Installed on the impeller locking disc and main shaft flange of the wind turbine generator set

Abstract

The application provides a blade locking disc and a main shaft flange of a wind turbine. The blade locking disc comprises: a plurality of blade locking pieces arranged at intervals along the circumference of a blade of the wind turbine; each of the blade locking pieces is provided with a plurality of pin shaft holes for accommodating a plurality of locking pins; and the plurality of locking pins are used to lock the corresponding blade locking pieces in a preset orientation through the corresponding pin shaft holes. The blade locking disc and the main shaft flange are reasonable in design, simple in structure, reliable in connection and locking, reduce the self-weight of the blade locking disc, and reduce the machining cost.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generator set design, and in particular to an impeller locking disc and a main shaft flange arranged in a wind turbine generator set. Background Art

[0002] As a representative of green energy, wind energy is inexhaustible. To harness this renewable energy source, investment in wind power generation equipment has continued to increase for years. After decades of development, wind power technology has matured.

[0003] The impeller locking device allows the unit to be safely stopped when the unit is being hoisted, repaired, or parts are replaced. During routine inspections and maintenance of the unit, especially when personnel need to enter the hub to work, the impeller locking device keeps the impeller stationary, ensuring the personal safety of personnel.

[0004] At present, the impeller locking disk, which is the main component of the impeller locking device, is large in size and heavy, and it is necessary to reduce its weight. Summary of the Invention

[0005] In response to the above problems, the present application provides an impeller locking disc and a main shaft flange provided in a wind turbine generator set to solve one or more of the problems of the currently used impeller locking disc, such as large size and heavy weight.

[0006] In a first aspect, the present application provides an impeller locking disc provided in a wind turbine generator set, comprising:

[0007] A plurality of impeller locking plates 1 are arranged at intervals along the circumference of the impeller of the unit;

[0008] Each of the impeller locking pieces 1 is provided with a plurality of pin holes 12 for accommodating a plurality of locking pins;

[0009] The plurality of locking pins are used to lock the corresponding impeller locking piece 1 in a preset position through the corresponding plurality of pin holes 12 .

[0010] Furthermore, the impeller locking plate further comprises:

[0011] Multiple sets of pin sleeves 2;

[0012] Each of the impeller locking pieces 1 is further provided with a plurality of pin sleeve holes 11;

[0013] Each set of pin sleeves 2 is used to be correspondingly arranged in the multiple pin sleeve holes 11 of an impeller locking plate 1, and is connected to the main shaft flange 3 through the flange hole 31 of the main shaft flange 3, so that the impeller locking plate 1 is connected to the main shaft flange 3.

[0014] Furthermore, the pin sleeve 2 is provided with an inner hole 21 for accommodating the first connecting member;

[0015] Each of the first connecting pieces is used to pass through the inner hole 21 and the flange hole 31 of the main shaft flange 3 , so that the impeller locking piece 1 is connected to the main shaft flange 3 .

[0016] Furthermore, each of the impeller locking pieces 1 is further provided with a plurality of coupling holes 13, and the plurality of coupling holes 13 are used to accommodate a plurality of second coupling members;

[0017] Each of the second connecting pieces is used to pass through the corresponding connecting hole 13 and the mounting hole 32 of the main shaft flange 3 , so that the impeller locking piece 1 is connected to the main shaft flange 3 .

[0018] Furthermore, the number of the pin holes 12 is 2.

[0019] Furthermore, the number of the pin sleeves 2 is 3, and the material of the pin sleeves 2 is 42CrMo.

[0020] Furthermore, the impeller locking piece 1 comprises an annular arc body with a preset center angle and a preset thickness.

[0021] Furthermore, the impeller locking piece 1 is provided with weight-reducing fillets 14 at both ends of its outer edge.

[0022] Furthermore, the impeller locking piece 1 is provided with weight-reducing recesses 15 at both ends of the inner edge.

