CA1300599C - Mixer - Google Patents
MixerInfo
- Publication number
- CA1300599C CA1300599C CA000518486A CA518486A CA1300599C CA 1300599 C CA1300599 C CA 1300599C CA 000518486 A CA000518486 A CA 000518486A CA 518486 A CA518486 A CA 518486A CA 1300599 C CA1300599 C CA 1300599C
- Authority
- CA
- Canada
- Prior art keywords
- liquid
- slurry
- particulate material
- outlet
- volute chamber
- 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.)
- Expired - Fee Related
Links
Abstract
ABSTRACT
A mixer suitable for mixing a particulate material with a liquid. The mixer has a particulate material conduit, and a volute chamber disposed about the conduit.
The volute chamber has a liquid inlet and an open lower end through which the particulate material conduit extends, to define an annular liquid outlet of the volute chamber. A
transition cone communicates with the liquid outlet of the volute chamber and extends downward from it. At least a portion of the transition cone tapers inward while extending downward from a position not substantially lower than an outlet at the lower end of the conduit, to a position which is not substantially thereabove. Preferably the transition cone tapers as described, from a position above the conduit outlet to a position therebelow. A substantially straight downpipe is connected to, and extends downward from, a lower end of the transition cone. A mixing apparatus includes a mixer of the foregoing type, wherein the downpipe extends downward to a position spaced above the bottom wall of the tank.
A mixer suitable for mixing a particulate material with a liquid. The mixer has a particulate material conduit, and a volute chamber disposed about the conduit.
The volute chamber has a liquid inlet and an open lower end through which the particulate material conduit extends, to define an annular liquid outlet of the volute chamber. A
transition cone communicates with the liquid outlet of the volute chamber and extends downward from it. At least a portion of the transition cone tapers inward while extending downward from a position not substantially lower than an outlet at the lower end of the conduit, to a position which is not substantially thereabove. Preferably the transition cone tapers as described, from a position above the conduit outlet to a position therebelow. A substantially straight downpipe is connected to, and extends downward from, a lower end of the transition cone. A mixing apparatus includes a mixer of the foregoing type, wherein the downpipe extends downward to a position spaced above the bottom wall of the tank.
Description
~3~
MIXER
Field of the Invention This invention relates to a mix~r particularly suitable for mixing particulate material with a liquid.
I~hn~lsgy-Review In many applications, such as those relating to oil well s~rvicing, it is necessary to mix large amounts of a dry particulate material with a liquid. One such situation is in the mixin~ of cement slurry. Broadly, such mixing can be accomplished using either a batch or continuous process. A general problem with batch mixers is that they must ha~e a large mixture reservoir. This tends to make batch mixers bulky and heavy, and there~ore difficult to transport to various sites. Furthermore, such mixers require considerable clean up time, and in addition, do not readily permit rapid change in the characteristics of the mixture produced.
A number of continuous mixtures, particularly ~or mixing cement slurries, have been known in the past. For example, USP 3,298,669 to Zingg discloses a mixer which utilizes a venturi effect to educt the solid particulate material into the liquid. The particulate material is fed through a frusto-conical cone, the outlet of which is disposed wlthin another fru~to-conical cone. ~he annular space between the two cones forms a passage through which the liquid flows to educt the particulate matPrial from the inner frusto-conical membPr. An annular air passage is also provided around the outlet o~ the inner frusto-conical ~ember, in an attempt to crPate a layer of air between the liquid and particulate material being educked thereinto.
The air passage i6 provided to prevent the liquid from ~-40,045 -1- P12 (52986) ~3~S~
~plashing back to the inner frusto conical member, and possibly resulting in plugging to wetting o~ the particulate material USP 3,201,093 to Smith discloses a mixer having a vortex forming chamber into which the liguid may be tangentially directed. The chamber has a lower central opening, which in one embodiment may have a straight outlet pipe extending downward ther~fromO The particulate material is delivered through a conduit coaxial with the vortex forming chamber outlet, the outlet of which conduit may be positioned above the chamber, or within the downwardly extending outlet pipe. The entire apparatus is positioned above, and adjacent to, a baf~le plate or tank bottom. In operation, liquid ~rom the vortex in the chamber would exit through the liquid conduit or opening in the bottom of the chamber and draw the particulate material therewith.
However, as made clear in the patent, tha baffle or tank bottom was sufficiently close to the outlet conduit or outlet of the vortex forming chamber, such that substantially no mixing took place until the liquid and ~olid impinged upon the baffle plate or tank bottom. Thus, mixing was accomplished by the shear which resulted upon liquid and particles impinging upon the baffla or tank bottom at an angle.
USP 3,256,181 and USP 3,326,563, both to Zingg et al., alæo disclose a continuous mixing method and apparatus for accomplishing the same. The apparatus of both patents includes a pump which pumps th~ liguid into a circular chamber. An impeller is rotatably disposed in ~uch chamber and a hopper provided to feed the particulate material onto the rotating impeller. The resulting mixture is discharged through an outlet which exits the chamber tangentially.
Such apparatus of course does not rely upon any vortsx effect produced by the liquid itself, to aid in mixing the particulate material.
C-40,045 -2- P12 ~52986) 5~
USP 3,741,533 di~closes a mixing apparatus using a central particulate material conduit, and concentric liquid material conduit in the ~orm of an outer tubular element. A
first cylindrical liquid chamber is provided in communication with an upper end of the liquid conduit, while a second cylindrical chamber co~nunicates with an upper end of the tubular element and is disposed about the li~uid conduit between its lower and upper ends. In one embodiment wherein the liquid inlet i8 directed tangentially into the first cylindrical chamber, the outlets of the conduits and tubular element are sufficiently close to the bottom of the tank such that mixing takes place a~ a result of shear action when the particulate material, liquid, and recirculated slurry impinge upon the tank bottom. In another embodiment, the lower ends o~ the particulate material and liguid conduits are disposed upwardly within the outer tubular element. In such embodiment, the liquid enters the cylindrlcal liquid chamber in a radial direction such that a ~heet o~ liquid is formed hetween the dry bulk material leaving the particulate material conduit and the recirculated slurry.
USP 4,125,331 to Chisholm, discloses an apparatus somewhat 6imilar to that of USP 3,741,533. However, in the apparatu6 of the ~ormer patent, the liquid conduit is provided with an inwardly tapered lower portion. T~e innermost particle conduit can be raised and lowered within the liquid conduit, between a lower level with a lowermost end ad;acent to and abutting ~ lowermost end of the liquid conduit, and a position thereabove to control fluid flow.
