JP2009148709A - Magnetic levitation rotation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic levitation rotation apparatus in which a deterioration in the capability of a refrigerator is prevented even in the case where high-speed stirring is required, regarding a non-contact stirring apparatus comprising the refrigerator unitedly configured with a superconductive bulk body for levitating and rotating stirrer. <P>SOLUTION: The magnetic levitation rotation apparatus comprises a stirrer 1 provided with a stirring blade 2 and configured in a manner of forming an uneven magnetic flux distribution on a concentric circumference with a rotary shaft P, a magnetic polar structural object 5 for levitating and rotating the stirrer 1, and a rotating power source 23 for rotating the magnetic polar structural object 5. The magnetic polar structural object 5 is unitedly composed of a superconductive bulk body 6, a cooling body 7 for cooling the superconductive bulk body 6, a refrigerator 8 for cooling the cooling body 7, and a compressor 9 for compressing and supplying a refrigerant to the refrigerator 8. The compressor 9 comprises a piston 51 reciprocating along the drive shaft P and the drive shaft P of the piston 51 and the rotary shaft P of the magnetic polar structural object 5 are conformed with each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a magnetic levitation rotating device, and in particular, is a field in which foreign matters and impurities are not preferably mixed in the stirring process, and is dangerous in a closed system such as pharmaceuticals, semiconductor resists, printing inks, high pressure or vacuum. The present invention relates to a magnetic levitation rotating device used in a stirring process in fields such as chemical plants and nuclear reaction plants that handle organic solvents and the like.

  Disclosed is a non-contact rotating device in which a stirring unit having a magnetically levitated magnet is disposed in the vicinity of a bulky (bulk) high-temperature superconductor for the purpose of non-contact stirring of an object to be stirred such as liquid or powder. (Patent Document 1). In this non-contact rotating device, a levitating magnet is arranged facing a high-temperature superconductor cooled by a refrigerator. The levitation magnet is levitated and supported by capturing the magnetic field of the levitation magnet with a high-temperature superconductor. On the other hand, a driven magnet is coupled to a magnetically levitated magnet via a rotating shaft, and the driving magnet is arranged apart from the driven magnet. Then, the driven magnet is rotated by a magnetic coupling constituted by the magnetic force of the driven magnet and the driving magnet. With the above configuration, the rotational force is transmitted to the stirring unit without the stirring unit touching the inner wall of the container. Therefore, there is an advantage that impurities are not mixed into the object to be stirred due to frictional wear occurring at the contact portion between the stirring unit and the container.

  However, this non-contact rotating device has a configuration in which the high-temperature superconductor and the drive magnet are arranged opposite to the outside of the container, and the length of the rotating shaft matches the size of the container at the time of manufacture. Must be. Therefore, it is difficult to standardize the manufacturing process of the device, and there is a drawback that the manufacturing cost becomes high. Further, when an attractive force of the magnetic coupling that is stronger than the attractive force of the high-temperature superconductor that magnetically levitates is applied, the levitating distance may fluctuate and contact with the inner wall of the container may occur on the magnetic coupling side. Furthermore, there is a problem that the magnetic coupling is likely to step out and lacks rotational stability.

In order to solve the above problems, a non-contact stirrer that employs a stirrer having both a magnetic levitation function and a magnetic coupling function is disclosed (Patent Document 2). In this non-contact stirrer, a stirrer provided with a stirring blade is composed of a plurality of floating magnets so as to form a non-uniform magnetic flux distribution on a concentric circumference centered on the rotation axis. These levitation magnets are magnetized in a direction parallel to the rotation axis, and adjacent levitation magnets are magnetized in different directions. On the other hand, the magnetic pole composition that floats and rotates the stirrer includes a superconducting bulk body, a thermally insulated non-magnetic container for positioning and fixing the superconducting bulk body, and a cooling body for cooling the superconducting bulk body. And a refrigerator that cools the cooling body. Then, the stirrer is lifted by the magnetic force of the superconducting bulk body constituting the magnetic pole component, and further, the stirrer is rotated by rotating the magnetic pole component around the rotation axis by the rotation drive source. The supply of electric power to the refrigerator is performed through a rotating power supply attached to a part of the refrigerator. A Stirling pulse tube refrigerator is used as the refrigerator.
JP 2000-124030 A JP 2006-122785 A

  A compressor for compressing the refrigerant is connected to the Stirling type pulse tube refrigerator used for the non-contact stirrer. This compressor has a piston that reciprocates along the drive shaft, and the direction of movement of the piston along the lateral drive shaft of the compressor is opposite in synchronization with the two opposing pistons. By setting the orientation, the compression efficiency is improved, and quietness during driving is improved and vibration is reduced. Moreover, since the Stirling type pulse tube refrigerator can be configured to be small and light, it can be suitably used for the non-contact stirrer that needs to rotate the refrigerator.

