EP0355082B1 - Jet ring - Google Patents
Jet ring Download PDFInfo
- Publication number
- EP0355082B1 EP0355082B1 EP89850233A EP89850233A EP0355082B1 EP 0355082 B1 EP0355082 B1 EP 0355082B1 EP 89850233 A EP89850233 A EP 89850233A EP 89850233 A EP89850233 A EP 89850233A EP 0355082 B1 EP0355082 B1 EP 0355082B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- jet ring
- inlet
- propeller
- rim
- 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.)
- Revoked
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/25—Mixers with both stirrer and drive unit submerged in the material being mixed
Definitions
- the invention concerns a jet ring of the type designed to surround the propeller in a so-called propeller mixer.
- Mixers of the above mentioned type include a driving unit, an electric motor, a propeller and a driving shaft between those two.
- the propeller may have two or more blades and can be arranged to be driven with varying speeds, all depending on the use.
- Mixers are used within various fields for homogenizing and suspension maintenance of liquids for different industrial processes, for liquid manure, for waste water etc.
- the mixer can be arranged horizontally or vertically or with different angles therebetween. It can also be arranged movable so that the flow from the mixer is brought to sweep over bigger areas or directed towards certain spots within the liquid tank.
- Another field where a mixer may be used is for creation of currents in a lake to prevent formation of ice.
- jet ring is cylindrically formed and provided with a somewhat outwards bent collar to make the inflow easier.
- jet rings are shown in the Swedish Design Registration No:s 34601 and 39392.
- a disadvantage with these known designs is that the flow close to the ring may be turbulent depending on a too sharp alteration. This causes so-called discontinuance of the boundary layer with an often unstable blocking as a result. The flow through the machine and thus the mixing ability then decreases.
- US-A-3365 178 shows a machine where vibrations are meant to be avoided by forming the jet ring with a smooth transition part.
- the ring is combined with a device for air intake and has an extremely low efficiency due to the elongated design of the concentric member.
- Fig 1 shows a side view of a mixer provided with a jet ring according to the invention.
- Fig 2 shows the jet ring seen in axial direction and
- Fig 3 shows a diagram over the fluid losses as a function of the ratio between the transition curve radius (r) and the diameter (D) of the jet ring.
- FIG. 1 stands for an electric motor, 2 a driving shaft, 3 a propeller with blades 4, 5 a jet ring with inlet and outlet rims 6 and 7 respectively.
- a jet ring 5 In order to obtain an effective mixing a jet ring 5 must thus be arranged around the propeller 3. In this way an axially directed jet is obtained which in its turn brings parts of the surrounding fluid mass.
- the flow towards and into the propeller has mainly a direction perpendicular to the axis of rotation.
- the ring is designed in a special way according to the invention.
- the conventional, mainly cylindric ring is replaced by a funnel shaped ring having a significant radial extension.
- the ratio betwen the axial and radial extensions of the jet ring may vary somewhat depending on number of revolutions, type of mixer, the qualities of the liquid to be mixed etc. It is important however, that the inlet rim is directed mainly radially and that the transition from inlet to outlet takes place along an even curve having a relatively big radius. The latter is of course dependant on the diameter of the ring. The bigger the ratio is between the transition radius and the ring diameter, the smaller the flow losses will be and thereby the disturbances (within certain limits). A ratio between 0.1 and 0.3 is normally sufficient. Bigger ratios may cause manufacturing problems.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Catching Or Destruction (AREA)
- Food-Manufacturing Devices (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8802902A SE8802902L (sv) | 1988-08-16 | 1988-08-16 | Straalring foer omroerare |
SE8802902 | 1988-08-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0355082A1 EP0355082A1 (en) | 1990-02-21 |
EP0355082B1 true EP0355082B1 (en) | 1993-05-12 |
Family
ID=20373081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89850233A Revoked EP0355082B1 (en) | 1988-08-16 | 1989-07-19 | Jet ring |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0355082B1 (ja) |
JP (1) | JPH0275333A (ja) |
AU (1) | AU614630B2 (ja) |
DE (1) | DE68906484T2 (ja) |
SE (1) | SE8802902L (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012205577B3 (de) * | 2012-04-04 | 2013-06-06 | Invent Umwelt-Und Verfahrenstechnik Ag | Horizontalrührwerk |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1446245A (en) * | 1923-02-20 | Assicotob tq- the eltsia jejstameled pbodtjcts | ||
US1510514A (en) * | 1921-12-10 | 1924-10-07 | Walker Noah | Agitator |
US1765386A (en) * | 1925-01-17 | 1930-06-24 | Nat Aniline & Chem Co Inc | Producing nonturbulent circulation of liquids |
FR1254351A (fr) * | 1960-04-19 | 1961-02-17 | Cofinin Company For Financial | Procédé de mélange d'une masse liquide hétérogène et dispositif agitateur correspondant |
CH433132A (de) * | 1965-02-26 | 1967-03-31 | Mowid Anstalt | Einrichtung zum Bewegen und Belüften von offenem Wasser |
CH593712A5 (en) * | 1975-04-29 | 1977-12-15 | Waelchli Andres | Aeration of fermenting liquid fertilisers - using propeller with surrounding flow guide into which air is drawn |
AU524892B2 (en) * | 1978-01-06 | 1982-10-07 | Mono Pumps Limited | Axial-flow and partly axial-flow pumps |
GB8334120D0 (en) * | 1983-12-21 | 1984-02-01 | Gerry U K | Diffusers |
-
1988
- 1988-08-16 SE SE8802902A patent/SE8802902L/ not_active Application Discontinuation
-
1989
- 1989-06-15 AU AU36436/89A patent/AU614630B2/en not_active Ceased
- 1989-07-07 JP JP1174342A patent/JPH0275333A/ja active Pending
- 1989-07-19 DE DE89850233T patent/DE68906484T2/de not_active Revoked
- 1989-07-19 EP EP89850233A patent/EP0355082B1/en not_active Revoked
Also Published As
Publication number | Publication date |
---|---|
SE8802902D0 (sv) | 1988-08-16 |
DE68906484T2 (de) | 1993-12-02 |
EP0355082A1 (en) | 1990-02-21 |
DE68906484D1 (de) | 1993-06-17 |
SE8802902L (sv) | 1990-02-17 |
JPH0275333A (ja) | 1990-03-15 |
AU614630B2 (en) | 1991-09-05 |
AU3643689A (en) | 1990-02-22 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
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17P | Request for examination filed |
Effective date: 19900315 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: ITT FLYGT AKTIEBOLAG |
|
17Q | First examination report despatched |
Effective date: 19920121 |
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NLR1 | Nl: opposition has been filed with the epo |
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RDAG | Patent revoked |
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27W | Patent revoked |
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GBPR | Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state |
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