Lubricating oil return system, lubricating system and turbine lubricating system

Abstract

The utility model provides a lubrication oil return system, a lubrication system and a turbine lubrication system. The lubrication oil return system comprises a first oil pool, a second oil pool, a siphon oil return pipeline and a driving pipeline. The first oil pool is used for storing and collecting lubricating oil; the second oil pool is used for recycling the lubricating oil, and the liquid level in the second oil pool is lower than the liquid level of the first oil pool; the siphon oil return pipeline comprises a liquid suction end and a liquid outlet end, the liquid suction end is communicated with the first oil pool, and the liquid outlet end is communicated with the second oil pool; and the driving pipeline is connected with the target section of the siphon oil return pipeline in parallel, a fluid driving element is arranged on the driving pipeline, and a first stop valve is arranged on the target section. According to the scheme, conveying of lubricating oil is achieved through the siphon effect, the oil return pipeline does not need to be strictly arranged downwards in an inclined mode, only the height difference between the first oil pool and the second oil pool needs to be guaranteed, the arrangement requirement of the oil return pipeline is lowered, and pipeline arrangement in a complex environment is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of lubricating oil return, in particular to a lubricating oil return system, a lubricating system and a steam turbine lubricating system. Background Art

[0002] A lubrication oil return system is an oil circulation system used in mechanical devices, which generally requires the oil to be transported from one place to another.

[0003] Taking steam turbine as an example, its lubrication system usually uses half-pipe gravity oil return to achieve oil return, specifically, a sloped pipeline is set between two oil storage locations with a height difference, and then the lubricating oil can be transported from top to bottom along the pipeline. However, when laying out the pipeline, it needs to be laid out gradually downward in strict accordance with the slope, which places high requirements on civil engineering for large pipelines. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a lubrication oil return system, a lubrication system and a steam turbine lubrication system to reduce the requirements for the layout of pipelines.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a lubrication oil return system, comprising:

[0006] The first oil pool is used to store and collect lubricating oil;

[0007] A second oil pool, used to recover the lubricating oil, the liquid level in the second oil pool being lower than the liquid level in the first oil pool;

[0008] A siphon oil return pipeline, comprising a liquid suction end and a liquid discharge end, wherein the liquid suction end is connected to the first oil pool, and the liquid discharge end is connected to the second oil pool;

[0009] A drive pipeline is connected in parallel with the target section of the siphon oil return pipeline. A fluid drive element is arranged on the drive pipeline, and a first stop valve is arranged in the target section.

[0010] In an optional embodiment of the utility model, it also includes a siphon breaking pipeline, one end of which is connected to the siphon oil return pipeline, and the other end is connected to the outside world. A second stop valve is provided on the siphon breaking pipeline, and both ends of the siphon breaking pipeline are higher than the liquid level of the first oil pool.

[0011] In an optional embodiment of the utility model, the driving pipeline includes a pre-pump pipeline and a post-pump pipeline which are arranged in sequence along the flow direction, the fluid driving element is arranged between the pre-pump pipeline and the post-pump pipeline, the post-pump pipeline is connected with an exhaust pipe, and the exhaust pipe is provided with an exhaust pipe valve.

[0012] In an optional embodiment of the present utility model, a fifth stop valve is provided on the front pipeline of the pump, and a first check valve and a third stop valve are provided on the rear pipeline of the pump downstream of the exhaust pipe.

[0013] In an optional embodiment of the present invention, the siphon breaking pipeline is arranged in the siphon oil return pipeline upstream of the target section.

[0014] In an optional embodiment of the present invention, the height of the upstream end of the target section is lower than the liquid level of the first oil pool and higher than the liquid level of the second oil pool.

[0015] In an optional embodiment of the present invention, a fourth stop valve is provided on the siphon oil return pipeline downstream of the target section, and a second check valve is provided on the target section upstream of the first stop valve.

[0016] In an optional embodiment of the present invention, an observation window for observing oil is provided on the target section upstream of the second check valve.

