Wind driven generator stator core hot jacket pressure maintaining device and method

Abstract

The invention relates to the technical field of wind driven generator stator core hot jacket, in particular to a wind driven generator stator core hot jacket pressure maintaining device and method. In order to solve the problem that the defects exist in an existing stator iron core hot jacket method, the novel wind driven generator stator iron core hot jacket pressure maintaining device and method are provided, and the novel wind driven generator stator iron core hot jacket pressure maintaining device comprises an upper pressurization annular plate, a lower pressurization annular plate, a plurality of ejector rods, a plurality of pull rods, a plurality of L-shaped pull-down plates and a plurality of pull-down bolts, and the upper pressurization annular plate and the lower pressurization annular plate are coaxially arranged at the upper end and the lower end of a stator iron core. The device is matched with the implementation method, so that the hoisting and hot sleeving quality of the stator iron core is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of shrink-fitting of a stator core of a wind generator, and in particular to a shrink-fitting pressure-maintaining device and method for shrink-fitting of a stator core of a wind generator. Background Art

[0002] Common wind turbines can be divided into three categories: doubly-fed wind turbines, direct-drive wind turbines, and semi-direct-drive wind turbines. At present, in order to adapt to the current economic situation, wind turbines of various structural types have made major adjustments in their technical routes, and have developed direct-drive wind turbines with a similar semi-direct-drive structure, in which the stator assembly includes a stator core and a frame 2, and the stator core includes a core punching 1, a tooth pressure plate 3, and a pressure ring 4, such as Figure 1 As shown, the stator core and the frame are still heat-fitted, with the axial length being comparable, but the diameter being greatly increased.

[0003] The existing method of heat-fitting the stator core is to directly lift the stator core pressing ring after leveling at four points around the circle, complete the heat-fitting with the machine base, and then cool it to room temperature. This heat-fitting method has the following disadvantages: 1) The lifting process is four-point lifting on the pressing ring 4. The overall structural strength of the core punching sheet 1 is limited after stacking, and it is easy to deform. The stopper fit effect of the core punching sheet 1 and the machine base 2 after heat-fitting is poor; 2) During the cooling process of the machine base 2, the machine base 2 structure may have an irregular shape, and the size changes unevenly during the cooling and shrinking process, which will cause the inner diameter cylindricality of the stator core to exceed the tolerance, and it is difficult to reshape and repair; 3) The circumference of the stator core is stacked by multiple punching sheets, especially at the joint position, which is easily misaligned due to lifting deformation or cooling shrinkage extrusion, which affects the embedding of the coil in the subsequent process; 4) After the stacking is completed and the stacking tooling is removed, the core punching sheets at both ends will still have tooth expansion problems, causing the length of the stator core to exceed the tolerance. Summary of the invention

[0004] In order to solve the above-mentioned defects of the existing stator core shrink-fit method, the present invention provides a new wind turbine stator core shrink-fit pressure maintaining device and method.

