Single-flow ring type sealing oil equipment of steam turbine

Abstract

The utility model relates to the technical field of sealing oil equipment, and discloses steam turbine uniflow ring type sealing oil equipment which comprises a hydrogen side oil return tank, a floating ball valve body is installed at an oil return pipe opening of the hydrogen side oil return tank through a flange, a connecting piece is installed at the top of the floating ball valve body, a floating ball piece is inserted in the connecting piece, and a sealing ring is installed on the floating ball piece. Liquid level sensors are mounted at the lower parts of the left side and the right side of the inner wall of the hydrogen side oil return tank; the filter shell is installed at a pipe opening of the floating ball valve body through a flange, connecting pipes are installed on the left side and the right side of the filter shell correspondingly, and an electromagnetic valve is installed on the outer side of the connecting pipe on the left side through a flange; and the differential pressure sensor is arranged on the top core of the connecting pipe. According to the single-flow ring type sealing oil equipment of the steam turbine, the electromagnetic valve is additionally arranged behind the floating ball valve body, so that when the floating ball piece is clamped at a high position, the oil level of the hydrogen side oil tank rapidly drops, the liquid level sensor is triggered to be interlocked and close the floating ball valve and the electromagnetic valve, hydrogen leakage is prevented, and the use safety of the sealing oil equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing oil equipment technology, specifically a single-flow ring type sealing oil equipment for steam turbines. Background Technology

[0002] The turbine sealing oil system is a core safety component of a hydrogen-cooled generator, primarily used to prevent hydrogen leakage within the generator and to prevent the intrusion of external air and moisture, ensuring the safe operation of the generator set. In the power industry, hydrogen-cooled generators are widely used in large thermal power generating units (such as 300MW and above) due to their advantages of high cooling efficiency and low losses. As a key supporting device for hydrogen-cooled generators, the performance of the sealing oil system directly affects the unit's safety, economy, and environmental performance.

[0003] In common single-flow ring sealing oil systems, float valves are typically used to control the oil level in the hydrogen-side return tank. The float valve automatically adjusts the opening and closing of the return oil channel based on the oil level to maintain normal system operation. However, in practical applications, float valves can become stuck, especially when they become stuck at a high position and cannot fall back down. Once the float valve is stuck at a high position, the oil level in the hydrogen-side tank will drop rapidly, causing hydrogen leakage from the generator and posing a safety hazard. Furthermore, existing sealing oil equipment lacks an effective filtration and monitoring mechanism for impurities in the oil return channel. Impurities can easily enter critical components such as solenoid valves, causing component jamming and affecting the normal operation of the equipment, thus failing to meet the working requirements of sealing oil equipment. Therefore, a single-flow ring sealing oil device for steam turbines is proposed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a single-flow ring type sealing oil device for steam turbines, which solves the technical problem that when the float valve is stuck at a high position, the oil level in the hydrogen-side oil tank drops rapidly, causing hydrogen leakage from the generator and posing a safety hazard.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a single-flow ring type sealing oil device for steam turbines, comprising:

[0006] The hydrogen-side return oil tank has a float valve body installed at the return oil port of the hydrogen-side return oil tank via a flange. A connector is installed on the top of the float valve body, and a float is inserted inside the connector. Liquid level sensors are installed on the lower left and right sides of the inner wall of the hydrogen-side return oil tank.

[0007] The filter housing is installed at the port of the float valve body via a flange. Connecting pipes are installed on both the left and right sides of the filter housing. A solenoid valve is installed on the outside of the connecting pipe on the left side via a flange.

[0008] A differential pressure sensor is installed at the top of the connecting pipe. A cylindrical frame is inserted inside the filter housing. An assembly block is connected to the front side of the cylindrical frame. A filter element is inserted inside the cylindrical frame.

[0009] Preferably, the float is inserted inside the hydrogen-side return oil tank, and sealing rings are snapped into the connecting flanges of the float valve body, filter housing, and solenoid valve of the hydrogen-side return oil tank. The added sealing rings improve the sealing performance of the installation.

[0010] Preferably, the contact surfaces of the assembly plug and the cylindrical frame are both semi-circular, and sealing gaskets are snapped onto both outer sides of the assembly plug. The added sealing gaskets improve the sealing performance of the assembly plug.

