CN112196816A

CN112196816A - Brushless direct current outer rotor fan

Info

Publication number: CN112196816A
Application number: CN202011259748.5A
Authority: CN
Inventors: 王苗森; 章泽军; 王亮; 倪炯利
Original assignee: Wolong Electric Group Co Ltd
Current assignee: Wolong Electric Drive Group Co Ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-01-08

Abstract

The invention discloses a brushless direct-current outer rotor fan, belongs to the technical field of fans, and aims to overcome the defect of high noise of the existing outer rotor fan. The fan comprises a rotating part and a fixing part, wherein the rotating part comprises a wind wheel, an outer rotor and a rotating shaft, and the fixing part comprises a volute and an inner stator. The bearing is arranged on the fixing part through the elastic bearing seat, so that resonance between the rotating part and the fixing part can be avoided when the rotating part rotates, the running noise of the fan is reduced, and the service life of the fan is prolonged.

Description

Brushless direct current outer rotor fan

Technical Field

The invention belongs to the technical field of fans, and relates to a brushless direct-current outer rotor fan.

Background

The existing external rotor fan comprises an external rotor, an internal stator and a volute, wherein the external rotor is fixedly connected with a rotating shaft, the rotating shaft is directly and rigidly connected with the internal stator and the volute in a rotating mode through a bearing, the external rotor rotates to drive a wind wheel to rotate, and in the rotating process, the external rotor, the rotating shaft and the wind wheel are formed on a rotating part and form a fixed part with the internal stator and the volute, so that resonance is easy to occur, high noise is generated, and the service life is influenced.

Disclosure of Invention

The invention provides a brushless direct-current outer rotor fan aiming at the problems in the prior art and aims to overcome the defect of high noise of the conventional outer rotor fan.

The invention is realized by the following steps:

a brushless direct current outer rotor fan comprises a rotating part and a fixing part, wherein the rotating part comprises a wind wheel, an outer rotor and a rotating shaft, the fixing part comprises a volute and an inner stator, and the brushless direct current outer rotor fan is characterized in that an elastic bearing seat is fixedly arranged on the fixing part, a bearing is arranged on the elastic bearing seat, and the rotating shaft is rotatably connected to the fixing part through the bearing. The bearing is arranged on the fixing part through the elastic bearing seat, so that resonance between the rotating part and the fixing part can be avoided when the rotating part rotates, the running noise of the fan is reduced, and the service life of the fan is prolonged.

Preferably, the hardness of the elastic bearing seat is 40-70 HA. The hardness of the elastic bearing seat is too large, the vibration reduction effect is poor, the hardness of the elastic bearing is too small, and the fixed part and the rotating part are easy to shake relatively.

Preferably, the bearing includes a ball bearing and an oil bearing, the ball bearing is disposed corresponding to the inner stator, and the outer end of the rotating shaft is connected to the volute through the oil bearing. The ball bearing has high strength and better supporting effect, and can form support for the inner stator, the outer rotor and the wind wheel by being arranged corresponding to the inner stator, so that the service life of the fan is prolonged; the bearing at the outer end part of the rotating shaft does not need strong bearing capacity, and the cost is low due to the adoption of the oil bearing. Therefore, the service life and the manufacturing cost are both considered, and the overall cost performance of the fan is improved.

Preferably, the outer wall of the oil-retaining bearing is spherical. Therefore, the concentricity between the rotating shaft and the oil-containing bearing is convenient to keep, the running vibration of the fan is reduced, and the running noise is reduced.

Preferably, the outer rotor comprises an iron shell and a magnetic ring fastened on the inner wall of the iron shell, a knurl is arranged at one end of the rotating shaft, the rotating shaft is fixedly connected with the iron shell through a rotor plastic package at the knurl, and the wind wheel is integrally formed on the rotor plastic package. The knurl can avoid taking place the circumference between pivot and the rotor plastic envelope and skid.

Preferably, the bottom wall of the iron shell is provided with a limiting hole, and the rotor plastic package partially penetrates through the limiting hole. Therefore, the iron shell can better transmit the torque to the rotor plastic package, and the rotating stability of the wind wheel is improved.

Preferably, a first mounting groove is provided on an outer wall of the scroll casing, and the oil-retaining bearing is mounted in the first mounting groove. This facilitates the maintenance and replacement of the oil retaining bearing.

Preferably, the inner wall of the volute is provided with a mounting column, the inner stator is sleeved on the mounting column, the mounting column is provided with a second mounting groove, and the ball bearing is mounted on the second mounting groove.

Preferably, the inner wall of the volute is provided with a mounting convex ring, and the mounting convex ring is fixedly provided with a control plate. The installation bulge loop can strengthen the local structure of spiral case, and the control panel of being convenient for passes through the fix with screw.

Preferably, the mounting column comprises a bottom column, a middle column and a top column, the outer diameter of the bottom column, the middle column and the top column are sequentially increased, the iron core of the inner stator is sleeved on the top column and is abutted against the end face of the middle column, and the control panel is sleeved on the bottom column. Therefore, the inner stator and the control panel are arranged more hierarchically and are not interfered with each other, and the assembly efficiency is improved.

According to the brushless direct-current outer rotor fan, the bearing is arranged on the fixed part through the elastic bearing seat, so that resonance between the rotating part and the fixed part can be avoided when the rotating part rotates, the running noise of the fan is reduced, and the service life of the fan is prolonged.

Drawings

FIG. 1 is a schematic structural diagram of a fan;

FIG. 2 is a schematic cross-sectional view of a blower;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic view of a rotating part;

FIG. 5 is a cross-sectional view schematically showing a rotating portion;

FIG. 6 is a cross-sectional view schematically showing the fixing portion;

FIG. 7 is a first angular configuration of the base;

FIG. 8 is a second angular configuration of the base;

FIG. 9 is a schematic structural view of an iron shell;

fig. 10 is a schematic structural view of an oil-impregnated bearing.

Reference is made to the accompanying drawings in which: 100. a volute; 110. a base; 111. a first mounting groove; 112. mounting a column; 113. a second mounting groove; 114. installing a convex ring; 115. a bottom pillar; 116. a center pillar; 117. a top pillar; 120. a cover body; 200. an outer rotor; 210. an iron shell; 211. a limiting hole; 220. a magnetic ring; 300. a rotating shaft; 310. a graphite nylon washer; 320. a clamp spring; 400. rotor plastic package; 410. a wind wheel; 510. a ball bearing; 520. an oil-retaining bearing; 530. an elastic bearing seat; 600. a control panel; 700. an inner stator.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment provides a brushless dc external rotor 200 fan, as shown in fig. 1-6, comprising a rotating part and a fixed part, wherein the rotating part comprises a wind wheel 410, an external rotor 200 and a rotating shaft 300, the fixed part comprises a volute 100 and an internal stator 700, an elastic bearing seat 530 is fixedly arranged on the fixed part, a bearing is arranged on the elastic bearing seat 530, and the rotating shaft 300 is rotatably connected to the fixed part through the bearing. Install the bearing on the fixed part through elastic bearing seat 530, can avoid rotating the part when rotating and fixed part resonance takes place like this, reduce fan operating noise, improve fan life. The scroll casing 100 includes a base 110 and a cover 120, wherein a bearing is installed on the base 110, and after the rotating part is assembled on the base 110, the cover 120 is fixed on the base 110 to protect the rotating part.

The elastomeric bearing blocks 530 have a hardness of 40-70HA, such as 50HA, 55HA, 60 HA. The hardness of the elastic bearing seat 530 is too large, the vibration damping effect is poor, the hardness of the elastic bearing is too small, and the fixed part and the rotating part are easy to shake relatively.

As shown in fig. 3, the bearing includes a ball bearing 510 and an oil bearing 520, the ball bearing 510 is disposed corresponding to the inner stator 700, and the outer end of the rotation shaft 300 is connected to the scroll casing 100 through the oil bearing 520. The ball bearing 510 has high strength and better supporting effect, and can support the inner stator 700, the outer rotor 200 and the wind wheel 410 by being arranged corresponding to the inner stator 700, so that the service life of the fan is prolonged; the bearing at the outer end of the rotating shaft 300 does not need strong bearing capacity, and the oil bearing 520 is adopted, so that the cost is low. Therefore, the service life and the manufacturing cost are both considered, and the overall cost performance of the fan is improved. In alternative embodiments, the bearings may all be ball bearings 510 or all be oil bearings 520.

As shown in fig. 10, the outer wall of the oil-impregnated bearing 520 has a spherical shape. Therefore, the direction of the oil bearing 520 on the corresponding elastic bearing seat 530 can be self-adaptively adjusted, the concentricity between the rotating shaft 300 and the oil bearing 520 is conveniently kept, the running vibration of the fan is reduced, and the running noise is reduced.

As shown in fig. 4-5, the outer rotor 200 includes an iron shell 210 and a magnetic ring 220 fastened on an inner wall of the iron shell 210, a knurl is provided at one end of the rotating shaft 300, the rotating shaft 300 is fixedly connected with the iron shell 210 at the knurl by a rotor plastic package 400, and the wind wheel 410 is integrally formed on the rotor plastic package 400. The annular knurl can avoid taking place the circumference between pivot 300 and the rotor plastic envelope 400 and skid, and wind wheel 410 integrated into one piece is on rotor plastic envelope 400, and sound construction, processing is convenient, need not extra wind wheel 410 assembly process.

As shown in fig. 9, the bottom wall of the iron shell 210 is provided with a limiting hole 211, the rotor plastic package 400 partially penetrates through the limiting hole 211, and an injection molding material can penetrate through the limiting hole 211 in the injection molding process, so that the iron shell 210 can better transmit torque to the rotor plastic package 400, and the rotating stability of the wind wheel 410 is improved.

As shown in fig. 6 to 8, a first mounting groove 111 is provided on an outer wall of the scroll casing 100, and an oil bearing 520 is mounted in the first mounting groove 111. This facilitates maintenance and replacement of the oil impregnated bearing 520. After the rotating shaft 300 penetrates out of the oil-retaining bearing 520, the graphite nylon gasket 310 is sleeved in the rotating shaft, and the clamp spring 320 is arranged for limiting.

The inner wall of the base 110 of the scroll casing 100 is provided with a mounting post 112, the inner stator 700 is sleeved on the mounting post 112, the mounting post 112 is provided with a second mounting groove 113, and the ball bearing 510 is mounted on the second mounting groove 113. The inner wall of the volute 100 is provided with a mounting convex ring 114, and the control plate 600 is fixedly arranged on the mounting convex ring 114. The installation of the protruding ring 114 can enhance the partial structure of the scroll casing 100, and facilitate the fixing of the control plate 600 by screws. The mounting post 112 includes a bottom post 115, a middle post 116 and a top post 117 with sequentially increasing outer diameters, the iron core of the inner stator 700 is sleeved on the top post 117 and is abutted against the end surface of the middle post 116, and the control panel 600 is sleeved on the bottom post 115. Therefore, the inner stator 700 and the control panel 600 are arranged more hierarchically and do not interfere with each other, and the assembly efficiency is improved.

Claims

1. A brushless direct current outer rotor fan comprises a rotating part and a fixed part, wherein the rotating part comprises a wind wheel (410), an outer rotor (200) and a rotating shaft (300), the fixed part comprises a volute (100) and an inner stator (700), and the brushless direct current outer rotor fan is characterized in that an elastic bearing seat (530) is fixedly arranged on the fixed part, a bearing is arranged on the elastic bearing seat (530), and the rotating shaft (300) is rotatably connected to the fixed part through the bearing.

2. The brushless DC external rotor fan of claim 1, wherein the hardness of the resilient bearing seat (530) is 40-70 HA.

3. The brushless dc external rotor fan according to claim 1, wherein the bearing comprises a ball bearing (510) and an oil-retaining bearing (520), the ball bearing (510) is disposed corresponding to the internal stator (700), and the outer end of the rotating shaft (300) is connected to the volute (100) through the oil-retaining bearing (520).

4. The brushless DC external rotor fan of claim 3, wherein the outer wall of the oil-containing bearing (520) is spherical.

5. The brushless direct-current outer rotor fan according to claim 1, wherein the outer rotor (200) comprises an iron shell (210) and a magnetic ring (220) fastened on an inner wall of the iron shell (210), a knurling is arranged at one end of the rotating shaft (300), the rotating shaft (300) is fixedly connected with the iron shell (210) at the knurling through a rotor plastic package (400), and the wind wheel (410) is integrally formed on the rotor plastic package (400).

6. The brushless direct-current outer rotor fan according to claim 5, wherein a limiting hole (211) is formed in a bottom wall of the iron shell (210), and the rotor plastic package (400) partially penetrates through the limiting hole (211).

7. A brushless dc external rotor fan according to claim 3, wherein a first mounting groove (111) is provided on an outer wall of the scroll casing (100), and the oil-impregnated bearing (520) is mounted in the first mounting groove (111).

8. The brushless direct-current external rotor fan according to claim 3, wherein the inner wall of the volute (100) is provided with a mounting post (112), the inner stator (700) is sleeved on the mounting post (112), the mounting post (112) is provided with a second mounting groove (113), and the ball bearing (510) is mounted on the second mounting groove (113).

9. The brushless direct-current external rotor fan according to claim 8, wherein the inner wall of the volute (100) is provided with a mounting convex ring (114), and the mounting convex ring (114) is fixedly provided with the control plate (600).

10. The brushless direct-current external rotor fan according to claim 9, wherein the mounting column (112) comprises a bottom column (115), a middle column (116) and a top column (117) with sequentially increasing outer diameters, the iron core of the internal stator (700) is sleeved on the top column (117) and abuts against the end face of the middle column (116), and the control board (600) is sleeved on the bottom column (115).