Sealing structure for wind power speed increaser and wind power speed increaser

Abstract

The present invention relates to the technical field of oil leakage prevention, and in particular to a sealing structure for a wind power speed increaser and a wind power speed increaser. The sealing structure comprises: a sealing ring and a box assembly; a mounting hole is provided on the box assembly; the sealing ring is installed in the mounting hole; a spiral groove is formed between the outer wall of the sealing ring and the inner wall of the mounting hole; the rotation direction of the spiral groove is opposite to the rotation direction of the sealing ring. The sealing structure for a wind power speed increaser provided by the present invention pushes the lubricating oil into the box by providing a spiral groove, thereby reducing the amount of lubricating oil flowing out of the box, reducing the amount of oil leakage, and improving the sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of oil leakage prevention, and in particular to a sealing structure for a wind power speed increaser and a wind power speed increaser. Background Art

[0002] The wind power speed increaser is used in wind turbines and has the characteristics of small size, high load-bearing capacity, long service life, stable operation, low noise, and reasonable temperature rise control. The wind power speed increaser includes a housing and a rotating shaft arranged on the housing. A sealing ring is arranged between the rotating shaft and the inner wall of the housing. The sealing ring rotates relative to the housing with the rotating shaft. The inner wall of the housing is provided with a first oil return groove, a second oil return groove, and a third oil return groove. The first oil return groove, the second oil return groove, and the outer wall of the sealing ring form a first oil return chamber, a second oil return chamber, and a third oil return chamber. Located inside the housing, a bearing is arranged on the outer wall of the rotating shaft. Lubricating oil is introduced into the bearing through the oil distribution ring groove. Part of the excess lubricating oil on the bearing flows back to the housing, and part flows into the first oil return chamber. The excess lubricating oil in the first oil return chamber flows into the second oil return chamber and the third oil return chamber for storage.

[0003] However, when the amount of lubricating oil is relatively large and the oil return passages of the first, second and third oil return chambers are not large enough, it is easy for the gear oil to accumulate in each oil return chamber and then flow out of the box body, resulting in oil leakage. Summary of the invention

[0004] The purpose of the present invention is to provide a sealing structure for a wind power speed increaser and a wind power speed increaser, so as to solve the technical problems of serious oil leakage and poor sealing effect of the wind power speed increaser in the prior art.

[0005] The present invention provides a sealing structure for a wind power speed increaser, which comprises: a sealing ring and a box assembly; the box assembly is provided with a mounting hole; the sealing ring is installed in the mounting hole; a spiral groove is formed between the outer wall of the sealing ring and the inner wall of the mounting hole; the rotation direction of the spiral groove is opposite to the rotation direction of the sealing ring.

[0006] Furthermore, the spiral groove is arranged on the outer wall of the sealing ring.

[0007] Furthermore, a first oil return groove and a second oil return groove, both of which are connected to the interior of the box assembly, are arranged at intervals on the inner wall of the mounting hole; the second oil return groove is located on the side of the first oil return groove away from the interior of the box assembly; part of the spiral groove is located in the first oil return groove, and part of it is located in the second oil return groove.

[0008] Furthermore, a buffer groove is provided on the inner wall of the mounting hole; the buffer groove is located on the side of the second oil return groove away from the first oil return groove; a first positioning protrusion is provided on the outer wall of the sealing ring; the first positioning protrusion is located in the buffer groove; the outer wall of the first positioning protrusion is spaced 0.8-1.0 mm from the bottom wall of the buffer groove.

[0009] Furthermore, a third oil return groove connected to the interior of the box assembly is provided on the inner wall of the mounting hole; in the direction from the inside to the outside of the box assembly, the first oil return groove, the second oil return groove and the third oil return groove are arranged in sequence at intervals; on the outer wall of the sealing ring, located in the third oil return groove, an annular oil throwing groove is provided.

[0010] Furthermore, a sealing groove is provided on the inner wall of the mounting hole; the sealing groove is located at an end of the third oil return groove away from the second oil return groove.

[0011] Furthermore, a second positioning protrusion is provided on the outer wall of the sealing ring, located in the third oil return groove; and the cross-sectional shape of the second positioning protrusion is a triangle.

[0012] Furthermore, an oil separation ring groove and a damping hole are provided on the inner wall of the mounting hole, between the first oil return groove and the second oil return groove; one end of the damping hole is connected to the oil separation ring groove, and the other end is connected to the oil inlet hole on the box assembly.

