JPS5849077A - Cooler for superconductive rotary electric machine - Google Patents

Abstract

PURPOSE:To improve the cooling of an outer damper by passing cooling air between the interior and the exterior of an outside damper. CONSTITUTION:Cooling air which is inflowed via an inlet filter 18 is shielded by a vent partition plate 14 as designated by an arrow in the drawing, is introduced into a vent duct 16 from an inlet vent hole 15 by the pumping operation of the hole 15 and an outlet vent hole 17, and is exhausted from a vent duct 16 through the hole 17 and an exhaust duct 19. Since the cooling air can pass between interior and the exterior of an outer damper 2 in this manner, the cooling of the damper 2 can be improved, thereby preventing the heating due to wind loss.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for a superconducting rotating electric machine, and in particular, a cooling means is provided for cooling by cooling air flowing in and out through an outer damper, an inlet filter provided on a stator frame, and an exhaust duct. This invention relates to a cooling device for a superconducting rotating electric machine.

A superconducting rotating electric machine, such as a superconducting generator, includes a superconducting rotor equipped with a superconducting field winding, a stator winding arranged at a predetermined gap on an outer damper forming the outer periphery of the superconducting rotor, It consists of a stator core disposed around the outer periphery of the stator winding and a stator core supported by a stator frame. In a superconducting generator constructed in this way, the stator side, that is, the stator windings, stator core, core flange shield, and other heat generating parts are cooled by a liquid cooling medium such as water. Ta. This cooling device for the stator has a very simple structure since it is not necessary to completely circulate a gaseous cooling medium such as air or hydrogen inside the stator.

In contrast, the rotor, especially the outer damper that forms the entire outer circumference of the rotor, is in contact with the air, so its surface is heated by wind damage caused by rotation of the rotor and by current flowing in the event of a system failure. If the heat generated by this heating is not removed to the outside of the superconducting generator, the heat will enter the liquid helium in the rotor, causing destruction of the superconductivity or quenching of the rotor's superconductivity. Furthermore, if this heat is transferred to the stator side, insulation deterioration of the stator windings will be accelerated.

For this reason, in order to improve the cooling of the outer damper and prevent it from heating up due to wind damage, it has been considered to use the wind generated by the rotation of the rotor or to install a blower outside for cooling, but these efforts have not been sufficiently effective. Since there was nothing available, there was a strong desire to develop a cooling device for this purpose.

The present invention has been devised in view of the above points, and its object is to provide a cooling device for a superconducting rotating electrical machine that can effectively cool the outer damper.

That is, the present invention provides a cooling means on the inner diameter side of the stator winding, and a ventilation partition plate that closes the space between the inner diameter side and the outer damper, and a predetermined gap in the axial and circumferential directions between the outer damper and the damper support. It is formed by an inlet ventilation hole and an outlet ventilation hole provided through the damper, and a ventilation duct surrounding the inlet ventilation hole and the outlet ventilation hole and provided on the inner diameter side of the outer damper. The main features are that the cooling air can easily enter, and the exit ventilation hole allows cooling air to exit easily.

The present invention will be explained below based on the illustrated embodiments. 1 to 3 illustrate a practical example of the present invention.

In Figure 1, 1 is the damper support, 2 is the outer damper, and 3
is a stator winding, 4 is an inner cylinder for stator winding (insulator), 5 is an outer cylinder for stator winding (insulator), 6 is stator core, 7 is intermediate duct for stator core, 8 is a stator core flange, 9 is a core flange shield, 10 is a stator winding cooling header, 11 is an intermediate duct cooling header, 12 is a stator frame,
13 is an outlet line, 18 is an inlet filter, 19 is an exhaust duct), and 20.21 is a pedestal f.

In a superconducting generator composed of such components, a cooling means using the cooling air of the outer damper 2 is provided on the inner diameter side of the stator winding 3, and the space between this inner diameter side and the outer damper 2 is closed. A ventilation partition plate 14, an inlet ventilation hole 15 and an outlet ventilation hole 17 provided with a predetermined gap in the axial direction and circumferential direction of the outer damper 2 and the damper support 1,
This is formed by a ventilation duct 16 surrounding the inlet ventilation hole 15 and the exit ventilation hole 17 and provided on the inner diameter side of the outer damper 2. The inlet ventilation holes 15 are designed to allow cooling air to easily enter, and the outlet ventilation holes 17 are designed to allow cooling air to easily exit. That is, the inlet ventilation hole 15 is provided facing the rotation direction P as shown in FIG. 2, and the outlet ventilation hole 17 is provided so as to have a negative pressure with respect to the rotation direction P as shown in FIG. Ta.

By doing this, the cooling air flowing in from the artificial filter 18 is not blocked by the ventilation partition plate 14 as indicated by the arrow in the figure, and the bumping effect between the inlet ventilation hole 15 and the outlet ventilation hole 17 is achieved. Due to the inlet ventilation hole 1
5 into the ventilation duct 16, and is discharged from the ventilation duct 16 via the outlet ventilation hole 17 and the exhaust duct 19. In this way, the cooling air can circulate well between the inside and outside of the outer damper 2, which improves cooling of the outer damper 2 and prevents heating due to wind damage.

As described above, the present invention allows the cooling air to pass between the inside and outside of the outer damper, so that the cooling air can pass inside and outside the outer damper, and the outer damper is well cooled. It is possible to obtain a cooling device for a superconducting rotating electrical machine that provides good cooling.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view of the essential parts of a superconducting generator in an embodiment of the cooling device for a superconducting rotating electric machine of the present invention, and FIG. The cross-sectional view, FIG. 3, is also a cross-sectional view of the outlet ventilation hole. 1... Damper support, 2... Outer damper, 3
... Stator winding, 6... Stator core, 12... Stator frame, 14... Ventilation partition plate, 15... Inlet ventilation hole, 16... Ventilation duct, 17...・Exit ventilation hole, 1
8...Inlet filter, 19...Exhaust duct.

Claims (1)

[Scope of Claims] l゛;;-- An outer damper which is disposed opposite to the stator winding mounted on the inner peripheral side of the stator core with a predetermined gap therebetween, and which is supported by a damper support. In a cooling device for a superconducting rotating electrical machine, the cooling means is provided with a cooling means for cooling by cooling air flowing in and out through an inlet filter and an exhaust duct provided in the stator frame supporting the identifer core. a ventilation partition plate provided on the inner diameter side of the child winding and completely blocking the space between the inner diameter side of the bracket and the outer damper;
An inlet ventilation hole and an outlet ventilation hole are provided through a predetermined gap in the width direction and circumferential direction of the outer damper and the damper support, and the inlet ventilation hole and the outlet ventilation hole are surrounded by the inlet ventilation hole and the outlet ventilation hole,
and a ventilation duct provided on the inner diameter side of the outer damper, and the inlet ventilation hole allows the cooling air to easily enter, and the exit ventilation hole allows the cooling air to easily exit. Cooling device for rotating electrical machines. 2. The inlet ventilation hole is formed so as to face the rotating direction of the electric machine, and the outlet ventilation hole is formed so as to have a negative pressure with respect to the rotating direction of the electric machine. A cooling device for a superconducting rotating electrical machine according to claim 1.