Conducting ring capable of preventing electrocorrosion of bearing

Abstract

A conducting ring for preventing electrocorrosion of a bearing comprises a circular-ring-shaped outer body and a plurality of conducting fiber bundles arranged in the outer body, each conducting fiber bundle is composed of a plurality of conducting fiber filaments, and the appearance of each conducting fiber bundle is of a U-shaped structure comprising two end portions, two corner portions and a bottom. The conductive fiber bundles are circumferentially distributed around the circle center of the outer body, and an opening of each conductive fiber bundle faces the end deviating from the circle center of the outer body. In the use process, the U-shaped bottoms of the conductive fiber bundles are firstly in contact with the motor shaft to be stressed, the U-shaped bottoms, in contact with the motor shaft, of the conductive fiber bundles are firstly abraded and fractured under the working state of the motor shaft, and the fractured roots of the bottoms are further in contact with the motor shaft to continue to conduct electricity to play a dredging role; it is ensured that the conductive fiber bundles can be effectively connected with the motor shaft and the motor metal body to the maximum extent, the service life is longer, and the replacement frequency of the conductive ring is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing protection rings, in particular to a conductive ring for preventing electrical corrosion of bearings. Background Art

[0002] The drive motor's bearing raceways consist of inner and outer raceways. During normal motor operation, the bearing balls rotate at high speeds within the grease, which surrounds them. Because of the grease's insulating properties, there's no metal-to-metal contact between the inner and outer raceways, making the entire bearing equivalent to a capacitor. However, when the shaft voltage exceeds the grease's breakdown voltage, the grease breaks down, creating a short circuit between the inner and outer raceways. Discharge occurs along the path of least resistance between the bearings, generating a discharge current that triggers electrical discharge (EDM), causing wear and even flaking of the bearing balls. This creates a washboard pattern on the bearing raceways, a phenomenon known as electrical corrosion. This phenomenon can cause unusual noise and vibration in the drive motor.

[0003] Currently, a common preventative measure against electrical corrosion in bearings is to establish an effective shaft voltage discharge bypass to reduce the shaft voltage between the outer and inner rings of the bearing. Specifically, in practice, a conductive ring is often installed on the motor shaft to provide a low-impedance path from the motor shaft to the motor housing. The conductive ring directly short-circuits the motor housing and shaft, thereby reducing the shaft voltage and current.

[0004] In the related art, the bearing electrical corrosion protection conductive ring and motor disclosed in publication number CN217036976U use a bearing protection device to protect the motor to solve the bearing electrical corrosion problem of the variable frequency drive motor or generator, effectively control the shaft voltage and bearing current, and protect the bearing.

[0005] The measures of the above-mentioned existing technical solution are to extend the conductive fiber toward the center of the annular body at one end to the inner side of the dust shield ring to contact the electrically corroded parts of the bearing and conduct the charge away in time to achieve the effect of protecting the bearing. However, there are still the following defects: the end of the conductive fiber is in contact with the electrically corroded part of the bearing. After being put into use for a period of time, the contact end of the conductive fiber will become shorter due to wear, the diversion effect is limited, and it needs to be replaced more frequently. Utility Model Content

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A conductive ring for preventing electrical corrosion of bearings includes a circular outer body and a plurality of conductive fiber bundles arranged in the outer body. The conductive fiber bundles are composed of a plurality of conductive fiber filaments. The conductive fiber bundles have an outer shape of a U-shaped structure including two ends, two corner portions and a bottom. The conductive fiber bundles are distributed in a circle around the center of the outer body, and the opening of each bundle of the conductive fiber bundles faces away from the center of the outer body.

[0008] Furthermore, the outer body is composed of a circular base and cover plates arranged on both sides of the base, and the base is provided with a plurality of installation grooves for installing the conductive fiber bundles.

[0009] Furthermore, the two mounting grooves form a group, and the end of each group of mounting grooves away from the center of the circle is provided with a sink groove for fixing the end of the conductive fiber bundle.