[0011] Preferably, the front left and right sides of the assembly block are provided with limit holes, the number of the limit holes is 2-4 sets, and each limit hole is provided with a pin.

[0012] Preferably, the front end of each pin is connected to a limiting plate, and the top left and right sides of the filter housing are connected to screw seats. Each limiting plate has a screw inserted into its upper inner side, and the screw is screwed into the inside of the screw seat. By inserting the pin into the limiting hole and then screwing the bolt into the screw seat, the installation of the limiting plate can be completed, which can limit the position of the assembly block and facilitate the replacement of the filter element.

[0013] Compared with the prior art, this utility model provides a single-flow ring type sealing oil device for steam turbines, which has the following beneficial effects:

[0014] 1. The single-flow ring sealing oil equipment for steam turbines, by adding a solenoid valve after the float valve body, enables the oil level in the hydrogen side tank to drop rapidly when the float is stuck in a high position, triggering the liquid level sensor to interlock and close the float valve and solenoid valve, preventing hydrogen leakage and improving the safety of the sealing oil equipment.

[0015] 2. This turbine single-flow ring sealing oil device, through the addition of a filter housing, allows the mounting block, cylindrical frame, and filter element to be installed inside, enabling liquid filtration and preventing impurities from entering the solenoid valve and causing jamming. This improves the smoothness of equipment operation. Furthermore, the added differential pressure sensor can detect the pressure difference before and after the filter housing in real time. When the pressure difference exceeds the preset value, an alarm is triggered to prompt the replacement of the filter element, avoiding pipeline blockage caused by filter element clogging. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is an exploded view of the filter housing and assembly block structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the differential pressure sensor structure of this utility model.

[0019] In the diagram: 1. Hydrogen-side return oil tank; 2. Float valve body; 3. Connector; 4. Float component; 5. Filter housing; 6. Solenoid valve; 7. Connecting pipe; 8. Differential pressure sensor; 9. Cylindrical frame; 10. Assembly block; 11. Filter element; 12. Screw connector; 13. Limiting hole; 14. Pin; 15. Limiting plate; 16. Screw; 17. Sealing gasket; 18. Liquid level sensor. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] This utility model provides a technical solution: a single-flow ring type sealing oil device for a steam turbine, comprising a hydrogen-side return oil tank 1, a float valve body 2, a connector 3, a float component 4, a filter housing 5, a solenoid valve 6, a connecting pipe 7, a differential pressure sensor 8, a cylindrical frame 9, an assembly block 10, a filter element 11, a screw seat 12, a limiting hole 13, a pin 14, a limiting plate 15, a screw 16, a sealing gasket 17, and a liquid level sensor 18.

[0022] Please see Figure 1 A float valve body 2 is installed at the return oil port of the hydrogen-side return oil tank 1 via a flange. A connector 3 is installed on the top of the float valve body 2. A float 4 is inserted inside the connector 3. Liquid level sensors 18 are installed on the lower left and right sides of the inner wall of the hydrogen-side return oil tank 1.

[0023] The filter housing 5 is mounted via a flange at the inlet of the float valve body 2. Please refer to [link / reference]. Figure 3 Connecting pipes 7 are installed on both the left and right sides of the filter housing 5. Please refer to [link / reference]. Figure 1 A solenoid valve 6 is installed on the outside of the left connecting pipe 7 via a flange;

[0024] Please see Figure 3 Differential pressure sensor 8 is installed on the top of connecting pipe 7. Please refer to [link / reference]. Figure 2A cylindrical frame 9 is inserted inside the filter housing 5. An assembly block 10 is connected to the front side of the cylindrical frame 9. A filter element 11 is inserted inside the cylindrical frame 9. A float ball 4 is inserted inside the hydrogen-side return oil tank 1. Sealing rings are snapped into the connecting flanges of the float valve body 2, filter housing 5, and solenoid valve 6 in the hydrogen-side return oil tank 1. By adding a solenoid valve 6 after the float valve body 2, when the float ball 4 is stuck in the high position, the oil level in the hydrogen-side return oil tank 1 drops rapidly, triggering the level sensor 18 to interlock and close the float valve body 2 and the solenoid valve 6, preventing hydrogen leakage and improving the safety of the sealing oil equipment.