[0017] The utility model also proposes a lubrication system, characterized in that it includes the above-mentioned lubrication oil return system, and a plurality of the lubrication oil return systems share the second oil pool and the siphon oil return pipeline downstream of the target section.

[0018] The utility model also proposes a steam turbine lubrication system, comprising:

[0019] Steam turbine bearing seat, used to store and collect lubricating oil;

[0020] A lubricating main oil tank, used for recovering the lubricating oil, wherein the liquid level in the lubricating main oil tank is lower than the liquid level in the turbine bearing seat;

[0021] A siphon oil return pipeline, comprising a liquid suction end and a liquid discharge end, wherein the liquid suction end is communicated with the turbine bearing seat, and the liquid discharge end is communicated with the lubrication main oil tank;

[0022] A drive pipeline is connected in parallel with the target section of the siphon oil return pipeline. A fluid drive element is arranged on the drive pipeline, and a first stop valve is arranged in the target section.

[0023] The utility model provides a lubricating oil return system, a lubricating system and a steam turbine lubricating system. In the above scheme, the lubricating oil is transported by the siphon effect, so that the oil return pipeline does not need to be arranged strictly in a downward inclination, and it is sufficient to ensure the height difference between the first oil pool and the second oil pool, thereby reducing the layout requirements of the oil return pipeline and facilitating the layout of the pipeline in a complex environment. Without the strict inclination requirement for the oil return pipeline, the engineering complexity in the design and installation process can be reduced, saving time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a structural schematic diagram of a lubrication oil return system in a specific embodiment of the utility model;

[0026] Figure 2 It is a structural schematic diagram of a lubrication system in a specific embodiment of the utility model.

[0027] Explanation of the reference numerals: 10, first oil pool; 20, second oil pool; 30, siphon oil return pipeline; 31, target section; 32, first stop valve; 33, fourth stop valve; 34, second check valve; 35, observation window; 40, drive pipeline; 41, fluid drive element; 42, first check valve; 43, third stop valve; 44, fifth stop valve; 50, siphon destruction pipeline; 51, second stop valve; 60, exhaust pipe; 61, exhaust pipe valve. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0029] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0030] In the prior art, since the lubricating oil in the gravity return pipe will generally only fill half of the gravity return pipe, it is called half-pipe gravity return. The half-pipe gravity return method is a common layout method in the lubrication return system, but it has some disadvantages. Since the pipeline needs to be arranged gradually downward in strict accordance with the slope, it has high requirements for civil engineering projects. Especially in large pipelines, factors such as terrain and buildings need to be considered, which increases the difficulty and cost of the project. Since the oil is driven by gravity, if there is a blockage or blockage inside the pipeline, it will affect the normal return of the lubricating oil, which may cause insufficient lubrication or damage to the mechanical equipment. At the same time, since the lubricating oil generally does not fill the gravity return pipe, this will result in insufficient flow of the lubricating oil, or the diameter of the gravity return pipe is too large, resulting in high material and labor costs.

[0031] like Figure 1 As shown, the utility model provides a lubrication oil return system, including a first oil pool 10 , a second oil pool 20 , a siphon oil return pipeline 30 and a drive pipeline 40 .

[0032] The first oil pool 10 is used to store and collect lubricating oil, and the second oil pool 20 is used to recover the lubricating oil. The liquid level in the second oil pool 20 is lower than the liquid level in the first oil pool 10. The first oil pool 10 and the second oil pool 20 are only used to distinguish the two storage locations of the lubricating oil, and the first oil pool 10 and the second oil pool 20 are not strictly limited to pool-shaped structures. They can be containers of any shape and size.

[0033] The siphon oil return pipeline 30 includes a liquid suction end and a liquid discharge end, wherein the liquid suction end is connected to the first oil pool 10, and the liquid discharge end is connected to the second oil pool 20. The siphon effect uses gravity to realize the automatic flow of oil, without the need for additional energy input, thereby reducing energy consumption and conforming to the concept of energy conservation and environmental protection. It is only necessary to ensure that the liquid suction end is connected to the first oil pool 10 and the liquid discharge end is connected to the second oil pool 20. This simplifies the layout and installation process of the system. Since there is no need to strictly arrange the pipeline in a gradually inclined downward direction, the siphon oil return pipeline 30 can reduce civil engineering requirements, reduce restrictions on terrain and buildings, and thus save design and construction costs. The siphon oil return pipeline 30 can stably recover the lubricating oil to the second oil pool 20, avoiding the problem of insufficient lubrication caused by improper pipeline layout or mechanical pump failure, and improving the stability and reliability of the system.

