JP2838013B2 - Superconducting rotating electric machine rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a superconducting rotary electric machine, and more particularly, to a means for expanding and contracting a refrigerant supply pipe and a refrigerant discharge pipe disposed in the rotor.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional view showing an outline of the entire structure of a rotor of a conventional superconducting rotary electric machine, and FIG. 8 is a side view of a refrigerant supply pipe and a refrigerant discharge pipe of the rotor around a bellows.

In FIG. 1, reference numeral 1 denotes a drive-side end shaft to which a rotational driving force is transmitted; and 2, a counter-drive-side end provided with the drive-side end shaft 1 and having a through hole 2b provided therein. Part axis,
Reference numeral 3 denotes one end side fixed to the flange portion 1a of the driving end shaft 1 and the flange portion 2a of the non-driving end shaft 2, respectively, and the driving end shaft 1 side and the non-driving end shaft respectively. A pair of hollow torque tubes having a cooler 3a as a heat exchanger for removing heat input from two sides,
Reference numeral 4 denotes a hollow coil mounting shaft fixed between the pair of torque tubes 3 and in which a liquid reservoir 4a for liquid helium as a refrigerant is formed, and 5 denotes a liquid reservoir 4a of the coil mounting shaft 4.
Is an end plate for sealing both ends.

[0004] 6 is a superconducting field coil wound around the outer surface of the coil mounting shaft 4, 7 is a helium outer cylinder mounted on the coil mounting shaft 4 so as to cover the superconducting field coil 6, 8 is a coil mounting shaft 4 The holding rings 9 attached to both ends of the low temperature damper 9 are supported at both ends by a pair of torque tubes 3 and are provided to cover the helium outer cylinder 7. The torque tube 3 is supported by the flange 1a and the flange 2a of the non-drive end shaft 2.
And a normal temperature damper provided so as to cover the low temperature damper 9, a bearing 11 for rotatably supporting the driving side end shaft 1 and the non-driving side end shaft 2, 12 being supported on the inner surface side of the torque tube 3, A side surface radiation shield 13 provided to cover both side surfaces of the coil mounting shaft 4 is a vacuum section.

A slip ring 14 is provided on the non-drive end shaft 2 for supplying a field current. The slip ring 14 is electrically connected to the superconducting field coil 6 via a current lead (not shown). It is connected to the. Reference numeral 15 denotes a refrigerant supply / discharge rotating member attached to the shaft end of the non-drive-side end shaft 2.
Is a refrigerant supply / discharge fixing member provided so as to surround the refrigerant supply / discharge rotary member 15, and 17 is a refrigerant supplied from the outside via the refrigerant supply / discharge fixing member 16 formed in the coil mounting shaft 4. The refrigerant supply pipe 17 supplies the liquid to the liquid reservoir 4a. The refrigerant supply pipe 17 passes through the through hole 2b of the non-drive end shaft 2 and is connected to the refrigerant supply / discharge rotary member 15 and one side of the coil mounting shaft 4. And one of the end plates 5 provided at the end.

Reference numeral 18 denotes a refrigerant discharge pipe for discharging the refrigerant in the liquid reservoir 4a of the coil mounting shaft 4 to the outside after passing through the cooler 3a of the torque tube 3. An upstream portion 18a disposed between the end plate 5 attached to the cooling device 3 and the cooler 3a of the torque tube 3;
The cooling member supply / discharge rotating member 1 passes through the cooler 3a of the torque tube 3 and the through hole 2b of the non-drive-side end shaft 2 or through the through hole 2b and the liquid reservoir 4a of the coil mounting shaft 4.
5 and a downstream portion 18b disposed between the first and second components. A bellows 19 is mounted in the refrigerant supply pipe 17 and in the downstream portion 18b of the refrigerant discharge pipe 18, and is a bellows as expansion / contraction means for adjusting the amount of expansion / contraction of these pipes 17, 18b in the axial direction. Reference numeral 20 denotes a rotation center axis of the rotor formed by connecting the center axes of the drive side end shaft 1 and the non-drive side end shaft 2.

