CA1128929A - One-piece agitator for closed vessel - Google Patents
One-piece agitator for closed vesselInfo
- Publication number
- CA1128929A CA1128929A CA315,027A CA315027A CA1128929A CA 1128929 A CA1128929 A CA 1128929A CA 315027 A CA315027 A CA 315027A CA 1128929 A CA1128929 A CA 1128929A
- Authority
- CA
- Canada
- Prior art keywords
- agitator
- impeller
- blades
- vessel
- opening
- 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
Links
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
- B01F27/05—Stirrers
- B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
- B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
- B01F27/0531—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials with particular surface characteristics, e.g. coated or rough
-
- 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
- B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
-
- 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
- B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/50—Mixing receptacles
- B01F35/511—Mixing receptacles provided with liners, e.g. wear resistant or flexible liners
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Accessories For Mixers (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A one piece enameled agitator is equipped with an impeller that can be wound or threaded through an opening that is smaller than the impeller diameter.
A one piece enameled agitator is equipped with an impeller that can be wound or threaded through an opening that is smaller than the impeller diameter.
Description
11~8929 ~ac~ground of the Invention:
This invention relates to a one-piece agitator, pre-ferably enameled, for use in closed enameled vessels having manhole openings therein.
There are three general types of enameled vessels.
In one type, frequently referred to as a two piece or clamp top vessel~ the entire top head of the vessel can be remov-ed. This facilitates installation of internal components such as agitators and baffles. However, this type of construction increases construction costs and-magnifies -sealing problems, particularly since adj`ustments of the seals may be necessary because of distortions of the vessel flanges during enameling of the vessel.
~nother typa of vessel, sometimes referred to as a one piece vessel ~ith an assembly opening, uses a top head - formed integrally with the body of the vessel, but with a relatively large openin~ in the head through which agita-tors and the like can be installed. Thus, relatively large container openings are still necessary, with the attendant production costs and sealing problems.
The third type of vessel, frequently referred to as a one piece or closed vessel, features an integral top head with relatively small openings such as pipe connections, openings for agitator and/or baffle shafts~ and manhole openings. The largest opening in a vessel of this type is usually the manhole, which is ty~ically much too s~all to admit a conventional one piece agitator of the si2e that would be desirable for many applications. Yhus, .,:, .. .
although this type o~ reactor minimi~es the construction -- 1 -- .
l ~B9~9 costs and sealin~ problems preserltccl by tlle clamp top vessel and the one piece vessel with the large asse~bly opening, it limits the type of agitator that can be install-ed in the vessel.
Separable enameled agitators--with individual ele~ents ehat can be introduced tllrougll a relatively snall opening such as a manhole and assembled inside the vessel--avoid the foregoing problems. UnEortunately, since the seals on these separable agitators are rela~ively inaccessible 10 and difficult to e~amine, and since these agitators are frequently exposed to highly corrosive conditions, it is difficult and expensive to provide reliable seals for these separable enameled agitators. ~loreover, even in the case of very expensive sealing constructions, the 15 connection points on the agitators form weak points where brea~downs can occur.
Sumr~ary of the Invention:
It is an object of this invention to provide a one piece agitator that may be completely enameled and then 20 inserted through an opening in a closed vessel, such as a manhole, which is considerably smaller than the diameter of the agitator impeller and which provides agitation comparable to other enamelled agitators.
These objects are achieved by using an agitator with 25 an impeller that can be wound or threaded through the manhole opening. In a preferred embodiment, a plurality of agitator blades are mounted on a ring segmellt which in turn is connected directly to the agitator shaft, preferably through an offset portion at the lower cnd 30 of the sha~t. Since this impeller can be threaded through a relatively small opening, such as a manhole, it can have an outer or circumferential diameter several times larger than thc greatest cross-section dimension of the manhole, and still be inserted through a conventional rlanhole in 35 a closed vessel. ~urtl-er advantages of this onc piece . ~ ,,, agitator construction, whicll can be completely enamelecl, are that the impeller blades can be curvcd to form a retreat curve impeller and can bc posltioned near the bottoM of the ves~el, and that, particularly ~ith highly viscous products, an additional mixing affect is obtained through the offset formation of the agitator shaft.