[0034] The suction end of the siphon oil return pipeline 30 can be inserted below the liquid level of the first oil pool 10 in an inverted U shape, and the liquid outlet end of the siphon oil return pipeline 30 can be inserted below the liquid level of the second oil pool 20 from top to bottom. In this way, there is no need to change the structure of the original first oil pool 10 and the second oil pool 20. Through the inverted U shape and the insertion from top to bottom, the connection of the return oil pipeline can be achieved without changing the structure of the first oil pool 10 and the second oil pool 20, reducing the need for modification and rearrangement of the oil pool. This design simplifies the installation process of the return oil pipeline, and there is no need to significantly modify the oil pool or add additional structures, saving installation time and cost. The suction end and the liquid outlet end of the siphon oil return pipeline 30 are connected to the oil pool by an inverted U shape and insertion from top to bottom, which can effectively maintain the connection state below the liquid level and maintain the stability and reliability of the system. The hydraulic pressure generated by the height difference between the upper end of the inverted U-shaped pipeline and the liquid level of the first oil pool 10 is not greater than the local atmospheric pressure.

[0035] The drive pipeline 40 is connected in parallel with the target section 31 of the siphon oil return pipeline 30, and a fluid drive element 41 is provided on the drive pipeline 40, and the target section 31 is provided with a first stop valve 32. The upstream end height of the target section 31 is lower than the liquid level in the first oil pool 10, wherein the fluid drive element 41 can be a diaphragm pump. When it is necessary to establish a siphon, the first stop valve 32 is closed first, and then the fluid drive element 41 is started. Under the action of the fluid drive element 41, the oil fills the siphon oil return pipeline 30 and the drive pipeline 40 upstream of the target section 31. At this time, the fluid drive element 41 is closed, and the first stop valve 32 is opened again, and the oil can enter the target section 31 to fill the entire siphon oil return pipeline 30 to establish a siphon effect. Upstream and downstream in this application refer to the upstream and downstream of the oil flow direction.

[0036] The driving pipeline 40 can also be started after the siphon effect is established to increase the return flow rate of the lubricating oil.

[0037] like Figure 1 As shown, it also includes a siphon destroying pipeline 50, one end of which is connected to the siphon return oil pipeline 30, and the other end is connected to the outside world. A second stop valve 51 is provided on the siphon destroying pipeline 50, and both ends of the siphon destroying pipeline 50 are higher than the liquid level of the first oil pool 10. When necessary, the second stop valve 51 can be opened to allow air to enter the siphon return oil pipeline 30 from the siphon destroying pipeline 50, thereby destroying the siphon effect. By setting the siphon destroying pipeline 50, the siphon effect can be flexibly broken when necessary to stop the reflux of the liquid. This makes the system operation more flexible and the flow of the liquid can be controlled at any time as needed. In some cases, it is necessary to stop the reflux of the liquid, such as when performing maintenance, cleaning or replacing the liquid. By opening the second stop valve 51 on the siphon destroying pipeline 50, the reflux of the liquid can be effectively prevented, which increases the safety of the operation.

