DK172223B1 - Device for filtering liquids - Google Patents
Device for filtering liquids Download PDFInfo
- Publication number
- DK172223B1 DK172223B1 DK043294A DK43294A DK172223B1 DK 172223 B1 DK172223 B1 DK 172223B1 DK 043294 A DK043294 A DK 043294A DK 43294 A DK43294 A DK 43294A DK 172223 B1 DK172223 B1 DK 172223B1
- Authority
- DK
- Denmark
- Prior art keywords
- piston
- wall portion
- filter
- filter wall
- tube
- Prior art date
Links
- 239000007788 liquid Substances 0.000 title claims description 51
- 238000001914 filtration Methods 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims description 79
- 238000004140 cleaning Methods 0.000 claims description 37
- 235000013601 eggs Nutrition 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 8
- 102000002322 Egg Proteins Human genes 0.000 claims description 7
- 108010000912 Egg Proteins Proteins 0.000 claims description 7
- 230000004913 activation Effects 0.000 claims description 6
- 210000002969 egg yolk Anatomy 0.000 claims description 4
- 235000013345 egg yolk Nutrition 0.000 claims description 4
- QCVGEOXPDFCNHA-UHFFFAOYSA-N 5,5-dimethyl-2,4-dioxo-1,3-oxazolidine-3-carboxamide Chemical compound CC1(C)OC(=O)N(C(N)=O)C1=O QCVGEOXPDFCNHA-UHFFFAOYSA-N 0.000 claims description 3
- 210000000969 egg white Anatomy 0.000 claims description 3
- 235000014103 egg white Nutrition 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000005286 illumination Methods 0.000 claims 1
- 239000000047 product Substances 0.000 description 13
- 238000001994 activation Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 235000012970 cakes Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 210000003278 egg shell Anatomy 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000010746 mayonnaise Nutrition 0.000 description 1
- 239000008268 mayonnaise Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000015504 ready meals Nutrition 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
- B01D29/118—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration open-ended
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
- B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6484—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a translatory movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
- B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
- B01D29/82—Handling the filter cake in the filter for purposes other than for regenerating for drying by compression
- B01D29/824—Handling the filter cake in the filter for purposes other than for regenerating for drying by compression using pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/28—Position of the filtering element
- B01D2201/287—Filtering elements with a vertical or inclined rotation or symmetry axis
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Details Of Reciprocating Pumps (AREA)
- Coating Apparatus (AREA)
Description
DK 172223 B1DK 172223 B1
Opfindelsen angår en indretning til filtrering af væskeformige æggeprodukter, såsom æggehvide og/eller æggeblomme, i et anlæg til behandling af æggeprodukter, omfattende et rør med et vægparti udformet som filter, 5 en væsketilgang til røret, en materialeafgang for frafiltreret materiale, såsom skalrester og hvidestrenge, et uden for røret beliggende opsamlingsorgan for filtreret æggeprodukt, et skrabeorgan og et drivorgan, der kan bevæge skrabeorganet langs filtervægpartiet for 10 bortskrabning af frafiltrerede materiale.The invention relates to a device for filtering liquid egg products, such as egg white and / or egg yolk, in a plant for treating egg products, comprising a tube with a wall portion formed as a filter, a liquid access to the tube, a material discharge for filtered material such as shell residues and white strings, a filtered egg product collecting means located outside the tube, a scraper means and a drive means capable of moving the scraper along the filter wall portion for scraping off filtered material.
Fra kommercielle anlæg til behandling af æggeprodukter kendes en sådan indretning, hvor skrabeorganet er en arm, der ligger an mod en cylindrisk filtervæg langs en linie parallelt med cylinderaksen. Armen er 15 bevægelig i filtervaeggens omkredsretning og skraber frafiltreret materiale bort fra filtervæggen, så materialet falder ned i en bunke ved bunden af filteret .From commercial plants for processing egg products, such a device is known in which the scraper means is an arm which abuts against a cylindrical filter wall along a line parallel to the cylinder axis. The arm is movable in the circumferential direction of the filter wall and scrapes the filtered material away from the filter wall so that the material falls into a pile at the bottom of the filter.
Dette filter har en række ulemper, hvoraf de 20 største er, at anlægget periodevis skal standses for åbning af filteret og fjernelse af frafiltreret materiale, og at der ved denne fjernelse går betydelige mængder kostbart æggeprodukt tabt.This filter has a number of drawbacks, of which the 20 largest are that the system must periodically be stopped for opening the filter and removing filtered material and that during this removal considerable amounts of precious egg product are lost.
Filtrering af æggeprodukter indebærer specielle 25 problemstillinger, der normalt ikke forekommer ved filtrering af andre væsker. Af hensyn til procesøkonomien er det væsentligt at minimelre eller undgå spild af æggeprodukterne. Tab af få procent af de væskeformige produkter kan medføre, at processen er urentabel.Filtration of egg products involves special problems that do not normally occur when filtering other liquids. For the sake of the process economy, it is essential to minimize or avoid wastage of the egg products. Loss of a few percent of liquid products can make the process unprofitable.
30 Æggeprodukterne er vanskelige at filtrere, fordi filteret hurtigt tilstoppes af de relativt seje hvidestrenge. Der stilles endvidere strenge hygiejniske krav til driften af procesanlægget, hvilket medfører, at adskillelse af filteret for rensning er uønsket.30 The egg products are difficult to filter because the filter is quickly clogged by the relatively cool white strands. Furthermore, strict hygienic requirements are set for the operation of the processing plant, which means that separation of the filter for cleaning is undesirable.
35 Der kendes filtre til brug ved andre anvendelser, 2 DK 172223 B1 hvor der ikke stilles de samme strenge krav som ved filtrering af æg.35 Filters for use in other applications are known, 2 DK 172223 B1, where the same stringent requirements are not met as for egg filtration.
GB-A 1 301 137 beskriver således et selvrensende filter, hvor frafiltreret materiale skrabes af filteret 5 med et stempel, som drives af den væske, der filtreres. Materialet skubbes foran stemplet til enden af filteret, hvor en konisk indsnævring standser stemplet. En ventil kan åbnes for udskyldning af materialet, hvilket medfører et stort væsketab.GB-A-1 301 137 thus describes a self-cleaning filter in which filtered material is scraped off the filter 5 by a piston driven by the liquid being filtered. The material is pushed in front of the piston to the end of the filter where a conical constriction stops the piston. A valve can be opened to flush out the material, resulting in a large loss of fluid.
10 US-A 3 850 802 beskriver et filter til rensning af vand, hvor børster på en stang kan børste indersiden af filteret rent for frafiltreret materiale, der falder til bunds i filteret. Filteret renses ved fjernelse af en bundplade, hvilket kun kan ske, mens filteret er ude 15 af drift.US-A-3 850 802 discloses a filter for purifying water where brushes on a rod can brush the inside of the filter purely for filtered material which falls to the bottom of the filter. The filter is cleaned by removing a bottom plate, which can only happen while the filter is out of operation.
