JP2001119920A - Electromagnetic pump and fluid circulating apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic pump, where the fastening of its laminated core to it required during its operation and its transportation is performed, and the heat removing quality of the heat generation of the inside of its stator which is preformed by the conductive fluid can be improved, and further, the stable flow of sodium can be performed. SOLUTION: With an outside duct 3 and an inside duct provided concentrically, the space between them is used as the passage of a conductive fluid, and an outside laminated core 6 is disposed on the outer peripheral side of the outside duct 3, and an inside laminated core is disposed on the inner peripheral side of the inside duct. By fitting respectively stator coils 8 into the respective slots of the outside laminated core 6, a progressive magnetic field is formed is the passage of the conductive fluid existing therein. Side plates and an alignment plate 15 are formed respectively out of the materials having nearly equal thermal expansion coefficients to each other. The side plates interpose between them both the laminar-direction ends of the laminated core 6. The alignment plate 15 determines the circumferential, radial, and axial positions of the respective blocks of the laminated core 6, by fastening to the laminated core 6 these side plates from the outer periphery of the laminated core 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump which applies a traveling magnetic field to a conductive fluid from the outside, induces an induced current in the conductive fluid, and causes pumping by the interaction between the induced current and an external magnetic field. And a fluid circulation device using the electromagnetic pump, particularly a liquid metal sodium coolant for a fast breeder reactor, a lithium circulation pump used for nuclear fusion, or a liquid metal transfer pump in electromagnetic metallurgy suitable for electromagnetic metallurgy. The present invention relates to a pump and a fluid circulation device using the pump.

[0002]

2. Description of the Related Art In general, a three-phase induction type electromagnetic pump distributes three-phase AC windings in the order of each phase in the flow direction of a conductor fluid, that is, the axial direction of the electromagnetic pump. An induced current is caused to flow in the conductive fluid by applying a phase alternating current, generating a traveling magnetic field in the flow direction of the current, and applying the so-called “Fleming's right-hand rule”. An electromagnetic force is generated by the interaction between the induced current and the traveling magnetic field, and a propulsive force of the conductive fluid is obtained by the electromagnetic force to be applied as a pump. This electromagnetic force is the same as the force that generates torque in the induction motor, the thrust in the linear motor, and the like.

[0003] Such three-phase induction type electromagnetic pumps are roughly classified into two types, a flat linear type electromagnetic pump and an annular linear type electromagnetic pump. The electromagnetic pump of the present invention relates to an improvement of the annular linear electromagnetic pump. Since the cross section of the flow path of the fluid is annular, the
ar Linear Induction Pump
(Hereinafter referred to as ALIP), which is adopted as a large-capacity pump or a pump for the conductive fluid 2 requiring high reliability because the duct structure has high reliability and safety.

[0004] Regarding the basic structure of such ALIP,
This will be described with reference to FIGS.

[0005] The electromagnetic pump 1 flows a conductive fluid 2 such as liquid metal sodium. The outer duct 3 and the inner duct 4 constitute a concentric double duct having a double duct structure. The conductive fluid 2 flows in an annular flow path 5 formed by the inner duct 3 and the inner duct 4.

[0006] Outside the outer duct 3, an outer laminated core 6 in which a number of electromagnetic steel sheets are stacked is arranged in a circumferential direction.
A large number of annular outer stator coils 8 are axially arranged in slots 7 formed at the outer duct 3 side end of each outer laminated core 6, and these outer stator coils 8 carry three-phase alternating current. Wired to create a magnetic field. Further, the laminated core 6 has a configuration in which end plates are installed at both ends in the circumferential direction of a large number of electromagnetic steel plates, and the electromagnetic steel plates are fixed by fixing tools inserted into holes provided in the circumferential direction of the laminated core 6. I have.

In the electromagnetic pump 1 configured as described above, by supplying a three-phase alternating current to the outer stator coil 8, the conductive fluid 2 flows through the annular flow path 5 from the fluid inlet 10 which is a suction port. Is transferred to the outside from the fluid outlet 11 which is a discharge port. In addition, Joule loss generated in the outer stator coil 8, internal heat generation such as iron loss generated in the outer laminated core 6, heat input from the conductive fluid 2, and the like are disposed on the outer peripheral side of the outer laminated core 6. In general, a refrigerant is circulated from the outside in the casing 12 to remove heat.

In recent years, studies have been made to increase the capacity of such an electromagnetic pump 1 and adopt it as a circulation pump for the main circulation system of a fast breeder reactor. In this case, as shown in FIG. 7, the inner stator core 9 is also provided with the inner stator coil 13, and the outer stator coil 8 and the inner stator coil 13 excite the pump so that the traveling magnetic field is increased. By increasing the power, it is expected that the size of the electromagnetic pump will be reduced, and that the reliability and operation efficiency will be further improved.

