EP0158048A2 - Mixing systems - Google Patents
Mixing systems Download PDFInfo
- Publication number
- EP0158048A2 EP0158048A2 EP85101696A EP85101696A EP0158048A2 EP 0158048 A2 EP0158048 A2 EP 0158048A2 EP 85101696 A EP85101696 A EP 85101696A EP 85101696 A EP85101696 A EP 85101696A EP 0158048 A2 EP0158048 A2 EP 0158048A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- fibers
- blades
- leading edge
- edges
- 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
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
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/91—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with propellers
-
- 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
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/86—Mixing heads comprising a driven stirrer
- B01F33/862—Mixing heads comprising a driven stirrer the stirrer being provided with a surrounding stator
Definitions
- the present invention relates to mixing systems, and particularly to methods and apparatus for mixing and circulating liquids having fibers suspended therein.
- the present invention is especially suitable for use in mixing systems designed to treat waste water by the circulation of the water in tanks with an axial flow impeller in a draft tube.
- the invention is also suitable for use in other mixing applications liquid is circulated with an axial flow impeller.
- a system for mixing liquids in a tank in accordance with the invention utilizes an impeller which has opposite edges which respectively lead and trail each other as the impeller rotates.
- This system is operative to circulate the liquids through the tank along a flow path which extends axially of the impeller.
- the adhesion of fibers suspended in the liquid along the leading edge of the impeller is decreased, thereby preventing increased drag on the impeller due to the accumulation of the fibers on the leading edge as the impeller rotates.
- the adhesion is decreased by inclining the leading edge with respect to a radial line from the axis of the impeller sufficiently to be greater than the angle of repose of the fibers on the impeller.
- the angle of repose is that angle where the forces normal to the leading edge are sufficient to hold the fibers against the leading edge, considering the coefficient of friction of the surface of the impeller at the leading edge with respect to the fibers.
- the leading edge presents an inclined plane with an inclination larger than the angle of repose. Accordingly, the fibers are not held with sufficient force to maintain them on the leading edge and they continue to circulate with the liquid. This is in spite of the absence of any significant radial component of flow; the flow being essentially axial, particularly where the impeller is an axial flow impeller in a draft tube.
- the adhesion of the fibers along the leading edge may also be decreased by providing the portion of the impeller adjacent the leading edge with a surface of low coefficient of friction material, such a low coefficient of friction may be provided by polishing.
- Low coefficient of friction material is preferably provided by utilizing a plastic material presenting a low coefficient of friction to the fibers.
- a tank 10 which may be used for the mixing of liquids, such as waste water, having fibers in suspension.
- a draft tube 12 having a conical upper section 14 and a cylindrical lower section 16, is suspended from a beam 18 by posts 20. The lower section may also be diverging.
- the beam 18 also carries a drive assembly 22 including an electric motor 24 and gearing 26. Suitable bearings in the gearing section 26 rotatably support a drive shaft 28.
- An impeller 30 having a plurality of blade 32 is connected to a hub 34 which is connected to and driven by the drive shaft 28.
- the draft tube sections 14 and 16 define an impeller way 36.
- a sparge ring may be mounted below the impeller 30 in the lower section 16.
- air may be inducted through holes in the blades for sparging purposes as described in U.S. Patent No. 4,231,974.
- the operation and advantages of the impeller way 36 are described in U.S. Patent No. 3,477,382. Further information respecting the design of draft tube mixing systems may also be obtained from U.S. Patent No. 4,385,206.
- the impeller 34 is an axial flow impeller.
- Each of the blades have an airfoil shape and cause the liquid in the tank to be circulated through the draft tube, preferably downwardly when the system is used for mixing and aerating, although upward circulation may also be used. Vanes (not shown), for example as described in U.S. Patent No. 4,231,974, may be used to further direct the flow axially of the impeller.
- the impeller has a plurality of blades, three blades 32 being used as shown in FIG. 2. Each of the blades is identical to the others. They are mounted 120° apart on the hub 34 and may be welded at their bases 35 to the hub 34.
- each blade 32 has an airfoil profile.
- the chord of the blade (CL) is measured between its leading edge 38 and its trailing edge 40.
- the blade has camber as measured between its midline 42 and chord.
