EP1415094B1 - Zellstoffpumpe - Google Patents

Zellstoffpumpe Download PDF

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Publication number
EP1415094B1
EP1415094B1 EP02763142A EP02763142A EP1415094B1 EP 1415094 B1 EP1415094 B1 EP 1415094B1 EP 02763142 A EP02763142 A EP 02763142A EP 02763142 A EP02763142 A EP 02763142A EP 1415094 B1 EP1415094 B1 EP 1415094B1
Authority
EP
European Patent Office
Prior art keywords
pump housing
vacuum
impeller
vacuum pump
sealing
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 - Lifetime
Application number
EP02763142A
Other languages
English (en)
French (fr)
Other versions
EP1415094A1 (de
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
Publication of EP1415094A1 publication Critical patent/EP1415094A1/de
Application granted granted Critical
Publication of EP1415094B1 publication Critical patent/EP1415094B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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

  • This invention relates to a centrifugal pump for pulp suspensions of lignocellulosic material as defined in the preamble of claim 1.
  • a centrifugal pump for pulp suspensions of lignocellulosic material as defined in the preamble of claim 1.
  • Such a pump is known eg from any of EP-A-0 474 478 or WO 93/11359 .
  • the invention more precisely, relates to a pump where gas, such as air, can be separated from the pulp in the pump.
  • Gas following along with the pulp causes problems at pumping by centrifugal pumps.
  • the gas in the pulp is collected to 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 of the kind of liquid-ring pumps.
  • Such 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.
  • SE patent specification 502127 and EP patent specification 298949 describe embodiments of pulp pumps where the vacuum impeller is mounted on the shaft of the pulp pump.
  • SE 502127 the control of the capacity of the vacuum pump by adjustable throttling or re-setting the eccentricity of the vacuum pump housing, as shown in SE 502127 , several movable parts are required in the pump housing, This requires more or less extreme designs with the risk of faulty functioning. The maintenance, furthermore, will be more complicated and expensive.
  • a great amount of air is supplied to a pump system, at which the intention is, that air should be removed therefrom.
  • WO 95/15439 discloses a vacuum pump in which the vacuum function can be temporarily shut off by means of a valve.
  • EP 0 474 478 discloses a combined centrifugal and vacuum pump where an intermediate wall separates the centrifugal pumping chamber and the vacuum pump, the intermediate wall being provided with a non-annular opening for providing a passageway between the pumping chamber and the vacuum pump.
  • EP 0 148 069 a basic liquid-ring pump is shown having an inlet for gas and an outlet for gas located on the same side of its housing.
  • WO 93/11359 describes a conventional pump with built-in vacuum pump, where the vacuum impeller is mounted on the shaft of the pulp pump.
  • 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 be reduced substantially.
  • the pulp pump is formed with an integrated vacuum pump, where the gas inlet and gas outlet are located on one side of the vacuum pump housing and the respective inlet and outlet are in controllable connection with each other. Only one liquid inlet must be connected to the sealing, which in its turn supplies operational liquid to the vacuum pump.
  • the centrifugal pump shown 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 6-18%.
  • a rotary shaft 13 in the pump housing 10 an impeller 14 is mounted, the pump blades 15 of which extend from a hub 16 outward along a wheel disk 17.
  • a wheel disk 17 On the rear side of the wheel disk 17 back blades 18 are located.
  • the wheel disk 17 further is 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 cylindric wall 22, a rear wall 23 and a front wall 24.
  • the cylindric 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 25,26 are placed at a distance from each other in the circumferential direction counted for gas suction into the vacuum pump housing and, respectively, gas exhaust from the vacuum pump housing. This effect is brought about in a manner known per se 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 cylindric 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.
  • a sealing housing 30 with a shaft sealing 31 for the vacuum pump and pulp pump is located.
  • the sealing is intended to be flown through by liquid, which is supplied via a liquid inlet 32.
  • the sealing housing 30 communicates also 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 via 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 that pulp suspension is sucked into the vacuum pump, if the pressure would be much too low. Instead of air addition from the outside, thus, a portion of the air is 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 kind on/off, a throttle valve or the like.
  • the control device can be controlled by signals from the system in a suitable way 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)

Claims (1)

