A high-speed large-capacity circumferential partition ventilation hydro-generator

Abstract

The present application belongs to the technical field of generator, and particularly relates to a circumferential partition ventilation water turbine generator suitable for high speed and large capacity. The stator frame of the generator comprises a plurality of ring plates connected to the stator core, a plurality of axially distributed vertical plates connected to the stator core, the ring plates and the vertical plates are cross arranged, the plurality of vertical plates divide the stator frame into 2N circumferential partitions from the circumferential direction, the odd-numbered circumferential partitions of the stator frame are connected with air coolers, the even-numbered circumferential partitions of the stator frame are connected with outer edge sealing plates, and the plurality of ring plates arranged in the area of the even-numbered circumferential partitions of the stator frame are provided with ventilation holes. The present application provides a circumferential partition ventilation water turbine generator suitable for high speed and large capacity, which has high air utilization rate and low ventilation loss.

Description

Technical Field

[0001] This invention belongs to the field of generator technology, and specifically relates to a circumferentially partitioned ventilation turbine generator suitable for high speed and large capacity. Background Technology

[0002] As a mechanical energy to motor conversion device, the motor generates a huge amount of heat during operation, including copper loss of stator and rotor coils, iron core loss, and wind friction loss generated during air flow. It is crucial to design an efficient and reliable cooling system to conduct this heat to the outside of the motor and ensure the safe operation of the motor.

[0003] In particular, with the continuous advancement of technology, the combination of factors such as higher speed and larger capacity of motors has led to a significant increase in the axial length of motors. This has resulted in a substantial increase in the losses that need to be carried away. As a result, it has become increasingly important for motor cooling systems to ensure that a large amount of heat is removed while maintaining a small axial temperature difference and reducing ventilation losses, thereby improving motor efficiency.

[0004] Because hydro-generators have relatively high rotational speeds and large diameters, utilizing the pressure generated by the rotor's rotation to drive air circulation within the generator is a common approach. To maintain a simple generator structure and high maintainability, the main ventilation methods are of two types:

[0005] For a typical mixed-flow hydro generator, radial air ducts are arranged on both the rotor yoke and the stator core. Air flows from the inside out through the rotor air duct, air gap, and stator air groove, cooling the rotor coils and stator coils in sequence, thus carrying away the heat of the generator. Figure 5 This is the radial ventilation structure.

[0006] For large generator-motors operating at high speeds, the radial pressure and radial flow area generated by the rotor yoke alone are insufficient to meet cooling requirements. Radial blades must be added to the upper and lower ends of the yoke to form axial airflow channels for the rotor, thus addressing the bottleneck of insufficient airflow. Figure 6 This is a radial hybrid ventilation structure.

[0007] Furthermore, given the basic selection of the overall ventilation structure, in order to improve the cooling effect of the magnetic pole winding, the designers invented an enhanced cooling structure, mainly by increasing the heat dissipation area of ​​the coil to improve the cooling effect. For example, patent "201621467353.3 A Combined Internal and External Cooling Structure for Rotor Magnetic Pole Winding" discloses a novel heat dissipation structure, including a magnetic pole coil, which is composed of multiple layers of stacked current-carrying buses. Its characteristic is that longitudinal flow channels are provided on the current-carrying buses along the axial coil side of the magnetic pole coil, and the current-carrying buses with longitudinal flow channels are arranged adjacently or at intervals. This structure improves the heat dissipation effect of the magnetic pole coil, but requires the machining of a large number of air holes on the magnetic pole coil, making the structure relatively complex and the manufacturing cost high. In particular, it cannot effectively reduce motor ventilation losses while improving the cooling effect of the magnetic pole coil.

[0008] In summary, the existing ventilation structure of generators has low air utilization and high ventilation losses. Summary of the Invention

[0009] In order to solve the above-mentioned problems in the prior art, the purpose of this invention is to provide a high-speed, large-capacity circumferentially ventilated water turbine generator with high air utilization and low ventilation loss.

