WO2003040569A1

WO2003040569A1 - Fan having a flexible shaft and a magnetic suspending bearing

Info

Publication number: WO2003040569A1
Application number: PCT/CN2001/001535
Authority: WO
Inventors: Dagang Liu
Original assignee: Dagang Liu
Priority date: 2001-11-06
Filing date: 2001-11-06
Publication date: 2003-05-15

Abstract

The present invention refers to a fan, particularly a fan having a flexible shaft and a magnetic suspending bearing, so that mechanical vibration is minimized and lubricating of the bearing is not needed. The fan comprises a casing in witch is installed an impeller. The axle of the impeller supported by a bearing which can radially magnetic suspending the axle. A flexible shaft is connected between the impeller axle and the motor axle.

Description

Magnetic levitation soft shaft fan

Field

The invention relates to an equipment-fan capable of generating pressure and flow of gas, in particular to a magnetic levitation soft-shaft fan capable of eliminating mechanical vibration and bearing without lubrication. Background of the invention

The fan that people usually use is to install the impeller on a rigid shaft. Due to the deviation between the center of mass and the center of rotation during the manufacturing process, when the impeller rotates, the unbalanced inertial centrifugal force will produce large mechanical vibration and noise.

The inventor's previous Chinese patent ZL99206246. 2. "Soft shaft centrifugal fan" discloses a soft shaft centrifugal fan, the impeller of which is connected to the motor through a soft shaft, so that the impeller will take its own center of mass as the center of rotation, and Smooth and high-speed operation, so the impeller does not produce mechanical vibration, nor does it produce mechanical vibration noise. However, in the above Chinese patent, the structure of the supporting impeller is relatively complicated, it is difficult to manufacture and install, the cost is high, and it is not economically beneficial. In particular, the reliability of the lubrication system is reduced. The lubrication system needs to be maintained frequently. A slight negligence will cause the fan shaft. Damage. Summary of invention

The object of the present invention is to provide a magnetically levitated flexible shaft fan, in particular to a magnetically levitated flexible shaft fan that can not only generate pressure and flow of gas, but also eliminate mechanical vibration and reduce noise, and can work reliably for a long time without lubrication. .

The purpose of the present invention is to sell the following: A magnetic levitation soft shaft fan, comprising: a casing with a fan impeller inside, the impeller is fixed on the impeller shaft, the impeller shaft is connected with a motor, and the impeller shaft The bearing is positioned to make the impeller shaft diameter A magnetic shaft 7 positioned in suspension is connected to the impeller shaft and the motor by a coupling flexible shaft capable of transmitting torque.

As described above, a magnetic levitation soft shaft fan, the magnetic bearing includes two inner and outer permanent magnet rings, the inner ring of which is sleeved on the impeller shaft, and the outer ring is fixed on the bearing seat.

As described above, for a magnetic levitation soft shaft fan, the magnetic bearings may be two integral inner and outer permanent magnet ring sleeves, respectively.

The magnetic levitation soft shaft fan described above, wherein the magnetic field of the permanent magnet ring is axial. As described above, for a magnetic levitation soft shaft fan, the two inner and outer permanent magnet ring sleeves of the magnetic bearing can be assembled from multiple permanent magnets, respectively.

The magnetic levitation soft shaft fan described above, the magnetic field of the permanent magnet ring is radial. As described above, for a magnetic levitation soft shaft fan, the outer ring of the magnetic bearing may be a complete sleeve, or a part or parts of a ring sleeve, and are respectively installed on the inner edge of the magnetic bearing.

The magnetically levitated flexible shaft fan described above, the coupling flexible shaft may be a flexible rod. A magnetic levitation flexible shaft fan as described above, the coupling flexible shaft may be a universal joint flexible shaft.

A magnetic levitation flexible shaft fan as described above, the coupling flexible shaft may be a rope-type flexible shaft. .

The magnetic levitation soft shaft fan proposed by the present invention uses a permanent magnet bearing to make the fan impeller be radially suspended and positioned. At the same time, the impeller is connected to the motor output shaft through a soft shaft for axial positioning and torque transmission, so that the impeller shaft is suspended in a fixed position. With its shield center as the center of rotation, it runs smoothly and at high speed. Because of adopting the above scheme, this magnetic levitation soft shaft fan overcomes the defects of the known technology during operation, completely eliminates mechanical vibration and noise, and does not need lubrication, and the fan structure is simplified; because the magnetic bearing never wears, it The reliability and life have been greatly improved. In addition, since the running resistance of the magnetic bearing is Zero. Therefore, the fan of the present invention is also a high-efficiency energy-saving fan; since the foundation is not required when installing the fan, the fan user saves a sum of investment. Drawing tube to explain

FIG. 1 is a schematic structural diagram of a magnetically suspended flexible shaft fan according to the present invention, which shows a cantilevered flexible rod flexible shaft fan supported by a magnetic bearing;

FIG. 2 is another schematic structural diagram of a magnetically levitated flexible shaft fan according to the present invention, which shows a fan with a flexible shaft extending from an air inlet;

FIG. 3 is another schematic structural diagram of a magnetic levitation flexible shaft fan according to the present invention, which shows a double-supported, rope-type flexible shaft fan;

FIG. 4 is another schematic structural diagram of a magnetic suspension flexible shaft fan according to the present invention, which shows a double-supported, universal joint flexible shaft fan;

Fig. 5 is a schematic structural view of a magnetic levitation soft shaft fan according to the present invention as an axial flow fan; Figs. 6A and 6B are schematic structural views of a magnetic bearing inner ring of the magnetic levitation soft shaft fan according to the present invention;

7 is an enlarged schematic view of a partial structure at I in FIG. 3;

8A and 8B are schematic diagrams of the magnetic bearing of the magnetic levitation soft shaft fan according to the present invention as a split structure. Description of the preferred embodiment

As shown in FIG. 1, a magnetic levitation soft shaft fan provided by the present invention includes: a casing 1 with a fan impeller 2 therein, the impeller 2 is fixed on an impeller shaft 9, and the impeller shaft 9 is in phase with a motor 5. The impeller shaft 9 is positioned by a shaft, and the bearing is a magnetic bearing 3 that can radially locate the impeller shaft 9. The impeller shaft 9 and a motor output shaft can be connected with a coupling flexible shaft that can transmit torque. 4. As shown in FIGS. 6A and 8A, the inner ring 10 of the magnetic bearing is assembled by multiple permanent magnets, the magnetic field is radial, and a thin-walled sleeve 6 made of a non-magnetic material such as stainless steel Closely packed and packaged in base case 8. The thin-walled sleeve 6 may be integral or segmented, and it may be axially positioned by a baffle at the entire end of the base sleeve 8 (not shown in the figure :). The outer ring structure of the magnetic bearing 3 can be referred to the corresponding design of the inner ring. It is also composed of several permanent magnet blocks 7 arranged closely in the outer ring sleeve 8. Inside, a non-magnetic positioning device (not shown) can be provided on the surface. ). The outer ring may be a whole outer ring, and the permanent magnet block 7 is arranged in sections thereof, or it may be divided into structures as shown in FIGS. 6B and 8B as described below.

As shown in FIGS. 8A and 8B, the permanent magnet inner ring 10 of the magnetic shaft 7 | c 3 is set on the impeller shaft 9, the outer ring 11 of the magnetic bearing 3 is fixed to the bearing seat, and the outer ring of the magnetic bearing is The example is a split outer ring, which can be easily installed. The lower part is large and has a strong magnetic field, so that it can bear the weight of the impeller so that it is suspended. The upper part and the sides are smaller, and only the impeller is limited. . In use, the base of the outer ring 11 can be adjusted to adjust the position of the impeller 2 relative to the air inlet. The magnetic bearing outer ring on the upper and sides can also be adjusted to make the impeller positioning accurate. And as shown in FIGS. 6B and 8B, the permanent magnet blocks 7 are discontinuously arranged, and there is a gap between each block, and this structure can be easily installed.

In this embodiment, the permanent magnet ring is composed of multiple magnets tightly or spaced apart, and the magnetic coil is radial. Since it is composed of multiple magnets, and the outer ring of the magnetic bearing is composed of several parts, it is easy to manufacture. Save magnetic material, it is suitable for magnetic bearing of large fan.

Compared with the rigid shaft, the above soft shaft only transmits torque and axial positioning to the impeller, and does not position the impeller in the radial direction, allowing the impeller to have a small displacement in the radial direction.

The magnetic levitation soft shaft fan proposed by the present invention uses a permanent magnet bearing to suspend and locate the impeller in the radial direction. At the same time, the impeller is connected to the motor through a soft shaft to perform axial positioning and torque transmission, so that the impeller can be suspended at a fixed position and its own center of mass. For smooth and high-speed rotation center. Because the above scheme is adopted, the magnetic levitation soft shaft fan proposed by the present invention is The mechanical vibration and noise of the known fan are used, and no lubrication is needed, and the fan structure is simplified. Because the magnetic bearing never wears, it greatly improves its reliability and life.

In addition, since the running resistance of the magnetic bearing is almost zero, the magnetically levitated flexible shaft fan proposed by the present invention is also a high-efficiency energy-saving fan, which does not need to lay a foundation during installation, so that the fan user can also save a sum of investment.

Example 2

As shown in Fig. 2, the flexible shaft 4 of the flexible rod extends through the air inlet of the fan, and the bearings and the motor are respectively arranged on both sides of the fan casing 1. A sealing cover can also be provided at the magnetic bearing to prevent the gas from leaking easily and avoid Because of the gas pressure loss, the bearing structure can be the same as that of the first embodiment.

In this embodiment, since the flexible shaft 4 is relatively thin compared to the diameter of the fan, it will not affect the intake air, but the above arrangement reduces the force of the magnetic bearing, which is beneficial to reducing costs.

The remaining advantages are the same as those of Embodiment 1, and are not described herein again.

Example 3

As shown in FIGS. 3 and 7, in this embodiment, the impeller 2 is supported by a double magnetic bearing, and the magnetic bearing 3 ′ is composed of two integral inner and outer permanent magnet rings 12 and 12, which are respectively sleeved and fixed on The magnetic field of the impeller shaft 9 and the bearing seat is axial. The impeller shaft 9 and the motor output shaft are indirectly provided with a nylon coupling flexible shaft 4 capable of transmitting torque.

The magnetic levitation soft shaft fan proposed in this embodiment is a small cross-flow fan, which can be applied to a cross-flow fan in an indoor unit of a split air conditioner. The above-mentioned integrated permanent magnet ring is easy to manufacture and install, and uses a nylon rope shaft as a coupling shaft, thereby reducing manufacturing costs.

Example 4

As shown in FIG. 4, the coupling soft shaft for transmitting torque between the impeller shaft 9 and the motor 5 4 is the universal joint flexible shaft. For the magnetic bearing structure, refer to the structure described in Embodiment 1.

In this embodiment, since the universal joint flexible shaft 4 transmits a larger torque than the flexible shaft in the above embodiment, this structure can be applied to a large-scale fan.

Example 5

As shown in FIG. 5, the magnetic levitation soft shaft fan structure proposed by the present invention can also be applied to axial flow fans. The coupling soft shaft 4 for transmitting torque between the impeller shaft 9 and the motor 5 may be a universal joint, a wire rope or a flexible rod. Flexible shaft.

Its advantages are the same as those described above, and will not be repeated here.

Compared with the rigid shaft, the flexible shaft in the present invention can be a flexible shaft, a flexible shaft, a universal shaft, a flexible shaft or a flexible shaft. Their common feature is that only For the transmission of torque and axial positioning of the impeller, the impeller cannot be positioned radially. The impeller should be allowed to have a small displacement in the radial direction. The rope-type flexible shaft can be a steel wire rope or a rope made of other materials, and the outside of the rope can be covered with a spring or a flexible sheath that can tension it.

Between the fan shaft and the casing, the impeller and the air inlet can be sealed with a magnetic fluid to reduce pressure and flow loss.

Claims

Claim

1. A magnetically levitated flexible shaft fan, comprising: a casing having a fan impeller therein, the impeller is fixed on the impeller shaft, the impeller shaft is connected with a motor, and the impeller shaft is positioned by the shaft, and is characterized by: The bearing is a magnetic bearing capable of radially locating the impeller shaft. A flexible coupling shaft capable of transmitting torque can be connected between the impeller shaft and the motor.

2. A magnetic levitation soft shaft fan according to claim 1, characterized in that: said magnetic bearing comprises two inner and outer permanent magnet rings which are sleeved on each other, wherein the inner ring is sleeved on the impeller shaft and the outer ring It is fixed on the bearing seat.

3. A magnetic levitation soft shaft fan according to claim 1 or 2, characterized in that: the magnetic bearing may be two integral inner and outer permanent magnet ring sleeves, respectively.

4. A magnetic levitation soft shaft fan according to claim 3, wherein the magnetic field of the permanent magnet ring is axial.

5. A magnetic levitation soft shaft fan according to claim 1 or 2, characterized in that: the two inner and outer permanent magnet ring sleeves of the magnetic bearing can be assembled from multiple permanent magnets, respectively.

6. A magnetic levitation soft shaft fan according to claim 5, characterized in that the magnetic field of the permanent magnet ring is radial.

7. A magnetic levitation soft shaft fan according to claim 5, characterized in that: the outer ring of the magnetic shaft may be a complete collar, or a part or parts of a collar, and Installed on the inner edge of the magnetic bearing.

8. The magnetically levitated flexible shaft fan according to claim 1, wherein: the coupling flexible shaft is a flexible rod.

9. A magnetic levitation flexible shaft fan according to claim 1, wherein the coupling flexible shaft is a universal joint flexible shaft.

10. A magnetically levitated flexible shaft fan according to claim 1, wherein the coupling flexible shaft is a rope-type flexible shaft.