[0025] The front left and right sides of the assembly block 10 are provided with limit holes 13, and there are 2-4 sets of limit holes 13. Each limit hole 13 is equipped with a pin 14, and the front end of each pin 14 is connected to a limit plate 15. The top left and right sides of the filter housing 5 are connected with screw seats 12. The upper side of the inside of the limit plate 15 is equipped with a screw 16, and the screw 16 is screwed into the inside of the screw seat 12. The addition of the filter housing 5 allows the assembly block 10, the cylindrical frame 9 and the filter element 11 to be installed inside it, so that the liquid can be filtered. This prevents impurities from entering the solenoid valve 6 and causing jamming, thus improving the smoothness of equipment operation. In addition, the addition of the differential pressure sensor 8 can detect the pressure difference before and after the filter housing 5 in real time. When the pressure difference exceeds the preset value, an alarm is triggered to prompt the replacement of the filter element 11, thus avoiding the problem of pipeline blockage caused by filter element 11 clogging.

[0026] This solution, by adding a solenoid valve 6 after the float valve body 2, ensures that when the float component 4 is stuck in the high position, the oil level in the hydrogen-side return oil tank 1 drops rapidly, triggering the level sensor 18 to interlock and close the float valve body 2 and the solenoid valve 6, preventing hydrogen leakage and improving the safety of the sealing oil equipment. Simultaneously, the added filter housing 5 allows the mounting block 10, cylindrical frame 9, and filter element 11 to be installed inside, enabling liquid filtration and preventing impurities from entering the solenoid valve 6 and causing jamming, thus improving the smoothness of equipment operation. Furthermore, the added differential pressure sensor 8 can detect the pressure difference before and after the filter housing 5 in real time. When the pressure difference exceeds a preset value, an alarm is triggered to prompt the replacement of the filter element 11, avoiding pipeline blockage caused by filter element 11 clogging.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A single-flow ring type sealing oil device for steam turbines, characterized in that, include: Hydrogen-side return oil tank (1), a float valve body (2) is installed at the return oil port of the hydrogen-side return oil tank (1) through a flange, a connector (3) is installed on the top of the float valve body (2), a float part (4) is inserted inside the connector (3), and liquid level sensors (18) are installed on the lower left and right sides of the inner wall of the hydrogen-side return oil tank (1). The filter housing (5) is installed at the port of the float valve body (2) via a flange. Connecting pipes (7) are installed on both the left and right sides of the filter housing (5). A solenoid valve (6) is installed on the outside of the connecting pipe (7) on the left side via a flange. A differential pressure sensor (8) is installed on the top of the connecting pipe (7). A cylindrical frame (9) is inserted inside the filter housing (5). An assembly block (10) is connected to the front side of the cylindrical frame (9). A filter element (11) is inserted inside the cylindrical frame (9).

2. The turbine single-flow ring sealing oil device according to claim 1, characterized in that: The float component (4) is inserted inside the hydrogen-side return oil tank (1), and sealing rings are snapped into the connecting flanges of the float valve body (2), filter housing (5) and solenoid valve (6) of the hydrogen-side return oil tank (1).

3. The turbine single-flow ring sealing oil device according to claim 1, characterized in that: The contact surfaces of the assembly insert (10) and the cylindrical frame (9) are both semi-circular, and sealing gaskets (17) are snapped onto both outer sides of the assembly insert (10).

4. The turbine single-flow ring sealing oil device according to claim 1, characterized in that: The front left and right sides of the assembly plug (10) are provided with limit holes (13), and the number of limit holes (13) is 2-4 sets. Each limit hole (13) is provided with a pin (14).

5. A single-flow ring type sealing oil device for steam turbines according to claim 4, characterized in that: The front end of each pin (14) is connected to a limiting plate (15), and the top left and right sides of the filter housing (5) are connected to a screw seat (12). The upper inside of each limiting plate (15) is fitted with a screw (16), and the screw (16) is screwed into the inside of the screw seat (12).

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