Drawings:
Figure 1 is a schematic sectional elevation view of a vessel containing an embodiment of this invention, with the agitator shown in perspective.
. ` Figure 2 is a schematic plan view of the vessel and . 10 agitator shown in Fi~ure 1.
Fi~ures 3-6 are schematic elevation views of other embodiments of this invention.
Detailed Description:
Figures 1 and 2 illustrate a preferred embodiment of this invention, with a one piece, completely enameled agitator mounted inside a typical closed enameled vessel 11. A manhole 17 and ail agitator mounting noz~le 8 are-provided in the top head of the vessel 11. An agitator . shaft 1 extends through the agitator nozzle ~. The -.
lower portion 2 of the agitator shaft is offset, and the agitator impeller is attached to the lo-wer end of the o~fset shaft connection 2. The impeller comprises a ring ~ ` shaped segment 3 and three agitator blades 4, 5 and 6 ex-: . tending from the ring segment.3. The agitator blades and ~; 25 the ring shaped segment 3 may all lie in a plane perpen-dicular to the axis of the agitator shaft 1, as illustrated in Figure 1. However, the agitator blades 4, S and 6 may also be inclined slightly upwards to conform to the gener-ally conical shape of the bottom.of the vessel 11 if it is desirable to position the agitator as close to tl~e bottom as possible.
As may be seen from Figures 1 and 2, there is an opening in the ring segment 3 which allows the ring segment - to be threaded through the manhole 11. With the illustra- -. 35 ted three blade impeller, the cut out section may be approximately 120. The agi~ator blades may be symmetric-ally arranged on the ring segment 3 with respect to rota-.
~z~9z9 tion, however, it r~lay be desirablc to dlsplace some of the agitator blades s.lightly from a symmetrical arrangement to help balance moments on the agitator, as will be e~plained in greater detail belo~.
Of course, more than three agitator blades may also be used. Generally, the agitator blades will be provided in the number and form desired for various mixing processes.
A preferred form has three blades, flattened to increase the heighth o the blades, with the~tips curved a~7ay from 10 the direction of rotation of the impeller. This type of construction, frequently referred to as a retreat curve . impeller, helps to circulate the material being mixed throughout the vessel. I~ith three flattened retreat curve agitator blades mounted on a ring segment such as the 15 one illustrated in Figures 1 and ~, the nixing efectobtained is comparable to that obtained with a conventional retreat curve i~peller, The maximum length of.the agitator blade can be chosen equal to the greatest diameter of the manhole 17, less 20 the necessary space for insertion o approximately 30 to 50~m. In order to provide an optimal assembly, a portion of the agitator shaft fastened to the ring se~ment 3 may - .- first run or a certain distance parallel to the agitator axis, as illustrated in Figure 1. T~?is type of agitator 25 can be directly mounted through an ordinary.manhole open-- ing 17 of a one piece container. Thus, insertion and mounting of the agitator does not require any openings larger than the manhole opening that is usually present, An agitator drive mechanism (not shown) is generall~
30 attached to the agltator above the agitator mounting nozxle .8. Also, a conventional finger shaped, ~-shaped or paddle ~hapcd bafle 9 is typically used with the agitators of this invention. The baffle 9, which can also be inserted through the manhole opening 17, is mounted in a conventional 35 baffle mounting no~zle or opening 10.
Pecause of the special construction of the agitators ~ of this invention, ~oments are produccd at the point ~hcre ~1289~9 the agitator is supported in no~zle 8, arising both frol~
the Eorces of flow and also from centrifugal force~. These moments should be compensated for or balanced to insurc satisfactory functioning of the shaft sealing, and to avoia S the need to oversize the agitator shaft and/or drive unit to prevent overloading in case greater drive po~ers are required.
