JPS6125331Y2 - - Google Patents

Description

[Detailed description of the invention] This invention prevents oil mist generated in the oil tank from leaking out of the oil tank in which bearings that support the rotating parts of rotating electric machines, such as vertical water turbine generators, are housed. Regarding the structure to prevent.

FIG. 1 shows the structure of a bearing oil tank for a conventional rotating electric machine, such as a vertical water turbine generator.

In the figure, 1 is a thrust receiver fitted to the shaft, 2
3 is a bearing oil tank in which these 1 and 2 are built, and 4 is an outer periphery with an inner ring 4a that maintains a small gap with the thrust holder 1. is an oil tank cover attached to the oil tank, 5 is a windshield plate attached to the upper part of the inner ring 4a of this oil tank cover 4, 6 is lubricating oil stored in the bearing oil tank 3, and 7
8 is a cooling fan attached to the rotor located above the bearing oil tank, and 8 is an air supply pipe that supplies pressurized air to the labyrinth portion of the inner ring 4a. In a conventional rotating electric machine having a rotating part configured as described above, a thrust holder 1 is fixed to a shaft in a bearing oil tank 3.
When the bearing rotates at high speed, the oil 6 collides with the steady bearing 2, which is placed around its outer periphery with a bearing gap of about 0.2 to 0.5 mm, and is immersed in the bearing to approximately half its height, producing a large amount of oil mist. Occur. For this reason, the oil tank cover 4 attached to the upper part of the bearing oil tank 3 is securely fastened to the oil tank 3 on the outer periphery, but an inner ring 4a is provided on the inner periphery to keep the gap with the rotating parts as small as possible. Trying to prevent fog from escaping. This inner circle 4
A felt-like windshield plate 5 is installed on top of a, and several tens of mm of water column of pressurized air is supplied to the labyrinth part of the inner ring 4a to form an air seal and prevent the oil mist from leaking out of the bearing oil tank 3. are doing. The conventional oil tank cover 4 has the above structure, and since the gap between the inner periphery of the inner ring 4a and the thrust receiver 1 is required to be a bearing gap +α, some gap is unavoidable. Further, the windshield plate 5 attached to the upper part of the inner ring 4a is made of felt material for contact with the thrust receiver 1, and if it contains oil 6, the gap becomes large. Furthermore, since the cooling fan 7 is located above the oil tank cover 4, there is a drawback that leakage of oil mist is further promoted.

This idea was made to eliminate the drawbacks of the conventional ones as mentioned above, and by attaching a fan to the outer periphery of the rotating body to push the generated oil mist back to the surface of the oil, An object of the present invention is to provide a rotating electrical machine that can easily prevent oil mist from leaking out of an oil tank.

An embodiment of this invention will be described below with reference to the drawings. In Fig. 2, a thrust bearing 1, a steady bearing 2,
The bearing oil tank 3, the oil tank cover 4, the inner ring 4a, the windshield plate 5, and the oil 6 are the same as the conventional ones shown in FIG. 1, so their explanations will be omitted. Reference numeral 9 denotes a fan guide protruding from the lower surface of the oil tank cover 4, and reference numeral 10 denotes a fan attached to the outer periphery of the thrust receiver with a predetermined gap between the fan guide 9 and the fan guide 9. In the embodiment of this invention configured in this way, oil droplets scattered during rotation within the bearing oil tank 3 are suppressed by the oil tank cover 4,
Also, a large amount of oil mist is generated due to the fan action of the fan 10 attached to the thrust holder 1, just before the gap between the thrust holder 1 and the inner ring 4a, which is the only place where it leaks.
On the contrary, it will be pushed back, and oil mist will be prevented from leaking. In the above embodiment, the fan 10 is provided on the thrust holder 1 in the bearing oil tank 3, but the fan 10 is of course not limited to this position, and in short, the fan 10 is provided at a position where the generated oil mist can be pushed back to the surface of the oil. Needless to say, it's a good thing.

As described above, according to this invention, the fan is attached to the outer periphery of the part of the rotating body that is located inside the bearing oil tank, so that the generated oil mist is pushed back to the surface of the oil, thereby preventing the oil mist from leaking out of the oil tank. This can be easily prevented, and as a result, there is no need for an air supply pipe or the like in the conventional device, which has the effect of providing a rotating electric machine with a simple structure and low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a bearing oil tank portion of a conventional rotating electrical machine, and FIG. 2 is a sectional view showing the structure of a bearing oil tank portion according to an embodiment of the invention. In the figure, 1 is a thrust receiver as a rotating body, 2
is a steady bearing, 3 is a bearing oil tank, 9 is a fan guide,
10 is a fan.

Claims (1)

[Claims for Utility Model Registration] (1) A device comprising a rotating body supported by a bearing in oil stored in an oil tank, in which a fan is installed on the outer periphery of the portion of the rotating body located in the oil tank. A rotating electric machine, characterized in that the rotating electric machine is attached to the rotating body and is configured to push back oil mist generated when the oil collides with the bearing as the rotating body rotates to the surface side of the oil. (2) The rotating electric machine according to claim 1, wherein the rotating body is a rotor shaft of a vertical water turbine generator.