Vertical hydroelectric generator set bearing system simulation test device and test method thereof

Abstract

The application discloses a vertical water turbine generator set bearing system simulation test device and a test method thereof, which comprises a rack, a first bearing set, a second bearing set, a third bearing set, a driver, a main shaft and a rotor. The rack is sequentially provided with a first platform, a second platform, a third platform and a fourth platform from top to bottom. The first bearing set is installed on the first platform, the second bearing set is installed on the second platform, the third bearing set is installed on the third platform, and the driver is installed on the fourth platform. The main shaft is longitudinally installed on the first bearing set, the second bearing set and the third bearing set, and the main shaft is butt-jointed with an output shaft of the driver. The application monitors the state of the vertical water turbine generator set bearing system simulation test device under different faults, thereby analyzing the water turbine generator set bearing system fault under actual conditions, and providing data support for the research and prediction of the vertical water turbine generator set bearing system fault.

Description

Technical Field

[0001] This invention relates to the field of simulation testing technology for vertical hydro-generators, and in particular to a simulation testing device and testing method for the bearing system of a vertical hydro-generator set. Background Technology

[0002] Vertical turbine generators are important hydroelectric equipment and an indispensable component of the hydropower industry. They are crucial for fully utilizing clean and renewable energy to achieve energy conservation, emission reduction, and environmental pollution reduction. Vertical turbine generators are compact in structure, highly efficient, and can adapt to a wide range of heads, making them one of the most widely used turbine types worldwide. Therefore, research and prediction of bearing system failures in vertical turbine generators are of great significance for turbine design and routine maintenance.

[0003] Chinese patent document CN107219040A discloses a dynamic balancing device for simulating a vertical hydro-generator unit. The device includes a main cabinet, a drive motor connected to the main cabinet at its top, a coupling connected to a main shaft, an upper bearing at one end of the main shaft, a lower balance wheel at the other end, and the upper balance wheel and lower bearing sequentially arranged in the middle of the main shaft. Its advantage is that it can simulate and control vibration balancing by installing balance weights on the balance wheels and adjusting their mass and position. Its disadvantage is that this device is mainly used to simulate the dynamic balancing of the rotor of a vertical hydro-generator unit and does not address the simulation of bearing system failures in vertical hydro-generator units. Summary of the Invention

[0004] To address the existing technical problems, the main objective of this invention is to provide a simulation test device and method for the bearing system of a vertical hydro-generator unit. By simulating different bearing system fault states, these faults can be reproduced more realistically. By monitoring the state of the simulation test device for the bearing system of the vertical hydro-generator unit under different faults, including shaft runout, vibration, acceleration, oil temperature, and noise, the device can be used to analyze the bearing system faults of the hydro-generator unit under actual conditions, providing data support for the research and prediction of bearing system faults of vertical hydro-generator units.

[0005] The technical solution adopted in this invention is: a simulation test device for a bearing system of a vertical hydro-generator set, comprising a frame, a first bearing assembly, a second bearing assembly, a third bearing assembly, a driver, a main shaft, and a rotor. The frame is provided with a first platform, a second platform, a third platform, and a fourth platform from top to bottom. The first bearing assembly is installed on the first platform, the second bearing assembly is installed on the second platform, the third bearing assembly is installed on the third platform, and the driver is installed on the fourth platform. The main shaft is longitudinally installed on the first bearing assembly, the second bearing assembly, and the third bearing assembly, and the main shaft is movably and adjustablely connected to the output shaft of the driver.

[0006] Both the first bearing assembly and the third bearing assembly include a first bearing housing, a first bearing bush, and a first adjustment device. The two first bearing housings are respectively mounted on the first platform and the third platform. Multiple first bearing bushes are radially slidably mounted inside the first bearing housing around the main shaft. A first adjustment device is installed on the first bearing housing at the position corresponding to each first bearing bush. The first adjustment device is used to adjust the gap between the first bearing bush and the main shaft. A first displacement sensor for detecting the position of the first bearing bush is also installed on the first bearing housing.

[0007] The main shaft has a first annular cavity with an open lower side at the first bearing group and the third bearing group, respectively. A first oil baffle ring is installed in the inner hole of the first bearing seat. The first oil baffle ring extends upward into the first annular cavity, and a first oil cavity is formed between the first bearing seat and the first oil baffle ring. The first bearing bush surrounds the outer wall of the main shaft, and the outer surface of the first oil baffle ring is provided with a reverse spiral groove.

[0008] A first upper cover is installed on the first bearing housing, and a first oil inlet pipe and a first oil return pipe are installed on the first upper cover. The depth to which the first oil inlet pipe and the first oil return pipe are inserted into the first oil chamber is adjustable, and the installation positions of the first oil inlet pipe and the first oil return pipe on the first upper cover can be interchanged and adjusted.

[0009] A first temperature sensor is installed on the first bearing bush, and a second temperature sensor is installed on the first bearing housing. The second temperature sensor extends into the first oil chamber.

