AU2018101253A4 - Multi-screen self-cleaning mechanism - Google Patents

Abstract

One aspect is a linear displacement equalizer for multi-screen self-cleaning filtration apparatuses that comprises autonomous turbines. Each autonomous turbine is hinged at a different pivoting arrangement. The linear displacement equalizer is configured to co-operate within a filtration mechanism that comprises a suction scanner. Each autonomous turbine is configured to match with a respective suction scanner and cause a respective rotation between a nozzle of the respective suction scanner and a screen. Another aspect is a multi-screen self cleaning mechanism comprising at least two parallelly oriented cylindrical screens, each of which comprises a respective suction scanner. Each suction scanner is coupled to a respective autonomous turbine that is configured to rotate the main tube about a common axis, whereby moving an intake opening of a nozzle of the suction scanner over the inner face of the cylindrical screen, whereby scanning the respective cylindrical screen rotationally during self cleaning operation of the mechanism. Fig. 1 28| 271 280c 280e 271 h ' 42_28 241 g 280c -- - - --- 241 h 3 9 1 -- - - - - - - - 280b 390p 244 273 41 h Fig. 2D 340 ,0 Jz 301 348 320b || 32 Fig. 3

Description

MULTI-SCREEN SELF-CLEANING MECHANISM

TECHNICAL FIELD

[0001] The present disclosure relates to the field of self-cleaning of filtration systems having multiple parallelly working screening elements in one filtration chamber.

BACKGROUND

[0002] One of the factors which determine the flow rate through a filter is the open-area of the filter. During the filtration process, the open-area tends to decrease gradually due to accumulation of screened dirt in pores of the filter media. Cleaning or replacement of the filter's screening system is therefore required whenever the open-area of the filter becomes smaller than a required minimum.

[0003] The difference between the initial open-area of a filter and between a minimal required open-area may thus determine the number of productive service hours of the filter before replacement or cleaning may be required.

[0004] One way to increase the initial open-area of a screen-based filter per a given size filtration chamber, is to include in the filtration chamber an array of parallelly working small screens with a total open-area greater than may be achieved through hypothetical use of a single large screen of similar structure.

[0005] It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0006] It is an object of the following disclosure in at least one preferred form to provide for efficient self-cleaning of arrays of parallelly working screens.

BRIEF SUMMARY

[0007] According to one aspect of the present invention, there is provided a linear displacement equalizer for multi-screen self-cleaning filtration apparatuses, said linear displacement equalizer comprising: a plurality of autonomous turbines; and a plurality of hinging arms, each of which connected to a pivoting arrangement at a distal end thereof, wherein each autonomous turbine of said plurality of autonomous turbines is hinged at a different pivoting arrangement; wherein said linear displacement equalizer is configured in size and shape to cooperate within a multi-screen self-cleaning filtration mechanism that comprises a plurality of suction scanners for performing a self-cleaning operation of a plurality of screens of the multiscreen self-cleaning filtration apparatus, wherein each of said plurality of autonomous turbines is configured to match with a respective suction scanner and cause a respective rotation between a nozzle of the respective suction scanner and a screen of the plurality of screens.

[0008] Optionally, said plurality of hinging arms are connected to and angularly spaced about a central post of said linear displacement equalizer.

[0009] Optionally, the linear displacement equalizer comprising a guide tip at a top end of said central post.

[0010] Optionally, the linear displacement equalizer of comprising a base plate having central upwardly extending protrusion, wherein said central post has an internal hollow constituting a tunnel, the tunnel being configured to loosely match the central protrusion of the base plate, whereby said displacement equalizer unit can freely move linearly with said tunnel sliding about the central protrusion irrespective of said base plate being immovably fixed in the multi-screen self-cleaning filtration apparatus.

[0011] Optionally, the linear displacement equalizer comprising a base plate having central downwardly extending tunnel, wherein said central post has a downwardly facing extension configured to loosely match the central tunnel of the base plate, whereby said displacement equalizer unit can freely move linearly with said downwardly facing extension sliding about the tunnel irrespective of said base plate being immovably fixed in the multi-screen self-cleaning filtration apparatus.

[0012] Optionally, the linear displacement equalizer comprising: a plurality of vertical tracks protruding upwardly from said base plate remotely from said central protrusion; and a plurality of stabilizing arms extending from and angularly spaced about said central post, whereby said plurality of vertical tracks serving as guiding means for said plurality of stabilizing arms.

