Main shaft end cover of wind driven generator

Abstract

The utility model discloses a wind driven generator main shaft end cover which comprises a wind power main shaft, a supporting bearing seat is arranged on the wind power main shaft, wind driven generator main shaft end covers are arranged on the two sides of the supporting bearing seat, and an oil injection hole used for injecting lubricating oil into the supporting bearing seat is formed in the upper end face of the supporting bearing seat. Through the combined use of wind driven generator main shaft end covers fixed by bolts on the two sides of a supporting bearing seat, air channel grooves in the wind driven generator main shaft end covers, heat dissipation air holes and dustproof ventilation screen plates, inner bearing rings of main bearings which are symmetrically arranged can rotate along with rotation of a wind power main shaft; when cooling and heat dissipation are carried out, external cold air enters one sides of the main bearings symmetrically arranged in the supporting bearing seat through the heat dissipation air holes obliquely formed in the end cover of the main shaft of the wind driven generator to carry out cooling and heat dissipation, and meanwhile the cold air can be directly blown to the main bearings through the air duct grooves; and in addition, under the cooperation of the annular air duct groove and the multiple heat dissipation air holes, all-directional cooling and heat dissipation of the main bearing can be achieved, and the durability of the main bearing is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of main shaft end covers of wind turbine generators, and in particular relates to a main shaft end cover of a wind turbine generator. Background Art

[0002] The overall design technology of wind turbines has been gradually developed in the past 30 years. At present, in actual applications, each wind farm has different levels and responsibilities for wind turbine operation and maintenance. Many bearings cannot meet the requirements of fully lubricated use environment. The use environment is a wind farm, and the wind load changes suddenly. Over time, wear and tear will appear between the bearing roller and the outer ring. The worn metal filings fall into the bearing and the end cover. The bearing is not cleaned out in time. The continued operation and wear of the bearing during operation accelerates the wear of the bearing. After long-term wear, the gap between the rear bearing roller and the outer ring increases. When the main shaft system of the wind turbine is subjected to the thrust from the wind wheel again, that is, the axial force, the entire shaft system will move backward due to the increase in this gap.

[0003] To this end, a wind turbine main shaft bearing unloading device with the announcement number "CN217327567U" includes an electromagnet, which is arranged on the side wall of the split end cover on one side of the axial movement direction of the bearing; a compression spring, which is arranged on the same side of the bearing as the electromagnet, and one end of which abuts against the side wall of the bearing; a lever, which is rotatably connected to the split end cover, one end of which abuts against the compression spring, and the other end abuts against the electromagnet, and the action of the electromagnet drives the lever to rotate to apply pressure to the compression spring. When the wind turbine main shaft system has less movement, timely installation of the main shaft bearing unloading device can effectively share and reduce the axial force on the rear bearing, reduce the wear of the rear bearing, and make the unloading device work effectively. The compression spring group is low in cost, which avoids the replacement of the lower tower of the main shaft system due to the wear of the rear bearing, and avoids the cost of replacing the lower tower of the main shaft system.

[0004] However, for the above-mentioned wind turbine main shaft bearing unloading device, although a part of the axial force of the unit is transmitted to the main frame through the end cover, the axial force on the rear bearing is reduced, thereby reducing the wear of the rear bearing and delaying its life, there are still the following obvious defects during use: the end cover in the above-mentioned main shaft only plays a role in reducing the pressure on the rear bearing. Since no corresponding ventilation and cooling mechanism is set in the end cover, it is easy for the long-term rotational friction between the steel ball in the bearing and the bearing ring to cause high temperature. If the temperature is not reduced and the heat is not dissipated in time, the bearing will be deformed due to high temperature, which will increase the problem of friction damage to the bearing parts. Utility Model Content

[0005] The utility model aims to provide a main shaft end cover of a wind turbine generator to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wind turbine main shaft end cover, including a wind turbine main shaft, a supporting bearing seat is provided on the wind turbine main shaft, and wind turbine main shaft end covers are provided on both sides of the supporting bearing seat, the upper end surface of the supporting bearing seat is provided with an oil filling hole for injecting lubricating oil into the interior of the supporting bearing seat, one end of the main shaft hole opened at the center position of the wind turbine main shaft end cover is provided with a dustproof sealing ring extending to the interior of both ends of the supporting bearing seat and used for sealing with the surface of the wind turbine main shaft, the dustproof sealing ring is provided with an air duct groove on one side contacting the interior of the supporting bearing seat, and the interior of the air duct groove is evenly provided with heat dissipation air holes with an inclined through structure.

