Oil mist leakage prevention mechanism for gear box

Abstract

The utility model relates to an oil mist leakage prevention mechanism for a gear box, an output shaft of the gear box extends and penetrates through an end cover and is surrounded and sealed by the end cover in a non-contact mode, the oil mist leakage prevention mechanism comprises an air flow guide part, an oil mist leakage prevention part and an oil mist leakage prevention part, the air flow guide part is arranged on the axial outer side of the end cover and is closely adjacent to the end cover to be fixedly connected to the output shaft, and the air flow guide part and the output shaft rotate integrally; the oil mist guide channel is constructed to be communicated with the space where the airflow guide piece is located at the inlet and guide the oil mist-containing gas guided by the airflow guide piece; and the gas filter is arranged at the outlet of the oil mist guide channel and is configured to filter the oil mist in the oil mist-containing gas guided in the oil mist guide channel. By means of the oil mist leakage prevention mechanism, oil mist leakage can be prevented, guiding of gas from one side of the motor is facilitated, and cooling of the motor is optimized.

Description

Technical Field

[0001] The utility model generally relates to an oil mist leakage prevention mechanism for a gear box. Background Art

[0002] As is known, a gearbox, especially a wind power generation gearbox, is usually connected to a motor (more specifically, a generator) via an output shaft to make the structure of the entire wind power generation installation more compact.

[0003] It is known that in order to ensure the normal operation of each component of the gearbox, it is usually necessary to lubricate each relative displacement (e.g., rotating) component in the gearbox so that each component of the gearbox can maintain rigidity and reduce wear even at high speed. For the gearbox and the motor to which the gearbox is connected, due to differences in structure, material, movement speed, etc., the lubricating materials or lubricating oil components used for the gearbox and the motor to which the gearbox is connected are usually significantly different, so it is necessary to avoid mixing between different lubricating materials. In addition, since the lubricating material or lubricating oil is heated during lubrication (due to the heat generated by friction), the lubricating material or lubricating oil is usually atomized and forms oil mist and may escape from the gearbox and pollute the surrounding environment or enter the motor. However, the oil mist leakage problem occurring at the output shaft of the gearbox has not been satisfactorily solved.

[0004] At present, in order to prevent the lubricating oil or lubricating material from flowing out, a contact seal, such as a skeleton oil seal, is usually used between the output shaft of the gearbox and the housing of the gearbox (especially the end cover on one side of the output shaft). However, as a wearing part, the contact seal will fail after running for a period of time, and it needs to be replaced. Obviously, if it is replaced, the gearbox needs to be separated from the motor, especially in the case of wind power generation, this operation needs to be performed on the wind tower. Obviously, the operation is difficult and costly. Although non-contact seals can be used instead of contact seals to avoid such failures and avoid such disassembly of the gearbox as much as possible, it is obviously difficult to avoid the oil mist from the gearbox from leaking into the motor.

[0005] Therefore, there is a need for a method that can ensure that any possible lubricating material or lubricating oil between the output shaft of the gearbox and the housing of the gearbox can flow out while further preventing the leakage of oil mist using a non-contact seal. Utility Model Content

[0006] The utility model relates to an oil mist leakage prevention mechanism for a gear box, the gear box comprising an output shaft, the output end of the output shaft being connected to the input end of a motor, and characterized in that the housing of the gear box comprises an end cover on a side close to the output end to close the housing, the output shaft extends through a through hole of the end cover, the output shaft is constructed to be surrounded and sealed by the inner side of the through hole in a non-contact manner, the oil mist leakage prevention mechanism comprises an airflow guide, which is fixedly connected to the output shaft adjacent to the end cover on the axial outer side of the end cover and is constructed to rotate integrally with the output shaft; an oil mist guide channel, which is constructed to be connected to the space where the airflow guide is located at the inlet, and the airflow guide guides the leaked oil mist-containing gas to the inlet of the oil mist guide channel; and a gas filter, which is arranged at the outlet of the oil mist guide channel and is constructed to filter the oil mist in the oil mist-containing gas guided in the oil mist guide channel.

