EP1705380A1 - Pompe pour matière épaisse - Google Patents

Pompe pour matière épaisse Download PDF

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Publication number
EP1705380A1
EP1705380A1 EP06111998A EP06111998A EP1705380A1 EP 1705380 A1 EP1705380 A1 EP 1705380A1 EP 06111998 A EP06111998 A EP 06111998A EP 06111998 A EP06111998 A EP 06111998A EP 1705380 A1 EP1705380 A1 EP 1705380A1
Authority
EP
European Patent Office
Prior art keywords
bearing
locating
slurry pump
bearings
spherical roller
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Withdrawn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
EP06111998A
Other languages
German (de)
English (en)
Inventor
Magnus Arvidsson
Håkan Leander
Sandro Chervatin
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.)
SKF AB
Original Assignee
SKF AB
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 SKF AB filed Critical SKF AB
Priority to EP06111998A priority Critical patent/EP1705380A1/fr
Publication of EP1705380A1 publication Critical patent/EP1705380A1/fr
Withdrawn legal-status Critical Current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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/049—Roller bearings

Definitions

  • Pumps used for different purposes such as mining, mineral processing, oil sand transport, waste water treatment and transport of catalysts in petrochemical processes are in most instances known as slurry pumps.
  • Slurry pumps for such purposes are mostly horizontal centrifugal pumps, designed to operate under heavy-duty conditions handling non-homogenous fluids with solids and hard particles mixed to water or low viscosity fluids. These operating conditions mean that the pump is subjected to a progressive abrasive wear acting on the pump impeller when the hard particles in the fluid transported by means of the slurry pump hit and slide on the blades of the impeller, and also to cavitation. As a result of such wear and cavitation there is generated strong vibrations, irregular loads and permanent shaft deflections, which all can cause early bearing failure.
  • the purpose of the present invention is to propose a self-aligning slurry pump of the type described intended to increase the mean time between failures and enhancing reliability by minimizing the effects of cavitation and impeller wear, and this has been achieved in that the slurry pump has been given a system of solutions defined in the accompanying claim 1.
  • Fig. 1 shows in a cross-section a portion of a slurry pump 1 according to the present invention, and which is intended for light duty applications.
  • the pump 1 has an impeller 2, which is mounted on a shaft 3 driven by an electric motor (not shown) either directly or via a belt.
  • the shaft is commonly supported in radial rolling bearings and at least one thrust bearing to accommodate the relevant axial loads generated by the action of the fluid on the impeller.
  • the bearings are situated in a closed housing 4 with sealing arrangements 5, 6 for the shaft passing therethrough.
  • the impeller 2 is situated in a separate housing 7 and the bearing housing 4 and the impeller housing 7 are connected to each other by means of bolt connections 8, but are individually sealed off.
  • the bearings used in this embodiment is a pair of angular contact ball bearings 9, which are mounted in back-to-back arrangement as locating bearings, and a toroidal roller bearing 10 mounted as a non-locating bearing.
  • Such a bearing combination will give a high resistance to axial shock loads by means of the angular contact ball bearings 9, and the non-locating toroidal roller bearing 10 will give smaller unbalance and a cooler pump, as it can take up axial displacements and also accommodate angular misalignments.
  • a heavy duty slurry pump 11 incorporating an impeller 12, which is operatively connected to a shaft 13, supported in a housing 14, which is sealed off from the exterior by means of radial oil seals 15 and 16.
  • the impeller 12 is positioned in a housing 17, separate from and sealed off from the bearing housing 14, but being connected thereto by bolt connections 18.
  • the shaft 13 On the "dry side", i .e. near the end facing away from the impeller 12, the shaft 13 is supported in a double-row spherical roller bearing 19 positioned as a locating bearing. This bearing is self-aligning and this means that the pump will be insensitive to shaft bending, and the accuracy on surrounding components is therefore less important.
  • this bearing 19 has a certain ability of accommodating axial loads in both directions.
  • a spherical roller thrust bearing 20 adjacent the spherical roller bearing 19 at the "dry side”.
  • this spherical roller thrust bearing 20 is arranged as a locating bearing.
  • the shaft 13 is supported in a non-locating toroidal roller bearing 21, which has an ability to take up axial displacements and also accommodate angular misalignments.
  • toroidal roller bearing 10, 21 as a non-locating or floating bearing in both the embodiments described above, means that the bearing will move when temperature and/or axial load increases, but it will move first when the friction force is overcome, which in the art is referred to as stick-slip. Such ability of movement will reduce the influence of friction, as the internal axial load is released at each movement, and the temperature reduction in turn will again cause reduction of the axial load.
  • the non-locating toroidal roller bearing thus will guarantee a frictionless axial movement, no possibilities to create internal axial forces, and the stress will be minimized and the bearing performance will be improved, which again will give improved reliability, predicted service life and possibility of down-sizing the components.
  • the non-locating toroidal bearing 10, 21 has preferably a taper bore and is mounted on an adapter sleeve, which means that the mounting and dismounting of the bearing is facilitated.
  • Fig. 3 the heavy duty pump of Fig. 2 is shown in bigger scale and with specific functions of different parts of the bearing system illustrated in enlarged, encircled part views.
  • the toroidal roller bearing 21 is shown in a first position 21' where the outer ring has been axially displaced in relation to the inner ring, and in a second position 21" in which it is illustrated how the inner ring and the outer ring are axially displaced relative to each other and also angularly inclined to each other.
  • the lower, left hand circle illustrates the relation between the two row spherical roller bearing 19 and the spherical roller thrust bearing 20, and this illustration shows that the load center line 19a of the spherical roller bearing 19 and the load center lines 20a and 20b of the spherical roller thrust bearing 20 all meet in a common point X on the geometrical axis 13a of the shaft 13.
  • toroidal bearing 10, 21 as a non-locating bearing it is possible to accommodate a misalignment of 0.5° and an axial displacement of +/- 10% of the bearing width.
  • adapter sleeves entails a lower risk for incorrect mounting.
  • the slurry pumps according to the invention can preferably be equipped with a condition monitoring system adapted to sense the conditions related to low frequency vibrations in connection to impeller abrasive wear and also very high frequency vibrations caused by cavitation by means of vibration/temperature sensors, transmitting signals representative for such conditions to a display, to an alarm module or the like.
  • a condition monitoring system adapted to sense the conditions related to low frequency vibrations in connection to impeller abrasive wear and also very high frequency vibrations caused by cavitation by means of vibration/temperature sensors, transmitting signals representative for such conditions to a display, to an alarm module or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP06111998A 2006-03-30 2006-03-30 Pompe pour matière épaisse Withdrawn EP1705380A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06111998A EP1705380A1 (fr) 2006-03-30 2006-03-30 Pompe pour matière épaisse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06111998A EP1705380A1 (fr) 2006-03-30 2006-03-30 Pompe pour matière épaisse

