US20050053496A1 - Pulp pump - Google Patents

Pulp pump Download PDF

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Publication number
US20050053496A1
US20050053496A1 US10/485,976 US48597604A US2005053496A1 US 20050053496 A1 US20050053496 A1 US 20050053496A1 US 48597604 A US48597604 A US 48597604A US 2005053496 A1 US2005053496 A1 US 2005053496A1
Authority
US
United States
Prior art keywords
pump housing
impeller
vacuum
vacuum pump
housing
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.)
Abandoned
Application number
US10/485,976
Other languages
English (en)
Inventor
Peter Danielsson
Bengt Algers
Amir Baniameri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Assigned to METSO PAPER, INC. reassignment METSO PAPER, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALGERS, BENGT, BANIAMERI, AMIR, DANIELSSON, PETER
Publication of US20050053496A1 publication Critical patent/US20050053496A1/en
Assigned to VALMET TECHNOLOGIES, INC. reassignment VALMET TECHNOLOGIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: METSO PAPER, INC.
Abandoned legal-status Critical Current

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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
    • F04D29/128—Shaft sealings using sealing-rings especially adapted for liquid pumps with special means for adducting cooling or sealing fluid
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/26—De-aeration of paper stock
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F04D9/041—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock the priming pump having evacuating action

Definitions

  • the present invention relates to a centrifugal pump for pulp suspensions of lignocellulosic material. More particularly, the present invention relates to a pump where gas, such as air, can be separated from the pulp in the pump.
  • Gas following along with the pulp creates problems during pumping of pulp by centrifugal pumps.
  • the gas in the pulp forms bubbles, which are accumulated in front of the impeller and thereby deteriorate the capacity of the pump.
  • This problem can be overcome by evacuating the gas from the space in front of the impeller, for example by means of vacuum pumps such as the liquid-ring pump type.
  • a pump can be a separate vacuum pump, the suction pipe of which is connected to the sealing space of the pulp pump, or it can be formed with a separate vacuum impeller in the form of a liquid-ring impeller, which is mounted on the shaft of the pulp pump, so that for both impellers a common operation is obtained.
  • the pulp pump becomes relatively complicated and expensive, because the system comprises more components compared to a pulp pump, where the vacuum impeller is mounted on the shaft of the pulp pump.
  • Swedish patent specification No. 502,127 and European patent specification No. 298,949 describe embodiments of pulp pumps where the vacuum impeller is mounted on the shaft of the pulp pump.
  • control of the capacity of the vacuum pump by adjustable throttling or resetting the eccentricity of the vacuum pump housing as shown in Swedish patent specification No. 502,127, several movable parts are required in the pump housing. This requires more or less extreme designs, with the concurrent risk of faulty functioning. The maintenance will also thus be more complicated and expensive.
  • European patent specification No. 298,949 a great amount of air is supplied to a pump system, with the intention being that air should be removed therefrom.
  • the present invention implies that the aforesaid problems can be eliminated.
  • the manufacture and maintenance costs for the pulp pump, for example, can be reduced.
  • the need of liquid for the operation is decreased, and control and sealing of the vacuum pump can be carried out more simply.
  • the need of air to be added to the pump can also be reduced substantially.
  • a centrifugal pump for pumping a pulp suspension and conducting gas away from the pulp suspension
  • the centrifugal pump comprising a pump housing including an inlet for the pulp suspension and an outlet for the pumped pulp suspension, a rotary shaft, an impeller mounted on the rotary shaft within the pump housing, the impeller including a hub, and a plurality of pump blades extending outwardly from the hub, a wheel disk adjacent to the impeller whereby the pump blades extend outwardly along the wheel disk, a vacuum impeller disposed within the pump housing behind the wheel disk, the vacuum impeller including a vacuum pump housing, a plurality of vacuum impeller blades disposed within the vacuum pump housing, and a seal for sealing the vacuum pump housing to the rotary shaft, the vacuum pump housing including a suction port for drawing gas into the vacuum pump housing and an exhaust port for expelling gas from the vacuum pump housing.
  • the centrifugal pump includes a channel connecting the suction port for drawing gas into the vacuum pump housing and an exhaust port for expelling gas from the
  • the vacuum pump housing includes a first side adjacent to the impeller and a second side distal from the impeller, the suction port and the exhaust port being disposed on the first side of the vacuum pump housing, the seal being disposed on the second side of the vacuum pump housing and including a sealed housing and a liquid inlet connected to the sealed housing, the sealed housing communicating with the vacuum pump housing to supply the liquid to the vacuum pump housing.
  • the pulp pump is formed so that the suction port and exhaust port of the vacuum pump housing are in controllable connection with each other.
  • FIG. 1 is a side, elevational, cross-sectional view of a centrifugal pump according to the present invention.
  • FIG. 2 is a side, elevational, schematic view of the coupling between gas inlet and gas outlet to and from the vacuum pump in accordance with the present invention.
  • the centrifugal pump shown in FIG. 1 comprises a pump housing 10 with an inlet 11 and an outlet 12 for the pulp suspension. Such pumps are used at relatively high pulp concentration, for example from about 6% to 18%.
  • an impeller 14 is mounted, the pump blades 15 of which extend from a hub 16 outward along a wheel disk 17 .
  • the wheel disk 17 is further formed with openings 19 for the discharge of gas collected in front of the impeller.
  • a vacuum impeller with vacuum impeller blades 20 is located, which impeller is surrounded by a vacuum pump housing 21 .
  • This vacuum pump housing 21 comprises an outer cylindrical wall 22 , a rear wall 23 and a front wall 24 .
  • the cylindrical wall 22 is eccentric in relation to the vacuum impeller blades 20 , so that a liquid ring pump is formed.
  • a suction port 25 for gas and an exhaust port 26 for gas are located in the front wall 24 .
  • These ports, 25 and 26 are placed at a distance from each other in the circumferential direction disposed for gas suction into the vacuum pump housing and gas exhaust from the vacuum pump housing, respectively. This effect is brought about in a manner which is known by the rotation of the vacuum impeller blades and the volume variation in the circumferential direction of the vacuum pump housing as a consequence of the eccentric position of the cylindrical wall 22 .
  • the exhaust port 26 communicates with a chamber 27 for gas evacuation through a gas outlet 28 .
  • a gas passage 29 for communication between the openings 19 in the wheel disk 17 and suction port 25 is located on the rear side of the impeller 14 between the wheel disk 17 and front wall 24 of the vacuum pump housing.
  • a sealing housing 30 with a shaft sealing 31 for the vacuum pump and pulp pump is located.
  • the sealing is intended for the flow-through of liquid, which is supplied by a liquid inlet 32 .
  • the sealing housing 30 also communicates with the vacuum pump housing 21 for the supply of liquid from the sealing to the vacuum pump.
  • the liquid amount can be restricted without problems. Only one liquid connection is required.
  • the pressure difference arising between the sealing housing 30 and vacuum pump housing implies a barrier for flow in the opposite direction, i.e. only clean water will be found in the surrounding of the sealing.
  • the suction port 25 and exhaust port 26 of the vacuum pump housing are in controllable connection with each other, for example by means of an overflow channel 35 with a device 36 for vacuum control.
  • this control device 36 the connection between the suction and exhaust side can be controlled without the use of air addition from the outside in order to prevent the pulp suspension from being sucked into the vacuum pump, if the pressure would be much too low. Instead of air addition from the outside a portion of the air is thus used which already has been sucked out of the pulp pump for the control. This implies a pump system with less air flows.
  • the control device 36 can be a valve in the overflow channel 35 , for example of the on/off type, a throttle valve or the like.
  • the control device can be controlled by signals from the system in a suitable way which is known per se.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US10/485,976 2001-08-08 2002-07-08 Pulp pump Abandoned US20050053496A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0102678-0 2001-08-08
SE0102678A SE519641C2 (sv) 2001-08-08 2001-08-08 Kombinerad centrifugal- och vakuumpump för pumpning av massa
PCT/SE2002/001358 WO2003014572A1 (en) 2001-08-08 2002-07-08 Pulp pump

