Electrohydraulic distributor

 

The dispenser is designed to control the flow of fluid in the hydraulic systems of aircraft. The dispenser includes a housing located in the housing allocation element to control the flow of the working fluid, and a piezoceramic actuator, one end of which is fixed in the housing, and the other set, with the ability to move in the housing, the piston associated with the distribution item through the multiplier. The multiplier is made in the form of a curved elastic plate, one end of which is mounted for engagement with the piston, the other with an emphasis in the housing, and the middle part is connected with the junction element, the curved elastic plate provided with a rigidly connected with its ends by transverse plates secured in the housing. The technical result is increased reliability. 1 Il.

The invention relates to the field of hydraulic drive and can be used, for example, in hydraulic systems of aircraft. From the patent literature known electro-hydraulic valve, comprising a housing located in the housing allocation element to control the flow of the working fluid is made th fixed in the housing, and the other is installed between the nozzles with the possibility of overlap as a flap [1].

The drawbacks of such a dispenser is that it is overly low power, given the small force developed bimorph plate that does not allow you to use it in highly dynamic hydraulic drives.

From the patent literature known and electro-hydraulic valve, comprising a housing located in the housing allocation element to control the flow of the working fluid, and a piezoceramic actuator, one end of which is fixed in the housing, and on the other set, with the ability to move in the housing, the piston associated with the distribution item through the multiplier (2). In this dispenser, the multiplier is made hydraulic, which eliminates the stability of the connection of the piezoceramic actuator with control element due to the inevitable leakage of the working fluid multiplier. In addition, the movement of the piston, mounted on a piezoceramic actuator is not more than tens of microns, and therefore the hydraulic multiplier, which should provide a displacement distribution of the element in units of millimeters, has considerable dimensions. That the valves blast tube and a flat slide valve.

The technical problem of the invention is to enhance reliability electrohydraulic distributor, simplified design and reduced dimensions.

The solution of a technical problem is provided by the fact that the electrohydraulic valve, comprising a housing located in the housing allocation element to control the flow of the working fluid, and a piezoceramic actuator, one end of which is fixed in the housing, and the other is mounted for movement in the housing, the piston associated with the distribution item through the multiplier, the latter is in the form of a curved elastic plate, one end of which is mounted for engagement with the piston, the other with an emphasis in the housing, and the middle part is connected with the junction element, moreover, the curved elastic plate provided with a rigidly connected with its ends by transverse plates secured in the housing.

The drawing shows a structural diagram of an electrohydraulic valve.

Electrohydraulic valve includes a housing 1 located in the housing 1 distribution element 2 to control the flow of the working fluid and peremesheniya in the housing 1, the piston 6, associated with the distribution element 2 through the multiplier 7, made in the form of a curved elastic plate 8, one end 9 of which is mounted for cooperation with the piston 6, another 10 - prop 11 in the housing 1 and the middle portion 12 is associated with a distribution item 2.

Curved elastic plate 8 provided with a rigidly connected with its ends 9, 10 of the transverse plates 13, 14, fixed in the housing 1.

In the design shown in the drawing, the distributor element 2 made in the form of oppositely arranged nozzles 15, 16, and a curved elastic plate 8 is installed between the nozzles 15, 16 with the possibility of overlap as a damper. Nozzles 15, 16 are connected directly with the end command cavities 17, 18 formed with the housing 1 of the valve 19, and the pressure hydroline 20 through the inductors 21, 22. The valve 19 has a feedback sensor 23. Electrohydraulic valve operates as follows. When applying voltage to the piezoelectric actuator 3 is an increase in its length, causing the piston 6 is moved in the housing 1, compressing the elastic plate 8 multiplier 7. Because of the small size of arrow deflection plates 8, minor, measured in tens of the Tina 8, sufficient for the function of the control flow of the working fluid. Neutral provisions of the distribution element 2 is some constant value of the voltage supplied to piezoceramics actuator 3. The control action is carried out by raising or lowering the voltage corresponding to the neutral position.

The proposed control strategy in addition to device type nozzle, the valve can be used for direct displacement distribution elements, such as jet tube, a cylindrical or a flat slide valve, ball or conical normally open or closed valves.

Due to the absence in the first stage electrohydraulic distributor traditional torque motor, the natural frequency of the moving system is limited by its high moment of inertia, a significant effort piezoceramic actuator high rigidity of the elastic plate, the frequency bandwidth of the distributor reaches 1000 Hz.

Transverse plates 13, 14, fixed in the housing 1, eliminate the friction between the curved elastic plate and stops in the housing 1 and the piston 6, providing no wear and stability character/044 from 16.12.95,

2. The Germany Application No. 3714337 C2, F 15 B 13/044.

Claims

Electro-hydraulic valve, comprising a housing located in the housing allocation element to control the flow of the working fluid and piezoelectric actuator, one end of which is fixed in the housing, and the other is mounted for movement in the housing, the piston associated with the distribution item through the multiplier, wherein the multiplier is made in the form of a curved elastic plate, one end of which is mounted for engagement with the piston, the other with an emphasis in the housing, and the middle part is connected with the junction element, and a curved elastic plate provided with a rigidly connected with its ends by transverse plates secured in the housing.

 

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