EP1415094A1 - Pulp pump - Google Patents

Pulp pump

Info

Publication number
EP1415094A1
EP1415094A1 EP02763142A EP02763142A EP1415094A1 EP 1415094 A1 EP1415094 A1 EP 1415094A1 EP 02763142 A EP02763142 A EP 02763142A EP 02763142 A EP02763142 A EP 02763142A EP 1415094 A1 EP1415094 A1 EP 1415094A1
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.)
Granted
Application number
EP02763142A
Other languages
German (de)
French (fr)
Other versions
EP1415094B1 (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
Publication of EP1415094A1 publication Critical patent/EP1415094A1/en
Application granted granted Critical
Publication of EP1415094B1 publication Critical patent/EP1415094B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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.
  • 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.
  • liquid which is required for their function, operation, control and sealing, is supplied separately on both sides of the vacuum pump for the said purposes. This implies two connections for liquid and, on the whole, higher liquid addition.
  • 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. Only one liquid inlet must be connected to the sealing, which in its turn supplies operational liquid to the vacuum pump.
  • Fig. 1 is a cross-section of a centrifugal pump according to the invention
  • Fig. 2 shows schematically the coupling between gas inlet and gas outlet to and from 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%.
  • 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 further is formed with openings 19 for the discharge of gas collected in front of the impeller.
  • Behind the impeller 14 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)

Abstract

Centrifugal pumps for pumping a pulp suspension and conducting gas away from the pulp suspension are disclosed including a pump housing having an inlet and an outlet, a rotary shaft, an impeller mounted on the rotary shaft within the pump housing, the impeller including a hub and pump blades extending outwardly from the hub, a wheel disk adjacent to the impeller so that the pump blades extend outwardly along the wheel disk, a vacuum impeller within the pump housing behind the wheel disk and including a vacuum pump housing, vacuum impeller blades, 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 therefrom.

Description

Pulp pump
This invention relates to a centrifugal pump for pulp suspensions of lignocellulosic material. 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.
In cases where a separate vacuum pump is used, 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. At, for example, 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. In cases when the vacuum pump is controlled by means of additional air, as shown in EP 298989, a great amount of air is supplied to a pump system, at which the intention is, that air should be removed therefrom. In conventional built-in vacuum pumps liquid, which is required for their function, operation, control and sealing, is supplied separately on both sides of the vacuum pump for the said purposes. This implies two connections for liquid and, on the whole, higher liquid addition.
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.
According to the invention, 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. Only one liquid inlet must be connected to the sealing, which in its turn supplies operational liquid to the vacuum pump. The characterizing features of the invention are defined in the attached claims.
The invention is described in greater detail in the following, with reference to the accompanying Figures illustrating an embodiment of the invention.
Fig. 1 is a cross-section of a centrifugal pump according to the invention;
Fig. 2 shows schematically the coupling between gas inlet and gas outlet to and from 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%. On 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. 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. Behind the impeller 14 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. In the front wall 24 a suction port 25 for gas and an exhaust port 26 for gas are located. 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. On the rear side of the impeller 14 between the wheel disk 17 and front wall 24 of the vacuum pump housing a gas passage 29 for communication between the openings 19 in the wheel disk 17 and suction port 25 is located.
Behind the rear wall 23 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.
By using a common liquid inlet 32 for the sealing 31 and vacuum pump housing 21 , 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. By means of 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. At the same time the design is simpler and easier to control. 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.
The invention, of course, is not restricted to the embodiment shown, but can be varied within the scope of the claims with reference to the description and Figures.

Claims

Claims
1. A centrifugal pump for pumping a pulp suspension while simultaneously conducting gas away from the suspension, comprising a pump housing (10) with an inlet (11) and an outlet (12) for the pulp suspension and an impeller (14) mounted on a rotary shaft with pump blades (15), which extend from a hub (16) outward along a wheel disk (17), and openings for conducting away the gas formed in the wheel disk, and a vacuum impeller with vacuum impeller blades (20) surrounded by a vacuum pump housing (21) with a sealing (31) to the shaft, characterized in that a suction port (25) and, respectively, exhaust port (26) for gas to and, respectively, from the vacuum pump housing (21) are located on one side of the vacuum pump housing closest to the impeller (14), and that a liquid inlet (32) is connected to a sealing housing (30) for the sealing (31) on the other side of the vacuum pump housing (21), and that the sealing housing in its turn communicates with the vacuum pump housing (21) for the supply of liquid to the vacuum pump housing via the sealing.
2. A centrifugal pump as defined in claim 1, characterized in that the suction port (25) and exhaust port (26) of the vacuum pump housing (21) are in controllable connection with each other.
3. A centrifugal pump as defined in claim 2, characterized in that the suction port (25) and exhaust port (26) communicate by means of a channel (35) with a valve for controlling the vacuum in the vacuum system.
EP02763142A 2001-08-08 2002-07-08 Pulp pump Expired - Lifetime EP1415094B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0102678A SE519641C2 (en) 2001-08-08 2001-08-08 Combined centrifugal and vacuum pump for pumping pulp
SE0102678 2001-08-08
PCT/SE2002/001358 WO2003014572A1 (en) 2001-08-08 2002-07-08 Pulp pump

Publications (2)

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

Family

ID=20284996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02763142A Expired - Lifetime EP1415094B1 (en) 2001-08-08 2002-07-08 Pulp pump

Country Status (6)

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

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 (en) 2010-07-13 2010-07-13 Olli Joutsimo Improved chemical pulp manufacturing process
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 (en) * 2016-11-23 2017-03-15 深圳中广核工程设计有限公司 Self priming pump
DE102020125805A1 (en) * 2020-10-02 2022-04-07 Frideco Ag Pump system and method of operating a pump system

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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 (en) * 1983-10-18 1985-04-25 Siemens AG, 1000 Berlin und 8000 München LIQUID RING PUMP
FR2556788B1 (en) 1983-12-14 1988-04-22 Laguilharre Pierre IMPROVEMENT IN VACUUM PUMP-TYPE INSTALLATIONS SUPPLIED BY A REFRIGERATION LIQUID AT CONSTANT PRESSURE
US4776758A (en) 1987-07-06 1988-10-11 Kamyr Ab Combined fluidizing and vacuum pump
FI87049C (en) * 1990-02-02 1992-11-25 Ahlstroem Oy ANORDING FOR SEPARATION OF 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 (en) * 1991-12-03 1996-09-09 Kvaerner Pulping Tech Pump with built-in vacuum pump
DE4139943A1 (en) 1991-12-04 1993-06-09 Oku-Automatik Otto Kurz Gmbh & Co Kg, 7065 Winterbach, De METHOD AND DEVICE FOR THE AUTOMATED ASSEMBLY OF A SLIDER ON A MAGNETIC TAPE CASSETTE
SE502127C2 (en) 1993-12-01 1995-08-28 Kvaerner Pulping Tech Device at a vacuum pump for venting the suspension pump
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 (en) * 1998-10-13 2000-06-12 Valmet Fibertech Ab Pulp Pump

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Title
See references of WO03014572A1 *

Also Published As

Publication number Publication date
ATE491094T1 (en) 2010-12-15
SE0102678L (en) 2003-02-09
WO2003014572A1 (en) 2003-02-20
EP1415094B1 (en) 2010-12-08
SE519641C2 (en) 2003-03-25
SE0102678D0 (en) 2001-08-08
DE60238538D1 (en) 2011-01-20
US20050053496A1 (en) 2005-03-10

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