Further, the electromagnetic pump 1 may be entirely covered with a casing 12 in a hermetically sealed manner, and may be immersed in the conductive fluid 2 for use. In such a case, it is necessary to develop a technology that can be used even at a high temperature where no external refrigerant circulation equipment is required. However, there is a limit to each heat-resistant temperature of the inner laminated core 9, the outer laminated core 6, the inner stator coil 13, the outer stator coil 8, and the like. It is necessary to remove heat with the conductive fluid 2 flowing through the annular flow path 5 through the flow path.

For example, when used as a circulating pump in the main circulation system of a fast breeder reactor, the temperature of liquid metal sodium as the conductive fluid 2 is about 350 ° C. Since the internal heat generated by the stator is added to the sodium temperature, the outer laminated core 6, the inner laminated core 9, the outer stator coil 8, the inner stator coil 13 and the like are used at a high temperature higher than the sodium temperature.

[0011]

In the above-described electromagnetic pump, the coil 8 is made of a wire material, the laminated core 6 is made of a magnetic material such as a silicon steel plate, and the duct is made of a material such as austenitic stainless steel. The material of the structure is different for each member. Therefore, it is necessary to absorb the difference in thermal expansion between the electromagnetic pump members when the temperature of the conductive fluid 2 changes. Furthermore, heat generated inside the stator has a limit to the heat-resistant temperature of the stator coil and the iron core, and is removed by the conductive fluid 2 flowing through the annular flow path 5 via the outer duct 3, the inner duct 4, or the casing 12, By absorbing the difference in thermal expansion, the laminated core 6
Is required to press the pipe 3 against the duct 3. Further, the above-described electromagnetic pump is a device for transferring the conductive fluid 2, and it is necessary to reduce the influence of the fluid flow such as the vortex flow and the swirling flow of the conductive fluid 2 on the structure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a fixing required during operation or transportation by an electromagnetic pump, and to remove heat generated by a conductive fluid generated inside the stator. It is an object of the present invention to provide an electromagnetic pump and a fluid circulating apparatus using the same, which can improve the flow rate and allow a stable flow of sodium.

[0013]

In order to achieve the above object, according to the first aspect of the present invention, an outer duct and an inner duct are concentrically arranged and a conductive fluid flow path is provided therebetween.
Placing the outer laminated core on the outer peripheral side of the outer duct and disposing the inner laminated core on the inner peripheral side of the inner duct,
Stator coils are arranged in the slots of the respective outer laminated cores, and in an electromagnetic pump that forms a traveling magnetic field in the flow path where a conductive fluid is present, a side plate sandwiching both ends of the outer laminated core in the laminating direction, An electromagnetic pump, wherein the side plate is fixed from the outer peripheral side and an alignment plate for determining the circumferential, radial and axial positions of the laminated core blocks is made of a material having substantially the same coefficient of thermal expansion. I will provide a.

According to a second aspect of the present invention, in the electromagnetic pump according to the first aspect, the outer peripheral side of the alignment plate is radially supported by a frame, and the alignment plate and the frame are aligned in the axial direction of the duct. Provided is an electromagnetic pump characterized in that it is made of a combination of materials whose thermal expansion difference is reduced.

According to the third aspect of the present invention, the outer duct and the inner duct are concentrically arranged, a conductive fluid flow path is provided between the outer duct and the inner duct, and an outer laminated iron core is arranged on the outer peripheral side of the outer duct. An electromagnetic pump that arranges an inner laminated core on the inner peripheral side of an inner duct, arranges a stator coil in each slot of each outer laminated core, and forms a traveling magnetic field in the flow path where a conductive fluid is present, In the outer laminated iron core arranged on one end side along the axial direction of the duct,
An electromagnetic pump provided with an axial clamp mechanism for absorbing thermal expansion in a duct axial direction.

According to a fourth aspect of the present invention, the outer duct and the inner duct are concentrically arranged to provide a flow path for a conductive fluid therebetween, and an outer laminated core is arranged on the outer peripheral side of the outer duct. An electromagnetic pump that arranges an inner laminated core on the inner peripheral side of an inner duct, arranges a stator coil in each slot of each outer laminated core, and forms a traveling magnetic field in the flow path where a conductive fluid is present, An electromagnetic pump is provided, wherein a spring mechanism is provided as a radial clamp for pressing the outer laminated core against the outer duct.

According to a fifth aspect of the present invention, in the electromagnetic pump according to the fourth aspect, a plurality of spring mechanisms are arranged by a spring plate having a fixed length along the duct axis direction, and the frame is arranged along the duct axis direction. , Each of which supports a central portion in the longitudinal direction of each spring plate.

According to a sixth aspect of the present invention, there is provided the frame according to the second or fifth aspect, and the radial clamp mechanism according to the fourth aspect, wherein a ring for radially supporting the frame and the radial clamp are provided. An electromagnetic pump characterized by providing a space in the electromagnetic pump.

