CA1286635C - Hydrocyclones, particularly pulp cleaner cones of the canister operated type - Google Patents
Hydrocyclones, particularly pulp cleaner cones of the canister operated typeInfo
- Publication number
- CA1286635C CA1286635C CA000488088A CA488088A CA1286635C CA 1286635 C CA1286635 C CA 1286635C CA 000488088 A CA000488088 A CA 000488088A CA 488088 A CA488088 A CA 488088A CA 1286635 C CA1286635 C CA 1286635C
- Authority
- CA
- Canada
- Prior art keywords
- canister
- main body
- hydrocyclone
- operated type
- closure member
- 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
- 238000000605 extraction Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 239000004814 polyurethane Substances 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 229920002635 polyurethane Polymers 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 239000000853 adhesive Substances 0.000 claims abstract description 4
- 230000001070 adhesive effect Effects 0.000 claims abstract description 4
- 238000003780 insertion Methods 0.000 claims description 10
- 230000037431 insertion Effects 0.000 claims description 10
- 230000033001 locomotion Effects 0.000 claims description 9
- 230000013011 mating Effects 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 2
- 239000000725 suspension Substances 0.000 abstract description 7
- 238000007689 inspection Methods 0.000 abstract description 4
- 239000002002 slurry Substances 0.000 abstract description 2
- 230000000875 corresponding effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 239000000727 fraction Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/24—Multiple arrangement thereof
- B04C5/28—Multiple arrangement thereof for parallel flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/08—Vortex chamber constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
- B04C5/13—Construction of the overflow ducting, e.g. diffusing or spiral exits formed as a vortex finder and extending into the vortex chamber; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow
Landscapes
- Paper (AREA)
Abstract
HYDROCYCLONES, PARTICULARLY PULP CLEANER
CONES OF THE CANISTER OPERATED TYPE
Abstract of the Disclosure A hydrocyclone, particularly a pulp cleaner cone, of the canister operated type is formed of a slightly yieldable or flexible material such as polyurethane molded as two main parts, a main cone body having a generally conical vortex space or separation chamber into which a suspension or slurry feed port and a rejects or underflow outlet port open, and a closure member or vortex finder body containing an accepts or overflow outlet for the finer fraction separated from the suspension. The vortex finder body is mounted in the base end of the hollow vortex space, and has a pro-jecting portion formed with a grip area for gripping by an extraction tool to remove the cone from the canister for inspection, unplugging, etc. An improved connec-tion between the main cone body and the vortex finder body, to cope with the substantial pull forces of the extraction tool, comprises axially spaced wedge-shaped projections or ramps extending in ring-like form about the vortex finder body and interfitted with corre-sponding wedge-shaped grooves in the interior wall of the main body. Assembly is by forcibly inserting the vortex finder until the wedge projections and grooves interfit to hold the vortex finder body firmly in the main body. An adhesive may be used for additional holding power and sealing. By using a polished molding tool, the interior surface of the vortex space or separation chamber is made extremely smooth.
CONES OF THE CANISTER OPERATED TYPE
Abstract of the Disclosure A hydrocyclone, particularly a pulp cleaner cone, of the canister operated type is formed of a slightly yieldable or flexible material such as polyurethane molded as two main parts, a main cone body having a generally conical vortex space or separation chamber into which a suspension or slurry feed port and a rejects or underflow outlet port open, and a closure member or vortex finder body containing an accepts or overflow outlet for the finer fraction separated from the suspension. The vortex finder body is mounted in the base end of the hollow vortex space, and has a pro-jecting portion formed with a grip area for gripping by an extraction tool to remove the cone from the canister for inspection, unplugging, etc. An improved connec-tion between the main cone body and the vortex finder body, to cope with the substantial pull forces of the extraction tool, comprises axially spaced wedge-shaped projections or ramps extending in ring-like form about the vortex finder body and interfitted with corre-sponding wedge-shaped grooves in the interior wall of the main body. Assembly is by forcibly inserting the vortex finder until the wedge projections and grooves interfit to hold the vortex finder body firmly in the main body. An adhesive may be used for additional holding power and sealing. By using a polished molding tool, the interior surface of the vortex space or separation chamber is made extremely smooth.
Description
lZ~ 35 HYDROCYCLONES, PARTICULARLY PULP CLEANER
CONES OF THE CANISTER OPERATED TYPE
This inventlon relates to hydrocyclones of the canister-operated type, particularly pulp cleaner cones used for separating or fractionating fibrous suspen-sions, notably suspensions of cellulose or wood pulp.
