Bearing sleeve insulation structure of variable frequency converter powered permanent magnet motor

Abstract

The utility model discloses a bearing sleeve insulation structure of frequency converter power supply permanent magnet motor relates to bearing sleeve technical field. Its technical scheme main points are: including bearing inner cover, the end face of bearing inner cover is equipped with the first annular groove along its circumferential direction, bearing outer cover is equipped with in the first annular groove, is provided with the insulation cover between bearing inner cover and bearing outer cover, the first annular groove includes annular end face and annular curved surface, the insulation cover includes the first insulation part of being fitted in between annular end face and bearing outer cover end face, and the second insulation part of being sleeved in between annular curved surface and bearing outer cover circumferential inner wall, the end face of bearing outer cover is equipped with the second annular groove along its circumferential outside wall away from the first insulation part. The utility model discloses the purpose in bearing sleeve insulation structure of frequency converter power supply permanent magnet motor is provided.

Description

Technical Field

[0001] This utility model relates to the field of bearing sleeve technology, and more specifically, it relates to a bearing sleeve insulation structure for a frequency converter-powered permanent magnet motor. Background Technology

[0002] In the field of permanent magnet motors, especially those powered by frequency converters, bearing sleeves are traditionally made of metal and lack insulation. Metal bearing sleeves cannot effectively block the shaft current path. Under the influence of high-frequency harmonics generated by the frequency converter, the shaft current flows through the motor end cover and into the bearing, causing electrochemical corrosion (electrolytic erosion) of the bearing, severely shortening its service life and affecting motor reliability.

[0003] Existing technical solutions use insulating coatings, but after prolonged use, the coatings can wear down or even peel off, thus affecting their insulation performance.

[0004] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a bearing sleeve insulation structure for a frequency converter-powered permanent magnet motor.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a bearing sleeve insulation structure for a frequency converter-powered permanent magnet motor, comprising an inner bearing sleeve, a bearing disposed within the inner bearing sleeve, a first annular groove formed along the circumferential direction on the end face of the inner bearing sleeve, an outer bearing sleeve disposed within the first annular groove, an insulating sleeve disposed between the inner bearing sleeve and the outer bearing sleeve, the first annular groove comprising an annular end face and an annular arc surface, the insulating sleeve comprising a first insulating portion fitting between the annular end face and the end face of the outer bearing sleeve, and a second insulating portion disposed between the annular arc surface and the inner circumferential wall of the outer bearing sleeve, a second annular groove formed along the outer circumferential wall on the end face of the outer bearing sleeve away from the first insulating portion, a tail end cover plate disposed within the second annular groove, and an outer bearing cover fixedly connected to the tail end of the inner bearing sleeve.

[0007] The present invention is further configured such that: a plurality of positioning pins are uniformly arranged on the surface of the annular arc surface along its circumference, and a plurality of first positioning holes for the positioning pins to be inserted are provided on the first insulating part.

[0008] The present invention is further configured such that: the end face of the bearing outer sleeve facing the first insulating part is provided with a plurality of second positioning holes for the insertion of positioning pins.

[0009] The present invention is further configured such that: the second insulating part is provided with an insulating ring between the bearing outer sleeve and the bearing outer cover.

[0010] The present invention is further configured such that: a third annular groove that matches the second annular groove is formed on one side end face of the tail end cover along its circumferential inner wall, and the insulating ring is located on the outer end face of the tail end cover.

[0011] The present invention is further configured such that: a fourth annular groove for installing the bearing is formed along the inner circumference of the end face of the bearing inner sleeve facing the bearing outer cover; a fifth annular groove is formed along the inner circumference of the fourth annular groove on the end face of the bearing inner sleeve facing the bearing outer cover; the distance between the end faces of the fourth annular groove and the fifth annular groove is equal to the width of the bearing; and an abutment ring is provided on the end face of the bearing outer cover, which abuts against the end face of the fifth annular groove and the end face of the bearing.

[0012] The present invention is further configured such that: an oil injection groove is provided inside the bearing inner sleeve and the bearing outer cover, one end of the oil injection groove passes through the outer circumferential wall of the bearing outer cover, and the other end is connected to the inner circumferential wall of the bearing inner sleeve and faces the bearing.

