EP0022394B1 - Méthode et dispositif de contrôle de dégazage d'un circuit hydraulique - Google Patents

Méthode et dispositif de contrôle de dégazage d'un circuit hydraulique Download PDF

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Publication number
EP0022394B1
EP0022394B1 EP80400927A EP80400927A EP0022394B1 EP 0022394 B1 EP0022394 B1 EP 0022394B1 EP 80400927 A EP80400927 A EP 80400927A EP 80400927 A EP80400927 A EP 80400927A EP 0022394 B1 EP0022394 B1 EP 0022394B1
Authority
EP
European Patent Office
Prior art keywords
gas
liquid
reservoir
extraction
hydraulic circuit
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.)
Expired
Application number
EP80400927A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0022394A1 (fr
Inventor
Olivier Hellouin De Menibus
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.)
AMS SA
Original Assignee
AMS SA
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 AMS SA filed Critical AMS SA
Priority to AT80400927T priority Critical patent/ATE5742T1/de
Publication of EP0022394A1 publication Critical patent/EP0022394A1/fr
Application granted granted Critical
Publication of EP0022394B1 publication Critical patent/EP0022394B1/fr
Expired legal-status Critical Current

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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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding

Definitions

  • the invention relates to the degassing control of a hydraulic circuit comprising a tank subjected to a partial vacuum.
  • hydraulic circuits require a liquid free of dissolved or suspended gases.
  • suspended gases especially air, create operating disturbances such as cavitation in pumps, pressure jumps, faults in regulation, abnormal noises, etc., and even serious deterioration of the elements of the circuit: erosion by cavitation, corrosion causing seizure of materials, etc ...
  • the dissolved gases can be released at the time of expansion or during the heating of the liquid.
  • the gases can concentrate in a “pocket” at certain high points of the circuit and affect their impedance. Thus, it is often necessary or at least useful to provide for periodic degassing of the liquid from a hydraulic circuit.
  • the degassing of the hydraulic system of airplanes is very generally carried out at the same time as its depollution and its control which are carried out by means of a test bench.
  • the latter consists of an auxiliary hydraulic circuit essentially comprising a pump, filters and a fairly large tank, and connected in parallel to the pump of the circuit to be tested.
  • the auxiliary circuit pump has its own drive means.
  • the oil in the circuit to be tested is constantly in transit through the tank in the auxiliary circuit and, ultimately, degassing is achieved by connecting the top point of the tank in the auxiliary circuit to a vacuum pump and involves both the circuit to be tested. and the auxiliary circuit. In other words, this degassing takes place exactly like that of a simple hydraulic circuit with a conventional tank.
  • the first process is essentially subjective and therefore imprecise and the dissolved gases go unnoticed.
  • the second method requires the use of numerous valves (suction, non-return, compression) and results in significant variations in the volume of the fluid contained in the tank unless adding compression means (bellows, pistons, auxiliary tanks etc ...) These variations in volume make the device incompatible with the requirements to be met for a test bench and moreover is only intended to be integrated into a complete hydraulic system.
  • the device according to DE-A-2221 551 if it results in an automatic degassing stop at a predetermined degree, does not provide the degree of degassing reached at all times.
  • the invention provides a means of quantitative evaluation of the percentage of gas remaining at all times, throughout the duration of the degassing operation. It is based on the fact that the quantity of gas extracted per unit of time is a function of the total percentage of gas (dissolved or in suspension) contained in the liquid, all other conditions remaining equal (temperature, depression, free surface of liquid c ' i.e. covering section).
  • the control of the degassing of a hydraulic circuit comprising a tank whose top point is connected to a vacuum pump, in which the degassing operation is carried out while maintaining the vacuum above the liquid substantially constant is remarkable in that the degassing operation is carried out while maintaining, moreover, the temperature and the free surface of the liquid in the tank substantially constant and that the degassing control is carried out by measuring the instantaneous flow rate of the gases extracted by the pump when empty, this flow rate being a function of the total percentage of gas, dissolved and in suspension, contained in the liquid at the same time.
  • the subject of the invention is also a device for controlling the degassing of a hydraulic circuit such as as defined above, remarkable in that the section of the cover at the height of the free surface of the liquid is invariable, that a temperature regulator is provided to keep the temperature of the liquid in the cover substantially constant, and that a flow meter is placed between the tank and the vacuum pump to measure the instantaneous flow of gases extracted by the vacuum pump.
  • a flow meter graduated directly as a percentage of gas contained in the liquid for example a tube and float type flow meter. It is also possible to provide a flowmeter with flexible tab and photocell which makes it possible to automatically stop the degassing operation when the percentage of gas remaining reaches a predetermined threshold, or to warn the operator by an electric indicator or a audible signal.
  • the subject of the invention is also a test bench for a hydraulic circuit comprising a degassing device implementing the above-mentioned method.
  • a hydraulic circuit not shown, comprises a tank 10, the top point of which is connected by a pipe 11 to a vacuum pump 12.
  • a vacuum pump 12 In known manner, on the pipe 11, an oil-air separator 13 is interposed for recovery. Oil entrained by the sucked air and a branch 14 is pricked leading to a vacuum regulator 15 which determines the value of the vacuum to be respected.
  • a flow meter 16 Between the separator 13 and the connection of the regulator 15 is disposed a flow meter 16 comprising a flexible tab 17 located opposite the inlet nozzle 18 of the gases in the flow meter.
  • the amplitude of the flexion of the tongue 17 is a function of the gas flow rate.
  • the tongue 17 carries a flap 17a which, for sufficient bending of the tongue, forms a screen between a source 19a and a photoelectric cell 19b.
  • the apparatus is adjusted in such a way that for a low flow rate, corresponding to sufficient degassing, the screen 17a releases the trajectory of the excitation radius of the cell 19b and the latter then commands the stopping of the pump 12 or any other procedure for further testing.
  • the blade flow meter 16 could be replaced by a flow meter of any type, for example tube and float, and the control of the pump 12 can be only manual.
  • FIG. 2 is shown schematically, in solid lines, the hydraulic circuit of a test bench intended to be connected in parallel to the pump (not shown) of a hydraulic circuit to be tested of which it then constitutes the auxiliary circuit.
  • auxiliary circuit with its connection points 21 and 22, its cover 23, its high pressure pump with variable flow rate 24, its low pressure pumps with constant flow rates, 25 for recovery and 26 for boosting, its pneumatic pilot valve 27 and its valve force-feeding 28 is currently well known; its operation is described in detail in FR-A-2 102 488.
  • the cover 23 is equipped with a level detector 29 with float 30 and temperature compensator 31, as described in the aforementioned patent.
  • auxiliary circuit To this known auxiliary circuit is associated a degassing circuit represented in broken lines in the figure and comprising a vacuum pump 32, a vacuum regulator 33, a separator 34 and, as said above, a flow meter 35.
  • the flow meter is of the tube and float type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Flow Control (AREA)
  • Sampling And Sample Adjustment (AREA)
EP80400927A 1979-07-05 1980-06-20 Méthode et dispositif de contrôle de dégazage d'un circuit hydraulique Expired EP0022394B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80400927T ATE5742T1 (de) 1979-07-05 1980-06-20 Verfahren und vorrichtung zur kontrolle der entgasung eines hydrauliksystems.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7917496A FR2460409A1 (fr) 1979-07-05 1979-07-05 Methode et dispositif de controle de degazage d'un circuit hydraulique
FR7917496 1979-07-05