[0023] In a second aspect, the present application provides a main shaft flange for mounting the impeller locking disk as described in the first aspect, wherein the main shaft flange is disposed at the tail end of the impeller of the fan;

[0024] The main shaft flange is provided with a plurality of impeller coupling holes, which are arranged at intervals along the circumference of the main shaft flange;

[0025] Each set of impeller coupling holes includes a plurality of flange holes 31;

[0026] The flange hole 31 includes a first hole and a second hole that are adjacent to each other in sequence, and the first hole and the second hole have different hole diameters.

[0027] The impeller locking plate and main shaft flange provided by the present invention are arranged on the wind turbine generator set, have a reasonable design, simple structure, reliable connection, and reliable locking. They can withstand the load requirements under the maintenance conditions of the unit and the conditions of following the rotation of the impeller, reduce the dead weight of the impeller locking plate, and reduce the machining cost, which is conducive to reducing the procurement cost of the impeller locking plate.

[0028] The present invention will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 Schematic diagram of a separation state of an impeller locking disc provided in a wind turbine generator set according to an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of the connection state of the impeller locking disc provided in the wind turbine generator set according to an embodiment of the present invention;

[0032] Figure 3 A partial cross-sectional view of the connection between the impeller locking disc and the main shaft flange provided in a wind turbine generator set according to an embodiment of the present invention;

[0033] Figure 4 For installation of the embodiment of the present invention Figure 1 、 Figure 2 、 Figure 4 A partial schematic diagram of the main shaft flange of the middle impeller locking disk;

[0034] Figure 5 This is a schematic diagram of an impeller locking disc provided in a wind turbine generator set after being connected to a main shaft flange according to an embodiment of the present invention;

[0035] Figure 6A A stress cloud diagram of a locking plate of an impeller locking disk of a wind turbine generator set when locked according to an embodiment of the present invention;

[0036] Figure 6B The strain cloud diagram of the locking plate of the impeller locking disk of the wind turbine generator set when locked is shown in the embodiment of the present invention; wherein,

[0037] 1. Impeller locking plate; 11. Pin sleeve hole; 12. Pin shaft hole; 13. Connecting hole; 14. Weight reduction fillet; 15. Weight reduction recess; 2. Pin sleeve; 21. Inner hole; 3. Spindle flange; 31. Flange hole; 32. Mounting hole. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0039] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments, but which can be understood as a same or different subset of all possible embodiments, and which can be combined with each other, without conflict, in the following description.

[0040] In the following description, the terms "first\second\third" and the like are used to distinguish similar objects, and do not represent a specific order or sequence, and it can be understood that the specific order or sequence can be interchanged, as long as it does not conflict, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application belongs. The terms used herein are only for the purpose of describing the embodiments of the application, and are not intended to limit the application.

[0042] Before the specific embodiments of the application are further described in detail, the terms and phrases involved in the embodiments of the application and their corresponding uses, roles, functions, etc. in the application are described, and the terms and phrases involved in the embodiments of the application are applicable to the following explanations.

[0043] Germanischer Lloyd Rules, GL Rules, GL Rules, hereinafter referred to as GL Rules.

[0044] The process of wind power generation is roughly as follows: the kinetic energy of wind is converted into mechanical energy of impeller, and the mechanical energy from the impeller is converted into electrical energy. A wind turbine generally consists of an impeller, a nacelle, a tower, etc. The nacelle is installed on top of the tower, the impeller is located outside the nacelle, and the generator is located inside the nacelle. The impeller mainly includes blades and a hub for fixing the blades. Accordingly, the wind in the natural environment drives the impeller and the main shaft at the end of the impeller to rotate, and the rotational speed is increased by a two-stage or three-stage gear box (usually a speed increaser) installed in the nacelle, and then transmitted to the generator to drive the generator to generate electricity.

[0045] The center line around which the impeller rotates is usually defined as the x-axis of the impeller, and any plane perpendicular to the x-axis is the impeller plane. The load in the direction of rotation of the impeller is denoted as M x Load.

