EP2948232A2 - Integrated multiple-stage auto-self-cleaning filter - Google Patents
Integrated multiple-stage auto-self-cleaning filterInfo
- Publication number
- EP2948232A2 EP2948232A2 EP13865722.6A EP13865722A EP2948232A2 EP 2948232 A2 EP2948232 A2 EP 2948232A2 EP 13865722 A EP13865722 A EP 13865722A EP 2948232 A2 EP2948232 A2 EP 2948232A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- stage
- filtration
- filtrate
- backwash
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 118
- 239000012530 fluid Substances 0.000 claims abstract description 60
- 239000000706 filtrate Substances 0.000 claims abstract description 59
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 21
- 238000011001 backwashing Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000013461 design Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000010618 wire wrap Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000013508 migration Methods 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 210000004907 gland Anatomy 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910003480 inorganic solid Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 239000005416 organic matter Substances 0.000 description 1
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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
- B01D29/50—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 multiple filtering elements, characterised by their mutual disposition
- B01D29/52—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 multiple filtering elements, characterised by their mutual disposition in parallel connection
-
- 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
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/668—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with valves, e.g. rotating valves for coaxially placed filtering elements
Definitions
- the invention relates to an integrated multi-stage auto-self cleaning filter assembly to separate solid particles from ballast or sea water, or other low-viscosity liquid.
- the invention aims at providing a continuous output with zero downtime, wherein the filtrate of the first stage automatically becomes the input for the second stage filtration.
- prior art filters comprise of the filter element which either use a flat element or bend and curve flat panels into cylindrical element(s) with large diameters (usually upwards of 300mm).
- Flat sheets of the wire mesh are placed above flat sheets of the triangular wire profiles. These are then sintered and fused to each other at multiple points to eliminate mesh migration or distortion during filtration or backwash.
- This sintered flat sheet is either used as in a plate filter, or is bent and welded together longitudinally, to form a cylindrical filtration element.
- manufacturing using the described method is not suitable to manufacture cylinders of less that 300 mm in diameter. If it is attempted, the chances are high that the bond formed between the woven wire mesh and the triangular wires sheet by sintering would be sheared.
- the filter in the present invention relates to the filtrate moving from out to in and the velocity of the filtrate is constant even during backwash time.
- This novel feature of the filtrate velocity being almost constant even during backwash, is due to the fact that >a pair of filter modules diagonally opposite to each other are sealed on the top and the filter module undergoing backwash is sealed at the bottom also, thus forcing the input liquid into the remaining filter elements at a higher pressure, which results in a better flow of the filtrate.
- the objects of this invention include provision of:
- a filtration assembly which houses all stages of filtration in a single, integrated housing, doing away with the need for providing for channels for fluid to flow from one unit to the next, thus saving space with regard to the systems used in multiple locations for multiple levels of filtration.
- the flow of fluid between the first and second stage of filtration is in such tight integration that the outlet of the first stage is the inlet of the second stage without any means of conveying.
- the Filtration assembly features a tangential inflow for the first stage, which is configured to fall on a conical screen which is placed at an incline which works on the principle of Hydrocylone due to its angle of incline, which ensures that the solids which are accumulated on the screen are continuously evacuated due to the Coanda Effect from the first stage through an open drain nozzle at the bottom thereby eliminating the need for manual evacuation of solids in the first stage of filtration.
- the filtration assembly discloses the specific use of surface filter with Out to In Flow mechanism by the placement of the wire mesh layers on the outer side of the filter element.
- the filter element consists of the inner core screen made of triangular wire with support rods; completely draped by a multi-layered sintered mesh as the outer layer, when the outer layer is welded permanently at regular intervals to the inner core screen, which is configured to bear much stress and strain due to minimal displacement of the wire mesh layers.
- the filter assembly features a movable T Shaped arm that caps the top of two independent filtration modules positioned diametrically opposite each other and where with the filtrate of the one module backwashes the other.
- the increased efficiency of the back wash is due to combination of three factors - differential pressure between the module undergoing back wash and outside atmosphere; increased flow velocity during back wash and venturi effect of the wedge shaped surfaces on the inside of the cylindrical filter.