Publications (2)

Publication Number Publication Date
EP0022394A1 EP0022394A1 (fr) 1981-01-14
EP0022394B1 true EP0022394B1 (fr) 1983-12-28

Family

ID=9227562

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400927A Expired EP0022394B1 (fr) 1979-07-05 1980-06-20 Méthode et dispositif de contrôle de dégazage d'un circuit hydraulique

Country Status (4)

Country Link
EP (1) EP0022394B1 (enExample)
AT (1) ATE5742T1 (enExample)
DE (1) DE3065991D1 (enExample)
FR (1) FR2460409A1 (enExample)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE181142T1 (de) * 1992-01-23 1999-06-15 Sun Electric Systems Bv Verfahren und vorrichtung zur erkennung von ungelöstes gaz in hydraulische systemen
RU2216050C2 (ru) * 2002-02-18 2003-11-10 Томский государственный архитектурно-строительный университет Учебно-лаборатарное устройство для демонстрации работы гидроциклона
CN103196618B (zh) * 2013-03-11 2015-08-26 常州大学 石油产品全自动真空式饱和蒸气压测定器及测定方法
CN105489329B (zh) * 2015-12-18 2018-05-18 中核核电运行管理有限公司 一种抽真空充油装置
RU181048U1 (ru) * 2017-12-11 2018-07-04 Федеральное государственное бюджетное образовательное учреждение высшего образования "Томский государственный архитектурно-строительный университет" (ТГАСУ) Учебно-лабораторное устройство для изучения напорного течения жидкости

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2102488A5 (enExample) * 1970-08-05 1972-04-07 Ams
DE2221551A1 (de) * 1972-05-03 1973-11-15 Blume Geb Schsoeder Entgasungsvorrichtung
DE2643752C2 (de) * 1976-09-29 1982-05-27 Vereinigte Flugtechnische Werke Gmbh, 2800 Bremen Anordnung zur Prüfung hydraulischer Systeme

Also Published As

Publication number Publication date
FR2460409A1 (fr) 1981-01-23
DE3065991D1 (en) 1984-02-02
ATE5742T1 (de) 1984-01-15
EP0022394A1 (fr) 1981-01-14
FR2460409B1 (enExample) 1983-06-10

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