WO2004011813A1 - Procede et dispositif de determination discrete de la position relative d'un piston diviseur d'un accumulateur - Google Patents

Procede et dispositif de determination discrete de la position relative d'un piston diviseur d'un accumulateur Download PDF

Info

Publication number
WO2004011813A1
WO2004011813A1 PCT/NO2003/000256 NO0300256W WO2004011813A1 WO 2004011813 A1 WO2004011813 A1 WO 2004011813A1 NO 0300256 W NO0300256 W NO 0300256W WO 2004011813 A1 WO2004011813 A1 WO 2004011813A1
Authority
WO
WIPO (PCT)
Prior art keywords
accumulator
dividing piston
piston
coils
magnetizing
Prior art date
Application number
PCT/NO2003/000256
Other languages
English (en)
Inventor
Kjell Olav HÅLAND
Original Assignee
Maritime Hydraulics As
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 Maritime Hydraulics As filed Critical Maritime Hydraulics As
Priority to AU2003248515A priority Critical patent/AU2003248515A1/en
Publication of WO2004011813A1 publication Critical patent/WO2004011813A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F15B2201/312—Sealings therefor, e.g. piston rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/515—Position detection for separating means

Definitions

  • This invention regards a method of determining the position of a dividing piston in a hydraulic accumulator. In particular, it regards a method of determining the axial position of the dividing piston in the accumulator.
  • the invention also includes a device for implementing the method.
  • a hydraulic accumulator can be used in a hydraulic system in order to introduce a spring function into the system.
  • the accumulator is designed so as to allow it to receive and deliver a volume of hydraulic fluid upon compression and expansion of the gas volume in the accumulator.
  • the proximity indicators are designed to indicate in a non-contact manner the presence of e.g. a metal object such as a dividing piston in the proximity of the indicator.
  • the main flaw in the method is the difficulty of finding an appropriate solution to the problem of installation, as the indicators are incapable of performing proximity indication through the relatively large material thicknesses in question.
  • the object of the invention is to remedy the disadvantages of prior art.
  • a number of magnetizing coils of a type that is known per se are arranged on the outside of the accumulator, preferably spaced evenly along the longitudinal direction of the accumulator.
  • the coils are supplied with an alternating voltage that effects the establishment of a magnetic field at a given frequency in the area by the coil and into the accumulator case. If the dividing piston is located inside the coil in question, the metal of the dividing piston will be magnetized.
  • a number of sensor coils are arranged on the accumulator case, preferably spaced evenly in the longitudinal direction of the accumulator.
  • the sensor coils are designed to measure the intensity and frequency of the magnetic field.
  • Knowing the position of each sensor coil makes it possible to determine the position of the dividing piston in the accumulator, based on which sensor coil emits the indicating signal.
  • Figure 1 shows an accumulator where the outside of the accumulator case is fitted with a number of magnetizing coils and sensor coils.
  • reference number 1 denotes an accumulator comprising an accumulator case 2 fitted with a first end gable 4 and a second end gable 6.
  • a dividing piston 8 is slidingly located inside the accumulator case 2 in a sealing manner.
  • a first chamber 10 defined by the accumulator case 2, the dividing piston 8 and the first end gable 4 is filled with pressurised gas.
  • a through bore 12 in the first end gable 4 connects the chamber 10 with a gas pipe 14.
  • a second chamber 16 defined by the accumulator case 2 , the dividing chamber 8 and the second end gable 6 is filled with hydraulic fluid.
  • a through bore 18 in the second end gable 6 connects the second chamber 16 with a hydraulic fluid pipe 20.
  • the dividing piston 8 When hydraulic fluid flows in through the hydraulic fluid pipe 20 to the second chamber 16, the dividing piston 8 is displaced in the direction of the first end gable 4 through compression of the gas present in the first chamber 10. The dividing piston 8 is displaced in the opposite direction when hydraulic fluid is drained from the second chamber 16, as the gas in the first chamber 10 then expands. Gas may be introduced into or evacuated from the first chamber 10 via the gas pipe 14.
  • a number of magnetizing coils 22 are arranged on the outside of the accumulator case 2, preferably equidistantly spaced along the accumulator 1.
  • a number of sensor coils 24 are arranged along the accumulator case 2.
  • the magnetizing and sensor coils 22, 24 may be arranged e.g. in pairs or in groups comprising one magnetizing coil 22 and two sensor coils 24.
  • the magnetizing coils 22 are supplied with an alternating voltage through lines that are not shown, whereby a magnetic field at a given frequency is established at each magnetising coil 22.
  • the dividing piston 8 may be magnetized by one or more of the magnetizing coils 22 through the metal wall of the accumulator case 2.
  • the sensor coils 24 are designed to measure the intensity and frequency of a magnetic field. When the dividing piston 8 is located at a sensor coil 24, the sensor coil(s) 24 located at the dividing piston 8 will emit a signal different from the rest of the sensor coils 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de déterminer la position d'un piston diviseur (8) dans un accumulateur (1), le piston diviseur (8) étant magnétisé par au moins une bobine de magnétisation (22), le champ magnétique du piston diviseur (8) étant mesuré par une bobine détectrice (24) située à proximité du piston (8), le signal provenant de la bobine détectrice proximale (24) étant comparé à un signal provenant d'une bobine détectrice (24) située à une distance définie du piston diviseur (8).
PCT/NO2003/000256 2002-07-25 2003-07-24 Procede et dispositif de determination discrete de la position relative d'un piston diviseur d'un accumulateur WO2004011813A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003248515A AU2003248515A1 (en) 2002-07-25 2003-07-24 Method and device for discrete determination of the relative position of an accumulator's deviding piston