DE-A 1 611 109 beskriver et slamfilter med filterelementer, der renses ved tilbagestrømning af væske. Slammet føres til et supplerende kammer, hvis ene endevæg er et stempel, og hvis anden ende er en fjeder-20 belastet ventil, der åbner, når stemplet presses nedad.DE-A-1 611 109 discloses a sludge filter with filter elements which are purified by backflow of liquid. The slurry is passed to a supplementary chamber, one end wall of which is a piston and the other end of which is a spring-loaded valve which opens when the piston is pressed downwards.
Et lignende filter med differenstrykmåling kendes fra DE-A 4 307 723, hvor det frafiltrerede materiale udskylles gennem en sidevendt afgangsledning.A similar filter with differential pressure measurement is known from DE-A 4 307 723, where the filtered material is flushed through a lateral discharge line.
EP-A 0 494 800 beskriver et filter med et stempel, 25 der af en drivmotor kan skrues op og ned på en gevindstang for bortskrabning af frafiltreret materiale, der falder ned i bunden af filteret og kan udskylles gennem en sidevendt afgangsåbning.EP-A-0 494 800 discloses a filter with a piston 25 which can be screwed up and down by a drive motor on a threaded rod for scraping off filtered material which falls into the bottom of the filter and can be flushed through a lateral outlet opening.
Fra tysk fremlæggelsesskrift nr. 1 153 724 kendes 30 et lodretstående filter, hvor et rensestempel er fast forbundet med bunden i filterhuset, hvilket betyder, at filteret nødvendigvis må tages ud af drift, hver gang rensestemplet skal bevæges hen langs filteroverfladen, og at al væsken i filteret udtømmes ved hver rensebevæ-35 gelse. Dette giver et meget stort tab af væske, og især DK 172223 B1 3 i fødevareindustrien er et sådant væsketab ikke acceptabelt, navnlig ikke ved filtrering af væsker, hvor filteret helst skal renses ofte for opretholdelse af en passende høj filtreringskapacitet.From German Patent Specification No. 1,153,724, a vertical filter is known in which a cleaning piston is firmly connected to the bottom of the filter housing, which means that the filter must necessarily be taken out of operation every time the cleaning piston has to move along the filter surface and that all the liquid in the filter is discharged at each cleaning movement. This results in a very large loss of liquid, and especially in the food industry such a loss of liquid is not acceptable, especially not in the filtration of liquids, where the filter should preferably be cleaned frequently to maintain an appropriately high filtration capacity.
5 Fra europæisk patent 0 458 808 kendes en filter indretning, hvor renseelementet består af en stang med flere nedragende skrabestykker med en højde mindre end radius i røret. Filtervægspartiet ligger i rørets nedre halvdel, og røret har en åben ende, der virker som 10 materialeafgang. Renseelementets stang passerer ud gennem materialafgangen hen til en pneumatisk cylinder, der er monteret bevægelig i rørets tværretning, så renseelementet ved bevægelse i retning hen mod materialeafgangen ligger i den nedre rørhalvdel, hvor skrabe-15 stykkerne skubber frafiltreret materiale hen mod materialeafgangen, hvorimod renseelementet ved den modsatrettede bevægelse er løftet op i den øvre rør-halvdel, hvor skrabestykkerne ikke rører materialet.From European patent 0 458 808 a filter device is known in which the cleaning element consists of a rod with several projecting scrap pieces having a height less than radius in the pipe. The filter wall portion is in the lower half of the tube and the tube has an open end which acts as a discharge of material. The cleaning element bar passes out through the material outlet to a pneumatic cylinder mounted movably in the transverse direction of the pipe, so that the cleaning element, when moving towards the material outlet, lies in the lower half of the pipe, where the scrapers push filtered material towards the material outlet, whereas the cleaning element at the opposite movement is lifted into the upper half of the pipe where the scrap pieces do not touch the material.
Det frasorterede materiale skubbes således ud gennem 20 materialeafgangen sammen med den i materialet bundne væske og den yderligere væske, som ikke er løbet ud gennem hullerne i filtervægpartiet. Den filtrerede væske løber via et mellemstykke ned i et underliggende rør med opadvendende åbninger.Thus, the filtered material is ejected through the material outlet along with the liquid bound in the material and the additional liquid which has not flowed out through the holes in the filter wall portion. The filtered liquid flows via an intermediate piece into an underlying pipe with upwardly opening openings.
25 Andre filterindretninger med forskellige typer renseelementer kendes fra de europæiske ansøgninger 0 120 988, 0 311 716 og 0 337 966 samt de internationale skrifter WO 92/22372 og 93/11851. Det er et fællestræk ved de kendte filterindretninger, at de er af for-30 holdsvis kompliceret udformning, og at de enten medfører anseeligt væsketab sammen med det frafiltrerede materiale eller kræver periodevise stop af væskebehandlingen for manuel rensning af indretningen, hvilket udover tidsforbruget medfører spild af væske ved 35 tømning af indretningen.25 Other filter devices with different types of cleaning elements are known from European applications 0 120 988, 0 311 716 and 0 337 966 as well as the international documents WO 92/22372 and 93/11851. It is a common feature of the known filter devices that they are of a relatively complicated design and that they either result in considerable loss of fluid with the filtered material or require periodic stopping of the liquid treatment for manual cleaning of the device, which in addition to the time consumption leads to waste of liquid at 35 emptying the device.
DK 172223 B1 4DK 172223 B1 4
Opfindelsen har til formål at anvise en indretning til filtrering af æggeprodukter med kontinuert drift i lange tidsrum uden stop for manuel rensning samtidig med, at væsketabet holdes fordelagtigt lille.The invention has for its object to provide a device for filtration of continuous-life egg products without long periods of manual cleaning, while keeping the loss of liquid advantageously low.
5 Med henblik herpå er indretningen ifølge opfindel sen ejendommelig ved kombinationen af - at skrabeorganet er et i rørets længderetning forskydeligt stempel med mindst én stempelendeflade, der vender hen mod materialeafgangen og har i det væsent- 10 lige samme tværsnit som rørets indre lysning ved filtervægpartiet, - at materialeafgangen er beliggende i forlængelse af filtervægpartiet, og - at et afspærringsorgan ved materialeafgangen er et 15 mellem en åben og en lukket stilling indstilleligt afspærringsorgan, der i lukket stilling hindrer udpresning af frafiltreret materiale, når stemplet bevæges hen mod afspærringsorganet.For this purpose, the device according to the invention is characterized by the combination of - that the scraper means is a longitudinally displaceable piston with at least one piston end face facing the material outlet and having substantially the same cross-section as the inner liner of the tube at the filter wall portion, - that the material discharge is located in extension of the filter wall portion, and - that a blocking means at the material discharge is a locking means adjustable between an open and a closed position, which prevents the pressing of filtered material in the closed position as the piston moves towards the closing means.
Mens filtreringen foregår, kan stemplet med 20 passende intervaller afhængende af materialeindholdet i væsken og af filtermaskestørrelsen bevæges hen langs filtervægpartiet, hvor stempelendefladen som følge af, at den udfylder hele rørtværsnittet, vil bortskrabe det materiale, som er afsat på indersiden af filtervæg-25 partiet.While the filtration is taking place, the plunger can be moved at 20 suitable intervals depending on the material content of the liquid and the filter mesh size along the filter wall portion, where the plunger end surface, as it fills the entire pipe cross section, will dispose of the material deposited on the inside of the filter wall portion. .
