阅读说明：本技术 滚动轴承保护装置及其适用的垂直轴潮流能发电装置 (Rolling bearing protection device and vertical shaft tidal current energy power generation device applicable to same ) 是由 苗晓南 赵东福 吴振华 李嘉 丁祎程 李其朋 徐华军 何立君 钟华锋 陈超 胡冬 于 2020-06-19 设计创作，主要内容包括：本发明还提供一种滚动轴承保护装置及其适用的垂直轴潮流能发电装置,垂直轴潮流能发电装置包括框架、垂直轴水轮发电机、滚动轴承、滚动轴承保护装置。垂直轴水轮发电机包括垂直于水平面设置的主轴,主轴的一端可旋转地设置于框架的底部。滚动轴承套设于主轴的一端。滚动轴承保护装置设置于滚动轴承的上方。滚动轴承保护装置包括沿重力方向依次设置的第一道密封保护装置、第一漏水保护腔和第二道密封保护装置,第一道密封保护装置包括至少一个第一密封组件,第一漏水保护腔包括第一积水舱和第一排水孔,第一排水孔设置于第一积水舱的侧壁,第二道密封保护装置包括至少一个第二密封组件。(The invention also provides a rolling bearing protection device and a vertical shaft tidal current energy power generation device applicable to the rolling bearing protection device. The vertical shaft hydraulic generator comprises a main shaft arranged perpendicular to a horizontal plane, and one end of the main shaft is rotatably arranged at the bottom of the frame. The rolling bearing is sleeved at one end of the main shaft. The rolling bearing protection device is arranged above the rolling bearing. The rolling bearing protection device comprises a first sealing protection device, a first water leakage protection cavity and a second sealing protection device which are sequentially arranged along the gravity direction, the first sealing protection device comprises at least one first sealing component, the first water leakage protection cavity comprises a first ponding cabin and a first water drainage hole, the first water drainage hole is formed in the side wall of the first ponding cabin, and the second sealing protection device comprises at least one second sealing component.)

1. A rolling bearing protection device is suitable for a vertical shaft tidal current energy power generation device, the vertical shaft tidal current energy power generation device comprises a rolling bearing, and the rolling bearing protection device is arranged above the rolling bearing, and the rolling bearing protection device is characterized by comprising:

the first way of sealed protection device, the first protection chamber of leaking and the sealed protection device of second that set gradually along the direction of gravity, first way sealed protection device includes at least one first seal assembly, first protection chamber of leaking includes first ponding cabin and first drainage hole, first drainage hole sets up in the lateral wall in first ponding cabin, the sealed protection device of second includes at least one second seal assembly.

2. The rolling bearing protection device according to claim 1, wherein the second seal protection device comprises a second water leakage protection chamber, the second water leakage protection chamber comprises a second water collecting chamber and a second water drainage hole, and the second water drainage hole is formed in a side wall of the second water collecting chamber.

3. The rolling bearing protection device of claim 2, wherein the second seal protection device comprises a stop structure disposed above the second sump compartment to stop the sump water from spilling out of the second sump compartment.

4. A vertical axis tidal current energy power generation device is characterized by comprising:

a frame;

the vertical shaft hydraulic generator comprises a main shaft arranged vertical to a horizontal plane, and one end of the main shaft is rotatably arranged at the bottom of the frame;

the rolling bearing is sleeved at one end of the main shaft;

a rolling bearing protection device according to any one of claims 1 to 3 provided above the rolling bearing.

5. The vertical axis tidal current energy power generation device according to claim 4, further comprising a bearing oil supply pipe penetrating the inside of the main shaft, wherein one end of the bearing oil supply pipe is communicated with the lubrication cavity of the rolling bearing to supply lubricating oil into the lubrication cavity.

