JP5113612B2 - Induction electromagnetic pump for molten metal - Google Patents

Description

  The present invention relates to an induction electromagnetic pump for molten metal used for conveying molten metal such as molten aluminum or molten zinc by an induction magnetic field, and particularly in the electromagnetic pump portion, a wall of a molten metal tank or a part thereof is formed. A cylindrical outer duct with one end closed and a hot water duct inlet end disposed in the outer duct form a double duct structure, and a moving magnetic field is generated so as to surround the outer duct The present invention relates to an inductor-exposed type induction metal pump for molten metal provided with an inductor.

  For example, in the field of casting or the like, an induction electromagnetic pump for molten metal is used to convey molten aluminum or the like by applying a thrust to the molten metal by electromagnetic induction. In such an induction electromagnetic pump for molten metal, a coil is fitted into a yoke made of a magnetic material to form an inductor, a moving magnetic field is generated inside the cylindrical duct by the inductor, and thrust is applied to the molten metal. Supply

  Such an induction type electromagnetic pump is described in, for example, Japanese Patent Application Laid-Open No. 2006-341281. In order to generate a moving magnetic field on the outer periphery of the tubular duct through which the molten metal flows, an inductor having a coil fitted to the yoke is arranged, and a magnetic material serving as a magnetic path of the magnetic field generated by the inductor is disposed inside the tubular duct. The core is arranged. The core is covered with a cylindrical protective tube having heat resistance and corrosion resistance. Therefore, the flow path of the molten metal becomes an annular portion formed between the tubular duct and the protective tube, and this kind of electromagnetic pump is called an annular flow path type electromagnetic pump.

FIG. 9 shows a conventional example of an induction electromagnetic pump for an external molten metal in which an inductor is arranged outside the molten metal of the above-described molten metal induction electromagnetic pump. It is a thing.
A hot water outlet is opened on an oblique wall 33 near the bottom of the molten metal tank 31 containing the molten metal 32, and the pump side straight upwards obliquely upward toward the hot water supply direction through a flange-like joint at the hot water outlet. A duct 21 is connected. Further, a hot water supply side duct 21 ′ whose middle portion is bent downward is connected to the pump side duct 21 via joints 25 and 25 ′ such as flange joints. This hot water supply side duct 21 'is pressed against the pump side duct 21 by a spring or the like (not shown), and a heat-resistant gasket inserted between the joints 25 and 25' is used for the joints 25 and 25 '. Sealability is ensured. These ducts 21, 21 ′ are made of a heat-resistant and corrosion-resistant material such as ceramic, and a heater 29 is wound on the outside for heat insulation so that the temperature is higher than the melting point of the molten metal 32. It has become.

  An inductor 34 having a coil fitted to a magnetic yoke is disposed around the pump-side duct 21 on the front side. A core 22 made of a magnetic cylinder is disposed in the pump-side duct 21 so that the central axes thereof coincide with each other. The core 22 is housed in a cylindrical protective tube 23 whose both ends are closed, and is not in direct contact with the molten metal in the pump side duct 21. The protective tube 23 is made of a heat-resistant and corrosion-resistant material such as ceramic, and a ceramic fiber such as alumina or magnesia or a filler 28 such as ceramic powder is filled around the core 22 therein as a cushioning material. Has been.

  A flange 26 is extended around one end of the protective tube 23 near the hot water supply side duct 21 ', and a portion near the outer periphery of the flange 26 connects the pump side duct 21 and the hot water supply side duct 21'; 25 '. Thereby, the core 22 in the protective tube 23 is held so as to be positioned at the center of the pump side duct 21. The pump side duct 21 and the hot water supply side duct 21 ′ are heated by a heater 29 made of a heat retaining micro heater or the like provided on the outer periphery thereof to prevent solidification of the molten metal. A plurality of arc-shaped passage holes 27 serving as passages for the molten metal 32 are provided on the inner peripheral side of the portion of the flange 26 sandwiched between the joints 25 and 25 ′.

