Three-section sleeving type split-half engine base structure of large-scale high-pressure hydrogen-cooled motor with multiple wind areas

Abstract

The invention discloses a multi-wind-area large-scale high-pressure hydrogen-cooled motor three-section sleeve type split-half base structure, and relates to the technical field of hydrogen-cooled generators, and the structure comprises a stator base and an end cover which is in sleeve connection with the stator base, and the stator base comprises an upper half stator base and a lower half stator base which are divided into two parts in the horizontal direction. The upper half stator base and the lower half stator base are respectively provided with an upper half base combining plate and a lower half base combining plate at the sectioning positions, the sleeving part is provided with a first ring plate which is combined with the circumference of the end cover, and a sealing cover with an airtight test joint is arranged between the first ring plate and the middle part of the stator base; a first sealing groove is formed in the end, attached to the upper half motor base combining plate, of the lower half motor base combining plate, a rubber strip is arranged in the first sealing groove, the first sealing groove is located between the blind hole and the interior of the motor base, and an airtight cover is arranged outside the upper half stator motor base and the lower half stator motor base. The rigidity, the strength and the sealing performance of the engine base can be guaranteed, and the transportation bottleneck of a high-capacity unit is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen-cooled generators, in particular to a three-section sleeve joint type half-machine base structure of a large high-voltage hydrogen-cooled generator. BACKGROUND

[0002] Large high-voltage hydrogen-cooled generators are widely used due to the excellent heat dissipation of hydrogen, but the stator base needs to withstand high pressure and be strictly sealed. The traditional integral base faces serious transportation bottlenecks (size and weight exceed the limit) as the capacity increases. Although the half-machine base can alleviate the transportation problem, the joint surface of the half-machine base and the connection with the end cover are prone to become hydrogen leakage points, and the sealing reliability is a huge challenge. At the same time, the large split structure needs to ensure sufficient rigidity and strength to prevent deformation from affecting sealing and operation. The existing technology cannot meet the requirements of split transportation, reliable sealing of high-pressure hydrogen (especially complex parts such as corners), and structural rigidity, which restricts the development of large-capacity high-voltage hydrogen-cooled generators.

[0003] Chinese patent document with publication number CN1822475A and publication date August 23, 2006 discloses a half-machine base structure motor, which includes a base and two end covers. The special feature is that the base is composed of an upper seat and a lower seat, the thickness of the upper seat is thinner than that of the lower seat, and the two end covers are fixed at the two ends of the lower seat. The beneficial effects of the invention are that the amount of thick steel plates used for welding the base and the end cover is greatly reduced, the raw material cost is greatly reduced, maintenance is convenient, the ventilation and cooling effect is good, and the performance of the motor is improved.

[0004] However, the above technical solution has serious structural strength deficiency, and the half-machine joint has no sealing design, and hydrogen leaks along the joint in the radial direction.

[0005] Chinese patent document with publication number CN120127883A and publication date June 10, 2025 discloses a high-power-density marine half-machine permanent magnet shaft generator, which includes a half-machine stator, a half-machine rotor, and a cooling chamber. The outer wall of the half-machine stator is provided with a circulating water channel connected through a cooling water pipe. The upper part of the stator is provided with an air inlet and an air outlet. The cooling chamber is integrated at the top of the generator. The half-machine rotor includes a permanent magnet, a rotor core, a rotor support, and an expansion sleeve. The rotor core is provided with multiple ventilation holes in the axial direction. The generator adopts a mixed cooling system of stator surface water cooling and forced air cooling, and the water cooling channel and the air cooling channel operate independently and cooperatively. Through the design of the generator structure, the stator and the rotor of the generator are fully cooled, the heat dissipation efficiency of the generator is increased, and the power density of the generator is improved. The permanent magnet of the generator rotor is of a tangential structure, which further improves the power density of the generator. The rotor core is provided with ventilation holes in the axial direction, which reduces the weight of the rotor and the influence on the original shaft system of the ship.

