JPH06209560A - Electromagnetic pump - Google Patents

Abstract

PURPOSE:To support the inside structure in an electromagnetic pump with high supporting rigidity. CONSTITUTION:In an electromagnetic pump, in which conductive fluid is made to flow between an outer duct 1 and an inner duct 2, and this conductive fluid is with a center return pipe 10, and also either an inner or an inner iron core are provided inside the inner duct 2, the self loads on either side of the inner duct 2, the center return pipe 10, the inner stator 5, and the inner iron core are supported with a supporting plate 13 connected to a pump casing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an annular linear type three-phase induction type electromagnetic pump, and particularly to a high temperature such as a coolant circulation pump in a liquid metal cooling type reactor using liquid metal as a coolant. The present invention relates to an electromagnetic pump used in the environment.

[0002]

2. Description of the Related Art Liquid sodium coolant circulating pumps for liquid sodium cooled nuclear reactors which use liquid metal as coolant (sodium is often used as liquid metal, and henceforth referred to as liquid sodium). The large capacity three-phase induction electromagnetic pump used in high temperature environment is flat
It is divided into linear type and annular linear type.

This annular linear type electromagnetic pump is
Since the cross section of the flow path is annular, ALIP (Annular
It is called Linear Induction Pump and is suitable for large capacity reactor coolant circulation pump because of its highly reliable and safe duct structure.

6 and 7 show the basic structure of a conventional ALIP. The ALIP is a concentric double pipe whose duct is made of stainless steel and comprises an outer duct 1 and an inner duct 2, and a sodium flow path 3 is formed between these ducts 1 and 2. Further, since ALIP has a circular duct shape and is excellent in strength, it can be said that it is a highly reliable duct.

An outer stator 4 and an inner stator 5 are provided on the outer side of the outer duct 1 and on the inner side of the inner duct 2, respectively. As shown in FIG. 7B, the outer stator 4 and the inner stator 5 are comb-shaped. It is composed of tooth-shaped stator cores 6, 7 and ring-shaped outer coil 8 and inner coil 9.

Liquid sodium, which is a liquid metal, flows through the sodium flow path 3 in the direction shown by the arrow in FIG. 6, and the sodium flow path 3 is a one-through type in which liquid sodium flows only in one direction. As shown, there is a center return type in which the flow direction of liquid sodium is reversed in the center return pipe 10.

The outer coil 8 and the inner coil 9 are U
Phase, V phase, W phase are repeatedly arranged in this order, and a progressive magnetic field is generated by passing a three-phase alternating current through each of these phases. When this progressive magnetic field is passed through a duct in which liquid sodium is present, liquid sodium is generated. A voltage is induced therein and an induced current flows. The induced current and a part of the component of the traveling magnetic field act to generate an electromagnetic force, and the electromagnetic force generates a thrust force.

As a basic configuration type of ALIP, the stator core 6 and the ring-shaped outer coil 8 are provided outside the outer duct 1 as described above.
A tabular stator (multi-stator) type electromagnetic pump in which the stator core 7 and the ring-shaped inner coil 9 are provided inside the inner duct 2, and the stator core and the ring-shaped electromagnetic pump are provided only outside the outer duct 1. There is a coil, and inside the inner duct 2, there is a single stator (single stator) type electromagnetic pump in which an inner iron core for forming a magnetic circuit is housed.

Since the space in which the stator is installed is an inert gas atmosphere, the single stator type electromagnetic pump is different from the table type stator electromagnetic pump in that the inner coil is not provided, and other configurations are the same. Less than,
The double stator type ALIP will be described.

When an electromagnetic pump is applied as a main circulation pump of a liquid sodium cooled reactor, the electromagnetic pump main body is generally supported by using a flange 12 connected to the upper end of the pump casing 11 on the installation surface. Is supported vertically.

The outer duct 1 and the outer stator 4 are structurally the most rigid structure of pump parts.
Since it is arranged in the vicinity of 1, it is easy to support its own load, and it is generally supported by a support structure connected to the pump casing 11. In contrast to the outer structure, the inner structure including the inner duct 2, the inner stator 5 (or the inner core), and the center return pipe 10 is disposed with the sodium flow path 3 in between, and thus is supported by the following method. Was there.

Regarding the small-capacity electromagnetic pump that has been manufactured so far, the inner structure is supported by radially connecting a plurality of blades in the radial direction at both ends of the inner duct 2 including the inner stator 5 (or the inner iron core). , A means for connecting the end portion of the blade to the outer duct 1 was adopted.

As another conventional example, Japanese Patent Laid-Open No. 2-416
The invention disclosed in Japanese Patent Publication No. 83 describes a method in which a flange is provided at the base end portion of the inner duct, and the flange is sandwiched and fixed between the outer ducts.
The invention of No. 4984 describes means for accurately mounting the inner core on the axis of the duct of the circular pipe.

