direction of the liquid through the wire pit which deviates from vertical
- wherein said chute forms a bottom of the upper portion of the wire pit
- wherein a wall of the wire pit extends from chute in a flow direction, and said wall descends at an angle in a range of 20 degrees to 45 degrees from horizontal, and
- wherein downstream of said wall the wire pit further comprises a middle portion between said upper portion and lower portion, and a wall of said middle portion descends at an angle of 35 degrees to 55 degrees from horizontal.
4 more elements
A wire pit for an approach system of a web formation machine comprising:
- a chute located in an upper portion of the wire pit for receiving white water,
- an overflow portion adjacent said chute for stabilizing a surface level of the white water in the wire pit,
- a gas separator for separating gas from the white water, and
- a lower portion downstream of the upper portion and said lower portion having an outlet connectable to a mixing pump, wherein at least one wall of the wire pit converges downwardly to provide flow direction of the liquid through the wire pit which deviates from vertical,
- wherein said chute is divided into to at least two flow paths for white water streams having different fiber contents, and
- wherein at least 50% of the overflow portion is in a zone containing a pulp fraction flow with a lower fiber content.
3 more elements
A wire pit for an approach system of a web formation machine comprising:
- a chute located in an upper portion of the wire pit for receiving white water,
- an overflow portion adjacent said chute for stabilizing a surface level of the white water in the wire pit,
- a gas separator for separating gas from the white waters and said gas separator is at the upper portion of the wire pit, and
- a lower portion downstream of the upper portion and said lower portion having an outlet connectable to a mixing pump, wherein at least one wall of the wire pit converges downwardly to provide flow direction of the liquid through the wire pit which deviates from vertical,
- wherein the overflow portion has an overflow edge, and a height of the overflow edge, measured from a center line of the outlet opening of the lower portion of the wire pit, is in a range of two to five times a diameter of the outlet opening.
2 more elements
Dependencies are inferred from the claim text.