Passive variable pitch system for blades

Abstract

The utility model relates to the technical field of power generation equipment, and provides a passive variable pitch system for blades. The blade passive variable pitch system comprises a rotating assembly and a blade body, the rotating assembly comprises a main shaft, an elastic piece and a fixing base, the fixing base is used for being arranged on a hub assembly, a cavity is formed in the fixing base, and part of the main shaft is rotationally arranged in the cavity; the main shaft is sleeved with the elastic piece, one end of the elastic piece is connected with the fixing base, the other end of the elastic piece is connected with the blade body so that the blade body can twist relative to the fixing base, and a sealing piece is arranged on the main shaft and makes contact with the side wall of the cavity. According to the blade passive variable pitch system provided by the invention, when the blade main body faces water flows with different flow speeds, the blade main body can be passively twisted relative to the fixed seat so as to stabilize output, dynamic sealing between the main shaft and the fixed seat can also be realized, the sizes of the sealing element and the main shaft can be reduced according to actual requirements, and the reliability of dynamic sealing is ensured.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power generation equipment, and in particular to a blade passive pitch control system. Background Art

[0002] At present, tidal energy generators generally operate in waters with a depth of 30m to 50m. During the rotation process, the blades will be affected by the periodic changes in the water flow due to the rising and falling tides, and will also be affected by the shear flow. When the blades rotate to a position close to the free water surface, the water flow speed is high, while when they rotate to a position close to the seabed, the water flow speed is low. Therefore, the blades will be subjected to periodically changing forces every time they rotate. At the same time, waves and turbulence will also increase the volatility of the force on the blades, increase the fatigue load on the blades, and cause fluctuations in the output power.

[0003] When facing water flow with different flow rates, the blades of tidal energy generators can adaptively adjust the pitch angle of the blades through a purely mechanical structure, thereby stabilizing the output power and reducing fatigue stress. However, when the blades are working in water, the mechanical structure is easily affected by impurities or water erosion, causing the mechanical structure to be damaged. Therefore, a sealing structure is often set at the root of the blade, and the size of the sealing structure is often large, and large-sized underwater seals have poor reliability. Utility Model Content

[0004] In order to solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a blade passive pitch system.

[0005] The present disclosure provides a blade passive pitch system, comprising a rotating assembly and a blade body, wherein the rotating assembly comprises a main shaft, an elastic member and a fixing seat, wherein the fixing seat is used to be arranged on a hub assembly, and a cavity is formed on the fixing seat, and a part of the main shaft is rotatably arranged in the cavity;

[0006] The elastic member is sleeved on the main shaft, and one end of the elastic member is connected to the fixed seat, and the other end is connected to the blade body, so that the blade body can be twisted relative to the fixed seat. A sealing member is arranged on the main shaft, and the sealing member is arranged in contact with the side wall of the cavity, so that the main shaft and the fixed seat are dynamically sealed.

[0007] Optionally, an opening is provided on the cavity, and part of the main shaft is rotated through the opening and arranged in the cavity, and the sealing member is arranged at a position of the main shaft corresponding to the opening to isolate the space on both sides of the sealing member.

[0008] Optionally, the elastic member is arranged on a side of the sealing member away from the fixing seat.

[0009] Optionally, the rotating assembly also includes a shell, which is arranged on the blade body. The shell is formed as a thin-walled structure and covers the outer side of the main shaft, the elastic member and the fixed seat. One end of the elastic member away from the fixed seat is arranged on the shell and connected to the blade body through the shell.

[0010] Optionally, a mounting platform is formed on the shell, and one end of the elastic member away from the fixing seat is arranged on the mounting platform through a fastener.

[0011] Optionally, one end of the shell away from the elastic member is formed as a limiting portion whose shape matches the shape of the main shaft, and the limiting portion is sleeved on the main shaft and has an interference fit with the main shaft.

[0012] Optionally, a buckle is provided at the end of the main shaft away from the elastic member, and the end of the limiting portion away from the elastic member abuts against the buckle.

[0013] Optionally, the blade passive pitch system also includes a filter cover, which is arranged at the end of the blade body close to the hub assembly, and a mounting hole is opened on the filter cover, and a gap is set between the hole wall of the mounting hole and the outer wall of the hub assembly.

[0014] Optionally, the elastic member includes an elastic body and a first fixing pile and a second fixing pile arranged at both ends of the elastic body, the first fixing pile is connected to the blade body, the second fixing pile is connected to the fixing seat, and is arranged in contact with the seal to enable the second fixing pile to be dynamically sealed with the seal.

