Shaft current leading-out device

Abstract

The utility model relates to a shaft current leading-out device. The leading-out device comprises an annular fixing support and a carbon fiber bundle. The carbon fiber bundle is arranged on the fixing support in a bent mode, the arc portion, protruding out of the inner wall of the fixing support, of the carbon fiber bundle forms a brush head making contact with the rotating shaft, the guiding-out device further comprises a baffle for fixing the carbon fiber bundle, and the baffle is connected with the fixing support. The device can keep the contact force of the brush head stable and reduce the loss of the brush head.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, and more specifically, to a shaft current extraction device. Background Technology

[0002] Electrolytic corrosion is one of the factors causing premature failure of motor shafts. In engineering applications, grounding carbon brushes are usually used to eliminate the potential difference between the inner and outer rings of the shaft to prevent electrolytic corrosion. However, commonly used grounding carbon brushes have disadvantages such as wear requiring regular maintenance and replacement, and the generation of carbon powder affecting the motor's insulation environment. To address this problem, carbon fiber brushes with good conductivity and wear resistance have emerged.

[0003] However, existing publicly available carbon fiber brushes still use individual fiber bundle brush heads as basic units to form a circumferential brush with a cantilever structure. This type of fiber brush has two significant drawbacks: First, the individual fiber bundle brush heads represent dispersed point contact, which makes them more prone to dispersion under stress, failing to guarantee a continuous and stable contact state. Furthermore, the cantilevered brush heads lack sufficient restoring force after being subjected to stress, leading to fluctuations in contact force and high frictional resistance during high-speed rotation (or high contact tangential velocity). Second, the individual fiber bundle brush heads need to be individually fixed, resulting in a complex fixing structure and cumbersome assembly process. Ultimately, this leads to unstable contact force and high manufacturing costs.

[0004] Existing technology CN113178980B discloses a shaft grounding protection device, which includes: a device body, the device body being annular, having at least one mounting hole on its side wall, the mounting hole being in a first direction, the first direction being towards the center of the device body and penetrating radially along the device body; and conductive fibers, the conductive fibers passing through the mounting hole to be disposed on the device body, the conductive fibers extending towards the center of the device body; wherein, when the conductive fibers pass through the mounting hole, the pressure in a second direction of the mounting hole is adjusted to achieve crimping between the conductive fibers and the device body, the second direction being perpendicular to the first direction, and during crimping, a pressure force is applied inward along the axial direction of the device body on both sides of the device body to crimp the conductive fibers into the device body, so that the conductive fibers are fan-shaped in the mounting hole, and crimping holes are formed at the points of application of the pressure force on the device body.

[0005] Existing carbon fiber brushes still use individual fiber bundles as basic units to form a circumferential brush with a cantilever structure. This type of fiber brush also suffers from the two significant drawbacks mentioned above: first, the individual fiber bundles cannot guarantee a continuous and stable contact state and result in high frictional resistance; second, the fixing structure of the individual fiber bundles is complex and the assembly process is cumbersome. In other words, existing technologies cannot solve the technical problems of unstable brush head contact force and high manufacturing costs. Utility Model Content

[0006] To overcome the above-mentioned defects, this utility model discloses an shaft current extraction device for reducing brush head wear.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0008] A shaft current extraction device is disclosed. The extraction device includes a ring-shaped fixed bracket with good conductivity and a carbon fiber bundle. The carbon fiber bundle is bent and disposed on the fixed bracket. The arc portion of the carbon fiber bundle protruding from the inner wall of the fixed bracket forms a brush head that contacts the rotating shaft. The extraction device also includes a baffle that fixes the carbon fiber bundle and is connected to the fixed bracket.

[0009] Preferably, the arc-shaped outer wall of the fixing bracket is provided with an annular groove for fixing the carbon fiber bundle; the annular groove is provided with first through holes that connect to the inner wall of the fixing bracket at intervals, and the diameter of the first through holes is adapted to the diameter of the carbon fiber bundle. By providing the annular groove, the carbon fiber bundle is placed in the annular groove, thereby making the connection between the carbon fiber bundle and the fixing bracket more stable.

[0010] Preferably, the annular groove is further provided with a second through hole for fixing the tail of the carbon fiber bundle.

[0011] Preferably, the cross-section of the annular groove is semi-circular.

[0012] Preferably, the diameter of the annular groove is adapted to the carbon fiber bundle.

[0013] Preferably, there are 18 first through holes and 9 brush heads. The number of first through holes is twice the number of brush heads. The number of brush heads can be controlled by setting different numbers of first through holes as needed.

[0014] Preferably, the baffle includes bent pieces disposed on the arc-shaped outer wall of the fixed bracket; a slot is provided between the connected bent pieces.

[0015] Preferably, the slots are spaced apart.

[0016] Preferably, the dispensing device further includes a ring fitted inside a fixed bracket, with a semi-circular protrusion surrounding one end face of the ring, the diameter of which is the same as the diameter of the brush head.