The method of wiring the power cable to the coil is generally such that the outer coil 8 is guided to the inside of the pump casing 11 and the outer stator 4 through the opening of the flange 12 used for installing the pump on the outer coil 8. Wired. On the other hand, a method of introducing a power cable into the inner coil 9 of the double stator type ALIP has not been devised.

[0015]

By the way, the electric output 1
When an electromagnetic pump is applied as a main circulation pump of 000 MWe class, it is affected by the number of installed pumps and system pressure loss, but the dimensions of the electromagnetic pump are about 2 m in pump diameter, 2 to 6 m in stator length, and the weight of pump is About 50 to 1 per unit
It is expected that it will be a large equipment structure of about 00 tons.

Here, the structure of the double-stator type ALIP is constructed by using an outer structure composed of a pump casing 11, an outer stator 4 and an outer duct 1, and an inner duct 2,
When distinguishing the inner structure composed of the inner stator 5 and the center return pipe 10, the weight ratio is about 7: 3 for the outer structure: the inner structure. Its own weight accounts for about 30 tons.

In the main circulation electromagnetic pump of 100 tons class, the outer structure of 70 tons in structure is arranged close to the pump casing 11 which is the most rigid structure of the pump parts, so that its own load can be easily supported. Generally, this is supported by a support structure connected to the pump casing 11.

On the other hand, since the support of the inner structure of 30 tons is installed by sandwiching the sodium flow path with respect to the outer structure, applying the conventional support method will give the desired support rigidity. There is a problem that it cannot be done.

Further, the capacity of the main circulation pump of a liquid sodium cooled nuclear reactor is usually in the range of 100 to 300 ³ / min, but such a large capacity electromagnetic pump is doubled due to the demand for miniaturization of the pump. The stator type ALIP is most suitable. Therefore, the method of introducing the power cable into the inner coil becomes a problem.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic pump capable of supporting an internal structure with high supporting rigidity.

[0021]

In order to solve the above-mentioned problems, an electromagnetic pump according to the present invention causes a conductive fluid to flow between an outer duct and an inner duct, and the conductive fluid is passed through a center return pipe. In an electromagnetic pump that reverses and provides either the inner stator or the inner iron core inside the inner duct, the inner duct, the center return pipe, or the self-load of either the inner stator or the inner iron core is applied to the homp casing. It is supported by a connected support plate.

[0022]

In the present invention having the above-mentioned structure, the component having the maximum rigidity in the pump structure portion is the pump casing, and the support plate is supported by this pump casing, whereby the inner duct, the center return pipe, and the inner stator are formed. It is possible to support an internal structure composed of either one of the above and the internal core with high supporting rigidity.

[0023]

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

FIG. 1 shows the overall construction of a first embodiment of an electromagnetic pump according to the present invention. It should be noted that the same or corresponding portions as those of the conventional configuration will be described with the same reference numerals as those in FIGS. 6 and 7.

As shown in FIG. 1, the electromagnetic pump of this embodiment is a double-stator type ALIP, and has a concentric double pipe structure of an outer duct 1 and an inner duct 2 for flowing a conductive fluid such as liquid metal sodium. Sodium flow path 3
Are formed. An outer stator 4 is provided outside the outer duct 1, and an inner stator 5 is provided inside the inner duct 2.

Each of the outer stator 4 and the inner stator 5 is composed of a comb-teeth-shaped inner core 6, 7, a ring-shaped outer coil 8 and an inner coil 9. Liquid sodium flows through the sodium flow path 3 in the direction indicated by the arrow, and the sodium flow path 3 is connected to the center return pipe 1.
At 0, the flow direction of liquid sodium is reversed.

The electromagnetic pump body is a pump casing 11.
It is installed on the installation surface using the flange 12 connected to the upper end portion, and is supported in a state in which the pump is suspended vertically.

A support plate 13 is connected to the lower end of the pump casing 11, and an opening 14 and a center return pipe flow path 15 are formed in the support plate 13 as shown in FIG. 2 (A). The portion 14 and the center return pipe channel 15 are liquid sodium channels.

The support plate 13 has an outer portion 16 of the support plate on which the external structure is located with the center return pipe channel 15 interposed therebetween, and an internal structure (inner duct 2, inner stator 5,
The center return pipe 10) is located inside the support plate inner part 17, and the support plate outer part 16 and the support plate inner part 17 are connected by the blades 18 provided radially.

Since the blade 18 is located at the pump suction port, it is formed in an appropriate streamline shape so that cavitation does not occur as shown in FIG. 2 (B). Further, a power cable introducing groove 19 for laying a power cable to the inner coil 9 is formed through the blade 18.

The pump casing 11 has a support plate outer portion 16
The outer duct 1 is connected to the outermost peripheral portion of the
The outer stator 4 is connected to the inner peripheral portion of the support member 6 and is supported by being installed on the support plate outer portion 16. Inner duct 2
Is connected to the outer periphery of the support plate inner portion 17, and the inner stator 5 is installed and supported on the support plate inner portion 17.
The center return pipe 10 is the inner side 1 of the support plate.
It is connected and fixed to the inner peripheral portion of 7.

