DE1786118A1 - Self-cleaning filter device - Google Patents

Description

Borje O, ROSAEN

Ann Arbor, Michigan, USA

Self-cleaning filter device

The invention relates to a filter device for a system of a fluid with a device for the automatic replacement of a soiled filter element with a · ^

clean filter element without interrupting the filtered Fluid flow in the system and in particular to an independent device for automatic cleaning of the polluted Elements after it has been removed from the system so that the cycle can be repeated.

A number of filter devices are known which include a Have construction for the purpose that allow a soiled filter element to be separated from a fluid system without the Flow of the fluid is interrupted. To effect continued filtering of the moving fluid, some are known Filter devices equipped with a filter element which is divided into sealed sections, wherein Means are provided for the continued movement of the filter element, so that there is always a section in the path of the moving fluid is arranged while another

109Ö48 / 0602

1786 113 ^€ . 1

Section is separated from the system for the purpose of cleaning. In general, such devices have a number of inherent disadvantages which limit their applicability. For example, such devices require separate means for cleaning the contaminated section, for example by introducing fluid from an external source. In general, continuously rotating filter elements W provided with the result of a high wear

of the moving parts "

In a preferred embodiment of the present invention, to be described in more detail below is a filter housing having an interior chamber and an inlet and an outlet communicating with the chamber. In the fluid chamber is a rotatable carrier ^ construction provided, which has a subdivision that

divides the chamber into a pair of sub-chambers that make up a filter chamber comprise, into which the fluid is supplied from an inlet, filtered and then discharged through an outlet, and a Cleaning chamber that is separate from the filter chamber. Self-adjusting wings are resilient along the opposite side Edges of the subdivision mounted and are in sealing contact with the side walls. A half-cytometry Filter element is arranged in each of the sub-chambers and on

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ORIGINAL INSPECTED

1786113 '

The support structure is removably mounted using a new type of clamping device »The clamping device include a first clamp holder disposed along the edge of the filter element and a J-shaped one Has cross section, and a second clamp holder which is carried by the support structure and also one Has a J-shaped cross-section, wherein the two clamp holders brought into engagement by a retaining clamp have a C-for- ■

have a moderate cross-section,

A ring plate mounted resiliently in the chamber sits on the upper edge of the filter elements. Spring urge the annular Plate in contact with the filter support and support the Wings when sealing the filter chamber against leakage from the cleaning chamber and also serve to compensate

the wear and tear and dimensioning tolerances. Ä

A pressure chamber communicating with the cleaning chamber is in the form of a cylinder. A piston is positioned in the pressure chamber to create a return flow through the filter in the purge chamber, thereby flushing foreign particles into a sump. A nozzle directs pressurized fluid from the filter chamber against the filter element in the purge chamber, around the

109848/060 2 original inspected

to loosen foreign particles deposited on the filter element before the backwashing process.

This improved means in the form of a cylinder-piston arrangement for creating a reverse flow through the filter element creates a strong backwash flow so that the element in the cleaning chamber is in a clean condition W for exchange with the contaminated element in the filter chamber.

Another preferred embodiment of the invention is intended for use as a cooling system for a machine tool and has a coolant reservoir from which the fluid is pumped to a filter device for cleaning. the clean liquid is then fed to the machine and returns to the reservoir. A preferred filter device

comprises a pair of semi-cylindrical filter elements releasably on opposite sides of a planar partition member are mounted. The partition can be rotated between two rotational positions of 180 in an inner chamber of the housing assembled. In both rotational positions, the inner chamber is cut into a pair of chambers, a filter chamber and a Divided cleaning chamber, with one of the filter elements in the filter chamber for separating out the Schmittzteilchen

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the fluid as it flows through the filter chamber, arranged and the second filter element is in the cleaning chamber, A pressure chamber is with the cleaning chamber connected and in the pressure chamber a piston is actuatable to a backwash flow through that in the cleaning chamber to generate arranged filter element after, the filter element from the filter chamber in a dirty state has been rotated.

It is essential that the fluid chambers be separated when the subdivision is in one of its rotational positions. To achieve this separation of the fluid, the partition carries a pair of wing elements along its side edges, which are loosely mounted and thanks to a new type of ball valve construction are balanced with the pressure so that when the partition rotates the blades tilt in such a way that they clean themselves.

The cleaning chamber has a coolant reservoir connected so that the backwash flow through the filter element and then flows to the reservoir. To prevent pressure fluctuation in the system when the partition rotates and which due to the construction with an open center of the inner

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chamber closes a valve in the Line between the purge chamber and the reservoir automatically when the partition is in an intermediate position located. Thus it is a continuous, uninterrupted one Fluid flow through the device when the two filter elements are replaced.

Around the removed from the filter in the cleaning chamber To collect foreign particles, the line leads from the cleaning chamber to the reservoir through a felt bag, the separates the foreign particles from the backwashing liquid. Thus, the backwash liquid is in a reasonably clean state returned.

The filter housing has a removable side cover which allows the filter elements to be removed individually in the form of a sleeve for easier maintenance and replaceability.