According to the invention of claim 7, the outer duct and the inner duct are concentrically arranged to provide a flow path for the conductive fluid therebetween, and the outer laminated iron core is arranged on the outer peripheral side of the outer duct. An electromagnetic pump that arranges an inner laminated core on the inner peripheral side of an inner duct, arranges a stator coil in each slot of each outer laminated core, and forms a traveling magnetic field in the flow path where a conductive fluid is present, The outer laminated core disposed on the other end side along the axial direction of the duct,
Provided is an electromagnetic pump characterized in that a sliding portion that allows radial movement is provided between a member that supports the electromagnetic pump and a member that supports the electromagnetic pump.

According to the invention of claim 8, the outer duct and the inner duct are concentrically arranged to provide a flow path for the conductive fluid therebetween, and the outer laminated core is arranged on the outer peripheral side of the outer duct. An electromagnetic pump that arranges an inner laminated core on the inner peripheral side of an inner duct, arranges a stator coil in each slot of each outer laminated core, and forms a traveling magnetic field in the flow path where a conductive fluid is present, An electromagnetic pump is provided, wherein each of the ducts has a support structure at one end, and a steadying member is provided in a fluid flow path at the other end of the duct.

According to the ninth aspect of the present invention, the outer duct and the inner duct are concentrically arranged to provide a flow path for the conductive fluid therebetween, and the outer laminated iron core is arranged on the outer peripheral side of the outer duct. An electromagnetic pump that arranges an inner laminated core on the inner peripheral side of an inner duct, arranges a stator coil in each slot of each outer laminated core, and forms a traveling magnetic field in the flow path where a conductive fluid is present, A conical member was installed on an end portion of the inner stator, which is an inlet side of the conductive fluid to the flow path, and a hole was formed in a peripheral wall of the conical member to allow the inflow of the conductive fluid. An electromagnetic pump is provided.

According to a tenth aspect of the present invention, there is provided the electromagnetic pump according to the ninth aspect, wherein a swirling flow preventing member for preventing a swirling flow of the conductive fluid is provided on an outer surface of the conical member. provide.

According to the eleventh aspect, in the first to tenth aspects,
The electromagnetic pump according to any one of the above is installed vertically in the tank, fluid was introduced from a fluid inlet provided at the lower end of the tank, and was guided from the lower plenum in the tank to the upper plenum through the electromagnetic pump. Thereafter, in the fluid circulation device configured to cause the fluid to flow out from a fluid outlet provided in a side wall portion of the tank, the upper plenum that receives the fluid that has risen from the electromagnetic pump has a window for allowing the fluid to flow out on a peripheral wall thereof. A flow guide formed of a cylindrical casing with an upper plate and guiding the fluid to the window in the upper plenum and gradually reducing the fluid flowing out of the window to the fluid outlet. And a flow skirt for the fluid circulation device.

According to a twelfth aspect of the present invention, in the fluid circulation device according to the eleventh aspect, an upward slope is provided on the conductive fluid contact side of the upper plate of the casing, and a gas is provided at an upper end position of the slope of the upper plate. Provided is a fluid circulation device provided with a hole.

According to a thirteenth aspect of the present invention, in the fluid circulating device according to the eleventh or twelfth aspect, the bellows is installed at a flow path wall portion on a tank side connected to a duct constituting an annular flow path of the electromagnetic pump. A fluid circulation device is provided.

According to the fourteenth aspect, in the eleventh aspect,
3. The fluid circulation device according to any one of 3 to 3, wherein the flow guide has a trumpet shape with an enlarged diameter on the upper side, and an upper end is open in the upper plenum, and a drain for fluid circulation is provided on a lower end wall of the flow guide. Provided is a fluid circulation device having holes.

According to the fifteenth aspect, the eleventh to the first aspects
4. A fluid circulating apparatus according to any one of the above items 4, wherein a pipe for supplying or discharging nitrogen from outside the electromagnetic pump is provided inside the electromagnetic pump.

[0028]

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

First, an embodiment of the electromagnetic pump will be described with reference to FIGS. Note that the overall configuration of the electromagnetic pump is substantially the same as that shown in FIGS. 6 and 7, and therefore, FIGS. 6 and 7 are referred to as they are.

FIG. 1 is an axial partial sectional view showing a main part of an electromagnetic pump according to the present embodiment, and FIG. 2 is a radial partial sectional view of the same.

As shown in these figures, in the electromagnetic pump of the present embodiment, the outer laminated iron core 6 has a configuration in which both ends in the radial direction are sandwiched by side plates 14, and the outer laminated iron core 6 radially surrounds the outer duct 3. Are located in The pair of side plates 14 protrude toward the outer peripheral side of the one outer laminated core 6 sandwiched therebetween and are opposed to each other. Alignment plate 1
5 are fitted and fastened by bolts 15a.

As described above, the outer laminated iron core 6 has its circumferential and radial positions aligned with the rear alignment plate 15.
Is determined by The side plate 14 and the alignment plate 15 are made of a material having the same coefficient of thermal expansion, for example, the same material in order to make the same thermal expansion thereof.
And those having sufficient strength at high temperature, for example, SUS30
4 is applied.