6. The vertical axis tidal current energy power generation device according to claim 4, further comprising an oil pumping pipe and an oil pump, wherein the oil pumping pipe and the oil pump are arranged in the main shaft in a penetrating manner, one end of the oil pumping pipe is communicated with the lubricating cavity of the rolling bearing, and the oil pump is arranged at the other end of the oil pumping pipe to pump lubricating oil in the lubricating cavity away through the oil pumping pipe.

7. The vertical axis tidal current energy power generation device according to claim 4, further comprising a liquid level sensor, a water suction pipe and a water suction pump, wherein the first drainage hole is communicated with the inside of the main shaft, the liquid level sensor detects the water level of the water leakage accumulated inside the main shaft, and when the liquid level sensor detects that the water level inside the main shaft reaches a preset value, the water suction pump operates to pump the accumulated water inside the main shaft through the water suction pipe and drain the accumulated water outside the vertical axis tidal current energy power generation device.

8. The vertical axis tidal power generation device of claim 4, wherein the main shaft is a hollow structure and has a large enough inner diameter to allow service personnel to access the interior of the main shaft.

9. The vertical axis tidal power generation apparatus of claim 8, further comprising at least one blower and a ventilation pipe disposed in the main shaft, the ventilation pipe passing from above the water surface to below the water surface to enable ventilation in the main shaft.

10. The vertical axis tidal power generation device of claim 4, wherein the other end of the main shaft is rotatably fixed to the top of the frame by another rolling bearing.

Technical Field

The invention belongs to the field of tidal current energy power generation, and particularly relates to a rolling bearing protection device and a vertical shaft tidal current energy power generation device applicable to the same.

Background

Ocean energy (including tidal current energy, wave energy, temperature difference energy, salt difference energy, ocean current energy and the like) is clean and pollution-free renewable energy, is rich in reserves and wide in distribution, and has excellent development prospect and value. Nowadays, the shortage of energy sources is increasing, the greenhouse effect is increasing, and the energy sources need low carbonization, so clean energy sources such as wind energy, ocean energy and the like are the development directions of future energy sources. However, in addition to the mature wind energy utilization, the ocean energy utilization is still in the starting stage, and the current power generation equipment of clean energy is lack of universal and mature equipment. Most importantly, the power generation cost of the tidal current energy power generation device is far higher than that of other energy sources, and the commercial application and popularization of tidal current energy power generation are seriously hindered.

The tidal current energy power generation device mainly adopts two types of hydraulic generators, one type is a vertical shaft hydraulic generator, and the other type is a horizontal shaft hydraulic generator. Since the main shaft of a vertical axis water turbine is always rotated, a bearing is generally used to support the main shaft. Bearings are generally classified into two types according to the difference in frictional properties: sliding bearings and rolling bearings. A plain bearing is a bearing that operates under sliding friction. Under liquid lubrication conditions, the sliding surfaces are separated by the lubricant (i.e., clear water) without direct contact, greatly reducing surface wear. The sliding bearing has a large starting frictional resistance because the entire surface is rubbed. The sliding bearing is large in friction resistance, easy to damage and short in service life, and the longest service life of the sliding bearing in practical use is less than five years, so that if the tidal current energy power generation device uses the sliding bearing, the whole power generation device needs to be lifted out of the water surface for replacing the bearing within five years. The use and maintenance costs of plain bearings are therefore very high.

A rolling bearing is a bearing in which sliding friction between a shaft and a shaft seat in operation is changed into rolling friction, thereby reducing friction loss. The rolling bearing can be used for 20-30 years at the maximum if properly maintained, and the manufacturing cost of the rolling bearing itself is lower than that of the sliding bearing. Therefore, the use and maintenance cost of the tidal current energy power generation device can be greatly reduced by adopting the rolling bearing. However, unlike the sliding bearing, the rolling bearing uses lubricating oil as a lubricant. As most tidal current energy power generation devices operate in water, the sealing performance requirement of the rolling bearing is very high, and once external seawater leaks into the rolling bearing from the sealing ring, the whole rolling bearing is completely scrapped. This not only can not play the effect of reduce cost, has improved the use of bearing and cost of maintenance on the contrary. However, none of the conventional vertical axis tidal current energy power generation devices can solve the problem of sealing performance of the rolling bearing after long-term use. Because of this, even if the rolling bearing is more suitable for the tidal current energy power generation device, the conventional vertical axis tidal current energy power generation device still employs the sliding bearing.

