A direct drive wind turbine generator system

Abstract

The utility model belongs to the technical field of wind generating set, disclose a kind of direct-drive wind generating set, including main shaft, wind wheel and generator, the both ends of main shaft are connected wind wheel and generator respectively, the inside of main shaft forms inner chamber, the side of main shaft forms exhaust hole, exhaust hole communicates inner chamber, exhaust hole sealing installation cover, cover installs breather valve, breather valve communicates exhaust hole;The direct-drive wind generating set provided by the utility model, when the inner chamber pressure of main shaft on the side of breather valve exceeds atmospheric pressure, breather valve will automatically open to release excess pressure, and then accurately control the inner chamber of main shaft and external air pressure balance, prevent the grease overflow in the inside of main shaft, avoid the damage of inside parts of main shaft, still can avoid the impurity (such as sand dust, water vapor etc.) by exhaust hole into the inner chamber of main shaft under the premise of guaranteeing exhaust effect of exhaust hole, ensure the cleanness of the inner chamber of main shaft, can guarantee that generator set normally operates.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine generator technology, and in particular to a direct-drive wind turbine generator. Background Technology

[0002] The main shaft of a direct-drive wind turbine is the core load-bearing component connecting the wind turbine and the generator rotor. It typically contains enclosed or semi-enclosed chambers (such as the space formed by the assembly gaps between the main shaft and the bearing housing or rear end cover). During operation, the main shaft rotates at high speed with the wind turbine. Due to frictional heat generation and changes in ambient temperature, the air inside the chambers expands and contracts with temperature fluctuations. Furthermore, the main shaft generates gas or vapor during operation, causing pressure fluctuations within the internal chambers.

[0003] If the gas in the internal chamber cannot be discharged in time, the internal and external pressure of the spindle will be in an uneven state for a long time, which may lead to problems such as grease overflow from the spindle and damage to the internal components of the spindle, thereby affecting the normal operation and life of the unit. Utility Model Content

[0004] The purpose of this invention is to provide a direct-drive wind turbine generator set that achieves pressure balance inside and outside the main shaft, ensuring the cleanliness of the main shaft interior.

[0005] To achieve this objective, the present invention adopts the following technical solution: A direct-drive wind turbine generator set includes a main shaft, a wind turbine, and a generator. The two ends of the main shaft are connected to the wind turbine and the generator, respectively. An inner cavity is formed inside the main shaft, and an exhaust port is formed on the side of the main shaft. The exhaust port communicates with the inner cavity. A cover plate is installed to seal the exhaust port, and a breather valve is installed on the cover plate. The breather valve communicates with the exhaust port.

[0006] Preferably, a mounting hole is formed through the center of the cover plate, and the breather valve is installed in the mounting hole.

[0007] Preferably, the direct-drive wind turbine generator set further includes an exhaust pipe, which is fixed in the inner cavity, with one end of the exhaust pipe extending into the mounting hole and the other end extending into the inner cavity.

[0008] Preferably, the outer ring of the vent hole protrudes outward to form an vent ring, and the cover plate is installed on and sealed to the vent ring.

[0009] Preferably, the direct-drive wind turbine generator set further includes a sealing gasket, which is fixed to the outer wall of the main shaft, and the outer wall of the exhaust ring and the outer wall of the cover plate are both sandwiched between the inner wall of the sealing gasket.

[0010] Preferably, the cover plate has a plurality of connecting holes spaced apart circumferentially, and the exhaust ring has a plurality of screw holes spaced apart circumferentially. The plurality of connecting holes and the plurality of screw holes correspond one-to-one. The connecting bolts extend into the connecting holes and are screwed into the corresponding screw holes to connect the cover plate and the exhaust ring.

[0011] Preferably, the outer wall of the connecting bolt and the cover plate are filled with thread-locking adhesive.

[0012] Preferably, the diameter of the cover plate is 260cm and the diameter of the connecting hole is 12.5cm.

[0013] Preferably, the mounting hole is concentric with the cover plate, and the diameter of the mounting hole is 12cm, and the distance between the center of any of the connecting holes and the center of the mounting hole is 230cm.

