Magnetic suspension water lubrication hybrid bearing

Abstract

The invention discloses a magnetic suspension water-lubricated hybrid bearing, which comprises a magnetic suspension bearing and a water-lubricated bearing, the magnetic suspension bearing comprises a stator core, a stator coil and an insulating pouring sealant, the water-lubricated bearing comprises a bushing and a bearing bush, and the magnetic suspension water-lubricated hybrid bearing also comprises an intelligent monitoring and control system consisting of a power amplifier, a controller, a displacement sensor and a circuit thereof; when the magnetic conductive metal material rotating shaft supported by the magnetic suspension bearing and the water lubricated bearing is in working conditions such as starting, stopping, low speed or overload, the controller controls the power amplifier to enable the magnetic suspension bearing to enter a working state to provide main bearing force for the rotating shaft, and friction and abrasion of the bearing bush are effectively reduced; when the rotating shaft is in a high-speed and stable working condition, the controller controls the power amplifier to reduce the current and the electromagnetic force of the magnetic suspension bearing, so that the supporting effect of the magnetic suspension bearing is weakened, the water-lubricated bearing is in a stable hydrodynamic lubrication stage, main bearing force is provided for the rotating shaft, and the power consumption of the magnetic suspension bearing is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of bearings, and in particular relates to a magnetic suspension water-lubricated hybrid bearing. Background Art

[0002] Water-lubricated bearings are fluid film lubricated bearings that use ambient water as the lubricating medium and support the rotating shaft with a water film generated by the dynamic pressure effect. They are widely used in equipment such as water pumps and ship propulsion systems. However, due to the low viscosity of the lubricating medium, the low linear speed of water-lubricated bearings during the start and stop phases of the rotating shaft makes it difficult to establish a water film, which is in mixed lubrication or even boundary lubrication, and water-lubricated bearings will produce greater friction and wear.

[0003] In addition, the support stiffness and support damping of water-lubricated bearings are low. When facing transient impacts, they cannot effectively limit the large displacement movement of the rotating shaft, which may cause the rotating shaft and the bearing to rub against each other. When facing steady-state excitation, they cannot effectively suppress vibration, which may cause the vibration acceleration and water acoustic radiation to exceed the standard.

[0004] Active magnetic bearings are actively controlled bearings that use controllable electromagnetic forces to support the rotating shaft without contact. Using a closed-loop control system and appropriate control algorithms, the bearing characteristics can be actively adjusted to actively suppress vibration and noise. However, since the stator coil needs to be continuously supplied with current, it has certain limitations for large-scale industrial applications or underwater unmanned vehicles and other power-sensitive application scenarios.

[0005] In addition, magnetic bearings rely on a closed-loop control system. Failure in any link will cause the shaft to come into direct contact with the stator, requiring additional bearings to provide protection in emergency situations. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a magnetic suspension water-lubricated hybrid bearing.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a magnetic suspension water-lubricated hybrid bearing, including a magnetic suspension bearing and a water-lubricated bearing formed as an integral whole by nesting in the radial direction, the magnetic suspension bearing belongs to an active magnetic suspension bearing, including a stator core formed by stacking silicon steel sheets, poles distributed along the inner circumference of the stator core, and stator coils wound on the poles, the inner side of the poles is arc-shaped, and the gaps between the stator core, the stator coil and the poles are filled with insulating potting glue, the water-lubricated bearing is fixed together by a bushing and a bearing bush by brazing or hot pressing; it also includes a power amplifier connected in series to the stator coil and a controller connected to the power amplifier, and a stator coil located outside the bearing bush. The power amplifier, controller, displacement sensor and their circuits constitute an intelligent monitoring and control system; when the magnetic metal material shaft supported by the magnetic suspension bearing and the water-lubricated bearing is in the starting, stopping, low speed or overload conditions, the controller controls the power amplifier to put the magnetic suspension bearing into the working state to provide the main bearing capacity for the shaft, effectively reducing the friction and wear of the bearing bush; when the shaft is in the high-speed and stable working condition, the controller controls the power amplifier to reduce the current of the magnetic suspension bearing, reduce the electromagnetic force, so that the supporting effect of the magnetic suspension bearing is weakened, and the water-lubricated bearing is in the stable fluid dynamic lubrication stage, which provides the main bearing capacity for the shaft and effectively reduces the power consumption of the magnetic suspension bearing.

