US20020092814A1 - Filtering apparatus and method for washing its filtering elements - Google Patents
Filtering apparatus and method for washing its filtering elements Download PDFInfo
- Publication number
- US20020092814A1 US20020092814A1 US10/090,512 US9051202A US2002092814A1 US 20020092814 A1 US20020092814 A1 US 20020092814A1 US 9051202 A US9051202 A US 9051202A US 2002092814 A1 US2002092814 A1 US 2002092814A1
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- Prior art keywords
- washing
- flow
- pressure
- organ
- axle
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- 238000005406 washing Methods 0.000 title claims abstract description 86
- 238000001914 filtration Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 13
- 210000000056 organ Anatomy 0.000 claims abstract description 57
- 230000033001 locomotion Effects 0.000 claims abstract description 47
- 230000008878 coupling Effects 0.000 claims description 24
- 238000010168 coupling process Methods 0.000 claims description 24
- 238000005859 coupling reaction Methods 0.000 claims description 24
- 230000008595 infiltration Effects 0.000 claims description 5
- 238000001764 infiltration Methods 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- 230000001846 repelling effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
-
- 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
- B01D29/11—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
- B01D29/117—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 arranged for outward 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
- B01D29/66—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
-
- 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
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- 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
- B01D2201/043—Filter tubes connected to plates
- B01D2201/0453—Filter tubes connected to plates positioned between at least two plates
Definitions
- the invention relates to a filtering apparatus, comprising an inlet channel for the flow to be filtered, an outlet channel for the filtered flow, a number of parallel filtering elements, into which the flow to be filtered may be directed so that the infiltration occurs out of the element through the element jacket, and at least one rotating washing organ connecting alternately to different elements for forming an outlet channel for the backflushing of elements generated with the pressure of the filtered flow. Further, the invention relates to a method for washing the filtering elements of the apparatus.
- a filtering device is needed especially in motors as a fuel or luboil filter, with the continuous backflushing of which the operation of the motor is ensured in long-term continuous use.
- the apparatus typically comprises a large number of filtering elements, the main part of which is continuously in operation while the washing is conducted in one or several elements at a time, depending on the number of washing arms.
- a state-of-the art backflushable filtering apparatus has been described in the patent publication DE-4 340 275.
- the apparatus comprises parallel, candle-shaped filtering elements arranged around a vertical axle as two nested rings.
- the flow to be filtered is directed into the elements from their upper and lower ends, and the infiltration occurs out of the element through the cylindrical jacket of each element.
- a washing organ consisting of two washing arms of different lengths is arranged below them, the arms being fastened to the rotatable vertical axle of the apparatus.
- the washing arms are arranged to alternately connect to the lower ends of different filtering elements so that they form outlet channels for the washing flow.
- closers are attached to the rotating axle of the apparatus above the filtering elements, the closers closing the upper end of the filtering element in question for the duration of the washing stage, thus preventing the flow to be filtered from mixing with the washing flow.
- the drawback of the solution in the publication DE-4 340 275 is that the rotation of the washing arms is dependent on the flow rate of the flow to be filtered coming into the apparatus, which may vary. If the flow rate is too high, it makes the washing arms to rotate too fast, and the washing periods of the filtering elements remain too short; and again, if the flow rate is too low, the washing arms rotate too slowly from one element to the other, or they stop altogether, if the decelerated flow cannot rotate the turbine rotor any more. The rotation of the washing arms is hindered by the rotor and the transmission mechanism getting dirty, and due to the structure of the apparatus, it is difficult to service the mechanism.
- the object of the invention is to provide a solution, in which the axle of the apparatus and one or several washing organs are rotated by utilising the flow pressure present in the apparatus so that the drawbacks associated with the state-of-the art technology can be avoided. It is characteristic of the filtering apparatus of the invention that a freewheel clutch is connected to the rotating axle of the washing organ, which converts the reciprocating motion generated by the pressure of the flow present in the apparatus and by the lower pressure alternating with it into a continuously parallel, stepping rotary motion of the washing organ.
- the rotation of the washing organ and the washing periods in different filtering elements are generated with a pressure difference, which it is possible to keep substantially constant, or which varies less than the flow rate of the flow coming into the apparatus. This ensures that the sufficiently long washing periods are repeated with a suitable frequency in all filtering elements of the apparatus.
- a substantial advantage of a second solution of the invention is that the freewheel clutch may be arranged outside the filtering room of the apparatus, connected to the rotating axle, so that it is easy to service the freewheel clutch and other organs maintaining the rotating movement, and the service may be carried out while the filtering continues.
- the freewheel clutch may consist of an actuator driving the rotating axle of the washing organ, which is alternately in sliding contact with the axle and which alternately locks into it so that the axle rotates along with the organ.
- the movement of the actuator may be generated, for example, by articulating it to a piston reciprocating on the alternating pressure.
- the pressure of the filtered flow is especially advantageously used for rotating the washing organ, by arranging the said flow to influence the said piston or another organ driving the freewheel clutch.
- the filtered flow is pure, so that it contaminates the rotating mechanism substantially less than an unfiltered flow.
- the apparatus of the invention preferably comprises channels and related control valves for connecting the pressure of the filtered flow and the lower counterpressure alternately to different sides of the piston.
- the lower pressure opposite the said pressure of the filtered flow may be the pressure prevailing in the outlet channel for the washing flow of the apparatus, to which the piston or another actuator may be connected.
- the outlet channel is generally in the atmospheric pressure prevailing in the surroundings.
- the solution of the invention makes it possible to hydraulically adjust the rotating movement of the washing organ so that the frequency and duration of the washing periods may be controlled with it.
- the movement of the washing organ may thus be damped, or it may be stopped exactly at the place of the element to be washed, in which the washing organ remains for a desired time before the movement continues.
- the filtering elements are washed in the filtering apparatus, comprising an inlet channel for the flow to be filtered, an outlet channel for the filtered flow, and a number of parallel filtering elements, into which the flow to be filtered is directed so that the infiltration occurs out of the element through the element jacket.
- the washing is achieved by coupling alternately different filtering elements to the rotary washing organ so that the washing occurs as backflushing directed to the washing organ with the pressure of the filtered flow.