Disclosure of Invention

The invention provides a rolling bearing protection device and a vertical shaft tidal current energy power generation device suitable for the same, aiming at overcoming at least one defect in the prior art.

In a first aspect, the present invention provides a rolling bearing protection device, which is suitable for a vertical axis tidal current energy power generation device, wherein the vertical axis tidal current energy power generation device comprises a rolling bearing, and the rolling bearing protection device is arranged above the rolling bearing. The rolling bearing protection device comprises a first sealing protection device, a first water leakage protection cavity and a second sealing protection device which are sequentially arranged along the gravity direction, the first sealing protection device comprises at least one first sealing component, the first water leakage protection cavity comprises a first ponding cabin and a first water drainage hole, the first water drainage hole is formed in the side wall of the first ponding cabin, and the second sealing protection device comprises at least one second sealing component.

In an embodiment of the first aspect of the present invention, the second sealing protection device includes a second water leakage protection cavity, the second water leakage protection cavity includes a second water collecting chamber and a second water drainage hole, and the second water drainage hole is disposed on a side wall of the second water collecting chamber.

In an embodiment of the first aspect of the present invention, the second sealing protection device includes a stopping structure, and the stopping structure is disposed above the second water collecting tank to stop the accumulated water in the second water collecting tank from splashing out.

In a second aspect, the invention further provides a vertical axis tidal current energy power generation device, which comprises a frame, a vertical axis hydraulic generator, a rolling bearing and a rolling bearing protection device. The vertical shaft hydraulic generator comprises a main shaft arranged perpendicular to a horizontal plane, and one end of the main shaft is rotatably arranged at the bottom of the frame. The rolling bearing is sleeved at one end of the main shaft. The rolling bearing protection device is arranged above the rolling bearing. The rolling bearing protection device comprises a first sealing protection device, a first water leakage protection cavity and a second sealing protection device which are sequentially arranged along the gravity direction, the first sealing protection device comprises at least one first sealing component, the first water leakage protection cavity comprises a first ponding cabin and a first water drainage hole, the first water drainage hole is formed in the side wall of the first ponding cabin, and the second sealing protection device comprises at least one second sealing component.

In an embodiment of the second aspect of the present invention, the second sealing protection device includes a second water leakage protection cavity, the second water leakage protection cavity includes a second water collecting chamber and a second water drainage hole, and the second water drainage hole is disposed on a side wall of the second water collecting chamber.

In an embodiment of the second aspect of the present invention, the second sealing protection device includes a stopping structure, and the stopping structure is disposed above the second water collecting chamber to stop the accumulated water in the second water collecting chamber from splashing out.

In an embodiment of the second aspect of the present invention, the vertical axis tidal current energy power generation device further includes a bearing oil supply pipe penetrating the interior of the main shaft, and one end of the bearing oil supply pipe is communicated with the lubrication cavity of the rolling bearing to provide lubricating oil to the lubrication cavity.

In an embodiment of the second aspect of the present invention, the vertical axis tidal current energy power generation device further includes an oil pumping pipe and an oil pump, the oil pumping pipe is disposed inside the main shaft, one end of the oil pumping pipe is communicated with the lubrication cavity of the rolling bearing, and the oil pump is disposed at the other end of the oil pumping pipe to pump away the lubricating oil in the lubrication cavity through the oil pumping pipe.

In an embodiment of the second aspect of the present invention, the vertical axis tidal current energy power generation device further includes a liquid level sensor, a water pumping pipe, and a water pumping pump, the first water drainage hole is communicated with the inside of the main shaft, the liquid level sensor detects a water level of water leaking accumulated inside the main shaft, and when the liquid level sensor detects that the water level inside the main shaft reaches a preset value, the water pumping pump operates to pump the accumulated water inside the main shaft through the water pumping pipe and drain the accumulated water outside the vertical axis tidal current energy power generation device.

