Grounding device for a shaft end of an electric machine shaft

Abstract

The application relates to the field of electric power grounding, in particular to a grounding device for the shaft end of a motor shaft, which comprises oppositely arranged first and second conductive seats, the first conductive seat is used for being connected with the shaft end of the motor shaft, the second conductive seat is used for being connected with an insulating frame on a vehicle body, a plurality of containing frames are fixedly installed on the side of the second conductive seat close to the first conductive seat, a conductive block is slidably arranged in the containing frame, an elastic piece is installed in the containing frame, the elastic piece is used for driving the conductive block to tightly abut against the first conductive seat, a conductive wire is connected between the conductive block and the second conductive seat, and the second conductive seat is electrically connected with a grounding system of the vehicle body. The application has the effect of improving the safety of motor operation.

Description

Technical Field

[0001] This application relates to the field of electrical grounding, and in particular to a grounding device for the shaft end of a motor shaft. Background Technology

[0002] In industries such as wind turbine generators, high-speed rail, and trains, motors are one of the core components, and the stable operation of motors is crucial to ensuring the safety and efficiency of the equipment.

[0003] In existing technologies, to ensure equipment safety and efficiency, measures are typically taken from the design and maintenance perspectives of the motor itself. On one hand, during motor manufacturing, the materials for the motor shaft and bearings are optimized to improve their wear resistance and corrosion resistance, thereby extending the service life of the components. On the other hand, daily maintenance and inspection of the motor are strengthened, and worn parts are replaced regularly to ensure the normal operation of the motor. Simultaneously, monitoring methods are employed to monitor the motor's operating status in real time, enabling the timely detection and handling of potential problems.

[0004] However, when a potential difference exists between the motor shaft and the bearing, current may form a circuit through the bearing, resulting in electrolytic corrosion or discharge. This electrolytic corrosion or discharge phenomenon accelerates bearing wear and may even lead to bearing damage, seriously affecting the safety of motor operation. Summary of the Invention

[0005] To improve the safety of motor operation, this application provides a grounding device for the shaft end of a motor.

[0006] This application provides a grounding device for the shaft end of a motor, which adopts the following technical solution:

[0007] A grounding device for the end of a motor shaft includes a first conductive seat and a second conductive seat arranged opposite to each other. The first conductive seat is used to connect to the end of the motor shaft, and the second conductive seat is used to connect to an insulating frame on a vehicle body. A plurality of receiving frames are fixedly installed on the side of the second conductive seat near the first conductive seat. A conductive block is slidably inserted inside the receiving frame. An elastic element is installed inside the receiving frame. The elastic element is used to drive the conductive block to press tightly against the first conductive seat. A conductive wire is connected between the conductive block and the second conductive seat. The second conductive seat is electrically connected to the grounding system of the vehicle body.

[0008] By adopting the above technical solution, the first conductive seat is connected to the end of the motor shaft, and the second conductive seat is connected to the vehicle body insulation frame. The conductive block is driven by an elastic element to press tightly against the first conductive seat. The conductive block is connected to the second conductive seat through a conductive wire. The second conductive seat is electrically connected to the vehicle body grounding system. This can divert current, reduce the occurrence of electro-erosion or discharge phenomena caused by potential difference between the motor shaft and the bearing, and improve the safety of motor operation.

[0009] Optionally, the conductive block inside one of the receiving frames can freely extend and retract, while the other receiving frames are provided with a first locking rod. The receiving frames have a first opening through which the first locking rod slides, and the conductive blocks have a limiting groove through which the first locking rod passes.

[0010] By adopting the above technical solution, the first locking rod, in conjunction with the limiting groove, can limit the corresponding conductive block, and the extension and retraction state of the conductive blocks in different accommodating frames can be controlled as needed.

[0011] Optionally, the plurality of receiving frames are arranged in a ring, and a connecting block is fixedly installed between two adjacent receiving frames. The connecting block has a first receiving groove for the first locking rod to slide through. The connecting block is equipped with a driving component, which is used to drive the first locking rod to be pulled out from the limiting groove.