[0013] Optionally, the linear displacement equalizer comprising a base plate and a spider-like top portion, wherein said spider-like top portion comprising said plurality of hinging arms.

[0014] According to another aspect of the present invention, there is provided a multi-screen self-cleaning mechanism, comprising: at least two parallelly oriented cylindrical screens, each of which comprises a respective suction scanner comprising: a main tube and at least one nozzle; wherein each cylindrical screen shares a longitudinal axis with the main tube of the respective cylindrical screen, wherein the at least one nozzle extending between the main tube and an inner face of the each cylindrical screen, wherein the at least one nozzle providing for liquid communication between the each cylindrical screen and an inner space of the main tube, wherein each suction scanner is coupled to a respective autonomous turbine that is configured to rotate the main tube about a common axis, whereby moving an intake opening of the at least one nozzle over the inner face of the cylindrical screen, whereby scanning the respective cylindrical screen rotationally during self-cleaning operation of the mechanism.

[0015] Optionally, the autonomous turbines are rotationally uncoupled one to another, whereby enabling each autonomous turbine to rotate at an individual angular velocity irrespective of angular velocity of other autonomous turbines.

[0016] Optionally, the main tubes of the suction scanners are configured to co-move linearly, during the self-cleaning operation of the mechanism, wherein each main tube moves in a direction along its longitudinal axis.

[0017] Optionally, said autonomous turbines are free to rotate the main tubes, each at an individual rotation velocity, while the suction scanners co-move linearly, thereby making the intake openings of the nozzles scan the inner faces of the respective cylindrical screens in individual helical paths, respectively.

[0018] Optionally, a coupling between the suction scanner and a respective autonomous turbine includes a fluid discharging outlet of the main tube opened individually into a central fluid receiving hollow of the autonomous turbine.

[0019] Optionally, each autonomous turbine comprises a plurality of fluid deflecting channels, wherein the plurality of fluid deflecting channels of the autonomous turbine diverge from the central fluid receiving hollow with respective end portions of the plurality of channels inclined in a first direction either coherently clockwise or coherently counterclockwise across radial lines outspreading from an axis of rotation of the turbine, such that upon fluid flow from the intake openings into the main tube, through the common fluid receiving hollow of the turbine, fluid becomes discharged from outlets of the fluid deflection channels in said first direction thereby driving the turbine to rotate in a second direction opposite the first.

[0020] Optionally, the autonomous turbines are coupled to a common linear displacement equalizer such that all turbines and suction scanners co-move linearly in correlation with linear motion of the linear displacement equalizer, regardless of the individual rotation velocities of the turbines.

[0021] Optionally, the linear displacement equalizer is coupled to a piston configured to control the extent and velocity of the linear displacement.

[0022] Optionally, the linear displacement equalizer comprises a plurality of motion guides configured to maintain linear motion of the equalizer and eliminate pivoting.

[0023] Optionally, the number of said at least two parallelly oriented cylindrical screens is five.

[0024] Optionally, the number of said at least two parallelly oriented cylindrical screens is three.

[0025] Optionally, said at least two parallelly oriented cylindrical screens include a central cylindrical screen and a plurality of cylindrical screens arranged with their longitudinal axes equidistant from a longitudinal axis of the central cylindrical screen.

[0026] Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”.

DESCRIPTION OF THE FIGURES

[0027] The present disclosed subject matter will be understood and appreciated more fully from the following detailed description taken in conjunction with the drawings in which corresponding or like numerals or characters indicate corresponding or like components. Unless indicated otherwise, the drawings provide exemplary embodiments or aspects of the disclosure and do not limit the scope of the disclosure. In the drawings: [0028] Fig. 1 illustrates a vertical cross section isometric view of an exemplary embodiment of a suction scanner for use in a multi-screen self-cleaning mechanism according to the presently disclosed subject matter.

[0029] Fig. 2A illustrates a half-section (quarter removal) isometric view of a filtration system with a multi-screen self-cleaning mechanism according to an embodiment of the presently disclosed subject matter, the self-cleaning mechanism is shown in initial position.

