JP4704869B2 - Superconducting rotating electrical machine refrigerant supply / discharge device - Google Patents

Description

  The present invention relates to a refrigerant supply / discharge device for a superconducting rotating electrical machine.

  As a superconducting rotating electrical machine, a generator using a superconducting wire for a field winding of a rotor is known. A field winding using a superconducting wire needs to be cooled to an extremely low temperature of about 100 K or less in order to maintain its superconductivity, and liquid helium, gaseous helium, liquid nitrogen, or the like is used as a cooling medium (refrigerant). ing.

A refrigerant supply / discharge device for a superconducting rotating electrical machine is provided at a rotating shaft end portion of a rotor, and supplies a refrigerant into a rotor and a field winding from a refrigerant supply pipe inserted at the center of the rotating shaft. . The return refrigerant after cooling, which has absorbed the heat generated by the rotor including the field winding and became relatively high temperature, was formed using a magnetic fluid seal composed of a pair of pole pieces, a magnet, a magnetic fluid, and the like. Through the space between the rotating shaft and the fixed body (casing), it is collected from the inside of the rotating shaft to the fixed body side (see, for example, Patent Document 1). The temperature of the return refrigerant was about 200K to 300K, which was a temperature range in which the magnetic fluid seal could be used.
JP-A-8-308211

  By the way, in the high-temperature superconducting electric rotating machine that has been developed in recent years in each country, the temperature of the return refrigerant that has absorbed the heat generated by the rotor including the field windings has reached a very low temperature of about 100K. For this reason, the conventional refrigerant supply / discharge device has a problem that the magnetic fluid seal is frozen and the cryogenic return refrigerant cannot be recovered from the inside of the rotating shaft to the fixed body side. Further, in the conventional refrigerant supply / discharge device, the fixed body such as the casing is at room temperature, and heat from outside enters the return refrigerant from the inside of the rotating shaft through the fixed body, so that the return refrigerant after recovery However, there is a problem that the temperature of the cooling device increases and the cooling device for cooling to a very low temperature increases.

  The present invention has been made to solve the above-described problems. The refrigerant supplied to and discharged from the superconducting rotating electric machine can be used at a very low temperature, and the heat can be prevented from entering the refrigerant from the outside. An object of the present invention is to obtain a refrigerant supply / discharge device for a superconducting rotating electrical machine in which a cooling device for recooling the refrigerant can be made relatively small.

  In order to solve the above-described problems, a refrigerant supply / discharge device for a superconducting rotating electrical machine according to the present invention is provided at an end of a rotor, is coaxially arranged at the center of a rotation axis, and an inner space is an interior of the rotor. The first rotary vacuum heat insulation pipe communicated with the first rotary vacuum heat insulation pipe and the second rotary vacuum insulation pipe coaxially arranged on the outer peripheral side of the first rotary vacuum heat insulation pipe, the inner space communicating with the interior of the rotor A rotary vacuum insulation pipe and a fixed body provided on the outer peripheral side of the second rotary vacuum heat insulation pipe and rotatably supporting the second rotary vacuum heat insulation pipe via a bearing, and on the side of the fixed body A fixed shaft that is connected and provided on the outer peripheral side of the end portion of the second rotary vacuum heat insulating pipe and has a vacuum heat insulating section formed on the inner peripheral surface thereof, and the inside of the first rotary vacuum heat insulating pipe Provided on the circumferential side, the open end is located in the first rotary vacuum insulation pipe A constant vacuum heat insulation pipe, a first sealing member made of a cold-resistant material for sealing between the fixed vacuum heat insulation pipe and the first rotary vacuum heat insulation pipe, the second rotary vacuum heat insulation pipe and the fixed A second seal member made of a cold-resistant material that seals between the vacuum heat insulation portion of the shaft, the second rotary vacuum heat insulation pipe, and the vacuum heat insulation portion of the fixed shaft, and the second seal A magnetic fluid seal provided on both sides of the evacuation port provided on the fixed shaft, located on the bearing side of the member, and the second rotation provided on the outside of the fixed shaft. A cooling device that is connected to the vacuum heat insulation pipe and the vacuum heat insulation portion of the fixed shaft and to the internal space of the fixed vacuum heat insulation pipe to supply and recover the refrigerant that cools the rotor. .

  The superconducting rotating electrical machine refrigerant supply / discharge device according to the present invention is provided at the end of the rotor, is coaxially disposed at the center of the rotation axis, and has an inner space communicating with the interior of the rotor. A rotary vacuum heat insulation pipe, a second rotary vacuum heat insulation pipe arranged coaxially on the outer periphery of the first rotary vacuum heat insulation pipe and having an inner space communicating with the interior of the rotor, It is arranged coaxially with the second rotary vacuum heat insulation pipe on the outer peripheral side of the second rotary vacuum heat insulation pipe, and the inner space communicates with the inside of the rotor, and is spaced from the tip. A pair of end plates is fixed, a space between the pair of end plates is evacuated, and a vacuum heat insulating rotating shaft having a bellows structure portion formed on an inner peripheral surface of the tip portion, and the first rotary vacuum heat insulating material A space on both sides in the axial direction, arranged between the piping and the vacuum heat insulating rotary shaft A first pipe support that shuts off and insulates, and a second pipe support that is disposed between the second rotary vacuum heat insulation pipe and the vacuum heat insulation rotary shaft and blocks and insulates the space on both sides in the axial direction. And a fixed body that rotatably supports the vacuum heat insulating rotating shaft via a pair of bearings, and that has a vacuum heat insulating portion provided on an inner peripheral surface located between the pair of bearings, and the fixed body and the A first refrigerant flow hole formed through the vacuum heat insulating portion and the vacuum heat insulating rotating shaft and communicated with a space between the end plate and the first pipe support; the fixed body; and the vacuum heat insulating material. A second refrigerant flow hole formed through the portion and the vacuum heat insulating rotating shaft and communicated with the space between the first and second pipe supports, and the first refrigerant flow hole interposed therebetween. Vacuum disconnection between the vacuum heat insulating rotary shaft and the fixed body located on both sides thereof A first seal member made of a cold-resistant material installed in a space between the first portion, the vacuum heat insulating rotary shaft located on both sides of the second coolant circulation hole, and the fixed body A second sealing member made of a cold-resistant material installed in a space between the vacuum heat insulating portion, the vacuum heat insulating rotating shaft located on the anti-refrigerant circulation hole side of the first and second sealing members, and the A pair of magnetic fluid seals installed in the space between the vacuum heat insulating portion of the fixed body and the fixed body and the vacuum heat insulating portion are formed so as to communicate with the space between each pair of magnetic fluid seals. And a cooling device that communicates with the first and second refrigerant flow holes via a pipe to supply and recover the refrigerant that cools the rotor.

