Semi-direct-drive sealing structure

Abstract

The utility model relates to the technical field of sealing structures, in particular to a semi-direct-drive sealing structure which comprises a gearbox output shaft, a threading pipe body, a threading pipe bearing and a combined sealing structure, the threading pipe body is arranged in the gearbox output shaft, and the threading pipe bearing is arranged in the gearbox output shaft. The threading pipe bearing and the combined sealing structure are arranged between the threading pipe body and the gearbox output shaft in parallel; and a plurality of layers of contact sealing structure sealing rings are mounted on the threading pipe. The combined sealing structure comprises a first oil slinger, a second oil slinger, two oil retaining rings, a first distance ring, a contact type sealing O-shaped ring, a threading pipe end cover, a second distance ring, a lining, a clamping spring, a contact type sealing structure and a threading pipe small end cover. The semi-direct-drive output end sealing structure has the effects that the sealing performance of the semi-direct-drive output end is improved, and the problems of bearing oil leakage and oil mist overflow of the semi-direct-drive output end sealing structure are solved.

Description

Technical Field

[0001] The present application relates to the technical field of sealing structures, and in particular to a semi-direct drive sealing structure. Background Art

[0002] As the wind power industry enters the era of grid parity, offshore wind power has great development advantages, and semi-direct drive wind power gearboxes have emerged as the times require. Compared with traditional double-fed units and direct drive products, semi-direct drive gearboxes have the advantages of light weight, short transmission chain, and small installation size, which is an inevitable trend for the development of future offshore wind turbines.

[0003] However, the semi-direct drive is directly integrated with the motor, and the sealing performance of its output end is an important indicator for determining whether the motor can operate reliably. Compared with traditional double-fed units, both the inner and outer rings of the bearing at the cable penetration of the semi-direct drive gearbox are in a rotating state. It is very crucial to prevent lubricating oil from flowing along the shaft to the outside of the gearbox. The contact sealing structure in the related art is prone to aging and has a short service life, and only uses the method of blocking and preventing oil, which cannot meet the operation requirements, resulting in problems of bearing oil leakage and oil mist overflow in the semi-direct drive output end sealing structure. Summary of the Utility Model

[0004] In order to improve the sealing performance of the semi-direct drive output end and solve the problems of bearing oil leakage and oil mist overflow in the semi-direct drive output end sealing structure, the present application provides a semi-direct drive sealing structure.

[0005] The semi-direct drive sealing structure provided by the present application adopts the following technical solutions:

[0006] A semi-direct drive sealing structure includes a gearbox output shaft, a cable penetration body, a cable penetration bearing, and a combined sealing structure. The cable penetration body is arranged inside the gearbox output shaft, and the cable penetration bearing and the combined sealing structure are arranged side by side between the cable penetration body and the gearbox output shaft;

[0007] A multi-layer contact seal structure sealing ring is installed on the cable penetration. The combined sealing structure includes a first oil slinger, a second oil slinger, two oil retaining rings, a first spacer ring, a contact seal O-ring, a cable penetration end cover, a second spacer ring, a bushing, a circlip, a contact sealing structure, and a cable penetration small end cover;

[0008] The oil retaining rings and the first spacer ring are arranged on the side close to the gearbox output shaft and are arranged in sequence along the direction away from the cable penetration bearing; a first oil return hole is opened on the oil retaining ring, a plurality of annular oil collecting grooves and a second oil return hole are opened on the output shaft, and the first oil return hole, the oil collecting groove, and the second oil return hole are correspondingly communicated;

[0009] The first oil slinger ring, the second oil slinger ring, the second spacing ring and the bushing are arranged on the side close to the through-tube body and are arranged in sequence along the direction away from the through-tube bearing; the contact seal O-ring is installed on the through-tube body and has multiple layers, and the multiple layers of the contact seal O-rings are respectively located between the through-tube bearing and the first oil slinger ring, between the first oil slinger ring and the second oil slinger ring, and between the second oil slinger ring and the second spacing ring;

[0010] The spacing ring and the bushing are axially fixed on the through-tube by a circlip, and the contact seal structure is axially fixed by a small end cover of the through-tube.

