A hydrogen side seal oil automatic drainage device for a combustion engine generator

Abstract

The utility model discloses a kind of hydrogen side sealing oil automatic oil drain device of gas turbine generator, it is related to generator technical field.When the liquid level of hydrogen side oil return tank is too low, hydrogen leaks into main lubricating oil system, causes combustion or explosion.The utility model includes oil drain control valve, float ball oil tank, stop valve, pipeline, the float ball oil tank is connected hydrogen side oil return tank by first oil return pipe, second stop valve is provided on the first oil return pipe, float ball oil tank is connected generator by exhaust pipe, third stop valve is provided on the exhaust pipe, float ball oil tank is connected bearing oil return expansion tank by pipeline, the outlet end of oil drain control valve is connected on pipeline.The utility model in the process of generator starting, running, shutdown hydrogen removal, liquid level control valve in automatic oil drain device can guarantee the liquid level of hydrogen side oil return tank, help hydrogen better precipitate from oil, prevent hydrogen from leaking into main lubricating oil system, so that unit can be safely, stably operated.

Description

Technical Field

[0001] This utility model relates to the field of generator technology, and in particular to an automatic oil draining device for the hydrogen side sealing oil of a gas turbine generator. Background Technology

[0002] The stator, rotor, and stator core of a gas turbine generator are cooled by hydrogen. The main drawbacks of using hydrogen cooling stem from the physicochemical properties of hydrogen and the complexity of the system. Hydrogen molecules have small diameters and high permeability, making them prone to leakage through gaps in the generator casing. Hydrogen mixed with air forms an explosive gas with a wide explosion limit range (approximately 4% to 75% by volume concentration). If a leak occurs and comes into contact with an open flame or electric arc, it may ignite or explode, threatening the safe operation of the generator.

[0003] The oil level in the hydrogen-side sealed oil tank needs to be precisely controlled by devices such as float valves. However, if the oil replenishment float valve is in a loose state for a long time or has an internal leakage fault, it will cause the system to continuously replenish oil, resulting in a rapid rise in the oil level, or even overflowing into the defoaming tank, posing a risk of oil entering the generator. At the same time, when the oil level is low, the magnetic float in the level signal measuring cylinder may cause false signals or failure of the protection circuit due to the magnetization of the reed switch itself or carbon buildup and erosion of the contacts, making it impossible to regulate the oil level normally.

[0004] Utility Model Content

[0005] The purpose of this invention is to overcome the problem that when the liquid level in the hydrogen-side return oil tank is too low, hydrogen leaks into the main lubricating oil system, causing combustion or explosion, and to provide an automatic oil draining device for the hydrogen-side sealing oil of a gas turbine generator.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] An automatic oil draining device for the hydrogen-side sealing oil of a gas turbine generator includes a draining control valve, a float tank, a shut-off valve, and pipelines. The float tank is connected to a hydrogen-side return oil tank via a first return oil pipe, on which a second shut-off valve is installed. The float tank is connected to the generator via an exhaust pipe, on which a third shut-off valve is installed. The float tank is connected to a bearing return oil expansion tank via pipelines, on which a shut-off valve is installed. The outlet end of the draining control valve is connected to the pipelines, with the connection point located between the shut-off valve and the bearing return oil expansion tank. The inlet end of the draining control valve is connected to the hydrogen-side return oil tank via a second return oil pipe. A level transmitter is installed inside the hydrogen-side return oil tank, and the level transmitter is connected to the draining control valve via a control line.

[0008] Furthermore, the oil discharge control valve includes a valve seat, valve core, valve body, valve cover, stud, nut, valve stem, and lock nut. The valve seat is welded to the valve body, the valve body and valve cover are threadedly connected by stud and nut, the valve core and valve stem are threadedly connected, and the valve stem and lock nut are threadedly connected.

[0009] Furthermore, the oil drain control valve is connected in parallel with the float oil tank to the bearing return oil expansion tank.

[0010] The beneficial effects of this utility model are:

[0011] During the generator startup, operation, shutdown, and hydrogen discharge processes, the opening of the liquid level control valve in the automatic oil discharge device is automatically controlled by the liquid level transmitter in the hydrogen-side return oil tank. The liquid level control valve can ensure the liquid level in the hydrogen-side return oil tank, help hydrogen gas to be better extracted from the oil, prevent hydrogen gas from leaking into the main lubricating oil system, and enable the unit to operate safely and stably. Attached Figure Description

[0012] Figure 1 This is a control block diagram of the present invention;

[0013] Figure 2 This is a schematic diagram of the oil drain control valve.