[0015] Optionally, the blade body is formed as a hollow structure, and the rotating assembly is arranged at an end of the blade body close to the hub assembly.

[0016] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0017] The blade passive pitch system provided by the present disclosure includes a rotating assembly and a blade body, wherein the rotating assembly includes a main shaft, an elastic member and a fixed seat, wherein the fixed seat is used to be arranged on the hub assembly, and a cavity is formed on the fixed seat, and part of the main shaft is rotatably arranged in the cavity, that is, the main shaft can rotate relative to the fixed seat to avoid motion interference. The elastic member is sleeved on the main shaft, and one end of the elastic member is connected to the fixed seat, and the other end is connected to the blade body, so that the blade body can be twisted relative to the fixed seat, and the main shaft is supported inside the elastic member, which can improve the support stability and avoid bending of the elastic member. At the same time, when the blade body faces water flows with different flow rates, the blade body can be passively twisted relative to the fixed seat to reduce the fatigue load on the blade body, reduce power fluctuations, and stabilize the output. A seal is provided on the main shaft, and the seal is provided in contact with the side wall of the cavity to achieve dynamic sealing between the main shaft and the fixed seat. When the main shaft rotates, the seal can achieve dynamic sealing between the main shaft and the fixed seat to prevent impurities and water flow from entering the cavity, thereby enabling the main shaft to rotate smoothly relative to the fixed seat to ensure service life. Compared with the structure in which a sealing ring is directly provided at the root of the blade body, the seal is provided on the main shaft, and the size of the seal and the main shaft can be reduced according to actual needs, thereby ensuring the reliability of dynamic sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 This is a schematic structural diagram of a blade passive pitch control system according to an embodiment of the utility model;

[0021] Figure 2 for Figure 1 A partial enlarged view of the middle A part;

[0022] Figure 3 An exploded diagram of a blade passive pitch control system according to an embodiment of the utility model;

[0023] Figure 4 This is a schematic structural diagram of an elastic member according to an embodiment of the utility model;

[0024] Figure 5 This is a schematic structural diagram of a fixing base according to an embodiment of the utility model;

[0025] Figure 6 A cross-sectional view of a fixing base according to an embodiment of the utility model;

[0026] Figure 7 This is a schematic structural diagram of a housing according to an embodiment of the utility model;

[0027] Figure 8 A cross-sectional view of a housing according to an embodiment of the present utility model;

[0028] Fig. 9 It is a schematic structural diagram of a main shaft according to an embodiment of the utility model.

[0029] In the figure: 1. blade body; 2. main shaft; 3. elastic member; 31. elastic body; 32. first fixing pile; 33. second fixing pile; 4. fixing seat; 41. cavity; 42. mounting seat; 5. shell; 51. mounting platform; 52. limiting part; 53. second mounting flange; 6. sealing member; 7. buckle; 8. filter cover; 81. first cover shell; 82. second cover shell; 9. hub assembly. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0032] The passive pitch control system of the blades is described in detail below through a specific embodiment:

[0033] Reference Figures 1 to 9 As shown, some embodiments of the utility model provide a blade passive pitch system, including a rotating assembly and a blade body 1, the rotating assembly includes a main shaft 2, an elastic member 3 and a fixed seat 4, the fixed seat 4 is used to be set on the hub assembly 9, and a cavity 41 is formed on the fixed seat 4, and a part of the main shaft 2 is rotatably set in the cavity 41, that is, the main shaft 2 can rotate relative to the fixed seat 4 to avoid motion interference.

[0034] Specifically, the elastic member 3 is sleeved on the main shaft 2, and one end of the elastic member 3 is connected to the fixed seat 4, and the other end is connected to the blade body 1, so that the blade body 1 can be twisted relative to the fixed seat 4. It can be understood that the main shaft 2 is supported inside the elastic member 3, which can improve the support stability and avoid bending of the elastic member 3. At the same time, when the blade body 1 faces water flows with different flow rates, the blade body 1 can be passively twisted relative to the fixed seat 4 to reduce the fatigue load on the blade body 1, reduce power fluctuations, and stabilize the output.