[0014] Preferably, the cover plate has a thickness of 10 cm.

[0015] The beneficial effects of this utility model are: This utility model provides a direct-drive wind turbine generator set, including a main shaft, a wind turbine, and a generator. The wind turbine and the generator are connected to the two ends of the main shaft, respectively. An inner cavity is formed inside the main shaft, and an exhaust port is formed on the side of the main shaft. The exhaust port is connected to the inner cavity, and a cover plate is installed on the exhaust port. A breather valve is installed on the cover plate and is connected to the exhaust port. In the direct-drive wind turbine generator set provided by this utility model, when the pressure in the inner cavity of the main shaft on the breather valve side exceeds atmospheric pressure, the breather valve will automatically open to release the excess pressure, thereby precisely controlling the pressure balance between the inner cavity of the main shaft and the external air pressure, preventing the leakage of lubricating grease inside the main shaft, avoiding damage to the internal components of the main shaft, and also preventing external impurities (such as sand, dust, water vapor, etc.) from entering the inner cavity of the main shaft through the exhaust port while ensuring the exhaust effect of the exhaust port, thus ensuring the cleanliness of the inner cavity of the main shaft and ensuring the normal operation of the generator set. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main shaft provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this utility model; Figure 3 This is a partial sectional view of the spindle provided in an embodiment of the present invention.

[0017] In the picture: 1. Spindle; 10. Inner cavity; 11. Exhaust port; 12. Exhaust ring; 121. Screw hole; 2. Cover plate; 21. Mounting hole; 22. Connecting hole; 3. Breathing valve; 4. Exhaust pipe; 5. Sealing gasket. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0022] During unit operation, the main shaft rotates at high speed with the impeller. Due to factors such as frictional heat generation and changes in ambient temperature, the air inside the internal chamber will expand and contract. In addition, the main shaft will generate a certain amount of gas or steam during operation, causing fluctuations in the air pressure inside the internal chamber. If the gas inside the internal chamber cannot be discharged in time, the air pressure inside and outside the main shaft will be in an uneven state for a long time, which may lead to problems such as grease overflow inside the main shaft and damage to internal components, thereby affecting the normal operation and life of the unit.

[0023] Therefore, this embodiment provides a direct-drive wind turbine generator set that can promptly discharge the gas or steam generated inside the main shaft, achieve pressure balance inside and outside the main shaft, prevent the overflow of lubricating grease inside the main shaft, avoid damage to internal components caused by pressure fluctuations, and also prevent external impurities (dust, water vapor) from entering the main shaft, ensuring the cleanliness of the main shaft and the normal operation of the generator set.

[0024] Specifically, please refer to Figures 1 to 3 The direct-drive wind turbine generator set provided in this embodiment includes a main shaft 1, a wind turbine, and a generator. The main shaft 1 has the wind turbine and generator connected to its two ends, respectively. The wind turbine includes blades and a hub, consisting of multiple blades and a central hub. The blades effectively capture wind energy and convert it into mechanical energy. The hub secures the blades together and connects them to the end of the main shaft 1. Wind acts on the blades of the wind turbine, causing them to rotate. This rotational motion is transmitted to the main shaft 1 via the hub. The main shaft 1 receives the mechanical energy from the wind turbine and transmits it to the generator. The rotor inside the generator rotates due to the mechanical energy, thereby generating an electric current.

[0025] To reduce weight, provide installation space for wires or other components, and store lubricating grease, an inner cavity 10 is formed inside the main shaft 1. However, during the high-speed rotation of the main shaft 1 with the impeller, the inner cavity 10 will generate a certain amount of gas or steam. Furthermore, due to factors such as frictional heat generation and changes in ambient temperature, the air in the inner cavity 10 will expand and contract. All of these factors will cause air pressure fluctuations in the inner cavity 10, resulting in an imbalance of air pressure inside and outside the main shaft 1.

[0026] Therefore, please refer to Figure 1 In this embodiment, an exhaust port 11 is formed on the side of the spindle 1. The exhaust port 11 connects to the inner cavity 10. The exhaust port 11 balances the air pressure inside and outside the spindle 1, achieving air pressure balance between the inner cavity 10 and the outside, avoiding damage to the mounting components of the inner cavity 10 caused by air pressure fluctuations, and preventing the leakage of lubricating grease inside the spindle 1. Optionally, the exhaust port 11 can also be used to replenish lubricating oil.