  However, when high-speed agitation is required, the piston movement along the lateral drive shaft of the compressor is hindered by centrifugal force due to high-speed rotation around the longitudinal rotation axis of the magnetic pole component. As a result, the displacement amount and vibration frequency of the piston are reduced, and the performance of the refrigerator is lowered.

  Therefore, the present invention solves the above problems, and includes a stirrer that has both a magnetic levitation function and a magnetic coupling function, and includes a refrigerator that is integrally formed with a superconducting bulk body that floats and rotates the stirrer. It is an object of the present invention to provide a magnetic levitation rotating device that does not deteriorate the performance of a refrigerator even when high-speed stirring is required in a non-contact stirrer.

  The magnetic levitation rotating device of the present invention includes a stirrer provided with a stirring blade and configured to form a non-uniform magnetic flux distribution on a concentric circumference centering on a rotating shaft, and a magnetic pole that floats and rotates the stirrer And a rotation drive source that rotates the magnetic pole structure around the rotation axis. The magnetic pole structure includes a superconducting bulk body, a cooling body that cools the superconducting bulk body, and a cooling body that cools the cooling body. And a compressor that compresses and supplies refrigerant to the refrigerator, and the magnetic levitation rotating device is integrally formed, and the compressor includes a piston that reciprocates along a drive shaft. The drive shaft of the piston and the rotation axis of the magnetic pole component are made to coincide with each other.

  In addition, a transmission pipe for transmitting the refrigerant from the compressor to the refrigerator is provided, and the transmission pipe is arranged in parallel with the rotation axis of the magnetic pole component.

  In addition, a plurality of the transmission tubes are provided, and the plurality of transmission tubes are arranged at equal intervals on a concentric circle around the rotation axis of the magnetic pole component.

  Further, the magnetic pole component is provided with a balance weight.

  According to the magnetically levitated rotating apparatus of the present invention, the compressor driving shaft of the compressor and the rotating shaft of the magnetic pole component coincide with each other, so that even when the magnetic pole component rotates at a high speed, the compressor is caused by centrifugal force. The movement of the piston is not hindered. Therefore, even when stirring at high speed is required, the performance of the refrigerator does not deteriorate, and stable refrigeration performance can be obtained in all rotation speed regions.

  Further, by arranging the transmission tube in parallel with the rotation axis of the magnetic pole component, the refrigerant moving in the transmission tube is not affected by the centrifugal force, and stable refrigeration performance can be obtained in all rotation speed regions.

  In addition, by arranging a plurality of transmission tubes on a concentric circle centered on the rotation axis of the magnetic pole component at equal intervals, vibrations during high-speed rotation can be eliminated by eliminating weight deviation around the rotation axis due to the weight of the transmission tube. And eccentricity can be prevented.

  Furthermore, by providing a balance weight in the magnetic pole component, it is possible to eliminate the weight deviation around the rotation axis and to prevent vibration and eccentricity during high-speed rotation.

  Hereinafter, embodiments of the magnetically levitated rotating apparatus of the present invention will be described with reference to the accompanying drawings. In addition, this invention is not limited by the following Examples, Various deformation | transformation implementation is possible.

  In FIG. 1 showing the magnetic levitation rotating apparatus of the present embodiment, reference numeral 1 denotes a stirring bar formed in a disk shape, and a plurality of stirring blades 2 are provided on the outer periphery of the stirring bar 1. In addition, a plurality of magnets 3 having the same shape and size are provided at equal intervals on a concentric circumference with the rotation axis P as the center inside the stirring bar 1. The magnet 3 is a permanent magnet, which is magnetized in a direction parallel to the rotation axis P, and the adjacent magnets 3 are magnetized in opposite directions, and each concentric circle about the rotation axis P. It is configured to form a non-uniform magnetic flux distribution on the circumference. Since a plurality of magnets 3 are provided, even when all the magnets 3 are magnetized in the same direction, a non-uniform magnetic flux distribution is formed on each concentric circumference with the rotation axis P as the center. Therefore, all the magnets 3 may be magnetized in the same direction. And the stirring element 1 is accommodated in the container 4 in which to-be-stirred objects, such as a liquid or a powder, are accommodated.

