WO2009119176A1 - ロータリジョイント - Google Patents
ロータリジョイント Download PDFInfo
- Publication number
- WO2009119176A1 WO2009119176A1 PCT/JP2009/052392 JP2009052392W WO2009119176A1 WO 2009119176 A1 WO2009119176 A1 WO 2009119176A1 JP 2009052392 W JP2009052392 W JP 2009052392W WO 2009119176 A1 WO2009119176 A1 WO 2009119176A1
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- WIPO (PCT)
- Prior art keywords
- vacuum
- fluid
- passage
- fluid passage
- seal
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3464—Mounting of the seal
- F16J15/348—Pre-assembled seals, e.g. cartridge seals
- F16J15/3484—Tandem seals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
- F16L27/087—Joints with radial fluid passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
- F16L39/04—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies allowing adjustment or movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
- F16L59/18—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints
- F16L59/185—Adjustable joints, joints allowing movement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/124—Sealing of shafts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K55/00—Dynamo-electric machines having windings operating at cryogenic temperatures
- H02K55/02—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type
- H02K55/04—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type with rotating field windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K55/00—Dynamo-electric machines having windings operating at cryogenic temperatures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Definitions
- the present invention relates to a rotary joint with a mechanical seal device provided in the middle of a refrigerant fluid passage in order to cool a cooling part such as a superconducting field coil of a superconducting motor with a refrigerant. More specifically, the present invention relates to a rotary joint with a mechanical seal device capable of introducing a supplied refrigerant at a very low temperature from a fixed refrigerator to a rotating cooling unit through a relative rotating unit.
- a superconducting device such as a superconducting motor must supply a cryogenic refrigerant such as liquid nitrogen or liquid helium to a cooling unit such as a superconducting field coil in order to maintain the superconducting state of the superconducting field coil.
- a cryogenic refrigerant such as liquid nitrogen or liquid helium
- the refrigerant after being used in the cooling section must be collected in the refrigerator. At this time, it is necessary to maintain the temperature of the supplied refrigerant (referred to as supplied refrigerant) at an extremely low temperature and reduce the amount of expensive supplied refrigerant used.
- the sealing device that seals the fluid passage of the communication passage that rotates relative to the fluid passage of the fixed portion and the fluid passage of the rotating portion uses a refrigerant to seal the supply refrigerant or the exhaust refrigerant at an extremely low temperature.
- the ability to seal becomes a problem with temperature.
- the temperature of the supply refrigerant rises, unless the supply amount of the supply refrigerant is increased, cooling cannot be performed to a predetermined temperature, so that the superconducting function cannot be exhibited. For this reason, there exists a problem which the usage-amount of the supply refrigerant
- FIG. 9 of Japanese Patent Application Publication No. 2003-65477 (Patent Document 1) (the illustration of FIG. 9 is omitted, but the reference numeral of the drawing of Patent Document 1 is shown after the part name) is “Superconducting coil”.
- the insertion tube 154 on the fixed side is configured as a non-contact seal by fitting the distal end portion 158 to the inner peripheral surface of the inlet tube 156 in a non-contact state.
- the insertion tube 154 is simply fitted to the inner peripheral surface of the inlet tube 156 in a non-contact state. Accordingly, when the inlet cryogenic gas 157 supplied from the cryogenic cooler 90 flows through the insertion tube 154 and flows into the inlet tube 156, a part of the inlet cryogenic gas 157 is inserted into the insertion tube 154 and the inlet tube 156. There is a risk of flowing into the cylindrical housing 186 from a gap fitted in a non-contact manner.
- the inside of the cylindrical housing 186 is maintained in a vacuum state, if the inlet cryogenic gas 157 flows into the cylindrical housing 186, the degree of vacuum in the cylindrical housing 186 is reduced, so that the heat insulating effect by the vacuum is reduced. .
- cryogenic agent transfer joint 26 is configured such that the high temperature cooling gas 164 flows through the annular space between the outer periphery of the cooling inlet tube 156 through which the inlet cryogenic gas 157 flows and the cooling outlet tube 166, the cooling inlet tube 156.
- the temperature of the inlet cryogenic gas 157 flowing through the inside may increase due to the high temperature cooling gas 164.
- the motion gap seal 162 disposed in the cylindrical casing 168 is deteriorated in material due to the cryogenic temperature because the inlet cryogenic gas 157 flows on the inner peripheral side and the high temperature cooling gas 164 flows on the outer peripheral side. As a result, the sealing ability may be reduced.
- the magnetic fluid seal 176 mounted in the cylindrical housing 196 is described as preventing leakage of the return gas 164 (see paragraph number 0046), its configuration is unknown.
- the magnetic fluid seal 176 when the inside of the cylindrical housing 186 is evacuated, the magnetic fluid is sucked into the cylindrical housing 186 and the sealing performance of the magnetic fluid seal 176 is reduced. For this reason, the external air flow 177 enters the cylindrical housing 186 through the magnetic fluid seal 176, so that the degree of vacuum in the cylindrical housing 186 decreases.
- the degree of vacuum in the cylindrical housing 186 decreases, the heat insulating effect of the inlet cryogenic gas 157 cannot be obtained. It is difficult to maintain this high vacuum with a normal magnetic fluid seal.
- the sliding surface is evacuated and the lubricating liquid on the sliding surface is sucked, so that the sealing surface is worn.
- the air flow 177 or even the return gas gradually enters the cylindrical housing 186 through the seal surfaces, making it difficult to maintain the cooling fluid at a cryogenic temperature of 30 ° K or lower.
- the inlet cryogenic gas 157 cannot be maintained below 30 ° K, the superconducting effect of the superconducting coil (coil winding 34) cannot be exhibited.
- the flow rate of the inlet cryogenic gas 157 more than necessary must be supplied to the superconducting coil side. In this current situation, since the cooling fluid such as helium is expensive, the running cost of the synchronous generator is increased.
- FIG. 1 or FIG. 3 of Japanese Patent No. 3306452 (Patent Document 2) (not shown, but the reference numeral of the drawing of Patent Document 2 is shown in parentheses after the part name) 1 is a sectional view in which the liquid helium injection pipe (1) is inserted into the inner peripheral surface of the overhanging portion (10) covered with the vacuum layer (2). A gap is formed between the inner peripheral surface of the inserted overhanging portion (10) and the outer peripheral surface of the liquid helium injection pipe (1). This is a configuration in which liquid helium is leaked to the outside by a seal (4) that blocks the outer peripheral gap communicating with the gap.
- the inlet tube 156 is fitted to the fixed insertion tube 154.
- the liquid helium injection pipe (1) is connected to the projecting portion (10) at the rotor tip.
