CN103471824B - A kind of turbine rotor spin stand platform and method - Google Patents
A kind of turbine rotor spin stand platform and method Download PDFInfo
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- CN103471824B CN103471824B CN201310383831.7A CN201310383831A CN103471824B CN 103471824 B CN103471824 B CN 103471824B CN 201310383831 A CN201310383831 A CN 201310383831A CN 103471824 B CN103471824 B CN 103471824B
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Abstract
The invention provides a kind of turbine rotor spin stand platform and method, including being arranged on the bearing of test rotor both sides and providing the device of rotary power to test rotor；Described bearing sets up an outer race at the cylindrical that bearing liner overlaps, have in gap, this gap and a pair cyclic spring potted component is set between bearing liner set and outer race, constitute an oil closed cavity, oil closed cavity is connected with lubrication oil supply system by oil line pipe, and in oil closed cavity, the change of oil pressure makes the support stiffness of bearing adjustable.The turbine rotor spin stand platform of the present invention and method, by adjusting support span and the support stiffness of rotor to be tested flexibly, make the test rotor can the different critical speed of self adaptation, this test platform is made to can adapt to the requirement that wider test speed is interval, strengthen its versatility, effectively reduce experimentation cost, this spin stand platform and method safety are reliable, simple to operation simultaneously, are beneficial to large-scale use and popularization.
Description
Technical field
The present invention relates to steam turbine field, specifically a kind of turbine rotor spin stand platform and method.
Background technology
Along with the development of industrial technology, the kind of rotating machinery gets more and more, and the design of many rotating machinery parts is required for tried checking, such as turbine rotor.Any rotating machinery has the critical speed of oneself, at work in order to avoid resonance, its working speed must avoid critical speed, but for Rotating Machinery Experiment platform, its rotating speed is determined by testing parts, this just requires that test platform allows for adapting to the test requirements document that various rotating speed is interval, but a kind of test turns critical speed of shaft and might not avoid test speed interval, and design iterations can cause again the rising of experimentation cost.If able to design the test platform that a kind of turbine rotor is special so that it is the test of the rotating machinery parts of different rotating speeds can be applicable to, it becomes possible to be substantially reduced the experimentation cost of rotary part.
Summary of the invention
It is an object of the invention to: a kind of turbine rotor spin stand platform and method are provided, it is possible to make test rotor can self adaptation is different in rotation test critical speed, safe and reliable, cost is substantially reduced.
The technical solution adopted in the present invention is:
A kind of turbine rotor spin stand platform, uses rotor stay-bolt to be connected as one by test impeller and couples test rotating shaft in its both sides, constituting test rotor；Described spin stand platform includes the bearing being arranged on test rotor both sides and the device providing rotary power to test rotor；Described bearing sets up an outer race at the cylindrical that bearing liner overlaps, have in gap, this gap and a pair cyclic spring potted component is set between bearing liner set and outer race, constitute an oil closed cavity, oil closed cavity is connected with lubrication oil supply system by oil line pipe, and in oil closed cavity, the change of oil pressure makes the support stiffness of bearing adjustable.
The adjustable axial dimension by test rotor of support span between described bearing is determined, concrete: to determine quantity and the thickness of test impeller according to test requirements document, or increase auxiliary wheel disc on rotor stay-bolt.
Described bearing is tilting pad sliding bearing, oval sliding bearing or rolling bearing.
