Ventilation device for gear box and wind power gear box

Abstract

The utility model belongs to the technical field of wind power equipment, and discloses a ventilation device for a gear box and the wind power gear box. The ventilation device for the gearbox comprises a ventilation channel and a ventilation piece, the ventilation channel is formed in a fixing structure of the gearbox, the interior and the exterior of the gearbox are communicated through the ventilation channel, the ventilation channel comprises at least one bent channel, and the problem that splashing lubricating oil flows to the ventilation piece along the ventilation channel to cause failure of the ventilation piece is solved; the ventilation piece is connected to the ventilation channel in a sealed mode and arranged on the outer side of the gear box to achieve communication between the interior and the exterior of the gear box, and therefore pressure inside and outside the gear box is balanced. The resistance of airflow or other flowing liquid in the ventilation channel is increased, and the effect of partially blocking splashed lubricating oil is achieved. And the length of the ventilation channel is increased, so that oil gas in the gear box can be cooled and flow back into the gear box after entering the ventilation channel, the service life of the ventilation piece is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wind power equipment technology, and in particular to a ventilator for a gearbox and a wind power gearbox. Background Technology

[0002] During operation, wind turbine gearboxes typically contain a large amount of lubricating oil due to their lubrication and cooling requirements. When the gearbox rotates at high speed, this lubricating oil is splashed throughout the gearbox by the rotating components. Simultaneously, the gearbox operation causes the oil sump temperature to rise, generating a large amount of oil vapor. This internal temperature rise also leads to a higher internal pressure than external pressure. To balance this pressure difference and protect the gearbox seals, the traditional solution is to install a vent cap on the viewing cover and connect it to the outside of the gearbox via a pipe. However, this method is prone to seal failure or connection failure after prolonged use. Furthermore, with the increasing size of wind turbine gearboxes, the amount of lubricating oil and oil vapor inside has increased, making the vent cap on the viewing cover insufficient to meet the current ventilation pressure requirements of wind turbine gearboxes.

[0003] Currently, multiple vent caps and air filters are typically installed directly on the gearbox housing. During use, particles in the vent caps or air filters are prone to premature failure and blackening. The specific reasons for this failure are as follows: 1. The high-speed rotation of the gearbox causes lubricating oil to flow backward along the gearbox wall into the vent cap or air filter, where it adheres to the water-absorbing particles; 2. Oil and gas inside the gearbox cool down inside the air filter and adhere to the water-absorbing particles, causing the air filter to blacken. To address these issues, existing solutions mostly involve adding a heightening joint to the outside of the gearbox to reduce the contact between the lubricating oil and oil vapor inside the gearbox and the vent cap or air filter, or adding an oil baffle at the connection between the vent cap and the air filter to prevent the entry of lubricating oil and oil vapor. However, these solutions may affect the appearance of the gearbox or increase additional material costs.

[0004] Therefore, there is an urgent need for a venting device for gearboxes to solve the above-mentioned technical problems. Utility Model Content

[0005] One objective of this invention is to provide a venting device for gearboxes that can improve the problem of early failure of venting components, reduce gearbox design and maintenance costs, and does not affect the appearance of the gearbox.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A venting device for a gearbox includes:

[0008] A ventilation channel is provided on the fixed structure of the gearbox, the ventilation channel connects the inside and outside of the gearbox, and the ventilation channel includes at least one bend.

[0009] A ventilator is disposed on the outside of the gearbox and is sealed to the ventilator channel.

[0010] Optionally, the aforementioned bending channel is provided, and the aforementioned ventilating channel further includes a direct current channel. The two ends of the aforementioned direct current channel are respectively sealed and connected to the aforementioned ventilating element and the bending channel, and the length of the aforementioned direct current channel is greater than the length of the aforementioned bending channel.

[0011] Optionally, multiple bending channels are provided, and the multiple bending channels are connected in sequence.

[0012] Optionally, the above-mentioned ventilation channel and the above-mentioned ventilation component are threaded together.

[0013] Optionally, a sealing element is provided between the above-mentioned ventilation channel and the above-mentioned ventilation component to make the two sealed together.

[0014] Alternatively, the aforementioned ventilation channels are formed by casting or drilling.

[0015] Optionally, the above-mentioned ventilated component is a vent cap or an air filter.

[0016] Optionally, it also includes an oil guide hole, which is formed on the fixed structure of the gearbox, and the two ends of the oil guide hole are respectively connected to the bottom of the bent channel away from the vent and the interior of the gearbox.

[0017] Optionally, along the bottom of the aforementioned bent channel to the interior of the aforementioned gearbox, the aforementioned oil guide hole is inclined in a direction away from the aforementioned venting member.

