Stator and rotor separation method for preventing stator and rotor adsorption of direct-driven wind driven generator
Through the method of 'demagnetization first and then separation' and the pole box removal device, combined with the jack support plate, the problem of separation difficulties and absorption of the rotor of the direct drive wind turbine generator without guide shaft structure is solved, and 100% anti-adsorption effect is achieved , suitable for a variety of wind turbine types.
Patent Information
- Application Number
- CN202411207704.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2024-12-10
AI Technical Summary
The stator separation of the stator of the direct drive wind turbine without a guide shaft structure is difficult, and the problem of stator suction and engagement is prone to occur. The prior art fails to provide a 100% anti-adsorption separation method.
Using the method of 'demagnetization first and then separation', the magnetic steel on the rotor is taken out through the magnetic pole box removal device, and the magnetic pole box pull rod, isolation plate and anti-sucking block combination device avoids the magnetic pole box adsorption, and then the rotor is separated, and the Use a jack support plate when necessary to prevent suction.
The problem of stator pull-in is achieved by 100% avoiding the problem of stator pull-in, ensuring the safety and efficiency of stator separation, and is suitable for direct drive wind turbines without guide shaft structures, and can be expanded to other types of wind turbines.
Smart Images
Figure CN119109262A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of wind turbine maintenance, and in particular to a method for separating a stator and a rotor of a direct-drive wind turbine for preventing the stator and the rotor from being adsorbed. Background Art
[0002] Direct-drive wind turbines have a variety of structural forms, and a pole box direct-drive wind turbine without a guide shaft structure is one of them. This type of generator has the characteristics of compact structure, easy assembly and high stability. When a wind turbine fails and is lowered from the tower, it is usually necessary to separate the stator and rotor before repairing the stator and rotor. It is relatively easy to separate the stator and rotor of a generator with a guide shaft structure, and the technology is relatively mature, that is, the guide shaft is used to design a guide tool to prevent the stator and rotor from being attracted during the separation process. However, for a pole box direct-drive wind turbine without a guide shaft structure, it is relatively difficult to separate the stator and rotor due to the lack of a guide structure. If the stator is directly lifted out of the rotor by the traditional method, it is very easy for the stator and rotor to be attracted and unable to be disassembled.
[0003] At present, in the disassembly process of large direct-drive generators in the wind power industry, there is no 100% anti-adsorption separation method for the stators and rotors of direct-drive wind turbines without a guide shaft structure. Taking maintenance factors into consideration, the stator and rotor separation method of "demagnetizing first and then separating" proposed this time is the first stator and rotor separation method proposed in the field of wind power generator manufacturing that can completely avoid adsorption. Summary of the invention
[0004] To solve the above problems, the present invention discloses a method for separating the stator and rotor of a direct-drive wind turbine generator which can prevent the stator and rotor from adsorbing. The method proposes a stator and rotor separation method of "demagnetizing first and then separating", that is, first removing the magnetic steel on the rotor and then separating the stator and rotor. After the magnetic steel is removed, the rotor is non-magnetic, and the problem of stator and rotor adsorption can be 100% avoided.
[0005] The specific plan is as follows: A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption is based on the stator and rotor structure of the direct-drive wind turbine generator and is characterized in that the pole box on the rotor is first removed by a pole box removal device, and then the stator and rotor are separated.
[0006] As a further improvement of the present invention, the pole box removal device includes a pole box pull rod, a pole box isolation plate, a hexagonal bolt, a flat washer and a pole box anti-absorption block, the pole box pull rod is used to be inserted in the gap between the stator and the rotor, and to cover the entire row of pole boxes and lift them out, wherein the entire row of pole boxes is composed of pole boxes arranged from top to bottom, and the pole box isolation plate is used to be inserted between two adjacent pole boxes and support the lifted pole box, thereby ensuring that only one pole box on it is removed at a time The anti-attraction block of the magnetic pole box is installed in the threaded hole of the end cover on the top of the rotor bracket through two hexagonal bolts and corresponding flat washers, which is used to separate the magnetic pole box from the rotor to prevent the magnetic pole box from turning outward and being attracted to the rotor when it is taken out. Since it is directly installed on the rotor, the greater its thickness, the better its magnetic isolation and anti-attraction performance, and the thickness needs to be larger within a reasonable range.