Afspærringsorganet står normalt i den lukkede stilling, og stemplet vil først skubbe frafiltreret materiale hen til afspærringsorganet og fylde rørvolumenet mellem dette og stemplets hosliggende yderstil-30 ling op med materialet, hvorefter stemplet ved efterfølgende aktiveringer kan kompaktere materialet i den ønskede grad, så væskeindholdet i materialet nedbringes, hvorefter afspærringsorganet kan åbnes, så stemplet presser det drænede materiale ud gennem materiale-35 afgangen. Det kompakterede materiale og selve stemplet 5 DK 172223 B1 hindrer væsken i røret i at løbe ud, mens afspærrings-organet står åbent.The shut-off member is normally in the closed position, and the piston will first push the filtered material out to the shut-off member and fill the pipe volume between it and the adjacent outer position of the piston with the material, after which the piston can, upon subsequent activations, compact the material to the desired degree. the material is brought down, after which the locking means can be opened so that the plunger extends the drained material through the material outlet. The compacted material and the piston itself B prevent the liquid in the pipe from flowing out while the shut-off member is open.
Væsketabet er således nedbragt dels fordi indretningen er selvrensende, så periodevis tømning af 5 indretningen og de tilsluttede rør undgås, dels fordi væskeindholdet i det frafiltrerede materiale nedbringes ved sammenpresningen af materialet.The loss of liquid is thus reduced partly because the device is self-cleaning, so that periodic emptying of the device and the connected pipes is avoided, and partly because the liquid content of the filtered material is reduced by the compression of the material.
Indretningen ifølge opfindelsen giver således mulighed for kontinuert filtrering af æggeprodukter med 10 samtidig udførelse af hyppige rensningsbevægelser af rensestemplet, hvilket bevirker, at filteret holdes såpas rent, at filtreringen fortløbende kan foregå med stor kapacitet og uden overbelastning af æggeprodukterne .Thus, the device according to the invention allows for continuous filtration of egg products with simultaneous performance of frequent cleaning movements of the cleaning piston, which means that the filter is kept so clean that the filtration can be carried out at high capacity and without overloading the egg products.
15 Det foretrækkes, at stemplet er bevægeligt ud i afspærringsorganet, når dette står i åben stilling. Stemplet hindrer dermed væsken i at løbe ud, når det frafiltrerede materiale skubbes ud gennem materialeafgangen .It is preferred that the piston be movable in the locking member when in the open position. The piston thus prevents the liquid from flowing out when the filtered material is ejected through the material discharge.
20 I en udførelsesform aktiverer en styreenhed stemplet til at foretage flere rensende bevægelser hen langs filtervægpartiet, mens afspærringsorganet står i lukket stilling. Styreenheden giver en enkel mulighed for indstilling af driftsbetingelserne efter kvaliteten 25 af de æggeprodukter, der skal filtreres. Indstillingen kan med fordel ske ved hjælp af en timer, hvormed driftsperioden mellem hver stempelbevægelse er indstillelig, og styreenheden kan endvidere for opnåelse af god dræning af det bortfiltrerede materiale opret-30 holde et pressetryk på stemplet i en presseperiode ved afslutningen af stempelbevægelsen hen mod afspærringsorganet .In one embodiment, a controller activates the plunger to make multiple cleaning movements along the filter wall portion while the shut-off member is in the closed position. The control unit provides a simple option for setting operating conditions according to the quality of the egg products to be filtered. The adjustment can advantageously be effected by means of a timer by which the operating period between each piston movement is adjustable, and the control unit can further maintain a good pressure on the piston for a press period at the end of the piston movement towards the shut-off means for obtaining good drainage of the filtered material. .
I en kontruktivt og fremstillingsmæssig enkel og derfor ofte foretrukket udførelsesform er røret med 35 filtervægpartiet således monteret i et yderrør med 6 DK 172223 B1 større diameter, at ringrummet mellem yderrøret og røret er afspærret ved væsketilgangssiden, og drivorganet, fortrinsvis en pneumatisk stempel/cylinder-enhed, er monteret på et endedæksel på yderrøret, så 5 den med rensestemplet forbundne stempelstang er hovedsagelig koaksial med rørets længdeakse, og væsketilgangen er sluttet til yderrøret mellem endedækslet og røret med filtervægspartiet.In a contractually and fabricatively simple and therefore often preferred embodiment, the filter with the filter wall portion is mounted in a larger diameter outer tube such that the annular space between the outer tube and the tube is blocked at the liquid supply side, and the drive means, preferably a pneumatic piston / cylinder. unit, is mounted on an end cap of the outer tube so that the piston rod associated with the cleaning piston is substantially coaxial with the longitudinal axis of the tube and the fluid inlet is connected to the outer tube between the end cap and the tube with the filter wall portion.
Dette muliggør, at røret med filtervægpartiet på 10 enkel vis kan udformes som en udskiftelig filterindsats med udragende endeflanger, der ligger an mod tilhørende anlægsflader på indersiden af yderrøret. De to rør kan være koncentriske, og yderrøret kan uden mellemliggende elementer opfange den filtrerede væske, som løber ud af 15 filtervægpartiet.This allows the tube with the filter wall portion in a simple manner to be designed as a replaceable filter insert with protruding end flanges, which abut the associated abutment surfaces on the inside of the outer tube. The two tubes may be concentric and the outer tube may, without intermediate elements, capture the filtered liquid which exits the filter wall portion.
Anbringelsen af drivorganet og stempelstangen på væsketilgangssiden af filteret bevirker, at afspærringsventilen kan udformes uden hensyntagen hertil. Alternativt kan drivorganet ligge på materialeafgangs-20 siden af filtervægpartiet, men dette indebærer, at stempelstangen må passere gennem afspærringsorganet, hvilket komplicerer dettes udformning og virkemåde.The placement of the drive means and the piston rod on the liquid supply side of the filter allows the shut-off valve to be designed without regard to it. Alternatively, the drive means may lie on the material discharge side of the filter wall portion, but this implies that the piston rod must pass through the shut-off member, which complicates its design and operation.
Filtervægpartiet kan hensigtsmæssigt gå hele vejen rundt om røret og strække sig i længderetningen over en 25 afstand større end rensestemplets længde, fortrinsvis mindst dobbelt så langt. Ved at lade hele rørperiferien virke som filter opnås stor filterkapacitet i forhold til rørlængden, og stemplet bliver belastet mere jævnt, fordi materialet skal skrabes af filtret rundt langs 30 hele stempelperiferien. Når filteret har større længde end stemplet, vil en renset del af filteret blotlægges bag ved stemplet under dettes fremadgående bevægelse hen mod afspærringsorganet, så væskestrømningen gennem indretningen opretholdes, mens stemplet presser det 35 frafiltrerede materiale sammen.The filter wall portion may conveniently extend all the way around the tube and extend longitudinally over a distance greater than the length of the piston, preferably at least twice as long. By allowing the entire pipe periphery to act as a filter, great filter capacity is obtained in relation to the pipe length, and the piston is loaded more evenly because the material has to be scraped by the filter around the entire piston periphery. When the filter is longer in length than the piston, a cleaned portion of the filter will be exposed behind the piston during its forward movement towards the shut-off member so that fluid flow through the device is maintained while the piston compresses the filtered material.
