CN115045989A

CN115045989A - Transmission lubricating system and fan

Info

Publication number: CN115045989A
Application number: CN202210848916.7A
Authority: CN
Inventors: 杨敏; 杨学兰; 孙义忠; 陈伟
Original assignee: Nanjing High Speed Gear Manufacturing Co Ltd
Current assignee: Nanjing High Speed Gear Manufacturing Co Ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2022-09-13

Abstract

The invention relates to the technical field of fan lubrication, in particular to a transmission lubricating system and a fan. The transmission lubricating system comprises an oil tank, a pump set and an oil locking valve. The oil tank is used for storing lubricating oil, and the pump package can be poured into main shaft bearing's bearing room and gear box respectively and through returning oil pipe way backward flow to the oil tank with the lubricating oil in the oil tank through the oil supply line. The oil locking valve is arranged on the oil return pipeline and is closed when the pump set is powered off, so that lubricating oil is reserved in the bearing chamber and the gear box. The fan comprises the transmission lubricating system, the main shaft bearing and the gear box are integrated, the installation space is saved, and the synchronous control on the lubrication of the main shaft bearing and the gear box is facilitated. When the pump set is powered off, the oil locking valve is closed, and lubricating oil is reserved in the bearing chamber and the gear box, so that the risk of oil-free lubrication failure of the main shaft bearing and the gear box in the power-off state is avoided, and the safety of the main shaft bearing and the gear box is improved.

Description

Transmission lubricating system and fan

Technical Field

The invention relates to the technical field of fan lubrication, in particular to a transmission lubricating system and a fan.

Background

With the rapid development of wind power, megawatt-class gearboxes are in endless, and are developed to be above 15MW class at present. When the megawatt wind generating set operates, wind power drives the wind wheel to rotate, and the wind wheel drives the main shaft on the gear box to rotate, so that kinetic energy is input into the gear pair.

The transmission chain in the fan is in transmission connection with the main shaft through the gear box, and three-point support (namely, a main shaft bearing is sleeved on the main shaft) or four-point support (namely, two main shaft bearings are sleeved on the main shaft) is mainly adopted. Currently, the lubrication system of a gearbox is mounted in the box of the gearbox or on the nacelle stand of the fan. The lubricating system of the gear box comprises a motor pump set, a filter assembly, a control valve block, a cooler (air cooling or water cooling) and related pipeline accessories. And the main shaft bearing is lubricated by lubricating grease or an independent lubricating and cooling system. The main shaft bearing and the gear box are respectively provided with an independent lubricating system, so that the occupied space is large and the cost is high. Meanwhile, when the fan is in standby or power-off, the main shaft bearing and the gear box are difficult to synchronously control under the lubricating condition, and the risk of oil-free lubrication is easily caused.

Therefore, a transmission lubrication system and a fan are needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a transmission lubricating system and a fan, so as to realize integrated lubrication of a main shaft bearing and a gear box and avoid oil-free lubrication failure of the main shaft bearing and the gear box in a power-off state.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a transmission lubrication system comprising:

an oil tank for storing lubricating oil;

the pump set is configured to inject the lubricating oil in the oil tank into a bearing chamber of a main shaft bearing and a gear box respectively through an oil supply pipeline and return the lubricating oil to the oil tank through an oil return pipeline; and

the oil locking valve is arranged on the oil return pipeline; the oil lock valve closes when the pump stack is de-energized to retain the oil in the bearing chamber and in the gear box.

As a preferred scheme, the box body of the gearbox is the oil tank, and the bearing chamber is communicated with the box body of the gearbox through the oil return pipeline;

or the bearing chamber and the gear box are communicated with the oil tank through the corresponding oil return pipelines respectively, and the two oil return pipelines are provided with the oil locking valves respectively.

Preferably, the transmission lubricating system further comprises:

the pump set and the filter are sequentially arranged on the oil supply pipeline along the flowing direction of the lubricating oil in the oil supply pipeline; the filter is configured to filter the lubricating oil in the oil supply line.