- the protruding portion (10) at the tip of the child comes into contact with the relative surface, it may slide with the fixed insertion tube 154 or the liquid helium injection pipe (1) to generate wear powder.
- the rotor must be complicated according to the number, and the structure of the sealing device is complicated. To.
- the present invention has been made in view of the above-described problems, and its problem is to insulate the fluid passage through which the supply refrigerant flows in a high vacuum state and supply the cryogenic supply refrigerant to the cooling unit. It is in. Furthermore, the high vacuum insulation prevents the sealing ability of the second mechanical seal device communicating from the stationary fluid passage to the rotating fluid passage from being lowered by the supplied refrigerant. Another object of the present invention is to improve the efficiency of the configuration of the fluid passage communicating with the stationary fluid passage connected to the refrigerator and the connecting fluid passage on the relatively rotating side. Furthermore, it is in improving the durability of the rotary joint which distribute
- coolant. Another object of the present invention is to facilitate the assembly of the piping by the structure of the connecting fluid passage to facilitate the manufacture of the fluid passage. Another object is to improve the cooling effect of the refrigerant and reduce the running cost of the refrigerant.
- the rotary joint of the present invention is a rotary joint for refrigerant that connects between the fluid passages of the stationary-side refrigerant supply device and the rotating-side cooling unit, and is rotatably supported by the main body and penetrates in the axial direction.
- a connecting portion having a vacuum passage and allowing one end of the vacuum passage to communicate with the communication passage of the cooling portion; an opening portion of a vacuum reference at the other end of the vacuum passage; and the connecting portion and the opening portion.
- a vacuum cylinder shaft having a connection portion in the middle, a rotary seal ring that is hermetically fitted to the connection portion of the vacuum cylinder shaft and has seal surfaces on both end faces, and is disposed on both axial sides of the rotary seal ring
- Both fixed sealing rings having opposing sealing surfaces that are in close contact with the opposing sealing surfaces, and a coupling portion at one end is hermetically coupled to a peripheral surface opposite to the opposing sealing surface of each stationary sealing ring, and a fixing portion at the other end
- a first fluid that is formed between an elastic bellows that is fixedly sealed to the main body and elastically presses the fixed sealing ring against the sealing surface, and that is formed between the elastic bellows on both sides of the rotary sealing ring, and introduces a supply refrigerant.
- a connecting fluid passage communicating with the fluid passage and having a connecting hole at the other end, one end connected to the connecting hole to communicate with the connecting fluid passage, and the other end communicated with the flow passage on the cooling unit side A first pipe disposed in the vacuum passage of the vacuum cylinder shaft, a connection cover having a suction port for vacuum suction from the opening of the vacuum cylinder shaft, and the connection; Combined with cover and seal A magnetic fluid sealing cover that surrounds the vacuum cylinder shaft, and is fitted in parallel to one peripheral surface between the inner peripheral surface of the magnetic fluid sealing cover and the outer peripheral surface of the vacuum cylindrical shaft and in parallel.
- the magnetic fluid having a shaft cover that is hermetically fitted to the other peripheral surface, and a magnetic fluid interposed between the protrusion and the pole block, and receiving a magnetic force against the vacuum suction force
- a magnetic fluid sealing device for blocking between the protrusion and the pole block.
- the inside of the inner peripheral surface of the vacuum cylinder shaft can be brought into a high vacuum state by the magnetic fluid sealing device capable of reliably sealing against vacuum suction, and the heat insulation effect can be exhibited.
- the magnetic fluid seal device since the magnetic fluid seal device has no sliding surface that slides, it can effectively prevent the sliding surface from being worn at an early stage and can exhibit durability. For this reason, a high vacuum (10 ⁇ 5 Torr or less) state can be maintained for a long time in the inner peripheral surface of the vacuum cylinder shaft (note that the sealing surface of the conventional sealing device has an excellent sealing ability. Since the lubricant on the sealing surface that slides in a vacuum state is sucked off, it wears out early.
- the connecting portion of the vacuum cylinder shaft is connected to the connecting portion of the cooling portion and communicates with the inside of the cooling portion, the inside of the cooling portion can also be thermally insulated by this vacuum suction. Accordingly, the first piping and the second piping arranged in the inner peripheral surface of the vacuum cylinder shaft and the connection portion can be effectively thermally insulated from the outside air, so that the supplied refrigerant is kept at an extremely low temperature. it can. Further, the vacuum heat insulation in the inner peripheral surface of the vacuum cylinder shaft can maintain the supplied refrigerant in a liquid state by maintaining the supplied refrigerant flowing in the interval fluid passage at an extremely low temperature.
- the configuration of the elastic bellows integrated with the fixed seal ring eliminates the need for an O-ring that seals between the sliding surfaces of the fixed seal ring that slide, so that the refrigerant is changed as the O-ring material changes due to extremely low temperatures. Leakage can be prevented.
- the structure of the elastic bellows is that the opposing sealing surface of the stationary sealing ring is elastically pressed against the sealing surface even in a cryogenic state, and there is no sliding surface for the movement for this elastic sealing. The surface sealing ability can be demonstrated.
- each 1st piping and 2nd piping are comprised from the piping instead of the fluid passage of the hole which processed the member used as the cylinder shaft for vacuum with the drill etc., the pipe material excellent in the heat insulation effect is selected. be able to.
- each 1st piping and 2nd piping are piping, while processing and assembly of 1st piping and 2nd piping become easy, piping work also becomes easy, the processing cost as a fluid passage, and assembly Cost can be reduced.
- At least two pairs of the rotary seal ring and the fixed seal rings on both sides are arranged in the axial direction and adjacent to the one set of the fixed seal rings.
- a second gap fluid passage is provided between the other set of the fixed sealing rings facing each other, and the second gap fluid passage communicates with a second pipe disposed in the vacuum passage of the vacuum cylinder shaft. The discharged refrigerant that has cooled the cooling section is returned through the second pipe and the second interval fluid passage.
- the second pipe is arranged in the inner peripheral surface of the vacuum cylinder shaft and is vacuum-insulated, so that the discharged refrigerant can maintain an extremely low temperature.
- coolant flows through a 2nd space
- the connecting portion is formed such that the inner peripheral surface is a circular surface or an elliptical surface, or an uneven surface or a gear-shaped surface along the circumferential direction.
- the connection hole is formed in the above.
- the rotary joint of the present invention having such a configuration, various shapes such as a circular shape, an elliptical shape, and an uneven shape are provided on the inner peripheral surface of the connecting portion provided in the mechanical seal device of the vacuum cylinder shaft.
- the number of the second pipes can be increased by providing the second pipe on the side surface projecting to the inner diameter side.
- this configuration facilitates attachment of the first pipe and the second pipe.
