Electric motor with protection against bearing electric erosion

Abstract

This utility model provides a motor for preventing bearing electrolytic corrosion, belonging to the field of motor technology. It includes a grounded motor housing, a rotatable shaft inside the housing, a front cover and a rear cover at both ends of the housing, each containing a bearing. The shaft passes through two sets of bearings at both ends. An isolation cover is provided on one side of the rear cover corresponding to the shaft, and a conductive component is located within the isolation cover. The conductive component includes a rotatable conductive roller, a wear-resistant conductive sleeve at one end of the shaft, and one side of the conductive roller making rolling contact with the wear-resistant conductive sleeve. The bottom of the conductive roller is grounded to the rear cover via an elastic wire. The rolling contact between the conductive roller and the wear-resistant conductive sleeve replaces the sliding friction of the carbon brush, avoiding mechanical wear during long-term operation. The conductive roller makes movable contact with the wear-resistant conductive sleeve via a spring, maintaining good contact between them. An insulating sleeve fitted on the bearing blocks the current on the shaft, keeping the bearing electrically isolated.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and more specifically, it relates to a motor that prevents bearing electrolytic corrosion. Background Technology

[0002] As a device that converts electrical energy into mechanical energy, electric motors are widely used in industrial automation, home appliances and other fields. However, when the motor is running, the parasitic capacitance between the stator and the rotor will generate shaft voltage. If the shaft voltage exceeds the breakdown voltage of the bearing grease, shaft current will be formed, which will cause pitting, groove and other damage to the bearing raceway and rolling element surface, which will lead to abnormal noise and increased vibration of the motor, affecting the reliability of the motor.

[0003] For example, Chinese invention patent CN201810701885.6 provides a motor that effectively prevents shaft current from burning the bearing. This motor uses a combination of a shaft, brush holder, carbon brush, and spring. During use, one end of the spring is installed in the brush holder, and the other end of the spring is connected to the carbon brush. One end of the carbon brush contacts the shaft, and the brush holder is grounded to conduct the current on the shaft to the bearing, thus extending the motor's lifespan. However, traditional methods of protecting motor bearings from electrical erosion mainly rely on the carbon brush contacting the motor shaft to guide the current on the shaft to the grounded motor housing. The contact between the carbon brush and the bearing is a mechanical friction, which can lead to carbon brush wear and increased contact resistance over time, affecting the grounding effect. Furthermore, after long-term use, the motor needs to be disassembled and the carbon brush replaced, resulting in a lack of reliability. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a motor for preventing bearing electrolytic corrosion. This addresses the issue that in the prior art, traditional methods for protecting motor bearings from electrolytic corrosion primarily rely on carbon brushes contacting the motor shaft. However, the contact between the carbon brush and the bearing involves mechanical friction, which leads to carbon brush wear over time, increasing contact resistance and affecting grounding. Furthermore, the motor needs to be disassembled and the carbon brushes replaced after prolonged use, resulting in a lack of reliability.

[0005] The purpose and effect of this utility model for preventing bearing electrolytic corrosion of an electric motor are achieved by the following specific technical means:

[0006] An electric motor for preventing bearing electrolytic corrosion includes a grounded motor housing, a rotatable shaft disposed inside the motor housing, a front cover and a rear cover respectively disposed at both ends of the motor housing, bearings disposed inside both the front cover and the rear cover, and the two ends of the shaft respectively passing through two sets of the bearings, and an isolation cover disposed on one side of the rear cover corresponding to the shaft, and a conductive component disposed inside the isolation cover;

[0007] The conductive component includes a rotatable conductive roller, one end of the rotating shaft is provided with a wear-resistant conductive sleeve, one side of the conductive roller is in rolling contact with the wear-resistant conductive sleeve, and the bottom of the conductive roller is grounded to the rear cover through an elastic wire.

[0008] According to a preferred embodiment, the conductive component further includes a conductive element, a conductive column is inserted inside the conductive roller, both ends of the conductive column are rotatably connected to a rotating seat, a first mounting groove is provided on the top of the rotating seat, the conductive element is disposed in the first mounting groove, and two sets of connecting sleeves are provided on the top of the conductive element, the two sets of connecting sleeves are respectively sleeved on both ends of the conductive column.

[0009] According to a preferred embodiment, a mounting base is provided inside the isolation cover, and the top of the mounting base is connected to the rotating base through two sets of telescopic rods, each set of telescopic rods containing a spring.

[0010] According to a preferred embodiment, the top of the mounting base is provided with a guide hole, the bottom of the first mounting groove is provided with a through hole, and the bottom of the conductive component is provided with a guide post, which is slidably inserted through the through hole into the guide hole.

[0011] According to a preferred embodiment, a grounded connector is provided inside the rear cover, and the bottom end of the guide post is connected to the connector via the elastic wire;

[0012] The conductive roller has a conductive coating on its periphery.

