CN109238697B - Rotor supporting system for testing performance of high-speed water lubrication dynamic pressure bearing - Google Patents
Rotor supporting system for testing performance of high-speed water lubrication dynamic pressure bearing Download PDFInfo
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- CN109238697B CN109238697B CN201810934663.9A CN201810934663A CN109238697B CN 109238697 B CN109238697 B CN 109238697B CN 201810934663 A CN201810934663 A CN 201810934663A CN 109238697 B CN109238697 B CN 109238697B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
Abstract
The invention discloses a rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing, and belongs to the technical field of mechanical design. The rotor supporting system comprises a main shaft (1), a high-speed rolling bearing (6) installed on the main shaft (1), a flexible coupling (17) arranged at the left end of the main shaft (1), a left support (14) and a right support (9) of a supporting shaft system, a testing bearing journal (19) arranged in the middle of the main shaft (1), a testing bearing bush (18) and a floating bearing seat (3), a bearing pre-tightening device arranged at the right end of the main shaft (1) and an oil-gas nozzle (8) arranged in the middle of a series bearing. The rotor supporting system for the performance test of the high-speed water-lubricated dynamic pressure bearing provided by the invention has the advantages of replaceable shaft neck, good lubricating effect, high rotation precision and large limit rotating speed, and can meet the test requirements of the performance test of the high-speed water-lubricated dynamic pressure bearing.
Description
Technical Field
The invention discloses a rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing, and belongs to the technical field of mechanical design.
Background
Dynamic parameters such as oil film rigidity, damping and the like of the sliding bearing directly influence the dynamic characteristics of a rotor system and have important influence on the rigidity, stability, critical rotating speed and the like of the rotor. Due to a plurality of factors influencing the dynamic parameters of the oil film, the dynamic parameter test research is indispensable in the research of the sliding bearing. The water-lubricated dynamic pressure bearing has the advantages of good high-speed performance, low cost, no pollution, simple peripheral equipment and the like, is one of the main directions in the bearing research field at present, and is very necessary to carry out the test research on the high-speed water-lubricated dynamic pressure bearing.
The research and development of the dynamic performance testing device of the water-lubricated bearing is the basis for completing the test. A core component of the testing device, namely a high-speed rotor supporting system, directly influences the performance of the test bed and determines the reliability and the testing precision of test data. The rotor working speed is high, the bearing calorific capacity is big, the vibration volume that awaits measuring is little in the water lubrication dynamic pressure bearing performance test, and this has proposed higher requirement to the design of rotor support system. However, the patents related to the dynamic performance test of bearings have focused on the structural configuration design of the oil lubrication test bed with medium and low rotation speeds. Patent reports on rotor support systems for high-speed water-lubricated dynamic pressure bearing performance tests have not been found. Aiming at the requirement, the invention discloses a rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing, aiming at improving the rotating speed of a water-lubricated bearing testing device, improving the dynamic characteristic of the rotor supporting system and improving the reliability of a testing result and the accuracy of testing data.
Disclosure of Invention
The technical problem is as follows: the invention discloses a rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing, aiming at the technical requirements of a water-lubricated dynamic pressure bearing performance testing device on a rotor supporting system, wherein the system has the characteristics of low bearing temperature rise and small rotor system vibration and aims to improve the testing precision of the water-lubricated dynamic pressure bearing performance testing device.
The technical scheme is as follows: the invention discloses a rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing, which solves the problems and adopts the technical scheme that:
the system comprises a main shaft, high-speed rolling bearings arranged at two ends of the main shaft, an oil-gas nozzle arranged in the middle of the series high-speed rolling bearings, a left support and a right support for supporting the high-speed rolling bearings, a flexible coupling arranged at the left end of the main shaft, and a test bearing bush arranged in the middle of the main shaft, wherein a test bearing journal is arranged between the main shaft and the test bearing bush, and the outer part of the test bearing bush is fixed on a floating bearing seat.
Wherein:
a right support end cover is arranged on a right support at the right end of the main shaft, a bearing pre-tightening spring is located in the right support end cover, a bearing pre-tightening pressing plate is located between the high-speed rolling bearing and the right support end cover, and two ends of the bearing pre-tightening spring are respectively pressed on the bearing pre-tightening pressing plate and the right support end cover.