[0006] But the above technical scheme, also in half joint no sealing design. SUMMARY

[0007] To solve the above technical problems, the application provides a three-section sleeve joint type half-frame structure of a large high-voltage hydrogen-cooled motor in multiple wind areas, wherein the stator frame is composed of two end covers and a middle half stator, and a combination mode, a sealing structure and a deformation prevention measure of the high-voltage hydrogen-cooled frame are provided, so that the rigidity, strength and sealing performance of the frame are ensured and the transportation bottleneck of a large-capacity unit is solved.

[0008] The application is implemented by using the following technical scheme: A three-section sleeve joint type half-frame structure of a large high-voltage hydrogen-cooled motor in multiple wind areas, comprising a stator frame and end covers for sealing two ends of the stator frame, wherein the end covers are sleeved with the stator frame, the stator frame comprises a middle part and sleeve joint parts at two ends for sleeving with the end covers, the outer diameter of the sleeve joint parts is smaller than that of the middle part, the stator frame comprises an upper half stator frame and a lower half stator frame which are divided into two parts in the horizontal direction and ensure that an inner stator can be hoisted from the upper part, the upper half stator frame and the lower half stator frame are respectively provided with an upper half frame closure plate and a lower half frame closure plate at the parting position, the upper half frame closure plate is provided with a bolt hole for passing through a closure bolt, the lower half frame closure plate is provided with a blind hole matched with the closure bolt, the sleeve joint part is provided with a first ring plate for circumferential closure with the end cover, a sealing cover is arranged between the first ring plate and the middle part of the stator frame to prevent leakage at the sleeve joint position of the end cover and the frame, a gas-tight test joint is arranged on the sealing cover, one end of the lower half frame closure plate and the upper half frame closure plate is provided with a sealing groove one, a rubber strip is arranged in the sealing groove one, the sealing groove one is located between the blind hole and the inside of the frame, and a gas-tight cover is arranged outside the upper half stator frame and the lower half stator frame for secondary sealing at the parting position.

[0009] The end face of the end cover in contact with the first ring plate is provided with a circumferential sealing groove, the diameter of the circumferential sealing groove is smaller than that of the circumferential closure position of the first ring plate and the end cover, and a rubber strip is arranged in the circumferential sealing groove.

[0010] The end of the sealing groove one is in a "C" shape in the horizontal plane, and intersects with the circumferential sealing groove at the "C" shaped curve, so that the rubber strip of the sealing groove one and the rubber strip of the circumferential sealing groove are pressed against each other, and the sealing performance of the parting position of the end cover and the stator frame in the horizontal and circumferential directions is ensured.

[0011] An inclined positioning pin is arranged at the closure position of the first ring plate and the end cover in the circumferential direction.

[0012] One end of the sealing cover is welded with the middle part of the stator frame by a gas-tight welding seam, and the other end is welded with the first ring plate by a gas-tight welding seam.

[0013] One end of the airtight cover is welded with the airtight welding seam of the outer wall of the upper half stator frame, and the other end is welded with the airtight welding seam of the outer wall of the lower half stator frame or the closure plate of the lower half stator frame.

[0014] The upper half stator frame closure plate and the lower half stator frame closure plate are provided with inclined positioning pins in the axial direction for preventing misplacement when the middle section upper and lower half stator frames are reassembled on site, and the inclined positioning pins pass through the upper half stator frame closure plate and the end is located inside the lower half stator frame closure plate.

[0015] The inner walls of the upper half stator frame and the lower half stator frame are provided with a plurality of wind area ring plates for cooperating with the stator and dividing the internal space of the combined stator frame into a plurality of alternating cold air areas and hot air areas.

[0016] One side or both sides of the wind area ring plate at the split part of the upper half stator frame and the lower half stator frame are provided with horizontal reinforcing closure plates.

[0017] The circumferential direction sealing groove is a dovetail-shaped sealing groove.

[0018] The top of the upper half stator frame is externally provided with a hot air duct, and a ventilation hole is arranged at the top of the upper half stator frame to communicate the hot air duct with the hot air area, and the top of the end cover is provided with a cooler package, and the bottom of the lower half stator frame and the end cover is externally provided with a cold air duct, and a ventilation hole is arranged at the bottom of the lower half stator frame to communicate the cold air duct with the cold air area, for forming a gas cooling air path.