[0013] According to a preferred embodiment, a second mounting groove is provided on the side of the front cover adjacent to the isolation cover. The two sets of bearings are respectively located in the two sets of second mounting grooves. Insulating sleeves are provided on the periphery of the two sets of bearings. Fixing seats are provided on both sides of the two sets of insulating sleeves. Two sets of slots are provided on the inner walls of the two sides of the second mounting grooves, corresponding to the two sets of fixing seats. The two sets of fixing seats are respectively locked in the two sets of slots.

[0014] According to a preferred embodiment, a sealing kit is provided at the opening of the second mounting slot, and two sets of fixing pins are provided on one side of the sealing kit. Two sets of through holes are correspondingly opened on the two sets of slots and the two sets of fixing seats, and the two sets of fixing pins are respectively inserted into the two sets of through holes on the two sets of slots and the two sets of fixing seats.

[0015] The enclosure is secured to the front cover or the isolation shield by multiple sets of screws.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By setting a wear-resistant conductive sleeve at one end of the shaft, the conductive roller and the wear-resistant conductive sleeve form a rolling contact, replacing the sliding friction of the traditional carbon brush and avoiding mechanical wear during long-term operation. The conductive roller is rotatably mounted on the rotating seat and connected to the grounding terminal of the rear cover through conductive posts, conductive parts and elastic wires to form a low-impedance grounding path. This rolling contact method makes the contact resistance of the conductive components stable and will not increase due to wear. Unlike traditional carbon brushes, there is no need to disassemble the motor for replacement periodically. This solves the problem of reduced grounding effect caused by carbon brush wear, ensures that the grounding reliability of the motor is not affected during long-term operation, and reduces downtime caused by maintenance.

[0018] 2. By setting an insulating sleeve on the bearing periphery, an electrical isolation structure is formed for the bearing, which can block the current on the shaft, prevent the current on the bearing from breaking down the bearing grease and causing electrolytic corrosion, and protect the bearing raceway and rolling elements from pitting, groove and other damage; by setting a fixed seat and a slot, the insulating sleeve is installed firmly on one side of the sealing kit by a fixing pin, and the sealing kit is fixed by screws to further ensure the stability of the insulating sleeve position, so that the bearing is always in an electrically isolated state, improving the reliability of motor operation.

[0019] 3. Through the installation of telescopic rods and springs, the mounting base is connected to the rotating seat via the telescopic rods and springs, allowing the conductive roller to adaptively conform to the wear-resistant conductive sleeve. Even if there is slight radial runout of the rotating shaft, the elastic compensation of the telescopic rods can maintain good contact between the conductive roller and the wear-resistant conductive sleeve, ensuring the continuity of the grounding path. The conductive coating on the periphery of the conductive roller enhances conductivity and reduces contact resistance. The guide posts and guide holes provide guidance for the movement of the conductive roller, avoiding the problem of frequent adjustments required due to poor contact in traditional carbon brush grounding structures. At the same time, the elastic support structure reduces the impact of motor vibration on conductive contact, further improving the reliability of grounding. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is an exploded view of the present invention;

[0022] Figure 3 This is a schematic diagram of the assembled structure of the conductive component of this utility model;

[0023] Figure 4 This is a schematic diagram of the disassembled conductive component of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the insulating sleeve and the sealing kit after assembly of this utility model;

[0025] Figure 6 for Figure 5 A schematic diagram of the disassembled structure.

[0026] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0027] 11. Motor housing; 12. Shaft; 13. Front cover; 14. Rear cover; 15. Bearing; 16. Isolation cover; 21. Conductive roller; 22. Wear-resistant conductive sleeve; 23. Elastic wire; 24. Conductive component; 25. Conductive post; 26. Rotating seat; 27. First mounting slot; 28. Connecting sleeve; 29. ​​Mounting seat; 30. Telescopic rod; 31. Spring; 32. Guide hole; 33. Guide post; 34. Connecting seat; 41. Second mounting slot; 42. Insulating sleeve; 43. Fixing seat; 44. Slot; 45. Enclosure kit; 46. Fixing pin. Detailed Implementation

[0028] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0029] Example:

[0030] As attached Figure 1 To be continued Figure 7 As shown:

[0031] This utility model provides a motor for preventing bearing electrolytic corrosion, including a motor housing 11, which supports and protects internal components and is grounded. A rotatable shaft 12 is installed inside the motor housing 11. A front cover 13 and a rear cover 14 are respectively installed at both ends of the motor housing 11. Bearings 15 are installed inside both the front and rear covers 13 and 14. The two ends of the shaft 12 are respectively inserted into the two sets of bearings 15, allowing the shaft 12 to rotate within the motor housing 11. An isolation cover 16 is provided on one side of the rear cover 14 corresponding to the shaft 12, and a conductive component is installed inside the isolation cover 16. The conductive component includes a rotatable conductive roller 21. A wear-resistant conductive sleeve 22 is provided at one end of the shaft 12. One side of the conductive roller 21 rolls in contact with the wear-resistant conductive sleeve 22. The bottom of the conductive roller 21 is grounded to the rear cover 14 through an elastic wire 23.

