Magnetofluid bearing with self-sensing function

Abstract

The utility model provides a magnetofluid bearing with a self-sensing function, which is characterized in that the outer circle of a long magnetic conductive steel cylinder is matched with the aperture of a steel cylinder accommodating hole, and the central aperture of the long magnetic conductive steel cylinder is matched with a magnetic conductive shaft; the coil is wound on the coil framework; the coil framework wound with the coil is embedded into the long magnetic conductive steel cylinder; the central aperture of the coil framework is matched with the magnetic conductive shaft; the short magnetic conductive steel cylinder is embedded into the long magnetic conductive steel cylinder and is pressed on the coil framework; the central aperture of the short magnetic conductive steel cylinder is matched with the magnetic conductive shaft; two ends of a coil wound on the coil framework penetrate out of the coil outlet and are electrically connected with the circuit control part; a matched magnetic conductive shaft penetrates through the central aperture of the short magnetic conductive steel cylinder, the central aperture of the coil framework, the central aperture of the long magnetic conductive steel cylinder and the shaft hole of the bearing seat and is rotatably connected with the bearing seat. The magnetic fluid bearing has the advantages that the internal viscosity and damping of the magnetic fluid bearing can be changed, and the purposes of vibration reduction and damping controllability are achieved.

Description

Technical Field

[0001] The utility model relates to a magnetic fluid bearing with a self-sensing function. Background Art

[0002] There are many types of bearings according to their functions, and magnetic fluid bearings are one of them. In normal working environments, sliding bearings are mainly used in high-speed, heavy-load mechanical fields. Most of the existing bearings with vibration reduction functions are passive vibration reduction bearings, which mainly achieve vibration reduction functions by increasing the damping force. However, with the rapid development of modern industry, higher requirements are also placed on the performance of mechanical equipment

[10] . The working environment is more complex and changeable, and higher requirements are also placed on the precision and stability of mechanical work. Researchers have begun to develop various bearings with active vibration reduction, mainly by applying force to the bearing seat to improve the load capacity of the bearing seat and provide a greater radial force, thereby achieving the effect of suppressing rotor vibration. The existing bearings with active vibration reduction functions are mainly the following: active vibration reduction hydraulic bearings, active magnetic levitation bearings and electromagnetic bearings.

[0003] In recent years, magnetic fluid bearings (MFBs), a novel type of semi-active, controllable, and vibration-damping bearing, have attracted significant research interest and are widely used in cutting-edge technology fields such as aerospace, advanced weaponry, and satellites. Existing MFBs utilize permanent magnets to generate a magnetic field. Therefore, the magnetic field strength can only be adjusted by modifying the permanent magnets, making the viscosity and damping of the magnetic fluid within them difficult to alter. Utility Model Content

[0004] The utility model provides a magnetic fluid bearing with a self-sensing function, which can change the internal viscosity and damping of the magnetic fluid bearing to achieve the purpose of vibration reduction and controllable damping, thereby overcoming the defects of the prior art.

[0005] The utility model provides a magnetic fluid bearing with a self-sensing function, comprising a bearing seat 5, a long magnetic steel cylinder 9, a coil skeleton 4, a coil 10, and a short magnetic steel cylinder 11; the bearing seat 5 has an axial hole 51 in the center, and a steel cylinder receiving hole 52 at one end, and the two are coaxially arranged; a coil outlet 3 is provided on the side wall of the bearing seat 5 on one side of the steel cylinder receiving hole 52, and a magnetorheological fluid hole 6 is provided on the side wall on the other side; the outer circle of the long magnetic steel cylinder 9 matches the aperture of the steel cylinder receiving hole 52, and the central aperture of the long magnetic steel cylinder 9 matches the magnetic axis 13; the coil 10 is wound on the coil skeleton 4; the winding The coil skeleton 4 with the coil 10 is embedded in the long magnetic steel cylinder 9; the central aperture of the coil skeleton 4 matches the magnetic axis 13; the short magnetic steel cylinder 11 is embedded in the long magnetic steel cylinder 9 and pressed on the coil skeleton 4; the central aperture of the short magnetic steel cylinder 11 matches the magnetic axis 13; the two ends of the coil 10 wound on the coil skeleton 4 pass through the coil outlet 3 and are electrically connected to the circuit control component; the matching magnetic axis 13 passes through the central aperture of the short magnetic steel cylinder 11, the central aperture of the coil skeleton 4, the central aperture of the long magnetic steel cylinder 9, and the axial hole 51 of the bearing seat 5, and is rotatably connected to the bearing seat 5.