  1. Zentrifugalpumpe zum Pumpen einer Pülpeaufschlämmung, wobei simultan Gas aus der Aufschlämmung abgeleitet wird, umfassend ein Pumpengehäuse (10) mit einem Einlass (11) und einem Auslass (12) für die Pülpeaufschlämmung und einem Flügelrad (14), das an einer Drehwelle mit Pumpenblättern (15) befestigt ist, die sich von einer Nabe (16) nach außen entlang einer Radscheibe (17) erstrecken, mit Öffnungen, um das in der Radscheibe gebildete Gas wegzuführen und mit einem Vakuum-Flügelrad mit Vakuum-Flügelblättem (20), die von einem Vakuum-Pumpengehäuse (21) mit einer Dichtung (31) gegenüber dem Schaft umgeben sind, dadurch gekennzeichnet, dass eine Saugöffnung (25), und eine Auslassöffnung (26), für Gas in das, beziehungsweise aus dem, Vakuum-Pumpengehäuse (21) an der Seite des Vakuum-Pumpengehäuses, das am nächsten zum Flügelrad (14) angeordnet ist, vorgesehen sind, und dass ein Flüssigkeitseinlass (32) mit einem Dichtgehäuse (30) zum Abdichten (31) auf der anderen Seite des Vakuum-Pumpengehäuse (21) verbunden ist, und dass das Dichtungsgehäuse seinerseits mit dem Vakuum-Pumpengehäuse (21) für die Zufuhr von Flüssigkeit zum Vakuumpumpengehäuse über die Dichtung kommuniziert, und dadurch, dass der Saugöffnung (25) und die Auslassöffnung (26) des Vakuum-Pumpengehäuses (21) miteinander über einen Kanal (35) mit einem Ventil (36) in kontrollierbarer Verbindung zur Kontrolle des Vakuums im Vakuumsystem stehen.
EP02763142A 2001-08-08 2002-07-08 Zellstoffpumpe Expired - Lifetime EP1415094B1 (de)

Applications Claiming Priority (3)

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

Publications (2)

Publication Number Publication Date
EP1415094A1 EP1415094A1 (de) 2004-05-06
EP1415094B1 true EP1415094B1 (de) 2010-12-08

Family

ID=20284996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02763142A Expired - Lifetime EP1415094B1 (de) 2001-08-08 2002-07-08 Zellstoffpumpe

Country Status (6)

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

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FI20105799A0 (fi) 2010-07-13 2010-07-13 Olli Joutsimo Parantunut kemiallisen massan valmistusprosessi
WO2014147293A1 (en) 2013-03-22 2014-09-25 Andritz Oy Method for producing nano- and microfibrillated cellulose
US10087946B2 (en) * 2016-02-09 2018-10-02 Brunswick Corporation 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
DE102020125805A1 (de) * 2020-10-02 2022-04-07 Frideco Ag Pumpensystem und Verfahren zum Betrieb eines Pumpensystems

Family Cites Families (16)

* 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
DE3337837A1 (de) * 1983-10-18 1985-04-25 Siemens AG, 1000 Berlin und 8000 München Fluessigkeitsringpumpe
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
FI87049C (fi) * 1990-02-02 1992-11-25 Ahlstroem Oy Anordning foer separering av gas ur en suspension innehaollande gas
US5114310A (en) * 1990-09-07 1992-05-19 A. Ahlstrom Corporation Centrifugal pump with sealing means
US5151010A (en) 1990-09-07 1992-09-29 A. Ahlstrom Corporation Combined centrifugal and vacuum pump
US5116198A (en) * 1990-09-07 1992-05-26 Ahlstrom Corporation Centrifugal pumping apparatus
SE468293C (sv) * 1991-12-03 1996-09-09 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
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
GB9717400D0 (en) * 1997-08-15 1997-10-22 Boc Group Plc Vacuum pumping systems
SE512984C2 (sv) * 1998-10-13 2000-06-12 Valmet Fibertech Ab Massapump

Also Published As

Publication number Publication date
ATE491094T1 (de) 2010-12-15
SE0102678D0 (sv) 2001-08-08
SE0102678L (sv) 2003-02-09
EP1415094A1 (de) 2004-05-06
DE60238538D1 (de) 2011-01-20
US20050053496A1 (en) 2005-03-10
SE519641C2 (sv) 2003-03-25
WO2003014572A1 (en) 2003-02-20

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