- the shape of the internal peripheral surface of a connection part can make vacuum suction easy, and can exhibit the effect of the vacuum insulation of a vacuum channel
- the arrangement of the connection holes in the connection portion can be facilitated according to the number of the first pipes and the second pipes.
- the rotary sealing ring has a plurality of the second fluid passages arranged along the circumferential direction, and the connection portion also includes the second fluid passages along the circumferential direction.
- the connection fluid passage communicates with the fluid passage, and the fluid passages of the first pipes communicate with the corresponding connection fluid passages.
- the rotary joint having such a configuration a large number of second fluid passages can be provided in the rotary seal ring. Therefore, a plurality of supply refrigerants flowing from one first fluid passage can pass through the first interval fluid passage. In the second fluid passage. Since the fluid passages of the first pipes communicate with the plurality of connection fluid passages communicating with the plurality of second fluid passages, it is possible to supply as much supply refrigerant as necessary to the required portions of the respective cooling units. become. Further, the number of the pair of second mechanical seals composed of the fixed sealing ring and the rotating sealing ring can be reduced. At the same time, the axial length of the connecting portion can be shortened. As a result, the production cost and assembly cost of the second mechanical seal device and the connecting parts can be greatly reduced. Also, the rotary joint can be made small.
- FIG. 1 is a cross-sectional view of one side of a rotary joint according to a first embodiment of the present invention.
- FIG. 2 is an enlarged cross-sectional view of the first assembly showing the vicinity of the mechanical seal device and piping of FIG.
- FIG. 3 is an enlarged cross-sectional view showing a configuration in the vicinity of each second mechanical seal device of FIG. 4 is a cross-sectional view of one side of the second assembly of FIG.
- FIG. 5 is a cross-sectional view of one side of the third assembly of FIG.
- FIG. 6 is an enlarged cross-sectional view of one side of the magnetic fluid seal shown in FIG.
- FIG. 7 is a front view in the axial direction of the connecting portion according to the second embodiment of the present invention.
- FIG. 8 is an axial front view of the rotary seal ring according to the third embodiment of the present invention.
- FIG. 9 is a schematic sectional view of a superconducting motor to which a rotary joint according to the present invention is attached.
- FIG. 1 is a cross-sectional view of one side of a rotary joint R according to a first embodiment of the present invention.
- the hatching is omitted because the figure becomes unclear when hatching is added to the cross section.
- FIG. 2 is an enlarged cross-sectional view of one side of the first assembly A, showing the mechanical seal device 1 of FIG.
- FIG. 3 is a further enlarged sectional view showing a configuration in the vicinity of the second mechanical seal device 1 of FIG.
- FIG. 4 is an enlarged cross-sectional view of one side of the second assembly B on the first bearing portion 60D1 side.
- FIG. 5 is an enlarged cross-sectional view of one side of the third assembly C on the magnetic fluid seal 40 side.
- FIG. 6 is an enlarged cross-sectional view of the magnetic fluid seal 40 shown in FIG.
- the rotary joint R of the present invention will be described below with reference to FIGS.
- the joint portion 10C with the flange of the rotary joint R is a synchronous rotary machine having a field coil, for example, a rotary shaft with a fluid passage such as a rotary generator or a linear motor, and a fluid passage of the superconducting motor 100 shown in FIG. It connects with the attached rotating shaft 115.
- a field coil for example, a rotary shaft with a fluid passage such as a rotary generator or a linear motor, and a fluid passage of the superconducting motor 100 shown in FIG. It connects with the attached rotating shaft 115.
- the superconducting motor 100 of FIG. 9 connected to the rotary joint R of FIG. 1 will be described.
- the superconducting motor 100 which is not the present invention will be briefly described.
- the superconducting motor 100 shown in FIG. 9 is a schematic diagram.
- Three rotors 110 are fitted on the outer peripheral surface of the rotating shaft 115 which is cylindrical and provided with the inner peripheral surface 115A (the reference numeral is only one place).
- On both sides of the rotor 110 a total of four stators 106 (only one symbol is arranged) are arranged in the axial direction.
- Each rotor 110 is provided with a cooling unit 105 having a space on the inner peripheral side of the superconducting (SC) coil 103.
- the cooling section 105 is provided with first pipes 101, 101, 101 that can communicate with the first pipes 20E of the rotary joint R and supply a refrigerant.
- the refrigerant is supplied to the respective cooling units 105, 105, 105 through the first tubes 101, 101, 101 to cool the superconducting coils 103, 103, 103 (only one symbol is provided).
- the refrigerant after cooling each superconducting coil 103, 103, 103 passes through a second pipe 20 ⁇ / b> E communicating with the respective second pipes 102, 102, 102 for discharge fluid passages, and a refrigerant supply device (refrigeration not shown) is provided. (Also called machine).
- Bearings 116 and 116 are provided on both sides of the rotating shaft 115. For convenience, the case where there are three rotors 110 has been described.
- the number of rotors 110 is not limited to three, and there may be one, two, or three or more. Further, there is a structure different from the illustrated structure of the rotor 110. However, in any case, in order to bring the electric resistance of the superconducting coil close to zero (0) in the synchronous rotating mechanism, the superconducting coil must be cooled to a cryogenic temperature state. The present invention solves this problem.
- the rotary joint R of the present invention is configured such that the cryogenic supply refrigerant Q1 can be directly supplied from the stationary side to the cooling units 105 through the connecting fluid passages 20D and 20D on the rotating side.
- the supply refrigerant Q1 or the discharge refrigerant Q2 is disposed in the vacuum passage 10H in a high vacuum state (high vacuum is in the range of 10 ⁇ 3 Torr to 10 ⁇ 7 Torr).
- the supply refrigerant Q1 can be maintained at an extremely low temperature equal to or lower than the critical temperature by being thermally insulated from the outside air by vacuum. And the 1st piping 20E and the 2nd piping 20E are maintained in the state of a high vacuum, and it blocks
- the connecting portion 10 ⁇ / b> C of the vacuum cylinder shaft 10 is formed so as to be connected to an attachment portion at one end of the rotating shaft 115 of the superconducting motor 100 so as to rotate together.
- the first pipe 20 ⁇ / b> E is connected to the first pipe 101 and is provided with a supply fluid passage that allows the supply refrigerant Q ⁇ b> 1 from the first pipe 20 ⁇ / b> E to be supplied into the first pipe 101.
- the second pipe 20E is also a discharge fluid passage that is connected to the second pipe 102 to allow the used exhaust refrigerant Q2 that has cooled the superconducting coil and the like to be discharged from the second pipe 101 to the second pipe 20E.