Publications (1)

Publication Number Publication Date
EP1705380A1 true EP1705380A1 (fr) 2006-09-27

Family

ID=36423629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06111998A Withdrawn EP1705380A1 (fr) 2006-03-30 2006-03-30 Pompe pour matière épaisse

Country Status (1)

Country Link
EP (1) EP1705380A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2643594B1 (fr) 2010-11-28 2017-03-08 Harry Højvang Sørensen Pompe de pompage de liquides contenant des solides
CN114837955A (zh) * 2022-05-23 2022-08-02 山东省章丘鼓风机股份有限公司 一种渣浆泵密封泄漏监测装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
SKF - G BERG/CARB TEAM, COST SAVING POTENTIAL IN SLURRY PUMPS, 9 October 2001 (2001-10-09), pages 1 - 3, XP002383172, Retrieved from the Internet <URL:http://www.skf.com/files/004276.pdf> [retrieved on 20060530] *
SKF - PUBLICATION 4815 E, THE BETTER SOLUTION FOR PULP AND PAPER MACHINERY, 1999, pages 1 - 4, XP002383174, Retrieved from the Internet <URL:http://www.skf.com/files/058929.pdf> [retrieved on 20060530] *
SKF - PUBLICATION 5102 E, CARB TOROIDAL ROLLER BEARINGS, January 2004 (2004-01-01), pages 1 - 84, XP002383173, Retrieved from the Internet <URL:http://www.skf.com/files/151319.pdf> [retrieved on 20060530] *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2643594B1 (fr) 2010-11-28 2017-03-08 Harry Højvang Sørensen Pompe de pompage de liquides contenant des solides
CN114837955A (zh) * 2022-05-23 2022-08-02 山东省章丘鼓风机股份有限公司 一种渣浆泵密封泄漏监测装置
CN114837955B (zh) * 2022-05-23 2023-12-05 山东省章丘鼓风机股份有限公司 一种渣浆泵密封泄漏监测装置

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