DE1601765C - Hydraulic fluid-actuated control valve - Google Patents

Description

swamp

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restricts. SPECIAL APPLICATIONS The controller 52 includes flyweights 62 which are used by the

The drawing represents schematatorh «η Δ ,,« -i, ^{3 Per} P ^{eUßr 10 are} driven depending on the speed,

Example of the invention in, zS «nSrV ^ r ^{? 8S} " 7 * 2 ** ^by ^ ⁶ ^ g ^ hte under the effect

hydraulic PropeäeueSdLr * "** ^d ^ ^ t ^ SaU ^ aft generated force in equilibrium

The propeller 10 is controlled via IaTrVMM, t-, ™ A ^d .? ^{r emer Re} 8 ^elfed he 66 stands The power of the

a drive motor M driven ^ S Lf T ⁸ ^ ⁶⁶ ^ ^{1 "1 is changed by a lever"}

wise in a well-known manner arb £ mft a J? 3 £ f "" ίΤ ^ "'^ ^{about 6} ^" ^noc ^ nactuated bracket 70

WU itd Sä? ^ ^1ει ? ^{βΓ 0} P ^ is Die Ventilsidl 64 it ii G

wise, in a known manner, armpits a J? 3 £ f ίΤ ^ ^ nactuated bracket 70

What seated compressor awSä *? ^ ^1ει ? ^{βΓ 0} P ^ becomes. The valve spindle 64 is mounted in a 72 Jängsverschieolich Ge-I 'to I rtftESSa * ^ * ¹ J ^ ^ ", which has a

^D ™ ^{cMass 74} dh d Dkfl

I «to I ^ rtenftEhSS.a ^ J ^ ^ Jgerschieolich stored, the one

adjustable propene filler, ΑΓ ^D ™ ^{dimension 74.} ' let in through the hydraulic fluid

sits in the illustrated AusSruZh ^ f · 1 ? ■ 2 ™ * "^ ^{emen outlet 76} « ** & ** the only one

"IjdnniltatobiSSEiSiSbSff ^iS? ^ ^F J ^e ^ ^Unden * ■ ^{A passage 78" housing} drove from Hydraulikflü3e? T S IS ^ """^'2acts""* ^{emem collar on the} valve stem 64 Zuder drawing S moves wfriSnTden A ^ tttt °° *! ^ ^County g ^sl> e _We supply the valve spinning pitch angle of the propeller S ^ rt The Fe ^ r ^ n "^^^ T ^ ^{the DurChIaß 78 and the Ρτο} ^ - and the counterweights 22 IS Jen KdE 1 ^ ί ^ ΐ ^Leul? ^ ^{8 S4 either to} drain with outlet76 of the drawing to the right uiY, _n H "° ^Ζ · Τ? ^to P. ^f . ^{or the} passage 74 for the pressure flow angle of attack of the profile ^ to SS * " ^SI ? ^k , ^{eit connect} t« " ^d so the changes of the pressure liquid a * TdT ₁ iSÜ lÄSm ^ an Γ ^ · ^ ^{,? r} ° ^{pellerS controls} · ^the ^ ^{Ier 52 receives} the piston skirt 26 sits ^ Γηηΐ Lm KolSnifi ^D ™ * liquid via a line 80 from a firmly connected link 24 ta ASrS ??? IT ^ ^source ' ^{about the} lubricating oil production of ^ rt ^ dtaenenuiSmdlniSSSÄiSMiir "' 7.? T '? ^Be « P ^ lsweisc with a pressure of and it is brought to «^ LäSS2 * rf! ™, ^^ ^ T ^ ^{This pressure is by the Re} ß "that with a reciprocating tt ^ tt ί Ή l ^ umpe 82, for example, to 42 kg / cm * up-piston 16 the AntlrihriJHSSdiföÄSiS Γ? "" ί ^aUf S ^ ^through ' ^{aß 74 for} ^ pressure fluid-16 moves in a cylinder M on the voSeS, ^^ hS' ^{St n} ° ^{Ch dne line 84 available} 'end of the hub 34, in which the ProoeHeVEt Äf ³ ° ^e t ™ ^Hllfs P ^um P ^e ™ Pumping of pressurized oil stigtist.The Kulisi24 £ X _M X £? S2? _i ii "he ^unt be special circumstances connected hub 34 mounted Sf 36 Άηά he ulfd ST ^ ° ^ ^{Ch Ün} J ^{ENFA" s may be} inserted ^{between the INTR} S is by this against rotation tested ^ «! · V ^ ⁶ """""'connected to ^{the controller} " en line 90 At the hub 34 sits a gear MΓα ,, v ** f ° ^a " ^{ZeS mh 88} ^ ^{ζβίεπηβ} *« adjusting valve in front of a gear 40 is driven on LlZ T ³⁵ 8 ^e ? F ^he V ^a · ^{with the help of which the Re} g ' ^{er vom}