The patent makes it clear that liguid which lea~es the lower most end of the tapered portion of the liquid conduit is immediately forced to ~wirl outwardly due to centrifugal forceD Of course, such outward and downward swirling or spiralling results 6ince the lower end of the tapered portion iB open, with no straight downwardly extending pipe 6ection co~nunicating therewith.
C-40,045 -3- P12 (52986) ~3~S~ 71456-57 U. S. Patent 4,007,721 to Zingg discloses a blender apparatus r which includes a first circular chamber into which a liquid is fed in a radially upward direction to produce a sheet of liquid which then mixes with dry particulate material from a hopper. The foregoing mixture is fed into one arm of a tangentially directed inlet of a volute chamber disposed within a slurry storage tank. Another arm of the inlet has a nozzle disposed therein for receiving recirculated slurry from the tank and directing it into the inlet of the volute. The patent 1~ indicates that as a result of the recirculation of slurry through the nozzle into the volute chamber within the tank, continuous circulation of the slurry mixture within the tank takes place.
None of the mixers of the above patents provides a particulate conduit disposed within an inwardly tapered liquid conduit to define an annular liquid outlet therebetween, throu~h which liquid can pass in a -vortex manner from a volute chamber, and into a straight downpipe.
Summary of the Invention According to a broad aspect of the invention there is provided a mixer suitable for mixing a particulate material with at least one of a liquid and a slurry, comprising: (a) a particulate material conduit having a particulate material inlet at an upper end thereof, and a particulate material outlet at a lower end thereof; (b) a volute chamber disposed about the particulate material conduit, between the inlet and outlet thereof, the volute chamber having: (i) a combined slurry and liquid inlet; (ii) an open lower end through which the particulate material conduit extends, the open lower end and the particulate ~3~QS~ 71456-57 material conduit together defining an annular combined slurry and liquid outlet; the combined slurry and liquid inlet and outlet being disposed so that at least one of liquid and slurry entering the combined slurry and liquid inlet at sufficient velocity can leave the combined slurry and liquid outlet in the form of a vortex; (c) a transition cone concentric with, outside of, and communicating with the combined slurry and liquid outlet of the volute chamber, and extending downward there~rom, the transition cone having a tapered portion starting above the com~ined slurry and liquid outlet and ending below it; and (d) a combined slurry and liquid conduit communicating with the combined slurry and liquid inlet of the volute chamber, the combined slurry and liquid conduit having: (i) a liquid carrying leg; lii) a nozzle disposed in the liquid carrying leg and aimed at the combined slurry and liquid inlet of the volute chamber so as to direct liquid flowing in the liquid carrying leg into the combined slurry and liquid inlet of the volute chamber; and (iii) a slurry carrying leg, said slurry carrying leg joi.ning with the liquid carrying leg, surrounding the nozzle and mating with the combined slurry and liquid inlet of the volute chamber, whereby slurry flowing in the slurry carrying leg enters the combined slurry and liquid inlet of 'che volute chamber.
According to another broad aspect of the invention there is provided a mixing apparatus suitable for mixing a particulate material with at least one of a liquid and a slurry, comprising: (a) a tank having a bottom wall; and (b) a mixer having: (i~ a particulate material conduit having a particulate material inlet at an upper end thereof, and a particulate .. - 5 -',~ ~
13~1S~3 material outlet at a lower end thereo~; (ii) a volute chamber disposed about the particulate material conduit, be-tween the inlet and outlet thereof, the volute chambe:r having a combined slurry and liquid inlet, and having an open lower end through which the particulate material conduit extends, the open lower end and the particulate material conduit together defining an annular combined slurry and liqui.d outlet; the combined slurry and liquid inlet and outlet being disposed so that at least one of liquid and slurry entering the combined slurry and liquid inlet at sufficient velocity can leave the combined slurry and liquid outlet in the form of a vortex; (iii) a transition cone concentric with, outside of, and communicating with the combined slurry and liquid outlet o:E the volute chamber, and e~tending downward therefrom, the transition cone having a tapered cone having a tapered portion starting above the combined slurry and liquid outlet and ending below it; and (iv) a combined slurry and liquid conduit communicating with the combined slurry and liquid inlet of the volute chamber, the combined slurry and liquid conduit having a liquid carrying leg and a nozzle disposed in the liquid carrying leg and aimed at the combined slurry and liquid inlet of the volute chamber so as to direct liquid flowing in the liquid carrying leg into the combined slurry and liquid inlet of the volute chamber, and a slurry carrying leg, said slurry carrying leg joining with the liquid carrying leg, surrounding the nozzle and mating with the combined slurry and liquid inlet of the volute chamber, whereby slurry flowing in the slurry carrying leg enters the combined slurry and liquid inlet of the volute chamber.
- 5a -~3~5~ 71456-57 The particulate material conduit, volute chamber, transition cone, and downpipe are preferably all coaxial.
A liquid conduit can additional]y be provided which communicates with the liquid inlet of the volute chamber. Such liquid conduit preferably has a first legr as well as a nozzle disposed in the first leg, preferably coaxially with the li~uid inlet of the volute chamber. In any event, the no~zle is aimed at the liquid inlet of the volute chamber so as to direct fluid flowing in the first leg into the liquid inlet thereof.
Mixers of the foregoing types are preferably used as a portion of a mixing apparatus. Such apparatus would typically include a tank with a bottom wall and a mixture outlet. The lower end of the pipe extending downward from the li~uid outlet of the volute chamber, is spaced above the bottom wall a sufficient distance such tha-t during operation of the apparatus to produce a vortex in the pipe, no substantial splashback will occur from the bottom wall of the tank into the pipe.
Drawings Embodiments of the invention will now be described with reference to the drawings in which:
Figure 1 is a right side elevation of a mixer o~ the present invention;
Figure 2 is a rear elevation thereof;
Figure 3 is a top view thereof;
- 5b -~3~
Figure 4 i~ a right ~ide elevation of a mixing apparatus of the present invention, and which includes the mixer o~ Figures 1 3:
Figure 5 as a ~ront ~ide elevation thereof;
Detailed ~escription of Embodiments Referring first to Figures 1-3, a mixer of the present invention will now be described. The mixer ~hown is designated by reference 2, and includes a particulate material conduit 4 with a particulate material inlet 6 at an upper end, and a particulate material outlet 8 at a lower end. A volute chamber 10 is di6posed about the aonduit 4 at a position between the inlet 6 and outlet 8. The volute chamber has tangential liqu~d inlet 12, an upper end 14 which i8 closed about aonduit 4, and an open lower end 16 through which conduit 4 extends to de~ine an annular liquid outlet 18 of volute 10. As a result of the foregoing arrangement, liquid entering liquid inlet 12 at ~ufficient velocity can leave outlet 18 in the form of a vortex.
The ~ixer further includes a transition cone 20 communicating with outlet lB and extending downward from it.