Canister-operated pulp cleaner cones are well-known in the art. In such arrangements, a series of hydro-cyclones or pulp cleaner cones are mounted individually in a canister structure which provides common inlets and common outlets for the individual cleaner cones, the cones being sealably mounted through openings in walls of the canister structure. Examples are shown in U. S. Patent 4,426,283 (Fecske) issued January 17, 15 1984, U. S. Patent 2,765,918 (Fontein) issued October 9, 1956, and U. S. Patent 3,261,467 (Wikdahl) issued July 19, 1966. These patents show various forms of hydrocyclones and various canister structures which might be considered exemplary of the art.
Canister-operated cleaner cones require periodic inspection, and also require unplugging at times. In some typical commercial structures of which I am aware, frequent failures of the cleaner cones occur in the unplugging operation during cone maintenance. Thus, each cone must be pulled from the canister, inspected and/or unplugged, and then reinserted. The pull forces imposed on the cleaner cones by the extraction tool become critical as the cone material ages and its phy-sical properties begin to yield under the pull stresses of the extraction tool. In certain conventional .
128~635 cleaner cones which are commercially available and com-mon in the industry, the cleaner cones use a pin arrangement for holding the vortex finder body to the main body, and failures predominantly occur at the pinned locations during attempted removal of the cones by the extraction tool. In such known arrangements, the vortex finder body and the main body are formed with mating holes to receive retaining pins, the retaining pins being inserted through the mating holes after the vortex finder body is inserted into the main body. When the extraction tool grips the extraction tool grip location on the vortex finder body and exerts force to remove the cleaner cone from the canister, there have been failures along the plane of the retaining pin bores. In spite of these problems, such structures have been and are in substantial use commer-cially.
It is also known in the art for some cleaner cones to have the vortex finder body and the main body screw threaded together, such as is shown in the previously mentioned U. S. Patent 4,426,283, and also in Seifert et al U. S. Patent 4,155,839 issued May 22, 1979. Such threaded arrangements have their own problems. Thus, depending on the material from which the vortex finder body and main body are made, screw threads may be dif-ficult to form accurately, and screw thread connections may be difficult to make. Additionally, considering the fairly severP conditions under which these pulp cleaner cones operate, screw connections can work loose unless special precautions are taken. In pulp cleaner ~286635 cones of a somewhat flexible material, the holding power of conventional screw threads could be suspect and sometimes unreliable, particularly when considering the substantial pulling forces exerted on the vortex finder body by the extractor tool during removal for inspection, unplugging, etc.
Against this background, it is a purpose of the present invention to provide improved pulp cleaner cones of the canister-operated type, principally by providing an improved, strong and easily made connec-tion between the vortex finder body or closure member and the main body of the pulp cleaner cone, which avoids the disadvantages of known connection construc-tions, and which will readily withstand pull forces imposed by the extraction tool, which become partic-ularly critical as the cone material ages and its phys-ical properties begin to yield under the pull stresses of the extraction tool. It is a subsidiary purpose of the invention to provide an improved pulp cleaner cone in which the vortex chamber or separation chamber has an extremely smooth surface, which purpose is accom-plished by molding the main body of the pulp cleaner cone from polyurethane or a similar material and forming the interior surface of the separation chamber by a mold part having a highly polished surface.
For completeness of disclosure of the known prior art, reference is also made to U. S. Patent 4,189,377 (Dahlberg) issued February 19, 1980, and U. S. Patent 4,260,480 (Lewis) issued April 7, 1981, these patents disclosing multiple cyclone separators in which cyclone ~28~S
units are integrally formed in radial relationship in premolded disks or the like. While these structures could be considered as canister-operated hydrocyclones, the individual hydrocyclones are not removable as such, and hence one of the main problems to which the present invention is directed is not a material consideration in the constructions of these patents. The patents are exemplary of other types of connection between the vor-tex finder bodies and the main bodies of the hydro-cyclones, which connections differ substantially fromthose of the present invention.
Other features, purposes, objects and advantages of the invention may be derived from the ensuing descrip-tion and illustrations of exemplary constructions in accordance with the prior art and the present inven-tion.
