Variable pitch bearing structure

Abstract

The utility model relates to a variable pitch bearing structure applied to the field of wind power generation, which comprises an outer ring, an inner ring rotatably connected with the inner wall of the outer ring, two sliding chutes dug on the inner wall of the outer ring, a plurality of balls movably embedded on the outer surface of the inner ring, one end of each ball far away from the inner ring positioned in the adjacent sliding chute, a plurality of tooth blocks fixedly connected with the inner wall of the inner ring, and a plurality of tooth blocks fixedly connected with the tooth blocks. A plurality of containing grooves are formed in the upper end of the inner ring, positioning plates are fixedly connected to the longitudinal inner walls of the containing grooves, two compression springs are fixedly connected to the surfaces of the positioning plates, a mounting plate is fixedly connected to the ends, away from the positioning plates, of the two compression springs, and a graphite plate is arranged at the end, away from the compression springs, of the mounting plate; the inner wall of the outer ring and the inner wall of the sliding groove are lubricated through the graphite plate and the graphite protruding block, compared with the mode that lubricating oil is added into the variable-pitch bearing, the graphite plate and the graphite protruding block can better maintain the long-term lubricating effect, and therefore the situation that the variable-pitch bearing is subjected to dry grinding is effectively reduced, and the service life of the variable-pitch bearing is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bearing structure, in particular to a kind of variable pitch bearing structure applied to wind power generation field. BACKGROUND

[0002] Wind turbine generator mainly through blade driven by wind power to drive the rotor of generator, to convert wind energy into electric energy, variable pitch bearing as very core one component on wind turbine, bear the connection hub and blade, carry blade load, transfer blade torque.

[0003] Chinese patent CN219035313U specification discloses a cylindrical roller variable pitch bearing, the utility model discloses a sealing element is installed at the top of rotating part, and then the insert is inserted into the round hole on the rotating part, and then the sealing element is installed at the top of rotating part, the round hole on the rotating part can be sealed by sealing element and insert, so that dust can be prevented from entering, and the service life of the main body is better guaranteed, and the sealing is more airtight.

[0004] But the above-mentioned patent will appear the following problems in the process of using: variable pitch bearing is used for a long time, its internal lubricating oil will be quickly consumed, not timely adding lubricating oil will lead to bearing dry grinding, thereby greatly shorten the service life of variable pitch bearing, and variable pitch bearing is installed at the root of wind turbine blade, i.e. the connecting place of blade and hub, far from ground, manually adding lubricating oil is difficult, and efficiency is low, thereby affecting the normal operation of wind turbine. UTILITY MODEL CONTENTS

[0005] For the above prior art, the technical problem to be solved by the utility model is that variable pitch bearing needs to add lubricating oil after long time use, but variable pitch bearing is located at higher position, and manually adding lubricating oil is low in efficiency, thereby affecting the normal operation of wind turbine.

[0006] In order to solve the above problems, the utility model provides a kind of variable pitch bearing structure, including outer ring, inner ring is rotatably connected with the inner wall of outer ring, the inner wall of outer ring is gouged with two sliding grooves, the outer surface of inner ring is movably embedded with multiple ball bearings, the end of ball bearing away from inner ring is located in the adjacent sliding groove, the inner wall of inner ring is fixedly connected with multiple tooth blocks, the upper end of inner ring is gouged with multiple accommodating grooves, the longitudinal inner wall of accommodating groove is fixedly connected with locating plate, the surface of locating plate is fixedly connected with two compression springs, the end of two compression springs away from locating plate is fixedly connected with mounting plate, the end of mounting plate away from compression spring is equipped with graphite plate, the end of graphite plate away from mounting plate is fixedly connected with two graphite lugs, graphite lug is located in the adjacent sliding groove, multiple graphite lugs and multiple ball bearings are staggered distribution, the upper end of graphite plate is gouged with locating slot, locating rod is equipped in locating slot, locating rod is fixedly connected with mounting plate, the upper end of inner ring is equipped with cover plate, the upper end of cover plate is equipped with multiple screw rods, the lower end of screw rod is in order thread penetration cover plate and inner ring.

[0007] In the above variable pitch bearing structure, graphite plate and graphite lug lubricate the inner wall of outer ring and the inner wall of sliding groove, compared with adding lubricating oil in variable pitch bearing, graphite plate and graphite lug can maintain long-term lubrication effect, thereby effectively reducing the dry grinding of variable pitch bearing, and prolonging the service life of variable pitch bearing.

[0008] As a further improvement of the present application, multiple accommodating grooves and multiple ball bearings are staggered distribution, and multiple accommodating grooves are annularly arrayed around the central axis of inner ring.

[0009] As a further improvement of the present application, graphite plate is arc-shaped, and the end of graphite plate close to outer ring is attached to the inner wall of outer ring.

[0010] As a further improvement of the present application, multiple screw rods and multiple accommodating grooves are staggered distribution, and screw rod does not contact ball bearing.

