CA1128368A - Method and apparatus for pumping fibre suspensions - Google Patents
Method and apparatus for pumping fibre suspensionsInfo
- Publication number
- CA1128368A CA1128368A CA303,324A CA303324A CA1128368A CA 1128368 A CA1128368 A CA 1128368A CA 303324 A CA303324 A CA 303324A CA 1128368 A CA1128368 A CA 1128368A
- Authority
- CA
- Canada
- Prior art keywords
- rotor
- segment portion
- forming
- inside wall
- rotation
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
- F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/10—Kind or type
- F05B2210/13—Kind or type mixed, e.g. two-phase fluid
- F05B2210/132—Pumps with means for separating and evacuating the gaseous phase
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Paper (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The disclosure describes a method and a device for pumping fibre suspensions of high consistency. Shear forces disrupting fibre flocs are induced near the front edge of the vanes of the impeller in a centrifugal pump which fluidize the fibre suspension thereby converting it into an easily pumpable state. This is effected by an inlet port having recesses and/or lobes in its inner surface in front of the impeller and/or at the front edge of the impeller vanes, which cooperate with the impeller vanes and/or a rotor having an outer surface in which there are recesses and/or lobes disposed into the inlet port.
The disclosure describes a method and a device for pumping fibre suspensions of high consistency. Shear forces disrupting fibre flocs are induced near the front edge of the vanes of the impeller in a centrifugal pump which fluidize the fibre suspension thereby converting it into an easily pumpable state. This is effected by an inlet port having recesses and/or lobes in its inner surface in front of the impeller and/or at the front edge of the impeller vanes, which cooperate with the impeller vanes and/or a rotor having an outer surface in which there are recesses and/or lobes disposed into the inlet port.
Description
3~
METHOD AND APPAR~TUS FOR PUMPI~lG FIBRE SUSPENSIONS
The present invention relates in general to a method and an apparatus for pumping fibre suspensions and is particularly purposed to be applied in centrifugal pumps for fibre suspensions of high consistency.
Centrifugal pumps can successfully be used in the paper and cellulose industry for pumping fibre suspensions or pulps having consistencies less than 6% on condition that the pump has been correctly designed and that its input pressure is adequately high. A centrifugal pump is not, however, suitable for high consistency pulps as, owing to flocculation of the pulp, the pump tends to become clogged. Expensive pumps based on the displacement principle must therefore be used for pumping high-consistency pulps.
It is an object of the invention to provide a method and an apparatus which makes it possible to use centrifugal pumps for pumping pulps of considerably higher consistencies than until now.
According to the invention this is achieved by generating shear forces upstream of the impeller thus disrupting fibre agglomerations or flocs formed in the fibre suspension. The invention is based on the fact that the fibre suspension, when subjected to forces disrupting fibre-to-fibre bondings, becomes fluidized, i.e. is converted into an easily pumpable s~ate.
Compared with a conventional centrifugal pump, a pump according to the invention operates at a lower inlet pressure.
An apparatus according to the invention can eOg. be used for discharging pulps of consistencies from 5 to 25% from pulp vessels. According to known methods, pulp is discharged from a vessel by mechanical devices such as transport screws or rotating scrapers. Discharge of high-consist~ncy pulps requires much energy and robust constructions. Vibrating devices e.g. based on ultra sonic waves have been suggested to be used for discharging pulps from vessels but in practice these have been proved ineffective. When high-consistency pulps are discharged from large vessels the pulp is usually diluted in front of the outlet in order to make it flow out.
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In an embodiment according to the invention the pump is disposed into the outlet of the pulp vessel whereby a rotor running through the inlet part of the pump and the outlet of the pulp vessel fluidizes the pulp so that it can flow into the pump underneath due to the forces of gravity.
The invention is described in more detail below with references to the enclosed drawings in which:
Fig. 1 shows a vertical sectional view of one embodiment of an apparatus according to the invention;
Fig. 2 is a section C-C of Fig. l;
Fig. 3 is a vertical section of another embodiment of the present invention; and Fig~ 4 is section D-D of Fig. 3.
