Upper and lower half engine base of high-pressure hydrogen-cooled generator with multiple wind areas

Abstract

The invention discloses a multi-wind-area high-pressure hydrogen-cooled generator upper and lower half engine base, which relates to the technical field of hydrogen-cooled generators and comprises an upper half stator engine base, a lower half stator engine base and end covers used for sealing two ends of the stator engine base. 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 position, the upper half base combining plate is provided with a bolt hole for a combining bolt to penetrate through, and the lower half base combining plate is provided with a blind hole matched with the combining bolt. An airtight cover is arranged outside the upper half stator base and the lower half stator base, an airtight experiment connector is arranged on the airtight cover, one end of the airtight cover is welded to an airtight welding seam of the outer wall of the upper half stator base, and the other end of the airtight cover is welded to an airtight welding seam of the outer wall of the lower half stator base. And the other end is welded with the outer wall of the lower half engine base or the lower half engine base closing plate through an airtight welding seam. 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] This invention relates to the field of hydrogen-cooled generator technology, specifically to a multi-zone high-pressure hydrogen-cooled generator with a split upper and lower frame. Background Technology

[0002] The stator frame is a welded steel plate shell structure with sufficient strength and rigidity. Its function is to support the stator core and stator coils and form a specific cooling gas flow channel. For air-cooled generators, because the requirements for internal sealing are not high and the internal and external pressures of the generator are basically the same, some air-cooled generators use a split-frame. For hydrogen-cooled generators, the frame, as a sealed container for hydrogen, must be able to withstand the impact of an accidental hydrogen explosion inside the generator. Large high-pressure hydrogen-cooled generators use a welded steel plate shell structure for their frame, possessing sufficient strength and rigidity. Its function is to support the stator core and stator coils and form a specific cooling gas flow channel. For hydrogen-cooled generators, the hydrogen pressure in the generator can reach 0.3-0.6 MPa. As a sealed container for hydrogen, the frame must also be able to withstand the impact of an accidental hydrogen explosion inside the generator. Therefore, the frame of a hydrogen-cooled generator requires both sufficient strength and rigidity to prevent damage and deformation caused by high hydrogen pressure, and must ensure the frame's sealing to prevent hydrogen leakage. As generator capacity continues to increase, the size and weight of generators also increase, especially in inland areas where the transportation of generator stators restricts the development of generator capacity. Existing hydrogen-cooled generators use a frame made of integral welded steel plates.

[0003] Chinese patent document CN1822475A, published on August 23, 2006, discloses a split-frame motor structure, including a frame and two end covers. Its key feature is that the frame consists of an upper and a lower section, with the upper section being thinner than the lower section. The two end covers are fixed to the two ends of the lower section. The advantages of this invention are: it significantly reduces the amount of thick steel plate used for welding the frame and end covers, greatly lowering raw material costs; it facilitates inspection, maintenance, and repair; it provides good ventilation and cooling; and it improves motor performance.

[0004] However, the above technical solution has insufficient structural strength and lacks a sealed design for the split joint, resulting in hydrogen leakage along the joint radially.

[0005] Chinese patent application CN120127883A, published on June 10, 2025, discloses a high-power-density marine split-type permanent magnet shaft-driven generator, comprising a split-type stator, a split-type rotor, and a cooling chamber. The outer wall of the split-type stator's base is equipped with circulating water channels connected by cooling water pipes. Air inlets and outlets are located at both ends of the upper part of the base. The cooling chamber is integrated into the top of the generator. The split-type rotor includes permanent magnets, a rotor core, a rotor support, and a shrink sleeve. Multiple ventilation holes are arranged along the axial direction of the rotor core. The generator employs a hybrid cooling system combining stator surface water cooling and forced air cooling, with the water-cooling and air-cooling channels operating independently yet coordinating for heat dissipation. Through the generator's structural design, both the stator and rotor are adequately cooled, increasing the generator's heat dissipation efficiency and power density. The tangential structure of the rotor's permanent magnets further enhances the generator's power density. The axial addition of ventilation holes to the rotor core reduces rotor weight and minimizes the impact on the ship's existing shafting system.

