A shaft end grounding device capable of effectively reducing temperature

Abstract

The application discloses a kind of axle end grounding device capable of effectively cooling, belong to rail transit technical field, including inner shell, the brush holder of being set in inner shell inside, carbon brush is installed on brush holder, carbon brush is cooperated with the friction disc in inner shell, inner shell is the cylindrical structure of one end closed, the outside of inner shell is separately provided with outer shell, the inner contour of outer shell is adapted to the outer contour of inner shell, located in the end of inner shell, fixed with baffle ring between inner shell and outer shell, baffle ring separates the interval area between inner shell and outer shell into outer circle cavity and outer ring cavity, outer circle cavity and outer ring cavity are located in the outer end and outside of inner shell respectively, water inlet is provided on outer circle cavity, blow-off port is provided on outer ring cavity, water outlet for connecting outer circle cavity and outer ring cavity is formed in baffle ring;With outer ring cavity corresponding, discharge hole is formed in the side wall of inner shell.The application can effectively dissipate heat, improve the service life and operating stability of device.

Description

Technical Field

[0001] This invention belongs to the field of rail transit technology, specifically relating to a shaft end grounding device that can effectively reduce temperature. Background Technology

[0002] During subway vehicle operation, the axle-end grounding device is a crucial component ensuring the train's electrical safety and bearing protection. Its basic structure typically includes a grounding carbon brush fixed to the axle end, a conductive slip ring or friction disc that maintains sliding contact with the carbon brush, and a grounding wire that conducts current into the vehicle body. During operation, the sliding electrical contact between the carbon brush and the rotating slip ring inevitably results in the continuous shedding of micron-sized wear particles, which remain inside the casing. Because carbon powder itself has a certain degree of conductivity and high resistivity, when the accumulated amount reaches a critical level, the carbon powder alters the distribution of contact resistance, causing current to concentrate on localized micro-protrusions, forming high-temperature hotspots. It also hinders the path of frictional heat conduction to the casing, making heat more easily accumulate near the contact surface. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a shaft end grounding device that can effectively cool down the shaft, thereby improving the lifespan and operational stability of the device.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a shaft-end grounding device capable of effective cooling, comprising an inner shell, a brush holder disposed inside the inner shell, carbon brushes mounted on the brush holder, the carbon brushes cooperating with a friction disc inside the inner shell, the inner shell being a cylindrical structure closed at one end, and an outer shell disposed at a distance from the outer side of the inner shell, the inner contour of the outer shell conforming to the outer contour of the inner shell, a retaining ring fixed between the inner shell and the outer shell at the end of the inner shell, the retaining ring dividing the space between the inner shell and the outer shell into an outer circular cavity and an outer ring cavity, the outer circular cavity and the outer ring cavity being located at the outer end of the inner shell and the outer ring respectively, the outer circular cavity being provided with a water inlet, the outer ring cavity being provided with a drain outlet, and the retaining ring being provided with a water outlet for connecting the outer circular cavity and the outer ring cavity; a powder discharge hole is provided on the side wall of the inner shell corresponding to the outer ring cavity, the carbon powder inside the inner shell can enter the outer ring cavity through the powder discharge hole under the action of centrifugal force, a control valve is installed at the powder discharge hole, the control valve can be opened when the powder is collected in the outer ring cavity, and closed when the outer ring cavity is cleaned.

[0005] Furthermore, a telescopic device is installed on the retaining ring, and a sliding ring is fixedly connected to the output end of the telescopic device. The sliding ring has first through holes evenly spaced along the circumference. A rotating ring is rotatably connected to the end face of the sliding ring away from the telescopic device. The rotating ring has second through holes evenly spaced along the circumference. The first through holes and the second through holes correspond one-to-one. The outer side of the rotating ring is provided with external threads, and the inner wall of the outer shell is provided with internal threads corresponding to the external threads.

[0006] Furthermore, the outer wall of the inner shell is provided with a sliding groove, and the control valve includes a slider that is slidably disposed in the sliding groove. The slider is provided with a through hole corresponding to the powder discharge hole. The slider is connected to the inner shell through an elastic tensioning device. A first magnet is fixed on the inner side of the sliding ring, and a second magnet corresponding to the first magnet is fixed on the slider.

