Structure for preventing inner oil tank wall from creeping oil for water turbine guide bearing

Abstract

The utility model discloses a spiral blade structure of a water turbine water guide bearing for preventing an inner oil tank wall from creeping oil, and relates to the field of water turbines. The spiral blade structure of the water guide bearing is arranged above the highest oil level on the wall of an inner oil tank of the water guide bearing, the water turbine structure comprises a main shaft with a shaft collar, the shaft collar of the main shaft penetrates into the position between a water guide shoe of the water guide bearing and the wall of the inner oil tank, and the water guide bearing is rotationally connected with the main shaft and makes contact with an oil film. The principle is that when lubricating oil in an oil tank moves relative to the inner wall of the water guide bearing, air pressure is generated in the relative movement of the spiral blades, the lubricating oil is pressed downwards, and the oil level is lowered. The utility model solves the problem that a large amount of lubricating oil splashes out of the oil tank when the water turbine works, can be used for a water guide bearing with a main shaft collar, reduces the oil level of the oil tank, avoids oil leakage, effectively improves the cleanliness inside the water turbine main shaft, reduces the cost, and protects a unit from being influenced by oil stains.

Description

Technical Field

[0001] The utility model belongs to the technical field of water turbines, in particular to a structure of a water turbine water guide bearing to prevent oil from creeping onto the wall of an inner oil tank. Background Art

[0002] A hydraulic turbine is a power device that converts water flow energy into rotational mechanical energy. As a component of the rotating housing, one of the three main components of a hydraulic turbine, the water-guide bearing is responsible for withstanding the radial forces of the turbine's rotation, maintaining the rotation of the runner and main shaft around the center of rotation, and preventing the shaft from swinging during high-speed rotation. Furthermore, the oil within the water-guide bearing's oil tank also lubricates and cools the high-speed rotation of the main shaft. The utility model is used for a water-guide bearing in a hydraulic turbine. In the water-guide bearing, ambient-temperature lubricating oil submerges the oil tank below it. During high-speed rotation, the oil within the oil tank flows through holes in the main shaft collar and enters the space between the water-guide bearing and the main shaft collar, forming an oil film that lubricates and cools the bearing, absorbing heat generated by the high-speed rotation of the main shaft and reducing friction between the two. The high-temperature lubricating oil then flows through the bearing body into a cooler for cooling. The cooled lubricating oil then flows back into the oil tank, where it continues to cool and forms a new oil film, achieving a repetitive lubrication and cooling cycle. However, in actual use, the oil in the oil tank wall of the water guide bearing will rise with the high-speed rotation of the main shaft, climb the inner wall, and leak out of the oil tank, causing oil leakage. Therefore, this utility model designs a structure to prevent oil from climbing the inner tank wall of the water guide bearing of the turbine. Utility Model Content

[0003] In order to solve the problem that the oil on the inner tank wall of the water guide bearing rises with the high-speed rotation of the main shaft, climbs the inner wall and leaks out of the tank, the utility model provides a structure for preventing the inner tank wall of the water guide bearing of the turbine from climbing oil.

[0004] The technical solution adopted in this utility model is:

[0005] A structure for preventing oil from creeping up the inner tank wall of a water-turbine water-guide bearing comprises a main shaft collar, water-guide shoes, a cooler, and an inner tank wall. The main shaft collar extends within the lower tank, between the inner tank wall and the water-guide shoes, and contacts the oil film of the water-guide shoes. The water-guide shoes are supported within the lower tank by shoe seats and a bearing body. An outer tank and a sealing plate are located above the water-guide shoes to prevent oil film splashing. The bearing body separates the upper and lower tanks, and an inclined wedge and a pressure-resistant block are provided between the bearing body and the water-guide shoes for gap adjustment. The cooler is located near the outer wall of the lower tank. The inner tank wall extends between the main shaft collar and the main shaft and has spiral blades thereon to prevent oil leakage. During high-speed operation of the main shaft collar, the spiral blades on the inner tank wall move relative to the main shaft, generating air pressure that presses the lubricating oil downward, preventing it from creeping up the inner wall.

[0006] The beneficial effect of the utility model is that, compared with the water-guided bearing without spiral blades, the oil level between the inner oil tank wall and the main shaft collar can be well lowered to prevent the oil from splashing out of the inner oil tank wall and avoiding oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a partial cross-sectional structural diagram of the front side of the utility model water guide bearing with spiral blades;

[0008] Figure 2 It is a schematic diagram of the structure of spiral blades on the inner wall of the water guide bearing of the utility model.

[0009] Figure 3 A schematic diagram of the overall cross-sectional structure of a water-guided bearing provided with spiral blades according to the utility model, viewed from above.

