NO314341B1 - Process and apparatus for fine filtration - Google Patents

Process and apparatus for fine filtration Download PDF

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Publication number
NO314341B1
NO314341B1 NO20012862A NO20012862A NO314341B1 NO 314341 B1 NO314341 B1 NO 314341B1 NO 20012862 A NO20012862 A NO 20012862A NO 20012862 A NO20012862 A NO 20012862A NO 314341 B1 NO314341 B1 NO 314341B1
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Norway
Prior art keywords
pump
pressure
fine filter
filter
pressure fluid
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Application number
NO20012862A
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Norwegian (no)
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NO20012862L (en
NO20012862D0 (en
Inventor
Joergen Groenfur
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Joergen Groenfur
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Joergen Groenfur filed Critical Joergen Groenfur
Priority to NO20012862A priority Critical patent/NO314341B1/en
Publication of NO20012862D0 publication Critical patent/NO20012862D0/en
Priority to EP02778857A priority patent/EP1392982A1/en
Priority to US10/480,017 priority patent/US20040141854A1/en
Priority to PCT/NO2002/000190 priority patent/WO2002101246A1/en
Publication of NO20012862L publication Critical patent/NO20012862L/en
Publication of NO314341B1 publication Critical patent/NO314341B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/61—Secondary circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/615—Filtering means

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Filtration Of Liquid (AREA)
  • Cyclones (AREA)

Description

FREMGANGSMÅTE OG ANORDNING FOR FINFILTRERING METHOD AND DEVICE FOR FINE FILTRATION

Denne oppfinnelse vedrører en fremgangsmåte for sikre en This invention relates to a method for securing a

stabil finfiltrering av væsker for eksempel i oljehydrauliske anlegg. Oppfinnelsen omfatter også en anordning for utøvelse av fremgangsmåten. stable fine filtration of liquids, for example in oil-hydraulic systems. The invention also includes a device for carrying out the method.

Det er velkjent at forurensninger i oljehydrauliske anleggs trykkfluid, for eksempel i form av metall- og mineralpar- It is well known that contaminants in oil-hydraulic plants' pressure fluid, for example in the form of metal and mineral par-

tikler, i vesentlig grad kan redusere anleggkomponentenes levetid. Slike anlegg omfatter derfor vanligvis minst ett filter som er innrettet for å filtrere ut forurensninger. En enkel og rimelig løsning er å forsyne pumpens sugeside med en relativt grovmasket sugesil og returrøret til anleggets reservoar med et returfilter. Imidlertid vil ikke forurens- ticks, can significantly reduce the service life of the plant components. Such facilities therefore usually include at least one filter which is designed to filter out contaminants. A simple and affordable solution is to supply the pump's suction side with a relatively coarse-mesh suction strainer and the return pipe to the plant's reservoir with a return filter. However, pollutant will not

ninger som produseres i hydraulikkpumpene ved en slik filter-plassering fanges opp før de strømmer inn i ventiler og aktuatorer. Særlig når det anvendes mer komplisert utstyr, nings produced in the hydraulic pumps by such a filter placement are captured before they flow into valves and actuators. Especially when more complicated equipment is used,

for eksempel servoventiler, er det vanlig å anbringe et høy-trykk fullstrømsfilter mellom anleggets pumpe(r) og ventiler. for example servo valves, it is common to place a high-pressure full-flow filter between the plant's pump(s) and valves.

Et vanlig fullstrømsfilter er ikke i stand til å filtrere ut A normal full flow filter is not able to filter out

de minste av de forurensningene det her er tale om. For å overkomme dette forhold har det derfor vært nødvendig å fore- the smallest of the pollutants in question here. In order to overcome this situation, it has therefore been necessary to

ta relativt hyppige oljeskift, eller å gjennomføre finfiltrering, også benevnt dypfiltrering, av trykkfluidet. take relatively frequent oil changes, or carry out fine filtration, also known as deep filtration, of the pressure fluid.

Finfiltere av den art det her er tale om er, om de anvendes på en riktig måte, i stand til å filtrere ut så fine forurensninger at trykkfluidet etter behandling er å anse som fullverdig med hensyn til forurensninger. Finfiltere kan være forsynt med en vannutskilleranordning. Fine filters of the type in question here are, if they are used in the right way, able to filter out such fine contaminants that the pressure fluid after treatment can be considered to be fully functional with respect to contaminants. Fine filters can be equipped with a water separator device.