[0013] The present invention has the following advantages: the tail end cover is installed in the second annular groove of the bearing outer sleeve. By setting an insulating sleeve between the bearing inner sleeve and the bearing outer sleeve, the current on the tail end cover can be isolated from flowing through the bearing outer sleeve to the bearing inner sleeve, thereby reducing the electro-erosion of the bearing and improving its service life. Compared with the insulating coating, the insulating sleeve is made of epoxy resin, which has a long service life and can maintain the insulating effect for a long time. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a half-section structure in this embodiment; Figure 2 This is a schematic diagram of the bearing inner sleeve in this embodiment; Figure 3 This is a schematic diagram of the insulating sleeve in this embodiment; Figure 4 This is a half-sectional view of the bearing outer sleeve in this embodiment; Figure 5 This is a magnified view of part A in the diagram; Figure 6 This is a schematic diagram of the tail end cover plate in this embodiment; Figure 7 This is a schematic diagram of the bearing cover in this embodiment.

[0015] Figure descriptions: 1. Inner sleeve of bearing; 2. Bearing; 3. First annular groove; 4. Outer sleeve of bearing; 5. Insulating sleeve; 6. Annular end face; 7. Annular arc surface; 8. First insulating part; 9. Second insulating part; 10. Second annular groove; 11. Tail end cover plate; 12. Outer cover of bearing; 13. Locating pin; 14. First locating hole; 15. Second locating hole; 16. Insulating ring; 17. Third annular groove; 18. Fourth annular groove; 19. Fifth annular groove; 20. Abutment ring; 21. Oil filling groove. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0018] As shown in the figure, a bearing sleeve insulation structure for a frequency converter-powered permanent magnet motor includes an inner bearing sleeve 1, a bearing 2 disposed inside the inner bearing sleeve, a first annular groove 3 formed along the circumferential direction on the end face of the inner bearing sleeve 1, an outer bearing sleeve 4 disposed inside the first annular groove 3, and an insulating sleeve 5 disposed between the inner bearing sleeve 1 and the outer bearing sleeve 4. The first annular groove 3 includes an annular end face 6 and an annular arc surface 7. The insulating sleeve 5 includes a first insulating part 8 fitted between the annular end face 6 and the end face of the outer bearing sleeve 4, and a second insulating part 9 disposed between the annular arc surface 7 and the inner circumferential wall of the outer bearing sleeve 4. A second annular groove 10 is formed along the outer circumferential wall of the end face of the outer bearing sleeve 4 away from the first insulating part 8. A tail end cover plate 11 is disposed inside the second annular groove 10, and an outer bearing cover 12 is fixedly connected to the tail end of the inner bearing sleeve 1.

[0019] The tail end cover 11 is installed in the second annular groove 10 of the bearing outer sleeve 4. By setting an insulating sleeve 5 between the bearing inner sleeve 1 and the bearing outer sleeve 4, the current on the tail end cover 11 can be isolated from flowing through the bearing outer sleeve 4 to the bearing inner sleeve 1, thereby reducing the electrolytic corrosion of the bearing and improving its service life. Compared with the insulating coating, the insulating sleeve 5 is made of epoxy resin, which has a long service life and can maintain the insulating effect for a long time.

[0020] A plurality of positioning pins 13 are evenly arranged along the circumference of the annular arc surface 7, and a plurality of first positioning holes 14 for the positioning pins 13 to be inserted are provided on the first insulating part 8. A plurality of second positioning holes 15 for the positioning pins 13 to be inserted are provided on the end face of the bearing outer sleeve 4 facing the first insulating part 8.

[0021] When installing the insulating sleeve 5 and the bearing outer sleeve 4, the positioning pin 13 is inserted into the first positioning hole 14 and the second positioning hole 15, which facilitates assembly and improves the stability of the connection between the components after installation.

[0022] The second insulating part 9 is fitted with an insulating ring 16 between the bearing outer sleeve 4 and the bearing outer cover 12. A third annular groove 17, which matches the second annular groove 10, is formed along the inner circumference of one end face of the tail end cover 11. The insulating ring 16 is located on the outer end face of the tail end cover 11. By providing the insulating ring 16, insulation is achieved between the bearing outer sleeve 4 and the bearing outer cover 12, preventing electrical conduction between them and avoiding current flowing through the bearing outer cover 12 into the bearing inner sleeve, thus preventing damage to the bearing.

[0023] A fourth annular groove 18 for mounting the bearing is formed along the inner circumference of the end face of the bearing inner sleeve facing the bearing outer cover 12. A fifth annular groove 19 is formed along the inner circumference of the fourth annular groove 18 along the end face of the bearing inner sleeve facing the bearing outer cover 12. The distance between the end faces of the fourth annular groove 18 and the fifth annular groove 19 is equal to the width of the bearing. An abutment ring 20 is provided on the end face of the bearing outer cover 12, which is inserted into the fifth annular groove 19. The abutment ring 20 abuts against the end face of the fifth annular groove 19 and the end face of the bearing. The bearing outer cover 12 and the bearing inner sleeve are fixedly connected by fasteners (such as bolts, not shown in the figure) to ensure the stability of the bearing after installation.

[0024] An oil filling groove 21 is provided inside the bearing inner sleeve and the bearing outer cover 12. One end of the oil filling groove 21 passes through the outer circumference of the bearing outer cover 12, and the other end is connected to the inner circumference of the bearing inner sleeve and faces the bearing, so as to facilitate the addition of lubricating oil to the bearing and make it easy to use.

[0025] The specific embodiments are merely explanations of this utility model and are not intended to limit it. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this utility model.

Claims

1. A bearing sleeve insulation structure for a frequency converter-powered permanent magnet motor, characterized in that: The bearing includes an inner bearing sleeve (1), a bearing (2) is provided inside the inner bearing sleeve, a first annular groove (3) is provided on the circumferential side of the end face of the inner bearing sleeve (1) along its circumferential direction, an outer bearing sleeve (4) is provided inside the first annular groove (3), an insulating sleeve (5) is provided between the inner bearing sleeve (1) and the outer bearing sleeve (4), the first annular groove (3) includes an annular end face (6) and an annular arc surface (7), the insulating sleeve (5) includes a first insulating part (8) that fits between the annular end face (6) and the end face of the outer bearing sleeve (4), and a second insulating part (9) that is sleeved between the annular arc surface (7) and the inner circumferential wall of the outer bearing sleeve (4), a second annular groove (10) is provided on the outer circumferential side of the end face of the outer bearing sleeve (4) away from the first insulating part (8), a tail end cover plate (11) is provided inside the second annular groove (10), and an outer bearing cover (12) is fixedly connected to the tail end of the inner bearing sleeve (1).

2. The bearing sleeve insulation structure of a frequency converter-powered permanent magnet motor according to claim 1, characterized in that: The annular arc surface (7) is uniformly provided with a number of positioning pins (13) along its circumference, and the first insulating part (8) is provided with a number of first positioning holes (14) for the positioning pins (13) to be inserted.

3. The bearing sleeve insulation structure of a frequency converter-powered permanent magnet motor according to claim 2, characterized in that: The bearing outer sleeve (4) has several second positioning holes (15) on the end face facing the first insulating part (8) for the positioning pin (13) to be inserted.

4. The bearing sleeve insulation structure of a frequency converter-powered permanent magnet motor according to claim 3, characterized in that: The second insulating part (9) is located between the bearing outer sleeve (4) and the bearing outer cover (12) and is fitted with an insulating ring (16).

5. The bearing sleeve insulation structure of a frequency converter-powered permanent magnet motor according to claim 4, characterized in that: The tail end cover (11) has a third annular groove (17) that matches the second annular groove (10) along its inner circumference on one side end face, and the insulating ring (16) is located on the outer end face of the tail end cover (11).

6. The bearing sleeve insulation structure of a frequency converter-powered permanent magnet motor according to claim 1, characterized in that: The bearing inner sleeve (1) has a fourth annular groove (18) for installing the bearing (2) along its circumferential inner wall on the end face facing the bearing outer cover (12). The bearing inner sleeve (1) has a fifth annular groove (19) along the circumferential inner wall of the fourth annular groove (18) on the end face facing the bearing outer cover (12). The distance between the end face of the fourth annular groove (18) and the end face of the fifth annular groove (19) is equal to the width of the bearing (2). The end face of the bearing outer cover (12) is provided with an abutment ring (20) that is inserted into the fifth annular groove (19). The abutment ring (20) abuts against the end face of the fifth annular groove (19) and the end face of the bearing (2).

7. The bearing sleeve insulation structure of a frequency converter-powered permanent magnet motor according to claim 1, characterized in that: The inner sleeve (1) and the outer cover (12) of the bearing are provided with an oil injection groove (21). One end of the oil injection groove (21) passes through the outer circumferential wall of the outer cover (12), and the other end is connected to the inner circumferential wall of the inner sleeve (1) and faces the bearing (2).

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