  FIG. 10 is an example of a so-called immersion type induction electromagnetic pump for annular molten metal. In this type of induction molten electromagnetic pump for molten metal, the inductor 34 is housed in a protective case 37 made of a material having heat resistance and corrosion resistance, such as ceramic, and almost all of the pump portion is molten metal in a molten metal tank. 32. There is a hole for introducing molten metal in the center of the lower end of the protective case 37, and the lower end of the pump side duct 21 is joined to this portion. The molten metal 32 is pumped into the pump side duct 21 from the hole at the lower end of the pump side duct 21. The protective tube 23 is suspended from the connecting portion between the pump side duct 21 and the hot water supply side duct 21 ′ by the flange 41 to the height of the inductor 34. The connection is closed by a longitudinal lid 42 and a lateral lid 42 '. The core 22 is suspended from the vertical lid 42 to the height of the inductor 34 by a rod 43. In addition, the structure of the electromagnetic pump itself and the connection of the ducts 21 and 21 'are basically the same as those shown in FIG. 9, and the same portions are denoted by the same reference numerals. Since the details overlap, description is omitted.

These induction electromagnetic pumps for molten metal have problems specific to both types.
First, in the so-called external type electromagnetic pump in which the inductor 34 described with reference to FIG. The flanges 25 and 25 'between the pump side duct 21 and the hot water supply side duct 21' are sandwiched and connected. For this reason, the connection structure between the pump side duct 21 and the hot water supply side duct 21 ′ and the holding structure of the protective tube 23 are complicated and unstable. Therefore, vibration becomes a problem during operation, and it takes time and labor to disassemble the pump side duct 21, the hot water supply side duct 21 'and the protective tube 23 for maintenance, and then reassemble them.

Further, in the so-called immersion electromagnetic pump in which the inductor 34 described with reference to FIG. 10 is housed in the protective case 37 and disposed in the molten metal 32, the pump-side duct 21 and the inductor 34 disposed so as to surround it are provided. It is stored in a protective case 37 made of ceramic. This inevitably increases the size of the pump. Moreover, since the inductor 34 is accommodated in the protective case 37 immersed in the molten metal 32, the inductor 34 cannot dissipate heat to the outside, and heat accumulates, and the inductor 34 becomes high temperature. For this reason, it is necessary to use a special heat resistant coil for the inductor 34. In addition, since the pump-side duct 21 and the protective case 37 are joined together in the molten metal 32, a special joint technique using heat-resistant and corrosion-resistant packing is required. For these reasons, there are many factors that increase costs, and there are difficult problems in terms of manufacturing and maintenance.
JP 2006-341281 A

  In view of the problems in the conventional induction electromagnetic pump for molten metal, the present invention combines the advantages of a submersible molten metal electromagnetic pump with a so-called external molten metal electromagnetic pump so that the heat of the molten metal does not reach the inductor directly. Another object of the present invention is to provide an external electromagnetic pump that facilitates maintenance such as disassembly and assembly of ducts.

  In the present invention, in order to achieve the above-described object, in the electromagnetic pump portion, a cylindrical outer duct 3 forming one part or all of the wall of the molten metal tank 11 and having one end closed, and the outer duct A double duct structure was formed by the end of the hot water supply duct 1 on the inlet 5 side, and an inductor 14 for generating a moving magnetic field was provided outside the outer duct 3 so as to surround it. This allows the inductor 14 to radiate heat to the outside, and eliminates the need for a close connection between the outer duct 3 and the hot water supply duct 1, thereby simplifying the structure and maintaining maintenance such as disassembly and assembly of the ducts. Made it easier.

  The induction electromagnetic pump for molten metal according to the present invention is basically provided with an inductor 14 that generates a moving magnetic field outside the cylindrical ducts 1 and 3 through which molten metal passes, as in the case of a general molten metal electromagnetic pump. A core 2 made of a magnetic material that forms a magnetic path of a moving magnetic field generated by the inductor 14 is disposed in a duct 3.

