Motor bearing anti-electric corrosion device and motor

Abstract

The utility model relates to a motor bearing anticorrosion device and motor, including ring body, conducting fiber bundle, fiber fixed ring, the outside of ring body is provided with the annular recess along the ring body one week, the circumference of ring body is provided with a plurality of mounting holes, and the mounting hole is along the radial penetration of ring body and communicates with annular recess, and the end face of ring body is provided with the joint type cavity, and the joint type cavity communicates with mounting hole, fiber fixed ring sets up in annular recess, and conducting fiber bundle sets up in mounting hole after bending into U type around fiber fixed ring, and U type bottom is around fiber fixed ring, and the open part of U type extends to the radial interior of ring body, the joint element sets up in the joint type cavity, and through the pressure that applies to the joint element, makes the joint element deform after jointing in the joint type cavity and fixes conducting fiber bundle in mounting hole. The utility model can effectively export motor shaft current ground, avoid the shaft current from the motor bearing and make the bearing take place electric corrosion to the protection effect of motor bearing.

Description

Technical Field

[0001] This utility model relates to the field of bearing electro-erosion protection, specifically to a motor bearing anti-electro-erosion 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 bearing 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 device and motor for preventing electro-erosion of motor bearings, thereby solving the problem of electro-erosion of motor bearings.

[0005] According to one aspect of the present invention, an anti-electro-erosion device for motor bearings is provided, comprising a ring body, a conductive fiber bundle, and a fiber fixing ring;

[0006] The outer side of the ring body is provided with an annular recess along the circumference of the ring body, and multiple mounting holes are opened in the circumferential direction of the ring body. The mounting holes penetrate radially along the ring body and communicate with the annular recess. A snap-fit ​​cavity is provided on the end face of the ring body, and the snap-fit ​​cavity communicates with the mounting holes.

[0007] The fiber fixing ring is set in the annular recess, and the conductive fiber bundle is bent into a U-shape around the fiber fixing ring and then set in the mounting hole. The bottom of the U-shape is wrapped around the fiber fixing ring, and the opening of the U-shape extends to the radial interior of the ring body.

[0008] The snap-fit ​​element is disposed in the snap-fit ​​cavity. By applying pressure to the snap-fit ​​element, the snap-fit ​​element is deformed and snapped into the snap-fit ​​cavity, and the conductive fiber bundle is fixed in the mounting hole.

[0009] Preferably, the hardness of the snap-fit ​​element is less than the hardness of the ring.

[0010] Preferably, after the snap-fit ​​element is snapped into the snap-fit ​​cavity, its bottom abuts against the conductive fiber bundle and is located at a position greater than or equal to one-third of the radial direction of the mounting hole.

[0011] Preferably, the snap-fit ​​element is a ball, the snap-fit ​​cavity is a ball hole, and the ball hole is provided on the end face of the ring body corresponding to the mounting hole and communicating with the mounting hole;

[0012] The diameter of the bead before deformation is less than or equal to the diameter of the bead hole.

[0013] Preferably, the bead hole has a chamfer on the end face of the ring body, so that when the bead deforms and is engaged in the bead hole, the top of the bead is flush with the bottom of the chamfer surface.

[0014] Preferably, the snap-fit ​​element is a ring, the snap-fit ​​cavity is an annular groove, and the annular groove is provided on the end face of the ring body corresponding to the mounting hole and communicating with the mounting hole;

[0015] The width of the ring before deformation is less than or equal to the width of the annular groove.

[0016] Preferably, the annular groove has a chamfer on the end face of the ring body, so that when the ring is deformed and engaged in the annular groove, the top of the ring is flush with the bottom of the chamfer surface.

[0017] Preferably, the inner ring of one end of the ring extends inward to form a ring-shaped protective band.

[0018] 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.

[0019] According to another aspect of the present invention, an electric motor is provided, the electric motor including the aforementioned motor bearing anti-electro-erosion device, the motor bearing anti-electro-erosion device being sleeved on the motor shaft, and the conductive fiber bundle abutting radially against the motor shaft.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 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.

[0022] 2. This utility model directly snaps the conductive fiber bundles into the device body through snap-fit ​​elements, without the need for additional fixing devices. The structure is simple, and multiple conductive fiber bundles on the ring body of the mounting body can be fixed at the same time by applying pressure once, without the need to apply pressure to fix them one by one, making it convenient to manufacture.

