DE1461446A1 - Filter arrangement - Google Patents

Description

. Walter αβπζ β monk »« * ?,

D ". D.ETIB MORF '' ™ £ 1 * Z

2-10

P 1 * 61 445. 1

New pads 1481446

$ 0 Sea Cliff Av "on # QXi" Cove, K.Y., V "3fc.Ä.

THEBOEIMOCOMPANY Seattle 24, Washington, V.St .A.

Filfcer arrangement

The invention relates to a primary filter assembly Fine filter with a secondary, preferably concentric to it Orobfilter element and with a pressure sensitive valve,. through which a partial flow flows to the secondary filter «

Such filters are used in hydraulic systems in aircraft used, ms an essential part of very fine, remove occasional particles

There are so many extraordinary arrangements made on the hydraulic systems of Flugseugen that it is surprising that failure does not occur again and again, but the systems are actually as effective as they are. The τβητβη- / Deten hydraulic Flüaeigkeiten "ÜBfen at Tenperaturen in" Qn rich - "on -55 ° C .- 135 ^g G" nd maacüwatal work even higher and sen under dleees ledingxongen fully flowable and operative

Sure wear and abrasion of the part, resulting in very fine tolls, which are usually less than 5 microns in diameter. Although these fine particles are so small that they are one do not cause clogging, but there is a risk that si / sh set these parts in areas in which the flow velocity siemlieh is low and that these furchen in the small play (often 5 microns or less) in snrvoventilen and collect in other components «. In the course of time I can even form serious clogging from such small particles. Indeed, it is usually these very fine particles that are responsible for is responsible for the failure of a valve in systems of the type mentioned there are such fine particles through the conventional filters never to be removed «In addition, there are parts of this Sraces that cause wear in pumps, there is only such small particles easily in the game "wipe the calibrated moving parts, a pump can penetrate"

Maintaining a pure hydraulic fluid requires effective filtration, of course. In this regard, the fine particles pose a particular problem as it is quite difficult to make a filter element which can remove very small particles and has sufficient flow capacity to cope with the flow conditions and requirements of plants in Plug seugen are met. During normal flight of a traffic mecha · »ne, for example the Boeing 72o, there occurs a flow of the hygienic liquid of about 20 liters per minute or less. on »but when the landing gear is to be operated, higher

90 9 816/0538 ß ^AD original

■ <■■■ Γ -:.: .-; -; . H614W

τοη ljjo liter (W der jutnuise en order- »Si · 3tremjn« ekapaeität a ·· Pil * «* · hangs in a netürlish τοη dt »Fliohentnhalt and τοη the KikroteilolMta-Vilterwlrkung from and for Ai * lined Rau * Terhaltnisee in aircraft is · ■ to ▼ he sear! Career time not been eBglioh, a filtereleaent se • ohftffen »for operation in hydraulic plants from Plug« • tight »« is extremely robust and an excellent performance for d »e user filtering of fine emerging parts has and aueeerdea * has an exceptionally booming flow capacity, beyond the ones mentioned

. . . -> ·. ■ Take conditions into account · The consequence of this is that ee * u- ■ indest In Flugseugen it was not possible to build a filter element * ■ it de »an essential part of very fine emerging parts

can be removed. '

¹ ■ - ■ - ■ · · · j.

The invention is based on the object of a filter arrangement su »ohaffvQ, old the a weeklioher part of the« Ehr fwihen resulting particles can be removed and preventive All particles formed with a diameter greater than three Microns can be removed and the one flow rate of the desired height without any real upper grease adt except for those that Helene through the herScöealiohen Piltereleaente currently in Oebrauoh is conditional »

This abandonment is done in accordance with the invention Pressure sensitive valve with an 8 port opening sue ttrlMiren Vlltereleaent gunasmsυ works that the printmaking Valve the flow sua secondary element independent voe clogging it releases "call that the piltering order suggested StrthsungrrolttBMn the Voluawi

6098U / 0S38 BAD ORIGINAL

c * ρ -m

2-104

exceeds that pass through the Strttsttngseffnung so that with an occurring increased flow volume, both filters are parallel. As a result of the design according to the invention, only a part of the airflow is filtered through the primary filter element at penetration speeds that are above a certain maximum value. The rest is filtered through the pressure sensitive valve. Sectoral filter guided by normal drainage capacity, which, however, can only remove most of the larger particles that are formed, preferably those particles with a diameter greater than IS Hikron. The normal flow, plus a safety margin, through the primary filter element is the maximum that is necessary for the normal operating flow in the system in which the element is installed. Only when extraordinary requirements are placed on the flow that go beyond this maximum, the flow control prevents the flow to be diverted to the secondary filter element. Since such extreme conditions are usually found during. If there are two rooms that are less than 5 % of the air flow rate, the filter arrangement according to the invention effectively keeps the hydraulic fluid essentially free of parts that are larger than they pass through the primary filter element, i.e. the parts above, which are shown in 41 * Fluid more exceptional during the time

enter »later during normal flow. / *. , '. ■

lines prJuNures and aecondary filter eleetats

(USA-Pjrtentsonrlft & ψ & 138). ^ doeh takes place in

4 V

SAD ORIGINAL

¹ U61U6

the known arrangement dl · connection of the second filter element la Oegenaat * with inventions Ulleea arrangement only then * when the arsta filter element is clogged and not depending on the flow constriction on the filter.

