JP2001080576A - Magnetic mine sweeping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and lightweight magnetic mine sweeping device easy to handle, capable of securing a simulated magnetic flux range as wide as possible and of reducing electric power provided from outside. SOLUTION: This device consists of a refrigerating machine direct cooling style superconductive coil part 11 in which a cooling part of a gas circulation type heat accumulator style refrigerating machine 14 is mechanically contacted on a coil main body 15 made from a superconductive material wound up in a coil like shape through a heat conduction plate, a cooling part 12 radiating heat by taking heat generated from the refrigerating machine 14 in a heat radiator 17 through cooling water as the medium, and an electric power source control part 13 supplying electric power to the superconductive coil part 11 and the electric power source control part 13. Those components are loaded on a towed body and are towed by a ship or a helicopter. Magnetic mines are sympathetically detonated by magnetic flux generated from the superconductive coil part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic mine sweeping device for inducing and removing magnetic mine laid underwater or on the sea floor, and more particularly to a magnetic mine sweeping device for inducing magnetic mine using a superconducting coil.

[0002]

2. Description of the Related Art There is a magnetic detection type mine (hereinafter referred to as a magnetic mine) that detects a residual magnetism of a ship or the like and initiates an explosion. As a magnetic mine sweeping tool for sweeping such a magnetic mine, conventionally, a system as shown in FIGS. 12 and 13 has been known.

That is, as shown in FIG.
A long wire (copper wire) with a length of 100 to 300 m is stretched over the sea surface,
Towed by minesweeper. A simulated magnetic field is created by passing a current of about several thousand amps through the electric wire and returning the seawater to the seawater, and the simulated magnetic field induces a magnetic mine laid in the sea or on the sea floor. 12 (b) and FIG.
As shown in (c), for example, there is a method in which a magnetic mine is detonated by creating a loop having a radius of about 50 m at a distance of 200 m and towing a minesweeper while applying a similar current to the electric wire. Generally, the magnetic mine sweeper shown in FIG. 12A is called an I type, the magnetic mine sweeper shown in FIG. 12B is called a J type, and the magnetic mine sweeper shown in FIG. 12C is called a CL type. I have.

In such a system, a DC power source is mounted on the minesweeper, and a current of several thousand amps flows through an electric wire extending to the sea surface.
Large DC power supply is required.

Further, as shown in FIG. 13, a boat may be towed by a minesweeping helicopter. In this system, a generator is mounted on a boat to create a DC power supply, an electric wire (copper wire) is connected to the end, and the whole boat is towed by a minesweeping helicopter.

References relating to the magnetic mine sweeper are listed below.

[Specifications of "ships of the world" H9.11.21, new type minesweeper "Uraga" ・ "Ships of the world" 1990, October, P92 "sweeping tool", P106 "Hatsushima" type sweeping Boats ・ Journal of Defense Technology June 1997, P4 “New equipment for minesweeping” ・ “Ships in the World”, February 1993, P94 “Anti-Mine Action System”

[0008]

As described above, in the conventional method, a current is caused to flow through an electric wire extending over the sea surface,
He gave a simulated magnetic flux to a magnetic mine and induced the explosion. However, in order to pass a current of several thousand amps, if the diameter of the electric wire is 5 cm and the specific gravity is about 9, a thick electric wire of about 18 kg / m (actually, it is thought that a fine wire strand is used) is used. It becomes necessary, and in consideration of applying a covering vinyl around the electric wire and adding a float (a member for floating the electric wire) at a necessary point, the weight becomes about 20 kg / m. If this is extended by 300 m, the weight will be as much as 6 tons. In addition, a large DC power supply of about 400 to 900 kW is required to pass a current of several thousand amps through the electric wire, and this power supply equipment is close to 10 tons.

