FI90829C

FI90829C - A filtering device

Info

Publication number: FI90829C
Application number: FI930082A
Authority: FI
Inventors: Timo Virtanen
Original assignee: Timo Virtanen; Virtanen Lasse
Priority date: 1993-01-08
Filing date: 1993-01-08
Publication date: 1994-04-11
Also published as: FI90829B; FI930082A0

Description

90829 i90829 i

SUODATINLAITEFILTER DEVICE

Keksinnon kohteena on patenttivaatimuksen 1 johdanto-osassa mååritelty suodatinlaite.The invention relates to a filter device as defined in the preamble of claim 1.

5 Entuudestaan tunnetaan suodatinlaitteita ve- sialuksessa moottorin meri- tai makeavesijaahdytysveden suodattamiseksi avoimessa jåahdytysvesikierrossa. Tyy-pilliseen suodatinlaitteeseen kuuluu suodatinkotelo, jonka sisålla on tulotila ja poistotila. Suodatinlait-10 teeseen kuuluu edelleen tuloyhde jaahdytysveden johta-miseksl tulotilaan, poistoyhde jaahdytysveden johta-miseksi poistotilasta ulos, suodatin, esim sihti, auk-kolevy tai sen tapainen, joka on jårjestetty suodatin-kotelon sisaån tulotilan ja poistotilan vålille jåahdy-15 tysveden suodattamiseksi ja puhdistusyhde, jonka suu-aukko on suodattimen laheisyydessa. Jåahdytysvesikier-toon kuuluu lisaksi vesipumppu jaahdytysveden virtauk-sen aikaansaamiseksi suodatinlaitteen lapi. Avoimessa jaahdytysvesikierrossa jåahdytysvesi otetaan suoraan 20 siita vesielementista, meresta, joesta, jårvestå/ jossa alusta kåytetåan siten, ettå aluksen pohjassa olevan siivilan lapi imetaan vettå suodatinlaitteen lapi ja johdetaan edelleen moottorin lauhdutusvedeksi, mistå vesi sitten poistetaan takaisin vesistoon.Filter devices are already known on a watercraft for filtering engine seawater or freshwater cooling water in an open cooling water circuit. A typical filter device includes a filter housing with an inlet space and an outlet space inside. The filter device 10 further includes an inlet connection for conducting cooling water to the inlet space, an outlet connection for conducting cooling water out of the outlet space, a filter, e.g. a sieve, an orifice plate or the like arranged inside the filter housing between the inlet space and the outlet space. a cleaning connection with an orifice in the vicinity of the filter. The cooling water circuit further includes a water pump to provide a flow of cooling water through the filter device. In the open cooling water circuit, the cooling water is taken directly from the water element, sea, river, lake / where the vessel is operated by sucking the water through the strainer at the bottom of the vessel and passing it back to the engine condensing water.

25 Ongelmana entuudestaan tunnetuissa suodatin- laitteissa on, etta ne pyrkivat helposti tukkeutumaan jaån, sohjon, yhdyskuntajåtteiden, merilevån yms sel-laisen veden pinnalla kelluvan aineksen joutuessa suodatinlaitteeseen. Toistuvaa tukkeutumista tapahtuu 30 yleisesti varsinkin silloin, kun suodatinlaite on asen-nettu pienen syvåyksen omaavaan alukseen, jossa veden-otto tapahtuu veden pinnan låheisyydesta.A problem with the previously known filter devices is that they tend to easily become clogged when frost, sludge, municipal waste, seaweed and the like floating on the surface of the water enter the filter device. Repeated clogging generally occurs, especially when the filter device is installed in a shallow vessel, where water intake occurs from the vicinity of the water surface.

Edelleen ongelmana tunnetussa suodatinlait-teessa on, etta tukkeutumisen tapahduttua suodatinlaite 35 joudutaan puhdistamaan kåsityona, rnika on hankalaa ja aikaavievåå.A further problem with the known filter device is that after clogging has occurred, the filter device 35 has to be cleaned by hand, which is cumbersome and time-consuming.

Keksinnon tarkoituksena on poistaa edella 2 mainitut epakohdat.The object of the invention is to eliminate the above-mentioned drawbacks.