Sin more · Herta · *! Dar erftnduasjaaeai * aen filter arrangement is breathed in that there is a filtered stream because there are additional filter elements "Ent is maintained" when daa prlettra Eleeent is potted or so it affects that the flow is affected by a pressure drop to dleaeei filter element above a

In this! Viii · is the StrUmungsregelvorrichtung "" benfalla ice · Tfmleltung * r by daa secondary Pilt "leaent that flow causes which over the hinauegeht, lets through welohe fa%" partially or fully veratopfte prinäre Tilterelesent. Door the eekundäre Filtereleaent is a Second Uagehung baw, a bypass Torgeeehea "so that if this element is blocked or so disturbed that the pressure gradient through this gauge increases over a small test value _for the seed flow through the filter both the primary and the secondary filter element UJog goes horally there is ample time for maintenance after the primary leaent is clogged before the secondary fiI-terelaaent becomes clogged as well. Therefore, the wide bypass or bypass line only comes into operation in emergencies of a rather awkward nature.

Ka pressure diff © raman * edger can be provided, which then Achieving a certain pressure difference at the primary filter ₍

el »» ent and on the secondary filter element so that the loading

wecl »that df> e primary or -

809818/1131 bad original

U6U46

the secondary filter element or both oioh have clogged and • in »Require Maintenance.

To control the diversion of the liquid from the primary filter element at flow velocity above a certain maximum value as well as by diversion, if the primary filter material

■ ent clogged, so that the pressure difference em this one certain The minimum value obtained is intended as a precautionary execution forum the flow control device a combination of one StrÖBangB narrowing opening, soften the flow to a maximum value limited, and provided from a pressure sensitive valve, which is designed in such a way that by increasing the fluid pressure it » is actuated when the speed of the flow aunimat me filter assembly · you let flow through the opening limited to an EOohstwert because an increase in the flow over This HSehetwert also leads to an increase in the fluid pressure a leads, the pressure sensitive valve opens. Sa this increase Since the fluid pressure is proportional to the flow, the pressure sensitive valve responds to changes in the flow volume and thus to changes in the flow requirement, which in accordance with the invention * Filter arrangement is placed.

She mentioned opening let into the Strömongsleitung between the one-IaA rar filter assembly and the primary filter element and vorsug "- arranged in a EinlaSkanal while dae pressure-sensitive valve in the Strömungaleitung swischen inlaß the ^E and the secondary filter element is disposed.

Through the mentioned opening, the diameter of the becomes the flow

available kenals, for example in the inlet kacal, considerably

reduced, with the result that the flow through this begreaat will. The pressure-sensitive valve has. sweckmäsaig the form

90981 S / 0631 bad original

• la ·· f «d« rb «laet« th poppet valve · which can be moved back and forth between an opened and a closed position and whose liquid pressure is drained out in the inlet line. Since the valve is loaded in the closing division and remains stationary in a position in the event of a Tentileit, if the flow lies within the limit of the opening The force due to the fluid pressure at the inlet valve is less than that at which the valve opens, so that the valve stops and blows. Vans, however, da · Strdanng * YOlu * en «uniamt and dl · duroh dl ·« rvthnt · opening «raSffllont · b« green · StrSanng over- • ohr »it« t «doesn’t have a hat XInIaB au und üareohrtlt * t eohlleeiieh 41 · B «laetunf * Kraft ₍ v * loh« da · strives because · Taatil against dl · J5inlaB »tröeang geeohloeeen to halt ·». Da «valve. Is · ο trained, dafi · · Opens when the yieeeigkeitsdruek aa BLlow over eiaen started

Dft · ejruokeapfindUohe Trat 11 iet «o in the riüeeigkei te line, b «iepielevelse Is Sinlafikanal, arranged * dafi ·· under noraalen StrBsjongebondbedingungen a sun eecundiren Piltereleeent leading · Line re-closes. This has the effect that the flow is disturbed through the above-mentioned opening into the primary filter element eusso When the liquid pressure is on, the valve opens the inlet side of the pressure-sensitive valve whose minimum

-7-. «9816/0638

H61U6

Due to the fact that the flow requirements of the system are determined, the 4m valve is actuated so that the channel between the inlet and the secondary filter element is opened.