The invention is intended below on the basis of exemplary embodiments with reference to the accompanying drawings, in the same Reference characters refer to the same parts throughout the different views refer to be explained in more detail. In the drawings demonstrate:

fr $ £ 48/0602

Fig. 1 efoe elevation view of a filter device according to the invention connected to a system is, portions of which are shown schematically for the sake of clarity;

Fig. 2 is a sectional view taken along line 2-2 in Fig. 1; Fig. 3 is a sectional view taken along line 3-3 in Fig. 1; FIG. 4 shows a plan view of the device according to FIG. 1

with parts broken away;
Fig. 5 that preferably used in the filter device

electrical circuit in schematic representation; 6 is an enlarged view taken along line 6-6 in

Fig. 3;
Fig. 7 is a schematic flow diagram of another

Embodiment of the invention; FIG. 8 is an enlarged view of the device according to FIG.

with parts schematically and others in section f

are shown;
9 is an enlarged sectional view taken along line 9-9

in Fig. 8;
Fig. 10 is an enlarged sectional view taken along the line

10-10 in Figure 8;
Fig. 11 is an enlarged sectional view taken along line 11-11 in Fig. 8;

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Fig. 12 is an enlarged sectional view taken along line 12-12 in Fig. 10;

13 is an enlarged sectional view of the sealing wings and their mounting arrangement;

14 shows a preferred electrical circuit in a schematic representation;

15 is an enlarged sectional view showing part of the upper wear plate in the inner chamber;
and

16 is a perspective view of a sealing member separated from the cover and the upper wear plate,

In Figs. 1 to 6, a preferred filter device is shown, which comprises a housing 10 which is mounted on a carrier 12. A cap member 14 is attached to the upper end of the housing 10 and cooperates therewith to form a substantially cylindrical chamber 16 for a fluid. Hereinafter To simplify the description, only liquid should be spoken of, although this also refers to gaseous media could be.

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The housing 10 ^ has a liquid inlet 18 and one Liquid outlet 20, both with the liquid chamber 16 stay in contact. Preferably, a pump 22 is with the Outlet 20 connected by a line 24. However, in a high pressure system, the inlet 18 may be connected to the pump outlet and the outlet 20 would then represent the inlet for the FilussSgkeitssystem from the filter ..

· .- ■ ■ ^; ■ :. ■■ ^:

A vertically mointed support shaft 26 is for rotation in the liquid chamber 16 with its lower end in a bearing - Bushing 28 and with its upper end in an upper bearing: bushing: e 30 mounted.

"In Fig. 3 is tgezeigti that the division device 3-2, -the is supported by the shaft 26, the liquid chamber 16 in inip ^ ^ ^ r ^ artUni amnlern-divided that a filter chamber 34 and ^v ^ einfrSäuberu skaiimier 36. The filter chamber 34 communicates with the inlet 18 and with the outlet 20, the liquid of the system being normally fed through the inlet 18 into the filter canister 34 and discharged through the outlet 20 ". The cleaning chamber 36 is separated from the filter chamber 34 and is sealed so that liquid cannot escape from the cleaning chamber 3B into the filter chamber 34.

The sub-dividing device 32 comprises a dividing member 38, secured to shaft 26 by a key 40 so that shaft 26 and sub-divider 38 rotate together. The opposite side edges of the subdivision 38 are provided with recesses that are used to mount seal holders 42 and 44. These essentially extend over the entire height of the sealing chamber 16,

A pair of resilient wings 46 are mounted in the holder 42 and are urged against the wall of the liquid chamber 36 by a pair of springs 48 which are arranged in the holder 42. In this way, the wings 46 are at all times in contact with the wall of the liquid chamber 16 and are self-adjusting to compensate for the wear and tear on their contact edges,

fe. A second pair of resilient wings 50 are in the opposite one Holder 44 is mounted and is continued by springs 52 Contact with the wall of the Eilte rkammer 16 held.

On each side of the partition member 38 is a filter sleeve mounted, one in the Saubeiningskamnier 36 and the Another filter sleeve 54 is arranged in the filter chamber 3i4. Each filter sleeve xoni taps into an inner semi-cylindrical holder 56,

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an outer elb-cylindrical holder 58, a between the inner and outer holder 56 and 58, respectively, pleated filter element and end cap 59, as best shown Fig, 2 can be seen. The inner and outer brackets 56 and 58, respectively attached to the wing holders 42 and 44.

The folded element 60 is preferably made of a fine one Wire mesh is made and its opposite side edges are attached to a clamp 62 which is J-shaped Has cross-section. A mating clamp 64 having a J-shaped cross-section is attached to each side of the brackets 42 and 44, each pair of clamps 62 and 64 by an elongated one Holder 66 are joined together, which has a C-shaped Has cross-section. The holder 66 are slidably seated on the Clamps 62 and 64 and allow the pleated filter elements easily and quickly from the subdivision facility " can be separated.

As best shown in FIG. 2, the filter sleeves 54 are between an upper annular filter plate 68 and a lower annular filter plate 70 clamped by the partition device 32 are worn. The lower filter plate 70 sits on a lower wear plate 72 which is on top of the lower Surface of the liquid chamber 16 is mounted. An upper one

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annular wear plate 74 stands with the upper one Filter plate 68 in contact and is urged against it by a plurality of springs 76, (only one of which is shown is) and which sit in recesses in the cap 14. This arrangement allows the wear plate 74 to continue Is in contact with the filter plate 68 and additionally compensates for wear, dimensioning tolerances and the like, see above that a continued seal between the cleaning chamber 36 and the filter chamber 34 is present.

The upper end of the support shaft 26 is internally keyed Part 80 coupled to the output shaft of a drive motor ^ 82, which is mounted on a mounting ge alternate 84 on top of the cap 14 is. The gear motor 82 rotates in response to signal means to be described below, the P Support shaft 86 by 180 to replace the filters that are in the

Cleaning chamber 36 and arranged in the filter chamber 34 are. A cam 86 is carried by the part 80.