[0046] During routine maintenance, inspection, installation, and commissioning of wind turbines, the impellers must be in a stationary, locked state. This is especially true when maintenance personnel need to enter the hub to work. To protect their safety, the hub must not rotate suddenly. Furthermore, the impeller should also be kept stationary during extended periods of downtime. Although the blades are theoretically feathered during downtime, the instability of wind direction inevitably causes slight rotation of the impeller, which can cause vibrations in the drive chain and nacelle, impacting the service life of components such as the blades, hub, bearings, and gears. Therefore, wind turbines are equipped with an impeller locking device that locks the impeller in a stationary, locked state. Typically, the impeller locking disc in the impeller locking device is located between the hub and the nacelle.

[0047] Under the current overall environment of the wind power market, "cost reduction" has become a common problem faced by all complete machine manufacturers. If complete machine manufacturers want to ensure stable profits, they must reduce the purchase price of various components in the industrial chain.

[0048] Currently, the primary material for a full-circle impeller locking disc is Q355E steel plate, weighing approximately 1.3 tons. Including processing costs and other expenses, the total cost is approximately 45,000 yuan. Meanwhile, raw material costs continue to rise. For example, the price of Q355E steel plate rose from 4,500 yuan / ton in 2019 to 7,800 yuan / ton in 2021, and supply is tight. To meet the demand for cost reduction in wind turbines, it is necessary to optimize the design of the impeller locking disc. For example, optimizing the structure, reducing the blanking weight, and simplifying the processing difficulty can reduce material and processing costs, thereby lowering the procurement cost of the impeller locking disc.

[0049] The present invention provides an impeller locking disk arranged at a wind turbine generator set, which has a reasonable design, simple structure, reliable connection, and reliable locking. It can withstand the load requirements under the maintenance conditions of the set and the conditions of following the rotation of the impeller, reduces the dead weight of the impeller locking disk, and reduces the machining cost, which is conducive to reducing the procurement cost of the impeller locking disk.

[0050] like Figure 1 、 Figure 2 As shown, the impeller locking plate of the wind turbine generator set according to the embodiment of the present invention includes:

[0051] A plurality of impeller locking plates 1 are arranged at intervals along the circumference of the impeller of the unit;

[0052] Each of the impeller locking pieces 1 is provided with a plurality of pin holes 12 for accommodating a plurality of locking pins;

[0053] The plurality of locking pins are used to lock the corresponding impeller locking piece 1 in a preset position through the corresponding plurality of pin holes 12 .

[0054] In some embodiments, multiple impeller locking plates 1 are spaced apart along the circumference of the impeller of the unit, for example, corresponding one-to-one with the blades of the impeller of the unit. For example, when viewed along the axis of rotation of the impeller, one locking plate 1 corresponds to one blade and is located at the same position on the impeller plane. In this case, multiple locking pins are respectively passed through the multiple pin holes 12 of the impeller locking plate 1 to lock the impeller locking plate 1, the hub, and the impeller to the frame or nacelle, thereby locking the corresponding blades in a predetermined position.

[0055] In some embodiments, when the load requirements in the locked state are met, the impeller locking plate 1 is provided with two pin holes 12 on its outer side, and accordingly, two locking pins need to be configured. The pin holes 12 can be cylindrical holes or conical holes, which will not be described in detail.

[0056] In some embodiments, a bushing can be placed in the pin hole to reduce wear. When the relatively low-hardness, wear-resistant bushing wears to a certain extent, the worn bushing can be easily removed and replaced, avoiding the cost and time associated with replacing the impeller locking plate or repositioning the pin hole and machining the additional hole.

[0057] When the target blade is in the feathering state, the locking pins pass through the corresponding pin holes 12, preventing the impeller locking plate 1 from rotating, thereby locking the position of the impeller relative to the nacelle and locking the corresponding target blade in a preset orientation. Typically, the locking pins are relatively heavy, such as 40 kg.

[0058] like Figure 1 、 Figure 2 and Figure 3 As shown, the impeller locking plate further includes:

[0059] Multiple sets of pin sleeves 2;

[0060] Each of the impeller locking pieces 1 is further provided with a plurality of pin sleeve holes 11;

[0061] Each set of pin sleeves 2 is used to be correspondingly arranged in the multiple pin sleeve holes 11 of an impeller locking plate 1, and is connected to the main shaft flange 3 through the flange hole 31 of the main shaft flange 3, so that the impeller locking plate 1 is connected to the main shaft flange 3.

