EP1554560A2 - Systeme et procede pour determiner la teneur en air, l'aptitude au degagement d'air et la formation de mousse a la surface d'huiles - Google Patents

Systeme et procede pour determiner la teneur en air, l'aptitude au degagement d'air et la formation de mousse a la surface d'huiles

Info

Publication number
EP1554560A2
EP1554560A2 EP03758039A EP03758039A EP1554560A2 EP 1554560 A2 EP1554560 A2 EP 1554560A2 EP 03758039 A EP03758039 A EP 03758039A EP 03758039 A EP03758039 A EP 03758039A EP 1554560 A2 EP1554560 A2 EP 1554560A2
Authority
EP
European Patent Office
Prior art keywords
oil
air
differential pressure
mixer
measuring
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Withdrawn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
EP03758039A
Other languages
German (de)
English (en)
Inventor
Magnus Leinemann
Arthur Wetzel
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen 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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP1554560A2 publication Critical patent/EP1554560A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
    • G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
    • G01N11/08—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by measuring pressure required to produce a known flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2835—Specific substances contained in the oils or fuels
    • G01N33/2841—Gas in oils, e.g. hydrogen in insulating oils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G01N2013/0241—Investigating surface tension of liquids bubble, pendant drop, sessile drop methods
    • G01N2013/025—Measuring foam stability
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids

Definitions

  • the invention relates to a device for determining the air content, the air separation behavior and the surface foam formation of oils, in particular gear oils, with the features of the preamble of claim 1 and a method for operating a device for determining the air content, the air separation behavior and the surface foam formation of oils. in particular gear oils, with the features of the preambles of claims 11, 12, 13.
  • Oil / air dispersions in gear oil lead to reduced efficiency of gearboxes and in extreme cases can lead to oil leaks.
  • the ability of the oil to quickly separate the incorporated air is therefore an important quality criterion and measuring systems for determining the air separation behavior (LAV) of oils are therefore of great importance.
  • a device for determining the air separation behavior of oils with an air-oil mixer and a differential pressure sensor is known from Castrol.
  • the air-oil mixer has a container that can be partially filled with oil and has a glass front with a propeller that is only slightly submerged in the oil.
  • the propeller can be raised to 10,000 rpm and swirls the oil.
  • Different hydrostatic pressures and the difference between them determine the air content in the oil via two superimposed pressure measuring points.
  • a disadvantage of this State of the art is the little practical, high metrological effort, such as precisely manufactured pressure connections and very finely resolved differential pressure transducers, due to the low pressure differences to be resolved.
  • the oil rotating in this prior art exerts additional pressure on the measuring points. Thus must the sample after the 'air entry is first brought to rest, resulting in delayed data acquisition.
  • Such LAV measuring systems do not fully correlate with the situation in the transmission.
  • the object of the invention is to provide a device for determining the air content, the air separation behavior and the surface foam formation of oils, in particular gear oils, with early measurement value acquisition and a practical method for operating a device for determining the air content, the air separation behavior and the surface foam formation of ' Specify oils, especially gear oils, with early data acquisition.
  • the solution is achieved with a device for determining the air content, the air separation behavior and the surface foam formation of oils, in particular gear oils, with the features of claim 1 and with a method for operating a device for determining the air content, the air separation behavior and the surface foam formation of oils, in particular of. gear oils, with the features of claims 11, 12 and 13.
  • Advantageous embodiments of the invention are shown in the subclaims.
  • a device for determining the air content, the air separation behavior and the surface foam formation of oils, in particular gearboxes oil provided with an air-oil mixer and a differential pressure transducer.
  • a delivery device is provided, which delivers the oil through pipes of the air-oil mixer.
  • a compressed air connection conveys air into the pipes of the air-oil mixer.
  • the differential pressure sensor detects differential pressures in the oil via at least two bores on a Venturi tube that are spaced apart from one another in the direction of oil flow. The venturi generates' differential pressures due to change in cross-sectional area that are to the respective density of the oil proportional.
  • the density of the oil and thus its air content can be determined from the measured differential pressures.
  • the flow rate results from the volume flow set on the conveyor and the cross-sectional conditions in the Venturi tube.
  • the device according to the invention results in a substantially larger measuring range for the differential pressure, and the measurement resolution is therefore easier to carry out.
  • the change in the density of the oil ie its changing air content and thus the air separation behavior of the oil, can be determined.
  • the volume of the surface foam (ml) can be recorded using a collecting container (glass ball).
  • the compressed air connection can be controlled, so that the supply of air can be switched off.
  • a mixer is provided for the intensive turbulent mixing of the air with the oil in the pipes.
  • At least one separator in the form of a volume vessel is provided in the pipelines, so that larger air bubbles can be separated in the venturi tube in front of the measuring section when the air supply is open and there is a large excess of air of approx , Large air bubbles with a ⁇ > 4 mm in particular could otherwise falsify the measured differential pressure if, for. B. an air bubble would just pass through the measuring parts in the Venturi tube and there would be dispersion at the measuring point in front of it, which would lead to large differential pressures and could prevent stable measured values in the long run.
  • the separator has a diameter of approximately 20 mm or preferably approximately 30 mm.
  • the air-oil mixer is provided with a collecting container for surface foam.
  • a temperature for different test temperatures There is a removable container with an aluminum plate on the front and the air-oil mixer and the pipes can be arranged with the venturi tube in the adjustable container so that the measuring circuit can be tempered using an oil bath.
  • a circulating thermostat is provided for the temperature-controllable container, which makes the oil bath in the container heatable to 200 ° C.
  • an A / D converter card and a computer are provided and the differential pressure sensor is connected to the computer via the A / D converter card, so that the measurements can be carried out automatically.
  • the delivery device is designed as a gear pump with a maximum volume flow of 3 607 ml / min and thermal stability up to 130 ° C.
  • ⁇ In accordance with the invention is a method for the determination of the air content at various flow rates with the inventive apparatus characterized by filling of preferably 150 ml of the test oil over the volume of the vessel in the air-oil mixers, turning on a water-jet pump so that oil in hoses or . is sucked in a viewing window above a measuring cell of the differential pressure sensor, preventing the oil in the hoses above the measuring cell from re-heating, switching on the delivery device, filling in further oil to be checked until the pipelines of the air-oil mixer are filled without bubbles, adjusting the Air supply and placing the conveyor direction (e.g. 3 400 ml / min) to maximum flow, pumping over the oil to be tested and measuring the differential pressure after 7 min of air supply.
  • the inventive apparatus characterized by filling of preferably 150 ml of the test oil over the volume of the vessel in the air-oil mixers, turning on a water-jet pump so that oil in hoses or . is sucked in
  • the method for determining the air separation behavior with the device according to the invention is characterized by filling preferably 150 ml of the oil to be tested via the volume vessel into the air-oil mixer, switching on a water jet pump, so that oil enters the hoses or viewing window above a measuring cell of the differential pressure sensor is sucked, preventing the oil in the hoses or viewing windows above the measuring cell from being re-heaved, switching on the delivery device, filling in more oil to be checked until the pipelines of the air-oil mixer are filled without bubbles, adjusting the delivery device to one determined flow for 7 min with air intake, measuring the differential pressure, stopping the air supply, timing and measuring the respective differential pressure at regular intervals.
  • another method for determining the Lucasabscheide s with the inventive apparatus characterized by filling preferably '150 ml of the funnel to be tested oil through the fill in the air-oil mixers, turning on a water-jet pump so that oil, into tubes above a measuring cell of the differential pressure transducer is sucked, preventing the oil from flowing back into the hoses above the measuring cell, switching on the delivery device, filling in more oil to be checked until the pipelines of the air-oil mixer are filled without bubbles, regulating the air supply, if necessary via two needle valves Setting the conveyor to a specific flow for 7 minutes, Measuring the differential pressure, stopping the air supply, timing and measuring the differential pressure at regular intervals.
  • the temperature of the oil to be tested is set via the thermostats set about 20 ° C higher; defined for 90 ° C and 130 ° C.
  • Fig. 1 is a front view of the device according to the invention.
  • Fig. 2 is a diagram with the device according to the invention detected differential pressures for an oil to be tested.
  • a device 1 for determining the air separation behavior of gear oils is provided with an air-oil mixer 2 and a differential pressure sensor 3.
  • a conveyor 4 is provided as a gear pump with a maximum volume flow of 3 607 ml / min and thermal stability up to 130 ° C., which sucks the oil through pipes 5 of the air-oil mixer 2.
  • All metal-made parts of the device 1 are made of V2A stainless steel.
  • plastic such as seals, hoses, etc.
  • PTFE or FKM is used and for these parts, as in the pump head, the Gear pump, no silicone-containing materials used.
  • a compressed air connection 6 feeds air into the pipelines 5 of the air-oil mixer 2 via needle valves (not shown).
  • the compressed air connection 6 can be controlled, so that the supply of air can be switched off.
  • the differential pressure sensor 3 detects the differential pressures in the oil 2 in the conveying direction of the oil .vonence spaced bores 7, (not shown) 8 on a venturi '9 and via hoses 12, 13.
  • a mixer is provided to intensive turbulent mixing of the air with the oil in the pipes 5.
  • a separator 15 in the form of a volume vessel is provided in the pipelines 5, so that when the air supply is open and there is a large excess of air of approx. 6 l / min air in 150 ml oil, larger air bubbles can be separated in the Venturi tube 9 in front of the measuring section.
  • the separator 15 has a diameter of 30 mm.
  • the air-oil mixer 2 is provided with a collecting container 14.
  • a temperature-controlled container with a glass or steel plate is provided on the front, and the air-oil mixer 2 and the pipelines 5 are arranged with the Venturi tube 9 in a temperature-controlled container (not shown) in such a way that the measuring circuit via a Oil bath can be tempered in the temperature-controlled container.
  • a circulation thermostat is provided for the temperature-controlled container, which makes the oil bath in the container heatable to 200 ° C.
  • An A / D converter card (not shown) and a computer 12 are connected to the differential pressure sensor 3 so that the measurements can be carried out automatically.
  • Method for operating the device 1 A method for.
  • the air content at constant volume flows is determined with the device 1 by pouring 150 ml of the oil to be tested into the air-oil mixer 2 via the volume vessel, switching on a water jet pump (not shown), so that oil enters the hoses or viewing window 12 , 13 is sucked above the differential pressure sensor 3 designed as a measuring cell.
  • the backflow of the oil in the hoses 12, 13 is prevented by closing the plug valves.
  • the conveyor 4 is switched on, further oil to be tested is filled in until the pipelines of the air-oil mixer are filled without bubbles, the air supply is adjusted and the conveyor is set to 3,400 ml / min. Pumping over the oil to be tested takes 7 minutes and. then the display of the differential device is noted.
  • the conveying device 4 sucks the oil to be checked clockwise through the pipelines 5 and can pump with an air intake, so that separate rules for the air supply can be omitted.
  • the device 1 Before the measurements are evaluated, the device 1 is preferably to be calibrated with water, with a fitting function which can be applied to the evaluation algorithm being determined with at least two series of measurements. With more the fitting function can be improved as two series of measurements.
  • the oil to be tested has to be pumped for 7 minutes at the maximum volume flow to be set with the air supply open and then the first measured value is recorded and then all volume flows to be set must be measured quickly, whereby in addition to the differential pressures, the temperature of the test item Oil is to be absorbed.
  • the temperature of the oil to be tested is set using the thermostats in the tank, which are set about 20 ° C higher.
  • the oil to be tested is mixed for 7 minutes with the air supply open and then the differential pressure is recorded and the air supply is stopped. Then the timing begins and the differential pressure is recorded at regular intervals.
  • Fig. 2 '
  • the differential pressures recorded with the device 1 are plotted in an upper row of points for an oil to be tested with defoamer and in a lower row without defoamer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Measuring Volume Flow (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Nozzles (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un système (1) servant à déterminer la teneur en air, l'aptitude au dégagement d'air et la formation de mousse à la surface d'huiles, notamment d'huiles pour engrenages, ce système comprenant un mélangeur d'air et d'huile (2) et un capteur de pression différentielle (3). Selon l'invention, le système (1) comprend en outre un dispositif d'acheminement (4) qui achemine l'huile à travers des canalisations (5) du mélangeur d'air et d'huile (2), une alimentation en air comprimé (6) qui achemine de l'air dans les canalisations (5) du mélangeur d'air et d'huile (2), ainsi qu'un tube de Venturi (9) monté dans une des canalisations (5). Par ailleurs, le capteur de pression différentielle (3) capte des pressions différentielles dans l'huile par l'intermédiaire d'au moins deux trous (7, 8) ménagés dans le tube de Venturi (9) à distance l'un de l'autre dans le sens d'acheminement de l'huile.
EP03758039A 2002-10-26 2003-10-22 Systeme et procede pour determiner la teneur en air, l'aptitude au degagement d'air et la formation de mousse a la surface d'huiles Withdrawn EP1554560A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10249957 2002-10-26
DE10249957A DE10249957A1 (de) 2002-10-26 2002-10-26 Vorrichtung und Verfahren zur Bestimmung des Luftgehalts und des Luftabscheideverhaltens von Ölen
PCT/EP2003/011684 WO2004038386A2 (fr) 2002-10-26 2003-10-22 Systeme et procede pour determiner la teneur en air, l'aptitude au degagement d'air et la formation de mousse a la surface d'huiles