[0007] As a further improvement of the present invention, the pole box pull rod is a thin-walled strip plate structure, a strip hole is provided in the middle of the lower section, and a hanging hole is provided at the upper end. The thickness of the pole box pull rod is smaller than the gap between the stator and the rotor, and the strip hole is a rectangular hole, whose length and width are respectively larger than the length and width of the entire row of pole boxes, and the hanging hole is connected to the hook of the overhead crane through a matching shackle.
[0008] As a further improvement of the present invention, the magnetic pole box isolation plate is a convex plate, and its protruding portion is inserted between the top two magnetic pole boxes of the entire row of magnetic pole boxes.
[0009] As a further improvement of the present invention, the anti-absorption block of the magnetic pole box is an arc-shaped block and is provided with two waist-shaped holes symmetrically arranged on the left and right sides. The inner contour line of the anti-absorption block of the magnetic pole box is located outside the inner contour line of the rotor house, and the waist-shaped holes are used to install hexagonal head bolts. The purpose is to adjust the position during installation to ensure that the inner diameter contour line of the anti-absorption block of the magnetic pole box is located outside the inner diameter contour line of the rotor house, otherwise it will interfere with the upward lifting of the magnetic pole box.
[0010] As a further modification of the present invention, the pole box pull rod, the pole box isolation plate and the pole box anti-suction block are all made of non-ferromagnetic materials.
[0011] As a further improvement of the present invention, the specific method is: S1. First, cover the entire row of pole boxes with the pole box pull rod, and at the same time, install the pole box anti-absorption block in the threaded hole of the end cover on the top of the rotor bracket through the hexagonal head bolt and the corresponding flat washer; S2. Connect the hook of the overhead crane to the lifting hole through the shackle and slowly lift it up; S3, insert the protruding part of the pole box isolation plate between the top two pole boxes of the entire row of pole boxes, and as the entire row of pole boxes is being hoisted upward, hold the pole box isolation plate with your hands and move it upward, and when the top pole box of the entire row is about to leave the rotor house, grab the pole box with your hands and push it onto the pole box isolation plate to remove the pole box; S4. After all the pole boxes on the rotor house of the wind turbine are taken out in rows, the stator is lifted out of the generator using an overhead crane in conjunction with a hoist. Since there is no magnetism in the rotor house, the stator will not be attracted to the rotor during the lifting process.
[0012] As a further improvement of the present invention, since the pole box type direct-drive wind turbine without a guide shaft structure cannot be installed with a guide fixture, Teflon gaskets need to be evenly placed between the stator and rotor in the circumferential direction before hanging the stator to prevent the stator from colliding with the rotor during the hanging process.
[0013] As a further improvement of the present invention, it also includes a jack support plate, and the jack support plate is an L-shaped plate.
[0014] As a further improvement of the present invention, when a direct-drive wind turbine fails and is taken down from the tower for maintenance, when the rotor end cover is removed, if the internal magnetic poles of the generator are damaged or the rotor house is damaged, there is a certain probability that the rotor house will be deformed and attracted to the stator at the moment the rotor end cover is removed; if this happens, one end of the jack support plate is installed on the generator shaft or stator by bolts, and the position here is determined according to the specific structure of the generator, and the connecting hole can be a threaded hole or a through hole; a jack is placed on the other end plane, and the rotor house attracted to the stator is supported by the jack to separate it from the stator, and then the pole box removal device is used to remove the pole box around the jack.
[0015] The beneficial effects of the present invention are: 1. The present invention is directed to a pole box type direct-drive wind turbine without a guide shaft structure, and separates the stator and rotor by first demagnetizing and then separating. That is, the magnetic steel on the rotor is first taken out and then the stator and rotor are separated, which can 100% avoid the problem of stator and rotor attraction.
