GB1589134A - Method and apparatus for pumping fibre suspension - Google Patents
Method and apparatus for pumping fibre suspension Download PDFInfo
- Publication number
- GB1589134A GB1589134A GB18175/78A GB1817578A GB1589134A GB 1589134 A GB1589134 A GB 1589134A GB 18175/78 A GB18175/78 A GB 18175/78A GB 1817578 A GB1817578 A GB 1817578A GB 1589134 A GB1589134 A GB 1589134A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impeller
- pump
- fibre
- inlet part
- fibre suspension
- 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
- 239000000835 fiber Substances 0.000 title claims description 49
- 239000000725 suspension Substances 0.000 title claims description 43
- 238000005086 pumping Methods 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 13
- 230000007423 decrease Effects 0.000 claims description 4
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 238000005243 fluidization Methods 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 244000144992 flock Species 0.000 description 1
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)
Description
(54) METHOD AND APPARATUS FOR PUMPING FIBRE SUSPENSION
(71) We, A. AHLSTRÖM OSAKEYHTIÖ of 29600 Noormarkku, Finland; a Finnish body corporate, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to a method and an apparatus for pumping fibre suspensions and utilizing a centrifugal pump and is for pumping fibre suspensions or pulps 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 suspensions or pulps as, owing to flocculation of the pulp, the pump will be clogged. Expensive pumps based on the positive displacement principle must therefore be used for pumping high-consistency suspensions or 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 suspensions or pulps of considerably higher consistencies than until now.
According to the present invention there is provided a method for pumping a high consistency fibre suspension with a centrifugal pump, characterized in that shear forces disrupting fibre-to-fibre bondings are generated in front of the impeller and/or at the front edges of the impeller vanes whereby the fibre suspension is fluidized and becomes capable of being pumped.
Also according to the present invention there is provided a centrifugal pump apparatus for pumping high consistency fibre suspension including means provided and adapted to fluidize the fibre suspension to facilitate pumping by generating shear forces disrupting fibre-to-fibre bondings in front of the impeller and/or at the front edges of the impeller vanes. Preferably the fluidizing means includes an inlet part having recesses and/or projections in its inner surface in front of an impeller and/or at the front edges of the impeller vanes, which co-operate with the impeller vanes, and/or a rotor having an outer surface in which there are recesses and/or projections disposed in the inlet part to generate shear forces which disrupt fibreto-fibre bondings and fluidize the fibre suspension.
The shear forces which are generated in the pump in front of the impeller and/or at the front edges of the impeller vanes, disrupt fibre agglomerations or flocks formed in the fibre suspension. The invention is based on the fact that the fibre suspension, when being subjected to forces disrupting fibre-to-fibre bondings, becomes fluidized, i.e. is converted into an easily pumpable state. Compared to a conventional centrifugal pump, a pump according to the invention operates at a lower inlet pressure.
An apparatus according to the invention can e.g. be used for discharging suspensions or pulps of consistencies from 5 to 25% from suspension or 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-consistency 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.
In an embodiment according to the invention the pump is disposed in 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 gravitational forces.
The invention will be described in more detail below, by way of example, with reference to the accompanying drawings, in which: Fig. 1 shows a vertical sectional view of one embodiment of an apparatus according to the invention,
Fig. 2 shows a section along line A-A in -Fig. 1, Fig. 3 shows another embodiment of the
invention,
Fig. 4 shows a section along line B-B in
Fig. 3,
Fig. 5 shows an alternative of the embodi -meat in Fig. 3,
Fig. 6 shows a section along line C-C in
Fig. 3,
Fig. 7 shows yet another embodiment of
the invention,
Fig. 8 shows a vertical sectional view of an
embodiment of the invention and
Fig. 9 shows a section along line D-D in
Fig. 8.
In figures 1 and 2 the numeral 1 refers to a
pump housing which includes an inlet part
2. In the housing there is an impeller 3
rotably journalled and having vanes 4 and a
back wall 5. One side of the impeller is open
and the inner surface 6 of the pump housing
having the form of the vane edge guides the
flow. By the front edges of the vanes there are
recesses 7 in the inner surface of the housing.