[0010] In the figure, 1. spindle collar, 2. water guide shoe, 3. cooler, 4. inner oil tank wall, 5. bearing body, 6. lower oil tank, 7. wedge, 8. pressure plate, 9. compression block, 10. tile seat, 11. water inlet pipe, 12. upper oil tank, 13. ball valve, 14. base, 15. outer oil tank, 16. sealing plate, 17. oil tank cover, 18. bolt, 19. nut, 20. screw, 21. spiral blade. DETAILED DESCRIPTION

[0011] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0012] See also Figure 1-3 This embodiment provides a water-guided bearing structure for a hydraulic turbine, including a main shaft collar 1, a water guide shoe 2, a cooler 3, and an inner oil tank wall 4. The main shaft collar 1 is in oil film contact with the water guide shoe 2. The cooler 3 uses a countercurrent heat exchange method to allow the two liquids to exchange heat and cold to complete the cooling of the lubricating oil. The inner oil tank wall 4 extends between the main shaft and the main shaft collar 1. The bearing body 5 is bolted to the lower oil tank 6. The inclined wedge 7 and the pressure plate 8 are bolted to the bearing body 5. The bearing body 5 adjusts the gap between the water guide shoe 2 and the main shaft collar 1 through the inclined wedge 7 and the pressure block 9. The shoe seat 10 is bolted to the bearing body 5 and is connected to the bearing body 5 together. The support water guide shoe 2 bears gravity and radial force. The water inlet pipe 11 is fixed on the wall of the upper oil tank 12. The water outlet end of the water inlet pipe 11 is connected to the cooler 3. The ball valve 13 and the base 14 are arranged at the bottom of the lower oil tank 6 and are bolted to it to control the inlet and outlet of the lubricating oil. The outer oil tank 15 and the sealing plate 16 are bolted to the bearing body 5 and the main shaft collar 1 to separate the upper and lower oil tanks to prevent the oil film from splashing to the upper oil tank. The oil tank cover 17 is above the upper oil tank, covering the entire oil tank. The bolts 18 hold the oil tank cover 17 and the upper oil tank 12 wall together. The nuts 19 and screws 20 hold the bearing body 5 and the lower oil tank wall 6 together.

[0013] When the water-guide bearing of the turbine is working, the oil in the oil tank is cooled by the cooler 5, and then moves to between the inner oil tank wall 4 and the main shaft collar 1, and enters between the water guide shoe 2 and the main shaft collar 1 through the holes on the main shaft collar, forming an oil film for lubrication and cooling. At the same time, the outer oil tank 15 and the sealing plate 16 will prevent the formed oil film from splashing and block it from entering the upper oil tank 12. Then the high-temperature lubricating oil will return to the lower oil tank through the holes on the bearing body 5, and use the cooler to take away the heat, completing the cycle.

[0014] In the present invention, when the lubricating oil moves to between the inner oil tank wall 4 and the main shaft collar 1, the spiral blades 21 will prevent the lubricating oil from climbing the inner oil tank wall and leaking out, allowing it to flow into the space between the water guide shoe 2 and the main shaft collar 1 to form an oil film, which not only isolates the outside world but also lowers the oil level.

[0015] The working principle of the present invention is that when the main shaft rotates at high speed, the lubricating oil and the inner oil tank wall will form relative movement. When the spiral blades are provided, the rotation direction of the spiral blades is opposite to the direction of movement of the lubricating oil, which will form air pressure, pressing the moving lubricating oil downward, and the oil level will decrease. Note: (the horizontal center line ① in the figure is the lowest oil level, the horizontal center line ② is the normal oil level, and the horizontal center line ③ is the highest oil level).

[0016] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A structure for preventing oil from creeping onto the inner oil tank wall of a water turbine water guide bearing, characterized in that: The invention comprises a main shaft collar (1), a water guide shoe (2), a cooler (3) and an inner oil tank wall (4); the main shaft collar (1) extends into the space between the inner oil tank wall (4) and the water guide shoe (2) in the lower oil tank (6) and contacts the oil film of the water guide shoe (2); the water guide shoe (2) is supported by a shoe seat (10) and a bearing body (5) in the lower oil tank (6); an outer oil tank (15) and a sealing plate (16) are provided on the upper part of the water guide shoe (2) to prevent the oil film from splashing; the bearing body (5) separates the upper and lower oil tanks and has an inclined wedge (7) and an anti-pressure block (9) between the main shaft collar (1) and the water guide shoe (2) to adjust the gap; the cooler (3) is located near the outer wall of the lower oil tank (6); the inner oil tank wall (4) extends into the space between the main shaft collar (1) and the main shaft; and a spiral blade (21) is provided on the inner oil tank wall (4).

2. The structure for preventing oil from creeping onto the inner oil tank wall of a water turbine water guide bearing according to claim 1, characterized in that: The spiral blade (21) is arranged above the highest oil level, and the spiral blade (21) is a part of the inner wall.

3. The structure for preventing oil from creeping onto the inner oil tank wall of a water turbine water guide bearing according to claim 1, characterized in that: The spiral blade (21) is higher than the highest oil level.

4. The structure for preventing oil from creeping onto the inner oil tank wall of a water turbine water guide bearing according to claim 2, characterized in that: The rotation direction of the spiral blade (21) is the same as that of the main shaft of the turbine.

5. The structure for preventing oil from creeping onto the inner oil tank wall of a water turbine water guide bearing according to claim 1, characterized in that: The upper end of the spiral blade (21) is in clearance fit with the oil retaining ring on the inner oil tank wall.

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