- the first pipe 20E is not limited to the supply fluid passage for the supply refrigerant Q1, and the second pipe 20E is not limited to the discharge fluid path for the discharge refrigerant Q2.
- the first pipe 20E can also be used for the exhaust fluid passage.
- the second pipe 20E can be selected as a supply fluid passage.
- the vacuum tube shaft 10 is connected to the first vacuum tube shaft 10A made entirely of stainless steel (also referred to as a connection component.
- the connection component does not mean a separate component from the vacuum tube shaft) 10A1 and (2)
- a joint portion (reference numeral 10B) of the vacuum cylinder shaft 10B is joined, and a bolt (not shown) is screwed in the axial direction to be connected.
- the first vacuum cylinder shaft 10A is integrally formed by fitting the end portion of the cylinder shaft and the stepped surface of the connecting portion 10A1, and welding the peripheral surface of the fitting portion.
- the second vacuum cylinder shaft 10B is welded between the fitting surfaces by fitting the end of the cylinder shaft and the stepped surface of the joint portion 10B.
- the welded joint portion 10B and the connection portion 10A1 are fitted together and fastened with bolts to form a cylinder.
- the connection between the first vacuum cylinder shaft 10A and the second vacuum cylinder shaft 10B is fastened with a bolt so that the second mechanical seal device 1 can be attached.
- the first vacuum cylinder shaft 10A and the first The two vacuum cylinder shafts 10B can be integrated without being divided and assembled.
- the connecting portion 10A1 is integrally fitted to the inner peripheral surface of the first vacuum cylinder shaft 10A.
- the first vacuum cylinder shaft 10A may be processed and formed in the connection portion 10A1.
- the second mechanical seal refers to a rotary seal ring 1A and a combination of a pair of fixed seal rings 2A and 2A arranged on both sides of the rotary seal ring 1A. And the whole which combined two or more 2nd mechanical seals is called the mechanical seal apparatus 1.
- the connecting portion 10A1 has L-shaped connecting fluid passages 20D having a cross section radially and axially arranged in the inside thereof in a set number along the circumferential direction while changing the position in the axial direction.
- the opening on the end side in the axial direction of each of the connection fluid passages 20D and 20D is formed in the connection hole 20D1, and the end portions of the first pipe 20E and the second pipe 20E are hermetically fitted in the connection holes 20D1, respectively. (Seal by welding or bonding between the fitted peripheral surfaces).
- the first pipe 20E and the second pipe 20E having the supply or discharge fluid passages are arranged in the inner peripheral surface 10A2 of the first vacuum cylinder shaft 10A to allow the extremely low temperature refrigerants Q1 and Q2 to flow. .
- the first pipe 20E and the second pipe 20E arranged in the inner peripheral surface 10A2 of the first vacuum cylinder shaft 10A are arranged in a high vacuum that is vacuumed (evacuated) and insulated from the outside by vacuum.
- the first pipe 20E and the second pipe 20E are made of stainless steel pipe, copper pipe, aluminum pipe, boron nitride, quartz pipe, tempered glass pipe, low-temperature resin (PTFE or the like) pipe, or the like.
- the outer periphery of the stainless steel tube is covered with a material that can be insulated by using a material such as PTFE, glass, quartz, or the like.
- FIGS. 2 and 3 are enlarged views of the first assembly A shown in FIG.
- the inner peripheral surface 1A3 of the rotary seal ring 1A is arranged in two rows on the outer peripheral surface of the connecting portion 10A1 of the vacuum cylinder shaft 10 so as to be axially spaced.
- the rotary seal ring 1A is assembled by sandwiching the cylindrical spacer 12 between the two rotary seal rings 1A and 1A arranged in parallel, and connecting the outer end in the axial direction of the rotary seal rings 1A and 1A to the connecting portion 10A1.
- the stepped surface and the end surface of the joint portion 10B of the second vacuum cylinder shaft 10B are fixed in a supported state.
- Each rotary seal ring 1A, 1A is provided with seal surfaces 1A1, 1A1,... On both end surfaces in the axial direction, and a second fluid penetrating inward and outward between the seal surfaces 1A1, 1A1 of each rotary seal ring 1A, 1A.
- a passage 20C is provided.
- the second fluid passage 20C communicates with the inner connection fluid passage 20D.
- Each rotary seal ring 1A and each fixed seal ring 2A described later are hard and wear-resistant materials such as silicon carbide, carbon, hard alloy, composite resin, etc., and are resistant to the coolants Q1 and Q2.
- a pair of both fixed sealing rings 2A and 2A are provided on both axial sides of the rotary sealing ring 1A.
- the fixed seal ring 2A is provided with an opposing seal surface 2A1 in close contact with the seal surface 1A1 on the end surface.
- a coupling portion 2B1 that is one end of an elastic bellows 2B that annularly surrounds the vacuum cylinder shaft 10 is hermetically coupled to the side surface (rear surface) opposite to the opposing seal surface 2A1 by welding or the like.
- the elastic bellows 2B is made of a metal such as stainless steel or a nickel-based alloy (such as Inconel 718), and is an accessory part integrally formed with the fixed sealing ring 2A.
- the fixed portion 2B2 forming the annular shape at the other end of the elastic bellows 2B is hermetically bonded to the inner stepped portion of the seal cover 2B3 by welding or the like. Then, the elastic bellows 2B elastically presses the opposing seal surface 2A1 of the fixed sealing ring 2A in the direction in which it is in close contact with the seal surface 1A1.
- the first interval fluid passage 20B communicates with the first fluid passage 20A provided with the pipe joint portion 20A1.
- the first fluid passage 20A is a fluid passage through which the supply refrigerant Q1 is introduced from the cooling supply device.
- An annular space formed between the peripheral surface and the peripheral surface is the second interval fluid passage 20B. Since the second interval fluid passage 20B does not pass through the second fluid passage 20C provided in the rotary seal ring 1A, it directly communicates with the connection fluid passage 20D. That is, the second interval fluid passage 20B communicating with the second fluid passage 20C of the rotary seal ring 1A and the second fluid passage 20C are not passed between the second interval fluid passage 20B and the connection fluid passage 20D. An interval fluid passage 20B is provided.
- a seal ring 83A having a C-shaped or U-shaped cross section is attached to seal between the joints. (8 pieces are provided in the axial direction in FIG. 3).
- This seal ring 83A is formed in a shape in which an elastic hollow O-ring made of metal (material such as Inconel 718) is provided in a U-shaped groove made of PTFE, or in the shape of a C-shaped metal ring. Make it cold resistant.
- Each seal cover 2B3 and each pipe joint portion 20A1 are sandwiched between a flange portion welded to the end portion of the first outer cylinder 60A and a flange portion welded to the end portion of the second outer cylinder 60B.
