Lubricating oil supply system of gas turbine

Abstract

The utility model discloses a gas turbine lubricating oil supply system which comprises an oil supply pipeline (1) and a lubricating pipeline (2), and the oil supply pipeline (1) and the lubricating pipeline (2) are in fluid communication and form a loop. The oil supply pipeline (1) comprises a high-level oil tank (11), a low-level oil tank (12) and an oil pump (13), and the low-level oil tank (12) is arranged on the upstream of the high-level oil tank (11); the lubricating pipeline (2) comprises a control valve (21) and a to-be-lubricated device (22), and the control valve (21) is arranged on the upstream of the to-be-lubricated device (22).

Description

Technical Field

[0001] This utility model relates to the field of gas turbine technology, specifically to a gas turbine lubricating oil supply system. Background Technology

[0002] The lubrication system is a key component for the normal operation of a gas turbine generator set. It is responsible for providing the bearings of the unit with lubricating oil that meets the design requirements in terms of pressure, flow rate, temperature, and cleanliness. Through designed pipelines and equipment, it ensures that the lubricating oil can be stably supplied under various operating conditions of the unit, thereby guaranteeing the efficient and reliable operation of the unit.

[0003] The existing lubrication system has the following problems:

[0004] (1) To ensure the stable operation of the lubricating oil system, two main oil pumps, one emergency DC oil pump, accumulator, exhaust fan and other equipment are installed, making the system complex.

[0005] (2) To ensure system safety, the equipment requirements for the lubricating oil pump are high, and a high design margin should be reserved when configuring the system.

[0006] (3) At present, the high-level oil tank system meets the oil supply needs of gas turbine and steam turbine equipment during coasting or is used as a guarantee measure for accident conditions, but it still has certain shortcomings in terms of maintenance complexity and space occupation.

[0007] (4) The existing high-level oil tank system is used in emergency situations, and the lubricating oil in the high-level oil tank is prone to aging.

[0008] Patent document CN115013708A discloses a dual-tank lubricating oil changing and filtering device for large mechanical equipment.

[0009] The system includes a large main pump bearing housing and a matching lubricating oil changing mechanism. The lubricating oil changing mechanism includes a high-level lubricating oil tank, a low-level lubricating oil tank, an oil suction pipe, an oil suction pump, an oil delivery pipe, an oil injection pipe, and an oil injection valve. The large main pump bearing housing and the low-level lubricating oil tank are connected by the oil suction pipe. The lubricating oil in the low-level lubricating oil tank is filtered by a magnetic filter group and then connected to the high-level lubricating oil tank through the oil delivery pipe. The highest oil level point in the inner shell of the large main pump bearing housing is connected to the high-level lubricating oil tank by the oil injection pipe. The high-level lubricating oil tank is installed above the lifting mechanism. However, this system does not solve the challenges to operational stability and safety caused by system complexity, high equipment requirements, maintenance difficulty, and space occupation, as well as the problem of easy aging of lubricating oil in the high-level oil tank.

[0010] Patent document CN115339611A discloses an underwater vehicle lubricating oil supply system and method, including a reliable oil station, a lubricating oil tank, and a lubricating oil accumulator. The reliable oil station is connected to the inlet of the lubricating oil channel inside the generator set through the oil supply main pipe, and the outlet of the lubricating oil channel inside the generator set is connected to the reliable oil station through the return oil pipe. The lubricating oil tank is connected to the oil supply main pipe through the drain oil pipe, and the lubricating oil accumulator is connected to the oil supply main pipe through the first pipe. However, it does not solve the challenges to operational stability and safety caused by system complexity, high equipment requirements, maintenance difficulty, and space occupation, as well as the problem of easy aging of lubricating oil in the high-level oil tank. Utility Model Content

[0011] Based on the above-mentioned technical problems, this utility model proposes a gas turbine lubricating oil supply system to solve the challenges to operational stability and safety caused by system complexity, high equipment requirements, maintenance difficulty and space occupation, as well as the problem of easy aging of lubricating oil in high-level oil tanks.

[0012] To achieve the above objectives, this utility model proposes a gas turbine lubricating oil supply system.

[0013] A gas turbine lubricating oil supply system includes an oil supply pipeline and a lubrication pipeline, which are fluidly connected and form a loop. The oil supply pipeline includes a high-level oil tank, a low-level oil tank, and an oil pump, with the low-level oil tank located upstream of the high-level oil tank. The lubrication pipeline includes a control valve and a device to be lubricated, with the control valve located upstream of the device to be lubricated.