[0012] By adopting the above technical solution, the driving component can drive the first locking rod to be pulled out of the limiting groove of the conductive block, which facilitates the adjustment of the extension and retraction state of the conductive block as needed, thereby enhancing the adjustability of the grounding device.

[0013] Optionally, the driving assembly includes a second locking rod, a first guide block, and a second guide block. The connecting block has a second receiving groove for the second locking rod to slide through. The first receiving groove and the second receiving groove are interconnected. The receiving frame has a second opening for the second locking rod to slide through. The first guide block is fixedly installed at the end of the first locking rod near the conductive block. The side of the first guide block near the second conductive seat is inclined. The second guide block is fixedly installed at the end of the second locking rod away from the conductive block. One side of the second guide block is inclined so that the first locking rod can abut against it. Multiple first locking rods are pulled out sequentially. The second locking rod is inserted into the second opening of the receiving frame upstream of the first locking rod in the pulling-out sequence.

[0014] By adopting the above technical solution, and using the inclined surfaces of the first guide block and the second guide block to drive the sequential pulling out of multiple first locking rods, it is convenient to orderly control and adjust the extension and retraction state of the conductive block.

[0015] Optionally, a third guide block is fixedly installed at the end of the second locking rod away from the second guide block. The third guide block is inclined on the side away from the second conductive seat, and a ball bearing is interference-fitted on the side of the third guide block away from the second locking rod.

[0016] By adopting the above technical solution, when the conductive block is inserted into the receiving frame, the conductive block presses against the third guide block, which causes the second locking rod to retract into the second receiving groove, facilitating the placement of the conductive block inside the receiving frame. When the conductive block is placed inside the receiving frame, the third guide block drives the ball bearings to abut against the conductive block, reducing wear.

[0017] Optionally, the elastic element is a coil spring, a first mounting plate is fixedly installed on the inner wall of the receiving frame, a second mounting plate is fixedly installed on the side of the first mounting plate near the second conductive seat, the second mounting plate is bent to accommodate the bent portion of the elastic element, and the free end of the elastic element is fixedly connected to the first mounting plate.

[0018] By adopting the above technical solution, the elastic element is set as a coil spring, and with the first mounting plate and the second mounting plate which is bent to accommodate the bent part of the coil spring, the coil spring can be installed stably.

[0019] Optionally, the first mounting plate has a third port aligned with the first port, and the first mounting plate has a fourth port aligned with the second port.

[0020] By adopting the above technical solution, the third port is used to avoid the first limiting rod. The first mounting plate has a fourth port aligned with the second port, allowing the third guide block to pass through smoothly. The third guide block will press tightly against the coil spring, thereby facilitating the application of force to the conductive block against the first conductive seat.

[0021] Optionally, the conductive block has multiple heat dissipation grooves on its periphery.

[0022] By adopting the above technical solution, the heat dissipation area of ​​the conductive block can be increased, thereby improving the heat dissipation effect.

[0023] Optionally, a plurality of reinforcing blocks are fixedly installed on the inner wall of the receiving frame, and the reinforcing blocks are slidably disposed inside the heat dissipation groove.

[0024] By adopting the above technical solution, the reinforcing block can support the conductive block.

[0025] Optionally, the reinforcing block is triangular, with its tip inserted into the heat dissipation groove, and a space is left between the tip of the reinforcing block and the bottom of the heat dissipation groove.

[0026] By adopting the above technical solution, the tip of the triangular reinforcing block is inserted into the heat dissipation groove and a space is left at the bottom of the groove, which can further enhance the structural stability and facilitate the air circulation in the heat dissipation groove.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] The first conductive seat is connected to the end of the motor shaft, and the second conductive seat is electrically connected to the vehicle grounding system. The elastic element drives the conductive block to press tightly against the first conductive seat, which can divert current and prevent electrolytic corrosion, thereby ensuring the safety of motor operation and improving the safety and reliability of high-speed rail and train operation.

[0029] After one conductive block wears out, pull out the first locking rod on the other conductive block, so that the other conductive block is pressed tightly against the first conductive seat. Replace the conductive blocks only after each conductive block has worn out, thereby extending the replacement cycle of the conductive blocks. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0031] Figure 2 This is an exploded view of the second conductive base, conductive block, and receiving frame of Embodiment 1 of this application;

[0032] Figure 3 This is a schematic diagram of the structure of the second conductive base in Embodiment 1 of this application;

[0033] Figure 4 yes Figure 3 Sectional view at AA;

[0034] Figure 5 This is a schematic diagram of the overall structure of Embodiment 2 of this application;

[0035] Figure 6 This is a schematic diagram of the structure of the second conductive base in Embodiment 2 of this application;

[0036] Figure 7 yes Figure 6 Enlarged view at point A;

[0037] Figure 8 This is an exploded view of the second conductive base, conductive block, and receiving frame of Embodiment 2 of this application;

[0038] Figure 9 This is a schematic diagram of the conductive block, connecting block, and elastic element in Embodiment 2 of this application;

[0039] Figure 10 This is an exploded view of the conductive block, connecting block, and elastic element of Embodiment 2 of this application;

[0040] Figure 11 This is an exploded view of the connecting block, the first limiting rod, and the second limiting rod of Embodiment 2 of this application;

[0041] Figure 12 This is a schematic diagram of the structure of the receiving frame in Embodiment 2 of this application;

[0042] Figure 13 This is a schematic diagram of the structure of the second conductive base in Embodiment 3 of this application;

[0043] Figure 14 This is a schematic diagram of the structure after a conductive block is removed from the second conductive seat in Embodiment 3 of this application.

[0044] Explanation of reference numerals in the attached drawings: 1. First conductive seat; 2. Second conductive seat; 3. Receiving frame; 4. Conductive block; 5. Elastic element; 6. First mounting plate; 7. Second mounting plate; 8. Conductive wire; 9. First locking rod; 10. First opening; 11. Second opening; 12. Third opening; 13. Fourth opening; 14. Limiting groove; 15. Connecting block; 16. First receiving groove; 17. Second receiving groove; 18. Drive assembly; 181. Second locking rod; 182. First guide block; 183. Second guide block; 19. Third guide block; 20. Ball bearing; 21. Heat dissipation groove; 22. Reinforcing block. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-14 This application will be described in further detail. Example 1

[0046] This application discloses a grounding device for the shaft end of a motor shaft.

[0047] Reference Figure 1 , Figure 2 A grounding device for the end of a motor shaft includes a first conductive seat 1 and a second conductive seat 2 disposed opposite to each other. The first conductive seat 1 is used to connect to the end of the motor shaft by bolts. An insulating frame is pre-installed on the vehicle body, and the second conductive seat 2 is fixedly installed on the insulating frame by bolts, and the second conductive seat 2 is connected to the grounding system of the vehicle body.

[0048] Reference Figure 3 , Figure 4 A plurality of receiving frames 3 are fixedly installed on the side of the second conductive base 2 near the first conductive base 1, and conductive blocks 4 are slidably inserted inside the receiving frames 3. An elastic element 5 is installed inside the receiving frame 3. The elastic element 5 is a spring or coil spring, etc. In the embodiment of this application, the elastic element 5 is a coil spring.

[0049] Reference Figure 3 , Figure 4 A first mounting plate 6 is fixedly installed on the inner wall of the receiving frame 3, and a second mounting plate 7 is fixedly installed on the side of the first mounting plate 6 near the second conductive seat 2. The second mounting plate 7 is bent to accommodate the bent portion of the elastic member 5, and the free end of the elastic member 5 is fixedly connected to the first mounting plate 6. A conductive wire 8 connects the conductive block 4 and the second conductive seat 2.

[0050] The bent portion of the elastic element 5 presses tightly against the side of the conductive block 4 near the second conductive seat 2, thereby making the conductive block 4 press tightly against the first conductive seat 1. Then, the motor shaft end conducts current into the first conductive seat 1, and the first conductive seat 1 conducts current into the grounding system through the conductive block 4, the conductive wire 8, and the second conductive seat 2, thereby improving the safety of motor operation.

