Motor shaft grounding device and motor

Abstract

The utility model relates to a motor shaft grounding device and motor, including ring body, end cover, conducting fiber bundle, fiber fixed ring, be provided with annular recess on the ring body and / or end cover, and the annular recess forms the installation space at ring body and end cover connection, fiber fixed ring sets up in the installation space, conducting fiber bundle is bent into U type around fiber fixed ring, and the U type bottom is around fiber fixed ring, and the opening portion of U type extends to the inside of ring body, the ring body is connected with end cover and will conducting fiber bundle clamp tightly install, the utility model can effectively export motor shaft current and ground, avoid the shaft current from the motor bearing and make the bearing take place electric corrosion, and the protection effect is played to the motor bearing.

Description

Technical Field

[0001] This utility model relates to the field of bearing electrolytic corrosion protection, specifically to a motor shaft grounding device and a motor. Background Technology

[0002] In recent years, the new energy sector has developed rapidly, and the application of variable frequency motors has become increasingly widespread. With the continuous increase in motor power, the higher voltage platform often leads to higher shaft voltage. Furthermore, to adapt to high speeds, the viscosity of lubricating oil / grease decreases, resulting in a thinner oil film and poorer load-bearing capacity. Therefore, bearing electro-corrosion problems have become prominent in the past two years. Bearing electro-corrosion in motors is a key concern for OEMs recently.

[0003] To protect bearings and prevent electrolytic corrosion, it is necessary to discharge the shaft current, leakage current, and fault-induced current generated during the operation of the drive motor. In existing technologies, shaft current discharge devices mostly use fiber bundles to fix conductive fibers and then install them on conductive rings, which is relatively complex in structure and manufacturing process. Utility Model Content

[0004] The purpose of this utility model is to provide a motor shaft grounding device and a motor to solve the problem of electrical corrosion of motor bearings.

[0005] According to one aspect of the present invention, a motor shaft grounding device is provided, comprising a ring body, an end cap, a conductive fiber bundle, and a fiber fixing ring;

[0006] An annular groove is provided on the ring body and / or end cap. After the ring body and end cap are connected, an installation space is formed at the annular groove, and the fiber fixing ring is set in the installation space.

[0007] The conductive fiber bundle is bent into a U-shape around the fiber fixing ring, with the bottom of the U-shape wrapped around the fiber fixing ring and the opening of the U-shape extending into the ring body;

[0008] After the ring body is connected to the end cap, the conductive fiber bundle is clamped and installed.

[0009] Preferably, the end cap is annular, and the end cap is coaxially arranged with the ring body. The end cap is pressed onto the ring body by pressure, and the outer ring of the end cap is installed with an interference fit with the ring body.

[0010] Preferably, the plurality of conductive fiber bundles are evenly distributed circumferentially along the fiber fixing ring.

[0011] Preferably, the ring body is provided with a plurality of uniformly distributed fiber positioning grooves in the circumferential direction, and the fiber positioning grooves extend radially along the ring body.

[0012] Preferably, the conductive fiber bundles are arranged closely along the fiber fixing ring to form a fiber ring.

[0013] Preferably, the inner ring of the ring body on the side away from the end cap extends inward to form a ring-shaped protective band;

[0014] Alternatively, the inner ring of the end cap on the side away from the ring body may extend inward to form a ring-shaped protective band.

[0015] Preferably, the distance by which the inner ring extends inward is less than the distance by which the conductive fiber bundle extends into the inner ring.

[0016] Preferably, the distance by which the inner ring of the end cap extends inward is less than the distance by which the conductive fiber bundle extends into the body of the ring.

[0017] Preferably, the ring body and end cap are made of aluminum alloy, copper alloy or silver alloy;

[0018] The conductive fiber bundle is made of metal-based conductive fibers, carbon black-based conductive fibers, metal compound-type conductive fibers, or conductive polymer fibers.

[0019] The fiber retaining ring is made of a malleable metal or non-metal material.