Turning now to the embodiments shown in Figs. 1 and 2, reference numeral 1 designates a pump housing including an inlet part 2. An impeller 3 is mounted for rotation within the housing. The impeller has vanes 4 and a back wall 5. The left-hand face of the impeller is open and the inner surface 6 of the pump housing near the impeller blades 4 is shaped such as to assist in guiding the flow of the pumped material.
The pump shown in Figs. 1 and 2 shows one type of means for generating shear forces disrupting the fibre-to-fibre bondings of the stock drawn towards the impeller. Reference numeral 8 designates a suction inlet whose shape is apparent from the view of Fig. 2. It will be observed from that figure that the cross-sectional configuration of the suction inlet 8 is that of a distorted square having concavely curved sides and rounded corners. Reference numeral 11 designates a rotor disposed within the suction inlet 8 and also having cross-sectional configuration of a distorted square as best seen from Fig. 2. The cross-sectional configuration, again, consists of slightly convexly curved sides and rounded corners.
In a typical example, the rotor 11 has a maxim~lm diameter of 85 mm and minimum diameter of about 75 mm, while the corres-ponding dimension~ of the suction inlet 8 are 150 mm and 130 mm, respectively. The speed of rotation of the shaft to which the rotor 11 and the impeller are both secured is 1,500 RPM. The flow rate is 3,000 - 7,500 litres per minute.
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It will be apparent on reviewing Fig. 2, that the rotation of the rotor 11 results, firstly, in imparting to the incoming stock a rotary motion about the axis of the shaft 9. Due to the particular shape of the sur~ace of the rotor 11 and of the interior surface of the suction inlet 8 as shown in Fig. 2, the rotating stock is furthermore sub-jected to impulses directed away and towards the axis of the shaft 9, due to the constantly changing clearance between the segments of the surface of the rotor 11 and the cavity of the suction inlet 8. Such pulsation generates the shearing forces which result in disrupting fibre-to-fibre bonds within the stock, with the result that the stock becomes fluidized and thus easily pumpable by the impeller 3.
The cross-sectional configuration of the suction inlet 8 and of the surface of the rotor 11 as shown in Fig. 2 thus form one embodiment of what can be generally described as a "non-round" or "non-circular" shape.
Those skilled in the art will readily appreciate that the distorted square-shape of the inlet 8 and of the rotor 11 can be replaced by other non-circular shapes which would also fulfil the function of generating pulsations within the incoming stock in generally radial direction. Such modifications of the shape would, however, still stay within the context of the present invention as recited in the accompanying claims.
The embodiment of Figs. 3 and 4 shows another type of the "non-circular" or "non-round" cross-sectional configuration of the respective elements within the meaning of the term in the context of the present invention.
In Figs. 3 and 4, the inlet or suction part 2 of the pump is connected to the outlet of a pulp vessel 13 in order to utilize the force of gravity in eeding the suction end of the pump. A rotor 15 extends through the inlet or suction part of the pump into the pulp vessel. It is mounted on the same shaft 6 as the impeller 5. The rotor is provided with rib-shaped lobes 16. The inlet or suction cavity of the pump casing and the discharge port of the vessel are each provided with inwardly protruding rib-shaped lobes 17, 18. The lobes 16, 17 and 18 extend generally axially with respect to the axis of rotation of the shaft 6.
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If required, the vessel 13 may be provided with a number of outlets each provided with a pump generally as outlined.
It will be appreciated, on review of Fig. 4, that the rotation of the rotor 15 results in pulsations being generated within the stock passing axially through the inlet of the pump, as in the embodiment of Fig. 1. The pulsations are formed by the combined action of lobes 16 imparting a rotary motion to the incoming pulp, in combination with the inwardly directed forces which are imparted to the pulp by the inwardly protruding lobes 17, 18.
The two embodiments shown in the accompanying drawings are indicative of the fact that many modifications of the pre-ferred embodiments may exist departing from the shape shown in the drawings, without departing from the scope of the present invention as set forth in the accompanying claims.
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METHOD AND APPAR~TUS FOR PUMPI~lG FIBRE SUSPENSIONS
The present invention relates in general to a method and an apparatus for pumping fibre suspensions and is particularly purposed to be applied in centrifugal pumps for fibre suspensions of high consistency.