Next, the operation of the rotor of the superconducting rotating electric machine will be described. When liquid helium, which is a refrigerant, is supplied to the liquid reservoir 4a of the coil mounting shaft 4 via the refrigerant supply / discharge fixing member 16, the refrigerant supply / discharge rotation member 15, and the refrigerant supply pipe 17, the superconducting field coil 6 becomes The liquid helium in the liquid reservoir 4a is cooled down to a very low temperature via the coil mounting shaft 4 and its electric resistance becomes zero. Then, a field current is supplied to the superconducting field coil 6 via the slip ring 14, and when the superconducting field coil 6 is excited, the superconducting field coil 6 in which the electric resistance is zero is applied to the superconducting field coil 6. A strong magnetic field without excitation loss is generated.

In this state, when a rotational force from a turbine (not shown) or the like is transmitted to the drive-side end shaft 1 side, the rotational force is transmitted to the non-drive-side end shaft 2 via the room temperature damper 10 or the like. The drive-side end shaft 1 and the non-drive-side end shaft 2 supported by the bearing 11 rotate in a predetermined direction about the rotation center shaft 20. Then, the torque of the drive-side end shaft 1 and the non-drive-side end shaft 2 is transmitted to the coil mounting shaft 4 via the torque tubes 3 and 3 to rotate the superconducting field coil 6 at a constant speed. Therefore, the rotor that rotates while generating a magnetic field in a predetermined direction generates AC power on the side of a stator (not shown) provided outside the rotor.

Here, the heat transmitted from the driving end shaft 1 and the non-driving end shaft 2 to the coil mounting shaft 4 through the torque tube 3 by heat conduction is transmitted through the cooler 3a to the refrigerant discharge pipe. It is absorbed on the liquid helium (partially gasified in some cases) side in 18. Further, the heat that is to be transmitted by convective heat transfer from the drive-side end shaft 1, the non-drive-side end shaft 2, and the normal temperature damper 10 to the superconducting field coil 6 is cut off by the vacuum unit 13. The heat that is to be transmitted by the radiant heat transfer from the radiator to the superconducting field coil 6 is also blocked by the side surface radiation shield 12 and the low-temperature damper 9.

Further, the normal temperature damper 10 and the low temperature damper 9 have a function of shielding a high frequency magnetic field from the stator to protect the superconducting field coil 6, and attenuating a rotor vibration caused by disturbance of the power system. I have. Further, the bellows 19 absorbs the thermal expansion and contraction caused by the temperature difference between the low-temperature refrigerant supply pipe 17 and the downstream portion 18b of the refrigerant discharge pipe 18 with the rotor components such as the non-drive end shaft 2 at normal temperature. The position where the downstream portion 18b of the refrigerant supply pipe 17 and the refrigerant discharge pipe 18 is shifted from the rotation center axis 20 (Japanese Utility Model Publication No. 57-48788).
No. 2, the centrifugal force acts outward on the bellows 19 as the rotor rotates.

[0011]

Since the rotor of the conventional superconducting rotary electric machine is constituted as described above, the bellows 19 is abnormally deformed by the centrifugal force acting on the same, and the bellows 19 has an expansion and contraction function. There has been a problem that the bellows 19 may be hindered or eventually destroyed. If the bellows 19 is destroyed, the liquid helium as a refrigerant flows out into the vacuum portion 13 and heat infiltration to the coil mounting shaft 4 side increases, so that the operation of the superconducting rotary electric machine itself becomes difficult. turn into.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and abnormal deformation of expansion and contraction means provided in a refrigerant supply pipe and a refrigerant discharge pipe due to its rotation is effectively prevented. It is an object of the present invention to provide a rotor of a superconducting rotating electric machine.