The flow forces on the offset portion 2 of the agita-tor shaft generate moments on the agitator in different planes perpendicular to the axis o rotation. The mo~ents on the,agitator shaft and/or the agitator mounts and seals arising therefrom can be compensated for by slightly varying the height of one or more of the agitator blades 4, S and 6 relative to the other blades or, as is shown in Figure 2, by mounting some of the agitator blades in a position that deviates from a symmetrical arrangement by a small angle, for example 5. Either of these measures cause a resulting force ln the area of the agitator blades, which can compensate for the moment on the agitator shaft arising from the forces on the offset shaft connection
This invention relates to a one-piece agitator, pre-ferably enameled, for use in closed enameled vessels having manhole openings therein.
There are three general types of enameled vessels.
In one type, frequently referred to as a two piece or clamp top vessel~ the entire top head of the vessel can be remov-ed. This facilitates installation of internal components such as agitators and baffles. However, this type of construction increases construction costs and-magnifies -sealing problems, particularly since adj`ustments of the seals may be necessary because of distortions of the vessel flanges during enameling of the vessel.
~nother typa of vessel, sometimes referred to as a one piece vessel ~ith an assembly opening, uses a top head - formed integrally with the body of the vessel, but with a relatively large openin~ in the head through which agita-tors and the like can be installed. Thus, relatively large container openings are still necessary, with the attendant production costs and sealing problems.
The third type of vessel, frequently referred to as a one piece or closed vessel, features an integral top head with relatively small openings such as pipe connections, openings for agitator and/or baffle shafts~ and manhole openings. The largest opening in a vessel of this type is usually the manhole, which is ty~ically much too s~all to admit a conventional one piece agitator of the si2e that would be desirable for many applications. Yhus, .,:, .. .
although this type o~ reactor minimi~es the construction -- 1 -- .
l ~B9~9 costs and sealin~ problems preserltccl by tlle clamp top vessel and the one piece vessel with the large asse~bly opening, it limits the type of agitator that can be install-ed in the vessel.
Separable enameled agitators--with individual ele~ents ehat can be introduced tllrougll a relatively snall opening such as a manhole and assembled inside the vessel--avoid the foregoing problems. UnEortunately, since the seals on these separable agitators are rela~ively inaccessible 10 and difficult to e~amine, and since these agitators are frequently exposed to highly corrosive conditions, it is difficult and expensive to provide reliable seals for these separable enameled agitators. ~loreover, even in the case of very expensive sealing constructions, the 15 connection points on the agitators form weak points where brea~downs can occur.
Sumr~ary of the Invention:
It is an object of this invention to provide a one piece agitator that may be completely enameled and then 20 inserted through an opening in a closed vessel, such as a manhole, which is considerably smaller than the diameter of the agitator impeller and which provides agitation comparable to other enamelled agitators.
These objects are achieved by using an agitator with 25 an impeller that can be wound or threaded through the manhole opening. In a preferred embodiment, a plurality of agitator blades are mounted on a ring segmellt which in turn is connected directly to the agitator shaft, preferably through an offset portion at the lower cnd 30 of the sha~t. Since this impeller can be threaded through a relatively small opening, such as a manhole, it can have an outer or circumferential diameter several times larger than thc greatest cross-section dimension of the manhole, and still be inserted through a conventional rlanhole in 35 a closed vessel. ~urtl-er advantages of this onc piece . ~ ,,, agitator construction, whicll can be completely enamelecl, are that the impeller blades can be curvcd to form a retreat curve impeller and can bc posltioned near the bottoM of the ves~el, and that, particularly ~ith highly viscous products, an additional mixing affect is obtained through the offset formation of the agitator shaft.
Drawings:
Figure 1 is a schematic sectional elevation view of a vessel containing an embodiment of this invention, with the agitator shown in perspective.
. ` Figure 2 is a schematic plan view of the vessel and . 10 agitator shown in Fi~ure 1.