[0011] By adopting the above technical solutions, a sealing structure design is carried out by using a variety of combined methods of oil blocking, oil guiding and oil prevention, the traditional bearing sealing method is improved, and a sealing method combining multiple groups of oil drainage structures and contact sealing structures is adopted to improve the reliability of the bearing lubrication sealing system, avoid the bearing lubricating oil at the through-tube from flowing out of the gearbox along the shaft, thereby improving the sealing performance of the semi-direct drive output end and improving the problems of bearing oil leakage and oil mist overflow of the sealing structure at the semi-direct drive output end.

[0012] Optionally, the oil baffle ring and the first oil slinger ring form a first labyrinth seal, the oil baffle ring, the through-tube bearing and the first oil slinger ring enclose a first oil return cavity, the first oil return cavity communicates with the corresponding first oil return hole, and the lubricating oil and oil mist in the first oil return cavity flow back to the gearbox body through the corresponding first oil return hole, oil collecting groove and second oil return hole.

[0013] By adopting the above technical solutions, based on the problem of easy oil leakage of the through-tube body at the output end of the semi-direct drive gearbox, the sealing structure of the through-tube bearing at the through-tube is optimized in structure design. Through a labyrinth mechanical sealing structure, a sealing structure composed of multiple groups of oil blocking structures, multiple groups of oil return structures and multiple groups of labyrinth sealing mechanisms is formed. The number of layers of the labyrinth seal can also be adjusted according to the internal space of the gearbox design, and can be increased to three or even four layers according to the actual situation, which helps to improve the reliability of the bearing lubrication seal at the through-tube, avoid the overflow of bearing lubricating oil and oil mist, improve the operation efficiency of the gearbox, and ensure the safe and reliable operation of the gearbox.

[0014] Optionally, the first oil slinger ring is provided with a first concave oil collecting groove.

[0015] By adopting the above technical solutions, two oil blocking ring grooves with different heights are formed on the first oil slinger ring, which can block the leaked oil and oil mist from flowing out of the gearbox along the axis.

[0016] Optionally, the oil baffle ring and the second oil slinger ring form a second labyrinth seal, and the two oil baffle rings and the second oil slinger ring are arranged to form a second oil return cavity, and the second oil return cavity is connected to the corresponding first oil return hole, and the lubricating oil and oil mist in the second oil return cavity are returned to the gear box body through the corresponding first oil return hole, the oil collecting tank and the second oil return hole.

[0017] Optionally, a second concave oil collecting groove is provided on the second oil slinger ring.

[0018] By adopting the above technical solution, two oil-blocking ring grooves of unequal heights are formed on the second oil slinger ring, which can prevent leaked oil and oil mist from flowing out of the gear box along the axial direction.

[0019] Optionally, a third oil return cavity is formed between the oil retaining ring, the first distance ring, the second distance ring, the bushing and the end cover of the wire threading tube. The first distance ring is also provided with a first oil return hole. Most of the first distance rings have at least four first oil return holes, and at least four first oil return holes are evenly distributed along the circumference of the first distance ring; the lubricating oil and oil mist in the third oil return cavity flow back to the gear box body through the first oil return hole on the first distance ring and the corresponding oil collecting tank and the second oil return hole.

[0020] Optionally, the contact sealing O-ring is further arranged between the threading tube end cover and the output shaft, and the contact sealing structure is arranged between the threading tube end cover, the bushing and the threading tube small end cover.

[0021] The adoption of the above technical solution helps to prevent lubricating oil from leaking along the upper end of the threading pipe end cover.

[0022] Optionally, the bushing is a hardened bushing.

[0023] By adopting the above technical solution, the setting of the hardened bushing helps to better meet the contact surface requirements of the contact sealing structure. The contact sealing structure forms a skeleton oil seal and is axially fixed by the small end cover of the threading tube, providing an additional layer of protection against oil leakage.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The sealing structure is designed with a combination of oil-blocking, oil-guiding, and oil-proof methods, improving the traditional bearing sealing method. The sealing method of multiple oil-draining structures and contact sealing structures improves the reliability of the bearing lubrication and sealing system, preventing the bearing lubricating oil at the threading tube from flowing out of the gearbox along the shaft, thereby improving the sealing performance of the semi-direct drive output end and solving the problems of oil leakage and oil mist overflow in the sealing structure of the semi-direct drive output end.

