Wind driven generator bolt protective cap and using method thereof

Abstract

The invention discloses a wind driven generator bolt protective cap and a using method thereof.The wind driven generator bolt protective cap comprises a screwing body, a containing cavity is formed in the bottom of the screwing body, a threaded blind hole is formed in the portion, located on the top of the containing cavity, in the screwing body, a screwing structure is arranged outside the screwing body, a grease storage cavity is formed in the top of the screwing body, and a sliding plug is installed in the grease storage cavity; a ring groove is formed in the bottom of the screwing body, a first flow channel is formed in the screwing body, one end of the first flow channel communicates with the lower side of the grease storage cavity, and the other end of the first flow channel communicates with one side of the ring groove; in the using state, a gap exists between the inner side wall of the ring groove and the flange at the lower end of the screwing body. The sealant in the grease storage cavity is filled in advance and is directly used during installation, so that when the protective cap is installed, no additional oil injection equipment is needed for oil injection, the operation is simpler, and the installation efficiency of the protective cap is improved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, and in particular to a wind turbine bolt protective cap and its usage method. Background Technology

[0002] Anchor bolts for wind turbines are used to secure the base flange of the wind turbine tower to the foundation, ensuring the stability of the wind turbine during operation. To prevent corrosion of the anchor bolts and the nuts attached to them, protective caps are typically installed on the anchor bolts.

[0003] For example, Chinese patent document CN206522333U, published on September 26, 2017, discloses a protective cap for exposed bolts of a wind turbine generator set. The cap includes a housing for covering the exposed bolts of the wind turbine generator set; the housing comprises an upper housing and a lower housing that are internally connected; the upper housing has threads for engaging with the exposed bolts; the lower housing has a trapezoidal outer contour in its longitudinal section. Its advantages are: it effectively protects the exposed bolts of the wind turbine generator set, preventing erosion of the exposed bolts in windy and sandy environments or coastal rainwater, thus avoiding damage to the galvanized layer and the safety hazards caused by rust and bolt breakage; its disadvantage is: during use, water can enter the housing from the gaps at the bottom, causing moisture inside the housing and leading to bolt corrosion.

[0004] For example, Chinese patent document CN223049182U, published on July 1, 2025, discloses a novel bolt protective cap, including a cap body. The cap body has a communicating receiving cavity and an opening. A first mounting groove is formed on the side of the cap body near the opening, and a sealing ring is installed in the first mounting groove. A second mounting groove is formed on one side of the first mounting groove, and a magnet is installed in the second mounting groove. Its advantages are: by forming the first and second mounting grooves at the opening of the cap body, and installing the sealing ring and magnet in the first and second mounting grooves respectively, the magnet magnetically attracts the flange surface, and the sealing ring seals the gap between the cap body and the flange surface. The installation method is simple, and the magnetic attraction design prevents detachment, making the bolt assembly less prone to corrosion. Its disadvantage is: the magnetic attraction between the cap body and the flange surface is relatively weak, posing a risk of loss.

[0005] For example, Chinese patent document CN221704170U, published on September 13, 2024, discloses a protective sleeve for large-diameter bolts of a wind turbine tower. The protective sleeve is a sleeve structure with one end open and the other end closed. From the open end to the closed end, there are a protective sleeve and a protective cap. The protective sleeve is a cylindrical structure. The protective cap located above the protective sleeve is a structure with a cylindrical lower part and a spherical top. The top end of the protective sleeve and the bottom end of the protective cap are in contact, and the outer diameter of the connection is the same. Its advantages include: preventing the entry of moisture and corrosive gases, separating moisture from bolts and nuts, effectively preventing corrosion of bolts and nuts, greatly mitigating corrosion, effectively extending the service life of bolts and nuts, and ensuring normal power generation; its disadvantages include: while oil injection can achieve a waterproof effect and the protective cap is tightened onto the bolt with high security, it requires oiling through a small injection hole, and requires separate oiling equipment to inject oil one by one, making the operation complex and the installation efficiency low. Furthermore, existing protective caps only address protection and rust prevention, not preventing nut loosening. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a protective cap for wind turbine bolts, which at least solves the problem that the existing technology requires oiling equipment, which is complicated to operate and has low installation efficiency.