Fi~ures 3-6 are schematic elevation views of other embodiments of this invention.
Detailed Description:
Figures 1 and 2 illustrate a preferred embodiment of this invention, with a one piece, completely enameled agitator mounted inside a typical closed enameled vessel 11. A manhole 17 and ail agitator mounting noz~le 8 are-provided in the top head of the vessel 11. An agitator . shaft 1 extends through the agitator nozzle ~. The -.
lower portion 2 of the agitator shaft is offset, and the agitator impeller is attached to the lo-wer end of the o~fset shaft connection 2. The impeller comprises a ring ~ ` shaped segment 3 and three agitator blades 4, 5 and 6 ex-: . tending from the ring segment.3. The agitator blades and ~; 25 the ring shaped segment 3 may all lie in a plane perpen-dicular to the axis of the agitator shaft 1, as illustrated in Figure 1. However, the agitator blades 4, S and 6 may also be inclined slightly upwards to conform to the gener-ally conical shape of the bottom.of the vessel 11 if it is desirable to position the agitator as close to tl~e bottom as possible.
As may be seen from Figures 1 and 2, there is an opening in the ring segment 3 which allows the ring segment - to be threaded through the manhole 11. With the illustra- -. 35 ted three blade impeller, the cut out section may be approximately 120. The agi~ator blades may be symmetric-ally arranged on the ring segment 3 with respect to rota-.
~z~9z9 tion, however, it r~lay be desirablc to dlsplace some of the agitator blades s.lightly from a symmetrical arrangement to help balance moments on the agitator, as will be e~plained in greater detail belo~.
Of course, more than three agitator blades may also be used. Generally, the agitator blades will be provided in the number and form desired for various mixing processes.
A preferred form has three blades, flattened to increase the heighth o the blades, with the~tips curved a~7ay from 10 the direction of rotation of the impeller. This type of construction, frequently referred to as a retreat curve . impeller, helps to circulate the material being mixed throughout the vessel. I~ith three flattened retreat curve agitator blades mounted on a ring segment such as the 15 one illustrated in Figures 1 and ~, the nixing efectobtained is comparable to that obtained with a conventional retreat curve i~peller, The maximum length of.the agitator blade can be chosen equal to the greatest diameter of the manhole 17, less 20 the necessary space for insertion o approximately 30 to 50~m. In order to provide an optimal assembly, a portion of the agitator shaft fastened to the ring se~ment 3 may - .- first run or a certain distance parallel to the agitator axis, as illustrated in Figure 1. T~?is type of agitator 25 can be directly mounted through an ordinary.manhole open-- ing 17 of a one piece container. Thus, insertion and mounting of the agitator does not require any openings larger than the manhole opening that is usually present, An agitator drive mechanism (not shown) is generall~
30 attached to the agltator above the agitator mounting nozxle .8. Also, a conventional finger shaped, ~-shaped or paddle ~hapcd bafle 9 is typically used with the agitators of this invention. The baffle 9, which can also be inserted through the manhole opening 17, is mounted in a conventional 35 baffle mounting no~zle or opening 10.
Pecause of the special construction of the agitators ~ of this invention, ~oments are produccd at the point ~hcre ~1289~9 the agitator is supported in no~zle 8, arising both frol~
the Eorces of flow and also from centrifugal force~. These moments should be compensated for or balanced to insurc satisfactory functioning of the shaft sealing, and to avoia S the need to oversize the agitator shaft and/or drive unit to prevent overloading in case greater drive po~ers are required.