- Essential in the method is that the rotating axle of the washing organ is rotated continuously in the same direction in a stepping manner using a mechanism, the reciprocating movement of which is generated with the pressure of the flow in the apparatus and with the lower pressure alternating with this.
- the former pressure is advantageously the pressure of the clean flow filtered in the apparatus, and the lower pressure is the ambient pressure present in the washing arm.
- the steps of the washing organ may be generated with a freewheel clutch, comprising an organ driving the rotating axle of the washing organ, which is alternately in sliding contact with the axle and which alternately locks into it for rotating the axle, the said organ being moved with a piston articulated with it, the piston being reciprocated by coupling the said pressures of different sizes alternately to its different sides.
- FIG. 1 is a vertical section of a filtering apparatus of the invention
- FIG. 2 is a horizontal section II-II of FIG. 1, in which the parallel filtering elements of the apparatus and the washing organs above them are shown;
- FIG. 3 shows the freewheel clutch and control valves connected to it for rotating the axle of the apparatus in the one extreme position of the coupling movement, as a section III-III of FIG. 1;
- FIG. 4 is a similar view to FIG. 3, presenting the freewheel clutch in its other extreme position;
- FIG. 5 shows the freewheel clutch of a second embodiment of the invention, with the related control valve, the coupling movement being in the other extreme position;
- FIG. 6 shows the freewheel clutch of FIG. 5 in the middle position between the extreme positions of its movement
- FIG. 7 is a vertical section of the coupling apparatus of FIGS. 5 and 6.
- FIGS. 1 and 2 there is shown a filtering apparatus, which may work, for example, as the luboil filter of a diesel motor, continuously filtering oil as the motor is running.
- the apparatus comprises a jacket 1 , an inlet channel 2 for the flow to be filtered, an outlet channel 3 for the filtered flow, and a number of longitudinal, candle-shaped filtering elements 5 arranged as two nested rings around the middle axis 4 of the apparatus.
- the jackets of the elements 5 are made of porous filtering material, which retains the solid particles or other impurities in the flow as the flow extends from the interior of the elements through the jacket and out of the elements.
- each element is open both from its upper end 6 and lower end 7 .
- the spaces between the ends 6 , 7 of adjacent filtering elements are closed with a horizontal plate 8 , 9 both at the lower and the upper end of the elements.
- the plates 8 , 9 are further connected to each other with a vertical, cylindrical wall 10 , which confines in its interior a vertical flow channel 11 for the flow to be filtered.
- the flow can spread into the space restricted by the jacket 1 , from where it is transferred into the elements through the open ends 6 , 7 of the filtering elements 5 , extends through the element jackets out of the elements and is discharged as purified into the outlet channel 3 .
- each of the candle-shaped filtering elements 5 is divided in two by a horizontal, solid partition 12 .
- Each element 5 thus comprises an upper part 13 open from its upper end and a lower part 14 open from its lower end, through which the flows to be filtered travel independent from each other.
- the apparatus is provided with backflushing, which is conducted with the pressure of the filtered flow in the direction opposite to the flow to be filtered through the element jackets, i.e. from the outside of the jackets into them.
- washing organs 15 connecting alternately to different ends 6 , 7 of the elements are arranged for coupling the elements to the lower pressure for generating the washing flow. Both washing organs consist of two washing arms 15 , the lengths of which are equal to the radii of the nested rings formed by the elements.
- the washing arms are made of a hollow tube, and they are fastened to the likewise hollow middle axle 4 of the apparatus so that together they work as discharge channels 16 for the washing flow cleaning the element.
- the discharge channels 16 are directed to the lower part of the apparatus, from where the washing flow is suitably discharged, for example, to the discharge assembly 18 in atmospheric pressure, after having passed through the filter 17 .
- the backflushing works so that the axle 4 with the washing arms 15 fastened to it performs a rotating movement counter clockwise so that the washing arms connect from their ends alternately to the ends 6 , 7 of different filtering elements 5 , thus coupling the interiors of these elements to a pressure which is lower than the pressure of the filtered flow in the discharge channels 16 and the discharge assembly 18 , thus generating the backflushing.
- the washing occurs in the part between the end of the element 5 and the partition 12 at the same time as the opposite end of the element is open so that the filtering may continue in the part restricting to the said open end of the element.
- the rotating movement of the construction consisting of the axle 4 belonging to the apparatus and of the washing arms 15 rigidly attached to the axle is generated with a mechanism, the structure and operation of which may be seen in FIGS. 3 and 4.
- the rotating mechanism is arranged into the casing 19 above the filtering space defined by the jacket 1 of the apparatus, the end 20 of the axle 4 of the apparatus extending into this casing.
- the axle 20 is driven by a freewheel clutch, which comprises an organ 21 annularly circulating the axle and moving in a reciprocating manner in accordance with FIGS. 3 and 4 so that it is alternately in sliding contact with the axle and that it alternately locks into the axle for rotating the axle along with the organ, depending on the direction of the movement.
- Such coupling arrangements which may be based, for example, on an inclined, flexible or yielding cogging, are known as such.
- the organ 21 thus slides from the position according to FIG. 3 to the position according to FIG. 4 on the axle 20 , which remains stationary, but as the organ returns back to the position in FIG. 3, it locks into the axle rotating it along one step counter clockwise.
- the axle 20 steps counter clockwise, rotating the washing arms 15 (FIGS. 1 and 2) so that they alternately connect different filtering elements 5 to the washing stage.
- the annular organ 21 circulating the axle 20 is provided with two protruding arms 22 , 23 arranged opposite each other, the one arm 22 being articulated to the piston 25 moving in the cylinder 24 .
- the piston 25 is moved in the cylinder 24 back and forth utilising the higher pressure of the filtered flow present in the filtering room of the apparatus and the lower pressure of the washing channels 16 , by connecting these to the cylinder alternately in different sides of the piston. From the side of the filtered flow, the filtering room is in contact with the casing 19 containing the freewheel clutch through the channel 26 (FIG. 1) so that the casing is filled with the filtered substance, such as lubricating oil.
- a connection is built from the casing 19 to the flushing channels 16 through the channel 27 .
