Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/13—Supported filter elements
  • B01D29/15—Supported filter elements arranged for inward flow filtration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/62—Regenerating the filter material in the filter
  • B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2201/00—Details relating to filtering apparatus
  • B01D2201/04—Supports for the filtering elements
  • B01D2201/0461—Springs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2201/00—Details relating to filtering apparatus
  • B01D2201/28—Position of the filtering element
  • B01D2201/287—Filtering elements with a vertical or inclined rotation or symmetry axis

Definitions

• the invention relates to a filter candle for a precoat filter for liquids, with an essentially hollow cylindrical perforated support body which carries a filter sock on its profiled outer surface.
• a filter aid for example diatomaceous earth
• the solid particles contained in the contaminated liquid are attached to this filter aid.
• the filter layer consisting of the filter aid has a significantly smaller pore size than the filter medium underneath.
• the present invention is concerned with precoat filters in which a flexible filter stocking, usually made of filter fabric, forms the filter surface on which the filter aid is washed.
• the mechanical cleaning device for removing the dried dirt cake from the filter candle consists of a vibrating drive which shakes the filter candles so strongly that the dried dirt cake falls down.
• the object of the invention is to design a filter candle of the type mentioned in such a way that a safe and complete cleaning of the filter stocking carrying the dirty cake is made possible in a structurally simple manner.
• the support body for mechanical cleaning of the filter stub is movable in the longitudinal direction by a thrust element and that the support body is a coil spring which is supported radially on an inner spring guide body.
• the filter sock with the dirt cake on it lay as far as possible against the outer surface of the coil spring.
• the dirt cake formed on the outside of the filter sock is burst open in all areas of the filter sock and falls down.
• Damage to the filter sock is largely ruled out because the strain of the filter sock is determined and limited by the radial dimensions of the coil spring.
• the existing contour of the filter stocking is changed by the movement of the helical spring, but without the dimensions of the filter stocking being exceeded in the unloaded state.
• the mechanical stress on the filter candle is very low during the cleaning process, there are no bending forces, but only slight axial loads.
• the type of cleaning according to the invention therefore does not restrict the design of the filter candle with regard to the choice of material, weight, geometric dimensions and handling.
• the material for the filter sock there are practically no restrictions on the material strength due to the cleaning process.
• the helical spring connected at its lower end to the thrust element carries on its outside the filter sock, which lies against the turns of the helical spring.
• the distances between the individual turns of the helical spring enable the filtered liquid to pass through unhindered.
• the coil spring is deformed, preferably compressed, the distances between the turns changing substantially uniformly over the entire length of the spring.
• the radial guidance of the coil spring on an inner spring guide body has the effect that the coil spring forming the support body essentially maintains its cylindrical shape.
• the helical spring is designed as a compression spring, because lateral buckling is prevented even with long spring lengths.
• the guidance of the helical spring makes it possible to arrange the filter candle not only vertically, but also horizontally or obliquely, without the support body for the filter, which is elastic and being formed by the helical spring, sagging.
• a compression spring is arranged between the head piece and the end of the thrust element protruding through the head piece.
• This compression spring and the helical spring which is under compressive prestress and form the support body, act in opposite directions on the two ends of the thrust element. If one end of the thrust element is pressed by means of the cleaning drive or a pressure force maintained during filter operation is released, the helical spring forming the support body is deformed, so that the cleaning process is carried out. The push element then returns to its original position. It is particularly advantageous that the cleaning drive only has to exert a compressive force on the thrust element. It is therefore not necessary to firmly connect the cleaning drive to the thrust element.