[0007] Another technical problem to be solved by the present invention is to provide a method for using a protective cap for a wind turbine bolt.

[0008] To achieve the above objectives, this application provides a wind turbine bolt protection cap, including a screwing body. The bottom of the screwing body has a receiving cavity, and a threaded blind hole is provided at the top of the receiving cavity within the screwing body. A screwing structure is provided on the outside of the screwing body. A grease reservoir is provided at the top of the screwing body, and a sliding plug is installed inside the grease reservoir. The grease reservoir is located below the sliding plug and is used to store sealant. An annular groove is provided at the bottom of the screwing body, and a first flow channel is provided inside the screwing body. One end of the first flow channel connects to the lower side of the grease reservoir, and the other end connects to one side of the annular groove. In use, there is a gap between the lower end of the screwing body located on the inner wall of the annular groove and the flange.

[0009] The rotating body is also provided with a second flow channel. One end of the second flow channel is connected to the upper side of the grease storage cavity, and the other end is connected to the other side of the annular groove. The positions of the first flow channel and the second flow channel connected to the annular groove are opposite. When the sliding plug is in the highest position, the sliding plug closes the second flow channel at one end of the grease storage cavity.

[0010] The end of the inner wall of the annular groove is lower than the end of the outer wall, so that an annular gap is formed between the end of the inner wall of the annular groove and the flange.

[0011] Multiple helical teeth are evenly distributed at the end of the inner sidewall of the annular groove. The ends of the helical teeth extend a certain distance beyond the end of the outer sidewall of the annular groove, and the roots of the helical teeth are a certain distance below the end of the inner sidewall of the annular groove, so that a gap is formed between the roots of the helical teeth and the flange.

[0012] Multiple protrusions are provided on the step at the top of the receiving cavity.

[0013] The protrusion has a triangular pyramid structure with one end higher than the other, and the central axis of the triangular pyramid structure is an arc concentric with the threaded blind hole. When the screwing body is rotated clockwise during installation, the lower end of the protrusion is located at the front end, and the higher end is located at the rear end.

[0014] A pressure post is provided on the top of the slider.

[0015] An end cap is fixedly installed on the top of the grease storage chamber. A through hole is provided in the middle of the end cap. When the sliding plug is in the highest position, the pressure column passes through the through hole.

[0016] The end cap through hole is provided with an internal thread, the lower end of the pressure column is provided with an external thread, the external thread and the internal thread are screwed together, and the top of the pressure column is provided with a rotation drive part.

[0017] The method of using the aforementioned wind turbine bolt protective cap includes the following steps: S1. The grease reservoir of the wind turbine bolt protective cap is pre-filled with sealant; S2. Install the wind turbine bolt protective cap onto the anchor bolt. During installation, rotate the screwing body until the protrusion abuts against the flange. S3. Secure the tool to the screwing mechanism and further drive the screwing body to rotate until the end of the outer wall of the annular groove abuts against the flange. At this point, the end of the helical tooth is embedded in the flange, and the protruding end is embedded in the top surface of the nut. S4. Press down the sliding plug to squeeze the sealant in the grease reservoir. The sealant enters the annular groove through the first flow channel, sealing the bottom of the screwing body with the flange. S5. Further press down the sliding plug, and the sealant in the ring groove enters the receiving cavity from the gap.

[0018] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: 1. The receiving cavity of this invention is used to receive the nut on the anchor bolt, the threaded blind hole is used for installation onto the upper end of the anchor bolt, and the grease reservoir is located below the sliding plug to store sealant. When the tightening body is installed onto the anchor bolt, and then the sliding plug is pressed down, the sealant in the grease reservoir enters the annular groove from the first flow channel, sealing the tightening body with the flange. Upon further pressing down, the sealant enters the receiving cavity from the gap. The sealant in the grease reservoir is pre-filled and can be used directly during installation, thus eliminating the need for additional lubrication equipment when installing the protective cap, simplifying the operation and improving the installation efficiency of the protective cap.