[0014] Furthermore, the upstream inlet of the lubrication pipeline is connected to the downstream outlet of the oil supply pipeline, and the downstream outlet of the lubrication pipeline is connected to the upstream inlet of the oil supply pipeline.

[0015] Furthermore, the oil pump is located on the pipeline between the low-level oil tank and the high-level oil tank.

[0016] Furthermore, the oil supply pipeline also includes a check valve, which is located on the pipeline between the low-level oil tank and the high-level oil tank, and is used to control the backflow of lubricating oil in the pipeline.

[0017] Furthermore, the oil supply pipeline includes an oil cooling device located downstream of the high-level oil tank. The oil cooling device also includes an oil cooler and a temperature control valve, which is used to detect the lubricating oil temperature and control the lubricating oil flow rate according to the temperature.

[0018] Furthermore, the oil supply pipeline includes a filter device, which is located on the pipeline between the cooling oil device and the lubrication pipeline.

[0019] Furthermore, the filtration device includes multiple filters, which are connected in parallel in the pipeline.

[0020] Furthermore, it also includes a liquid level sensor, which is located inside the high-level oil tank and the low-level oil tank.

[0021] Furthermore, the device to be lubricated includes a first bearing, a device body, and a second bearing. The first bearing and the second bearing are respectively connected to a control valve via pipelines and are located downstream of the control valve.

[0022] Furthermore, the first bearing and the second bearing are respectively connected to the low-level oil tank via pipelines.

[0023] Based on the above technical solution, this utility model has at least the following beneficial effects:

[0024] 1. This utility model proposes a gas turbine lubricating oil supply system. By integrating the functions of the lubricating oil system equipment, a high-level oil tank is set up. The height is calculated according to the bearing lubricating oil requirements, generally around 20 meters. Utilizing the principle of gravity-generated pressure, the oil is directly connected to the device to be lubricated through pipelines to meet its lubricating oil pressure requirements. This design simplifies the connection between the oil pump outlet and the bearing of the device to be lubricated, and also reduces the system complexity. In this utility model, the oil pump outlet is no longer directly connected to the bearing of the device to be lubricated. Instead, the bearing return oil flows to the low-level oil tank, and then the oil pump sends the lubricating oil in the low-level oil tank to the high-level oil tank, forming an effective circulation system.

[0025] 2. This utility model proposes a gas turbine lubricating oil supply system. A cooling and filtering device is installed at the outlet of the high-level oil tank to ensure that the temperature and cleanliness of the lubricating oil entering the equipment bearings meet the requirements. By installing level sensors in both the high-level and low-level oil tanks and external check valves, the start and stop of the oil pump are precisely controlled to prevent backflow of lubricating oil, ensuring the stability and reliability of the system. This utility model not only improves the efficiency of lubricating oil supply but also helps extend the service life of the equipment and lubricating oil, reducing maintenance costs.

[0026] 3. This utility model proposes a gas turbine lubricating oil supply system, in which control valves are respectively installed upstream of multiple bearings of the device to be lubricated. This allows for more precise control of the lubricating oil supply to each bearing, ensuring that each bearing receives adequate lubrication and avoiding over- or under-lubrication. This precise control helps improve the overall system operating efficiency and equipment lifespan, while also making maintenance and fault diagnosis easier. Through these measures, the lubricating oil system can operate more stably and efficiently, providing continuous and reliable lubrication for the equipment. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 A schematic diagram of a gas turbine lubricating oil supply system according to one embodiment is shown;

[0029] The above figures include the following reference numerals:

[0030] 1. Oil supply lines; 2. Lubrication lines;

[0031] 11. High-level oil tank; 12. Low-level oil tank; 13. Oil pump; 14. Check valve; 15. Oil cooling device; 16. Filtration device; 17. Liquid level sensor;

[0032] 21. Control valve; 22. Lubrication device;

[0033] 151. Oil cooler; 152. Thermostatic valve;

[0034] 161. Filter;

[0035] 221. First bearing; 222. Main body of the device; 223. Second bearing. Detailed Implementation

[0036] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention. The term "comprising" indicates the presence of a feature, but does not exclude the presence or addition of one or more other features. The terms "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] Example

[0040] Example 1

[0041] This utility model proposes a gas turbine lubricating oil supply system, such as... Figure 1 As shown, it includes an oil supply line 1 and a lubrication line 2, which are fluidly connected and form a loop. The oil supply line 1 includes a high-level oil tank 11, a low-level oil tank 12, and an oil pump 13. The low-level oil tank 12 is located upstream of the high-level oil tank 11. The lubrication line 2 includes a control valve 21 and a device to be lubricated 22. The control valve 21 is located upstream of the device to be lubricated 22.

