Bearing structure of permanent magnet direct drive motor special for stirrer

Abstract

The utility model relates to a bearing structure of a permanent magnet direct drive motor specially used for a stirrer, comprising a housing provided with a bearing chamber; the main shaft penetrates through the bearing chamber; the main shaft is connected with the inner wall of the bearing chamber through a cylindrical roller bearing and a thrust self-aligning roller bearing which are arranged up and down; the upper part of the main shaft is rotationally connected with the bearing chamber through a cylindrical roller bearing, the lower part of the main shaft is rotationally connected with the bearing chamber through a thrust self-aligning roller bearing, and the thrust self-aligning roller bearing plays a role in supporting the axial force of the bearing, so that the main shaft can be supported, and the main shaft can rotate relative to the bearing chamber; the cylindrical roller bearing can limit the radial force of the main shaft, the thrust self-aligning roller bearing cannot be eccentric, uneven stress of rollers in the thrust self-aligning roller bearing is avoided, the cylindrical roller bearing does not limit axial movement of the main shaft, and in conclusion, on the premise that the main shaft cannot bear the axial force in the stirring working condition, the axial movement of the main shaft is not limited by the cylindrical roller bearing. And eccentricity of the thrust self-aligning roller bearing is prevented.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a bearing structure for a permanent magnet direct-drive motor dedicated to a stirrer. Background Art

[0002] The main shaft of the agitator motor is often connected to a stirring shaft with stirring blades. During the stirring process of the fluid, the stirring shaft will be subjected to the reverse force of the fluid, causing the stirring shaft and the main shaft to move upward;

[0003] The conventional bearing chamber is connected to the main shaft through a thrust spherical roller bearing, and the tail of the main shaft is connected to the housing through a deep groove ball bearing. If the thrust spherical roller bearing is used, the main shaft will be subjected to reverse axial force during stirring operation. Under the action of the axial force, the main shaft will move radially, which will cause the inner and outer rings of the thrust spherical roller bearing to separate. Under the action of the radial force of the stirring impeller, the bearing will be eccentric, the rollers in the thrust spherical roller bearing will be unevenly stressed and cannot be reset automatically. The bearing will overheat during the rotation of the main shaft, resulting in bearing damage.

[0004] In summary, in mixing conditions, under the premise that the main shaft cannot avoid bearing axial force, how to prevent the thrust spherical roller bearing from being eccentric has become an urgent problem that researchers in this field need to solve. Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to prevent the eccentricity of the thrust spherical roller bearing under the premise that the main shaft cannot avoid bearing the axial force in the mixing working condition;

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] The utility model is a bearing structure for a permanent magnet direct-drive motor dedicated to a stirrer, comprising: a housing having a bearing chamber; a main shaft passing through the bearing chamber; wherein the main shaft is connected to the inner wall of the bearing chamber by cylindrical roller bearings and thrust spherical roller bearings arranged up and down; the cylindrical roller bearings limit the radial movement of the main shaft; the thrust spherical roller bearings provide axial support force for the main shaft;

[0008] The upper part of the main shaft is rotatably connected to the bearing chamber through a cylindrical roller bearing, and the lower part of the main shaft is rotatably connected to the bearing chamber through a thrust spherical roller bearing. The thrust spherical roller bearing plays a role in supporting the axial force of the bearing, so that it can both support the main shaft and realize the rotation of the main shaft relative to the bearing chamber; the cylindrical roller bearing can limit the radial force of the main shaft, that is, the main shaft can only move axially. In this way, although the thrust spherical roller bearing will still be disengaged, it can be reset under the action of the gravity of the main shaft and the stirring shaft. The thrust spherical roller bearing will not be eccentric, thus avoiding uneven force on the rollers in the thrust spherical roller bearing, and the cylindrical roller bearing does not limit the axial movement of the main shaft. In summary, in the stirring condition, the thrust spherical roller bearing is prevented from being eccentric under the premise that the main shaft cannot avoid being subjected to axial force.

[0009] In order to illustrate the installation position of the thrust spherical roller bearing, the bearing chamber adopted in the utility model includes: an upper steel sleeve and a lower steel sleeve positioned up and down; an inner oil cover connected to the upper steel sleeve; the bottom of the lower steel sleeve has a first step surface; the main shaft is provided with a second step surface near the first step surface; the outer ring of the thrust spherical roller bearing is supported and positioned at the first step surface, and the inner ring of the thrust spherical roller bearing is supported against the second step surface.

[0010] The first step surface of the lower steel sleeve and the second step surface on the main shaft are used to support the outer ring and inner ring of the thrust spherical roller bearing respectively. The main shaft is supported on the top of the inner ring of the thrust spherical roller bearing through the second step surface, thereby realizing the installation of the thrust spherical roller bearing. The thrust spherical roller bearing bears the axial force of the main shaft.

[0011] In order to illustrate the installation of the cylindrical roller bearing, the utility model adopts a third step surface formed on the inner wall of the upper steel sleeve; a retaining ring is arranged on the main shaft; the inner ring support of the cylindrical roller bearing is positioned on the retaining ring, and the outer ring support of the cylindrical roller bearing is positioned on the third step surface; the bottom of the inner oil cover is provided with a first stop that abuts against the outer ring of the cylindrical roller bearing.

[0012] The outer ring of the cylindrical roller bearing is supported at the third step surface, the inner ring is supported at the retaining ring, the inner oil cover fixing cover is arranged on the top of the upper steel sleeve, and the first stop of the inner oil cover abuts against the outer ring of the cylindrical roller bearing to limit the upward movement of the outer ring of the cylindrical roller bearing.

[0013] How to realize the positioning connection between the upper steel sleeve and the lower steel sleeve, the utility model adopts that the bottom of the upper steel sleeve has a second stopper positioned with the top of the lower steel sleeve, and the upper steel sleeve and the lower steel sleeve are connected by bolts;

[0014] The lower steel sleeve and the upper steel sleeve are positioned and connected by the second stop, and then the upper steel sleeve and the lower steel sleeve are fixedly connected by bolts. Such a bearing chamber is a split structure. Since the outer diameters of the thrust spherical roller bearing and the cylindrical roller bearing are consistent or close, the cylindrical roller bearing and the thrust spherical roller bearing can be installed respectively by the split upper steel sleeve and the lower steel sleeve, and then the upper steel sleeve and the lower steel sleeve are fixed by bolts.

[0015] During the installation process, first place the thrust spherical roller bearing on the lower steel sleeve, then fix the upper and lower steel sleeves, place the cylindrical roller bearing on the upper steel sleeve, and finally install the inner oil cover.

[0016] The beneficial effects of the utility model are as follows: the utility model is a bearing structure for a permanent magnet direct-drive motor specially used for an agitator, the upper part of the main shaft is rotatably connected to the bearing chamber through a cylindrical roller bearing, and the lower part of the main shaft is rotatably connected to the bearing chamber through a thrust spherical roller bearing, and the thrust spherical roller bearing plays a role in supporting the axial force of the bearing, so that both the support of the main shaft and the rotation of the main shaft relative to the bearing chamber can be achieved; the cylindrical roller bearing can limit the radial force of the main shaft, that is, the main shaft can only move axially, so that although the thrust spherical roller bearing will still be disengaged, it can be reset under the action of the gravity of the main shaft and the agitator shaft, the thrust spherical roller bearing will not be eccentric, and uneven force on the rollers in the thrust spherical roller bearing is avoided, and the cylindrical roller bearing does not limit the axial movement of the main shaft. In summary, the radial movement of the main shaft is limited by setting the cylindrical roller bearing, so that the eccentricity of the thrust spherical roller bearing is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a cross-sectional view of the utility model;

[0019] Figure 2 yes Figure 1 A magnified view of point A;

[0020] In the figure: 1-housing, 2-bearing chamber, 3-spindle, 4-cylindrical roller bearing, 5-thrust spherical roller bearing, 6-first step surface, 7-second step surface, 8-third step surface, 9-retaining ring, 10-inner oil cover, 11-first stop, 12-adjusting clearance, 13-second stop. DETAILED DESCRIPTION

[0021] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0022] like Figure 1-2As shown, the utility model is a bearing structure for a permanent magnet direct-drive motor dedicated to a stirrer, comprising: a housing 1, which has a bearing chamber 2; a main shaft 3, which passes through the bearing chamber 2; wherein the main shaft 3 is connected to the inner wall of the bearing chamber 2 by cylindrical roller bearings 4 and thrust spherical roller bearings 5 ​​arranged up and down; the cylindrical roller bearings 4 limit the radial movement of the main shaft 3; the thrust spherical roller bearings 5 ​​provide axial support force for the main shaft 3;

[0023] The upper part of the main shaft is rotatably connected to the bearing chamber through a cylindrical roller bearing, and the lower part of the main shaft is rotatably connected to the bearing chamber through a thrust spherical roller bearing. The thrust spherical roller bearing plays a role in supporting the axial force of the bearing, so that it can both support the main shaft and realize the rotation of the main shaft relative to the bearing chamber; the cylindrical roller bearing can limit the radial force of the main shaft, that is, the main shaft can only move axially. In this way, although the thrust spherical roller bearing will still be disengaged, it can be reset under the action of the gravity of the main shaft and the stirring shaft. The thrust spherical roller bearing will not be eccentric, thus avoiding uneven force on the rollers in the thrust spherical roller bearing, and the cylindrical roller bearing does not limit the axial movement of the main shaft. In summary, in the stirring condition, the thrust spherical roller bearing is prevented from being eccentric under the premise that the main shaft cannot avoid being subjected to axial force.

[0024] like Figure 2 As shown, in order to illustrate the installation position of the thrust spherical roller bearing, the bearing chamber adopted in the utility model includes: an upper steel sleeve 21 and a lower steel sleeve 22 positioned in an upper and lower manner; an inner oil cover 10 connected to the upper steel sleeve 21; the bottom of the lower steel sleeve 22 has a first step surface 6; the main shaft 3 is provided with a second step surface 7 near the first step surface 6; the outer ring of the thrust spherical roller bearing 5 is supported and positioned at the first step surface 6, and the inner ring of the thrust spherical roller bearing 5 is supported against the second step surface 7.

[0025] The first step surface of the lower steel sleeve and the second step surface on the main shaft are used to support the outer ring and inner ring of the thrust spherical roller bearing respectively. The main shaft is supported on the top of the inner ring of the thrust spherical roller bearing through the second step surface, thereby realizing the installation of the thrust spherical roller bearing. The thrust spherical roller bearing bears the axial force of the main shaft.

[0026] like Figure 2 As shown, in order to illustrate the installation of the cylindrical roller bearing, the utility model adopts the upper steel sleeve 21 with a third step surface 8 on the inner wall; the main shaft 3 is provided with a retaining ring 9; the inner ring support of the cylindrical roller bearing 4 is positioned on the retaining ring 9, and the outer ring support of the cylindrical roller bearing 4 is positioned at the third step surface 8; the bottom of the inner oil cover 10 is provided with a first stop 11 that abuts against the outer ring of the cylindrical roller bearing 4.

[0027] The outer ring of the cylindrical roller bearing is supported at the third step surface, the inner ring is supported at the retaining ring, the inner oil cover fixing cover is arranged on the top of the upper steel sleeve, and the first stop of the inner oil cover abuts against the outer ring of the cylindrical roller bearing to limit the upward movement of the outer ring of the cylindrical roller bearing.

[0028] like Figure 2 As shown, how to realize the positioning connection between the upper steel sleeve and the lower steel sleeve, the utility model adopts that the bottom of the upper steel sleeve 21 has a second stop 13 and is positioned with the top of the lower steel sleeve 22, and the upper steel sleeve 21 and the lower steel sleeve 22 are connected by bolts;

[0029] The lower steel sleeve and the upper steel sleeve are positioned and connected by the second stop to ensure that the lower steel sleeve and the upper steel sleeve are not eccentric, and then the upper steel sleeve and the lower steel sleeve are fixedly connected by bolts. Such a bearing chamber is a split structure. Since the outer diameters of the thrust spherical roller bearing and the cylindrical roller bearing are consistent or close, the cylindrical roller bearing and the thrust spherical roller bearing can be installed respectively by the split upper steel sleeve and the lower steel sleeve, and then the upper steel sleeve and the lower steel sleeve are fixed by bolts;

[0030] During the installation process, first place the thrust spherical roller bearing on the lower steel sleeve, then fix the upper and lower steel sleeves, place the cylindrical roller bearing on the upper steel sleeve, and finally install the inner oil cover and connect it to the upper steel sleeve.

[0031] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bearing structure for a permanent magnet direct drive motor for a stirrer, characterized in that: include: a housing having a bearing chamber; a main shaft passing through the bearing chamber; Wherein, the main shaft is connected to the inner wall of the bearing chamber through cylindrical roller bearings and thrust spherical roller bearings arranged up and down; The cylindrical roller bearing limits the radial movement of the main shaft; The thrust spherical roller bearing provides axial support force for the main shaft.

2. The bearing structure for a permanent magnet direct drive motor for a stirrer according to claim 1, characterized in that: The bearing chamber comprises: an upper steel sleeve and a lower steel sleeve which are arranged in an upper and lower position; An inner oil cover connected to the upper steel sleeve; The bottom of the lower steel sleeve has a first step surface; The main shaft is provided with a second step surface near the first step surface; The outer ring of the thrust spherical roller bearing is supported on the first step surface, and the inner ring of the thrust spherical roller bearing is supported against the second step surface.

3. The bearing structure for a permanent magnet direct drive motor for a stirrer according to claim 2, characterized in that: The inner wall of the upper steel sleeve is provided with a third step surface; A retaining ring is arranged on the main shaft; The inner ring support of the cylindrical roller bearing is positioned on the retaining ring, and the outer ring support of the cylindrical roller bearing is positioned on the third step surface; The bottom of the inner oil cover is provided with a first stopper which abuts against the outer ring of the cylindrical roller bearing.

4. The bearing structure for a permanent magnet direct drive motor for a stirrer according to claim 3, characterized in that: The bottom of the upper steel sleeve is provided with a second stopper for positioning with the top of the lower steel sleeve, and the upper steel sleeve and the lower steel sleeve are connected by bolts.

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