[0023] 3. This utility model increases the contact area between the snap-fit ​​element and the conductive fiber bundle by applying pressure to the snap-fit ​​element, and at the same time, the snap-fit ​​element is pressed into the installation hole of the conductive fiber bundle to a certain depth, so that the conductive fiber bundle is more firmly fixed and the pull-out force and conductivity are enhanced.

[0024] 4. The conductive fiber bundle of this utility model is pressed by the snap-fit ​​element and anchored by the fiber fixing ring, which eliminates the risk of the conductive fiber bundle falling off. In addition, one conductive fiber bundle is folded around the fiber fixing ring and then folded back to become two conductive fiber bundles, which increases the contact area between the conductive fiber bundle and the ring body. When used on the motor shaft, it also increases the contact area between the conductive fiber bundle and the motor shaft, thus enhancing the conductivity.

[0025] 5. The snap-fit ​​element of this utility model undergoes plastic deformation under force and snaps into the snap-fit ​​cavity of the ring body, thereby achieving the fastening and installation of the conductive fiber bundle; at the same time, the hardness of the snap-fit ​​element is less than that of the ring body, so the deformation of the snap-fit ​​element will not cause the ring body to deform, thus affecting the use and assembly of the ring body.

[0026] 6. This utility model achieves oil, water, and dust protection by setting an annular protective strip on the ring body, 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

[0027] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0028] Figure 2 This is an exploded structural diagram of one embodiment of the present invention;

[0029] Figure 3 This is a partial cross-sectional schematic diagram of one embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of one structure of the ring body of this utility model;

[0031] Figure 5 This is a partial cross-sectional schematic diagram of one structure of the ring body of this utility model;

[0032] Figure 6 This is another structural schematic diagram of the ring body of this utility model;

[0033] Figure 7 This is a schematic diagram of another embodiment of the present invention;

[0034] Figure 8 This is an exploded structural diagram of another embodiment of the present invention;

[0035] Figure 9 This is a partial cross-sectional schematic diagram of another embodiment of the present invention;

[0036] Figure 10 This is another structural schematic diagram of the ring body of this utility model;

[0037] Figure 11This is a partial cross-sectional schematic diagram of another structure of the ring body of this utility model.

[0038] In the figure: 1-Ring body; 2-Conductive fiber bundle; 3-Fiber fixing ring; 4-Annular recess; 5-Mounting hole; 6-Snap-fit ​​element; 61-Ball; 62-Ring; 7-Snap-fit ​​cavity; 71-Ball hole; 72-Annular groove; 8-Chamfer; 81-Bottom end of chamfer surface; 9-Annular protective strip. Detailed Implementation

[0039] 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.

[0040] Example 1:

[0041] A device for preventing electrolytic corrosion of motor bearings, such as Figure 1-11 As shown, the device includes a ring body 1, a conductive fiber bundle 2, and a fiber fixing ring 3. The outer surface of the ring body 1 has an annular recess 4 along its circumference. Multiple mounting holes 5 are formed on the circumference of the ring body 1, extending radially through the ring body 1 and communicating with the annular recess 4. A snap-fit ​​cavity 7 is provided on the end face of the ring body 1, communicating with the mounting holes 5. The fiber fixing ring 3 is disposed within the annular recess 4. The conductive fiber bundle 2 is bent into a U-shape around the fiber fixing ring 3 and then disposed within the mounting holes 5, with the bottom of the U-shape wrapped around the fiber fixing ring 3 and the opening of the U-shape extending radially inward into the ring body 1. A snap-fit ​​element 6 is disposed within the snap-fit ​​cavity 7. By applying pressure to the snap-fit ​​element 6, it deforms and snaps into the snap-fit ​​cavity 7, thus fixing the conductive fiber bundle 2 within the mounting holes 5. The manufacturing process and principle are as follows:

[0042] An annular recess 4 is made on the outer side of the ring body 1, and several radial through holes are made at equal intervals in the circumferential direction of the ring body 1 as mounting holes 5. The mounting holes 5 are connected to the annular recess 4. A snap-fit ​​cavity 7 is made on the end face of the ring body 1 at the position corresponding to the mounting hole 5. The snap-fit ​​cavity 7 is connected to the mounting hole 5.