[0026] 2. Through the labyrinth mechanical seal structure, a sealing structure composed of multiple groups of oil retaining structures, multiple groups of oil return structures, and multiple groups of labyrinth seal mechanisms is formed. The number of layers of the labyrinth seal can also be adjusted according to the internal space of the gearbox design, and can be increased to three layers, four layers or even more layers according to the actual situation, which helps to improve the reliability of the bearing lubrication seal at the wire conduit, avoid the overflow of bearing lubricating oil and oil mist, improve the operating efficiency of the gearbox, and ensure the safe and reliable operation of the gearbox;

[0027] 3. The setting of the hardened bushing helps to better meet the requirements of the contact seal structure for the contact surface. The contact seal structure forms a skeleton oil seal and is axially fixed through the small end cover of the wire conduit, providing an additional layer of protection against oil leakage. Brief Description of the Drawings

[0028] Figure 1 is the overall structural cross-sectional view of a semi-direct drive seal structure according to an embodiment of the present application.

[0029] Figure 2 is Figure 1 the enlarged view of the W position in

[0030] Figure 3 is Figure 1 the enlarged view of the U position in

[0031] Description of the Reference Numerals: 1, output shaft; 11, oil collecting groove; 12, second oil return hole; 2, wire conduit body; 3, wire conduit bearing; 4, combined seal structure; 40, first oil slinger; 401, first concave oil collecting groove; 402, first oil return cavity; 41, second oil slinger; 411, second concave oil collecting groove; 412, second oil return cavity; 42, oil retaining ring; 421, first oil return hole; 43, first spacer ring; 431, third oil return cavity; 44, contact seal O-ring; 45, wire conduit end cover; 46, second spacer ring; 47, bushing; 48, circlip; 49, contact seal structure; 50, small end cover of the wire conduit. Detailed Description of the Embodiment

[0032] The following will Figures 1-3 further elaborate on the present application in detail with reference to the accompanying

[0033] An embodiment of the present application discloses a semi-direct drive seal structure. Referring to Figures 1-3 , a semi-direct drive seal structure includes a gearbox output shaft 1, a wire conduit body 2, a wire conduit bearing 3, and a combined seal structure 4. The wire conduit body 2 is arranged inside the gearbox output shaft 1, and the wire conduit bearing 3 and the combined seal structure 4 are arranged in parallel between the wire conduit body 2 and the gearbox output shaft 1.

[0034] A multi-layer contact sealing structure sealing ring is installed on the conduit. The combined sealing structure 4 includes a first oil slinger 40, a second oil slinger 41, two oil retaining rings 42, a first spacing ring 43, a contact sealing O-ring 44, a conduit end cap 45, a second spacing ring 46, a bushing 47, a circlip 48, a contact sealing structure 49 and a small conduit end cap 50. The oil retaining rings 42 and the first spacing ring 43 are arranged on the side close to the output shaft 1 of the gearbox and are arranged in sequence along the direction away from the conduit bearing 3; a first oil return hole 421 is opened on the oil retaining ring 42, a plurality of annular oil collecting grooves 11 and a second oil return hole 12 are opened on the output shaft 1, and the first oil return hole 421, the oil collecting groove 11 and the second oil return hole 12 are correspondingly communicated.

[0035] The first oil slinger 40, the second oil slinger 41, the second spacing ring 46 and the bushing 47 are arranged on the side close to the conduit body 2 and are arranged in sequence along the direction away from the conduit bearing 3; the contact sealing O-ring 44 is installed on the conduit body 2 and has multiple layers, and the multiple layers of contact sealing O-rings 44 are respectively located between the conduit bearing 3 and the first oil slinger 40, between the first oil slinger 40 and the second oil slinger 41, and between the second oil slinger 41 and the second spacing ring 46. The spacing rings and the bushing 47 are axially fixed on the conduit by a circlip 48, and the contact sealing structure 49 is axially fixed by a small conduit end cap 50.

[0036] The sealing structure is designed by adopting a variety of combined methods of oil retaining, oil guiding and oil prevention, improving the traditional bearing sealing method, and the sealing method of combining multiple groups of oil drainage structures and contact sealing structures, improving the reliability of the bearing lubrication sealing system, avoiding the lubricating oil of the bearing at the conduit from flowing out of the gearbox along the shaft, thereby improving the sealing performance of the semi-direct drive output end and improving the problems of oil leakage and oil mist overflow of the bearing of the semi-direct drive output end sealing structure.