[0007] Preferably, the support bearing seat includes an upper bearing seat and a lower support bearing seat. The bottom of the lower support bearing seat is provided with a fixing seat for installing the support bearing seat inside the wind turbine cabin. The upper bearing seat and the lower support bearing seat are both semicircular and fixed to the wind turbine main shaft by screws, which can facilitate the disassembly and assembly of the support bearing seat when the main shaft is replaced in the later stage.

[0008] Preferably, main bearings are symmetrically arranged inside the support bearing seat, and a channel cavity for oil injection and air intake and heat dissipation is formed between the main bearings, so that lubricating oil for lubricating the bearings can be injected into the main bearings for lubrication, thereby reducing friction loss of the main bearings.

[0009] Preferably, the oil filling hole is located at the port at the upper end of the support bearing seat and is connected to an oil filling pipe with a T-shaped structure. The oil filling pipe is located inside the channel cavity and corresponds to one side of the main bearing, which is beneficial to injecting lubricating oil into the main bearing symmetrically arranged inside the support bearing seat to reduce friction caused by over-load.

[0010] Preferably, the surface side of the wind turbine main shaft end cover is penetrated by screw holes, and the wind turbine main shaft end cover is fixed to the two side surfaces of the supporting bearing seat by inserting screws into the screw holes. The wind turbine main shaft end cover can be fixed to the two sides of the supporting bearing seat by bolts to achieve sealing effect.

[0011] Preferably, a dust-proof and air-permeable mesh plate is provided inside the air outlet of the heat dissipation air hole on one side of the outer side of the main shaft end cover of the wind turbine to prevent dust from entering, so that external wind can enter through the heat dissipation air hole to cool and dissipate the bearing inside the supporting bearing seat.

[0012] Compared with the prior art, the technical effects and advantages of the utility model are as follows: the main shaft end cover of the wind turbine generator is fixed by bolts on both sides of the supporting bearing seat, and the wind duct groove on the side of the main bearing of the wind turbine generator main shaft end cover corresponding to the main bearing is used in combination with the heat dissipation holes and the dust-proof and ventilated mesh plate. When the wind turbine main shaft rotates, the inner bearing ring of the symmetrically arranged main bearing follows the rotation. When cooling and dissipating heat, the external cold wind enters through the heat dissipation holes obliquely arranged on the main shaft end cover of the wind turbine generator to one side of the main bearing symmetrically arranged inside the supporting bearing seat for cooling and dissipating heat. At the same time, the cold wind can be directly blown on the main bearing by the air duct groove. The air duct groove is annular and the cooperation of multiple heat dissipation holes can realize all-round cooling and heat dissipation of the main bearing, further improve the durability of the main bearing, and solve the problem in the comparative document that the long-term rotational friction between the steel ball and the bearing ring in the bearing is easy to cause high temperature due to the lack of corresponding ventilation and cooling mechanism in the end cover. If the cooling and heat are not timely, the bearing will be deformed at high temperature and the friction damage of the bearing parts will be increased.

[0013] By connecting an oil filling pipe of a T-shaped structure at one end of the oil filling hole, and extending both ends of the oil filling pipe to one side of a symmetrically arranged main bearing, the injected lubricating oil can be accurately injected into the interior of one side of the main bearing through the oil filling pipe, so that the friction position of the main bearing can be quickly lubricated by the lubricating oil, and the lubricating oil can be evenly applied to the interior of the main bearing when the main bearing rotates, thereby avoiding the problem of excessive lubricating oil in the main bearing causing increased friction, causing overheating of the bearing, causing the lubricating oil to deteriorate and the fluidity to deteriorate, thereby reducing its lubrication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a left-side structural schematic diagram of the main shaft end cover of the wind turbine generator of the utility model;

[0016] Figure 3 This is a schematic diagram of the right side structure of the main shaft end cover of the wind turbine generator of the utility model;

[0017] Figure 4 This is a schematic diagram of the external structure of the support bearing seat of the utility model from the main view.