As a preferred scheme, the oil supply pipeline comprises a main pipeline and two branch pipelines, and one ends of the two branch pipelines are respectively communicated with the bearing chamber and the gear box; one end of the main pipeline is communicated with the pump set, and the filter is arranged at one end, close to the branch pipeline, of the main pipeline;

the transmission lubrication system further comprises:

a cooler disposed on one of the branch lines; and

the filter and the temperature control valve are sequentially arranged on the main pipeline along the flowing direction of the lubricating oil in the main pipeline;

when the temperature of the lubricating oil in the main pipeline is greater than a first preset value, the temperature control valve communicates the main pipeline with the branch pipeline provided with the cooler; when the temperature of the lubricating oil in the main pipeline is less than or equal to a first preset value, the temperature control valve communicates the main pipeline with the other branch pipeline.

Preferably, the transmission lubricating system further comprises:

two ends of the overflow pipeline are respectively communicated with the main pipeline and the oil tank;

a first pressure sensor configured to acquire a pressure value of the lubricating oil within the main pipeline; and

the overflow valve is arranged on the overflow pipeline; the overflow valve is configured to open when the pressure value collected by the first pressure sensor is greater than a second preset value, so that the lubricating oil in the main pipeline flows back to the oil tank through the overflow pipeline.

Preferably, the transmission lubricating system further comprises:

and the pressure interface is arranged on the overflow pipeline.

Preferably, the transmission lubricating system further comprises:

the two ends of the exhaust pipeline are respectively communicated with the oil supply pipeline and the gear box; and

the exhaust valve is arranged on the exhaust pipeline and is configured to exhaust the air in the main pipeline and the filter into the gear box through the exhaust pipeline when being opened.

Preferably, the oil supply pipeline and the oil return pipeline are both in flexible connection with the bearing chamber and the gear box.

Preferably, the transmission lubrication system comprises a plurality of groups of oil supply pipelines which are arranged in parallel, and the pump groups are arranged on the oil supply pipelines in a one-to-one correspondence manner.

A fan comprises the transmission lubricating system.

The beneficial effects of the invention are as follows:

according to the transmission lubricating system provided by the invention, the pump set respectively injects the lubricating oil in the oil tank into the bearing chamber of the main shaft bearing and the gear box through the oil supply pipeline and returns to the oil tank through the oil return pipeline, so that the transmission lubricating system can respectively lubricate the main shaft bearing and the gear box, the lubricating systems of the main shaft bearing and the gear box are integrated, the structure is simplified, the installation space of the transmission lubricating system is saved, and the synchronous control on the lubrication of the main shaft bearing and the gear box is facilitated. When the pump set is powered off, the oil locking valve on the oil return pipeline is closed, and lubricating oil cannot flow back to the oil tank through the oil return pipeline, so that the lubricating oil is reserved in the bearing chamber and the gear box, the risk of oil-free lubrication failure of the main shaft bearing and the gear box in a power-off state is avoided, and the safety of the main shaft bearing and the gear box is improved.

The fan provided by the invention comprises the transmission lubricating system, the transmission lubricating system can respectively lubricate the main shaft bearing and the gear box, the lubricating system of the main shaft bearing and the gear box is integrated, and the structure is simplified, so that the installation space of the transmission lubricating system is saved, and the synchronous control on the lubrication of the main shaft bearing and the gear box is facilitated. When the pump package outage, lock oil valve on the oil return pipeline is closed, and lubricating oil can not make lubricating oil remain in the bearing room and in the gear box through returning oil pipeline backward flow to the oil tank to main shaft bearing and gear box appear the risk of oil-free lubrication inefficacy under the avoided power-off state, have improved the security of fan.

Drawings

FIG. 1 is a schematic diagram of a distribution of a transmission lubrication system according to an embodiment of the present invention;

FIG. 2 is a schematic distribution diagram of a transmission lubrication system according to a second embodiment of the present invention.