Transition cone 20 has a portion 22 which extends straight down from outlet 18, and a tapered portion 23 at a lower end of transition cone 20. Aæ will be seen particularly well from Flgures 1 and 2, portion 23 o~ transition cone 20 tapers inwaxd while extending downward from a position above particulate material conduit outlet 8, to a position below outlet 8. Portion 23 tapers inwardly at an acute angle as measured from the axis of transition cone 20. A straight downpipe 26 is connected to/ and extends downward ~rom, a lower end 25 of transition cone 20. As will be seen from Figures 1 and 2, downpipe 26 is longer than the tapered porti~n 23 of transition cone 20. In particular, ~ownpipe .
26 is between about 3 to about 4 times the length of portion 23.
C--40,045 -6- P12 (52g86) Referring to Figures 4 and 5, a mixing apparatus is shown wh~ch uses the mixer 2 of Figures 1-3. In addition though, mixer 2 as shown in Figures 4and 5, is provided with a liquid conduit 30. Conduit 30 has a first leg 31 and a nozzle 32 disposed in first leg 31. Noæzle 32 i6 coaxlal with liguid inlet 12 of volute chamber 10 and i6 aimed at inlet 12 so as to direct fluid flowing in first leg 31 into liguid inlet 12.
Liguid conduit 30 also has a second leg 36 with a by-pass arm 38, manually operable valves 40, 44 and an inlet 42, the ~unctlon of all of which shall become apparent shortly. The mixing apparatus further includes a tank 46 having a sloping bottom wall 48, with upper and lower ends 50, 52, respectively. A mixture outlet 54 communicates with the interior of tank 46 through the lower end 52 of bottom wall 48 thereof. Brackets 55 are provided to mount tank 46 in an upright position as illustrated in Figures 4 and 5. A
recirculation pipe 56, having an inlet 58, extends through an end wall of tank 46 to communicate with the interior of tank 46. A baffle 60 is disposed approximately midway between the ends of bottom wall 48. Baffle 60 is raised ~lightly above bottom wall 48 to create a ba~fle by-pass ~pace 62. Mixer 2 is mounted on a cover portion 64 of tank 46, with outlet 28 of downpipe 26 being spaced a distance 66 above bottom wall 45, in particular above a portion adjacent upper end 50 thereof. Distance 66 is sufficient such that during normal operation o~ the mixing apparatus no substantial splash~ack of liquid existing outlet 28 will occur from bottom wall 48, back into downpipe 26. For example, dist~nce 66 could be approximately 8 inches.
Operation of the above-described mixing apparatus, to ~ix a dry particulate material, in particular dry cement powder, with a liquid, in particular water, to produce a cement ~lurry, will now be described. However, it will be understood that the apparatus might be used for ~ixing other particulate materials, especially dry particulate materials, ~~40,045 -7 ~ 52986~
~3~J5~
with a liquid. In operationt then, first leg 31 of inlet conduit 30 i~ connected to a source of pressurized watsr.
Inlet 42 of second leg 36 communicates with an outlet of a cement slurry recirculation pump (not shown), the inlet of which communicates with outlet 54 of tank 46. ~he outlet o~
~uch recirculation pump can also communicate with another device for delivering these cement 61urries to the desired location, such as the inlet of a triplex pump as might be used in an oil well cementing operation. By-pass leg 38 may optionally be arranged to communicate with an inlet of an alternate mixing apparatus, for example a known cement eductor-type mixer, while inlet 58 of pipe 56, in ~uch case, would than communicate with the outlet of such alternate mixing apparatus. A source o~ powdered cement, which is nor~ally a metered source (e.g. controlled by a suitable valve), is arranged to communicate with inlet 6 of conduit 4.
In normal operatlon, valve 40 would be ~n an open position while valve 44 would be in a closed po~ition.
Water would enter inlet 12 of volute 10, from first leg 31, along with any recirculated 61urry from second leg 36. Both the water and recirculated 61urry would therefore enter a volute 10 tangentially. In particular, the water would enter volute 10 at a high velocity due to the pressure drop whiah will occur across nozzle 32. Providing the flow rate of water and/or recirculated ~lurry into volute 10 through inlet 12 i6 ~ufficient, then a vortex wi~l be created within volute 10 which can extend down through tran~ition cone 20.
As the water moves through transition cone 20, it will tend to educt particulate cement through outlet 8 of conduit 4.
In addition, due to the inward and downward taper of lower portion 23 of transition cone 20, the water and/or recirculated ~lurry mixture is ~orced to move inward in a path of convergence with particulate cement passing through outlet 8, thereby facilitating mixture of the particulate cement with the water and~or recirculated slurry mixture.
C-40,045 -8- P12 (529~) : L3Q~9~
The vortex action which will likely also extend a~ least partially down into downpipe 26, will also facilikate such mixing. The resul~ing mixture i~ di6charg~d from outlet 28 o~ down pipe 26 above an upper end 50 of tank bottom wall 48. ~owever, as mentioned earlier, d:Lstance 66 should be sufficient ~o that the resulting mixture will not impinge upon bottom wall 48 with 6ufficient force to produce any substantial splashback into down pipe 26. As a result, dry particulate cement which i6 exiting outlet 8, will not likely become wetted by any such splaF,hback to effect agglomeration of dry cement particles at outlet 8. If any substantial amount of 6uch agglomeration should occur, there is the pos~ibility that the mixer, and in partlcular outlet 8, could become clogged with agglomerated cement, Furthermore, if there was any substantial ~plashback from bottom wall 4 8 into down pipe 26, the vortex within downpipe 26 might be reduced as a result of euch substantial splashback, thereby possibily impeding mixing within downpipe 26.
When the mixing apparatus is initially started, any mixture exiting down pipe outlet 28 will flow downward onto tank bottom wall 48, through gap 62 under baffle 60, and into tank outlet 54. The downsloping arrangement of tank bottom wall 48 and the provision of gap 62, thereby assist in ~aintaining the prime of a pump which ~ight have lts inlet connec~ed to tank outlet 54. In addition, when a particular job is finished, the foregoing arrangement ensures that tank 46 can be emptied of cement slurry.
However, normally outlet 54 will receive most of its cement from overflow ~bove baffle 60.