- EP 1470080 Al titled "Apparatus and method for separating and filtering particles and organisms from flowing liquids” provides for a device for separating and filtering particles and organisms from a high volume flowing liquid operating under low pressure.
- the device includes a conical or cylindrical shape inlet chamber were liquids enter tangentially creating a circular flow without creating a vortex, the liquids accelerate into a separation and filter chamber where the liquids spin around a longitudinally disposed filter element in the centre of the chamber , with the centrifugal forces separating out larger and heavier particles towards the perimeter of the separation and filter chamber, and where smaller particles having a specific gravity closer to that of the liquid are filtered when the liquid penetrates through the filter element wall into the centre of the filter element and flows out one of the longitudinal outlets of the unit.
- Ultraviolet light irreparably damages bacteria, microorganisms and pathogens contained in processed ballast water and may be incorporated as part of the system. ' ,
- US 8146662 B2 titled "Well screen assembly with multi-gage wire wrapped layer” provides for a well screen assembly includes an elongate base pipe and a wire wrap layer.
- the wire wrap layer includes a wire wrapped around support ribs.
- the wire wrap layer has an axial end section wrapped at a first gage and an intermediate section wrapped at a second, larger gage.
- a mesh layer is provided around the wire wrap layer.
- An outer shroiid is provided around the mesh layer, the outer shroud sealed to the wire wrap layer.
- a filter assembly including a housing with a plurality of individual filter units circumferentially arranged within the housing.
- the housing is compartmented to channel a contaminated fluid to be filtered in a filtering direction through the filter units, from one end thereof to the other.
- a rotatable, conduit-like backwash arm is disposed in at least one end of the housing for sealed engagement with the contaminated fluid inlet, end of a filter unit and for receiving a backwashing fluid flow therefrom.
- a rotatable discharge pipe connects to the outlet end of the arm and extends from the housing through a rotaiy-axial bearing and seal unit thereon, and is coaxially arranged with respect to the circumferential array of filter units.
- a rotation indexing unit adjacent the housing engages the discharge pipe for angularly shifting said backwash arm from filter unit to filter unit and thereby for backwashing of said filter units in a desired sequence.
- An axial shift unit engages the discharge pipe for axially shifting the backwash arm away from the filter units preparatory to each angular shift, and for axially shifting the backwash arm into sealed engagement with a new filter unit following such an angular shift.
- a control coordinates actuation of the rotational indexing unit and axial shift unit for sequentially backwashing filter units of the array.
- a rotatable backwash arm is provided at each end of the array of filter units, movement of the arms being synchronized and the arms being axially opposed for sequentially backwashing the filter unit with a backwashing fluid other than the filtered fluid.
- the axial shift unit comprises a camming device directly responsive to rotation of the discharge pipe for carrying out the axial shifting of the backwash arm.
- the present invention aims at providing a single filter equipment with a small footprint, bolted down, which provides for two stage filtration with automatic self- cleaning and zero downtime.
- the invention aims at providing a continuous output with zero downtime.
- the unique design provides for efficient back washing, using a rotating arm which locks two diametrically opposite filter elements simultaneously in such a manner that the filtrate of one candle is utilised as the backwash liquid of the other candle and the backwashed liquid is flushed out from the bottom of the filter element by means of a drain which rotates in tandem with the arm and is connected to the arm by means of a shaft. The said drain is engaged to the module to which the backwash is to be done and moves from one module to another.
- the upward velocity is increased in all open filtration modules include the module that is dedicated to supply backwash filtrate.
- the increased velocity contributes to the efficient back wash.
- the common chamber stops receiving filtered fluids from the pair of modules that are capped with the T shaped arm, but the remaining modules continue to discharge filtered fluid into the common chamber thereby providing a continuous output with zero downtime.
- stage 1 which contains suspended solids between 200 to 400 ⁇ is used as the input for stage 2, thus reaching a filtration of solid not more than 30 ⁇ level in a single unit.
- stage 1 contains suspended solids between 200 to 400 ⁇ is used as the input for stage 2, thus reaching a filtration of solid not more than 30 ⁇ level in a single unit.
