Generator rotating shaft supporting structure and generator rotor supporting system
By adopting a combination structure of rolling bearings and elastic support rings on the exciter generator shaft, the high cost problem caused by sliding bearings is solved, and synchronous floating and thermal expansion adaptation of the exciter generator shaft and the main generator shaft are realized, thereby reducing costs and improving stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2026-04-03
AI Technical Summary
The use of sliding bearings to support the excitation generator shaft increases the overall cost of the steam turbine generator set.
It adopts a combined structure of rolling bearing, elastic support ring and bearing housing. The elastic support ring is set on the outside of the rolling bearing to achieve a function similar to that of a sliding bearing, thereby reducing costs.
This technology enables synchronous floating of the excitation generator shaft and the main generator shaft, reducing the cost of the generator shaft support structure and adapting to the axial movement caused by the thermal expansion of the main generator rotor, thereby improving operational stability.
Smart Images
Figure CN224083296U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of generator technology, and in particular to a generator shaft support structure and a generator rotor support system. Background Technology
[0002] The brushless excitation system of a steam turbine generator consists of a generator and an excitation generator coaxially connected to the generator. The main generator shaft is supported by two sliding bearings. The contact surfaces of the sliding bearings and the main generator shaft are separated by a layer of oil film. The main generator shaft floats on the oil film, and the oil film has a hydrodynamic effect, causing the main generator shaft to rise and fall with the oil film pressure during normal operation. To ensure the stability of the steam turbine generator shaft system, the excitation generator shaft needs to rise and fall together with the main generator shaft. Therefore, sliding bearings are currently used to support the excitation generator, ensuring that the excitation generator shaft can rise and fall with the main generator shaft, thus maintaining the balance of the generator shaft system. However, the purchase and operating costs of the sliding bearings used to support the excitation generator shaft are relatively high, which increases the overall cost of the steam turbine generator set. Utility Model Content
[0003] The technical problem to be solved by this utility model is that currently, the excitation generator shaft is supported by sliding bearings, which leads to an increase in the overall cost of the steam turbine generator set.
[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a generator shaft support structure for supporting an excitation generator. The excitation generator has a first shaft, and the generator shaft support structure includes a rolling bearing, an elastic support ring, and a bearing housing. The bearing housing has a first mounting hole, the elastic support ring is disposed in the first mounting hole, and the outer peripheral side of the elastic support ring abuts against the hole wall of the first mounting hole. The rolling bearing is fixed in the annular cavity of the elastic support ring, and the first shaft is fixedly inserted through the inner hole of the rolling bearing.
[0005] As a preferred embodiment, the wall of the first mounting hole is provided with a first stop structure and a second stop structure protruding into the first mounting hole. The first stop structure and the second stop structure are arranged at intervals along the axial direction of the first mounting hole, and the rolling bearing is disposed in the interval between the first stop structure and the second stop structure.
[0006] As a preferred embodiment, the rolling bearing is spaced apart from the first stop structure along the axial direction of the first mounting hole, and the rolling bearing is also spaced apart from the second stop structure.
[0007] As a preferred embodiment, the first stop structure is a protrusion integrally formed on the inner wall of the first mounting hole, and the first stop structure is arranged at one end of the first mounting hole.
[0008] The bearing housing is detachably connected to an end cap at one end away from the first stop structure. The end cap has an annular protrusion at one end facing the first mounting hole, and the annular protrusion protrudes into the other end of the first mounting hole, forming the second stop structure.
[0009] As a preferred embodiment, the edge of the end cap is provided with a plurality of fasteners, each of which is axially spaced around the first mounting hole and is threadedly connected to the bearing seat.
[0010] As a preferred embodiment, the first mounting hole has a vertically arranged second mounting hole in its wall, and a top support is inserted through the second mounting hole, with the upper end of the top support abutting against the lower end of the elastic support ring.
[0011] As a preferred embodiment, the top support is a gas spring, which includes a cylinder and a telescopic rod inserted in the cylinder. The cylinder is fixed to the bearing seat, and the end of the telescopic rod away from the cylinder slides through the second mounting hole and abuts against the lower end of the elastic support ring.
[0012] A generator rotor support system includes a main generator rotor and an excitation generator rotor. The main generator rotor has a second shaft, and the excitation generator rotor has a first shaft. The first shaft and the second shaft are coaxial and fixedly connected. The first shaft is mounted on the aforementioned generator shaft support structure.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0014] The generator shaft support structure of this utility model includes a rolling bearing, an elastic support ring, and a bearing housing. The bearing housing has a first mounting hole, and the elastic support ring is disposed in the first mounting hole, with its outer periphery abutting against the hole wall of the first mounting hole. The rolling bearing is fixed in the annular cavity of the elastic support ring, and the shaft of the excitation generator is fixedly inserted through the inner hole of the rolling bearing. The elastic support ring is disposed between the hole wall of the first mounting hole and the rolling bearing. The elastic support ring can play the role of elastically supporting the shaft of the excitation generator. The elastic support ring is elastic, and its portion can contract after being compressed by the shaft of the excitation generator, thereby allowing the shaft of the excitation generator to float synchronously with the shaft of the main generator. Therefore, the generator shaft support structure of this utility model achieves a function similar to a sliding bearing by fixing an elastic support ring on the outside of the rolling bearing, greatly reducing the cost of the generator shaft support structure. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the generator rotor support system of this utility model;
[0016] Figure 2 This is a schematic diagram of the generator shaft support structure of this utility model;
[0017] In the figure, 100 is the excitation generator rotor, 101 is the shaft, 200 is the main generator rotor, 201 is the first shaft, 301 is the first sliding bearing bracket, 302 is the second sliding bearing bracket, 1 is the rolling bearing, 2 is the elastic support ring, 3 is the bearing seat, 31 is the first mounting hole, 32 is the second mounting hole, 33 is the protrusion, 4 is the end cover, 41 is the annular protrusion, 5 is the fastener, 6 is the gas spring, 61 is the cylinder, and 62 is the telescopic rod. Detailed Implementation
[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0019] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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 utility model. It should also be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.
[0020] like Figure 1 As shown, the generator rotor support system of this utility model includes a main generator rotor 200 and an excitation generator rotor 100. The main generator rotor 200 has a second rotating shaft 201, and the excitation generator rotor 100 has a first rotating shaft 101. The first rotating shaft 101 and the second rotating shaft 201 are coaxial and fixedly connected. The second rotating shaft 201 is mounted on a first sliding bearing bracket 301 and a second sliding bearing bracket 302, and the first rotating shaft 101 is mounted on a generator shaft support structure. The generator rotor support system adopts the following generator shaft support structure.
[0021] like Figure 2As shown, a preferred embodiment of the generator shaft support structure of this utility model includes a rolling bearing 1, an elastic support ring 2, and a bearing seat 3. The bearing seat 3 has a first mounting hole 31, and the elastic support ring 2 is disposed in the first mounting hole 31, with its outer periphery abutting against the hole wall of the first mounting hole 31. The rolling bearing 1 is fixed in the annular cavity of the elastic support ring 2, and the shaft is fixedly inserted into the inner hole of the rolling bearing 1. The elastic support ring 2 is disposed between the hole wall of the first mounting hole 31 and the rolling bearing 1, and can play the role of elastically supporting the shaft of the excitation generator. Moreover, the elastic support ring 2 is elastic, and its portion can contract after being compressed by the shaft of the excitation generator, thereby allowing the shaft of the excitation generator to float synchronously with the shaft of the main generator. Therefore, the generator shaft support structure of this utility model achieves a function similar to a sliding bearing by fixing the elastic support ring 2 on the outside of the rolling bearing 1, greatly reducing the cost of the generator shaft support structure.
[0022] The first mounting hole 31 has a first stop structure and a second stop structure protruding into it. These two stop structures are spaced apart along the axial direction of the first mounting hole 31, and the rolling bearing 1 is positioned within the gap between them. The first and second stop structures limit the movement of the rolling bearing 1, ensuring its stability within the first mounting hole 31.
[0023] Furthermore, in the axial direction of the first mounting hole 31, the rolling bearing 1 is spaced apart from the first stop structure, and the rolling bearing 1 is also spaced apart from the second stop structure. Specifically, since the thermal expansion of the main generator rotor 200 will cause the second shaft 201 to move axially, thereby causing the first bearing to be subjected to the axial force applied by the second bearing, in this embodiment, the two ends of the fixed bearing are spaced apart from the first stop structure and the second stop structure, respectively, so that the rolling bearing 1 can adaptively generate axial movement, thereby releasing the thermal stress generated by the thermal expansion of the main generator rotor 200, and avoiding deformation of the first shaft 101 or the second shaft 201 caused by the thermal stress generated by the thermal expansion of the main generator rotor 200 having nowhere to be released.
[0024] In this embodiment, the first stop structure is a protrusion 33 integrally formed on the inner wall of the first mounting hole 31, and the first stop structure is arranged at one end of the first mounting hole 31; the bearing seat 3 is detachably connected to an end cap 4 at the end opposite to the first stop structure, and the end cap 4 is provided with an annular protrusion 41 at the end facing the first mounting hole 31, and the annular protrusion 41 protrudes into the other end of the first mounting hole 31, forming a second stop structure.
[0025] Furthermore, when assembling the generator shaft support structure, after assembling the first shaft 101, the rolling bearing 1, and the elastic support ring 2, the end cover 4 is then connected to the bearing seat 3. The end cover 4 not only seals the first mounting hole 31 to prevent dust from entering the first mounting hole 31, but also serves to axially limit the first shaft 101.
[0026] Specifically, multiple fasteners 5 are provided on the edge of the end cover 4. Each fastener 5 is arranged axially around the first mounting hole 31 and is threadedly connected to the bearing seat 3.
[0027] In this embodiment, a vertically arranged second mounting hole 32 is provided in the wall of the first mounting hole 31. A top support member passes through the second mounting hole 32, and the upper end of the top support member abuts against the lower end of the elastic support ring 2. After the first rotating shaft 101 is assembled on the bearing seat 3, the height of the first bearing is finely adjusted by the top support member to ensure that the height of the first rotating shaft 101 and the second rotating shaft 201 are the same, which can improve the operational stability of the steam turbine generator.
[0028] Specifically, the top support is a gas spring 6, which includes a cylinder 61 and a telescopic rod 62 inserted in the cylinder 61. The cylinder 61 is fixed to the bearing seat 3, and the end of the telescopic rod 62 away from the cylinder 61 slides through the second mounting hole 32 and abuts against the lower end of the elastic support ring 2. In other embodiments of this utility model, the top support can be a pneumatic cylinder or a hydraulic cylinder.
[0029] In summary, the generator shaft support structure of this utility model includes a rolling bearing 1, an elastic support ring 2, and a bearing housing 3. The bearing housing 3 has a first mounting hole 31, the elastic support ring 2 is disposed in the first mounting hole 31, and the outer peripheral side of the elastic support ring 2 abuts against the hole wall of the first mounting hole 31. The rolling bearing 1 is fixed in the annular cavity of the elastic support ring 2, and the shaft of the excitation generator is fixedly inserted through the inner hole of the rolling bearing 1. The elastic support ring 2 is disposed between the hole wall of the first mounting hole 31 and the rolling bearing 1. The elastic support ring 2 can play the role of elastically supporting the shaft of the excitation generator. The elastic support ring 2 is elastic, and a part of the elastic support ring 2 can contract after being compressed by the shaft of the excitation generator, so that the shaft of the excitation generator can float synchronously with the shaft of the main generator. Therefore, the generator shaft support structure of this utility model achieves a function similar to a sliding bearing by fixing the elastic support ring 2 on the outside of the rolling bearing 1, which greatly reduces the cost of the generator shaft support structure.
[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A generator rotor shaft support structure for supporting an excitation generator having a first rotor shaft (101), characterized by, The rolling bearing (1), the elastic support ring (2) and the bearing seat (3); the bearing seat (3) has a first mounting hole (31), the elastic support ring (2) is arranged in the first mounting hole (31), and the outer circumferential side of the elastic support ring (2) is in abutment with the hole wall of the first mounting hole (31), the rolling bearing (1) is fixed in the ring cavity of the elastic support ring (2), and the first rotating shaft (101) is fixed and penetrates the inner hole of the rolling bearing (1).
2. The generator rotor shaft support structure of claim 1, wherein The hole wall of the first mounting hole (31) is provided with a first stop structure and a second stop structure protruding into the first mounting hole (31), the first stop structure and the second stop structure are arranged at intervals along the axial direction of the first mounting hole (31), and the rolling bearing (1) is arranged in the interval between the first stop structure and the second stop structure.
3. The generator rotor shaft support structure of claim 2, wherein In the axial direction of the first mounting hole (31), the rolling bearing (1) is arranged at intervals with the first stop structure and the second stop structure.
4. The generator rotor shaft support structure of claim 3, wherein The first stop structure is a protruding portion (33) integrally formed on the inner wall of the first mounting hole (31), and the first stop structure is arranged at one end of the first mounting hole (31). The end cover (4) is detachably connected to the end of the bearing seat (3) away from the first stop structure, the end cover (4) is provided with a ring-shaped protrusion (41) at one end facing the first mounting hole (31), the ring-shaped protrusion (41) protrudes into the other end of the first mounting hole (31), and the ring-shaped protrusion (41) forms the second stop structure.
5. The generator shaft support structure of claim 4, wherein, The edge of the end cover (4) is provided with a plurality of fasteners (5), and each fastener (5) is arranged at intervals along the axial direction of the first mounting hole (31), and each fastener (5) is threadedly connected to the bearing seat (3).
6. The generator rotor shaft support structure of claim 1, wherein, A second mounting hole (32) is arranged vertically in the hole wall of the first mounting hole (31), a supporting piece is arranged in the second mounting hole (32), and the upper end of the supporting piece is in abutment with the lower end of the elastic support ring (2).
7. The generator shaft support structure of claim 6, wherein, The supporting piece is a gas spring (6), the gas spring (6) comprises a cylinder (61) and a telescopic rod (62) inserted in the cylinder (61), the cylinder (61) is fixed to the bearing seat (3), and the end of the telescopic rod (62) away from the cylinder (61) slides through the second mounting hole (32) and is in abutment with the lower end of the elastic support ring (2).
8. A generator rotor support system characterized by, The main generator rotor (200) and the excitation generator rotor (100), the main generator rotor (200) has a second rotating shaft (201), the excitation generator rotor (100) has a first rotating shaft (101), the first rotating shaft (101) and the second rotating shaft (201) are coaxial and fixedly connected, and the first rotating shaft (101) is arranged on the generator rotating shaft support structure according to any one of claims 1 to 7.