JP5223043B2 - Vibration generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize heat intrusion from the outside, to keep a superconducting coil in a superconducting state, and to certainly transmit electromagnetic force generated in the superconducting coil to an installation surface. <P>SOLUTION: A vibration generating device comprises: a storage container 10 for fixing a superconducting coil C1 therein and storing liquid nitrogen; a heat insulation container 20 for storing the storage container 10; a storage container 30 for fixing a superconducting coil C2 therein and storing liquid nitrogen; a heat insulation container 40 for storing the storage container 30; a slide mechanism making the superconducting coils C1 and C2 oppose each other, and capable of vertically sliding the heat insulation container 20 and the heat insulation container 40; a power supply device for supplying current which generates predetermined electromagnetic force repulsing each other; a counter weight 61 for adding reaction force corresponding to a vibration load in a lower part direction of the heat insulation container 20; and a vibration transmitting portion 70 provided on a lower part of the heat insulation container 40, having a centering function according to the inclination of an object and transmitting vibrations. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a vibration generator using a superconducting coil.

  Conventionally, a technique has been disclosed in which a high magnetic field is generated using a superconducting coil capable of flowing a large current with zero electrical resistance, and artificial vibration is generated by alternately generating a repulsive force or attractive force of the high magnetic field ( (See Patent Document 1 and Non-Patent Document 1).

  The techniques described in Patent Document 1 and Non-Patent Document 1 transmit vibration of electromagnetic force generated in a superconducting coil to the ground surface. Therefore, this technique enables control of the epicenter waveform, improves the reproducibility of the seismic source waveform, and is expected to improve the response without time delay, as compared with the hydraulic vibrator system.

JP 2008-209391 A Atsushi Okano, 4 others, “Artificial seismic source using electromagnetic force generated by superconducting coil”, The Japan Society of Mechanical Engineers, May 2010, 22nd Symposium on “Electromagnetic Force Dynamics”

  In order to generate artificial vibration according to Patent Document 1 and Non-Patent Document 1, it is necessary to transmit the electromagnetic force generated in the superconducting coil to the ground surface while cooling the superconducting coil with a refrigerant (for example, liquid nitrogen).

  However, Patent Document 1 and Non-Patent Document 1 do not specifically describe how the superconducting coil is cooled and how the electromagnetic force generated in the superconducting coil is transmitted to the ground surface.

  The present invention has been proposed in view of such circumstances, and provides a vibration generator that can reliably transmit the electromagnetic force generated in the superconducting coil to the installation surface while cooling the superconducting coil. For the purpose.

  A vibration generator according to the present invention stores a first superconducting coil in a fixed state therein, and stores a refrigerant for cooling the first superconducting coil and maintaining it in a superconducting state. And a first heat-insulating container for storing the first storage container and a second superconducting coil fixed inside, and cooling the second superconducting coil to maintain the superconducting state. The second storage container for storing the refrigerant, the second heat insulating container for storing the second storage container, the first and second superconducting coils are opposed to each other, and the second storage container is placed on the second heat insulating container. With the first heat insulating container disposed, the slide mechanism configured to be slidable in the vertical direction and the first and second superconducting coils repel each other. So that a certain electromagnetic force is generated. A current supply means for supplying a current; a reaction force applying means disposed on an upper portion of the first heat insulating container; and applying a reaction force according to a vibration load in a lower direction of the first heat insulating container; And a vibration transmission part that transmits vibration to the object.

  The vibration generator according to the present invention stores a superconducting coil fixed inside, a storage container for storing a refrigerant for cooling the superconducting coil and maintaining the superconducting state, and a heat insulating material for storing the storage container. In a state where the container, the magnetic force generator for generating magnetic force, the superconducting coil and the magnetic force generator are opposed to each other, and the heat insulating container is disposed above or below the magnetic force generator, the heat insulating container and the magnetic force A slide mechanism configured to be slidable in a vertical direction with respect to the generator, current supply means for supplying a current that generates a predetermined electromagnetic force repelling the magnetic generator to the superconducting coil, and the heat insulating container Or a reaction force applying means that is disposed above the magnetic force generator and applies a reaction force corresponding to a vibration load in a lower direction of the heat insulating container; and provided at a lower portion of the magnetic force generator or the heat insulating container. Is, a, a vibration transmitting section for transmitting the vibration to the object.

  The vibration generator according to the present invention includes a storage container for storing a refrigerant for storing the first and second superconducting coils therein and cooling the first and second superconducting coils to maintain the superconducting state. A heat insulating container for storing the storage container, a slide mechanism configured to be able to slide the second superconducting coil in a vertical direction in the storage container in a state of being opposed to the first superconducting coil, Current supply means for supplying a current that generates a predetermined repulsive electromagnetic force to the first and second superconducting coils, and an upper portion of the heat insulation container, and a vibration load in a lower direction of the heat insulation container. A reaction force applying means for applying a corresponding reaction force; and a vibration transmitting portion that is provided at a lower portion of the slide mechanism and transmits vibration to an object.

  The vibration generator according to the present invention can efficiently transmit vibration due to electromagnetic force generated in the superconducting coil to the installation surface.

It is a figure which shows the structure in XZ plane of the vibration generator which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure in the YZ plane of a vibration generator. It is a figure which shows one form of the current waveform which a power supply device outputs. It is a figure which shows the relationship between the electric current of a high temperature superconducting coil, and a seismic force. It is a figure which shows the high temperature superconducting coil connected in series. It is a figure which shows the other structure of a vibration generator. It is a figure which shows the structure of the vibration generator which concerns on the 2nd Embodiment of this invention. It is a principal part block diagram of the standup pipe periphery provided in the vibration generator. It is a figure which shows the structure of the vibration generator which concerns on the 3rd Embodiment of this invention. It is a figure which shows the structure of the vibration generator which concerns on the 4th Embodiment of this invention. It is a figure which shows a coil pressing board. It is a figure which shows the projection part for coil press board attachment.