  Furthermore, a refrigerant supply / discharge device for a superconducting rotating electrical machine according to the present invention is provided at the end of the rotor, is coaxially disposed at the center of the rotation axis, and has an inner space communicating with the interior of the rotor. A rotary vacuum heat insulation pipe, a second rotary vacuum heat insulation pipe coaxially disposed on the outer peripheral side of the first rotary vacuum heat insulation pipe and having an inner space communicating with the interior of the rotor, Provided at the end of the child, arranged coaxially with the second rotary vacuum heat insulation pipe on the outer peripheral side of the second rotary vacuum heat insulation pipe, and the inner peripheral surface of the tip and the first rotary vacuum A pair of end plates are fixed between the heat insulation pipes in the axial direction, a space between the pair of end plates is evacuated, and a bellows structure portion is formed on the inner peripheral surface of the tip portion. Between the vacuum heat insulation rotary shaft, the second rotary vacuum heat insulation pipe and the vacuum heat insulation rotary shaft A pipe support that is disposed and that shields and insulates the space on both sides in the axial direction; and an inner peripheral surface that rotatably supports the vacuum heat insulating rotary shaft via a pair of bearings and is positioned between the pair of bearings. A fixed body provided with a vacuum heat insulating part, and a refrigerant formed through the fixed body, the vacuum heat insulating part, and the vacuum heat insulating rotating shaft, and communicated with a space between the end plate and the pipe support. A sealing member made of a cold-resistant material installed in a space between the flow hole and the vacuum heat insulating rotary shaft located on both sides of the flow hole and the vacuum heat insulating part of the fixed body so as to sandwich the refrigerant flow hole; Between a pair of magnetic fluid seals respectively installed in a space between the vacuum heat insulating rotating shaft and the vacuum heat insulating portion of the fixed body located on the anti-refrigerant circulation hole side of these seal members, and between each pair of magnetic fluid seals The fixed body so as to communicate with the space And an evacuation port formed through the vacuum heat insulating part, and an end plate provided on the inner peripheral side of the first rotary vacuum heat insulating pipe and attached to the end of the fixed body. A fixed vacuum heat insulating pipe whose open end is located in the first rotary vacuum heat insulating pipe, and a refrigerant that cools the rotor by communicating with the fixed vacuum heat insulating pipe and the refrigerant circulation hole via the pipe. A cooling device for supplying and recovering.

  According to the present invention, the flow path of the refrigerant is surrounded by the vacuum heat insulating layer such as the first and second rotary vacuum heat insulating pipes, and the refrigerant exchanges heat with the outside, or the supplied refrigerant and the recovered refrigerant. Can suppress the phenomenon of heat exchange. In addition, the space formed by the magnetic fluid seal is always maintained in a vacuum state, so that heat from the outside can be prevented from entering the seal member side. Due to its presence, it does not come into contact with the refrigerant, and the inner and outer peripheries are sandwiched between the vacuum heat insulating layers and insulated from the refrigerant, so that problems such as freezing do not occur even when the refrigerant is in an extremely low temperature state.

  Thus, even when the return refrigerant is used at an extremely low temperature, the magnetic fluid seal or the sealing member is not disabled, and the return refrigerant is re-cooled because the return refrigerant is at an extremely low temperature. Therefore, it is not necessary to increase the size of the cooling device.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of a refrigerant supply / discharge device for a superconducting rotating electrical machine according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a rotor having a field winding (not shown) on the outer periphery and formed hollow inside, and first and second rotary vacuum heat insulating pipes 2 are provided at the end of the rotor 1. 3 is connected so that it may extend toward the axial direction outer side (illustration left side) from the rotor 1. FIG. Each of the first and second rotary vacuum heat insulation pipes 2 and 3 is composed of a double pipe, and has a heat insulation structure in which plugs 2a and 3a are attached between the end portions and the inside is evacuated. ing.

  The first and second rotary vacuum heat insulating pipes 2 and 3 have the same axial length and different diameter dimensions, and are arranged coaxially around the rotary shaft center 50, and the inner spaces are described later. It becomes a passage for a refrigerant to communicate with the inside of the rotor 1.

  A cylindrical fixed body 4 constituting a casing is provided on the outer peripheral side of the second rotary vacuum heat insulating pipe 3, and bearings 5, between the fixed body 4 and the second rotary vacuum heat insulating pipe 3 are provided. 5 is disposed, and the second rotary vacuum heat insulating pipe 3 is rotatably supported by the fixed body 4. A cylindrical fixed shaft 6 is connected to the side of the axial end portion of the fixed body 4.

