Large electric machine bearing replacement structure and method of use

Abstract

This invention provides a structure and method for online bearing replacement in large motors, relating to the technical field of bearing replacement in large motors. The online bearing replacement structure for large motors includes a motor housing, a motor body, motor end covers, a positioning support ring seat, and support components. The motor body is housed within the motor housing, with motor end covers at both ends. Bearing mounting seats are provided on the end covers, and bearings for supporting the main shaft of the motor body are housed within these mounting seats. The positioning support ring seat is fixedly mounted on the motor end covers, located inside the motor housing, and has multiple mounting holes for installing the support components. During online bearing replacement, multiple support components can abut against the outer wall of the main shaft. Multiple working channels are provided on the motor end covers. This achieves the technical effect of convenient bearing replacement in large motors.

Description

Technical Field

[0001] This invention relates to the field of bearing replacement technology for large motors, and more specifically, to a structure for online bearing replacement in large motors and its usage method. Background Technology

[0002] The core challenges in replacing the bearings of a high-torque permanent magnet motor are "anti-magnetism" and "alignment". The simplified steps are as follows: The key risk is the strong magnetic attraction. There is an extremely strong radial attraction between the permanent magnet rotor and the stator. It is strictly forbidden to directly pull the rotor away; otherwise, the rotor will instantly stick to the stator, damaging the magnets or pinching your fingers.

[0003] The simplified operation procedure for replacing the bearing of a high-torque permanent magnet motor in the existing technology is as follows: Preparation: Use non-magnetic tools (such as copper rods or stainless steel tools), clean the environment, and prevent the removal of iron filings. Then, perform core removal (the most difficult part). A special guide bracket or rail must be used, and the rotor must be slowly and evenly pulled out using lifting equipment to ensure a uniform air gap between the rotor and stator. Next, disassemble: Use a hydraulic puller to remove the old bearing. If heating is required, be sure to take heat insulation measures for the rotor magnets to prevent demagnetization due to high temperatures. Then, install: Use an induction heater to heat the new bearing to approximately 100°C, then quickly fit it onto the journal and align the shoulders. Finally, reassemble: Again, use a guide bracket to return the rotor, and use a dial indicator to check the end cover alignment to ensure smooth rotation.

[0004] The existing process for replacing bearings in high-torque permanent magnet motors is time-consuming, labor-intensive, and carries unexpected risks. Summary of the Invention

[0005] The purpose of this invention is to provide a structure and method for replacing bearings in large motors online, so as to alleviate the technical problem of time-consuming and labor-intensive bearing replacement in large motors in the prior art.

[0006] In a first aspect, embodiments of the present invention provide an online bearing replacement structure for a large motor, comprising a motor housing, a motor body, a motor end cover, a positioning support ring seat, and a support component; The motor body is disposed inside the motor housing, and motor end caps are provided at both ends of the motor housing. Bearing mounting seats are provided on the motor end caps, and bearings for supporting the main shaft of the motor body are provided in the bearing mounting seats. The positioning support ring seat is fixedly mounted on the motor end cover. The positioning support ring seat is located inside the motor housing. The positioning support ring seat has multiple mounting holes for mounting the support components. When the bearing is replaced online, the multiple support components can abut against the outer wall of the spindle. The motor end cover has multiple working channels.

[0007] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the plurality of working channels are uniformly distributed along the circumference of the motor end cover.

[0008] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the motor end cover is provided with a first shielding ring cover for covering the working channel.

[0009] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the motor end cover is provided with a second shielding ring cover for covering the bearing mounting seat, and the second shielding ring cover is provided with a sealing ring for fitting with the spindle.

[0010] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the axis of the positioning support ring coincides with the axis of the main shaft, and the intersection of the axes of the plurality of mounting holes is located on the axis of the main shaft.

[0011] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the mounting hole is a threaded connection hole, and the support member is threadedly installed in the mounting hole.

[0012] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the motor end cover has a detachable bearing seat plate, and the bearing mounting seat is formed on the bearing seat plate; The second shielding ring cover is detachably mounted on the bearing seat plate.

[0013] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the bearing housing plate is provided with a lubricating oil passage for lubricating the bearing.

[0014] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the main shaft is provided with a mounting shoulder for mounting the bearing, and the main shaft is provided with a locking ring for locking the bearing.

[0015] Secondly, embodiments of the present invention provide a method for online bearing replacement in a large motor, for use in an online bearing replacement structure for the large motor, comprising the following steps: Remove the first and second shielding ring covers; Tighten the support components through the working channel so that multiple support components abut against the spindle; Remove the locking ring; The bearing can be disassembled individually for maintenance and installation, or the bearing housing plate can be disassembled for overall maintenance and installation.

[0016] Beneficial effects: This invention provides an online bearing replacement structure for a large motor, including a motor housing, a motor body, motor end covers, a positioning support ring seat, and support components. The motor body is disposed within the motor housing, and motor end covers are provided at both ends of the motor housing. Bearing mounting seats are provided on the motor end covers, and bearings for supporting the main shaft of the motor body are disposed within the bearing mounting seats. The positioning support ring seat is fixedly disposed on the motor end covers and is located inside the motor housing. The positioning support ring seat has multiple mounting holes for installing support components, allowing multiple support components to abut against the outer wall of the main shaft during online bearing replacement. Multiple working channels are provided on the motor end covers.

[0017] Specifically, during use, the operator drives the support components on the positioning support ring seat through the working channel on the motor end cover, so that multiple support components abut against the main shaft of the motor body, thereby supporting the main shaft. Then, the shaft located in the bearing mounting seat is disassembled for maintenance. With this setup, it is not necessary to completely disassemble the motor body and related components, which can greatly simplify the on-site operation procedures, effectively shorten the equipment downtime for maintenance, significantly reduce the cost of manpower and material consumption, and improve maintenance efficiency.

[0018] This invention provides a method for online bearing replacement in large motors, comprising the following steps: removing a first and second shielding ring cover; tightening the support members through the working channel so that multiple support members abut against the main shaft; removing the locking ring; and individually disassembling the bearing for maintenance and installation, or disassembling the bearing seat plate for overall maintenance and installation. This online bearing replacement method for large motors has the advantages described above compared to existing technologies, which will not be elaborated further here. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an online bearing replacement structure for a large electric motor provided in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the online bearing replacement structure for a large electric motor provided in an embodiment of the present invention; Figure 3 A cross-sectional view of the motor end cover, positioning support ring seat, and support member in the large motor online bearing replacement structure provided in an embodiment of the present invention; Figure 4This is an internal sectional view of the motor end cover, positioning support ring seat, and support component in the large motor online bearing replacement structure provided in an embodiment of the present invention.

[0021] icon: 100 - Motor housing; 200 - Motor body; 210 - Main shaft; 220 - Locking ring; 300-Motor end cover; 301Bearing mounting base; 302Bearing; 310-Working channel; 320-First shielding ring cover; 330-Second shielding ring cover; 331-Sealing ring; 340-Bearing seat plate; 341-Lubricating oil passage; 400 - Positioning support ring seat; 410 - Mounting hole; 500 - Support component. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0027] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a large motor bearing replacement structure, including a motor housing 100, a motor body 200, a motor end cover 300, a positioning support ring seat 400, and support members 500. The motor body 200 is disposed inside the motor housing 100. Both ends of the motor housing 100 are provided with motor end covers 300. Bearing 302 mounting seats are provided on the motor end covers 300, and bearing 302 for supporting the main shaft 210 of the motor body 200 is disposed in the bearing 302 mounting seats. The positioning support ring seat 400 is fixedly disposed on the motor end cover 300 and is located inside the motor housing 100. The positioning support ring seat 400 has multiple mounting holes 410 for mounting the support members 500. When replacing the bearing 302 online, the multiple support members 500 can abut against the outer wall of the main shaft 210. The motor end cover 300 has multiple working channels 310.

[0028] Specifically, during use, the operator drives the support member 500 on the positioning support ring seat 400 through the working channel 310 on the motor end cover 300, so that multiple support members 500 abut against the main shaft 210 of the motor body 200, thereby supporting the main shaft 210. Then, the shaft located in the bearing 302 mounting seat is disassembled for maintenance. With this setting, it is not necessary to completely disassemble the motor body 200 and related components, which can greatly simplify the on-site operation procedures, effectively shorten the equipment downtime for maintenance, significantly reduce the cost of manpower and material consumption, and improve maintenance efficiency.

[0029] The mounting hole 410 is a threaded connection hole, and the support member 500 is threadedly installed in the mounting hole 410. The support member 500 can be a bolt or a support rod with external threads. The support member 500 can be inserted into the mounting hole 410 indefinitely, or it can be carried by the operator and inserted into the motor housing 100 through the working channel 310 on the motor end cover 300. Then, the support member 500 is installed in the mounting hole 410, and finally, the operator tightens the support member 500 so that the support member 500 positions and supports the main shaft 210, so that the main shaft 210 will not move when the bearing 302 is disassembled, thus avoiding collision between the rotor and the stator.

[0030] Multiple working channels 310 are evenly distributed circumferentially along the motor end cover 300, and the axis of the positioning support ring seat 400 coincides with the axis of the main shaft 210. The intersection of the axes of the multiple mounting holes 410 is located on the axis of the main shaft 210. This arrangement ensures that the multiple support members 500 can support the main shaft 210 without changing its position, thus guaranteeing the stability of the main shaft 210.

[0031] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in an optional embodiment, the motor end cover 300 is provided with a first shielding ring cover 320 for covering the working channel 310.

[0032] Specifically, a first shielding ring cover 320 is provided on the motor end cover 300. The first shielding ring cover 320 is installed on the motor end cover 300 by bolts. The first shielding ring cover 320 can cover multiple working channels 310 on the motor end cover 300. After maintenance, the staff will install the first shielding ring cover 320 on the motor end cover 300 to prevent external debris from entering the motor housing 100 through the working channels 310.

[0033] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in an optional embodiment, the motor end cover 300 is provided with a second shielding ring cover 330 for covering the bearing 302 mounting seat, and the second shielding ring cover 330 is provided with a sealing ring 331 for matching the spindle 210.

[0034] Specifically, a second shielding ring cover 330 is provided on the motor end cover 300. The second shielding ring cover 330 can cover the bearing 302 mounting seat to prevent external debris from damaging the bearing 302 mounting seat.

[0035] In addition, a sealing ring 331 is provided on the second shielding ring cover 330. The sealing ring 331 can abut against the outer wall of the main shaft 210, further protecting the bearing 302.

[0036] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in an optional embodiment, the motor end cover 300 has a detachable bearing seat plate 340, and the bearing 302 mounting seat is formed on the bearing seat plate 340; the second shielding ring cover 330 is detachably mounted on the bearing seat plate 340.

[0037] Specifically, the motor end cover 300 has a removable bearing seat plate 340, and the bearing 302 mounting seat is provided on the bearing seat plate 340. The bearing seat plate 340 is detachably mounted on the motor end cover 300 by bolts. When maintaining the bearing 302, the staff can decide whether to disassemble the bearing 302 separately or disassemble it together with the bearing seat plate 340 according to the actual situation, so as to thoroughly clean the bearing 302 mounting seat and the bearing 302.

[0038] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in an optional embodiment, the bearing housing plate 340 is provided with a lubrication oil passage 341 for lubricating the bearing 302.

[0039] Specifically, a lubrication oil passage 341 is provided on the bearing housing plate 340, through which the bearing 302 can be lubricated.

[0040] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in an optional embodiment, the spindle 210 is provided with a mounting shoulder for mounting the bearing 302, and the spindle 210 is provided with a locking ring 220 for locking the bearing 302.

[0041] Specifically, a locking ring 220 is provided on the spindle 210. The locking ring 220 is detachably locked on the spindle 210 through a threaded connector. The locking ring 220 can restrict the movement of the bearing 302.

[0042] See Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this embodiment provides a method for online replacement of bearing 302 in a large motor, which is used for online replacement of bearing structure in a large motor. The method includes the following steps: removing the first shielding ring cover 320 and the second shielding ring cover 330; tightening the support member 500 through the working channel 310 so that the multiple support members 500 abut against the main shaft 210; removing the locking ring 220; disassembling the bearing 302 separately for maintenance and installation, or disassembling the bearing seat plate 340 for overall maintenance and installation.

[0043] Specifically, when performing online replacement and maintenance on the bearing 302 of the large motor, the operator first removes the first shielding ring cover 320 and the second shielding ring cover 330, exposing the working channel 310 on the motor end cover 300 and the locking ring 220 on the main shaft 210. Then, the support member 500 located in the mounting hole 410 on the positioning support ring seat 400 is tightened, or the support member 500 is sent into the motor housing 100 through the working channel 310 and installed in the mounting hole 410. Tightening the support member 500 allows it to position and support the main shaft 210. Then, the locking ring 220 on the main shaft 210 is removed to check the condition of the bearing 302 mounting seat. If the bearing 302 mounting seat needs maintenance, the bearing seat plate 340 is removed. At this time, the bearing seat plate 340 is removed together with the bearing 302 for maintenance and replacement. If the bearing 302 mounting seat does not need maintenance, the bearing 302 can be removed separately for maintenance and replacement. After maintenance, all components are reinstalled according to the installation guide.

[0044] In addition, the online bearing replacement method 302 for large motors provided in this embodiment has the advantages of the above-mentioned online bearing replacement structure for large motors compared with the prior art, which will not be elaborated here.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A structure for online bearing replacement in a large electric motor, characterized in that, include: Motor housing (100), motor body (200), motor end cover (300), positioning support ring seat (400) and support member (500); The motor body (200) is disposed inside the motor housing (100). Both ends of the motor housing (100) are provided with motor end caps (300). A bearing (302) mounting seat is provided on the motor end cap (300). A bearing (302) for supporting the main shaft (210) of the motor body (200) is provided in the bearing (302) mounting seat. The positioning support ring seat (400) is fixedly mounted on the motor end cover (300). The positioning support ring seat (400) is located inside the motor housing (100). The positioning support ring seat (400) has multiple mounting holes (410) for mounting the support member (500). When the bearing (302) is replaced online, the multiple support members (500) can abut against the outer wall of the main shaft (210). The motor end cover (300) has multiple working channels (310).

2. The large motor online bearing replacement structure according to claim 1, characterized in that, The plurality of said working channels (310) are evenly distributed along the circumference of said motor end cover (300).

3. The large motor online bearing replacement structure according to claim 2, characterized in that, The motor end cover (300) is provided with a first shielding ring cover (320) for covering the working channel (310).

4. The large motor online bearing replacement structure according to claim 2, characterized in that, The motor end cover (300) is provided with a second shielding ring cover (330) for covering the bearing (302) mounting seat, and the second shielding ring cover (330) is provided with a sealing ring (331) for matching the main shaft (210).

5. The large motor online bearing replacement structure according to claim 1, characterized in that, The axis of the positioning support ring (400) coincides with the axis of the main shaft (210), and the intersection of the axes of the plurality of mounting holes (410) is located on the axis of the main shaft (210).

6. The large motor online bearing replacement structure according to claim 5, characterized in that, The mounting hole (410) is a threaded connection hole, and the support (500) is threadedly installed in the mounting hole (410).

7. The large motor online bearing replacement structure according to claim 4, characterized in that, The motor end cover (300) has a removable bearing seat plate (340), and the bearing (302) mounting seat is provided on the bearing seat plate (340); The second shielding ring cover (330) is detachably mounted on the bearing seat plate (340).

8. The large motor online bearing replacement structure according to claim 7, characterized in that, The bearing seat plate (340) is provided with a lubrication oil passage (341) for lubricating the bearing (302).

9. The large motor online bearing replacement structure according to claim 1, characterized in that, The spindle (210) is provided with a mounting shoulder for mounting the bearing (302), and the spindle (210) is provided with a locking ring (220) for locking the bearing (302).

10. A method for online bearing replacement (302) of a large motor, used in the online bearing replacement structure of a large motor as described in any one of claims 1-9, characterized in that, Includes the following steps: Remove the first shielding ring cover (320) and the second shielding ring cover (330); Tighten the support member (500) through the working channel (310) so that the multiple support members (500) abut against the spindle (210); Remove the locking ring (220); The bearing (302) can be disassembled separately for maintenance and installation, or the bearing housing plate (340) can be disassembled for overall maintenance and installation.

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