[0011] As another improvement of the present application, the lower end of outer ring is fixedly connected with L-shaped support plate, the upper end of support plate is fixedly connected with acoustic emission probe, and acoustic emission probe is located directly below inner ring.

[0012] In summary, in actual application process, multiple tooth blocks engage with the root of wind turbine blade, when inner ring rotates, multiple ball bearings rotate in sliding groove, so that variable pitch bearing runs, graphite plate is attached to the inner wall of outer ring, graphite lug is attached to the inner wall of sliding groove, thereby lubricating the connection between outer ring and inner ring and the inner wall of sliding groove, compared with using lubricating oil for lubrication, graphite lubrication can maintain long-term lubrication effect, thereby effectively reducing the dry grinding of variable pitch bearing, and prolonging the service life of variable pitch bearing. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic view of the three-dimensional structure of the first embodiment of the present application;

[0014] Figure 2 is a sectional view of the structure of the first embodiment of the present application;

[0015] Figure 3 is a schematic view of the outer ring structure of the first embodiment of the present application;

[0016] Figure 4 is a schematic view of the inner ring structure of the first embodiment of the present application;

[0017] Figure 5 is a schematic view of the ball mounting of the first embodiment of the present application;

[0018] Figure 6 is a schematic view of the graphite plate structure of the first embodiment of the present application;

[0019] Figure 7 is a front view of the structure of the second embodiment of the present application.

[0020] Explanation of reference numerals in the drawings:

[0021] 1 outer ring, 2 inner ring, 3 sliding slot, 4 ball, 5 tooth block, 6 accommodating groove, 7 positioning plate, 8 compression spring, 9 mounting plate, 10 graphite plate, 11 graphite protrusion, 12 acoustic emission probe, 13 positioning groove, 14 positioning rod, 15 cover plate, 16 screw rod, 17 support plate. DETAILED DESCRIPTION

[0022] The two embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0023] First embodiment:

[0024] Figure 1 , Figure 2 and Figure 3 shows: a variable pitch bearing structure, comprising an outer ring 1, the inner wall of the outer ring 1 is rotatably connected with an inner ring 2, the inner wall of the outer ring 1 is drilled with two sliding slots 3, the outer surface of the inner ring 2 is movably embedded with a plurality of balls 4, the end of the ball 4 away from the inner ring 2 is located in the adjacent sliding slot 3, the inner wall of the inner ring 2 is fixedly connected with a plurality of tooth blocks 5, the tooth blocks 5 facilitate the connection of the variable pitch bearing with the root of the wind turbine blade.

[0025] Figure 4 , Figure 5 and Figure 6The upper end of the inner ring 2 is provided with a plurality of accommodating grooves 6, which are staggered with the plurality of balls 4, and are arranged in a ring array around the central axis of the inner ring 2. The graphite plate 10 is placed in the accommodating groove 6. The longitudinal inner wall of the accommodating groove 6 is fixedly connected with the positioning plate 7. The surface of the positioning plate 7 is fixedly connected with two compression springs 8. The ends of the two compression springs 8 away from the positioning plate 7 are fixedly connected with the mounting plate 9. The end of the mounting plate 9 away from the compression spring 8 is provided with the graphite plate 10. When the graphite plate 10 is installed, the mounting plate 9 is pushed inward, so that the compression spring 8 shrinks inward. Then the positioning rod 14 is clamped into the positioning groove 13 on the graphite plate 10. When the compression spring 8 resets, the graphite plate 10 can be pushed towards the outer ring 1, so that the graphite plate 10 is attached to the outer ring 1. The graphite protrusion 11 is clamped into the sliding groove 3. The end of the graphite plate 10 away from the mounting plate 9 is fixedly connected with two graphite protrusions 11. The graphite protrusions 11 are located in the adjacent sliding grooves 3. The plurality of graphite protrusions 11 are staggered with the plurality of balls 4, which can lubricate the inner wall of the sliding groove 3. The end of the graphite plate 10 close to the mounting plate 9 is provided with the positioning groove 13. The graphite plate 10 is arc-shaped, and the end of the graphite plate 10 close to the outer ring 1 is attached to the inner wall of the outer ring 1, which facilitates the lubrication of the inner wall of the outer ring 1. The positioning groove 13 is provided with the positioning rod 14, which is fixedly connected with the mounting plate 9. The upper end of the inner ring 2 is provided with the cover plate 15. The upper end of the cover plate 15 is provided with a plurality of screws 16. The lower ends of the screws 16 are sequentially screwed through the cover plate 15 and the inner ring 2. The plurality of screws 16 are staggered with the plurality of accommodating grooves 6. The screws 16 are not in contact with the balls 4. The cover plate 15 and the inner ring 2 are fixed by the plurality of screws 16, so as to shield the plurality of graphite plates 10, effectively preventing the graphite plate 10 from falling out during the operation of the variable pitch bearing, thereby effectively improving the stability of the variable pitch bearing during use.

