EP0134793A1 - Capteur de pression hydraulique - Google Patents

Capteur de pression hydraulique

Info

Publication number
EP0134793A1
EP0134793A1 EP84900493A EP84900493A EP0134793A1 EP 0134793 A1 EP0134793 A1 EP 0134793A1 EP 84900493 A EP84900493 A EP 84900493A EP 84900493 A EP84900493 A EP 84900493A EP 0134793 A1 EP0134793 A1 EP 0134793A1
Authority
EP
European Patent Office
Prior art keywords
housing
pressure
inner tube
pressure sensor
sensor according
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.)
Ceased
Application number
EP84900493A
Other languages
German (de)
English (en)
Inventor
Bruno Kägi
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.)
ST SENSORTECHNIK AG
Original Assignee
ST SENSORTECHNIK AG
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 ST SENSORTECHNIK AG filed Critical ST SENSORTECHNIK AG
Publication of EP0134793A1 publication Critical patent/EP0134793A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/02—Measuring force or stress, in general by hydraulic or pneumatic means

Definitions

  • the present invention relates to a hydraulic pressure transducer, in which the incompressible liquid is located in an elastic, tubular housing which can be acted upon by an external pressure and which can be connected to a pressure gauge or transducer.
  • hydraulic pressure transducers are used which are able to absorb changing external load conditions and to pass them on to suitable measuring instruments or recording means or signal converters.
  • an incompressible liquid such as water
  • a compressible housing made of, for example, rubber-like material and connectable to the measuring means.
  • OMPI liquid displaced under the inward deformation of part of the housing wall can dodge elsewhere by outward deformation on the housing wall and the pressure pulse in the liquid continues in a wave shape, the wave energy being known to be squared with the distance from the shaft center ( Pressurization point) decreases.
  • OMFI transducer housing must be expected.
  • a rigid tube extends in the interior of the tubular housing at least approximately in the center and in the longitudinal direction of the housing one end is intended for connection to the manometer or the transducer and has a plurality of radial bores distributed over the entire pipe length.
  • transverse components of the pressure wave propagating in the annular gap form new wave centers directed into the interior of the inner tube, receives the progressively decreasing wave energy in the inner tube at every point of a radial Drilling an energy pulse compensating for the energy loss.
  • the radial bores in the jacket of the inner tube have a nozzle-like diameter, and if further preferably three radial bores are each distributed in a sectional plane of the inner tube with the same angular spacing around the circumference are, such arrangements of radial holes over the entire length of the inner tube with predetermined, preferably equal distances to repeat.
  • the inside of the housing is under an overpressure of preferably at least 0.01 BAR.
  • the incompressible liquid inside the housing is water, optionally with an anti-freeze additive.
  • a structurally simple and robust design of the hydraulic pressure transducer according to the invention also results from the fact that the inner tube is supported on the end face of the housing, and that the inner tube carries a coupling piece at its connection-side end, which penetrates the one end face of the housing, and in addition that Inner tube at its end opposite the connection side is pressure-tightly closed at the end and that the closed end of the inner tube is provided with a vent screw.
  • the present invention further relates to the use of the hydraulic pressure transducer according to the invention as a step mat by arranging a plurality of such pressure transducers next to one another, which can be connected to an evaluation device.
  • the illustrated hydraulic pressure transducer initially comprises, in a known manner, an elastic outer tube 1 made of a suitable elastomer or the like, for example with a working length of 100 cm or more.
  • the cross section of the tube 1 can be any, and is assumed to be rectangular here.
  • the clear width of the pressure pick-up tube 1 can be, for example, 10 ⁇ 20 mm.
  • the tube 1 can also be glued to a base, not shown, or, for example, to a base, not shown
  • O PI Wear a longitudinal profile on the outer wall for fastening the arrangement to a floor rail.
  • the outer casing of this inner tube 2 and the inner wall of the housing 1 limit a circumferential gap 3 which is closed at its two ends by end faces 5 and 6 on the tubular housing 1.
  • the ends 8 and 10 are supported in a suitable manner on the end faces 5 and 6 mentioned in a liquid-tight manner.
  • the inner tube 2 also carries at its connection-side end 8 a suitable coupling piece 9 which expediently penetrates the relevant end face 5 of the housing 1. With this coupling piece 9, the inner tube 2 can be connected to pressure display means or evaluation devices or signal converters or the like (not shown here).
  • the inner tube 1 is closed in a pressure-tight manner, this end face of the inner tube being sealed by a ventilation screw.
  • the diameter of the inner tube 2 is relatively small and here is, for example, an outer diameter of 5 mm and an inner diameter of 4 mm.
  • these values are only examples that have led to the results mentioned in the introduction. However, any deviations in the mass are entirely possible within the scope of the invention.
  • the inner tube 2 is further provided in a manner essential to the invention with a plurality of radial bores 4. These radial bores 4 have a nozzle-like diameter of 1 mm, for example, and are distributed over the entire length of the inner tube 2.
  • the entire system described above is filled with an incompressible liquid, for example with water, optionally with an anti-freeze additive and is preferably under a prestressing pressure of 0.01 to for example 0.7 BAR in order to determine the pressure resistance of the elastic pressure sensor housing 1 heights.
  • step mat by juxtaposing a plurality of such hydraulic pressure transducers as described above and to connect the whole thing to a corresponding evaluation device, for example for orthopedics to use diagnostic means for precise measurement and recording of movement sequences in hand when walking on the step mat.
  • a corresponding evaluation device for example for orthopedics to use diagnostic means for precise measurement and recording of movement sequences in hand when walking on the step mat.
  • the loads on the ankles or other pressure-generating processes can be checked.
  • Such a system is no less important for veterinary medicine, for example in order to measure and record the load pressure on the hooves of animals, such as horses, which are passed over the step mat.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

Le capteur de pression hydraulique, le liquide incompressible se situant dans un boîtier (1) tubulaire élastique pouvant être percuté par une pression extérieure, entoure un tuyau rigide (2) s'étendant à l'intérieur du boîtier tubulaire (1) au moins approximativement au milieu et dans la direction de la longueur du boiter; l'enveloppe de ce tuyau délimite avec la paroi intérieure du boîtier une fente périphérique (3) obturée sur ses deux cotés avant (5, 6), le tuyau intérieur (2) ayant une des ses extrémités (8) destinée à être raccordée à un manomètre ou à un transformateur et possédant une multitude de trous radiaux (4) répartis sur toute la longueur du tuyau. On a remarqué que, de cette manière, dans le cas de boîtiers de capteurs de pression pratiquement de n'importe quelle longueur et d'une pression percutant le boîtier à n'importe quel endroit, ou obtient toujours les mêmes valeurs mesurées relatives pour les mêmes pressions.
EP84900493A 1983-01-31 1984-01-30 Capteur de pression hydraulique Ceased EP0134793A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH527/83A CH658726A5 (de) 1983-01-31 1983-01-31 Hydraulischer druckaufnehmer.
CH527/83 1983-01-31

Publications (1)

Publication Number Publication Date
EP0134793A1 true EP0134793A1 (fr) 1985-03-27

Family

ID=4189044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84900493A Ceased EP0134793A1 (fr) 1983-01-31 1984-01-30 Capteur de pression hydraulique

Country Status (5)

Country Link
US (1) US4604901A (fr)
EP (1) EP0134793A1 (fr)
CA (1) CA1211027A (fr)
CH (1) CH658726A5 (fr)
WO (1) WO1984002977A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4838093A (en) * 1987-12-11 1989-06-13 Gmi Engineering & Management Institute Flow meter and method of measuring flow
CN1306171C (zh) * 2004-07-06 2007-03-21 许宏 一种无源的流体动力控制方法及其控制系统
US7401522B2 (en) * 2005-05-26 2008-07-22 Rosemount Inc. Pressure sensor using compressible sensor body
US7870791B2 (en) 2008-12-03 2011-01-18 Rosemount Inc. Method and apparatus for pressure measurement using quartz crystal
US8327713B2 (en) 2008-12-03 2012-12-11 Rosemount Inc. Method and apparatus for pressure measurement using magnetic property
US7954383B2 (en) * 2008-12-03 2011-06-07 Rosemount Inc. Method and apparatus for pressure measurement using fill tube
US8429978B2 (en) 2010-03-30 2013-04-30 Rosemount Inc. Resonant frequency based pressure sensor
US8234927B2 (en) 2010-06-08 2012-08-07 Rosemount Inc. Differential pressure sensor with line pressure measurement
US8132464B2 (en) 2010-07-12 2012-03-13 Rosemount Inc. Differential pressure transmitter with complimentary dual absolute pressure sensors
US8752433B2 (en) 2012-06-19 2014-06-17 Rosemount Inc. Differential pressure transmitter with pressure sensor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2261027A (en) * 1939-12-14 1941-10-28 Manning Maxwell & Moore Inc Guard device for pressure-responsive instruments
DE1012477B (de) * 1955-07-28 1957-07-18 J C Eckardt A G Druckmessgeraet mit einem besonderen, mit Fluessigkeit gefuellten rohrfoermigen Druckuebertrager
CH597595A5 (fr) * 1974-07-17 1978-04-14 Haenni & Cie Ag
US4052903A (en) * 1976-12-06 1977-10-11 Thor Instrument Company, Inc. Pressure sensor
NL7907774A (nl) * 1979-10-22 1981-04-24 Arnoldus Theodorus Maria Van D Gewapende cervixdilatatie en weerstandsmeting-ballon.
US4331156A (en) * 1980-03-28 1982-05-25 University Patents, Inc. Esophageal cardiac pulse monitoring apparatus and method
GB2076293A (en) * 1980-05-20 1981-12-02 Craig Med Prod Ltd A device for developing control of sphincter-type muscles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8402977A1 *

Also Published As

Publication number Publication date
CA1211027A (fr) 1986-09-09
US4604901A (en) 1986-08-12
WO1984002977A1 (fr) 1984-08-02
CH658726A5 (de) 1986-11-28

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19840920

AK Designated contracting states

Designated state(s): AT BE DE FR GB LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ST SENSORTECHNIK AG

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KAEGI, BRUNO

17Q First examination report despatched

Effective date: 19860422

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19870131

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KAEGI, BRUNO