[0010] Furthermore, the ends of the conductive fiber bundles are fixedly connected to the base at the sinks by conductive glue.

[0011] Furthermore, the base body and the cover plate are assembled into the outer body by screw connection or interference fit.

[0012] Furthermore, the conductive fiber bundle includes a long U-shaped first fiber bundle and a short U-shaped second fiber bundle, the first fiber bundle and the second fiber bundle are staggered in the matrix, and the bottom of the first fiber bundle and the bottom of the second fiber bundle are canine-tooth distributed in the matrix.

[0013] Compared with the prior art, the beneficial effects produced by the present invention are:

[0014] 1. The utility model arranges a plurality of circumferentially distributed U-shaped conductive fiber bundles in the outer body. The conductive fiber bundles are composed of a plurality of conductive fiber filaments. The opening of the conductive fiber bundle faces away from the center of the outer body, and the bottom of the U-shape faces the center of the outer body, and contacts the electrically corroded part of the bearing to conduct current. During use, the bottom of the U-shape of the conductive fiber bundle first contacts the motor shaft and is subjected to force. When the motor shaft is in a working state, the bottom of the U-shape of the conductive fiber bundle in contact with the motor shaft is worn and broken first, and the root of the broken part can contact the motor shaft to continue to conduct current, ensuring that the conductive fiber bundle can effectively connect the motor shaft and the metal body of the motor to the greatest extent, extending the service life and reducing the frequency of replacement of the conductive ring.

[0015] 2. The utility model comprises an outer body composed of an annular base and cover plates on both sides. The outer body and a plurality of conductive fiber bundles arranged in the outer body constitute a conductive ring. The ends of the conductive fiber bundles are fixedly connected to the base by conductive glue. The assembly is easy, the operation is simple, and the production efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the main view of the first embodiment of the present invention.

[0017] Figure 2 This is a structural diagram of Example 1 of the present utility model.

[0018] Figure 3 This is an exploded schematic diagram of Example 1 of the present utility model.

[0019] Figure 4 This is a structural diagram of the second embodiment of the present utility model.

[0020] Among them, the numbers in the figure are: outer body 10, base body 11, conductive fiber bundle 12, cover plate 13, installation groove 111, sinking groove 112, first fiber bundle 121, second fiber bundle 122, end portion 1201, corner portion 1202, bottom portion 1203. DETAILED DESCRIPTION

[0021] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0023] Example 1:

[0024] Reference Figure 1 、 Figure 2 and Figure 3 A conductive ring for preventing electrical corrosion in bearings includes an outer body 10 consisting of a circular base 11 and cover plates 13 disposed on either side of the base 11, and multiple identical conductive fiber bundles 12 disposed within the outer body 10. The base 11 and cover plates 13 are assembled to form the outer body 10 by an interference fit or by screwing them together, specifically using countersunk screws or bolts. Both the base 11 and cover plates 13 are made of aluminum alloy, which has excellent electrical conductivity and is relatively inexpensive.

[0025] Reference Figure 2 and Figure 3 The conductive fiber bundle 12 is composed of several small-diameter, wear-resistant conductive fiber filaments (not shown). Each conductive fiber bundle 12 is prefabricated into a U-shape, comprising two ends 1201, two corners 1202, and a bottom 1230. The bottom 1203 faces the center of the base 11. The multiple conductive fiber bundles 12 within the base 11 are distributed circumferentially around the center of the base 11, with the opening of the U-shape facing away from the center of the base 11. The base 11 is provided with mounting grooves 111 for assembling the conductive fiber bundles 12. The mounting grooves 111 are strip-shaped, and two mounting grooves 111 form a group. A recessed groove 112 is defined at the end of the group facing away from the center. The ends 1201 of the conductive fiber bundles 12 are fixedly connected to the base 11 in the recessed groove 112 via conductive adhesive.

