US20080014082A1 - Multi Stage Diffuser Pump - Google Patents

Multi Stage Diffuser Pump Download PDF

Info

Publication number
US20080014082A1
US20080014082A1 US11/774,729 US77472907A US2008014082A1 US 20080014082 A1 US20080014082 A1 US 20080014082A1 US 77472907 A US77472907 A US 77472907A US 2008014082 A1 US2008014082 A1 US 2008014082A1
Authority
US
United States
Prior art keywords
impellers
stages
blades
casing
multi stage
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.)
Abandoned
Application number
US11/774,729
Other languages
English (en)
Inventor
Katsutoshi Kobayashi
Hayato Shimizu
Tetsuya Yoshida
Yoshimasa Chiba
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.)
Hitachi Plant Technologies Ltd
Original Assignee
Hitachi Plant Technologies Ltd
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 Hitachi Plant Technologies Ltd filed Critical Hitachi Plant Technologies Ltd
Assigned to HITACHI PLANT TECHNOLOGIES, LTD. reassignment HITACHI PLANT TECHNOLOGIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHIBA, YOSHIMASA, KOBAYASHI, KATSUTOSHI, SHIMIZU, HAYATO, YOSHIDA, TETSUYA
Publication of US20080014082A1 publication Critical patent/US20080014082A1/en
Abandoned legal-status Critical Current

Links

Images

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
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2216—Shape, geometry
    • 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
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F04D29/245—Geometry, shape for special effects

