Generator bearing seat upper cover with fuel cut-off protection function

Abstract

The utility model relates to the field of steam turbine generators, and discloses a bearing seat upper cover with an oil cut-off protection function, an oil tank is arranged on the bearing cover, and an oil tank oil inlet pipe, a bearing bush oil inlet pipe and a liquid level maintaining pipe are arranged in the oil tank to protect a generator bearing bush from being damaged when an oil supply system has an oil cut-off fault. When the generator operates normally, lubricating oil flows into the oil tank through the oil tank oil inlet pipe, and the lubricating oil in the oil tank flows into the bearing bush through an inlet in the upper portion of the bearing bush oil inlet pipe, so that rated oil quantity required by normal operation of the generator is provided for the bearing bush. Lubricating oil in the oil tank flows into the bearing bush through the oil drainage hole in the bearing bush oil inlet pipe, the generator bearing can operate for a period of time, and the generator bearing bush is protected against damage. The device is simple, reliable, practical and convenient.

Description

Technical Field

[0001] The utility model relates to the field of steam turbine generators, in particular to an upper cover of a generator bearing pedestal with an oil cut-off protection function. Background Art

[0002] The lubrication system of a steam turbine generator is an important system to ensure the safe operation of the generator. Once a failure occurs or improper human operation leads to abnormal oil supply, it will cause abnormal vibration and tripping of the generator set. In severe cases, it may even result in oil cut-off and bearing burning, damage to the journal, and may also cause permanent bending or cracking of the large shaft, leading to scrapping. Especially when it occurs during the implementation of overseas projects, the impact is even greater. It will not only cause significant economic losses to the project, but also have an adverse impact on the company overseas. Similar accidents have occurred in many power plants at home and abroad. Therefore, measures must be taken to prevent the expansion of accidents. Currently, power plants at home and abroad adopt an oil supply system with a main oil pump, an AC oil pump, and a DC oil pump to conduct oil cut-off protection at the oil supply source of the lubricating oil. The generator bearing pedestal adopts a direct oil supply method. When the oil supply pump fails, the generator bearing pedestal cannot effectively protect the bearing bush. In view of the above situation, there is an urgent need for a bearing pedestal structure that can meet the operation of the generator bearing for a period of time during an oil cut-off accident. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to disclose an upper cover of a generator bearing pedestal with an oil cut-off protection function. By installing an oil tank on the bearing cover, an oil tank inlet pipe, a bearing bush inlet pipe, and a liquid level maintenance pipe are arranged in the oil tank to protect the generator bearing bush from damage when an oil cut-off fault occurs in the oil supply system. When the generator is operating normally, the lubricating oil flows into the oil tank through the oil tank inlet pipe. The lubricating oil in the oil tank flows into the bearing bush through the upper inlet of the bearing bush inlet pipe, providing the rated oil volume required for the normal operation of the generator for the bearing bush. Once an oil cut-off accident occurs in the generator lubricating oil supply system, the lubricating oil in the oil tank flows into the bearing bush through the oil discharge holes on the bearing bush inlet pipe, which can meet the operation of the generator bearing for a period of time and protect the generator bearing bush from damage. The utility model is simple, reliable, practical, and convenient.

[0004] The utility model is composed of a bearing cover, an oil tank, an oil tank inlet pipe, a bearing bush inlet pipe, and a liquid level maintenance pipe. The bottom of the oil tank inlet pipe is connected to the lubricating oil inlet pipe, and the upper part is placed in the oil tank. The top height is higher than the bearing bush inlet pipe and lower than the liquid level maintenance pipe; the bottom of the bearing bush inlet pipe is connected to the bearing bush oil inlet, and the upper part is placed in the oil tank. The top height is lower than the oil tank inlet pipe, and a row of equally spaced oil discharge holes is arranged along the axial direction of the pipe; the bottom of the liquid level maintenance pipe is connected to the bearing pedestal oil return cavity, and the upper part is placed in the oil tank. The top height is higher than the oil tank inlet pipe and lower than the oil tank top cover.

[0005] Compared with the prior art, the beneficial effects of the present utility model are as follows: By installing an oil tank on the bearing cover, an oil tank inlet pipe, a bearing bush inlet pipe, and a liquid level maintaining pipe are arranged in the oil tank to protect the generator bearing bush from being damaged when a fuel cut-off fault occurs in the oil supply system. Since the bottom of the liquid level maintaining pipe is connected to the bearing housing oil return cavity, the upper part is placed in the oil tank, and the top height is higher than the oil tank inlet pipe and slightly lower than the top wall of the oil tank. When the lubricating oil level in the oil tank is too high, it can flow out from the bearing housing oil return cavity through the liquid level maintaining pipe, preventing the lubricating oil in the oil tank from overflowing due to being too full, and keeping a relatively high liquid level of the lubricating oil in the oil tank. Since the bottom of the oil tank inlet pipe is connected to the lubricating oil inlet pipe, the upper part is placed in the oil tank, and the top height is higher than the bearing bush inlet pipe and lower than the liquid level maintaining pipe. After the lubricating oil enters the oil tank from the oil tank inlet pipe, it can flow into the bearing bush from the upper inlet of the bearing bush inlet pipe. The lubricating oil flow rate is the flow rate required for the rated operation of the bearing bush. The fact that the oil tank inlet pipe is higher than the bearing bush inlet pipe can also prevent the lubricating oil from flowing back into the oil tank inlet pipe when a fuel cut-off accident occurs. Since the bottom of the bearing bush inlet pipe is connected to the bearing bush oil inlet, the upper part is placed in the oil tank, and the top height is lower than the oil tank inlet pipe. A row of equally spaced oil drain holes is arranged along the axial direction of the pipe. When a fuel cut-off accident occurs, the lubricating oil in the oil tank first flows into the bearing bush from the upper inlet of the bearing bush inlet pipe. When the lubricating oil level in the oil tank is below the top of the bearing bush inlet pipe, it flows into the bearing bush through the oil drain holes on the side wall of the bearing bush inlet pipe. As the lubricating oil level in the oil tank gradually drops, the number of oil drain holes on the bearing bush inlet pipe covered by the lubricating oil level becomes fewer, limiting the oil supply amount to the bearing bush and prolonging the oil supply time. The upper cover of the generator bearing housing with a fuel cut-off protection function can enable the bearing to operate for a period of time after a fuel cut-off, avoiding damage to the bearing bush and gaining time for emergency repair of the oil supply system. The present utility model is simple, reliable, practical, and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the present utility model;