  A vacuum heat insulating portion 7 formed of a double pipe is provided on the inner peripheral surface of the fixed shaft 6, and a sealing member (first member) is provided between the vacuum heat insulating portion 7 and the second rotary vacuum heat insulating pipe 3. 2 seal member) 8 and a magnetic fluid seal 9 are provided. The seal member 8 is for sealing between the vacuum heat insulating portion 7 and the second rotary vacuum heat insulating pipe 3, and is excellent in cold resistance like Teflon (a product name of DuPont) and can be used even at about 10K. It is formed in a ring shape having a rectangular cross section by a sealing material such as a fluororesin, and one or more are arranged along the axial direction on the end side of the second rotary vacuum heat insulating pipe 3. The number of the sealing members 8 to be installed is determined by the pressure of the refrigerant to be sealed, and an appropriate number according to the pressure is provided.

  The magnetic fluid seal 9 is composed of a pair of pole pieces, a magnet, and a magnetic fluid, and sandwiches a vacuum suction port 10 that is located closer to the bearing 5 than the seal member 8 and includes a through hole provided in the fixed shaft 4. As shown in FIG. The magnetic fluid seals 9 and 9 seal the heat from outside such as the fixed body 4 at room temperature by constantly evacuating the space between the vacuum heat insulating portion 6 and the second rotary vacuum heat insulating pipe 3. This is for suppressing entry into the member 8 side. A ring-shaped permanent magnet 11 is provided around the vacuum port 10.

  An end plate (not shown) is provided at the left end of the fixed shaft 6 in the figure, and a fixed vacuum heat insulating pipe 12 is provided through the end plate. The fixed vacuum heat insulating pipe 12 is also constituted by a double pipe, and has a heat insulating structure in which a stopper 12a is attached between the end portions and the inside is evacuated. The fixed vacuum heat insulation pipe 12 is coaxially arranged around the rotation axis center 50 so as to extend toward the rotor 1, and the tip opening (open end) thereof is the internal space of the first rotary vacuum heat insulation pipe 2. It arrange | positions so that it may be located in.

  Between the fixed vacuum heat insulation pipe 12 and the first rotary vacuum heat insulation pipe 2, one or a plurality of seal members (first seal members) 13 formed of a seal material such as fluororesin are disposed. And the space between them is sealed.

  A cooling device 14 for a refrigerant such as liquid helium, gaseous helium or liquid nitrogen is provided outside the fixed shaft 6 and outside the end plate through which the fixed vacuum heat insulating pipe 12 passes. The cooling device 14 communicates with the fixed vacuum heat insulating pipe 12 through a pipe 14 a so that the refrigerant can be supplied to and discharged from the stator 1. Further, the cooling device 14 is communicated with a space between the vacuum heat insulating portion 7 and the fixed vacuum heat insulating pipe 12 located inside the end plate via the pipe 14b, and further, the first and second rotary vacuum heat insulating pipes 2, The refrigerant can be supplied to and discharged from the stator 1 by communicating with the space between the stator 3 and the stator 3.

  In the refrigerant supply / discharge device of the superconducting rotating electrical machine configured as described above, the refrigerant of the cooling device 14 is between the fixed vacuum heat insulating pipe 12 and the vacuum heat insulating portion 7 of the fixed shaft 6 as indicated by the solid line arrow 51. It is supplied to the inside of the rotor 1 including the field winding through the space and further through the space between the first rotary vacuum insulation pipe 2 and the second rotary vacuum insulation pipe 3, and from the inside of the rotor 1. The return refrigerant passes through the inside of the first rotary vacuum insulation pipe 2 and is further collected through the inside of the fixed vacuum insulation pipe 12.

  As a modification, contrary to the above, as indicated by the dotted arrow 52, the refrigerant of the cooling device 14 passes from the inside of the fixed vacuum heat insulation pipe 12 to the inside of the rotor 1 through the inside of the first rotary vacuum heat insulation pipe 2. The refrigerant returned from the inside of the rotor 1 is passed through the space between the first rotary vacuum heat insulation pipe 2 and the second rotary vacuum heat insulation pipe 3, and further between the fixed vacuum heat insulation pipe 12 and the fixed shaft 6. It can also comprise so that it may collect | recover through the space between the vacuum heat insulation parts 7. FIG.

  Therefore, according to the present embodiment, the refrigerant flow path is surrounded by the vacuum heat insulation layers such as the first and second rotary vacuum heat insulation pipes 2 and 3, the vacuum heat insulation section 7 and the fixed vacuum heat insulation pipe 12. Thus, the phenomenon that the refrigerant exchanges heat with the outside, or the supply refrigerant and the recovered refrigerant exchange heat can be suppressed. The space between the fixed shaft 6 formed by the magnetic fluid seal 9 and the second rotary vacuum heat insulating pipe 3 is evacuated by a vacuum pump (not shown) connected to the evacuation port 10 and is always in a vacuum state. By being maintained at, it is possible to suppress heat from outside such as the fixed body 4 from entering the refrigerant side. In addition, the magnetic fluid seal 9 is not in contact with the refrigerant due to the presence of the seal member 8, and the inner and outer peripheries are sandwiched between the second rotary vacuum heat insulating pipe 3 and the vacuum heat insulating portion 7 to be insulated from the refrigerant. Even at extremely low temperatures, there will be no problems such as freezing.

  Thus, even when the return refrigerant is used at a temperature of about 100K or less, the magnetic fluid seal 9 and the seal members 8 and 13 are not disabled, and the return refrigerant is at a very low temperature of 100K or less. As a result, it is not necessary to increase the size of the cooling device 14 in order to recool the return refrigerant.