[0062] In some embodiments, each impeller locking plate 1 is provided with multiple pin sleeve holes 11 along its circumference. Multiple pin sleeves 2 are then passed through flange holes 31 of the main shaft flange 3 to couple the impeller locking plate 1 to the main shaft flange 3. This allows the impeller locking plate 1 to rotate with the impeller when the blades drive the impeller. In this case, multiple pin sleeves are passed through the multiple pin sleeve holes 11 of the impeller locking plate 1, securing the impeller locking plate 1 to the hub and impeller via the main shaft flange 3, with their orientation corresponding to the orientation of the blades.

[0063] In some embodiments, when the load requirement in the following impeller rotation state is met, three pin sleeve holes 11 are arranged on the inner side of the impeller locking piece 1, and the distance from the center line of the pin sleeve hole to the rotation center line O of the impeller is denoted as L1. Correspondingly, three pin sleeves 2 need to be configured.

[0064] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 5 , the pin sleeve 2 is a hollow sleeve. The material of the pin sleeve is 42CrMo, and the shear strength is 600 MPa. Alloy structural steel 42CrMo has good mechanical properties and machinability, and has two types of blanks, plate and round bar, and its comprehensive performance is better than that of 40Cr.

[0065] The following describes the torque load of the preset power level unit and its maintenance working condition, designs the number and size parameters of the group of pin sleeves arranged in the impeller locking piece, such as large diameter, small diameter, height, etc., and carries out the steps of static strength checking for the group of pin sleeves.

[0066] According to the requirements of the Lloyd's specification, the maintenance working condition only passes M x Load (torque load around the direction of impeller rotation) size, and is the most adverse working condition. The torque load of the maintenance working condition extracted by a certain 4MW wind field site load is 3500kNm.

[0067] The calculation method for checking the static strength of the pin sleeve is as follows. According to the torque load M x =3500kNm in the maintenance working condition, design to set a group of three pin sleeves in sequence on each impeller locking piece, the large diameter D of the pin sleeve is 78mm, and the small diameter d of the pin sleeve is 43.5mm. The material of the pin sleeve is selected as 42CrMo, and the allowable shear strength σ 剪切 of the pin sleeve is 600MPa. The distance L1 from the center line of each pin sleeve to the rotation center line of the impeller is designed as 930mm, and the shear load σ a of the group of pin sleeves under the maintenance working condition is: σ a =F1 / A1=(M x / L1) / πD 2 -d 2 / 4=(3500 / 930) / π×78 2 -43.5 2 / 4=1143.1MPa, wherein A1 is the effective cross-sectional area of the pin sleeve.

[0068] The shear load is evenly distributed to the three pin sleeves in sequence, so σ a / 3=381MPa<σ 剪切=600MPa. In this way, the shear load borne by a single pin sleeve is less than the allowable shear strength, so the design of this group of pin sleeves meets the use requirements.

[0069] For units of other power levels and the torque loads under their maintenance conditions, the above steps can be referred to to similarly design the number of pin sleeves in groups set in the impeller locking plates and the dimensional parameters of the pin sleeves, such as major diameter, minor diameter, height, etc., and perform static strength verification on the pin sleeves in groups.

[0070] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the pin sleeve 2 is provided with an inner hole 21 for accommodating the first connecting member;

[0071] Each of the first connecting pieces is used to pass through the inner hole 21 and the flange hole 31 of the main shaft flange 3 , so that the impeller locking piece 1 is connected to the main shaft flange 3 .

[0072] As described above, the number of the first coupling members and the inner holes 21 is the same as the number of the pin sleeves 2. The first coupling member passing through the inner hole 21 of the pin sleeve 2 is beneficial for improving the connection strength between the impeller locking piece 1 and the main shaft flange 3.

[0073] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, each of the impeller locking pieces 1 is further provided with a plurality of coupling holes 13, and the plurality of coupling holes 13 are used to accommodate a plurality of second coupling members;

[0074] Each of the second connecting pieces is used to pass through the corresponding connecting hole 13 and the mounting hole 32 of the main shaft flange 3 , so that the impeller locking piece 1 is connected to the main shaft flange 3 .

[0075] As described above, the coupling holes 13 may include two groups. The distance between the centerline of the first group of coupling holes 13 and the impeller's rotational centerline is the same as the distance between the centerline of the aforementioned pin sleeve holes 11 and the impeller's rotational centerline. The second group of coupling holes 13 is located outside the first group of coupling holes 13 and is arranged in a staggered manner with the first group of coupling holes 13. The distance between the centerline of the second group of coupling holes 13 and the impeller's rotational centerline is greater than the distance between the centerline of the aforementioned pin sleeve holes 11 and the impeller's rotational centerline O. The second coupling member through the coupling holes 13 helps to improve the connection strength between the impeller locking plate 1 and the main shaft flange 3.

[0076] In some embodiments, when the load requirement of the impeller is met when the impeller is locked in a stationary state, the number of the impeller locking pieces 1 is 3. Figure 1 、 Figure 2 、 Figure 5 As shown, the impeller locking piece 1 comprises an annular arc body having a preset center angle β and a preset thickness. The sum of the center angles β of all impeller locking pieces 1 is no greater than 180 degrees, 200 degrees, or 360 degrees. The distance from the inner edge of the annular arc body to the impeller rotation centerline O, i.e., the inner diameter, is R11. The distance from the outer edge of the annular arc body to the impeller rotation centerline O, i.e., the outer diameter, is R12. The thickness is h.

[0077] For a single impeller locking plate with the aforementioned shape and size parameters, simulation software is used to establish a force model of the impeller locking plate when it is in a locked state, and a structural strength simulation analysis is performed. For example, von Mises stress (Von Mises) is used to determine whether the impeller locking plate will yield and fail during maintenance conditions.

[0078] The material of the impeller locking piece is low alloy high strength steel Q355E, and its allowable yield strength σ 屈 The ultimate stress is 315 MPa and the impact temperature is -40 ° C. According to the requirements of the GL specification on ultimate stress, the material coefficient is determined to be 1.1, so the ultimate stress σ b 315 / 1.1=286MPa. After finite element calculation, Figure 6A As shown in the figure, within the entire stress range, the maximum Mises stress (Mises) of the impeller locking plate is 478.54 MPa, while in some areas the stress value exceeds the ultimate stress of 268 MPa. Since the torque load acting on the pin sleeve and locking pin is pure pressure for the pin shaft hole and pin sleeve hole of the impeller locking plate, according to the stress requirements of the GL specification, the elastic-plastic deformation strain of the impeller locking plate is less than 1% to be qualified. Figure 6B As shown, in the entire strain region, the maximum strain of the impeller locking piece is 0.0040985, that is, about 0.4%, 0.4% < 1%, so the elastic-plastic deformation strain of the impeller locking piece is qualified.

[0079] For units of other power levels and the torque loads under their maintenance conditions, the dimensional parameters of the impeller locking plate can be designed similarly with reference to the above steps, such as the center angle β, inner diameter R11, outer diameter R12, thickness h, etc., or the number of pin sleeves in a group and the dimensional parameters of the pin sleeves, such as major diameter, minor diameter, height, etc.

[0080] In some embodiments, as Figure 2As shown, the impeller locking plate 1 has weight-reducing fillets 14 at both ends of its outer edge. This reduces both the weight of the impeller locking plate 1 and stress concentration at the edge of the plate. The radius of curvature r of the fillets is determined by the unit's power rating and the torque load under maintenance conditions, and will not be further described.

[0081] In some embodiments, as Figure 2 As shown, the impeller locking piece 1 is provided with weight-reducing recesses 15 at both ends of the inner edge, and the contour line of the weight-reducing recess 15 may include multiple segments.

[0082] The weight-reducing recess 15 is recessed into the impeller locking plate 1 to avoid positional interference, leaving ample clearance for connecting the connector via the flange mounting hole 32 within the nacelle. This avoids increasing the locking plate's dimensions circumferentially or radially to meet operational space requirements. Furthermore, this reduces stress concentration at the edges of the locking plate.

[0083] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 As shown, the inner hole 21 of the pin sleeve 2 can be a cylindrical hole or a conical hole, a plain hole or a threaded hole with an internal thread, or a hole with a portion being a plain hole and a portion being a threaded hole with an internal thread. Accordingly, the first connecting member passing through the inner hole 21 can be a bolt, a stud, a nut, a locking washer, etc.

[0084] In some embodiments, as Figure 1 、 Figure 4 and Figure 5 As shown, the coupling hole 13 can be a cylindrical hole or a conical hole, a plain hole or a threaded hole with an internal thread, or a portion thereof being a plain hole and another portion thereof being a threaded hole with an internal thread. Accordingly, the second coupling member passing through the coupling hole 13 can be a bolt, a stud, or a nut or a locking washer.

[0085] The following further describes the impeller locking disc of this embodiment with reference to the accompanying drawings, with respect to scenarios such as processing, assembly, installation, and locking.

[0086] like Figure 1 、 Figure 2 、 Figure 5As shown, the impeller locking disc provided in the wind turbine generator set according to an embodiment of the present invention includes three impeller locking plates 1, forming a three-piece split structure. After being connected to the main shaft, the three impeller locking plates are evenly distributed along the circumference of the impeller's rotation and each corresponds to a blade. For example, on a plane perpendicular to the centerline around which the impeller rotates, the centerlines of the three impeller locking plates may intersect with the centerline O of the main shaft. After each set of three pin sleeves is respectively set in the three pin sleeve holes 11 of each impeller locking plate, the impeller locking plate is securely connected to the main shaft flange. Subsequently, the first and second connecting parts are respectively passed through the inner hole and the connecting hole and then continue through the mounting hole of the flange to further securely connect the impeller locking plate to the main shaft flange.

[0087] In this way, the segmented design can optimize the structure, volume and weight of the impeller locking disc, which is conducive to reducing the procurement cost of the impeller locking disc.

[0088] When hoisting the nacelle, move any blade to the 6 o'clock position on the rotor plane, and then lock the impeller by passing two pins through the two pin holes 12. At this time, the other two impeller locking tabs 1 are respectively at the 2 o'clock and 10 o'clock positions on the rotor plane. When the blades are horizontal, the two pins are still passed through the two pin holes 12 to lock the impeller.

[0089] Each piece weighs 240 kg, and the three pieces together weigh 720 kg, a weight reduction of 600 kg compared to the previous single-piece structure. The calculated procurement cost is approximately 20,000 yuan, a reduction of 25,000 yuan compared to the previous single-piece structure, representing a reduction of at least 50%. Thus, the application of the segmented impeller locking disc structure in wind turbines has excellent technical significance and economic benefits.

[0090] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5As shown, in the assembly workshop, one impeller locking plate 1 is placed in a predetermined orientation above the main shaft flange, with the three pin sleeve holes 11 aligned with the corresponding three flange holes 31 of the main shaft flange. The liquid nitrogen-cooled pin sleeve 2 is then inserted from top to bottom into the pin sleeve hole 11 and flange hole 31, respectively. At this point, a cold-install clearance exists between the cooled pin sleeve 2 and the pin sleeve hole 11 or flange hole 31, creating a clearance fit that reduces assembly difficulty. After the pin sleeve 2 returns to room temperature, the thermal expansion and contraction effects cause the cold-install clearance to disappear, and the pin sleeve 2 forms an interference fit with the flange hole 31 and the pin sleeve hole 11, respectively. The three pin sleeves 2 securely connect the impeller locking plate 1 to the main shaft flange. Repeat these steps to securely connect the other two impeller locking plates to the main shaft flange in the predetermined orientation. Ultimately, the three impeller locking plates 1 are evenly distributed along the impeller's rotational centerline.

[0091] like Figure 3 、 Figure 4 As shown, the flange hole 31 provided in the main shaft flange 3 is a stepped hole. The side facing the impeller locking tab has a larger diameter to accommodate the pin sleeve 2, and the other side facing the impeller has a smaller diameter to accommodate the first connecting member. In other words, the length of the pin sleeve 2 within the flange hole 31 is less than the depth of the flange hole 31 or the thickness of the flange 3. The stepped surface of the stepped hole can position the bottom surface of the pin sleeve 2. This prevents the cooled pin sleeve 2 from slipping out of the flange hole of the main shaft flange 3 due to the cold installation gap during installation.

[0092] Thus, on the upper side, the pin sleeve 2 is interference-fitted with the pin sleeve hole 11. On the lower side, the pin sleeve 2 is interference-fitted with the flange hole 31 of the main shaft flange 3.

[0093] During processing, after each mounting hole is processed, three adjacent mounting holes in a preset orientation are expanded respectively to form a stepped hole.

[0094] The above-mentioned fitting or adaptation respectively has fitting accuracy, dimensional tolerance, shape error, contour error, and / or form and position error, etc. well known to those skilled in the art, and will not be elaborated herein.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0096] The above description is only illustrative of the present invention and not restrictive. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, and all of them will fall within the scope of protection of the present invention.

Claims

1. An impeller locking plate provided in a wind turbine generator set, characterized in that: include: A plurality of impeller locking pieces (1) are arranged at intervals along the circumference of the impeller of the unit, and the impeller locking pieces (1) are connected to the main shaft flange (3) so that when the blades drive the impeller to rotate, the impeller locking pieces (1) rotate along with the impeller; Each impeller locking piece (1) is provided with a plurality of pin holes (12) for accommodating a plurality of locking pins; The plurality of locking pins are used to lock the corresponding impeller locking pieces (1) at preset positions on the frame or the cabin through the corresponding plurality of pin holes (12); Multiple sets of pin bushings (2); Each impeller locking piece (1) is further provided with a plurality of pin sleeve holes (11); Each set of pin sleeves (2) is used to be correspondingly arranged in the plurality of pin sleeve holes (11) of an impeller locking piece (1), and is connected to the impeller locking piece (1) through the flange hole (31) of the main shaft flange (3), wherein the pin sleeves (2) cooled by liquid nitrogen are sequentially inserted from top to bottom into the pin sleeve hole (11) and the flange hole (31); The pin sleeve (2) is provided with an inner hole (21) for accommodating the first connecting member; Each of the first connecting pieces is used to pass through the inner hole (21) and the flange hole (31) of the main shaft flange (3), so that the impeller locking piece (1) is connected to the main shaft flange (3), wherein the flange hole (31) provided on the main shaft flange (3) is a stepped hole, the side facing the impeller locking piece (1) has a large diameter to accommodate the pin sleeve (2), and the other side facing the impeller has a small diameter to accommodate the first connecting piece; The impeller locking piece (1) comprises an annular arc body having a preset center angle β and a preset thickness, and the sum of the preset center angles β of all the impeller locking pieces (1) is not greater than 180 degrees, 200 degrees or 360 degrees; The impeller locking piece (1) is provided with weight-reducing fillets (14) at both ends of its outer edge; The impeller locking piece (1) is provided with weight-reducing recesses (15) at both ends of the inner edge, and the weight-reducing recesses (15) are indented into the interior of the impeller locking piece (1).

2. The impeller locking plate according to claim 1, characterized in that: Each impeller locking piece (1) is further provided with a plurality of coupling holes (13), wherein the plurality of coupling holes (13) are used to accommodate a plurality of second coupling members; Each of the second connecting pieces is used to pass through the corresponding connecting hole (13) and the mounting hole (32) of the main shaft flange (3), so that the impeller locking piece (1) is connected to the main shaft flange (3).

3. The impeller locking disk according to any one of claims 1 to 2, characterized in that: The number of the pin holes (12) is 2.

4. The impeller locking plate according to claim 1, characterized in that: The number of the pin sleeves (2) is 3, and the material of the pin sleeves (2) is 42CrMo.

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