[0030] Fig. 2B illustrates the half-section (quarter removal) view of Fig. 2A, with the selfcleaning mechanism shown with a predetermined displacement from the initial position.

[0031] Fig. 2C illustrates the half-section (quarter removal) view of Fig. 2A, with the selfcleaning mechanism shown with a full way displacement from the initial position.

[0032] Fig. 2D illustrates an enlarged isometric view of a linear displacement equalizer unit according to the presently disclosed subject matter.

[0033] Fig. 3 illustrates a half-section (quarter removal) isometric view of another embodiment of a filtration system making use of the multi-screen self-cleaning mechanism according to the presently disclosed subject matter, the self-cleaning mechanism is shown in initial position.

DETAILED DESCRIPTION OF THE FIGURES

[0034] Fig. 1 illustrates in a cross section view, a suction scanner 100 for use in a multiscreen self-cleaning mechanism according to the presently disclosed subject matter. The cross section may be taken along the longitudinal axis 111 of the suction scanner. During the selfcleaning mode of operation of a filtration system comprising the mechanism, a plurality of suction scanners 100 may rotate each about its axis 111. The rotation may be driven by a turbine, such as turbine 280 in Fig. 2A (not shown), or any other mechanical arrangement configured to convert kinetic energy extracted from the flow of the drain fluid into rotation of the suction scanners 100. The turbine may be coupled to the suction scanner at the top end of a main tube 101 of the scanner. The main tube 101 may have grooves or slots 117 for facilitating and improving the coupling with the turbine. In some exemplary embodiments, fluid suctioned by the suction scanner 100 through its nozzles 102, may enter the inner space 101s of the main tube 101 of suction scanner 100. The fluid may be communicated to a top opening 108 of the main tube 101. From the top opening 108, the fluid may pass through the turbine, thrusting the turbine to rotate, thereby rotating the main tube 101.

[0035] In some exemplary embodiments, upon a rotation of the main tube 101 about the longitudinal axis 111, respective portions on the inner face of the cylindrical screen 220 (not shown) may be scanned by the intake openings 104 of the nozzles 102, suctioning the dirt accumulated on the screen by generating reverse flow through the screen.

[0036] In some exemplary embodiments, the scanning path followed by the intake openings 104 may become helical when the suction scanner 100 moves linearly in the direction of the axis 111 simultaneously with said rotation. The suction scanner may comprise an extended axis member 110 extending below a bottom end 101 b of the main tube 101. The extended axis member 110 can be situated through a ring-like hole of a bearing 210 located at a bottom end of the cylindrical screen 220. The extended axis member 110 may function in maintaining the rotational motion while being linearly displaced through the bearing.

[0037] Fig. 2A - 2C illustrate a half-section (quarter removal) view of a filtration system 299 with a multi-screen self-cleaning mechanism 250 according to an embodiment of the presently disclosed subject matter.

[0038] A suction scanner 200 is shown within a cylindrical screen element 220, both sharing a common longitudinal axis 211. The Cylindrical screen element 220 may comprise a support frame, e.g. a rigid cage-like (basket) framework (not shown) for reinforcing the screen element construction to a desired rigidity degree. In some exemplary embodiments, a porous medium having a hollow cylindrical contour constituting the cylindrical screen 220 may be deployed on an inner side of the framework.

[0039] In some exemplary embodiments, during filtering operation mode of the filtration system 299, the suction scanner 200 may be located in its lowermost position within the screen element 220, as illustrated by Fig. 1A. Likewise, additional suction scanners 200 situated in respective additional screen elements 220 may be located in their lowermost position. In this position, (e.g., the lowermost position) the extended axis member 210 of the main tube 201 may be full way downward through a ring-like hole formed through a ring-like bearing (being, for example, a support and guide for rotation or longitudinal displacement of the axis member 210), which is located near the bottom of the screen element 220. Situated in the lowermost position, a bottom end (like 101b in Fig. 1) of the main tube 201, may rest on top of the bearing 220b.

From this lowermost position the suction scanners 200 may begin to scan the inner faces of the respective cylindrical screens 220 once the filtration system 299 turns into self-cleaning mode of operation.

[0040] In the illustrated embodiment, the filtration system 299 comprises five parallel sets of cylindrical screens 220, of which four are shown (the one to the right in cross section) and the fifth is included in the cut-off section which was removed for uncovering the inside of the filtration chamber 230. Additionally or alternatively, the filtration system 299 may comprise a different number of parallel sets of cylindrical screens 220, such as three, four, seven, or the like.