- the blade also has twist, as shown in FIG. 3, in that the angle between the chord and the lower surface of the blade is greater at the base 35 of the blade than at the tip 44 thereof, and may be 10-18 0 greater.
- the camber may have a maximum length or value of from about 4 to 8 percent of the chord length.
- the location of the maximum chamber length may be from about 20% to about 60% of the chord length away from the leading edge 38 towards the trailing edge 40.
- the blade also has thickness between its upper and lower surfaces preferably from about 6 to 14 percent of the chord length.
- the width of the blade at the hub may be 22-28% of the chord length.
- the width of the blade at the tip may be 14-20% of the chord length.
- the tip chord angle (between the chord at the tip and the horizontal may be 5-25°.
- the blade may be constructed from a pair of plates 46 and 48, as shown in FIG. 4 which may be welded together near the leading and trailing edges.
- An insert 50 is provided in a portion extending approximately 10 percent of the length of each of the upper and lower surfaces from the leading to the trailing edges 38 and 40 of each blade 32. This insert is preferably a body of plastic materials which presents a surface having a low coefficient of friction.
- Ultra high molecular weight polyethlene (“UHMW”).
- UHMW ultra high molecular weight polyethlene
- TIVAR R Suitable material is available from Poly-Hi/Menasha Corp. under the trade name TIVAR R .
- Other material presenting a low coefficient of friction is suitable, for example a flouropolymer (such as known by the trade name Teflon). Ultra high molecular weight polyethelene is preferred.
- the tips 44 of the blades 32 have the shape of a sector of a circle and conform to the cylindrical inner periphery of the draft tube; extending to the inner periphery of the lower section 16, and separated therefrom only the necessary clearance to maintain manufacturing tolerances.
- the leading edge 38 is also longer than the trailing edge 40.
- the leading edge has an arcuate section 52 near the base end 35 and extends to a straight section 54.
- the trailing edge 40 is entirely straight.
- the arcuate section 52 is provided in order that the inclination of the leading edge can be sufficient so that the angle of repose of fibers which tend to accumulate on the leading edge is not reached.
- This angle of repose may be measured between the leading edge and radial lines extending from the axis 56 of the impeller (the center line of the shaft 28 and hub 34).
- the angle indicated as, 6, in FIG. 2 between a radial line 60 in a plane perpendicular to the axis 56 which intersects the leading edge 38 at a point 62, where the radial line has a length, R L , equal to 70 percent of the radius of the blade from the tip 44 to the axis 56 is 40°.
- This angle of inclination, 6, may be in a range from 20° to 60° depending upon the nature of the fibers which are suspended in the liquid being mixed and the coefficient of friction of the surface provided by the insert 50.
- a sufficient inclination angle 8 will suffice.
- the portion instead of providing an insert to present the portion of the surface at the leading edge with a low coefficient of friction, the portion may be polished.
- the low coefficient of friction material may be coated or otherwise bonded onto the surface.
- the impeller 30 may be provided with blades 64 of a design shown in FIG. 5. These blades may be of airfoil profile their leading edges 66 are sectors of a circle.
- the angle of inclination, 6, as in FIG. 2 is measured at the intersection 62 of the radial line 60 of length 70% of the radius to the top 70 of the blade with the leading edge 66.
- the center of the sector is shown at 68 along a line perpendicular to tangent line 72.
- the trailing edge 74 of the blade is made up of two arcs, one of which 76 is a sector of a circle having its center at 68 and the other of which 78 is also a sector of a circle having its center 80 within the blade 64.
- the portion 81 of the blade adjacent the leading edge 66 may be provided by an insert of low coefficient of friction material, similar to the insert 50.
- the other techniques mentioned above, for providing low coefficient of friction in the surfaces of the portion 81, may alternatively be used.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
- The present invention relates to mixing systems, and particularly to methods and apparatus for mixing and circulating liquids having fibers suspended therein.
- The present invention is especially suitable for use in mixing systems designed to treat waste water by the circulation of the water in tanks with an axial flow impeller in a draft tube. The invention is also suitable for use in other mixing applications liquid is circulated with an axial flow impeller.