Figures 1, 2 and 3 illustrate diagrammatically a known construction utilizing retaining pins to connect the vortex finder body to the main body, and showing, respectively, the device in unassembled form, in assembled form, and in exemplary failed form.
Figure 4 is a general perspective view of a pulp cleaner cone embodying the invention.
Figure 5 is an axial section of the vortex finder body and the upper or base end of the main body of the pulp cleaner cone shown in Figure 4.
Referring to the drawings, Figures 1-3 illustrate a known form of pulp cleaner cone shown, respectively, in its unassembled form, its assembled form, and its failed form after extraction or attempted extraction by 12~3~6~S
a known extractor tool from its seated position in a known form of canister. The cleaner cone comprises a main cone body 1 which typically is of conical exterior configuration and is formed with a generally conical interior which defines a vortex space or separation chamber. The conical separation chamber is surmounted at its large base end by a generally cylindrical hollow portion for insertably receiving a corresponding generally cylindrical portion ll of a vortex finder body 2, also frequently referred to as a lid or closure member. The main cone body l, which can be of polyurethane or some similar tough but slightly resil-ient material, is formed with sealing rings 3 or the like at locations along its length so as to sealingly seat in seat openings in spaced walls of a conventional canister. The base end of main cone body 1 includes a flange 12. The vortex finder body fits partially down into a corresponding generally cylindrical section at the base end of the main cone body 1, such that generally cylindrical section 11 of the vortex finder body is a close fit within the generally cylindrical interior section of the main cone body 1. The vortex finder body and the main cone body are provided with mating retaining pin holes or bores 4 and 5 such that the assembled components are held together by retaining pins which pass through the bores or holes 4 and 5.
The assembled device is shown in Figure 2. Main cone body l is formed with a generally tangentially oriented feed port 7 for receiving a pressurized fluid suspen-sion, slurry, etc. A conventional rejects outlet 8, ~213f~635 also known as an underflow outlet, is located at theapex of the cone. The vortex finder body 2 is formed with an outlet tube 9, for the relatively finer frac-tion of the suspension, the outlet being commonly termed an accepts outlet or overflow pipe. From the accepts outlet 9 the relatively finer fraction of the suspension passes into the hollow interior of vortex finder main body 2 and then out of the upper end of the vortex finder main body as viewed in Figure 1. The vortex finder main body includes a flange 10 such that in the assembled state shown in Figure 2 the portion of cylindrical part 11 of the vortex finder main body between flanges 10 and 12 forms an extraction tool grip location, which is gripped by a conventional extraction tool for removal of the pulp cleaner cone assembly from the conventional canister. This is necessary for periodic inspection and unplugging of the cones as required. The pull force necessary to remove the cones from the canister can be substantial, and as the cone material ages and its physical properties begin to yield under the pull stresses of the extraction tool, the pull forces imposed on the cones by the extraction tool become critical. The result can be and often is a failure as illustrated diagrammatically in Figure 3 where a plane of failure is shown as passing through the retaining pin bores in the upper part of the main cone body. The failure typically begins at the retaining pin hole stress points and propagates through the upper sealing rings of the main cone body. This results in down time and necessary cone replacement.
lZ~366~35 Figure 2 generally illustrates a pulp cleaner cone in accordance with the present invention, which is of substantially the same construction as the prior art cleaner cone of Figures 1-3, except that there are no retaining pins or retaining pin holes. Accordingly, corresponding parts are designated by the same reference characters. The external configuration of the cleaner cone of Figure 4 is slightly different from the diagrammatically illustrated exterior configuration of Figures 1-3, but these are not considered to be material differences. A detailed axial section of the cleaner cone assembly of Figure 4 is shown in Figure 5, which illustrates the novel features of the present invention.
Referring to Figures 4 and 5, the vortex finder body is surmounted by an extended portion 13 which can abut against a canister wall to prevent pop-out of the cone assembly during pressurized operation. Bxtended part 13 is cut away at 14 so as to provide a clear flow path for the finer fraction which exits the cone via the accepts outlet 9. The extraction tool grip loca-tion of the assembly is shown at 11 in Figures 4 and 5, between flange areas 10 and 12. The interior surface 17 of the vortex space or separation chamber in accor-dance with the invention is made as smooth as possibleby utilizing a highly polished mold surface during the molding process. Preferably this very smooth state applies to all surfaces within the vortex space or separation chamber, including those surfaces of the vortex finder body which define part of the separation 1~8~63S
chamber, as shown in Figure 5.
In accordance with the invention, the hollow interior of the upper part of the main cone body as viewed in Figure 5 is substantially cylindrical, so as to matingly receive with a close fit a corresponding generally cylindrical part of the vortex finder body.
In the illustrated embodiment, this generally cylindri-cal part of the vortex finder body is formed with wedge-shaped projections extending in ring-like fashion about the circumference, and engaged in correspondingly formed mating wedge-shaped grooves about the interior periphery of the main cone body 1. The wedge-shaped projections have inclined leading surfaces 15 facing in the direction of relative insertion movement of the vortex finder body into the main cone body, and abruptly inwardly extending trailing surfaces 16, so as to permit insertion movement while precluding separa-tion movement. The illustrated embodiment includes two such wedge-shaped peripheral projections axially spaced from each other, but this is merely exemplary. The axially spaced peripheral grooves are correspondingly formed. While the trailing surfaces 16 in the illustrated embodiment are substantially perpendicular to the longitudinal axis of the main body and closure member, increased security and holding power can be effected by inclining these trailing surfaces 16 slightly in the direction of insertion movement as they extend inwardly, so as to provide a barb effect.
Assembly of the main cone body and vortex finder body is by shoving the two together until the wedge-shaped 12~;35 projections seat in the wedge-shaped grooves, one or both of the vortex finder body and main cone body being of a material of sufficient yieldability to permit this insertion assembly, such as polyurethane or various natural or synthetic rubber-like materials. Preferably the wedge-shaped projections are formed during the molding process, while the wedge-shaped grooves are cut into the interior surface after molding. Of course, it will be understood that the arrangement could be reversed, with reversely oriented wedge-shaped projec-tions on the interior wall of the main cone body, and corresponding wedge-shaped grooves on the exterior of the generally cylindrical mating part of the vortex finder body.
For increased security, holding power and sealing, an adhesive may be applied to the surface of one member or the other prior to insertion assembly. Various polyurethane adhesives may be used, and for high tem-perature operation an epoxy adhesive may be preferred.
It will, of course, be understood that the projec-tions and grooves have no pitch in the sense of screw threads, and that they are located inwardly of the axial ends of the mating surfaces. As such, they are not subject to accidental unscrewing by vibrations and the like during operation.
Various changes may be made in the illustrated embodiment within the scope of the invention, and it is to be understood that the illustrated and described embodiments are merely exemplary of the presently pre-ferred embodiments of the invention.
CONES OF THE CANISTER OPERATED TYPE
This inventlon relates to hydrocyclones of the canister-operated type, particularly pulp cleaner cones used for separating or fractionating fibrous suspen-sions, notably suspensions of cellulose or wood pulp.
Canister-operated pulp cleaner cones are well-known in the art. In such arrangements, a series of hydro-cyclones or pulp cleaner cones are mounted individually in a canister structure which provides common inlets and common outlets for the individual cleaner cones, the cones being sealably mounted through openings in walls of the canister structure. Examples are shown in U. S. Patent 4,426,283 (Fecske) issued January 17, 15 1984, U. S. Patent 2,765,918 (Fontein) issued October 9, 1956, and U. S. Patent 3,261,467 (Wikdahl) issued July 19, 1966. These patents show various forms of hydrocyclones and various canister structures which might be considered exemplary of the art.
Canister-operated cleaner cones require periodic inspection, and also require unplugging at times. In some typical commercial structures of which I am aware, frequent failures of the cleaner cones occur in the unplugging operation during cone maintenance. Thus, each cone must be pulled from the canister, inspected and/or unplugged, and then reinserted. The pull forces imposed on the cleaner cones by the extraction tool become critical as the cone material ages and its phy-sical properties begin to yield under the pull stresses of the extraction tool. In certain conventional .
128~635 cleaner cones which are commercially available and com-mon in the industry, the cleaner cones use a pin arrangement for holding the vortex finder body to the main body, and failures predominantly occur at the pinned locations during attempted removal of the cones by the extraction tool. In such known arrangements, the vortex finder body and the main body are formed with mating holes to receive retaining pins, the retaining pins being inserted through the mating holes after the vortex finder body is inserted into the main body. When the extraction tool grips the extraction tool grip location on the vortex finder body and exerts force to remove the cleaner cone from the canister, there have been failures along the plane of the retaining pin bores. In spite of these problems, such structures have been and are in substantial use commer-cially.