62 are in a

Whole with 42 beiS ^ S ^^ fiSLi SSi? 'rf ^^ ⁸¹ _c ^an f ^{deUteter pressure reg-}

intended. The beta valve includes rinf JS * ν ι, ί * Λ " ^{pressure ω at this point} upright.

closed c VentfflKrh ^^ TLTSTS «f ' ^fed ? 5 ^ ⁶ V ^s / ^{in e} » l ^he hammer 94 housed the

Klb Sf! ^ f ' ¹ !! ¹ * ^{% Ud i DhIß 98 i} d

closed VentfflKrh ^^ TLTSTS "f? 5 ^ V / ^{in e} " l ^er hammer 94 housed, the piston skirt 26 concentric ι Sf Läneridit ™ "! ν ·· u ^ f ' ¹ !! ¹ *. ^{% U} " ^{d a passage 98 in} the

The axis of the ΚΙ I ff y ^ent ' ^Ischl .fberhülse 44 with the chamber 48 inside is connected at the same time to the axis of rotation of the ProneK η of ^the valve slide sleeve of the beta valve

closed end 46 of the vent lsÄS 12 f "" t ^ " ^{6 Ldtung 10} ° ^{and channel 102 in the Ve} '« i'-

Volume of the chamber 481 SaS Sf h ^ ^{M both} " ^south-acting springs held in the middle

liquid from the chamber 48 JSriSS. IMe ϊ «!! ^? ¹¹ ^ ·· ^ "^ ^{11 pressure} / ^ehaI ^ n.

The speed regulator for the Pmn ^ f * ι r * * P chamber 108 is available via the chamber 94 of the

1 601

Avenn the pressure in the chambers is a predetermined When the propellers pray under regulator control Exceeds the value, finds and the valve spindle between the control spring

The valve spindle 64 separates the two chambers 66 and the effect of centrifugal force on the 92 and 94 and acts as a piston, the two sides of which are balanced by flyweights 62, each becomes the respective pressures in these chambers are; At one end the valve spindle 64 has my 92 and 94 for the action of the control spring 66 at one Slot or groove 114, with a wear or counteracting it and a change End of a throttle channel 116 is in communication, the propeller speed and its effect on which extends longitudinally through the valve stem 64. the centrifugal force on the flyweights 62 is required the other end of the valve spindle is the io dem, to put the regulator valve back into an equal-throttle channel 116 to bring about the passage 118 with the weight position. Looked at differently, is Chamber 92 in connection, which by the side a change in propeller speed and a the surface of the valve spindle. A breakthrough in the sequence of changes in the centrifu-120 in the housing 72 of the control valve there is a longitudinal displacement longitudinal direction in galkraft on the flyweights 62 at the same height as the groove 114 and is exercise of the valve spindle 64 and a change in the leads into the chamber 94. The valve spindle 64 can adjust the angle of attack of the propeller as well as the position of the also perform a rotary movement and is in suitable piston shaft 26 in the chamber 48 with the entspreneter Way connected to a drive shaft, the corresponding change in volume and pressure in driven by the rotating propeller hub. the chamber 48 cause. This change in When the valve stem rotates and the groove 114 with ao pressure and volume there will be a change in pressure Passage 120 is at the same level, the Kam difference in the chambers 92 and 94 is in one mer 92 through the throttle channel 116 with the chamber in such a direction that the valve spindle 94 connected so that any pressure differences between 64 are returned to their neutral position, see the two chambers balance each other out while the propeller is still changing with its will be. he speed works. As the propeller however

