DE1761915C - Screw screen centrifuge - Google Patents

Description

The invention is directed to a screw screen centrifuge with a conical shape towards the discharge end extended sieve drum and an approximately equi-conical discharge screw and with one approximately central, cylindrical, at least partially designed as a retaining ring with a closed cylinder surface, on the continuous fine sieve of the sieve drum attachable sieve shell part and this associated detergent feed devices in the discharge screw.

Screw screen centrifuges of this type have proven to be Proven to be very beneficial for a thorough washing of the spun, due to the arrangement of the cylindrical screen shell part, the material to be centrifuged quickly slipping through the washing zone is prevented, so that in this or on the cylindrical screen jacket part there is a thicker solid-Itoff layer forms, which migrates relatively slowly through the washing zone and thereby more intensively can be washed.

In a known sieve centrifuge of this type (German Patent 1151763) the cylindrical Sieve shell part formed in that the sieve drum consists of two connected to one another by means of flanges Screen drum parts is produced, with a corresponding one to achieve the cylindrical screen casing part Part of the sieve drum itself is cylindrically shaped and with openings for the passage of Liquid is provided. This initially results in a much more complicated production the sieve drum. Above all, however, it has proven to be disadvantageous that with such a training the attachment and fastening of the fine sieves " makes great difficulties on the inside of the sieve drum, especially special fine sieves " \ must be used which exactly match the dimensions of the respective sieve drum must be coordinated. Furthermore, in the known Construction the washing effect in some cases noi-h not fully satisfactory because the washing liquid too quickly through the openings provided in the area of the cylindrical sieve chamber is thrown off. Finally, there is a disadvantage in the known construction that the The washing zone in the axial direction of the sieve drum is not in a crimping position, however, in Abhlingigke.i \ on the type or moisture level of the Sluggish things are very desirable in many cases is.

A construction has still become known (cisutsche patent specification 1212 00 (1). at which, in the case of a continuously conical centrifugal drum, is inserted into this tin or several rings which have a perforated cylindrical part and are in communication with these grooves associated detergent supply device · form washing zones. But also with this construction Siutzrings or the like must be fixed at certain points on the sieve or centrifugal drum, on which the cylindrical perforated. Support ring parts. This means that ix; In this construction the attachment of the fine-eye difficulties power and the washing zone in axial.: Direction of the centrifugal drum or sieve drum not.: R. can be attached at any point.

The same applies to another well-known KiMi struktion (German Auslegeschrift 1 108 150). Iv ^ which au to form thin auxiliary filter layers; the sieve lining of a sieve drum bead-shaped Rings by holding means, such as neck brackets, anbrinii are cash. It is true that oei the known design is proposed to attach these rings by holding brackets, the free ends of which pass through two sieve meshes and two drum slots and durei. Screws are attached, such a fastening but is practically impossible without damaging the fine sieve or the Sicbbelags, apart from there from. that the sieve drum is in many cases not or only with great difficulty accessible from the outside, namely only after Fernurj; of the thrown off liquid collecting and discharging closed outer drum sleeves.

Finally, a continuously operating sugar centrifuge became known (German Auslegeschrift 1 197 029Λ at the inside of the centrifugal drum on the fine sieve approximately in its In the middle a circulating ring is arranged, which has a lower rising cylindrical ramp surface, a has upper guide tongue and between these one or more cascade-shaped troughs. The order this circulation ring on the fine sieve is problematic in the same way as with the both of the constructions discussed above, especially if it is to be ensured that there is no sugar seeps through between the fine sieve and the retaining ring or the circulating ring.