[0017] Preferably, the number of protrusions corresponds to the number of brush heads.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The brush head of this utility model adopts an arc-shaped line contact, which has a large contact area, low contact resistance with the rotating shaft, low brush head wear, and stable and reliable contact. Even at high speeds, it has sufficient restoring force to maintain good contact performance, thus ensuring the stability of the brush head's contact force.

[0020] 2. This utility model device adopts a simple flange clamping and fixing method, which has a simple structure, requires no additional fixing parts, and is easy to mass-produce.

[0021] 3. A method for manufacturing a semi-circular "arch bridge" elastic carbon fiber structure is proposed. By adjusting the number of semi-circular brush heads and the size of the arc, the contact stiffness can be easily adjusted.

[0022] 4. This utility model adopts a U-shaped groove fixing bracket + continuous integral carbon fiber bundle to form several semi-circular "arch bridge" brush heads, which makes the brush heads not diverge, have good overall rigidity, strong rebound ability when in contact with force, and not easily damaged. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an shaft current extraction device according to the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of a fixed bracket for an shaft current extraction device according to the present invention;

[0025] Figure 3 This is a schematic diagram of the bending state of the carbon fiber bundle in an axial current extraction device of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the circular ring in an axial current extraction device according to the present invention;

[0027] Figure 5 This is a left view of the fixing bracket of an axial current extraction device according to the present invention;

[0028] Figure 6 This is a left view of the assembly of the fixed bracket and carbon fiber bundle in an axial current extraction device of this utility model. Detailed Implementation

[0029] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0031] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0034] Example 1

[0035] like Figures 1-5 As shown, an axial current extraction device is disclosed. The extraction device includes a circular fixed bracket 1 and a carbon fiber bundle 10. The carbon fiber bundle 10 is bent and disposed on the fixed bracket 1. The arc portion of the carbon fiber bundle 10 protruding from the inner wall of the fixed bracket 1 forms a brush head 2 that contacts the rotating shaft. The extraction device also includes a baffle for fixing the carbon fiber bundle 10. The baffle is connected to the fixed bracket 1.

[0036] In this embodiment, the fixing bracket is made of a material with good conductivity. The fixing bracket 1 is set in an arc shape, and the fiber bundle is bent and set on the fixing bracket 1. The arc part of the carbon fiber bundle 10 protruding from the inner wall of the fixing bracket 1 communicates with the brush head 2 which is in contact with the rotating shaft. The brush head 2 contacts the rotating shaft (rotating part), thereby dissipating static electricity on the rotating shaft and effectively preventing electro-corrosion of the rotating shaft. Since the brush head 2 is in contact with the rotating shaft, in order to prevent the carbon fiber bundle 10 from shifting relative to the fixing bracket 1 due to the contact force between the rotating shaft and the brush head when the shaft rotates, a baffle can also be set on the fixing bracket 1. The baffle fixes the carbon fiber bundle 10, thereby effectively preventing the carbon fiber bundle 10 from deviating relative to the fixing bracket 1 and ensuring effective contact between the brush head 2 and the rotating shaft.

[0037] The brush head 2 of this invention adopts an arc-shaped line contact, resulting in a large contact area, low contact resistance with the rotating shaft, and stable and reliable contact. Even at high speeds, it possesses sufficient restoring force to maintain good contact performance. This ensures stable contact force and reduces brush head damage.

[0038] Example 2

[0039] A shaft current extraction device is disclosed. The extraction device includes a circular fixed bracket 1 and a carbon fiber bundle 10. The carbon fiber bundle 10 is bent and disposed on the fixed bracket 1. The arc portion of the carbon fiber bundle 10 protruding from the inner wall of the fixed bracket 1 forms a brush head 2 that contacts the rotating shaft. The extraction device also includes a baffle for fixing the carbon fiber bundle 10. The baffle is connected to the fixed bracket 1.

[0040] The difference between this embodiment and Embodiment 1 is that, to facilitate fixing the carbon fiber bundle 10 to the fixing bracket 1, an annular groove 9 can be provided on the arc-shaped outer wall of the fixing bracket 1. First through holes 3 are spaced apart within the annular groove 9, connecting the annular groove 9 to the arc-shaped inner wall of the fixing bracket 1. One end of the carbon fiber bundle 10 is placed in the annular groove 9, and the other end passes back and forth through the spaced first through holes 3. Ultimately, the carbon fiber bundle 10 located on the arc-shaped outer wall side is securely fixed within the annular groove 9, while the carbon fiber bundle 10 located on the arc-shaped inner wall side forms multiple semi-circular arc sections, which constitute the brush head 2 in contact with the rotating shaft. Simultaneously, the diameters of the first through holes 3 and the annular groove 9 are exactly matched with the diameter of the carbon fiber bundle 10. This design forms several semi-circular "arch-shaped" brush heads 3, ensuring that the brush heads 3 do not diverge, have good overall rigidity, and strong rebound ability when subjected to contact force. Since the diameters of the annular groove 9 and the first through hole are the same as the diameter of the carbon fiber bundle 10, they can effectively fix the carbon fiber bundle 10, thereby preventing the carbon fiber bundle 10 from sliding relative to the fixed bracket 1 and ensuring that the brush head 2 is in contact with the rotating shaft.