On the other hand, in order to simulate the magnetic flux distribution of a ship, simulated distribution using permanent magnets, simulated distribution using solenoid coils, and the like have been studied in recent years. This means that as shown in FIG. 14, many stages of solenoid coil magnets (VMMs: variable moment magnets) are stacked on one boat, and five or six of these boats are spliced in the vertical direction (towing direction), and the minesweeper uses them. Towing creates a magnetic flux distribution as if a ship were present, and is called a solenoid system. FIG. 14A is a diagram showing a structure of a VMM using a solenoid coil as a magnet, and FIG. 14B is a diagram showing a state in which a plurality of VMMs are arranged and towed by a minesweeper. FIG. 3C is a diagram illustrating a magnetic flux distribution of a simulated ship created by a plurality of VMMs. Even in the case of this solenoid type, the power supply from the boat requires the same amount as the method of sending power to electric wires as shown in FIGS.

[0010] In both the electric wire system and the solenoid system, it is possible to simulate by connecting any number of machines in the vertical direction (towing direction). There is a disadvantage that the distribution cannot be widened. In addition, the weight per vehicle is close to one ton, and power corresponding to that is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a magnetic mine sweeping tool which can take as large a simulated magnetic flux as possible, further reduce external power supply, and is small and lightweight and easy to handle. The purpose is to:

[0012]

According to the magnetic mine sweeper of the present invention, a superconducting material is wound in a coil shape, and the cooling portion of the gas circulating regenerator refrigerator is mechanically wound around the coil body via a heat conducting plate. And a refrigerator directly cooled superconducting coil portion having a structure for radiating heat of the coil body from the heat radiating portion of the gas circulation type regenerative refrigerator to the outside, and a refrigerator directly cooled superconducting coil portion. A cooling unit that takes in heat generated from the gas circulation type regenerator refrigerator into a radiator by using cooling water as a medium and dissipates heat, and a power supply that supplies drive power to the refrigerator direct cooling superconducting coil unit and the cooling unit And a control unit.

[0013] According to the magnetic mine sweeper of the above configuration, a magnetic mine can be induced by utilizing the magnetic flux generated from the directly cooled superconducting coil of the refrigerator. In this case, a superconducting coil generally used in a linear motor or the like requires expensive liquid helium, and it is necessary to always replenish the liquid helium. Since the liquid superconducting coil does not require liquid helium, a very inexpensive and easy-to-handle magnetic mine sweeper can be realized. Furthermore, the coil utilizing the superconducting phenomenon allows the magnetizing current from the outside to have a very small capacity, and once in the superconducting state, it can continue to generate the necessary magnetic flux even if the supply of the external current is cut off. is there.

Further, the power supply control unit may be configured to receive an externally supplied AC power supply, convert the AC power supply into a DC power supply, and supply the DC power supply to the refrigerator direct cooling type superconducting coil unit and the cooling unit. Then, even if the power supply equipment is mounted, the weight can be reduced.

[0015] Further, the refrigerator direct cooling type superconducting coil portion,
The cooling unit and the power control unit are housed in a towed body movable on the sea surface or under the sea. If a plurality of such towed bodies are connected in series or in parallel and towed by a ship or a helicopter, the distribution of magnetic flux density can be widened, and magnetic mines laid on the sea floor and under the sea can be effectively removed.

Further, by disposing a heat sink plate made of a metal having a high thermal conductivity at the bottom of the towed body, excess heat generated from the cooling unit and the power supply control unit can be radiated into seawater. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing an embodiment of the present invention, a magnetic mine sweeper using a superconducting coil will be described.

Magnetic minesweeping tools using superconducting coils are also required to be lighter in terms of coil diameter, coil cooling device, power supply equipment for generating an electric current to be supplied, and external dimensions and capacity of a container for accommodating them. .

Here, for example, a general superconducting coil used for a linear motor or the like has the entire coil attached to liquid helium. That is, the coil is about 4K (Kelvin)
The heat of vaporization of liquid helium is used to cool below a critical temperature. Therefore, replenishment of expensive liquid helium is always necessary.

