Axial partition ventilation hydro-generator suitable for high speed and large capacity

Abstract

The present application belongs to the technical field of generator, and particularly relates to an axial partition ventilation water turbine generator suitable for high speed and large capacity. The stator frame of the water turbine generator comprises two non-hole ring plates connected to the stator core, the end of the outer ring of the stator core is provided with a plurality of air coolers, the adjacent air coolers are sealed by sealing plates, the two non-hole ring plates enclose an intermediate partition with an open outer side, the non-hole ring plates and the air coolers enclose end partitions, the outer side of the end partitions is connected with an outer edge sealing plate, the outlet side of the air coolers is connected with an air outlet ring, and the air outlet ring is provided with a plurality of air pipes. In order to solve the above problems existing in the prior art, the purpose of the present application is to provide an axial 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 an axially partitioned ventilation turbine generator suitable for high speed and large capacity. Background Technology

[0002] Large motors generate a lot of losses during operation, including copper losses in the stator and rotor coils, iron core losses, and wind friction losses generated during airflow. These losses not only lead to an increase in the temperature of various components of the motor, but also to a decrease in the efficiency of the motor's mechanical energy to electrical energy conversion.

[0003] In particular, with the continuous development of ultra-high speed and large capacity of motors, the axial length of motors has increased significantly, and the losses that need to be removed have increased significantly. It has become more important for motor cooling systems to remove a large amount of heat while ensuring a small axial temperature difference and reducing ventilation losses to improve motor efficiency.

[0004] Currently, ventilation grooves are arranged on the stator core in the ventilation structure design of large hydro-generators. Air is driven to flow radially from the inside to the outside by the rotor pressure. As for the rotor, depending on the motor speed, capacity and structural characteristics, the rotor side forms a conventional mixed-flow hydro-generator with pure radial ventilation or a axial-radial mixed ventilation method with magnetic yoke fans arranged at the upper and lower ends of the magnetic yoke.

[0005] Furthermore, while maintaining the overall ventilation structure essentially unchanged, designers have invented various enhanced cooling structures to improve the cooling effect of the magnetic pole windings. These primarily involve designing special airflow paths or increasing the coil's heat dissipation area to improve cooling efficiency. For example, patent "201620476391.9 - Internal Cooling Airflow Guide Device for Salient Pole Motor Magnetic Pole Coil" discloses a novel heat dissipation structure. This patent separates the airflow paths of the cooling gas entering the internal cooling airflow path of the magnetic pole coil from those between the magnetic poles by setting airflow guide vanes in the magnetic yoke ventilation duct, thus enhancing the cooling effect on the magnetic pole coil. Although this structure improves the heat dissipation effect of the magnetic pole coil, it is relatively complex, especially since it does not optimize the airflow arrangement according to the axial heat dissipation characteristics of the magnetic pole coil, and therefore cannot effectively reduce the axial temperature difference and ventilation losses of the motor.

[0006] For stator ventilation channels, hydro generators generally adopt a radial ventilation method from the inside out, resulting in low air utilization. In contrast, due to their high speed and compact structure, horizontally arranged steam turbine generators employ various ventilation methods. For example, several patents, such as "Nanjing 350MW Air-Cooled Steam Turbine Generator," recommend a ventilation structure with multiple axial inlet and outlet air zones spaced apart to reduce the axial temperature difference of the motor. However, the axial length of steam turbine generators is much longer than that of hydro generators, and the cooler arrangement is also quite different. This makes it impossible to directly use them on high-speed, large-capacity hydro generators. Furthermore, none of the patents recommend a configuration principle for the length of the inlet and outlet air zones, and the practical applicability requires further research.

[0007] In existing generator ventilation structures, air utilization is low and ventilation losses are high. Summary of the Invention

[0008] In order to solve the above-mentioned problems in the prior art, the purpose of this invention is to provide an axially partitioned ventilation turbine generator with high air utilization and low ventilation loss, suitable for high speed and large capacity.

[0009] The technical solution adopted in this invention is as follows: A high-speed, high-capacity axially partitioned ventilated hydro-generator is characterized by: a rotating shaft, a rotor support connected to the rotating 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, and a stator frame connected to the stator core; the stator frame includes two non-perforated annular plates connected to the stator core, several air coolers are provided at the ends of the outer ring of the stator core, adjacent air coolers are sealed by sealing plates, the two non-perforated annular plates form a middle partition with an outer opening, the non-perforated annular plates and the air coolers form an end partition, an outer edge sealing plate is connected to the outer side of the end partition, an air outlet ring is connected to the outlet side of the air cooler, and several air ducts are provided on the air outlet ring.

[0010] 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. After passing through the centrifugal blades, some of the external air enters the gap between adjacent magnetic poles 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 and reaches the outside of the stator frame via the air duct. The airflow then passes through the intermediate section, further cooling the central area of ​​the stator core. After passing through the central area of ​​the stator core, the air mixes with the air flowing out between the annular air gap and the rotor core, then enters the corresponding stator core area in the end sections, finally entering the air cooler from the end sections. The cooled air is then discharged through the outlet ring.

[0011] Because the stator frame is divided into a middle section and an end section along the axial direction, in the stator core area corresponding to the middle section, air flows from the outer edge to the inner edge of the stator core; in the stator core area corresponding to the end section, 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 because the air flows along a defined path, it can uniformly cool all areas of the stator core, correspondingly reducing ventilation losses.

[0012] As a preferred embodiment of the present invention, it further includes a wind deflector connected to an air outlet ring. The opening of the air outlet ring extends beyond the wind deflector. The rotor yoke, rotor core, stator core, and stator frame are all shielded by the wind deflector, and an air intake channel is provided between the wind deflector and the rotor yoke. The wind deflector prevents excessive air leakage and guides airflow through the duct on the air outlet ring, further improving air utilization.

[0013] In a preferred embodiment of the present invention, the end section is provided with a plurality of perforated annular plates connected to the stator core, and the perforated annular plates are provided with circumferential air holes. Airflow flows uniformly in the stator core region corresponding to the end section before entering the region between the perforated annular plates. The airflow in the region between the perforated annular plates passes through the circumferential air holes and converges into the air cooler. The uniform airflow in the stator core region corresponding to the end section ensures uniform cooling.

[0014] 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.

[0015] In a preferred embodiment of the present invention, pressure plates are provided at both ends of the stator, 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.

[0016] 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.

[0017] 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.

[0018] In a preferred embodiment of the present invention, an axial ring plate is provided between two adjacent magnetic poles of the rotor core. The axial ring plate has several ventilation holes, and an end baffle connects the axial ring plate to the magnetic pole of the rotor core. By adding an axial ring plate at the outer edge between the magnetic poles, the salient-pole hydro-generator is de-polarized, reducing surface friction losses caused by rotor rotation. Airflow passes through the gap between adjacent magnetic poles and enters the annular air gap through the ventilation holes, ensuring that all areas of the rotor core are adequately and uniformly cooled, further improving air utilization and reducing ventilation losses.

[0019] In a preferred embodiment of the present invention, the axial ring plate does not have ventilation holes in the area corresponding to the middle partition, and the distance between the ventilation holes gradually decreases from the end to the middle. The axial ring plate has no air ducts in the middle partition area of ​​the stator frame, avoiding interference and collision between the rotor exhaust and stator exhaust. The distance between the ventilation holes gradually decreases from the end to the middle, achieving a uniform axial temperature distribution in the magnetic pole coils.

[0020] As a preferred embodiment of the present invention, the ventilation holes are arranged at the middle position of the axial ring plate or at both sides of the axial ring plate.

[0021] The beneficial effects of this invention are as follows: 1. The stator frame of the present invention is divided into a middle section and an end section in the axial direction. In the stator core area corresponding to the middle section, air flows from the outer edge to the inner edge of the stator core; in the stator core area corresponding to the end section, air flows from the inner edge to the outer edge of the stator core and then enters the cooler. The air passes through the stator core area twice, which improves the air utilization rate; and the air flows along a defined path, which can uniformly cool all areas of the stator core, thereby reducing ventilation losses.

[0022] 2. By adding an axial ring plate at the outer edge between the poles of the magnetic pole core, the salient pole hydro generator is made non-saliently polarized, reducing surface friction losses caused by rotor rotation. Airflow passes through the gap between adjacent magnetic pole cores and enters the annular air gap through ventilation holes, ensuring that all areas of the rotor core are adequately and uniformly cooled, further improving air utilization and reducing ventilation losses. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a top view of the rotor section structure; Figure 3 This is a schematic diagram of the first type of axial ring plate; Figure 4 This is a schematic diagram of the second type of axial ring plate.

[0024] 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-Perforated ring plate; 62-Outer sealing plate; 63-Outlet ring; 64-Air duct; 65-Perforated ring plate; 411-Ventilation hole; 651-Circumferential air hole. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] like Figure 1 As 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.

[0028] like Figure 1 and Figure 2As shown, this embodiment is applicable to a high-speed, large-capacity axially partitioned ventilation turbine generator, characterized by: 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, and a stator frame 6 connected to the stator core 5; the stator frame 6 includes components connected to... The stator core 5 has two non-perforated ring plates 61. Several air coolers 7 are provided at the ends of the outer ring of the stator core 5. Adjacent air coolers 7 are sealed by sealing plates. The two non-perforated ring plates 61 form a middle section with an outer opening. The non-perforated ring plates 61 and the air coolers 7 form an end section. An outer edge sealing plate 62 is connected to the outside of the end section. An air outlet ring 63 is connected to the outlet side of the air cooler 7. Several air ducts 64 are provided on the air outlet ring 63. The stator core 5 has a stator coil 54.

[0029] During rotor rotation, air passing through rotor support 2 passes through rotor yoke 3 and rotor core 4 and enters annular air gap 9, thereby cooling the middle part of rotor yoke 3 and rotor core 4. After passing through centrifugal blades 31, part of the external air enters the gap between adjacent magnetic pole cores of rotor core 4, fully cooling rotor coil (43) and rotor core 4, and then enters annular air gap 9. Another part of the air passing through centrifugal blades 31 passes through stator coil 54 and passes through air duct 64 to reach the outside of stator frame 6. The airflow passes through the intermediate partition and then cools the middle area of ​​stator core 5. After passing through the middle area of ​​stator core 5, the air mixes with the air flowing out between annular air gap 9 and rotor core 4, and then enters the corresponding stator core 5 area in the end partition, and finally enters air cooler 7 from the end partition. The cooled air is sent out through air outlet ring 63.

[0030] Since the stator frame 6 is divided into a middle section and an end section in the axial direction, in the stator core 5 region corresponding to the middle section, air flows from the outer edge to the inner edge of the stator core 5; in the stator core 5 region corresponding to the end section, air flows from the inner edge to the outer edge of the stator core 5 before entering the cooler. The air passes through the stator core 5 region twice, improving air utilization; and the air flows along a defined path, uniformly cooling all areas of the stator core 5, thus reducing ventilation losses.

[0031] Furthermore, the end section is provided with several perforated annular plates 65 connected to the stator core 5, and the perforated annular plates 65 are provided with circumferential air holes 651. The airflow flows uniformly in the stator core 5 area corresponding to the end section, and then enters the area between each perforated annular plate 65. The airflow in the area between each perforated annular plate 65 passes through the circumferential air holes 651 and then converges into the air cooler 7. The airflow flows uniformly in the stator core 5 area corresponding to the end section, ensuring uniform cooling.

[0032] To reduce air leakage, the present invention also includes a wind deflector 8, which is connected to an air outlet ring 63. The opening of the air outlet ring 63 extends out of the wind deflector 8. The rotor yoke 3, rotor core 4, stator core 5, and stator frame 6 are all shielded by the wind deflector 8, and an air intake channel is provided between the wind deflector 8 and the rotor yoke 3. The wind deflector 8 can prevent large amounts of air leakage and guide airflow through the air duct 64 on the air outlet ring 63, further improving air utilization.

[0033] 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.

[0034] The stator 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.

[0035] 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 of the rotor yoke 3 is symmetrically arranged along the horizontal central axis of the generator, and the central air duct 32 is either the space between two yoke rings or several circumferential gaps between yoke laminations.

[0036] To achieve salient polarization of the magnetic pole core, an axial ring plate 41 is provided between two adjacent magnetic pole cores of the rotor core 4. The axial ring plate 41 has several ventilation holes 411, and an end baffle 42 connects the axial ring plate 41 to the magnetic pole core of the rotor core 4. Figure 3 and Figure 4 As shown, the ventilation holes 411 are arranged at the center of the axial ring plate 41 or at both sides of the axial ring plate 41. By adding axial ring plates 41 at the outer edge between the magnetic pole cores, the salient pole hydro turbine generator is decoupled, reducing surface friction losses caused by rotor rotation. Airflow passes through the gap between adjacent magnetic pole cores and enters the annular air gap 9 through the ventilation holes 411, ensuring that all areas of the rotor core 4 are adequately and uniformly cooled, further improving air utilization and reducing ventilation losses.

[0037] In this design, the axial ring plate 41, corresponding to the middle partition area, does not have ventilation holes 411, and the distance between the ventilation holes 411 gradually decreases from the end to the middle. The axial ring plate 41, corresponding to the middle partition area on the stator frame 6, has no air duct, avoiding interference and collision between the rotor exhaust and stator exhaust. The distance between the ventilation holes 411 gradually decreases from the end to the middle, achieving a uniform axial temperature distribution in the magnetic pole coils.

[0038] The present invention provides centrifugal blades 31 on the rotating component to generate pressure. By setting the middle section and the end section of the stator base 6, a special cooling air path is formed for the stator axial air distribution zone. The middle position is the air inlet zone and the two ends are the air outlet zones. The height of the air inlet zone is 1 / 7 to 1 / 5 of the total height of the stator.

[0039] By adding an axial ring plate 41 at the outer edge between the poles of the magnetic pole core, the salient pole hydro generator is made non-saliently polarized. The axial ring plate 41 extends axially and has radial ventilation holes 411. The distance between the ventilation holes 411 gradually decreases from the end to the middle, thus achieving a uniform axial temperature distribution of the magnetic pole coil. The axial ring plate 41 has no air duct in the middle partition area corresponding to the stator frame 6, which avoids interference and collision between the rotor air outlet and the stator air outlet.

[0040] The air-water coolers are arranged in a ring at the upper and lower ends of the stator frame 6.

[0041] The ventilation structure of the present invention has the advantages of small axial temperature difference between the motor stator and rotor coils (43) and low ventilation loss, which can reduce ventilation loss by more than 1 / 4 compared with the same period last year.

[0042] 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. An axially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications, characterized in that: The system 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), and a stator frame (6) connected to the stator core (5); characterized in that: the stator frame (6) includes components connected to the stator... Two non-perforated ring plates (61) are on the iron core (5). Several air coolers (7) are provided at the end of the outer ring of the stator iron core (5). Adjacent air coolers (7) are sealed by a sealing plate. The two non-perforated ring plates (61) form a middle section with an outer opening. The non-perforated ring plates (61) and the air coolers (7) form an end section. An outer edge sealing plate (62) is connected to the outside of the end section. An air outlet ring (63) is connected to the outlet side of the air cooler (7). Several air ducts (64) are provided on the air outlet ring (63). 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. 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. An axial ring plate (41) is provided between two adjacent magnetic pole cores of the rotor core (4). A plurality of ventilation holes (411) are provided on the axial ring plate (41). An end baffle (42) is connected between the axial ring plate (41) and the magnetic pole core of the rotor core (4). The axial ring plate (41) does not have ventilation holes (411) in the area corresponding to the middle partition, and the distance between the ventilation holes (411) gradually decreases from the end to the middle. In the stator core (5) region corresponding to the middle partition, air flows from the outer edge of the stator core (5) to the inner edge; in the stator core (5) region corresponding to the end partition, air flows from the inner edge of the stator core (5) to the outer edge and then enters the cooler.

2. The axially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 1, characterized in that: It also includes a windshield (8), which is connected to an air outlet ring (63). The opening of the air outlet ring (63) extends out of the windshield (8). The rotor yoke (3), rotor core (4), stator core (5) and stator frame (6) are all covered by the windshield (8). An air intake channel is left between the windshield (8) and the rotor yoke (3).

3. The axially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 1, characterized in that: The end section is provided with a number of perforated ring plates (65) connected to the stator core (5), and the perforated ring plates (65) are provided with circumferential air holes (651).

4. A type of axially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 1, characterized in that: Pressure plates (52) are provided at both ends of the stator, and the two pressure plates (52) are connected by a tensioning screw (53).

5. A type of axially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 1, characterized in that: The central air duct (32) is the space between two magnetic yoke rings or several circumferential gaps between magnetic yoke stacks.

6. A type of axially partitioned ventilation turbine generator suitable for high-speed, large-capacity applications according to claim 1, characterized in that: The ventilation holes (411) are arranged at the middle of the circumference of the axial ring plate (41) or at both sides of the circumference of the axial ring plate (41).

Images