Publications (1)

Publication Number Publication Date
US20050053496A1 true US20050053496A1 (en) 2005-03-10

Family

ID=20284996

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/485,976 Abandoned US20050053496A1 (en) 2001-08-08 2002-07-08 Pulp pump

Country Status (6)

Country Link
US (1) US20050053496A1 (sv)
EP (1) EP1415094B1 (sv)
AT (1) ATE491094T1 (sv)
DE (1) DE60238538D1 (sv)
SE (1) SE519641C2 (sv)
WO (1) WO2003014572A1 (sv)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080171436A1 (en) * 2007-01-11 2008-07-17 Asm Genitech Korea Ltd. Methods of depositing a ruthenium film
US20080274457A1 (en) * 2006-02-15 2008-11-06 The Ohio State University Research Foundation Methods for differentiating malignant from benign thyroid tissue
WO2012007642A1 (en) 2010-07-13 2012-01-19 Olli Joutsimo Improved method of processing chemical pulp
WO2014147293A1 (en) 2013-03-22 2014-09-25 Andritz Oy Method for producing nano- and microfibrillated cellulose
CN106499639A (zh) * 2016-11-23 2017-03-15 深圳中广核工程设计有限公司 自吸泵
GB2548472B (en) * 2016-02-09 2021-07-28 Brunswick Corp Centrifugal pumps having anti-air-locking features
US20220105858A1 (en) * 2020-10-02 2022-04-07 Frideco Ag Pump System and Method for Operating a Pump System