[0026] During assembly, the conductive fiber bundle 12 is first installed in the corresponding mounting groove 111. An appropriate amount of conductive adhesive is then used to secure the end 1201 of the conductive fiber bundle 12 to the base 11 at the recess 112. The cover 13 is then closed and assembled using an interference fit or screw connection. Once the conductive adhesive solidifies, a conductive ring is obtained. During use, the conductive ring is secured to the motor shaft using bolts. The bottom 1203 of the conductive fiber bundle 12 contacts the motor shaft, connecting the motor shaft and the motor body. This acts as a channel for the shaft voltage, reducing the shaft voltage between the outer and inner rings of the bearing and thus preventing electrical corrosion of the bearing. In this embodiment, the bottom 1203 of the conductive fiber bundle 12 first contacts the motor shaft. After a period of use, the bottom 1203 of the conductive fiber bundle 12 is first worn off, so that the corner portion 1202 becomes a straight edge. The broken root then contacts the motor shaft, continues to guide the current and plays a role in diverting the shaft voltage, ensuring that the conductive fiber bundle can effectively connect the motor shaft and the motor metal body to the greatest extent, extending the service life and reducing the frequency of replacement of the conductive ring.

[0027] Example 2:

[0028] Reference Figure 4 , this embodiment has basically the same structure as the first embodiment, and will not be described in detail here. The difference is that the conductive fiber bundle 12 of this embodiment includes a long U-shaped first fiber bundle 121 and a short U-shaped second fiber bundle 122. The first fiber bundle 121 and the second fiber bundle 122 are staggered in the outer ring so that the bottoms 1203 of the first fiber bundle 121 and the second fiber bundle 122 are distributed in a canine-like manner in the outer ring. During use, the bottoms 1203 of the first fiber bundle 121 and the second fiber bundle 122 are worn and broken in turn. Specifically, the bottom 1203 of the first fiber bundle 121 first contacts the motor shaft to conduct the shaft voltage. After a period of use, the bottom of the first fiber bundle 121 is worn and broken, and the root of the longer straight edge of the first fiber bundle 121 contacts the motor shaft after the first fiber bundle 121 is broken. The root of the first fiber bundle 121 after the first fiber bundle 121 is gradually shortened during wear, until the bottom 1203 of the second fiber bundle 121 contacts the motor shaft, which together play the role of conducting the shaft voltage and have a longer service life.

[0029] The above is only a specific implementation method of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A conductive ring for preventing electrical corrosion of a bearing, characterized by: The conductive fiber bundle comprises a circular outer body and a plurality of conductive fiber bundles arranged in the outer body, wherein the conductive fiber bundle is composed of a plurality of conductive fiber filaments, and the shape of the conductive fiber bundle is a U-shaped structure including two ends, two corner parts and a bottom. The conductive fiber bundles are distributed in a circle around the center of the outer body, and the opening of each conductive fiber bundle faces the end away from the center of the outer body.

2. The conductive ring for preventing electrical corrosion of bearings according to claim 1, characterized in that: The outer body is composed of a circular base and cover plates arranged on both sides of the base. A plurality of installation grooves for installing conductive fiber bundles are arranged in the base.

3. The conductive ring for preventing electrical corrosion of bearings according to claim 2, characterized in that: The two mounting grooves form a group, and the end of each group of mounting grooves away from the center of the circle is provided with a sink groove for fixing the end of the conductive fiber bundle.

4. The conductive ring for preventing electrical corrosion of bearings according to claim 3, characterized in that: The ends of the conductive fiber bundles are fixedly connected to the base body at the sinks by conductive glue.

5. The conductive ring for preventing electrical corrosion of bearings according to claim 2, characterized in that: The base body and the cover plate are assembled into the outer body by screw connection or interference fit.

6. The conductive ring for preventing electrical corrosion of bearings according to claim 1, characterized in that: The conductive fiber bundle includes a long U-shaped first fiber bundle and a short U-shaped second fiber bundle. The first fiber bundle and the second fiber bundle are staggered in a matrix, and the bottoms of the first fiber bundle and the second fiber bundle are arranged in a canine-like manner in the matrix.

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