As previously mentioned, cement slurry can be drawn off from the outlet o~ the recirculation pump, at a desired rate. Obviou61y, if it i8 desired to increase the rate at which such slurry i~ drawn off, without depleting the amount o~ slurry in tan~ 4 6, then the rate at which water is 6upplied through nozzle 32 and dry aemQnt supplied ~-40, 045 ~9- P12 (52986) ~13~ 3 through inlet 6, must be increased proportionally. In this regard, while the outlet 34 of nozzle 32, ~hould be as small as possible to allow for the greatest pressure drop and hence maximum velocity of water leaving nozzle 30, it must be ~u~ficiently large 80 as to be able to proYide the required water flow rate therethrough, bearing in mind the maximum water pressure which may be supplied through first leg 31 from a typical water pump. Thus for example, while a 3/45~ si~ oP nozzle opening 34 could deliver approximately 115 gallons per minute of water at 100 psi back pre~ure, a 1" size of opening 34 would be reguired to deliver approximately 265 gallons per minute at the same back pressure.
A mixing apparatus of the above-described type was constructed. ~he apparatus had a minimum diameter of volute 10 of approximately 10", a transition cone 20 of approximately 11'l in length (upper~iportion 22 being 10" wide and 5" long, with lower portion 23 tapering from 10" to 6"
dlameter at lower end 23 thereof), and with downpipe 26 having a 6" inside diameter and 19" length. The center of downpipe outlet ~ was spaced approximately 12" above tank bottom wall 48. In a number of trials, a nozzle 32 was used with an opening 34 diameter of approximately 1". Class H
Portland cement ~lurries were prepared in accordance with the procedure described above, w~th densities of the slurries between 16.5 and 17.7 pounds per gallon (as measured at atmospheric pressures). Sush slurries were withdrawn from tank outlet 54 at rates of between 1.5 to 9.2 barrels per minute ~"bpm") for slurries at the lower end of the ~oregoing density range, and at varying rates (including 8.5 bpm) for ~lurries. In further tests with such a mixing apparatus, various cement slurries were prepared at rates from 0.5 bpm to 4 bpm, and 8 to 12 bpm. In all cases, ~lurries of good consistency resulted without any apparent clogging of mixer 2.
C-4~,04~ -10- P12 (52986) ~L3~
Various ~odifications and alterations to the above embodiments will be apparent to those skilled in the art without departing from the scope of the invention.
Accordingly, the scope of the present invention should be determined with reference to the ~ttached Claims.
C-40,045 ~ P12 ~529~6)
MIXER
Field of the Invention This invention relates to a mix~r particularly suitable for mixing particulate material with a liquid.
I~hn~lsgy-Review In many applications, such as those relating to oil well s~rvicing, it is necessary to mix large amounts of a dry particulate material with a liquid. One such situation is in the mixin~ of cement slurry. Broadly, such mixing can be accomplished using either a batch or continuous process. A general problem with batch mixers is that they must ha~e a large mixture reservoir. This tends to make batch mixers bulky and heavy, and there~ore difficult to transport to various sites. Furthermore, such mixers require considerable clean up time, and in addition, do not readily permit rapid change in the characteristics of the mixture produced.
A number of continuous mixtures, particularly ~or mixing cement slurries, have been known in the past. For example, USP 3,298,669 to Zingg discloses a mixer which utilizes a venturi effect to educt the solid particulate material into the liquid. The particulate material is fed through a frusto-conical cone, the outlet of which is disposed wlthin another fru~to-conical cone. ~he annular space between the two cones forms a passage through which the liquid flows to educt the particulate matPrial from the inner frusto-conical membPr. An annular air passage is also provided around the outlet o~ the inner frusto-conical ~ember, in an attempt to crPate a layer of air between the liquid and particulate material being educked thereinto.
The air passage i6 provided to prevent the liquid from ~-40,045 -1- P12 (52986) ~3~S~
~plashing back to the inner frusto conical member, and possibly resulting in plugging to wetting o~ the particulate material USP 3,201,093 to Smith discloses a mixer having a vortex forming chamber into which the liguid may be tangentially directed. The chamber has a lower central opening, which in one embodiment may have a straight outlet pipe extending downward ther~fromO The particulate material is delivered through a conduit coaxial with the vortex forming chamber outlet, the outlet of which conduit may be positioned above the chamber, or within the downwardly extending outlet pipe. The entire apparatus is positioned above, and adjacent to, a baf~le plate or tank bottom. In operation, liquid ~rom the vortex in the chamber would exit through the liquid conduit or opening in the bottom of the chamber and draw the particulate material therewith.
However, as made clear in the patent, tha baffle or tank bottom was sufficiently close to the outlet conduit or outlet of the vortex forming chamber, such that substantially no mixing took place until the liquid and ~olid impinged upon the baffle plate or tank bottom. Thus, mixing was accomplished by the shear which resulted upon liquid and particles impinging upon the baffla or tank bottom at an angle.
USP 3,256,181 and USP 3,326,563, both to Zingg et al., alæo disclose a continuous mixing method and apparatus for accomplishing the same. The apparatus of both patents includes a pump which pumps th~ liguid into a circular chamber. An impeller is rotatably disposed in ~uch chamber and a hopper provided to feed the particulate material onto the rotating impeller. The resulting mixture is discharged through an outlet which exits the chamber tangentially.
Such apparatus of course does not rely upon any vortsx effect produced by the liquid itself, to aid in mixing the particulate material.
C-40,045 -2- P12 ~52986) 5~
USP 3,741,533 di~closes a mixing apparatus using a central particulate material conduit, and concentric liquid material conduit in the ~orm of an outer tubular element. A
first cylindrical liquid chamber is provided in communication with an upper end of the liquid conduit, while a second cylindrical chamber co~nunicates with an upper end of the tubular element and is disposed about the li~uid conduit between its lower and upper ends. In one embodiment wherein the liquid inlet i8 directed tangentially into the first cylindrical chamber, the outlets of the conduits and tubular element are sufficiently close to the bottom of the tank such that mixing takes place a~ a result of shear action when the particulate material, liquid, and recirculated slurry impinge upon the tank bottom. In another embodiment, the lower ends o~ the particulate material and liguid conduits are disposed upwardly within the outer tubular element. In such embodiment, the liquid enters the cylindrlcal liquid chamber in a radial direction such that a ~heet o~ liquid is formed hetween the dry bulk material leaving the particulate material conduit and the recirculated slurry.
USP 4,125,331 to Chisholm, discloses an apparatus somewhat 6imilar to that of USP 3,741,533. However, in the apparatu6 of the ~ormer patent, the liquid conduit is provided with an inwardly tapered lower portion. T~e innermost particle conduit can be raised and lowered within the liquid conduit, between a lower level with a lowermost end ad;acent to and abutting ~ lowermost end of the liquid conduit, and a position thereabove to control fluid flow.
The patent makes it clear that liguid which lea~es the lower most end of the tapered portion of the liquid conduit is immediately forced to ~wirl outwardly due to centrifugal forceD Of course, such outward and downward swirling or spiralling results 6ince the lower end of the tapered portion iB open, with no straight downwardly extending pipe 6ection co~nunicating therewith.