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581828A (en) * 1946-03-07 1952-01-08 Nash Engineering Co Pump
US2780999A (en) * 1951-12-12 1957-02-12 Borg Warner Fuel booster pump
US3082694A (en) * 1960-05-24 1963-03-26 Ingersoll Rand Co Self-priming centrifugal pump
US4565498A (en) * 1983-10-18 1986-01-21 Siemens Aktiengesellschaft Rotary gas compressor
US5114310A (en) * 1990-09-07 1992-05-19 A. Ahlstrom Corporation Centrifugal pump with sealing means
US5116198A (en) * 1990-09-07 1992-05-26 Ahlstrom Corporation Centrifugal pumping apparatus
US5141535A (en) * 1990-02-02 1992-08-25 A. Ahlstrom Corporation Apparatus for separating gas from a suspension
US5599171A (en) * 1995-05-15 1997-02-04 Itt Fluid Technology Corporation Rotary, self-priming, liquip pump, and an impellers and shaft assembly therefor, and a flexible-impeller pump assembly
US6200107B1 (en) * 1997-08-15 2001-03-13 The Boc Group Plc Vacuum pumping systems
US6488468B1 (en) * 1998-10-13 2002-12-03 Valmet Fibertech Ab Pulp pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556788B1 (fr) 1983-12-14 1988-04-22 Laguilharre Pierre Perfectionnement aux installations du type pompe a vide alimentee par un liquide de refrigeration sous pression constante
US4776758A (en) 1987-07-06 1988-10-11 Kamyr Ab Combined fluidizing and vacuum pump
US5151010A (en) 1990-09-07 1992-09-29 A. Ahlstrom Corporation Combined centrifugal and vacuum pump
SE468293C (sv) * 1991-12-03 1996-04-16 Kvaerner Pulping Tech Pump med inbyggd vakuumpump
DE4139943A1 (de) 1991-12-04 1993-06-09 Oku-Automatik Otto Kurz Gmbh & Co Kg, 7065 Winterbach, De Verfahren und vorrichtung zur automatisierten montage eines schiebers an einer magnetbandkassette
SE502127C2 (sv) 1993-12-01 1995-08-28 Kvaerner Pulping Tech Anordning vid en vakuumpump för avluftning av suspensionspump

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581828A (en) * 1946-03-07 1952-01-08 Nash Engineering Co Pump
US2780999A (en) * 1951-12-12 1957-02-12 Borg Warner Fuel booster pump
US3082694A (en) * 1960-05-24 1963-03-26 Ingersoll Rand Co Self-priming centrifugal pump
US4565498A (en) * 1983-10-18 1986-01-21 Siemens Aktiengesellschaft Rotary gas compressor
US5141535A (en) * 1990-02-02 1992-08-25 A. Ahlstrom Corporation Apparatus for separating gas from a suspension
US5114310A (en) * 1990-09-07 1992-05-19 A. Ahlstrom Corporation Centrifugal pump with sealing means
US5116198A (en) * 1990-09-07 1992-05-26 Ahlstrom Corporation Centrifugal pumping apparatus
US5599171A (en) * 1995-05-15 1997-02-04 Itt Fluid Technology Corporation Rotary, self-priming, liquip pump, and an impellers and shaft assembly therefor, and a flexible-impeller pump assembly
US6200107B1 (en) * 1997-08-15 2001-03-13 The Boc Group Plc Vacuum pumping systems
US6488468B1 (en) * 1998-10-13 2002-12-03 Valmet Fibertech Ab Pulp pump

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080274457A1 (en) * 2006-02-15 2008-11-06 The Ohio State University Research Foundation Methods for differentiating malignant from benign thyroid tissue
US7670775B2 (en) * 2006-02-15 2010-03-02 The Ohio State University Research Foundation Method for differentiating malignant from benign thyroid tissue
US20080171436A1 (en) * 2007-01-11 2008-07-17 Asm Genitech Korea Ltd. Methods of depositing a ruthenium film
WO2012007642A1 (en) 2010-07-13 2012-01-19 Olli Joutsimo Improved method of processing chemical pulp
US9139955B2 (en) 2010-07-13 2015-09-22 Olli Joutsimo Method of processing chemical pulp
WO2014147293A1 (en) 2013-03-22 2014-09-25 Andritz Oy Method for producing nano- and microfibrillated cellulose
GB2548472B (en) * 2016-02-09 2021-07-28 Brunswick Corp Centrifugal pumps having anti-air-locking features
CN106499639A (zh) * 2016-11-23 2017-03-15 深圳中广核工程设计有限公司 自吸泵
US20220105858A1 (en) * 2020-10-02 2022-04-07 Frideco Ag Pump System and Method for Operating a Pump System
EP3981988A1 (de) * 2020-10-02 2022-04-13 Frideco AG Pumpensystem und verfahren zum betrieb eines pumpensystems

Also Published As

Publication number Publication date
SE0102678L (sv) 2003-02-09
ATE491094T1 (de) 2010-12-15
DE60238538D1 (de) 2011-01-20
EP1415094A1 (en) 2004-05-06
WO2003014572A1 (en) 2003-02-20
SE519641C2 (sv) 2003-03-25
SE0102678D0 (sv) 2001-08-08
EP1415094B1 (en) 2010-12-08

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Legal Events

Date Code Title Description
AS Assignment

Owner name: METSO PAPER, INC., FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DANIELSSON, PETER;ALGERS, BENGT;BANIAMERI, AMIR;REEL/FRAME:016045/0529

Effective date: 20040113

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

AS Assignment

Owner name: VALMET TECHNOLOGIES, INC., FINLAND

Free format text: CHANGE OF NAME;ASSIGNOR:METSO PAPER, INC.;REEL/FRAME:032551/0426

Effective date: 20131212