With such a configuration, when the electromagnetic pump 1 is operated, the temperature is substantially the same since the side plate 14 and the alignment plate 15 can be considered as an integral structure. Therefore, by using the same material for the side plate 14 and the alignment plate 15, a difference in thermal expansion between the side plate 14 and the alignment plate 15 during operation of the electromagnetic pump can be eliminated, and a gap is generated between the outer laminated cores 6. Can be prevented. This eliminates the need for a thermal expansion absorbing mechanism, simplifies the structure, and allows no gap between the outer laminated cores 6, thereby reducing the load applied to the support member of the outer laminated core 6.

Further on the outer peripheral side of the outer laminated core 6, a frame 16 and a backing ring 17 for radially supporting from the outer peripheral side of the alignment plate 15 are arranged. The frame 16 and the backing ring 17 are fixed by bolts 17a, and a plurality of these are connected along the axial direction. The frame 16 and the backing ring 17 are made of a combination of materials capable of reducing a difference in thermal expansion between the side plate 14 and the alignment plate 15 during operation of the pump. For example, when the temperature difference is small, the material is the same, and when the temperature difference is large, the material is a combination of a magnetic nickel alloy (for example, Inconel) and stainless steel.

In the electromagnetic pump 1 thus configured, the alignment plate 15 and the frame 16 are
When the same material such as S304 is used, the temperature difference between the alignment plate 15 and the frame 16 can be reduced during operation of the electromagnetic pump, and the difference in thermal expansion during operation of the electromagnetic pump can be suppressed. When the temperature difference is large and the stacking height is large, a part or all of the material of the alignment plate 15 may be made of a material having a small coefficient of thermal expansion such as Inconel, so that the thermal expansion difference between the alignment plate 15 and the frame 16 is reduced. Can be reduced.

The backing ring 17 is arranged with a certain gap from the alignment plate 15. Thereby, a space for passing wiring and the like can be secured between the alignment plate 15 and the backing ring 17, and the configuration can be made compact, for example, by installing the coil lead wiring along the axial direction inside the backing ring 17.

Next, at one axial end (upper part in FIG. 1) of the outer laminated core 6, an iron core holder 18 is fixed to the alignment plate 15 by bolts (not shown). On the same end side of the frame 16, an upper holding plate 19 is fixed by bolts 19a. Then, the upper iron core presser 18 and the upper presser plate 19 are
Are positioned in the circumferential and radial directions.
Further, between the outer surface of the upper holding plate 19 and the flange 22 of the frame 16, an axial spring plate 21 made of an elastic plate is sandwiched and fixed by bolts 22a. The axial spring plate 21 has an axial spring plate receiver 2 mounted on the upper iron core retainer 18.
3 is in contact.

Accordingly, the axial displacement between the outer laminated core 6 and the alignment plate 15 is limited by the upper core holder 1.
The force is transmitted to the axial spring plate 21 via the axial spring plate 8 and the axial spring plate receiver 23, and a reaction force is generated by the deformation of the axial spring plate 21, thereby forming a clamp mechanism. The material of the axial spring plate 21 is a non-magnetic material, and is a nickel alloy having high high-temperature strength, for example, Inconel.

Under such a configuration, when the material of the alignment plate 15 and the frame 16 is, for example, SUS304, the thermal expansion between the alignment plate 15 and the frame 16 when the pump height is large during the pump operation. Although the difference occurs, the axial spring plate 21 made of a material having a small thermal expansion such as Inconel is in the elastic behavior range even if the thermal expansion difference is received, and the thermal expansion difference between the outer laminated core 6 and the frame 16 is reduced. Can be absorbed.

On the other hand, on the back of the alignment plate 15, a radial spring plate 2 comprising a plurality of leaf springs is provided.
4 are arranged. This radial spring plate 2
4 are bolts 24a on the frame 16 at the center of each.
, And both end portions elastically abut against a radial spring plate receiver 25 provided on the back surface of the alignment plate 15, thereby forming a clamp mechanism. That is, the radial displacement between the outer laminated core 6 and the alignment plate 15 is transmitted to the radial spring plate 24 via the radial spring plate receiver 25. Then, a reaction force is generated by the deformation of the radial spring plate 24, and thereby a clamping mechanism is configured.

The functions required of the clamp mechanism configured as described above will be described below. From the viewpoint of heat radiation of the stator, it is necessary to secure a contact surface pressure at the contact surface between the outer duct 3 and the outer laminated iron core 6 to reduce the contact thermal resistance. At the time of pump operation, the gap between the outer laminated core 6 and the outer duct 3 tends to be wider than at the time of assembly. That is, the contact surface pressure tends to decrease. Therefore, in the present embodiment, the radial spring plate 24 is deformed in advance at the time of assembly so that a reaction force is generated. Thereby, even if the gap between the outer laminated core 6 and the duct 3 is widened during operation, the two are pressed against each other by the elastic force of the spring plate 24 to overcome the gap, and a predetermined contact surface pressure can be secured. is there.

