DK151148B - FACILITIES FOR CONTROL OF THE GAS SHARE IN A PRESSURE LIQUID SYSTEM - Google Patents

FACILITIES FOR CONTROL OF THE GAS SHARE IN A PRESSURE LIQUID SYSTEM Download PDF

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Publication number
DK151148B
DK151148B DK394083A DK394083A DK151148B DK 151148 B DK151148 B DK 151148B DK 394083 A DK394083 A DK 394083A DK 394083 A DK394083 A DK 394083A DK 151148 B DK151148 B DK 151148B
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Denmark
Prior art keywords
pressure
valve
series connection
fixed
pressure drop
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DK394083A
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Danish (da)
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DK394083D0 (en
DK151148C (en
DK394083A (en
Inventor
Erik Kyster
Svend Erik Thomsen
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Danfoss As
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/76—Mixers with stream-impingement mixing head
    • B29B7/7615—Mixers with stream-impingement mixing head characterised by arrangements for controlling, measuring or regulating, e.g. for feeding or proportioning the components
    • B29B7/7621—Mixers with stream-impingement mixing head characterised by arrangements for controlling, measuring or regulating, e.g. for feeding or proportioning the components involving introducing a gas or another component in at least one of the components
    • 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

Description

i 151148in 151148

Opfindelsen angår en indretning til konstatering af gasandelen i et under tryk stående væskesystem ifølge overbegrebet til henholdsvis krav 1 og krav 2.The invention relates to a device for determining the gas fraction in a pressurized liquid system according to the concept of claims 1 and 2, respectively.

Ved en kendt indretning af denne art (fig. 2 i DE-AS 5 23 19 135) aktiveres en som gliderventil udformet spærreven til af trykfaldet ved den faste drossel således, at forbrugertilledningen og forbrugerreturledningen først åbnes, når den tilførte væskemængde indeholder en tilladelig lille gasandel. Først ledes væske med for stor gasandel over den fa-10 ste drossel direkte til lavtryksiden. Den faste drossel danner sammen med den variable drossel, som er udformet på spærreventilens glider, en serieforbindelse, som ligger parallelt med forbrugeren. Denne parallelle forbindelse er over en indstillelig drossel forbundet med beholderen. Den 15 variable drossel er anbragt, for at den over den faste drossel strømmende trykmiddelmængde er konstant.In a known device of this kind (Fig. 2 of DE-AS 5 23 19 135), a locking valve designed as a sliding valve is actuated by the pressure drop at the fixed throttle, so that the consumer supply and the consumer return line are only opened when the supplied quantity of liquid contains a permissible small amount. gas portion. First, fluid with too much gas is passed directly over the first throttle directly to the low pressure side. The fixed choke, together with the variable choke formed on the slider of the shut-off valve, forms a series connection parallel to the consumer. This parallel connection is connected to the container via an adjustable choke. The 15 variable throttle is arranged so that the amount of pressure medium flowing over the fixed throttle is constant.

Herved skal det være sikret, at forbrugeren kun tilføres trykvæske, som højst indeholder en tilladelig lille gasmængde, således at funktionsforstyrrelser bortfalder på grund af 20 luftansamlinger. Det er imidlertid vanskeligt at indstille den glideren belastende fjeder således, at der ved enhver driftsmåde sker en sikker luftudskillelse. For når indretningen er dimensioneret for en lille leveringsmængde, skal luftandelen være meget stor, før spærreventilen lukker. Er 25 indretningen derimod indrettet for en større leveringsmængde, er der fare for, at spærreventilen overhovedet ikke åbner, selv når trykvæsken er fuldstændig fri for luft.In this way, it must be ensured that the consumer is supplied with only pressurized fluid, which contains at most a permissible small amount of gas, so that malfunctions are lost due to 20 air accumulations. However, it is difficult to adjust the slider load spring so that in any operating mode a safe air separation occurs. Because when the device is sized for a small amount of delivery, the air proportion must be very large before the shut-off valve closes. On the other hand, if the device is arranged for a larger amount of delivery, there is a danger that the shut-off valve will not open at all, even when the pressure fluid is completely free of air.

