EP0022394B1 - Method and device for controlling the degassing of a hydraulic circuit - Google Patents
Method and device for controlling the degassing of a hydraulic circuit Download PDFInfo
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000007872 degassing Methods 0.000 title description 24
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000000725 suspension Substances 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims abstract 13
- 238000012544 monitoring process Methods 0.000 claims abstract 6
- 239000007789 gas Substances 0.000 description 18
- 238000012360 testing method Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
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)
- Sampling And Sample Adjustment (AREA)
- Flow Control (AREA)
Abstract
Description
L'invention concerne le contrôle de dégazage d'un circuit hydraulique comportant une bâche soumise à un vide partiel.The invention relates to the degassing control of a hydraulic circuit comprising a tank subjected to a partial vacuum.
De façon générale les circuits hydrauliques nécessitent un liquide exempt de gaz dissous ou en suspension. En effet, les gaz en suspension, notamment l'air, créent des perturbations de fonctionnement telles que cavitation dans les pompes, sauts de pression, défauts dans la régulation, bruits anormaux, etc..., et même des détériorations graves des éléments du circuit : érosion par cavitation, corrosion entraînant le grippage des matériaux, etc... Les gaz dissous peuvent se libérer au moment de la détente ou au cours de l'échauffement du liquide. Enfin, les gaz peuvent se concentrer en « poche en certains points hauts du circuit et en affecter l'impédance. Ainsi, il est souvent nécessaire ou au moins utile de prévoir le dégazage périodique du liquide d'un circuit hydraulique.In general, hydraulic circuits require a liquid free of dissolved or suspended gases. Indeed, 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. Finally, 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.
Cette opération devient indispensable pour les circuits hydrauliques des avions pour des raisons de sécurité. Tout d'abord, ces circuits comportent des composants très sensibles au manque d'homogénéité du liquide. Ensuite, dans les avions modernes, les deux étages (haute et basse pression) des bâches sont entièrement clos et l'air entrant, en quantités infimes mais de façon continue, par les raccords et les joints de sécurité, ne peut se séparer de l'huile dans la bâche comme cela se produit partiellement dans les réservoirs conventionnels où un gaz se trouve au-dessus du niveau du liquide. Enfin, les temps de réponse des organes commandés par le circuit sont directement influencés par l'impédance dudit circuit et doivent cependant rester dans des limites précises.This operation becomes essential for aircraft hydraulic systems for safety reasons. First of all, these circuits include components very sensitive to the lack of homogeneity of the liquid. Then, in modern airplanes, the two stages (high and low pressure) of the tarpaulins are completely closed and the incoming air, in minute quantities but continuously, through the fittings and the safety seals, cannot separate from the oil in the tarpaulin as partially occurs in conventional tanks where a gas is above the level of the liquid. Finally, the response times of the organs controlled by the circuit are directly influenced by the impedance of said circuit and must however remain within precise limits.
Le dégazage du circuit hydraulique des avions s'effectue très généralement en même temps que sa dépollution et son contrôle qui sont réalisés au moyen d'un banc d'essai. Ce dernier se compose d'un circuit hydraulique auxiliaire comportant essentiellement une pompe, des filtres et une bâche d'assez grand volume, et raccordé en parallèle sur la pompe du circuit à tester. La pompe du circuit auxiliaire a son propre moyen d'entraînement. L'huile du circuit à tester transite en permanence par la bâche du circuit auxiliaire et, en définitive, le dégazage est réalisé en raccordant le point haut de la bâche du circuit auxiliaire à une pompe à vide et intéresse à la fois le circuit à tester et le circuit auxiliaire. En d'autres termes, ce dégazage s'effectue exactement comme celui d'un circuit hydraulique simple avec réservoir conventionnel.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.
Dans tous les cas il est important de savoir si le dégazage est suffisant ou non. Dans le cas d'un dégazage permanent sur un circuit simple on peut alors faire varier en conséquence la dépression créée dans la bâche par la pompe à vide. Dans le cas d'un dégazage périodique sur banc d'essai avec circuit auxiliaire, on détermine ainsi le moment où l'opération peut être arrêtée.In all cases it is important to know whether the degassing is sufficient or not. In the case of permanent degassing on a simple circuit, the depression created in the tank by the vacuum pump can therefore be varied accordingly. In the case of periodic degassing on a test bench with an auxiliary circuit, this determines the moment when the operation can be stopped.