[0038] like Figure 1 As shown, the driving pipeline 40 includes a pump front pipeline and a pump rear pipeline which are sequentially connected and arranged along the flow direction, and the fluid driving element 41 is arranged between the pump front pipeline and the pump rear pipeline, and an exhaust pipe 60 is connected and arranged on the pump rear pipeline, and an exhaust pipeline valve 61 is arranged on the exhaust pipe 60. The exhaust pipe 60 is used to remove the gas in the driving pipeline 40. The exhaust pipe 60 is arranged on the pump rear pipeline, so that the gas in the pipeline can be easily removed. The setting of the exhaust pipe 60 can ensure that there is no gas in the pipeline to block the flow of the fluid, and ensure the normal operation of the driving pipeline 40. At the same time, the setting of the exhaust pipe 60 can also be used to determine whether the driving pipeline 40 is filled with oil. When the exhaust pipeline valve 61 is opened, if the gas is discharged, it means that there may be gas in the pipeline and it is not completely filled with oil, and further processing is required. The exhaust pipeline valve 61 can be a stop valve or an exhaust valve, and its main function is to control the discharge of gas. The exhaust pipe valve 61 can be used to conveniently control the amount of gas discharged, so that the gas in the driving pipeline 40 can be discharged in time.

[0039] like Figure 1 As shown, a fifth stop valve 44 is provided on the pipeline before the pump, and a first check valve 42 and a third stop valve 43 are provided on the pipeline after the pump downstream of the exhaust pipe 60. The first check valve 42 can prevent backflow, while the third stop valve 43 can control the discharge of gas to ensure that the fluid in the pipeline is stable and continuous. The setting of these valves can ensure the stability and reliability of the system. By controlling the flow of fluid and the discharge of gas, the fluctuations and unstable factors that may occur in the system can be reduced, and the operating efficiency and reliability of the system can be improved.

[0040] like Figure 1 As shown, the siphon breaking pipeline 50 is arranged in the siphon oil return pipeline 30 upstream of the target section 31. By being arranged in the upstream position, the flow of the liquid can be controlled in advance. In this way, the flow of the liquid can be adjusted more timely to ensure that the liquid flows along the expected path without causing unexpected liquid backflow.

[0041] In an optional embodiment of the present invention, the height of the upstream end of the target section 31 is lower than the liquid level of the first oil pool 10 and higher than the liquid level in the second oil pool 20. By setting the height of the upstream end of the target section 31 at such a position, the flow of the liquid can be better controlled.

[0042] like Figure 1As shown, a fourth stop valve 33 is provided on the siphon oil return pipeline 30 downstream of the target section 31, and a second check valve 34 is provided on the target section 31 upstream of the first stop valve 32. The setting of the first stop valve 32 and the fourth stop valve 33 can effectively control the flow of liquid in the siphon oil return pipeline 30. These valves can be opened or closed as needed to adjust the flow rate and flow direction of the liquid to ensure the normal operation of the system. The second check valve 34 is set on the target section 31 upstream of the first stop valve 32 to prevent the liquid from flowing back to the section. This helps to maintain the stability of the liquid in the target section 31 and prevent the liquid from causing unnecessary influence or damage to the system.

[0043] like Figure 1 As shown, an observation window 35 for observing the oil is provided on the target section 31 upstream of the second check valve 34. The observation window 35 allows the operator to easily monitor the state of the oil, including color, turbidity, bubbles, etc. This helps to promptly detect whether the oil is contaminated or whether there are other abnormal conditions. By observing the oil through the observation window 35, potential problems or signs of failure can be discovered in advance. If the oil is found to be abnormal, the operator can take timely measures to prevent the problem from further deteriorating and ensure the normal operation of the system. By regularly observing the oil, potential safety hazards, such as oil leakage or contamination, can be discovered in a timely manner. This helps to improve the safety of equipment and personnel and reduce the occurrence of accidents.

[0044] like Figure 2 As shown, the utility model also proposes a lubrication system, characterized in that it includes the above-mentioned lubrication oil return system, and multiple lubrication oil return systems share the second oil pool 20 and the siphon oil return pipeline 30 downstream of the target section 31. By sharing the second oil pool 20 and the siphon oil return pipeline 30 by multiple systems, effective sharing of resources can be achieved. This can save the cost of duplicate construction of equipment and pipelines, and reduce the consumption of raw materials and energy. The centralized use of one second oil pool 20 and siphon oil return pipeline 30 can save space, which is particularly important when multiple lubrication oil return systems are deployed in a limited site. This can make the equipment layout more compact and improve site utilization. The centralized use of one siphon oil return pipeline 30 can simplify maintenance and management work. Maintenance personnel only need to pay attention to one pipeline system instead of multiple scattered systems, which can reduce maintenance costs and improve maintenance efficiency.