- the piston 25 is controlled with the main valve 28 and two control valves 29 , 30 controlling it.
- the main valve 28 is connected to the cylinder 24 at different sides of the piston 25 driving the freewheel clutch using the tubes 31 , 32 .
- the leftmost control valve 29 is connected to the front end of the main valve 28 with the tube 33
- the rightmost control valve 30 is connected to the back end of the main valve with the tube 34 .
- the main valve 28 and the control valves 29 , 30 are connected to the said channel 27 in the lower pressure with the tubes 35 , 36 , 37 , 38 .
- the arm 23 of the actuator 21 has pressed the piston 39 inside the leftmost control valve 29 against the spring into a position in which it releases the higher pressure in the casing 19 from the assembly 40 into the tube 33 and from there to the front end of the main valve 28 , in which it has pushed the piston of the main valve to a position in which the pressure in the casing 19 has connected from the assembly 42 to the tube 31 , which connects the pressure with the cylinder 24 to the right side of the piston 25 driving the freewheel clutch.
- the back end of the main valve 28 is connected to the lower pressure in the channel 27 through the tube 34 , the right control valve 30 and the tube 38 .
- the movement of the piston 41 of the main valve 28 connects the cylinder 24 to the said lower pressure from the left side of the piston 25 through the tube 32 , the main valve and the tube 35 .
- the duration of the washing periods may be adjusted by stopping the washing arm 15 at the place of the element 5 to be washed for a desired period.
- the adjustment may be achieved, for example, with flow controller valves (not shown) installed into the tubes 31 and 32 , which slow down the reverse stroke of the piston 25 of the cylinder 24 , so that the arm 15 stays stationary during the movement in question.
- Alternative ways for adjusting the rotating movement of the arm 15 may include the adjustment of the pressure prevailing in the casing by choking the flow going into or out from the cylinder 24 in the channels 26 and 27 with a valve or valves placed in the channel 26 .
- FIGS. 5 - 7 show an alternative control arrangement for the freewheel clutch for rotating the axle 20 and the washing arms of the filtering apparatus.
- the structure in FIGS. 5 - 7 corresponds to that shown above in connection of FIGS. 3 and 4, and therefore, they are not explained in more detail here.
- valve 28 which corresponds to the main valve 28 in FIGS. 3 and 4, forms the only control valve of the system.
- FIG. 5 shows the position of the ring 21 and the left arm 44 , in which the arm has pushed the piston of the valve 28 into the extreme right position of the piston.
- the piston of the cylinder 24 has rotated the ring 21 counter clockwise by pushing the arm 22 to the half-way of the movement, in which the arms 44 , 45 driving the valve 28 are both detached from the ends of the valve.
- the right arm 45 pushes the piston of the valve 28 to the position extremely in the left, so that the pressures in different sides of the piston of the cylinder 24 switch places and start the reverse stroke of the piston and the rotation of the ring 21 clockwise back into the position according to FIG. 5.
- the freewheel clutch controlled with the pressure difference has the problem that if the pressure difference is small and/or if there is friction in the moving parts of the mechanism, it easily occurs that the piston of the cylinder 24 begins to move but it does not have enough strength to complete the movement, but it stops without achieving the rotation of the axle 20 . It may also happen that the strength of the arm 44 , 45 is not sufficient to move the piston of the valve 28 , which is the condition for the continuance of operation of the apparatus.
- the coupling comprises a separate coupling ring 47 provided with the crank arm 46 of its own, which is also pivoted to rotate the axle 20 .
- the arms 44 , 45 moving the piston of the valve 28 are attached to the latter ring 47 .
- the rotation of the arm 46 and the coupling ring 47 is achieved with the help of magnets in the arm installed stationarily in relation to the casing 19 .
- the end 46 of the arm is provided with a magnet 48 , which is attracted by the magnets 49 , 50 in FIGS. 5 and 6 installed stationarily to the ends of the path.
- the arm 46 comprises a second magnet 51 , with two repelling magnets 52 , 53 placed above and below.
- the three magnets 51 , 52 , 53 mentioned last are situated opposite each other as the arm 46 is in the half-way of its movement according to FIG. 6.
- the arm 46 which until now has moved along with the arm 22 pushed by the piston of the cylinder 24 , is able to move in front of the arm 22 pushed by the piston within the tolerance adjusted by the control screws 54 seen in FIGS. 5 and 6, and to finish the rotating movement by rotating the coupling ring 47 .
- the rotating movement is no longer dependent on the pressure difference prevailing in the piston cylinder 24 , and the rotating movement accelerated towards the end by the magnets does not tend to remain unfinished, as could happen when operating merely on the pressure difference and the cylinder piston.
- the attracting magnets 48 - 50 or the repelling magnets 51 - 53 may by themselves be enough to achieve the effect intensifying the necessary rotary movement.
Abstract
A filtering apparatus and method comprises parallel filtering elements backflushable with the pressure of the filtered flow. At least one washing organ connecting alternately to the different filtering elements, forms a discharge channel for the washing flow. A freewheel clutch is connected to a rotating axle of the washing organ, converting reciprocating movement generated with the pressure of flow in the filtering apparatus and with pressure alternating with it into a continuously parallel, stepping rotary movement of the washing organ. The mechanism containing the clutch may be outside the filtering room of the apparatus, and based on the alternation of the higher pressure of the flow filtered in the apparatus and the lower pressure from the discharge channel. The freewheel clutch is articulated to a piston in the cylinder, and is moved back and forth with the pressure difference, controlled by the channels relaying the pressure and by the valves.
Description
- This application is a continuation of copending International Application No. PCT/FI00/00800, filed Sep. 20, 2000, which designated the United States, and claims priority to Finish Patent Application 19991997, filed Sep. 20, 1999, the disclosures of which are incorporated herein by reference.
- The invention relates to a filtering apparatus, comprising an inlet channel for the flow to be filtered, an outlet channel for the filtered flow, a number of parallel filtering elements, into which the flow to be filtered may be directed so that the infiltration occurs out of the element through the element jacket, and at least one rotating washing organ connecting alternately to different elements for forming an outlet channel for the backflushing of elements generated with the pressure of the filtered flow. Further, the invention relates to a method for washing the filtering elements of the apparatus.