Actuellement pour contrôler que la quantité de gaz contenue dans le liquide est suffisamment faible on dispose de deux procédés. A savoir un procédé visuel consistant à insérer sur la canalisation de retour à la bâche une capacité à paroi transparente à travers laquelle l'opérateur peut évaluer la densité, en nombre, des bulles de gaz visibles contenues dans l'huile et arrêter l'opération lorsqu'il juge que ce nombre est inférieur à une certaine valeur. Ou encore un procédé automatique, notamment lorsque le dispositif de dégazage est intégré dans le système hydraulique, tel que décrit dans le DE-A-2 221 551 et qui consiste à maintenir sensiblement constante, à une valeur prédéterminée, la dépression au-dessus du liquide, dans une bâche dont le point haut est relié à une pompe à vide avec interposition d'un régulateur de dépression et commande de la pompe à vide par un interrupteur à pression. Le premier procédé est essentiellement subjectif donc imprécis et les gaz dissous passent inaperçus. Le second procédé nécessite l'utilisation de nombreux clapets (d'aspiration, de non-retour, de compression) et entraîne des variations importantes du volume du fluide contenu dans la bâche à moins d'adjoindre des moyens de compression (soufflets, pistons, réservoirs auxiliaires etc...) Ces variations de volume rendent le dispositif incompatible avec les impératifs à respecter pour un banc d'essai et d'ailleurs n'est prévu que pour être intégré dans un système hydraulique complet. En outre le dispositif selon DE-A-2221 551, s'il conduit à un arrêt automatique du dégazage à un degré prédéterminé ne fournit pas le degré de dégazage atteint à chaque instant.Currently, two methods are available to check that the quantity of gas contained in the liquid is sufficiently low. Namely a visual process consisting in inserting on the return line to the tank a capacity with transparent wall through which the operator can evaluate the density, in number, of the visible gas bubbles contained in the oil and stop the operation when it judges that this number is less than a certain value. Or again an automatic process, in particular when the degassing device is integrated in the hydraulic system, as described in DE-A-2 221 551 and which consists in maintaining substantially constant, at a predetermined value, the vacuum above the liquid, in a tank whose high point is connected to a vacuum pump with the interposition of a vacuum regulator and control of the vacuum pump by a pressure switch. 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. In addition, 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.
L'invention fournit un moyen d'évaluation quantitative du pourcentage de gaz restant à chaque instant, pendant toute la durée de l'opération de dégazage. Elle est basée sur le fait que la quantité de gaz extraite par unité de temps est fonction du pourcentage total de gaz (dissous ou en suspension) contenu dans le liquide, toutes autres conditions restant égales (température, dépression, surface libre de liquide c'est-à-dire section de la bâche).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).
Selon l'invention le contrôle du dégazage d'un circuit hydraulique comportant une bâche dont le point haut est relié à une pompe à vide, dans laquelle l'opération de dégazage s'effectue en maintenant la dépression au-dessus du liquide sensiblement constante est remarquable en ce que l'opération de dégazage s'effectue en maintenant, en outre, la température et la surface libre du liquide dans la bâche sensiblement constantes et que le contrôle de dégazage est réalisé en mesurant le débit instantané des gaz extraits par la pompe à vide, ce débit étant fonction du pourcentage total de gaz, dissous et en suspension, contenu dans le liquide au même instant.According to the invention, 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.
L'invention a encore pour objet un dispositif de contrôle de dégazage d'un circuit hydraulique tel que défini ci-avant, remarquable en ce que la section de la bâche à la hauteur de la surface libre du liquide est invariable, qu'un régulateur de température est prévu pour maintenir la température du liquide dans la bâche sensiblement constante, et qu'un débitmètre est disposé entre la bâche et la pompe à vide pour mesurer le débit instantané des gaz extraits par la pompe à vide.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.
Pour une installation donnée, avec une bâche donnée, dans laquelle l'opération s'effectue dans des conditions déterminées de température et de dépression, il est alors possible d'utiliser un débitmètre gradué directement en pourcentage de gaz contenu dans le liquide, par exemple un débitmètre du type à tube et flotteur. Il est encore possible de prévoir un débitmètre à languette flexible et cellule photo-électrique qui permet de stopper automatiquement l'opération de dégazage lorsque le pourcentage de gaz restant atteint un seuil prédéterminé, ou d'avertir l'opérateur par un voyant électrique ou un signal sonore.For a given installation, with a given tank, in which the operation is carried out under determined conditions of temperature and vacuum, it is then possible to use 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.
L'invention a encore pour objet un banc d'essai pour circuit hydraulique comportant un dispositif de dégazage mettant en oeuvre la méthode susmentionnée.The subject of the invention is also a test bench for a hydraulic circuit comprising a degassing device implementing the above-mentioned method.
L'invention sera mieux comprise à la lecture de la description qui va suivre et à l'examen du dessin annexé dans lequel :
- la figure 1 est un schéma d'un système de contrôle de dégazage à languette flexible,
- la figure 2 montre schématiquement un banc d'essai pour circuit hydraulique avec régulateur de niveau à compensation thermique et contrôle de dégazage par débitmètre à tube.