In the pulp or fibre suspension these bring
about flow components (iri Fig. 1 marked
with x) alternating in direction and deviating
from the main flow direction (marked with
y) and shear forces disrupting the fibre-to
fibre bondings as the width of the flow
passage in the impeller between the pump
housing and the back wall of the impeller
alternately increases and decreases when the
impeller rotates. Owing to this, the fibre
suspension becomes fluidized at the front
edges of the vanes and its flow resistance de
creases.
Figures 3 and 4 show another embodiment,
where the numerals 2 and 3 refer to the same parts as in figure 1. The outline 8 of the cross
section of the inlet part 2 is here non-round.
The fibre suspension flows thus to the impel
ler 3 through a pipe the cross section of which
is composed of deeper parts 9 further away
from the center and of shallower parts 10
closer to the center. While the impeller
rotates, the fibre suspension in the inlet part
is also brought into rotating motion and,
because of the non-round cross section,
subjected to shear forces as the cross section
in the direction of the Rotation: alternately
increases and decreases. Hereby the fibre
suspension becomes fluidized just in front of
the impeller and flows unhindered to the
vane passages of the impeller.
Figures 5 and 6 show an alternative where
a non-round rotor 11, has been disposed into
the inlet part 2 of the pump the cross section
outline 8 of which is non-round, to enhance
the rotating motion of the fibre suspension
and the fluidization in the inlet part.
Figure 7 shows yet another embodiment
where a vibrator 12 has been disposed in the
pump inlet part 2 to vibrate the fibre suspension in the inlet part so that it becomes fluidized.
Figures 8 and 9 show an embodiment of the invention where the inlet part 2 of the pump is connected to the outlet 14 of the pulp vessel 13 in order to remove pulp from the vessel.
A rotor 15 running through the inlet part of the pump and the outlet of the pulp vessel has been mounted on the same shaft 19 as the impeller 5. The rotor has been furnished with rib-shaped lobes 16 and the inlet part of the pump and the outlet of the pulp vessel with rib-shaped lobes 17, 18 the main direction of which is axial.
If necessary the pulp vessel may be provided with several outlets each of which is connected to a pump.
The invention is illustrated by the following examples.
Example 1
A rotor 11 according to Figs. 5 and 6 in the inlet part in front of the impeller had the following dimensions:
Max. diameter 85 mm
Min. diameter 75 mm
The corresponding dimensions of the inlet part were 150 mm and 130 mm.
Number of revolutions 1500 1/mien Flow rate 3000--7500 1/mien Example 2
Recesses 7 according to Figs. 1 and 2 at the front edges of the impeller vanes were made with a cylindrical cutter the diameter of which was 120 mm.
Max. depth 3 mm
Number 8
Diameter of inlet part 150 mm
Number of revolutions 1500 1/mien Flow rate 3000-7500 1/mien Tests have prooved that a pump according to the invention is well adapted for pumping various pulps used in the paper and cellulose industry having consistencies from 8 to 12%.
It is possible to pump pulps of even higher consistencies. When the consistency is less than 6% the pump operates at an inlet pressure which is 2 to 3 metres (water head) lower than a conventional pulp pump.