Definitions

  • the present invention relates to a multi stage diffuser pump.
  • the first and second means of the related art have a drawback of impairing the efficiency and other characteristics of a multi stage diffuser pump. Hence, when considering these characteristics, the means cannot be expected to produce a large effect and hence presents a problem that the means lack in feasibility.
  • third means is a method for reducing a hydraulic force in a radial direction applied to the diffuser and does not refer to a reduction in the hydraulic force in an axial direction that has the largest effect on the noises of the pump.
  • the object of the present invention is to provide a multi stage diffuser pump in which vibrations and noises can be reduced.
  • a multi stage diffuser pump of the type which includes a rotary shaft rotatably supported in a casing, multiple stages of impellers fixed to the rotary shaft, and multiple stages of guide vanes and return blades fixed to circular disks in the casing in correspondence with the multiple stages of impellers
  • the impellers are combinations of two stages of front and rear stages, which are equivalent in the form and number of blades, and the phases of positions in a peripheral direction of the blades of the impellers of at least one pair of front and rear stages are deviated from each other by 0.5 pitch.
  • the foregoing object is achieved by a construction in which the phases of positions in the peripheral direction of blades of the impellers of at least the one pair of front and rear stages are deviated from each other by 0.47 pitch or more and 0.53 pitch or less.
  • FIG. 1 is a cross-sectional view of an impeller having a first embodiment
  • FIG. 2 is a cross-sectional view along a line A-A′ in FIG. 1 ;
  • FIG. 3 is a cross-sectional view to show the structure of a multi stage diffuser pump
  • FIG. 4 is a conceptual view to illustrate the structure of the multi stage diffuser pump
  • FIG. 5 is a graph to show a temporal change in a hydraulic force applied to a guide vane and a return blade
  • FIG. 6 is a graph to show the acoustic pressure level of noises of the multi stage diffuser pump
  • FIG. 7 is a graph to show a second embodiment of a multi stage diffuser pump according to the present invention.
  • FIG. 8 is a diagram corresponding to FIG. 2 having another embodiment.
  • the inventors of the present invention have further studied the cause of the noises of the multi stage diffuser pump and this time have found that the hydraulic force in the axial direction has an effect on the vibrations and noises.
  • FIG. 3 is a cross-sectional view of a multi stage diffuser pump.
  • a reference numeral 1 denotes a multi stage diffuser pump.
  • an impeller 6 is fixed to a rotary shaft 4 .
  • a reference numeral 7 denotes a guide vane and 8 a denotes a return blade fixed to a circular disk 8 .
  • Plural sets of the impeller 6 , the guide vane 7 , and the return blade 8 a are fixed as plural stages in the axial direction. These parts are covered with a casing 9 .
  • Fluid discharged in a centrifugal direction from the trailing edge of the impeller 6 causes turbulence near the trailing edge.
  • This turbulence causes the fluid to flow in such a way as to cover the circular disk 8 to produce a pressure difference in the axial direction between in the front and rear portions of the circular disk 8 . It was found that this pressure difference vibrated the circular disk 8 in the axial direction and that this vibration was transmitted to the casing 9 to cause noises.
  • a multi stage diffuser pump that includes multiple stages of impellers fixed to a rotary shaft rotatably supported in a casing and multiple stages of guide vanes and return blades fixed on the casing in correspondence with the multiple stages of impellers.
  • FIG. 1 is a cross-sectional view of an impeller having a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view along a line A-A′ in FIG. 1 .
  • FIG. 3 is a cross-sectional view of an assembled multi stage diffuser pump.
  • this embodiment shows a case in which the number of blades of an impeller 6 is seven and the impeller 6 shows a state in a certain stage.
  • Solid lines show the positions in a peripheral direction of blades of the impeller 6 and broken lines show the positions in the peripheral direction of blades of an impeller 6 a of the next stage of the impeller 6 .
  • a reference numeral 2 denotes s shroud, 3 denotes a hub, and 4 denotes a rotary shaft.
  • plural stages each including the impeller 6 , a guide vane 7 , and a return blade 8 a are fixed in the axial direction and these stages are housed in a casing 9 .
  • FIG. 4 is a conceptual view in which a pump part of the multi stage diffuser pump is illustrated in a plane.
  • a reference numeral 9 denotes a casing forming the outer case of the multi stage diffuser pump 1 .
  • the multi stage diffuser pump 1 illustrated in FIG. 4 is constructed of six stages of pumps each of which is constructed of the impeller 6 , the guide vane 7 , and the return blade 8 a .
  • the casing 9 has the guide vanes 7 and the return blades 8 a fixed thereto at specified intervals.
  • the blades of the impeller 6 , the guide vanes 7 , and the return blades 8 a of each stage are identical in form and number. Further, the positions in the peripheral direction where the guide vanes 7 and the return blades 8 a are fixed are identical to each other for all stages.
  • the phases of positions (shown by solid lines) in the peripheral direction of blades of the impeller 6 of a certain stage are deviated by 0.5 pitch.
  • the phase of the hydraulic force shown by a solid line is deviated by 180 degrees from the phase of the hydraulic force shown by a broken line, so it can be found that the hydraulic forces in the axial direction are cancelled.
  • the hydraulic force in the axial direction to be applied to the casing 9 is reduced and hence vibrations in the axial direction of the casing 9 can be reduced.
  • a reduction in the vibrations and noises of the multi stage diffuser pump can be achieved.
  • the phases of positions in the peripheral direction of the blades of the impellers are arbitrary for the respective pairs of front and rear stages, the effect of reducing the vibrations and noises can be produced.
  • FIG. 6 shows acoustic pressure levels around the casing 9 obtained by performing structure simulation in the multi stage diffuser pump constructed of five stages of impellers each having seven impeller blades to which the foregoing method for fixing the impeller blades is applied.
  • the acoustic pressure level of a component the frequency of which is larger than 5NZ is a negligible value, so the acoustic pressure level of the component is not shown.
  • the present method when compared with acoustic pressure levels when the phases are deviated from each other by 90 degrees, the present method can reduce the acoustic pressure level by 61% for a frequency of NZ, by 31% for a frequency of 2NZ, by 17% for a frequency of 3NZ, by 16% for a frequency of 4NZ, and by 53% for a frequency of 5NZ.
  • a multi stage diffuser pump that includes multiple stages of impellers fixed to a rotary shaft rotatably supported in a casing and multiple stages of guide vanes and return blades fixed to the casing in correspondence with the multiple stages of impellers.
  • FIG. 7 shows the relationship between a deviation in the phases of positions in the peripheral direction of the blades of a pair of impellers of two stages of front and rear stages, which are fixed adjacently in the axial direction, and the amplitude value of the resultant hydraulic force in the axial direction at the frequencies of NZ, 2NZ, 3NZ, 4NZ, and 5NZ, the hydraulic forces being applied to the side plates of the guide vanes and the return blades of the front and rear stages.
  • FIG. 8 shows one embodiment of impellers 15 , 16 having the one embodiment of the present invention.
  • the phases of positions in the peripheral direction of blades of the impellers of at least one pair of front and rear stages are deviated from each other by 0.47 pitch or more and 0.53 pitch or less.
  • the hydraulic force in the axial direction of the casing can be reduced, vibrations in the axial direction of the casing can be reduced and hence the noises of the pump can be reduced.
  • the phases of positions in the peripheral direction of the blades of the impellers of at least one pair of front and rear stages are deviated from each other by 0.47 pitch or more and 0.53 pitch or less, whereby a multi stage diffuser pump capable of reducing noises can be realized.
  • the present invention is:
  • a multi stage diffuser pump of the type which includes a rotary shaft rotatably supported in a casing, multiple stages of impellers fixed to the rotary shaft, and multiple stages of guide vanes and return blades fixed to circular disks in the casing in correspondence with the multiple stages of impellers, the improvement wherein the impellers are combinations of two stages of front and rear stages, which are equivalent in the form and number of blades, and wherein the phases of positions in the peripheral direction of the blades of the impellers of at least one pair of front and rear stages are deviated from each other by 0.5 pitch; 2) the multi stage diffuser pump wherein the phases of positions in the peripheral direction of blades of the impellers of at least the one pair of front and rear stages are deviated from each other by 0.47 pitch or more and 0.53 pitch or less; 3) the multi stage diffuser pump wherein the number of blades of the impeller is an even number; 4) the multi stage diffuser pump wherein the number of blades of the impeller is an odd number; and 5) the imp

