JPS6217940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-voltage bushing mounting device for a rotating electrical machine, and more particularly to a high-voltage bushing mounting device for a rotating electrical machine that has a good sealing effect.

A high-pressure bushing is provided on the upper part of a stator of a rotating electric machine, such as a hydrogen-cooled turbine generator, and this high-pressure bushing is attached via a sealing means to prevent hydrogen gas from leaking inside. A conventional example of the mounting device is shown in FIGS. 1 and 2. As shown in the figure, a high-pressure bushing 2 is provided on the upper part of the stator 1, passing through the stator, and a sealing means 3 is provided between the surface of the high-pressure bushing and the mounting surface 1a of the high-pressure bushing. It is provided. As a sealing means, a rubber packing 3b is provided with compressed pressure interposed, and the hydrogen gas inside the stator 1 is sealed by the contact surface 3c between the rubber packing 3b and the high pressure bushing 2, and the contact surface 3c between the rubber packing 3b and the upper part of the stator 1. It is designed to maintain the Even with this configuration, the sealing effect is sufficient for a short period of time, but due to the high temperature atmosphere during operation, heat cycles, etc., the rubber sealing may occur over many years.
b has deteriorated over time, and there was concern about maintaining a hydrogen gas seal over a long period of time using only the rubber packing 3b. In addition, in the same figure, 10 is a lead line, 1
1 is a terminal cover.

The present invention has been made in view of the above points,
The object is to provide a high-voltage bushing attachment device for a rotating electrical machine that can maintain a good seal over a long period of time.

That is, the present invention forms the rubber packing into a double rubber packing of an inner rubber packing and an outer rubber packing, and also communicates the gap formed between the inner packing and the outer packing in the frame of the stator with the outside of the stator. A sealing compound injection hole is provided, and the sealing compound is injected from outside the stator into the gap between the inner packing and the outer packing through the sealing compound injection hole to achieve the intended purpose. be.

The present invention will be explained below based on the illustrated embodiments. FIG. 3 shows an embodiment of the invention. Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the sealing means 3
a shows two packings on the high-pressure bushing mounting surface 1a that are concentric with the high-pressure bushing and have different diameters, that is, an inner rubber packing 4 and an outer rubber packing 5, and both rubber packings 4,
The sealing compound 7 is filled into the gap 6 between the stator 1 and the stator 1. In particular, the sealing compound 7 is formed to be supplied from the outside of the stator 1. In other words, there is a gap 6 in the frame of the stator 1.
A sealing compound injection hole 8 communicating with the outside is provided, and the sealing compound 7 is injected from this injection hole.
is being injected. With this configuration, the contact surfaces 4a and 5a between the rubber packings 4 and 5, the high pressure bushing 2, and the upper part of the stator 1 are sealed to prevent hydrogen gas from leaking, and the gap 6 between the rubber packings 4 and 5 is filled with hydrogen. Since it is filled with a sealing compound 7 that has excellent gas sealing properties, hydrogen gas is sealed not only by the rubber packings 4 and 5 but also by the sealing compound 7, and even if both the rubber packings 4 and 5 deteriorate, the seal will remain intact. Compound 7 prevents hydrogen gas from leaking. In particular, seal compound 7
The gap 6 between both rubber packings 4 and 5 is removed from the outside of the stator 1 at a pressure slightly higher than the hydrogen gas inside the stator 1.
Since it is filled with water, the sealing effect can be maintained for a long period of time. In addition, in the figure, 9 is a check valve.

As described above, the present invention uses the rubber packing and the sealing compound to seal hydrogen gas, so even if the rubber packing deteriorates, the sealing compound maintains its sealing effect, and the seal can be maintained for a long period of time. It is possible to obtain a high-voltage bushing mounting device for a rotating electrical machine that maintains its effectiveness and maintains a good seal over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of a rotating electrical machine near the mounting device of a conventional high-voltage bushing mounting device for a rotating electrical machine, Fig. 2 is a detailed view of the A frame portion in Fig. 1, and Fig.
The figure is a longitudinal sectional side view of an embodiment of the high-voltage bushing attachment device for a rotating electric machine according to the present invention. DESCRIPTION OF SYMBOLS 1... Stator, 1a... High pressure bushing mounting surface, 2... High pressure bushing, 3a... Sealing means, 4... Inner rubber packing, 5... Outer rubber packing, 6... Gap, 7... Seal compound.

Claims (1)

[Claims] 1. A high-pressure bushing is arranged to penetrate through the stator frame, and a rubber packing concentric with the high-pressure bushing is compressed and interposed between the high-pressure bushing and the penetrating portion to seal the inside and outside of the stator. In the high-voltage bushing installation device for a rotating electric machine, the rubber packing is formed into a double rubber packing of an inner rubber packing and an outer packing, and a gap is formed between the inner packing and the outer packing in the frame of the stator. and the outside of the stator are provided, and a seal compound is injected from the outside of the stator into the gap between the inner packing and the outer packing through the seal compound injection hole. Installation equipment for high voltage bushings in electrical machinery.