Centrifugal pumps can successfully be used in the paper and cellulose industry for pumping fibre suspensions or pulps having consistencies less than 6% on condition that the pump has been correctly designed and that its input pressure is adequately high. A centrifugal pump is not, however, suitable for high consistency pulps as, owing to flocculation of the pulp, the pump tends to become clogged. Expensive pumps based on the displacement principle must therefore be used for pumping high-consistency pulps.
It is an object of the invention to provide a method and an apparatus which makes it possible to use centrifugal pumps for pumping pulps of considerably higher consistencies than until now.
According to the invention this is achieved by generating shear forces upstream of the impeller thus disrupting fibre agglomerations or flocs formed in the fibre suspension. The invention is based on the fact that the fibre suspension, when subjected to forces disrupting fibre-to-fibre bondings, becomes fluidized, i.e. is converted into an easily pumpable s~ate.
Compared with a conventional centrifugal pump, a pump according to the invention operates at a lower inlet pressure.
An apparatus according to the invention can eOg. be used for discharging pulps of consistencies from 5 to 25% from pulp vessels. According to known methods, pulp is discharged from a vessel by mechanical devices such as transport screws or rotating scrapers. Discharge of high-consist~ncy pulps requires much energy and robust constructions. Vibrating devices e.g. based on ultra sonic waves have been suggested to be used for discharging pulps from vessels but in practice these have been proved ineffective. When high-consistency pulps are discharged from large vessels the pulp is usually diluted in front of the outlet in order to make it flow out.
C
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In an embodiment according to the invention the pump is disposed into the outlet of the pulp vessel whereby a rotor running through the inlet part of the pump and the outlet of the pulp vessel fluidizes the pulp so that it can flow into the pump underneath due to the forces of gravity.
The invention is described in more detail below with references to the enclosed drawings in which:
Fig. 1 shows a vertical sectional view of one embodiment of an apparatus according to the invention;
Fig. 2 is a section C-C of Fig. l;
Fig. 3 is a vertical section of another embodiment of the present invention; and Fig~ 4 is section D-D of Fig. 3.
Turning now to the embodiments shown in Figs. 1 and 2, reference numeral 1 designates a pump housing including an inlet part 2. An impeller 3 is mounted for rotation within the housing. The impeller has vanes 4 and a back wall 5. The left-hand face of the impeller is open and the inner surface 6 of the pump housing near the impeller blades 4 is shaped such as to assist in guiding the flow of the pumped material.
The pump shown in Figs. 1 and 2 shows one type of means for generating shear forces disrupting the fibre-to-fibre bondings of the stock drawn towards the impeller. Reference numeral 8 designates a suction inlet whose shape is apparent from the view of Fig. 2. It will be observed from that figure that the cross-sectional configuration of the suction inlet 8 is that of a distorted square having concavely curved sides and rounded corners. Reference numeral 11 designates a rotor disposed within the suction inlet 8 and also having cross-sectional configuration of a distorted square as best seen from Fig. 2. The cross-sectional configuration, again, consists of slightly convexly curved sides and rounded corners.
In a typical example, the rotor 11 has a maxim~lm diameter of 85 mm and minimum diameter of about 75 mm, while the corres-ponding dimension~ of the suction inlet 8 are 150 mm and 130 mm, respectively. The speed of rotation of the shaft to which the rotor 11 and the impeller are both secured is 1,500 RPM. The flow rate is 3,000 - 7,500 litres per minute.
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It will be apparent on reviewing Fig. 2, that the rotation of the rotor 11 results, firstly, in imparting to the incoming stock a rotary motion about the axis of the shaft 9. Due to the particular shape of the sur~ace of the rotor 11 and of the interior surface of the suction inlet 8 as shown in Fig. 2, the rotating stock is furthermore sub-jected to impulses directed away and towards the axis of the shaft 9, due to the constantly changing clearance between the segments of the surface of the rotor 11 and the cavity of the suction inlet 8. Such pulsation generates the shearing forces which result in disrupting fibre-to-fibre bonds within the stock, with the result that the stock becomes fluidized and thus easily pumpable by the impeller 3.
The cross-sectional configuration of the suction inlet 8 and of the surface of the rotor 11 as shown in Fig. 2 thus form one embodiment of what can be generally described as a "non-round" or "non-circular" shape.