It is also known in the art for some cleaner cones to have the vortex finder body and the main body screw threaded together, such as is shown in the previously mentioned U. S. Patent 4,426,283, and also in Seifert et al U. S. Patent 4,155,839 issued May 22, 1979. Such threaded arrangements have their own problems. Thus, depending on the material from which the vortex finder body and main body are made, screw threads may be dif-ficult to form accurately, and screw thread connections may be difficult to make. Additionally, considering the fairly severP conditions under which these pulp cleaner cones operate, screw connections can work loose unless special precautions are taken. In pulp cleaner ~286635 cones of a somewhat flexible material, the holding power of conventional screw threads could be suspect and sometimes unreliable, particularly when considering the substantial pulling forces exerted on the vortex finder body by the extractor tool during removal for inspection, unplugging, etc.
Against this background, it is a purpose of the present invention to provide improved pulp cleaner cones of the canister-operated type, principally by providing an improved, strong and easily made connec-tion between the vortex finder body or closure member and the main body of the pulp cleaner cone, which avoids the disadvantages of known connection construc-tions, and which will readily withstand pull forces imposed by the extraction tool, which become partic-ularly critical as the cone material ages and its phys-ical properties begin to yield under the pull stresses of the extraction tool. It is a subsidiary purpose of the invention to provide an improved pulp cleaner cone in which the vortex chamber or separation chamber has an extremely smooth surface, which purpose is accom-plished by molding the main body of the pulp cleaner cone from polyurethane or a similar material and forming the interior surface of the separation chamber by a mold part having a highly polished surface.
For completeness of disclosure of the known prior art, reference is also made to U. S. Patent 4,189,377 (Dahlberg) issued February 19, 1980, and U. S. Patent 4,260,480 (Lewis) issued April 7, 1981, these patents disclosing multiple cyclone separators in which cyclone ~28~S
units are integrally formed in radial relationship in premolded disks or the like. While these structures could be considered as canister-operated hydrocyclones, the individual hydrocyclones are not removable as such, and hence one of the main problems to which the present invention is directed is not a material consideration in the constructions of these patents. The patents are exemplary of other types of connection between the vor-tex finder bodies and the main bodies of the hydro-cyclones, which connections differ substantially fromthose of the present invention.
Other features, purposes, objects and advantages of the invention may be derived from the ensuing descrip-tion and illustrations of exemplary constructions in accordance with the prior art and the present inven-tion.
Figures 1, 2 and 3 illustrate diagrammatically a known construction utilizing retaining pins to connect the vortex finder body to the main body, and showing, respectively, the device in unassembled form, in assembled form, and in exemplary failed form.
Figure 4 is a general perspective view of a pulp cleaner cone embodying the invention.
Figure 5 is an axial section of the vortex finder body and the upper or base end of the main body of the pulp cleaner cone shown in Figure 4.
Referring to the drawings, Figures 1-3 illustrate a known form of pulp cleaner cone shown, respectively, in its unassembled form, its assembled form, and its failed form after extraction or attempted extraction by 12~3~6~S
a known extractor tool from its seated position in a known form of canister. The cleaner cone comprises a main cone body 1 which typically is of conical exterior configuration and is formed with a generally conical interior which defines a vortex space or separation chamber. The conical separation chamber is surmounted at its large base end by a generally cylindrical hollow portion for insertably receiving a corresponding generally cylindrical portion ll of a vortex finder body 2, also frequently referred to as a lid or closure member. The main cone body l, which can be of polyurethane or some similar tough but slightly resil-ient material, is formed with sealing rings 3 or the like at locations along its length so as to sealingly seat in seat openings in spaced walls of a conventional canister. The base end of main cone body 1 includes a flange 12. The vortex finder body fits partially down into a corresponding generally cylindrical section at the base end of the main cone body 1, such that generally cylindrical section 11 of the vortex finder body is a close fit within the generally cylindrical interior section of the main cone body 1. The vortex finder body and the main cone body are provided with mating retaining pin holes or bores 4 and 5 such that the assembled components are held together by retaining pins which pass through the bores or holes 4 and 5.