For at finfiltrering gjennom filter av den angjeldende art So that fine filtering through filters of the relevant species

skal gi et tilfredsstillende resultat må finfilteret forsynes med fluid i et relativt snevert trykkområde, slik at trykk- to give a satisfactory result, the fine filter must be supplied with fluid in a relatively narrow pressure range, so that pressure

fallet over filteret holdes konstant. Finfilter fungerer best når det ikke er overtrykk på filterets utløpsside. Det filt- the drop across the filter is kept constant. Fine filters work best when there is no excess pressure on the outlet side of the filter. It felt-

rerte trykkfluid strømmer således bort fra filteret ved hjelp av tyngdekraften. Strømningsmengden gjennom filteret må være konstant og helst innta en laminær strømningsform. The pressurized fluid thus flows away from the filter by means of gravity. The flow rate through the filter must be constant and preferably take a laminar flow form.

Ifølge kjent teknikk er det to hovedfremgangsmåter som anven- According to prior art, there are two main methods that use

des ved bruk av finfilter. Ved en første fremgangsmåte pumpes trykkfluid via en separat pumpe fra anleggets hovedreservoar til et finfilter. Overskytende- og filtrert fluid returneres trykkløst til reservoaret. Ved en andre fremgangsmåte drene- especially when using a fine filter. In a first method, pressurized fluid is pumped via a separate pump from the plant's main reservoir to a fine filter. Excess and filtered fluid is returned to the reservoir without pressure. In a second method, drain

res en viss trykkfluidmengde, for eksempel ved hjelp av en konstantstrømningsventil, ut av anleggets trykkrets til finfilteret . a certain amount of pressurized fluid, for example with the help of a constant flow valve, is removed from the system's pressure circuit to the fine filter.

Trykkfluidet kan strømme trykkløst tilbake til reservoaret, The pressure fluid can flow pressure-free back to the reservoir,

men det er mer vanlig å anvende et separat reservoar for fin-filtrert trykkfluid, hvorfra fluidet senere returneres ved but it is more common to use a separate reservoir for finely filtered pressure fluid, from which the fluid is later returned by

hjelp av en egen pumpe til hovedreservoaret. Pumpene som anvendes sammen med et eget reservoar kan være nivåstyrte for at renseanlegget skal kunne styres automatisk. using a separate pump to the main reservoir. The pumps used together with a separate reservoir can be level-controlled so that the treatment plant can be controlled automatically.

Det er også kjent å anvende en reversibel pumpe som i én dreieretning forsyner finfilteret med trykkfluid, og ved mot-satt dreieretning transporterer trykkfluidet mellom reservoa-rene. Ved denne sistnevnte metode blir filtreringstiden nød-vendigvis forlenget. It is also known to use a reversible pump which in one direction of rotation supplies the fine filter with pressure fluid, and in the opposite direction of rotation transports the pressure fluid between the reservoirs. With this latter method, the filtration time is necessarily extended.

Finfilterets mulige plassering i forhold til hydraulikkanlegget øvrige komponenter begrenses i betydelig grad av at finfilterets returside er trykkløs. Anlegg ifølge kjent teknikk egner seg ikke for anvendelse i mobile anlegg så som gravemaskiner og hjulgående maskiner. The fine filter's possible location in relation to the other components of the hydraulic system is limited to a significant extent by the fact that the return side of the fine filter is depressurised. Installations according to known technology are not suitable for use in mobile installations such as excavators and wheeled machines.

I finfilteranlegg hvor det filtrerte trykkfluid trykkløst returneres til et separat reservoar, har det vist seg at av-leiring av forurensninger og vannoppsamling kan forekomme etter en tids anvendelse. Nødvendig rengjøring medfører at anlegget periodevis må tas ut av drift. In fine filter systems where the filtered pressure fluid is returned without pressure to a separate reservoir, it has been shown that deposition of pollutants and water collection can occur after a period of use. Necessary cleaning means that the facility must be taken out of operation periodically.

