Impact type hydraulic generator shaft system structure with end air return function

Abstract

The invention relates to the field of impact type hydraulic generators, and discloses an impact type hydraulic generator shaft system structure with an end air return function, which consists of a top shaft, a rotor bracket center body, a main shaft, a sliding rotor, a shaft system end air return device, a collecting ring and a collecting ring end active air seal. The shaft system connection mode of the impact type hydraulic generator rotor is adjusted, the adverse effect of unbalanced eccentric rotation of the end part caused by the mode of connecting the slip rotor with the collector ring bracket on the slip rotor on the circle run-out of the slip rotor is eliminated, and the operation stability of the unit is improved; an active wind source is additionally arranged below an upper cover plate at the shafting end of the impact type hydraulic generator, dead zone air is stirred, accumulated heat is accelerated to be gathered into a main wind path, and meanwhile the shafting end airtight sealing effect is achieved; the shafting structure can realize the arrangement of large-size radiation fan blades with a better air return effect, and is beneficial to the air return effect of the end part of the unit; an active wind source is added to the end of the current collection device, the wind direction is directionally controlled, and active air-tight sealing of the end of the current collection device is achieved.

Description

Technical Field

[0001] The invention relates to the field of impulse turbine generators, and in particular to an impulse turbine generator shaft system structure with an end air return function. Background Art

[0002] my country's impulse turbine generator sets are moving towards large capacity, high speed, high altitude operating environment, and high head hydrological conditions; the Qinghai-Tibet Plateau, the third step of my country's geographical unit, is generally above 4,000 meters above sea level. There is still huge potential for hydropower development in the western Sichuan, Yunnan, Guizhou and other deep areas. The transmission of electricity from Tibet and the transmission of electricity from west to east will help the hydropower development and construction work in the region. The shaft system of the hydropower generator set bears all the axial loads of the generator rotor and transmits the huge torque generated by the high-speed rotation of the impulse turbine under the impact of the water flow. It is an important system to maintain the safe and stable operation of the hydropower generator set. According to the feedback from the operation of conventional vertical giant hydropower generator sets, there are problems of heat accumulation and overflow at the end of the unit shaft system; the traditional air cooling passage has dead zones and blind spots, which will cause heat accumulation and uneven heat distribution in the unit, resulting in damage to the unit's stable operation and operating environment. How to combine the parameter characteristics and operating environment requirements of large impulse turbine generator sets to design a shaft system structure with stable structure and air cooling circulation effect is a huge challenge for the entire project. Therefore, there is an urgent need for a shaft system structure that can meet the requirements of stable operation of the turbine unit, optimize the air circulation path, and improve the air cooling effect. Summary of the invention

[0003] In view of this, the present invention urgently needs to disclose an impulse turbine generator shaft system structure with an end return air function. The technical solution of the present invention is specifically described as follows: The present invention is composed of a top shaft, a rotor support center body, a main shaft, a sliding rotor, a shaft system end return air device, a collector ring, and an active air seal at the end of the collector ring. The top shaft is flange-connected to the rotor support center body and fixed by a first coupling bolt and a first coupling nut; the rotor support center body and the main shaft are fixed by a second coupling bolt, a second coupling nut, and a positioning sleeve; the sliding rotor is fixed to the top shaft by a thermal sleeve; the shaft system end return air device is fixed to the top shaft; the collector ring is fixed to the shaft system end return air device; and the collector ring end active air seal is installed on the upper end of the collector ring. The top shaft, the rotor support center body, the main shaft, the sliding rotor, the shaft system end return air device, and the collector ring are sequentially connected to each other to form a stable shaft system structure.

[0004] In the above-mentioned impulse turbine generator shaft system structure with end return air function, the top shaft is composed of an upper shaft head, a lower shaft flange, and a top shaft body. The upper shaft head is processed with a stopper and then a first screw hole is processed to achieve the limit stop and fixation of the end return air device of the shaft system; the lower shaft flange is processed with a first boss and then a first through hole is processed to achieve the limit stop and fixation of the central body of the rotor bracket.

[0005] In the above-mentioned impulse turbine generator shaft system structure with end return air function, the rotor support center body is composed of an upper disc, a lower disc, a center barrel, and side ribs welded together. The upper disc is processed with a second through hole; the lower disc is processed with a second boss and a third through hole to achieve the limit stop and fixation of the main shaft.

[0006] In the above-mentioned impulse turbine generator shaft system structure with end return air function, the main shaft is composed of a main shaft head, a main shaft lower end shaft flange, and a main shaft body. The main shaft head is processed with a countersunk positioning screw hole; the main shaft lower end shaft flange is processed with a third boss and a fourth through hole to achieve limit stop and fixation with the impulse turbine main shaft. The main shaft body is processed with an integrated lower guide rotor to improve the integrity of the main shaft body.

[0007] In the above-mentioned impulse turbine generator shaft system structure with end return air function, the shaft system end return air device is composed of an upper ring, a lower ring, a cylindrical wall, and radial blades. The upper ring is processed with a fifth through hole, and the lower ring is processed with a sixth through hole. The shaft system end return air device serves as the second active wind source in addition to the rotor bracket and the outer ring assembly. It utilizes the speed characteristics of the impulse turbine unit to stir the dead zone air below the upper cover plate within the projected area of ​​the unit top cover, and accelerates the accumulation of heat into the main wind path; at the same time, the high-speed wind pressure generated also plays a role in the air sealing effect of the shaft system end.

[0008] In the above-mentioned impulse turbine generator shaft system structure with end air return function, the upper ring surface of the collector ring is processed with a second screw hole for fixing the right-angle fan blades.

[0009] In the above-mentioned impulse turbine generator shaft system structure with end return air function, the active air seal at the end of the collector ring is composed of fixed right-angle fan blades and annular insulating air guide rings. The fixed right-angle fan blades are fixed on the upper ring surface of the collector ring to form a third active wind source. The annular insulating air guide ring is nested and installed in the processed collector ring structure to guide the wind direction and directionally control the wind direction to achieve active air sealing at the end of the collector device.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The present invention adjusts the connection mode of the rotor shaft system of the impulse turbine generator, and the return air device at the end of the shaft system is directly fixedly matched with the top shaft, eliminating the sliding rotor as an intermediate medium, and the sliding rotor is only fixed on the upper end of the top shaft by shrink sleeve, and is lubricated with the upper frame bearing; the adverse effect of the unbalanced eccentric rotation of the end caused by the connection mode of the collector ring bracket on the sliding rotor on the circular runout of the sliding rotor is eliminated, and the operation stability of the unit is improved.

[0012] 2. The present invention adds an active wind source below the upper cover plate at the end of the impulse turbine generator shaft system, utilizes the speed characteristics of the impulse turbine unit, stirs the dead zone air within the projected area of ​​the unit top cover and below the upper cover plate, and accelerates the accumulation of heat into the main wind path; at the same time, the high-speed wind pressure generated also plays an air-sealing effect on the end of the shaft system.

[0013] 3. The inner diameter of the lower ring plate of the return air device at the end of the shaft system of the present invention is retracted, which can realize the arrangement of large-sized radiant fan blades with better return air effect, which is beneficial to the return air effect at the end of the unit.

[0014] 4. The present invention adds an active wind source to the end of the collector device of the impulse turbine generator shaft system to guide the wind direction and directionally control the wind direction to achieve active air sealing at the end of the collector device. The heat and dust generated by the friction between the collector device and the carbon brush are limited by the two active air seals and can be directionally sucked into the carbon powder dust removal device.

[0015] 5. The present invention is applicable to large and giant hydro-turbine generator sets of different structures and sizes, and has wide engineering application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a brief introduction to the drawings required for the embodiments:

[0017] Figure 1 It is a schematic diagram of the air cooling wind path of the impulse turbine generator set with end return air function;

[0018] Figure 2 This is a detailed diagram of the shafting structure of an impulse turbine generator with end return air function;

[0019] Figure 3 This is the top shaft structure detail;

[0020] Figure 4 This is a detailed structural diagram of the rotor support center body;

[0021] Figure 5 Detailed drawing of the main shaft structure;

[0022] Figure 6 This is the structural detail of the return air device at the end of the shaft system;

[0023] Figure 7 Detailed drawing of the active air seal structure between the collector ring and the collector ring end.

[0024] Description of the component numbers in the figure:

[0025] 1-top shaft; 2-rotor bracket center body; 3-main shaft; 4-sliding rotor; 5-return air device at the end of the shaft system; 6-collector ring; 7-active air seal at the end of the collector ring; 8-first coupling bolt; 9-first coupling nut; 10-second coupling bolt; 11-second coupling nut; 12-positioning sleeve; 13-upper end shaft head; 14-lower end shaft flange; 15-top shaft body; 16-stop; 17-first screw hole; 18-first boss; 19-first through hole; 20-upper disc; 21-lower disc; 22 -center barrel; 23-side ribs; 24-second through hole; 25-second boss; 26-third through hole; 27-spindle head; 28-spindle lower end flange; 29-spindle body; 30-countersunk positioning screw hole; 31-third boss; 32-fourth through hole; 33-integrated lower guide rotor; 34-upper ring; 35-lower ring; 36-cylinder wall; 37-radial blades; 38-fifth through hole; 39-sixth through hole; 40-second screw hole; 41-fixed right-angle blades; 42-annular insulating air guide ring. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] like Figure 2 As shown, a shaft system structure of an impact turbine generator with an end return air function is composed of a top shaft 1, a rotor support center body 2, a main shaft 3, a sliding rotor 4, a shaft system end return air device 5, a collector ring 6, and a collector ring end active air seal 7. The top shaft 1 is flange-connected with the rotor support center body 2 through the first coupling bolt 8, and the first coupling nut 9 is fixed together; the rotor support center body 2 and the main shaft 3 are fixed together through the second coupling bolt 10, the second coupling nut 11, and the positioning sleeve 12; the sliding rotor 4 is fixed with the top shaft 1 by shrink sleeve; the shaft system end return air device 5 is fixed together with the top shaft 1; the collector ring 6 is fixed together with the shaft system end return air device 5; and the collector ring end active air seal 7 is installed on the upper end of the collector ring 6. The top shaft 1, the rotor support center body 2, the main shaft 3, the sliding rotor 4, the shaft system end return air device 5, and the collector ring 6 are sequentially connected to each other to form a stable shaft system structure.

[0028] like Figure 3As shown, the top shaft is composed of an upper shaft head 13, a lower shaft flange 14, and a top shaft body 15. The upper shaft head 13 is processed with a stopper 16 and then a first screw hole 17 to achieve the limit stop and fixation of the return air device 5 at the end of the shaft system; the lower shaft flange 14 is processed with a first boss 18 and then a first through hole 19 to achieve the limit stop and fixation of the rotor bracket center body 2.

[0029] like Figure 4 As shown, the rotor support center body 2 is welded by an upper disc 20, a lower disc 21, a center barrel 22, and side ribs 23. The upper disc 20 is processed with a second through hole 24; the lower disc 21 is processed with a second boss 25 and a third through hole 26 to achieve the limit stop and fixation of the main shaft 3.

[0030] like Figure 5 As shown, the main shaft 3 is composed of a main shaft head 27, a main shaft lower end flange 28, and a main shaft body 29. The main shaft head 27 is processed with a countersunk positioning screw hole 30; the main shaft lower end flange 28 is processed with a third boss 31 and a fourth through hole 32 to achieve position stop and fixation with the impulse turbine main shaft 3. The main shaft body 29 is processed with an integrated lower guide rotor 33 to improve the integrity of the main shaft body 29.

[0031] like Figure 6 As shown, the shaft end return air device 5 is composed of an upper ring 34, a lower ring 35, a cylindrical wall 36, and radial blades 37. The upper ring 34 is processed with a fifth through hole 38, and the lower ring 35 is processed with a sixth through hole 39. The shaft end return air device 5 is used as the second active wind source in addition to the rotor bracket and the outer ring assembly. It uses the speed characteristics of the impulse turbine unit to stir the dead zone air below the upper cover plate within the projected area of ​​the unit top cover, accelerate the accumulation of heat into the main wind path; and the high-speed wind pressure generated at the same time also plays a role in the air sealing effect of the shaft end.

[0032] like Figure 7 As shown, the upper ring surface of the collector ring 6 is processed with a second screw hole 40 for fixing the right-angle fan blade 41; the active air seal 7 at the end of the collector ring is composed of a fixed right-angle fan blade 41 and an annular insulating air guide ring 42. The fixed right-angle fan blade 41 is fixed on the upper ring surface of the collector ring 6 to form a third active wind source, and the annular insulating air guide ring 42 is nested and installed in the processed collector ring 6 structure to guide the wind direction and directionally control the wind direction to achieve active air sealing at the end of the collector device.

[0033] The present invention adjusts the rotor shaft connection mode of the impulse turbine generator, eliminates the adverse effect of the unbalanced eccentric rotation at the end caused by the connection mode of the collector ring bracket on the sliding rotor on the circular runout of the sliding rotor, and improves the operating stability of the unit; an active wind source is added below the upper cover plate at the end of the impulse turbine generator shaft system to stir the dead zone air, accelerate the accumulation of heat into the main wind path, and also play an air-sealing effect at the end of the shaft system; the shaft system structure can realize the arrangement of large-size radiant fan blades with better return air effect, which is beneficial to the return air effect at the end of the unit; an active wind source is added at the end of the collector device to directionally control the wind direction and realize the active air sealing at the end of the collector device; and it is suitable for large and giant hydro-turbine generator sets of different structures and sizes, and has a wide range of engineering applications and promotion value.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 by specific circumstances.

[0035] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A shaft system structure of an impulse turbine generator with end return air function, Features: The invention comprises a top shaft (1), a rotor support center body (2), a main shaft (3), a sliding rotor (4), a shaft system end return air device (5), a collector ring (6), and an active air seal (7) at the end of the collector ring. The top shaft (1) is flange-connected with the rotor support center body (2) and fixed by a first coupling bolt (8) and a first coupling nut (9); the rotor support center body (2) and the main shaft (3) are fixed by a second coupling bolt (10), a second coupling nut (11), and a positioning sleeve (12); the sliding rotor (4) and the top shaft (1) are fixed by heat-shrink sleeve; the shaft system end return air device (5) and the top shaft (1) are fixed; the collector ring (6) and the shaft system end return air device (5) are fixed; the active air seal (7) at the end of the collector ring is installed on the upper end of the collector ring (6); the top shaft (1), the rotor support center body (2), the main shaft (3), the sliding rotor (4), the shaft system end return air device (5), and the collector ring (6) are sequentially connected to each other to form a stable shaft system structure.

2. The shaft system structure of the impulse turbine generator with end return air function according to claim 1, Features: The top shaft (1) is composed of an upper shaft head (13), a lower shaft flange (14), and a top shaft body (15); a stopper (16) is machined on the upper shaft head (13) and then a first screw hole (17); and a first boss (18) is machined on the lower shaft flange (14) and then a first through hole (19).

3. The shaft system structure of the impulse turbine generator with end return air function according to claim 1, Features: The rotor support center body (2) is welded together by an upper disc (20), a lower disc (21), a center barrel (22), and side ribs (23); the upper disc (20) is processed with a second through hole (24); the lower disc (21) is processed with a second boss (25) and a third through hole (26).

4. The shaft system structure of the impulse turbine generator with end return air function according to claim 1, Features: The spindle (3) is composed of a spindle head (27), a spindle lower end flange (28), and a spindle body (29); the spindle head (27) is processed with a countersunk positioning screw hole (30); the spindle lower end flange (28) is processed with a third boss (31) and a fourth through hole (32); and the spindle body (29) is processed with an integrated lower guide rotor (33).

5. The shaft system structure of the impulse turbine generator with end return air function according to claim 1, Features: The shaft end air return device (5) is composed of an upper ring (34), a lower ring (35), a cylindrical wall (36), and radial blades (37). The upper ring (34) is processed with a fifth through hole (38), and the lower ring (35) is processed with a sixth through hole (39).

6. The shaft system structure of the impulse turbine generator with end return air function according to claim 1, Features: A second screw hole (40) is processed on the upper ring surface of the collector ring (6).

7. The shaft system structure of the impulse turbine generator with end return air function according to claim 1, Features: The active air seal (7) at the end of the collector ring is composed of fixed right-angle blades (41) and an annular insulating air guide ring (42); the fixed right-angle blades (41) are installed on the upper ring surface of the collector ring (6); and the annular insulating air guide ring (42) is nested and installed in the collector ring (6) structure.

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