[0037] Refer to Figures 1-3 , the oil retaining ring 42 and the first oil slinger 40 form a first labyrinth seal, the oil retaining ring 42, the conduit bearing 3 and the first oil slinger 40 enclose a first oil return cavity 402, the first oil return cavity communicates with the corresponding first oil return hole 421, and the lubricating oil and oil mist in the first oil return cavity 402 flow back into the gearbox body through the corresponding first oil return hole 421, the oil collecting groove 11 and the second oil return hole 12.

[0038] Based on the problem of easy oil leakage at the output end of the through-tube body 2 of the semi-direct drive gearbox, this application optimizes the sealing structure of the through-tube bearing 3 at the through-tube. Through a labyrinth mechanical sealing structure, a sealing structure composed of multiple groups of oil-blocking structures, multiple groups of oil-return structures, and multiple groups of labyrinth sealing mechanisms is formed. The number of layers of the labyrinth seal can also be adjusted according to the internal space of the gearbox design and can be increased to three or even four layers according to the actual situation, which helps to improve the lubrication and sealing reliability of the bearing at the through-tube, avoid the overflow of bearing lubricating oil and oil mist, improve the operating efficiency of the gearbox, and ensure the safe and reliable operation of the gearbox.

[0039] Referring to Figures 1-3 , a first concave oil-collecting groove 401 is provided on the first oil-throwing ring 40. This makes two oil-blocking ring grooves with different heights formed on the first oil-throwing ring 40, which can block the leaked oil and oil mist from flowing out of the gearbox along the axial direction. The oil-blocking ring 42 and the second oil-throwing ring 41 form a second labyrinth seal. The two oil-blocking rings 42 and the second oil-throwing ring 41 enclose to form a second oil-return cavity 412. The second oil-return cavity 412 is communicated with the corresponding first oil-return hole 421. The lubricating oil and oil mist in the second oil-return cavity 412 flow back into the gearbox body through the corresponding first oil-return hole 421, the oil-collecting groove 11, and the second oil-return hole 12. A second concave oil-collecting groove 411 is provided on the second oil-throwing ring 41, which makes two oil-blocking ring grooves with different heights formed on the second oil-throwing ring 41, which can block the leaked oil and oil mist from flowing out of the gearbox along the axial direction.

[0040] Referring to Figures 1-3 , a third oil-return cavity 431 is formed by enclosing the oil-blocking ring 42, the first spacer ring 43, the second spacer ring 46, the bushing 47, and the through-tube end cover 45. The first spacer ring 43 is also provided with a first oil-return hole 421. There are at least four first oil-return holes 421 on most of the first spacer rings 43, and at least four first oil-return holes 421 are evenly distributed along the circumference of the first spacer ring 43. The lubricating oil and oil mist in the third oil-return cavity 431 flow back into the gearbox body through the first oil-return hole 421 on the first spacer ring 43 and the corresponding oil-collecting groove 11 and the second oil-return hole 12.

[0041] Referring to Figures 1-3 , a contact sealing O-ring 44 is also arranged between the through-tube end cover 45 and the output shaft 1, and a contact sealing structure 49 is arranged between the through-tube end cover 45, the bushing 47, and the through-tube small end cover 50, which helps to prevent the lubricating oil from leaking along the upper end of the through-tube end cover 45. The bushing 47 is the hardened bushing 47. The setting of the hardened bushing 47 helps to better meet the requirements of the contact sealing structure 49 for the contact surface. The contact sealing structure 49 forms a skeleton oil seal and is axially fixed by the through-tube small end cover 50, providing an additional layer of anti-oil-leakage guarantee.

[0042] The implementation principle of a semi-direct drive sealing structure in an embodiment of the present application is as follows: Through a labyrinth mechanical sealing structure, a sealing structure composed of multiple sets of oil-blocking structures, multiple sets of oil-return structures, and multiple sets of labyrinth sealing mechanisms is formed. Lubricating oil can enter the first oil-return cavity 402, the second oil-return cavity 412, and the third oil-return cavity 431, and flow back into the gearbox body through the first oil-return holes 421, the oil-collecting groove 11, and the second oil-return holes 12 corresponding to the first oil-return cavity 402, the second oil-return cavity 412, and the third oil-return cavity 431. The sealing method combining multiple sets of oil-drainage structures and contact sealing structures improves the reliability of the bearing lubrication sealing system, avoids the bearing lubricating oil at the wire conduit flowing out of the gearbox along the shaft, thereby improving the sealing performance of the semi-direct drive output end and solving the problems of bearing oil leakage and oil mist overflow at the semi-direct drive output end sealing structure.