[0007] Figure 2 It is a structural diagram of the bearing bush inlet pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0008] The technical solutions of the present application will be further described in detail below in conjunction with the specific embodiments. To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different structures.

[0009] Such as Figure 1As shown in the figure, the utility model consists of a bearing cover 1, an oil tank 2, an oil tank inlet pipe 3, a bearing bush inlet pipe 4, and a liquid level maintaining pipe 5. The bottom of the oil tank inlet pipe 3 is connected to the lubricating oil inlet pipe, and the upper part is placed in the oil tank 2. The top height is higher than that of the bearing bush inlet pipe 4 and lower than that of the liquid level maintaining pipe 5. The bottom of the bearing bush inlet pipe 4 is connected to the bearing bush oil inlet, and the upper part is placed in the oil tank 2. The top height is lower than that of the oil tank inlet pipe 3.

[0010] As Figure 2 shown, a row of equally spaced oil drain holes is arranged along the axial direction of the pipe. The bottom of the liquid level maintaining pipe 5 is connected to the bearing housing oil return cavity, and the upper part is placed in the oil tank 2. The top height is higher than that of the oil tank inlet pipe 3 and lower than the top cover of the oil tank 2.

[0011] Since the bottom of the liquid level maintaining pipe is connected to the bearing housing oil return cavity, and the upper part is placed in the oil tank, with the top height higher than the oil tank inlet pipe and slightly lower than the top wall of the oil tank, when the lubricating oil level in the oil tank is too high, it can flow out from the bearing housing oil return cavity through the liquid level maintaining pipe, preventing the lubricating oil in the oil tank from overflowing and keeping a relatively high liquid level of the lubricating oil in the oil tank. Since the bottom of the oil tank inlet pipe is connected to the lubricating oil inlet pipe, and the upper part is placed in the oil tank, with the top height higher than the bearing bush inlet pipe and lower than the liquid level maintaining pipe, after the lubricating oil enters the oil tank from the oil tank inlet pipe, it can flow into the bearing bush from the upper inlet of the bearing bush inlet pipe. The lubricating oil flow rate is the required flow rate for the rated operation of the bearing bush. The fact that the oil tank inlet pipe is higher than the bearing bush inlet pipe can also prevent the lubricating oil from flowing back into the oil tank inlet pipe in case of an oil cut-off accident. Since the bottom of the bearing bush inlet pipe is connected to the bearing bush oil inlet, and the upper part is placed in the oil tank, with the top height lower than the oil tank inlet pipe 3, about 1 / 2 to 2 / 3 of the oil tank height, a row of equally spaced small holes is arranged on the side wall of the pipe. The diameter of the small holes should be calculated according to the minimum oil quantity required for the operation of the generator bearing bush. When an oil cut-off accident occurs, the lubricating oil in the oil tank first flows into the bearing bush from the upper inlet of the bearing bush inlet pipe. When the lubricating oil level in the oil tank is below the top of the bearing bush inlet pipe, it flows into the bearing bush through the small oil drain holes on the bearing bush inlet pipe. As the lubricating oil level in the oil tank gradually drops, the fewer the oil drain holes on the bearing bush inlet pipe covered by the lubricating oil level, which limits the oil supply to the bearing bush and prolongs the oil supply time. The upper cover of the generator bearing housing with an oil cut-off protection function can enable the bearing to operate for a period of time after an oil cut-off, avoiding damage to the bearing bush and gaining time for repairing the oil supply system. The utility model is simple, reliable, practical, and convenient.

[0012] Finally, the protection scope of the utility model is not limited to the above embodiments. Obviously, those skilled in the art can make various changes and deformations to the utility model without departing from the scope and spirit of the utility model. If these changes and deformations fall within the scope of the claims of the utility model and its equivalent technologies, the utility model also intends to include these changes and deformations.

Claims

1. An upper cover of a generator bearing housing with an oil cut-off protection function, characterized in that: It is composed of a bearing cover (1), an oil tank (2), an oil tank inlet pipe (3), a bearing bush inlet pipe (4), and a liquid level maintaining pipe (5). The bottom of the oil tank inlet pipe (3) is connected to a lubricating oil inlet pipe, and the upper part is placed in the oil tank (2), and the top height is higher than that of the bearing bush inlet pipe (4) and lower than that of the liquid level maintaining pipe (5); the bottom of the bearing bush inlet pipe (4) is connected to a bearing bush oil inlet, and the upper part is placed in the oil tank (2), and the top height is lower than that of the oil tank inlet pipe (3), and a row of equally spaced oil drain holes are arranged along the axial direction of the pipe; the bottom of the liquid level maintaining pipe (5) is connected to a bearing seat oil return cavity, and the upper part is placed in the oil tank (2), and the top height is higher than that of the oil tank inlet pipe (3) and lower than the top cover of the oil tank (2).

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