A wind power shafting support structure and its clearance grinding method

Abstract

A wind power shafting support structure and its clearance grinding method, which relates to the technical field of wind turbine design. The support structure includes: the first, second, and third bearings. The first, second, and third bearings are all tapered roller bearings. The outer rings of the first, second, and third bearings are arranged in the bearing housing, and the inner rings are arranged on the main shaft. A front inner spacer ring is arranged between the inner rings of the first and second bearings, and a front outer spacer ring is arranged between the outer rings of the first and second bearings. A rear inner spacer ring is arranged between the inner rings of the second and third bearings, and a rear outer spacer ring is arranged between the outer rings of the first and second bearings. The clearance grinding method includes: First, measure the inner ring height, outer ring height, and assembly height of each bearing. Second, measure the height of the front outer spacer ring and the height of the rear outer spacer ring. Third, calculate the height of the front inner spacer ring and the height of the rear inner spacer ring. Applying the present invention can solve the technical problem that the main shaft bearings of the existing wind power main shaft structure are prone to early failure due to the inclination of bearing installation or the improper press-fitting of the clearance.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine design, and particularly to a wind power shafting support structure and a method for grinding the clearance thereof. Background Art

[0002] At present, the wind power main shaft shafting 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 "back-to-back" installation method is adopted to support the shafting. The outer dimensions of the two single-row tapered roller bearings are one large and one small, and they are respectively installed in the upwind direction and the downwind direction.

[0003] The assembly mode of the existing main shaft structure is to install the upwind bearing first, and finally complete the shafting installation by press-fitting the large end face of the inner ring of the downwind bearing through a "lock ring". Since the entire shafting is in a closed state after the press-fitting, the installation state of the bearing cannot be detected, so there are two problems: one is that the installation state of the inner ring of the downwind bearing may be inclined, and the other is that the clearance press-fitting of the bearing is not in place. These two problems will both cause the early failure of the main shaft bearing. Summary of the Invention

[0004] The purpose of the present invention is to provide a wind power shafting support structure and a method for grinding the clearance thereof, which can solve the technical problem that the main shaft bearing of the existing wind power main shaft structure is prone to early failure due to the inclined installation of the bearing or the insufficient press-fitting of the clearance.

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

[0006] A wind power shafting support structure includes a bearing housing, a main shaft, and a bearing group for rotatably arranging the main shaft in the bearing housing.

[0007] The bearing group includes 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 housing, and the inner rings are arranged on the main shaft.

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

[0009] A rear spacer ring for supporting the bearing installation state and matching the bearing clearance is arranged between the second bearing and the third bearing. The rear spacer ring includes a rear inner spacer ring arranged between the inner rings of the second bearing and the third bearing and a rear outer spacer ring arranged between the outer rings of the first bearing and the second bearing.

[0010] Further, the first bearing and the second bearing are arranged on the windward side of the main shaft, the third bearing is arranged on the leeward side of the main shaft, and the first bearing and the second bearing have the same direction, while the third bearing has the opposite direction to the first bearing and the second bearing.

[0011] Further, the first bearing, the second bearing, and the third bearing are all single-row tapered roller bearings.

[0012] Further, the first bearing, the second bearing, and the third bearing all include an outer ring, an inner ring, rollers, and a cage.

[0013] A method for grinding the clearance of a wind power shafting support structure includes the following steps.

[0014] 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.

[0015] Step 2, measure the height B of the front outer spacer ring and measure the height C of the rear outer spacer ring.

[0016] Step 3, according to the data in Step 1 and Step 2, 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.

[0017] Step 4, perform grinding processing on the front inner spacer ring and the rear inner spacer ring according to the height data obtained in Step 4.

[0018] Further, the system clearance S needs to consider the clearance changes caused by factors such as interference amount and materials.

[0019] Further, when measuring, circumferentially evenly distributed measurements are adopted, and at least three positions are measured, and the result is the average value of multiple measurements.

[0020] After adopting the above technical solution, the present invention has the following beneficial effects:

[0021] 1. The support structure in the present invention adopts a three-point support, and two bearings are arranged together to support at the windward side, enhancing the support capacity at the windward side;

[0022] 2. The present invention guarantees the axial distance between adjacent bearings through the spacer ring when assembling the wind power shafting, ensuring that the bearings do not tilt during the installation process by setting a spacer ring between the inner ring and the outer ring of adjacent bearings;

[0023] 3. The present invention accurately controls the bearing clearance through the ground spacer ring, ensuring that the installed bearing clearance is accurately controllable;

[0024] 4. The support structure of the present invention uses bearings of the same specification, with a simple structure and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention (the bearing housing and the main shaft are omitted).

[0026] Figure 2 It is a schematic diagram of the overall structure of the second embodiment of the present invention (the bearing housing and the main shaft are omitted).