The left end of the main shaft is connected with a driving source through a flexible coupling and rotates at a high speed under the support of a high-speed rolling bearing.
The flexible coupling is made of light hard aluminum materials and is connected with the main shaft through fine threads, a plurality of axial round holes are uniformly distributed on the disc surface at the right end of the flexible coupling in the circumferential direction, and a soft rope penetrates through the round holes to be connected with a driving source; under the condition of convenient soft rope connection, the smaller the diameter of the right disc surface is, the better the diameter is, the number of the round holes is generally 8, 10 or 12, and the diameter is 0.5-1mm larger than the diameter of the soft rope.
The main shaft is matched with a test bearing journal through a small conical surface in a ratio of 1:100-1:50, and is locked and fixed by using a journal fastening nut.
The number of oil gas outlets of the oil gas nozzle is 2-4, the length-diameter ratio L/d of the outlets is 6-7, and the distance s between the outlets and the bearing roller is about 0.5 time of the width value of the bearing.
The ratio of the supporting span to the equivalent weight of the main shaft is less than 6, the balance grade meets G0.4, and the first-order critical rotating speed is more than 1.3 times of the highest working rotating speed.
Has the advantages that: the invention discloses a rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing, which has the advantages that the tested bearing journal can be replaced, the bearing lubricating effect is good, the rotor rotation precision is high, and the limit rotating speed of a testing device is high.
Drawings
FIG. 1 is a structural layout of a rotor support system for high speed water lubricated hydrodynamic bearing performance testing;
FIG. 2 is a structure of a flexible coupling;
FIG. 3 is a removable journal structure;
FIG. 4 is a basic configuration of a high-speed rolling bearing oil-gas lubrication system;
fig. 5 is an oil and gas nozzle structure and operating principle.
The figure shows that: the device comprises a main shaft 1, a left end cover 2 of a floating bearing seat, the floating bearing seat 3, a shaft neck fastening nut 4, a right end cover 5 of the floating bearing seat, a high-speed rolling bearing 6, a retainer ring 7, an oil-gas nozzle 8, a right support 9, a bearing pre-tightening bolt 10, a bearing pre-tightening pressing plate 11, a right support end cover 12, a bearing pre-tightening spring 13, a left support 14, a connecting bolt 15, a left support end cover 16, a flexible coupling 17, a test bearing bush 18, a test bearing shaft neck 19, an air compressor 20, a filter 21, an air storage tank 22, a cold dryer 23 and an oil.
S is the distance from the oil-gas nozzle outlet to the bearing roller, L is the length of the oil-gas nozzle, and d is the diameter of the oil-gas nozzle.
Detailed Description
1. The invention discloses a rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing, which specifically comprises a main shaft 1, a left end cover 2 of a floating bearing seat, a floating bearing seat 3, a journal fastening nut 4, a right end cover 5 of the floating bearing seat, a high-speed rolling bearing 6, a check ring 7, an oil-gas nozzle 8, a right bracket 9, a bearing pre-tightening bolt 10, a bearing pre-tightening pressing plate 11, a right bracket end cover 12, a bearing pre-tightening spring 13, a left bracket 14, a connecting bolt 15, a left bracket end cover 16, a flexible coupling 17, a testing bearing bush 18 and a testing bearing journal 19, as shown in figure 1. The flexible coupling 17 is a specially designed structure, is connected with and transmits power through a flexible rope, is connected with the main shaft 1 through a fine thread, and transmits driving torque to drive the main shaft 1 to rotate at a high speed; the left bracket end cover 16 is connected with the left bracket 14 through a connecting bolt 15; the high-speed rolling bearing 6 adopts a face-to-face serial arrangement mode, an oil-gas nozzle 8 is arranged in the middle of the serial bearing, and a test bearing journal 19 conical surface is matched with the main shaft 1 and is locked and fixed by using a journal fastening nut 4; the test bearing bush 18, the left end cover 2 of the floating bearing seat, the right end cover 5 of the floating bearing seat and the floating bearing seat 3 float integrally on the main shaft 1; the bearing pre-tightening spring 13 is arranged between the right bracket end cover 12 and the bearing pre-tightening pressing plate 11; the right support end cover 12 is connected with the right support 9 through a bearing pre-tightening bolt 10, a compression bearing pre-tightening spring 13 is moved to the left side under the action of the bearing pre-tightening bolt 10, the compressed bearing pre-tightening spring 13 pushes a bearing pre-tightening pressing plate 11 to move to the left side, the bearing pre-tightening pressing plate 11 transmits pre-tightening force to the high-speed rolling bearing 6, bearing pre-tightening is achieved, and the pre-tightening force can be adjusted through the bearing pre-tightening bolt 10.
2. The invention relates to a flexible coupling design, in particular to a rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing, wherein a flexible coupling (17) is made of hard aluminum, 10 axial round holes are uniformly distributed on the disk surface of the right end in the circumferential direction, a soft rope can pass through the round holes for connection, an inner hole is connected with a main shaft (1) through M16 fine-tooth threads, the flexible coupling (17) is simple in structure and light in weight, and the specific structure is shown in figure 2.
3. The invention relates to a detachable shaft neck design, in particular to a rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing, as shown in figure 3, a test bearing shaft neck 19 is matched with a main shaft through a small conical surface of 1:50 and is locked and fixed by a shaft neck fastening nut 4, the shaft neck is easy to detach and replace, and the requirement that the test bearing needs to be replaced frequently is met.
4. The oil-gas lubrication design specifically comprises the following two parts:
(a) the configuration design of the oil-gas lubrication system of the high-speed rolling bearing is shown in fig. 4, and the system specifically comprises an oil-gas generator 24, a cold dryer 23, an air compressor 20, a filter 21, an air storage tank 22 and other devices. The air compressor 20 generates high-pressure air, the high-pressure air passes through the filter 21 to reach the air storage tank 22, and then passes through the cold dryer 23 to flow through the oil gas generator 24 at constant pressure; the oil gas generator injects lubricating oil into a high-pressure gas pipeline, and the oil gas is finally conveyed to a lubricated bearing.
(b) Determining the optimal numerical value of key geometric parameters of the oil-gas nozzle, obtaining the influence rule of each parameter on the oil-gas lubrication effect by using a test method for testing the working temperature rise of the bearing by using a thermocouple, and determining the optimal value of the key parameters according to the test result, wherein the number of outlets of the oil-gas nozzle is 2, the length-diameter ratio L/d of the outlets is 6.4, and the distance s from the outlets to the bearing roller is 6.4 mm.
5. The important index checking of the rotor supporting system specifically comprises the following three parts:
(a) and (4) checking the support span, wherein in order to reduce the influence of the deflection deformation of the main shaft on the test data, the rigidity of the main shaft is as large as possible, and the support span of the main shaft is reduced as small as possible. And reserving corresponding test sensor installation space, designing the axial structure of the rotor supporting system as compact as possible, designing the final span to be 160mm, designing the equivalent diameter of the main shaft to be 30.4mm, and designing the equivalent diameter ratio of the span to the main shaft to be 5.26 and less than 6.
(b) And (4) checking the dynamic balance, wherein the unbalance amount of the main shaft is as small as possible, a rotor dynamic balance test is carried out at the highest working rotating speed of the rotor of 30000rpm, the unbalance amount is checked, the unbalance mass of the rotor after the checking is 0.006G, and the requirement of the balance grade G0.4 is met.
(c) And (4) checking the critical rotating speed, and calculating the critical rotating speed and the vibration mode of the rotor supporting system under three pre-tightening conditions by using ANSYS finite element software, wherein the results are shown in a table 1. According to the calculation result, the first-order critical rotating speeds of the rotors under the three pre-tightening conditions are 68010rpm, 82932rpm and 97446rpm respectively, the highest working rotating speed of the rotors is 30000rpm, and the first-order critical rotating speeds are 226.7%, 276.4% and 324.8% of the highest working rotating speed of the rotors respectively, so that the design requirement is met, and the test reliability and the accuracy of test data can be ensured.
The rotor supporting system for testing the performance of the high-speed water-lubricated dynamic pressure bearing, disclosed by the invention, has the advantages of replaceable shaft neck, good lubricating effect, high rotation precision and high limit rotating speed, so that the bearing test is more convenient, and the reliability of a test result and the accuracy of test data are improved.
TABLE 1 calculation of critical rotor speed for three pre-tightening conditions
Claims (5)
1. A rotor supporting system for testing the performance of a high-speed water-lubricated dynamic pressure bearing is characterized by comprising a main shaft (1), high-speed rolling bearings (6) arranged at two ends of the main shaft (1), an oil-gas nozzle (8) placed in the middle of the high-speed rolling bearings (6) connected in series, a left support (14) and a right support (9) for supporting the high-speed rolling bearings (6), a flexible coupling (17) arranged at the left end of the main shaft (1), a test bearing bush (18) arranged in the middle of the main shaft (1), a test bearing journal (19) positioned between the main shaft (1) and the test bearing bush (18), and the outer part of the test bearing bush (18) is fixed on a floating bearing seat (3);
a right support end cover (12) is arranged on a right support (9) at the right end of the main shaft (1), a bearing pre-tightening spring (13) is positioned in the right support end cover (12), a bearing pre-tightening pressing plate (11) is positioned between the high-speed rolling bearing (6) and the right support end cover (12), and two ends of the bearing pre-tightening spring (13) are respectively pressed on the bearing pre-tightening pressing plate (11) and the right support end cover (12);
the left end of the main shaft (1) is connected with a driving source through a flexible coupling (17) and rotates at a high speed under the support of a high-speed rolling bearing (6).
2. The rotor supporting system for the high-speed water lubrication dynamic pressure bearing performance test is characterized in that the flexible coupling (17) is made of light hard aluminum materials and is connected with the main shaft (1) through fine threads, a plurality of axial round holes are uniformly distributed in the circumferential direction on the disk surface of the right end of the flexible coupling (17), and a soft rope penetrates through the round holes to be connected with a driving source; under the condition of facilitating the connection of the soft rope, the smaller the diameter of the right disc surface is, the better the diameter is, the number of the round holes is 8, 10 or 12, and the diameter of the round holes is 0.5-1mm larger than that of the soft rope.
3. The rotor support system for the high-speed water-lubricated dynamic pressure bearing performance test according to claim 1, wherein the main shaft (1) and the test bearing journal (19) are matched through a small conical surface of 1:100-1:50 and are locked and fixed by using a journal fastening nut (4).
4. The rotor supporting system for the performance test of the high-speed water lubrication dynamic pressure bearing according to claim 1, wherein the number of oil and gas outlets of the oil and gas nozzle (8) is 2-4, the length-diameter ratio L/d of the oil and gas outlets is 6-7, and the distance s from the oil and gas outlets to the high-speed rolling bearing roller is 0.5 times of the width value of the high-speed rolling bearing.
5. The rotor supporting system for the high-speed water-lubricated dynamic pressure bearing performance test according to claim 1, wherein the main shaft (1), a supporting span to equivalent ratio is less than 6, a balance grade satisfies G0.4, and a first-order critical rotation speed is more than 1.3 times of the highest working rotation speed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810934663.9A CN109238697B (en) | 2018-08-16 | 2018-08-16 | Rotor supporting system for testing performance of high-speed water lubrication dynamic pressure bearing |
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| CN201810934663.9A CN109238697B (en) | 2018-08-16 | 2018-08-16 | Rotor supporting system for testing performance of high-speed water lubrication dynamic pressure bearing |
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| CN109238697B true CN109238697B (en) | 2020-10-16 |
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| CN101876590B (en) * | 2009-12-04 | 2012-07-04 | 华中科技大学 | Comprehensive performance test table for water-lubricated dynamic-static pressure radial sliding bearing |
| CN105259099B (en) * | 2015-10-26 | 2018-08-21 | 东南大学 | A kind of ultrahigh speed water lubriucated bearing cavitation test device |
| CN105403408A (en) * | 2015-12-01 | 2016-03-16 | 哈尔滨电机厂有限责任公司 | Bidirectional-loading double-turning water-lubrication thrust bearing testing apparatus with pretightening force |
| CN106017931B (en) * | 2016-07-18 | 2019-08-23 | 上海交通大学 | Water lubriucated bearing greasy property test device and method in the case where axis misaligns operating condition |
| CN106425635B (en) * | 2016-12-15 | 2018-04-06 | 常州机电职业技术学院 | Electro spindle based on hydrodynamic sliding bearing |
| CN107462419B (en) * | 2017-08-16 | 2023-08-29 | 无锡锡压压缩机有限公司 | Performance test bench for water lubrication dynamic pressure radial thrust sliding bearing |
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