The assembled device is shown in Figure 2. Main cone body l is formed with a generally tangentially oriented feed port 7 for receiving a pressurized fluid suspen-sion, slurry, etc. A conventional rejects outlet 8, ~213f~635 also known as an underflow outlet, is located at theapex of the cone. The vortex finder body 2 is formed with an outlet tube 9, for the relatively finer frac-tion of the suspension, the outlet being commonly termed an accepts outlet or overflow pipe. From the accepts outlet 9 the relatively finer fraction of the suspension passes into the hollow interior of vortex finder main body 2 and then out of the upper end of the vortex finder main body as viewed in Figure 1. The vortex finder main body includes a flange 10 such that in the assembled state shown in Figure 2 the portion of cylindrical part 11 of the vortex finder main body between flanges 10 and 12 forms an extraction tool grip location, which is gripped by a conventional extraction tool for removal of the pulp cleaner cone assembly from the conventional canister. This is necessary for periodic inspection and unplugging of the cones as required. The pull force necessary to remove the cones from the canister can be substantial, and as the cone material ages and its physical properties begin to yield under the pull stresses of the extraction tool, the pull forces imposed on the cones by the extraction tool become critical. The result can be and often is a failure as illustrated diagrammatically in Figure 3 where a plane of failure is shown as passing through the retaining pin bores in the upper part of the main cone body. The failure typically begins at the retaining pin hole stress points and propagates through the upper sealing rings of the main cone body. This results in down time and necessary cone replacement.
lZ~366~35 Figure 2 generally illustrates a pulp cleaner cone in accordance with the present invention, which is of substantially the same construction as the prior art cleaner cone of Figures 1-3, except that there are no retaining pins or retaining pin holes. Accordingly, corresponding parts are designated by the same reference characters. The external configuration of the cleaner cone of Figure 4 is slightly different from the diagrammatically illustrated exterior configuration of Figures 1-3, but these are not considered to be material differences. A detailed axial section of the cleaner cone assembly of Figure 4 is shown in Figure 5, which illustrates the novel features of the present invention.
Referring to Figures 4 and 5, the vortex finder body is surmounted by an extended portion 13 which can abut against a canister wall to prevent pop-out of the cone assembly during pressurized operation. Bxtended part 13 is cut away at 14 so as to provide a clear flow path for the finer fraction which exits the cone via the accepts outlet 9. The extraction tool grip loca-tion of the assembly is shown at 11 in Figures 4 and 5, between flange areas 10 and 12. The interior surface 17 of the vortex space or separation chamber in accor-dance with the invention is made as smooth as possibleby utilizing a highly polished mold surface during the molding process. Preferably this very smooth state applies to all surfaces within the vortex space or separation chamber, including those surfaces of the vortex finder body which define part of the separation 1~8~63S
chamber, as shown in Figure 5.
In accordance with the invention, the hollow interior of the upper part of the main cone body as viewed in Figure 5 is substantially cylindrical, so as to matingly receive with a close fit a corresponding generally cylindrical part of the vortex finder body.
In the illustrated embodiment, this generally cylindri-cal part of the vortex finder body is formed with wedge-shaped projections extending in ring-like fashion about the circumference, and engaged in correspondingly formed mating wedge-shaped grooves about the interior periphery of the main cone body 1. The wedge-shaped projections have inclined leading surfaces 15 facing in the direction of relative insertion movement of the vortex finder body into the main cone body, and abruptly inwardly extending trailing surfaces 16, so as to permit insertion movement while precluding separa-tion movement. The illustrated embodiment includes two such wedge-shaped peripheral projections axially spaced from each other, but this is merely exemplary. The axially spaced peripheral grooves are correspondingly formed. While the trailing surfaces 16 in the illustrated embodiment are substantially perpendicular to the longitudinal axis of the main body and closure member, increased security and holding power can be effected by inclining these trailing surfaces 16 slightly in the direction of insertion movement as they extend inwardly, so as to provide a barb effect.
Assembly of the main cone body and vortex finder body is by shoving the two together until the wedge-shaped 12~;35 projections seat in the wedge-shaped grooves, one or both of the vortex finder body and main cone body being of a material of sufficient yieldability to permit this insertion assembly, such as polyurethane or various natural or synthetic rubber-like materials. Preferably the wedge-shaped projections are formed during the molding process, while the wedge-shaped grooves are cut into the interior surface after molding. Of course, it will be understood that the arrangement could be reversed, with reversely oriented wedge-shaped projec-tions on the interior wall of the main cone body, and corresponding wedge-shaped grooves on the exterior of the generally cylindrical mating part of the vortex finder body.