[0010] The second bearing assembly includes a second bearing housing, an annular bearing, a thrust bearing, a friction ring, second bearing bushes, and a second adjustment device. The second bearing housing is mounted on a second platform, and the annular bearing is mounted on the bottom of the second bearing housing. Multiple mounting grooves are provided on the upper side of the annular bearing surrounding the main shaft, and thrust bearings are installed in the mounting grooves. A flange is provided on the outer wall of the main shaft, and a friction ring is installed on the lower side of the flange, supporting the thrust bearing. A height adjustment screw is threaded onto the annular bearing at the position corresponding to the thrust bearing, and the height adjustment screw is supported on the lower side of the thrust bearing. Multiple second bearing bushes are radially slidably mounted inside the second bearing housing around the main shaft. A second adjustment device is installed on the second bearing housing at the position corresponding to each second bearing bush, and the second adjustment device is used to adjust the gap between the second bearing bush and the main shaft. A second displacement sensor for detecting the position of the second bearing bushes is also installed on the second bearing housing.

[0011] Both the first and second adjustment devices include an adjustment push rod and two adjustment pull rods. In the first adjustment device, one end of the adjustment push rod abuts against the first bearing bush, and the other end is threadedly connected to the first bearing seat. The two adjustment pull rods of the first adjustment device are located on either side of the adjustment push rod, with one end axially limited by the first bearing bush and the other end threadedly connected to the first bearing seat. Similarly, in the second adjustment device, one end of the adjustment push rod abuts against the second bearing bush, and the other end is threadedly connected to the second bearing seat. The two adjustment pull rods of the second adjustment device are located on either side of the adjustment push rod, with one end axially limited by the second bearing bush and the other end threadedly connected to the second bearing seat.

[0012] The inner hole of the ring seat is equipped with a second oil baffle ring. The main shaft has a second ring cavity with its lower side open on the inner side of the flange. The second oil baffle ring extends upward into the second ring cavity, and a second oil cavity is formed between the second bearing seat and the second oil baffle ring. The outer surface of the second oil baffle ring is provided with a reverse spiral groove.

[0013] A second upper cover is installed on the second bearing housing, and a second oil inlet pipe and a second oil return pipe are installed on the second upper cover. The depth to which the second oil inlet pipe and the second oil return pipe are inserted into the second oil cavity is adjustable. The installation positions of the second oil inlet pipe and the second oil return pipe on the second upper cover can be interchanged and adjusted. A third temperature sensor is installed on the second bearing bush, and a fourth temperature sensor is installed on the second bearing housing. The fourth temperature sensor extends into the second oil cavity.

[0014] The test method using the aforementioned vertical hydro-generator bearing system simulation test device is used to simulate bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing bush support faults in the upper guide bearing and water guide bearing of the vertical hydro-generator. The test method steps are as follows:

[0015] The clearance between the first bearing bush and the main shaft in the first bearing group and / or the third bearing group is adjusted by the first adjustment device.

[0016] When the gap between the first bearing bush and the main shaft is too small to form a lubricating oil film, the working surface of the first bearing bush and the working surface of the main shaft are subjected to non-liquid lubrication friction, which is used to simulate bearing rubbing failure.

[0017] When the gap between each of the first bearing bushes and the main shaft is uneven, it is used to simulate a bearing gap unevenness fault;

[0018] When the clearance between the first bearing bush and the main shaft is too large or too small, it is used to simulate a fault where the bearing clearance is too large or too small.

[0019] When the first adjustment device becomes loose, it is used to simulate a loose bearing support failure;

[0020] Start the drive to rotate the spindle, and use monitoring equipment to collect the runout, vibration, acceleration and noise of the bearing system under different fault modes.

[0021] The test method using the aforementioned vertical hydro-generator bearing system simulation test device is used to simulate bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing bush support faults in the lower guide bearing of a vertical hydro-generator, as well as horizontal non-compliance and loose support faults in the thrust bearing. The test method steps are as follows:

[0022] The clearance between the second bearing bush and the main shaft in the second bearing assembly is adjusted by the second adjustment device.

[0023] When the gap between the second bearing and the main shaft is too small to form a lubricating oil film, the working surface of the second bearing and the working surface of the main shaft are subjected to non-liquid lubrication friction, which is used to simulate the bearing rubbing failure of the lower guide bearing.

[0024] When the gap between each of the second bearing bushes and the main shaft is uneven, it is used to simulate the bearing gap unevenness fault of the lower guide bearing;

[0025] When the clearance between the second bearing bush and the main shaft is too large or too small, it is used to simulate a fault where the clearance of the lower guide bearing is too large or too small.

[0026] When the second adjustment device becomes loose, it is used to simulate a loose bearing support failure of the lower guide bearing;

[0027] The height of each thrust bearing can be adjusted by rotating the height adjustment screw;

[0028] When the heights of the thrust bearings are not on the same horizontal plane, it is used to simulate a thrust bearing level failure.

[0029] When the height adjustment screw becomes loose, it is used to simulate a thrust bearing support loosening fault;

[0030] Start the drive to rotate the spindle, and use monitoring equipment to collect the shaft runout, vibration, acceleration and noise under the different fault modes mentioned above.

