A claw-shaped oil collection sealing device

Abstract

The utility model provides a kind of claw shape oil collection sealing device, oil storage ring is fixed on rotating shaft, and oil storage ring is provided with the oil storage cavity that is annular as a whole in, first connecting ring is connected on the side of oil storage ring close to sealing cavity;Sealing ring cross section is U-shaped, and sealing ring includes outer sealing ring, inner sealing ring and second connecting ring, and second connecting ring is connected on the side of first connecting ring close to sealing cavity, so that outer sealing ring is inserted into the recess provided on the side wall of bearing seat, and inner sealing ring is inserted into sealing cavity, and sealing lip is provided on the inner circular surface of outer sealing ring and the outer circular surface of inner sealing ring on the side wall of second connecting ring close to sealing cavity, and all sealing lips are in contact with bearing seat and sealed;Oil inlet hole for connecting oil storage cavity and sealing cavity is arranged on oil storage ring.The sealing device can seal the lubricating grease in the variable pitch bearing, and has the functions of old grease discharge and collection, to avoid lubricating grease leakage.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for pitch bearings of wind turbine generator sets, specifically to a claw-shaped oil collecting and sealing device for sealing the grease in pitch bearings of wind turbine generator sets. Background Technology

[0002] In the process of converting wind energy into electrical energy, the pitch system is a crucial component ensuring power generation efficiency and overall machine safety. The pitch bearing within this system is a key joint connecting the blades and the hub, providing robust support for the efficient operation of the entire machine. The pitch bearing is installed inside the hub of the wind turbine; its outer ring is bolted to the hub, and its inner ring is connected to the blades, allowing rotation to adjust the blade angle. When wind speeds are too high or too low, adjusting the blade pitch changes the angle of attack of the airflow on the blades, thereby altering the aerodynamic torque obtained by the wind turbine and maintaining stable power output. Simultaneously, the turbine's starting process also requires pitch adjustment to obtain sufficient starting torque. The pitch bearing operates under conditions of low-speed oscillation, vibration, shock, fretting wear, and corrosion, primarily bearing axial force and overturning moment. Research has found that the load distribution of the pitch bearing under overturning moment does not perfectly conform to a cosine law; a light-load region with theoretically zero contact pressure appears near the overturning axis, and the size of this light-load region increases with increasing clearance. To reduce or eliminate light-load areas, bearings with ball-shaped rolling elements can achieve negative clearance through a slight interference fit between the steel balls and the raceways, resulting in a more uniform load distribution. To reduce wear on the rolling elements and raceways, grease needs to be injected into the pitch bearing to keep it lubricated. However, during use, the grease can deteriorate and become contaminated with wear debris, affecting its lubrication performance and jeopardizing bearing safety. To ensure proper lubrication, intermittent grease injection is necessary. After injecting new grease, excess old grease needs to be drained. Furthermore, to prevent the drained old grease from dripping and polluting the environment and affecting subsequent maintenance safety, it is necessary to develop a device that can seal the grease inside the pitch bearing while also draining and collecting old grease. Summary of the Invention

[0003] This invention provides a claw-shaped oil collection and sealing device, which can seal the grease in the pitch bearing and has the functions of old grease discharge and collection, thus preventing grease leakage.

[0004] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

[0005] A claw-shaped oil collecting and sealing device is installed between a rotating shaft and a pitch bearing housing. The rotating shaft is installed inside and extends out of the pitch bearing. The gap between the rotating shaft and the bearing housing is a sealing cavity. The claw-shaped oil collecting and sealing device includes:

[0006] An oil reservoir ring is fixedly sleeved on a rotating shaft, and an oil reservoir cavity that is integrally annular is provided inside the oil reservoir ring;

[0007] The first connecting ring is connected to the oil reservoir ring on the side near the sealing cavity;

[0008] The sealing ring has a U-shaped cross-section and includes an outer sealing ring and an inner sealing ring arranged axially, as well as a second connecting ring connecting the outer sealing ring and the inner sealing ring. The second connecting ring is connected to the side of the first connecting ring near the sealing cavity, so that the outer sealing ring extends into the groove provided on the side wall of the bearing housing and the inner sealing ring extends into the sealing cavity. Sealing lips are provided on the side wall of the second connecting ring near the sealing cavity, on the inner circular surface of the outer sealing ring, and on the outer circular surface of the inner sealing ring. All sealing lips are in contact with the bearing housing for sealing.