As can best be seen from Fig. 2, under the cleaning · Chamber 36 formed a sedimentation chamber 88 to the accumulate foreign particles that are detached from the interior of the filter sleeve 54, which is located in the cleaning chamber 36

10 9 848/0607 ORIGINAL INSPECTED

in Fig. ~ -3 is. A valve 90 is shown, which for .Removing the accumulated in the sedimentation chamber 88 foreign particles.

^ shows pieam-best _:: Figure 2, is over an opening 94 in the housing 10, a transparent plastic plate 92 mounted and serves ms.ue3I dasJnnere to observe the purge chamber 36 .. The plate 92 may also be ^ fam-nichttransparen of material exist.

A sump 96 is through a conduit 98 to the lowest part the cleaning bunting 36 connected.

A cylindrically shaped part 100 is shown in FIGS is mounted and .ein a substantially cylindrical shape Pressure chamber 102 limited. A passage 104 connects the "

pressure chamber 102 with the cleaning chamber 36. In the pressure chamber 102, a cap-like piston 106 can be displaced .arranged and is.by a spring 108 in the direction away from the Passage 104 crowded.

The pressure chamber 10; 2 ijtt closed by a cap 110, which carries an inwardly directed guide rod 112. the

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Guide rod 112 guides the piston 106 between its advanced and retracted position in the pressure chamber 102, the cap -110 has an inwardly directed annular shoulder 113. When the piston 106 is in its fully retracted In the position it is in, it rests on shoulder 113 and forms a chamber 114.

In response to a signal, pressure medium is introduced from source 116 through conduit 118 into chamber 114 and urges the piston in a direction away from cap 110 and towards passage 104. This creates a pressure wave of the liquid accumulated in chamber 102, which moves through the cleaning chamber 36 and the foreign particles that are-in the cleaning chamber, through the line 98 to the sump 96 feeds. This backwash flow through the filter 54 ψ is superimposed on the movement of the liquid, which with

flows at a higher speed, so that the filter sleeve • and the cleaning chamber is completely flushed.

We ₁ Il dieDruckkammer 102 is disposed above the liquid Kaminer 16, passes some accumulation of air ;, which has the FINISH 3Se to accumulate inthe filter device ,; up. into the pressure chamber 102. An air outlet port. 120 ensures that the accumulated air is safely evacuated to the other parts

AS

to protect the fluid system. The valve 120, which can be open and closed, is controlled by the solenoid 121. The solenoid 121 is electrically connected to the system so that the valve 120 is in the air outlet position when the filter system is in operation. When the system does not work, the solenoid 121 closes the valve 120 to prevent the fluid that has accumulated in the pressure chamber from flowing out. . '

As best shown in Figures 2 and 4, the inner end is the Connect line 122 with the filter chamber 34 on the outlet side of the filter sleeve 54, which is arranged in the filter chamber 34 and supplies relatively clean liquid to a pump 124 which supplies the liquid under pressure through line 126 a nozzle 128 discharges. The nozzle 128 is in the cleaning

Chamber 36 is mounted and directs fluid under pressure on the Ä

the outer surface of the filter sleeve 54, which is in the cleaning chamber 36 is arranged. This continued, pressurized flow dislodges the foreign particles from the outer surface of the filter canister when rotated from the filter chamber 34 into the purge chamber. The dissolved foreign particles are subsequently is removed by the backwash created by the movement of the piston 106 in the pressure chamber 102.

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JH,

The Pig. 3 is used to create a Indicate fluid pressure change at inlet 18 and comprises a substantially cylindrical extension 132 of the housing 10 with a cover plate 134 which cooperates with the extension 132 to delimit a chamber 136. A cap-shaped one Piston 138 is axially displaceable as a rod 140 which extends inwardly from the cap 134. The piston 138 is arranged so that its peripheral surface is a has a soft sliding fit with the inner surface of the bore of the boss 132 at the inlet 18.

A compression spring 144, one end of which presses against the cap 134 and the opposite end of which acts against the piston 138, urges the piston toward the inlet 18. The spring 144 is like this ^; selects that it holds the piston 138 in a position in which the ψ enlarged head of the rod 140 rests when the filter sleeve 54

is in a clean condition in the filter chamber. If, however, the filter element 54 arranged in the filter chamber 34 filters out foreign bodies from the liquid contaminated condition "is assumed, it creates a congestion which reduces the liquid velocity, so that the inlet pressure increases sufficiently, u in the piston 138 axially against the force to push the spring 144; · Ϊ

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The piston 138 has an inwardly directed guide member 146 which is mounted against a crank arm 148 which has a regular longitudinal twist. The crank arm 148 is for supported for rotation about its longitudinal axis at the inner end of a shaft 150. The outer end of the shaft 150 is in the cover plate 134 stored and extends through this.

As best shown in Figure 6, the outer end of the shaft carries ™

134, a cam 152 and a pointer 154. When the piston 138 moves inwardly against the bias of the spring 144 under the action of the increasing pressure at the inlet 18, the guide member 146 causes the crank arm 148 and the shaft 150 to rotate, whereby the Pointer 154 crosses a labeled plate mounted on cap 134. The pointer 154 and the plate 156 labeled give a visual indication of the filter state of the filter element 54, which is arranged in the filter chamber Toggle λ 34th

On cap 134 is a normally open plunger switch 158 mounted so that when the cam 152 is rotated clockwise, when the filter element 54 is in the filter chamber 34 a Dirty ^ state assumes that the switch 158 turns on the gear motor 82, which initiates the rotation of the support shaft 26.

