SU744154A2 - Electrohydraulic vortex-type transducer - Google Patents

Description

one

The invention is intended to be used in the control circuits of electro-hydraulic and electropneumatic automatic control systems.

Basically auth. St. No. 525812 describes an electro-hydraulic vortex converter, in a vortex chamber of which an adjustable electrical voltage is applied directly to the swirling flow by means of electrodes, which are the lateral cylindrical wall and one of the ends of chamber 1.

The disadvantage of it is the low efficiency of flow control.

The purpose of the invention is to increase the sensitivity of the converter.

The goal is achieved by the fact that a third electrode is installed at the outlet of the converter.

The converter circuit is shown in FIG. 1 and 2.

The converter contains nntani 1, control 2 channels, a vortex chamber 3 with a cylindrical metal wall — the first electrode 4 and the end caps 5 and 6. There is a second electrode 7 with a pin 8 in one nz covers, and a third electrode 9 in the other.

The operation of the converter is carried out as follows.

The Qn feeds and Qy controls of the dielectric fluid (e.g., transformer oil) flow, respectively, through the channels 1 and

5 2 into the vortex chamber 3, in which a pre-swirled flow is formed in the space between the side cylindrical metal wall-electrode 4 and the end caps 5 and 6. Both

10 end caps are made of insulating material. A thin metal circular disk, an electrode 7, is fixed inside the flow-through chamber, fastened by means of a threaded stud 8 on the upper end cap. Output adjustable notes of fluid flows through the metal sleeve electrode 9 with thread, fortified in the bottom end cover. A thin circular disk and a cylindrical metal wall form one pair of electrodes, to which a control electrical voltage Ui is applied. The metal sleeve and the side metal cylindrical wall form

25, a second pair of electrodes to which a control electrical voltage f / 2 is applied (see Fig. 1).

When an adjustable voltage Ui is applied between the electrodes 7 and 4 (Fig. 1)

30 a radial electric field occurs

ET, directed along the radius r in the system of cylindrical coordinates given here. By its spatial location in the flow part of the vortex chamber, this electric field acts on the peripheral portion of the previously swirled fluid flow. When the voltage t / i is of the order of (10-20) 10 V and the dielectric liquid, a cold discharge of the corona type arises and a unipolar flow of ions of the sign of the disk potential is formed. Electrohydrodynamic interaction of unipolar ions directed from the disk to the lateral cylindrical wall occurs with neutral molecules of the previously twisted liquid in the peripheral region, as a result of which the intensity of swirling of the fluid flow changes. However, with such electrodynamic interaction, not all ions that emerged from the disk reach the wall. A part of them is carried away by a neutral flow of swirling liquid from the interelectrode gap to the exit along the path resulting in its velocity vector 1 / (see the left part of Fig. 2, where the vector V is indicated by a dotted line). The ions carried by the stream form the so-called convective current of carry-over. Simultaneously with the radial electric field Eg, at the exit section of the vortex chamber, an electric field opposite to it is created. The exit section of the flow part of the vortex chamber is called the section located between the output metal sleeve and the circular disk. When electrical voltage Uz is applied between the metal output sleeve and the lateral cylindrical wall, an electric field appears between the disk and the sleeve, the picture of which is shown at the polarity of the voltages t / i and Uz in the left part of FIG. 2

Each vector of the intensity of this field ЕБ can be decomposed into two components (see the right half of Fig. 2): it is ush, and the EH is perpendicular to the radial vector on the periphery of the EG. This component is ush, but does not produce a change in the intensity of the swirling of the pre-swirling fluid flow at the exit section during the interaction with the yen of the fan; component Er, opposite to the radial vector on the periphery of the EG. This component of the electric field, coinciding over the greater part of the output section with the direction of the vector of the flow velocity of the fluid Y, changes the intensity of the swirling of the previously swirled flow of the fluid. Numerous experimental studies have shown that the twist intensity varies greatly depending on the potential of a metal hub. As a result of this electrodynamic interaction of the electric fields at the peripheral and output sections with the flow of the pre-swirling liquid, the intensity of the swirling changes and, as a result, the flow rate through the vortex chamber changes. The quantitative change in consumption was determined by the following formula;

f / 1 0

/, f about

-Q,

Other QB

C / 2 0

/ 2фО

f /, 0

where QBHX is and Qebix

- value

g / 2fO / -, o

output costs at, and 6i 0, respectively.

An experimental removal of the static characteristics of an electrohydraulic vortex converter that implements the proposed method was carried out. Experimental conditions: liquid-oil transformer at Н Т Т 330 ° К; feed pressure, 8. 10 Pa; The polarity of the central electrode is negative. The polarity of the output sleeve significantly affects the magnitude of the output signal (Svy).

The proposed electrohydrodynamic flow control method by varying the spin intensity of the pre-twisted liquid flow in the peripheral and output sections of the flow part of the vortex chamber allows increasing the control efficiency, improving the operation reliability of the electro-hydraulic drive, as well as improving its electrical signal transformed into a change in the intensity of the swirling flow of a dielectric liquid. bones without intermediate mechanical and electromechanical oieratsy.

The technical and economic advantages of the present invention over similar, related to the most progressive technical solutions are as follows.

The efficiency of controlling the flow of fluid is increased; depth of adjustment; adjustment accuracy; smooth adjustment due to increase in control gain.

The reliability of control systems using devices

implement the proposed method.

The functionality of devices implementing the proposed method increases, the range of application of devices limited by the conversion power is expanded.

Claims (1)

Invention Formula Electro-hydraulic vortex converter auth. St. No. 525812, characterized in that, in order to increase the sensitivity of the converter, therein the outlet is set to third electrode. Sources of information taken into account in the examination 1. USSR author's certificate No. 525812, cl. F 15C 1/08, 1975 (prototype).