- A filtering device is needed especially in motors as a fuel or luboil filter, with the continuous backflushing of which the operation of the motor is ensured in long-term continuous use. The apparatus typically comprises a large number of filtering elements, the main part of which is continuously in operation while the washing is conducted in one or several elements at a time, depending on the number of washing arms.
- A state-of-the art backflushable filtering apparatus has been described in the patent publication DE-4 340 275. The apparatus comprises parallel, candle-shaped filtering elements arranged around a vertical axle as two nested rings. The flow to be filtered is directed into the elements from their upper and lower ends, and the infiltration occurs out of the element through the cylindrical jacket of each element. For backwashing the elements, a washing organ consisting of two washing arms of different lengths is arranged below them, the arms being fastened to the rotatable vertical axle of the apparatus. The washing arms are arranged to alternately connect to the lower ends of different filtering elements so that they form outlet channels for the washing flow. Corresponding to the washing arms, closers are attached to the rotating axle of the apparatus above the filtering elements, the closers closing the upper end of the filtering element in question for the duration of the washing stage, thus preventing the flow to be filtered from mixing with the washing flow.
- According to the publication DE-4 340 275, the rotating movement of the vertical axle of the apparatus and the washing arms is achieved with the help of a turbine rotor arranged in the inlet channel of the flow to be filtered and with cogwheels connected to it and acting as a transmission mechanism. The movement of the washing arms is thus maintained by the motion energy of the flow coming into the apparatus.
- The drawback of the solution in the publication DE-4 340 275 is that the rotation of the washing arms is dependent on the flow rate of the flow to be filtered coming into the apparatus, which may vary. If the flow rate is too high, it makes the washing arms to rotate too fast, and the washing periods of the filtering elements remain too short; and again, if the flow rate is too low, the washing arms rotate too slowly from one element to the other, or they stop altogether, if the decelerated flow cannot rotate the turbine rotor any more. The rotation of the washing arms is hindered by the rotor and the transmission mechanism getting dirty, and due to the structure of the apparatus, it is difficult to service the mechanism.
- The object of the invention is to provide a solution, in which the axle of the apparatus and one or several washing organs are rotated by utilising the flow pressure present in the apparatus so that the drawbacks associated with the state-of-the art technology can be avoided. It is characteristic of the filtering apparatus of the invention that a freewheel clutch is connected to the rotating axle of the washing organ, which converts the reciprocating motion generated by the pressure of the flow present in the apparatus and by the lower pressure alternating with it into a continuously parallel, stepping rotary motion of the washing organ.
- According to the invention, the rotation of the washing organ and the washing periods in different filtering elements are generated with a pressure difference, which it is possible to keep substantially constant, or which varies less than the flow rate of the flow coming into the apparatus. This ensures that the sufficiently long washing periods are repeated with a suitable frequency in all filtering elements of the apparatus.
- A substantial advantage of a second solution of the invention is that the freewheel clutch may be arranged outside the filtering room of the apparatus, connected to the rotating axle, so that it is easy to service the freewheel clutch and other organs maintaining the rotating movement, and the service may be carried out while the filtering continues.
- The freewheel clutch may consist of an actuator driving the rotating axle of the washing organ, which is alternately in sliding contact with the axle and which alternately locks into it so that the axle rotates along with the organ. The movement of the actuator may be generated, for example, by articulating it to a piston reciprocating on the alternating pressure.
- The pressure of the filtered flow is especially advantageously used for rotating the washing organ, by arranging the said flow to influence the said piston or another organ driving the freewheel clutch. The filtered flow is pure, so that it contaminates the rotating mechanism substantially less than an unfiltered flow. The apparatus of the invention preferably comprises channels and related control valves for connecting the pressure of the filtered flow and the lower counterpressure alternately to different sides of the piston.
- The lower pressure opposite the said pressure of the filtered flow may be the pressure prevailing in the outlet channel for the washing flow of the apparatus, to which the piston or another actuator may be connected. In the filters of a motor, the outlet channel is generally in the atmospheric pressure prevailing in the surroundings.
- The solution of the invention makes it possible to hydraulically adjust the rotating movement of the washing organ so that the frequency and duration of the washing periods may be controlled with it. The movement of the washing organ may thus be damped, or it may be stopped exactly at the place of the element to be washed, in which the washing organ remains for a desired time before the movement continues.
- In the method of the invention, the filtering elements are washed in the filtering apparatus, comprising an inlet channel for the flow to be filtered, an outlet channel for the filtered flow, and a number of parallel filtering elements, into which the flow to be filtered is directed so that the infiltration occurs out of the element through the element jacket. The washing is achieved by coupling alternately different filtering elements to the rotary washing organ so that the washing occurs as backflushing directed to the washing organ with the pressure of the filtered flow. Essential in the method is that the rotating axle of the washing organ is rotated continuously in the same direction in a stepping manner using a mechanism, the reciprocating movement of which is generated with the pressure of the flow in the apparatus and with the lower pressure alternating with this. The former pressure is advantageously the pressure of the clean flow filtered in the apparatus, and the lower pressure is the ambient pressure present in the washing arm.
- In the method, the steps of the washing organ may be generated with a freewheel clutch, comprising an organ driving the rotating axle of the washing organ, which is alternately in sliding contact with the axle and which alternately locks into it for rotating the axle, the said organ being moved with a piston articulated with it, the piston being reciprocated by coupling the said pressures of different sizes alternately to its different sides.
- FIG. 1 is a vertical section of a filtering apparatus of the invention;
- FIG. 2 is a horizontal section II-II of FIG. 1, in which the parallel filtering elements of the apparatus and the washing organs above them are shown;
- FIG. 3 shows the freewheel clutch and control valves connected to it for rotating the axle of the apparatus in the one extreme position of the coupling movement, as a section III-III of FIG. 1;
- FIG. 4 is a similar view to FIG. 3, presenting the freewheel clutch in its other extreme position;
- FIG. 5 shows the freewheel clutch of a second embodiment of the invention, with the related control valve, the coupling movement being in the other extreme position;
- FIG. 6 shows the freewheel clutch of FIG. 5 in the middle position between the extreme positions of its movement; and
- FIG. 7 is a vertical section of the coupling apparatus of FIGS. 5 and 6.
