Sealing protection structure of wind power main shaft

Abstract

The invention discloses a wind power main shaft sealing protection structure, and relates to the field of wind power main shaft connecting device design, the wind power main shaft sealing protection structure comprises a wind power main shaft, a sealing connection unit, a sealing connection unit and a protection connection unit, the wind power main shaft is connected with a sealing protection shell through the sealing connection unit, and the sealing connection unit is arranged in the sealing protection shell; a sealing connecting unit is arranged in the sealing protective shell, a protective connecting unit is arranged at the position, beside the sealing connecting unit, in the sealing protective shell, the sealing connecting unit comprises a main shaft fixing shell, a clamping block, a connecting fixing plate, a fastening bolt and a fixing ring, a round hole is formed in the sealing protective shell, and the main shaft fixing shell is arranged in the round hole. When the wind power device is in an outdoor environment, the wind power main shaft can be protected, internal damage is prevented, cost is reduced, sealing performance of the device is improved, and service life of the device is prolonged.

Description

Technical Field

[0001] This invention relates to the field of wind turbine main shaft connection device design, and in particular to a wind turbine main shaft sealing and protection structure. Background Technology

[0002] Wind power equipment is the core device for generating electricity using wind energy. It consists of components such as blades, gearboxes, generators, control systems, and towers, and is used in both onshore and offshore wind power applications. The industry chain covers upstream component manufacturing (blades, main shaft bearings, tower flanges), midstream turbine assembly, and downstream operation and maintenance, forming a complete supply chain system. The world's first commercially deployed 18 MW wind turbine was tested and operated in Yingkou, Liaoning Province in 2024. It is equipped with a 260-meter rotor and 126-meter blades, and generates 74 million kWh of electricity per unit per year. Dongfang Electric's 26 MW semi-direct drive offshore turbine set a new world record for the largest single-unit capacity, with a hub center height of 185 meters, a rotor diameter of over 310 meters, and an annual power generation of 100 million kWh per unit. It can withstand a super typhoon of category 17. A floating wind power generation device tested in the Gobi Desert of Xinjiang reached an altitude of 1,500 meters in the stratosphere, with a rotor diameter of 40 meters, realizing high-altitude wind energy development.

[0003] Wind power generation refers to converting the kinetic energy of wind into electrical energy. Wind energy is a clean and pollution-free renewable energy source that has been utilized by humans for a long time, mainly through windmills for pumping water and grinding grain. People are more interested in how to use wind to generate electricity. Wind turbine bearings are a special type of bearing, used in harsh environments, with high maintenance costs and requiring a long lifespan. To improve performance, a sealed and protective structure for the wind turbine main shaft is needed.

[0004] Existing wind turbine main shaft sealing and protection structures have limitations. When the wind turbine equipment is in an open-air environment, the main shaft cannot be protected, which can easily lead to internal damage, increase costs, and reduce the lifespan of the equipment due to poor sealing. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a wind turbine main shaft sealing and protection structure. When the wind power equipment is in an open environment, the wind turbine main shaft can be protected to prevent internal damage, reduce costs, improve the sealing performance of the equipment, and extend the service life of the equipment. This can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wind turbine main shaft sealing and protection structure, comprising a wind turbine main shaft, a sealing connection unit, a sealing connection unit, and a protection connection unit:

[0007] Wind turbine main shaft: It is connected to the sealed protective shell through a sealed connection unit. The sealed protective shell is provided with a sealed connection unit, and a protective connection unit is provided next to the sealed connection unit inside the sealed protective shell.

[0008] Sealing connection unit: includes a spindle fixing shell, a snap-fit ​​block, a connecting fixing plate, fastening bolts, and a fixing ring. The sealing shell has a circular hole, and a spindle fixing shell is placed inside the circular hole. A fixing ring is fixedly sleeved on the outside of the spindle fixing shell. Multiple annular array limit grooves are provided on the outer surface of the sealing shell at the right side of the fixing ring. Each limit groove is fixedly snapped into the snap-fit ​​block by a pin. A connecting fixing plate is fixedly connected to each snap-fit ​​block. The sealing shell is positioned between the fixing ring and the connecting fixing plate. A fastening bolt is provided on each connecting fixing plate. Each fastening bolt passes through the sealing shell and the fixing ring in sequence and is connected to the corresponding nut.

[0009] The wind turbine main shaft is used to install a sealed protective shell, which is used for protection. The sealing connection unit is used to connect the wind turbine main shaft, the protective connection unit is used for protection, and the sealing connection unit is used for sealing protection. The main shaft fixing shell is used to fix the fixing ring, the snap-fit ​​block is used to fix the connecting fixing plate, and the connecting fixing plate is used to fix the fastening bolts. The fixing ring and the connecting fixing plate cooperate to connect with the sealed protective shell through the fastening bolts, thereby facilitating installation and use for protection and sealing protection.

[0010] Furthermore, the sealing connection unit also includes rotating balls, a connecting inner shell, and a connecting frame. An annular groove is formed on the inner surface of the main shaft fixing shell, and multiple rotating balls with equal spacing are arranged in the annular groove. An annular hole is formed on the inner ring of the main shaft fixing shell, and a connecting frame is rotatably connected in the annular hole. One end of the connecting frame is fixedly connected to the connecting inner shell. A ball fixing groove is formed on the connecting inner shell, and all the balls are arranged in the ball fixing groove.

[0011] The rotating ball bearings are used to make the wind turbine main shaft rotate more stably. The connecting inner shell is used to fix the rotating ball bearings to facilitate their movement. The connecting bracket is used to fix the rotating inner ring for the installation of the wind turbine main shaft.

[0012] Furthermore, the sealing connection unit also includes a rotating inner ring, and the other end of the connecting frame is fixedly connected to a rotating inner ring, which is connected to the wind turbine main shaft.

[0013] The rotating inner ring is used to connect the wind turbine main shaft for installation and use.

[0014] Furthermore, the sealing connection unit also includes a protective shell sealing strip, and the protective shell sealing strip is provided on the main shaft fixing shell at the connection of the sealing protective shell.

[0015] The sealing strip of the protective shell is used to make the seal of the protective shell more stable, thereby achieving the sealing effect.

[0016] Furthermore, the sealing connection unit includes connecting blocks, a sealing protective plate, and stabilizing balls. A sealing protective plate is provided on the inner surface of the sealing protective shell, and four connecting blocks in a ring array are provided on the sealing protective plate. Each connecting block is fixedly connected to the sealing protective shell by bolts. A circular hole is provided on the sealing protective shell, and a limiting circular groove is provided in the circular hole. Multiple stabilizing balls with equal spacing are provided in the limiting circular groove.

[0017] The connecting block is used to fix the sealing and protective plate, which in turn fixes the stabilizing ball bearings. The stabilizing ball bearings are used to make the rotation more stable, thus making the installation and use more stable.

[0018] Furthermore, the sealing connection unit also includes a ball bearing retainer, a snap-fit ​​ring, and a wind turbine main shaft connecting plate. Each stabilizing ball bearing is provided with a ball bearing retainer, and a snap-fit ​​ring is fixedly connected to all the ball bearing retainers. The snap-fit ​​ring is provided with a wind turbine main shaft connecting plate, and the wind turbine main shaft connecting plate is connected to the wind turbine main shaft by bolts.

[0019] The ball bearing retainer is used to fix and stabilize the ball bearings, and the snap-fit ​​ring is used to fix the wind turbine main shaft connecting plate. The wind turbine main shaft connecting plate is used to install the wind turbine main shaft for fixing the wind turbine main shaft.

[0020] Furthermore, the sealing connection unit also includes an external connecting ring and sealant. An external connecting ring is provided on the outer surface of the sealing protective shell. The external connecting ring is connected to the external wind turbine body by bolts. Sealant is provided on the sealing protective shell at the connection point of the wind turbine body.

[0021] The external connecting ring is used for external connections and installation, while the sealant is used for sealing, thus providing protection and fixation.

[0022] Furthermore, the protective connection unit includes a support connection block, a connection damper, and a rectangular connection plate. The inner surface of the sealed protective shell is provided with four support connection blocks arranged in a ring array on the left side of the sealed protective plate. Each support connection block is provided with a connection damper, and each connection damper is fixedly connected to the corresponding rectangular connection plate.

[0023] The support connecting block is used to fix the connecting damper, and the connecting damper is used for support to make the fixation more stable. The rectangular connecting plate is used to fix the support connecting frame, and thus they are assembled and used to make the installation more stable.

[0024] Furthermore, the protective connection unit also includes a support connection frame and a fixed bearing. The wind turbine main shaft is fixedly sleeved with the fixed bearing, and the fixed bearing is provided with four support connection frames, each of which is fixedly connected to a corresponding rectangular connection plate.

[0025] The support frame is used to fix the fixed bearing, which is used to fix the wind turbine main shaft, so as to facilitate the rotation of the wind turbine main shaft and facilitate connection and use.

[0026] Furthermore, the protective connection unit also includes an arc-shaped connection plate, which is provided on the fixed bearing and is fixedly connected to the wind turbine main shaft by bolts.

[0027] The curved connecting plate facilitates disassembly and assembly, makes the fixing more stable, and makes installation and use easier.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. This wind turbine main shaft sealing and protection structure has the following advantages: It is equipped with a sealing connection unit, through which the main shaft fixing shell is used to fix the fixing ring, the snap-fit ​​block is used to fix the connecting fixing plate, the connecting fixing plate is used to fix the fastening bolts, the fixing ring and the connecting fixing plate cooperate to connect with the sealing and protective shell through the fastening bolts, the rotating ball is used to make the rotation of the wind turbine main shaft more stable, the connecting inner shell is used to fix the rotating ball to facilitate the movement of the rotating ball, the connecting bracket is used to fix the rotating inner ring, the rotating inner ring is used to connect to the wind turbine main shaft, and the protective shell sealing strip is used to make the sealing and protective shell more stable for connection use;

[0030] 2. This wind turbine main shaft sealing and protection structure has the following advantages: It is equipped with a sealing connection unit, through which a connecting block is used to fix the sealing and protection plate, the sealing and protection plate is used to fix the stabilizing ball bearings, the stabilizing ball bearings are used to make the rotation more stable, the ball bearing fixing seat is used to fix the stabilizing ball bearings, the snap-fit ​​ring is used to fix the wind turbine main shaft connecting plate, the wind turbine main shaft connecting plate is used to install the wind turbine main shaft, the external connecting ring is used for external connection, and the sealant is used for sealing and protection.

[0031] 3. The sealing and protection structure of this wind turbine main shaft has the following advantages: When the wind power equipment is in an open-air environment, the wind turbine main shaft can be protected to prevent internal damage, reduce costs, improve the sealing performance of the equipment, and extend the service life of the equipment. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the front structure of the present invention;

[0033] Figure 2 This is a side view of the present invention;

[0034] Figure 3 This is a schematic diagram of the side structure of the sealing connection unit of the present invention;

[0035] Figure 4 This is a schematic diagram of the back structure of the sealing connection unit of the present invention;

[0036] Figure 5 This is a partial cross-sectional view of the sealing and protective plate of the present invention;

[0037] Figure 6 This is the present invention. Figure 5 A magnified view of the structure at point A in the middle;

[0038] Figure 7 This is a partial structural diagram of the protective connection unit of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1 Wind turbine main shaft, 2 Sealed protective shell, 3 Sealed connection unit, 31 Main shaft fixing shell, 32 Clip-on block, 33 Connecting fixing plate, 34 Fastening bolt, 35 Fixing ring, 36 Protective shell sealing strip, 37 Rotating ball, 38 Connecting inner shell, 39 Connecting frame, 310 Rotating inner ring, 4 Sealed connection unit, 41 Connecting block, 42 ​​Sealed protective plate, 43 Stabilizing ball, 44 Ball fixing seat, 45 Clip-on ring, 46 Wind turbine main shaft connecting plate, 47 External connecting ring, 48 Sealing adhesive, 5 Protective connection unit, 51 Support connecting block, 52 Connecting damper, 53 Rectangular connecting plate, 54 Support connecting frame, 55 Fixed bearing, 56 Arc-shaped connecting plate. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figure 1-7 This embodiment provides a technical solution: a wind turbine main shaft sealing and protection structure, including a wind turbine main shaft 1, a sealing connection unit 3, a sealing connection unit 4, and a protection connection unit 5.

[0043] Wind turbine main shaft 1: It is connected to the sealing protective shell 2 through the sealing connection unit 3. The sealing protective shell 2 is provided with a sealing connection unit 4. The sealing protective shell 2 is provided with a protective connection unit 5 located next to the sealing connection unit 4.

[0044] Sealing connection unit 3: includes a spindle fixing shell 31, a snap-fit ​​block 32, a connecting fixing plate 33, fastening bolts 34, and a fixing ring 35. The sealing protective shell 2 is provided with a circular hole, and a spindle fixing shell 31 is provided in the circular hole. A fixing ring 35 is fixedly sleeved on the outside of the spindle fixing shell 31. Multiple annular array limit grooves are provided on the outer surface of the sealing protective shell 2 at the position to the right of the fixing ring 35. Each limit groove is fixedly snapped into the snap-fit ​​block 32 by a pin. A connecting fixing plate 33 is fixedly connected to each snap-fit ​​block 32. The sealing protective shell 2 is located between the fixing ring 35 and the connecting fixing plate 33. A fastening bolt 34 is provided on each connecting fixing plate 33. Each fastening bolt 34 passes through the sealing protective shell 2 and the fixing ring 35 in sequence and is connected to the corresponding nut.

[0045] The wind turbine main shaft 1 is used to install the sealing protective shell 2, which is used for protection. The sealing connection unit 3 is used to connect the wind turbine main shaft 1. The protective connection unit 5 is used for protection. The sealing connection unit 4 is used for sealing protection. The main shaft fixing shell 31 is used to fix the fixing ring 35. The snap-fit ​​block 32 is used to fix the connecting fixing plate 33. The connecting fixing plate 33 is used to fix the fastening bolt 34. The fixing ring 35 and the connecting fixing plate 33 cooperate to connect with the sealing protective shell 2 through the fastening bolt 34, thereby facilitating installation and use for protection and sealing protection.

[0046] The sealing connection unit 3 also includes rotating balls 37, a connecting inner shell 38, and a connecting frame 39. An annular groove is provided on the inner surface of the main shaft fixing shell 31, and multiple rotating balls 37 with equal spacing are provided in the annular groove. An annular hole is provided on the inner ring of the main shaft fixing shell 31, and a connecting frame 39 is rotatably connected in the annular hole. One end of the connecting frame 39 is fixedly connected to the connecting inner shell 38. A ball fixing groove is provided on the connecting inner shell 38, and all the balls are set in the ball fixing groove.

[0047] The rotating ball bearing 37 is used to make the rotation of the wind turbine main shaft 1 more stable. The connecting inner shell 38 is used to fix the rotating ball bearing 37 to facilitate the movement of the rotating ball bearing 37. The connecting bracket 39 is used to fix the rotating inner ring 310 for the installation of the wind turbine main shaft 1.

[0048] The sealing connection unit 3 also includes a rotating inner ring 310. The other end of the connecting frame 39 is fixedly connected to a rotating inner ring 310, and the rotating inner ring 310 is connected to the wind turbine main shaft 1.

[0049] The rotating inner ring 310 is used to connect the wind turbine main shaft 1 for installation and use.

[0050] The sealing connection unit 3 also includes a protective shell sealing strip 36, which is provided on the main shaft fixing shell 31 at the connection of the sealing protective shell 2.

[0051] The protective shell sealing strip 36 is used to make the sealing of the protective shell 2 more stable, thereby achieving the sealing function.

[0052] The sealing connection unit 4 includes a connecting block 41, a sealing protective plate 42, and stabilizing balls 43. A sealing protective plate 42 is provided on the inner surface of the sealing protective shell 2. Four connecting blocks 41 in an annular array are provided on the sealing protective plate 42. Each connecting block 41 is fixedly connected to the sealing protective shell 2 by bolts. A circular hole is provided on the sealing protective shell 2. A limiting circular groove is provided in the circular hole. Multiple stabilizing balls 43 with equal spacing are provided in the limiting circular groove.

[0053] The connecting block 41 is used to fix the sealing and protective plate 42, the sealing and protective plate 42 is used to fix the stabilizing ball 43, and the stabilizing ball 43 is used to make the rotation more stable. Thus, the installation and use are carried out to make the fixation more stable.

[0054] The sealing connection unit 4 also includes a ball bearing retainer 44, a snap-fit ​​ring 45, and a wind turbine main shaft connecting plate 46. Each stabilizing ball 43 is provided with a ball bearing retainer 44, and a snap-fit ​​ring 45 is fixedly connected to all the ball bearing retainers 44. The snap-fit ​​ring 45 is provided with a wind turbine main shaft connecting plate 46, and the wind turbine main shaft connecting plate 46 is connected to the wind turbine main shaft 1 by bolts.

[0055] The ball bearing retainer 44 is used to fix the stabilizing ball bearing 43, and the snap ring 45 is used to fix the wind turbine main shaft connecting plate 46. The wind turbine main shaft connecting plate 46 is used to install the wind turbine main shaft 1 to fix the wind turbine main shaft 1.