  When a plurality of seal members 8 and 13 are installed, the temperature increases as the distance from the refrigerant increases, and a temperature gradient can be gradually created for each of the plurality of seal members. It is possible to install differently.

  FIG. 2 is a cross-sectional view showing a main part of a refrigerant supply / discharge device for a superconducting rotating electrical machine according to a second embodiment of the present invention. In FIG. 2, the main difference between the present embodiment and the first embodiment is that the fixed body 16 is provided with a refrigerant supply / discharge port from the cooling device 14 to the superconducting rotating electrical machine.

  First and second rotary vacuum heat insulation pipes 22 and 23 are connected to the end of the rotor 1 so as to extend from the rotor 1 toward the outside in the axial direction (the left side in the drawing). Each of the first and second rotary vacuum heat insulation pipes 22 and 23 is composed of a double pipe, and has a heat insulation structure in which plugs 22a and 23a are attached between the ends and the inside is evacuated. ing. The first and second rotary vacuum heat insulating pipes 22 and 23 have different axial lengths and diameter dimensions, are coaxially arranged around the rotary shaft center 50, and a refrigerant whose inner space is described later. And is communicated with the interior of the rotor 1.

  On the outer peripheral side of the rotary vacuum heat insulation pipe 22.23, there is provided a vacuum heat insulation rotary shaft 15 that is connected to the end of the rotor 1 and extends to the left side of the drawing. The vacuum heat insulating rotary shaft 15 is composed of a double tube, and has a heat insulating structure in which a stopper 15a is attached between the end portions and the inside is evacuated. The vacuum heat insulating rotary shaft 15 is provided with first and second refrigerant circulation holes 15b and 15c with different positions in the axial direction, and a bellows structure portion 15d is provided on the inner peripheral surface of the tip portion. It has been. The front end portion of the vacuum heat insulating rotary shaft 15 is closed by airtightly fixing end plates 16 and 17 on both sides in the axial direction so as to sandwich the bellows structure portion 15d, and the pair of end plates 16 and 17 are closed. The space between them has a heat insulating structure that is evacuated.

  The inner periphery of the vacuum heat insulating rotary shaft 15 is respectively disposed between the outer peripheral surfaces of the open end portions of the first and second rotary vacuum heat insulating pipes 22 and 23 located closer to the rotor 1 than the end plate 17. The first and second pipe supports 18 and 19 having a cross-sectional box shape having a vacuum structure are arranged in an airtight manner over the entire circumference, and the pipe supports 18 and 19 allow a space on both sides in the axial direction to be provided. It is cut off and insulated. Thereby, the internal space of the first rotary vacuum heat insulating pipe 22 communicates with the space surrounded by the end plate 17 and the first pipe support 18, and further communicates with the first refrigerant circulation hole 15b. On the other hand, the internal space of the second rotary vacuum heat insulating pipe 23 communicates with the space surrounded by the first and second pipe supports 18 and 19 and communicates with the second refrigerant circulation hole 15c.

  A cylindrical fixed body 24 is provided on the outer periphery of the vacuum heat insulating rotary shaft 15. Bearings 20 and 20 are provided between both ends of the fixed body 24 and the vacuum heat insulating rotary shaft 15, respectively, and the vacuum heat insulating rotary shaft 15 is rotatable to the fixed body 24 via the bearings 20 and 20. It is supported. The fixed body 24 is provided with a vacuum heat insulating portion 21 having a double-pipe structure on an inner peripheral surface located between the pair of bearings 20. Further, the fixed body 24 is provided with first and second refrigerant circulation holes 24a and 24b and first to third vacuum suction ports 24c, 24d and 24e with an interval in the axial direction.

  The first and second refrigerant flow holes 24a and 24b are formed so that the inner peripheral side opening of the fixed body 24 penetrates the vacuum heat insulation part 21, respectively, and the first and second refrigerant flow holes 15b and It opens so that it may oppose 15c, and the outer peripheral side opening part is connected to the cooling device 14 via piping 14c, 14d.

  Further, between the vacuum heat insulating portion 21 and the vacuum heat insulating rotating shaft 15 located on both sides of the first and second refrigerant circulation holes 24a and 24b, a first made of a fluororesin having cold resistance or the like is provided. One or more seal members 25, 26 and second seal members 27, 28 are provided. The first to third evacuation ports 24c to 24e are on the side of the anti-refrigerant circulation holes 24a and 24b of the first seal members 25 and 26 and the second seal members 27 and 28 (that is, from the refrigerant flow holes 24a and 24b). It is located on the far side.

  The inner peripheral side opening of the first evacuation port 24c is located on the side opposite to the refrigerant flow hole 24a of the first seal member 25 (that is, the side far from the refrigerant flow hole 24a) and penetrates the vacuum heat insulating part 21. An opening is formed in a space between the vacuum heat insulating portion 21 and the vacuum heat insulating rotating shaft 15. The inner peripheral side opening of the second evacuation port 24d is located on the side of the anti-refrigerant flow hole 24a of the first seal member 26 and the side of the anti-refrigerant flow hole 24b of the second seal member 27. Is opened in a space between the vacuum heat insulating portion 21 and the vacuum heat insulating rotating shaft 15. The opening part on the inner peripheral side of the third evacuation port 24e is located on the anti-refrigerant circulation hole 24b side of the second seal member 28, penetrates the vacuum heat insulating part 21, and the vacuum heat insulating part 21 and the vacuum heat insulating rotating shaft 15 It is opened in the space between.

