Rotor system and gas turbine power generation system
By segmenting the shaft of the gas turbine and buffering the coaxial difference with adaptive deformation coupling and air bearing, the problem of design difficulty of long shafts and multiple bearings is solved, and the stability and reliability of the system are improved.
Patent Information
- Application Number
- CN202420781923.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-16
AI Technical Summary
In gas turbines, the design of long rotating shafts and multiple radial bearings leads to difficulty in coaxial design, which easily leads to damage to the rotating shaft.
The coupling is used to divide the rotating shaft into two sections, and the adaptive deformation structure of the coupling and the air bearing buffer coaxial differences to reduce the difficulty of design and assembly.
Effectively buffers the coaxial difference between the shaft and the bearing, reduces the possibility of coupling damage, and simplifies the design and assembly process.
Smart Images
Figure CN222276796U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas turbine equipment, in particular to a rotor system and a gas turbine power generation system. Background Art
[0002] Rotor systems with rotating shafts are widely used. When the rotating shaft is long and heavy, three or more radial bearings are usually required for support. However, this makes it difficult to design the coaxiality between multiple bearings and can easily lead to damage to the rotating shaft.
[0003] A gas turbine uses a continuously flowing gas as a working fluid to drive the impeller to rotate at high speed, converting the energy of the fuel into useful work. It is a rotating impeller heat engine. It mainly includes three parts: a compressor, a combustion chamber, and a turbine. The compressor inhales air from the external atmosphere and compresses it to increase the pressure, and the air temperature is also increased accordingly; the compressed air is sent to the combustion chamber to mix with the injected fuel and burn to generate high-temperature and high-pressure gas; then it enters the turbine to expand and do work, driving the turbine to drive the compressor (and the external load rotor) to rotate at high speed, which can realize the partial conversion of the chemical energy of the gas or liquid fuel into mechanical work and heat energy, and can also output electrical energy by connecting to a generator.
[0004] When a gas turbine is connected to a generator to form a power generation system, the shaft of the rotor system is very long and needs to be supported by three or more radial bearings. This makes it difficult to design the coaxiality between multiple bearings and easily causes damage to the shaft. Utility Model Content
[0005] The utility model aims to provide a rotor system and a gas turbine power generation system in view of the deficiencies in the prior art.
[0006] A rotor system includes a first rotating shaft, a second rotating shaft and a coupling arranged between the first rotating shaft and the second rotating shaft, the coupling includes a first end head and a second end head, the first end head and the second end head are symmetrically arranged in opposite directions, the middle part of the coupling can be bent and deformed, the first end head is provided with an axially concave groove and is connected to one end of the first rotating shaft, and the second end head is provided with an axially concave groove and is connected to one end of the second rotating shaft.
[0007] Furthermore, the coupling also includes a connecting portion, the first end head and the second end head are symmetrically and oppositely arranged at two ends of the connecting portion, and the diameter of the connecting portion is smaller than the diameters of the first end head and the second end head.
[0008] Furthermore, a first thin-wall structure and a second thin-wall structure are provided at a position close to the connection portion on the first end, and / or a third thin-wall structure and a fourth thin-wall structure are provided at a position close to the connection portion on the second end.
[0009] Furthermore, the first end head and the first rotating shaft are plug-connected, a radial gap is provided between the first end head and the first rotating shaft, and the cross-section of the plug-connected portion of the first end head and the first rotating shaft may be a polygon.
[0010] Furthermore, the coupling is in the shape of a tube sleeve, the first end head and the second end head are located at two end positions of the coupling, a middle part is arranged between the first end head and the second end head, and the middle part is provided with a corrugated structure.
[0011] A gas turbine power generation system comprises the above-mentioned rotor system, and also comprises a compressor, a turbine and a generator, wherein the compressor and the turbine are mounted on a first rotating shaft, and the generator is mounted on a second rotating shaft.
[0012] Furthermore, a first radial bearing and a second radial bearing are arranged on the first rotating shaft, and a third radial bearing and a fourth radial bearing are arranged on the second rotating shaft.
[0013] Furthermore, a thrust plate is arranged on the first rotating shaft, and a thrust air bearing is arranged on both sides of the thrust plate respectively; the two thrust air bearings are located between the first radial bearing and the second radial bearing.
[0014] Furthermore, the first radial bearing and the second radial bearing are air bearings.
[0015] Furthermore, the third radial bearing and the fourth radial bearing are any one of air bearings or ball bearings.
[0016] The advantages of the utility model compared with the prior art are:
[0017] First, this solution divides the gas turbine shaft and the motor shaft into two sections and connects them with a coupling to avoid the coaxiality problems of the overly long shaft and multiple bearings, which makes the design, processing and assembly too difficult. A coupling that can withstand a certain amount of deformation is used to buffer the coaxial difference between the two shafts.
[0018] Second: the first radial bearing, the second radial bearing, the third radial bearing and the fourth radial bearing in this scheme adopt air bearings (loaded by air film, not foil type), wherein the air film can further buffer the coaxial difference between the two rotating shafts and reduce the possibility of coupling damage caused by the coaxial difference.
[0019] Third: In this scheme, the first end head has an axially concave groove and is fixedly connected to the axial docking part of the first rotating shaft, which can be connected by interference fit or welding, and the groove can be cylindrical; the second end head has an axially concave groove and is fixedly connected to the axial docking part of the second rotating shaft, which can be connected by interference fit or welding, and the groove can be cylindrical; the connecting part is a rod-shaped part with a diameter smaller than the diameter of the first end head and the second end head, so that when there is a coaxial difference between the first rotating shaft and the second rotating shaft, the difference can be buffered by bending.
[0020] Fourthly, in the present embodiment, the portion of the first end near the connection portion comprises a first thin-wall structure and a second thin-wall structure, and the portion of the second end near the connection portion comprises a third thin-wall structure and a fourth thin-wall structure. The coaxial difference between the first rotating shaft and the second rotating shaft is buffered by the deformation of the first thin-wall structure, the second thin-wall structure, the third thin-wall structure and the fourth thin-wall structure.
[0021] Fifth: The coupling in this scheme can be in the shape of a sleeve, and the two ends of the coupling are respectively fixedly connected to the first rotating shaft and the outer peripheral surface of the middle part of the coupling can be provided with a ruler-shaped structure or a corrugated structure. The coaxial difference between the first rotating shaft and the second rotating shaft can be buffered by the deformation of the middle part. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 The overall structure of the gas turbine is shown in Figure 1. Figure 1 ;
[0023] Figure 2 The overall structure of the gas turbine is shown in Figure 1. Figure 2 ;
[0024] Figure 3 This is a schematic structural diagram of the first implementation mode of the coupling in this scheme;
[0025] Figure 4 It is a structural schematic diagram of the second implementation mode of the coupling in this scheme;
[0026] Figure 5 for Figure 4 Sectional view at the middle BB;
[0027] Figure 6 This is a schematic structural diagram of the third implementation mode of the coupling in this scheme.
[0028] Figure numerals: first rotating shaft 110, thrust plate 111, second rotating shaft 120, compressor 200, turbine 300, generator 400, first radial bearing 510, second radial bearing 520, thrust air bearing 530, third radial bearing 540, fourth radial bearing 550, fifth radial bearing 560, coupling 600, first end head 610, first thin-walled structure 611, second thin-walled structure 612, second end head 620, third thin-walled structure 621, fourth thin-walled structure 622, connecting portion 630. DETAILED DESCRIPTION
[0029] Combined with Figure 1-6 As shown, a rotor system includes a first rotating shaft 110 and a second rotating shaft 120, the first rotating shaft 110 and the second rotating shaft 120 are connected by a coupling 600, a first radial bearing 510 and a second radial bearing 520 are arranged on the first rotating shaft 110, and a third radial bearing 540 and a fourth radial bearing 550 are arranged on the second rotating shaft 120, and the coupling 600 can be a coupling 600 with an adaptive deformation structure to buffer the coaxial difference between the first rotating shaft 110 and the second rotating shaft 120, thereby reducing the difficulty of designing, processing and assembling the rotating shafts and bearings.
[0030] A gas turbine power generation system includes a first rotating shaft 110 and a second rotating shaft 120; a compressor 200 and a turbine 300 sleeved on the first rotating shaft 110; and a generator 400 sleeved on the second rotating shaft 120. The first rotating shaft 110 and the second rotating shaft 120 are connected by a coupling 600. The first rotating shaft 110, the compressor 200 and the turbine 300 can rotate synchronously and drive the generator 400 to generate electricity through the coupling 600. The gas turbine also includes a combustion chamber (not shown in the figure), which can be a single-tube combustion chamber or an annular combustion chamber.
[0031] like Figure 1 As shown, a first radial bearing 510 and a second radial bearing 520 are arranged on the first rotating shaft 110 . The first radial bearing 510 and the second radial bearing 520 may be located between the compressor 200 and the turbine 300 , so as to support the first rotating shaft 110 .
[0032] Furthermore, if Figure 2 As shown, a second radial bearing 520 and a fifth radial bearing 560 may be provided between the thrust plate 111 and the turbine 300 to increase the radial bearing capacity at the turbine end.
[0033] A third radial bearing 540 and a fourth radial bearing 550 are arranged on the second rotating shaft 120 . The third radial bearing 540 and the fourth radial bearing 550 may be located at both sides of the generator 400 .
[0034] The coupling 600 may be a coupling with an adaptive deformation structure to buffer the coaxial difference between the first rotating shaft 110 and the second rotating shaft 120 and reduce the difficulty of designing, processing and assembling the rotating shaft and the bearing.
[0035] Furthermore, the first radial bearing 510 and the second radial bearing 520 can be air bearings, especially air bearings without a foil structure. Such air bearings have a larger air film gap with the rotating shaft (especially compared with foil air bearings). In this way, the first rotating shaft 110 is supported only by the air film between the bearing and the rotating shaft, and due to the existence of the air film gap, the coaxial difference between the first rotating shaft 110 and the second rotating shaft 120 can be further buffered.
[0036] Specifically, the first radial bearing 510 and the second radial bearing 520 may be dynamic and static pressure hybrid bearings or self-static pressure bearings, etc.
[0037] Further, the first rotating shaft 110 may include a thrust disk 111 , and thrust air bearings 530 are disposed on both sides of the thrust disk 111 . The thrust air bearings 530 may be located between the first radial bearing 510 and the second radial bearing 520 .
[0038] Furthermore, the third radial bearing 540 and the fourth radial bearing 550 may be air bearings, and further may be foil dynamic pressure air bearings, or the third radial bearing 540 and the fourth radial bearing 550 may also be ball bearings.
[0039] Furthermore, if Figure 2 As shown, the coupling 600 includes a first end 610, a second end 620 and a connecting portion 630 connecting the two ends.
[0040] The first end 610 has an axially concave groove and is fixedly connected to the axial butt joint of the first rotating shaft 110, which may be connected by interference fit or welding, and the groove may be cylindrical;
[0041] The second end 620 has an axially concave groove and is fixedly connected to the axial butt joint of the second rotating shaft 120, which can be connected by interference fit or welding. The groove can be cylindrical;
[0042] The connecting portion 630 is in the shape of a rod having a diameter smaller than that of the first end 610 and the second end 620 , so that when there is a coaxial difference between the first rotating shaft 110 and the second rotating shaft 120 , the difference can be buffered by bending.
[0043] Furthermore, the portion of the first end 610 close to the connecting portion 630 comprises a first thin-walled structure 611 and a second thin-walled structure 612, and the portion of the second end 620 close to the connecting portion 630 comprises a third thin-walled structure 621 and a fourth thin-walled structure 622, and the coaxial difference between the first rotating shaft 110 and the second rotating shaft 120 is buffered by the deformation of the first thin-walled structure 611, the second thin-walled structure 612, the third thin-walled structure 621 and the fourth thin-walled structure 622.
[0044] Furthermore, if Figure 3 and Figure 4 As shown, the axial connection between the first end 610 and the first rotating shaft 110 may be a plug-in connection. Figure 4 As shown, there may be a radial gap between the first end 610 and the first shaft 110 for easy docking. The cross section of the portion where the first end 610 and the first shaft 110 are plugged may be a polygon, such as a triangle, quadrilateral, pentagon or hexagon, so as to achieve transmission of rotation.
[0045] Furthermore, the coupling 600 may be in the shape of a sleeve, and the two ends 610 and 620 of the coupling 600 are fixedly connected to the first rotating shafts 110 and 120 respectively. The outer peripheral surface of the middle part 630 of the coupling 600 may be provided with a ruler structure or a corrugated structure, so that the coaxial difference between the first rotating shaft 110 and the second rotating shaft 120 can be buffered by the deformation of the middle part 630.
[0046] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.
[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0048] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0049] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A rotor system, characterized in that: It includes a first rotating shaft, a second rotating shaft and a coupling arranged between the first rotating shaft and the second rotating shaft, the coupling includes a first end head and a second end head, the first end head and the second end head are symmetrically and oppositely arranged, the middle part of the coupling can be bent and deformed, the first end head is provided with an axially concave groove and is connected to one end of the first rotating shaft, the second end head is provided with an axially concave groove and is connected to one end of the second rotating shaft.
2. The rotor system according to claim 1, characterized in that The coupling further comprises a connecting portion, wherein the first end head and the second end head are symmetrically and oppositely arranged at two ends of the connecting portion, and a diameter of the connecting portion is smaller than a diameter of the first end head and the second end head.
3. The rotor system according to claim 1, characterized in that A first thin-wall structure and a second thin-wall structure are disposed at a position close to the connection portion on the first end, and / or a third thin-wall structure and a fourth thin-wall structure are disposed at a position close to the connection portion on the second end.
4. The rotor system according to claim 1, characterized in that The first end head is plug-connected to the first rotating shaft, a radial gap is provided between the first end head and the first rotating shaft, and the cross-section of the plug-connected portion of the first end head and the first rotating shaft is a polygon.
5. The rotor system according to claim 1, characterized in that The coupling is in the shape of a tube sleeve, the first end head and the second end head are located at two end positions of the coupling, a middle part is arranged between the first end head and the second end head, and the middle part is provided with a corrugated structure.
6. A gas turbine power generation system, characterized in that: The rotor system comprises the rotor system according to any one of claims 1 to 5, and further comprises a compressor, a turbine and a generator, wherein the compressor and the turbine are mounted on a first rotating shaft, and the generator is mounted on a second rotating shaft.
7. The gas turbine power generation system according to claim 6, characterized in that: The first rotating shaft is provided with a first radial bearing and a second radial bearing, and the second rotating shaft is provided with a third radial bearing and a fourth radial bearing.
8. The gas turbine power generation system according to claim 7, characterized in that: A thrust plate is disposed on the first rotating shaft, and a thrust air bearing is disposed on both sides of the thrust plate respectively; the two thrust air bearings are located between the first radial bearing and the second radial bearing.
9. The gas turbine power generation system according to claim 7, characterized in that: The first radial bearing and the second radial bearing are air bearings.
10. The gas turbine power generation system according to claim 7, characterized in that: The third radial bearing and the fourth radial bearing are any one of air bearings or ball bearings.