Electro-hydraulic power amplifier with mechanic feedback of slide position

FIELD: machine building.

SUBSTANCE: in amplifier there is implemented jet amplifier stage with two pressure nozzles and correspondingly with two receiving channels connected by means of their hydraulic lines with sub-end cavities of slide. The jet amplifier stage consists of two cylinder elements coaxially and with a gap installed in a case. A deflector gate of an electro-mechanic converter is arranged in slots in the cylinder elements from the side of ends facing each other. The pressure nozzle and the receiving channel are coaxially arranged in the slot of each element from the side of cylinder surface. Threaded sleeves are screwed on threaded ends of the cylinder elements from the side opposite to the slot. With their external thread the sleeves are screwed into the case. Also thread in the case, on the cylinder elements and correspondingly in the threaded sleeves has different pitch.

EFFECT: improved processability of fabrication, simplification of jet amplifier design and facilitation of its adjustment with high accuracy.

1 dwg

 

The present invention relates to the field of engineering electro-hydraulic automation and can be used in high-precision control systems working bodies moving vehicles and aircraft.

A known design of electrohydraulic amplifiers using in the preliminary stage of the inkjet principle, in particular amplifiers with fixed nozzles mounted coaxially with the receiving holes and shading of the stream deflector. The advantage of this scheme is high gain, the ability to work at pressures up to 20 MPa and high manufacturability (see "Hydraulic and hydro tools" edited Wieczorowe, ed. Mechanical engineering, 1979, p.48, Fig.25).

The closest analogue-a prototype of the claimed technical solution on a set of attributes and the achieved effect is electrohydraulic power amplifier, comprising a housing with an intake and discharge channels supply hydrophane and abdominal channels, with tributum cylindrical valve connected through a ball placed in the middle groove of the collar of the valve, with the power spring mechanical position feedback valve, made as a single part with hard rod established the military at the end of the anchor Electromechanical transducer, and the other part is rigidly connected with a movable deflector having an internal tapered bore with the larger diameter of which is placed a fixed discharge nozzle with an internal channel in communication with the pressure hydroline through the filter from the side of smaller diameter is placed a stationary receiver with a tapered channels provided through the hydroline in the housing with corresponding potrzebie cavities of the valve (see "Engineering studies of hydraulic actuators in aircraft edited by Dr. Prof. Genopole, ed. "Engineering", Moscow, 1978, p.51, rich).

The main advantage of the specified electro-hydraulic amplifier in comparison with the other made with the item "the nozzle-valve" is the presence of one discharge nozzles instead of two, which implies that the probability only "passive" failure to clogging of the inner channel discharge nozzles and eliminates the "active denial, which is possible for electrohydraulic amplifiers with an element of "the nozzle-valve".

The disadvantages of this inkjet amplification stage should include a tapered receiving apertures located at an angle to the pressure nozzle that makes a certain technological complexity in manufacture and adjustment of the exact relative position of the elements of the three pressure nozzle - del ctor - receiver".

The technical task of the invention is to improve the manufacturability and improving the accuracy of adjustment of the jet cascade control.

The problem is solved in that in the claimed electrohydraulic power amplifier mechanical feedback valve position, comprising a housing with pressure, drain channels and open channels, tributeby criticise the spool, the Electromechanical transducer with the deflector flap at anchor, inkjet amplification stage having two discharge nozzles and two receiving holes, respectively, connected by a hose with potrzebie cavities valve, filter pressure hydroline to the nozzles, according to the invention the jet amplifier made in the form of two cylindrical elements, with a gap installed coaxially in the housing, with the ends facing each other, the cylindrical elements are made grooves for placing the deflector flaps, and the side cylindrical surface with each groove of the cylindrical element coaxially completed discharge nozzle and the receiving hole, with the opposite groove side of the cylindrical elements have a threaded end that screw futorki and external thread futorki screwed into the case, while the thread pitch in CDF is truncated and at the end of the cylindrical elements are made different.

The essence of the invention is illustrated by the drawing, which shows a diagram of the electrohydraulic amplifier with mechanical feedback valve position.