[0007] Furthermore, a limiting groove is formed on the end face of the sliding ring facing the rotating ring. The limiting groove is annular. A limiting head is fixed on the end face of the rotating ring facing the sliding ring by a connecting rod. The limiting head is slidably installed in the limiting groove.

[0008] Furthermore, a central shaft is coaxially connected to the friction disc, and a central hole is opened in the center of the brush holder for the central shaft to pass through. After passing through the central hole, the central shaft is connected to the rotating frame through a bracket. The rotating frame is rotatably installed inside the inner housing, and a fan blade is installed on the rotating frame. When the central shaft drives the fan blade to rotate, the fan blade provides airflow to the space of the inner housing towards the side where the friction disc is located. A rotating ring is rotatably installed on the bracket towards the side of the brush holder, and the rotating ring is connected to the brush holder through a support spring.

[0009] Furthermore, an agitator blade is rotatably mounted on the inner side of the outer cavity, and the agitator blade is connected to a geared motor, which is fixed on the outer side of the outer shell.

[0010] Furthermore, the outer cavity is filled with water, and a heat sink is fixed on the end face of the inner shell, with both ends of the heat sink extending to the inner side of the outer cavity and the inner shell, respectively.

[0011] Furthermore, a convex ring is fixed to the outer side of the inner shell, and the outer shell is threaded onto the outer side of the convex ring. The convex ring supports the outer shell and the inner shell to form an outer ring cavity. The heat sink supports the outer shell and the inner shell to form an outer circular cavity. A flange is fixed to the outer side of the outer shell.

[0012] The beneficial effects of this invention are as follows: This invention discloses a shaft-end grounding device capable of effective cooling. Through the design of an outer circular cavity and an outer ring cavity, carbon powder generated by the friction between the carbon brush and the friction disc is thrown against the inner wall of the inner housing under centrifugal force. Most of the carbon powder enters the outer ring cavity through the powder discharge hole and is collected, effectively preventing conductive carbon powder from entering the bearing and avoiding contamination of grease that could lead to temperature rise. In subsequent processes, water from the outer circular cavity can enter the outer ring cavity and clean the carbon powder there, further reducing carbon powder residue and providing timely cleaning. Since the outer circular cavity is constantly filled with cooling water, it also provides timely cooling, effectively reducing the temperature of the shaft-end grounding device. Attached Figure Description

[0013] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view of point B in the middle; Figure 4 This is a schematic diagram of the structure of a sliding ring and a rotating ring; Figure 5 This is a schematic diagram of the rotating frame structure; Figure 6 This is a diagram showing the four positions.

[0014] The following components are labeled in the attached diagram: Inner shell 1, Brush holder 2, Carbon brush 3, Friction disc 4, Outer shell 5, Retaining ring 6, Outer cavity 7, Outer ring cavity 8, Water inlet 9, Sewage outlet 10, Water outlet 11, Powder discharge hole 12, Telescopic device 13, Sliding ring 14, First through hole 15, Rotating ring 16, Second through hole 17, Slide groove 18, Sliding block 19, Through hole 20, Elastic tensioning device 21, First magnet 22, Second magnet 23, Limiting groove 24, Connecting rod 25, Limiting head 26, Central shaft 27, Central hole 28, Bracket 29, Rotating frame 30, Fan blade 31, Rotating ring 32, Support spring 33, Agitator blade 34, Gear motor 35, Heat sink 36, Convex ring 37, Flange 38. Detailed Implementation

[0015] like Figures 1-5 As shown, the present invention discloses a shaft end grounding device capable of effective cooling, comprising an inner housing 1, a brush holder 2 disposed inside the inner housing 1, and carbon brushes 3 mounted on the brush holder 2. The carbon brushes 3 cooperate with a friction disc 4 inside the inner housing 1. The inner housing 1 is a cylindrical structure closed at one end. An outer shell 5 is disposed on the outer side of the inner housing 1 at intervals. The inner contour of the outer shell 5 is adapted to the outer contour of the inner housing 1. A retaining ring 6 is fixed at the end of the inner housing 1 between the inner housing 1 and the outer shell 5. The retaining ring 6 divides the space between the inner housing 1 and the outer shell 5 into an outer circular cavity 7 and an outer annular cavity 8. The outer circular cavity 7 and the outer ring cavity 8 are located at the outer end of the inner shell 1 and the outer side of the outer shell 1, respectively. The outer circular cavity 7 is provided with a water inlet 9, and the outer ring cavity 8 is provided with a drain outlet 10. The baffle ring 6 is provided with a water outlet 11 for connecting the outer circular cavity 7 and the outer ring cavity 8. Corresponding to the outer ring cavity 8, a powder discharge hole 12 is provided on the side wall of the inner shell 1. The carbon powder in the inner shell 1 can enter the outer ring cavity 8 through the powder discharge hole 12 under the action of centrifugal force. A control valve is installed at the powder discharge hole 12. The control valve can be opened when the powder is collected in the outer ring cavity 8 and closed when the outer ring cavity 8 is cleaned.

