EP0600821A1 - Betrieb einer mehrstufige Propellerpumpe für Fasersuspensionskonzentrate und insbesondere diesem Betrieb angepasste Propellerpumpe - Google Patents

Betrieb einer mehrstufige Propellerpumpe für Fasersuspensionskonzentrate und insbesondere diesem Betrieb angepasste Propellerpumpe Download PDF

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Publication number
EP0600821A1
EP0600821A1 EP93490024A EP93490024A EP0600821A1 EP 0600821 A1 EP0600821 A1 EP 0600821A1 EP 93490024 A EP93490024 A EP 93490024A EP 93490024 A EP93490024 A EP 93490024A EP 0600821 A1 EP0600821 A1 EP 0600821A1
Authority
EP
European Patent Office
Prior art keywords
pump
propeller
stage
gas
hollow
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.)
Withdrawn
Application number
EP93490024A
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English (en)
French (fr)
Inventor
Michel Georges
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.)
F Moret (sa) Ets
Original Assignee
F Moret (sa) Ets
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 F Moret (sa) Ets filed Critical F Moret (sa) Ets
Publication of EP0600821A1 publication Critical patent/EP0600821A1/de
Withdrawn legal-status Critical Current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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/688—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D31/00—Pumping liquids and elastic fluids at the same time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts

Definitions

  • the present invention relates to the pumping of fibrous suspensions such as are encountered in particular in the paper industry and in particular concentrated suspensions, comprising at least 8% by weight of fibers.
  • centrifugal pumps As regards fibrous suspensions, the preparation of which was made without special precautions, it is accepted that conventional centrifugal pumps can be used up to concentrations of the order of 4 to 5% by weight of fibers.
  • the aim set by the applicant is to alleviate the drawbacks noted by proposing a pumping device which makes it possible to transport fibrous suspensions with a concentration of at least 8% fiber, without calling for special precautions during the preliminary operations. of preparation.
  • the applicant had the idea of using a propeller pump with at least three stages and noted that contrary to all expectations, the use of such a propeller pump made it possible to transfer by fibrous suspensions, containing gas and comprising at least 8% by weight of fibers, with pump characteristics at least equivalent to those of a centrifugal pump used under the same conditions to transport fibrous suspensions of 4 to 5% by weight of fibers.
  • Each stage consists of a vane rotor, rotatably mounted on an axial shaft, and a fixed stator playing the role rectifier. It is understood that the succession on the axial shaft of the stators and rotors leads to a very large size of this pump. This is its main drawback which makes that with equal dimensions, a multistage propeller pump develops much less pressure than a centrifugal pump.
  • this type of pump is used mainly when it is desired to place it in a space which is reduced diametrically.
  • the applicant was able to verify that the volume of the gas pocket which is created on the first floor is greater than that which is created on the second and which itself is greater than that which is created on the third floor. This degression of the gas pocket volume must be a function of the correlative evolution of the compression inside the pump.
  • This pump comprises in known manner at least three stages each composed of a rotary propeller, mounted around an axial shaft and a fixed rectifier.
  • each blade of the propeller is hollowed out with a recess in the upper surface of the blade. This arrangement concerns at least the first stage of the pump.
  • the axial shaft supporting the propellers is hollow, the blades of the propeller located at least on the first stage are provided on their upper surfaces with discharge orifices and the propeller pump is equipped with a device gas withdrawal which is connected to said orifices via the hollow shaft.
  • each blade is hollow with a suction chamber opening on the one hand into the interior recess of the hollow shaft and on the other hand into the orifices made on the upper surface. It is thus possible to have a multiplicity of orifices over the entire peripheral zone of the upper surface of the blade, said orifices communicating with the suction chamber located inside the blade. Thanks to this multiplicity, it is ensured to obtain the evacuation of the gas pocket.
  • the propeller pump 1 which is represented in FIG. 1 is a four-stage pump 2,3,4,5.
  • This term stage designates the succession on the shaft 6 of the pump 1 of two elements, namely on the one hand a propeller 7 which is fixed to the shaft 6 and which is therefore rotary, at the same time as this shaft 6 and on the other hand a rectifier 8 which is fixed to the external and cylindrical body 9 of the front part 10 of the pump 1.
  • the propellers 7 comprise blades 11, arranged in a conventional manner according to the configuration illustrated in FIG. 5.
  • the front part 10 of the pump which constitutes the active part thereof, opens into an elbow 12 for discharging the transported liquid.
  • the shaft 6 is cantilevered on a bearing 13 and is driven in rotation by the motor 14.
  • FIG. 1 shows in the form of two arrows F the direction of circulation of the liquid conveyed by such a pump 1.
  • the drawback of the multi-stage propeller pump consists in its axial size due to the succession of propellers and rectifiers along the shaft and to the presence of the elbow 12 d 'evacuation.
  • the centrifugal pump in the case of a centrifugal pump there is only one impeller and the discharge elbow is replaced by a volute arranged annularly with respect to the wheel.
  • the centrifugal pump develops much more pressure than the propeller pump described above.
  • the applicant had the idea of implementing such a propeller pump for the transfer of charged liquids containing gas, and in particular but not limited to fibrous suspensions, in particular in the field of stationery.
  • the fibers in suspension are hydrophilic fibers which, in addition, have the capacity to retain gas in a large proportion. This is obtained in particular during the dilution of the paper pulp, carried out in kneaders.
  • the paper pulp is added to water and subjected to intense mechanical agitation during which a mixture of air and water is formed: a good part of this air is retained by the fibers in suspension.
  • a defusing of the centrifugal pump used for the transport of such suspensions can occur for slightly concentrated suspensions, for example not containing by weight only 4% fiber.
  • the applicant sought the means to pump charged liquids containing a high proportion of gases, in particular concentrated fibrous suspensions, without having to take any special precautions in terms of the preparation of the liquid and if possible without having to modify the pumping means. .
  • the applicant has produced experimental equipment in which the body 9 supporting the rectifiers 8 as well as the outer casing 16 of the front part 10 of the pump 1 is made of a transparent material. This arrangement made it possible to visualize the formation of gas pockets, as a function of the concentrations of the fibrous suspensions conveyed by the pump.
  • the maximum admissible concentration corresponds to that for which one arrives at the formation of such a gas pocket on the upper surface of the blades of the top stage, before the pump is deactivated.
  • the applicant has modified it using a gas withdrawal system.
  • the peculiarity of this system is to come and sample the gas at the place where the stable pocket of gas is formed, that is to say on the upper surface of the propeller blades, at least on the one located at the first stage of the pump 1.
  • the shaft 6 is hollow, it has an internal recess 18 which is connected, beyond the discharge elbow 12 and in a sealed manner, to a vacuum pump or to a ejector not shown.
  • FIG. 3 shows an embodiment of the sealed connection system between the recess of the shaft 6 and the actual suction device.
  • the shaft 6 is surrounded by a stuffing box 19, delimiting on the one hand an internal housing 20 inside which are placed sealing braids 21 on either side of a chamber 22.
  • This annular chamber 22 is connected by a connection orifice 23 to the vacuum pump or to the not shown ejector.
  • the shaft 6, in line with the chamber 22, is pierced by several radial holes 24 which open into the central recess 18 of the shaft 6.
  • each of the blades 11 of the propeller 7 is modified so as to be able to evacuate towards the internal recess 18 of the shaft 6 the gas pocket which forms on the upper surface 17 of said blade 11.
  • the blade 11 is hollow and contains an interior chamber 26.
  • This chamber 26 gives on the one hand on the interior recess 18 of the shaft 6 by means of pipes 27 and on the other hand overlooks the 'upper surface 17 of the blade 11 by means of multiple perforations 28.
  • the blade is hollowed out with a recess 29 made in the upper surface 30, as shown for the blade 11 'in FIG. 2.
  • This recess practiced along the leading edge 31 of the blade constitutes a recess 32 which delimits the hollow part 33 in the upper surface 30.
  • This hollow part 33 in a way creates an open chamber formed in the upper surface.
  • the gas pocket which forms on the upper surface is preferably housed along the recess 29 inside the hollow part 33.
  • the hollow part 33 is connected to the internal recess 18 of the axis 6 by a pipe 34.
  • a pipe 34 it is possible to suck up the gas pocket formed in this part in hollow 33 using the gas withdrawal system fitted to pump 1.
  • the invention is not limited to the pumping of concentrated fibrous suspensions; it can also be applied for pumping other charged liquids containing a large amount of gas, for example emulsions in the food industry.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP93490024A 1992-12-04 1993-11-30 Betrieb einer mehrstufige Propellerpumpe für Fasersuspensionskonzentrate und insbesondere diesem Betrieb angepasste Propellerpumpe Withdrawn EP0600821A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9214871A FR2698918B1 (fr) 1992-12-04 1992-12-04 Utilisation d'une pompe hélice multiétage pour le pompage de suspensions fibreuses concentrées et pompe hélice spécialement adaptée pour cette utilisation.
FR9214871 1992-12-04