- the cover is formed by covering the outer peripheral side of the second mechanical seal device 1 with a bolt 79 (see FIG. 1 or 2) inserted into a bolt hole penetrating in the axial direction.
- each pipe communicating with the first fluid passage 20A of each pipe joint portion 20A1 is formed as a resin pipe or a steel pipe (such as a stainless steel pipe), passes through the second vacuum chamber V2 of the second main body 65, and is not shown. Communicates with the supply device.
- Each of these pipes may be connected to a branch pipe 44A shown in FIG.
- the supplied refrigerant Q1 supplied to the cooling unit 105 through each second fluid passage 20C provided in each rotary seal ring 1A is extremely low temperature liquid helium, liquid nitrogen, or the like.
- the discharged refrigerant Q2 returned to the cooling supply device through the second interval fluid passage 20B is a refrigerant after the cooling unit 105 is cooled (the refrigerant may be vaporized).
- the supply refrigerant Q1 includes liquid helium ( ⁇ 273 ° C. or less), liquid nitrogen ( ⁇ 196 ° C. or less), liquid neon, liquid argon, or the like. These supply refrigerants Q1 are cooled to a cryogenic temperature that can cool the superconducting coil or the like to a superconducting state.
- the second vacuum chamber V2 of the second main body 65 is in a high vacuum state, and each first fluid passage 20A can be thermally insulated by vacuum.
- the second vacuum chamber V2 performs vacuum suction V via the branch pipe 44A. Further, it is possible to prevent the temperature of the supply refrigerant Q1 from rising by covering the branch pipe 44A and the pipe of the first fluid passage 20A with a heat insulating material of fiber reinforced resin such as PTFE.
- the cylindrical second main body 65 that forms a radial direction with respect to the vacuum cylinder shaft 10 is provided on the mounting plate provided on the flange portion of the first outer cylinder 60A and on the flange portion of the second outer cylinder 60B. As shown in FIG. 2, the mounting plate is hermetically coupled using bolts.
- the second main body 65 is formed in a cylindrical shape that forms a radial direction in the first main body 60.
- the second main body 65 surrounds the periphery of the axis of the vacuum cylinder shaft 10. It can also be formed into a sealed cylindrical body.
- the inner diameter of the inner peripheral surface of the first outer cylinder 60A is formed larger than the outer diameter of the outer peripheral surface of the first vacuum cylinder shaft 10A, as shown in FIG. 1, FIG. 2 and FIG.
- the first outer cylinder 60A is fitted with an annular space with respect to the first vacuum cylinder shaft 10A.
- the second outer cylinder 60B is also formed in an approximately symmetrical shape with the first outer cylinder 60A while providing an annular space for fitting with the second vacuum cylinder shaft 10B.
- a vacuum suction pipe 33A is provided at the large-diameter cylindrical end portion 60A of the first outer cylinder 60A so as to evacuate the periphery of the first mechanical seal device 32 and thereby perform vacuum insulation.
- the annular space around the outer periphery of the vacuum cylinder 10 is also vacuum insulated.
- This vacuum drawing pipe 33A is provided with a plurality of through holes that are equally or non-uniformly distributed along the peripheral surface of the large-diameter cylindrical end portion 60A. And the vacuum drawing pipe 33A is connected to this through hole.
- the other of the vacuum drawing pipes 33A communicates with a vacuum suction device (also called a vacuum pump) Va through the first vacuum chamber V1 and the second vacuum chamber V2.
- the first outer cylinder 60 ⁇ / b> A is made of a material such as stainless steel or a nickel-based alloy, like the vacuum cylinder 10.
- the second outer cylinder 60B shown in FIG. 1 or FIG. 2 and FIG. 5 is provided with a through-hole connected to the joint of the vacuum drawing pipe in the large-diameter cylindrical end 60B at one end in the same manner as the first outer cylinder 60A.
- a plurality of through-holes connected to the vacuum piping are provided in a uniform or non-uniform manner along the peripheral surface of the large-diameter cylindrical end portion 60B. Then, the annular space on the outer periphery of the second vacuum cylinder shaft 10B is vacuum-sucked to thermally insulate the second vacuum cylinder shaft 10B.
- the other end of the vacuum suction pipe communicates with the pipe provided in the second main body 65 and is vacuumed by the vacuum suction device Va, similarly to the vacuum suction pipe 33A shown in FIG.
- the cylindrical first main body 60 having the first vacuum chamber V ⁇ b> 1 inside is vacuum insulated by the first vacuum chamber V ⁇ b> 1 surrounding the outer peripheral side of the vacuum cylinder shaft 10 and the outer periphery of the second mechanical seal device 1.
- the side is also vacuum insulated.
- the second mechanical seal device 1, the first fluid passage 20 ⁇ / b> A, the first and second spacing fluid passages 20 ⁇ / b> B, the second fluid passage 20 ⁇ / b> C, and the connection fluid passage 20 ⁇ / b> D are disposed in the second vacuum chamber V ⁇ b> 2 in the second body 65. Double insulation by vacuum.
- the second assembly B is provided on the superconducting motor 100 side of the vacuum cylinder 10 with respect to the first assembly A in FIG.
- This second assembly B is shown enlarged in FIG.
- One of the first bearing portions 60D1 that rotatably supports the vacuum cylinder shaft 10 has an outer peripheral surface fitted on the inner peripheral surface of the first bearing box 30A.
- the first bearing portion 60D1 is attached by fitting the inner peripheral surface to the outer peripheral surface of the sleeve 31. Further, the sleeve 31 is fitted to the outer peripheral surface of the vacuum cylinder shaft 10. Further, the first bearing box 30A is attached and fixed to the case of the superconducting motor 100 via a holding portion indicated by a virtual line.
- a holding plate 30B that holds the first mechanical seal device 32 and supports the first bearing portion 60D1 in the axial direction is provided on the opening side surface of the first bearing box 30A.
- a fluid Q3 such as air or a fluid Q3 such as a lubricant is supplied to the fluid space 30H through the supply passage 33 provided in the holding plate 30B to the first bearing portion 60D1.
- the fluid Q3 flows into the fluid space 30H from the supply passage 33, and acts as a Bach fluid on the first mechanical seal device 32.
- a lubricating liquid may be supplied to the bearing portion 60D1 to cause a lubricating action.
- Rotating seal ring (symbol is omitted) of the first mechanical seal device 32 is fitted to a stainless steel sleeve 31 via an accessory. Further, the stationary seal ring that rotates relative to the rotary seal ring is held in the stepped hole of the holding plate 30B via an accessory. Then, the first mechanical seal device 32 blocks the fluid space 30H on the first bearing portion 60D1 side and the annular space in the first outer cylinder 60A. The large-diameter cylindrical end portion 60A on the holding plate 30B side of the first outer cylinder 60A is fitted to the inner peripheral surface of the first main body 60, and the flange portion at the other end is the seal cover 2B3 as described above. The second main body 65 is continuously coupled via
- the third assembly C is provided on the opposite side to the second assembly B of the vacuum cylinder shaft 10.
