CN1077257A - Increase steady method of slight and the device thereof of pressing down - Google Patents
Increase steady method of slight and the device thereof of pressing down Download PDFInfo
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- CN1077257A CN1077257A CN 92102651 CN92102651A CN1077257A CN 1077257 A CN1077257 A CN 1077257A CN 92102651 CN92102651 CN 92102651 CN 92102651 A CN92102651 A CN 92102651A CN 1077257 A CN1077257 A CN 1077257A
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Abstract
A kind of being widely used in has sliding bearing---and increasing of all kinds of machineries of rotor-support-foundation system surely presses down method of slight and device thereof, it is characterized in that, one device is set on rotor, when rotor moves below a certain qualification rotating speed, device does not produce amount of unbalance, rotor keeps original dynamic balance accuracy, after rotating speed surpasses the qualification rotating speed, device begins to produce suitable amount of unbalance, thereby make the amount of unbalance of rotor increase along with the rising of rotating speed, improved the stability of rotor-support-foundation system, suppressed oil whirl and oil whip, had simple in structure, it is convenient to implement, increase steady inhibition of vibration outstanding feature.
Description
The present invention relates to a kind of steady method of slight and device thereof of pressing down that increase, the oil whirl in particularly a kind of rotor-support-foundation system (hereinafter to be referred as system) that suppresses sliding supported condition and the method and apparatus of oil whip.
The present invention can be widely used in all kinds of machineries with sliding bearing-rotor system.
The rotor-support-foundation system of sliding supported condition usually can run into two kinds of vibrations in when operation, i.e. the self oscillations that causes of the unbalance vibration that causes of amount of unbalance and oil-film force.When the rotor low cruise, excessive amount of unbalance can produce bigger unbalance vibration, and particularly near critical speed of rotation, this vibration is extremely dangerous.In order to reduce unbalance vibration, usually the way of Cai Yonging is to make rotor have higher dynamic balance accuracy.
(surpass instability speed) when rotor high-speed moves, oil whirl and oil whip can take place in system, and this class vibration is in case generation tends to cause serious accident even catastrophic consequence.Nonlinear vibration calculating and experimental study that rotor-support-foundation system is done show: during the rotor high-speed operation, suitable amount of unbalance can suppress low-frequency vibration effectively, reduce amplitude, hinder the generation of oil whirl, and can improve the oil whip starting point greatly.
Because the contradiction that above-mentioned two aspects require, particularly for a long time, but people increase surely the shake ignorant and the ignorance of characteristic to amount of unbalance, and have often only noticed the harmful one side of amount of unbalance.
In order to improve the stability of rotor-support-foundation system, suppress oil whirl and oil whip, people have used as devices such as squeeze film damper and electromagnetic bearings, and wherein, but squeeze film damper is to realize increasing the purpose of surely shaking by the damping that increases supporting.And electromagnetic bearing is to change the rigidity and the damping of supporting or apply control force to rotor by the mode of controlling to reach same purpose.Because complexity on this class apparatus structure and the narrow limitation on the method, thereby be difficult to be widely used in all kinds of machineries with rotor-support-foundation system.
In addition, also have the device of another kind of inhibition solid of rotation vibration, it is characterized in that device rotates with rotor, but by making solid of rotation keep balance to realize the purpose of shaking.These class methods and device for reduce unbalance response particularly reduce by critical speed of rotation and unbalance vibration when moving in its vicinity effective beyond doubt.Just belong to this class as U. S. Patent 4295386, this invention realizes the purpose of balance rotating body by liquid flowing when rotated in the balance oil pocket of device.Yet even rotor has absolute balance, this does not have the inhibition effect for oil whirl and oil film vibration yet.
The purpose of this invention is to provide a kind of method and device thereof, be used for suppressing the oil whirl and the oil whip of rotor-support-foundation system.Have simple in structure, implement convenient, increase steady inhibition of vibration outstanding feature.
The invention is characterized in and on rotor, apply a device, this device can make the amount of unbalance of rotor change with rotating speed, when rotor moves below a certain qualification rotating speed, device does not produce amount of unbalance, rotor keeps original dynamic balance accuracy, after rotating speed surpasses the qualification rotating speed, device begins to produce suitable amount of unbalance, thereby make the amount of unbalance of rotor increase along with the rising of rotating speed, the so-called rotating speed that limits is finger device pairing rotating speed when beginning to produce amount of unbalance, this rotating speed should be near the instability speed of system, so-called suitable amount of unbalance is that the amount of unbalance of finger device generation will enough suppress the low-frequency vibration in the rotor-support-foundation system, but can not cause excessive power frequency (the pairing frequency of working speed) vibration.
After the working speed of rotor surpassed the first critical speed of system, the uneven centrifugal force of rotor was because the change of its phase place, thereby had self centering effect, and the high more this effect of rotating speed is remarkable more.On the other hand, rotor unbalance centrifugal force has inhibitory action to oil whirl and oil whip, and in suitable scope, amount of unbalance is big more, and it is remarkable more to suppress effect.The reason that produces this effect is that the uneven centrifugal force of rotor always tries hard to make the frequency of vortex motion of rotor and power frequency to be consistent during high speed, has so also just hindered the generation of this class low-frequency vibration of oil whirl and oil whip.In addition, axle journal in bearing during with higher frequency whirling motion, the damping that bearing produces than axle journal with much bigger under the low frequency vortex motion state.Because uneven centrifugal force has the effect that suppresses low frequency, self-alignment and increase bearing damp when high speed, thereby the amount of unbalance that utilizes rotor realizes that but it is feasible increasing the purpose of surely shaking, theoretical calculation and experimental study show that all suitable amount of unbalance can suppress oil whirl and oil whip significantly and don't can cause excessive unbalance response.
Realize a kind of device of said method, it is characterized in that, add a wheel disc that comprises elastic slide block at the rotor portion of system, when the rotor low cruise, the pretightening force of elastic slide block is greater than its centrifugal force, slide block radially can not move, thereby rotor keeps original dynamic balance accuracy, after rotating speed surpasses the qualification rotating speed, the centrifugal force of elastic slide block will be greater than its pretightening force, and slide block radially moves to new equilibrium position, thereby produces needed amount of unbalance.This device is mainly by a wheel disc with place the elastic slide block with certain pretightening force in the wheel disc to form.Elastic slide block radially places in the wheel disc, plays the supporting fixation by end cap, and end cap is fixed on the wheel disc by attachment pegs.When slide block radially is in initial position (slide block leans on pretightening force radially fixedly the time), the barycenter of whole device should be positioned on the spin axis of wheel disc, and this device is contained in the rotating shaft by the circle hole sleeve on the wheel disc and rotates with rotor.
Another embodiment of this device is when rotor itself has wheel disc, directly elastic slide block to be placed in the wheel disc of rotor.
For the initial barycenter of assurance device is positioned on the spin axis, the wheel disc that is equipped with elastic slide block on the wheel disc of device or the rotor needs to cause the redundance excision of mass eccentricity.Like this, in rotary course, as long as slide block does not radially move, device just can not bring extra amount of unbalance, and in a single day slide block radially moves, and device will produce amount of unbalance.The size of the amount of unbalance that device produces and the relation of rotating speed are by the characteristic decision of elastic element.
This shows, pressing down method of slight with other compares with device, the invention process is convenient, simple in structure, it is remarkable to increase steady inhibition of vibration, under the situation that does not change rotor, bearing and fondational structure thereof, use the present invention and can improve the starting point of rotor-support-foundation system oil whirl and oil whip greatly, thereby the present invention can be widely used in all kinds of machineries with sliding bearing-rotor system.
Fig. 1 is the erection drawing of this device.
Fig. 2 is that the A-A of this device is to office's sectional view.
Fig. 3 is the legend that practices of this device.
Fig. 4 is the axonometric drawing of wheel disc.
Fig. 5 is the axonometric drawing of slide block.
Fig. 6 is the axonometric drawing of end cap.
Fig. 7 is the axonometric drawing of single elastic element.
Fig. 8 is the later axonometric drawing of elastic element assembling.
Fig. 9 is the connecting link pin mapping.
Below, in conjunction with the accompanying drawings the structural principle and the working principle of device of the present invention are done detailed explanation.
This device is by a wheel disc (1), slide block (2), elastic element (3), fixedly end cap (4) and attachment pegs (5) are formed.Use when center hole (6) supplying apparatus on the wheel disc (1) and the axle sleeve of rotor (7) dress.One concave station (8) is set on the external peripheral surface of wheel disc (1), two circular holes that have diameter not wait along the radial arrangement of wheel disc at the middle part of concave station (8), wherein Di Bu small sircle hole (10) is for the location and the guiding of slide block (2), place elastic element (3) in the big hole (9), the outer gap of this circular hole cooperates an end cap (4).The wheel of concave station (8) both sides along on be drilled with four circular holes (11) that diameter is identical, the center line of two corresponding circular holes is coaxial, these two pairs of circular holes are used for assembling attachment pegs (5).Go up a side relative with concave station (8) at wheel disc (1) and cut a part vertically, formed a chain-wales, this is that initial barycenter for assurance device is positioned on the spin axis.
The structure of slide block (2) is two sections cylinders that diameter does not wait, wherein the end that diameter is bigger places the small sircle hole (10) on the wheel disc (1), this section cylinder and small sircle hole (10) keep movingly, slide block (2) can radially be free to slide in small sircle hole (10) under free state, slide block (2) is gone up endoporus that the less column part of diameter is inserted in elastic element (3) for elasticity element (3) location and guiding, and the roundlet platform on the slide block (2) plays the supporting positioning action for elasticity element (3).Under original state, slide block (2) is in the bottom that is positioned at the small sircle hole (10) on the wheel disc (1) under the pretightening force effect of elastic element (3).
