Lightweight integrated frame having low temperature rise of large-capacity synchronous generator
By designing an integrated base and optimizing the cooling and ventilation path, the problems of large synchronous generators being heavy and hot have been solved, achieving the effects of lightweighting and low temperature rise.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CSIC ELECTRICAL MACHINERY SCI & TECH
- Filing Date
- 2025-11-20
- Publication Date
- 2026-06-18
Smart Images
Figure CN2025136236_18062026_PF_FP_ABST
Abstract
Description
Low temperature rise and lightweight integral frame of large-capacity synchronous generator Technical Field
[0001] This invention relates to the field of generator technology, and in particular to a low-temperature rise, lightweight integral frame for a large-capacity synchronous generator. Background Technology
[0002] A generator is a mechanical device that converts mechanical energy into electrical energy. It is driven by a water turbine, steam turbine, diesel engine or other power machinery. It converts the energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and then transmits it to the generator, which in turn converts it into electrical energy. Generators have a wide range of uses in industrial and agricultural production, national defense, science and technology and daily life. There are many types of generators, but their working principle is based on the laws of electromagnetic induction and electromagnetic force.
[0003] The generator frame plays a crucial role in supporting the stationary stator and bearing electromagnetic torque. The larger the power capacity of the generator, the larger its stator, and consequently, the larger and heavier the generator frame. Currently, many large synchronous generators use a three-section frame. Each of the three sections needs to meet specific rigidity and strength requirements, resulting in not only significant weight but also numerous component rotations, bolted connections, numerous mating surfaces, increased machining requirements, and inconvenient installation of the air guide at the end of the drive winding. Summary of the Invention
[0004] This invention provides a low-temperature rise, lightweight integrated frame for a large-capacity synchronous generator, which solves the problems of multiple turnover processes between components, large processing volume, heavy weight, inconvenient installation of some components, and rapid temperature rise inside the generator in the prior art.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A low-temperature rise, lightweight integrated frame for a large-capacity synchronous generator includes a main shaft, a rotor, and two rotor spacers. The rotor has a stator core inside and outside, and several circumferentially distributed ventilation holes are opened on one side of the outer wall of the stator core. A cylinder is provided outside the stator core, and a frame partition is provided at both ends of the cylinder. Several mounting holes are opened on one side of the outer wall of the two frame partitions, and hollow steel is embedded in the mounting holes. A stator pressure ring is provided on one side of the stator core, and a wind guide is provided on one side of the stator pressure ring. A stator spacer is provided on one side of the stator core. End cover chambers are provided on both sides of the two frame partitions.
[0007] Preferably, the rotor is embedded in the outer wall of the main shaft, and two rotor spacers are respectively sleeved on the outer walls of both ends of the main shaft, and the two rotor spacers are respectively fixed to the outer wall of the main shaft by snap rings.
[0008] Preferably, the cylinder is sleeved on the outer wall of the stator core, and the two base partitions are respectively fixed on the outer walls of the two ends of the cylinder.
[0009] Preferably, each of the two base partition rings has several insertion holes on its outer wall, and each of the two ends of the stator core has several fixing holes on its outer wall. The stator core is fixed to the inner wall of the two base partition rings by several pins.
[0010] Preferably, the stator pressure ring has several stops on its outer wall, and the stator pressure ring is fixed to the inner wall of the machine base partition ring by a positioning pin, and the air guide is fixed to one side of the outer wall of the stator pressure ring.
[0011] Preferably, the stator spacer ring is fixed to the inner wall of the base partition ring by a positioning pin, and the outer wall of the stator spacer ring has several air inlets distributed in a circle.
[0012] Preferably, the two end cover chambers are respectively bolted to the outer wall of one side of the two base partitions, and the outer walls of the two end cover chambers are provided with heat dissipation vents that are evenly distributed.
[0013] The beneficial effects of this invention are as follows:
[0014] The function of the integrated frame partition is divided, with a portion of the main functions of rigidity and strength allocated to the core pressure ring. Therefore, the back ventilation function of the core section remains in the stator core. The space between the two frame partitions is sealed only by a closed cylinder. The stator core pressure ring and partition are fixed and torque is transmitted using a stop and heavy-duty pins. Simultaneously, a pre-installed stop for the drive-end air guide is provided on the stator pressure ring, allowing for pre-installation of the air guide on the stator core, making operation extremely convenient. Furthermore, the motor air intake path at the non-drive end of the stator core is optimized by increasing the axial clearance at the end of the non-drive end of the stator core, reducing... The air resistance guides a portion of the cooling air flowing towards the rotor's axial ventilation holes, which is then bent and directed towards the back of the stator. This allows the cooling air to flow through the ends of the stator windings, carrying away the heat generated by the windings and resulting in a lower generator temperature rise. Finally, hollow steel is used instead of solid steel in the non-load-bearing parts of the frame, with the cylinder only meeting processing requirements. The overall strength and rigidity of the generator are achieved by the frame and the iron core, thereby reducing the weight of the generator frame. This effectively reduces generator production costs, decreases the number of turnovers during production, reduces safety hazards in production, and lightens the generator weight, while also offering the advantage of low temperature rise. Attached Figure Description
[0015] Figure 1 is a schematic diagram of the overall main view cross-sectional structure of the low-temperature rise and lightweight integral frame of the large-capacity synchronous generator proposed in this invention.
[0016] Figure 2 is a schematic diagram of the main cross-sectional structure of the low-temperature rise and lightweight integral frame of the large-capacity synchronous generator proposed in this invention.
[0017] Figure 3 is a schematic diagram of the enlarged structure at point A in Figure 2 proposed in this invention.
[0018] Figure 4 is a schematic diagram of the main structure of the stator core of the low-temperature rise and lightweight integral frame of the large-capacity synchronous generator proposed in this invention.
[0019] Figure 5 is a schematic diagram of the main structure of the base partition of the low-temperature rise and lightweight integral base of the large-capacity synchronous generator proposed in this invention.
[0020] Figure 6 is a schematic diagram of the stator spacer structure of the low-temperature rise and lightweight integral frame of the large-capacity synchronous generator proposed in this invention.
[0021] In the diagram: 1. Main shaft; 2. Rotor; 3. Rotor spacer ring; 4. Stator core; 5. Cylinder; 6. Base partition plate; 61. Hollow steel; 7. Stator pressure ring; 8. Air guide body; 9. Stator spacer ring; 10. End cover chamber. Detailed Implementation
[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0023] Example 1, referring to Figures 1-3, describes a low-temperature rise, lightweight integrated base for a large-capacity synchronous generator. It includes a main shaft 1, a rotor 2 embedded in the outer wall of the main shaft 1, and two rotor spacers 3 respectively fitted onto the outer walls of both ends of the main shaft 1. The two rotor spacers 3 are fixed to the outer wall of the main shaft 1 by snap rings. A stator core 4 is provided inside and outside the rotor 2, and several circumferentially distributed ventilation holes are opened on one side of the outer wall of the stator core 4. A cylinder 5 is provided outside the stator core 4, fitted onto the outer wall of the stator core 4. A base partition 6 is provided at both ends of the cylinder 5, and the two base partitions 6 are respectively fixed to the outer walls of both ends of the cylinder 5. Several mounting holes are opened on one side of the outer wall of each of the two base partitions 6, and hollow steel 61 is embedded in each of these mounting holes. Several insertion holes are opened on the outer wall of the circular rings of the two base partitions 6. Several fixing holes are opened on the outer walls of both ends. The stator core 4 is fixed to the inner wall of the two base partition plates 6 by several pins. A stator pressure ring 7 is provided on one side of the stator core 4. Several stops are opened on the outer wall of the stator pressure ring 7. The stator pressure ring 7 is fixed to the inner wall of the base partition plate 6 by positioning pins. An air guide 8 is provided on one side of the stator pressure ring 7. The air guide 8 is fixed on the outer wall of one side of the stator pressure ring 7. A stator spacer 9 is provided on one side of the stator core 4. The stator spacer 9 is fixed to the inner wall of the base partition plate 6 by positioning pins. Several air inlets are opened on the outer wall of the stator spacer 9 in a circular arrangement. End cover chambers 10 are provided on both sides of the two base partition plates 6. The two end cover chambers 10 are respectively connected to the outer wall of one side of the two base partition plates 6 by bolts. Heat dissipation vents are evenly distributed on the outer wall of the two end cover chambers 10.
[0024] The function of the integrated frame partition is divided, with a portion of the main functions of rigidity and strength allocated to the core pressure ring. Therefore, the back ventilation function of the core section is still retained in the stator core 4. The space between the two frame partitions is only sealed with a closed cylinder. The stator pressure ring 7 is fixed to the partition and the torque is transmitted using a stop and positioning pin. At the same time, a mounting stop for the drive end air guide 8 is reserved on the stator pressure ring 7, allowing the air guide to be installed on the stator core 4 in advance. Secondly, the non-drive end of the stator core 4 optimizes the motor feed. The airflow path is improved by increasing the axial clearance at the non-drive end of the stator core 4 to reduce air resistance. This guides a portion of the cooling air flowing towards the rotor's axial ventilation holes to bend and flow towards the back of the stator, thereby achieving the purpose of cooling air flowing through the ends of the stator windings and carrying away the heat generated by the windings, resulting in a lower generator temperature rise. Finally, hollow steel 61 is used instead of solid steel in the non-load-bearing parts of the frame, and the cylinder only needs to meet the processing requirements. The overall strength and rigidity of the generator are achieved by the frame and the core together, thereby achieving the purpose of reducing the weight of the generator frame.
[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0027] 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 low-temperature rise, lightweight integral frame for a large-capacity synchronous generator, comprising a main shaft (1), a rotor (2), and two rotor spacers (3), characterized in that, The rotor (2) is provided with a stator core (4) inside and outside, and a number of ventilation holes distributed in a circle are opened on one side of the outer wall of the stator core (4). The stator core (4) is provided with a cylinder (5) outside, and a base partition (6) is provided at both ends of the cylinder (5). A number of mounting holes are opened on one side of the outer wall of the two base partitions (6), and hollow steel (61) is embedded in the mounting holes. A stator pressure ring (7) is provided on one side of the stator core (4), and a guide body (8) is provided on one side of the stator pressure ring (7). A stator spacer ring (9) is provided on one side of the stator core (4), and an end cover chamber (10) is provided on both sides of the two base partitions (6).
2. The low-temperature rise, lightweight integral frame of the large-capacity synchronous generator according to claim 1, characterized in that, The rotor (2) is embedded on the outer wall of the main shaft (1), and two rotor spacers (3) are respectively sleeved on the outer walls of both ends of the main shaft (1). The two rotor spacers (3) are respectively fixed to the outer wall of the main shaft (1) by snap rings.
3. The low-temperature rise, lightweight integral frame of the large-capacity synchronous generator according to claim 1, characterized in that, The cylinder (5) is sleeved on the outer wall of the stator core (4), and the two base partitions (6) are respectively fixed on the outer walls of the two ends of the cylinder (5).
4. The low-temperature rise, lightweight integral frame of the large-capacity synchronous generator according to claim 1, characterized in that, The outer walls of the two base partition plates (6) are provided with several insertion holes, and the outer walls of both ends of the stator core (4) are provided with several fixing holes. The stator core (4) is fixed to the inner walls of the two base partition plates (6) by several pins.
5. The low-temperature rise, lightweight integral frame of the large-capacity synchronous generator according to claim 1, characterized in that, The stator pressure ring (7) has several stops on its outer wall, and the stator pressure ring (7) is fixed to the inner wall of the machine base partition (6) ring by a positioning pin. The air guide (8) is fixed on the outer wall of one side of the stator pressure ring (7).
6. The low-temperature rise, lightweight integral frame of the large-capacity synchronous generator according to claim 1, characterized in that, The stator spacer ring (9) is fixed to the inner wall of the base partition plate (6) by a positioning pin, and a number of air inlets are distributed in a circular pattern on the outer wall of the stator spacer ring (9).
7. The low-temperature rise, lightweight integral frame of the large-capacity synchronous generator according to claim 1, characterized in that, The two end cover chambers (10) are respectively bolted to the outer wall of one side of the two base partitions (6), and the outer walls of the two end cover chambers (10) are provided with heat dissipation vents distributed at equal intervals.