JPH0736690B2 - Immersion type electromagnetic pump - Google Patents

Description

Description: [Industrial field of application] The present invention relates to an immersion electromagnetic pump suitable for use in pumping out a molten metal.

[Prior Art] FIG. 3 is a front sectional view showing the basic structure of a conventional immersion type electromagnetic pump 1, in which the lower portion of the main body of the electromagnetic pump 1 is immersed in the molten metal 2 and the molten metal 2 pumped up by electromagnetic induction is discharged. It is designed to be discharged from the gutter 3.

In FIG. 3, a fire-resistant cylindrical column 4 is provided at the center of the electromagnetic pump 1, and the shaft center is shared on the outside thereof.
A refractory conduit 5, a metal protective tube 6 covering the outer periphery of the conduit 5,
A hollow cylindrical casing 7 and a refractory material 8 that covers the outer periphery of the casing 7 are sequentially arranged. The columnar body 4 contains an iron core 4a made of pure iron or silicon iron for building a refractory and for forming an internal magnetic path. Further, for example, six comb-shaped induction iron cores 9, 9 ... Are radially arranged on the outer circumference of the protection tube 6, and an annular coil 10 is fitted in a groove provided on the inner circumference of these iron cores 9. ing. These coils 10 are fitted on the outer circumference of the protection tube 6, and
When is excited with a predetermined phase difference, the molten metal 2 is pumped up through an annular passage 11 formed in the pipe of the cylindrical body 4 and the conduit 5, and is discharged from the tapping gutter 3.

[Problems to be Solved by the Invention] By the way, the immersion electromagnetic pump 1 described above may be used for pumping out a molten metal having a high melting point (700 ° C. to 800 ° C.) such as aluminum (Al) or an Al alloy. Further, the iron core 4a self-heats due to the eddy current generated by the operation, and as a result, when the above-mentioned high melting point molten metal is pumped out for a long time, the temperature of the iron core 4a is caused by the heat transmitted from the molten metal and the heat generated by itself. Or it may go up to near the Curie point. On the other hand, the magnetic permeability of pure iron or silicon iron decreases as the temperature rises as shown in FIG. 4, and when the temperature reaches the Curie point, the magnetic permeability becomes 0, that is, it becomes a completely non-magnetic material. Therefore, the conventional electromagnetic pump has a drawback that the efficiency of the pump deteriorates when the molten metal having a high melting point is pumped out for a long time.

The present invention has been made under such a background, and an object thereof is to provide an immersion type electromagnetic pump in which the efficiency of the pump does not decrease even if the molten metal of the refractory metal is pumped out for a long time.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides an alloy having a higher Curie point than pure iron or silicon iron in the refractory columnar body and a small change in magnetic permeability with temperature. It is characterized by forming an iron core.

[Operation] According to the above configuration, even if the temperature rises, the magnetic permeability of the iron core does not decrease and the efficiency of the pump does not decrease.

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

The immersion type electromagnetic pump according to the first embodiment is the third embodiment described above.
Iron core 4a is different from the conventional immersion type electromagnetic pump 1 shown in the figure.
Instead of conventional pure iron or silicon iron, an alloy having a higher Curie point than that of pure iron or silicon iron and a small change in magnetic permeability with temperature is used as the metal forming the.

This alloy contains cobalt (CO) and vanadium (V)
The magnetic permeability is 49% and 2%, respectively, and the magnetic permeability is almost constant up to near the magnetic transformation point of 920 ° C. as shown in FIG. By forming the iron core from such an alloy, the high-melting-point molten metal is pumped out for a long time, and even if the temperature of the iron core rises, the magnetic permeability of the iron core does not decrease, so the efficiency of the pump does not deteriorate.

Next, FIG. 2 is a sectional view showing the structure of the main part of an immersion electromagnetic pump according to the second embodiment of the present invention. In the figure, 20 is a refractory cylinder, which corresponds to the reference numeral 4 shown in FIG. The second embodiment differs from the first embodiment in that a refractory columnar body 20 has a long core 21 formed of the alloy (CO: 49%, V: 2%) and having a small diameter. The point is that there are multiple. In this case, the iron cores 21, 21, ... Are spaced from each other and are not in contact with each other.

As a result of such a configuration, generation of eddy current during operation is suppressed, eddy current loss is reduced, and pump efficiency is improved. Further, the total volume of the iron core 21 becomes smaller than the conventional one, and the material cost becomes low.

[Effects of the Invention] As described above, according to the present invention, since an iron core made of an alloy containing 49% of cobalt and 2% of vanadium is provided inside the refractory columnar body, it is possible to obtain a structure similar to that of Al or Al alloy. Even if the temperature of the iron core rises after pumping out the high melting point molten metal for a long time, the efficiency of the pump does not deteriorate. Further, conventionally, the electric power was increased to compensate for the decrease in the efficiency of the pump due to the rise in temperature, but according to the present invention, a constant pumping amount can be obtained irrespective of the change in temperature, so that it can be adjusted according to the rise in temperature. The power to increase power is lost,
Power can be saved.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the temperature and the magnetic permeability of the iron core used in the first embodiment of the present invention, and FIG. 2 is a sectional view showing the configuration of the main part of the second embodiment of the present invention. FIG. 4 is a front sectional view showing the basic structure of a conventional immersion type electromagnetic pump 1, and FIG. 4 is a graph showing the relationship between the temperature and magnetic permeability of an iron core used in the immersion type electromagnetic pump. 2 ... Molten metal, 5 ... Refractory conduit, 7 ... Casing,
9 ... Comb-shaped induction core, 10 ... Annular coil (induction coil), 11 ... Molten metal pumping passage, 20 ... Refractory cylinder, 21 ... Iron core.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Nakai 100 Takegahana-cho, Ise-shi, Mie Shinko Electric Co., Ltd.Ise factory (72) Hideo Ikeguchi 100 Takegahana-cho, Ise-shi, Mie Ise factory Shinko Electric Co., Ltd. (56) References: Actual development Sho 56-123792 (JP, U)

Claims (1)

[Claims] 1. A refractory cylinder, a refractory conduit and a hollow cylindrical casing, which are sequentially arranged concentrically from the inside to the outside, and an annular induction coil fitted to the outer periphery of the conduit. And a comb-shaped induction iron core that supports the induction coil, in the immersion type electromagnetic pump for pumping the molten metal by electromagnetic induction through the molten metal pumping passage formed between the cylindrical body and the conduit, An immersion electromagnetic pump, characterized in that an iron core made of an alloy containing 49% of cobalt and 2% of vanadium is provided inside the cylinder.