[0006] However, the above technical solutions also have a design without a seal at the split joint. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention proposes a multi-zone high-pressure hydrogen-cooled generator with a split-frame structure, consisting of an upper stator frame and a lower stator frame. It also outlines a high-pressure hydrogen-cooled frame assembly method, a sealing structure, and anti-deformation measures. This ensures the frame's rigidity, strength, and sealing performance while resolving the transportation bottleneck of large-capacity generator units.

[0008] This invention is achieved using the following technical solution: A multi-zone high-pressure hydrogen-cooled generator with a split frame includes an upper stator frame, a lower stator frame, and end caps for sealing both ends of the stator frame. The upper and lower stator frames are respectively provided with an upper frame retaining plate and a lower frame retaining plate at the split points. The upper frame retaining plate has bolt holes for retaining bolts to pass through, and the lower frame retaining plate has blind holes for engaging the retaining bolts. The lower frame retaining plate engages with the upper frame retaining plate. A sealing groove is provided at one end of the plate bonding. A rubber strip or sealant is provided in the sealing groove. The sealing groove is located between the blind hole and the machine base. An airtight cover for secondary sealing of the split section is provided outside the upper and lower stator machine bases. An airtight test joint is provided on the airtight cover. One end of the airtight cover is welded to the airtight weld of the outer wall of the upper machine base, and the other end is welded to the airtight weld of the outer wall of the lower machine base or the bonding plate of the lower machine base.

[0009] Both ends of the upper stator base and the lower stator base are provided with end plates for fixing to the end cover. The end plates are provided with circumferential sealing grooves to ensure circumferential sealing between the base and the end cover, and rubber sealing strips are provided in the grooves.

[0010] The end cover is provided with an "S"-shaped sealing groove at the same plane position as the stator frame split, and a rubber sealing strip is provided in the "S"-shaped sealing groove. The circumferential sealing groove is a sealing groove one on one side of the stator frame split and an "S"-shaped protrusion of the "S"-shaped sealing groove on the other side, so that the rubber sealing strip or sealant in the three sealing grooves compresses each other, ensuring the horizontal and circumferential sealing performance of the end cover and the stator frame split.

[0011] The upper and lower half of the base plate includes two side portions parallel to the axis and two end portions perpendicular to the axis. The side portions parallel to the axis are provided with oblique positioning pins to prevent deformation of the upper and lower half of the base. The oblique positioning pins are symmetrically arranged on the other side portion parallel to the axis.

[0012] The end cover is fixedly connected to the combined end plate of the stator frame formed by combining the bolts with the end plate of the upper half frame and the end plate of the lower half frame. The radius of the circumference where the bolt is located is greater than the radius of the circumference where the sealing groove is located.

[0013] The inner walls of the upper and lower stator frames are provided with several air zone ring plates that cooperate with the stator and divide the internal space of the assembled frame into multiple alternating cold air zones and hot air zones.

[0014] Both sides of the wind zone ring plate at the split of the upper and lower stator frame are provided with horizontally axially reinforcing clamping plates. Between the wind zone ring plates at the beginning and end and the end plates at the beginning and end, there is an inner end cover clamping ring plate for clamping with the inner end cover. Between the inner end cover clamping ring plate and the end plate at the split, there is a horizontally axially reinforcing clamping plate. The reinforcing clamping plates of the upper and lower stator frame are connected as one piece by clamping bolts and vertical positioning pins to improve the rigidity of the upper and lower frame, increase the resistance to deformation under high hydrogen pressure after the frame is clamped, and prevent hydrogen leakage from the generator.

[0015] The upper and lower half of the machine base assembly plates are welded together with an airtight weld at the contact gap.

[0016] The first sealing groove is a dovetail-shaped sealing groove.

[0017] The upper stator base and the lower stator base are welded with hot air ventilation hoods and cold air ventilation hoods on their outer walls. Ventilation holes corresponding to the cold air zone and the hot air zone are respectively provided on the outer walls of the upper stator base and the lower stator base in the corresponding areas of the hot air ventilation hood and the cold air ventilation hood, so as to form a gas cooling air path.

[0018] A wire outlet cover is welded to the outer wall of the lower stator base.

[0019] The top of the upper stator frame is equipped with a cooler package that, together with the hot air hood, cold air hood, and ventilation holes, forms a cooling air path.

[0020] Compared with the prior art, the advantages of the present invention are as follows: 1. This invention splits the large-capacity hydrogen-cooled generator base into upper and lower halves, significantly reducing the weight and size of each component for transport, overcoming inland transportation limitations. The split position is near the horizontal center line, ensuring structural symmetry after splitting, facilitating assembly and stress balance. The upper and lower halves of the base are fixed together with bolts, and a multi-stage sealing system ensures sealing performance at the split. A sealing groove is placed between the blind hole and the interior of the base, directly preventing hydrogen leakage through the bolt holes along the split gap. The upper half of the base has bolt holes, while the lower half has blind holes that mate with the bolts, reducing the path for hydrogen leakage. Furthermore, an airtight cover is constructed, with one end welded to the airtight weld of the upper half of the base and the other end welded to the airtight weld of the lower half of the base or the lower half's handle plate. This airtight cover covers the outside of the segmented joint, forming a sealed cavity. Even if there is a slight leak at the segmented joint, the hydrogen will be confined within the airtight cover. The airtightness test joint can be used to independently test the welding quality of the airtight weld at the airtight cover.

[0021] 2. In this invention, the circumferential sealing groove on the end plate can ensure the seal between the base and the end cover. Arranging the bolts on the outside of the circumferential sealing groove can prevent hydrogen from leaking along the bolt hole gaps.

[0022] 3. In this invention, an "S"-shaped sealing groove is provided on the end cover at the same plane position as the stator base split. A rubber sealing strip is provided in the "S"-shaped sealing groove. At the split, the sealing groove, the circumferential sealing groove and the "S"-shaped sealing groove are coupled to a point, so that the three sealing rubber / strips are compressed synchronously during assembly. On the one hand, a continuous sealing force chain is formed to avoid local sealing failure; on the other hand, the mutual compression of the three can ensure that the sealing surface is continuously in contact, with strong dynamic sealing compensation capability, ensuring the sealing performance in the horizontal direction and the vertical circumferential direction at the connection, and improving the reliability of the seal.

[0023] 4. This invention, by setting oblique positioning pins and vertical positioning pins on the upper and lower half of the stator frame assembly plates, can prevent misalignment of the upper and lower half stator frames during on-site reassembly, thus preventing the generator's overall sealing performance from being affected and significantly improving the overall rigidity of the assembled half-frames.

[0024] 5. In this invention, the wind zone ring plate is provided with horizontally axially reinforcing clamping plates on both sides of the split points of the upper and lower stator bases. The inner end cover clamping ring plate and the end plate are provided with horizontally axially reinforcing clamping plates at the split points, forming an internal skeleton network. The reinforcing clamping plates of the upper and lower bases are connected as one unit by clamping bolts and vertical positioning pins, which greatly improves the deformation resistance of the base under high hydrogen pressure and prevents sealing failure due to deformation.

[0025] 6. In this invention, the upper half of the machine base and the lower half of the machine base are welded together with an airtight weld at the contact gap, which can further ensure the sealing performance of the machine base.

[0026] 7. In this invention, the sealing groove is a dovetail-shaped sealing groove, which can enhance the compressive force and anti-extrusion ability of the rubber strip / sealant, and improve the sealing performance.