[0031] The present invention has the following beneficial effects:

[0032] 1. The first bearing assembly of this invention is used to simulate the upper guide bearing of a real vertical hydro-generator unit; the second bearing assembly is used to simulate the lower guide bearing and thrust bearing of a real vertical hydro-generator unit; the third bearing assembly is used to simulate the water guide bearing of a real vertical hydro-generator unit; and the rotor is used to simulate the rotor of a vertical hydro-generator unit. The clearance between the first bearing bush and the main shaft is adjusted by a first adjusting device, thereby simulating bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing bush support faults in the upper guide bearing and water guide bearing of a vertical hydro-generator unit.

[0033] 2. The thrust bearing of this invention is used to simulate the thrust bearing of a real vertical hydro-generator unit, and the friction ring is used to simulate the mirror plate of a real vertical hydro-generator unit. The clearance between the second bearing and the main shaft is adjusted by a second adjustment device, thereby simulating bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing support faults in the lower guide bearing of a vertical hydro-generator unit. Furthermore, by adjusting the height adjustment screw, it can also simulate substandard thrust bearing level and loose support faults in a vertical hydro-generator unit.

[0034] 3. During the simulation test, this invention monitors the status of the vertical turbine generator bearing system simulation test device under different faults, including shaft runout, vibration, acceleration and noise, so as to analyze the faults of the turbine generator bearing system under actual conditions and provide data support for the research and prediction of faults of vertical turbine generator bearing systems. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a three-dimensional structural schematic diagram of the bearing system test device of the present invention.

[0037] Figure 2 This is a cross-sectional structural schematic diagram of the bearing system test device of the present invention.

[0038] Figure 3This is a schematic diagram of the main structure of the bearing system of the present invention.

[0039] Figure 4 for Figure 3 A schematic diagram of the longitudinal cross-section structure.

[0040] Figure 5 for Figure 4 A schematic diagram of the front view of point A in the middle.

[0041] Figure 6 for Figure 4 A schematic diagram of the front view of the structure at point B.

[0042] Figure 7 This is a three-dimensional structural diagram of the first bearing assembly of the present invention.

[0043] Figure 8 This is a three-dimensional structural diagram of the second bearing assembly of the present invention.

[0044] Figure label:

[0045] Rack 10, First Platform 11, Second Platform 12, Third Platform 13, Fourth Platform 14,

[0046] First bearing assembly 20, first bearing housing 21, first guide post 211, second temperature sensor 212, first oil baffle ring 22, first pressure seat 23, first bearing bush 24, first temperature sensor 241, first elongated hole 242, adjusting push rod 25, adjusting pull rod 26, first displacement sensor 27, first upper cover 28, first oil inlet pipe 281, first oil return pipe 282, first oil chamber 29.

[0047] Second bearing assembly 30, second bearing seat 31, second pressure seat 311, fourth temperature sensor 312, second guide column 313, ring seat 32, height adjusting screw 321, second oil baffle ring 33, thrust bearing 34, friction ring 35, second bearing bush 36, third temperature sensor 361, second elongated hole 362, second displacement sensor 37, second upper cover 38, second oil inlet pipe 381, second oil return pipe 382, ​​second oil chamber 39;

[0048] Third bearing assembly 40, driver 50;

[0049] Main spindle 60, spindle head 61, first annular cavity 611, flange 62, second annular cavity 63

[0050] Rotor 70, friction rod 80. Detailed Implementation

[0051] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Example 1:

[0053] See Figure 1-8 This invention provides a simulation test device for a bearing system of a vertical hydro-generator set, comprising a frame 10, a first bearing assembly 20, a second bearing assembly 30, a third bearing assembly 40, a driver 50, a main shaft 60, and a rotor 70. The frame 10 is arranged from top to bottom with a first platform 11, a second platform 12, a third platform 13, and a fourth platform 14. The first bearing assembly 20 is mounted on the first platform 11, the second bearing assembly 30 on the second platform 12, the third bearing assembly 40 on the third platform 13, and the driver 50 on the fourth platform 14. The main shaft 60 is longitudinally mounted on the first bearing assembly 20, the second bearing assembly 30, and the third bearing assembly 40, and the main shaft 60 is movably and adjustablely connected to the output shaft of the driver 50. This connection method includes an elastic link and a non-contact magnetic coupling. A non-contact magnetic coupling connection is preferred, as this method can eliminate the influence of mechanical vibration of the motor shaft on the shaft system test device, thus eliminating interference. Both the first bearing assembly 20 and the third bearing assembly 40 include a first bearing seat 21, a first bearing bush 24, and a first adjustment device. The two first bearing seats 21 are respectively mounted on the first platform 11 and the third platform 13. Multiple first bearing bushes 24 are radially slidably mounted inside the first bearing seat 21 around the main shaft 60. A first adjustment device is installed on the first bearing seat 21 at the position corresponding to each first bearing bush 24. The first adjustment device is used to adjust the gap between the first bearing bush 24 and the main shaft 60. A first displacement sensor 27 for detecting the position of the first bearing bush 24 is also installed on the first bearing seat 21.