- When waste water is mixed in tanks, as in the course of waste water treatments such as aeration, the power necessary to drive the impeller has been found to increase. After a period of time, which may be from one hour to four days, the required power to circulate the waste water sufficiently to mix and aerate it may increase up to 50%. The problem may be overcome by utilizing drive motors of higher power rating and bearing the cost of the increased power.
- The cause of this problem escaped appreciation until the time of this invention. In accordance with this invention, it was discovered that the drag on the impeller increased with time as a consequence of the accumulation of fibers on the leading edge of the impeller. In waste water, which arrives from a sewage system for treatment, the fibers are hair, rags (such as diapers and feminime products) and plastic bags. Other fiberous materials suspended in the liquid, which is circulated and mixed, also accumulates on the leading edge of the impeller with the same adverse effect.
- The problem has been found, in accordance with the invention, to be exacerbated when the liquid containing the fibers in suspension is circulated and mixed with an axial flow impeller in a draft tube arrangement. Then the velocity of the impeller blades through the liquid is several times the velocity of the liquid in the direction axially of the impeller and draft tube. There are components of drag on each of the ends of the fiber which are disposed on opposite sides of the leading edge of the blades of the impeller; thereby leaving no net force tending to pull the fiber off the impeller. The result of these drags is a force having a component normal to the leading edges of the impeller blades which holds the fibers on the leading edges, the fibers therefore cling tenaciously to the leading edges. In time the fibers accumulate and present a rough surface on the leading edge and around the leading portion of the blades which progressively increases the drag, decreases the lift and flow (pumping) and requires more and more driving power to maintain the velocity of the impeller necessary to obtain sufficient axial flow and circulation of the liquid. The efficiency and performance of the mixing system is therefore derrogated.
- Accordingly, it is the principal object of the present invention to provide an approved mixing system whereby mixing can be carried out with low drag on the impeller which circulates and mixes a liquid in spite of the presence of fibers, in suspension, in the liquid.
- It is a further object of the present invention to provide improved methods of and apparatus for mixing liquids, the performance and efficiency of which is not reduced when fibers are suspended in the liquid being mixed.
- It is a still further object of the present invention to provide improved mixing apparatus wherein axial flow is produced within a draft tube with an impeller having low drag characteristics even in the presence of fibers in the liquid being mixed.
- Briefly described, a system for mixing liquids in a tank in accordance with the invention utilizes an impeller which has opposite edges which respectively lead and trail each other as the impeller rotates. This system is operative to circulate the liquids through the tank along a flow path which extends axially of the impeller. The adhesion of fibers suspended in the liquid along the leading edge of the impeller is decreased, thereby preventing increased drag on the impeller due to the accumulation of the fibers on the leading edge as the impeller rotates. The adhesion is decreased by inclining the leading edge with respect to a radial line from the axis of the impeller sufficiently to be greater than the angle of repose of the fibers on the impeller. The angle of repose is that angle where the forces normal to the leading edge are sufficient to hold the fibers against the leading edge, considering the coefficient of friction of the surface of the impeller at the leading edge with respect to the fibers. Mechanically, the leading edge presents an inclined plane with an inclination larger than the angle of repose. Accordingly, the fibers are not held with sufficient force to maintain them on the leading edge and they continue to circulate with the liquid. This is in spite of the absence of any significant radial component of flow; the flow being essentially axial, particularly where the impeller is an axial flow impeller in a draft tube. The adhesion of the fibers along the leading edge may also be decreased by providing the portion of the impeller adjacent the leading edge with a surface of low coefficient of friction material, such a low coefficient of friction may be provided by polishing.' Low coefficient of friction material is preferably provided by utilizing a plastic material presenting a low coefficient of friction to the fibers.
- The foregoing and other objects, features and advantages of the invention, as well as presently preferred embodiments thereof and the best modes presently known for practicing the invention, will become more apparent from a reading the following description in connection with the accompanying drawings in which:
- FIG. 1 is a sectional view, in elevation, of a mixing system embodying the invention;
- FIG. 2 is a sectional view taken along the line 2-2 in FIG. 1, illustrating the low drag impeller provided in accordance with an embodiment of the invention in greater detail;
- FIG. 3 is an enlarged view, in elevation, illustrating one of the blades of the impeller shown in FIGS. 1 and 2;
- FIG. 4 is a sectional view of one of the blades of the impeller illustrating its airfoil shape and designating the chord, camber and thickeness of the blade, the section being taken along the line 4-4 in FIG. 2; and
- FIG. 5 is a view similar to FIG. 2 illustrating a low drag impeller in accordance with another embodiment of the invention.