Erityisesti keksinnon tarkoituksena on tuoda esiin suodatinlaite, joka puhdistuu tukkeutumistilan-teessa automaattisesti ilman, etta sita joudutaan avaa-5 maan ja puhdistamaan kasityonå.In particular, it is an object of the invention to provide a filter device which is automatically cleaned in a clogging situation without having to be opened and cleaned by hand.

Keksinnon mukaiselle suodatinlaitteelle on tunnusomaista se, mita on esitetty patenttivaatimukses-sa 1.The filter device according to the invention is characterized by what is stated in claim 1.

Keksinnon mukaisesti puhdistusyhteen sisåan on 10 jårjestetty alipaine, ja valineet, joilla virtausyhteys tulotilasta puhdistusyhteeseen on olennaisesti suljet-tavissa veden virratessa esteetta suodattimen låpi ja joilla valineilla virtausyhteys on olennaisesti avatta-vissa suodattimen tukkeutumistilanteessa alipaineen 15 kasvaessa poistotilassa vesipumpun toiminnan vaikutuk-sesta, jolloin suodatinta tukkiva aine poistuu suodat-timesta puhdistusyhteeseen siina vallitsevan alipaineen avulla.According to the invention, a vacuum is arranged inside the cleaning connection, and means with which the flow connection from the inlet to the cleaning connection can be substantially closed when water flows unobstructed through the filter and with which the flow connection can be substantially opened in the the substance exits the filter into the cleaning connection by means of the vacuum prevailing therein.

Keksinnon etuna on, etta suodatinlaite puhdis-20 tuu tarvittaessa tukkeutumistilanteessa automaattisesti ilman, etta sita joudutaan kasityonå avaamaan ja puhdistamaan .The advantage of the invention is that the filter device is automatically cleaned in the event of a blockage, if necessary, without having to be opened and cleaned by hand.

Suodatinlaitteen erååsså sovellutuksessa suodattimeen kuuluu sihtilevy, joka on reunastaan ni-25 velletty kååntyvåksi suodatinkotelon suhteen ja jonka sihtilevyn vapaaseen reunaan on jårjestetty sulkuelin puhdistusyhteen sulkemista vårten; suodatinlaitteeseen kuuluu jousilaite sihtilevyn pitåmiseksi ennalta måå-råtysså asennossa sihtilevyn ollessa låpåisevåsså ti-30 lassa; ja valineet virtausyhteyden sulkemiseksi ja avaamiseksi puhdistusyhteeseen koostuvat mainitusta nivelletystå sihtilevystå, jousilaitteesta ja sulkueli-mestå.In one embodiment of the filter device, the filter comprises a screen plate which is pivoted at its edge so as to pivot relative to the filter housing and in which a closing member is arranged at the free edge of the screen plate for closing the cleaning connection; the filter device includes a spring device for holding the screen plate in a predetermined position with the screen plate in a transparent t-30; and means for closing and opening the flow connection to the cleaning connection consist of said articulated screen plate, a spring device and a closing member.

Suodatinlaitteen erååsså sovellutuksessa 35 sihtilevy on normaalissa suodatusasennossa olennaisesti vaakasuorassa tasossa ja puhdistusasennossa sihtilevy on poikkeutettuna nivelpisteenså ympåri kulmaan vaa-In one embodiment of the filter device, the screen plate 35 is in a substantially horizontal plane in the normal filtration position and in the cleaning position the screen plate is deflected at its articulation point around an angle.

IIII

90829 3 kasuorasta tasosta alaspåin.90829 From 3 straight levels down.

Suodatinlaitteen erååsså sovellutuksessa puh-distusyhteen suuaukon ylåreuna on olennaisesti samassa tasossa tuloyhteen suuaukon alareunan kanssa; ja sul-5 kuelin on yhdistetty jåykåsti sihtilevyn vapaaseen reunaan ulottumaan sihtilevyn tasosta alaspain.In one embodiment of the filter device, the upper edge of the mouth of the cleaning connection is substantially flush with the lower edge of the mouth of the inlet connection; and the sul-5 ball member is rigidly connected to the free edge of the screen plate to extend downward from the plane of the screen plate.