[0008] In the magnetic suspension water-lubricated hybrid bearing, when the shaft starts, the controller controls the power amplifier to make the magnetic suspension bearing suck the shaft in the positive and negative directions of two orthogonal control directions, reads the measurement value of the displacement sensor, obtains the limit position of the shaft in the bearing shell, and while calculating the suspension center position, compares it with the limit position recorded in the controller log to obtain the wear amount of the water-lubricated bearing and predict the remaining service life.

[0009] In the magnetic suspension water-lubricated hybrid bearing, when the shaft starts, the controller controls the power amplifier to slowly increase the bias current to put the magnetic suspension bearing into working state, so as to prevent the shaft from suddenly hitting the bearing bush at high speed when floating.

[0010] The magnetic levitation water-lubricated hybrid bearing described above works in water containing impurities such as mud and sand. The controller continuously monitors the relative displacement of the rotating shaft and the bearing through a displacement sensor, determines the accumulation of impurities at the bearing, and makes intelligent decisions to squeeze out or avoid impurities by adjusting the center position of the rotating shaft suspension, thereby reducing friction and wear of the bearing.

[0011] In the magnetic suspension water-lubricated hybrid bearing, when the intelligent monitoring system detects that the rotating shaft is in a transient impact condition, the controller switches to an anti-impact control mode and adopts a high-rigidity control algorithm to effectively prevent the rotating shaft from hitting the bearing at high speed.

[0012] In the magnetic suspension water-lubricated hybrid bearing, when the shaft is overloaded or the control algorithm diverges, resulting in instability and rubbing against the bearing, the controller processes and analyzes the displacement state of the shaft through the displacement sensor in a short period of time. If it is determined that the shaft is in a continuous rubbing state, the output current of the power amplifier is disconnected, so that the magnetic suspension bearing exits the working state, and the water-lubricated bearing briefly provides the bearing capacity alone, effectively avoiding continuous impact on the bearing and relying on the water-lubricated bearing to stabilize the shaft again. Then the magnetic suspension bearing enters the working state again to provide support and vibration reduction effects.

[0013] In the magnetic suspension water-lubricated hybrid bearing, the outer diameter of the bushing is equal to the diameter of the inner arc of the pole of the stator core.

[0014] The magnetic suspension water-lubricated hybrid bearing has a bushing made of non-magnetic metal materials such as aluminum alloy or titanium alloy, and a bushing made of organic non-metal materials such as polyetheretherketone, inorganic non-metal materials such as ceramics, or non-magnetic metal materials such as tungsten carbide.

[0015] The beneficial effects of the present invention are as follows: the power amplifier, controller and displacement sensor of the present invention and their circuits constitute an intelligent monitoring and control system; when the rotating shaft is in the starting, stopping, low speed, overload and other working conditions, the intelligent control system controls the magnetic suspension bearing to provide the main bearing capacity; when the rotating shaft is in the high-speed and stable working condition, the intelligent control system reduces the current of the magnetic suspension bearing, and the water-lubricated bearing provides the main bearing capacity; the intelligent monitoring system performs extreme position measurement before each start-up to obtain the wear amount of the water-lubricated bearing and predict the remaining service life; the intelligent monitoring and control system can monitor the vibration displacement of the rotating shaft in real time, effectively reducing the vibration acceleration and water acoustic radiation; when the rotating shaft is impacted, the intelligent control system will switch to the anti-impact control mode, effectively avoiding the rotating shaft from hitting the water-lubricated bearing bush at high speed; the intelligent monitoring system judges the impurity accumulation at the water-lubricated bearing bush by continuously monitoring the displacement of the rotating shaft, and makes intelligent decisions to squeeze out or avoid impurities by adjusting the suspension center position. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the planar structure of the magnetic suspension bearing and the water lubricated bearing part of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0017] The reference numerals of the figures are: 1—stator core, 2—stator coil, 3—insulating potting compound, 4—bushing, 5—bearing shell, 6—power amplifier, 7—controller, 8—displacement sensor, 9—rotating shaft. DETAILED DESCRIPTION

[0018] Reference Figure 1 , Figure 2As shown, this example proposes a magnetic suspension water-lubricated hybrid bearing, the basic structure of which includes a magnetic suspension bearing and a water-lubricated bearing, and the two bearings are nested to form a whole.