Elastic element (3) is generally belleville spring or diaphragm spring, and an end bearing of elastic element (3) is on the round platform of slide block (2), and the other end is bearing on the evagination round platform of end cap (4).Under original state, elastic element (3) has had certain pretightening force, after the rotational speed of device surpasses the qualification rotating speed, the centrifugal force of slide block (2) and elastic element (3) will be greater than the pretightening force of elastic element (3), therefore, slide block (2) will radially outwards move, thereby make elastic element (3) produce bigger elastic force to reach and the centrifugal force balance.After slide block (2) radially moves, the barycenter of device will depart from its spin axis, so just produce amount of unbalance.Under different rotating speeds, the amount of unbalance that device produces is by the characteristic decision of elastic element (3).The amount of unbalance that device produces and the relation of rotating speed are will be enough to suppress low-frequency vibration but can not produce this principle of excessive unbalance response determine that the characteristic of elastic element (3) will can guarantee the realization of this relation basically according to amount of unbalance.
End cap (4) is used at the fixing elastic element (3) of wheel disc (1) upper support, one end bearing of elastic element (3) is on the evagination round platform of end cap (4), the middle part of dome platform has the endoporus of a diameter greater than the small column diameter of slide block (2) outside, the degree of depth of endoporus is used to limit slide block (2) maximum moving distance radially, the limit amount of unbalance that device can produce by this apart from limiting.Little round tube hole in endoporus is provided with for the quality that reduces end cap (4).Have two identical circular holes of diameter to supply assembling attachment pegs (5) usefulness on the width direction of end cap (4), these two circular holes and attachment pegs (5) keep transition fit.The location of end cap (4) is determined by the matching relationship of the inner surface on two sides of the matching relationship of the big hole (9) on its evagination round platform and the wheel disc (1) and end cap (4) and concave station (8) two side wheel edges, for the ease of assembling, this matching relationship of several adopts movingly.
Attachment pegs (5) be used between end cap (4) and the wheel disc (1) connect fastening.Attachment pegs (5) adopts transition fit with matching hole and hole (11) on the end cap (4).
After device assembles, must carry out dynamic balance running, device is limiting below the rotating speed, and its dynamic balance accuracy is identical with the dynamic balance accuracy of rotor.
Claims (5)
1, increases the steady method of slight that presses down, it is characterized in that, one device is set on rotor, this device can make the amount of unbalance of rotor change with rotating speed, and when rotor moved below a certain qualification rotating speed, device did not produce amount of unbalance, rotor keeps original dynamic balance accuracy, after rotating speed surpassed the qualification rotating speed, device began to produce suitable amount of unbalance, thereby makes the amount of unbalance of rotor increase along with the rising of rotating speed.
2, according to claim 1 increasing surely presses down method of slight, it is characterized in that the amount of unbalance that is produced is enough to suppress low-frequency vibration but does not cause excessive unbalance response.
3, realize the device of the described method of claim 1, comprise a wheel disc that can cooperate, it is characterized in that radially dispose an elastic slide block in the wheel disc, elastic slide block radially supports the location by an end cap with rotor coaxial.
4, device according to claim 3 is characterized in that, said elastic slide block comprises that one radially is disposed at the slide block in the wheel disc and is sleeved on elastic element on the slide block.
5, device according to claim 3 is characterized in that, said end cap is fixed on the wheel disc by attachment pegs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102651 CN1077257A (en) | 1992-04-11 | 1992-04-11 | Increase steady method of slight and the device thereof of pressing down |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102651 CN1077257A (en) | 1992-04-11 | 1992-04-11 | Increase steady method of slight and the device thereof of pressing down |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1077257A true CN1077257A (en) | 1993-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92102651 Pending CN1077257A (en) | 1992-04-11 | 1992-04-11 | Increase steady method of slight and the device thereof of pressing down |
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| CN (1) | CN1077257A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318774C (en) * | 2004-05-11 | 2007-05-30 | 浙江大学 | Oil film oscillation fault on-line elimination method and apparatus |
| CN103148163A (en) * | 2011-12-07 | 2013-06-12 | 舍弗勒技术股份两合公司 | A centrifugal force pendulum with a damper |
| CN105579739A (en) * | 2013-09-26 | 2016-05-11 | 舍弗勒技术股份两合公司 | Centrifugal force pendulum having an impact damper |
| CN108916306A (en) * | 2018-07-12 | 2018-11-30 | 西安交通大学 | A kind of heavy type rotor vibration-repressing device |
-
1992
- 1992-04-11 CN CN 92102651 patent/CN1077257A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318774C (en) * | 2004-05-11 | 2007-05-30 | 浙江大学 | Oil film oscillation fault on-line elimination method and apparatus |
| CN103148163A (en) * | 2011-12-07 | 2013-06-12 | 舍弗勒技术股份两合公司 | A centrifugal force pendulum with a damper |
| CN105579739A (en) * | 2013-09-26 | 2016-05-11 | 舍弗勒技术股份两合公司 | Centrifugal force pendulum having an impact damper |
| CN105579739B (en) * | 2013-09-26 | 2018-06-08 | 舍弗勒技术股份两合公司 | Centrifugal force pendulum with backstop damper |
| CN108916306A (en) * | 2018-07-12 | 2018-11-30 | 西安交通大学 | A kind of heavy type rotor vibration-repressing device |
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