[0016] This invention constructs the inner housing 1 as a cylindrical structure closed at one end, with an outer housing 5 spaced apart on its outer side. This creates a space between the inner housing 1 and the outer housing 5, allowing for the flow of cooling medium and providing a circulation path for cooling and cleaning. Specifically, during operation, carbon powder generated by the high-speed friction between the carbon brush 3 and the friction disc 4 is thrown to the inner wall of the inner housing 1 under centrifugal force and enters the outer annular cavity 8 through the powder discharge hole 12 on the side wall of the inner housing 1 for centralized collection. This guides the carbon powder to an area away from the bearing, fundamentally preventing conductive carbon powder from intruding into the bearing and contaminating the lubricating grease, effectively curbing abnormal temperature rise caused by grease deterioration. Furthermore, the control valve installed at the powder discharge hole 12 can precisely adjust its opening and closing state when needed. When the outer annular cavity 8 collects powder, the valve opens to allow the carbon powder to fall smoothly in, while the valve closes when the outer annular cavity 8 is being cleaned to prevent cleaning water from flowing back into the inner housing 1, ensuring high efficiency in carbon powder collection. The cooling water constantly filling the outer cavity 7 not only continuously removes the heat generated during the operation of the grounding device through heat exchange, but also flows into the outer ring cavity 8 through the outlet 11 during cleaning operations to flush away accumulated carbon powder, thus achieving an organic unity of cooling and cleaning functions. The entire device has a compact structure and reasonable circulation, which not only solves the heat dissipation problem under high-speed grounding conditions, but also eliminates the long-standing hidden danger of carbon powder contamination, significantly improving the operational reliability and service life of the shaft-end grounding device in heavy-load application scenarios such as rail transit.

[0017] In this embodiment, a telescopic device 13 is installed on the retaining ring 6. A sliding ring 14 is fixedly connected to the output end of the telescopic device 13. First through holes 15 are evenly spaced along the circumference of the sliding ring 14. A rotating ring 16 is rotatably connected to the end face of the sliding ring 14 away from the telescopic device 13. Second through holes 17 are evenly spaced along the circumference of the rotating ring 16. The first through holes 15 and the second through holes 17 correspond one-to-one. An external thread is provided on the outer side of the rotating ring 16, and an internal thread corresponding to the external thread is provided on the inner wall of the outer casing 5. The telescopic device 13 drives the sliding ring 14 and the rotating ring 16 to move. While moving, the rotating ring 16 can rotate relative to the sliding ring 14 under the action of the thread, thereby adjusting the relative position between the first through holes 15 and the second through holes 17. When the first through hole 15 and the second through hole 17 are aligned, the outer circular cavity 7 and the outer annular cavity 8 can be connected, which facilitates cleaning. When the two are misaligned, the channels of the outer circular cavity 7 and the outer annular cavity 8 are closed, which can ensure the high efficiency of toner collection and prevent toner agglomeration from causing channel blockage, which greatly improves cleaning efficiency.

