A self-priming energy-saving grease removal device for variable pitch bearings of wind turbines

Abstract

A self-priming energy-saving grease drainage device for a variable pitch bearing of a wind turbine relates to the technical field of variable pitch bearings, comprising a variable pitch bearing body, an oil extraction pipe, a micro gear pump, an oil drainage pipe and an oil collecting bottle; a plurality of grease drainage holes for discharging waste grease inside the variable pitch bearing body are evenly and spacedly arranged on the radial surface of the ring of the variable pitch bearing body, and the grease drainage holes are connected to one end of the oil extraction pipe; as needed, the oil extraction pipe and the grease drainage holes are correspondingly fastened and connected by pipe threads, and the connection is firm and reliable; the other end of the oil extraction pipe is correspondingly connected to the oil extraction port of the micro gear pump, and the oil drainage port of the micro gear pump is provided with an oil collecting bottle for collecting the discharged waste grease; the axis of the driving shaft of the micro gear pump is correspondingly parallel to the axis of the variable pitch bearing body; the present invention effectively solves the problem of poor grease drainage of the existing variable pitch bearings of wind turbines.

Description

Technical Field

[0001] The invention relates to the technical field of variable pitch bearings, and in particular to a self-priming energy-saving grease discharge device for a variable pitch bearing of a wind turbine generator. Background Art

[0002] As is known, with the vigorous development of wind power generation technology in the field of green energy in my country, wind turbines have been promoted from the early 500kw small-power wind turbines to megawatt-level, and have now been popularized to 1.5MW, 2MW, 3MW, 5MW, 8MW and other high-power wind turbines, and the installed capacity has also increased dramatically year by year. Up to now, more than tens of thousands of megawatt-level wind turbines have been installed in my country. According to the design requirements of megawatt-level wind turbines, the blades are designed to be installed on variable pitch bearings, which is conducive to the adjustment of the windward angle of the blades, and can effectively improve the utilization rate and power generation of wind turbines;

[0003] In the design of wind turbines, in order to prevent the blades, hubs and other parts and the surrounding environment from being contaminated by the leakage of grease inside the pitch bearing, the pitch bearing sealing strip is designed as a double-lip sealing structure, and a grease discharge hole is reserved on the radial surface of the pitch bearing ring, and an oil collecting bottle or oil collecting bag is installed. Relying on the grease pressure inside the bearing, the waste grease is squeezed into the oil collecting bottle or oil collecting bag through the grease discharge hole. However, since the pitch bearing is in a stationary state for a long time (revolving with the wind turbine main shaft but not rotating on its own) except for a small range of reciprocating pitch rotation, the grease inside the bearing can only be squeezed out of the grease discharge hole by the static pressure of the added grease when the pitch bearing is maintained and greased; since there is a certain distance between the grease injection hole and the grease discharge hole of the pitch bearing, and the internal cavity of the bearing is affected by the steel balls and the retainer, the cross-sectional area of ​​the grease channel inside the bearing suddenly changes. The larger the grease volume, the greater the pressure loss of the grease along the bearing. In addition, the higher viscosity of the waste grease causes a large amount of fresh grease to gather near the grease injection hole inside the pitch bearing, and squeezes the sealing strip to form a gap. A large amount of grease inside the pitch bearing leaks from the sealing strip, while the oil collecting bottle installed on the pitch bearing is often unable to collect the grease. In order to solve the serious grease leakage of the pitch bearing due to grease leakage from the sealing strip, some manufacturers have designed and manufactured electric grease suction pumps to suck out the grease from the grease discharge hole, and to avoid grease leakage from the sealing strip by reducing the grease pressure inside the pitch bearing. However, on the one hand, the electric grease suction pump is expensive and difficult to promote. On the other hand, the oil pipe of the electric grease suction pump is too long, and the grease suction and discharge effect is not ideal. Finally, the problem of grease leakage in the pitch bearing seal has not been solved. The above phenomenon is a problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0004] In order to overcome the deficiencies in the background technology, the present invention discloses a self-priming energy-saving grease removal device for a variable pitch bearing of a wind turbine.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A self-priming energy-saving grease drainage device for a variable pitch bearing of a wind turbine comprises a variable pitch bearing body, an oil extraction pipe, a micro gear pump, an oil drainage pipe and an oil collecting bottle; a plurality of grease drainage holes for discharging waste grease inside the variable pitch bearing body are evenly spaced on the radial surface of the ring of the variable pitch bearing body, and the grease drainage holes are connected to one end of the oil extraction pipe; as needed, the oil extraction pipe and the grease drainage holes are correspondingly fastened and connected by pipe threads, and the connection is firm and reliable; the other end of the oil extraction pipe is correspondingly connected to the oil extraction port of the micro gear pump, and the oil drainage port of the micro gear pump is provided with an oil collecting bottle for collecting the discharged waste grease; the axis of the drive shaft of the micro gear pump is correspondingly parallel to the axis of the variable pitch bearing body, the input end of the drive shaft is fastened to one end of a weight, and the other end of the weight does not interfere with the radial surface of the ring of the variable pitch bearing body.