[0005] The present invention is achieved by adopting the following technical solutions: A wind turbine stator core shrink-fit pressure-maintaining device comprises an upper pressure ring plate and a lower pressure ring plate coaxially arranged at the upper and lower ends of the stator core, a plurality of push rods, a plurality of pull rods, a plurality of L-shaped pull-down plates, and a plurality of pull-down bolts, the lower end of each push rod being a small cylindrical section, the middle being a large cylindrical section, the upper end being an upper threaded section and being adapted to have an upper nut, each pull rod being an extended bolt and being adapted to have a lower nut, a pull-down through hole which is gap-matched with the pull-down bolt is provided on the horizontal plate of each L-shaped pull-down plate, the end of the horizontal plate of each L-shaped pull-down plate is pressed down to the lower bottom surface of the machine base, the vertical plate of each L-shaped pull-down plate is located below the lower pressure ring plate and its height is less than the distance between the bottom surface of the lower pressure ring plate and the bottom surface of the machine base, the outer edges of the inner side surfaces of the two pressure ring plates are provided with pressure grooves whose groove depth is less than the axial length of the stator core pressure ring, the two pressure ring plates are provided with a plurality of circumferentially uniformly distributed first through holes and a plurality of circumferentially uniformly distributed second through holes, The plurality of first through holes on the two pressure ring plates correspond to each other up and down, and the plurality of second through holes correspond to each other up and down. The outer edge portion of the upper pressure ring plate is provided with a plurality of first threaded holes, and the first threaded holes are adapted to be equipped with eye screws. The outer edge portion of the lower pressure ring plate is provided with a plurality of second threaded holes that are evenly distributed in the circumference and are adapted to the lower pull-down bolts. The number of the first through holes, the second through holes, the second threaded holes, the push rods and the pull rods are the same. The first through holes and the second through holes are both located at the inner edge portions of the two upper pressure ring plates, and the plurality of pull rods and the plurality of push rods are both arranged on the inner side of the stator core. The first through holes corresponding to the upper and lower portions of the two pressure ring plates are respectively clearance-matched with the upper threaded section and the small cylindrical section of the corresponding push rods, and the upper nut is located below the upper pressure ring plate. The second through holes corresponding to the upper and lower portions of the two pressure ring plates are respectively clearance-matched with the two end portions of the corresponding pull rods, and the lower nut is located below the lower pressure ring plate, and the second threaded holes on the lower pressure ring plate are threadedly connected with the corresponding lower pull-down bolts.

[0006] Principle description: The stacking of the stator core will produce a certain degree of tooth expansion. The device, through the design of the depth of the pressure groove, makes the stator punching with tooth expansion produce a certain pressure-maintaining effect after the upper pressure ring plate and the lower pressure ring plate are installed, thereby reducing the tooth expansion; the top rod serves as the reaction force arm of the pressure-maintaining device; the pull rod cooperates with the lower nut to clamp the stator core; the height of the vertical plate of each L-shaped pull-down plate is less than the distance between the bottom surface of the lower pressure ring plate and the bottom surface of the machine base. During the tightening process of the pull-down bolt, the L-shaped pull-down plate will produce a downward pre-tightening force on the stator core.

[0007] Furthermore, the upper pressure ring plate and the lower pressure ring plate are both provided with a plurality of weight-reducing holes evenly distributed in the circumferential direction, and the plurality of weight-reducing holes are circumferentially spaced apart from the first through holes.

[0008] Furthermore, the device also includes a plurality of slot positioning keys which are transitionally matched with the bottom of the stacked core punching slots, and the length of the slot positioning keys is less than or equal to the length of the core punching. Since the circumference of the stator core is formed by stacking a plurality of core punchings, there are a plurality of core punching seams, and the core punching seams are the weak points of the stator core deformation. The slot positioning keys are installed at the bottom of the core punching slots to effectively maintain the stator's anti-deformation ability during hoisting, and to prevent the stator core from excessively collapsing inward after the stator core and the machine base are shrink-fitted.

[0009] Furthermore, the plurality of slot locating keys are all heat-treated slot locating keys to enhance structural strength and wear resistance.

[0010] Furthermore, a clamping groove is provided in the middle of each push rod to facilitate clamping the push rod when the nut is screwed on.

[0011] Furthermore, outer edges of the outer side surfaces of the upper pressure ring plate and the lower pressure ring plate are chamfered to facilitate installation.

[0012] Furthermore, there are 12 push rods, 12 pull rods, 12 L-shaped pull-down plates, 12 pull-down bolts, 12 first through holes, second through holes, second threaded holes, and pull-down through holes, 4 first threaded holes, and they are evenly distributed circumferentially on the outer edge of the upper pressure ring plate. The structure is concretized and standardized, which further improves the stability of the device.

[0013] Furthermore, there are 12 weight-reducing holes.

[0014] Furthermore, the upper nut is provided with an upper gasket, and the lower nut is provided with a lower gasket.

