Hydro-generator rotor support and method of wind guiding thereof

Abstract

This invention discloses a rotor support for a hydro-generator and its air guiding method. An upper air guiding assembly is provided between the upper air inlet of the upper flange of the rotor support and the intermediate partition, providing an upper air guiding channel from the upper air inlet to the rotor magnetic yoke air duct. A lower air guiding assembly is provided between the lower air inlet of the lower flange of the rotor support and the intermediate partition, providing a lower air guiding channel from the lower air inlet to the rotor magnetic yoke air duct. The intermediate partition has through holes connecting the upper and lower air guiding channels. The upper and lower air guiding assemblies can be adjusted to change the cross-sectional width of the upper and lower air guiding channels respectively, and can be moved radially and then fixed. This invention overcomes the limitations of irregular airflow in existing technologies, optimizing ventilation logic from two dimensions: airflow path planning and pressure balance. Furthermore, the opening size and position of the upper and lower air inlets can be adjusted to prevent radial vortices caused by improper inlet position and size design.

Description

Technical Field

[0001] This invention relates to a rotor support for a hydro-generator and its air guiding method, belonging to the technical field of hydro-generators. Background Technology

[0002] The rotor of a hydro-generator is a key component for torque transmission in the rotating parts of the generator and also serves as the pressure source for the generator's ventilation and cooling system. It consists of a rotor support, a magnetic yoke duct, and magnetic poles connected in series. The rotor support is the first-stage pressure-boosting component and a crucial part for controlling airflow and ventilation losses in the generator's ventilation system. Its pressure head is generated by the rotation of the rotor spokes. In a static state, it must withstand thermal stress; during normal generator operation, the rotor support must withstand electromagnetic torque, the gravitational torque of the magnetic poles and yoke, the centrifugal force generated by its own rotation, and residual stress. Furthermore, the rotor support acts as a fan; the majority of the generator's air pressure head is generated by the rotor support, making it a key component for regulating airflow, air pressure, air velocity, and ventilation losses.

[0003] When the rotor rotates at high speed, the magnetic pole coils, damping windings, and iron core all generate heat due to electromagnetic and mechanical losses. Ventilation can create airflow to remove this heat in a timely manner, preventing excessive temperature from burning out the insulation and affecting the equipment's lifespan. Air enters the support frame through the upper and lower support inlets and flows towards the magnetic yoke duct under the drive of the support spokes. Due to the sudden reduction in the inlet area of ​​the magnetic yoke duct, the static pressure increases near the magnetic yoke in the support space. If there is no guiding structure within the support frame, air will form backflow and vortices within the support space. Simultaneously, if the inlet positions and sizes of the upper and lower supports are improperly designed, air will overflow from the support inlets, forming radial vortices on the outer side of the upper and rotor support wings, which rotate with the rotor. If the vortices are too large, they can block or obstruct the upper and lower air ducts, and even damage the structural components within the flow channels. Summary of the Invention

[0004] The purpose of this invention is to provide a turbine generator rotor support and its air guiding method to address the aforementioned problems.

[0005] The technical solution adopted in this invention is as follows: A rotor support for a hydro-generator includes parallel, annular upper and lower flanges, the outer periphery of which forms a rotor magnetic yoke air duct. Multiple vertically arranged spokes are positioned between the upper and lower flanges, dividing the annular region between them into multiple fan-shaped spaces circumferentially. Each fan-shaped space has an upper air inlet on the upper flange and a lower air inlet on the lower flange, with a central partition in the middle of each space. The upper air inlet and the central partition of the rotor support are further specified. An upper air guide assembly is provided between the partitions, which provides an upper air guide channel from the upper air inlet to the rotor magnetic yoke air duct; a lower air guide assembly is provided between the lower air inlet of the rotor support lower wing plate and the middle partition, which provides a lower air guide channel from the lower air inlet to the rotor magnetic yoke air duct; a through hole is provided on the middle partition, which connects the upper air guide channel and the lower air guide channel; the upper air guide assembly and the lower air guide assembly can adjust the cross-sectional width of the upper air guide channel and the lower air guide channel respectively, and can be moved radially and then fixed.

[0006] Alternatively, the upper air guide channel / lower air guide channel may be streamlined.

[0007] Alternatively, the upper air guide channel / lower air guide channel may be arc-shaped, with the center of the arc facing radially outward.

[0008] Optionally, both the upper air guide assembly and the lower air guide assembly include an inner air guide and an outer air guide, with an upper air guide channel / lower air guide channel between the inner air guide and the outer air guide.

[0009] Optionally, the cross-sectional area of ​​the upper air guide channel / lower air guide channel is the same as the area of ​​the upper air inlet / lower air inlet.

[0010] Alternatively, the inner and outer air guides may have soft sealing strips on both sides of their circumference for contact with the spokes.

[0011] Optionally, both the inner and outer air guides include a fixed plate and an air guide plate that are connected or integrated, and the fixed plate is a plane; the fixed plate of the inner air guide is located on the side of the air guide plate close to the axis, and the fixed plate of the outer air guide is located on the side of the air guide plate away from the axis.

[0012] Alternatively, the outer air guide may also include a baffle plate disposed between the fixed plate and the air guide plate.

[0013] Alternatively, the guide plate of the outer air guide component extends radially beyond the wind deflector by a certain distance, forming a cavity with the vertical plate and the upper / lower wing plate.

[0014] Alternatively, the fixing plate is provided with mounting holes for connecting to the upper or lower wing plate, the mounting holes being oblong-shaped holes that extend radially.

[0015] A method for guiding airflow through a rotor support of a hydro-generator includes the following steps: S1. Move the upper and lower air guide components radially to change the degree of obstruction of the upper and lower air inlets, adjust the size and position of the air inlet openings of the upper and lower air guide channels, and then fix the upper and lower air guide components. S2. When the rotor rotates, air enters the fan ring space through the upper and lower air inlets, flows along the upper and lower air guide channels, and flows to the rotor magnetic yoke air duct under the drive of the support spokes.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The present invention provides a turbine generator rotor support and its air guiding method. By using separate upper and lower air guiding components to separately guide the air intake paths of the upper and lower supports, and combining this with a design that connects the upper and lower channels through through holes to achieve pressure balance, the invention overcomes the limitations of irregular airflow in existing technologies. It optimizes ventilation logic from two dimensions: airflow path planning and pressure balance. Furthermore, by using adjustable upper and lower air guiding components to adjust the opening size and position of the upper and lower air inlets, radial vortices caused by improper inlet position and size design are prevented. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rotor support.

[0018] Figure 2 This is a schematic diagram of the internal structure of the rotor support.

[0019] Figure 3 This is a schematic diagram of the outer air guide component.

[0020] Figure 4 This is a schematic diagram of the inner air guide component.

[0021] The markings in the diagram are: 1-upper air inlet, 2-upper air guide assembly, 3-lower air inlet, 4-lower air guide assembly, 5-rotor magnetic yoke air duct, 6-spoke plate, 7-through hole, 8-inner air guide component, 9-outer air guide component, 10-soft sealing strip, 11-fixing plate, 12-air guide plate, 13-wind baffle, 14-cavity, 15-mounting hole, 16-upper wing plate, 17-lower wing plate, 18-fixing bolt, 19-middle partition plate. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] A rotor support for a hydro-generator, such as Figure 1-4 As shown, it includes an upper wing plate 16 and a lower wing plate 17 arranged in parallel and both being annular. The outer periphery of the upper wing plate 16 and the lower wing plate 17 is a rotor magnetic yoke air duct 5. Multiple vertically arranged spokes 6 are provided between the upper wing plate 16 and the lower wing plate 17. The spokes 6 divide the annular area between the upper wing plate 16 and the lower wing plate 17 into multiple fan-shaped annular spaces along the circumference. Each fan-shaped annular space has an upper air inlet 16 and a lower air inlet 3 on the lower wing plate 17. A middle partition 19 is also provided in the middle of each fan-shaped annular space. The upper air inlet 1 of the upper wing plate 16 and the middle partition 19 are also provided in the middle of each fan-shaped annular space. An upper air guide assembly 2 is provided between the partitions 19, which provides an upper air guide channel from the upper air inlet 1 to the rotor magnetic yoke air duct 5; a lower air guide assembly 4 is provided between the lower air inlet 3 of the lower wing plate 17 and the middle partition 19, which provides a lower air guide channel from the lower air inlet 3 to the rotor magnetic yoke air duct 5; a through hole 7 is provided on the middle partition 19, which connects the upper air guide channel and the lower air guide channel; the upper air guide assembly 2 and the lower air guide assembly 4 can adjust the cross-sectional width of the upper air guide channel and the lower air guide channel respectively, and can be moved radially and then fixed.

[0025] The upper wing plate 16 and the lower wing plate 17 are arranged in parallel and both adopt an annular structure. Their outer peripheries are connected to the rotor magnetic yoke duct 5, which can build a regular annular ventilation foundation space. This provides a stable flow carrier for the cooling airflow to be transported from the air inlet to the magnetic yoke duct, while ensuring smooth connection between the airflow and the magnetic yoke duct when it is transported outward. Multiple vertically arranged spokes 6 are installed between the upper wing plate 16 and the lower wing plate 17. The spokes 6 can divide the annular area between them into multiple independent fan-ring spaces along the circumference. This can avoid crosstalk between airflows in different circumferential areas, allowing the airflow in each fan-ring space to form a dedicated and orderly flow path, reducing disordered disturbances in the overall flow field. The upper wing plate 16 in each fan-ring space has an upper air inlet 1, and the lower wing plate 17 has a lower air inlet 3. This can achieve simultaneous air intake in both directions, expand the air intake area of ​​the overall ventilation system, increase the total supply of cooling airflow, and make the air intake distribution more uniform, avoiding the flow field imbalance problem caused by unilateral air intake. A partition 19 is installed in the middle of each fan-ring space, which divides a single fan-ring space into two relatively independent air-guiding areas, providing a structural basis for the arrangement of the upper and lower air-guiding components 4, preventing mutual interference between the upper and lower airflows, and providing a connection basis for the connection of the upper and lower air-guiding channels, balancing the flow pressure of the upper and lower airflows. The upper air-guiding component 2 is set between the upper air inlet 1 of the rotor support upper wing plate 16 and the partition 19, which can construct a dedicated airflow channel from the upper air inlet 1 to the rotor magnetic yoke duct 5, guiding the air entering the rotor support upper wing plate 16 to flow smoothly along a fixed path to the magnetic yoke duct, avoiding disordered airflow inside the rotor support upper wing plate 16. The lower air-guiding component 4 is set between the lower air inlet 3 of the rotor support lower wing plate 17 and the partition 19, which can form a directional airflow channel from the lower air inlet 3 to the rotor magnetic yoke duct 5, guiding the air entering the rotor support lower wing plate 17 to be stably delivered to the magnetic yoke duct, reducing the turbulent state of the airflow inside the rotor support lower wing plate 17. The through holes 7 on the intermediate partition 19 can connect the upper and lower air guide channels, balancing the airflow pressure inside the two channels and allowing the two airflow paths to form a coordinated flow state, avoiding flow abnormalities caused by pressure imbalance in a single channel. By adjusting the width of the air guide channels and moving the upper air guide assembly 2 and the lower air guide channel radially, the cross-sectional spacing and radial position of the air guide channels can be changed. This allows for flexible adjustment of the radial width and position of the air guide channels according to different operating conditions, enabling adjustments to the original opening of the rotor support. This avoids vortex generation and airflow imbalance caused by fixed channel dimensions that cannot match actual operating conditions, and increases the adaptability of the upper air guide assembly 2 and the lower air guide assembly 4.

[0026] This design allows airflow to enter the support structure through the upper inlet 1 and lower inlet 3, flowing orderly along the channels formed by the air guide components. This suppresses backflow and vortex generation within the support structure, while preventing air from overflowing outwards from the inlet, ensuring efficient delivery of all airflow to the magnetic yoke duct. This reduces energy loss caused by vortices and backflow within the duct, improving the overall operating efficiency of the generator. It also avoids duct blockage caused by excessive radial vortices on the upper and lower rotor support plates 16 and 17, protecting internal structural components from damage caused by abnormal airflow and maintaining long-term stable operation of the ventilation system. Furthermore, it matches the intake requirements of different specifications of magnetic yoke ducts, precisely controlling the airflow rate and velocity entering the duct. Finally, it fully utilizes the pressure head energy generated by the rotation of the rotor spokes 6, improving airflow delivery efficiency and ensuring the pressure head contributes more to effective ventilation rather than causing disorderly disturbances.

[0027] Existing ventilation designs for hydro-generator rotor supports mostly rely on the natural airflow guidance of the support structure itself. They lack independent airflow guiding structures for the upper air inlet 1 and lower air inlet 3, and fail to achieve balanced airflow between the upper and lower sections through the baffle through-holes 7. This makes them prone to airflow vortex backflow and air overflow at the support inlet. This solution uses separate upper and lower airflow guiding components to separately guide the airflow paths of the upper and lower supports. Combined with the design of connecting the upper and lower channels through the through-holes 7 to achieve pressure balance, the radial width and flow parameters of the airflow guiding channels can be flexibly adjusted according to different operating conditions to adapt to different ventilation requirements of air volume and pressure. This overcomes the technical limitations of existing technologies that suffer from irregular airflow.

[0028] In another specific implementation, the upper / lower air guide channel is streamlined. The streamlined inner air guide 8 and outer air guide 9 reduce the interaction area with air, keeping fluid molecules in a laminar flow state, reducing viscous and pressure resistance, thereby lowering airflow resistance and improving flow efficiency.

[0029] In another specific implementation, the upper / lower air guide channel is arc-shaped, with the center of the arc facing radially outward. This conforms to the natural flow trajectory of the airflow under the centrifugal force generated by the rotor's rotation, allowing the airflow to be smoothly transported outward along the arc-shaped path.

[0030] In another specific implementation, both the upper air guide assembly 2 and the lower air guide assembly 4 include an inner air guide 8 and an outer air guide 9, with an upper air guide channel / lower air guide channel between the inner air guide 8 and the outer air guide 9. The inner air guide plate 12 and the outer air guide plate 12 respectively divide the radial inner and outer spaces, forming a guide channel from the air inlet channel to the rotor magnetic yoke air duct 5 within the rotor support. This prevents air from flowing towards other non-preset locations, while ensuring a stable and balanced airflow entering the magnetic yoke air duct, avoiding insufficient ventilation or excessive airflow impact in local channels.

[0031] In another specific implementation, the cross-sectional area of ​​the upper / lower air guide channel is the same as the area of ​​the upper air inlet 1 / lower air inlet 3. This ensures a smooth transition of gas when entering the air guide channel, preventing complex pressure and velocity changes caused by sudden changes in the flow area, achieving stable and uniform airflow, effectively reducing energy loss, and improving the overall efficiency of the generator. Specifically, when the upper / lower air guide channel is smaller than the original rotor support opening size, the original opening is blocked by the inner air guide 8 and the outer air guide 9, thereby adjusting the opening size and position.

[0032] In another specific embodiment, the inner air guide 8 and the outer air guide 9 have soft sealing strips 10 on both sides of their circumference for contacting the spokes 6. The soft sealing strips 10 can deform and adhere tightly to the spokes 6, ensuring a tight seal between the inner air guide 8 and the outer air guide 9 and the spokes 6. This prevents air from flowing out from the gaps between the air guides and the spokes 6, causing losses or even turbulence, thus affecting the overall ventilation effect.

[0033] In another specific embodiment, both the inner air guide 8 and the outer air guide 9 include a fixed plate 11 and an air guide plate 12 that are connected or integrated. The fixed plate 11 is planar. The fixed plate 11 of the inner air guide 8 is located on the side of the air guide plate 12 closer to the axis, and the fixed plate 11 of the outer air guide 9 is located on the side of the air guide plate 12 away from the axis. The inner air guide 8 and the outer air guide 9 can be fixed to the upper wing plate 16 of the rotor support / lower wing plate 17 of the rotor support through the fixed plate 11, providing a fixed assembly position and evenly transmitting the force of the air guide assembly to the support body. Since the inner air guide 8 and the outer air guide 9 are respectively located on the radial inner and outer sides of the air inlet, and the fixing plate 11 is located on the side of the air guide plate 12 away from the air inlet, the air guide plate 12 can be close to the side of the air inlet, providing a wider range of installation positions, or ensuring that the cross-sectional area of ​​the upper air guide channel / lower air guide channel is consistent with the area of ​​the upper air inlet 1 / lower air inlet 3.

[0034] In another specific embodiment, the outer air guide 9 also includes a baffle plate 13 disposed between the fixed plate 11 and the air guide plate 12. This prevents airflow from flowing back between the fixed plate 11 and the air guide plate 12 and from forming vortices within the angle between the fixed plate 11 and the air guide plate 12. This reduces the additional ventilation losses caused by air backflow and vortices, allowing more of the pressure head generated by the rotor rotation to be converted into the power to drive the directional flow of cooling airflow.

[0035] In another specific implementation, the guide plate of the outer air guide 9 extends radially beyond the baffle plate 13 by a certain distance, forming a cavity 14 with the vertical plate and the upper wing plate 16 / lower wing plate 17. This directly prevents backflow of air after it is pressurized at the front end of the magnetic yoke duct, ensuring that the airflow always maintains a directional flow from the air guide channel to the magnetic yoke duct. This weakens the reverse thrust of the high-pressure area on the upstream airflow and prevents backflow from causing vortices and disturbances inside the support structure.

[0036] In another specific embodiment, the fixing plate 11 is provided with mounting holes 15 for connecting with the upper wing plate 16 or the lower wing plate 17. The mounting holes 15 are oblong holes that extend radially. Each air guiding structure can move radially along the oblong holes to change the cross-sectional spacing of the air guiding channels, specifically optimizing the initial state of airflow entering the air guiding channels, reducing airflow disturbance and ineffective flow, and effectively reducing energy loss during ventilation.

[0037] A method for guiding airflow through a rotor support of a hydro-generator includes the following steps: S1. Move the upper air guide assembly 2 and the lower air guide assembly 4 radially to change the degree of obstruction of the upper air inlet 1 and the lower air inlet 3, adjust the size and position of the air inlet openings of the upper air guide channel and the lower air guide channel, and fix the upper air guide assembly 2 and the lower air guide assembly 4 after adjustment. S2. When the rotor rotates, air enters the fan ring space through the upper air inlet 1 and the lower air inlet 3, flows along the upper air guide channel and the lower air guide channel, and flows to the rotor magnetic yoke air duct 5 under the drive of the support spokes 6.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. The invention extends to any new features or combinations disclosed in this specification, and any modifications, equivalent substitutions, and improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention. It is obvious to those skilled in the art that the invention is not limited to the details of the above exemplary embodiments, and that detailed technical features not disclosed in this embodiment, such as specific structures, are all prior art and can be obtained by those skilled in the art from the prior art. The connection method can be a fixed connection, a detachable connection, or an integral part; it can be a fixed connection, a movable connection, or a hinged connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific manner of the above terms in the embodiments of the present invention according to the specific circumstances, and this disclosure does not specifically limit this aspect.

Claims

1. A rotor support for a hydro-generator, characterized in that: The rotor support includes parallel, annular upper and lower wing plates, the outer periphery of which forms the rotor magnetic yoke air duct. Multiple vertically arranged spokes are positioned between the upper and lower wing plates, dividing the annular region between them into multiple fan-shaped ring spaces. Each fan-shaped ring space has an upper air inlet on the upper wing plate and a lower air inlet on the lower wing plate, with a central partition plate in the middle of each space. A space is provided between the upper air inlet of the upper wing plate and the central partition plate of the rotor support. An upper air guide assembly provides an upper air guide channel from the upper air inlet to the rotor magnetic yoke air duct; a lower air guide assembly is provided between the lower air inlet of the lower wing plate of the rotor support and the intermediate partition plate, providing a lower air guide channel from the lower air inlet to the rotor magnetic yoke air duct; a through hole is provided on the intermediate partition plate, the through hole connecting the upper air guide channel and the lower air guide channel; the upper air guide assembly and the lower air guide assembly can adjust the cross-sectional width of the upper air guide channel and the lower air guide channel respectively, and can be moved radially and then fixed.

2. The rotor support as described in claim 1, characterized in that: The upper and lower air guide channels are streamlined.

3. The rotor support as described in claim 1, characterized in that: The cross-sectional area of ​​the upper air guide channel / lower air guide channel is the same as the area of ​​the upper air inlet / lower air inlet.

4. The rotor support as described in claim 1, characterized in that: Both the upper air guide assembly and the lower air guide assembly include an inner air guide and an outer air guide, with an upper air guide channel and a lower air guide channel between the inner air guide and the outer air guide.

5. The rotor support as described in claim 4, characterized in that: The inner and outer air guides have soft sealing strips on both sides of their circumference for contact with the spokes.

6. The rotor support as described in claim 4, characterized in that: Both the inner and outer air guides include a fixed plate and an air guide plate that are connected or integrated, and the fixed plate is a plane; the fixed plate of the inner air guide is located on the side of the air guide plate close to the axis, and the fixed plate of the outer air guide is located on the side of the air guide plate away from the axis.

7. The rotor support as described in claim 6, characterized in that: The outer air guide also includes a baffle plate disposed between the fixed plate and the air guide plate.

8. The rotor support as described in claim 7, characterized in that: The guide plate of the outer air guide extends radially beyond the wind deflector by a certain distance, forming a concave cavity with the vertical plate and the upper / lower wing plate.

9. The rotor support as described in claim 6, characterized in that: The fixing plate is provided with mounting holes for connecting with the upper or lower wing plate. The mounting holes are oblong and extend radially.

10. A method for guiding airflow in a turbine generator rotor support, characterized in that: Includes the following steps: S1. Move the upper and lower air guide components radially to change the degree of obstruction of the upper and lower air inlets, adjust the size and position of the air inlet openings of the upper and lower air guide channels, and then fix the upper and lower air guide components. S2. When the rotor rotates, air enters the fan ring space through the upper and lower air inlets, flows along the upper and lower air guide channels, and flows to the rotor magnetic yoke air duct under the drive of the support spokes.

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