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_{The preferred electrical circuit is shown in FIG. 1} , with switches 158 and 160 connected in series with a motor 82 and a coil 162 of the starter relay for the motor 82. The normally open contacts 164 of the starter relay coil bypass the switch 158. The normally open switch 158 is closed at an increased pressure differential across the filter element 54, which is arranged in the filter chamber 34, so that the relay coil 162 is energized, which in turn turns on motor 82 and contacts 164 closes.

When the support shaft 26 rotates,! the clean filter element 54 rotated in the cleaning chamber 36 into the filter chamber 34, whereby the pressure differential drops to its normal level, so that switch 158 resumes its normally open state. The cam 86 contacts the normally closed Switch 160 to place it in an open position and so turn off the motor 82 and relay 164. If the engine 82 by its inertia the. Cam lead of the cam 86 has moved past the switch 160 so that he again assumes its closed state, the circuit remains open, until the next cycle is initiated after pressure is built up across the filter element 54 to a predetermined one Level. -

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There has thus been described an improved filter apparatus which includes a pair of filter elements 54 disposed in a liquid chamber 36 with a partition that defines the two Separates filter elements from each other. A filter element 54 is in the filter chamber and comes into contact with the liquid, when directed from the inlet to the outlet of the housing. The pressure sensing device 130 shows the change in pressure on the filter element 54 in the filter chamber 34, the motor 82 being switched on in a dirty state, so that the two filter elements are exchanged and the dirty filter element is exposed to a nozzle 128, when it is moved from the filter chamber into the cleaning chamber 36. The dozens straighten clean pressurized ones Liquid against the outer surface of the dirty filter element, around the strange particles that have accumulated on it have to solve. When the two filter elements are rotated 180 have been so that the contaminated item in the cleaning chamber is located, a pressure medium source 116 is turned on by a circuit (not shown) and actuates the Piston 106, which generates a pressure medium wave in a reverse direction through the contaminated element 54, so that the foreign Particles are discharged through conduit 98 to a sump 96, leaving the element in the purge chamber in a clean Leave the state behind for the next work cycle.

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7-16, another preferred fluid system 210 is for circulating a coolant fluid for a machine tool not shown is shown. The system includes a reservoir 212 and a generally 214 filter device. The filter device has an inlet 216 and an outlet 218. A line 220 connects the reservoir 212 with the inlet 216 of the filter device and a pump 222 in P of the line, the liquid to be filtered leads the inlet 216 of the

Filter device 214 to. The filtered liquid is from the filter device through a conduit 224 to the machine tool supplied, from which the liquid is returned to the reservoir (not shown).

The filter device 214 includes a housing 224 that has an interior chamber 226 owns. A generally planar divider 228 is rotatably mounted in interior chamber 226 and is used

in sections by a drive 280 between two rotary positions, offset by 180,, rotated, in which the subdivision 228 the inner chamber 226 is divided into a pair of chamber sections, hereinafter referred to as the filter chamber 232 and the cleaning chamber should be designated. A pair of generally semi-cylindrical Filter sleeve elements 236 and 238 are on opposite sides Sides of the dividing device 228 mounted so that they

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in common an essentially cylindrical filter device form. In each of the operating rotary positions of the dividing device 228 is the one filter element in the. Filter chamber 232 and the second filter element in the cleaning chamber 234

arranged so that when the dividing device 228 is rotated, the two filter elements 236 and 238 are exchanged in their relative positions. The filter element in the filter chamber 232 is positioned between the inlet 216 and the outlet 218 ™ so that the liquid introduced into the filter chamber 232 passes radially through the filter element and then flows through the outlet 218. When the filter element in the filter chamber 232 assumes a contaminated state, it generates a pressure change in the liquid system. A sensing device, generally designated 240, indicates this pressure change and, by means of a suitable circuit, which will be described below, a signal is sent to the drive ä device 230 transmitted, the comb-the soiled filter element from the filter chamber 232 in the purge chamber 234 and the clean filter element in the Säube approximately rotate in the filter chamber 232 234th This automatic exchange takes place without interrupting the continuity in the flow of liquid in the system. ·

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• λ A pressure chamber 242 is through a passage 244 with

connected to the inside of the filter element arranged in the cleaning chamber 232 and a piston 246 in the pressure chamber 242 is actuated after the dirty filter has been moved into the cleaning chamber 234 to a sudden Generate pressure shock wave, which causes a reverse flow through the contaminated filter element and which on the outer surface

dirt particles that have accumulated on the element are removed. The backwash flow generated by the pressure wave is released from the filter element directed to a line 248 which supplies the backwash liquid to the reservoir 212. One mounted on the end of conduit 248 Liquid decelerator 250 reduces the speed of the backwash flow before it enters the felt pocket ή52 which separates the dirt particles in the backwash liquid. The felt bag 252 is in a perforated container h 254 mounted in reservoir 212.