[0015] The method of realizing heat-shrink pressure maintenance of the stator core of a wind turbine generator by using the above-mentioned pressure maintenance device comprises the following steps: 1) evenly installing a plurality of slot positioning keys at the bottom of the slots of the core punching sheets after stacking; 2) placing the lower pressure ring plate on the support platform and avoiding the first through hole and the second through hole at the supporting point between the lower pressure ring plate and the support platform; 3) placing the stator core on the top of the lower pressure ring plate through the lifting eye screw and the lifting device, and the stator core pressure ring is placed in a matching manner with the pressure groove on the lower pressure ring plate; 4) inserting the small cylindrical sections of a plurality of push rods into the first through hole of the lower pressure ring plate and the upper threaded section of the push rod is facing upward, installing the upper nut and the upper washer on the upper threaded section and screwing the upper nut and the upper washer to the bottom of the upper threaded section; 5) lifting the upper pressure ring plate to the top of the stator core and making the upper pressure ring plate, the lower pressure ring plate and the lower pressure ring plate close to each other. Align the first through hole and the second through hole on the pressure ring plate up and down, adjust the upper nut and the upper washer so that the upper washer contacts the upper pressure ring plate and ensure that the circumferential gap between the pressure groove and the pressure ring is uniform; 6) Install the pull rod, lower nut and lower washer so that the lower nut contacts the lower pressure ring plate; 7) Tighten all lower nuts to the standard torque; 8) Lift the assembled structure of the stator core and the upper and lower pressure ring plates as a whole and install it on the machine base that is supported by the support platform to a certain height and heated. After installation, ensure that the installation height of the machine base and the stator core is appropriate and uniform; 9) Install the L-shaped pull-down plate and pull-down bolts, and tighten the pull-down bolts to the rated torque; 10) Loosen the pull-down bolts for a period of time until the machine base cools to room temperature.

[0016] The beneficial effects of the present invention are as follows: the stator core installed with the device described in the present invention has a good supporting and fixing effect, has good overall consistency with the pressure-maintaining device, and is not easy to deform during the lifting process. Previously, the stator pressure ring was directly lifted at a single point, and there were few stress points, which made it easy for the stator core with a larger diameter and a shorter axial length to deform. After the stator core and the machine base are heat-fitted, the shrinkage process of the machine base will cause uneven shrinkage of the machine base due to the structural characteristics of the machine base, which will further cause deformation of the stator core and uneven stator-rotor gap after assembly. After being clamped by the pressure-maintaining device, the stator core moves up and down during the cooling process of the heat-fitting. After the two ends are clamped, the overall structural strength is increased. During the cooling process of the machine base, the influence of the deformation of the machine base on the stator core is greatly reduced. After the shrink fitting, the stator core and the machine base stop may not fit completely. Under the action of the L-shaped pull-down plate, the stator core as a whole generates a downward negative pressure to ensure that the stator core and the end face of the machine base stop fit completely. According to the method, the pressing bolts fixing the L-shaped pull-down plate are regularly loosened to prevent the hidden danger of uneven shrinkage of the machine base due to the friction of the L-shaped pull-down plate during the cooling and tightening process of the machine base. This set of devices, in conjunction with the implementation method, ensures the quality of lifting and shrink fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a schematic diagram of the existing stator assembly structure; Figure 2 It is a structural schematic diagram of the stator core shrink-fit pressure-maintaining device of the present invention; Figure 3 for Figure 2 A partial enlarged schematic diagram of Figure 4 is a structural schematic diagram of the upper pressure ring plate; Figure 5 for Figure 4 A cross-sectional view of Figure 6 It is a structural schematic diagram of the lower pressure ring plate; Figure 7 is a schematic diagram of the structure of the ejector rod; Figure 8 is a schematic diagram of the structure of the pull rod; Fig. 9 It is a structural schematic diagram of an L-shaped pull-down plate; Fig.10 This is a schematic diagram of the structure of the slot positioning key.