- the constant drain being open in the stage 1 filter results in the solids being drained out simultaneously from the stage 1 filter, without any manual interference to clean the same, resulting in zero downtime for stage 1 filtration,
- the body comprises of even numbered plurality of filtration modules wherein each filtration module comprises a plurality of surface filtration filter elements.
- the novelty lies in the arrangement of a movable T shaped arm that caps the top of two independent filtration modules positioned diagonally opposite each other. '
- the movable T shaped pipearm is connected to the movable pipe arm via a shaft such that the pipe arm becomes the discharge route for the slurry from each of the plurality of the module during back wash cycle.
- Novelty lies in the auto cleaning first stage filter integrated with the second stage filter in a single housing with continuous fluid flow contact between first and second stage, with no manual interference to clean the filter elements in either stage, wherein the direction of the filtrate is always out to in.
- the back wash cleaning is triggered by the differential pressure between the inlet and outlet port of the second stage and the self-cleaning is done within 15 to 20seconds/cycle, each cycle comprising of all the filter elements.
- the backwash process is completed with zero downtime and the filter is designed for continuous output. It is further the object of the present invention to utilize the filtrate of one independent filtration module to backwash the diagonally opposite filtration module. This leads to greater velocity of fluid flow resulting in greater back wash efficiency and at the same time retaining a constant output of the filtrate from the 2 nd Stage.
- Figure 1 provides for the front view of the preferred embodiment
- Figure 2 provides for the Front view of the bottom chamber
- Figure 3 provides for the Cross Sectional Top View of the Bottom Chamber
- Figure 4 provides front view of the bottom chamber along with the conical screen placed at an incline
- Figure 5 provides for the Front view of the Moving Arm (back wash slurry discharge arm)
- Figure 6 provides for the Cross sectional top view of the backwash slurry discharge arm
- Figure 7 provides for the front view of the intersection between the Bottom Chamber and Main Body
- Figure 8 provides for the top cross sectional view of the intersection between the
- Figure 9 provides for the front view of a single Filtration Module
- Figure 10 provides for the Cross sectional top view of the Single Filiation Module
- Figure 11 illustrates the front view of the top chamber
- Figure 12 provides for the cross sectional top view of the top chamber
- Figure 13 provides for the Front view of the T Shaped Arm (back wash cleaning arm)
- Figure 14 illustrates the Front view of the gland assembly
- Figure 15 illustrates the front and cross sectional top view of the Collor used for the sealing system between the T shaped pipearm and the filtration module
- Figure 16 illustrates the front and cross sectional top view of the plate used for the sealing system between the T shaped pipe arm and the filtration module
- Figure 17 explicates the isometric view of the conical screen.
- Figure 19 provides for the schematic figure illustrating the filtration cycle during normal operation of the filter giving the position of the top T shaped pipe arm.
- Figure 20 provides for the schematic figure illustrating the backwash process elucidating the position of the T shaped pipe arm along with the bottom slurry drain arm.
- the integrated two-stage auto self-cleaning filtration device of the present invention is in a single housing wherein the inlet is sea water or any other low- viscosity, free flowing fluid containing organic and inorganic solids of varying, uncontrolled size ranges upto ⁇ , ⁇ ; and the output is the fluid containing solids no more than 30 ⁇ in the preferred embodiment of the present invention, though certain embodiments of the present disclosed invention could provide output fluid containing solids of no more than ⁇ in size.
- the device is intended to be built almost entirely using stainless steel or rust and corrosion-resistant material. The entire device is of bolted
- the device has a bottom chamber (21), a body (22) and a top chamber (23).
- the body is separated from the bottom chamber by a conical screen (3) bolted circumferentially to the top inside surface of the housing of the bottom chamber as well as to the floor of the bottom chamber.
- the bottom chamber (21) is substantially cylindrical in shape from the outside, and conical in shape from the inside (described in detail in next paragraph).
- the bottom chamber comprises of an inlet opening (1), a drain nozzle (2) of appropriate circumference in the floor of the bottom chamber that always remains open and a slurry drain (19) of appropriate diameter suitable to seal to the backwash slurry discharge arm.
- a substantially conical screen (3) placed at a sharp incline to the vertical; and bolted to the top inside surface of the bottom chamber circumferentially.
- This screen serves four purposes: it acts as the barrier that separates the first-stage filtration from the second; it also acts as the floor of the second stage; as the inner housing of the first stage; and as a filter element.