In the present invention, in such a molten metal electromagnetic pump, a cylindrical outer duct 3 that forms a small chamber in a part of the wall of the molten metal tank 11 that accommodates the molten metal 12 is closed, and the outer duct. 3 is provided with a cylindrical hot water supply duct 1 in which an end on the inlet 5 side is disposed, and is provided outside the outer duct 3 so as to surround the outer hot water duct 3, and between the outer duct 3 and the hot water supply duct 1. has the inductor 14 for generating a moving magnetic field, and a core 2 which is built in an end portion of the inlet 5 side of the hot-water supply duct 1 so as to correspond to the position of the inductor 14, the inductor 14, the outer A moving magnetic field is generated in a direction in which the molten metal in the duct 3 is guided into the inlet 5 of the hot water supply duct 1 .

  In this molten metal electromagnetic pump, the molten metal 12 passes between the outer duct 3 and the hot water supply duct 1 from the molten metal tank 11 side, and is reversed and guided in the direction from the inlet 5 of the hot water supply duct 1 therein. Molten metal is conveyed from the molten metal tank 11 side to the target location through the hot water supply duct 1 by the pressure of the molten metal between the outer duct 3 and the hot water supply duct 1 that generates a moving magnetic field in the inductor 14.

In such an induction electromagnetic pump for molten metal, the inductor 14 for generating a moving magnetic field is provided outside the outer duct 3 forming a small chamber of a part of the wall of the molten metal tank 11. Therefore, it is not necessary to store the heat in the case exposed to the high temperature of the molten metal, and the heat of the inductor 14 can be released to the outside. Moreover, it is only necessary to arrange the end of the hot water supply duct 1 on the inlet 5 side in the outer duct 3, and it is not necessary to join them, so that a close connection between the outer duct and the hot water supply duct becomes unnecessary. Can be easily disassembled and assembled.

  This induction electromagnetic pump for molten metal can be used for various applications in addition to the field of casting such as casting of molten metal into the mold a, and some morphological changes on the outlet 10 side of the hot water supply duct 1. I can do it. For example, molten metal plating can be performed by passing a plated product b such as a wire through molten metal ejected from the outlet 10 of the hot water supply duct 1. In this case, a reflux path 18 for returning the molten metal discharged from the outlet 10 of the hot water supply duct 1 to the molten metal tank 11 may be provided. Further, if the molten metal is directly discharged from the outlet 10 of the hot water supply duct 1 into the molten metal 12 in the molten metal tank 11, it is used as a stirring pump for stirring the molten metal 12 in the molten metal tank 11. Is also possible.

  As described above, in the molten metal induction electromagnetic pump according to the present invention, the heat of the inductor 14 can be radiated to the outside, so that no special heat resistant coil is required for the inductor 14. Moreover, it is not necessary to connect the outer duct and the hot water supply duct closely, and the disassembly and assembly thereof are facilitated, so that the induction electromagnetic pump for molten metal can be easily assembled, maintained, and managed. For these reasons, it is possible to achieve cost reduction including downsizing, maintenance and management of the induction electromagnetic pump for molten metal.

In the present invention, the end portion on the inlet 5 side of the hot water supply duct 1 is disposed in the cylindrical outer duct 3 with one end closed to form part or all of the wall of the molten metal tank 11, The portion has a double duct structure, and the inductor 14 is provided on the outer side, thereby enabling heat radiation to the outside of the inductor 14 and simplifying the structure to achieve the object.
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

1 and 2 show an embodiment of an induction electromagnetic pump for external molten metal according to the present invention, FIG. 1 is an overall sectional view thereof, and FIG. 2 is an enlarged sectional view of a main portion of a portion of an outer duct 3 thereof. .
A tubular outer duct 3 is provided near the bottom of the molten metal tank 11 containing the molten metal 12 so as to form a part of the wall of the molten metal tank 11. This outer duct 3 is a cup-shaped thing having heat resistance and corrosion resistance made of ceramics or the like with one end closed, and is embedded in the side wall near the bottom of the molten metal tank 11 from the inside and protrudes laterally from the side wall. Are provided. The molten metal tank 11 and the outer duct 3 are sealed tightly and can be removed from the side wall of the molten metal tank 11 when the molten metal 12 is removed from the molten metal tank 11.

