Vertical water-turbine generator set bearing system simulation test device and test method thereof

Abstract

The invention discloses a vertical water-turbine generator set bearing system simulation test device and a test method thereof.The vertical water-turbine generator set bearing system simulation test device comprises a rack, a first bearing set, a second bearing set, a third bearing set, a driver, a main shaft and a rotor, and 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 pack is installed on the first platform, the second bearing pack is installed on the second platform, the third bearing pack is installed on the third platform, the driver is installed on the fourth platform, the main shaft is longitudinally installed on the first bearing pack, the second bearing pack and the third bearing pack, and the main shaft is in butt joint with an output shaft of the driver. By monitoring the state of the simulation test device for the bearing system of the vertical water-turbine generator set under different faults, the faults of the bearing system of the water-turbine generator set under actual conditions are analyzed, and data support is provided for research and prediction of the faults of the bearing system of the vertical water-turbine generator set.

Description

Technical Field

[0001] The present invention relates to the technical field of vertical hydrogenerator simulation tests, and more particularly to a simulation test device and a test method for a bearing system of a vertical hydrogenerator set. Background Art

[0002] A vertical hydrogenerator is an important hydropower equipment, an essential part of the hydropower generation industry, and an important equipment for making full use of clean and renewable energy to achieve energy conservation and emission reduction and reduce environmental pollution. The vertical hydrogenerator has a compact structure, high efficiency, and can adapt to a wide range of water heads. It is one of the widely used hydrogenerator types in the world. Based on this, the research and prediction of the bearing system faults of the vertical hydrogenerator are of great significance to the design and daily maintenance of the hydroturbine.

[0003] Chinese patent document CN107219040A discloses a dynamic balance device for simulating a vertical hydrogenerator set, which includes a main cabinet, a driving motor corresponding to and connected above the main cabinet, the driving motor is correspondingly connected to a coupling, the coupling is correspondingly connected to a main shaft, an upper bearing is provided at one end of the main shaft, a lower balance wheel is provided at the other end of the main shaft, and an upper balance wheel and a lower bearing are sequentially provided in the middle of the main shaft. Its characteristics are: it can achieve the purpose of simulating and controlling the vibration balance by installing balance blocks on the balance wheels and adjusting the mass and position of the balance blocks; its disadvantages are: this device is mainly used to simulate the dynamic balance of the rotor of the vertical hydrogenerator set and does not involve the simulation of the bearing system faults of the vertical hydrogenerator set. Summary of the Invention

[0004] To solve the existing technical problems, the main purpose of the present invention is to provide a simulation test device and a test method for a bearing system of a vertical hydrogenerator set. By simulating different bearing system fault states, these faults can be reproduced more realistically. By monitoring the states of the simulation test device for the bearing system of the vertical hydrogenerator set under different faults, including shaft system deflection, vibration, acceleration, oil temperature, and noise states, it can be used to analyze the bearing system faults of the hydrogenerator set in actual situations and provide data support for the research and prediction of the bearing system faults of the vertical hydrogenerator set.

[0005] The technical solution adopted by the present invention is as follows: A vertical hydro-generator bearing system simulation test device includes a frame, a first bearing group, a second bearing group, a third bearing group, a driver, a main shaft and a rotor. The frame is sequentially provided with a first platform, a second platform, a third platform and a fourth platform from top to bottom. The first bearing group is installed on the first platform, the second bearing group is installed on the second platform, the third bearing group is installed on the third platform, the driver is installed on the fourth platform, and the main shaft is longitudinally installed on the first bearing group, the second bearing group and the third bearing group, and the main shaft is movably and adjustably docked with the output shaft of the driver; Both the first bearing group and the third bearing group include a first bearing seat, a first bearing bush and a first adjustment device. The two first bearing seats are respectively installed on the first platform and the third platform. A plurality of first bearing bushes are installed inside the first bearing seat and slide radially around the main shaft. First adjustment devices are respectively installed on the first bearing seat at positions corresponding to the first bearing bushes. 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 seat.

[0006] At the positions of the first bearing group and the third bearing group on the main shaft, first annular cavities with open lower sides are respectively provided. The inner hole of the first bearing seat is provided with a first oil baffle ring. The first oil baffle ring extends upward into the first annular cavity. 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 a reverse spiral groove is provided on the outer surface of the first oil baffle ring.

[0007] A first upper cover is installed on the first bearing seat. A first oil inlet pipe and a first oil return pipe are installed on the first upper cover. The depths of insertion of the first oil inlet pipe and the first oil return pipe into the first oil cavity are adjustable, and the installation positions of the first oil inlet pipe and the first oil return pipe on the first upper cover can be replaced and adjusted with each other.

[0008] A first temperature sensor is installed on the first bearing bush, and a second temperature sensor is installed on the first bearing seat. The second temperature sensor extends into the first oil cavity.

