EP0947701A1 - Pompe centrifuge à plusieurs étages - Google Patents

Pompe centrifuge à plusieurs étages Download PDF

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Publication number
EP0947701A1
EP0947701A1 EP98810274A EP98810274A EP0947701A1 EP 0947701 A1 EP0947701 A1 EP 0947701A1 EP 98810274 A EP98810274 A EP 98810274A EP 98810274 A EP98810274 A EP 98810274A EP 0947701 A1 EP0947701 A1 EP 0947701A1
Authority
EP
European Patent Office
Prior art keywords
hollow shaft
drive shaft
centrifugal pump
speed
shaft
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
EP98810274A
Other languages
German (de)
English (en)
Other versions
EP0947701B1 (fr
Inventor
Siegfried Liegat
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.)
Sulzer Pumpen Deutschland GmbH
Original Assignee
Sulzer Weise GmbH
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 Sulzer Weise GmbH filed Critical Sulzer Weise GmbH
Priority to EP98810274A priority Critical patent/EP0947701B1/fr
Priority to DE59812247T priority patent/DE59812247D1/de
Priority to US09/273,400 priority patent/US6179553B1/en
Publication of EP0947701A1 publication Critical patent/EP0947701A1/fr
Application granted granted Critical
Publication of EP0947701B1 publication Critical patent/EP0947701B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2277—Rotors specially for centrifugal pumps with special measures for increasing NPSH or dealing with liquids near boiling-point
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage 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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/028—Units comprising pumps and their driving means the driving means being a planetary gear
    • 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
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