An end of the hot water supply duct 1 on the inlet 5 side is inserted and arranged in the outer duct 3, and the outer duct 3 and the end of the hot water supply duct 1 on the inlet 5 side are double tube structure in this portion. Is forming. A circular tubular core 2 made of a magnetic material is embedded in the end of the hot water supply duct 1 on the inlet 5 side.
The hot water supply duct 1 is made of a heat-resistant and corrosion-resistant material such as ceramic, and rises in the molten metal tank 11 through the molten metal 12 in the molten metal tank 11. It extends through the through-hole 8 of the lid 7 and above it. A portion near the upper end of the hot water supply duct 1 extending above the lid 7 bends in a horizontal shape, continues from an ascending slope to a descending slope, and reaches an outlet 10. The highest portion of the bottom portion of the hot water supply duct 1 that changes from an ascending gradient to a descending gradient is an overflow weir 6 that causes the molten metal to overflow as described later.

A heater 9 such as a micro heater is wound around the outer periphery of the outer duct 3, and the outer side thereof is covered with a heat insulating material 4, so that the outer duct 3 is thermally insulated from the outside.
Further, an inductor 14 is provided outside the heat insulating material 4 so as to surround the outer duct 3. As shown in FIG. 2, the inductor 14 is a portion in which a coil 16 is fitted to a yoke 15 and is a portion that hits a stator of an armature such as a motor or a generator. The core 2 embedded at the end of the hot water supply duct 1 on the inlet 5 side is provided so as to correspond to the position of the inductor 14.

  In such a molten metal electromagnetic pump, the inductor 14 generates a moving magnetic field from left to right in FIGS. 1 and 2. Thus, between the outer duct 3 and the end of the hot water supply duct 1 on the inlet 5 side along the magnetic path formed between the inductor 14 and the core 2 at the end of the hot water supply duct 1 on the inlet 5 side. A moving magnetic field is formed. The molten metal 12 between the outer duct 3 and the end of the hot water supply duct 1 on the inlet 5 side is induced by this moving magnetic field and receives thrust from the left to the right in FIGS. It reverses at the closed end and flows into the hot water supply duct 1 from the inlet 5 of the hot water supply duct 1. The molten metal that has flowed into the hot water supply duct 1 rises through the hot water supply duct 1 by being pressed by the pressure of the molten metal 12 between the outer duct 3 and the end of the hot water supply duct 1 on the inlet 5 side. .

  FIG. 1 shows a state in which the level of the molten metal is pushed up by the electromagnetic pump to a position lower than the overflow weir 6 at the uppermost end of the hot water supply duct 1 by h0. When the level of the molten metal is maintained at this height by maintaining the output of the inductor 14, the molten metal is not discharged from the outlet 10 of the hot water supply duct 1. When the output of the inductor 14 is increased from this state and the liquid level of the molten metal is pushed up to a position higher than the overflow weir 6, the molten metal overflows the overflow weir 6 and flows from the outlet 10 of the hot water supply duct 1 to the molten metal. Is discharged. After that, when the output of the inductor 14 is restored, the liquid level of the molten metal is returned to a position lower than the overflow weir 6, and this state is maintained, the discharge of the molten metal from the outlet 10 of the hot water supply duct 1 is stopped again. . In this way, discharge of molten metal from the outlet 10 of the hot water supply duct 1 and its stop are controlled. The destination for supplying the molten metal from the outlet 10 of the hot water supply duct 1 is generally, for example, a casting mold or a plating bath for performing molten metal plating.