[0056] The sealing connection unit 4 also includes an external connecting ring 47 and a sealant 48. An external connecting ring 47 is provided on the outer surface of the sealing protective shell 2. The external connecting ring 47 is connected to the external wind power main body by bolts. The sealant 48 is provided on the sealing protective shell 2 at the connection point of the wind power main body.

[0057] The external connecting ring 47 is used for external connection and installation, and the sealant 48 is used for sealing and protection.

[0058] The protective connection unit 5 includes a support connection block 51, a connection damper 52, and a rectangular connection plate 53. Four support connection blocks 51 in an annular array are arranged on the inner surface of the sealed protective shell 2 at the position to the left of the sealed protective plate 42. Each support connection block 51 is provided with a connection damper 52, and each connection damper 52 is fixedly connected to the corresponding rectangular connection plate 53.

[0059] The support connecting block 51 is used to fix the connecting damper 52, and the connecting damper 52 is used for support to make the fixation more stable. The rectangular connecting plate 53 is used to fix the support connecting frame 54, and thus they are assembled and used to make the installation more stable.

[0060] The protective connection unit 5 also includes a support connection frame 54 and a fixed bearing 55. The wind turbine main shaft 1 is fixedly connected to the fixed bearing 55. The fixed bearing 55 is provided with four support connection frames 54, and each support connection frame 54 is fixedly connected to the corresponding rectangular connection plate 53.

[0061] The support frame 54 is used to fix the fixed bearing 55, and the fixed bearing 55 is used to fix the wind turbine main shaft 1, so as to facilitate the rotation of the wind turbine main shaft 1 and facilitate connection and use.

[0062] The protective connection unit 5 also includes an arc-shaped connection plate 56. The arc-shaped connection plate 56 is provided on the fixed bearing 55 and is fixedly connected to the wind turbine main shaft 1 by bolts.

[0063] The curved connecting plate 56 is designed for easy disassembly and assembly, making the fixation more stable and facilitating installation and use.

[0064] The working principle of the wind turbine main shaft sealing and protection structure provided by this invention is as follows: First, the main shaft fixing shell 31 is used to fix the fixing ring 35, the snap-fit ​​block 32 is used to fix the connecting fixing plate 33, the connecting fixing plate 33 is used to fix the fastening bolt 34, the fixing ring 35 and the connecting fixing plate 33 cooperate to connect with the sealing and protection shell 2 through the fastening bolt 34, the rotating ball 37 is used to make the rotation of the wind turbine main shaft 1 more stable, the connecting inner shell 38 is used to fix the rotating ball 37 to facilitate the movement of the rotating ball 37, the connecting bracket 39 is used to fix the rotating inner ring 310, the rotating inner ring 310 is used to connect the wind turbine main shaft 1, the protective shell sealing strip 36 is used to make the sealing and protection shell 2 more stable, so that the sealing and protection shell 2 is connected to the wind turbine main shaft 1, and at the same time, the connecting block 41 is used to fix the sealing and protection shell 2. The protective plate 42 and the sealing protective plate 42 are used to fix the stabilizing ball 43, which makes the rotation more stable. The ball fixing seat 44 is used to fix the stabilizing ball 43. The snap ring 45 is used to fix the wind turbine main shaft connecting plate 46, which is used to install the wind turbine main shaft 1. The external connecting ring 47 is used for external connection and installation. The sealant 48 is used for sealing and connection. The supporting connecting block 51 is used to fix the connecting damper 52, which is used for support and makes the fixation more stable. The rectangular connecting plate 53 is used to fix the supporting connecting frame 54, which is used to fix the fixed bearing 55. The fixed bearing 55 is used to fix the wind turbine main shaft 1. The arc-shaped connecting plate 56 is used for easy disassembly and assembly and for protection.

[0065] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A wind turbine main shaft sealing and protection structure, comprising a wind turbine main shaft (1), a sealing connection unit (3), a sealing connection unit (4), and a protection connection unit (5), characterized in that: Wind turbine main shaft (1): It is connected to the sealing protective shell (2) through a sealing connection unit (3). The sealing protective shell (2) is provided with a sealing connection unit (4). The sealing protective shell (2) is provided with a protective connection unit (5) located next to the sealing connection unit (4). Sealing connection unit (3): includes a spindle fixing shell (31), a snap-fit ​​block (32), a connecting fixing plate (33), a fastening bolt (34) and a fixing ring (35). The sealing protective shell (2) is provided with a circular hole, and a spindle fixing shell (31) is provided in the circular hole. A fixing ring (35) is fixedly sleeved on the outside of the spindle fixing shell (31). Multiple annular array limiting grooves are provided on the outer surface of the sealing protective shell (2) at the position to the right of the fixing ring (35). Each limiting groove is fixedly snapped to the snap-fit ​​block (32) by a pin. A connecting fixing plate (33) is fixedly connected to each snap-fit ​​block (32). The sealing protective shell (2) is located between the fixing ring (35) and the connecting fixing plate (33). A fastening bolt (34) is provided on each connecting fixing plate (33). Each fastening bolt (34) passes through the sealing protective shell (2) and the fixing ring (35) in sequence and is connected to the corresponding nut.

