JPH0538126A - Flux convergence-type strong magnetic field solenoid pump - Google Patents

Abstract

PURPOSE:To obtain a powerful flux convergence-type solenoid pump with a simple structure, good efficiency and high delivery amount by constituting a conductor disc through increasing the thickness of the central part of the disc so that the radial section of the disc is approximately formed into a T-shape. CONSTITUTION:In a conductor disc 2, the thickness of the periphery 10 of a central hole is made greatly thicker than other parts so that the radial section of the disc is approximately formed into a T-shape, and a spiral exciting coil 1 is combined with the periphery into a unit element. Then, when the spiral exciting coil 1 is cascade-connected appropriately and three-phase AC voltage is applied to both sides of the coil, the travelling magnetic field of a uniformly distributed high flux density is generated in a gap 9 and a strong axial thrust is generated by the interaction with an eddy current generated in a molten metal in the gap 9 to act as a solenoid pump for rolling the molten metal. As a result, a leakage flux decreases while an effective flux in the gap of a double-structure pipe increases, and a thrust acting on the molten metal further increases so that rolling characteristics of the solenoid pump are improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump for transferring a molten metal in a pipe by electromagnetically applying a thrust from the periphery of the pipe, and more particularly, to a metal plate between coil layers by a multi-phase AC exciting coil. A magnetic flux convergence type strong magnetic field electromagnetic pump capable of strongly transferring molten metal by a traveling magnetic field formed by converging in the pipe both the magnetic flux induced by the generated eddy currents and the magnetic flux induced in the magnetic frame around the coil, especially metal The eddy current concentrated in the central portion of the plate is dispersed in the axial direction to prevent local overheating, and the applied voltage, effective magnetic flux and propulsion output can be increased.

[0002]

2. Description of the Related Art Conventionally, regarding the transportation of high temperature molten metal,
The development of a large-capacity electromagnetic induction pump suitable for use as a pump for circulating molten sodium as a coolant for fast breeder reactors, which has been extremely focused in each country and is attracting attention as an energy source for the next generation, It is an urgent research subject for the practical application of fast breeder reactors.
The research is being promoted as a national enterprise.

However, the conventional linear induction type electromagnetic pump is difficult to use as a large capacity electromagnetic pump because the magnetic flux density of the traveling magnetic field in the transfer pipe is low and the discharge amount is insufficient. Therefore, the development of a new type of electromagnetic pump has been desired internationally.

That is, as a pump used for transporting high-temperature molten metal flowing out from a melting furnace, and particularly for circulating high-temperature molten sodium as a coolant for a fast breeder reactor, an ordinary rotary vane type mechanical pump is used for a long period of continuous use. In this case, there is a slight problem regarding safety, and at present, the linear induction type electromagnetic pump is said to be the most suitable, and the linear induction type electromagnetic pump by various methods was developed, and the small capacity electromagnetic pump has already been put into practical use. Has been done. However, in the conventional linear induction type electromagnetic pump, the magnetic flux density of the traveling magnetic field in the transfer pipe is slightly low, and it is about 3000 gas at the maximum.
It was difficult to manufacture a large-capacity electromagnetic pump because sufficient thrust could not be obtained and the discharge amount was insufficient.

[0005]

Therefore, the present inventor previously proposed a "flux-converging type electromagnetic pump" according to Japanese Patent Application No. 2-56331, and melts it as compared with a conventional electromagnetic pump. We have developed an electromagnetic pump that dramatically improves the characteristics of metal transportation, but when this electromagnetic pump is also used for large capacity, there are some problems in the characteristics, and that problem can be solved to further improve the characteristics. Had to do.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to further improve the characteristics of the previously developed magnetic flux converging type electromagnetic pump to provide a sufficiently large capacity electromagnetic pump. Especially.

Another object of the present invention is to construct a powerful electromagnetic pump for transporting high temperature molten metal having a simple structure, high efficiency and large discharge amount, for example, molten metal taken out from a melting furnace, especially in a fast breeder furnace. An object is to provide a large-capacity induction type electromagnetic pump suitable for transporting and circulating a large amount of sodium for heat exchange.

Still another object of the present invention is that an electromagnetic pump conventionally developed and used has a low magnetic flux density of an induced traveling magnetic field, and therefore, a sufficient thrust and a sufficient discharge amount cannot be obtained. To improve the magnetic flux converging type electromagnetic pump that has been dramatically improved from being used only as an electromagnetic pump with a relatively small capacity, and to provide a new large-scale electromagnetic pump with high efficiency and large capacity that takes advantage of its features. is there.

