Single-radial-plate radial ventilation rotor support

Abstract

The invention discloses a single-radial-plate radial ventilation rotor support, and relates to the technical field of rotor supports. To solve the problem; the rotor support specifically comprises a center body, radial plates, rib plates, magnet yoke rings and magnetic poles, the center body is located in the center of the whole rotor support, one end of the center body is fixed to a rotating shaft in a key connection mode, and the other end of the center body is connected with an output component; the radial plates are radially arranged on the outer side of the center body and the inner sides of the rib plates and are annularly distributed along the center body; the rib plates are arranged between the radial plate and the magnet yoke ring, the number of the rib plates is multiple, and the multiple rib plates are arranged on the upstream side and the downstream side of the radial plate; the magnetic yoke ring is welded on the outer side of the rib plate; and the magnetic poles are fixed on the magnet yoke rings and are detachably connected. The invention has the advantages of low material cost, low processing cost, short installation period, saved construction period and convenient installation.

Description

Technical Field

[0001] This invention relates to the field of rotor support technology, and more particularly to a single-spoke radially ventilated rotor support. Background Technology

[0002] Currently, most large and medium-sized axial-flow hydro generators in China use a slanted arm structure for their rotor supports and a laminated yoke. For example... Figure 1 As shown, the rotor structure includes a rotor support, magnetic yoke, magnetic poles, and auxiliary components. The rotor support is connected to the shaft and magnetic yoke, and bears a combination of stresses including rated torque, gravitational torque, eccentric magnetic pull, and axial alternating force. In particular, the original unit's rotor support is a flexible structure with diagonal bracing and vertical ribs, resulting in complex stress distribution. This structure can convert radial force into tangential force, but its drawback is that the flexible structure exhibits large radial deformation and even greater tangential deformation.

[0003] Ventilation and heat dissipation are key steps in rotor design. The original unit used forced closed radial circulation ventilation, such as... Figure 2 As shown, the main airflow path is as follows: the cooled air from the air cooler is blown by the fan along the diameter direction through the spokes of the inclined support arm and the ventilation holes in the magnetic yoke laminations, towards the rotor magnetic poles and the inter-pole gaps, then through the air gap between the stator and rotor, and finally back to the air cooler through the ventilation holes of the V-shaped ribs on the back of the core. The ventilation holes of the magnetic yoke laminations are a crucial part of the main airflow path, and their airflow area affects the heat dissipation effect. However, this lamination method is commonly used in large units, but it leads to complex on-site lamination processes, long construction periods, and problems such as weld cracking after the flexible support structure is put into operation, affecting the safe operation of the unit.

[0004] Therefore, the present invention proposes a single-spoke radial ventilation rotor support. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a single-spoke radial ventilation rotor support.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A single-spoke radially ventilated rotor support includes a central body, spokes, stiffeners, a magnetic yoke ring, and magnetic poles, wherein:

[0008] The central body is located at the center of the entire rotor support. One end of the central body is fixed to the rotating shaft by a key connection, and the other end is connected to the output component.

[0009] The spokes are arranged radially on the outer side of the central body and the inner side of the stiffeners, and are distributed in a ring along the central body.

[0010] Ribs are provided between the spokes and the magnetic yoke ring, and multiple ribs are provided, with multiple ribs provided on the upstream and downstream sides of the spokes;

[0011] Magnetic yoke ring, the magnetic yoke ring is welded to the outside of the stiffening plate;

[0012] Magnetic poles are fixed to the yoke ring and form a detachable connection.

[0013] Preferably, the inner wall of the spoke plate is provided with multiple ventilation holes, which not only serve as air passages but also allow maintenance personnel to pass through.

[0014] Furthermore, the stiffeners have ventilation slots, and each stiffener has at least three rectangular, rounded holes.

[0015] Based on the aforementioned scheme: the magnetic yoke ring is made of a whole round steel plate rolled and welded. After its outer circle is machined, it is connected to the magnetic pole by high-strength bolts. Ventilation holes are also opened on the magnetic yoke ring. The ventilation holes of the magnetic yoke ring are aligned with the ventilation holes of the spokes and the ventilation grooves of the stiffeners to form a continuous radial air sealing path.

[0016] A better option among the aforementioned schemes is one that includes an upstream rotating wind baffle and a downstream rotating wind baffle, which are located upstream of the magnetic yoke ring and downstream of the rotor support, respectively, to block axial ventilation.