[0041] In this embodiment, to further secure the carbon fiber bundle 10, a second through hole 4 for securing the tail of the carbon fiber bundle 10 can be provided in the annular groove 9. Specifically, the number of first through holes 3 can be set to 18, so that when the carbon fiber bundle 10 is bent, 9 brush heads 2 can be formed.

[0042] The brush head 2 of this invention adopts an arc-shaped line contact, resulting in a large contact area, low contact resistance with the rotating shaft, and stable and reliable contact. It also possesses sufficient restoring force to maintain good contact performance even at high speeds.

[0043] Example 3

[0044] A shaft current extraction device is disclosed. The extraction device includes a circular fixed bracket 1 and a carbon fiber bundle 10. The carbon fiber bundle 10 is bent and disposed on the fixed bracket 1. The arc portion of the carbon fiber bundle 10 protruding from the inner wall of the fixed bracket 1 forms a brush head 2 that contacts the rotating shaft. The extraction device also includes a baffle for fixing the carbon fiber bundle 10. The baffle is connected to the fixed bracket 1.

[0045] The difference between this embodiment and the above embodiment is that the baffle specifically includes an annular piece 5 disposed on the arc-shaped outer wall of the fixed bracket, and slots 6 are provided at intervals on the annular piece 5. The annular piece 5 can rotate relative to the fixed bracket 1 under the action of external force. Specifically, the annular piece 5 and the fixed bracket 1 are integrally formed. The annular piece 5 bends and deforms under the action of external force, thereby covering the carbon fiber bundles 10 in the annular groove 9. The purpose of providing the slots 6 is to facilitate the bending of the annular piece 5.

[0046] In this embodiment, to ensure that each brush head 2 is the same size, the delivery device may also include a ring 7 for winding the brush head, the outer diameter of the ring 7 being the same as the inner diameter of the fixing bracket 1. A semi-circular protrusion 8 is arranged around one end face of the ring 7, the diameter of the protrusion 8 being the same as the diameter of the brush head 2. First, the ring 8 is fitted into the fixing bracket 1, and then the carbon fiber bundle 10 passes through the first through hole 3 to the arc-shaped inner side of the fixing bracket 1, and then passes around the protrusion 8 through the second first through hole 3 into the annular groove 9. Finally, the carbon fiber bundle 10 completes the bending in sequence. The simple flange clamping and fixing method results in a simple structure, requires no additional fixing parts, and is convenient for mass production.

[0047] By adding a removable ring mold, the dimensions of each brush head 2 are ensured to be consistent. At the same time, it significantly reduces the winding time of the carbon fiber bundle 10, thereby improving the manufacturing efficiency of this device.

[0048] In the accompanying drawings, the same or similar reference numerals correspond to the same or similar components; the positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent. Clearly, the above-described embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A shaft current extraction device, characterized in that, The export device includes a ring-shaped fixed bracket and a carbon fiber bundle; the carbon fiber bundle is bent and disposed on the fixed bracket, and the arc portion of the carbon fiber bundle protruding from the inner wall of the fixed bracket constitutes a brush head that contacts the rotating shaft. The export device also includes a baffle for fixing the carbon fiber bundle, and the baffle is connected to the fixed bracket.

2. The shaft current extraction device according to claim 1, characterized in that, The fixed bracket has an annular groove for fixing carbon fiber bundles on its arc-shaped outer wall; the annular groove is provided with first through holes that connect to the inner wall of the fixed bracket at intervals, and the diameter of the first through holes is adapted to the diameter of the carbon fiber bundles.

3. The shaft current extraction device according to claim 2, characterized in that, The annular groove is also provided with a second through hole for fixing the tail of the carbon fiber bundle.

4. The shaft current extraction device according to claim 2, characterized in that, The cross-section of the annular groove is semi-circular.

5. The shaft current extraction device according to claim 4, characterized in that, The diameter of the annular groove is adapted to the diameter of the carbon fiber bundle.

6. The shaft current extraction device according to claim 2, characterized in that, The first through hole has 18 holes, and the brush head has 9 holes.

7. The shaft current extraction device according to claim 1, characterized in that, The baffle includes bent pieces disposed on the arc-shaped outer wall of the fixed bracket; grooves are provided between connected bent pieces.

8. The shaft current extraction device according to claim 7, characterized in that, The slots are spaced apart.

9. The shaft current extraction device according to claim 1, characterized in that, The dispensing device also includes a ring fitted inside a fixed bracket, with a semi-circular protrusion surrounding one end face of the ring, the diameter of which is the same as the diameter of the brush head.

10. A shaft current extraction device according to claim 9, characterized in that, The number of protruding posts corresponds to the number of brush heads.

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