[0019] The inner wall of the end cover is provided with an axial rib plate, and the two ends of the axial rib plate are provided with second ring plates, and the second ring plate close to the stator frame is provided with a groove for positioning and cooperating with the end part of the sleeve of the stator frame, and the end cover includes a steam end cover and an excitation end cover.

[0020] Compared with the prior art, the advantages of the present application are: 1. The application splits the large-capacity hydrogen-cooled generator base into upper and lower halves, significantly reducing the weight and size of the single piece for transportation, solving the inland transportation restrictions, and ensuring the symmetry of the structure after splitting, facilitating assembly and stress balance. The upper half base and the lower half base are fixed together by bolts, and the sealing performance at the split part is ensured by a multi-stage sealing system. The sealing groove is arranged between the bolt hole and the inside of the base, directly blocking the path of hydrogen leakage along the split part gap through the bolt hole. The upper half base is a bolt hole, and the lower half base is a blind hole matched with the bolt, reducing the path of hydrogen leakage. The gas-tight cover is gas-tight welded at one end to the outer wall of the upper half base and at the other end to the outer wall of the lower half base or the lower half base, covering the outside of the split joint and forming a closed cavity. Even if there is a slight leak at the split part, hydrogen will be confined in the gas-tight cover. The gas-tight test joint can regularly detect the hydrogen concentration in the cover to achieve early warning of leakage. The end cover is connected to the base in a sleeve connection, providing a large contact area and accurate radial positioning reference, facilitating assembly and effectively transferring part of the load. When assembling large-size components on site, the "plug-in" design of the sleeve connection is easier to operate than the flange face connection, reducing the difficulty and time of aligning large components. The sealing cover is welded to the base body and the first ring plate by gas-tight weld, forming a closed cavity. The gas-tight test joint on it can be used for pressure charging and leak detection, improving safety and facilitating operation.

[0021] 2. The application provides a circumferential sealing groove on the end cover, and the diameter of the circumferential sealing groove is smaller than the diameter of the first ring plate and the circumferential joint position of the end cover, which can avoid hydrogen leakage along the bolt hole gap.

[0022] 3. The application connects the sealing at the split face and the circumferential sealing through a "C" shaped design, which cleverly connects the two rubber strips and eliminates the leakage point at the intersection of horizontal and circumferential sealing, ensuring the reliability of the sealing.

[0023] 4. The application provides a diagonal positioning pin at the joint between the first ring plate and the end cover in the circumferential direction, which further ensures the accurate fixing of the relative position of the end cover and the base in the circumferential direction, prevents the occurrence of circumferential displacement or torsion during operation, and enhances the structural stability and sealing reliability.

[0024] 5. The application welds the sealing cover and the gas-tight cover at both ends to the contact part gas-tight weld, further reducing the risk of hydrogen leakage to the environment.

[0025] 6. The application provides a diagonal positioning pin on the upper half base and the lower half base in the axial direction, which can accurately guide the on-site reassembly of the upper and lower halves, ensure the concentricity and position accuracy, effectively prevent misplacement and deformation, and ensure the assembly quality, providing a good foundation for subsequent sealing.

[0026] 7、The wind area ring plate is provided with a horizontal axial direction reinforcing joint plate on both sides of the split part of the upper half stator frame and the lower half stator frame, an internal framework network is formed, the upper half frame and the lower half frame are connected into one through the reinforcing joint plate, the anti-deformation ability of the frame under high hydrogen pressure is greatly improved, and the sealing failure caused by deformation is prevented.

[0027] 8、The circumferential direction sealing groove is a dovetail-shaped sealing groove, the compression force and the extrusion resistance of the rubber strip can be enhanced, and the sealing performance is improved.

[0028] 9、The wind area ring plate is directly arranged on the inner wall of the frame, and after the subsequent stator is assembled, a plurality of alternating cold and hot air areas can be separated, an effective cooling air path is formed, and the hydrogen gas is ensured to flow in the motor and take away heat.