[0019] 2. The helical teeth of this invention have a triangular structure, with the root of the helical teeth located at the front end and the tip, i.e., the highest point, located at the rear end. This facilitates tightening when the screwing body is turned clockwise. However, after tightening, the tip of the helical teeth embeds into the flange, greatly increasing the resistance to the reverse rotation of the screwing body. Multiple protrusions are provided on the step at the top of the receiving cavity. During tightening, the tips of the protrusions embed into the top of the nut, limiting the nut's position and thus preventing the protective cap from loosening. Simultaneously, the protective cap also functions as the nut.

[0020] 3. An end cap is fixedly installed on the top of the grease storage cavity of the present invention. A through hole is provided in the middle of the end cap. When the sliding plug is in the highest position, the pressure column passes through the through hole. The end cap is provided to prevent the sliding plug from falling out of the grease storage cavity. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0022] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure when the present invention is installed on an anchor bolt.

[0024] Figure 3 This is a schematic diagram illustrating how the present invention is installed on an anchor bolt, and how the sliding plug is squeezed to form a seal with the sealant.

[0025] Figure 4 This is a three-dimensional structural diagram of the present invention.

[0026] Figure 5 This is a three-dimensional structural diagram of the slide plug in this invention.

[0027] Figure 6 This is a schematic diagram showing the oblique teeth at the bottom of the rotating body extending a certain distance in this invention.

[0028] Figure 7 This is a schematic diagram of the inclined teeth at the bottom of the rotating body and the protrusions on the step in this invention.

[0029] Figure Labels Flange 1, Anchor bolt 2, Nut 3, Sealant 4; Tightening body 10, receiving cavity 11, threaded blind hole 12, step 13, protrusion 14, grease reservoir 15, annular groove 16, gap 161, helical tooth 162, first flow channel 17, second flow channel 18, and tightening structure 19. 20, 21, 22, 23, 20; End cap 30, internal thread 31. Detailed Implementation

[0030] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0031] Regarding the explanation of terminology: In this application, "and / or" is used to describe the relationship between related objects, covering three possible situations: taking "A and / or B" as an example, it can indicate the situation where only A exists, A and B exist simultaneously, or only B exists; the symbol " / " indicates the "or" relationship between related objects, such as "A / B" which refers to A or B.

[0032] Regarding the description of the embodiments: The terms "exemplary" and "for example" appearing in this application are only used to illustrate the technical solutions through specific examples. It should be particularly emphasized that any implementation method or design scheme marked as "exemplary" or "for example" should not be construed as having an advantage over other solutions. Such expressions are only used to present the technical concepts more intuitively.

[0033] Example 1: See Figure 1-7 This embodiment provides a wind turbine bolt protection cap, including a screwing body 10. The bottom of the screwing body 10 is provided with a receiving cavity 11. The screwing body 10 is provided with a threaded blind hole 12 located at the top of the receiving cavity 11. The screwing body 10 is provided with a screwing structure 19 on the outside. The top of the screwing body 10 is provided with a grease reservoir 15. A sliding plug 20 is installed in the grease reservoir 15. The grease reservoir 15 is located below the sliding plug 20 and is used to store sealant 4. The bottom of the screwing body 10 is provided with an annular groove 16. The screwing body 10 is provided with a first flow channel 17. One end of the first flow channel 17 is connected to the lower side of the grease reservoir 15, and the other end is connected to one side of the annular groove 16. In use, there is a gap 161 between the lower end of the screwing body 10 located on the inner wall of the annular groove 16 and the flange 1.

[0034] The receiving cavity 11 is used to receive the nut 3 on the anchor bolt 2, the threaded blind hole 12 is used for installation onto the upper end of the anchor bolt 2, and the grease reservoir 15, located below the slide plug 20, is used to store the sealant 4. When the tightening body 10 is installed onto the anchor bolt 2, as... Figure 2 As shown, then press down the sliding plug 20, as... Figure 3 As shown, the sealant 4 in the grease reservoir 15 enters the annular groove 16 through the first flow channel 17, sealing the screwing body 10 with the flange 1. Upon further pressure, the sealant 4 enters the receiving cavity 11 through the gap 161. The sealant 4 in the grease reservoir 15 is pre-filled and can be used directly during installation, thus eliminating the need for additional lubrication equipment when installing the protective cap, simplifying the operation and improving the installation efficiency of the protective cap.

[0035] In this embodiment, the sealant 4 can be silicone sealant or rust-preventive grease. When applied, any gel or grease that can achieve sealing and / or rust prevention can be used as sealant 4.

[0036] Further, see Figure 1 The rotating body 10 also has a second flow channel 18. One end of the second flow channel 18 connects to the upper side of the grease reservoir 15, and the other end connects to the other side of the annular groove 16. The positions of the first flow channel 17 and the second flow channel 18 connecting to the annular groove 16 are opposite. When the sliding plug 20 is in the highest position, the sliding plug 20 closes the end of the second flow channel 18 located in the grease reservoir 15. By setting the second flow channel 18, the efficiency of the sealant 4 entering and exiting is further improved. Figure 1 When the slide plug 20 is in its highest position, it closes one end of the second flow channel 18 located in the grease reservoir 15. When the slide plug 20 is pressed down, the sealant 4 enters the annular groove 16 from the first flow channel 17, while the second flow channel 18 is located at the other end of the annular groove 16, and the air in the annular groove 16 is discharged from the second flow channel 18. This allows the sealant 4 to quickly enter the annular groove 16.

[0037] In this embodiment, the diameter of the second flow channel 18 is smaller than the diameter of the first flow channel 17. When the slide plug 20 is pressed quickly, the sealant 4 first fills the entire annular groove 16, then a small portion of the sealant 4 enters the second flow channel 18, and most of the sealant 4 enters the receiving cavity 11 from the gap 161.

[0038] In this embodiment, see Figure 1 The end of the inner wall of the annular groove 16 is lower than the end of the outer wall, so that an annular gap 161 is formed between the end of the inner wall of the annular groove 16 and the flange 1.

[0039] In this embodiment, the end of the inner sidewall of the annular groove 16 is 0.1~0.5mm lower than the end of the outer sidewall.

[0040] Example 2: The difference between this embodiment and Embodiment 1 is that, see [link to Embodiment 1] Figure 6 , 7 Multiple helical teeth 162 are evenly distributed at the end of the inner sidewall of the annular groove 16. The ends of the helical teeth 162 extend a certain distance beyond the end of the outer sidewall of the annular groove 16, and the roots of the helical teeth 162 are a certain distance below the end of the inner sidewall of the annular groove 16, so that a gap 161 is formed between the roots of the helical teeth 162 and the flange 1. During installation, the ends of the helical teeth 162 are embedded in the flange 1 to prevent the screwing body 10 from loosening by reverse rotation. The helical teeth 162 have a triangular structure, with the roots of the helical teeth 162 located at the front end and the ends of the helical teeth 162, i.e., the highest point, located at the rear end. This facilitates tightening the screwing body 10 clockwise, but after tightening, the ends or tips of the helical teeth 162 are embedded in the flange 1, which greatly increases the resistance to reverse rotation of the screwing body 10.

[0041] In this embodiment, the end of the helical tooth 162 extends 0.1-0.3 mm beyond the end of the outer wall of the annular groove 16, and the root of the helical tooth 162 is 0.1-0.3 mm below the end of the inner wall of the annular groove 16.