  FIG. 3 is a longitudinal side view showing another embodiment in which the configuration of the embodiment of FIGS. 1 and 2 is slightly changed. In this embodiment, the outer duct 3 is provided obliquely at the bottom of the molten metal tank 11, and accordingly, the inductor 14 disposed on the outer side and the end portion on the inlet 5 side of the inner hot water supply duct 1 disposed therein. Are provided obliquely at the same angle as the outer duct 3. The portion of the hot water supply duct 1 reaching the overflow weir 6 is provided straight so as to cross the molten metal tank 11 diagonally. Other configurations are basically the same as those of the embodiment described above with reference to FIGS. 1 and 2, and the same portions are denoted by the same reference numerals. The description of these parts is redundant and will be omitted.

  FIG. 4 is a longitudinal side view showing another embodiment in which the configuration of the embodiment of FIGS. 1 and 2 is slightly changed. In this embodiment, the outer duct 3 is provided vertically at the bottom of the molten metal tank 11, and accordingly, the inductor 14 disposed on the outer side and the end of the inner hot water duct 1 disposed on the inlet 5 side on the inner side. Are provided vertically in the same manner as the outer duct 3. Other configurations are basically the same as those of the embodiment described above with reference to FIGS. 1 and 2, and the same portions are denoted by the same reference numerals. The description of these parts is redundant and will be omitted. FIG. 4 shows a casting mold a as an example of a destination to which the molten metal is supplied from the outlet 10 of the hot water supply duct 1.

FIG. 5 is a longitudinal side view of the portion in the embodiment of FIGS. 1 and 4 in which the configuration of the end portion on the outlet 10 side of the hot water supply duct 1 is changed.
FIG. 5A shows that the outlet 10 side of the hot water supply duct 1 stands straight without bending, and the outlet 10 is directly connected to the pouring port facing the lower side of the mold a. This is an example in which molten metal is directly cast into a cavity therein through a casting port of a mold a.

  FIG. 5 (b) shows that the outlet 10 side of the hot water supply duct 1 is straight without bending, molten metal is ejected from the outlet 10, and the molten metal is plated through the plated material b such as a wire to the molten metal jet. It is an example to apply. The molten metal ejected from the outlet 10 of the hot water supply duct 1 and flowed to the outside returns to the molten metal 12 in the molten metal tank through the annular flow path 18 provided outside the hot water supply duct 1. The upper end of the annular flow path 18 is widened in a funnel shape so that the molten metal flowing out from the outlet 10 of the hot water supply duct 1 can be easily received.

  FIG. 6 is similar to the embodiment described above with reference to FIG. 5B, and stands straight without bending the outlet 10 side of the hot water supply duct 1, and the molten metal is ejected from the outlet 10. This is an example in which molten metal plating is performed through a plated material b such as a wire. In this example, the outer duct 3 with the opening facing upward also serves as the molten metal tank 11, and the molten metal ejected from the outlet 10 of the hot water supply duct 1 and flowed to the outside is provided outside the hot water supply duct 1. A circulation path is formed so as to flow directly into the outer duct 3 and return to the molten metal 12 in the outer duct 3. The upper end of the outer duct 3 is widened in a funnel shape so that the molten metal flowing out from the outlet 10 of the hot water supply duct 1 is easily received.

  In FIG. 7, the outlet 10 of the hot water supply duct 1 is not led out of the molten metal tank 11 but is disposed in the molten metal 12 in the molten metal tank 11. Thereby, the molten metal ejected from the outlet 10 of the hot water supply duct 1 is discharged into the molten metal 12 in the molten metal tank 11, and the molten metal 12 in the molten metal tank 11 is circulated and stirred. . In this embodiment, several spacers 13 having protrusions on the outer periphery are provided at regular angular intervals so that the hot water duct 1 does not move due to the reaction force of the molten metal ejected from the outlet 10 of the hot water duct 1. The protrusion is fitted and fixed to the spacer stopper 17 provided in the outer duct 3.