- the bottom chamber also contains a movable pipe arm
- the movable pipe arm (17) caps and completely stops the ingress of filtered fluid from the first stage into any one of the plurality of filtration modules (7) in the second stage filter of the device, from the bottom.
- the movable pipe arm (17) then becomes the discharge route for the slurry that is dislodged from each one of the plurality of cylindrical screens within that module during the backwash cycle.
- FIG. 7 and Fig 8 is the front view and the top cross sectional view of the intersection between the bottom chamber and the body.
- the annular seal member has a substantial circular shaped cross section confirming to the cross section of the open end of the bottom chamber (24) and is fixed securely by any convenient means such as push bearings. This is also the intersection between the body and the movable arm during backwash.
- the body (22) commences from the other side of the conical screen (3) featured in the bottom chamber.
- the body comprises of an even numbered plurality of filtration modules (6)(i.e., alternative embodiments of the device may have 4, 6, 8 filtration modules) such that pairs of filtration modules are placed diametrically opposite to each other.
- each filtration module comprises a plurality of surface filtration filter elements (7), and is substantially cylindrical in shape.
- Each module (6) is open at the bottom during filtration. All the filtration filter elements (7) in all the filtration module pairs are permanently closed at the bottom, and are permanently open at the top.
- the filter element is welded on to a flange at the top and supported by a cap affixed to a plate at the bottom.
- the cap at the bottom ensures a upward flow of the fluid during filtration in the 2 nd Stage.
- the body is integrated to the bottom chamber such that the filtrate output of the bottom chamber acts as the input of the body.
- the top chamber (23) acts as the receiver of all the filtrate that emerges from the top and interior of all the filter elements.
- the Top Chamber (23) comprises of a filtrate chamber (1 1) which collect all the filtrate after 2 nd stage filtration.
- the top chamber also comprises of a circumferentially placed outlet (12) that remains permanently opened for the filtrate to be removed.
- the top chamber also contains a T-shaped pipe arm (10) at the top, powered by a motor and gearbox (13) affixed to the top chamber by means of a stuffing box (14).
- a stuffing box 14
- the T- Shaped Arm (10) caps each pair of independent filtration modules (6) which are placed diametrically opposite to each other.
- the T-shaped pipe arm of the top chamber is connected to the moving arm present in the bottom chamber via a shaft (15).
- the T shaped pipe arm caps the diametrically opposing pair of filtration modules at the top and seals the same from any further filtrate entering the filtration module.
- the moving arm connects one of the pair of the filtration modules which is to be backwashed, by means of unique and effective sealing system.
- the moving arm(17) connects to the slurry drain (19) through the gland assembly (20) such that the opening of the gland assembly is slightly smaller than the slot opening at the bottom.
- the necessary sealing between the module and the moving arm is provided by a collar and a plate (25).
- the collar sits on the sealing plate and the gap between collar and the plate is less than the size of the suspended solid in the filtrate.
- the plate comprises of two rings which helps in the sealing of the T shaped pipe arm to the filtration module. The sealing is slightly less than the slot opening at the bottom.
- the conical screen (7) is comprised of substantially vertically placed triangular profile wires with the flat surface facing the inner side of the outer housing of the bottom chamber of the present disclosed invention, and the wedge- shaped two faces facing the inside of the body of the device.
- the substantially vertical orientation of the regularly spaced triangular wires, with the flat face of the wires tilted with a view to slightly blocking and changing the direction of flow of fluid that flows onto it, ensures that fluid is forced into the second stage.
- the sharp tilt to the vertical ensures that any solids remaining after the cyclone separation gets trapped and, in spite of being less dense than the fluid, eventually drop to the floor of the bottom chamber, to be evacuated eventually through the drain nozzle.
- this filter Using a conical screen can be called as genuinely self-cleaning, requiring no manual intervention at any stage to evacuate solids trapped.
- the conical screen serves three other functional purposes: It acts as the barrier that separates the 1 st stage filtration from the 2 nd stage; also acts as the inner housing of the first stage and integrates the 1 st stage and the 2 nd Stage by acting as the floor of the second stage.
