• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a centrifugal pump for conveying a gas-containing suspension, in particular pulp suspension, with a pump impeller (12) having at least one opening (15) in the base plate, and ribs (16) on the rear side. It is characterized in that a Separatoreinheit (17) is provided, consisting of a Separatorgehäuse (25) with a fixed disc (18) and with the pump shaft (21) co-rotating disc (22), wherein the Separatoreinheit (17) in the pump housing in the axial direction on the pump impeller (12) seen after the pump impeller (12) is arranged on the rear side, wherein the separator housing (25) has a gas collecting chamber (31) with gas discharge line (28). As a result, the loss of substance can be reduced and a better pump stability of the centrifugal pump in the promotion of a gas-containing suspension, in particular pulp suspension, can be achieved.
    公开号:AT510538A1
    申请号:T1613/2010
    申请日:2010-09-27
    公开日:2012-04-15
    发明作者:Ludwig Dipl Ing Michal
    申请人:Andritz Ag Maschf；
    IPC主号:
    专利说明:

    ψ *
    The invention relates to a centrifugal pump for conveying a gas-containing suspension, in particular pulp suspension, with a pump impeller having at least one opening in the base plate, and ribs on the back, 5 Today's pumps for pumping medium-consistency pulp suspensions require a separation of the air for operation the pulp to ensure the pumpability. This is accomplished by first liquefying the pulp by applying shear forces (either by means of a "blender or fluidiser" mounted on the pump shaft or by an external device ("condenser"), thereby separating the air from the pulp is then removed from the pump with or without the aid of a vacuum pump, depending on the consistency and / or air content and flow of the pump, fiber losses occur via the degassing line To solve this problem or at least to reduce it, comparatively complex control systems are used Such a system is known, for example, from US 5 087 171. These systems require a great deal of construction work, and a great deal of effort is also required for setting the control loops, which have to be tuned from plant to plant for different substance types. In addition, the existing systems are not 20 Reliable enough to prevent fiber loss altogether. Fiber losses can cause problems with pump stability in addition to the loss of pulp.
    The aim of the present invention is to eliminate these problems.
    The invention is therefore characterized in that a Separatoreinheit 25 is provided, consisting of a Separatorgehäuse with a fixed disc and a co-rotating with the pump shaft pulley, the separator unit is arranged in the pump housing in the axial direction of the impeller then arranged on the pump impeller on the back wherein the separator housing has a gas collection chamber with gas discharge line 30. As a result, the loss of material can be reduced and better pump stability can be achieved.
    An advantageous development of the invention is characterized in that the fixed disc is provided with ribs (Lertschaufeln), wherein the 2593-AT 1 27/03 2010 MO 14:33 [SE / EM NR 5579] @ 004 fixed disc on the pump impeller facing side may have a smooth surface and the ribs are arranged on the opposite side. The ribs or guide vanes can be arranged radially or else at any angle and designed to be straight or curved.
    A favorable embodiment of the invention is characterized in that the disk co-rotating with the pump shaft is provided with ribs (vanes), whereby the disk co-rotating with the pump shaft can have a smooth surface on the side facing the fixed disk and the ribs on the opposite side are arranged. Again, the ribs or vanes can be arranged radially or at any angle and be executed straight or curved. This achieves a further reduction of the substance loss.
    A particularly advantageous embodiment of the invention is characterized in that the co-rotating with the pump shaft pulley has a closed surface without openings. This offers the advantage that virtually no loss of substance is present and the pump stability is given.
    An advantageous embodiment of the invention is characterized in that an opening for rinsing water is provided in the separator housing, which is in communication with the channel formed by the ribs of the co-rotating disk. In this case, the pressed into the degassing pulp is conveyed back by means of Separatorlaufrad in the pump and the air can escape against the pumping action of the separator from the pump.
    A favorable embodiment of the invention is characterized in that an opening for rinsing water is provided in the housing, which communicates with the channel formed by the ribs of the co-rotating disc.
    If the pump impeller is preceded by a fluidizer, which may be designed as a rotor connected to the pump shaft or may be provided as a rotor arranged separately from the pump shaft, then the pulp suspension is liquefied in a simple manner and the air is separated from the substance. The pulp enters the pump impeller, where the vast majority of pulp is pumped into the volute casing. The part of the pulp mixture (fiber suspension with air) which is pressed through degassing holes in the pump impeller passes through the 2593-AT 2 27/09 2010 MD 14:33 [SE / EM NR 5579] @ 005
    Degassing holes in the pump impeller and by backflow in Pumpenlaufradrückenraum to the degassing chamber or in the Separatorraum.
    The invention will now be described by way of example with reference to the drawings, in which:
    1 shows a system for conveying a gashaltigen suspension according to the prior art 5,
    2 shows a variant of a centrifugal pump according to the invention,
    Fig. 3 shows a section along the line III-III in Fig. 2 represents.