In one embodiment of the second aspect of the present invention, the main shaft is a hollow structure and has a sufficiently large inner diameter to allow service personnel to access the interior of the main shaft.

In an embodiment of the second aspect of the present invention, the vertical axis tidal current energy power generation device further comprises at least one blower and a ventilation pipe, the ventilation pipe is arranged in the main shaft, and the ventilation pipe passes from above the water surface to below the water surface so as to enable ventilation in the main shaft.

In an embodiment of the second aspect of the present invention, the other end of the main shaft is rotatably fixed to the top of the frame by another rolling bearing.

In summary, in the rolling bearing protection device provided by the invention, the water leakage protection cavity is arranged between the two sealing protection devices, and even if the sealing element is aged and loosened after being used for a long time, water leakage can be collected and accumulated by the first water leakage protection cavity and cannot enter the rolling bearing. A second sealing protection device is arranged below the first water leakage protection cavity, so that sealing safety redundancy is formed, and all possibility that water leaks into the rolling bearing is eliminated. The service environment of the rolling bearing is ensured, and the service life of the rolling bearing is greatly prolonged. Therefore, the cost of the vertical shaft tidal current energy power generation device is reduced, and the commercial application of the vertical shaft tidal current energy power generation device is promoted.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic view of a vertical axis tidal current energy power generation device according to an embodiment of the present invention.

Fig. 2 is an enlarged schematic view of the circle marked a in fig. 1.

Fig. 3 is an enlarged schematic view of the circle marked B in fig. 2.

Detailed Description

As shown in fig. 1 to 3, a vertical axis tidal current energy power generation device according to an embodiment of the present invention includes a frame 1, a vertical axis hydro-generator 2, a rolling bearing 3, and a rolling bearing protection device 4.

The vertical axis hydro-generator 2 includes a main shaft 21 disposed perpendicular to the horizontal plane P, and one end of the main shaft 21 is rotatably fixed to the bottom 11 of the frame 1. In the present embodiment, the end of the main shaft 21 is the bottom end shown in fig. 1. The water turbine part of the vertical shaft hydraulic generator is positioned below the water surface, and the generator part is positioned above the water surface. The invention does not limit the concrete type of the vertical shaft water wheel generator. The hydraulic turbine of this application can adopt lift type impeller also can adopt resistance type impeller.

The rolling bearing 3 is fitted over the end (i.e., the bottom end) of the main shaft 21. In the present embodiment, the rolling bearing 3 has a lubrication chamber 31 filled with lubricating oil. The vertical shaft tidal current energy power generation device adopts the rolling bearing instead of the sliding bearing, the friction coefficient of the bearing is lower, the bearing capacity is higher, and the problems of high friction and low bearing capacity caused by the sliding bearing used in the traditional vertical shaft tidal current energy power generation device are solved.

In the present embodiment, the other end of the main shaft 21 is rotatably fixed to the top of the frame 1 by another rolling bearing 3. Specifically, the vertical axis tidal current energy power generation device has two rolling bearings 3, which are respectively sleeved at two positions of the main shaft 21, namely, at the bottom end and near the top end of the main shaft 21 (the two rolling bearings 3 are respectively fixed at the top and bottom of the frame 1). By this arrangement, both ends of the main shaft 21 can be "restrained", thereby improving the resistance of the main shaft 21 to water flow impact. The existing vertical shaft tidal current energy power generation device is only provided with a rolling bearing at the part of a main shaft close to the top end for constraint, and the rolling bearing is abandoned for constraint due to the high cost of replacing lubricating oil at the bottom end of the main shaft. Therefore, the tidal current energy power generation device cannot be deeply manufactured in the water depth direction (once the tidal current energy power generation device is deeply manufactured in the prior art, the bottom of the main shaft is not restrained, so that the tidal current energy power generation device cannot resist the huge impact force of water flow, and the main shaft is easy to bend or even break from the main shaft), so that the power generation power of the vertical shaft tidal current energy power generation device is greatly limited. The vertical axis tidal current energy power generation device of the embodiment effectively overcomes the problem in the prior art, realizes the application of the long main shaft through two-point constraint, and realizes the full utilization of tidal current energy in the water depth direction.

