JPS6130276A - Cylindrical type electromagnetic pump - Google Patents

Abstract

PURPOSE:To improve the magnetical efficiency of a pump by disposing a steel pipe onto a conductive pipe and ladling up a molten metal by the electromagnetic induction through the ladling passage formed between the conductive pipe and the steel pipe. CONSTITUTION:The molten metal infiltrates the inside of the steel pipe 11 through fine pores 12 when the lower part of the cylindrical electromagnetic pump is immersed into the molten metal 10 of lead, zinc, etc. A progressing magnetic field is generated in the ladling up passage 15 formed between the conductive pipe 14 and the pipe 11 when 3-phase AC is impressed to a coil 18. The molten metal 10 rises in the passage 15 by the magnetic effect of the advancing magnetic field and is discharged from a tapping spout 28 into a spout 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cylindrical electromagnetic pump suitable for use in pumping out molten metal.

[Prior art]

Cylindrical electromagnetic pumps are mainly used for pumping molten metal (temperature 500 - eoo'c) made of lead, zinc, tin, magnesium, aluminum, or their alloys, as shown in Figures 2 and 2. Figure 3 shows the basic structure of a conventional cylindrical electromagnetic pump.

In these figures, in the center of the pump is a refractory lumber IV
A cylindrical laminated iron core 2 covered with C is provided, and a refractory conduit 3 is placed on the outside thereof, sharing the same axis as the iron core 2. Eight comb-shaped yokes 4, 4 are installed around the outer circumference of the conduit 3.
... are arranged radially, and the coils 5, 5 ... are inserted from the outside of the annular coils 5, 5 ... fitted into the outer periphery of the conduit 3.
is embedded in. When the coils 5, 5... are excited with a predetermined phase difference, a traveling magnetic field is generated within the conduit 3, and due to this magnetic action, molten metal is formed between the conduit 3 and the refractory lumber 1. It is pumped out through an annular passage 6. In this case, the iron core 2 is used to improve the permeability of the magnetic flux, and forms part of the magnetic path through which the magnetic flux passes. That is, coils 4, 4...
When current is supplied to
A magnetic path is formed: - passage 6 - conduit 3 - yoke 4 - conduit 3 - passage 6 - refractory lumber 1 - iron core 2.

[Problem that the invention seeks to solve]

By the way, the above-mentioned magnetic path includes the refractory lumber 1 on both the outward and return paths, and the magnetic path is lengthened by this amount. As a result, the magnetic resistance increased and the magnetic efficiency of the pump decreased.

In view of the above circumstances, it is an object of the present invention to provide a cylindrical electromagnetic pump with improved magnetic efficiency.

[Means to solve the problem]

This invention was made by focusing on the fact that the melting point of the main molten metals (lead, zinc, etc.) pumped by a cylindrical electromagnetic pump is lower than the melting point of iron. In order to achieve this, a steel pipe that is not covered with refractory lumber is placed inside the conduit, and the molten Q is pumped up by electromagnetic induction through a pumping passage formed between the conduit and the steel pipe.
be a sign.

[For production]

By using steel pipes that are not made of refractory lumber, the magnetic path is shortened and magnetic resistance is reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of a cylindrical electromagnetic pump according to an embodiment of the present invention, in which the lower part of the main body is immersed in molten metal 10 and used as an immersion type electromagnetic pump.

In the figure, reference numeral 11 denotes a steel pipe in the shape of a circle with a closed upper end, and is provided at the center of the pump. A plurality of pores 12, 12, . . . are formed in the upper part of this steel pipe 11. On the outside of the steel pipe 11, an inner ceramic pipe 14 having an entire outer flange 13 at its lower end is disposed with its axis aligned with the steel pipe 11, so that an annular shape is formed between the steel pipe 11 and the inner ceramic pipe 14. A pumping passage 15 is formed. Moreover, between the steel pipe 11 and the inner ceramic pipe 14, arms 16, 16, . . . are provided at the upper and lower parts, respectively.
They are provided at intervals of 90°C, and the axes of the steel pipe 11 and the inner ceramic pipe 14 are aligned throughout.

A thin-walled coil protection tube 1 made of high quality silicon carbide or non-magnetic stainless steel is arranged around the outer periphery of the inner ceramic tube 14.
7 is inserted into the outer periphery of this coil protection tube 17,
A plurality of annular coils 18, 18... are fitted into the coils 18, 18..., and eight comb-shaped yokes 1 are inserted into the coils 18, 18...
9, 19... are fitted from the outside, and the coil protection tube 1
They are arranged radially around the outer periphery of 7. To explain further, the yoke 19Fi is a prismatic body, and one side has a
Concave i′Il perpendicular to the longitudinal direction ¥19FL, 19a...
・is formed. This recess rR19a is fitted into the coil 18, and the side surface is in contact with the outer periphery of the coil protection tube 17. Here, the connection relationships of the coils 18, 18... are R9〒l Sjπ,
By supplying six-phase alternating current to these, an upward thrust in the figure is generated in the pumping passage 15.

Further, on the outer periphery of the coil protection tube 17, a cylindrical casing 22 having inner flanges 20 and 21' is provided at the upper and lower ends, and the inner periphery of the flanges 20 and 21 is connected to the upper and lower portions of the coil protection tube 17. The coil 18 and the yoke 19 are tightly sealed. An outer ceramic tube 24 having an inner flange 23 at the lower end is fitted into the outer circumference of the casing 22, and the inner circumference of the seven flange 23 is connected to the seven flange 1 of the inner ceramic tube f4.
3 and prevents the molten metal 10 from entering into the casing 22, and also protects the coil 18 from heat due to its heat insulating effect.

On the other hand, a funnel-shaped hot water guide pipe 25 is attached to the upper end of the pump. The hot water guide pipe 25 has a structure in which the outer periphery of a ceramic material 26 is covered with a metal frame 27, and a tap water gutter 28 is formed in the cylindrical mouth 25a. In this case, the diameter of the lower end opening 25b of the molten metal guide pipe 25 is approximately the same as the diameter of the inner ceramic tube 14, and there is a circle between the lower end of the molten metal guide pipe 25 and the upper end of the inner ceramic pipe 14. An annular packing 29 is inserted to prevent the molten metal 10 from leaking to the outside. Furthermore, a stepped flange 30 is formed at the lower end of the metal frame 27 , and this flange 30 is bolted to the seventh flange 20 of the casing 22 via a washer 31 .

Note that 32 is a gutter for transporting the molten metal, and 34 is a furnace wall.

The operation of the cylindrical electromagnetic pump having the above configuration will be explained.

First, the lower part of the cylindrical electromagnetic pump is heated with molten metal such as lead or zinc.
Soak in. In this case, the molten metal 10 intrudes into the steel pipe 11 due to the formation of the pores 12; 12.... As a result, thermal energy is supplied from inside the steel pipe 11, and the drop in temperature within the pumping passage 15 is alleviated. Further, the temperature of the molten metal 10 is lower than the melting point of the steel pipe 11, so the molten metal 10 causes the steel pipe 11 to
never melts.

Next, when six-phase alternating current is supplied to the coils 18, 18, . . . , a traveling magnetic field is generated within the pumping passage 15. Focusing on the R phase, for example, the magnetic flux in this case is as shown in FIG.
Since the pump passes through a magnetic path of - inner ceramic tube 14 - passage 15 - copper tube 11, the magnetic path is shorter than conventional pumps due to the lack of refractory lumber. This results in reduced magnetic resistance and improved magnetic efficiency of the pump. Then, due to the magnetic action of this advancing magnetic field, the molten metal 10 rises in the pumping passage 15 and is discharged from the tapping gutter 28 to the gutter 32.

〔Effect of the invention〕

As explained above, according to the present invention, a steel pipe that is not covered with refractory lumber is arranged in a conduit, and molten metal is pumped by electromagnetic induction through a pumping passage formed between the conduit and the steel pipe. Since the water is pumped up, the following effects are achieved.

■ If the lower part of the cylindrical electromagnetic pump is immersed in the molten metal, the molten metal will enter the steel pipe, which will reduce the temperature drop in the pumping passage and completely prevent the assimilation of the molten metal.

■ By using steel pipes that are not covered with refractory lumber, the magnetic path length is shortened, the magnetic resistance is reduced, and the magnetic efficiency of the pump can be increased.

■ By using steel pipes that are not covered with refractory lumber, the structure of the pump is simplified, the product price is lowered, and maintenance work becomes easier.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing 1 and 1 f configurations of a cylindrical electromagnetic pump according to an embodiment of the present invention, and FIGS. 2 and 3 are
They are a vertical cross-sectional view and a cross-sectional view taken along the line 1--2, respectively, showing the structure of a conventional cylindrical electromagnetic pump. 10... Molten metal, 11... Steel pipe, 14.
...Inner ceramic tube (conduit), 15...
・Pumping passage, 18... Coil, 19...
... Yoke (18.19 above is a traveling magnetic field generator). Figure 1 IQ l > Yo 4 11 @ Suga 19゛ Obstruction scissors Figure 3

Claims (1)

[Claims] a fire-resistant conduit; a steel pipe disposed inside the conduit;
A cylindrical electromagnetic pump characterized by comprising a traveling magnetic field generating device that is provided on the outer periphery of the conduit and generates a traveling magnetic field in a pumping passage formed between the conduit and the steel pipe.