  In the space between the vacuum heat insulating portion 21 and the vacuum heat insulating rotary shaft 15 corresponding to the inner peripheral side opening of each vacuum suction port 24c to 24e, the vacuum suction ports 24c to 24e are respectively sandwiched on both sides thereof. A pair of magnetic fluid seals 29, 30, and 31 are provided, and these spaces are evacuated by a vacuum pump connected to each evacuation port 24c to 24e.

  In the refrigerant supply / exhaust device for a superconducting rotating electrical machine thus configured, the refrigerant supply / exhaust port of the cooling device 14 is formed in the stationary body 24, and the refrigerant of the cooling device 14 is, for example, as shown by a solid line arrow 53. 1 is passed through the space between the end plate 17 and the first pipe support 18 from the refrigerant flow hole 24a, and is further supplied to the interior of the rotor 1 through the internal space of the first rotary vacuum heat insulating pipe 22. The return refrigerant from the inside of the second refrigerant passes through the space between the first and second rotary vacuum heat insulating pipes 22 and 23, and further passes through the space between the first and second pipe supports 18 and 19 to pass through the second refrigerant. It will be collected through the flow hole 24b.

  As a modified example, on the contrary to the above, as indicated by a dotted arrow 54, the refrigerant of the cooling device 14 is passed through the second refrigerant flow hole 24b, and the space between the first and second pipe supports 18, 19 is provided. And supplying the interior of the rotor 1 through the space between the first and second rotary vacuum insulation pipes 22 and 23, and passing the return refrigerant from the interior of the rotor 1 through the first rotary vacuum insulation pipe 22; Furthermore, it can be configured to pass through the space between the end plate 17 and the pipe support 18 and collect through the first refrigerant circulation hole 24a.

  According to the present embodiment, the refrigerant flow path includes the first and second rotary vacuum heat insulation pipes 22, 23, the vacuum heat insulation part 7, the end plate 17, the first and second pipe supports 18, 19, and the like. It is surrounded by the vacuum heat insulating layer, and the phenomenon that the refrigerant exchanges heat with the outside or the supply refrigerant and the recovered refrigerant exchange heat can be suppressed. In addition, the space between the vacuum heat insulating portion 21 and the vacuum heat insulating rotating shaft 15 formed by the magnetic fluid seals 29 to 31 is always maintained in a vacuum state, so that heat from the outside is transferred to the first seal member 25. , 26 and the second seal members 27, 28 can be prevented from entering.

  Further, since the bellows structure portion 15d is provided on the inner peripheral side of the vacuum heat insulating rotary shaft 15 located between the pair of end plates 16 and 17, the heat conduction distance becomes long, and the end plate 16 located on the outer side in the axial direction. From the heat can be reduced. In addition, the magnetic fluid seals 29 to 31 do not come into contact with the refrigerant due to the presence of the first seal members 25 and 26 and the second seal members 27 and 28, and the inner and outer circumferences are connected to the vacuum heat insulating rotary shaft 15 and the vacuum heat insulating portion 21. Since it is sandwiched and insulated from the refrigerant, there is no problem such as freezing even if the refrigerant is in an extremely low temperature state.

  Thereby, even when the return refrigerant is used at a temperature of about 100K or less, the magnetic fluid seals 29 to 31, the first seal members 25 and 26, and the second seal members 27 and 28 become inoperable. In addition, since the return refrigerant has an extremely low temperature of 100K or less, it is not necessary to increase the size of the cooling device 14 in order to recool the return refrigerant.

  FIG. 3 is a cross-sectional view showing a main part of a refrigerant supply / discharge device for a superconducting rotating electrical machine according to a third embodiment of the present invention. In FIG. 3, the main difference between the present embodiment and the first and second embodiments is that the refrigerant supply / discharge port from the cooling device 14 to the superconducting rotating electrical machine is connected to the fixed body 34 side and the end plate 35. Located on the side.

  First and second rotary vacuum insulation pipes 32 and 33 are connected to the end of the rotor 1. Each of the first and second rotary vacuum heat insulation pipes 32 and 33 is composed of a double pipe, and has a heat insulation structure in which plugs 32a and 33a are attached between the end portions and the inside is evacuated. ing. The first and second rotary vacuum heat insulating pipes 32 and 33 have different axial lengths and radial dimensions, are coaxially arranged around the rotary shaft center 50, and refrigerants whose inner spaces are described later are provided. And is communicated with the interior of the rotor 1.

  On the outer peripheral side of the rotary vacuum insulation pipe 32.33, a vacuum insulation rotary shaft 35 connected to the end of the rotor 1 is provided. The vacuum heat insulating rotary shaft 35 is composed of a double tube and has a heat insulating structure in which the inside is evacuated. The vacuum heat insulating rotary shaft 35 is provided with a refrigerant flow hole 35a, and a bellows structure portion 35b is provided on the inner peripheral surface of the tip (left side in the figure). A pair of ends are spaced apart in the axial direction so that the bellows structure portion 35b is sandwiched between the front end portion of the vacuum heat insulation rotary shaft 35 and the outer peripheral surface of the front end portion of the first rotary vacuum heat insulation pipe 32. The plates 36 and 37 are fixed in an airtight manner, and a space between the pair of end plates 36 and 37 is a heat insulating structure in which a vacuum is drawn.

  A cross section having an internal vacuum structure between the inner peripheral surface of the vacuum heat insulating rotary shaft 35 and the outer peripheral surface of the open end portion of the second rotary vacuum heat insulating pipe 33 positioned closer to the rotor 1 than the end plate 37. A box-shaped pipe support 38 is arranged in an airtight manner over the entire circumference, and the pipe support 38 blocks the space on both sides in the axial direction and is insulated. Thereby, the internal space of the second rotary vacuum heat insulating pipe 33 communicates with the space surrounded by the end plate 37 and the pipe support 38 and further communicates with the refrigerant circulation hole 35a.