Oppfinnelsen har til formål å avhjelpe ulempene ved kjent teknikk. The purpose of the invention is to remedy the disadvantages of known technology.

Formålet oppnås i henhold til oppfinnelsen ved de trekk som er angitt i nedenstående beskrivelse og i de etterfølgende patentkrav. The purpose is achieved according to the invention by the features indicated in the description below and in the subsequent patent claims.

En dobbelpumpe, tandempumpe, pumpe med en matedel og en hoveddel, alternativt en annen pumpe som er forsynt med to separate pumpedeler, drives fra én drivmotor. Den første pumpes, matepumpen, sugeside er koplet til anleggets hovedreservoar og pumper under drift trykkfluid fra reservoaret til et finfilter. En eventuell overskytende volummengde fra den første pumpens trykkside strømmer gjennom en trykkbe-grensningsventil til den andre pumpes sugeside, hvor også det finfiltrerte trykkfluid fra finfilterets utløp strømmer inn. A double pump, tandem pump, pump with a feed part and a main part, alternatively another pump which is equipped with two separate pump parts, is driven from one drive motor. The suction side of the first pump, the feed pump, is connected to the plant's main reservoir and, during operation, pumps pressurized fluid from the reservoir to a fine filter. Any excess volume from the first pump's pressure side flows through a pressure limiting valve to the second pump's suction side, where the finely filtered pressure fluid from the fine filter's outlet also flows in.

Med overskytende volummengde menes her differansen mellom det volum den første pumpe leverer og det volum som kan passere gjennom finfilteret uten at tykkfallet over filteret blir større enn det som er foreskrevet By excess volume is meant here the difference between the volume delivered by the first pump and the volume that can pass through the fine filter without the thickness drop over the filter being greater than what is prescribed

Trykkreduksjonsventilen besørger således at det opprettholdes et konstant trykkfall over filteret. Etter hvert som finfilteret tettes til, vil trykkfluidstrømmen gjennom trykkreduksjonsventilen øke. The pressure reduction valve thus ensures that a constant pressure drop across the filter is maintained. As the fine filter becomes clogged, the pressure fluid flow through the pressure reduction valve will increase.

I én utførelsesform strømmer trykkvæske tilbake til hovedreservoaret fra den andre pumpes trykkside under stor hastighet, slik at eventuelle avleiringer og oppsamling av vann i reservoaret ikke kan forekomme. I en alternativ utførelses-form ledes trykkvæske fra den andre pumpes trykkside til et nedstrøms hydraulikkanlegg som kan omfatte andre pumper, filter e, ventiler og aktuatorer. In one embodiment, pressure fluid flows back to the main reservoir from the second pump's pressure side at high speed, so that possible deposits and accumulation of water in the reservoir cannot occur. In an alternative embodiment, pressure fluid is led from the second pump's pressure side to a downstream hydraulic system which may include other pumps, filters e, valves and actuators.

Det kan være fordelaktig å alltid tilføre en begrenset mengde trykkfluid fra den første pumpes trykkside til den andre pumpes sugeside for å forhindre tørrkjøring og kavitasjon i den andre pumpe. It can be advantageous to always supply a limited amount of pressure fluid from the first pump's pressure side to the second pump's suction side to prevent dry running and cavitation in the second pump.

I det etterfølgende beskrives et ikke-begrensende eksempel på en foretrukket fremgangsmåte og anordning for utøvelse av fremgangsmåten som er anskueliggjort på medfølgende tegning-er , hvor: Fig. 1 viser et koplingsskjerna for et finfilter renseanlegg hvor renset trykkfluid føres tilbake til reservoaret; og Fig. 2 viser et koplingsskjerna av anlegget i fig. 1, men her er den andre pumpens utløp/trykkside koplet til et nedstrøms hydraulikkanlegg. In what follows, a non-limiting example of a preferred method and device for carrying out the method is described in the accompanying drawings, where: Fig. 1 shows a connection core for a fine filter purification plant where purified pressurized fluid is returned to the reservoir; and Fig. 2 shows a connection core of the plant in Fig. 1, but here the other pump's outlet/pressure side is connected to a downstream hydraulic system.