[0007] Optionally, the end cover includes a recessed portion arranged around the output shaft on the axial outer side thereof to accommodate the airflow guide, so that the airflow guide arranged in the recessed portion is kept within the axial outermost side of the end cover.

[0008] Optionally, the channel of the oil mist guide channel is penetrated in the end cover and the outlet is arranged in the circumferential edge of the end cover.

[0009] Optionally, the inlet of the oil mist guide passage extends over at least half of the circumference of the bottom in the recess, and further, the passage of the oil mist guide passage also extends over at least half of the axial side area of ​​the end cover.

[0010] Optionally, the airflow guide is constructed as a fan-shaped structure, which includes a central ring body, which surrounds and is closely connected to the output shaft; and fans, which are distributed around the central ring body and can blow and guide the leaked oil mist-containing gas toward the inlet of the oil mist guide channel when rotating.

[0011] Optionally, the airflow guide also includes a fan blade ring, which is constructed to extend along the outer peripheral side of the connecting fan blades to form an annular ring body; and a guide ring, which is constructed to protrude and extend along the axial inner peripheral edge of the central ring body toward one side of the end cover, wherein the guide ring and the fan blade ring are constructed to extend generally in parallel, and the inlet leads to the space between the guide ring and the fan blade ring.

[0012] Optionally, the guide ring is configured to expand and extend from its base away from the central ring body, so that the outer edge of the guide ring is close to the bottom of the recess and covers more than half of the area of ​​substantially the entire bottom.

[0013] Optionally, the oil mist leakage prevention mechanism also includes a condensed oil flow channel, which is configured to guide the condensed oil of the oil mist gas; and a condensed oil collector, which is configured to collect the condensed oil, wherein the condensed oil collector is connected to the outlet of the condensed oil flow channel and is located on the lower side of the gear box, and the condensed oil guide channel is connected to the space where the airflow guide is located, and the channel of the condensed oil guide channel is penetrated in the end cover.

[0014] Optionally, a threaded through hole is formed in a portion of the central ring body located radially inside the guide ring in the axial direction for fixed connection to the output shaft by means of bolts.

[0015] Optionally, the output shaft includes a flange protruding from the shaft body, the flange including a radially protruding ring protruding radially outward from the shaft body, and an axial annular wall extending axially toward the end cover from the outer peripheral edge of the protruding ring, so that the axial annular wall can be shape-fitted and retained in a corresponding recess of the end cover to ensure non-contact sealing for the output shaft.

[0016] By means of the oil mist leakage prevention mechanism for the gearbox of the present application, an active oil mist guide and an oil mist collection component (such as a filter) can be provided on the axial outer side of the non-contact seal so that any leaked gas from the gearbox can be guided to the oil mist collection component as much as possible, thereby preventing the oil mist from leaking to the motor and thus preventing the loss and contamination of lubricating oil or lubricating materials. In addition, by means of the oil mist leakage prevention mechanism of the present application, it is possible to help guide the gas from one side of the motor, help cool the motor, and help prevent impurities in the gas from possibly contaminating the gearbox side, thereby significantly saving possible filtering or blocking components between the gearbox and the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other advantages and aspects of the present application will become more apparent with reference to the following detailed description made with reference to the accompanying drawings, in which:

[0018] Figure 1 A perspective view showing a portion of a gearbox including an oil mist leakage prevention mechanism according to an embodiment of the present utility model;

[0019] Figure 2 A longitudinal sectional view showing the portion of the gearbox including the oil mist leakage prevention mechanism according to an embodiment of the present invention; and

[0020] Figure 3 A three-dimensional view of an airflow guide of an oil mist leakage prevention mechanism according to an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0021] Throughout the present application, the same reference numerals denote the same or similar elements or parts.

[0022] In describing the embodiments of the utility model, the axial direction corresponds to the front-to-rear direction of the normally arranged gearbox along its output shaft, wherein the direction in which the end of the output shaft connected to the motor is located is further defined as the front. The vertical direction corresponds to the up-and-down direction of the gearbox in normal placement, which is perpendicular to the longitudinal direction and is also generally collinear with the direction of gravity, wherein the direction away from gravity is further defined as upward. The radial direction is perpendicular to the axial direction and passes through the center of a circle around the axial direction on a plane perpendicular to the axial direction, and the circumferential direction is the peripheral direction around the axial direction. Although the definitions of directions used in this article are defined in detail herein, those skilled in the art should understand that these direction definitions are exemplary only, and those skilled in the art can flexibly define them according to their needs.