[0029] 10、The groove on the second ring plate of the end cover is matched with the end part of the frame sleeve, the end cover and the frame are accurately positioned in the axial and radial directions, and the assembly precision is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a three-section sleeve joint type half frame structure diagram of the application; Figure 2 It is a structure diagram of the upper half stator frame and the lower half stator frame of the application; Figure 3 It is a sectional view of E-E; Figure 2 Figure 4 It is an enlarged view of I area; Figure 3 Figure 5 It is a sectional view of H-H; Figure 4 Figure 6 It is an axial schematic view of the three-section sleeve joint type half frame of the application; Figure 7 It is an enlarged view of II area; Figure 6 It is an enlarged view of III area; Figure 8 Figure 1 Figure 9 It is a local schematic view of the joint plate of the upper and lower half frames; Figure 10 It is a schematic view of the cooling air path of the frame; Markings in the figure: ​​​​​1. upper half stator frame; 2. lower half stator frame; 3. end cover; 4. upper half frame jointing plate; 5. lower half frame jointing plate; 6. sealing groove 1; 7. air-tight cover; 8. air-tight test joint; 9. air-tight weld; 10. inclined positioning pin; 11. jointing bolt; 12. sealing cover; 13. circumferential sealing groove; 14. wind area ring plate; 15. reinforced jointing plate; 16. hot air duct; 17. cold air duct; 18. ventilation hole; 19. lifting handle; 20. bottom plate; 21. cooler package; 22. axial rib plate; 23. second ring plate; 24. first ring plate; 25. middle part; 26. sleeve jointing part. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0032] Embodiment 1 As the most basic embodiment of the present application, a three-section sleeve jointing type half-frame structure of a large high-voltage hydrogen-cooled motor with multiple wind areas comprises a stator frame and end covers for sealing the two ends of the stator frame, the end covers 3 are sleeve jointed with the stator frame, the stator frame comprises a middle part 25 and sleeve jointing parts 26 at the two ends for sleeve jointing with the end covers 3, the outer diameter of the sleeve jointing parts 26 is smaller than that of the middle part 25, the stator frame comprises an upper half stator frame 1 and a lower half stator frame 2 which are divided into two halves in the horizontal direction and ensure that the inner stator can be lifted into from the upper part, the upper half stator frame 1 and the lower half stator frame 2 are respectively provided with an upper half frame jointing plate 4 and a lower half frame jointing plate 5 at the division part, the upper half frame jointing plate 4 is provided with bolt holes for the jointing bolts 11 to pass through, the lower half frame jointing plate 5 is provided with blind holes matched with the jointing bolts 11, the sleeve jointing parts 26 are provided with a first ring plate 24 for jointing with the end covers 3 in the circumferential direction, a sealing cover 12 is arranged between the first ring plate 24 and the middle part 25 of the stator frame to prevent leakage at the sleeve jointing part of the end cover 3 and the frame, an air-tight test joint 8 is arranged on the sealing cover 12, one end of the lower half frame jointing plate 5 adhered to the upper half frame jointing plate 4 is provided with a sealing groove 1 6, a rubber strip is arranged in the sealing groove 1 6, and the sealing groove 1 6 is located between the blind hole and the inside of the frame, the upper half stator frame 1 and the lower half stator frame 2 are externally provided with air-tight covers 7 for secondary sealing at the division part.

[0033] This embodiment solves the most fundamental transportation bottleneck and sealing problem of a large high-voltage hydrogen-cooled motor, and uses a sleeve jointing structure and a jointing method to provide the entire half-frame with basic structural integrity, assembly feasibility and preliminary multiple sealing protection under the premise of ensuring sealing.