The component names and designations in the drawings are as follows:

100. a bearing chamber; 200. a gear case;

1. an oil tank; 2. a pump unit; 3. an oil locking valve; 4. a filter; 5. an oil supply line; 51. a main pipeline; 52. a branch pipeline; 6. a cooler; 7. a temperature control valve; 8. an overflow line; 9. a first pressure sensor; 10. an overflow valve; 11. a pressure interface; 12. an exhaust line; 13. an exhaust valve; 14. an oil return line; 15. a one-way valve; 16. a second pressure sensor.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Example one

The embodiment discloses a fan, and specifically includes gear box and the main shaft that is connected with the gear box transmission, wherein the main shaft supports through the main shaft bearing that is located the inside of bearing housing. The transmission chain in the fan is in transmission connection with the main shaft through a gear box, three-point support is adopted, and a main shaft bearing is sleeved on the main shaft. In other embodiments, the gear box and the main shaft can also adopt four-point support, namely two main shaft bearings are sleeved on the main shaft.

At present, a main shaft bearing and a gear box are respectively provided with an independent lubricating system, so that the occupied space is large and the cost is high. Meanwhile, when the fan is in standby or power-off, the main shaft bearing and the gear box are difficult to synchronously control under the lubricating condition, and the risk of oil-free lubrication failure is easily caused.

In order to solve the above problem, as shown in fig. 1, the present embodiment further discloses a transmission lubrication system, which specifically includes an oil tank 1, a pump set 2, and an oil lock valve 3. The oil tank 1 is used for storing lubricating oil, and the pump unit 2 can inject the lubricating oil in the oil tank 1 into the bearing chamber 100 of the main shaft bearing and the gear box 200 through the oil supply pipeline 5 and return the lubricating oil to the oil tank 1 through the oil return pipeline 14. An oil lock valve 3 is arranged on the return line 14, which oil lock valve 3 is closed when the pump package 2 is de-energized, so that the lubricating oil remains in the bearing chamber 100 and in the gearbox 200.

When the gear box 200 and the main shaft adopt four-point support, in a transmission lubricating system, two bearing chambers 100 are connected with the gear box 200 in parallel, and an oil locking valve 3 and an oil return pipeline 14 are correspondingly added.

When the transmission lubricating system works, the pump set 2 injects lubricating oil in the oil tank 1 into the bearing chamber 100 of the main shaft bearing and the gear box 200 through the oil supply pipeline 5 respectively and flows back to the oil tank 1 through the oil return pipeline 14, so that the transmission lubricating system can lubricate the main shaft bearing and the gear box 200 respectively, the lubricating system of the main shaft bearing and the gear box 200 is integrated, the structure is simplified, the installation space of the transmission lubricating system is saved, and the synchronous control on the lubrication of the main shaft bearing and the gear box 200 is facilitated. When the pump group 2 is powered off, the oil locking valve 3 on the oil return pipeline 14 is closed, and the lubricating oil cannot flow back to the oil tank 1 through the oil return pipeline 14, so that the lubricating oil is kept in the bearing chamber 100 and the gear box 200, the risk of oil-free lubrication failure of the main shaft bearing and the gear box 200 in a power-off state is avoided, and the safety of the main shaft bearing and the gear box 200 is improved.

Note that, a case of the gear box 200 is used as the oil tank 1, and the bearing chamber 100 is communicated with the case of the gear box 200 through the oil return line 14.

The pump unit 2 of the present embodiment includes a motor and a gear pump, etc., and the motor drives the gear pump to rotate to provide a driving force for circulating the lubricating oil.

As shown in fig. 1, the transmission lubrication system further includes a filter 4, and the pump unit 2 and the filter 4 are sequentially disposed on the oil supply line 5 along the flowing direction of the lubricating oil in the oil supply line 5. The filter 4 filters the lubricating oil in the oil supply line 5. The oil supply line 5 includes a main line 51 and two branch lines 52, and one ends of the two branch lines 52 communicate with the bearing chamber 100 and the gear case 200, respectively. One end of the main conduit 51 communicates with the pump unit 2 and the filter 4 is provided at one end of the main conduit 51 adjacent to the branch conduit 52.