According to the present invention, a spiral excitation coil and conductor discs having slits in the radial direction are alternately laminated, and the periphery thereof is surrounded by a magnetic frame such as a laminated core, and the inside of the center hole of the conductor disc is surrounded. Regarding a magnetic flux converging type electromagnetic pump with a non-magnetic material pipe arranged in communication with each other, the peripheral portion of the central hole of the conductor disk is made thicker and its radial cross section is T-shaped, and the central hole and this are communicated. The diameter of the non-magnetic material pipe is increased and another non-magnetic material pipe with a smaller diameter is placed inside the pipe to form a double structure pipe, and the molten metal to be transferred into the gap of the double pipe structure. While guiding
A member for converging the magnetic flux of the traveling magnetic field induced inside the inner pipe at a high density, for example, a rod-shaped magnetic material, or
A spiral coil located around the outer pipe, a conductor disk and a magnetic body having a T-shaped radial cross-section with a thickened central portion, and a spiral coil and a magnetic frame body, etc., which are respectively made to correspond to them. That is, it is possible to uniformly concentrate the magnetic flux density by preventing local concentration of the magnetic flux in the gap of the double structure pipe.

That is, the magnetic flux converging type strong magnetic field electromagnetic pump of the present invention has a plurality of layers of exciting coils which are coaxially engaged with each other and wound with the same polarity, and are interposed between the layers of the exciting coil so as to have an outer peripheral edge. A plurality of layers of conductor discs each having a communicating radial slit and sharing a slit and a hole communicating with each other coaxially at the center, and enclosing the excitation coil and the conductor disc in a vertical cross-section outer periphery. A substantially U-shaped magnetic frame forming a magnetic closed circuit through the hole constitutes a unit magnetic flux generating element, and a plurality of magnetic flux generating elements are closely arranged in the axial direction of the hole. The eddy current generated in the conductor disk is concentrated around the hole along the slit in accordance with the multi-phase AC energization, and progresses in the axial direction in the hole sequentially communicated. A magnetic flux is generated in the magnetic closed circuit formed by the magnetic frame, and the traveling magnetic flux in the hole is superposed in phase with the traveling magnetic flux, and the non-magnetic material pipe that penetrates the inside of the sequentially communicating holes is inserted. A magnetic flux concentrating member forming a part of the magnetic closed circuit is sequentially arranged coaxially and the traveling magnetic fluxes superposed in phase with each other are converged, thereby thrusting the molten metal in the non-magnetic material pipe in the axial direction. In the magnetic flux converging type electromagnetic pump, the thickness of the central portion of the conductor disk is increased so that the radial cross section has a substantially T-shape.

[0011]

Therefore, according to the present invention, a large number of conductor discs provided with slits and spiral coils are alternately laminated and surrounded by a magnetic frame, and the conductor discs are concentrated by concentrating eddy currents due to polyphase alternating current. A magnetic flux converging electromagnetic system according to the present inventors' previous proposal, in which a traveling magnetic field with a high magnetic flux density is generated in the center hole, and the characteristics are dramatically improved as compared with the conventional annual induction type electromagnetic pump. By thickening the central part of the conductor disk in the pump, the concentrated eddy currents are dispersed in the axial direction, so local overheating is prevented and the applied voltage, effective magnetic flux, and propulsion output are increased to promote the molten metal transfer. Efficiency and characteristics can be further improved.

That is, according to the present invention, by making the radial cross section of the portion of the conductor disk for generating eddy currents, which is in contact with the pipe for high temperature molten metal transportation, T-shaped, the eddy currents concentrated in that portion cause It can prevent local overheating, reduce losses, increase the applied voltage to allow an increase in propulsion power, and reduce the leakage flux to reduce the effective flux in the gap of the double pipe, i.e., The radial magnetic flux increases and the axial thrust acting on the molten metal increases. As a result, it is used for high temperature molten metal transfer, magnetic casting, fast breeder reactor coolant sodium circulation, magnetic accelerator etc. It is possible to realize a large-sized electromagnetic pump suitable for.