Formålet med opfindelsen er at angive en indretning til konstatering af gasandelen i et under tryk stående væskesystem 30 af den i indledningen beskrevne art, ved hvilken en meget nøjagtig konstatering af gasandelen og dermed, ved behov, også en meget nøjagtig gasandelsafhængig styring af en tilhørende ventil er mulig under alle driftsbetingelser.The object of the invention is to provide a device for detecting the gas part in a pressurized liquid system 30 of the kind described in the preamble, in which a very accurate determination of the gas part and thus, if necessary, also a very accurate gas share-dependent control of an associated valve is possible under all operating conditions.

2 1511482 151148

Denne opgave løses ifølge opfindelsen ved den kendetegnende del ifølge krav 1.This task is solved according to the invention by the characterizing part of claim 1.

Ved denne indretning er væskens volumen, som strømmer gennem de i serie liggende drosler, ens; volumenet af den indeluk-5 kede gas er imidlertid på grund af tryksænkningen mellem de to drosler større end før den første drossel. Under ellers ens forhold, som er forudbestemt af den faste referenceværdi, stiger derfor forholdet mellem trykfaldet ved den anden drossel og trykfaldet ved den første drossel, jo større gas-10 andelen er. Ved måling af dette trykfald eller trykfaldenes forhold ved de to drosler kan gasandelen derfor bestemmes med stor nøjagtighed og i givet fald udnyttes til styringen. Derudover kan trykfaldet ved serieforbindelsen begrænses, således at tabene er ringe. Hvis trykregulatoren holder 15 trykket ved serieforbindelsen eller ved den anden drossel konstant, kan den ene af trykregulatorens trykflader være direkte forbundet med lavtryksiden, hvad der forenkler konstruktionen.In this device, the volume of liquid flowing through the series throttles is equal; however, due to the pressure drop between the two throttles, the volume of the enclosed gas is greater than before the first throttle. Therefore, under otherwise similar conditions predetermined by the fixed reference value, the ratio of the pressure drop at the second throttle to the pressure drop at the first throttle increases, the greater the gas-10 proportion. Therefore, when measuring this pressure drop or the pressure drop ratio at the two throttles, the gas fraction can be determined with great accuracy and, if applicable, utilized for the control. In addition, the pressure drop at the series connection can be limited so that the losses are small. If the pressure regulator keeps the pressure at the series connection or at the other throttle constant, one of the pressure faces of the pressure regulator may be directly connected to the low pressure side, which simplifies the construction.

Den kendetegnende del ifølge krav 2 angiver en alternativ 20 løsning. Her fås de samme fordele, med undtagelse af at der fås den konstruktive forenkling ved, at det ene målepunkt er dannet af lavtryksiden ved udnyttelsen af det udtagne trykfald.The characterizing part of claim 2 indicates an alternative solution. Here the same advantages are obtained, except that the constructive simplification is obtained by the fact that one measurement point is formed by the low pressure side when the utilized pressure drop is utilized.

Ved hjælp af afledeventilen ifølge krav 3 bortledes gashol-25 dig trykvæske, som der især skal tages hensyn til ved indkoblingen af en pumpe, hurtigt hen mod lavtryksiden, således at forbrugeren tilsvarende hurtigt kan forsynes med gasfri trykvæske. Derudover kan denne afledningsvej i normaldrift helt eller i stor udstrækning lukkes, således at tilsvarende 30 tab bortfalder.By means of the discharge valve according to claim 3, gas-containing pressure liquid, which must be taken into account in particular when switching on a pump, is quickly discharged towards the low-pressure side, so that the consumer can similarly quickly be supplied with gas-free pressure liquid. In addition, in normal operation, this diversion path can be closed completely or to a large extent, so that a corresponding 30 losses are lost.

