CN101545510A - Controllable radial oil film bearing - Google Patents
Controllable radial oil film bearing Download PDFInfo
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- CN101545510A CN101545510A CN200910050367A CN200910050367A CN101545510A CN 101545510 A CN101545510 A CN 101545510A CN 200910050367 A CN200910050367 A CN 200910050367A CN 200910050367 A CN200910050367 A CN 200910050367A CN 101545510 A CN101545510 A CN 101545510A
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- oil film
- displacement
- radial oil
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Abstract
The invention provides a controllable radial oil film bearing. The radial oil film bearing comprises a bearing pedestal and a bearing. Three or four devices supporting the bearing are arranged on the bearing pedestal, wherein two devices are micro-displacement actuators, and the others are elastic supports. Two displacement transducers are arranged opposite to the micro-displacement actuators. According to rotor axis position detected by the displacement transducers, the micro-displacement actuators regulate the axis position of the bearing so as to realize the following three functions which a common oil film bearing is not provided with: accurate alignment of the rotor axis, sensitive feed and initiative vibration control.
Description
Technical field
The present invention is the initiatively radial oil film bearing of dynamic adjustments of a kind of oil slick thickness.Use this bearing as support, can suppress in the mode of active damping rotor-support-foundation system vibration, realize the microfeed of rotor axis or keep constant gyration center.This bearing mainly can be applicable to bear radially work loads in the various rotating machineries, as various machinery such as high precision machine tool, steam turbine, generator, compressor, blower fan, water pumps.
Background technique
Traditional radial dynamic pressure slip filmatic bearing as structure filmatic bearings such as circular journal bearing, elliptic bearing, three oil film wedges, four oil film wedges, has two shortcomings: the one, and the rotor that it supports can be in different rotating centers with the variation of extraneous load; The 2nd, traditional filmatic bearing can not active damping.These two drawbacks limit the traditional application of radial oil film bearing in the highi degree of accuracy rotor-support-foundation system.There is not above-mentioned shortcoming though have the magnetic suspension bearing of active control function, because its bearing capacity is lower, the cost height, less in industrial direct application.
Summary of the invention
The objective of the invention is to above-mentioned defective at traditional radial oil film bearing, a kind of controllable radial oil film bearing is provided, can control bearing outside automatically and realize the trace adjustment of its spatial position, reach the automatic control of rotor axis position and the active damping of rotor oscillation.
The principle of controllable radial oil film bearing is shown in figure one.Controlled bearing has increased by two micro-displacement actuators and two displacement transducers on the basis of conventional oil film bearing.Wherein micro-displacement actuator is used to regulate the shaft core position of bearing, and displacement transducer is used to measure the rotor axis position.Bearing provided by the invention has three functions that the conventional oil film bearing does not possess.At first, gather the shaft core position signal of rotor by displacement transducer, the rotor that causes for different load is in different rotating centers, can adjust the position of bearings by micro-displacement actuator, make rotor return the rotating center of appointment, rotor can be guaranteed on the fixed position always, thereby improve the support accuracy of bearing.Secondly, adjust the position of bearings, make the orbiting motion of rotor, realize the microfeed of rotor according to appointment by micro-displacement actuator.In addition, according to the rotor oscillation signal that displacement transducer records in real time, micro-displacement actuator applies the vibration weakening that excitation force makes rotor to bearing, realizes active damping.
According to the foregoing invention conception, the present invention adopts following technical proposals:
A kind of controllable radial oil film bearing comprises bearing support and bearing, it is characterized in that installing on bearing support the device of three or four spring bearings, and wherein two is micro-displacement actuator, and all the other are elastic support; Two displacement transducers are settled on the opposite that is positioned at two micro-displacement actuators.
Above-mentioned bearing circumferentially has the device of three spring bearings, and wherein top one is elastic support, below two be the micro-displacement actuator of at right angles arranging.
Above-mentioned bearing has the device of four circumferential uniform spring bearings, and wherein two are micro-displacement actuator: one is horizontal micro-displacement actuator, and another is vertical micro-displacement actuator.
Above-mentioned micro-displacement actuator is the ultra-magnetostriction microdisplacement actuator, and described resilient supporting unit is the prefastening force spring device.
The structure of above-mentioned ultra-magnetostriction microdisplacement actuator is: a giant magnetostrictive rod is settled in the center of an electromagnetic coil, and described bearing is supported by a displacement take-off lever and roller in the top of this giant magnetostrictive rod.
Above-mentioned electromagnetic coil is wound on the coil rack, and is fixedly mounted in the groove of described bearing by an end cap, and described end cap has center screw to revolve to join a plug screw of adjusting the little excellent position of described ultra-magnetic telescopic.
Above-mentioned electromagnetic coil is made of inside and outside two coils, and outer coil is connected DC electrical source and produced the stable state bias magnetic field; Inner coil is connected ac power supply and is produced alternating magnetic field.
The present invention and prior art are compared, and have conspicuous outstanding feature and remarkable advantage: can alleviate the influence degree that the rotor gyration center that is supported is subjected to factors such as load, rotating speed and oily temperature greatly, have good centering metancenter effect; Can drive the rotor that is supported and radially move, have the function of microfeed; Can offer the rotor excitation force that is supported, weaken the rotor radial vibration, have the ability of active vibration control.
Description of drawings
Fig. 1 one embodiment of the invention, the structural representation of controllable radial bearing.
Fig. 2 is the axial section of the structure example of A-A place controllable radial bearing among Fig. 1
The theory structure schematic representation of Fig. 3 controllable radial four oil film wedge filmatic bearings
The theory structure schematic representation of Fig. 4 controllable radial circular journal bearing
The theory structure schematic representation of Fig. 5 controllable radial elliptic bearing
The theory structure schematic representation of Fig. 6 controllable radial three-wedge bearing
Embodiment
The preferred embodiments of the present invention accompanying drawings is as follows:
Embodiment one:
Referring to Fig. 1 and Fig. 2, this controllable radial oil film bearing comprises bearing support 1 and bearing 4, settles along the device of four circumferentially uniform spring bearings 4 on the bearing support 1, and wherein two is micro-displacement actuator, and all the other are resilient supporting unit.Two displacement transducers 5,9 are settled on the opposite that is positioned at two micro-displacement actuators.The axial position of bearing 4 can not be moved axially or axis tilt by bearing support 1 and end cap 10 location; Horizontal micro-displacement actuator 7 is supported on bearing 4 outer surfaces with vertical micro-displacement actuator 2, and the output displacement of these two micro-displacement actuators has determined the shaft core position of bearing 4.
The structure of level and vertical micro-displacement actuator is identical with principle, is the ultra-magnetostriction microdisplacement actuator.Be the example explanation only below with vertical micro-displacement actuator.Micro-displacement actuator is made of giant magnetostrictive rod 2, electromagnetic coil 205, coil rack 202, end cap 201, adjustment bolt 203 and displacement take-off lever 204 etc.Giant magnetostrictive rod 2 is contained in the electromagnetic coil 205, and an end is fixed on to be regulated on the bolt 203, and the other end withstands on the take-off lever 204, and there are roller 3 spring bearings 4 on take-off lever 204 tops.Giant magnetostrictive rod 2, take-off lever 204, bearing support 1, end cap 201 and adjustment bolt 203 constitute the magnetic circuit of sealing.When electromagnetic coil 205 has electric current to pass through, produce excitation field.Giant magnetostrictive rod 2 produces strain along axial direction in excitation field, cause the length change of giant magnetostrictive rod.Its extending amount changes with the variation of magnetic intensity.The extending amount of giant magnetostrictive rod 2 promotes bearing 4 by take-off lever 204 output displacement and power, changes the shaft core position of bearing 4.Regulate and adjust the initial position that bolt 203 can be regulated bearing.
Horizontal micro-displacement actuator 7 adopts contactless eddy current displacement sensor with vertical micro-displacement actuator 2.The shaft core position of the rotor of surveying according to displacement transducer 12 is regulated solenoid current, realizes the control of shaft core position or motion.
In order to improve the dynamic performance of micro-displacement actuator, electromagnetic coil 205 can split into inside and outside two coils, and outer coil 205b produces the bias magnetic field of stable state by direct current (d.c.); Inner coil 205a is used to produce alternating magnetic field by alternating current (a.c.).
Produce heat during electromagnetic coil work, cause the thermal distortion of actuator or cause the magnetostriction changes of properties.In bearing, offer the oil circuit 101 of cooling usefulness, utilize lubrication oil circulation to take away the heat that electromagnetic coil produces.Lubricant oil enters from the oil trap of coil front-end face, and the heat that electromagnetic coil produces is taken away, cooling coil in the excircle of flowing through coil and the gap between the inner hole of bearing seat, from the oil trap of coil bottom.
Two resilient supporting units are two prefastening force spring devices 6 and 8.These two resilient supporting units provide elastic support for bearing 4 on the one hand, and the aspect is respectively ultra-magnetic deformation actuator 7,2 again in addition provides pretightening force.The prefastening force spring support device adopts belleville spring, flat spring, leaf spring or helical spring etc.
When the bearing of this example is circular journal bearing as shown in Figure 4, when bearing is elliptic bearing as shown in Figure 5, when bearing is three-wedge bearing as shown in Figure 6.
Embodiment two:
This example and example one are basic identical, and institute's difference is: at the device of bearing support along three spring bearings that circumferentially distribute, wherein top one is resilient supporting unit, below two be micro-displacement actuator, as shown in Figure 3.
Claims (7)
1. a controllable radial oil film bearing comprises bearing support and bearing, it is characterized in that installing on bearing support the device of three or four spring bearings, and wherein two is micro-displacement actuator, and all the other are elastic support; Two displacement transducers are settled on the opposite that is positioned at two micro-displacement actuators.
2. controllable radial oil film bearing according to claim 1 is characterized in that described bearing has the device of three spring bearings, and wherein top one is elastic support, below two be the micro-displacement actuator of at right angles arranging.
3. controllable radial oil film bearing according to claim 1, it is characterized in that described bearing has the device of four circumferential uniform spring bearings, wherein two are micro-displacement actuator: one is horizontal micro-displacement actuator, and another is vertical micro-displacement actuator.
4. controllable radial oil film bearing according to claim 1 is characterized in that described micro-displacement actuator is the ultra-magnetostriction microdisplacement actuator, and described resilient supporting unit is the prefastening force spring device.
5. controllable radial oil film bearing according to claim 4, the structure that it is characterized in that described ultra-magnetostriction microdisplacement actuator is: a giant magnetostrictive rod is settled in the center of an electromagnetic coil, and described bearing is supported by a displacement take-off lever and roller in the top of this giant magnetostrictive rod.
6. controllable radial oil film bearing according to claim 5, it is characterized in that described electromagnetic coil is wound on the coil rack, and be fixedly mounted in the groove of described bearing by an end cap, described end cap has center screw to revolve to join a plug screw of adjusting the little excellent position of described ultra-magnetic telescopic.
7. controllable radial oil film bearing according to claim 5 is characterized in that described electromagnetic coil is made of inside and outside two coils, and outer coil is connected DC electrical source and produced the stable state bias magnetic field; Inner coil is connected ac power supply and is produced alternating magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910050367A CN101545510A (en) | 2009-04-30 | 2009-04-30 | Controllable radial oil film bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910050367A CN101545510A (en) | 2009-04-30 | 2009-04-30 | Controllable radial oil film bearing |
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| Publication Number | Publication Date |
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| CN101545510A true CN101545510A (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910050367A Pending CN101545510A (en) | 2009-04-30 | 2009-04-30 | Controllable radial oil film bearing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275993A (en) * | 2015-11-18 | 2016-01-27 | 浙江诺力机械股份有限公司 | Center-regulating buffering guiding sleeve device |
| CN106678177A (en) * | 2017-01-05 | 2017-05-17 | 上海应用技术大学 | Controllable compound damping and active vibration reducing magnetofluid bearing |
| CN109014252A (en) * | 2018-08-03 | 2018-12-18 | 重庆宏钢数控机床有限公司 | Main shaft waterproof barrel bearing A seating lathe |
| CN116181794A (en) * | 2023-04-21 | 2023-05-30 | 浙江亚微精密机床有限公司 | Bearing with floating block |
-
2009
- 2009-04-30 CN CN200910050367A patent/CN101545510A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275993A (en) * | 2015-11-18 | 2016-01-27 | 浙江诺力机械股份有限公司 | Center-regulating buffering guiding sleeve device |
| CN106678177A (en) * | 2017-01-05 | 2017-05-17 | 上海应用技术大学 | Controllable compound damping and active vibration reducing magnetofluid bearing |
| CN106678177B (en) * | 2017-01-05 | 2019-10-25 | 上海应用技术大学 | A kind of controllable composite damping active damping magnetic fluid bearing |
| CN109014252A (en) * | 2018-08-03 | 2018-12-18 | 重庆宏钢数控机床有限公司 | Main shaft waterproof barrel bearing A seating lathe |
| CN116181794A (en) * | 2023-04-21 | 2023-05-30 | 浙江亚微精密机床有限公司 | Bearing with floating block |
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Open date: 20090930 |