[0027] 8. In this invention, the ventilation hood is set on the outer wall of the base and directly corresponds to the cold / hot air zones divided by the internal air zone ring plate, forming an efficient gas flow channel. The cooler package is set on the top of the base, which can improve the cooling efficiency. The cable outlet cover is welded to the lower half of the base, which can meet the actual cable layout requirements and reduce the complexity of the wiring. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the upper and lower split base of the present invention; Figure 2 This is a partial schematic diagram of the sealing between the base and the end cover of the present invention; Figure 3 for Figure 2 Enlarged view of area (I); Figure 4 for Figure 2 Enlarged view of area (II); Figure 5 for Figure 4 Enlarged view of the middle (IIII) region; Figure 6 This is an axial schematic diagram of the upper and lower split bases of the present invention after assembly; Figure 7 for Figure 6 Enlarged view of area (III); Figure 8 for Figure 1 Sectional view of AA; Figure 9 for Figure 2 BB section view; Marked in the image: 1. Upper stator base; 2. Lower stator base; 3. End cover; 4. Upper base assembly plate; 5. Lower base assembly plate; 6. Sealing groove 1; 7. Airtight hood; 8. Airtight test joint; 9. Airtight weld; 10. Angled positioning pin; 11. Assembly bolt; 12. End plate; 13. Circumferential sealing groove; 14. "S" shaped sealing groove; 15. Air zone ring plate; 16. Reinforced assembly plate; 17. Inner end cover assembly ring plate; 18. Vertical positioning pin; 19. Hot air ventilation hood; 20. Cold air ventilation hood; 21. Ventilation hole; 22. Cable outlet cover; 23. Hanging bracket; 24. Base plate; 25. Air zone partition plate; 26. Hoop ring; 27. Support ring; 28. Tangential spring plate; 29. ​​Manhole door. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1 As the most basic embodiment of the present invention, refer to Figure 1 A multi-zone high-pressure hydrogen-cooled generator with a split frame includes an upper stator frame 1, a lower stator frame 2, and end caps 3 for sealing both ends of the stator frame. The upper stator frame 1 and the lower stator frame 2 are respectively provided with an upper frame clamping plate 4 and a lower frame clamping plate 5 at the split points. The upper frame clamping plate 4 has bolt holes for clamping bolts 11 to pass through, and the lower frame clamping plate 5 has blind holes for mating with the clamping bolts 11. Plate 5 is provided with a sealing groove 6, and a rubber strip or sealant is provided in the sealing groove 6. The sealing groove 6 is located between the blind hole and the inside of the base. An airtight cover 7 for secondary sealing of the split section is provided on the outside of the upper half stator base 1 and the lower half stator base 2. An airtight test joint 8 is provided on the airtight cover 7. One end of the airtight cover 7 is welded to the airtight weld of the outer wall of the upper half base, and the other end is welded to the outer wall of the lower half base or the airtight weld of the lower half base plate 5.

[0031] In this embodiment, a physical isolation barrier is constructed at the joint of the split-type generator base through the sealing design of the sealing groove 6 and the airtight cover 7. The rubber strip inside the sealing groove directly blocks the leakage path of hydrogen along the bolt holes. The external airtight cover 7 is welded to form a secondary sealed cavity and equipped with a detection connector to achieve real-time leakage monitoring. This structure enables the split-type generator base to meet the high-pressure hydrogen sealing requirements, while reducing the weight of a single component during transportation and overcoming the bottleneck of inland transportation of large-capacity units.

[0032] Example 2 As a preferred embodiment of the present invention, this embodiment is a further detailed supplement and explanation of the technical solution of the present invention based on the above embodiment 1, referring to... Figures 1-3 In this embodiment, both ends of the upper stator base 1 and the lower stator base 2 are provided with end plates 12 for fixing to the end cover 3; the end plates 12 are provided with circumferential sealing grooves 13 for ensuring circumferential sealing between the base and the end cover 3, and rubber sealing strips are provided in the grooves; the end cover 3 is fixedly connected to the combined end plate of the stator base formed by the combination of the upper and lower bases by bolts, and the radius of the circumference of the bolt is larger than the radius of the circumference of the circumferential sealing groove 13.