A valve 256 in line 248 is normally open during the backwash process and is automatically closed, when the dividing device 228 is in a position between the two rotational positions, the filter chamber 232 and the cleaning chamber 234 are open to one another. Consequently becomes the pressure in the saturation chamber 234 and in the system maintained until the divider 228 in its

Change position has been rotated.
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In FIGS. 8 to 11, a housing 224 is mounted on a foot 258 and has a housing part 260 in which an inlet 216 and an outlet 218 is formed with a removable cover 262 screwed to one side of the housing part 260 at the top and allows access to the internal parts when removed. The top cover 262 also supports the drive device 230, A side cover 264 is removably mounted on the side of the housing part 260 and allows access to the interior chamber 226 so that the filter elements can be removed from the chamber 226 one at a time. The cover 264 has a central one Opening, preferably closed by a transparent plate 266 that allows visual observation of the interior of the housing 260; As best shown in Fig. 9, this is Housing part 260 hollowed out internally to form a sedimentation chamber 259 under the filter element 238 on its inside. This settling chamber can be connected to a deposit line which is provided with a suitable valve (not shown) for cleaning purposes. A second sedimentation chamber 261 is in the housing part 260 on the outside and under the filter element formed in the cleaning chamber 234. The settling chamber 26.1 is connected to the reservoir 212 by a line 248 tied together.

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As FIG. 8 shows, a drain valve 272 is connected to the opposite side of the settling chamber 261, which is used for Draining the liquid from the interior of the housing part 260 is used.

9, the cover 262 has a pair of passages 274 and 276. The passage 274 is in communication with the inside of the filter element which is arranged in the filter chamber 232. Passage 276 communicates from pressure chamber 242 to the inside of that in purge chamber 234 arranged filter element ago.

Line 278 communicates between pump 280 and chamber 232. The output of the pump 280 leads through a line 281 to a valve 282, the optionally clean W liquid through a connection 283 to the pressure chamber or

through a connection 284 to a nozzle 285 located in the Purge Chamber is mounted. When the dirty filter element is rotated into the cleaning chamber 234, liquid filtered through the nozzle flows against the outer surface of the filter element. When the subdivision is in one of its rotational positions is located, the connection 283 is used to fill the pressure chamber 242.

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ti

It should be noted that, as shown in FIG. 8, the pressure chamber 242 is mounted over the cleaning chamber and is closed off by a cover 286 which carries an inwardly directed guide rod 288 for guiding a piston 246 between its alternating positions in the pressure chamber 242 The piston 246 can be moved between a retracted position, where it rests against an annular shoulder 290 ′ which, in the λ

Inside of the Aüdcekung 286 is formed and an advanced Position where it rests against an enlarged part 292 of the guide rod 288. One placed in the chamber Spring 294 urges piston 246 to its retracted position. In response to a signal, pressurized fluid is drawn from a source 296 is inserted through a conduit 298 behind the piston 246 and urges the piston away from the cover 286 so that it is a Pressure wave generated through passage 276 to

Moved inside of the filter element in the cleaning ^

chamber 234 is arranged. When the blast comes through When the cleaning chamber 234 moves, it removes debris on the dirty filter element and leads it to line 248.

Because the pressure chamber 242 is mounted above the cleaning chamber 234 is, any air carried by the liquid that the Tendency to rise has accumulated in the pressure chamber.

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An air release valve 299 is used to discharge the accumulated Air. The valve is controlled by a solenoid 300. The solenoid 300 is operated by suitable control devices, so that the valve 299 is opened to the deflation position when the filter device is in operation. However, if the device is not in operation, the solenoid 300 closes the valve 299 fe to prevent fluid from draining from the pressure chamber.

Referring to FIGS. 9, 10 and 11, the divider 228 is mounted on a vertically disposed drive shaft 302 by a key 304 to rotate in the interior chamber 226. The lower end of the shaft is supported in a bushing 306 and the upper end in a bushing 307 in the cover. The lower one Bushing 306 has an annular groove 306A which mates with an axial groove 306B on the cleaning chamber side of the dividing device is connected to collect the leakage fluid from the purge chamber 232, which extends downward between the housing 200, the bushing 306 and the dividing device 228. The leakage fluid is through an opening 306 C to the settling chamber 259 supplied. The upper end of the shaft extends through cover 262 and is coupled to drive 230. The drive 230 includes a gear motor 308 which is mounted on the cover 262 on a mounting foot 310. On the

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upper end of the drive shaft 302 sits a cam 312, the with. a switch 314 which controls the rotation of the drive shaft 309 in a manner that follows should be described in more detail.

As best shown in FIGS. 10 and 13, each side edge of the partition member 228 is provided with a vertical groove 316. A holder 318 is mounted in each of the grooves 316 and has a groove 3βΟ in which a pair of wings 322 and 324 sit. The wings 322 and 324 are urged outwardly by a spring 328 so that their outer edges seal with the cylindrical side wall 330 of the housing are in contact, which is part of the Side wall of the inner chamber 226 forms. The cylindrical side wall parts 330 are formed around the axis of rotation of the subdivision 228. As shown in Fig. 13, the wings 322 and 324 are loose in their grooves 320 so that they tilt from side to side as the partition 228 rotates to cover any debris that can accumulate when the partition is rotated between its alternate positions. The two wings are attached to its holder by a bolt 322. The wing 324 is made of rubber and the wing 322 is made of metal.

