Vortex pulp distributor

Abstract

The invention provides a cyclone headbox, comprising a barrel body, a barrel cover, a pulp inlet, a plurality of pulp outlets and an overflow mouth arranged on the barrel cover. The invention is characterized in that: the barrel body comprises an internal barrel and an external barrel that are coaxial, and the barrel cover is fixed on the top end of the internal barrel; the pulp outlets are equally distributed on the upper end of the internal barrel, the external barrel is sleeved and fixed near the lower end of the middle part of the internal barrel, and an interlayer is formed between the external barrel and the internal barrel; the upper edge of the external barrel is a downward helical line, the end of which is equal or a little higher than the lower end of the internal barrel, the interlayer between the external barrel and the internal barrel is sealed into a helical surface along the helical line from a cover board; a generating line of the helical surface is vertical to an axial line of the internal barrel, and a longitudinal bore of the pulp inlet is a thread pitch of a helix; the pulp inlet is close to the tangential direction of the highest end of the helical surface and communicated with the interlayer, the bottom part of the external barrel is provided with a heavy impurity outlet, and an additional surface polished central barrel with both ends sealed is designed, while the central barrel and the internal barrel are coaxially and vertically fixed in the internal barrel. The invention has the advantage of equal pulping, eliminating the pulp pulse, no slim pulp, and good light and heavy impurities removing effect.

Description

technical field [0001] The invention relates to a swirling pulp distributor, which belongs to the technical field of papermaking machinery. Background technique [0002] All headboxes consist of three parts: a slurry distributor, a homogenizing zone and a weir plate. The slurry distributor is used to pass the slurry from the pipeline through the homogenizing zone uniformly along the width of the network, at equal pressure and at a constant speed. And weir plate, and finally transformed into a thick and uniform pulp flow covering the entire width of the paper machine, to obtain paper sheets with excellent uniformity and uniform weight. At present, there are also technical introductions about the slurry distributor in the patent documents published by the State Intellectual Property Office, such as the "equal pressure slurry distributor" with the patent number "200420043504", which is mainly composed of an inlet flange, a damping element, a cylinder, and an outlet joint. , cy...

AI Technical Summary

Problems solved by technology

The defect is: the square cone header is designed and manufactured according to the calculation results of the fluid motion equation, and the slurry shrinkage loss coefficient caused by the square cone header shrinkage and the friction coefficient of the square cone header are related to the slurry flow rate, turbulent flow intensity, and slurry viscosity. The viscosity of the slurry is related to the concentration of the slurry, the temperature, the amount of chemicals and fillers, the type of fiber, and the degree of beating. These coefficients are measured in a specific experimental device, specific slurry, and temperature. The pulp distributor is difficult to adapt to industrialized large-scale production and changing market demand and production conditions

Although the present invention has a certain reduction effect on the slurry pulse, it has no good solution to the slurry pressure and flow change, and its performance needs to be further improved

In addition, the common defects of existing slurry distributors are: poor adaptability to slurry pulses, well-purified slurry must be used, and heavy and light slag removers are required, which requires a lot of equipment investment, long process, high power consumption, and land occupation. large area

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