[0020] In the figure: 1-core punching sheet, 2-machine base, 3-tooth pressure plate, 4-pressure ring, 5-upper pressure ring plate, 6-lower pressure ring plate, 7-pull rod, 71-clamping groove, 72-small cylindrical section, 73-large cylindrical section, 74-upper threaded section, 8-upper nut, 9-pull rod, 10-lower nut, 11-groove positioning key, 12-pull-down bolt, 13-L-type pull-down plate, 14-pull-down through hole, 15-first through hole, 16-second through hole, 17-first threaded hole, 18-second threaded hole, 19-weight reduction hole, 20-pressure groove, 21-eye screw. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0022] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] like Figure 2-10As shown, a wind turbine stator core shrink-fit pressure-maintaining device comprises an upper pressure ring plate 5 and a lower pressure ring plate 6 coaxially arranged at the upper and lower ends of the stator core, a plurality of mandrels 7, a plurality of tie rods 9, a plurality of L-shaped pull-down plates 13, and a plurality of pull-down bolts 12. The lower end of each mandrel 7 is a small cylindrical section 72, the middle is a large cylindrical section 73, the upper end is an upper threaded section 74 and is adapted to be equipped with an upper nut 8, each tie rod 9 is an extended bolt and is adapted to be equipped with a lower nut 10, and a horizontal plate of each L-shaped pull-down plate 13 is provided with a threaded section 74 that is adapted to be equipped with an upper nut 8. 2 The end of the horizontal plate of each L-shaped pull-down plate 13 is pressed down to the bottom surface of the base 2, and the vertical plate of each L-shaped pull-down plate 13 is located below the lower pressure ring plate 6 and its height is less than the distance between the bottom surface of the lower pressure ring plate 6 and the bottom surface of the base 2. The outer edges of the inner side surfaces of the two pressure ring plates are provided with a pressure groove 20 whose groove depth is less than the axial length of the stator core pressing ring 4. The two pressure ring plates are provided with a plurality of circumferentially uniformly distributed first through holes 15 and a plurality of circumferentially uniformly distributed second through holes 16. The two pressure ring plates are provided with a plurality of circumferentially uniformly distributed first through holes 15 and a plurality of circumferentially uniformly distributed second through holes 16. The plurality of first through holes 15 on the ring plate correspond to each other up and down, and the plurality of second through holes 16 correspond to each other up and down. The outer edge of the upper pressure ring plate 5 is provided with a plurality of first threaded holes 17, and the first threaded holes 17 are adapted with eye screws 21. The outer edge of the lower pressure ring plate 6 is provided with a plurality of second threaded holes 18 that are uniformly distributed in the circumference and are adapted to the lower pull bolts 12. The number of the first through holes 15, the second through holes 16, the second threaded holes 18, the push rods 7, and the pull rods 9 is the same. The first through holes 15 and the second through holes 16 are both located on the two upper pressure ring plates. 5, multiple tie rods 9 and multiple push rods 7 are arranged on the inner side of the stator core, the upper and lower corresponding first through holes 15 of the two pressure ring plates are respectively clearance-matched with the upper threaded section 74 and the small cylindrical section 72 of the corresponding push rod 7, and the upper nut 8 is located below the upper pressure ring plate 5, the upper and lower corresponding second through holes 16 of the two pressure ring plates are respectively clearance-matched with the two end portions of the corresponding tie rods 9, and the lower nut 10 is located below the lower pressure ring plate 6, and the second threaded hole 18 on the lower pressure ring plate 6 is threadedly connected with the corresponding lower pull bolt 12.