7 DK 172223 B1 I en udførelsesform, som er meget ufølsom over for midlertidige aflejringer af frafiltreret materiale og endvidere tillader, at drivorganet for rensestemplet kan ligge på materialeafgangssiden, er afspærrings-5 organet en slangeventil med et i et trykkammer monteret elastisk slangestykke, som ved trykaflastet kammer har rørfacon med i det væsentlige samme diameter som rensestemplet og ved tryksat kammer er deformeret til en facon uden indre passage gennem slangestykket.In an embodiment which is very insensitive to temporary deposits of filtered material and further permits the drive means for the cleaning piston to lie on the material discharge side, the shut-off means is a hose valve with an elastic hose piece, which is mounted in a pressure chamber. pressure-relieved chamber has tubular shape of substantially the same diameter as the piston and, by pressurized chamber, is deformed into a shape without internal passage through the tubing.
10 Slangestykket vil lukke tæt, uanset om der i slangen skulle være efterladt lidt materiale, og også selv om stempelstangen passerer ud gennem ventilen, idet trykket i kammeret blot presser slangestykket tætnende sammen omkring det, der måtte findes inden i slange-15 stykket.The hose piece will close tightly, even if some material is left in the hose, and even if the piston rod passes out through the valve, the pressure in the chamber merely compressing the hose piece tightly around what may be found inside the hose piece.
I en alternativ udførelsesform er afspærringsorganet en ved materialeafgangen beliggende klapventil, som omfatter en stationær tætningsring af fleksibelt materiale med i det væsentlige samme indre diameter som 20 filtervægpartiet og en klap, som i lukket stilling er tætnende indført i tætningsringen, samt en mekanisme, der kan bevæge klappen mellem den lukkede stilling og en åben stilling, hvor klappen er trukket fri af tætningsringen. Klapventilen er en driftsikker og enkel 25 mekanisk konstruktion, der kan holdes lukket, selv om pressetrykket fra rensestemplet er højt. Da tætningsringen har samme indre diameter som filtervægpartiet, vil den slutte tætnende omkring stemplet i tidsrummet fra stemplet har skubbet det frafiltrerede materiale ud 30 gennem materialeafgangen, indtil klappen er bevæget tilbage til lukket stilling.In an alternative embodiment, the shut-off means is a flap valve located at the material outlet which comprises a stationary sealing ring of flexible material of substantially the same inner diameter as the filter wall portion and a flap sealed in the sealing ring in a closed position, as well as a mechanism capable of move the flap between the closed position and an open position where the flap is pulled free of the sealing ring. The flap valve is a reliable and simple mechanical structure that can be kept closed even though the pressure from the cleaning piston is high. Since the sealing ring has the same inner diameter as the filter wall portion, it will close sealingly around the piston over the period of time from the piston having pushed the filtered material out through the material outlet until the flap has moved back to the closed position.
Det foretrækkes, at rensestemplet i afstand fra sine endeflader har en udefter åben recess, og at mindst et aksialgående hul forbinder recessen med den 35 stempelendeflade, der ligger nærmest materialeafgangen.It is preferred that the cleaning piston spaced apart from its end faces has an outwardly open recess and that at least one axial extending hole connects the recess to the piston end face closest to the material discharge.
8 DK 172223 B1 Når stemplet under rensebevaegelsen presses ind i filtervægpartiet, vil den foran stempelendefladen værende væske dels undvige gennem filtervægpartiet beliggende foran stemplet, dels løbe gennem det aksial-5 gående hul i stemplet ind i recessen og derfra ud gennem filtervægpartiet. Ved den afsluttende kompak-tering af det frafiltrerede materiale kan væsken undvige gennem det aksialgående hul, så der ikke behøver at være et filtervægparti foran stemplet. Dette 10 giver den væsentlige fordel, at stemplet kan rense filtervægpartiet over stort set hele dettes længde, så filterkapaciteten udnyttes fuldt ud. Da kun en lille del af filtervægpartiet bliver blokeret af stemplet, bliver trykstødede i væsken fordelagtigt små under 15 rensebevaegelsen.8 DK 172223 B1 When the piston is pressed into the filter wall portion during the cleaning movement, the liquid present in front of the piston end surface will evade partly through the filter wall portion located in front of the piston and partly run through the axial passage hole in the piston into the recess and from there through the filter wall portion. Upon final compacting of the filtered material, the liquid can evade through the axial passage, so that there does not have to be a filter wall portion in front of the piston. This provides the essential advantage that the piston can clean the filter wall portion over virtually its entire length, so that the filter capacity is fully utilized. As only a small portion of the filter wall portion is blocked by the plunger, pressure shocks in the liquid are advantageously small during the cleaning movement.
Rensestemplet og også afspærringsorganet kan være indrettet til at aktiveres til bestemte tidspunkter, som kan bestemmes og indstilles på basis af driftserfaringer. I en mere automatiseret og dermed pålidelig 20 og mindre arbejdskrævende udformning måler to trykfølere anbragt på henholdsvis væsketilgangssiden og -afgangssiden af røret med filtervægpartiet differenstrykket over dette, og en styreenhed aktiverer drivorganet for rensestemplet, når differenstrykket over-25 stiger en forudbestemt grænseværdi. Da stemplet aktiveres, når filteret er tilstoppet i en forudfastsat grad, er indretningens korrekte funktion uafhængig af variationer i materialeindholdet i væsken.The cleaning piston and also the shut-off member may be adapted to be activated at certain times, which can be determined and adjusted based on operating experience. In a more automated and thus reliable 20 and less labor intensive design, two pressure sensors located on the liquid supply side and outlet side of the pipe with the filter wall portion, respectively, measure the differential pressure thereon, and a controller activates the drive for the piston when the differential pressure exceeds a predetermined limit value. Since the piston is activated when the filter is clogged to a predetermined degree, the proper functioning of the device is independent of variations in the material content of the liquid.
Stemplets tilbageføring kan som alternativ til 30 tidsfastsat tilbageføring automatiseres på basis af en konkret måling af stempelpositionen. Stempelpositionen kan naturligvis måles kontinuert, men for enkelheds skyld foretrækkes, at rensestemplet er tilknyttet en positionsføler, som afgiver signal, når stemplet er 35 bevæget hen til en forudbestemt position inden i 9 DK 172223 B1 filtervægpartiet. Positionssignalet kan anvendes til omskiftning af en styreventil i drivorganet for stemplet .Alternatively, the piston return can be automated based on a specific measurement of the piston position. The piston position can of course be measured continuously, but for simplicity it is preferred that the piston is associated with a position sensor which gives a signal when the piston is moved to a predetermined position within the filter wall portion. The position signal can be used to change a control valve in the piston drive means.
Komprimeringen af det frafiltrerede materiale kan 5 passende ske ved, at et pressetryk på rensestemplet opretholdes i en forudbestemt presseperiode, efter at positionsføleren har afgivet signal om, at stemplet har nået den forudbestemte position. Presseperioden kan indstilles ud fra driftserfaringer med de aktuelle 10 væsker. Alternativt kan stemplet simpelt hen være påvirket til bevægelse i presseretningen i et vist tidsrum, hvorefter stemplet returneres til udgangsstillingen .The compression of the filtered material may conveniently be effected by maintaining a pressure on the cleaning piston for a predetermined pressing period after the position sensor has issued a signal that the piston has reached the predetermined position. The press period can be set based on operating experience with the current 10 fluids. Alternatively, the plunger may simply be affected for movement in the pressing direction for a certain period of time, after which the plunger will be returned to its initial position.