As described above, according to the configuration of the present embodiment,
In any operation, the outer laminated core 6 and the duct 3
As a result, the heat radiation from the stator to the outside can be ensured to prevent an excessive rise in temperature of the coil, and the soundness of the coil insulating member can be ensured.

According to the above-described structure in which the center of the radial spring plate 24 is fixed by the bolts 24a, both ends of the radial spring plate 24 can be free ends. The displacement may be unaffected by the thermal displacement of adjacent members. Therefore, even if a difference in thermal expansion occurs between the radial spring plate 24 and the alignment plate 15 made of a different material, the radial clamping mechanism is free from a load because both ends are free and is not affected by thermal expansion. realizable.

Next, the sliding portion on the other end side (the lower portion in FIG. 1) of the outer laminated core 6 will be described. As shown in FIG. 1, a core presser 26 is provided at the lowermost position of the outermost laminated core 6.
The outer laminated core 6 and the alignment plate 15 are placed on the iron core retainer 26. The lower surface of the iron core presser 26 is slidably supported on a bottom plate 29 via a slide plate 27 and a key 28. Then, the lower surface of the iron core retainer 26 and the upper surface of the slide plate 27 are subjected to, for example, a surface treatment in a high-temperature inert gas, for example, Colmonoy, Stellit.
e, Surface treatment for reducing the coefficient of friction such as thermal spraying of chromium carbide is applied.

According to such a configuration, even if the members in the electromagnetic pump are relatively displaced due to the difference in thermal expansion depending on the temperature condition in each operation state, the relative displacement by providing the slide plate 16 below the outer laminated iron core 6. Slip is possible, and the occurrence of excessive stress can be prevented by reducing the friction at the lower part of the stator. In addition, the outer laminated core 6 and the duct 3
Can be maintained at a predetermined value.

The sliding portion may be configured to reduce friction by using a rotating body such as a ball bearing instead of the slide plate 27.

Next, an embodiment of a fluid circulation device using an electromagnetic pump will be described with reference to FIGS.

FIG. 3 is an overall configuration diagram, and FIGS.
4 is an enlarged view of the lower part and the upper part of FIG.

[0049] This fluid circulating apparatus is generally described in which an electromagnetic pump is installed vertically in a tank, fluid is introduced from a fluid inlet provided at the lower end of the tank, and from the lower plenum in the tank to the upper plenum through the electromagnetic pump. After being guided, the fluid flows out from a fluid outlet provided in the side wall of the tank.

That is, the electromagnetic pump 1 is installed in the tank 30, and the electromagnetic pump 1 sucks the conductive fluid 2 from the lower plenum 41 and the duct 3 forming the annular flow path 5.
In the section, the pressure of the conductive fluid 2 is increased by electromagnetic force. Then, the pressurized conductive fluid 2 flows into the upper plenum 32 through the flow guide 31 and flows out of the window 33, and then descends the flow skirt 34 and the casing 12, and is formed by the intermediate seal 35 and the tank 30. It passes through the formed intermediate plenum 36 and flows out of the tank. A part of the conductive fluid 2 passes through the intermediate seal 35 to form a liquid level 37 in the tank, and returns to the main system line of the conductive fluid 2 through the overflow nozzle 38.

More specifically, as shown in FIG. 4, a steadying member 43 is provided between flow paths formed between the inner duct 4 and the outer duct 3. This steady rest member 43
May be attached to both the outer duct 3 and the inner duct 4, or may be attached to only one side. And
The mounting position of the steady rest member 43 is attached to the lower part of the duct, and the cross-sectional shape of the steady rest member 43 is square,
It has an elliptical shape and other streamlines.

With such a steady member 43, the width of the flow path through which the conductive fluid 2 flows becomes constant in the circumferential direction, and the eccentricity of the inner and outer stators 40 and 42 is prevented. That is, when the upper part of the electromagnetic pump is fixed, the lower part of the duct 3 is prevented from swinging in the circumferential direction and the radial direction.

Accordingly, the vibration in the circumferential direction during the operation of the electromagnetic pump can be reduced, and the eccentricity between the inner stator and the outer stator 40 can be prevented. Furthermore, since the steady member 34 is arranged between the flow paths formed by the inner duct 4 and the outer duct 3, the flow path width of the conductive fluid can be fixed.

A conical member 4 is provided below the inner stator.
The conical member 44 is provided with a conductive fluid 2.
Hole 45 into which the water can flow. The conical member 44 has a thin structure in order to reduce the load on the device. During a thermal transient in which the temperature of the conductive fluid 2 changes rapidly, the conical member 44 is connected to the casing 1 of the inner stator 42.
It is assumed that stress is applied between the conical member 44 and the casing 12 because the temperature is not equal to that of the casing 2. In order not to generate this stress, a plurality of holes 45 through which the conductive fluid 2 flows are formed in the conical member 44.