[0013]

According to a first aspect of the present invention, there is provided a driving-side end shaft, a non-driving-side end shaft provided opposite to the driving-side end shaft, and one end of the driving-side end shaft. The other end is fixed to the drive-side end shaft and the other end is fixed to the drive-side end shaft, and a cooler that removes heat input from the counter-drive-side end shaft and the drive-side end shaft. A pair of torque tubes, a coil mounting shaft fixed between the pair of torque tubes and having a liquid reservoir for refrigerant therein, a superconducting field coil wound around the outer surface of the coil mounting shaft, A refrigerant supply pipe that supplies the refrigerant supplied from the anti-drive side end shaft to the liquid reservoir of the coil mounting shaft,
A refrigerant discharge pipe for discharging the refrigerant in the liquid reservoir of the coil mounting shaft after passing through the cooler of the torque tube and then to the outside through the non-drive end shaft; and in the refrigerant discharge pipe and the refrigerant supply pipe And expansion and contraction means for adjusting the amount of expansion and contraction of these pipes in the axial direction. The transmission of the rotational force to the drive side end axis allows the drive side end axis and the non-drive side end axis to be connected to each other. In a rotor of a superconducting rotary electric machine rotated around a rotation center axis connecting the center axes, a refrigerant supply pipe and the refrigerant discharge pipe are bent, and a part of these pipes is positioned at or near the rotation center axis. And the expansion and contraction means of the refrigerant supply pipe and the refrigerant discharge pipe are respectively disposed at this position.

[0014]

[0015]

[0016]

In the rotor of the superconducting rotary electric machine, when refrigerant (liquid helium) is supplied to the liquid reservoir of the coil mounting shaft from the outside via the refrigerant supply pipe, it is wound around the coil mounting shaft. The superconducting field coil to be cooled is cooled, and its electric resistance is maintained in a state of zero (superconducting state). When a current flows through the superconducting field coil, a strong magnetic field is generated. On the other hand, when a rotational force is transmitted from the drive-side end shaft side via a turbine or the like, the drive-side end shaft and the non-drive-side end shaft rotate around the rotation center axis, and are transmitted through the torque tube. The superconducting field coil wound on the coil mounting shaft also rotates. Then, electric power is generated on the stator side outside the rotor.

In this case, heat tends to be transmitted from the drive-side end shaft side to the coil mounting shaft via the torque tube by heat conduction or the like, and this heat is discharged to the outside via the cooler. It is absorbed by the refrigerant inside. In addition, the refrigerant supply pipe and the refrigerant discharge pipe are thermally cooled by the refrigerant, and therefore thermally contract with other members in the axial direction. No stress is applied. Since the refrigerant supply pipe and the refrigerant discharge pipe are rotated with the rotation of the rotor, the expansion / contraction means is also rotated.

According to the first aspect of the present invention, the refrigerant supply pipe and the refrigerant discharge pipe are bent, and a part of these pipes is disposed at or near the rotation center axis. Is provided, the centrifugal force acting on the expansion and contraction means from the rotation center axis is greatly reduced, and abnormal expansion and the like do not occur in the expansion and contraction means.

[0019]

[0020]

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Embodiment 1 FIG. FIG. 1 is a side view of a refrigerant supply pipe and a refrigerant discharge pipe disposed around a bellows disposed in a rotor of a superconducting rotary electric machine according to an embodiment of the first invention of the present invention. In addition,
Except for the positional relationship between the refrigerant supply pipe and the refrigerant discharge pipe, the configuration of the rotor of the superconducting rotary electric machine of the first embodiment is the same as the configuration of the rotor of the superconducting rotary electric machine shown in FIG.

Here, the mounting position of the bellows 19 according to the first embodiment will be described. Through-hole 2 of non-drive-side end shaft 2
b, the refrigerant supply / discharge rotary member 15 and the coil mounting shaft 4
The refrigerant supply pipe 17 disposed between the end plate 5 and the end plate 5 is bent, and a part thereof is positioned at or near the rotation center axis 20 of the rotor. A bellows 19 for adjusting the amount of expansion and contraction of the refrigerant supply pipe 17 in the axial direction is disposed in the refrigerant supply pipe 17 located at or near the rotation center shaft 20. In addition, the non-drive side end shaft 2
Between the coolant supply / discharge rotary member 15 and the end plate 5 attached to the coil mounting shaft 4 through the through hole 2b or through the through hole 2b and the liquid reservoir 4a of the coil mounting shaft 4. The downstream portion 18b of the disposed refrigerant discharge pipe 18 (hereinafter referred to as the downstream refrigerant discharge pipe 18b) is bent, and a part thereof is positioned at or near the rotation center axis 20 of the rotor. A bellows 19 for adjusting the amount of expansion and contraction of the downstream refrigerant discharge pipe 18b in the axial direction is provided in the downstream refrigerant discharge pipe 18b located at or near the position of the rotation center shaft 20. At this time, the bellows 19 provided in the refrigerant supply pipe 17 and the downstream refrigerant discharge pipe 18b respectively.
Are arranged so as not to interfere with each other by shifting their axial positions.

