Wind power shaft system supporting structure and clearance match grinding method thereof

Abstract

The invention discloses a wind power shafting supporting structure and a clearance match grinding method thereof, and relates to the technical field of wind turbine generator design, the supporting structure comprises a first bearing, a second bearing and a third bearing, the first bearing, the second bearing and the third bearing are all tapered roller bearings, outer rings of the first bearing, the second bearing and the third bearing are arranged in a bearing seat, and inner rings of the first bearing, the second bearing and the third bearing are arranged on a main shaft. A front inner spacer ring is arranged between inner rings of the first bearing and the second bearing, and a front outer spacer ring is arranged between outer rings of the first bearing and the second bearing. A rear inner spacer ring is arranged between the inner rings of the second bearing and the third bearing; a rear outer spacer ring is arranged between the outer rings of the first bearing and the second bearing. The clearance match grinding method comprises the following steps: 1, measuring the inner ring height, the outer ring height and the assembly height of each bearing; 2, measuring the height of the front outer spacer ring and the height of the rear outer spacer ring; and 3, calculating the height of the front inner spacer ring and the height of the rear inner spacer ring. The wind power main shaft structure can solve the technical problem that the main shaft bearing is prone to early failure due to the fact that the bearing is installed obliquely or clearance press-fit is not in place in an existing wind power main shaft structure.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine design, in particular to a wind turbine shaft support structure and a clearance grinding method thereof. Background Art

[0002] At present, the main shaft system of wind turbines adopts a two-point support method, that is, a single-row tapered roller bearing is used at each end of the main shaft, and the shaft system is supported in a "back-to-back" installation method. The two single-row tapered roller bearings have a large and a small size, and are installed in the upwind direction and the downwind direction respectively.

[0003] The existing main shaft assembly mode is to install the upwind bearing first, and finally complete the shaft system installation by pressing the large end face of the inner ring of the downwind bearing with a "locking ring". Since the entire shaft system is in a closed state after the press-fitting is completed, the bearing installation status cannot be detected, so there are two problems: one is that the installation status of the downwind bearing inner ring may be tilted, and the other is that the bearing clearance is not pressed into place. Both problems will cause the spindle bearing to fail early. Summary of the invention

[0004] The purpose of the present invention is to provide a wind turbine shaft support structure and a clearance grinding method thereof, which can solve the technical problem that the main shaft bearings of the existing wind turbine main shaft structure are prone to early failure due to tilted bearing installation or inadequate clearance press fitting.

[0005] In order to achieve the above object, the present invention adopts the following technical solution.

[0006] A wind power shaft system support structure comprises a bearing seat, a main shaft and a bearing group arranged in the bearing seat for rotating the main shaft.

[0007] The bearing group comprises a first bearing, a second bearing and a third bearing. The first bearing, the second bearing and the third bearing are all tapered roller bearings. The outer rings of the first bearing, the second bearing and the third bearing are arranged in the bearing seat, and the inner rings are arranged on the main shaft.

[0008] A front spacer ring is provided between the first bearing and the second bearing for supporting the bearing installation state and matching the bearing clearance. The front spacer ring includes a front inner spacer ring provided between the first bearing and the second bearing inner ring and a front outer spacer ring provided between the first bearing and the second bearing outer ring. A rear spacer ring is provided between the second bearing and the third bearing for supporting the bearing installation state and matching the bearing clearance. The rear spacer ring includes a rear inner spacer ring provided between the second bearing and the inner ring of the third bearing and a rear outer spacer ring provided between the outer rings of the first bearing and the second bearing.

[0009] Furthermore, the first bearing and the second bearing are arranged on the upwind side of the main shaft, and the third bearing is arranged on the downwind side of the main shaft. The first bearing and the second bearing have the same direction, and the third bearing has an opposite direction to the first bearing and the second bearing.

[0010] Furthermore, the first bearing, the second bearing and the third bearing are all single-row tapered roller bearings.

[0011] Furthermore, the first bearing, the second bearing and the third bearing each include an outer ring, an inner ring, rollers and a retaining frame.

[0012] A clearance grinding method for a wind power shaft support structure comprises the following steps.

[0013] Step 1: measure the inner ring height Y1, outer ring height X1 and assembly height H1 of the first bearing, measure the inner ring height Y2, outer ring height X2 and assembly height H2 of the second bearing, and measure the inner ring height Y3, outer ring height X3 and assembly height H3 of the third bearing.

[0014] Step 2: Measure the height B of the front outer spacer ring and the height C of the rear outer spacer ring.

[0015] Step three, based on the data from steps one and two, the height of the front inner spacer ring A=H1+B+X2-H2-Y1, and the height of the rear inner spacer ring D=H2+H3+C-Y2-Y3-S, where S is the system clearance.

[0016] Step 4: Grind the front inner spacer ring and the rear inner spacer ring according to the height data obtained in step 4.

[0017] Furthermore, the system clearance S needs to take into account the clearance changes caused by factors such as interference and material.