[0042] Furthermore, to prevent the nut 3 within the receiving cavity 11 from loosening, see [reference needed]. Figure 7 Multiple protrusions 14 are provided on the step 13 at the top of the receiving cavity 11.

[0043] Specifically, the protrusion 14 is a triangular pyramid structure with one end higher than the other, and the central axis of the triangular pyramid structure is an arc concentric with the threaded blind hole 12. When the screwing body 10 is rotated clockwise during installation, the lower end of the protrusion 14 is located at the front end, and the higher end is located at the rear end.

[0044] Because the lower end of the protrusion 14 is located at the front end and the higher end is located at the rear end, it is easy to tighten the screwing body 10 clockwise. During the tightening process, the highest point of the protrusion 14 is embedded in the top of the nut 3, limiting the nut 3 and thus preventing the protective cap from loosening. At the same time, the protective cap also functions as a nut.

[0045] Example 3: Based on Example 1 or Example 2, see Figure 1 The top of the slider 20 is provided with a pressure post 21 to facilitate pressing the slider 20.

[0046] Furthermore, an end cap 30 is fixedly installed on the top of the grease storage chamber 15. The end cap 30 has a through hole in its center. When the sliding plug 20 is in its highest position, the pressure pin 21 protrudes through the through hole. The end cap 30 prevents the sliding plug 20 from falling out of the grease storage chamber 15. In this embodiment, the end cap 30 is threaded onto the rotating body 10, or pressed in with an interference fit, or welded. The sliding plug 20 is slidably and sealingly connected to the grease storage chamber 1. See Figure 1 ,5 The end cap 30 has an internal thread 31 on the lower side of the through hole, and the pressure column 21 has an external thread 22 at its lower end. The external thread 22 is screwed into the internal thread 31, and the pressure column 21 has a rotation drive part 23 on its top. During production, the external thread 22 is screwed into the internal thread 31 to prevent the pressure column 21 from being squeezed during transportation when it is not in use, which would cause the sealant 4 to be squeezed out of the grease reservoir 15 and cause failure during installation.

[0047] In use, the pressure post 21 is first rotated by the rotary drive unit 23 to disengage the external thread 22 from the internal thread 31, and then the pressure post 21 is pressed down. The rotary drive unit 23 can be a polygonal hole or a polygonal boss.

[0048] Example 4: This embodiment provides a method for using a protective cap for a wind turbine bolt in Embodiment 2, including the following steps: S1. Sealant 4 is pre-injected into the grease reservoir 15 of the wind turbine bolt protective cap. This step is completed at the factory.

[0049] S2. Install the wind turbine bolt protective cap onto the anchor bolt 2. During installation, rotate the screw-on body 10 until the protrusion 14 abuts against the flange 1. Figure 2 As shown.

[0050] S3. Place a tool, such as a wrench, on the tightening structure 19 to further drive the tightening body 10 to rotate until the end of the outer wall of the annular groove 16 abuts against the flange 1. At this time, the end of the helical tooth 162 is embedded in the flange 1, and the end of the protrusion 14 is embedded in the top surface of the nut 3, which has the effect of preventing it from coming off.

[0051] S4. Press down the sliding plug 20 to squeeze the sealant 4 in the grease reservoir 15. The sealant 4 enters the annular groove 16 through the first flow channel 17, sealing the bottom of the rotating body 10 with the flange 1.

[0052] S5. Further press down the sliding plug 20, and the sealant 4 in the annular groove 16 enters the receiving cavity 11 from the gap 161, such as Figure 3 As shown.

[0053] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the invention. Modifications and variations made by those skilled in the art in accordance with the spirit of the invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A protective cap for a wind turbine bolt, comprising a screwing body (10), a receiving cavity (11) at the bottom of the screwing body (10), a threaded blind hole (12) at the top of the receiving cavity (11) inside the screwing body (10), and a screwing structure (19) outside the screwing body (10), characterized in that: The top of the screwing body (10) is provided with a grease reservoir (15), and a sliding plug (20) is installed in the grease reservoir (15). The grease reservoir (15) is located below the sliding plug (20) and is used to store sealant (4). The bottom of the screwing body (10) is provided with an annular groove (16), and a first flow channel (17) is provided in the screwing body (10). One end of the first flow channel (17) is connected to the lower side of the grease reservoir (15), and the other end is connected to one side of the annular groove (16). In the use state, there is a gap (161) between the lower end of the screwing body (10) located on the inner wall of the annular groove (16) and the flange (1).

2. The wind turbine bolt protective cap according to claim 1, characterized in that: The twisting body (10) is also provided with a second flow channel (18). One end of the second flow channel (18) is connected to the upper side of the grease storage cavity (15), and the other end is connected to the other side of the annular groove (16). The positions of the first flow channel (17) and the second flow channel (18) connected to the annular groove (16) are opposite. When the sliding plug (20) is in the highest position, the sliding plug (20) closes the second flow channel (18) at one end of the grease storage cavity (15).

3. A wind turbine bolt protective cap according to claim 1, characterized in that: The end of the inner wall of the annular groove (16) is lower than the end of the outer wall, so that an annular gap (161) is formed between the end of the inner wall of the annular groove (16) and the flange (1).

4. A wind turbine bolt protective cap according to claim 1, characterized in that: Multiple helical teeth (162) are evenly distributed at the end of the inner wall of the annular groove (16). The ends of the helical teeth (162) extend a certain distance beyond the end of the outer wall of the annular groove (16), and the roots of the helical teeth (162) are a certain distance below the end of the inner wall of the annular groove (16), so that a gap (161) is formed between the roots of the helical teeth (162) and the flange (1).

5. A wind turbine bolt protective cap according to claim 4, characterized in that: Multiple protrusions (14) are provided on the step (13) at the top of the receiving cavity (11).

6. A wind turbine bolt protective cap according to claim 5, characterized in that: The protrusion (14) is a triangular pyramid structure with one end higher than the other end, and the central axis of the triangular pyramid structure is an arc concentric with the threaded blind hole (12). When the screwing body (10) is rotated clockwise during installation, the lower end of the protrusion (14) is located at the front end, and the higher end is located at the rear end.

7. A wind turbine bolt protective cap according to claim 1, characterized in that: The top of the slide (20) is provided with a pressure post (21).

8. A wind turbine bolt protective cap according to claim 7, characterized in that: An end cap (30) is fixedly installed on the top of the fat storage cavity (15). A through hole is provided in the middle of the end cap (30). When the sliding plug (20) is in the highest position, the pressure column (21) passes through the through hole.

9. A wind turbine bolt protective cap according to claim 8, characterized in that: The end cap (30) has an internal thread (31) on the lower side of the through hole, and the pressure column (21) has an external thread (22) at the lower end. The external thread (22) is screwed to the internal thread (31), and the pressure column (21) has a rotation drive part (23) on the top.

10. A method of using the wind turbine generator bolt protective cap as described in claim 6, characterized in that: Includes the following steps: S1. A sealant (4) is pre-injected into the grease reservoir (15) of the wind turbine bolt protection cap. S2. Install the wind turbine bolt protection cap onto the anchor bolt (2). During installation, rotate the screwing body (10) until the protrusion (14) abuts against the flange (1). S3. Place the tool on the screwing structure (19) and drive the screwing body (10) to rotate until the end of the outer wall of the ring groove (16) abuts against the flange (1). At this time, the end of the helical tooth (162) is embedded in the flange (1), and the end of the protrusion (14) is embedded in the top surface of the nut (3). S4, press down the sliding plug (20) to squeeze the sealant (4) in the grease reservoir (15). The sealant (4) enters the annular groove (16) through the first flow channel (17) to seal the bottom of the screwing body (10) and the flange (1). S5. Further press down the sliding plug (20), and the sealant (4) in the annular groove (16) enters the receiving cavity (11) from the gap (161).

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