[0042] Furthermore, the upstream inlet of the lubrication line 2 is connected to the downstream outlet of the oil supply line 1, and the downstream outlet of the lubrication line 2 is connected to the upstream inlet of the oil supply line 1.

[0043] Furthermore, the oil supply pipeline 1 includes an oil pump 13, a check valve 14, an oil cooling device 15, and a filter device 16, which are sequentially arranged downstream of the high-level oil tank 11 along the direction of lubricating oil flow. The oil pump 13 and the check valve 14 are located on the pipeline between the high-level oil tank 11 and the low-level oil tank 12.

[0044] Specifically, such as Figure 1 The intermediate cooling oil device 15 includes an oil cooler 151 and a temperature control valve 152. The oil cooler 151 is connected in parallel to the pipeline, and the temperature control valve 152 is located downstream of the oil cooler 151.

[0045] Specifically, in this embodiment, as follows Figure 1 The filtration device 16 shown includes two filters 161, which are connected in parallel in the pipeline.

[0046] Furthermore, the liquid level sensor 17 is located inside the high-level oil tank 11 and the low-level oil tank 12; each of the high-level oil tank 11 and the low-level oil tank 12 is equipped with two liquid level sensors 17, which are respectively located at 80% height and 20% height inside the high-level oil tank 11 and the low-level oil tank 12.

[0047] Furthermore, the device to be lubricated 22 includes a first bearing 221, a device body 222, and a second bearing 223. The first bearing 221 and the second bearing 223 are respectively connected to the air inlet and the air outlet of the device body 222. The first bearing 221 and the second bearing 223 are respectively connected to a control valve 21 through pipelines and are located downstream of the control valve 21.

[0048] Furthermore, the first bearing 221 and the second bearing 223 are respectively connected to the low-level oil tank 12 through pipelines.

[0049] Example 2

[0050] This utility model proposes a gas turbine lubricating oil supply system, such as... Figure 1 As shown, it includes an oil supply line 1 and a lubrication line 2, which are fluidly connected and form a loop. The oil supply line 1 includes a high-level oil tank 11, a low-level oil tank 12, and an oil pump 13. The low-level oil tank 12 is located upstream of the high-level oil tank 11. The lubrication line 2 includes a control valve 21 and a device to be lubricated 22. The control valve 21 is located upstream of the device to be lubricated 22.

[0051] Furthermore, the upstream inlet of the lubrication line 2 is connected to the downstream outlet of the oil supply line 1, and the downstream outlet of the lubrication line 2 is connected to the upstream inlet of the oil supply line 1.

[0052] Furthermore, the oil supply pipeline 1 includes an oil pump 13, a check valve 14, an oil cooling device 15, and a filter device 16, which are sequentially arranged downstream of the high-level oil tank 11 along the direction of lubricating oil flow. The oil pump 13 and the check valve 14 are located on the pipeline between the high-level oil tank 11 and the low-level oil tank 12.

[0053] Specifically, such as Figure 1 The intermediate cooling oil device 15 includes an oil cooler 151 and a temperature control valve 152. The oil cooler 151 is connected in parallel to the pipeline, and the temperature control valve 152 is located downstream of the oil cooler 151.

[0054] Furthermore, in this embodiment, the filtration device 16 includes three filters 161, which are connected in parallel in the pipeline.

[0055] Furthermore, the liquid level sensor 17 is located inside the high-level oil tank 11 and the low-level oil tank 12; each of the high-level oil tank 11 and the low-level oil tank 12 is equipped with two liquid level sensors 17, which are respectively located at 70% height and 30% height inside the high-level oil tank 11 and the low-level oil tank 12.

[0056] Furthermore, the device to be lubricated 22 includes two first bearings 221, a device body 222, and a second bearing 223. The two first bearings 221 are both located at the air inlet of the device body 222, and the second bearing 223 is located at the exhaust port of the device body 222. The two first bearings 221 and the second bearing 223 are respectively connected to a control valve 21 through pipelines and are located downstream of the control valve 21. In other embodiments, multiple second bearings 223 may be provided at the exhaust port of the device body 222.

