WO2024114736A1 - Shaft system and wind generating set - Google Patents

Abstract

A shaft system and a wind generating set. The shaft system comprises a rotating shaft (1), a first bearing seat (2) and a second bearing seat (3), wherein the first bearing seat (2) is arranged at a first end of the rotating shaft (1); the second bearing seat (3) is arranged on the rotating shaft (1) and is spaced apart from the first bearing seat (2), the rotating shaft (1) is rotatably arranged on the first bearing seat (2) and the second bearing seat (3), and a pair of thrust bearings (4) are respectively arranged on two axial sides of the first bearing seat (2). The wind generating set comprises the shaft system. The first bearing seat (2) and the second bearing seat (3) are respectively arranged independently to form split bearing seats, and a single bearing seat has a small size and light weight, so that the shaft system has low costs, and the maintenance of each bearing is simple and convenient.

Description

Shaft system and wind turbine Technical Field

The present invention belongs to the technical field of wind power generation, and in particular relates to a shaft system and a wind power generator set.

Background technique

At present, the capacity of wind turbines is getting larger and larger, and the size of wind turbines is also getting larger and larger. As the design size of wind turbines increases, the shaft system cost of rolling bearing design solutions is getting higher and higher due to the difficulty of rolling bearing manufacturing process, high material requirements, and high processing difficulty.

Summary of the invention

The main purpose of the present disclosure is to provide a shaft system and a wind turbine generator set to reduce the manufacturing cost of the wind turbine generator set.

In view of the above objectives, the present disclosure provides the following technical solutions:

The present invention provides a shaft system, which includes a rotating shaft, a first bearing seat and a second bearing seat, wherein the first bearing seat is arranged at the first end of the rotating shaft; the second bearing seat is arranged on the rotating shaft and spaced apart from the first bearing seat, wherein the rotating shaft is rotatably arranged on the first bearing seat and the second bearing seat, and a pair of thrust bearings are respectively arranged on both axial sides of the first bearing seat.

The shaft system provided by the present invention includes a first bearing seat and a second bearing seat, and the first bearing seat and the second bearing seat are independently arranged respectively, forming a split bearing seat. A single bearing seat is small in size and light in weight, thereby reducing the cost of the shaft system and simplifying the maintenance of each bearing.

In another aspect of the present disclosure, a wind turbine generator set is provided, wherein the wind turbine generator set comprises the shaft system as described above.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or other objects and advantages of the present disclosure will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

FIG. 1 is a structural diagram of a shaft system provided by an exemplary embodiment of the present disclosure.

FIG. 2 is an enlarged view of the thrust bearing in FIG. 1 .

FIG. 3 is a structural diagram of the second bearing seat and the bearing unit in FIG. 1 .

FIG. 4 is a structural diagram of the bearing unit in FIG. 3 .

FIG. 5 is a partial structural diagram of the first end flange in FIG. 1 .

FIG. 6 is a partial structural diagram of the second end flange in FIG. 1 .

Description of reference numerals:

1. Rotating shaft; 2. First bearing seat;

3. Second bearing seat; 4. Thrust bearing;

5. End flange; 6. Step;

7. Bearing unit;

41. First support seat; 42. Limiting ring;

43. The first elastic pad; 44. The first tile steel back;

45. Sealing ring; 46. Arc oil groove;

47. Tile receiving groove; 48. Wear-resistant layer;

49. Fastener mounting holes;

51. First end flange; 52. Second end flange.

71. The second support seat; 72. The second tile steel back;

73. Pin shaft; 74. Second elastic pad;

26. External pipeline; 221. Oil inlet channel.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be understood that the implementation of the present disclosure is limited to the embodiments set forth herein. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

The present disclosure provides a wind turbine generator set, which includes a tower, a nacelle arranged on the top of the tower, an impeller and a generator arranged on the nacelle, wherein the impeller and the generator are connected through a main shaft so that the impeller rotates to drive the generator to generate electricity.

The present disclosure provides a shaft system that can adapt to a large-sized wind turbine generator set, and in particular, can adapt to a main shaft with a large diameter.

1, specifically, the shaft system includes a rotating shaft 1, a first bearing seat 2 and a second bearing seat 3, the first bearing seat 2 is arranged at a first end of the rotating shaft 1, and the second bearing seat 3 is arranged on the rotating shaft 1 and is connected to the first end of the rotating shaft 1. A bearing seat 2 is arranged at intervals, wherein the rotating shaft 1 is rotatably arranged on the first bearing seat 2 and the second bearing seat 3, and a pair of thrust bearings 4 are respectively arranged on both sides of the axial direction of the first bearing seat 2.

The shaft system provided by the present invention includes a first bearing seat 2 and a second bearing seat 3, and the first bearing seat 2 and the second bearing seat 3 are independently arranged respectively, forming a split bearing seat. A single bearing seat is small in size and light in weight, thereby reducing the cost of the shaft system and simplifying the maintenance of each bearing.

As an example, in the shaft system provided in this embodiment, the rotating shaft 1 is the main shaft of the wind turbine generator set, and the main shaft is connected between the impeller and the generator so as to transmit the rotation of the impeller to the generator for power generation, but it is not limited thereto.

Continuing to refer to Figure 1, a pair of end flanges 5 are provided at the first end of the rotating shaft 1. The pair of end flanges 5 are spaced apart on both axial sides of the first bearing seat 2, and a pair of thrust bearings 4 are respectively provided between the end flanges 5 and the first bearing seat 2 to support the end flanges 5 to rotate relative to the first bearing seat 2.

As an example, the first bearing seat 2 can be fixed on the nacelle, for example but not limited to, the first bearing seat 2 is fixed on a support platform in the nacelle, but not limited thereto. The thrust bearing 4 is arranged on both axial sides of the first bearing seat 2 to support the end flange 5 to rotate relative to the first bearing seat 2.

The thrust bearing 4 can be fixed on the end flange 5 and can be in relative sliding contact with the first bearing seat 2. Specifically, the first end of the thrust bearing 4 is connected to the end flange 5, and the second end of the thrust bearing 4 faces the first bearing seat 2 and is in sliding contact with the first bearing seat 2, but the present invention is not limited thereto.

Optionally, the thrust bearing 4 can be fixed on the first bearing seat 2 and can be in relative sliding contact with the end flange 5. Specifically, the first end of the thrust bearing 4 is connected to the first bearing seat 2, and the second end of the thrust bearing 4 faces the end flange 5 and is in sliding contact with the end flange 5.

Furthermore, a pair of thrust bearings 4 can be symmetrically arranged on both axial sides of the first bearing seat 2 to be able to adapt to thrusts in two axial directions of the first bearing seat 2, thereby improving the adaptability of the shaft system.

The radial inner side of the first bearing seat 2 provided in this embodiment is further provided with a bearing unit 7 to support the radial force of the rotating shaft 1. Specifically, a bearing unit 7 is further provided between the first bearing seat 2 and the rotating shaft 1, and the bearing unit 7 is provided between a pair of thrust bearings 4 along the axial direction of the rotating shaft 1, and the bearing unit 7 is provided on the radial inner side of the first bearing seat 2, that is, the bearing unit 7 is provided on the radial outer side of the rotating shaft 1, and is provided on the radial inner side of the first bearing seat 2, so that the bearing unit 7 is supported between the first bearing seat 2 and the rotating shaft 1.

The shaft system provided by the present disclosure is provided with thrust bearings 4 on both axial sides of the radial bearing composed of the bearing unit 7 and the first bearing seat 2, so as to be able to withstand radial force and axial force at the same time, thereby improving the adaptability of the shaft system.

In order to improve the service life of the thrust bearing 4, the end surface of the second end of the thrust bearing 4 is provided with a wear-resistant layer 48, and the wear-resistant layer 48 can be made of wear-resistant materials. The thrust bearing 4 can be made of ordinary bearing materials, for example but not limited to, the thrust bearing 4 can be a steel part, so that the service life of the thrust bearing 4 can be effectively improved without increasing the manufacturing cost of the thrust bearing 4. Similarly, a wear-resistant layer is provided on the axial end surface of the first bearing seat 2 that is in sliding contact with the thrust bearing 4, or a wear-resistant layer is provided on the end surface of the end flange 5 that is in sliding contact with the thrust bearing 4, but it is not limited thereto.

Referring to Figure 2, the thrust bearing 4 includes a first support seat 41 and a first pad steel back 44. The first support seat 41 is connected to the first bearing seat 2 or the end flange 5. The first support seat 41 is provided with a plurality of pad accommodating grooves 47. The plurality of pad accommodating grooves 47 are arranged at intervals along the circumference of the rotating shaft 1. The first pad steel back 44 is movably arranged in the pad accommodating grooves 47 to support the first bearing seat 2 or the end flange 5, thereby avoiding excessive wear of the first bearing seat 2 or the end flange 5.

Furthermore, in order to increase the service life of the first pad steel back 44 and the service life of the thrust bearing 4, a wear-resistant layer 48 is provided on the wall surface of the first pad steel back 44 facing the first bearing seat 2 or the end flange 5 matched therewith.

In order to further improve the service life of the first pad steel back 44, the first bearing seat 2 or the end flange 5 is provided with an oil inlet channel (not shown). As an example, the oil inlet channel extends radially along the first support seat 41, but is not limited thereto. Further, the first support seat 41 is provided with an arc-shaped oil groove 46, and the arc-shaped oil groove 46 extends continuously along the circumference of the first support seat 41, for example but not limited to, the arc-shaped oil groove 46 extends in an arc shape. A plurality of pad receiving grooves 47 are respectively connected to the arc-shaped oil groove 46 to guide external lubricating oil into the pad receiving groove 47 through the oil inlet channel to provide lubrication for the first pad steel back 44. As an example, the arc-shaped oil groove 46 provided in the present disclosure is arranged radially outside the circumference of the pad receiving groove 47, but is not limited thereto.

In order to connect the arc-shaped oil groove 46 and the oil inlet channel, an axial oil groove (not shown) is also provided between the arc-shaped oil groove 46 and the oil inlet channel. As an example, the axial oil groove is provided on the first support seat 41, but not limited thereto. Optionally, the axial oil groove can also be provided on the first bearing seat 2 or the end flange 5, but not limited thereto. As an example, the arc-shaped oil groove 46 is provided on the end face of the first support seat 41 so as to be able to communicate with the tile receiving groove 47, and the oil inlet channel can be provided at a non-end face position of the first support seat 41 to prevent lubricating oil leakage and contamination.

In order to improve the utilization rate of lubricating oil, the thrust bearing 4 further includes a sealing ring 45, which is sleeved on the outer periphery of the first pad steel back 44 and pressed tightly against the groove between the first pad steel back 44 and the pad receiving groove 47. As an example, the first pad steel back 44 of the present disclosure is cylindrical, and the axis of the first pad steel back 44 is arranged parallel to the axis of the rotating shaft 1, but not limited to this. In this way, the sealing ring 45 seals the lubricating oil to prevent the lubricating oil from leaking to the side of the first elastic pad 43, causing waste of lubricating oil.

As an example, a sealing ring groove is recessed in the outer peripheral wall of the first pad steel back 44, and the sealing ring 45 is pressed between the sealing ring groove and the groove wall of the pad receiving groove 47, but not limited to this, thereby further improving the sealing performance of the thrust bearing.

In order to improve the reliability of the thrust bearing, the first pad steel back 44 is kept in contact with the first bearing seat 2, and a first elastic pad 43 is provided on the side of the first pad steel back 44 away from the first bearing seat 2. The first elastic pad 43 is provided between the first pad steel back 44 and the bottom of the pad receiving groove 47, and the first elastic pad 43 is pressed between the bottom of the pad receiving groove 47 and the first pad steel back 44. As an example, the first elastic pad 43 provided in the present disclosure is a rubber part, or a silicone part, but is not limited thereto. In this way, the first pad steel back 44 can be kept in contact with the first bearing seat 2 by providing the first elastic pad 43.

In order to further improve the reliability of the thrust bearing 4, the thrust bearing 4 also includes a limit ring 42, which is arranged between the first elastic pad 43 and the groove wall of the shoe accommodating groove 47. In this way, by arranging the limit ring 42 on the outer periphery of the first elastic pad 43, it can be used to radially limit the first elastic pad 43 to prevent the first elastic pad 43 from moving during the operation of the thrust bearing 4.

As an example, the first elastic pad 43 provided in the present disclosure may be a column, for example but not limited to, the diameter of the first elastic pad 43 is not greater than the diameter of the first pad steel back 44 .

1 , in this embodiment, the thrust bearings 4 are arranged in pairs, and the above embodiment discloses the structure of the thrust bearing 4 arranged on the axial outer side of the first bearing seat 2 .

In order to facilitate replacement and reduce maintenance costs, the first support seat 41 can be an arc-shaped structure, and multiple first support seats 41 are arranged along the circumference of the rotating shaft 1 to form a ring. It is understandable that the first support seat 41 can also be a ring that extends continuously along the circumference of the rotating shaft 1, which is also within the protection scope of the present disclosure.

As an example, a fastener mounting hole 49 is provided on the first support seat 41 , and the thrust bearing 4 can be connected to the end flange or the first bearing seat 2 by arranging a fastener in the fastener mounting hole 49 .

The thrust bearing 4 provided in the present disclosure is a sliding bearing, which can be used as a main bearing to support the main shaft of a wind turbine generator set. The sliding bearing has the characteristics of high load-bearing capacity, high stability, impact resistance, low cost and easy maintenance.

The bearing assembly provided by the present invention is suitable for use as a wind power axial thrust sliding bearing, and fully considers the lubrication, installation, maintenance, processing and operating performance requirements of the bearing, and provides a wind power main bearing application. A better solution has been provided, which is conducive to cost reduction in the industry.

The shaft system provided by the present invention includes a first bearing seat 2 and a second bearing seat 3, and the first bearing seat 2 and the second bearing seat 3 are independently arranged respectively, forming a split bearing seat. A single bearing seat is small in size and light in weight, thereby reducing the cost of the shaft system and simplifying the maintenance of each bearing.

1 and 5, in order to improve the connection strength of the end flange 5, the end flange 5 includes a first end flange 51 disposed on the first bearing seat 2 along the axial inner side of the rotating shaft 1. In order to prevent the first end flange 51 from axially moving relative to the rotating shaft 1, a step 6 is disposed on the outer peripheral wall of the rotating shaft 1, and the axial inner end of the first end flange 51 abuts against the step 6. As an example, the outer diameter of the axial inner end of the first end flange 51 is the same as the diameter of the radial outer end of the step 6, that is, the connection between the axial inner end of the first end flange 51 and the step 6 is smoothly transitioned.

1 and 6 , further, the end flange 5 also includes a second end flange 52 disposed on the axially outer side of the first bearing seat 2 along the rotating shaft 1 , and the second end flange 52 is detachably connected to the end face of the first end of the rotating shaft 1 .

As an example, the second end flange 52 is detachably connected to the end face of the rotating shaft 1 by fasteners. For example, but not limited to, the end face of the first end of the rotating shaft 1 can be provided with a plurality of fastener mounting holes, and the plurality of fastener mounting holes are arranged at intervals along the circumference of the rotating shaft 1. The second end flange 52 is provided with a plurality of fastener mounting holes arranged in alignment with the fastener mounting holes. By respectively setting the fasteners in the first end fastener mounting holes of the rotating shaft 1 and the fastener mounting holes of the second end flange 52, the second end flange 52 can be connected to the first end of the rotating shaft 1, but it is not limited to this.

3 and 4, an exemplary embodiment of the present disclosure provides a sliding bearing assembly, which includes a bearing seat and a plurality of bearing units 7. In this embodiment, the bearing seat is a second bearing seat 3, but the present invention is not limited thereto. The bearing seat has an accommodating cavity. The plurality of bearing units 7 are arranged in the accommodating cavity at intervals along the circumference of the accommodating cavity, so as to be supported on the circumferential outer side of the rotating shaft 1.

The present disclosure arranges a plurality of bearing units 7 in the accommodating cavity of the second bearing seat 3. The plurality of bearing units 7 are independent of each other and are convenient for independent disassembly and assembly, and are particularly suitable for disassembly and assembly on a tower, thereby reducing the operation and maintenance cost of the sliding bearing assembly.

Specifically, the bearing unit 7 includes a second support seat 71 and a second pad steel back 72. The second support seat 71 is fixed on the second bearing seat 3. The second pad steel back 72 is movably connected to the second support seat 71. The side of the second pad steel back 72 facing away from the second support seat 71 is provided with a shaft support surface for supporting the shaft 1.

In order to increase the service life of the sliding bearing assembly, the shaft support surface and the outer peripheral wall of the shaft 1 are at least One is provided with a wear-resistant layer. As an example, the wear-resistant layer is provided on the shaft support surface of the second pad steel back 72, and can also be provided on the outer peripheral wall of the shaft 1. Optionally, a wear-resistant layer is bonded or coated on the shaft support surface of the second pad steel back 72 and the shaft 1 to improve the wear resistance and reduce the friction resistance of the sliding bearing assembly.

In this embodiment, the second support seat 71 is fixed on the second bearing seat 3, so that the second pad steel back 72 can be movably connected to the second bearing seat 3 through the second support seat 71 to adapt to the axial force, thereby improving the adaptability of the sliding bearing assembly.

As an example, the second support seat 71 can be connected to the second bearing seat 3 by fasteners, but not limited thereto. As an example, the second support seat 71 is roughly a square plate structure, and the four corners of the square plate are respectively connected to the second bearing seat 3 by fasteners, but not limited thereto.

Furthermore, in order to facilitate the assembly of the second support seat 71, the bearing unit 7 also includes a fixing plate (not shown), which is arranged at the axial end of the second support seat 71 along the rotating shaft 1, and the fixing plate is fixed on the second bearing seat 3, and the second support seat 71 is fixed on the fixing plate.

In order to improve the assembly efficiency of the sliding bearing assembly, the cavity wall of the accommodating cavity of the second bearing seat 3 is recessed with an installation groove, and the side of the second support seat 71 away from the second tile steel back 72 is embedded in the installation groove. This arrangement facilitates the assembly and positioning of the second support seat 71, thereby improving the assembly efficiency of the sliding bearing assembly.

As an example, the fixing plate can be fixed on the inner wall of the second bearing seat 3 by fasteners in advance, and the fixing plate can be used as an axial limiter, and the size of the fixing plate in the radial direction of the rotating shaft 1 matches the second support seat 71, so as to avoid the fixing plate from interfering with the second tile steel back 72. Furthermore, a groove matching the axial end of the second support seat 71 on the rotating shaft 1 can be provided on the side of the fixing plate facing the second support seat 71, and the end of the second support seat 71 can be inserted into the groove, so that the second support seat 71 is stably connected to the fixing plate, thereby improving the connection reliability of the second support seat 71.

In order to further improve the connection reliability of the second support seat 71 and prevent the second support seat 71 from axially moving relative to the second bearing seat 3 along the shaft 1, fasteners are respectively provided on both sides of the second support seat 71 along the circumference of the shaft 1. The fasteners extend approximately along the axial direction of the shaft 1 and are connected between the second support seat 71 and the fixing plate. In order to facilitate disassembly and assembly, the nut end of the fastener can be exposed to facilitate operation, thereby improving the convenience of disassembly and assembly.

Optionally, the second support seat 71 and the fixing plate may be fixedly connected by adhesive or the like, but the present invention is not limited thereto.

Specifically, each second support seat 71 has a mounting groove corresponding to the second bearing seat 3. During the assembly process, the fixing plate can be firstly connected to the second bearing seat 3 by two fasteners (such as but not limited to screws). The bearing seat 3 is fixed, and then the second support seat 71 is pushed into the groove of the fixing plate, and then the remaining fasteners are installed on the second support seat 71, so that the second support seat 71 is connected to the fixing plate and the second bearing seat 3.

The bearing unit 7 also includes a pin 73, which is arranged parallel to the diameter of the rotating shaft 1. The pin 73 is connected between the second support seat 71 and the second pad steel back 72. The second pad steel back 72 is provided with a steel back mounting hole arranged in alignment with the support plate mounting hole (not shown), and the pin 73 and the steel back mounting hole are in clearance. In this embodiment, the pin 73 is mainly used to connect the second pad steel back 72 and the second support seat 71, and to limit the second pad steel back 72 in the circumferential direction of the rotating shaft 1 to prevent the second pad steel back 72 from accidentally detaching from the second support seat 71.

As an example, the second support seat 71 is provided with a support plate mounting hole for the pin shaft 73 to pass through, and the first end of the pin shaft 73 is interference-fitted with the support plate mounting hole to prevent the pin shaft 73 from accidentally moving relative to the second support seat 71, thereby improving the connection reliability between the second pad steel back 72 and the second support seat 71. It can be understood that the pin shaft 73 is fixed to the second support seat 71, and the second pad steel back 72 can swing around the circumference of the pin shaft 73 relative to the pin shaft 73, and move relative to the pin shaft 73 along its axial direction, so as to improve the adaptability of the sliding bearing assembly, but it is not limited thereto.

Furthermore, the second end of the pin 73 is in clearance with the steel back mounting hole, so that the second tile steel back 72 can be movably connected relative to the second support seat 71. As an example, the steel back mounting hole can be a blind hole, and the end of the second end of the pin 73 is spaced apart from the bottom of the steel back mounting hole, so that the second tile steel back 72 can move relative to the pin 73 along the axial direction of the pin 73 to adapt to different working conditions. Furthermore, the end of the second end of the pin 73 is spaced apart from the bottom of the steel back mounting hole, so that when the second tile steel back 72 is subjected to the radial force of the rotating shaft 1, the pin 73 can be prevented from being subjected to the force along its axial direction, thereby increasing the service life of the pin 73.

As an example, the second shoe steel back 72 and the second support seat 71 are respectively made of metal to have higher rigidity.

In order to increase the service life of the sliding bearing assembly and avoid wear caused by rigid contact between the second pad steel back 72 and the second support seat 71, the bearing unit 7 also includes a second elastic pad 74, which is supported between the second support seat 71 and the second pad steel back 72. The second elastic pad 74 is symmetrically arranged relative to the pin 73 along the circumference of the rotating shaft 1. In this way, by arranging the second elastic pad 74 between the second support seat 71 and the second pad steel back 72, the second pad steel back 72 is kept in contact with the outer peripheral wall of the rotating shaft 1, thereby improving the reliability of the sliding bearing assembly. Furthermore, the second elastic pad 74 is deformed under pressure, so that the rotating shaft 1 has a predetermined travel space in the radial direction, thereby improving the reliability of the sliding bearing assembly. Adaptability. As an example, the second elastic pad 74 can be made of a polymer material, and the provision of the second elastic pad 74 increases the sensitivity of the bearing stiffness to the formation of a dynamic pressure oil film of the sliding bearing.

As an example, the pin 73 is parallel to the diameter of the rotating shaft 1 and is offset from the diameter of the rotating shaft 1, that is, the pin 73 is offset relative to the center line of the second pad steel back 72 along the circumferential direction of the rotating shaft 1. The pin 73 has a certain offset value along the rotation direction of the rotating shaft 1, and the offset value enables the sliding bearing assembly to better form a dynamic pressure oil film. Further, the pin 73 is arranged on the center line of the second elastic pad 74 along the circumferential direction of the rotating shaft 1, that is, the second elastic pad 74 is non-centered relative to the second pad steel back 72, but it is not limited to this.

In order to further improve the reliability of the sliding bearing assembly and maintain the smooth rotation of the shaft 1, the second pad steel back 72 is provided with an oil inlet channel 221, one end of which is connected to the oil pump through the external pipe 26, and the other end is connected to the shaft support surface. In this way, a dynamic pressure oil film is easily formed between the shaft support surface of the second pad steel back 72 and the outer peripheral wall of the shaft 1, which improves the smoothness of the rotation of the shaft 1. On the other hand, it also increases the service life of the shaft 1 and the sliding bearing assembly, and reduces the operation and maintenance cost.

In the lubrication method in which each second pad steel back 72 is independently supplied with oil, the lubricating oil is sprayed into the oil channel of the second pad steel back 72 through the oil inlet channel 221, then flows to the shaft support surface that rubs against the shaft 1, and then flows out from the second bearing seat 3 under the action of gravity, thereby achieving the purpose of circulating oil supply.

As an example, the bearing units 7 are arranged in pairs, and each pair of bearing units 7 is arranged symmetrically with respect to the center. In this way, the sliding bearing assembly can withstand the force in the radial direction of the rotating shaft 1, thereby improving the applicability of the sliding bearing assembly. In the description of the present disclosure, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

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

The features, structures or characteristics described in the present disclosure may be combined in one or more embodiments in any suitable manner. In the above description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

Claims (18)

A shaft system, characterized in that the shaft system comprises: Rotating shaft (1), A first bearing seat (2) is arranged at a first end of the rotating shaft (1). A second bearing seat (3) is arranged on the rotating shaft (1) and is spaced apart from the first bearing seat (2), wherein the rotating shaft (1) is rotatably arranged on the first bearing seat (2) and the second bearing seat (3), and a pair of thrust bearings (4) are respectively arranged on both axial sides of the first bearing seat (2). The shaft system according to claim 1 is characterized in that a pair of end flanges (5) are provided at the first end of the rotating shaft (1), the pair of end flanges (5) are spaced apart on both axial sides of the first bearing seat (2), and a pair of thrust bearings (4) are respectively provided between the end flanges (5) and the first bearing seat (2). The shaft system according to claim 1, characterized in that the shaft system further comprises a bearing unit (7), wherein the bearing unit (7) is arranged between a pair of the thrust bearings (4) along the axial direction of the rotating shaft (1), and the bearing unit (7) is arranged on the radial inner side of the first bearing seat (2), so that the bearing unit (7) is supported between the first bearing seat (2) and the rotating shaft (1); and/or, The shaft system further comprises a bearing unit (7), wherein the bearing unit (7) is arranged radially inwardly of the second bearing seat (3) and supported between the second bearing seat (3) and the rotating shaft (1). The shaft system according to claim 2, characterized in that the first end of the thrust bearing (4) is connected to the end flange (5), and the second end of the thrust bearing (4) faces the first bearing seat (2) and is in sliding contact with the first bearing seat (2); or, The first end of the thrust bearing (4) is connected to the first bearing seat (2), and the second end of the thrust bearing (4) faces the end flange (5) and is in sliding contact with the end flange (5). The shaft system according to claim 4, characterized in that the end surface of the second end of the thrust bearing (4) is provided with a wear-resistant layer; and/or, The axial end surface of the first bearing seat (2) in sliding contact with the thrust bearing (4) is provided with a wear-resistant layer; and/or, The end surface of the end flange (5) in sliding contact with the thrust bearing (4) is provided with a wear-resistant layer. The shaft system according to claim 2, characterized in that the end flange (5) comprises a A first end flange (51) is disposed on the first bearing seat (2) along the axial inner side of the rotating shaft (1); the outer peripheral wall of the rotating shaft (1) is provided with a step (6); and the axial inner end of the first end flange (51) abuts against the step (6). The shaft system according to claim 6 is characterized in that the end flange (5) also includes a second end flange (52) arranged on the axial outside of the first bearing seat (2) along the rotating shaft (1), and the second end flange (52) is detachably connected to the end face of the first end of the rotating shaft (1). The shaft system as described in claim 1 is characterized in that the thrust bearing (4) includes a first support seat (41) and a first pad steel back (44), the first support seat (41) is connected to the first bearing seat (2), the first support seat (41) is provided with a plurality of pad accommodating grooves (47), the plurality of pad accommodating grooves (47) are arranged at intervals along the circumference of the first bearing seat (2), and the first pad steel back (44) is movably arranged in the pad accommodating groove (47). The shaft system according to claim 8 is characterized in that the thrust bearing (4) further includes a first elastic pad (43), and the first elastic pad (43) is arranged and pressed between the first shoe steel back (44) and the bottom of the shoe accommodating groove (47). The shaft system as described in claim 8 is characterized in that the first pad steel back (44) is cylindrical, the pad receiving groove (47) matches the first pad steel back (44), and the outer peripheral wall of the first pad steel back (44) is provided with a sealing ring (45), and the sealing ring (45) is pressed between the first pad steel back (44) and the bottom of the pad receiving groove (47). The shaft system according to claim 9 is characterized in that the thrust bearing (4) further includes a limiting ring (42), and the limiting ring (42) is arranged between the first elastic pad (43) and the groove wall of the shoe accommodating groove (47). The shaft system as described in claim 3 is characterized in that the bearing unit (7) includes a second support seat (71) and a second pad steel back (72), the second support seat (71) is fixed on the bearing seat, the second pad steel back (72) is movably connected to the second support seat (71), and a shaft support surface for supporting the shaft (1) is provided on the side of the second pad steel back (72) facing away from the second support seat (71). The shaft system as described in claim 12 is characterized in that the bearing unit (7) also includes a pin shaft (73), the pin shaft (73) is arranged parallel to the diameter of the rotating shaft (1), the pin shaft (73) is connected between the second support seat (71) and the second tile steel back (72), the second tile steel back (72) is provided with a steel back mounting hole, and the pin shaft (73) is clearance-matched with the steel back mounting hole. The shaft system as described in claim 13 is characterized in that the second support seat (71) is provided with a support plate mounting hole for the pin shaft (73) to pass through, the support plate mounting hole is arranged in alignment with the steel back mounting hole, the first end of the pin shaft (73) is interference fit with the support plate mounting hole, and the second end of the pin shaft (73) is clearance fit with the steel back mounting hole. The shaft system according to claim 13 is characterized in that the bearing unit (7) also includes a second elastic pad (74) supported between the second support seat (71) and the second pad steel back (72), and the second elastic pad (74) is symmetrically arranged relative to the pin shaft (73) along the circumference of the rotating shaft (1). The shaft system according to claim 14 is characterized in that the pin shaft (73) is arranged parallel to the diameter of the rotating shaft (1), and the pin shaft (73) and the second shoe steel back (72) are staggered along the circumferential center line of the rotating shaft (1). A wind turbine generator set, characterized in that the wind turbine generator set comprises a shaft system according to any one of claims 1-16. The wind turbine generator set according to claim 17 is characterized in that the wind turbine generator set also includes an impeller and a generator, the rotating shaft (1) is the main shaft of the wind turbine generator set, and the rotating shaft (1) connects the impeller and the generator.