EP3964713A1 - Mehrstufige zentrifugalpumpe zum fördern eines fluids - Google Patents

Mehrstufige zentrifugalpumpe zum fördern eines fluids Download PDF

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Publication number
EP3964713A1
EP3964713A1 EP21190198.8A EP21190198A EP3964713A1 EP 3964713 A1 EP3964713 A1 EP 3964713A1 EP 21190198 A EP21190198 A EP 21190198A EP 3964713 A1 EP3964713 A1 EP 3964713A1
Authority
EP
European Patent Office
Prior art keywords
fluid
impeller
stage impeller
suction
pump
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Withdrawn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
EP21190198.8A
Other languages
English (en)
French (fr)
Inventor
Bruno Maroccia
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 Management AG
Original Assignee
Sulzer Management AG
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 Management AG filed Critical Sulzer Management AG
Publication of EP3964713A1 publication Critical patent/EP3964713A1/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Withdrawn legal-status Critical Current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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—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
    • 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
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/006—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps double suction 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
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/10—Multi-stage pumps with means for changing the flow-path through the stages, e.g. series-parallel, e.g. side loads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/005—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by changing flow path between different stages or between a plurality of compressors; Load distribution between compressors
    • 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
    • F04D29/185—Rotors consisting of a plurality of wheels
    • 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
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
    • F04D29/286—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors multi-stage rotors
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4293—Details of fluid inlet or outlet
    • 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 relates to a multistage centrifugal pump for conveying a fluid in accordance with the preamble of the independent claim.
  • Centrifugal pumps for conveying a fluid for example a liquid such as water
  • a fluid for example a liquid such as water
  • Multistage centrifugal pumps have at least two impellers and a shaft for rotating the impellers.
  • the impellers may be configured for example as radial impellers or as axial or semi-axial impellers or as helicoaxial impellers.
  • the impellers may be configured as open impellers or as a closed impellers, where a shroud is provided on the impeller, said shroud at least partially covering the vanes of the impeller, or as a semi-open impeller.
  • an impeller as a single suction impeller or as a double suction impeller.
  • the fluid approaches the impeller only from one side, i.e. the impeller has only one suction side.
  • the fluid approaches the impeller from both sides, i.e. the impeller has two suction sides.
  • centrifugal pumps with a combination of single suction impeller(s) and double suction impellers.
  • a plurality of impellers is mounted to the shaft in a torque proof manner, wherein the impellers are arranged in series on the shaft.
  • Many multistage centrifugal pumps are provided with at least one balancing arrangement for at least partially balancing the axial thrust that is generated by the impellers during operation of the pump.
  • the balancing arrangement shall reduce the total axial thrust generated by the rotating impellers (hydraulic forces) and acting on the axial bearing or the thrust bearing.
  • the residual thrust needs to be absorbed by the bearing, whose size, weight and cost is proportional to the magnitude of said residual thrust, hence there is a need of reducing the residual thrust as much as possible. Besides this, high forces are associated with higher mechanical losses that ultimately reduce the efficiency of the pump.
  • balance devices have a negative impact on the efficiency of the pump.
  • Another means for handling the residual axial thrust is to provide strong or properly sized bearings, which can absorb the residual thrust.
  • this measure too, may have a negative impact on the overall efficiency of the pump, because of higher mechanical losses associated with higher bearing loading.
  • a multistage centrifugal pump for conveying a fluid comprising a pump housing with an inlet and an outlet for the fluid, a first stage impeller and a second stage impeller for conveying the fluid from the inlet to the outlet, and a shaft for rotating each impeller about an axial direction, wherein each impeller is configured as a double suction impeller, having a first suction side, a second suction side for receiving the fluid, and a discharge side for discharging the fluid, wherein the discharge side of the first stage impeller comprises two separate exits, namely a first exit for discharging the fluid into a first crossover line, and a second exit for discharging the fluid into a second crossover line, wherein the first crossover line is in fluid communication with the first suction side of the second stage impeller, and the second crossover line is in fluid communication with the second suction side of the second stage impeller.
