A starting device for a low-pressure rotor of a gas turbine

Abstract

The present invention belongs to the technical field of gas turbines, and specifically relates to a starting device for a low-pressure rotor of a gas turbine, comprising a starting motor, a transmission shaft system, an overrunning clutch and a casing vibration isolation assembly; the vibration isolation shaft of the transmission shaft system is connected between the motor shaft of the starting motor and the low-pressure shaft of the low-pressure rotor; the casing vibration isolation assembly comprises an elastic support sleeve, an outer ring support sleeve and a casing support seat; the elastic support sleeve comprises an elastic deformation portion, a front ring portion and a rear ring portion; the elastic deformation portion is arranged between the front ring portion and the rear ring portion, and can bend, deform and reset; bearings are arranged between the front ring portion and the rear ring portion and the vibration isolation shaft; the elastic deformation portion and the rear ring portion are both fitted with a gap of the outer ring support sleeve; the outer ring support sleeve is connected to the casing of the gas turbine through the casing support seat. This scheme reduces the vibration transmitted to the gas turbine casing by the vibration isolation shaft through the deformation of the elastic support sleeve, and improves the stability of the low-pressure rotor operation when the gas turbine is tested or running.

Description

Technical Field

[0001] The invention belongs to the technical field of gas turbines, and in particular relates to a starting device for a low-pressure rotor of a gas turbine. Background Art

[0002] The rotor of a gas turbine mainly includes a high-pressure rotor and a low-pressure rotor. The low-pressure rotor generally refers to the integrated structure of a low-pressure compressor and a low-pressure turbine. Similarly, the high-pressure rotor refers to the integrated structure of a high-pressure compressor and a high-pressure turbine.

[0003] The starting device of a gas turbine can be divided into a high-pressure starting device and a low-pressure starting device. Among them, the low-pressure starting device is a structural form in which the starter directly drives the low-pressure rotor. When in use, the low-pressure starting device needs to be stably and reliably connected to the low-pressure rotor of the gas turbine, and the torque must be transmitted and maintained smoothly. After the gas turbine is successfully ignited and starts to accelerate, it will automatically disengage from the low-pressure rotor of the gas turbine to avoid reverse drag.

[0004] In actual use, the low-pressure starting device itself will generate vibrations when it is running. These vibrations will not only be transmitted to the low-pressure rotor along the transmission shaft system, but also to the casing through the bearings. In current technologies, most of them reduce certain vibrations through torque transmission of soft-connected shafts or precise position calibration of the starting device, but there is still the problem of vibration transmission. When part of the vibration is transmitted to the casing and the vibration of the low-pressure rotor and the casing are superimposed on each other, it will be easier to destroy the operating state of the gas turbine and cause safety hazards.

[0005] For this reason, it is necessary to design a starting device that can reduce the transmission of vibration to the casing. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a starting device for a low-pressure rotor of a gas turbine.

[0007] The technical solution adopted by the present invention is:

[0008] A starting device for a low-pressure rotor of a gas turbine comprises a starting motor, a transmission shaft system, an overrunning clutch and a casing vibration isolation assembly;

[0009] The transmission shaft system includes a vibration isolation shaft, the front end of the vibration isolation shaft is transmission-connected to the motor shaft of the starter motor, and the rear end of the vibration isolation shaft is transmission-connected to the low-pressure shaft of the low-pressure rotor;

[0010] The casing vibration isolation assembly includes an elastic support sleeve, an outer ring support sleeve and a casing support seat; the elastic support sleeve includes an elastic deformation portion, a front ring portion and a rear ring portion; the elastic deformation portion is arranged between the front ring portion and the rear ring portion, and can bend, deform and reset; bearings are arranged between the front ring portion and the vibration isolation shaft, and between the rear ring portion and the vibration isolation shaft; the front end of the outer ring support sleeve is fixedly connected to the front ring portion, and the rear ring portion is arranged on the inner side of the rear end of the outer ring support sleeve, and the elastic deformation portion and the rear ring portion are both matched with the outer ring support sleeve gap; the outer ring support sleeve is connected to the gas turbine casing through the casing support seat.

[0011] As an alternative or supplement to the above starting device: a plurality of long strip-shaped grid holes are arranged on the elastic deformation portion of the elastic support sleeve, and the length direction of the grid holes is parallel to the axial direction of the vibration isolation shaft.

[0012] As an alternative or supplement to the above starting device: an inner lubricating oil chamber is provided between the elastic deformation part and the vibration isolation shaft, an outer lubricating oil chamber is provided between the elastic deformation part and the outer ring support sleeve, and the elastic deformation part and the outer ring support sleeve are connected through a grid hole.

[0013] As an alternative or supplement to the above starting device: the outer side of the rear ring portion is sleeved with two elastic sealing rings, one in front and one in the back, and an oil film gap cavity is formed between the two elastic sealing rings.

[0014] As an alternative or supplement to the above starting device: a front oil seal assembly is provided between the front end of the front ring part and the vibration isolation shaft, and a rear oil seal assembly is provided between the rear end of the rear ring part and the vibration isolation shaft.

[0015] As an alternative or supplement to the above starting device: a flange portion is provided on the outer wall of the outer ring support sleeve, and the flange portion is located radially outside the gap between the outer ring support sleeve and the elastic support sleeve; the flange portion is connected to the casing support seat.

[0016] As an alternative or supplement to the above starting device: the outer side of the front ring portion has an extension disk extending radially outward, the front end surface of the outer ring support sleeve abuts against the extension disk, and the inner edge of the outer ring support sleeve protrudes inward and abuts against the root of the extension disk.

[0017] As an alternative or supplement to the above-mentioned starting device: the transmission shaft system also includes a coupling and a power transmission shaft, the front end of the vibration isolation shaft is coaxially connected to the rear end of the coupling, the front end of the coupling is coaxially connected to the motor shaft of the starting motor, the rear end of the vibration isolation shaft is coaxially connected to the front end of the power transmission shaft, and the rear end of the power transmission shaft is coaxially connected to the low-pressure shaft through an overrunning clutch.

[0018] As an alternative or supplement to the above-mentioned starting device: a motor support seat and a support base are connected below the starting motor, the support base is supported on the ground, the motor support seat is connected to the top of the support base, and the starting motor is installed on the motor support seat.

[0019] As an alternative or supplement to the above-mentioned starting device: position adjustment components are provided at the four corners of the motor support base, and the position adjustment components include front and rear adjustment screws, left and right adjustment screws and height adjustment screws; the axial directions of the front and rear adjustment screws, left and right adjustment screws and height adjustment screws are perpendicular to each other and are all threadedly connected to the motor support base to tighten different surfaces at the corners of the starting motor.

[0020] The beneficial effects of the present invention are as follows: in this solution, the vibration transmitted to the gas turbine casing by the vibration isolation axial direction is reduced through the deformation of the elastic support sleeve, and the stability of the operation of the low-pressure rotor is improved when the gas turbine is tested or operated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below.

[0022] Figure 1 It is a cross-sectional view of the overall structure of the starting device of the low-pressure rotor of the gas turbine in this scheme;

[0023] Figure 2 It is a local structural diagram of the elastic support sleeve;

[0024] Figure 3 It is a top view of the position adjustment assembly installed on the motor support base.

[0025] In the figure: 1-position adjustment assembly; 101-front and rear adjustment screws; 102-left and right adjustment screws; 103-height adjustment screws; 2-dust cover; 3-coupling; 4-vibration isolation shaft; 5-elastic support sleeve; 51-elastic deformation portion; 52-front ring portion; 53-rear ring portion; 55-grid hole; 56-external lubricating oil chamber; 57-internal lubricating oil chamber; 6-power transmission shaft; 7-overrunning clutch; 8-motor support seat; 9-support base; 10-low-pressure shaft; 11-casing support seat; 12-starting motor; 13-front bearing; 14-front oil seal assembly; 15-rear bearing; 16-rear oil seal assembly; 17-oil film slit cavity; 18-outer ring support sleeve; 19-elastic sealing ring. DETAILED DESCRIPTION

[0026] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only some of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of this solution.

[0027] like Figures 1 to 3As shown, this embodiment designs a starting device for a low-pressure rotor of a gas turbine, including a motor support seat 8, a support base 9, a starting motor 12, a transmission shaft system, an overrunning clutch 7 and a casing vibration isolation assembly.

[0028] The starter motor 12 can be a conventional DC motor or AC motor, and the specific model and power can be purchased according to actual needs.

[0029] The motor support seat 8 and the support base 9 are installed below the starter motor 12. The support base 9 is fixed on the ground or on a fixed base. The motor support seat 8 is detachably connected to the top of the support base 9. The motor support seat 8 can be replaced with different heights, so that the height of the starter motor 12 is equivalent to that of the gas turbine. The starter motor 12 is detachably installed on the motor support seat 8.

[0030] The upper part of the motor support seat 8 generally adopts a quadrilateral structure, and other shapes can also be adopted to match the lower part of the starter motor 12; when the quadrilateral structure is adopted, position adjustment components 1 are arranged at the four corners of the motor support seat 8, and each position adjustment component 1 includes components such as a front and rear adjustment screw 101, a left and right adjustment screw 102, and a height adjustment screw 103. The front and rear adjustment screw 101, the left and right adjustment screw 102, and the height adjustment screw 103 are all threadedly connected to the motor support seat 8, and the axial directions of the front and rear adjustment screw 101, the left and right adjustment screw 102, and the height adjustment screw 103 are perpendicular to each other. Each adjusting screw is used to tighten different surfaces at the corner of the starter motor 12; specifically: when the front and rear adjusting screws 101 are adjusted for tightness, it is convenient to fine-tune the front and rear directions of the corner of the starter motor 12, and when the front and rear adjusting screws 101 are tightened, the tips of the front and rear adjusting screws 101 can press against the front side elevation or the rear side elevation of the connection part of the starter motor 12; when the front and rear adjusting screws 101 are adjusted for tightness, it is convenient to fine-tune the left and right directions of the corner of the starter motor 12, and when the left and right adjusting screws 102 are tightened, the tips of the left and right adjusting screws 102 can press against the left side elevation or the left side elevation of the connection part of the starter motor 12; when the height adjusting screw 103 is adjusted for tightness, it is convenient to fine-tune the height of the corner of the starter motor 12, and when the height adjusting screw 103 is tightened, the tip of the height adjusting screw 103 can press against the bottom surface of the connection part of the starter motor 12.

[0031] The transmission shaft system includes a coupling 3, a force transmission shaft 6, a vibration isolation shaft 4 and other shafts. The front end of the vibration isolation shaft 4 is connected to the motor shaft of the starter motor 12 in a transmission manner. Specifically, the front end of the vibration isolation shaft 4 is coaxially connected to the rear end of the coupling 3, and the front end of the coupling 3 is coaxially connected to the motor shaft of the starter motor 12. The rear end of the vibration isolation shaft 4 is connected to the low-pressure shaft 10 of the low-pressure rotor in a transmission manner. Specifically, the rear end of the vibration isolation shaft 4 is coaxially connected to the front end of the force transmission shaft 6, and the rear end of the force transmission shaft 6 is coaxially connected to the low-pressure shaft 10 through an overrunning clutch 7. The overrunning clutch 7 can be disconnected from the transmission relationship with the transmission shaft system after the gas turbine is started, thereby preventing the gas turbine from causing reverse drag on the starter motor 12.

[0032] The casing vibration isolation assembly includes components such as an elastic support sleeve 5, an outer ring support sleeve 18 and a casing support seat 11.

[0033] The elastic support sleeve 5 includes an elastic deformation portion 51, a front ring portion 52 and a rear ring portion 53; the front ring portion 52 is located in front of the rear ring portion 53, and the elastic deformation portion 51 is arranged between the front ring portion 52 and the rear ring portion 53. The thickness of the elastic deformation portion 51 is thinner than that of the front ring portion 52 and the rear ring portion 53, so that the elastic deformation portion 51 can undergo a certain bending deformation, so that the front ring portion 52 and the rear ring portion 53 can be displaced from each other, and the elastic deformation portion 51 can be used for resetting the front ring portion 52 and the rear ring portion 53 when they are displaced and deformed.

[0034] A front bearing 13 is provided between the front ring portion 52 and the vibration isolation shaft 4, and a portion of the vibration of the vibration isolation shaft 4 in the radial direction will be transmitted to the front ring portion 52 through the front bearing 13; a rear bearing 15 is provided between the rear ring portion 53 and the vibration isolation shaft 4, and a portion of the vibration of the vibration isolation shaft 4 in the radial direction will be transmitted to the rear ring portion 53 through the rear bearing 15. Since the elastic deformation portion 51 can be bent and deformed, the vibration transmission between the rear ring portion 53 and the front ring portion 52 is reduced.

[0035] The front end of the outer ring support sleeve 18 is fixedly connected to the front ring portion 52, and the rear ring portion 53 is arranged on the inner side of the rear end of the outer ring support sleeve 18. The elastic deformation portion 51 and the rear ring portion 53 are both matched with the gap of the outer ring support sleeve 18. Due to the gap between the outer ring support and the elastic support sleeve 5, the vibration transmitted from the rear ring portion 53 to the outer ring support seat is reduced. Since the outer ring support sleeve 18 is connected to the gas turbine casing through the casing support seat 11, after the vibration of the outer ring support seat is reduced, the vibration transmitted to the gas turbine casing through the casing support seat 11 is also reduced accordingly. When the vibration of the turbine rotor remains unchanged, the vibration of the gas turbine casing is weakened, which can reduce the occurrence of the superposition of the vibrations of the two, thereby improving the stability and reliability of the gas turbine during operation.

[0036] The elastic deformation part 51 of the elastic support sleeve 5 is provided with a plurality of long strip-shaped grid holes 55, and the length direction of the grid holes 55 is parallel to the axial direction of the vibration isolation shaft 4. The long strip-shaped grid holes 55 can not only increase the deformation amount of the elastic deformation part 51, but also make the deformation amount of the elastic deformation part 51 more controllable by designing the number and length and width of the long strip-shaped grid holes 55.

[0037] An inner lubricating oil chamber 57 is provided between the elastic deformation part 51 and the vibration isolation shaft 4, an outer lubricating oil chamber 56 is provided between the elastic deformation part 51 and the outer ring support sleeve 18, and the elastic deformation part 51 and the outer ring support sleeve 18 are connected through a grid hole 55; when the vibration isolation shaft 4 vibrates, and when the rear ring part 53 and the outer ring support sleeve 18 move relative to each other, the lubricating oil in the inner lubricating oil chamber 57 and the outer lubricating oil chamber 56 can absorb the vibration, thereby weakening the vibration.

[0038] The outer side of the rear ring portion 53 is sleeved with two elastic sealing rings 19, one in front and one in the back, and an oil film gap cavity 17 is formed between the two elastic sealing rings 19. The oil film gap cavity 17 can not only improve the sealing performance of the rear ring portion 53 and the outer ring support sleeve 18 for lubricating oil, but also weaken the transmission of vibration.

[0039] A front oil seal assembly 14 is provided between the front end of the front ring portion 52 and the vibration isolation shaft 4, and a rear oil seal assembly 16 is provided between the rear end of the rear ring portion 53 and the vibration isolation shaft 4. The main function of the front oil seal assembly 14 and the rear oil seal assembly 16 is to seal the lubricating oil at the front bearing 13 and the rear bearing 15.

[0040] A flange is provided on the outer wall of the outer ring support sleeve 18, and the flange is located radially outside the gap between the outer ring support sleeve 18 and the elastic support sleeve 5; the flange is connected to the casing support seat 11. When designing the front and rear positions of the flange, it is necessary to consider controlling the transmitted vibration amount within the required range and ensuring reliable support for the vibration isolation shaft 4.

[0041] The outer side of the front ring portion 52 has an extension disk extending radially outward, the front end surface of the outer ring support sleeve 18 abuts against the extension disk, and the inner edge of the outer ring support sleeve 18 protrudes inward and abuts against the root of the extension disk.

[0042] When the vibration of the transmission shaft system itself is small, the coupling 3 can be made of a rigid material to transmit the torque backward more stably; and when the vibration of the transmission shaft system itself is small, the coupling 3 can also be replaced with a flexible material to reduce the vibration transmission between the starter motor 12 and the vibration isolation shaft 4.

[0043] A dust cover 2 may be provided outside the coupling 3. The dust cover 2 is cylindrical, the front end of the dust cover 2 is connected to the casing of the starter motor 12, and the rear end is connected to the outer ring support sleeve 18, thereby improving the dustproof performance.

[0044] The above embodiments are merely examples for the purpose of clarifying the description, and are not intended to limit the implementation methods; it is not necessary and impossible to list all implementation methods exhaustively. However, obvious changes or modifications derived therefrom are still within the scope of protection of the present technology.

Claims

1. A starting device for a low-pressure rotor of a gas turbine, characterized in that: It comprises a starting motor (12), a transmission shaft system, an overrunning clutch (7) and a casing vibration isolation assembly; The transmission shaft system comprises a vibration isolation shaft (4), the front end of the vibration isolation shaft (4) being transmission-connected to the motor shaft of the starter motor (12), and the rear end of the vibration isolation shaft (4) being transmission-connected to the low-pressure shaft (10) of the low-pressure rotor; The casing vibration isolation assembly comprises an elastic support sleeve (5), an outer ring support sleeve (18) and a casing support seat (11); the elastic support sleeve (5) comprises an elastic deformation portion (51), a front ring portion (52) and a rear ring portion (53); the elastic deformation portion (51) is arranged between the front ring portion (52) and the rear ring portion (53), and is capable of bending deformation and resetting; bearings are arranged between the front ring portion (52) and the vibration isolation shaft (4), and between the rear ring portion (53) and the vibration isolation shaft (4); the front end of the outer ring support sleeve (18) is fixedly connected to the front ring portion (52), the rear ring portion (53) is arranged on the inner side of the rear end of the outer ring support sleeve (18), and the elastic deformation portion (51) and the rear ring portion (53) are both gap-matched with the outer ring support sleeve (18); the outer ring support sleeve (18) is connected to the gas turbine casing through the casing support seat (11); A plurality of long strip-shaped grid holes are provided on the elastic deformation portion (51) of the elastic support sleeve (5), and the length direction of the grid holes is parallel to the axial direction of the vibration isolation shaft (4); An inner lubricating oil chamber is provided between the elastic deformation portion (51) and the vibration isolation shaft (4), an outer lubricating oil chamber is provided between the elastic deformation portion (51) and the outer ring support sleeve (18), and the elastic deformation portion (51) and the outer ring support sleeve (18) are connected via a grid hole; The outer side of the rear ring portion (53) is sleeved with two elastic sealing rings (19), one in front and one in the back, and an oil film slot cavity (17) is formed between the two elastic sealing rings (19); A front oil seal assembly (14) is provided between the front end of the front ring portion (52) and the vibration isolation shaft (4), and a rear oil seal assembly (16) is provided between the rear end of the rear ring portion (53) and the vibration isolation shaft (4).

2. The starting device for the low-pressure rotor of a gas turbine according to claim 1, characterized in that: A flange portion is provided on the outer wall of the outer ring support sleeve (18), and the flange portion is located radially outside the gap between the outer ring support sleeve (18) and the elastic support sleeve (5); the flange portion is connected to the casing support seat (11).

3. The starting device for the low-pressure rotor of a gas turbine according to claim 2, characterized in that: The outer side of the front ring portion (52) has an extension disk extending radially outward, the front end surface of the outer ring support sleeve (18) abuts against the extension disk, and the inner edge of the outer ring support sleeve (18) protrudes inward and abuts against the root of the extension disk.

4. The starting device for the low-pressure rotor of a gas turbine according to claim 1, characterized in that: The transmission shaft system also includes a coupling (3) and a power transmission shaft (6); the front end of the vibration isolation shaft (4) is coaxially connected to the rear end of the coupling (3); the front end of the coupling (3) is coaxially connected to the motor shaft of the starter motor (12); the rear end of the vibration isolation shaft (4) is coaxially connected to the front end of the power transmission shaft (6); and the rear end of the power transmission shaft (6) is coaxially connected to the low-pressure shaft (10) via an overrunning clutch (7).

5. The starting device for the low-pressure rotor of a gas turbine according to claim 1, characterized in that: A motor support seat (8) and a support base (9) are connected below the starter motor (12); the support base (9) is supported on the ground; the motor support seat (8) is connected to the top of the support base (9); and the starter motor (12) is mounted on the motor support seat (8).

6. The starting device for the low-pressure rotor of a gas turbine according to claim 5, characterized in that: Position adjustment components (1) are provided at the four corners of the motor support seat (8), and the position adjustment components (1) include front and rear adjustment screws (101), left and right adjustment screws (102), and height adjustment screws (103); the axial directions of the front and rear adjustment screws (101), left and right adjustment screws (102), and height adjustment screws (103) are mutually perpendicular and are all threadedly connected to the motor support seat (8) to tighten against different surfaces at the corners of the starter motor (12).

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