- In FIGS. 1 and 2, there is shown a filtering apparatus, which may work, for example, as the luboil filter of a diesel motor, continuously filtering oil as the motor is running. The apparatus comprises a
jacket 1, aninlet channel 2 for the flow to be filtered, anoutlet channel 3 for the filtered flow, and a number of longitudinal, candle-shaped filtering elements 5 arranged as two nested rings around themiddle axis 4 of the apparatus. The jackets of theelements 5 are made of porous filtering material, which retains the solid particles or other impurities in the flow as the flow extends from the interior of the elements through the jacket and out of the elements. For directing the flow to be filtered into theelements 5, each element is open both from itsupper end 6 and lower end 7. The spaces between theends 6, 7 of adjacent filtering elements are closed with ahorizontal plate plates cylindrical wall 10, which confines in its interior avertical flow channel 11 for the flow to be filtered. Thus, the flow can spread into the space restricted by thejacket 1, from where it is transferred into the elements through theopen ends 6, 7 of thefiltering elements 5, extends through the element jackets out of the elements and is discharged as purified into theoutlet channel 3. - In the apparatus according to FIG. 1, each of the candle-
shaped filtering elements 5 is divided in two by a horizontal,solid partition 12. Eachelement 5 thus comprises anupper part 13 open from its upper end and alower part 14 open from its lower end, through which the flows to be filtered travel independent from each other. - During the filtering process, the solid material gathering to the inner surfaces of the jackets of the
filtering elements 5 gradually blocks pores of the jacket, thus causing a decrease in the filtering capacity. In order to maintain the operation of the elements, the apparatus is provided with backflushing, which is conducted with the pressure of the filtered flow in the direction opposite to the flow to be filtered through the element jackets, i.e. from the outside of the jackets into them. Above and below theadjacent elements 5,washing organs 15 connecting alternately todifferent ends 6, 7 of the elements are arranged for coupling the elements to the lower pressure for generating the washing flow. Both washing organs consist of twowashing arms 15, the lengths of which are equal to the radii of the nested rings formed by the elements. The washing arms are made of a hollow tube, and they are fastened to the likewisehollow middle axle 4 of the apparatus so that together they work asdischarge channels 16 for the washing flow cleaning the element. Thedischarge channels 16 are directed to the lower part of the apparatus, from where the washing flow is suitably discharged, for example, to thedischarge assembly 18 in atmospheric pressure, after having passed through thefilter 17. - In the apparatus described, the backflushing works so that the
axle 4 with thewashing arms 15 fastened to it performs a rotating movement counter clockwise so that the washing arms connect from their ends alternately to theends 6, 7 ofdifferent filtering elements 5, thus coupling the interiors of these elements to a pressure which is lower than the pressure of the filtered flow in thedischarge channels 16 and thedischarge assembly 18, thus generating the backflushing. The washing occurs in the part between the end of theelement 5 and thepartition 12 at the same time as the opposite end of the element is open so that the filtering may continue in the part restricting to the said open end of the element. Thus, FIG. 1 presents a situation, in which the filtering continues in thelower part 14 of the leftmost element, while theupper part 13 of the element experiences backflushing, and the filtering continues in theupper part 13 of the rightmost element at the same time as thelower part 14 of the element experiences backflushing. Further, the filtering is naturally in constant operation in those filtering elements, which are not connected to the washingarms 15. During the process, the lower and upper part of each filtering element is cleaned by backflushing at regular intervals so that the filtering capacity of the whole apparatus is kept substantially constant in the process. - The rotating movement of the construction consisting of the
axle 4 belonging to the apparatus and of thewashing arms 15 rigidly attached to the axle is generated with a mechanism, the structure and operation of which may be seen in FIGS. 3 and 4. The rotating mechanism is arranged into thecasing 19 above the filtering space defined by thejacket 1 of the apparatus, theend 20 of theaxle 4 of the apparatus extending into this casing. Theaxle 20 is driven by a freewheel clutch, which comprises anorgan 21 annularly circulating the axle and moving in a reciprocating manner in accordance with FIGS. 3 and 4 so that it is alternately in sliding contact with the axle and that it alternately locks into the axle for rotating the axle along with the organ, depending on the direction of the movement. Such coupling arrangements, which may be based, for example, on an inclined, flexible or yielding cogging, are known as such. Theorgan 21 thus slides from the position according to FIG. 3 to the position according to FIG. 4 on theaxle 20, which remains stationary, but as the organ returns back to the position in FIG. 3, it locks into the axle rotating it along one step counter clockwise. Thus, theaxle 20 steps counter clockwise, rotating the washing arms 15 (FIGS. 1 and 2) so that they alternately connectdifferent filtering elements 5 to the washing stage. - The
annular organ 21 circulating theaxle 20 is provided with two protrudingarms arm 22 being articulated to thepiston 25 moving in thecylinder 24. Thepiston 25 is moved in thecylinder 24 back and forth utilising the higher pressure of the filtered flow present in the filtering room of the apparatus and the lower pressure of thewashing channels 16, by connecting these to the cylinder alternately in different sides of the piston. From the side of the filtered flow, the filtering room is in contact with thecasing 19 containing the freewheel clutch through the channel 26 (FIG. 1) so that the casing is filled with the filtered substance, such as lubricating oil. Respectively, a connection is built from thecasing 19 to theflushing channels 16 through thechannel 27. Thepiston 25 is controlled with themain valve 28 and twocontrol valves main valve 28 is connected to thecylinder 24 at different sides of thepiston 25 driving the freewheel clutch using thetubes leftmost control valve 29 is connected to the front end of themain valve 28 with thetube 33, and therightmost control valve 30 is connected to the back end of the main valve with thetube 34. Further, themain valve 28 and thecontrol valves channel 27 in the lower pressure with thetubes - In the freewheel clutch position according to FIG. 3, the
arm 23 of theactuator 21 has pressed thepiston 39 inside theleftmost control valve 29 against the spring into a position in which it releases the higher pressure in thecasing 19 from theassembly 40 into thetube 33 and from there to the front end of themain valve 28, in which it has pushed the piston of the main valve to a position in which the pressure in thecasing 19 has connected from theassembly 42 to thetube 31, which connects the pressure with thecylinder 24 to the right side of thepiston 25 driving the freewheel clutch. At the same time, the back end of themain valve 28 is connected to the lower pressure in thechannel 27 through thetube 34, theright control valve 30 and thetube 38. The movement of thepiston 41 of themain valve 28 connects thecylinder 24 to the said lower pressure from the left side of thepiston 25 through thetube 32, the main valve and thetube 35. - Connecting the pressure in the