Therefore, in the present invention, a refrigerator direct cooling type superconducting coil is used in which the heat of the coil is conducted by conduction and the heat is radiated to the outside by a regenerator.
No liquid helium is required.

In order to further facilitate handling, the total storage container is set to 3 m × 1 m × 1 m or less, and the total weight is 500
kg or less. With such dimensions and weight, for example, even when towing with a helicopter, it is possible to hover the minesweeper mounted on the minesweeping area while hovering, or to lift it into the aircraft from the sea. It is. Of course, when the minesweeper is towing, it is possible to move up and down to the surface.

On the other hand, the diameter of the coil is determined by the storage dimensions of 3 m × 1 m × 1 m. With a coil having a diameter of 1 m, the width of the distribution satisfying the required magnetic flux density is small. It is related to the sweep width and the time required to sweep a certain area.

That is, a ship with a displacement of 5,000 tons has dimensions of about 150 m in length, 15 to 20 m in width, about 10 m in depth and about 5 m in draft. The surface magnetic flux of the earth (about 200 to 450 mG) is magnetized on the hull of such a ship, and the entire hull is magnetized. During the voyage, it is magnetized by the earth's magnetic field. In addition, it is magnetized by the leakage magnetic field from the electronic equipment mounted in the ship. Therefore, a coil is generally wound around the entire hull, and a current is applied to demagnetize the magnetic field so that a magnetic field opposite to the magnetization direction is generated.

However, even if the magnetizing magnetic field is erased by the demagnetizing coil, only about 1/10 is demagnetized, and there is residual magnetism.
This remnant magnetism is detected by a magnetic mine and destroys a ship sailing above the mine. Therefore, the problem is how to match the remanence generated by the ship with the magnetic flux density around the ship with respect to the detection level of the magnetic mine. Smaller ships have lower magnetic flux density, so the detection level is lower,
If a large ship is set to this detection level, it can be detonated at a point far away from the ship and has no influence on the ship. Therefore, the detection level is increased and the detonation is performed near the ship.

Here, the residual magnetism of the ship is 150 m × 20
Considering the magnetism generated from a large magnet of m × 10 m, a magnetic flux distribution corresponding to the detection level of a magnetic mine is required in that the width is several times as large as 20 m and the length is several times as large as 150 m. On the other hand, the center magnetic flux of the superconducting coil having a diameter of about 1 m is large, but the magnetic field flowing to the surroundings is small, which naturally causes a limit.

Therefore, the magnetic mine minesweeper of the present invention of about 3 m × 1 m × 1 m is towed in a horizontal or vertical direction at a constant interval, so that a magnetic field distribution can be obtained in a wide area. Further, if the distribution is insufficient in the depth direction, the required sweeping magnetic field distribution at the required depth can be obtained by sinking and towing these towed bodies.

Next, as for the power supply, a saturation magnetic field is achieved with a current of about 200 A (about 1 kVA) for the coil dimensions of the present invention. Moreover, once the superconducting state is reached, no external current replenishment is required (since a permanent coil current flows), and a very small power supply is required.

As described above, by using a refrigerator direct cooling type superconducting coil, a very inexpensive and easy-to-handle magnetic mine sweeper free from liquid helium can be realized. Since the magnetizing current from the substrate needs only a very small capacity, once it is in a superconducting state, it is possible to continue to generate a necessary magnetic flux even when the supply of the external current is cut off.

The magnetic mine minesweeper of the present invention, which has been reduced in size and weight, can be obtained by towing two or three pieces at a constant horizontal or vertical interval according to the required sweeping width and payload.
The width of the minesweeping can be freely set, and a complicated magnetic flux distribution can be obtained by supplying currents of different magnitudes to the coils of the individual mining minesweeper. Further, when a distribution in the depth direction is required, it can be dealt with by sinking and towing the magnetic mine sweeper of the present invention.