[0009] The oil storage ring is provided with oil inlet holes that connect the oil storage chamber and the sealing chamber.

[0010] The sealing ring is provided with an integrally annular spring sheet, and the cross-section of the spring sheet is U-shaped. Under the elastic pressure of the spring sheet, the sealing lip is tightly attached to the bearing seat.

[0011] The bottom of the oil storage ring is connected to an oil collecting bottle, and the mouth of the oil collecting bottle is connected to the oil storage chamber.

[0012] The bottom of the oil storage ring is provided with an installation hole that connects the oil storage chamber to the outside. The diameter of the bottle mouth of the oil collecting bottle matches the diameter of the installation hole. The oil storage ring is provided with a limit groove on the side wall of the installation hole. A limit block is connected to the outer wall of the bottle mouth of the oil collecting bottle. When the bottle mouth of the oil collecting bottle is installed in the installation hole, the limit block is installed in the limit groove.

[0013] The oil storage ring includes an inner oil storage ring, an outer oil storage ring, an outer oil storage retaining ring, and an inner oil storage retaining ring. The inner oil storage ring is tightly fitted and fixed on the rotating shaft. The outer oil storage retaining ring and the inner oil storage retaining ring are respectively connected to both sides of the inner oil storage ring. The outer oil storage ring is connected to the outer circular surface of the outer oil storage retaining ring and the inner oil storage retaining ring, thereby forming an oil storage cavity between the four oil storage rings.

[0014] A clamp is installed on the outer circumference of the inner oil storage ring to tighten the inner oil storage ring onto the rotating shaft.

[0015] The outer circumference of the oil storage ring is provided with a clamp groove, and a clamp is installed in the clamp groove to tighten the oil storage ring.

[0016] The oil storage ring has a notch at the clamp connection, and the notch is sealed with sealant after the clamp is installed.

[0017] Compared with the prior art, the claw-shaped oil collecting and sealing device provided by this utility model has the following advantages: 1. The sealing device provided by this utility model can seal the grease in the pitch bearing. At the same time, through the design of the oil storage ring, the old grease that enters the sealing cavity enters the oil storage cavity through the oil inlet under the action of centrifugal force and gravity and is collected and stored in the oil collection bottle, avoiding grease leakage, and the grease can be discharged and cleaned periodically.

[0018] 2. In this utility model, the sealing ring adopts a "claw-shaped" design, and multiple sealing lips are provided on the sealing ring. They make close contact with the bearing seat from the groove, the sealing cavity and the side wall of the bearing seat respectively, so as to achieve a good sealing effect. At the same time, under the elastic pressure of the spring plate, the sealing lips are always kept in close contact with the bearing seat, further ensuring the sealing effect.

[0019] 3. In this utility model, the oil storage ring is clamped to the rotating shaft by a clamp to ensure the stability of the connection between the oil storage ring and the rotating shaft. The oil storage ring is provided with a notch at the clamp installation point to ensure the convenience of clamp installation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the claw-shaped oil collecting and sealing device provided in Example 1;

[0021] Figure 2 This is a schematic diagram of the overall structure of the claw-shaped oil collecting and sealing device provided in Example 2;

[0022] In the diagram: 1-Bearing, 2-Bearing housing, 201-Groove, 3-Rotating shaft, 4-Sealing cavity, 5-Oil reservoir ring, 501-Inner oil reservoir ring, 502-Outer oil reservoir ring, 503-Outer oil reservoir retaining ring, 504-Inner oil reservoir retaining ring, 6-First connecting ring, 7-Sealing ring, 701-Second connecting ring, 702-Outer sealing ring, 703-Inner sealing ring, 704-Sealing lip, 8-Oil reservoir, 9-Clamp, 10-Spring plate, 11-Oil inlet, 12-Oil collection bottle, 13-Limiting block, 14-Clamp groove. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] Example 1