Udformningen som overtryksventil ifølge krav 4 giver en særlig enkel konstruktion.The design as a pressure relief valve according to claim 4 provides a particularly simple construction.

151148 3151148 3

Ved kombinationen med en spærreventil ifølge krav 5 er det ved spærringen i forhøjet grad sikret, at forbrugeren kun modtager gasfri eller gasfattig trykvæske.By combining with a shut-off valve according to claim 5, the lock-up ensures that the consumer receives only gas-free or low-pressure pressurized liquid.

Glideren indtager ved udførelsen ifølge krav 6 som funktion 5 af trykfaldet ved de to drosler en passende ligevægtsstilling. Forholdet mellem de to trykflader kan vælges efter et passende trykfald.In the embodiment according to claim 6, the slider assumes as a function 5 of the pressure drop at the two thrusters an appropriate equilibrium position. The ratio of the two pressure faces can be selected after a suitable pressure drop.

Ved anvendelsen af fjederen ifølge krav 7 samvirker de forskellige fladeforhold og fjederen for at bestemme gliderens 10 ligevægtsstillinger. I sammenligning med en glider med lige store trykflader og en fjeder kan der ved forskellige fladeforhold anvendes en fjeder med en karakteristik, som har en mindre hældning.In using the spring according to claim 7, the different surface conditions and the spring cooperate to determine the equilibrium positions of the slider 10. Compared to a slider with equal pressure surfaces and a spring, a different spring can be used with a characteristic having a lower slope under different surface conditions.

Udførelsen ifølge krav 8 giver en særlig enkel konstruktion.The embodiment of claim 8 provides a particularly simple construction.

15 Ved udformningen af trykregulatoren som trykreduktionsventil ifølge krav 9 kan trykreguleringsfunktion og afledefunktion adskilles fra hinanden.In designing the pressure regulator as the pressure reducing valve according to claim 9, the pressure control function and the discharge function can be separated from each other.

Med kombinationen af trykreduktionsventilen med en hjælpeventil ifølge krav 10 er det sikret, at serieforbindelsen 20 fortrinsvis forsynes med trykvæske, og de øvrige dele af systemet modtager først trykvæske, når serieforbindelsens funktionsmåde er sikret.With the combination of the pressure reducing valve with an auxiliary valve according to claim 10, it is ensured that the series connection 20 is preferably supplied with pressure fluid and the other parts of the system receive pressure fluid only when the operation of the series connection is secured.

Opfindelsen forklares nærmere nedenstående ved hjælp af flere foretrukne, på tegningen viste udførelseseksempler, der 25 viser i fig. 1 diagrammet for en første udførelsesform, fig. 2 diagrammet for en anden udførelsesform og fig. 3 diagrammet for en tredie udførelsesform.The invention is explained in more detail below with the aid of several preferred embodiments shown in the drawing, which are illustrated in FIG. 1 is a diagram of a first embodiment; FIG. 2 is a diagram of another embodiment; and FIG. 3 shows the diagram of a third embodiment.

4 1511484 151148

Ved indretningen i fig. 1 bestemmer en pumpes 1 udgang tryksiden 2 af et hydraulisk system, mens lavtryksiden er vist ved hjælp af en beholder 3. En serieforbindelse 4 af en første fast drossel 5 og en anden fast drossel 6 er under for-5 ankobling af en som trykregulator 7 virkende trykreduktionsventil 8 koblet mellem trykside 2 og beholder 3. Når pumpetrykket betegnes med P-j, hersker der i ledningen 9 mellem trykregulator 7 og serieforbindelse 4 et konstant tryk P2t ved udtaget 10 mellem de to drosler 5 og 6 et variabelt tryk 10 P3 og på serieforbindelsens 4 udgang et konstant beholdertryk P4.In the device of FIG. 1, the output side of a pump 1 determines the pressure side 2 of a hydraulic system, while the low pressure side is shown by means of a container 3. A series connection 4 of a first fixed throttle 5 and a second fixed throttle 6 is pre-connected by a pressure regulator 7 acting pressure reducing valve 8 coupled between pressure side 2 and container 3. When the pump pressure is indicated by Pj, in the conduit 9 between pressure regulator 7 and series connection 4 there is a constant pressure P2t at outlet 10 between the two thrusters 5 and 6 a variable pressure 10 P3 and on the series connection. 4 output a constant container pressure P4.