The flow forces on the offset portion 2 of the agita-tor shaft generate moments on the agitator in different planes perpendicular to the axis o rotation. The mo~ents on the,agitator shaft and/or the agitator mounts and seals arising therefrom can be compensated for by slightly varying the height of one or more of the agitator blades 4, S and 6 relative to the other blades or, as is shown in Figure 2, by mounting some of the agitator blades in a position that deviates from a symmetrical arrangement by a small angle, for example 5. Either of these measures cause a resulting force ln the area of the agitator blades, which can compensate for the moment on the agitator shaft arising from the forces on the offset shaft connection
2. The remaining uncompensated transverse forces do not affect the functioning of the agitator.
In a similar way, the imbalances arising from the lack of symmetry o the impeller can be compensated for by varying the thic~ness of one or more of the agitator blades 4> 5, 6 or the thickness of the ring shaped segment
In a similar way, the imbalances arising from the lack of symmetry o the impeller can be compensated for by varying the thic~ness of one or more of the agitator blades 4> 5, 6 or the thickness of the ring shaped segment
3. The weight of certain parts of the impeller may also be ~aried by other means, as for example, mounting addition-al masses on one or more agitator blades, so that no undesired moment influences the a~,itator shaft.
The moment arising at the point of connection between the ring shaped segment 3 and the shaft connection 2 may be controlled without special difficulties. A partial compensation for the moment at this location, which is produced by flow forces and centrifugal forces, is obtained by arranging the ring sllaped segment 3 so that it follows , j the shaft connection 2 in the direction of rotation 7.
-` 11289~9 .
~ith this arrangement, the resultants of the forces of flow and the centrifugal forces act in opposite directions, whicl~ reduces the moment at the p`oint where the ring segment joins the shaft connection 2.
An agitator of this sort can be completely enameled, because of its construction fsvorable to enameling techni-que, wlthout fear oi chipping, which could be caused through excessive stresses generated in the enameling process or in the operation of the agitator. This produces significant advantages in the economy of using a vessel according to this invention, because it is desirable, particularly in highly corrosive chemical applications `
at high te~peratùres under high pressures J to avoid the seals ~nd weak points which were characteristic disadvan-tages of ~nown segmented enamel agitators.
Figures 3-6 show other versions of this invention which may also be threaded through a conventional sized manhole 17 in a closed vessel 11. In each of these agitators, the impeller is constructed o alternating sections running at least approximately horizontally and , sections running at least approximately vertically. In the`
agitator represented in Fi&ure 3, the i~peller-is essen- -~` tially made S-shaped in that the agitator blades 14, 15, - 16 are arranged horizontally and superimposed abo~e one another, and are connected with each other by vertical connecting ar~s 12, 13 which are offset from the axis of the agitator shaft 1. The impeller of the agitator - -shown in Figure 4 could be considered as a partial S-shape or as a C-shape with an additional agitator blade attached essentially vertically at the lowex end o the impeller.
Further advantages of the agitator shown in Figures 3 and 4, in comparison with the agitator illustraeed in Figures 1 and 2, are the control of higller viscosities and non-Newtonian substances in mixing, as well as more ; 35 uniform shearing of products which are susceptible to shearing. The reason for this is the greater leading surface of the agitator and the surface distrlbution in the whole --` ~128929 apparatus.
Figures S and 6 illustrate additional exan~ples of impellers constructed of alternating vertical and at least approximately horizontal sections. In Figure S, one ` S vertical section is connected to an offset portion of the agitator shaft, and the first vertical section is in turn connected to a second vertically extending agitator blade by a connection which extends approximately horizon-tally. In Figure 6 the agitator shaft attaches directly to the approximately~horizontal connecting piece, and one vertically extending agitator blade is attached at each end of the connecting piece. These a~itators are easier to enamel and less espensive than the version shown in Figures 1 and 2.
Thus, it may be seen that this invention provides a variety of one piece agitators with impellers that may be threaded through relative small openings, such as man-J holes, in closed enameled vessels. All of these agitators can be completely covered with an enamel coatin~, which makes them less susceptible to corrosive attack than - separable blade agitators. Moreover, since there are no ~oints which can loosen, they are sturdier than separa-: .
Ble blade agitators. Those skilled in the art will appre-- ciate that a variety of other agitators of this sort can be constructed within the scope of this invention, which is defined by the following claims.
