CN109236847A - The control system and control method of intelligent hydrodynamic bearing - Google Patents
The control system and control method of intelligent hydrodynamic bearing Download PDFInfo
- Publication number
- CN109236847A CN109236847A CN201811266644.XA CN201811266644A CN109236847A CN 109236847 A CN109236847 A CN 109236847A CN 201811266644 A CN201811266644 A CN 201811266644A CN 109236847 A CN109236847 A CN 109236847A
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- Prior art keywords
- bearing
- rotor
- bearing body
- intelligence
- actuator
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Classifications
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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
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
-
- 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
- F16N—LUBRICATING
- F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
- F16N29/02—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems for influencing the supply of lubricant
-
- 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
- F16N—LUBRICATING
- F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
- F16N7/38—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with a separate pump; Central lubrication systems
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Support Of The Bearing (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Provide the control system and control method of intelligent hydrodynamic bearing.The control system includes sensor, actuator and control unit, sensor is used to monitor at least one operating parameter of bearing body or rotor and the operating parameter monitored is sent to control unit, actuator is used to supply lubricating fluid to bearing body, and control unit is used for the working condition via actuator control bearing body.When the revolving speed of rotor is less than the performance load of predetermined speed or bearing body or rotor greater than predetermined load, actuator supplies lubricating fluid to bearing body, so that intelligent hydrodynamic bearing works as hydrodynamic bearing.It is greater than or equal to predetermined speed in the revolving speed of rotor, and when the performance load of bearing body or rotor is less than or equal to predetermined load, actuator stops supplying lubricating fluid to bearing body, so that intelligent hydrodynamic bearing is as aero dynamic bearing work.
Description
Technical field
The present invention relates to technical field of bearings, and in particular to a kind of control system and control method of intelligence hydrodynamic bearing.
Background technique
Hydrodynamic bearing is a kind of using dynamic pressure fluid as the sliding bearing of lubricant medium, is divided into hydrodynamic bearing and gas is dynamic
Last item is held.Since frictional resistance is small, bearing capacity is strong and structure is simple, hydrodynamic bearing has a wide range of applications in the industry.
Hydrodynamic bearing is with liquid (such as lubricating oil) for lubricant, and bearing capacity is stronger, however axle journal linear velocity has
Limit, limits it in the application of high engine speed range.Aero dynamic bearing is using gas as lubricant, and friction loss is minimum, so
And there is a problem of low speed abrasion and stability difference.
Summary of the invention
The invention proposes a kind of intelligent hydrodynamic bearing, aero dynamic bearing is had both based on active control and liquid is dynamic
The advantages of last item is held reduces the abrasion of axle journal and bearing shell using hydrodynamic lubrication when rotor is at low speed；When rotor is with high speed
When operating, friction loss and heating power are reduced using gas lubrication；When bearing body or rotor load increase, using liquid
Lubrication improves bearing load carrying capacity and damping characteristic.
Transformation of the intelligent hydrodynamic bearing between 2 kinds of working methods of gas lubrication and hydrodynamic lubrication is depended on to rotor-axis
The accurate judgement of working state of system and the accurate adjusting of liquid-supplying system (actuator) liquid supply rate are held, the control of bearing is to bearing
Performance plays an important role.
The invention also provides the control systems and control method of a kind of intelligent hydrodynamic bearing, and the purpose is to realize that intelligence is dynamic
The active control that last item is held.Rotor-bearing system state and the optimal working method of bearing are judged by sensor signal, pass through control
Liquid supply rate processed realizes that bearing body converts in two kinds of working methods of gas lubrication and hydrodynamic lubrication, to make bearing always with most
Good working method operation, realizes high revolving speed, low abrasion and overstable working characteristics.
To achieve the above object, the present invention can use following proposal.