C-40,045 -3- P12 (52986) ~3~S~ 71456-57 U. S. Patent 4,007,721 to Zingg discloses a blender apparatus r which includes a first circular chamber into which a liquid is fed in a radially upward direction to produce a sheet of liquid which then mixes with dry particulate material from a hopper. The foregoing mixture is fed into one arm of a tangentially directed inlet of a volute chamber disposed within a slurry storage tank. Another arm of the inlet has a nozzle disposed therein for receiving recirculated slurry from the tank and directing it into the inlet of the volute. The patent 1~ indicates that as a result of the recirculation of slurry through the nozzle into the volute chamber within the tank, continuous circulation of the slurry mixture within the tank takes place.
None of the mixers of the above patents provides a particulate conduit disposed within an inwardly tapered liquid conduit to define an annular liquid outlet therebetween, throu~h which liquid can pass in a -vortex manner from a volute chamber, and into a straight downpipe.
Summary of the Invention According to a broad aspect of the invention there is provided a mixer suitable for mixing a particulate material with at least one of a liquid and a slurry, comprising: (a) a particulate material conduit having a particulate material inlet at an upper end thereof, and a particulate material outlet at a lower end thereof; (b) a volute chamber disposed about the particulate material conduit, between the inlet and outlet thereof, the volute chamber having: (i) a combined slurry and liquid inlet; (ii) an open lower end through which the particulate material conduit extends, the open lower end and the particulate ~3~QS~ 71456-57 material conduit together defining an annular combined slurry and liquid outlet; the combined slurry and liquid inlet and outlet being disposed so that at least one of liquid and slurry entering the combined slurry and liquid inlet at sufficient velocity can leave the combined slurry and liquid outlet in the form of a vortex; (c) a transition cone concentric with, outside of, and communicating with the combined slurry and liquid outlet of the volute chamber, and extending downward there~rom, the transition cone having a tapered portion starting above the com~ined slurry and liquid outlet and ending below it; and (d) a combined slurry and liquid conduit communicating with the combined slurry and liquid inlet of the volute chamber, the combined slurry and liquid conduit having: (i) a liquid carrying leg; lii) a nozzle disposed in the liquid carrying leg and aimed at the combined slurry and liquid inlet of the volute chamber so as to direct liquid flowing in the liquid carrying leg into the combined slurry and liquid inlet of the volute chamber; and (iii) a slurry carrying leg, said slurry carrying leg joi.ning with the liquid carrying leg, surrounding the nozzle and mating with the combined slurry and liquid inlet of the volute chamber, whereby slurry flowing in the slurry carrying leg enters the combined slurry and liquid inlet of 'che volute chamber.
According to another broad aspect of the invention there is provided a mixing apparatus suitable for mixing a particulate material with at least one of a liquid and a slurry, comprising: (a) a tank having a bottom wall; and (b) a mixer having: (i~ a particulate material conduit having a particulate material inlet at an upper end thereof, and a particulate .. - 5 -',~ ~
13~1S~3 material outlet at a lower end thereo~; (ii) a volute chamber disposed about the particulate material conduit, be-tween the inlet and outlet thereof, the volute chambe:r having a combined slurry and liquid inlet, and having an open lower end through which the particulate material conduit extends, the open lower end and the particulate material conduit together defining an annular combined slurry and liqui.d outlet; the combined slurry and liquid inlet and outlet being disposed so that at least one of liquid and slurry entering the combined slurry and liquid inlet at sufficient velocity can leave the combined slurry and liquid outlet in the form of a vortex; (iii) a transition cone concentric with, outside of, and communicating with the combined slurry and liquid outlet o:E the volute chamber, and e~tending downward therefrom, the transition cone having a tapered cone having a tapered portion starting above the combined slurry and liquid outlet and ending below it; and (iv) a combined slurry and liquid conduit communicating with the combined slurry and liquid inlet of the volute chamber, the combined slurry and liquid conduit having a liquid carrying leg and a nozzle disposed in the liquid carrying leg and aimed at the combined slurry and liquid inlet of the volute chamber so as to direct liquid flowing in the liquid carrying leg into the combined slurry and liquid inlet of the volute chamber, and a slurry carrying leg, said slurry carrying leg joining with the liquid carrying leg, surrounding the nozzle and mating with the combined slurry and liquid inlet of the volute chamber, whereby slurry flowing in the slurry carrying leg enters the combined slurry and liquid inlet of the volute chamber.
- 5a -~3~5~ 71456-57 The particulate material conduit, volute chamber, transition cone, and downpipe are preferably all coaxial.
A liquid conduit can additional]y be provided which communicates with the liquid inlet of the volute chamber. Such liquid conduit preferably has a first legr as well as a nozzle disposed in the first leg, preferably coaxially with the li~uid inlet of the volute chamber. In any event, the no~zle is aimed at the liquid inlet of the volute chamber so as to direct fluid flowing in the first leg into the liquid inlet thereof.
Mixers of the foregoing types are preferably used as a portion of a mixing apparatus. Such apparatus would typically include a tank with a bottom wall and a mixture outlet. The lower end of the pipe extending downward from the li~uid outlet of the volute chamber, is spaced above the bottom wall a sufficient distance such tha-t during operation of the apparatus to produce a vortex in the pipe, no substantial splashback will occur from the bottom wall of the tank into the pipe.
Drawings Embodiments of the invention will now be described with reference to the drawings in which:
Figure 1 is a right side elevation of a mixer o~ the present invention;
Figure 2 is a rear elevation thereof;
Figure 3 is a top view thereof;
- 5b -~3~
Figure 4 i~ a right ~ide elevation of a mixing apparatus of the present invention, and which includes the mixer o~ Figures 1 3:
Figure 5 as a ~ront ~ide elevation thereof;
Detailed ~escription of Embodiments Referring first to Figures 1-3, a mixer of the present invention will now be described. The mixer ~hown is designated by reference 2, and includes a particulate material conduit 4 with a particulate material inlet 6 at an upper end, and a particulate material outlet 8 at a lower end. A volute chamber 10 is di6posed about the aonduit 4 at a position between the inlet 6 and outlet 8. The volute chamber has tangential liqu~d inlet 12, an upper end 14 which i8 closed about aonduit 4, and an open lower end 16 through which conduit 4 extends to de~ine an annular liquid outlet 18 of volute 10. As a result of the foregoing arrangement, liquid entering liquid inlet 12 at ~ufficient velocity can leave outlet 18 in the form of a vortex.
The ~ixer further includes a transition cone 20 communicating with outlet lB and extending downward from it.