- FIG. 1 is a diagram of a degassing control system with flexible tab,
- FIG. 2 schematically shows a test bench for a hydraulic circuit with level regulator with thermal compensation and degassing control by tube flow meter.
A la figure 1 un circuit hydraulique non représenté comporte une bâche 10 dont le point haut est raccordé par une canalisation 11 à une pompe à vide 12. De façon connue, sur la canalisation 11, est intercalé un séparateur huile-air 13 pour la récupération de l'huile entraînée par l'air aspiré et est piquée une dérivation 14 conduisant à un régulateur de dépression 15 qui détermine la valeur du vide à respecter. Entre le séparateur 13 et le raccordement du régulateur 15 est disposé un débitmètre 16 comportant une languette flexible 17 située en regard de la buse d'entrée 18 des gaz dans le débitmètre. Ainsi, l'amplitude de la flexion de la languette 17 est fonction du débit des gaz. A son extrémité supérieure libre la languette 17 porte un rabat 17a qui, pour une flexion suffisante de la languette vient former écran entre une source 19a et une cellule photo-électrique 19b. L'appareil est réglé de façon telle que pour un débit faible, correspondant à un dégazage suffisant, l'écran 17a dégage la trajectoire du rayon d'excitation de la cellule 19b et cette dernière commande alors l'arrêt de la pompe 12 ou toute autre procédure pour la poursuite des essais. Bien entendu, le débitmètre à lame 16 pourrait être remplacé par un débitmètre de type quelconque, par exemple à tube et flotteur, et la commande de la pompe 12 peut être uniquement manuelle.In FIG. 1, a hydraulic circuit, not shown, comprises a
A la figure 2 est représenté schématiquement, en traits pleins, le circuit hydraulique d'un banc d'essai destiné à être raccordé en parallèle sur la pompe (non représentée) d'un circuit hydraulique à tester dont il constitue alors le circuit auxiliaire. Un tel circuit auxiliaire avec ses points 21 et 22 de raccordement, sa bâche 23, sa pompe haute pression à débit variable 24, ses pompes basse pression à débits constants, 25 de reprise et 26 de gavage, sa vanne pneumatique pilotée 27 et sa soupape de gavage 28 est actuellement bien connue ; son fonctionnement est décrit de façon détaillée dans le FR-A-2 102 488. La bâche 23 est équipée d'un détecteur de niveau 29 avec flotteur30 et compensateur de température 31, comme décrit dans le brevet susmentionné. A ce circuit auxiliaire connu est associé un circuit de dégazage représenté en traits interrompus sur la figure et comportant une pompe à vide 32, un régulateur de dépression 33, un séparateur 34 et, comme il a été dit ci-avant, un débitmètre35. Dans l'exemple représenté, le débitmètre est du type à tube et flotteur.In 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. Such an auxiliary circuit with its
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80400927T ATE5742T1 (en) | 1979-07-05 | 1980-06-20 | METHOD AND DEVICE FOR CONTROL OF DEGASSING OF A HYDRAULIC SYSTEM. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7917496 | 1979-07-05 | ||
| FR7917496A FR2460409A1 (en) | 1979-07-05 | 1979-07-05 | METHOD AND DEVICE FOR CONTROLLING DEGASSING OF A HYDRAULIC CIRCUIT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0022394A1 EP0022394A1 (en) | 1981-01-14 |
| EP0022394B1 true EP0022394B1 (en) | 1983-12-28 |
Family
ID=9227562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80400927A Expired EP0022394B1 (en) | 1979-07-05 | 1980-06-20 | Method and device for controlling the degassing of a hydraulic circuit |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0022394B1 (en) |
| AT (1) | ATE5742T1 (en) |
| DE (1) | DE3065991D1 (en) |
| FR (1) | FR2460409A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0552841B1 (en) * | 1992-01-23 | 1999-06-09 | Sun Electric Systems B.V. | Method and device for detecting undissolved gas in a hydraulic control system |
| CN103196618B (en) * | 2013-03-11 | 2015-08-26 | 常州大学 | Petroleum products fully automatic vacuum formula saturated vapour pressure analyzer and assay method |
| CN105489329B (en) * | 2015-12-18 | 2018-05-18 | 中核核电运行管理有限公司 | One kind vacuumizes device for filling oil |
| RU181048U1 (en) * | 2017-12-11 | 2018-07-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Томский государственный архитектурно-строительный университет" (ТГАСУ) | EDUCATIONAL AND LABORATORY DEVICE FOR STUDYING THE HEAD FLOW OF A LIQUID |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2102488A5 (en) * | 1970-08-05 | 1972-04-07 | Ams | |
| DE2221551A1 (en) * | 1972-05-03 | 1973-11-15 | Blume Geb Schsoeder | DEGASSING DEVICE |
| DE2643752C2 (en) * | 1976-09-29 | 1982-05-27 | Vereinigte Flugtechnische Werke Gmbh, 2800 Bremen | Arrangement for testing hydraulic systems |
-
1979
- 1979-07-05 FR FR7917496A patent/FR2460409A1/en active Granted
-
1980
- 1980-06-20 EP EP80400927A patent/EP0022394B1/en not_active Expired
- 1980-06-20 DE DE8080400927T patent/DE3065991D1/en not_active Expired