The effect of the present invention is not limited to the comparatively small capacity in which the magnetic flux concentration member in the molten metal transfer pipe is a rod-shaped magnetic body, but the magnetic flux concentration member which actively acts is used. The same thing can be obtained for a large capacity.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

First, FIG. 1 shows a side sectional view of a "flux-converging electromagnetic pump" which has been proposed by the present inventor and which is an object of the improvement according to the present invention, and FIG. 2 shows a vertical sectional view thereof. Will be explained.

FIG. 1 shows a spiral excitation coil 1 and a conductor disc 2.
2 shows a side cross section at a right angle to the axis at the boundary with, and FIG. 2 shows a vertical cross section including the axis. In the illustrated configuration, the exciting coil 1 spirally wound as shown in FIG. As shown in FIG. 2, a large number of eddy current generating conductor discs 2 provided with radial slits 4 extending from the central hole 3 to the outer periphery are alternately and closely laminated, or as shown in FIG. Unit elements of each group sandwiching 2 by a pair of exciting coils 1 are arranged in a spaced manner, and the outer periphery thereof is surrounded by a U-shaped magnetic frame 6 made of a laminated iron plate or the like in an axially symmetrical manner in the radial direction. A pipe 7 made of a non-magnetic metal is arranged so as to communicate with the central hole 3, and a magnetic core 8 of a rod-shaped magnetic body made of a laminated core or the like is provided in the pipe 7, and a gap 9 between the pipe 7 and the rod-shaped magnetic core 8 is provided. It is designed to guide molten metal.

In the above-mentioned structure, when the spiral excitation coils 1 forming each unit element are properly connected in sequence to the same polarity and a three-phase AC voltage is applied, for example, a three-phase AC voltage is generated and concentrated on the central portion of the conductor disk 2. An axial traveling magnetic field induced by the eddy current is generated in the gap 9, and as a result, an eddy current flows in the molten metal in the gap 9 to generate a thrust, which acts on the molten metal and is axially transferred. Acts as an electromagnetic pump. FIG. 5 is a partially cutaway external view of a magnetic flux convergence type electromagnetic pump of the related art having such a configuration.

The present invention further improves the characteristics by changing the shape of the conductor disc, particularly the shape of the center portion of the magnetic flux converging type electromagnetic pump having the above-mentioned structure, and the double pipe of the non-magnetic material pipe for molten metal transportation. With the structure, each of the unit elements arranged inside the inner pipe along the outer circumference of the outer pipe has the same corresponding unit element, and the heights evenly distributed in the gap between the inner and outer pipes. It is designed to generate a traveling magnetic field of magnetic flux density.

FIG. 6 shows a front view and a sectional view of the conductor disk 2 in the first configuration example of the magnetic flux convergence type strong magnetic field electromagnetic pump of the present invention. The conductor disc 2 shown in the figure is configured such that the thickness of the peripheral portion 10 of the center hole 3 is significantly thicker than the other portions, and the radial cross-sectional shape is substantially T-shaped. As shown in the longitudinal cross-sectional view of FIG. 8 and the perspective external view of FIG. 10, the spiral excitation coil 1 in which the central cavity is slightly larger than the peripheral portion 10 on both sides of the plate 2 as shown in FIG. Combined to form a unit element.

Incidentally, FIG. 9 shows a side cross section similar to that of FIG. 1 in such a constitution. As can be seen from these respective drawings, in the first constitution example of the strong magnetic field electromagnetic pump of the present invention, the above-mentioned unit is used. A large number of elements are arranged in the axial direction, and the outer periphery thereof is surrounded in the radial direction by a magnetic frame 6 composed of a laminated core or the like having tooth portions 11 and recesses 12 for each unit element, as shown in FIG. A rod-shaped magnetic core 8 made of a ferromagnetic material is provided inside a non-magnetic metal pipe 7 arranged so as to communicate with the central holes 3 of the conductor discs 2.
Are arranged coaxially, and the molten metal is introduced into the gap 9 between the pipe 7 and the rod-shaped magnetic core 8.

In such a configuration, when the spiral excitation coils 1 forming each unit element are properly cascaded and a three-phase AC voltage is applied to both ends, a progressive magnetic field with a high magnetic flux density uniformly distributed in the gap 9 is generated. As a result, a strong thrust in the axial direction is generated by the interaction between the eddy current generated in the molten metal in the gap 9 and the traveling magnetic field, and acts as an electromagnetic pump for transferring the molten metal.

