A bearing replacement device for a permanent magnet motor

Abstract

This utility model relates to a bearing replacement device for a permanent magnet motor, belonging to the technical field of motor maintenance equipment. The device includes a motor end cover and a bearing assembly detachably mounted on the motor end cover, the bearing assembly supporting the motor shaft. Several bearing replacement devices are evenly distributed along the circumference of the motor shaft. Each bearing replacement device includes a support rib, one end of which is mounted on the motor end cover, and the other end has a threaded hole for installing a support bolt. The motor end cover has several operating windows through which the support bolt can be adjusted to support the motor shaft. The bearing assembly includes an outer bearing end cover, an inner bearing end cover, and a bearing sleeve with lifting lugs, connected to the motor end cover by connecting bolts passing through the lifting lugs. The device also includes reinforcing ribs to enhance the strength of the support ribs. This utility model has a simple structure, is easy to operate, and allows for quick bearing replacement without disassembling the motor, improving maintenance efficiency and reducing maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of motor equipment, and more specifically to a bearing replacement device for a permanent magnet motor. Background Technology

[0002] Permanent magnet motors have advantages such as high efficiency, high power density, and simple structure, and are widely used in wind power generation, industrial drives, and other fields. As the application scope of permanent magnet motors continues to expand, their maintenance and upkeep issues are becoming increasingly prominent, especially the replacement of bearings.

[0003] During the operation of a permanent magnet motor, the bearing, as a key component supporting the motor rotor, bears a huge mechanical load. After long-term operation, it is prone to wear and aging, requiring periodic replacement. However, because the permanent magnet motor rotor contains permanent magnets and is relatively large and heavy, there is a strong attraction between the stator and rotor, making bearing replacement extremely difficult.

[0004] The following problems still exist in the existing technology: First, most bearing replacement methods require the use of special tooling, which increases maintenance costs and complexity; second, some methods require the motor to be returned to the factory for repair, making it impossible to quickly replace the bearing on site; third, existing bearing replacement devices are often complex in structure and inconvenient to operate, especially when the equipment is used at a limited location; finally, due to the strong magnetic attraction between the rotor and stator of the permanent magnet motor, the rotor is prone to runaway during bearing disassembly, causing safety hazards or damaging other parts of the motor.

[0005] Therefore, there is an urgent need for a bearing replacement device for permanent magnet motors that is simple in structure, easy to operate, and can quickly replace bearings on-site, in order to solve the problem of difficult bearing replacement for medium and large permanent magnet motors. Utility Model Content

[0006] To address the difficulty of replacing bearings in medium and large permanent magnet motors and to enable convenient bearing replacement at the equipment site, thereby saving costs and time, this invention provides a bearing replacement device for permanent magnet motors.

[0007] The technical problem this invention aims to solve is to provide a bearing replacement device for a permanent magnet motor, addressing the shortcomings of existing technologies. Because the rotor of a permanent magnet motor contains magnets and is relatively large and heavy, there is a significant attraction between the stator and rotor. Replacing the bearings is not as simple as with ordinary motors; they easily attract each other, making separation very difficult. This is especially problematic in on-site conditions, sometimes requiring the motor to be returned to the manufacturer, increasing maintenance costs and time.

[0008] The technical solution adopted by the present invention to solve its technical problem is as follows: a bearing replacement device for a permanent magnet motor is provided, including a motor end cover, a bearing assembly detachably mounted on the motor end cover, the bearing assembly being used to support the motor shaft, and a plurality of bearing replacement devices being evenly distributed around the motor shaft. Each bearing replacement device includes a support rib, one end of which is mounted on the motor end cover, and the other end has a threaded hole for installing a support bolt. The motor end cover has a plurality of operating windows, through which the support bolt is adjusted to support the motor shaft.

[0009] Preferably, the bearing assembly includes an outer bearing end cover, an inner bearing end cover, and a bearing sleeve. The bearing sleeve is provided with a lifting lug, and the bearing assembly is connected to the motor end cover by connecting bolts passing through the lifting lug.

[0010] Preferably, the bearing outer cover is detachably connected to the bearing sleeve, and the bearing sleeve is detachably connected to the bearing inner end cover or is integrally formed.

[0011] Preferably, the bearing assembly can be completely disassembled after the connecting bolts are unlocked.

[0012] Preferably, the operation window is located between two adjacent bearing replacement devices and is not opposite to the bearing replacement device.

[0013] Preferably, the distance between the operation window and the bearing replacement device is such that either bearing replacement device on the left or right side of the operation window can be touched with one hand.

[0014] Preferably, it also includes a reinforcing rib, one end of which is connected to the supporting rib and the other end of which is connected to the motor end cover, for strengthening the supporting rib.

[0015] Preferably, the bearing replacement device includes a locking nut for locking the support bolt and the support rib.