According to such a configuration, when the temperature of the conductive fluid 2 changes during the operation of the electromagnetic pump 1, the conductive fluid 2 flows inside the conical member 44, and the conductive fluid 2 flows from the inside of the inner stator 42. The heat can be radiated into the sexual fluid 2.

The conical member 44 below the inner stator 42 is provided with a plurality of anti-rotation ribs 46 arranged in a cross shape or other spaced arrangement, and is provided with an inlet portion 30a of the tank 30.
To prevent the conductive fluid 2 from flowing from swirling.

According to such a configuration, the conductive fluid 2 flowing into the electromagnetic pump 1 is prevented from swirling at the pump inlet, and the flow loss due to the extra vortex can be reduced.

FIG. 5 is an enlarged view of the upper plenum 32 on the conductive fluid outlet side of the tank 30.

The upper plenum 32 is constituted by a double cylindrical tube closed by an upper plate 47, and a plurality of windows 33 through which the conductive fluid 2 flows are formed in the outer cylindrical tube. The conductive fluid 2 flows from the outlet of the electromagnetic pump 1 to the upper plenum 32.
After passing through the window 33 of the upper plenum 32, descends along a flow skirt 34 provided on the outer peripheral side thereof, and is discharged to the outside of the tank.

The window 33 inside the flow skirt 34
The flow guides 53 and 54 are installed at the height position and at the position of the gap between the inside and the outside of the double cylindrical tube serving as the upper plenum 32.

The flow guides 53 and 54 are provided in the window 3
The vortex of the conductive fluid 2 generated at the entrance / exit portion of the third fluid 3 can be prevented, and the stress concentration due to the vortex can be reduced.

Further, the fluid contacting side (lower surface) of the upper plate 47 of the plenum has a gradient toward the outside of the upper plate 47, and the plate thickness of the upper plate 47 becomes thinner toward the outside. A gas vent hole 48 is formed at the outermost peripheral position of the slope portion of the upper plate 47.

At the start of operation of the electromagnetic pump, in particular, it is expected that gas is mixed in the conductive fluid, and this gas collects in the upper part of the plenum 32 and the collected gas is collected in the upper plate 47.
Is collected at the outer peripheral portion of the upper plate by the gradient of the upper plate, transported through the gas vent hole 48 between the casing 12 and the flow skirt 34, and discharged through the gas discharge pipe 39 into the tank liquid level 37.

A bellows 54 is provided at the flow path wall on the tank 30 side which is connected to the duct 3 constituting the annular flow path 5 of the electromagnetic pump.

According to such a configuration, the difference in thermal expansion between the structural members of the electromagnetic pump can be absorbed. That is, the casing 12 of each electromagnetic pump 1 has a thick structure to constitute a load transmission path of the electromagnetic pump 1. On the other hand, the duct 3 has a thin structure in order to reduce the loss due to the eddy current generated by the magnetic field of the electromagnetic pump 1. For this reason, at the time of the transient when the temperature of the conductive fluid 2 changes suddenly, the casing 12 and the duct 3 do not become equal in temperature, so that a difference in thermal expansion occurs between them, and particularly, the duct 3 having a thin structure has a stress. Is expected to concentrate.

On the other hand, in the present embodiment, the bellows 55 is provided between the casing 12 and the duct 3, and the bellows 54 absorbs the difference in thermal expansion. During the change, the difference in thermal expansion between the electromagnetic pump structural members can be absorbed.

Further, a flow guide 50 is provided at a continuous portion between the duct 3 and the bellows 54. The flow guide 50 has a trumpet shape whose diameter increases on the upper side, and the upper end is open to the upper plenum 32.
A drain hole 52 for fluid flow is provided in the lower end wall of the zero.

According to such a configuration, the flow guide 5
With 0, the pressure loss due to the sudden spread of the conductive fluid 2 from the duct 3 to the plenum 32 can be prevented, the separation of the conductive fluid 2 is prevented, and the pressure loss due to the sudden spread can be reduced. The drain hole 52 of the flow guide 50 prevents the conductive fluid 2 from collecting between the bellows 54 and the flow guide 50 when the conductive fluid 2 is drained, and is easily discharged.

As described above, the outer stator 40 composed of a high-voltage coil and an iron core is installed inside the electromagnetic pump 1, and therefore, from the viewpoint of preventing dielectric breakdown of the high-voltage coil. Usually, nitrogen is enclosed.
In this case, the electromagnetic pump 1 is completely sealed by the casing 12. However, since the temperature of the stator usually rises to about 500 ° C., the nitrogen temperature inside the pump also rises. Increase and decrease following.

Therefore, in this embodiment, for the purpose of controlling the internal pressure to be constant, a pipe 51 for injecting or discharging nitrogen is used.
Is provided. The pipe 51 is externally laid inside the electromagnetic pump through a conduit penetrating the upper plenum 32, and is externally controlled at a constant pressure.

According to such a configuration, nitrogen can be circulated throughout the inside of the stator by the action of supplying or discharging nitrogen sealed in the electromagnetic pump.