- a large-diameter cylindrical end portion 60B of the second outer cylinder 60B fitted to the inner peripheral surface of the first main body 60 is provided with a second bearing portion 60D2 in an inner peripheral stepped hole to support the other.
- the large-diameter cylindrical end portion 60B is supported by a plurality of supports 61.
- the inner peripheral surface of the second bearing portion 60D2 is fitted to the outer peripheral surface of the second vacuum cylinder shaft 10B (see FIG. 1).
- the vacuum cylinder shaft 10 is rotatably supported by the first bearing portion 60D1 and the second bearing portion 60D2.
- the supply passage is communicated with the space 62 on the side surface of the second bearing portion 60D2 as in FIG.
- a non-magnetic ferrofluid sealing cover 41 made of stainless steel or the like is coupled to the end of the second outer cylinder 60B by a bolt with a symbol omitted.
- a magnetic fluid seal device 40 as shown in FIG. 6 is mounted between the inner peripheral surface of the magnetic fluid seal cover 41 and the outer peripheral surface of the second vacuum cylinder shaft 10B.
- High-precision bearings 40D and 40D are provided on both sides of the magnetic fluid sealing device 40 on the inner peripheral surface of the magnetic fluid sealing cover 41, respectively.
- the bearings 40D and 40D have inner peripheral surfaces fitted on the magnetic shaft cover 40A and outer peripheral surfaces fitted on the inner peripheral surface of the magnetic fluid seal cover 41. Furthermore, the shaft cover 40A is fitted to the outer peripheral surface of the second vacuum cylinder shaft 10B via cold-resistant sealing O-rings 80B and 80B arranged in parallel.
- seal projection groups spaced in the axial direction are provided on the outer peripheral surface of the shaft cover 40A made of a magnetic material.
- This seal projection group is provided with a set number of projections 40A1 each having a plurality of ring-shaped cross sections with a predetermined axial width. Preferably, 8 to 15 are provided for each.
- Magnetic material pole blocks 40B and 40B are fitted to the inner peripheral surface of the magnetic fluid seal cover 41 via the sealing O-ring 80A at positions corresponding to the two rows of seal projection groups.
- the inner peripheral surface of the pole blocks 40B, 40B are formed with a small distance of 0.05 mm or less so as not to contact (adjacent to the inner peripheral surface at a non-contact interval). ). This interval is made possible by two high-precision bearings 40D and 40D on both sides.
- a permanent magnet 40M is fitted between the two pole blocks 40B and 40B. Further, a highly accurate magnetic fluid 40F is interposed between the seal projection group 40A140A1... And the inner peripheral surfaces of the pole blocks 40B and 40B. Further, a magnetic flux is formed by the permanent magnet 40M in a loop circuit in which the permanent magnet 40M, the two pole blocks 40B and 40B, and the two seal projection groups 40A1,.
- the magnetic fluid 40F collects between the projection 40A1 of each seal projection group and the inner peripheral surfaces of the pole blocks 40B and 40B, and blocks both axial sides of the gap adjacent to the suction force of the vacuum suction V.
- the suction space 45 is maintained in a high vacuum state without causing sliding resistance.
- a fluid supply passage 40H is provided in a penetrating state on the outer surface of a permanent magnet (not limited to a permanent magnet if it is a magnet) 40M of the magnetic fluid seal cover 41. Then, the permanent magnet 40M is kept warm by the N 2 gas supply fluid Q4 or the air supply fluid Q4. Alternatively, the magnetic fluid 40M can be supplied from the fluid supply passage 40H as the supply fluid F into the inner peripheral surfaces of the pole blocks 40B and 40B.
- the permanent magnet 40M may be sandwiched between the pole blocks 40B and 40B as a ring, or may be arranged in a column shape between the pole blocks 40B and 40B.
- the cross-sectional shape of the outer peripheral surface of the protrusion 40A1 may be a sharp mountain shape or M shape.
- the magnetic fluid sealing device 40 is configured so that the vacuum passage 10H in the vacuum cylinder 10 can be blocked from the outside and maintained at a high vacuum level or higher.
- the pole blocks 40B and 40B and the magnet 40M may be mounted on the outer peripheral surface of the vacuum cylinder shaft 10, and the shaft cover 40A may be mounted on the inner peripheral surface of the magnetic fluid seal cover 41.
- a high-precision magnetic fluid 40F is interposed between the seal projection group 40A140A1... And the inner peripheral surfaces of the pole blocks 40B and 40B.
- the configuration of the magnetic fluid seal device 40 is configured by reversing the inside and outside of the first embodiment, with the inner peripheral part disposed on the outer peripheral side and the outer peripheral part disposed on the inner peripheral side.
- the number of seal projection groups and pole blocks arranged in parallel can be one pair as long as a magnetic circuit can be formed between both parts.
- a connecting cover 42 that faces the opening 10D of the second vacuum cylinder shaft 10B is the end face of the magnetic fluid seal cover 41 (the part surrounding the vacuum cylinder part).
- a suction port 42 ⁇ / b> A is provided at a position facing the opening 10 ⁇ / b> D of the connection cover 42.
- the suction port 42A communicates with the vacuum suction device (vacuum pump) Va shown in FIG.
- the branch pipe 44A branched from the suction pipe 44 is connected to a pipe penetrating into the first main body 60 to suck the inside of the first vacuum chamber V1 and to bring the inside of the first vacuum chamber V1 into a high vacuum state.
- the high vacuum state in the first vacuum chamber V1 of the first main body 60 provides vacuum insulation by doubling the second vacuum chamber V2 of the second main body 65 that insulates the first fluid passages 20A, 20A, 20A. .
- the inside of the inner peripheral surface 10A2 of the vacuum cylinder shaft 10 is sucked from the suction port 42A, and the inside of the vacuum passage 10H is brought into a high vacuum state.
- the high vacuum in the vacuum passage 10H is completely sealed in the inner peripheral surface 10A2 (vacuum passage 10H) of the vacuum cylinder shaft 10 by the high-performance magnetic fluid seal 40.
- a high vacuum (10 ⁇ 3 Torr to 10 ⁇ 7 Torr) or an ultra vacuum (10 ⁇ 7 Torr or less) can be used.
- the inside of the vacuum passage 10H on the outer peripheral side of the first pipe 20E or the second pipe 20E through which the supply refrigerant Q1 passes is 10 ⁇ 3 Torr or less.