[0020] According to another aspect of the present invention, an electric motor is provided, the electric motor including the aforementioned motor shaft grounding device, the motor shaft grounding device being sleeved on the motor shaft, and the conductive fiber bundle abutting radially against the motor shaft.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This utility model can effectively conduct the motor shaft current to ground, prevent the shaft current from flowing out of the motor bearing and causing electrical corrosion of the bearing, and play a protective role for the motor bearing.

[0023] 2. This utility model has a simple structure. It only requires processing an annular groove on the ring body or end cap. No additional processing is required. The conductive fiber bundle is clamped and installed by pressing the end cap onto the ring body in one go. The processing cost is lower and the efficiency is higher.

[0024] 3. This utility model installs the conductive fiber bundle within the mounting space formed by wrapping it around the fiber fixing ring and then fixing it in the annular groove. The conductive fiber bundle is clamped by the ring body and the end cap and anchored by the fiber fixing ring, eliminating the risk of the conductive fiber bundle falling off. In addition, one conductive fiber bundle is folded back after wrapping around the fiber fixing ring to become two conductive fiber bundles, which increases the contact area between the conductive fiber bundle and the ring body, and also increases the contact area between the conductive fiber bundle and the motor shaft when used on the motor shaft, thus enhancing the conductivity.

[0025] 4. This utility model achieves oil, water, and dust protection by setting an annular protective strip on the ring body or end cap, protecting the conductive fiber bundle and preventing it from being invaded by oil, water, or dust, thus hindering the conductive fiber bundle from contacting and conducting electricity. Attached Figure Description

[0026] Figure 1 This is an exploded structural diagram of one embodiment of the present invention;

[0027] Figure 2 This is a three-dimensional structural schematic diagram of one embodiment of the present utility model;

[0028] Figure 3 This is a partial cross-sectional schematic diagram of one embodiment of the present invention;

[0029] Figure 4 This is an exploded structural diagram of another embodiment of the present invention;

[0030] Figure 5 This is an exploded structural diagram of another embodiment of the present invention;

[0031] Figure 6 This is a partial cross-sectional schematic diagram of one embodiment of the ring body of this utility model;

[0032] Figure 7 This is a partial cross-sectional schematic diagram of one embodiment of the end cap of this utility model.

[0033] In the diagram: 1-Ring body; 2-End cap; 3-Conductive fiber bundle; 4-Fiber fixing ring; 5-Annular groove; 6-Installation space; 7-Fiber positioning groove; 8-Annular protective strip; 9-Fiber ring. Detailed Implementation

[0034] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0035] Example 1:

[0036] A motor shaft grounding device, such as Figure 1-3As shown, the device includes a ring body 1, an end cap 2, a conductive fiber bundle 3, and a fiber fixing ring 4. The ring body 1 and / or the end cap 2 are provided with an annular groove 5. After the ring body 1 and the end cap 2 are connected, an installation space 6 is formed at the annular groove 5, and the fiber fixing ring 4 is disposed within the installation space 6. The conductive fiber bundle 3 is bent into a U-shape around the fiber fixing ring 4, with the bottom of the U-shape wrapped around the fiber fixing ring 4, and the opening of the U-shape extending into the interior of the ring body 1. After the ring body 1 is connected to the end cap 2, the conductive fiber bundle 3 is clamped and installed. The end cap 2 is annular, coaxially arranged with the ring body 1, and is pressed onto the ring body 1 by pressure. The outer ring of the end cap 2 is interference-fitted with the ring body 1.