For increased security, holding power and sealing, an adhesive may be applied to the surface of one member or the other prior to insertion assembly. Various polyurethane adhesives may be used, and for high tem-perature operation an epoxy adhesive may be preferred.
It will, of course, be understood that the projec-tions and grooves have no pitch in the sense of screw threads, and that they are located inwardly of the axial ends of the mating surfaces. As such, they are not subject to accidental unscrewing by vibrations and the like during operation.
Various changes may be made in the illustrated embodiment within the scope of the invention, and it is to be understood that the illustrated and described embodiments are merely exemplary of the presently pre-ferred embodiments of the invention.
Claims (12)
1. A hydrocyclone of the canister-operated type, comprising a main body having a hollow interior at least part of which is of generally conical con-figuration to define a separation chamber between the base and the apex, a generally tangential feed port into the hollow interior for feeding pressurized fluid so as to create a vortex in the separation chamber, a first outlet from the separation chamber located rela-tively toward the apex, said main body being open at the base end, a separately formed closure member inser-tably fitted into said open end of the main body and projecting therefrom, means defining an axial outlet in said closure member, said projecting part of said clo-sure member being formed with an extraction tool gripping area to permit pulling the hydrocyclone from canister openings in which said main body may be sealingly mounted, the outer and inner surfaces of said closure member and said main body, respectively, engaging with a close fit over the area of insertion, one of said surfaces being formed with at least one wedge-shaped projection extending peripherally therearound in ring-like fashion and engaged in a correspondingly formed mating groove in the other sur-face, the wedge-shaped projection having an inclined leading surface facing in the direction of relative insertion movement of the member on which it is formed and an abruptly inwardly extending trailing surface so as to permit insertion movement while precluding separation movement, at least one of the main body and the closure member being formed of a tough material of sufficient flexibility to yield sufficiently to permit said insertion movement and interengagement of said projection and groove.
2. A hydrocyclone of the canister-operated type as claimed in Claim 1 wherein said material is polyure-thane.
3. A hydrocyclone of the canister-operated type as claimed in Claim 1 wherein a plurality of separate axially spaced wedge-shaped projections are formed on said closure member, and corresponding mating grooves are formed in the inner surface of said main body.
4. A hydrocyclone of the canister-operated type as claimed in Claim 1 wherein said closure member and said main body are formed of the same material.
5. A hydrocyclone of the canister-operated type as claimed in Claim 1 wherein said trailing surface is substantially perpendicular to the longitudinal axis of the main body and closure member.
6. A hydrocyclone of the canister-operated type as claimed in Claim 1 wherein said trailing surface is inclined slightly in the direction of insertion move-ment as it extends inwardly.
7. A hydrocyclone of the canister-operated type as claimed in Claim 1 further including an adhesive adhering together the engaging surfaces of said closure member and said main body.
8. A hydrocyclone of the canister-operated type as claimed in Claim 1 wherein the inner and outer surfaces of said main body and closure member, respectively, are substantially cylindrical over their engaging areas.
9. A hydrocyclone of the canister-operated type as claimed in Claim 1 further comprising ring-form sealing means at spaced locations along the outer surface of said main body for sealing engagement with openings in a canister in which the main body may be mounted.
10. A hydrocyclone of the canister-operated type as claimed in Claim 1 wherein said main body and said clo-sure member are of polyurethane.
11. A hydrocyclone of the canister-operated type as claimed in Claim 10 wherein said main body is a molding with extremely smooth interior surfaces made by using a polished mold member for forming the interior surfaces.
12. A hydrocyclone of the canister-operated type as claimed in Claim 1 wherein said projection and groove are disposed axially inwardly of the area of engagement of the surfaces of said main body and closure member and are devoid of helical pitch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000488088A CA1286635C (en) | 1985-08-02 | 1985-08-02 | Hydrocyclones, particularly pulp cleaner cones of the canister operated type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000488088A CA1286635C (en) | 1985-08-02 | 1985-08-02 | Hydrocyclones, particularly pulp cleaner cones of the canister operated type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1286635C true CA1286635C (en) | 1991-07-23 |
Family
ID=4131116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000488088A Expired - Fee Related CA1286635C (en) | 1985-08-02 | 1985-08-02 | Hydrocyclones, particularly pulp cleaner cones of the canister operated type |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1286635C (en) |
-
1985
- 1985-08-02 CA CA000488088A patent/CA1286635C/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |