EP0263115A1 - Capteur de mesure pour systemes hydrauliques - Google Patents

Capteur de mesure pour systemes hydrauliques

Info

Publication number
EP0263115A1
EP0263115A1 EP19870900811 EP87900811A EP0263115A1 EP 0263115 A1 EP0263115 A1 EP 0263115A1 EP 19870900811 EP19870900811 EP 19870900811 EP 87900811 A EP87900811 A EP 87900811A EP 0263115 A1 EP0263115 A1 EP 0263115A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
net
sensor according
characterized gekennzeich
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Withdrawn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
EP19870900811
Other languages
German (de)
English (en)
Inventor
Kurt Oelsch
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.)
OELSCH KG
Original Assignee
OELSCH KG
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 OELSCH KG filed Critical OELSCH KG
Publication of EP0263115A1 publication Critical patent/EP0263115A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0089—Transmitting or indicating the displacement of pistons by electrical, electromechanical, magnetic or electromagnetic means
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means

Definitions

  • the invention relates to a transducer for hydraulic systems.
  • a pressure sensor is known from FR-A-1 371 499, in which a pushbutton of an inductive displacement sensor rests on a resilient metal membrane acted upon by the measuring pressure on its side facing away from the measuring pressure.
  • the button is therefore outside the medium under the measuring pressure.
  • the inductive displacement sensor contains a differential transformer with a central primary winding and secondary windings arranged symmetrically on both sides of the same and with a core arranged inside the windings and attached to the button.
  • the pressure element and the core of the differenti al transformer are different components.
  • GB-A-267 804 describes a mercury manometer with a U-shaped mercury vessel. One leg of this mercury vessel is connected to a pressure connection on which a the pressure is given. In the other, enlarged leg, a float floats on the surface of the mercury. This float is connected via a rod to the movable core of an inductive displacement sensor which supplies a pressure-dependent output signal.
  • the pressure is determined here by a column of mercury in a U-tube.
  • the mercury column is detected by a float, the movement of which is transferred to a separate core of an inductive displacement sensor.
  • GB-A-2 049 942 discloses a pressure transmitter in which a pressure to be measured is connected to a pressure cell arrangement with pressure cells made of resilient sheet metal connected in series. The stroke of these pressure sockets connected in the back is transferred to the movable core of an inductive displacement sensor via a plunger.
  • DE-A-3 127 490 discloses a pressure-tight inductive displacement transducer for a fluidic actuator.
  • the core of an inductive displacement sensor can be moved in a pressure pipe which is open on one side and can be screwed to a machine part at the open end.
  • This core is connected to a fluidic actuator (not shown there) via a connecting rod which is led out of the open end of the pressure tube.
  • the windings of the inductive displacement sensor are wound on a sleeve-like coil body, which surrounds the pressure tube and is adjustable in an outer housing relative to the pressure tube for adjustment purposes.
  • the core of the inductive displacement sensor is one of the actuator and its piston or the like. separate component.
  • US-A-2 936 614 relates to a device for measuring flows, in particular in boreholes.
  • the flow is directed through a tubular housing built into a test string.
  • a throttle body is resiliently suspended in this housing.
  • a flow-dependent force acts on this throttle body, so that the throttle body is accordingly moved in the flow direction by a flow-dependent distance.
  • a core of an inductive displacement sensor designed as a differential transformer is connected to the throttle body via a rod. The displacement sensor supplies a flow-dependent, electrical output signal.
  • the invention is based on the object of converting measured variables of a hydraulic system into an electrical signal in the simplest possible way.
  • an inductive transmitter with coils wound on the cylinder for generating a signal dependent on the position of the piston in the cylinder.
  • a piston which is acted upon directly by the pressure in the hydraulic system thus also serves as the core of an inductive transmitter.
  • the coils of the inductive sensor are wound directly on the cylinder.
  • Embodiments of the invention are the subject of the dependent claims.
  • the sensor contains a piston 10.
  • the piston 10 is movable in a cylinder 12.
  • the cylinder 12 can be connected to a hydraulic system by means of a threaded connection 14.
  • the piston 10 is made of a material with high permeability.
  • the piston 1.0 is preferably formed by a ferrite core.
  • the position of the piston 10 in the cylinder 12 is tapped by an inductive transmitter 16.
  • the induc tive encoder 16 contains coils 18, 20 and 22 which are wound on the cylinder 12.
  • the inductive transmitter 16 is a differential transformer with a pair of AC-fed primary windings 18 and 20 and a secondary winding 22.
  • the secondary winding 22 is arranged between the two primary windings 18 and 20.
  • the primary windings 18, 20 generate in the secondary winding 22 oppositely directed (or better "antiphase") power flows which change periodically with the frequency of the current changing current.
  • the frictional connections that are generated by the primary windings 18 or 20 depend on the position of the piston 10 relative to the respective primary coil 18 or 20.
  • the two force flows generated by the primary coils 18 and 20 are opposite in the same way. In this case, no output voltage is induced in the secondary coil 22. If the piston 10 deviates from this central position, one of the force flows increases while the other decreases. In the Sekundär ⁇ winding 22 is then a kol Benl ageabhfiti ge output _ * induced alternating voltage.
  • the coils 18, 20 and 22 are advantageously dimensioned such that the output change voltage is stepped up.
  • the piston 10 When used as a pressure transducer, the piston 10 is acted upon directly on one side (on the right in the figure) by the hydraulic pressure of the hydraulic system. On the. on the other side (left in the figure), the piston 10 bears against a spring element 24.
  • the spring element 24 is formed by a plurality of disc springs 26, 28, 30.
  • the spring element 24 is seated in an extension 32 of the 1 cylinder 12.
  • the spring element 14 rests on a plate 34 provided on the piston 10 and guided in the extension 32.
  • the spring lever 24 rests against a spacer 36 seated in the extension 32.
  • the pretension of the spring element 24 in the central position of the piston 10 can be predetermined by the spacer 36. This specifies the pressure, Q, which corresponds to the middle position.
  • the coils 18, 20 and 22 of the differential transformer are wound in circumferential grooves 38, 40, 42 on the outer surface of the cylinder 12. On this 5 cylinder 12 is a covering the coils 18, 20, 22
  • Two circumferential grooves 46 and 48 are formed in the inner wall of the cylinder 12. Seals 50 and 52 are arranged in these circumferential grooves 46 and 48. The piston 10 runs on these seals 50, 52.
  • a transducer of the type described can also be used in the way that the piston is connected on one side to a lifting mechanism and on the other side is acted upon by a working pressure medium for actuating the lifting mechanism.
  • the piston is then not a measuring piston but a working piston.
  • the inductive transmitter then delivers a signal which is a measure of the position of the lifting mechanism.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Un piston (10) se déplace dans un cylindre (12) pouvant être relié au système hydraulique. Un capteur par induction (16) avec des enroulements (18, 20, 22) enroulés sur le cylindre (12) génère un signal dépendant de la position du piston (10) dans le cylindre (12). En appuyant le piston (10) sur un élément à ressort (24) on obtient un absorbeur de pression.
EP19870900811 1986-02-17 1987-01-17 Capteur de mesure pour systemes hydrauliques Withdrawn EP0263115A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3605344 1986-02-17
DE19863605344 DE3605344A1 (de) 1986-02-17 1986-02-17 Messgeber fuer hydrauliksysteme

Publications (1)

Publication Number Publication Date
EP0263115A1 true EP0263115A1 (fr) 1988-04-13

Family

ID=6294488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870900811 Withdrawn EP0263115A1 (fr) 1986-02-17 1987-01-17 Capteur de mesure pour systemes hydrauliques

Country Status (3)

Country Link
EP (1) EP0263115A1 (fr)
DE (1) DE3605344A1 (fr)
WO (1) WO1987005104A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3918185A1 (de) * 1989-06-03 1990-12-06 Bosch Gmbh Robert Wegmesssystem
DE19853789C1 (de) * 1998-11-21 2000-02-03 Mtu Muenchen Gmbh Differenzdruckgeber

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB267804A (en) * 1926-08-31 1927-03-24 Brown Instr Co Improvements in and relating to manometers
US2936614A (en) * 1954-12-23 1960-05-17 Socony Mobil Oil Co Inc System for measurement of fluid flow dependent forces
US2902668A (en) * 1956-05-28 1959-09-01 Western Geophysical Co Pressure sensitive device
FR1371499A (fr) * 1963-09-30 1964-09-04 Appleby & Ireland Ltd Appareil émetteur de signaux actionné par pression
GB1285889A (en) * 1968-11-29 1972-08-16 Atomic Energy Authority Uk Improvements in differential pressure transducers
US3536932A (en) * 1969-04-10 1970-10-27 Northern Electric Co Mechanical-electrical transducer
US3956938A (en) * 1975-03-20 1976-05-18 The Bendix Corporation Pressure sensors utilizing ferromagnetic fluids
GB2049942B (en) * 1979-06-07 1983-07-20 Matsushita Electric Works Ltd Pressure transducer
DE3127470A1 (de) * 1981-07-11 1983-01-20 Robert Bosch Gmbh, 7000 Stuttgart Induktiver wegaufnehmer fuer ein fluidisches stellglied
DE3149516A1 (de) * 1981-12-14 1983-07-07 Wabco Steuerungstechnik GmbH & Co, 3000 Hannover Einrichtung zum erfassen der kolbenstellung eines zylinders
JPS6013405U (ja) * 1983-07-05 1985-01-29 株式会社　東京衡機製造所 アクチユエ−タ
US4527430A (en) * 1983-11-03 1985-07-09 The Dow Chemical Company Transducer apparatus for measuring pressure of fluids

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8705104A1 *

Also Published As

Publication number Publication date
DE3605344A1 (de) 1987-08-20
WO1987005104A1 (fr) 1987-08-27

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Inventor name: OELSCH, KURT