[0041] In some exemplary embodiments, the filtration chamber 230 may have a main fluid inlet 231 (through which fluid to be filtered is supplied from a main line), and a main fluid outlet 232 through which filtered fluid exits the system. A coarse screen 227 may be provided respectively between the main fluid inlet 231 and each of the cylindrical screens 220. Internal wall 229 may divide the filtration chamber 230 from the inlet compartment in which the coarse screens 227 are situated, such that fluid communication between the fluid inlet 231 and the fluid outlet 232 is only across the screens 220. The wall 229 may be contoured for supporting and holding the screens 220 and the coarse screens 227 in predetermined positions within the filtration chamber.

[0042] In some exemplary embodiments (especially useful when a filtration system operates under a very low liquid supply pressure), when the filtration system 299 turns to a self-cleaning mode, the fluid inlet may become fully or partially closed (such as by an external valve, not shown) and a dirt evacuation port 260 (only a portion of which is shown due to removal of its remaining structure as a part of the removed quarter image), may be opened to a drain, thereby decreasing the fluid pressure in the flush merger compartment 240 to a pressure value satisfactorily below the pressure value of the clean fluid in the outer side of the cylindrical screens. This pressure differentiation may generate efficient backflows through the screens 220 (even when working under a low liquid supply pressure), i.e. from the clean-fluid side of the screens into the flush-fluid combining compartment 240, thereby back-flushing the screens 220 through the suction scanners.

[0043] In some exemplary embodiments, direct fluid flow from the filtration chamber 230 to the flush merger compartment 240 may be disabled by a base plate 241 separating therebetween. In various embodiments of the disclosed subject matter, the flush-fluid combining compartment may be separable from the filtration chamber, e.g. for maintenance purposes. The base plate may be mounted immovably within a circumferential groove 247 formed in the separation region between the compartment 240 and the chamber 230. The compartment 240, the chamber 230, and the base plate 241, may be secured together by a clamp and a respective clamping bolt. The clamp may by secured to, and hold together, the external ring-like protrusions 248. The base plate 241 may serve also as a top cover for the cylindrical screen elements 220.

[0044] In some exemplary embodiments, fluid communication between the clean fluid in the outer side of the cylindrical screens 220 and the flush merger compartment 240 may thus be enabled only in the self-cleaning path.

[0045] The self-cleaning path may start with clean fluid suctioned into the suction scanners through the screens 230 while removing dirt off the screen into the nozzles 202 of the suction scanners. The fluid then may exit from fluid outlets of the suction scanners into fluid deflecting channels (annotated 280c in Fig. 2D) formed in the turbines 280, which fluid outlets thereof are opened to the flush merger compartment 240.

[0046] By flowing through the turbines, the fluid flows may generate respective rotational thrusts which rotate the turbines and the suction scanners, with the nozzles 202 thereby scanning the inner surfaces of the screens 220 rotationally.

[0047] Advantageously, rotation of each turbine 280 may be independent of rotation of the other turbines. This is since each turbine is autonomous, i.e. ungeared to the other turbines. In some exemplary embodiments, each turbine may be freely hinged to a respective arm 271 of a common spider-like linear displacement equalizer 270. In such a configuration, each turbine is autonomous and thus can rotate at an individual speed.

[0048] In some exemplary embodiments, the hinging arms 271 may be connected to and angularly spaced about a central post 272 of the linear displacement equalizer 270. The central post 272 may be coupled to a stem 290s of a common piston 290p which is movable through a cylinder 291. During the filtering mode of operation, fluid may be maintained in the cylinder 291 (the fluid may be supplied through a command line (not illustrated) connected to a command-port 294 in the top end of the cylinder). The fluid maintained in the cylinder 291 disables the turbines and the suction scanners 200 from leaving the initial linear position shown by Fig. 1A during the filtering mode of operation.

[0049] In some exemplary embodiments, for linear displacement of the suction scanners 200 along the respective longitudinal axes 211, the pressure in the command line may be lowered way below the fluid pressure inside the suction scanners 201, such that the pressure differentiation over the turbines 280 suffices for pressing the linear displacement equalizer 270 against the stem 290s of the piston, thereby pushing the piston 290p into the cylinder 291, with the suction scanners comoving linearly each along its longitudinal axis 211, and simultaneously rotating according to the rotation of the respective turbines 280.