[0017] As a further aspect of the present invention, it also includes an upper ring plate and a lower ring plate, which are welded to the upstream and downstream of the spokes, respectively, to enhance the rigidity of the rotor support. The upper ring plate also serves as a brake plate.

[0018] At the same time, the height of the iron core of the magnetic pole is increased, which raises the magnetic pole coil to reserve ventilation space.

[0019] As a preferred embodiment of the present invention, the single-spoke radial ventilation rotor support is a rigid structure with a spoke and stiffener thickness greater than 25 mm and an average stress value of less than 10 MPa under rated working conditions calculated by finite element method.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The first advantage of this invention is its low material cost: the magnetic yoke ring only requires a single thick steel plate to be rolled. In contrast, magnetic yoke laminations require custom-made, more expensive magnetic yoke steel plates.

[0022] 2. The second advantage of this invention is low processing cost: the magnetic yoke ring only needs to be welded and then the outer circle is machined.

[0023] 3. The third advantage of this invention is its short installation cycle and reduced construction time: The magnetic yoke ring of this invention does not require assembly on-site, while the magnetic yoke stack of the original structure requires an installation foundation and installation tools on-site, and then the magnetic yoke stamping pieces are stacked one by one according to a specific process, which takes a long time.

[0024] 4. The fourth advantage of this invention is its ease of installation. The magnetic poles can be installed simply by bolting them onto the yoke. In contrast, the original structure required magnetic pole shims, adjusting shims, and finally, wedges to tighten the magnetic poles, which was time-consuming and labor-intensive. Attached Figure Description

[0025] Figure 1 A schematic diagram of the rotor for the inclined arm rotor support;

[0026] Figure 2 This is a schematic diagram of the unit's composition structure in the existing technology;

[0027] Figure 3 This is a schematic diagram of the overall structure of a single-spoke radial ventilation rotor support proposed in this invention;

[0028] Figure 4 This is a schematic diagram of the spoke structure of a single-spoke radial ventilation rotor support proposed in this invention;

[0029] Figure 5 This is a schematic diagram of the magnetic poles of a single-spoke radial ventilation rotor support proposed in this invention;

[0030] Figure 6 This is a schematic diagram of the stiffener structure of a single-spoke radial ventilation rotor support proposed in this invention.

[0031] In the diagram: 1. Central body; 2. Spoke plate; 3. Rib plate; 4. Downstream rotating windbreak plate; 5. Lower ring plate; 6. Magnetic yoke ring; 7. Magnetic pole; 8. Upstream rotating windbreak plate; 9. Upper ring plate. Detailed Implementation

[0032] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Example 1:

[0035] A single-spoke radially ventilated rotor support, such as Figure 3 , 4As shown in Figures 5 and 6, the structure includes a central body 1, spokes 2, stiffening plates 3, a downstream rotating windbreak 4, a lower ring plate 5, a magnetic yoke ring 6, a magnetic pole 7, an upstream rotating windbreak 8, and an upper ring plate 9, wherein:

[0036] The central body 1 is located at the core of the rotor support. As the central component of the entire structure, it is fixed to the shaft via a key connection and undertakes the main torque transmission function. It connects radially inward to the shaft and outward to other components; specifically:

[0037] The central body 1 is fixed to the unit shaft by mechanical connection (such as key connection) to form the power transmission base. The central body 1 is directly connected to the spokes 2. The spokes are usually fixed to the outside of the central body by welding or bolts to ensure the integrity of the structure.

[0038] The spoke 2 is a single-span structure, radially arranged on the outer side of the central body 1, forming a ring around the central body. The spoke has multiple ventilation holes, which not only serve as air passageways but also allow maintenance personnel to pass through, facilitating maintenance. The spoke 2 is located between the central body 1 and the stiffening plate 3, playing a crucial role in connecting the two; specifically:

[0039] The spokes 2 are connected to the center body 1 by welding or high-strength bolts to form a rigid support. The spokes 2 are also connected to the stiffening plates 3 and the lower ring plate 5: the stiffening plates 3 are welded to the upper and lower sides of the spokes, and the lower ring plate 5 is welded to the lower end of the spokes to enhance rigidity. The ventilation holes of the spokes 2 are aligned with the ventilation holes of the magnetic yoke ring 6 to ensure a continuous airflow path.

[0040] Multiple stiffening plates 3 are welded to the upstream and downstream sides of the spoke plate 2, radially arranged on the outer side. Each stiffening plate 3 has ventilation slots and at least three rectangular, rounded holes to optimize airflow. The stiffening plates 3 are located between the spoke plate 2 and the magnetic yoke ring 6, serving as a transitional support; specifically:

[0041] The stiffening plate 3 is fixed to the spoke plate 2 by welding to form a firm connection. The stiffening plate 3 and the magnetic yoke ring 6 are connected by welding, and the magnetic yoke ring 6 is fixed to the outside of the stiffening plate. The opening of the stiffening plate 3 works in conjunction with the ventilation hole of the spoke plate 2 to ensure smooth radial ventilation.

[0042] The downstream rotating baffle 4 is located on the downstream side of the rotor support, specifically at the outer edge of the spokes 2 or the lower ring plate 5. It is used to block axial ventilation. The downstream rotating baffle 4 is spatially adjacent to the magnetic yoke ring 6 and the magnetic pole 7, but maintains a certain distance to avoid interference; specifically:

[0043] The downstream rotating wind deflector 4 is fixed to the downstream end of the lower ring plate 5 or the spoke plate 2 by welding to form an integral wind deflector structure. It is not directly connected to the magnetic yoke ring 6 and the magnetic pole 7, but the air volume is concentrated and flows radially through the position matching.

[0044] The lower ring plate 5 is welded to the downstream side of the spoke plate 2, located inside the downstream rotating wind deflector 4 or on the same plane. The lower ring plate 5, as a ring structure, enhances the rigidity of the rotor support and is symmetrically arranged with the upper ring plate 9; specifically:

[0045] The lower ring plate 5 is connected to the spoke plate 2 by welding to form a rigid support; the lower ring plate 5 is also connected to the downstream rotating wind deflector plate 4 by welding or bolts to jointly block the axial wind path; the lower ring plate 5 is not directly connected to the central body 1, but is indirectly connected through the spoke plate 2.

[0046] The magnetic yoke ring 6 is a yoke ring made of a single round steel plate, located outside the stiffening plate 3 and adjacent to the magnetic pole 7 mounting area. The magnetic yoke ring 6 is positioned radially between the stiffening plate 3 and the magnetic pole 7, and its surface is drilled with ventilation holes. Multiple holes are arranged between every two magnetic poles, specifically:

[0047] The magnetic yoke ring 6 is fixed to the outside of the stiffening plate 3 by welding to form an integral structure; the magnetic yoke ring 6 and the magnetic pole 7 are connected by high-strength bolts to ensure that the magnetic pole is firmly installed. The ventilation holes of the magnetic yoke ring 6 are aligned with the holes of the spoke plate 2 and the stiffening plate 3 to form a continuous radial air path.

[0048] Magnetic pole 7 is mounted on the outer circumferential surface of the yoke coil 6. A raised design (increased core height) allows for ventilation space in the magnetic pole coil. Magnetic pole 7 is located on the outermost side of the rotor support, forming an air gap with the stator for ventilation and heat dissipation.

[0049] Specifically, the magnetic pole 7 is directly attached to the magnetic yoke ring 6 by high-strength bolts to form a detachable connection. The magnetic pole 7 is not directly connected to the downstream rotating wind baffle 4 and the lower ring plate 5, but is indirectly connected through the fixing of the magnetic yoke ring 6. The raised design of the magnetic pole and the opening of the stiffener 3 ensure that the air path bypasses the magnetic pole and avoids blockage.

[0050] The upstream rotating baffle 8 is located on the upstream side of the rotor support, specifically at the upstream end of the magnetic yoke ring 6. Its position is symmetrical to the downstream rotating baffle 4, but on the opposite side. It aims to block axial ventilation between the magnetic poles and in the stator-rotor air gap, ensuring concentrated radial airflow. The upstream rotating baffle 8 is axially adjacent to the magnetic yoke ring 6, maintaining a certain gap to avoid interference. However, it also partially overlaps radially with the mounting area of ​​the magnetic pole 7 to effectively seal the axial airflow path. The upstream rotating baffle 8 is also spatially closely connected to the upper ring plate 9, located on the outer edge of the upper ring plate 9 or on the same plane, forming a windbreak barrier. Specifically:

[0051] The upstream rotating wind deflector 8 is fixed to the upper ring plate 9 by welding or directly connected to the spoke plate 2.

[0052] The upper ring plate 9 is located on the upstream side of the rotor support, symmetrically arranged with the lower ring plate 5 to form a complete ring structure. The upper ring plate 9 is welded to the upstream end of the spoke plate 2, and is located at the upstreammost position of the support in the axial direction, adjacent to or partially overlapping with the upstream rotating wind deflector plate 8. The upper ring plate 9 serves as a brake plate, and its position facilitates docking with the unit's braking system while enhancing overall rigidity. The upper ring plate 9 covers the outer edge of the spoke plate 2 in the radial direction and is indirectly connected to the upstream end of the stiffener plate 3 to ensure uniform stress distribution.

[0053] When the rotor support is working, the ventilation system adopts forced closed radial circulation. Cold air enters from the air cooler through the fan, passes through the ventilation holes of the spoke plate 2 and the ventilation holes on the magnetic yoke ring 6, and is blown radially toward the magnetic pole 7 and the inter-pole gap. Then it enters the stator core ventilation groove through the air gap between the stator and rotor, and finally returns to the air cooler for circulation. The downstream rotating baffle plate 4 and the upstream rotating baffle plate 8 block the axial air path to ensure concentrated radial airflow and avoid leakage. The magnetic pole coil is raised and the stiffener plate 3 is opened to avoid the air outlet being blocked. The air path bypasses the magnetic pole 7 and the stiffener plate 3 to keep it smooth. In terms of stress, the rigid structure distributes the load through thick steel plates and has a large weld area to reduce stress concentration.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A single-spoke radially ventilated rotor support, characterized in that, It includes a central body (1), spokes (2), stiffeners (3), a magnetic yoke ring (6), and magnetic poles (7), wherein: The central body (1) is located at the center of the entire rotor support. One end of the central body (1) is fixed to the rotating shaft by a key connection, and the other end is connected to the output component. The spokes (2) are arranged radially on the outer side of the central body (1) and the inner side of the stiffeners (3), and are distributed in a ring along the central body (1); Rib plate (3) is provided between the spoke plate (2) and the magnetic yoke ring (6), and multiple rib plates (3) are provided, with multiple rib plates (3) provided on the upstream and downstream sides of the spoke plate (2); Magnetic yoke ring (6) is welded to the outside of stiffener plate (3); Magnetic pole (7) is fixed on the magnetic yoke ring (6) and forms a detachable connection.

2. The single-spoke radial ventilation rotor support according to claim 1, characterized in that, The inner wall of the spoke (2) is provided with multiple ventilation holes, which are used not only for air passage but also allow maintenance personnel to pass through.

3. The single-spoke radial ventilation rotor support according to claim 1, characterized in that, The stiffener (3) has ventilation slots, and each stiffener (3) has at least three rectangular and rounded holes.

4. A single-spoke radial ventilation rotor support according to claim 1, characterized in that, The magnetic yoke ring (6) is made of rolled and welded whole round steel plate. After its outer circle is machined, it is connected to the magnetic pole (7) by high-strength bolts. The magnetic yoke ring (6) also has ventilation holes. The ventilation holes of the magnetic yoke ring (6) are aligned with the ventilation holes of the spoke plate (2) and the ventilation groove of the stiffening plate (3) to form a continuous radial air sealing path.

5. A single-spoke radial ventilation rotor support according to claim 1, characterized in that, It includes an upstream rotating wind baffle (8) and a downstream rotating wind baffle (4), which are located upstream of the magnetic yoke ring (6) and downstream of the rotor support, respectively, to block axial ventilation.

6. A single-spoke radially ventilated rotor support according to claim 1, characterized in that, It also includes an upper ring plate (9) and a lower ring plate (5), which are welded to the upstream and downstream of the spokes (2) respectively to enhance the rigidity of the rotor support. The upper ring plate (5) also serves as a brake plate.

7. A single-spoke radial ventilation rotor support according to claim 1, characterized in that, The core height of the magnetic pole (7) is increased to raise the magnetic pole coil in order to reserve ventilation space.

8. A single-spoke radial ventilation rotor support according to claim 1, characterized in that, The single-spoke radial ventilation rotor support is a rigid structure. The thickness of the spokes (2) and stiffeners (3) is greater than 25 mm. The average stress under rated working conditions is less than 10 MPa according to finite element calculation.

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