[0026] In use, the plurality of tooth blocks 5 are engaged with the root of the wind turbine blade. When the inner ring 2 rotates, the plurality of balls 4 rotate in the sliding groove 3, so that the variable pitch bearing operates. The graphite plate 10 is attached to the inner wall of the outer ring 1, and the graphite protrusion 11 is attached to the inner wall of the sliding groove 3, thereby lubricating the connection between the outer ring 1 and the inner ring 2 and the inner wall of the sliding groove 3. When the graphite plate 10 is installed, the mounting plate 9 is pushed inward, so that the compression spring 8 shrinks towards the positioning plate 7. Then the positioning rod 14 is clamped into the positioning groove 13 on the graphite plate 10. When the compression spring 8 resets, the graphite plate 10 can be pushed towards the outer ring 1, so that the graphite plate 10 is attached to the outer ring 1. The graphite protrusion 11 is clamped into the sliding groove 3. When the bearing rotates, the graphite protrusion 11 and the graphite plate 10 lubricate the inner wall of the sliding groove 3 and the inner wall of the outer ring 1. Compared with the lubrication method using lubricating oil, graphite lubrication can maintain long-term lubrication effect, thereby effectively reducing the dry grinding of the variable pitch bearing, and prolonging the service life of the variable pitch bearing.

[0027] Second embodiment:

[0028] The embodiment adds a support plate 17 and an acoustic emission probe 12 on the basis of the first embodiment, and the remaining parts remain consistent with the first embodiment.

[0029] Figure 7 It is shown that the lower end of the outer ring 1 is fixedly connected with an L-shaped support plate 17, and the upper end of the support plate 17 is fixedly connected with an acoustic emission probe 12. Those skilled in the art can select a suitable model of the acoustic emission probe 12 according to actual needs, for example: 09383. The acoustic emission probe 12 is located directly below the inner ring 2.

[0030] When the inner ring 2 rotates, the acoustic emission probe 12 can monitor in real time whether a crack appears at the lower end of the inner ring 2, so as to facilitate workers to determine the working state of the variable pitch bearing and facilitate subsequent maintenance of the variable pitch bearing.

[0031] In combination with the current actual needs, the above-mentioned embodiments adopted by the present application are not limited to the scope, and various changes made within the knowledge range of those skilled in the art without departing from the concept of the present application still fall within the protection scope of the present application.

Claims

1. A variable pitch bearing structure comprising an outer ring (1), characterised in that: The inner wall of the outer ring (1) is rotationally connected with an inner ring (2), the inner wall of the outer ring (1) is drilled with two sliding grooves (3), the outer surface of the inner ring (2) is movably embedded with a plurality of balls (4), the end of the ball (4) away from the inner ring (2) is located in the adjacent sliding groove (3), and the inner wall of the inner ring (2) is fixedly connected with a plurality of tooth blocks (5). The upper end of the inner ring (2) is drilled with a plurality of accommodating grooves (6), the longitudinal inner wall of the accommodating groove (6) is fixedly connected with a positioning plate (7), the surface of the positioning plate (7) is fixedly connected with two compression springs (8), the ends of the two compression springs (8) away from the positioning plate (7) are fixedly connected with a mounting plate (9), the end of the mounting plate (9) away from the compression spring (8) is provided with a graphite plate (10), the end of the graphite plate (10) away from the mounting plate (9) is fixedly connected with two graphite protrusions (11), the graphite protrusions (11) are located in the adjacent sliding groove (3), the graphite protrusions (11) and the balls (4) are alternately distributed, the end of the graphite plate (10) close to the mounting plate (9) is drilled with a positioning groove (13), the positioning groove (13) is provided with a positioning rod (14), the positioning rod (14) is fixedly connected with the mounting plate (9), and the upper end of the inner ring (2) is provided with a cover plate (15), the upper end of the cover plate (15) is provided with a plurality of screw rods (16), and the lower ends of the screw rods (16) are sequentially screwed through the cover plate (15) and the inner ring (2).

2. The variable pitch bearing structure of claim 1, wherein: The accommodating grooves (6) and the balls (4) are alternately distributed, and the accommodating grooves (6) are arranged in an annular array around the central axis of the inner ring (2).

3. The variable pitch bearing structure of claim 1, wherein: The graphite plate (10) is arc-shaped, and the end of the graphite plate (10) close to the outer ring (1) is attached to the inner wall of the outer ring (1).

4. The variable pitch bearing structure of claim 1, wherein: The screw rods (16) and the accommodating grooves (6) are alternately distributed, and the screw rods (16) are not in contact with the balls (4).

5. The variable pitch bearing structure of claim 1, wherein: The lower end of the outer ring (1) is fixedly connected with an L-shaped supporting plate (17), the upper end of the supporting plate (17) is fixedly connected with an acoustic emission probe (12), and the acoustic emission probe (12) is located directly below the inner ring (2).

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