Patent BG-2865-U1 (BG)
Title: Installation for oxygen enrichment of fish-farm basins
Inventor: TSVETKOV MILKO
IPC: C02F7/00
Filed: 2017-10-23
Abstract: The utility model relates to an installation for oxygen enrichment of fish-farm basins and finds application in industry, in particular in the fisheries sector. It consists of a vessel (1) closed by a bottom (3), as to the upper part (8) of the vessel (1) it has an inlet (4). The upper part (8) has a height of 55-60 cm, which is open at the top to receive the water flow. It is favourable to have a flow rate in the range of 40-50 l / s, as it can be provided by gravity inflowing water in the basin or by means of a low-pressure pump (11) through a connecting branch (17) mounted on the inlet (4). The middle part of the vessel (1) represents a mixing zone (10) for saturation of water with oxygen in the form of fine bubbles. The bottom part (9) of the vessel (1) is a drain unit and is connected to an outlet (5) for directing enriched with oxygen water to the fish-farm basin. To the vessel (1), in the mixing zone (10) is mounted an oxygen supply device (12). To the walls of the vessel (1), between the upper part (8) and the mixing zone (10) immovably is fixed crosswise located dividing partition (2), situated at the level of the water in the respective fish-farm basin. The height of the mixing zone (10) for oxygen saturation to the height of the upper part (8) is in the ratio 1: 4. In the dividing partition (2) are formed circular through openings (16) whereby the number of openings (16) is in functional dependence on the flow rate of the inflowing water. The openings (16) are with area greater than that of the inlet for the inflowing water. The incoming water in the upper part (8) of the vessel (1) creates a 55-60 cm high hydrostatic pressure and passes slowly through the openings (16) of the dividing partition (2) to the bottom part (9) of the vessel (1). The passing in the form of rain water through the openings (16) of the dividing partition (2) is enriched with oxygen in the mixing zone and flows through the outlet (5) in the direction of the flow of water. The mixing zone (10) by a nozzle (6) mounted in the walls of the vessel (1) is connected to the oxygen supply device (12). Through the dividing partition (2) adjacent to the wall of the vessel (1) is mounted a pipe (7) which is located below the level of the dividing partition (2), whereby this part of the pipe (7) is equal to the height of the mixing zone (10) for saturation with oxygen. The upper end of the pipe (7) is located above the level of the vessel (1) and represents an air-hole (15) for bringing out the unnecessary volume of oxygen into the atmosphere. When there is overshooting the amount of oxygen which can be absorbed by the device, the unnecessary volume leaves trough the air-hole (15) into the atmosphere. To the oxygen supply device (12) may be mounted an oxygen generator (18) or a cryogenic storage dewar (13) regulated by means of a rotameter (14) for reporting the instantaneous consumption of oxygen. The water passed through the installation saturates the entire water volume of the fish-farm basin with the fish grown. The installation can be constructed with different sizes, depending on the specifics and water volumes of the respective fish-farm basins, as it is allowed mounting of several installations in basins with larger areas.