[0034] Embodiment 2 As a preferred embodiment of the present application, this embodiment is based on the above-mentioned embodiment 1, and further details and elaboration of the technical solutions of the present application are made. In this embodiment, the end face of the end cover 3 in contact with the first ring plate 24 is provided with a circumferential sealing groove 13, the diameter of the circumferential sealing groove 13 is smaller than the diameter of the circumferential joint position of the first ring plate 24 and the end cover 3, and a rubber strip is arranged in the circumferential sealing groove 13. The end of the sealing groove 6 is in a "C" shape in the horizontal plane, and intersects with the circumferential sealing groove 13 at the "C" shaped curve, so that the rubber strips of the sealing groove 6 and the circumferential sealing groove 13 are pressed against each other, ensuring the horizontal and circumferential sealing performance of the joint between the end cover 3 and the stator frame. The first ring plate 24 is provided with a diagonal positioning pin 10 at the joint with the end cover 3 in the circumferential direction. One end of the sealing cover 12 is welded with the middle part 25 of the stator frame by airtight welding, and the other end is welded with the first ring plate 24 by airtight welding; one end of the airtight cover 7 is welded with the outer wall of the upper half frame by airtight welding, and the other end is welded with the outer wall of the lower half frame or the lower half frame joint plate 5 by airtight welding.

[0035] In this embodiment, the reliability and precision of the sealing system are significantly improved. The circumferential sealing groove 13 and the rubber strip are introduced to form a key circumferential seal. The rubber strips of the split face sealing and the circumferential sealing are pressed against each other through the "C" shape design, completely eliminating the leakage risk of the key node. The diagonal positioning pin 10 is added to ensure the accurate circumferential positioning of the end cover 3 and the frame sleeve, preventing misalignment from affecting the sealing, and greatly improving the reliability level of the overall hydrogen sealing.

[0036] Embodiment 3 As another preferred embodiment of the present application, this embodiment is based on the above-mentioned embodiment 2, and further details and elaboration of the technical solutions of the present application are made. In this embodiment, the upper half frame joint plate 4 and the lower half frame joint plate 5 are provided with diagonal positioning pins 10 in the axial direction to prevent misalignment during on-site reassembly of the middle section of the upper and lower half stator frames 2, and the diagonal positioning pins 10 pass through the upper half frame joint plate 4 and the end is located inside the lower half frame joint plate 5.

[0037] This embodiment can accurately guide the on-site reassembly of the upper and lower half frames, ensure the concentricity and positional accuracy, effectively prevent misalignment and deformation, and ensure the assembly quality, providing a good foundation for subsequent sealing.

[0038] Embodiment 4 As another preferred embodiment of the present application, the embodiment is based on the above-mentioned embodiment 3, and further details and elaboration are made to the technical solution of the present application. In the embodiment, the inner walls of the upper half stator frame 1 and the lower half stator frame 2 are provided with a plurality of wind area ring plates 14 for cooperating with the stator and dividing the internal space of the combined frame into a plurality of alternating cold air areas and hot air areas.

[0039] One side or both sides of the wind area ring plate 14 at the split part of the upper half stator frame 1 and the lower half stator frame 2 are provided with a horizontal reinforcing butt joint plate 15.

[0040] The circumferential direction sealing groove 13 is a dove tail sealing groove.

[0041] In the embodiment, the wind area ring plate 14 is provided with a horizontal axial direction reinforcing butt joint plate 15 on both sides of the split part of the upper half stator frame 1 and the lower half stator frame 2, forming an internal framework network, connecting the upper half frame and the lower half frame into one through the reinforcing butt joint plate 15, greatly improving the anti-deformation ability of the frame under high hydrogen pressure, preventing deformation from causing sealing failure, setting the circumferential direction sealing groove 13 as a dove tail shape, and further improving the long-term reliability and safety of the main sealing at the joint under high pressure hydrogen environment by using its excellent rubber strip fixing and anti-extrusion performance.

