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
  • B01D29/62—Regenerating the filter material in the filter
  • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
  • B01D29/6407—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes
  • B01D29/6415—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes with a rotary movement with respect to the filtering element
• • 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
  • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
  • B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring

Definitions

• the present invention relates to an apparatus of the kind disclosed in the preamble to claim 1 , for cleaning liquid filters, particularly of the types such as filter clothes, micro-strainer fabrics and the like.
• filtering liquids e.g. water
• blockage of the filter occurs sooner or later.
• the filter is then usually flushed in the reverse flow direction or exchanged, which takes place at regular intervals.
• the problems then arising are: that reverse flow flushing causes the flow to pass through the filter where resistance is least, i.e.
• the object of the invention is to solve the problems enumerated above, which is realised by utilising 15 the characterizing features disclosed in the claims.
• Raw water, or unfiltered water is supplied to a filter 1 via an inlet pipe 2, which is connected to a raw water source F via a pipe 3.
• the filter 1 divides a filter housing 4 into a primary part 5, in which the pipe 2 opens out, and a secondary part 6, in which an outlet pipe opens 5 out.
• the outLet pipe 7 is provided with a throttle valve 8 and leads to an outlet.
• a flushing pipe 9 also opens out into the primary part 5, this pipe is equipped with a flushing member 10, extending along the entire length of the filter 1.
• the 0 member 10 also carries a brush 11.
• the filter 1, formed as a cylindrical drum, is mounted for rotation in the housing 4, and may be driven by a motor 12.
• the slide valves 13 and 14 are provided for regulat ⁇ ing the apparatus and initiating the cleaning phases.
• the 5 first slide valve 13 has a slide 15, urged by the bias of a spring 16 towards a chamber 17.
• the slide 15 coacts with a stop 26, and in this position the inlet pipe 2 is put in communication with the pipe 3 leading to the raw water source F, while the outlet pipe 7 is open up to the throttle valve 8, which has the outlet downstream of it.
• a stop 27 to the right in relation to the position illustrated on the drawing
• the inlet pipe 2 is in communication with a waste outlet D, while the outlet pipe 7 is closed off.
• the second slide 14 has a slide 18, urged by the bias of a spring 19 towards a chamber 20.
• the slide In a first operat ⁇ ive position (illustrated on the drawing) , the slide coacts with a stop 28, and in this position there is a pipe 21 between the chamber 20 and valve 14 in communication with the waste outlet D in a second operative position the slide 18 coacts with a stop 29 (to the right in relation to the position illustrated on the drawing) , and in this position the pipe 21 is in communication with the pipe 3 and the raw water source, while the filter housing 4 is in communication with atmosphere via the outlet pipe 7, a pipe 23, a duct 24 in the slide 18 and a vent 25.
• the valve 14 thus forms a sensor for sensing the pressure on the secondary side of the filter.
• the apparatus functions in the following manner.
• the filter 1 is supplied with raw water at a pressure of 0.03 - 1.0 MPa from the source F via pipes 3 and 2.
• the slide valves 13 and 14 are then in the positions illustrated on the drawing.
• the filtered water flows via the outlet pipe 7 past the throttle valve 8.
• the latter is adjusted so that the pressure on the filter secondary side, and consequently in the pipe 23, is sufficient to keep the slide 18 at the stop 28 against the bias of the spring 19.
• the flushing pipe 9 is simultaneous]y put into communication with the pipe 3 and the raw water source F, this water then flushing via the member 10 over the outer surface, i.e. the primary side, of the filter 1.
• the slide valve 14 also puts the vent 25 in communication with the filter housing 4 via the duct 24 and pipes 23 and 7, thus venting the housing to atmosphere.
• the raw water in the inlet pipe 2 thus flows in the opposite direction to that of normal filtering.
• the flushing effect is supported by brushing the filter surface. This can namely be carried out by starting the motor, with the aid of such as sensors on the slides, thus causing the filter drum to rotate against the brush 11.
• the cleaning phrase has come to an end, and with the aid of such as a setable timing means, the supply of raw water can be stopped, e.g. by shutting down the feed pump supplying the plant with raw water.
• the pressure in the pipe 21 then falls, allowing the bias of the spring 16 to move the slide 15 back to the stop 26.
• the raw water source F is then caused once again to supply raw water, and the housing is filled, the pressure on the secondary side and in the pipe 23 then becoming sufficient for the slide 18 to move back to the stop 28.
• the pressure in the pipe 21 is thus resolved via the pipe 22. Since cleaning of the filter in accordance with the invention takes place on the primary side, and with the aid of brushing, there is effective rapid and economical clean- ing, even if microfilters.
• the invention is, of course not confined to the described embodiment. Accordingly, flushing clean with raw water may take place in the same flow direction as for normal operation, the inlet pipe 2 then being connected to the raw water source, and the flushing pipe 9 to waste- Neither does the brush need to have the implementatio ⁇ described, and in this context the brush is understood to mean any kr& of mechanical ⁇ leaning means that can engage against the primary side of the filter.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Separation Using Semi-Permeable Membranes (AREA)
• Measuring Fluid Pressure (AREA)
• Filtration Of Liquid (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20364887

Family Applications (1)

Country Status (3)

Cited By (3)

Citations (3)

• 1986
  • 1986-06-23 SE SE8602774A patent/SE8602774L/sv not_active Application Discontinuation
• 1987
  • 1987-06-22 WO PCT/SE1987/000290 patent/WO1987007850A1/en unknown
  • 1987-06-22 AU AU76480/87A patent/AU7648087A/en not_active Abandoned

Patent Citations (3)

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