With a suitable choice of the spring loading force, which keeps the pressure-sensitive tent 11 closed, the opening amount can be proportional to the size of the fluid pressure, so that the sub-secondary element diverted flow rate can be made directly dependent on the stroke speed. Because the valve is open, the flow continues through the filter element ait the normal but maximum wind speed through the opening. Therefore, there is always a flow to the primary filter element and the flow remains unobstructed for a long time. In the case of currents at high winds that lie above the bed and the low values _f , a flow takes place both through the primary and through the secondary filter element. Sa

filter is therefore able to · »« me. eelbet the increased flow requirement aasupaeeen «whereby the seed flow through the filter assembly continues to be filtered.

Berorsugte Ausfühmngsforaen the erfindungegemäeeen flow rule Torrlohtung include an opening and a spring-actuated valve disc, who is charged against a side in one position let, in which it rerechlieet a line to the secondary filter element. Boron valve disk is the fluid pressure Ik inlet

-θ- 909 816/0638 bathroom original

Ssisi i

auegeaetst. With this, öffanae rorbiadet mentions the open-mindedness constantly old tat channel, which is primarily · »filter element« leads through dit Teder exercised on the valve disc · loading force kana in the required »ei» · by · a · suitable choice of the spring and the ρ «ηβ | adjusted while the size of the opening

d «r DxwÄkraft e * rthl *» i ^ d and di · Beaeaeo & e

de «riüeeigfceitadrttok aue« eeet * ten Tentiltellere is the Wtlee, that an acted tone de "druokeepfindliohen Yentiltellera at a" Jlüaei ^ c «ittdruck at the inlet he she It

Bai tilter bavorsa ^ tea Aturfffcnmgafors is a tfberdrtiok- or & tl & atoneBTaatil Tore «« eh «xxt daa batiti ^ fc will, irenn d« r keitedruok as BIiOeA the Sreek Ix channel sox secondary ülteoreleaeat on aax aadares 8ait «de» poriaSrea Illtertleeente «ι eise« the amount of ffeexeon rides. 9ahar is at the bevoanmete » AaeftShraseforBt watrn the fluid channel through the prisare Filtereleeeat is obstructed or tarstopft, eo that the Geeastdruokcatereohied swiacüesa de »Siaiad Canal and dta Canal mts ae- ■ Kuadaren Filt »rele» eot exceeds a bed load · & SSehetwert, because KntlÄBtung »Teatil operated what the Lei tuner stm eekuadlron ? ilt »releaent is released, eo that the prieiire Biaatttt and a filtered flow over the secondary

mtereleaent al »lotfall continues, ei« the priaare Pilteiraleaent can be serviced. Mesee Bötapaaaungrrentil can ta « ohe Tentil like the varattgehct & d besohriebeno pressure-sensitive Tentil

· *. 9Q9816 / Q53S _BA d ORiGiNAt

4 »

be til.

Yorsugswelae is also called “tr regulation” in spring-loaded poppet valve the mid-spam day flow around the secondary filter element, when this is so clogged or narrowed that the flow

is reduced.

Flow control device can be made of any permanent Material are made »that is inert to the liquid in circulation in the system, gate directions made of metal, for example aluminum, corrosion-resistant steel, or other corrosion-resistant alloys are preferred, but so is possible the device made of synthetic polymers and cellulose derivatives manufacture, such as polytetrafluoroethylene, polypropylene, Polyethylene, polystyrene, HyIon, Polyoxyethylene, Aerylnitrilkuteohuk and fluorocarbon-based elastomers or rubber *

The erfindungsgenjasse primary filter element is selected such that the -Anforderungen the plant for removing emerging Seilchen · As corresponds mentioned, hydraulic systems of aircraft Eugen removing all the resulting Feilchen require whose diameter is 3 microns. The particle filter performance of the primary filter element is not critical and can be in the range of o, o35 Io microns or higher depending on the parameters of the system,

BATH ORIGINAL

" _{L0_} 909816/0538

U6U46

IBr dae primary * filter element can «In any filter material Can be used in flat filter material become, ti «porous flat XiWvIaI μ» Bailer,! »« tarnish tmd file, "Lunstetoffmembranen" sintered particulate Material nad a wire mesh as well as a »Braid with sinter» & f u. d ^ l.i as in the üSA-iatenteohrifte Sr *

and 5,049,796 in which the grains or particles ana Metellen, ana natural Steffen or Kunetetoffen are, like korroeion »beet * adig * r steel, aluminum, 01a», keraaisohea Material, polyvinyl chloride, polyethylene, polypropylene, polyethylene and

Sa filter materials «it mtervaxsBeen for eoloh small particles j have a terhaMtniamfteeig low flow capacity »is ee Torso pulling, the prinire filter element in folds, convolutions or Corrugations on shapes »thus a large surface area for one small volume is obtained, ί

eecondary filter element is primarily used with consideration the StrSmnngskapasitftt chosen so that the maximum required Volume of liquid per unit of time at maximum flow rate * may pass through the facility, with the choice of Torsugsweiee is also made so that a filter line for eoloh smallest Particle is obtained than with such a flow capacity is achievable.