Ved automatisering af tidspunktet for materialeud-15 tømningen kan væskespildet minimeres, ligesom unødvendig aktivering af afspærringsorganet kan undgås. Det foretrækkes derfor, at indretningen har en timer, som afgiver styresignal til åbning af afspærringsorganet, når et forudbestemt tidsrum er forløbet fra aktive-20 ringen af rensestemplet uden at positionsføleren har afgivet signal om, at stemplet har nået den forudbestemte position.By automating the time of material discharge, the liquid spill can be minimized, and unnecessary activation of the shut-off means can be avoided. It is therefore preferred that the device has a timer which provides a control signal for opening the shut-off means when a predetermined period of time has elapsed from the activation of the cleaning piston without the position sensor having emitted a signal that the piston has reached the predetermined position.
Eksempler på foretrukkene udførelsesformer for opfindelsen forklares herefter nærmere med henvisning 25 til den skematiske tegning, hvor fig. 1 - 3 viser et længdesnit gennem en indretning ifølge opfindelsen med stemplet vist i inaktiv stilling i fig. 1, i pressestilling i fig. 2 og i tømmestilling i fig. 3, og 30 fig· 4 et billede svarende til fig. l af en anden, foretrukket udførelsesform for opfindelsen.Examples of preferred embodiments of the invention are hereinafter explained in more detail with reference to the schematic drawing, in which fig. 1 - 3 show a longitudinal section through a device according to the invention with the plunger shown in the inactive position in fig. 1, in the pressing position of FIG. 2 and in the emptying position of FIG. 3 and 30, FIG. 4 is a view similar to FIG. 1 of another preferred embodiment of the invention.
I fig. 1 ses en generelt med 1 betegnet indretning til filtrering af væsker. Indretningen kan indgå i mange forskellige typer behandlingsanlæg, men er 35 specielt velegnet til brug i fødevareindustrien, hvor 10 DK 172223 B1 den filtrerede væske er en salgsvare eller skal anvendes ved fremstillingen af et slutprodukt, såsom kager, færdigretter eller mayonnaise. Ved en sådan behandlingsproces er det af betydning for processens 5 lønsomhed, at der ikke sker for store tab af væske.In FIG. 1, there is generally a device designated for filtering liquids. The device may be included in many different types of processing plants, but is particularly suitable for use in the food industry, where the filtered liquid is a commercial product or must be used in the manufacture of an end product such as cakes, ready meals or mayonnaise. In such a treatment process, it is important for the profitability of the process that excessive losses of fluid do not occur.
Indretningen er særlig anvendelig i ægbehandlings-anlæg, hvor eksempelvis æggehvide eller æggeblomme eller helæg (både hvide og blomme) efter knækning af æggene og samling af væsken skal renses for skalrester 10 og hvidestrenge, som er uønskede i det færdige produkt.The device is particularly useful in egg processing plants, where, for example, egg white or egg yolk or whole egg (both white and plum) after cracking the eggs and collection of the liquid must be cleaned of shell residue 10 and white strands which are undesirable in the finished product.
I et typisk anlæg kan der være tale om, at 2000 liter æggeblomme skal filtreres per time.In a typical plant, 2000 liters of egg yolk can be filtered per hour.
Indretningen omfatter et yderrør 2 med en tværgående væsketilgang 3 for ufiltreret væske og en tværgå-15 ende væskeafgang 4 for filtreret væske. Filtreringen sker i et rør med et filtervægparti 5. Filtervægpartiet er udformet på en rørformet indsats, som ved væsketilgangssiden bærer en radialt udragende, rundtgående flange 6, som ligger tætnende an mod indersiden af 20 yderrøret ved et forstærket vægafsnit 7 beliggende mellem væsketil- og -afgangen 3, 4. Indsatsen har i den modsatte ende en tilsvarende flange 8, som også ligger an mod yderrøret, så et ringrum 9 er afgrænset af indsatsen og yderrøret, og væsken fra tilgangen 3 er 25 tvunget til at strømme ind i indsatsen.The device comprises an outer tube 2 with a transverse liquid inlet 3 for unfiltered liquid and a transverse liquid outlet 4 for filtered liquid. The filtration takes place in a tube with a filter wall portion 5. The filter wall portion is formed on a tubular insert, which at the liquid supply side carries a radially projecting, circumferential flange 6, which seals against the inside of the outer tube at a reinforced wall section 7 located between the liquid and - the outlet 3, 4. The insert has at the opposite end a corresponding flange 8 which also abuts the outer tube, so that an annulus 9 is defined by the insert and the outer tube, and the liquid from the inlet 3 is forced to flow into the insert.
Filtervægpartiet 5 kan have huller, som er udstanset eller boret gennem væggen, så filtreringen sker gennem hullerne, eller flangerne kan være forbundet af langstrakte stivere, som bærer egentligt filtermateria-30 le, såsom et metalfilternet. Filtervægpartiet kan alternativt være opbygget som et såkaldt kantspaltefilter, dvs en metaltråd, som er spiralviklet på indersiden af de mellem flangerne 7 og 8 forløbende langstrakte stivere på en sådan måde, at der mellem vik-35 lingerne er en frispalte med en bredde afpasset efter 11 DK 172223 B1 den ønskede filterstørrelse. Det foretrækkes, at stort set hele vægpartiet mellem de to flanger virker som filter. Ved ægbehandling kan filterets maske- eller spaltevidde passende være fra 0,5 til 1,5 mm, fortrins-5 vis ca. 1 mm.The filter wall portion 5 may have holes punched or drilled through the wall so that the filtration takes place through the holes, or the flanges may be connected by elongated struts which carry actual filter material such as a metal filter mesh. Alternatively, the filter wall portion may be constructed as a so-called edge gap filter, ie a metal wire spirally wound on the inside of the elongated struts extending between the flanges 7 and 8 in such a way that there is a free slot between the windings having a width adapted to 11. DK 172223 B1 the desired filter size. It is preferred that virtually the entire wall portion between the two flanges acts as a filter. In egg processing, the mesh or slit width of the filter may suitably be from 0.5 to 1.5 mm, preferably approx. 1 mm.