[0042] Embodiment 5 As the best embodiment of the present application, a multi-wind area large high-pressure hydrogen cooling motor three-section joint type half-frame structure, comprising a stator frame and an end cover 3 for sealing both ends of the stator frame, the end cover 3 is jointed with the stator frame, the stator frame comprises an intermediate part 25 and two end joint parts 26 for jointing with the end cover 3, the outer diameter of the joint part 26 is smaller than the intermediate part 25, the stator frame comprises an upper half stator frame 1 and a lower half stator frame 2 which are split into two parts in the horizontal direction and ensure that the inner stator can be lifted from the upper part, the upper half stator frame 1 and the lower half stator frame 2 are respectively provided with an upper half frame butt joint plate 4 and a lower half frame butt joint plate 5 at the split part, the upper half frame butt joint plate 4 is provided with a bolt hole for the butt joint bolt 11 to pass through, the lower half frame butt joint plate 5 is provided with a blind hole matched with the butt joint bolt 11, the joint part 26 is provided with a first ring plate 24 for jointing with the end cover 3 in the circumferential direction, a sealing cover 12 is arranged between the first ring plate 24 and the intermediate part 25 of the stator frame to prevent leakage at the joint of the end cover 3 and the frame, a gas tightness test joint 8 is arranged on the sealing cover 12, one end of the lower half frame butt joint plate 5 abutting with the upper half frame butt joint plate 4 is provided with a sealing groove one 6, a rubber strip is arranged in the sealing groove one 6, the sealing groove one 6 is located between the blind hole and the internal part of the frame, and a gas tight cover 7 is arranged outside the upper half stator frame 1 and the lower half stator frame 2 for secondary sealing at the split part.

[0043] The end face of the end cover 3 in contact with the first ring plate 24 is provided with a circumferential sealing groove 13, the diameter of which is smaller than that of the circumferential joint position of the first ring plate 24 and the end cover 3, and a rubber strip is arranged in the circumferential sealing groove 13.

[0044] The end of the sealing groove 6 is in the shape of a "C" in the horizontal plane, and intersects with the circumferential sealing groove 13 at the curve of the "C", so that the rubber strips of the sealing groove 6 and the circumferential sealing groove 13 press against each other, ensuring the horizontal and circumferential sealing performance of the joint between the end cover 3 and the stator frame.

[0045] The first ring plate 24 is provided with a diagonal positioning pin 10 at the joint with the end cover 3 in the circumferential direction.

[0046] The sealing cover 12 is welded by airtight welding at one end to the middle part 25 of the stator frame and at the other end to the first ring plate 24.

[0047] The airtight cover 7 is welded by airtight welding at one end to the outer wall of the upper half frame and at the other end to the outer wall of the lower half frame or the joint plate 5 of the lower half frame.

[0048] The upper half frame joint plate 4 and the lower half frame joint plate 5 are provided with diagonal positioning pins 10 in the axial direction to prevent misalignment during on-site reassembly of the upper and lower half stator frames 2, the diagonal positioning pins 10 pass through the upper half frame joint plate 4 and the ends are located inside the lower half frame joint plate 5, and the diagonal direction of the diagonal positioning pins is from the left end to the right end for the left end diagonal positioning pin and from the right end to the left end for the right end diagonal positioning pin.

[0049] The inner walls of the upper half stator frame 1 and the lower half stator frame 2 are provided with a plurality of air zone rings 14 for cooperating with the stator and dividing the internal space of the assembled frame into a plurality of alternating cold air zones and hot air zones.

[0050] The air zone rings 14 at the joint of the upper half stator frame 1 and the lower half stator frame 2 are provided with horizontal reinforcing joint plates 15 on one side or both sides.

[0051] The circumferential sealing groove 13 is a dovetail-shaped sealing groove.

[0052] The upper half stator frame 1 is provided with a hot air duct 16 on the top, and a ventilation hole 18 is arranged on the top of the upper half stator frame 1 to communicate the hot air duct 16 with the hot air zone, the end cover 3 is provided with a cooler package 21 on the top, the lower half frame and the end cover 3 are provided with a cold air duct 17 on the bottom, and a ventilation hole 18 is arranged on the bottom of the lower half stator frame 2 to communicate the cold air duct 17 with the cold air zone, for forming a gas cooling air path.

