SU1393939A1 - Electrohydraulic booster - Google Patents

Description

: The invention relates to hydraulic automatics and the engine is used in the hydraulic drives of the machines and ((means of transmission.

An izyesthen electrohydraulic amplifier, containing a two-speed, valuable hydraulic booster with a distribution valve and an electromechanical converter, is a kinematically connected 10 yen to one of the movable covers.

with a fixed sleeve and movable covers, divided by a piston into two cavities 5 connected to the electrodes of a control signal source, of which one is filled with mercury and the other with electrolyte, and a set of through capillaries fixed in the piston, with one valve rigidly connected to one of the movable covers

f zaslonkaz-sh the first stage of the hydraulic booster, interacting with a sop- Lani Cl J,

i The disadvantages of this amplifier in jjiHioTCH are low speed and large dimensions, associated with the presence of Hydrolines of communication, having a large

Inu and with a low value of own 1st frequency electromechanical converter.

Also known is an electrohydraulic amplifier containing a two-stage | 1st power amplifier, with a fjAiM spool valve and an electromechanical | 1 converter 5 connected to the electrical source of the control unit; the signal is kinematically connected to the throttle; - iodating hell with nozzles, hydraulically connected to the end chamber; No distributor valve of the second power steering cascade, connected via fjeHHbif-iK via chokes to the source of working fluid {2ji,; The disadvantages of the known amplifier 1 are also low speed 1 due to the low value of the natural frequency of the electromechanical transducer and large ga.arity.,

OBJECTIVE OF THE INVENTION IMPROVE PERFORMANCE TO CONTAINMENT OF DIMENSIONS.

This tsio7b is achieved by the fact that a TiTO in an electrohydraulic amplifier contained a two-stage hydro-amplifier with a pair of gold-H1-JON and an electromechanical converter; g edousilitel, placed in chambers of the drain and interacting with the nozzle, hydraulically sz for nym: “with the end chambers of the distributive golden booster of the second stage of the hydraulic booster connected whose fluid elektrOlmehanichesky transformations verters Bb full as itslindra

five

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five

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the other is equipped with a pusher hydraulically connected & 1 with another movable cylinder head of an electromechanical converter.

The drawing shows a diagram of the electro-hydraulic amplifier.

The amplifier contains a two-stage hydraulic booster (not labeled) with a distribution spool 1 of the second cascade and an electromechanical transducer made in the form of an idler 2 with a fixed sleeve 3 and SUB-LINES A and 5 separated by a piston 6 on cavities 7 and 3 connected to electrodes 9 and 10 sources (not shown) of the control signal. The cavity 7. is filled with mercury, and the cavity 8 with electrolyte, in the piston 6 a set of through capillaries is fixed (not shown). The single-stage valve 11 of the Hydraulic Booster is rigidly connected to the lid 4, placed in the discharge chamber 12 and interacts with the nozzle 13s hydraulically connected with the end chamber 14 of the spool 1 connected through the throttle 15 to the source (not shown) of the working fluid. The valve 16 of the other stage of the hydraulic booster is equipped with a pusher 0 17, a hydraulically connected hydraulic line 18 with a cylinder head cover 5 2 placed in the discharge chamber 19 and connected to the nozzle 20 hydraulically connected with the end chamber 21 of the spool 1 connected through the throttle 22 to the source of the working fluid. The spool 1 is spring-loaded springs 23 and 24. The throttles 15 and 22 are connected to the source of working fluid through the filter 25.

Electrohydraulic amplifier works as follows.

In the initial position, the valves 11 and 16 are at equal distances from the nozzles 13 and 20 and the valve 1 is in the middle position. When a control signal (voltage) is applied to electrodes 9 and 10, the surface tension of mercury changes in bands

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These 7 and its menisci, displaced along the capillaries, create, for example, increased pressure in the cavity 8 with electrolyte, as a result of which the cap 4 with the valve 11 is displaced to the left. At the same time, the gap between the valve 11 and the nozzle 13 decreases and the flow rate of the working fluid through the nozzle 13 decreases, at the same time the cover 5 and the pusher 17 are displaced in the direction of increasing the gap between the gate 16 and the nozzle 20, and the flow of the working fluid through the latter increases.

Thus, in the chambers 14 and 21, a pressure differential is formed to ensure the displacement of the spool 1 to a predetermined position. Increase or decrease of potential on

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electrodes 9 and 10 leads to a further change in the gaps between the nozzles 13 and 20 and the flaps 11 and 16 and, consequently, to a change in the position of the spool 1.

Performing an electromechanical transducer in the form of volumes of mercury and electrolyte and a set of end-to-end caps allows you to obtain the necessary: iHMb e to move force valves with small dimensions of cylinder 2 without using intermediate displacement transducers.

The use of the invention in hydraulic drives of machine tools and vehicles will increase their speed and reduce size, thereby increasing the efficiency of their use.

Claims (1)

ELECTRIC HYDRAULIC FORCE- TELE, containing a two-stage hydraulic booster with a distributor valve and an electromechanical converter connected to the electrodes of the control signal source and kinematically connected to the dampers at the first stage of the hydraulic booster, times trash in the drain chambers and interacting with nozzles hydraulically connected to the end chambers of the distributor spool of the second cascade of the hydraulic booster connected via throttles to a source of working fluid, characterized in that, in order to increase speed and reduce overall dimensions, the electromechanical converter is made in the form of a cylinder with a fixed sleeve and movable covers, divided by the piston into two cavities connected to the electrodes of the control signal source, one of which is filled with mercury ew, and the other with electrolyte, and a set of through capillaries, ·. fixed in the piston, and one valve is rigidly connected to one of the movable covers, and the other is equipped with a pusher hydraulically connected to the other movable cylinder cover of the electromechanical converter.