Yderrøret er ved sin ene ende af spærret af et endedæksel 10, som bærer et drivorgan i form af en pneumatisk stempel/cylinderenhed 11 med tilhørende ikke viste styreventiler, som kan lede trykluft ind på den 10 ene eller anden side af stemplet, så dette forskydes i cylinderens længderetning. Drivorganets stempel er fast forbundet med en stempelstang 12, som passerer gennem et tætnet hul i endedækslet 10. Et stempel 13 til rensning af filterindsatsen er fastgjort til enden af 15 stempelstangen 12, så stemplet er forskydeligt koaksi-alt ind i og ud af indsatsen. Diameteren af stemplet 13's endeflade 14 svarer til inderdiameteren af filterindsatsen, hvilket betyder, at endefladen 14 skraber frafiltreret materiale bort fra indersiden af filter-20 væggen, når stemplet 13 føres ind i indsatsen.The outer tube is at one end of the barrier by an end cover 10 which carries a drive means in the form of a pneumatic piston / cylinder unit 11 with associated control valves not shown, which can direct compressed air into one or the other side of the piston so that it is displaced. in the longitudinal direction of the cylinder. The piston of the drive member is firmly connected to a piston rod 12 which passes through a sealed hole in the end cover 10. A piston 13 for cleaning the filter insert is attached to the end of the piston rod 12 so that the piston is displaceable coaxially into and out of the insert. The diameter of the piston 13 end surface 14 corresponds to the inner diameter of the filter insert, which means that the end surface 14 scrapes the filtered material away from the inside of the filter wall as the piston 13 is inserted into the insert.
Et afspærringsorgan i form af en slangeventil 15 er monteret koaksialt i forlængelse af filtervægpar-tiet. Slangeventilens hus 17 er ved hjælp af flanger 18 boltet fast til modsvarende flanger 19 på yderrøret.A shut-off member in the form of a hose valve 15 is mounted coaxially in extension of the filter wall portion. The housing 17 of the hose valve is bolted to corresponding flanges 19 on the outer tube by means of flanges 18.
25 Huset 17 har et indre rundtgående trykkammer 20, som gennem en tilslutning 21 og en omstillingsventil 22 kan forbindes til enten en fluidumhøjtrykskilde 23, fx trykluft, eller en drænport 24 ved atmosfæretryk.The housing 17 has an internal circumferential pressure chamber 20 which can be connected through either a connection 21 and a switching valve 22 to either a fluid high pressure source 23, e.g., compressed air, or a drain port 24 at atmospheric pressure.
Et slangestykke 25 er ved hver ende tryktæt 30 fikseret i en holdering 26, 27, der er således monteret i huset, fx ved hjælp af krympepasning, at slangestykket afgrænser trykkammeret indefter.A hose piece 25 is fixed at each end of pressure seal 30 in a retainer 26, 27 which is mounted in the housing, for example by shrink fit, that the hose piece defines the pressure chamber inward.
Et rørstykke 28 forbinder afspærringsorganet 15 med en materialeafgang antydet ved pilen 29, hvor det 35 frafiltrerede materiale bortledes.A pipe piece 28 connects the shut-off member 15 to a material discharge indicated by arrow 29 where the filtered material is discharged.
12 DK 172223 B112 DK 172223 B1
En første trykføler 30 måler væsketrykket på tilgangssiden af filterindsatsen, og en anden trykføler 31 måler væsketrykket på afgangssiden heraf. Gennem signalledninger 32 og 33 tilføres en styreenhed 34, der 5 kan være en elektronisk regneenhed, signaler for de målte tryk, og ved overskridelse af et forudbestemt differenstryk over filterindsatsen afgiver styreenheden gennem en signalledning 35 et styresignal til aktivering af drivorganet 11, så stemplet 13 presses ind i 10 indsatsen og renser filtervægpartiet.A first pressure sensor 30 measures the fluid pressure on the inlet side of the filter cartridge, and a second pressure sensor 31 measures the fluid pressure on the outlet side thereof. Through signal lines 32 and 33, a control unit 34, which may be an electronic calculator, supplies signals for the measured pressures, and upon exceeding a predetermined differential pressure across the filter insert, the control unit outputs through a signal line 35 a control signal for activating the drive means 11, then the plunger 13 is pressed into the insert and cleans the filter wall portion.
Styreenheden 34 er gennem en signalledning 36 i styrende forbindelse med omstillingsventilen 22. Gennem en yderligere signalledning 37 står styreenheden i forbindelse med en positionsføler 38, som afgiver et 15 styresignal, når drivorganets stempel befinder sig ud for føleren svarende til, at rensestemplet 13 er ført ind i filteret til en stilling, som i det mindste ønskes opnået ved hver aktivering af rensestemplet. Styreenheden indeholder desuden en indstillelig timer 2 0 3 9 til aktivering af afspærringsorganet 15 på den nedenfor beskrevne måde.The control unit 34 is through a signal line 36 in control with the switch valve 22. Through a further signal line 37, the control unit is in communication with a position sensor 38 which gives a control signal when the piston of the drive means is next to the sensor corresponding to the cleaning piston 13 being passed. into the filter to a position which is at least desired to be obtained upon each activation of the piston. The control unit further includes an adjustable timer 2 0 3 9 for activating the locking means 15 in the manner described below.
Indretningens virkemåde beskrives herefter nærmere. I den i fig. 1 viste sædvanlige driftstilstand står stemplet 13 i sin ene yderstilling, hvor det er 25 trukket helt fri af filtervægpartiet 5, så den ufil-trerede væske med det uønskede indhold af mere eller mindre fast materiale frit kan strømme ind i indsatsen, hvor væsken løber gennem filtervægpartiet og det mere eller mindre faste materiale, såsom æggeskaller og 30 hvidestrenge, afsættes på indersiden heraf. Omstillingsventilen 22 står i den stilling, hvor trykkammeret 20 er forbundet med højtrykskilden 23, der fx kan tryksætte kammeret til 6-7 bar, hvilket medfører sammenpresning af slangestykket 25, så passagen mellem 3 5 det indre af filterindsatsen og rørstykket 28 er af spærret.The operation of the device is then further described. In the embodiment shown in FIG. 1, the plunger 13 is in its one outer position where it is pulled completely free of the filter wall portion 5, so that the unfiltered liquid with the undesirable content of more or less solid material can freely flow into the cartridge where the liquid flows through the filter wall portion and the more or less solid material, such as egg shells and white strands, are deposited on the inside thereof. The switching valve 22 is in the position where the pressure chamber 20 is connected to the high pressure source 23 which can, for example, pressurize the chamber to 6-7 bar, which causes compression of the hose piece 25, so that the passage between the interior of the filter insert and the pipe piece 28 is blocked.
13 DK 172223 B1 Når der er afsat tilstrækkelig meget materiale på indersiden af filteret til at filtreringen hæmmes, hvilket eksempelvis kan svare til et differenstryk på I, 5 bar over filteret eller til en forudbestemt for-5 løben driftstid i intervallet fra ca. 30 sekunder til ca. 5 minutter, aktiverer styreenheden 34 drivorganet II, som presser stemplet 13 ind i indsatsen, hvor endefladen 14 skubber det frafiltrerede materiale hen mod slangestykket 25. I den i fig. 2 viste stilling er 10 filtervægpartiet 5a bag ved stemplet blotlagt, så filtreringen her kan fortsætte, og endefladen 14 er nået frem til en forudbestemt position, hvor en positionsføleren 38 monteret på drivorganet 11 aktiveres af drivorganets stempel og afgiver et signal til styreen-15 heden. Herefter opretholdes pressetrykket på stemplet i et forudbestemt tidsrum, såsom fra 2 til 3 sekunder for at dræne væske bort fra materialet indespærret mellem stemplet 13 og afspærringsorganet 15, hvorefter drivorganet 11 aktiveres til at føre stemplet tilbage 20 til udgangsstillingen.13 DK 172223 B1 When sufficient material is deposited on the inside of the filter to inhibit the filtration, which may, for example, correspond to a differential pressure of I, 5 bar above the filter or to a predetermined elapsed operating time in the range of approx. 30 seconds to approx. 5 minutes, the control unit 34 activates the drive means II, which presses the piston 13 into the insert, where the end surface 14 pushes the filtered material towards the hose piece 25. In the embodiment shown in FIG. 2, the filter wall portion 5a behind the piston is exposed so that the filtering here can continue and the end surface 14 has reached a predetermined position where a position sensor 38 mounted on the drive member 11 is actuated by the piston of the drive member and gives a signal to the controller 15 . Thereafter, the compressive pressure on the piston is maintained for a predetermined period of time, such as from 2 to 3 seconds to drain liquid away from the material entrapped between the piston 13 and the shut-off member 15, after which the actuator 11 is actuated to return the piston 20 to the initial position.