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

FIG. 1 is a block diagram showing the configuration of a magnetic mine sweeper according to an embodiment of the present invention. FIG. 2 is a diagram showing the configuration of a towed body equipped with the magnetic mine sweeper, FIG. 2 (a) is a view of the towed body viewed from the front, and FIG. 2 (b) is a side view of the towed body. (C) is a view from the back of the tow body, and (d) is a view from the top of the tow body.

The magnetic mine sweeping tool of the present invention is for removing a magnetic detection type mine (magnetic mine) laid in the sea or on the sea floor, and includes a superconducting coil unit 11, a cooling unit 12, and a power supply control unit 13. These components are mounted on the towing body 21 in an arrangement as shown in FIG.

The superconducting coil section 11 is composed of a refrigerator directly cooled type superconducting coil, which will be described later, and is a section for generating a magnetic field by cooling the coil body 15 to a superconducting phenomenon temperature via the refrigerator 14. The cooling unit 12 is a part that takes in heat generated from the refrigerator 14 into the radiator 16 using cooling water as a medium and radiates heat. The cooling water is circulated by driving the pump 16. The power supply control unit 13 is a unit that converts AC power supplied from the outside (minesweeper) into DC power and supplies the DC power to the superconducting coil unit 11, and controls the opening and closing of the power supply, the control of the current flowing through the coil body 15, and the like. A relay circuit for changing the polarity of the current is included.

On the other hand, the towing body 21 is R. P (Fiber
A boat made of a strong material such as Reinforced Plastic (fiber reinforced plastic) is provided, and a heat sink plate 22 made of a metal having high thermal conductivity such as an aluminum alloy is arranged at the bottom of the boat. Refrigerator 14
It has a structure to radiate the heat generated from the water and the heat generated from the power supply control unit 13 into the seawater.

The towing body 21 has a waterproof and pressure-resistant structure, is provided with stabilizing wings 23a to 23c at the rear, and sends and receives a towing hook 24 and an external AC power supply and control signals at its tip. A waterproof connector 25 is provided.

Next, the superconducting coil 11 will be described with reference to FIGS. FIG. 3 is a diagram illustrating a configuration of the superconducting coil unit 11, and FIG. 4 is a diagram illustrating a configuration of a refrigerator 14 used for the superconducting coil unit 11.

The superconducting coil section 11 is composed of a refrigerator direct cooling type superconducting coil. As shown in FIG. 3, NbTi (niobium titanium), which is the material of the superconducting coil, is wound in a coil shape, and the coil body 15 is placed on a heat sink plate (heat conductive plate).
The cooling part 31 of the refrigerator 14 is brought into mechanical contact with the cooling part 31 through the part 30. Thereby, the heat from the coil body 15 is conducted to the cooling part 31 of the refrigerator 14 via the heat sink plate 30 and is radiated outside from the heat radiation part 32 of the refrigerator 14. The coil body 15 and the cooling part 31 of the refrigerator 14 are hermetically sealed by a vacuum vessel 33, and the inside thereof is kept at a vacuum.
With the above structure, the coil main body 15 can be easily cooled to the liquid helium temperature of 4 K, which is the superconducting phenomenon temperature.

On the other hand, the refrigerator 14 has a structure as shown in FIG. That is, the heat storage material 42 is disposed in the middle of the cylinder 41, and the gas in the cylinder 41 is used as a refrigerant, and the piston 43 is moved up and down to repeatedly compress and expand, so that the heat of the cooling portion 31 is repeated. The heat is moved to the piston 43 side, and this heat is radiated to the outside from the heat radiation part 32.

The refrigerator 14 uses He gas as a medium. In this case, in order to cool the cooling portion 31 to a temperature close to the superconducting phenomenon temperature of 4 K, Er ₃ N having a large specific heat at a low temperature is used.
i and the like are used. Generally, a refrigerator 1 using this method
4 is called a gas circulation type regenerator refrigerator.

When the coil body 15 is cooled by using the gas circulation type regenerator refrigerator 14, liquid helium becomes unnecessary. Moreover, after the He gas is first sealed in the refrigerator 14, the superconducting coil becomes maintenance-free, and is inexpensive and easy to handle.

