EP0885057A1 - Device for mixing gas in a liquid - Google Patents
Device for mixing gas in a liquidInfo
- Publication number
- EP0885057A1 EP0885057A1 EP96910235A EP96910235A EP0885057A1 EP 0885057 A1 EP0885057 A1 EP 0885057A1 EP 96910235 A EP96910235 A EP 96910235A EP 96910235 A EP96910235 A EP 96910235A EP 0885057 A1 EP0885057 A1 EP 0885057A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- liquid
- housing
- nozzle
- tube
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
- B01F23/2334—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer
- B01F23/23341—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer with tubes surrounding the stirrer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
- B01F23/454—Mixing liquids with liquids; Emulsifying using flow mixing by injecting a mixture of liquid and gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
- B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
Definitions
- the present invention concerns a device for adding a gas to a liquid, particularly for use in connection with fish rearing tanks and in cleaning technique, as stated in the introductory part of Claim 1.
- the invention is particularly directed to use in rearing tanks.
- Adding gas to a liquid may be done for many reasons, such as to add anaesthetic gas when slaughtering fish in rearing tanks, for floatation basins in cleaning plants, adding oxygen to biofilters or for oxygenating the water in a rearing tank (tanks and large ponds).
- Such tasks may today be performed with different equipment, such as diffusors, ejector pumps, O 2 -columns, pond airing and deep shaft systems.
- US 4 844 843 discloses a device for adding gas to a liquid, at the same time as they are mixed.
- the device comprises an elongated tube for supply of liquid and gas, and a stirring mechanism inthe form of a motor driven propeller arranged by the outlet of the tube, for providing the liquid and the gas to be well mixed and that the mixture is driven out in the liquid reservoir. If increasing the gas supply to the liquid reservoir is desirable, the speed of the propeller is increased. However, an increase in the amount of gas added to the liquid in this known device, will have the side effect of changing the current rela- tionship. By increasing the speed of the propeller to supply more gas to the liquid, also the current in the reservoir will also increase.
- the jet should be controlled as to amount, pressure and direction, and thus give optimum tank hydraulics in different operating situations.
- Fig. 1 shows a longitudinal section view of a first, preferred embodiment of the present invention
- Fig. 2 shows a longitudinal section view of the venturi pipe and the nozzle pipe from the embodiment of Fig. 1, and
- Fig. 3 shows a longitudinal section view of a second embodiment of the present invention.
- a device according to the present invention, generally denoted 1.
- the device 1 comprises a pump 2 having a motor 3 connected to an operation shaft 4.
- a pump vane 5 At the outer end of the operating shaft 4 is connected a pump vane 5.
- the operating shaft 4 is arranged within a cylindrical housing 6, which in operation is partly submerged in water as shown in the drawing with an imagined water line.
- a first inlet In the house 6 is a first inlet
- a gas tube 7 which is best illustrated in Fig. 2.
- the gas tube 4 is at its upper end provided with an inlet opening for air and is at its lower end terminated in a nozzle 11 , having openings
- the gas tube 7 can be controlled in the longitudinal direction of housing 6, by means of a controlling means 15.
- the controlling means 15 comprises an adjustment bracket 16 connected to housing 6, and which contains a mounting bracket 18.
- the mounting bracket 18 is con-
- Block 20 is mounted to an upper holding plate 21 connected to the glass tube 7, and movable relative to housing 6.
- the upper holding plate 21 can move the glass tube 7, as the holding screw 19 slides in a slit (not shown) on the wall of the housing 6.
- the glass tube can be moved up and down in the housing 6,
- a jet tube 23 which is bent 90°, to extend the substantial of its length parallel with the housing 6.
- the jet tube 23 can also be positioned in other ways, for example when rearing flat fish, the jet tube 23 should be situated horizontally along the bottom of the rearing tank.
- Jet orifices 24 are situated along the jet tube 23, in its longitudinal direction.
- the jet orifices have clos ⁇ ure/controlling means (not shown), so that they can be individually closed, or controlled, respectively.
- a pressure controller 25 which functions as a pressure indicator and alarm transmitter.
- the motor 3 will drive the operating axle 4 and thus the pump vane 5 into rotation. Water will be drawn in from the second inlet opening 9 into the pump housing, and ejected out through the jet orifices 24 of the jet tube 23. Additionally, air that a conventional pump would have rejected as false air, is drawn in through the first inlet opening 8, and sucked through the openings 12 of the nozzle 11 of the nozzle tube 7.