[0043] Multiple conductive fiber bundles 2 are evenly distributed and bent into a U-shape around a fiber fixing ring 3. The bottom of the U-shape of the conductive fiber bundle 2 is wrapped around the fiber fixing ring 3. At this time, the fiber fixing ring 3 has not yet formed a closed ring and has two unconnected ends. Starting from one end of the fiber fixing ring 3, it is placed in the annular recess 4. During this process, the opening of the U-shape of the conductive fiber bundle 2 is simultaneously inserted into the mounting hole 5. After all the conductive fiber bundles 2 are inserted into the mounting hole 5, the two ends of the fiber fixing ring 3 are connected to form a closed ring. At this time, the fiber fixing ring 3 is placed in the annular recess 4, and the conductive fiber bundles 2 wrapped around it are placed in the mounting hole 5. The opening of the U-shape of the conductive fiber bundle 2 extends to the radial interior of the ring body 1.

[0044] Place the snap-fit ​​element 6 into the snap-fit ​​cavity 7, and then apply pressure to the snap-fit ​​element 6 to move the snap-fit ​​element 6 toward the conductive fiber bundle 2 and squeeze the conductive fiber bundle 2. At the same time, the snap-fit ​​element 6 is deformed by the pressure, especially expanding perpendicular to the direction of force. After the size increases, it snaps into the snap-fit ​​cavity 7. At this time, the bottom of the snap-fit ​​element 6 abuts against the conductive fiber bundle 2 and is located inside the mounting hole 5.

[0045] When subjected to force, the snap-fit ​​element 6 abuts against the conductive fiber bundle 2 on one hand, and deforms and snaps into the snap-fit ​​cavity 7 on the other, thereby achieving a tight installation of the conductive fiber bundle 2, increasing the tensile strength of the conductive fiber bundle 2, and squeezing out the air between the conductive fiber bundle 2, the ring body 1, and the snap-fit ​​element 6, increasing the contact area, reducing the contact resistance, and increasing the conductivity. After the snap-fit ​​element 6 is snapped into the snap-fit ​​cavity 7, the surface of the snap-fit ​​element 6 will not exceed the surface of the ring body 1. The conductive fiber bundle 2 is pressed by the snap-fit ​​element 6 and anchored by the fiber fixing ring 3, eliminating the risk of the conductive fiber bundle 2 falling off. In addition, one bundle of conductive fiber 2 is folded around the fiber fixing ring 3 and then folded back into two bundles of conductive fiber 2, increasing the contact area between the conductive fiber bundle 2 and the ring body 1, and also increasing the contact area between the conductive fiber bundle 2 and the motor shaft when used on the motor shaft, thus enhancing the conductivity.

[0046] Regarding material selection, the ring body 1 can use various conductive materials such as aluminum alloy, copper alloy, or silver alloy; the conductive fiber bundle 2 can use materials such as metal-based conductive fibers, carbon black-based conductive fibers, metal compound-type conductive fibers, or conductive polymer-type fibers; the snap-fit ​​element 6 can use various malleable metal or non-metal materials. The fiber fixing ring 3 is made of malleable metal or non-metal materials.

[0047] In a preferred embodiment, the hardness of the snap-fit ​​element 6 is less than that of the ring body 1, so that deformation of the snap-fit ​​element 6 under stress will not cause deformation of the ring body 1, thereby affecting the use and assembly of the ring body 1. As an assembly functional component, such as an equipment functional component assembled onto a motor, the outer diameter and thickness of the ring body 1 are crucial. If these critical dimensions are deformed, it will affect the actual assembly and use.

[0048] In another preferred embodiment, after the snap-fit ​​element 6 snaps into the snap-fit ​​cavity 7, its bottom abuts against the conductive fiber bundle 2 and is located at a position greater than or equal to one-third of the radial direction of the mounting hole 5. This makes the contact between the snap-fit ​​element 6 and the conductive fiber bundle 2 more secure, enhancing the pull-out force and conductivity. A chamfer 8 is provided on the snap-fit ​​cavity 7, and the bottom end 81 of the chamfer surface indicates the termination position of the applied pressure. At this time, the snap-fit ​​element 6 moves to a position greater than or equal to one-third of the radial direction of the mounting hole 5 and abuts against the conductive fiber bundle 2. After the snap-fit ​​element 6 expands under force, it snaps into the snap-fit ​​cavity 7.

[0049] Example 2:

[0050] This embodiment is an improvement based on Embodiment 1, specifically the following improvements: Figure 7-11 As shown, the snap-fit ​​element 6 is a ball 61, and the snap-fit ​​cavity 7 is a ball hole 71. The ball hole 71 is provided on the end face of the ring body 1 corresponding to the mounting hole 5 and communicating with the mounting hole 5.