- cylindrical filter elements are made of sintered woven wire mesh wrapped around, and structurally "supported by a cylinder made of stainless steel triangular wire profiles, with the wedge-shaped portion inside and the smooth, flat surface outside and in contact with the woven wire mesh;
- Each cylindrical filter element consists of:
- the core, or innermost, layer being constituted of a cylindrical screen comprised of triangular wire profiles, with the flat surface facing outside and the wedge shape facing inwards.
- the two faces of the spirally wound triangular wire form a slit which widens radially inwardly between adjacent, substantially parallel triangular wire portions; with the inward apex of said triangular wire being welded to the projecting portion of support rods at crossing points.
- These rods act as structural support and ensure that the accurate standard distance between adjacent spirals of the triangular wire profiles is maintained strictly at all times.
- the design (widening radially inwardly) gives an effect analogous to pinching the nozzle of a pipe, imparting higher pressure and velocity of the fluid as it exits the cylinder during a backwash.
- the cylindrical core is tightly covered on the outside by a sleeve of multi-layered sintered woven wire mesh.
- the wire mesh screen is not structurally strong, as it is made of very fine woven wire that is prone to both, medium migration and distortion. This mesh would be welded in place both, longitudinally and circumferentially, to the cylindrical welded wedge wire mesh screen, to provide excellent, even structural support and strength to the sintered mesh screen both, during filtration and backwash.
- the outer layer of the cylindrical filter screen referred to in the preceding paragraph comprises a plurality of layers of plain woven square wire mesh of varying fineness, sintered (ie, thermally bonded) together.
- the multi-layer mesh screen provides high permeability, minimal resistance and very high flow rate. Sintering ensures that the meshes in different layers' bond at every contact point; and hence reduces chances of migration of the medium. This helps to consistently maintain the micron rating of the each mesh layer, and hence makes for higher reliability of the filtration process.
- a protective mesh layer at the top is added, which gives the mesh slightly more structural strength.
- the multi-layered mesh also ensures that fibrous solids that would tend to choke a filter element made out of triangular wire alone would be filtered out.
- the advantage that a plurality of smaller diameter filter elements offers is much higher available surface area for filtration in the same volume of space occupied, as compared with one single, large diameter filter element. This is of great commercial value when the present disclosed invention is used as a component of a ballast water filtration system fitted on ocean-going ships, where on-board space is at a premium.
- the triangular wire profile When the triangular wire profile is manufactured by the above described method, it forms a perfect cylindrical candle, with the triangular wire rolled spirally, and with support rods welded at all contact points on the inside. This makes the candle perfectly suited to not only support the woven mesh sleeve with a smooth outer surface, but also makes it perfectly suited for the Out-to-In fluid flow design.
- the liquid sought to be filtered enters tangentially from a inlet pipe (1) located near the top of the bottom chamber.
- the tangential entry of the pumped fluid ensures that the fluid flows rapidly in circular motion, creating a vortex.
- the rapid flow of the fluid causes the denser solids to slow down and fall lower in the vortex until they drop to the floor of the bottom chamber.
- the floor of the bottom chamber (4) has a drain nozzle (2) of appropriate circumference at the bottom of the bottom chamber that remains open always.
- the solids that precipitate and fall to the bottom are pushed along around the floor of the chamber by some of the fluid that reaches the floor, till they slip out of the drain nozzle (2) along with some fluid.
- build-up of solids in the bottom chamber is contained, and auto-cleaning effect is achieved.
- the conical screen placed at a sharp incline to the vertical and bolted to the top inside surface of the bottom chamber circumferentially, serves two purposes: it acts as the barrier that separates the first-stage filtration from the second; and as the inner housing of the first stage.
- the conical screen (3) is comprised of triangular wires, with one of the flat faces substantially facing the inside of the bottom chamber, albeit with a slight incline such that when viewed in profile, adjacent triangular rods would appear to present a saw-tooth appearance. This arrangement forces the fluid that touches its surface, outwards and into the second stage (called the Coanda effect). When this happens, the gap in the triangular wires comprising the conical screen (3) stop the lighter solids from exiting the first stage. These solids are pushed circumferentially and slightly downwards by the fluid spinning in a vortex. Thus the solids notwithstanding the lower density, are pushed to exit through the drain nozzle (2).