The object of the invention is to create a screw screen centrifuge in which when maintaining a simply constructed, i.e. continuously conical, sieve drum and, if used, likewise continuous normal fine sieves the attachment of a retaining or circulating ring of the last

³ 4

described type of in the axial direction any 'an intermediate gear 4 with centrifugal coupling, a

Body in such a way is mogheh. that Oesehadi- Selimier.tofTeinnchtung 5 and a drive shaft 6

guneii the fine sieves cannot and does not exist

However, such a fixed position of the damper ring on the _Dic drive shaft 6 directly drives a discharge

Feinsie.-j it is ensured that between these partial worms 9 and via a gear 11 with higher

len sugar cannot pass through. Speed of a sieve drum 7. soft one to the sieve

In a corner sieve centrifuge, the last jacket surface inclined in the opposite direction

schrieivnen type, that is, one with an outer jacket Ta , between the and one

_{to be} applied conically widened sieve drum sieve drum bottom 38 an annular gap 8 for the liquid

niei and an approximately equally conical _discharge liquid outlet is provided. "

schn-cke and ir. with a roughly short, cylindrical shape. At a BEFE _s rigungsring35 at the Siebtrommelal-Maunng least partially · closed wave is by means of support brackets 36 is a baffle ring 10 rui.rrlache with Z \ !; formed on the durchgehen- cylindrical inner surface "10" attached, and z ^ ar the! sieve of the sieve drum attaching the sieve by simply clipping on the retaining ring au! is sieved, which is solved by appropriately tightening the dilution according to the invention. Binding screws 35u on the fastening ring 35: - it follows that forms the cylindrical sieve component. Between the stowage, ing 10 and the Fixed to-S; ig .. befestighar supply ring on the shaft of the sieve drum 35 is only of the holding brackets:> \ ~: mc can be seen on this training κ'.ηιηύ gebi 20 interrupted annular slot 37 '?.. det.Ivi.: -. g a normal, continuously conical sieve The centrifugal material "" is used via a feed 21 of the ti, ..: el and is also fed to a centrifuge and passed through spacer webs 22 into a normal fine sieve, which is shown in dashed lines in the direction of FIG. i overlapping arrangement in front of: a supply of Linfe vorbeschlcunigt and passes over the edge r, ■■ ;, can be separated, since as a result of the fastening of a pre-accelerator 73 on the sieve drum in ρ, the storage ring on the sieve: r.nv .inelike the smallest diameter range of the same. ti .. ::;: che sieve jacket of fastening means voil- The washing liquid is via a stationary s:.: ig can remain free. Here k;: n: i through ent- line 24 and a likewise stationary ring chamber; ·· Mende arrangement of fasteners between 25 "through openings 26 in an annular space 27 S1 9 and is guided by the tightenable screws, the retaining ring so tightly over the openings 28 along which the fine sieve is pressed in FIG ...: any seepage of sugar between the discharge screw provided openings 29 in K ^; -i storage ring and fine sieve is reliably avoided, an annular collecting space JO and from there

··; The training is very simple. 35 over the edge 31 from a very short distance

w. · .-, between the damming ring and a fastening veil-like on the solid on the cylindrical

ρ - .. Ming on the sieve drum shaft only from surface 10 a of the retaining ring 10.

Ii. .; ironing interrupted ring contactor is formed, ring around the sieve drum 7 is a liquid

ik:.;: - t. that the washing liquid is arranged unhindered by discharge housing 12, which has an inner

ik -en ring slot can get onto the storage ring. 40 manLeIl3, the latter being a conical one

V. is recognizable. enables such a design part 13a, which is opposite to the annular slot 8

bii: ung easily arranged by appropriate fastening of the sieve drum 7 and opposite

£:.:; L of the reservoir rock as well as the correspondingly assigned zürn sieve jacket is inclined. The top

Wa-chmittelzufiihrvorrichUingen on the Siebtrom- and lower edges of the inner jacket 13 run

n :. i the anorunation of the washing zone at any 45 inclined outwards. Between the upper part 32

Steep seen in axial direction. and lower part 33 of the space between the

As an advantage, it has also proven that the housing 12 and the inner jacket 13 are connecting

the detergent supply devices one provided within openings 14.

the screw formed annular collecting in the lower part of the liquid discharge area

Has space, over the edge of which the washing liquid 50 is an inner one by means of a further inner casing 16

ke; t formed from a very short distance on the on the annular chamber 34, from which a line

The solid veil of solid material attached to the cylindrical shell part 18 leads to a liquid drain 17. Furthermore,

iiitig distributed is directed. binder lines i5 the space32,33 between the

An embodiment of the Eilinden is in the housing 12 and the inner jacket 13 with the

Drawing shown. It shows ₅₅ atmosphere.