[0006] Furthermore, the utility model provides a magnetic fluid bearing with a self-sensing function, which may also have the following characteristics: the other end of the bearing seat 5 has a spring accommodating hole 53, and the spring accommodating hole 53 is coaxially arranged with the shaft hole 51.

[0007] Furthermore, the utility model provides a magnetic fluid bearing with a self-sensing function, which may also have the following characteristics: the magnetorheological fluid hole 6 is located on the side wall where the spring accommodating hole 53 is located; and the matching magnetic conductive shaft 13 also passes through the spring accommodating hole 53.

[0008] Furthermore, the utility model provides a magnetic fluid bearing with a self-sensing function, which may also have the following characteristics: it also includes a pressure cover 2; the outer diameter of the pressure cover 2 is interference fit with the steel cylinder accommodating hole 52, and is pressed on the end face of one side of the long magnetic steel cylinder 9 and the short magnetic steel cylinder 11, fixing the two to the bearing seat 5; the matching magnetic shaft 13 also passes through the inner hole of the pressure cover 2.

[0009] Furthermore, the utility model provides a magnetic fluid bearing with self-sensing function, which may also have the following characteristics: it also includes: two springs 12; one spring 12 is sleeved on the magnetic shaft 13 located at the inner hole position of the pressure cover 2; the other spring 12 is sleeved on the magnetic shaft 13 located at the spring accommodating hole 53.

[0010] Furthermore, the utility model provides a magnetic fluid bearing with self-sensing function, which may also have the following characteristics: two end covers 8 are configured at both ends of the bearing seat 5; the two end covers 8 are respectively pressed on both sides of the two springs 12 and are fixedly connected to the bearing seat 5.

[0011] Furthermore, the utility model provides a magnetic fluid bearing with a self-sensing function, which may also have the following characteristics: an O-ring 1 and a mechanical seal 14 are provided at the position where the bearing seat 5 is connected to the end cover 8. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the structure of a magnetic fluid bearing with self-sensing function in an embodiment.

[0013] Figure 2 3 is a practical application principle diagram of a magnetic fluid bearing with self-sensing function in an embodiment. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] Example

[0016] In this embodiment, the magnetic fluid bearing with self-sensing function includes: a bearing seat 5, a long magnetic steel cylinder 9, a coil skeleton 4, a coil 10, a short magnetic steel cylinder 11, and a pressure cover 2.

[0017] The bearing seat 5 has an axial hole 51 at its center, a steel cylinder receiving hole 52 at one end, and a spring receiving hole 53 at the other end, all coaxially arranged. The sidewall of the bearing seat 5 where the steel cylinder receiving hole 52 is located has a coil outlet 3, and the sidewall where the spring receiving hole 53 is located has a magnetorheological fluid hole 6.

[0018] The outer diameter of the long magnetic steel cylinder 9 matches the aperture of the steel cylinder accommodating hole 52 , and the central aperture of the long magnetic steel cylinder 9 matches the magnetic axis 13 .

[0019] The coil 10 is wound on the coil bobbin 4 ; the coil bobbin 4 with the coil 10 wound thereon is embedded in the long magnetic steel cylinder 9 ; the central aperture of the coil bobbin 4 matches the magnetic axis 13 .

[0020] The short magnetic steel cylinder 11 is embedded in the long magnetic steel cylinder 9 and pressed on the coil skeleton 4 ; the central aperture of the short magnetic steel cylinder 11 matches the magnetic axis 13 .

[0021] Both ends of the coil 10 wound on the coil frame 4 pass through the coil outlet 3 and are electrically connected to the control circuit.

[0022] The outer diameter of the gland 2 is interference fit with the steel cylinder receiving hole 52, pressing on the end surface of the long magnetic steel cylinder 9 and the short magnetic steel cylinder 11 to fix the two to the bearing seat 5. Of course, the gland 2 can be fixedly connected to the bearing seat 5 by means of threads.

[0023] The magnetic shaft 13, which is matched with the magnetic fluid bearing with self-sensing function in this embodiment, is inserted into the bearing seat 5 from one end of the bearing seat 5, passes through the inner hole of the pressure cover 2, the central aperture of the short magnetic steel cylinder 11, the central aperture of the coil skeleton 4, the central aperture of the long magnetic steel cylinder 9, the axial hole 51 of the bearing seat 5, the spring accommodating hole 53, and finally passes through the bearing seat 5.

[0024] In this embodiment, the magnetic fluid bearing with self-sensing function further includes two springs 12. One spring 12 is sleeved on the magnetic shaft 13 located at the inner hole position of the gland 2, and the other spring 12 is sleeved on the magnetic shaft 13 located at the spring receiving hole 53.

[0025] In this embodiment, two end covers 8 are provided at both ends of the bearing seat 5 . The two end covers 8 are respectively pressed on both sides of the two springs 12 and are fixedly connected to the bearing seat 5 by bolts 7 .

[0026] In this embodiment, an O-ring seal 1 and a mechanical seal 14 are provided at the connection position between the bearing seat 5 and the end cover 8 .

[0027] The actual application process of magnetic fluid bearings with self-sensing function:

[0028] like Figure 2 As shown, a magnetic shaft 13 passes through a self-sensing magnetic fluid bearing at each end, which is connected to the drive motor via a coupling. A coil 10, wound around a coil bobbin 4, exits at coil outlet 3 at each end and connects to a control circuit. This circuit measures the radial displacement of the shaft during bearing operation and controls the input current, thereby automatically controlling the internal damping and viscosity of the magnetic fluid bearing, achieving vibration reduction and controllable damping.

[0029] The self-sensing magnetic fluid bearing excites the magnetic field through the direct current of the coil, controls the viscosity and damping force of the magnetic fluid through the strength of the magnetic field, and automatically collects the vibration of the bearing rotor and adjusts the current passing through the coil through the PID closed-loop control system to achieve continuous cycle control. Ultimately, the magnetic fluid bearing damping can be continuously controlled under different working conditions to achieve the optimal vibration reduction effect; it has the characteristics of wide application range and strong applicability.

[0030] The embodiments described above are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A magnetic fluid bearing with self-sensing function, characterized by: include: Bearing seat (5), long magnetic steel cylinder (9), coil skeleton (4), coil (10), short magnetic steel cylinder (11), magnetic shaft (13); The center of the bearing seat (5) has an axial hole (51), and one end has a steel cylinder receiving hole (52), and the two are coaxially arranged; the side wall of the bearing seat (5) on one side where the steel cylinder receiving hole (52) is located has a coil outlet (3), and the side wall on the other side has a magnetorheological fluid hole (6); The outer diameter of the long magnetic steel cylinder (9) matches the aperture of the steel cylinder receiving hole (52), and the central aperture of the long magnetic steel cylinder (9) matches the magnetic axis (13); The coil (10) is wound on the coil frame (4); the coil frame (4) wound with the coil (10) is embedded in the long magnetic steel cylinder (9); the central aperture of the coil frame (4) matches the magnetic axis (13); The short magnetic steel cylinder (11) is embedded in the long magnetic steel cylinder (9) and pressed on the coil skeleton (4); the central aperture of the short magnetic steel cylinder (11) matches the magnetic axis (13); Two ends of the coil (10) wound on the coil frame (4) pass through the coil outlet (3) and are electrically connected to a circuit control component; The matching magnetic shaft (13) passes through the central aperture of the short magnetic steel cylinder (11), the central aperture of the coil skeleton (4), the central aperture of the long magnetic steel cylinder (9), and the shaft hole (51) of the bearing seat (5), and is rotatably connected to the bearing seat (5).

2. The magnetic fluid bearing with self-sensing function according to claim 1, characterized in that: in, The other end of the bearing seat (5) is provided with a spring receiving hole (53), and the spring receiving hole (53) is coaxially arranged with the shaft hole (51).

3. The magnetic fluid bearing with self-sensing function according to claim 2, characterized in that: in, The magnetorheological fluid hole (6) is located on the side wall where the spring receiving hole (53) is located; The matching magnetic conductive shaft (13) also passes through the spring receiving hole (53).

4. The magnetic fluid bearing with self-sensing function according to claim 3, characterized in that: It also includes a pressure cover (2); the outer diameter of the pressure cover (2) is interference-fitted with the steel cylinder receiving hole (52), and is pressed on the end surface of one side of the long magnetic steel cylinder (9) and the short magnetic steel cylinder (11), thereby fixing the two to the bearing seat (5); The matching magnetic conductive shaft (13) also passes through the inner hole of the pressure cover (2).

5. The magnetic fluid bearing with self-sensing function according to claim 4, characterized in that: Also includes: two springs (12); One of the springs (12) is sleeved on the magnetic shaft (13) located at the inner hole position of the pressure cover (2); the other spring (12) is sleeved on the magnetic shaft (13) located at the spring receiving hole (53).

6. The magnetic fluid bearing with self-sensing function according to claim 5, characterized in that: in, Two end covers (8) are provided at both ends of the bearing seat (5); the two end covers (8) are respectively pressed on both sides of the two springs (12) and are fixedly connected to the bearing seat (5).

7. The magnetic fluid bearing with self-sensing function according to claim 6, characterized in that: in, An O-ring (1) and a mechanical seal (14) are provided at the position where the bearing seat (5) is connected to the end cover (8).

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