CN221824306U - Main bearing oil lubrication sealing structure of wind generating set - Google Patents

Abstract

The utility model discloses a main bearing oil lubrication sealing structure of a wind generating set, wherein an oil blocking piece is arranged in a bearing seat, so that the depth of an oil storage cavity is deepened under the action of a certain inclination angle of the wind generating set, the storage quantity of lubricating oil is increased, and the front end of a main bearing is lubricated by an oil bath. When the liquid level in the oil storage cavity is too high, overflowed lubricating oil can flow back to the oil tank of the gear box, an external circulation loop can be formed under the normal running state of the unit, and the main bearing and the gear box uniformly use gear oil to conduct oil lubrication, so that the lubricating oil in the oil storage cavity does not need to be independently replaced, the operation and maintenance time is saved, and the operation and maintenance cost is reduced. The labyrinth sealing structure formed by the retainer ring and the end cover can effectively improve the liquid level and prevent the lubricating oil from flowing out. The first clamp plate and packing cooperation can effectively block the seepage of lubricating oil. Under the cooperation of first clamp plate and second clamp plate, V type sealing member can effectively block outside air, rainwater, dust and enter into the bearing frame inside, avoids causing the influence to the quality of lubricating oil.

Description

A wind turbine generator set main bearing oil lubrication sealing structure

Technical Field

The utility model relates to the technical field of oil lubrication seals, in particular to an oil lubrication seal structure for a main bearing of a wind generator set.

Background Art

With the rapid development of wind turbines, the main shaft assembly system, which consists of bearing seats, main shafts, main bearings, front end covers, etc., is mainly lubricated by regular injection of grease. This form of lubrication consumes a large amount of grease, and manual grease injection and cleaning are required during unit maintenance, which is time-consuming and labor-intensive.

In addition, the unit has its own elevation angle, which causes a difference in liquid level between the front and rear ends of the main bearing and the gearbox. The oil bath lubrication and sealing of the front end of the main bearing have become new challenges. It is necessary to meet the lubrication conditions of the main bearing and ensure that the lubricating oil does not leak from the front end seal.

Furthermore, the oil storage cavity at the bottom of the main bearing is a static cavity, and impurities are easily deposited at the bottom of the oil storage cavity, which has a greater impact on the main bearing rollers and will reduce the service life of the main bearing.

Summary of the invention

The utility model aims to overcome the deficiencies of the prior art and provide an oil lubrication sealing structure for the main bearing of a wind turbine generator set.

In order to achieve the above purpose, the technical solution provided by the utility model is:

A main bearing oil lubrication sealing structure of a wind turbine generator set, comprising a retaining ring, an end cover, a main shaft, a main bearing, a bearing seat and a gear box;

The main shaft is mounted on the bearing seat through the main bearing;

The retaining ring and the end cover are both installed on the main shaft;

An oil retaining member is provided in the bearing seat;

The retaining ring, end cover, main shaft, main bearing, bearing seat and oil retaining member cooperate to form an oil storage cavity;

The oil storage cavity is communicated with the oil tank of the gear box.

In this technical solution, an oil baffle is provided in the bearing seat. Under the action of a certain inclination angle of the unit, the depth of the oil storage cavity is deepened and the amount of lubricating oil is increased, so that the front end of the main bearing can be lubricated by oil bath. In conjunction with the oil injection system on the top of the bearing seat and the front end cover, the lubrication of the main bearing meets the design requirements.

The oil storage chamber is connected to the oil tank of the gearbox. When the liquid level in the oil storage chamber is too high, the overflowing lubricating oil will flow back to the oil tank of the gearbox. Under normal operation of the unit, an external circulation loop can be formed. The main bearing and the gearbox use gear oil for oil lubrication. There is no need to replace the lubricating oil in the oil storage chamber separately, which saves operation and maintenance time and reduces operation and maintenance costs.

Furthermore, the end cap is arranged outside the retaining ring and cooperates with the retaining ring in a non-contact manner to form a labyrinth sealing structure. The sealing mechanism is that the fluid generates resistance through the labyrinth and reduces its flow rate, which is called the "labyrinth effect". For liquids, there are fluid mechanics effects, including hydraulic friction effect and flow contraction effect; for gases, there are also thermodynamic effects, that is, the heat conversion generated by the gas in the labyrinth due to compression or expansion; in addition, there is also the "breathing effect" and so on.

Furthermore, the front end of the end cover is provided with a first pressing plate detachably connected thereto;

Packing is provided at the outlet of the labyrinth seal structure;

The first pressing plate limits and fixes the packing, and the first pressing plate cooperates with the packing to effectively block the lubricating oil passing through the labyrinth sealing structure.