  • the configuration according to the invention enables a fully symmetric design of the hydraulics of the multistage pump, thus providing a balancing of the axial thrust generated by the rotating impellers.
  • the fluid discharged from the discharge side is divided by the two separate exits. A part of the fluid flows through the first exit into the first crossover line and is supplied to the first suction side of the second stage impeller, and another part of the fluid flows through the second exit into the second crossover line and is supplied to the second suction side of the second stage impeller.
  • first crossover line and the second crossover line are arranged within the pump housing.
  • Each crossover line may be configured as a channel, for example as a channel delimited by the pump housing, wherein said channel guides the fluid from the discharge side of the first stage impeller to the first or the second suction side of the second stage impeller.
  • Arranging the crossover lines inside the pump housing has the advantage that bulky and heavy external pipes may be avoided which considerably reduces the weight of the pump and also the manufacturing costs.
  • the pump has a first volute for guiding a first stream of the fluid from the discharge side of the first stage impeller into the first crossover line, and a second volute for guiding a second stream of the fluid into the second crossover line. Since the first and the second volute transform kinetic energy of the fluid into pressure the efficiency of the pump is enhanced.
  • first exit and the second exit are displaced by 180° with respect to each other, when viewed in a circumferential direction of the first stage impeller.
  • first suction side of the first stage impeller is in fluid communication with the inlet by means of a first suction line
  • second suction side of the first stage impeller is in fluid communication with the inlet by means of a second suction line
  • first suction line and the second suction line are arranged within the pump housing.
  • Each suction line may be configured as a channel, for example as a channel delimited by the pump housing, wherein said channel guides the fluid entering through the inlet to the first or the second suction side of the first stage impellers.
  • the centrifugal pump has exactly two impellers, namely the first stage impeller and the second stage impeller.
  • the centrifugal pump according to the invention may also be configured with more than two stages
  • the multistage centrifugal pump is configured as a between-bearing pump.
  • Fig. 1 shows a schematic representation of an embodiment of a multistage centrifugal pump according to the invention, which is designated in its entity with reference numeral 1.
  • the pump 1 is designed as a centrifugal pump for conveying a fluid, for example a liquid such as water.
  • the multistage centrifugal pump 1 comprises a pump housing 2 having an inlet 3 and an outlet 4 for the fluid to be conveyed.
  • the centrifugal pump 1 further comprises a first stage impellers 5 and second stage impeller 6, as well as a shaft 7 for rotating the impellers 5, 6 about an axial direction A.
  • the axial direction A is defined by the axis of the shaft 7.
  • Each impeller 5, 6 is mounted to the shaft 7 in a torque proof manner.
  • the shaft 7 has a drive end 71, which may be connected to a drive unit (not shown) for driving the rotation of the shaft 7 about the axial direction A.
  • the drive unit may comprise, for example, an electric motor.
  • the other end of the shaft 7 is referred to as non-drive end 72.
  • the multistage centrifugal pump 1 is configured as a two stage pump with the first stage impeller 5 and the second stage impeller 6. In other embodiments the multistage centrifugal pump according to the invention may be configured with more than two stages.
  • Both the first stage impeller 5 and the second stage impeller 6 are configured as a double suction impeller, i.e. the fluid approaches the particular impeller 5 or 6 from both sides regarding the axial direction A.
  • both the first stage impeller 5 and the second stage impeller 6 have a first suction side S1 on the left side in Fig. 1 and a second suction side S2 at the right side in Fig. 1 .
  • each impeller 5 and 6 has a discharge side D at the radially outer region of the particular impeller 5 or 6, where the fluid exits the impeller 5 or 6.
  • suction sides S1, S2 are these sides where the eyes of the impellers 5 or 6 are arranged, i.e. the sides, from which the fluid approaches the impeller 5 or 6.
  • the discharge side D is the side where the fluid is discharged from the impeller 5 or 6.
  • the discharge side D of the second stage impeller 6 is in fluid communication with the outlet 4 of the pump 1.
  • the outflow of the fluid discharged through the outlet 4 is indicated by the arrow O in Fig. 1 .