[0027] BRIEF 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 OF THE EMBODIMENTS

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the characteristics and performance of a wind power shafting support structure and its clearance grinding method in the present invention will be further described in detail below with reference to the drawings and embodiments.

[0029] Embodiment 1

[0030] As Figure 1 shown, a wind power shafting support structure includes a bearing housing, a main shaft, and a bearing group for rotatably arranging the main shaft in the bearing housing.

[0031] 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 housing, and the inner rings are arranged on the main shaft.

[0032] A front spacer ring for supporting the installation state of the bearings and matching the bearing clearance is arranged between the first bearing 1 and the second bearing 2. The front spacer ring includes a front inner spacer ring 4 arranged between the inner rings of the first bearing 1 and the second bearing 2 and a front outer spacer ring 5 arranged between the outer rings of the first bearing 1 and the second bearing 2.

[0033] A rear spacer ring for supporting the installation state of the bearings and matching the bearing clearance is arranged between the second bearing 2 and the third bearing 3. The rear spacer ring includes a rear inner spacer ring 6 arranged between the inner rings of the second bearing 2 and the third bearing 3 and a rear outer spacer ring 7 arranged between the outer rings of the first bearing 1 and the second bearing 2.

[0034] The first bearing 1 and the second bearing 2 are arranged on the windward side of the main shaft, the third bearing 3 is arranged on the leeward side of the main shaft, and the first bearing 1 and the second bearing 2 have the same direction, while the third bearing 3 has the opposite direction to the first bearing 1 and the second bearing 2.

[0035] The first bearing 1, the second bearing 2, and the third bearing 3 are all single-row tapered roller bearings.

[0036] The first bearing 1, the second bearing 2, and the third bearing 3 all include an outer ring, an inner ring, rollers, and a cage.

[0037] In specific implementation, a wind power shafting 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.

[0038] The first bearing 1 is a single-row tapered roller bearing, including 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 inside the bearing housing, for supporting the shafting.

[0039] The second bearing 2 is a single-row tapered roller bearing, including 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 inside the bearing housing, for supporting the shafting.

[0040] The third bearing 3 is a single-row tapered roller bearing, including 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 inside the bearing housing, for supporting the shafting.

[0041] The front inner spacer ring 4 is installed between the inner rings of the first bearing 1 and the second bearing 2, for supporting the installation state of the bearings and matching the bearing clearance.

[0042] The front outer spacer ring 5 is installed between the outer rings of the first bearing 1 and the second bearing 2, for supporting the installation state of the bearings.

[0043] The rear inner spacer ring 6 is installed between the inner rings of the second bearing 2 and the third bearing 3, for supporting the installation state of the bearings and matching the bearing clearance.

[0044] The rear outer spacer ring 7 is installed between the outer rings of the second bearing 2 and the third bearing 3, for supporting the installation state of the bearings.

[0045] By arranging an inner spacer ring between the inner rings of adjacent bearings and an outer spacer ring between the outer rings, using the spacer ring to limit the axial distance between the inner or outer rings of adjacent bearings, during assembly and operation, it can effectively prevent the bearings from tilting.

[0046] Embodiment 2

[0047] A method for grinding the clearance of a wind power shafting support structure includes the following steps.

[0048] Step 1, measure the inner ring height Y1, the outer ring height X1, and the assembly height H1 of the first bearing 1, measure the inner ring height Y2, the outer ring height X2, and the assembly height H2 of the second bearing 2, and measure the inner ring height Y3, the outer ring height X3, and the assembly height H3 of the third bearing 3.

[0049] Step 2: Measure the height B of the front outer spacer ring 5 and the height C of the rear outer spacer ring 7.

[0050] During measurement, circumferentially uniformly distributed measurement is adopted, and at least three positions are measured. The result is the average value of multiple measurements.

[0051] Step 3: According to the data in Steps 1 and 2, the height A of the front inner spacer ring 4 can be obtained as A = H1 + B + X2 - H2 - Y1, and the height D 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 consider the clearance changes caused by factors such as interference and materials.

[0052] Step 4: Perform matching grinding on the front inner spacer ring 4 and the rear inner spacer ring 6 according to the height data obtained in Step 4.

[0053] During 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 respectively.

[0054] 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 circumferentially uniformly distributed measurements at least at three positions.

[0055] Given that the system clearance is 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.

[0056] During processing, matching grinding is performed on the front inner spacer ring 4 and the rear inner spacer ring 6 according to the height data calculated above.

[0057] 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, enabling the bearing to maintain a suitable working state.

[0058] It should be noted that the parts not described in detail in this solution are all prior arts. The above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention all 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. 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). 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), the second bearing (2) and the third bearing (3) are all single-row tapered roller bearings.

3. A wind turbine shaft support structure according to claim 2, 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.

4. 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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