Grounding device with cooling function

Abstract

The utility model discloses a grounding device with a cooling function, which relates to the technical field of rail transit equipment and comprises a friction disc, a carbon brush, a carbon brush holder and a grounding end cover, the friction disc is fixedly connected with an axle of a rail transit vehicle through a spline and rotates synchronously along with the axle, and the carbon brush is mounted on the carbon brush holder and is in sliding contact with the surface of the friction disc. A small fan is installed at the center of the outer side of the friction disc, blades of the small fan face the carbon brushes and the carbon brush holder, and the small fan synchronously rotates along with the friction disc. The small fan blades are fixedly installed at the center of the friction disc, and kinetic energy generated when the friction disc rotates along with the axle at a high speed is used for driving the fan to synchronously rotate; active cooling of the carbon brush and the carbon brush holder is achieved, carbon powder generated by friction is blown into the end cover, carbon powder accumulation is avoided, an additional power source is not needed, the structure is simple, the heat dissipation efficiency and operation reliability of the grounding device can be effectively improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of grounding devices for rail transit vehicles, and in particular to a grounding device with built-in cooling. Background Technology

[0002] In rail transit vehicles, the bogie axle end grounding device is a key component to ensure the safe operation of the vehicle's electrical system. It mainly achieves current conduction through the sliding contact between carbon brushes and friction discs.

[0003] The existing shaft-end grounding device has a small installation space and is in a closed and sealed environment with poor heat dissipation conditions. Secondly, the current passing through it is large and the friction disc rotates at high speed during operation. The high-speed friction between the carbon brush and the friction disc generates a lot of heat, causing the carbon brush, carbon brush holder and friction disc to be too hot. Moreover, the carbon powder generated during the friction process is easy to accumulate on the carbon brush surface, which further affects the heat dissipation efficiency and conductivity.

[0004] However, existing technologies mostly reduce the temperature of the friction pair by improving the material composition of carbon brushes and friction discs, but due to limitations in material properties, the cooling effect is limited and it is difficult to meet the requirements of long-term stable operation.

[0005] To solve the above problems, this utility model provides a grounding device with built-in cooling. Utility Model Content

[0006] In view of the shortcomings of the prior art, this utility model provides a grounding device with built-in cooling, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a grounding device with built-in cooling, comprising a friction disc, a carbon brush, a carbon brush holder and a grounding end cover, wherein the friction disc is fixedly connected to the axle of a rail transit vehicle via a spline and rotates synchronously with it, and the carbon brush is mounted on the carbon brush holder and slides in contact with the surface of the friction disc.

[0008] A small fan is installed at the center of the outer side of the friction disc. The blades of the small fan are oriented towards the carbon brush and the carbon brush holder, and the small fan rotates synchronously with the friction disc.

[0009] As a further technical solution of this utility model, the small fan is fixed to the center position of the outer side of the friction disk by a fixing bracket, and the fixing bracket is fixed to the friction disk by bolts or welding.

[0010] As a further technical solution of this utility model, the blades of the small fan are made of high-temperature resistant aluminum alloy, and the number of blades of the small fan is 3-6.

[0011] As a further technical solution of this utility model, the blade angle of the small fan is 30°-40°, and the small fan generates airflow along the axial direction toward the grounding end cover when it rotates.

[0012] As a further technical solution of this utility model, the grounding end cover is installed on the outside of the friction disc, carbon brush and carbon brush holder, and is sealed to the axle of the rail transit vehicle to form a closed space.

[0013] As a further technical solution of this utility model, the grounding end cover has multiple mounting ears distributed in a circular pattern around its perimeter, and mounting holes are provided on the mounting ears. The outer side of the grounding end cover is also provided with a cable extending into it.

[0014] This utility model provides a grounding device with built-in cooling, which has the following advantages compared with the prior art:

[0015] 1. This design features a grounding device with built-in cooling. It utilizes the rotation of the friction disc to drive a small fan, eliminating the need for an additional power source. This generates a continuous airflow to cool the carbon brush and brush holder, significantly reducing the temperature of the friction pair and preventing component aging or failure due to high temperatures. Furthermore, the airflow generated by the small fan can promptly blow away carbon powder generated by the friction between the carbon brush and the friction disc from the carbon brush surface, preventing accumulation that could lead to poor contact or obstructed heat dissipation, and improving conductivity stability.

[0016] 2. The grounding device with built-in cooling in this design simply integrates a small fan structure on the friction plate, without requiring major modifications to the existing grounding device. It is easy to install and maintain and has strong adaptability. Attached Figure Description

[0017] Figure 1 A first structural view of a grounding device with built-in cooling;

[0018] Figure 2 This is a second structural view of a grounding device with built-in cooling.

[0019] Figure 3 A cross-sectional view of a grounding device with built-in cooling;

[0020] Figure 4 This is a schematic diagram of the installation of a small fan with a built-in cooling grounding device.