If the vertical axis tidal current energy power generation device adopts three or more than three constraint points, although the main shaft can be better supported at a plurality of positions, in order to match the sizes of the main shaft and the bearing, the requirement on the machining precision of the main shaft is very high, and the cost is increased. The vertical axis tidal current energy power generation device of the embodiment restrains two ends of the main shaft, and the requirement on machining precision can be effectively lowered. Therefore, the spindle can be well supported, and the cost can be effectively controlled.

The rolling bearing protection device 4 is provided above the rolling bearing 3. In the present embodiment, the rolling bearing protection device 4 surrounds the gap between the rolling bearing 3 and the main shaft 21 to protect the rolling bearing 3 from seawater intrusion from the outside. References to "upper" and "lower" in this application are with respect to the direction of gravity. The direction of gravity referred to in this application is the direction of gravity from the top to the bottom as viewed from the perspective shown in fig. 1. The rolling bearing protection device 4 comprises a first sealing protection device 41, a first water leakage protection cavity 43 and a second sealing protection device 42 which are arranged in sequence along the gravity direction.

First seal protection device 41 includes at least one first seal assembly 411. In the present embodiment, the first sealing assembly 411 is formed by a plurality of different types of sealing members, and the sealing performance is ensured by forming safety redundancy by using the different types of sealing members. Specifically, the first sealing assembly 411 includes at least two sealing rings 4111 at the top to block the sand in the external water flow. The sealing ring 4111 may be made of a carbon-based composite material, however, the material of the sealing ring is not limited in any way. The first seal assembly 411 further includes a spring 4112 for applying pressure to the seal ring 4111 to make the two seal rings 4111 tightly fit. Below seal ring 4111 and spring 4112, first seal assembly 411 may further include a seal gasket 4113. The present invention is not limited in any way to the specific configuration of the first seal assembly. In other embodiments, the first sealing assembly may have no spring but only a plurality of sealing rings, or the first sealing assembly may adopt any one of a hermetic seal, a metal seal, and the like. In another embodiment, the first sealing assembly may further include a sump and drain hole as described below. In yet another embodiment, the first seal protector 41 may include two or more first seal assemblies 411.

The first water leakage protection chamber 43 includes a first sump 431 and a first drain hole 432, and the first drain hole 432 is provided to a side wall of the first sump 431. In this embodiment, when the first sealing protector 41 is aged and loosened due to long-term use, a small amount of seawater may leak from a gap between the first sealing protector 41 and the main shaft 21, and the first water collecting chamber 431 is disposed below the first sealing protector 41 to collect and store the seawater leaking from the first sealing protector 41, thereby preventing the seawater from invading the interior of the rolling bearing 3. When the level of the accumulated leakage water reaches the first drainage hole 432, the accumulated leakage water will flow to the inside of the main shaft 21 through the first drainage hole 432 since the first drainage hole 432 communicates the first water collecting chamber 431 and the inside of the main shaft 21.