Få tegningene betegner henvisningstallet 1 et finfilter renseanlegg for trykkfluid. In the few drawings, the reference number 1 denotes a fine filter cleaning system for pressure fluid.

Trykkfluid strømmer fra et hovedreservoar 2 via en rør 4 til en første pumpes 6 innløp/sugeside. Pumpen 6 er sammen med en andre pumpe 8 drevet av en motor 10. Trykkfluid strømmer fra den første pumpes 6 trykkside via rørforbindelser 12, 14 og 16 til en trykkreduksjonsventil 18 og til et finfilters 20 innløpsside via en tilbakeslagsventil 22. Fra finfilterets 20 utløp og fra trykkreduksjonsventilens 18 utløp strømmer trykkfluid gjennom rør 24 og 26 til den andre pumpes 8 sugeside. Pressurized fluid flows from a main reservoir 2 via a pipe 4 to the inlet/suction side of a first pump 6. The pump 6 is together with a second pump 8 driven by a motor 10. Pressure fluid flows from the pressure side of the first pump 6 via pipe connections 12, 14 and 16 to a pressure reduction valve 18 and to the inlet side of a fine filter 20 via a non-return valve 22. From the outlet of the fine filter 20 and from the outlet of the pressure reduction valve 18, pressure fluid flows through pipes 24 and 26 to the suction side of the second pump 8.

En begrenset mengde trykkfluid strømmer av smøre- og kjøle-tekniske årsaker gjennom forbindelsen 28 fra den første pumpes 6 trykkside til den andre pumpes 6 sugeside. A limited amount of pressure fluid flows for lubrication and cooling technical reasons through the connection 28 from the pressure side of the first pump 6 to the suction side of the second pump 6.

Fra den andre pumpes 8 trykkside strømmer trykkfluid tilbake til reservoaret 2 via et rør 30, eventuelt gjennom en tilbakeslagsventil 32. From the pressure side of the second pump 8, pressurized fluid flows back to the reservoir 2 via a pipe 30, possibly through a non-return valve 32.

Finfilteret 20 kan være forsynt med en trykkdifferansemåler 34 og en volumstrømsmåler 34a. Alle anleggets komponenter er av i og for seg kjent art. The fine filter 20 can be provided with a pressure difference meter 34 and a volume flow meter 34a. All the plant's components are of a known nature in and of themselves.

Når pumpen 6 forsyner finfilteret 20 med trykkfluid gjennom rørene 4, 12 og 16 i en større mengde en finfilteret 20 er dimensjonert for å filtrere, vil trykkreduksjonsventilen 18 ved å åpne for en fluidstrøm gjennom rørene 14 og 26 bevirke at et nøyaktig innløpstrykk til finfilteret 20 opprettholdes på et ønsket nivå. Dette medfører at finfilteret 20 kan ut-nyttes best mulig både med hensyn til renseevne og levetid. When the pump 6 supplies the fine filter 20 with pressurized fluid through the pipes 4, 12 and 16 in a larger amount than the fine filter 20 is designed to filter, the pressure reduction valve 18 by opening for a fluid flow through the pipes 14 and 26 will cause an accurate inlet pressure to the fine filter 20 maintained at a desired level. This means that the fine filter 20 can be utilized as best as possible both with regard to cleaning ability and service life.

Trykkfluid strømmer til den andre pumpes 8 sugeside fra finfilteret 20 gjennom røret 24 på en slik måte at finfilterets utløpsside ikke utsettes for overtrykk, og fra overtrykksventilen 18 gjennom røret 26. I den andre pumpe 8 økes trykket for å kunne anvende fluidet i en etterfølgende operasjon, hvorved trykkfluidets hastighet ved tilbakestrømning til reservoaret 2 via røret 30 for eksempel ved hjelp av en ikke vist rørinnsnevring kan økes. Pressure fluid flows to the suction side of the second pump 8 from the fine filter 20 through the pipe 24 in such a way that the outlet side of the fine filter is not exposed to overpressure, and from the overpressure valve 18 through the pipe 26. In the second pump 8, the pressure is increased in order to be able to use the fluid in a subsequent operation , whereby the speed of the pressure fluid when it flows back to the reservoir 2 via the pipe 30 can be increased, for example by means of a pipe narrowing not shown.