[0016] 2. The magnetic pole box removal device involved in the present invention has a novel and unique structure, which includes a magnetic pole box pull rod, a magnetic pole box isolation plate, and a magnetic pole box anti-adsorption block. The three can prevent the magnetic pole box from being adsorbed by surrounding ferromagnetic components during the removal process. The magnetic pole box pull rod can cover the entire row of magnetic poles, wherein the magnetic pole box isolation plate is a "convex" shaped structure.
[0017] 3. The present invention takes into account the situation where the stator and rotor are attracted when the rotor end cover is disassembled, and proposes the use of a jack support plate. The overall structure is "L" shaped, one end of which is connected to the generator shaft or stator, and a jack is placed on the other end to push open the rotor attracted to the stator, effectively preventing the stator and rotor from being attracted when the rotor end cover is disassembled. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 Schematic diagram of the magnetic pole box removal device of the present invention Figure 1 .
[0019] Figure 2 Schematic diagram of the magnetic pole box removal device of the present invention Figure 2 .
[0020] Figure 3 It is a schematic diagram of the pole box pull rod in the present invention.
[0021] Figure 4 It is a schematic diagram of the magnetic pole box isolation plate in the present invention.
[0022] Figure 5 It is a schematic diagram of the anti-suction block of the magnetic pole box in the present invention.
[0023] Figure 6 The jack support plate of the present invention is shown in FIG. Figure 1 .
[0024] Figure 7 The jack support plate of the present invention is shown in FIG. Figure 2 .
[0025] List of reference numerals: 1-pole box pull rod, 2-pole box, 3-pole box isolation plate, 4-hexagon head bolt, 5-flat washer, 6-pole box anti-suction block 6. DETAILED DESCRIPTION
[0026] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.
[0027] The present invention provides a direct-drive wind turbine stator and rotor separation method for preventing stator and rotor adsorption. Based on the stator and rotor structure of the direct-drive wind turbine, the magnetic pole box 2 on the rotor is firstly removed by a magnetic pole box removal device, and then the stator and rotor are separated.
[0028] like Figure 1-2As shown, the pole box removal device includes a pole box pull rod 1, a pole box isolation plate 3, a hexagonal bolt 4, a flat washer 5 and a pole box anti-absorption block 6. The pole box pull rod 1 is used to be inserted in the gap between the stator and the rotor, and to cover the entire row of pole boxes to be lifted out, wherein the entire row of pole boxes is composed of pole boxes arranged from top to bottom, and the pole box isolation plate 3 is used to be inserted between two adjacent pole boxes 2, and to support the lifted pole box, so as to ensure that only the upper pole box is taken out each time, and to prevent the pole box from being sucked out. It can prevent multiple pole boxes from jumping out and being attracted together; it can also support the suspended pole box to prevent the pole box from being attracted to the surrounding ferromagnetic metal. The pole box anti-attraction block 6 is installed in the threaded hole of the end cover on the top of the rotor bracket through two hexagonal head bolts 4 and corresponding flat washers 5, and is used to isolate the pole box 2 from the rotor to prevent the pole box 2 from turning outward and being attracted to the rotor when it is taken out. Since it is directly installed on the rotor, the greater its thickness, the better its magnetic isolation and anti-attraction properties, and the thickness needs to be larger within a reasonable range.
[0029] like Figure 3 As shown, the pole box pull rod 1 is a thin-walled strip plate structure, with a strip hole in the middle of the lower section and a hanging hole at the upper end. The thickness of the pole box pull rod 1 is smaller than the gap between the stator and the rotor, and the strip hole is a rectangular hole, whose length and width are respectively larger than the length and width of the entire row of pole boxes, and the hanging hole is connected to the hook of the overhead crane through a matching shackle.
[0030] like Figure 4 As shown, the pole box isolation plate 3 is a convex plate, and its protruding portion is inserted between the top two pole boxes 2 of the entire row of pole boxes.
