High-speed gear box for power generation of super-power steam turbine

Abstract

The utility model relates to the technical field of steam turbine power generation equipment, in particular to a high-speed gear box for power generation of a super-power steam turbine, which comprises a lower box body, an upper box cover is arranged on the lower box body, an input shaft and an output gear shaft are arranged in the lower box body, a large gear is arranged on the input shaft, and a small gear is arranged on the output gear shaft. High-temperature-resistant sliding bearings are arranged on shaft necks at the two ends of the input shaft and the output gear shaft, oil seals with labyrinth structures are arranged at the shaft extension ends of the input shaft and the output gear shaft, box body oil return cavities are formed in the outer ends of the two sides of the lower box body, a plurality of bearing seats are arranged on the two sides of the lower box body, oil supply hole paths are formed in the bearing seats, and oil supply holes are formed in the oil supply hole paths. Compared with the prior art, the gear box has the advantages that the transmission power is super large, the rotating speed is high, the structure is compact, the size is small, the cost is reduced, the gear box can work forwards and backwards under the condition that the upper box cover is not opened and a large-mass gear transmission part is not removed on the application site, high temperature resistance is achieved, sealing is reliable, and oil leakage does not occur.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine power generation equipment technology, and more specifically, to a high-speed gearbox for ultra-high power steam turbine power generation. Background Technology

[0002] A high-speed gearbox for a steam turbine generator is a mechanical transmission device whose core functions are power transmission, speed reduction, direction change, and torque balancing. The high-speed gearbox transmits power from the steam turbine to the generator, ensuring the unit reaches its rated power. Simultaneously, it reduces speed to match the rotational speed and load, preventing excessive load; it changes direction through mechanical design, increasing operational flexibility; and it balances torque for smoother operation. Furthermore, the gearbox design must possess sufficient rigidity to withstand forces and torques, preventing deformation. The performance of the gearbox is crucial to the normal operation of the steam turbine.

[0003] For example, Chinese Patent Publication: A high-speed gearbox, application number: CN201820702580.2, includes a gearbox housing and a gearbox body. The gearbox housing includes a sleeve and a gearbox chassis. An annular stop block is provided inside the gearbox body, and a gear ring is provided on the upper surface of the annular stop block. The gearbox chassis is fitted to the gear ring. A sub-driver is provided inside the gearbox housing, and an output bearing is sleeved on the sub-driver. A toothed clutch is provided inside the sub-driver. A button is sleeved on the top of the clutch body, and the outer edge of the button mates with the inner edge of the sub-driver. A sub-driver washer and a brake pad are arranged sequentially between the clutch chassis and the sub-driver, and the brake pad is fixedly connected to the inner side of the sub-driver. The positive advantages of this utility model are: the input shaft, output shaft, and gear ring are coaxially arranged, the bearings supporting them are subjected to relatively uniform force, and the structure is safe and stable; the opening and closing control of the rotating structure is achieved through the principle of spring compression and reset, resulting in a compact structure, low manufacturing cost, and convenient maintenance.

[0004] However, the above-mentioned technical solutions place extremely high demands on the sealing performance of the gearbox and the vibration of the gearbox and drive shaft in the high-speed gearbox used in steam turbine generators. Conventional engineering designs use single helical gears or herringbone gears for the internal transmission of the gearbox, with a transmission power not exceeding 20 MW. The sliding bearings use Babbitt alloy and the operating temperature does not exceed 95℃. When the internal sliding bearings are under heavy load, the gearbox can only rotate in one direction. If it is necessary to change the rotation direction, the upper cover of the gearbox must be opened on site, the load-bearing drive shaft and gears and other transmission components must be lifted, and the sliding bearing pads must be rotated to the corresponding load direction. Changing the rotation direction of the gearbox is a complicated task that requires a lot of time and cost. Utility Model Content

[0005] The main objective of this invention is to provide a high-speed gearbox for ultra-high-power steam turbine generators. This effectively solves the problems in the background art where high-speed gearboxes for steam turbine generators have extremely high requirements for housing sealing performance and vibration of the housing and drive shaft. Conventional engineering designs use single helical gears or herringbone gears for the internal transmission of the gearbox, with a transmission power not exceeding 20 MW. The sliding bearings are made of Babbitt alloy, and the operating temperature does not exceed 95℃. When the internal sliding bearings are under heavy load, the gearbox can only rotate in one direction. If it is necessary to change the working rotation direction, the upper cover of the gearbox must be opened on site, the load-bearing drive shaft and gears and other transmission components must be lifted, and the sliding bearing pads must be rotated to the corresponding load direction. Changing the working rotation direction of the gearbox is a complicated task that requires a lot of time and cost.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A high-speed gearbox for ultra-high-power steam turbine generators includes a lower housing with an upper cover. An input shaft and an output gear shaft are housed within the lower housing. A large gear is mounted on the input shaft. High-temperature resistant sliding bearings are installed on the journals at both ends of the input and output gear shafts. Oil seals with labyrinth structures are installed at the shaft extensions of the input and output gear shafts. Oil return chambers are located at the outer ends of both sides of the lower housing. Several bearing seats are located on both sides of the lower housing, and oil supply holes are provided on the bearing seats.

[0008] Preferably, the output gear shaft and the large gear mesh with each other.

[0009] Preferably, the large gear is mounted on the input shaft.

[0010] Preferably, the oil supply passage includes an oil supply passage body, the oil supply passage body is provided with a groove, and two sealing rings are provided in the groove.

[0011] Preferably, a filter screen is provided between the two sealing rings.

[0012] Preferably, the sealing ring and the filter screen are fixedly installed on the inner wall of the groove.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) When this utility model is used, the gearbox meshes with the output gear shaft through the herringbone gear to transmit ultra-high power. The herringbone gear transmission saves the internal space of the gearbox. The oil supply hole directly supplies oil to the sliding bearing, thereby saving the internal space of the gearbox occupied by the oil pipe oil supply. The gearbox has ultra-high power transmission and high speed. It has a compact structure and small size, which reduces the cost. In the application site, the gearbox can achieve forward and reverse operation without opening the upper cover and removing the heavy gear transmission components. The sliding bearing is resistant to high temperature and can still operate reliably under ultra-high power load. The oil supply hole and oil return structure inside the gearbox are specially optimized to make the gearbox reliably sealed and prevent oil leakage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a high-speed gearbox for ultra-high power steam turbine generator according to the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of a high-speed gearbox for ultra-high power steam turbine generator according to the present invention;

[0017] Figure 3 This is a schematic diagram of the oil supply port circuit in a high-speed gearbox for ultra-high power steam turbine generator according to the present invention.

[0018] In the diagram: 1. Input shaft; 2. Output gear shaft; 3. Large gear; 4. Sliding bearing; 5. Oil seal; 6. Oil supply port; 601. Main body of oil supply port; 602. Groove; 603. Sealing ring; 604. Filter screen; 7. Oil return chamber of the housing; 8. Upper housing cover; 9. Lower housing; 10. Bearing seat. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] like Figure 1 and Figure 2As shown, a high-speed gearbox for ultra-high power steam turbine generators includes a lower housing 9, an upper housing cover 8 on the lower housing 9, an input shaft 1 and an output gear shaft 2 inside the lower housing 9, a large gear 3 on the input shaft 1, high-temperature resistant sliding bearings 4 on the journals at both ends of the input shaft 1 and the output gear shaft 2, and oil seals 5 with labyrinth structures on the shaft extension ends of the input shaft 1 and the output gear shaft 2. Oil return chambers 7 are provided on the outer ends of both sides of the lower housing 9, and several bearing seats 10 are provided on both sides of the lower housing 9, with oil supply holes 6 on the bearing seats 10.

[0021] like Figure 3 As shown, in another embodiment of the present invention, the oil supply passage 6 includes an oil supply passage body 601, the oil supply passage body 601 is provided with a groove 602, and two sealing rings 603 are provided in the groove 602;

[0022] A filter screen 604 is provided between the two sealing rings 603;

[0023] When oil needs to be supplied to the sliding bearing 4 through the oil supply hole 6, the oil is filtered by the filter screen 604 to prevent impurities in the oil from damaging the sliding bearing 4. At the same time, the sealing ring 603 prevents oil from entering the groove 602 and prevents oil from accumulating in the groove 602.

[0024] The working principle of a high-speed gearbox for ultra-high-power steam turbine generators:

[0025] In operation, the gearbox meshes with the herringbone gear 3 and the output gear shaft 2 to transmit ultra-high power. The herringbone gear transmission saves internal space. Power is input from the conical shaft end of the input shaft 1, and after the speed is increased by the meshing of the large gear 3 and the output gear shaft 2, it is transmitted from the flange end of the output gear shaft 2. The large gear 3 is mounted on the input shaft 1. The journals at both ends of the input shaft 1 and the output gear shaft 2 are supported by high-temperature resistant sliding bearings 4. At the shaft extension ends of the input shaft 1 and the output gear shaft 2, there are oil seals 5 with a labyrinth structure. Internal oil return chambers 7 are designed on both outer ends of the gearbox. Bearing seats on both sides of the gearbox are equipped with… The gearbox is equipped with an oil supply port 6, through which oil is directly supplied to the sliding bearing 4, thus saving the internal space occupied by oil pipe supply. This gearbox has the characteristics of high power transmission, high speed, compact structure, small size, and reduced cost. In the application field, the gearbox can achieve forward and reverse operation without opening the upper cover 8 and removing heavy gear transmission components. The sliding bearing 4 is resistant to high temperature and can still operate reliably under ultra-high power load. The oil supply port and oil return structure inside the gearbox are specially optimized to ensure reliable sealing and prevent oil leakage.

[0026] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A high-speed gearbox for ultra-high power steam turbine generators, comprising a lower housing (9), characterized in that: The lower housing (9) is provided with an upper housing cover (8). The lower housing (9) is provided with an input shaft (1) and an output gear shaft (2). The input shaft (1) is provided with a large gear (3). The journals at both ends of the input shaft (1) and the output gear shaft (2) are provided with high-temperature resistant sliding bearings (4). The shaft extension ends of the input shaft (1) and the output gear shaft (2) are provided with oil seals (5) with labyrinth structures. The outer ends of both sides of the lower housing (9) are provided with housing oil return chambers (7). Several bearing seats (10) are provided on both sides of the lower housing (9). The bearing seats (10) are provided with oil supply holes (6).

2. The high-speed gearbox for ultra-high power steam turbine generator as described in claim 1, characterized in that: The output gear shaft (2) and the large gear (3) mesh with each other.

3. A high-speed gearbox for ultra-high power steam turbine generator as described in claim 2, characterized in that: The large gear (3) is mounted on the input shaft (1).

4. The high-speed gearbox for ultra-high power steam turbine generator according to claim 3, characterized in that: The oil supply passage (6) includes an oil supply passage body (601), and a groove (602) is provided on the oil supply passage body (601). Two sealing rings (603) are provided in the groove (602).

5. A high-speed gearbox for ultra-high power steam turbine generators according to claim 4, characterized in that: A filter screen (604) is provided between the two sealing rings (603).

6. A high-speed gearbox for ultra-high power steam turbine generator as described in claim 5, characterized in that: The sealing ring (603) and the filter screen (604) are fixedly installed on the inner wall of the groove (602).

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