[0018] Furthermore, the measurement is performed uniformly around the circumference, and at least three positions are measured, and the result is an average value of multiple measurements.

[0019] After adopting the above technical solution, the present invention has the following beneficial effects: 1. The support structure of the present invention adopts three-point support, and two bearings are provided at the upwind side for joint support, thereby enhancing the support capacity at the upwind side; 2. The present invention arranges a spacer ring between the inner ring and the outer ring of adjacent bearings. When the wind turbine shaft system is assembled, the spacer ring is used to ensure the axial spacing between adjacent bearings, thereby ensuring that the bearings do not tilt during the installation process; 3. The present invention uses a grinding spacer ring to accurately control the bearing clearance, thereby ensuring that the bearing installation clearance is accurately controllable; 4. The supporting structure of the present invention adopts bearings of the same specifications, has a simple structure and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention (the bearing seat and the main shaft are omitted).

[0021] Figure 2 It is a schematic diagram of the overall structure of the second embodiment of the present invention (the bearing seat and the main shaft are omitted).

[0022] Description of the drawings: 1. first bearing, 2. second bearing, 3. third bearing, 4. front inner spacer ring, 5. front outer spacer ring, 6. rear inner spacer ring, 7. rear outer spacer ring. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the features and performances of a wind turbine shaft support structure and a clearance matching method thereof in the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] Embodiment 1 like Figure 1 As shown, a wind turbine shaft system support structure includes a bearing seat, a main shaft and a bearing group arranged in the bearing seat for rotating the main shaft.

[0025] The bearing group includes a first bearing 1, a second bearing 2, and a third bearing 3. The first bearing 1, the second bearing 2, and the third bearing 3 are all tapered roller bearings. The outer rings of the first bearing 1, the second bearing 2, and the third bearing 3 are arranged in the bearing seat, and the inner rings are arranged on the main shaft.

[0026] A front spacer ring is provided between the first bearing 1 and the second bearing 2 for supporting the bearing installation state and matching the bearing clearance. The front spacer ring includes a front inner spacer ring 4 provided between the inner rings of the first bearing 1 and the second bearing 2 and a front outer spacer ring 5 provided between the outer rings of the first bearing 1 and the second bearing 2. A rear spacer ring is provided between the second bearing 2 and the third bearing 3 for supporting the bearing installation state and matching the bearing clearance. The rear spacer ring includes a rear inner spacer ring 6 provided between the inner rings of the second bearing 2 and the third bearing 3 and a rear outer spacer ring 7 provided between the outer rings of the first bearing 1 and the second bearing 2.

[0027] The first bearing 1 and the second bearing 2 are arranged on the upwind side of the main shaft, and the third bearing 3 is arranged on the downwind side of the main shaft. The first bearing 1 and the second bearing 2 are in the same direction, and the third bearing 3 is in the opposite direction to the first bearing 1 and the second bearing 2.

[0028] The first bearing 1, the second bearing 2 and the third bearing 3 are all single-row tapered roller bearings.

[0029] The first bearing 1, the second bearing 2 and the third bearing 3 each include an outer ring, an inner ring, rollers and a cage.

[0030] In specific implementation, a wind turbine shaft support structure of the present invention is composed of a first bearing 1, a second bearing 2, a third bearing 3, a front inner spacer ring 4, a front outer spacer ring 5, a rear inner spacer ring 6, and a rear outer spacer ring 7.

[0031] The first bearing 1 is a single-row tapered roller bearing, comprising an inner ring, an outer ring, rollers, and a cage. The inner ring is mounted on the main shaft, and the outer ring is mounted in the bearing seat to support the shaft system.

[0032] The second bearing 2 is a single-row tapered roller bearing, which includes an inner ring, an outer ring, rollers, and a cage. The inner ring is installed on the main shaft, and the outer ring is installed in the bearing seat to support the shaft system.

[0033] The third bearing 3 is a single-row tapered roller bearing, which includes an inner ring, an outer ring, rollers, and a cage. The inner ring is installed on the main shaft, and the outer ring is installed in the bearing seat to support the shaft system.

[0034] The front inner spacer ring 4 is installed between the inner ring of the first bearing 1 and the inner ring of the second bearing 2, and is used to support the bearing installation state and match the bearing clearance.

[0035] The front outer spacer ring 5 is installed between the outer ring of the first bearing 1 and the outer ring of the second bearing 2 to support the installation state of the bearing.

[0036] The rear inner spacer ring 6 is installed between the inner ring of the second bearing 2 and the inner ring of the third bearing 3 to support the bearing installation state and to match the bearing clearance.

[0037] The rear outer spacer ring 7 is installed between the outer ring of the second bearing 2 and the outer ring of the third bearing 3 to support the bearing installation state.

[0038] By arranging inner spacer rings between the inner rings of adjacent bearings and outer spacer rings between the outer rings, the spacer rings are used to limit the axial spacing between the adjacent inner rings or outer rings of the bearings, which can effectively prevent the bearings from tilting during assembly and operation.