    Fig. 1 shows a system for conveying gaseous suspensions with 10 degassing device according to the prior art. The centrifugal pump 1 is here mounted in the lower part of a standpipe 2 which extends below a larger container 3, e.g. Bleaching tower or similar located. The pump 1 has an outlet conduit 4 for the medium to be pumped, e.g. Pulp suspension and at the inlet to a rotor 5, which is completely in the standpipe 2 and in conjunction with 15 of the wall of the standpipe 2 generate turbulence, which lead to fluidization of the pulp suspension. In the outlet line 4 is a regulating valve 6, which is connected to a control unit 7.
    Furthermore, the pump 1 has a gas discharge line 8, in which a regulating valve 9 and a vacuum pump 10 are arranged. The control unit 7 controls the amount 20 in the outlet line 4 through the Regelventi! 6 and in particular the control valve 9 in the gas discharge line 8. If the height of the suspension in the container 3 and standpipe 2, measured by the pressure sensor 11 at the lower end of the standpipe 2, is too high and thus there is a risk that suspension in the gas discharge line. 8 The control unit 7 closes the regulating valve 9. This system essentially allows gas to be sufficiently separated during startup and shutdown of the system.
    Fig. 2 shows a section through a centrifugal pump 1 according to the invention with a pump impeller 12 and integrated thereon fluidizer 13. In the impeller 12 are located near the axis 14 openings 15 for the removal of gas, which has collected at 30 fluidizer. Ribs 16 are located on the back side of the pump impeller 12. The rotation of the pump impeller 12 causes fibers and liquids to pass through the ribs 16 in the gas / liquid stream passing through the apertures 15. SE / EM NR 5579] @ 006
    Fluid pumped back into the pump room. To the pump impeller then connects to a Separatoreinheit 17. This has a fixed stator plate 18, with fixed blades or ribs 19, which has on the pump impeller 12 side facing a smooth surface 20, wherein one or more stationary vanes or ribs 19 are arranged on the opposite side and these radially or in arranged at any angle, can be made straight or curved. In addition, the inner diameter of the stator plate 18 is greater than the inner diameter of the ribs 19 of the fixed disc 18 in this area to ensure an open passage for the air / pulp suspension. This clearance can also be beschaufeit by-up to just outside the outer diameter of the pump shaft projecting blades of the stator plate 18. In addition to the stator plate 18 sits a fixedly connected to the pump shaft and rotating at the same speed disc 22 as a rotating Separatorlaufrad 22. This Separatorlaufrad 22 has on the stator plate 18 side facing a smooth surface 23 and has on the stator 18 side facing away from or a plurality of vanes or ribs 24. This rotating disc 22 is smaller in diameter than the inner diameter of the separator housing 25 and forms between its outer periphery and the separator housing 25 has a gap 26 to ensure a flow of air and also of the fibers. This rotating disk 22 has a closed surface without openings. To prevent clogging of the separator unit 17, rinse water can be introduced through an opening 27.
    In centrifugal pumps for gas suspensions, e.g. Depending on the flow rate and consistency of the pulp, MC pumps are forced through the openings 15 into the degassing chamber or, in the present case, into the separator unit 17. This fibrous material is conveyed back into the pump by the separator impeller 22 with the aid of the blades 24. In operating areas in which no or little fibrous material is pressed into the separator unit 17 or the degassing chamber, more or less air is forced through the separator unit 17, depending on the amount of air separated. This air is removed via a bore 28 on the side facing away from the Separatorlaufrad 22 with or without the aid of a vacuum pump from the pump. By the separator unit 17 according to the invention thus takes place a permanent pumping back of fibers without hindering the outflowing air. Due to the fact that the 2593-AT 4 27/09 2010 MO 14:33 [SE / EH MR 5573] @ 007 · «* · ·« «« · · · · · · · · · · ··· · · · · · · · · · · »» II ·
    Separator runner 22 has a closed surface without openings, the leakage of fibers is prevented.
    The separator housing 25 forms with the pump shaft 21, the gas collecting chamber 31 and includes the gas discharge opening (26) and the line 27 for rinsing water. The separated gas, in particular the separated air, flows from the rear side of the pump impeller 12 through the channels formed by the ribs 19 of the stationary disk 18, subsequently passes through the gap 26 into the channels formed by the ribs 24 of the rotating disk 22 in the gas collection chamber 31 and is discharged from there via the gas discharge line with or without 10 additional vacuum pump from the centrifugal pump 1.