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US11/774,729 2006-07-12 2007-07-09 Multi Stage Diffuser Pump Abandoned US20080014082A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-191054 2006-07-12
JP2006191054A JP2008019752A (ja) 2006-07-12 2006-07-12 多段ディフューザポンプ

Publications (1)

Publication Number Publication Date
US20080014082A1 true US20080014082A1 (en) 2008-01-17

Family

ID=38949438

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/774,729 Abandoned US20080014082A1 (en) 2006-07-12 2007-07-09 Multi Stage Diffuser Pump

Country Status (3)

Country Link
US (1) US20080014082A1 (zh)
JP (1) JP2008019752A (zh)
CN (1) CN101105190B (zh)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130287561A1 (en) * 2010-11-10 2013-10-31 E.G.O. Elektro-Geraetebau Gmbh Pump
US10405993B2 (en) 2013-11-13 2019-09-10 Tornier Sas Shoulder patient specific instrument
US10716676B2 (en) 2008-06-20 2020-07-21 Tornier Sas Method for modeling a glenoid surface of a scapula, apparatus for implanting a glenoid component of a shoulder prosthesis, and method for producing such a component
US10959742B2 (en) 2017-07-11 2021-03-30 Tornier, Inc. Patient specific humeral cutting guides
US11065016B2 (en) 2015-12-16 2021-07-20 Howmedica Osteonics Corp. Patient specific instruments and methods for joint prosthesis
US11166733B2 (en) 2017-07-11 2021-11-09 Howmedica Osteonics Corp. Guides and instruments for improving accuracy of glenoid implant placement
US20220381249A1 (en) * 2021-05-31 2022-12-01 Mitsubishi Heavy Industries Compressor Corporation Centrifugal compressor
US12035929B2 (en) 2021-06-28 2024-07-16 Howmedica Osteonics Corp. Patient specific humeral cutting guides

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5567968B2 (ja) * 2010-09-30 2014-08-06 株式会社日立製作所 多段遠心圧縮機
CN103742444B (zh) * 2013-12-31 2017-11-17 江苏大学 一种多相混输泵叶轮的多工况设计方法
CN108223457A (zh) * 2017-12-16 2018-06-29 朱浩奇 一种家用电扇电机的冷却降噪装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887940A (en) * 1987-07-23 1989-12-19 Hitachi, Ltd. Multistage fluid machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19509255A1 (de) * 1994-03-19 1995-09-21 Klein Schanzlin & Becker Ag Einrichtung zur Geräuschreduzierung bei Kreiselpumpen
CN2245680Y (zh) * 1995-07-12 1997-01-22 徐曦 爪式转子真空泵

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887940A (en) * 1987-07-23 1989-12-19 Hitachi, Ltd. Multistage fluid machine