The filter 4 of this embodiment is a two-stage filter, which includes a coarse filter element and a fine filter element to improve the filtering effect. It should be noted that the filter 4 further includes a bypass valve and a differential pressure transmitter. When the lubricating oil only needs rough filtration to meet the filtration requirement, the bypass valve bypasses the fine filter element, and the lubricating oil enters the rough filter element through the bypass valve to be filtered. When the filter 4 works, if the fine filter element and/or the coarse filter element of the filter 4 is blocked, the pressure difference between the inlet and the outlet of the filter 4 is increased, and when the pressure difference reaches a certain value, the pressure difference signal transmitter generates a signal transmitting signal to remind a worker to clean or replace the filter element.

In the present embodiment the number of pump stacks 2 is selected according to the power level of the gearbox 200 and the flow rate of the lubricating oil. The number of pump stacks 2 is the same as the number of oil supply lines 5. When the power of the gear box 200 is large and the flow of the lubricating oil is large, a plurality of sets of oil supply pipelines 5 are arranged in parallel, and a plurality of pump sets 2 are arranged on the oil supply pipelines 5 in a one-to-one correspondence manner. The number of the pump groups 2 and the number of the oil supply lines 5 can be flexibly selected by those skilled in the art according to the working condition of the transmission lubrication system, and will not be described in detail herein.

It is to be noted that at the very beginning of the pump group 2, a certain amount of air is present both inside the oil supply line 5 and inside the filter 4. In order to discharge air, the transmission lubricating system further comprises an exhaust pipeline 12 and an exhaust valve 13, and both ends of the exhaust pipeline 12 are respectively communicated with the oil supply pipeline 5 and the gearbox 200. The exhaust valve 13 is provided in the exhaust line 12, and when the exhaust valve 13 is opened, the exhaust line 12 discharges the air in the main line 51 and the filter 4 into the gear box 200.

Specifically, the location where the exhaust line 12 communicates with the main line 51 is between the pump group 2 and the filter 4, so as to facilitate the rapid discharge of air inside the pump group 2 and inside the oil supply line 5.

In the working process of the transmission lubricating system, in order to avoid overlarge flow of lubricating oil in the main pipeline 51, the transmission lubricating system further comprises an overflow pipeline 8, a first pressure sensor 9 and an overflow valve 10, wherein two ends of the overflow pipeline 8 are respectively communicated with the main pipeline 51 and the oil tank 1. The first pressure sensor 9 is capable of collecting the pressure value of the lubricating oil in the main line 51. The overflow valve 10 is disposed on the overflow pipeline 8, and when the pressure value collected by the first pressure sensor 9 is greater than the second preset value, the overflow valve 10 is opened, so that the lubricating oil in the main pipeline 51 flows back to the oil tank 1 through the overflow pipeline 8.

The second preset value of this embodiment is 4bar, and of course, the size of the second preset value may also be flexibly adjusted according to the actual working condition of the transmission lubrication system, which is not specifically limited herein.

Further, the transmission lubrication system further comprises a pressure interface 11, and the pressure interface 11 is arranged on the overflow pipeline 8. When the first pressure sensor 9 fails or is maintained, an external pressure sensor can be mounted on the pressure interface 11 to replace the first pressure sensor 9 and measure the pressure value of the lubricating oil in the main pipeline 51 in real time, so that the pressure interface 11 forms a backup interface, and the reliability of the transmission lubricating system is improved.

After the lubricant oil is filtered by the filter 4, it is also necessary to determine whether the lubricant oil needs to be cooled before entering the bearing housing 100 and the gear box 200 according to whether the actual temperature of the lubricant oil meets the usage requirement. As shown in fig. 1, the transmission lubrication system further includes a cooler 6, the cooler 6 is disposed on one of the branch pipes 52, and the filter 4 and the thermostatic valve 7 are sequentially disposed on the main pipe 51 along the flowing direction of the lubricating oil in the main pipe 51.

The cooler 6 of the present embodiment may be an oil-water heat exchanger or an oil-air heat exchanger, and only needs to be able to cool the lubricating oil. It should be noted that a plurality of coolers 6 may be installed in parallel on the branch pipes 52 to improve the cooling effect on the lubricating oil.