[0018] In the figure: 1. Wind turbine main shaft; 2. Support bearing seat; 3. Wind turbine main shaft end cover; 4. Dustproof sealing ring; 5. Air duct groove; 6. Heat dissipation vents; 7. Dustproof and ventilated mesh plate; 8. Oil filling hole; 9. Upper bearing seat; 10. Lower support bearing seat; 11. Fixed seat; 12. Main bearing; 13. Channel cavity; 14. Oil filling pipe; 15. Screw hole. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-4 The utility model discloses a main shaft end cover of a wind turbine generator, comprising a wind turbine main shaft 1. A support bearing seat 2 is arranged on the wind turbine main shaft 1, so that the wind turbine main shaft 1 can be supported in rotation during the rotation process after the support bearing seat 2 is installed with a support block, and wind turbine main shaft end covers 3 are arranged on both sides of the support bearing seat 2, which can seal the two ends of the wind turbine main shaft 1 inside the support bearing seat 2 and have the functions of air intake, cooling and heat dissipation. An oil injection hole 8 for injecting lubricating oil into the support bearing seat 2 is arranged on the upper end surface of the support bearing seat 2, so that the main bearing 12 can be injected into the main bearing 12 through the oil injection hole 8 when the main bearing 12 lacks lubricating oil. The main shaft hole opened at the center of the wind turbine main shaft end cover 3 is provided at one end There is a dustproof sealing ring 4 extending to the inside of both ends of the support bearing seat 2 and used to seal with the surface of the wind turbine main shaft 1, which can reduce the external dust from following the cold wind into the inside of the support bearing seat 2, thereby affecting the lubrication effect of the lubricating oil on the main bearing 12 and reducing the wear of the main bearing 12. The dustproof sealing ring 4 is provided with an air duct groove 5 on the side contacting the inside of the support bearing seat 2, so that the external wind can enter the inside of the support bearing seat 2 and evenly cover the entire main bearing 12 for cooling and heat dissipation. The inside of the air duct groove 5 is evenly provided with heat dissipation air holes 6 with an inclined through structure, so that the external cold air can enter the inside of the support bearing seat 2 in a ring shape to dissipate heat and cool the entire main bearing 12.

[0021] The support bearing seat 2 includes an upper bearing seat 9 and a lower support bearing seat 10, which is convenient for replacing the main bearing 12 arranged inside the support bearing seat 2 and removing the upper bearing seat 9. The bottom of the lower support bearing seat 10 is provided with a fixing seat 11 for installing the support bearing seat 2 inside the wind turbine cabin, which can keep the support bearing seat 2 stable inside the wind turbine cabin during the rotation of the wind turbine main shaft 1, thereby improving the load rotation capacity of the wind turbine main shaft 1. The upper bearing seat 9 and the lower support bearing seat 10 are both semicircular and fixed to the wind turbine main shaft 1 by screws, which is convenient for disassembly of the support bearing seat 2 to inspect and repair the wind turbine main shaft 1 and perform routine maintenance. The main bearings 12 are symmetrically arranged inside the support bearing seat 2. The main bearings 12 can make the wind turbine main shaft 1 rotate more smoothly and increase the load rotation capacity of the wind turbine main shaft 1. A channel cavity 13 for oiling and air heat dissipation is formed between the main bearings 12, which can enable the wind entering from the outside to cool down the entire support bearing seat 2 and dissipate heat to reduce load friction.

[0022] The oil filling hole 8 is located at the port at the upper end of the inner part of the supporting bearing seat 2 and is connected to an oil filling pipe 14 of a T-shaped structure. The lubricating oil injected from the oil filling hole 8 is evenly injected into the rotating main bearing 12 through the oil filling pipe 14 to avoid excessive lubricating oil from generating air bubbles in the bearing, which will cause the performance of the lubricating oil to deteriorate, causing the bearing to lose its lubricating effect, thereby increasing friction and overheating of components. In addition, the lubricating oil may cause the internal pressure of the bearing to increase, thereby causing abnormal vibration and noise during operation of the bearing, which may eventually lead to bearing failure. The oil filling pipe 14 is located inside the channel cavity 13 and is connected to the main bearing Corresponding to one side of 12, the lubricating oil can be evenly injected into the symmetrically arranged main bearing 12 for lubrication. The surface side of the wind turbine main shaft end cover 3 is penetrated with a screw through-hole 15, which can seal the two ends of the supporting bearing seat 2 and the wind turbine main shaft 1, and the wind turbine main shaft end cover 3 is fixed to the two sides of the supporting bearing seat 2 by inserting some screws into the screw through-hole 15. The inner side of the air outlet of the heat dissipation air hole 6 on the outer side of the wind turbine main shaft end cover 3 is provided with a dust-proof and ventilated mesh plate 7 to prevent dust from entering, thereby reducing the mixing entering the interior of the main bearing 12 and increasing the friction between the lubricating oil and the main bearing 12.

