SU743145A1 - Membrane pump for dielectric media - Google Patents

Description

The invention relates to electric pumps for pumping dielectric liquids and gases, can be applied in electronic, chemical, metallurgical industries and used for transferring and creating pressure in electrohydrodynamic heat pipes, electroconvective heat exchangers, and so on. Electric pumps are known for pumping dielectric fluids, which are a multitude of electrodes connected to a series of electrohydrodynamic (EHD) types. However, the use of needles accelerates aging and reduces the life of the working substance during its multiple pumping, increases the likelihood possible gas emissions with them. The presence of the latter may, in particular, contribute to the formation of traffic jams in the narrowing of the channel, as well as to a violation of the stability of flow-pressure characteristics. When pumping low-boiling dielectrics (for example, freons), it is also possible to boil the nz-ea joule heat-up liquid at the tip electrodes. Electromechanical displacement pumps are known, with no irreversible effect on the pumped medium. A diaphragm pump is known, comprising a housing in the form of a channel with inlet and outlet ends between which a membrane is located, the ends and the membrane being equipped with bypass valves 2. In this pump, the movable membrane element is driven by an electromagnetic drive, for which the membrane is made of ferromagnetic material, and with a small gap from it electromagnets are located, powered by alternating current. The disadvantages of the pump are the relative strength of the electrical energy consumption. The purpose of the invention is to simplify the design and reduce energy consumption. The goal is achieved by the fact that in a diaphragm pump for dielectric media, comprising a housing in

the channel with the input and output ends, between which the membrane is located, the ends and the membrane are provided with overflow valves, the channel is made of dielectric material, and the ends and the membrane are of conductive material, the ends are connected to the full source of constant high voltage, and aperture — To the same source through a switch that periodically changes its polarity.

° Figure 1 is a schematic diagram of a diaphragm pump for dielectric media.

The pump consists of a dielectric channel 1 with ends 2 that function as electrodes, a membrane 3 of conductive material, and valves 4.

The pump works as follows.

When applying the potential difference to the stationary electrodes 2 and periodically connecting the electrode-membrane 3 to one of the stationary electrodes, the electrode-membrane oscillates under the action of electrostatic pressure forces and elastic deformation forces. As a result, the pumped medium is purposefully moved along the dielectric channel 1. The unidirectional movement of the pumped medium is created by a system of relief valves.

The diaphragm pump for dielectric media is simple in design and manufacture and does not require the use of expensive materials. The pump consumes little electrical power. Thus, when the operating voltage on the electrodes is, for example, 50 kV, the currents in the interelectrode gap are 10–20 µA. With such a low power consumption, the pump nevertheless allows a significant head to be obtained, ensuring a high pumping efficiency.

The pump can pump both liquid and gaseous dielectrics.

If necessary, the structure can be made multi-stage.

Claims (1)

1.J. of AppI Physics V. 30, No. 7, p. 984-994, 1959. 2, USSR author's certificate 646086, cl. F 04 B 43/04, 1977 (prototype).