Furthermore, a waterproof and dustproof component is provided on the periphery of the labyrinth sealing structure outlet.

Further, the waterproof and dustproof assembly includes an elastic V-shaped seal and a second pressure plate;

The second pressing plate is arranged in front of the first pressing plate;

The V-shaped sealing member is in contact with the first pressing plate under the action of the second pressing plate, thereby sealing the periphery of the outlet of the labyrinth sealing structure.

The V-shaped seal, in cooperation with the first pressure plate and the second pressure plate, can block outside air, rain, sand and dust from entering the oil storage cavity, reduce the pollution of the lubricating oil, reduce the risk of damage to the main bearing, and increase the service life of the main bearing.

Furthermore, the main bearing is located in the middle of the oil storage cavity, dividing the oil storage cavity into a first oil storage sub-cavity and a second oil storage sub-cavity;

The bottom of the first oil storage sub-cavity and the bottom of the second oil storage sub-cavity are connected through an internal circulation pipe to form an internal circulation loop, so that the precipitated impurities will not stay at the bottom of the first oil storage sub-cavity and the bottom of the second oil storage sub-cavity, and with the cooperation of the external circulation loop and the internal circulation loop, the flowing lubricating oil will bring out the impurities in the oil storage cavity, reduce the impact of impurities on the main bearing rollers, and increase the service life.

Furthermore, a first oil return pipeline is provided in the end cover;

A second oil return pipeline is provided in the bearing seat;

One end of the first oil return pipeline is connected to the oil storage cavity, and the other end is connected to one end of the second oil return pipeline;

The other end of the second oil return pipeline is communicated with the oil tank of the gear box.

Furthermore, a first sealing ring is provided at the connecting point between the first oil return pipeline and the second oil return pipeline to prevent leakage at the connecting point.

Furthermore, an oil return channel is provided between the top end of the oil baffle and the main shaft, and the oil return channel is communicated with the oil tank of the gear box.

Furthermore, a second sealing ring is provided between the end cover and the bearing seat to improve the sealing performance.

Compared with the prior art, the principles and advantages of this technical solution are as follows:

1. An oil baffle is installed in the bearing seat. Under the action of a certain inclination angle of the unit, the depth of the oil storage cavity is deepened, the amount of lubricating oil is increased, and the front end of the main bearing is lubricated by oil bath. In conjunction with the oil injection system on the top of the bearing seat and the front cover, the lubrication of the main bearing meets the design requirements.

The oil storage chamber is connected to the oil tank of the gearbox. When the liquid level in the oil storage chamber is too high, the overflowing lubricating oil will flow back to the oil tank of the gearbox. Under normal operation of the unit, an external circulation loop can be formed. The main bearing and the gearbox use gear oil for oil lubrication. There is no need to replace the lubricating oil in the oil storage chamber separately, which saves operation and maintenance time and reduces operation and maintenance costs.

2. It includes a three-layer sealing structure, including:

1) The labyrinth seal structure (first sealing layer) formed by the retaining ring and the end cover can effectively increase the liquid level and prevent the lubricating oil from flowing out.

2) The first pressure plate and the packing cooperate as the second sealing layer, which can effectively prevent the leakage of lubricating oil.

3) The V-shaped seal, in cooperation with the first pressure plate and the second pressure plate, serves as the third sealing layer, which can effectively block outside air, rainwater and dust from entering the bearing seat, thus avoiding affecting the quality of the lubricating oil.

3. The bottom of the first oil storage sub-cavity and the bottom of the second oil storage sub-cavity are connected through an internal circulation pipe to form an internal circulation loop, so that the precipitated impurities will not stay at the bottom of the first oil storage sub-cavity and the bottom of the second oil storage sub-cavity. Moreover, with the cooperation of the external circulation loop and the internal circulation loop, the flowing lubricating oil will bring out the impurities in the oil storage cavity, reduce the impact of impurities on the main bearing roller, and increase the service life.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the services required for use in the embodiments or the prior art descriptions 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 paying creative work.

FIG1 is a schematic diagram of a main bearing oil lubrication seal structure of a wind turbine generator set according to the present invention;

FIG2 is a second schematic diagram of an oil lubrication seal structure for a main bearing of a wind turbine generator set according to the present invention;

FIG3 is a third schematic diagram of an oil lubrication seal structure for a main bearing of a wind turbine generator set according to the present invention;

Fig. 4 is a cross-sectional view of the A-A position in Fig. 2;

Fig. 5 is a cross-sectional view of the B-B portion in Fig. 3;

FIG6 is a partial enlarged view of point C in FIG4 (a is the effective sealing liquid level, b is the main bearing lubrication liquid level);

FIG. 7 is a partial enlarged view of point D in FIG. 5 .

