JPS57159981A - Abnormal pressure indicator in suction side circuit of hydraulic pump - Google Patents

Abnormal pressure indicator in suction side circuit of hydraulic pump

Info

Publication number
JPS57159981A
JPS57159981A JP4538581A JP4538581A JPS57159981A JP S57159981 A JPS57159981 A JP S57159981A JP 4538581 A JP4538581 A JP 4538581A JP 4538581 A JP4538581 A JP 4538581A JP S57159981 A JPS57159981 A JP S57159981A
Authority
JP
Japan
Prior art keywords
pressure
suction
hydraulic pump
side circuit
limit
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
JP4538581A
Other languages
Japanese (ja)
Inventor
Yukio Arima
Hiroaki Shoji
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 Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co 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 Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP4538581A priority Critical patent/JPS57159981A/en
Publication of JPS57159981A publication Critical patent/JPS57159981A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE:To indicate the abnormal pressure automatically by comparing the normal differential pressure between the limit suction pressure of a hydraulic pump and the normal differential pressure across the suction side circuit with the detected value of the suction pressure and the differential pressure between said value and the detected value of the suction filter exit pressure. CONSTITUTION:When a suction filter 5 is choked excessively, the suction pressure of a hydraulic pump 1 will be the negative pressure lower than the limit suction pressure determined in accordance to the r.p.m. of the engine at that time. Said pressure is detected by a sensor 7 and provided to an arythmetic unit 13. While when the signal from a r.p.m. detection sensor 9 is provided to the arythmetic unit 13, it will read out the limit suction pressure and the normal differential pressure across the suction side circuit of the hydraulic pump and compares with the limit suction pressure. Since said normal differential pressure is lower than the limit suction pressure, it is decided to be abnormal pressure and displayed on a choking indicator 17.
JP4538581A 1981-03-30 1981-03-30 Abnormal pressure indicator in suction side circuit of hydraulic pump Pending JPS57159981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4538581A JPS57159981A (en) 1981-03-30 1981-03-30 Abnormal pressure indicator in suction side circuit of hydraulic pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4538581A JPS57159981A (en) 1981-03-30 1981-03-30 Abnormal pressure indicator in suction side circuit of hydraulic pump

Publications (1)

Publication Number Publication Date
JPS57159981A true JPS57159981A (en) 1982-10-02

Family

ID=12717793

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4538581A Pending JPS57159981A (en) 1981-03-30 1981-03-30 Abnormal pressure indicator in suction side circuit of hydraulic pump

Country Status (1)

Country Link
JP (1) JPS57159981A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5992248U (en) * 1982-12-13 1984-06-22 株式会社クボタ power transmission
JPS61283779A (en) * 1985-03-14 1986-12-13 クラウス・メツガ− Method of controlling fluid transporter
EP2055965A1 (en) * 2007-06-07 2009-05-06 Daikin Industries, Ltd. Fluid pressure unit
WO2019208606A1 (en) * 2018-04-25 2019-10-31 株式会社ナイルワークス System, method, and computer program for controlling ejection of chemicals

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5992248U (en) * 1982-12-13 1984-06-22 株式会社クボタ power transmission
JPS61283779A (en) * 1985-03-14 1986-12-13 クラウス・メツガ− Method of controlling fluid transporter
EP2055965A1 (en) * 2007-06-07 2009-05-06 Daikin Industries, Ltd. Fluid pressure unit
EP2055965A4 (en) * 2007-06-07 2010-05-26 Daikin Ind Ltd Fluid pressure unit
US8302394B2 (en) 2007-06-07 2012-11-06 Daikin Industries, Ltd. Fluid pressure unit
WO2019208606A1 (en) * 2018-04-25 2019-10-31 株式会社ナイルワークス System, method, and computer program for controlling ejection of chemicals
JPWO2019208606A1 (en) * 2018-04-25 2020-07-27 株式会社ナイルワークス Drug ejection control system, method, and computer program

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