JPS54119103A - Pump operating method and system - Google Patents

Pump operating method and system

Info

Publication number
JPS54119103A
JPS54119103A JP2539478A JP2539478A JPS54119103A JP S54119103 A JPS54119103 A JP S54119103A JP 2539478 A JP2539478 A JP 2539478A JP 2539478 A JP2539478 A JP 2539478A JP S54119103 A JPS54119103 A JP S54119103A
Authority
JP
Japan
Prior art keywords
lift
runner
sectional size
back flow
range
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.)
Pending
Application number
JP2539478A
Other languages
Japanese (ja)
Inventor
Tadashi Mizuno
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 Ltd
Original Assignee
Hitachi 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 Ltd filed Critical Hitachi Ltd
Priority to JP2539478A priority Critical patent/JPS54119103A/en
Publication of JPS54119103A publication Critical patent/JPS54119103A/en
Pending legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Landscapes

  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Water Turbines (AREA)

Abstract

PURPOSE: For improving the characteristic of unstability range so that favourable operational condition may be obtained constantly, to reduce lift current in sectional size in the vicinity of the lower end of a runner by feeding pressure water to the extensible tube encased in the groove in the vicinity of the lower end of said runner when back flow has occurred.
CONSTITUTION: When lift has increased and lift rate has decreased, both gradually, to the values within unstability range with a pump operated, a lift detector 14 and a lift rate detector 15 detect this and open a discharge pressure adjustor 13. Thereby, an extensible tube in a groove 9 is supplied with pressure water from a casing 7 through a high-pressure conduit pipe 11 to expand into a suction pipe 4 so that lift decreases in sectional size. Even if lift has increased further and there has arisen a possibility of back flow 16 in said runner 2, back flow water decreases, no sharp flow change takes place and transfer to stability range is made smoothly since lift current is reduced in sectional size.
COPYRIGHT: (C)1979,JPO&Japio
JP2539478A 1978-03-08 1978-03-08 Pump operating method and system Pending JPS54119103A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2539478A JPS54119103A (en) 1978-03-08 1978-03-08 Pump operating method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2539478A JPS54119103A (en) 1978-03-08 1978-03-08 Pump operating method and system

Publications (1)

Publication Number Publication Date
JPS54119103A true JPS54119103A (en) 1979-09-14

Family

ID=12164664

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2539478A Pending JPS54119103A (en) 1978-03-08 1978-03-08 Pump operating method and system

Country Status (1)

Country Link
JP (1) JPS54119103A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015037669A1 (en) * 2013-09-12 2015-03-19 株式会社 荏原製作所 Device and method for alleviating and preventing cavitation surge of water supply conduit system
JP2017020514A (en) * 2016-11-01 2017-01-26 三菱重工業株式会社 Centrifugal compressor
CN106968989A (en) * 2013-02-22 2017-07-21 三菱重工业株式会社 Centrifugal compressor
CN110382878A (en) * 2017-03-02 2019-10-25 柏林工业大学 Determine the method and apparatus and application thereof for predicting instable index in compressor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106968989A (en) * 2013-02-22 2017-07-21 三菱重工业株式会社 Centrifugal compressor
US10167877B2 (en) 2013-02-22 2019-01-01 Mitsubishi Heavy Industries, Ltd. Centrifugal compressor
WO2015037669A1 (en) * 2013-09-12 2015-03-19 株式会社 荏原製作所 Device and method for alleviating and preventing cavitation surge of water supply conduit system
JPWO2015037669A1 (en) * 2013-09-12 2017-03-02 株式会社荏原製作所 Apparatus and method for mitigating and preventing cavitation surge in a water pipe system
US11378084B2 (en) 2013-09-12 2022-07-05 Ebara Corporation Apparatus and method for alleviating and preventing cavitation surge of water supply conduit system
JP2017020514A (en) * 2016-11-01 2017-01-26 三菱重工業株式会社 Centrifugal compressor
CN110382878A (en) * 2017-03-02 2019-10-25 柏林工业大学 Determine the method and apparatus and application thereof for predicting instable index in compressor
CN110382878B (en) * 2017-03-02 2020-12-08 柏林工业大学 Method and apparatus for determining indicators for predicting instability in compressors and use thereof

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