Trykregulatoren 7 har en glider 11, som har to lige store trykflader 12 og 13. Trykfladen 12 er belastet af trykket P2, trykfladen 13 er belastet af beholdertrykket P4 og en 15 fjeder. Som følge heraf åbner det trykreduktionsventilen dannende drosselsted 8 så meget, at trykket P2 i ledningen 9 forbliver konstant.The pressure regulator 7 has a slider 11 which has two equal pressure faces 12 and 13. The pressure surface 12 is loaded by the pressure P2, the pressure surface 13 is loaded by the container pressure P4 and a spring. As a result, the pressure reducing valve forming throttle location 8 opens so much that the pressure P2 in the conduit 9 remains constant.

Tryksiden 2 fører til en kombineret ventil 15, som har en glider 16, der har to lige store trykflader 17 og 18. Den 20 første trykflade 17 er belastet af trykket P2* den anden trykflade 18 er belastet af trykket P3 og af en fjeder. Ved hjælp af to modsat arbejdende drosselsteder dannes en afledeventil 20, som fører til beholderen 3, og en spærreventil 21, som fører til forbrugerledningen 22.The pressure side 2 leads to a combined valve 15 having a slider 16 having two equal pressure faces 17 and 18. The first pressure surface 17 is loaded by pressure P2 * the second pressure surface 18 is loaded by pressure P3 and by a spring. By means of two oppositely acting choke points, a drain valve 20 is formed which leads to the container 3 and a shut-off valve 21 which leads to the consumer line 22.

25 I normal drift, når trykvæsken ingen luft indeholder, har trykfaldene ved de faste drosler 5 og 6 et fast forhold.25 In normal operation, when the pressure fluid contains no air, the pressure drops at the fixed thrusters 5 and 6 have a fixed ratio.

Trykket P3 har en så ringe værdi, at glideren 16 bevæges mod højre, således at afledeventilen 20 er lukket, og spærreventilen 21 er åben. Når derimod trykvæsken indeholder luft i 30 betydelig grad, er trykfaldet ved den faste drossel 5 mindre i sammenligning med trykfaldet ved den faste drossel 6. Da trykket P2 holdes konstant, indtager glideren 16 en stilling, i hvilken afledeventilen 20 er åben, og spærreventilen 5 151148 21 er helt eller delvis lukket. Som følge heraf kan den luftholdige trykvæske strømme fra pumpeudgangen 2 over afledeventilen 20 til beholderen 3, mens forbrugeren ikke modtager væsentlige mængder luftholdig trykvæske.The pressure P3 has such a low value that the slider 16 is moved to the right so that the diverter valve 20 is closed and the shut-off valve 21 is open. In contrast, when the pressure fluid contains air to a considerable extent, the pressure drop at the fixed throttle 5 is smaller compared to the pressure drop at the fixed throttle 6. As the pressure P2 is kept constant, the slider 16 occupies a position in which the drain valve 20 is open and the shut-off valve 5 151148 21 is completely or partially closed. As a result, the air-containing pressure fluid can flow from the pump outlet 2 over the discharge valve 20 to the container 3, while the consumer does not receive significant amounts of air-containing pressure fluid.