[0023] As shown in the attached figure, Figure 1 A perspective view of a portion of a gearbox 1 including an oil mist leakage prevention mechanism 10 according to an embodiment of the present invention is shown, and Figure 2 FIG. 1 is a longitudinal sectional view of the portion of the gearbox 1 including the oil mist leakage prevention mechanism 10 according to an embodiment of the present invention. Figure 1 and 2 The oil mist leakage prevention mechanism 10 for a gearbox 1 shown in the figure comprises an output shaft 12, the output end of the output shaft 12 is connected to the input end of the motor, the housing of the gearbox 1 comprises an end cover 14 on the side close to the output end to close the housing, the output shaft 12 extends through the through hole of the end cover 14, the output shaft 12 is configured to be surrounded and sealed by the inner side of the through hole in a non-contact manner, and the oil mist leakage prevention mechanism 10 comprises an airflow guide 1002, which is fixedly connected to the end cover 14 on the axial outer side of the end cover 14 to the output shaft 12 and is constructed to rotate integrally with the output shaft 12; an oil mist guide channel 1004, which is constructed to be connected to the space where the airflow guide 1002 is located at the inlet 1006, and the airflow guide 1002 guides the leaked oil mist-containing gas to the inlet 1006 of the oil mist guide channel 1004; and a gas filter 1008, which is arranged at the outlet 1010 of the oil mist guide channel 1004 and is constructed to filter the oil mist in the oil mist-containing gas guided in the oil mist guide channel.

[0024] As known to those skilled in the art, the output shaft 12 of the gearbox 1 can be connected to the motor by means of a coupling. With the oil mist leakage prevention mechanism 10 of the present application, it is possible to ensure that the lubricating oil or lubricating material liquid in the gearbox 1 will not leak and that the oil mist of the lubricating oil or lubricating material will not spread beyond the axial outer side of the end cover 14, while adopting a non-contact seal between the output shaft and the through hole of the end cover, thereby maximally preventing the oil mist from leaking into the motor to which the output shaft 12 of the gearbox 1 is connected and escaping into the surrounding atmosphere to cause pollution.

[0025] exist Figure 1 and 2 In the embodiment shown, the airflow guide 1002 is constructed to guide the leaked oil mist gas to the inlet 1006 of the oil mist guide channel 1004 by rotating with the output shaft 12 to generate a guide airflow such as blowing to ensure that it does not escape to the axial outside of the end cover. Since the airflow guide 1002 is rotated by means of a fixed connection to the output shaft 12, the airflow guide 1002 can be added without changing the structure of the gearbox 1 and the end cover 14, which has a certain cost-effectiveness. Further, by means of the airflow guide 1002 fixedly connected to the output shaft 12 adjacent to the end cover 14 on the axial outside of the end cover 14, the airflow guide can help guide the airflow from one side of the motor toward the gearbox, thereby facilitating the airflow flow and cooling of the motor.

[0026] exist Figure 1 and 2 In the illustrated embodiment, the end cover 14 includes a recess 1402 arranged around the output shaft 12 on its axial outer side to accommodate the airflow guide 1002, so that the airflow guide 1002 arranged in the recess 1402 does not extend beyond the axial outermost side of the end cover 14 (that is, it remains within the outermost side). The size of the recess 1402 is configured to substantially accommodate the airflow guide 1002 so as to ensure that the connection of the gearbox 1 with other motors is not interfered. Of course, it is conceivable that an outer end cover (not shown) is arranged on the outer side of the end cover 14, and the outer end cover can be fixedly connected to the end cover of the gearbox in a substantially form-fitting manner, and the opening in the outer end cover for leading out the output shaft forms a hollow annular recess around the output shaft to accommodate the airflow guide so that the airflow guide does not extend out of the recess. Alternatively, such an outer end cover can realize the addition of such an airflow guide without changing the existing gearbox structure to adapt to various existing gearboxes.