Reference numerals:

1- retaining ring; 2-end cover; 3-main shaft; 4-main bearing; 5-bearing seat; 6-oil retaining member; 7-first pressure plate; 8-packing; 9-V-type seal; 10-second pressure plate; 11-internal circulation pipeline; 12-first return oil pipeline; 13-second return oil pipeline; 14-first sealing ring; 15-return oil channel; 16-second sealing ring.

DETAILED DESCRIPTION

The utility model is further described below in conjunction with specific implementation methods:

As shown in Figures 1 to 7, the main bearing oil lubrication sealing structure of a wind turbine generator set described in this embodiment includes a retaining ring 1, an end cover 2, a main shaft 3, a main bearing 4, a bearing seat 5 and a gear box; the main shaft 3 is installed on the bearing seat 5 through the main bearing 4; the retaining ring 1 and the end cover 2 are both installed on the main shaft 3; an oil retaining member 6 is provided in the bearing seat 5; the retaining ring 1, the end cover 2, the main shaft 3, the main bearing 4, the bearing seat 5 and the oil retaining member 6 cooperate to form an oil storage cavity; the oil storage cavity is connected to the oil tank of the gear box.

Specifically, this embodiment is provided with the following three sealing layers:

1) The end cover 2 is arranged on the periphery of the retaining ring 1 and cooperates with the retaining ring 1 in a non-contact manner to form a labyrinth sealing structure, that is, the first sealing layer.

2) The front end of the end cover 2 is provided with a first pressure plate 7 detachably connected thereto (by bolts); a packing 8 is provided at the outlet of the labyrinth seal structure; the first pressure plate 7 limits and fixes the packing 8; the first pressure plate 7 and the packing 8 cooperate to form a second sealing layer.

3) A waterproof and dustproof component is provided at the periphery of the labyrinth sealing structure outlet, and the waterproof and dustproof component includes an elastic V-shaped seal 9 and a second pressure plate 10; the second pressure plate 10 is arranged in front of the first pressure plate 7; the V-shaped seal 9 is connected with the first pressure plate 7 under the action of the second pressure plate 10, thereby sealing the periphery of the labyrinth sealing structure outlet; the V-shaped seal 9 acts as the third sealing layer in cooperation with the first pressure plate 7 and the second pressure plate 10.

Specifically, in this embodiment, the main bearing 4 is located in the middle of the oil storage cavity, dividing the oil storage cavity into a first oil storage sub-cavity and a second oil storage sub-cavity; the bottom of the first oil storage sub-cavity and the bottom of the second oil storage sub-cavity are connected through an internal circulation pipe 11 to form an internal circulation loop.

Specifically, in this embodiment, the oil storage cavity is connected to the oil tank of the gear box and includes the following two structures:

The first structure:

A first oil return pipe 12 is provided in the end cover 2; a second oil return pipe 13 is provided in the bearing seat 5; one end of the first oil return pipe 12 is connected to the oil storage cavity, and the other end is connected to one end of the second oil return pipe 13; the other end of the second oil return pipe 13 is connected to the rear end of the oil baffle 6, and the rear end of the oil baffle 6 is connected to the oil tank of the gear box. A first sealing ring 14 is provided at the connection point between the first oil return pipe 12 and the second oil return pipe 13.

The second structure:

An oil return passage 15 is provided between the top end of the oil baffle 6 and the main shaft 3 , and the oil return passage 15 leads to the rear end of the oil baffle 6 , that is, is also connected to the oil tank of the gear box.

A second sealing ring 16 is provided between the end cover 2 and the bearing seat 5 .

The working principle of this embodiment is as follows:

An oil retaining member 6 is arranged in the bearing seat 5. Under the effect of a certain inclination angle of the unit, the depth of the oil storage cavity is deepened and the amount of lubricating oil is increased, so that the front end of the main bearing 4 can be lubricated by oil bath. In conjunction with the oil injection system on the top of the bearing seat 5 and the front end cover 2, the lubrication of the main bearing 4 meets the design requirements.

