Generator main shaft with internal circulation type cooling structure

Abstract

The utility model relates to the field of generator main shafts, in particular to a generator main shaft with an internal circulation type cooling structure, which comprises a generator main shaft outer shell, an assembly for assembling a generator and a rear end shaft body cooling water channel arranged in the generator main shaft outer shell and used for performing internal circulation cooling on the generator main shaft. Due to the arrangement of the generator main shaft outer shell, the rear end shaft body cooling water channel, the outer cooling shaft sleeve, the inclined side water outlet, the water channel sealing plate and the sealing plate water inlet and outlet pipe, when the generator main shaft is overheated, cooling liquid can be injected from the water inlet and outlet above the outer cooling shaft sleeve, and the generator main shaft rotates in the generator main shaft outer shell along with the generator main shaft; cooling liquid flows into the front-end shaft body cooling water channel from the circulating water channel, then enters the rear-end shaft body cooling water channel and then wraps the thin wall outside the whole generator spindle, and therefore the cooling liquid can penetrate through the thin wall to conduct internal circulating cooling work on the generator spindle.

Description

Technical Field

[0001] The utility model relates to the field of generator main shafts, in particular to a generator main shaft with an internal circulation cooling structure. Background Art

[0002] The main shaft of the generator is one of the important parts connecting the rotor and the bearing. Its main function is to transfer mechanical energy to the rotor. It also plays the role of fixing and supporting the rotor. The main shaft of the generator is usually divided into two types: direct shaft and rotating shaft. The direct shaft is mainly suitable for generators with lower power. It is characterized by simple processing and compact structure. The rotating shaft is mainly suitable for large and high-power generators. Its characteristic is that the rotor and the main shaft can be separated, which is convenient for maintenance and overhaul. The main shaft of the generator is widely used in generators of various models and powers, including steam turbine generators, wind turbine generators, hydroelectric generators, thermal generators, etc. Among them, wind turbine generators and hydroelectric generators usually use large and high-power rotating shaft main shafts.

[0003] After searching, a generator main shaft structure with publication number CN209896841U is found, which specifically discloses a generator main shaft structure, including a transmission shaft, a rotor shaft, a movable shaft, and a connecting shaft. One end of the transmission shaft is rotatably connected to one end of the rotor shaft, and the other end of the transmission shaft is rotatably connected to the prime mover. An axial through hole is provided at the center of the rotor shaft, and the connecting shaft is provided in the axial through hole. The left end of the connecting shaft is connected to the movable shaft, and the movable shaft is fixedly installed on the transmission shaft, and the right end of the connecting shaft is connected to the other end of the rotor shaft. The utility model has the advantages of small size, simple and compact structure, stable operation, high reliability, convenient and quick installation, can eliminate the coaxiality error of the transmission shaft, rotor shaft and connecting shaft during installation, reduce the vibration of the generator during operation, and can adjust the axial distance between the spline shaft and the rotor shaft.

[0004] During use of the existing generator main shaft, due to the high-speed operation of the generator main shaft, power loss is generated internally, causing the motor to heat up. However, the generator main shaft is installed in the main shaft unit housing, so the generator main shaft cannot directly use a fan to dissipate heat, and the natural heat dissipation conditions are also relatively poor. In addition, the generator main shaft in the above-mentioned comparative case also lacks an internal circulation cooling structure. Therefore, the generator installed in conjunction with the generator main shaft lacking an internal circulation cooling structure needs to be used on and off during long-term use to reduce overheating of the generator main shaft through natural heat dissipation, which not only delays the overall use efficiency of the generator, but also continuous overheating will cause certain losses to the generator main shaft.

[0005] Therefore, it is necessary to invent a generator main shaft with an internal circulation cooling structure to solve the above problems. Utility Model Content

[0006] The utility model aims to provide a generator main shaft with an internal circulation cooling structure, which realizes internal circulation cooling and temperature reduction work of the generator main shaft through the generator main shaft outer shell, the rear end shaft cooling water channel, the external cooling shaft sleeve, the oblique side water outlet, the water channel sealing plate and the sealing plate inlet and outlet water pipes. At the same time, when the temperature of the cooling water for cooling the outside of the generator main shaft is not enough, the sealing plate inlet and outlet pipes of the water channel sealing plate can be opened to use an external water pump and other water injection devices, while injecting new coolant from the water inlet and outlet, and extracting the coolant with increased temperature from the sealing plate inlet and outlet pipes, thereby completing the circulation cooling work of the coolant on the generator main shaft, which not only realizes the rapid cooling of the generator main shaft, but also ensures the overall use efficiency of the generator. The effect of reducing the loss caused by overheating of the generator main shaft is to solve the problem in the prior art that during the use of the generator main shaft, due to the high-speed operation of the generator main shaft, the internal power loss causes the motor to heat up. However, the generator main shaft is installed in the main shaft unit housing, so the generator main shaft cannot directly adopt fan heat dissipation, and the natural heat dissipation conditions are also relatively poor. In the above-mentioned comparative case, the generator main shaft also lacks an internal circulation cooling structure. In this way, the generator installed in combination with the generator main shaft lacking the internal circulation cooling structure needs to be stopped and started for a long time to reduce the overheating of the generator main shaft through natural heat dissipation, which not only delays the overall use efficiency of the generator, but also continuous overheating will cause certain losses to the generator main shaft.

[0007] In order to achieve the above-mentioned object, the utility model provides the following technical solutions: a generator main shaft with an internal circulation cooling structure, comprising a generator main shaft outer shell, used for assembling components of the generator;

[0008] The rear end shaft cooling water channel is arranged inside the outer shell of the generator main shaft, and is used for internal circulation cooling of the generator main shaft, and a circulation water port is arranged on one side of the rear end shaft cooling water channel, and a front end shaft cooling water channel is arranged on the other side of the circulation water port;

[0009] An outer cooling sleeve is arranged on the outside of the generator main shaft outer shell and is used for injecting internal circulating cooling water. A circulating water channel is opened inside the outer cooling sleeve. A water inlet and outlet are arranged on the top of the outer cooling sleeve. An oblique side water outlet is opened on one side of the generator main shaft outer shell. A fastening bolt passes through one side of the generator main shaft outer shell, and one end of the fastening bolt is movably connected to a water channel sealing plate. The water channel sealing plate is fixedly installed with a sealing plate inlet and outlet water pipes on the outside.

[0010] Preferably, an inner shaft mounting groove is provided inside the generator main shaft outer shell, a generator main shaft body is provided inside the inner shaft mounting groove, and a linkage shaft rod is fixedly installed inside the generator main shaft body.

[0011] Preferably, an outer bearing seat is provided inside the outer shell of the generator main shaft, and a ceramic ball bearing is fixedly installed inside the outer bearing seat.

[0012] Preferably, a bearing abutment sleeve is provided on one side of the ceramic ball bearing, a fixing bolt penetrates the outside of the bearing abutment sleeve, and one end of the fixing bolt is movably connected to a terminal nut.

[0013] Preferably, the outer cooling sleeve is fixedly connected to the outer shaft casing of the generator, and the water inlet and outlet are symmetrically arranged about the center axis of the outer cooling sleeve.

[0014] Preferably, the water channel sealing plate is threadedly connected to the outer casing of the generator main shaft, and the water inlet and outlet pipes of the sealing plate are distributed at equal intervals on the water channel sealing plate.

[0015] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0016] The utility model is provided with a generator main shaft outer shell, a rear end shaft cooling water channel, an outer cooling sleeve, an oblique side water outlet, a water channel sealing plate and a sealing plate inlet and outlet water pipe. When the generator main shaft is overheated, coolant can be injected from the water inlet and outlet above the outer cooling sleeve. As the generator main shaft rotates inside the generator main shaft outer shell, the coolant flows from the circulating water channel into the front end shaft cooling water channel and then into the rear end shaft cooling water channel and then wraps around the thin wall outside the entire generator main shaft. In this way, the coolant can pass through the thin wall to perform internal circulation cooling and temperature reduction work on the generator main shaft. The water channel sealing plate disposed at one end of the generator main shaft outer shell blocks the front shaft cooling water channel. When the temperature of the cooling water used for cooling the outside of the generator main shaft is not enough, the water inlet and outlet pipes of the water channel sealing plate can be opened to use an external water pump and other water injection devices to inject new coolant from the water inlet and outlet while extracting the coolant with increased temperature from the water inlet and outlet pipes of the sealing plate, thereby completing the circulation cooling of the generator main shaft by the coolant. This not only achieves rapid cooling of the generator main shaft, but also ensures the overall use efficiency of the generator and reduces the loss caused by overheating of the generator main shaft.

[0017] The utility model is provided with a generator main shaft outer shell, an inner shaft mounting groove, a generator main shaft body, a linkage shaft rod, an outer bearing seat, a ceramic ball bearing, a bearing contact sleeve, a fixing bolt and an end nut. When the generator main shaft is installed, the generator main shaft body and the ceramic ball bearing can be quickly assembled through the inner shaft mounting groove and the outer bearing seat. The ceramic ball bearing can ensure the stability of the generator main shaft body and the linkage shaft rod in the operation inside the generator main shaft outer shell. At the same time, after the generator main shaft body is assembled, the end nut can be twisted to make the end nut contact the bearing contact sleeve, thereby pre-tightening the ceramic ball bearing and the front end of the generator main shaft body to ensure the stability of the generator main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of a ceramic ball bearing of the utility model;

[0021] Figure 3 This is a schematic diagram of the end nut structure of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the external cooling sleeve of the utility model;

[0023] Figure 5 It is a schematic diagram of the waterway sealing plate structure of the utility model.

[0024] Description of reference numerals:

[0025] 1. Generator main shaft outer shell; 2. Inner shaft mounting groove; 3. Generator main shaft body; 4. Linkage shaft; 5. Outer bearing seat; 6. Ceramic ball bearing; 7. Bearing contact sleeve; 8. Fixing bolt; 9. End nut; 10. Rear end shaft cooling water channel; 11. Circulating water inlet; 12. Front end shaft cooling water channel; 13. External cooling sleeve; 14. Circulating water channel; 15. Water inlet and outlet; 16. Oblique water outlet; 17. Fastening bolt; 18. Water channel sealing plate; 19. Sealing plate inlet and outlet pipes. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] The utility model provides Figure 1-5 A generator main shaft with an internal circulation cooling structure shown includes a generator main shaft outer shell 1, which is used to assemble components of the generator;

[0028] The rear end shaft cooling water channel 10 is arranged inside the generator main shaft outer shell 1, and is used for internal circulation cooling of the generator main shaft, and a circulation water inlet 11 is arranged on one side of the rear end shaft cooling water channel 10, and a front end shaft cooling water channel 12 is arranged on the other side of the circulation water inlet 11;

[0029] An outer cooling sleeve 13 is arranged on the outside of the generator main shaft outer shell 1 for injecting internal circulating cooling water, and a circulating water channel 14 is opened inside the outer cooling sleeve 13, and an inlet and outlet water port 15 is arranged above the outer cooling sleeve 13. An oblique side outlet 16 is opened on one side of the generator main shaft outer shell 1, and a fastening bolt 17 passes through one side of the generator main shaft outer shell 1, and one end of the fastening bolt 17 is movably connected to a water channel sealing plate 18, and a sealing plate inlet and outlet pipe 19 is fixedly installed on the outside of the water channel sealing plate 18. The water channel sealing plate 18 arranged at one end of the generator main shaft outer shell 1 blocks the front shaft cooling water channel 12. When the temperature of the cooling water for cooling the outside of the generator main shaft is not enough, the sealing plate inlet and outlet pipe 19 of the water channel sealing plate 18 can be opened by using an external water pump and other water injection devices, while injecting new coolant from the inlet and outlet water port 15, and extracting the coolant with increased temperature from the sealing plate inlet and outlet pipe 19, thereby completing the circulating cooling of the generator main shaft by the coolant.

[0030] An inner shaft mounting groove 2 is provided inside the generator main shaft outer shell 1, a generator main shaft body 3 is provided inside the inner shaft mounting groove 2, a linkage shaft rod 4 is fixedly installed inside the generator main shaft body 3, and when the generator main shaft is installed, the generator main shaft body 3 and the ceramic ball bearing 6 can be quickly assembled through the inner shaft mounting groove 2 and the outer bearing seat 5.

[0031] An outer bearing seat 5 is arranged inside the generator main shaft outer shell 1, and a ceramic ball bearing 6 is fixedly installed inside the outer bearing seat 5. The ceramic ball bearing 6 can ensure the stability of the operation of the generator main shaft body 3 and the linkage shaft rod 4 inside the generator main shaft outer shell 1.

[0032] A bearing contact sleeve 7 is provided on one side of the ceramic ball bearing 6, and a fixing bolt 8 passes through the outside of the bearing contact sleeve 7. One end of the fixing bolt 8 is movably connected with an end nut 9. After the generator main shaft body 3 is assembled, the end nut 9 can be twisted to make the end nut 9 contact the bearing contact sleeve 7, thereby pre-tightening the ceramic ball bearing 6 and the front end of the generator main shaft body 3 to ensure the stability of the generator main shaft.

[0033] The outer cooling sleeve 13 is fixedly connected to the outer casing 1 of the generator main shaft, and the water inlet and outlet 15 are symmetrically arranged with respect to the central axis of the outer cooling sleeve 13. The coolant can be injected from the water inlet and outlet 15 above the outer cooling sleeve 13, so that the coolant flows from the circulating water channel 14 into the front shaft cooling water channel 12 and then into the rear shaft cooling water channel 10, and then is wrapped around the thin wall outside the entire generator main shaft, thereby completing the internal circulation cooling work.

[0034] The water channel sealing plate 18 is threadedly connected to the generator main shaft outer shell 1, and the sealing plate inlet and outlet water pipes 19 are evenly spaced on the water channel sealing plate 18. The water channel sealing plate 18 has a simple structure and is easy to operate. When a fault occurs, it is also convenient for maintenance personnel to replace or repair it in time.

[0035] The practical working principle of the present invention is as follows: first, take out the generator main shaft that needs to be assembled with the generator. The generator main shaft body 3 and the ceramic ball bearing 6 can be quickly assembled through the inner shaft mounting groove 2 and the outer bearing seat 5. Then, the ceramic ball bearing 6 installed inside can ensure the stability of the generator main shaft body 3 and the linkage shaft rod 4 when they are running inside the generator main shaft outer shell 1. Then, after the generator main shaft body 3 is assembled, the end nut 9 is twisted to make the end nut 9 contact the bearing contact sleeve 7 to pre-tighten the ceramic ball bearing 6 and the front end of the generator main shaft body 3 to ensure the stability of the generator main shaft. Subsequently, the assembled generator main shaft is assembled with other generator components, and the external power supply is connected to complete the normal use of the entire generator. If the generator main shaft 3 and the linkage shaft rod 4 are overheated as a whole due to long-term rotation of the generator main shaft, coolant can be injected from the water inlet and outlet 15 above the outer cooling sleeve 13. Then, the generator main shaft rotates inside the generator main shaft outer shell 1, and the coolant flows from the circulating water channel 14 into the front shaft body for cooling. The water channel 12 then enters the rear end shaft cooling water channel 10, and then wraps around the thin wall on the outside of the entire generator main shaft, so that the coolant can pass through the thin wall to perform internal circulation cooling and temperature reduction work on the generator main shaft. Subsequently, the water channel sealing plate 18 arranged at one end of the generator main shaft outer shell 1 blocks the front end shaft cooling water channel 12. When the cooling water temperature for cooling the outside of the generator main shaft is not enough, the sealing plate inlet and outlet pipes 19 of the water channel sealing plate 18 can be opened to use an external water pump and other water injection devices. While injecting new coolant from the inlet and outlet 15, the coolant with increased temperature is extracted from the sealing plate inlet and outlet pipes 19, thereby completing the circulation cooling of the generator main shaft by the coolant. In this way, the rapid cooling of the generator main shaft is achieved, and the overall use efficiency of the generator is ensured. Finally, after completing the installation and cooling of all the generator main shafts according to the above operations, turn off the external power supply, and perform daily maintenance on the device. In this way, the use process of the generator main shaft with an internal circulation cooling structure is completed.

[0036] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A generator main shaft with an internal circulation cooling structure, characterized in that: include A generator main shaft housing (1) for assembling components of a generator; A rear end shaft cooling water channel (10) is arranged inside the generator main shaft outer shell (1) and is used for internal circulation cooling of the generator main shaft, and a circulation water inlet (11) is arranged on one side of the rear end shaft cooling water channel (10), and a front end shaft cooling water channel (12) is arranged on the other side of the circulation water inlet (11); An outer cooling sleeve (13) is arranged outside the generator main shaft outer shell (1) and is used for injecting internal circulating cooling water. A circulating water channel (14) is provided inside the outer cooling sleeve (13). A water inlet and outlet (15) is provided above the outer cooling sleeve (13). An oblique side water outlet (16) is provided on one side of the generator main shaft outer shell (1). A fastening bolt (17) penetrates one side of the generator main shaft outer shell (1). One end of the fastening bolt (17) is movably connected to a water channel sealing plate (18). A sealing plate inlet and outlet water pipe (19) is fixedly installed on the outside of the water channel sealing plate (18).

2. The generator main shaft with an internal circulation cooling structure according to claim 1, characterized in that: An inner shaft mounting groove (2) is arranged inside the generator main shaft outer shell (1), a generator main shaft body (3) is arranged inside the inner shaft mounting groove (2), and a linkage shaft rod (4) is fixedly installed inside the generator main shaft body (3).

3. The generator main shaft with an internal circulation cooling structure according to claim 1, characterized in that: An outer bearing seat (5) is arranged inside the generator main shaft outer shell (1), and a ceramic ball bearing (6) is fixedly installed inside the outer bearing seat (5).

4. The generator main shaft with an internal circulation cooling structure according to claim 3, characterized in that: A bearing abutment sleeve (7) is provided on one side of the ceramic ball bearing (6), a fixing bolt (8) penetrates the outside of the bearing abutment sleeve (7), and one end of the fixing bolt (8) is movably connected to a terminal nut (9).

5. The generator main shaft with an internal circulation cooling structure according to claim 1, characterized in that: The outer cooling sleeve (13) is fixedly connected to the generator main shaft outer casing (1), and the water inlet and outlet (15) are symmetrically arranged about the central axis of the outer cooling sleeve (13).

6. The generator main shaft with an internal circulation cooling structure according to claim 1, characterized in that: The water channel sealing plate (18) is threadedly connected to the generator main shaft outer shell (1), and the sealing plate water inlet and outlet pipes (19) are distributed at equal intervals on the water channel sealing plate (18).

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