' ' "
.
The moment arising at the point of connection between the ring shaped segment 3 and the shaft connection 2 may be controlled without special difficulties. A partial compensation for the moment at this location, which is produced by flow forces and centrifugal forces, is obtained by arranging the ring sllaped segment 3 so that it follows , j the shaft connection 2 in the direction of rotation 7.
-` 11289~9 .
~ith this arrangement, the resultants of the forces of flow and the centrifugal forces act in opposite directions, whicl~ reduces the moment at the p`oint where the ring segment joins the shaft connection 2.
An agitator of this sort can be completely enameled, because of its construction fsvorable to enameling techni-que, wlthout fear oi chipping, which could be caused through excessive stresses generated in the enameling process or in the operation of the agitator. This produces significant advantages in the economy of using a vessel according to this invention, because it is desirable, particularly in highly corrosive chemical applications `
at high te~peratùres under high pressures J to avoid the seals ~nd weak points which were characteristic disadvan-tages of ~nown segmented enamel agitators.
Figures 3-6 show other versions of this invention which may also be threaded through a conventional sized manhole 17 in a closed vessel 11. In each of these agitators, the impeller is constructed o alternating sections running at least approximately horizontally and , sections running at least approximately vertically. In the`
agitator represented in Fi&ure 3, the i~peller-is essen- -~` tially made S-shaped in that the agitator blades 14, 15, - 16 are arranged horizontally and superimposed abo~e one another, and are connected with each other by vertical connecting ar~s 12, 13 which are offset from the axis of the agitator shaft 1. The impeller of the agitator - -shown in Figure 4 could be considered as a partial S-shape or as a C-shape with an additional agitator blade attached essentially vertically at the lowex end o the impeller.
Further advantages of the agitator shown in Figures 3 and 4, in comparison with the agitator illustraeed in Figures 1 and 2, are the control of higller viscosities and non-Newtonian substances in mixing, as well as more ; 35 uniform shearing of products which are susceptible to shearing. The reason for this is the greater leading surface of the agitator and the surface distrlbution in the whole --` ~128929 apparatus.
Figures S and 6 illustrate additional exan~ples of impellers constructed of alternating vertical and at least approximately horizontal sections. In Figure S, one ` S vertical section is connected to an offset portion of the agitator shaft, and the first vertical section is in turn connected to a second vertically extending agitator blade by a connection which extends approximately horizon-tally. In Figure 6 the agitator shaft attaches directly to the approximately~horizontal connecting piece, and one vertically extending agitator blade is attached at each end of the connecting piece. These a~itators are easier to enamel and less espensive than the version shown in Figures 1 and 2.
Thus, it may be seen that this invention provides a variety of one piece agitators with impellers that may be threaded through relative small openings, such as man-J holes, in closed enameled vessels. All of these agitators can be completely covered with an enamel coatin~, which makes them less susceptible to corrosive attack than - separable blade agitators. Moreover, since there are no ~oints which can loosen, they are sturdier than separa-: .
Ble blade agitators. Those skilled in the art will appre-- ciate that a variety of other agitators of this sort can be constructed within the scope of this invention, which is defined by the following claims.
' ' "
.
Claims (18)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a closed enameled vessel having a manhole opening, an agitator opening and an enameled agitator mounted in said agitator opening, said agitator comprising an agitator shaft and an impeller having a diameter larger than the largest opening in said vessel, the improvement wherein said agitator is a one piece construction, is completely enameled and is inserted into said vessel by threading the impeller through the manhole.
2. Apparatus according to claim l wherein the impeller comprises a segment of a ring and agitator blades attached to and extending outwardly from said segment.
3. In a closed vessel having a manhole opening therein, an agitator opening and an agitator mounted in said agitator opening, said agitator comprising an agitator shaft and an impeller having a diameter larger than the largest opening in said vessel, the improvement wherein said impeller comprises a segment of a ring and a plurality of agitator blades mounted on and extending outwardly from said ring segment.