- the two other faces of the vertical triangular wire portions form a slit which widens radially inwardly between adjacent triangular wire portions; with the inward apex of said triangular wire being welded to the projecting portion of support rods at crossing points.
- These rods that end up in a circular formation, act as structural support to the vertically placed triangular wire portions, and ensure that the accurate standard distance between successive vertical triangular rods is maintained strictly at all times.
- the filtrate of the 1 st stage filtration enters the body of the 2 nd stage filtration chamber (5).
- a plurality of pairs of independent filtration modules (6) each module being substantially cylindrical in shape, comprise the second stage of filtration where solids of particle size mostly between 300 ⁇ and 30 ⁇ in size (or as fine as ⁇ in certain embodiments of the present disclosed invention) are filtered out.
- Modules diametrically facing each other form a pair for the purposes of management of backwash.
- Multiple module pairs are arranged such that they appear substantially annular in arrangement.
- Each filtration module (6) is open at the bottom at all times except when it is undergoing backwash. This enables the filtrate emerging from the first stage to move upwards and onto the sides of multiple filter elements (7).
- the flow direction of the fluid in the second stage is Out-to-In during filtration and In-to-Out during backwash.
- Each filter element (7) is permanently closed at the bottom, and permanently open at the top, being welded on to a flange at the top that only permits filtrate pushing upwards from the inside of each candle, to reach the top chamber that is shared by all filter elements and modules. The filtrate then exits the top chamber from a cylindrical outlet that is permanently open, placed circumferentially near the top of the top chamber.
- yet another feature of this invention is that once ⁇ P is reached, the system does not shut down for cleaning but only a pair of the filtration modules is shut off at the top by means of a rotatable T shaped pipe arm (10) and a moving arm (17) connected to the filtration module (6) undergoing backwash at the bottom, which acts as a drain nozzle (19) and the remaining modules continue to process the filtrate with better output.
- the flow velocity of the filtrate increases as the entire volume of fluid available to be filtered is same but the number of filtration modules are less, it is ensure that the remaining filtration modules filter the fluid at an enhanced rate.
- the filtered output is even though gets reduced for few seconds due to the fact the filtrate from one of the module is used as a backwashing liquid for the filtration module undergoing backwash.
- the design of the filter element also contributes to the velocity of the backwash fluid as the pointed wedge surfaces act in accordance to the Venturi Effect.
- the slurry is drained through the drain nozzle of the moving arm and each filtration module is backwashed in a few seconds and the T shaped pipe arm moves onto the next filtration module at a pre-determined angle and rate.
- the T shaped pipe arm is placed , in between two adjacent modules when not in use. Self cleaning and zero downtime is achieved in this manner in the 2 nd stage also.
- the sintered sheets are generally welded to the triangular wedge wire and then bent.
- the triangular welded wedge wire is first manufactured in a cylindrical form & then "the sintered wire mesh is wrapped on the cylindrical element tightly & welded in the longitudinal & circumferential direction to give a compete sealing.
- This manner of manufacture enables the wire mesh to withstand migration and manufacturing of small diameter filter elements which are not only cost effective but also space effective in usage and directly result in low foot print size. .
- the unfiltered particles deposited on the filter element are back washed with filtrate water based on the ⁇ principle.
- the backwash cleaning is triggered by the differential pressure between the inlet and outlet port of the second stage and the backwash cleaning is done between diametrically opposing pairs of filtration modules within 3 to 4 seconds/module.
- the backwash process is completed with zero downtime and the filter is designed for continuous output at any point of time. When cleaning is taking place, it is only two of the filtration modules that are shut off and the remaining filtration modules continue to work with an increased flow of the fluid as compared to normal flow.
- the sealed filtration module at both ends which is undergoing backwash, results in more filtrate from the bottom chamber being available for the remaining filtration modules and thus level of the output gets reduced only partially, resulting in a continuous flow of the filtrate from the top chamber.
- the novel T-shaped pipe arm (10) present in the top chamber enables superior back wash by using the filtrate from one of the module as the backwash liquid for the opposite pair of filtration module.