Electrohydraulic power amplifier with mechanical feedback position of the valve includes a housing 1 with a pressure of 2, drain 3 channels and open channels 4, tributeby criticise the spool 5, the Electromechanical transducer 6 with the deflector flap 7 on the armature spring mechanical feedback 8, which is connected via a ball valve, jet amplifier having two discharge nozzles 9 and 10, two receiving holes 11 and 12, respectively, connected by a hose with potrzebie cavities 13 and 14 of the valve, the filter 15 in the pressure hydroline to the nozzles. Inkjet amplification stage is executed in the form of two cylindrical elements 16 and 17, with a gap installed coaxially in the housing 1, with the ends facing each other, a cylindrical elements made grooves for accommodation of deflection of the valve 7, and the side cylindrical surface in the groove of each cylindrical element is made discharge nozzles 9 and 10 and the receiving apertures 11 and 12, located coaxially opposite each other, with the opposite groove side of the cylindrical elements are provided with threaded end, which screw is etorki 18 and 19, and the thread on the outer surface of futarchy screwed into the case, while the thread pitch in the body and the end of the cylindrical element is made different.

Electrohydraulic amplifier operates as follows.

When the supply pressure of the pressure fluid in the pressure channel 2 supply hydrophane pressure head moves to the right edge of the left shoulder and the left edge of the right shoulder of the valve 5 and through the filter 15 to the discharge nozzles 9 and 10. In the drain channel 3 supply hydrophane served the pressure discharge of the working fluid which is supplied to the left and right edges of the middle collar of the valve 5 and then to the cavity deflector flap 7, the Kinetic energy of the jet of working fluid from the discharge nozzles 9 and 10 is converted into potential energy of pressure of the working fluid in potrzebuj cavities 13 and 14 of the spool 5 through the messages with their respective receiving holes 11 and 12 in the cylindrical elements 16 and 17.

In the absence of the supply of electric control signals to the Electromechanical transducer 6 deflector flap 7 is in the neutral position and equally obscure both discharge nozzles 9 and 10 in the cylindrical elements 16 and 17. In this case, the pressure of the working fluid in potrzebuj cavities 13 and 14 will be equal and the valve 5 is at rest in a neutral position.

When applying electrical the CSO control signal of a certain polarity and values in the Electromechanical transducer 6 anchor with scanning valve 7 is shifted, overcoming the force of the feedback spring 8, for example, to the left from the neutral position, and the flap obscures the free flow of the liquid from the discharge nozzles 9 into the receiving hole 11 in the left cylindrical element 17, which reduces the working pressure in padderzevay cavity 13 of the spool 5. In this position the deflector flap 7 in the cylindrical element 16 opens the free flow of the liquid from the discharge nozzles 10 into the receiving hole 12, which leads to increased operating pressure in padderzevay cavity 14 of the spool 5. Under the action of differential pressure in the cavities 13 and 14 of the spool 5 moves to the right, pulling the ball of the feedback spring 8, this creates a torque on the anchor Electromechanical transducer 6 is proportional to the amount of displacement of the spool 5 from the neutral position. This moment is a torque forces caused by an electrical control signal. As soon as these moments are equal, the valve 5 will stop in a position that is proportional to the magnitude of an electrical signal, while in the right cavity 4 is the supply pressure, and in the left cavity 4 - pressure drain.

When applying an electrical control signal of reverse polarity to the Electromechanical transducer 6, the operation of the electrohydraulic amplifier is similar, zo is otic 5 displaces in the opposite direction, tracking his position value and the polarity of this electrical signal and opening the corresponding throttling of the open edges of his shoulders.

The magnitude and direction of fluid flow passing through the throttling window on the edges of shoulders of the spool 5 electrohydraulic amplifier is determined by the value and polarity of the electrical control signal applied to the Electromechanical transducer 6.

Electrohydraulic power amplifier with mechanical feedback valve position, comprising a housing with pressure, drain channels and open channels, tributeby cylindrical spool, the Electromechanical transducer with the deflector flap at anchor, inkjet amplification stage having two discharge nozzles and two receiving holes, respectively, connected by a hose with potrzebie cavities valve, filter pressure hydroline to the nozzles, wherein the ink-jet amplifier made in the form of two cylindrical elements, with a gap installed coaxially in the housing, with the side end faces, facing each other, a cylindrical elements made grooves under the placement of the deflector flaps, and the side cylindrical surface in the groove of each cylindrical element coaxially completed discharge nozzle and p is Yemen hole, with the opposite groove side of the cylindrical elements have a threaded end that screw futorki and external thread futorki screwed into the case, while the thread pitch in the body and the end of the cylindrical elements are made different.



 

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