Next, a second embodiment of the magnetic flux converging type strong magnetic field electromagnetic pump of the present invention is shown in a vertical sectional view similar to FIG.
11, which is a combination of the side view and the side sectional view, and is shown in FIG. 12 together with the sectional view of the unit element. The illustrated configuration example is one in which the strong magnetic field electromagnetic pump of the present invention can be applied to a large capacity, and the diameter of the non-magnetic material pipe 7 is significantly larger than that of the illustrated configuration example 8 and Pipe 7 in it
The inner non-magnetic material pipe 13 having a more appropriately reduced diameter is coaxially arranged to form a double pipe structure, and the molten metal is introduced into the gap 9 between the two pipes 7 and 13, and the inner pipe 13 and the outer pipe Exciting coils 15 respectively surrounded by a laminated core 14 in the radial direction are arranged corresponding to the respective unit elements arranged on the outside of the pipe 7, and connected to the corresponding outer exciting coils 1 in series. The exciting coils 1 and 15 are arranged so that the traveling magnetic fields generated during the three-phase AC energization are superposed in the same phase in the gap 9 to form a uniform and strong traveling magnetic field, as compared with the first configuration example described above. It is intended to realize an electromagnetic pump suitable for a large capacity.

Next, regarding a third structural example suitable for applying the electromagnetic pump of the present invention to a larger capacity, a longitudinal sectional view similar to FIGS. 11 and 12 showing a second structural example, and a side view. The combination of figure and side sectional view is shown in FIG. 13 and FIG.
FIG. 15 is a perspective view of the partially cut external view similar to FIG. 10 showing the first structural example. The illustrated structural example is a laminated core provided inside the inner pipe 13 in the double-structured molten metal transportation pipe having the same structure as in the second structural example, in exactly the same manner as in the second structural example.
In each recess 12 of 14, each unit element arranged outside the outer pipe 7 and symmetrically corresponding to each unit element, that is, the thickness of the outer peripheral portion in contact with the inner pipe 13 A pair of spiral-shaped exciting coils 16 are respectively arranged with a conductor disc 17 having a thicker taste and a T-shaped radial cross-section sandwiched therebetween, and the outer exciting coil 1 and the inner exciting coil 16 correspond to each other. 16 and each of which are connected in series so that the traveling magnetic fields generated when a three-phase AC current is applied are superposed in the same phase in the gap 9 by both exciting coils 1 and 16 to form a stronger and uniform traveling magnetic field. Is.

In the magnetic flux converging type strong magnetic field electromagnetic pump of the present invention having the configuration described in detail above, for example, in the first configuration example, when the exciting coils constituting each unit element are appropriately connected and three-phase alternating current is applied, those A traveling magnetic field is generated in the non-magnetic material pipe surrounded by the exciting coil, and as a result, a thrust is generated by the interaction between the eddy current induced in the molten metal in the pipe and the traveling magnetic field to add to the molten metal and An electromagnetic pump is constructed. In that case, an eddy current again flows in the conductor disc inserted between the exciting coils, and as a result, the leakage magnetic flux decreases and the effective magnetic flux in the gap of the double structure pipe increases, which causes the molten metal to melt. The thrust that acts is further increased, and the transfer characteristics of the electromagnetic pump are dramatically improved.

In that case, eddy currents 18 distributed as shown in FIG. 16 flow in the conductor disk 2, and the eddy currents 18 concentrate due to the action of the slits 4 in the peripheral portion of the central hole 3 and thus leak. The magnetic flux is blocked, and as a result, the induced magnetic flux is efficiently converged in the central hole 3.

In such a case, as in the previously developed magnetic flux converging type electromagnetic pump, if the thickness of the conductor disk is constant up to the central portion, the eddy current flows concentrated around the central hole 3. In addition, there is a drawback that a locally overheated state causes a high temperature. In order to eliminate such defects and form a traveling magnetic field of high magnetic flux density uniformly distributed in the axial direction, in the present invention, as shown in FIG. 6, FIG. 8, FIG. 10 or FIG. The thickness in the peripheral portion of the central hole 3 of the plate is remarkably increased as compared with other portions to improve the radial cross-sectional shape to be T-shaped, and as a result, the radial effective inside the gap 9 of the double structure pipe is improved. It has the feature that the magnetic flux increases and the characteristics of the electromagnetic pump improve.

