DK141315B - screening unit - Google Patents

Description

(11) PROMOTIONAL REGISTRATION 141315 DENMARK <«> mt.ci.sb 01 o 35/02 § (21) Increase No. lW75 (22) Closing date on 11 * Jan * (23) Running day 11 · jil · 1975 (44) ) Increases submitted and 1qq0 submitted by the publisher were published then O · XoO. 1 yo

DIRECTORATE OF

PATENT AND TRADE MARKET <* »Priority shifted from it

Jan 21 1972, 2202759 »DE

(71) SIEMENS AKTIENGESELLSCHAET, Berlin and Munich, 8 Munich 2, Wit-Telsbacherplatz 2, DE.

(72) Inventor: Klaus Ruthrof, Eichenweg 8, Erlangen, BE: Ingeborg Prud = lo, Gerhard-Haupimann-Str. 1, Erlangen, DE.

(74) Plenipotentiary in proceedings

The engineering company Giersing & Stellinger.

(84) screen decoration.

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a sieve device consisting of mn in a conduit built in conically tapered in the flow direction, and at whose tip is connected an outgoing discharge pipe for solids deposited on the inside of the sieve, in which one of the shut-off valves is arranged.

Such a sewing device is known from DE presenting 1 - Session 2 Ο63 891. However, with the known sewing device, difficulties arise when the washing which is to be

10 is purified, resulting in flat or woven solid «S

2 141316 which is deposited on the inside of the screen and is retained there by the outward differential pressure. In this connection, it is known from DD patent 15 681 to cleanse the inside of the screen by spraying water on the inside of the screen through the rotary nozzle devices.

Thereby, however, virtually no contaminants that are stuck in the holes of the screen can be removed. Therefore, further mechanical cleaning of the sieve during the shut-off of the flow is also required here.

The invention has for its object to provide a sieve of the type indicated in the preamble, by which the inside of the sieve can be safely cleaned of such flat or wiry solids without completely interrupting the main flow.

According to the invention this is achieved by the fact that in the interior of the screen there is arranged a shut-off damper of a diameter corresponding to the inside diameter of the screen at the installation site and that the installation site of the damper is at such a distance from the foot of the screen that -20 becomes a free ring slit on the outside of the sieve.

Closing this damper in the inflow area of the screen, whereby, due to the damper's mounting location, no complete interruption of the main flow occurs, a surprising effect occurs. Within the sieve, in the area behind the damper, fluid streams are formed, whereby the solids attached to the inside of the screen are released from the sieve plate and radially inward and towards the damper. Now, when the damper disposed in the drain pipe, which has been closed during this disassembly process, 30 is partially or completely opened, while the damper in the sieve is opened somewhat, the solids washed away from the sieve plate are safely discharged through the drain pipe. When the solids have been drained, the damper in the drain pipe can again be closed, so that an excessive amount of 3.5 of the liquid for cleaning is not useless.

The invention will be explained in greater detail below with reference to the drawing, which schematically shows the construction and operation of a screen device according to the invention.

In the embodiment shown in the drawing, a filtration screen 2 is embedded in a pipeline 1 through which a sink to be cleaned from left to right * The filtration screen 2 is designed to be conical extending in the flow seal. However, it is also possible to use a pyramid shaped or an approximately cylindrical shaped filter screen. A cut-off tip 3 is connected to the cut-off point 3 of the filtering screen 2, through which the solid material retained by the filtering screen 10 can be removed * In the drainage pipe k, a removable damper 5 is installed, which is normally closed during normal operation. not too much water flows away from the main circuit *

The solid materials carried by the sink to be cleaned are retained by the filter stirrer and can be largely carried away by means of “IÉgMøerut 4. However, when the sink is heavily contaminated, flat or wood-borne solid materials become solid materials for it. mostly hanging on the inside of the filtering screen and 20 being held by the differential pressure between the inside and outside of the filtering screen on the faces of the screen.

In order for these flat solid materials to be removed from the inside of the filtration screen without interference from the outside and without completely blocking the flow, according to the invention, in the inflow area of the filtration screen 2, a damper 6 is arranged, which upon closing practically closes the entire section of the screen behind the damper 6 * It is therefore convenient to place this damper 6 at such a distance from the foot of the screen 7 that there remains on the outside of the filtering screen 2 a free annular flow gap 8 through which a portion of the liquid can continue to flow. When the damper is closed, rotating swirls 9 form on the inner surface of the filtration screen, which detaches the deposited solid materials from the zones near the walls of the filtration screen 21 and transports them towards the flap 6.

This vortex is substantially upturned U1316 by the remaining amount of water flowing through the annular slot 8. When, after releasing the solid materials from the inner surfaces of the filtration screen, the damper 5 is opened in the drain pipe kr, the vortex formation 5 in the area behind the filtration screen is interrupted and the loosened solid material is quickly diverted via the drain pipe 4. This flushing can be supported and accelerated by opening the damper 6 easily from the locking position so that part of the main flow can also flow into the space behind the damper within the filtration screen 6th

To purify such a filtration screen, no additional amount of rinsing water is required. Furthermore, an almost continuous purification of the main water flow and of the filtration screen is possible, since the main flow does not need to be completely shut off and since the purification of the filtration screen is possible, within a very short period of time by closing the damper. Such purification of the filtration screen can be performed fully automatically at specified intervals, e.g. the differential pressure in front of and behind the screen can be measured, and at too high a differential pressure which indicates a strong soiling of the filtration screen, the cleaning of the filtration screen can be initiated automatically.