[0054] The first bearing group 20 is used to simulate the upper guide bearing of a real vertical hydro-generator unit, the second bearing group 30 is used to simulate the lower guide bearing and thrust bearing of a real vertical hydro-generator unit, and the third bearing group 40 is used to simulate the water guide bearing of a real vertical hydro-generator unit.

[0055] In this embodiment, the clearance between the first bearing bush 24 and the main shaft 60 is adjusted by the first adjustment device, thereby simulating bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing bush support faults in the upper guide bearing and water guide bearing of the vertical hydro-generator set.

[0056] The first displacement sensor 27 is an LVDT linear displacement sensor, see [link / reference] Figure 7The first displacement sensor 27 is radially mounted on the first bearing seat 21. The detection end of the first displacement sensor 27 abuts against the outer wall of the first bearing shell 24, thereby facilitating the measurement of the position of the first bearing shell 24 and the calculation of the gap between the first bearing shell 24 and the main shaft 60.

[0057] See Figure 4 , 5 7. On the main shaft 60, at the locations of the first bearing group 20 and the third bearing group 40, there are first annular cavities 611 with open lower sides, respectively. A first oil-retaining ring 22 is installed in the inner hole of the first bearing seat 21 of the first bearing group 20, extending upward into the first annular cavity 611. A first oil chamber 29 is formed between the first bearing seat 21 and the first oil-retaining ring 22. The first bearing bush 24 surrounds the outer wall of the main shaft 60. During testing, oil is injected into the first oil chamber 29 to further simulate the lubrication environment of the first bearing bush 24. The outer surface of the first oil-retaining ring 22 is provided with a reverse spiral groove. When the main shaft rotates, the reverse spiral groove can activate the action of a spin pump, causing the oil in the spiral groove to have a downward flow tendency, preventing the oil from overflowing from the top of the first oil-retaining ring 22 during movement.

[0058] In this embodiment, a shaft head 61 is mounted on the top of the spindle 60, and the first annular cavity 611 at the first bearing assembly 20 is formed by the shaft head 61 and the outer circumference of the spindle 60.

[0059] Similarly, see Figure 4 The first oil retaining ring 22 of the third bearing assembly 40 extends upward into the first annular cavity 611 located at the third bearing assembly 40.

[0060] To prevent lubricating oil from splashing in the first oil chamber 29 when the spindle 60 rotates rapidly, see [reference needed]. Figure 5 A first upper cover 28 is installed on the first bearing housing 21. A first oil inlet pipe 281 and a first oil return pipe 282 are also installed on the first upper cover 28. During testing, lubricating oil is injected into the first oil chamber 29 through the first oil inlet pipe 281 and extracted through the first oil return pipe 282, thus simulating the circulating lubrication environment under real conditions. The number of first oil inlet pipes 281 and first oil return pipes 282 can be one or more; in this embodiment, there are two first oil inlet pipes 281 and two first oil return pipes 282.

[0061] The insertion depth of the first oil inlet pipe 281 and the first oil return pipe 282 into the first oil chamber 29 is adjustable, and their installation positions on the first upper cover 28 are interchangeable. The first oil inlet pipe 281 and the first oil return pipe 282 are connected to an external oil circulation cooling device, which circulates and cools the oil in the oil tank to prevent overheating. By adjusting the arrangement of the first oil inlet pipe 281 and the first oil return pipe 282 on the first upper cover 28 and their insertion depth into the first oil chamber 29, the circulation oil circuit can be adjusted to meet the personalized requirements of the circulation oil circuit during different fault simulation tests.

[0062] Furthermore, in order to facilitate the measurement of the temperature of the first bearing shell 24 and the temperature of the lubricated material in the first oil cavity 29 during the simulation test, a first temperature sensor 241 is installed on the first bearing shell 24, and a second temperature sensor 212 is installed on the first bearing seat 21, with the second temperature sensor 212 extending into the first oil cavity 29.

[0063] Specifically, the first temperature sensor 241 and the second temperature sensor 212 can be PT100 platinum resistance temperature sensors. A mounting hole is provided on the outer side of the first bearing shell 24, and the probe of the PT100 platinum resistance temperature sensor is embedded in the mounting hole of the first bearing shell 24. The cable of the first temperature sensor 241 passes through the outer wall of the first bearing housing 21 in a sealed manner.

[0064] Example 2:

[0065] Based on Embodiment 1, the second bearing assembly 30 includes a second bearing seat 31, an annular seat 32, a thrust bearing 34, a friction ring 35, a second bearing bush 36, and a second adjustment device. The second bearing seat 31 is mounted on the second platform 12, and the annular seat 32 is mounted on the bottom of the second bearing seat 31. Multiple mounting grooves are provided around the main shaft 60 on the upper side of the annular seat 32, and the thrust bearing 34 is installed in the mounting grooves. A flange 62 is provided on the outer wall of the main shaft 60, and a friction ring 35 is installed on the lower side of the flange 62. The friction ring 35 is supported on the thrust bearing 34. A height adjustment screw 321 is threaded onto the corresponding position of the thrust bearing 34, and the height adjustment screw 321 is supported on the lower side of the thrust bearing 34; multiple second bearing bushes 36 are radially slidably mounted inside the second bearing housing 31 around the main shaft 60, and a second adjustment device is installed on the second bearing housing 31 at the position corresponding to each second bearing bush 36, the second adjustment device being used to adjust the gap between the second bearing bush 36 and the main shaft 60; a second displacement sensor 37 for detecting the position of the second bearing bush 36 is also installed on the second bearing housing 31.

[0066] In this embodiment, the thrust bearing 34 is used to simulate the thrust bearing of a real vertical hydro-generator unit, and the friction ring 35 is used to simulate the mirror plate of a real vertical hydro-generator unit. The clearance between the second bearing 36 and the main shaft 60 is adjusted by the second adjustment device to simulate bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing support faults in the lower guide bearing of the vertical hydro-generator unit. Furthermore, by adjusting the height adjustment screw 321, it can also simulate substandard thrust bearing level and loose support faults in the vertical hydro-generator unit.

[0067] In this embodiment, see Figure 5-8 Both the first and second adjustment devices include an adjustment push rod 25 and two adjustment pull rods 26.

[0068] Among them, see Figure 5 , 7 One end of the adjusting push rod 25 of the first adjusting device abuts against the first bearing bush 24, and the other end is threadedly connected to the first bearing seat 21. When the adjusting push rod 25 is rotated to move inward, it pushes the first bearing bush 24 inward. When the adjusting push rod 25 is rotated to move outward, it separates from the first bearing bush 24. The two adjusting pull rods 26 of the first adjusting device are located on both sides of the adjusting push rod 25. One end of the adjusting pull rod 26 is axially limited to the first bearing bush 24, that is, the adjusting pull rod 26 can rotate, but cannot produce axial displacement between the first bearing bush 24. The other end of the adjusting pull rod 26 is threadedly connected to the first bearing seat 21. When the adjusting pull rod 26 is rotated to move outward, it pulls the first bearing bush 24 outward. When the adjusting pull rod 26 is rotated to move inward, it separates from the first bearing bush 24.

[0069] See Figure 6 , 8 One end of the adjusting push rod 25 of the second adjusting device abuts against the second bearing bush 36, and the other end is threadedly connected to the second bearing seat 31. When the adjusting push rod 25 is rotated to move inward, it pushes the second bearing bush 36 inward. When the adjusting push rod 25 is rotated to move outward, it separates from the second bearing bush 36. The two adjusting pull rods 26 of the second adjusting device are located on both sides of the adjusting push rod 25. One end of the adjusting pull rod 26 is axially limited to the second bearing bush 36, that is, the adjusting pull rod 26 can rotate, but cannot produce axial displacement between the first bearing bush 24. The other end of the adjusting pull rod 26 is threadedly connected to the second bearing seat 31. When the adjusting pull rod 26 is rotated to move outward, it pulls the second bearing bush 36 outward. When the adjusting pull rod 26 is rotated to move inward, it separates from the second bearing bush 36.

[0070] In one embodiment, each adjusting rod 26 has a T-shaped head at its end, and the first bearing 24 and the second bearing 36 have T-shaped grooves. The T-shaped head is inserted into the T-shaped groove, and the width of the T-shaped head is less than the depth of the T-shaped groove. The T-shaped head can move axially along the adjusting rod 26 within the T-shaped groove. This allows the first bearing 24 and the second bearing 36 to be pulled outward when the adjusting rod 26 is pulled outward, and the T-shaped head to move within the gap of the T-shaped groove when the adjusting rod 26 is pushed inward, without the first bearing 24 and the second bearing 36 being pulled inward. The position of the first bearing 24 and the second bearing 36 is adjusted by the cooperation of the adjusting push rod 25 and the adjusting rod 26.

[0071] Further, see Figure 6 A second oil retainer ring 33 is installed in the inner hole of the ring seat 32. The main shaft 60 has a second annular cavity 63 located inside the flange 62. The second oil retainer ring 33 extends upward into the second annular cavity 63, forming a second oil cavity 39 between the second bearing seat 31 and the second oil retainer ring 33. During the test, oil is injected into the second oil cavity 39 to further simulate the lubrication environment of the second bearing bush 36.

[0072] The outer surface of the second oil ring 33 is provided with a reverse spiral groove. When the main shaft rotates, the reverse spiral groove can activate the action of a spin pump, so that the oil in the spiral groove has a downward flow tendency, preventing the oil from overflowing from the top of the second oil ring 33 during movement.

[0073] To prevent lubricating oil from splashing in the second oil chamber 39 during rapid rotation of the spindle 60, see [reference needed]. Figure 6 A second upper cover 38 is installed on the second bearing housing 31.

[0074] Furthermore, a second oil inlet pipe 381 and a second oil return pipe 382 are installed on the second upper cover 38. During the test, lubricating oil is injected into the second oil chamber 39 through the second oil inlet pipe 381 and extracted through the second oil return pipe 382, ​​thereby simulating the circulating lubrication environment under real conditions. The number of second oil inlet pipes 381 and second oil return pipes 382 can be one or more. In this embodiment, there are two second oil inlet pipes 381 and two second oil return pipes 382.

[0075] The insertion depth of the second oil inlet pipe 381 and the second oil return pipe 382 into the second oil chamber 39 is adjustable. The second oil inlet pipe 381 and the second oil return pipe 382 are connected to an external oil circulation cooling device, which circulates and cools the oil in the oil tank to prevent the oil temperature from becoming too high. By adjusting the arrangement of the second oil inlet pipe 381 and the second oil return pipe 382 on the second upper cover 38 and their insertion depth into the second oil chamber 39, the circulation oil circuit can be adjusted to meet the personalized requirements of the circulation oil circuit during different fault simulation tests.

[0076] Furthermore, a third temperature sensor 361 is installed on the second bearing bush 36 to facilitate the measurement of the temperature of the second bearing bush 36 during simulation tests. At the same time, a fourth temperature sensor 312 is installed on the second bearing housing 31, which extends into the second oil cavity 39 to facilitate the measurement of the temperature of the lubricated material in the second oil cavity 39.

[0077] Specifically, the third temperature sensor 361 and the fourth temperature sensor 312 can be PT100 platinum resistance temperature sensors. The installation method of the third temperature sensor 361 is the same as that of the first temperature sensor 241.

[0078] Further, see Figure 5 , 7 To improve the stability of the first bearing bush 24, a first pressure seat 23 is installed in the first bearing housing 21 at the position corresponding to the first bearing bush 24. The first pressure seat 23 is Z-shaped, and its upper end presses against the upper side of the first bearing bush 24. The first pressure seat 23 can move radially while ensuring that the first bearing bush 24 does not jump up and down. Furthermore, a first guide post 211 is provided in the first bearing housing 21 at the position corresponding to the first bearing bush 24. The first guide post 211 extends upward into the first elongated hole 242 on the lower side of the first bearing bush 24, thereby guiding and limiting the first bearing bush 24 and improving the installation stability of the first bearing bush 24.

[0079] Similarly, see Figure 6 , 8 To improve the stability of the second bearing bush 36, a second pressure seat 311 is installed in the second bearing housing 31 at the position corresponding to the second bearing bush 36. The second pressure seat 311 is Z-shaped, and its upper end presses against the upper side of the second bearing bush 36. The second pressure seat 311 can move radially while ensuring that the second bearing bush 36 does not jump up and down. Furthermore, a second guide post 313 is provided in the second bearing housing 31 at the position corresponding to the second bearing bush 36. The second guide post 313 extends upward into the second elongated hole 362 on the lower side of the second bearing bush 36, thereby guiding and limiting the second bearing bush 36 and improving the stability of the first bearing bush 24 installation.

[0080] Further, see Figure 1 , 2 A friction rod 80 is also installed on the frame 10. The friction rod 80 rubs against the outer circumference of the rotor 70. The rotor 70 is used to simulate the rotor of a vertical hydro-generator set, thereby simulating rotor friction failure of a vertical hydro-generator set.

[0081] Example 3:

[0082] Based on Example 1, see Figure 5 , 7The test method using the aforementioned vertical hydro-generator bearing system simulation test device is used to simulate bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing bush support faults in the upper guide bearing and water guide bearing of the vertical hydro-generator. The test method steps are as follows:

[0083] The clearance between the first bearing bush 24 and the main shaft 60 in the first bearing assembly 20 and / or the third bearing assembly 40 is adjusted by the first adjustment device.

[0084] When the gap between the first bearing bush 24 and the main shaft 60 is too small to form a lubricating oil film, the working surface of the first bearing bush 24 and the working surface of the main shaft 60 are non-liquid lubricated friction, which is used to simulate bearing rubbing failure.

[0085] When the gap between each of the first bearing bushes 24 and the main shaft 60 is uneven, it is used to simulate a bearing gap unevenness fault.

[0086] When the clearance between the first bearing bush 24 and the main shaft 60 is too large or too small, it is used to simulate a fault where the bearing clearance is too large or too small.

[0087] When the first adjustment device becomes loose, it is used to simulate a loose bearing support failure;

[0088] Start the driver 50 to drive the spindle 60 to rotate, and use the monitoring equipment to collect the runout, vibration, acceleration and noise of the bearing system under different fault modes.

[0089] During the simulation test, the status of the vertical turbine generator bearing system simulation test device is monitored under different faults, including bearing system swing, vibration, acceleration, oil temperature and noise. This data is used to analyze the actual faults of the turbine generator bearing system and provide data support for the research and prediction of vertical turbine generator bearing system faults.

[0090] Example 4:

[0091] Based on Example 2, the test method of the vertical hydro-generator bearing system simulation test device is used to simulate bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing bush support of the lower guide bearing of the vertical hydro-generator, as well as the horizontal non-compliance and loose support of the thrust bearing. The test steps are as follows:

[0092] The gap between the second bearing bush 36 and the main shaft 60 in the second bearing assembly 30 is adjusted by the second adjustment device.

[0093] When the gap between the second bearing bush 36 and the main shaft 60 is too small to form a lubricating oil film, the working surface of the second bearing bush 36 and the working surface of the main shaft 60 are non-liquid lubricated friction, which is used to simulate the bearing rubbing failure of the lower guide bearing.

[0094] When the gap between each of the second bearing shells 36 and the main shaft 60 is uneven, it is used to simulate the bearing gap unevenness fault of the lower guide bearing;

[0095] When the clearance between the second bearing shell 36 and the main shaft 60 is too large or too small, it is used to simulate the failure of the lower guide bearing having too large / too small bearing clearance.

[0096] When the second adjustment device becomes loose, it is used to simulate a loose bearing support failure of the lower guide bearing;

[0097] The height of each thrust bearing 34 can be adjusted by rotating the height adjusting screw 321;

[0098] When the heights of the thrust bearings 34 are not on the same horizontal plane, it is used to simulate a thrust bearing level failure.

[0099] When the height adjustment screw 321 is loose, it is used to simulate a thrust bearing support loosening fault;

[0100] Start the driver 50 to drive the spindle 60 to rotate, and use the monitoring equipment to collect the runout, vibration, acceleration and noise of the bearing system under different fault modes.

[0101] Similarly, during the simulation test, the status of the vertical turbine generator bearing system simulation test device under different faults is monitored, including the bearing system's swing, vibration, acceleration, oil temperature, and noise status. This data is used to analyze the actual faults of the turbine generator bearing system and provide data support for the research and prediction of vertical turbine generator bearing system faults.

Claims

1. A simulation test device for a bearing system of a vertical hydro-generator unit, characterized in that: The device includes a frame (10), a first bearing assembly (20), a second bearing assembly (30), a third bearing assembly (40), a driver (50), a spindle (60), and a rotor (70). The frame (10) is provided with a first platform (11), a second platform (12), a third platform (13), and a fourth platform (14) from top to bottom. The first bearing assembly (20) is installed on the first platform (11), the second bearing assembly (30) is installed on the second platform (12), the third bearing assembly (40) is installed on the third platform (13), the driver (50) is installed on the fourth platform (14), and the spindle (60) is longitudinally installed on the first bearing assembly (20), the second bearing assembly (30), and the third bearing assembly (40). The spindle (60) is movably and adjustablely connected to the output shaft of the driver (50). Both the first bearing assembly (20) and the third bearing assembly (40) include a first bearing seat (21), a first bearing bush (24), and a first adjustment device. The two first bearing seats (21) are respectively installed on the first platform (11) and the third platform (13). Multiple first bearing bushes (24) are installed radially around the main shaft (60) inside the first bearing seat (21). A first adjustment device is installed on the first bearing seat (21) at the position corresponding to each first bearing bush (24). The first adjustment device is used to adjust the gap between the first bearing bush (24) and the main shaft (60). A first displacement sensor (27) for detecting the position of the first bearing bush (24) is also installed on the first bearing seat (21). The second bearing assembly (30) includes a second bearing seat (31), an annular seat (32), a thrust bearing (34), a friction ring (35), a second bearing bush (36), and a second adjustment device. The second bearing seat (31) is mounted on the second platform (12), and the annular seat (32) is mounted on the bottom of the second bearing seat (31). The upper side of the annular seat (32) is provided with multiple mounting grooves around the main shaft (60), and the thrust bearing (34) is installed in the mounting grooves. The outer wall of the main shaft (60) is provided with a flange (62), and the lower side of the flange (62) is provided with a friction ring (35). The friction ring (35) is supported on the thrust bearing (34). The annular seat (32) A height adjustment screw (321) is threaded onto the thrust bearing (34) at the corresponding position, and the height adjustment screw (321) is supported on the lower side of the thrust bearing (34); multiple second bearing bushes (36) are radially slidably mounted inside the second bearing housing (31) around the main shaft (60), and a second adjustment device is installed on the second bearing housing (31) at the corresponding position of each second bearing bush (36), the second adjustment device being used to adjust the gap between the second bearing bush (36) and the main shaft (60); a second displacement sensor (37) for detecting the position of the second bearing bush (36) is also installed on the second bearing housing (31); The inner hole of the ring seat (32) is equipped with a second oil baffle ring (33). The main shaft (60) has a second annular cavity (63) with its lower side open on the inner side of the flange (62). The second oil baffle ring (33) extends upward into the second annular cavity (63). A second oil cavity (39) is formed between the second bearing seat (31) and the second oil baffle ring (33). The outer surface of the second oil baffle ring (33) is provided with a reverse spiral groove. A second upper cover (38) is installed on the second bearing housing (31). A second oil inlet pipe (381) and a second oil return pipe (382) are installed on the second upper cover (38). The depth of the second oil inlet pipe (381) and the second oil return pipe (382) inserted into the second oil cavity (39) is adjustable. The installation positions of the second oil inlet pipe (381) and the second oil return pipe (382) on the second upper cover (38) can be interchanged and adjusted. A third temperature sensor (361) is installed on the second bearing bush (36). A fourth temperature sensor (312) is installed on the second bearing housing (31). The fourth temperature sensor (312) extends into the second oil cavity (39).

2. The vertical hydro-generator unit bearing system simulation test device according to claim 1, characterized in that: The main shaft (60) has a first annular cavity (611) with its lower side open at the first bearing group (20) and the third bearing group (40), respectively. The inner hole of the first bearing seat (21) is fitted with a first oil baffle ring (22). The first oil baffle ring (22) extends upward into the first annular cavity (611). A first oil cavity (29) is formed between the first bearing seat (21) and the first oil baffle ring (22). The first bearing bush (24) surrounds the outer wall of the main shaft (60). The outer surface of the first oil baffle ring (22) is provided with a reverse spiral groove.

3. The vertical hydro-generator unit bearing system simulation test device according to claim 2, characterized in that: A first upper cover (28) is installed on the first bearing housing (21). A first oil inlet pipe (281) and a first oil return pipe (282) are installed on the first upper cover (28). The depth to which the first oil inlet pipe (281) and the first oil return pipe (282) are inserted into the first oil chamber (29) is adjustable. The installation positions of the first oil inlet pipe (281) and the first oil return pipe (282) on the first upper cover (28) can be interchanged and adjusted.

4. The vertical hydro-generator unit bearing system simulation test device according to claim 3, characterized in that: A first temperature sensor (241) is installed on the first bearing bush (24), and a second temperature sensor (212) is installed on the first bearing housing (21). The second temperature sensor (212) extends into the first oil chamber (29).

5. The simulation test device for the bearing system of a vertical hydro-generator unit according to claim 1, characterized in that: Both the first and second adjustment devices include an adjustment push rod (25) and two adjustment pull rods (26). The adjustment push rod (25) of the first adjustment device has one end abutting against the first bearing shell (24) and the other end threadedly connected to the first bearing seat (21). The two adjustment pull rods (26) of the first adjustment device are located on both sides of the adjustment push rod (25). One end of the adjustment pull rod (26) is axially limited and connected to the first bearing shell (24), and the other end is threadedly connected to the first bearing seat (21). The adjustment push rod (25) of the second adjustment device has one end abutting against the second bearing shell (36) and the other end threadedly connected to the second bearing seat (31). The two adjustment pull rods (26) of the second adjustment device are located on both sides of the adjustment push rod (25). One end of the adjustment pull rod (26) is axially limited and connected to the second bearing shell (36), and the other end is threadedly connected to the second bearing seat (31).

6. A test method using the vertical hydro-generator bearing system simulation test device according to any one of claims 1 to 4, characterized in that: The test method and steps are as follows to simulate bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing bush support faults in the upper guide bearing and water guide bearing of a vertical hydro-generator unit: The clearance between the first bearing bush (24) and the main shaft (60) in the first bearing assembly (20) and / or the third bearing assembly (40) is adjusted by the first adjustment device; When the gap between the first bearing bush (24) and the main shaft (60) is too small and a lubricating oil film cannot be formed, the working surface of the first bearing bush (24) and the working surface of the main shaft (60) are non-liquid lubricated friction, which is used to simulate bearing rubbing failure. When the gap between each of the first bearing bushes (24) and the main shaft (60) is uneven, it is used to simulate a bearing gap unevenness fault; When the clearance between the first bearing bush (24) and the main shaft (60) is too large or too small, it is used to simulate a fault where the bearing clearance is too large or too small. When the first adjustment device becomes loose, it is used to simulate a loose bearing support failure; Start the driver (50) to drive the spindle (60) to rotate, and collect the bearing system's runout, vibration, acceleration and noise under different fault modes through the monitoring equipment.

7. A test method using the vertical hydro-generator bearing system simulation test device according to claim 1 or 5, characterized in that: The test method is as follows to simulate bearing rubbing, uneven bearing clearance, excessive / small bearing clearance, and loose bearing bush support faults in the lower guide bearing of a vertical hydro-generator unit, as well as level defects and loose support faults in the thrust bearing: The gap between the second bearing bush (36) and the main shaft (60) in the second bearing assembly (30) is adjusted by the second adjustment device; When the gap between the second bearing bush (36) and the main shaft (60) is too small and a lubricating oil film cannot be formed, the working surface of the second bearing bush (36) and the working surface of the main shaft (60) are non-liquid lubricated friction, which is used to simulate the bearing rubbing failure of the lower guide bearing. When the gap between each of the second bearing bushes (36) and the main shaft (60) is uneven, it is used to simulate the bearing gap unevenness fault of the lower guide bearing; When the clearance between the second bearing bush (36) and the main shaft (60) is too large or too small, it is used to simulate the fault of the clearance of the lower guide bearing being too large / too small. When the second adjustment device becomes loose, it is used to simulate a loose bearing support failure of the lower guide bearing; The height of each of the thrust bearings (34) can be adjusted by rotating the height adjustment screw (321); When the heights of the thrust bearings (34) are not on the same horizontal plane, it is used to simulate a thrust bearing level failure. When the height adjustment screw (321) is loose, it is used to simulate a thrust bearing support loosening fault; Start the driver (50) to drive the spindle (60) to rotate, and collect the bearing system's runout, vibration, acceleration and noise under different fault modes through the monitoring equipment.

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