  Hereinafter, embodiments of the present invention will be described in detail.

[First Embodiment]
FIG. 1 is a diagram illustrating a configuration in an XZ plane of a vibration generator according to a first embodiment of the present invention. FIG. 2 is a diagram showing a configuration in the YZ plane of the vibration generator.

  The vibration generator includes a storage container 10 for storing the high-temperature superconducting coil C1, a heat insulating container 20 for storing the storage container 10 in a vacuum, a storage container 30 for storing the high-temperature superconducting coil C2, and a storage container 30. And a heat insulating container 40 for storing the inside of the vacuum inside. Further, the vibration generator includes a counterweight 61 that applies a reaction force corresponding to a vibration load from the upper part of the heat insulating container 20, an elastic support mechanism 62 that supports the counterweight 61, and a vibration provided in the lower part of the heat insulating container 40. And a transmission unit 70.

  The high-temperature superconducting coils C1 and C2 are formed in a spiral shape (so-called pancake winding) or solenoid winding, and enter a superconducting state with an electric resistance of zero at minus 196 ° C. (77 [K]).

  The storage container 10 is formed in a cylindrical shape in which both the upper surface 11 and the lower surface 12 are circular so that the high-temperature superconducting coil C1 can be stored. The storage container 10 is filled with, for example, minus 196 ° C. liquid nitrogen, and the high-temperature superconducting coil C1 is cooled by this liquid nitrogen to be in a superconducting state. Projections 200 shown in FIG. 12 are arranged on the lower surface 12 of the storage container 10, and an insulating sheet and polyethylene fiber (Dyneema (registered trademark)) having high thermal conductivity are placed between the coil C1 and the lower surface 12 as an underlay, An insulating sheet or polyethylene fiber is also inserted on the upper surface of the coil C1, and the holding plate 201 shown in FIG. 11 having a large space as shown in FIG. 11 is fastened to the projection 200 with a bolt, and the high-temperature superconducting coil C1 is fixed. The size of the polyethylene fiber on the lower coil surface of the high temperature superconducting coil C1 is preferably larger than the diameter of the high temperature superconducting coil C1. The polyethylene fiber functions as a cushioning material, has an insulating property and high thermal conductivity, and is efficiently cooled from the lower surface of the coil by heat conduction.

  Further, an aluminum nitride material having an insulating property and high thermal conductivity may be used on the upper surface of the high-temperature superconducting coil C1 instead of the polyethylene fiber. Thereby, the cooling performance of the high temperature superconducting coil C1 can be improved.

  As shown in FIG. 1, the storage container 10 has a lead wire drawing tube 13 for drawing out one lead wire 2a of the high temperature superconducting coil C1, and a lead wire drawing out for drawing the other lead wire 2b to the outside. A tube 14 is provided.

  The lead wire 2 a is connected to the current lead 2 that penetrates the lead wire lead tube 13. An external terminal of the lead wire lead-out tube 13 is connected to a separate external power supply. The lead wire 2 b is connected to the current lead 2 that penetrates the lead wire lead-out tube 14. An external terminal of the lead wire lead tube 14 is connected to the lead wire 2d shown in FIG.

  As shown in FIGS. 1 and 2, the lead wire lead-out tubes 13 and 14 are double tubes, and the outside is thermally insulated by vacuum. Lead wires 2a and 2b are connected to the tips of the current leads 2 inserted into the inner tubes of the lead wire lead tubes 13 and 14, respectively. A seal 202 is inserted into the penetrating portion from the storage container 10 to the lead wire extraction pipes 13 and 14, and the seal 202 prevents liquid nitrogen from entering the lead wire extraction pipes 13 and 14 from the storage container 10. The evaporative gas in the upper part of the storage container 10 is introduced into the inner pipe of the lead wire lead pipe 13 from the conduit 203. Gas exhaust pipes 13 a and 14 a are provided at the ends of the lead wire lead pipes 13 and 14. The evaporated gas in the main body of the storage container 10 that has cooled the current lead 2 is exhausted to the outside through the gas exhaust pipes 13a and 14a. Therefore, even if the outer end portion is at room temperature, heat penetration into the current lead 2 is suppressed.

  Further, the storage container 10 includes a liquid nitrogen supply pipe 15 for supplying liquid nitrogen into the storage container 10 as shown in FIG. 2, and an evaporated nitrogen gas exhaust pipe that is a bayonet insertion pipe as shown in FIG. 16 are provided.

  The liquid nitrogen supply pipe 15 supplies liquid nitrogen discharged from the storage container 30 and passing through the liquid nitrogen channel 19 into the storage container 10. Then, the liquid nitrogen stored in the storage container 10 is discharged to the outside through the evaporated nitrogen gas discharge pipe 16 by cooling the heated high-temperature superconducting coil C1 or suppressing heat penetration.

  The heat insulation container 20 is sized to accommodate the storage container 10 in a vacuum, and is formed in a columnar shape having an upper surface 21 and a lower surface 22 that are circular, and the inside is in a vacuum state. The heat insulating container 20 is formed so as to cover the lead wire lead pipes 13 and 14, the liquid nitrogen supply pipe 15, the evaporated nitrogen gas discharge pipe 16, and the liquid nitrogen gas supply pipe 36 together with the main body of the storage container 10. It is insulated from the atmosphere.