[0031] like Figure 5 As shown, the anti-absorption block 6 of the magnetic pole box is an arc-shaped block and is provided with two waist-shaped holes symmetrically arranged on the left and right. The inner contour line of the anti-absorption block 6 of the magnetic pole box is located outside the inner contour line of the rotor house, and the waist-shaped holes are used to install the hexagonal head bolts 4. The purpose is to adjust the position during installation to ensure that the inner diameter contour line of the anti-absorption block of the magnetic pole box is located outside the inner diameter contour line of the rotor house, otherwise it will interfere with the upward lifting of the magnetic pole box.
[0032] In this embodiment, the pole box pull rod 1, the pole box isolation plate 3 and the pole box anti-suction block 6 are all made of non-ferromagnetic materials.
[0033] The specific method of the present invention is: S1. First, cover the entire row of pole boxes with the pole box pull rod 1, and at the same time, install the pole box anti-absorption block 6 in the threaded hole of the end cover at the top of the rotor bracket through the hexagonal head bolt 4 and the corresponding flat washer 5; S2. Connect the hook of the overhead crane to the lifting hole through the shackle and slowly lift it up; S3, insert the protruding part of the pole box isolation plate 3 between the top two pole boxes 2 of the entire row of pole boxes, and as the entire row of pole boxes is being hoisted upward, hold the pole box isolation plate 3 by hand and move it upward, and when the top pole box 2 of the entire row is about to leave the rotor house, grab the pole box by hand and push it onto the pole box isolation plate 3 to remove the pole box; S4. After all the pole boxes 2 on the rotor house of the wind turbine generator are taken out in rows, the stator is lifted out of the generator by using a crane in cooperation with a lifting device. Since there is no magnetism in the rotor house, the stator will not be attracted to the rotor during the lifting process.
[0034] Among them, since the pole box type direct-drive wind turbine without a guide shaft structure cannot be installed with a guide fixture, Teflon gaskets must be evenly placed between the stator and rotor in the circumferential direction before hanging the stator to prevent the stator from colliding with the rotor during the hanging process.
[0035] like Figure 6-7 As shown, it also includes a jack support plate, which is an L-shaped plate.
[0036] When a direct-drive wind turbine fails and is taken down from the tower for maintenance, when the rotor end cover is removed, if the internal magnetic poles of the generator are damaged or the rotor house is damaged, there is a certain probability that the rotor house will be deformed and attracted to the stator at the moment the rotor end cover is removed; if this happens, one end of the jack support plate is bolted to the generator shaft or stator. The position here is determined according to the specific structure of the generator, and the connecting hole can be a threaded hole or a through hole; a jack is placed on the other end of the plane, and the rotor house attracted to the stator is supported by the jack to separate it from the stator, and then the pole box removal device is used to remove the pole box around the jack.
[0037] In addition, the present invention can not only be used for the stator and rotor separation of a pole box type direct-drive wind turbine without a guide shaft structure, but can also be used for the stator and rotor separation of a pole box type direct-drive wind turbine with a guide shaft structure, a pole box type semi-direct-drive wind turbine, and a pole box type doubly-fed wind turbine.
[0038] The pole box removal device used in the present invention has a pole box isolation plate that is not limited to a convex shape, but can also be a long strip or rectangular shape that can be inserted between two pole boxes; the mounting holes on the pole box anti-absorption block are not limited to waist-shaped holes, but can also be holes of other shapes that allow the bolts used to move forward and backward.
[0039] The jack support plate used in the present invention is not limited to the L-shape, and may also be a support plate of other shapes, one end of which can be connected to the stator or the shaft system and the other end of which can be placed on the jack.
[0040] The method of hanging the pole box pull rod upward in the present invention is not limited to using an overhead crane, and other methods can also be used to hang it out.
[0041] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.
Claims
1. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent the adsorption of the stator and rotor, based on the stator and rotor structure of the direct-drive wind turbine generator. It is characterized in that First, the magnetic pole box (2) on the rotor is removed by means of a magnetic pole box removal device, and then the stator and rotor are separated.
2. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption according to claim 1, It is characterized in that The pole box removal device comprises a pole box pull rod (1), a pole box isolation plate (3), a hexagonal bolt (4), a flat washer (5) and a pole box anti-absorption block (6), wherein the pole box pull rod (1) is used to be inserted into the gap between the stator and the rotor, and to cover the entire row of pole boxes for lifting out, wherein the entire row of pole boxes is composed of pole boxes arranged from top to bottom, the pole box isolation plate (3) is used to be inserted between two adjacent pole boxes (2), and to support the lifted pole boxes, and the pole box anti-absorption block (6) is installed in the threaded hole of the end cover at the top of the rotor bracket through two hexagonal bolts (4) and corresponding flat washers (5), and is used to isolate the pole box (2) from the rotor, so as to prevent the pole box (2) from turning outward and being sucked onto the rotor when being taken out.
3. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption according to claim 2, It is characterized in that The pole box pull rod (1) is a thin-walled strip plate structure, with a strip hole in the middle of the lower section and a hanging hole at the upper end. The thickness of the pole box pull rod (1) is smaller than the gap between the stator and the rotor. The strip hole is a rectangular hole, and its length and width are respectively larger than the length and width of the entire row of pole boxes. The hanging hole is connected to the hook of the overhead crane through a matching shackle.
4. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption according to claim 3, It is characterized in that The magnetic pole box isolation plate (3) is a convex plate, and its protruding portion is inserted between the top two magnetic pole boxes (2) of the entire row of magnetic pole boxes.
5. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption according to claim 4, It is characterized in that The magnetic pole box anti-suction block (6) is an arc-shaped block and is provided with two waist-shaped holes which are symmetrically arranged on the left and right. The inner contour line of the magnetic pole box anti-suction block (6) is located outside the inner contour line of the rotor house. The waist-shaped holes are used to install the hexagonal head bolts (4).
6. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption according to claim 5, It is characterized in that The magnetic pole box pull rod (1), the magnetic pole box isolation plate (3) and the magnetic pole box anti-suction block (6) are all made of non-ferromagnetic materials.
7. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption according to claim 6, It is characterized in that The specific method is: S1. First, cover the entire row of pole boxes with the pole box pull rod (1), and install the pole box anti-absorption block (6) in the threaded hole of the end cover at the top of the rotor bracket through the hexagonal head bolt (4) and the corresponding flat washer (5); S2. Connect the hook of the overhead crane to the lifting hole through the shackle and slowly lift it up; S3, insert the protruding part of the pole box isolation plate (3) between the top two pole boxes (2) of the entire row of pole boxes, and as the entire row of pole boxes is being hoisted upward, hold the pole box isolation plate (3) by hand and move it upward, and when the top pole box (2) of the entire row is about to be separated from the rotor house, grab the pole box by hand and push it onto the pole box isolation plate (3) to remove the pole box; S4. After all the pole boxes (2) on the rotor housing of the wind turbine generator are removed in rows, the stator is lifted out of the generator using a crane in conjunction with a lifting device. Since there is no magnetism in the rotor housing, the stator will not be attracted to the rotor during the lifting process.
8. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption according to claim 7, It is characterized in that Since the pole box type direct-drive wind turbine without a guide shaft structure cannot be installed with the guide fixture, Teflon gaskets must be evenly placed in the circumferential direction between the stator and the rotor before the stator is hoisted to prevent the stator from colliding with the rotor during the hoisting process.
9. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption according to claim 8, It is characterized in that It also includes a jack support plate, which is an L-shaped plate.
10. A method for separating the stator and rotor of a direct-drive wind turbine generator to prevent stator and rotor adsorption according to claim 9, It is characterized in that When a direct-drive wind turbine fails and is taken down from the tower for maintenance, when the rotor end cover is removed, if the internal magnetic poles of the generator are damaged or the rotor house is damaged, there is a certain probability that the rotor house will be deformed and attracted to the stator at the moment the rotor end cover is removed; if this happens, one end of the jack support plate is installed on the generator shaft or stator by bolts; a jack is placed flat on the other end, and the rotor house attracted to the stator is supported by the jack to separate it from the stator, and then the pole box removal device is used to remove the pole box around the jack.