design perälaatikon moniporrasturbulenssigeneraattori and method turbulenssigeneraattorin moniportaisen putkirakenteen to form

摘要

The invention relates to a multistage turbulence generator 10 in the head box of a paper machine and a method for forming a pipe construction with a plurality of sections in a turbulence generator. The multistage turbulence generator 10 comprises a front plate 11, a rear plate 12 and lateral sides 13 14 between these, which join the front plates and the rear plates. The turbulence generator comprises a multistage pipe system 15, which comprises a plurality of section pipes 16a, 16b, 16c ..., by way of which the pulp flow is designed to enter the head box. Each section pipe 16, 16b, 16c ... comprises plastic sleeves 20a, 20b with a central flow duct 25, 26; 27;28, the plastic sleeves being joined by at least one tubular part 21a, 21b ... on the outer circumference of the plastic sleeves. IMAGE