SU894830A1 - Electrostatic membrane pump - Google Patents

Description

(54) ELECTROSTATIC MEMBRANE PUMP

one

The invention relates to electric pumps for pumping gases, dielectric and conductive liquids, can be applied in electronic, chemical, metallurgical industries, used for pumping and creating pressure in electrohydrodynamic heat pipes, electroconvective heat exchangers, etc.

A known electrostatic pump containing a dielectric channel in which nonat HO stationary electrodes with an equally small curvature of the surface are perpendicular to the axis, and the electrode is a membrane located between them, the electrodes being equipped with bypass valves.

However, using a known pump, pumping of conductive media is impossible.

Also known is an electrostatic diaphragm pump containing a closed channel, the inlet and outlet ends of which are provided with bypass valves, a dielectric nozzle located perpendicular to the channel axis between the inlet and outlet tortsach, a fixed electrode and a movable

the electrode is a membrane fixed on a bellows and coated on the side of the pumped medium with a dielectric | G2.

Dp pump operation requires an alternating high-voltage source with a pulse frequency of the order of a few hertz, or a high-voltage DC source and a high-voltage switch, i.e.

10 rather complicated system, the reliability of which is low. This reduces the reliability of the pump.

The purpose of the invention is to increase reliability by simplifying the power supply system.

. This goal is achieved by the fact that an electrostatic diaphragm pump containing a closed channel,

The inlet and outlet ends of which are equipped with relief valves, a dielectric socket located perpendicular to the channel axis between the inlet and outlet ends, a fixed electrode and a movable electrode membrane mounted on the bellows and covered with a dielectric on the side of the pumped medium, further comprises a grounded electrode, a 30 background is made a double dielectric material, in the cavity of which there is a movable electrode - a membrane, and the fixed electrode is made in the form of a corona needle, axis of the membrane.

The ratio of the distance between the needle and the membrane to the shortest distance from the needle to the wall of the nozzle is less than one.

At the end of the nozzle there is a hole in which a high-voltage bushing is placed, the diameter of which is 1 1 less than the diameter of the hole.

In order to reduce noise, the grounded electrode is made of electrically conductive rubber.

The drawing shows the design of the pump.

The diaphragm pump consists of a working channel 1 with an overflow valve 2, a cylindrical dielectric body 3, an electrode (needle) 4 with a small radius of curvature, a movable electrically conductive membrane 5, a double dielectric bellows 6 and a grounded conducting electrode 7. Last, to reduce noise at work, can be made of electrically conductive rubber.

The device works as follows.

When a unipolar high voltage is applied to the electrode-needle 4, a corona discharge occurs, as a result of which the membrane 5 is charged. The force of electrostatic attraction of the membrane 5 to the grounded electrode 7 occurs, under the action of which the membrane moves. When the membrane 5 approaches and then touches the electrode 7, the membrane 7 discharges it, and the membrane returns to its original position. The process then repeats. The oscillation frequency of the membrane depends on the magnitude of the corona current and the distance between the membrane and the grounded electrode. The oscillations of the membrane create periodic dilutions and contractions in the working channel of the pump, under the action of which the pumped medium moves due to bypass valves 2. Normal circulation of air in the cavity of the nozzle during the reciprocating motion of the membrane is provided by a hole in its end, the diameter of which is made of a knownly larger diameter than its passage through the hole with a high voltage. input.

 Performing a fixed electrode as a corona needle and adding a grounded electrode to the design allows the pump to be powered by any unipolar high-voltage source, there is no need to have a special switch, which ensures increased reliability of the pump.

The pump is simple to manufacture and does not require the use of expensive materials, it is easy to control, it allows pumping gases, dielectric and conductive liquids.

Claims (4)

1. Electrostatic diaphragm pump containing a closed channel, the inlet and outlet ends of which are equipped with relief valves, a dielectric nozzle located perpendicular to the channel axis between the inlet and outlet ends, a fixed electrode and a movable electrode - membrane mounted on the bellows and covered from the pumped medium dielectric, characterized in that, in order to increase reliability, it contains an additionally grounded electrode, the bellows is made double of dielectric material, in strips of which the movable electrode is located the membrane, and the stationary electrode is made in the form of a corona needle, located along the axis of the membrane. 2. The pump of Claim 1, distinguished from jeM, that the ratio of the distance between the needle and the membrane to the smallest distance from the needle to the wall of the nozzle is less than one. 3. The pump according to claim 1, which is also distinguished by the fact that a hole is made at the end of the nozzle, in which a high-voltage input is placed, the diameter of which is smaller than the hole diameter. 4. Pump according to Claim. 1, characterized in that, in order to reduce noise, the grounded electrode is more electrically conductive rubber. Sources of information taken into account in the examination 1. USSR author's certificate in application W 2710021./25, cl. H 02 N 3/00, 1979.  2. USSR author's certificate in application 2886649 / 24-25, k. H 02 And 3/00, 20.02.80 (prototype)