[0051] A bead hole 71 is made on the end face of the ring 1 at the position corresponding to the mounting hole 5. The bead hole 71 corresponds one-to-one with the mounting hole 5 and is connected to the mounting hole 5. The bead 61 is placed in the bead hole 71, and then all pressure is applied to the bead 61 at the same time, so that the bead 61 moves towards the conductive fiber bundle 2 placed in the mounting hole 5 and squeezes the conductive fiber bundle 2. At the same time, the bead 61 is deformed by the pressure, especially expanding perpendicular to the direction of force. After the size increases, it is stuck in the bead hole 71. At this time, the bottom of the bead 61 abuts against the conductive fiber bundle 2 and is located inside the mounting hole 5.

[0052] The advantage of using a ball 61 in the snap-fit ​​element 6 is that when placing the ball 61 into the ball hole 71 on the end face of the ring body 1, it is not necessary to place the ball 61 into multiple ball holes 71 one by one. Multiple balls 61 can be released onto the end face of the ring body 1 at once, and then the ball 61 will automatically roll into the ball hole 71 through vibration, making the assembly and preparation simple and quick.

[0053] In order to facilitate the placement of the bead 61 into the bead hole 71, in a preferred embodiment, the diameter of the bead 61 before deformation is less than or equal to the diameter of the bead hole 71. In order to ensure that the bead 61 can be tightly fitted into the bead hole 71 after deformation, the diameter of the bead 61 before deformation is slightly smaller than the diameter of the bead hole 71. For example, the diameter of the bead 61 before deformation is 0-3mm smaller than the diameter of the bead hole 71.

[0054] To facilitate knowing the endpoint of the applied pressure and for processing purposes, in the preferred embodiment, such as... Figure 9 As shown, the bead hole 71 is provided with a chamfer 8 on the end face of the ring body 1. When the bead 61 deforms and is engaged in the bead hole 71, the top of the bead 61 is flush with the bottom end 81 of the chamfer surface. That is to say, when pressure is applied to move the top of the bead 61 to the bottom end of the chamfer surface 8, the bottom of the bead 61 is located at more than one-third of the radial direction of the mounting hole 5 and abuts against the conductive fiber bundle 2. The bead 61 deforms and expands under pressure, which can be tightly engaged in the bead hole 71, thereby realizing the tight mounting of the conductive fiber bundle 2 on the ring body 1.

[0055] Example 3:

[0056] This embodiment is an improvement based on Embodiment 1, specifically the following improvements: Figure 1-6 As shown, the snap-fit ​​element 6 is a ring 62, and the snap-fit ​​cavity 7 is an annular groove 72. The annular groove 72 is provided on the end face of the ring body 1 corresponding to the mounting hole 5 and communicating with the mounting hole 5.

[0057] An annular groove 72 is made coaxially with the ring body 1 at the position corresponding to the mounting hole 5 on the end face of the ring body 1. The annular groove 72 is connected to the mounting hole 5. The ring 62 is placed in the annular groove 72, and then pressure is applied to the ring 62 to make the ring 62 move towards the conductive fiber bundle 2 placed in the mounting hole 5 and squeeze the conductive fiber bundle 2. At the same time, the ring 62 is deformed by the pressure, especially expanding perpendicular to the direction of force. After the size increases, it is stuck in the annular groove 72. At this time, the bottom of the ring 62 abuts against the conductive fiber bundle 2 and is located inside the mounting hole 5.

[0058] The advantage of using a ring 62 for the snap-fit ​​element 6 is that multiple conductive fiber bundles 2 can be crimped and fixed at one time through the ring 62, making the processing convenient and efficient.

[0059] To facilitate the placement of the ring 62 within the annular groove 72, in a preferred embodiment, such as... Figure 3 , 5As shown, the width of the ring 62 before deformation is less than or equal to the width of the annular groove 72. To facilitate knowing the endpoint of the applied pressure and for ease of processing, in a preferred embodiment, the annular groove 72 is provided with a chamfer 8 on the end face of the ring body 1. When the ring 62 deforms and engages in the annular groove 72, the top of the ring 62 is flush with the bottom end 81 of the chamfer surface. That is to say, when pressure is applied to move the top of the ring 62 to the bottom end of the chamfer surface 8, the bottom of the ring 62 is exactly located at a point greater than or equal to one-third of the radial direction of the mounting hole 5 and abuts against the conductive fiber bundle 2. The ring 62 deforms and expands under pressure, which can securely engage in the annular groove 72, thereby securing the conductive fiber bundle 2 to the ring body 1.