The holder 318 has a passage 334 that is connected to a pair

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- short passages 336 and 338 in the partition 228 connected is. Passage 336 communicates between passage 334 and chamber 232 during the passage 338 is used to connect between the passage 334 and the cleaning chamber 234. In the passage 334 is a ball 340 arranged and moves between the opposite ends of the passage 334 depending on the pressure ^ iifferential,

™ that between the cleaning chamber 234 and the filter chamber

232 exists. A short passage 342 connects the passage 334 with the groove 320 in which the wings sit, so that the in the Passage 334 is pressure present in the groove 320 and behind the wings. The two wings 322 and 324 are with a pair of opposing grooves 334 on their facing Provided surfaces so that the grooves 344 the pressure changes in the passage 334 at the outer edges of the

K blades 322 and 324 reproduce. Thus, the ball 340 acts as a

a valve that takes a position depending on the chamber, which has the greater fluid pressure. The wings 322 and 324 are substantially balanced by the pressure exerted behind the two wings in the groove 320 prevails, which always reflects the pressure in the chamber that has the greater pressure than the valve moves back and forth in response to changes in the pressure differential that exists between the filter chamber • and the purge chamber 234 exists.

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From Figs. 9, 10 and 13 it can be seen that each of the Filter elements 236 and 238 are in the form of a cartridge which can be easily removed through the side cover 264. Each Filter element includes an externally perforated, generally semi-cylindrical shell portion 346, an inner, generally semi-cylindrical semi-cylindrical section 348 and a removable one Screen element 3 50 which is generally pleated in shape. The outer jacket 346 and the inner jacket piece 348 are ·· - ™

put together, wherein the sieve element 350 is arranged in a housing which is formed by the two casing elements. The screen 350 is secured by an elongated clip 352 that is J-shaped in cross section and attached to the side edge of the screen 350. A second elongated retaining clip 354 having a J-shaped cross section is fixedly attached to the inner shell 348, and an elongated retaining clip 356 having a C-shaped cross section is connected to the clamps 352 and Λ

354 connected by a sliding movement in the direction parallel to their longitudinal edges. The filter element 236 and the filter element 238 are equal to each other and each is threaded through retainer 358 attached to holder 318. Thus, each filter element can be removed through the access opening through the Removal of the cover 264 is enabled and the screen element 350 can be removed from the two jacket sections by loosening the clamp holder 356 · must be separated from the two terminals 352 and 354.

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The sieve element 350 can then be spread out, cleaned and quickly and easily returned between the casing elements 346 and 346 348 must be installed.

According to FIGS. 9, 15 and 16, each filter element can be between an upper ring 360 and a lower ring 362 are clamped. The lower ring section 362 slides on a lower one Wear plate 364 which is mounted on the bottom of the interior chamber 226. The upper wear plate 366 is between the cover 262 and the two filter elements. The wear plate 366 is prevented from rotating by a bolt (not shown} and is urged downward against the filter elements by a spring 368. The preload of the spring down is through a gap between the peripheral edge of wear plate 366 and housing 262 as at 3 68A and a gap formed between the Surface of wear plate 366 and housing 262 at 368B, allowing pressurized fluid from the chamber acts downwards on the wear plate.

The housing 262 has a longitudinal groove 370 above the wear plate. An elongated sealing element 372 sits in the groove 370 and forms a seal for the medium between the

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Chambers 232 and 234 when the dividing device 228 is in one of its rotational positions.

10 and 12, a scanner 240 indicates a pressure change occurring at inlet 216 caused by the filter element in the filter chamber 232 when it becomes contaminated. The scanner 240 includes a substantially cylindrical chamber 374 having a Bore 376 adjacent inlet 216 and another bore 378 (best seen in FIG. 7) that mates with outlet 218 in FIG Connection. A cap 380 is mounted at one end of the chamber 374 and carries an inwardly directed guide rod 382, which extends to opening 376, Eh cap-shaped Piston 384 is sealingly slidable on the rod in bore 376. Thus, the outer surface of the Piston 384 is exposed to pressure in inlet 216 and the inner surface of piston 384 is exposed to pressure at outlet 218, so that the piston moves to positions corresponding to the pressure differential correspond between inlet and outlet.

The rod 382 has an enlarged end 386 that allows movement of the piston 384 is limited away from the cap 380. One Spring 388 in chamber 374 urges piston 384 away from cap 380 and is of a selected strength so that the

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Piston begins to move when a predetermined pressure « differential across the inlet through a dirty filter element is produced.

A piston 384 has a slotted guide portion 390 that is mounted against a crank arm 372, which has a uniform longitudinal twist. The crank arm 392 is for a Rotation about its longitudinal axis mounted on the inner end of a shaft 394 which is mounted in the cap 380 and which follows extends outside of the cap 380. As best shown in Fig. 12, the outer end of the shaft 394 carries a cam 396 and a pointer 398. When the piston 384 moves against the bias of the spring 388 by the change in the pressure differential is, the guide member 390 causes the crank arm 392 and shaft 394 to rotate with the pointer one

P labeled plate 400 crosses which is mounted on the cap 380

is. The pointer 398 and the labeled plate 400 cooperate for a visual indication of the filter status of the filter element located in the filter chamber 232.

A normally open plunger switch 402 is mounted on the cap 380 and is arranged so that when the cam rotates 396 clockwise when the filter chamber 232

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ORlGtNAL SNSPHCiED

orderly filter element is soiled, the switch 402 turns on the gear motor 308 which controls the rotation of the drive shaft 302 initiates.

In Figs. 7 and 14, a preferred circuit is illustrated showing that the switches 402 and 314 in series with a motor 308 and a coil 404 of the starter relay for the motor 308 overall _ λ

are switched. Normally open contacts 406 of the starter relay lock switch 402, the normally open switch is closed at an increased pressure differential across the filter element arranged in the filter camera 232, so that the Relay coil 404 is excited, which in turn switches on motor 308, closes contacts 406 and thus a normally open solenoid, which is intended for the Valve 256 in the backwash line 248 to close.

