Solid material comminution or disintegration – Apparatus – With separation or classification of material
Patent
1992-12-09
1994-07-05
Eley, Timothy V.
Solid material comminution or disintegration
Apparatus
With separation or classification of material
241 861, 241 893, 241 95, B02C 1900
Patent
active
053260384
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a beating apparatus for fibre suspensions, including a housing having at least one inlet for suspension and one outlet for beaten suspension, a rotor rotatably arranged in the housing and having a beating surface, in which opens perforations extending through the rotor, and at least one stator arranged in the housing and having a perforated stator shoe located close to the beating surface of the rotor.
BACKGROUND OF THE INVENTION
Such a beating apparatus is known from SE-B-307 504, wherein the rotor is a drum, the inlet for suspension opens into the drum, a plurality of stator shoes is arranged at the outer periphery of the drum and a space outside the drum communicates with the outlet. The drum is open towards the inlet and a stationary distributor drum is inserted in the drum to direct incoming flow of suspension towards predetermined locations of the internal periphery of the drum, viz., those locations located in the beginning, as counted in the rotational direction of the drum, of the stator shoes arranged at the outer periphery of the drum. From strength reasons, however, a drum for a beating apparatus of this kind must be provided with a relatively thick envelope wall. This, in turn, results in that the perforations of the envelope wall become so extended in the radial direction that the passage time for a fibre from entering a perforation until leaving it may be so long that the fibre leaves a perforation only after it has passed a stator shoe, i.e., between two stator shoes, which results in that the unbeaten fibres mixes outside the rotor with beaten fibres having passed through the stator shoes. This, of course, results in an insufficient beating of the suspension.
SUMMARY OF THE INVENTION
The object of the present invention is to set aside this drawback of beating apparatuses of the kind initially stated, such that only beaten suspension reaches the outlet. In achieving this the rotor can be a drum shaped as well as disk shaped rotor.
The invention is based on the idea of providing means between the inlet and the outlet adapted to prevent flow of unbeaten suspension to the outlet by leading all flow between the inlet and the outlet through the stator shoe.
Expressed in another way it may be said that said means together with the stator shoe shall divide the housing in two parts substantially liquid tightly separated from each other (except for flow through the stator shoe), of which one part shall have communication with the inlet and the other part with the outlet. Flow between the inlet and the outlet, thus, can only take place through the stator shoe.
Expressed in yet another way it can be said that the rotor as a whole and one surface of the stator shoe shall be located in one part while the other surface on the stator shoe shall be located in the other part.
Consequently, the invention is mainly caracterized in that between the inlet and the outlet is provided shield and guide means which together with the stator shoes divides the housing in two parts substantially liquid tightly separated from each other, of which one part communicates with the inlet and the other part communicates with the outlet, said rotor as a whole and one surface of the stator shoe being located in one part, while the other surface of the stator shoe is located in the other part, such that flow between the inlet and the outlet can take place only through the perforations of the stator shoe.
In case of a beating apparatus, in which the rotor is a drum, the envelope surface of which is at least partly perforated, the inlet opens in the drum, a stator shoe is arranged at the outer periphery of the drum and a space outside the drum communicates with the outlet, the object of the invention is achieved in that the flow of beaten suspension from the perforations of the stator shoe is separated from the flow of unbeaten suspension transported through the perforations of the drum in that said shield and guide means is arranged in said space between the stator shoe
REFERENCES:
patent: 2980350 (1961-04-01), Lejeune
patent: 3138336 (1964-06-01), Lejeune et al.
patent: 3615058 (1971-10-01), Nilsson
patent: 4674251 (1987-06-01), Wolff
patent: 4955549 (1990-09-01), Reinhall
Eley Timothy V.
Han Frances
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