A wind power main shaft coupling structure

Abstract

The wind power main shaft coupling structure only has one locking ring; an outer conical surface is arranged on the outer periphery of the gear box input end connecting sleeve, and cooperates with the inner conical hole of the locking ring, so that the fixed connection of the wind power main shaft connecting shaft and the gear box connecting sleeve is realized; since the original inner locking ring is omitted, the cost of the locking disc is greatly reduced, the cost reduction requirement of the matching locking disc of the wind power complete machine production enterprise is met, the quality of the locking disc is ensured, and thus the wind power complete machine production enterprise and the locking disc production enterprise maintain the leading cost advantage in the market competition.

Description

Technical Field

[0001] This invention relates to the field of wind turbine assembly technology, specifically to a wind turbine main shaft connection structure. Background Technology

[0002] With the rapid development of clean energy in China, more and more wind turbines are being built and put into use. Among wind turbine technologies, the doubly-fed induction generator (DFIG) is a widely used technology. In a DFIG, the wind turbine main shaft and gearbox are fixedly connected by a locking disc. The existing locking disc structure includes an inner locking ring and an outer locking ring. The annular conical surfaces of the inner and outer locking rings are used to forcefully compress and generate clamping force to achieve a fixed connection between the wind turbine main shaft and the gearbox. As competition in the domestic wind power sector intensifies, wind turbine manufacturers are demanding higher costs for the locking discs used in conjunction with the turbines. However, there is no room for further cost reduction in the original locking discs. Therefore, how to further reduce the production cost of locking discs without compromising product quality has become a technical challenge that locking disc manufacturers must solve. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention discloses a wind turbine main shaft connection structure, which has only one locking ring; by setting an outer conical surface on the outer circumference of the gearbox input end connecting sleeve, which cooperates with the inner conical hole of the locking ring, the fixed connection between the wind turbine main shaft connecting shaft and the gearbox connecting sleeve is realized; since the wind turbine main shaft connection structure eliminates the original inner locking ring, the cost of the locking disc is greatly reduced.

[0004] To achieve the aforementioned objective, the present invention employs the following technical solution: a wind turbine main shaft connection structure for connecting the wind turbine main shaft and a gearbox; a connecting sleeve is provided at the input end of the gearbox, and a connecting shaft is provided at the rear end of the wind turbine main shaft; the connecting sleeve and the connecting shaft are fixedly connected by a locking ring and bolts.

[0005] The connecting sleeve is a hollow circular sleeve with evenly distributed threaded holes on its outer end face. It has an outer conical surface near the outer circumference and a connecting hole at its center. The connecting shaft is a stepped shaft, comprising a shaft body and a connecting section, the diameter of which is smaller than that of the shaft body. The locking ring is annular with an inner conical hole in the center. An inner flange is located at the smaller diameter end of the inner conical hole, and through holes are evenly distributed axially on the inner flange. When the connecting sleeve and connecting shaft are connected, the outer conical surface of the connecting sleeve is positioned within the inner conical hole of the locking ring. At this time, a gap exists between the end face of the connecting sleeve and the inner end face of the inner flange of the locking ring. The connecting section is set in the connecting hole of the connecting sleeve. At this time, there is a gap between the connecting section and the connecting hole. The bolt passes through the through hole of the locking ring and engages with the connecting thread hole of the connecting sleeve. When the bolt is tightened, the inner edge of the locking ring gradually approaches the end face of the connecting sleeve along the axis of the connecting sleeve until it is locked in place. After the locking ring is locked in place, the inner conical hole of the locking ring mates with the outer conical surface of the connecting sleeve, so that the inner conical hole of the locking ring applies pressure to the outer conical surface of the connecting sleeve. This pressure forces the connecting hole of the connecting sleeve to hug the outer circular surface of the connecting shaft connecting section, thereby realizing the fixed connection between the connecting sleeve and the connecting shaft.

[0006] Furthermore, a sealing ring is provided at the step difference between the connecting shaft body and the connecting section. During the fixed connection of the connecting sleeve and the connecting shaft, grease is applied between the inner conical hole and the outer conical surface of the connecting sleeve to prevent excessive friction between the inner conical hole and the outer conical surface of the locking ring. At the same time, to ensure sufficient torque transmission after the connecting sleeve and the connecting shaft are fixedly connected, the outer circular surface of the connecting section and the inner circular surface of the connecting hole must be kept clean. To prevent excess grease from contaminating the outer circular surface of the connecting section and the inner circular surface of the connecting hole during the fixed connection process, a sealing ring is specifically provided at the step difference between the connecting shaft body and the connecting section. When excess grease enters the gap between the end face of the connecting sleeve and the inner flange of the locking ring, the sealing ring will prevent excess grease from entering the gap between the outer circular surface of the connecting section and the inner circular surface of the connecting hole, thereby ensuring the cleanliness of the outer circular surface of the connecting section and the inner circular surface of the connecting hole.

