Shafting, wind generating set and fault bearing bush diagnosis method of shafting
By setting up a temperature detection device and positioning device on the rotating shaft of the main bearing of the wind power to monitor and diagnose the faulty bearing in real time, the problem of high fault detection cost of the main bearing of the wind power to be solved, and the effect of accurate diagnosis of the faulty bearing and reducing maintenance costs is achieved.
Patent Information
- Application Number
- CN202311870094.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-01-14
AI Technical Summary
The fault detection cost of wind power main bearings is high and the maintenance cycle is long. It is difficult for the existing technology to achieve real-time temperature monitoring and fault diagnosis, resulting in economic losses.
A temperature detection device is provided on the rotating shaft. The bearing shell temperature arranged along the circumference of the rotating shaft is detected by rotating the shaft. The feedback signal is outputted with the position positioning device, and the temperature information is obtained in real time and the fault bearing shell position is determined, which simplifies the structure and reduces costs.
Accurate diagnosis of faulty bearings is achieved, maintenance costs and economic losses are reduced, and the operation efficiency and reliability of wind turbines are improved.
Smart Images
Figure CN119308812A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to a shaft system, a wind power generator set and a method for diagnosing faulty bearings of the shaft system. Background Art
[0002] With the development of wind power industry, the capacity of units is increasing, which puts higher requirements on the load-bearing capacity of main bearings. Sliding main bearings have become a technical means widely concerned by the wind power industry due to their high load-bearing capacity, high stability, impact resistance, low cost and easy maintenance.
[0003] The wind turbine main bearing is a kind of sliding bearing with large load capacity and low working speed. It is subjected to large impact load, radial force, axial force, overturning moment, etc. during operation. It is located at the front end of the transmission chain and connected to the blades. If a failure occurs, it will directly affect the operation of the wind turbine generator set. The corresponding maintenance and replacement cycle is long, which will lead to large economic losses. Therefore, it is necessary to monitor the temperature of the sliding main bearing in real time.
[0004] Sliding bearings usually include multiple bearing shells, and a detection device is usually set on each bearing shell. Due to the excessive number of detection devices, the procurement cost and installation cost increase sharply. Summary of the invention
[0005] The main purpose of the present disclosure is to provide a shaft system, a wind turbine generator set and a shaft system faulty bearing diagnosis method, so as to diagnose the faulty bearing and reduce the maintenance cost of the bearing.
[0006] In view of the above main objectives, the present disclosure provides the following technical solutions:
[0007] In one aspect of the present disclosure, a shaft system is provided, which includes a rotating shaft, a bearing seat, a plurality of bearing shells and a first temperature detection device, wherein the bearing seat is provided with a mounting hole for allowing the rotating shaft to pass through, and the rotating shaft is rotatably disposed in the mounting hole; the plurality of bearing shells are arranged between the bearing seat and the rotating shaft at intervals along the circumference of the rotating shaft, the first temperature detection device is arranged on the rotating shaft and is aligned with the circular ring where the bearing shells are located, and the first temperature detection device can detect the temperature of the bearing shells so as to determine the position of the bearing shells with abnormal temperature.
[0008] The present invention discloses a first temperature detection device disposed on a rotating shaft. During the rotation of the rotating shaft, the first temperature detection device can rotate relative to the bearing together with the rotating shaft. During this process, the first temperature detection device can be used to detect the temperatures of different bearings arranged along the circumference of the rotating shaft, thereby determining the position of the bearing with abnormal temperature.
[0009] According to an exemplary embodiment of the present disclosure, the shaft system further comprises a position positioning device, which is disposed on the bearing seat or on one of the plurality of bearing shells, and is used to detect position information of the first temperature detection device and output a feedback signal.
[0010] The present invention realizes the rotation of the first temperature detection device relative to the bearing shell by arranging the first temperature detection device on the rotating shaft so that the rotating shaft rotates relative to the bearing shell, thereby realizing that the first temperature detection device can measure the temperature of different bearing shells, thereby simplifying the structure of the shaft system and reducing the manufacturing cost of the shaft system.
[0011] In an exemplary embodiment of the present disclosure, one of the first temperature detection device and the position positioning device includes a signal generator, and the other includes a signal receiver that can match the signal generator. When the first temperature detection device and the position positioning device meet, the signal receiver outputs the feedback signal. In this way, the position positioning of the first temperature detection device is achieved through signal interaction between the first temperature detection device and the position positioning device, with a simple structure and reliable principle.
[0012] Optionally, there are multiple first temperature detection devices, and the multiple first temperature detection devices are evenly arranged along the circumference of the rotating shaft. Such an arrangement improves the detection accuracy of faulty bearings.
[0013] Specifically, the first temperature detection device includes an infrared temperature sensor, or a thermocouple sensor, or a thermistor sensor, or a nanothermistor sensor.
[0014] Furthermore, the bearing seat includes a radial bearing seat, the bearing shell includes a radial bearing shell, the radial bearing shell is arranged on the outer peripheral side of the rotating shaft, the first temperature detection device extends radially inward from the outer peripheral wall of the rotating shaft, and the position positioning device is embedded in the radial bearing shell. In this arrangement, by embedding the first temperature detection device in the rotating shaft, the first temperature detection device and the bearing shell are prevented from generating motion interference during the rotation of the rotating shaft relative to the bearing shell. By embedding the position positioning device in the bearing shell, the position positioning device and the rotating shaft are prevented from generating motion interference during the rotation of the rotating shaft relative to the bearing shell.
[0015] According to another exemplary embodiment of the present disclosure, the bearing seat includes a thrust bearing seat, the bearing shell includes a thrust bearing shell, the shaft system includes a thrust plate, the thrust plate radially protrudes and extends from the outer peripheral surface of the rotating shaft, the thrust bearing shell is arranged on the axial side of the thrust plate along the rotating shaft, the position positioning device is embedded in the thrust bearing shell, and the first temperature detection device extends from the axial end surface of the thrust plate in a direction away from the thrust bearing shell. In this arrangement, the position positioning device is embedded in the thrust bearing shell, thereby avoiding motion interference between the position positioning device and the rotating shaft during the rotation of the rotating shaft relative to the bearing shell. Furthermore, the first temperature detection device extends from the axial end surface of the thrust plate in a direction away from the thrust bearing shell, thereby avoiding motion interference between the first temperature detection device and the rotating shaft during the rotation of the rotating shaft relative to the bearing shell.
[0016] Optionally, the shaft system further includes a speed sensor and a controller, wherein the speed sensor is used to detect the speed of the rotating shaft, and the controller receives the temperature detection information of the first temperature detection device. When the temperature of the first temperature detection device is abnormal, the position of the bearing shell at the temperature abnormality is determined according to the speed of the rotating shaft and the time of the temperature abnormality. The present disclosure detects the temperatures of multiple bearing shells through the first temperature detection device to check the faulty bearing shells, and outputs the position information of the first temperature detection device through the position positioning device, so that the position of the faulty bearing shell can be detected through the cooperation of the first temperature detection device and the position positioning device.
[0017] Specifically, the position positioning device includes a second temperature detection device, and the position positioning device extends from the bearing shell toward the side wall of the rotating shaft toward the direction away from the bearing shell. When the first temperature detection device meets the position positioning device, one of the position positioning device and the first temperature detection device outputs the feedback signal. In this arrangement, the position positioning device includes a second temperature detection device to cooperate with the first temperature detection device to perform initial positioning on the first temperature detection device, and the structure is simple, thereby further reducing the manufacturing cost of the shaft system.
[0018] Furthermore, the shaft system also includes a timer and a speed sensor. The timer can record the first moment t0 when the feedback signal occurs. When the temperature detection information is abnormal, the timer can record the second moment t1 of the current bearing temperature. The speed sensor is used to detect the rotation speed of the shaft. The position of the bearing where the temperature detection information is abnormal is determined according to the first moment t0 and the second moment t1 and the rotation speed of the shaft. In this way, the time Δt taken by the first temperature detection device to move from the initial point to the position where the faulty bearing is located is determined by the first moment t0 and the second moment t1, and then the position of the faulty bearing is calculated according to the product of the rotation speed of the shaft and the time Δt. The structure is reliable and the principle is simple.
[0019] In another exemplary embodiment of the present disclosure, a plurality of the first temperature detection devices are numbered in sequence clockwise along the circumference of the rotating shaft, the shaft system further includes a rotation speed sensor and a controller, the rotation speed sensor is used to detect the rotation speed of the rotating shaft, and the controller receives temperature detection information of the first temperature detection device,
[0020] When the temperature detection information of the first temperature detection device numbered A is abnormal, the recording time is the third moment t3,
[0021] When the first temperature detection device numbered N outputs a feedback signal, the time is recorded as the fourth moment t4 and the current rotation speed of the current shaft is recorded,
[0022] Determine the position of the first temperature detection device numbered N at the third moment t3 according to the third moment t3, the fourth moment t4 and the current rotation speed of the rotating shaft;
[0023] The position of the first temperature detection device numbered A at the third time t3 is determined based on the central angle between the first temperature detection device numbered A and the first temperature detection device numbered N and the radius length of the rotating shaft, thereby determining the position of the bearing where the bearing temperature detection information is abnormal. In another aspect of the present disclosure, a wind turbine generator set is provided, the wind turbine generator set comprising a tower, an impeller rotatably connected to the tower, a generator, and a shaft system as described above, the shaft system being arranged between the impeller and the generator, and the two ends of the rotating shaft being respectively connected to the rotor of the generator and the impeller.
[0024] In another aspect of the present disclosure, a method for diagnosing a faulty bearing of a shaft system is provided, which is applicable to the shaft system as described above. The method for diagnosing a faulty bearing of a shaft system comprises:
[0025] During the rotation of the shaft, the temperature detection information of each bearing bush is obtained in real time.
[0026] When the temperature detection information is abnormal, the position of the bearing where the temperature detection information is abnormal is determined according to the rotation speed of the shaft and the time when the temperature detection information is abnormal.
[0027] In an exemplary embodiment of the present disclosure, the shaft system includes a position positioning device 4, which is used to detect the position information of the first temperature detection device 3 and output a feedback signal, wherein when the temperature detection information is abnormal, the position of the bearing 1 at the abnormal temperature detection information is determined according to the rotation speed of the shaft and the time when the temperature detection information is abnormal, including:
[0028] Acquire the feedback signal and the first time t0 when the feedback signal occurs;
[0029] When the temperature detection information is abnormal, the second time t1 when the current bearing temperature is obtained;
[0030] The position of the bearing 1 where the temperature detection information of the first temperature detection device 3 is abnormal is determined according to the first time t0 and the second time t1 and the rotation speed of the shaft 2. Another exemplary embodiment of the present disclosure provides a method for diagnosing a faulty bearing of a shaft system, which is applicable to the shaft system as described above, and the plurality of first temperature detection devices are numbered in sequence clockwise along the circumference of the shaft, and the method for diagnosing a faulty bearing of the shaft system comprises:
[0031] Acquire in real time the bearing temperatures detected by the plurality of first temperature detection devices;
[0032] When the bearing temperature information detected by the first temperature detection device numbered A is abnormal, the time is obtained and recorded as the third moment t3,
[0033] When the feedback signal of the first temperature detection device numbered N is obtained, the time is obtained and recorded as the fourth moment t4,
[0034] Determine the position of the first temperature detection device numbered N at the third moment t3 according to the third moment t3, the fourth moment t4 and the current rotation speed of the rotating shaft;
[0035] According to the central angle between the first temperature detection device numbered A and the first temperature detection device numbered N and the radius length of the rotating shaft, the position of the first temperature detection device numbered A at the third moment t3 is determined, thereby determining the position of the bearing where the bearing temperature information is abnormal.
[0036] According to another exemplary embodiment of the present disclosure, the first temperature detection device numbered N is the first temperature detection device that first meets the position positioning device after a third time t3. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] 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:
[0038] Figure 1 A schematic structural diagram of a shaft system provided for the first exemplary embodiment of the present disclosure.
[0039] Figure 2 for Figure 1 Cross-section of the central axis system.
[0040] Figure 3 A schematic structural diagram of a shaft system provided for a second exemplary embodiment of the present disclosure.
[0041] Figure 4 for Figure 3 Cross-section of the shaft system.
[0042] Figure 5 A schematic structural diagram of a shaft system provided for a third exemplary embodiment of the present disclosure.
[0043] Figure 6 A flowchart of a method for diagnosing a faulty bearing of a shaft system provided for the first exemplary embodiment of the present disclosure.
[0044] Figure 7 A flowchart of a method for diagnosing a faulty bearing of a shaft system provided for a second exemplary embodiment of the present disclosure.
[0045] Description of reference numerals:
[0046] 1. Bearing; 2. Rotating shaft;
[0047] 3. Temperature detection device; 4. Position positioning device;
[0048] 5. Thrust plate; 6. Bearing seat;
[0049] 11. Radial bearing; 12. Thrust bearing;
[0050] 61. Radial bearing seat; 62. Thrust bearing seat. DETAILED DESCRIPTION
[0051] 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.
[0052] The present disclosure provides a shaft system, which may be applicable to a wind turbine generator set as an example.
[0053] In another aspect, the present disclosure further provides a wind turbine generator set, which includes the above-mentioned shaft system. According to needs, the wind turbine generator set can be an onshore wind turbine generator set or an offshore wind turbine generator set.
[0054] The wind turbine generator set includes a tower, an impeller rotatably connected to the tower, a generator and the shaft system as described above. The shaft system is arranged between the impeller and the generator. The shaft system includes a rotating shaft 2, and the two ends of the rotating shaft 2 are respectively connected to the rotor and the impeller of the generator. The rotation of the impeller drives the generator to generate electricity; of course, the two ends of the rotating shaft 2 can also be respectively connected to the input end and the impeller of the gear box, and the rotating shaft is connected to the rotor of the generator through the transmission speed change of the gear box.
[0055] Reference Figures 1 to 5The shaft system provided in this embodiment includes a rotating shaft 2, a bearing seat 6, a plurality of bearing bushes 1 and a first temperature detection device 3. The bearing seat 6 is provided with a mounting hole for the rotating shaft 2 to pass through, and the rotating shaft 2 is rotatably arranged in the mounting hole. The plurality of bearing bushes 1 are arranged between the bearing seat 6 and the rotating shaft 2 at intervals along the circumference of the rotating shaft 2. The first temperature detection device 3 is arranged on the rotating shaft 2 and is arranged in alignment with the circular ring where the bearing bushes 1 are located. The first temperature detection device 3 can detect the temperature of the bearing bushes 1.
[0056] When the bearing 1 fails, the friction between the bearing 1 and the rotating shaft 2 increases, causing the temperature of the bearing 1 to rise. Therefore, when the temperature detected by the first temperature detection device 3 is greater than the predetermined value, it can be considered that the bearing 1 has failed. At this time, the bearing temperature information of the first temperature detection device 3 is abnormal, but not limited to this.
[0057] The present invention realizes that the first temperature detection device 3 rotates relative to the bearing shell 1 by arranging the first temperature detection device 3 on the rotating shaft 2 so as to realize the first temperature detection device 3 to measure the temperature of different bearing shells 1, thereby simplifying the structure of the shaft system and reducing the manufacturing cost of the shaft system.
[0058] The embodiment provided in the present disclosure is described by taking the case where the bearing temperature information of the first temperature detection device 3 is abnormal and the temperature information is greater than a predetermined temperature threshold as an example, but the invention is not limited thereto.
[0059] The shaft system provided by the present disclosure further includes a position positioning device 4, which is disposed on the bearing seat 6 or on one of the plurality of bearing shells 1, and is used to output a feedback signal when the first temperature detection device 3 reaches a predetermined position.
[0060] The present invention detects the temperatures of multiple bearings 1 through a first temperature detection device 3 to check for faulty bearings 1, and outputs the location information of the first temperature detection device 3 through a position positioning device 4. In this way, the location of the faulty bearing 1 can be detected through the cooperation of the first temperature detection device 3 and the position positioning device 4.
[0061] In this embodiment, when the first temperature detection device 3 rotates to meet the position positioning device 4, the position positioning device 4 can output a feedback signal, but the present invention is not limited thereto.
[0062] Furthermore, when the bearings 1 are normal, the bearings 1 and the shaft 2 are normally lubricated, and the temperature of each bearing 1 is within a predetermined range. When the bearing 1 fails, the lubrication between the bearing 1 and the shaft 2 fails, and the temperature of the bearing 1 rises due to friction and exceeds a predetermined threshold. The first temperature detection device 3 is used to detect the temperature detection information of each bearing 1. The position positioning device 4 is used to detect the position of the first temperature detection device 3 in real time, and can output a feedback signal for the position information of the first temperature detection device 3, and the position of the faulty bearing 1 can be obtained according to the feedback signal.
[0063] Optionally, the shaft system also includes a speed sensor and a controller, the speed sensor is used to detect the speed of the rotating shaft, the controller receives temperature detection information from a first temperature detection device, and when the temperature detection information of the first temperature detection device 3 is abnormal, the position of the bearing 1 at the location where the temperature detection information is abnormal is determined based on the speed of the rotating shaft and the moment when the temperature detection information is abnormal.
[0064] Optionally, the shaft system also includes a controller (not shown), which receives the temperature detection signal of the first temperature detection device 3 and is capable of receiving the feedback signal of the position positioning device 4. When the temperature of the first temperature detection device 3 is greater than the predetermined temperature, the position of the faulty bearing 1 is obtained according to the feedback signal.
[0065] Specifically, the shaft system also includes a timer (not shown) and a speed sensor (not shown). The timer can record the first moment t0 when the feedback signal occurs. When the temperature detection information is greater than the predetermined temperature threshold, the timer can record the second moment t1 of the current bearing temperature. The speed sensor is used to detect the speed of the rotating shaft 2. The controller determines the position of the bearing 1 at which the temperature detection information of the first temperature detection device 3 is greater than the predetermined temperature threshold based on the first moment t0 and the second moment t1 and the speed of the rotating shaft 2, but is not limited to this.
[0066] Specifically, the time Δt taken by the first temperature detection device 3 to move from the initial point to the position of the faulty bearing 1 is determined by the first moment t0 and the second moment t1, and then the position of the faulty bearing 1 is calculated based on the product of the rotation speed of the rotating shaft 2 and the time Δt, but not limited to this.
[0067] Continuing to refer to the accompanying drawings, one of the first temperature detection device 3 and the position positioning device 4 includes a signal generator, and the other includes a signal receiver that can match the signal generator. When the first temperature detection device 3 and the position positioning device 4 meet, the signal receiver outputs a feedback signal. In this embodiment, the first temperature detection device 3 and the position positioning device 4 meet and the position positioning device 4 can output a feedback signal to locate the first temperature detection device 3. At this time, the moment of the feedback signal can be recorded to record the initial moment of each rotation of the shaft 2. The position of the first temperature detection device 3 when the first temperature detection device 3 and the position positioning device 4 meet can be recorded as the initial position of the first temperature detection device 3.
[0068] With such arrangement, the initial position of the first temperature detection device 3 will be recorded every time the rotating shaft 2 rotates one circle. Thus, when the first temperature detection device 3 detects a faulty bearing 1, the position information of the faulty bearing 1 can be calculated within a single circle, thereby reducing the difficulty of calculation and further reducing the cost of the shaft system.
[0069] As an example, the first temperature detection device 3 includes an infrared temperature sensor, or a thermocouple sensor, or a thermistor sensor, or a nanothermistor sensor. This embodiment is described by taking a thermocouple sensor as an example, but is not limited thereto.
[0070] This embodiment takes the rotation speed of the rotating shaft 2 as 10 rpm as an example, but is not limited thereto. Specifically, the first temperature detection device 3 includes a K-type thermocouple, which is a temperature sensor with a high response speed. Its response speed can reach the ms level, which can adapt to the rotation speed of the rotating shaft 2 and improve the detection accuracy of the shaft system.
[0071] As required, there are multiple first temperature detection devices 3, and the multiple first temperature detection devices 3 are evenly arranged along the circumference of the rotating shaft 2. Figures 2 to 5 , an example is given in which four first temperature detection devices 3 are respectively arranged in the shaft system, but the invention is not limited thereto.
[0072] Reference Figure 1 and Figure 2The bearing seat 6 includes a radial bearing seat 61, and the bearing shell 1 includes a radial bearing shell 11. The radial bearing shell 11 can withstand the thrust along the radial direction of the rotating shaft 2. The radial bearing shell 11 is arranged on the outer peripheral side of the rotating shaft 2, and the first temperature detection device 3 extends radially inward from the outer peripheral wall of the rotating shaft 2, and the position positioning device 4 is embedded in the radial bearing shell 11. In this way, the first temperature detection device 3 is embedded in the rotating shaft 2, which avoids the first temperature detection device 3 and the radial bearing shell 11 from causing motion interference during the rotation of the rotating shaft 2 relative to the radial bearing shell 11. Furthermore, the position positioning device 4 is embedded in the radial bearing shell 11, which avoids the position positioning device 4 and the rotating shaft 2 from causing motion interference during the rotation of the rotating shaft 2 relative to the radial bearing shell 11.
[0073] In this embodiment, the position positioning device 4 is arranged radially outside the circumference of the first temperature detection device 3. When the first temperature detection device 3 and the position positioning device 4 meet, the position positioning device 4 is located radially outside the first temperature detection device 3 along the rotating shaft 2, but this is not limited to it.
[0074] The position positioning device 4 includes a second temperature detection device, which extends from the side wall of the bearing 1 facing the rotating shaft 2 toward the direction away from the bearing 1. When the first temperature detection device 3 meets the position positioning device 4, one of the position positioning device 4 and the first temperature detection device 3 outputs a feedback signal.
[0075] As an example, the first temperature detection device 3 can be a temperature sensor, which can emit signals of different bands while detecting the temperature of the bearing 1. In this way, by setting signals of different frequency bands through different first temperature detection devices 3, multiple first temperature detection devices 3 on the rotating shaft 2 can be distinguished.
[0076] Reference Figure 6 The first exemplary embodiment of the present disclosure provides a method for diagnosing a faulty bearing of a shaft system, which is applicable to the above shaft system. The method for diagnosing a faulty bearing of a shaft system comprises:
[0077] During the rotation of the shaft 2, the temperature detection information of each bearing 1 is obtained in real time.
[0078] When the temperature detection information is greater than a predetermined temperature threshold, the position of the bearing where the temperature detection information of the first temperature detection device is greater than the predetermined temperature threshold is determined according to the rotation speed of the shaft and the time when the temperature detection information is greater than the predetermined temperature threshold.
[0079] In an exemplary embodiment of the present disclosure, the shaft system further includes a position positioning device 4, which is used to detect the position information of the first temperature detection device 3 and output a feedback signal, wherein when the temperature detection information is greater than a predetermined temperature threshold, the position of the bearing 1 at the position where the temperature detection information of the first temperature detection device 3 is greater than the predetermined temperature threshold is determined according to the rotation speed of the shaft and the time when the temperature detection information is greater than the predetermined temperature threshold, including:
[0080] Acquire a feedback signal and a first time t0 when the feedback signal occurs;
[0081] When the temperature detection information is greater than a predetermined temperature threshold, the second time t1 when the current bearing temperature is obtained;
[0082] According to the first time t0 and the second time t1 and the rotation speed of the rotating shaft 2, it is determined that the position of the bearing 1 at which the temperature detection information of the first temperature detection device 3 is greater than the predetermined temperature threshold value.
[0083] Specifically, the time Δt taken by the first temperature detection device 3 to move from the initial point to the position of the faulty bearing 1 is determined by the first moment t0 and the second moment t1, and then the position of the faulty bearing 1 is calculated based on the rotation speed of the rotating shaft 2 and the product of the time Δt, but not limited to this.
[0084] Reference Figure 7 Another exemplary embodiment of the present disclosure provides a method for diagnosing a faulty bearing of a shaft system, which is applicable to the above shaft system. A plurality of first temperature detection devices 3 are numbered in a clockwise direction along the circumference of the rotating shaft 2. The method for diagnosing a faulty bearing of a shaft system includes:
[0085] Acquire the bearing temperatures detected by the plurality of first temperature detection devices 3 in real time;
[0086] When the bearing temperature detected by the first temperature detection device 3 numbered A is greater than the predetermined temperature threshold, the time is obtained and recorded as the third moment t3,
[0087] When the feedback signal of the first temperature detection device 3 numbered N is obtained, the time is obtained and recorded as the fourth moment t4,
[0088] The position of the first temperature detection device 3 numbered N at the third moment t3 is determined according to the third moment t3, the fourth moment t4 and the current rotation speed of the shaft 2. Specifically, the position of the first temperature detection device 3 numbered N at the third moment t3 can be calculated according to the product of the rotation speed of the shaft 2 and the time difference;
[0089] The position of the first temperature detection device 3 numbered A at the third moment t3 is determined based on the central angle between the first temperature detection device 3 numbered A and the first temperature detection device 3 numbered N and the radius length of the rotating shaft 2, thereby determining the position of the bearing 1 whose bearing temperature information is greater than a predetermined temperature threshold. Specifically, the position of the first temperature detection device 3 numbered A at the third moment t3 can be calculated based on the product of the central angle and the radius of the rotating shaft 2.
[0090] In another exemplary embodiment of the present disclosure, the first temperature detection device 3 numbered N is the first temperature detection device 3 that first meets the position positioning device 4 after the third time t3.
[0091] In this embodiment, the first temperature detection device 3 numbered N is the first temperature detection device 3 that meets the position positioning device 4 for the first time after the third moment t3. With such a configuration, it is determined that the position of the bearing 1 is located at a position where the temperature detection information of the first temperature detection device 3 is greater than the predetermined temperature threshold when the first temperature detection device 3 numbered A meets the position positioning device 4. The faulty bearing diagnosis method of the shaft system provided in this embodiment saves detection time, and because the time is recorded and updated in real time according to multiple temperature detection devices and position positioning devices, it can adapt to the working conditions of variable speed of the rotating shaft, thereby further improving the detection accuracy of the shaft system, but is not limited to this.
[0092] Another exemplary embodiment of the present disclosure, specifically, referring to Figure 2 For the convenience of description, the first temperature detection device 3 can be numbered and located at Figure 2 The first temperature detection device 3 at the 12 o'clock position may be No. 1, and the other three first temperature detection devices 3 may be numbered 2, 3, and 4 in the clockwise direction. The rotating shaft 2 rotates counterclockwise.
[0093] When the temperature of the bearing bush 1 at the 1 o'clock direction of the rotating shaft 2 is abnormal, as an example, when the temperature of the bearing bush 1 is abnormal, the temperature detection information of the first temperature detection device 3 is greater than the predetermined temperature threshold, we can locate it through the following logic:
[0094] The layout of the first temperature detection devices 3 No. 1, 2, 3, and 4 is 90 degrees different from each other in the circumferential direction of the rotating shaft 2. When the controller feedback temperature is abnormal, the following situation will occur:
[0095] Before the No. 3 first temperature detection device 3 and the position positioning device 4 meet, the temperature of the No. 1 first temperature detection device 3 is already abnormal;
[0096] Before the No. 2 first temperature detection device 3 and the position positioning device 4 meet, the temperature of the No. 4 first temperature detection device 3 is also abnormal;
[0097] At this time, it can be determined that the bearing 1 with abnormal temperature is on the right half of the rotating shaft 2.
[0098] 0.5s before the first temperature detection device 3 No. 3 meets the position positioning device 4, the temperature of the first temperature detection device 3 No. 1 becomes abnormal; 0.5s before the first temperature detection device 3 No. 2 meets the position positioning device 4, the temperature of the first temperature detection device 3 No. 4 becomes abnormal; it can be located that the bearing 1 with abnormal temperature is on the right half of the rotating shaft 2.
[0099] The above-mentioned method for diagnosing faulty bearings of a shaft system is described by taking the shaft system including four first temperature detection devices 3 as an example, but is not limited to this. The method for diagnosing faulty bearings of a shaft system is also applicable to a shaft system including multiple first temperature detection devices 3.
[0100] In order to further determine the position of the bearing, the following operations can be performed:
[0101] Specifically, refer to Figure 2 For the convenience of description, the first temperature detection device 3 can be numbered and located at Figure 2 The first temperature detection device 3 at the 12 o'clock position may be No. 1, and the other three first temperature detection devices 3 may be numbered 2, 3 and 4 in the clockwise direction, and the rotating shaft 2 rotates counterclockwise.
[0102] When the temperature of the bearing bush 1 at the 1 o'clock direction of the rotating shaft 2 is abnormal, as an example, when the temperature of the bearing bush 1 is abnormal, the temperature detection information of the first temperature detection device 3 is greater than the predetermined temperature threshold, we can locate it through the following logic:
[0103] The layout of the first temperature detection devices 3 No. 1, 2, 3, and 4 is 90 degrees different from each other in the circumferential direction of the rotating shaft 2. When the controller feedback temperature is abnormal, the following situation will occur:
[0104] When the temperature of the first temperature detection device 3 No. 1 is abnormal, the third time t3 is recorded. For example but not limited to, in this embodiment, when the temperature of the first temperature detection device 3 is abnormal, it can be when the temperature detection information of the first temperature detection device 3 is greater than a predetermined temperature threshold, but not limited to this.
[0105] When the first temperature detection device 3 No. 2 and the position positioning device 4 meet, the fourth moment t4 is recorded;
[0106] According to the time difference between the third moment t3 and the fourth moment t4 and the speed of the rotating shaft 2, the position of the No. 2 first temperature detection device 3 at the third moment t3 can be determined.
[0107] According to the central angle α between the first temperature detection device No. 1 3 and the first temperature detection device No. 2 3 and the radius r of the rotating shaft 2, the position of the first temperature detection device No. 1 3 at the third moment t3 is determined, thereby determining the position of the bearing 1 with abnormal temperature detected by the first temperature detection device No. 1 3.
[0108] In this embodiment, the No. 2 first temperature detection device 3 is the first temperature detection device 3 that first encounters the position positioning device 4 after the third time t3.
[0109] Different from the above embodiment, the bearing bush 1 in this embodiment includes a thrust bearing bush 12. Figure 3 and Figure 4 The bearing seat 6 includes a thrust bearing seat 62, and the bearing bush 1 includes a thrust bearing bush 12. The thrust bearing bush 12 can withstand the axial force along the axial direction of the rotating shaft 2. The shaft system includes a thrust plate 5, which protrudes and extends radially from the outer peripheral surface of the rotating shaft 2. The thrust bearing bush 12 is arranged on one side of the thrust plate 5 along the axial direction of the rotating shaft 2. The position positioning device 4 is embedded in the thrust bearing bush 12. The first temperature detection device 3 extends from the axial end surface of the thrust plate 5 toward the direction away from the thrust bearing bush 12.
[0110] In this embodiment, the position positioning device 4 is located on the circumference corresponding to the axial direction of the circumference where the first temperature detection device 3 is located. When the position positioning device 4 and the first temperature detection device 3 meet, the position positioning device 4 and the first temperature detection device 3 are relatively arranged along the axial direction of the rotating shaft 2.
[0111] In this embodiment, the thrust bearing seats 62 are respectively provided on both sides of the thrust plate 5 as an example for description, but the present invention is not limited thereto. As required, the thrust bearing seat 62 may be provided on one side of the thrust plate 5, while the thrust bearing seat 62 is not provided on the other side of the thrust plate 5, but the present invention is not limited thereto.
[0112] Different from the above embodiment, Figure 5 In this embodiment, the shaft system includes a radial bearing 11 and a thrust bearing 12. Specifically, two radial bearing seats 61 are arranged at intervals along the axial direction of the rotating shaft 2. Each radial bearing seat 61 is provided with a mounting hole for the rotating shaft 2 to pass through. The rotating shaft 2 is rotatably arranged in the mounting hole. A plurality of radial bearings 11 are arranged between the rotating shaft 2 and the radial bearing seats 61. The plurality of radial bearings 11 are arranged at intervals along the circumference of the rotating shaft 2.
[0113] The outer peripheral wall of the rotating shaft 2 is provided with a thrust plate 5 protruding outward, and the thrust plate 5 is arranged between two radial bearing seats 61 along the axial direction of the rotating shaft 2, and the thrust plate 5 is arranged at intervals from the two radial bearing seats 61. Thrust bearing seats 62 are respectively arranged on both sides of the thrust plate 5 along the axial direction of the rotating shaft 2, and the thrust bearing seats 62 are provided with mounting holes for the rotating shaft 2 to pass through, and the rotating shaft 2 is rotatably arranged in the mounting holes, and the thrust bearing bushes 12 are arranged on both sides of the thrust plate 5 along the axial direction of the rotating shaft 2 and between the thrust plate 5 and the thrust bearing seats 62.
[0114] It should be noted that the above-mentioned faulty bearing diagnosis method is not only applicable to the determination of radial bearings with abnormal temperature, but also to the determination of thrust bearings with abnormal temperature; the above-mentioned controller can be used for the above-mentioned fault diagnosis method, and the controller can be an independent controller or a part integrated into the main control of the wind turbine generator set.
[0115] In another aspect of the present disclosure, a wind turbine generator set is provided, the wind turbine generator set comprising the shaft system as described above, but not limited thereto. Optionally, in this embodiment, the rotating shaft 2 comprises a main shaft, one end of the main shaft is connected to the hub of the impeller, and the other end is connected to the rotor of the generator, so as to drive the generator to generate electricity through the rotation of the impeller.
[0116] In the description of the present disclosure, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations 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 should not be understood as a limitation on the present disclosure.
[0117] 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.
[0118] 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, it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be 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 the present disclosure can be understood according to specific circumstances.
[0119] 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
1. A shaft system, characterized in that: The shaft system comprises: Axis (2), A bearing seat (6) is provided with a mounting hole for the rotating shaft (2) to pass through, and the rotating shaft (2) is rotatably arranged in the mounting hole; A plurality of bearing shells (1) are arranged at intervals along the circumference of the rotating shaft (2) between the bearing seat (6) and the rotating shaft (2). A first temperature detection device (3) is arranged on the rotating shaft (2) and is aligned with the circular ring where the bearing (1) is located. The first temperature detection device (3) can detect the temperature of the bearing (1) to determine the position of the bearing (1) with abnormal temperature.
2. The shaft system according to claim 1, characterized in that: The shaft system also includes a position positioning device (4), which is arranged on the bearing seat (6) or on one of the multiple bearing shells (1) and is used to detect the position information of the first temperature detection device (3) and output a feedback signal.
3. The shaft system according to claim 2, characterized in that: One of the first temperature detection device (3) and the position positioning device (4) includes a signal generator, and the other includes a signal receiver that can match the signal generator. When the first temperature detection device (3) and the position positioning device (4) meet, the signal receiver outputs the feedback signal.
4. The shaft system according to claim 2, characterized in that: There are a plurality of the first temperature detection devices (3), and the plurality of the first temperature detection devices (3) are evenly arranged along the circumference of the rotating shaft (2).
5. The shaft system according to claim 1, characterized in that: The first temperature detection device (3) comprises an infrared temperature sensor, or a thermocouple sensor, or a thermistor sensor, or a nanothermistor sensor.
6. The shaft system according to claim 3, characterized in that: The bearing seat (6) includes a radial bearing seat (61), the bearing shell (1) includes a radial bearing shell (11), the radial bearing shell (11) is arranged on the outer peripheral side of the rotating shaft (2), the first temperature detection device (3) extends radially inward from the outer peripheral wall of the rotating shaft (2) along the radial direction of the rotating shaft (2), and the positioning device (4) is embedded in the radial bearing shell (11).
7. The shaft system according to claim 3, characterized in that: The bearing seat (6) includes a thrust bearing seat (62), the bearing shell (1) includes a thrust bearing shell (12), the shaft system includes a thrust plate (5), the thrust plate (5) radially protrudes and extends from the outer peripheral surface of the rotating shaft (2), the thrust bearing shell (12) is arranged on the axial side of the thrust plate (5) along the rotating shaft (2), the positioning device (4) is embedded in the thrust bearing shell (12), and the first temperature detection device (3) extends from the axial end surface of the thrust plate (5) in a direction away from the thrust bearing shell (12).
8. The shaft system according to claim 1, characterized in that: The shaft system also includes a rotation speed sensor and a controller, wherein the rotation speed sensor is used to detect the rotation speed of the rotating shaft (2), and the controller receives temperature detection information from the first temperature detection device (3). When the temperature detection information of the first temperature detection device (3) is abnormal, the position of the bearing (1) at the location where the temperature detection information is abnormal is determined based on the rotation speed of the rotating shaft and the time when the temperature detection information is abnormal.
9. The shaft system according to claim 2, characterized in that: The position positioning device (4) includes a second temperature detection device, and the position positioning device (4) extends from the side wall of the bearing (1) toward the rotating shaft (2) in a direction away from the bearing (1). When the first temperature detection device (3) meets the position positioning device (4), one of the position positioning device (4) and the first temperature detection device (3) outputs the feedback signal.
10. The shaft system according to claim 2, characterized in that: The shaft system also includes a timer and a speed sensor. The timer can record the first moment t0 when the feedback signal occurs. When the temperature detection information is abnormal, the timer can record the second moment t1 of the current bearing temperature. The speed sensor is used to detect the speed of the rotating shaft (2). The position of the bearing (1) at the location where the temperature detection information is abnormal is determined based on the first moment t0, the second moment t1 and the speed of the rotating shaft (2).
11. The shaft system according to claim 4, characterized in that: The plurality of first temperature detection devices (3) are numbered in a clockwise order along the circumference of the rotating shaft (2); the shaft system further comprises a rotation speed sensor and a controller; the rotation speed sensor is used to detect the rotation speed of the rotating shaft (2); the controller receives temperature detection information of the first temperature detection device (3); When the temperature detection information of the first temperature detection device (3) numbered A is abnormal, the recording time is the third moment t3, When the first temperature detection device (3) numbered N outputs a feedback signal, the time is recorded as the fourth moment t4 and the current rotation speed of the current shaft is recorded, Determining the position of the first temperature detection device (3) numbered N at the third moment t3 according to the third moment t3, the fourth moment t4 and the current rotation speed of the rotating shaft (2); The position of the first temperature detection device (3) numbered A at the third moment t3 is determined based on the central angle between the first temperature detection device (3) numbered A and the first temperature detection device (3) numbered N and the radius length of the rotating shaft (2), thereby determining the position of the bearing (1) at the location where the temperature detection information is abnormal.
12. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a tower, an impeller rotatably connected to the tower, a generator and a shaft system as described in any one of claims 1 to 11, wherein the shaft system is arranged between the impeller and the generator, and the two ends of the rotating shaft (2) are respectively connected to the rotor of the generator and the impeller.
13. A method for diagnosing faulty bearings of a shaft system, characterized in that: The shaft system according to any one of claims 1 is applicable, wherein the method for diagnosing a faulty bearing of the shaft system comprises: During the rotation of the rotating shaft (2), the temperature detection information of each bearing bush (1) is obtained in real time. When the temperature detection information is abnormal, the position of the bearing (1) at the location where the temperature detection information is abnormal is determined according to the rotation speed of the rotating shaft and the time when the temperature detection information is abnormal.
14. The method for diagnosing a faulty bearing of a shaft system according to claim 13, characterized in that: The shaft system comprises a position positioning device (4) for detecting position information of the first temperature detection device (3) and outputting a feedback signal, wherein when the temperature detection information is abnormal, determining the position of the bearing (1) at the location where the temperature detection information is abnormal according to the rotation speed of the shaft and the time when the temperature detection information is abnormal comprises: Acquire the feedback signal and the first time t0 when the feedback signal occurs; When the temperature detection information is abnormal, obtaining a second time t1 when the current temperature is abnormal; The position of the bearing (1) where the temperature detection information of the first temperature detection device (3) is abnormal is determined based on the first moment t0 and the second moment t1 and the rotation speed of the rotating shaft (2).
15. A method for diagnosing faulty bearings of a shaft system, characterized in that: The shaft system according to claim 4 is applicable, wherein the plurality of first temperature detection devices (3) are numbered in clockwise order along the circumference of the rotating shaft (2), and the method for diagnosing a faulty bearing of the shaft system comprises: Acquiring in real time the bearing temperatures detected by the plurality of first temperature detection devices (3); When the bearing temperature information detected by the first temperature detection device (3) numbered A is abnormal, the time is obtained and recorded as a third moment t3, When the feedback signal of the first temperature detection device (3) numbered N is obtained, the time is obtained and recorded as the fourth moment t4, Determining the position of the first temperature detection device (3) numbered N at the third moment t3 according to the third moment t3, the fourth moment t4 and the current rotation speed of the rotating shaft (2); The position of the first temperature detection device (3) numbered A at the third moment t3 is determined based on the central angle between the first temperature detection device (3) numbered A and the first temperature detection device (3) numbered N and the radius length of the rotating shaft (2), thereby determining the position of the bearing (1) at the location where the temperature information is abnormal.