A kind of control system of intelligence hydrodynamic bearing comprising sensor, actuator and control unit, the sensor are used
Join at least one operating parameter of monitoring bearing body or the rotor supported by the bearing body and by the operation monitored
Number is sent to described control unit, at least one described operating parameter at least characterize the rotor revolving speed or it is described at least
One operating parameter at least characterizes the performance load of the bearing body or the rotor, and the actuator is used for the bearing
Ontology supplies lubricating fluid, and described control unit is used to control the working condition of the bearing body via the actuator, makes
:
It is greater than in the performance load that the revolving speed of the rotor is less than predetermined speed or the bearing body or the rotor
When predetermined load, the actuator supplies lubricating fluid to the bearing body, so that the intelligence hydrodynamic bearing is as liquid
Hydrodynamic bearing work,
It is greater than or equal to the predetermined speed, and the fortune of the bearing body or the rotor in the revolving speed of the rotor
When row load is less than or equal to the predetermined load, the actuator stops supplying lubricating fluid to the bearing body, so that
The intelligence hydrodynamic bearing works as aero dynamic bearing.
In at least one embodiment, the actuator includes:
Electric oil pump is used to lubricating fluid being supplied to the bearing body via pipeline；And
Regulator is used for the command signal according to described control unit, and the fluid pressure in the pipeline is adjusted
To setting value.
In at least one embodiment, described control unit is connected to the electric oil pump and controls the electric oil pump
Working condition, described control unit is also connected to the regulator and adjusted in the pipeline with controlling the regulator
The pressure of lubricating fluid.
In at least one embodiment, the sensor includes for monitoring for lubricating fluid to be supplied to the axis
The pressure sensor of the fluid pressure in the pipeline of ontology is held, the pressure sensor is connected to described control unit and will monitoring
To pressure data be sent to described control unit.
In at least one embodiment, the sensor includes speed probe and/or displacement sensor.
In at least one embodiment, the bearing body includes bearing block and bearing shell, and the bearing shell is used to support work
For the shaft of the rotor,
The speed probe is used to monitor the revolving speed of the shaft, and institute's displacement sensors are for monitoring the shaft
Radial displacement.
In at least one embodiment, the sensor include 90 degree of circumferentially spaced along the shaft arrange
Two displacement sensors, described two displacement sensors are used to determine the position in the axle center of the shaft.
A kind of control method of intelligence hydrodynamic bearing, uses control system according to the present invention.
In at least one embodiment, the control method includes the following steps:
When the rotor will start or just start turning, described control unit controls the actuator to the bearing
Ontology supplies lubricating fluid, so that the intelligence hydrodynamic bearing works as hydrodynamic bearing；
The sensor monitor the rotor revolving speed reach the working speed of aero dynamic bearing after, the control
Unit, which controls the actuator, to be stopped supplying lubricating fluid to the bearing body, so that the intelligence hydrodynamic bearing is as gas
Hydrodynamic bearing work；And
When the sensor monitors the bearing body or rotor load mutation or unstability, described control unit
It controls the actuator and supplies lubricating fluid to the bearing body, so that the intelligence hydrodynamic bearing is as hydrodynamic bearing
Work.
In at least one embodiment, the control method includes the following steps:
When the sensor monitors the working speed of the revolving speed of the rotor lower than aero dynamic bearing and is greater than zero,
Described control unit controls the actuator and supplies lubricating fluid to the bearing body, so that the intelligence hydrodynamic bearing conduct
Hydrodynamic bearing work；And
When the sensor monitors the revolving speed of the rotor equal to zero, described control unit controls the actuator and stops
Only lubricating fluid is supplied to the bearing body.
In bearing body in a manner of gas lubrication in operational process, control unit is according to the signal of displacement sensor to shaft
State is monitored, and when judging shaft sudden load change or unstability risk occur, opening pump is bearing body feed flow, and passes through tune
Pressure device adjusts the liquid supply pressure in pipeline, controls bearing body liquid supply rate, improves the bearer properties of bearing body, improves shaft
The stability of work.