  The lower surface 22 of the storage container 10 is integrated with the lower surface 22 in the heat insulation container 20, and the storage container 10 is fixed inside the heat insulation container 20. An annular flange 25 is provided on the outer peripheral portion of the heat insulating container 20.

  A plurality of heat insulating support members 23 are provided in a gap (vacuum layer) between the upper surface 21 of the heat insulating container 20 and the upper surface 11 of the storage container 10. The heat insulating support member 23 supports a compressive force generated between the storage container 10 and the heat insulating container 20, and is inserted between the upper surface 11 of the storage container 10 and the upper surface 21 of the heat insulating container 20.

  The heat insulating support member 23 is formed by connecting two low thermal conductivity materials having different rigidity (for example, a combination of glass epoxy molding material (FRP) and Teflon (registered trademark) (PTFE)) in series. . The heat insulating support member 23 absorbs the dimensional variation between the upper surface 21 of the heat insulating container 20 and the upper surface of the storage container 10, receives the compressive load uniformly, and prevents the heat intrusion from the heat insulating container 20 into the storage container 10. ing.

  The storage container 30 is formed in a cylindrical shape in which both the upper surface 31 and the lower surface 32 are circular so that the high-temperature superconducting coil C2 can be stored. On the upper surface 31 in the storage container 30, the holding plate 201 is fastened to the protrusion 200 with a bolt in the same manner as the high-temperature superconducting coil C 1, and the high-temperature superconducting coil C 2 is fixed. The storage container 30 is filled with, for example, minus 196 ° C. liquid nitrogen, and the high-temperature superconducting coil C2 is cooled by this liquid nitrogen to be in a superconducting state.

  The storage container 30 includes a lead wire drawing tube 33 shown in FIG. 1 which is a tube for drawing one lead wire 2c of the high temperature superconducting coil C2 to the outside, and a tube for drawing the other lead wire 2d to the outside. A lead wire drawing tube 34 shown in FIG. 2 is provided.

  The lead wire 2 c is connected to the current lead 2 that penetrates the lead wire lead tube 33. An external terminal of the lead wire lead tube 33 is connected to the power supply device. The lead wire 2 b is connected to the current lead 2 that penetrates the lead wire lead-out tube 34. An external terminal of the lead wire lead tube 14 is connected to the two lead wires d shown in FIG. The power supply device supplies current to the high-temperature superconducting coils C1 and C2 via the current lead 2 and the lead wires 2a and 2c.

  As shown in FIGS. 1 and 2, the lead wire lead-out tubes 13, 14, 33, and 34 are double tubes, and the outside is thermally insulated by vacuum. Lead wires 2a, 2b, 2c and 2d are connected to the tips of the current leads 2 inserted into the inner tubes of the lead wire lead tubes 13, 14, 33 and 34. A seal 202 is inserted into a penetrating portion from the storage container 30 to the lead wire extraction pipes 33 and 34, and the seal 202 prevents liquid nitrogen from entering the lead wire extraction pipes 33 and 34 from the storage container 30. The evaporative gas in the upper part of the storage container 30 is guided from the conduit 203 into the inner pipes of the lead wire lead pipes 33 and 34. Gas exhaust pipes 33a and 34a are provided at ends of the lead wire lead pipes 33 and 34, respectively. The evaporated gas in the main body of the storage container 10 that has cooled the current lead 2 is exhausted to the outside through the gas exhaust pipes 33a and 34a. Therefore, even if the outer end portion is at room temperature, heat penetration into the current lead 2 is suppressed.

  Further, the storage container 30 includes a liquid nitrogen supply pipe 36 as a bayonet insertion pipe as shown in FIG. 1 and a liquid nitrogen discharge pipe for discharging liquid nitrogen into the storage container 10 as shown in FIG. 37 are provided. Further, as shown in FIG. 2, a degassing elbow 37 a is connected to the inlet of the liquid nitrogen discharge pipe 37 in the storage container 30 and the opening is directed to the upper surface 31 of the storage container 30. Is provided.

  The liquid nitrogen supply pipe 36 supplies liquid nitrogen from an external liquid nitrogen cylinder into the storage container 30. The liquid nitrogen stored in the storage container 30 cools the high temperature superconducting coil C2. The liquid nitrogen discharge pipe 37 shown in FIG. 2 discharges the liquid nitrogen in the storage container 30 and supplies the liquid nitrogen that has passed through the liquid nitrogen channel 19 into the storage container 10.

  Further, when nitrogen gas is generated in the storage container 30 due to heat penetration or heat generation of the high-temperature superconducting coil C2, the nitrogen gas accumulates on the upper surface 31 of the storage container 30. Then, the nitrogen gas is accumulated inside the degassing elbow 37a, is stored in the storage container 10 through the liquid nitrogen discharge pipe 37 and the liquid nitrogen flow path 19, and finally passes through the evaporated nitrogen gas discharge pipe 16. Exhausted to the outside.

  The heat insulating container 40 is sized so that the storage container 30 can be stored inside the vacuum, and the upper surface 41 and the lower surface 42 are formed in a circular column shape, and the inside is in a vacuum state. The heat insulating container 40 is formed so as to cover the lead wire lead pipes 33 and 34, the liquid nitrogen supply pipe 36, and the liquid nitrogen discharge pipe 37 together with the main body of the storage container 30, and insulates the storage container 30 from the atmosphere.