casing 19 through thetube 31 to thecylinder 24 at the right side of thepiston 25 now makes thepiston 25 to move to the left in the figures so that the piston and theorgan 21 driving theaxle 20 slide into the position in FIG. 4. In this case, theactuator arm 23 presses theright control organ 30, the structure of which is the mirror image of theleft control valve 29, against the spring of theinner piston 43 to a position, in which it connects the pressure in thecasing 19 through thetube 34 to the back end of themain valve 28, in which the pressure moves thepiston 41 so that thetube 32 in its turn connects to the higher pressure in thecasing 19 through theassembly 42, and thetube 31 is connected to the lower pressure in thechannel 27 through themain valve 28 and thetube 36. At the same time, the movement of thearm 23 has let thepiston 39 of theleft control valve 29 to move to the right, pushed by the spring, so that the movement of thepiston 41 of themain valve 28 has been made possible as the front end of the main valve has connected to the lower pressure in thechannel 27 through thetube 33, theleft control valve 29 and thetube 37. - Coupling the higher pressure in the
casing 19 in the position according to FIG. 4 to the left end of thecylinder 24 makes now thepiston 25 and with it also theactuator 21 and theaxle 20 locking into it to return counter clockwise into the position in FIG. 3 at the same time as the movement of thepiston 43 of theright control valve 30 couples the back end of themain valve 28 to the lower pressure inchannel 27 for allowing the movement of thepiston 41 of the main valve. Theactuator arm 23 presses thepiston 39 of theleft control valve 29 to a position, in which it couples the pressure in thecasing 19 to thetube 33 leading to the front end of themain valve 28. Thus, the rotating mechanism has returned to its initial position, after which its operation continues in the way that is described above. - The duration of the washing periods may be adjusted by stopping the
washing arm 15 at the place of theelement 5 to be washed for a desired period. The adjustment may be achieved, for example, with flow controller valves (not shown) installed into thetubes piston 25 of thecylinder 24, so that thearm 15 stays stationary during the movement in question. Alternative ways for adjusting the rotating movement of thearm 15 may include the adjustment of the pressure prevailing in the casing by choking the flow going into or out from thecylinder 24 in thechannels channel 26. - FIGS.5-7 show an alternative control arrangement for the freewheel clutch for rotating the
axle 20 and the washing arms of the filtering apparatus. For the part of thereciprocating coupling ring 21,piston cylinder 24,valve 28, and thetubes flow assembly 27 leading into the washing channels, and thetubes valve 28, the structure in FIGS. 5-7 corresponds to that shown above in connection of FIGS. 3 and 4, and therefore, they are not explained in more detail here. - Compared with FIGS. 3 and 4, the substantial difference in FIGS.5-7 is that the
valve 28, which corresponds to themain valve 28 in FIGS. 3 and 4, forms the only control valve of the system. In FIGS. 5-7, thecontrol valves arms valve 28 back and forth between the two positions so that the higher pressure in the washing channels and theflow assembly 27 and the lower pressure in thecasing 19 of the freewheel clutch, containing thevalve 28, are alternately directed to different sides of the piston in thecylinder 24, maintaining thus the reciprocating movement of thering 21 and the parallel stepping rotating movement of theaxle 20. FIG. 5 shows the position of thering 21 and theleft arm 44, in which the arm has pushed the piston of thevalve 28 into the extreme right position of the piston. In FIG. 6, the piston of thecylinder 24 has rotated thering 21 counter clockwise by pushing thearm 22 to the half-way of the movement, in which thearms valve 28 are both detached from the ends of the valve. As the rotating movement continues further, theright arm 45 pushes the piston of thevalve 28 to the position extremely in the left, so that the pressures in different sides of the piston of thecylinder 24 switch places and start the reverse stroke of the piston and the rotation of thering 21 clockwise back into the position according to FIG. 5. - The freewheel clutch controlled with the pressure difference has the problem that if the pressure difference is small and/or if there is friction in the moving parts of the mechanism, it easily occurs that the piston of the
cylinder 24 begins to move but it does not have enough strength to complete the movement, but it stops without achieving the rotation of theaxle 20. It may also happen that the strength of thearm valve 28, which is the condition for the continuance of operation of the apparatus. These problems have been eliminated with the structure utilising magnets, which will be described next. - Besides the
clutch ring 21 rotated by thearm 22 of thepiston cylinder 24 pivoted to theaxle 20, the coupling comprises aseparate coupling ring 47 provided with thecrank arm 46 of its own, which is also pivoted to rotate theaxle 20. Thearms valve 28 are attached to thelatter ring 47. The rotation of thearm 46 and thecoupling ring 47 is achieved with the help of magnets in the arm installed stationarily in relation to thecasing 19. Theend 46 of the arm is provided with amagnet 48, which is attracted by themagnets coupling ring 47, thearm 46 comprises asecond magnet 51, with two repellingmagnets magnets arm 46 is in the half-way of its movement according to FIG. 6. - In the initial position of the rotation of the
coupling ring 21 in FIG. 5, the attractingmagnets ring 21 is half-way, the attractive force of themagnets ring 21. - The idea of operation of the rotating mechanism is, however, that the rotation performed by the piston of the
cylinder 24 is limited only to the transfer of thearms arms arm 46, the movement being further strengthened by the attractingmagnets arm 46, which until now has moved along with thearm 22 pushed by the piston of thecylinder 24, is able to move in front of thearm 22 pushed by the piston within the tolerance adjusted by the control screws 54 seen in FIGS. 5 and 6, and to finish the rotating movement by rotating thecoupling ring 47. Thus, after its half-way, the rotating movement is no longer dependent on the pressure difference prevailing in thepiston cylinder 24, and the rotating movement accelerated towards the end by the magnets does not tend to remain unfinished, as could happen when operating merely on the pressure difference and the cylinder piston. - The working mechanism of the freewheel clutch in FIGS.5-7 explained above is inventive in the opinion of the applicant, and besides the stepping rotation of the axle of the washing organ in the filtering apparatus, it may applied to any other application, in which the stepping rotary movement is controlled on the pressure difference.