The second seal protector 42 includes at least one second seal assembly 421. The present invention is not limited in any way to the specific configuration of the second seal assembly. The second sealing component can be any sealing form such as a sealing ring, a sealing gasket, an air seal and a metal seal. In another embodiment, the second seal protector may include two or more second seal assemblies. In this embodiment, the second sealing protection device 42 includes a second water leakage protection cavity 422, the second water leakage protection cavity 422 includes a second water storage compartment 4221 and a second water drainage hole 4222, and the second water drainage hole 4222 is disposed on a side wall of the second water storage compartment 4221. Preferably, the second drain hole 4222 is located on the side wall of the second water storage compartment 4221 near the bottom, so that water leakage accumulated in the second water storage compartment 4221 can be drained in time. After the vertical axis tidal current energy power generation device operates for several years, the amount of the leaked water stored in the first water collecting tank 431 is large, and the leaked water may not be timely discharged from the first water discharge hole 432 to the inside of the main shaft 21, and at this time, if the second sealing protection device 42 is not provided, the seawater may still flow into the lower rolling bearing 3. In order to ensure that seawater does not invade the interior of the rolling bearing 3, the invention is provided with a second sealing protection device 42 below the first water leakage protection cavity 43, thereby further ensuring the service environment of the rolling bearing and prolonging the service life of the rolling bearing.

When the amount of the leakage water stored in the second leakage protection chamber 422 is large, the main shaft 21 is always rotated, and the stored leakage water may be splashed by a centrifugal force. In this embodiment, the second sealing protection device 42 includes a stopping structure 423, and the stopping structure 423 is disposed above the second water storage compartment 4221 to stop the water stored in the second water storage compartment 4221 from splashing out. In this embodiment, the side wall and the top of the second water leakage protection cavity 422 are provided with protruding portions, i.e. a stop structure is formed.

Due to the corrosivity of seawater and the huge impact force of water flow, the service life of a sealing element of the vertical shaft tidal current energy power generation device is usually not more than 5 years. In practical applications, in less than five years, in order to ensure that the rolling bearing is not invaded by seawater, the conventional vertical shaft tidal current energy power generation device needs to lift the whole generator set out of the water surface to replace a sealing piece, so that the cost of tidal current energy power generation is high. According to the invention, the first water leakage protection cavity is arranged below the first sealing protection device, and the second sealing protection device is arranged below the first water leakage protection cavity, so that external seawater can not flow into the rolling bearing, the service life of the rolling bearing is effectively prolonged, the maintenance or replacement frequency of the bearing is greatly reduced, and the maintenance cost of the vertical shaft tidal current energy power generation device is greatly reduced.

In this embodiment, the vertical axis tidal current energy power generation device further includes an oil pumping pipe 5 and an oil pump 6. The oil pumping pipe 5 is arranged in the main shaft 21 in a penetrating way, and one end of the oil pumping pipe 5 is communicated with the lubricating cavity 31 of the rolling bearing 3. The oil pump 6 is communicated with the other end of the oil pumping pipe 5 to pump the lubricating oil in the lubricating cavity 31 through the oil pumping pipe 5. In the present embodiment, the oil pump 6 is disposed inside the main shaft 21. However, the present invention is not limited thereto. In other embodiments, the pump may be located on the surface of the water outside the main shaft.

In this embodiment, the vertical axis tidal current energy power generation device further comprises a bearing oil supply pipe 7. The bearing oil supply pipe 7 is inserted into the main shaft 21, and one end of the bearing oil supply pipe 7 communicates with the lubrication chamber 31 of the rolling bearing 3 to supply lubricating oil into the lubrication chamber 31. In actual use, the other end of the bearing oil supply pipe 7 may communicate with an oil storage tank 71 storing fresh lubricating oil. In this embodiment, the oil storage chamber may be disposed in the main shaft 21. However, the present invention is not limited to this, and in other embodiments, the oil storage chamber may be disposed on the water surface outside the main shaft 21.