Suodatinlaitteen eraasså sovellutuksessa suo-dattimeen kuuluu sihtilevy, joka on kiinnitetty irro-tettavasti suodatinkotelon sisåån; vålineisiin, joilla 10 virtausyhteys tulotilasta puhdistusyhteeseen on avatta-vissa ja suljettavissa, kuuluu paineilmaisin, joka on jårjestetty ilmaisemaan poistotilan paineen muutoksen sihtilevyn tukkeutuessa, sulkuventtiili, joka on jårjestetty sulkemaan ja avaamaan virtausyhteys tulotilas-15 ta puhdistusyhteeseen, ja ohjauslaite, joka on jårjestetty avaamaan ja sulkemaan sulkuventtiiliå paineil-maisimen antaman tiedon perusteella.In one embodiment of the filter device, the filter includes a screen plate releasably mounted within the filter housing; means for opening and closing the flow connection from the inlet to the cleaning connection include a pressure detector arranged to indicate a change in outlet pressure when the screen plate becomes clogged, a shut-off valve arranged to close and open the flow connection to and from the cleaning connection, to close the shut-off valve on the basis of the information provided by the pressure sensor.

Suodatinlaitteen erååsså sovellutuksessa suo-datinlaitteeseen kuuluu imulaite alipaineen aikaansaa-20 miseksi puhdistusyhteeseen.In one embodiment of the filter device, the filter device includes a suction device for applying a vacuum to the cleaning connection.

Suodatinlaitteen erååsså sovellutuksessa imu-laitteeseen kuuluu imuputki, jonka ensimmåinen påå on yhdistetty puhdistusyhteeseen ja toinen påå on pako-kaasukanavan sisållå imuputken påån ollessa suunnattu 25 pakokaasujen virtaussuuntaan.In one embodiment of the filter device, the suction device comprises a suction pipe, the first end of which is connected to the cleaning connection and the other end of which is inside the exhaust gas duct, the end of the suction pipe being directed in the flow direction of the exhaust gases.

Seuraavassa keksintoå selostetaan yksityiskoh-taisesti viittaamalla oheiseen piirustukseen, jossa kuva 1 esittåå kaaviomaisesti keksinnon mu-kaisen suodatinlaitteen eråstå sovellutusta eråine 30 ympåryslaitteineen normaalissa kåyttotilanteessa, kuvat la ja lb esittåvåt leikkauksia kuvasta 1/ kuva 2 esittåå kuvan 1 suodatinlaitetta puh-distustilanteessa, 35 kuva 3 esittåå kaaviomaisesti keksinnon mukai- sen laitteen erååseen toiseen sovellutukseen kuuluvaa imulaitetta alipaineen muodostamiseksi puhdistusyhtee- 4 seen, ja kuva 4 esittåa kaaviomaisesti keksinnon mu-kaisen suodatinlaitteen erasta kolmatta sovellutusta.The invention will now be described in detail with reference to the accompanying drawing, in which Figure 1 schematically shows an embodiment of a filter device according to the invention with a device 30 in normal use, Figures 1a and 1b show sections of Figure 1 / Figure 2 schematically shows a suction device belonging to another embodiment of the device according to the invention for creating a vacuum in the cleaning connection, and Fig. 4 schematically shows a third embodiment of a filter device according to the invention.

Kuvassa 1 on suodatinlaite, joka on tarkoitet-5 tu asennettavaksi vesialuksen moottorin avoimeen meri- vesi- tai makeavesijaahdytyksen jååhdytysvesikiertoon suodattamaan jååhdytysvettå, joka otetaan aluksen poh-jaan asennetun siivilån 18 lavitse suoraan meresta tai jårvestå suodatinlaitteen låpi ja johdetaan edelleen 10 moottorin jååhdytystarkoituksiin (ei esitetty tarkem- min). Jaahdytysveden virtaus suodatinlaitteen lapi aikaansaadaan vesipumpulla 7, joka on jårjestetty vir-taussuunnassa suodatinlaitteen jålkeen. Suodatinlait-teeseen kuuluu suodatinkotelo 1, jonka sisållå on tulo-15 tila 2 ja poistotila 3. Suodatinkotelo on edullisesti laatikkomainen suorakulmainen suuntaissårmio, kuten pienennetyistå leikkauskuvista la ja lb kuvasta 1 ilme-nee.Figure 1 shows a filter device for installation in an open sea, water or fresh water cooling cooling water circuit of a watercraft engine to filter cooling water taken through a strainer 18 mounted on the bottom of the ship directly from the sea or further through the filter device. more precisely). The flow of cooling water through the filter device is provided by a water pump 7 arranged in the flow direction after the filter device. The filter device comprises a filter housing 1, in which there is an inlet-15 space 2 and an outlet space 3. The filter housing is preferably a box-shaped rectangular parallelepiped, as shown in the reduced sectional views 1a and 1b in Figure 1.

