Magnetic fluid bearing vibration reduction fan

Abstract

The utility model relates to a magnetofluid bearing damping fan, which comprises a rotor and fan blades, the rotor comprises a hub and a magnetic conductive shaft, the fan blades are circumferentially and uniformly arranged on the periphery of the hub, and a sleeve, a coil, a coil cylinder barrel and a short magnetic conductive sleeve are sequentially arranged in the hub from outside to inside. An annular sealed space is formed between the inner ring face of the short magnetic conductive sleeve and the outer ring face of the magnetic conductive shaft and filled with magnetic fluid, the coil cylinder barrel and the magnetic conductive shaft are coaxially arranged, a groove is formed in the periphery of the coil cylinder barrel, and the coil is wound in the groove of the coil cylinder barrel. According to the magnetic fluid bearing vibration reduction fan, the problem that the service life of the whole fan is shortened due to the fact that the bearing part of the fan is damaged due to long-term overload bearing and vibration is solved, and meanwhile the technical problem of dry friction of a small fan bearing is solved.

Description

Technical Field

[0001] The utility model relates to the field of fans, in particular to a magnetic fluid bearing vibration reduction fan. Background Art

[0002] Small brushless DC fans are widely used in computers, instruments and other occasions as heat dissipation devices due to their simple structure, small size and safe use. At present, the axis of the rotor of this type of small heat dissipation fan is supported on rolling bearings or oil-containing bearings. Although rolling bearings can be filled with grease and the micropores of oil-containing bearings can be filled with lubricating oil, the rotational friction generated by the two is still dry friction and has a certain friction resistance. Especially when working with oily bearings, its friction resistance is large, it is easy to wear and has a short life. In addition, during the operation process, due to dry grinding, it will cause noise, affecting the normal operation of computers and instruments.

[0003] Magnetic fluid bearings are sliding bearings that use a carrier fluid (i.e., magnetic fluid) with magnetic solid particles added to it to replace traditional lubricating oil for lubrication. When the carrier fluid achieves the same lubricating effect as conventional lubricating oil, the viscosity of the magnetorheological fluid will increase in the presence of an external magnetic field, and the corresponding radial damping force of the bearing will also increase. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, the utility model provides a magnetic fluid bearing vibration reduction fan to solve the problem that the bearing part of the fan is damaged due to long-term overload and vibration, thereby shortening the life of the entire fan and the technical problem of dry friction of small fan bearings.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A magnetic fluid bearing vibration reduction fan comprises a rotor and fan blades. The rotor comprises a hub and a magnetic conductive shaft. The fan blades are evenly arranged on the outer circumference of the hub. A sleeve, a coil, a coil cylinder and a short magnetic conductive sleeve are arranged in sequence from the outside to the inside of the hub. An annular sealed space is formed between the inner ring surface of the short magnetic conductive sleeve and the outer ring surface of the magnetic conductive shaft. The sealed space is filled with magnetic fluid. The coil cylinder is coaxially arranged with the magnetic conductive shaft. A groove is arranged on the outer circumference of the coil cylinder. The coil is surrounded in the groove of the coil cylinder.

[0007] As a preferred technical solution, two upper and lower lip-shaped sealing rings are provided between the magnetic conductive shaft and the coil cylinder, and the inner and outer sides of the lip-shaped sealing rings are respectively in contact with the magnetic conductive shaft and the coil cylinder.

[0008] As a preferred technical solution, the lip seal ring is made of one of polytetrafluoroethylene, rubber or leather, preferably polytetrafluoroethylene.

[0009] As a preferred technical solution, two lip-shaped sealing rings are respectively located at the upper and lower ends of the short magnetic conductive sleeve, and the lip-shaped sealing rings are fitted to the short magnetic conductive sleeve through a sealing gasket.

[0010] As a preferred technical solution, when the coil is energized, a magnetic field is generated, the magnetic fluid is magnetized to form a magnetic circuit, and the rotor rotates. When the fan reaches the rated speed, the magnetic shaft is in a suspended state.

[0011] As a preferred technical solution, the magnetic circuit is an internal magnetic circuit.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) The magnetic fluid bearing vibration reduction fan of the utility model has a shaft supported on magnetic fluid, so the friction when the shaft rotates is fluid friction, and its resistance is much smaller than dry friction, and no abnormal noise is generated during operation. The liquid bearing is resistant to vibration, and the magnetic fluid has the effects of vibration reduction, lubrication and heat dissipation on the magnetic shaft.

[0014] (2) The magnetic fluid bearing vibration reduction fan of the utility model adopts magnetorheological fluid to replace the traditional lubricating oil, and effectively and actively controls its lubricating film by applying an external magnetic field, and adjusts the damping size by changing the size of the external magnetic field. When the bearing load changes greatly, the size of the current is adjusted to change the size of the magnetic field generated by the coil, thereby changing the viscosity of the magnetorheological fluid. The increased viscosity offsets the impact caused by the load, thereby realizing the development of a damping controllable sliding bearing.