5 Ved udførelsesformen i fig. 2 anvendes der for tilsvarende dele henvisningsbetegnelser forhøjet med 100. I dette tilfælde sørger trykregulatorens 107 trykreduktionsventil 108 for, at trykfaldet ved den anden faste drossel 106 forbliver konstant. Til dette formål er gliderens 111 trykflade 112 10 forbundet med udtaget 110 og som følge deraf belastet af trykket P3, mens den lige så store trykflade 113 er belastet af beholdertrykket P4 og fjederen 114. Endvidere tjener trykfaldet ved den første faste drossel 105 til aktivering af den kombinerede ventil 115. Dennes glider 116 er på sin 15 mindre trykflade 117 påvirket af det regulerede tilløbstryk P2 og på sin større trykflade 118 af trykket P3 ved udtaget 110 og fjederen 119. Desuden er ved trykregulatoren 107 trykreduktionsventilen 108 kombineret med en hjælpeventil 123, som dannes af gliderens 111 andet drosselsted og først 20 åbner, når der er en tilstrækkelig trykvæskemængde til rådighed, som så over en ledning 124 ledes til den kombinerede ventil 115.5 In the embodiment of FIG. 2, reference numerals, plus 100, are used for corresponding parts. In this case, the pressure reducing valve 108 of the pressure regulator 107 ensures that the pressure drop at the second fixed choke 106 remains constant. For this purpose, the pressure surface 112 of the slider 111 is connected to the outlet 110 and consequently is loaded by the pressure P3, while the equal pressure surface 113 is loaded by the container pressure P4 and the spring 114. Furthermore, the pressure drop at the first fixed throttle 105 serves to activate the the combined valve 115. Its slider 116 is, on its smaller pressure surface 117, influenced by the regulated supply pressure P2 and on its larger pressure surface 118 by the pressure P3 at the outlet 110 and the spring 119. Furthermore, at the pressure regulator 107, the pressure reduction valve 108 is combined with an auxiliary valve 123, which is formed by the second throttle location of the slider 111 and only opens when a sufficient amount of pressure fluid is available which is then passed over a line 124 to the combined valve 115.

Hvis trykvæsken ingen luft indeholder, og der leveres tilstrækkelig trykvæske, indtager glideren 111 en stilling, i 25 hvilken trykfaldet ved den faste drossel 106 er konstant.If the pressure fluid contains no air and sufficient pressure fluid is supplied, the slide 111 occupies a position in which the pressure drop at the fixed throttle 106 is constant.

Også trykfaldet ved den faste drossel 105 har så en forudbestemt værdi. Hjælpeventilen 123 er tilstrækkelig vidt åben.The pressure drop at the fixed choke 105 also has a predetermined value. Auxiliary valve 123 is sufficiently wide open.

Har trykvæsken derimod en betydelig luftandel, bevæger glideren 111 sig mod venstre, således at trykfaldet ved den fa-30 ste drossel 106 ganske vist forbliver konstant, men den over serieforbindelsen 104 leverede trykvæskemængde er mindre.On the other hand, if the pressurized fluid has a considerable air fraction, the slider 111 moves to the left, so that the pressure drop at the first throttle 106 remains constant, but the amount of pressurized fluid supplied over the series connection 104 is smaller.

Dette betyder, at trykfaldet ved den faste drossel 105 forringes. Glideren 116 bevæger sig mod højre. Som følge heraf lukker spærreventilen 121, mens afledeventilen 120 åbner. På 6 151148 denne måde ledes luftholdig trykvæske hurtigt til beholderen.This means that the pressure drop at the fixed choke 105 decreases. Slider 116 moves to the right. As a result, the shut-off valve 121 closes while the diverter valve 120 opens. In this way, air-containing pressurized liquid is quickly conveyed to the container.