Transition cone 20 has a portion 22 which extends straight down from outlet 18, and a tapered portion 23 at a lower end of transition cone 20. Aæ will be seen particularly well from Flgures 1 and 2, portion 23 o~ transition cone 20 tapers inwaxd while extending downward from a position above particulate material conduit outlet 8, to a position below outlet 8. Portion 23 tapers inwardly at an acute angle as measured from the axis of transition cone 20. A straight downpipe 26 is connected to/ and extends downward ~rom, a lower end 25 of transition cone 20. As will be seen from Figures 1 and 2, downpipe 26 is longer than the tapered porti~n 23 of transition cone 20. In particular, ~ownpipe .
26 is between about 3 to about 4 times the length of portion 23.
C--40,045 -6- P12 (52g86) Referring to Figures 4 and 5, a mixing apparatus is shown wh~ch uses the mixer 2 of Figures 1-3. In addition though, mixer 2 as shown in Figures 4and 5, is provided with a liquid conduit 30. Conduit 30 has a first leg 31 and a nozzle 32 disposed in first leg 31. Noæzle 32 i6 coaxlal with liguid inlet 12 of volute chamber 10 and i6 aimed at inlet 12 so as to direct fluid flowing in first leg 31 into liguid inlet 12.
Liguid conduit 30 also has a second leg 36 with a by-pass arm 38, manually operable valves 40, 44 and an inlet 42, the ~unctlon of all of which shall become apparent shortly. The mixing apparatus further includes a tank 46 having a sloping bottom wall 48, with upper and lower ends 50, 52, respectively. A mixture outlet 54 communicates with the interior of tank 46 through the lower end 52 of bottom wall 48 thereof. Brackets 55 are provided to mount tank 46 in an upright position as illustrated in Figures 4 and 5. A
recirculation pipe 56, having an inlet 58, extends through an end wall of tank 46 to communicate with the interior of tank 46. A baffle 60 is disposed approximately midway between the ends of bottom wall 48. Baffle 60 is raised ~lightly above bottom wall 48 to create a ba~fle by-pass ~pace 62. Mixer 2 is mounted on a cover portion 64 of tank 46, with outlet 28 of downpipe 26 being spaced a distance 66 above bottom wall 45, in particular above a portion adjacent upper end 50 thereof. Distance 66 is sufficient such that during normal operation o~ the mixing apparatus no substantial splash~ack of liquid existing outlet 28 will occur from bottom wall 48, back into downpipe 26. For example, dist~nce 66 could be approximately 8 inches.
Operation of the above-described mixing apparatus, to ~ix a dry particulate material, in particular dry cement powder, with a liquid, in particular water, to produce a cement ~lurry, will now be described. However, it will be understood that the apparatus might be used for ~ixing other particulate materials, especially dry particulate materials, ~~40,045 -7 ~ 52986~
~3~J5~
with a liquid. In operationt then, first leg 31 of inlet conduit 30 i~ connected to a source of pressurized watsr.
Inlet 42 of second leg 36 communicates with an outlet of a cement slurry recirculation pump (not shown), the inlet of which communicates with outlet 54 of tank 46. ~he outlet o~
~uch recirculation pump can also communicate with another device for delivering these cement 61urries to the desired location, such as the inlet of a triplex pump as might be used in an oil well cementing operation. By-pass leg 38 may optionally be arranged to communicate with an inlet of an alternate mixing apparatus, for example a known cement eductor-type mixer, while inlet 58 of pipe 56, in ~uch case, would than communicate with the outlet of such alternate mixing apparatus. A source o~ powdered cement, which is nor~ally a metered source (e.g. controlled by a suitable valve), is arranged to communicate with inlet 6 of conduit 4.
In normal operatlon, valve 40 would be ~n an open position while valve 44 would be in a closed po~ition.
Water would enter inlet 12 of volute 10, from first leg 31, along with any recirculated 61urry from second leg 36. Both the water and recirculated 61urry would therefore enter a volute 10 tangentially. In particular, the water would enter volute 10 at a high velocity due to the pressure drop whiah will occur across nozzle 32. Providing the flow rate of water and/or recirculated ~lurry into volute 10 through inlet 12 i6 ~ufficient, then a vortex wi~l be created within volute 10 which can extend down through tran~ition cone 20.
As the water moves through transition cone 20, it will tend to educt particulate cement through outlet 8 of conduit 4.
In addition, due to the inward and downward taper of lower portion 23 of transition cone 20, the water and/or recirculated ~lurry mixture is ~orced to move inward in a path of convergence with particulate cement passing through outlet 8, thereby facilitating mixture of the particulate cement with the water and~or recirculated slurry mixture.
C-40,045 -8- P12 (529~) : L3Q~9~
The vortex action which will likely also extend a~ least partially down into downpipe 26, will also facilikate such mixing. The resul~ing mixture i~ di6charg~d from outlet 28 o~ down pipe 26 above an upper end 50 of tank bottom wall 48. ~owever, as mentioned earlier, d:Lstance 66 should be sufficient ~o that the resulting mixture will not impinge upon bottom wall 48 with 6ufficient force to produce any substantial splashback into down pipe 26. As a result, dry particulate cement which i6 exiting outlet 8, will not likely become wetted by any such splaF,hback to effect agglomeration of dry cement particles at outlet 8. If any substantial amount of 6uch agglomeration should occur, there is the pos~ibility that the mixer, and in partlcular outlet 8, could become clogged with agglomerated cement, Furthermore, if there was any substantial ~plashback from bottom wall 4 8 into down pipe 26, the vortex within downpipe 26 might be reduced as a result of euch substantial splashback, thereby possibily impeding mixing within downpipe 26.
When the mixing apparatus is initially started, any mixture exiting down pipe outlet 28 will flow downward onto tank bottom wall 48, through gap 62 under baffle 60, and into tank outlet 54. The downsloping arrangement of tank bottom wall 48 and the provision of gap 62, thereby assist in ~aintaining the prime of a pump which ~ight have lts inlet connec~ed to tank outlet 54. In addition, when a particular job is finished, the foregoing arrangement ensures that tank 46 can be emptied of cement slurry.
However, normally outlet 54 will receive most of its cement from overflow ~bove baffle 60.
As previously mentioned, cement slurry can be drawn off from the outlet o~ the recirculation pump, at a desired rate. Obviou61y, if it i8 desired to increase the rate at which such slurry i~ drawn off, without depleting the amount o~ slurry in tan~ 4 6, then the rate at which water is 6upplied through nozzle 32 and dry aemQnt supplied ~-40, 045 ~9- P12 (52986) ~13~ 3 through inlet 6, must be increased proportionally. In this regard, while the outlet 34 of nozzle 32, ~hould be as small as possible to allow for the greatest pressure drop and hence maximum velocity of water leaving nozzle 30, it must be ~u~ficiently large 80 as to be able to proYide the required water flow rate therethrough, bearing in mind the maximum water pressure which may be supplied through first leg 31 from a typical water pump. Thus for example, while a 3/45~ si~ oP nozzle opening 34 could deliver approximately 115 gallons per minute of water at 100 psi back pre~ure, a 1" size of opening 34 would be reguired to deliver approximately 265 gallons per minute at the same back pressure.