.11 »909816/0538 bad original

B-IoA .

Sit Tellohenfilterleletung d ·· aekundlren Filtereleaente 1st in none false critical and came la Berti oh from 3-5 © micron or higher yes Mob Ata parameters of the system are. Teilohen, which The structure stepped through the secondary filter element are, are located el A partwele · la of the plant, Jedooh is through da « prlaäre Piltereleaent nemalerwelee during the aomalta Btröaune 41 ··· Ton BOXohtn Tellohen

Wena Aas prairie Flltereleaeat au «elnea material is divided up

(beleplelewelee unified PolTer, never or paper) from which see Tellohea or Faeern τοη eelner unteretroaeeitlgen nttohe löeen The secondary rilttr “lmeat is pre-prepared to fine / AaS all individual parts or fibers are removed.

Ie gives eekundire supporters, what ale required flow capacity to have. Solohe Heaeat and from a wire braid tad aui elaea Brahtgefleoht old Siaterblldung produced »like -in Aaa TTSA Patent Ears Vr * 2 925 6 $ ό and 3,049,796 Ears, .as well as aas elnea wire braid old siater binding, the one surface layer from Metalltsilohen old 8interbindong has, like la of the VSA ~ Patentsohrlft Vr, 3.06I.917, furthermore fiI-tereleaent from fpslntertaa Metalltellohen useful, for example BlSOhO made of porous «corrosion-resistant steel and others corrosion-resistant alloys, bronze, aluminum and steel JsAss Aar Yorangehsnd sur application in primary elderly element

J ₁ ^ 909816/0538

BATH ORIGINAL

2-χοΑ : ■

besohriebeaen materials kum eueh for 4m secondary hltinl · · aent rerveadet "earth" Jedooh with eiaea larger pore darohmesssr, thus aar the larger particles formed because of the required grus »eren StrOnaaeakapasitgt« atf «advice« trden «

Sa «eekundAre filter element is also pre ^ eweiee ia! Old, Convolutions or furrows formed to create a larger surface ta fell.

In the enclosed newspapers aaigeat

Fig. 1 is a view through an erftaduagegemäeee lilteraaordaaag ia Laageaeanitt »« elohe dea Illterkopf and the FHtergetftfl as well as the aageordaetaa Slemeate seigti therein

Fig. 2 is a view of the filter arrangement shown in Fig. 1 in

; "■ / '■■. ■■ - ■

Section aaoh of the sharks 2-2 ia Wig * 1, seen ia Biohtuag dar arrows;

Fig. 3 nine series of the OefÄßteile shown in FIG Filter unit in Sohaitt aaeh of line 5-3, seen ia the direction of the arrows.

The filter unit shown in the drawings has iron Head 1, which is equipped with a threaded base 2 and an AualaBge

900816/0638 _B AD ORIGIN / i

Windeanachluß 3, in which suitable line connections can be screwed in, is provided ο The connection baw _D the opening 2 leads su an inner channel 4. Boring connection or * the opening 3 serves as an outlet for an inner channel 5i which extends laterally and then downwards au an opening 6 in the central part of the underside of the head 1 extends.

The flow control device is through an opening Io, which is on inner end of the channel 4 is provided, and the flow aua the channel 4> regulates the primary filter element and through a pressure-sensitive Valve 11 is formed, which is arranged in a socket 19 on one side of the channel 4 «Me opening Io opens on their inlet side into channel 4 of the head and on their out let it into the channel 7 of the head. The channel 7 first extends sideways and then downwards and leads to an opening 8 at the bottom of the head.

Ba * pressure-sensitive valve 11 has a spring-loaded valve plate 15 'of the close fit dor in the side walls of sleeve 19 Sitat and this against the action oiaer Druex "spring-back 13, the gegsn itself is vnfl reciprocally movable, supporting the averted end of the sleeve. In When the valve 3 is in the closed position, the plate 15 rests against a valve seat 2o. A flange 21 in the channel 4 holds the valve plate in the socket 19 * The entry of liquid from the channel 4 into the channel 16 is therefore normal.

-14 »909816/0538 bad original

H6H46

4t

duroh the valve disk 15 prevented when you see this in Miner base & position in contact with the valve flange 21. When the Tentllteller 15 ▼ <»Ventileit« Eo is moved away the channel 16 «or flow τοη liquid moe de · inlet channel 4 through the K »ml 16» ur opening 17 on the underside of the «head« opened.