[0018] In this embodiment, a groove 18 is provided on the outer wall of the inner housing 1. The control valve includes a slider 19 that slides within the groove 18. The slider 19 has a through hole 20 corresponding to the powder discharge hole 12. The slider 19 is connected to the inner housing 1 via an elastic tensioning device 21. A first magnet 22 is fixed to the inner side of the sliding ring 14, away from the sliding ring 14. Along the axial direction of the inner housing 1, the output end of the telescopic device 13 is preset with a first position, a third position, a fourth position, and a second position, with the first position being closest to the side where the outer cavity 7 is located. When the output end of the telescopic device 13 is in the first position, the slider 19 is pulled to the right by the elastic tensioning device 21, the through hole 20 is offset from the powder discharge hole 12, and the first through hole 15 and the second through hole 17 are aligned, which is the cleaning position. When the output end of the telescopic device 13 continues to move to the right, after passing the second position, until the first magnet 22 and the second magnet 23 attract and overlap, this is the third position, where the first through hole 15 and the second through hole 17 are offset. After continuous movement, reaching the fourth position at the far right, the sewage in the outer ring cavity 8 can be discharged. When the sliding ring 14 moves back from the fourth position to the second position, after overcoming the static friction between the first magnet 22 and the second magnet 23, the first magnet 22 and the second magnet 23 separate, and the slider 19 returns to its original position.

[0019] In this embodiment, a limiting groove 24 is formed on the end face of the sliding ring 14 facing the rotating ring 16. The limiting groove 24 is annular. A limiting head 26 is fixed to the end face of the rotating ring 16 facing the sliding ring 14 by a connecting rod 25. The limiting head 26 is slidably installed in the limiting groove 24. This invention allows the rotating ring 16 to rotate freely relative to the sliding ring 14, but at the same time restricts the axial displacement of the rotating ring 16 relative to the sliding ring 14, ensuring that the two always maintain a defined axial relative position when driven by the telescopic device 13.

[0020] In this embodiment, a central shaft 27 is coaxially connected to the friction disk 4. A central hole 28 is provided in the center of the brush holder 2 for the central shaft 27 to pass through. After passing through the central hole 28, the central shaft 27 is connected to the rotating frame 30 via a bracket 29. The rotating frame 30 is rotatably mounted inside the inner housing 1. A fan blade 31 is mounted on the rotating frame 30. When the central shaft 27 drives the fan blade 31 to rotate, the fan blade 31 provides airflow towards the side of the friction disk 4 in the space of the inner housing 1, forming a directional airflow inside the inner housing 1, which can accelerate heat exchange. A rotating ring 32 is rotatably mounted on the bracket 29 towards the side of the brush holder 2. The rotating ring 32 is connected to the brush holder 2 via a support spring 33. Under the action of the spring force, the brush holder 2 produces a slight axial float, thereby automatically compensating for the increased gap between the carbon brush 3 and the friction disk 4 after wear, ensuring that the carbon brush 3 always maintains a suitable contact pressure with the friction disk 4.

[0021] In this embodiment, an agitator blade 34 is rotatably mounted on the inner side of the outer circular cavity 7. The agitator blade 34 is connected to a geared motor 35, which is fixed on the outer side of the outer casing 5. The geared motor 35 is fixed on the outer side of the outer casing 5, and its output shaft extends into the outer circular cavity 7 to drive the agitator blade 34 to rotate. During the rotation of the blade, the cooling water in the cavity is subjected to forced disturbance, which breaks the natural convection pattern of the stagnant water and forms a strong forced convection heat transfer.

[0022] In this embodiment, the outer cavity 7 is filled with water, and a heat sink 36 is fixed on the end face of the inner shell 1. The two ends of the heat sink 36 extend to the inner sides of the outer cavity 7 and the inner shell 1, respectively. The heat sink 36 provides a larger heat exchange area and a more direct heat transfer path. Heat does not need to pass through the wall of the inner shell 1 and then undergo convection heat exchange between the water and the wall. Instead, it is directly conducted from the high-temperature area to the low-temperature cooling water through the metal heat sink 36, significantly shortening the heat transfer chain length. When the stirring blade 34 is working, the heat sink 36 can also cut the water flow to generate a turbulence effect, further enhancing the heat exchange effect.

[0023] In this embodiment, a convex ring 37 is fixed to the outer side of the inner shell 1, and the outer shell 5 is threaded onto the outer side of the convex ring 37. The convex ring 37 supports the outer shell 5 and the inner shell 1 to form an outer annular cavity 8. The heat sink 36 supports the outer shell 5 and the inner shell 1 to form an outer circular cavity 7. A flange 38 is fixed to the outer side of the outer shell 5. The convex ring 37 fixed to the outer side of the inner shell 1 and the threaded engagement with the outer shell 5 not only achieve a reliable connection between the outer shell 5 and the inner shell 1, but also cleverly utilizes the axial support of the convex ring 37 to enclose the outer annular cavity 8 between the outer shell 5 and the inner shell 1, which facilitates subsequent cleaning and maintenance. Of course, the connection between the inner shell 1 and the outer shell 5 is not limited to the threaded connection method, as those skilled in the art should understand.