    Fig. 3 shows a section through the centrifugal pump according to the invention along the line ΙΙΙΊΙΙ in Fig. 2. It can be seen here the shaft 21 and the rotating disc 22 with the ribs 24, which are designed here as straight ribs. Furthermore, the ribs 19 of the fixed disc 18 can be seen, which are shown here by way of example 15 bent. However, the ribs 19 of the fixed disc 18 as well as the ribs 24 of the rotating disc 22 can be made both straight or curved. Furthermore, in Fig. 3, the gap 26 between the rotating disk 22 and the housing 25 can be seen. Also, the annular space 29 can be seen, which is located between the fixed disc 18 and the pump shaft 21 20 and passes through the gas-liquid mixture in the separator 17. i 5
    2593-AT
    权利要求:
    Claims (4)
    [1]
    Claims 1. A centrifugal pump for conveying a gas-containing suspension, in particular pulp suspension, with a pump impeller (12) having at least one opening (15) in the base plate and ribs (16) at the rear side thereof, characterized in that a Separatoreinheit (17) is provided, consisting of a Separatorgehäuse (25) with a fixed disc (18) and with the pump shaft (21) co-rotating disc (22), wherein the separator unit (17) in the pump housing in the axial direction the centrifugal pump according to claim 1, characterized in that the fixed disc (18) is provided with ribs (19). 3. Centrifugal pump according to claim 2, characterized in that the fixed disc (18) on the pump impeller (12) side facing a giatte surface (20) and the ribs (19) are arranged on the opposite side, after 4. centrifugal pump Claim 1 or 2, characterized in that the with the pump shaft (21) co-rotating disc (22) is provided with ribs (24). 5. Centrifugal pump according to claim 4, characterized in that with the pump shaft (21) co-rotating disc (22) on the fixed disc (18) side facing a smooth surface (23) and the ribs (24) on the opposite side are arranged. 6. centrifugal pump, according to one of claims 1 to 5, characterized in that the Pumpenwelie (21) co-rotating disc (22) has a closed surface (23) without openings. 7. Centrifugal pump according to claim 4 to 6, characterized in that in the separator housing (25) has an opening (27) is provided for rinse water, the 2593ΆΤ 6 27/03 2010 MO 14:33 [SE / EM NR 5579] @ 003 J. u -L *. u g Γ Λ.Χ oxu uau ^. Λ1> 1> Μ 1L ϊ Λ1 £ 11 1 tj u i. Is connected to the channel formed by the ribs (24) of the co-rotating disk (22).
    [2]
    8. Centrifugal pump according to one of claims 1 to 7, characterized in that the pump impeller (12) is preceded by a fluidizer.
    [3]
    9. Centrifugal pump according to claim 8, characterized in that the fluidizer is provided as with the Pumpenweiie (21) connected rotor.
    [4]
    10. Centrifugal pump according to claim 8, characterized in that the fluidizer is provided as from the pump line (21) separately arranged rotor. 7 2593-AT 2 7/03 20 10 MO 14:33 JSE / EM HR 5573] @ 010
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1995015439A1|1993-12-01|1995-06-08|Kvaerner Pulping Technologies Ab|A device in a vacuum pump|
    WO1999066209A1|1998-06-17|1999-12-23|Valmet Fibertech Ab|Pulp pump|
    WO2000043677A1|1998-12-30|2000-07-27|Sulzer Pumpen Ag|Method and apparatus for pumping a material and a rotor for use in connection therewith|
    EP1736218A1|2005-06-22|2006-12-27|Sulzer Pumpen Ag|A gas separation apparatus, a front wall and a separation rotor thereof|
    SU558691A1|1975-11-27|1977-05-25|Всесоюзный Научно-Исследовательский Биотехнический Институт|Separation device|
    FI89516B|1989-05-10|1993-06-30|Ahlstroem Oy|Foerfarande Foer blekning av cellulosamassa med Otson|
    US5087171A|1989-07-25|1992-02-11|Goulds Pumps, Incorporated|Paper pulp centrifugal pump with gas separation|
    US4936744A|1989-07-25|1990-06-26|Goulds Pumps, Incorporated|Centrifugal pump|
    US5151010A|1990-09-07|1992-09-29|A. Ahlstrom Corporation|Combined centrifugal and vacuum pump|
    US5116198A|1990-09-07|1992-05-26|Ahlstrom Corporation|Centrifugal pumping apparatus|
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    AT510538B1|2010-09-27|2013-02-15|Andritz Ag Maschf|CENTRIFUGAL PUMP|AT510538B1|2010-09-27|2013-02-15|Andritz Ag Maschf|CENTRIFUGAL PUMP|
    JP6088918B2|2013-06-28|2017-03-01|株式会社丸八ポンプ製作所|Centrifugal pump|
    CN104373362A|2013-08-12|2015-02-25|苏州维艾普新材料股份有限公司|Planar draw-off equipment for materials|
    EP2894342B1|2014-01-12|2016-12-28|Alfa Laval Corporate AB|Self-priming centrifugal pump|
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