The head 1 is old Onea »loh trained downwardly extending bargain 88" of the old one after take protruding ^L ippe 29Ter- ■ "hen 1st" medium to which "in flltergefäfl 30" a "T" cross- • ohnittföraigeE gLeaarttig "31 and "Ines ümeohlieesttngeringe" 32 is browned, "o that the filter-filled head can be separated. Between the outwardly young upper lip 35 of the filter vessel and the lower side of the lip 29, a more flexible seal is provided in the form of a "sealing ring" 34 "

Ia Oefftfl 30 "ind" in primary "filter element 40 and a secondary" Filter element 50 arranged. The filter element shown in the drawing 4o works on a suctioned filter material, i.e. on Epoxy resin-impregnated cellulose paper made · The material has a wavy shape. " as best from Fig. 3 is borrowed " The corrugations are supported both on the inside and on the outside Approved by cylindrical perforated bleoh cores, such as Aluminum or corrosion-resistant steel, with the inner with 41 and the outer cover with 42 is designated.

_ ₁₅ _ 909816/0538

Dae corrugated material dee primary filter elements, the core and the cover «ground through a top end cap 43 and through a lower end cap 44 held assembled. Jedo of the end caps 43s and 44 let a bit opening 43 or 45 'be provided. On the inner circumference each end cap is located close to the central opening Parts 46 and 47 that ait the end caps feat connected and outward e as well as are bent on the side to form flutes with the caps, in which calibrated sealing rings 48 and 49 are located.

The opening in the lower end cap 44 is through a bottom cap 60 closed. The cap 60 has an upwardly extending calibration and again surttok-curved part 61 is formed, which with narrow ? aeeung sits in the opening of the end cap 44 and on the inner circumference the end cap and the inner parts 47 are in contact. A leaky seal with the cap 60 is formed by the sighting ring 49 »

The cap 60 is sealed in the opening 45 'by an end plate 62, the circumference of which extends beyond the opening 45' in the end cap, the cap 60 and the plate 62 being firmly connected to one another by a rivet 64. The lower flange 63 of the rivet 64 holds a spring 66, the other end of which is supported against the base 67 of the vessel Jo.

The head 1 is provided with a second inner, downwardly directed tubular

r

shaped extension 35, over which the opening 45 in

the top end cap 45 fits and the sealing ring 40 forms one

9Q981S / 0S38

-IAT- BATH ORIGINAL

H61U6

g-loA ¹

The sealing of the end cap and the head part is always secure. The spring 66 with the bottom of the container holds the cap 43 and thus the primary filter element 40 against the head therefore delimit a roughness between them directly on the inside of the wall of the vessel. The opening θ dee head 1 opens into this tree, whose former exit, however, exists via the filter element 40. Bieraue shows that through the inlet 2, the channels 4 and 1 and the channel θ dee head "in the chew" 70 entering liquid from the vessel 3o can only escape "that it dxuroh the cover 42" da. Pria * re filter element 40 and core 41 pass through in succession.

! tee asktt & d & re filter element 50 iet kon «« ntriooh within dee ~ T, Inner cores 4I arranged at a distance from this "eo that a house" 71 wipe the Ααβ mustard Iac he dee eekuadiLren filter elements and the core 4I is turned. The channel 17 dea head flows into there Sofia 3o immediately above room 71. Dae secondary filter element What is a sintered wire mesh on * dae after the USl-P & Tanteohrifte 2,925 * 650 and 3,049,796 is manufactured and has a surface made of fine metal powder with a sintered bond according to U3A patent specification 3.06I.917. In this case both The sintered wire mesh as well as the metal powder from corroelccisbestllndlgta Steel made, the secondary filter element, & «C *: e« föll »a wanted * Foria hsit, is perforated by a

■ "a0S816 / 0638 bad original

~ 1 | -

1A6U46

Metal cylinder core 51 atm aluminum or corrosion-resistant Steel is held and this structure is set together with the upper and lower end cap 52 bxv. 53 using the Method and arrangement according to U.S. Patents 3,007,579 and 3,007,238 welded or brazed. The lower end cap 53 is closed. The top end cap 52 has a central opening 55 «if and is at this opening to form a groove 56 after bent inside, in which a sealing ring 57 is arranged, the "it seals the underside 36 of the extension 35 of the head 1" you in the middle opening of the end cap 44 of the primary Filter element inserted bottom cap 60 holds the secondary element 50 in the right position alt Besug on the head 1 and the Channel 6.

Between the ^ aum bsw. Channel 71 and channel 5 is an expansion valve assembly provided, which is arranged in a recess So of the braid and has a valve disk 61 above the house 71 in a channel 05 leading to all channel 5. The valve is against a viewing surface 63 by a compression spring 62 loaded in channel 85. The valve seals against the seat surface at the lower end of the recess 80.