Claims

1. A shaft end grounding device capable of effectively cooling down, characterized in that: The device includes an inner shell, a brush holder located inside the inner shell, carbon brushes mounted on the brush holder, and friction discs inside the inner shell. The inner shell is a cylindrical structure closed at one end. An outer shell is located on the outer side of the inner shell, with its inner contour matching the outer contour of the inner shell. A retaining ring is fixed between the inner shell and the outer shell at the end of the inner shell, dividing the space between them into an outer circular cavity and an outer ring cavity. The outer circular cavity and the outer ring cavity are located at the outer end of the inner shell and the outer ring, respectively. An inlet is provided on the outer circular cavity, and a drain outlet is provided on the outer ring cavity. An outlet is provided on the retaining ring to connect the outer circular cavity and the outer ring cavity. Corresponding to the outer ring cavity, a powder discharge hole is provided on the side wall of the inner shell. Carbon powder inside the inner shell can enter the outer ring cavity through the powder discharge hole under the action of centrifugal force. A control valve is installed at the powder discharge hole, which can be opened when the powder is collected in the outer ring cavity and closed when the outer ring cavity is cleaned.

2. The shaft end grounding device capable of effectively cooling according to claim 1, characterized in that: A telescopic device is installed on the retaining ring. A sliding ring is fixedly connected to the output end of the telescopic device. The sliding ring has first through holes evenly spaced along the circumference. A rotating ring is rotatably connected to the end face of the sliding ring away from the telescopic device. The rotating ring has second through holes evenly spaced along the circumference. The first through holes and the second through holes correspond one-to-one. The outer side of the rotating ring is provided with external threads. The inner wall of the outer shell is provided with internal threads corresponding to the external threads.

3. The shaft end grounding device capable of effectively cooling according to claim 2, characterized in that: The outer wall of the inner shell is provided with a sliding groove. The control valve includes a slider that is slidably disposed in the sliding groove. The slider is provided with a through hole corresponding to the powder discharge hole. The slider is connected to the inner shell through an elastic tensioning device. A first magnet is fixed on the inner side of the sliding ring, and a second magnet corresponding to the first magnet is fixed on the slider.

4. A shaft end grounding device capable of effectively cooling according to claim 3, characterized in that: A limiting groove is provided on the end face of the sliding ring facing the rotating ring. The limiting groove is annular. A limiting head is fixed on the end face of the rotating ring facing the sliding ring by a connecting rod. The limiting head is slidably installed in the limiting groove.

5. A shaft end grounding device capable of effectively cooling according to any one of claims 1-4, characterized in that: A central shaft is coaxially connected to the friction disc. A central hole is opened in the center of the brush holder for the central shaft to pass through. After passing through the central hole, the central shaft is connected to the rotating frame through a bracket. The rotating frame is rotatably installed inside the inner housing. Fan blades are installed on the rotating frame. When the central shaft drives the fan blades to rotate, the fan blades provide airflow to the space of the inner housing towards the side where the friction disc is located. A rotating ring is rotatably installed on the bracket towards the side of the brush holder. The rotating ring is connected to the brush holder through a support spring.

6. A shaft end grounding device capable of effectively cooling according to claim 5, characterized in that: An agitator blade is rotatably mounted on the inner side of the outer cavity. The agitator blade is connected to a geared motor, which is fixed on the outer side of the outer shell.

7. A shaft end grounding device capable of effectively cooling according to claim 6, characterized in that: The outer cavity is filled with water, and a heat sink is fixed on the end face of the inner shell. The two ends of the heat sink extend to the inner side of the outer cavity and the inner shell, respectively.

8. A shaft end grounding device capable of effectively cooling according to claim 7, characterized in that: A convex ring is fixed to the outer side of the inner shell, and the outer shell is threaded onto the outer side of the convex ring. The convex ring is supported between the outer shell and the inner shell to form an outer ring cavity. The heat sink is supported between the outer shell and the inner shell to form an outer circular cavity. A flange is fixed to the outer side of the outer shell.

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