[0035] Furthermore, a seal 6 is provided on the main shaft 2, and the seal 6 is provided in contact with the side wall of the cavity 41 to achieve dynamic sealing between the main shaft 2 and the fixed seat 4. That is to say, when the main shaft 2 rotates, the seal 6 can achieve dynamic sealing between the main shaft 2 and the fixed seat 4 to prevent impurities and water flow from entering the cavity 41, thereby enabling the main shaft 2 to rotate smoothly relative to the fixed seat 4 to ensure the service life. Compared with the structure in which a sealing ring is directly provided at the root of the blade body 1, the seal 6 is provided on the main shaft 2, and the sizes of the seal 6 and the main shaft 2 can be reduced according to actual needs, thereby ensuring the reliability of the dynamic seal.

[0036] In specific implementation, the main shaft 2 and the fixed seat 4 are rotatably connected through bearings. Lubricating oil is added to the bearings to ensure smooth rotation of the main shaft 2. The bearings used to connect the main shaft 2 and the fixed seat 4 are arranged in the cavity 41. The seal 6 can prevent impurities and water from entering the cavity 41 to avoid affecting the rotation of the main shaft 2 and ensure the service life. The fixed seat 4 and the hub assembly 9 are provided with observation ports, and the lubricating oil inside the fixed seat 4 can be checked regularly. The end cover is detachably provided at the observation port position to regularly add lubricating oil or close the observation port as needed.

[0037] In some embodiments, reference Figure 1 , Figure 5 and Figure 6 As shown, an opening is provided on the cavity 41 , and part of the main shaft 2 is rotated and arranged in the cavity 41 through the opening. The sealing member 6 is arranged at a position corresponding to the opening of the main shaft 2 , and can isolate the space on both sides of the sealing member 6 .

[0038] That is to say, part of the main shaft 2 is located in the cavity 41, and part of the main shaft 2 is located outside the cavity 41. A seal 6 is provided at the position corresponding to the opening on the main shaft 2. The seal 6 can dynamically seal with the fixed seat 4 at the opening and isolate the space on both sides of the seal 6, that is, the seal 6 can isolate the space inside and outside the fixed seat 4, and then isolate the impurities and water flow outside the fixed seat 4, so as to prevent the impurities and water flow from entering the cavity 41 of the fixed seat 4 and affecting the rotation of the main shaft 2.

[0039] Reference Figure 1 and Figure 2As shown, the elastic member 3 is arranged on the side of the sealing member 6 away from the fixing seat 4, that is, the elastic member 3 can be exposed to the water, and the surface of the elastic member 3 can be cleaned by the water flow. At the same time, when the elastic member 3 is damaged and needs to be replaced, there is no need to destroy the sealing structure between the main shaft 2 and the fixing seat 4, which is convenient for later maintenance. It can be understood that the elastic member 3 is also accompanied by an axial extension movement along the main shaft 2 during the torsion process. The elastic member 3 is arranged on the side of the sealing member 6 away from the fixing seat 4, which can prevent the elastic member 3 from pushing the sealing member 6 and causing it to deviate from the preset sealing position when extending axially, thereby ensuring the sealing effect.

[0040] In some embodiments, the rotating assembly further includes a housing 5, which is disposed on the blade body 1. Figure 7 and Figure 8 As shown, the shell 5 is formed as a thin-walled structure and is covered on the outside of the main shaft 2, the elastic member 3 and the fixed seat 4, that is, the shell 5 is formed as an internal hollow structure, and the main shaft 2, the elastic member 3 and the fixed seat 4 can all be arranged inside the shell 5, and the end of the elastic member 3 away from the fixed seat 4 is arranged on the shell 5 and connected to the blade body 1 through the shell 5.

[0041] That is to say, the end of the elastic member 3 away from the fixed seat 4 is arranged on the shell 5, and the shell 5 is arranged on the blade body 1. The shell 5 and the blade body 1 connected to the shell 5 can be twisted relative to the end of the elastic member 3 close to the fixed seat 4, so that the blade body 1 can be twisted relative to the fixed seat 4 to passively adapt to water flows with different flow rates and reduce the fatigue load on the blade body 1.

[0042] Continue to refer to Figure 7 and Figure 8 As shown, a mounting platform 51 is formed on the housing 5, and one end of the elastic member 3 away from the fixing seat 4 is arranged on the mounting platform 51 through a fastener. Specifically, mounting holes can be opened on the mounting platform 51 and the elastic member 3, and the fasteners are respectively inserted into the mounting holes on the mounting platform 51 and the elastic member 3 to connect the mounting platform 51 and the elastic member 3, thereby being able to drive the housing 5 to twist relative to the fixing seat 4.

