Gas-steam combined cycle unit control device

Abstract

The utility model belongs to the technical field of generators, and particularly relates to a gas-steam combined cycle unit control device which comprises two sun gears connected with the power output end of a steam turbine and the power output end of a gas turbine respectively, the tooth surfaces of the two sun gears are oppositely arranged, and the two sun gears are jointly connected with a plurality of planetary gears in a meshed mode. The planetary gear is rotationally connected with a gear carrier through a gear shaft, a driving gear is fixedly connected to the outer side face of the gear carrier and is in meshed connection with a driven gear, and an output shaft used for driving a power generator to work is fixedly connected to the axis of the driven gear; the steam turbine and the gas turbine drive the two sun gears to rotate in the same direction, energy waste caused by different rotating speeds when the gas turbine and the steam turbine drive the generator to work can be avoided, and power output by the steam turbine and the gas turbine can effectively drive the generator to work.

Description

Technical Field

[0001] This utility model belongs to the field of generator technology, specifically relating to a control device for a gas-steam combined cycle unit. Background Technology

[0002] A gas turbine combined cycle unit generates high-temperature, high-pressure gas through combustion in a gas turbine, which drives a turbine to generate electricity. The high-temperature exhaust gas enters a waste heat boiler to heat water and generate steam. The steam then drives a steam turbine to generate electricity, thus integrating the gas turbine cycle and the steam turbine cycle.

[0003] The gas turbine and steam turbine are connected to the generator via couplings. When the speed of the steam turbine is less than that of the generator, the couplings automatically disengage, thereby preventing the steam turbine from braking the generator and achieving the goal of the gas turbine and steam turbine jointly driving the generator. However, when the couplings automatically disengage, energy is wasted. Utility Model Content

[0004] To address the problems mentioned in the background section, this invention provides a control device for a gas-steam combined cycle unit, which can avoid energy waste caused by the different speeds of the gas turbine and steam turbine driving the generator.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a control device for a gas-steam combined cycle unit, comprising two sun gears respectively connected to the power output ends of a steam turbine and a gas turbine, the tooth surfaces of the two sun gears being arranged opposite each other, the two sun gears being meshed with a plurality of planetary gears, the planetary gears being rotatably connected to a gear carrier via gear shafts, a driving gear being fixedly connected to the outer side of the gear carrier, the driving gear being meshed with a driven gear, and an output shaft for driving a generator being fixedly connected to the shaft center of the driven gear;

[0006] Steam turbines and gas turbines drive two sun gears to rotate in the same direction.

[0007] As a preferred embodiment of the control device for a gas-steam combined cycle unit according to this utility model, both the driving gear and the driven gear have herringbone teeth.

[0008] As a preferred embodiment of the control device for a gas-steam combined cycle unit according to this utility model, the tooth surface of the sun gear is recessed, and the radial position of the middle part of the planetary gear protrudes outward.

[0009] As a preferred embodiment of the control device for a gas-steam combined cycle unit according to this utility model, the width of the drive gear can cover the outer surface of the sun gear.

[0010] As a preferred embodiment of the control device for a gas-steam combined cycle unit of this utility model, a coaxial sleeve is fixedly connected at the central position of the gear carrier, and an inner shaft is fixedly connected at the center of the shaft on the side of the sun gear facing the gear carrier, with the inner shaft rotatably connected to the coaxial sleeve.

[0011] As a preferred embodiment of the control device for a gas-steam combined cycle unit of this utility model, it further includes a housing for the control device, with a mating sleeve fixedly connected to the inner side of the housing, and a boss fixedly connected to the axis on the side of the sun gear away from the gear carrier, and the mating sleeve and the boss being rotatably connected.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This control device can avoid energy waste caused by the different speeds of the gas turbine and steam turbine when driving the generator. The power output ends of the steam turbine and gas turbine drive two sun gears to rotate in the same direction through input shaft A and input shaft B, respectively. Planetary gears are meshed between the two sun gears. Regardless of whether the rotation speeds of the two sun gears are the same, they can jointly drive the planetary gears to revolve. Thus, when the planetary gears revolve, they drive the gear carrier to rotate. The gear carrier drives the driving gear to rotate, and the driving gear drives the driven gear to rotate. The driven gear drives the generator to work through the output shaft, so that the power output of the steam turbine and gas turbine can effectively drive the generator to work, avoiding energy waste. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0016] Figure 3 This is an exploded view of the internal structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the planetary gear and sun gear in this utility model;

[0018] Figure 5 This is a schematic diagram of the area covered by the drive gear in this utility model;

[0019] In the picture:

[0020] 1. Sun gear; 2. Planetary gear; 3. Gear carrier; 31. Driving gear; 4. Driven gear; 5. Output shaft; 6. Input shaft A; 7. Input shaft B;

[0021] 8. Coaxial sleeve; 9. Inner shaft;

[0022] 10. Boss; 11. Mating sleeve; 12. Outer shell. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1-5 As shown:

[0025] A control device for a gas-steam combined cycle unit includes two sun gears 1 connected to the power output ends of a steam turbine and a gas turbine, respectively. The tooth surfaces of the two sun gears 1 are arranged opposite each other, and the two sun gears 1 are meshed with a plurality of planetary gears 2. The planetary gears 2 are rotatably connected to a gear carrier 3 through a gear shaft. A driving gear 31 is fixedly connected to the outer side of the gear carrier 3. The driving gear 31 is meshed with a driven gear 4. An output shaft 5 for driving a generator is fixedly connected to the shaft of the driven gear 4.

[0026] The steam turbine and gas turbine drive the two sun gears 1 to rotate in the same direction.

[0027] In this embodiment, the gas turbine combined cycle unit generates high-temperature and high-pressure gas through combustion in a gas turbine to drive a turbine to generate electricity. The high-temperature exhaust gas discharged from the turbine enters a waste heat boiler to heat water and generate steam. The steam then drives a steam turbine to drive a generator to generate electricity, thereby integrating the gas turbine cycle and the steam turbine cycle.

[0028] The gas turbine and steam turbine are connected to the generator via couplings. When the speed of the steam turbine is less than that of the generator, the couplings automatically disengage, thereby preventing the steam turbine from braking the generator and achieving the goal of the gas turbine and steam turbine jointly driving the generator. However, when the couplings automatically disengage, energy is wasted.

[0029] This control device avoids energy waste caused by the different speeds of the gas turbine and steam turbine when driving the generator. The power output ends of the steam turbine and gas turbine drive two sun gears 1 to rotate in the same direction through input shafts A6 and B7, respectively. Planetary gears 2 are meshed between the two sun gears 1. Regardless of whether the rotation speeds of the two sun gears 1 are the same, they can jointly drive the planetary gears 2 to revolve. As the planetary gears 2 revolve, they drive the gear carrier 3 to rotate. The gear carrier 3 drives the driving gear 31 to rotate, and the driving gear 31 drives the driven gear 4 to rotate. The driven gear 4 drives the generator through the output shaft 5, so that the power output from the steam turbine and gas turbine can effectively drive the generator and avoid energy waste.

[0030] In an optional embodiment, both the driving gear 31 and the driven gear 4 have herringbone teeth. Since the torque required to drive the generator is large, the herringbone tooth structure can achieve better load-bearing capacity and improve the smoothness of transmission.

[0031] In an optional embodiment, the tooth surface of the sun gear 1 is recessed, and the central radial position of the planetary gear 2 protrudes outward.

[0032] In this embodiment, in a traditional planetary gear transmission system, both the sun gear 1 and the planet gear 2 are bevel-shaped structures. However, for those in the art, the structure of ordinary planetary gear transmission systems cannot meet the torque requirements, or even if the torque requirements are met, the service life is short and the failure rate is high. This is because, under high torque conditions, when the sun gear 1 drives the planet gear 2 to rotate, the inclined plane will exert an axial force on the planet gear 2, making it prone to axial movement and causing transmission failure. Traditional methods of reinforcing the rotation position of the planet gear 2 still result in a high failure rate under long-term, high-torque use. Furthermore, spur gear planetary transmission systems not only have limited load-bearing capacity, but also lack the mutual restraint of inclined planes between the spur gears, making... Spur gears are more prone to generating axial force during transmission, which can cause planetary gear 2 to shift axially, affecting normal gear meshing. This axial force can worsen the meshing between sun gear 1 and planetary gear 2, increasing vibration and noise, and may even damage the gears. Therefore, by designing the tooth surface of sun gear 1 to be concave and the radial position of the middle part of planetary gear 2 to protrude outward, the load-bearing capacity can be improved, and axial movement of planetary gear 2 can be avoided. In high torque transmission, when sun gear 1 drives planetary gear 2 to rotate, planetary gear 2 will be subjected to a squeezing force towards its center, which can effectively prevent axial displacement of planetary gear 2, improve service life, and ensure stable operation.

[0033] In an optional embodiment, the width of the driving gear 31 can cover the outer side of the sun gear 1, which can increase the width of the driving gear 31 and the driven gear 4, improve the maximum load-bearing capacity, and make reasonable use of space to avoid wasting space. Adding a rotational sealing structure between the sun gear 1 and the driving gear 31 can not only enhance the rotational stability performance, but also prevent dust from entering and prevent internal lubricating oil from leaking out.

[0034] In an optional embodiment, a coaxial sleeve 8 is fixedly connected to the central position of the gear carrier 3, and an inner shaft 9 is fixedly connected to the axis of the sun gear 1 facing the gear carrier 3. The inner shaft 9 is rotatably connected to the coaxial sleeve 8.

[0035] In this embodiment, in order to further improve the rotational stability between the two sun gears 1 and the driving gear 31, an inner shaft 9 is provided on the sun gear 1, and the inner shaft 9 is inserted into the coaxial sleeve 8. The coaxial sleeve 8 and the inner shaft 9 can be rotatably connected by bearings, thereby improving the rotational stability between the sun gear 1, the planetary gear 2 and the driving gear 31.

[0036] In an optional embodiment, it further includes a housing 12 as a control device, with a mating sleeve 11 fixedly connected to the inner side of the housing 12, and a boss 10 fixedly connected to the axis on the side of the sun gear 1 away from the gear carrier 3, and the mating sleeve 11 and the boss 10 are rotatably connected.

[0037] In this embodiment, the boss 10 and the mating sleeve 11 can be rotatably connected by a bearing, which can make the sun gear 1 rotate stably relative to the outer shell 12. The input shaft A6, input shaft B7 and output shaft 5 are all rotatably connected to the outer shell 12 and are subjected to rotational sealing treatment.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A control device for a gas-fired steam combined cycle unit, characterized in that: It includes two sun gears (1) that are respectively connected to the power output ends of a steam turbine and a gas turbine. The tooth surfaces of the two sun gears (1) are arranged opposite each other. The two sun gears (1) are meshed with several planetary gears (2). The planetary gears (2) are rotatably connected to the gear carrier (3) through the gear shaft. The outer side of the gear carrier (3) is fixedly connected to the driving gear (31). The driving gear (31) is meshed with the driven gear (4). The shaft of the driven gear (4) is fixedly connected to the output shaft (5) for driving the generator. The steam turbine and gas turbine drive the two sun gears (1) to rotate in the same direction.

2. The control device for a combined cycle gas turbine unit according to claim 1, characterized in that: Both the driving gear (31) and the driven gear (4) have herringbone teeth.

3. The control device for a combined cycle gas turbine unit according to claim 1 or 2, characterized in that: The tooth surface of the sun gear (1) is recessed, and the radial position of the middle part of the planetary gear (2) protrudes outward.

4. The control device for a combined cycle gas turbine unit according to claim 1, characterized in that: The width of the drive gear (31) is sufficient to cover the outer side of the sun gear (1).

5. The control device for a combined cycle gas turbine unit according to claim 1, characterized in that: A coaxial sleeve (8) is fixedly connected at the center of the gear carrier (3), and an inner shaft (9) is fixedly connected at the center of the sun gear (1) facing the gear carrier (3). The inner shaft (9) is rotatably connected to the coaxial sleeve (8).

6. The control device for a combined cycle gas turbine unit according to claim 1, characterized in that: It also includes a housing (12) as a control device, with a mating sleeve (11) fixedly connected to the inner side of the housing (12), and a boss (10) fixedly connected to the center of the sun gear (1) on the side away from the gear carrier (3), and the mating sleeve (11) and the boss (10) are rotatably connected.

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