  A cylindrical fixed body 34 is provided on the outer periphery of the vacuum heat insulating rotary shaft 35. Bearings 39 and 39 are provided between both ends of the fixed body 34 and the vacuum heat insulating rotary shaft 35, respectively, and the vacuum heat insulating rotary shaft 35 is rotatable to the fixed body 34 via the bearings 39 and 39. It is supported. The fixed body 34 is provided with a vacuum heat insulating portion 40 having a double-pipe structure on the inner peripheral surface located between the pair of bearings 39. Further, the fixed body 34 is provided with a refrigerant circulation hole 34a and first and second vacuuming ports 34b and 34c.

  The refrigerant circulation hole 34a is opened so that the inner peripheral side opening portion of the fixed body 34 passes through the vacuum heat insulating portion 40 and faces the refrigerant flow hole 35a in the vacuum heat insulating rotating shaft 35, and the outer peripheral side opening portion is formed. The cooling device 14 communicates with the piping 14e. Further, one or a plurality of sealing members 41, 42 made of a fluororesin having cold resistance or the like are provided between the vacuum heat insulating portion 40 and the vacuum heat insulating rotating shaft 35 located on both sides of the refrigerant flow hole 34a. Individually installed. The first and second evacuation ports 34b and 34c are provided on the side of the anti-refrigerant circulation hole 34a of the seal members 41 and 42.

  The opening on the inner peripheral side of the first evacuation port 34b is located on the side of the anti-refrigerant flow hole 34a of the seal member 41, passes through the vacuum heat insulating part 39, and between the vacuum heat insulating part 40 and the vacuum heat insulating rotating shaft 35. It is open to the space. The opening on the inner peripheral side of the second evacuation port 34c is located on the side of the anti-refrigerant flow hole 34a of the seal member 42 and penetrates the vacuum heat insulating part 40 between the vacuum heat insulating part 40 and the vacuum heat insulating rotary shaft 35. It is open to the space.

  In the space between the vacuum heat insulating portion 40 and the vacuum heat insulating rotary shaft 35 facing the inner peripheral side opening of each vacuum suction port 34b and 34c, the vacuum suction ports 34b and 34c are respectively sandwiched on both sides thereof. A pair of magnetic fluid seals 43 and 44 are provided, and these spaces are evacuated by a vacuum pump connected to each of the evacuation ports 34b and 34c.

  An end plate 45 is airtightly attached to the left end of the fixed body 34 in the figure, and a fixed vacuum heat insulating pipe 46 is provided through the end plate 45. The fixed vacuum heat insulating pipe 46 is also composed of a double pipe and has a heat insulating structure in which the inside is evacuated. The fixed vacuum heat insulation pipe 46 is coaxially arranged around the rotation axis center 50, and a tip opening (open end) thereof extends toward the rotor 1, and enters the internal space of the first rotary vacuum heat insulation pipe 32. It arrange | positions so that it may be located. The fixed vacuum heat insulation pipe 46 communicates with the cooling device 14 via a pipe 14 f so that the refrigerant of the cooling device 14 can be supplied to and discharged from the rotor 1 via the first rotary vacuum heat insulation pipe 32. It has become.

  In the refrigerant supply / discharge device of the superconducting rotating electrical machine configured as described above, the refrigerant supply / discharge port of the cooling device 14 is formed in each of the fixed body 34 and the end plate 45, and the refrigerant of the cooling device 14 is, for example, a solid line arrow 55. As shown in FIG. 2, the refrigerant passes through the space between the end plate 37 and the pipe support 38 from the refrigerant circulation hole 34a, and is further supplied into the rotor 1 through the internal space of the second rotary vacuum heat insulating pipe 33. The return refrigerant from the inside passes through the inside of the first rotary vacuum insulation pipe 32 and is further collected through the inside of the fixed vacuum insulation pipe 46.

  As a modification, on the contrary to the above, as indicated by a dotted arrow 56, the refrigerant of the cooling device 14 passes through the inside of the fixed vacuum insulation pipe 46 and further through the inside of the first rotary vacuum insulation pipe 32. The refrigerant returned from the inside of the rotor 1 is passed through the inside of the second rotary vacuum heat insulating pipe 33 and further through the space between the end plate 37 and the pipe support 38, and the refrigerant circulation hole 34a. It can also be configured to collect through.

  Therefore, according to the present embodiment, the refrigerant flow path is surrounded by the vacuum heat insulation layers such as the first and second rotary vacuum heat insulation pipes 32 and 33, the vacuum heat insulation rotary shaft 35, the end plate 37 and the pipe support 38. Thus, it is possible to suppress the phenomenon that the refrigerant exchanges heat with the outside, and the supply refrigerant and the recovered refrigerant exchange heat. In addition, the space between the vacuum heat insulating portion 40 and the vacuum heat insulating rotating shaft 35 formed by the magnetic fluid seals 43 and 44 is always maintained in a vacuum state, so that heat from the outside is on the seal member 41 and 42 side. Can be prevented from entering. In addition, the magnetic fluid seals 43 and 44 are not in contact with the refrigerant due to the presence of the seal members 41 and 42, and the inner and outer peripheries are sandwiched between the vacuum heat insulating rotary shaft 35 and the vacuum heat insulating portion 40 to be insulated from the refrigerant. Even if the temperature is extremely low, there will be no problems such as freezing.