The lubricant of the rolling bearing is a lubricating oil. When the lubricating oil works normally, the lubricating oil can prevent friction between parts, reduce heat generation, absorb some silt and the like, and keep the machine running well. However, the lubricating oil is available and cannot be used for a long time, and must be replaced within a certain time, so that the service life of the whole shafting is prolonged. Especially, after the rolling bearing is used for a period of time, lubricating oil can deteriorate due to factors such as high temperature, impurity pollution and the like, the phenomena of color change, multiple foams and even emulsification are presented, and the lubricating effect is greatly reduced. In order to ensure the lubrication quality of the rolling bearing, the lubricating oil must be replaced regularly (generally not more than six months). If the lubricating oil is not replaced in time, the wear of parts is accelerated due to the fact that the lubricating effect cannot be achieved, the service life is influenced, and due to the fact that the lubricating effect cannot be achieved well, resistance is formed on the rotation of the main shaft, the rotation of the whole water turbine is influenced, and therefore the power generation power is influenced.

Due to the complex environment in the ocean, the conventional vertical axis tidal current energy power generation device cannot realize the underwater lubricant oil replacement. When lubricating oil is required to be checked and replaced, the traditional vertical shaft tidal current energy power generation device firstly has to stop the operation of the water turbine, then lifts the whole water turbine from water to a position above the water surface, and then removes the bearing, so that the lubricating oil can be replaced, and the bearing is repaired and maintained. Therefore, the maintenance and repair work of the bearing of the traditional vertical shaft tidal current energy power generation device is time-consuming and labor-consuming, and the maintenance cost is high.

According to the vertical shaft tidal current energy power generation device provided by the invention, when the lubricating oil needs to be replaced, the oil pump 6 is controlled to work, and the deteriorated lubricating oil in the lubricating cavity 31 is extracted. The lubricating oil that has not been deteriorated flows into the lubrication chamber 31 through the bearing oil supply pipe 7 by gravity. The replacement of the lubricating oil under the water surface is realized by removing the 'old' oil and replacing the 'new' oil. Therefore, the vertical shaft tidal current energy power generation device provided by the invention can realize the replacement of the lubricating oil without lifting the water turbine above the water surface, and greatly reduces the operation cost of the vertical shaft tidal current energy power generation device.

In particular, the present embodiment facilitates inspection, maintenance and replacement of the bearing oil supply pipe 7 and the oil pumping pipe 5 while protecting the pipes from external seawater impact and corrosion by disposing the bearing oil supply pipe 7 and the oil pumping pipe 5 inside the main shaft 21.

In this embodiment, the vertical axis tidal current energy power generation device further includes a liquid level sensor 81, a water pumping pipe 82 and a water pumping pump 83. When the leakage water enters the inside of the main shaft 21 from the first drainage hole and accumulates at the bottom of the main shaft 21, the liquid level sensor 81 detects the water level inside the main shaft 21, and when the liquid level sensor 81 detects that the water level inside the main shaft 21 reaches a preset value, the water suction pump 83 operates to suck the water inside the main shaft 21 to the outside of the vertical axis tidal current energy power generation device through the water suction pipe 82.

The present embodiment is provided with a liquid level sensor 81, a water suction pipe 82 and a water suction pump 83. In this embodiment, the first drain hole 432 and the second drain hole 4222 communicate with the inside of the main shaft 21, and drain the water leaked from the first water collecting chamber 431 and the second water collecting chamber 4221 to the inside of the main shaft 21. The leakage water is accumulated at the bottom of the main shaft 21 by gravity. The liquid level sensor 81 detects the water level of the water leakage accumulated inside the main shaft 21, and when the liquid level sensor 81 detects that the water level inside the main shaft 21 reaches a preset value, the water suction pump 83 operates to pump the accumulated water inside the main shaft 21 through the water suction pipe 82 and discharge the accumulated water outside the vertical axis tidal current energy power generation device.