- a vacuum state preferably a vacuum state of 10 ⁇ 5 Torr or less
- the ferrofluid sealing device 40 of the present invention can prevent this high vacuum state by effectively blocking the inside of the vacuum passage 10H from the outside. enable.
- the state of high vacuum and ultra high vacuum in the inner peripheral surface 10A2 of the vacuum cylinder shaft 10 highly blocks the temperature of the outside air with respect to the first pipe 20E and the second pipe 20B.
- the supply refrigerant Q1 such as liquid helium, nitrogen, neon, etc., which is supplied from the refrigerant supply device, is kept at an extremely low temperature in the inner peripheral surface 10A2 of the vacuum cylinder shaft 10, and this supply is performed.
- the refrigerant Q1 is supplied from the first pipe 20E and the second pipe 20E to the cooling unit 105 of the superconducting motor 100 to cool the cooling unit 105.
- first and second pipes 20E, 20E, and 20E are disposed in the inner peripheral surface 10A2 of the vacuum cylinder shaft 10, the outer peripheral surfaces of the first and second pipes 20E, 20E, and 20E are PTFE, It can be covered (covered) with a heat insulating material such as quartz. For this reason, the heat insulation effect of the 1st piping 20E and 20E and the 2nd piping 20E can be exhibited, and the sealing capability of the 2nd mechanical seal device 1 can be maintained.
- first and second interval fluid passages 20B and 20B arranged in parallel in the second mechanical seal device 1 since the refrigerant of the same pressure flows in the interval fluid passages 20B and 20B, the seal surface 1A1 and Both sides of the opposed seal surface 2A1 in the close radial direction have substantially the same pressure, and even if the discharged refrigerant Q2 is vaporized, the vacuum cylinder shaft 10 is rotating, so that it is linear due to the centrifugal force. To the refrigerant supply device through the first fluid passage 20A. Therefore, even if the discharged refrigerant Q2 is vaporized, it can be effectively prevented from entering the supplied refrigerant Q1 through the sliding surface between the seal surface 1A1 and the opposing seal surface 2A1.
- the cooling section (superconducting field coil) 105 of the superconducting motor 100 is cooled to the extremely low temperature by the supplied refrigerant Q1 at the extremely low temperature, and the electric resistance is zero ( 0).
- the superconducting field coil is excited, a strong magnetic field having no excitation loss is generated in the superconducting field coil whose electric resistance is zero (0).
- FIG. 7 is a front view of the connecting portion 10A1 side corresponding to the XX arrow in FIG. 1 according to the second embodiment.
- the connecting portion 10A1 is formed in a cylindrical shape shorter than the connecting portion 10A1 shown in FIG. 2, and a circular vacuum passage 10H is formed in the inner peripheral surface. 7 is formed at four or more locations (four locations in FIG. 7) in the radial direction of the connection portion 10A1, similarly to the connection fluid passage 20D shown in the connection portion 10A1 of FIG. Of these, the first pipes 20E are sealed and fitted into the connection holes 20D1 of the three connection fluid passages 20D, 20D, and 20D, respectively.
- the supply refrigerant Q1 flows through the first pipe 20E.
- connection fluid passages 20D, 20D, and 20D for the three supply refrigerants Q1 are formed at different positions in the circumferential direction although the positions in the axial direction are substantially the same in the connection portion 10A1 (second fluid in FIG. 8). (Refer to the arrangement of the passage 20C).
- connection fluid passage 20D for the discharged refrigerant Q2 communicates with the second interval fluid passage 20B so that the three connection fluid passages 20D, 20D, and 20D for the supply refrigerant Q1 are axially connected to each other at the connection portion 10A1. Change position. Accordingly, since the connecting portion 10A1 can be formed in a cylindrical shape that is short in the axial direction, the length of the vacuum passage 10H in the axial direction can also be shortened.
- the effect of vacuum heat insulation can be improved by forming the inner diameter of the connecting portion 10A1 in various shapes.
- the front shape of the vacuum passage 10H in the connecting portion 10A1 is not limited to a circular shape, but may be a rectangular inner peripheral surface, a star-shaped or gear-shaped inner peripheral surface, an elliptical inner peripheral surface, or the like. It can be devised so that a large number of first pipes 20E and second pipes can be connected to the side surfaces. Note that only one second mechanical seal is required for the connection fluid passages 20D, 20D, and 20D for the three supply refrigerants Q1.
- coolant Q1 is supplied to the superconducting field coil of the superconducting motor 100 by many 1st piping 20E, and an electrical resistance is made into zero (0) by cooling a conduction field coil to extremely low temperature. be able to. Moreover, it is comprised similarly to the connection fluid channel
- coolant Q2 can be made into a plurality, and the discharge
- FIG. 8 is a front view of the rotary seal ring 1A fitted to the vacuum cylinder shaft 10 as seen from the axial direction.
- This rotary seal ring 1A is Example 3.
- a rotary seal ring 1A shown in FIG. 8 is an example in which second fluid passages 20C penetrating through four locations along the peripheral surface are provided.
- the inner peripheral surface 1A3 of the rotary seal ring 1A is fitted to the outer peripheral surface of the connection portion 10A1 so that the four second fluid passages 20C and the four connection fluid passages 20D communicate with each other.
- the supply refrigerant Q1 supplied from one first fluid passage 20A flows into the four second fluid passages 20C.
- seal surfaces 1A1 and 1A1 are formed on both end surfaces of the rotary seal ring 1A.
- a seal mounting groove 1A4 to which a seal ring 83B shown in FIG. 3 can be attached is formed on the inner peripheral side of both seal surfaces 1A1 of the rotary seal ring 1A.
- the second fluid passage 20C of the rotary seal ring 1A and the connection fluid passage 20D of the connection component 10A1 have been described, but the second fluid passage 20C is connected to the second fluid passage 20C according to the number of the cooling parts 105.
- the fluid passage 20D and the second pipe 20E can be provided in a large number of five or six. By doing in this way, it becomes possible to supply supply refrigerant
- the configuration in which the supply refrigerant Q1 can be supplied to a large number of cooling units 105 by the single second mechanical seal device 1 is made possible by a combination of the configuration of the second mechanical seal device 1 of the present invention and the connecting component 10A1.
- the second mechanical seal device 1 may be composed of one second mechanical seal. In this case, although not shown, the second pipe is provided in another fluid passage so that the discharged refrigerant is returned to the cooling supply device.
- the main body is a fixed part such as the first main body 60, the second main body 65, the first outer cylinder 60 ⁇ / b> A, the second outer cylinder 65 ⁇ / b> A with respect to the rotating vacuum cylinder shaft 10.
