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WO1993011359A1 - Pompe incorporant une pompe a vide - Google Patents

Pompe incorporant une pompe a vide Download PDF

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Publication number
WO1993011359A1
WO1993011359A1 PCT/SE1992/000828 SE9200828W WO9311359A1 WO 1993011359 A1 WO1993011359 A1 WO 1993011359A1 SE 9200828 W SE9200828 W SE 9200828W WO 9311359 A1 WO9311359 A1 WO 9311359A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
vacuum
impeller
gas
vacuum chamber
Prior art date
Application number
PCT/SE1992/000828
Other languages
English (en)
Inventor
Ronny Höglund
Ulf Jansson
Original Assignee
Kamyr Aktiebolag
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 Kamyr Aktiebolag filed Critical Kamyr Aktiebolag
Publication of WO1993011359A1 publication Critical patent/WO1993011359A1/fr

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04Pumps 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
    • F04D7/045Pumps 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00Working fluid
    • F05B2210/10Kind or type
    • F05B2210/13Kind or type mixed, e.g. two-phase fluid
    • F05B2210/132Pumps with means for separating and evacuating the gaseous phase

Definitions

  • the present invention relates to a pump for pumping a suspension of cellulosic fibrous material, said pump comprising a main housing having a suspension inlet and a suspension outlet generally perpendicular to the inlet; a shaft rotatable about an axis of rotation; a rotor mounted to said shaft for rotation therewith for effecting fluidization of the suspension; an impeller mounted to said shaft for rotation therewith for effecting pumping of the fluidized suspension; a vacuum pump of liquid ring type including a vacuum pump housing, a vacuum impeller mounted to said shaft for rotation therewith, a partition mounted between said main housing and the vacuum pump housing to separate the vacuum impeller from said impeller for pumping the suspension, and an end wall of the vacuum pump housing, said end wall and partition between them defining a cylindrical vacuum chamber in which the vacuum impeller rotates together with a liquid ring; a gas passage system extending from an area in the main housing in front of its impeller where gas separated out of the suspension by said rotor is collected, to an area outside the vacuum pump
  • the problems addressed by the invention are to be found in a make-up air passageway of the type described in US-4,776,758, corresponding to EP-0 298 949.
  • the known make-up air passageway has several bends and extends through a plurality of construction elements to achieve connection with the gas passage system for evacuation of gas at a point prior to the vacuum pump.
  • Such a make-up air passageway is time-consuming and complicated in manufacture, thus also increasing manufacturing costs.
  • the partition wall in front of the vacuum pump must be made as slim as possible and the radial part of the make-up air passageway formed in this partition wall is therefore relatively narrow.
  • the object of the invention is to substantially reduce the above-mentioned problems.
  • the invention thus aims at simplifying manufacture of the make-up air passageway in the vacuum pump, simplifying cleaning of the make-up air passageway if it becomes clogged by suspension, and also reducing the risk of such clogging.
  • said make-up air passageway is arranged in said end wall of the vacuum pump, extends through the end wall directly to said vacuum chamber and opens into this radially inside the liquid ring and circumferentially at a distance from the conduit of the gas passageway through which gas is evacuated from the vacuum chamber to outside the pump.
  • the make-up air passageway according to the invention is thus considerably shorter than in the known arrangement, which is an advantage both from the manufacturing and the cleaning aspects. Moreover, it is located further away from the suspension impeller than before, thus contributing to decreasing the risk of clogging.
  • Figure 1 is a longitudinal sectional view of a suspension pump with a built-in vacuum pump, provided with a make-up air passageway in accordance with the invention.
  • suspension pump for pumping a suspension of a cellulosic fibre material, particularly paper pulp of medium consistency, i.e. about 6-15% dry solids.
  • the suspension pump comprises a main housing 1 with a suspension inlet 2 and a suspension outlet 3.
  • the outlet 3 is generally
  • the suspension pump includes a shaft 4 rotatable about an axis of rotation 5 and driven by a motor 6.
  • the inlet 2 is concentric with respect to the axis of rotation 5.
  • the housing 1 has a cylindrical part 7 extending from the inlet 2 and, in
  • a wall member closes the suspension pump at its end facing away from the suspension inlet 2, said wall member including a partition 9 and an end wall 10, through which
  • the suspension pump comprises an impeller 12 of radial 30 wheel type mounted to said shaft 4 for rotation in the • * • radially enlarged housing part 8.
  • the impeller 12 has a plurality of front blades 13 with their side edges facing • ⁇ the suspension inlet 2 and a plurality of rear blades 14 with their side edges facing the partition wall 9.
  • the suspension pump is also provided with a fluidizing rotor 15 mounted to the shaft 4 via the impeller 12.
  • the rotor comprises a plurality of blades 16 attached to the impeller 12 and extending at a distance from and parallel to the axis of rotation 5 and the cylindrical inside of the housing part 7.
  • the suspension pump may be applied horizontally or vertically in an opening in the bottom of a container containing pulp of medium consistency.
  • the rapid rotation of the rotor blades 16 sets the pulp in motion at such high speed and causes such turbulence in the pulp that this is fluidized to pumpable condition.