The invention is not limited to the embodiments presented here but several modifications can be made of it without departing from the principle of the invention. E.g. the rotor in front of the impeller can rotate at a different angular speed than the impeller 4:
WHAT WE CLAIM IS: 1 A method for pumping a high consistency fibre suspension with a centrifugal pump, characterized in that shear forces disrupting fibre-to-fibre bondings are generated in front of the impeller and/or at the front edges of the inpeller vanes whereby the fibre suspension is fluidized and becomes capable of being pumped.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (12)
- **WARNING** start of CLMS field may overlap end of DESC **.Fig. 2 shows a section along line A-A in -Fig. 1, Fig. 3 shows another embodiment of the invention, Fig. 4 shows a section along line B-B in Fig. 3, Fig. 5 shows an alternative of the embodi -meat in Fig. 3, Fig. 6 shows a section along line C-C in Fig. 3, Fig. 7 shows yet another embodiment of the invention, Fig. 8 shows a vertical sectional view of an embodiment of the invention and Fig. 9 shows a section along line D-D in Fig. 8.In figures 1 and 2 the numeral 1 refers to a pump housing which includes an inlet part2. In the housing there is an impeller 3 rotably journalled and having vanes 4 and a back wall 5. One side of the impeller is open and the inner surface 6 of the pump housing having the form of the vane edge guides the flow. By the front edges of the vanes there are recesses 7 in the inner surface of the housing.In the pulp or fibre suspension these bring about flow components (iri Fig. 1 marked with x) alternating in direction and deviating from the main flow direction (marked with y) and shear forces disrupting the fibre-to fibre bondings as the width of the flow passage in the impeller between the pump housing and the back wall of the impeller alternately increases and decreases when the impeller rotates. Owing to this, the fibre suspension becomes fluidized at the front edges of the vanes and its flow resistance de creases.Figures 3 and 4 show another embodiment, where the numerals 2 and 3 refer to the same parts as in figure 1. The outline 8 of the cross section of the inlet part 2 is here non-round.The fibre suspension flows thus to the impel ler 3 through a pipe the cross section of which is composed of deeper parts 9 further away from the center and of shallower parts 10 closer to the center. While the impeller rotates, the fibre suspension in the inlet part is also brought into rotating motion and, because of the non-round cross section, subjected to shear forces as the cross section in the direction of the Rotation: alternately increases and decreases. Hereby the fibre suspension becomes fluidized just in front of the impeller and flows unhindered to the vane passages of the impeller.Figures 5 and 6 show an alternative where a non-round rotor 11, has been disposed into the inlet part 2 of the pump the cross section outline 8 of which is non-round, to enhance the rotating motion of the fibre suspension and the fluidization in the inlet part.Figure 7 shows yet another embodiment where a vibrator 12 has been disposed in the pump inlet part 2 to vibrate the fibre suspension in the inlet part so that it becomes fluidized.Figures 8 and 9 show an embodiment of the invention where the inlet part 2 of the pump is connected to the outlet 14 of the pulp vessel 13 in order to remove pulp from the vessel.A rotor 15 running through the inlet part of the pump and the outlet of the pulp vessel has been mounted on the same shaft 19 as the impeller 5. The rotor has been furnished with rib-shaped lobes 16 and the inlet part of the pump and the outlet of the pulp vessel with rib-shaped lobes 17, 18 the main direction of which is axial.If necessary the pulp vessel may be provided with several outlets each of which is connected to a pump.The invention is illustrated by the following examples.Example 1 A rotor 11 according to Figs. 5 and 6 in the inlet part in front of the impeller had the following dimensions: Max. diameter 85 mm Min. diameter 75 mm The corresponding dimensions of the inlet part were 150 mm and 130 mm.Number of revolutions 1500 1/mien Flow rate 3000--7500 1/mien Example 2 Recesses 7 according to Figs. 1 and 2 at the front edges of the impeller vanes were made with a cylindrical cutter the diameter of which was 120 mm.Max. depth 3 mm Number 8 Diameter of inlet part 150 mm Number of revolutions 1500 1/mien Flow rate 3000-7500 1/mien Tests have prooved that a pump according to the invention is well adapted for pumping various pulps used in the paper and cellulose industry having consistencies from 8 to 12%.It is possible to pump pulps of even higher consistencies. When the consistency is less than 6% the pump operates at an inlet pressure which is 2 to 3 metres (water head) lower than a conventional pulp pump.The invention is not limited to the embodiments presented here but several modifications can be made of it without departing from the principle of the invention. E.g. the rotor in front of the impeller can rotate at a different angular speed than the impeller 4: WHAT WE CLAIM IS: 1 A method for pumping a high consistency fibre suspension with a centrifugal pump, characterized in that shear forces disrupting fibre-to-fibre bondings are generated in front of the impeller and/or at the front edges of the inpeller vanes whereby the fibre suspension is fluidized and becomes capable of being pumped.
- 2. A method according to claim 1, characterized in that the fibre suspension is vibrated.
- 3. A method according to claim 1, characterized in that the fibre suspension flowing to the impeller is brought into rotating motion having alternate flow components towards and away from its rotation axis.
- 4. A method according to claim 1, characterized in that flow components alternating in direction and deviating from the main direction of the flow of the fibre suspension are generated in the fibre suspension flowing in the impeller.
- 5. A centrifugal pump apparatus for pumping high consistency fibre suspension, including means provided and adapted to fluidize the fibre suspension to facilitate pumping by generating shear forces disrupting fibre-to-fibre bondings in front of the impeller and/or at the front edges of the impeller vanes.