[0013] Further, the box assembly is provided with a first exhaust passage; one end of the first exhaust passage is communicated with the first oil return groove, and the other end is communicated with the interior of the box assembly;

[0014] And / or, the box assembly is provided with a second exhaust passage; one end of the second exhaust passage is communicated with the second oil return groove, and the other end is communicated with the interior of the box assembly;

[0015] And / or, a third exhaust passage is provided on the box assembly; one end of the third exhaust passage is communicated with the third oil return groove, and the other end of the third exhaust passage is communicated with the interior of the box assembly.

[0016] Furthermore, the present invention also provides a wind turbine speed increaser, which comprises: a rotating shaft and the sealing structure for the wind turbine speed increaser described in the present invention; the rotating shaft is inserted into the sealing ring.

[0017] The sealing structure for a wind power speed increaser provided by the present invention includes a sealing ring and a housing assembly. When in use, a rotating shaft is inserted into the sealing ring, and the sealing ring rotates with the rotating shaft. After the bearing in the housing assembly is lubricated with lubricating oil, a part of the excess lubricating oil flows back to the interior of the housing assembly, and a part flows to the outside of the housing assembly through a spiral groove. Since the rotation direction of the spiral groove is opposite to the rotation direction of the sealing ring, that is, the rotation direction of the spiral groove is opposite to the rotation direction of the rotating shaft, the sealing ring applies a force toward the interior of the housing assembly to the lubricating oil flowing into the spiral groove, thereby pushing the lubricating oil into the housing assembly, thereby reducing the lubricating oil from flowing into the oil return groove and flowing to the outside of the housing.

[0018] The sealing structure for a wind power speed increaser provided by the present invention pushes lubricating oil into the interior of the box body by arranging a spiral groove, thereby reducing the amount of lubricating oil flowing out of the box body, reducing the amount of oil leakage, and improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 is a partial structural schematic diagram of a sealing structure for a wind power speed increaser according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Another structural schematic diagram of a sealing structure for a wind power speed increaser is shown;

[0022] Figure 3 is a partial structural schematic diagram of a sealing structure for a wind power speed increaser according to another embodiment of the present invention;

[0023] Figure 4 yes Figure 3 Another structural schematic diagram of a sealing structure for a wind power speed increaser is shown.

[0024] In the figure:

[0025] 1-seal ring; 2-box assembly; 3-rotating shaft;

[0026] 4 - first oil return groove; 5 - spiral groove; 6 - second oil return groove;

[0027] 7 - first positioning protrusion; 8 - sealing gap; 9 - third oil return groove;

[0028] 10 - second positioning protrusion; 11 - oil-slinging groove; 12 - first exhaust passage;

[0029] 13 - third exhaust passage; 14 - second exhaust passage; 15 - oil distribution ring groove;

[0030] 16-damping hole; 21-box; 22-positioning ring;

[0031] 23-End cover. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Figure 1 is a partial structural schematic diagram of a sealing structure for a wind power speed increaser according to an embodiment of the present invention; Figure 2 yes Figure 1 Another structural schematic diagram of a sealing structure for a wind power speed increaser is shown; Figure 3 is a partial structural schematic diagram of a sealing structure for a wind power speed increaser according to another embodiment of the present invention; Figure 4 yes Figure 3 Another structural schematic diagram of a sealing structure for a wind turbine speed increaser is shown in FIG. Figures 1 to 4 As shown, an embodiment of the present invention provides a sealing structure for a wind turbine speed increaser, comprising: a sealing ring 1 and a box assembly 2; a mounting hole is provided on the box assembly 2; the sealing ring 1 is installed in the mounting hole; a spiral groove 5 is formed between the outer wall of the sealing ring 1 and the inner wall of the mounting hole; the rotation direction of the spiral groove 5 is opposite to the rotation direction of the sealing ring 1.

[0035] The sealing structure for a wind power speed increaser provided in an embodiment of the present invention comprises a sealing ring 1 and a housing assembly 2. When in use, the rotating shaft 3 is inserted into the sealing ring 1 and is connected with the sealing ring 1 by interference fit. The sealing ring 1 rotates with the rotating shaft 3. After the bearing in the housing assembly 2 is lubricated with lubricating oil, part of the excess lubricating oil flows back to the inside of the housing assembly 2, and part of the excess lubricating oil flows to the outside of the housing assembly 2 through the spiral groove 5. Since the rotation direction of the spiral groove 5 is opposite to the rotation direction of the sealing ring 1, that is, the rotation direction of the spiral groove 5 is opposite to the rotation direction of the rotating shaft 3, the sealing ring 1 applies a force toward the inside of the housing assembly 2 to the lubricating oil flowing into the spiral groove 5, thereby pushing the lubricating oil into the inside of the housing assembly 2, thereby reducing the amount of lubricating oil flowing into the oil return groove, and thus avoiding leakage of the lubricating oil. The sealing structure for a wind power speed increaser provided in an embodiment of the present invention pushes the lubricating oil into the inside of the housing 21 by setting the spiral groove 5, reduces the amount of lubricating oil flowing out of the housing 21, reduces the amount of oil leakage, and improves the sealing effect.