[0057] Furthermore, the first bearing 221 and the second bearing 223 are respectively connected to the low-level oil tank 12 through pipelines.

[0058] In summary, as can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0059] 1. This utility model proposes a gas turbine lubricating oil supply system. By integrating the functions of the lubricating oil system equipment, a high-level oil tank is set up. The height is calculated according to the bearing lubricating oil requirements, generally around 20 meters. Utilizing the principle of gravity-generated pressure, the oil is directly connected to the device to be lubricated through pipelines to meet its lubricating oil pressure requirements. This design simplifies the connection between the oil pump outlet and the bearing of the device to be lubricated, and also reduces the system complexity. In this utility model, the oil pump outlet is no longer directly connected to the bearing of the device to be lubricated. Instead, the bearing return oil flows to the low-level oil tank, and then the oil pump sends the lubricating oil in the low-level oil tank to the high-level oil tank, forming an effective circulation system.

[0060] 2. This utility model proposes a gas turbine lubricating oil supply system. A cooling and filtering device is installed at the outlet of the high-level oil tank to ensure that the temperature and cleanliness of the lubricating oil entering the equipment bearings meet the requirements. By installing level sensors in both the high-level and low-level oil tanks and external check valves, the start and stop of the oil pump are precisely controlled to prevent backflow of lubricating oil, ensuring the stability and reliability of the system. This utility model not only improves the efficiency of lubricating oil supply but also helps extend the service life of the equipment and lubricating oil, reducing maintenance costs.

[0061] 3. This utility model proposes a gas turbine lubricating oil supply system, in which control valves are respectively installed upstream of multiple bearings of the device to be lubricated. This allows for more precise control of the lubricating oil supply to each bearing, ensuring that each bearing receives adequate lubrication and avoiding over- or under-lubrication. This precise control helps improve the overall system operating efficiency and equipment lifespan, while also making maintenance and fault diagnosis easier. Through these measures, the lubricating oil system can operate more stably and efficiently, providing continuous and reliable lubrication for the equipment.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0064] It should be noted that, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A gas turbine lubricating oil supply system, characterized in that, It includes an oil supply line (1) and a lubrication line (2), which are fluidly connected and form a loop; the oil supply line (1) includes a high-level oil tank (11), a low-level oil tank (12) and an oil pump (13), with the low-level oil tank (12) located upstream of the high-level oil tank (11); the lubrication line (2) includes a control valve (21) and a device to be lubricated (22), with the control valve (21) located upstream of the device to be lubricated (22).

2. The system according to claim 1, characterized in that, The upstream inlet of the lubrication pipeline (2) is connected to the downstream outlet of the oil supply pipeline (1), and the downstream outlet of the lubrication pipeline (2) is connected to the upstream inlet of the oil supply pipeline (1).

3. The system according to claim 1, characterized in that, The oil pump (13) is located on the pipeline between the low-level oil tank (12) and the high-level oil tank (11).

4. The system according to claim 1, characterized in that, The oil supply line (1) also includes a check valve (14). The check valve (14) is located on the pipeline between the low-level oil tank (12) and the high-level oil tank (11) to control the backflow of lubricating oil in the pipeline.

5. The system according to claim 1, characterized in that, The oil supply line (1) includes an oil cooling device (15). The oil cooling device (15) is located downstream of the high-level oil tank (11). The oil cooling device (15) also includes an oil cooler (151) and a temperature control valve (152). The temperature control valve (152) is used to detect the temperature of the lubricating oil and control the flow rate of the lubricating oil according to the temperature.

6. The system according to claim 5, characterized in that, The oil supply line (1) includes a filter device (16). The filter device (16) is located on the pipeline between the oil cooling device (15) and the lubrication pipeline (2).

7. The system according to claim 6, characterized in that, The filtration device (16) includes a plurality of filters (161), Multiple filters (161) are connected in parallel in the pipeline.

8. The system according to claim 1, characterized in that, It also includes a liquid level sensor (17), which is located inside the high-level oil tank (11) and the low-level oil tank (12).

9. The system according to claim 1, characterized in that, The device to be lubricated (22) includes a first bearing (221), a device body (222), and a second bearing (223). The first bearing (221) and the second bearing (223) are respectively connected to a control valve (21) via pipelines and are located downstream of the control valve (21).

10. The system according to claim 9, characterized in that, The first bearing (221) and the second bearing (223) are respectively connected to the low-level oil tank (12) through pipelines.

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