Definitions

  • the invention is a multi-stage Centrifugal pump for liquids with several on one Shaft impellers arranged in a pump housing rotate.
  • Multi-stage centrifugal pumps are used when you want to generate a high pressure drop and the required flow rates or the type of medium are such that volumetric pumps are out of the question.
  • the flow rate is not greater than the permissible NPSH R value of the pump based on the pump characteristics.
  • the value of a pump therefore depends largely on the fact that its NPSH R value is as low as possible, so that the plant manufacturer is not faced with unreasonable requirements due to the inlet height.
  • the object of the invention is to modify a multi-stage pump in such a way that it can be operated at low NPSH A values of a system permissible characteristic range.
  • At least one impeller is mounted as a hollow shaft on the drive shaft and rotates at a speed n 2 different from the speed n 1 of the drive shaft, the hollow shaft being driven by a mechanical converter, the mechanical power decreases from the drive shaft in the housing and at this different speed n 2 to the hollow shaft, such that the speed of the first impeller is the lower to produce a low NPSH R value for the multi-stage pump.
  • the first impeller As a hollow shaft mounted on the drive shaft and to drive the first impeller with the mechanical converter at a lower speed n 2 ⁇ n 1 .
  • the mechanical converter can also be designed as a torque converter with slip, similar to a fluid coupling. It is also conceivable to additionally install a turbine wheel on the hollow shaft and to feed it with a partial flow from a later stage and to add this partial flow to the flow on the suction side.
  • Another advantage is that the improved Absorbency with a small enlargement of the Construction volume is bought. In addition, none Feed pump necessary. Another advantage results for condensate pumps. When built vertically they are ordinary at a low speed run, which requires more levels to get to the predetermined final pressure to come. By the proposed These pumps can be improved with fewer stages and shorter installation depth, which is significant Saving construction costs. In addition, these measures are also effective for horizontally arranged pumps.
  • the impeller of the first stage is designed as a hollow shaft which is rotatably mounted on the drive shaft. With the rotation of the drive shaft, mechanical work is delivered to a mechanical converter, which delivers a torque at a speed n 2 lower than the speed n 1 of the drive shaft to the hollow shaft, due to the lower speed n 2, a lower entry acceleration of the incoming liquid and a generate a lower NPSH R value for the multi-stage pump. It is understood that, for reasons of continuity, the flow cross-sections in the first impeller should be chosen larger if its speed is lower than that of the following impellers in order to achieve the same delivery range as in the high-speed stages.
  • FIGs 1a, 1b are idlers 3, which the Liquid to a subsequent stage redirect, in a pump housing 1, 1a, 2 summarized.
  • the associated wheels 9, 4 are on the drive shaft 5 positioned, the impeller 9 of the first stage as a ring gear 6 on the drive shaft 5 with Bearings 10 is rotatably mounted.
  • the ring gear 6 extends in axial direction via an inlet spiral on the Suction side and is above dynamic shaft seals 12 against the housing 1a and against the shaft 5 sealed. Behind the shaft seals 12 is a Planetary gear 16 integrated into the pump housing 1a.
  • the space from the planetary gear 16 has an oil filling which is sealed off from the delivery liquid via the shaft seals 12.
  • a planet carrier 20 is fixed as a ring on the hollow shaft 6 and carries with planet pins 31 the planet gears 19 which engage on the outside in an outer ring 18a connected to the housing and on the inside in a sun gear 17. This results in a reduced speed n 2 for the first impeller 9, which is less than half the speed n 1 of the drive shaft 5.
  • the exact speed ratio is adapted to the optimal operating conditions by dimensioning the diameters of sun and planet gears.
  • the drive shaft 5 is supported on the suction side in its axis 32 with a roller bearing 11 on the housing cover 8.
  • the impellers 4 after the 1st stage and the sun gear 17 are positively connected to the shaft 5 by means of a key 33.
  • the housing parts 1, 1a, 2, 8 are sealed to one another via static seals 13.
  • the housing cover 8 also serves as a planet carrier 20a, which holds the planet gears 19 stationary with planet bolts 31, while the external gear ring 18 is attached to the hollow shaft 6 and the sun gear 17 is attached to the drive shaft 5.
  • the hollow shaft 6 rotates not only at a lower speed n 2 but also in the opposite direction to the speed n 1 of the drive shaft.
  • the difference in the peripheral speeds of bearings 10 and dynamic shaft seals 12 is relatively high.
  • the hollow shaft 6, which in turn has a bearing 11 for the housing also forms a support on the suction side for the drive shaft 5 via the bearings 10.
  • the housing 1 is composed of a plurality of housing parts 1 a, 2 and is held together by tie rods 34.
  • Figure 2 differs from that of Figure 1a in that the planetary gear 16 is not with actual gears is realized, but that instead of the gears wheels 17a, 18a, 19a Permanent magnets 35a, b, c are equipped with alternating polarity on the circumference, so one to form contactless, magnetic teeth. That I do not touch the wheels 17a, 18a, 19a, they may also the same liquid - in this case with the Conveying liquid - how the bearings 10, 11 are wetted, which makes dynamic shaft seals superfluous.
  • a hollow shaft 6 with bearings 10 assembled with a connecting piece 28 is rotatably mounted on a drive shaft 5.
  • a partial flow 29 is branched off at a higher pressure with a support 37 and fed to a turbine wheel 26, which is part of the hollow shaft 6, via a control element 30 and a further connection 38 on the suction side via a guide device 27.
  • the partial flow 29 is mixed with the suction flow upstream of the first impeller 9.
  • a speed n 2 is set at a certain pressure drop across the partial flow 29 in accordance with the torque on the first impeller, which speed can be changed at a certain operating point of the pump via the control element 30. It is therefore possible to assign a speed n 2 of the first impeller to certain operating points, which leads to low NPSH R values for the pump.
  • a hydraulic clutch is installed between the hollow shaft 6 and the drive shaft 5, which outputs torque as a torque / speed converter with a slip from the drive shaft 5 at a lower speed n 2 to the first impeller.
  • Shaft seals 12 prevent larger quantities of delivery fluid from reaching the area of the torque converters 21, 22.
  • a transducer part 21 connected to the drive shaft 5 is designed as an annular trough 23, against which liquid rests as a ring in the base due to the centrifugal force. The level of this liquid ring is determined from the outside by a radially displaceable scoop pipe.
  • liquid enters the space between the two bladed converter halves 21, 22 and forms a liquid flow 36 that circulates in the form of a spiral between the two converter halves 21, 22 and a certain torque from the fast rotating drive shaft 5 at a lower speed n 2 to the first impeller 9. Since the level of the liquid in the trough 23 is responsible for the transmissible torque for a certain speed n 2 , the position of the scoop pipe can be assigned to the operating points of the pump characteristics in such a way that lower NPSH R values result. Lubricating fluid is continuously introduced into the space between the housing cover 8 and the shaft bearing 11, which enters the trough 23 and leads to a constant flow through the scoop pipe 24, which permits level control in both directions.
  • the first impeller 9 is rigid connected to the drive shaft 5.
  • the second impeller 9a is mounted with bearings 10 on a sleeve 42, the is also rigidly connected to the drive shaft 5; a planet carrier 20 is also provided with a key 33 connected to the shaft.
  • An impeller nut 40 secures the three bodies 9, 9a, 20 axially.
  • a Stator 3 anchored, that with deflection channels to the second Stage is combined.
  • On one shoulder of the second Impeller 9a is equipped with permanent magnets Central wheel 17a attached with several over the Circumferentially arranged planet gears 19a magnetically combs.
  • the planet gears 19a rotate on planet bolts 31 which are connected to the planet carrier 20.
  • the Permanent magnets of the planet gears 19a mesh magnetically also with the permanent magnets 35a from an outer ring 18a, which is rigidly connected to the pump housing 1. Subsequent housings 2c, 2b dominate one Lip seal 12a and a mechanical seal 12. In a subsequent bearing chair 2a, the shaft 5 is over Bearing 11 stored and secured with a cover 41. Sealing gaps 39 between the housing and rotating parts chosen so that axial thrusts on shaft 5 largely are balanced. The restaxial thrust is through Ball bearing 11 added.
EP98810274A 1998-03-30 1998-03-30 Pompe centrifuge à plusieurs étages Expired - Lifetime EP0947701B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP98810274A EP0947701B1 (fr) 1998-03-30 1998-03-30 Pompe centrifuge à plusieurs étages
DE59812247T DE59812247D1 (de) 1998-03-30 1998-03-30 Mehrstufige Zentrifugalpumpe
US09/273,400 US6179553B1 (en) 1998-03-30 1999-03-22 Multiple stage centrifugal pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98810274A EP0947701B1 (fr) 1998-03-30 1998-03-30 Pompe centrifuge à plusieurs étages