[0016] The beneficial effects of this invention are as follows: By setting a circumferentially distributed bearing replacement device on the motor end cover, including support ribs, support bolts, and locking nuts, the motor rotor can be fixed by adjusting the support bolts to tighten the motor shaft through the operating window during bearing replacement. This avoids the stator and rotor being attracted together by magnetic force, which would make replacement difficult. The operating window allows for convenient operation with both hands simultaneously, eliminating the need for single-handed operation in confined spaces, thus improving operational convenience. The structure is simple, requiring no additional tooling or large lifting equipment, and does not require disassembling the entire motor. Bearings can be easily replaced on-site, significantly saving cost and time. Compared with existing technologies, this invention solves the problem of difficult bearing replacement in medium and large permanent magnet motors, improves maintenance efficiency, and reduces maintenance costs. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of a bearing replacement device for a permanent magnet motor according to this application.

[0019] Figure 2 This is a schematic diagram of the motor end cover of a bearing replacement device for a permanent magnet motor according to this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In this specification, identical parts are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0022] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] like Figure 1 , Figure 2 As shown, a bearing replacement device for a permanent magnet motor includes a motor end cover 1, a bearing assembly, a bearing replacement device, and an operation window 11.

[0025] The motor end cover 1, as an external structural component of the permanent magnet motor, is used to enclose the internal space of the motor and support the bearing assembly. The bearing assembly is detachably mounted on the motor end cover 1 to support the motor shaft 2. The bearing assembly includes an outer bearing end cover 7, an inner bearing end cover 9, and a bearing sleeve 8. The bearing sleeve 8 is equipped with lifting lugs, and the bearing assembly is connected to the motor end cover 1 via connecting bolts 10. The outer bearing cover and the bearing sleeve 8 are detachably connected for easy maintenance and replacement. The bearing sleeve 8 and the inner bearing end cover 9 can be detachably connected or integrally formed, depending on the specific application requirements. When bearing replacement is needed, the motor shaft 2 is first fixed using the bearing replacement device, and then the connecting bolts 10 are unlocked, allowing the bearing assembly to be disassembled as a whole, greatly simplifying the bearing replacement process.

[0026] Several bearing replacement devices are evenly distributed along the circumference of the motor shaft 2 to ensure uniform support force on the motor shaft 2. Each bearing replacement device includes a support rib 3, one end of which is mounted on the motor end cover 1, and the other end has a threaded hole. The threaded hole is used to install a support bolt 5, which connects to the support rib 3 through the threaded hole to support the motor shaft 2 during bearing replacement. The bearing replacement device also includes a lock nut 6, which is used to lock the support bolt 5 and the support rib 3, preventing the support bolt 5 from loosening during use.

[0027] Several operating windows 11 are provided on the motor end cover 1. These operating windows 11 are located between two adjacent bearing replacement devices and are not opposite to the bearing replacement devices. The distance between the operating window 11 and the bearing replacement device is designed to be reasonable, at least allowing one hand to access either bearing replacement device on the left or right side of the operating window 11, so that the operator can adjust the support bolts 5 through the operating window 11 to support the motor shaft 2.

[0028] The working principle of the permanent magnet motor bearing replacement device in this embodiment is as follows: When the bearing needs to be replaced, firstly, adjust the support bolt 5 through the operation window 11 so that the support bolt 5 contacts the motor shaft 2 and provides support force. After the support bolt 5 is adjusted to the correct position, use the lock nut 6 to lock the support bolt 5 to the support rib 3 to ensure that the position of the support bolt 5 is fixed. Then, loosen the bolts connecting the outer end cover 7 of the bearing, the bearing sleeve 8, and the inner end cover 9 of the bearing so that the outer end cover 7 and the inner end cover 9 of the bearing are simultaneously separated from the bearing sleeve 8. Then, unlock the connecting bolt 10 to separate the bearing sleeve 8 from the motor end cover 1. At this time, the entire bearing assembly can be easily removed from the motor shaft 2 for replacement. After replacing the new bearing, reinstall the bearing assembly onto the motor end cover 1 and fix it with the connecting bolt 10. Finally, loosen the lock nut 6, adjust the support bolt 5 to separate it from the motor shaft 2, and complete the bearing replacement operation.

[0029] The permanent magnet motor bearing replacement device of this embodiment has the following advantages:

[0030] First, by setting a detachable bearing assembly on the motor end cover 1, the replacement of the bearing becomes simple and quick.

[0031] Secondly, the bearing replacement device, which is evenly distributed around the circumference of the motor shaft 2, can provide uniform support force to the motor shaft 2 during the bearing replacement process, preventing the motor shaft 2 from shifting or being damaged due to gravity.

[0032] Furthermore, the operating window 11 on the motor end cover 1 is located between two adjacent bearing replacement devices, facilitating the operator to adjust the support bolts 5 through the operating window 11. The distance between the operating window 11 and the bearing replacement device is reasonably designed to meet the requirements of single-handed operation, thus improving the convenience of operation.

[0033] Example 2

[0034] Based on Embodiment 1, the bearing assembly structure in this embodiment has been optimized. The outer bearing end cap 7 and the bearing sleeve 8 are connected by bolts, facilitating disassembly and installation. The bearing sleeve 8 and the inner bearing end cap 9 are integrally molded, reducing the number of parts and improving structural stability.

[0035] When the bearing needs to be replaced, first adjust the support bolt 5 through the operation window 11 so that it contacts the motor shaft 2 and provides support. Then, unlock the connecting bolt 10 and disassemble the bearing assembly as a whole. After removing the bearing cover, the bearing can be replaced directly. After replacement, reinstall the bearing assembly and secure it with the connecting bolt 10. Finally, adjust the support bolt 5 to separate it from the motor shaft 2, completing the bearing replacement operation.

[0036] The bearing assembly structure design in this embodiment further simplifies the bearing replacement process and improves maintenance efficiency. The design of the bearing sleeve 8 and the inner end cover 9 being integrally formed reduces the number of parts and lowers manufacturing and assembly costs.

[0037] Example 3

[0038] Based on Embodiment 1, the design of the operation window 11 in this embodiment has been optimized. Six operation windows 11 are provided on the motor end cover 1. These operation windows 11 are evenly distributed in the circumferential direction of the motor end cover 1. Each operation window 11 is located between two adjacent bearing replacement devices and is not opposite to the bearing replacement device.

[0039] The distance between the operating window 11 and the bearing replacement device is designed to allow one hand to access either the left or right side of the operating window 11 for the bearing replacement device. This design allows operators to simultaneously adjust the bearing replacement devices on both sides through one operating window 11, and also allows them to reach into two adjacent operating windows 11 with their left and right hands respectively to maintain the bearing replacement device located between two adjacent operating windows 11, thus improving operational efficiency.

[0040] The design of the operating window 11 in this embodiment optimizes the operator's working space and improves the ease of operation during bearing replacement. The design of the number and distribution of the operating windows 11 ensures that the operator can easily access all bearing replacement devices, achieving all-round support for the motor shaft 2. The size design of the operating windows 11 takes into account ergonomic principles, ensuring that the operator's hands can comfortably reach into the operating window 11 to operate, reducing discomfort during the operation process.

[0041] Example 4

[0042] Based on Embodiment 1, the bearing replacement device structure in this embodiment has been optimized. The bearing replacement device includes a support rib 3, a support bolt 5, a locking nut 6, and a reinforcing rib 4. One end of the reinforcing rib 4 is connected to the support rib 3, and the other end is connected to the motor end cover 1, forming a triangular support structure, which greatly improves the strength of the support rib 3.

[0043] The bearing replacement device in this embodiment features an optimized structural design that improves the device's strength and stability. The use of reinforcing rib 4 significantly enhances the strength of the supporting rib 3, ensuring that the supporting rib 3 and supporting bolt 5 have sufficient strength to withstand the weight of the motor shaft 2 without deformation or damage. The locking nut 6 solves the problem of loosening of the supporting bolt 5 under vibration, thus improving the device's reliability.

[0044] In the embodiments disclosed in this application, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0045] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A bearing replacement device for a permanent magnet motor, characterized in that, include: The motor end cover includes a bearing assembly that can be detachably mounted on it. The bearing assembly supports the motor shaft. Several bearing replacement devices are evenly distributed around the circumference of the motor shaft. Each bearing replacement device includes a support rib. One end of the support rib is mounted on the motor end cover, and the other end has a threaded hole for installing a support bolt. The motor end cover has several operating windows through which the support bolts are adjusted to support the motor shaft.

2. The bearing replacement device for a permanent magnet motor as described in claim 1, characterized in that: The bearing assembly includes an outer bearing end cover, an inner bearing end cover, and a bearing sleeve. The bearing sleeve is provided with a lifting lug, and the bearing assembly is connected to the motor end cover by connecting bolts passing through the lifting lug.

3. The bearing replacement device for a permanent magnet motor as described in claim 2, characterized in that: The bearing outer cover is detachably connected to the bearing sleeve, and the bearing sleeve is detachably connected to the bearing inner end cover or integrally formed.

4. The bearing replacement device for a permanent magnet motor as described in claim 3, characterized in that: After the connecting bolts are unlocked, the bearing assembly can be disassembled as a whole.

5. The bearing replacement device for a permanent magnet motor as described in claim 1, characterized in that: The operation window is located between two adjacent bearing replacement devices and is not opposite to the bearing replacement devices.

6. The bearing replacement device for a permanent magnet motor as described in claim 5, characterized in that: The distance between the operation window and the bearing replacement device is such that either bearing replacement device on the left or right side of the operation window can be touched with one hand.

7. The bearing replacement device for a permanent magnet motor as described in claim 1, characterized in that: It also includes a reinforcing rib, one end of which is connected to the supporting rib and the other end of which is connected to the motor end cover, for strengthening the supporting rib.

8. The bearing replacement device for a permanent magnet motor as described in claim 1, characterized in that: The bearing replacement device includes a locking nut, which is used to lock the support bolt and the support rib.

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