[0032] Specifically, in traditional motors, the sliding friction between the carbon brush and the shaft end easily causes carbon brush wear. However, this new type of motor uses a rolling contact form between the conductive roller 21 and the wear-resistant conductive sleeve 22, which results in less friction between the two and no significant wear even after long-term operation. This allows the contact resistance to remain stable, eliminating the need to periodically disassemble the motor to replace the carbon brush. This solves the problem of increased contact resistance caused by carbon brush wear in traditional motors, which affects the grounding effect. It ensures that the grounding reliability of the motor is not affected during long-term operation and reduces motor downtime due to maintenance.

[0033] Please refer to, for example Figure 3 , Figure 4 and Figure 5 As shown, the conductive assembly also includes a conductive element 24. A conductive post 25 is inserted inside the conductive roller 21. Both ends of the conductive post 25 are rotatably connected to the rotating seat 26. The top of the rotating seat 26 has a first mounting groove 27. The conductive element 24 is installed in the first mounting groove 27. Two sets of connecting sleeves 28 are provided on the top of the conductive element 24. The two sets of connecting sleeves 28 are respectively fitted onto the two ends of the conductive post 25 to realize the electrical connection between the conductive post 25 and the conductive element 24. The top of the mounting seat 29 has a guide hole 32. The bottom of the first mounting groove 27 has a through hole. The bottom of the conductive element 24 has a guide post 33. The guide post 33 is slidably inserted through the through hole and is inserted into the guide hole 32 to provide guidance for the movement of the conductive element 24. The rear cover 14 has a grounded connecting seat 34. The bottom end of the guide post 33 is connected to the connecting seat 34 through an elastic wire 23, thereby connecting the conductive element 24 with the grounded end of the rear cover 14.

[0034] Specifically, the conductive roller 21 is connected to the rotating seat 26 via the conductive post 25, allowing it to rotate on the rotating seat 26. The conductive post 25 is connected to the conductive component 24 via the connecting sleeve 28. The conductive component 24 is then connected to the connecting seat 34 of the rear cover 14 via the guide post 33 and the elastic wire 23, forming a path from the conductive roller 21 to the grounding end of the rear cover 14, enabling the current on the rotating shaft 12 to be conducted to the ground. The guide post 33 and the guide hole 32 ensure that the conductive component 24 will not shift during movement, thus making the position of the conductive roller 21 relatively stable and avoiding the need for frequent adjustments due to poor contact, as is the case with traditional carbon brushes. In addition, the elastic wire 23 has a certain degree of elasticity, which can adapt to the movement of the conductive component 24, further improving the reliability of grounding.

[0035] Please refer to, for example Figure 4 and Figure 6 As shown, a mounting base 29 is provided inside the isolation cover 16. The top of the mounting base 29 is connected to the rotating base 26 through two sets of telescopic rods 30, so that the rotating base 26 can move up and down relative to the mounting base 29. A spring 31 is provided inside each set of telescopic rods 30. A conductive coating is provided around the conductive roller 21 to enhance the conductivity of the conductive roller 21.

[0036] Specifically, since the telescopic rod 30 contains a spring 31, an elastic connection is formed between the mounting base 29 and the rotating base 26. When the rotating shaft 12 experiences slight radial runout, the rotating base 26 can move up and down under the action of the telescopic rod 30 and the spring 31, thereby allowing the conductive roller 21 to adaptively fit the wear-resistant conductive sleeve 22, always maintaining a good contact state and ensuring the continuity of the grounding path. The conductive coating on the periphery of the conductive roller 21 can improve its conductivity and reduce the contact resistance between it and the wear-resistant conductive sleeve 22, allowing the current on the rotating shaft 12 to flow more smoothly.

[0037] Please refer to, for example Figure 6 and Figure 7 As shown, the front cover 13 and the isolation cover 16 are each provided with a second mounting groove 41 on the side adjacent to each other. The two sets of bearings 15 are respectively located in the two sets of second mounting grooves 41. The two sets of bearings 15 are provided with insulating sleeves 42 on their periphery. The two sets of insulating sleeves 42 are provided with fixing seats 43 on both sides. The inner walls on both sides of the second mounting groove 41 are provided with two sets of slots 44 corresponding to the two sets of fixing seats 43. The two sets of fixing seats 43 are respectively locked in the two sets of slots 44.

[0038] Specifically, the insulating sleeve 42 is fitted around the bearing 15 to form an electrical isolation structure, which can prevent the current on the shaft 12 from passing through the bearing 15. This avoids the current from breaking down the grease inside the bearing 15, thereby protecting the raceway and rolling elements of the bearing 15 from pitting, groove and other electrical erosion damage, and extending the service life of the bearing 15.

[0039] Please refer to, for example Figure 7 As shown, a sealing kit 45 is installed at the opening of the second mounting slot 41. There are two sets of fixing pins 46 on one side of the sealing kit 45. Corresponding through holes are provided on the slot 44 and the fixing seat 43. The fixing pins 46 pass through these through holes to fix the fixing seat 43 in the slot 44. At the same time, the sealing kit 45 is fixedly connected to the front cover 13 or the isolation cover 16 by multiple sets of screws, thereby closing the opening of the second mounting slot 41.

[0040] Specifically, the fixing pin 46 on one side of the enclosed kit 45 passes through the through hole on the slot 44 and the fixing seat 43, and the fixing seat 43 is firmly installed in the slot 44. Then, the enclosed kit 45 is fixed to the front cover 13 or the isolation cover 16 by screws. This further ensures that the insulating sleeve 42 is in a stable position in the second mounting groove 41, so that the bearing 15 is always in an electrically isolated state, preventing the shaft current from causing electrolytic corrosion to the bearing 15, and further improving the reliability of the motor operation.

[0041] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A motor for preventing bearing electrolytic corrosion, characterized in that: The device includes a grounded motor housing (11), a rotatable shaft (12) is provided inside the motor housing (11), a front cover (13) and a rear cover (14) are provided at both ends of the motor housing (11), bearings (15) are provided inside the front cover (13) and the rear cover (14), and the two ends of the shaft (12) are respectively inserted into the two sets of bearings (15). An isolation cover (16) is provided on one side of the rear cover (14) corresponding to the shaft (12), and a conductive component is provided inside the isolation cover (16). The conductive component includes a rotatable conductive roller (21), and a wear-resistant conductive sleeve (22) is provided at one end of the rotating shaft (12). One side of the conductive roller (21) is in rolling contact with the wear-resistant conductive sleeve (22), and the bottom of the conductive roller (21) is grounded to the rear cover (14) through an elastic wire (23).

2. The motor for preventing bearing electrolytic corrosion according to claim 1, characterized in that: The conductive component also includes a conductive element (24). A conductive column (25) is inserted inside the conductive roller (21). Both ends of the conductive column (25) are rotatably connected to the rotating seat (26). The rotating seat (26) has a first mounting groove (27) on its top. The conductive element (24) is disposed in the first mounting groove (27). Two sets of connecting sleeves (28) are disposed on the top of the conductive element (24). The two sets of connecting sleeves (28) are respectively fitted onto both ends of the conductive column (25).

3. The motor for preventing bearing electrolytic corrosion according to claim 2, characterized in that: The isolation cover (16) is provided with a mounting base (29). The top of the mounting base (29) is connected to the rotating seat (26) by two sets of telescopic rods (30). Each set of telescopic rods (30) is provided with a spring (31).

4. A motor for preventing bearing electrolytic corrosion according to claim 3, characterized in that: The mounting base (29) has a guide hole (32) at the top, the first mounting groove (27) has a through hole at the bottom, and the conductive component (24) has a guide post (33) at the bottom. The guide post (33) passes through the through hole and is slidably inserted into the guide hole (32).

5. A motor for preventing bearing electrolytic corrosion according to claim 4, characterized in that: The rear cover (14) is provided with a grounded connector (34), and the bottom end of the guide post (33) is connected to the connector (34) through the elastic wire (23); The conductive roller (21) has a conductive coating on its periphery.

6. A motor for preventing bearing electrolytic corrosion according to claim 1, characterized in that: The front cover (13) and the isolation cover (16) are each provided with a second mounting groove (41). The two sets of bearings (15) are respectively located in the two sets of second mounting grooves (41). The two sets of bearings (15) are provided with insulating sleeves (42) around their periphery. The two sets of insulating sleeves (42) are provided with fixing seats (43) on both sides. The inner walls on both sides of the second mounting groove (41) are respectively provided with two sets of slots (44) corresponding to the two sets of fixing seats (43). The two sets of fixing seats (43) are respectively locked in the two sets of slots (44).

7. A motor for preventing bearing electrolytic corrosion according to claim 6, characterized in that: The second mounting slot (41) is provided with a sealing kit (45) at its opening. Two sets of fixing pins (46) are provided on one side of the sealing kit (45). Two sets of through holes are provided on both sets of slots (44) and both sets of fixing seats (43). The two sets of fixing pins (46) are respectively inserted into the two sets of through holes on the two sets of slots (44) and the two sets of fixing seats (43). The enclosure (45) is fixedly connected to the front cover (13) or the isolation cover (16) by a plurality of sets of screws.

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