  • Each of the suction sides S1 and S2 of the first stage impeller 5 is in fluid communication with the inlet 3.
  • a first suction line 81 constitutes the fluid communication between the inlet 3 and the first suction side S1 of the first stage impeller 5, and a second suction line 82 constitutes the fluid communication between the inlet 3 and the second suction side S2 of the first stage impeller 5.
  • Each suction line 81, 82 may be configured as a channel which is delimited by the pump housing 2 or an inlet housing (not shown) that is part of the pump housing 2.
  • the inflow I of the fluid to be conveyed enters the pump housing 2 through the inlet 3 and is then divided in a first stream passing through the first suction line 81 and a second stream passing through the second suction line 82.
  • FIG. 2 shows a cross-sectional view of the first stage impeller 5in a section perpendicular to the axial direction A.
  • the discharge side D of the first stage impeller 5 comprises two separate exits, namely a first exit 20 and a second exit 30.
  • a first exit 20 a part of the fluid is discharged into a first crossover line 91 (see Fig. 1 ).
  • a second crossover line 92 a part of the fluid is discharged into a second crossover line 92.
  • the first crossover line 91 is connected to the first suction side S1 of the second stage impeller 6 and the second crossover line 92 is connected to the second suction side S2 of the second stage impeller 6.
  • the flow of the fluid leaving the discharge side D of the first stage impeller 5 is divided in a first stream leaving the discharge side D of the first stage impeller 5 through the first exit 20 and a second stream leaving the discharge side D of the first stage impeller 5 through the second exit 30.
  • the first crossover line 91 the first stream is guided to the first suction side S1 of the second stage impeller 6.
  • the second crossover line 92 the second stream is guided to the second suction side S2 of the second stage impeller 6.
  • the residual thrust generated by the first stage impellers 5 is at least approximately zero due to the double suction design. Since the second stage impeller 6 is also configured as a double suction impeller 6 with the first suction side S1 and the second suction side S2, the residual axial thrust generated by the second stage impeller 6 is also at least approximately zero.
  • each of the crossover lines 91, 92 is preferably configured as an internal line completely arranged inside the pump housing 2.
  • the centrifugal pump 1 comprises bearings (not shown) on both ends of the shaft 7, namely at or near the non-drive end 72 of the shaft, and near the drive end 71 of the shaft 7, i.e. the centrifugal pump 1 is designed as a between-bearing pump.
  • the inflow I of the fluid enters the pump housing 2 through the inlet 3 and is then divided into a part passing through the first suction line 81 to the first suction side S1 of the first stage impeller 5 and another part passing through the second suction line 82 to the second suction side S2 of the first stage impeller 5.
  • the first stream is discharged through the first exit 20 in the first crossover line 91 and guided to the first suction side S1 of the second stage impeller 6.
  • the second stream is discharged at the discharge side D of the first stage impeller 5 through the second exit 30 in the second crossover line 92 and guided to the second suction side S2 of the second stage impeller 6.
  • the first stream and the second stream are reunited with each other and leave the pump 1 through the outlet 4 as outflow O.
  • the multistage pump 1 has a first volute 21 for guiding the first stream of the fluid from the discharge side D of the first stage impeller 5 into the first crossover line 91, and a second volute 31 for guiding the second stream of the fluid from the discharge side D of the first stage impeller 5 into the second crossover line 92.
  • first exit 20 and the second exit 30 are displaced by 180° with respect to each other, when viewed in a circumferential direction of the first stage impeller 5.
EP21190198.8A 2020-09-03 2021-08-06 Mehrstufige zentrifugalpumpe zum fördern eines fluids Withdrawn EP3964713A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20194258 2020-09-03

Publications (1)

Publication Number Publication Date
EP3964713A1 true EP3964713A1 (de) 2022-03-09

Family

ID=72355838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21190198.8A Withdrawn EP3964713A1 (de) 2020-09-03 2021-08-06 Mehrstufige zentrifugalpumpe zum fördern eines fluids

Country Status (3)

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US (1) US20220065255A1 (de)
EP (1) EP3964713A1 (de)
CN (1) CN114135491A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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CN114673566A (zh) * 2022-03-31 2022-06-28 北京大臻科技有限公司 一种用于天然气管网压力能回收的压差发电装置和系统

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GB2072748A (en) * 1980-03-27 1981-10-07 Klein Schanzlin & Becker Ag Multistage condensate pump
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Publication number Publication date
US20220065255A1 (en) 2022-03-03
CN114135491A (zh) 2022-03-04

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