CN218771547U

CN218771547U - Bearing structure of high-speed motor and high-speed centrifugal fan

Info

Publication number: CN218771547U
Application number: CN202223135443.0U
Authority: CN
Inventors: 邓程亮; 王阳; 陆细彪; 陈晶晶; 张福军; 狄勋
Original assignee: Mc Motor Technology (shenzhen) Co ltd
Current assignee: Mc Motor Technology (shenzhen) Co ltd
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2023-03-28
Anticipated expiration: 2032-11-24

Abstract

The utility model relates to a high-speed motor's bearing structure and high-speed centrifugal fan, its high-speed motor's bearing structure's technical scheme main points are, include: the motor comprises a motor rotating shaft, a front bearing group and a rear bearing group, wherein the front bearing group is positioned in a front end cover, the rear bearing group is positioned in a rear end cover, the motor rotating shaft comprises an extension end, one end of the extension end extends out of a motor shell, the other end of the extension end is positioned at a connecting end of the motor shell, the front bearing is installed on the extension end of the motor rotating shaft, and the rear bearing is installed on the connecting end of the motor rotating shaft; the front end cover is provided with a front bearing gland and a front shaft sealing sheet; the outer ring of the front bearing group is clamped at least through a front bearing gland, the inner ring of the front bearing group is tightly matched with the motor rotating shaft, and the front bearing group comprises two back-to-back rolling bearings. The aims of improving the deformation resistance and the bearing burnout condition are fulfilled.

Description

Bearing structure of high-speed motor and high-speed centrifugal fan

Technical Field

The utility model relates to the technical field of electric machines, in particular to high-speed motor's bearing structure and high-speed centrifugal fan.

Background

Most of high-speed motors adopted by high-speed centrifugal fans in the prior art are provided with a front end bearing on a front end cover and a rear end bearing on a rear end cover. Due to the characteristics of the high-speed centrifugal fan, when the turbine rotates at a high speed in the volute, pressure difference can be generated, a pulling force towards one side of the front end cover can be formed, the pulling force needs two bearings inside the motor to bear, and the current industry basically adopts angular contact ball bearings because the angular contact ball bearings can bear axial force in a single direction. However, the fan has many special abnormal conditions during the operation process, which can bring reverse impact to the turbine (opposite to the pulling force direction of the turbine in normal operation). The single angular contact ball has a fatal weakness that one direction can bear a large force, and the other direction can only bear a small force, so that a product provided with only one front end bearing and one rear end bearing is easy to burn out the bearings.

In order to improve the bearing burnout condition, in the other part of the high-speed motor, the bearing capacity is increased by arranging a structure of two front end bearings and one rear end bearing or a structure of two front end bearings and two rear end bearings. However, the two angular contact ball bearings are connected in series, so that the bearing can only bear axial force in one direction. The abnormal working condition of the fan operation process is not enough resisted, so that improvement on the abnormal working condition is needed.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model discloses a first purpose provides a high-speed motor's bearing arrangement, realizes increasing radial and axial supporting angle rigidity, improves anti deformability, improves the bearing condition of burning out.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a bearing structure of a high-speed motor, comprising: the motor comprises a motor rotating shaft, a front bearing group and a rear bearing group, wherein the front bearing group is positioned in a front end cover, the rear bearing group is positioned in a rear end cover, the motor rotating shaft comprises an extension end, one end of the extension end extends out of a motor shell, the other end of the extension end is positioned at a connecting end of the motor shell, the front bearing is installed on the extension end of the motor rotating shaft, and the rear bearing is installed on the connecting end of the motor rotating shaft; the front end cover is provided with a front bearing gland and a front shaft sealing sheet; the outer ring of the front bearing group is clamped at least through a front bearing gland, the inner ring of the front bearing group is tightly matched with the motor rotating shaft, and the front bearing group comprises two back-to-back rolling bearings.

In a further arrangement of the present invention, the front bearing cover comprises a first cover and a second cover which are matched with each other; one side of the first gland, which is close to the extending end, extends to form a first pressing ring which is abutted to the outer ring of the front bearing group, one end of the second gland is sleeved on the first pressing ring, and the other end of the second gland is provided with a second pressing ring which extends along the radial direction and is abutted to the outer ring of the front bearing group; and the first gland is provided with a mounting hole used for being locked with the front end cover.

The utility model discloses a further setting, the front axle mounting with motor shaft screw assembly, and compress tightly in front bearing group inner circle.

The utility model discloses a further setting, the rear bearing group includes two antifriction bearing back to back.

The utility model discloses a further setting, back bearing group includes a antifriction bearing.

The utility model discloses a further setting, antifriction bearing is angular contact ball bearing.

The second purpose of the utility model is to provide a high-speed centrifugal fan, effectively resist the fan operation in-process and meet the reverse impact that unusual operating mode caused, improve high-speed centrifugal fan's life.

A high-speed centrifugal fan comprises a high-speed motor, a turbine and a volute, wherein the high-speed motor is provided with the bearing structure of the high-speed motor.

To sum up, the utility model discloses following beneficial effect has:

1. the utility model provides a high-speed motor's bearing arrangement replaces current single bearing or two current series bearings as preceding bearing group through setting up two antifriction bearing back to back, can bear the axial force of two directions and improve bearing of single direction of axial, through two antifriction bearing back to back installations, and the contact angle line of bearing is along the diffusion of axis of revolution direction, and multiplicable its radial and axial supporting angle rigidity, resistance to deformation ability is the biggest.

2. The utility model provides a high-speed centrifugal fan, two antifriction bearing that adopt above back to back can effectively increase the axial force of two directions as the front bearing group to effectively resist the fan operation in-process and meet the reverse impact that abnormal operating mode caused, improve high-speed centrifugal fan's life.

Drawings

Fig. 1 is a schematic structural diagram of a high-speed fan in an embodiment of the present invention;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

fig. 3 is an exploded view of the high-speed fan according to the embodiment of the present invention.

Description of the reference numerals: 01. a motor housing; 1. a motor shaft; 2. a front end cover; 3. a front bearing set; 4. a rear end cap; 5. a rear bearing set; 6. an extension end; 7. a connecting end; 21. a front bearing gland; 22. a front shaft seal piece; 41. a rear shaft seal plate; 211. a first gland; 212. a second gland; 23. a first pressure ring; 24. a second pressure ring; 213. and (7) installing holes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Example (b): the present embodiment relates to a bearing structure of a high-speed motor, as shown in fig. 1, including: the motor comprises a motor rotating shaft 1, a front bearing group 3 and a rear bearing group 5, wherein the front bearing group 3 is positioned in a front end cover 2, the rear bearing group 5 is positioned in a rear end cover 4, the motor rotating shaft 1 comprises an extension end 6, one end of the extension end extends out of a motor shell 01, the other end of the extension end is positioned at a connecting end 7 of the motor shell 01, the front bearing group 3 is installed on the extension end 6 of the motor rotating shaft 1, and the rear bearing group 5 is installed on the connecting end 7 of the motor rotating shaft 1; the front end cover 2 is provided with a front bearing gland 21 and a front shaft sealing sheet 22, the outer ring of the front bearing group 3 is clamped at least by the front bearing gland 21, the inner ring of the front bearing group 3 is arranged in tight fit with the motor rotating shaft 1, and the front bearing group 3 comprises two back-to-back rolling bearings. Compared with the prior art, the two back-to-back rolling bearings are arranged to replace the existing single bearing or the existing two series bearings to serve as the front bearing set 3, so that the axial force in two directions can be borne, the bearing in the axial single direction can be improved, the radial and axial bearing angle rigidity is increased, and the deformation resistance is maximized.

As shown in fig. 1-3, the front bearing cover 21 includes a first cover 211 and a second cover 212 that cooperate; a first press ring 23 abutting against the outer ring of the front bearing group 3 is extended from one side of the first press cover 211 close to the extension end 6, one end of the second press cover 212 is sleeved outside the first press ring 23 of the first press cover 211, and the other end of the second press cover 212 is provided with a second press ring 24 which extends along the radial direction and abuts against the outer ring of the front bearing group 3; so that the outer ring of the front bearing set 3 is pressed between the first pressing ring 23 and the second pressing ring 24.

In this embodiment, the front shaft sealing plate 22 is assembled with the motor shaft 1 by a screw thread and is pressed against the inner ring of the front bearing set 3. It should be noted that the outer diameter of the front shaft sealing plate 22 is smaller than the inner diameter of the second pressing ring 24, so that the inner ring of the front bearing set 3 is pressed by the front shaft sealing plate 22. Furthermore, the first gland 211 is provided with a mounting hole 213 for locking with the front end cover 2, so that the whole front bearing gland 21 is stably mounted on the front end cover 2 through a locking bolt.

As shown in fig. 1, a rear shaft sealing sheet 41 is disposed on the rear end cover 4, an outer ring of the rear bearing set 5 is clamped by the rear shaft sealing sheet 41, and the rear bearing set 5 in this embodiment includes a rolling bearing. In other embodiments, the rear bearing set 5 may be provided as two back-to-back rolling bearings according to the use requirement, so as to increase the axial force of the connection end 7 of the motor rotation shaft 1. Wherein, the rear end cover 4 is provided with a mounting groove for accommodating the rear bearing group 5 and the rear shaft seal sheet 41, the rear shaft seal sheet 41 and the mounting groove do not move relatively, the outer ring of the rear bearing group 5 is tightly matched with the rear shaft seal sheet 41, and the inner ring of the rear bearing group 5 is tightly matched with the motor rotating shaft 1.

In the above bearing structure of the high-speed motor, the rolling bearing is an angular contact ball bearing. The angular contact ball bearings comprise a narrow inner ring and a wide inner ring, the wide inner ring between the two angular contact ball bearings faces the wide inner ring, the narrow inner ring faces outwards, and the narrow inner ring of the two angular contact ball bearing combinations abuts against the bottom of the motor rotating shaft 1.

This high speed motor's bearing structure replaces current single bearing or two current series bearings as front bearing group 3 through setting up two antifriction bearing back to back, can bear the axial force of two directions and improve the bearing of the single direction of axial, through two antifriction bearing back to back installations, the contact angle line of bearing spreads along the axis of revolution direction, multiplicable radial and axial supporting angle rigidity thereof, and the resistance to deformation ability is the biggest, and then improves the bearing condition of burning out.

The embodiment also relates to a high-speed centrifugal fan which comprises a high-speed motor, a turbine and a volute, wherein the high-speed motor is provided with the bearing structure of the high-speed motor.

Two antifriction bearing back-to-back above adopting are as front bearing group 3, can effectively increase the axial force of two directions to effectively resist the fan operation in-process and meet the reverse impact that abnormal operating mode caused, improve high-speed centrifugal fan's life.

The above description is only for the purpose of illustration and not limitation, and other modifications or equivalent replacements made by those skilled in the art to the technical solution of the present invention should be covered by the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A bearing structure of a high-speed motor, comprising: the motor comprises a motor rotating shaft (1), a front bearing group (3) positioned in a front end cover (2) and a rear bearing group (5) positioned in a rear end cover (4), wherein the motor rotating shaft (1) comprises an extending end (6) with one end extending out of a motor shell (01), the other end of the extending end is positioned at a connecting end (7) of the motor shell (01), the front bearing group (3) is installed on the extending end (6) of the motor rotating shaft (1), and the rear bearing group (5) is installed on the connecting end (7) of the motor rotating shaft (1);

the front end cover is characterized in that a front bearing gland (21) and a front shaft sealing piece (22) are arranged on the front end cover (2); the outer ring of the front bearing group (3) is clamped at least through a front bearing gland (21), the inner ring of the front bearing group (3) is tightly matched with the motor rotating shaft (1), and the front bearing group (3) comprises two back-to-back rolling bearings.

2. A bearing structure of a high-speed electric motor according to claim 1, wherein said front bearing cover (21) comprises a first cover (211) and a second cover (212) which are fitted;

one side of the first gland (211), which is close to the extension end (6), extends to form a first press ring (23) which is abutted to the outer ring of the front bearing set (3), one end of the second gland (212) is sleeved on the first gland (211), and the other end of the second gland is provided with a second press ring (24) which extends along the radial direction and is abutted to the outer ring of the front bearing set (3);

and the first gland (211) is provided with a mounting hole (213) used for being locked with the front end cover (2).

3. The bearing structure of a high-speed motor according to claim 1, wherein the front shaft sealing piece (22) is in threaded fit with the motor rotating shaft (1) and is pressed on the inner ring of the front bearing set (3).

4. A bearing construction for a high-speed electric machine according to claim 1, characterised in that the rear bearing set (5) comprises two back-to-back rolling bearings.

5. A bearing construction for a high-speed electric machine according to claim 1, characterized in that the rear bearing set (5) comprises a rolling bearing.

6. The bearing structure of a high-speed motor according to claim 1, wherein the rolling bearing is an angular contact ball bearing.

7. A high-speed centrifugal fan comprises a high-speed motor, a turbine and a volute, and is characterized in that the high-speed motor is provided with a bearing structure of the high-speed motor according to any one of claims 1 to 6.