Next, the operation of the bellows 19 provided at or near the position of the rotation center shaft 20 will be described.
When the operation of the rotor of the superconducting rotating electric machine is started,
The refrigerant supply pipe 17 and the downstream-side refrigerant discharge pipe 18b allow the cryogenic liquid helium or the partially gasified liquid helium as a refrigerant to flow therein, so that the refrigerant is supplied to the non-drive end shaft 2 and the room temperature damper 10. In this case, the bellows 19 expands and the refrigerant supply pipe 17 and the downstream refrigerant discharge pipe 18
b should be free from thermal stress.

When the rotor rotates, the internal refrigerant supply pipe 17 and the downstream refrigerant discharge pipe 18b also rotate, so that the bellows 19 attached to these also rotate. In this case, since the bellows 19 is disposed at or near the position of the rotation center shaft 20, the centrifugal force acting on the bellows 19 due to the deviation from the rotation center shaft 20 is greatly reduced. Therefore, the bellows 19 does not undergo abnormal deformation due to the centrifugal force, and does not hinder its expansion and contraction function and its destruction caused by the abnormal deformation. Further, heat is transmitted to the coil mounting shaft 4 and the superconducting field coil 6 side due to the destruction of the bellows 19, so that the operation of the superconducting rotary electric machine does not become difficult.

Although only one downstream-side refrigerant discharge pipe 18b is shown in the first embodiment, the bellows 19 may be similarly provided for the other downstream-side refrigerant discharge pipes 18b.

Embodiment 2 FIG. FIG. 2 is a cross-sectional view around a bellows of a refrigerant supply pipe and a refrigerant discharge pipe disposed in a rotor of a superconducting rotary electric machine according to one embodiment of the second invention of the present invention. In the drawing, reference numeral 30 denotes a refrigerant pipe as a multiple pipe in which a part of the refrigerant supply pipe 17 and the downstream-side refrigerant discharge pipe 18b has a double-pipe structure, which is disposed at or near the rotation center axis 20. For example, the outer pipe is the downstream refrigerant discharge pipe 1
8b, the inner pipe of which is the refrigerant supply pipe 17. The inner and outer pipes of the refrigerant pipe 30 are respectively provided for the refrigerant supply pipe 17 and the downstream refrigerant discharge pipe 18.
The bellows 19 for b is attached. The other configuration is the same as the rotor of the superconducting rotary electric machine of the first embodiment.

Also in the second embodiment, the rotation center shaft 20
Since the bellows 19 for the refrigerant supply pipe 17 and the downstream refrigerant discharge pipe 18b are respectively attached to the inner and outer pipes of the double pipe structure refrigerant pipe 30 located at or near the position of Even when the refrigerant supply pipe 17 and the downstream-side refrigerant discharge pipe 18b rotate, the centrifugal force acting on the bellows 19 due to the deviation from the rotation center shaft 20 is greatly reduced. The same effect as that of the rotator can be obtained. Further, the bellows 19 is attached to the refrigerant pipe 30 having a double pipe structure, but does not cause any obstacle to its expansion and contraction function and the function of passing the refrigerant. In the case of the second embodiment, in particular, the first embodiment
, The refrigerant supply pipe 17 and the downstream-side refrigerant discharge pipe 1
There is an advantage that it is not necessary to bend the 8b, and the pipe is easily supported against centrifugal force.

Although only one downstream-side refrigerant discharge pipe 18b is shown in the second embodiment, for the other downstream-side refrigerant discharge pipes 18b, the refrigerant pipe 30 may be a triple pipe,
What is necessary is just to cope by integrating the downstream-side refrigerant discharge pipes 18b.

Embodiment 3 FIG. FIG. 3 is a longitudinal sectional view of a refrigerant supply pipe and a downstream refrigerant discharge pipe arranged around a bellows disposed in a rotor of a superconducting rotary electric machine according to an embodiment of the third invention of the present invention, and FIG. FIG. 4 is a sectional view taken along line IV-IV of FIG.

In the figure, reference numeral 31 denotes a through hole 31a through which the refrigerant supply pipe 17 and the downstream refrigerant discharge pipe 18b are inserted. The outer surface of the through hole 31a is fitted into the inner hole 12a of the side radiation shield 12, for example. It is a support member as a thick disk-shaped support means supported by the radiation shield 12. The bellows of the refrigerant supply pipe 17 and the downstream refrigerant discharge pipe 18b are positioned and supported in the through hole 31a of the support member 31. The other configuration is the same as the rotor of the superconducting rotary electric machine of the first embodiment.

Refrigerant supply pipe 17 and downstream refrigerant discharge pipe 1
8b is located at a certain distance from the rotation center axis 20 of the rotor, and therefore, the bellows 19 attached to the refrigerant supply pipe 17 and the downstream refrigerant discharge pipe 18b are respectively attached to the bellows 19 as the rotor rotates. Centrifugal force due to the displacement acts. However, this bellows 19 is
Since the outer surface of the bellows 19 is located in the through hole 31a and supported by the support member 31, even if a centrifugal force acts on the bellows 19, the bellows 19 does not undergo abnormal deformation. Therefore, also in the third embodiment, the same effects as those of the rotor of the superconducting rotary electric machine of the first embodiment can be obtained. In this case, the bellows 19 is supported by the support member 31.
Is freely movable in the axial direction in the through hole 31a, and there is no problem in its expansion / contraction function. Particularly, in the third embodiment,
The superconducting rotary electric machine of the third embodiment has an advantage that the arrangement positions of the refrigerant supply pipe 17 and the downstream-side refrigerant discharge pipe 18b can be set freely, and the degree of freedom of installation is high, as compared with those of the first and second embodiments.

The supporting member 31 is connected to the side surface radiation shield 1.
Not only is it supported on the torque tube 3 via
The support member 31 may be supported by another support member attached to the torque tube 3.

Embodiment 4 FIG. FIG. 5 is a vertical cross-sectional view of a refrigerant supply pipe and a downstream refrigerant discharge pipe disposed around a bellows disposed in a rotor of a superconducting rotary electric machine according to another embodiment of the third invention of the present invention, and FIG. It is sectional drawing along the VI-VI line of No. 5.

In the drawing, reference numeral 32 denotes a support attached to the bellows 19 for supporting the side surfaces of the bellows 19 of the refrigerant supply pipe 17 and the downstream refrigerant discharge pipe 18b at positions deviated from the rotation center shaft 20. It is a support member as a means. The support member 31 is provided only on the side of the bellows 19 on which the centrifugal force acts.
Are positioned so as to be in contact with the inner surface of the inner hole 12 a of the side surface radiation shield 12, and are supported by the side surface radiation shield 12. Here, the support member 31 is attached to a position on the outer peripheral surface of the bellows 19 where the expansion and contraction function of the bellows 19 is not hindered, for example, by welding or the like.

When a centrifugal force acts on the bellows 19, the support member 32 can also support the bellows 19 so that abnormal deformation does not occur. Obtainable. In this case, the support member 32 is smaller than the support member 31 of the third embodiment and has a simple structure, so that the cost is low and the mounting operation is simple. In addition,
In addition to supporting the support member 32 on the torque tube 3 via the side surface radiation shield 12, the support member 32 may be supported by another support member attached to the torque tube 3.