[0050] Fig. 2B illustrates the self-cleaning mechanism with a predetermined linear displacement from the initial position, the displacement shown was arbitrarily selected as an example of some partial linear displacement. The extended axis 210 of the suction scanner 201 may be partially withdrawn from the ring-like bearing 220b, correspondingly to the amount of linear displacement.

[0051] Fig. 2C illustrates the self-cleaning mechanism with a full way displacement from the initial position. The extended axis 210 of the suction scanner 201 may be nearly fully withdrawn from the ring-like bearing 220b.

[0052] Fig. 2D illustrates enlarged isometric view of a linear displacement equalizer 270 according to the presently disclosed subject matter. The linear displacement equalizer 270 may comprise a central post 272. The central post 272 may be couplable to a stem (annotated 290s in Fig. 2A) of a common piston (290p), through the coupling guide tip 275 located at the top end of the central post. A plurality of hinging arms 271 may be connected to and angularly spaced about the central post 272. A respective plurality of turbines 280 may be hinged each near a distal end of the respective arm 271 by means of a pivoting arrangement 271 h. The pivoting arrangement may comprise a pivot pin protruding from either the turbine or from the hinging arm and constituting an axis of rotation of the turbine, and a matching pivot hole or bore formed in the part facing the pin and constituting an axis bearing. In various embodiments of the disclosed subject matter the pivoting pin protrudes from the hinging arm downwardly into a pivot bore formed in the center of the turbine. In other various embodiments the pivoting pin protrudes upwardly from the center of the turbine top into a pivot bore formed in the bottom of the hinging arm. In various embodiments of the disclosed subject matter, the pin and the pivot bore comprise mutual snap connection configured to allow for free respective rotation between the pin and the bore while disabling unintentional removal of the pin from the bore. In other various embodiments of the disclosed subject matter the pin and the pivot bore are freely separable.

[0053] In some exemplary embodiments, the central post 272 may have an internal hollow constituting a tunnel, the tunnel being configured to loosely match a central protrusion 242 extending upwardly from the base plate 241. Thus, while the base plate 241 is immovably fixed in the filtration system 299, e.g. with its circumference affixed within the circumferential groove 247 (see Fig. 2A), e.g. by a clamp holding together the external ring-like protrusions 248, the displacement equalizer unit 270 can freely move linearly with the tunnel shifted about the central protrusion (as a function of the fluid pressures in the filtration system). The linear motion of the displacement equalizer unit 270 may be further stabilized by a guiding arrangement configured to disable the displacement equalizer unit 270 from angular deviation (pivoting) and to allow it to move only linearly. In the illustrated embodiment the guiding arrangement configuration for disabling angular deviation, includes a plurality of vertical tracks 244 protruding upwardly from the base plate remotely from the central protrusion 242. The vertical tracks 244 may serve a guiding means for a respective plurality of stabilizing arms 273, which extend from and are angularly space about the central post 272, with equal angular gaps from the hinging arms 271.

[0054] In some exemplary embodiments, the central post 272 may have a downwardly oriented extension, loosely matching into a central downwardly oriented tunnel formed in the base plate.

[0055] Thus, while the base plate is immovably fixed in the filtration system 299, e.g. affixed within the circumferential groove 247 (see Fig. 2A), the displacement equalizer unit 270 can freely move linearly with the downwardly facing extension being shifted within the tunnel (as a function of the fluid pressures in the filtration system).

[0056] In some exemplary embodiments, the base plate 241 may further be comprising through holes 241 h each matching both in position and in internal diameter the position and the external diameter of a respective main tube 201 of a suction scanner 202. The suction scanners can thus freely move linearly along their longitudinal axes 211 through the holes 241 h, upwardly and downwardly to a predetermine extent, as a function of the fluid pressures in the filtration system 299. The holes 241 h may fit the main tubes 201 to allow linear motion of the tubes trough the holes, as well as rotation of the tubes (upon turbine rotation), while eliminating (or substantially minimizing) fluid passage. The holes 241 h may be provided with ring gaskets for optimization of said fit. The main tubes of the suction scanners may be dimensioned lengthwise such that when the displacement equalizer unit 270 is in its initial position within the flush-fluid merger compartment 240 as shown in Fig. 2A, top portions of the main tubes 201 extend, respectively, through the holes 241 h, and may be coupled each to a bottom tube segment 280b of a respective turbine 280. The bottom tube segment 280b may have at least one protrusion configured to engage into respective groove (see groove 117 of Fig. 1) at or near the top end of the respective suction scanner.

