DE7909674U1 - SPIN DRUM WITH VERTICAL ROTARY AXIS FOR CONCENTRATION OF SUSPENSIONS - Google Patents

Description

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Centrifugal drum with vertical axis of rotation for the concentration of suspensions

The innovation relates to a centrifugal drum with a vertical Axis of rotation for the concentration of suspensions, consisting of a main separation chamber, which is arranged concentrically to it in the plane of the largest drum diameter provided smaller concentrate space over a narrow annular gap is connected, from the concentrate room calibrated channels and nozzles for the discharge of the concentrate emanate and the concentrate room is equipped with openings that can be closed by a piston valve and released for additional sludge discharge.

Such a centrifugal drum is known from DE-OS 25 01 92 ^ and serves to transport the concentrate thrown off in the drum through channels and nozzles from a flow-free concentrate space continuously diverted, with a whirling up of thrown off concentrate by inflowing liquid or Suspension is prevented. In addition, thrown-off solids that cannot be discharged through the nozzles can be fed into specific time intervals through larger openings, which can be closed by an axially acting slide, are thrown out.

Since the channels or nozzles extend from the outer periphery of the outer concentrate space, there is a risk that the Channels or nozzles clog very quickly when solid particles are thrown off that are larger in diameter than the nozzle bores are. There is also a so-called emptying process of the concentrate space, which can be released with the aid of a piston valve larger openings can then no longer reverse the blockage of the nozzle bore, so that an expansion or a manual cleaning of the nozzles is necessary, the disadvantages of which are well known.

In the case of the centrifugal drum mentioned, the concentrate is discharged freely and normally collected in a catcher located outside the drum, with a strong air intake in the Concentrate and thus a strong foam formation occurs.

In many cases, however, the air intake in the concentrate is not desirable, as the concentrate is used or processed further and the intake of air leads, for example, to symptoms of oxidation or infections in the concentrate.

The innovation is therefore based on the task of a centrifugal drum of the type mentioned at the outset so that the concentrate under the exclusion of air while largely avoiding a shower congestion is derived.

This object is achieved according to the invention in that the concentrate draining channels with nozzles arranged therein extend from the inner area of the outer concentrate space and the X-channels end in a concentrate chamber arranged on a smaller diameter to the concentrate chamber, from which the concentrate is released by means of a peeling element is removed from the centrifugal drum under pressure.

Due to the arrangement of the concentrate-draining channels, starting from the inner area of the outer concentrate space, once clogging of the channels and nozzles by thrown off specifically heavier solids and larger solid particles largely avoided, as these solids and solid particles can collect in the outer area of the concentrate space and at certain time intervals through partial or full emptying with the help of a controllable piston valve over larger emptying openings are thrown off. On the other hand, the derived Concentrate discharged under pressure through a peeling device in the absence of air.

The nozzle in the channels near the concentrate chamber is advantageous arranged so that clogging of the nozzle by being thrown off Solids is largely avoided and, on the other hand, the channels of possibly settled during the emptying processes Solids can be spun clean again.

In the drawing, an embodiment of the innovation is shown.

1 with the lower part and with 2 the cover of the centrifugal drum is designated, which are held together by a locking ring 3.

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At the periphery of the lower part outlet openings k are provided which can be closed and opened by an axially acting piston valve 5 surrounding the lower part. The control of the piston valve takes place, for example, with the aid of a control fluid that is fed into an annular channel 7 of the centrifugal drum via a control water supply line 6 and passed on to the communicating chambers 9 and 10 via bores 8. While a permanent liquid pressure in the lower chamber 9 keeps the piston valve in the closed position during operation, an opening process - be it a partial or complete emptying - is initiated by the supply of control liquid into the upper chamber 10, since the liquid pressure is then in of the upper chamber 10 is greater than the fluid pressure in the lower chamber 9. The control fluid introduced into the upper chamber 10 is in each case discharged via a calibrated bore 11 arranged on the outer periphery of this chamber.

The suspension to be concentrated is fed to the drum via the inlet pipe 12 and flows through channels 13 into the main separation space 1 * 1, where essentially the separation of the suspension into a clear phase and a concentrate takes place. While the clear phase flows through a plate insert 15 arranged in the drum for final clarification ( and is discharged from the drum under pressure via channels 16 and peeling element 17), the concentrate passes through an annular gap 18 into an outer, smaller concentrate space formed by the drum base and cover 19.)

While the concentrate comes from the inner area of the concentrate chamber via channels 20, formed from drum cover 2 and separating plate 21, into a concentrate chamber 22 arranged on a smaller diameter to the concentrate chamber and diverted by a peeling element 23 arranged in this chamber under pressure and thus with exclusion of air Specifically heavier solids collect in the outer area of the concentrate space 19, from which these are discharged at certain time intervals via the openings k arranged in the outer area of the concentrate space with the aid of the piston valve 5. The necessary for concentrate formation

i maneuverable nozzles 2k are in the vicinity of the concentrate chamber 22 in the | Channels 20 arranged so that any settled solids in the 3

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Channels 20 under the action of centrifugal force in the full or Partial emptying processes are spun clean again, thereby largely avoiding clogging of the nozzles will.

Claims (2)

PROTECTION CLAIMS 1) Centrifugal drum with a vertical axis of rotation for the concentration of suspensions, consisting of a main separation chamber which is connected to a smaller concentrate chamber arranged concentrically to it in the plane of the largest drum diameter via a narrow annular gap, channels and nozzles calibrated from the concentrate chamber for discharging the concentrate and the concentrate chamber is equipped with openings that can be closed by a piston valve and released for additional sludge discharge, characterized in that . that the concentrate draining channels (20) with nozzles (2k) arranged therein extend from the inner region of the outer concentrate space (1 °) and the channels end in a concentrate chamber (22) arranged on a smaller diameter to the concentrate space, from which the concentrate is extracted by means of a Peeling element (23) is removed from the centrifugal drum under pressure. 2) centrifugal drum according to claim 1, characterized in that the nozzle (2k) is arranged in the channel (20) in the vicinity of the concentrate chamber (22).