The valve disk 81 is normally in the position shown, in which it closes the channel 85, so that the structure 72 within the secondary filter element 5o, the channel 6 uxd de?

-18- 8ü £ 616 / QS3ß ^EÄD original

U61US

Austrlttskanal 5 YÖllig τθη des Eau »71 completed and the entry of the egg into these rages only through the secondary Filter element Jo can be done. If the tension valve Sl closed, liquid flows out of the primary filter element 4e «m the exit channel 5 and the exit opening 3 in the head 1 s, through space 71 and through the secondary filter element 5o in the building 72. When you see the tilt plate 81 from his Sits at the Diohtungafläohe 83 moved away what with 'a starry man Pressure difference aa secondary filter element $ o between the rough 71 and the tree 72 happens, a leg opens immediately in the channel 5 »* o & * & äi · flow now bypassing the secondary filter element »Jjo sum luslaßansohluß 3 in head 1 maintained will. This flow is an unfiltered flow and only finds in the case of emergency.

On the bottom wall $ 7 of the filter vessel 3c there is a drain opening 9 ° I ▼ provided, which can be opened by turning a hexagon nut 91 can. This way you can when expanding the vessel For killing the filter elements 4o and 5o or other parts of the Filter unit is required to drain the liquid from the vessel the Y-shaped clamping ring 31 and the ring J2 * be removed.

There are also two pressure indicators in head 1 _: loo and lol Torgeeehen. Dru ^ kanseiger arbaiton vürsuRsweisa with magnetic effect,

..19. 90-9819 / 0531 bad original

H6K46

see Ib of U.S. Patent Specification 2.942 * 572. The Anseiger loo let daroh «in« line loj ait dta channel 16 la head on the other Since the opening Io connected and through a channel Io2 old dea Blnlafikanal 4 de · heads · and serves duvrj, a pressure difference zwieohtn the channels 4 and 16, '2s over a certain Huohetwert goes beyond. Oa with normal operation of channel 4 via the Channel 7 ia head immediately ait des Baua 7ο at the unfiltered The filter element 40 is connected to the side and the channel 16 immediately ait dea Baua 71 on the other side of the primary Let filter elements 40 connected, the Druokanseiger loo den Draokuntereohled aa primary filter element 40 an »Ton dea Druokanseiger Therefore, a 'signal is generally issued when the mentioned Submitted to the primary operator 1st what is indicated that this fllterelemeat clogged or narrowed eo far, that the flow through the- • ee «Nter a certain minimum value drops.

»He Oruofcanselger lol let duroh a channel I05 with the room 71 ia OefäA and duroh a channel 6 old dea Auelaekanal 5 ia head connected It therefore always emits a signal when a certain minimum pressure level exceeds these two channels been let. Oer channel 5 is located on the outlet side of the secondary Filter elements 5o, while the Baua 71 is on the top of the electrone dee secondary ileaents are located. The inseiger lol therefore enters Lamsaiohen off when calibrates the secondary filter element clogged. if

909818/05 3 8 ^{EAD 0E?! G!}

. ■ ■ if "..

di «e soled, kana der firuokunteraehled an dleeen den Hart errelohen, at which the island lol is pressed before dar Sruokuntereohled reaches the Vert, at» elebe »daa Entapananngs * ▼ entll 81 is opened, ao da * der Anselger nor the Yora potting dea secondary filter elements 5o and was τογ the reflection of the mostly unfiltered flow.

lue de "Torangehen he" just aion the Teraohiedenen ways of the ttüealefceit dnroh the filter unit under the βίοη changing str6n «u ^ p§eeob.windigcelt in the system _β fforaalerweiee occurs with all 3trfl» wagageaoh «lndlgtoiten below 2 beaohaplavewertBe 1 / nin. The liquid filtering through the filter unit through the inlet 2 takes its way through the channel 4 1> head and then through the opening sun channel 7 ia head »ana velehea ale through the opening 8 in the building 7o awiaohen Auaaenaelte dea priattren filterelenenta and the inner wall dea ßeffteeee 3o arrives · Then it niomt its way through the Saaaere cover 72 dea primary 7ilterelenenta ₉ daa primary filter element Ao and the inner core Al, first in the tree 71 before the primary and the secondary filter element appear Aneehlieaend the liquid takes its way through the secondary filter element 5o and the core 51 in the tree 72, which is extended to the secondary filter element, and emerges from the opening 6 through the opening 6 into the access channel 5 in the head, ao daft all the filter unit at the outlet connection 5

- ^a - 909816/0538 ^BA

runs.

Since the primary filter element 40 removes the small particles and the filter element removes only the larger particles, terura the secondary filter element in this normal flow no effective surface filtering effect. Ea can, however, be a Migration of material from the primary filter element 40 can have solved »prevent

The filter unit therefore works with the normal flow their maximum telecommunication filtering performance, so that no particles which have a diameter of about 3 microns, for example pass through the filter unit. This effective operation is certain at all normal flow rates below that mentioned Maximum value he sielt at which the pressure-sensitive valve 11 is actuated.