  A magnetic pole component 5 that floats and rotates the stirring bar 1 is provided below the outside of the container 4. The magnetic pole component 5 includes a superconducting bulk body 6, a cooling body 7 that cools the superconducting bulk body 6, a refrigerator 8 that cools the cooling body 7, and a compressor 9 that compresses and supplies refrigerant to the refrigerator. It is constructed integrally.

  The superconducting bulk body 6 is arranged so as to face the lower surface of the stirrer 1 in parallel, and captures the magnetic field distribution by the stirrer 1 stored in advance by the pinning force in a superconducting state, thereby the stirrer 1 is predetermined. It is supposed to be raised to the position.

  The cooling body 7 is integrally formed from a cold head 11 in which a superconducting bulk body 6 is fixed to the upper surface via a magnetic yoke 10, and a heat transfer body 12 connecting the refrigerator 8 and the cold head 11 disposed below the cold head 11. It is configured. The cooling body 7 is formed of a metal material having good heat conductivity and nonmagnetic properties. The superconducting bulk body 6 is cooled by the refrigerator 8 through the heat transfer body 12, the cold head 11, and the magnetic yoke 10.

  The magnetic yoke 10 is formed in a disk shape from a ferromagnetic material having good thermal conductivity. The magnetic yoke 10 is disposed on the opposite side of the stirrer 1 with the superconducting bulk body 6 in between, and is provided to draw the stirrer 1 when positioning the stirrer 1 with respect to the superconducting bulk body 6.

  The superconducting bulk body 6 and the cooling body 7 are fixed in a heat insulating container 14 made of a nonmagnetic material via a heat insulating fixing material 13. Further, the heat insulating container 14 is provided with a vacuum pump port 15 so that the inside of the heat insulating container 14 can be kept in a vacuum, so that the superconducting bulk body 6 and the cooling body 7 are surely attached from the outside of the heat insulating container 14. It is designed to be insulated.

  The refrigerator 8 is a Stirling type pulse tube refrigerator, and a compressor 9 is fixed below the fixing device 16 via a fixture 16. Since the Stirling-type pulse tube refrigerator can be configured to be small and light, it can be suitably used for the magnetic levitation rotating device of the present invention that requires rotating the refrigerator. Further, a transmission pipe 17 that transmits the refrigerant from the compressor 9 to the refrigerator 8 is provided between the refrigerator 8 and the compressor 9.

  The compressor 9 is a voice coil type linear drive compressor, and has a piston 51 that reciprocates along the drive shaft P as shown in FIG. 2, and the piston 51 moves along the drive shaft P. The direction of the two pistons 51 (only one of the upper side is shown in the opposite direction) is opposite to each other in the opposite direction, thereby improving the efficiency of refrigerant compression, improving the quietness during driving, and reducing the vibration. Can be planned.

  Below the compressor 9, a rotary power supply device 19 for supplying power to the compressor 9 is connected via a support component 18. The rotating body power supply device 19 includes a brush portion 20 connected to one end of a cable (not shown) and fixed to a frame (not shown), and a cylindrical rotating portion 21 having an annular wiring with which the brush portion 20 abuts. A rotating drive source 23 is connected to the lower portion of the rotating portion 21 via a rotating shaft 22, and the rotating portion 21 and the rotating shaft 22 are fixed integrally with the magnetic component 5 including the compressor 9. The rotational drive source 23 is constituted by an electric motor and is fixed to the upper surface of the base 24. With this configuration, the magnetic pole component 5 is rotated around the rotation axis P by the rotary drive source 23. Reference numeral 25 denotes a cable for supplying power to the rotational drive source 23.

  The central axis of the magnetic pole component 5 coincides with the rotation axis P, and the rotation axis P coincides with the drive axis P of the piston 51 of the compressor 9. By causing the rotation axis P to coincide with the drive axis P of the piston 51 of the compressor 9, even when the magnetic pole component 5 rotates at a high speed, the movement of the piston 51 of the compressor 9 is not hindered by the centrifugal force. Yes.

  Further, the transmission tube 17 that transmits the refrigerant from the compressor 9 to the refrigerator 8 is arranged in parallel with the rotation axis P of the magnetic pole component 5. With such a configuration, the movement of the refrigerant in the transmission tube 17 is not hindered by the centrifugal force due to the rotation of the magnetic pole component 5.