[0033] In this embodiment, the circumferential sealing groove 13 on the end plate 12 can ensure the seal between the base and the end cover 3. Arranging the bolts on the outside of the circumferential sealing groove 13 can prevent hydrogen from leaking along the bolt hole gap.

[0034] Example 3 As another preferred embodiment of the present invention, this embodiment is based on the above-described embodiment 2, and further supplements and elaborates on the technical solution of the present invention. (Refer to...) Figures 1-3 In this embodiment, the end cover 3 is provided with an "S"-shaped sealing groove 14 at the same plane position as the stator frame split, and a rubber sealing strip is provided in the "S"-shaped sealing groove 14. The circumferential sealing groove 13 is a sealing groove 6 on one side of the stator frame split and an "S"-shaped protrusion of the "S"-shaped sealing groove 14 on the other side, so that the rubber sealing strips or sealant in the three sealing grooves are compressed against each other, ensuring the sealing performance of the end cover 3 and the stator frame split.

[0035] In this embodiment, the forced coupling between the "S"-shaped sealing groove protrusion of the end cap 3 and the sealing groove 6 of the base and the circumferential sealing groove enables the three sealing strips to be compressed synchronously during assembly, forming a dynamic pressure closed loop and improving the reliability of the seal.

[0036] Example 4 As another preferred embodiment of the present invention, this embodiment is a further detailed supplement and explanation of the technical solution of the present invention based on the above embodiment 3, referring to... Figures 1-3 In this embodiment, the upper half of the base plate 4 and the lower half of the base plate 5 include two side portions parallel to the axis and two end portions perpendicular to the axis. The side portions parallel to the axis are provided with oblique positioning pins 10 for preventing deformation of the upper and lower half of the base. The oblique positioning pins 10 are symmetrically arranged on the other side portion parallel to the axis.

[0037] In this embodiment, oblique positioning pins 10 are symmetrically arranged on the side of the split-type base plate. The oblique angle generates a horizontal shear force, which effectively resists the joint misalignment deformation caused by high hydrogen pressure, improves the structural stability under high hydrogen pressure environment, and significantly enhances the overall rigidity of the split-type base after assembly.

[0038] Example 5 As a preferred embodiment of the present invention, refer to Figures 1-3 A multi-zone high-pressure hydrogen-cooled generator with a split frame includes an upper stator frame 1, a lower stator frame 2, and end caps 3 for sealing both ends of the stator frame. The upper stator frame 1 and the lower stator frame 2 are respectively provided with an upper frame clamping plate 4 and a lower frame clamping plate 5 at the split points. The upper frame clamping plate 4 has bolt holes for clamping bolts 11 to pass through, and the lower frame clamping plate 5 has blind holes that mate with the clamping bolts 11. A sealing groove 6 is provided with a rubber strip or filled with sealant. The sealing groove 6 is located between the blind hole and the inside of the machine base. An airtight cover 7 for secondary sealing of the split section is provided outside the upper half stator machine base 1 and the lower half stator machine base 2. An airtight test joint 8 is provided on the airtight cover 7 for testing the airtight weld 9. One end of the airtight cover 7 is welded to the airtight weld of the outer wall of the upper half machine base, and the other end is welded to the airtight weld of the outer wall of the lower half machine base or the lower half machine base composite plate 5.

[0039] The upper half of the machine base handle plate 4 and the lower half of the machine base handle plate 5 include two side portions parallel to the axis and two end portions perpendicular to the axis. The side portions parallel to the axis are provided with oblique positioning pins 10 for preventing deformation of the upper and lower half of the machine base. The oblique positioning pins 10 are symmetrically arranged on the other side portion parallel to the axis.

[0040] Both ends of the upper stator frame 1 and the lower stator frame 2 are provided with end plates 12 for fixing to the end cover 3.

[0041] To ensure a seal between the upper and lower split machine base and the end cover 3 in the circumferential direction, the end plate 12 is provided with a circumferential sealing groove 13 to ensure a seal between the machine base and the end cover 3 in the circumferential direction, and a rubber sealing strip is provided in the groove.