[0051] The implementation principle of the grounding device for the shaft end of a motor shaft in this embodiment is as follows: the elastic element 5 drives the conductive block 4 to press tightly against the first conductive seat 1, thereby facilitating the discharge of current from the shaft end of the motor shaft. Simultaneously, the motor drives the first conductive seat 1 to rotate, causing wear between the first conductive seat 1 and the conductive block 4. The elastic element 5 drives the conductive block 4 to press tightly against the first conductive seat 1, thereby ensuring that the conductive block 4 remains firmly against the first conductive seat 1. Example 2

[0052] This application discloses a grounding device for the shaft end of a motor shaft.

[0053] Reference Figure 5 , Figure 6 , Figure 7 The difference between the grounding device for the shaft end of a motor shaft in this embodiment and that in embodiment 1 is that the conductive block 4 inside a receiving frame 3 can freely extend and retract, while the other receiving frames 3 are provided with a first locking rod 9.

[0054] Reference Figure 8 , Figure 9 , Figure 10 The receiving frame 3 has a first opening 10 for the first locking rod 9 to slide through, and the conductive block 4 has a limiting groove 14 for the first locking rod 9 to pass through.

[0055] Initially, the conductive block 4 without the first locking lever 9 is pressed against the first conductive seat 1 to conduct electricity. After the conductive block 4 wears out, the first locking lever 9 on another conductive block 4 is pulled out, thus allowing the other conductive block 4 to press against the first conductive seat 1. By controlling multiple conductive blocks 4 to press against the first conductive seat 1 in sequence, the service life of the grounding device at the end of the motor shaft is extended. After each conductive block 4 has worn out, they are replaced uniformly, thereby reducing the frequency of replacing the conductive blocks 4.

[0056] Reference Figure 10 , Figure 11 The plurality of receiving frames 3 are arranged in a ring, and a connecting block 15 is fixedly installed between two adjacent receiving frames 3. The connecting block 15 has a first receiving groove 16 for the first locking rod 9 to slide through, and a driving assembly 18 is installed on the connecting block 15. The driving assembly 18 includes a second locking rod 181, a first guide block 182, and a second guide block 183.

[0057] Reference Figure 8 , Figure 11 , Figure 12The connecting block 15 has a second receiving groove 17 for the second locking rod 181 to slide through, and the first receiving groove 16 and the second receiving groove 17 are interconnected. The receiving frame 3 has a second opening 11 for the second locking rod 181 to slide through, the first mounting plate 6 has a third opening 12 aligned with the first opening 10, and the first mounting plate 6 also has a fourth opening 13 aligned with the second opening 11.

[0058] The first guide block 182 is fixedly installed at the end of the first locking rod 9 near the conductive block 4, and the side of the first guide block 182 near the second conductive seat 2 is inclined. The second guide block 183 is fixedly installed at the end of the second locking rod 181 away from the conductive block 4, and the side of the second guide block 183 is inclined so that the first locking rod 9 can abut against it. Multiple first locking rods 9 are pulled out in sequence, and the second locking rod 181 is inserted into the second opening 11 of the receiving frame 3 upstream of the first locking rod 9 in the pulling sequence.

[0059] As the conductive block 4 is inserted into the receiving frame 3, the conductive block 4 causes the elastic element 5 to unfold, and the elastic element 5 will block the fourth opening 13, thereby restricting the second locking rod 181 from extending out of the second receiving groove 17.

[0060] Initially, the conductive block 4 without the first locking rod 9 will first press against the first conductive seat 1 to conduct electricity. As the conductive block 4 gradually wears down, the elastic element 5 gradually retracts, thereby opening the fourth passage 13. After the fourth passage 13 opens, the elastic element 5 drives the next extended conductive block 4 to press against the first conductive seat 1. When the next conductive block 4 presses against the first conductive seat 1, the inner wall of the limiting groove 14 of the conductive block 4 presses against the inclined side of the first guide block 182, thereby causing the first locking rod 9 to retract into the first receiving groove 16. When the first locking rod 9 retracts into the first receiving groove 16, the first locking rod 9 presses against the inclined side of the second guide block 183, thereby causing the second locking rod 181 to pass through the third through hole.