[0009] The second bearing group includes a second bearing block, a ring seat, thrust pads, friction rings, second bearing bushes, and a second adjustment device. The second bearing block is installed on the second platform. The ring seat is installed at the bottom of the second bearing block. A plurality of mounting grooves are provided on the upper side of the ring seat around the main shaft, and thrust pads 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. The friction ring is supported on the thrust pads. A height adjustment screw is threadedly connected to the ring seat at a position corresponding to the thrust pad, and the height adjustment screw supports the lower side of the thrust pad. A plurality of second bearing bushes are installed in the second bearing block to slide radially around the main shaft. Second adjustment devices are respectively installed on the second bearing block at positions corresponding to the second bearing bushes. 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 bush is also installed on the second bearing block.

[0010] Both the first adjustment device and the second adjustment device include an adjustment push rod and two adjustment pull rods. Among them, one end of the adjustment push rod of the first adjustment device abuts against the first bearing bush, and the other end is threadedly connected and rotated with the first bearing block. The two adjustment pull rods of the first adjustment device are respectively located on both sides of the adjustment push rod. One end of the adjustment pull rod is axially and limit-connected to the first bearing bush, and the other end is threadedly connected and rotated with the first bearing block. One end of the adjustment push rod of the second adjustment device abuts against the second bearing bush, and the other end is threadedly connected and rotated with the second bearing block. The two adjustment pull rods of the second adjustment device are respectively located on both sides of the adjustment push rod. One end of the adjustment pull rod is axially and limit-connected to the second bearing bush, and the other end is threadedly connected and rotated with the second bearing block.

[0011] A second oil baffle ring is installed in the inner hole of the ring seat. A second ring cavity with an open lower side is provided on the main shaft inside the flange. The second oil baffle ring extends upward into the second ring cavity. A second oil chamber is formed between the second bearing block and the second oil baffle ring. Reverse spiral grooves are provided on the outer surface of the second oil baffle ring.

[0012] A second upper cover is installed on the second bearing block. A second oil inlet pipe and a second oil return pipe are installed on the second upper cover. The depths at which the second oil inlet pipe and the second oil return pipe are inserted into the second oil chamber are adjustable, and the installation positions of the second oil inlet pipe and the second oil return pipe on the second upper cover can be replaced and adjusted with each other. A third temperature sensor is installed on the second bearing bush, and a fourth temperature sensor is installed on the second bearing block. The fourth temperature sensor extends into the second oil chamber.

[0013] The test method using the test device for the bearing system of the vertical hydro-generator set is used to simulate the bearing rubbing, uneven bearing clearances, too large / small bearing clearances, and loose bearing bush supports of the upper guide bearing and the water guide bearing on the vertical hydro-generator set. The steps of the test method are as follows: Adjust the clearance between the first bearing bush and the main shaft in the first bearing group and / or the third bearing group through the first adjusting device; When the clearance between the first bearing bush and the main shaft is too small to form a lubricating oil film, the working surfaces of the first bearing bush and the main shaft are in non-liquid lubrication friction at this time, which is used to simulate the bearing rubbing fault; When the clearances between the first bearing bushes and the main shaft are uneven, it is used to simulate the bearing clearance unevenness fault; When the clearance between the first bearing bush and the main shaft is too large or too small, it is used to simulate the bearing clearance too large / small fault; When the first adjusting device is loose, it is used to simulate the bearing bush support looseness fault; Start the driver to drive the main shaft to rotate, and sequentially collect the swing, vibration, acceleration and noise of the bearing system under the above different fault modes through the monitoring equipment.

[0014] Adopt the test method of the vertical hydro-generator set bearing system simulation test device to simulate the bearing rubbing, bearing clearance unevenness, bearing clearance too large / small and bearing bush support looseness faults of the lower guide bearing of the vertical hydro-generator set, as well as the horizontal non-conformity and support looseness faults of the thrust bearing. The test method steps are as follows: Adjust the clearance between the second bearing bush and the main shaft in the second bearing group through the second adjusting device; When the clearance between the second bearing bush and the main shaft is too small to form a lubricating oil film, the working surfaces of the second bearing bush and the main shaft are in non-liquid lubrication friction at this time, which is used to simulate the bearing rubbing fault of the lower guide bearing; When the clearances between the second bearing bushes and the main shaft are uneven, it is used to simulate the bearing clearance unevenness fault of the lower guide bearing; When the clearance between the second bearing bush and the main shaft is too large or too small, it is used to simulate the bearing clearance too large / small fault of the lower guide bearing; When the second adjusting device is loose, it is used to simulate the bearing bush support looseness fault of the lower guide bearing; Adjust the height of each thrust bearing bush by rotating and adjusting the height adjusting screw; When the heights of the thrust bearing bushes are not on the same horizontal plane, it is used to simulate the horizontal non-conformity fault of the thrust bearing; When the height adjusting screw is loose, it is used to simulate the thrust bearing support looseness fault; Start the driver to drive the main shaft to rotate, and sequentially collect the swing, vibration, acceleration and noise of the shafting under the above different fault modes through the monitoring equipment.