[0053] The inner wall of the end cover 3 is provided with an axial rib plate 22, the two ends of the axial rib plate 22 are provided with a second ring plate 23, the second ring plate 23 close to the stator frame is provided with a groove for positioning and matching with the end part 26 of the sleeve of the stator frame, and the end cover 3 includes a steam end cover 3 and an excitation end cover 3.

[0054] The embodiment proposes a three-section sleeve joint type half-frame structure of a high-voltage hydrogen-cooled generator in multiple wind areas, that is, the stator frame is composed of two end covers 3 and a middle-section half stator frame, specifically, the stator frame is composed of a steam end cover 3, an excitation end cover 3, an upper half stator frame 1, a lower half stator frame 2, an end cover 3 top cooler package 21 and the like. The steam end cover 3 and the excitation end cover 3 are composed of a ring plate, a rib plate, a cold air duct, an air inlet duct and the like, and the upper and lower half stator frames 2 are composed of a welded shell structure of a wind area ring plate 14, a hot air duct 16, a cold air duct 17, a ventilation hole 18, a bottom plate, a lifting bar 19 and the like. The wind area ring plate 14 divides the middle-section stator into multiple sections, the cold air duct 16 and the hot air duct 16 are external air ducts of the middle-section stator, and cooperate with the ventilation hole 18 to form a gas cooling air duct, thereby meeting the cooling requirements of the generator in multiple wind areas.

[0055] The structure and cooling air path of the embodiment are shown in the accompanying drawings Figure 10 Hydrogen is driven by the axial flow fans installed at the two ends of the rotor to cool the generator in three ways: 1. Cold air is blown into the cold air cover duct of the steam end cover 3 and the excitation end cover 3 of the lower part of the frame by the fan, the cold air cover of the end cover 3 is connected with the cold air cover of the lower half frame, the hydrogen in the cold air cover enters the back of the iron core through the ventilation hole 18 of the frame outer skin, and then enters the air gap after cooling the iron core in the radial air duct of the iron core, a small part of the hydrogen enters the air duct in the rotor slot to cool the rotor winding, and the other part of the hydrogen is folded back to cool the iron core in the outflow area, and finally enters the two hot air ducts at the top of the upper half frame through the ventilation hole 18 of the frame outer skin, the hot air duct of the frame is connected with the hot air duct of the end cover 3, and the cooled hot air enters the cooler at the top of the end cover 3; 2. Cold air is blown into the air gap by the fan to cool the end part of the stator iron core; 3. Cold air cools the end part of the rotor coil, enters the air gap, enters the hot air duct after cooling the end part of the iron core, and then enters the cooler. The hydrogen cooled by the cooler enters the fan in front of it for recirculation. The alternating in-and-out radial multi-flow ventilation ensures uniform cooling of the generator iron core and winding, and reduces thermal stress and local overheating of the structure.

Claims

1. A three-section sleeved half-frame structure for a large high-pressure hydrogen-cooled motor with multiple wind zones, comprising a stator frame and end covers (3) for sealing both ends of the stator frame, characterized in that: The end cover (3) is sleeved with the stator frame. The stator frame includes a middle part (25) and sleeved parts (26) at both ends for sleeved with the end cover (3). The outer diameter of the sleeved parts (26) is smaller than that of the middle part (25). The stator frame includes an upper stator frame (1) divided into two halves in the horizontal direction and a lower stator frame (2) to ensure that the inner stator can be hoisted in from the top. The upper stator frame (1) and the lower stator frame (2) are respectively provided with an upper stator frame clamping plate (4) and a lower stator frame clamping plate (5) at the split point. The upper stator frame clamping plate (4) is provided with bolt holes for the clamping bolts (11) to pass through, and the lower stator frame clamping plate (5) is provided with blind holes that cooperate with the clamping bolts (11). The socket portion (26) is provided with a first ring plate (24) for engaging with the end cover (3) in the circumferential direction. A sealing cover (12) is provided between the first ring plate (24) and the middle part (25) of the stator frame to prevent leakage at the socket of the end cover (3) and the frame. An airtight test joint (8) is provided on the sealing cover (12). A sealing groove (6) is provided at one end of the lower frame engagement plate (5) and the upper frame engagement plate (4). A rubber strip is provided in the sealing groove (6). The sealing groove (6) is located between the blind hole and the inside of the frame. An airtight cover (7) for secondary sealing of the split part is provided outside the upper stator frame (1) and the lower stator frame (2).