[0021] In the diagram: 1. Friction disc; 11. Spline; 12. Carbon brush holder; 13. Small fan; 14. Mounting bracket; 15. Carbon brush; 2. Grounding end cap; 21. Mounting ear; 22. Cable. Detailed Implementation

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

[0023] Please see Figure 1-4 This utility model provides a technical solution for a grounding device with self-cooling: a grounding device with self-cooling includes a friction disc 1, a carbon brush 15, a carbon brush holder 12 and a grounding end cover 2. The friction disc 1 is fixedly connected to the axle of the rail transit vehicle through a spline 11 and rotates synchronously with it. The carbon brush 15 is installed on the carbon brush holder 12, and its end is in elastic contact with the outer circumferential surface of the friction disc 1 to realize current conduction.

[0024] A small fan 13 is installed at the center of the outer side of the friction disc 1. The small fan 13 is a non-powered fan with blades, such as... Figure 4 As shown, the small fan 13 is fixed to the end face of the central shaft hole of the friction disk 1 by the fixing bracket 14. The fixing bracket 14 is fixed to the friction disk 1 by bolts or welding. The blades of the small fan 13 are set towards the carbon brush 15 and the carbon brush holder 12, and the small fan 13 rotates synchronously with the friction disk 1.

[0025] The blades of the small fan 13 are made of high-temperature resistant aluminum alloy, and the number of blades of the small fan 13 is 3-6. The blade angle of the small fan 13 is 30°-40°. When the small fan 13 rotates, it generates airflow along the axial direction toward the grounding end cover 2. It should be added that the blade thickness of the small fan 13 is 2-5mm, and the diameter is 1 / 3 of the diameter of the friction disk 1, to ensure that sufficient airflow is generated in a limited space and does not affect the normal contact between the friction disk 1 and the carbon brush 15.

[0026] The grounding end cover 2 is installed on the outside of the friction disc 1, carbon brush 15 and carbon brush holder 12, and is sealed to the axle of the rail transit vehicle to form a closed space. The airflow generated by the small fan 13 blows the carbon powder into the annular gap between the grounding end cover 2 and the friction disc 1.

[0027] The grounding end cover 2 has multiple mounting ears 21 arranged in a circle around its perimeter, and mounting holes are provided on the mounting ears 21. The outer side of the grounding end cover 2 is also provided with a cable 22 extending into it.

[0028] The working principle of this utility model is as follows: When the vehicle is running, the axle of the rail transit vehicle drives the friction disc 1 to rotate at high speed, and the small fan 13 rotates synchronously with it. The airflow generated by the blades of the small fan 13 blows directly onto the carbon brush 15 and the carbon brush holder 12, accelerating the heat dissipation. At the same time, the airflow peels the carbon powder generated by friction from the surface of the carbon brush 15 and blows it into the gap inside the end cover grounding end cover 2 to avoid accumulation.

[0029] The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model. These improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices and operating methods not specifically described and explained in this utility model shall be implemented in accordance with conventional means in this art unless otherwise specified or limited.

Claims

1. A grounding device with built-in cooling, characterized in that, It includes a friction disc (1), a carbon brush (15), a carbon brush holder (12) and a grounding end cap (2). The friction disc (1) is fixedly connected to the axle of the rail transit vehicle through a spline (11) and rotates synchronously with it. The carbon brush (15) is mounted on the carbon brush holder (12) and slides in contact with the surface of the friction disc (1). A small fan (13) is installed at the center of the outer side of the friction disc (1). The blades of the small fan (13) are set towards the carbon brush (15) and the carbon brush holder (12), and the small fan (13) rotates synchronously with the friction disc (1).

2. The grounding device with built-in cooling according to claim 1, characterized in that, The small fan (13) is fixed to the center of the outer side of the friction disc (1) by a fixing bracket (14), which is fixed to the friction disc (1) by bolts or welding.

3. The grounding device with built-in cooling according to claim 1, characterized in that, The blades of the small fan (13) are made of high-temperature resistant aluminum alloy, and the number of blades of the small fan (13) is 3-6.

4. The grounding device with built-in cooling according to claim 1, characterized in that, The blade angle of the small fan (13) is 30°-40°, and the small fan (13) generates an airflow along the axial direction toward the ground end cover (2) when it rotates.

5. A grounding device with built-in cooling according to claim 1, characterized in that, The grounding end cover (2) is placed on the outside of the friction disc (1), carbon brush (15) and carbon brush holder (12), and is sealed to the axle of the rail transit vehicle to form a closed space.

6. A grounding device with built-in cooling according to claim 1, characterized in that, The grounding end cover (2) has multiple mounting ears (21) arranged in a circle around its perimeter, and mounting holes are provided on the mounting ears (21). The outer side of the grounding end cover (2) is also provided with a cable (22) extending into its interior.

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