Ved udførelsesformen i fig. 3 benyttes der for tilsvarende dele henvisningsbetegnelser forhøjet med 200 i forhold til 5 fig. 1. I dette tilfælde holdes trykfaldet ved den første faste drossel 205 konstant. Til dette formål er trykregulatorens 207 glider 211 på den ene trykflade 212 påvirket af trykket P2 i ledningen 209 og på den anden trykflade 213 af trykket P3 ved udtaget 210 og af fjederen 214. Glideren 211 10 har to modsat arbejdende drosselsteder, af hvilke det ene danner trykreduktionsventilen 208 og det andet spærreventilen 221, som fører til forbrugerledningen 222. Afledeventi-. len er her udført som overtryksventil, som er koblet paral lelt med serieforbindelsen 204.In the embodiment of FIG. 3, reference numerals increased by 200 in relation to 5 fig. 1. In this case, the pressure drop at the first fixed throttle 205 is kept constant. For this purpose, the slider 211 of the pressure regulator 207 on one of the pressure faces 212 is influenced by the pressure P2 in the conduit 209 and on the other pressure surface 213 by the pressure P3 at the outlet 210 and by the spring 214. The slider 211 10 has two opposite throttle positions, one of which forms the pressure reduction valve 208 and the second shut-off valve 221 which leads to the consumer conduit 222. Drain valve. The valve is here designed as a pressure valve, which is connected in parallel with the serial connection 204.

15 I normal drift, når trykvæsken ingen gas indeholder, regulerer trykregulatoren 207 trykket P2 således, at trykfaldet ved droslen 205 er konstant. Tilsvarende er også trykfaldet ved droslen 206 konstant. Hvis trykvæsken derimod indeholder luft, stiger trykfaldet ved den faste drossel 206, mens 20 trykfaldet ved droslen 205 som før holdes konstant. Som følge heraf tiltager trykfaldet ved serieforbindelsen 204. Hvis der er så meget indeholdt luft, at trykfaldet ved serieforbindelsen overskrider overtryksventilens 220 reaktionsværdi, åbner denne, og den luftholdige trykvæske kan flyde direkte 25 til beholderen 203. Da glideren 211 ved luftholdig trykvæske skal bevæges mod venstre for at holde trykfaldet i droslen 205 konstant, lukkes samtidig spærreventilen 221 på ønsket måde.In normal operation, when the pressure fluid contains no gas, the pressure regulator 207 regulates the pressure P2 such that the pressure drop at the throttle 205 is constant. Similarly, the pressure drop at throttle 206 is also constant. On the other hand, if the pressure fluid contains air, the pressure drop at the fixed throttle 206 rises, while the pressure drop at the throttle 205, as before, is kept constant. As a result, the pressure drop at the series connection 204. If there is so much contained in the air that the pressure drop at the series connection exceeds the reaction value of the pressure valve 220, it opens and the air-containing pressure fluid can flow directly 25 to the container 203. As the air compressor liquid slider 211 has to move towards left to keep the pressure drop in the throttle 205 constant, at the same time the shut-off valve 221 is closed as desired.

Den beskrevne indretning er ikke kun egnet for hydrauliske 30 eller hydrostatiske anlæg, men kan altid anvendes, når der optræder et gasformigt og et flydende medium i blanding, fx ved emulsioner. Fx kan man udnytte måle- eller styrefremgangsmåden til at indstille gasandelen i det rigtige forhold ved fremstilling af skumstof.The device described is not only suitable for hydraulic or hydrostatic systems, but can always be used when a gaseous and a liquid medium is present in admixture, for example in emulsions. For example, one can utilize the measurement or control method to set the gas proportion to the correct ratio in the production of foam.