[0023] Specifically, when in use, when the wind turbine main shaft 1 rotates, the inner bearing ring of the main bearing 12 symmetrically arranged inside the supporting bearing seat 2 rotates, and at the same time, the lubricating oil is injected into one side of the main bearing 12 through the oil filling hole 8 through the oil filling pipe 14. The rotation of the bearing ring inside the main bearing 12 can make the lubricating oil evenly spread on the inside of the main bearing 12 for lubrication, and play a role in cooling the main bearing 12. After the external cold air evenly enters the inside of the air duct groove 5 through the heat dissipation air holes 6, the external cold air enters one side of the main bearing 12 symmetrically arranged inside the supporting bearing seat 2 through the heat dissipation air holes 6 obliquely arranged on the wind turbine main shaft end cover 3 for cooling and heat dissipation. At the same time, the air duct groove 5 can be used to make the cold air blow directly on the main bearing 12, and the air duct groove 5 is annular and with the cooperation of multiple heat dissipation air holes 6, it can achieve all-round cooling and heat dissipation of the main bearing 12, further improving the durability of the main bearing 12.

[0024] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wind turbine main shaft end cover, comprising a wind turbine main shaft (1), wherein a support bearing seat (2) is provided on the wind turbine main shaft (1), and wind turbine main shaft end covers (3) are provided on both sides of the support bearing seat (2), and an oil injection hole (8) for injecting lubricating oil into the support bearing seat (2) is provided on the upper end surface of the support bearing seat (2), characterized in that: One end of the main shaft hole opened at the center of the main shaft end cover (3) of the wind turbine generator is provided with a dustproof sealing ring (4) extending to the inside of both ends of the support bearing seat (2) and used for sealing with the surface of the wind turbine main shaft (1); a side of the dustproof sealing ring (4) contacting the inside of the support bearing seat (2) is provided with an air duct groove (5); the inside of the air duct groove (5) is evenly provided with heat dissipation air holes (6) of an inclined through structure.

2. The wind turbine main shaft end cover according to claim 1, characterized in that: The support bearing seat (2) comprises an upper bearing seat (9) and a lower support bearing seat (10); a fixing seat (11) for mounting the support bearing seat (2) inside the wind turbine cabin is provided at the bottom of the lower support bearing seat (10); the upper bearing seat (9) and the lower support bearing seat (10) are both semicircular and fixed to the wind turbine main shaft (1) by screws.

3. The wind turbine main shaft end cover according to claim 1, characterized in that: Main bearings (12) are symmetrically arranged inside the support bearing seat (2), and a channel cavity (13) for oil injection and air intake and heat dissipation is formed between the main bearings (12).

4. The wind turbine main shaft end cover according to claim 2, characterized in that: The oil injection hole (8) is located at the port at the upper end of the support bearing seat (2) and is connected to an oil injection pipe (14) with a T-shaped structure. The oil injection pipe (14) is located inside the channel cavity (13) and corresponds to one side of the main bearing (12).

5. The wind turbine main shaft end cover according to claim 1, characterized in that: The surface side of the wind turbine main shaft end cover (3) is penetrated with screw holes (15), and the wind turbine main shaft end cover (3) is fixed to the two side surfaces of the supporting bearing seat (2) by screws inserted into the screw holes (15).

6. The main shaft end cover of a wind turbine generator according to claim 1, characterized in that: A dustproof and air-permeable mesh plate (7) is provided inside the air outlet of the heat dissipation air hole (6) on one side outside the main shaft end cover (3) of the wind turbine generator to prevent dust from entering.

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