[0007] Preferably, the oil drain pipe is bent at a right angle, and the axis of the oil outlet of the oil drain pipe is parallel to the axis of the pitch bearing body.

[0008] Preferably, the oil extraction pipe and the grease discharge hole are fastened and connected correspondingly via pipe threads.

[0009] Preferably, a sealing ring is provided between the outer tube wall of the oil extraction pipe and the hole wall of the grease discharge hole.

[0010] Preferably, the oil collecting bottle is a transparent plastic bottle.

[0011] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects:

[0012] The invention discloses a self-priming energy-saving grease drainage device for a variable pitch bearing of a wind turbine. The device has a simple structure, is easy to assemble and has a low production cost. The axis of the driving shaft of the micro gear pump is parallel to the axis of the variable pitch bearing body. The input end of the driving shaft is tightly connected to one end of a weight, and the other end of the weight has no interference with the radial surface of the ring of the variable pitch bearing body. The gravity of the weight is greater than the torque required for the driving shaft to work. That is, when the ring of the variable pitch bearing body revolves with the wind blade and the grease drainage hole is filled with waste grease, the micro gear pump revolves with the ring of the variable pitch bearing body, and the weight always remains in a vertical state under the action of gravity, so that the driving shaft produces relative rotation, that is, the micro gear pump is driven to work by the relative rotation of the weight and the micro gear pump, so as to realize the operation of automatically sucking the waste grease in the grease drainage hole, which is energy-saving and environmentally friendly. The influence of the leakage of waste grease on the life of the variable pitch bearing body is avoided, and the pollution to the environment caused by the leakage of waste grease is also prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] In the figure: 1. Paddle bearing body; 2. Oil extraction pipe; 3. Micro gear pump; 4. Oil drain pipe; 5. Oil collecting bottle; 6. Grease drain hole; 7. Drive shaft; 8. Heavy hammer. DETAILED DESCRIPTION

[0015] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0016] Combined with Figure 1 A self-priming energy-saving grease drainage device for a variable pitch bearing of a wind turbine comprises a variable pitch bearing body 1, an oil extraction pipe 2, a micro gear pump 3, an oil drainage pipe 4 and an oil collecting bottle 5; a plurality of grease drainage holes 6 for discharging waste grease inside the variable pitch bearing body 1 are evenly and spacedly arranged on the radial surface of the ring of the variable pitch bearing body 1, the grease drainage holes 6 are connected to one end of the oil extraction pipe 2, and the other end of the oil extraction pipe 2 is correspondingly connected to the oil extraction port of the micro gear pump 3, and the oil drainage port of the micro gear pump 3 is provided with an oil collecting bottle 5 for collecting the discharged waste grease; the axis of the driving shaft 7 of the micro gear pump 3 is correspondingly parallel to the axis of the variable pitch bearing body 1, and the input end of the driving shaft 7 is fastened with a weight 8 One end, and the other end of the weight 8 does not interfere with the radial surface of the ring of the pitch bearing body 1, the gravity of the weight 8 is greater than the torque required for the drive shaft 7 to work, that is, when the ring of the pitch bearing body 1 revolves with the wind blade and the grease discharge hole 6 is filled with waste grease, the micro gear pump 3 revolves with the ring of the pitch bearing body 1, and the weight 8 always maintains a vertical state under the action of gravity, so that the drive shaft 7 produces relative rotation to drive the micro gear pump 3 to work; if there is no waste grease in the grease discharge hole 6, the micro gear pump 3 can extract part of the air in the pitch bearing body 1 when it works, so that a negative pressure environment is generated in the pitch bearing body 1, so that new grease can be smoothly injected;