Here, the magnetic flux density obtained by the electric wire and the magnetic flux density obtained by the superconducting coil will be compared.

For example, as shown in FIG.
When the current I (A) flows through (m), the magnetic flux density B (G) at the point P in the direction r (m) perpendicular to the electric wire is expressed by the following equation.

B = 1.257 × 10 ^-2 × I / 4πr ×
(Sin β1 + sin β2) Assuming that the electric wire L = 100 m and the current I = 2000 A, the distribution of the magnetic flux density B is as shown in FIG. Actually, since the return path of the current is seawater, there is a slight difference, but the state of the magnetic flux distribution (of the sweep width) perpendicular to the towing direction can be understood.

In the example shown in FIG. 6, the rotation about the L axis, that is, the magnetic flux density on the inner cylinder at r = 50 m and r = 70 m is shown. On the other hand, in a region that hardly affects β1 and β2, that is, in a region 20 m inside both ends, r = 90
When m, the magnetic flux density is about 20 mG. As shown in FIG. 7, the width at which the magnetic flux density becomes 20 mG at a depth of 50 m is about 1
It is about 50 m (75 m × 2).

On the other hand, the diameter is about 1 m (actually 0.8 m
In the case of a superconducting coil having an outer diameter (coil of outer diameter), the coil is obtained by applying a current of 130 A to approximately 8000 turns of a coil having a cross section of 0.1 m × 0.1 m. FIG. 8 shows the magnetic flux density distribution of the superconducting coil at a water depth of 10 m and a water depth of 60 m. For example, Z =
The width at which the magnetic flux density becomes 20 mG at 10 m (water depth 10 m) is about 70 m. Therefore, in order to correspond to a width of 150 m at which the magnetic flux density becomes 20 mG at a water depth of 50 m by the previously calculated electric wire, as shown in FIG. 9, two superconducting coils are arranged side by side at an interval of 80 m. As a result, about 1
A magnetic flux density of 20 mG is obtained with a width of 50 m, and a similar effect can be obtained by sinking this to 40 m and towing.

In the magnetic mine sweeping tool of the present invention, a simulated magnetic flux is applied to a magnetic mine laid on the sea floor or in the sea to induce explosion by utilizing the characteristics of such a superconducting coil. As shown in FIG. 1, a coil main body 1 constituting a superconducting coil unit 11
The heat of No. 5 is conducted to the refrigerator 14 and radiated to the outside. This heat is taken into the radiator 17 of the cooling unit 12 using the cooling water as a coolant and is radiated to the sea.

As an external input power supply, AC (for example, AC
100V, 50 / 60Hz, AC2 when helicopter towing
(00 V, three-phase, 400 Hz) power supply is sufficient, and 22 kVA is sufficient as a power supply for a pump for a refrigerator, a pump for a radiator, and a superconducting coil. The current flowing through the coil body 15 is sufficient if it is 5 V and 200 A, and this is stored in the towing body 21 as shown in FIG. that time,
The cooling unit 12 including the pump 16 and the radiator 17 and the power control unit 13 for supplying DC power are mounted on a heat sink plate 22 having a bottom of the towing body 21 as a metal. Thereby, the heat generated from each part can be radiated to the sea via the heat sink plate 22. It should be noted that the weight of the entire towing body 21 shown in FIG.

To such a tow body 21, bundled with a towing wire and connected with about 10 cabtire cables including a relay control signal line for controlling an AC power supply, a pump and the like, and an AC power supply from a helicopter or minesweeper. And sends a control signal.

When the approximate weight of the magnetic mine sweeper of the present invention is estimated, the superconducting coil portion 11 (when the case is made of an aluminum alloy and a vacuum vessel) is approximately 300 kg, and the cooling portion 12 is 40 k.
g, the power control unit 13 is 40 kg, and the towing body 21 body (F.
R. Plastic such as P and heat sink plate) is 100
kg, and can be realized with a lightweight body of about 480 kg in total.

