JPS63110954A - Superconducting rotor - Google Patents

Abstract

PURPOSE:To facilitate work at the time of assembling, by setting a link mechanism absorbing thermal transformation in the axial direction of an inner cylinder. CONSTITUTION:So far as a superconducting rotor is concerned, an external cylinder 3 is connected to a pair of joint shafts 2 forming the side surface of the rotor and the shafts, and the outer periphery of the rotor is formed. In the internal section of the external cylinder 3, an internal cylinder 6 which is set concentrically with the cylinder 3 having a radiation shield and superconducting field windings dipped in the liquid helium of a refrigerant and fitted on the inner periphery is set. In this case, on the same circumferences with the center of respective rotor cores on the end sections of the internal cylinder 6 and the end surfaces of the joint shafts 2, hinges 7a, 7b are arranged relatively and equally, and connecting members 8a, 8b connected rotatably to a ring 9 are connected rotatably to the hinges 7a, 7b respectively. Then, a flexible support is not needed, and the external cylinder 3 and the joint shafts 2 can be directly connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a superconducting rotor, and particularly to a superconducting rotor in which a means for connecting an inner cylinder and an outer cylinder is improved.

(Prior Art) A conventional superconducting rotor will be described with reference to FIG. 6. Reference numerals 1 and 2 are a pair of joint shafts forming the side surfaces and shaft of the superconducting rotor. An outer cylinder 3 is connected between the joint shafts 1 and 2, and this outer cylinder 3 forms the outer periphery of the rotor. Moreover, inside this outer cylinder 3, it is concentric with this outer cylinder 3, has a radiation shield 4 on its outer periphery, and is immersed in liquid helium, which is a refrigerant, so as to maintain an extremely low temperature on its inner periphery. An inner cylinder 6 is provided with a superconducting field winding 5 mounted thereon. Note that one end of this inner cylinder 6 is connected to the joint shaft 1.
The other end is connected between the joint shaft 2 and the outer cylinder 3 via a flexible support 10 whose axial cross section is U-shaped. That is, it has a triple structure in which three members, the end of the outer cylinder 3, the outer circumference of the flexible support 10, and the outer circumference of the joint shaft 2, are fastened with through bolts.

As described above, the superconducting rotor has a double cylindrical structure consisting of an outer cylinder 3 and an inner cylinder 6, makes the inside of the outer cylinder 3 a vacuum, protects the extremely low temperature inner cylinder 6 from heat inflow from the outside, and The inner cylinder 6 connects the outer cylinder 3 at both ends to maintain the position and mutually transmit torque. In addition, the flexible support can absorb thermal contraction of the inner cylinder 6 only in the axial direction.
It is made of

(Problems to be Solved by the Invention) As described above, the flexible support has been conventionally used as a mechanism for allowing thermal deformation of the inner cylinder 6 in the axial direction and restraining displacement in other directions. Machining of complex shapes, assembly work inside the inner cylinder 6 and outer cylinder 3. There were problems with the fM construction, such as the triple structure in which the three members, the flexible support 10 and the joint shaft 2, were passed through and fastened with bolts. Furthermore, due to the increase in the size of the rotor, the weight and amount of thermal deformation of the inner cylinder 6 increases, and in order to withstand the load of the inner cylinder 6, it is necessary to increase the thickness of the flexible support 10. In order to absorb thermal deformation in the axial direction, the plate thickness must be reduced, and selection of the plate thickness is difficult, which limits the scale of application of the flexible support 10.

The present invention provides a superconducting rotor that has the function of absorbing thermal deformation in the axial direction of the inner cylinder, does not require complicated machining, facilitates work during manufacturing and assembly, and is applicable to large-capacity machines. The purpose is to

[Structure of the invention]

(Means for Solving the Problems) In the present invention, in order to achieve the above-mentioned object, the first
Use a link mechanism as shown in the figure.

That is, the end of the inner cylinder 6 and the end surface of the connecting shaft 2 are connected by hinges 7a, 7b equally spaced on the circumference and connecting members 8a, 8b rotatably connected to the hinges.

(Function) With this structure, the inner cylinder can expand and contract significantly in the axial direction while being held concentrically inside the outer cylinder.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a sectional view showing a schematic structure of a superconducting rotor according to the present invention.

A hinge 7a is provided at the end of the inner cylinder 6 and the end face of the joint shaft 2, respectively, on the same circumference centered on the rotor center.
, 7b are equally spaced, and connecting members 8a and 8b rotatably connected to the ring 9 are rotatably connected to the hinges 7a and 7b, respectively. In FIG. 1, the parts of the superconducting rotor that are not shown are the same as the conventional structure shown in FIG. 6, so they are omitted. FIG. 2 is a perspective view showing the arrangement of connecting members 8a, 8b and ring 9 attached to inner cylinder 6 via hinge 7a.

Next, the effect will be explained. As the superconducting winding 5 is cooled to an extremely low temperature, the temperature of the inner cylinder 6 that holds the superconducting winding 5 also decreases, causing thermal deformation. The hinge 7a absorbs the axial contraction of the inner cylinder 6 due to this thermal deformation.

7b and the connecting members 8a, 8b, the link mechanism restricts movement of the inner cylinder 6 in the radial direction and rotational direction while allowing the movement. That is, in FIG. 3, the solid line represents the state at room temperature and the broken line represents the state when cooled, but the connection between the connecting members 8a and 8b and the hinge 7
Since the connections with a and 7b are rotatable, this link mechanism does not hinder the deformation of the inner cylinder 6 in the axial direction. but,
Since the other end of the inner cylinder 6, which is not shown in FIG. 3, is fixed, the link mechanism restrains the inner cylinder 6 from deforming in the radial direction. Further, in the circumferential direction, the connecting members 8a and 8b are hinges 7a.

Since it can be regarded as a beam member rigidly connected to the cylinder 6
rotation in the axial direction is restricted. Furthermore, when the inner cylinder 6 heat-shrinks, the ring 9 expands its diameter as the connecting members 8a, 8b move and applies tension to the connecting members 8a, 8b, thereby restraining the rotation of the cylinder 5 in the radial direction. Add.

As described above, in the superconducting rotor according to the present invention, the inner cylinder 6 is allowed to shrink in the axial direction due to the cryogenic temperature caused by the refrigerant that cools the superconducting winding 5, but is restrained from deforming in other directions. Furthermore, compared to the conventional structure, there is no need for a flexible support, so the outer cylinder 3 and joint shaft 2 can be directly connected, which avoids manufacturing difficulties such as connection work, and It is also possible to handle larger sizes.

Other embodiments of the present invention will be described below with reference to FIGS. 4 and 5. In the embodiment shown in FIG.
The fulcrums of a and 8b are arranged on the outer peripheral side of the hinges 7a and 7b provided on the inner cylinder 6 and the connecting shaft 2. Further, the embodiment shown in FIG. 5 has three connecting members 8a, 8
b, 8c and double rings 9a, 9b form a double-row link mechanism, and can cope with larger thermal deformation of the inner cylinder 6.

〔Effect of the invention〕

According to the present invention, the temperature of the inner cylinder is brought to an extremely low temperature by the refrigerant in which the superconducting winding is immersed, the thermal deformation in the axial direction of the half-inner cylinder is absorbed, and the position of the inner cylinder is maintained, and the position of the inner cylinder is maintained during manufacturing and assembly work. This makes it easy to use and can be applied to large-capacity machines.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the superconducting rotor of the present invention, FIG. 2 is a partial perspective view of the above embodiment, FIG. 3 is an explanatory diagram of the operation of the above embodiment, and FIGS. The figures are longitudinal sectional views showing other embodiments of the present invention, and FIG. 6 is a longitudinal sectional view showing a conventional superconducting rotor. 1.2... Joint shaft 3... Outer tube 4... Radiation shield 5... Superconducting winding 6... Inner tube 7a, 7b
, 7c... Hinge 8a, 8b, 8cm connection member
9.9a, 9b-ring 10...Flexible support Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A superconducting rotor characterized in that an end face of a joint shaft and an end face of an inner cylinder are connected by a link mechanism.