[0042] The end cover 3 is fixedly connected to the combined end plate of the stator frame formed by the combination of the upper half frame and the lower half frame by bolts. The radius of the circumference where the bolt is located is greater than the radius of the circumference where the sealing groove 13 is located.

[0043] To ensure the sealing between the base and end cover 3, both the horizontal seam sealing and the circumferential sealing of the base and end cover 3 must be considered. (See...) Figure 3The base and end cover 3 are sealed. To ensure the seal between the base and the middle seam of the end cover 3, the end cover 3 is provided with an "S"-shaped sealing groove 14 at the same plane position as the stator base split, and a rubber sealing strip is provided in the "S"-shaped sealing groove 14. The circumferential sealing groove 13 is a sealing groove 6 on one side at the stator base split, and an "S"-shaped protrusion of the "S"-shaped sealing groove 14 on the other side, so that the rubber sealing strip or sealant in the three sealing grooves compresses each other, ensuring the sealing performance of the end cover 3 and the stator base split.

[0044] The inner walls of the upper stator frame 1 and the lower stator frame 2 are provided with several air zone ring plates 15 for cooperating with the stator and dividing the internal space of the assembled frame into multiple alternating cold air zones and hot air zones.

[0045] To improve the rigidity of the upper and lower stator frames and enhance their resistance to deformation under high hydrogen pressure after assembly, thus preventing hydrogen leakage from the generator, horizontally axially reinforcing clamping plates 16 are provided on both sides of the air zone ring plate 15 at the split of the upper stator frame 1 and the lower stator frame 2. An inner end cover clamping ring plate 17 is provided between the air zone ring plate 15 at the beginning and end and the corresponding end plate 12 for clamping with the inner end cover. A horizontally axially reinforcing clamping plate 16 is provided between the inner end cover clamping ring plate 17 and the end plate 12 at the split. Furthermore, to prevent misalignment during on-site reassembly of the upper and lower stator frames 2, which could affect the overall sealing of the generator, the reinforcing clamping plates 16 of the upper stator frame 1 and the lower stator frame 2 are connected as a single unit by clamping bolts 11 and vertical positioning pins 18. This connection enhances the rigidity of the upper and lower stator frames, increases their resistance to deformation under high hydrogen pressure after assembly, and prevents hydrogen leakage from the generator.

[0046] The upper half of the machine base assembly plate 4 and the lower half of the machine base assembly plate 5 are welded together with an airtight weld at the contact gap.

[0047] The sealing groove 6 is a dovetail-shaped sealing groove.

[0048] The upper stator frame 1 and the lower stator frame 2 are welded to the outer walls of the upper stator frame 1 and the lower stator frame 2, respectively, and ventilation holes 21 corresponding to the cold air zone and the hot air zone are respectively provided on the outer walls of the upper stator frame 1 and the lower stator frame 2 in the corresponding areas of the hot air ventilation hood 19 and the cold air ventilation hood 20, so as to form a gas cooling air path.

[0049] A wire outlet cover 22 is welded to the outer wall of the lower stator base 2.

[0050] The top of the upper stator frame 1 is provided with a cooler package for forming a cooling air path together with the hot air ventilation hood 19, the cold air ventilation hood 20 and the ventilation hole 21.

[0051] This embodiment divides the large high-pressure hydrogen-cooled generator frame into upper and lower halves, forming a shell structure through end plates 12, ring plates, and connecting plates, which meets the requirements for frame strength and rigidity and prevents generator deformation. Dividing the generator frame into upper and lower halves meets the requirements for stator transportation after the generator is enlarged. The double-layer sealing structure of the upper and lower halves of the stator frame, the sealing structure between the horizontal half end cover 3 and the frame, and the sealing structure between the upper and lower halves of the frame and the end cover 3 in the circumferential direction ensure the airtightness of the generator frame. Multiple sets of locating pins ensure accurate repositioning of the frame after processing and avoid misalignment of the upper and lower halves of the frame.