Disse filterrensende stempelbevægelser gentages, indtil rummet mellem afspærringsorganet 15 og stemplet 13 er så fyldt med frafiltreret materiale, at stemplet ikke længere kan presses hen til den stilling, hvor 25 positionsføleren 38 afgiver signal. Timeren 39 i styreenheden igangsættes samtidig med aktiveringen af drivorganet 11 og kan være indstillet til eksempelvis 30 sekunder. Hvis ikke styreenheden inden for dette forudindstillede tidsrum har modtaget besked fra 30 positionsføleren 38 om, at stemplet er nået frem til den forudbestemte stilling, aktiveres omstillingsventilen 22, og trykket i kammeret 20 afblæses til drænporten 24, hvorved slangestykket trækker sig sammen til den i fig. 3 viste ubelastede rørformede facon, som 35 tillader, at stemplet presser det frafiltrerede materi- 14 DK 172223 B1 ale ud gennem rørstykket 28 til materialeafgangen 29.These filter-cleaning piston movements are repeated until the space between the shut-off member 15 and the piston 13 is so filled with filtered material that the piston can no longer be pressed to the position where the position sensor 38 gives a signal. The timer 39 in the control unit is started simultaneously with the activation of the drive 11 and can be set to, for example, 30 seconds. If, within this preset time, the controller has not received message from position sensor 38 that the piston has reached the predetermined position, the switch valve 22 is activated and the pressure in the chamber 20 is de-energized to the drain port 24, thereby contracting the hose piece to that of FIG. . 3 shows the unloaded tubular shape, which allows the piston to push the filtered material out through the pipe piece 28 to the material outlet 29.
Stemplet 13 passer tætnende ind i filtervægspartiet og i passagen gennem den efterfølgende slangeventil, så væsken i røret holder sig på bagsiden af stemplet.The piston 13 fits snugly into the filter wall portion and into the passage through the subsequent hose valve so that the liquid in the tube stays on the back of the piston.
5 Når materialet er presset helt ud af afspærringsventilen, dvs. at stemplet er bevæget til sin yderste tømmestilling, trækker drivorganet 11 stemplet tilbage, og ventilen 22 omstilles, så kammeret 20 tryksættes og ventilen 15 lukker.5 When the material is squeezed completely out of the shut-off valve, ie. when the piston is moved to its extreme emptying position, the drive member 11 withdraws the piston and the valve 22 is reset so that the chamber 20 is pressurized and the valve 15 closes.
10 Istedet for en indsats kan røret med filtervæg- partiet være et fast rør med passende diameterspring, så stemplet 13 kan stå i inaktiv stilling i et rørafsnit med større diameter end filterafsnittet.Instead of an insert, the tube with the filter wall portion may be a fixed tube of appropriate diameter clearance so that the piston 13 may be in idle position in a tube section of larger diameter than the filter section.
I den efterfølgende beskrivelse af en alternativ 15 og foretrukket udførelsesform anvendes samme henvisningstal som ovenfor for elementer af samme art. For disse elementer henvises til ovenstående beskrivelse. Ændringerne angår pressestemplet, afspærringsorganet og filtervægpartiet.In the following description of an alternative 15 and preferred embodiment, the same reference numerals as above are used for elements of the same kind. For these elements, refer to the above description. The changes concern the plunger, the shut-off member and the filter wall portion.
2 0 I fig. 4 ses, at filtervægpartiet strækker sig helt hen til og er fikseret i et flangestykke 40, der er fastgjort til yderrøret 2 ved hjælp af ikke viste bolte, skruer eller lignende fastgøringsorganer. Flangestykket har en aksialt udefter åben recess 41, 25 hvori en tætningsring 42 er indsat og fastholdt ved hjælp af en spændring 43, der har udvendigt gevind og er skruet ind i modsvarende indvendigt gevind ved yderenden af flangestykket 40.In FIG. 4 it is seen that the filter wall portion extends fully and is fixed in a flange piece 40 which is secured to the outer tube 2 by means of bolts, screws or similar fasteners not shown. The flange piece has an axially outwardly open recess 41, 25 in which a sealing ring 42 is inserted and retained by means of a clamping ring 43 having an external thread and screwed into corresponding internal thread at the outer end of the flange piece 40.
Tætningsringen 42 er af fleksibelt materiale og 30 har samme eller lidt mindre indre diameter end filtervægpartiet . En ventilklap 44 med en anelse større ydre diameter end tætningsringens indre diameter er lejret på en bærearm 45 med mulighed for en vis begrænset svingebevægelse på eksempelvis 10° i forhold til armen.The sealing ring 42 is of flexible material and 30 has the same or slightly smaller internal diameter than the filter wall portion. A valve flap 44 with a slightly larger outer diameter than the inner diameter of the seal ring is mounted on a support arm 45 with the possibility of some limited pivotal movement of, for example, 10 ° relative to the arm.
35 Bærearmen 45 er således drejeligt lejret på en 15 DK 172223 B1 aksel 46, såsom et bolteskaft, i et stationært stativ 47, hvortil også yderrøret 2 er fikseret ved hjælp af monteringsstykker 48, at klappen 44 ved bærearmens drejning om akslen 46 kan trækkes ud af eller føres ind 5 i tætningsringen. På den i forhold til klappen 44 modsatte side af akslen 46 er bærearmen drejeligt lejret på en bøsning 47 med indvendigt gevind, hvori er indskruet en stempelstang 48 med udvendigt gevind. Stempelstangen kan længdeforskydes ved hjælp af et 10 stempel lejret i en pneumatisk cylinder 49, der aktiveres af styresignaler fra styreenheden 34 overført gennem en signalledning 56, når klapventilen skal åbne eller lukke. Den lukkede stilling af klappen kan finjusteres ved at skrue stempelstangen 48 mere eller 15 mindre ind i bøsningen 47. Bærearmen med tilhørende stempelstang og cylinder udgør således en mekanisme til åbning og lukning af ventilen.The support arm 45 is thus rotatably mounted on a shaft 46, such as a bolt shaft, in a stationary stand 47, to which also the outer tube 2 is fixed by means of mounting pieces 48, so that the flap 44 can be pulled out of the support arm by the rotation of the shaft 46. of or inserted 5 into the sealing ring. On the side opposite to the flap 44 of shaft 46, the support arm is pivotally mounted on an internal threaded socket 47, in which is screwed an outer threaded piston rod 48. The piston rod can be longitudinally displaced by means of a piston mounted in a pneumatic cylinder 49 which is actuated by control signals from the control unit 34 transmitted through a signal line 56 when the valve is to open or close. The closed position of the flap can be fine-tuned by screwing the piston rod 48 more or less into the bushing 47. Thus, the supporting arm and associated piston rod and cylinder constitute a mechanism for opening and closing the valve.