[0027] For example, please refer to Figure 1 and Figure 3 In this embodiment, a cover plate 2 is installed at the exhaust port 11 to prevent external impurities (such as sand, dust, water vapor, etc.) from entering the inner cavity 10 of the main shaft 1 through the exhaust port 11, thereby ensuring the cleanliness of the inner cavity 10 of the main shaft 1 and ensuring the normal operation of the generator set.

[0028] For further information, please refer to [link / reference]. Figure 1 and Figure 3A breather valve 3 is installed on the cover plate 2. The breather valve 3 is connected to the exhaust port 11, and then to the inner cavity 10 of the main shaft 1, so as to achieve the balance between the inner cavity 10 of the main shaft 1 and the external pressure. It should be noted that the breather valve 3 is also called a ventilation valve or a pressure vacuum relief valve, which is a commonly used device in the prior art. When the pressure on one side of the breather valve 3 exceeds atmospheric pressure, the breather valve 3 will automatically open to release the excess pressure, thereby precisely controlling the pressure balance on both sides of the breather valve 3.

[0029] With the above settings, this embodiment seals and installs a cover plate 2 at the exhaust port 11, and installs a breather valve 3 on the cover plate 2 so that the breather valve 3 is connected to the exhaust port 11. Under the premise of ensuring the exhaust effect of the exhaust port 11, external impurities (such as sand, dust, water vapor, etc.) are prevented from entering the inner cavity 10 of the main shaft 1 through the exhaust port 11, thus ensuring the cleanliness of the inner cavity 10 of the main shaft 1 and ensuring the normal operation of the generator set.

[0030] Optionally, please refer to Figures 1 to 3 By opening an installation hole 21 through the center of the cover plate 2, the breather valve 3 is installed in the installation hole 21, and the seal between the breather valve 3 and the installation hole 21 is ensured.

[0031] In this embodiment, the spindle 1 is subjected to load and rotational condition tests. The mounting hole 21 is set to be concentric with the cover plate 2. The cover plate 2 has a thickness of 10cm and a diameter of 260cm. The mounting hole 21 has a diameter of 12cm. While effectively relieving the pressure in the inner cavity 10, the overall structure is ensured not to affect the rigidity and strength performance of the spindle 1.

[0032] In some feasible embodiments, please refer to Figure 3 The direct-drive wind turbine generator set also includes an exhaust pipe 4, which is fixed in the inner cavity 10 of the main shaft 1. One end of the exhaust pipe 4 extends into the mounting hole 21 and the other end extends into the inner cavity 10 to provide a discharge channel for the pressure in the inner cavity 10.

[0033] Preferably, please refer to Figure 1 and Figure 3 The outer ring of the exhaust hole 11 protrudes outward to form an exhaust ring 12, and the cover plate 2 is installed on and sealed on the exhaust ring 12.

[0034] This embodiment provides a sealing installation method for the cover plate 2 and the vent ring 12. For example, please refer to [link to example]. Figure 2 and Figure 3 The cover plate 2 has several connecting holes 22 spaced apart around its circumference, and the exhaust ring 12 has several screw holes 121 spaced apart around its circumference. The connecting holes 22 and the screw holes 121 correspond one-to-one. Several connecting bolts are inserted into the connecting holes 22 and screwed into the corresponding screw holes 121 to complete the connection and sealing between the cover plate 2 and the exhaust ring 12.

[0035] To improve the sealing effect between the cover plate 2 and the vent ring 12, after the connecting bolt is inserted into the connecting hole 22 and screwed into the corresponding screw hole 121, thread locking adhesive can also be applied to the outer wall of the connecting bolt to fill the gap between the outer wall of the connecting bolt and the cover plate 2, prevent air leakage from the connecting hole 22, and enhance the sealing effect.

[0036] In this embodiment, the spindle 1 is tested under load and rotation conditions. The diameter of the connecting hole 22 is set to 12.5cm, and the distance between the center of any connecting hole 22 and the center of the mounting hole 21 is 230cm.

[0037] Furthermore, please refer to Figure 3 The direct-drive wind turbine generator set also includes a sealing gasket 5, which is fixed to the outer wall of the main shaft 1. The outer wall of the exhaust ring 12 and the outer wall of the cover plate 2 are both sandwiched in the inner wall of the sealing gasket 5. That is, the size of the exhaust ring 12 is the same as the size of the cover plate 2. The gap between the exhaust ring 12 and the cover plate 2 is sealed by the sealing gasket 5 to prevent air leakage.

[0038] The direct-drive wind turbine generator set provided in this embodiment can automatically open the breather valve 3 to release excess pressure when the pressure in the inner cavity 10 of the main shaft 1 on one side of the breather valve 3 exceeds atmospheric pressure. This precisely controls the balance between the inner cavity 10 of the main shaft 1 and the external air pressure, preventing the leakage of lubricating grease inside the main shaft 1 and avoiding damage to the internal components of the main shaft 1. It can also prevent external impurities (such as sand, dust, water vapor, etc.) from entering the inner cavity 10 of the main shaft 1 through the exhaust port 11 while ensuring the exhaust effect of the exhaust port 11, thus ensuring the cleanliness of the inner cavity 10 of the main shaft 1 and ensuring the normal operation of the generator set.

[0039] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A direct-drive wind turbine generator set, characterized in that, The device includes a main shaft (1), a wind turbine, and a generator. The two ends of the main shaft (1) are connected to the wind turbine and the generator, respectively. An inner cavity (10) is formed inside the main shaft (1). An exhaust port (11) is formed on the side of the main shaft (1). The exhaust port (11) is connected to the inner cavity (10). A cover plate (2) is installed to seal the exhaust port (11). A breather valve (3) is installed on the cover plate (2). The breather valve (3) is connected to the exhaust port (11).

2. The direct-drive wind turbine generator set according to claim 1, characterized in that, The cover plate (2) has a through hole (21) in the center, and the breather valve (3) is installed in the through hole (21).

3. A direct-drive wind turbine generator set according to claim 2, characterized in that, The direct-drive wind turbine generator set also includes an exhaust pipe (4), which is fixed in the inner cavity (10), with one end of the exhaust pipe (4) extending into the mounting hole (21) and the other end extending into the inner cavity (10).

4. A direct-drive wind turbine generator set according to claim 2, characterized in that, The outer ring of the vent hole (11) protrudes outward to form a vent ring (12), and the cover plate (2) is installed on and sealed to the vent ring (12).

5. A direct-drive wind turbine generator set according to claim 4, characterized in that, The direct-drive wind turbine generator set also includes a sealing gasket (5), which is fixed to the outer wall of the main shaft (1), and the outer wall of the exhaust ring (12) and the outer wall of the cover plate (2) are both sandwiched in the inner wall of the sealing gasket (5).

6. A direct-drive wind turbine generator set according to claim 4, characterized in that, The cover plate (2) has a plurality of connecting holes (22) spaced apart in the circumference, and the exhaust ring (12) has a plurality of screw holes (121) spaced apart in the circumference. The plurality of connecting holes (22) and the plurality of screw holes (121) correspond one-to-one. The connecting bolts extend into the connecting holes (22) and are screwed into the corresponding screw holes (121) to connect the cover plate (2) and the exhaust ring (12).

7. A direct-drive wind turbine generator set according to claim 6, characterized in that, The outer wall of the connecting bolt and the cover plate (2) are filled with thread-locking adhesive.

8. A direct-drive wind turbine generator set according to claim 6, characterized in that, The diameter of the cover plate (2) is 260cm, and the diameter of the connecting hole (22) is 12.5cm.

9. A direct-drive wind turbine generator set according to claim 8, characterized in that, The mounting hole (21) is concentric with the cover plate (2), and the diameter of the mounting hole (21) is 12cm. The distance between the center of any of the connecting holes (22) and the center of the mounting hole (21) is 230cm.

10. A direct-drive wind turbine generator set according to any one of claims 1-9, characterized in that, The cover plate (2) is 10cm thick.

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