When the drive shaft 302 begins to rotate, it will clean filter element in the cleaning chamber 234 rotated into the filter chamber 232, with the pressure differential to its normal level returns so that switch 402 returns to its normally open position. The one from the Drive shaft carried cam 312 comes with that normally closed switch 314 to activate it instantly.

109848/0602

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borrowed to move into an open position and thus the Turn off motor 308, relay 406 and solenoid switch 408. When the engine 308 by the persistence one of the two projections of the cam 312 moves past the switch 314 so that it is again in its closed state occupies, the circuit remains open until the next one Cycle initiated by changing the pressure differential across the filter element located in the filter chamber 232 will. A solenoid valve 410 is then unlocked to supply pressurized fluid, such as compressed air, from a source 296 behind Insert piston 246.

10 9848/0602

Claims (45)

178611 claims 1. Self-cleaning filter device for sorting out Dirt particles from a moving medium with a housing having a chamber, an inlet for the inflow of the medium to be filtered and an outlet, the inlet and outlet communicating with the chamber, M characterized, that a dividing device is rotatably arranged in the chamber is that the dividing device in its operating position divides the chamber into a first and a second sub-chamber divided, the first sub-chamber communicating with the inlet and the outlet in communication and the second sub-chamber separated from the normal flow of the medium from the inlet to the outlet, that a first and a second filter element on the opposite sides of the dividing device are mounted, with the one filter element in the first sub Chamber and the other filter element in the second sub-chamber in the operating position of the dividing device are located. 2. Device according to claim 1, characterized in that ¹ T- that the second sub-chamber is assigned a pressure chamber, 109848/0602 WGtf *** - ¹ ^ in which a piston is arranged to be axially displaceable and is actuated to a pressure medium surge in the reverse direction generated by the filter element in the second sub-chamber, so that the dirt particles from the filter element in the second ^:. Lower chamber can be solved. - · 3. Device according to claim 1 or 2, characterized P indicates that a rotating device is provided which the sub- ■ j The dividing device rotates between the operating positions if Ϊ the filter element in the first sub-chamber has a dirty '! · State, so that this then in the second sub-chamber,. and the filter element located there in the first sub-chamber to be turned around. '; 4. Device according to one of claims 1 to 3, characterized ^ characterized that a device responsive to the An f Changes in the operating positions of the subdivision device. -} . to purge the piston to create a reverse flow of the filter element located in the second sub-chamber j. actuated. ■. \ 5. Device according to one of claims 1 to 4, characterized characterized in that under the second sub-chamber a settling chamber for receiving the loosened from the filter element Sediment is provided. 10 9848/0602 6. Device according to one of claims 1 to 5, characterized in that a pressure chamber is provided above the second sub-chamber and this has an air outlet. 7. Device according to one of claims 1 to 6, characterized characterized in that the second sub-chamber with a sump is connected, in which the backwash flow generated by the piston leads. 8. Device according to one of claims 1 to 7, characterized characterized in that an annular wear plate in the housing is mounted, which resiliently urge into contact with the filter elements to seal the first sub-chamber from the second sub-chamber when the dividing device is in one of its rotational positions is located. 9. Device according to one of claims 1 to 8, characterized characterized in that a scanning device is provided which when the filter status of the filter element changes in the first sub-chamber transmitted a signal to which the dividing device is rotated. 10. Device according to one of claims 1 to 9, characterized characterized in that the filter elements are individually separable from the dividing device. 109848/0602 11, device according to one of claims 1 to 10, characterized characterized in that the filter elements are arranged on the subdivision The seal is mounted by a pair of elongated clips that are generally J-shaped in cross-section and are side-on Side are mounted that one of the clamps along the longitudinal edge of the filter element and the other clamp with its longitudinal edge is mounted on the subdivision structure and that a lengthwise Retaining clip having a generally C-shaped cross-section is provided for holding the pair of J-shaped clips together is. 12, device according to one of claims 1 to 11, characterized characterized in that the chamber is cylindrical in shape with a Axis which coincides with the axis of rotation of the dividing device and in that the dividing means comprises a generally planar wall part carrying wing parts which sealingly are in contact with the side walls of the inner chamber. 13, device according to one of claims 1 to 12w thereby characterized in that the subdivision means one between the first and the second filter element arranged wall and that the wing parts on the opposite Side edges of the wall are mounted, the chamber into the divide first and second subchamber. 109848/0602 14. Device according to one of claims 1 to 13, characterized characterized in that a plate in the chamber is resiliently urged into contact with the pilter elements to collect with the wing parts to prevent leakage from the first sub-chamber into the second sub-chamber when the dividing device is in an operating position. 15. Device according to one of claims 1 to 14, characterized M in that it is provided a plurality of sub-chambers with a corresponding plurality of Pilterelementen. 16. The device according to claim 15, characterized in that that the filter elements together form a cylinder. 17. Apparatus according to claim 15 and 16, characterized in that at least one filter element is arranged in the first sub-chamber and is used for filtering out. 18. Device according to one of claims Ibis 17, characterized characterized in that a connection from the inside of the filter element in the first sub-chamber to the pressure chamber is provided. ' 109848/0602 1786111 V M-O 19. "Device according to one of claims 1 to 18, characterized characterized in that a sensing device indicates the change in pressure of the medium caused by the filter element in the first Sub-chamber is effected at a predetermined contamination condition and that the device generates a signal. 