[0037] Preparation method: On one end face of the ring body 1 and / or one side of the end cap 2, an annular groove 5 is machined to fill the conductive fiber bundle 3 and the fiber fixing ring 4. The annular groove 5 is coaxially arranged with the ring body 1. The other side of the ring body 1 and the other side of the end cap 2 do not need to be machined. During installation, the conductive fiber bundle 3 is placed in the annular groove 5, wrapped around the fiber fixing ring 4. The conductive fiber bundle 3 is bent into a U-shape around the fiber fixing ring 4, with the bottom of the U-shape wrapped around the fiber fixing ring 4 and the opening of the U-shape extending into the inside of the ring body 1. Then, the end cap 2 is pressed and fixed onto the ring body 1 with an interference fit, so that the other side of the end cap 2 is flush with the end face of the ring body 1, thereby pressing the conductive fiber bundle 3 to achieve the purpose of fastening the conductive fiber bundle 3.

[0038] This invention only requires machining the annular groove 5 on the ring body 1 or the end cap 2, without any additional machining. The conductive fiber bundle 3 is clamped and installed by pressing the end cap 2 onto the ring body 1 in one go, eliminating the need for multiple pressing operations on multiple conductive fiber bundles 3 as required by traditional conductive ring structures. This results in lower processing costs and higher efficiency. By winding the conductive fiber bundle 3 around the fiber fixing ring 4 and installing it within the installation space 6 formed by the annular groove 5, the conductive fiber bundle 3 is clamped by the ring body 1 and the end cap 2 while being anchored by the fiber fixing ring 4, eliminating the risk of the conductive fiber bundle 3 falling off. Furthermore, when one conductive fiber bundle 3 is folded back after wrapping around the fiber fixing ring 4, it becomes two conductive fiber bundles 3, increasing the contact area between the conductive fiber bundle 3 and the ring body 1, and also increasing the contact area between the conductive fiber bundle 3 and the motor shaft when used on a motor shaft, thus enhancing conductivity.

[0039] Regarding material selection, the ring body 1 and end cap 2 are made of aluminum alloy, copper alloy, or silver alloy. The conductive fiber bundle 3 is made of metal-based conductive fiber, carbon black-based conductive fiber, metal compound type conductive fiber, or conductive polymer type fiber. The fiber fixing ring 4 is made of a malleable metal or non-metal material.

[0040] Example 2:

[0041] This embodiment is an improvement based on Embodiment 1, specifically the following improvements: Figure 4As shown, the plurality of conductive fiber bundles 3 are evenly distributed around the fiber fixing ring 4; the ring body 1 is provided with a plurality of evenly distributed fiber positioning grooves 7, which extend radially along the ring body 1.

[0042] In order to ensure that multiple conductive fiber bundles 3 can be evenly distributed around the circumference of the ring body 1 after being installed on the ring body 1, the multiple conductive fiber bundles 3 are folded around the circumference of the fiber fixing ring 4 at equal intervals. Then, multiple evenly distributed fiber positioning grooves 7 are set around the circumference of the ring body 1 to assist in the installation and positioning of the conductive fiber bundles 3. The setting of fiber positioning grooves 7 can also prevent the conductive fiber bundles 3 from shifting during the process of pressing the end cap 2 onto the ring body 1. This can better secure the installation of the conductive fiber bundles 3 and make the conductive fiber bundles 3 face the inside of the ring body 1 and be evenly distributed on the ring body 1 at equal intervals.

[0043] Example 3:

[0044] This embodiment is an improvement based on Embodiment 1, specifically the following improvements: Figure 5 As shown, the conductive fiber bundles are tightly arranged along the fiber fixing ring to form a fiber ring 9. This results in more conductive fiber bundles 3 contacting the motor shaft when mounted on it, and the motor shaft is connected to the fiber ring 9 around its circumference, improving conductivity.

[0045] Example 4:

[0046] This embodiment is an improvement based on Embodiment 1, 2, or 3, specifically in that: Figure 6 , 7 As shown, the inner ring of the ring body 1 on the side away from the end cap 2 extends inward to form an annular protective band 8; or the inner ring of the end cap 2 on the side away from the ring body 1 extends inward to form an annular protective band 8. The distance by which the inner ring of the ring body 1 extends inward is less than the distance by which the conductive fiber bundle 3 extends into the ring body 1; the distance by which the inner ring of the end cap 2 extends inward is less than the distance by which the conductive fiber bundle 3 extends into the ring body 1; that is, the width of the annular protective band 8 along the radial direction of the ring body 1 is less than the distance by which the conductive fiber bundle 3 extends into the ring body 1.