  The upper surface 31 of the storage container 30 is integrated with the upper surface 41 in the heat insulation container 40, and the storage container 30 is fixed inside the heat insulation container 40. A flange 45 is provided on the outer peripheral portion of the heat insulating container 40.

  A plurality of heat insulating support members 43 are provided in the gap (vacuum layer) between the lower surface 42 of the heat insulating container 40 and the lower surface 32 of the storage container 30. The heat insulating support member 43 supports a compressive force generated between the storage container 30 and the heat insulating container 40, and is inserted between the lower surface 32 of the storage container 30 and the lower surface 42 of the heat insulating container 40. The heat insulating support member 43 is made of the same material as the heat insulating support member 23.

  The flange 25 of the heat insulation container 20 and the flange 45 of the heat insulation container 40 are provided with a vertical slide mechanism. Thereby, the heat insulation container 20 and the heat insulation container 40 are relatively prohibited from moving in the horizontal direction, but can be moved in the vertical direction.

  For example, the flange 25 of the heat insulation container 20 and the flange 45 of the heat insulation container 40 are each provided with a plurality of (for example, three or four) contact plates 25a, 45a, and the contact plate 45a is a sleeve that is a cylindrical member. 50 is provided. A shaft 51 is attached to the contact plates 25 a and 45 a in the vertical direction, and a ball bearing is incorporated in the inner periphery of the sleeve 50.

  And the heat insulation container 20 and the heat insulation container 40 are combined so that the shaft 51 may penetrate the sleeve 50 of the contact plate 45a. For this reason, although the heat insulation container 20 and the heat insulation container 40 cannot move relatively to a horizontal direction, they can move to an up-down direction. The flanges 25 and 45 are provided with a stopper mechanism 56 that regulates the range of the gap between the heat insulating container 20 and the heat insulating container 40.

  The flange 25 of the heat insulation container 20 and the flange 45 of the heat insulation container 40 are provided with an annular sealing mechanism (welding bellows) 52 for sealing the gap between the heat insulation container 20 and the heat insulation container 40. The sealing mechanism 52 is formed in a bellows shape that can expand and contract only in the vertical direction. Thereby, even if the heat insulation container 20 and the heat insulation container 40 move to an up-down direction, the clearance gap between the heat insulation container 20 and the heat insulation container 40 is always sealed.

  Helium gas is sealed in the gap between the heat insulating container 20 and the heat insulating container 40. The gas to be enclosed is not limited to helium gas, but may be any gas that has a lower freezing point than the refrigerant (liquid nitrogen) that cools the high-temperature superconducting coil. Thereby, since air | atmosphere is removed from the clearance gap between the heat insulation container 20 and the heat insulation container 40, it can prevent that the humidity in air | atmosphere freezes.

  Moreover, the pressure of helium gas should just be higher than atmospheric pressure, and several kPa or less (for example, 0.1-2 kPa). Thereby, even if helium gas leaks from the sealing mechanism 52, it is possible to prevent air from entering. Further, if the helium gas has such a pressure, the influence on the seismic load is small.

  One port of the gas pipe 53 is provided between the heat insulating container 20 and the heat insulating container 40, and the other port of the gas pipe is connected to an external gas bag 54. And if the heat insulation container 20 and the heat insulation container 40 slide only to an up-down direction, the volume between the heat insulation container 20 and the heat insulation container 40 will change.

  When the volume between the heat insulation container 20 and the heat insulation container 40 decreases, the helium gas between the heat insulation container 20 and the heat insulation container 40 is pushed out to the gas bag 54. When the volume increases, the heat insulation container 20 and the heat insulation container 40 In the meantime, the helium gas of the gas back 54 flows. That is, the gas bag 54 expands or contracts in accordance with a change in volume between the heat insulating container 20 and the heat insulating container 40. Therefore, even if the heat insulation container 20 and the heat insulation container 40 slide in the vertical direction, the space between the heat insulation container 20 and the heat insulation container 40 is always filled with helium gas, and the gap between the heat insulation container 20 and the heat insulation container 40 is frozen. Can be prevented.

  As a reaction force for applying a vibration load to the object, a reaction force (F = mα) is generated by the product of the mass weight of the counterweight 61 and the vertical vibration acceleration, and the acceleration is determined by the vibration frequency and the displacement. The excitation frequency is determined to be about 1 mm or less (the displacement is several μm at 100 Hz). The counterweight 61 is supported by a plurality of elastic support mechanisms 62.

  The elastic support mechanism 62 adjusts the height of the counterweight 61 by combining the screw jack 67 and the air spring 68 up and down. Specifically, the elastic support mechanism 62 includes a plurality of columns 66 that support the counterweight 61 installed on the cradle 61 a, a screw jack 67 that is attached in series to each column 66, and each screw jack 67. And an air spring 68 attached in series.

  The screw jack 67 adjusts the height when the jack nut is turned. The air spring 68 changes its stroke when air or gas is injected from the outside. As a result, the height of the air spring 68 changes, but the natural frequency of the air spring 68 has a characteristic of being substantially constant. In addition, the order of assembly of the support | pillar 62, the screw jack 63, and the air spring 64 is not limited to this structure.

  The vibration transmitting unit 70 includes a spherical seat 71 (convex spherical seat 71a, concave spherical seat 71b) that can slide freely on a spherical surface in a concentric manner according to the inclination of the installation surface of the apparatus, and a load cell 72 that measures vibration pressure. And a pressure plate 73 that applies pressure to the installation surface.

  In the vibration generator configured as described above, the power supply device supplies the following current to the high-temperature superconducting coils C1 and C2.