[0026] Principle description: The overlapping of the core punching sheets 1 will produce a certain degree of tooth expansion, and the device, through the design of the depth of the pressure groove 20, makes the stator punching sheets with tooth expansion produce a certain pressure-maintaining effect after installing the upper pressure ring plate 5 and the lower pressure ring plate 6, thereby reducing the tooth expansion; the top rod 7 serves as the reaction force arm of the pressure-maintaining device; the pull rod 9 cooperates with the lower nut 10 to clamp the stator core; the height of the vertical plate of each L-shaped pull-down plate 13 is less than the distance between the bottom surface of the lower pressure ring plate 6 and the bottom surface of the machine base 2, and the pull-down bolt 12 will cause the L-shaped pull-down plate 13 to produce a downward pre-tightening force on the stator core during the tightening process.

[0027] In a specific implementation, a plurality of circumferentially evenly distributed weight-reducing holes 19 are provided on both the upper pressure ring plate 5 and the lower pressure ring plate 6 , and the plurality of weight-reducing holes 19 are circumferentially spaced from the first through holes 15 .

[0028] In specific implementation, the device also includes a plurality of slot positioning keys 11 that are transitionally matched with the slot bottom of the laminated core punching sheet 1, and the length of the slot positioning keys 11 is less than or equal to the length of the stator core. Since the circumference of the stator core is formed by laminating a plurality of fan-shaped core punching sheets 1, there are a plurality of sets of core punching sheet 1 punching seams, and the core punching sheet 1 seams are the weak points of the stator core deformation. By installing the slot positioning keys 11 at the slot bottom of the stator core punching sheet 1, the stator hoisting anti-deformation capability is effectively maintained, and the stator core is prevented from excessive inward collapse after the stator core and the machine base 2 are heat-fitted.

[0029] In specific implementation, the plurality of slot positioning keys 11 are all slot positioning keys 11 after heat treatment to enhance the structural strength and wear resistance.

[0030] In specific implementation, a clamping groove 71 is provided in the middle of each push rod 7 to facilitate clamping the push rod 7 when the nut 8 is screwed on.

[0031] In specific implementation, the outer edges of the outer side surfaces of the upper pressure ring plate 5 and the lower pressure ring plate 6 are chamfered to facilitate installation.

[0032] In a specific implementation, there are 12 push rods 7, 12 pull rods 9, 12 L-shaped pull-down plates 13, 12 pull-down bolts 12, 12 first through holes 15, 12 second through holes 16, 12 second threaded holes 18, and 12 pull-down through holes 14, 4 first threaded holes 17, and they are evenly distributed circumferentially on the outer edge of the upper pressure ring plate 5. The structure is concretized and standardized, and the stability of the device is improved in a specific implementation.

[0033] In a specific implementation, the number of the weight-reducing holes 19 is 12.

[0034] During specific implementation, the upper nut 8 is provided with an upper gasket, and the lower nut 10 is provided with a lower gasket.

[0035] The method for realizing heat-shrink pressure maintenance of the stator core of a wind turbine using the above-mentioned pressure maintenance device comprises the following steps: 1) evenly installing a plurality of slot positioning keys 11 at the bottom of the slot of the laminated core punching sheet 1; 2) placing the lower pressure ring plate 6 on a support platform and avoiding the first through hole 15 and the second through hole 16 at its supporting point with the support platform; 3) placing the stator core on the top of the lower pressure ring plate 6 through the lifting eye screw 21 in cooperation with the lifting device, and the stator core pressure ring 4 is placed in a matching manner with the pressure groove 20 on the lower pressure ring plate 6; 4) inserting the small cylindrical sections 72 of a plurality of push rods 7 into the first through hole 15 of the lower pressure ring plate 6 and with the upper threaded section 74 of the push rod 7 facing upward, installing the upper nut 8 and the upper washer on the upper threaded section 74 and screwing the upper nut 8 and the upper washer to the bottom of the upper threaded section 74; 5) lifting the upper pressure ring plate 5 to the top of the stator core and making the upper pressure ring plate 5, The first through hole 15 and the second through hole 16 on the lower pressure ring plate 6 are aligned vertically, and the upper nut 8 and the upper washer are adjusted so that the upper washer contacts the upper pressure ring plate 5 and the circumferential gap between the pressure groove 20 and the pressure ring 4 is uniform; 6) Install the pull rod 9, the lower nut 10 and the lower washer so that the lower nut 10 contacts the lower pressure ring plate 6; 7) Tighten all the lower nuts 10 to the standard torque; 8) The assembled structure of the stator core and the upper pressure ring plate 5 and the lower pressure ring plate 6 is hoisted and installed on the machine base 2 which is supported by the support platform to a certain height and heated. After installation, ensure that the installation height of the machine base 2 and the stator core is appropriate and uniform; 9) Install the L-shaped pull-down plate 13 and the pull-down bolt 12, and tighten the pull-down bolt 12 to the rated torque; 10) Loosen the pull-down bolt for a period of time until the machine base 2 cools to room temperature.