2. The three-section sleeved half-frame structure of a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 1, characterized in that: The end face of the end cover (3) that contacts the first ring plate (24) is provided with a circumferential sealing groove (13). The diameter of the circumferential sealing groove (13) is smaller than the diameter of the circumferential engagement position of the first ring plate (24) and the end cover (3). A rubber strip is provided in the circumferential sealing groove (13).

3. The three-section socketed split-frame structure for a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 2, characterized in that: The end of the sealing groove (6) is C-shaped in the horizontal plane and intersects with the circumferential sealing groove (13) at the C-shaped curve, so that the rubber strip of the sealing groove (6) and the rubber strip of the circumferential sealing groove (13) are squeezed against each other, ensuring the sealing performance of the end cover (3) and the stator base sleeve at the split in the horizontal and circumferential directions.

4. The three-section socketed split-frame structure for a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 3, characterized in that: An oblique positioning pin (10) is provided along the circumferential direction at the junction of the first ring plate (24) and the end cover (3).

5. The three-section sleeved half-frame structure for a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 4, characterized in that: One end of the sealing cover (12) is welded to the airtight weld of the middle part (25) of the stator frame, and the other end is welded to the airtight weld of the first ring plate (24).

6. The three-section sleeved half-frame structure of a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 5, characterized in that: One end of the airtight cover (7) is welded to the airtight weld of the outer wall of the upper half of the machine base, and the other end is welded to the airtight weld of the outer wall of the lower half of the machine base or the lower half of the machine base assembly plate (5).

7. The three-section socketed split-frame structure for a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 6, characterized in that: The upper half of the machine base assembly plate (4) and the lower half of the machine base assembly plate (5) are provided with oblique positioning pins (10) in the axial direction to prevent misalignment of the upper and lower half stator machine bases (2) during on-site reassembly. The oblique positioning pins (10) pass through the upper half of the machine base assembly plate (4) and their ends are located inside the lower half of the machine base assembly plate (5).

8. A three-section sleeved split-frame structure for a large high-pressure hydrogen-cooled motor with multiple wind zones according to any one of claims 1-7, characterized in that: The inner walls of the upper stator frame (1) and the lower stator frame (2) are provided with several air zone ring plates (14) for cooperating with the stator and dividing the internal space of the assembled frame into multiple cold air zones and hot air zones.

9. The three-section sleeved half-frame structure of a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 8, characterized in that: The wind zone ring plate (14) at the split of the upper stator frame (1) and the lower stator frame (2) is provided with a horizontal reinforcing plate (15) on one or both sides.

10. The three-section sleeved half-frame structure of a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 9, characterized in that: The circumferential sealing groove (13) is a dovetail-shaped sealing groove.

11. The three-section sleeved half-frame structure of a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 9, characterized in that: The upper stator frame (1) is provided with a hot air duct (16) on the outside of the top, and a ventilation hole (18) is provided on the top of the upper stator frame (1) to connect the hot air duct (16) with the hot air zone. The end cover (3) is provided with a cooler package (21) on the top. The lower frame and the end cover (3) are provided with a cold air duct (17) on the outside of the bottom, and a ventilation hole (18) is provided on the bottom of the lower stator frame (2) to connect the cold air duct (17) with the cold air zone, so as to form a gas cooling air path.

12. The three-section sleeved half-frame structure of a large high-pressure hydrogen-cooled motor with multiple wind zones according to claim 1, characterized in that: The inner wall of the end cover (3) is provided with an axial stiffener (22), and the two ends of the axial stiffener (22) are provided with a second ring plate (23). The second ring plate (23) near the stator frame is provided with a groove for positioning and cooperating with the end of the sleeve part (26) of the stator frame. The end cover (3) includes a steam end cover and an excitation end cover.

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