A mixing apparatus of the above-described type was constructed. ~he apparatus had a minimum diameter of volute 10 of approximately 10", a transition cone 20 of approximately 11'l in length (upper~iportion 22 being 10" wide and 5" long, with lower portion 23 tapering from 10" to 6"
dlameter at lower end 23 thereof), and with downpipe 26 having a 6" inside diameter and 19" length. The center of downpipe outlet ~ was spaced approximately 12" above tank bottom wall 48. In a number of trials, a nozzle 32 was used with an opening 34 diameter of approximately 1". Class H
Portland cement ~lurries were prepared in accordance with the procedure described above, w~th densities of the slurries between 16.5 and 17.7 pounds per gallon (as measured at atmospheric pressures). Sush slurries were withdrawn from tank outlet 54 at rates of between 1.5 to 9.2 barrels per minute ~"bpm") for slurries at the lower end of the ~oregoing density range, and at varying rates (including 8.5 bpm) for ~lurries. In further tests with such a mixing apparatus, various cement slurries were prepared at rates from 0.5 bpm to 4 bpm, and 8 to 12 bpm. In all cases, ~lurries of good consistency resulted without any apparent clogging of mixer 2.
C-4~,04~ -10- P12 (52986) ~L3~
Various ~odifications and alterations to the above embodiments will be apparent to those skilled in the art without departing from the scope of the invention.
Accordingly, the scope of the present invention should be determined with reference to the ~ttached Claims.
C-40,045 ~ P12 ~529~6)
Claims (14)
1. A mixer suitable for mixing a particulate material with at least one of a liquid and a slurry, comprising:
(a) a particulate material conduit having a particulate material inlet at an upper end thereof, and a particulate material outlet at a lower end thereof;
(b) a volute chamber disposed about the particulate material conduit, between the inlet and outlet thereof, the volute chamber having:
(i) a combined slurry and liquid inlet;
(ii) an open lower end through which the particulate material conduit extends, the open lower end and the particulate material conduit together defining an annular combined slurry and liquid outlet;
the combined slurry and liquid inlet and outlet being disposed so that at least one of liquid and slurry entering the combined slurry and liquid inlet at sufficient velocity can leave the combined slurry and liquid outlet in the form of a vortex;
(c) a transition cone concentric with, outside of, and communicating with the combined slurry and liquid outlet of the volute chamber, and extending downward therefrom, the transition cone having a tapered portion starting above the combined slurry and liquid outlet and ending below it; and (d) a combined slurry and liquid conduit communicating with the combined slurry and liquid inlet of the volute chamber, the combined slurry and liquid conduit having:
(i) a liquid carrying leg;
(ii) a nozzle disposed in the liquid carrying leg and aimed at the combined slurry and liquid inlet of the volute chamber so as to direct liquid flowing in the liquid carrying leg into the combined slurry and liquid inlet of the volute chamber;
and (iii) a slurry carrying leg, said slurry carring leg joining with the liquid carrying leg, surrounding the nozzle and mating with the combined slurry and liquid inlet of the volute chamber, whereby slurry flowing in the slurry carrying leg enters the combined slurry and liquid inlet of the volute chamber.
(a) a particulate material conduit having a particulate material inlet at an upper end thereof, and a particulate material outlet at a lower end thereof;
(b) a volute chamber disposed about the particulate material conduit, between the inlet and outlet thereof, the volute chamber having:
(i) a combined slurry and liquid inlet;
(ii) an open lower end through which the particulate material conduit extends, the open lower end and the particulate material conduit together defining an annular combined slurry and liquid outlet;
the combined slurry and liquid inlet and outlet being disposed so that at least one of liquid and slurry entering the combined slurry and liquid inlet at sufficient velocity can leave the combined slurry and liquid outlet in the form of a vortex;
(c) a transition cone concentric with, outside of, and communicating with the combined slurry and liquid outlet of the volute chamber, and extending downward therefrom, the transition cone having a tapered portion starting above the combined slurry and liquid outlet and ending below it; and (d) a combined slurry and liquid conduit communicating with the combined slurry and liquid inlet of the volute chamber, the combined slurry and liquid conduit having:
(i) a liquid carrying leg;
(ii) a nozzle disposed in the liquid carrying leg and aimed at the combined slurry and liquid inlet of the volute chamber so as to direct liquid flowing in the liquid carrying leg into the combined slurry and liquid inlet of the volute chamber;
and (iii) a slurry carrying leg, said slurry carring leg joining with the liquid carrying leg, surrounding the nozzle and mating with the combined slurry and liquid inlet of the volute chamber, whereby slurry flowing in the slurry carrying leg enters the combined slurry and liquid inlet of the volute chamber.
2. A mixer as defined in claim 1, wherein the particulate material conduit, the volute chamber, and the transition cone are all coaxial.
3. A mixer as defined in claim 1, wherein the nozzle is coaxial with the liquid inlet of the volute chamber.
4. A mixing apparatus suitable for mixing a particulate material with at least one of a liquid and a slurry, comprising:
(a) a tank having a bottom wall; and (b) a mixer having:
(i) a particulate material conduit having a particulate material inlet at an upper end thereof, and a particulate material outlet at a lower end thereof;
(ii) a volute chamber disposed about the particulate material conduit, between the inlet and outlet thereof, the volute chamber having a combined slurry and liquid inlet, and having an open lower end through which the particulate material conduit extends, the open lower end and the particulate material conduit together defining an annular combined slurry and liquid outlet;
the combined slurry and liquid inlet and outlet being disposed so that at least one of liquid and slurry entering the combined slurry and liquid inlet at sufficient velocity can leave the combined slurry and liquid outlet in the form of a vortex;
(iii) a transition cone concentric with, outside of, and communicating with the combined slurry and liquid outlet of the volute chamber, and extending downward therefrom, the transition cone having a tapered cone having a tapered portion starting above the combined slurry and liquid outlet and ending below it; and (iv) a combined slurry and liquid conduit communicating with the combined slurry and liquid inlet of the volute chamber, the combined slurry and liquid conduit having a liquid carrying leg and a nozzle disposed in the liquid carrying leg and aimed at the combined slurry and liquid inlet of the volute chamber so as to direct liquid flowing in the liquid carrying leg into the combined slurry and liquid inlet of the volute chamber, and a slurry carrying leg, said slurry carrying leg joining with the liquid carrying leg, surrounding the nozzle and mating with the combined slurry and liquid inlet of the volute chamber, whereby slurry flowing in the slurry carrying leg enters the combined slurry and liquid inlet of the volute chamber.