Publications (1)

Publication Number Publication Date
EP1554560A2 true EP1554560A2 (fr) 2005-07-20

Family

ID=32087215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03758039A Withdrawn EP1554560A2 (fr) 2002-10-26 2003-10-22 Systeme et procede pour determiner la teneur en air, l'aptitude au degagement d'air et la formation de mousse a la surface d'huiles

Country Status (4)

Country Link
US (1) US7395694B2 (fr)
EP (1) EP1554560A2 (fr)
DE (1) DE10249957A1 (fr)
WO (1) WO2004038386A2 (fr)

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DE102005053417B4 (de) * 2005-11-07 2007-08-09 Hydac Filtertechnik Gmbh Vorrichtung zum Ermitteln der Filtrierbarkeit von Fluiden, insbesondere von Getriebeölen
US10241103B2 (en) * 2016-05-16 2019-03-26 Ayalytical Instruments, Inc. Foam testing apparatus
CN107449641B (zh) * 2017-09-16 2023-12-01 中国地质大学（武汉） 一种无间断连续收集页岩解吸气的装置和方法
CN107449693B (zh) * 2017-09-16 2023-12-01 中国地质大学（武汉） 一种基于无间断连续收集计算页岩含气量的装置和方法
CN108801900A (zh) * 2018-06-29 2018-11-13 中国神华能源股份有限公司 弯曲管柱内部泥浆润滑性检测装置及方法

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Also Published As

Publication number Publication date
WO2004038386A3 (fr) 2004-07-08
US7395694B2 (en) 2008-07-08
US20060162430A1 (en) 2006-07-27
DE10249957A1 (de) 2004-05-06
WO2004038386A2 (fr) 2004-05-06

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