2. The wind turbine main shaft sealing and protection structure according to claim 1, characterized in that: The sealing connection unit (3) also includes rotating balls (37), connecting inner shell (38) and connecting frame (39). The inner surface of the main shaft fixing shell (31) is provided with an annular groove, and multiple rotating balls (37) with equal spacing are provided in the annular groove. The inner ring of the main shaft fixing shell (31) is provided with an annular hole, and a connecting frame (39) is rotatably connected in the annular hole. One end of the connecting frame (39) is fixedly connected to the connecting inner shell (38). The connecting inner shell (38) is provided with a ball fixing groove, and all the balls are set in the ball fixing groove.

3. The wind turbine main shaft sealing and protection structure according to claim 2, characterized in that: The sealing connection unit (3) also includes a rotating inner ring (310), and the other end of the connecting frame (39) is fixedly connected to a rotating inner ring (310), which is connected to the wind turbine main shaft (1).

4. The wind turbine main shaft sealing and protection structure according to claim 1, characterized in that: The sealing connection unit (3) also includes a protective shell sealing strip (36), and the main shaft fixing shell (31) is provided with a protective shell sealing strip (36) at the connection of the sealing protective shell (2).

5. The wind turbine main shaft sealing and protection structure according to claim 1, characterized in that: The sealing connection unit (4) includes a connecting block (41), a sealing protection plate (42), and stabilizing balls (43). A sealing protection plate (42) is provided on the inner surface of the sealing protection shell (2). Four connecting blocks (41) in a ring array are provided on the sealing protection plate (42). Each connecting block (41) is fixedly connected to the sealing protection shell (2) by bolts. A circular hole is provided on the sealing protection shell (2). A limiting circular groove is provided in the circular hole. Multiple stabilizing balls (43) with equal spacing are provided in the limiting circular groove.

6. The wind turbine main shaft sealing and protection structure according to claim 5, characterized in that: The sealing connection unit (4) also includes a ball bearing retainer (44), a snap ring (45), and a wind turbine main shaft connecting plate (46). Each stabilizing ball (43) is provided with a ball bearing retainer (44), and a snap ring (45) is fixedly connected to all the ball bearing retainers (44). The snap ring (45) is provided with a wind turbine main shaft connecting plate (46), and the wind turbine main shaft connecting plate (46) is connected to the wind turbine main shaft (1) by bolts.

7. The wind turbine main shaft sealing and protection structure according to claim 5, characterized in that: The sealing connection unit (4) also includes an external connecting ring (47) and sealant (48). An external connecting ring (47) is provided on the outer surface of the sealing protective shell (2). The external connecting ring (47) is connected to the external wind power body by bolts. Sealant (48) is provided on the sealing protective shell (2) at the connection point of the wind power body.

8. The wind turbine main shaft sealing and protection structure according to claim 5, characterized in that: The protective connection unit (5) includes a support connection block (51), a connection damper (52) and a rectangular connection plate (53). The inner surface of the sealed protective shell (2) is provided with four ring array support connection blocks (51) located on the left side of the sealed protective plate (42). Each support connection block (51) is provided with a connection damper (52), and each connection damper (52) is fixedly connected to the corresponding rectangular connection plate (53).

9. The wind turbine main shaft sealing and protection structure according to claim 8, characterized in that: The protective connection unit (5) also includes a support connection frame (54) and a fixed bearing (55). The wind turbine main shaft (1) is fixedly connected to the fixed bearing (55). The fixed bearing (55) is provided with four support connection frames (54), and each support connection frame (54) is fixedly connected to the corresponding rectangular connection plate (53).

10. A wind turbine main shaft sealing and protection structure according to claim 9, characterized in that: The protective connection unit (5) also includes an arc-shaped connection plate (56), which is provided on the fixed bearing (55). The arc-shaped connection plate (56) is fixedly connected to the wind turbine main shaft (1) by bolts.

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