Den viste udførelsesform er særlig anvendelig til indretninger, hvor filtervægpartiets længdeakse står 20 lodret og klapventilen er bundmonteret, idet det frafiltrerede materiale ikke kan falde ned på cylinderen 49 under udtømningen. Hvis filtervægpartiets længdeakse ligger vandret, kan klappen 44 alternativt være monteret direkte på stempelstangen 48, og cylin-25 deren kan være monteret koaksialt med filtervægpartiets længdeakse, så klappen kan forskydes translatorisk frem og tilbage i akseretningen.The embodiment shown is particularly useful for devices where the longitudinal axis of the filter wall portion is 20 vertical and the flap valve is bottom mounted, since the filtered material cannot fall on the cylinder 49 during discharge. Alternatively, if the longitudinal axis of the filter wall portion is horizontal, the flap 44 may be mounted directly on the piston rod 48, and the cylinder 25 may be mounted coaxially with the longitudinal axis of the filter wall portion so that the flap can be displaced translationally back and forth in the axis direction.
Rensestemplet 13' har en i sin periferiflade udformet recess 50, der er åben radialt udefter og 30 strækker sig over størstedelen af stemplets længde, men ender i afstand fra stemplets endeflader 51, 52.The cleaning piston 13 'has a recess 50 formed in its circumferential surface, which is open radially outwardly and 30 extends over most of the length of the piston, but ending at a distance from the end faces 51, 52 of the piston.
Stemplet har således i tillæg til den forreste skrabe-/renseflade dannet af den hen mod materialeafgangen vendende endeflade 51 en sekundær skrabeflade 53 i form 35 af recessens fremadvendende endeflade, som finrenser 16 DK 172223 B1 filtervægpartiet for aflejringer, der opbevares i recessen, indtil stemplet føres tilbage til udgangsstillingen.Thus, in addition to the front scraper / cleaning surface formed by the end face 51 facing the material discharge, the piston has a secondary scraper surface 53 in the form 35 of the recess forward end surface which finely cleans the filter wall portion for deposits stored in the recess until the piston is returned to the initial position.
Recessen 50 bevirker også, at stemplet kun kan 5 dække filtervægpartiet ud for det forreste og det bageste stempelstykke hhv. 54 og 55, hvor stemplet har fuld diameter. Når stemplet føres ind forbi filtervægpartiet afbrydes væskeindstrømningen til partiet kortvarigt, indtil flangen 6 ligger ud for recessen 50, som 10 holder filtervægpartiet i strømningsforbindelse med tilgangen 3, indtil det bageste stempelstykke føres ind forbi flangen 6 og ligeledes giver en kortvarig afbrydelse af tilstrømningen.The recess 50 also causes the piston to cover only the filter wall portion next to the front and rear piston pieces, respectively. 54 and 55, with the plunger having full diameter. As the plunger is inserted past the filter wall portion, the liquid inflow to the portion is briefly interrupted until the flange 6 is adjacent to the recess 50, which 10 holds the filter wall portion in flow communication with the inlet 3 until the rear piston piece is inserted past the flange 6 and also provides a brief interruption of the flow.
Det forreste stempelstykke 54 har fire efter 15 omkredsen fordelte gennemgående boringer 56, der i løbet af den fremadgående stempelbevægeIse lader væsken foran stemplet strømme ind i recessen 50. Det bageste stempelstykke 55 afspærrer for væskepassage, når det befinder sig i filtervægpartiet, så væskeudløb hindres, 20 når klapventilen står åben.The front plunger 54 has four through 15 spaced through bores 56 which, during the forward plunger movement, allow the liquid in front of the plunger to flow into recess 50. The rear plunger 55 obstructs liquid passage as it is in the filter wall portion to prevent fluid outflow. 20 when the flap valve is open.
Enkeltelementer fra udførelsesformerne kan naturligvis kombineres efter ønske, ligesom andre modifikationer er mulige inden for opfindelsens område, eksempelvis kan drivorganet for rensestemplet være en 25 hydraulisk cylinder eller en elektrisk drevet motor, som indvirker på en længdeforskydelig tandstang.Of course, individual elements of the embodiments can be combined as desired, as are other modifications possible within the scope of the invention, for example, the drive for the piston may be a hydraulic cylinder or an electrically driven motor acting on a longitudinally displaceable rack.
Claims (14)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK043294A DK172223B1 (en) | 1994-04-14 | 1994-04-14 | Device for filtering liquids |
| IT95RM000232A IT1276527B1 (en) | 1994-04-14 | 1995-04-12 | LIQUID FILTRATION DEVICE. |
| NL1000135A NL1000135C2 (en) | 1994-04-14 | 1995-04-12 | Liquid filtration device. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK043294A DK172223B1 (en) | 1994-04-14 | 1994-04-14 | Device for filtering liquids |
| DK43294 | 1994-04-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DK43294A DK43294A (en) | 1995-10-15 |
| DK172223B1 true DK172223B1 (en) | 1998-01-12 |
Family
ID=8093466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK043294A DK172223B1 (en) | 1994-04-14 | 1994-04-14 | Device for filtering liquids |
Country Status (3)
| Country | Link |
|---|---|
| DK (1) | DK172223B1 (en) |
| IT (1) | IT1276527B1 (en) |
| NL (1) | NL1000135C2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0931578A1 (en) * | 1997-12-24 | 1999-07-28 | G. van Wijnsberghe en Co. NV | Method and apparatus for controlling the continuous filtration of liquids out of solid material from a substance to be thickened |
| EP0931577A1 (en) * | 1997-12-24 | 1999-07-28 | G. van Wijnsberghe en Co. NV | Method and apparatus for continuous high pressure filtration of liquids out of solid material from a substance to be thickened |
| NL1013113C2 (en) * | 1999-09-22 | 2001-03-23 | Coenraadts Machf B V | Plunger type liquid filtration apparatus, especially for filtering egg products, has central passage extending through plunger which is closed as plunger is raised |
| DE102007063240A1 (en) * | 2007-12-31 | 2009-07-02 | Mahle International Gmbh | separation device |
-
1994
- 1994-04-14 DK DK043294A patent/DK172223B1/en not_active IP Right Cessation
-
1995
- 1995-04-12 IT IT95RM000232A patent/IT1276527B1/en active IP Right Grant
- 1995-04-12 NL NL1000135A patent/NL1000135C2/en active Search and Examination
Also Published As
| Publication number | Publication date |
|---|---|
| NL1000135C2 (en) | 1996-03-19 |
| NL1000135A1 (en) | 1995-10-16 |
| DK43294A (en) | 1995-10-15 |
| ITRM950232A1 (en) | 1996-10-12 |
| IT1276527B1 (en) | 1997-11-03 |
| ITRM950232A0 (en) | 1995-04-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| B1 | Patent granted (law 1993) | ||
| PUP | Patent expired |
Expiry date: 20140414 |