  Thus, even when the return refrigerant is used at a temperature of about 100K or less, the magnetic fluid seals 43 and 44 and the seal member 41.42 are not inoperable, and the return refrigerant is not more than 100K. Due to the low temperature, there is no need to increase the size of the cooling device 14 in order to recool the return refrigerant.

It is a longitudinal cross-sectional view which shows the upper half main part of the refrigerant | coolant supply / discharge apparatus of the superconducting rotary electric machine which concerns on 1st Embodiment by this invention. It is a longitudinal cross-sectional view which shows the upper half main part of the refrigerant | coolant supply / discharge apparatus of the superconducting rotary electric machine which concerns on 2nd Embodiment by this invention. It is a longitudinal cross-sectional view which shows the upper half main part of the refrigerant | coolant supply / discharge apparatus of the superconducting rotary electric machine which concerns on 3rd Embodiment by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotor 2, 22, 32 ... 1st rotation vacuum heat insulation piping 3, 23, 33 ... 2nd rotation vacuum heat insulation piping 2a, 3a, 12a, 15a, 22a, 23a, 32a, 33a ... Plug body 4, 24, 34 ... fixed bodies 5, 20, 39 ... bearing 6 ... fixed shafts 7, 21, 40 ... vacuum heat insulating part 8 ... seal member (second seal member)
9, 29 to 31, 43, 44 ... Magnetic fluid seals 10, 24c, 24d, 24e, 34b, 34c ... Vacuum suction port 11 ... Permanent magnet 12, 46 ... Fixed vacuum insulation pipe 13 ... Seal member (first seal member) )
14 ... Cooling devices 14a to 14f ... Pipings 15, 35 ... Vacuum heat insulating rotary shafts 15b, 24a ... First refrigerant circulation holes 15c, 24b ... Second refrigerant circulation holes 15d, 35b ... Bellows structures 16, 17, 36, 37, 45 ... end plate 18 ... first pipe support 19 ... second pipe support 25, 26 ... first seal member 27, 28 ... second seal member 35a ... refrigerant flow hole 38 ... pipe support 41, 42 ... Seal member

Claims (9)