[0017] In addition, the oil drain pipe 4 is bent at a right angle, and the axis of the oil outlet of the oil drain pipe 4 is parallel to the axis of the pitch bearing body 1, that is, the axis of the oil collecting bottle 5 installed through the oil drain pipe 4 is parallel to the axis of the pitch bearing body 1, which can effectively reduce the radial space occupied by the oil collecting bottle 5 in the pitch bearing body 1; a sealing ring is provided between the outer tube wall of the oil extraction pipe 2 and the hole wall of the grease discharge hole 6, and the sealing ring can effectively ensure that the oil extraction pipe 2 is sealed and connected with the grease discharge hole 6, thereby ensuring that the micro gear pump 3 can generate corresponding negative pressure in the grease discharge hole 6 when working; the oil collecting bottle 5 is a transparent plastic bottle, which can facilitate the staff to regularly check the amount of oil in the oil collecting bottle 5, so as to timely clean up the waste grease collected in the oil collecting bottle 5.

[0018] The self-priming energy-saving grease drainage device for the variable pitch bearing of a wind turbine described in the present invention is implemented. When in use, the grease drainage hole 6 is connected to the micro gear pump 3 through the oil extraction pipe 2, and the micro gear pump 3 can be fastened and connected to the corresponding ring of the variable pitch bearing body 1 through the oil extraction pipe 2; when the ring of the variable pitch bearing body 1 revolves with the wind blade and the grease drainage hole 6 is filled with waste grease, the micro gear pump 3 revolves with the ring of the variable pitch bearing body 1, and the weight 8 always remains in a vertical state under the action of gravity, so that the drive shaft 7 produces relative rotation to drive the micro gear pump 3 to work, thereby automatically extracting the waste grease in the grease drainage hole 6.

[0019] The parts not described in detail in this invention are prior art.

Claims

1. A self-priming energy-saving grease removal device for a variable pitch bearing of a wind turbine generator, comprising a variable pitch bearing body (1), characterized in that: It also comprises an oil extraction pipe (2), a micro gear pump (3), an oil discharge pipe (4) and an oil collecting bottle (5); a plurality of grease discharge holes (6) for discharging waste grease inside the pitch bearing body (1) are evenly spaced and arranged on the radial surface of the ring of the pitch bearing body (1); the grease discharge holes (6) are connected to one end of the oil extraction pipe (2); the other end of the oil extraction pipe (2) is correspondingly connected to the oil extraction port of the micro gear pump (3); the oil discharge port of the micro gear pump (3) is provided with an oil collecting bottle (5) for collecting the discharged waste grease; the axis of the drive shaft (7) of the micro gear pump (3) is correspondingly parallel to the axis of the pitch bearing body (1); the input end of the drive shaft (7) is fastened to one end of a weight (8), and the other end of the weight (8) does not interfere with the radial surface of the ring of the pitch bearing body (1); The gravity of the weight (8) is greater than the torque required for the drive shaft (7) to work. When the ring of the variable pitch bearing body (1) revolves with the wind blade and the grease discharge hole (6) is filled with waste grease, the micro gear pump (3) revolves with the ring of the variable pitch bearing body (1). The weight (8) always remains in a vertical state under the action of gravity, thereby causing the drive shaft (7) to rotate relatively to drive the micro gear pump (3) to work; if there is no waste grease in the grease discharge hole (6), the micro gear pump (3) can extract part of the air in the variable pitch bearing body (1) when it works, thereby generating a negative pressure environment in the variable pitch bearing body (1) so that new grease can be smoothly injected.

2. The self-priming energy-saving grease removal device for the variable pitch bearing of a wind turbine according to claim 1 is characterized in that: The oil drain pipe (4) is bent at a right angle, and the axis of the oil outlet of the oil drain pipe (4) is parallel to the axis of the variable pitch bearing body (1).

3. The self-priming energy-saving grease removal device for the variable pitch bearing of a wind turbine according to claim 1 is characterized in that: The oil extraction pipe (2) and the grease discharge hole (6) are fastened and connected correspondingly via pipe threads.

4. The self-priming energy-saving grease removal device for the variable pitch bearing of a wind turbine according to claim 1 is characterized in that: A sealing ring is provided between the outer tube wall of the oil extraction tube (2) and the hole wall of the grease discharge hole (6).

5. The self-priming energy-saving grease removal device for the variable pitch bearing of a wind turbine according to claim 1 is characterized in that: The oil collecting bottle (5) is a transparent plastic bottle.

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