[0007] Preferably, several threaded holes are evenly distributed between the through holes of the locking ring. The threaded holes on the locking ring facilitate the disassembly and reassembly of the connecting sleeve and connecting shaft. Under normal circumstances, the inner conical hole of the locking ring and the outer conical surface of the connecting sleeve are in a non-self-locking state. When the bolt between the locking ring and the connecting sleeve is loosened, the locking ring will automatically slide out. However, under certain special circumstances, self-locking occurs between the inner conical hole of the locking ring and the outer conical surface of the connecting sleeve. Therefore, even if the bolt between the locking ring and the connecting sleeve is loosened, the locking ring will not automatically slide out. In this case, the bolt between the locking ring and the connecting sleeve can be removed, a short cylindrical top block can be inserted into the threaded hole of the locking ring, and then a bolt that matches the threaded hole of the locking ring can be replaced and screwed into the threaded hole of the locking ring. The bolt, through the top block, forcibly pushes the locking ring out, thus preventing the problem of being unable to disassemble. The bottom diameter of the threaded hole is equal to the diameter of the through hole, and the diameter of the top block inserted into the threaded hole of the locking ring is larger than the diameter of the connecting threaded hole on the connecting sleeve, preventing the top block from damaging the connecting threaded hole on the connecting sleeve.

[0008] Furthermore, the cone angle of the outer conical surface of the connecting sleeve is equal to the cone angle of the inner conical hole of the locking ring, and its cone angle is greater than 2.3°. With grease, the measured self-locking angle between the inner conical hole of the locking ring and the outer conical surface of the connecting sleeve is about 2.3°. The purpose of designing the cone angle of the outer conical surface and the inner conical hole to be greater than 2.3° is to prevent self-locking between the inner conical hole of the locking ring and the outer conical surface of the connecting sleeve. Under normal circumstances, the cone angle of the outer conical surface and the cone angle of the inner conical hole of the locking ring are designed to be between 2.4° and 2.7°.

[0009] Furthermore, a gap is provided between the inner diameter of the inner flange of the locking ring and the outer circular surface of the connecting shaft body. This gap is the escape gap for excess grease between the inner conical hole and the outer conical surface.

[0010] Furthermore, a gap is provided between the bolt and the through hole of the locking ring, which also serves as an escape gap for excess grease between the inner conical hole and the outer conical surface.

[0011] Due to the adoption of the above-described technical solution, the present invention has the following beneficial effects: The wind turbine main shaft connection structure disclosed in the present invention has only one locking ring; by setting an outer conical surface on the outer circumference of the gearbox input end connecting sleeve, which cooperates with the inner conical hole of the locking ring, the fixed connection between the wind turbine main shaft connecting shaft and the gearbox connecting sleeve is realized; since the wind turbine main shaft connection structure eliminates the original inner locking ring, the cost of the locking disc is greatly reduced. While meeting the cost reduction requirements of wind turbine manufacturers for matching locking discs, the quality of the locking disc is also ensured, thereby enabling wind turbine manufacturers and locking disc manufacturers to maintain a leading cost advantage in market competition. Attached Figure Description

[0012] Figure 1A schematic diagram of the wind turbine main shaft connection structure before locking;

[0013] Figure 2 A schematic diagram of the wind turbine main shaft connection structure after locking;

[0014] Figure 3 This is a partial enlarged schematic diagram (A) of the wind turbine main shaft connection structure;

[0015] Figure 4 This is a schematic diagram of the cross-sectional structure of the connecting sleeve;

[0016] Figure 5 This is a schematic diagram of the connecting shaft.

[0017] Figure 6 This is a schematic diagram of the front end face of the locking ring;

[0018] Figure 7 This is a schematic diagram of the cross-sectional structure of the locking ring.

[0019] In the figure: 1. Connecting sleeve; 1.1. Connecting threaded hole; 1.2. Outer conical surface; 1.3. Connecting hole; 2. Connecting shaft; 2.1. Connecting shaft body; 2.2. Connecting section; 3. Locking ring; 3.1. Through hole; 3.2. Threaded hole; 3.3. Inner conical hole; 4. Sealing ring. Detailed Implementation