  • the gas present in larger or smaller quantities in the fiber suspension will collect in front of the first impeller during the fluidization process, forming a gas bubble 19.
  • the gas is evacuated via a system of gas passageways including, inter alia, a plurality of small axial holes 20 in the impeller 12, the inner part 21 of the space between the impeller 12 and the partition 9, and an annular passage 22 through the partition 9.
  • the suspension pump is also equipped with a vacuum pump
  • the vacuum chamber 25 is defined by the partition wall 9 and end wall 10 and forms a part of said gas passage system.
  • the impeller 26 of the vacuum pump is mounted to said shaft 4 for rotation with the suspension impeller 12 and rotor 15 about the axis of rotation 5.
  • the vacuum chamber 25 is arranged eccentrically in relation to the impeller 26, the vacuum chamber 25 containing a liquid ring which thus has the same eccentricity as the chamber 25 in that the liquid ring slides along the cylindrical inner side 30 of the chamber.
  • the radial size of the liquid ring is adjusted such that its inner eccentric surface circumferentially lies completely within the span of the blades 27.
  • the outer ends of the blades 27 are thus located within the liquid ring.
  • Liquid for regulating the size of the liquid ring is supplied through a conduit 32. Since the liquid ring is eccentric in relation to the impeller 26, said blade pockets will gradually be enlarged on the suction side of the vacuum pump and gradually be decreased on its pressure side seen in the direction of rotation of the impeller.
  • Said annular passage 22 in the partition 9 opens into the vacuum chamber 25 through an arc-shaped gas inlet 35.
  • the vacuum chamber 25 communicates with a conduit 36 for removal of the gas evacuated from the centre of the suspension pump.
  • the conduit 36 which thus forms a part of said gas passage system, extends through the end wall 10 and includes an arc-shaped gas outlet 37 from the vacuum chamber 25.
  • the gas outlet 37 is thus arranged on the inside of the end wall 10 and is displaced substantially 180° in circumferential direction in relation to the gas inlet 35.
  • the gas inlet 35 and gas outlet 37 are arranged close to the hub 38 of the impeller 26, the gas inlet 35 becoming larger and the gas outlet 37 becoming narrower in circumferential direction in the direction of rotation of the impeller.
  • the radially outermost edge of the arc-shaped gas outlet 37 determines the size of the liquid ring. Excess liquid will therefore be pressed out through the gas outlet 37.
  • the pressure at the inlet to the pump will be correspondingly low (atmospheric pressure and below), so that large and varying quantities of air in the pulp will be separated in the pump and disturbing pumping.
  • the pressure at the centre of the impeller 12 is below atmospheric pressure and the air is evacuated by means of the vacuum pump 23. Since the quantities of air separated out vary from one time to another the pressure will also vary. In order to maintain constant pressure, therefore, make-up air is supplied via a passageway 39 provided with a pressure-sensitive valve 40 set at a predetermined under pressure, e.g. -0.4 bar.
  • the built-in vacuum pump is dimensioned for a capacity enabling it to evacuate the largest quantity of air that can be separated out of the pulp at low pressure.
  • the make-up air passageway 39 is arranged in the end wall 10 of the vacuum pump, extending only through the end wall 10 and opening directly into the vacuum chamber 25, the orifice part 41 of the make-up air passageway 39 thus being disposed radially inside the liquid ring and spaced circumferentially from the gas outlet 37 of the conduit 36, preferably substantially 180° therebetween.
  • the orifice part 41 is thus preferably disposed within the area formed by an axial projection of the opposite gas inlet 35 to the vacuum chamber 25.
  • the orifice part 41 may have the same arc-shaped extension as said gas inlet 35. Generally the area of the orifice part 41 shall be equal to or less than the area of the gas inlet 35.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Pompe servant à pomper la pâte cellulosique et comportant un carter principal (1); un arbre (4) monté rotatif dans ce carter; un rotor (15) monté sur l'arbre (4) et destiné à fluidifier la pâte; une roue hélice (12) montée sur l'arbre (4) et destinée à pomper la pâte; une pompe à vide (23) possédant un carter (24), une roue hélice (26) montée sur l'arbre (4), et une paroi terminale (10) du carter (24) de la pompe à vide, ladite paroi terminale et une cloison interne (9) délimitant ensemble une chambre à vide (25) dans laquelle tournent la roue hélice (26) de la pompe à vide et un volume annulaire de liquide; un système de conduits de gaz destinés à extraire les gaz dégagés par la pâte, et dotés, à proximité de la chambre à vide (25), de conduits de gaz (20, 21, 22, 36) situés dans la roue hélice (12), dans la cloison (9) et dans la paroi terminale (10); ainsi qu'un conduit d'admission d'air d'apport (39) servant à amener de l'air de l'extérieur lorsque le vide dépasse une valeur prédéterminée. Ledit conduit d'admission d'air d'apport (39) se situe dans ladite paroi terminale (10) de la pompe à vide (23), s'étend à travers cette paroi terminale (10) et directement jusqu'à ladite chambre à vide (25), et débouche dans celle-ci de manière radiale à l'intérieur du volume annulaire de liquide, tout en étant écarté dans le sens circonférentiel du conduit (36) d'évacuation de gaz vers l'extérieur de la pompe à partir de la chambre à vide (25).
PCT/SE1992/000828 1991-12-03 1992-11-30 Pompe incorporant une pompe a vide WO1993011359A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9103588-1 1991-12-03
SE9103588A SE468293C (sv) 1991-12-03 1991-12-03 Pump med inbyggd vakuumpump

