A kind of on-line wind turbine generator main shaft bearing stop ring and anti-movement method

Abstract

A backstop ring and anti-movement method for the main shaft bearing of an online wind turbine generator set, the main shaft installation structure of the wind turbine generator set is a double bearing installation, the main shaft front bearing is a floating bearing installation method, the main shaft rear bearing is a backstop bearing installation method, the backstop ring is installed in the bearing seat at the rear end of the main shaft front bearing, the backstop ring includes a backstop ring 1 and a backstop ring 2, the backstop ring 1 includes a stainless steel bar 1, a stainless steel column and a male clamp head steel column, the backstop ring 2 includes a stainless steel bar 2, a stainless steel column and a female clamp head steel column, the stainless steel bar 1 and the stainless steel bar 2 are the same semicircle, the two ends of the stainless steel bar 1 are respectively fixed with a male clamp head steel column, and a plurality of stainless steel columns are fixedly and evenly arranged on the stainless steel bar 1 between the male clamp head steel columns at the two ends. The present invention can completely solve the problems of the main shaft front bearing and the main shaft back movement and bearing wear and damage; and can reduce the workload of personnel.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a main shaft bearing stop ring of an online wind power generator set and an anti-movement method. Background Art

[0002] The transmission system of a doubly-fed wind turbine generator set is composed of an impeller system, a main shaft system, and a gearbox system. The main shaft system is composed of a main shaft and a bearing. When the wind turbine generator set is running, the transmission system starts to work. The impeller drives the main shaft to rotate and gives the main shaft an axial thrust. This thrust normally acts on the bearing. However, most wind turbine main shaft bearings are currently installed in a floating bearing installation method. The bearings installed in this way cannot withstand the thrust of the main shaft when the wind turbine is running, causing the bearing to move backward, which eventually leads to serious wear or even damage to the bearing. The design principle of the "stop ring" is equivalent to changing the installation method of the bearing (from a floating installation method to a stop installation method), adding a "stop ring" between the bearing and the bearing seat end cover, and using the reaction force of the "stop ring" and the bearing seat end cover to prevent the bearing from moving backward, thereby avoiding bearing wear or damage. For example: nylon integral retaining ring; baffles are installed on both sides of the gearbox elastic support.

[0003] The main shaft installation structure of the wind turbine generator set is a double bearing installation, in which the front bearing is close to the hub side and is designed as a floating bearing installation structure, that is, there is no obstruction between the bearing seat and the outer retaining ring of the bearing, and the rear bearing is close to the gearbox side and is designed as a stop bearing installation structure. During the operation of the wind turbine, the impeller receives wind energy, which will cause the main shaft transmission chain to be subjected to an axial thrust. If the front bearing of the main shaft is a stop structure, the bearing can withstand the thrust of the impeller and the transmission chain will not move backward. However, the current on-site situation is that the front bearing of the main shaft is a floating bearing installation method, and the rear bearing of the main shaft is a stop bearing installation method. When the wind turbine is running, the axial thrust of the impeller causes the front bearing of the main shaft and the main shaft to move at the same time, and the axial force is applied to the rear bearing of the main shaft. Due to the obstruction of the outer ring of the rear bearing, the inner ring and roller of the rear bearing move backward. The rear bearing runs in an offset state for a long time, which will cause the bearing cage, rollers and inner and outer rings of the bearing to wear, the bearing temperature rises, and eventually the bearing is damaged.

[0004] Currently, nylon integral retaining rings are used: on the one hand, due to the bearing capacity problem of nylon materials, this type of retaining ring requires a wider nylon retaining ring to meet the bearing capacity requirements, which occupies a large space and will reduce the oil storage capacity of the oil chamber in the bearing seat, affecting the lubrication effect; on the other hand, the wider nylon retaining ring will block the oil drain port on the end cover, and the waste grease in the bearing cannot be removed in time, affecting the quality of the oil. Over a long period of time, it will cause grease deterioration and affect the service life of the bearing. In addition, personnel are required to manually disassemble and assemble the end cover to drain the oil regularly, which increases the workload of personnel.

[0005] Install baffles on both sides of the elastic support of the gearbox: This method is to install baffles between the support arms on both sides of the gearbox and the elastic support seat, and use the hollow shaft at the input end of the gearbox to exert reaction force on the main shaft to prevent the bearing from moving backward. Under normal circumstances, the gearbox only accepts the steering force of the main shaft and is not affected by the axial thrust of the main shaft. This method will give a large thrust to the driving support arm of the gearbox. Running in this state for a long time can easily cause damage to the gearbox. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention aims to provide a main shaft bearing retaining ring of an online wind turbine generator set and a method for preventing movement.

[0007] The present invention adopts the following technical scheme:

[0008] The invention discloses a retaining ring for the main shaft bearing of an online wind turbine generator set and a method for preventing movement. The main shaft mounting structure of the wind turbine generator set is a double-bearing mounting structure. The front main shaft bearing is a floating bearing mounting structure, and the rear main shaft bearing is a retaining bearing mounting structure. The retaining ring is installed in the bearing seat at the rear end of the front main shaft bearing.

[0009] The backstop ring comprises a first backstop ring and a second backstop ring.

[0010] The backstop ring 1 includes a stainless steel bar 1, a stainless steel column and a male clamp head steel column.

[0011] The second retaining ring comprises a second stainless steel bar, a stainless steel column and a female clamp steel column.

[0012] The stainless steel bars 1 and 2 have the same shape, both being semicircular.

[0013] The two ends of the stainless steel bar 1 are respectively fixedly provided with male clamp head steel columns. A plurality of stainless steel columns are evenly fixedly provided on the stainless steel bar 1 between the male clamp head steel columns at the two ends.

[0014] The two ends of the stainless steel bar 2 are respectively fixedly provided with female clamp steel columns. A plurality of stainless steel columns are evenly fixedly provided on the stainless steel bar 2 between the female clamp steel columns at the two ends.

[0015] The male clamp head steel column and the female clamp head steel column are matched in a male and female head anti-disconnection form.

[0016] Furthermore, the male clamp head steel column is provided with a clamping platform, and the clamping platform is provided with a semicircular clamp head. The female clamp head steel column is provided with a semicircular clamping groove, and the outer side of the semicircular clamping groove is provided with a clamping platform positioning groove.

[0017] The size and shape of the semicircular slot is consistent with the cross-sectional size and shape of the semicircular clamp head, and the semicircular clamp head can be tightly buckled in the semicircular slot. The size and shape of the card platform positioning groove is consistent with the cross-sectional size and shape of the card platform, and the card platform can be tightly buckled in the card platform positioning groove.

[0018] Furthermore, the stainless steel bar 1 and the stainless steel bar 2 are stainless steel bars with a thickness of six millimeters.

[0019] Furthermore, the stainless steel column is a stainless steel column with a diameter of 24 mm and a height of 31 mm.

[0020] Furthermore, the male clamp head steel column and the female clamp head steel column are processed from stainless steel columns with a diameter of 24 mm and a height of 31 mm.

[0021] Further, the steps of using the main shaft bearing stop ring of the online wind turbine generator set to prevent the main shaft from moving are:

[0022] 1) Hand brake;

[0023] 2) Remove the outer seal rings on the front and rear bearing gearbox sides of the main shaft;

[0024] 3) Check and measure the axial misalignment between the bearing retaining ring and the bearing end cover. If the misalignment is greater than 1.5, it means that the bearing has back-moving;

[0025] 4) Use a wrench to remove the gearbox side end covers of the front and rear bearings of the main shaft;

[0026] 5) Use a wrench to loosen the elastic supports of the two torque arms of the gearbox;

[0027] 6) Use two jacks to root the two sides between the main shaft front bearing and the wheel hub disc, push the main shaft disc from the front to move the main shaft forward, and reset the main shaft bearing to its normal position in the raceway;

[0028] 7) Install the bearing retaining ring;

[0029] 8) Install the front and rear bearing end covers of the main shaft;

[0030] 9) Tighten the elastic support of the gear box;

[0031] 10) Remove the jack.

[0032] 11) Release the brake to allow the impeller to rotate freely and check whether there is any abnormal sound in the bearing. If there is no abnormal sound, the installation is complete.

[0033] The beneficial effects of the present invention are:

[0034] 1. It can prevent the main shaft front bearing and the main shaft from running backward; it can completely solve the main shaft running backward and bearing wear and damage problems caused by the floating installation of bearings in online wind turbines;

[0035] 2. The retaining ring is designed to be split in half and can be installed without disassembling the main shaft;

[0036] 3. It can be installed without modifying the bearing seat;

[0037] 4. The point-shaped segmented structure is adopted, which will not block the oil drain port of the bearing end cover after installation, ensuring the normal drainage of waste grease; avoiding the blockage of the oil drain port due to the installation of a retaining ring, which will affect the service life of the bearing;

[0038] 5. The space occupied by the oil chamber is small, avoiding the problem of reducing the oil storage space of the bearing seat oil chamber due to the installation of a retaining ring; ensuring that there is sufficient oil in the oil chamber of the bearing seat.

[0039] 6. Reduce staff workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Installation position diagram of the retaining ring

[0041] Figure 2 This is a schematic diagram of the structure of the backstop ring;

[0042] Figure 3 A schematic diagram of the structure of a backstop ring;

[0043] Figure 4 This is a schematic diagram of the structure of the second backstop ring;

[0044] Figure 5 This is a side view of the backstop ring;

[0045] Figure 6 This is the second side view of the backstop ring;

[0046] Figure 7 This is a schematic diagram of the male clamp head steel column structure;

[0047] Figure 8 This is a schematic diagram of the steel column structure of the female clamp.

[0048] Figure markings: A is the installation position of the backstop ring, 1-backstop ring one, 2-backstop ring two, 3-stainless steel rebar, 4-stainless steel column, 5-male clamp steel column, 6-female clamp steel column, 7-semicircular clamp, 8-cage, 9-semicircular slot, 10-cage positioning slot. DETAILED DESCRIPTION

[0049] For ease of understanding, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and through embodiments:

[0050] like Figure 1-Figure 8 As shown, an online wind turbine main shaft bearing retaining ring and anti-movement method, the wind turbine main shaft mounting structure is a double bearing installation, the main shaft front bearing is a floating bearing installation method, the main shaft rear bearing is a retaining bearing installation method, and the retaining ring is installed in the bearing seat at the rear end of the main shaft front bearing.

[0051] A backstop ring for a main shaft bearing of an online wind turbine generator set comprises a backstop ring 1 and a backstop ring 2.

[0052] The backstop ring 1 includes a stainless steel bar 3, a stainless steel column 4 and a male clamp steel column 5.

[0053] The stainless steel bar 3 is a stainless steel bar with a thickness of six millimeters and is semicircular.

[0054] Male clamp steel columns 5 are fixedly provided at both ends of the stainless steel bar 3 .

[0055] Three stainless steel columns 4 are fixedly and evenly arranged between two male clamp head steel columns 5 on the stainless steel bar 3.

[0056] The stainless steel column 4 is a stainless steel column with a diameter of 24 mm and a height of 31 mm.

[0057] The male clamp head steel column 5 is processed from a stainless steel column with a diameter of 24 mm and a height of 31 mm.

[0058] A clamping platform 8 is arranged on the male clamping head steel column 5 , and a semicircular clamping head 7 is arranged on the clamping platform 8 .

[0059] The backstop ring 2 includes a stainless steel bar 3, a stainless steel column 4 and a female clamp steel column 6.

[0060] Female clamp steel columns 6 are fixedly provided at both ends of the stainless steel bar 3 .

[0061] Three stainless steel columns 4 are fixedly and evenly arranged between the two female clamp steel columns 6 on the stainless steel bar 3.

[0062] The female chuck steel column 6 is made of a stainless steel column with a diameter of 24 mm and a height of 31 mm.

[0063] A semicircular clamping groove 9 is arranged on the female clamping head steel column 6 , and a clamping platform positioning groove 10 is arranged outside the semicircular clamping groove 9 .

[0064] The size and shape of the semicircular clamping groove 9 are consistent with the cross-sectional size and shape of the semicircular clamping head 7 , and the semicircular clamping head 7 can be tightly buckled in the semicircular clamping groove 9 .

[0065] The size and shape of the card platform positioning groove 10 are consistent with the cross-sectional size and shape of the card platform 8 , and the card platform 8 can be tightly buckled in the card platform positioning groove 10 .

[0066] After the retaining ring 1 and the retaining ring 2 are connected into one body, the male clamp steel columns 5 at both ends are respectively buckled into the corresponding female clamp steel columns 6, and the retaining ring 1 and the retaining ring 2 are connected into a circle with an outer diameter of 899 mm and an inner diameter of 850 mm. It is composed of eight stainless steel cylinders with a diameter of 24 mm and a height of 31 mm and a 6 mm stainless steel bar. It belongs to a point-shaped uniform distribution load-bearing mode, ensuring that the retaining ring will not fall off when installed in the bearing seat. It avoids the shortcomings of the integral retaining ring, such as large space occupation and blocking the oil drain port; it adopts a half-split form, which can be directly installed on the wind turbine generator set without disassembling and assembling large components such as the main shaft; the male and female anti-disconnection form design is adopted at the "retaining ring" interface to avoid movement and falling off during operation.

[0067] The steps of the main shaft bearing stop ring of the online wind power generator set of the present invention for preventing the main shaft from moving are as follows:

[0068] 1) Hand brake;

[0069] 2) Remove the outer seal rings on the front and rear bearing gearbox sides of the main shaft;

[0070] 3) Check and measure the axial misalignment between the bearing retaining ring and the bearing end cover. If the misalignment is greater than 1.5, it means that the bearing has back-moving;

[0071] 4) Use a wrench to remove the gearbox side end covers of the front and rear bearings of the main shaft;

[0072] 5) Use a wrench to loosen the elastic supports of the two torque arms of the gearbox;

[0073] 6) Use two jacks to root the two sides between the main shaft front bearing and the wheel hub disc, push the main shaft disc from the front to move the main shaft forward, and reset the main shaft bearing to the normal position in the raceway;

[0074] 7) Install the bearing retaining ring;

[0075] 8) Install the front and rear bearing end covers of the main shaft;

[0076] 9) Tighten the elastic support of the gear box;

[0077] 10) Remove the jack.

[0078] 11) Release the brake to allow the impeller to rotate freely and check whether there is any abnormal sound in the bearing. If there is no abnormal sound, the installation is complete.

[0079] The above embodiments are merely examples or explanations of the technical solutions of the present invention and should not be construed as limiting the technical solutions of the present invention. Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also includes these modifications and variations.

Claims

1. A method for preventing the main shaft bearing of an online wind turbine generator set from moving. The main shaft mounting structure of the wind turbine generator set is a double-bearing mounting structure. The front bearing of the main shaft is a floating bearing mounting structure. The rear bearing of the main shaft is a stop bearing mounting structure. A stop ring is installed in the bearing seat at the rear end of the front bearing of the main shaft. The stop ring includes a stop ring 1 and a stop ring 2. The stop ring 1 includes a stainless steel bar 1, a stainless steel column and a male clamp head steel column. The stop ring 2 includes a stainless steel bar 2, a stainless steel column and a female clamp head steel column. The stainless steel bar 1 and the stainless steel bar 2 have the same shape and are both semicircular. Male clamp head steel columns are fixedly arranged at both ends of the stainless steel bar 1. A plurality of stainless steel columns are fixedly and evenly arranged on the stainless steel bar 1 between the male clamp head steel columns at both ends. Female clamp head steel columns are fixedly and evenly arranged on the stainless steel bar 2 between the female clamp head steel columns at both ends. It is characterized in that The steps for preventing the main shaft from moving are as follows: 1) Manual brake; 2) Remove the outer seal rings on the gearbox side of the front and rear bearings of the main shaft; 3) Check and measure the axial misalignment between the bearing retaining ring and the bearing end cover. If the misalignment is greater than 1.5, it means that the bearing has backlash; 4) Use a wrench to remove the gearbox side end covers of the front and rear bearings of the main shaft; 5) Use a wrench to loosen the elastic supports of the two torque arms of the gearbox; 6) Use two jacks to root the two sides between the main shaft front bearing and the wheel hub disc, push the main shaft disc from the front to move the main shaft forward, and reset the main shaft bearing to its normal position in the raceway; 7) Install the bearing retaining ring; 8) Install the front and rear bearing end covers of the main shaft; 9) Tighten the elastic support of the gearbox; 10) Remove the jack; 11) Release the brake to allow the impeller to rotate freely and check whether there is any abnormal sound in the bearing. If there is no abnormal sound, the installation is complete.

2. The method for preventing the main shaft bearing of an online wind turbine generator set from moving according to claim 1 is characterized in that: The male clamp head steel column is provided with a clamping platform, the clamping platform is provided with a semicircular clamp head, the female clamp head steel column is provided with a semicircular clamping groove, and the outer side of the semicircular clamping groove is provided with a clamping platform positioning groove.

3. The method for preventing the main shaft bearing of an online wind turbine generator set from moving in accordance with claim 2 is characterized in that: The stainless steel bar 1 and the stainless steel bar 2 are stainless steel bars with a thickness of six millimeters.

4. The method for preventing the main shaft bearing of an online wind turbine generator set from moving in accordance with claim 3 is characterized in that: The stainless steel column has a diameter of 24 mm and a height of 31 mm.

Images