The magnetic flux distribution calculated for the unit element in the case of using the eddy current conductor disk of uniform thickness in the previously proposed magnetic flux converging type electromagnetic pump is as shown in FIG. In the strong magnetic field electromagnetic pump of the present invention, the magnetic flux distribution similarly calculated for the unit element in the case of using the conductor disc having a T-shaped radial cross section is as shown in FIG. It can be seen that increasing the thickness of the part is extremely effective.

Further, the magnetic flux shielding effect by the conductor disc in the case where the unit elements are provided inside and outside the pipe having the double structure of the electromagnetic pump of the present invention so as to face the unit elements respectively, the magnetic flux calculated in the same manner. The distribution is as shown in FIG. 20 when there is a conductor disk, as compared to FIG. 19 which shows the magnetic flux distribution when there is no conductor disk, and the outer unit shown in FIG. 17 and FIG. The same magnetic flux shielding effect as in the device is observed. Note that FIGS. 19 and 20 show the case where the conductor disk of the inner unit element has a constant thickness.

[0029]

As is apparent from the above description, in the magnetic flux converging type strong magnetic field electromagnetic pump of the present invention, the molten metal transfer can be achieved only by significantly changing the radial cross-sectional shape of the eddy current conductor disk. The dynamic efficiency and characteristics can be remarkably improved, and as a result, it is easy to realize a large capacity electromagnetic pump with a large discharge amount, and it is also possible to realize a super large electromagnetic pump applying the same principle. .

That is, the peripheral portion of the central hole of the conductor disc is thickened in the alternate repeated lamination of the spiral excitation coil and the eddy current conductor disc having slits in the radial direction of the conventionally proposed magnetic flux converging type electromagnetic pump. The effects of the present invention in which the radial cross-sectional shape is T-shaped are as follows.

(1) In the conductor disk for eddy currents, the action of the radial slits causes the eddy currents that intensively flow around the central hole to be dispersed in the axial direction to reduce the current density. It is possible to eliminate the local overheating state that has occurred.

(2) As described above, the radial cross-sectional shape of the conductor disk is T-shaped to reduce the current density in the peripheral portion of the central hole, and to reduce the local density in the peripheral portion of the central hole caused by the concentration of eddy currents. The occurrence of an overheated state is prevented, and as a result, the applied voltage can be increased and the propulsion output can be increased even for electromagnetic pumps of the same scale.

(3) When the radial cross-sectional shape of the conductor disk is T-shaped, concentrated eddy currents are dispersed axially along the nonmagnetic metal pipe in the central hole, so that the exciting coil and the conductor disk are The magnetic flux leakage from the teeth of the magnetic frame located in the front and back of the unit element consisting of a stack of The effective magnetic flux passing therethrough increases, and as a result, the thrust acting on the molten metal increases, the discharge amount increases, and the transport efficiency increases.

(4) In the strong magnetic field electromagnetic pump of the present invention, the heat conduction from the high temperature molten metal flowing inside the non-magnetic material pipe in which the inner diameter of the spiral excitation coil alternately laminated with the conductor discs communicates with the central hole is prevented. Therefore, the inner diameter of the conductor disk center hole is larger than the inner diameter of the conductor disk. Therefore, even if the peripheral portion of the conductor disk center hole is thickened and the radial cross section is T-shaped, there is no influence on the size.

[Brief description of drawings]

FIG. 1 is a side sectional view of a conventional magnetic flux focusing electromagnetic pump.

FIG. 2 is a vertical sectional view of the same electromagnetic pump.

FIG. 3 is a front view of an exciting coil of the electromagnetic pump.

FIG. 4 is a front view of a conductor disk in the electromagnetic pump.

FIG. 5 is a partially cutaway perspective view showing the external appearance of the electromagnetic pump.

6A and 6B are a front view and a side sectional view of a conductor disk in the magnetic flux convergence type strong magnetic field electromagnetic pump of the present invention.

FIG. 7 is a surface view and a side sectional view of an exciting coil of the electromagnetic pump.

FIG. 8 is a longitudinal sectional view of a first configuration example of the electromagnetic pump of the same.

FIG. 9 is a side sectional view of a first configuration example of the same electromagnetic pump.

FIG. 10 is a perspective view showing a partially broken external view of a first configuration example of the electromagnetic pump.

FIG. 11 is a vertical sectional view of a second configuration example of the same electromagnetic pump.

FIG. 12 is a diagrammatic view showing a combination of a side surface and a side cross section of a second configuration example of the electromagnetic pump together with a cross section of a unit element.