[0014] In the diagram: 1-Oil drain control valve; 2-Float oil tank; 3-Stop valve; 4-Pipeline; 5-Generator; 6-Valve seat; 7-Valve core; 8-Valve body; 9-Valve cover; 10-Stud; 11-Nut; 12-Valve stem; 13-Locking nut; 14-Hydrogen side return oil tank; 15-Bearing return oil expansion tank. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0016] Example:

[0017] like Figure 1-2 As shown, this utility model provides an automatic oil draining device for the hydrogen side sealing oil of a gas turbine generator, including an oil draining control valve 1, a float oil tank 2, a shut-off valve 3, and a pipeline 4. The float oil tank 2 is connected to the hydrogen side return oil tank 14 through a first return oil pipe, and a second shut-off valve is installed on the first return oil pipe. The float oil tank 2 is connected to the generator 5 through an exhaust pipe, and a third shut-off valve is installed on the exhaust pipe. The float oil tank 2 is connected to the bearing return oil expansion tank 15 through the pipeline 4, and a shut-off valve 3 is installed on the pipeline 4. The outlet end of the oil draining control valve 1 is connected to the pipeline 4, and the connection point is located between the shut-off valve 3 and the bearing return oil expansion tank 15. The inlet end of the oil draining control valve 1 is connected to the hydrogen side return oil tank 14 through a second return oil pipe. A level transmitter is installed in the hydrogen side return oil tank 14, and the level transmitter is connected to the oil draining control valve 1 through a control line.

[0018] Specifically, the oil discharge control valve 1 includes a valve seat 6, a valve core 7, a valve body 8, a valve cover 9, a stud 10, a nut 11, a valve stem 12, and a locking nut 13. The valve seat 6 is welded to the valve body 8, the valve body 8 is threadedly connected to the valve cover 9 through the stud 10 and the nut 11, the valve core 7 is threadedly connected to the valve stem 12, and the valve stem 12 is threadedly connected to the locking nut 13.

[0019] Specifically, the oil drain control valve 1 and the float oil tank 2 are connected in parallel to the bearing return oil expansion tank 15.

[0020] In this embodiment, the hydrogen-side oil in the hydrogen-side return oil tank 14 is discharged to the bearing return oil expansion tank 15 through the oil discharge control valve 1 and the float oil tank 2. Hydrogen gas in the float oil tank 2 returns to the generator 5 through the exhaust pipe. The opening of the oil discharge control valve 1 in the automatic oil discharge device is automatically controlled by the level transmitter in the hydrogen-side return oil tank 14. The oil discharge control valve 1 ensures the liquid level in the hydrogen-side return oil tank 14, helping hydrogen gas to better separate from the oil. The float valve closes when the oil level in the float oil tank 2 is low to prevent hydrogen gas from leaking into the main lubricating oil system.

[0021] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. An automatic oil draining device for the hydrogen side sealing oil of a gas turbine generator, characterized in that: The system includes an oil drain control valve (1), a float oil tank (2), a shut-off valve (3), and a pipeline (4). The float oil tank (2) is connected to the hydrogen-side return oil tank (14) via a first return oil pipe. A second shut-off valve is installed on the first return oil pipe. The float oil tank (2) is connected to the generator (5) via an exhaust pipe. A third shut-off valve is installed on the exhaust pipe. The float oil tank (2) is connected to the bearing return oil expansion tank (15) via the pipeline (4). A shut-off valve (3) is installed on the pipeline (4). The outlet end of the oil drain control valve (1) is connected to the pipeline (4). The connection point is located between the shut-off valve (3) and the bearing return oil expansion tank (15). The inlet end of the oil drain control valve (1) is connected to the hydrogen-side return oil tank (14) via a second return oil pipe. A level transmitter is installed inside the hydrogen-side return oil tank (14). The level transmitter is connected to the oil drain control valve (1) via a control line.

2. The automatic oil draining device for hydrogen-side sealing oil of a gas turbine generator according to claim 1, characterized in that: The oil discharge control valve (1) includes a valve seat (6), a valve core (7), a valve body (8), a valve cover (9), a stud (10), a nut (11), a valve stem (12), and a locking nut (13). The valve seat (6) is welded to the valve body (8). The valve body (8) and the valve cover (9) are threaded together by the stud (10) and the nut (11). The valve core (7) is threaded together with the valve stem (12). The valve stem (12) is threaded together with the locking nut (13).

3. The automatic oil draining device for hydrogen-side sealing oil of a gas turbine generator according to claim 1, characterized in that: The oil drain control valve (1) is connected in parallel with the float oil tank (2) to the bearing return oil expansion tank (15).

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