[0036] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A wind turbine stator core shrink-fit pressure-maintaining device, characterized in that: The invention comprises an upper pressure ring plate (5) and a lower pressure ring plate (6) coaxially arranged at the upper and lower ends of the stator core, a plurality of push rods (7), a plurality of pull rods (9), a plurality of L-shaped pull-down plates (13), and a plurality of pull-down bolts (12). The lower end of each push rod (7) is a small cylindrical section (72), the middle part is a large cylindrical section (73), the upper end is an upper threaded section (74) and is equipped with an upper nut (8). Each pull rod (9) is an extended bolt and is equipped with a lower nut (10). The horizontal plate of each L-shaped pull-down plate (13) is provided with a pull-down through hole (14) which is clearance-matched with the pull-down bolt (12). The end of the horizontal plate of each L-shaped pull-down plate (13) is pressed down to the bottom surface of the machine base (2); the vertical plate of each L-shaped pull-down plate (13) is located below the lower pressure ring plate (6) and its height is less than the distance between the bottom surface of the lower pressure ring plate (6) and the bottom surface of the machine base (2); the outer edges of the inner side surfaces of the two pressure ring plates are provided with a pressure groove (20) whose groove depth is less than the axial length of the stator core pressure ring (4); the two pressure ring plates are provided with a plurality of circumferentially uniformly distributed first through holes (15) and a plurality of circumferentially uniformly distributed second through holes (16); the plurality of first through holes (15) on the two pressure ring plates are connected to each other in an upper and lower direction; The plurality of second through holes (16) correspond to each other up and down, a plurality of first threaded holes (17) are provided on the outer edge of the upper pressure ring plate (5), and the first threaded holes (17) are adapted to be equipped with eyebolts (21), and a plurality of second threaded holes (18) are provided on the outer edge of the lower pressure ring plate (6), which are evenly distributed in the circumference and adapted to the lower pull bolts (12), and the number of the first through holes (15), the second through holes (16), the second threaded holes (18), the push rods (7), and the pull rods (9) is the same, and the first through holes (15) and the second through holes (16) are both located at the inner edge of the two upper pressure ring plates (5). , a plurality of tie rods (9) and a plurality of push rods (7) are arranged on the inner side of the stator core, the first through holes (15) corresponding to the upper and lower parts of the two pressure ring plates are respectively clearance-matched with the upper threaded section (74) and the small cylindrical section (72) of the corresponding push rod (7), and the upper nut (8) is located below the upper pressure ring plate (5), the second through holes (16) corresponding to the upper and lower parts of the two pressure ring plates are respectively clearance-matched with the two ends of the corresponding tie rods (9), and the lower nut (10) is located below the lower pressure ring plate (6), and the second threaded hole (18) on the lower pressure ring plate (6) is threadedly connected with the corresponding lower pull bolt (12).

2. A wind turbine stator core shrink-fit pressure-maintaining device according to claim 1, characterized in that: The device also includes a plurality of slot positioning keys (11) which are transitionally matched with the slot bottoms of the laminated core punching sheets (1), and the length of the slot positioning keys is less than or equal to the length of the stator core.