Described turbine rotor rotation test method, comprises the following steps:
(1) determine quantity and the thickness of test impeller according to test requirements document, whether increase auxiliary wheel disc, it is determined that the support span of bearing and test turn critical speed of shaft and adapt；
(2) use rotor stay-bolt to be connected as one by test impeller and couple test rotating shaft in its both sides, constituting test rotor；
(3) with a pair support stiffness adjustable bearing supporting test rotor both sides, the oil pressure size in oil closed cavity is regulated by lubrication oil supply system so that the support stiffness of this bearing and test turn critical speed of shaft and adapt；
(4) power is provided for test rotor, makes it rotate under working speed, start the rotation test of turbine rotor, in process of the test:
If the close test of working speed a. testing rotor turns critical speed of shaft, regulate the oil pressure in oil closed cavity by lubrication oil supply system to increase, make test turn critical speed of shaft to increase, so that the working speed of test rotor is unlikely to approach test and turns critical speed of shaft；
If b. test turn critical speed of shaft excessive time, regulate the oil pressure in oil closed cavity by lubrication oil supply system and reduce so that test turns critical speed of shaft and reduces, simultaneously it is noted that the working speed of test rotor can not be made to approach test turn critical speed of shaft.
The invention have the advantages that:
The turbine rotor spin stand platform of the present invention and method, by adjusting support span and the support stiffness of rotor to be tested flexibly, make the test rotor can the different critical speed of self adaptation, this test platform is made to can adapt to the requirement that wider test speed is interval, strengthen its versatility, effectively reduce experimentation cost, this spin stand platform and method safety are reliable, simple to operation simultaneously, are beneficial to large-scale use and popularization.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first embodiment of test platform of the present invention；
Fig. 2 is the structural representation of the second embodiment of test platform of the present invention；
Fig. 3 is the structural representation of the third embodiment of test platform of the present invention；
Fig. 4 be the adjustable radial journal bearing of rigidity of the present invention the structural representation of the first embodiment；
Fig. 5 is the principle schematic of bearing film damping；
Fig. 6 be the adjustable radial journal bearing of rigidity of the present invention the structural representation of the second embodiment；
Fig. 7 be the adjustable radial journal bearing of rigidity of the present invention the structural representation of the third embodiment；
Number in the figure represents: test rotating shaft, 2-front support bearing, 3-rotor stay-bolt before 1-, 4-tests impeller, 5-tests impeller, 6-tests rotating shaft after testing impeller, 7-rear support bearing, 8-, 9-power set, 10-assist wheel disc, 11-outer race, 12-elastic sealing elements, 13-bearing liner set, 14-tilting pad, 15-extreme pressure lubricant, 16-oil supply system, 17-bearing, 18-damping spring.
Detailed description of the invention
As shown in Fig. 1～7, the present invention is a kind of turbine rotor spin stand platform.
First, use rotor stay-bolt 3 to be connected as one by test impeller and couple test rotating shaft in its both sides, constituting test rotor.Concrete: test impeller 4, test impeller 5 and test impeller 6 are connected as one by rotor stay-bolt 3, and before its both sides couple respectively, tests rotating shaft 1 and rear test rotating shaft 8, so as to constitute steam turbine test rotor.
Turbine rotor spin stand platform includes supporting arrangement and power set 9.Supporting arrangement is provided in the adjustable bearing of a pair support stiffness of test rotor both sides (front test rotating shaft 1 and rear test rotating shaft 8 axle journal place), and power set 9 are the rotation operating modes providing the device of rotary power, simulation test impeller and test rotating shaft to test rotor.
The cylindrical that the adjustable bearing of this support stiffness (i.e. front support bearing 2 and rear support bearing 7) overlaps 13 at bearing liner sets up an outer race 11, have in gap, this gap and a pair cyclic spring potted component 12 is set between bearing liner set 13 and outer race 11, constitute an adjustable oil closed cavity of thickness, oil closed cavity is connected with lubrication oil supply system 16 by oil line pipe, and in oil closed cavity, the change of oil pressure makes the support stiffness of bearing adjustable.
Meanwhile, the support span between this bearing (i.e. front support bearing 2 and rear support bearing 7) is adjustable, determines particular by by the axial dimension of test rotor.According to the quantity of test requirements document Adjustment Tests impeller and thickness, or auxiliary wheel disc 10 can be increased on rotor stay-bolt 3.
Concrete, the adjustable bearing of this support stiffness can be tilting pad sliding bearing, oval sliding bearing or rolling bearing.
Turbine rotor rotation test method of the present invention, comprises the following steps:
(1) determine quantity and the thickness (axial dimension) of test impeller according to test requirements document, whether on rotor stay-bolt 3, increase auxiliary wheel disc 10, it is determined that the support span of bearing and test turn critical speed of shaft and adapt；
(2) use rotor stay-bolt 3 to be connected as one by test impeller, if adding auxiliary wheel disc 10, also auxiliary wheel disc 10 being connected to the side of test impeller, and before its both sides couple respectively, test rotating shaft 1 and rear test rotating shaft 8, constitute test rotor；
(3) with a pair support stiffness adjustable bearing supporting test rotor both sides, the oil pressure size in oil closed cavity is regulated by lubrication oil supply system 16 so that the support stiffness of this bearing and test turn critical speed of shaft and adapt；
(4) device 9 that turns on the power provides power for test rotor, makes test rotor rotate under working speed, starts the rotation test of turbine rotor, in process of the test:
If the close test of working speed a. testing rotor turns critical speed of shaft, regulate the oil pressure in oil closed cavity by lubrication oil supply system 16 to increase, make test turn critical speed of shaft to increase, so that the working speed of test rotor is unlikely to approach test and turns critical speed of shaft；
If b. test turn critical speed of shaft excessive time, regulate the oil pressure in oil closed cavity by lubrication oil supply system 16 to reduce, make test turn critical speed of shaft to reduce, simultaneously it is noted that the working speed of test rotor can not be made to approach test turn critical speed of shaft.
So operation so that test rotor, when different working speeds, regulates test in real time and turns critical speed of shaft so that working speed avoids critical speed, it is to avoid the situation of resonant vibration of shafting.
For any one rotating machinery, in order to avoid the resonance of axle system, in shafting design process, must assure that the working speed of the critical speed of axle system and axle system avoids certain scope.According to Balancing of Steam Turbine Shaft Guidance Rule, the critical speed of steam-electric generating set shafting must avoid the scope of working speed 10%, namely the critical speed of shaft system of unit is necessarily less than 2700rpm or more than 3300rpm, is then underproof within the scope of 2700rpm～3300rpm.
The critical speed of rotating machinery shaft system depends on the quality m and rigidity k of self, quality refers to the quality of rotary axis self, rigidity is then the rigidity of structure support stiffness with spring bearing of spindle system self, the rigidity of structure wherein testing rotor depends primarily on the support span of radial journal bearing, and support stiffness is then mainly determined by bearing.
The turbine rotor Rotating Machinery Experiment platform of the present invention, the span of its test rotor can adjust flexibly according to test requirements document, and the support stiffness of radial journal bearing can need arbitrarily change according to test.Therefore, the requirement according to actual tests: before the test by changing quantity and the thickness (axial dimension) of test impeller, if increase auxiliary wheel disc 10 on rotor stay-bolt 3, thus the span by test rotor adjusts a rational scope；In process of the test, regulated the thickness of film damper in real time by lubrication oil supply system 16, so that the support stiffness flexible of rotor, it is ensured that the critical speed of test rotor avoids certain safety range with experiment work rotating speed.
Fig. 1 is a kind of test platform not needing power set 9, and other medium that the rotation of its rotor is entirely through in test provides (such as high velocity air), main analog testpieces operating mode in real work.
Fig. 2 provides the test platform of rotary power, main analog rotating parts intensity operating mode under working speed for requiring over motor.Wherein
Fig. 1, in 2, before test, it is possible to according to actual test requirements document and test objective, the quantity of Adjustment Tests impeller 4, test impeller 5 and test impeller 6 and thickness (axial dimension), and registration rotor stay-bolt 3, thus adjust the support span of front test rotating shaft 1 and rear test rotating shaft 8.
If actual tests needs to do the test of three grades of impellers, but finds that its critical speed and experiment work rotating ratio are closer to, and have the risk of resonance in process of the test the test rotor after tight three grades of impellers 4,5 and 6 by calculating.At this moment, it is possible to strengthen the span L of test rotating shaft by increasing the form of an auxiliary wheel disc 10, reduce test and turn critical speed of shaft, and then the critical speed of guarantee test rotor avoids certain safety range with test speed, as shown in Figure 3.
The method of the support span of Adjustment Tests rotor is also multiple, namely changes the axial dimension of test rotor.
Except changing test by the span of Adjustment Tests rotor and turning critical speed of shaft, in process of the test, it is also possible to carry out the support rigidity of Adjustment Tests rotor by adjusting the support stiffness of bearing, and then Adjustment Tests platform turns critical speed of shaft.The method that the present invention adopts is to overlap the cylindrical of 13 at bearing liner to set up an outer race 11 and the adjustable oil closed cavity of thickness, concrete:
As shown in Figure 4, being the adjustable tilting pad sliding bearing of support stiffness, bearing liner set 13 and tilting pad 14 form the basic structure of tradition tilting pad sliding bearing, overlap at bearing liner simultaneously and arrange a pair cyclic spring potted component 12 on 13 cylindricals.This cyclic spring potted component 12 has certain elasticity, and can seal extreme pressure lubricant 15.Overlapped in the chamber closed between 13 and outer race 11 and a pair cyclic spring potted component 12 by bearing liner and be filled with extreme pressure lubricant 15.This extreme pressure lubricant 15 is communicated with outside extreme pressure lubricant oil supply system 16 by the oil line pipe (i.e. grease channel) in outer race 11, and the lubrication pressure in oil closed cavity can pass through extreme pressure lubricant oil supply system 16 and automatically and flexibly regulate.
In process of the test, if needing to increase the critical speed of test rotor, then can being realized by the pressure of lubricating oil in increase oil closed cavity, the pressure of lubricating oil increases, and the support stiffness of test rotor will necessarily increase, and its critical speed also can increase accordingly；If the pressure of lubricating oil reduces in contrary oil closed cavity, then the support stiffness of rotor will necessarily reduce, and the critical speed of test rotor also can reduce accordingly.So, according to concrete test situation, by the support stiffness of extreme pressure lubricant oil supply system 16 Adjustment Tests platform radial journal bearing neatly, and then increasing or reduce the critical speed of test rotor flexibly, it is ensured that the critical speed of rotor and working speed avoid certain safety range.
In normal working conditions, elastic sealing elements 12 and its extreme pressure lubricant sealed are exactly a film damper, and functioning as of this film damper adds a damping spring 18 to radial journal bearing 17, as shown in Figure 5.This damping spring 18 is except can except the support stiffness of Adjustment Tests rotor, it is also possible to effectively absorbing the energy of axle system bending vibration, decay bending vibration is delivered to the energy on basis, it is possible to effectively reduce the noise of this test platform and the vibration on basis.
The radial journal bearing of test platform is except tilting bush sliding bearing, it is also possible to adopt oval sliding bearing or rolling bearing, and its structure increasing high-tension lubrication oil-in chamber is similar to tilting bush sliding bearing, as shown in Figure 6, Figure 7.
Claims (3)
1. a turbine rotor spin stand platform, uses rotor stay-bolt to be connected as one by test impeller and couples test rotating shaft in its both sides, constituting test rotor；Described spin stand platform includes the bearing being arranged on test rotor both sides and the device providing rotary power to test rotor；It is characterized in that, support span between described bearing is adjustable, determines by testing the axial dimension of rotor, concrete: determine quantity and the thickness of test impeller according to test requirements document, or on rotor stay-bolt, increase auxiliary wheel disc, determine the rigidity of structure of test rotor；Described bearing sets up an outer race at the cylindrical that bearing liner overlaps, have in gap, this gap and a pair cyclic spring potted component is set between bearing liner set and outer race, constitute an oil closed cavity, oil closed cavity is connected with lubrication oil supply system by oil line pipe, elastic sealing elements and its extreme pressure lubricant sealed are exactly a film damper, be equivalent to add a damping spring to bearing, in oil closed cavity, the change of oil pressure makes the support stiffness of bearing adjustable, determines the support stiffness of test rotor.
2. turbine rotor spin stand platform according to claim 1, it is characterised in that described bearing is tilting pad sliding bearing, oval sliding bearing or rolling bearing.
3. the test method of turbine rotor spin stand platform according to claim 1 and 2, it is characterised in that comprise the following steps:
(1) determine quantity and the thickness of test impeller according to test requirements document, whether increase auxiliary wheel disc, it is determined that the support span of bearing and test turn critical speed of shaft and adapt；
(2) use rotor stay-bolt to be connected as one by test impeller and couple test rotating shaft in its both sides, constituting test rotor；
(3) with a pair support stiffness adjustable bearing supporting test rotor both sides, the oil pressure size in oil closed cavity is regulated by lubrication oil supply system so that the support stiffness of this bearing and test turn critical speed of shaft and adapt；
(4) power is provided for test rotor, makes it rotate under working speed, start the rotation test of turbine rotor, in process of the test:
If the close test of working speed a. testing rotor turns critical speed of shaft, regulate the oil pressure in oil closed cavity by lubrication oil supply system to increase, make test turn critical speed of shaft to increase, so that the working speed of test rotor is unlikely to approach test and turns critical speed of shaft；
If b. test turn critical speed of shaft excessive time, regulate the oil pressure in oil closed cavity by lubrication oil supply system and reduce so that test turns critical speed of shaft and reduces, simultaneously it is noted that the working speed of test rotor can not be made to approach test turn critical speed of shaft；
So operation so that test rotor, when different working speeds, regulates test in real time and turns critical speed of shaft so that working speed avoids critical speed, it is to avoid the situation of resonant vibration of shafting.
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| CN201310383831.7A CN103471824B (en) | 2013-08-29 | 2013-08-29 | A kind of turbine rotor spin stand platform and method |
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| CN103471824B true CN103471824B (en) | 2016-06-29 |
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| CN103821567B (en) * | 2014-01-23 | 2015-11-18 | 西北工业大学 | A kind of aircraft engine high pressure rotor Structural Design |
| CN104568454B (en) * | 2015-01-30 | 2017-09-29 | 武汉船用机械有限责任公司 | A kind of turbine test platform peculiar to vessel |
| CN105806622A (en) * | 2016-05-26 | 2016-07-27 | 沈阳工程学院 | Experimental method for measuring critical speed influencing factors for steam turbine rotor |
| CN106768935B (en) * | 2016-12-06 | 2018-12-21 | 郑州轻工业学院 | Rotor testbed with flexible support |
| CN108035775A (en) * | 2018-01-08 | 2018-05-15 | 翁志远 | Rotor, steam turbine and prime mover equipment of steam turbine |
| CN108763682B (en) * | 2018-05-16 | 2022-08-05 | 衢州学院 | Thermal optimization method and thermal optimization device of machine tool spindle based on Taguchi method |
| CN109374209B (en) * | 2018-12-19 | 2024-02-09 | 华电电力科学研究院有限公司 | Low-speed dynamic balance table for rotor and critical rotation speed prediction method |
| CN111693280B (en) * | 2020-06-03 | 2022-12-06 | 宁波大学 | Pneumatic bearing rotating speed measuring device and measuring method |
| CN112611564B (en) * | 2020-12-17 | 2022-11-15 | 大唐东北电力试验研究院有限公司 | Method and device for judging rigidity of steam turbine support bearing |
| CN116164969B (en) * | 2023-04-25 | 2023-07-21 | 东方电气集团东方电机有限公司 | Critical rotation speed detection method, device and storage medium |
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