I en alternativ utførelsesform, se fig. 2, er røret 30 forbundet til et nedstrøms hydraulikkanlegg 40 som kan omfatte en eller flere av komponentene: en pumpe 42 med motor 44, et hovedfilter 46, en tilbakeslagsventil 48, en overtrykksventil 50 og ventiler og aktuatorer 52. Alle av i og for seg kjent art. In an alternative embodiment, see fig. 2, the pipe 30 is connected to a downstream hydraulic system 40 which may include one or more of the components: a pump 42 with motor 44, a main filter 46, a non-return valve 48, a pressure relief valve 50 and valves and actuators 52. All individually known species.

Finfilter renseanlegget 1 kan således besørge hele tilførse-len av trykkfluid til hydraulikkanlegget 40. Alternativt kan pumpen 42 ved hjelp av motoren 44 også pumpe trykkvæske til hydraulikkanlegget .40. Hovedfilteret 46 er et fullstrøms trykkfilter som er beskyttet av den forbipasseringskoplede tilbakeslagsventil 48. Overtrykksventilen 50 forhindrer over- The fine filter cleaning system 1 can thus provide the entire supply of pressure fluid to the hydraulic system 40. Alternatively, the pump 42 can, with the help of the motor 44, also pump pressure fluid to the hydraulic system 40. The main filter 46 is a full-flow pressure filter which is protected by the bypass coupled check valve 48. The pressure relief valve 50 prevents over-

belastning av ventiler og aktuatorer 52. load on valves and actuators 52.

Ved anvendelse av fremgangsmåten ifølge oppfinnelsen er det både ved trykksatte og ikke trykksatte anlegg tilstrekkelig med en drivenhet for anleggets pumper. Ved at trykkfluidet returneres til reservoaret 2 med betydelig hastighet oppnås god sirkulasjon i reservoaret, hvorved bunnfelling forhind-res. When using the method according to the invention, it is sufficient for both pressurized and non-pressurized plants to have a drive unit for the plant's pumps. As the pressure fluid is returned to the reservoir 2 at a considerable speed, good circulation is achieved in the reservoir, whereby sedimentation is prevented.

Det er videre fordelaktig at finfiltering i følge den fore-slåtte fremgangsmåte er lite følsom for brå bevegelser og derved er velegnet for mobile maskiner. It is also advantageous that fine filtering according to the proposed method is not sensitive to sudden movements and is therefore suitable for mobile machines.

En ytterligere fordel er at det er stor frihet ved plassering av finfilteret i forhold til hydraulikkanleggets øvrige komponenter og at et eget filterreservoar ikke er nødvendig. A further advantage is that there is great freedom when placing the fine filter in relation to the hydraulic system's other components and that a separate filter reservoir is not necessary.

Claims (6)