- Referring more particularly to FIG. 1, there is shown a
tank 10 which may be used for the mixing of liquids, such as waste water, having fibers in suspension. Adraft tube 12, having a conicalupper section 14 and a cylindricallower section 16, is suspended from abeam 18 byposts 20. The lower section may also be diverging. Thebeam 18 also carries adrive assembly 22 including anelectric motor 24 and gearing 26. Suitable bearings in thegearing section 26 rotatably support adrive shaft 28. Animpeller 30 having a plurality ofblade 32 is connected to ahub 34 which is connected to and driven by thedrive shaft 28. Thedraft tube sections impeller way 36. When the system is used for mixing and aerating, a sparge ring may be mounted below theimpeller 30 in thelower section 16. Alternatively, air may be inducted through holes in the blades for sparging purposes as described in U.S. Patent No. 4,231,974. The operation and advantages of theimpeller way 36 are described in U.S. Patent No. 3,477,382. Further information respecting the design of draft tube mixing systems may also be obtained from U.S. Patent No. 4,385,206. - The
impeller 34 is an axial flow impeller. Each of the blades have an airfoil shape and cause the liquid in the tank to be circulated through the draft tube, preferably downwardly when the system is used for mixing and aerating, although upward circulation may also be used. Vanes (not shown), for example as described in U.S. Patent No. 4,231,974, may be used to further direct the flow axially of the impeller. The impeller has a plurality of blades, threeblades 32 being used as shown in FIG. 2. Each of the blades is identical to the others. They are mounted 120° apart on thehub 34 and may be welded at theirbases 35 to thehub 34. - As shown in FIGS. 3 and 4, each
blade 32 has an airfoil profile. The chord of the blade (CL) is measured between its leadingedge 38 and itstrailing edge 40. The blade has camber as measured between itsmidline 42 and chord. The blade also has twist, as shown in FIG. 3, in that the angle between the chord and the lower surface of the blade is greater at thebase 35 of the blade than at thetip 44 thereof, and may be 10-180 greater. In order to provide for axial flow, the camber may have a maximum length or value of from about 4 to 8 percent of the chord length. The location of the maximum chamber length may be from about 20% to about 60% of the chord length away from the leadingedge 38 towards thetrailing edge 40. The blade also has thickness between its upper and lower surfaces preferably from about 6 to 14 percent of the chord length. The width of the blade at the hub may be 22-28% of the chord length. The width of the blade at the tip may be 14-20% of the chord length. The tip chord angle (between the chord at the tip and the horizontal may be 5-25°. The blade may be constructed from a pair ofplates insert 50 is provided in a portion extending approximately 10 percent of the length of each of the upper and lower surfaces from the leading to the trailingedges blade 32. This insert is preferably a body of plastic materials which presents a surface having a low coefficient of friction. A suitable material is ultra high molecular weight polyethlene ("UHMW"). The molecular weight of this material is approximately 5 million. Suitable material is available from Poly-Hi/Menasha Corp. under the trade name TIVARR. Other material presenting a low coefficient of friction is suitable, for example a flouropolymer (such as known by the trade name Teflon). Ultra high molecular weight polyethelene is preferred. - It will also be observed that the