Those skilled in the art will readily appreciate that the distorted square-shape of the inlet 8 and of the rotor 11 can be replaced by other non-circular shapes which would also fulfil the function of generating pulsations within the incoming stock in generally radial direction. Such modifications of the shape would, however, still stay within the context of the present invention as recited in the accompanying claims.
The embodiment of Figs. 3 and 4 shows another type of the "non-circular" or "non-round" cross-sectional configuration of the respective elements within the meaning of the term in the context of the present invention.
In Figs. 3 and 4, the inlet or suction part 2 of the pump is connected to the outlet of a pulp vessel 13 in order to utilize the force of gravity in eeding the suction end of the pump. A rotor 15 extends through the inlet or suction part of the pump into the pulp vessel. It is mounted on the same shaft 6 as the impeller 5. The rotor is provided with rib-shaped lobes 16. The inlet or suction cavity of the pump casing and the discharge port of the vessel are each provided with inwardly protruding rib-shaped lobes 17, 18. The lobes 16, 17 and 18 extend generally axially with respect to the axis of rotation of the shaft 6.
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' : ' ,. .
.
,:
- , :
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If required, the vessel 13 may be provided with a number of outlets each provided with a pump generally as outlined.
It will be appreciated, on review of Fig. 4, that the rotation of the rotor 15 results in pulsations being generated within the stock passing axially through the inlet of the pump, as in the embodiment of Fig. 1. The pulsations are formed by the combined action of lobes 16 imparting a rotary motion to the incoming pulp, in combination with the inwardly directed forces which are imparted to the pulp by the inwardly protruding lobes 17, 18.
The two embodiments shown in the accompanying drawings are indicative of the fact that many modifications of the pre-ferred embodiments may exist departing from the shape shown in the drawings, without departing from the scope of the present invention as set forth in the accompanying claims.
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Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for pumping fibrous suspension with a centrifugal pump having a suction inlet, a housing, an impeller with vanes and an outlet, said method comprising the steps of imparting to the suspension at the inlet of the pump a rotary motion about the axis of rotation of the impeller, while simultaneously gen-erating within the rotary suspension alternating flow components directed generally radially towards and away from the axis of rotation of the impeller, whereby the shearing forces are gen-erated within the suspension passing through the inlet, to disrupt the fibre-to-fibre bond of the suspension before it reaches said impeller.
2. A centrifugal pump for pumping fibrous suspension, comprising, in combination:
(a) a pump housing including a suction inlet and a pressure outlet;
(b) an impeller including vanes and mounted in said housing for rotation about an axis of rotation;
(c) rotation imparting means disposed at said inlet and adapted to induce rotation of the suspension passing through same;
(d) radial pulsation generating means for generating within the rotating suspension alternating flow components directed generally radially towards and away from the axis of rotation of the impeller, whereby shearing forces are generated within the suspension passing through the inlet to disrupt the fibre-to-fibre bond of the suspension before it reaches said impeller.
(a) a pump housing including a suction inlet and a pressure outlet;
(b) an impeller including vanes and mounted in said housing for rotation about an axis of rotation;
(c) rotation imparting means disposed at said inlet and adapted to induce rotation of the suspension passing through same;
(d) radial pulsation generating means for generating within the rotating suspension alternating flow components directed generally radially towards and away from the axis of rotation of the impeller, whereby shearing forces are generated within the suspension passing through the inlet to disrupt the fibre-to-fibre bond of the suspension before it reaches said impeller.
3. A pump as claimed in claim 2, wherein said rotation imparting means is a rotor located in said suction inlet and having a non-circular cross-sectional configuration, said rotor being coaxial with and arranged for rotation about said axis of rotation, said non-circular cross-sectional configuration forming a first segment portion of the surface of the rotor more remote from said axis than a second segment portion of the surface of the rotor.
4. A pump as claimed in claim 3, wherein said generally radial pulsation generating means includes inside wall means of said suction inlet, said inside wall means having a non-circular cross-sectional configuration and being coaxial with said axis of rotation, said non-circular cross-sectional configuration forming a first segment portion of the surface of the inside wall means more remote from said axis of rotation than a second segment portion of the surface of the inside walls means, whereby said inside wall means co-operates with said rotor in generating said radial pulsations.
5. A pump as claimed in claim 3, wherein the cross-sectional configuration of said rotor is that of a distorted square having rounded corners forming said first segment portion of the rotor, and slightly convexly curved sides forming said second segment portion of the rotor.
6. A pump as claimed in claim 4, wherein the cross-sectional configuration of said inside wall means is that of a distorted square having rounded corners forming said first segment portion of the surface of the inside wall means, and slightly concavely curved sides forming said second segment portion of the surface of the inside wall means.
7. A pump as claimed in claim 4, wherein:
(a) the cross-sectional configuration of said rotor is that of a distorted square having rounded corners forming said first segment portion of the rotor, and slightly convexly curved sides forming said second segment portion of the rotor;
and (b) the cross-sectional configuration of said inside wall means is that of a distorted square having rounded corners forming said first segment portion of the surface of the inside wall means, and slightly concavely curved sides forming said second segment portion of the surface of the inside wall means.
(a) the cross-sectional configuration of said rotor is that of a distorted square having rounded corners forming said first segment portion of the rotor, and slightly convexly curved sides forming said second segment portion of the rotor;
and (b) the cross-sectional configuration of said inside wall means is that of a distorted square having rounded corners forming said first segment portion of the surface of the inside wall means, and slightly concavely curved sides forming said second segment portion of the surface of the inside wall means.
8. A pump as claimed in claim 3, wherein the cross-sectional configuration of said rotor is that of cylindric segments integral with radial ribs extending parallel with the axis of rotation, said ribs thus forming said first segment portion of the surface of the rotor, said cylindric segments forming the second segment portion of the surface of the rotor.
9. A pump as claimed in claim 4, wherein the cross-sectional configuration of said inside wall means is that of hollow cylindric segments integral with radial ribs extending radially inwardly and being parallel with the axis of rotation, said hollow cylindric segments thus forming said first segment portion of the surface of the inside wall means, said ribs extending radially inwardly forming said second segment portion of the inside wall means.
10. A pump as claimed in claim 4, wherein:
(a) the cross sectional configuration of said rotor is that of cylindric segments integral with radial ribs extending parallel with the axis of rotation, said ribs thus forming said first segment portion of the surface of the rotor, said cylindric segments forming the second segment portion of the surface of the rotor; and (b) the cross-sectional configuration of said inside wall means is that of hollow cylindric segments integral with radial ribs extending radially inwardly and being parallel with the axis of rotation, said hollow cylindric segments thus form-ing said first segment portion of the surface of the inside wall means, said ribs extending radially inwardly forming said second segment portion of the inside wall means.
(a) the cross sectional configuration of said rotor is that of cylindric segments integral with radial ribs extending parallel with the axis of rotation, said ribs thus forming said first segment portion of the surface of the rotor, said cylindric segments forming the second segment portion of the surface of the rotor; and (b) the cross-sectional configuration of said inside wall means is that of hollow cylindric segments integral with radial ribs extending radially inwardly and being parallel with the axis of rotation, said hollow cylindric segments thus form-ing said first segment portion of the surface of the inside wall means, said ribs extending radially inwardly forming said second segment portion of the inside wall means.
11. A pump as claimed in claim 4, wherein:
(a) the cross sectional configuration of said rotor is that of four cylindric segments integral with four radial ribs extending parallel with the axis of rotation, said ribs thus forming said first segment portion of the surface of the rotor, said cylindric segments forming the second segment portion of the surface of the rotor; and (b) the cross-sectional configuration of said inside wall means is that of four hollow cylindric segments integral with four radial ribs extending radially inwardly and being parallel with the axis of rotation, said hollow cylindric segments thus forming said first segment portion of the surface of the inside wall means, said ribs extending radially inwardly forming said second segment portion of the inside wall means.
(a) the cross sectional configuration of said rotor is that of four cylindric segments integral with four radial ribs extending parallel with the axis of rotation, said ribs thus forming said first segment portion of the surface of the rotor, said cylindric segments forming the second segment portion of the surface of the rotor; and (b) the cross-sectional configuration of said inside wall means is that of four hollow cylindric segments integral with four radial ribs extending radially inwardly and being parallel with the axis of rotation, said hollow cylindric segments thus forming said first segment portion of the surface of the inside wall means, said ribs extending radially inwardly forming said second segment portion of the inside wall means.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI771541 | 1977-05-16 | ||
| FI771541A FI62871B (en) | 1977-05-16 | 1977-05-16 | FOERFARANDE FOER PUMPNING AV EN FIBERSUSPENSION |
| FI781071 | 1978-04-10 | ||
| FI781071A FI82728C (en) | 1977-05-16 | 1978-04-10 | Device for pumping a fiber suspension |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1128368A true CA1128368A (en) | 1982-07-27 |
Family
ID=26156874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA303,324A Expired CA1128368A (en) | 1977-05-16 | 1978-05-15 | Method and apparatus for pumping fibre suspensions |
Country Status (16)
| Country | Link |
|---|---|
| JP (1) | JPS5416702A (en) |
| AT (1) | AT357043B (en) |
| AU (1) | AU514833B2 (en) |
| BR (1) | BR7803004A (en) |
| CA (1) | CA1128368A (en) |
| CS (1) | CS223822B2 (en) |
| DE (1) | DE2818540C3 (en) |
| ES (1) | ES469724A1 (en) |
| FI (1) | FI82728C (en) |
| FR (1) | FR2391378A1 (en) |
| GB (1) | GB1589134A (en) |
| IN (1) | IN150144B (en) |
| IT (1) | IT1108104B (en) |
| NO (1) | NO150574C (en) |
| NZ (1) | NZ187259A (en) |
| SE (1) | SE438714B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5413460A (en) * | 1993-06-17 | 1995-05-09 | Goulds Pumps, Incorporated | Centrifugal pump for pumping fiber suspensions |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI62871B (en) | 1977-05-16 | 1982-11-30 | Ahlstroem Oy | FOERFARANDE FOER PUMPNING AV EN FIBERSUSPENSION |
| FI69683C (en) * | 1982-02-08 | 1986-03-10 | Ahlstroem Oy | CENTRIFUGALPUMP FOER VAETSKOR INNEHAOLLANDE FASTA AEMNEN |
| FI67580C (en) * | 1983-07-12 | 1985-04-10 | Ahlstroem Oy | FOERFARANDE OCH ANORDNING FOER FIBRERING SILNING OCH PUMPNING AV CELLULOSAMASSA OCH RETURPAPPER |
| JPS61198593U (en) * | 1985-05-31 | 1986-12-11 | ||
| US4776758A (en) * | 1987-07-06 | 1988-10-11 | Kamyr Ab | Combined fluidizing and vacuum pump |
| FI85751B (en) * | 1988-06-17 | 1992-02-14 | Ahlstroem Oy | FOERFARANDE OCH ANORDNING FOER PUMPNING AV TJOCKT MEDIUM. |
| SE464318B (en) * | 1990-02-28 | 1991-04-08 | Flygt Ab | SHAFT CONSTRUCTION FOR A PUMP WHEEL ROTARY RUBBER |
| JP2636966B2 (en) * | 1990-12-20 | 1997-08-06 | 株式会社三興ポンプ製作所 | Submersible pump for drain with cutter |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE564826C (en) * | 1932-11-23 | Siemens Schuckertwerke Akt Ges | Device for conveying gases or liquids with a helical gear in the inlet channel of a centrifugal motor and a diffuser connected between the helical and centrifugal motor and flowed through from the inside to the outside | |
| DE704138C (en) * | 1938-11-18 | 1941-03-24 | Masch Fabriken Wagner Doerries | Face plate holder with horizontal shaft |
| DE836435C (en) * | 1941-11-20 | 1952-04-15 | Clyde Paper Company Ltd | Method and device for defibrating paper pulp |
| US2371681A (en) * | 1943-01-18 | 1945-03-20 | Jr Augustus C Durdin | Centrifugal cutting pump |
| DE1000677B (en) * | 1952-12-20 | 1957-01-10 | Doerries A G Vorm Maschinenfab | Refiner |
| US3128051A (en) * | 1960-11-07 | 1964-04-07 | Dag Mfg Co | Pump |
| CH411584A (en) * | 1964-07-10 | 1966-04-15 | Kolb Eugen Ag | Centrifugal pump for pumping contaminated liquids |
| CH459510A (en) * | 1966-07-08 | 1968-07-15 | Sulzer Ag | Prefabricated installation element for air conditioning systems |
| BE724376A (en) * | 1967-12-15 | 1969-05-22 | ||
| DE1703075A1 (en) * | 1968-03-28 | 1972-01-13 | Moertl Karl | Clearance for pump suction pipes |
| IE34587B1 (en) * | 1969-05-19 | 1975-06-25 | Warman Equip | Centrifugal froth pump |
| DE2411043A1 (en) * | 1974-03-08 | 1975-09-18 | Abs Pumps Ltd | Submerged sewage pump with disintegrator - exerts disintegrating forces in radial direction by radial rounded teeth on discs |
| US3961758A (en) * | 1974-08-23 | 1976-06-08 | Peabody Barnes, Inc. | Centrifugal pump with integral grinder |
| CH582788A5 (en) * | 1974-09-23 | 1976-12-15 | Escher Wyss Gmbh | |
| GB1568388A (en) * | 1975-11-29 | 1980-05-29 | Blum A | Pump with comminuating means at the inlet |
-
1978
- 1978-04-10 FI FI781071A patent/FI82728C/en not_active IP Right Cessation
- 1978-04-27 DE DE2818540A patent/DE2818540C3/en not_active Expired
- 1978-05-04 AU AU35758/78A patent/AU514833B2/en not_active Expired
- 1978-05-04 IN IN484/CAL/78A patent/IN150144B/en unknown
- 1978-05-08 GB GB18175/78A patent/GB1589134A/en not_active Expired
- 1978-05-09 NO NO781627A patent/NO150574C/en unknown
- 1978-05-11 ES ES469724A patent/ES469724A1/en not_active Expired
- 1978-05-11 CS CS783028A patent/CS223822B2/en unknown
- 1978-05-12 NZ NZ187259A patent/NZ187259A/en unknown
- 1978-05-12 BR BR7803004A patent/BR7803004A/en unknown
- 1978-05-12 SE SE7805509A patent/SE438714B/en not_active IP Right Cessation
- 1978-05-15 IT IT68105/78A patent/IT1108104B/en active
- 1978-05-15 CA CA303,324A patent/CA1128368A/en not_active Expired
- 1978-05-16 FR FR7814378A patent/FR2391378A1/en active Granted
- 1978-05-16 JP JP5814378A patent/JPS5416702A/en active Granted
- 1978-05-16 AT AT352578A patent/AT357043B/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5413460A (en) * | 1993-06-17 | 1995-05-09 | Goulds Pumps, Incorporated | Centrifugal pump for pumping fiber suspensions |
Also Published As
| Publication number | Publication date |
|---|---|
| NO150574B (en) | 1984-07-30 |
| ES469724A1 (en) | 1979-09-16 |
| AU514833B2 (en) | 1981-02-26 |
| SE7805509L (en) | 1978-11-17 |
| IN150144B (en) | 1982-07-31 |
| NO781627L (en) | 1978-11-17 |
| AU3575878A (en) | 1979-11-08 |
| FI82728B (en) | 1990-12-31 |
| FR2391378B1 (en) | 1982-04-23 |
| GB1589134A (en) | 1981-05-07 |
| JPS5416702A (en) | 1979-02-07 |
| SE438714B (en) | 1985-04-29 |
| FR2391378A1 (en) | 1978-12-15 |
| IT7868105A0 (en) | 1978-05-15 |
| NO150574C (en) | 1984-11-07 |
| AT357043B (en) | 1980-06-10 |
| IT1108104B (en) | 1985-12-02 |
| DE2818540C3 (en) | 1984-08-30 |
| FI781071A (en) | 1979-10-11 |
| CS223822B2 (en) | 1983-11-25 |
| DE2818540B2 (en) | 1979-04-12 |
| JPS6246713B2 (en) | 1987-10-03 |
| NZ187259A (en) | 1981-05-01 |
| BR7803004A (en) | 1979-05-29 |
| FI82728C (en) | 1991-04-10 |
| DE2818540A1 (en) | 1978-11-30 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |