Axial flow fan of hybrid bearing

Abstract

The utility model discloses an axial flow fan of hybrid bearing, including fan casing, set up in the fan casing, the impeller that is driven by the motor, said motor includes motor casing, set up in the stator and rotor of motor casing, and be used for supporting the bearing of rotor, said bearing includes radial bearing and axial bearing, the radial bearing is a foil type dynamic pressure bearing, an O-shaped ring groove is formed in the outer side wall of the foil type dynamic pressure bearing, and an O-shaped ring is arranged in the O-shaped ring groove in a matched mode. According to the design, the O-shaped ring is used for limiting the gas dynamic pressure bearing, so that the mounting precision of the bearing is ensured. The combined application of the foil type dynamic pressure bearing and the concentrically arranged magnetic levitation thrust bearing has the advantages of no friction, long service life and the like, so that the rotating speed of the bearing fan can be greatly improved, and the purposes of improving the air volume and the air pressure are achieved.

Description

Technical Field

[0001] This utility model relates to heat dissipation equipment, specifically to axial flow fans. Background Technology

[0002] Most existing axial fans use ball bearings, which generate significant heat and have a limited lifespan at high speeds, resulting in a short overall lifespan for the axial fan. Using gas bearings can effectively solve the technical problems of excessive heat and limited lifespan associated with ball bearings at high speeds. However, gas bearings require a high degree of precision in their fit with the rotor, especially in terms of coaxiality. Utility Model Content

[0003] The technical problem solved by this utility model is: how to meet the fitting accuracy required for axial flow fans that use gas bearings.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an axial flow fan with a hybrid bearing, comprising a fan housing, a motor disposed in the fan housing, and an impeller driven by the motor. The motor includes a motor housing, a stator and a rotor disposed in the motor housing, and a bearing for supporting the rotor. The bearing includes a radial bearing and an axial bearing. The radial bearing is a foil-type hydrodynamic bearing. An O-ring groove is formed on the outer wall of the foil-type hydrodynamic bearing, and an O-ring is fitted in the O-ring groove.

[0005] As the rotor accelerates its rotation, an air film forms between the rotor and the foil-type hydrodynamic bearing, causing the rotor to float. In this air-floating state, the rotor rotates without friction with the foil-type hydrodynamic bearing, which not only extends the service life of the axial fan but also provides the conditions for increasing the fan's speed.

[0006] The elastic deformation of the O-ring can absorb the fit error between the foil-type hydrodynamic bearing and the motor housing, allowing the foil-type hydrodynamic bearing to be naturally aligned, thereby keeping the rotation center line of the foil-type hydrodynamic bearing coincide with the rotation center line of the rotor.

[0007] The foil-type hydrodynamic bearing includes a first foil-type hydrodynamic bearing and a second foil-type hydrodynamic bearing. The first foil-type hydrodynamic bearing is located at the front of the motor, and the second foil-type hydrodynamic bearing is located at the rear of the motor. The stator and magnet are located between the first foil-type hydrodynamic bearing and the second foil-type hydrodynamic bearing. The stator is fixedly connected to the motor housing, and the magnet is fixedly mounted on the rotor shaft.

[0008] The axial bearing includes an outer magnetic ring that fits tightly with the second foil-type hydrodynamic bearing and an inner magnetic ring that fits tightly with the rotor shaft, with the outer magnetic ring located around the inner magnetic ring.

[0009] The tail part of the motor is provided with a rear end cover connected with the motor shell, and the rear end cover and the inner magnetic ring have an axial gap.

[0010] The front end face of the first foil type dynamic pressure bearing and the motor shell, the rear end face of the first foil type dynamic pressure bearing and the stator, and the front end face of the second foil type dynamic pressure bearing and the stator all have axial gaps; a first airflow channel is formed in the motor shell, and the first airflow channel communicates the axial gap between the front end face of the first foil type dynamic pressure bearing and the motor shell; a displacement structure is formed in the rotor shaft, and the radial gap between the second foil type dynamic pressure bearing and the rotor shaft and the radial gap between the outer magnetic ring and the inner magnetic ring are communicated by the displacement structure; a second airflow channel is formed in the rear end cover, and the radial gap between the outer magnetic ring and the inner magnetic ring and the external space of the motor are communicated by the second airflow channel.

[0011] The O-shaped ring is used for limiting the gas dynamic pressure bearing, and the installation precision of the bearing is ensured.

[0012] The foil type dynamic pressure bearing and the concentric magnetic floating thrust bearing are combined, and the combination has the advantages of no friction and long service life, so that the bearing fan can greatly improve the rotating speed, and the air volume and air pressure are improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model will be further explained in connection with the drawings:

[0014] Figure 1 It is the schematic view of axial flow fan.

[0015] Explanation of symbols in the drawing:

[0016] 10, motor shell; 11, first airflow channel;

[0017] 20, stator;

[0018] 30, rotor; 31, rotor shaft; 32, magnetic steel; 33, displacement structure;

[0019] 41, first foil type dynamic pressure bearing; 42, second foil type dynamic pressure bearing; 43, O-shaped ring groove;

[0020] 51, outer magnetic ring; 52, inner magnetic ring;

[0021] 60, rear end cover; 61, second airflow channel. DETAILED DESCRIPTION

[0022] As Figure 1An axial flow fan with a hybrid bearing includes a fan housing, a motor disposed in the fan housing, and an impeller driven by the motor. The motor includes a motor housing 10, a stator 20 and a rotor 30 disposed in the motor housing, and a bearing for supporting the rotor. The bearing includes a radial bearing and an axial bearing. The radial bearing is a foil-type hydrodynamic bearing. An O-ring groove 43 is formed on the outer side wall of the foil-type hydrodynamic bearing, and an O-ring is fitted in the O-ring groove.

[0023] The foil-type hydrodynamic bearing includes a first foil-type hydrodynamic bearing 41 and a second foil-type hydrodynamic bearing 42. The first foil-type hydrodynamic bearing is located at the front of the motor, and the second foil-type hydrodynamic bearing is located at the rear of the motor. The stator 20 and the magnet 32 ​​are located between the first foil-type hydrodynamic bearing and the second foil-type hydrodynamic bearing. The stator is fixedly connected to the motor housing 10, and the magnet is fixedly mounted on the rotor shaft 31.

[0024] The axial bearing includes an outer magnetic ring 51 that is tightly fitted with the second foil-type hydrodynamic bearing 42 and an inner magnetic ring 52 that is tightly fitted with the rotor shaft. The outer magnetic ring is located around the inner magnetic ring.

[0025] The motor has a rear end cover 60 at the tail end that is connected to the motor housing 10. There is an axial gap between the rear end cover and the inner magnetic ring 52. The rear end cover is connected to the fan housing.

[0026] The front end face of the first foil-type hydrodynamic bearing 41 and the motor housing 10, the rear end face of the first foil-type hydrodynamic bearing and the stator 20, and the front end face of the second foil-type hydrodynamic bearing 42 and the stator all have axial clearances. A first airflow channel 11 is provided on the motor housing 10, which connects the axial clearance between the front end face of the first foil-type hydrodynamic bearing and the motor housing. A clearance structure 33 is provided on the rotor shaft 31, which connects the radial clearance between the second foil-type hydrodynamic bearing and the rotor shaft with the radial clearance between the outer magnetic ring 51 and the inner magnetic ring 52. A second airflow channel 61 is provided on the rear end cover 60, which connects the radial clearance between the outer magnetic ring and the inner magnetic ring with the external space of the motor.

[0027] Rotor 30 accelerates its rotation, creating an air film between rotor 30 and the foil-type hydrodynamic bearing, causing the rotor to float. In this air-floated state, the rotor rotates without friction with the foil-type hydrodynamic bearing, which not only extends the service life of the axial fan but also provides conditions for increasing the fan's speed.

[0028] The elastic deformation of the O-ring can absorb the fit error between the foil-type hydrodynamic bearing and the motor housing 10, allowing the foil-type hydrodynamic bearing to be naturally aligned, thereby ensuring that the rotation center line of the foil-type hydrodynamic bearing coincides with the rotation center line of the rotor 30, thus guaranteeing the installation accuracy of the bearing.

[0029] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hybrid bearing axial flow fan comprising a fan housing, a motor disposed in the fan housing, an impeller driven by the motor, the motor comprising a motor housing (10), a stator (20) and a rotor (30) disposed in the motor housing, and a bearing for supporting the rotor, the bearing comprising a radial bearing and an axial bearing, the radial bearing being a foil dynamic pressure bearing, characterised in that: An O-ring groove (43) is formed on the outer side wall of the foil dynamic pressure bearing, and an O-ring is fitted in the O-ring groove.

2. The hybrid bearing axial fan of claim 1, wherein: The foil dynamic pressure bearing comprises a first foil dynamic pressure bearing (41) and a second foil dynamic pressure bearing (42). The first foil dynamic pressure bearing is arranged at the front of the motor, and the second foil dynamic pressure bearing is arranged at the tail of the motor. The stator (20) and the magnetic steel (32) are located between the first foil dynamic pressure bearing and the second foil dynamic pressure bearing. The stator is fixedly connected with the motor shell (10), and the magnetic steel is fixedly arranged on the rotor shaft (31).

3. The hybrid bearing shaft flow fan of claim 2, wherein: The axial bearing comprises an outer magnetic ring (51) tightly fitted with the second foil dynamic pressure bearing (42) and an inner magnetic ring (52) tightly fitted with the rotor shaft. The outer magnetic ring is located at the periphery of the inner magnetic ring.

4. The hybrid bearing axial fan of claim 3, wherein: The tail of the motor is provided with a rear end cover (60) connected with the motor shell (10). An axial gap is formed between the rear end cover and the inner magnetic ring (52). The rear end cover is connected with the fan shell.

5. The hybrid bearing shaft flow fan of claim 4 wherein: An axial gap is formed between the front end surface of the first foil dynamic pressure bearing (41) and the motor shell (10), between the rear end surface of the first foil dynamic pressure bearing and the stator (20), between the front end surface of the second foil dynamic pressure bearing (42) and the stator. A first airflow channel (11) is formed on the motor shell (10). The first airflow channel communicates the axial gap between the front end surface of the first foil dynamic pressure bearing and the motor shell. A relief structure (33) is formed on the rotor shaft (31). The radial gap between the second foil dynamic pressure bearing and the rotor shaft, and the radial gap between the outer magnetic ring (51) and the inner magnetic ring (52) are communicated by the relief structure. A second airflow channel (61) is formed on the rear end cover (60). The radial gap between the outer magnetic ring and the inner magnetic ring is communicated with the external space of the motor through the second airflow channel.

Images