When the liquid level in the oil storage chamber is too high, part of the overflowed lubricating oil will pass through the first oil return pipe 12 and the second oil return pipe 13 in turn, enter the rear end of the oil baffle 6 and then flow back to the oil tank of the gear box; another part of the overflowed lubricating oil will enter the rear end of the oil baffle 6 through the oil return channel 15 and also flow back to the oil tank of the gear box; under normal operating conditions of the unit, an external circulation loop can be formed, and the main bearing 4 and the gear box use gear oil for oil lubrication. There is no need to replace the lubricating oil in the oil storage chamber separately, which saves operation and maintenance time and reduces operation and maintenance costs.

It includes three-layer sealing structure, including:

1) The labyrinth seal structure (first sealing layer) formed by the retaining ring 1 and the end cover 2 can effectively increase the liquid level and prevent the lubricating oil from flowing out.

2) The first pressure plate 7 and the packing 8 cooperate to serve as the second sealing layer, which can effectively prevent the leakage of lubricating oil.

3) The V-shaped seal 9, in cooperation with the first pressure plate 7 and the second pressure plate 10, serves as the third sealing layer, which can effectively block the outside air, rainwater and dust from entering the bearing seat 5, thereby avoiding affecting the quality of the lubricating oil.

The bottom of the first oil storage sub-cavity and the bottom of the second oil storage sub-cavity are connected through the internal circulation pipe 11 to form an internal circulation loop, so that the precipitated impurities will not stay at the bottom of the first oil storage sub-cavity and the bottom of the second oil storage sub-cavity, and with the cooperation of the external circulation loop and the internal circulation loop, the flowing lubricating oil will bring out the impurities in the oil storage cavity, reducing the impact of the impurities on the rollers of the main bearing 4 and improving the service life.

The embodiments described above are only preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made based on the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A main bearing oil lubrication sealing structure of a wind turbine generator set, comprising a retaining ring, an end cover, a main shaft, a main bearing, a bearing seat and a gear box; The main shaft is mounted on the bearing seat through the main bearing; The retaining ring and the end cover are both installed on the main shaft; It is characterized in that An oil retaining member is provided in the bearing seat; The retaining ring, end cover, main shaft, main bearing, bearing seat and oil retaining member cooperate to form an oil storage cavity; The oil storage cavity is communicated with the oil tank of the gear box. 2. An oil lubrication sealing structure for a main bearing of a wind turbine generator set according to claim 1, characterized in that the end cover is arranged on the periphery of the retaining ring and cooperates with the retaining ring in a non-contact manner to form a labyrinth sealing structure. 3. The oil lubrication sealing structure for the main bearing of a wind turbine generator set according to claim 2, characterized in that a first pressing plate detachably connected to the front end of the end cover is provided; Packing is provided at the outlet of the labyrinth seal structure; The first pressing plate limits and fixes the packing. 4. An oil lubrication sealing structure for a main bearing of a wind turbine generator set according to claim 3, characterized in that a waterproof and dustproof component is provided on the periphery of the outlet of the labyrinth sealing structure. 5. A wind turbine generator set main bearing oil lubrication sealing structure according to claim 4, characterized in that the waterproof and dustproof component comprises an elastic V-shaped sealing member and a second pressure plate; The second pressing plate is arranged in front of the first pressing plate; The V-shaped sealing member is in contact with the first pressing plate under the action of the second pressing plate, thereby sealing the periphery of the outlet of the labyrinth sealing structure. 6. The oil lubrication sealing structure for the main bearing of a wind turbine generator set according to claim 1, characterized in that the main bearing is located in the middle of the oil storage cavity, and the oil storage cavity is divided into a first oil storage sub-cavity and a second oil storage sub-cavity; The bottom of the first oil storage sub-cavity is connected to the bottom of the second oil storage sub-cavity through an internal circulation pipeline to form an internal circulation loop. 7. The oil lubrication sealing structure for the main bearing of a wind turbine generator set according to claim 1, characterized in that a first oil return pipeline is provided in the end cover; A second oil return pipeline is provided in the bearing seat; One end of the first oil return pipeline is connected to the oil storage cavity, and the other end is connected to one end of the second oil return pipeline; The other end of the second oil return pipeline is communicated with the oil tank of the gear box. 8. An oil lubrication sealing structure for a main bearing of a wind turbine generator set according to claim 7, characterized in that a first sealing ring is provided at the connecting point between the first oil return pipeline and the second oil return pipeline. 9. An oil lubrication sealing structure for a main bearing of a wind turbine generator set according to claim 1, characterized in that an oil return channel is provided between the top end of the oil retaining member and the main shaft, and the oil return channel is connected to the oil tank of the gear box. 10. The oil lubrication sealing structure of the main bearing of a wind turbine generator set according to claim 1, characterized in that a second sealing ring is provided between the end cover and the bearing seat.