tips 44 of theblades 32 have the shape of a sector of a circle and conform to the cylindrical inner periphery of the draft tube; extending to the inner periphery of thelower section 16, and separated therefrom only the necessary clearance to maintain manufacturing tolerances. The leadingedge 38 is also longer than the trailingedge 40. The leading edge has anarcuate section 52 near thebase end 35 and extends to astraight section 54. The trailingedge 40 is entirely straight. Thearcuate section 52 is provided in order that the inclination of the leading edge can be sufficient so that the angle of repose of fibers which tend to accumulate on the leading edge is not reached. This angle of repose may be measured between the leading edge and radial lines extending from theaxis 56 of the impeller (the center line of theshaft 28 and hub 34). In a preferred embodiment, the angle indicated as, 6, in FIG. 2 between aradial line 60 in a plane perpendicular to theaxis 56 which intersects the leadingedge 38 at apoint 62, where the radial line has a length, RL, equal to 70 percent of the radius of the blade from thetip 44 to theaxis 56, is 40°. This angle of inclination, 6, may be in a range from 20° to 60° depending upon the nature of the fibers which are suspended in the liquid being mixed and the coefficient of friction of the surface provided by theinsert 50. - In some cases, in lieu of such an insert with low coefficient of friction, a sufficient inclination angle 8 will suffice. Also, instead of providing an insert to present the portion of the surface at the leading edge with a low coefficient of friction, the portion may be polished. In lieu of an
insert 50 the low coefficient of friction material may be coated or otherwise bonded onto the surface. For further information on coating techniques reference may be had to D.P. Willis, Jr., Increasing Lifetime with Flouropolymer Coatings, Appliance Engr. Vol. 7, No. 1 (1973 and D. P. Willis, Jr., Machine Design, April 10, 1980, pp. 123-127. - In the event that increased angles of inclination are desired, for example 50° or more the
impeller 30 may be provided withblades 64 of a design shown in FIG. 5. These blades may be of airfoil profile their leadingedges 66 are sectors of a circle. The angle of inclination, 6, as in FIG. 2, is measured at theintersection 62 of theradial line 60 oflength 70% of the radius to the top 70 of the blade with the leadingedge 66. The angle included between theradial line 60 and aline 72 tangent to the leadingedge 66 at thepoint 68. The center of the sector is shown at 68 along a line perpendicular totangent line 72. - The trailing
edge 74 of the blade is made up of two arcs, one of which 76 is a sector of a circle having its center at 68 and the other of which 78 is also a sector of a circle having itscenter 80 within theblade 64. - The portion 81 of the blade adjacent the leading
edge 66 may be provided by an insert of low coefficient of friction material, similar to theinsert 50. The other techniques mentioned above, for providing low coefficient of friction in the surfaces of the portion 81, may alternatively be used. - From the foregoing description it will be apparent that there has been provided an improved mixing system in which axial flow for circulation dnd mixing of liquids is provided without the derroqat ion of efficiency and performance which results from fibers suspended in the liquid being circulated and mixed. Variations and modifications in the herein described system, within the scope of the invention, will undoubtedly suggest themselves to those skilled in the art. Accordingly, the foregoing description should be taken as illustrative and not in a limiting sense.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US59910984A | 1984-04-11 | 1984-04-11 | |
US599109 | 1984-04-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0158048A2 true EP0158048A2 (en) | 1985-10-16 |
EP0158048A3 EP0158048A3 (en) | 1986-10-08 |
EP0158048B1 EP0158048B1 (en) | 1990-10-31 |
Family