[0025] The structure of the claw-shaped oil collecting and sealing device provided in this embodiment is as follows: Figure 1As shown, the rotating shaft 3 (i.e., the blade root) of the wind turbine generator is installed between the bearing housing 2 of the pitch bearing 1 and the rotating shaft 3. The rotating shaft is installed inside the pitch bearing and extends out of it. The gap between the rotating shaft and the bearing housing is a sealing cavity 4, which seals the gap between the rotating shaft and the bearing housing to prevent leakage of internal lubricating grease. It should be noted that during normal operation of the wind turbine generator, the bearing housing and the rotating shaft are relatively stationary, but the bearing housing and the rotating shaft rotate together with the main shaft of the wind turbine generator, that is, the bearing housing and the rotating shaft are in relative motion with respect to the wind turbine tower.

[0026] The claw-shaped oil collecting and sealing device provided in this embodiment includes an oil storage ring 5, a first connecting ring 6, and a sealing ring 7. The oil storage ring is fixedly sleeved on the rotating shaft, and an overall annular oil storage cavity 8 is provided inside the oil storage ring. Specifically, the oil storage ring includes an inner oil storage ring 501, an outer oil storage ring 502, an outer oil storage retaining ring 503, and an inner oil storage retaining ring 504. The inner oil storage ring is tightly sleeved and fixed on the rotating shaft. The outer and inner oil storage retaining rings are respectively connected to both sides of the inner oil storage ring. The outer oil storage ring is connected to the outer circular surface of the outer and inner oil storage retaining rings, thereby forming an oil storage cavity among the inner, outer, outer, and inner oil storage retaining rings. In this embodiment, a clamp 9 is installed on the outer circular surface of the inner oil storage ring to tighten the inner oil storage ring onto the rotating shaft. Specifically, the oil storage ring has a notch at the clamp connection, and the notch is sealed with sealant after the clamp is installed.

[0027] The first connecting ring is connected to the oil reservoir ring on the side near the sealing cavity. The sealing ring has a U-shaped cross-section and includes an outer sealing ring 702 and an inner sealing ring 703 arranged axially, as well as a second connecting ring 701 connecting the outer and inner sealing rings. The second connecting ring is connected to the first connecting ring on the side near the sealing cavity, allowing the outer sealing ring to extend into the groove 201 provided on the side wall of the bearing housing, and allowing the inner sealing ring to extend into the sealing cavity. Sealing lips 704 are provided on the side wall of the second connecting ring near the sealing cavity, on the inner circular surface of the outer sealing ring, and on the outer circular surface of the inner sealing ring. All sealing lips are in contact with the bearing housing for sealing. Specifically, a spring plate 10 that is integrally annular is provided inside the sealing ring, and the cross-section of the spring plate is U-shaped. That is, the spring plate is installed inside the outer sealing ring, the second connecting ring, and the inner sealing ring, and the spring plate has a pressure that contracts towards the U-shaped opening. Under the elastic pressure of the spring plate, the sealing lips are tightly attached to the bearing housing.

[0028] In this embodiment, the oil storage ring is provided with oil inlet holes 11 that connect the oil storage chamber and the sealing chamber. When the bearing housing and the rotating shaft rotate together with the main shaft of the wind turbine generator, under the action of centrifugal force, the excess old grease in the pitch bearing enters the oil storage chamber from the sealing chamber through the oil inlet holes and is collected and stored. Under the action of gravity, the old grease is stored at the bottom of the oil storage chamber. It can be cleaned regularly by setting an oil outlet at the bottom of the oil storage chamber, or by directly replacing the new sealing device.

[0029] Example 2

[0030] The structure of the claw-shaped oil collecting and sealing device provided in this embodiment is basically the same as that in Embodiment 1, except that: in this embodiment, the bottom of the oil storage ring is connected to an oil collecting bottle 12, and the bottle opening is connected to the oil storage chamber, such as... Figure 2 As shown. Specifically, the bottom of the oil storage ring is provided with an installation hole connecting the oil storage chamber to the outside. The diameter of the oil collecting bottle's opening matches the diameter of the installation hole. A limiting groove is provided on the side wall of the oil storage ring located in the installation hole. A limiting block is connected to the outer wall of the oil collecting bottle's opening. When the oil collecting bottle's opening is installed in the installation hole, the limiting block 13 is installed in the limiting groove, ensuring that the oil collecting bottle is securely installed in the oil storage ring and preventing the oil collecting bottle from falling off. The old grease stored in the oil storage chamber enters the oil collecting bottle under the action of gravity, and at the same time, under the action of centrifugal force, it is ensured that the old grease will not flow back into the oil storage chamber.