[0061] After each conductive block 4 wears down to the point where the elastic element 5 opens the second port 11, the next conductive block 4 is repeatedly pressed against the first conductive seat 1, thereby realizing that each conductive block 4 automatically presses against the first conductive seat 1 in sequence, reducing manual operation.

[0062] As the conductive block 4 gradually wears down, the elastic element 5 causes the conductive block 4 to gradually extend out of the receiving frame 3, and the elastic element 5 gradually retracts, thereby reducing the elastic force of the elastic element 5 on the conductive block 4. When the bent portion of the elastic element 5 blocks the second opening 11, the second locking rod 181 applies a pushing force to the bent portion of the elastic element 5, thereby increasing the clamping force of the conductive block 4 on the first conductive seat 1 to compensate for the reduction in the elastic force of the elastic element 5 on the conductive block 4.

[0063] Reference Figure 11A third guide block 19 is fixedly installed at the end of the second locking rod 181 away from the second guide block 183. The third guide block 19 is inclined on the side away from the second conductive seat 2. A ball bearing 20 is interference-fitted on the side of the third guide block 19 away from the second locking rod 181.

[0064] The second locking rod 181 presses against the elastic element 5 via the ball bearing 20, thereby reducing the wear of the elastic element 5 and extending its service life.

[0065] When each conductive block 4 is worn out and needs to be replaced, the second conductive seat 2 is removed from the vehicle body. Then, the conductive block 4 is removed from the receiving frame 3, and a new conductive block 4 is replaced and reconnected to the conductive wire 8. According to the order in which the conductive blocks 4 extend and press against the first conductive seat 1, the last extended conductive block 4 is inserted into the receiving frame 3 first, and then the next conductive block 4 is inserted into the receiving frame 3.

[0066] When the next conductive block 4 is inserted into the receiving frame 3, the conductive block 4 causes the elastic element 5 to unfold. During the unfolding process, the elastic element 5 presses against the inclined side of the third guide block 19, thereby causing the second locking rod 181 to retract into the second receiving groove 17. When the second locking rod 181 retracts into the second receiving groove 17, the second locking rod 181, through the second guide block 183, causes the first locking rod 9 to extend and insert into the limiting groove 14 on the conductive block 4 that was previously placed inside the receiving frame 3. In this way, each conductive block 4 is inserted into the receiving frame 3 in sequence, thereby facilitating the replacement of the conductive block 4.

[0067] The implementation principle of the grounding device for the shaft end of a motor shaft in this application embodiment is as follows: the drive component 18 automatically controls the conductive block 4 to press against the first conductive seat 1 in sequence to conduct electricity, thereby extending the service life of the grounding device for the shaft end of the motor shaft, reducing the frequency of replacing the conductive block 4, and reducing the workload of the staff. Example 3

[0068] This application discloses a grounding device for the shaft end of a motor shaft.

[0069] Reference Figure 13 , Figure 14 The difference between the grounding device for the shaft end of a motor shaft in this embodiment and that in embodiment 1 is that the conductive block 4 has multiple heat dissipation grooves 21 on its periphery, and multiple reinforcing blocks 22 are fixedly installed on the inner wall of the receiving frame 3. The reinforcing blocks 22 are triangular, and the tips of the reinforcing blocks 22 slide into the heat dissipation grooves 21, leaving a space between the tips of the reinforcing blocks 22 and the bottom of the heat dissipation grooves 21.

[0070] The implementation principle of the grounding device for the shaft end of a motor shaft in this embodiment is as follows: there is a space between the tip of the reinforcing block 22 and the bottom of the heat dissipation groove 21, so as to facilitate the air circulation inside the heat dissipation groove 21 and improve the heat dissipation capacity of the conductive block 4. The reinforcing block 22 is snapped into the heat dissipation groove 21, thereby improving the stability of the conductive block 4 inside the receiving frame 3.