Publications (2)

Publication Number Publication Date
EP0947701A1 true EP0947701A1 (fr) 1999-10-06
EP0947701B1 EP0947701B1 (fr) 2004-11-10

Family

ID=8236017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98810274A Expired - Lifetime EP0947701B1 (fr) 1998-03-30 1998-03-30 Pompe centrifuge à plusieurs étages

Country Status (3)

Country Link
US (1) US6179553B1 (fr)
EP (1) EP0947701B1 (fr)
DE (1) DE59812247D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102606523A (zh) * 2012-03-27 2012-07-25 上海阿波罗机械股份有限公司 一种用于核电站的厂用水泵的转子部件
RU2460903C1 (ru) * 2011-02-04 2012-09-10 Общество С Ограниченной Ответственностью Научно-Производственное Предприятие "Насостехкомплект" Комбинированный многоступенчатый центробежный насос

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006238822A (ja) * 2005-03-04 2006-09-14 Fuji Photo Film Co Ltd 核酸の分離精製方法
US9206814B2 (en) * 2010-03-19 2015-12-08 Hcl Technologies Ltd. Energy saving pump with multiple impellers
CN105257547B (zh) * 2015-11-10 2018-09-21 合肥通用机械研究院有限公司 一种长寿命高效多级离心泵
US11619526B2 (en) 2019-04-11 2023-04-04 Hale Products, Inc. Fire truck pump flow prediction system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191121611A (en) * 1911-09-30 1912-08-01 Anthony George Maldon Michell Improvements in Centrifugal Pumps.
CH442999A (de) * 1965-03-16 1967-08-31 Prvni Brnenska Strojirna Mehrstufige Schleuderpumpe
US4190395A (en) * 1978-04-28 1980-02-26 Borg-Warner Corporation Multiple stage pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH670286A5 (fr) * 1986-06-04 1989-05-31 Sulzer Ag

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191121611A (en) * 1911-09-30 1912-08-01 Anthony George Maldon Michell Improvements in Centrifugal Pumps.
CH442999A (de) * 1965-03-16 1967-08-31 Prvni Brnenska Strojirna Mehrstufige Schleuderpumpe
US4190395A (en) * 1978-04-28 1980-02-26 Borg-Warner Corporation Multiple stage pump

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BAIBAKOV O.V., MATVEEV I.V.: "Better power/speed cavitation for centrifugal pumps", RUSSIAN ENGINEERING JOURNAL, vol. 53, no. 11, 1973, pages 31-35, XP002074905 *
DORNAUS W.L.: "New Ideas needed for the NPSH problem", POWER, vol. 114, no. 6, 1 June 1970 (1970-06-01), pages 74, XP002074906 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2460903C1 (ru) * 2011-02-04 2012-09-10 Общество С Ограниченной Ответственностью Научно-Производственное Предприятие "Насостехкомплект" Комбинированный многоступенчатый центробежный насос
CN102606523A (zh) * 2012-03-27 2012-07-25 上海阿波罗机械股份有限公司 一种用于核电站的厂用水泵的转子部件

Also Published As

Publication number Publication date
DE59812247D1 (de) 2004-12-16
EP0947701B1 (fr) 2004-11-10
US6179553B1 (en) 2001-01-30

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