[0047] By setting an annular protective strip 8 on the ring body 1 or end cap 2, oil, water, and dust are blocked, protecting the conductive fiber bundle 3 from intrusion by oil, water, or dust, which would hinder the conductive fiber bundle 3 from making contact with conductivity. The radial width of the annular protective strip 8 along the ring body 1 is less than the distance the conductive fiber bundle 3 extends into the ring body 1, so as not to interfere with the motor shaft after the motor shaft grounding device is installed on the motor shaft.

[0048] Example 5:

[0049] An electric motor includes the aforementioned motor shaft grounding device, which is sleeved on the motor shaft. The conductive fiber bundle 3 radially abuts against the motor shaft to conduct the motor shaft current and prevent the motor bearing from undergoing electro-corrosion.

[0050] In this utility model, the use of directional terms such as "upper," "lower," "left," "right," "bottom," and "top" is defined relative to the directions shown in the accompanying drawings and is used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. These or other directional terms should not be construed as restrictive terms.

[0051] Furthermore, this utility model does not discuss in detail the technologies and equipment known to those skilled in the art, but where appropriate, such technologies and equipment should be considered part of the specification.

[0052] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A motor shaft grounding device, characterized in that, Includes ring body, end cap, conductive fiber bundle, and fiber retaining ring; An annular groove is provided on the ring body and / or end cap. After the ring body and end cap are connected, an installation space is formed at the annular groove, and the fiber fixing ring is set in the installation space. The conductive fiber bundle is bent into a U-shape around the fiber fixing ring, with the bottom of the U-shape wrapped around the fiber fixing ring and the opening of the U-shape extending into the ring body; After the ring body is connected to the end cap, the conductive fiber bundle is clamped and installed.

2. The motor shaft grounding device according to claim 1, characterized in that, The end cap is annular and coaxially arranged with the ring body. The end cap is pressed onto the ring body by pressure, and the outer ring of the end cap is installed with an interference fit with the ring body.

3. The motor shaft grounding device according to claim 1, characterized in that, The plurality of conductive fiber bundles are evenly distributed along the circumferential direction of the fiber fixing ring.

4. The motor shaft grounding device according to claim 1 or 3, characterized in that, The ring body has multiple evenly distributed fiber positioning grooves on its circumference, and the fiber positioning grooves extend radially along the ring body.

5. The motor shaft grounding device according to claim 1, characterized in that, The conductive fiber bundles are arranged closely along the fiber fixing ring to form a fiber ring.

6. The motor shaft grounding device according to claim 1, characterized in that, The inner ring of the ring body on the side away from the end cap extends inward to form a ring-shaped protective band. Alternatively, the inner ring of the end cap on the side away from the ring body may extend inward to form a ring-shaped protective band.

7. The motor shaft grounding device according to claim 6, characterized in that, The distance the inner ring extends inward is less than the distance the conductive fiber bundle extends into the inner ring.

8. The motor shaft grounding device according to claim 6, characterized in that, The distance by which the inner ring of the end cap extends inward is less than the distance by which the conductive fiber bundle extends into the body of the ring.

9. The motor shaft grounding device according to claim 1, characterized in that, The ring body and end cap are made of aluminum alloy, copper alloy or silver alloy; The conductive fiber bundle is made of metal-based conductive fibers, carbon black-based conductive fibers, metal compound-type conductive fibers, or conductive polymer fibers. The fiber retaining ring is made of a malleable metal or non-metal material.

10. An electric motor, characterized in that, The motor includes the motor shaft grounding device as described in any one of claims 1-9, wherein the motor shaft grounding device is sleeved on the motor shaft, and the conductive fiber bundle abuts radially against the motor shaft.

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