Publications (1)

Publication Number Publication Date
EP0600821A1 true EP0600821A1 (de) 1994-06-08

Family

ID=9436413

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93490024A Withdrawn EP0600821A1 (de) 1992-12-04 1993-11-30 Betrieb einer mehrstufige Propellerpumpe für Fasersuspensionskonzentrate und insbesondere diesem Betrieb angepasste Propellerpumpe

Country Status (2)

Country Link
EP (1) EP0600821A1 (de)
FR (1) FR2698918B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170037854A1 (en) * 2015-08-05 2017-02-09 Wade Spicer Magnetic drive, seal-less pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1554472A (en) * 1919-11-22 1925-09-22 Firm Aktieselskabet Hydropeat Apparatus for treatment of peat mass and production of peat fuel
US3027845A (en) * 1959-11-16 1962-04-03 Worthington Corp Impeller tip pocket
FR2479870A1 (fr) * 1980-04-07 1981-10-09 Ahlstroem Oy Dispositif et procede pour separer un gaz d'une suspension de fibres
EP0298693A2 (de) * 1987-07-06 1989-01-11 Kvaerner Pulping Technologies AB Selbsteinspeisende Pumpe
EP0409456A2 (de) * 1989-07-18 1991-01-23 Kamyr Ab Pumpe mit getrennter, an das Laufrad angrenzender Wirbelflügelwelle
US5087171A (en) * 1989-07-25 1992-02-11 Goulds Pumps, Incorporated Paper pulp centrifugal pump with gas separation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1554472A (en) * 1919-11-22 1925-09-22 Firm Aktieselskabet Hydropeat Apparatus for treatment of peat mass and production of peat fuel
US3027845A (en) * 1959-11-16 1962-04-03 Worthington Corp Impeller tip pocket
FR2479870A1 (fr) * 1980-04-07 1981-10-09 Ahlstroem Oy Dispositif et procede pour separer un gaz d'une suspension de fibres
EP0298693A2 (de) * 1987-07-06 1989-01-11 Kvaerner Pulping Technologies AB Selbsteinspeisende Pumpe
EP0409456A2 (de) * 1989-07-18 1991-01-23 Kamyr Ab Pumpe mit getrennter, an das Laufrad angrenzender Wirbelflügelwelle
US5087171A (en) * 1989-07-25 1992-02-11 Goulds Pumps, Incorporated Paper pulp centrifugal pump with gas separation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170037854A1 (en) * 2015-08-05 2017-02-09 Wade Spicer Magnetic drive, seal-less pump

Also Published As

Publication number Publication date
FR2698918A1 (fr) 1994-06-10
FR2698918B1 (fr) 1995-03-03

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