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10716676B2 (en) 2008-06-20 2020-07-21 Tornier Sas Method for modeling a glenoid surface of a scapula, apparatus for implanting a glenoid component of a shoulder prosthesis, and method for producing such a component
US11432930B2 (en) 2008-06-20 2022-09-06 Tornier Sas Method for modeling a glenoid surface of a scapula, apparatus for implanting a glenoid component of a shoulder prosthesis, and method for producing such a component
US20130287561A1 (en) * 2010-11-10 2013-10-31 E.G.O. Elektro-Geraetebau Gmbh Pump
US11179249B2 (en) 2013-11-13 2021-11-23 Tornier Sas Shoulder patient specific instrument
US10405993B2 (en) 2013-11-13 2019-09-10 Tornier Sas Shoulder patient specific instrument
US11980377B2 (en) 2015-12-16 2024-05-14 Howmedica Osteonics Corp. Patient specific instruments and methods for joint prosthesis
US11065016B2 (en) 2015-12-16 2021-07-20 Howmedica Osteonics Corp. Patient specific instruments and methods for joint prosthesis
US11234721B2 (en) 2017-07-11 2022-02-01 Howmedica Osteonics Corp. Guides and instruments for improving accuracy of glenoid implant placement
US11166733B2 (en) 2017-07-11 2021-11-09 Howmedica Osteonics Corp. Guides and instruments for improving accuracy of glenoid implant placement
US11278299B2 (en) 2017-07-11 2022-03-22 Howmedica Osteonics Corp Guides and instruments for improving accuracy of glenoid implant placement
US11399851B2 (en) 2017-07-11 2022-08-02 Howmedica Osteonics Corp. Guides and instruments for improving accuracy of glenoid implant placement
US11076873B2 (en) 2017-07-11 2021-08-03 Howmedica Osteonics Corp. Patient specific humeral cutting guides
US11918239B2 (en) 2017-07-11 2024-03-05 Howmedica Osteonics Corp. Guides and instruments for improving accuracy of glenoid implant placement
US10959742B2 (en) 2017-07-11 2021-03-30 Tornier, Inc. Patient specific humeral cutting guides
US20220381249A1 (en) * 2021-05-31 2022-12-01 Mitsubishi Heavy Industries Compressor Corporation Centrifugal compressor
US11788536B2 (en) * 2021-05-31 2023-10-17 Mitsubishi Heavy Industries Compressor Corporation Centrifugal compressor
US12035929B2 (en) 2021-06-28 2024-07-16 Howmedica Osteonics Corp. Patient specific humeral cutting guides

Also Published As

Publication number Publication date
CN101105190B (zh) 2010-06-02
CN101105190A (zh) 2008-01-16
JP2008019752A (ja) 2008-01-31

Similar Documents

Publication Publication Date Title
US20080014082A1 (en) Multi Stage Diffuser Pump
US5857834A (en) Centrifugal fluid machine
CN102705266B (zh) 压缩机
JP5753199B2 (ja) 非周期的な遠心圧縮機ディフューザ
EP2182220A1 (en) Turbo machine and method to reduce vibration in turbo machines.
JP2000045992A (ja) 送風羽根及び回転電機
US4887940A (en) Multistage fluid machine
CN107762985B (zh) 离心式压缩机
JP2009264205A (ja) 遠心圧縮機
JP2016512586A (ja) 異なる後縁プロフィルを持つベーンを交互に配置したベーン配置
JP2002138991A (ja) 両吸込渦巻ポンプ
JP6763803B2 (ja) 遠心回転機械
JP3912331B2 (ja) 遠心形流体機械
JP2003090279A (ja) 水力回転機械用ベーン
JPH0514120B2 (zh)
US20060034688A1 (en) Axial fan assembly
JP4844341B2 (ja) 多段ディフューザポンプ
JP3072867B2 (ja) 多段遠心圧縮機
JPH06288398A (ja) 遠心圧縮機
RU2377445C1 (ru) Осевое рабочее колесо
JPH10131893A (ja) 遠心形流体機械
JP2012145064A (ja) 流体機械のディフューザ構造
RU2280169C2 (ru) Осевая турбомашина с пониженным уровнем пульсаций давления, возбуждающих вибрации лопаток и излучаемый шум
JPS59593A (ja) 送風機
JP2017057779A (ja) ターボチャージャ

Legal Events

Date Code Title Description
AS Assignment

Owner name: HITACHI PLANT TECHNOLOGIES, LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOBAYASHI, KATSUTOSHI;SHIMIZU, HAYATO;YOSHIDA, TETSUYA;AND OTHERS;REEL/FRAME:019555/0992

Effective date: 20070605

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION