An integrated fan main shaft system with a double-arrangement replaceable self-aligning sliding bearing

Abstract

The present invention discloses an integrated fan main shaft system with a double-arrangement replaceable self-aligning sliding bearing, which includes: a fan main shaft, a bearing housing, a plurality of sliding bearing blocks and oil sacs. There is a bearing block placement groove arranged circumferentially along the journal on each side of the isolation ring; a plurality of main shaft oil grooves are provided on the isolation ring, and a plurality of oil groove oil outlet holes are provided on both sides of the main shaft oil grooves; a plurality of sliding bearing blocks are evenly distributed in the bearing block placement grooves; a plurality of oil sacs are arranged at intervals with the sliding bearing blocks, and a through oil scraping oil inlet hole is provided at the lower part of the oil scraper, and an oil scraping oil outlet hole is communicated with the middle of the oil scraping oil inlet hole; the bearing housing is installed outside the sliding bearing blocks. By integrally profiling the sliding bearing and related fitting parts into a double-arrangement self-aligning roller bearing, the present invention realizes that a single type of sliding bearing bears various loads received by the fan main shaft. At the same time, through the self-aligning design, the adaptability of the bearing to the installation error and the deformation generated during operation is improved, and the economy and reliability of the fan main shaft are improved.

Description

Technical Field

[0001] The invention belongs to the field of wind turbine main shafts, and in particular relates to a wind turbine main shaft system with double-arranged replaceable self-aligning sliding bearings. Background Art

[0002] In recent years, with the continuous growth of global demand for renewable energy, the wind power industry has ushered in unprecedented development opportunities. The design and manufacturing technology of wind turbine products has been rapidly iterating, especially reflected in the trend of larger wind turbines. This trend aims to improve power generation efficiency by increasing the capacity of individual units, thereby reducing the cost per kilowatt-hour. However, this also places more stringent requirements on key wind turbine components, especially the main shaft bearings. As wind turbines become larger, the rolling bearings used in the wind turbine main shaft position are becoming larger, heavier, and more expensive. As a result, the weight and cost of the main bearings in large wind turbines are gradually increasing. This is contrary to the goal of reducing the cost per kilowatt by increasing the size of wind turbines.

[0003] Traditionally, wind turbine main shafts have been supported by rolling bearings. However, as wind turbines continue to grow in size, the size, weight, and cost of these bearings have also increased dramatically, becoming a significant factor impacting wind turbine economics. Large rolling bearings not only present numerous challenges during production, transportation, and installation, but their high maintenance costs and complex replacement procedures have become a key bottleneck restricting the long-term operational efficiency of wind turbines.

[0004] To meet this challenge, the industry has begun exploring the technical approach of "sliding instead of rolling," which involves using sliding bearings to replace traditional rolling bearings on the wind turbine main shaft. Compared to rolling bearings, sliding bearings offer advantages such as strong load-bearing capacity, smooth operation, and low noise, especially under large and heavy load conditions. However, the use of sliding bearings also brings new problems: First, sliding bearings are highly dependent on the lubrication system, requiring a more complex and reliable lubrication system, which adds additional costs; second, the stress conditions on the wind turbine main shaft are extremely complex. Not only do they have to withstand huge radial loads, but they also have to cope with multi-directional composite forces such as axial loads and overturning moments under abnormal wind loads. This places extremely high demands on the material selection, structural design, and manufacturing process of sliding bearings. Any carelessness can lead to premature failure of the bearings, increasing the failure rate and difficulty in operation and maintenance. Summary of the Invention

[0005] The object of the present invention is to overcome the deficiencies in the prior art and provide an integrated fan main shaft system with double-arrangement replaceable self-aligning sliding bearings. Through the double-arrangement self-aligning design, a single type of sliding bearing is used to bear various loads on the fan main shaft, eliminating the need to additionally configure other types of sliding bearings. This not only simplifies the shaft system structure and reduces costs but also improves the bearing's adaptability to installation errors and deformations occurring during operation through the self-aligning design, enhancing the economy and reliability of the fan main shaft.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] An integrated fan main shaft system with double-arrangement replaceable self-aligning sliding bearings, comprising:

[0008] A fan main shaft, on which a journal is provided. An isolation ring is provided in the middle of the journal, and on both sides of the isolation ring, there is a bearing block placement groove arranged circumferentially along the journal. A number of main shaft oil grooves are provided on the isolation ring, and a number of oil groove oil outlet holes are provided on both sides of the main shaft oil grooves.

[0009] A number of sliding bearing blocks are evenly distributed in the bearing block placement grooves, and the outer end face of the sliding bearing block is profiled to the arc surface of the rollers in the rolling bearing.

[0010] A number of oil sacs are arranged at intervals with the sliding bearing blocks. An oil scraping card slot is provided inside the oil sac, and an oil scraper is installed in the oil scraping card slot. The oil scraper divides the oil sac into two oil sac cavities. An oil sac cover plate is provided on the upper part of the oil sac cavity. An oil sac oil inlet hole is provided on one side of each oil sac cavity, and the oil sac oil inlet hole corresponds to the position of the oil groove oil outlet hole on one side of the main shaft oil groove. A through oil scraper oil inlet hole is provided at the lower part of the oil scraper. The middle part of the oil scraper oil inlet hole is connected with an oil scraper oil outlet hole. The upper end of the oil scraper oil outlet hole is located on the outer end face of the oil scraper, and the outer end face of the oil scraper is adapted to the outer end face of the sliding bearing block.

[0011] A bearing housing is installed outside the sliding bearing blocks. The inner wall of the bearing housing is adapted to the sliding bearing blocks and the oil scrapers. An oil film is formed between the inner wall of the bearing housing and the outer arc surfaces of the sliding bearing blocks and the oil scrapers. An oil injection hole is provided on the bearing housing, and the oil injection hole is opened in the non-load-bearing area of the bearing housing and corresponds to the position of the main shaft oil groove. Seals are provided on both sides of the bearing housing for sealing the sliding bearings.

[0012] Further, the sliding bearing blocks are symmetrically arranged in the bearing block placement grooves on both sides, or the sliding bearing blocks are staggeredly arranged in the bearing block placement grooves on both sides.

[0013] Further, a number of communication holes are provided at the lower part of the oil scraper, and the communication holes connect the two oil sac cavities on both sides to make the lubricating oil in the two oil sac cavities evenly distributed.

[0014] Furthermore, the journal, the steel back of the sliding bearing block, and the oil pocket are made of alloy steel with the same properties, and the working surface material of the sliding bearing is made of steel back, alloy layer, and coating.

[0015] Furthermore, a bearing pad groove is provided on one side of the bearing block placement groove. The bearing pad groove penetrates through the journal on one side. A number of first half-threaded holes are provided at the lower part of the bearing pad groove; a bearing pad is installed inside the bearing pad groove. The upper surface of the bearing pad is flush with the bearing block placement groove. The bearing pad and the bearing block placement groove jointly support the sliding bearing block; a second half-threaded hole corresponding to the first half-threaded hole is provided at the lower part of the bearing pad. The first half-threaded hole and the second half-threaded hole form a complete threaded hole. A screw is threadedly connected inside the first half-threaded hole and the second half-threaded hole for fixing the bearing pad and the journal; Oil pocket installation grooves are arranged at intervals on the bearing block placement groove, and the oil pockets are installed in the oil pocket installation grooves.

[0016] Furthermore, a number of first threaded holes are provided on one side of the sliding bearing block, and the first threaded holes are arranged axially on the sliding bearing block for connecting with a disassembly tool.

[0017] Furthermore, a number of inspection openings are provided on the bearing housing, and the positions of the inspection openings correspond to those of the sliding bearing block. The inspection openings are opened in the non-force-bearing area of the bearing housing, and inspection window covers are installed on the inspection openings.

[0018] Furthermore, a number of second threaded holes are provided on one side of the sliding bearing block, and the second threaded holes are arranged circumferentially on the sliding bearing block for connecting with a disassembly tool.

[0019] Furthermore, a number of first positioning holes are provided on the bearing block placement groove, and a second positioning hole is provided at the lower part of the sliding bearing block. The positions of the first positioning hole and the second positioning hole correspond to each other. A positioning pin is provided inside the first positioning hole. One end of the positioning pin is in interference fit with the first positioning hole, and the other end of the positioning pin is in transition fit with the second positioning hole.

[0020] Furthermore, an oil pocket pressing groove is provided at the lower part of the sliding bearing block. Oil pocket wing plates are provided on both sides of the oil pocket. The oil pocket wing plates are press-fitted into the oil pocket pressing groove of the sliding bearing block. A pin hole groove for avoiding the positioning pin is provided on one side of the oil pocket wing plate.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1) By integrally profiling the sliding bearing and related mating parts into a double-row self-aligning roller bearing, the present invention realizes that a single type of sliding bearing bears various loads received by the fan main shaft. At the same time, through the self-aligning design, the adaptability of the bearing to installation errors and deformations generated during operation is improved, and the economy and reliability of the fan main shaft are improved.

[0023] 2) The journal, the steel back of the sliding bearing block, and the oil pocket are made of alloy steel with the same properties. The working surface material of the sliding bearing is made of steel back, alloy layer, and coating. The alloy layer meets the requirements of shock resistance and wear resistance, and the coating meets the working conditions such as initial running-in, frequent start and stop under low-speed and heavy-load conditions, or even restart after long-term shutdown.

[0024] 3) A maintenance and replacement solution for the sliding bearing block is provided. That is, when the sliding bearing block is abnormally worn, the seal is removed, the sliding bearing block to be replaced is rotated to the non-force-bearing area, then the bearing pad is disassembled, and the sliding bearing block is axially removed for maintenance or replacement.

[0025] 4) Another maintenance and replacement solution for the sliding bearing block is provided. That is, when the sliding bearing block is abnormally worn, the inspection window cover plate is opened, the sliding bearing block to be replaced is rotated to the inspection opening, and the sliding bearing block is radially removed for maintenance or replacement. There is no need to disassemble the seal or arrange the bearing pad, realizing the maintenance or replacement of sliding bearing blocks at different positions at the same fixed position, enabling quick replacement in the engine room, reducing the maintenance cycle and replacement cost.

[0026] 5) Threaded holes are provided axially or axially on the sliding bearing block for installing disassembly tools when disassembling the sliding bearing block, facilitating the application of force during disassembly.

[0027] 6) By providing a first positioning hole on the bearing block placement groove and a second positioning hole at the lower part of the sliding bearing block, the position of the sliding bearing block is quickly positioned using a positioning pin, improving the efficiency during installation or maintenance of the sliding bearing block and the accuracy of the installation position of the sliding bearing block.

[0028] 7) An oil pocket pressing groove is provided at the lower part of the sliding bearing block, oil pocket wing plates are provided on both sides of the oil pocket, and a pin hole groove for avoiding the positioning pin is provided on one side of the oil pocket wing plate. The oil pocket wing plate is press-fitted into the oil pocket pressing groove of the sliding bearing block, ensuring the stability of the oil pocket installation. Brief Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of the bearing seat in Embodiment 1.

[0030] Figure 2 is a cross-sectional view of the fan main shaft shafting in Embodiment 1.

[0031] Figure 3 is a schematic structural diagram of the fan main shaft in Embodiment 1.

[0032] Figure 4 is Figure 3 the enlarged view at A in

[0033] Figure 5It is a schematic assembly diagram of the fan main shaft, sliding bearing block, bearing pad and oil bladder in Embodiment 1.

[0034] Figure 6 It is a schematic structural diagram of the sliding bearing block in Embodiment 1.

[0035] Figure 7 It is a schematic structural diagram of the bearing pad.

[0036] Figure 8 It is a bottom view of the bearing pad.

[0037] Figure 9 It is an explosion diagram of the oil bladder and oil scraper in Embodiment 1.

[0038] Figure 10 It is a schematic structural diagram of the bearing housing in Embodiment 2.

[0039] Figure 11 It is a sectional view of the fan main shaft shafting in Embodiment 2.

[0040] Figure 12 It is a schematic structural diagram of the fan main shaft in Embodiment 2.

[0041] Figure 13 It is Figure 12 The enlarged view at position B in

[0042] Figure 14 It is a schematic structural diagram of the sliding bearing block in Embodiment 2.

[0043] Figure 15 It is a bottom view of the sliding bearing block in Embodiment 2.

[0044] Figure 16 It is a schematic assembly diagram of the oil bladder and oil scraper in Embodiment 2.

[0045] In the figure, 1. Fan main shaft; 11. Journal; 12. Bearing block placement groove; 13. Isolation ring; 14. Main shaft oil groove; 15. Oil groove oil outlet hole; 16. First half-threaded hole; 17. Bearing pad groove; 18. First positioning hole; 19. Oil bladder installation groove; 2. Sliding bearing block; 21. First threaded hole; 22. Second positioning hole; 23. Positioning pin; 24. Oil bladder pressing groove; 25. Second threaded hole; 3. Bearing pad; 31. Second half-threaded hole; 4. Oil bladder; 41. Oil bladder cavity; 42. Oil scraper card slot; 43. Oil bladder oil inlet hole; 44. Oil bladder cover plate; 45. Oil bladder wing plate; 46. Pin hole groove; 5. Oil scraper; 51. Communication hole; 52. Oil scraper oil inlet hole; 53. Oil scraper oil outlet hole; 6. Bearing housing; 61. Oil injection hole; 62. Maintenance window cover plate; 63. Maintenance port; 7. Sealing element. Detailed implementation manners

[0046] Next, it will be combined with the attached Figures 1-16, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0048] Embodiment 1

[0049] As Figures 1-3 shown, a double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft system includes a fan main shaft 1, a bearing seat 6, a plurality of sliding bearing blocks 2 and oil sacs 4. A journal 11 is provided on the fan main shaft 1. As Figure 4 shown, a separating ring 13 is provided in the middle of the journal 11, and a bearing block placement groove 12 arranged circumferentially along the journal 11 is provided on each side of the separating ring 13; a plurality of main shaft oil grooves 14 are provided on the separating ring 13, and a plurality of oil groove oil outlet holes 15 are provided on both sides of the main shaft oil grooves 14; a plurality of sliding bearing blocks 2 are evenly distributed in the bearing block placement groove 12, and the outer end face of the sliding bearing block 2 is profiled to the arc surface of the roller of the rolling bearing;

[0050] As Figure 5 shown, a plurality of oil sacs 4 are arranged at intervals with the sliding bearing blocks 2. As Figure 9 shown, an oil scraping card slot 42 is provided inside the oil sac 4, and an oil scraper 5 is installed in the oil scraping card slot 42. The oil scraper 5 divides the oil sac 4 into two oil sac cavities 41. An oil sac cover plate 44 is provided on the upper part of the oil sac cavity 41. An oil sac oil inlet hole 43 is provided on one side of each oil sac cavity 41, and the oil sac oil inlet hole 43 corresponds to the position of the oil groove oil outlet hole 15 on one side of the main shaft oil groove 14. A through oil scraper oil inlet hole 52 is provided at the lower part of the oil scraper 5, and an oil scraper oil outlet hole 53 is communicated with the middle of the oil scraper oil inlet hole 52. The upper end of the oil scraper oil outlet hole 53 is located on the outer end face of the oil scraper 5, and the outer end face of the oil scraper 5 is adapted to the outer end face of the sliding bearing block 2;

[0051] As Figure 1 , Figure 2As shown, the bearing housing 6 is installed outside the sliding bearing block 2. The inner wall of the bearing housing 6 is adapted to the sliding bearing block 2 and the oil scraper 5, and an oil film is formed between the inner wall of the bearing housing 6 and the outer arc surfaces of the sliding bearing block 2 and the oil scraper 5. An oil injection hole 61 is provided on the bearing housing 6. The oil injection hole 61 is opened in the non-load-bearing area of the bearing housing 6, and the position of the oil injection hole 61 corresponds to the main shaft oil groove 14. Seals 7 are provided on both sides of the bearing housing 6 for sealing the sliding bearing.

[0052] In the present invention, the "outer ring of the rolling bearing" and the bearing housing 6 are designed and integrated into one body. The bearing block placement groove 12 is profiled into the "inner ring of the rolling bearing" and integrated with the fan main shaft 1. The sliding bearing block 2 is profiled into the "rolling element of the rolling bearing". Compared with the spherical rollers in the rolling bearing, in this solution, the sliding bearing block 2 with a spherical structure is fixed in the bearing block placement groove of the fan main shaft 1 and rotates together with the fan main shaft 1. The oil pocket 4 is profiled into the "cage of the rolling bearing". By profiling a double-row self-aligning roller bearing, it is realized that the sliding bearing, like the rolling bearing, can bear various loads applied to the fan main shaft.

[0053] The working surface of the sliding bearing block of the sliding bearing is profiled into the surface of a barrel-shaped roller. The center of the circular arc of the inner wall surface of the bearing housing 6 that cooperates with the sliding bearing block 2 is at the center position of the bearing. Therefore, the sliding bearing as a whole has the performance advantages of a double-row self-aligning roller bearing, that is, it mainly bears radial forces and also bears axial forces generated by the wind. At the same time, due to changes in the wind and wind turbulence, it can still rotate normally when an overturning moment is generated due to the bending and tilting of the main shaft, and has good self-aligning performance.

[0054] In terms of the lubrication system, by injecting high-pressure lubricating oil into the oil injection hole 61, the lubricating oil flows into the main shaft oil groove 14, and then enters the oil pocket cavity 41 through the oil groove oil outlet hole 15 and the oil pocket oil inlet hole 43 in sequence. Then, it flows from the oil pocket cavity 41 into the oil scraper oil inlet hole 52. When the oil scraper 5 rotates to the area below the horizontal of the fan main shaft 1, that is, the load-bearing area, the lubricating oil flows out from the oil scraper oil outlet hole 53. When the oil scraper 5 rotates with the fan main shaft 1, the flowing lubricating oil is evenly distributed on the working surface between the sliding bearing block 2 and the bearing housing 6, and a complete oil film is formed, realizing the lubrication between the sliding bearing block and the bearing housing without a complex lubrication system.

[0055] As a further preference of this embodiment, the sliding bearing blocks 2 are symmetrically arranged in the bearing block placement grooves 12 on both sides, or the sliding bearing blocks 2 are staggeredly arranged in the bearing block placement grooves 12 on both sides.

[0056] As Figure 9 As shown, a plurality of communication holes 51 are provided at the lower part of the oil scraper 5. The communication holes 51 communicate the oil pocket cavities 41 on both sides, so that the lubricating oil in the two oil pocket cavities 41 is evenly distributed.

[0057] As a further preference of this embodiment, the journal 11, the steel back of the sliding bearing block, and the oil bag 4 are made of alloy steel with the same properties. The working surface of the sliding bearing (the outer arc surface of the sliding bearing block 2 and the inner wall of the bearing seat 6) is made of a steel back, an alloy layer, and a coating. Among them, the alloy layer meets the requirements of impact resistance and wear resistance, and the coating meets the working conditions such as initial running-in, frequent start and stop under low-speed and heavy-load conditions, or even starting again after long-term shutdown.

[0058] As Figure 4 shown, a bearing pad groove 17 is provided on one side of the bearing block placement groove 12. The bearing pad groove 17 penetrates through the journal 11 on one side. A number of first half-threaded holes 16 are provided below the bearing pad groove 17; a bearing pad 3 is installed inside the bearing pad groove 17. The upper surface of the bearing pad 3 is flush with the bearing block placement groove 12. The bearing pad 3 and the bearing block placement groove 12 jointly support the sliding bearing block 2; As Figure 7 、 Figure 8 shown, a second half-threaded hole 31 corresponding to the first half-threaded hole 16 is provided below the bearing pad 3. The first half-threaded hole 16 and the second half-threaded hole 31 form a complete threaded hole. Screws are threadedly connected in the first half-threaded hole 16 and the second half-threaded hole 31 for fixing the bearing pad 3 to the journal 11; As Figure 4 shown, oil bag installation grooves 19 are arranged at intervals on the bearing block placement groove 12. The oil bags 4 are installed in the oil bag installation grooves 19.

[0059] In this embodiment, when the sliding bearing block 2 is abnormally worn, the seal 7 is removed, the sliding bearing block 2 to be replaced is rotated to the non-force-bearing area, then the bearing pad 3 is disassembled, and the sliding bearing block 2 is removed axially for maintenance or replacement.

[0060] As Figure 6 shown, a number of first threaded holes 21 are provided on one side of the sliding bearing block 2, and the first threaded holes 21 are arranged axially on the sliding bearing block 2 for connection with a disassembly tool to facilitate pulling out the sliding bearing block 2 axially from the bearing block placement groove 12.

[0061] Embodiment 2

[0062] Different from Embodiment 1, as Figure 10As shown, several inspection openings 63 are provided on the bearing housing 6. The inspection openings 63 correspond to the positions of the sliding bearing blocks 2. The inspection openings 63 are opened in the non-force-bearing area of the bearing housing 6, and inspection window covers 62 are installed on the inspection openings 63. In this embodiment, when the sliding bearing block 2 is abnormally worn, the inspection window cover 62 is opened, and the sliding bearing block 2 to be replaced is rotated to the inspection opening 63, and the sliding bearing block 2 is radially removed for maintenance or replacement. In this embodiment, there is no need to disassemble the seal 7, and there is no need to arrange bearing pads, realizing the maintenance or replacement of the sliding bearing blocks 2 at different positions at the same fixed position, and quick replacement can be carried out in the engine room, reducing the maintenance cycle and replacement cost.

[0063] As Figure 14 、 Figure 15 shown, several second threaded holes 25 are provided on one side of the sliding bearing block 2, and the second threaded holes 25 are arranged in the circumferential position of the sliding bearing block 2 for connecting with a disassembly tool to radially remove the sliding bearing block 2.

[0064] As Figure 13 shown, several first positioning holes 18 are provided on the bearing block placement groove 12. As Figure 15 shown, positioning holes two 22 are provided at the lower part of the sliding bearing block 2. The positions of the first positioning holes 18 and the positioning holes two 22 correspond to each other. As Figure 11 shown, positioning pins 23 are provided in the first positioning holes 18. One end of the positioning pin 23 is in interference fit with the first positioning hole 18, and the other end of the positioning pin 23 is in transitional fit with the positioning hole two 22, facilitating the quick positioning and installation of the sliding bearing block 2.

[0065] As Figure 14 、 Figure 15 shown, an oil bladder pressing groove 24 is provided at the lower part of the sliding bearing block 2. As Figure 16 shown, oil bladder wing plates 45 are provided on both sides of the oil bladder 4. The oil bladder wing plates 45 are pressed into the oil bladder pressing groove 24 of the sliding bearing block 2. A pin hole groove 46 for avoiding the positioning pin 23 is provided on one side of the oil bladder wing plate 45, ensuring the stability of the installation of the oil bladder 4.

[0066] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of the present technology make various modifications or supplements or use similar methods to replace the specific embodiments described, as long as they do not deviate from the scope defined by the structure of the invention, they should fall within the protection scope of the present invention.

Claims

1. A double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft system, characterized in that, Comprising: A main shaft of a fan, on which a journal is provided. In the middle of the journal, an isolation ring is provided, and on both sides of the isolation ring, there is a bearing block placement groove arranged circumferentially along the journal; on the isolation ring, there are a number of main shaft oil grooves, and on both sides of the main shaft oil grooves, there are a number of oil groove oil outlet holes; A number of sliding bearing blocks, evenly distributed in the bearing block placement grooves, and the outer end surface of the sliding bearing block is profiled to the arc surface of the rollers in the rolling bearing; A number of oil sacs, arranged at intervals with the sliding bearing blocks. Inside the oil sacs, there are oil scraping card slots, and an oil scraper is installed in the oil scraping card slots. The oil scraper divides the oil sac into two oil sac cavities. An oil sac cover plate is provided on the upper part of the oil sac cavity. On one side of each oil sac cavity, there is an oil sac oil inlet hole, and the oil sac oil inlet hole corresponds to the position of the oil groove oil outlet hole on one side of the main shaft oil groove. A through oil scraping oil inlet hole is provided at the lower part of the oil scraper. The middle part of the oil scraping oil inlet hole is connected with an oil scraping oil outlet hole. The upper end of the oil scraping oil outlet hole is located on the outer end surface of the oil scraper, and the outer end surface of the oil scraper is adapted to the outer end surface of the sliding bearing block; A bearing housing, installed outside the sliding bearing block. The inner wall of the bearing housing is adapted to the sliding bearing block and the oil scraper. An oil film is formed between the inner wall of the bearing housing and the outer arc surfaces of the sliding bearing block and the oil scraper; on the bearing housing, there is an oil injection hole, which is opened in the non-bearing area of the bearing housing and corresponds to the position of the main shaft oil groove. Seals are provided on both sides of the bearing housing for the sealing of the sliding bearing.

2. The integrated fan main shaft system of a double-arrangement replaceable self-aligning sliding bearing according to claim 1, characterized in that The sliding bearing blocks are symmetrically arranged in the bearing block placement grooves on both sides, or the sliding bearing blocks are staggeredly arranged in the bearing block placement grooves on both sides.

3. The integrated fan main shaft system with a double-arrangement replaceable self-aligning sliding bearing according to claim 1, wherein A number of communication holes are provided at the lower part of the oil scraper, and the communication holes communicate the oil sac cavities on both sides to make the lubricating oil in the two oil sac cavities evenly distributed.

4. A double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft system according to claim 1, characterized in that, The journal, the steel back of the sliding bearing block, and the oil sac are made of alloy steel with the same properties. The working surface material of the sliding bearing is made of steel back, alloy layer, and coating.

5. A double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft system according to any one of claims 1-4, characterized in that, On one side of the bearing block placement groove, there is a bearing pad groove, and one side of the bearing pad groove penetrates the journal. A number of semi-threaded holes one are provided at the lower part of the bearing pad groove; a bearing pad is installed inside the bearing pad groove, and the upper surface of the bearing pad is flush with the bearing block placement groove. The bearing pad and the bearing block placement groove jointly support the sliding bearing block; a number of semi-threaded holes two corresponding to the semi-threaded holes one are provided at the lower part of the bearing pad. The semi-threaded holes one and the semi-threaded holes two form a complete threaded hole, and screws are threadedly connected in the semi-threaded holes one and the semi-threaded holes two for the fixation of the bearing pad and the journal; oil sac installation grooves are arranged at intervals on the bearing block placement groove, and the oil sacs are installed in the oil sac installation grooves.

6. The integrated fan main shaft system of a double-arrangement replaceable self-aligning sliding bearing according to claim 5, characterized in that, A number of first threaded holes are provided on one side of the sliding bearing block, and the first threaded holes are arranged axially on the sliding bearing block for connection with a disassembly tool.

7. A double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft system according to any one of claims 1-4, characterized in that, A number of inspection openings are provided on the bearing housing, and the inspection openings correspond to the positions of the sliding bearing blocks. The inspection openings are opened in the non-force-bearing area of the bearing housing, and inspection window cover plates are installed on the inspection openings.

8. A double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft system according to claim 7, characterized in that, A number of second threaded holes are provided on one side of the sliding bearing block, and the second threaded holes are arranged circumferentially on the sliding bearing block for connection with a disassembly tool.

9. A double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft system according to claim 7, characterized in that, A number of first positioning holes are provided on the bearing block placement groove. A second positioning hole is provided at the lower part of the sliding bearing block. The positions of the first positioning hole and the second positioning hole correspond to each other. A positioning pin is provided in the first positioning hole, and one end of the positioning pin is in interference fit with the first positioning hole, and the other end of the positioning pin is in transitional fit with the second positioning hole.

10. A double-arrangement replaceable self-aligning sliding bearing integrated fan main shaft system according to claim 7, characterized in that, An oil bladder pressing groove is provided at the lower part of the sliding bearing block. Oil bladder wing plates are provided on both sides of the oil bladder. The oil bladder wing plates are press-fitted in the oil bladder pressing groove of the sliding bearing block. A pin hole groove for avoiding the positioning pin is provided on one side of the oil bladder wing plate.

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