SU1145881A1 - Inductor of linear induction pump - Google Patents

Abstract

A LINEAR INDUCTION PUMP INDUCTOR containing a magnetic core and three-phase main and auxiliary windings placed on it, characterized in that, in order to reduce the power consumption and dimensions, the auxiliary winding is located after the main in the direction of the running magnetic field and its pole division made in accordance with the relation f, (tS {), where C, and 2. pole division of the main and auxiliary windings; S .- slip .dl main winding. -.

Description

This invention relates to an MHD technique. It can be used in electromagnetic induction pumps for pumping fast metal neutron coolants, as well as in other installations for technological purposes.

Linear induction pumps are known, the main components of which are the external magnetic core made up of electrical steel sheet, the winding laid into the grooves of the external magnetic core, the internal magnetic circuit and the linear channel.

SP 00 00

internal section, covering the internal magnetic circuit. The three-phase winding creates a magnetic field running along the channel8 when interacting with currents induced in the liquid metal, an electromagnetic force appears, ensuring the movement of the liquid metal in the pump channel.

The disadvantage of such pumps is the increased energy consumption due to the uncompensated longitudinal end effect.

It is known that in order to weaken the influence of the longitudinal end effect in linear induction machines, use is added: to compensate for ioHHie three-phase windings. In this case, the compensation winding is either superimposed on the main working winding so that the onset of the winding of the windings coincide, or the compensation winding is placed in front of the operating but the movement of the traveling magnetic field.

Also known is the inductor of a linear asynchronous motor, which contains the magnetic core i and the main and auxiliary windings placed on it. The auxiliary compensation winding is located in front of the main winding and is connected in series with it. In such an inductor, the end of the compensation winding is connected to the beginning of the working pole, the magnitude of the pole division of the compensation winding is larger than that of the working winding.

When using electromagnetic pumps in the main circuits of NPPs, there is an acute problem of ensuring the removal of residual heat after de-energizing the main power source: switching to a lowering mode and -sh mode of discharge: i; willows with a flow rate of 10-125% of nominal ( so-called vybeg),. The mass of the moving parts of the liquid metal in the electromagnetic axis is c-less dense than the mechanical one, and therefore the pick-up time is very short (l -; 2 s). As a result, the auxiliary winding of the pump should be, for example, similarly and lowering the flow. Constantly connected to an autonomous source of power supply E1 and 5 in order to exclude interruption in power supply. However, powering the pump according to this scheme has a significant drawback, since the auxiliary jack, while being constantly under voltage, consumes electricity from the network during the operation of the main winding of the pump, which increases the power consumption of the whole pump.

The aim of the invention is to reduce mobility. consumed by the pump, and the dimensions of the pump by creating a DO of the auxiliary winding of the speed pump, the magic 1bit floor V;

U.y

equal to the velocity of the metal V, in the zone os

new winding of the pump.

The goal is to reach: -a due to the tog (1 „that in the inductor, 1P-1 of the

of the induction pump, the auxiliary winding is located after the main in the direction of the movement of the traveling magnetic field 5 its pole division is made in accordance with the ratio

L

BUT

/ h G / - 1 p -1

Cg t-1. 1-b,).

where c | and c2 - pole

division of the main and auxiliary flow; S is the slip for the main winding With this pump construction, the speed of the magnetic field of the auxiliary winding V / (f is the frequency of the network) is equal to the speed of the liquid metal Vn, the main winding of the pump operating at the nominal point at slip S (. there is no interaction with the moving metal and the auxiliary winding consumes MPHIH minimum power, it is necessary only to cover the copper loss of the winding and the steel magnetic conductor. When the main winding turns off, the speed of the liquid metal in the channel quickly The sub-winding begins to consume electrical power from the networks, providing a mode of low circulation circuit B.

The drawing shows the inductor ingguhgionnogo cylindrical pump, a cut,

The pump contains an external magnetic circuit 1, in the grooves of which a three-phase main winding 2 with polar division & is laid. and auxiliary three-phase winding 3, extruded with pole 1 division with (-S} i.

Both windings are placed on the outer magnetic core 1, and the auxiliary winding 3 is located behind the main winding 2 in the direction of travel of the magnetic field (liquid metal); and have a common working channel 4, covering the inner magnetic core 5. When the voltage is turned on, the main winding 2 of the pump and the auxiliary winding 3 form an electromagnetic field that runs along a channel. Under the influence of the traveling magnetic field it of the annular channel 4 in (zznikayut;: ring; e currents; when interacting; k; oors: with magnetic zero, an axial electromagnetic force is formed, alternating the metal from the input to the output. Since the polar division of the auxiliary winding 3 according to the relation with (tS.)

lil1

h, then at a nominal flow rate and

consequently, the rated slip for the main winding, the slip for the auxiliary winding will be zero. Under these conditions, the magnetic field of the auxiliary winding does not interact with the moving liquid metal and the power consumed by it is minimal. When the main winding of the pump is disconnected, the speed of the metal in the channel V.y drops rapidly and, as soon as it becomes less than the speed of the magnetic field of the auxiliary winding, the latter begins to consume power from the network from the stand-alone SOIHHKa necessary to provide; little metal circulation in the circuit.

Thus, using this technical solution, it is possible to reduce power consumption by reducing power, consumed by the auxiliary winding of the pump, carry out a cooling mode, and also reduce the weight of active materials, in particular electrical steel, by reducing the length of the magnetic circuit under the auxiliary winding of the Hd pump with a smaller pole division.

Claims (1)

LINEAR INDUCTION PUMP INDUCTOR containing a magnetic core and three-phase main and auxiliary windings placed on it, characterized in that, in order to reduce power consumption and dimensions, the auxiliary winding is located after the main in the direction of movement of the traveling magnetic field, and its polar division is performed in according to the ratio ^ ₂ = €, (1-3 _{ ), where С, and - pole divisions of the main and auxiliary windings; glide for the main winding. $ cross section, covering the inner magnetic core. The three-phase winding creates a magnetic field that runs along the channel, when interacting with currents induced in the liquid metal, an electromagnetic force appears that ensures the movement of the liquid metal in the pump channel. The disadvantage of such pumps is increased energy consumption due to uncompensated longitudinal end effect.