[0043] In some embodiments, one end of the housing 5 away from the elastic member 3 is formed as a stopper 52 whose shape matches the shape of the main shaft 2. The stopper 52 is sleeved on the main shaft 2 and has an interference fit with the main shaft 2. It can be understood that the stopper 52 has an interference fit with the main shaft 2, which can limit the axial movement of the housing 5 relative to the main shaft 2. That is, even if the elastic member 3 extends along the axial direction of the main shaft 2 during the torsion process, it will not drive the housing 5 and the blade body 1 to move along the axial direction of the main shaft 2. Specifically, the stopper 52 and the main shaft 2 form a wedge-shaped structure for easy installation.

[0044] Further, the end of the main shaft 2 away from the elastic member 3 is provided with a buckle 7, and the end of the limiting portion 52 away from the elastic member 3 abuts against the buckle 7. It can be understood that the end of the limiting portion 52 away from the elastic member 3 abuts against the buckle 7, which can further limit the axial movement of the housing 5 and the blade body 1, ensure structural stability, and reduce fluctuations in output power.

[0045] In some embodiments, reference Figure 1 and Figure 3 As shown, the blade passive pitch system also includes a filter cover 8, which is arranged at the end of the blade body 1 close to the hub assembly 9, and a mounting hole is opened on the filter cover 8. A gap is set between the hole wall of the mounting hole and the outer wall of the hub assembly 9 to avoid motion interference between the filter cover 8 and the hub assembly 9 when the filter cover 8 rotates. In other words, the filter cover 8 can be twisted with the blade body 1, and can prevent impurities and large particles in the water area from entering the interior of the blade body 1 and damaging the internal mechanical structure.

[0046] Specifically, the filter cover 8 includes a first cover shell 81 and a second cover shell 82 that are connected to each other. The first cover shell 81 and the second cover shell 82 together form a cover structure. Clean fresh water is regularly injected into the cover structure to protect the internal mechanical structure of the blade body 1. The filter cover 8 allows water flow exchange in a small amount of water area, and large particles of impurities can be filtered out during the water flow exchange.

[0047] The end of the blade body 1 close to the hub assembly 9 is formed with a first mounting flange, and the first cover shell 81 and the second cover shell 82 are respectively arranged on both sides of the first mounting flange, and are fastened to the first mounting flange on the blade body 1 by fasteners such as bolts, thereby realizing the installation of the filter cover 8. In specific implementation, the first cover shell 81 and the second cover shell 82 can be an integrated structure made of elastic material to be directly mounted on the blade body 1, or a split structure, which is not limited in the present disclosure.

[0048] Further, refer to Figure 3 As shown, a second mounting flange 53 is formed at the end of the shell 5 close to the hub assembly 9, the first mounting flange and the second mounting flange 53 are stacked, and the first cover shell 81 and the second cover shell 82 are respectively provided on both sides, that is, the first mounting flange and the second mounting flange 53 can be arranged between the first cover shell 81 and the second cover shell 82, and then the shell 5 is connected to the blade body 1, so that the shell 5, the filter cover 8 and the blade body 1 can be twisted relative to the fixing seat 4, which can prevent impurities and large particles from entering the blade body 1 or the shell 5 and damaging the internal mechanical structure.

[0049] In some embodiments, reference Figure 4As shown, the elastic member 3 includes an elastic body 31 and a first fixing pile 32 and a second fixing pile 33 arranged at both ends of the elastic body 31, the first fixing pile 32 is connected to the blade body 1, and the second fixing pile 33 is connected to the fixing seat 4. Specifically, the second fixing pile 33 is connected to the fixing seat 4 through a mounting seat 42, and the mounting seat 42 is arranged on the fixing seat 4.

[0050] The second fixing pile 33 is arranged in contact with the sealing member 6 so as to achieve dynamic sealing between the second fixing pile 33 and the sealing member 6. It is understandable that the second fixing pile 33 is arranged on the mounting seat 42 on the fixing seat 4 and is arranged in contact with the sealing member 6, which can further ensure the sealing effect and the service life. Specifically, the elastic body 31 can be a seawater torsion spring with special surface treatment.

[0051] In a specific implementation, the blade body 1 is formed as a hollow structure, and the rotating assembly is arranged at the end of the blade body 1 close to the hub assembly 9. It can be understood that injecting water into the blade body 1 can clean and maintain the elastic member 3.

[0052] When installing the passive pitch system of the blade disclosed in the present invention, the bearing and the main shaft 2 are first installed in the fixing seat 4, and the dynamic seal 6 is installed to seal the cavity 41, and then the elastic member 3, the shell 5 and the buckle 7 are installed in sequence; the assembled parts are assembled to the hub assembly 9, and then the hub assembly 9 is assembled with other parts such as the unit gear box and the generator to generate tidal energy; finally, the filter cover 8 is installed at the end of the blade body 1 close to the hub assembly 9, and the shell 5 is set on the blade body 1 to complete the assembly.

[0053] Specifically, during assembly, an initial torque is first applied to the blade body 1 through the torsion elastic member 3. The initial torque can enable the blade body 1 to achieve a preset output power when working at the rated water flow rate. When the actual working water flow rate increases or decreases, the elastic member 3 can further twist or restore the twisting, so that the blade body 1 always maintains a force balance, thereby reducing power fluctuations and stabilizing the output.

[0054] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0055] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A blade passive pitch control system, characterized in that: The invention comprises a rotating assembly and a blade body (1), wherein the rotating assembly comprises a main shaft (2), an elastic member (3) and a fixing seat (4), wherein the fixing seat (4) is used to be arranged on a hub assembly (9), and a cavity (41) is formed on the fixing seat (4), and a part of the main shaft (2) is rotatably arranged in the cavity (41); The elastic member (3) is sleeved on the main shaft (2), and one end of the elastic member (3) is connected to the fixing seat (4), and the other end is connected to the blade body (1), so that the blade body (1) can be twisted relative to the fixing seat (4). A sealing member (6) is provided on the main shaft (2), and the sealing member (6) is arranged in contact with the side wall of the cavity (41), so that the main shaft (2) and the fixing seat (4) are dynamically sealed.

2. The blade passive pitch system according to claim 1, characterized in that: The cavity (41) is provided with an opening, and part of the main shaft (2) is rotated through the opening and arranged in the cavity (41), and the sealing member (6) is arranged at a position of the main shaft (2) corresponding to the opening to isolate the space on both sides of the sealing member (6).

3. The blade passive pitch system according to claim 1, characterized in that: The elastic member (3) is arranged on a side of the sealing member (6) away from the fixing seat (4).

4. The blade passive pitch system according to claim 1, characterized in that: The rotating assembly further comprises a shell (5), wherein the shell (5) is arranged on the blade body (1), the shell (5) is formed into a thin-walled structure and is arranged on the outer side of the main shaft (2), the elastic member (3) and the fixing seat (4), and one end of the elastic member (3) away from the fixing seat (4) is arranged on the shell (5) and is connected to the blade body (1) via the shell (5).

5. The blade passive pitch system according to claim 4, characterized in that: A mounting platform (51) is formed on the housing (5), and one end of the elastic member (3) away from the fixing seat (4) is arranged on the mounting platform (51) via a fastener.

6. The blade passive pitch system according to claim 4, characterized in that: One end of the housing (5) away from the elastic member (3) is formed as a limiting portion (52) whose shape matches the shape of the main shaft (2); the limiting portion (52) is sleeved on the main shaft (2) and has an interference fit with the main shaft (2).

7. The blade passive pitch system according to claim 6, characterized in that: A buckle (7) is provided at the end of the main shaft (2) away from the elastic member (3), and the end of the limiting portion (52) away from the elastic member (3) abuts against the buckle (7).

8. The blade passive pitch system according to any one of claims 1 to 7, characterized in that: The passive pitch control system for blades also includes a filter cover (8), which is arranged at an end of the blade body (1) close to the hub assembly (9), and a mounting hole is provided on the filter cover (8), and a gap is set between the hole wall of the mounting hole and the outer wall of the hub assembly (9).

9. The blade passive pitch system according to any one of claims 1 to 7, characterized in that: The elastic member (3) comprises an elastic body (31) and a first fixing pile (32) and a second fixing pile (33) arranged at two ends of the elastic body (31), wherein the first fixing pile (32) is connected to the blade body (1), and the second fixing pile (33) is connected to the fixing seat (4) and is arranged in contact with the sealing member (6) so that the second fixing pile (33) and the sealing member (6) are dynamically sealed.

10. The blade passive pitch system according to any one of claims 1 to 7, characterized in that: The blade body (1) is formed as a hollow structure, and the rotating assembly is arranged at an end portion of the blade body (1) close to the hub assembly (9).

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