[0036] Among them, the first oil return groove 4, the second oil return groove 6 and the third oil return groove 9 are arranged in sequence on the inner wall of the mounting hole, and the first oil return groove 4, the second oil return groove 6 and the third oil return groove 9 and the outer wall of the sealing ring 1 respectively form the first oil return cavity, the second oil return cavity and the third oil return cavity. The spiral groove 5 can be arranged between the first oil return groove 4 and the second oil return groove 6, or between the second oil return groove 6 and the third oil return groove 9, or on the side of the first oil return groove 4 away from the second oil return groove 6, or on the side of the third oil return groove 9 away from the second oil return groove 6. The rotation direction of the spiral groove 5 is determined by the rotation direction of the sealing ring 1.

[0037] Furthermore, the spiral groove 5 may be provided on the outer wall of the sealing ring 1 or on the inner wall of the mounting hole.

[0038] Furthermore, an annular sealing gap 8 is provided on the inner wall of the box assembly 2 between the second oil return groove 6 and the third oil return groove 9. The sealing gap 8 can reduce the leakage of lubricating oil from the second oil return groove 6 into the third oil return groove 9. Figure 1 and Figure 2 As shown, on the basis of the above embodiment, further, the spiral groove 5 is arranged on the outer wall of the sealing ring 1 .

[0039] In this embodiment, the spiral groove 5 is arranged on the outer wall of the sealing ring. When in use, the spiral groove 5 rotates in the mounting hole together with the sealing ring 1, and the sealing ring 1 pushes the lubricating oil along the spiral groove 5 to the inside of the box body 21. The structure is stable and easy to process.

[0040] On the basis of the above embodiments, further, a first oil return groove 4 and a second oil return groove 6, both of which are connected to the interior of the box assembly 2, are arranged at intervals on the inner wall of the mounting hole; the second oil return groove 6 is located on the side of the first oil return groove 4 away from the interior of the box assembly 2; part of the spiral groove 5 is located in the first oil return groove 4, and part of it is located in the second oil return groove 6.

[0041] In this embodiment, the first oil return groove 4 and the second oil return groove 6 are provided on the mounting hole, and the first oil return groove 4 and the second oil return groove 6 respectively form the first oil return cavity and the second oil return cavity with the outer wall of the sealing ring 1. The spiral groove 5 is partially located in the first oil return groove 4 and partially located in the second oil return groove 6. When in use, the excess lubricating oil on the bearing enters the first oil return groove 4. When the lubricating oil in the first oil return groove 4 is full due to untimely oil return, the lubricating oil in the first oil return groove 4 flows into the second oil return groove 6. The setting of the spiral groove 5 can block the oil leakage from the first oil return groove 4 to the second oil return groove 6, and the oil in the second oil return groove 6 can be pumped to the first oil return groove 4, thereby further preventing the lubricating oil from flowing out of the housing 21 and avoiding the oil throwing phenomenon.

[0042] Among them, part of the spiral groove 5 is located in the first oil return groove 4, and part of it is located in the second oil return groove 6. One end of the spiral groove 5 can be located in the first oil return groove 4, and the other end is located in the second oil return groove 6. One end of the spiral groove 5 can extend out of the first oil return groove 4, and the other end can extend out of the second oil return groove 6. Alternatively, one end of the spiral groove 5 is located in the groove, and the other end is located outside the groove.

[0043] like Figure 1 and Figure 2 As shown, on the basis of the above embodiment, a buffer groove is further provided on the inner wall of the mounting hole; the buffer groove is located on the side of the second oil return groove 6 away from the first oil return groove 4; a first positioning protrusion 7 is provided on the outer wall of the sealing ring 1; the first positioning protrusion 7 is located in the buffer groove; the outer wall of the first positioning protrusion 7 and the bottom wall of the buffer groove are spaced 0.8-1.0 mm apart.