20. Device according to one of claims 1 to 19, characterized in that the second sub-chamber has a second outlet which leads to the reservoir connected to the inlet for the transfer of the cleaning medium to the reservoir of the second sub-chamber. 21. The device according to claim 20, characterized in that a second filter is provided in the connecting line. 22. The apparatus according to claim 21, characterized in that the second filter consists of a permeable felt bag. 23. Device according to one of claims 20 to 22, characterized in that an inhibitor body in the line below the second sub-chamber is provided in order to reduce the energy of the pressure medium surge emanating from the pressure chamber. 1 0 9 8 U 8 / Q 6 0 7 ORIG ^ AL! NSPHCTEO 1786110 24. The device according to claim 23, characterized in that that a valve is provided and that a device closes the valve when the dividing device is between predetermined rotational positions is rotated to the connection interrupt between the second sub-chamber and the reservoir. 25. Device according to one of claims 1 to 24, characterized (t characterized in that a connection is provided from the pressure chamber to the point located downwards from the filter element in the first sub-chamber, so that filtered medium is introduced into the pressure chamber. 26. Device according to one of claims 1 to 25, characterized characterized in that medium is directed against the dirty side of the filter element through a nozzle when the Element from the first sub-chamber to the second sub-chamber is rotated and that a connection from the Abstronaseite of the Filter element in the first subchamber to the nozzle for Supply of medium is provided. 27. Device according to one of claims 1 to 26, characterized characterized in that a removable cover plate provides access to 109848/0602 _liÄ 1,786 113 ^€ Filter chamber allows to remove the filter elements individually. 28. The device according to claim 12, characterized in that that springs urge the wing elements resiliently against the side walls of the filter chamber. 29. The device according to claim 12 or 28, characterized in that the wings consist of a pair of similarly shaped Elements are made of which one is made of metal and the other is made of resilient material. 30. Device according to claim 28 or 29, characterized in that that the groove is wider than the total width of the two wing elements, so that the wings when rotating the dividing device can perform a tilting movement. 31. Device according to one of claims 28 to 30, characterized in that the grooves behind the passages Connect wings with the sub-chambers and that pressure-responsive devices are provided to the connection between the lower chamber, which has the higher pressure, and the grooves to open. 109848/0602 origjnal inspected 32. Apparatus according to claim 1, characterized in that the pressure-responsive device comprises a ball which located in the passage and its opposite sides exposed to the pressure in the opposite sub-chamber is. 33. Device according to one of claims Ibis 32, characterized characterized in that the housing has a removable cover over the inner chamber, that a wear plate provided between the partition and the cover and that the wear plate is urged downward against the dividing device with a predetermined force will* 34. Device according to one of claims 1 to 33, characterized in that the filter elements from a pair through ^ casual semi-cylindrical wall elements exist, the lengthways their side edges are connected to form a sleeve and that a flexible filter part is arranged in the sleeve, wherein Clamp the filter part detachably in the sleeve. 35. Device according to one of claims 1 to 34, characterized characterized in that a passage from the downstream side of the Filter element in the first chamber to the inside of the filter 109848/0602 178611. "": elements in the second, chamber leads and that a (pump is provided in the line to convey filtered medium from the first chamber to the second chamber. 36. Device according to one of claims 1 to 35, characterized characterized in that a pressure chamber is provided above the filter element in the second chamber, so that the liquid Air carried along by the inner chamber collects in the pressure chamber, 37. Apparatus according to claim 36, characterized in that an air release valve is provided which opens when the Fluid in the pressure chamber is under pressure and closes when no fluid flows through the filter device, so that a Emptying of the pressure chamber is prevented. 38. Device according to one of claims 1 to 37, characterized in that in addition to a settling chamber, a second outer settling chamber is provided, which is located outside and under the filter element arranged in the second chamber. 39. Device according to one of claims 1 to 38, characterized characterized in that a line for removing the accumulated 109848/060? ORlGiWAL INSPECTED 178611- Sediment is provided in the outer settling chamber and that a valve is provided to shut off the line, when the subdivision is in an intermediate position between the predetermined rotational positions. 40. Device according to one of claims 1 to 39, characterized characterized in that the two chambers are open to each other are when the subdivision is in an intermediate '^ position is between the predetermined rotational positions. 41. Device according to one of claims 1 to 40, characterized characterized in that the wear plate is surrounded by a seal is, so that the two sub-chambers are sealed from each other. 42. Apparatus according to claim 41, characterized in that, that of the chamber sections medium is guided between the chamber wall and the wear plate, so that this of the Pressure of the medium is balanced. 43. Apparatus according to claim 1, characterized in that the seal a groove in the wall opposite the closure plate comprises and that an elongated sealing element is arranged in the groove and comes into contact with the wear plate to a good Form a seal between the wall and the wear plate. 109848/060? 17861 44. Device according to one of claims 1 to 43, characterized characterized in that the subdivision device has a shaft which is mounted at its ends in sockets in the housing, that the bushing has an annular groove axially spaced from the chamber for collecting the leakage wipes of the bushing and the housing of one of the sub-chambers and that a passage for supplying the leakage fluid from the annular Groove to the second sub-chamber is available. ' 45. Apparatus according to claim 44, characterized in that the annular groove collects leakage fluid from the first chamber and that the second chamber has a settling chamber, a passage connecting the annular groove to the settling chamber. 109848/060 2 ORIGiNALITISPECTED Lee rse i te