CN113803371A - Method for preventing magnetic-liquid double-suspension bearing from falling and protection loop thereof - Google Patents
Method for preventing magnetic-liquid double-suspension bearing from falling and protection loop thereof Download PDFInfo
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- CN113803371A CN113803371A CN202111071437.0A CN202111071437A CN113803371A CN 113803371 A CN113803371 A CN 113803371A CN 202111071437 A CN202111071437 A CN 202111071437A CN 113803371 A CN113803371 A CN 113803371A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0444—Details of devices to control the actuation of the electromagnets
- F16C32/0451—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
- F16C32/064—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being supplied under pressure
- F16C32/0644—Details of devices to control the supply of liquids to the bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses a method for preventing a magnetic-liquid double-suspension bearing from falling and a protection loop thereof, namely, a falling-prevention protection loop is connected in parallel in each supporting loop of a magnetic-liquid double-suspension bearing hydrostatic supporting system; each anti-falling protection loop is composed of an energy accumulator, a two-position electromagnetic directional valve and an adjustable throttle valve which are sequentially connected in series. When the electromagnetic suspension system fails, the electromagnetic system is firstly closed, the axis locus is detected by the displacement sensor, and the falling time of the bearing rotor is predicted. When the falling time is larger than the stability time threshold of the active speed regulating system, the rotating speed of the asynchronous motor and the gear pump is regulated only by the frequency converter to increase the oil supply pressure and flow of the static pressure cavity, so that the rotor is suspended temporarily, and the host is closed for maintenance. When the falling time is less than the time threshold, the anti-falling protection loop is quickly started, oil is supplied to the bearing static pressure cavity, buffering time is provided for the active speed regulation link, and the buffering time is larger than the difference value between the falling time and the active speed regulation time threshold.
Description
Technical Field
The invention relates to the field of protection devices, in particular to a method for preventing a magnetic-liquid double-suspension bearing from falling and a protection circuit thereof.
Background
The magnetic-liquid double-suspension bearing is a novel suspension bearing which takes electromagnetic suspension as a main part and static pressure bearing as an auxiliary part, and can additionally increase the static pressure bearing force on the premise of not influencing the electromagnetic suspension force, thereby effectively improving the running stability and the service life of the bearing. The magnetic-liquid double-suspension bearing is suitable for occasions with medium speed and heavy load, large bearing capacity and high operation stability and working conditions thereof. However, when the electromagnetic suspension system fails, the static pressure bearing system has a slow response speed, so that the rotor in the magnetic-liquid double-suspension bearing is easy to fall off, and damage is caused.
Disclosure of Invention
To solve the above problems in the prior art, an object of the present invention is to provide a protection circuit for preventing a magnetic-fluid double suspension bearing from falling when an electromagnetic suspension system fails.
The invention also aims to provide a protection method for preventing the magnetic-liquid double-suspension bearing from falling when the electromagnetic suspension system fails.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for preventing a magnetic-liquid double-suspension bearing from falling comprises the following steps:
s1, starting a system, detecting whether the pressure of the energy accumulator reaches the standard through a pressure gauge, if not, starting an asynchronous motor in an oil storage loop of the energy accumulator to supply oil to the energy accumulator through a gear pump until the pressure reaches the standard, and stopping the oil storage loop of the energy accumulator;
s2, detecting whether the current of the electromagnetic circuit of the electromagnetic levitation system is normal, and determining whether the electromagnetic system is failed?
S3, when the electromagnetic suspension system fails, the electromagnetic system is closed, the axis locus of the magnetic-liquid double-suspension bearing is detected through the displacement sensor, and the falling time t of the bearing rotor is predicted through the working condition machine according to the displacement signal;
s4, when the falling time t is larger than the active speed regulation time threshold td of the magnetic liquid double-suspension bearing, the rotating speed of an asynchronous motor and a gear pump in the static pressure supporting system is regulated only through the frequency conversion of a frequency converter in the active speed regulation link, the oil supply pressure P and the flow Q of a bearing static pressure cavity are increased, the rotor is suspended for a short time, and the main machine is closed for maintenance;
and when the falling time t is less than the active speed regulation time threshold value td, starting the anti-falling protection circuit, and rapidly supplying oil to the bearing static pressure cavity through an energy accumulator group in the anti-falling protection circuit to provide buffer time tb for the oil supply of the active speed regulation link, wherein the buffer time tb is greater than the difference value between the falling time t and the active speed regulation time threshold value td.
Preferably, the active speed regulation time threshold value td is determined by simulating rotor drop for multiple times.
A magnetic liquid double suspension bearing anti-falling protection loop for a method for preventing a magnetic liquid double suspension bearing from falling is characterized in that each support loop of a magnetic liquid double suspension bearing static pressure support system is connected with one anti-falling protection loop in parallel; each anti-falling protection loop comprises an energy accumulator, an electromagnetic directional valve and an adjustable throttle valve which are sequentially connected in series; the energy accumulator is connected with the gear pump, the asynchronous motor, the one-way valve, the pressure gauge and the oil tank in sequence to form an energy accumulator oil storage loop.
Compared with the prior art, the invention has the following beneficial effects:
because each working loop of the magnetic-liquid double-suspension bearing hydrostatic bearing system is connected with a drop-proof protection loop in parallel, when the electromagnetic suspension system fails, the electromagnetic system is immediately closed, the drop-proof protection loop is started, and lubricating oil in an energy accumulator of the drop-proof protection loop is quickly supplied to a hydrostatic cavity of the magnetic-liquid double-suspension bearing, so that the defect of low response speed of the hydrostatic bearing system is overcome, therefore, the invention can effectively avoid a series of hazards caused by the drop of a bearing rotor and prolong the service life of the bearing.
Drawings
FIG. 1 is a schematic diagram of the bearing force of a single degree of freedom magnetic liquid double suspension bearing;
FIG. 2 is a diagram of a magnetic liquid double-suspension bearing anti-falling protection loop when the electromagnetic suspension system of the invention fails;
fig. 3 is a flow chart of the magnetic-liquid double-suspension bearing falling prevention when the electromagnetic suspension supporting system fails.
The main reference numbers:
1. the device comprises a filter, 2, an overflow valve, 3, a gear pump, 4, an asynchronous motor, 5, a liquid thermometer, 6, a liquid level meter, 7, a one-way valve, 8, a flowmeter, 9, a filter, 10, a displacement sensor, 11, a magnetic-liquid double-suspension bearing, 12, a throttle valve, 13, an electromagnetic directional valve, 14, a pressure gauge, 15, an energy accumulator, 16 and a stop valve; 17. lower bearing unit, 18, lower bearing chamber, 19, upper bearing chamber, 20, upper bearing unit.
Detailed Description
The structure and features of the present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that various modifications can be made to the embodiments disclosed herein, and therefore, the embodiments disclosed in the specification should not be construed as limiting the present invention, but merely as exemplifications of embodiments thereof, which are intended to make the features of the present invention obvious.
The magnetic-liquid double-suspension bearing is a novel suspension bearing which takes electromagnetic suspension as a main part and static pressure support as an auxiliary part. The magnetic-liquid double-suspension bearing comprises two radial bearings and an axial bearing; the stator of the radial bearing is provided with four radial magnetic poles, each magnetic pole is provided with an oil inlet through hole, and every two magnetic poles form a magnetic flux loop and share one oil inlet; wherein, the axial bearing is provided with two permanent magnets, and two oil inlet holes are oppositely distributed on the stator.
As shown in fig. 2, each support loop of the hydrostatic support system of the magnetic-liquid double-suspension bearing comprises a gear pump 3, an asynchronous motor 4, a one-way valve 7, a pressure gauge 14 and a micro-flow meter 8 which are connected in sequence; the first end of each supporting loop is connected with the oil tank through an oil way, and the second end of each supporting loop is connected with the oil inlet cavity of the bearing. An oil return cavity of the magnetic-liquid double-suspension bearing 11, the filter 9, the cooler and the oil tank are sequentially connected to form an oil return loop of the static pressure supporting system. The gear pump 3 in each supporting loop is coaxially connected with the asynchronous motor 4, and the rotating speed of the asynchronous motor 4 is regulated and controlled by the frequency converter, so that the pressure of the upper cavity, the lower cavity, the left cavity and the right cavity of the bearing are controlled, and the control of the rotor is realized.
When the electromagnetic suspension system fails, because the response speed of the magnetic-liquid double-suspension hydrostatic bearing system is low, the rotor in the magnetic-liquid double-suspension bearing is easy to fall off, and therefore, as shown in fig. 2, a falling-prevention protection loop is connected in parallel in each supporting loop of the hydrostatic supporting system; each anti-falling protection loop is composed of an energy accumulator 15, an electromagnetic directional valve 13 and an adjustable throttle valve 12 which are sequentially connected in series.