[0072]

As described above, according to the present invention, by using the same material for the side plate and the alignment plate, the difference in thermal expansion is reduced, and an electromagnetic pump having a simple structure without a thermal expansion absorbing mechanism is required. Can be provided. Further, since no gap is formed between the outer laminated cores, the load applied to the laminated core supporting member can be reduced.

According to the present invention, the difference in thermal expansion between the alignment plate and the frame can be reduced, and the difference in thermal expansion between the laminated core block and the frame can be absorbed.

Further, according to the present invention, by maintaining the contact surface pressure between the laminated core block and the duct during any operation, heat radiation from the stator to the outside is ensured, and the excessive temperature of the coil is maintained. The rise can be suppressed, and the soundness of the coil insulating member can be ensured.

Further, according to the present invention, since both ends are free even if the thermal expansion difference between the radial spring plate and the alignment plate made of dissimilar material occurs, no load is applied. Unaffected by swelling.

According to the present invention, by providing a space between the alignment plate and the backing ring,
The wiring of the coil outlet can be installed in the axial direction inside the backing ring, and the size can be reduced. Furthermore, by reducing the friction at the lower portion of the stator, the members in the electromagnetic pump can relatively slide, and can maintain the contact surface pressure between the outer duct and the outer laminated core.

When fixing the upper part of the electromagnetic pump,
By providing a steady rest at the lower part of the duct and fixing the inner stator and the outer stator, circumferential vibration during operation of the electromagnetic pump can be reduced, and eccentricity between the inner stator and the outer stator can be prevented. Further, by providing the steadying member between the flow paths of the conductive fluid between the inner duct and the outer duct, the flow width of the conductive fluid can be fixed.

Further, according to the present invention, the temperature inside the inner stator can be radiated into the conductive fluid by flowing the conductive fluid into the inside of the conical body. Prevents swirling flow of conductive fluid, reduces flow fluctuation of conductive fluid flowing into upper plenum, reduces gas accumulated in plenum, absorbs thermal expansion and elongation of duct, reduces pressure loss at outlet, and improves overall stator interior Nitrogen circulation etc. can be achieved.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part showing an embodiment of an electromagnetic pump according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an overall vertical sectional view showing one embodiment of a fluid circulation device according to the present invention.

FIG. 4 is an enlarged view showing a lower part of FIG. 3;

FIG. 5 is an enlarged view showing an upper part of FIG. 3;

FIG. 6 is a perspective cutaway sectional view showing a basic configuration of the electromagnetic pump.

FIG. 7 is a cross-sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic pump 2 Conductive fluid 3 Outer duct 4 Inner duct 5 Annular channel 6 Outer laminated core 7 Slot 8 Outer stator coil 9 Inner laminated core 10 Fluid inlet 11 Fluid outlet 12 Casing 13 Inner stator coil 14 Side plate 15 Alignment Plate 16 Frame 17 Backing ring 18 Upper core retainer 19 Upper retainer plate 20 Key 21 Axial spring plate 22 Flange 23 Axial spring plate receiver 24 Radial spring plate 25 Radial spring plate receiver 26 Iron core retainer 27 Slide plate 28 Key plate 29 Reference Signs List 30 tank 31 flow guide 32 upper plenum 33 window 34 flow skirt 35 intermediate seal 36 intermediate plenum 37 liquid level 38 overhaul nozzle 39 gas discharge pipe 40 outside Stator 41 Lower plenum 42 Inner stator 43 Steady member 44 Conical member 45 Hole 46 Rib 47 Upper plate 48 Gas vent hole 49 Bellows 50 Flow guide 51 Nitrogen injection pipe 52 Plenum internal flow guide 53 Flow guide between plenum and flow skirt 54 Flow guide 55 Bellows

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayoshi Nakazaki 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Yokohama Office (72) Inventor Minoru Funato 2--4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Inside Toshiba Keihin Works (72) Inventor Kotaro Marukawa 2-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Keihin Works

Claims (15)