When control unit judges shaft steady operation and load is in a certain range, pump is closed, bearing body is with gas
Lubricating system operation.
When control unit judges that shaft will stall or revolving speed is lower than a threshold value, pump is opened, bearing body is with liquid
Lubricating system operation is until revolving speed is higher than limit value or shaft stalling again.
The control system of intelligent hydrodynamic bearing and the beneficial effect of control method of the invention include: by shaft revolving speed and
The optimal working method of displacement signal comprehensive descision bearing body or shaft state and bearing, makes bearing body accurately and in time
It is converted between 2 kinds of working methods of gas lubrication and hydrodynamic lubrication, it is ensured that bearing with the operation of optimal working method, reduces energy always
Consumption reduces abrasion, extends the service life, ensures to stablize；By the fluid pressure in closed-loop control pipeline, liquid supply rate is accurately adjusted, it is real
Loading ability of bearing characteristic is adjustable under the conditions of existing hydrodynamic lubrication.
Detailed description of the invention
Fig. 1 is the system schematic of intelligent hydrodynamic bearing according to embodiment of the present invention.
Fig. 2 is the structural schematic diagram of the bearing body of the intelligent hydrodynamic bearing in Fig. 1.
Fig. 3 is the flow chart of the control method of intelligent hydrodynamic bearing according to embodiment of the present invention.
Description of symbols
101 bearing bodies, 102 shafts, 103 liquid memories, 104 pumps, 105 filters, 106 regulators, 107 pressure
Sensor, 108 speed probes, 109 displacement sensors, 110 control units；
201 bearing blocks, 202 bearing shells, 203 liquid tanks, 204 confession fluid apertures.
Specific embodiment
Exemplary embodiments of the present invention are described with reference to the accompanying drawings.It should be appreciated that these specific descriptions are only used for
How teaching those skilled in the art implement the present invention, rather than all feasible modes that exhaustion is of the invention, without in
It limits the scope of the invention.
As depicted in figs. 1 and 2, an embodiment of the invention provides a kind of intelligent hydrodynamic bearing, the intelligence dynamic pressure shaft
It contracts and includes bearing body 101, liquid-supplying system and control system.
Bearing body 101 includes bearing block 201 and bearing shell 202.The liquid of circumferentially extending is formed in the inner peripheral surface of bearing shell 202
Body tank (for example, oil groove) 203.Bearing block 201 and bearing shell 202 be formed be connected to liquid tank 203 confession fluid apertures (for example,
Oilhole) 204, for lubricating fluid (such as lubricating oil) to be introduced liquid tank 203.Bearing block 201 is stationary end, can be passed through
Such as bolt is fixed to the fuselage of rotating machinery, bearing block 201 is used for fixing bearing ontology 101 and spring bearing load.Bearing shell
202 can be fixed on bearing block 201 by rigidity or resilient support.
Liquid-supplying system includes liquid memory (for example, fuel tank) 103 and sequentially connected pump 104, filter 105, pressure regulation
Device 106 and pressure sensor 107.When liquid-supplying system works, pressure is generated by pump 104, filters and adjusts through cleaner 105
After 106 pressure regulation of pressure device, liquid enters confession fluid apertures 204 by pipeline.Confession fluid apertures 204 have throttling action, by adjusting pipeline
The adjusting to 101 liquid supply rate of bearing body may be implemented in the pressure of interior liquid.The liquid for flowing through confession fluid apertures 204 is stored to liquid
Tank 203 enters the movement pair surface being made of bearing shell 202 and shaft 102 under the rotary action of shaft 102, realizes lubrication
And support function.
The control system of the intelligent hydrodynamic bearing of present embodiment includes sensor, actuator and control unit 110.