If a higher flow capacity is required in the system, the pumps naturally cause a stronger flow of the liquid and take the. Flow rate of the liquid to the filter unit at AnsohluB 2 au. When the flow rate in the If the filter unit decreases, the flow capacity is restricted reached through the opening Io, which has the consequence that the fluid pressure decreases to the level at which it is pressure-sensitive Tentil 11 is opened, and the Tentilteller I5 tob Sits 2o am Sttd «of the socket I9 is lifted, so that the channel 16 for the FlOs-

.22- 909816/0538

BATH ORIGINAL

• l4iMltMtr «auag is exposed, ftan 41 ·· seen, BlMt 41 · flow Inrea Yerlaaf through dl · opening Io alt the noraalen To-IaMB TM example ·» *! ·· 2o i / aia .. Da du StreauagsTOluaen, 4m duroh the uffaaag Io himdurohgang IcMa ₁ duroh their dimensions let, BiMt 41 · Excess fluid flow Their leg duroh the channel 16 «a4 emerges from the head M channel 17. The channel 17 la topf let unalit «lb« r 4m Rwm Jl ewieohtn d «a prlaftr» and 4 «a MkM4ir« B? Llt # r * l * e «nt so« «k« hrt _f so that 41 · flb # recbüe§l- g · StTMttaf 4m prlafr · tllttr * lea «nt 40 bypasses and only duroh 4m •• kuttdtr · llit« r «lM« at 5o hlndurohtritt «In dtn duroh 4m fllttr- • lMMt · 1η # ·· υα1οββ The channel 72 emerges and then 4 m 30 through the opening 6 and 4 "a outlet channel 5 nrlttt. Yes 41 ··· * StrOaonc is al «erflndlloh old 4« r stfilttrten StrOauaf Ttralaoht »41 · still through 4m primary filter element 40 hladurohritt. The duroh 41 · filter unit of the system mgeiOhrt · f9.ll · · ■ igkeit a «t« loh laaaaaM at · the nüBalgkeitt 41 · durolt 4m primary filter element hlnduroht and therefore vlrkeam τοη free all particles that “Dorohneseer is more than 3 microns , μ as from the StrSauag, which only passes through the secondary filter element and only stripped off the parts which, for example, have a durometer greater than 15 microns. For the system there is a steady flow for a considerable period of time, but of course this flow lasts only as long as there is this over-solitary flow requirement in the system. As soon as this need for fuel ceases, mnd ^

.23-909 816/0538 &quot; ^ ₀ original

the Flüealgkeiteroluaen as well as Al · flow velocity again become normal, the Druok takes the opening Io accordingly away. The fluid pressure ia channel 4 also decreases and becomes normal. When the fluid pressure has decreased below the value has at which calibration daa pressure-sensitive valve 11 opens, returns dae Yentil on its seats 2o aa end of the socket 19 under the pressure of the spring 15 «urüok. The channel 16 at the head is therefore opened up so that any flow djle the primary filter element bypasses, stops. The filtered flow is therefore subject to the action of the primary filter elements 40 and all of them Particles in the system that have a durometer greater than 3 microns have removed «. As the camouflaged liquid in the plant circulates, sohlieSlioh returned to the primary filter element particles that have passed through the secondary filter element will be, since they are smaller than those through this distant part of the ear, i.e. having a part of the height, those within dta ranges τοη 15 microns down to xu 3 microns lies, out of the liquid by the action of the primary filter elements removed. The presence of such fouls in the fluid is therefore only permissible during the period of the excess Current demand "

In the course of using the filter element, if the amount of the material removed by the primary filter element, obstructs flow through that element. When this happens takes the fluid pressure on the valve disk 15 at the inlet

-24- 9 O 9 8 1 ß / O 5 3 8 _B ad original

H6U46

flee information of the reduction in flow volume through and on the other hand the primary filter elements lead to ο this A corresponding increase in the pitch difference on the valve 11 «between the channel 4 and the channel 16, which via the channel 17 ait des Raus? 1 smell the primary and the secondary filter element communicates "Finally the fluid pressure will exceed or the force »which is exerted on the valve disk 15, the mentioned certain value at which "the valve disk 15 opens, so that the latter from its seat 2o against the action of the spring 1? is lifted, whereby the channel 16 is released for the flow of liquid. If necessary, the spring 1? be adjusted so that the opening amount of the valve of the liquid pressure can be proportional to the valve disc. You can flow through d & a primary filter element, therefore for a period » which is as long as mJSglioh, continue until it is completely clogged is «At this point or knra beror will be the valve then fully open, eo that the entire flow through the secondary

■ # ■ Filter element binding passage. VI · t at this point in time, mx «la part of the flow passes through it, but a sufficient part to maintain the required flow volume for the outlet.