A first rotary vacuum heat insulating pipe provided at an end of the rotor, coaxially disposed at the center of the rotation axis, and having an inner space communicating with the interior of the rotor;
A second rotary vacuum heat insulation pipe disposed coaxially on the outer peripheral side of the first rotary vacuum heat insulation pipe and having an inner space communicating with the interior of the rotor;
A fixed body that is provided on the outer peripheral side of the second rotary vacuum heat insulation pipe and rotatably supports the second rotary vacuum heat insulation pipe via a bearing;
A fixed shaft connected to the side of the fixed body and provided on the outer peripheral side of the end of the second rotary vacuum heat insulating pipe, and having a vacuum heat insulating part formed on the inner peripheral surface;
A fixed vacuum heat insulation pipe provided on the inner peripheral side of the first rotary vacuum heat insulation pipe and having an open end positioned in the first rotary vacuum heat insulation pipe;
A first seal member made of a cold-resistant material that seals between the fixed vacuum heat insulation pipe and the first rotary vacuum heat insulation pipe;
A second seal member made of a cold-resistant material that seals between the second rotary vacuum heat insulation pipe and the vacuum heat insulation portion of the fixed shaft;
Between the second rotary vacuum heat insulating pipe and the vacuum heat insulating portion of the fixed shaft, located on the bearing side of the second seal member and sandwiching a vacuum suction port provided on the fixed shaft A magnetic fluid seal provided on both sides thereof;
A refrigerant that is provided outside the fixed shaft and communicates between the second rotary vacuum heat insulating pipe and the vacuum heat insulating portion of the fixed shaft and to the internal space of the fixed vacuum heat insulating pipe to cool the rotor. A cooling device to supply and recover;
A refrigerant supply / discharge device for a superconducting rotating electrical machine.   The refrigerant passes between the fixed vacuum heat insulating pipe and the vacuum heat insulating portion of the fixed shaft, and is further supplied to the rotor through the first and second rotary vacuum heat insulating pipes. The refrigerant supply / exhaust device for a superconducting rotary electric machine according to claim 1, wherein the return refrigerant from the inside of the superconducting rotary electric machine is collected through the first rotary vacuum insulation pipe and further through the fixed vacuum insulation pipe.   The refrigerant passes through the fixed vacuum heat insulation pipe and is further supplied to the rotor through the first rotary vacuum heat insulation pipe, and the return refrigerant from the rotor passes through the first and second rotations. The refrigerant supply / discharge device for a superconducting rotating electrical machine according to claim 1, wherein the refrigerant is recovered through the vacuum heat insulating pipe and further between the fixed vacuum heat insulating pipe and the vacuum heat insulating portion of the fixed shaft. A first rotary vacuum heat insulating pipe provided at an end of the rotor, coaxially disposed at the center of the rotation axis, and having an inner space communicating with the interior of the rotor;
A second rotary vacuum heat insulation pipe disposed coaxially on the outer peripheral side of the first rotary vacuum heat insulation pipe and having an inner space communicating with the interior of the rotor;
The second rotary vacuum heat insulation pipe is coaxially arranged on the outer peripheral side of the second rotary vacuum heat insulation pipe, and the inner space communicates with the inside of the rotor and has a space at the tip. A pair of end plates is fixed, a space between the pair of end plates is evacuated, and a vacuum heat insulating rotary shaft having a bellows structure portion formed on the inner peripheral surface of the tip portion;
A first pipe support disposed between the first rotary vacuum heat insulation pipe and the vacuum heat insulation rotary shaft to block and insulate the space on both axial sides;
A second pipe support disposed between the second rotary vacuum heat insulation pipe and the vacuum heat insulation rotary shaft to block and insulate the space on both axial sides;
A fixed body that rotatably supports the vacuum heat insulating rotary shaft via a pair of bearings, and is provided with a vacuum heat insulating portion on an inner peripheral surface located between the pair of bearings;
A first coolant circulation hole formed through the fixed body, the vacuum heat insulating portion and the vacuum heat insulating rotating shaft, and communicated with a space between the end plate and the first pipe support;
A second refrigerant flow hole formed through the fixed body, the vacuum heat insulating portion and the vacuum heat insulating rotating shaft, and communicated with a space between the first and second pipe supports;
A first seal member made of a cold-resistant material installed in a space between the vacuum heat insulation rotating shaft located on both sides of the first refrigerant circulation hole and the vacuum heat insulation portion of the fixed body. When,
A second seal member made of a cold-resistant material installed in a space between the vacuum heat insulation rotary shaft located on both sides of the second refrigerant circulation hole and the vacuum heat insulation portion of the fixed body. When,
A pair of magnetic fluid seals respectively installed in a space between the vacuum heat insulation rotary shaft and the vacuum heat insulation portion of the fixed body located on the side of the first and second seal members on the side opposite to the refrigerant flow hole;
A vacuuming port formed through the fixed body and the vacuum heat insulating portion so as to communicate with a space between each pair of magnetic fluid seals;
A cooling device that communicates with the first and second refrigerant flow holes via a pipe to supply and recover the refrigerant that cools the rotor;
A refrigerant supply / discharge device for a superconducting rotating electrical machine.   The refrigerant passes between the end plate and the first pipe support through the first refrigerant circulation hole, and is further supplied to the inside of the rotor through the first rotary vacuum heat insulating pipe. The return refrigerant from the inside passes through between the first and second rotary vacuum insulation pipes, passes between the first and second pipe supports, and is recovered through the second refrigerant circulation hole. The refrigerant supply / discharge device for a superconducting rotating electrical machine according to claim 4.   The refrigerant passes between the first and second pipe supports from the second refrigerant circulation hole, and is further supplied to the inside of the rotor through the first and second rotary vacuum heat insulating pipes. The return refrigerant from the inside of the rotor passes through the first rotary vacuum insulation pipe, passes between the end plate and the first pipe support, and is collected through the first refrigerant circulation hole. The refrigerant supply / discharge device for a superconducting rotating electrical machine according to claim 4. A first rotary vacuum heat insulating pipe provided at an end of the rotor, coaxially disposed at the center of the rotation axis, and having an inner space communicating with the interior of the rotor;
A second rotary vacuum heat insulation pipe disposed coaxially on the outer peripheral side of the first rotary vacuum heat insulation pipe and having an inner space communicating with the interior of the rotor;
Provided at the end of the rotor, and arranged coaxially with the second rotary vacuum heat insulation pipe on the outer peripheral side of the second rotary vacuum heat insulation pipe, the inner peripheral surface of the tip and the first rotation A pair of end plates are fixed between the vacuum insulation pipes with an interval in the axial direction, a space between the pair of end plates is evacuated, and a bellows structure portion is formed on the inner peripheral surface of the tip portion. A vacuum insulated rotating shaft,
A pipe support that is disposed between the second rotary vacuum heat insulation pipe and the vacuum heat insulation rotary shaft and blocks and insulates the space on both axial sides;
A fixed body that rotatably supports the vacuum heat insulating rotary shaft via a pair of bearings, and is provided with a vacuum heat insulating portion on an inner peripheral surface located between the pair of bearings;
Refrigerant flow holes formed through the fixed body and the vacuum heat insulating portion and the vacuum heat insulating rotating shaft, and communicated with a space between the end plate and the pipe support;
A seal member made of a cold-resistant material installed in a space between the vacuum heat insulation rotary shaft located on both sides of the refrigerant flow hole and the vacuum heat insulation portion of the fixed body;
A pair of magnetic fluid seals respectively installed in a space between the vacuum heat insulating rotating shaft and the vacuum heat insulating portion of the fixed body located on the anti-refrigerant circulation hole side of these seal members;
A vacuuming port formed through the fixed body and the vacuum heat insulating portion so as to communicate with a space between each pair of magnetic fluid seals;
Provided on the inner peripheral side of the first rotary vacuum heat insulation pipe, provided through an end plate attached to the end of the fixed body, and an open end thereof in the first rotary vacuum heat insulation pipe Fixed vacuum insulation piping located,
A cooling device that supplies the refrigerant that cools the rotor by communicating with the fixed vacuum heat insulating pipe and the refrigerant circulation hole via the pipe, and collects the refrigerant;
A refrigerant supply / discharge device for a superconducting rotating electrical machine.   The refrigerant passes between the end plate and the pipe support from the refrigerant flow hole, and is further supplied to the inside of the rotor through the first and second rotary vacuum heat insulating pipes. The refrigerant supply / discharge device for a superconducting rotating electrical machine according to claim 7, wherein the return refrigerant from the inside passes through the first rotary vacuum heat insulation pipe and is further collected through the fixed vacuum heat insulation pipe.   The refrigerant passes through the fixed vacuum heat insulation pipe and is further supplied between the first rotary vacuum heat insulation pipes and into the rotor, and the return refrigerant from the rotor includes the first and second refrigerants. The refrigerant supply / discharge device for a superconducting rotating electrical machine according to claim 7, wherein the refrigerant is recovered through the refrigerant flow hole through the rotary vacuum insulation pipe, further between the end plate and the pipe support. .

Images