3. A wind turbine stator core shrink-fit pressure-maintaining device according to claim 2, characterized in that: The plurality of slot positioning keys (11) are all slot positioning keys (11) that have been heat treated.

4. A wind turbine stator core shrink-fit pressure-maintaining device according to claim 3, characterized in that: The pressure ring plate (5) and the lower pressure ring plate (6) are both provided with a plurality of weight-reducing holes (19) evenly distributed in the circumferential direction, and the plurality of weight-reducing holes (19) and the first through hole (15) are arranged at intervals in the circumferential direction.

5. A wind turbine stator core shrink-fit pressure-maintaining device according to claim 4, characterized in that: A clamping groove (71) is provided in the middle of each push rod (7).

6. A wind turbine stator core shrink-fit pressure-maintaining device according to claim 5, characterized in that: The outer edges of the outer side surfaces of the upper pressure ring plate (5) and the lower pressure ring plate (6) are both chamfered.

7. A wind turbine stator core shrink-fit pressure-maintaining device according to claim 6, characterized in that: There are 12 push rods (7), 12 pull rods (9), 12 L-shaped pull-down plates (13), 12 pull-down bolts (12), 12 first through holes (15), 12 second through holes (16), 12 second threaded holes (18), and 12 pull-down through holes (14), and 4 first threaded holes (17) that are evenly distributed in the circumferential direction on the outer edge of the upper pressure ring plate (5).

8. A wind turbine stator core shrink-fit pressure-maintaining device according to claim 7, characterized in that: There are 12 weight-reducing holes (19).

9. A wind turbine stator core shrink-fit pressure-maintaining device according to claim 8, characterized in that: The upper nut (8) is provided with an upper gasket, and the lower nut (10) is provided with a lower gasket.

10. A method for heat shrinkage and pressure preservation of a stator core of a wind turbine generator, characterized in that: The method is implemented by using a wind turbine stator core shrink-fit pressure-maintaining device as described in claim 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, and specifically comprises the following steps: 1) evenly installing a plurality of slot positioning keys (11) on the bottom of the slots of the laminated core punching sheets (1); 2) placing the lower pressure ring plate (6) on a support platform, and its supporting point with the support platform avoids the first through hole (15) and the second through hole (16); 3) placing the stator core on the top of the lower pressure ring plate (6) through the lifting eye screw (21) in conjunction with the lifting device, and the stator core pressure ring (4) is placed in an adapted manner with the pressure groove (20) on the lower pressure ring plate (6); 4) inserting a plurality of small cylindrical sections (72) of the push rods (7) into the first through hole (15) of the lower pressure ring plate (6) and the push rods (7) are inserted ... The upper threaded section (74) of the rod (7) faces upward, and the upper nut (8) and the upper washer are installed on the upper threaded section (74) and screwed to the bottom of the upper threaded section (74); 5) The upper pressure ring plate (5) is lifted to the top of the stator core and the first through hole (15) and the second through hole (16) on the upper pressure ring plate (5) and the lower pressure ring plate (6) are aligned vertically, and the upper nut (8) and the upper washer are adjusted so that the upper washer contacts the upper pressure ring plate (5) and the circumferential gap between the pressure groove (20) and the pressure ring (4) is uniform; 6) The pull rod (9), the lower nut (10) and the lower washer are installed so that the lower nut (10) contacts the lower pressure ring plate (6); 7) All lower nuts (10) are tightened to the standard torque; 8) The assembled structure of the stator core and the upper pressure ring plate (5) and the lower pressure ring plate (6) is hoisted and installed on a machine base (2) which is supported by a support platform at a certain height and has been heated. After installation, ensure that the machine base (2) and the stator core are installed at a suitable and uniform height; 9) Install the L-shaped pull-down plate (13) and the pull-down bolts (12), and tighten the pull-down bolts (12) to the rated torque; 10) Loosen the pull-down bolts for a period of time at regular intervals until the machine base (2) cools to room temperature, thereby completing the heat-shrinkage and pressure-maintaining of the stator core.

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