• the thrust element is expediently formed by an outlet tube which has at least one inflow opening within the filter candle and at least one outflow opening for the filtered liquid at its end projecting through the head piece. Since the outlet pipe which is often present in any filter candle in filter devices at the same time also represents the push element for the cleaning movement, a separate push element, for example a push rod, can be dispensed with. This simplifies the construction of the filter cartridge and reduces its weight. Since the bending stiffness of the outlet pipe is relatively high with low weight, long filter cartridges can also be installed horizontally or at an angle.
• the outlet pipe has the outer longitudinal ribs forming the spring guide body, which can be attached to a sleeve pushed onto the outlet pipe.
• the inside diameter of the outlet pipe can be selected to be substantially smaller than the inside diameter of the support body, so that the flow velocity within the outlet pipe is high.
• the drawing shows a filter candle 1.
• a plurality of filter candles 1 are arranged in the housing of an schwnschwemmfiltervoriques and are carried by a partition wall 2, which is only indicated by dash-dotted lines in each bore 3.
• the partition 2 divides the housing of the flood filter device into a clean room 4 and a dirty room 5.
• the liquid to be cleaned flows from the outside in through the filter candles 1, on the outside of which a filter aid, for example diatomaceous earth, was previously washed.
• the filter candle 1 v / has a head piece 6, which is inserted sealingly into the bore 3 of the partition 2.
• An outlet pipe 8 projects through a central bore 7 of the head piece 6 and is firmly connected to a bottom piece 9 at its lower end.
• a helical spring 10 is arranged between the head piece 6 and the base piece 9 and carries a filter sock 11 on its outer surface.
• the helical spring 10 forms a hollow cylindrical, perforated support body with a profiled outer surface for the filter sock 11, which also extends from the head piece 6 to the bottom piece 9 and is fastened there by a screw cap 12.
• the outlet pipe 8 carries, over the greatest length of its section projecting into the dirt space 5, a pushed-on sleeve 13 which has, for example, four longitudinal ribs 14.
• the outwardly projecting longitudinal ribs 14 form a Feder Schollirungskorper for the coil spring 10 so that it maintains its substantially cylindrical shape.
• end of the autotube pipe 8 carries an end ring 15 which forms a spring abutment for a compression spring 16 which is supported with its other end on the head piece 6.
• inflow openings 17 are provided directly above the base piece 9, through which the filtered liquid flows into the outlet pipe 8.
• the liquid flows to the other end of the outlet pipe 8 and leaves it through outlet openings 18 in the clean room 4. Since the inlet openings 17 are only arranged at the lower end of the outlet pipe 8, the air pressed into the dirty room 5 at the beginning of the drying process can only then reach the clean room 4 flow when the liquid level in the dirt chamber 5 is lowered to the lower end of the filter candle. Since the inside diameter of the outlet pipe 8 is considerably smaller than the inside diameter of the helical spring 10, the outlet pipe 8 has a relatively high diameter.
• Flow rate In the clean room 4 there is a common plate-shaped stop body 19 above the upper end of the outlet pipe 8 and possibly above other filter candles, which can be driven by a cleaning drive, for example a compressed air cylinder (not shown), for lifting movements.
• a cleaning drive for example a compressed air cylinder (not shown), for lifting movements.
• a filter layer on the outside of the filter sock 11 is first washed up by adding the filter aid, for example diatomaceous earth, to the liquid.
• the filter aid for example diatomaceous earth
• the outlet pipe 8 is moved by the cleaning drive During the filter process, the outlet pipe 8 was pressed against the force of the compression spring by the stop body 19 16 is held down for cleaning, the stop body 19 is raised, the compression spring 16 moves the drive tube 8 upwards, the helical spring 10 being compressed, thereby tightening the filter sock 11, which is attached to the windings of the clasp cap spring 10 has also compressed, so that the dirt cake on it breaks open and falls off.
• the compression spring 16 moves the outlet pipe 8 again in the opposite direction through the bore 7; the coil spring 10 is again stretched to its original position. A new precoating process then begins, followed by a new filtering process.
• the coil spring for the cleaning process can also be stretched by pressing on the outlet pipe.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Filtration Of Liquid (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6320879

Family Applications (1)

Country Status (2)

Cited By (2)

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Citations (3)

Family Cites Families (3)

• 1987
  • 1987-02-13 DE DE19873704475 patent/DE3704475A1/de active Granted
  • 1987-11-16 WO PCT/EP1987/000715 patent/WO1988006056A1/de unknown

Patent Citations (3)

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