JPS5932209Y2 - Corrosion-resistant core structure of electromagnetic pump for molten metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic pump for molten metal used to transport and flow molten metal, and particularly relates to a core structure provided within a duct thereof.

As is known, there are two types of electromagnetic pumps of this type: an annular flow path type linear induction electromagnetic pump and a rectangular flow path type linear induction electromagnetic pump, and the present invention is directed to the core structure of the former. , which is known as the electromagnetic pump, is constructed as shown in FIG.

In other words, there is a duct A that serves as a flow path for a conductive fluid that is molten metal, and a stator C that is disposed around its outer periphery via a heat insulating material.
The stator C includes a plurality of comb-shaped laminated cores d and an induction coil f fitted in each slot e of the core d.
The duct a is formed into a cylindrical shape, and a metal core protection pipe containing an iron core g coaxially therein is housed and supported via a spacer i.

In order to transfer the conductive fluid, the stator C is excited by a multiphase alternating current to generate a moving magnetic field in the axial direction of the duct a, and the conductive fluid cuts the magnetic field to induce the fluid. A current is generated, and the interaction between this current and the moving magnetic field causes the fluid to be transported in the direction of arrow A shown in the figure.

When using such a conventional electromagnetic pump to transfer molten metal such as liquid sodium as described above, duct a
Existing metal materials may be used for the duct or metal core protection pipe, but if this is a highly corrosive conductive fluid such as liquid zinc or liquid aluminum, the duct or the same protection pipe may be used. It is corroded and cannot be used.

In view of this, the present invention solves the problem of corrosion by protecting the core such as an iron core with a corrosion-resistant ceramic such as silicon nitride or silicon carbide, and improves the productivity of the core protection structure. It is intended not only to eliminate the risk of damage, but also to provide a solution to the problems that would arise due to the difference in thermal expansion between the ceramic to be protected and the core.

The present invention will be described in detail with reference to the embodiment shown in FIG.
In FIG. 1, the storage body 1 has a core head portion 2 and a core protection tube 3 prepared as separate members, and a small diameter portion 1 protruding from a tapered large diameter portion 2' of the head portion 2 is attached to the core protection tube. 3, and both 2 and 3 are fixed with a corrosion-resistant bonding agent 4 made of monolithic refractories, ceramics, etc. In this case, the tapered large diameter part and the end port 3' are appropriately spaced apart from each other, and a sufficient amount of corrosion-resistant bonding agent 4 is placed between them.

On the other hand, in the core storage body 1 shown in FIG. 4, the core head portion 2 and the core protection tube portion 3 are integrally formed with the same diameter.
In either case, a plurality of spacers 5 made of corrosion-resistant ceramic are bonded to the outer circumferential surface of the core head portion 2 using the same corrosion-resistant bonding agent 6 as described above.

Here, the above-mentioned corrosion-resistant ceramic is selected depending on the type of molten metal to be transported and flowed. BN, Al2O3 as an oxide, and MgO-stabilized zrO2 are conceivable, and in this case, considering that they can withstand thermal shock, carbides and nitrides are preferable, and therefore 5i
C1Si3N4 is the best, and Si3N4 in particular has the advantage that it does not get wet with the molten metal and drains easily.

Furthermore, in the embodiment shown in FIG. 3, a protrusion 5' is provided on the base side of the spacer 50, which is fitted into the groove 7 of the core head 2, and then bonded with the above-mentioned corrosion-resistant bonding agent 6. In this way, we are trying to strengthen it.

Next, in the present invention, a core 8 made of an iron core or the like is housed through the opening 3'' in the core protection tube part 3 of the core storage body 1 constructed as described above, and a core head 9 made of corrosion-resistant ceramic is separately prepared. , the small diameter part protruding from the tapered large diameter part 9' is fitted into the open logo', and both 3 and 9 are fixed with the corrosion-resistant adhesive 10 as described above. and the core head 9 at an appropriate distance,
It is desirable that a sufficient amount of corrosion-resistant adhesive 10 is placed between them, and a plurality of spacers 5' are provided on the outer peripheral surface of this core head 9 as described above.
It is fixed by this.

In the present invention, the dimensions of the core 8 are further made shorter than the distance between the small diameter part of the core head part 2 and the small diameter part of the core head 9, as shown in FIG. Since a gap 12 is formed on the end surface side of the core 8, a cushioning material 13 made of glass fiber or the like is housed in this gap 12 in the embodiment shown in FIG.

In the present invention, as described above, the core 8 is covered with the core storage body 1 made of corrosion-resistant ceramic, the core head 9, and the corrosion-resistant bonding agent 4, 10, and the spacer 5.5 is surrounded by the corrosion-resistant bonding agent 6,
11, the core 8 is completely prevented from coming into contact with the molten metal flowing inside the duct a, which not only completely eliminates the problem of corrosion, but also allows several components to be prepared in advance. Since these are bonded together using a corrosion-resistant adhesive, they can be manufactured using relatively small-scale equipment, and since a gap 12 is formed on the end surface side of the core 8, the thermal expansion of the core 8 protects the core. A highly reliable core structure can be provided without damaging the ceramic forming the member.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an example of a conventional electromagnetic pump for molten metal; FIG. 4 is a longitudinal sectional front view of the same embodiment, FIG. 4 is a longitudinal sectional front view of another embodiment of the same type, and FIG. 5 is a partial longitudinal sectional front view of another embodiment showing the core portion. 1... Core storage body, 2... Core head section, 3...
Core protection tube part, 4, 6, 10, 11... Corrosion-resistant bonding agent, 5.5'... Spacer, 8... Core, 9... Core head, 12... Gap, 13... Cushion material.

Claims (4)

[Scope of utility model registration request] (1) The core storage body includes a core head portion at one end and a core protection tube portion made of corrosion-resistant ceramic.
A plurality of spacers made of corrosion-resistant ceramics are fixed to the outer peripheral surface of the core head portion using a corrosion-resistant bonding agent such as a monolithic refractory or ceramic, and a core such as an iron core is stored in the core protection tube portion of the core storage body, Further, a core head at the other end fitted into the opening of the core protection tube section is formed of a corrosion-resistant ceramic, and a plurality of spacers made of a corrosion-resistant ceramic are fixed to the outer peripheral surface of this core head with the above-mentioned corrosion-resistant bonding agent. A corrosion-resistant core structure for an electromagnetic pump for molten metal, which is bonded to a core protection tube part using the same corrosion-resistant bonding agent as above, and in which a gap is formed on the end face side of the core in the core protection tube housing the core. (2) The electromagnetic pump for molten metal according to claim 1, wherein the core storage body is formed by fixing the core head portion and the core protection tube portion into which the rotating portion is fitted with a corrosion-resistant bonding agent. Corrosion resistant core construction. (3) A corrosion-resistant core structure for an electromagnetic pump for molten metal according to claim 1, wherein the core storage body is formed integrally with a core head portion and a core protection tube. (4) A corrosion-resistant core structure for an electromagnetic pump for molten metal according to claim 1, wherein a cushioning material such as glass fiber is housed in the gap.