[0044] In this embodiment, the first oil return groove 4, the second oil return groove 6 and the buffer groove are arranged in sequence along the direction from the inside to the outside of the box body 21, the excess lubricating oil in the first oil return groove 4 enters the second oil return groove 6, and the excess lubricating oil in the second oil return groove 6 enters the buffer groove for buffering, and the interval between the first positioning protrusion 7 and the bottom wall of the buffer groove is 0.8-1.0mm. In this way, when the sealing ring 1 rotates at a high speed, the oil attached to the sealing ring 1 in the interval can be thrown outward by centrifugal force, thereby avoiding more lubricating oil attached to the sealing ring 1 and flowing out along the sealing ring 1, further improving the sealing effect.

[0045] The interval between the first positioning protrusion 7 and the bottom wall of the buffer groove may be 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, etc.

[0046] like Figure 1 and Figure 2 As shown, on the basis of the above embodiment, further, a third oil return groove 9 connected to the interior of the box assembly 2 is provided on the inner wall of the mounting hole; from the inside to the outside of the box assembly 2, the first oil return groove 4, the second oil return groove 6 and the third oil return groove 9 are arranged in sequence at intervals; on the outer wall of the sealing ring 1, located in the third oil return groove 9, an annular oil throwing groove 11 is provided.

[0047] In this embodiment, excess lubricating oil in the second oil return groove 6 enters the third oil return groove 9. Since the sealing ring 1 is provided with an oil-throwing groove 11, the sealing ring 1 can be prevented from crawling outward along the circumference due to the oil caused by the processing knife marks. That is, the oil-throwing groove 11 separates the knife marks. When the oil crawls to the oil-throwing groove 11, it will gather in the groove and be thrown out by centrifugal force.

[0048] Preferably, the cross-sectional shape of the oil-slinging groove 11 is semicircular, so that the lubricating oil can flow smoothly in the oil-slinging groove 11, and the lubricating oil can be quickly thrown out of the oil-slinging groove 11. The oil-slinging groove 11 can be one or more than two.

[0049] Furthermore, the box assembly 2 includes a box body 21 and an end cover 23 , and the third oil return groove 9 is disposed on the end cover 23 .

[0050] On the basis of the above embodiment, further, a sealing groove is provided on the inner wall of the mounting hole; the sealing groove is located at one end of the third oil return groove 9 away from the second oil return groove 6 .

[0051] In this embodiment, excess lubricating oil in the second oil return groove 6 enters the third oil return groove 9. The sealing groove in the third oil return groove 9 can prevent the oil in the third oil return groove 9 from leaking out due to high-speed splashing, thereby improving the sealing effect of the wind turbine speed increaser.

[0052] Preferably, the sealing groove is annular and is arranged along the circumference of the mounting hole.

[0053] like Figure 1 and Figure 2 As shown, based on the above embodiment, further, a second positioning protrusion 10 is provided on the outer wall of the sealing ring 1, located in the third oil return groove 9; the cross-sectional shape of the second positioning protrusion 10 is a triangle.

[0054] In this embodiment, a second positioning protrusion 10 is provided on the sealing ring 1, and the cross-section of the second positioning protrusion 10 is set to be triangular. Compared with the square protrusion in the related art, the triangle occupies a smaller volume, thereby reducing the volume occupied by the second positioning protrusion 10 in the third oil return groove 9 and increasing the oil storage capacity of the third oil return groove 9. At the same time, the outer diameter of the second positioning protrusion 10 is reduced to avoid oil stirring due to the outer diameter.

[0055] Preferably, the cross section of the second positioning protrusion 10 is a right triangle, so that a gap sealing groove can be formed with the side wall of the third oil return groove through the right angle side.

[0056] like Figure 3 and Figure 4 As shown, on the basis of the above embodiment, further, an oil separation ring groove 15 and a damping hole 16 are provided on the inner wall of the mounting hole, between the first oil return groove 4 and the second oil return groove 6; one end of the damping hole 16 is connected to the oil separation ring groove 15, and the other end is connected to the oil inlet hole on the box assembly 2.

[0057] In this embodiment, this embodiment is applicable to the low-speed end of the wind turbine speed increaser. At the low-speed end of the wind turbine speed increaser, the oil in the oil inlet hole passes through the damping hole 16 and the oil dividing ring groove 15 in turn to enter the bearing in the housing assembly for lubrication, and the excess lubricating oil enters the first oil return groove. One side of the oil dividing ring groove 15 is the first oil return groove 4, and the other side is the second oil return groove 6. The damping hole 16 is arranged on the inner wall of the mounting hole, that is, arranged on the housing assembly 2, so that the oil dividing ring groove 15 is basically pressure-free, which can greatly reduce the amount of oil leaking from the gap of the outer ring of the oil dividing ring to the second oil return groove 6.

[0058] like Figure 2 As shown, based on the above embodiment, further, a first exhaust passage 12 is provided on the box assembly 2; one end of the first exhaust passage 12 is communicated with the first oil return groove 4, and the other end is communicated with the interior of the box assembly 2;

[0059] And / or, the box assembly 2 is provided with a second exhaust passage 14; one end of the second exhaust passage 14 is communicated with the second oil return groove 6, and the other end is communicated with the interior of the box assembly 2;

[0060] And / or, a third exhaust passage 13 is provided on the box assembly 2 ; one end of the third exhaust passage 13 is communicated with the third oil return groove 9 , and the other end is communicated with the interior of the box assembly 2 .

[0061] In this embodiment, the first oil return groove 4 is connected to the inside of the box assembly 2 through the first exhaust passage 12, so that the pressure of the first oil return groove 4 is the same as the internal pressure of the box, so that the oil return of the first oil return groove 4 is smoother. Similarly, the second oil return groove 6 is connected to the inside of the box assembly 2 through the second exhaust passage 14, so that the pressure of the second oil return groove 6 is the same as the internal pressure of the box, so that the oil return of the second oil return groove 6 is smoother. The third oil return groove 9 is connected to the inside of the box assembly 2 through the third exhaust passage 13, so that the pressure of the third oil return groove 9 is the same as the internal pressure of the box, so that the oil return of the third oil return groove 9 is smoother.

[0062] On the basis of the above embodiment, the embodiment of the present invention further provides a wind turbine speed increaser, which includes: a rotating shaft 3 and a sealing structure for a wind turbine speed increaser provided by the present invention; the rotating shaft 3 is inserted into the sealing ring 1. The principle of the sealing structure is the same as above and will not be repeated here.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing structure for a wind power speed increaser, characterized in that: include: A sealing ring and a box assembly; a mounting hole is provided on the box assembly; the sealing ring is installed in the mounting hole; a spiral groove is formed between the outer wall of the sealing ring and the inner wall of the mounting hole; the rotation direction of the spiral groove is opposite to the rotation direction of the sealing ring; The inner wall of the mounting hole is provided with a first oil return groove, a second oil return groove and a third oil return groove which are all connected to the interior of the box assembly. From the interior to the exterior of the box assembly, the first oil return groove, the second oil return groove and the third oil return groove are sequentially arranged at intervals. An annular oil-slinging groove is provided on the outer wall of the sealing ring, located in the third oil return groove, and the oil-slinging groove is sunken in the outer wall of the sealing ring; a second positioning protrusion is provided on the outer wall of the sealing ring, located in the third oil return groove; the cross-sectional shape of the second positioning protrusion is a right triangle; A buffer groove is provided on the inner wall of the mounting hole; the buffer groove is located on the side of the second oil return groove away from the first oil return groove; a first positioning protrusion is provided on the outer wall of the sealing ring; the first positioning protrusion is located in the buffer groove; the outer wall of the first positioning protrusion is spaced 0.8-1.0 mm from the bottom wall of the buffer groove; A sealing groove is arranged on the inner wall of the mounting hole, and the sealing groove is formed by the right-angle side of the second positioning protrusion and the side wall of the three-return oil groove.

2. The sealing structure for a wind power speed increaser according to claim 1, characterized in that: The spiral groove is arranged on the outer wall of the sealing ring.

3. The sealing structure for a wind power speed increaser according to claim 1, characterized in that: A portion of the spiral groove is located in the first oil return groove, and a portion of the spiral groove is located in the second oil return groove.

4. The sealing structure for a wind power speed increaser according to claim 3, characterized in that: An oil separation ring groove and a damping hole are provided on the inner wall of the mounting hole, between the first oil return groove and the second oil return groove; one end of the damping hole is connected to the oil separation ring groove, and the other end is connected to the oil inlet hole on the box assembly.

5. The sealing structure for a wind power speed increaser according to claim 3, characterized in that: The box assembly is provided with a first exhaust passage; one end of the first exhaust passage is communicated with the first oil return groove, and the other end is communicated with the interior of the box assembly; And / or, the box assembly is provided with a second exhaust passage; one end of the second exhaust passage is communicated with the second oil return groove, and the other end is communicated with the interior of the box assembly; And / or, a third exhaust passage is provided on the box assembly; one end of the third exhaust passage is communicated with the third oil return groove, and the other end of the third exhaust passage is communicated with the interior of the box assembly.

6. A fan speed increaser, characterized in that: include: A rotating shaft and a sealing structure for a wind power speed increaser as claimed in any one of claims 1 to 5; The rotating shaft is arranged inside the sealing ring.

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