As shown in FIG. 1, an upper touch stop 20 is provided above the center return pipe 10 in order to prevent the inner structure from swaying around the support plate 13 as a fulcrum.

Next, the operation of this embodiment will be described.

The component having the maximum rigidity in the electromagnetic pump structure is the pump casing 11. By supporting the support plate 13 with this pump casing 11, the internal structure can be supported with high supporting rigidity.

As in this embodiment, a double stator type AL
Regarding the support plate 13 applied to the IP, a power cable introduction groove 19 that connects the outer stator 4 to the inner stator 5 is formed in the support plate 13, and the power cable introduction groove 19 is formed.
By laying the power cable to the inner coil 9 inside, the internal structure supporting structure and the power cable introducing structure to the inner coil 9 can be integrated, and the pump structure can be rationalized. The power cable introducing groove 19 can also serve as an inlet for the inert gas in the space of the inner stator 5.

FIG. 3 shows a second embodiment of the electromagnetic pump according to the present invention. The same parts as those of the first embodiment will be described with the same reference numerals. In this embodiment, the mounting position of the support plate 13 is not the lower end portion of the pump casing 11 as in the first embodiment, but is the center return portion of the sodium flow path 3, and the inner stator 5 is below the inner portion 17 of the support plate. Let it hang down.

A power cable introducing groove 19 for laying a power cable to the inner coil 9 is formed through the support plate 13. At the bottom of the internal structure, the support plate 13
In order to prevent rolling of the internal structure with the fulcrum as a fulcrum, a lower touch stop 21 is provided. Therefore, in this embodiment, the same effect as that of the first embodiment can be obtained. The rest of the configuration and operation are the same as in the first embodiment, so a description thereof will be omitted.

FIGS. 4 and 5 show a third embodiment of the electromagnetic pump according to the present invention, and the same parts as those of the first embodiment will be described with the same reference numerals. In this embodiment, as shown in FIGS. 4 and 5, the mounting position of the support plate 13 is set to the second position.
As in the embodiment, it is used as the center return portion of the sodium flow path 3, and the outer wall portion 16 of the support plate and the inner wall portion 17 of the support plate are reduced in thickness to make them thinner.

As described above, according to the present embodiment, the support plate outer part 16 and the support plate inner part 17 are made thin, so that the manufacturability of the support plate 13 is improved and the weight of the support plate 13 is reduced. . Further, as shown in FIG. 4, the space for introducing the power cable 22 is also expanded, which facilitates the conduction of the inert gas in the inner stator space. The rest of the configuration and operation are the same as in the first embodiment, so a description thereof will be omitted.

The present invention is not limited to the above embodiments, but various modifications can be made. For example, in the above-described embodiment, the example applied to the double-stator type ALIP has been described, but the present invention is not limited to this and can be applied to the single-stator type ALIP. When applied to this single-stator type ALIP, only the configuration in which the inner coil 9 is not provided is different as compared with the double-stator type.

The single stator type ALIP is
An inner core for forming a magnetic circuit is housed inside the inner duct, and the inner structure is composed of the inner duct, the center return pipe, and the inner core.

[0042]

As described above, according to the electromagnetic pump of the present invention, the self-load of the internal structure including any one of the inner duct, the center return pipe, the inner stator and the inner iron core is connected to the horn casing. By supporting with the support plate provided, the internal structure can be supported with high support rigidity. As a result, the safety function of the nuclear power plant can be reliably maintained.

[Brief description of drawings]

FIG. 1 is an enlarged view of essential parts showing a first embodiment of an electromagnetic pump according to the present invention.

2A is a cross-sectional view taken along line AA of FIG.
(B) is sectional drawing in the BB line of (A).

FIG. 3 is an enlarged view of a main part showing a second embodiment of the electromagnetic pump according to the present invention.

FIG. 4 is an enlarged view of an essential part showing a third embodiment of the electromagnetic pump according to the present invention.

5 is an enlarged cross-sectional view showing a support plate in FIG.

FIG. 6 is an enlarged view of a main part showing a conventional electromagnetic pump.

7A is a cross-sectional view taken along the line CC of FIG.
(B) is a partially enlarged view of the outer stator and the inner stator.

[Explanation of symbols]

 1 outer duct 2 inner duct 3 sodium flow path 4 outer stator 5 inner stator 6 inner iron core 7 inner iron core 8 outer coil 9 inner coil 10 center return pipe 11 pump casing 12 flange 13 support plate 14 opening 15 center return pipe flow passage 16 Support plate outside part 17 Support plate inside part 18 Blade 19 Power cable introduction groove

Claims (1)

[Claims] 1. A conductive fluid is caused to flow between an outer duct and an inner duct, the conductive fluid is inverted by a center return pipe, and at least one of an inner stator and an inner core is provided inside the inner duct. In the electromagnetic pump, the self-load of any one of the inner duct, the center return pipe, the inner stator and the inner iron core is supported by a supporting plate connected to the hoop casing.