[0015] The present invention has the following beneficial effects: 1. The first bearing group of the present invention is used to simulate the upper guide bearing of a real vertical hydro-generator set, the second bearing group is used to simulate the lower guide bearing and thrust bearing of a real vertical hydro-generator set, the third bearing group is used to simulate the water guide bearing of a real vertical hydro-generator set, and the rotor is used to simulate the rotor of a vertical hydro-generator set. The gap between the first bearing bush and the main shaft is adjusted by the first adjusting device, so as to simulate the bearing rubbing, uneven bearing clearance, too large / small bearing clearance, and loose bearing bush support faults of the upper guide bearing and water guide bearing of a vertical hydro-generator set.

[0016] 2. The thrust bearing bush of the present invention is used to simulate the thrust bearing bush of a real vertical hydro-generator set, and the friction ring is used to simulate the mirror plate of a real vertical hydro-generator set. The gap between the second bearing bush and the main shaft is adjusted by the second adjusting device, so as to simulate the bearing rubbing, uneven bearing clearance, too large / small bearing clearance, and loose bearing bush support faults of the lower guide bearing of a vertical hydro-generator set. And by adjusting the height adjusting screw, it can also be used to simulate the unqualified horizontal and loose support faults of the thrust bearing of a vertical hydro-generator set.

[0017] 3. During the simulation test of the present invention, by monitoring the states of the bearing system simulation test device of the vertical hydro-generator set under different faults, including the shaft system swing, vibration, acceleration and noise states, so as to analyze the faults of the bearing system of the hydro-generator set in actual situations, and provide data support for the research and prediction of the faults of the bearing system of the vertical hydro-generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the bearing system test device of the present invention.

[0020] Figure 2 It is a sectional structural schematic diagram of the bearing system test device of the present invention.

[0021] Figure 3 It is a front view structural schematic diagram of the bearing system of the present invention.

[0022] Figure 4 For Figure 3 longitudinal sectional structural schematic diagram.

[0023] Figure 5 For Figure 4Front view structure schematic diagram of position A in [the device].

[0024] Figure 6 is Figure 4 Front view structure schematic diagram of position B in [the device].

[0025] Figure 7 Stereo structure schematic diagram of the first bearing group of the present invention.

[0026] Figure 8 Stereo structure schematic diagram of the second bearing group of the present invention.

[0027] Reference numerals: Frame 10, first platform 11, second platform 12, third platform 13, fourth platform 14, First bearing group 20, first bearing seat 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 long 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 cavity 29, Second bearing group 30, second bearing seat 31, second pressure seat 311, fourth temperature sensor 312, second guide post 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 long hole 362, second displacement sensor 37, second upper cover 38, second oil inlet pipe 381, second oil return pipe 382, second oil cavity 39; Third bearing group 40, driver 50; Main shaft 60, shaft head 61, first annular cavity 611, flange 62, second annular cavity 63, Rotor 70, rubbing rod 80. Detailed implementation manners

[0028] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0029] Embodiment 1: Refer to Figure 1-8, the present invention provides a simulation test device for the bearing system of a vertical water turbine generator set, including a frame 10, a first bearing group 20, a second bearing group 30, a third bearing group 40, a driver 50, a main shaft 60 and a rotor 70. The frame 10 is sequentially 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 group 20 is installed on the first platform 11, the second bearing group 30 is installed on the second platform 12, the third bearing group 40 is installed on the third platform 13, and the driver 50 is installed on the fourth platform 14. The main shaft 60 is longitudinally installed on the first bearing group 20, the second bearing group 30 and the third bearing group 40, and the main shaft 60 is movably and adjustably docked with the output shaft of the driver 50. This connection method includes elastic connection and non-contact magnetic coupling connection. Preferably, non-contact magnetic coupling connection is used, which can eliminate the influence of the mechanical vibration of the motor axis on the shafting test device and eliminate interference. Both the first bearing group 20 and the third bearing group 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. A plurality of first bearing bushes 24 are radially slidably installed inside the first bearing seat 21 around the main shaft 60. First adjustment devices are respectively installed on the first bearing seat 21 at positions corresponding to the first bearing bushes 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.

[0030] The first bearing group 20 is used to simulate the upper guide bearing of a real vertical water turbine generator set, the second bearing group 30 is used to simulate the lower guide bearing and thrust bearing of a real vertical water turbine generator set, and the third bearing group 40 is used to simulate the water guide bearing of a real vertical water turbine generator set.