  FIG. 3 is a diagram illustrating one form of a current waveform output from the power supply device. The power supply device outputs a fluctuating current such as a pseudo-random wave to the high-temperature superconducting coils C1 and C2 in order to fluctuate the electromagnetic force generated in the high-temperature superconducting coils C1 and C2.

  In this case, when an attractive force acts between the high-temperature superconducting coils C1 and C2, the high-temperature superconducting coils C1 and C2 do not vibrate accurately according to the fluctuation current.

  Therefore, the power supply device generates electromagnetic vibrations by supplying a direct current to both of the high-temperature superconducting coils C1 and C2 so that a constant bias degeneration force is always applied, and a fluctuating current is superimposed on the direct current. Let In this case, in order for a repulsive force to always work between the coils, the fluctuation range of the fluctuation current is set to a value smaller than the direct current so that the superimposed current always has a positive value.

  FIG. 4 is a diagram showing the relationship between the current of the high temperature superconducting coil and the seismic force. Here, a case of generating a sinusoidal electromagnetic vibration is shown. The current of the high temperature superconducting coil has a property proportional to the square root of the electromagnetic force generated in the high temperature superconducting coil. Hereinafter, this property will be described.

The electromagnetic force F generated by the opposing high-temperature superconducting coil is a magnetic flux generated by the fluctuating current i flowing in the conductor of one high-temperature superconducting coil and the fluctuating current flowing in the other high-temperature superconducting coil in the conductor portion of the high-temperature superconducting coil. It is proportional to the product of density B. In other words, the following equation holds.
F = k · i · B (k: proportional constant)

The magnetic flux density B generated in the high temperature superconducting coil is proportional to the current i of the high temperature superconducting coil. Therefore, the following equation holds.
B = h · i (h: proportional constant)

Therefore, the electromagnetic force F generated by the high-temperature superconducting coils connected in series is proportional to the square of the current i of the high-temperature superconducting coil. That is, if B is eliminated from the above two expressions, the following expression is established.
F = k · h · i ²

In geophysical exploration, first, the waveform of the seismic force is asked, and the high-temperature superconducting coil must be energized to satisfy it. Therefore, as is apparent from the above equation, the current i that generates the seismic force is given by the following equation.
i = (F / k · h) ^1/2

  When the current flows through the high temperature superconducting coils C1 and C2, the high temperature superconducting coils C1 and C2 generate seismic forces that change in a sine wave shape and repel each other.

  Here, the counterweight 61 is supported by a plurality of elastic support mechanisms 62 including air springs 68 while applying a load to the heat insulating container 20. When a counter-power generation magnetic force that changes in a sine wave shape is generated in the high-temperature superconducting coil C1, the repulsion is transmitted to the counterweight 61 via the storage container 10, the plurality of heat insulating support members 23, and the heat insulating container 20. The counterweight 61 acts as a reaction force (here, a downward force) with respect to the counter power generation magnetic force (here, an upward force) of the high-temperature superconducting coil C1.

  Further, the sinusoidal counter-generated magnetic force generated in the high-temperature superconducting coil C2 is applied to the installation surface (for example, the ground surface) of the present apparatus via the storage container 30, the heat insulating support member 43, the heat insulating container 40, and the vibration transmitting unit 70. It is done.

  As described above, the vibration generator according to the first embodiment cools the high-temperature superconducting coils C1 and C2 in the storage containers 10 and 30 that can be moved independently only in the vertical direction, and also uses the high-temperature superconducting coils C1 and C2. Is transmitted to the storage containers 10 and 30, respectively. And the said vibration generator can transmit the seismic force transmitted to the storage containers 10 and 30 to the installation surface of this apparatus using the vibration transmission part 70 by the reaction force of the counterweight 61. FIG. As a result, the vibration generated by the counter-generated magnetic force of the coil is pushed downward by the upper counter force, so that the vibration electromagnetic force of the coil can be transmitted to the lower ground.

  In this embodiment, the power supply device is connected to the high temperature superconducting coils C1 and C2 in which the winding end of the high temperature superconducting coil C1 and the winding start of the high temperature superconducting coil C2 are connected in series via four lead wires. Current is supplied by two lead wires.

  FIG. 5 is a diagram showing high-temperature superconducting coils C1 and C2 connected in series. As shown in the figure, the high-temperature superconducting coils C1 and C2 are assembled so that one side of the high-temperature superconducting coils C1 and C2 is turned upside down so as to generate a predetermined electromagnetic force that repels each other when energized.

  In order to make it easy to immerse the high-temperature superconducting coils C1, C2 in liquid nitrogen, a concave surface may be formed on the lower surface 12 of the storage container 10 and a convex surface may be formed on the upper surface 31 of the storage container 30.

  FIG. 6 is a diagram illustrating another configuration of the vibration generator. Compared with the vibration generator shown in FIG. 1, this vibration generator is provided with a concave portion on the lower surface 12 of the storage container 10, and a convex surface portion 31 a for evaporating gas accumulation is formed on the upper surface 31 of the storage container 30. Are different.

  Specifically, on the lower surface 12 of the storage container 10, a concave surface portion that is one step lower is formed in a portion where the high temperature superconducting coil C <b> 1 is installed. Note that the lower surface 22 of the heat insulating container 20 is also formed with a concave portion that is one step lower than the lower surface 12 of the storage container 10.

  In addition, on the upper surface 31 of the storage container 30, a raised surface portion is formed on the side where the high temperature superconducting coil C2 facing the high temperature superconducting coil C1 is installed. In addition, the upper surface 41 of the heat insulation container 40 is also formed with a stepped portion that is higher than the upper surface 31 of the storage container 20.