Jååhdytysvesi tulee tulotilaan 2 tuloyhteen 4 20 kautta. Jååhdytysvesi puolestaan poistuu suodatinlait- teesta poistoyhteen 5 kautta. Suodatin 6 on jårjestetty suodatinkotelon sisåån tulotilan 2 ja poistotilan 3 vålille. Suodattimeen jååvåt vedesså olevat kiinteåt ainekset, kuten jåå, sohjo, yhdyskuntajåtteet, leva 25 yms. Suodatinlaitteeseen kuuluu edelleen puhdistusyhde 8, jonka suuaukko on suodattimen 6 låheisyydesså. Puh-distusyhteen 8 sisåån on jårjestetty jatkuva alipaine jollakin sopivalla tavalla, josta esimerkki kuvassa 3. Suodatinlaitteeseen kuuluu edelleen avattava ja sul-30 jettava suljinelin 10, jolla virtausyhteys tulotilasta 2 puhdistusyhteeseen 8 on avattavissa ja suljettavissa. Suodatinlaitteeseen kuuluu edelleen vålineet suljineli-men 8 sulkemiseksi sekå avaamiseksi tarvittaessa aina suodattimen tukkeutumistilanteessa. Mainitut vålineet 35 avaavat suljinelimen 10 virtausyhteyden avaamiseksi puhdistusyhteeseen 8 silloin, kun vesipumpun 7 aikaan-saama alipaine lisååntyy poistotilassa 3.Cooling water enters inlet space 2 via inlet connection 4 20. The cooling water, in turn, leaves the filter device via the outlet connection 5. The filter 6 is arranged inside the filter housing between the inlet space 2 and the outlet space 3. Solids in the water, such as ice, sludge, municipal waste, algae, etc., remain in the filter. The filter device further comprises a cleaning connection 8, the mouth of which is in the vicinity of the filter 6. A continuous vacuum is arranged inside the cleaning connection 8 in some suitable manner, an example of which is shown in Fig. 3. The filter device further comprises an opening and closing closure member 10 with which the flow connection from the inlet space 2 to the cleaning connection 8 can be opened and closed. The filter device further comprises means for closing and, if necessary, opening the closing member 8 whenever the filter is clogged. Said means 35 open the closing member 10 to open the flow connection to the cleaning connection 8 when the negative pressure provided by the water pump 7 increases in the discharge space 3.