ID=24398251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85101696A Expired - Lifetime EP0158048B1 (en) | 1984-04-11 | 1985-02-15 | Mixing systems |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0158048B1 (en) |
JP (1) | JPH0644981B2 (en) |
KR (1) | KR920000538B1 (en) |
AU (1) | AU569364B2 (en) |
CA (1) | CA1249809A (en) |
DE (1) | DE3580294D1 (en) |
GB (1) | GB2157185A (en) |
NZ (1) | NZ210861A (en) |
PH (1) | PH22693A (en) |
SG (1) | SG15392G (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0469302A1 (en) * | 1990-07-26 | 1992-02-05 | General Signal Corporation | Mixing impellers and impeller systems for mixing and blending liquids and liquid suspensions having a wide range of viscosities |
EP0651672A4 (en) * | 1993-01-21 | 1995-03-21 | Gen Signal Corp | Erosion resistant mixing impeller. |
BE1010118A3 (en) * | 1996-04-05 | 1998-01-06 | Magotteaux Int | Mixer propeller |
KR100462245B1 (en) * | 2002-07-15 | 2004-12-17 | 김승희 | Calcium chloride mixing feed system |
EP1738863A1 (en) * | 2005-06-30 | 2007-01-03 | SPX Corporation | Mixing impeller and method with top and bottom skin elements |
EP1738862A1 (en) * | 2005-06-30 | 2007-01-03 | SPX Corporation | Mixing impeller and method with pre-shaped tip elements |
EP1738861A1 (en) * | 2005-06-30 | 2007-01-03 | SPX Corporation | Mixing impeller and method with weld locations |
KR100852551B1 (en) | 2007-02-07 | 2008-08-18 | 대우조선해양 주식회사 | Precipitation preventing apparatus of vessel tank |
AU2006202877B2 (en) * | 2005-06-30 | 2010-12-02 | Spx Flow, Inc. | Mixing impeller and method with weld locations |
CN111998757A (en) * | 2020-08-28 | 2020-11-27 | 河海大学常州校区 | Device and method for measuring underwater repose angle of cohesive soil |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8617569D0 (en) * | 1986-07-18 | 1986-08-28 | Davidson J F | Impellers |
FR2784311B1 (en) * | 1998-10-09 | 2000-12-08 | Air Liquide | DEVICE FOR AGITATING A LIQUID IN A REACTOR AND FOR INJECTING A GAS IN THIS LIQUID |
JP2011240230A (en) * | 2010-05-17 | 2011-12-01 | Hitachi Plant Technologies Ltd | Operation method of agitator |
JP2015205250A (en) * | 2014-04-22 | 2015-11-19 | 日立造船株式会社 | Agitation device |
CN104959066B (en) * | 2015-06-12 | 2019-01-18 | 中国核电工程有限公司 | A kind of agitating paddle and agitating device for nuclear waste transmutation |
CN106422866B (en) * | 2016-09-27 | 2018-09-28 | 嘉兴晟源工业设计有限公司 | A kind of integral type medicine power stirrer with stirring and canned function |
WO2019073835A1 (en) * | 2017-10-12 | 2019-04-18 | 東レ株式会社 | Media type disperser and liquid dispersoid manufacturing method |
KR102527653B1 (en) * | 2021-01-13 | 2023-05-02 | 오브맘코리아컴퍼니 주식회사 | Nature 5-kind complex antibacteria raw material composite and manufacturing apparatus of the nature 5-kind complex antibacteria raw material composite |
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GB1528399A (en) * | 1975-06-18 | 1978-10-11 | Entat M | Propeller blades |
EP0015050A1 (en) * | 1979-01-29 | 1980-09-03 | General Signal Corporation | Fluids mixing apparatus |
US4378165A (en) * | 1980-12-30 | 1983-03-29 | General Signal Corporation | Draft tube apparatus |
EP0078660A2 (en) * | 1981-11-04 | 1983-05-11 | General Signal Corporation | Efficient axial flow impeller for mixing |
GB2113570A (en) * | 1982-01-25 | 1983-08-10 | Beloit Corp | Improvements in or relating to pulping apparatus |
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GB296247A (en) * | 1928-01-09 | 1928-08-30 | Pfaudler Co Inc | Improvements in or relating to rotary agitators |
GB1026384A (en) * | 1962-06-05 | 1966-04-20 | Activated Sludge Ltd | Improvements in or relating to aerators |
US3367423A (en) * | 1966-06-13 | 1968-02-06 | Cornelius W. Van Ranst | Propeller |
SE385819B (en) * | 1972-11-13 | 1976-07-26 | S Hjorth | PROPELLER |
US3870195A (en) * | 1973-04-26 | 1975-03-11 | Saco Lowell Corp | Apparatus for and method of feeding bobbin tubes |
JPS556081U (en) * | 1978-06-29 | 1980-01-16 | ||