(a) a tank having a bottom wall; and (b) a mixer having:
(i) a particulate material conduit having a particulate material inlet at an upper end thereof, and a particulate material outlet at a lower end thereof;
(ii) a volute chamber disposed about the particulate material conduit, between the inlet and outlet thereof, the volute chamber having a combined slurry and liquid inlet, and having an open lower end through which the particulate material conduit extends, the open lower end and the particulate material conduit together defining an annular combined slurry and liquid outlet;
the combined slurry and liquid inlet and outlet being disposed so that at least one of liquid and slurry entering the combined slurry and liquid inlet at sufficient velocity can leave the combined slurry and liquid outlet in the form of a vortex;
(iii) a transition cone concentric with, outside of, and communicating with the combined slurry and liquid outlet of the volute chamber, and extending downward therefrom, the transition cone having a tapered cone having a tapered portion starting above the combined slurry and liquid outlet and ending below it; and (iv) a combined slurry and liquid conduit communicating with the combined slurry and liquid inlet of the volute chamber, the combined slurry and liquid conduit having a liquid carrying leg and a nozzle disposed in the liquid carrying leg and aimed at the combined slurry and liquid inlet of the volute chamber so as to direct liquid flowing in the liquid carrying leg into the combined slurry and liquid inlet of the volute chamber, and a slurry carrying leg, said slurry carrying leg joining with the liquid carrying leg, surrounding the nozzle and mating with the combined slurry and liquid inlet of the volute chamber, whereby slurry flowing in the slurry carrying leg enters the combined slurry and liquid inlet of the volute chamber.
5. An apparatus as defined in claim 4, wherein the nozzle is coaxial with the liquid inlet of the volute chamber.
6. A mixing apparatus as defined in claim 5, wherein the transition cone of the mixer, first extends straight downward from the liquid outlet of the volute chamber, to the tapered portion.
7. An apparatus as defined in claim 1, wherein the particulate material conduit, the volute chamber, and the transition cone are all coaxial.
8. A mixer as defined in claim 1, further comprising a substantially straight downpipe connected to, and extending downward from, a lower end of the transition cone.
9. A mixer as defined in claim 8, wherein the particulate material conduit, the volute chamber, the transition cone, and the downpipe are all coaxial.
10. A mixer as defined in claim 1, wherein at least a portion of said transition cone tapers inward while extending.
downward from a position not substantially lower than the particulate material conduit outlet, to a position which is not substantially above the particulate material conduit outlet.
downward from a position not substantially lower than the particulate material conduit outlet, to a position which is not substantially above the particulate material conduit outlet.
11. A mixing apparatus as defined in claim 4, further comprising a substantially straight downpipe connected to, and extending downward from, a lower end of the transition cone.
12. A mixing apparatus as defined in claim 11, wherein the downpipe is spaced above the bottom wall of the tank a sufficient distance such that during operation of the apparatus to produce a vortex in the downpipe no substantial splashback will occur from the bottom wall of the tank into the downpipe.
13. An apparatus as defined in claim 11, wherein the particule material conduit, the volute chamber, the transition cone, and the downpipe are all coaxial.
14. A mixer as defined in claim 4, wherein at least a portion of said transition cone tapers inward while extending downward from a position not substantially lower than the particulate material conduit outlet, to a position which is not substantially above the particulate material conduit outlet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US86955986A | 1986-06-02 | 1986-06-02 | |
| US869,559 | 1986-06-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1300599C true CA1300599C (en) | 1992-05-12 |
Family
ID=25353793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000518486A Expired - Fee Related CA1300599C (en) | 1986-06-02 | 1986-09-18 | Mixer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1013345B (en) |
| CA (1) | CA1300599C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112295429A (en) * | 2020-10-27 | 2021-02-02 | 周宁县善长祥农业机械研发有限公司 | Liquid mixer and mixing method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102824863A (en) * | 2012-09-11 | 2012-12-19 | 江西弘泰纸业有限公司 | High-efficiency disperser suitable for dispersing high-viscosity soluble powdered material in liquid |
| CN109278193B (en) * | 2018-10-25 | 2020-06-09 | 南京溧水高新创业投资管理有限公司 | Concrete accelerator feeder through fluid rotary mixing |
| CN114474403B (en) * | 2021-12-31 | 2023-11-21 | 平湖市开元混凝土股份有限公司 | Concrete distribution system |
-
1986
- 1986-09-18 CA CA000518486A patent/CA1300599C/en not_active Expired - Fee Related
-
1987
- 1987-06-01 CN CN 87103998 patent/CN1013345B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112295429A (en) * | 2020-10-27 | 2021-02-02 | 周宁县善长祥农业机械研发有限公司 | Liquid mixer and mixing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN87103998A (en) | 1988-01-20 |
| CN1013345B (en) | 1991-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4838701A (en) | Mixer | |
| US5046855A (en) | Mixing apparatus | |
| US6357906B1 (en) | Method and device for mixing a bulk material with a fluid | |
| CA2382708C (en) | Cement mixing system for oil well cementing | |
| EP1819429B1 (en) | Dry polymer hydration apparatus and methods of use | |
| EP0419280B1 (en) | Mixing apparatus | |
| US4257710A (en) | Continuous process mixing of pulverized solids and liquids and mixing apparatus | |
| SU1662342A3 (en) | Mixer of liquid and solid particles | |
| US4125331A (en) | Mixing apparatus | |
| US4688945A (en) | Mixing apparatus | |
| US3782695A (en) | Apparatus and method for dispersing solid particles in a liquid | |
| US4808004A (en) | Mixing apparatus | |
| EP0742043B1 (en) | Apparatus and method for mixing | |
| CA1300599C (en) | Mixer | |
| CA1121804A (en) | Continuous process mixing of pulverized solids and liquids and mixing apparatus | |
| GB1583389A (en) | Fluid mixing apparatus | |
| JPH04271821A (en) | Method and device for mixing solid particles and fluid | |
| EP1212132B1 (en) | Method for the leaching of solid matter from sludge | |
| US6672755B1 (en) | Equipment for mixing a powder with a liquid | |
| US5338779A (en) | Dry polymer activation apparatus and method | |
| US3563517A (en) | Cement slurry mixing system | |
| US6045255A (en) | Prewetting mixer | |
| JPS59228927A (en) | Method and device for mixing fluid material | |
| CN214486494U (en) | Thick thick liquid type engineering yellow epoxy priming paint equipment | |
| CN220990583U (en) | Jet device for hydraulic jet wet mixing powder material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |