Cooling structure of water turbine main shaft bearing

Abstract

The cooling structure comprises a main shaft, a first bearing, a second bearing and a rotating ring, the first bearing, the second bearing and the rotating ring surround the outer side face of the main shaft, the upper end face of the first bearing is connected with the lower end face of the second bearing in a clamped mode, and the inner side face of the first bearing is connected with the outer side face of the main shaft in a clamped mode. The rotating ring is arranged above the second bearing and rotationally connected with the outer side face of the main shaft, a plurality of air swinging pieces are arranged on the outer side face of the rotating ring and fixedly connected with the outer side face of the rotating ring, the air swinging pieces are arranged above the second bearing, a plurality of through holes are formed in the main shaft, the section of each through hole is in a C shape, and the two ends of each C shape are distributed up and down. The through holes uniformly surround the outer side surface of the main shaft by taking the main shaft as the center, the through holes in the same plane form a group and are divided into two groups, and the two groups of through holes are in one-to-one correspondence with the positions of the first bearing and the second bearing respectively. The air cooling device has the advantage that the cooling effect of air cooling is improved.

Description

Technical Field

[0001] The utility model relates to the relevant technical field of water turbines, in particular to a cooling structure of a main shaft bearing of a water turbine. Background Art

[0002] Air cooling is the most widely used and common cooling method for hydro-turbine generators, but the cooling effect is not very good. There are many other cooling methods, but the structures are generally much more complicated and maintenance is more troublesome. Utility Model Content

[0003] The utility model aims to overcome the shortcoming of poor cooling effect of air cooling in the prior art and provides a cooling structure for a turbine main shaft bearing which improves the cooling effect of air cooling.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The cam is secured to the outer surface of the main shaft by means of a pin, and the cam is secured to the outer surface of the main shaft by means of a pin.

[0006] When in use, first insert bearing one and bearing two into the main shaft in sequence, and leave a gap between bearing one and bearing two, and leave a gap between the bottom of bearing one and the main shaft. Bearing one and bearing two correspond to the positions of the two groups of through holes respectively. The upper and lower holes of the C-shaped through hole need to leak out a part to facilitate air entry. Then, the rotating ring is clamped into the main shaft and placed above bearing two, so that the rotating ring and the main shaft can rotate smoothly. In this way, the swing blades can be driven when there is air circulation, air circulation can be accelerated, and the ambient temperature of bearing two and bearing one can be reduced, thereby achieving the purpose of improving the cooling effect of air cooling.

[0007] Preferably, an annular groove (1) is provided on the inner side of the first bearing, and a snap ring is provided on the outer side of the spindle. The snap ring is positioned between the two ends of the C-shaped through-hole and is fixedly connected to the outer side of the spindle. The annular groove (1) and the snap ring correspond to each other, and the first bearing is engaged with the spindle through the cooperation of the annular groove (1) and the snap ring. The annular groove (1) and the snap ring facilitate the fixation of the first bearing, and the snap ring positioned between the two ends of the C-shaped through-hole can reduce the internal temperature of the first bearing by allowing air to enter.

[0008] Preferably, the spindle is provided with a bearing support, which surrounds and is fixedly connected to the outer side of the spindle. A plurality of raised bars are provided on the upper end surface of the bearing support, which are evenly distributed on the upper end surface of the bearing support with the spindle as the center. The lower end surfaces of the raised bars are fixedly connected to the upper end surface of the bearing support, and the upper end surfaces of the raised bars contact the lower end surface of the first bearing. The raised bars facilitate air entry into the first bearing, thereby reducing the internal temperature.

[0009] Preferably, the upper end surface of the bearing 1 is provided with a plurality of slots, the cross-sectional shape of the slots being small at the top and large at the bottom, the slots being evenly distributed on the upper end surface of the bearing 1 with the main shaft as the center, the lower end surface of the bearing 2 being provided with a plurality of clamping blocks, the upper end surface of the clamping blocks being fixedly connected to the lower end surface of the bearing 2, the lower end of the clamping blocks being placed in the slots, the clamping blocks corresponding to the slots one-to-one, the height of the clamping blocks being higher than the height of the slots, and the bearing 1 being clamped to the bearing 2 through the cooperation of the slots and the clamping blocks. The slots being small at the top and large at the bottom facilitate the clamping of the clamping blocks, thus facilitating the connection between the bearings 2 and the bearing 2, and the bearing 2 does not need to be too tightly attached to the main shaft, which would cause the internal temperature to be too high.

[0010] Preferably, the rotating ring is provided with a notch, the width of the notch being smaller than the diameter of the main shaft, and the main shaft is passed through the notch and placed in the rotating ring. The notch facilitates the installation of the rotating ring.

[0011] Preferably, a second annular groove is provided on the outer side of the main shaft, the inner side of the rotating ring is placed in the second annular groove, and a plurality of balls are provided on the inner side of the rotating ring. The outer sides of the balls are placed in and rotatably connected to the rotating ring, and the outer sides of the balls are in contact with the inner bottom surface of the second annular groove. The rotating ring is rotatably connected to the main shaft through the cooperation of the balls and the second annular groove. The balls can reduce the contact between the rotating ring and the second annular groove, requiring less force and making the rotation smoother.

[0012] The beneficial effects of the present invention are: the purpose of improving the cooling effect of air cooling; the annular groove 1 and the retaining ring facilitate fixing the bearing 1, and the retaining ring is placed between the two ends of the C-shaped through hole to reduce the internal temperature of the bearing 1 due to the entry of air; the lifting bar facilitates the entry of air into the bearing 1, reducing the internal temperature; the retaining groove is small at the top and large at the bottom, which is convenient for clamping the retaining block, thus facilitating the connection between the bearing 2 and the bearing 2, and the bearing 2 does not need to be too close to the main shaft to cause the internal temperature to be too high; the notch facilitates the installation of the rotating ring; the ball can reduce the contact between the rotating ring and the annular groove 2, requiring less force and smoother rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 It is a cross-sectional view of the main view of the present utility model;

[0015] Figure 3 yes Figure 2 An enlarged view of detail A;

[0016] Figure 4 yes Figure 2 Magnified view of detail B.

[0017] In the figure: 1. Main shaft, 2. Bearing 1, 3. Bearing 2, 4. Rotating ring, 5. Oscillating blade, 6. Through hole, 7. Annular groove 1, 8. Retaining ring, 9. Bearing support, 10. Lifting bar, 11. Retaining groove, 12. Block, 13. Notch, 14. Annular groove 2, 15. Ball. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figures 1 to 3 In the embodiment, a cooling structure of a turbine main shaft bearing is provided, which includes a main shaft 1, a bearing 1 2, a bearing 2 3 and a rotating ring 4. The bearing 1 2, the bearing 2 3 and the rotating ring 4 are all surrounded on the outer surface of the main shaft 1. The upper end surface of the bearing 1 2 is clamped with the lower end surface of the bearing 2 3, and the inner side surface of the bearing 1 2 is clamped with the outer side surface of the main shaft 1. The rotating ring 4 is placed above the bearing 2 3. The rotating ring 4 is rotatably connected to the outer side surface of the main shaft 1. A plurality of swing blades 5 are provided on the outer surface of the rotating ring 4. The swing blades 5 are fixedly connected to the outer side surface of the rotating ring 4. The swing blades 5 are placed above the bearing 2 3. A plurality of through holes 6 are provided on the main shaft 1. The cross-sectional shape of the through hole 6 is C-shaped and the two ends of the C are distributed up and down. The through holes 6 are evenly surrounded on the outer surface of the main shaft 1 with the main shaft 1 as the center. The through holes 6 in the same plane are a group and there are two groups. The two groups of through holes 6 correspond to the positions of the bearing 1 2 and the bearing 2 3 respectively.

[0020] like Figure 2 and Figure 3 As shown, an annular groove 7 is provided on the inner side surface of the bearing 2, and a snap ring 8 is provided on the outer side surface of the main shaft 1. The snap ring 8 is placed between the C-shaped ends of the through hole 6. The snap ring 8 is fixedly connected to the outer side surface of the main shaft 1. The annular groove 7 and the snap ring 8 correspond to each other. The bearing 2 is clamped to the main shaft 1 through the cooperation of the annular groove 7 and the snap ring 8.

[0021] like Figure 1 and Figure 3 As shown, a bearing support 9 is provided on the main shaft 1. The bearing support 9 surrounds the outer surface of the main shaft 1 and is fixedly connected to the outer surface of the main shaft 1. A plurality of lifting bars 10 are provided on the upper end surface of the bearing support 9. The lifting bars 10 are evenly distributed on the upper end surface of the bearing support 9 with the main shaft 1 as the center. The lower end surface of the lifting bar 10 is fixedly connected to the upper end surface of the bearing support 9, and the upper end surface of the lifting bar 10 contacts the lower end surface of the bearing 2.

[0022] like Figure 2 and Figure 3 As shown, a plurality of slots 11 are provided on the upper end surface of bearing 1 2. The cross-sectional shape of the slots 11 is small at the top and large at the bottom. The slots 11 are evenly distributed on the upper end surface of bearing 1 2 with the main shaft 1 as the center. A plurality of blocks 12 are provided on the lower end surface of bearing 2 3. The upper end surface of the block 12 is fixedly connected to the lower end surface of bearing 2 3. The lower end of the block 12 is placed in the slot 11. The block 12 corresponds to the slot 11 one by one. The height of the block 12 is higher than the height of the slot 11. Bearing 1 2 is connected to bearing 2 3 through the cooperation of the slot 11 and the block 12.

[0023] like Figure 1 As shown, a notch 13 is provided on the rotating ring 4 . The width of the notch 13 is smaller than the diameter of the main shaft 1 . The main shaft 1 passes through the notch 13 and is placed in the rotating ring 4 .

[0024] like Figure 4 As shown, a second annular groove 14 is provided on the outer side surface of the main shaft 1, and the inner side surface of the rotating ring 4 is placed in the second annular groove 14. A plurality of balls 15 are provided on the inner side surface of the rotating ring 4. The outer side surfaces of the balls 15 are placed in the rotating ring 4 and are rotatably connected to the rotating ring 4. The outer side surfaces of the balls 15 are in contact with the inner bottom surface of the second annular groove 14. The rotating ring 4 is rotatably connected to the main shaft 1 through the cooperation between the balls 15 and the second annular groove 14.

[0025] When in use, first, insert bearing 1 2 and bearing 2 3 into the main shaft 1 in sequence. Bearing 1 2 is fixedly connected to the main shaft 1 through the cooperation of the snap ring 8 and the annular groove 1 7, and the bearing 1 2 and bearing 2 3 are clamped together through the groove 11 and the clamping block 12. Because the clamping block 12 is higher than the groove 11, there is a gap between bearing 1 2 and bearing 2 3. There is also a gap between the bottom of bearing 1 2 and the bearing support 9 due to the lifting bar 10. Bearing 1 2 and bearing 2 3 correspond to the positions of the two groups of through holes 6 respectively. The upper and lower holes of the C-shaped through hole 6 need to leak a part to facilitate air entry. Then, the rotating ring 4 is clamped into the annular groove 2 14 on the main shaft 1 through the notch 13 of the rotating ring 4. The rotating ring 4 is allowed to rotate smoothly with the annular groove 2 14 through the rotation of the ball 15. In this way, the oscillating blade 5 can be driven when there is air circulation, accelerating air circulation. All components are firmly connected and there is a gap for air to enter, so that the ambient temperature of bearing 2 3 and bearing 1 is reduced, thereby achieving the purpose of improving the cooling effect of air cooling.

Claims

1. A cooling structure for a main shaft bearing of a turbine, characterized in that: The invention comprises a main shaft (1), a bearing 1 (2), a bearing 2 (3) and a rotating ring (4), wherein the bearing 1 (2), the bearing 2 (3) and the rotating ring (4) are all surrounded on the outer surface of the main shaft (1), the upper end surface of the bearing 1 (2) is clamped with the lower end surface of the bearing 2 (3), the inner side surface of the bearing 1 (2) is clamped with the outer side surface of the main shaft (1), the rotating ring (4) is placed above the bearing 2 (3), the rotating ring (4) is rotatably connected to the outer side surface of the main shaft (1), and the outer surface of the rotating ring (4) is provided with a plurality of The swinging air piece (5) is fixedly connected to the outer side surface of the rotating ring (4), and the swinging air piece (5) is placed above the second bearing (3). The main shaft (1) is provided with a plurality of through holes (6). The cross-sectional shape of the through holes (6) is C-shaped, and the two ends of the C-shaped are distributed up and down. The through holes (6) are evenly surrounded on the outer side surface of the main shaft (1) with the main shaft (1) as the center. The through holes (6) in the same plane are a group and there are two groups. The two groups of through holes (6) correspond to the positions of the first bearing (2) and the second bearing (3) respectively.

2. The cooling structure of a turbine main shaft bearing according to claim 1, characterized in that: An annular groove (7) is provided on the inner side surface of the bearing (2), and a snap ring (8) is provided on the outer side surface of the main shaft (1). The snap ring (8) is placed between the two ends of the C-shape of the through hole (6). The snap ring (8) is fixedly connected to the outer side surface of the main shaft (1). The annular groove (7) and the snap ring (8) correspond to each other, and the bearing (2) is snap-connected to the main shaft (1) through the cooperation of the annular groove (7) and the snap ring (8).

3. The cooling structure of a turbine main shaft bearing according to claim 2, characterized in that: A bearing support (9) is provided on the main shaft (1), and the bearing support (9) surrounds the outer side of the main shaft (1) and is fixedly connected to the outer side of the main shaft (1). A plurality of lifting strips (10) are provided on the upper end surface of the bearing support (9), and the lifting strips (10) are evenly distributed on the upper end surface of the bearing support (9) with the main shaft (1) as the center. The lower end surface of the lifting strip (10) is fixedly connected to the upper end surface of the bearing support (9), and the upper end surface of the lifting strip (10) contacts the lower end surface of the bearing (2).

4. The cooling structure of a turbine main shaft bearing according to claim 1, characterized in that: The upper end surface of the bearing 1 (2) is provided with a plurality of slots (11), the cross-sectional shape of the slots (11) being smaller at the top and larger at the bottom, the slots (11) being evenly distributed on the upper end surface of the bearing 1 (2) with the main shaft (1) as the center, the lower end surface of the bearing 2 (3) is provided with a plurality of blocks (12), the upper end surface of the blocks (12) being fixedly connected to the lower end surface of the bearing 2 (3), the lower end of the blocks (12) being placed in the slots (11), the blocks (12) corresponding to the slots (11) one by one, the height of the blocks (12) being higher than the height of the slots (11), and the bearing 1 (2) being engaged with the bearing 2 (3) through the cooperation of the slots (11) and the blocks (12).

5. The cooling structure of a turbine main shaft bearing according to claim 1, characterized in that: A notch (13) is provided on the rotating ring (4), the width of the notch (13) is smaller than the diameter of the main shaft (1), and the main shaft (1) passes through the notch (13) and is placed in the rotating ring (4).

6. The cooling structure of a turbine main shaft bearing according to claim 1, characterized in that: The outer surface of the main shaft (1) is provided with an annular groove 2 (14), the inner surface of the rotating ring (4) is placed in the annular groove 2 (14), and a plurality of balls (15) are provided on the inner surface of the rotating ring (4). The outer surface of the balls (15) is placed in the rotating ring (4) and is rotatably connected to the rotating ring (4). The outer surface of the balls (15) is in contact with the inner bottom surface of the annular groove 2 (14), and the rotating ring (4) is rotatably connected to the main shaft (1) through the cooperation between the balls (15) and the annular groove 2 (14).

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