[0031] In this embodiment, the gap between the first bearing bush 24 and the main shaft 60 is adjusted by the first adjustment device, so as to simulate the bearing rubbing, uneven bearing clearance, too large / small bearing clearance, and loose bearing support of the upper guide bearing and water guide bearing of the vertical water turbine generator set.

[0032] The first displacement sensor 27 adopts an LVDT linear displacement sensor. See Figure 7 , the first displacement sensor 27 is radially installed on the first bearing seat 21, and the detection end of the first displacement sensor 27 abuts against the outer wall of the first bearing bush 24, so as to facilitate measuring the position of the first bearing bush 24 and further calculating the gap between the first bearing bush 24 and the main shaft 60.

[0033] See Figure 4 、 5, at 7, on the main shaft 60 at the positions of the first bearing group 20 and the third bearing group 40, there are respectively provided with first annular cavities 611 that are open at the lower side. The inner hole of the first bearing seat 21 of the first bearing group 20 is provided with a first oil retaining ring 22. The first oil retaining ring 22 extends 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 the test, 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 reverse spiral grooves. The reverse spiral grooves can play the role of a self-priming pump when the main shaft rotates, making the oil in the spiral grooves have a tendency to flow downward and preventing the oil from overflowing from the top of the first oil retaining ring 22 during movement.

[0034] In this embodiment, a shaft head 61 is installed at the top of the main shaft 60. The first annular cavity 611 at the first bearing group 20 is formed by the shaft head 61 and the outer circumference of the main shaft 60.

[0035] Similarly, referring to Figure 4 , the first oil retaining ring 22 of the third bearing group 40 extends upward into the first annular cavity 611 located at the third bearing group 40.

[0036] When the main shaft 60 rotates rapidly, in order to prevent the lubricating oil in the first oil chamber 29 from splashing, referring to Figure 5 , a first upper cover 28 is installed on the first bearing seat 21. At the same time, a first oil inlet pipe 281 and a first oil return pipe 282 are installed on the first upper cover 28. During the test, lubricating oil is injected into the first oil chamber 29 through the first oil inlet pipe 281, and the lubricating oil is drawn out through the first oil return pipe 282, thereby simulating the circulating lubrication environment under real conditions. The number of the first oil inlet pipe 281 and the first oil return pipe 282 can be one or more. In this embodiment, the number of the first oil inlet pipe 281 is 2, and the number of the first oil return pipe 282 is 2.

[0037] The depths of the first oil inlet pipe 281 and the first oil return pipe 282 inserted into the first oil chamber 29 are adjustable, and 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 replaced and adjusted with each other. The first oil inlet pipe 281 and the first oil return pipe 282 are connected to an external oil circulation cooling device. The oil in the oil tank is circulated and cooled through the oil circulation cooling device to prevent the oil temperature from being too high. By adjusting the arrangement mode of the first oil inlet pipe 281 and the first oil return pipe 282 on the first upper cover 28 and the depths inserted into the first oil chamber 29, the adjustment of the circulating oil path can be realized to meet the personalized requirements for the circulating oil path during different fault simulation tests.

[0038] Further, in order to facilitate measuring the temperature of the first bearing bush 24 and the temperature of the lubricating oil in the first oil cavity 29 during the simulation test, 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, and the second temperature sensor 212 extends into the first oil cavity 29.

[0039] Specifically, the first temperature sensor 241 and the second temperature sensor 212 can adopt pt100 platinum thermal resistance temperature sensors. An installation hole is provided on the outer side of the first bearing bush 24, the probe of the pt100 platinum thermal resistance temperature sensor is buried in the installation hole of the first bearing bush 24, and the cable of the first temperature sensor 241 passes through the outer wall of the first bearing housing 21 in a sealed manner.

[0040] Embodiment 2: On the basis of Embodiment 1, the second bearing group 30 includes a second bearing housing 31, a ring seat 32, a thrust bearing bush 34, a friction ring 35, a second bearing bush 36, and a second adjustment device. The second bearing housing 31 is installed on the second platform 12, the ring seat 32 is installed at the bottom of the second bearing housing 31, a plurality of installation grooves are provided on the upper side of the ring seat 32 around the main shaft 60, and the thrust bearing bush 34 is installed in the installation 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 bush 34. A height adjustment screw 321 is screwed on the ring seat 32 at a position corresponding to the thrust bearing bush 34, and the height adjustment screw 321 supports the lower side of the thrust bearing bush 34; a plurality of second bearing bushes 36 are installed in the second bearing housing 31 to slide radially around the main shaft 60, and second adjustment devices are respectively installed on the second bearing housing 31 at positions corresponding to the second bearing bushes 36, and the second adjustment device is 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.

[0041] In this embodiment, the thrust bearing bush 34 is used to simulate the thrust bearing bush of a real vertical water turbine generator set, and the friction ring 35 is used to simulate the mirror plate of a real vertical water turbine generator set. The gap between the second bearing bush 36 and the main shaft 60 is adjusted by the second adjustment device, so as to simulate the bearing rubbing, uneven bearing clearance, too large / small bearing clearance, and loose bearing support faults of the lower guide bearing of the vertical water turbine generator set. And by adjusting the height adjustment screw 321, it can also be used to simulate the unqualified horizontal and loose support faults of the thrust bearing of the vertical water turbine generator set.

[0042] In this embodiment, refer to Figure 5-8 , both the first adjustment device and the second adjustment device include an adjustment push rod 25 and two adjustment pull rods 26.

[0043] Among them, refer to 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 housing 21. When the adjusting push rod 25 is rotated to move inward, the adjusting push rod 25 pushes the first bearing bush 24 inward. When the adjusting push rod 25 is rotated to move outward, the adjusting push rod 25 separates from the first bearing bush 24. The two adjusting pull rods 26 of the first adjusting device are respectively located on both sides of the adjusting push rod 25. One end of the adjusting pull rod 26 is axially limitedly connected to the first bearing bush 24, that is, the adjusting pull rod 26 can rotate, but no axial displacement can occur between the adjusting pull rod 26 and the first bearing bush 24. The other end of the adjusting pull rod 26 is threadedly connected to the first bearing housing 21. When the adjusting pull rod 26 is rotated to move outward, the adjusting pull rod 26 pulls the first bearing bush 24 outward. When the adjusting pull rod 26 is rotated to move inward, the adjusting pull rod 26 separates from the first bearing bush 24.

[0044] 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 housing 31. When the adjusting push rod 25 is rotated to move inward, the adjusting push rod 25 pushes the second bearing bush 36 inward. When the adjusting push rod 25 is rotated to move outward, the adjusting push rod 25 separates from the second bearing bush 36. The two adjusting pull rods 26 of the second adjusting device are respectively located on both sides of the adjusting push rod 25. One end of the adjusting pull rod 26 is axially limitedly connected to the second bearing bush 36, that is, the adjusting pull rod 26 can rotate, but no axial displacement can occur between the adjusting pull rod 26 and the first bearing bush 24. The other end of the adjusting pull rod 26 is threadedly connected to the second bearing housing 31. When the adjusting pull rod 26 is rotated to move outward, the adjusting pull rod 26 pulls the second bearing bush 36 outward. When the adjusting pull rod 26 is rotated to move inward, the adjusting pull rod 26 separates from the second bearing bush 36.

[0045] In one of the solutions, a T-shaped rod head is provided at the end of each adjusting pull rod 26, and T-shaped grooves are provided on the first bearing bush 24 and the second bearing bush 36. The T-shaped rod head is inserted into the T-shaped groove. The width of the T-shaped rod head is smaller than the depth of the T-shaped groove. The T-shaped rod head can move axially along the adjusting pull rod 26 in the T-shaped groove. When the adjusting pull rod 26 is pulled outward, the first bearing bush 24 and the second bearing bush 36 can be pulled outward. When the adjusting pull rod 26 is pushed inward, the T-shaped rod head can move in the gap of the T-shaped groove, and the first bearing bush 24 and the second bearing bush 36 are not driven to move inward. Through the mutual cooperation of the adjusting push rod 25 and the adjusting pull rod 26, the positions of the first bearing bush 24 and the second bearing bush 36 are adjusted.

[0046] Furthermore, see Figure 6, a second oil retaining ring 33 is installed in the inner hole of the ring seat 32. A second annular cavity 63 is provided inside the flange 62 of the main shaft 60. The second oil retaining ring 33 extends upward into the second annular cavity 63. A second oil chamber 39 is formed between the second bearing seat 31 and the second oil retaining ring 33. During the test, oil is injected into the second oil chamber 39 to further simulate the lubrication environment of the second bearing bush 36.

[0047] The outer surface of the second oil retaining ring 33 is provided with a reverse spiral groove. The reverse spiral groove can play the role of a self-priming pump when the main shaft rotates, making the oil in the spiral groove tend to flow downward and preventing the oil from overflowing from the top of the second oil retaining ring 33 during movement.

[0048] When the main shaft 60 rotates rapidly, in order to prevent the lubricating oil in the second oil chamber 39 from splashing, see Figure 6 , a second upper cover 38 is installed on the second bearing seat 31.

[0049] Furthermore, a second inlet pipe 381 and a second 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 inlet pipe 381, and the lubricating oil is drawn out through the second return pipe 382, so as to simulate the circulating lubrication environment in the real state. The number of the second inlet pipe 381 and the second return pipe 382 can be one or more. In this embodiment, the number of the second inlet pipes 381 is 2, and the number of the second return pipes 382 is 2.

[0050] The depths of the second inlet pipe 381 and the second return pipe 382 inserted into the second oil chamber 39 are adjustable. The second inlet pipe 381 and the second return pipe 382 are connected to an external oil circulation cooling device. The oil in the oil tank is circulated and cooled through the oil circulation cooling device to prevent the oil temperature from being too high. By adjusting the arrangement mode of the second inlet pipe 381 and the second return pipe 382 on the second upper cover 38 and the depths inserted into the second oil chamber 39, the adjustment of the circulating oil path can be realized to meet the personalized requirements for the circulating oil path during different fault simulation tests.

[0051] Furthermore, a third temperature sensor 361 is installed on the second bearing bush 36 to facilitate measuring the temperature of the second bearing bush 36 during the simulation test. At the same time, a fourth temperature sensor 312 is installed on the second bearing seat 31. The fourth temperature sensor 312 extends into the second oil chamber 39 to facilitate measuring the temperature of the lubricating oil in the second oil chamber 39. Specifically, the third temperature sensor 361 and the fourth temperature sensor 312 can adopt pt100 platinum thermal resistance temperature sensors. The installation method of the third temperature sensor 361 is the same as that of the first temperature sensor 241.

[0052] Furthermore, see Figure 5 、 7, To improve the stability of the first bearing bush 24, a first pressing seat 23 is installed at the position corresponding to the first bearing bush 24 in the first bearing housing 21. The first pressing seat 23 is Z-shaped. The upper end of the first pressing seat 23 presses on the upper side of the first bearing bush 24. While ensuring that the first bearing bush 24 does not move up and down, the first pressing seat 23 can also move radially. Further, a first guiding column 211 is provided at the position corresponding to the first bearing bush 24 in the first bearing housing 21. The first guiding column 211 extends upward into the first long 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.

[0053] Similarly, referring to Figure 6 、 8 , To improve the stability of the second bearing bush 36, a second pressing seat 311 is installed at the position corresponding to the second bearing bush 36 in the second bearing housing 31. The second pressing seat 311 is Z-shaped. The upper end of the second pressing seat 311 presses on the upper side of the second bearing bush 36. While ensuring that the second bearing bush 36 does not move up and down, the second pressing seat 311 can also move radially. Further, a second guiding column 313 is provided at the position corresponding to the second bearing bush 36 in the second bearing housing 31. The second guiding column 313 extends upward into the second long hole 362 on the lower side of the second bearing bush 36, thereby guiding and limiting the second bearing bush 36 and improving the installation stability of the first bearing bush 24.

[0054] Further, referring to Figure 1 、 2 , A rubbing rod 80 is also installed on the frame 10. By rubbing the outer circumference of the rotor 70 with the rubbing rod 80, the rotor 70 is used to simulate the rotor of a vertical hydro-generating unit, so that it can be used to simulate the rubbing fault of the rotor of a vertical hydro-generating unit.

[0055] Embodiment 3: Based on Embodiment 1, referring to Figure 5 、 7 , Using the test method of the bearing system simulation test device for vertical hydro-generating units to simulate the bearing rubbing, uneven bearing clearances, too large / small bearing clearances, and loose bearing bush supports of the upper guide bearing and water guide bearing of a vertical hydro-generating unit. The steps of the test method are as follows: Adjust the clearance between the first bearing bush 24 and the main shaft 60 in the first bearing group 20 and / or the third bearing group 40 through the first adjustment device; When the clearance between the first bearing bush 24 and the main shaft 60 is too small to form a lubricating oil film, at this time, the working surfaces of the first bearing bush 24 and the main shaft 60 are in non-liquid lubrication friction, which is used to simulate the bearing rubbing fault; When the clearances between the first bearing bushes 24 and the main shaft 60 are uneven, it is used to simulate the uneven bearing clearance 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 the bearing clearance being too large / small fault; When the first adjusting device is loose, it is used to simulate the bearing bush support loose fault; Start the driver 50 to drive the main shaft 60 to rotate, and successively collect the swing, vibration, acceleration and noise of the bearing system under the above different fault modes through the monitoring equipment.

[0056] During the simulation test, by monitoring the state of the vertical hydro-generator bearing system simulation test device under different faults, including the swing, vibration, acceleration, oil temperature and noise state of the bearing system, it is used to analyze the faults of the hydro-generator bearing system in actual situations, and provide data support for the research and prediction of the faults of the vertical hydro-generator bearing system.

[0057] Embodiment 4: On the basis of Embodiment 2, adopt the test method of the vertical hydro-generator bearing system simulation test device to simulate the bearing rubbing, uneven bearing clearance, too large / small bearing clearance and bearing bush support loose faults of the lower guide bearing of the vertical hydro-generator, as well as the horizontal unqualified and support loose faults of the thrust bearing. The test steps are as follows: Adjust the clearance between the second bearing bush 36 in the second bearing group 30 and the main shaft 60 through the second adjusting device; When the clearance between the second bearing bush 36 and the main shaft 60 is too small to form a lubricating oil film, at this time, the working surface of the second bearing bush 36 and the working surface of the main shaft 60 are in non-liquid lubrication friction, which is used to simulate the bearing rubbing fault of the lower guide bearing; When the clearances between the second bearing bushes 36 and the main shaft 60 are uneven, it is used to simulate the uneven bearing clearance 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 too large / small bearing clearance fault of the lower guide bearing; When the second adjusting device is loose, it is used to simulate the bearing bush support loose fault of the lower guide bearing; Rotate and adjust the height adjusting screw 321 to adjust the height of each thrust bearing pad 34; When the heights of the thrust bearing pads 34 are not on the same horizontal plane, it is used to simulate the horizontal unqualified fault of the thrust bearing; When the height adjusting screw 321 is loose, it is used to simulate the support loose fault of the thrust bearing; Start the driver 50 to drive the main shaft 60 to rotate, and successively collect the swing, vibration, acceleration and noise of the bearing system under the above different fault modes through the monitoring equipment.

[0058] Similarly, during the simulation test, by monitoring the state of the bearing system simulation test device of the vertical hydro-generator unit under different faults, including the swing, vibration, acceleration, oil temperature, and noise state of the bearing system, it is used to analyze the faults of the bearing system of the hydro-generator unit in actual situations, providing data support for the research and prediction of the faults of the bearing system of the vertical hydro-generator unit.

Claims

1. A simulation test device for the bearing system of a vertical water turbine generator set, characterized in that: It includes a frame (10), a first bearing group (20), a second bearing group (30), a third bearing group (40), a driver (50), a main shaft (60) and a rotor (70). The frame (10) is successively 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 group (20) is installed on the first platform (11), the second bearing group (30) is installed on the second platform (12), the third bearing group (40) is installed on the third platform (13), the driver (50) is installed on the fourth platform (14), the main shaft (60) is longitudinally installed on the first bearing group (20), the second bearing group (30) and the third bearing group (40), and the main shaft (60) is movably and adjustably docked with the output shaft of the driver (50). Both the first bearing group (20) and the third bearing group (40) include a first bearing seat (21), a first bearing bush (24) and a first adjusting device. The two first bearing seats (21) are respectively installed on the first platform (11) and the third platform (13). Inside the first bearing seat (21), a plurality of first bearing bushes (24) are installed to slide radially around the main shaft (60). At positions corresponding to each of the first bearing bushes (24) on the first bearing seat (21), first adjusting devices are respectively installed. The first adjusting 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).

2. The vertical hydro-generator unit bearing system simulation test device according to claim 1, characterized in that: At positions of the main shaft (60) where the first bearing group (20) and the third bearing group (40) are located, first annular cavities (611) with open lower sides are respectively provided. The inner hole of the first bearing seat (21) is installed 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 bushes (24) surround the outer wall of the main shaft (60). The outer surface of the first oil baffle ring (22) is provided with reverse spiral grooves.

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 seat (21). A first oil inlet pipe (281) and a first oil return pipe (282) are installed on the first upper cover (28). The depths of insertion of the first oil inlet pipe (281) and the first oil return pipe (282) into the first oil cavity (29) are 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 replaced and adjusted with each other.

4. The simulated test device for the bearing system of a vertical water turbine generator set according to claim 3, wherein: A first temperature sensor (241) is installed on the first bearing bush (24). A second temperature sensor (212) is installed on the first bearing seat (21). The second temperature sensor (212) extends into the first oil cavity (29).

5. The vertical hydro-generator unit bearing system simulation test device according to claim 1, characterized in that: The second bearing group (30) includes a second bearing housing (31), a ring seat (32), thrust pads (34), friction rings (35), second bearing bushes (36), and a second adjustment device. The second bearing housing (31) is installed on the second platform (12). The ring seat (32) is installed at the bottom of the second bearing housing (31). A plurality of mounting grooves are provided on the upper side of the ring seat (32) around the main shaft (60), and thrust pads (34) are 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 pads (34). A height adjustment screw (321) is screwed at a position corresponding to the thrust pad (34) on the ring seat (32), and the height adjustment screw (321) supports the lower side of the thrust pad (34). A plurality of second bearing bushes (36) are installed in the second bearing housing (31) to slide radially around the main shaft (60). Second adjustment devices are respectively installed on the second bearing housing (31) at positions corresponding to the second bearing bushes (36), and the second adjustment devices are used to adjust the gap between the second bearing bushes (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).

6. The vertical hydro-generator unit bearing system simulation test device according to claim 5, wherein: Both the first adjustment device and the second adjustment device include an adjustment push rod (25) and two adjustment pull rods (26). Among them, one end of the adjustment push rod (25) of the first adjustment device abuts against the first bearing bush (24), and the other end is screwed and connected with the first bearing housing (21). The two adjustment pull rods (26) of the first adjustment device are respectively located on both sides of the adjustment push rod (25). One end of the adjustment pull rod (26) is axially and limit-connected to the first bearing bush (24), and the other end is screwed and connected with the first bearing housing (21). One end of the adjustment push rod (25) of the second adjustment device abuts against the second bearing bush (36), and the other end is screwed and connected with the second bearing housing (31). The two adjustment pull rods (26) of the second adjustment device are respectively located on both sides of the adjustment push rod (25). One end of the adjustment pull rod (26) is axially and limit-connected to the second bearing bush (36), and the other end is screwed and connected with the second bearing housing (31).

7. The vertical hydro-generator unit bearing system simulation test device according to claim 5, characterized in that: A second oil baffle ring (33) is installed in the inner hole of the ring seat (32). A second ring cavity (63) with an open lower side is provided on the inner side of the main shaft (60) at the position of the flange (62). The second oil baffle ring (33) extends upward into the second ring cavity (63), and a second oil cavity (39) is formed between the second bearing housing (31) and the second oil baffle ring (33). A reverse spiral groove is provided on the outer surface of the second oil baffle ring (33).

8. The vertical water turbine generator set bearing system simulation test device according to claim 7, characterized in that: A second upper cover (38) is mounted on the second bearing block (31). A second oil inlet pipe (381) and a second oil return pipe (382) are mounted on the second upper cover (38). The depths to which the second oil inlet pipe (381) and the second oil return pipe (382) are inserted into the second oil cavity (39) are adjustable. The mounting positions of the second oil inlet pipe (381) and the second oil return pipe (382) on the second upper cover (38) can be replaced and adjusted with each other. A third temperature sensor (361) is mounted on the second bearing bush (36), and a fourth temperature sensor (312) is mounted on the second bearing block (31). The fourth temperature sensor (312) extends into the second oil cavity (39).

9. The test method of the vertical hydro-generator unit bearing system simulation test device according to any one of claims 1-4, characterized in that: To simulate the bearing rubbing, uneven bearing clearances, too large / small bearing clearances, and loose bearing bush support faults of the upper guide bearing and the water guide bearing of a vertical water turbine generator set, the test method steps are as follows: Adjust the clearance between the first bearing bush (24) and the main shaft (60) in the first bearing group (20) and / or the third bearing group (40) through the first adjustment device; When the clearance between the first bearing bush (24) and the main shaft (60) is too small to form a lubricating oil film, at this time, the working surfaces of the first bearing bush (24) and the main shaft (60) are in non-liquid lubrication friction, which is used to simulate the bearing rubbing fault; When the clearances between the first bearing bushes (24) and the main shaft (60) are uneven, it is used to simulate the uneven bearing clearance 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 the too large / too small bearing clearance fault; When the first adjustment device is loose, it is used to simulate the loose bearing bush support fault; Start the driver (50) to drive the main shaft (60) to rotate, and sequentially collect the swing, vibration, acceleration, and noise of the bearing system under the above different fault modes through the monitoring equipment.

10. The test method of the vertical hydro-generator unit bearing system simulation test device according to any one of claims 5-8, characterized in that: To simulate the bearing rubbing, uneven bearing clearances, too large / small bearing clearances, and loose bearing bush support faults of the lower guide bearing of a vertical water turbine generator set, as well as the horizontal non-compliance and loose support faults of the thrust bearing, the test method steps are as follows: Adjust the clearance between the second bearing bush (36) and the main shaft (60) in the second bearing group (30) through the second adjustment device; When the clearance between the second bearing bush (36) and the main shaft (60) is too small to form a lubricating oil film, at this time, the working surfaces of the second bearing bush (36) and the main shaft (60) are in non-liquid lubrication friction, which is used to simulate the bearing rubbing fault of the lower guide bearing; When the clearances between the second bearing bushes (36) and the main shaft (60) are uneven, it is used to simulate the uneven bearing clearance 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 too large / too small bearing clearance fault of the lower guide bearing; When the second adjustment device is loose, it is used to simulate the loose bearing bush support fault of the lower guide bearing; Adjust the height of each thrust bearing pad (34) by rotating and adjusting the height adjustment screw (321); When the heights of the thrust bearing pads (34) are not on the same horizontal plane, it is used to simulate the horizontal non-compliance fault of the thrust bearing; When the height adjustment screw (321) is loose, it is used to simulate the looseness fault of the thrust bearing support; Start the driver (50) to drive the main shaft (60) to rotate, and sequentially collect the swing, vibration, acceleration, and noise of the bearing system under the above different fault modes through the monitoring equipment.

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