4. Apparatus according to claim 3, wherein the lower end of said agitator shaft is offset and said ring segment is attached to the offset portion of said shaft.
5. Apparatus according to claim 4 wherein said ring segment follows the offset shaft portion in the direction of rotation of the agitator.
6. Apparatus according to claim 3 or 5 wherein said agitator is a one piece construction and is completely enameled.
7. Apparatus according to claim 3, 4 or 5 wherein said ring segment has a cutout section of approximately 120°.
8. Apparatus according to claims 3, 4 or 5 wherein one of said agitator blades is mounted at each end of said ring segment.
9. Apparatus according to claim 3, wherein said impeller comprises at least three agitator blades and said blades are mounted at least approximately symmet-rically with respect to rotation.
10. Apparatus according to claim 9 wherein at least one agitator blade is mounted in a position which is displaced at a small angle from a position symmetrical with respect to rotation to the position of a neighboring agitator blade.
11. Apparatus according to claim 10 wherein said small angle is approximately 5°.
12. Apparatus according to claim 3, 4 or 5 wherein the weight of at least one of said agitator blades is different from the weight of at least one other agitator blade to compensate for imbalance.
13. Apparatus according to claim 3, wherein said agitator blades are flattened to increase their height.
14. Apparatus according to claim 13 wherein the height of at least one of said agitator blades is different from the height of at least one other agitator blade.
15. Apparatus according to claim 1 wherein said impeller comprises alternating sections extending at least approximately horizontally and vertically.
16. Apparatus according to claim 1 wherein said impeller is C-shaped.
17. Apparatus according to claim 1 wherein said impeller is S-shaped.
18. Apparatus according to claim 16 or 17 wherein an additional vertically extending agitator blade is attached to said impeller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2751770.0 | 1977-11-19 | ||
| DE19772751770 DE2751770A1 (en) | 1977-11-19 | 1977-11-19 | ONE-PIECE ENAMELLED AGITATOR CONTAINER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1128929A true CA1128929A (en) | 1982-08-03 |
Family
ID=6024131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA315,027A Expired CA1128929A (en) | 1977-11-19 | 1978-10-31 | One-piece agitator for closed vessel |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5499211A (en) |
| CA (1) | CA1128929A (en) |
| DE (1) | DE2751770A1 (en) |
| FR (1) | FR2409082A1 (en) |
| IT (1) | IT1106401B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2509295Y2 (en) * | 1991-11-27 | 1996-08-28 | 岡崎鑛産物株式会社 | Agitator that doubles as a transport container |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE969561C (en) * | 1953-05-17 | 1958-06-19 | Basf Ag | Process for carrying out chemical reactions |
| GB794185A (en) * | 1954-05-03 | 1958-04-30 | Harold Davies Jones | Improved liquid agitator or impeller arrangements |
| GB1091966A (en) * | 1965-04-14 | 1967-11-22 | Thale Eisen Huettenwerk | Improved stirring device |
| US3894723A (en) * | 1972-07-10 | 1975-07-15 | Murray A Sanders | Removable agitator |
| JPS523814B2 (en) * | 1974-03-08 | 1977-01-31 |
-
1977
- 1977-11-19 DE DE19772751770 patent/DE2751770A1/en not_active Withdrawn
-
1978
- 1978-10-31 CA CA315,027A patent/CA1128929A/en not_active Expired
- 1978-11-09 FR FR7831704A patent/FR2409082A1/en not_active Withdrawn
- 1978-11-17 JP JP14275878A patent/JPS5499211A/en active Pending
- 1978-11-17 IT IT51952/78A patent/IT1106401B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT7851952A0 (en) | 1978-11-17 |
| FR2409082A1 (en) | 1979-06-15 |
| JPS5499211A (en) | 1979-08-04 |
| DE2751770A1 (en) | 1979-05-23 |
| IT1106401B (en) | 1985-11-11 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |