JPS6117227B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid supply/drainage device for a liquid-cooled rotor of a rotating electric machine.

A conventional liquid-cooled rotor for a rotating electrical machine has an axial liquid supply passage through which coolant is supplied from the outside to the rotating shaft, and a drainage passage outside which coolant is discharged after cooling the rotor. The cooling liquid in the concentric drainage passages is collected in a stationary liquid collecting ring provided on the outside of the rotating shaft through drainage holes that open in the radial direction of the rotating shaft, and is discharged from this liquid collecting ring through piping. There are things that make you do it.

In such a liquid supply/drainage structure, if the circulation pump stops for some reason, part of the coolant filled in the rotor will flow out into the liquid collection ring through the liquid drainage hole, resulting in the pump After the rotor stops, the rotor continues to rotate with gas and coolant coexisting in the cooling passage within the rotor until the rotor completely stops. If the rotor rotates in such a state, it will be difficult for the rotor to continue rotating stably due to the difference in centrifugal force exerted by the liquid and gas.

Furthermore, when the circulation pump is stopped, it must be confirmed that all the coolant passages in the rotor are filled with liquid each time the pump is started next time.

The present invention solves the above-mentioned problems, and is a liquid cooling system for rotating electric machines that can maintain stable rotation in a state where the coolant inside the rotor is filled without flowing out even if the coolant circulation pump stops. The present invention provides a rotor fluid supply/drainage device.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

A rotating shaft 1 that is a part of a liquid-cooled rotor of a rotating electric machine
1 is provided with a double-configured center hole in the axial direction, the inner center hole forms a liquid supply passage 12 that is used as an outgoing path for feeding the cooling liquid by a circulation pump (not shown), and the outer center hole is A drain passage 13 is formed which communicates with the liquid supply passage 12 and serves as a return path for discharging the coolant that has cooled the rotor and heated up. On the shaft end side of the liquid drain passage 13, there is a cylinder 1 whose hole has an outer diameter larger than that of the liquid drainage passage 13.
form 4. The most axial end of the cylinder 14 has the same hole diameter as the drain passage 13, and the end surface is sealed with a wall 14a. This cylinder 14 is provided with a plurality of drainage holes 15 that open radially on the outer peripheral surface of the rotating shaft 11. A stationary liquid collecting ring 16 surrounding this liquid drain hole 5 and communicating with the cylinder 14 is provided on the outside of the rotating shaft 11, and a liquid drain pipe 17 below this liquid collecting ring 16 leads the cooling liquid to the outside. will be established. A valve body 18 is provided within the cylinder 14 so as to be slidable in the axial direction. As shown in FIG. 3, the valve body 18 has a bottomed cylindrical shape with an L-shaped cross section, and its internal cavity communicates with the drain passage 13. Furthermore, the cylindrical portion has a plurality of valve holes 19 spaced apart in the circumferential direction on the outer diameter side thereof, and the positions of the valve holes 19 correspond to the drain holes 15. Therefore, when the valve body 18 moves in the axial direction and the positions of the valve hole 19 and the liquid drain hole 15 match, the liquid drain passage 13 and the liquid collecting ring 16 communicate with each other, and if they do not match, they are blocked. There is. A hydraulic chamber 20 is located between the outside of the bottom of the valve body in the cylinder 14 and the wall 14a.
This hydraulic pressure chamber 20 and the liquid supply passage 12 are communicated through a through hole 21. and compression spring 22
is interposed between the end of the cylinder 14 and the open end of the cylindrical portion of the valve body 18 to press the valve body 18 in the closing direction. This compression spring 22 is applied to the valve body 18 when the hydraulic pressure in the liquid supply passage 12 has a normal oil supply pressure, that is, when the hydraulic pressure in the hydraulic pressure chamber 20 has a normal oil supply pressure. Pressed and compressed, drain hole 15 and valve hole 1
Set the strength so that it communicates with 9.

Next, the operation of the above embodiment will be explained. During operation, coolant is pressurized into the liquid supply passage 12 by operation of a coolant circulation pump (not shown). Also, the valve body 18
moves to the left in the figure against the spring pressure of the spring 22 due to the pressure of the coolant in the hydraulic chamber 20, and drains into the drain hole 15 of the cylinder.
to open. The coolant injected into the liquid supply passage 12 cools a rotor portion (not shown), is guided to the liquid drainage passage 13, and is discharged from the open liquid drainage hole 15 to the liquid collecting ring 16. The cooling liquid in the liquid collection ring 16 is led to a cooler 12 (not shown) through a liquid drain pipe 17, cooled, and then forced into the liquid supply passage 12 again by the circulation pump.

If the circulation pump stops for some reason during operation, the injection of coolant into the liquid supply passage 12 stops, and at the same time, the pressure in the hydraulic pressure chamber 20 decreases, and the valve body 18 is pressed against the spring 2.
2 moves to the right in the figure and closes the drain hole 15. This prevents the coolant from being discharged from the drain passage 13 and keeps the rotor filled with the coolant, so that no unbalanced force is generated due to rotation.

As described above, the present invention includes a valve body that opens and closes the rotor drain passage, and closes the valve body in response to a drop in fluid pressure in the liquid supply passage due to the stoppage of the coolant circulation pump. As a result, even if the circulation pump stops, stable rotation can be maintained in a filled state without the coolant flowing out from the rotor. It also has the effect of being able to start operation immediately upon restart.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing a coolant circulation state and a coolant circulation stop state of a liquid supply/drainage device for a liquid-cooled rotor of a rotating electric machine according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of the same device. FIG. 3 is a detailed view of the valve body of FIG. DESCRIPTION OF SYMBOLS 11...Rotating shaft, 12...Liquid supply passage, 13...Drainage passage, 15...Drainage hole, 16...Liquid collection ring, 18...Valve body,
20... Hydraulic pressure chamber, 21... Through hole, 22... Spring.

Claims (1)

[Claims] 1 A liquid supply passage that extends in the axial direction in a double direction within the rotating shaft of the liquid-cooled rotor, with an inner side for guiding the coolant pumped from the outside to the rotor, and an outer side for guiding the liquid drained from the rotor. a cooling liquid passage serving as a passage; a liquid drainage hole provided in the rotating shaft that communicates the liquid drainage passage with a liquid collection ring disposed on the outer circumferential side of the rotating shaft; and a liquid drainage hole that is slidable in the axial direction within the liquid drainage passage. The valve body is provided with a hydraulic pressure chamber that communicates with the liquid supply passage in the axial direction between the rotary shaft and the valve body that is pressed toward the hydraulic pressure chamber side by the elasticity of a spring. A liquid-cooled rotor for a rotating electric machine, characterized in that a liquid drain passage is opened to a liquid drain hole when a predetermined liquid pressure is present in the chamber, and is configured to slide and close when the liquid pressure decreases. liquid supply and drainage equipment.