[0045] like Figure 1 As shown, the utility model also proposes a steam turbine lubrication system, including a steam turbine bearing seat, a lubrication main oil tank, a siphon oil return pipeline 30 and a drive pipeline 40.

[0046] The turbine bearing seat is used to store and collect lubricating oil; the lubricating main oil tank is used to recover the lubricating oil, and the liquid level in the lubricating main oil tank is lower than the liquid level of the turbine bearing seat; the siphon oil return pipeline 30 includes a liquid suction end and a liquid discharge end, the liquid suction end is connected to the turbine bearing seat, and the liquid discharge end is connected to the lubricating main oil tank; the drive pipeline 40 is connected in parallel with the target section 31 of the siphon oil return pipeline 30, and the drive pipeline 40 is provided with a fluid drive element 41, and the target section 31 is provided with a first stop valve 32. That is, the solution in the present application is applied to the turbine bearing seat, and the turbine bearing seat requires a large lubrication system, which is generally returned by gravity. The use of siphon oil return can reduce the layout requirements of the return oil pipeline.

[0047] The lubrication oil return system in this application can work according to the following steps:

[0048] The fourth stop valve 33 and the first stop valve 32 are closed, the fifth stop valve 44 and the exhaust pipe valve 61 are opened, and the fluid driving element 41 is started to evacuate the pipeline in front of the fluid driving element 41, so that the lubricating oil fills the siphon return oil pipeline 30 upstream of the target section 31 under atmospheric pressure, and then the fluid driving element 41 pumps the lubricating oil into the pipeline after the pump.

[0049] When there is no obvious gas discharge from the exhaust pipe 60, it indicates that the siphon oil return pipeline 30 upstream of the target section 31 is full of oil. When the fluid drive element 41 is running, the first stop valve 32 and the fourth stop valve 33 are opened in sequence to establish siphoning in the pipeline, and the exhaust pipeline valve 61 is closed.

[0050] After the siphon is established, the fluid driving element 41 can be closed or continue to operate. The first stop valve 32 and the fourth stop valve 33 can be flow regulating valves. The siphon flow is adjusted by the first stop valve 32 and the fourth stop valve 33. In special cases, the second stop valve 51 of the siphon breaking pipe can be opened to inject air to quickly break the siphon.

[0051] In summary, the utility model proposes a lubricating oil return system, a lubricating system and a steam turbine lubricating system. In the above scheme, the lubricating oil is transported by the siphon effect, so that the oil return pipeline does not need to be arranged strictly in a downward inclination, as long as the height difference between the first oil pool and the second oil pool is ensured, thereby reducing the layout requirements of the oil return pipeline and facilitating the layout of the pipeline in a complex environment. Without the strict inclination requirements for the oil return pipeline, the engineering complexity in the design and installation process can be reduced, saving time and cost.

[0052] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with this technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention. Efficiently realize the connection between the high voltage of the motor and the high voltage of the controller, small size, oil-resistant sealing design, reliable sealing of the controller cavity and the motor cavity, oil cooling design of the lubrication return oil system, lubrication system and turbine lubrication system, effectively reduce the temperature, achieve greater flow and increase product life.

[0053] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more specific details or by other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0054] References throughout the specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. In addition, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0055] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0056] In addition, unless otherwise explicitly indicated, any marking arrows in the drawings should be regarded as exemplary only and not limiting. In addition, unless otherwise indicated, the term "or" used herein is generally intended to mean "and / or". In the case where the term is not clear because it is anticipated that the ability to separate or combine is provided, the combination of components or steps will also be regarded as indicated.

[0057] As used in the description herein and throughout the claims that follow, "a", "an", and "the" include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on" unless otherwise indicated.