  Thus, when nitrogen gas is generated in the storage container 30, the nitrogen gas is accumulated in the convex surface portion (gas reservoir) 31a on the outer peripheral portion of the high-temperature superconducting coil C2 in the upper surface 31 of the storage container 30. Therefore, the high temperature superconducting coil C2 is always cooled by liquid nitrogen.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the site | part same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  FIG. 7 is a diagram illustrating a configuration of a vibration generator according to the second embodiment. Compared with the vibration generator of the first embodiment, this vibration generator has an inner rising pipe 48 penetrating from the storage container 30 to the storage container 10 and an outer rising pipe 28 rising from the lower surface 12 of the storage container 10. Is different.

  Specifically, as shown in FIG. 8, an inner rising pipe 48 that penetrates the lower surface 12 of the storage container 10 is provided on the upper surface 31 of the storage container 30.

  On the other hand, an outer pipe 28 is provided outside the inner rising pipe 48 on the lower surface 12 of the storage container 10.

  The space between the outer pipe 28 and the inner pipe 48 is the same space as between the lower surface 12 of the storage container 10 and the upper surface 31 of the storage container 30, and the space is filled with helium gas. Therefore, it is necessary to prevent helium gas between the outer rising pipe 28 and the inner rising pipe 48 from leaking into the storage container 10.

  Therefore, as shown in FIG. 8, a donut-shaped lid member 91 is provided at the opening of the inner pipe 48. A circular hole is formed at the center of the lid member 91, and the inside of the inner rising pipe 48 appears from the hole of the lid member 91. A sealing mechanism 92 is provided on the circumferential portion of the lid member 91. The sealing mechanism 92 is formed in a cylindrical shape, and the height direction of the cylinder is formed in a bellows shape. One cylindrical opening of the sealing mechanism 92 is attached to the circumferential part of the lid member 91, and the other cylindrical opening is attached to the opening of the outer rising pipe 28. The height of the lid member 91 is made close to the liquid level of the storage container 10 or protrudes so that the evaporative gas easily escapes together with the liquid nitrogen in the storage container 30.

For this reason, even if the storage container 10 and the storage container 30 vibrate in the vertical direction, the sealing mechanism 92 expands and contracts, so that helium gas between the outer rising pipe 28 and the inner rising pipe 48 does not leak into the storage container 10. It has become.
Therefore, even when nitrogen gas is generated in the storage container 30, the vibration generator according to the second embodiment supplies directly to the storage container 10 through the rising pipe 48 and externally passes through the evaporated nitrogen gas discharge pipe 16. Can be exhausted.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the site | part same as embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  FIG. 9 is a diagram illustrating a configuration of a vibration generating device according to the third embodiment. The vibration generator according to this embodiment uses a permanent magnet PM instead of the high-temperature superconducting coil C2 of the first embodiment.

  The vibration generator includes a storage container 10 for storing the high-temperature superconducting coil C1, an insulating container 20 for storing the storage container 10 in a vacuum, a permanent magnet PM, a counterweight 61, an elastic support mechanism 62a, a permanent And a vibration transmission unit 70 provided below the magnet PM. The elastic support mechanism 62a is the elastic support mechanism 62 in FIG. 1 except for the support 66, but may be the elastic support mechanism 62.

  The storage container 10 is formed in a cylindrical shape in which both the upper surface 11 and the lower surface 12 are circular so that the high-temperature superconducting coil C1 can be stored. In addition, the detailed structure of the storage container 10 and the heat insulation container 20 is the same as that of 1st Embodiment.

  The permanent magnet PM is substantially the same size as the high-temperature superconducting coil C1, and is formed in an annular shape. Further, the permanent magnet PM is attached to the lower side of the circular plate 41 a having the same size as the lower surface 22 of the heat insulating container 20. An annular flange 58 is provided on the outer periphery of the circular plate 41a.

  A vertical slide mechanism is provided on the flange 25 of the heat insulating container 20 and the flange 58 of the permanent magnet PM. And permanent magnet PM is arrange | positioned so as to oppose high temperature superconducting coil C1. Thereby, although the heat transfer container 20 and the permanent magnet PM are relatively prohibited from moving in the horizontal direction, they can move in the vertical direction.

  In addition, the flange 58 is arrange | positioned in the substantially same shape and the same position as the flange 45 of 1st Embodiment. Therefore, the relationship between the flange 58 shown in FIG. 9 and the shaft 51, the sealing mechanism 52, the gas pipe 53, the gas back 54, etc. is the same as the flange 45, the shaft 51, the sealing mechanism 52, the gas pipe 53, and the gas shown in FIG. This is the same as the relationship with the back 54 and the like.

  Further, a vibration transmitting portion 70 is provided below the permanent magnet PM (a surface different from the surface facing the high temperature superconducting coil C1) with the installation plate 59 interposed therebetween.

  When a sinusoidal current as shown in FIG. 3 flows in the high temperature superconducting coil C1, seismic forces that change in a sinusoidal shape and repel each other are generated in the high temperature superconducting coil C1 and the permanent magnet PM.

  Here, the counterweight 61 is supported by a plurality of elastic support mechanisms 62 a including air springs 68 while applying a load to the heat insulating container 20. When a seismic force that changes in a sinusoidal shape is generated in the high-temperature superconducting coil C1, the seismic force is transmitted to the counterweight 61 via the storage container 10, the plurality of heat insulating support members 23, and the heat insulating container 20. . The counterweight 61 acts as a reaction force against the seismic force of the high temperature superconducting coil C1.