Is the blockage of the primary filter element 40 and the corresponding pressure relief, which in the channel 15 with the help of the pressure "taatverbindttngezv Io2 xted Io5 on each suit"? des Eruokdifferen «.

- «- 909816 / 0S38 bad original

U61U6

anaeigers loo can be observed, this change in pressure is detected between channels 4 and 16 by the insider, who, if there is a pressure difference, indicates the “point in time or, as a predictive, briefly gate of the point in time” at which the valve opens to release channel 16, that the primary filter element is rare. The operator is therefore notified of the state that requires his attention or the time at which the secondary filter element takes effect, bypassing the primary filter element. The pressure di: \ f izerz anseifar loo is preferably so - set, äa3 the Sigca? is given continuously until the next unit is serviced, since it is important that the flow around the primary filter element is not maintained for a longer period of time than is absolutely necessary.

The flow through the secondary filter element 5 <j in the barely 72 continues until the secondary filter element rerstopft. If this unlikely event 81 forms the valve head a bypass around the secondary filter element 5o around "Ba the secondary filter element 5o by the Herausfiltes-n d" v impurities rerstopft, the pressure difference niaat swisehen H & umon 71 and 72, until he finally reaches the point at which the valve disk 31 is lifted from its seat 83, whereby the kenal 85 3 is released as "in these two fences" immediately before the pressure is applied

9OSB18 / 063 8 * «>« «am.

H61U6

w & rd dtr lfentokaatersohied as well as in Besi 71 f who is now directly ait dta channel 4 is head in Terlinden «, and dta Baua 72, which tint directly · ytrbinding old dta lana! 5 la head has, duroh dtn Xkruokanseigcr lol determined, wtlobtr dlrtktt has connection ttbtr dta channel Io5 and dta channel I06. St is therefore at tlnta Sruokaattrtohied unaitttlbar tot dea Druokuntereohied, which aua Offnta da "Vtntiltellert 81 is required, given a signal, Sit Btditsuagtptreon aitht sun dit signals of _a two Dtuoltan-Miftr loo and both are therefore required" Filttrtltaente the filter installation out of operation tiad, to daf dit Wavtnae dtr Uahtit uabtdiaft required, if the hrdrauliaoht Aala «e satisfiedetelltfid continue to work great.

Although the Toranethttrlauf is old berormifted bttraohtet , the same function can of course also be obtained with the change of other egg directions. Bai * tpitltwtitt ktenen mdtre herkSaaliohe types dtr Str «Bangartgel- ▼ orriohtung ait direct actuation · vait actuation the turn of the day of the day can be used.

BATH

»27-90081 670639

Claims (1)

! . U6U46; . J Ik β! 446, 1 «# September 25, 1968 PaU Corporation iw 2-lOV? 55 3 * 3, oh 1. filter arrangement with a primary fine filter, a sugswsise tesa koneentriechen eekunflarcn Grotfilterelenent and with a pressure-sensitive Tentil.duroh there Teiletroo to the secondary filter flieaet, dadureh kennselohnet, dtee da «pressure-sensitive Yentil (11) with a The flow opening (1O) acts on the primary filter element (40) daes dae druekompfindliohe Yentil (11) die Flow aum secondary rilterelemont (50) independent rom ▼ eretopfungeBuetand deeeelben releases when there «he Iilteranprdnunfi BugefUtuiert flow volume the volume tttoereehreit, dae through the opening (10) " can pass through, so that there is an occurring increased StrÖÄungerolueen both filters are parallel. 2 · filter arrangement according to claim 1 ₉ characterized by a BntspanttneaTentil (8I) ₉ which is set so that there is a correct pressure difference in the secondary TiI- tersleaent (50) Opens so that the latter is bypassed » when it becomes clogged and the pressure difference across that Exceeds the specified value mentioned. BATH U61446 3 · Pllter € knordnting according to claim. 2 »characterized in that the entepaanungo valve is in the form of a spring-loaded« »plate valve oat« 4 · Filtaranordiring according to claim 1, characterized in that » that the primary filter element is a toilet filter up to a maximum of 5 Elürron and the basic Pilterelömeat oine Sellcheafliter3. solid to peak 15 microns » 5 * .Filter arrangement according to requirement. 1, thereby that the primary Pilxcroleoent from iiarziiapr & gniertea pier and the eekund & rö filter element made from one Braht mesh is divided into a surface Aue you tall particles in S int inheritance ait this s has. 6 * Pilot arrangement according to Anepariicii 1 »identified through a back-to-back agreement and report of a Sruekuöteraekledes at the prinärea batr. ijekandären? il ~ the higher air? a beötJbuotex · minimum value ORIGINAL