- the present invention maintains the temperature of a cryogenic refrigerant such as liquid nitrogen or liquid helium, supplies the supplied refrigerant from the refrigerant supply device on the stationary part side to the cooling part of the rotating superconducting device, and collects the used refrigerant It can be a useful rotary joint.
- a cryogenic refrigerant such as liquid nitrogen or liquid helium
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Abstract
Description
また、筒状ケーシング168内に配置された運動間隙シール162は、内周側を入口極低温気体157が流れるとともに、外周側を高温冷却ガス164が流れる構成のために、極低温によって材質が劣化してシール能力を低下する恐れがある。特に、外部との断熱効果が低い極低温剤移送継手26の構成では、多量の入口極低温気体157をSCコイル巻き線へ供給しなければならないから、運動間隙シール162は、早期に劣化する恐れがある。
従来の磁性流体シール装置を含めたシール手段では、摺動面が真空引きされて摺動面の潤滑液が吸い取られるので、シール面が摩耗する。その結果、シール面間を介して空気流177や、さらには、戻りガスが円筒状ハウジング186内に徐々に浸入して冷却流体を極低温の30°K以下に保持することが困難になる。この入口極低温気体157を30°K以下に維持することができないと、超伝導コイル(コイル巻線34)の超伝導の効果は発揮できなくなる。このために、必要以上の入口極低温気体157の流量を超伝導コイル側へ供給しなければならない。この現状では、ヘリウム等の冷却流体が高価であるために、同期発電機械等のランニングコストが上昇する。
最初に、図1のロータリジョイントRと連結する図9の超伝導モータ100について説明する。ただし、本発明ではない超伝導モータ100については、簡単に説明する。
Claims (4)
- 固定側の冷媒供給装置と回転側の冷却部との流体通路間を接続する冷媒用のロータリジョイントであって、
本体に回転可能に支持されるとともに軸方向に貫通する真空通路を有し、且つ前記真空通路の一端に前記冷却部の連通路と連通可能にする連結部と、前記真空通路の他端に真空引用の開口部と、前記連結部と前記開口部の中間に接続部とを有する真空用筒軸、
前記真空用筒軸の前記接続部に密封に嵌着するとともに両端面に各シール面を有する回転密封環、
前記回転密封環の軸方向両側に配置されて対向する前記シール面と密接する対向シール面を有する両固定密封環、
前記各固定密封環の対向シール面と反対の周面に一端の結合部が密封に連結するとともに他端の固定部が前記真空用筒軸を囲んで前記本体に密封に固着して前記固定密封環を前記シール面へ弾性に押圧する弾性ベローズ、
前記回転密封環を挟んだ両側の前記弾性ベローズの間に形成されて供給冷媒を導入する第1流体通路と連通可能な第1間隔流体通路、
前記回転密封環を径方向へ貫通するとともに前記第1間隔流体通路と連通する第2流体通路、
前記接続部の内部に設けられて一端が前記第2流体通路に連通するとともに他端に接続孔を設けた接続流体通路、
前記接続孔に一端が接続して前記接続流体通路と連通するとともに、他端が前記冷却部側の流通路と連通可能な流体通路を有し、且つ前記真空用筒軸の真空通路に配置された第1配管、
前記真空用筒軸の開口部から前記真空通路内を真空吸引する吸引口を有する連結カバー、
及び前記連結カバーと密封に結合して前記真空用筒軸を囲む磁性流体シール用カバーと、前記磁性流体シール用カバーの内周面と前記真空用筒軸の外周面との間の一方の周面に密封に嵌着するとともに並列に配列された磁石用のポールブロックと、前記ポールブロックの並列する間に配置された磁石と、前記各ポールブロックの周面に近接して対向する環状の突起が複数個に配列されて突起群を成すとともに他方の周面に密封に嵌着する軸カバーと、前記突起と前記ポールブロックの間に介在する磁性流体とを有し、前記真空吸引する力に対して磁力を受けた前記磁性流体が前記突起と前記ポールブロックとの間を遮断する磁性流体シール装置を具備することを特徴とするロータリジョイント。 - 一対を成す前記回転密封環と両側の固定密封環とは少なくとも軸方向に2組が配列されているとともに、前記一方の組の前記固定密封環と隣接する前記他方の組の前記固定密封環との対向間に第2間隔流体通路を有し、前記第2間隔流体通路は前記真空用筒軸の前記真空通路に配置された第2配管と連通し、前記冷却部を冷却した排出冷媒が前記第2配管と前記第2間隔流体通路を通って戻されることを特徴とする請求項1に記載のロータリジョイント。
- 前記接続部は内周面を円形面又は楕円形面又は周方向に沿って凹凸面又は歯車状面に形成されて前記第1配管側の端部に接続孔が形成されていることを特徴とする請求項1又は請求項2に記載のロータリジョイント。
- 前記回転密封環は周方向に沿って配列された複数の前記第2流体通路を有するとともに、前記接続部にも周方向に沿って前記各第2流体通路と連通する前記接続流体通路を有し、各前記第1配管の前記流体通路が各対応する前記接続流体通路に連通していることを特徴とする請求項1又は請求項2又は請求項3に記載のロータリジョイント。
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US12/934,663 US9695942B2 (en) | 2008-03-28 | 2009-02-13 | Rotary joint |
CN200980111936.9A CN101981360B (zh) | 2008-03-28 | 2009-02-13 | 旋转接头 |
EP09725041.9A EP2258970B1 (en) | 2008-03-28 | 2009-02-13 | Rotary joint |
JP2010505438A JP5325878B2 (ja) | 2008-03-28 | 2009-02-13 | ロータリジョイント |
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CN101737497A (zh) * | 2010-02-11 | 2010-06-16 | 北京交通大学 | 一种磁性液体与三斜口填料环组合式往复轴密封装置 |
WO2013099385A1 (ja) * | 2011-12-27 | 2013-07-04 | イーグル工業株式会社 | 回転継手 |
US11047430B2 (en) * | 2017-07-10 | 2021-06-29 | Zte Corporation | Rotating shaft connection apparatus and multi-screen mobile terminal device |
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Also Published As
Publication number | Publication date |
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EP2258970A1 (en) | 2010-12-08 |
JPWO2009119176A1 (ja) | 2011-07-21 |
US20110018255A1 (en) | 2011-01-27 |
TWI426687B (zh) | 2014-02-11 |
US9695942B2 (en) | 2017-07-04 |
JP5325878B2 (ja) | 2013-10-23 |
CN101981360B (zh) | 2015-06-17 |
EP2258970B1 (en) | 2018-06-13 |
CN101981360A (zh) | 2011-02-23 |
EP2258970A4 (en) | 2016-07-13 |
TW200952311A (en) | 2009-12-16 |
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