  Further, a sinusoidal seismic force generated in the permanent magnet PM is applied to the installation surface (for example, the ground surface) of the present apparatus via the vibration transmission unit 70.

  As described above, the vibration generator according to the third embodiment cools the high-temperature superconducting coil C1 in the storage container 10 and enables the storage container 10 and the permanent magnet PM to move independently in the vertical direction. . Thereby, the vibration generator transmits the seismic force generated in the high-temperature superconducting coil C1 to the storage container 10, and transmits the seismic force generated in the storage container 10 and the permanent magnet PM by the reaction force of the counterweight 61. The unit 70 can be used for transmission to the installation surface of the apparatus.

  In this embodiment, the high-temperature superconducting coil C1 is disposed on the permanent magnet PM. However, the arrangement of the permanent magnet PM and the set of supporting components and the set of the high-temperature superconducting coil C1 and the surroundings of the heat insulating container may be reversed upside down. .

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the site | part same as embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  FIG. 10 is a diagram illustrating a configuration of a vibration generating device according to the fourth embodiment. The vibration generator according to the present embodiment cools the high-temperature superconducting coils C1 and C2 with one storage container 180.

  The vibration generator includes a storage container 180 for storing the high-temperature superconducting coils C1 and C2, a heat insulating container 100 for storing the storage container 180 in a vacuum, a counterweight 61, an elastic support mechanism 62, and a heat insulating container 100. And a vibration transmission unit 70 provided in the lower part.

  The storage container 180 is formed in a cylindrical shape in which both the upper surface 181 and the lower surface 182 are circular so that the high-temperature superconducting coils C1 and C2 can be stored and cooled simultaneously with liquid nitrogen. The high temperature superconducting coil C1 is fixed to the upper surface of a circular intermediate plate 183 having a diameter substantially the same as the diameter of the high temperature superconducting coil C1. The circular intermediate plate 183 is disposed near the middle between the upper surface 181 and the lower surface 182, and the outer edge of the circular intermediate plate 183 is fixed to the inner peripheral portion of the storage container 180. Note that the shape of the circular intermediate plate 183 is not limited as long as the position of the high-temperature superconducting coil C1 is fixed. A plurality of holes are formed in the circular intermediate plate 183, and liquid nitrogen in the heat insulating container 100 is filled on both sides of the circular intermediate plate 183.

  The high temperature superconducting coil C2 is disposed on the lower surface side of the circular intermediate plate 183, and is fixed to a circular plate 185 having a diameter substantially the same as the diameter of the high temperature superconducting coil C2. One end of the coil support shaft 186 is fixed to the center of the lower surface of the circular plate 185 (the surface opposite to the surface on which the high-temperature superconducting coil C2 is located). The coil support shaft 186 passes through the lower surface 182 of the storage container 180 and the heat insulating container 102, and the other end of the coil support shaft 186 is provided with a convex spherical seat via a cradle 189 and a spherical seat receiving plate 75. It is fixed to 71a. Note that all or part of the coil support shaft 186 is made of a material having low thermal conductivity, for example, G10. For this reason, external heat hardly enters the storage container 180 via the coil support shaft 186. In addition, the coil support shaft 186 and the penetrating portion of the heat insulating container 102 have a slide mechanism (not shown) similar to that of the shaft 51 in the sleeve 50 and are movable in the vertical direction although they cannot move in the lateral direction. .

  The coil support shaft 186 is configured to be slidable only in the vertical direction while penetrating the lower surface 182 of the storage container 180 and the lower surface 102 of the heat insulating container 100. Further, a clearance between the penetrating portion of the lower surface 182 inside the storage container 180 and the coil support shaft 186 is covered with a sealing mechanism 187. Further, a clearance between the penetration portion of the lower surface 102 outside the heat insulating container 100 and the coil support shaft 186 is covered with a sealing mechanism 188.

  The sealing mechanisms 187 and 188 are formed in a cylindrical shape, and the height direction of the cylinder is configured in a bellows shape. One cylindrical opening of the sealing mechanism 187 is attached to the outer peripheral portion of the coil support member 190 above the coil support shaft 186. The other cylindrical opening of the sealing mechanism 187 is attached to the outer peripheral portion of the penetrating portion (opening) of the lower surface 182 inside the storage container 180. One cylindrical opening of the sealing mechanism 188 is attached to the lower surface 102 penetrating portion (opening) outside the heat insulating container 100. The other cylindrical opening of the sealing mechanism 187 is attached to a coil support member 189 below the coil support shaft 186.

  The sealing mechanisms 187 and 188 are in a vacuum state surrounded by the heat insulating container 100 and the storage container 180.

  The high temperature superconducting coils C1 and C2 are connected in series by a lead wire 2e. One end of the lead wire 2e is connected to the end of winding of the high temperature superconducting coil C1, and the other end of the lead wire 2e is connected to the beginning of winding of the high temperature superconducting coil C2. Note that the beginning of winding of the high-temperature superconducting coil C1 is connected to the power supply device via the lead wire 2a. The winding end of the high-temperature superconducting coil C2 is connected to the power supply device via the lead wire 2c.

  The storage container 180 has lead wire drawing tubes 13 and 33 for drawing the lead wires 2a and 2c to the outside, a liquid nitrogen supply tube 36 to which liquid nitrogen is supplied from a liquid nitrogen cylinder, and liquid nitrogen and nitrogen. A liquid nitrogen / evaporated gas exhaust port 16 through which gas is exhausted is provided.