- It is obvious for one skilled in the art, that the various embodiments of the invention are not limited to the ones shown as examples above, but they may vary within the scope of the enclosed claims. Especially the arrangement and detailed structure of the filtering elements of the apparatus, which are not the primary object of the invention, may deviate from the ones shown in the drawings. Neither does the invention require that washing organs be placed to both ends of the filtering elements, but if may also be sufficient to provide a rotating washing organ to one end of the elements, to which each of the filtering elements will be coupled in its turn.
- In the mechanism shown in FIGS.5-7, the attracting magnets 48-50 or the repelling magnets 51-53 may by themselves be enough to achieve the effect intensifying the necessary rotary movement.
Claims (12)
1. A filtering apparatus, comprising an inlet channel for flow to be filtered, an outlet channel for filtered flow, a number of parallel filtering elements , into which flow to be filtered may be directed so that infiltration occurs through a jacket of an element, and at least one rotating washing organ connecting alternately to the different elements for forming a discharge channel for backflushing of the elements generated with the pressure of the filtered flow; and a freewheel clutch connected to a rotating axle of the washing organ, wherein the clutch converts reciprocating movement generated with pressure of the flow in the apparatus and alternating lower pressure into a continuously parallel, stepping rotary movement of the axle.
2. The apparatus according to claim 1 , wherein the freewheel clutch comprises a coupling organ driving the rotating axle of the washing organ, which is alternately in sliding contact with the axle and which alternately locks into the axle for rotating the axle, the said coupling organ being articulated to the piston reciprocating on the alternating pressure.
3. The apparatus according to claim 2 , wherein in the apparatus includes channels and related control valves for coupling the pressure of the filtered flow and the lower counterpressure alternately to different sides of the piston.
4. The apparatus according to claim 3 , wherein the pressure in the discharge channel of the backflushing flow is coupled as counterpressure for the pressure of the filtered flow.
5. The apparatus according to claim 1 , wherein the filtering elements are cylindrical and arranged on one or several circumferences surrounding the rotating axle of the washing organ.
6. The apparatus according to claim 5 , wherein the washing organ consists of one or more tubular washing arms transverse to the rotating axle and connecting alternately to the ends of different filtering elements
7. The apparatus according to claim 1 , wherein the apparatus includes two or more washing organs connected to the same rotating axle for simultaneous backflushing of two or more filtering elements.
8. The apparatus according to claim 7 , wherein the apparatus comprises a washing organ at both ends of the parallel filtering elements, and that the washing organs are made as one piece with the rotating axle.
9. The apparatus according to one claim 1 , wherein the apparatus is adapted for filtering a fuel or luboil filter of a motor, especially a luboil filter of a diesel motor.
10. A method for washing filtering elements in a filtering apparatus, which comprises an inlet channel for flow to be filtered, an outlet channel for the filtered flow, and a number of parallel filtering elements, into which the flow to be filtered is directed so that infiltration occurs through an element jacket, in which method the washing is achieved by connecting different elements alternately to a rotating washing organ so that the washing is carried out as backflushing directed to the washing organ with the pressure of the filtered flow, and a rotating axle of the washing organ is rotated in a stepping manner continuously in the same direction using a reciprocating mechanism, the reciprocating movement of which is generated with the pressure of the flow prevailing in the apparatus and alternating lower pressure.
11. The method according to claim 10 , wherein the axle of the washing organ is rotated with the pressure of the filtered flow and with the lower pressure alternating with the filtered flow pressure.
12. The method according to claim 10 , wherein the steps of the washing organ are generated with a freewheel clutch, comprising a coupling organ driving the rotating axle of the washing organ, the coupling organ being alternately in sliding contact with the axle and alternately locking into the axle for rotating the axle, the moving of the said coupling organ being carried out with a piston articulated with the coupling organ, the piston being moved back and forth by connecting the said pressures of different elements alternately to different sides of the piston.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/660,392 US6827864B2 (en) | 1999-09-20 | 2003-09-11 | Filtering apparatus and method for washing its filtering elements |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI19991997 | 1999-09-20 | ||
FI991997A FI107021B (en) | 1999-09-20 | 1999-09-20 | Filtration plant and method for flushing its filter elements |
PCT/FI2000/000800 WO2001021280A1 (en) | 1999-09-20 | 2000-09-20 | Filtering apparatus and method for washing of its filtering elements |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2000/000800 Continuation WO2001021280A1 (en) | 1999-09-20 | 2000-09-20 | Filtering apparatus and method for washing of its filtering elements |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/660,392 Continuation US6827864B2 (en) | 1999-09-20 | 2003-09-11 | Filtering apparatus and method for washing its filtering elements |
Publications (1)