[0071] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A grounding device for the shaft end of a motor shaft, characterized in that: The system includes a first conductive seat (1) and a second conductive seat (2) arranged opposite to each other. The first conductive seat (1) is used to connect to the shaft end of the motor shaft, and the second conductive seat (2) is used to connect to the insulating frame on the vehicle body. A plurality of receiving frames (3) are fixedly installed on the side of the second conductive seat (2) near the first conductive seat (1). A conductive block (4) is slidably inserted inside the receiving frame (3). An elastic element (5) is installed inside the receiving frame (3). The elastic element (5) is used to drive the conductive block (4) to press against the first conductive seat (1). A conductive wire (8) is connected between the conductive block (4) and the second conductive seat (2). The second conductive seat (2) is electrically connected to the grounding system of the vehicle body. The conductive block (4) inside one of the receiving frames (3) can freely extend and retract, and the other receiving frames (3) are provided with a first locking rod (9). The receiving frame (3) has a first opening (10) for the first locking rod (9) to slide through, and the conductive block (4) has a limiting groove (14) for the first locking rod (9) to pass through. Multiple receiving frames (3) are arranged in a ring. A connecting block (15) is fixedly installed between two adjacent receiving frames (3). The connecting block (15) has a first receiving groove (16) for the first locking rod (9) to slide through. The connecting block (15) is equipped with a driving assembly (18). The driving assembly (18) is used to drive the first locking rod (9) to be pulled out from the limiting groove (14). The drive assembly (18) includes a second locking rod (181), a first guide block (182), and a second guide block (183). The connecting block (15) has a second receiving groove (17) through which the second locking rod (181) slides. The first receiving groove (16) and the second receiving groove (17) are interconnected. The receiving frame (3) has a second opening (11) through which the second locking rod (181) slides. The first guide block (182) is fixedly installed on the first locking rod (9) near the conductive block (9). 4) At one end, the first guide block (182) is inclined on the side close to the second conductive seat (2), and the second guide block (183) is fixedly installed on the end of the second locking rod (181) away from the conductive block (4). The side of the second guide block (183) is inclined for the first locking rod (9) to abut against. Multiple first locking rods (9) are pulled out in sequence, and the second locking rod (181) is inserted into the second opening (11) of the receiving frame (3) upstream of the first locking rod (9) in the pulling-out sequence.

2. The grounding device for the shaft end of a motor shaft according to claim 1, characterized in that: A third guide block (19) is fixedly installed at the end of the second locking rod (181) away from the second guide block (183). The third guide block (19) is inclined on the side away from the second conductive seat (2). A ball bearing (20) is interference-fitted on the side of the third guide block (19) away from the second locking rod (181).

3. A grounding device for the shaft end of a motor shaft according to claim 1, characterized in that: The elastic element (5) is a coil spring. A first mounting plate (6) is fixedly installed on the inner wall of the receiving frame (3). A second mounting plate (7) is fixedly installed on the side of the first mounting plate (6) near the second conductive seat (2). The second mounting plate (7) is bent to accommodate the bent part of the elastic element (5). The free end of the elastic element (5) is fixedly connected to the first mounting plate (6).

4. A grounding device for the shaft end of a motor shaft according to claim 3, characterized in that: The first mounting plate (6) has a third port (12) aligned with the first port (10), and the first mounting plate (6) has a fourth port (13) aligned with the second port (11).

5. A grounding device for the shaft end of a motor shaft according to claim 1, characterized in that: The conductive block (4) has multiple heat dissipation grooves (21) on its periphery.

6. A grounding device for the shaft end of a motor shaft according to claim 5, characterized in that: Multiple reinforcing blocks (22) are fixedly installed on the inner wall of the receiving frame (3), and the reinforcing blocks (22) are slidably disposed inside the heat dissipation groove (21).

7. A grounding device for the shaft end of a motor shaft according to claim 6, characterized in that: The reinforcing block (22) is triangular in shape, and the tip of the reinforcing block (22) is inserted into the heat dissipation groove (21). There is a space between the tip of the reinforcing block (22) and the bottom of the heat dissipation groove (21).

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