  Liquid nitrogen is supplied from the liquid nitrogen cylinder to the storage container 180 through the liquid nitrogen supply pipe 36. The high-temperature superconducting coil C2 is cooled by this liquid nitrogen, and the high-temperature superconducting coil C1 is cooled by liquid nitrogen that has passed through the hole of the circular intermediate plate 183, and each enters a superconducting state. Then, the liquid nitrogen and the nitrogen gas generated in the storage container 180 are discharged to the outside through the liquid nitrogen / evaporated gas exhaust port 16.

  The heat insulating container 100 is sized so that the storage container 180 can be stored inside the vacuum, and the upper surface 101 and the lower surface 102 are formed in a circular column shape, and the inside is in a vacuum state. The heat insulating container 100 is formed so as to cover the main body of the storage container 180, the lead wire extraction pipes 13, 33, the liquid nitrogen / evaporated gas exhaust port 16, and the liquid nitrogen supply pipe 36, and insulates the storage container 180 from the atmosphere. ing.

  A plurality of heat insulating support members 23 are provided in the gap (vacuum layer) between the upper surface 101 of the heat insulating container 100 and the upper surface 181 of the storage container 180. A plurality of heat insulating support members 43 are provided in a gap (vacuum layer) between the lower surface 102 of the heat insulating container 100 and the lower surface 182 of the storage container 180.

  Then, when a square root current of a sine wave as shown in FIG. 2 flows in the high-temperature superconducting coils C1 and C2 connected in series, the seismic force that changes into a sine wave shape and repels each other in the high-temperature superconducting coils C1 and C2. Occurs.

  Here, the counterweight 61 is supported by a plurality of elastic support mechanisms 62 including air springs 68 and has a load such that the vertical displacement is 1 mm or less even at the lowest excitation frequency. Then, when a seismic force repelling each other is generated in the high-temperature superconducting coils C1 and C2, the seismic force is given to the installation surface (for example, the ground surface) of this apparatus via the coil support shaft 186 and the vibration transmitting unit 70. It is done.

  As described above, the vibration generator according to the fourth embodiment cools the high-temperature superconducting coils C1 and C2 in the storage container 180, and the high-temperature superconducting coil C1 and the high-temperature superconducting coil C2 can move only in the vertical direction. ing. Thereby, the said vibration generator can transmit the seismic force which arises in high temperature superconducting coil C1, C2 to the installation surface of this apparatus using the vibration transmission part 70. FIG.

  The above-described embodiments are merely examples, and the present invention is not limited to these embodiments. For example, the high-temperature superconducting coils C1 and C2 facing each other are not limited to a plurality, and a plurality of coil groups are also possible. One of the high-temperature superconducting coils may be a permanent magnet as in the second embodiment, or may be composed of a superconducting bulk body.

  Further, a cooled low temperature superconducting coil may be used instead of the high temperature superconducting coil. In this case, for example, liquid helium may be used instead of liquid nitrogen.

DESCRIPTION OF SYMBOLS 10,30 Storage container 20,40 Thermal insulation container 51 Shaft 61 Counterweight 62 Elastic support mechanism 70 Vibration transmission part C1, C2 High temperature superconducting coil PM Permanent magnet

Claims (3)

A first storage container that stores the first superconducting coil in a state of being fixed inside, and stores a refrigerant for cooling the first superconducting coil and maintaining it in a superconducting state;
A first heat insulating container for storing the first storage container;
A second storage container for storing a refrigerant for storing the second superconducting coil in a fixed state therein, and for cooling the second superconducting coil to maintain the superconducting coil in a superconducting state;
A second heat insulating container for storing the second storage container;
The first and second superconducting coils are opposed to each other, and the first and second heat insulating containers are slid vertically in a state where the first heat insulating container is disposed on the second heat insulating container. A slide mechanism configured to be possible;
Current supply means for supplying current to the first and second superconducting coils so as to generate a predetermined electromagnetic force repelling each other;
A reaction force applying means disposed on an upper portion of the first heat insulating container and applying a reaction force according to a vibration load in a lower direction of the first heat insulating container;
A vibration transmitting portion provided at a lower portion of the second heat insulating container and transmitting vibration to an object;
A vibration generating device. A storage container that stores a refrigerant for storing the superconducting coil in a state of being fixed inside, and cooling the superconducting coil to maintain the superconducting coil in a superconducting state;
A heat insulating container for storing the storage container;
A magnetic force generator that generates magnetic force;
The superconducting coil and the magnetic force generator are opposed to each other, and the heat insulating container and the magnetic force generator are configured to be slidable in the vertical direction in a state where the heat insulating container is disposed on or below the magnetic force generator. A sliding mechanism;
Current supply means for supplying current to the superconducting coil so as to generate a predetermined electromagnetic force repelling the magnetic force generator;
A reaction force applying means disposed on the heat insulating container or the magnetic force generator and applying a reaction force according to a vibration load in a lower direction of the heat insulating container;
A vibration transmission unit that is provided at a lower portion of the magnetic force generator or the heat insulating container, and transmits vibrations to an object;
A vibration generating device. A storage container for storing a refrigerant for storing the first and second superconducting coils therein and cooling and maintaining the first and second superconducting coils in a superconducting state;
A heat insulating container for storing the storage container;
A slide mechanism configured to be able to slide the second superconducting coil in a vertical direction in the storage container in a state of being opposed to the first superconducting coil;
Current supply means for supplying current to the first and second superconducting coils so as to generate a predetermined electromagnetic force repelling each other;
A reaction force applying means disposed at an upper portion of the heat insulating container and applying a reaction force according to a vibration load in a lower direction of the heat insulating container;
A vibration transmission unit provided at a lower portion of the slide mechanism and configured to transmit vibration to an object;
A vibration generating device.