[Claims] 1. An outer duct and an inner duct are concentrically arranged to provide a flow path for a conductive fluid between them, an outer laminated iron core is arranged on an outer peripheral side of the outer duct, and an inner peripheral of the inner duct is arranged. In an electromagnetic pump that arranges an inner laminated core on the side and arranges a stator coil in a slot of each of the outer laminated cores to form a traveling magnetic field in the flow path where a conductive fluid is present, A side plate sandwiching both ends in the stacking direction, and a circumferential direction of each of the stacked core blocks by fixing the side plate from the outer peripheral side,
An electromagnetic pump comprising: an alignment plate for determining a position in a radial direction and an axial direction; 2. The electromagnetic pump according to claim 1, wherein the alignment plate has its outer peripheral side supported by a frame in a radial direction, and the alignment plate and the frame have a difference in thermal expansion along the duct axial direction. An electromagnetic pump characterized by a combination of reduced materials. 3. An outer duct and an inner duct are concentrically arranged, a conductive fluid flow path is provided between them, and an outer laminated iron core is arranged on an outer peripheral side of the outer duct, and an inner periphery of the inner duct is provided. In an electromagnetic pump in which an inner laminated core is disposed on the side and a stator coil is disposed in each slot of each outer laminated core to form a traveling magnetic field in the flow path where a conductive fluid is present, the axial direction of the duct An electromagnetic pump provided with an axial clamping mechanism that absorbs thermal expansion in the axial direction of the duct, on the outer laminated core disposed at one end side along the axis. 4. An outer duct and an inner duct are arranged concentrically, a conductive fluid flow path is provided between them, an outer laminated iron core is arranged on an outer peripheral side of the outer duct, and an inner periphery of the inner duct is provided. In an electromagnetic pump that arranges an inner laminated core on the side and arranges a stator coil in each slot of each of the outer laminated cores to form a traveling magnetic field in the flow path where a conductive fluid is present, the outer laminated core is An electromagnetic pump provided with a spring mechanism as a radial clamp for pressing the outer duct. 5. The electromagnetic pump according to claim 4, wherein a plurality of spring mechanisms are arranged with spring plates having a fixed length along the duct axis direction, and each spring plate is provided on a frame arranged along the duct axis direction. An electromagnetic pump characterized in that a central portion in the length direction is supported. 6. A frame according to claim 2 or 5, and a radial clamping mechanism according to claim 4, wherein a space is provided between a ring for radially supporting the frame and the radial clamp. An electromagnetic pump characterized in that: 7. An outer duct and an inner duct are concentrically arranged to provide a flow path for a conductive fluid therebetween, and an outer laminated iron core is arranged on an outer peripheral side of the outer duct, and an inner periphery of the inner duct is provided. In an electromagnetic pump in which an inner laminated core is disposed on the side and a stator coil is disposed in each slot of each outer laminated core to form a traveling magnetic field in the flow path where a conductive fluid is present, the axial direction of the duct An electromagnetic pump, characterized in that a sliding portion allowing radial movement is provided between the outer laminated core disposed on the other end side along the line and a member supporting the outer laminated core. 8. An outer duct and an inner duct are concentrically arranged, a conductive fluid flow path is provided between them, an outer laminated iron core is arranged on an outer peripheral side of the outer duct, and an inner peripheral of the inner duct is provided. In an electromagnetic pump in which an inner laminated core is disposed on the side and a stator coil is disposed in a slot of each of the outer laminated cores to form a traveling magnetic field in the flow path where a conductive fluid is present, each of the ducts has one end. An electromagnetic pump having a support structure, wherein a steadying member is provided in a fluid flow path at the other end of the duct. 9. An outer duct and an inner duct are concentrically arranged to provide a flow path for a conductive fluid therebetween, and an outer laminated iron core is arranged on an outer peripheral side of the outer duct, and an inner peripheral of the inner duct is provided. In an electromagnetic pump that arranges an inner laminated core on the side and arranges a stator coil in a slot of each of the outer laminated cores to form a traveling magnetic field in the flow path where a conductive fluid is present, A conical member is provided on an end portion side which is an inlet side of the conductive fluid to the flow path, and a hole is formed in a peripheral wall of the conical member to allow the inflow of the conductive fluid. Electromagnetic pump. 10. The electromagnetic pump according to claim 9, wherein
An electromagnetic pump, wherein a swirling flow preventing member for preventing a swirling flow of a conductive fluid is provided on an outer surface side of the conical member. 11. A lower plenum in the tank, wherein the electromagnetic pump according to claim 1 is installed vertically in a tank, and fluid is introduced from a fluid inlet provided at a lower end of the tank. In the fluid circulating device, which is guided from the electromagnetic pump to the upper plenum through the electromagnetic pump and then flows out from a fluid outlet provided in a side wall portion of the tank, the upper plenum receiving the fluid raised from the electromagnetic pump includes the fluid A flow guide that is formed by a cylindrical casing with an upper plate having a window on the peripheral wall thereof for flowing out the fluid, guides the fluid to the window in the upper plenum and gradually increases in diameter, and flows out of the window. And a flow skirt for lowering the fluid to the fluid outlet. 12. The fluid circulation device according to claim 11, wherein an upward slope is provided on a conductive fluid contact side of an upper plate of the casing, and a vent hole is provided at an upper end position of the slope of the upper plate. A fluid circulation device characterized by the above-mentioned. 13. The fluid circulation device according to claim 11, wherein a bellows is provided at a flow passage wall portion on a tank side connected to a duct constituting an annular flow passage of the electromagnetic pump. apparatus. 14. The fluid circulation device according to claim 11, wherein the flow guide has a trumpet shape whose diameter is increased at an upper side, and an upper end is opened in an upper plenum. A fluid circulation device, characterized in that a drain hole for fluid circulation is provided in a lower end wall of the fluid circulation device. 15. The fluid circulating device according to claim 11, wherein a pipe for supplying or discharging nitrogen from outside is provided inside the electromagnetic pump. .