[0010] The technical solution adopted in this invention is as follows:

[0011] A high-speed, high-capacity circumferentially partitioned ventilated hydro-generator includes a shaft, a rotor support connected to the shaft, a rotor yoke connected to the rotor support, centrifugal blades at both ends of the rotor yoke, a rotor core connected to the rotor yoke, a stator core surrounding the rotor core, an annular air gap between the rotor core and the stator core, a stator frame connected to the stator core, and the stator frame including several layers of annular plates connected to the stator core; the stator frame also includes several axially distributed vertical plates connected to the stator core, the annular plates and vertical plates being intersected, the vertical plates dividing the stator frame circumferentially into 2N circumferential partitions, air coolers connected to the odd-numbered circumferential partitions of the stator frame, outer edge sealing plates connected to the even-numbered circumferential partitions of the stator frame, and ventilation holes provided in the areas of the even-numbered circumferential partitions of the stator frame on the annular plates.

[0012] During rotor rotation, air passing through the rotor support, the rotor yoke, and the rotor core enters the annular air gap, thus cooling the rotor yoke and the middle part of the rotor core. External air, after passing through the centrifugal blades, partially enters the gap between adjacent magnetic pole cores of the rotor core, thoroughly cooling the rotor coils and rotor core, before entering the annular air gap. Another portion of the air, after passing through the centrifugal blades, passes through the stator coils, reaches the stator frame, and enters the stator frame through ventilation holes on the annular plate. After passing through the corresponding stator core area in the circumferential partition, the air mixes with the air flowing out between the rotor cores, then enters the stator core area corresponding to the adjacent circumferential partition, and finally enters the air cooler for further cooling.

[0013] Because ventilation holes are only provided on the ring plate in the areas corresponding to the even-numbered circumferential sections of the stator frame, air flows from the outer edge to the inner edge of the stator core in the stator core areas corresponding to the even-numbered circumferential sections of the stator frame; and from the inner edge to the outer edge in the stator core areas corresponding to the odd-numbered circumferential sections of the stator frame, before entering the cooler. The air passes through the stator core areas twice, improving air utilization; and because the air flows along a defined path, it can evenly cool all areas of the stator core, correspondingly reducing ventilation losses.

[0014] As a preferred embodiment of the present invention, it further includes a wind shield connected to the stator frame. The rotor yoke, rotor core, stator core, and stator frame are all shielded by the wind shield, and an air intake channel is provided between the wind shield and the rotor yoke. The wind shield can prevent large-scale air leakage and guide airflow into the ventilation holes on the ring plate, further improving air utilization.

[0015] In a preferred embodiment of the present invention, the air cooler, vertical plate, and ring plate within the same circumferential zone are sealed together, as are the outer edge sealing plate, vertical plate, and ring plate within the same circumferential zone. The sealing connection of the outer edge sealing plate, vertical plate, and ring plate ensures that all air entering through the ventilation holes flows through the corresponding area of ​​the stator core. The sealing connection of the air cooler, vertical plate, and ring plate ensures that all air exiting the stator core is cooled by the air cooler, reducing the temperature of the air entering the generator from the outside.

[0016] In a preferred embodiment of the present invention, adjacent stator core sections are supported by stator channel steel, and the space between the stator channel steel forms a stator ventilation groove. Air passes through the stator ventilation groove and then through the stator core, thereby sufficiently cooling the stator core.

[0017] In a preferred embodiment of the present invention, pressure plates are provided at both ends of the stator core, and the two pressure plates are connected by tension screws. After the pressure plates at both ends are connected by tension screws, all stator core sections form a whole.

[0018] In a preferred embodiment of the present invention, the rotor support is provided with support vents, and the rotor yoke is provided with a central air duct. A portion of the external air enters the central air duct of the rotor yoke through the support vents, thereby ensuring that the rotor yoke is adequately cooled.

[0019] As a preferred embodiment of the present invention, the central air duct is the space between two magnetic yoke rings or several circumferential gaps between magnetic yoke stacks.

[0020] In a preferred embodiment of the present invention, axial ring plates are provided at the upper and lower sections between adjacent magnetic poles of the rotor core. The gap between the two axial ring plates forms a radial airflow channel, and end baffles are connected between the axial ring plates and the magnetic poles of the rotor core. Connecting axial ring plates between adjacent magnetic poles and sealing the end gaps of the magnetic poles with end baffles enables the salient poles to be depolarized, reducing surface friction losses caused by rotor rotation. The radial airflow channel between the two axial ring plates can reduce the temperature and axial temperature difference at the middle position of the rotor coil. Airflow passes through the gap between adjacent magnetic poles and enters the annular air gap from the radial airflow channel, ensuring that all areas of the rotor core are adequately and uniformly cooled, further improving air utilization and reducing ventilation losses.

[0021] As a preferred embodiment of the present invention, the two axial ring plates are symmetrically arranged on the rotor core.

[0022] As a preferred embodiment of the present invention, a stator coil is provided on the stator core.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. In this invention, ventilation holes are provided only in the areas corresponding to the even-numbered circumferential partitions of the stator frame on the ring plate. Thus, in the stator core area corresponding to the even-numbered circumferential partitions of the stator frame, air flows from the outer edge to the inner edge of the stator core; in the stator core area corresponding to the odd-numbered circumferential partitions of the stator frame, air flows from the inner edge to the outer edge of the stator core before entering the cooler. The air passes through the stator core area twice, improving air utilization; and the air flows along a defined path, uniformly cooling all areas of the stator core, thereby reducing ventilation losses.

[0025] 2. Axial ring plates and end baffles are installed on the outer edges of adjacent magnetic pole cores to achieve salient polarization of the salient pole cores, reducing surface friction losses caused by rotor rotation. The radial airflow channel between the two axial ring plates reduces the temperature and axial temperature difference at the center of the rotor coil. Airflow passes through the gap between adjacent magnetic pole cores and enters the annular air gap from the radial airflow channel, ensuring sufficient and uniform cooling of all areas of the rotor core, further improving air utilization and reducing ventilation losses. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the air flow position from the outside to the inside in the stator ventilation groove in this invention;

[0027] Figure 2 This is a cross-sectional view of the air flow position from the inside to the outside in the stator ventilation groove in this invention;

[0028] Figure 3 This is a top view of part of the stator structure;

[0029] Figure 4 This is a top view of the rotor section structure;

[0030] Figure 5 This is a schematic diagram of an existing radially ventilated hydro-generator.

[0031] Figure 6 This is a schematic diagram of the structure of an existing axial-radial mixed ventilation hydro-generator.

[0032] In the diagram: 1-Rotor shaft; 2-Rotor support; 3-Rotor yoke; 4-Rotor core; 5-Stator core; 6-Stator frame; 7-Air cooler; 8-Wind shield; 9-Annular air gap; 21-Support vent; 31-Centrifugal blade; 32-Central air duct; 41-Axial ring plate; 42-End baffle; 43-Rotor coil; 51-Stator channel steel; 52-Pressure plate; 53-Tightening screw; 54-Stator coil; 61-Ring plate; 62-Vertical plate; 63-Outer sealing plate; 611-Ventilation hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0035] like Figure 1 and Figure 2As shown, the basic structure of the hydro-generator is as follows: The hydro-generator consists of rotating components such as the shaft 1, rotor support 2, rotor yoke 3, rotor core 4, and rotor coil 43, while stationary components include the stator core 5, stator coil 54, stator frame 6, and cooler. The rotor yoke 3 is composed of stacked steel plates of a certain thickness, assembled into a single unit through tensioning and welding. Stator channel steel 51 supports adjacent stator core sections, forming stator ventilation grooves. Finally, the stator is integrated through end plates 52 and tensioning screws 53. An annular air gap 9 is provided between the rotating and stationary components. During generator operation, complex electromagnetic interactions are generated between the rotating and stationary components through this annular air gap 9, ensuring the generator's power output.

[0036] like Figures 1-4 As shown, the high-speed, large-capacity circumferentially partitioned ventilation turbine generator of this embodiment includes a rotating shaft 1, a rotor support 2 connected to the rotating shaft 1, a rotor yoke 3 connected to the rotor support 2, centrifugal blades 31 provided at both ends of the rotor yoke 3, a rotor core 4 connected to the rotor yoke 3, a stator core 5 sleeved on the rotor core 4, an annular air gap 9 formed between the rotor core 4 and the stator core 5, a stator frame 6 connected to the stator core 5, and the stator frame 6 including several layers of annular plates 61 connected to the stator core 5; The stator frame 6 also includes several axially distributed vertical plates 62 connected to the stator core 5. The ring plates 61 are arranged intersecting with the vertical plates 62. The several vertical plates 62 divide the stator frame 6 into 2N circumferential sections. An air cooler 7 is connected to the odd-numbered circumferential sections of the stator frame 6, and an outer edge sealing plate 63 is connected to the even-numbered circumferential sections of the stator frame 6. Ventilation holes 611 are provided in the areas of the even-numbered circumferential sections of the stator frame 6, and stator coils 54 are provided on the stator core 5.

[0037] It should be noted that the air cooler 7, vertical plate 62, and ring plate 61 within the same circumferential zone are sealed together, as are the outer edge sealing plate 63, vertical plate 62, and ring plate 61 within the same circumferential zone. This sealing connection ensures that all air entering through the ventilation hole 611 flows through the corresponding area of ​​the stator core 5. The sealed connection of the air cooler 7, vertical plate 62, and ring plate 61 ensures that all air exiting the stator core 5 is cooled by the air cooler 7, reducing the temperature of the air entering the generator from outside.

[0038] During rotor rotation, air passing through rotor support 2, rotor yoke 3, and rotor core 4 enters annular air gap 9, thereby cooling the middle of rotor yoke 3 and rotor core 4. External air, after passing through centrifugal blades 31, partially enters the gap between adjacent magnetic pole cores of rotor core 4, fully cooling rotor coil 43 and rotor core 4, before entering annular air gap 9. Another portion of the air, after passing through centrifugal blades 31, passes through stator coil 54, reaches stator frame 6, and enters stator frame 6 through ventilation holes 611 on ring plate 61. After passing through the corresponding stator core 5 area of ​​the circumferential partition, the air mixes with the air flowing out between rotor cores 4, then enters the stator core 5 area corresponding to the adjacent circumferential partition, and finally enters air cooler 7 for cooling.

[0039] Because ventilation holes 611 are provided only in the even-numbered circumferential sections of the stator frame 6 on the ring plate 61, air flows from the outer edge to the inner edge of the stator core 5 in the even-numbered circumferential sections of the stator frame 6; and from the inner edge to the outer edge before entering the cooler in the stator core 5 areas corresponding to the odd-numbered circumferential sections of the stator frame 6. The air passes through the stator core 5 areas twice, improving air utilization; and because the air flows along a defined path, it can uniformly cool all areas of the stator core 5, thereby reducing ventilation losses.

[0040] To reduce air leakage, the present invention also includes a wind shield 8, which is connected to the stator frame 6. The rotor yoke 3, rotor core 4, stator core 5, and stator frame 6 are all shielded by the wind shield 8, and an air intake channel is provided between the wind shield 8 and the rotor yoke 3. The wind shield 8 can prevent large amounts of air leakage and guide airflow into the ventilation holes 611 on the ring plate 61, further improving air utilization.

[0041] The stator core 5 is supported by stator channel steel 51 between adjacent stator core sections, and the space between the stator channel steel 51 forms a stator ventilation groove. Air passes through the stator ventilation groove and then through the stator core 5, thereby fully cooling the stator core 5.

[0042] The stator core 5 is provided with pressure plates 52 at both ends, and the two pressure plates 52 are connected by tension screws 53. After the pressure plates 52 at both ends are connected by tension screws 53, all stator core sections form a whole.

[0043] To ensure sufficient cooling of the rotor yoke 3, the rotor support 2 is provided with support vents 21, and a central air duct 32 is provided in the middle of the rotor yoke 3. A portion of the external air enters the central air duct 32 of the rotor yoke 3 through the support vents 21, thus ensuring sufficient cooling of the rotor yoke 3. The central air duct 32 is the space between two yoke rings or several circumferential gaps between yoke laminations.

[0044] To achieve salient polarization of the magnetic pole core, axial ring plates 41 are provided on the upper and lower sections between adjacent magnetic pole cores of the rotor core 4. The axial ring plates 41 are located on the side of the rotor core 4 closest to the stator core 5, and are symmetrically arranged on the rotor core 4. The gap between the two axial ring plates 41 forms a radial airflow channel. End baffles 42 connect the axial ring plates 41 to the magnetic pole cores of the rotor core 4. Connecting the axial ring plates 41 between adjacent magnetic pole cores and sealing the end gaps of the magnetic pole cores with end baffles 42 enables salient polarization of the magnetic pole cores, reducing surface friction losses caused by rotor rotation. A radial airflow channel with a height of 1 / 6 to 1 / 4 of the axial ring plates 41 is left between them, which can reduce the temperature and axial temperature difference at the middle position of the rotor coil 43. The airflow passes through the gap between adjacent magnetic pole cores and enters the annular air gap 9 from the radial airflow channel, ensuring that all areas of the rotor core 4 are sufficiently and uniformly cooled, further improving air utilization and reducing ventilation losses.

[0045] This invention uses centrifugal blades 31 on the rotating component to generate pressure. Through a special combination of the outer sealing plate 63 and the stator base 6, a special cooling air path is formed in the circumferential air distribution zone of the stator. The number of zones is equal to twice the number of air coolers 7. The area of ​​the air cooler 7 corresponds to the stator air outlet zone (airflow from the inside to the outside), and the area between the coolers is the stator air inlet zone (airflow from the outside to the inside).

[0046] By adding an axial ring plate 41 and an end baffle 42 at the outer edge of the magnetic pole core, the salient pole hydro generator is de-polarized, reducing ventilation losses. The baffle is axially arranged with only 1 / 6 to 1 / 4 of its height having a radial airflow channel, which is used to reduce the temperature at the middle position of the rotor coil 43 and the axial temperature difference.

[0047] The ventilation structure of the present invention can reduce ventilation losses by more than one-third while ensuring good cooling effect of the generator.

[0048] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A high-speed, large-capacity circumferentially partitioned ventilation turbine generator, comprising a shaft (1), a rotor support (2) connected to the shaft (1), a rotor yoke (3) connected to the rotor support (2), centrifugal blades (31) provided at both ends of the rotor yoke (3), a rotor core (4) connected to the rotor yoke (3), a stator core (5) sleeved on the rotor core (4), an annular air gap (9) formed between the rotor core (4) and the stator core (5), a stator frame (6) connected to the stator core (5), and the stator frame (6) comprising several layers of annular plates (61) connected to the stator core (5); characterized in that: The stator frame (6) also includes several axially distributed vertical plates (62) connected to the stator core (5). The ring plates (61) and the vertical plates (62) are arranged intersectingly. The several vertical plates (62) divide the stator frame (6) into 2N circumferential partitions. An air cooler (7) is connected to the odd-numbered circumferential partitions of the stator frame (6), and an outer edge sealing plate (63) is connected to the even-numbered circumferential partitions of the stator frame (6). The several ring plates (61) are provided with ventilation holes (611) in the areas of the even-numbered circumferential partitions of the stator frame (6). The air cooler (7), vertical plate (62) and ring plate (61) in the same circumferential zone are sealed together, and the outer edge sealing plate (63), vertical plate (62) and ring plate (61) in the same circumferential zone are sealed together.

2. The circumferentially partitioned ventilation turbine generator according to claim 1, characterized in that: It also includes a windshield (8), which is connected to the stator frame (6). The rotor yoke (3), rotor core (4), stator core (5) and stator frame (6) are all shielded by the windshield (8), and an air intake channel is left between the windshield (8) and the rotor yoke (3).

3. A circumferentially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 1, characterized in that: The adjacent stator core sections of the stator core (5) are supported by stator channel steel (51), and the space of the stator channel steel (51) forms a stator ventilation groove.

4. A circumferentially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 1, characterized in that: The stator core (5) is provided with pressure plates (52) at both ends, and the two pressure plates (52) are connected by tension screws (53).

5. A circumferentially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 1, characterized in that: The rotor support (2) is provided with a support air hole (21), and the rotor yoke (3) is provided with a central air duct (32) in the middle.

6. A circumferentially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 5, characterized in that: The central air duct (32) is the space between two magnetic yoke rings or several circumferential gaps between magnetic yoke stacks.

7. A circumferentially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 1, characterized in that: The upper and lower sections of the two adjacent magnetic pole cores of the rotor core (4) are provided with axial ring plates (41), and the gap between the two axial ring plates (41) forms a radial airflow channel. An end baffle (42) is connected between the axial ring plate (41) and the magnetic pole core of the rotor core (4).

8. A circumferentially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 7, characterized in that: The two axial ring plates (41) are symmetrically arranged on the rotor core (4).

9. A circumferentially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to any one of claims 1 to 8, characterized in that: The stator core (5) is provided with stator coils (54).

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