[0036]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, the driving-side end shaft, the non-driving-side end shaft provided opposite to the driving-side end shaft, and one end of the driving-side end shaft are connected to the non-driving-side end shaft. A pair of end shafts, each having the other end fixed to the driving end shaft, and having a cooler for removing heat input from the non-driving end shaft and the driving end shaft. A torque tube, a coil mounting shaft fixed between the pair of torque tubes and having a liquid reservoir for refrigerant therein, a superconducting field coil wound around the outer surface of the coil mounting shaft, and supplied from outside. A refrigerant supply pipe for supplying the refrigerant to the liquid reservoir of the coil mounting shaft through the inside of the end shaft on the anti-drive side, and the refrigerant in the liquid reservoir of the coil mounting shaft passes through the cooler of the torque tube, and then is driven in the opposite direction. A refrigerant discharge pipe that passes through the inside of the side end shaft and discharges to the outside; Attached to the discharge pipe and the refrigerant supply pipe, respectively, provided with expansion and contraction means for adjusting the amount of expansion and contraction of these pipes in the axial direction, and by transmitting the rotational force to the drive side end axis, this drive side end axis and In a rotor of a superconducting rotary electric machine that is rotated around a rotation center axis connecting a center axis with an anti-drive side end axis, a refrigerant supply pipe and the refrigerant discharge pipe are bent, and a part of these pipes is rotated. Since the expansion and contraction means of the refrigerant supply pipe and the refrigerant discharge pipe are respectively disposed at the position of the central axis or a position near the center axis, the expansion and contraction means provided in the refrigerant supply pipe and the refrigerant discharge pipe are provided. The centrifugal force due to the deviation from the rotating center axis that acts is greatly reduced, and abnormal deformation or the like due to the centrifugal force does not occur in the expansion / contraction means.

[0038]

[0039]

[Brief description of the drawings]

FIG. 1 is a side view around a bellows of a refrigerant supply pipe and a refrigerant discharge pipe disposed in a rotor of a superconducting rotary electric machine according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view around a bellows of a refrigerant supply pipe and a refrigerant discharge pipe provided in a rotor of a superconducting rotary electric machine according to Embodiment 2 of the present invention.

FIG. 3 is a longitudinal sectional view of a refrigerant supply pipe and a refrigerant discharge pipe around a bellows disposed in a rotor of a superconducting rotary electric machine according to Embodiment 3 of the present invention.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a longitudinal sectional view of a refrigerant supply pipe and a refrigerant discharge pipe disposed around a bellows disposed in a rotor of a superconducting rotary electric machine according to Embodiment 4 of the present invention.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a cross-sectional view illustrating an outline of an entire configuration of a rotor of a conventional superconducting rotary electric machine.

FIG. 8 is a side view around a bellows of a refrigerant supply pipe and a refrigerant discharge pipe of a rotor of a conventional superconducting rotary electric machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive side end shaft 2 Non-drive side end shaft 3 Torque tube 3a Cooler 4 Coil mounting shaft 6 Superconducting field coil 17 Refrigerant supply pipe 18 Refrigerant discharge pipe 18b Downstream refrigerant discharge pipe (refrigerant discharge pipe) 19 Bellows ( Expansion / contraction means 20 rotation center axis 30 refrigerant pipe (multiple pipe) 31 support member (support means) 32 support member (support means)

Claims (1)

(57) [Claims] 1. A driving-side end shaft, a non-driving-side end shaft provided to face the driving-side end shaft, one end of the driving-side end shaft and the other end of the driving-side end shaft. A pair of torque tubes each fixed to the drive side end shaft and having a cooler for removing heat input from the non-drive side end shaft and the drive side end shaft; A coil mounting shaft fixed between the tubes and having a coolant reservoir therein; a superconducting field coil wound around the outer surface of the coil mounting shaft; A refrigerant supply pipe for supplying the liquid storage portion of the coil mounting shaft through the shaft, and a refrigerant in the liquid storage portion of the coil mounting shaft passing through the cooler of the torque tube, and then the counter drive side A refrigerant discharge pipe for discharging through the end shaft to the outside, Telescopic means attached to the refrigerant discharge pipe and the refrigerant supply pipe, respectively, for adjusting the amount of expansion and contraction of these pipes in the axial direction. In a rotor of a superconducting rotary electric machine that is rotated about a rotation center axis connecting a center axis of a unit shaft and the opposite end shaft, the refrigerant supply pipe and the refrigerant discharge pipe are bent, and these pipes are bent. Is disposed at or near the position of the rotation center axis, and the expansion and contraction means of the refrigerant supply pipe and the refrigerant discharge pipe are disposed at this position, respectively. Rotor.