摘要:
The invention relates to a headbox (1) for a machine for producing a fibrous web (2) from at least one fibrous suspension (3), comprising a distribution device (4) for feeding the at least one fibrous suspension, downstream turbulence generating means (5) having an inlet side and also an outlet side and also a plurality of flow channels (6) arranged in lines and in columns on the outlet side, and a headbox nozzle (7) which is directly contiguous to the turbulence generator and which has a nozzle gap (8). Said flow channels (6) of the turbulence generator (5) are arranged in at least two lines on the outlet side and the flow channels (6) of one line of the turbulence generator (5) arranged on the outlet side on a horizontal plane are arranged on the inlet side in at least two different horizontal planes and the flow channels (6) of one line of the turbulence generating means arranged on the outlet side on a horizontal plane have a distribution of
摘要:
The invention relates to a headbox (1) for a machine for producing a fibrous material web (3), in particular a paper, cardboard or tissue web (3), from at least one fibrous material suspension (2), comprising a feeding device (4, 5) feeding the at least one fibrous material suspension (2), a perforated distribution pipe plate (6), which is arranged immediately downstream of the feeding device (4, 5) in the flow direction (R) of the at least one fibrous material suspension (2) and which comprises a plurality of flow channels (7) arranged in rows (Z; Z.1 to Z.3) and columns (S; S.1 to S.4), an intermediate channel (8), which is arranged immediately downstream of the perforated distribution pipe plate (6) in the flow direction (R) of the at least one fibrous material suspension (2) and which extends in the width direction (B) of the headbox (1) and comprises two walls (9.1, 9.2) preferably having the width of the machine, a turbulence generating means (10), which is arranged immediately downstream of the intermediate channel (8) in the flow direction (R) of the at least one fibrous material suspension (2) and which has a plurality of flow channels (11) arranged in rows (Z; Z.1 to Z.3) and in columns (S; S.1 to S.4), and a headbox nozzle (13), which is arranged immediately downstream of the turbulence generating means (10) in the flow direction (R) of the at least one fibrous material suspension (2) and which has a nozzle gap (14), wherein the feeding device (4, 5), the perforated distribution pipe plate (6) and the intermediate channel (8) are arranged in a first alignment plane (AE.1), and the turbulence generating means (10) and the headbox nozzle (13) are arranged in a second alignment plane (AE.2), and wherein the two alignment planes (AE.1, AE.2) form an angle (α) in the range of >90 and
摘要:
The invention relates to a headbox for a machine for producing a fibrous web from a fibrous suspension, having a feed device (4, 5) which feeds the fibrous suspension, having a distributor pipe perforated plate (6) which directly adjoins the feed device in the flow direction of the fibrous suspension, having an intermediate duct (8) which directly adjoins the distributor pipe perforated plate in the flow direction and which has two walls (9.1, 9.2), having a turbulence generating means (10) which directly adjoins the intermediate duct in the flow direction, and having a headbox nozzle (13) which directly adjoins the turbulence generating means in the flow direction, wherein the feed device, the distributor pipe perforated plate and the intermediate duct are arranged in a first plane of alignment (AE.1) and the turbulence generating means and the headbox nozzle are arranged in a second plane of alignment (AE.2), and wherein the two planes of alignment enclose an angle (α) in the range > 90° and
摘要:
The invention relates to a valve (1) for regulating a fluid flow (2), in particular a fibrous material suspension flow (2.1) preferably guided in a machine (200) for producing a fibrous material web, in particular a web of paper, cardboard or packaging paper. The valve comprises a hollow body (3) having a substantially, at least in sections, rotationally symmetrical cavity (4) with a longitudinal axis (4.L). Said cavity has at least one inlet opening (5) having a longitudinal axis (5.L) and an inlet channel (5.1), a variable and substantially rotationally symmetrical passage area (6) and an outlet opening (7) with an outlet channel (7.1). The valve also comprises a valve stem (8), which is preferably rotationally symmetrical, has in particular a valve disc (9), can be coaxially displaced in the cavity (4) of the hollow body (3), preferably by means of at least one actuating means (10), and is capable of varying the passage area (6) as a consequence of a displacement (V). The valve (1) according to the invention is characterised in that the valve stem (8) is guided in the axial direction (R) by means of at least two at least radially acting bearing units (11.1, 11.2) having a degree of freedom required for the displacement (V).
摘要:
The invention relates to a valve (1) for regulating a fluid flow (2), in particular a fibrous material suspension flow (2.1) preferably guided in a machine for producing a fibrous material web, in particular a paper, cardboard or packaging paper web, said valve comprising a hollow body (3) having a cavity (4) which at least in some sections is substantially rotationally symmetrical and has a longitudinal axis (L.4). Said cavity includes at least one inlet opening (5) having a longitudinal axis (L.5), a rotationally symmetrical confuser (6) and a cylindrical or approximately cylindrical constriction (7). The valve further comprises a preferably rotationally symmetrical valve rod (8) which can be moved coaxially in the cavity (4) of the hollow body (3) preferably by means of at least one actuating means (10), can vary the open confuser surface (A.6) as a result of a displacement (V), and in particular comprises a valve disc (9) with a valve disc diameter (D.9). The valve (1) according to the invention is characterised in that the cylindrical or approximately cylindrical constriction (7) in the cavity (4) of the hollow body (3) is dimensioned such that at least in an operating position (B), preferably in a closed operating position (BG) of the valve (1), a minimum volume flow (V min ) can be generated between the movable valve rod (8) and the cylindrical or approximately cylindrical constriction (7) when an open minimum annular surface (A min ) can be generated, which has a value of ≥ 0.1%, preferably ≥ 1%, in particular ≥ 4% of the maximum volume flow (V max ) of the valve (1).