When the temperature of the lubricating oil in the main pipe 51 is greater than a first preset value, the thermostat valve 7 communicates the main pipe 51 with the branch pipe 52 provided with the cooler 6 to cool the lubricating oil. When the temperature of the lubricating oil in the main pipeline 51 is less than or equal to a first preset value, the temperature control valve 7 communicates the main pipeline 51 with another branch pipeline 52, so that the lubricating oil can directly enter the bearing chamber 100 and the gearbox 200 without cooling.

The first preset value for this example is 45 deg.c. Of course, the first preset value can also be adaptively adjusted according to different lubrication requirements of the transmission lubrication system, and is not particularly limited herein.

It should be noted that the oil supply line 5 and the oil return line 14 are both flexibly connected to the bearing chamber 100 and the gear box 200 to reduce vibration during the operation of the transmission lubrication system, so as to protect the gear box 200 and the main shaft bearing, and to prolong the service life of the transmission lubrication system.

Specifically, the oil supply line 5 and the oil return line 14 are connected to the bearing chamber 100 and the gear box 200 through hoses such as metal hoses or rubber hoses, so as to realize a flexible connection structure. Furthermore, all parts of the transmission lubricating system are in a flexible connection mode, the damping effect of the transmission lubricating system is further improved, and the safety of the transmission lubricating system is improved.

As shown in fig. 1, the present embodiment further includes a second pressure sensor 16, and the oil inlets of the bearing chamber 100 and the gear box 200 are both installed on the second pressure sensor 16, so as to monitor the pressure values of the lubricating oil at the oil inlets of the bearing chamber 100 and the gear box 200 in real time.

In this embodiment, the transmission lubrication system further comprises a check valve 15, and the check valve 15 is installed between the pump unit 2 and the filter 4 and between the filter 4 and the thermo valve 7. The check valve 15 can prevent the lubricating oil from flowing backwards so as to protect the pump unit 2 and the filter 4 and keep the lubricating oil flowing in one direction in the transmission lubricating system all the time.

The fan of this embodiment lubricates the main shaft bearing in the gear box 200 and the bearing chamber 100 respectively through the above-mentioned transmission lubrication system, integrates the lubrication system of the main shaft bearing and the gear box 200, saves the installation space, and is convenient for simultaneously control the lubrication of the main shaft bearing and the gear box 200 synchronously. The oil locking valve 3 can enable lubricating oil to be reserved in the bearing chamber 100 and the gearbox 200, so that the risk of oil-free lubrication failure of the main shaft bearing and the gearbox 200 in a power-off state is avoided, and the safety of the fan is improved.

Example two

As shown in fig. 2, the present embodiment discloses a transmission lubrication system, which is substantially the same as that of the first embodiment, and the main differences are: the bearing chamber 100 and the gear box 200 are respectively communicated with the oil tank 1 through corresponding oil return pipelines 14, and the two oil return pipelines 14 are respectively provided with an oil locking valve 3. That is, the oil tank 1 is provided separately from the gear case 200 so that the oil tank 1 is a separate oil tank.

Since the interior of the bearing chamber 100 and the interior of the gear box 200 need to maintain different levels of lubricating oil, the number of the oil return lines 14 in the embodiment is two, the bearing chamber 100 is communicated with the oil tank 1 through one oil return line 14, and the gear box 200 is communicated with the oil tank 1 through the other oil return line 14.

The independent oil tank 1 needs to be provided with hydraulic accessories such as a heater and a liquid level meter. The heater can heat the lubricating oil in the oil tank 1 and raise the temperature, and the temperature of the lubricating oil is prevented from being too low. The liquid level meter can display the liquid level height of lubricating oil in the oil tank 1 in real time.