[0043] The above are all preferred embodiments of the present application. The protection scope of the present application is not limited accordingly. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A semi-direct drive sealing structure, characterized in that: It includes a gearbox output shaft (1), a conduit body (2), a conduit bearing (3) and a combined seal structure (4). The conduit body (2) is arranged inside the gearbox output shaft (1), and the conduit bearing (3) and the combined seal structure (4) are arranged in parallel between the conduit body (2) and the gearbox output shaft (1). A multi-layer contact seal structure sealing ring is installed on the conduit. The combined seal structure (4) includes a first oil slinger (40), a second oil slinger (41), two oil retaining rings (42), a first spacer ring (43), a contact seal O-ring (44), a conduit end cap (45), a second spacer ring (46), a bushing (47), a snap ring (48), a contact seal structure (49) and a small conduit end cap (50). The oil retaining ring (42) and the first spacer ring (43) are arranged on the side close to the gearbox output shaft (1) and are arranged in sequence along the direction away from the conduit bearing (3). A first oil return hole (421) is opened on the oil retaining ring (42), and a plurality of annular oil collecting grooves (11) and a second oil return hole (12) are opened on the output shaft (1). The first oil return hole (421), the oil collecting groove (11) and the second oil return hole (12) are correspondingly communicated. The first oil slinger (40), the second oil slinger (41), the second spacer ring (46) and the bushing (47) are arranged on the side close to the conduit body (2) and are arranged in sequence along the direction away from the conduit bearing (3). The contact seal O-ring (44) is installed on the conduit body (2) and there are multiple layers. The multiple layers of the contact seal O-ring (44) are respectively located between the conduit bearing (3) and the first oil slinger (40), between the first oil slinger (40) and the second oil slinger (41), and between the second oil slinger (41) and the second spacer ring (46). The spacer ring and the bushing (47) are axially fixed on the conduit by a snap ring (48), and the contact seal structure (49) is axially fixed by a small conduit end cap (50).

2. The semi-direct drive sealing structure according to claim 1, characterized in that: The oil retaining ring (42) and the first oil slinger (40) form a first labyrinth seal. The oil retaining ring (42), the conduit bearing (3) and the first oil slinger (40) enclose a first oil return cavity (402). The first oil return cavity communicates with the corresponding first oil return hole (421). The lubricating oil and oil mist in the first oil return cavity (402) flow back to the gearbox body through the corresponding first oil return hole (421), the oil collecting groove (11) and the second oil return hole (12).

3. The semi-direct drive sealing structure according to claim 2, characterized in that: The first oil slinger (40) is provided with a first concave oil collecting groove (401).

4. A semi-direct drive sealing structure according to any one of claims 1-3, characterized in that: The oil baffle ring (42) and the second oil slinger ring (41) form a second labyrinth seal. The two oil baffle rings (42) and the second oil slinger ring (41) enclose to form a second oil return cavity (412). The second oil return cavity (412) communicates with the corresponding first oil return hole (421). The lubricating oil and oil mist in the second oil return cavity (412) flow back into the gearbox body through the corresponding first oil return hole (421), the oil collecting groove (11), and the second oil return hole (12).

5. The semi-direct drive sealing structure according to claim 4, wherein: The second oil slinger ring (41) is provided with a second concave oil collecting groove (411).

6. A semi-direct drive sealing structure according to any one of claims 1-3, characterized in that: A third oil return cavity (431) is formed by enclosing the oil baffle ring (42), the first spacing ring (43), the second spacing ring (46), the bushing (47), and the cable gland end cover (45). The first spacing ring (43) is also provided with a first oil return hole (421). There are at least four first oil return holes (421) on most of the first spacing rings (43), and at least four first oil return holes (421) are evenly distributed along the circumference of the first spacing ring (43). The lubricating oil and oil mist in the third oil return cavity (431) flow back into the gearbox body through the first oil return hole (421) on the first spacing ring (43), the corresponding oil collecting groove (11), and the second oil return hole (12).

7. A semi-direct drive sealing structure according to claim 1, characterized in that: The contact seal O-ring (44) is also arranged between the cable gland end cover (45) and the output shaft (1). The contact seal structure (49) is arranged between the cable gland end cover (45), the bushing (47), and the cable gland small end cover (50).

8. The semi-direct drive sealing structure according to claim 7, characterized in that: The bushing (47) is the hardened bushing (47).

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