  Next, the operation will be described.

  First, the magnetic field of the stirrer 1 is stored in the superconducting bulk body 6. The upper surface of the container 14 that is the magnetic pole surface of the magnetic pole component 5 is fixed close to the lower surface of the container 4 below the position where the stirrer 1 is rotated. Next, a spacer (not shown) made of a non-magnetic material is placed on the upper surface of the container 4 below the position where the stirrer 1 is rotated, and the stirrer 1 is placed thereon. At this time, the stirrer 1 is magnetically attracted by the magnetic yoke 10 and is reliably positioned and fixed.

  In this state, power is supplied to the compressor 9 and the refrigerator 8 is operated to cool the superconducting bulk body 6 to 50-60K, and the magnetic flux of the stirrer 1 is captured at the pinning point inside the superconducting bulk body 6. Thus, the magnetic field generated by the stirrer 1 is stored in the superconducting bulk body 6. Since the stirrer 1 is configured to form a non-uniform magnetic flux distribution on each concentric circumference centered on the rotation axis P, the superconducting bulk body 6 captures the pre-stored non-uniform magnetic field. Thus, the stirrer 1 is magnetically levitated and forms a magnetic coupling with the stirrer 1.

  While maintaining this state, the spacer is taken out from under the stirring bar 1 and the object to be stirred is put into the container 4. When the rotary drive source 23 is driven, the magnetic pole component 5 including the superconducting bulk body 6 rotates, and the stirrer 1 rotates integrally with the magnetic pole component 5 in the same cycle following this rotation. Since the stirrer 1 is supported by the superconducting bulk body 6 with a strong magnetic coupling, the rotation of the stirrer 1 supported without contact does not step out.

  At this time, the stirring bar 1 and the magnetic pole component 5 rotate around the rotation axis P. Since the rotation axis P and the drive axis P of the piston 51 of the compressor 9 coincide with each other, even when the magnetic pole component 5 rotates at a high speed, the movement of the piston 51 of the compressor 9 is hindered by the centrifugal force. Absent. Further, since the transmission tube 17 is disposed in parallel with the rotation axis P of the magnetic pole component 5, the movement of the refrigerant in the transmission tube 17 is not hindered by the centrifugal force due to the rotation of the magnetic pole component 5.

  As described above, the magnetically levitated rotating apparatus of the present embodiment includes the stirring bar 1 provided with the stirring blade 2 and configured to form a non-uniform magnetic flux distribution on the concentric circumference around the rotation axis P. A magnetic pole component 5 that floats and rotates the stirrer 1 and a rotation drive source 23 that rotates the magnetic pole component 5 around the rotation axis P. The magnetic pole component 5 includes a superconducting bulk body 6, A magnetic levitation rotation integrally configured from a cooling body 7 that cools the superconducting bulk body 6, a refrigerator 8 that cools the cooling body 7, and a compressor 9 that compresses and supplies refrigerant to the refrigerator 8. The compressor 9 has a piston 51 that reciprocates along a drive shaft P, and the drive shaft P of the piston 51 and the rotation shaft P of the magnetic pole component 5 are matched. is there.

  According to the magnetically levitated rotating apparatus of the present embodiment, when the driving shaft P of the piston 51 of the compressor 9 and the rotating shaft P of the magnetic pole component 5 are matched, the magnetic pole component 5 is rotated at a high speed. However, the movement of the piston 51 of the compressor 9 is not hindered by the centrifugal force. Therefore, even when stirring at high speed is required, the performance of the refrigerator 8 does not deteriorate, and stable refrigeration performance can be obtained in all rotation speed regions.

  Further, a transmission pipe 17 for transmitting the refrigerant from the compressor 9 to the refrigerator 8 is provided, and the transmission pipe 17 is arranged in parallel with the rotation axis P of the magnetic pole component 5. By arranging the transmission tube 17 in parallel with the rotation axis P of the magnetic pole component 5, the refrigerant moving in the transmission tube 17 is not affected by the centrifugal force, and stable refrigeration performance is achieved in all rotation speed regions. can get.

  In the present embodiment, a single superconducting bulk body 6 is used. Instead, as shown in FIG. 3, the magnet 3 and the magnet 3 are provided in correspondence with the plurality of magnets 3 provided in the stirrer 1. The same number of small superconducting bulk bodies 6 a may be disposed on the magnetic yoke 10. With this configuration, the number of superconducting bulk bodies 6a is plural. However, since the volume of the superconducting bulk body 6a can be reduced as a whole, the weight can be reduced and the manufacturing cost can be reduced. In this case, the magnetic flux of each corresponding magnet 3 is captured by each superconducting bulk body 6a.

