Conveyors: fluid current – Conduit
Patent
1991-05-02
1992-09-15
Focarino, Margaret A.
Conveyors: fluid current
Conduit
406 52, 406154, 241 62, 241243, B65G 5118, B02C 702
Patent
active
051471558
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for achieving uniform distribution of airborne fibres, for instance cellulose-fibres, in the outlet of a conduit intended for the transportation of airborne fibres, said device being placed in said outlet.
In the manufacture of absorption bodies, it is normal practice to suck airborne cellulose-fibres into a vacuum mould provided with an air-permeable bottom, with the aid of subpressure, in a manner such as to fill the mould and to ensure that the fibres are held therein. The absorption body formed in the mould is, at present time, subjected to further treatment, such as to compaction for instance, in order to improve its properties. It is also known to produce absorption bodies which consist of two sub-bodies of mutually different densities, so as to improve the total absorption and liquid-dispersing properties of the absorbent body.
With this in mind, it will be understood that progressively higher demands are placed on the homogenity of the absorption bodies produced, and that local variations in density, for instance due to agglomeration of the airborne fibres introduced into a mould, cannot be tolerated to the same extent as was previously the case.
Consequently, in order to produce homogenous absorption bodies it is essential that the airborne fibres supplied to a vacuum mould are distributed uniformly in the air flow carrying said fibres. Unfortunately, this is not achieved in the case of present day air-transportation conduits, in which fibre-agglomerates, reaching the size of table-tennis balls in some instances, are formed to varying degrees, depending on the lengths of the conduits concerned and the manner in which the conduits are laid and positioned, the moisture content, etc.
The object of the present invention is to solve the above-mentioned problem by mounting in the outlet of an air-transportation conduit a device which is operative to break-up any agglomerates which may form and to ensure that the airborne fibres will be uniformly distributed when exiting from the conduit.
To this end, there is provided, in accordance with the invention, a device which comprises a plurality of mutually similar and concentrically arranged circular rotors and a plurality of semi-circular stators, which are disposed between the rotors on the outlet side of the device. Because the through-flow area on the outlet side of the device is reduced drastically by the presence of the rotors and stators, the velocity of the air flow will be increased markedly during its passage through the device-outlet. This increase in velocity, together with the rotary motion of the rotors, will produce turbulence in the air flow within the device, this turbulence either being effective to disintegrate fibre-agglomerates directly or in causing the fibres of higher velocity to strike against the rotor or stator walls.
An exemplifying embodiment of the invention will now be described with reference to the accompanying drawings, of which
FIG. 1 shows a rotor forming part of the inventive device, from above;
FIG. 2 is a cross-sectional view taken on the line II--II in FIG. 1;
FIG. 3 shows a stator forming part of the inventive device from above;
FIG. 4 is a sectional view of a device constructed in accordance with the invention; and
FIG. 5 is a part view seen in a direction from the outlet side of the inventive device towards the inlet side thereof.
FIGS. 1 and 2 illustrate a circular rotor 1 which forms part of the inventive device. The mutually opposing surfaces of the rotor periphery have provided thereon turbulence-generating elements, which in the case of the illustrated and described embodiment have the form of ribs 2 which extend from the rim of the rotor in towards the centre thereof. The radial extension of the ribs is suitably equal to one-quarter of the radius. The mutually opposing surfaces of the rotor are also provided with stiffening ribs 3, which extend radially from the rotor hub 4 to a location level with the inward extremity of the turbulence-generating ribs 2.
FIG. 3 illustr
REFERENCES:
patent: 2807054 (1957-09-01), Burger
patent: 2828923 (1958-04-01), Kramer
patent: 3581706 (1971-06-01), Rasmussen
patent: 3976252 (1976-08-01), PerDue
patent: 4176427 (1979-12-01), Neuenschwander
patent: 4214713 (1980-07-01), Wright
Focarino Margaret A.
Kannofsky James M.
Molnlycke AB
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