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20023542 2002-07-25
NO20023542A NO20023542D0 (no) 2002-07-25 2002-07-25 Fremgangsmåte og anordning for diskret å bestemme posisjonen til en hydraulisk akkumulators skillestempel

Publications (1)

Publication Number Publication Date
WO2004011813A1 true WO2004011813A1 (fr) 2004-02-05

Family

ID=19913854

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2003/000256 WO2004011813A1 (fr) 2002-07-25 2003-07-24 Procede et dispositif de determination discrete de la position relative d'un piston diviseur d'un accumulateur

Country Status (3)

Country Link
AU (1) AU2003248515A1 (fr)
NO (1) NO20023542D0 (fr)
WO (1) WO2004011813A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013098322A3 (fr) * 2011-12-28 2013-08-22 Robert Bosch Gmbh Procédé permettant de déterminer la position d'un piston dans un accumulateur de pression à piston au moyen de capteurs inductifs et accumulateur de pression à piston conçu de manière adaptée
WO2014033104A1 (fr) * 2012-08-28 2014-03-06 Sensorlink As Piste de piston acoustique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2021770A (en) * 1978-04-11 1979-12-05 Univ Cardiff Distance measuring
WO1985005710A1 (fr) * 1984-06-01 1985-12-19 Scientific-Atlanta, Inc. Dispositif de servocommande lineaire avec senseur de position a transformateur integre
US4799048A (en) * 1984-09-28 1989-01-17 Nippondenso Co., Ltd. Accumulator
US4804913A (en) * 1982-12-23 1989-02-14 Kabushiki Kaisha Sg Positioning control system for a fluid powered cylinder
US5024250A (en) * 1989-01-10 1991-06-18 Nakamura Koki Co., Ltd. Piston type accumulator for hydraulic system
US5198761A (en) * 1990-03-06 1993-03-30 Hitachi Construction Machinery Co., Ltd. Temperature compensated magnetostrictive piston position detector