[0039] Embodiment 2 A clearance grinding method for a wind power shaft support structure comprises the following steps.

[0040] Step 1: measure the inner ring height Y1, outer ring height X1 and assembly height H1 of the first bearing 1, measure the inner ring height Y2, outer ring height X2 and assembly height H2 of the second bearing 2, and measure the inner ring height Y3, outer ring height X3 and assembly height H3 of the third bearing 3.

[0041] Step 2: measure the height B of the front outer spacer ring 5 and the height C of the rear outer spacer ring 7.

[0042] The measurement is uniformly distributed around the circle and at least three positions are measured. The result is the average of multiple measurements.

[0043] Step three, based on the data of steps one and two, the height of the front inner spacer ring 4 is A=H1+B+X2-H2-Y1, and the height of the rear inner spacer ring 6 is D=H2+H3+C-Y2-Y3-S, where S is the system clearance. The system clearance S needs to take into account the clearance changes caused by factors such as interference and material.

[0044] Step 4: Grind the front inner spacer ring 4 and the rear inner spacer ring 6 according to the height data obtained in step 4.

[0045] During the specific implementation, first measure the inner ring height Y1, outer ring height X1, and assembly height H1 of the first bearing 1; the inner ring height Y2, outer ring height X2, and assembly height H2 of the second bearing 2; and the inner ring height Y3, outer ring height X3, and assembly height H3 of the third bearing 3.

[0046] The height of the front outer spacer ring 5 is measured as B, and the height of the rear outer spacer ring 7 is measured as C. All measurement results are the average values ​​of at least three positions evenly distributed around the circumference.

[0047] The system clearance is known to be S. Then the height of the front inner spacer ring 4 is A=H1+B+X2-H2-Y1, and the height of the rear inner spacer ring 6 is D=H2+H3+C-Y2-Y3-S.

[0048] During processing, the front inner spacer ring 4 and the rear inner spacer ring 6 are ground according to the height data obtained by the above calculation.

[0049] By precisely controlling the axial lengths of the front inner spacer ring 4 and the rear inner spacer ring 6, the clearance of the bearing can be precisely controlled to keep the bearing in a suitable working state.

[0050] It should be noted that the parts not described in detail in this scheme are all prior art, and the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A wind turbine shaft support structure, comprising a bearing seat, a main shaft and a bearing assembly for rotating the main shaft in the bearing seat, characterized in that: The bearing group comprises a first bearing (1), a second bearing (2), and a third bearing (3). The first bearing (1), the second bearing (2), and the third bearing (3) are all tapered roller bearings. The outer rings of the first bearing (1), the second bearing (2), and the third bearing (3) are arranged in a bearing seat, and the inner rings are arranged on the main shaft. A front spacer ring is provided between the first bearing (1) and the second bearing (2) for supporting the bearing installation state and providing bearing clearance. The front spacer ring comprises a front inner spacer ring (4) provided between the inner rings of the first bearing (1) and the second bearing (2) and a front outer spacer ring (5) provided between the outer rings of the first bearing (1) and the second bearing (2). A rear spacer ring is provided between the second bearing (2) and the third bearing (3) for supporting the bearing installation state and providing bearing clearance. The rear spacer ring comprises a rear inner spacer ring (6) provided between the inner rings of the second bearing (2) and the third bearing (3) and a rear outer spacer ring (7) provided between the outer rings of the first bearing (1) and the second bearing (2).

2. A wind turbine shaft support structure according to claim 1, characterized in that: The first bearing (1) and the second bearing (2) are arranged on the upwind side of the main shaft, and the third bearing (3) is arranged on the downwind side of the main shaft. The first bearing (1) and the second bearing (2) are in the same direction, and the third bearing (3) is in the opposite direction to the first bearing (1) and the second bearing (2).

3. A wind turbine shaft support structure according to claim 1, characterized in that: The first bearing (1), the second bearing (2) and the third bearing (3) are all single-row tapered roller bearings.

4. A wind turbine shaft support structure according to claim 3, characterized in that: The first bearing (1), the second bearing (2) and the third bearing (3) each comprise an outer ring, an inner ring, a roller and a cage.

5. A clearance grinding method for a wind turbine shaft support structure according to claim 1, characterized in that: The following steps are included: Step 1: measuring the inner ring height Y1, outer ring height X1 and assembly height H1 of the first bearing (1), measuring the inner ring height Y2, outer ring height X2 and assembly height H2 of the second bearing (2), and measuring the inner ring height Y3, outer ring height X3 and assembly height H3 of the third bearing (3). Step 2: Measure the height B of the front outer spacer ring (5) and the height C of the rear outer spacer ring (7). Step 3: Based on the data from steps 1 and 2, the height of the front inner spacer ring (4) is A=H1+B+X2-H2-Y1, and the height of the rear inner spacer ring (6) is D=H2+H3+C-Y2-Y3-S, where S is the system clearance. Step 4: Grinding the front inner spacer ring (4) and the rear inner spacer ring (6) according to the height data obtained in step 4.

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