[0060] Example 4:

[0061] This embodiment is an improvement based on Embodiment 1, 2, or 3, specifically in that: Figure 6 , Figure 7 , Figure 10 and Figure 11 As shown, the inner ring of the ring body 1 at one end extends inward to form an annular protective strip 9; the distance inwardly extending of the inner ring of the ring body 1 is less than the distance the conductive fiber bundle 2 extends into the interior of the ring body 1, that is, the width of the annular protective strip 9 along the radial direction of the ring body 1 is less than the distance the conductive fiber bundle 2 extends into the interior of the ring body 1.

[0062] By setting an annular protective strip 9 on the ring body 1, oil, water, and dust are blocked, protecting the conductive fiber bundle 2 from intrusion by oil, water, or dust, which would hinder the conductive fiber bundle 2 from making contact with conductivity. The radial width of the annular protective strip 9 along the ring body 1 is less than the distance the conductive fiber bundle 2 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.

[0063] Example 5:

[0064] An electric motor includes the aforementioned anti-electro-corrosion device for motor bearings, wherein the anti-electro-corrosion device is sleeved on the motor shaft, and the conductive fiber bundle 2 abuts radially against the motor shaft to conduct the motor shaft current and prevent electro-corrosion of the motor bearing.

[0065] 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.

[0066] 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.

[0067] 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 device for preventing electrolytic corrosion of motor bearings, characterized in that, Includes a ring body, conductive fiber bundles, fiber retaining rings, and snap-fit ​​elements; The outer side of the ring body is provided with an annular recess along the circumference of the ring body, and multiple mounting holes are opened in the circumferential direction of the ring body. The mounting holes penetrate radially along the ring body and communicate with the annular recess. A snap-fit ​​cavity is provided on the end face of the ring body, and the snap-fit ​​cavity communicates with the mounting holes. The fiber fixing ring is set in the annular recess, and the conductive fiber bundle is bent into a U-shape around the fiber fixing ring and then set in the mounting hole. The bottom of the U-shape is wrapped around the fiber fixing ring, and the opening of the U-shape extends to the radial interior of the ring body. The snap-fit ​​element is disposed in the snap-fit ​​cavity. By applying pressure to the snap-fit ​​element, the snap-fit ​​element is deformed and snapped into the snap-fit ​​cavity, and the conductive fiber bundle is fixed in the mounting hole.

2. The anti-electrolytic corrosion device for motor bearings according to claim 1, characterized in that, The hardness of the snap-fit ​​element is less than the hardness of the ring.

3. The anti-electrolytic corrosion device for motor bearings according to claim 1, characterized in that, After the snap-fit ​​element snaps into the snap-fit ​​cavity, its bottom abuts against the conductive fiber bundle and is located at a position greater than or equal to one-third of the radial direction of the mounting hole.

4. The anti-electrolytic corrosion device for motor bearings according to claim 1, characterized in that, The snap-fit ​​element is a ball, and the snap-fit ​​cavity is a ball hole. The ball hole is set on the end face of the ring body corresponding to the mounting hole and communicating with the mounting hole. The diameter of the bead before deformation is less than or equal to the diameter of the bead hole.

5. The anti-electrolytic corrosion device for motor bearings according to claim 4, characterized in that, The bead hole has a chamfer on the end face of the ring body. When the bead deforms and is engaged in the bead hole, the top of the bead is flush with the bottom of the chamfer surface.

6. The anti-electrolytic corrosion device for motor bearings according to claim 1, characterized in that, The snap-fit ​​element is a ring, and the snap-fit ​​cavity is an annular groove. The annular groove is provided on the end face of the ring body in correspondence with the mounting hole and communicates with the mounting hole. The width of the ring before deformation is less than or equal to the width of the annular groove.

7. The anti-electrolytic corrosion device for motor bearings according to claim 6, characterized in that, The annular groove has a chamfer on the end face of the ring body. When the ring is deformed and engaged in the annular groove, the top of the ring is flush with the bottom of the chamfer surface.

8. The anti-electrolytic corrosion device for motor bearings according to claim 1, characterized in that, The inner ring of one end of the ring extends inward to form a ring-shaped protective band.

9. The anti-electrolytic corrosion device for motor bearings according to claim 8, characterized in that, The distance the inner ring extends inward is less than the distance the conductive fiber bundle extends into the inner ring.

10. An electric motor, characterized in that, The motor includes the motor bearing anti-electro-erosion device according to any one of claims 1-9, wherein the motor bearing anti-electro-erosion device is sleeved on the motor shaft, and the conductive fiber bundle abuts radially against the motor shaft.

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