li 90829 5li 90829 5

Suodatin 6 on tasså esimerkissa tasomainen sihtilevy 9, joka on reunastaan nivelletty kåantyvaksi suodatinkotelon 1 suhteen. Sihtilevy 9 on esim lukui-silla pienilla aukoilla varustettu levy. Tulotila 2 on 5 sihtilevyn 9 ylåpuolinen tila ja poistotila 3 on sihti-levyn 9 alapuolinen tila. Suodatinlaitteeseen kuuluu edelleen jousilaite 11 sihtilevyn 9 pitamiseksi ennalta maaratyssa asennossa, olennaisesti vaaka-asennossa. Sihtilevy 9 on olennaisesti vaaka-asennossa, kun se on 10 vetta låpåisevåsså tilassa, ts ei-tukkeutuneena. Vesi-pumpun 7 imupuoli on yhdistetty poistoyhteeseen 5 jaah-dytysveden imemiseksi sihtilevyn 9 låpi. Sen vuoksi sihtilevyn 9 osittain tai kokonaan tukkeutuessa jåån, sohjon tms aineksen vaikutuksesta poistotilaan 3 synty-15 va alipaine kaantaa sihtilevya 9 nivelenså ympåri jou-sen 11 jousivoimaa vastaan alaspain. Sulkuelin 10 on sihtilevyn vapaassa reunassa, ts nivelkohdan suhteen vastakkaisessa reunassa oleva sulkulevy, joka on jar-jestetty sulkemaan osittaisesti virtausyhteys tuloti-20 lasta 2 puhdistusyhteeseen 8 silloin, kun sihtilevy 9 on lapåisevåssa tilassa jousilaitteen 11 pitaesså sihtilevya 9 olennaisesti vaaka-asennossa. Tulotilasta 2 puhdistusyhteeseen 8 tapahtuu jatkuvasti pientå vir-tausta, mikå osaltaan auttaa pitamåan sihtilevya 9 25 puhtaana. Tamån pienen virtauksen sååtåmistå vårten suodatinlaitteeseen kuuluu saatoelin 19, esim saatoruu-vi tai sen tapainen, joka on jårjestetty pitamåan pieni rako sulkuelimen 10 ja puhdistusyhteen 8 suuaukon vå-lillå niin ettei sulkuelin 10 sulje tåysin suuaukkoa 30 jousilaitteen 11 vaikutuksesta.In this example, the filter 6 is a planar screen plate 9, which is articulated at its edge so as to pivot relative to the filter housing 1. The screen plate 9 is e.g. a plate with numerous small openings. The inlet space 2 is the space above the screen plate 9 and the outlet space 3 is the space below the sieve plate 9. The filter device further comprises a spring device 11 for holding the screen plate 9 in a predetermined position, in a substantially horizontal position. The screen 9 is in a substantially horizontal position when it is 10 in a water permeable state, i.e. not clogged. The suction side of the water pump 7 is connected to an outlet connection 5 for sucking cooling water through a screen plate 9. Therefore, when the screen plate 9 is partially or completely blocked by the action of ice, sludge or the like, the vacuum generated in the discharge space 3 turns the screen plate 9 articulated around the spring force of the spring 11 downwards. The closure member 10 is a closure plate at the free edge of the screen plate, i.e. at the edge opposite the hinge point, which is arranged to partially close the flow connection from the inlet-20 child 2 to the cleaning connection 8 when the screen plate 9 is in a flattened state. A small current flows continuously from the inlet space 2 to the cleaning connection 8, which helps to keep the screen plate 9 25 clean. To control this small flow, the filter device comprises a conveying member 19, e.g. a convex screw or the like, arranged to keep a small gap between the closing member 10 and the opening of the cleaning connection 8 so that the closing member 10 does not completely close the opening 30 of the spring device 11.

Vålineisiin sulkuelimen 10 sulkemiseksi sekå avaamiseksi tarvittaessa suodattimen tukkeutumistilan-teessa kuuluu tasså esimerkissa siis sihtilevyn 9 nivel ja jousilaite 11 sekå alipaine, joka syntyy poistoti-35 laan 3 sihtilevyn 9 tukkeutuessa vesipumpun 7 edelleen toimiessa. Em vålineet avaavat suljinelimen 9 kååntå-mållå kuvan 2 mukaisesti sihtilevya alaspain ja avaavat 6 siten virtausyhteyden puhdistusyhteeseen silloin, kun vesipumpun 7 aikaansaama alipaine lisåantyy poistoti-lassa 3, jolloin sihtilevyn 9 paaile kertynyt aines, kuten jaa, vesisohjo, yhdyskuntajåtteet, leva yms pois-5 tuvat puhdistusyhteeseen 8 jårjestetyn alipaineen avul-la suodatinlaitteesta. Tåmå puhdistustoiminto toistuu automaattisesti aina silloin, kun paine poistotilassa 3 laskee ennaltamaaråtyn rajan alapuolelle.In this example, the means for closing and, if necessary, opening the closing member 10 in the event of a filter clogging thus comprise the joint of the screen plate 9 and the spring device 11, By means of the closing member 9, the means open the screen plate downwards as shown in Fig. 2 and thus open the flow connection to the cleaning connection when the vacuum provided by the water pump 7 increases in the discharge space 3, whereby the accumulated material, such as water, is discharged. 5 are brought into the cleaning connection 8 by means of a vacuum arranged from the filter device. This cleaning function is repeated automatically whenever the pressure in discharge mode 3 falls below a predetermined limit.