The energy accumulator 15 is connected with the gear pump 3, the asynchronous motor 4, the one-way valve 7, the pressure gauge 14 and the oil tank in sequence to form an oil storage loop of the energy accumulator 15.
And a liquid thermometer 5 for measuring the oil temperature, a liquid level meter 6 for measuring the oil level, a filter 1 and an overflow valve 2 are also connected in the oil supply return of the magnetic-liquid double-suspension static pressure supporting system.
A shut-off valve 16 is also connected to the line connecting the accumulator 15 to the tank.
The invention provides a magnetic-liquid double-suspension bearing anti-falling protection method when an electromagnetic suspension system fails, which comprises the following steps:
as shown in fig. 3, before the system is started, firstly, a rotor falling process is simulated through multiple tests, a time range value t1-t2 of the rotor falling is measured, then, the anti-falling protection circuit is started, a flow range q1-q2 required by falling is measured, and the working pressure p of the anti-falling protection circuit is calculated according to the flow q2 and a pressure-flow calculation formula. The maximum working pressure of the accumulator 15 in the fall protection circuit is greater than or equal to the working pressure p of the fall protection circuit.
Secondly, a falling prevention protection loop consisting of the electromagnetic directional valve 13, the energy accumulator 15 and the throttle valve 12 is detected, the time range t3-t4 required by the electromagnetic suspension system to supply oil to the static pressure supporting system (the oil supply is less than or equal to q2) due to the failure of the electromagnetic suspension system is detected, and the proper valve port size of the throttle valve 12 is adjusted according to the time range t3-t 4.
And finally, detecting the active speed regulation link of a bearing consisting of a frequency converter in the working condition machine, an asynchronous motor 4 in a static pressure supporting loop and a gear pump 3, regulating the speed to ensure that the magnetic-liquid double-suspension bearing rotor normally suspends within a required time range t5-t6, and setting an active speed regulation time threshold td according to the time t 6.
When the magnetic-liquid double-suspension bearing rotor supporting system is started, whether the pressure of the energy accumulator 15 reaches the standard is judged through the display of the pressure gauge 14, the asynchronous motor 4 in the oil storage loop of the energy accumulator is started to supply oil to the energy accumulator 15 through the gear pump 3 under the condition that the pressure of the energy accumulator reaches the standard, and the oil storage loop stops working.
Then the magnetic-liquid double-suspension regulation module works, as shown in figure 1, the static pressure supporting force F of the bearing rotor in the upper supporting cavity 19Liquid, 1,0 Lower bearing chamber 18, hydrostatic bearing force FLiquid, 2,0And electromagnetic force F of upper support unit 20Electric, 1,0 Lower support unit 17, and electromagnetic force FElectric, 2,0Normally suspended under the coupling support. When the magnetic-liquid double-suspension bearing works normally, the current of the electromagnetic loop is detected in real time through the ammeter to judge whether the electromagnetic system fails.
And when the electromagnetic suspension system fails, the electromagnetic system is closed, the axis locus s of the magnetic-liquid double-suspension bearing is detected by the displacement sensor 10, and the falling time t of the bearing rotor is predicted through the working condition machine according to the displacement signal. When the falling time t is greater than the active speed regulation time threshold value td, the frequency converter of the active speed regulation working condition machine is only used for regulating the rotating speed of the asynchronous motor 4 and the gear pump 3, the oil supply pressure P and the flow Q of the static pressure cavity are increased, the bearing rotor is suspended temporarily, and the main machine is closed for maintenance.
When the falling time t is smaller than the active speed regulation time threshold value td, the electromagnetic directional valve 13 in the anti-falling protection loop responds rapidly, the electromagnetic directional valve 13 is opened, the energy accumulator group 15 supplies oil to the bearing static pressure cavity rapidly, a buffer time tb is provided for the oil supply of the active speed regulation link, and the buffer time tb is larger than the difference value between the falling time t and the active speed regulation time threshold value td.
The invention has the advantages that: when the electromagnetic suspension system fails, the anti-falling hydraulic protection circuit effectively overcomes the defect of low response speed of the static pressure support system, can effectively avoid a series of hazards caused by falling of the bearing rotor, and prolongs the service life of the bearing.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A method for preventing a magnetic-liquid double-suspension bearing from falling is characterized by comprising the following steps: which comprises the following steps:
s1, starting a system, detecting whether the pressure of the energy accumulator reaches the standard through a pressure gauge, if not, starting an asynchronous motor in an oil storage loop of the energy accumulator to supply oil to the energy accumulator through a gear pump until the pressure reaches the standard, and stopping the oil storage loop of the energy accumulator;
s2, detecting whether the current of the electromagnetic loop of the electromagnetic suspension system is normal, and judging whether the electromagnetic system is invalid;
s3, when the electromagnetic suspension system fails, the electromagnetic system is closed, the axis locus of the magnetic-liquid double-suspension bearing is detected through the displacement sensor, and the falling time t of the bearing rotor is predicted through the working condition machine according to the displacement signal;
s4, when the falling time t is larger than the active speed regulation time threshold td of the magnetic liquid double-suspension bearing, the rotating speed of an asynchronous motor and a gear pump in the static pressure supporting system is regulated only through the frequency conversion of a frequency converter in the active speed regulation link, the oil supply pressure P and the flow Q of a bearing static pressure cavity are increased, the rotor is suspended for a short time, and the main machine is closed for maintenance; or
And when the falling time t is less than the active speed regulation time threshold value td, starting the anti-falling protection circuit, and rapidly supplying oil to the bearing static pressure cavity through an energy accumulator group in the anti-falling protection circuit to provide buffer time tb for the oil supply of the active speed regulation link, wherein the buffer time tb is greater than the difference value between the falling time t and the active speed regulation time threshold value td.
2. The method for preventing the magnetic-liquid double suspension bearing from falling off according to claim 1, wherein the method comprises the following steps: the active speed regulation time threshold td is determined by simulating rotor drop for multiple times.
3. A magnetic-liquid double suspension bearing fall-prevention protection circuit of the method for preventing the magnetic-liquid double suspension bearing from falling according to claim 1 or 2, wherein the method comprises the following steps: each support loop of the magnetic-liquid double-suspension bearing hydrostatic support system is connected with an anti-falling protection loop in parallel; each anti-falling protection loop comprises an energy accumulator, an electromagnetic directional valve and an adjustable throttle valve which are sequentially connected in series;
the energy accumulator is connected with the gear pump, the asynchronous motor, the one-way valve, the pressure gauge and the oil tank in sequence to form an energy accumulator oil storage loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111071437.0A CN113803371B (en) | 2021-09-14 | 2021-09-14 | Method for preventing magnetic-liquid double-suspension bearing from falling and protection loop thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111071437.0A CN113803371B (en) | 2021-09-14 | 2021-09-14 | Method for preventing magnetic-liquid double-suspension bearing from falling and protection loop thereof |
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| CN113803371A true CN113803371A (en) | 2021-12-17 |
| CN113803371B CN113803371B (en) | 2022-05-10 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160138649A1 (en) * | 2014-11-18 | 2016-05-19 | Energy Recovery, Inc. | System and method for hydrostatic bearings |
| CN106499730A (en) * | 2016-11-15 | 2017-03-15 | 常州工学院 | A kind of magnetic levitation bearing system of short duration out of control after can realize the control method of settling flux |
| US20180172072A1 (en) * | 2015-05-27 | 2018-06-21 | Gree Green Refrigeration Technology Center Co., Ltd Of Zhuhai | Control Method and Control Device for Magnetic Bearing |
| CN109139691A (en) * | 2018-09-13 | 2019-01-04 | 哈尔滨电气股份有限公司 | A kind of control method for falling recovery suitable for vertical electromagnetic bearing rotor |
| CN112460146A (en) * | 2019-09-06 | 2021-03-09 | 北京亚之捷环保科技有限责任公司 | Active magnetic suspension rotor falling protection system |
-
2021
- 2021-09-14 CN CN202111071437.0A patent/CN113803371B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160138649A1 (en) * | 2014-11-18 | 2016-05-19 | Energy Recovery, Inc. | System and method for hydrostatic bearings |
| US20180172072A1 (en) * | 2015-05-27 | 2018-06-21 | Gree Green Refrigeration Technology Center Co., Ltd Of Zhuhai | Control Method and Control Device for Magnetic Bearing |
| CN106499730A (en) * | 2016-11-15 | 2017-03-15 | 常州工学院 | A kind of magnetic levitation bearing system of short duration out of control after can realize the control method of settling flux |
| CN109139691A (en) * | 2018-09-13 | 2019-01-04 | 哈尔滨电气股份有限公司 | A kind of control method for falling recovery suitable for vertical electromagnetic bearing rotor |
| CN112460146A (en) * | 2019-09-06 | 2021-03-09 | 北京亚之捷环保科技有限责任公司 | Active magnetic suspension rotor falling protection system |
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| CN113803371B (en) | 2022-05-10 |
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