- 1980-06-20 AT AT80400927T patent/ATE5742T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE3065991D1 (en) | 1984-02-02 |
| ATE5742T1 (en) | 1984-01-15 |
| FR2460409A1 (en) | 1981-01-23 |
| EP0022394A1 (en) | 1981-01-14 |
| FR2460409B1 (en) | 1983-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2321624B1 (en) | Method and device for detecting leaks in an underground liquid pipe, particularly a water pipe | |
| CA2548900C (en) | Process and system for checking the tightness of a device used to store gaseous fuel at high pressure | |
| FR2558521A1 (en) | APPARATUS FOR DETECTING GAS IN UNDERGROUND WELLS | |
| US20140130578A1 (en) | Method and apparatus for continuously monitoring interstitual regions in gasoline storage facilities and pipelines | |
| FR2705734A1 (en) | Method and device for improving the safety of fluid filters. | |
| US5092988A (en) | System for monitoring injection water quality using filtration, pressure regulation and mass measuring | |
| US5157958A (en) | Method for testing a leak detector | |
| EP0022394B1 (en) | Method and device for controlling the degassing of a hydraulic circuit | |
| CN113405912A (en) | Intrinsically safe high-purity high-pressure hydrogen environment material compatibility testing system and method | |
| KR101623012B1 (en) | Pressure measuring apparatus of vapor recovery pipe and operating method thereof | |
| US4880449A (en) | Compressor seal oil degassing tank vent gas recovery by method of level control | |
| US5376163A (en) | Filter system | |
| BE1013305A5 (en) | Distribution of installation of liquid hydrocarbons equipped with vapor recovery means. | |
| EP0194955B1 (en) | Device for taking and preparing a gas sample for its analysis | |
| US3673871A (en) | Portable liquid gas sampler system | |
| JP4137330B2 (en) | Liquid flow meter test equipment | |
| FR2572530A1 (en) | Automatic apparatus for measuring vaporised fractions of pure and/or mixed bodies and the densities of the liquid and/or vapour phases with withdrawal of samples in the vapour phase | |
| US4289018A (en) | Method and apparatus for measuring degasification | |
| JPH09145525A (en) | Leak detector and detection method | |
| EP0066443A1 (en) | Liquid sampling | |
| WO2023020797A1 (en) | Sensor for determining a liquid level for an aircraft tank, tank-and-sensor assembly, method for using such a sensor | |
| US4831875A (en) | Water trap valve for fail safe operation of an air inleakage monitoring system in a steam turbine | |
| JPS5920681Y2 (en) | sample collection device | |
| FR2694631A1 (en) | Method and device for determining the phase of a compressed gas; method and device for transferring a compressed gas implementing them. | |
| FR2735234A1 (en) | Hose tightness checking appts for automotive industry |
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 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH DE GB IT LU NL SE |
|
| 17P | Request for examination filed |
Effective date: 19810209 |
|
| ITF | It: translation for a ep patent filed | ||
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH DE GB IT LI LU NL SE |
|
| REF | Corresponds to: |
Ref document number: 5742 Country of ref document: AT Date of ref document: 19840115 Kind code of ref document: T |
|
| REF | Corresponds to: |
Ref document number: 3065991 Country of ref document: DE Date of ref document: 19840202 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| ITTA | It: last paid annual fee | ||
| EPTA | Lu: last paid annual fee | ||
| EAL | Se: european patent in force in sweden |
Ref document number: 80400927.2 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19980518 Year of fee payment: 19 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19980525 Year of fee payment: 19 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 19980528 Year of fee payment: 19 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19980630 Year of fee payment: 19 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19980828 Year of fee payment: 19 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19990517 Year of fee payment: 20 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19990610 Year of fee payment: 20 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19990616 Year of fee payment: 20 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990620 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990620 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990620 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990630 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990630 |
|
| BE20 | Be: patent expired |
Free format text: 20000620 *AMS S.A. |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000101 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19990620 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20000101 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 20000629 |
|
| EUG | Se: european patent has lapsed |
Ref document number: 80400927.2 |