[0057] In various embodiments of the disclosed subject matter the main tubes 201 of the suction scanners 200 may have a uniform predetermined external diameter in top portions thereof all along the longitudinal tube extent intended to move through the holes 241 h (such portions are also free of nozzles 202). Portions of the main tube underneath said extent may have different (either predetermined or varying) external diameters and may comprise one or more nozzles 202.

[0058] Fig. 3 illustrates a half-section (quarter removal) isometric view of another embodiment of filtration system making use of the multi-screen self-cleaning mechanism 350 according to the presently disclosed subject matter, the self-cleaning mechanism is shown in initial position, with the axis 310 of the main tube 301 fully inserted through the bearing 320b. The filtration system 399 may differ from the filtration system 299 in that the main outlet 332 is oriented in right angle to the wall of the filtration chamber 330. The filtration system 399 may thus suit for a larger flow rate main line and can be designed with a flat bottom . The flat bottom may be used for supporting the system on a horizontal concrete basis.

[0059] In some exemplary embodiments, upstream and downstream main line segments may approach the filtration system 399 from the same direction when the main inlet 331 and the main outlet 332 are positioned as illustrated. The system, however, may flexibly be adapted to upstream and downstream main line segments approaching from different directions, by simply loosening the inlet-unit clamp (not illustrated, which is mounted on, and secures together, the ring-like protrusions 348), pivoting the inlet 331 to the desired direction, and re-securing the clamp.

[0060] Additionally or alternatively, other parts of the filtration systems, e.g. the self-cleaning mechanism 350, the contoured internal wall 329, the flush-fluid merger compartment 340, the cylinder 391 and the piston 390p, may correspond to equivalent items annotated 250, 229, 240, 291 and 290p, respectively, in the embodiment illustrated by Fig. 2A - 2D.

[0061] It is therefore can be appreciated that the self-cleaning mechanism 250 may easily be adapted to filtration systems differing in size design and capacity, without departing from the scope of the disclosed subject matter.

[0062] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosed subject matter. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

[0063] The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present disclosed subject matter has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the disclosed subject matter in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the disclosed subject matter. The embodiment was chosen and described in order to best explain the principles of the disclosed subject matter and the practical application, and to enable others of ordinary skill in the art to understand the disclosed subject matter for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (19)

1. A linear displacement equalizer for multi-screen self-cleaning filtration apparatuses, said linear displacement equalizer comprising: a plurality of autonomous turbines; and a plurality of hinging arms, each of which connected to a pivoting arrangement at a distal end thereof, wherein each autonomous turbine of said plurality of autonomous turbines is hinged at a different pivoting arrangement; wherein said linear displacement equalizer is configured in size and shape to cooperate within a multi-screen self-cleaning filtration mechanism that comprises a plurality of suction scanners for performing a self-cleaning operation of a plurality of screens of the multiscreen self-cleaning filtration apparatus, wherein each of said plurality of autonomous turbines is configured to match with a respective suction scanner and cause a respective rotation between a nozzle of the respective suction scanner and a screen of the plurality of screens.

2. The linear displacement equalizer of Claim 1, wherein said plurality of hinging arms are connected to and angularly spaced about a central post of said linear displacement equalizer.

3. The linear displacement equalizer of Claim 2 comprising a guide tip at a top end of said central post.

4. The linear displacement equalizer of Claim 2, further comprising a base plate having central upwardly extending protrusion, wherein said central post has an internal hollow constituting a tunnel, the tunnel being configured to loosely match the central protrusion of the base plate, whereby said displacement equalizer unit can freely move linearly with said tunnel sliding about the central protrusion irrespective of said base plate being immovably fixed in the multi-screen self-cleaning filtration apparatus.