- the air from the nozzle openings 12 is mixed into the water, in the form of bubbles. These bubbles are expanded in the underpressure created through the venturi 13.
- the pump vane When water has passed the venturi 13, the pump vane will, by whipping, cause the bubbles to divide in a plurality of smaller bubbles, that will be better distributed in the water leav ⁇ ing the jet tube 23.
- FIG. 3 is shown a second example of an embodiment of the present invention.
- air from the inlet opening 8 is not only sucked in by the pump vane 5, but also pumped in by a multiple step pump 27.
- the device is provided with a float 26, to ensure correct operation level in the liquid.
- Controlling the position of the nozzle 11 in relation to the venturi 13, and the velocity of the pump vane 5 can also be controlled automatically. This can be performed by means of electrical and/or hydraulic means, based on the background of desired flow velocity / flow relations and O 2 -concentration.
- the motor can be constructed horizontal and situ ⁇ ated below the water surface, having a short axle to the pump vane. In such an embodi- ment the thermal energy of the motor is supplied to the water of the tank.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Farming Of Fish And Shellfish (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO943285A NO180073C (en) | 1994-09-06 | 1994-09-06 | Device for adding a gas to a liquid |
CN96180152A CN1213986A (en) | 1994-09-06 | 1996-03-05 | Device for mixing gas in liquid |
CA002247262A CA2247262A1 (en) | 1994-09-06 | 1996-03-05 | Device for mixing gas in a liquid |
PCT/NO1996/000047 WO1997032661A1 (en) | 1994-09-06 | 1996-03-05 | Device for mixing gas in a liquid |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0885057A1 true EP0885057A1 (en) | 1998-12-23 |
EP0885057B1 EP0885057B1 (en) | 2001-09-12 |
Family
ID=27427466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96910235A Expired - Lifetime EP0885057B1 (en) | 1994-09-06 | 1996-03-05 | Device for mixing gas in a liquid |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0885057B1 (en) |
CN (1) | CN1213986A (en) |
AU (1) | AU710845B2 (en) |
CA (1) | CA2247262A1 (en) |
DE (1) | DE69615222T2 (en) |
DK (1) | DK0885057T3 (en) |
ES (1) | ES2163620T3 (en) |
NO (1) | NO180073C (en) |
WO (1) | WO1997032661A1 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT276262B (en) * | 1967-09-26 | 1969-11-25 | Hubert Fuchs | Mixing unit for introducing any additional substances as secondary components into liquids or stationary waters, in particular for the biological purification of water |
-
1994
- 1994-09-06 NO NO943285A patent/NO180073C/en unknown
-
1996
- 1996-03-05 CA CA002247262A patent/CA2247262A1/en not_active Abandoned
- 1996-03-05 EP EP96910235A patent/EP0885057B1/en not_active Expired - Lifetime
- 1996-03-05 DK DK96910235T patent/DK0885057T3/en active
- 1996-03-05 DE DE69615222T patent/DE69615222T2/en not_active Expired - Fee Related
- 1996-03-05 AU AU53485/96A patent/AU710845B2/en not_active Ceased
- 1996-03-05 WO PCT/NO1996/000047 patent/WO1997032661A1/en active IP Right Grant
- 1996-03-05 CN CN96180152A patent/CN1213986A/en active Pending
- 1996-03-05 ES ES96910235T patent/ES2163620T3/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9732661A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0885057B1 (en) | 2001-09-12 |
CA2247262A1 (en) | 1997-09-12 |
AU5348596A (en) | 1997-09-22 |
WO1997032661A1 (en) | 1997-09-12 |
ES2163620T3 (en) | 2002-02-01 |
DE69615222T2 (en) | 2002-06-13 |
DE69615222D1 (en) | 2001-10-18 |
NO943285L (en) | 1996-03-07 |
CN1213986A (en) | 1999-04-14 |
NO180073C (en) | 1997-02-12 |
NO180073B (en) | 1996-11-04 |
NO943285D0 (en) | 1994-09-06 |
DK0885057T3 (en) | 2002-01-21 |
AU710845B2 (en) | 1999-09-30 |
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