Sensor includes speed probe 108, displacement sensor 109 and pressure sensor 107.Speed probe 108 can
To measure the revolving speed of shaft 102 using the signal teeth cooperation on hall-effect speed sensor, with shaft 102.Displacement sensor
109 can use eddy current displacement sensor, and 2 mutually orthogonal displacement sensors 109 are installed near the axle journal of shaft 102
90 degree of circumferentially spaced of the position along shaft 102, to determine the position in the axle center of shaft 102.Pressure sensor 107 can be adopted
The liquid of bearing body 101 is supplied to determination for measuring the lubricating fluid pressure in pipeline with piezoresistive pressure sensor
Amount.
Actuator includes pump 104 and regulator 106.Pump 104 can use electric oil pump, control it by relay and open
It opens and closes, for being in due course that bearing body 101 provides lubricating fluid.Regulator 106 can use automatically controlled pressure regulator valve, according to
Fluid pressure in pipeline is adjusted to setting value by the command signal from control unit 110.
Control unit 110 may include the portions such as signal acquisition module, driving output module, communication module and microprocessor
Point.Signal acquisition module is used to acquire the signal of sensor, and driving output module is used for controlling actuator work, communication module
It is communicated in other associated control elements, microprocessor is used to control the program that each module executes setting.
Fig. 3 shows the control method of intelligent hydrodynamic bearing according to embodiment of the present invention.
102 prestart of shaft, control unit 110 are opened pump 104, according to the signal of pressure sensor 107, are filled by pressure regulation
It sets 106 and the fluid pressure in pipeline is adjusted to preset value, provide moderate lubrication liquid for bearing body 101；Shaft 102 starts
Bearing body 101 is run in a manner of hydrodynamic lubrication when revolving speed is lower in the process.
According to the signal of speed probe 108, when control unit 110 monitors that 102 revolving speed of shaft reaches gas dynamic pressure axis
When the lowest continuous speed with load held, pump 104 is closed, stops feed flow, the lubricating fluid in bearing body 101 passes through end leakage
(for example, returning to liquid memory 103), bearing body 101 are run in a manner of gas lubrication.The minimum stabilization of aero dynamic bearing
Working speed is related with the factors such as journal size and shaft load, is usually obtained by test test in advance minimum under maximum load
Steady operation revolving speed, and as in the memory of threshold value write control unit 110.
In bearing body 101 in a manner of gas lubrication in operational process, control unit 110 is according to displacement sensor 109
Signal is monitored the state of shaft 102, and when judging the mutation of shaft load or shaft there are when unstability risk, opening pumps 104
For 101 feed flow of bearing body, and the liquid supply pressure in pipeline is adjusted to preset value by regulator 106, controlled to bearing sheet
The liquid supply rate of body 101, bearing body 101 are run in a manner of hydrodynamic lubrication, improve the bearer properties of bearing body 101, are improved and are turned
The stability that axis 102 works.
When control unit 110 judges 102 steady operation of shaft and load is in a certain range, pump 104, bearing sheet are closed
Body 101 is run in a manner of gas lubrication.
When control unit 110 judge shaft 102 will stall or revolving speed be lower than aero dynamic bearing minimum steady operation
When revolving speed, pump 104 is opened, is 101 feed flow of bearing body, the liquid supply pressure in pipeline is adjusted to preset value, controls to bearing sheet
The liquid supply rate of body 101, bearing body 101 are run in a manner of hydrodynamic lubrication, until the revolving speed of shaft 102 reaches gas dynamic pressure again
The lowest continuous speed with load or stalling of bearing.More specifically, the revolving speed in shaft 102 reaches aero dynamic bearing most again
When low steady operation revolving speed, closing pump 104 runs bearing body 101 in a manner of gas lubrication；When shaft 102 stalls, close
Close pump 104.
It should be appreciated that above embodiment is merely exemplary, it is not used in the limitation present invention.Those skilled in the art can be with
Various modifications and changes are made to above embodiment under the teachings of the present invention, without departing from the scope of the present invention.
(1) for example, intelligent hydrodynamic bearing of the invention be not limited to support shaft 102, can also support as rotor its
Its component.
(2) not every sensor (107,108,109) is all that necessary, of the invention intelligent hydrodynamic bearing can be set
Set less or more sensor.Furthermore, it is possible to send signal from other devices or sensor to control unit 110, control is single
The sensor signal received or control signal can also be sent to other devices and (including but not limited to show dress by member 110
It sets).
(3) it is made merely for the purpose of explanation about liquid-supplying system and control system (and the sensor of control system
And actuator) division, can also to component each in Fig. 1 carry out other forms division or grouping, it is this division or grouping not
For limiting the scope of the invention.
Claims (10)
1. a kind of control system of intelligence hydrodynamic bearing, which is characterized in that it includes sensor, actuator and control unit
(110), the sensor is used to monitor at least the one of bearing body (101) or the rotor by the bearing body (101) support
The operating parameter monitored is simultaneously sent to described control unit (110) by a operating parameter, at least one described operating parameter is extremely
The revolving speed or at least one described operating parameter for characterizing the rotor less at least characterize the bearing body (101) or described
The performance load of rotor, the actuator are used to supply lubricating fluid, described control unit to the bearing body (101)
(110) for controlling the working condition of the bearing body (101) via the actuator, so that:
It is big in the performance load that the revolving speed of the rotor is less than predetermined speed or the bearing body (101) or the rotor
When predetermined load, the actuator supplies lubricating fluid to the bearing body (101), so that the intelligence dynamic pressure shaft is made
It works for hydrodynamic bearing,
It is greater than or equal to the predetermined speed in the revolving speed of the rotor, and the bearing body (101) or the rotor
When performance load is less than or equal to the predetermined load, the actuator stops supplying lubricating fluid to the bearing body (101)
Body, so that the intelligence hydrodynamic bearing works as aero dynamic bearing.
2. the control system of intelligence hydrodynamic bearing according to claim 1, which is characterized in that the actuator includes:
Electric oil pump (104) is used to lubricating fluid being supplied to the bearing body (101) via pipeline；And
Regulator (106), is used for the command signal according to described control unit (110), by the liquid pressure in the pipeline
Power is adjusted to setting value.
3. the control system of intelligence hydrodynamic bearing according to claim 2, which is characterized in that
Described control unit (110) is connected to the electric oil pump (104) and controls the work shape of the electric oil pump (104)
State, described control unit (110) are also connected to the regulator (106) to control described in the regulator (106) adjusting
The pressure of lubricating fluid in pipeline.
4. the control system of intelligence hydrodynamic bearing according to any one of claim 1 to 3, which is characterized in that
The sensor includes for monitoring the liquid in the pipeline for lubricating fluid to be supplied to the bearing body (101)
The pressure sensor (107) of pressure, the pressure sensor (107) are connected to described control unit (110) and will monitor
Pressure data is sent to described control unit (110).
5. the control system of intelligence hydrodynamic bearing according to any one of claim 1 to 3, which is characterized in that
The sensor includes speed probe (108) and/or displacement sensor (109).
6. the control system of intelligence hydrodynamic bearing according to claim 5, which is characterized in that
The bearing body (101) includes bearing block (201) and bearing shell (202), and the bearing shell (202) is used to support as described
The shaft (102) of rotor,
The speed probe (108) is used to monitor the revolving speed of the shaft (102), and institute's displacement sensors (109) are for supervising
Survey the radial displacement of the shaft (102).
7. the control system of intelligence hydrodynamic bearing according to claim 6, which is characterized in that
The sensor includes two displacement sensors (109) arranged along 90 degree of ground of circumferentially spaced of the shaft (102),
Described two displacement sensors (109) are used to determine the position in the axle center of the shaft (102).
8. a kind of control method of intelligence hydrodynamic bearing, uses control system described in any one of any one of claims 1 to 77.
9. the control method of intelligence hydrodynamic bearing according to claim 8, which is characterized in that the control method includes such as
Lower step:
When the rotor will start or just start turning, described control unit (110) controls the actuator to the axis
Ontology (101) supply lubricating fluid is held, so that the intelligence hydrodynamic bearing works as hydrodynamic bearing；
The sensor monitor the rotor revolving speed reach the working speed of aero dynamic bearing after, described control unit
(110) it controls the actuator to stop supplying lubricating fluid to the bearing body (101), so that the intelligence dynamic pressure shaft is made
For aero dynamic bearing work；And
When the sensor monitors the bearing body (101) or rotor load mutation or unstability, the control is single
First (110) control the actuator and supply lubricating fluid to the bearing body (101), so that the intelligence hydrodynamic bearing conduct
Hydrodynamic bearing work.
10. the control method of intelligent hydrodynamic bearing according to claim 8 or claim 9, which is characterized in that the control method packet
Include following steps:
It is described when the sensor monitors the working speed of the revolving speed of the rotor lower than aero dynamic bearing and is greater than zero
Control unit (110) controls the actuator and supplies lubricating fluid to the bearing body (101), so that the intelligence dynamic pressure shaft
It makes as hydrodynamic bearing work；And
When the sensor monitors the revolving speed of the rotor equal to zero, described control unit (110) controls the actuator
Stop supplying lubricating fluid to the bearing body (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811266644.XA CN109236847B (en) | 2018-10-29 | 2018-10-29 | Control system and control method of intelligent dynamic pressure bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811266644.XA CN109236847B (en) | 2018-10-29 | 2018-10-29 | Control system and control method of intelligent dynamic pressure bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109236847A true CN109236847A (en) | 2019-01-18 |
| CN109236847B CN109236847B (en) | 2020-05-22 |
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ID=65078780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811266644.XA Active CN109236847B (en) | 2018-10-29 | 2018-10-29 | Control system and control method of intelligent dynamic pressure bearing |
Country Status (1)
| Country | Link |
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| CN (1) | CN109236847B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1721716A (en) * | 2004-07-17 | 2006-01-18 | 任连杰 | Structural approach of a transmission stable hydraulic support |
| KR20090041162A (en) * | 2007-10-23 | 2009-04-28 | 한국과학기술연구원 | An airfoil-magnetic hybrid bearing and a control system thereof |
| EP2626577A1 (en) * | 2012-02-10 | 2013-08-14 | Siemens Aktiengesellschaft | Method for controlling a wind turbine and wind turbine |
| CN107989899A (en) * | 2017-12-13 | 2018-05-04 | 哈尔滨理工大学 | A kind of pump oil pressure automatic adjustable hydrodynamic journal liquid polymers oil pumping device |
| CN208089766U (en) * | 2018-04-13 | 2018-11-13 | 广州航海学院 | A kind of bearing arrangement based on sinking support |
-
2018
- 2018-10-29 CN CN201811266644.XA patent/CN109236847B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1721716A (en) * | 2004-07-17 | 2006-01-18 | 任连杰 | Structural approach of a transmission stable hydraulic support |
| KR20090041162A (en) * | 2007-10-23 | 2009-04-28 | 한국과학기술연구원 | An airfoil-magnetic hybrid bearing and a control system thereof |
| EP2626577A1 (en) * | 2012-02-10 | 2013-08-14 | Siemens Aktiengesellschaft | Method for controlling a wind turbine and wind turbine |
| CN107989899A (en) * | 2017-12-13 | 2018-05-04 | 哈尔滨理工大学 | A kind of pump oil pressure automatic adjustable hydrodynamic journal liquid polymers oil pumping device |
| CN208089766U (en) * | 2018-04-13 | 2018-11-13 | 广州航海学院 | A kind of bearing arrangement based on sinking support |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109236847B (en) | 2020-05-22 |
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