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2021770A (en) * 1978-04-11 1979-12-05 Univ Cardiff Distance measuring
US4804913A (en) * 1982-12-23 1989-02-14 Kabushiki Kaisha Sg Positioning control system for a fluid powered cylinder
WO1985005710A1 (fr) * 1984-06-01 1985-12-19 Scientific-Atlanta, Inc. Dispositif de servocommande lineaire avec senseur de position a transformateur integre
US4799048A (en) * 1984-09-28 1989-01-17 Nippondenso Co., Ltd. Accumulator
US5024250A (en) * 1989-01-10 1991-06-18 Nakamura Koki Co., Ltd. Piston type accumulator for hydraulic system
US5198761A (en) * 1990-03-06 1993-03-30 Hitachi Construction Machinery Co., Ltd. Temperature compensated magnetostrictive piston position detector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013098322A3 (fr) * 2011-12-28 2013-08-22 Robert Bosch Gmbh Procédé permettant de déterminer la position d'un piston dans un accumulateur de pression à piston au moyen de capteurs inductifs et accumulateur de pression à piston conçu de manière adaptée
CN104024655A (zh) * 2011-12-28 2014-09-03 罗伯特·博世有限公司 用于借助于感应传感器来确定活塞在活塞压力储存器中的位置的方法以及合适地构造的活塞压力储存器
US20140360360A1 (en) * 2011-12-28 2014-12-11 Robert Bosch Gmbh Method for determining a position of a piston in a piston pressure accumulator by means of inductive sensors and suitably designed piston pressure accumulator
JP2015503715A (ja) * 2011-12-28 2015-02-02 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング ピストン蓄圧器内部のピストンの位置を誘導センサを使って特定する方法ならびに好適設計のピストン蓄圧器
WO2014033104A1 (fr) * 2012-08-28 2014-03-06 Sensorlink As Piste de piston acoustique

Also Published As

Publication number Publication date
NO20023542D0 (no) 2002-07-25
AU2003248515A1 (en) 2004-02-16

Similar Documents

Publication Publication Date Title
CA1270918A (fr) Methode de detection de la corrosion sur des recipients conductifs
US10732063B2 (en) Device for measuring the pressure of a fluid flowing through a pipeline
CN1307401C (zh) 确定表面轮廓的测量方法
EP1360467B1 (fr) Mesure de contrainte dans un materiau ferromagnetique
US6501266B1 (en) Procedure and device for detecting nonuniformities in the wall thickness of inaccessible metal pipes
US8531329B2 (en) Method and device for determining the thickness of material using high frequency
KR20140111306A (ko) 유도 센서들에 의해 피스톤 압력 어큐뮬레이터 내 피스톤의 위치를 검출하기 위한 방법 및 대응 피스톤 압력 어큐뮬레이터
US7111497B2 (en) Leak detection apparatus for lined vessels and method of use
EP3184973B1 (fr) Dispositif de mesure d'une propriété d'un fluide en écoulement
KR101746072B1 (ko) 강자성체 증기발생기 튜브의 비파괴 검사장치 및 그 방법
WO2004011813A1 (fr) Procede et dispositif de determination discrete de la position relative d'un piston diviseur d'un accumulateur
US7603900B2 (en) Leakage inspection apparatus for liquid storage tank technical field
JPH11133003A (ja) Ｐｐｍ電磁超音波トランスジューサとｐｐｍ電磁超音波トランスジューサを用いた探傷装置及び探傷方法
JP4118488B2 (ja) 離隔渦流法による管の肉厚測定装置
JP4745788B2 (ja) 軸変位計測装置及び軸変位計測方法
JPH0457961B2 (fr)
Willems et al. Advanced possibilities for corrosion inspection of gas pipelines using EMAT-technology
JP2002349179A (ja) 孔内水平載荷試験方法及び装置
RU2002124294A (ru) Способ и устройство определения остаточного ресурса тонкостенных оболочек из резервуарных и трубных сталей
EP3798567A1 (fr) Procédé et système permettant de déterminer l'épaisseur d'un tuyau
JPH08101168A (ja) 導管検査用ピグの走行監視システム
JP2000275223A (ja) 検査具及びその使用方法
JP2001289824A (ja) 鋼管の腐食診断方法
JP2007298323A (ja) 電磁波パルスによる減肉検出方法及び減肉検出装置
RU2156447C2 (ru) Способ ультразвукового контроля наличия (проскока) жидкости в трубопроводе

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP