NO165901B

NO165901B - FISH FARMING DEVICE.

Info

Publication number: NO165901B
Application number: NO884506A
Authority: NO
Inventors: Lars Frisk; Rolf Henriksen; Staffan Rissler
Original assignee: Flygt Ab
Priority date: 1987-11-26
Filing date: 1988-10-10
Publication date: 1991-01-21
Also published as: SE8704711L; NO884506D0; SE8704711D0; NO165901C; SE464217B; NO884506L

Description

Den foreliggende oppfinnelse vedrører en anordning for oppdrett av fisk, skalldyr etc. i et begrenset rom og av den art som er angitt i innledningen til det etterfølgende selvstendige krav 1. The present invention relates to a device for breeding fish, shellfish, etc. in a limited space and of the type specified in the introduction to the subsequent independent claim 1.

Et antall kasser for fisk er plassert i et lukket rom, f.eks. i form av et tankfartøy med et antall tanker, som hver og en inneholder flere kasser. A number of boxes for fish are placed in a closed room, e.g. in the form of a tanker with a number of tanks, each of which contains several boxes.

Tanken er fylt med vann og kassene er nedsenket i denne. Friskt vann tilføres hver kasses øvre del, mens forurenset vann føres bort fra den undre del slik at en relativ langsom, nedadrettet strømning skapes i kassen. The tank is filled with water and the boxes are immersed in it. Fresh water is supplied to the upper part of each box, while contaminated water is led away from the lower part so that a relatively slow, downward flow is created in the box.

Hensikten med den foreliggende oppfinnelse er å hindre at forurenset vann kan trenge tilbake til og inn i kassens øvre del og blandes med det tilførte friske vann. The purpose of the present invention is to prevent contaminated water from penetrating back to and into the upper part of the box and mixing with the supplied fresh water.

Ovenstående oppnås ved hjelp av de trekk som fremgår av karakteristikken til det etterfølgende selvstendige krav 1, samt av det etterfølgende uselvstendige krav 2. The above is achieved with the help of the features that appear from the characteristics of the subsequent independent claim 1, as well as from the subsequent non-independent claim 2.

En utførelsesform av oppfinnelsen vil bli omtalt i det etterfølgende med henvisning til tegningen hvis eneste figur viser et tverrsnitt av et fragmentarisk stykke av en tank samt en i tanken plassert kasse samt et fragment av en hosllggende kasse. An embodiment of the invention will be discussed in the following with reference to the drawing, the only figure of which shows a cross-section of a fragmentary piece of a tank as well as a box placed in the tank and a fragment of an adjacent box.

TJtførelsesformen i tegningen omfatter således et antall kasser 1 for fisk plassert ved et lukket rom, f.eks. i form av et tankfartøy med et antall tanker som hver og en inneholder flere kasser 1. The embodiment in the drawing thus includes a number of boxes 1 for fish placed in a closed room, e.g. in the form of a tanker with a number of tanks, each of which contains several boxes 1.

Tanken er fylt med vann og kassene 1 er nedsenket i denne. Hver kasse 1 består av en øvre del med ikke gjennomslippelig vegg 2, hvis øvre kant 3 er beliggende ovenfor vannflaten 4 i tanken, samt en undre del 5 med vanngjennomslippelig vegg og bunn 6. The tank is filled with water and the boxes 1 are immersed in this. Each box 1 consists of an upper part with an impermeable wall 2, whose upper edge 3 is located above the water surface 4 in the tank, as well as a lower part 5 with a water-permeable wall and bottom 6.

Friskt vann tilføres kassens øvre del, fortrinnsvis gjennom et inntil veggen liggende rør 7 forsynt med et antall på forskjellige nivåer beliggende hull 8. Disse hull rettes tangentielt slik at den roterende strømning og god inn-blanding skapes i kassens øvre del. Fresh water is supplied to the upper part of the box, preferably through a pipe 7 lying close to the wall provided with a number of holes 8 located at different levels. These holes are directed tangentially so that the rotating flow and good mixing is created in the upper part of the box.

Som innledningsvis nevnt, er kassens 1 nedre del 5 vanngjennomslippelig, hvilket innebærer at en nedadrettet strømning skapes i kassen 1. As mentioned at the outset, the lower part 5 of the box 1 is permeable to water, which means that a downward flow is created in the box 1.

Det forurensede vann strømmer ut gjennom kassens 1 fortrinnsvis konformede bunn 6, transporteres opp til flaten ved siden av kassen eller mellom kassene 9 og pumpes bort. The contaminated water flows out through the preferably conformal bottom 6 of the box 1, is transported up to the surface next to the box or between the boxes 9 and is pumped away.

Tilførselen av friskt vann begrenses hensiktsmessig slik at strømningen ikke forstyrrer sedimenteringen av forurensninger i kassens 1 nedre del 5. Gjennom en spesiell utforming 10 av denne, tvinges vannet til å strømme en viss strekning i horisontalretning med lav hastighet hvorved sedimentet rekker å bli avskilt. Først deretter skjer transporten opp til overflaten og dette vann er da så rent at det uten ulemper kan pumpes ut i resipienten, f.eks. havet. De sedimenterte forurensninger tas hånd om med spesielle anordninger. The supply of fresh water is appropriately limited so that the flow does not disturb the sedimentation of pollutants in the lower part 5 of the box 1. Through a special design 10 of this, the water is forced to flow a certain distance in a horizontal direction at a low speed whereby the sediment manages to be separated. Only then does the transport up to the surface take place, and this water is then so clean that it can be pumped out into the recipient without inconvenience, e.g. the sea. The sedimented pollutants are taken care of with special devices.

For å hindre forurenset vann fra atter å strømme inn i kassen 1, skapes en relativt smal sone 11 i nærheten av overgangen mellom kassens øvre og nedre del etter sedimen-ter ingsstrekningen , gjennom hvilken sone det forurensede vann passerer på sin vei oppad. Herved tilveiebringes en hastig-hetsøkning og en derav følgende trykksenkning i forhold til det trykk som råder i kassen 1. To prevent polluted water from flowing into the box 1 again, a relatively narrow zone 11 is created near the transition between the upper and lower parts of the box after the sedimentation section, through which zone the polluted water passes on its way up. This provides an increase in speed and a consequent reduction in pressure in relation to the pressure prevailing in box 1.

Claims

1. Device for rearing fish in boxes immersed in water where fresh water is continuously supplied, the box or boxes

(1) comprises an upper part with a watertight wall

(2) and a lower part (5) with a water-permeable wall and bottom (6), fresh water being continuously supplied to the upper part while polluted water is led away from the lower part so that a relatively slow, downward flow is created in the box, characterized by that at the transition between the upper and lower parts of the box, inwards and downwards inclined walls (10) are arranged, for the diversion of polluted water in a direction away from the center of the box (1), and that up to and outside the upper edge of these walls (10a) is arranged throats (11) through which the contaminated water flows on its way upwards, and by which an increase in speed is achieved, and a resulting pressure drop in relation to the pressure in the box.

2. Device according to claim 1, characterized by a number of holes (8) located at different levels by the wall in the upper part of the box (1) and so directed that a rotating flow is created in the box when fresh water is supplied through them.