[0052] The upper stator frame 1 in this embodiment also includes a manhole 29 for assembling the inner and outer stators; the lower stator frame 2 also includes a hanging bracket 23, a generator base plate 24, etc.; the stator frame serves as the main ventilation path for the generator, and is divided into multiple hot and cold air zones. Ventilation holes 21 are opened at the hot and cold air zones on the outer skin of the upper and lower stator frames. The ventilation holes 21 and the ventilation ducts cooperate to form a gas cooling air duct, which meets the cooling needs of the generator in multiple air zones. The ventilation holes 21 at the bottom of the lower frame connect the various cold zones, and the hot air ducts and outer skin ventilation holes 21 at the top of the upper frame connect the various hot air zones. The hot air eventually converges into the end hot air zone and then enters the cooler through the cooler package at the top of the upper frame to be cooled into cold air. Specifically: 1. Cold air is blown into the lower cold air ventilation hood 20 by the fan. The hydrogen in the cold air ventilation hood 20 enters the back of the iron core through the outer skin ventilation holes 18 of the frame. After cooling the iron core in the air intake zone along the radial air duct of the iron core, it enters the air gap. A small portion of the hydrogen enters the air duct in the rotor slot to cool the rotor winding. Most of the other hydrogen then returns to the iron core to cool the iron core in the air outlet zone. Finally, it enters the two hot air ventilation hoods 19 at the top of the upper frame through the outer skin ventilation holes 18 of the frame and then enters the cooler package at the top; 2. Cold air is blown into the air gap by the fan to cool the iron core at the end of the stator; 3. After cooling the coil at the end of the rotor, the cold air enters the air gap, cools the iron core at the end, and then enters the hot air ventilation hood and then the cooler. The hydrogen gas, cooled by the cooler, is recirculated before entering the fan. This alternating radial multi-flow ventilation ensures uniform cooling of the generator core and windings, reducing thermal stress on structural components and localized overheating.

[0053] In this embodiment, the steps for assembling the inner and outer stators are as follows: (a) The upper and lower halves of the frame are assembled separately, and the air zone partitions 25, hoop rings 26, and support rings 27 for each air zone are installed. Large-capacity water-hydrogen cooled generator stators mostly adopt multi-flow ventilation cooling. The stator frame corresponds to the stator core air zone and needs to be divided into multiple alternating hot and cold air zones. The generator inner stator uses multiple support rings, and the support rings are separated into multiple hot and cold air zones by hoop rings and support rings. Each air zone is separated by air zone partitions. The generator inner stator and outer frame adopt a vertical elastic vibration isolation structure. The upper part of the spring plate is connected to the support ring on the stator core with bolts, and the lower part is connected to the frame support beam by welding. See details. Figure 1(a) Assemble the inner and outer stators; (b) Separate the upper and lower half of the frame, position the lower half of the frame, and fix the relevant support tools; (c) Place the inner stator on the assembly support tool and make the center lines between the inner and outer stators coincide by using the top outer frame; (d) After aligning the center lines of the inner and outer stators, weld the tangential spring plate 28, etc.; (e) Close the upper and lower half of the stator frame.

Claims

1. A multi-zone high-pressure hydrogen-cooled generator with a split upper and lower stator frame, comprising an upper stator frame (1), a lower stator frame (2), and end caps (3) for sealing both ends of the stator frame, characterized in that: The upper stator frame (1) and the lower stator frame (2) are respectively provided with an upper frame clamping plate (4) and a lower frame clamping plate (5) at the split point. The upper frame clamping plate (4) is provided with bolt holes for the clamping bolts (11) to pass through, and the lower frame clamping plate (5) is provided with blind holes that mate with the clamping bolts (11). The end of the lower frame clamping plate (5) that is in contact with the upper frame clamping plate (4) is provided with a sealing groove (6). 6) The interior is equipped with a rubber strip or filled with sealant. The sealing groove (6) is located between the blind hole and the interior of the machine base. The upper half stator machine base (1) and the lower half stator machine base (2) are provided with an airtight cover (7) for secondary sealing of the split part. An airtight test joint (8) is provided on the airtight cover (7). One end of the airtight cover (7) is welded to the airtight weld of the outer wall of the upper half machine base, and the other end is welded to the airtight weld of the outer wall of the lower half machine base or the lower half machine base assembly plate (5).

2. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 1, characterized in that: Both ends of the upper stator base (1) and the lower stator base (2) are provided with end plates (12) for fixing to the end cover (3). The end plates (12) are provided with circumferential sealing grooves (13) to ensure circumferential sealing between the base and the end cover (3), and rubber sealing strips are provided in the grooves.

3. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 2, characterized in that: The end cap (3) has an "S"-shaped sealing groove at the same plane position as the stator frame split, and a rubber sealing strip is provided in the "S"-shaped sealing groove. The circumferential sealing groove (13) has a sealing groove 1 (6) on one side of the stator frame split and an "S"-shaped protrusion of the "S"-shaped sealing groove on the other side, so that the rubber sealing strip or sealant in the three sealing grooves compresses each other, ensuring the sealing performance of the end cap (3) and the stator frame split.

4. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 3, characterized in that: The upper half of the base plate (4) and the lower half of the base plate (5) include two side portions parallel to the axis and two end portions perpendicular to the axis. The side portions parallel to the axis are provided with oblique positioning pins (10) to prevent deformation of the upper and lower half of the base. The oblique positioning pins (10) are symmetrically arranged on the other side portion parallel to the axis.

5. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 4, characterized in that: The end cover (3) is fixedly connected to the combined end plate of the stator frame formed by the combination of the upper half frame and the lower half frame by bolts. The radius of the circumference where the bolt is located is greater than the radius of the circumference where the sealing groove (13) is located.

6. A multi-zone high-pressure hydrogen-cooled generator with an upper and lower split-frame according to any one of claims 1-5, 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 (15) for cooperating with the stator and dividing the internal space of the assembled frame into multiple alternating cold air zones and hot air zones.

7. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 6, characterized in that: Both sides of the wind zone ring plate (15) at the split of the upper stator frame (1) and the lower stator frame (2) are provided with horizontally axially reinforcing clamping plates (16). The wind zone ring plates (15) at the beginning and end are respectively provided with inner end cover clamping ring plates (17) for clamping with the inner end cover. The inner end cover clamping ring plate (17) and the end plate (12) are provided with horizontally axially reinforcing clamping plates (16) at the split. The reinforcing clamping plates (16) of the upper stator frame (1) and the lower stator frame (2) are connected as one unit by clamping bolts (11) and vertical positioning pins (18) to improve the rigidity of the upper and lower frames, increase the resistance to deformation under high hydrogen pressure after the frames are clamped, and prevent the generator from leaking hydrogen.

8. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 7, 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 welded together with an airtight weld at the contact gap.

9. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 8, characterized in that: The sealing groove 1 (6) is a dovetail-shaped sealing groove.

10. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 9, characterized in that: The upper stator frame (1) and the lower stator frame (2) are welded with a hot air ventilation hood (19) and a cold air ventilation hood (20). Ventilation holes (21) corresponding to the cold air zone and the hot air zone are respectively provided on the outer walls of the upper stator frame (1) and the lower stator frame (2) in the corresponding areas of the hot air ventilation hood (19) and the cold air ventilation hood (20) to form a gas cooling air path.

11. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 1, characterized in that: The lower stator base (2) is welded to the outer wall with a wire outlet cover (22).

12. The multi-zone high-pressure hydrogen-cooled generator with upper and lower split-frame according to claim 1, characterized in that: The upper stator frame (1) is provided with a cooler package on its top for forming a cooling air path together with the hot air ventilation hood (19), the cold air ventilation hood (20) and the ventilation hole (21).

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