[0027] exist Figure 1 and 2In the illustrated embodiment, in the case where the end cover 14 includes a recess 1402 arranged around the output shaft on its axial outer side, the channel of the oil mist guide channel 1004 is penetrated in the end cover 14 and the outlet 1010 is arranged in the circumferential edge of the end cover 14, especially on the upper side of the gearbox 1, of course, other directions are also possible. With the help of such an oil mist guide channel 1004, on the one hand, it is possible to concentrate the oil mist gas guided by the air flow guide 1002, and on the other hand, it is possible to achieve a balance of the pressure at the air flow guide 1002 to better guide the oil mist gas. Optionally, in the case where an outer end cover is arranged on the outer side of the end cover, the outer end cover can be fixedly connected to the end cover of the gearbox at a certain distance from the end cover in at least some parts, and these intervals form at least a part or all of the oil mist guide channel. In this case, in order to prevent the escape of the oil mist gas, an annular seal is arranged between the periphery of the outer end cover and the end cover. In addition, the outlet 1010 of the oil mist guide channel 1004 can be selectively arranged at the circumferential edge of the end cover, or can be selectively arranged at any possible external position of the gearbox as long as it can connect the atmosphere with the space where the airflow guide 1002 is located. Although the oil mist guide channel 1004 is described herein as a structure opened in the end cover 14 of the gearbox 1, it should be understood that the oil mist guide channel 1004 can be constructed as an additional pipeline structure independent of the end cover 14 without departing from the scope of the present application. In fact, the use of an additional pipeline structure may require the provision of an additional space in the end cover 14 to accommodate the pipeline structure, so as to ensure that the connection between the gearbox and other motor devices at the output shaft is not affected.

[0028] exist Figure 1 and 2 In the illustrated embodiment, when the end cover 14 includes a recess 1402 arranged around the output shaft on its axial outer side, the inlet 1006 of the oil mist guide channel 1004 extends on at least half of the periphery of the bottom of the recess 1402 (i.e., the surface of the end cover in the recess that is substantially perpendicular to the axial direction). Further, the channel of the oil mist guide channel 1004 can also be constructed to extend on at least half of the axial side area of ​​the end cover 14 (i.e., the end surface area of ​​the end cover). With this construction, it can be achieved that the airflow guide 1002 can guide the oil mist gas more easily and more widely into the oil mist guide channel 1004, and avoid as much as possible the situation that the guidance of the oil mist gas is blocked due to the inlet 1006 being too small or the channel being too small.

[0029] exist Figure 1 and 2In the illustrated embodiment, the oil mist leakage prevention mechanism 10 further includes a condensed oil flow channel 1012, which is configured to guide condensed oil originating from the oil mist-containing gas; and a condensed oil collector 1014, which is configured to collect the condensed oil, wherein the condensed oil collector 1014 is connected to the outlet of the condensed oil flow channel 1012 and is located at the lower side of the gearbox 1. Of course, the inlet of the condensed oil flow channel 1012 is also configured to be connected to the space where the airflow guide 1002 is located and is located at the lower side of the space, so that the condensed oil originating from the oil mist-containing gas can be automatically collected into the condensed oil guide channel 1012 by gravity and finally collected into the condensed oil collector 1014. Additionally or alternatively, the channel of the condensed oil guide channel 1012 is also penetrated in the end cover 14 to ensure less interference with the external structure of the gearbox. Of course, when an outer end cover is arranged outside the end cover, the outer end cover can be fixedly connected to the end cover of the gearbox at a certain distance from the end cover in a part of the lower part, and these distances form at least a part or all of the condensed oil guide channel.

[0030] like Figure 1-2 As shown, the output shaft 12 includes a flange 1202 protruding from the shaft body, and the flange 1202 includes a radially protruding ring 1204 protruding radially outward from the shaft body, and an axial annular wall 1206 extending axially from the outer peripheral edge of the protruding ring 1204 toward the end cover 14, so that the axial annular wall 1206 can be retained in a corresponding recess 1404 of the end cover 14 in a shape-fitting manner to ensure non-contact sealing of the output shaft 12. With this configuration, the effectiveness of the non-contact sealing of the output shaft 12 can be ensured, thereby ensuring the prevention of oil mist leakage from the source.

[0031] The following will refer to Figure 3 The exemplary structure of the airflow guide 1002 is described in detail. Those skilled in the art should understand that the following description is only exemplary and not restrictive. In fact, the airflow guide 1002 can be selected as any possible structure that can generate a blowing and guiding effect on the oil mist gas by moving together with the output shaft as described above. Figure 3 A three-dimensional view of an airflow guide 1002 of an oil mist leakage prevention mechanism according to an embodiment of the present invention is shown.

[0032] like Figure 3 As shown, the airflow guide 1002 is constructed as a fan-shaped structure, which includes a central ring body 1016, which surrounds and is closely connected to the output shaft 12; and fan blades 1018, which are distributed around the circumferential outer side of the central ring body 1016 and can blow and guide the leaked oil mist gas toward the inlet 1006 of the oil mist guide channel 1004 when rotating. Figure 1-3In the illustrated embodiment, the airflow guide 1002 is sleeved onto the output shaft 12 and the axial rear side of the central ring body 1016 is fitted to a step portion provided on the circumference of the output shaft 12. Of course, this is only exemplary, and the central ring body 1016 can be fixedly connected to the output shaft 12 in any possible manner without departing from the scope of the present application. Figure 3 In the embodiment, after the axial rear side of the central ring body 1016 is attached to the circumferential step portion of the output shaft, the airflow guide 1002 is fixed to the output shaft 12 by any possible fixing connection component. As will be understood by those skilled in the art, the blades 1018 are configured to be evenly distributed along the circumferential outer side of the central ring body 1016 to ensure the stability of the generated airflow and the stability of the moment.

[0033] like Figure 3 As shown, the airflow guide 1002 also includes a blade ring 1020, which is configured to extend from the outer peripheral side of the blade 1018 to form an annular ring body; and a guide ring 1022, which is configured to protrude and extend along the axial inner peripheral edge of the central ring body 1016 toward the end cover 14, wherein the guide ring 1022 and the blade ring 1020 are configured to extend substantially in parallel, and the inlet 1006 leads to the space between the guide ring 1022 and the blade ring 1020. With this structure, on the one hand, it is possible to effectively block the oil mist gas from the output shaft (for example, by means of the guide ring to achieve preliminary guidance of the oil mist gas), and on the other hand, it is possible to effectively orient the airflow direction generated by the airflow guide 1002, so that the flow orientation of the generated blowing airflow is more stable, thereby achieving the blowing guidance of the oil mist gas to the oil mist guide channel as much as possible. With the blade ring and / or the guide ring of the airflow guide, it is also possible to prevent the gas from the motor side from diffusing into the gearbox, thereby avoiding contamination. In fact, with the help of the segment ring and / or the guide ring, impurities in the gas from one side of the motor can be prevented from entering the gear box, so that the impurity filtering or blocking device arranged between the gear box and the motor in the prior art can be omitted.

[0034] like Figure 1-3 As shown, the guide ring 1022 is configured to expand and extend from its base away from the central ring body 1016 (in other words, to form a bowl-shaped structure or a truncated cone-shaped structure), so that the outer edge of the guide ring 1022 is close to the bottom of the recess 1402 and covers substantially the entire bottom area, for example, covers more than half of the entire bottom area. With this structure, on the one hand, effective blocking of the oil mist gas from the output shaft can be achieved, and on the other hand, better guidance and orientation of the oil mist gas can be achieved.

[0035] like Figure 3As shown, in this embodiment, a threaded through hole 1024 is provided in the axial direction in the portion of the central ring body 1016 located radially inside the guide ring 1022 for fixed connection to the output shaft by means of bolts. As mentioned above, after the axial rear side of the central ring body 1016 is attached to the circumferential step portion of the output shaft 12, the airflow guide is fixed to the output shaft by means of any of the bolts. However, this fixed connection method is only exemplary, and it is conceivable to use any possible connection device such as a snap-on connection device, an adhesive device, etc. to achieve fixed connection between the airflow guide 1002 and the output shaft 12.

[0036] The above embodiments described in this application are merely exemplary and non-restrictive. A person skilled in the art should understand that various modifications can be made to the above embodiments according to the disclosure of this application without departing from the scope of this application, and these modifications or equivalents also fall within the scope of protection of this application.

Claims

1. An anti-oil mist leakage mechanism for a gearbox, the gearbox comprising an output shaft, the output end of the output shaft being connected to the input end of a motor, characterized in that: The housing of the gearbox includes an end cover on a side close to the output end to close the housing, the output shaft extends through the through hole of the end cover, and the output shaft is configured to be surrounded and sealed by the end cover in a non-contact manner, and the oil mist leakage prevention mechanism includes: an airflow guide, which is fixedly connected to the output shaft adjacent to the end cover at the axial outer side of the end cover and is configured to rotate integrally with the output shaft; an oil mist guide passage configured to communicate at an inlet with a space where the airflow guide is located, and the airflow guide guides the leaked oil mist-containing gas to the inlet of the oil mist guide passage; and The gas filter is disposed at the outlet of the oil mist guide passage and is configured to filter the oil mist in the oil mist-containing gas guided in the oil mist guide passage.

2. The oil mist leakage prevention mechanism according to claim 1, characterized in that: The end cover includes a recessed portion disposed around the output shaft at an axial outer side thereof to accommodate the airflow guide, so that the airflow guide disposed in the recessed portion is maintained within the axial outermost side of the end cover.

3. The oil mist leakage prevention mechanism according to claim 1, characterized in that: The passage of the oil mist guide passage is penetrated in the end cover and the outlet is arranged in the circumferential edge of the end cover.

4. The oil mist leakage prevention mechanism according to claim 2, characterized in that: The inlet of the oil mist guide passage extends over at least half of the circumference of the bottom in the recess, and the passage portion of the oil mist guide passage also extends over at least half of the axial side surface area of ​​the end cover.

5. The oil mist leakage prevention mechanism according to claim 2, characterized in that: The airflow guide is configured as a fan-shaped structure, which includes a central ring body, which surrounds and is closely connected to the output shaft; and fan blades, which are distributed around the circumferential outer side of the central ring body and can blow and guide the leaked oil mist-containing gas toward the inlet of the oil mist guide channel when rotating with the output shaft.

6. The oil mist leakage prevention mechanism according to claim 5, characterized in that: The airflow guide also includes a blade ring, which is configured to connect the outer periphery of the blades to form an annular ring body; and a guide ring configured to protrude and extend around the radial inner periphery of the central ring body toward one side of the end cover, wherein the guide ring and the sector ring are configured to extend substantially in parallel, and the inlet leads to a space between the guide ring and the sector ring.

7. The oil mist leakage prevention mechanism according to claim 6, characterized in that: The guide ring is configured to expand and extend from a base thereof away from the central ring body, so that an outer edge of the guide ring is close to a bottom of the recess and covers more than half of a total area of ​​the bottom.

8. The oil mist leakage prevention mechanism according to claim 1, characterized in that: The oil mist collecting mechanism also includes a condensed oil flow channel, which is configured to guide the condensed oil of the oil mist-containing gas; and a condensed oil collector, which is configured to collect the condensed oil, wherein the condensed oil collector is connected to the outlet of the condensed oil flow channel and is located on the lower side of the gear box, and the condensed oil guiding channel is connected to the space at the lower side of the space where the airflow guide is located.

9. The oil mist leakage prevention mechanism according to claim 6, characterized in that: A threaded through hole is formed in a portion of the central ring body located radially inside the guide ring in an axial direction so as to be fixedly connected to the output shaft by means of bolts.

10. The oil mist leakage prevention mechanism according to claim 1, characterized in that: The output shaft includes a flange protruding from the shaft body, the flange includes a radially protruding ring protruding radially outward from the shaft body, and an axial annular wall extending axially from the outer peripheral edge of the protruding ring toward the end cover, so that the axial annular wall can be shape-fitted and retained in a corresponding recess of the end cover.

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