Puhdistusyhteen 8 alipaine aikaansaadaan edul-10 lisesti ja yksinkertaisella tavalla kuvan 3 mukaisella imulaitteella 16, ns pakokaasuinjektorilla, joka tuot-taa alipaineen pakokaasujen virtauksen aikaansaaman imuvaikutuksen avulla. Imulaitteeseen kuuluu pakokaasu-yhteeseen jarjestetty imuputki 17, jonka suuaukko on 15 virtauksen suuntaan, jolloin pakokaasujen virratessa putken suuaukon ohitse ne imevåt ilmaa pois imuputkesta 17. Imuputki 17 on yhdistetty puhdistusyhteeseen 8, joten sihtilevyn 9 paålta poistetut ainekset joutuvat imuputken kautta pakoputkeen ja sitå kautta ulos.The vacuum in the cleaning connection 8 is advantageously and simply provided by a suction device 16 according to Fig. 3, a so-called exhaust injector, which produces a vacuum by means of the suction effect produced by the flow of exhaust gases. The suction device comprises a suction pipe 17 arranged in the exhaust gas connection, the orifice of which is in the flow direction 15, whereby the exhaust gases flow past the pipe opening they suck air out of the suction pipe 17. The suction pipe 17 is connected to the cleaning connection 8, so that the material removed .

20 Kuvassa 4 on sovellutus, joka poikkeaa kuvan 1 sovellutuksesta siina, ettå sihtilevy 12 on kiinnitetty suodatinkotelon 1 sisaån siten, ettå se on kiinteåsti paikoillaan kannattimien varassa, mutta on kuitenkin tarvittaessa irrotettavissa. Tåsså sovellutuksessa 25 vålineisiin, joilla virtausyhteys tulotilasta 2 puhdistusyhteeseen 8 on avattavissa ja suljettavissa, kuuluu paineilmaisin 13, esim paine-eroanturi, såhkoisesti ohjattu sulkuventtiili 14 puhdistusyhteesså 8 ja oh-jauslaite 15 avaamaan ja sulkemaan sulkuventtiilia 14 30 paineilmaisimen 13 antamien kåskyjen perusteella. Sihtilevy 12 on tuloyhteen 4 ja puhdistusyhteen 8 ala-reunojen tasolla kaltevassa asennossa muodostaen kalte-van tason, joka viettåå puhditusyhteeseen 8 påin. Nor-maalisti sulkuventtiili on suljettuna, jolloin veden 35 virtaus tapahtuu normaalisti tuloyhteestå 4 sihtilevyn 12 låpi poistoyhteeseen 5. Sihtilevyn 12 tukkeutuessa poistotilaan 3 syntyy alipaine, paine-eroanturi 13 li 90829 7 havaitsee tåmån ja antaa avautumiskåskyn sulkuventtii-lille 14, jolloin sihtilevyn 12 huuhtelupuhdistus kåyn-nistyy ja virtaus tapahtuu tuloyhteestå 4 tulotilan 2 låpi sihtilevyå huuhdellen puhditusyhteeseen 8 ja sii-5 hen jårjestetyn (esim kuvan 3 jårjestelyllå aikaansaa-dun) alipaineen avulla pois. Sihtilevyn 12 puhdistuttua vesipumppu 7 saa jålleen vettå tuloyhteestå, jolloin alipaine lakkaa poistotilassa 3. Anturi 13 havaitsee tåmån ja antaa kåskyn ohjauslaitteelle 15 sulkea sulku-10 venttiilin 14, jolloin alkaa normaalikierto.Fig. 4 shows an embodiment which differs from the embodiment of Fig. 1 in that the screen plate 12 is fixed inside the filter housing 1 in such a way that it is fixedly in place on the supports, but can still be removed if necessary. In this application 25, the means for opening and closing the flow connection from the inlet space 2 to the cleaning connection 8 include a pressure detector 13, e.g. a differential pressure sensor, an electrically controlled shut-off valve 14 in the cleaning connection 8 and a control device 15 for opening and closing the shut-off valve 14 30. The screen plate 12 is in an inclined position at the level of the lower edges of the inlet connection 4 and the cleaning connection 8, forming an inclined plane which leads to the cleaning connection 8. Normally, the shut-off valve is closed, whereby the flow of water 35 normally takes place from the inlet connection 4 through the screen plate 12 to the outlet connection 5. When the screen plate 12 becomes blocked in the outlet space 3, a vacuum starts and the flow takes place from the inlet connection 4 through the inlet space 2 by rinsing off the screening means 8 and the sieve-5 by means of a vacuum (e.g. provided by the arrangement of Fig. 3). After the screen 12 has been cleaned, the water pump 7 again receives water from the inlet connection, whereby the vacuum ceases in the discharge space 3. The sensor 13 detects this and instructs the control device 15 to close the shut-off valve 14, whereby normal circulation begins.