[0058] The above description of the illustrated embodiments of the present invention (including that described in the Abstract of the Specification) is not intended to be an exhaustive list or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention as will be recognized and understood by those skilled in the art. As noted, these modifications may be made to the present invention in accordance with the above description of the embodiments described in the present invention, and these modifications will be within the spirit and scope of the present invention.

[0059] Systems and methods have been generally described herein as details that are helpful for understanding the present invention. In addition, various specific details have been given to provide an overall understanding of the embodiments of the present invention. However, those skilled in the relevant art will recognize that the embodiments of the present invention can be practiced without one or more specific details, or practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusion with various aspects of the embodiments of the present invention.

[0060] Thus, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the above disclosure, and it should be understood that in some cases, some features of the present invention will be adopted without corresponding use of other features without departing from the scope and spirit of the proposed utility model. Therefore, many modifications can be made to adapt specific environments or materials to the essential scope and spirit of the present utility model. The present utility model is not intended to be limited to the specific terms used in the claims below and / or the specific embodiments disclosed as the best mode for carrying out the present utility model, but the present utility model will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present utility model will be determined solely by the appended claims.

Claims

1. A lubrication oil return system, characterized in that: include: A first oil pool, used for storing and collecting lubricating oil; A second oil pool, used to recover the lubricating oil, the liquid level in the second oil pool being lower than the liquid level in the first oil pool; A siphon oil return pipeline, comprising a liquid suction end and a liquid discharge end, wherein the liquid suction end is connected to the first oil pool, and the liquid discharge end is connected to the second oil pool; A drive pipeline is connected in parallel with the target section of the siphon oil return pipeline. A fluid drive element is arranged on the drive pipeline, and a first stop valve is arranged in the target section.

2. The lubrication oil return system according to claim 1, characterized in that: It also includes a siphon breaking pipeline, one end of which is connected to the siphon oil return pipeline, and the other end is connected to the outside. A second stop valve is arranged on the siphon breaking pipeline, and both ends of the siphon breaking pipeline are higher than the liquid level of the first oil pool.

3. The lubrication oil return system according to claim 1, characterized in that: The driving pipeline includes a pre-pump pipeline and a post-pump pipeline which are sequentially connected along the flow direction, the fluid driving element is arranged between the pre-pump pipeline and the post-pump pipeline, an exhaust pipe is connected to the post-pump pipeline, and an exhaust pipeline valve is arranged on the exhaust pipe.

4. The lubrication oil return system according to claim 3, characterized in that: A fifth stop valve is arranged on the pump front pipeline, and a first check valve and a third stop valve are arranged on the pump rear pipeline downstream of the exhaust pipe.

5. The lubrication oil return system according to claim 2, characterized in that: The siphon breaking pipeline is arranged on the siphon oil return pipeline upstream of the target section.

6. The lubrication oil return system according to claim 5, characterized in that: The height of the upstream end of the target section is lower than the liquid level of the first oil pool and higher than the liquid level of the second oil pool.

7. The lubrication oil return system according to claim 5, characterized in that: A fourth stop valve is provided on the siphon oil return pipeline downstream of the target section, and a second check valve is provided on the target section upstream of the first stop valve.

8. The lubrication oil return system according to claim 7, characterized in that: An observation window for observing oil is provided on the target section upstream of the second check valve.

9. A lubrication system, characterized in that: It comprises a plurality of lubricating oil return systems as described in any one of claims 1 to 8, wherein the plurality of lubricating oil return systems share the second oil pool and the siphon oil return pipeline downstream of the target section.

10. A steam turbine lubrication system, characterized in that: include: Steam turbine bearing seat, used to store and collect lubricating oil; A lubricating main oil tank, used for recovering the lubricating oil, wherein the liquid level in the lubricating main oil tank is lower than the liquid level in the turbine bearing seat; A siphon oil return pipeline, comprising a liquid suction end and a liquid discharge end, wherein the liquid suction end is communicated with the turbine bearing seat, and the liquid discharge end is communicated with the lubrication main oil tank; A drive pipeline is connected in parallel with the target section of the siphon oil return pipeline. A fluid drive element is arranged on the drive pipeline, and a first stop valve is arranged in the target section.

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