SU1223817A1 - Cylindrical linear induction pump - Google Patents

Description

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The invention relates to magneto-hydrodynamic technology (MHD-technology), in particular to the improvement of electromagnetic induction pumps. It can be used in pumps for pumping d-metal coolants in the circuits of atomic stations with fast neutron reactors, research liquid metal benches

metallurgical industry, as well as dl, other technological purposes ..

The aim of the invention is to eliminate fluctuations in flow and pressure and to improve the energy characteristics of the pump due to the location in the shunt areas between pump sections of additional poles whose coils are connected in series with phase I; zones of the corresponding coils located on the inlet side of each section of the pump.

Figure 1 shows a longitudinal section of an electromagnetic induction pump; Fig. 2 is a diagram of the connection of its winding.

The electromagnetic pump contains a flow channel 1 of annular cross section, an inductor consisting of two sections 2 with shunt sections 1) at the outlet after each section. In the slots of the 3 sections, the main three-phase excitation winding is laid in the form of disk coils k with the number of coils D of phase zone 2, the number of turns in coil UJ |, the coils of which are connected in series within phase zones A, 1, B, X, C, J / and draw; four poles each. In the shunt sections there are grooves of 5 additional poles in which coils 6 are located. The number of coils in the phase zone at the additional poles Wcj.h is chosen in accordance with the formula

W 2111 (фf5). K 2.51, ...- and

at

where and is the groove number of the additional pole in the direction of movement of the liquid metal; To coefficient, (, S;, RU, magnetic Reynolds number Phase zones A, l, 8 and A ,, 7,6 additional poles are connected in series with the phase zones A

Z, 6 psrvty on the input of the liquid metal of the pole divisions of the inductor sections.

When the voltage is turned on, the three-phase winding of the pump sections 2, consisting of the coils 4, laid on the slots 3, produces a traveling magnetic field. Under the action of a traveling magnetic field in a liquid metal located in channel 1, ring currents are induced by the interaction of which with the magnetic field an axial electromagnetized force is formed that pumps the metal. When moving liquid metal from inlet to outlet

5 of the pump, after each section, it falls under the zone of the additional pole, where three coils 6 are located in the slots 5, since the pole pressure of the additional poles 1 is selected

five

0

but according to the expression

l L.

and

one.

L -

  1 (1-5), ...

where 5 is the nominal slip of the liquid metal ;,

the pole division of the excitation winding, then the speed m; 1G-nitny field under the additional pole is equal to the speed of the pumped liquid metal. If the velocity profile of the liquid metal is uniform, then the magnetic field of the additional pole does not affect the liquid metal. If the velocity profile is not uniform at the exit of the section, then in those parts of the profile where the speed is less

5 speeds of the booster magnetic field of an additional pole, electromagnetic forces arise that act in the direction of the movement of the liquid metal and accelerate it, and where speed is

0 particles of fluid in the profile are larger than the velocity of the magnetic field; electromagnetic braking forces arise that slow down the movement of the metal. As a result, the profile is aligned.

5 speeds under the additional pole. and in the next section it comes uniform.

In addition, the use of coils with a variable number of turns in addition

50 positive poles, varying in accordance with formula (1), and the inclusion of their phase zones A, Z, B and A, Z, B, j in series with the coils of the phase zones A, Z, 6 of the first pole divisions

55 s | V1y 2 allows you to avoid an additional increase in current and overheating of the input coils, due to the weakening of the magnetic field at the input.

due to the influence of the longitudinal end effect at large magnetic Reynolds numbers K 1 and to avoid the non-uniformity of its phase distribution.

Thus, in the proposed device, due to additional poles in relatively short sections using a magnetic field, it is possible to stabilize the flow and avoid fluctuations in the flow, pressure and overheating of the windings on the input coils and operate it at higher values of the linear current load, and also increase its efficiency. . Operating the pump at higher electromagnetic loads will allow it to be raised by 3-57 ,.

Claims (2)

CYLINDRICAL LINEAR INDUCTION PUMP, containing a channel with liquid metal and a sectioned inductor, including coils of the main field winding, combined into phase zones and shunting sections of the magnetic circuit at the end of each section, so that and, in order to eliminate • fluctuations in pressure and flow rate of liquid metal and improvement of pump energy indicators, shunt sections are made in the form of • additional poles with pole pressure 4) = ^ (1-5), where t is the pole division of the field winding; S is the nominal slip of the liquid metal, the phase zones of the additional poles are sequentially included in the corresponding phase zones of the main winding, lying on the first stroke of the liquid metal in the channel of the pump pole division of the same where W a · " ^{1 W} K turns in the excitation coil; coils in phase zo. sections of the inductor, and the coils are wound with the number of turns _. To the number of coils, the number is not a field coil; the number of coils in the phase zone of the additional poles; the groove number of the additional pole in the direction of movement of the liquid metal; 2 / R _w S - coefficient, magnetic Reynold number - < sa