[0031] In this embodiment, a clamp groove 14 is provided on the outer circumference of the oil storage ring. A clamp is installed in the clamp groove to tighten the oil storage ring. The oil storage ring has a cut at the clamp connection. After the clamp is installed, the cut is sealed with sealant. To ensure the installation of the oil collection bottle, an opening is provided on the clamp for the oil collection bottle opening to pass through.

Claims

1. A claw-shaped oil collecting and sealing device, installed between a rotating shaft and a pitch bearing housing, wherein the rotating shaft is installed inside and extends out of the pitch bearing, and the gap between the rotating shaft and the bearing housing is a sealing cavity, characterized in that: The claw-shaped oil collecting and sealing device includes: An oil reservoir ring is fixedly sleeved on a rotating shaft, and an oil reservoir cavity that is integrally annular is provided inside the oil reservoir ring; The first connecting ring is connected to the side of the oil reservoir ring near the sealing cavity; The sealing ring has a U-shaped cross-section and includes an outer sealing ring and an inner sealing ring arranged axially, as well as a second connecting ring connecting the outer sealing ring and the inner sealing ring. The second connecting ring is connected to the side of the first connecting ring near the sealing cavity, so that the outer sealing ring extends into the groove provided on the side wall of the bearing housing and the inner sealing ring extends into the sealing cavity. Sealing lips are provided on the side wall of the second connecting ring near the sealing cavity, on the inner circular surface of the outer sealing ring, and on the outer circular surface of the inner sealing ring. All sealing lips are in contact with the bearing housing for sealing. The oil storage ring is provided with oil inlet holes that connect the oil storage chamber and the sealing chamber.

2. The claw-shaped oil collecting and sealing device according to claim 1, characterized in that: The sealing ring is provided with an integrally annular spring sheet, and the cross-section of the spring sheet is U-shaped. Under the elastic pressure of the spring sheet, the sealing lip is tightly attached to the bearing seat.

3. The claw-shaped oil collecting and sealing device according to claim 1, characterized in that: The bottom of the oil storage ring is connected to an oil collecting bottle, and the mouth of the oil collecting bottle is connected to the oil storage chamber.

4. The claw-shaped oil collecting and sealing device according to claim 3, characterized in that: The bottom of the oil storage ring is provided with an installation hole that connects the oil storage chamber to the outside. The diameter of the bottle mouth of the oil collecting bottle matches the diameter of the installation hole. The oil storage ring is provided with a limit groove on the side wall of the installation hole. A limit block is connected to the outer wall of the bottle mouth of the oil collecting bottle. When the bottle mouth of the oil collecting bottle is installed in the installation hole, the limit block is installed in the limit groove.

5. The claw-shaped oil collecting and sealing device according to claim 1, characterized in that: The oil storage ring includes an inner oil storage ring, an outer oil storage ring, an outer oil storage retaining ring, and an inner oil storage retaining ring. The inner oil storage ring is tightly fitted and fixed on the rotating shaft. The outer oil storage retaining ring and the inner oil storage retaining ring are respectively connected to both sides of the inner oil storage ring. The outer oil storage ring is connected to the outer circular surface of the outer oil storage retaining ring and the inner oil storage retaining ring, thereby forming an oil storage cavity between the four oil storage rings.

6. The claw-shaped oil collecting and sealing device according to claim 5, characterized in that: A clamp is installed on the outer circumference of the inner oil storage ring to tighten the inner oil storage ring onto the rotating shaft.

7. The claw-shaped oil collecting and sealing device according to claim 1, characterized in that: The outer circumference of the oil storage ring is provided with a clamp groove, and a clamp is installed in the clamp groove to tighten the oil storage ring.

8. The claw-shaped oil collecting and sealing device according to claim 6 or 7, characterized in that: The oil storage ring has a notch at the clamp connection, and the notch is sealed with sealant after the clamp is installed.

Images