[0020] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0021] A wind turbine main shaft connection structure is provided for connecting the wind turbine main shaft and the gearbox. The gearbox input end has a connecting sleeve 1, and the rear end of the wind turbine main shaft has a connecting shaft 2. The connecting sleeve 1 and the connecting shaft 2 are fixedly connected by a locking ring 3 and bolts. The connecting sleeve 1 is a hollow circular sleeve with forty threaded holes 1.1 evenly distributed around its outer end axis on its outer end face. The thread specification is M30. An outer conical surface 1.2 is provided near the outer circumference of the outer end, and a connecting hole 1.3 is provided in the center. The connecting shaft 2 is a stepped shaft, including a connecting shaft body 2.1 and a connecting section 2.2, the diameter of which is smaller than that of the connecting shaft body 2.1. The locking ring 3 is annular, with an inner conical hole 3.3 in the middle. The smaller diameter end of the inner conical hole 3.3 has an inner retaining edge, and forty through holes 3.1 evenly distributed around its inner retaining edge on its axial direction, the diameter of which is 34mm. The outer conical surface 1.2 of the connecting sleeve 1 has a cone angle that is consistent with the locking ring 3.2. The inner conical hole 3.3 of the locking ring 3 has an equal cone angle, designed to be 2.5°. When connecting the connecting sleeve 1 and the connecting shaft 2, lubricant is evenly applied to the surface of the inner conical hole 3.3 of the locking ring 3. A sealing ring 4 is installed at the step difference between the connecting shaft body 2.1 and the connecting section 2.2 of the connecting shaft 2. The outer conical surface 1.2 of the connecting sleeve 1 is set in the inner conical hole 3.3 of the locking ring 3. The connecting section 2.2 of the connecting shaft 2 is set in the connecting hole 1.3 of the connecting sleeve 1. The bolt passes through the through hole 3.1 of the locking ring 3 and engages with the connecting threaded hole 1.1 of the connecting sleeve 1. When the bolt is tightened, the locking ring 3 is gradually tightened into place. Through the cooperation between the inner conical hole 3.3 of the locking ring 3 and the outer conical surface 1.2 of the connecting sleeve 1, the connecting hole 1.3 of the connecting sleeve 1 is forced to hug the outer circular surface of the connecting section 2.2 of the connecting shaft 2, thus achieving a fixed connection between the connecting sleeve 1 and the connecting shaft 2.

[0022] Four threaded holes 3.2 are symmetrically arranged between the through holes 3.1 of the locking ring 3. The thread specification is M36 and the bottom diameter of the threaded holes 3.2 is 34mm.

[0023] The parts of this invention not described in detail are prior art.

Claims

1. A wind turbine main shaft connection structure for connecting a wind turbine main shaft and a gearbox; the gearbox input end is provided with a connecting sleeve (1), and the rear end of the wind turbine main shaft is provided with a connecting shaft (2); characterized in that: The connecting sleeve (1) and the connecting shaft (2) are fixedly connected by the locking ring (3) and bolts; The connecting sleeve (1) is a hollow circular sleeve with connecting threaded holes (1.1) evenly distributed on its outer end face, an outer conical surface (1.2) near the outer circumference of the outer end, and a connecting hole (1.3) in the center; the connecting shaft (2) is a stepped shaft, including a connecting shaft body (2.1) and a connecting section (2.2), the diameter of the connecting section (2.2) being smaller than that of the connecting shaft body (2.1); the locking ring (3) is an annular ring with an inner conical hole (3.3) in the middle, an inner flange at the small diameter end of the inner conical hole (3.3), and through holes (3.1) evenly distributed around the inner flange in the axial direction; when the connecting sleeve (1) and the connecting shaft (2) are fixedly connected, the outer conical surface (1.1) of the connecting sleeve (1) is closed. 2) The connecting section (2.2) of the connecting shaft (2) is set in the inner conical hole (3.3) of the locking ring (3), and the connecting hole (1.3) of the connecting sleeve (1) is set in the connecting hole (1.3). The bolt passes through the through hole (3.1) of the locking ring (3) and engages with the connecting thread hole (1.1) of the connecting sleeve (1). When the bolt is tightened, the locking ring (3) is gradually locked in place. The inner conical hole (3.3) of the locking ring (3) cooperates with the outer conical surface (1.2) of the connecting sleeve (1), forcing the connecting hole (1.3) of the connecting sleeve (1) to hug the outer surface of the connecting section (2.2) of the connecting shaft (2), thereby realizing the fixed connection between the connecting sleeve (1) and the connecting shaft (2). A sealing ring (4) is provided at the step difference between the connecting shaft body (2.1) and the connecting section (2.2) of the connecting shaft (2); The cone angle of the outer conical surface (1.2) of the connecting sleeve (1) is equal to the cone angle of the inner conical hole (3.3) of the locking ring (3), and the cone angle ranges from 2.4° to 2.7°.

2. The wind turbine main shaft connection structure according to claim 1, characterized in that: Several threaded holes (3.2) are evenly distributed between the through holes (3.1) of the locking ring (3); the bottom diameter of the threaded hole (3.2) is equal to the diameter of the through hole (3.1).

3. The wind turbine main shaft connection structure according to claim 1, characterized in that: A gap is provided between the inner diameter of the inner flange of the locking ring (3) and the outer circular surface of the connecting shaft body (2.1) of the connecting shaft (2).

4. The wind turbine main shaft connection structure according to claim 1, characterized in that: A gap is provided between the bolt and the through hole (3.1) of the locking ring (3).

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