[0015] (3) The magnetic fluid bearing vibration reduction fan of the utility model proposes a new internal magnetic circuit for magnetic fluid sliding bearings. The direction of the magnetic circuit is easy to be guided, thereby fully exerting the performance of the magnetic circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the magnetic fluid bearing vibration reduction fan of the utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of part A.

[0018] In the figure: 1. rotor; 2. wheel hub; 3. lip seal ring; 4. magnetic shaft; 5. coil cylinder; 6. coil; 7. sleeve; 8. fan blade; 9. short magnetic sleeve; 10. bearing end cover; 11. magnetic fluid; 12. sealing gasket. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further described below in conjunction with specific implementation methods:

[0020] like Figure 1As shown, a magnetic fluid 11 bearing vibration reduction fan includes a rotor 1 and fan blades 8. The rotor 1 includes a hub 2 and a magnetic shaft 4. The fan blades 8 are evenly arranged on the outer periphery of the hub 2. The bottom of the hub 2 is a bearing end cover 10, and the magnetic shaft 4 is fixed in the center of the bearing end cover 10. The hub 2 is provided with a sleeve 7, a coil 6, a coil cylinder 5 and a short magnetic sleeve 9 from the outside to the inside. The inner ring surface of the short magnetic sleeve 9 and the outer ring surface of the magnetic shaft 4 form an annular sealed space. The sealed space is filled with magnetic fluid 11. The magnetic fluid 11 has vibration reduction, lubrication and heat dissipation effects on the magnetic shaft 4. The coil cylinder 5 is coaxially arranged with the magnetic shaft 4. A groove is provided on the outer periphery of the coil cylinder 5, and the coil 6 surrounds the groove of the coil cylinder 5.

[0021] An upper and lower lip-shaped sealing ring 3 are provided between the magnetic conductive shaft 4 and the coil cylinder 5 , and the inner and outer sides of the lip-shaped sealing ring 3 are respectively in contact with the magnetic conductive shaft 4 and the coil cylinder 5 .

[0022] The lip seal ring 3 is made of one of polytetrafluoroethylene, rubber or leather, preferably polytetrafluoroethylene.

[0023] like Figure 2 As shown, two lip-shaped sealing rings 3 are respectively located at the upper and lower ends of the short magnetic conductive sleeve 9, and the lip-shaped sealing rings 3 are attached to the short magnetic conductive sleeve 9 through the sealing gasket 12. The lip-shaped sealing rings 3 and the sealing gasket 12 can effectively prevent the magnetic fluid 11 from leaking.

[0024] This embodiment is only a further explanation of the present invention, not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

Claims

1. A magnetic fluid bearing vibration reduction fan, comprising a rotor and fan blades, characterized in that: The rotor includes a hub and a magnetic shaft, and the fan blades are evenly arranged on the outer circumference of the hub. The hub is provided with a sleeve, a coil, a coil cylinder and a short magnetic sleeve in sequence from the outside to the inside. An annular sealed space is formed between the inner ring surface of the short magnetic sleeve and the outer ring surface of the magnetic shaft. The sealed space is filled with magnetic fluid. The coil cylinder is coaxially arranged with the magnetic shaft, and a groove is provided on the outer circumference of the coil cylinder. The coil is surrounded by the groove of the coil cylinder.

2. A magnetic fluid bearing vibration reduction fan according to claim 1, characterized in that: An upper and lower lip-shaped sealing ring is arranged between the magnetic conductive shaft and the coil cylinder, and the inner and outer sides of the lip-shaped sealing ring are respectively fitted with the magnetic conductive shaft and the coil cylinder.

3. A magnetic fluid bearing vibration reduction fan according to claim 2, characterized in that: The lip seal ring is made of one of polytetrafluoroethylene, rubber or leather.

4. A magnetic fluid bearing vibration reduction fan according to claim 3, characterized in that: The lip seal ring is made of polytetrafluoroethylene.

5. The magnetic fluid bearing vibration reduction fan according to claim 2, characterized in that: Two lip-shaped sealing rings are respectively located at the upper and lower ends of the short magnetic conductive sleeve, and the lip-shaped sealing rings are fitted with the short magnetic conductive sleeve through a sealing gasket.

6. The magnetic fluid bearing vibration reduction fan according to claim 1, characterized in that: When the coil is energized, a magnetic field is generated, the magnetic fluid is magnetized to form a magnetic circuit, and the rotor rotates. When the fan reaches a rated speed, the magnetic shaft is in a suspended state.

7. The magnetic fluid bearing vibration reduction fan according to claim 6, characterized in that: The magnetic circuit is an internal magnetic circuit.

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