Claims (10)

151148151148 1. Indretning til konstatering af gasandelen i et under tryk stående væskesystem, såsom luftandelen i et hydrauliksystem, med en mellem en med tryk førende del og systemets lavtrykside liggende vedvarende gennemstrøm-5 met serieforbindelse (4; 104) af to, af den samme mæng de gennemstrømmede, drosler (5, 6; 105, 106), af hvilke den ene er en fast drossel (5? 105), ved hvilken et trykfald udtages, som især tjener til den gasandelsaf-hængige styring af en ventil (20; 120), k e n d e -10 tegnet ved, at serieforbindelsen består af fa ste drosler (5, 6; 105, 106), og at trykfaldet ved den anden faste drossel eller ved serieforbindelsen holdes på en fast referenceværdi ved hjælp af en trykregulator (7; 107).Apparatus for detecting the gas portion of a pressurized fluid system, such as the air portion of a hydraulic system, having a continuous flow-through series connection (4; 104) of two of the same quantity between a pressurized portion and the system's low-pressure side. the flowthrough thrusts (5, 6; 105, 106), one of which is a fixed throttle (5? 105), at which a pressure drop is applied, which serves in particular for the gas-dependent control of a valve (20; 120 ), knowing the -10 sign that the series connection consists of fixed throttles (5, 6; 105, 106) and that the pressure drop at the second fixed throttle or at the series connection is kept at a fixed reference value by a pressure regulator (7; 107 ). 2. Indretning til konstatering af gasandelen i et under tryk stående væskesystem, såsom luftandelen i et hydrauliksystem, med en mellem en med tryk førende del og systemets lavtrykside liggende vedvarende gennemstrømmet serieforbindelse (204) af to, af den samme mængde 20 gennemstrømmede, drosler (205, 206), af hvilke den ene er en fast drossel (205), hvorved et trykfald udtages, som især tjener til den gasandelsafhængige styring af en ventil (220), kendetegnet ved, at serieforbindelsen består af faste drosler (205, 206), at 25 trykfaldet udtages ved serieforbindelsen, og at tryk faldet ved en af de faste drosler (205) holdes på en fast referenceværdi ved hjælp af en trykregulator (207).2. Apparatus for detecting the gas portion of a pressurized fluid system, such as the air portion of a hydraulic system, with a continuous flowing series connection (204) lying between a pressurized portion and the low pressure side of the system of two, of the same amount of 20, 205, 206), one of which is a fixed throttle (205), whereby a pressure drop is applied, which mainly serves for the gas-part-dependent control of a valve (220), characterized in that the series connection consists of fixed thrusters (205, 206). that the pressure drop is taken out by the series connection and that the pressure drop at one of the fixed throttles (205) is kept at a fixed reference value by means of a pressure regulator (207). 3. Indretning ifølge krav 1 eller 2,kendeteg-30 n e t v e d en afledeventil (20; 120; 220), som er styret af trykfaldet ved i det mindste en del af serie- 151148 forbindelsen, og som i det mindste ved utilladelig stor gasandel åbner hen mod lavtryksiden (3; 103; 203).Device according to claim 1 or 2, characterized by a discharge valve (20; 120; 220), which is controlled by the pressure drop at least part of the series connection and which opens at least with an impermissibly large gas fraction towards the low pressure side (3; 103; 203). 4. Indretning ifølge krav 3,kendetegnet ved, at afledeventilen (220) er en overtryksventil, som åb- 5 ner, når trykfaldet ved serieforbindelsen (204) over skrider en forudbestemt værdi.Device according to claim 3, characterized in that the discharge valve (220) is a pressure relief valve which opens when the pressure drop at the series connection (204) exceeds a predetermined value. 5. Indretning ifølge krav 3, kendetegnet ved, at afledeventilen (20; 120) er kombineret med en spær-reventil (21;121), som spærrer forbrugerledningen (22; 10 122) ved utilladelig stor gasandel.Device according to claim 3, characterized in that the diverter valve (20; 120) is combined with a shut-off valve (21; 121) which blocks the consumer pipe (22; 10 122) at an impermissibly high gas fraction. 6. Indretning ifølge krav 3 eller 5, kendetegnet ved, at afledeventilen (120) er dannet af drosselsiden af en glider (116), som har en mindre, med serieforbindelsens (104) tilløbstryk samvirkende tryk- 15 flade (117) og en større, modsat virkende, med et udtag (110) mellem de to faste drosler forbundet trykflade (118).Device according to claim 3 or 5, characterized in that the diverter valve (120) is formed by the throttle side of a slider (116) having a smaller pressure surface (117) co-operating with the inlet pressure of the series connection (104) and a larger one. , counteracting, with an outlet (110) connected to the pressure surface (118) between the two fixed thrusters. 7. Indretning ifølge krav 6, kendetegnet ved, at den større trykflade (113) er understøttet af en 20 fjeder (114).Device according to claim 6, characterized in that the larger pressure surface (113) is supported by a spring (114). 8. Indretning ifølge et af kravene 5-7, kendetegnet v e d, at glideren (116) med et andet, modsat det første arbejdende drosselsted danner spærreventilen (121).Device according to one of claims 5-7, characterized in that the slide (116) forms a locking valve (121) with a second, opposite to the first working throttle location. 9. Indretning ifølge et af kravene 1-8, kendeteg ne t v e d, at trykregulatoren (7; 107; 207) er en i serie med serieforbindelsen (4; 104; 204) anbragt trykreduktionsventil (8? 108; 208).Device according to one of claims 1-8, characterized in that the pressure regulator (7; 107; 207) is a series of pressure reducers (8? 108; 208) arranged in series with the series connection (4; 104; 204). 10. Indretning ifølge krav 9,kendetegnet ved. 151148 at trykreduktionsventilen (108) er kombineret med en hjælpeventil (123), som først åbner, når der står en tilstrækkelig væskemængde til rådighed.Device according to claim 9, characterized in. 151148, the pressure reducing valve (108) is combined with an auxiliary valve (123) which only opens when a sufficient amount of liquid is available.
DK394083A 1982-09-10 1983-08-30 FACILITIES FOR CONTROL OF THE GAS SHARE IN A PRESSURE LIQUID SYSTEM DK151148C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3233551 1982-09-10
DE3233551A DE3233551C2 (en) 1982-09-10 1982-09-10 Device for detecting the gas content in a pressurized liquid system