In the present embodiment, the main shaft 21 has a hollow structure and has a sufficiently large inner diameter to allow a serviceman to enter the inside of the main shaft 21. Specifically, a portion of the main shaft 21 located above the horizontal plane P has an opening, and a maintenance worker or a maintenance device can enter the main shaft 21 through the opening to inspect, maintain, or repair a pipe, a component, or the like provided in the main shaft 21. The present invention is not limited to any particular inner diameter of the main shaft 21. If the maintenance operation is performed by a human, the inner diameter of the main shaft 21 should be wide enough to allow an adult to pass through, and may be 1.5m or more, for example. Correspondingly, the inner wall of the main shaft 21 can be provided with a ladder stand, so that maintenance personnel can conveniently enter the bottom of the main shaft 21 to overhaul the rolling bearing 3, maintain or replace pipelines such as an oil pumping pipe or a water pumping pipe and the like, and maintain or replace an oil well pump or a water pumping pump and the like. If a robot or robotic apparatus is being serviced, the inner diameter width of the outer shaft need only be passed by the servicing machine.

In this embodiment, the vertical axis tidal current energy power generation device further comprises at least one ventilation pipe 91 and a blower 92, the ventilation pipe 91 is arranged in the main shaft 21, and the ventilation pipe 91 is communicated from above the water surface to below the water surface so as to enable ventilation in the main shaft 21. The conventional vertical shaft tidal current energy power generation device does not consider the situation of underwater installation or maintenance. The inventor previously considered the underwater maintenance, but neglected the problem that the high temperature generated by the heat of the machine is accompanied by the generation of toxic and harmful gases and the excessive concentration of carbon dioxide because the internal machine is operated for a long time. If underwater operation is needed, personnel need to stay underwater for a long time, and oxygen deficiency or carbon dioxide poisoning and other conditions are easy to occur. The air blower and the ventilation pipe of the embodiment form a fresh air system, and the life safety of maintenance personnel or installation personnel entering underwater is greatly guaranteed. When personnel need to enter the working area below the water surface to work, the blower can be started to change air in the working area below the water surface. In specific applications, the fresh air system may have a more complex structure, such as an independent air supply system and an independent air exhaust system, which are not described herein again.

In summary, in the rolling bearing protection device provided by the invention, the water leakage protection cavity is arranged between the two sealing protection devices, and even if the sealing element is aged and loosened after being used for a long time, water leakage can be accumulated in the first water leakage protection cavity and cannot enter the rolling bearing. A second sealing protection device is arranged below the first water leakage protection cavity, so that safety redundancy is formed, and the possibility that all water leakage enters the interior of the rolling bearing is eliminated. The service environment of the rolling bearing is ensured, and the service life of the rolling bearing is greatly prolonged. Therefore, the cost of the vertical shaft tidal current energy power generation device is reduced, and the commercial application of the vertical shaft tidal current energy power generation device is promoted. The vertical shaft tidal current energy power generation device adopts the rolling bearing instead of the sliding bearing, the friction coefficient of the bearing is lower, the bearing capacity is higher, the problems of high friction and low bearing capacity caused by the sliding bearing used in the traditional vertical shaft tidal current energy power generation device are solved, and the use cost and the maintenance cost are greatly reduced.

In addition, the bearing oil supply pipe and the oil pumping pipe of the embodiment are arranged inside the main shaft, so that the pipeline is protected from being impacted and corroded by external seawater, meanwhile, the bearing oil supply pipe and the oil pumping pipe are favorably checked, maintained and replaced, the structure is simpler, and the wiring is more reasonable. According to the embodiment, the rolling bearings are arranged at the bottom and the top of the main shaft, so that two ends of the main shaft can be restrained, and the main shaft can effectively resist impact of water flow. Therefore, the main shaft can be lengthened, ocean energy is fully utilized as far as possible, and the power generation power is increased. The vertical axis tidal current energy power generation device provided by the embodiment controls the oil pump to work and extracts deteriorated lubricating oil in the lubricating cavity when the lubricating oil needs to be replaced. The lubricating oil which is not deteriorated flows into the lubricating cavity through the bearing oil supply pipe under the action of gravity, so that the lubricating oil under the water surface is replaced. Therefore, the vertical axis tidal current energy power generation device provided by the embodiment can realize the replacement of the lubricating oil without lifting the water turbine above the water surface, the maintenance of the rolling bearing is simpler, and the maintenance cost is greatly reduced.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.