- the T shaped pipe arm (10) that caps the tops of any pair of individual filtration modules (6) placed diametrically opposite each other moves at a pre determined rate in a predetermined angle.
- This movement is synchronised with the movement of the movable arm (17), such that the inward flow from the bottom for one of the modules of the duplex pair is stopped completely, and instead, the movable arm (17) acts as the backwash slurry discharge channel (19) for that module.
- one filtration module (6) in the duplex pair effectively becomes positioned to receive the filtered fluid output of the other module and due to the moving arm one end is opened to a atmospheric pressure through the drain nozzle free flow of back wash slurry takes place without any restriction
- the necessary sealing to prevent leakage during backwash is provided by the unique and effective system.
- the moving T shaped pipe arm at the top (10) and the moving arm at the bottom (17) are so arranged that by rotating them to the predetermined degree, it can ensure the backwash of all the filtration modules, by pairing each module of all the duplex pairs (6) constituting the main body (22) of the device in turn.
- the common chamber stops receiving filtered fluids from the pair of modules that are capped with the T shaped arm (10), but the remaining modules continue to discharge filtered fluid at a higher rate, into the common chamber (1 1) thereby providing a continuous output with zero downtime.
- the cumulative effective of the following three factors contribute to efficient backwash.
- the filter elements are made up of triangular wire with two inner faces of the spirally wound triangular wire profiles that support the filter element made of multi-layered sintered woven wire mesh.
- the wedge-shaped surfaces of the triangular wires form a slit which widens radially inwardly between adjacent triangular wire spirals; this creates an effect analogous to the effect of pinching the mouth/ nozzle of a garden hose, thus speeding up the backwash fluid just before it hits the inside of the multi-layered sintered woven wire mesh element, known as the Venturi effect.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IN3567MU2012 | 2012-12-20 | ||
PCT/IN2013/000777 WO2014097317A2 (en) | 2012-12-20 | 2013-12-18 | Integrated multiple-stage auto-self-cleaning filter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2948232A2 true EP2948232A2 (en) | 2015-12-02 |
EP2948232A4 EP2948232A4 (en) | 2016-11-02 |
Family
ID=50979344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13865722.6A Withdrawn EP2948232A4 (en) | 2012-12-20 | 2013-12-18 | Integrated multiple-stage auto-self-cleaning filter |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2948232A4 (en) |
WO (1) | WO2014097317A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3735309A1 (en) * | 2018-01-01 | 2020-11-11 | Srinivasan Ramachandran Puddukarai | Multi stage auto self cleaning filter |
CN115739802B (en) * | 2022-04-24 | 2023-06-09 | 广州益环再生资源科技股份有限公司 | Glass washs recycle equipment |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1437838A (en) * | 1965-06-11 | 1966-05-06 | Filter with automatic cleaning device for all fluids | |
US3318452A (en) * | 1966-02-01 | 1967-05-09 | Renard P Adams | Backwash means for an open ended multiple tube filter assembly |
US3703465A (en) * | 1970-12-14 | 1972-11-21 | Dover Corp | Filter with rotating backwash selector |
DE8306970U1 (en) * | 1983-03-08 | 1984-01-19 | Atlantik Gerätebau GmbH, 3570 Stadtallendorf | FULLY AUTOMATIC BACK RINSE FILTER |
RU2082484C1 (en) * | 1993-10-26 | 1997-06-27 | Шутков Евгений Алексеевич | Method of cleaning filter by countercurrent flow |
DE4340275C2 (en) * | 1993-11-26 | 1999-10-21 | Boll & Kirch Filter | Backwash filter |
US6663774B2 (en) * | 2000-10-16 | 2003-12-16 | Weatherford/Lamb, Inc. | Centrifuge screen |
WO2012060689A1 (en) * | 2010-11-03 | 2012-05-10 | Moon Tuck Mak | Water filtration apparatus with automatic backwash |
-
2013
- 2013-12-18 EP EP13865722.6A patent/EP2948232A4/en not_active Withdrawn
- 2013-12-18 WO PCT/IN2013/000777 patent/WO2014097317A2/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2014097317A2 (en) | 2014-06-26 |
WO2014097317A3 (en) | 2014-12-04 |
EP2948232A4 (en) | 2016-11-02 |
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