  FIG. 8 is an exploded perspective view of the hot water supply duct 1 and the outer duct 3. When the hot water supply duct 1 is fitted into the outer duct 3, the protrusion of the spacer 13 of the hot water supply duct 1 is fitted into the spacer stopper 17 provided on the outer duct 3 and fixed. In the illustrated example, three spacers 13 are provided on the outer periphery of the hot water supply duct 1 at intervals of 120 °. The number of the spacers 13 is not particularly limited. In FIG. 7, the hot water supply duct 1, the outer duct, and the inductor 14 are provided sideways, but may be provided obliquely or upward.

  The present invention provides an induction electromagnetic pump for molten metal that does not require a special heat-resistant coil for the inductor 14, facilitates disassembly and assembly of the duct, and achieves cost reduction including downsizing, maintenance, and management. I can do it. Such an induction electromagnetic pump for molten metal can be used not only in the field of casting such as pouring molten metal into a mold but also in the field of molten metal plating.

It is a vertical side view which shows one Example of the induction type electromagnetic pump for external type molten metals by this invention. It is a principal part expansion vertical side view of one Example of the induction | guidance | derivation electromagnetic pump for external type molten metals of FIG. It is a vertical side view which shows the other Example of the induction type electromagnetic pump for external type molten metal by this invention. It is a vertical side view which shows the other Example of the induction type electromagnetic pump for external type molten metal by this invention. It is a partial vertical side view which shows the example of the embodiment of the outflow exit vicinity of the hot water supply duct of the induction | guidance | derivation electromagnetic pump for external type molten metals by this invention. It is a vertical side view which shows the other Example of the induction type electromagnetic pump for external type molten metal by this invention. It is a vertical side view which shows the other Example of the induction type electromagnetic pump for external type molten metal by this invention. It is a perspective view of the state which decomposed | disassembled the outer side duct and hot water supply duct of the induction | guidance | derivation electromagnetic pump for external type molten metals of FIG. It is sectional drawing which shows the prior art example of the induction electromagnetic pump for molten metals. It is sectional drawing which shows the other conventional example of the induction | guidance | derivation electromagnetic pump for molten metals.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply duct 2 Core 3 Outer duct 5 Hot water supply duct inlet 10 Hot water supply outlet 11 Molten metal tank 12 Molten metal 14 Inductor 18 Ring flow path

Claims (4)

A cylindrical hot-water supply duct (1) for passing molten metal, an outer duct (3) provided outside the hot-water supply duct (1), and an inductor (14 for generating a moving magnetic field outside the outer duct (3) ) And a core (2) made of a magnetic material that forms a magnetic path of a moving magnetic field generated in the inductor (14) in the hot water supply duct (1). (12) A cylindrical outer duct (3) with one end closed forming a small chamber of a wall of the molten metal tank (11) that houses (12), and an inlet ( 5) Cylindrical hot water supply duct (1) in which an end portion on the side is arranged, and provided outside the outer duct (3) so as to surround the outer hot water duct (3), the hot water supply duct (1), And an inductor (14) for generating a moving magnetic field between the inductor (14) and the position of the inductor (14). And a response to the inlet (5) side core incorporated in the end portion of the hot water supply duct (1) (2), said inductor (14), the molten metal of the outer duct (3) hot water An induction electromagnetic pump for molten metal with an external inductor, wherein a moving magnetic field is generated in a direction induced in an inlet (5) of a duct (1) . In the inductor (14), the molten metal (12) passes from the molten metal tank (11) between the outer duct (3) and the hot water supply duct (1), and is reversed to enter the inlet (5 of the hot water supply duct (1)). The induction electromagnetic pump for an externally mounted inductor for molten metal according to claim 1, wherein a moving magnetic field is generated in a direction induced therein. A reflux path (18) is provided for circulating the molten metal discharged from the outlet (10) of the hot water supply duct (1) between the outer duct (3) and the hot water supply duct (1). Item 3. The induction electromagnetic pump for molten metal placed on an inductor according to item 1 or 2. 3. The inductor external placement type according to claim 1, wherein the molten metal is discharged into the molten metal (12) in the molten metal tank (11) from the outlet (10) of the hot water supply duct (1). Induction electromagnetic pump for molten metal.

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