1. Fremgangsmåte ved anvendelse av et oljehydraulisk finfilter (20) av den art hvor en første pumpe/rnatepumpe (6) forsyner finfilteret (20) med trykkfluid og hvor finfilterets (20) utløpsside er innrettet til å arbeide uten overtrykk, karakterisert ved at trykkfluid som trykkløst strømmer ut fra finfilteret (20) viderepumpes av en andre pumpe (8), og hvor den andre pumpe (8) drives fra samme drivanordning (1) som finfilterets (20) første pumpe/matepumpe (6).1. Procedure for using an oil-hydraulic fine filter (20) of the type where a first pump/replacement pump (6) supplies the fine filter (20) with pressure fluid and where the outlet side of the fine filter (20) is designed to work without excess pressure, characterized in that pressure fluid which flows out without pressure from the fine filter (20) is further pumped by a second pump (8), and where the second pump (8) is driven from the same drive device (1) as the fine filter's (20) first pump/feed pump (6). 2. Fremgangsmåte i henhold til krav 1, karakterisert ved at trykkfluid fra den andre pumpe (8) strømmer til reservoaret (2)..2. Method according to claim 1, characterized in that pressure fluid from the second pump (8) flows to the reservoir (2). 3. Fremgangsmåte i henhold til krav 1, karakterisert ved at trykkfluid fra den andre pumpe (8) strømmer til et hydraulikkanlegg (40).3. Method according to claim 1, characterized in that pressure fluid from the second pump (8) flows to a hydraulic system (40). 4. Fremgangsmåte i henhold til ett eller flere av de fore-gående krav, karakterisert ved at trykkfluid strømmer fra matepumpens (6) trykkside via en overtrykksventil (18) til den andre pumpes (8) sugeside.4. Method according to one or more of the preceding claims, characterized in that pressurized fluid flows from the pressure side of the feed pump (6) via an overpressure valve (18) to the suction side of the other pump (8). 5. Fremgangsmåte i henhold til ett eller flere av de fore-gående krav, karakterisert ved at en begrenset mengde trykkfluid strømmer fra matepumpens (6) trykkside til den andre pumpes (8) sugeside.5. Method according to one or more of the preceding claims, characterized in that a limited amount of pressure fluid flows from the pressure side of the feed pump (6) to the suction side of the other pump (8). 6. Anordning ved oljehydraulisk finfilter (20) av den art hvor en første pumpe/matepumpe (6) forsyner finfilteret (20) med trykkfluid og hvor finfilterets (20) utløpsside er innrettet til å arbeide uten overtrykk, karakterisert ved at finfilterets (20) utløpsside er forbundet til den andre pumpes (8) sugeside og hvor den andre pumpe (8) har felles drift fra samme drivanordning (1) som finfilterets (20) første pumpe/matepumpe (6).6. Device for an oil-hydraulic fine filter (20) of the type where a first pump/feed pump (6) supplies the fine filter (20) with pressure fluid and where the outlet side of the fine filter (20) is designed to work without excess pressure, characterized in that the fine filter (20) outlet side is connected to the second pump's (8) suction side and where the second pump (8) has joint operation from the same drive device (1) as the fine filter's (20) first pump/feed pump (6).
NO20012862A 2001-06-08 2001-06-08 Process and apparatus for fine filtration NO314341B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NO20012862A NO314341B1 (en) 2001-06-08 2001-06-08 Process and apparatus for fine filtration
EP02778857A EP1392982A1 (en) 2001-06-08 2002-05-30 A method and device for fine filtering
US10/480,017 US20040141854A1 (en) 2001-06-08 2002-05-30 Method and device for fine filtering
PCT/NO2002/000190 WO2002101246A1 (en) 2001-06-08 2002-05-30 A method and device for fine filtering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO20012862A NO314341B1 (en) 2001-06-08 2001-06-08 Process and apparatus for fine filtration

Publications (3)

Publication Number Publication Date
NO20012862D0 NO20012862D0 (en) 2001-06-08
NO20012862L NO20012862L (en) 2002-12-09
NO314341B1 true NO314341B1 (en) 2003-03-10

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NO20012862A NO314341B1 (en) 2001-06-08 2001-06-08 Process and apparatus for fine filtration

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US (1) US20040141854A1 (en)
EP (1) EP1392982A1 (en)
NO (1) NO314341B1 (en)
WO (1) WO2002101246A1 (en)

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Publication number Priority date Publication date Assignee Title
CN101655116B (en) * 2009-09-17 2011-12-14 成都成设航空科技有限公司 Hydraulic power source system
CN102650306A (en) * 2011-02-25 2012-08-29 上海液力液压机电制造有限公司 Vacuum oil pumping circulation filter system
CN108397432B (en) * 2018-02-27 2019-11-19 首钢京唐钢铁联合有限责任公司 A kind of blast furnace air machine hydraulic system

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
DE2024675A1 (en) * 1970-05-21 1971-12-09 Robert Bosch Gmbh, 7000 Stuttgart Device for filtering an open pressure medium circuit
US5251442A (en) * 1991-10-24 1993-10-12 Roche Engineering Corporation Fluid power regenerator
US5395519A (en) * 1993-08-03 1995-03-07 Caterpillar Inc. Filter device for a hydraulic system
US5549832A (en) * 1994-12-22 1996-08-27 Century Manufacturing Company Vehicle coolant recycling

Also Published As

Publication number Publication date
NO20012862L (en) 2002-12-09
EP1392982A1 (en) 2004-03-03
US20040141854A1 (en) 2004-07-22
WO2002101246A1 (en) 2002-12-19
NO20012862D0 (en) 2001-06-08

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