Publications (1)

Publication Number Publication Date
WO1993011359A1 true WO1993011359A1 (fr) 1993-06-10

Family

ID=20384508

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1992/000828 WO1993011359A1 (fr) 1991-12-03 1992-11-30 Pompe incorporant une pompe a vide

Country Status (3)

Country Link
AU (1) AU3120793A (fr)
SE (1) SE468293C (fr)
WO (1) WO1993011359A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003014572A1 (fr) * 2001-08-08 2003-02-20 Metso Paper, Inc. Pompe a pate a papier

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE502127C2 (sv) * 1993-12-01 1995-08-28 Kvaerner Pulping Tech Anordning vid en vakuumpump för avluftning av suspensionspump

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4776758A (en) * 1987-07-06 1988-10-11 Kamyr Ab Combined fluidizing and vacuum pump
US4921400A (en) * 1987-07-06 1990-05-01 A. Ahlstrom Corporation Pump and a method of separating gas by such from a fluid to be pumped
US4981413A (en) * 1989-04-27 1991-01-01 Ahlstrom Corporation Pump for and method of separating gas from a fluid to be pumped
EP0474478A2 (fr) * 1990-09-07 1992-03-11 A. Ahlstrom Corporation Combinaison pompe centrifuge et pompe à vide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4776758A (en) * 1987-07-06 1988-10-11 Kamyr Ab Combined fluidizing and vacuum pump
US4921400A (en) * 1987-07-06 1990-05-01 A. Ahlstrom Corporation Pump and a method of separating gas by such from a fluid to be pumped
US4981413A (en) * 1989-04-27 1991-01-01 Ahlstrom Corporation Pump for and method of separating gas from a fluid to be pumped
EP0474478A2 (fr) * 1990-09-07 1992-03-11 A. Ahlstrom Corporation Combinaison pompe centrifuge et pompe à vide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003014572A1 (fr) * 2001-08-08 2003-02-20 Metso Paper, Inc. Pompe a pate a papier

Also Published As

Publication number Publication date
AU3120793A (en) 1993-06-28
SE9103588D0 (sv) 1991-12-03
SE468293C (sv) 1996-09-09
SE468293B (sv) 1992-12-07
SE9103588L (sv) 1992-12-07

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