CN217440531U - Wind generating set main shaft provided with shaft shoulder unloading groove - Google Patents
Wind generating set main shaft provided with shaft shoulder unloading groove Download PDFInfo
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- CN217440531U CN217440531U CN202220732497.6U CN202220732497U CN217440531U CN 217440531 U CN217440531 U CN 217440531U CN 202220732497 U CN202220732497 U CN 202220732497U CN 217440531 U CN217440531 U CN 217440531U
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Abstract
The utility model provides a be provided with wind generating set main shaft of shaft shoulder off-load groove, include: a first shaft section (1) for interference connection with an inner ring of a main bearing; a second shaft section (2) adjacent to the first shaft section (1) in the direction of the central axis of the main shaft; the second shaft section (2) is provided with a shaft shoulder end surface (3) at one side close to the first shaft section (1), and the shaft shoulder end surface (3) is used for being in contact with the end surface of the inner ring of the main bearing; the second shaft section (2) is provided with an unloading groove (4) at one side close to the first shaft section (1), and the opening of the unloading groove (4) faces the first shaft section (1). According to the wind generating set main shaft provided with the shaft shoulder unloading groove, the unloading groove is formed in the shaft shoulder, so that the stress concentration area possibly formed at the root of the shaft shoulder by the main shaft structure can be reduced, and the damage to the main shaft structure is avoided.
Description
Technical Field
The utility model relates to a wind power generation technical field particularly, relates to a wind generating set main shaft that is provided with shaft shoulder off-load groove.
Background
Wind energy is increasingly paid more attention to governments and enterprises of various countries as a renewable pollution-free clean energy source. Generally, wind power is used to generate electricity by building wind power plants on land and at sea. And a wind power plant needs to install a large number of wind generating sets.
A main shaft in the wind generating set is a key component of the wind generating set, and can bear larger force load and moment load in the working process. In the case of extreme weather such as typhoon, rainstorm, sand storm, etc., the ultimate load borne by the main shaft is greater.
Stress concentration areas inevitably occur on the main shaft structure. If in the stress concentration area, the stress concentration phenomenon exists for a long time, the main shaft structure can generate strength damage and fatigue damage, and other parts connected with the main shaft structure can be damaged, so that the normal work of the wind generating set is influenced.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a be provided with wind generating set main shaft of shaft shoulder off-load groove to the main shaft that reduces among the prior art structurally has stress concentration region's problem.
The utility model provides a be provided with wind generating set main shaft of shaft shoulder off-load groove, include: a first shaft section 1 for interference connection with an inner ring of a main bearing; a second shaft segment 2 adjacent to the first shaft segment 1 in a central axis direction of the main shaft; the second shaft section 2 is provided with a shaft shoulder end surface 3 at one side close to the first shaft section 1, and the shaft shoulder end surface 3 is used for contacting with the end surface of the inner ring of the main bearing; the second shaft section 2 is further formed with a relief groove 4 at a side close to the first shaft section 1, and an opening of the relief groove 4 faces the first shaft section 1.
In some embodiments, the relief groove 4 forms an annular recessed cavity 5 inside the second shaft section 2.
In some embodiments, the bottom of the relief groove 4 extends from the shoulder end surface 3 towards the surface of the first shaft section 1.
In some embodiments, the relief groove 4 is formed with the central axis of the main shaft as a revolution axis and with a generatrix 6 revolved.
In some embodiments, the bus bar 6 includes a first arcuate segment 61 having a first curvature value, a second arcuate segment 62 having a second curvature value.
In some embodiments, the first arcuate segment 61 is adapted to be coupled to the shoulder end face 3.
In some embodiments, the second arcuate segment 62 is adapted to interface with a surface of the first shaft segment 1.
In some embodiments, the first curvature value is not less than the second curvature value.
In some embodiments, the bus bar 6 further comprises at least one arcuate segment connecting the first arcuate segment 61 and the second arcuate segment 62.
In some embodiments, the height of the relief groove 4 in a direction perpendicular to the central axis of the main shaft is smaller than the height of the contact of the shoulder end surface 3 with the end surface of the inner ring of the main bearing.
The utility model provides a be provided with wind generating set main shaft of shaft shoulder off-load groove sets up the off-load groove in shaft shoulder department, can reduce the stress concentration region that the main shaft structure probably formed at the root of shaft shoulder, is favorable to avoiding causing the damage of main shaft structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a front view of a main shaft of a wind turbine generator system according to an embodiment of the present invention;
fig. 2 is an AA-direction cross-sectional view of the main shaft of the wind turbine generator system provided with the shoulder unloading groove according to the embodiment of the present invention;
FIG. 3 is an enlarged isometric view of FIG. 2 in the region of the shoulder relief groove;
FIG. 4A is an enlarged isometric view of FIG. 3 in the region of the shoulder relief groove;
FIG. 4B is another enlarged isometric view of FIG. 3 in the region of the shoulder relief groove.
Description of reference numerals: 1. a first shaft section; 2. a second shaft section; 3. a shoulder end surface; 4. an unloading slot; 5. a cavity; 6. a bus bar; 61. a first arcuate segment; 62. a second arcuate segment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
Stress concentration areas inevitably occur on the main shaft structure. At present, the stress concentration degree of a stress concentration area on a main shaft of a wind generating set with a larger power level is reduced by generally increasing the diameter of the main shaft, increasing the diameter or length of a local shaft section, or replacing a material with higher strength, so as to increase the fatigue strength of the main shaft.
As wind turbine generator systems are developed to higher power levels, the limit load borne by the main shaft is larger and larger, the range of the stress concentration area is larger and larger, or more stress concentration areas exist, so that the strength requirement on the main shaft is continuously increased. The stress concentration phenomenon on the main shaft is more and more obvious, the more efficient unit application of the wind generating set is limited, and the service life of the main shaft of the wind generating set is also shortened.
The utility model discloses be provided with wind generating set main shaft of shaft shoulder off-load groove sets up the off-load groove in shaft shoulder department, can reduce the stress concentration region that the main shaft structure probably formed at the root of shaft shoulder, is favorable to avoiding causing the damage of main shaft structure.
As shown in fig. 1 and fig. 2, the utility model discloses wind generating set main shaft includes: a first shaft section 1 for interference connection with an inner ring of a main bearing; a second shaft segment 2 adjacent to the first shaft segment 1 in a direction of a central axis C of the main shaft; the second shaft section 2 is provided with a shaft shoulder end surface 3 at one side close to the first shaft section 1, and the shaft shoulder end surface 3 is used for contacting with the end surface of the inner ring of the main bearing; the second shaft section 2 is further formed with an unloading groove 4 at a side close to the first shaft section 1, and an opening of the unloading groove 4 faces the first shaft section 1.
In the above, the first shaft segment 1 is for interference fit with the inner ring of the main bearing. The main bearing is arranged behind the first shaft section 1 on the main shaft, and the first shaft section 1 is fixedly connected with an inner ring of the main bearing. Under the transmission of torque from the front end component, the main shaft rotates, the inner ring of the main bearing rotates along with the main shaft, and the rollers of the main bearing are driven to roll. At this time, the outer ring of the main bearing is fixedly connected with the shell or other parts, and when the inner ring of the main bearing rotates along with the main shaft, the outer ring of the main bearing and the shell or other parts are kept static.
And, in order to position the inner ring of the main bearing in the direction of the central axis C of the main shaft, the main shaft further comprises a second shaft section 2 adjacent to the first shaft section 1 in the direction of the central axis C of the main shaft, and the second shaft section 2 is formed with a shoulder end surface 3 on a side close to the first shaft section 1. The shaft shoulder end surface 3 is used for being in close contact with an end surface of an inner ring of the main bearing so as to position the inner ring of the main bearing in the direction of the central axis C of the main shaft. At this time, the first shaft segment 1 is different in radial dimension from the second shaft segment 2, and generally, the second shaft segment 2 is larger in radial dimension than the first shaft segment 1, and the second shaft segment 2 may be regarded as a shoulder region adjacent to the first shaft segment 1. In this way, the inner ring of the main bearing is not displaced in the radial direction or in the axial and circumferential directions from the main shaft.
On the main shaft of some types of wind generating sets, when the inner ring of the main bearing rotates along with the main shaft, the first shaft section 1 or the second shaft section 2 of the main shaft bears a large bending moment in a partial area above the central axis C and is in a tension state; the first shaft section 1 or the second shaft section 2 of the main shaft is subjected to a large bending moment in a partial region thereof located below the central axis C and is in a compressed state. On the other hand, the first shaft section 1 or the second shaft section 2 of the main shaft is subjected to a large static load in the radial direction thereof. And the large axial load and the large radial load are transmitted to the root part of the first shaft section 1 or the second shaft section 2 of the main shaft through the shaft shoulder end surface 3 by closely contacting with the end surface of the inner ring of the main bearing and interference fit with the inner ring of the main bearing. Thus, the root or lower region of the second shaft segment 2 of the main shaft adjacent to the first shaft segment 1 is a stress concentration region. While, as the spindle rotates, a region occupying approximately 60 to 90 degrees in the cross section of the spindle is continuously subjected to compressive stress above the central axis C.
For this purpose, the second shaft section 2 is further formed with a relief groove 4 on a side close to the first shaft section 1, and the relief groove 4 opens toward the first shaft section 1. At this moment, the unloading groove 4 is not in contact with the end face of the inner ring of the main bearing, so that the contact area is reduced, the contact stress is avoided, and the stress concentration phenomenon is reduced.
And in the region of the second shaft section corresponding to the shaft shoulder end surface 3 which is in contact with the end surface of the inner ring of the main bearing, the stress is uniformly distributed, and the maximum possible stress concentration is reduced.
In this way, the relief groove 4 forms an annular recessed cavity 5 in the interior of the second shaft section 2, which allows a part of the aforementioned stress concentration region to be removed from the interior of the second shaft section 2. When the shape and size parameters of the relief groove are well matched with the stress concentration distribution of the main shaft, the cavity 5 can completely remove the stress concentration region from the interior of the second shaft section 2.
Therefore, the unloading groove 4 can effectively remove the stress concentration area of the main shaft in the shaft shoulder area, so that the stress concentration phenomenon during the operation of the main shaft is reduced, and the main shaft or the wind generating set is prevented from being damaged greatly.
In some embodiments, as shown in fig. 2, the bottom of the relief groove 4 extends from the shoulder end face 3 towards the surface of the first shaft segment 1.
In some embodiments, as shown in fig. 3, the relief groove 4 is formed with the central axis of the main shaft as a revolution axis and with a generatrix 6 that revolves.
As shown in fig. 3, in the longitudinal section of the relief groove, the shape of the curve corresponding to the bottom of the relief groove is an irregular arc. Preferably, as shown in fig. 4A, the bus bar 6 includes a first arc section 61 having a first curvature value, a second arc section 62 having a second curvature value, the first arc section 61 is used for connecting with the shaft shoulder end surface 3, the second arc section 62 is used for connecting with the surface (being an outer cylindrical surface) of the first shaft section 1, and the first curvature value R1 is not less than the second curvature value R2. At this time, the first arc-shaped section 61 and the second arc-shaped section 62, which are connecting arcs connecting the end surface of the shoulder and the surface of the first shaft section 1, respectively, have centers determined by drawings, so that only the radius is noted in the case of dimensioning, and the position of the center is not noted. At this time, in the longitudinal section of the relief groove, the curve corresponding to the bottom of the relief groove is approximately in a semi-water drop shape or a water ladle shape, and the arc-shaped section 61 with a larger curvature is positioned on one side farther from the central axis of the main shaft or on one side closer to the inner ring of the main bearing. When the shape parameters and the size parameters of the unloading groove are adopted, the stress concentration area can be more completely removed from the inner part of the second shaft section 2.
In some embodiments, the bus bar 6 further comprises at least one arcuate segment connecting the first arcuate segment 61 and the second arcuate segment 62. In this way, the smooth connection between the first arc-shaped section 61 and the second arc-shaped section 62 is realized by using at least one arc-shaped section, so that the bus bar 6 is a smooth curve as a whole, which is beneficial to reducing the stress concentration area or the stress concentration level, and the processability of the main shaft is better.
In some embodiments, the height of the relief groove 4 in a direction perpendicular to the central axis of the main shaft is smaller than the height of the contact of the shoulder end surface 3 with the end surface of the inner ring of the main bearing. Preferably, as shown in fig. 4A, when a longitudinal section of the inner ring of the main bearing is shown by a dotted line frame, and an outer wall of the inner ring of the main bearing is indicated by F and an inner wall of the inner ring of the main bearing is indicated by G, a height L2 of the relief groove in the radial direction of the main shaft is smaller than a dimension of contact of the shoulder end surface 3 with an end surface of the inner ring of the main bearing (L1-L2).
Alternatively, as shown in fig. 4B, when a longitudinal section of the inner ring of the main bearing is shown by a dotted line box, and an outer wall of the inner ring of the main bearing is indicated by F and an inner wall of the inner ring of the main bearing is indicated by G, a height L2 of the relief groove in the radial direction of the main shaft is smaller than a dimension of contact of the shoulder end surface 3 with an end surface of the inner ring of the main bearing (L1-L2).
In this way, overall, the height L2 of the relief groove in the radial direction of the main shaft is less than fifty percent (50%) of the height of the contact between the shoulder end face 3 and the end face of the inner ring of the main bearing when the relief groove is not provided, and it is still possible to ensure that the inner ring of the main bearing is reliably positioned in the axial direction.
The utility model discloses be provided with wind generating set main shaft of shaft shoulder off-load groove sets up the off-load groove in shaft shoulder department, and the influence that uses this mode of off-load groove to cause the bulk strength performance of structure is very little, can keep main shaft bulk strength unchangeable basically, but can effectively get rid of stress concentration region's stress concentration phenomenon, simultaneously, also can avoid because weight gain and the economic cost that the change material brought.
To sum up, the utility model discloses in the wind generating set main shaft that is provided with shaft shoulder off-load groove, the utilization has open-ended off-load groove, effectively gets rid of the main shaft and corresponds the stress concentration phenomenon of position with the base bearing installation contact surface, is favorable to getting rid of the fatigue damage of corresponding position, consequently, is favorable to prolonging the life of wind generating set main shaft, improves whole generating set operating efficiency, reduces wind power plant operation and operation cost.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a be provided with wind generating set main shaft of shaft shoulder off-load groove which characterized in that includes:
a first shaft section (1) for interference connection with an inner ring of a main bearing;
a second shaft section (2) adjacent to the first shaft section (1) in the direction of the central axis of the main shaft;
the second shaft section (2) is provided with a shaft shoulder end surface (3) at one side close to the first shaft section (1), and the shaft shoulder end surface (3) is used for being in contact with the end surface of the inner ring of the main bearing;
the second shaft section (2) is provided with an unloading groove (4) at one side close to the first shaft section (1), and the opening of the unloading groove (4) faces the first shaft section (1).
2. Wind park spindle according to claim 1, wherein the relief groove (4) forms an annularly recessed cavity (5) inside the second shaft section (2).
3. Wind park spindle according to claim 1, wherein the bottom of the relief groove (4) extends from the shoulder end face (3) towards the surface of the first shaft section (1).
4. The wind turbine main shaft according to claim 1, wherein the relief groove (4) is formed in such a way that the central axis of the main shaft is a rotation axis and a generatrix (6) is rotated.
5. Wind park spindle according to claim 4, characterized in that the busbar (6) comprises a first arc-shaped section (61) having a first curvature value, a second arc-shaped section (62) having a second curvature value.
6. Wind park spindle according to claim 5, wherein the first arc-shaped section (61) is intended for connection with the shoulder end face (3).
7. Wind park spindle according to claim 5, wherein the second arc-shaped section (62) is intended for connection with a surface of the first shaft section (1).
8. Wind park main shaft according to claim 5, wherein the first curvature value is not smaller than the second curvature value.
9. Wind park spindle according to claim 5, wherein the busbar (6) further comprises at least one arc segment connecting the first arc segment (61) and the second arc segment (62).
10. Wind park main shaft according to claim 5, wherein the relief groove (4) has a height in a direction perpendicular to the centre axis of the main shaft which is smaller than the height of the contact of the shoulder end surface (3) with the end surface of the inner ring of the main bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220732497.6U CN217440531U (en) | 2022-03-30 | 2022-03-30 | Wind generating set main shaft provided with shaft shoulder unloading groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220732497.6U CN217440531U (en) | 2022-03-30 | 2022-03-30 | Wind generating set main shaft provided with shaft shoulder unloading groove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217440531U true CN217440531U (en) | 2022-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220732497.6U Active CN217440531U (en) | 2022-03-30 | 2022-03-30 | Wind generating set main shaft provided with shaft shoulder unloading groove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217440531U (en) |
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2022
- 2022-03-30 CN CN202220732497.6U patent/CN217440531U/en active Active
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