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DK394083D0 DK394083D0 (en) 1983-08-30
DK394083A DK394083A (en) 1984-03-11
DK151148B true DK151148B (en) 1987-11-09
DK151148C DK151148C (en) 1988-04-18

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DE4120447B4 (en) * 1991-06-20 2004-06-03 Linde Ag Bleeding device for a hydraulic system
ES2134239T3 (en) * 1992-01-23 1999-10-01 Sun Electric Systems Bv PROCEDURE AND DEVICE TO DETECT UNSOLVED GASES IN A HYDRAULIC CONTROL SYSTEM.
DE102007026943B4 (en) * 2007-04-19 2016-01-07 Continental Automotive Gmbh Method for reducing switching errors of an electrohydraulic switching component and associated control unit
DE102012221954A1 (en) * 2012-11-30 2014-06-05 Robert Bosch Gmbh Gas detection device for detecting presence of air bubbles in hydraulic oil in e.g. oil circuit for lubricating engine of hydraulic hybrid vehicle, has control device including display unit, by which presence of gas in fluid is displayed
DE102013224744B4 (en) * 2013-12-03 2024-04-04 Zf Friedrichshafen Ag Method for reducing air buildup

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US2635620A (en) * 1951-02-07 1953-04-21 Bendix Aviat Corp Automatic air bleed valve
DE2319135C3 (en) * 1973-04-16 1980-09-11 Deere & Co., Moline, Ill. (V.St.A.), Niederlassung Deere & Co. European Office, 6800 Mannheim Switching valve of a pressure medium supply device for a hydrostatic power steering for vehicles

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DK394083D0 (en) 1983-08-30
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DK151148C (en) 1988-04-18
DK394083A (en) 1984-03-11

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