The propeller, the regulator and the propulsion force has changed its angle of attack, the machine has been controlled by two control levers, the performance of the system has been changed in such a way that it tries to return to the state of power lever 160 and flight status lever 162 in which it is in front of which are designated. The flight status lever acts on speed disturbance.
the cams 122, 124 and 126. The power lever 30 As long as a pressure difference between the Kam-160 acts on the fuel control valve 128 and the mern 92 and 94, each rotation of the cams 130, 132 and 134 allows Groove 114 with 162 generally controls the propeller position for sail passage 120, traversing a small liquid position, rolling on the ground, take-off and laning amount from the chamber of higher pressure to the manure. The power lever 160 controls the fuel chamber at lower pressure and thus acts on a supply and coordinates the angle of attack of the pressure equalization between the two chambers. The propeller in the beta area, ie in the area of the manual throttle channel Π6, has a relatively long actuated control of the angle of attack, which means that a considerable amount of time is required to control the liquid and reverse position of the Propeller is located. 40 current through the throttle duct to its end gc-If the propeller is in the beta area, bring speed. This time and the amount will change the beta valve through the power lever 160 of the final speed decisively with mechanical actuation, and the control valve is controlled by the viscosity of the liquid, in the present case the power lever 160 by compressing the oil flowing into the throttle channel. Each was brought to a high speed position, but 45 found that when the column of oil in the throttle valve spindle 64 essentially rests to the left in the drawing and pressurizes the pressure and the line 54 is pressurized, the pressure is suddenly applied to the valve stem 64 The flow is so that the piston 16 also moves to the left in the throttle channel 116 during the flow and the angle of attack of the propeller assumes the smallest time interval over a wide viscosity. The movement of the piston skirt 26 after 50 ity area remains practically the same. If now the left brings the passage 137 to the same height as the width of the groove 114 and a width of the passage the collar 138 of the valve hats 44 and interrupts 120 dimensioned small enough so that with a certain influx of pressure fluid. If the KoI- ten governor speed, the time during which the throttle shaft 26 is shifted far enough to the left, selkanal 116 is exposed to the pressure difference, the passage 137 with the sump or the 53 is quite small in relation to the time taken to Outlet pressure in the transmission housing 22 connected. In order to achieve the final speed after a previous movement, the propeller tends to return to a high pressure difference and to take into account its angle of attack. The position of the viscosity range is required, so it is possible to determine the position of the Betaventiischieberhülse 44, a temporal flow rate through the rusting of the piston shaft 26 and the angle of attack 60 selkanal 116, which is essentially independent of the propeller blades. Since the valve spindle 64 is already pushed to the left by the action of the spring 66, depending on the viscosity of the liquid used. This is of particular importance because the power lever 160 brings a drive set of turbine and propeller into a high windage position where the temperatures to be expected and the change in volume in dcT 65 The resulting oil temperatures in the propeller ventilation ■ Chamber 48 have no significant influence on the corresponding change in the oil viscosity after setting the control valve *, as long as the propeller is pulled under sk-h. The importance increases even further, where Bctastcöcrung is. if for certain uses of the turbine / product

peller substitute the control must be extremely sensitive and responsive quickly and any delay and any lagging behind for the controller to respond would seriously jeopardize its effectiveness. This is particularly the case in certain arrangements in which the fuel supply for the engine is controlled by a device responsive to turbine temperature to keep it at a predetermined high for any given speed To maintain value and thus achieve the highest efficiency. Under these conditions, if the Propeller is kept at a preselected fixed angle of attack, an increase in the speed one generate greater increase in the available engine power than generated by the propeller can be taken. This leads to an unstable operating condition as the engine performance will continue to increase faster than that of the propeller Consumed power, and will manifest itself in a runaway of the machine. The reverse ratios would set in a drop in the engine speed, when the available power decreases faster than the power consumed by the propeller, so that the machine would be excessively burdened and stalled. To get an as To avoid such runaway or stalling, a propeller is necessary to control the angle of attack changes very quickly and can load or unload the turbine faster than it changes its performance. Such a high-gain propeller The tax system itself has a tendency to instability insofar as it overshoots and vibrates can. A feedback that responds quickly is therefore required, which regulates the controller back again and a temporary drop in speed with a time delay in compensating for the drop and when restoring the original speed setting.

If the time delay is subject to changes due to changes in viscosity in the fluid system If there were any, the effectiveness of the controller would be seriously jeopardized by overshooting and oscillation under one conditions and lagging and oscillation under the other conditions. From the It can be seen from the above that the time delay of the return is essentially independent of the viscosity and is almost entirely due to the inertia of the liquid in the throttle channel 116 and the time interval during which this dem Pressure difference in the chambers 92 and 94 is exposed.

The channel 102 in the beta valve slide sleeve and the passage 136 in the valve slide 64 are always exposed to the feed pressure and serve to reduce the Leakage losses in the chambers 48 and 94 are low keep. The channel 102 leads into an annular groove between the seal's collar for the high-pressure line 58 for the propeller blade adjustment and the sealing collar 50 of the chamber 48. The passage 136 leads into a Annular groove between a high pressure source and the chamber 94. Both serve to prevent any effect of leakage fluid from the high pressure sealing collars on the pressure in the chamber 94.

It is now assumed that the propeller and the controller in the normal state as in the drawing are located and that a disturbance causes an increase in the propeller speed, the flyweights 62 to the outside and the valve stem 64 to right drifts. Pressure fluid then exits the chamber 18 in the propeller hub via the passage 76 off, and the piston 16 is moved to the right by the spring 20 and the counterweight 22. The piston shaft 26 is thereby pushed into the chamber 48 and displaced from this pressure fluid, which enters the chamber 94 with an increase in pressure, the damping piston 104 moving to the left to accommodate the displaced amount of liquid. The increased pressure in the chamber 94 acts the end of the valve spindle 64 directed against it and generates a force on this which is substantially greater than the force against the other end of the valve in the chamber 92, which is essentially the constant pressure in this chamber is exposed. This causes the valve stem to move 64 to the left and to a new equilibrium between the forces exerted on the regulator valve by the counterweights and the regulating spring 66 and the pressures in chambers 92 and 94. This movement of the valve stem brings it into neutral or zero setting and prevents further changes in the angle of attack so that the system is temporarily in equilibrium at a new speed. The valve spindle is with a dei Rate of change of the angle of attack proportional speed pushed to the left until equilibrium is reached. Pressure fluid then emerges from the chamber 94 in an independent manner the viscosity is constant over time, which compensates for the drop in speed to a very good approximation, which will gradually adjust itself according to the increased angle of attack of the propeller blades, so that the speed returns to its normal predetermined distance, that through the temple 70 and of the Rebel SS was intended, whereby the Fro peller leaves assumed a new angle of attack do that to the original speed increase to compensate for leading disturbance.

For this purpose i sheet of drawings

Claims (6)

1 2 mounted freely movable and only exposed to the pressure differences acting on it, which it can follow in a damped manner, so that instabilities S occur in the event of a sudden pressure difference. 1. Hydraulic fluid operated control valve for sudden changes in a hy control a servo drive, which is a hydraulic control circuit, for example has gel member on which the opposing - often in the hydraulic system of an aircraft, acting pressures in two hydraulic fluid chambers z. B. in the hydraulic adjustment of a propeller act, of which the first Druckflüs- io lers. However, the propeller is allowed to change its state Fluid pressure chamber does not fold pressure too suddenly a preselected fluid of the hydraulic system has, while the pressure in the other, to no longer manageable instabilities of the to avoid ren hydraulic fluid chamber due to the moving flight condition. It is important that supply of a mechanism actuated by the servo drive to different viscosities of the which is determined in such a way that it does not respond too differently to the regulating fluid seeks back to its zero position, chen may. as indicated that there is a Dros starting from such a problem selkanal (116) the two hydraulic fluid chamber, the object of the invention is to provide a control valve of the to train mern (92, 94) on an intermittently opening type mentioned so that one of and closing valve (114, 120) connects. ao differences in viscosity as independent as possible 2. Control valve according to claim 1, characterized in that damping of the adjustment movement of the valve spindle indicates that the control member (64) occurs in one. Housing (72) is rotatably mounted and that for this purpose, the invention provides that a Drosselka valve (114,120) is formed through passages in the regulating member nal the two pressure fluid chambers via an internal (64) and housing (72), which in each 25 connecting the terminating opening and closing valve by turning the control element (64),
come to cover at least once. By connecting the two hydraulic fluid 3. Control valve according to claim 1 or 2, da- tial chambers via the throttle channel, which intermittently through characterized in that the control member (64) is opened and closed as rend, results in in the housing (72) longitudinally displaceable valve pin 30 a pressure difference in the pressure fluid valve is formed, in which the throttle channel (116) chambers no violent adjustment movement, but is provided as a longitudinal passage. a gradual compensation that z. B. in the event of an un- 4. Control valve according to one of claims 1 to the desired increase in speed of the propeller and the 3, characterized in that in the first initiated enlargement of the angle of attack on it Pressure fluid chamber (92), which takes into account that the propeller needs to be slowed down has selected fluid pressure, with which it takes time from the increased angle of attack. On the other hand, it results in intermittent movement binding flyweights (62) under the viscous flow in the throttle channel the Efbracht which, when their speed is increased, only ever start the movement of the liquid control element (64) is used against the force of a column of strength in which there are differences other hydraulic fluid chamber (94) not as noticeable as if Adjust the spring (66). there is a steady flow in the throttle channel 5. Control device according to claim 4, characterized in that it can set a noticeable speed characterized in that the bias of the spring develops at which speed differences (66) via a lever arrangement (68, 70) freely adjustable 45 and 45 friction between the individual liquids is. Zones set and then of course heavily dependent on the 6. Control valve according to one of claims 1 to viscosity depends. 5, characterized by its use for In a preferred embodiment can pre-control the adjustment of the angle of attack can be seen that the control member in a housing Blades (30) of a propeller. 5 ° is rotatably arranged and that the valve through Passages are formed in the regulating member and the housing, which with each revolution of the regulating member with one another come to cover at least once. The control element can be used as a longitudinal 55 displaceable valve spindle be formed in the The invention relates to a pressurized fluid throttle channel is provided as a longitudinal passage. Time-actuated control valve for controlling a ser- The generation of a control equilibrium can be vöäntriebes, which has a control element, to which are caused by that in the first pressure fluid ii the opposing pressures in two fluid chambers that correspond to the preselected fluid Acting pressure fluid chambers, of which the 60 has pressure, with that operated by the servo drive first pressurized fluid chamber a preselected device operatively connected centrifugal Has liquid pressure, while the pressure is housed in the weight, which increases its other hydraulic fluid chamber by moving the speed of the control element against the force of an in Supply of a member operated by the servo drive of the other hydraulic fluid chamber is provided is determined in such a way that he adjusts the control element in 65 spring, seeks to return its zero position. The preload of the spring is useful here Such a control valve is freely adjustable from the Swiss one using a lever arrangement. Patent 31 228 known. The valve spindle is The properties of the inventive control