[0018] Another objective of this utility model is to provide a wind turbine gearbox, including a fixed structure and the aforementioned ventilation device for the gearbox, wherein the ventilation device for the gearbox is disposed on the fixed structure.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a venting device for a gearbox and a wind turbine gearbox. By directly opening a venting channel on the fixed structure of the gearbox, and setting at least one bend in the venting channel, the resistance of airflow or other flowing liquids in the venting channel is increased, achieving a partial blocking effect on splashed lubricating oil. Furthermore, the addition of the bend also increases the length of the venting channel. Since the venting channel is set in the fixed structure and connects the inside and outside of the gearbox, at least part of the fixed structure is exposed, and its temperature is lower than the temperature inside the gearbox. This allows oil and gas inside the gearbox to be cooled and flow back into the gearbox after entering the venting channel, without reaching the venting component, thus preventing contamination of the venting component and improving its service life. Moreover, it eliminates the need for additional structures, reduces the number of connection and sealing positions, improves service life, is low in cost, and does not affect the appearance of the gearbox. Attached Figure Description

[0021] Figure 1 This is an isometric view of the venting device for a gearbox after installation, provided in a specific embodiment of this utility model.

[0022] Figure 2 This is a cross-sectional view of a venting device for a gearbox provided in an optional embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of a venting device for a gearbox provided in another optional embodiment of the present invention.

[0024] In the picture:

[0025] 10. Ventilation channel; 11. Bend channel; 12. Direct current channel;

[0026] 20. Ventilation component; 30. Oil guide hole;

[0027] 200. Fixed structure. Detailed Implementation

[0028] 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.

[0029] 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 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.

[0030] 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.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," "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.

[0032] The following reference Figures 1 to 3 This invention introduces a ventilation device for gearboxes and a wind turbine gearbox.

[0033] Please refer to Figures 1 to 3 This embodiment provides a venting device for a gearbox, which includes a venting channel 10 and a venting element 20. The venting channel 10 is formed on the fixed structure 200 of the gearbox and connects the inside and outside of the gearbox. The venting channel 10 includes at least one bend 11 to improve the problem of splashed lubricating oil flowing along the venting channel 10 to the venting element 20 and causing the venting element 20 to fail. The venting element 20 is disposed on the outside of the gearbox and is sealed to the venting channel 10 to realize the communication between the inside and outside of the gearbox, thereby balancing the pressure inside and outside of the gearbox.

[0034] The venting device for the gearbox in this embodiment has a venting channel 10 directly formed on the fixed structure 200 of the gearbox, and at least one bend 11 is provided in the venting channel 10. This increases the resistance of airflow or other flowing liquids in the venting channel 10, achieving a partial blocking effect on splashed lubricating oil. The addition of the bend 11 also increases the length of the venting channel 10. Since the venting channel 10 is set in the fixed structure 200 and connects the inside and outside of the gearbox, at least part of the fixed structure 200 is exposed, and its temperature is lower than the temperature inside the gearbox. This allows the oil and gas inside the gearbox to be cooled and flow back into the gearbox after entering the venting channel 10, without reaching the venting component 20, thus preventing contamination of the venting component 20 and improving its service life. Furthermore, it eliminates the need for additional structures, reduces the number of connection and sealing positions, improves service life, has low cost, and does not affect the appearance of the gearbox.

[0035] It should be noted that the fixing structure 200 in this embodiment is preferably a stiffener, because the stiffener is far from the rotating parts inside the gearbox, which also reduces the amount of lubricating oil entering the ventilation channel 10, and further improves the service life of the ventilation component 20.

[0036] Alternatively, the ventilation channel 10 can be formed by casting or drilling.

[0037] Please refer to Figure 2 In an optional embodiment, the bent channel 11 is provided, and the venting channel 10 further includes a direct current channel 12. The two ends of the direct current channel 12 are respectively sealed and connected to the venting component 20 and the bent channel 11. The length of the direct current channel 12 is greater than the length of the bent channel 11. This arrangement not only increases the length of the venting channel 10, which is beneficial for blocking splashed lubricating oil and increasing the path for oil-gas cooling return flow, but also further blocks splashed lubricating oil through the bent channel 11, thereby effectively extending the service life of the venting component 20. Furthermore, a smaller number of bent channels 11 facilitates the processing of the venting channel 10, improving processing convenience.

[0038] Specifically, the processing of a bent channel 11 and a DC channel 12 can be achieved by drilling, which is convenient and low-cost.

[0039] Please refer to Figure 3 In another optional embodiment, multiple bend channels 11 are provided, and the multiple bend channels 11 are sequentially connected. This arrangement not only increases the length of the vent channel 10, which is beneficial for blocking splashed lubricating oil and increasing the path for oil-gas cooling and return flow, but also increases the tortuosity of the vent channel 10, that is, further increases the blocking effect of splashed lubricating oil and the cooling and blocking effect of oil-gas, thereby effectively extending the service life of the vent component 20.

[0040] Specifically, the multiple bends 11 can be formed by casting, thus creating the meandering ventilation channel 10.

[0041] It is understood that the bend channel 11 communicating with the inside of the gearbox can be set at an angle or at a horizontal angle, both of which can achieve the effect of obstructing splashed lubricating oil, and no specific limitation is made here. For example, the bend channel 11 communicating with the inside of the gearbox can be set at an angle facing downwards to facilitate the return flow of lubricating oil and oil vapor.

[0042] Optionally, the bending angle of the bending channel 11 can be an acute angle, a right angle, or an obtuse angle, and no specific limitation is made here.

[0043] Furthermore, the ventilation channel 10 and the ventilation element 20 are threaded together to achieve a fixed connection between the two.

[0044] Furthermore, a sealing element is provided between the ventilation channel 10 and the ventilation component 20 to ensure a sealed connection between the two.

[0045] Specifically, both the ventilation channel 10 and the ventilation component 20 are provided with threaded portions, which are connected in a mating manner. A sealing element is provided between the ventilation channel 10 and the ventilation component 20 to achieve a sealed and fixed connection between the two.

[0046] Of course, other embodiments also have other methods of sealing and fixing the ventilation channel 10 and the ventilation component 20. For example, both the ventilation channel 10 and the ventilation component 20 are provided with threaded portions, and a connector is also provided between the ventilation channel 10 and the ventilation component 20. The two ends of the connector are provided with connecting threads, and the two ends of the connector are respectively engaged with the threaded portions of the ventilation channel 10 and the ventilation component 20 through the connecting threads. Sealing elements are provided between the ventilation channel 10 and the connector, and between the ventilation component 20 and the connector, to achieve a fixed connection between the two.

[0047] Furthermore, the aforementioned venting element 20 can be a venting cap or an air filter, both of which can facilitate the flow of air inside and outside the gearbox, balance the pressure inside and outside the gearbox, and also prevent some impurities from entering the gearbox.

[0048] Please refer to Figure 2 and Figure 3 In this embodiment, the venting device for the gearbox also includes an oil guide hole 30. The oil guide hole 30 is formed on the fixed structure 200 of the gearbox. The two ends of the oil guide hole 30 are respectively connected to the bottom of the bent channel 11 away from the venting member 20 and the inside of the gearbox. After the lubricating oil and oil vapor in the venting channel 10 are cooled, they can also flow back to the inside of the gearbox through the oil guide hole 30 to avoid the problem of blockage of the venting channel 10 caused by the accumulation of lubricating oil and oil vapor in the venting channel 10 after cooling.

[0049] Specifically, along the bottom of the bent channel 11 to the inside of the gearbox, the oil guide hole 30 is inclined away from the vent 20, that is, the oil guide hole 30 extends inclined downward from the bottom of the bent channel 11 into the gearbox, which facilitates the flow of lubricating oil and cooled oil vapor in the vent channel 10.

[0050] This embodiment also provides a wind turbine gearbox, which includes a fixed structure 200 and a venting device for the gearbox as described in any of the above embodiments. The venting device for the gearbox is disposed on the fixed structure 200. By using the venting device for the gearbox, the wind turbine gearbox can not only achieve pressure balance inside and outside the gearbox, but also reduce the number of replacements and maintenance of the venting component 20, improve the service life of the venting component 20, and has a simple structure, low cost, and does not affect the appearance of the wind turbine gearbox.

[0051] 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. Breather device for a gear box, characterized in that The application relates to a ventilation device for a gear box. The ventilation device comprises a ventilation passage (10) and a ventilation member (20). The ventilation passage (10) is arranged on a fixed structure (200) of the gear box and communicates the inside and outside of the gear box.

2. The venting arrangement for a gear case of claim 1, wherein, The ventilation passage (10) comprises at least one bent passage (11).

3. The venting arrangement for a gear case of claim 1, wherein, The ventilation member (20) is arranged on the outside of the gear box and is sealingly connected to the ventilation passage (10).

4. The venting arrangement for a gear case of claim 1, wherein, The bent passage (11) is provided with one, and the ventilation passage (10) further comprises a straight passage (12).

5. The venting arrangement for a gear case of claim 1, wherein, The two ends of the straight passage (12) are sealingly connected to the ventilation member (20) and the bent passage (11) respectively.

6. The venting arrangement for a gear case of claim 1, wherein, The length of the straight passage (12) is greater than that of the bent passage (11).

7. The venting arrangement for a gear case of claim 1, wherein, The bent passage (11) is provided with multiple, and the multiple bent passages (11) are sequentially and communicatively arranged.

8. The venting arrangement for a gear case according to any one of claims 1-7, characterized in that, The ventilation passage (10) and the ventilation member (20) are threadedly connected.

9. A venting arrangement for a gear box according to claim 8, characterised in that, The ventilation passage (10) and the ventilation member (20) are provided with a sealing member to realize sealing connection.

10. A wind turbine gearbox, characterised in that The ventilation passage (10) is formed by casting or drilling. The ventilation member (20) is a ventilation cap or an air filter. The ventilation device further comprises an oil guide hole (30) arranged on the fixed structure (200) of the gear box. The two ends of the oil guide hole (30) are respectively connected to the bottom of the bent passage (11) far away from the ventilation member (20) and the inside of the gear box. The oil guide hole (30) is arranged to be inclined to the direction far away from the ventilation member (20) from the bottom of the bent passage (11) to the inside of the gear box. The application further relates to a gear box comprising a fixed structure (200) and the ventilation device for the gear box as claimed in any one of claims 1-9.

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