JPS5639196U (en) * | 1979-09-04 | 1981-04-13 | ||
EP0079396A1 (en) * | 1981-11-12 | 1983-05-25 | Hans Kimmel | Propeller for a rotating mixer |
GB2143440A (en) * | 1983-07-21 | 1985-02-13 | Morton Robert Dg Ltd | Mixers |
JPS6119794U (en) * | 1984-07-10 | 1986-02-05 | 石川島播磨重工業株式会社 | fast breeder reactor |
-
1985
- 1985-01-11 AU AU37606/85A patent/AU569364B2/en not_active Ceased
- 1985-01-17 NZ NZ210861A patent/NZ210861A/en unknown
- 1985-01-21 JP JP60008929A patent/JPH0644981B2/en not_active Expired - Lifetime
- 1985-02-05 CA CA000473601A patent/CA1249809A/en not_active Expired
- 1985-02-15 DE DE8585101696T patent/DE3580294D1/en not_active Expired - Lifetime
- 1985-02-15 EP EP85101696A patent/EP0158048B1/en not_active Expired - Lifetime
- 1985-02-20 PH PH31886A patent/PH22693A/en unknown
- 1985-02-21 GB GB08504508A patent/GB2157185A/en not_active Withdrawn
- 1985-02-22 KR KR1019850001122A patent/KR920000538B1/en not_active IP Right Cessation
-
1992
- 1992-02-18 SG SG153/92A patent/SG15392G/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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GB1528399A (en) * | 1975-06-18 | 1978-10-11 | Entat M | Propeller blades |
EP0015050A1 (en) * | 1979-01-29 | 1980-09-03 | General Signal Corporation | Fluids mixing apparatus |
US4378165A (en) * | 1980-12-30 | 1983-03-29 | General Signal Corporation | Draft tube apparatus |
EP0078660A2 (en) * | 1981-11-04 | 1983-05-11 | General Signal Corporation | Efficient axial flow impeller for mixing |
GB2113570A (en) * | 1982-01-25 | 1983-08-10 | Beloit Corp | Improvements in or relating to pulping apparatus |
Cited By (13)
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EP0469302A1 (en) * | 1990-07-26 | 1992-02-05 | General Signal Corporation | Mixing impellers and impeller systems for mixing and blending liquids and liquid suspensions having a wide range of viscosities |
EP0651672A4 (en) * | 1993-01-21 | 1995-03-21 | Gen Signal Corp | Erosion resistant mixing impeller. |
EP0651672A1 (en) * | 1993-01-21 | 1995-05-10 | General Signal Corporation | Erosion resistant mixing impeller |
BE1010118A3 (en) * | 1996-04-05 | 1998-01-06 | Magotteaux Int | Mixer propeller |
KR100462245B1 (en) * | 2002-07-15 | 2004-12-17 | 김승희 | Calcium chloride mixing feed system |
EP1738862A1 (en) * | 2005-06-30 | 2007-01-03 | SPX Corporation | Mixing impeller and method with pre-shaped tip elements |
EP1738863A1 (en) * | 2005-06-30 | 2007-01-03 | SPX Corporation | Mixing impeller and method with top and bottom skin elements |
EP1738861A1 (en) * | 2005-06-30 | 2007-01-03 | SPX Corporation | Mixing impeller and method with weld locations |
US7481573B2 (en) | 2005-06-30 | 2009-01-27 | Spx Corporation | Mixing impeller with pre-shaped tip elements |
AU2006202877B2 (en) * | 2005-06-30 | 2010-12-02 | Spx Flow, Inc. | Mixing impeller and method with weld locations |
KR100852551B1 (en) | 2007-02-07 | 2008-08-18 | 대우조선해양 주식회사 | Precipitation preventing apparatus of vessel tank |
CN111998757A (en) * | 2020-08-28 | 2020-11-27 | 河海大学常州校区 | Device and method for measuring underwater repose angle of cohesive soil |
CN111998757B (en) * | 2020-08-28 | 2022-06-14 | 河海大学常州校区 | Device and method for measuring underwater repose angle of cohesive soil |
Also Published As
Publication number | Publication date |
---|---|
KR850007219A (en) | 1985-12-02 |
NZ210861A (en) | 1986-09-10 |
DE3580294D1 (en) | 1990-12-06 |
AU569364B2 (en) | 1988-01-28 |
JPS60227821A (en) | 1985-11-13 |
JPH0644981B2 (en) | 1994-06-15 |
GB2157185A (en) | 1985-10-23 |
PH22693A (en) | 1988-11-14 |
EP0158048A3 (en) | 1986-10-08 |
AU3760685A (en) | 1985-10-17 |
EP0158048B1 (en) | 1990-10-31 |
GB8504508D0 (en) | 1985-03-27 |
CA1249809A (en) | 1989-02-07 |
KR920000538B1 (en) | 1992-01-16 |
SG15392G (en) | 1992-04-16 |
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