Next, an operation example of the magnetic mine sweeper of the present invention will be described.

FIG. 10 shows an example in which a plurality of magnetic mine sweepers of the present invention are connected and operated in parallel. FIG. 10A is a diagram of the sea surface viewed from above, and FIG. 10B is a diagram of the sea surface viewed from the side.

Using two towed bodies 101a and 101b equipped with the magnetic mine sweeper of the present invention, expanders 103a and 103b are respectively attached to the wire 102 in order to maintain a distance H between them at about 80 m, for example. And be towed by minesweeper or helicopter. Thereby, the spread of the magnetic flux can be obtained in a direction (lateral direction) orthogonal to the towing direction.

The two towing bodies 101a and 101b may be connected in series at a predetermined interval in the vertical direction, so that the towing operation may be performed. In such a case, the magnetic flux is generated in the towing direction (vertical direction). Can be obtained.

FIG. 11 shows an example in which a plurality of magnetic mine minesweepers of the present invention are connected in parallel, and further operated by sinking. FIG. 11A is a diagram of the sea surface viewed from above, and FIG. 11B is a diagram of the sea surface viewed from the side.

In the same manner as described above, two towed bodies 101a and 101b each equipped with the magnetic mine sweeper of the present invention are used, and in order to maintain an interval H between them of, for example, about 80 m, expanders are respectively attached to the wires 103. 102a and 102b are provided.
Further, sedimentation devices 104a and 104b are provided after the towing bodies 101a and 101b, respectively, and the floats 105a and
5b, the towed bodies 101a and 101b are settled and operated by D = 40 (m), for example.

The expanders 102a and 102b and the settler 104
For a and 104b, change the angle of the ladder,
Set the deployment width and settling distance. Destroyed by D = 40m, the sweeping width (magnetic flux density 20mG) at 50m depth
Distribution) of 150 m.

The two tow bodies 101a and 101b may be connected in series at a predetermined interval in the vertical direction so that they settle down and tow. In such a case, the towing direction (longitudinal direction) may be used. The spread of the magnetic flux can be obtained.

In FIGS. 10 and 11, for example, two towing bodies 101a and 101b are connected vertically, two sets of these are connected in parallel and operated, and the magnitude, direction and the like of each current are changed. Thus, various magnetic flux patterns can be obtained. Furthermore, it is also possible to connect and operate in series or parallel using a plurality of towing bodies. Naturally, if the sweeping width is allowed, a single towing body may be towed by a helicopter or a ship to perform a floating sweep or a sinking sweep.

[0059]

As described above in detail, according to the present invention, a configuration is used in which a magnetic mine is detonated by using a direct cooling superconducting coil of a refrigerator which does not require liquid helium and utilizing a magnetic flux generated from the superconducting coil. As a result, it is possible to realize a magnetic mine sweeping tool that is extremely small in weight and easy to handle. Also, external power supply input for obtaining the magnetic flux distribution is reduced to several hundredths. In addition, since the supply of the external power can be cut off after being magnetized, a very economical minesweeper can be provided.

Further, by connecting a plurality of towed bodies equipped with the magnetic mine sweeper of the present invention in series or in parallel, and towing,
The distribution of magnetic flux density can be broadened to effectively remove magnetic mines.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a magnetic mine sweeper according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a towed body equipped with the magnetic mine sweeper, wherein FIG. 2 (a) is a view of the towed body from the front, and FIG. 2 (b) is a view of the towed body from a side. FIG. 2C is a view from the back of the tow body, and FIG. 2D is a view from the top of the tow body.

FIG. 3 is a diagram showing a configuration of a refrigerator direct cooling type superconducting coil used for the magnetic mine sweeper of the present invention.

FIG. 4 is a diagram showing a configuration of a gas circulation type regenerator refrigerator in the refrigerator direct cooling type superconducting coil.

FIG. 5 is a diagram for explaining a magnetic flux density obtained by a current flowing through an electric wire.

FIG. 6 is a diagram showing a magnetic flux density distribution when the electric wire L is 100 m and the current I is 2000 A;

FIG. 7 is a diagram for explaining a width of a magnetic flux density of 20 mG at a depth of 50 m by an electric wire.

FIG. 8 is a view showing a magnetic flux distribution of a superconducting coil.

FIG. 9 is a diagram showing a magnetic flux distribution when superconducting coils are arranged in parallel.

FIG. 10 is a view showing an example in which the magnetic mine sweepers of the present invention are operated in parallel. FIG. 10 (a) is a view of the sea surface from above, and FIG. 10 (b) is a view of the sea surface from the side. FIG.

FIG. 11 is a view showing an example of the case where the magnetic mine sweepers of the present invention are operated in parallel and settled, and FIG. 11 (a) is a view of the sea surface from above, and FIG. 11 (b) is a view of the sea surface from the side. The figure I saw.

FIG. 12 is a view showing an example of a conventional magnetic mine minesweeper (an example of electric wire towing by a minesweeper), wherein FIG. 12 (a) is an I type magnetic mine minesweeper, and FIG. Magnetic mine sweeper,
FIG. 3C is a diagram showing a CL type magnetic mine sweeper.

FIG. 13 is a diagram illustrating an example of a conventional magnetic mine sweeping tool (an example of power supply and electric wire towing by a sweeping helicopter).

FIG. 14 is a view showing an example of a conventional VMM (Variable Moment Magnet) minesweeper, and FIG.
FIG. 2B shows a structure of the MM, FIG. 2B shows a state in which a plurality of VMMs are arranged and towed by a minesweeper, and FIG. 2C is a magnetic flux distribution of the simulated ship created by the plurality of VMMs. FIG. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Superconducting coil part 12 ... Cooling part 13 ... Power supply control part 14 ... Refrigerator 15 ... Coil main body 16 ... Pump 17 ... Radiator 21 ... Towing body 22 ... Heat sink plate 23a-23c ... Stable wing 24 ... Towing hook 30 ... heat sink plate (heat conductive plate) 31 ... cooling part 32 ... heat radiation part 33 ... vacuum vessel 41 ... cylinder 42 ... heat storage material 101a, 101b ... towed body 102 ... wires 103a, 103b ... expanders 104a, 104b ... sedimentator 105a, 105b ... Float

Claims (4)

[Claims] 1. A superconducting material is wound into a coil shape, and a cooling portion of a gas circulation type regenerative refrigerator is mechanically brought into contact with the coil body via a heat conducting plate, so that heat of the coil body is circulated by the gas circulation. Direct cooling superconducting coil portion having a structure for radiating heat to the outside from the heat radiating portion of the regenerative refrigerator, and heat generated from the gas circulation type regenerator refrigerator of the direct cooling superconducting coil portion of the refrigerator. And a power control unit for supplying drive power to the refrigerator direct cooling type superconducting coil unit and the cooling unit, and a power supply by the power control unit. A magnetic mine sweeping tool characterized in that magnetic mine explosion is induced by utilizing magnetic flux generated from the above-mentioned refrigerator direct cooling type superconducting coil part upon supply. 2. The power supply control section receives an externally supplied AC power supply, converts the AC power supply into a DC power supply, and supplies the DC power supply to the refrigerator direct cooling type superconducting coil section and the cooling section. The magnetic mine sweeper according to claim 1, wherein: 3. The magnetic mine according to claim 1, wherein the refrigerator direct cooling superconducting coil unit, the cooling unit, and the power control unit are housed in a towed body movable on the sea surface or in the sea. Minesweeper. 4. The towed body is made of a boat made of a strong material, and a heat sink plate made of a metal having high thermal conductivity is arranged at the bottom of the towed body, and extra heat generated from the cooling unit and the power control unit is provided. The magnetic mine sweeping device according to claim 3, wherein the magnetic mine sweeping device has a structure for dissipating a large amount of heat into seawater.