Publication Number | Publication Date |
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US20020092814A1 true US20020092814A1 (en) | 2002-07-18 |
Family
ID=8555313
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10/090,512 Abandoned US20020092814A1 (en) | 1999-09-20 | 2002-03-04 | Filtering apparatus and method for washing its filtering elements |
US10/660,392 Expired - Lifetime US6827864B2 (en) | 1999-09-20 | 2003-09-11 | Filtering apparatus and method for washing its filtering elements |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/660,392 Expired - Lifetime US6827864B2 (en) | 1999-09-20 | 2003-09-11 | Filtering apparatus and method for washing its filtering elements |
Country Status (10)
Country | Link |
---|---|
US (2) | US20020092814A1 (en) |
EP (1) | EP1231998B1 (en) |
JP (1) | JP4043786B2 (en) |
KR (1) | KR100752788B1 (en) |
DE (2) | DE60035893T2 (en) |
DK (1) | DK1231998T3 (en) |
ES (1) | ES2183751T3 (en) |
FI (1) | FI107021B (en) |
NO (1) | NO20021352D0 (en) |
WO (1) | WO2001021280A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030136715A1 (en) * | 2000-05-19 | 2003-07-24 | Willi Rott | Backflush filter, in particular for filtering lubricant oil |
US20070262003A1 (en) * | 2004-11-12 | 2007-11-15 | Tiefenbach Control System Gmbh | Method to operate a flushable filter column for a liquid |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102004004756A1 (en) | 2004-01-30 | 2005-08-25 | Hydac Process Technology Gmbh | filter means |
KR100630372B1 (en) | 2005-02-04 | 2006-09-29 | 주식회사 에네트 | Filtering Device |
US7487875B2 (en) * | 2005-08-30 | 2009-02-10 | General Electric Company | Candle filter assembly and candle filter element |
FI121367B (en) * | 2008-07-29 | 2010-10-29 | Parker Hannifin Oy | Rotary device and filtration method applying it |
CN101658741B (en) * | 2009-09-28 | 2011-05-04 | 郑业 | Reflow backwashing mechanism for automatic filtration of fluid |
KR101287090B1 (en) * | 2011-10-13 | 2013-07-17 | 주식회사 파나시아 | A High- efficiency Candle type Apparatus for Filtering Ballast Water with High-density Filters |
KR101287114B1 (en) * | 2011-10-14 | 2013-07-17 | 주식회사 파나시아 | A Candle type Apparatus for Filtering Ballast Water Preventing Backpressure |
CN115804983B (en) * | 2022-12-23 | 2023-09-08 | 珂睿斯科技(深圳)有限公司 | Self-cleaning continuous water purification filter element and self-cleaning method |
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US3176846A (en) * | 1961-10-17 | 1965-04-06 | Renard P Adams | Automatic strainer |
US3169109A (en) * | 1962-04-16 | 1965-02-09 | Hirs Gene | Filter apparatus |
US3176946A (en) | 1963-12-11 | 1965-04-06 | Floyd M Burdick | Watch holder |
FR1437838A (en) * | 1965-06-11 | 1966-05-06 | Filter with automatic cleaning device for all fluids | |
US3476248A (en) * | 1968-03-01 | 1969-11-04 | Renard P Adams | Suction backwash means for a low pressure,multiple element,filter assembly |
US4482461A (en) * | 1982-12-20 | 1984-11-13 | French Systems, Inc. | Backwash control for constant volume-pressure filtration system |
DE4030084C2 (en) * | 1990-09-22 | 1999-09-30 | Boll & Kirch Filter | Backwash filter |
DE4345412C2 (en) | 1993-11-26 | 1999-11-11 | Boll & Kirch Filter | Filter candle |
DE4340275C2 (en) * | 1993-11-26 | 1999-10-21 | Boll & Kirch Filter | Backwash filter |
FI110483B (en) * | 1999-09-20 | 2003-02-14 | Parker Hannifin Oy | filtration plant |
-
1999
- 1999-09-20 FI FI991997A patent/FI107021B/en not_active IP Right Cessation
-
2000
- 2000-09-20 DE DE60035893T patent/DE60035893T2/en not_active Expired - Lifetime
- 2000-09-20 JP JP2001524701A patent/JP4043786B2/en not_active Expired - Fee Related
- 2000-09-20 DE DE1231998T patent/DE1231998T1/en active Pending
- 2000-09-20 WO PCT/FI2000/000800 patent/WO2001021280A1/en active IP Right Grant
- 2000-09-20 EP EP00960728A patent/EP1231998B1/en not_active Expired - Lifetime
- 2000-09-20 KR KR1020027002804A patent/KR100752788B1/en not_active IP Right Cessation
- 2000-09-20 DK DK00960728T patent/DK1231998T3/en active
- 2000-09-20 ES ES00960728T patent/ES2183751T3/en not_active Expired - Lifetime
-
2002
- 2002-03-04 US US10/090,512 patent/US20020092814A1/en not_active Abandoned
- 2002-03-19 NO NO20021352A patent/NO20021352D0/en unknown
-
2003
- 2003-09-11 US US10/660,392 patent/US6827864B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030136715A1 (en) * | 2000-05-19 | 2003-07-24 | Willi Rott | Backflush filter, in particular for filtering lubricant oil |
US6890434B2 (en) * | 2000-05-19 | 2005-05-10 | Boll & Kirch Filterbau Gmbh | Backflush filter, in particular for filtering lubricant oil |
US20070262003A1 (en) * | 2004-11-12 | 2007-11-15 | Tiefenbach Control System Gmbh | Method to operate a flushable filter column for a liquid |
Also Published As
Publication number | Publication date |
---|---|
JP2003509203A (en) | 2003-03-11 |
DE60035893T2 (en) | 2008-04-17 |
DE1231998T1 (en) | 2003-02-06 |
DE60035893D1 (en) | 2007-09-20 |
NO20021352L (en) | 2002-03-19 |
ES2183751T1 (en) | 2003-04-01 |
WO2001021280A1 (en) | 2001-03-29 |
ES2183751T3 (en) | 2008-02-16 |
FI107021B (en) | 2001-05-31 |
EP1231998B1 (en) | 2007-08-08 |
US6827864B2 (en) | 2004-12-07 |
EP1231998A1 (en) | 2002-08-21 |
KR20020029939A (en) | 2002-04-20 |
FI19991997A (en) | 2001-03-20 |
KR100752788B1 (en) | 2007-08-29 |
NO20021352D0 (en) | 2002-03-19 |
DK1231998T3 (en) | 2007-11-19 |
JP4043786B2 (en) | 2008-02-06 |
US20040050803A1 (en) | 2004-03-18 |
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Legal Events
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Owner name: PARKER-HANNIFIN OY, FINLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KANGASNIEMI, MARKO;TAPOLA, PETRI;KOIVULA, TUOMO;REEL/FRAME:012672/0698 Effective date: 20011122 |
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STCB | Information on status: application discontinuation |
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