A large thrust sliding bearing for a wind tunnel large deflection, variable deflection compressor
By designing high-thrust sliding bearings for wind tunnel compressors with large and variable deflection that adapt to both static and dynamic deflection of the shaft, the problem of rapid damage to thrust bearings on long shafts has been solved, achieving stable operation and long service life of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENKE SLIDE BEARING
- Filing Date
- 2023-07-28
- Publication Date
- 2026-05-19
AI Technical Summary
Conventional thrust bearings cannot effectively adapt to the static and dynamic deflection of long shafts, leading to rapid damage to the thrust bearing, short service life, and inability to guarantee stable long-term operation of the equipment.
A high-thrust sliding bearing for wind tunnel large-deflection and variable-deflection compressors was designed, including components such as a rotating shaft, support frame, thrust disk, thrust pad, spherical pad, guide column, and elastic pad. By adjusting the thickness and structure of the guide column and elastic pad, it can adapt to the static and dynamic deflection of the rotating shaft, maintain the parallelism between the thrust pad surface and the thrust disk, and reduce the risk of vibration.
It effectively adapts to the static and dynamic deflection of heavy and long shafts, ensuring stable equipment operation and extending the service life of the thrust bearing.
Smart Images
Figure CN116816808B_ABST
Abstract
Description
Technical fields:
[0001] This invention relates to the technical field of bearing bushes, and more specifically to a high-thrust sliding bearing for wind tunnel compressors with large deflection and variable deflection. Background technology:
[0002] As one of the important supporting components in rotating machinery, sliding bearings are widely used in mechanical equipment such as motors, steam turbines, and compressors.
[0003] Thrust bearings are primarily used for axial positioning of shafts and to bear the axial loads of equipment. During equipment installation, the rotor undergoes elastic bending under its own weight or preload; this bending value is static deflection. During equipment operation, the rotating rotor undergoes elastic bending under unbalanced torques and other alternating forces; this bending value is dynamic deflection. To ensure smooth rotor operation, thrust bearings must effectively accommodate both static and dynamic rotor deflections.
[0004] However, when a shaft is more than 10 meters long, its excessive length and weight result in greater downward elastic bending deformation when placed horizontally, i.e., greater static deflection. At the same time, due to its heavy weight and long length, the rotation speed is relatively low. When running at this speed, the middle part of the shaft is always bent downward, i.e., the dynamic deflection is also large. In this case, when a conventional thrust bearing is used as a support, the excessive static and dynamic deflection will cause some of its thrust bearings to break too quickly, resulting in a short service life and making it impossible to achieve stable long-term operation of the equipment. Summary of the Invention:
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-thrust sliding bearing for wind tunnel large-deflection and variable-deflection compressors. It can adapt to the static deflection of heavy and long shafts, and at the same time, it can adapt well to the dynamic deflection of shafts, ensuring the parallelism of the thrust bearing surface and thrust disk during equipment operation, reducing the risk of vibration, and has a long service life.
[0006] The solution of the present invention to the aforementioned technical problem is:
[0007] A high-thrust sliding bearing for a wind tunnel high-deflection, variable-deflection compressor includes a rotating shaft and a ring-shaped support frame. The rotating shaft is inserted into a transverse through hole in the center of the support frame, and a thrust disc is provided on the outer wall of the middle part of the rotating shaft.
[0008] The left end face of the support frame is formed with an annular mounting groove, and the right side wall of the annular mounting groove is formed with multiple inner mounting grooves. Multiple thrust pads are located on the left side of the support frame. The right end face of the thrust pad is formed with a protrusion, which is inserted into the annular mounting groove of the support frame. The left end face of the thrust pad is close to the right end face of the thrust plate. The right end face of the protrusion is formed with a first mounting groove. A spherical pad is installed in the first mounting groove, and the right end face of the spherical pad extends out of the first mounting groove. A guide post and an elastic pad are installed in the corresponding inner mounting groove. The right end face of the elastic pad presses against the inner end face of the corresponding inner mounting groove, and the left end face of the elastic pad presses against the right end face of the corresponding guide post. The left end face of the guide post presses against the right end face of the corresponding spherical pad.
[0009] The right end face of the spherical pad has a raised extension extending to the right, and the right end face of the raised extension is spherical, which presses against the left end face of the corresponding guide post.
[0010] The spherical pad has multiple laterally extending stepped through holes. The rotating part of the fixing bolt is inserted into the large-diameter hole section at the right end of the stepped through hole, and the screw part of the fixing bolt is inserted into the small-diameter hole section at the left end of the stepped through hole. The left end of the screw part of the fixing bolt extends out of the stepped through hole and is screwed into the connecting screw hole on the left end face of the corresponding first mounting groove. The left end face of the spherical pad presses against the left end face of the corresponding first mounting groove, and the rotating part of the fixing bolt presses against the left end face of the large-diameter hole section at the right end of the stepped through hole.
[0011] The guide post and elastic pad are inserted into the corresponding inner mounting groove, with the outer sidewalls of the guide post and elastic pad close to the inner sidewall of the inner mounting groove, and the left end of the guide post extending out of the inner mounting groove.
[0012] The guide post is a cylindrical column;
[0013] The elastic pad includes a circular main body. The left end face of the circular main body is a spherical surface or an integral spherical surface with a circular plane in the middle. It presses against the right end face of the corresponding guide post. A central protrusion extending to the right is formed in the middle of the right end face of the circular main body. A radial extension extending outward is formed on the outer side wall of the right end of the circular main body. The right end face of the radial extension and the edge of the right end face of the circular main body are formed with the same annular protrusion. The right end face of the annular protrusion presses against the inner end face of the corresponding inner mounting groove.
[0014] The thickness of all guide posts varies depending on the vertical height of the annular mounting groove.
[0015] Multiple side-limiting stepped through holes are formed on the inner wall of the annular mounting groove. Internal threads are formed on the inner wall of the small-diameter hole section inside the side-limiting stepped through hole. The screw part of the side-limiting bolt is screwed into the small-diameter hole section of the side-limiting stepped through hole. The end of the screw part of the side-limiting bolt extends out of the inner end of the side-limiting stepped through hole and is inserted into the positioning recess formed on the outer wall of the corresponding thrust bearing. The rotating part of the side-limiting bolt is inserted into the large-diameter hole section at the outer end of the side-limiting stepped through hole.
[0016] Multiple stop pins are screwed onto the inner end face of the annular mounting groove. The left part of the stop pin is located in the annular mounting groove and is inserted into the positioning hole formed on the right end face of the corresponding thrust bearing.
[0017] All thrust bearings are evenly distributed on the left side of the support frame, with the central axis of the support frame as the center.
[0018] The outstanding effects of this invention are:
[0019] Compared with existing technologies, it can adapt to the static deflection of heavy and long shafts, and at the same time, it can adapt well to the dynamic deflection of shafts, ensuring the parallelism of the thrust bearing surface and thrust disc during equipment operation, reducing the risk of vibration, and has a long service life. Attached image description:
[0020] Figure 1 This is a partial structural schematic diagram of the present invention;
[0021] Figure 2 yes Figure 1 Partial sectional view of AA with the rotating shaft installed;
[0022] Figure 3 yes Figure 2 A magnified view of a portion of the image;
[0023] Figure 4 yes Figure 2 A magnified view of another part;
[0024] Figure 5 This is a partial structural schematic diagram of the elastic pad of the present invention;
[0025] Figure 6 yes Figure 5 A partial sectional view;
[0026] Figure 7 This is a partial structural diagram of the stop pin. Detailed implementation method:
[0027] For example, see below. Figures 1 to 7As shown, a high-thrust sliding bearing for a wind tunnel high-deflection and variable-deflection compressor includes a rotating shaft 10 and a ring-shaped support frame 30. The support frame 30 is fixed on a thrust bearing seat. The rotating shaft 10 is inserted into a transverse through hole 31 in the center of the support frame 30. A thrust disk 11 is formed on the outer wall of the middle part of the rotating shaft 10.
[0028] The left end face of the support frame 30 is formed with an annular mounting groove 32, and the right side wall of the annular mounting groove 32 is formed with multiple inner mounting grooves 33. Multiple thrust pads 20 are located on the left side of the support frame 30. The right end face of the thrust pad 20 is formed with a protrusion 21, which is inserted into the annular mounting groove 32 of the support frame 30. The side wall of the protrusion 21 is close to the inner side wall of the annular mounting groove 32. The left end face of the thrust pad 20 is in close contact with the right end face of the thrust plate 11 (when oil enters, an oil film is sandwiched between the left end face of the thrust pad 20 and the right end face of the thrust plate 11). The right end face of the protrusion 21 is formed with a first mounting groove 22, and the spherical pad 23 is installed in the first mounting groove 22, which can be inserted into the first mounting groove 22.
[0029] The specific structure is as follows: multiple laterally extending stepped through holes 232 are formed on the spherical pad 23; the rotating part of the fixing bolt 1 is inserted into the large-diameter hole section at the right end of the stepped through hole 232; the screw part of the fixing bolt 1 is inserted into the small-diameter hole section at the left end of the stepped through hole 232; the left end of the screw part of the fixing bolt 1 extends out of the stepped through hole 232 and is screwed into the connecting screw hole on the left end face of the corresponding first mounting groove 22; the left end face of the spherical pad 23 presses against the left end face of the corresponding first mounting groove 22; and the rotating part of the fixing bolt 1 presses against the left end face of the large-diameter hole section at the right end of the stepped through hole 232.
[0030] Furthermore, the right end face of the spherical pad 23 extends out of the first mounting groove 22, the guide post 34 and the elastic pad 35 are inserted into the corresponding inner mounting groove 33, the outer sidewalls of the guide post 34 and the elastic pad 35 are close to the inner sidewall of the inner mounting groove 33, the left end of the guide post 34 extends out of the inner mounting groove 33, the right end face of the elastic pad 35 presses against the inner end face of the corresponding inner mounting groove 33, the left end face of the elastic pad 35 presses against the right end face of the corresponding guide post 34, and the left end face of the guide post 34 presses against the right end face of the corresponding spherical pad 23.
[0031] All thrust pads 20 are evenly distributed on the left side of the support frame 30 with the central axis of the support frame 30 as the center; an oil inlet groove 36 is formed on the inner end face of the annular mounting groove 32 between two adjacent thrust pads 20, and an oblique oil inlet hole 37 extending to the right is formed on the bottom surface of the oil inlet groove 36, and the right end of the oblique oil inlet hole 37 extends out of the right end face or right side wall of the support frame 30.
[0032] Furthermore, an oil guide housing 38 is fixedly connected to the inner end face of the annular mounting groove 32 at the oil inlet groove 36 by bolts. A sealing gasket layer is sandwiched between the oil guide housing 38 and the inner end face of the annular mounting groove 32. Multiple oil outlet holes 381 are formed on the left end plate of the oil guide housing 38. The oil outlet holes 381 communicate with the oil guide housing 38, and the oil guide housing 38 communicates with the corresponding oil inlet groove 36.
[0033] Furthermore, the right end face of the spherical pad 23 has a rightward protruding extension 231 formed in the middle of the right end face. The right end face of the protruding extension 231 is spherical and presses against the left end face of the corresponding guide post 34.
[0034] Furthermore, the guide post 34 is a cylindrical column;
[0035] The elastic pad 35 includes a circular main body 351. The left end face of the circular main body 351 is a spherical surface or an integral spherical surface with a circular plane in the middle (the left end face of the circular main body 351 in the attached figure is a spherical surface with a circular plane in the middle). It presses against the right end face of the corresponding guide post 34. Since the left end face is a spherical surface with a circular plane in the middle, its circular plane increases the contact area with the right end face of the guide post 34, so that the entire pressure is on the circular plane, preventing the pressure from being too concentrated. In some small thrust sliding bearings, the left end face of the circular main body 351 can be an integral spherical surface.
[0036] A central protrusion 352 extending to the right is formed in the middle of the right end face of the circular main body 351. A radial extension 353 extending outward is formed on the outer side wall of the right end of the circular main body 351. The right end face of the radial extension 353 and the edge of the right end face of the circular main body 351 are formed with the same annular protrusion 354. The right end face of the annular protrusion 354 presses against the inner end face of the corresponding inner mounting groove 33. The distance between the right end face of the central protrusion 352 and the right end face of the circular main body 351 is less than the distance between the right end face of the annular protrusion 354 and the right end face of the circular main body 351.
[0037] Multiple side-limiting stepped through holes 321 are formed on the inner wall of the outer side of the annular mounting groove 32. The inner wall of the small-diameter hole section of the side-limiting stepped through hole 321 is formed with internal threads. The screw part of the side-limiting bolt 2 is screwed into the small-diameter hole section of the side-limiting stepped through hole 321. The end of the screw part of the side-limiting bolt 2 extends out of the inner end of the side-limiting stepped through hole 321 and is inserted into the positioning recess 25 formed on the outer wall of the corresponding thrust bearing 20. The rotating part of the side-limiting bolt 2 is inserted into the large-diameter hole section at the outer end of the side-limiting stepped through hole 321. The end face of the rotating part of the side-limiting bolt 2 is pressed against the end face of the large-diameter hole section at the outer end of the corresponding side-limiting stepped through hole 321.
[0038] Multiple stop pins 3 are screwed onto the inner end face of the annular mounting groove 32. The left part of the stop pin 3 is located in the annular mounting groove 32 and is inserted into the positioning hole 24 formed on the right end face of the corresponding thrust bearing 20 protrusion 21.
[0039] The thickness of all guide posts 34 varies with the vertical height of the annular mounting groove 32. That is, due to the large deflection of the rotating shaft 10, its central part deforms and bends downwards, causing the thrust plate 11 at the end of the rotating shaft 10 to have a certain inclination. Because the rotating shaft 10 is long, heavy, and rotates at a relatively low speed, in this state, the thrust plate 11 remains essentially in the same inclination state when the rotating shaft 10 rotates. Therefore, the thickness of the guide posts 34 in this embodiment needs to be matched according to the inclination value of the thrust plate 11. For example, if the distance between the upper right end face of the thrust plate 11 and the inner end face of the annular mounting groove 32 is less than the distance between the lower right end face and the inner end face of the annular mounting groove 32, then the thickness of the lower guide post 34 needs to be greater than the thickness of the upper guide post 34. Since the rotating shaft 10 is an axisymmetric component, the thicknesses of its front and rear guide posts 34 are symmetrical. Therefore, the thickness of the guide posts 34 varies with the vertical height of the annular mounting groove 32.
[0040] Guide pillars 34 of corresponding thickness are manufactured and installed in this manner, so that the surface of the thrust bearing 20 and the surface of the thrust disc 11 in this embodiment can have good parallelism, so as to eliminate the influence of static deflection when the rotating shaft 10 is stationary.
[0041] In this embodiment, the elastic pad 35 is made of spring steel. The right end face of the circular main body 351 of the elastic pad 35 has a central protrusion 352 extending to the right, and the outer side wall of the right end of the circular main body 351 has a radially extending portion 353 extending outward. The right end face of the radially extending portion 353 and the edge of the right end face of the circular main body 351 have the same annular protrusion 354. The distance between the right end face of the central protrusion 352 and the right end face of the circular main body 351 is less than the distance between the right end face of the annular protrusion 354 and the right end face of the circular main body 351. This structure allows the middle part of the elastic pad 35 to compress and elastically deform to the right when the left end face of the elastic pad 35 is subjected to force. That is, when the thrust disk 11 rotates together with the rotating shaft 10, the tilt value changes under the action of dynamic deflection, and the elastic pad 35 is also compressed or elastically restored synchronously. This dynamic adjustment keeps the surface of the thrust bearing 20 and the surface of the thrust disk 11 relatively parallel, thereby eliminating the influence of dynamic deflection when the rotating shaft 10 rotates. This makes the thrust bearing 20 and other components operate stably and have a long service life.
[0042] Oil enters through the inclined oil inlet hole 37, and oil can be sprayed out from the oil outlet hole 381 to lubricate the left end face of the thrust bearing 20, ensuring that the thrust bearing 20 generates an oil film during operation to meet the needs of rotation.
[0043] Finally, the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.
Claims
1. A high-thrust sliding bearing for a wind tunnel high-deflection, variable-deflection compressor, comprising a rotating shaft (10) and a ring-shaped support frame (30), characterized in that: The rotating shaft (10) is inserted into the transverse through hole (31) in the center of the support frame (30), and a thrust plate (11) is provided on the outer wall of the middle part of the rotating shaft (10). The left end face of the support frame (30) is formed with an annular mounting groove (32), and multiple inner mounting grooves (33) are formed on the right side wall of the annular mounting groove (32). Multiple thrust pads (20) are located on the left side of the support frame (30). A protrusion (21) is formed on the right end face of the thrust pad (20), and the protrusion (21) is inserted into the annular mounting groove (32) of the support frame (30). The left end face of the thrust pad (20) is close to the right end face of the thrust disc (11), and a first mounting groove is formed on the right end face of the protrusion (21). (22) A spherical pad (23) is installed in the first mounting groove (22). The right end face of the spherical pad (23) extends out of the first mounting groove (22). A guide post (34) and an elastic pad (35) are installed in the corresponding inner mounting groove (33). The right end face of the elastic pad (35) presses against the inner end face of the corresponding inner mounting groove (33). The left end face of the elastic pad (35) presses against the right end face of the corresponding guide post (34). The left end face of the guide post (34) presses against the right end face of the corresponding spherical pad (23). All thrust pads (20) are evenly distributed on the left side of the support frame (30) with the central axis of the support frame (30) as the center; an oil inlet groove (36) is formed on the inner end face of the annular mounting groove (32) between two adjacent thrust pads (20); an inclined oil inlet hole (37) extending to the right is formed on the bottom surface of the oil inlet groove (36); the right end of the inclined oil inlet hole (37) extends out of the right end face or right side wall of the support frame (30); An oil guide housing (38) is fixedly connected to the inner end face of the annular mounting groove (32) at the oil inlet groove (36) by bolts. A sealing gasket layer is sandwiched between the oil guide housing (38) and the inner end face of the annular mounting groove (32). Multiple oil outlet holes (381) are formed on the left end plate of the oil guide housing (38). The oil outlet holes (381) are connected to the oil guide housing (38), and the oil guide housing (38) is connected to the corresponding oil inlet groove (36). Oil enters through the inclined oil inlet hole (37), and oil can be sprayed out from the oil outlet hole (381) to lubricate the left end face of the thrust bearing (20) and ensure that the thrust bearing (20) generates an oil film when working. The thickness of all guide posts (34) varies depending on the vertical height of the annular mounting groove (32); The thickness of the guide post (34) is matched according to the inclination value of the thrust plate (11). The distance between the upper right end face of the thrust plate (11) and the inner end face of the annular mounting groove (32) is less than the distance between the lower right end face and the inner end face of the annular mounting groove (32). Therefore, the thickness of the lower guide post (34) needs to be greater than the thickness of the upper guide post (34). The rotating shaft (10) is an axisymmetric component, and the thickness of the guide post (34) at the front and rear is symmetrical. The thickness of the guide post (34) is matched according to the different vertical height of the annular mounting groove (32). Guide columns (34) of corresponding thickness are manufactured in sequence and installed in this manner. The surface of the thrust bearing (20) and the surface of the thrust plate (11) can have good parallelism to eliminate the influence of static deflection when the shaft (10) is stationary.
2. The high-thrust sliding bearing for a wind tunnel high-deflection, variable-deflection compressor according to claim 1, characterized in that: The right end face of the spherical pad (23) is formed with a protruding extension (231) extending to the right. The right end face of the protruding extension (231) is spherical and presses against the left end face of the corresponding guide post (34).
3. The high-thrust sliding bearing for a wind tunnel high-deflection, variable-deflection compressor according to claim 1, characterized in that: The spherical pad (23) has multiple laterally extending stepped through holes (232). The rotating part of the fixing bolt (1) is inserted into the large-diameter hole section at the right end of the stepped through hole (232). The screw part of the fixing bolt (1) is inserted into the small-diameter hole section at the left end of the stepped through hole (232). The left end of the screw part of the fixing bolt (1) extends out of the stepped through hole (232) and is screwed into the connecting screw hole on the left end face of the corresponding first mounting groove (22). The left end face of the spherical pad (23) presses against the left end face of the corresponding first mounting groove (22). The rotating part of the fixing bolt (1) presses against the left end face of the large-diameter hole section at the right end of the stepped through hole (232).
4. The high-thrust sliding bearing for a wind tunnel high-deflection, variable-deflection compressor according to claim 1, characterized in that: The guide post (34) is a cylindrical column; The elastic pad (35) includes a circular main body (351). The left end face of the circular main body (351) is a spherical surface or an integral spherical surface with a circular plane in the middle. It presses against the right end face of the corresponding guide post (34). A central protrusion (352) extending to the right is formed in the middle of the right end face of the circular main body (351). A radial extension (353) extending outward is formed on the outer side wall of the right end of the circular main body (351). The right end face of the radial extension (353) and the edge of the right end face of the circular main body (351) are formed with the same annular protrusion (354). The right end face of the annular protrusion (354) presses against the inner end face of the corresponding inner mounting groove (33).
5. The high-thrust sliding bearing for a wind tunnel high-deflection, variable-deflection compressor according to claim 1, characterized in that: The inner wall of the annular mounting groove (32) is formed with a plurality of side limiting stepped through holes (321). The inner wall of the small diameter hole section of the side limiting stepped through hole (321) is formed with an internal thread. The screw part of the side limiting bolt (2) is screwed into the small diameter hole section of the side limiting stepped through hole (321). The end of the screw part of the side limiting bolt (2) extends out of the inner end of the side limiting stepped through hole (321) and is inserted into the positioning recess (25) formed on the outer wall of the corresponding thrust bearing (20). The rotating part of the side limiting bolt (2) is inserted into the large diameter hole section at the outer end of the side limiting stepped through hole (321).