- 6. Apparatus as claimed in claim 5, characterized in that it includes an inlet part having recesses and/or projections in its inner surface in front of an impeller and/or at the front edges 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 projections disposed in the inlet port to generate shear forces which disrupt fibre-to-fibre bondings and fluidize the fibre suspension.
- 7. A pump apparatus according to claim 6, characterized in that the rotor disposed in the inlet port of the pump is coupled with the impeller.
- 8. A pump apparatus according to claim 6, characterized in that the rotor disposed in the inlet part of the pump rotates at a different angular speed than the impeller.
- 9. A pump apparatus according to claim 7 or 8, characterized in that the rotor runs through the outlet of a pulp vessel connected to the pump.
- 10. An apparatus according to claim 9, characterized in that there are recesses and/or projections in the inner surface of the outlet of the pulp vessel.
- 11. A centrifugal pump apparatus constructed and arranged to operate substantially as herein described with reference to and as illustrated in the accompanying drawings.
- 12. A method of pumping a high consistency fibre suspension with a centrifugal pump substantially as herein described and illustrated with reference to the accompanying drawings
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI771541A FI62871B (en) | 1977-05-16 | 1977-05-16 | FOERFARANDE FOER PUMPNING AV EN FIBERSUSPENSION |
| FI781071A FI82728C (en) | 1977-05-16 | 1978-04-10 | Device for pumping a fiber suspension |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1589134A true GB1589134A (en) | 1981-05-07 |
Family
ID=26156874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18175/78A Expired GB1589134A (en) | 1977-05-16 | 1978-05-08 | Method and apparatus for pumping fibre suspension |
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 (2)
| 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 |
| RU2152540C1 (en) * | 1997-11-26 | 2000-07-10 | Муниципальное предприятие "РЕМСТРОЙБЛАГОУСТРОЙСТВО" | Centrifugal pump to transfer and milling of construction materials |
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 CS CS783028A patent/CS223822B2/en unknown
- 1978-05-11 ES ES469724A patent/ES469724A1/en not_active Expired
- 1978-05-12 SE SE7805509A patent/SE438714B/en not_active IP Right Cessation
- 1978-05-12 BR BR7803004A patent/BR7803004A/en unknown
- 1978-05-12 NZ NZ187259A patent/NZ187259A/en unknown
- 1978-05-15 CA CA303,324A patent/CA1128368A/en not_active Expired
- 1978-05-15 IT IT68105/78A patent/IT1108104B/en active
- 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 (2)
| 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 |
| RU2152540C1 (en) * | 1997-11-26 | 2000-07-10 | Муниципальное предприятие "РЕМСТРОЙБЛАГОУСТРОЙСТВО" | Centrifugal pump to transfer and milling of construction materials |
Also Published As
| Publication number | Publication date |
|---|---|
| SE7805509L (en) | 1978-11-17 |
| NZ187259A (en) | 1981-05-01 |
| FI82728C (en) | 1991-04-10 |
| JPS5416702A (en) | 1979-02-07 |
| DE2818540B2 (en) | 1979-04-12 |
| SE438714B (en) | 1985-04-29 |
| CS223822B2 (en) | 1983-11-25 |
| IT7868105A0 (en) | 1978-05-15 |
| CA1128368A (en) | 1982-07-27 |
| DE2818540A1 (en) | 1978-11-30 |
| FI82728B (en) | 1990-12-31 |
| FI781071A7 (en) | 1979-10-11 |
| AU3575878A (en) | 1979-11-08 |
| BR7803004A (en) | 1979-05-29 |
| DE2818540C3 (en) | 1984-08-30 |
| AT357043B (en) | 1980-06-10 |
| NO150574B (en) | 1984-07-30 |
| FR2391378A1 (en) | 1978-12-15 |
| AU514833B2 (en) | 1981-02-26 |
| JPS6246713B2 (en) | 1987-10-03 |
| IN150144B (en) | 1982-07-31 |
| FR2391378B1 (en) | 1982-04-23 |
| NO150574C (en) | 1984-11-07 |
| ES469724A1 (en) | 1979-09-16 |
| IT1108104B (en) | 1985-12-02 |
| NO781627L (en) | 1978-11-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19980507 |