FIG. 13 is likewise a vertical cross-sectional view of a third configuration example of the electromagnetic pump.

FIG. 14 is a diagrammatic view showing a combination of a side surface and a side cross section of a third configuration example of the electromagnetic pump together with a cross section of a unit element.

FIG. 15 is a partially cutaway perspective view showing the external appearance of a third configuration example of the same electromagnetic pump.

FIG. 16 is a diagram showing a distribution of eddy currents flowing in a conductor disk of the electromagnetic pump.

FIG. 17 is a diagram showing a mode of magnetic flux distribution in a unit element of a conventional magnetic flux convergence type electromagnetic pump.

FIG. 18 is a diagram showing a mode of magnetic flux distribution in the unit element of the first configuration example of the magnetic flux convergence type strong magnetic field electromagnetic pump of the present invention.

FIG. 19 is a diagrammatic view showing a mode of magnetic flux distribution when there is no conductor disk in the inner unit element of the third configuration example of the electromagnetic pump.

FIG. 20 is a diagrammatic view showing an aspect of magnetic flux distribution when there is a conductor disk in the inner unit element of the third configuration example of the electromagnetic pump.

[Explanation of symbols]

1 Excitation coil 2 conductor disk 3 central hall 4 slits 5 vacant places 6 Magnetic frame 7 (Outside) Non-magnetic material pipe 8 Rod-shaped magnetic body 9 gap 10 Central Hall Area 11 Tooth 12 recess 13 Inside non-magnetic pipe 14 Inner magnetic frame 15, 16 inner excitation coil 17 Inner conductor disk 18 Eddy current

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 3, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 19

[Correction method] Change

[Correction content]

FIG. 19

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 20

[Correction method] Change

[Correction content]

FIG. 20

Claims (4)

[Claims] 1. An exciting coil having a plurality of layers which are coaxially engaged with each other and wound with the same polarity, and a radial slit which is interposed between each layer of the exciting coil and communicates with an outer peripheral edge of the exciting coil. A plurality of layers of conductor discs that share the slit and a hole that communicates with each other coaxially, and a magnetic closed circuit that surrounds the longitudinal cross-section outer periphery of the exciting coil and the conductor disc to form a magnetic closed circuit through the hole. A unit magnetic flux generating element is provided with a letter-shaped magnetic frame, a plurality of magnetic flux generating elements are closely arranged in the axial direction of the hole, according to the multi-phase AC energization of the exciting coil,
An eddy current generated in the conductor disk is concentrated around the hole along the slit to generate a progressive magnetic flux advancing in the axial direction in the hole sequentially communicated, and a magnetic closed circuit formed by the magnetic frame body. A magnetic flux concentration member that forms a part of the magnetic closed circuit sequentially in a non-magnetic material pipe penetrating the inside of the hole that sequentially communicates with the traveling magnetic flux generated in the hole in the same phase. In a magnetic flux converging electromagnetic pump that applies axial thrust to the molten metal in the non-magnetic material pipe by concentrating the traveling magnetic fluxes that are coaxially arranged and overlap each other in phase, the center of the conductor disk By increasing the thickness of the part, the radial cross-sectional shape is almost T
A magnetic flux converging type strong magnetic field electromagnetic pump characterized by being shaped like a letter. 2. The magnetic flux converging type strong magnetic field electromagnetic pump according to claim 1, wherein the magnetic flux concentrating member is a rod-shaped magnetic body. 3. A non-magnetic material pipe is coaxially arranged in the non-magnetic material pipe, and the non-magnetic material pipes are coaxially arranged in the non-magnetic material pipe so as to correspond to the magnetic flux generating elements of the unit. A plurality of layers of other exciting coils that are engaged and wound with the same polarity are arranged, and each of the other exciting coils is provided with a U-shaped magnetic frame body that surrounds the other exciting coil and forms a magnetic closed circuit through the hole. The other magnetic flux concentrating member is formed by superimposing, in the same phase, another traveling magnetic flux in the axial direction generated in the hole by the multi-phase alternating current conduction of other excitation coils of a plurality of layers. 1. The magnetic flux convergence type strong magnetic field electromagnetic pump described in 1. 4. Another conductor disk having an outer peripheral portion having an increased thickness and having a substantially T-shaped radial cross-section is interposed between the respective layers of the other exciting coils. The magnetic flux converging type strong magnetic field electromagnetic pump according to claim 3.