  In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 4, in this embodiment, a transmission tube 17 a having the same shape as that of the transmission tube 17 is added at a symmetrical position with respect to the rotation axis P of the transmission tube 17. That is, the plurality of transmission tubes 17 and 17 a are arranged at equal intervals on a concentric circle with the rotation axis P of the magnetic pole component 5 as the center. By arranging the transmission tubes 17 and 17a in this way, and maintaining the equilibrium by canceling the centrifugal force generated by the transmission tube 17 when the magnetic pole component 5 is rotated by the centrifugal force generated by the transmission tube 17a, the magnetic pole component 5 is operated at high speed. Vibration and eccentricity when rotating can be prevented, and the magnetic pole component 5 can be rotated stably.

  In this embodiment, there are two transmission tubes 17 and 17a, but three or more may be used. In this case, by arranging the plurality of transmission tubes on a concentric circle with the rotation axis P of the magnetic pole component 5 as the center, the influence of the centrifugal force of the transmission tube can be canceled out mutually.

  As described above, the magnetically levitated rotating apparatus according to the present embodiment includes a plurality of transmission tubes 17 and the plurality of transmission tubes 17 and 17a are evenly arranged on a concentric circle around the rotation axis P of the magnetic pole component 5. Since they are arranged at intervals, it is possible to eliminate the deviation of the weight around the rotation axis P due to the weight of the transmission tube 17, and to prevent vibration and eccentricity during high-speed rotation.

  As shown in FIG. 5, the present embodiment is provided with a balance weight 26 for balancing the centrifugal force of the transmission tube 17 when the magnetic pole component 5 rotates. By canceling the centrifugal force generated by the transmission tube 17 when the magnetic pole component 5 rotates with the centrifugal force generated by the balance weight 26 and maintaining equilibrium, vibration and eccentricity when the magnetic pole component 5 rotates at high speed are prevented and stable. Thus, the magnetic pole component 5 can be rotated.

  As described above, the magnetically levitated rotating apparatus of this embodiment is provided with the balance weight 26 in the magnetic pole component 5, eliminates the weight deviation around the rotation axis P, and is free from vibration and eccentricity during high-speed rotation. Can be prevented.

It is a schematic diagram which shows the whole structure in Example 1 of this invention. It is sectional drawing which shows the vicinity of one piston of the compressor in Example 1 of this invention. It is a schematic diagram which shows a part of superconducting bulk body vicinity in the modification of Example 1 of this invention. It is a schematic diagram which shows the magnetic pole structure in Example 2 of this invention. It is a schematic diagram which shows the magnetic pole structure in Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stirrer 2 Stirring blade 5 Magnetic pole component 6 Superconducting bulk body 7 Cooling body 8 Refrigerator 9 Compressor
17, 17a Transmission tube
23 Rotation drive source
26 Balance weight
51 Piston P Rotation shaft, drive shaft

Claims (4)

A stirrer provided with a stirring blade and configured to form a non-uniform magnetic flux distribution on a concentric circumference centering on the rotation axis, a magnetic pole component that floats and rotates the stirrer, and a magnetic pole component A rotation drive source that rotates around a rotation axis, and the magnetic pole component includes a superconducting bulk body, a cooling body that cools the superconducting bulk body, a refrigerator that cools the cooling body, and the refrigerator. A magnetic levitation rotating device integrally configured with a compressor that compresses and supplies refrigerant, the compressor having a piston that reciprocates along a drive shaft, and the drive shaft of the piston and the magnetic pole A magnetic levitation rotating device characterized in that the rotating shaft of a component is made to coincide. 2. The magnetically levitated rotating apparatus according to claim 1, further comprising a transmission tube that transmits the refrigerant from the compressor to the refrigerator, and the transmission tube is disposed in parallel with a rotation axis of the magnetic pole component. 3. The magnetically levitated rotating apparatus according to claim 2, wherein a plurality of the transmission tubes are provided, and the plurality of transmission tubes are arranged at equal intervals on a concentric circle centered on the rotation axis of the magnetic pole component. The magnetic levitation rotating apparatus according to claim 2 or 3, wherein a balance weight is provided on the magnetic pole component.

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