Keksintoå ei rajata pelkåståån edellå esitet-tyjå sovellutusesimerkkejå koskevaksi, vaan monet muun-nokset ovat mahdollisia pysyttåesså patenttivaatimusten måårittelemån keksinnollisen ajatuksen puitteissa.The invention is not limited solely to the application examples presented above, but many modifications are possible while remaining within the scope of the inventive idea defined by the claims.

Claims

A filter device in a watercraft for filtering the engine cooling water in an open cooling water circulation, to which the filter device has a filter capsule (1), inside which is an inlet space (2) and an outlet space (3); an inlet connection (4) for conducting the cooling water to the inlet space; an outlet connection (5) for conducting the cooling water out of the outlet space; a filter (6) disposed within the filter capsule between the inlet compartment and the outlet compartment for filtering the cooling water; and a purge connection (8), the orifice of which is in the proximity of the filter (6), to which cooling water circulation causes a water pump (7) to effect the flow of cooling water through the filter device, a negative pressure is provided in the purge connection (8), and that the filter device thereto means with which the flow connection flow from the inlet space (2) to the purge connection can be substantially closed while the water is prevented from flowing through the filter by means of which the flow connection can be increased. at the occlusion of the filter when the negative pressure in the outlet space (3) increases under the action of the water pump (7), the filter occluding the material from the filter to the purification connection (8) with the aid of the present negative pressure.

2. A filter device according to claim 1, characterized in that a screening plate (9), which in its edge is pivotally guided in relation to the filter capsule (1) and in which the free edge of the screening plate, has a closure means, is provided for the filter (6). (10) before closing the purge connection; that the filter device has a spring device (11) for holding the screen plate in a predetermined position when the screen plate is in a permeable state; and l! 90829 11 that the means for closing and opening the flow connection to the purge connection consist of said guided screen, spring device and closure means.

3. A filter device according to claim 1 or 2, characterized in that the screen plate (9) in a normal filter position is in a substantially horizontal plane and in the purge lid the screen plate is pivoted about its point of contact at an angle from the horizontal layer 10 downwards.

4. A filter device according to claim 2 or 3, characterized in that the lower edge of the orifice of the cleaning connection (8) lies in substantially the same plane as the lower edge of the inlet connection (4); and that the closure means (10) is rigidly joined to the free edge of the screen plate extending from the face of the screen plate downwards.

5. A filter device according to claim 1, characterized in that a screen plate (12) is detachable for the filter (6), which is detachably obtained inside the filter capsule (1); that, to the means by which the flow connection from the inlet space (2) to the purge connection (8) can be opened and closed, a pressure detector (13) arranged to detect the change of the outlet space (3) is pressed when the sight plate is closed, a closing valve (14), which is arranged to close and open the flow connection from the inlet space to the purge connection, and a control device (15), which is arranged to open and close the closing valve on the basis of information given by the pressure detector.

Filter device according to any one of claims 1 to 5, characterized in that a filter device (16) is provided for the filter device for generating a negative pressure in the cleaning connection (8).

7. A filter device according to claim 6, characterized in that, to the suction device 12 (16), a sucker (17), spring's first breath is connected to the purge connection (8) and second breath inside the exhaust duct so that the suction pipe's spirit is directed into the exhaust gas. flow direction. II