The gear box 200 of the present embodiment and the main shaft are supported by three points, i.e. the main shaft is sleeved with a main shaft bearing. In other embodiments, the gear box 200 and the main shaft may also be supported by four points, i.e. the main shaft is sleeved with two main shaft bearings. In the transmission lubrication system, two bearing chambers 100 are connected in parallel with the gear box 200, and an oil locking valve 3 and an oil return pipeline 14 are correspondingly added.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A transmission lubrication system, comprising:

an oil tank (1) for storing lubricating oil;

a pump group (2) configured to inject the lubricating oil in the oil tank (1) into a bearing chamber (100) of a main shaft bearing and into a gear box (200) through an oil supply line (5) and to return to the oil tank (1) through an oil return line (14); and

the oil locking valve (3) is arranged on the oil return pipeline (14); the oil lock valve (3) is closed when the pump group (2) is de-energized, so that the lubricating oil remains in the bearing chamber (100) and in the gearbox (200).

2. The transmission lubrication system according to claim 1, wherein the box of the gearbox (200) is the oil tank (1), and the bearing chamber (100) is in communication with the box of the gearbox (200) through the oil return line (14);

or the bearing chamber (100) and the gear box (200) are communicated with the oil tank (1) through the corresponding oil return pipelines (14), and the two oil return pipelines (14) are provided with the oil locking valve (3).

3. The transmission lubrication system of claim 1, further comprising:

the pump set (2) and the filter (4) are sequentially arranged on the oil supply pipeline (5) along the flowing direction of lubricating oil in the oil supply pipeline (5); the filter (4) is configured to filter the lubricating oil in the oil supply line (5).

4. The transmission lubrication system according to claim 3, wherein said oil supply line (5) comprises a main line (51) and two branch lines (52), one ends of said two branch lines (52) communicating with said bearing chamber (100) and said gearbox (200), respectively; one end of the main pipeline (51) is communicated with the pump set (2), and the filter (4) is arranged at one end of the main pipeline (51) close to the branch pipeline (52);

the transmission lubrication system further comprises:

a cooler (6) disposed on one of the branch pipes (52); and

the filter (4) and the temperature control valve (7) are sequentially arranged on the main pipeline (51) along the flowing direction of lubricating oil in the main pipeline (51);

when the temperature of lubricating oil in the main pipeline (51) is greater than a first preset value, the temperature control valve (7) communicates the main pipeline (51) with the branch pipeline (52) provided with the cooler (6); when the temperature of the lubricating oil in the main pipeline (51) is smaller than or equal to a first preset value, the temperature control valve (7) enables the main pipeline (51) to be communicated with the other branch pipeline (52).

5. The transmission lubrication system of claim 4, further comprising:

an overflow pipeline (8), the two ends of which are respectively communicated with the main pipeline (51) and the oil tank (1);

a first pressure sensor (9) configured to acquire a pressure value of the lubricating oil inside the main line (51); and

the overflow valve (10) is arranged on the overflow pipeline (8); the overflow valve (10) is configured to open when the pressure value collected by the first pressure sensor (9) is greater than a second preset value, so that the lubricating oil in the main pipeline (51) flows back to the oil tank (1) through the overflow pipeline (8).

6. The transmission lubrication system of claim 5, further comprising:

and the pressure interface (11) is arranged on the overflow pipeline (8).

7. The transmission lubrication system of claim 4, further comprising:

an exhaust pipeline (12) having both ends respectively communicated with the oil supply pipeline (5) and the gear box (200); and

an exhaust valve (13) disposed on the exhaust duct (12), the exhaust valve (13) being configured to discharge the air in the main duct (51) and the filter (4) into the gear box (200) through the exhaust duct (12) when opened.

8. The transmission lubrication system according to any one of claims 1 to 7, wherein both the oil supply line (5) and the oil return line (14) are flexibly connected to the bearing housing (100) and the gearbox (200).

9. The transmission lubrication system according to any one of claims 1 to 7, comprising a plurality of sets of the oil supply pipelines (5) arranged in parallel, wherein a plurality of the pump sets (2) are arranged on the oil supply pipelines (5) in a one-to-one correspondence.

10. A wind turbine comprising the transmission lubrication system according to any one of claims 1 to 9.