5. The linear displacement equalizer of Claim 2, further comprising a base plate having central downwardly extending tunnel, wherein said central post has a downwardly facing extension configured to loosely match the central tunnel of the base plate, whereby said displacement equalizer unit can freely move linearly with said downwardly facing extension sliding about the tunnel irrespective of said base plate being immovably fixed in the multi-screen self-cleaning filtration apparatus.

6. The linear displacement equalizer of Claim 2 further comprising: a plurality of vertical tracks protruding upwardly from said base plate remotely from said central protrusion; a plurality of stabilizing arms extending from and angularly spaced about said central post, whereby said plurality of vertical tracks serving as guiding means for said plurality of stabilizing arms.

7. The linear displacement equalizer of Claim 1 comprising a base plate and a spiderlike top portion, wherein said spider-like top portion comprising said plurality of hinging arms.

8. A multi-screen self-cleaning mechanism, comprising: at least two parallelly oriented cylindrical screens, each of which comprises a respective suction scanner comprising: a main tube and at least one nozzle; wherein each cylindrical screen shares a longitudinal axis with the main tube of the respective cylindrical screen, wherein the at least one nozzle extending between the main tube and an inner face of the each cylindrical screen, wherein the at least one nozzle providing for liquid communication between the each cylindrical screen and an inner space of the main tube, wherein each suction scanner is coupled to a respective autonomous turbine that is configured to rotate the main tube about a common axis, whereby moving an intake opening of the at least one nozzle over the inner face of the cylindrical screen, whereby scanning the respective cylindrical screen rotationally during self-cleaning operation of the mechanism.

9. The multi-screen self-cleaning mechanism according to claim 8, wherein the autonomous turbines are rotationally uncoupled one to another, whereby enabling each autonomous turbine to rotate at an individual angular velocity irrespective of angular velocity of other autonomous turbines.

10. The multi-screen self-cleaning mechanism according to claim 8, wherein the main tubes of the suction scanners are configured to co-move linearly, during the self-cleaning operation of the mechanism, wherein each main tube moves in a direction along its longitudinal axis.

11. The multi-screen self-cleaning mechanism according to claim 10, wherein said autonomous turbines are free to rotate the main tubes, each at an individual rotation velocity, while the suction scanners co-move linearly, thereby making the intake openings of the nozzles scan the inner faces of the respective cylindrical screens in individual helical paths, respectively.

12. The multi-screen self-cleaning mechanism according to claim 8, wherein a coupling between the suction scanner and a respective autonomous turbine includes a fluid discharging outlet of the main tube opened individually into a central fluid receiving hollow of the autonomous turbine.

13. The multi-screen self-cleaning mechanism according to claim 12, wherein each autonomous turbine comprises a plurality of fluid deflecting channels, wherein the plurality of fluid deflecting channels of the autonomous turbine diverge from the central fluid receiving hollow with respective end portions of the plurality of channels inclined in a first direction either coherently clockwise or coherently counterclockwise across radial lines outspreading from an axis of rotation of the turbine, such that upon fluid flow from the intake openings into the main tube, through the common fluid receiving hollow of the turbine, fluid becomes discharged from outlets of the fluid deflection channels in said first direction thereby driving the turbine to rotate in a second direction opposite the first.

14. The multi-screen self-cleaning mechanism according to claim 8, wherein the autonomous turbines are coupled to a common linear displacement equalizer such that all turbines and suction scanners co-move linearly in correlation with linear motion of the linear displacement equalizer, regardless of the individual rotation velocities of the turbines.

15. The multi-screen self-cleaning mechanism according to claim 14, wherein the linear displacement equalizer is coupled to a piston configured to control the extent and velocity of the linear displacement.

16. The multi-screen self-cleaning mechanism according to claim 14, wherein the linear displacement equalizer comprises a plurality of motion guides configured to maintain linear motion of the equalizer and eliminate pivoting.

17. The multi-screen self-cleaning mechanism according to claim 8, wherein the number of said at least two parallelly oriented cylindrical screens is five.

18. The multi-screen self-cleaning mechanism according to claim 8, wherein the number of said at least two parallelly oriented cylindrical screens is three.

19. The multi-screen self-cleaning mechanism according to claim 8, wherein said at least two parallelly oriented cylindrical screens include a central cylindrical screen and a plurality of cylindrical screens arranged with their longitudinal axes equidistant from a longitudinal axis of the central cylindrical screen.