[0019] The magnetic suspension bearing belongs to an active magnetic suspension bearing, including a stator core 1 formed by laminating silicon steel sheets, 8 poles distributed along the inner circumference of the stator core 1, and a stator coil 2 wound on the pole. The inner side of the pole is arc-shaped, and insulating potting glue 3 is filled between the stator core 1, the stator coil 2 and the pole. The water-lubricated bearing is composed of a bushing 4 and a bearing 5, which are fixed together by brazing or hot pressing; the outer diameter of the bushing 4 is equal to the diameter of the inner arc of the pole of the stator core 1. The bushing 4 is made of non-magnetic metal materials such as aluminum alloy or titanium alloy, and the bearing 5 is made of organic non-metallic materials such as polyetheretherketone, inorganic non-metallic materials such as ceramics, or non-magnetic metal materials such as tungsten carbide.

[0020] The power amplifier 6 connected to the stator coil 2, the controller 7 connected to the power amplifier 6, and the displacement sensor 8 located at the bearing 5 and its circuit constitute an intelligent monitoring and control system.

[0021] When the magnetic metal material rotating shaft 9 supported by the magnetic suspension bearing and the water-lubricated bearing is in the starting, stopping, low speed or overload conditions, the intelligent monitoring and control system controls the power amplifier 6 to put the magnetic suspension bearing into the working state to provide the main bearing capacity for the rotating shaft 9, and effectively reduce the friction and wear of the bearing 5; when the rotating shaft 9 is in the high-speed and stable working condition, the controller 7 controls the power amplifier 6 to reduce the current of the magnetic suspension bearing and the electromagnetic force, so that the supporting effect of the magnetic suspension bearing is weakened, and the water-lubricated bearing is in the stable fluid dynamic lubrication stage, which provides the main bearing capacity for the rotating shaft 9 and effectively reduces the power consumption of the magnetic suspension bearing.

[0022] In actual work, the inevitable residual imbalance of the rotating shaft 9 will cause unbalanced vibration. The propeller or impeller that may be connected to the output end of the rotating shaft 9 may also produce blade frequency vibration. Therefore, the intelligent monitoring and control system can monitor the vibration displacement of the rotating shaft 9 in real time, and perform active vibration suppression to effectively reduce vibration acceleration and underwater acoustic radiation.

[0023] When the shaft 9 starts, the controller 7 controls the power amplifier 6 to make the magnetic bearing suck the shaft 9 in the positive and negative directions of two orthogonal control directions, read the measurement value of the displacement sensor 8, obtain the limit position of the shaft 9 in the bearing 5, and while calculating the suspension center position, compare it with the limit position recorded in the log of the controller 7 to obtain the wear amount of the water-lubricated bearing and predict the remaining service life. When the shaft 9 starts, the controller 7 controls the power amplifier 6 to slowly increase the bias current to make the magnetic bearing enter the working state to prevent the shaft 9 from suddenly hitting the water-lubricated bearing bearing 5 at high speed when floating.

[0024] The magnetically levitated water-lubricated hybrid bearing works in water containing impurities such as mud and sand. The controller 7 continuously monitors the relative displacement between the rotating shaft 9 and the bearing 5 through the displacement sensor 8, determines the accumulation of impurities at the bearing 5, and adjusts the suspension center position of the rotating shaft 9 to make intelligent decisions to squeeze out or avoid impurities, thereby reducing the friction and wear of the bearing 5.

[0025] When the intelligent monitoring system detects that the rotating shaft 9 is in a transient impact condition, the controller 7 switches to the anti-impact control mode and the anti-impact control law, and adopts a high-rigidity control algorithm to effectively prevent the rotating shaft 9 from hitting the bearing 5 at high speed.

[0026] The above embodiments are only illustrative of the principles and effects of the present invention, as well as some embodiments of its application. For those skilled in the art, several modifications and improvements may be made without departing from the creative concept of the present invention, and all of these belong to the protection scope of the present invention.

Claims

1. A magnetic suspension water-lubricated hybrid bearing, characterized in that: The invention comprises a magnetic suspension bearing and a water-lubricated bearing which are radially nested into an integral whole. The magnetic suspension bearing comprises a stator core (1) formed by laminating silicon steel sheets, poles distributed along the inner circumference of the stator core (1), and stator coils (2) wound on the poles. An insulating potting glue (3) is filled between the stator core (1), the stator coil (2), and the poles. The water-lubricated bearing comprises a bushing (4) and a bearing bushing (5). The invention also comprises a power amplifier (6) connected to the stator coil (2), a controller (7) connected to the power amplifier (6), and a stator coil (2) located on the bearing bushing. (5) a displacement sensor (8) outside; when the magnetic metal material rotating shaft (9) supported by the magnetic suspension bearing and the water-lubricated bearing is in a starting, stopping, low-speed or overloaded working condition, the controller (7) controls the power amplifier (6) to put the magnetic suspension bearing into a working state to provide the main bearing capacity for the rotating shaft (9), thereby reducing the friction and wear of the bearing bush (5); when the rotating shaft (9) is in a high-speed, stable working condition, the controller (7) controls the power amplifier (6) to weaken the support of the magnetic suspension bearing, and the water-lubricated bearing provides the main bearing capacity for the rotating shaft (9), thereby reducing the power consumption of the magnetic suspension bearing.

2. A magnetic suspension water-lubricated hybrid bearing according to claim 1, characterized in that: When the rotating shaft (9) is started, the controller (7) controls the power amplifier (6) to cause the magnetic bearing to suck the rotating shaft (9) in two orthogonal directions, and reads the measurement value of the displacement sensor (8) to obtain the limit position of the rotating shaft (9) in the bearing shell (5). The limit position is compared with the limit position recorded by the controller (7) to obtain the wear amount of the water-lubricated bearing.

3. The magnetic suspension water-lubricated hybrid bearing according to claim 1, characterized in that: When the rotating shaft (9) is started, the controller (7) controls the power amplifier (6) to slowly increase the bias current so that the magnetic suspension bearing enters a working state, thereby preventing the rotating shaft (9) from colliding with the water-lubricated bearing bushing (5) at high speed when floating.

4. A magnetic suspension water-lubricated hybrid bearing according to claim 1, 2 or 3, characterized in that: The controller (7) monitors the relative displacement between the rotating shaft (9) and the bearing bush (5) through the displacement sensor (8), and adjusts the suspension center position of the rotating shaft (9) to squeeze out or avoid impurities, thereby reducing the friction and wear of the bearing bush (5).

5. The magnetic suspension water-lubricated hybrid bearing according to claim 4, characterized in that: When the rotating shaft (9) is in a transient impact condition, the controller (7) switches to an anti-impact control mode to prevent the rotating shaft (9) from colliding with the bearing bush (5) at high speed.

6. The magnetic suspension water-lubricated hybrid bearing according to claim 5, characterized in that: The outer diameter of the bushing (4) is equal to the diameter of the arc inside the pole.

7. The magnetic suspension water-lubricated hybrid bearing according to claim 5, characterized in that: The bushing (4) is made of a non-magnetic metal material, and the bearing bush (5) is made of an organic non-metal material, an inorganic non-metal material or a non-magnetic metal material.

8. The magnetic suspension water-lubricated hybrid bearing according to claim 7, characterized in that: The non-magnetic metal material is aluminum alloy or titanium alloy, the organic non-metal material is polyetheretherketone, the inorganic non-metal material is ceramic, and the non-magnetic metal material is tungsten carbide.

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