F i g. 1 are a screw sieve groove according to the In the path of the thrown-off solid

Invention in side view, partly in section, two oppositely inclined impact rings

reproduced, 19 and 20 arranged.

F i g. Figure 2 shows a side view and a top view of the operation of the centrifuge is as follows:

the damming ring according to the invention and 60 The material to be thrown is controlled via task 21

F i g. 3 shows a detailed section, which the arrangement is fed continuously and creeps from the point small-

of the retaining ring as well as the assigned detergent diameter of the sieve drum? in familiar

feed devices on the discharge screw again-way continuously over the screen surface to the

are. larger diameter end, with the largest part

The screw screen centrifuge has a main 65 thrown off the liquid and after deflection

housing 1, above which a total of at the upper end of the sieve drum along the

2 designated drive structure is arranged, opposed to the conical outer jacket surface 7 α the

which is fed in detail from a drive motor 3.

After a certain degree of dryness has been reached, the moving solid hits the retaining ring 10 and is diverted onto the cylindrical surface 10 'of the same. Α on the cylindrical surface 10 forms a thicker FeslstolTschicht which is moved slowly from the pursuing the solid, so that the supplied via the discharge screw 9 the washing liquid can cause an intensive washing effect here. The washing liquid is passed from close proximity onto the cylindrical surface 10 α of the Slauringes 10 via the routes described above.

After leaving the retaining ring 10, the washed solid is returned to the cover surface the sieve drum 7, where it is dried again and slides towards the discharge end of the drum. The discharge screw 9 allows the solid to slip through directly in a known manner not too, rather it delays the discharge of the solid without damaging it, whereby the Delaying effect of the discharge screw V due to the ratio of the screw speeds and sieve drum as well as the inclination of the screw threads is determined.

The dried, radially flung solid slolf

meets the alternately inclined baffle rings 19 and 20, through which the solid material gently is decelerated and then falls into the solids discharge space.

All of the thrown-off liquid exits the sieve drum 7 through the annular gap 8 and first hits the oppositely conically inclined part 13 a of the inner jacket, from which the main part of the liquid is directed downwards and drained off through the outlet Y ¹ .

The remainder of the liquid consisting of moisture vapor can settle in the upper area of the inner jacket 13 knock down and over the curved edge into the space between inner jacket 13 and Get housing 12 and from there via the openings 14 and the lower area 33 of the room to Procedure 17.

As already mentioned above, the annular chamber 34 and the connecting line have the effect that the air flow can flow back, so that a jam in the drain 17 is prevented while the lines 15 prevent the build-up of overpressure in space 32 and 33.

1 sheet of drawings

Claims (3)

Patent claims: 1. Screw screen centrifuge has a cone-shaped widened to the discharge end. Viewing drum and an approximately equally conical discharge screw and with an approximately spherical, cylindrical, as a retaining ring, at least partially with a closed cylinder surface ^1; With the trained screen shell part that can be attached to the continuous fine screen of the screen drum and the material feed devices assigned to it in the discharge screw. characterized in that the retaining ring (10) forming the cylindrical screen casing part can be fastened to the shaft of the screen drum. 2. Schnecktnsiebzemrifuge according to claim 1, characterized in that between the retaining ring (10) and a fastening ring (35) on the Siebtrommeiwelle an annular slot (37) interrupted only by retaining brackets (36) is formed. 3. screw screen centrifuge according to claim 1 or 2, characterized in that the Waschmitielzufuhrvorrichtung has an annular collecting space (30) formed within the screw (9), over the edge (31) of which the Wash liquid from a very short distance on the on the cylindrical shell part (10 «) seated festivities / veil-like \ granted headed will.